A method for hoisting, dragging and placing the cap beam under a low-clearance bridge

Abstract

The invention discloses a construction method for hoisting, dragging and placing a cap beam under a low-clearance bridge. 1. The construction method comprises: S1: bridge pier construction; S2: erecting a bracket; S3: hoisting a steel cap beam; S4: horizontally pulling and placing the steel cap beam; S5: removing the bracket and restoring traffic. The application has the effect of being able to install a steel cap beam under low-clearance conditions under an existing bridge.

Description

Technical Field

[0001] The invention relates to the field of engineering construction, and in particular to a construction method for hoisting, dragging and placing a cap beam under a low-clearance bridge. Background Art

[0002] An overpass, or "three-dimensional intersection bridge", is a modern land bridge built at an important traffic intersection in a city. It is multi-directional and non-interfering. The biggest function of an overpass is to eliminate the conflict of cross-road traffic by means of spatial isolation, so that straight vehicles on two cross-roads can move smoothly. In fact, it makes the flat road three-dimensional, so that it can accommodate more traffic.

[0003] When constructing an overpass, multiple pairs of piers are built in sequence along the predetermined direction, and steel cap beams are erected on each pair of piers as support for the bridge superstructure. Workers carry out subsequent construction on the steel cap beams.

[0004] Regarding the above-mentioned related technologies, when a new viaduct is built under an existing bridge and a crane is used to lift the steel cap beam onto the bridge pier, the crane hook is affected by the existing bridge above and cannot directly lift the steel cap beam into place. Summary of the invention

[0005] In order to install a steel cap beam under an existing bridge with low clearance, the present application provides a construction method for hoisting, dragging and placing a cap beam under a low clearance bridge.

[0006] The present application provides a method for hoisting, dragging and placing a low-clearance bridge cap beam, which adopts the following technical solution:

[0007] A method for hoisting, dragging and placing a cap beam under a low-clearance bridge, the method comprising:

[0008] S1: Bridge pier construction: The first bridge pier and the second bridge pier are constructed at the predetermined position under the bridge and the predetermined position outside the bridge respectively;

[0009] S2: Setting up brackets: Setting up a first bracket on a side of the first pier close to the second pier, setting up a second bracket around the second pier, and both the first bracket and the second bracket are provided with a sliding auxiliary component;

[0010] S3: Lifting of the steel cap beam: Lifting the steel cap beam onto the sliding auxiliary assembly on the first bracket and the second bracket;

[0011] S4: Horizontal pulling and placing of the steel cap beam: Use the sliding auxiliary assembly to drag the steel cap beam until the ends of the steel cap beam are respectively located above the first pier and the second pier, and then place the steel cap beam in place and fix it to the piers;

[0012] S5: Remove the support and resume traffic.

[0013] By adopting the above technical solution, a bracket is set at the bridge pier. After the steel cap beam is hoisted to the bracket, the steel cap beam can be loaded under low clearance conditions, and the positioning method is changed from direct hoisting to translation on the bracket, thus getting rid of the restriction of the existing bridge on the crane lifting of the steel cap beam. The steel cap beam can be slid to the top of the pier to complete the construction of the steel cap beam. At the same time, the bracket can provide stable support for the steel cap beam. Compared with the use of crane lifting, workers can slide the steel cap beam into place on the bracket according to the pre-designed angle without too much adjustment, and have better transportation stability.

[0014] Preferably, the sliding auxiliary assembly includes a first electric hoist, a support block and a polytetrafluoroethylene plate, the first electric hoist is hung on the first bracket, the first electric hoist is connected to a first steel wire rope, and one end of the first steel wire rope away from the first electric hoist is fixedly connected to the steel cap beam; the support block is fixedly installed on the cross frame of each bracket, and the polytetrafluoroethylene plate is arranged on the top of each support block; a connecting piece is arranged between the first pier and the first bracket;

[0015] The specific method of S3 includes: hoisting the steel cap beam onto the support blocks of the two brackets;

[0016] The specific method of S4 includes: installing the sliding auxiliary component in place, starting the first electric hoist to drag the steel cap beam until the end of the steel cap beam is aligned with the pier top of the pier, and then installing a jack on the top of each bracket, using the jack to lift the steel cap beam, removing the support block and placing the steel cap beam on each pier through the jack.

