A steel truss girder dragging and sliding device across expressways and a construction method

Abstract

This application relates to the technical field of the erection construction of steel truss girders, and proposes a steel truss girder dragging and sliding device for crossing an expressway; it includes a starting-end abutment and a receiving-end abutment, and the starting-end abutment and the receiving-end abutment are respectively arranged on both sides of the existing road; a starting-end temporary support and a receiving-end temporary support, the starting-end temporary support and the receiving-end temporary support are respectively arranged on both sides of the existing road and the starting-end temporary support and the receiving-end temporary support are located between the starting-end abutment and the receiving-end abutment; a traction assembly, the traction assembly is arranged on the receiving-end abutment, and two groups of parallel slide rails are laid on the starting-end abutment, the receiving-end abutment, the starting-end temporary support, the receiving-end temporary support and the roadbed near the starting-end abutment; the steel truss girder is located on the roadbed near the starting-end abutment, and a number of main sliding seats are arranged on both opposite sides of the bottom of the steel truss girder; this application has the effect of reducing the impact on the normal use of the existing road during the erection construction of the steel truss girder.

Description

Technical Field

[0001] This application relates to the technical field of steel truss beam towing construction, and in particular, to a steel truss beam towing and sliding device and construction method for crossing an expressway. Background Art

[0002] During road construction, it is usually necessary to cross an existing highway. During construction, the subgrade sections of the road to be constructed are usually constructed on both sides of the existing highway first, and then a bridge section is constructed between two adjacent subgrade sections of the road to be constructed to connect the adjacent subgrade sections of the road to be constructed. The bridge section includes abutments arranged on both sides of the existing highway and a steel truss bridge (hereinafter referred to as "steel truss beam") erected between the adjacent abutments.

[0003] During the actual construction of the steel truss beam, it is necessary to temporarily block the existing highway, set up temporary supports on the existing highway, and finally weld and assemble the steel truss beam on the temporary supports. The construction process requires occupying the existing highway as a construction site for a long time, seriously affecting the normal use of the existing highway. Summary of the Invention

[0004] In order to reduce the impact of steel truss beam construction on the normal use of the existing road, this application provides a steel truss beam towing and sliding device and construction method for crossing an expressway.

[0005] A steel truss beam towing and sliding device and construction method provided by this application adopt the following technical solutions:

[0006] A steel truss beam towing and sliding device for crossing an expressway includes:

[0007] A starting-end abutment and a receiving-end abutment, which are respectively arranged on both sides of the existing road;

[0008] A starting-end temporary support and a receiving-end temporary support, which are respectively arranged on both sides of the existing road and the starting-end temporary support and the receiving-end temporary support are located between the starting-end abutment and the receiving-end abutment;

[0009] A traction assembly, which is arranged on the receiving-end abutment and is used to drive the steel truss beam to move towards the receiving-end abutment;

[0010] Two groups of parallel slide rails are laid on the starting-end abutment, the receiving-end abutment, the starting-end temporary support, the receiving-end temporary support and the subgrade near the starting-end abutment;

[0011] The steel truss beam is located on the subgrade near the starting-end abutment, and a plurality of main sliding seats are arranged on both opposite sides of the bottom of the steel truss beam; the main sliding seats are used for sliding connection and cooperation with the slide rails.

[0012] By adopting the above technical solution, during actual construction, the steel truss girder is assembled on the subgrade, and the main sliding seats at the bottom of the steel truss girder are slidably connected and matched with the slide rails on the subgrade. After connecting the traction assembly to the steel truss girder, the steel truss girder is driven by the traction assembly to move towards the receiving end abutment until both ends of the steel truss girder are respectively located on the receiving end abutment and the starting end abutment, and the erection of the steel truss girder can be realized. Compared with the traditional method of erecting temporary supports on the existing road and assembling the steel truss girder, the influence on the normal traffic of the existing road is reduced. Through the setting of the main sliding seat and the slide rail, it is convenient for the steel truss girder to slide more stably towards the receiving end bridge.

