Integral hoisting and dismantling method for hollow slab girder bridge section with anti-collision wall

Abstract

The invention relates to an integral hoisting and dismantling method for a hollow slab girder bridge section with an anti-collision wall. The integral hoisting and dismantling method at least comprises the steps of preparing a special hoisting tool, locally cutting the anti-collision wall, installing the special hoisting tool and calculating the hoisting gravity center. The special lifting appliance is a tau-shaped lifting appliance and comprises a main plate, a web plate and a stiffening plate; the main plate is tau-shaped and comprises main plates on the two sides and a main plate on the middle layer, connecting holes which are continuously and uniformly distributed are formed in the same positions of the main plates, and the main plates are welded into a whole through stiffening plates; the distances are equal; upper beams of the three main plates are all longer than lower beams, the main plates on the two sides are the same in shape, and lug plates with holes are arranged at the ends of the upper beam and the lower beam of the main plate on the middle layer and used for installing anti-inclination connecting pieces; the overall hoisting and dismantling efficiency of the hollow slab beam with the anti-collision wall is effectively improved, the balance stability is good, the abrasion possibility of the steel wire rope is reduced, and the method has more advantages in the aspects of cost saving and safety.

Description

Technical Field

[0001] The invention relates to the field of bridge installation, in particular to a method for integrally hoisting and dismantling a hollow slab beam bridge section with a crashproof wall. Background Art

[0002] Urban interchange reconstruction and expansion projects often have the characteristics of large traffic obstructions and short construction periods, so improving construction efficiency becomes particularly important; in the process of hoisting hollow slab beams, it is crucial to ensure the fixity and accuracy of the lifting points. In the process of dismantling the hollow slab beams of the upper structure, the problem of no fixed lifting points for the beams and the skewed center of gravity of the side beams with anti-collision walls has become a factor restricting the efficiency of dismantling.

[0003] In response to this type of problem, the existing construction methods are mainly split hoisting after removing the crash wall and punching holes to hoist the hollow slab beam side beam with crash wall as a whole. The former has poor construction efficiency, requires many lifting machinery shifts, and has high construction costs. The latter has cumbersome rigging and requires high-altitude machinery to occupy the road for construction cooperation. The rigging is easy to wear and has high safety risks. In the existing technology, there are also studies on special hoists to improve the efficiency of hoisting and dismantling hollow slab beams. Most of them are τ-shaped structures and do not have the adjustment function to meet the requirements of being in a horizontal posture under both empty and loaded conditions. They are mainly suitable for middle beams with relatively uniform texture distribution, and fail to effectively solve the problem of hoisting and dismantling the whole hollow slab beam side beam with crash wall in the same span when the center of gravity is skewed. Summary of the invention

[0004] The present invention aims to overcome the defects of the prior art and provide a method for integrally lifting and dismantling a hollow slab beam bridge section with a crash wall, so as to solve the problem that the old hollow slab beam has no fixed lifting point and the center of gravity of the side beam with a crash wall is skewed.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: A method for integrally lifting and dismantling a hollow slab girder bridge section with a crash barrier is characterized by comprising at least the steps of preparing a special lifting device, partially cutting the crash barrier, installing the special lifting device and calculating the lifting center of gravity.

[0006] The method for integrally lifting and dismantling a hollow slab beam bridge section with a crash wall is characterized in that: the special lifting device is a τ-shaped lifting device, which includes a main plate, a web plate and a stiffening plate; The main board is in a τ shape, and includes two main boards on both sides and a middle main board, all of which have continuous and evenly distributed connection holes at the same position, and are welded together into a whole through stiffening plates; the spacing between each other is equal; the upper beams of the three main boards are all longer than the lower beams, wherein the two main boards have the same shape, and the ends of the upper beam and the lower beam of the middle main board are provided with ear plates with holes for installing anti-tilt connectors; The web plate includes an outer web plate and an inner web plate, which are welded to the outer side and the inner side of the three main boards respectively; The stiffening plates are respectively arranged between the three main boards to connect and reinforce the three main boards.

