阅读说明：本技术 一种线正下式站房有限空间大跨度钢结构提升施工工法 (Line-straight-down type station room limited space large-span steel structure lifting construction method ) 是由 张军 刘玉龙 范利君 张斌 王辉 李岩 刘玲 于 2021-10-14 设计创作，主要内容包括：本发明公开了一种线正下式站房有限空间大跨度钢结构提升施工工法,涉及钢结构建筑施工技术领域。本发明工法的具体步骤如下：步骤1：现场拼装,步骤2：设计制作提升工装,步骤3：安装提升工装。本发明通过设计的通用性,适用于各类由于施工场地狭小、作业空间有限,满足传统液压起重设备吊装的钢结构安装工程,且通过设计的严谨性,提升工装提升受力情况经有限元分析软件计算分析,确定其结构设计合理,原材料规格、电动提升机额定功率选型偏大,安全储备高,且通过设计的可操作性,使用钢板、工字钢等常规材料设计、制作提升工装及其它辅助措施完成钢构件的安装,工艺原理易懂,施工方法简单,可操作性强。(The invention discloses a line direct-type station room limited space large-span steel structure lifting construction method, and relates to the technical field of steel structure building construction. The method comprises the following specific steps: step 1: assembling on site, and step 2: designing and manufacturing a lifting tool, and step 3: and (5) installing a lifting tool. The invention is suitable for various steel structure installation projects of hoisting of traditional hydraulic hoisting equipment due to narrow construction site and limited operation space through the universality of design, and the hoisting stress condition of the hoisting tool is calculated and analyzed by finite element analysis software through the rigidness of the design, so that the structural design is determined to be reasonable, the specification of raw materials and the rated power of the electric hoist are selected to be larger, the safety reserve is high, the installation of a steel member is completed by using conventional materials such as steel plates, I-shaped steel and the like to design, manufacture the hoisting tool and other auxiliary measures through the operability of the design, the process principle is easy to understand, the construction method is simple, and the operability is strong.)

1. A line-straight-type station room finite space large-span steel structure lifting construction method is characterized in that: the construction method comprises the following specific steps:

step 1: assembling on site;

step 2: designing and manufacturing a lifting tool;

and step 3: installing a lifting tool;

and 4, step 4: lifting the roof truss beam;

and 5: monitoring the process;

step 6: and adjusting and welding the bracket.

2. The line-straight-type station room limited space large-span steel structure lifting construction method according to claim 1, is characterized in that: the step 1 comprises the following steps:

the first step is as follows: the method comprises the following steps of finishing concrete hardening treatment on the ground, keeping the ground level and bearing capacity, leveling the ground level and having good bearing capacity, arranging an assembling jig frame at the ground orthographic projection position of a steel beam installation station, arranging the jig frame and the steel beam vertically, using a total station to discharge the central axis of a roof truss beam on the ground when arranging the jig frame, leveling a level, fixing the jig frame and the ground by using expansion bolts, arranging two groups of jig frames below each steel beam, placing an anti-seismic spherical hinge support on the surface of an upper flange plate of a steel bracket, temporarily not connecting the anti-seismic spherical hinge support with the steel bracket, and leveling the steel bracket by using a bracket;

the second step, the steel beam is transported to the installation site in sections, the beam transporting vehicle runs to the position below the viaduct, the steel beam is unloaded to the assembling jig frame by using an automobile crane, the end head of the steel beam is directly placed on the anti-seismic spherical hinge support, and the upper surface of the anti-seismic spherical hinge support and the lower flange plate of the steel beam are welded;

the third step: adjusting the dislocation of the interface section of the steel beam to ensure that the dislocation of the interface section of the steel beam is less than or equal to 2mm, adjusting the distance of the mounting holes at the two ends of the outermost side of the steel beam to ensure that the distance of the mounting holes at the two ends is +/-3 mm, and setting the camber to be +/-1/5000;

the fourth step: use the angle steel to link into whole with steel corbel and girder steel, stand and the welding of steel corbel top wing listrium, use 4 angle steels as the cross-under at girder steel top wing listrium department and link as whole with the stand, the cross-under transfers two round steel as the gyro wheel, welds two 20mm thick steel plates as the baffle in the direction of girder steel length direction in the cross-under outside, and baffle and girder steel single face spot welding prevent that the girder steel corbel from sliding when lifting.

