阅读说明：本技术 一种启闭机排架从下部拆除的破碎锤拆除施工方法 (Breaking hammer dismantling construction method for dismantling hoist bent from lower part ) 是由 王军 郭攀峰 雷子祥 符学鑫 吴兴鹏 李鑫斌 陈棚 宋福安 张晓伟 郭伟 陈清显 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种启闭机排架从下部拆除的破碎锤拆除施工方法,包括以下步骤：一、闸孔及启闭机室起吊孔的封堵防护；二、对待拆除排架周围进行安全防护；三、启闭机平台上部结构的拆除；四、启闭机排架拆除用作业平台的修建；五、降低启闭机平台至破碎锤的作业高度范围；六、启闭机平台的拆除；七、废渣的清理及运输。本发明施工便捷,通过将启闭机平台的上部结构进行预先拆除,然后通过破碎锤将启闭机平台下部的钢筋混凝土排架单元进行分段拆除,降低启闭机平台至破碎锤作业高度范围后,采用破碎锤对启闭机平台进行整体破碎拆除,整个施工过程不受场地限制,使用设备少,对施工人员危害小,工法环保性高,能有效提高施工效率,缩减施工成本。(The invention discloses a breaking hammer dismantling construction method for dismantling a headstock gear bent from the lower part, which comprises the following steps: firstly, plugging and protecting a brake hole and a hoisting hole of an opening and closing machine room; secondly, carrying out safety protection on the periphery of the bent to be dismantled; thirdly, dismantling the upper structure of the hoist platform; fourthly, building an operation platform for dismantling the headstock bent; fifthly, reducing the range of the operation height from the hoist platform to the breaking hammer; sixth, dismantling the hoist platform; and seventhly, cleaning and transporting waste residues. The construction method is convenient and fast to construct, the upper structure of the hoist platform is dismantled in advance, then the reinforced concrete bent frame unit at the lower part of the hoist platform is dismantled in sections through the breaking hammer, and after the hoist platform is lowered to the working height range of the breaking hammer, the whole hoist platform is dismantled in a breaking mode through the breaking hammer, the whole construction process is not limited by a field, few devices are used, harm to constructors is small, the environment-friendly performance of the construction method is high, the construction efficiency can be effectively improved, and the construction cost is reduced.)

1. A construction method for dismantling a breaking hammer of a hoist bent from the lower part comprises the steps that the hoist bent comprises a plurality of reinforced concrete bent units which are arranged along the extending direction of an arch dam (1) and used for supporting hoist rooms (6), the number of the hoist rooms (6) is two, each hoist room (6) comprises a plurality of operating rooms (6-1) which are arranged along the extending direction of the arch dam (1) and are communicated with each other, the lower part of each operating room (6-1) supports one reinforced concrete bent unit, a ring beam (8) is arranged between an operating platform (6-2) at the bottom of the operating room (6-1) and the top of each reinforced concrete bent unit, a plurality of gate holes (2) are formed in the arch dam (1), a plurality of lifting holes (7) which are matched with the gate holes (2) are formed in the operating platform (6-2), a reinforced concrete stair (3) is arranged between the two hoist chambers (6), the reinforced concrete bent frame unit comprises two upright post supporting mechanisms arranged along the extension direction of the arch dam (1), each upright post supporting mechanism comprises two supporting upright posts (4) arranged along the width direction of the arch dam (1), and the middle parts of the two supporting upright posts (4) in the upright post supporting mechanisms are connected with a connecting beam (5);

the method is characterized by comprising the following steps:

step one, plugging and protecting a brake hole and a hoisting hole of an opening and closing machine room, and the process is as follows:

step 101, plugging the apertures of the gate holes, wherein a protection system is erected at the top of the arch dam (1) to plug and protect the apertures of the gate holes (2), the protection system comprises a plurality of I-shaped steels, plugging steel plates are laid on the upper portions of the I-shaped steels, and the aperture plugging protection process of each gate hole (2) is as follows:

step 1011, dismantling the gate hole orifice guard rail: a circle of protective railings are arranged at the orifice of the gate hole (2) along the circumferential direction of the orifice, and before plugging and protecting the orifice of the gate hole (2), constructors manually remove the protective railings and transport the protective railings to the outer side of the gate hoist bent;

step 1012, laying I-shaped steel at the orifice of the brake hole: analyzing the stress condition of a protection system according to the structural size and the material of a gate frame, determining the types and the intervals of a plurality of I-beams, arranging a plurality of I-beams at the orifice of a gate hole (2) at equal intervals along the extension direction of an arch dam (1), respectively erecting the two ends of each I-beam on the arch dam (1) at the two sides of the gate hole (2), and laying plugging steel plates on the upper parts of the laid I-beams to firmly connect the I-beams into a whole;