[0007] The method for overall lifting and dismantling of a hollow slab beam bridge section with a crash barrier is characterized in that it specifically includes the following steps: construction preparation, asphalt milling, removal of bridge deck pavement, local incision of crash barriers, partial removal of hinged joints or wet joints, removal of end joints or expansion joints, positioning of lifting machinery, installation of τ-shaped slings, complete removal of hinged joints or wet joints, lifting and loading, and removal of τ-shaped slings.

[0008] The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall is characterized in that the specific steps of installing the τ-shaped lifting device are as follows: Step 1: According to the hoisting state, the overall center of gravity distribution of the τ-shaped sling and the hoisted object, and the center of gravity distribution of the sling in the unloaded state, determine the position of the connection hole that can maintain the hoisting balance and horizontal posture, and use the center of gravity coordinate method in combination with CAD drawing software for calculation and analysis; Step 2: Install the τ-shaped spreader, connecting module, shackle, and sling in sequence, and hook them on the lifting hook of the lifting machinery. The specifications of the shackle and the sling must be exactly the same, and the slings must not be twisted or knotted; Step 3: The crane arm is rotated back to the installation cutout of the anti-collision wall hanger, and the τ-shaped hanger is slowly lowered. The τ-shaped hanger is installed from the outside through manual support, so that the opening faces inward and is perpendicular to the plate beam to hold the plate beam; Step 4: The lifting machinery is slightly lifted and temporarily lifted, so that the lifting device can bear the local gravity of the plate beam; Step 5: After the hinge joints, end joints, etc. are completely removed, lift them to the bridge deck and install anti-overturning connectors.

[0009] The method for integrally lifting and dismantling a hollow slab beam bridge section with a crash wall is characterized in that: First, determine the mass and center of gravity of each component. Suppose the mass of the entire component to be hoisted is m1 and its center of gravity is (x1, y1).

[0010] Assume the mass of the sling is m2 and the position of its center of gravity is (x2, y2); Second, calculate the center of gravity of the whole: The total mass of the whole system is m total = m1+ m2; Using the center of mass synthesis principle, the center of gravity position of the overall system (x total ,y total ) can be calculated by the following formula: In the x-direction: In the y direction: .

[0011] The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash barrier is characterized in that: a local cutout of the crash barrier includes an end cutout and a hanger installation cutout, the former realizing the disconnection between the lifting span crash barrier and the non-lifting span crash barrier, and the latter providing for the installation of a τ-shaped hanger; The requirements for local cutouts of crash barriers are as follows: The local incision of the crash wall should be completed before hoisting to ensure the continuity of operation and overall efficiency; The end cut should be located at the expansion joint or continuous joint to ensure that the cut is basically flush with the end surface of the plate beam, and the cut depth must be complete without any residual steel bars; The requirements for the installation cutout of the spreader are as follows: The connection between the crash wall and the plate beam should be cut obliquely, that is, the crash wall and the plate beam cantilever should be cut together; To ensure the convenience of installing the τ-type spreader, the width of the cut should be 1.5 times the width of the spreader; The installation cutout of the hanger should be within the range of 1 on the side of the plate beam, and should not be less than the horizontal projection overlap width of the plate beam and the cap beam; When partially cutting the crash barrier, take traction or twisting measures to prevent the cut piece from falling from a high place during the cutting process.

[0012] The method for integrally lifting and dismantling a hollow slab beam bridge section with a crash barrier is characterized in that the outer web and the inner web are both formed by straightening and bending a single steel plate to fit the shape of the main board.

[0013] The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall is characterized in that: it also includes a lifting point module, which is installed on the upper part of the τ-shaped sling and serves to connect the τ-shaped sling and the shackle to avoid the τ-shaped sling being too wide so that the shackle cannot be directly connected and installed with the sling; The lifting point module is composed of two ear plates and a reinforcement ear plate in the middle, which are welded and assembled. When in use, the ear plate of the lifting point module is inserted into the gap between the main boards of the τ-shaped sling and fixed with a pin shaft.