[0013] Preferably, the traction assembly includes a reaction seat fixed on the receiving end abutment. Two groups of jacks passing through the core are arranged in parallel on the reaction seat. Two groups of connecting plates are arranged on the bottom of the steel truss girder corresponding to the two groups of jacks passing through the core. The steel strand is threaded through the jack passing through the core, and the end of the steel strand far from the jack passing through the core is anchored on the corresponding connecting plate.

[0014] By adopting the above technical solution, after anchoring the end of the steel strand far from the jack passing through the core on the connecting plate, the steel truss girder can be driven to slide towards the receiving end abutment by tensioning the steel strand through the jack passing through the core, making the movement of the steel truss girder simpler and more convenient.

[0015] Preferably, a construction method of a steel truss girder towing and sliding device across an expressway includes the following steps:

[0016] S1: Construct the starting end abutment, receiving end abutment, starting end temporary support and receiving end temporary support on both sides of the existing road;

[0017] S2: Slide rail installation: Lay slide rails on the subgrade near the starting end abutment, the starting end abutment, the starting end temporary support, the receiving end temporary support and the receiving end abutment;

[0018] S3: Assemble the steel truss girder on the subgrade near the starting end abutment and make the main sliding seats at the bottom of the steel truss girder slidably connected to the slide rails on the subgrade;

[0019] S4: Traction assembly installation: Install the traction assembly on the receiving end abutment and connect the traction assembly to the steel truss girder;

[0020] S5: Steel truss girder towing construction: Drive the steel truss girder to slide towards the receiving end abutment through the traction assembly until both ends of the steel truss girder are respectively located on the starting end abutment and the receiving end abutment;

[0021] S6: Steel truss girder beam lowering construction.

[0022] By adopting the above technical solution, after assembling the steel truss girder on the subgrade and making the main sliding seat at the bottom of the steel truss girder slidably connected to the slide rail on the subgrade, the traction assembly is connected to the steel truss girder. The steel truss girder is driven by the traction assembly to slide towards the receiving-end abutment, so that one end of the steel truss girder facing the receiving-end abutment spans the existing highway and moves to the receiving-end abutment, and the erection construction of the steel truss girder can be realized, reducing the impact on the existing road during the construction of the steel truss girder.

[0023] Preferably, in step S5, when the traction assembly drives the steel truss girder to slide out of the starting-end temporary support, a temporary jacking assembly is installed at one end of the slide rail of the receiving-end temporary support facing the starting-end temporary support; the temporary jacking assembly includes a support base, and a main jack is vertically arranged upward at the top end of the support base.

[0024] By adopting the above technical solution, when the traction assembly drives the steel truss girder to slide onto the receiving-end temporary support, at this time, the cantilever of the steel truss girder is the longest, and the steel truss girder is prone to deflection, resulting in difficulty for the main sliding seat at the bottom of the steel truss girder to be clamped into the slide rail; through the setting of the temporary jacking assembly, when the steel truss girder deflects, the main jack of the temporary jacking assembly is used to jack up the end of the steel truss girder until the bottom end face of the main sliding seat is slightly higher than the slide rail of the receiving-end temporary support, and then the steel truss girder is continuously driven by the traction assembly to slide further towards the receiving-end abutment, facilitating the main sliding seat at the bottom of the steel truss girder to slide more smoothly onto the slide rail of the receiving-end temporary support.

[0025] Preferably, a plurality of support rods are horizontally fixed at the bottom end of the support base, and the axial direction of the support rods is perpendicular to the length direction of the slide rail.

[0026] By adopting the above technical solution, through the setting of the support rods, it is convenient to reduce the contact area between the support base and the slide rail through the support rods, thereby reducing the friction between the support base and the slide rail, and facilitating the traction device to drive the steel truss girder to drive the support base to slide on the slide rail together.