102, plugging a hoisting hole of an headstock gear chamber: paving a pavement board at the position of a lifting hole (7) of the hoist platform to plug the lifting hole (7);

step two, carrying out safety protection around the bent to be dismantled, wherein the process is as follows:

step 201, erection of a protection frame body: erecting a double-row scaffold on one side of the hoist bent to form a protection frame body, wherein the protection frame body is erected on the downstream side of the arch dam (1) from left to right along the extension direction of the arch dam (1);

step 202, sealing the protective frame body;

step three, dismantling the upper structure of the hoist platform, which comprises the following steps:

step 301, dismantling equipment inside the hoist chamber: dismantling the steel wire rope and the winch in the hoist chamber (6), disassembling the hoist in the hoist chamber (6), and lowering the dismantled steel wire rope, the winch and the hoist to the arch dam (1) at the lower part of the hoist chamber (6);

step 302, dismantling doors and windows of the hoist chamber: manually removing all doors and windows on the hoist chamber (6), and lowering the removed doors and windows to the top of the arch dam (1);

step 303, dismantling a top plate and a side wall of the hoist chamber: a pneumatic pick is adopted to remove the top plate and the side wall of the hoist chamber, the top plate and the side wall of the hoist chamber are sequentially removed according to the sequence of firstly removing the wall body and then removing the beam column, a chute is erected at a lifting hole (7) to be supported between the top of the arch dam (1) and an operation platform (6-2), and the removed waste residues are placed at the top of the arch dam (1) through the chute;

step four, the hoist bent is dismantled and is used the construction of operation platform: adopting a small-sized back shovel to shovel the waste residues removed in the step 303 on the top of the arch dam (1) to form a hoist bent removal service platform, wherein all bent units are positioned above the hoist bent removal service platform;

step five, reducing the range of the operating height from a hoist platform to the breaking hammer, wherein the hoist platform is a bottom plate of a hoist chamber (6) and is formed by sequentially connecting a plurality of operating platforms (6-2), the heights of the operating platforms (6-2) are sequentially reduced to reduce the whole hoist platform to the range of the operating height of the breaking hammer, sections, located between a connecting beam (5) and a ring beam (8), in a reinforced concrete bent frame unit are broken and removed, and the operating platforms (6-2) are reduced to the operating height of the breaking hammer;

four in the reinforced concrete bent unit the section that lies in between tie beam (5) and circle roof beam (8) on support post (4) all is by lower supreme a plurality of concrete chisel sections of divideing, and the height that every concrete chisel removed the section is 10cm ~ 35cm, when breaking the section that lies in between tie beam (5) and circle roof beam (8) in each reinforced concrete bent unit and demolish, the reinforced concrete bent unit between tie beam (5) and circle roof beam (8) is demolishd by lower supreme multistage bent structure in proper order according to a plurality of concrete chisel sections, and the process of demolising of every section bent structure is as follows:

step 501, reducing the height of a first upright post supporting mechanism in a reinforced concrete bent unit, wherein one upright post supporting mechanism positioned on the inner side of the reinforced concrete bent unit is the first upright post supporting mechanism, and the process is as follows:

step 5011, chiseling the concrete of the support column at the downstream side of the first column support mechanism: utilizing a 240-type breaking hammer to lengthen a drill rod on the operation platform for dismantling the headstock creel built in the fourth step, chiseling concrete in a concrete chiseling section close to the upper side of the connecting beam (5) on the support upright (4) at the downstream side of the first upright support mechanism, and temporarily utilizing structural steel bars of the support upright (4) to bear the load;

step 5012, chiseling the concrete of the support upright column at the upstream side of the first upright column support mechanism: regarding the upstream side support column (4) of the first column support mechanism as the downstream side support column (4), repeating the step 5011, and chiseling the concrete in a concrete chiseling section on the upper side of the connecting beam (5) on the upstream side support column (4) of the first column support mechanism;

step 5013, inclining the operating platform: knocking the side parts of the exposed structural steel bars in the concrete chiseling section of chiseling concrete on two supporting columns (4) in the first column supporting mechanism by using a hammer head, bending the structural steel bars of the concrete chiseling section towards the inner side of the arch dam (1) and cutting the structural steel bars from the upper parts of the supporting columns (4), wherein one side of an operation platform (6-2) above the reinforced concrete bent frame unit, which is close to the first column supporting mechanism, is downwards inclined;

step 502, lowering the whole operation platform: taking the second upright post supporting mechanism in the reinforced concrete bent unit as the first upright post supporting mechanism, repeating the step 501, and completing the integral dismantling of a section of bent structure in the reinforced concrete bent unit so as to integrally descend the operating platform;

step six, dismantling a hoist platform: after the dismantling of the sections between the connecting beams (5) and the ring beams (8) in the reinforced concrete bent frame units is completed in the fifth step, the height of the hoist platform is reduced to the working height of the breaking hammer, and the breaking hammer is adopted on the hoist bent frame dismantling working platform to dismantle the hoist platform and the reinforced concrete bent frame units at the lower part of the hoist platform;

seventhly, cleaning and transporting waste residues: and (3) carrying the waste residues forming the operation platform for dismantling the stock frames of the hoist and all the waste residues on the top of the arch dam (1) to a specified waste residue site by pulling by using a backhoe loader.

2. The demolition construction method of a breaker hammer demolition from below of a hoist racker according to claim 1, characterized in that: the plugging steel plate is connected with the I-shaped steel in a welding mode, the length of a welding seam of the plugging steel plate is 3cm, the lower portion of the I-shaped steel is integrally fastened and connected through a plurality of connecting ribs, and the connecting ribs are perpendicular to the I-shaped steel.

3. The demolition construction method of a breaker hammer demolition from below of a hoist racker according to claim 1, characterized in that: in step 202, when the protection frame is closed, a safety net and a dense mesh net are hung on the inner sides of the outer rows of scaffolds in the protection frame to close the protection frame.

4. The demolition construction method of a breaker hammer demolition from below of a hoist racker according to claim 1, characterized in that: the I-steel is arranged along the water flow direction of the lower part of the arch dam (1), the length of the I-steel erected on the downstream side arch dam (1) of the gate hole (2) is 2.1m, and the length of the I-steel erected on the upstream side arch dam (1) of the gate hole (2) is 1.2 m.