[0014] The method for overall lifting and dismantling of a hollow slab beam bridge section with a crash barrier is characterized in that it also includes an anti-tilt connector, which is a steel wire rope with shackles installed at both ends, which is installed between the perforated ear plates of the upper beam and the lower beam of the middle layer main board to form a closed lifting device structure, which plays an anti-tilt protection role during lifting and prevents the suspended object from slipping due to external interference.

[0015] The method for overall lifting and dismantling of a hollow slab beam bridge section with a crash barrier is characterized in that it also includes a connecting module, which includes two ear plates and a stiffening plate connecting the ear plates. The connecting module is vertically arranged between the τ-shaped hangers and is connected by a pin shaft to achieve structural reinforcement.

[0016] The beneficial effects of the present invention are as follows: It can be seen from the above technical scheme that the present application provides a method for integrally lifting and dismantling a hollow slab beam bridge section with a crash barrier, and the integrally lifting and dismantling of a hollow slab beam with a crash barrier is achieved through an adjustable combined τ-shaped sling. This method has higher construction efficiency and safety than the punching and hanging method of the prior art; the core key lies in the use of the τ-shaped sling, which has the characteristics of combined use and multiple uses, and replaces the hanging and punching method to achieve more efficient and safe integrally lifting and dismantling of hollow slab beams with crash barriers. Compared with the prior art, it has the advantage of flexible adjustment of the center of gravity, and can maintain a horizontal posture both in empty and loaded conditions, and can meet the requirements of the integral lifting and dismantling of hollow slab beams with crash barriers of different degrees of center of gravity deviation. The present invention can also be flexibly used for the integral lifting and installation of prefabricated small box beams with crash barriers with fixed lifting points.

[0017] Compared with the existing technology, it has the following advantages: This method replaces the punching and bag lifting method, and the sling hanging operation is more convenient and efficient; This method does not require the cooperation of climbing machinery occupying the road, and has little impact on existing traffic; This method improves the use environment of the wire rope, reduces the possibility of wear, and reduces the cost of replacing the slings and the safety risk of hoisting; The τ-shaped hanger designed and adopted by the method can be flexibly adjusted according to the degree of eccentricity of the overall center of gravity of the hollow slab beam with anti-collision wall, and can maintain a horizontal balance posture in both empty and loaded conditions, which helps to improve the efficiency of hanging and unhanging the hanger; The τ-shaped hoist designed and adopted in this method is multi-purpose and flexible in combination. It can simultaneously meet the needs of the overall hoisting and dismantling of hollow slab beams with crash barriers and the hoisting and dismantling of hollow slab beams without crash barriers. It is also suitable for the overall hoisting and installation of prefabricated small box beams with crash barriers and the hoisting and installation of prefabricated small box beams without crash barriers. There is no need to replace the lifting rigging during the same span hoisting, and the efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 For the flow chart.

[0019] Figure 2 This is a schematic diagram for determining the overall center of gravity when installing and using a τ-type sling.

[0020] Figure 3 This is a schematic diagram of the installation of a τ-type spreader.

[0021] Figure 4 It is a schematic diagram of the τ-type spreader structure.

[0022] Figure 5 This is a schematic diagram of the motherboard.

[0023] Figure 6Schematic diagram of the outer belly plate.

[0024] Figure 7 Schematic diagram of the inner belly plate.

[0025] Figure 8 A schematic diagram of the connection module.

[0026] Fig. 9 This is a schematic diagram of the use of τ-type sling.

[0027] Fig.10 This is a schematic diagram of the hanging point module. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection requested by the present application. like Figure 1 As shown: A method for overall lifting and dismantling of a hollow slab beam bridge section with a crash barrier, which at least includes the steps of preparing a special lifting device, partially cutting the crash barrier, installing the special lifting device and calculating the lifting center of gravity.

