阅读说明：本技术 一种双叶立转式开启桥及施工方法 (Double-blade vertical rotation type opening bridge and construction method ) 是由 龙绍章 吴昊 潘孝金 陈万 吴庆超 徐昌 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种双叶立转式开启桥及施工方法,该双叶立转式开启桥包括两个对称设置的单边桥体,单边桥体包括桥墩、轴承座、液压油缸、中部锁定装置及桥体钢结构,桥体钢结构由配重段、轴承段及悬臂段拼接而成。本发明的桥体钢结构由配重段、轴承段及悬臂段拼接而成,桥体钢结构安装时,分段安装配重段、轴承段及悬臂段,可以确保开启桥的顺利施工,并能最大程度上减少对航道通行的影响。(The invention discloses a double-blade vertical rotation type opening bridge and a construction method thereof. The bridge steel structure is formed by splicing the counterweight section, the bearing section and the cantilever section, and when the bridge steel structure is installed, the counterweight section, the bearing section and the cantilever section are installed in sections, so that smooth construction of opening a bridge can be ensured, and the influence on passage of a channel can be reduced to the greatest extent.)

1. A double-blade vertical rotation type opening bridge is characterized by comprising two symmetrically arranged single-side bridge bodies, wherein each single-side bridge body comprises a bridge pier, a bearing seat, a hydraulic oil cylinder, a middle locking device and a bridge steel structure, the bearing seats and the hydraulic oil cylinders are arranged between the bridge steel structure and the bridge pier,

the bridge steel structure is formed by splicing a balance weight section, a bearing section and a cantilever section, the bearing section is rotatably connected with the bridge pier through the bearing seat, the movable end of the hydraulic oil cylinder is fixed with the bearing section, the fixed end of the hydraulic oil cylinder is fixed with the bridge pier, the hydraulic oil cylinder drives the bridge steel structure to rotate along the bearing seat, and the middle locking device is arranged at the front end of the cantilever section.

2. The dual-leaf vertically-rotating opening bridge of claim 1, wherein the counterweight segment comprises a first segment, the bearing segment comprises a second segment, the cantilever segment comprises a third segment and a fourth segment, and the first segment, the second segment, the third segment and the fourth segment are spliced together in sequence.

3. The double-blade vertical rotation type opening bridge of claim 1, wherein the counterweight section, the bearing section and the cantilever section each comprise a plurality of main longitudinal beams arranged at intervals, a plurality of main transverse beams arranged at intervals are arranged between two adjacent main longitudinal beams, a plurality of secondary longitudinal beams arranged at intervals are arranged at the top between two adjacent main transverse beams, a plurality of secondary transverse beams arranged at intervals are arranged between two adjacent secondary longitudinal beams, and a horizontal inclined strut is arranged at the bottom of each main longitudinal beam between two adjacent main transverse beams.

4. The double-leaf vertical rotation type opening bridge according to claim 3, wherein a weight box is arranged between the tail ends of two adjacent main longitudinal beams of the weight section, a bearing seat and a hydraulic oil cylinder are arranged between each main longitudinal beam of the bearing section and the pier, each main longitudinal beam of the bearing section is connected with the corresponding bearing seat through a rotating shaft assembly, and each main longitudinal beam of the bearing section is connected with the movable end of the corresponding hydraulic oil cylinder through an upper oil cylinder support.

5. The double-blade vertical rotation type opening bridge of claim 4, wherein a front support upper support is arranged at the bottom of each main longitudinal beam of the bearing section, the oil cylinder upper support is arranged between the front support upper support and the rotating shaft assembly, a plurality of front support lower supports matched with the front support upper supports are arranged at the top of the front end of the pier, and when the single-side bridge body is in a closed state, each front support upper support is in contact with the corresponding front support lower support.

6. The double-blade vertical rotation type opening bridge according to claim 1, wherein the bridge pier comprises a main pier bearing platform and a main pier chamber arranged on the main pier bearing platform, a bearing seat steel support and a lower oil cylinder support are arranged in the main pier chamber, the bearing seat is fixed to the top of the bearing seat steel support through a bearing seat cross beam, and the fixed end of the hydraulic oil cylinder is connected with the lower oil cylinder support.

