An assembled steel trestle structure and a steel trestle construction method

Abstract

The application relates to a fabricated steel trestle structure and a steel trestle construction method, which are applied to the technical field of fabricated trestle and comprise a plurality of steel pipe pile foundations, a plurality of prefabricated guardrails and a prefabricated bridge deck layer connected at the head and tail, two adjacent prefabricated bridge deck layers are arranged on the steel pipe pile foundations through connecting mechanisms, the two adjacent prefabricated bridge deck layers are connected through fastening mechanisms, and the prefabricated guardrails are arranged on the prefabricated bridge deck layer through clamping mechanisms; each prefabricated bridge deck layer comprises a Bailey frame layer, a top plate, a pair of side plates and a plurality of supporting rods, the Bailey frame layer is arranged on the connecting mechanism, the plurality of supporting rods are arranged on the Bailey frame layer, and a spacing is left between two adjacent supporting rods; the top plate is simultaneously connected to the top walls of the plurality of supporting rods, the plurality of supporting rods are located between the pair of side plates, the side plates are simultaneously connected to the plurality of supporting rods, and one end of the clamping mechanism, which is far away from the prefabricated guardrail, is arranged on the side plate. The application has the effect of improving the on-site construction efficiency.

Description

A prefabricated steel trestle structure and its construction method Technical Field

[0001] This application relates to the technical field of prefabricated trestle bridges, and in particular to a prefabricated steel trestle bridge structure and a steel trestle bridge construction method. Background Technology

[0002] A trestle is a bridge-shaped structure used in stations, ports, mines, or factories for loading and unloading goods, picking up and dropping off passengers, or for temporary bridge structures used for traffic, machinery placement, and overhead operations at construction sites. In civil engineering, it refers to temporary bridge facilities built for transporting materials, equipment, and personnel. Trestles are classified into wooden trestles and steel trestles based on the materials used. Steel trestles have advantages such as high load-bearing capacity, strong structural rigidity, and long service life, and can be configured into various types and for different purposes according to different span requirements.

[0003] The steel trestle bridge in the relevant technology includes a steel main beam frame, Bailey bridges, guardrails, several steel pipe piles, I-beams, and patterned steel plates. Horizontal and diagonal braces are welded between the steel pipe piles to form a stable, matrix-arranged steel pipe pile foundation. The steel main beam frame is welded to the top of the steel pipe piles. The Bailey bridges are fixed to the steel main beam frame with several bolts. Several I-beams are bolted to the Bailey bridges. Patterned steel plates are welded to the I-beams, and guardrails are welded to the patterned steel plates.

[0004] Regarding the aforementioned technologies, the inventors believe that when constructing a steel trestle bridge, the components are connected as a whole by welding, which involves a large amount of on-site welding work and affects the construction progress. Summary of the Invention

[0005] To address the issue of excessive on-site welding work affecting construction progress during the construction of steel trestle bridges, this application provides a prefabricated steel trestle bridge structure and a steel trestle bridge construction method.

[0006] In the first aspect, this application provides a prefabricated steel trestle structure, which adopts the following technical solution:

[0007] A prefabricated steel trestle structure includes several steel pipe pile foundations, several prefabricated guardrails, and prefabricated bridge deck layers connected end to end. Two adjacent prefabricated bridge deck layers are set on the steel pipe pile foundations through a connecting mechanism, and two adjacent prefabricated bridge deck layers are connected through a fastening mechanism. The prefabricated guardrails are set on the prefabricated bridge deck layers through a snap-fit ​​mechanism.

[0008] Each of the precast bridge deck layers includes a Bailey bridge layer, a top slab, a pair of side slabs, and a number of support rods. The Bailey bridge layer is mounted on the connecting mechanism, and the number of support rods is mounted on the Bailey bridge layer with a gap between adjacent support rods.

[0009] The top plate is simultaneously connected to the top wall of several support rods, and the several support rods are all located between a pair of side plates. The side plates are simultaneously connected to several support rods, and the end of the snap-fit ​​mechanism away from the prefabricated guardrail is located on the side plate.

[0010] By adopting the above technical solutions, the prefabricated bridge deck layer can be manufactured in advance according to design requirements, reducing the time spent on assembling Bailey bridge frames, fixing individual I-beams to the Bailey beams with bolts, and welding checkered steel plates to the I-beams on-site, thus shortening on-site construction time. Similarly, by using a snap-fit ​​mechanism to install prefabricated guardrails onto the prefabricated bridge deck layer, replacing on-site splicing and welding of guardrails, on-site construction time can be further shortened.

[0011] In addition, fastening and connecting mechanisms can improve the connection between two adjacent precast bridge deck layers, enhance the overall integrity of the steel trestle, and make the steel trestle more stable.

[0012] Optionally, the connecting mechanism includes a connecting plate, several connecting frames, and U-bolts, with one side of the connecting frame disposed on the connecting plate and the other side of the connecting frame disposed on the steel pipe pile foundation;

[0013] The connecting plate is provided with several through holes, the Bailey bridge layer is placed on the connecting plate, and the U-bolt passes through the through holes to connect the Bailey bridge layer to the connecting plate.