3. The line-straight-type station room limited space large-span steel structure lifting construction method according to claim 2, is characterized in that: the step 3 comprises the following steps:

the first step is as follows: manufacturing and molding the lifting tool on the ground; erecting an operation platform on a pier at an installation station by using scaffold pipes, wherein the steel pipes are vertically arranged at intervals, the overhanging length of each steel pipe is 1m, a steel springboard is laid on each overhanging steel pipe to serve as the operation platform, and a manned ladder is arranged on one side of the platform;

the second step is that: installing a lifting tool by using a truck crane, welding a lifting lug at the position of three quarters downwards at the top of the lifting tool to enable the bottom of the lifted lifting tool to be heavier and the whole lifting tool to be in an eccentric state, adjusting the position of the lifting tool on an operation platform by a constructor to enable the lifting tool to be completely attached to an embedded steel plate and to be vertical to the ground, and finally welding a fillet weld between the lifting tool and the embedded steel plate, wherein the height of the welding fillet is 10 mm;

the third step: and leading the central axis of the steel beam to the pre-buried steel plate of the pier from the ground by using a plumb bob, and drawing the top surface elevation of the steel corbel.

4. The line-straight-type station room limited space large-span steel structure lifting construction method according to claim 1, is characterized in that: the step 4 comprises the following steps:

the first step is as follows: hanging an electric hoist with rated lifting capacity of 15t on a lifting tool lifting lug, connecting the electric hoist with a synchronous control system in series, debugging the system, and checking whether the equipment runs normally, wherein a chain block is lengthened and 10m in length;

the second step is that: mounting a lifting lug at a position corresponding to the upper lifting point of the lifting tool on the upper flange plate of the steel beam as a lower lifting point, and fully penetration welding the lifting lug and the steel beam;

the third step: before lifting, the lifting tool, the electric lifter, the lifting lugs and the connecting nodes are comprehensively checked, welding seams at all positions are guaranteed to be free of welding leakage, the size of a welding corner meets the requirement, the electric lifter is flexible and reliable in operating handle buttons, and the mechanical performance is good;

the fourth step: starting a hoist, hoisting the steel beam to a position 200mm away from the jig frame, standing for 10 minutes, checking the hoisting tool, the electric hoist, the lifting lugs and the connecting nodes again, and continuing hoisting after confirming that no abnormality exists until the steel beam is hoisted to the designed elevation; during the lifting process, a specially-assigned person closely observes the lifting height of the steel beam, and the two ends of the steel beam are ensured to be lifted synchronously.

5. The line-straight-type station room limited space large-span steel structure lifting construction method according to claim 1, is characterized in that: the step 6 comprises the steps of:

the first step is as follows: after the steel beam is lifted to the designed height, pounding off the transverse connection baffle at the side of the pier by using an iron hammer, prying the steel corbel by using a crowbar to enable the steel corbel to slide for 100mm to be attached to the pre-embedded plate of the pier, adjusting the levelness and the elevation of the steel corbel, and fixing the steel corbel and the pre-embedded steel plate of the pier by spot welding;

the second step is that: removing connecting angle steel between the steel bracket and the steel beam, lifting the steel beam upwards by 300mm, leaving enough space for welding a welding seam between the steel bracket and an embedded plate of the pier, and performing full penetration welding on the bracket and the embedded plate; and after welding, placing the steel beam above the bracket support, welding a fillet weld between the spherical hinge support and the steel bracket, and removing the lifting tool and the electric lifter.

Technical Field

The invention relates to the technical field of steel structure building construction, in particular to a line-straight-down type station room limited space large-span steel structure lifting construction method.

Background

The high-speed railway in China has undergone rapid development for 22 years. As an important hub of a railway transportation network system, namely a high-speed railway passenger station house, a new round of construction climax is also met, and the in-line passenger station house is also produced accordingly, namely the station house is positioned right below a railway line viaduct, but the conventional in-line station house limited space large-span steel structure lifting construction method is complex in process principle, complex in construction method and poor in operability.

Disclosure of Invention

The invention aims to provide a line-straight-down type station room limited space large-span steel structure lifting construction method, which aims to solve the existing problems: the existing method for lifting construction of the line under type station house finite space large-span steel structure is complex in process principle, complex in construction method and poor in operability.

In order to achieve the purpose, the invention provides the following technical scheme: a line-straight-down type station room finite space large-span steel structure lifting construction method comprises the following specific steps:

step 1: assembling on site;

step 2: designing and manufacturing a lifting tool;

and step 3: installing a lifting tool;

and 4, step 4: lifting the roof truss beam;

and 5: monitoring the process;

step 6: and adjusting and welding the bracket.