[0017] By adopting the above technical solution, first, when the steel cap beam is hoisted onto the polytetrafluoroethylene plate placed on the bracket, the friction between the steel cap beam and the bracket is reduced by the smooth plate surface, which facilitates the sliding of the steel cap beam. At the same time, the plate-shaped polytetrafluoroethylene plate is used to reduce the friction between the steel cap beam and the bracket. The plate is not easy to deform and can provide better bearing capacity, reduce the damage of the steel cap beam to other structures that can reduce sliding friction under the action of gravity, and improve the stability of bearing.

[0018] Second, in order to facilitate workers to adjust the position of the steel cap beam so that it can accurately land on the bridge pier after sliding, support blocks are set and the bottom height of the support blocks is higher than the height of the pier top. The steel cap beam can slide freely above the bridge pier through the support blocks until it reaches the predetermined landing position. At this time, the steel cap beam is raised and lowered by a jack;

[0019] Third, after the connecting piece is set, the first bracket is connected to the first pier, thereby improving the stability of the first bracket, so that the first electric hoist fixed on the first bracket can stably pull the steel cap beam, reducing the structural damage of the first bracket after being subjected to the reaction force.

[0020] Preferably, each of the brackets comprises a pair of upright frames fixed on the top, the two upright frames are respectively located on both sides of the bracket along the length direction of the steel cap beam, and a limiting roller is provided on the side where the two upright frames are close to each other;

[0021] The specific method of S2 includes: after completing the main body of the bracket, first erecting the stand on one side;

[0022] The specific method of S3 includes: after the steel cap beam is hoisted to the bracket and hoisted into place, the vertical frame and the limiting roller on the other side are erected.

[0023] By adopting the above technical solution, both sides of the steel cap beam along the length direction abut against the limiting rollers on the frame when sliding, thereby reducing the displacement during sliding and improving the sliding stability; at the same time, after erecting the frame on one side, the steel cap beam is directly lifted from the side to the bracket, which reduces the slippage of the steel cap beam on the bracket and speeds up the construction.

[0024] Preferably, the connecting member comprises a connecting frame and an outer covering plate; the outer covering plate is sleeved on the top of each pier, and a plurality of anti-pullout nails are arranged on the inner wall of the outer covering plate; one end of the connecting frame is connected to the outer covering plate of the first bracket, and the other end is connected to the first bracket;

[0025] The specific method of S1 also includes: when casting the bridge piers, presetting a boss on the top of each pier, installing the outer cover plate on the boss, and then pouring concrete into the outer cover plate to fix the outer cover plate on the bridge pier.

[0026] Because the piers are cast by concrete, the exterior facade lacks materials connected to the brackets. By adopting the above technical solution, an outer plate is installed on the piers and poured with concrete to fix the outer plate on the piers. Then, workers only need to weld the two ends of the connecting frame to the outer plate and the first bracket respectively to complete the reinforcement of the first bracket. At the same time, the outer plate can be welded to the steel cap beam to form a temporary fixation, reducing the movement of the steel cap beam after it is in place, which is convenient for workers to carry out subsequent reinforcement.

[0027] Preferably, the outer covering plate comprises a pair of mutually spliced ​​monomers, the bridge pier is provided with a mounting groove along the circumference of the boss, and the outer covering plate is provided with a fastener for locking the two connected monomers;

[0028] The specific method for installing the outer covering plate on the boss includes: hoisting the two monomers to the two sides of the boss in the horizontal direction, and then sliding the monomers in the horizontal direction and wedging them into the pier until each monomer is located directly above the installation groove, at which time the monomers are placed in place and the fasteners are used to lock the two monomers.