[0014] By adopting the above technical solution, after the precast bridge deck layer is hoisted and placed on the connecting plate, it is connected to the already installed precast bridge deck layer through the fastening mechanism, and then the hoisted precast bridge deck layer can be fixed on the connecting frame by U-bolts, making the steel trestle bridge more stable as a whole.

[0015] Optionally, the fastening mechanism includes a rotating shaft, a pair of fastening components, and an anti-rotation component for limiting the rotation of the rotating shaft. The rotating shaft is rotatably connected to one of the support rods, and the end of the anti-rotation component away from the rotating shaft is disposed on the side plate.

[0016] The fastening assembly includes a first fixing post, a second fixing post, a take-up roller, and a pull rope. The first fixing post is disposed on one of the Bailey bridge layers, and the second fixing post is disposed on the other Bailey bridge layer.

[0017] The take-up roller is mounted on the rotating shaft, one end of the pull rope is mounted on the take-up roller, the other end of the pull rope is mounted on the first fixed post, and the pull rope overlaps the second fixed post.

[0018] By adopting the above technical solution, the pull rope is wound onto the winding roller by rotating the shaft. During the winding process, the pull rope pulls the hoisted precast bridge deck towards the precast bridge deck that has already been installed, and then fixes it to the connecting plate. Furthermore, the anti-rotation component reduces the possibility of the shaft reversing, thereby improving the overall integrity of the steel trestle and making it more stable.

[0019] Optionally, the anti-rotation assembly includes a ratchet, an anti-rotation pawl, and an anti-rotation spring. A fixed plate is provided on the side plate, the ratchet is disposed on the rotating shaft, the anti-rotation pawl is hinged to the fixed plate, one end of the anti-rotation pawl away from the fixed plate abuts against the ratchet, and the anti-rotation spring is connected between the fixed plate and the anti-rotation pawl.

[0020] By adopting the above technical solution, the anti-rotation pawl is pressed against the ratchet by the elastic force of the anti-rotation spring, thus limiting the ratchet and reducing the possibility of the shaft reversing. In turn, it can reduce the possibility of two adjacent precast bridge deck layers moving away from each other during use.

[0021] Optionally, the prefabricated guardrail includes several railings, and a transmission rod is hinged between two adjacent railings. The transmission rod is used to adjust the distance between two adjacent railings.

[0022] The top plate is provided with several insertion holes, the railing passes through the insertion holes, one end of the locking mechanism is provided on the railing, and the other end of the locking mechanism is provided on the side plate.

[0023] By adopting the above technical solution, the length of the prefabricated guardrail can be adjusted through the transmission rod. During transportation, the prefabricated guardrail is in a retracted state to facilitate handling and transportation.

[0024] When prefabricated guardrails need to be installed on the prefabricated bridge deck, workers stretch the prefabricated guardrails and use a snap-fit ​​mechanism to snap the guardrails into the slots. Compared with on-site splicing and welding of guardrails, this can save on-site construction time and has better operational convenience.

[0025] Optionally, the snap-fit ​​mechanism includes a snap-fit ​​component for connecting the railing to the top plate, a clamping component for clamping the railing, and a driving component for driving the clamping component. The snap-fit ​​component is disposed on the railing, the driving component is disposed on the side plate, and the clamping component is disposed on the driving component.

[0026] By adopting the above technical solution, the staff inserts the railing into the socket, and then the snap-fit ​​component snaps the railing into the socket. During the process of inserting the railing into the socket, the drive component is activated, and the drive component drives the clamping component to clamp the part of the railing inserted into the socket, thereby further improving the stability of the railing.

[0027] Optionally, the snap-fit ​​assembly includes a connecting plate, a push rod disposed on the connecting plate, a snap-fit ​​rod, and a plurality of snap-fit ​​springs; the railing has a cavity, and one end of the snap-fit ​​spring away from the connecting plate is disposed on the cavity wall of the cavity.

[0028] The push rod and the locking rod slide through the cavity wall of the cavity at the ends away from the connecting plate. The length of the locking rod is less than the length of the push rod. The locking rod abuts against the bottom wall of the top plate, and the push rod is located above the top plate.

[0029] By adopting the above technical solution, the spring force can push the locking rod out of the cavity, and pushing the push rod can retract the locking rod back into the cavity. The worker pushes the push rod to retract the locking rod back into the cavity, then inserts the railing into the insertion hole, and then releases the push rod, so that the top plate is locked between the push rod and the locking rod, thereby locking the railing onto the precast bridge deck.

[0030] Optionally, the clamping assembly includes a pair of clamping racks slidably disposed on the side plate, the clamping racks being provided with clamping rods, the clamping racks being connected to the driving assembly, and the clamping rods being pressed against the railing.

[0031] By adopting the above technical solution, the drive component drives a pair of clamps to move toward each other or away from each other. When the railing is inserted into the hole, the pair of clamps abut against the railing, thereby further improving the stability of the railing on the precast bridge deck.