Preferably, the step 1 comprises the steps of:

the first step is as follows: the concrete hardening treatment on the ground is completed, the ground is kept flat and bearing capacity is kept, the ground is flat and good in bearing capacity, the assembling jig frame is arranged at the orthographic projection position of the ground at the steel beam installation station, the assembling jig frame in the embodiment is HW400 x 13 x 21H type steel, the length is 1000mm, other sizes can be adopted in other embodiments, not all the above, the jig frame and the steel beam are arranged vertically, a total station is used for releasing the central axis of the roof beam on the ground when the jig frame is arranged, a leveling instrument is used for leveling, the jig frame and the ground are fixed by using expansion bolts, two groups of jig frames are arranged below each steel beam, the distance between each steel beam in the embodiment is 2000mm, other sizes can be adopted in other embodiments, not all the above, the anti-seismic spherical hinge support is placed on the surface of the flange plate on the steel bracket, the anti-seismic spherical hinge support is not connected with the steel bracket temporarily, the bracket distance between the pier in the embodiment is 100mm, in other embodiments, the bracket can be of other sizes, not all of which are illustrated, and the bracket is used for leveling the steel bracket;

the second step, the steel beam is transported to the installation site in sections, the beam transporting vehicle runs to the position below the viaduct, the steel beam is unloaded to the assembling jig frame by using an automobile crane, the end head of the steel beam is directly placed on the anti-seismic spherical hinge support, and the upper surface of the anti-seismic spherical hinge support and the lower flange plate of the steel beam are welded;

the third step: adjusting the dislocation of the interface section of the steel beam to ensure that the dislocation of the interface section of the steel beam is less than or equal to 2mm, adjusting the distance of the mounting holes at the two ends of the outermost side of the steel beam to ensure that the distance of the mounting holes at the two ends is +/-3 mm, and setting the camber to be +/-1/5000;

the fourth step: the steel bracket and the steel beam are connected into a whole by using angle steel, the upright column is angle 50-4 mm angle steel in the embodiment, the upright column can be in other sizes in other embodiments, the upright column can be welded with an upper wing edge plate of the steel bracket without being listed, 4 angle 50-4 mm angle steel is used at the upper wing edge plate of the steel beam as a transverse link to connect the upright column into a whole, the two pieces of steel are placed in the transverse link and can be in other sizes in other embodiments of phi 30 in the embodiment, the round steel is used as a roller, two 20mm thick steel plates are welded along the length direction of the steel beam outside the transverse link to serve as baffles, and the baffles are spot-welded with the single surface of the steel beam to prevent the steel bracket from sliding when the steel beam is lifted.

Preferably, the step 2 includes that the lifting tool is made of I-steel, the specification of the upright column 1 is HW125 x 6.5 x 9mm, the specification of the upright column 2 and the inclined strut is HW100 x 6 x 8mm, the specification of the cross beam and the corbel is HW125 x 6.5 x 9mm, and the overhanging length of the cross beam is 370 mm; the lifting lug is made of delta 20-180-200 mm steel plates and is welded with the lifting support and the steel beam in a full penetration mode. The lifting tool upright column 1 is welded with the embedded steel plate of the pier, the single welding length is 1400mm, and the welding angle height is 10 mm.

Preferably, the step 3 comprises the steps of:

the first step is as follows: manufacturing and molding the lifting tool on the ground; erecting an operation platform on a pier at an installation station by using scaffold pipes with phi 48 x 3.5mm, vertically arranging steel pipes at an interval of 1.5m or 1.2m, wherein the overhanging length of each steel pipe is 1m, paving a steel springboard on each overhanging steel pipe to serve as the operation platform, and arranging a manned ladder on one side of the platform;

the second step is that: installing a lifting tool by using a 25t truck crane, welding a lifting lug at the position of three quarters downwards at the top of the lifting tool to enable the bottom of the lifted lifting tool to be heavier and to be in an eccentric state as a whole, adjusting the position of the lifting tool on an operation platform by a constructor to enable the lifting tool to be completely attached to an embedded steel plate and to be vertical to the ground, and finally welding a fillet weld between the lifting tool and the embedded steel plate, wherein the welding fillet height is 10 mm;

the third step: and leading the central axis of the steel beam to the pre-buried steel plate of the pier from the ground by using a plumb bob, and drawing the top surface elevation of the steel corbel.