5. The demolition construction method of a breaker hammer demolition from below of a hoist racker according to claim 1, characterized in that: the protective frame bodies are dismantled layer by layer and descend along with the dismantling of the upper structure of the hoist platform and the reduction of the height of the hoist platform.

6. The demolition construction method of a breaker hammer demolition from below of a hoist racker according to claim 1, characterized in that: and fifthly, crushing and dismantling sections between the connecting beam (5) and the ring beam (8) in the plurality of reinforced concrete bent units at the lower part of the hoist platform, and sequentially dismantling the plurality of reinforced concrete bent units from one side close to the river bank to the other side far away from the river bank.

Technical Field

The invention belongs to the technical field of gate dam engineering in hydraulic and hydroelectric engineering, and particularly relates to a breaking hammer dismantling construction method for dismantling a hoist bent from the lower part.

Background

Along with the acceleration of the construction process of basic facilities in China, the number of old building demolition projects is increased day by day, demolished structures are also developed from brick and wood structures to frame structures, plate structures and the like, and demolition of buildings or structures such as chimneys, water towers, bridges, wharfs, hydraulic engineering and the like is also developed from house demolition. After the general reservoir opening and closing machine room is used for a certain period of time, the general reservoir opening and closing machine room needs to be dismantled and rebuilt. When the reinforced concrete bent frame unit at the lower part of the hoist chamber is dismantled, due to the limitation of space, the reinforced concrete bent frame unit cannot be directly dismantled by adopting an explosion method, and when the reinforced concrete bent frame unit is dismantled manually, the time is long, and the progress requirement required by construction cannot be met, so that the construction difficulty is high when the reinforced concrete bent frame unit at the lower part of the hoist chamber is dismantled.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a breaking hammer dismantling construction method for dismantling a hoist bent from the lower part, aiming at the defects in the prior art, the method has simple steps and convenient construction, the upper structure of a hoist platform is dismantled in advance, then a reinforced concrete bent unit at the lower part of the hoist platform is dismantled in sections through the breaking hammer, after the hoist platform is lowered to the working height range of the breaking hammer, the whole hoist platform is dismantled by adopting the breaking hammer, the whole construction process is not limited by a field, few equipment is used, meanwhile, the influence on surrounding buildings and personnel is small, the harm to constructors is small, the construction method is environment-friendly, the construction efficiency can be effectively improved, and the construction cost is reduced.

In order to solve the technical problems, the invention adopts the technical scheme that: a construction method for dismantling a breaking hammer of an opening and closing machine bent frame from the lower part comprises the steps that the opening and closing machine bent frame comprises a plurality of reinforced concrete bent frame units which are arranged along the extending direction of an arch dam and are used for supporting an opening and closing machine chamber, the number of the opening and closing machine chambers is two, each opening and closing machine chamber comprises a plurality of operating rooms which are arranged along the extending direction of the arch dam and are communicated with each other, the lower part of each operating room is supported with one reinforced concrete bent frame unit, a ring beam is arranged between an operating platform at the bottom of the operating room and the top of each reinforced concrete bent frame unit, a plurality of gate holes are formed in the arch dam, a plurality of lifting holes matched with the gate holes are formed in the operating platform, reinforced concrete stairs are arranged between the two opening and closing machine chambers, each reinforced concrete bent frame unit comprises two upright post supporting mechanisms which are arranged along the extending direction of the arch dam, each upright post supporting mechanism comprises two supporting upright posts which are arranged along the width direction of the arch dam, and the middle parts of the two supporting upright posts in the upright post supporting mechanisms are connected with a connecting beam;

the method is characterized by comprising the following steps:

step one, plugging and protecting a brake hole and a hoisting hole of an opening and closing machine room, and the process is as follows:

step 101, plugging the apertures of the gate holes, wherein a protection system is erected at the top of the arch dam to plug and protect the apertures of the gate holes, the protection system comprises a plurality of I-shaped steels, plugging steel plates are laid on the upper portions of the I-shaped steels, and the aperture plugging protection process of each gate hole is as follows:

step 1011, dismantling the gate hole orifice guard rail: a circle of protective railings are arranged at the orifice of the gate hole along the circumferential direction of the orifice, and before plugging and protecting the orifice of the gate hole, constructors manually remove the protective railings and transport the protective railings to the outer side of the hoist bent;

step 1012, laying I-shaped steel at the orifice of the brake hole: analyzing the stress condition of a protection system according to the structural size and the material of a gate frame, determining the types and the intervals of a plurality of I-beams, arranging the I-beams at the orifice of a gate hole at equal intervals along the extension direction of an arch dam, respectively erecting the two ends of each I-beam on the arch dam on the two sides of the gate hole, and paving plugging steel plates on the upper parts of the paved I-beams to firmly connect the I-beams into a whole;