[0027] Preferably, in step S2, after the steel truss girder is assembled, a guiding and limiting mechanism is installed on the bottom plate of the steel truss girder. The guiding and limiting mechanism includes a support plate arranged on the bottom plate of the steel truss girder. Two groups of guiding rods are slidably connected to one end of the support plate facing the receiving-end abutment, and the length direction of the guiding rods is parallel to the length direction of the steel truss girder; the support plate is also provided with a driving assembly for driving the two groups of guiding rods to extend out of the steel truss girder. A secondary jack is vertically arranged downward at one end of each guiding rod facing the receiving-end abutment, and a secondary sliding seat is arranged at the bottom end of the piston rod of each secondary jack, and the secondary sliding seat is used for sliding connection and cooperation with the slide rail.

[0028] By adopting the above technical solution, when the traction assembly drives the steel truss girder to slide out of the starting-end temporary support, the driving assembly is used to drive two groups of guide rods to extend out of the steel truss girder. When the traction assembly drives the steel truss girder to move until the auxiliary sliding seats at the ends of the two groups of guide rods are located above the slide rails of the receiving-end temporary support, the auxiliary jacks are used to drive the auxiliary sliding seats to move down until the auxiliary sliding seats are clamped into the slide rails, so as to realize that the situation of too long cantilever length when the steel truss girder crosses the existing highway is restricted by the two groups of guide rods, and it is not easy for the steel truss girder to deflect downward when crossing the existing road, resulting in the situation that the main sliding seat at the bottom of the steel truss girder is difficult to be clamped into the slide rail on the receiving-end temporary support; then, while the traction assembly drives the steel truss girder to continue sliding towards the receiving-end temporary support, the driving assembly is used to drive the guide rods to slide towards the direction close to the steel truss girder until the main sliding seat at the bottom of the steel truss girder is clamped into the slide rail of the receiving-end temporary support; this is beneficial to reducing the interference between the subsequent guide rods extending out of the steel truss girder and the traction assembly on the receiving-end bridge pier.

[0029] Preferably, in step S5, when the traction assembly drives the steel truss girder to extend out of the starting-end temporary support, sandbags are placed at one end of the steel truss girder far from the receiving-end bridge pier to increase the counterweight at the end of the steel truss girder far from the receiving-end bridge pier.

[0030] By adopting the above technical solution, by placing sandbags at one end of the steel truss far from the receiving-end temporary support, when the traction assembly drives the steel truss girder to extend out of the starting-end temporary support towards the end of the receiving-end bridge pier, the steel truss girder is less likely to deflect and shift downward.

[0031] Preferably, in step S2, after the slide rails are installed, butter is smeared on the surface of the slide rails.

[0032] By adopting the above technical solution, by smearing butter on the slide rails, it is beneficial to reduce the friction between the main sliding seat and the slide rails, and it is convenient for the steel truss girder to slide more smoothly on the slide rails through the main sliding seat under the drive of the traction assembly subsequently.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. Two groups of parallel slide rails are provided on the starting-end bridge pier, the receiving-end bridge pier, the starting-end temporary support, the receiving-end temporary support and the roadbed near the receiving-end bridge pier, and a number of sliding seats are provided on the opposite sides of the bottom of the steel truss girder; the receiving-end bridge pier is also provided with a traction assembly; after the steel truss girder is assembled on the roadbed and the sliding seats on both sides of the bottom end of the steel truss girder are respectively embedded into the two groups of slide rails, the traction assembly is used to drive the steel truss girder to slide towards the receiving-end bridge pier until both ends of the steel truss girder are respectively located on the receiving-end bridge pier and the starting-end bridge pier, so that the erection construction of the steel truss girder can be realized, and there is no need to set up temporary supports on the existing road and then carry out the erection and assembly of the steel truss girder, reducing the impact of the steel truss girder erection construction on the traffic of the existing road.