Preferably, the first step: hanging an electric hoist with rated lifting capacity of 15t on a lifting tool lifting lug, connecting the electric hoist with a synchronous control system in series, debugging the system, and checking whether the equipment runs normally, wherein a chain block is lengthened and 10m in length;

the second step is that: mounting a lifting lug (delta 20mm steel plate) as a lower lifting point at a position corresponding to the upper flange plate of the steel beam and the lifting tool, and fully penetration welding the lifting lug and the steel beam;

the assembled steel beam has the weight of 18t (including the weight of a bracket and a spherical hinge support), the stress of a single group of lifting tools and a chain block is 9t, the rated load of an electric lifter is 15t, and the safety factor of 15 ÷ 9 ═ 1.67 is more than 1.2;

the third step: before lifting, the lifting tool, the electric lifter, the lifting lugs and the connecting nodes are comprehensively checked, welding seams at all positions are guaranteed to be free of welding leakage, the size of a welding corner meets the requirement, the electric lifter is flexible and reliable in operating handle buttons, and the mechanical performance is good;

the fourth step: starting a hoist, hoisting the steel beam to a position 200mm away from the jig frame, standing for 10 minutes, checking the hoisting tool, the electric hoist, the lifting lugs and the connecting nodes again, and continuing hoisting after confirming that no abnormality exists until the steel beam is hoisted to the designed elevation; during the lifting process, a specially-assigned person closely observes the lifting height of the steel beam to ensure that two ends of the steel beam are synchronously lifted; and prohibiting all people from entering within the range of 5m of the working radius during lifting.

Preferably, step 5 is:

before lifting, two ends of the steel beam are respectively provided with a prism, and the total station is erected at a position 10m away from the steel beam, so that the prisms are still visible after the steel beam is lifted to a design height; the method comprises the steps of using a total station instrument to look at known measurement control points before lifting, measuring to obtain the elevations of two ends of a steel beam, confirming that the steel beam is in a horizontal state, after the lifting is started, pausing the lifting after the steel beam is lifted by 1.5m, using the total station instrument to measure the elevations of two ends of the steel beam, ensuring that the steel beam is always in a horizontal state, and timely using a synchronous control system to finely adjust a single electric hoist if the elevation difference occurs at two ends of the steel beam, so as to ensure that the steel beam is synchronously lifted.

Preferably, the step 6 comprises the steps of:

the first step is as follows: after the steel beam is lifted to the designed height, pounding off the transverse connection baffle at the side of the pier by using an iron hammer, prying the steel corbel by using a crowbar to enable the steel corbel to slide for 100mm to be attached to the pre-embedded plate of the pier, adjusting the levelness and the elevation of the steel corbel, and fixing the steel corbel and the pre-embedded steel plate of the pier by spot welding;

the second step is that: removing connecting angle steel between the steel bracket and the steel beam, lifting the steel beam upwards by 300mm, leaving enough space for welding a welding seam between the steel bracket and an embedded plate of the pier, and performing full penetration welding on the bracket and the embedded plate; and after welding, placing the steel beam above the bracket support, welding a fillet weld between the spherical hinge support and the steel bracket, and removing the lifting tool and the electric lifter.

Compared with the prior art, the invention has the beneficial effects that:

1. through the universality of the design, the hydraulic lifting device is suitable for various steel structure installation projects which meet the hoisting requirements of the traditional hydraulic lifting equipment due to narrow construction sites and limited operation space;

2. through the rigidness of the design, the lifting stress condition of the lifting tool is calculated and analyzed by finite element analysis software, the structural design is determined to be reasonable, the specification of raw materials and the rated power selection of the electric lifter are larger, the safety reserve is high,

3. according to the invention, the installation of the steel member is completed by using conventional materials such as steel plates, I-beams and the like to design, manufacture and lift tools and other auxiliary measures through the design operability, the process principle is easy to understand, the construction method is simple, and the operability is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of the present invention as a whole;

FIG. 2 is a first schematic of the present invention in field assembly;

FIG. 3 is a second schematic of the field assembly of the present invention;

FIG. 4 is a third schematic of the field assembly of the present invention;

FIG. 5 is a fourth schematic view of the field assembly of the present invention;

FIG. 6 is a fifth schematic view of the present invention in field assembly;

FIG. 7 is a first schematic view of a lifting tool designed and manufactured in accordance with the present invention;