[0032] Optionally, the drive assembly includes a rotating column, a gear, a drive rack, a drive plate, a support plate, and a plurality of return springs connected between the support plate and the drive plate. The rotating column is rotatably connected to the side plate, the gear is disposed on the rotating column, the gear is located between a pair of clamping racks, and the clamping racks are all meshed with the gear.

[0033] The drive rack is slidably disposed on the side plate and meshes with the gear, the drive plate is connected to the drive rack, and the support plate is disposed on the side plate.

[0034] By adopting the above technical solution, since the gear is located between a pair of clamping racks and the clamping racks are meshed with the gear, when the gear rotates, it can drive the pair of clamping racks to move in a direction that is closer to or further away from each other.

[0035] When the railing is inserted into the socket, the drive plate is pressed down, causing the drive rack to move downwards. This rotates the gear, causing a pair of clamping rods to press against the railing. The locking rods reduce the likelihood of the railing rising, thus securing it in place. When the railing is pulled out of the socket, a return spring resets the drive plate, allowing the clamping assembly to hold the railing in place again.

[0036] Secondly, this application provides a construction method for a prefabricated steel trestle bridge structure, employing the following technical solution:

[0037] A construction method for a prefabricated steel trestle bridge structure includes the following steps: S1, leveling the site, surveying and setting out, determining the actual location of the steel pipe pile foundation according to the design drawings, and directing the positioning boat to position it;

[0038] S2. Construct bridge abutments;

[0039] S3. Use a crane to lift the steel pipe piles of the steel pipe pile foundation and place them in the determined position. Use a pile hammer to drive the steel pipe piles into the designated position. Complete the piling of the steel pipe pile foundation one by one, and cut a groove on the top of the steel pipe pile.

[0040] S4. Use a crane to hoist the connecting mechanism onto the steel pipe pile foundation, place the connecting frame in the groove, and weld the connecting frame to the steel pipe pile;

[0041] S5. A precast bridge deck layer is hoisted onto the bridge abutment and connecting frame using a crane, and the precast bridge deck layer is fixed to the connecting plate using several U-bolts.

[0042] S6. Hoist another precast bridge deck layer onto a pair of connecting frames using a crane. Wrap the pull rope around the second fixed column. Put the auxiliary rotating tool onto the rotating shaft so that the locking block on the rotating shaft locks into the auxiliary rotating tool. Put the sling onto the auxiliary rotating tool. Use a winch to pull the sling to rotate the rotating shaft until the precast bridge deck layer is pressed against the installed precast bridge deck layer. Then remove the auxiliary rotating tool.

[0043] S7. Repeat S6 until the precast bridge deck layer overlaps onto another bridge abutment, and fix the precast bridge deck layer onto the bridge abutment.

[0044] S8. Stretch the prefabricated guardrail so that each railing is aligned with the insertion hole. The worker presses the push rod and inserts the railing into the insertion hole at the same time. Release the push rod to complete the installation of the prefabricated guardrail.

[0045] By adopting the above technical solution, the eight steps can be divided into three stages. The first stage involves the construction of the steel pipe pile foundation and the fixing of the connecting mechanism to the steel pipe pile foundation. The second stage involves hoisting the precast bridge deck layer, detachably attaching it to the connecting mechanism, and connecting adjacent precast bridge deck layers to increase the overall integrity of the steel trestle bridge and make it more stable. Since the precast bridge deck layer is prefabricated, on-site welding time can be saved, shortening on-site construction time. The third stage involves installing the precast guardrails. Workers only need to push the push rod to insert the guardrail into the insertion hole to complete the installation of the precast guardrails, which has good operational convenience and can further shorten on-site construction time.

[0046] In summary, this application includes at least one of the following beneficial technical effects:

[0047] 1. Precast bridge deck layers are manufactured in advance according to design requirements, which can reduce the time spent on assembling Bailey bridges, fixing several I-beams to the Bailey beams one by one with bolts, and welding patterned steel plates to the I-beams on the construction site, thereby shortening the on-site construction time.

[0048] 2. Workers only need to push the push rod to insert the railing into the hole to complete the installation of the prefabricated guardrail. Compared with on-site splicing and welding of guardrails, it has good operation convenience and can further shorten the on-site construction time.

[0049] 3. Fastening and connecting mechanisms can improve the connection between two adjacent precast bridge deck layers, enhance the overall integrity of the steel trestle, and make the steel trestle more stable. Attached Figure Description

[0050] Figure 1 is a schematic diagram of the prefabricated steel trestle structure in an embodiment of this application.

[0051] Figure 2 is a cross-sectional view of the prefabricated steel trestle structure in an embodiment of this application.

[0052] Figure 3 is an enlarged view of part A in Figure 1.

[0053] Figure 4 is an enlarged view of part B in Figure 1.

[0054] Figure 5 is a cross-sectional view of the prefabricated steel trestle structure in an embodiment of this application from another perspective.

[0055] Figure 6 is an enlarged view of part C in Figure 2.