[0035] 2. By placing a temporary jacking member on the slide rail of the temporary support at the receiving end, the temporary jacking member includes a support base and a main jack vertically arranged on the support base. When the traction assembly drives the end of the steel truss beam to slide above the slide rail of the temporary support at the receiving end, the main jack of the temporary jacking member jacks up the end of the steel truss beam, making the bottom end face of the main sliding seat of the steel truss beam slightly higher than the slide rail, thus facilitating the subsequent smooth sliding of the main sliding seat at the bottom of the steel truss beam into the slide rail.

[0036] 3. Through the setting of the guiding and limiting assembly, when the traction assembly drives the steel truss beam to slide out of the temporary support at the starting end, the driving assembly is used to drive two groups of guiding rods to extend. When the traction assembly drives the steel truss beam to slide until the secondary sliding seat at the end of the guiding rod is above the slide rail of the temporary support at the receiving end, the secondary jack is used to drive the secondary sliding seat to embed into the corresponding slide rail, facilitating the use of the guiding rods to limit the situation where the cantilever of the steel truss is too long, so that the steel truss beam is not prone to deflection deformation when crossing the existing road.

[0037] 4. After the secondary sliding seat is slidably connected to the slide rail of the temporary support at the receiving end, while the traction assembly drives the steel truss beam to continue sliding towards the temporary support at the receiving end, the driving assembly is used to drive two groups of guiding rods to retract into the steel truss beam, which is beneficial to reducing the interference between the two groups of guiding rods extending out of the steel truss beam and the traction assembly. Description of the Drawings

[0038] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1.

[0039] Figure 2 It is Figure 1 An enlarged schematic diagram of part A in

[0040] Figure 3 It is Figure 1 An enlarged schematic diagram of part B in

[0041] Figures 4 to 6 It is a schematic diagram of the state when the steel truss beam slides in Embodiment 1

[0042] Figure 7 It is a schematic diagram of the structure of Embodiment 2.

[0043] Figure 8 It is Figure 7 An enlarged schematic diagram of part C in

[0044] Description of the Reference Numerals:

[0045] 1. Roadbed; 10. Active road; 11. Starting end abutment; 12. Receiving end abutment; 13. Starting end temporary support; 14. Receiving end temporary support; 2. Steel truss; 3. Reaction seat; 31. Through-hole jack; 32. Steel strand; 4. Slide rail; 41. Main slide; 411. MGE plate; 412. Limit plate; 5. Support seat; 51. Main jack; 52. Support rod; 6. Support plate; 61. Guide rod; 611. Drive plate; 62. Drive assembly; 621. Reaction frame; 622. Drive jack; 63. Fixing plate; 64. Mounting plate; 65. Auxiliary jack; 66. Auxiliary slide. DETAILED DESCRIPTION

[0046] The following is combined with Figures 1 - 8 This application is described in further detail.

[0047] The embodiment of the present application discloses a dragging and sliding device for a steel truss beam across a highway and a construction method.

[0048] Embodiment 1

[0049] Reference Figure 1 and Figure 2 , a dragging and sliding device for a steel truss beam across a highway, comprising a starting end abutment 11, a receiving end abutment 12, a starting end temporary support 13, a receiving end temporary support 14 and a traction assembly;

[0050] The starting end abutment 11 and the receiving end abutment 12 are respectively located on both sides of the active road 10, and the traction assembly is arranged on the receiving end abutment 12. The starting end temporary support 13 and the receiving end temporary support 14 are respectively located on both sides of the active road 10, and the starting end temporary support 13 and the receiving end temporary support 14 are located between the starting end abutment 11 and the receiving end abutment 12.

[0051] Two sets of parallel slide rails 4 are fixed on the starting end abutment 11, the receiving end abutment 12, the starting end temporary support 13, the receiving end temporary support 14 and the roadbed 1 near the starting end abutment 11; the steel truss 2 is located on the roadbed 1 near the receiving end abutment 12; a number of main slide seats 41 are fixed on opposite sides of the lower surface of the bottom plate of the steel truss 2, and the main slide seats 41 are evenly distributed along the length direction of the steel truss 2, and the main slide seats 41 are used for sliding connection with the slide rails 4.