102, plugging a hoisting hole of an headstock gear chamber: paving a pavement board at the position of a lifting hole of the hoist platform to plug the lifting hole;

step two, carrying out safety protection around the bent to be dismantled, wherein the process is as follows:

step 201, erection of a protection frame body: erecting a double-row scaffold on one side of the hoist bent frame to form a protection frame body, wherein the protection frame body is erected on the downstream side of the arch dam from left to right along the extension direction of the arch dam;

step 202, sealing the protective frame body;

step three, dismantling the upper structure of the hoist platform, which comprises the following steps:

step 301, dismantling equipment inside the hoist chamber: dismantling the steel wire rope and the winch in the hoist chamber, disassembling the hoist in the hoist chamber, and lowering the dismantled steel wire rope, the winch and the hoist to the arch dam at the lower part of the hoist chamber;

step 302, dismantling doors and windows of the hoist chamber: manually removing all doors and windows on the hoist chamber, and lowering the removed doors and windows to the top of the arch dam;

step 303, dismantling a top plate and a side wall of the hoist chamber: dismantling a top plate and a side wall of a hoist chamber by adopting an air pick, dismantling the top plate and the side wall of the hoist chamber sequentially according to the sequence of a wall body and a beam column during dismantling, erecting a chute at a lifting hole, supporting the chute between the top of an arch dam and an operation platform, and placing the dismantled waste residues on the top of the arch dam through the chute;

step four, the hoist bent is dismantled and is used the construction of operation platform: adopting a small-sized back shovel to shovel the waste residues removed in the step 303 on the top of the arch dam to form a hoist bent frame removing operation platform, wherein all bent units are positioned above the hoist bent frame removing operation platform;

step five, reducing the range of the operating height from a hoist platform to the breaking hammer, wherein the hoist platform is a bottom plate of a hoist chamber and is formed by sequentially connecting a plurality of operating platforms, the heights of the operating platforms are sequentially reduced, so that the whole hoist platform is reduced to the range of the operating height of the breaking hammer, a section between a connecting beam and a ring beam in the reinforced concrete bent frame unit is broken and removed, and the operating platform is reduced to the operating height of the breaking hammer;

four in the reinforced concrete bent unit the section that lies in between tie beam and the girt on the support post all is by lower supreme a plurality of concrete chisel sections of removing that divide into, and the height that every concrete chisel removed the section is 10cm ~ 35cm, when carrying out the breakage to the section that lies in between tie beam and the girt in each reinforced concrete bent unit and demolish, the reinforced concrete bent unit between with tie beam and girt is demolishd by lower supreme multistage bent structure according to a plurality of concrete chisel sections in proper order, and the process that every section bent structure demolishs is as follows:

step 501, reducing the height of a first upright post supporting mechanism in a reinforced concrete bent unit, wherein one upright post supporting mechanism positioned on the inner side of the reinforced concrete bent unit is the first upright post supporting mechanism, and the process is as follows:

step 5011, chiseling the concrete of the support column at the downstream side of the first column support mechanism: utilizing a 240-type breaking hammer to lengthen a drill rod on the operation platform for dismantling the headstock creel built in the fourth step, chiseling concrete in a concrete chiseling section close to the upper side of the connecting beam on the support upright at the downstream side of the first upright support mechanism, and temporarily utilizing structural steel bars of the support upright to bear the load;

step 5012, chiseling the concrete of the support upright column at the upstream side of the first upright column support mechanism: regarding the support column on the upstream side in the first column support mechanism as the support column on the downstream side, repeating the step 5011, and chiseling the concrete in a concrete chiseling section on the upstream side of the support column on the first column support mechanism, which is close to the upper side of the connecting beam;

step 5013, inclining the operating platform: knocking the side parts of the exposed structural steel bars in the concrete chiseling sections where the concrete is chiseled on the two supporting stand columns in the first stand column supporting mechanism by using a hammer head, so that the structural steel bars of the concrete chiseling sections are bent towards the inner side of the arch dam and cut from the upper parts of the supporting stand columns, and one side, close to the first stand column supporting mechanism, of an operation platform above the reinforced concrete bent frame unit is downwards inclined;

step 502, lowering the whole operation platform: taking the second upright post supporting mechanism in the reinforced concrete bent unit as the first upright post supporting mechanism, repeating the step 501, and completing the integral dismantling of a section of bent structure in the reinforced concrete bent unit so as to integrally descend the operating platform;

step six, dismantling a hoist platform: after the dismantling of the sections, located between the connecting beams and the ring beams, in the reinforced concrete bent frame units is completed in the fifth step, the height of the hoist platform is reduced to the working height of the breaking hammer, and the breaking hammer is adopted on the hoist bent frame dismantling working platform to dismantle the hoist platform and the reinforced concrete bent frame units on the lower portion of the hoist platform;

seventhly, cleaning and transporting waste residues: and (3) carrying the waste residues forming the operation platform for dismantling the stock frames of the hoist and all the waste residues on the top of the arch dam to a specified waste residue site by pulling by using a backhoe loader.

The breaking hammer dismantling construction method for dismantling the headstock gear bent frame from the lower part is characterized by comprising the following steps of: the plugging steel plate is connected with the I-shaped steel in a welding mode, the length of a welding seam of the plugging steel plate is 3cm, the lower portion of the I-shaped steel is integrally fastened and connected through a plurality of connecting ribs, and the connecting ribs are perpendicular to the I-shaped steel.

The breaking hammer dismantling construction method for dismantling the headstock gear bent frame from the lower part is characterized by comprising the following steps of: in step 202, when the protection frame is closed, a safety net and a dense mesh net are hung on the inner sides of the outer rows of scaffolds in the protection frame to close the protection frame.

The breaking hammer dismantling construction method for dismantling the headstock gear bent frame from the lower part is characterized by comprising the following steps of: the I-steel is arranged along the water flow direction of the lower portion of the arch dam, the length of the I-steel erected on the arch dam on the downstream side of the gate hole is 2.1m, and the length of the I-steel erected on the arch dam on the upstream side of the gate hole is 1.2 m.

The breaking hammer dismantling construction method for dismantling the headstock gear bent frame from the lower part is characterized by comprising the following steps of: the protective frame bodies are dismantled layer by layer and descend along with the dismantling of the upper structure of the hoist platform and the reduction of the height of the hoist platform.