[0056] Figure 7 is an enlarged view of part D in Figure 5.

[0057] Attached reference numerals: 1. Steel pipe pile foundation; 2. Precast bridge deck layer; 21. Bailey bridge layer; 22. Top slab; 23. Side slab; 24. Support rod; 3. Precast guardrail; 31. Railing; 32. Transmission rod; 4. Connecting mechanism; 41. Connecting plate; 411. Through-hole; 42. Connecting frame; 43. U-bolt; 5. Fastening mechanism; 51. Rotating shaft; 52. Fastening assembly; 521. First fixed column; 522. Second fixed column; 523. Guide column; 524. Take-up roller; 525. Pull rope; 53. Anti-rotation assembly; 531. Ratchet; 5 32. Anti-rotation claw; 533. Anti-rotation spring; 534. Fixing plate; 6. Snap-fit ​​mechanism; 61. Snap-fit ​​assembly; 611. Connecting plate; 612. Push rod; 613. Snap-fit ​​rod; 614. Snap-fit ​​spring; 62. Clamping assembly; 621. Clamping rack; 622. Clamping rod; 63. Drive assembly; 631. Rotating column; 632. Gear; 633. Drive rack; 634. Drive plate; 635. Support plate; 636. Return spring; 7. Auxiliary rotation tool; 71. Rotary handle; 72. Turntable; 721. Snap-fit ​​hole; 8. Snap-fit ​​block. Detailed Implementation

[0058] The present application will be further described in detail below with reference to Figures 1-7.

[0059] This application discloses a prefabricated steel trestle structure.

[0060] Referring to Figures 1 and 2, a prefabricated steel trestle structure includes several steel pipe pile foundations 1, prefabricated bridge deck layers 2, prefabricated guardrails 3, connecting mechanisms 4, fastening mechanisms 5, and snap-fit ​​mechanisms 6. The prefabricated guardrails 3 are fixed to the prefabricated bridge deck layers 2 via the snap-fit ​​mechanisms 6. Two adjacent prefabricated bridge deck layers 2 are fixed to a single steel pipe pile foundation 1 via the connecting mechanisms 4, and are connected via the fastening mechanisms 5. This improves the connection effect between adjacent prefabricated bridge deck layers 2, enhances the overall integrity of the prefabricated steel trestle, and makes the prefabricated steel trestle more stable. The prefabricated bridge deck layers 2 and prefabricated guardrails 3 are prefabricated according to design requirements, eliminating the need for on-site assembly and welding, thus shortening on-site construction time and improving construction efficiency.

[0061] Referring to Figures 1 and 3, the connecting mechanism 4 includes a connecting plate 41, several U-bolts 43, and a connecting frame 42 fixed on the connecting plate 41. The steel pipe piles of the steel pipe pile foundation 1 have grooves for the connecting frame 42 to be inserted into. The connecting frame 42 is placed in the grooves and welded to the steel pipe piles. The connecting plate 41 has several through holes 411, the length direction of which is parallel to the length direction of the prefabricated steel trestle bridge. A pair of prefabricated bridge deck layers 2 are placed on the connecting plate 41. Several U-bolts 43 pass through the through holes 411 and abut against the prefabricated bridge deck layers 2. Then, the nuts of the U-bolts 43 are tightened to fix the prefabricated bridge deck layers 2 to the connecting plate 41. During on-site construction, the connecting mechanism 4 is hoisted onto the steel pipe pile foundation 1 as a whole, and the connecting frame 42 is welded to the steel pipe pile foundation 1, which reduces the amount of welding work on-site.

[0062] Referring to Figures 1 and 2, the prefabricated bridge deck layer 2 includes a Bailey bridge frame layer 21, a top plate 22, and several support rods 24 fixed to the Bailey bridge frame layer 21. A gap is left between adjacent support rods 24. The top plate 22 is simultaneously fixed to the top wall of the support rods 24. The Bailey bridge frame layer 21 is fixed to the connecting plate 41 by several U-bolts 43, thus fixing the prefabricated bridge deck layer 2 to the steel pipe pile foundation 1. The length direction of the support rods 24 is perpendicular to the length direction of the prefabricated steel trestle bridge, and a side plate 23 is simultaneously fixed to both ends of each support rod 24. The prefabricated bridge deck layer 2 is prefabricated according to design requirements, reducing the construction steps of assembling Bailey bridge frames, fixing several I-beams to the Bailey beams one by one with bolts, and welding checkered steel plates to the I-beams on the construction site. This shortens on-site construction time and improves on-site construction efficiency.

[0063] Referring to Figures 1 and 4, for two adjacent precast bridge deck layers 2, one end of the fastening mechanism 5 is fixed to one of the precast bridge deck layers 2, and the other end of the fastening mechanism 5 is fixed to the other precast bridge deck layer 2, so as to improve the connection effect between the two adjacent precast bridge deck layers 2 and make the overall prefabricated steel trestle bridge more stable.