[0029] Because a steel frame is reserved on the pier at the predetermined installation position of the outer cover plate, and the distance between the top of the steel frame and the existing bridge is too small, it is difficult to directly put the entire outer cover plate on the top of the pier. By adopting the above technical solution, the outer cover plate is divided into two monomers, and the monomers are wedged into the top of the pier from the side. After locking with fasteners, the outer cover plate can be installed. This installation method gets rid of the restrictions of the existing bridge on the outer cover plate in the vertical direction by splitting the outer cover plate and installing it from the side, which makes it easier for workers to install the outer cover plate.

[0030] Preferably, a fixed frame is provided on the first pier, and a fixing opening is provided on the support frame for the steel cap beam to pass through; a second electric hoist is provided on the fixed frame, and the height of the second electric hoist is greater than the height of the first electric hoist; a second steel wire rope is provided on the second electric hoist, and one end of the second steel wire rope away from the second electric hoist is connected to the steel cap beam;

[0031] The specific method of S4 also includes: synchronously starting the first electric hoist and the second electric hoist until the steel cap beam slides into place.

[0032] By adopting the above technical solution, a second electric hoist is set at a position higher than the first electric hoist, so as to increase the pulling force on the steel cap beam in the horizontal direction, further realize the dragging of the steel cap beam, and speed up the construction.

[0033] Preferably, a telescopic rod and an elastic block are provided on one side of the fixed frame close to the second bracket, one end of the telescopic rod is detachably connected to the fixed frame, and the other end is fixedly connected to the elastic block, the steel cap beam is detachably mounted with a fixed block, a fixing groove is provided on the fixed block, and the notch of the fixing groove faces the first bracket and is directly opposite to the elastic block; when the steel cap beam is dragged into place, the elastic block is inserted into the fixed block through the fixing groove;

[0034] The specific method of S4 also includes: after starting the first electric hoist and the second electric hoist, until the elastic block is inserted into the fixed block.

[0035] After the steel cap beam is dragged by the first electric hoist and the second electric hoist, the steel cap beam slides on the smooth polytetrafluoroethylene plate. Since the steel cap beam has a large deadweight, it has a large inertia. After being dragged, it may slide excessively and be misaligned with the bridge pier. By adopting the above technical solution, when the steel cap beam slides into place, the fixed block abuts against the elastic block, and the kinetic energy of the steel cap beam is absorbed through the elastic deformation of the elastic block and the telescopic rod, thereby reducing the secondary movement of the steel cap beam after sliding into place.

[0036] Preferably, a pouring groove is provided on the fixing frame in the circumferential direction along the cross-sectional direction of the fixing opening, a connecting rod is provided in the pouring groove, and one end of the connecting rod away from the connection is used to be connected to the steel cap beam;

[0037] The specific method after S4 also includes: after the steel cap beam is dragged into place, the connecting rod is fixedly connected to the steel cap beam, and then a sealing assembly is used to seal the gap between the fixed frame and the steel cap beam and located on both sides of the pouring groove, and then concrete is poured into the pouring groove until the pouring groove is filled with concrete.

[0038] By adopting the above technical solution, when the steel cap beam is placed on the bridge pier, workers connect the connecting rod to the steel cap beam as a steel skeleton, and then use the sealing assembly to seal the gap between the fixed frame and the steel cap beam. After pouring concrete, the temporary fixed frame serves as a fixed structure between the steel cap beam and the bridge pier, thereby strengthening the connection stability between the steel cap beam and the bridge pier.

[0039] Preferably, the blocking assembly includes a first airbag and a driving rod, the fixing frame is provided with the first airbags at both ends of the fixing groove along the length direction of the steel cap beam; the fixing frame is provided with a driving groove in the fixing groove and directly below the steel cap beam in the vertical direction, the driving rod is slidably mounted on the fixing frame through the driving groove, a second airbag is provided at the bottom of the driving groove, the second airbag is connected to each of the first airbags through an air pipe, and one end of the driving rod away from the steel cap beam abuts against the second airbag;

[0040] The specific method of using the blocking assembly includes: after aligning the steel cap beam with the driving rod, driving the steel cap beam to fall onto the fixed frame.