[0052] Limiting plates 412 are vertically arranged downward on both sides of the bottom end of the main slide 41. Two sets of limiting plates 412 form limiting grooves for the slide rail 4 to be embedded in, so that the main slide 41 is not easy to separate from the slide rail 4; an MGE plate 411 is also fixed to the end face of the bottom end of the main slide 41 to reduce the friction between the main slide 41 and the slide rail 4.

[0053] Reference Figure 1 and Figure 3, the traction assembly includes a reaction seat 3 fixed on the receiving-end abutment 12. On the side of the reaction seat 3 facing away from the starting-end abutment 11, two groups of jacks 31 are horizontally installed. Two groups of steel strands 32 are tension-connected to both groups of jacks 31. At the bottom of the steel truss girder 2, two groups of connecting plates are fixed corresponding to the two groups of jacks 31; one end of the steel strand 32 away from the jack 31 is anchored to the corresponding connecting plate. Through the above settings, by using the two groups of jacks 31 to tension the steel strands 32, the steel truss girder 2 can be driven to slide towards the receiving-end abutment 12 until both ends of the steel truss girder 2 are respectively located on the receiving-end abutment 12 and the starting-end abutment 11, so as to realize the erection construction of the steel truss girder 2.

[0054] A construction method for a steel truss girder 2 towing and sliding device across an expressway, referring to Figures 4 to 6 , includes the following steps:

[0055] S1: Construct the starting-end abutment 11, receiving-end abutment 12, starting-end temporary support 13 and receiving-end temporary support 14 on both sides of the existing road 10.

[0056] S2: Installation of the slide rail 4: Lay the slide rail 4 on the roadbed 1 near the starting-end abutment 11, starting-end abutment 11, starting-end temporary support 13, receiving-end temporary support 14 and receiving-end abutment 12; after the slide rail 4 is laid, apply butter on the surface of the slide rail 4 in time to reduce the friction between the subsequent main slide block 41 and the slide rail 4, so as to facilitate the main slide block 41 to slide more smoothly on the slide rail 4.

[0057] S3: Assemble the steel truss girder 2 on the roadbed 1 near the starting-end abutment 11 and make the main slide block 41 at the bottom of the steel truss girder slide-connected to the slide rail 4 on the roadbed 1; the specific operation is as follows:

[0058] S3.1: Level the site and pour the strip foundation for storing each steel component of the steel truss girder 2.

[0059] S3.2: Install the gantry crane.

[0060] S3.3: Assemble each component of the steel truss girder 2 with the cooperation of the gantry crane and the truck crane; install the main slide block 41 at the bottom of the steel truss girder 2 and make the main slide block 41 at the bottom of the steel truss girder 2 slide-connected to the slide rail 4 on the roadbed 1.

[0061] S4: Installation of the traction assembly: Install the traction assembly on the receiving-end abutment and connect the traction assembly to the steel truss girder 2; referring to Figure 1 and Figure 3 , the specific operation steps are as follows:

[0062] S4.1: Install the reaction seat 3 on the receiving-end abutment 12.

[0063] S4.2: Install two groups of jacks 31 on the side of the reaction seat 3 facing away from the starting-end abutment 11.

[0064] S4.3: Connect one end of the steel strand 32 to the inside of the hole-through jack 31.

[0065] S4.4: Anchor the end of the steel strand 32 far from the hole-through jack 31 to the corresponding connecting plate.

[0066] S5: Pulling construction of the steel truss girder 2: Drive the steel truss girder 2 to slide towards the receiving end abutment 12 through the traction assembly until both ends of the steel truss girder 2 are respectively located on the starting end abutment 11 and the receiving end abutment 12.