7. The double-blade vertical rotation type opening bridge of claim 6, wherein the top of the shear wall on both sides of the main pier chamber is provided with a fixed bridge plate, the counterweight segment is located under the fixed bridge plate, the rear end of the main pier chamber is provided with an approach bridge, the approach bridge is flush with the fixed bridge plate, the top of the bearing segment is flush with the top of the cantilever segment, the top of the bearing segment is higher than that of the counterweight segment, the top of the bearing segment is provided with a bridge deck, and when the unilateral bridge body is in a closed state, the bridge deck is flush with the fixed bridge plate.

8. A construction method of a double-blade vertical rotation type opening bridge is characterized by comprising the following steps:

step S1: installing a crane rail platform at the first section of the north bridge and a crane rail platform bracket at the lower part;

step S2: installing a north bridge bearing seat and a hydraulic oil cylinder;

step S3: installing a crane track platform at the upper part of the north bridge;

step S4: installing a bearing section, a counterweight section and a cantilever section of the north bridge;

step S5: paving a north bridge deck and debugging a unilateral north bridge body;

step S6: the platform support of the crane rail at the lower part of the south bridge and the crane rail at the first section are installed flatly;

step S7: mounting a south bridge bearing seat and a hydraulic oil cylinder;

step S8: installing a crane rail platform on the upper part of the south bridge;

step S9: mounting a bearing section, a counterweight section and a cantilever section of the south bridge;

step S10: paving a south bridge deck and debugging a south bridge unilateral bridge body;

step S11: and (4) carrying out combined debugging on the south bridge and the north bridge and installing a middle locking device.

9. The construction method of the double-blade vertical rotation type opening bridge according to claim 8, wherein the step S5 specifically comprises:

step S51: dismantling a crane rail platform at the upper part of the north bridge;

step S52: dismantling a crane rail platform bracket at the lower part of the north bridge;

step S53: paving the north bridge deck concrete;

step S54: and debugging the unilateral bridge body of the north bridge.

10. The construction method of the double-blade vertical rotation type opening bridge according to claim 8, wherein the step S10 specifically comprises:

step S101: dismantling a crane rail platform on the upper part of the south bridge;

step S102: dismantling a crane rail platform bracket at the lower part of the south bridge;

step S103: paving south bridge deck concrete;

step S104: and debugging the south bridge single-side bridge body.

Technical Field

The invention relates to the technical field of opening bridges, in particular to a double-blade vertical rotation type opening bridge and a construction method.

Background

The open bridges are relatively old bridge types, the countries with the most open bridges in the world are the United states, nearly 3000 open bridges are built in China so far, the number of the open bridges built in China is small, and the number of the open bridges belonging to heavy traffic is small. When land transportation is not busy, ships sail on rivers and fixed bridges cannot be built above navigation clearance, open bridges need to be built, and therefore land and water traffic is solved. The open bridge has a plurality of types, one type is a flat-rotating open bridge, two holes are bridged together, a machine is arranged on a pier between the two holes, the two holes of the bridge rotate ninety degrees on the water surface around the pier and are vertical to the original position of the bridge, a two-hole channel is left, and ships can pass through the bridge without hindrance from top to bottom. One is a lifting open bridge, on the piers at both sides of a hole bridge, each tower frame is erected, and a machine is installed, so that the hole bridge can be lifted between the tower frames, just like an elevator, when a bridge hole is lifted, a ship can pass through the hole bridge. One is a push-to-open bridge, where a hole bridge is mechanically pulled along a horizontal plane as if a drawer were pulled to clear the way to the ship. One is a vertical rotary open bridge, which is divided into a single blade or a double blade, each blade takes a pier support as the center, and the machine rotates to enable one end of the blade to be near the empty space, gradually rises and is higher than the water surface, so that a middle channel can be left for sailing.

It is convenient to open the bridge to rotate immediately, and the post that naturally forms when opening is favorable to passing vehicle safety protection, nevertheless because of receiving the restriction of balanced heavy, the span of opening the hole roof beam is big than other opening bridges of the aforesaid, and roof beam portion structure is huge and complicated, brings very big difficulty for the construction of opening the bridge, and can lead to the fact very big influence to the channel is current during the construction.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a double-blade vertical rotation type opening bridge and a construction method.

The technical scheme of the invention is as follows:

in a first aspect, the invention provides a double-blade vertical rotation type opening bridge, which comprises two symmetrically arranged single-side bridge bodies, wherein each single-side bridge body comprises a bridge pier, a bearing seat, a hydraulic oil cylinder, a middle locking device and a bridge steel structure, the bearing seats and the hydraulic oil cylinders are arranged between the bridge steel structure and the bridge pier,

the bridge steel structure is formed by splicing a balance weight section, a bearing section and a cantilever section, the bearing section is rotatably connected with the bridge pier through the bearing seat, the movable end of the hydraulic oil cylinder is fixed with the bearing section, the fixed end of the hydraulic oil cylinder is fixed with the bridge pier, the hydraulic oil cylinder drives the bridge steel structure to rotate along the bearing seat, and the middle locking device is arranged at the front end of the cantilever section.