[0041] By adopting the above technical solution, when the steel cap beam is dragged into place and the steel cap beam is placed in place with a jack, the bottom of the steel cap beam abuts against the driving rod to drive the driving rod to slide in the driving groove, and the driving rod squeezes the second airbag to transmit the gas in the second airbag to the first airbag through the air pipe. After the first airbag is inflated, it abuts against the side wall of the steel cap beam to form a seal. At this time, workers can pour concrete between the two first airbags to fix the steel cap beam to the bridge pier. The sealing structure uses the pressure when the steel cap beam is in place as a power source to drive gas transmission, and at the same time uses the inflated airbag as a sealing structure. First, the airbag can fit tightly with the steel cap beam to reduce the generation of gaps and produce a better sealing effect; second, the airbag expands quickly, which is conducive to quickly completing the sealing and speeding up the construction speed.

[0042] In summary, the present application includes at least one of the following beneficial technical effects:

[0043] 1. Changing the placement method from direct lifting to horizontal movement on the bracket eliminates the restrictions of the existing bridge on crane lifting of steel cap beams, and enables the steel cap beam to slide to the top of the pier to complete the construction of the steel cap beam;

[0044] 2. Divide the outer cover plate into two monomers, wedge the monomers into the pier top from the side, and lock them with fasteners to achieve the installation of the outer cover plate. This installation method breaks away from the vertical restrictions of the existing bridge on the outer cover plate by splitting the outer cover plate and installing it from the side, making it easier for workers to install the outer cover plate;

[0045] 3. Connect the connecting rods to the steel cap beam as a steel skeleton, and then use the sealing assembly to seal the gap between the fixed frame and the steel cap beam. After pouring concrete, the temporary fixed frame serves as a fixed structure between the steel cap beam and the bridge pier to enhance the connection stability between the steel cap beam and the bridge pier. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the installation status of the bridge pier in the embodiment of the present application.

[0047] Figure 2 It is a schematic diagram of the structure of the bridge pier and the outer cladding plate in the embodiment of the present application.

[0048] Figure 3 It is a top view of the outer covering plate in the embodiment of the present application.

[0049] Figure 4 It is a schematic diagram of the state of bracket installation in an embodiment of the present application.

[0050] Figure 5 In the embodiment of this application Figure 4 A is an enlarged view of the middle image.

[0051] Figure 6 It is a schematic diagram of the state in which the steel cap beam is placed in place in the embodiment of the present application.

[0052] Figure 7 It is a schematic diagram of the state of the steel cap beam being placed on the fixed frame in the embodiment of the present application.

[0053] Figure 8 It is a structural schematic diagram of a fixed frame in an embodiment of the present application.

[0054] Fig. 9 It is a cross-sectional view of the fixed frame in the embodiment of the present application.

[0055] Description of reference numerals:

[0056] 1. Bridge pier; 11. First bridge pier; 12. Second bridge pier; 13. Boss; 14. Connecting frame; 2. Outer plate; 21. Anti-pullout nail; 22. Single body; 23. Fastener; 3. Bracket; 31. First bracket; 32. Second bracket; 33. Vertical frame; 331. Limit roller; 4. Sliding auxiliary component; 41. First electric hoist; 42. Support block; 43. First steel wire rope; 5. Steel cap beam; 6. Fixed frame; 61. Fixed port; 62. Second electric hoist; 63. Second steel wire rope; 64. Telescopic rod; 65. Elastic block; 66. Casting trough; 67. Connecting rod; 7. Blocking component; 71. First airbag; 72. Driving rod; 73. Second airbag. DETAILED DESCRIPTION

[0057] The following is combined with Figure 1-9 This application is described in further detail.

[0058] The present application embodiment discloses a method for hoisting and dragging a cap beam under a low-clearance bridge. Figure 1 and Figure 2 , construction methods include:

[0059] S1: Construction of pier 1: The formwork of the first pier 11 and the second pier 12 are respectively constructed at the predetermined position under the existing bridge and the predetermined position outside the bridge, and concrete is poured into each formwork. After the concrete solidifies, the construction of the first pier 11 and the second pier 12 is completed.