[0064] Referring to Figures 4 and 5, the fastening mechanism 5 includes a rotating shaft 51, a pair of fastening components 52, and an anti-rotation component 53. The rotating shaft 51 is rotatably connected to one of the support rods 24. A pair of locking blocks 8 are fixed on the rotating shaft 51. The top plate 22 is located between the pair of anti-rotation components 53, which are located between the pair of fastening components 52. The fastening component 52 includes a first fixing post 521, a second fixing post 522, a guide post 523, a take-up roller 524, and a pull rope 525. The first fixing post 521 is fixed to one of the Bailey bridge layers 21 and is located directly below the rotating shaft 51. The second fixing post 522 is at the same horizontal height as the first fixing post 521 and is fixed to another Bailey bridge. The guide post 523 is fixed to another side plate 23 and is located directly above the second fixing post 522.

[0065] The take-up roller 524 is coaxially connected to the rotating shaft 51. One end of the pull rope 525 is fixed to the take-up roller 524, and the other end of the pull rope 525 is fixed to the first fixed post 521. The pull rope 525 overlaps the second fixed post 522 and the guide post 523. The worker puts the auxiliary rotating tool 7 onto the rotating shaft 51 and engages it with the locking block 8. The auxiliary rotating tool 7 is driven to make the rotating shaft 51 rotate. The take-up roller 524 winds up the pull rope 525, pressing the hoisted precast bridge deck layer 2 against the installed precast bridge deck layer 2, thereby improving the overall integrity of the prefabricated steel trestle bridge and thus improving its stability.

[0066] During on-site construction, workers only need to put the auxiliary rotating tool 7 onto the rotating shaft 51 and drive the auxiliary rotating tool 7 to make the rotating shaft 51 rotate. It has good ease of operation and can improve construction efficiency.

[0067] In addition, under the guidance of the guide column 523, the precast bridge deck layer 2 can be moved by a smaller driving force, which can also improve the stability when moving the precast bridge deck layer 2.

[0068] Referring to Figures 1 and 4, the anti-rotation assembly 53 includes a ratchet 531, an anti-rotation pawl 532, an anti-rotation spring 533, and a fixing plate 534. The ratchet 531 is coaxially connected to the rotating shaft 51. The fixing plate 534 is fixed to the side plate 23. One end of the anti-rotation spring 533 is fixed to the fixing plate 534, and the other end is fixed to the anti-rotation pawl 532. One end of the anti-rotation pawl 532 is hinged to the fixing plate 534, and the end of the anti-rotation pawl 532 away from the fixing plate 534 is pressed against the ratchet 531 by the elastic force of the anti-rotation spring 533. By cooperating with the ratchet 531, the rotating shaft 51 is limited, thereby reducing the possibility of the rotating shaft 51 reversing. This, in turn, reduces the possibility of two adjacent prefabricated bridge deck layers 2 moving away from each other during use, improving the stability of the prefabricated steel trestle bridge.

[0069] Referring to Figure 1, the prefabricated guardrail 3 includes several railings 31 and a transmission rod 32 hinged between two adjacent railings 31. The length of the prefabricated guardrail 3 can be adjusted by the transmission rod 32. During transportation, the prefabricated guardrail 3 is in a retracted state to facilitate handling and transportation.

[0070] Referring to Figures 6 and 7, the snap-fit ​​mechanism 6 includes a snap-fit ​​component 61, a clamping component 62, and a driving component 63. The top plate 22 is provided with several insertion holes for the railing 31 to pass through. The railing 31 is provided with a cavity. One end of the snap-fit ​​component 61 is located in the cavity, and the other end of the snap-fit ​​component 61 passes through the cavity wall and snaps onto the top plate 22 to fix the railing 31.

[0071] The drive assembly 63 is mounted on the side plate 23. During the process of inserting the railing 31 into the insertion hole, the drive assembly 63 is driven to move, so that the clamping assembly 62 clamps the part of the railing 31 inserted into the insertion hole, thereby further improving the fixation stability of the railing 31.

[0072] Referring to Figures 6 and 7, the snap-fit ​​assembly 61 includes a connecting plate 611, a push rod 612, a snap-fit ​​rod 613, and several snap-fit ​​springs 614. One end of each snap-fit ​​spring 614 is fixed to the cavity wall, and the other end is fixed to the connecting plate 611. Both sides of the connecting plate 611 are in contact with the cavity wall, allowing the connecting plate 611 to slide more stably. The push rod 612 and the snap-fit ​​rod 613 are both fixed to the connecting plate 611. The ends of the push rod 612 and the snap-fit ​​rod 613 away from the connecting plate 611 slide through the cavity wall, and the length of the snap-fit ​​rod 613 is less than the length of the push rod 612. Thus, under the elastic force of the snap-fit ​​springs 614, the snap-fit ​​rod 613 can be extended out of the cavity, and pushing the push rod 612 can retract the snap-fit ​​rod 613 back into the cavity.