According to the invention of the above aspect, the weight section includes a first section, the bearing section includes a second section, the cantilever section includes a third section and a fourth section, and the first section, the second section, the third section and the fourth section are sequentially spliced together.

According to the invention of the scheme, each of the counterweight section, the bearing section and the cantilever section comprises a plurality of main longitudinal beams arranged at intervals, a plurality of main cross beams arranged at intervals are arranged between every two adjacent main longitudinal beams, a plurality of secondary longitudinal beams arranged at intervals are arranged at the top between every two adjacent main cross beams, a plurality of secondary cross beams arranged at intervals are arranged between every two adjacent secondary longitudinal beams, and horizontal inclined struts are arranged at the bottoms of the main longitudinal beams between every two adjacent main cross beams.

Furthermore, it is a plurality of horizontal bracing, it is a plurality of secondary longeron and a plurality of form a cavity between the secondary crossbeam, set up the access passage in the cavity, the access passage is corresponding be provided with the hole that can walk the people on the main beam.

Furthermore, a weight box is arranged between the tail ends of two adjacent main longitudinal beams of the weight balancing section, one bearing seat and one hydraulic oil cylinder are arranged between each main longitudinal beam of the bearing section and the pier, each main longitudinal beam of the bearing section is connected with the corresponding bearing seat through a rotating shaft assembly, and each main longitudinal beam of the bearing section is connected with the movable end of the corresponding hydraulic oil cylinder through an upper oil cylinder support.

Furthermore, each main longitudinal beam bottom of the bearing section is provided with a front support upper support, the oil cylinder upper support is located between the front support upper support and the rotating shaft assembly, the top of the front end of the pier is provided with a plurality of front support lower supports matched with the front support upper supports, and when the single-side bridge body is in a closed state, each front support upper support is in contact with the corresponding front support lower support.

According to the scheme, the pier comprises a main pier bearing platform and a main pier box chamber arranged on the main pier bearing platform, a bearing seat steel support and an oil cylinder lower support are arranged in the main pier box chamber, the bearing seat is fixed to the top of the bearing seat steel support through a bearing seat cross beam, and the fixed end of the hydraulic oil cylinder is connected with the oil cylinder lower support.

Further, the shear force wall top of main mound case room both sides is provided with fixed bridge deck, the rear end of main mound case room is provided with the approach bridge, the counter weight section is located the below of fixed bridge deck, the approach bridge with fixed bridge deck parallel and level, the bearing section with the top parallel and level of cantilever section, just the bearing section with the top of cantilever section is higher than the top of counter weight section, the bearing section with the top of cantilever section is provided with the decking, works as when unilateral pontic is in the closed condition, the decking with fixed bridge deck parallel and level.

In a second aspect, the invention provides a construction method of a double-blade vertical rotation type opening bridge, which comprises the following steps:

step S1: installing a crane rail platform at the first section of the north bridge and a crane rail platform bracket at the lower part;

step S2: installing a north bridge bearing seat and a hydraulic oil cylinder;

step S3: installing a crane track platform at the upper part of the north bridge;

step S4: installing a bearing section, a counterweight section and a cantilever section of the north bridge;

step S5: paving a north bridge deck and debugging a unilateral north bridge body;

step S6: the platform support of the crane rail at the lower part of the south bridge and the crane rail at the first section are installed flatly;

step S7: mounting a south bridge bearing seat and a hydraulic oil cylinder;

step S8: installing a crane rail platform on the upper part of the south bridge;

step S9: mounting a bearing section, a counterweight section and a cantilever section of the south bridge;

step S10: paving a south bridge deck and debugging a south bridge unilateral bridge body;

step S11: and (4) carrying out combined debugging on the south bridge and the north bridge and installing a middle locking device.

According to the present invention in the foregoing aspect, step S5 specifically includes:

step S51: dismantling a crane rail platform at the upper part of the north bridge;

step S52: dismantling a crane rail platform bracket at the lower part of the north bridge;

step S53: paving the north bridge deck concrete;

step S54: and debugging the unilateral bridge body of the north bridge.