[0029] like Figure 4 , 5 As shown: the special lifting device is a τ-shaped lifting device, which includes a main plate, a web plate and a stiffening plate; The main board is in a τ shape, and includes two main boards 1, 3 on both sides and a middle main board 2, all of which have continuous and evenly distributed connection holes at the same position, and are welded together into a whole through stiffening plates; the spacing between each other is equal; the upper beams of the three main boards are longer than the lower beams, wherein the two main boards have the same shape, and the ends of the upper beam and the lower beam of the middle main board are provided with ear plates with holes for installing anti-tilt connectors; like Figure 6 , 7 As shown: the web includes an outer web and an inner web, which are respectively welded to the outer side and inner side of the three main boards; the outer web and the inner web are both single steel plates that are shaped by correction and bending to fit the shape of the main boards.

[0030] The stiffening plates are respectively arranged between the three main boards to connect and reinforce the three main boards.

[0031] The overall lifting and dismantling method of the hollow slab girder bridge section with crash barrier specifically includes the following steps: construction preparation, asphalt milling, removal of bridge deck pavement, local incision of crash barrier, local removal of hinged joints or wet joints, removal of end joints or expansion joints, positioning of lifting machinery, installation of τ-type hoisting equipment, complete removal of hinged joints or wet joints, lifting and loading onto vehicles, and removal of τ-type hoisting equipment.

[0032] τ-type hoist installation device, first determine the mass and center of gravity position of each component, assume that the overall mass of the component to be hoisted is m1, and its center of gravity position is (x1, y1).

[0033] Assume the mass of the sling is m2 and the position of its center of gravity is (x2, y2); Second, calculate the center of gravity of the whole: The total mass of the whole system is m total = m1+ m2; Using the center of mass synthesis principle, the center of gravity position of the overall system (x total ,y total ) can be calculated by the following formula: In the x direction: In the y direction: .

[0034] Further, such as Fig.10 As shown: it also includes a lifting point module, which is installed on the upper part of the τ-shaped spreader and serves to connect the τ-shaped spreader and the shackle to prevent the τ-shaped spreader from being too wide so that the shackle cannot be directly connected and installed with the spreader; The lifting point module is composed of two ear plates and a reinforcement ear plate in the middle, which are welded and assembled. When in use, the ear plate of the lifting point module is inserted into the gap between the main boards of the τ-shaped sling and fixed with a pin shaft.

[0035] Furthermore, it also includes an anti-tilt connector, which is a steel wire rope with shackles installed at both ends. It is installed between the perforated ear plates of the upper beam and the lower beam of the middle layer main board, so that the lifting device structure is closed, which plays an anti-tilt protection role during lifting and prevents the lifted object from slipping due to external interference.

[0036] Further, such as Figure 8 As shown: it also includes a connecting module, which includes two ear plates and a stiffening plate connecting the ear plates. The connecting module is vertically arranged between the τ-shaped hangers and is connected by a pin shaft to achieve structural reinforcement.

[0037] Process principle The core of this technology lies in the structural design and use of the multi-purpose adjustable combined τ-shaped sling. Its unique structural shape can not only solve the problem of the old hollow slab beam having no fixed lifting points, but also realize the center of gravity adjustment function, so as to maintain the lifting balance and the quick hanging and unhanging of the sling itself. Focusing on the τ-shaped sling, the operation requirements and coordination operations required for the entire lifting process are improved and refined, forming this overall lifting and dismantling construction method of the hollow slab beam with anti-collision wall, which is different from the traditional punching bag lifting method.

[0038] Overall construction process This technology realizes the overall construction process of hoisting and dismantling the hollow slab beam with anti-collision wall, such as Figure 1 As shown, the process flow is basically similar to the existing technology, but there are different operation requirements in the local incision of the crash barrier, the installation of the τ-shaped hanger, and the removal of the τ-shaped hanger, which are the key points of the technology to successfully realize the overall lifting and removal of the hollow slab beam with the crash barrier.