[0073] When installing the precast guardrail 3 onto the precast bridge deck layer 2, the workers stretch the precast guardrail 3 so that each rail 31 is aligned with the insertion hole. Then, the workers press the push rod 612, causing the locking rod 613 to retract into the cavity, inserting the rail 31 into the insertion hole. Then, the push rod 612 is released, and under the elastic force of the locking spring 614, the locking rod 613 extends out of the cavity, abutting against the bottom wall of the top plate 22. The push rod 612 abuts against the top wall of the top plate 22, fixing the rail 31 in place. This method offers excellent ease of operation. Since there is no need to splice or weld the guardrail on-site, it saves on-site construction time and improves construction efficiency.

[0074] Referring to Figures 6 and 7, the drive assembly 63 includes a rotating column 631, a gear 632, a drive rack 633, a drive plate 634, a support plate 635, and several return springs 636. The clamping assembly 62 includes a pair of clamping racks 621 and a clamping rod 622. The rotating column 631 is rotatably connected to the side plate 23, and the gear 632 is coaxially connected to the rotating column 631. The drive rack 633 meshes with the gear 632. A guide block is fixed on the drive rack 633, and the side plate 23 is provided with a guide groove for the guide block to slide. The guide block is placed in the guide groove, and the engagement of the guide block with the guide groove allows the drive rack 633 to rise and fall more stably.

[0075] The drive plate 634 is fixed to the bottom end of the drive rack 633, the support plate 635 is fixed on the side plate 23 and located below the drive plate 634, and the return spring 636 is fixed between the support plate 635 and the drive plate 634. When the railing 31 is inserted into the hole, the drive plate 634 is pressed down, causing the drive rack 633 to move downward, thereby allowing the gear 632 to rotate.

[0076] The railing 31 is located between a pair of clamping rods 622, each clamping rod 622 being fixedly connected to a clamping rack 621. A gear 632 is located between the pair of clamping racks 621, and each clamping rack 621 meshes with a gear 632. Therefore, when the driving rack 633 drives the gear 632 to rotate, the clamping racks 621 can move closer to or further away from each other, allowing the pair of clamping rods 622 to clamp or release the railing 31. Limiting blocks are fixed to the clamping racks 621, and a pair of limiting grooves are provided on the side plate 23 for the limiting blocks to slide. The limiting blocks are placed in the limiting grooves, allowing the clamping racks 621 to mesh more stably with the gears 632.

[0077] When the railing 31 is inserted into the insertion hole, the drive plate 634 is pressed down, and the drive rack 633 moves downward, thereby driving the gear 632 to rotate. This causes a pair of clamping rods 622 to press against the railing 31, limiting its position. Simultaneously, the top plate 22 engages between the clamping rod 613 and the push rod 612, reducing the possibility of the railing 31 rising and thus improving its stability on the precast bridge deck layer 2. After pressing the push rod 612 to pull the railing 31 out of the insertion hole, the return spring 636 resets the drive plate 634, causing the drive rack 633 to reset as well. This allows the gear 632 to rotate and the clamping rods 622 to hold the railing 31 in place the next time it is inserted.

[0078] The implementation principle of a prefabricated steel trestle structure in this application embodiment is as follows:

[0079] First, a prefabricated bridge deck layer 2 is placed on the connecting plate 41 and fixed to the connecting plate 41 with U-bolts 43. Then, another prefabricated bridge deck layer 2 is hoisted and placed on the connecting plate 41. The pull rope 525 is attached to the second fixing column 522 and guide column 523 of the adjacent prefabricated bridge deck layer 2. The worker puts the auxiliary rotating tool 7 on the rotating shaft 51 and engages it with the locking block 8. The worker drives the auxiliary rotating tool 7 to rotate the rotating shaft 51, pressing the hoisted prefabricated bridge deck layer 2 against the fixed prefabricated bridge deck layer 2. Then, the hoisted prefabricated bridge deck layer 2 is fixed to the connecting plate 41 with U-bolts 43. This improves the overall integrity and stability of the prefabricated steel trestle bridge. The prefabricated bridge deck layer 2 is manufactured in advance according to the design requirements, which can reduce the construction steps of splicing Bailey frames, fixing several I-beams one by one to Bailey beams with bolts, and welding patterned steel plates to I-beams on the construction site, thereby shortening the on-site construction time and improving construction efficiency.

[0080] When installing prefabricated guardrails 3 onto the prefabricated bridge deck layer 2, workers stretch the prefabricated guardrails 3 so that each rail 31 is aligned with its insertion hole. Then, workers press the push rod 612 to insert the rail 31 into the insertion hole. After releasing the push rod 612, the snap-fit ​​rod 613 extends out of the cavity under the elastic force of the snap-fit ​​spring 614, abutting against the bottom wall of the top plate 22. The push rod 612 abuts against the top wall of the top plate 22, thus fixing the rail 31 in place. This method offers excellent ease of operation. Compared to on-site splicing and welding of guardrails, prefabricated guardrails save on-site construction time and improve construction efficiency.

[0081] This application also discloses a construction method for a prefabricated steel trestle bridge structure.

[0082] A construction method for a prefabricated steel trestle bridge structure includes the following steps:

[0083] S1. Level the site, measure and lay out the layout, determine the actual position of the steel pipe pile foundation 1 according to the design drawings, and direct the positioning boat to position it.