According to the present invention in the foregoing aspect, step S10 specifically includes:

step S101: dismantling a crane rail platform on the upper part of the south bridge;

step S102: dismantling a crane rail platform bracket at the lower part of the south bridge;

step S103: paving south bridge deck concrete;

step S104: and debugging the south bridge single-side bridge body.

According to the invention of the scheme, the beneficial effects of the invention are as follows:

1. the bridge steel structure is formed by splicing the counterweight section, the bearing section and the cantilever section, and when the bridge steel structure is installed, the counterweight section, the bearing section and the cantilever section are installed in sections, so that smooth construction of opening a bridge can be ensured, and the influence on passage of a channel can be reduced to the greatest extent;

2. the invention adopts the independent construction method of the north-south bridge, after the installation of the unilateral bridge body and the debugging are finished, the bridge body is opened, and the other half bridge body is installed, thereby reducing the influence on the passage of a channel, mastering and controlling the navigation time period according to the passage time characteristics of large ships, and carrying out the full-bridge combined debugging;

3. according to the invention, the crane rail steel platform is erected in the box chamber of the open bridge main pier, the construction method of assembling the cantilever of the crawler crane is adopted, the weight and the size of a single hoisting component are reduced, large-scale special equipment is not needed, the main longitudinal beam butt joint and the secondary beam installation are connected by the bolts, the installation difficulty is reduced, the construction period is shortened, the influence on the passage of a navigation channel is reduced to the maximum extent, and good economic benefits and social benefits are obtained.

Drawings

FIG. 1 is a schematic plan view of the present invention;

FIG. 2 is a schematic longitudinal cross-sectional view of the present invention;

FIG. 3 is a schematic longitudinal cross-sectional view of a single-sided bridge according to the present invention;

FIG. 4 is a schematic plan view of the bridge steel structure according to the present invention;

FIG. 5 is a schematic view of the connection of the bearing segments of the present invention with a bearing block and a hydraulic ram;

FIG. 6 is a schematic view of the cantilever section and the mid-lock of the present invention;

FIG. 7 is a flow chart of the construction of the present invention;

FIG. 8 is a detailed construction flowchart of step S5 in FIG. 7;

fig. 9 is a detailed construction flowchart of step S10 in fig. 7.

In the context of the figures, it is,

1. a bridge pier; 11. the front support supports the lower support; 12. a main pier cap; 13. a main pier box chamber; 14. a bearing seat steel support; 15. a lower support of the oil cylinder; 16. a bearing block cross beam; 17. fixing the bridge plate; 18. bridge approach;

2. a bearing seat;

3. a hydraulic cylinder;

4. a middle locking device; 41. a latch lock lever; 42. a plug pin receiving seat; 43. a hydraulic tow bar;

5. a bridge steel structure; 51. a counterweight segment; 511. a weight box; 52. a bearing section; 521. a rotating shaft assembly; 522. an oil cylinder upper support; 523. the front support supports the upper support; 524. a bridge deck; 53. a cantilever section; 54. a main stringer; 55. a main cross beam; 56. a secondary stringer; 57. a secondary cross beam; 58. horizontal diagonal bracing; 59. a sidewalk.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that the terms "disposed," "connected," "fixed," and the like are used in a broad sense, and for example, the terms "disposed," "connected," and "fixed" may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The meaning of "plurality" is two or more unless specifically limited otherwise. The terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Referring to fig. 1 to 3, the present embodiment provides a double-blade vertical rotation type open bridge, which includes two symmetrical single-side bridge bodies, each single-side bridge body includes a bridge pier 1, a bearing seat 2, a hydraulic cylinder 3, a middle locking device 4, and a bridge steel structure 5, and the bearing seats 2 and the hydraulic cylinders 3 are disposed between the bridge steel structure 5 and the bridge pier 1. The bridge steel structure 5 is formed by splicing a counterweight section 51, a bearing section 52 and a cantilever section 53. The bearing section 52 is rotationally connected with the pier 1 through the bearing seat 2, the movable end of the hydraulic oil cylinder 3 is fixed with the bearing section 52, the fixed end of the hydraulic oil cylinder 3 is fixed with the pier 1, the hydraulic oil cylinder 3 drives the bridge steel structure 5 to rotate along the bearing seat 2, the opening and closing of the unilateral bridge are realized, and the opening angle of the unilateral bridge is 75 degrees. The middle locking device 4 is arranged at the front end of the cantilever section 53, and the middle locking device 4 is used for centering and locking two single-side bridge bodies. The bridge steel structure 5 is formed by splicing the counterweight section 51, the bearing section 52 and the cantilever section 53, and when the bridge steel structure 5 is installed, the counterweight section 51, the bearing section 52 and the cantilever section 53 are installed in sections, so that the hoisting weight and the volume of a single component can be reduced, the smooth construction of opening a bridge is ensured, and the influence on the passage of a channel can be reduced to the greatest extent.