The breaking hammer dismantling construction method for dismantling the headstock gear bent frame from the lower part is characterized by comprising the following steps of: and fifthly, crushing and dismantling sections between the connecting beams and the ring beams in the plurality of reinforced concrete bent units at the lower part of the hoist platform, and dismantling the plurality of reinforced concrete bent units in sequence from one side close to the river bank to one side far away from the river bank.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, double rows of scaffolds are erected on the downstream side of the hoist bent frame for protection during the dismantling of the hoist bent frame, and the gate hole and the lifting hole are plugged, so that the construction safety can be effectively improved, and the waste residues dismantled in the construction process can be prevented from falling into the reservoir area to pollute water in the reservoir area.

2. According to the invention, the upper structure of the hoist platform is dismantled in advance, so that the load bearing of the lower reinforced concrete bent unit can be effectively reduced, the lower reinforced concrete bent unit can be conveniently and rapidly dismantled, the construction efficiency can be effectively improved, meanwhile, the investment of manpower and material resources in the construction process can be effectively reduced, and the construction cost can be effectively reduced.

3. The reinforced concrete bent frame units at the lower parts of the operating platforms are dismantled in sections, so that the heights of the operating platforms are reduced, the hoist platforms are conveniently and integrally broken and dismantled through breaking hammers, the whole construction process is not limited by sites, less equipment is used, the cost is low, meanwhile, the influence on surrounding buildings and personnel is small, the harm to constructors is small, and the environment friendliness of the construction method is high.

4. According to the invention, the two upright post supporting mechanisms in each reinforced concrete bent unit are dismantled from inside to outside, and the two supporting upright posts in the upright post supporting mechanisms are dismantled from the downstream side to the upstream side, so that the operating platform at the top of the reinforced concrete bent unit to be dismantled can be inclined towards the middle of the arch dam, the operating platform is prevented from collapsing outwards in an inclined manner, and further waste residues are prevented from falling into a reservoir area.

In conclusion, the method has simple steps and convenient and fast construction, the upper structure of the hoist platform is dismantled in advance, then the reinforced concrete bent frame unit at the lower part of the hoist platform is dismantled in sections through the breaking hammer, and after the hoist platform is lowered to the working height range of the breaking hammer, the whole hoist platform is dismantled by the breaking hammer in a breaking mode.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a block flow diagram of the present invention.

Fig. 2 is a schematic structural diagram of the hoist bent of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is an enlarged view of fig. 3 at B.

Fig. 5 is a cross-sectional view C-C of fig. 2.

Description of reference numerals:

1-arch dam; 2-a gate hole; 3-reinforced concrete stairs;

4, supporting the upright post; 5, connecting the beam; 6-an opening and closing machine chamber;

6-1-operating room; 6-2-operation platform; 7, lifting holes;

8-ring beam.

Detailed Description

The invention relates to a breaking hammer dismantling construction method for dismantling an headstock gear bent from the lower part, as shown in figures 2, 3, 4 and 5, the headstock gear bent comprises a plurality of reinforced concrete bent units which are arranged along the extending direction of an arch dam 1 and are used for supporting a headstock gear chamber 6, the number of the headstock gear chambers 6 is two, each headstock gear chamber 6 comprises a plurality of operating rooms 6-1 which are arranged along the extending direction of the arch dam 1 and are communicated with each other, the lower part of each operating room 6-1 supports one reinforced concrete bent unit, a ring beam 8 is arranged between an operating platform 6-2 at the bottom of the operating room 6-1 and the top of each reinforced concrete bent unit, a plurality of gate holes 2 are arranged on the arch dam 1, a plurality of lifting holes 7 which are matched with the gate holes 2 are arranged on the operating platform 6-2, a reinforced concrete stair 3 is arranged between the two hoist chambers 6, the reinforced concrete bent frame unit comprises two upright post supporting mechanisms arranged along the extension direction of the arch dam 1, each upright post supporting mechanism comprises two supporting upright posts 4 arranged along the width direction of the arch dam 1, and the middle parts of the two supporting upright posts 4 in the upright post supporting mechanisms are connected with a connecting beam 5;

in actual use, the two hoist chambers 6 are symmetrically arranged on two sides of the reinforced concrete stair 3, the lower part of each hoist chamber 6 supports three reinforced concrete bent units, and each operating platform 6-2 is provided with two lifting holes 7 matched with the gate holes 2.

It should be noted that the hoist chamber 6 is mainly a frame and brick masonry structure, the total height of the upper hoist chamber is 4.6m, the width is 5.3m, the length of a single chamber is about 38.4m, the top plate of the hoist chamber 6 is a precast concrete plate structure, the thickness is about 12cm, the bottom plate of the hoist chamber 6, namely the hoist platform, is a cast-in-place concrete plate beam structure, and the thickness is 15 cm.

In this embodiment, when the hoist bent is removed, in order to improve the construction efficiency and combine the requirements of a construction site and a construction period, the hoist bent structures at the lower portions of the two hoist chambers 6 may be removed synchronously, the removal method of the hoist bent structures at the lower portions of the two hoist chambers 6 is the same, and the reinforced concrete stairs 3 are removed by descending synchronously with the reinforced concrete bent units at both sides.