[0084] S2. Construct bridge abutments.

[0085] S3. The steel pipe piles of the steel pipe pile foundation 1 are lifted by a crawler crane and placed in the determined position. The steel pipe piles are driven into the designated position in the ground by a pile hammer. The pile driving of the steel pipe piles of the steel pipe pile foundation 1 is completed one by one. A groove is cut on the top of the steel pipe pile for the connecting frame 42 to be inserted.

[0086] S4. Use a crawler crane to hoist the connecting plate 41 onto the steel pipe pile foundation 1, place the connecting frame 42 in the groove, and weld the connecting frame 42 onto the steel pipe pile.

[0087] S5. A precast bridge deck layer 2 is hoisted onto the bridge abutment and connecting frame 42 by a crawler crane, and the precast bridge deck layer 2 is fixed onto the connecting plate 41 by a number of U-bolts 43.

[0088] S6. Using a crawler crane, hoist another precast bridge deck layer 2 onto a pair of connecting frames 42. Wrap the pull rope 525 around the second fixed column 522 and guide column 523. Fit the auxiliary rotating tool 7 onto the rotating shaft 51. The auxiliary rotating tool 7 includes a handle 71 and a turntable 72 fixed to the handle 71. The turntable 72 has a locking hole 721 for the rotating shaft 51 and the locking block 8 to pass through. After the turntable 72 is fitted onto the rotating shaft 51, the locking block 8 engages in the locking hole 721. Then, a sling is fitted onto the auxiliary rotating tool 7. A winch pulls the sling to rotate the rotating shaft 51 until the precast bridge deck layer 2 is firmly against the installed precast bridge deck layer 2. Then, remove the auxiliary rotating tool 7.

[0089] S7. Repeat S6 until the precast bridge deck layer 2 overlaps onto another bridge abutment, and fix the precast bridge deck layer 2 onto the bridge abutment.

[0090] S8. The workers stretch the prefabricated guardrail 3 so that each railing 31 is aligned with the insertion hole. The workers press the push rod 612 and insert the railing 31 into the insertion hole. Then, they release the push rod 612 to complete the installation of the prefabricated guardrail 3. After that, the workers weld a crossbar between two adjacent railings 31 on two adjacent prefabricated bridge deck layers.

[0091] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated steel trestle bridge structure, comprising several steel pipe pile foundations (1), characterized in that: It also includes several prefabricated guardrails (3) and prefabricated bridge deck layers (2) connected end to end. Two adjacent prefabricated bridge deck layers (2) are set on the steel pipe pile foundation (1) through a connecting mechanism (4). Two adjacent prefabricated bridge deck layers (2) are connected by a fastening mechanism (5). The prefabricated guardrails (3) are set on the prefabricated bridge deck layers (2) through a snap-fit ​​mechanism (6). Each prefabricated bridge deck layer (2) includes a Bailey bridge layer (21), a top plate (22), a pair of side plates (23), and several support rods (24). The Bailey bridge layer (21) is mounted on the connecting mechanism (4), and a plurality of support rods (24) are mounted on the Bailey bridge layer (21), with a gap between adjacent support rods (24); the top plate (22) is simultaneously connected to the top wall of the plurality of support rods (24), and the plurality of support rods (24) are all located between a pair of side plates (23), and the side plates (23) are simultaneously connected to the plurality of support rods (24); the snap-fit ​​mechanism (6) is located away from the prefabricated guardrail (3). The fastening mechanism (5) includes a rotating shaft (51), a pair of fastening components (52), and an anti-rotation component (53) for limiting the rotation of the rotating shaft (51). The rotating shaft (51) is rotatably connected to one of the support rods (24), and the anti-rotation component (53) is located on the side plate (23) at one end away from the rotating shaft (51). The fastening component (52) includes a first fixing post (521), a second fixing post (522), a take-up roller (524), and a winding roller. A pull rope (525) is provided. The first fixing post (521) is provided on one of the Bailey bridge layers (21), and the second fixing post (522) is provided on the other Bailey bridge layer (21). The take-up roller (524) is provided on the rotating shaft (51). One end of the pull rope (525) is provided on the take-up roller (524), and the other end of the pull rope (525) is provided on the first fixing post (521). The pull rope (525) overlaps the second fixing post (522).

2. The prefabricated steel trestle structure according to claim 1, characterized in that: The connecting mechanism (4) includes a connecting plate (41), several connecting frames (42) and U-bolts (43). One side of the connecting frame (42) is located on the connecting plate (41), and the other side of the connecting frame (42) is located on the steel pipe pile foundation (1). The connecting plate (41) is provided with several through holes (411). The Bailey bridge layer (21) is placed on the connecting plate (41), and the U-bolts (43) pass through the through holes (411) to connect the Bailey bridge layer (21) to the connecting plate (41).