Referring to fig. 4, in the present embodiment, the counterweight segment 51 includes a first segment, the bearing segment 52 includes a second segment, the cantilever segment 53 includes a third segment and a fourth segment, the first segment, the second segment, the third segment and the fourth segment are sequentially spliced together, and adjacent segments are connected by bolts to form the bridge steel structure 5. The counterweight segment 51, the bearing segment 52 and the cantilever segment 53 all comprise three main longitudinal beams 54 (two side longitudinal beams and one middle longitudinal beam) which are arranged at intervals and have I-shaped cross sections, a plurality of main cross beams 55 which are arranged at intervals and have I-shaped cross sections are arranged between every two adjacent main longitudinal beams 54, a plurality of secondary longitudinal beams 56 which are arranged at intervals are arranged at the top between every two adjacent main cross beams 55, a plurality of secondary cross beams 57 which are arranged at intervals are arranged between every two adjacent secondary longitudinal beams 56, and horizontal inclined struts 58 are arranged at the bottoms of the main longitudinal beams 54 between every two adjacent main cross beams 55. The counterweight section 51, the bearing section 52 and the cantilever section 53 form a stable bridge steel structure 5 through the main longitudinal beam 54, the main cross beam 55, the secondary longitudinal beam 56, the secondary cross beam 57 and the horizontal inclined strut 58; a cavity is formed among the secondary longitudinal beam 56, the secondary cross beam 57 and the horizontal inclined strut 58, an access passage can be arranged in the cavity, and a hole capable of allowing people to walk is formed in the main cross beam 55 corresponding to the access passage, so that enclosure and management in the later period of the locking device 4 in the middle of the bridge can be conveniently opened; meanwhile, the main longitudinal beam 54 of the bridge steel structure 5 is manufactured and installed in a segmented mode, and transportation and field installation of the main longitudinal beam 54 are facilitated.

Sidewalks 59 are arranged on two sides of the side longitudinal beams, and the sidewalks 59 can be used for pedestrians to walk across the bridge in the open-bridge closed state.

A weight box 511 is arranged between the tail ends of two adjacent main longitudinal beams 54 of the weight section 51, and the weight box 511 is used for adjusting the gravity center position of the unilateral bridge body, so that the jacking force of the hydraulic oil cylinder is greatly reduced in the opening process of the unilateral bridge body. A bearing seat 2 and a hydraulic oil cylinder 3 are arranged between each main longitudinal beam 54 of the bearing section 52 and the pier 1, each main longitudinal beam 54 of the bearing section 52 is connected with the corresponding bearing seat 2 through a rotating shaft assembly 521, and each main longitudinal beam 54 of the bearing section 52 is connected with the movable end of the corresponding hydraulic oil cylinder 3 through an oil cylinder upper support 522. By arranging the bearing seat 2 and the hydraulic oil cylinder 3 at the bottom of each main longitudinal beam 54 of the bearing section 52, after one hydraulic oil cylinder 3 is damaged, the remaining hydraulic oil cylinder 3 can also continue to open and close the single-side bridge body, so that the single-side bridge body can be normally opened and closed.

Referring to fig. 3 and 5, a front support upper support 523 is disposed at the bottom of each main longitudinal beam 54 of the bearing segment 52, and the cylinder upper support 522 is located between the front support upper support 523 and the rotating shaft assembly 521, and serves as an upper fulcrum for the hydraulic cylinder 3 to lift the main longitudinal beam 54 to open. The top of the front end of the pier 1 is provided with a plurality of front support lower supports 11 matched with the front support upper supports 523, when the unilateral bridge body is in a closed state, each front support upper support 523 is in contact with the corresponding front support lower support 11, and the front support upper supports 523 and the front support lower supports 11 play a role in supporting the unilateral bridge body.