[0067] In step S5, when the hole-through jack 31 drives the steel truss girder 2 to slide onto the receiving end temporary support 14, stack a number of sandbags at one end of the steel truss girder 2 far from the receiving end abutment 12. Increase the self-weight of the end of the steel truss girder 2 far from the receiving end abutment 12 through the sandbags, which is beneficial to reducing the situation of downward deflection and displacement when the subsequent steel truss girder 2 crosses the existing road 10.

[0068] Refer to Figure 1 and Figure 2 , in step S5, when the traction assembly drives the steel truss girder 2 to slide out of the starting end temporary support 13, place a temporary jacking assembly at one end of the slide rail 4 of the receiving end temporary support 14 close to the starting end temporary support 13. The temporary jacking assembly includes a support base 5 and a main jack 51 vertically fixed at the top end of the support base 5; a number of horizontally arranged support rods 52 are fixedly connected to the bottom end of the support base 5, and the length direction of the support rods 52 is parallel to the length direction of the slide rail 4.

[0069] When the traction assembly drives the end of the steel truss girder 2 towards the receiving end abutment 12 to slide above the main jack 51, jack up the steel truss girder 2 through the main jack 51 until the bottom end face of the main sliding seat 41 at the end of the steel truss girder 2 is higher than the slide rail 4, and then continue to drive the steel truss girder 2 towards the receiving end abutment 12 through the traction assembly, so that the main sliding seat 41 can be smoothly stuck into the slide rail 4; it is beneficial to reducing the situation that the main sliding seat 41 at the bottom end of the steel truss girder 2 is difficult to slide into the slide rail 4 due to excessive downward deflection when the steel truss girder 2 spans the existing road 10 with too long a cantilever.

[0070] After the main sliding seat 41 of the steel truss girder 2 towards the receiving end abutment 12 slides into the slide rail 4, remove the temporary jacking assembly. Since a number of support rods 52 are fixed to the bottom of the support base 5, when the traction assembly drives the steel truss girder 2 to drive the support base 5 to slide on the slide rail 4, it is beneficial to reduce the friction between the support base 5 and the slide rail 4 through the support rods 52.

[0071] S6: Lower the steel truss girder 2 into place, and the specific operation steps are as follows:

[0072] S6.1: Install jacking jacks on the starting end abutment 11 and the receiving end abutment 12;

[0073] S6.2: Lift the steel truss beam 2 with the jacking jack until the main sliding seat 41 disengages from the sliding rail 4;

[0074] S6.3: Remove the main sliding seat 41 and the sliding rail 4;

[0075] S6.4: Install permanent bearings on the starting end abutment 11 and the receiving end abutment 12;

[0076] S6.5: The jacking jack drives the steel truss beam to move down to the permanent bearing;

[0077] S6.6: Remove the jacking jack and the traction assembly.

[0078] Embodiment 2

[0079] Refer to Figure 7 and Figure 8 In Embodiment 2, the difference from Embodiment 1 is that in step S2, after the steel truss beam 2 is assembled, a guiding and limiting mechanism is installed on the bottom plate of the steel truss beam 2. The guiding and limiting mechanism includes a support plate 6 fixed on the bottom plate of the steel truss beam 2. The support plate 6 is located at one end of the steel truss beam 2 facing the receiving end abutment 12. Two groups of guide rods 61 are slidably connected to the support plate 6. The two groups of guide rods 61 are arranged in parallel and the length direction of the guide rods 61 is parallel to the length direction of the steel truss beam 2. A driving assembly for driving the two groups of guide rods 61 to slide out of the steel truss beam 2 is further provided on the support plate 6.

[0080] Installation plates 64 are horizontally fixed at one ends of the two groups of guide rods 61 facing the receiving end abutment 12. Sub-jacks 65 are vertically fixed downward on the installation plates 64. The bottom ends of the piston rods of the sub-jacks 65 are fixed with sub-sliding seats 66, and the sub-sliding seats 66 are used for sliding connection and cooperation with the sliding rail 4.