3. The prefabricated steel trestle structure according to claim 1, characterized in that: The anti-rotation assembly (53) includes a ratchet (531), an anti-rotation pawl (532), and an anti-rotation spring (533). A fixed plate (534) is provided on the side plate (23). The ratchet (531) is located on the rotating shaft (51). The anti-rotation pawl (532) is hinged to the fixed plate (534). One end of the anti-rotation pawl (532) away from the fixed plate (534) abuts against the ratchet (531). The anti-rotation spring (533) is connected between the fixed plate (534) and the anti-rotation pawl (532).

4. The prefabricated steel trestle structure according to claim 1, characterized in that: The prefabricated guardrail (3) includes several railings (31), and a transmission rod (32) is hinged between two adjacent railings (31). The transmission rod (32) is used to adjust the distance between two adjacent railings (31). The top plate (22) is provided with several insertion holes, through which the railings (31) pass. One end of the snap-fit ​​mechanism (6) is located on the railing (31), and the other end of the snap-fit ​​mechanism (6) is located on the side plate (23).

5. The prefabricated steel trestle structure according to claim 4, characterized in that: The snap-fit ​​mechanism (6) includes a snap-fit ​​assembly (61) for connecting the railing (31) to the top plate (22), a clamping assembly (62) for clamping the railing (31), and a driving assembly (63) for driving the clamping assembly (62). The snap-fit ​​assembly (61) is disposed on the railing (31), the driving assembly (63) is disposed on the side plate (23), and the clamping assembly (62) is disposed on the driving assembly (63).

6. The prefabricated steel trestle structure according to claim 5, characterized in that: The snap-fit ​​assembly (61) includes a connecting plate (611), a push rod (612) disposed on the connecting plate (611), a snap-fit ​​rod (613) and a plurality of snap-fit ​​springs (614). The railing (31) has a cavity. One end of the snap-fit ​​spring (614) away from the connecting plate (611) is disposed on the cavity wall of the cavity. The push rod (612) and the snap-fit ​​rod (613) are slidably passed through the cavity wall of the cavity at the ends away from the connecting plate (611). The length of the snap-fit ​​rod (613) is less than the length of the push rod (612). The snap-fit ​​rod (613) abuts against the bottom wall of the top plate (22). The push rod (612) is located above the top plate (22).

7. The prefabricated steel trestle structure according to claim 6, characterized in that: The clamping assembly (62) includes a pair of clamping racks (621) slidably disposed on the side plate (23), the clamping racks (621) are provided with clamping rods (622), the clamping racks (621) are connected to the drive assembly (63), and the clamping rods (622) abut against the railing (31).

8. The prefabricated steel trestle structure according to claim 7, characterized in that: The drive assembly (63) includes a rotating column (631), a gear (632), a drive rack (633), a drive plate (634), a support plate (635), and a plurality of return springs (636) connected between the support plate (635) and the drive plate (634). The rotating column (631) is rotatably connected to the side plate (23). The gear (632) is disposed on the rotating column (631) and is located between a pair of clamping racks (621), and the clamping racks (621) are all meshed with the gear (632). The drive rack (633) is slidably disposed on the side plate (23) and meshes with the gear (632). The drive plate (634) is connected to the drive rack (633), and the support plate (635) is disposed on the side plate (23).

9. A construction method for an assembled steel trestle bridge structure as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Level the site, measure and lay out the actual position of the steel pipe pile foundation (1) according to the design drawings, and direct the positioning boat to position it; S2. Construct the bridge abutment; S3. Use a crane to lift the steel pipe piles of the steel pipe pile foundation (1) and place them in the determined position. Use a pile hammer to drive the steel pipe piles into the designated position, and complete the piling of the steel pipe piles of the steel pipe pile foundation (1) one by one. Cut grooves on the top of the steel pipe piles; S4. Use a crane to lift the connecting mechanism (4) onto the steel pipe pile foundation (1), place the connecting frame (42) in the groove, and weld the connecting frame (42) to the steel pipe pile; S5. Use a crane to lift a precast bridge deck layer (2) onto the bridge abutment and connecting frame (42), and fix the precast bridge deck layer (2) onto the connecting plate (41) with several U-bolts (43); S6. Use a crane to lift another precast bridge deck layer (2) onto a pair of connecting plates. On the frame (42), the pull rope (525) is wound around the second fixed column (522), the auxiliary rotating tool (7) is fitted onto the rotating shaft (51), so that the locking block (8) on the rotating shaft (51) is engaged with the auxiliary rotating tool (7), the sling is fitted onto the auxiliary rotating tool (7), and the rotating shaft (51) is rotated by pulling the sling with a winch until the precast bridge deck layer (2) is aligned with the installed precast bridge deck layer (2). S7. Press firmly, then remove the auxiliary rotating tool (7); S8. Repeat S6 until the precast bridge deck layer (2) overlaps onto another bridge abutment, and fix the precast bridge deck layer (2) onto the bridge abutment; S9. Stretch the precast guardrail (3) so that each railing (31) is aligned with the insertion hole. The staff press the push rod (612) and insert the railing (31) into the insertion hole at the same time. Release the push rod (612) to complete the installation of the precast guardrail (3).

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