[0060] S1.1: When casting the bridge piers 1 , a boss 13 is preset on the top of each bridge pier 1 to facilitate workers to install the outer cover plate 2 on the boss 13 .

[0061] S1.2: Install the outer cover plate 2 on the boss 13, and then pour concrete into the outer cover plate 2 to fix the outer cover plate 2 on the pier 1; a plurality of anti-pullout nails 21 are arranged on the inner wall of the outer cover plate 2; after pouring the concrete, the anti-pullout nails 21 are used to increase the contact area between the concrete and the outer cover plate 2, thereby improving the connection strength between the pier 1 and the outer cover plate 2, and laying a good foundation for the connection between the pier 1 and the bracket 3.

[0062] Reference Figure 2 and Figure 3The outer covering plate 2 includes a pair of monomers 22 spliced ​​with each other. In the present embodiment, the cross-sectional shape of the monomer 22 is L-shaped. The pier 1 is provided with a mounting groove along the circumference of the boss 13. The outer covering plate 2 is provided with a fastener 23 for locking the two connected monomers 22. In the present embodiment, the fastener 23 is a bidirectional threaded rod, and different threaded sections of the bidirectional threaded rod are respectively threadedly connected to the two monomers 22. When the bottom edge of the outer covering plate 2 is inserted into the mounting groove, the bottom edge of one side of the monomer 22 of the outer covering plate 2 abuts against the boss 13. When the two monomers 22 need to be locked, the two monomers 22 can be driven to deviate in the direction of approaching each other by simply twisting the bidirectional threaded rod, and the purpose of locking the monomer 22 is achieved under the action of the abutment of the boss 13.

[0063] In S1.2, the specific method of installing the outer cover plate 2 on the boss 13 includes: hoisting two monomers 22 to the two sides of the boss 13 in the horizontal direction, and then sliding the monomers 22 in the horizontal direction and wedging them into the pier 1 until each monomer 22 is located directly above the installation groove. At this time, the monomer 22 is placed in the installation groove and the two monomers 22 are locked using the fasteners 23.

[0064] S2: Erection of bracket 3: Reference Figure 4 A first bracket 31 is set up on the side of the first pier 11 close to the second pier 12, wherein the predetermined construction position of the first bracket 31 is the maximum position that the end of the steel beam facing under the bridge can reach when the crane is hoisted; a second bracket 32 ​​is set around the second pier 12, and a sliding auxiliary component 4 is set on the first bracket 31 and the second bracket 32; a connecting piece is set between the first pier 11 and the first bracket 31.

[0065] The connecting member includes a connecting frame 14 and an outer plate 2; one end of the connecting frame 14 is connected to the outer plate 2 of the first bracket 31, and the other end is connected to the first bracket 31; Figure 5 Each bracket 3 includes a pair of upright frames 33 fixed on the top, and the two upright frames 33 are respectively located on both sides of the bracket 3 along the length direction of the steel cap beam 5, and a limiting roller 331 is provided on the side where the two upright frames 33 are close to each other.

[0066] S2.1: Reference Figure 4 After the main body of the support 3 is constructed, the stand 33 on one side is erected first. When workers hoist the steel cap beam 5, they can directly hoist the steel cap beam 5 onto the support 3 on the side where the stand 33 is not installed, thus reducing the process of driving the steel cap beam 5 to slide;

[0067] S3: Steel cap beam 5 hoisting: refer to 5 and Figure 6 , hoist the steel cap beam 5 onto the sliding auxiliary assembly 4 on the first bracket 31 and the second bracket 32.

[0068] Reference Figure 5 and Figure 6The sliding auxiliary assembly 4 includes a first electric hoist 41, a support block 42 and a polytetrafluoroethylene plate. The first electric hoist 41 is hung on the first bracket 31. The first electric hoist 41 is connected to a first steel wire rope 43. The end of the first steel wire rope 43 away from the first electric hoist 41 is used to be fixedly connected to the steel cap beam 5. The cross frame of each bracket 3 is fixedly installed with a support block 42. The top height of the support block 42 is higher than the top height of the pier 1. A polytetrafluoroethylene plate is provided on the top of each support block 42.