Characterized in that, as shown in fig. 1, the method comprises the following steps:

step one, plugging and protecting a brake hole and a hoisting hole of an opening and closing machine room, and the process is as follows:

step 101, plugging the apertures of the gate holes, as shown in fig. 2, a protection system is erected on the top of the arch dam 1 to plug and protect the apertures of the gate holes 2, the protection system comprises a plurality of i-shaped steels, plugging steel plates are laid on the upper portions of the i-shaped steels, and the aperture plugging protection process of each gate hole 2 is as follows:

step 1011, dismantling the gate hole orifice guard rail: a circle of protective railings are arranged at the orifice of the gate hole 2 along the circumferential direction of the orifice, and before plugging and protecting the orifice of the gate hole 2, constructors manually remove the protective railings and transport the protective railings to the outer side of the hoist bent frame;

step 1012, laying I-shaped steel at the orifice of the brake hole: analyzing the stress condition of a protection system according to the structural size and the material of a gate frame, determining the types and the intervals of a plurality of I-beams, arranging the I-beams at the orifice of a gate hole 2 at equal intervals along the extension direction of an arch dam 1, respectively erecting the two ends of the I-beams on the arch dam 1 at the two sides of the gate hole 2, and laying plugging steel plates on the upper parts of the laid I-beams to tightly connect the I-beams into a whole;

during the in-service use, before carrying out demolising of headstock gear framed bent, carry out the shutoff and then form safe construction and protection platform with floodgate hole 2 through adopting I-steel and shutoff steel sheet, not only can avoid carrying out the demolising in-process of headstock gear framed bent, the waste residue of demolising falls into to lower part storehouse district from floodgate hole 2, can guarantee constructor's personal safety simultaneously, and then can effectively improve the efficiency of construction.

It should be noted that the length of the I-beam is preferably 6m of I18I-beam, the I-beam is arranged along the water flow direction, and the distance between two adjacent I-beams is preferably 0.3 m; the thickness of the plugging steel plate is preferably 1cm, and the whole gate hole 2 can be covered.

It should be noted that a railing base for installing the protection railing is arranged at the opening of the gate hole 2, and the downstream section of the i-steel laid at the gate hole 2 is arranged next to the railing base at the downstream side.

102, plugging a hoisting hole of an headstock gear chamber: paving a pavement board at the position of a lifting hole 7 of the hoist platform to plug the lifting hole 7;

during the in-service use, when carrying out demolishing of headstock gear 6, in order to avoid the waste residue of demolishing to drop to arch dam 1 top from lifting hole 7 and cause certain casualties, form safe construction and protection platform after carrying out the shutoff with lifting hole 7 through the pavement slab that the size is 25cm x 300 cm.

Step two, carrying out safety protection around the bent to be dismantled, wherein the process is as follows:

step 201, erection of a protection frame body: erecting a double-row scaffold on one side of the hoist bent to form a protection frame body, wherein the protection frame body is erected on the downstream side of the arch dam 1 from left to right along the extension direction of the arch dam 1;

during the in-service use, for the convenience of constructor operation, double-row scaffold is all set up to the left and right sides of headstock gear framed bent, and the double-row scaffold of headstock gear framed bent left and right sides is fixed as an organic whole rather than the protection support body fastening overlap joint of downstream side, all is provided with the bridging on the double-row scaffold who sets up.

It should be noted that, in order to ensure the personal safety of the constructors, a circle of guard rails is further arranged on the top plate of the hoist chamber 6.

Step 202, sealing the protective frame body;

step three, dismantling the upper structure of the hoist platform, which comprises the following steps:

step 301, dismantling equipment inside the hoist chamber: dismantling the steel wire rope and the winch in the hoist chamber 6, disassembling the hoist in the hoist chamber 6, and lowering the dismantled steel wire rope, the winch and the hoist to the arch dam 1 at the lower part of the hoist chamber 6;

during the in-service use, before carrying out demolising of headstock gear room 6, should demolish equipment such as the hoist engine in headstock gear room 6 earlier, before new headstock gear room is rebuild and the hoist engine installation is accomplished, the gate still mangers water, rebuilds when headstock gear room and the hoist engine installation is accomplished the back, promotes the gate and goes out the portal and carry out the gate slot and demolish, covers the protection to the cable of dismantling simultaneously, prevents accidental injures by a crashing object.

Step 302, dismantling doors and windows of the hoist chamber: manually removing all doors and windows on the hoist chamber 6, and lowering the removed doors and windows to the top of the arch dam 1;

step 303, dismantling a top plate and a side wall of the hoist chamber: a pneumatic pick is adopted to demolish a top plate and a side wall of the hoist chamber, the top plate and the side wall are sequentially demolished in the sequence of firstly demolishing the wall body and then the beam column, a chute is erected at a lifting hole 7, the chute is supported between the top of the arch dam 1 and an operation platform, and the demolished waste residues are placed on the top of the arch dam 1 through the chute;

during actual use, when the hoist bent is dismantled, the hoist chamber 6 needs to be dismantled at first to achieve the purpose of reducing weight, when the hoist chamber 6 is dismantled, construction is carried out according to the sequence of the top plate and the side wall, and the single top plate and the single side wall are dismantled according to the sequence of the wall body and the beam column.

When the roof is dismantled, a constructor moves up to the roof of the hoist chamber 6 under the protection of the downstream protection frame body and the double rows of scaffolds on two sides, firstly, the prefabricated slab of the roof is manually broken and dismantled by adopting an air pick, and considering that the quantity of the waste residues for roof dismantling is less, the dismantled waste residues directly fall onto the hoist platform below; when the lower cross beam of the precast slab is dismantled, a 3 m-high and movable scaffold can be erected on the hoist platform, and one side of the cross beam is broken and dismantled by adopting an air pick; and after the whole top plate of the hoist chamber 6 is completely removed, adopting a semi-closed chute to slide slag to the top of the arch dam 1.