Referring to fig. 1, 3 and 5, in this embodiment, the pier 1 includes a main pier bearing platform 12 and a main pier chamber 13 disposed on the main pier bearing platform 12, a bearing seat steel support 14 and a cylinder lower support 15 are disposed in the main pier chamber 13, a bearing seat 2 is fixed on the top of the bearing seat steel support 14 through a bearing seat cross beam 16, a fixed end of the hydraulic cylinder 3 is connected with the cylinder lower support 15, a front support lower support 11 is disposed on the top of a shear wall at the front end of the main pier chamber 13, and the cylinder lower support 15 is located between the bearing seat steel support 14 and the front support lower support 11 and serves as a lower fulcrum for opening the main longitudinal beam 54 lifted by the hydraulic cylinder 3.

Referring to fig. 3, fixed bridge plates 17 are arranged on the tops of the shear walls on the two sides of the main pier box chamber 13, the counterweight section 51 is located right below the fixed bridge plates 17, an approach bridge 18 is arranged at the rear end of the main pier box chamber 13, the approach bridge 18 is flush with the fixed bridge plates 17, the tops of the bearing section 52 and the cantilever section 53 are flush, the tops of the bearing section 52 and the cantilever section 53 are higher than the top of the counterweight section 51, bridge decks 524 are arranged on the tops of the bearing section 52 and the cantilever section 53, the fixed bridge plates 17 are used for connecting the approach bridge 18 and the bridge decks 524, and when the unilateral bridge body is in a closed state, the bridge decks 524 are flush with the fixed bridge plates 17.

Referring to fig. 6, in the present embodiment, the middle locking device 4 includes a latch lock lever 41 and a latch receiver 42, the latch lock lever 41 is installed at the front end of one of the unilateral bridge bodies, the latch receiver 42 is installed at the front end of the other unilateral bridge body, and when the open bridge is closed, the latch lock lever 41 is inserted into the latch receiver 42 through a hydraulic tow bar 43, so as to lock the two unilateral bridge bodies in a centered manner.

On the other hand, referring to fig. 7, the present invention provides a construction method of the above-mentioned double-blade vertical rotation type open bridge, including the following steps:

step S1: and (4) installing a crane track platform at the first section of the north bridge and a crane track platform bracket at the lower part.

In this embodiment, set up the handling frame at north bridge owner mound indoor, carry out the installation of north bridge lower part crane rail platform support, the steel-pipe column basis location of handling frame must be accurate with the installation straightness that hangs down, and avoids the pontic steel construction, avoids lower part crane rail platform support to produce the influence to the installation of pontic steel construction. Meanwhile, as the size of the components such as the counterweight box module, the bearing section beam, the internal maintenance steel platform and the like is large, the components need to be hoisted and stacked on the lower crane track platform support before the installation of the upper crane track platform, and the temporary support and the beam for installing the counterweight box module are designed at the corresponding position of the lower crane track platform support.

The first crane track platform of the north bridge comprises a first Bailey beam steel platform and a triangular slope frame which are sequentially erected on a prestressed concrete approach bridge deck, wherein the triangular slope frame is welded by UB 305X 118kg/m section steel, the slope angle is 10 degrees, and the surface of the triangular slope frame is subjected to anti-skid treatment. Because the angle between the plane of the triangular slope frame and the first section of the Bailey beam steel platform is larger, the big arm has larger fall when the crawler crane goes up and down the slope to carry out platform conversion at the corner. In order to ensure that the crawler crane can walk stably on the upper platform and the lower platform, no-counterweight no-load walking is adopted when the crawler crane goes on the upper platform, no-load walking with counterweight is adopted when the crawler crane goes down on the lower platform, and the first section of the Bailey beam steel platform and the lower part of the triangular slope frame are welded and fixed with the anchoring points of the bridge approach concrete bridge deck embedded parts through small steel fixing parts. Meanwhile, under the working conditions of walking and hoisting of the crawler crane, the load on the bridge deck is large, the rechecking result needs to be calculated according to the structure, and the local concrete structure is reinforced and reinforced during the construction of the approach bridge structure.

Step S2: and (4) installing a north bridge bearing seat and a hydraulic oil cylinder.

In this embodiment, the bearing seat, the hydraulic oil cylinder and the steel support thereof are respectively transported to the first-section beret beam steel platform through the approach bridge for installation. After the bearing seat and the steel support thereof are installed, precision calibration needs to be carried out, and bolts need to be fastened; and carrying out surface covering protection after the hydraulic cylinder is temporarily fixed.

Step S3: and (5) installing a crane track platform at the upper part of the north bridge.