[0081] A plurality of fixing plates 63 are further fixed on the upper surface of the support plate 6. The plurality of fixing plates 63 are evenly distributed along the length direction of the support plate 6. The two groups of guide rods 61 are all inserted through the plurality of fixing plates 63, which is convenient to improve the bending resistance of the guide rods 61 through the fixing plates 63.

[0082] Driving plates 611 are further fixed at the ends of the two groups of guide rods 61 away from the receiving end abutment 12. The two groups of guide rods 61 are perpendicularly fixed on the driving plates 611. The driving assembly 62 includes a reaction frame 621 fixed at one end of the support plate 6 away from the receiving end abutment 12. The reaction frame 621 is fixed with three driving jacks 622, and the piston rod ends of the three driving jacks 622 are fixedly connected to the side of the driving plate 611 facing away from the guide rods 61. By driving the piston rods of the driving jacks 622 to expand and contract, the guide rods 61 can be driven to slide.

[0083] In step S5, before the traction assembly drives the steel truss girder 2 to slide out of the starting-end temporary support 13, the driving assembly 62 is used to drive the two guide rods 61 to extend. When the traction assembly drives the steel truss girder 2 to slide until the secondary sliding seats 66 at the ends of the two guide rods 61 are located on the two secondary slide rails 4 of the receiving-end temporary support 14, the secondary jack 65 is used to drive the secondary sliding seats 66 to move downward until the secondary sliding seats 66 are slidably connected to the slide rails 4, which is beneficial to reducing the length of the cantilever when the steel truss girder 2 spans the existing highway, so that the steel truss girder 2 is not prone to downward deflection deformation when spanning the existing highway.

[0084] After the secondary sliding seats 66 are engaged with the slide rails of the receiving-end temporary support 14, the traction assembly continues to drive the steel truss girder 2 to slide towards the receiving-end abutment 12, and at the same time, the driving assembly 62 is used to drive the guide rods 61 to slide towards the steel truss girder 2 until the main sliding seat 41 at the end of the steel truss girder 2 is engaged with the slide rails of the receiving-end temporary support 14; it is beneficial to reduce the interference between the guide rods 61 extending from the end of the steel truss girder 2 and the traction assembly when one end of the steel truss girder 2 slides onto the receiving-end abutment 12.

[0085] With the setting of the secondary jack 65, when the main sliding seat 41 at the bottom of the steel truss girder 2 is lower than the surface of the slide rail 4, the secondary jack 65 can also be used to drive its piston rod to extend, thereby jacking up the guide rod 61 and the end of the steel truss girder 2 close to the receiving-end abutment 12, so that the bottom end face of the main sliding seat 41 at the end of the steel truss girder can be higher than the slide rail 4, facilitating the subsequent smooth sliding of the main sliding seat 41 into the slide rail 4.