In the embodiment, when the side wall is dismantled, the side wall is dismantled according to the sequence of firstly removing the wall and then removing the column, the wall is cut in a layered notch or a local wall saw from top to bottom on the inner side of the wall, and is directionally laid down and dismantled through the traction of a steel wire rope, and meanwhile, a constructor uses a sledge hammer to assist in knocking from the outer side of the wall so that slag materials of the wall fall indoors; when the conditions are met, the small excavator can be lifted into the hoist chamber 6 to complete the dismantling of the frame structure, the lower stream surface of the hoist chamber 6 utilizes the scaffold as a construction platform, and 2 m-high movable scaffolds are erected in the hoist chamber 6 at two sides and the upstream of the hoist chamber 6 as the construction platform; the demolished waste slag is also discharged to the top of the arch dam 1 by a semi-closed chute.

During actual use, when waste residues on the operating platform are slid, the waste residues around the lifting hole 7 are cleaned, the pavement slab covering the lifting hole 7 is removed, and a chute is erected on the lifting hole 7 to finish the sliding of the waste residues.

Step four, the hoist bent is dismantled and is used the construction of operation platform: adopting a small-sized back shovel to shovel the waste residues removed in the step 303 on the top of the arch dam 1 to form a hoist bent frame removing operation platform, wherein all bent units are positioned above the hoist bent frame removing operation platform;

during actual use, in order to facilitate the construction of the breaking hammer, a breaking hammer operation platform is built on the top of the arch dam 1 by using waste residues removed from the hoist chamber 6, namely the operation platform for removing the hoist bent frame, so that the operation range of the breaking hammer is expanded as much as possible, and the operation height of the breaking hammer can reach the arrangement height position of the connecting beam 5.

It should be noted that, after the breaking hammer operation platform is built, the residual waste residues on the top of the arch dam 1 can pass through 2.0m³The loader or the PC220 breaking hammer is modified into a backhoe loader, then the backhoe loader is transported to a temporary construction site for piling up through a 10t dump truck, and finally the backhoe loader is transported to a slag yard.

Step five, reducing the range of the operating height from a hoist platform to the breaking hammer, wherein the hoist platform is a bottom plate of a hoist chamber 6 and is formed by sequentially connecting a plurality of operating platforms 6-2, the heights of the operating platforms 6-2 are sequentially reduced, so that the whole hoist platform is reduced to the range of the operating height of the breaking hammer, a section between a connecting beam 5 and a ring beam 8 in the reinforced concrete bent frame unit is broken and removed, and the operating platform 6-2 is reduced to the operating height of the breaking hammer;

four in the reinforced concrete bent frame unit the section that lies in between tie beam 5 and collar tie beam 8 on the support post 4 all is by descending supreme a plurality of concrete chisel sections of removing, and the height that every concrete chisel removed the section is 10cm ~ 35cm, when carrying out the broken dismantlement to the section that lies in between tie beam 5 and collar tie beam 8 in each reinforced concrete bent frame unit, the reinforced concrete bent frame unit between tie beam 5 and collar tie beam 8 is by descending supreme a plurality of sections bent frame structure and is demolishd in proper order according to a plurality of concrete chisel sections, and the process that every section bent frame structure demolishs is as follows:

during actual use, when the reinforced concrete bent frame units are dismantled in sections, the four supporting columns 4 in each section of bent frame structure are dismantled in sequence according to the sequence of the downstream inner supporting column, the upstream inner supporting column, the downstream outer supporting column and the upstream outer supporting column, the operating platform 6-2 at the top of the reinforced concrete bent frame units to be dismantled can be inclined towards the middle of the arch dam 1, the operating platform 6-2 is prevented from being inclined outwards and collapsed, and waste residues are prevented from falling into a reservoir area.

In this embodiment, the length of one concrete chiseling section located at the lowermost end of the support column 4 is preferably 30cm to 35cm, and the lengths of the other concrete chiseling sections on the support column 4 are 20 cm.

In this embodiment, each hoist chamber 6 corresponds to one hoist platform, and each hoist platform is formed by connecting three operating platforms 6-2.

During actual use, when the range of the operation height from the hoist platform to the breaking hammer needs to be reduced, all sections, located between the upper end of the connecting beam 5 and the lower end of the ring beam 8, on the supporting upright post 4 are dismantled.

Step 501, reducing the height of a first upright post supporting mechanism in a reinforced concrete bent unit, wherein one upright post supporting mechanism positioned on the inner side of the reinforced concrete bent unit is the first upright post supporting mechanism, and the process is as follows:

step 5011, chiseling the concrete of the support column at the downstream side of the first column support mechanism: utilizing a 240-type breaking hammer to lengthen a drill rod on the operation platform for dismantling the headstock frame built in the fourth step, chiseling concrete in a concrete chiseling section close to the upper side of the connecting beam 5 on the support upright post 4 at the downstream side of the first upright post support mechanism, and temporarily utilizing structural steel bars of the support upright post 4 to bear the load;

in actual use, when the concrete is crushed in the concrete cutting section, the crushing is started from the inner side of the support column 4, that is, the removal is started from the upstream side of the support column 4 for the support column 4 on the downstream side, and the removal is started from the downstream side of the support column 4 for the support column 4 on the upstream side.