[0069] S3.1: Lift the steel cap beam 5 onto the supporting blocks 42 of the two brackets 3.

[0070] S3.2: After the steel cap beam 5 is hoisted onto the support block 42 of the bracket 3 and hoisted into place, the vertical frame 33 and the limiting roller 331 on the other side are erected. The limiting rollers 331 on both sides can reduce the deviation of the sliding path of the steel cap beam 5 during sliding.

[0071] S4: Horizontally pull the steel cap beam 5 into position: Use the sliding auxiliary component 4 to drag the steel cap beam 5 until the ends of the steel cap beam 5 are respectively located above the first pier 11 and the second pier 12, and then put the steel cap beam 5 into position and fix it to the pier 1.

[0072] The specific methods of S4 include: Figure 6 , install the sliding auxiliary component 4 in place, and drag the steel cap beam 5 until the end of the steel cap beam 5 is aligned with the pier top of the pier 1, and then install a jack on the top of each bracket 3, use the jack to lift the steel cap beam 5 until the bottom of the steel cap beam 5 no longer abuts against the polytetrafluoroethylene plate on the support block 42, then remove the support block 42 and use the jack to lower the steel cap beam 5 to each pier 1. At this time, the workers perform the fixing construction of the steel cap beam 5.

[0073] Reference Figure 7 A fixed frame 6 is provided at the top of the first pier 11, and the support frame is provided with a fixing opening 61 for the steel cap beam 5 to pass through; the fixed frame 6 is provided with a second electric hoist 62, and the height of the second electric hoist 62 is greater than the height of the first electric hoist 41; the second electric hoist 62 is provided with a second steel wire rope 63, and the end of the second steel wire rope 63 away from the second electric hoist 62 is connected to the steel cap beam 5.

[0074] S4.1: Start the first electric hoist 41 and the second electric hoist 62 synchronously until the steel cap beam 5 slides into place.

[0075] Reference Figure 8A telescopic rod 64 and an elastic block 65 are provided on one side of the fixed frame 6 close to the second bracket 32. One end of the telescopic rod 64 is detachably connected to the fixed frame 6, and the other end is fixedly connected to the elastic block 65. The steel cap beam 5 is detachably installed with a fixed block, and a fixing groove is opened on the fixed block. The notch of the fixing groove faces the first bracket 31 and is opposite to the elastic block 65; when the steel cap beam 5 is dragged into place, the elastic block 65 is inserted into the fixed block through the fixing groove; because the pulling force on the steel cap beam 5 in the horizontal direction increases, and the steel cap beam 5 itself has a large inertia, in order to brake the steel cap beam 5 after sliding, the elastic block 65 is abutted against the fixing groove after sliding into place, thereby braking the steel cap beam 5 as a whole, and at the same time, the deformation of the elastic block 65 is used to reduce the damage caused by the impact on the elastic block 65 after the abutment.

[0076] The method after S4.1 includes: starting the first electric hoist 41 and the second electric hoist 62 until the elastic block 65 is inserted into the fixed block.

[0077] Reference Figure 8 and Fig. 9 A pouring groove 66 is circumferentially opened on the fixed frame 6 along the cross-sectional direction of the fixing opening 61 , and a connecting rod 67 is arranged in the pouring groove 66 . The end of the connecting rod 67 away from the connection is used to connect to the steel cap beam 5 .

[0078] S4.2: After the steel cap beam 5 is dragged into place, the connecting rod 67 is fixedly connected to the steel cap beam 5, and then the sealing assembly 7 is used to seal the gap between the fixed frame 6 and the steel cap beam 5 and on both sides of the pouring groove 66, and then concrete is poured into the pouring groove 66 until the pouring groove 66 is filled with concrete.