[0086] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. Construction method of a steel truss beam dragging and sliding device across an expressway, characterized in that, Comprising: A steel truss girder towing and sliding device across an expressway, including a starting-end abutment (11) and a receiving-end abutment (12), where the starting-end abutment (11) and the receiving-end abutment (12) are respectively arranged on both sides of the existing road (10); A starting-end temporary support (13) and a receiving-end temporary support (14), where the starting-end temporary support (13) and the receiving-end temporary support (14) are respectively arranged on both sides of the existing road (10) and the starting-end temporary support (13) and the receiving-end temporary support (14) are located between the starting-end abutment (11) and the receiving-end abutment (12); A traction assembly, where the traction assembly is arranged on the receiving-end abutment (12) and is used to drive the steel truss girder (2) to move towards the receiving-end abutment (12); Two groups of parallel slide rails (4) are laid on the starting-end abutment (11), the receiving-end abutment (12), the starting-end temporary support (13), the receiving-end temporary support (14), and the roadbed (1) near the starting-end abutment (11); The steel truss girder (2) is located on the roadbed (1) near the starting-end abutment (11), and a number of main sliding seats (41) are arranged on both opposite sides of the bottom of the steel truss girder (2); the main sliding seats (41) are used for sliding connection and cooperation with the slide rails (4); A construction method using the above steel truss girder towing and sliding device across an expressway includes the following steps: S1: Construct the starting-end abutment (11), the receiving-end abutment (12), the starting-end temporary support (13), and the receiving-end temporary support (14) on both sides of the existing road (10); S2: Slide rail (4) installation: Lay the slide rail (4) on the roadbed (1) near the starting-end abutment (11), the starting-end abutment (11), the starting-end temporary support (13), the receiving-end temporary support (14), and the receiving-end abutment (12); S3: Assemble the steel truss girder (2) on the roadbed (1) near the starting-end abutment (11) and make the main sliding seats (41) at the bottom of the steel truss girder (2) slide-connected to the slide rails (4) on the roadbed (1); S4: Traction assembly installation: Install the traction assembly on the receiving-end abutment (12) and connect the traction assembly to the steel truss girder (2); S5: Steel truss girder (2) towing construction: Drive the steel truss girder (2) to slide towards the receiving-end abutment (12) through the traction assembly until both ends of the steel truss girder (2) are respectively located on the starting-end abutment (11) and the receiving-end abutment (12); S6: Steel truss girder (2) girder lowering construction; In step S2, after the steel truss girder (2) is assembled, a guiding and limiting mechanism is installed on the bottom plate of the steel truss girder (2). The guiding and limiting mechanism includes a support plate (6) arranged on the bottom plate of the steel truss girder (2). At one end of the support plate (6) facing the receiving-end abutment (12), two groups of guiding rods (61) are slidably connected. The length direction of the guiding rods (61) is parallel to the length direction of the steel truss girder (2). The support plate (6) is also provided with a driving component (62) for driving the two groups of guiding rods (61) to extend out of the steel truss girder (2). At one end of each guiding rod (61) facing the receiving-end abutment (12), a secondary jack (65) is vertically arranged downward. At the bottom end of the piston rod of the secondary jack (65), a secondary sliding seat (66) is arranged. The secondary sliding seat (66) is used for sliding connection and cooperation with the slide rail (4).

2. The construction method of a steel truss beam dragging and sliding device across an expressway according to claim 1, characterized in that: The traction component includes a reaction seat (3) fixed on the receiving-end abutment (12). Two groups of hole-through jacks (31) are arranged in parallel on the reaction seat (3). At the bottom of the steel truss girder (2), two connecting plates are arranged corresponding to the two groups of hole-through jacks (31). A steel strand (32) passes through the hole-through jack (31), and the end of the steel strand (32) far from the hole-through jack (31) is anchored on the corresponding connecting plate.

3. The construction method of a steel truss beam dragging and sliding device across an expressway according to claim 2, characterized in that: In step S5, when the traction component drives the steel truss girder (2) to slide out of the starting-end temporary support (13), a temporary jacking component is installed at one end of the slide rail (4) of the receiving-end temporary support (14) facing the starting-end temporary support (13). The temporary jacking component includes a support seat (5). At the top end of the support seat (5), a main jack (51) is vertically arranged upward.

4. The construction method of a steel truss beam dragging and sliding device across an expressway according to claim 3, characterized in that: At the bottom end of the support seat (5), a plurality of support rods (52) are horizontally fixed. The axial direction of the support rods (52) is perpendicular to the length direction of the slide rail (4).

5. The construction method of a steel truss beam dragging and sliding device across an expressway according to claim 1, characterized in that: In step S5, when the traction component drives the steel truss girder (2) to extend out of the starting-end temporary support (13), sandbags are placed at one end of the steel truss girder (2) far from the receiving-end abutment (12) to increase the counterweight at one end of the steel truss girder (2) far from the receiving-end abutment (12).

6. The construction method of a steel truss beam dragging and sliding device across an expressway according to claim 1, characterized in that: In step S2, after the slide rail (4) is installed, butter is smeared on the surface of the slide rail (4).

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