In this embodiment, the crane rail platform on the upper portion of the north bridge comprises a bailey beam steel platform, the bailey beam steel platform is installed on the crane rail platform support on the lower portion, and the bailey beam steel platform is higher than the elevation of the bridge deck of the open bridge, so that the bailey beam steel platform is prevented from influencing the installation of the steel structure of the bridge body. And the counterweight box module, the bearing section main beam and other members are placed below the lower crane track platform support beam and penetrate through the Bailey beam steel platform.

Step S4: and (4) installing a bearing section, a counterweight section and a cantilever section of the north bridge.

In this embodiment, step S4 specifically includes the following steps:

step S41: and (5) installing a north bridge bearing section. In particular, the method comprises the following steps of,

1) the north bridge bearing section comprises a second section, a middle longitudinal beam of the second section is hoisted on a first preset station of a crane track platform at the first section, a front support temporary support and a jack are installed and adjusted, the front end of the middle longitudinal beam is placed on the upper surface of the front support temporary support, the position of the middle longitudinal beam is slowly adjusted at the rear end of the middle longitudinal beam, the center line of the middle longitudinal beam is kept coincident with the center of a trunnion support, and the middle longitudinal beam is safely and nondestructively placed in a precisely calibrated bearing seat. Adjusting a jack, installing a weighing sensor between the lower front support and the upper front support, and dismantling the temporary support of the front support after rechecking the axis elevation of the longitudinal beam.

2) Hoisting the main cross beam on a second preset station of the crane of the first section crane track platform, transferring the main cross beam from the side surface of the first section crane track platform, translating one end of the main cross beam to the middle longitudinal beam, hoisting and transferring the side longitudinal beam, adjusting the elevation axis, and then connecting and fixing the main cross beam.

3) And (3) installing a main cross beam and a side longitudinal beam on the other side at a second preset station of the crane of the first section of the crane track platform by adopting the same method, and connecting and fixing the main cross beam and the side longitudinal beam after calibration to form a main frame of a second section.

Step S42: and (4) installing a north bridge counterweight section. Specifically, the north bridge counterweight section comprises a first section, the rear end of a main longitudinal beam of the first section is erected on a temporary main longitudinal beam support, and the front end of the main longitudinal beam is connected with a main longitudinal beam bolt of a second section. The counterweight box module is fixedly connected with the main longitudinal beam and the cross beam at the rear end of the first section to form a counterweight box, and a counterweight box temporary support is installed at the bottom of the counterweight box.

Step S43: and (4) mounting a cantilever section of the north bridge. Specifically, the cantilever section of the north bridge comprises a third section and a fourth section, and the front end of a main longitudinal beam of the third section exceeds the channel, so that the river course navigation limitation is performed during the hoisting of the members of the third section and the fourth section, and a warning buoy is made. After the components of the third section and the fourth section are installed and fixed, warning lamps are installed at the end parts and the bottom parts of the components, and night illumination is well performed. And after the third section is installed, the first counterweight concrete pouring is required, the counterweight concrete pouring amount is determined after the gravity center calculation, the data and the theoretical deviation value of the weighing sensor are rechecked before and after the pouring, and the installation quantity of the next component is analyzed and adjusted. Wherein, secondary structures such as the middle isolation belt, the sidewalk and the internal maintenance platform are synchronously installed with the main structure.

Step S5: paving the bridge deck of the north bridge and debugging the unilateral bridge body of the north bridge.

Referring to fig. 8, in the present embodiment, step S5 specifically includes:

step S51: and (5) dismantling the crane rail platform at the upper part of the north bridge. Specifically, the installation of the north bridge body structure is completed, the Bailey beam steel platform at the upper part is dismantled, the crane track platform at the first section is dismantled, and the Bailey beam steel platform is transferred to the south bank. And after the platform of the first crane track is dismantled, carrying out second-time counterweight concrete pouring, determining the counterweight concrete pouring amount after gravity center calculation, and rechecking the data of the weighing sensor and the theoretical deviation value before and after pouring.

Step S52: and (5) dismantling a crane rail platform support at the lower part of the north bridge. Specifically, after the second-time counterweight concrete pouring, the lower crane track platform support is dismantled.