FIG. 8 is a second schematic view of a lifting tool designed and manufactured in accordance with the present invention;

FIG. 9 is a third schematic view of a lifting tool designed and manufactured in accordance with the present invention;

FIG. 10 is a fourth schematic view of a lifting tool designed and manufactured in accordance with the present invention;

FIG. 11 is a first schematic view of the present invention illustrating the installation of a lifting tool;

FIG. 12 is a second schematic view of the present invention illustrating the installation of a lifting tool;

FIG. 13 is a first schematic view of a tuning, welding corbel of the present invention;

FIG. 14 is a second schematic view of a tuning, welding corbel of the present invention;

FIG. 15 is a third schematic view of a trim, weld bracket according to the present invention;

FIG. 16 is a fourth schematic view of the present invention for adjusting and welding the corbel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Please refer to fig. 1:

a line-straight-type station room finite space large-span steel structure lifting construction method comprises the following specific steps:

step 1: assembling on site;

step 2: designing and manufacturing a lifting tool;

and step 3: installing a lifting tool;

and 4, step 4: lifting the roof truss beam;

and 5: monitoring the process;

step 6: and adjusting and welding the bracket.

Please refer to fig. 2-6:

the step 1 comprises the following steps:

the first step is as follows: the concrete hardening treatment on the ground is completed, the ground is kept flat and bearing capacity is kept, the ground is flat and good in bearing capacity, the assembling jig frame is arranged at the orthographic projection position of the ground at the steel beam installation station, the assembling jig frame in the embodiment is HW400 x 13 x 21H type steel, the length is 1000mm, other sizes can be adopted in other embodiments, not all the above, the jig frame and the steel beam are arranged vertically, a total station is used for releasing the central axis of the roof beam on the ground when the jig frame is arranged, a leveling instrument is used for leveling, the jig frame and the ground are fixed by using expansion bolts, two groups of jig frames are arranged below each steel beam, the distance between each steel beam in the embodiment is 2000mm, other sizes can be adopted in other embodiments, not all the above, the anti-seismic spherical hinge support is placed on the surface of the flange plate on the steel bracket, the anti-seismic spherical hinge support is not connected with the steel bracket temporarily, the bracket distance between the pier in the embodiment is 100mm, in other embodiments, the bracket can be of other sizes, not all of which are illustrated, and the bracket is used for leveling the steel bracket;

the second step, the steel beam is transported to the installation site in sections, the beam transporting vehicle runs to the position below the viaduct, the steel beam is unloaded to the assembling jig frame by using an automobile crane, the end head of the steel beam is directly placed on the anti-seismic spherical hinge support, and the upper surface of the anti-seismic spherical hinge support and the lower flange plate of the steel beam are welded;

the third step: adjusting the dislocation of the interface section of the steel beam to ensure that the dislocation of the interface section of the steel beam is less than or equal to 2mm, adjusting the distance of the mounting holes at the two ends of the outermost side of the steel beam to ensure that the distance of the mounting holes at the two ends is +/-3 mm, and setting the camber to be +/-1/5000;

the fourth step: the steel bracket and the steel beam are connected into a whole by using angle steel, the upright column is angle 50-4 mm angle steel in the embodiment, the upright column can be in other sizes in other embodiments, the upright column can be welded with an upper wing edge plate of the steel bracket without being listed, 4 angle 50-4 mm angle steel is used at the upper wing edge plate of the steel beam as a transverse link to connect the upright column into a whole, the two pieces of steel are placed in the transverse link and can be in other sizes in other embodiments of phi 30 in the embodiment, the round steel is used as a roller, two 20mm thick steel plates are welded along the length direction of the steel beam outside the transverse link to serve as baffles, and the baffles are spot-welded with the single surface of the steel beam to prevent the steel bracket from sliding when the steel beam is lifted.

Please refer to fig. 7-10:

step 2:

the lifting tool is made of I-shaped steel, the specification of the upright column 1 is HW125 x 6.5 x 9mm, the specification of the upright column 2 and the inclined strut is HW100 x 6 x 8mm, the specification of the cross beam and the corbel is HW125 x 6.5 x 9mm, and the overhanging length of the cross beam is 370 mm; the lifting lug is made of delta 20-180-200 mm steel plates and is welded with the lifting support and the steel beam in a full penetration mode. The lifting tool upright column 1 is welded with the embedded steel plate of the pier, the single welding length is 1400mm, and the welding angle height is 10 mm.