[0039] Furthermore, the local cutouts of the crash wall include end cutouts and hanger installation cutouts, the former realizing the disconnection between the hoisting span crash wall and the non-hoisting span crash wall, and the latter providing for the installation of the τ-shaped hanger; The requirements for local cutouts of crash barriers are as follows: The local incision of the crash wall should be completed before hoisting to ensure the continuity of operation and overall efficiency; The end cut should be located at the expansion joint or continuous joint to ensure that the cut is basically flush with the end surface of the plate beam, and the cut depth must be complete without any residual steel bars; The requirements for the installation cutout of the spreader are as follows: ① The connection between the crash wall and the plate beam should be cut obliquely, that is, the crash wall and the plate beam cantilever should be cut together; ② To ensure the convenience of installation of τ-type spreader, the incision width should be 1.5 times the width of the spreader; ③ The installation cutout of the hanger should be within the range of 1 on the side of the plate beam, and should not be less than the horizontal projection overlap width of the plate beam and the cap beam; ④ When partially cutting off the anti-collision wall, traction or twisting measures should be taken first to prevent the cut pieces from falling from a high place during the cutting process.

[0040] T-type spreader installation The installation steps and operations of τ-type spreaders should be carried out in accordance with the following requirements: Step 1: According to the overall center of gravity distribution of the hoisting device and the hoisted object in the hoisting state, as well as the center of gravity distribution of the hoisting device in the unloaded state, determine the connection hole position that can maintain the hoisting balance and horizontal posture. The center of gravity coordinate method can be used in combination with CAD drawing software for calculation and analysis, such as Figure 2 As shown; Step 2: Install the τ-shaped spreader, connecting module, shackle, and sling in sequence, and hook them on the lifting hook of the lifting machinery. The specifications of the shackle and the sling must be exactly the same, and the slings must not be twisted or knotted; Step 3: The crane arm is rotated back to the installation cutout of the anti-collision wall hanger, and the τ-shaped hanger is slowly lowered. The τ-shaped hanger is installed from the outside through manual support, so that its opening faces inward and is perpendicular to the plate beam to hold the plate beam. Figure 3 As shown; Step 4: The lifting machinery is slightly lifted and temporarily lifted, so that the lifting device can bear the local gravity of the plate beam; Step 5: After the hinge joints, end joints, etc. are completely removed, lift them to the bridge deck and install anti-overturning connectors.

[0041] Removal of τ-type spreader The removal operation of the τ-type spreader is similar to the installation and is a reversible process, but it must be carried out after the loading and anti-overturning measures are completed.

[0042] The use of τ-type spreader: The τ-type sling must be used in combination with the lifting point module, anti-tilt connector, connection module, etc. The use of τ-type slings requires analysis of the sling's own center of gravity when unloaded and the overall center of gravity of the sling and the load when loaded, in order to determine the selection of the best lifting holes; For the overall lifting and removal of the hollow slab beam with anti-collision wall, the τ-shaped lifting device is used in the forward direction to form a scoop lifting relationship; for the overall lifting and installation of the prefabricated small box beam with anti-collision wall, the τ-shaped lifting device is used inverted to form a balanced beam, such as Fig. 9 shown.

[0043] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for integrally lifting and dismantling a hollow slab beam bridge section with a crash wall, characterized in that: The method at least comprises the steps of preparing a special lifting device, partially cutting the anti-collision wall, installing the special lifting device and calculating the lifting center of gravity.

2. The method for integrally lifting and dismantling a hollow slab beam bridge section with a crash wall according to claim 1 is characterized in that: The special lifting device is a τ-shaped lifting device, which includes a main plate, a web plate and a stiffening plate; The main board is in a τ shape, and includes two main boards on both sides and a middle main board, all of which have continuous and evenly distributed connection holes at the same position, and are welded together into a whole through stiffening plates; the spacing between each other is equal; the upper beams of the three main boards are all longer than the lower beams, wherein the two main boards have the same shape, and the ends of the upper beam and the lower beam of the middle main board are provided with ear plates with holes for installing anti-tilt connectors; The webs include an outer web and an inner web, which are welded to the outer sides and inner sides of the three main boards respectively; The stiffening plates are respectively arranged between the three main boards to connect and reinforce the three main boards.

3. A method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 1 or 2, characterized in that Specifically, it includes the following steps: construction preparation, asphalt milling, bridge deck pavement removal, partial incision of crash barriers, partial removal of hinged joints or wet joints, removal of end joints or expansion joints, positioning of lifting machinery, installation of τ-type slings, complete removal of hinged joints or wet joints, lifting and loading, and removal of τ-type slings.

4. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 3 is characterized in that: The specific steps for installing the τ-type spreader are as follows: Step 1: According to the hoisting state, the overall center of gravity distribution of the τ-shaped sling and the hoisted object, and the center of gravity distribution of the sling in the unloaded state, determine the position of the connection hole that can maintain the hoisting balance and horizontal posture, and use the center of gravity coordinate method in combination with CAD drawing software for calculation and analysis; Step 2: Install the τ-shaped spreader, connecting module, shackle, and sling in sequence, and hook them on the lifting hook of the lifting machinery. The specifications of the shackle and the sling must be exactly the same, and the slings must not be twisted or knotted; Step 3: The crane arm is rotated back to the installation cutout of the anti-collision wall hanger, and the τ-shaped hanger is slowly lowered. The τ-shaped hanger is installed from the outside through manual support, so that the opening faces inward and is perpendicular to the plate beam to hold the plate beam; Step 4: The lifting machinery is slightly lifted and temporarily lifted, so that the lifting device can bear the local gravity of the plate beam; Step 5: After the hinge joints, end joints, etc. are completely removed, lift them to the bridge deck and install anti-overturning connectors.

5. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 4 is characterized in that: First, determine the mass and center of gravity of each component. Assume that the mass of the component to be hoisted is m1 and its center of gravity is (x1, y1). Assume the mass of the sling is m2 and the position of its center of gravity is (x2, y2); Second, calculate the center of gravity of the whole: The total mass of the whole system is m total = m1+ m2; Using the center of mass synthesis principle, the center of gravity position of the overall system (x total ,y total ) can be calculated by the following formula: In the x direction: ; In the y direction: .

6. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 3 is characterized in that: The local cutouts of the crash barrier include end cutouts and hanger installation cutouts. The former is used to disconnect the crash barrier between the hoisting span and the crash barrier without hoisting span, and the latter is used for the installation of τ-shaped hangers. The requirements for local cutouts of crash barriers are as follows: The local incision of the crash wall should be completed before hoisting to ensure the continuity of operation and overall efficiency; The end cut should be located at the expansion joint or continuous joint to ensure that the cut is basically flush with the end surface of the plate beam, and the cut depth must be complete without any residual steel bars; The requirements for the installation cutout of the spreader are as follows: The connection between the crash wall and the plate beam should be cut obliquely, that is, the crash wall and the plate beam cantilever should be cut together; To ensure the convenience of installing the τ-type spreader, the width of the cut should be 1.5 times the width of the spreader; The installation cutout of the hanger should be within the range of 1 on the side of the plate beam, and should not be less than the horizontal projection overlap width of the plate beam and the cap beam; When partially cutting the crash barrier, take traction or twisting measures to prevent the cut piece from falling from a high place during the cutting process.

7. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 2, characterized in that: The outer web and the inner web are both formed by a single steel plate through correction and bending, and fit the shape of the main board.

8. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 2, characterized in that: It also includes a lifting point module, which is installed on the upper part of the τ-shaped spreader and serves to connect the τ-shaped spreader and the shackle to prevent the τ-shaped spreader from being too wide so that the shackle cannot be directly connected and installed with the spreader; The lifting point module is composed of two ear plates and a reinforcement ear plate in the middle, which are welded and assembled. When in use, the ear plate of the lifting point module is inserted into the gap between the main boards of the τ-shaped sling and fixed with a pin shaft.

9. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 2, characterized in that: It also includes an anti-tilt connector, which is a steel wire rope with shackles installed at both ends. It is installed between the perforated ear plates of the upper beam and the lower beam of the middle layer main board to make the sling structure closed, which plays an anti-tilt protection role during lifting and prevents the suspended object from slipping due to external interference.

10. The method for integrally lifting and dismantling a hollow slab girder bridge section with a crash wall according to claim 2, characterized in that: It also includes a connection module, which includes two ear plates and a stiffening plate connecting the ear plates. The connection module is vertically arranged between the τ-shaped hangers and is connected by a pin shaft to achieve structural reinforcement.

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