[0079] Reference Fig. 9 The blocking assembly 7 includes a first airbag 71 and a driving rod 72. The fixed frame 6 is provided with first airbags 71 at both ends of the fixed groove along the length direction of the steel cap beam 5. The fixed frame 6 is provided with a driving groove in the fixed groove and directly below the steel cap beam 5 in the vertical direction. The driving rod 72 is slidably installed on the fixed frame 6 through the driving groove. A second airbag 73 is provided at the bottom of the driving groove. The second airbag 73 is connected to each first airbag 71 through an air pipe. One end of the driving rod 72 away from the steel cap beam 5 abuts against the second airbag 73.

[0080] The specific method of using the blocking assembly 7 includes: after aligning the steel cap beam 5 with the driving rod 72, driving the steel cap beam 5 to fall on the fixed frame 6, and transmitting the gas to the first airbag 71 by squeezing the second airbag 73 through the driving rod 72, thereby driving the first airbag 71 to expand and abut against the steel cap beam 5, thereby blocking the gap between the steel cap beam 5 and the fixed frame 6, making it easier for workers to pour concrete and use the fixed frame 6 as a template for concrete. After the concrete solidifies, the pier 1 is connected to the steel cap beam 5, reducing the number of steps for workers to fix the steel cap beam 5.

[0081] S5: Remove support 3 and resume traffic.

[0082] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for hoisting, dragging and placing a low-clearance bridge cap beam, characterized in that: The construction method comprises: S1: Construction of bridge piers (1): construction of a first bridge pier (11) and a second bridge pier (12) at a predetermined position under the bridge and a predetermined position outside the bridge respectively; S2: erecting a support (3): erecting a first support (31) on a side of the first pier (11) close to the second pier (12), and arranging a second support (32) around the second pier (12); and both the first support (31) and the second support (32) are provided with a sliding auxiliary component (4); S3: hoisting the steel cap beam (5): hoisting the steel cap beam (5) onto the sliding auxiliary assembly (4) on the first bracket (31) and the second bracket (32); S4: Horizontally pull the steel cap beam (5) into position: Use the sliding auxiliary component (4) to drag the steel cap beam (5) until the ends of the steel cap beam (5) are respectively located above the first bridge pier (11) and the second bridge pier (12), and then place the steel cap beam (5) into position and fix it to the bridge pier (1); S5: Remove the support (3) and resume traffic; The sliding auxiliary component (4) comprises a first electric hoist (41), a support block (42) and a polytetrafluoroethylene plate, wherein the first electric hoist (41) is hung on the first bracket (31), a first steel wire rope (43) is connected to the first electric hoist (41), and an end of the first steel wire rope (43) away from the first electric hoist (41) is fixedly connected to the steel cap beam (5); the support block (42) is fixedly installed on the cross frame of each bracket (3), and a connecting piece is provided between the first pier (11) and the first bracket (31); The specific method of S3 comprises: hoisting the steel cap beam (5) onto the support blocks (42) of the two brackets (3); The specific method of S4 comprises: installing the sliding auxiliary component (4) in place, starting the first electric hoist (41) to drag the steel cap beam (5) until the end of the steel cap beam (5) is aligned with the top of the pier (1), and then installing a jack on the top of each bracket (3), using the jack to lift the steel cap beam (5), removing the support block (42) and using the jack to place the steel cap beam (5) on each pier (1); The first pier (11) is provided with a fixed frame (6), the fixed frame (6) is provided with a fixed opening (61) for the steel cap beam (5) to pass through; the fixed frame (6) is provided with a second electric hoist (62), the height of the second electric hoist (62) is greater than the height of the first electric hoist (41); the second electric hoist (62) is provided with a second steel wire rope (63), and the end of the second steel wire rope (63) away from the second electric hoist (62) is connected to the steel cap beam (5); The specific method of S4 also includes: synchronously starting the first electric hoist (41) and the second electric hoist (62) until the steel cap beam (5) slides into place; A telescopic rod (64) and an elastic block (65) are provided on one side of the fixed frame (6) close to the second bracket (32); one end of the telescopic rod (64) is detachably connected to the fixed frame (6), and the other end is fixedly connected to the elastic block (65); the steel cap beam (5) is detachably installed with a fixed block, and a fixing groove is provided on the fixed block, and the notch of the fixing groove faces the first bracket (31) and is opposite to the elastic block (65); when the steel cap beam (5) is dragged into place, the elastic block (65) is inserted into the fixed block through the fixing groove.

2. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 1 is characterized in that: The top of each support block (42) is provided with the polytetrafluoroethylene plate.

3. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 2 is characterized in that: Each of the brackets (3) comprises a pair of upright frames (33) fixedly mounted on the top, the two upright frames (33) are respectively located on both sides of the bracket (3) along the length direction of the steel cap beam (5), and a limiting roller (331) is arranged on the side where the two upright frames (33) are close to each other; The specific method of S2 comprises: after completing the construction of the main body of the support (3), first erecting the stand (33) on one side; The specific method of S3 includes: hoisting the steel cap beam (5) to the bracket (3) and after hoisting it into place, erecting the stand (33) and the limiting roller (331) on the other side.

4. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 2 is characterized in that: The connecting member comprises a connecting frame (14) and an outer covering plate (2); the outer covering plate (2) is sleeved on the top of each pier (1), and a plurality of anti-pullout nails (21) are arranged on the inner wall of the outer covering plate (2); one end of the connecting frame (14) is connected to the outer covering plate (2) of the first bracket (31), and the other end is connected to the first bracket (31); The specific method of S1 also includes: when pouring the bridge pier (1), pre-setting a boss (13) on the top of each pier (1), installing the outer cover plate (2) on the boss (13), and then pouring concrete into the outer cover plate (2) to fix the outer cover plate (2) on the bridge pier (1).

5. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 4 is characterized in that: The outer covering plate (2) comprises a pair of mutually spliced ​​monomers (22), the bridge pier (1) is provided with a mounting groove along the circumference of the boss (13), and the outer covering plate (2) is provided with a fastener (23) for locking the two connected monomers (22); The specific method for installing the outer cover plate (2) on the boss (13) comprises: hoisting the two monomers (22) to the two sides of the boss (13) in the horizontal direction, and then sliding the monomers (22) in the horizontal direction and wedging them into the pier (1) until each monomer (22) is located directly above the installation groove, at which time the monomers (22) are placed in place and the fasteners (23) are used to lock the two monomers (22).

6. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 1 is characterized in that: The specific method of S4 further includes: after starting the first electric hoist (41) and the second electric hoist (62), until the elastic block (65) is inserted into the fixed block.

7. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 6 is characterized in that: The fixing frame (6) is provided with a pouring groove (66) in the circumferential direction along the cross-sectional direction of the fixing opening (61), a connecting rod (67) is arranged in the pouring groove (66), and an end of the connecting rod (67) away from the connection is used to be connected to the steel cap beam (5); The specific method after S4 also includes: after the steel cap beam (5) is dragged into place, the connecting rod (67) is fixedly connected to the steel cap beam (5), and then the sealing assembly (7) is used to seal the gap between the fixed frame (6) and the steel cap beam (5) and on both sides of the pouring groove (66), and then concrete is poured into the pouring groove (66) until the pouring groove (66) is filled with concrete.

8. The method for hoisting, dragging and placing a low-clearance bridge cap beam according to claim 7 is characterized in that: The blocking assembly (7) comprises a first airbag (71) and a driving rod (72), and the fixing frame (6) is provided with the first airbag (71) at both ends of the fixing opening (61) along the length direction of the steel cap beam (5); the fixing frame (6) is provided with a driving groove in the fixing opening (61) and directly below the steel cap beam (5) in the vertical direction, and the driving rod (72) is slidably mounted on the fixing frame (6) through the driving groove, and a second airbag (73) is provided at the bottom of the driving groove, and the second airbag (73) is connected to each of the first airbags (71) through an air pipe, and one end of the driving rod (72) away from the steel cap beam (5) abuts against the second airbag (73); The specific method of using the blocking assembly (7) comprises: after aligning the steel cap beam (5) with the driving rod (72), driving the steel cap beam (5) to fall onto the fixed frame (6).

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