Step S53: paving the north bridge deck concrete. Specifically, after a crane track platform support at the lower part is removed, the concrete pavement construction of the north bridge deck is carried out, when the concrete is poured, the two-way lane of the bridge deck is symmetrically poured from the midspan to the direction of a bearing seat, wherein 1m of the end part of the bridge is reserved for not pouring, the two-way lane is used for elevation adjustment when the south bridge and the north bridge are closed, and the maintenance is carried out after the pouring is finished. And finally, performing third concrete counterweight pouring according to the gravity center calculation result, perfecting the installation of the hydraulic oil cylinder and the hydraulic control system, and removing the temporary support of the counterweight box.

Step S54: and debugging the unilateral bridge body of the north bridge. Specifically, when the bridge deck concrete meets the design strength requirement, debugging of the unilateral bridge body of the north bridge is started.

Step S6: and a crane rail platform bracket at the lower part of the south bridge and the crane rail at the first section are installed flatly.

In this embodiment, a handling frame is installed indoors in the south bridge main pier, and the south bridge lower crane rail platform bracket is mounted. And after the lower crane track platform bracket is installed, transferring the Bailey beam steel platform of the north bridge to the south bank, and horizontally installing the crane track at the first section of the south bridge.

Step S7: and mounting a south bridge bearing seat and a hydraulic oil cylinder.

Step S8: and (5) installing a crane rail platform on the upper part of the south bridge.

Step S9: and (5) mounting a bearing section, a counterweight section and a cantilever section of the south bridge.

In this embodiment, considering navigation, the south bridge suspends the hoisting before being installed in the third segment. After the debugging of the bridge unilateral bridge body is completed, the installation of the third section and the fourth section of the south bridge can be started. The north bridge keeps a daily openable state, and single bridge opening and closing are carried out according to the passage requirement of the channel ships until the debugging of the south bridge single-side bridge body.

Step S10: paving the south bridge deck and debugging the south bridge unilateral bridge body.

Referring to fig. 9, in the present embodiment, step S10 specifically includes:

step S101: and (5) dismantling the crane rail platform on the upper part of the south bridge.

Step S102: and (5) dismantling a crane rail platform bracket at the lower part of the south bridge.

Step S103: and paving the south bridge deck concrete.

Step S104: and debugging the south bridge single-side bridge body.

Step S11: and (4) carrying out combined debugging on the south bridge and the north bridge and installing a middle locking device.

In the embodiment, according to the passing time characteristics of the large ships, the navigation time period is mastered and controlled, and the united debugging of the north bridge and the south bridge is carried out. During the north-south bridge commissioning process, installation of the central locking device is performed. 4 sets of middle locking devices are arranged on the full bridge, and when the opening bridge is closed, the lock rods of the unilateral bridge bodies on the south and north sides are inserted into the receiving seat through the hydraulic push rods. In each stage of the installation of the north-south bridge structure, the axis deviation of the bridge body can be measured and adjusted, and after the structure is installed, the axis deviation is 2mm through repeated measurement, so that higher accuracy is achieved. However, due to the influence of factors such as bridge span stress deformation, temperature difference and machining error, uncertainty exists in elevation centering after the bridge is opened on two sides and installed. The accurate closure of the bridge body is ensured through 2 steps of coarse adjustment and fine adjustment of the elevation difference:

(1) the elevation of the front support lower support is accurately adjusted through the adjusting base plate, the front support lower support is tightly attached to the front support upper support, the midspan deviation is adjusted to 10mm, then the installation of a midspan finger-shaped expansion joint and the concrete pouring of a reserved bridge deck adjusting section are carried out, and the distribution of the weight box black cast iron movable balancing weights is completed.

(2) The locking rod part is fixedly installed with the north-south bridge body structure in advance, when the north-south bridge body structure is in a normal closing state, the locking rod is opened to carry out bolt seat, accurate positioning, hole making and receiving seat installation are carried out on site, and accurate centering is achieved.

The invention adopts the independent construction method of the north-south bridge, after the installation of the unilateral bridge body and the debugging are finished, the bridge body is opened, and the other half bridge body is installed, thereby reducing the influence on the passage of a channel, mastering and controlling the navigation time period according to the passage time characteristics of large ships, and carrying out the full-bridge combined debugging; by erecting the crane rail steel platform in the opening bridge main pier box chamber and adopting the crawler crane cantilever assembling construction method, the weight and the size of a single hoisting member are reduced, large-scale special equipment is not needed, the smooth implementation of a project is ensured, the influence on the passage of a navigation channel is reduced to the maximum extent, and good economic benefit and social benefit are obtained.

Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

The invention is described above with reference to the accompanying drawings, which are illustrative, and it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other fields without modification.