It should be noted that, a side of the reinforced concrete bent unit near the center of the arch dam 1 is regarded as an inner side of the reinforced concrete bent unit.

Step 5012, chiseling the concrete of the support upright column at the upstream side of the first upright column support mechanism: regarding the upstream side support column 4 of the first column support mechanism as the downstream side support column 4, repeating the step 5011, and chiseling the concrete in the one chiseling section of the concrete on the upstream side support column 4 of the first column support mechanism close to the upper side of the tie beam 5;

step 5013, inclining the operating platform: knocking the side parts of the exposed structural steel bars in the concrete chiseling sections of the two support columns 4 in which the concrete is chiseled off in the first column support mechanism by using a hammer head, bending the structural steel bars of the concrete chiseling sections towards the inner side of the arch dam 1 and cutting the structural steel bars from the upper parts of the support columns 4, wherein one side of an operation platform 6-2 above the reinforced concrete bent frame unit, which is close to the first column support mechanism, is downwards inclined;

in actual use, when concrete is crushed, a steel wire rope and a chain block are required to be arranged at a designated position on the operation platform 6-2 to be dismantled to control the inclination direction of the operation platform, so that the operation platform 6-2 is prevented from inclining towards the upstream side or the downstream side of the arch dam 1.

Step 502, lowering the whole operation platform: taking the second upright post supporting mechanism in the reinforced concrete bent unit as the first upright post supporting mechanism, repeating the step 501, and completing the integral dismantling of a section of bent structure in the reinforced concrete bent unit so as to integrally descend the operating platform;

in practical use, the steps 501 to 502 are repeated for a plurality of times until the plurality of ring beams 8 are lowered and supported on the connecting beam 5, and the platform of the hoist is lowered to the range of the operation height of the breaking hammer, so that the breaking hammer can break and disassemble the whole body of the breaking hammer, the breaking starts from two sides of the bent frame of the hoist, the steel bars are broken section by section and cut off section by section, and the steel bars are cleaned as far as possible, and the breaking hammer operation and the slag loading operation are prevented from being influenced.

Step six, dismantling a hoist platform: after the dismantling of the sections, located between the connecting beam 5 and the ring beam 8, in the reinforced concrete bent frame units is completed in the fifth step, the height of the hoist platform is reduced to the working height of the breaking hammer, and the breaking hammer is adopted on the hoist bent frame dismantling working platform to dismantle the hoist platform and the reinforced concrete bent frame units on the lower portion of the hoist platform;

seventhly, cleaning and transporting waste residues: and (3) carrying the waste residues forming the operation platform for dismantling the stock frames of the hoist and all the waste residues on the top of the arch dam 1 to a specified waste residue site by pulling by using a backhoe loader.

During actual use, the waste residues on the top of the arch dam 1 are transported to a specified slag yard by a 10t dump truck, and meanwhile, a protection system on the gate hole 2 is removed and transported to a specified place, so that the waste residues can be recycled for multiple times.

In this embodiment, shutoff steel sheet and I-steel welded connection and its welding seam length are 3cm, and is a plurality of the lower part of I-steel is as an organic whole through a plurality of splice bar fastening connection, splice bar and I-steel mutually perpendicular.

During the in-service use, through with shutoff steel sheet and I-steel welded fastening, set up the splice bar in the lower part of I-steel simultaneously and consolidate a plurality of I-steels, can improve the structural strength and the reliability of whole protection system, avoid 2 tops in floodgate hole to have the waste residue to drop the time, lead to the protection system to take place to destroy or shift, and then pollute the reservoir area.

In this embodiment, the preferred reinforcing bar that is the diameter for the splice bar is 22mm, and the preferred 1m that is apart from between two adjacent splice bars, welded fastening between splice bar and the I-steel.

In this embodiment, in step 202, when the protection frame body is closed, a safety net and a dense mesh net are hung on the inner sides of the outer rows of scaffolds in the protection frame body to close the protection frame body.

In this embodiment, the h-shaped steel is laid along the water flow direction of the lower portion of the arch dam 1, the length of the h-shaped steel laid on the arch dam 1 on the downstream side of the gate hole 2 is 2.1m, and the length of the h-shaped steel laid on the arch dam 1 on the upstream side of the gate hole 2 is 1.2 m.

During the in-service use, through the segment setting up in 2 both sides of brake hole with the both ends of I-steel be provided with certain length respectively, can improve the bearing capacity of I-steel, and then improve the bearing capacity of whole protection system, avoid the too big emergence of protection system atress to topple.

In this embodiment, the protective frame body is removed and lowered layer by layer along with the removal of the upper structure of the hoist platform and the reduction of the height of the hoist platform.

During the in-service use, set up the scaffold frame respectively in the downstream side and the left and right sides of headstock gear framed bent, an effect is for the convenience of constructor climbing from top to bottom, and another effect is exactly protecting, avoids the waste residue to drop to the reservoir area.

It should be noted that, along with the removal of the hoist chamber 6 and the reinforced concrete bent unit, the operation height of the constructor also descends, the scaffold above the structure loses the protection effect, and can be removed together with the structure in a synchronous manner, so that the construction efficiency can be effectively improved, and after the removal of the integral bent is completed, the scaffold does not need to be removed independently, and the construction difficulty can be effectively reduced.

In the fifth step, the sections of the plurality of reinforced concrete bent units at the lower part of the hoist platform, which are located between the connecting beam 5 and the ring beam 8, are broken and removed, and the plurality of reinforced concrete bent units are sequentially removed from the side close to the river bank to the side far away from the river bank.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.