Please refer to fig. 11-12:

the step 3 comprises the following steps:

the first step is as follows: manufacturing and molding the lifting tool on the ground; erecting an operation platform on a pier at an installation station by using scaffold pipes with phi 48 x 3.5mm, vertically arranging steel pipes at an interval of 1.5m or 1.2m, wherein the overhanging length of each steel pipe is 1m, paving a steel springboard on each overhanging steel pipe to serve as the operation platform, and arranging a manned ladder on one side of the platform;

the second step is that: installing a lifting tool by using a 25t truck crane, welding a lifting lug at the position of three quarters downwards at the top of the lifting tool to enable the bottom of the lifted lifting tool to be heavier and to be in an eccentric state as a whole, adjusting the position of the lifting tool on an operation platform by a constructor to enable the lifting tool to be completely attached to an embedded steel plate and to be vertical to the ground, and finally welding a fillet weld between the lifting tool and the embedded steel plate, wherein the welding fillet height is 10 mm;

the third step: and leading the central axis of the steel beam to the pre-buried steel plate of the pier from the ground by using a plumb bob, and drawing the top surface elevation of the steel corbel.

Step 4 comprises the steps of:

the first step is as follows: hanging an electric hoist with rated lifting capacity of 15t on a lifting tool lifting lug, connecting the electric hoist with a synchronous control system in series, debugging the system, and checking whether the equipment runs normally, wherein a chain block is lengthened and 10m in length;

the second step is that: mounting a lifting lug (delta 20mm steel plate) as a lower lifting point at a position corresponding to the upper flange plate of the steel beam and the lifting tool, and fully penetration welding the lifting lug and the steel beam;

the assembled steel beam has the weight of 18t (including the weight of a bracket and a spherical hinge support), the stress of a single group of lifting tools and a chain block is 9t, the rated load of an electric lifter is 15t, and the safety factor of 15 ÷ 9 ═ 1.67 is more than 1.2;

the third step: before lifting, the lifting tool, the electric lifter, the lifting lugs and the connecting nodes are comprehensively checked, welding seams at all positions are guaranteed to be free of welding leakage, the size of a welding corner meets the requirement, the electric lifter is flexible and reliable in operating handle buttons, and the mechanical performance is good;

the fourth step: starting a hoist, hoisting the steel beam to a position 200mm away from the jig frame, standing for 10 minutes, checking the hoisting tool, the electric hoist, the lifting lugs and the connecting nodes again, and continuing hoisting after confirming that no abnormality exists until the steel beam is hoisted to the designed elevation; during the lifting process, a specially-assigned person closely observes the lifting height of the steel beam to ensure that two ends of the steel beam are synchronously lifted; and prohibiting all people from entering within the range of 5m of the working radius during lifting.

Step 5 is as follows:

before lifting, two ends of the steel beam are respectively provided with a prism, and the total station is erected at a position 10m away from the steel beam, so that the prisms are still visible after the steel beam is lifted to a design height; the method comprises the steps of using a total station instrument to look at known measurement control points before lifting, measuring to obtain the elevations of two ends of a steel beam, confirming that the steel beam is in a horizontal state, after the lifting is started, pausing the lifting after the steel beam is lifted by 1.5m, using the total station instrument to measure the elevations of two ends of the steel beam, ensuring that the steel beam is always in a horizontal state, and timely using a synchronous control system to finely adjust a single electric hoist if the elevation difference occurs at two ends of the steel beam, so as to ensure that the steel beam is synchronously lifted.

Please refer to fig. 13-16:

the step 6 comprises the following steps:

the first step is as follows: after the steel beam is lifted to the designed height, pounding off the transverse connection baffle at the side of the pier by using an iron hammer, prying the steel corbel by using a crowbar to enable the steel corbel to slide for 100mm to be attached to the pre-embedded plate of the pier, adjusting the levelness and the elevation of the steel corbel, and fixing the steel corbel and the pre-embedded steel plate of the pier by spot welding;

the second step is that: removing connecting angle steel between the steel bracket and the steel beam, lifting the steel beam upwards by 300mm, leaving enough space for welding a welding seam between the steel bracket and an embedded plate of the pier, and performing full penetration welding on the bracket and the embedded plate; and after welding, placing the steel beam above the bracket support, welding a fillet weld between the spherical hinge support and the steel bracket, and removing the lifting tool and the electric lifter.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.