Prefabricated steel trestle deck panel structural system for bailey truss and construction process therefor

Abstract

The present invention relates to the technical field of steel trestles. Disclosed are a prefabricated steel trestle deck panel structural system for a bailey truss and a construction process therefor. The present invention comprises trestle deck panel bodies; mounting portions are arranged at intervals on the side edges of each trestle deck panel body; a longitudinal connecting hole is provided in a side edge of each mounting portion, and a longitudinal connecting bolt is mounted in the longitudinal connecting hole; and two adjacent trestle deck panel bodies along the length direction of a steel trestle deck are jointly fixed by the longitudinal connecting bolts passing through the longitudinal connecting holes. The trestle deck panel body of the present invention is prefabricated by welded assembly of multiple patterned H-shaped steels, so that an integrated plate-girder structure is realized, and the strength, friction resistance and load-bearing capacity of the trestle deck panel body can meet and surpass the usage performance of traditional steel trestle deck panels. In addition, during laying the steel trestle deck panels, the steel trestle deck panels only need to be fixed by means of limiting devices having bolts, without the need for on-site welding. Thus, the panels are recyclable, reusable, and allow for targeted replacement for certain panels, thereby effectively saving costs, achieving resource recycling, and offering high practical value.

Description

A prefabricated steel trestle structure system for Bailey bridges and its construction technology Technical Field

[0001] This invention relates to the field of steel trestle technology, and more specifically, to a prefabricated steel trestle structure system for Bailey bridges and its construction process. Background Technology

[0002] During the construction of steel trestle bridges, the steel trestle bridges are important temporary works and play a crucial role in the entire construction process. The connections between all the steel trestle bridge structures are extremely important.

[0003] The existing steel trestle bridge is usually laid by using ordinary steel plates along the length of the bridge deck and fixing them with bolts on both sides. After the laying is completed, the steel plates of the trestle bridge are only constrained in the length direction, while the adjacent trestle plates are not properly constrained. Therefore, when subjected to the torque generated by large vehicles, especially when large vehicles turn, the steel plates are prone to deflection under stress, which can lead to large gaps between adjacent trestle plates and create certain safety hazards.

[0004] During the installation of steel trestle bridge systems, as shown in Chinese patent CN202122253864.2 - Bailey bridge steel trestle bridge applied to deep foundation pit construction, the existing construction methods have the following drawbacks: First, multiple I-beam crossbeams are fixedly welded to the top of the Bailey bridge; second, bridge deck steel plates are fixedly welded to the top of the I-beam crossbeams. This construction method requires the I-beam crossbeams and bridge deck steel plates to be laid in stages, and all of them are welded on-site. The construction cost is high, the construction time is long, and the quality of on-site construction is inconsistent. When dismantling, the deformation caused by flame cutting is large, and the material loss is large.

[0005] Secondly, the steel trestle bridge is connected to the Bailey bridge on both sides with bolts. Over time, the vibrations from construction vehicles can cause the bolts to loosen and fall off. Furthermore, the steel trestle bridge and the Bailey bridge require both to align their connection nodes to achieve a bolted connection. If the connection nodes between the steel trestle bridge's I-beams and the Bailey bridge are misaligned, effective fixation is not possible. Technical issues

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a prefabricated steel trestle structure system for Bailey bridges and its construction process. The steel trestle of this invention is prefabricated and welded from multiple sets of patterned H-beams. Its strength, friction, and load-bearing capacity can meet and exceed the performance of existing steel trestles, realizing the integration of the trestle and beam, greatly simplifying the installation process. Furthermore, during the laying of the steel trestle, it only needs to be fixed with U-bolt clamps, eliminating the need for on-site welding. It is recyclable, reusable, and can be replaced locally, effectively saving costs and realizing resource recycling, thus possessing extremely high use value. Technical solutions

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0008] The present invention discloses a prefabricated steel trestle structure system for Bailey bridges, comprising a trestle body, wherein mounting portions are provided at intervals on the side of the trestle body, and longitudinal connecting holes are provided on the side of the mounting portions. Longitudinal connecting bolts are installed in the longitudinal connecting holes. Two adjacent trestle bodies along the length of the steel trestle bridge deck are fixed together by the longitudinal connecting bolts passing through the longitudinal connecting holes.

[0009] Furthermore, the trestle plate body is made by laying multiple sets of patterned H-beams flat and then welding them together.

[0010] Furthermore, railing connection parts are provided at the four corners of the trestle board body. Railing connection holes are opened on the side of the railing connection parts. Railing fixing bolts are installed in the railing connection holes. The railings are placed on the side of the trestle board body and assembled with the railing connection holes of the trestle board body through the railing fixing bolts.

[0011] Furthermore, the interior of the mounting part is configured as a cavity structure, and a lifting hole is provided at the top of the inner cavity of the mounting part.

[0012] Furthermore, the upper and lower parts of the inner cavity of the mounting part are both fixedly welded with hoisting reinforcing ribs.

[0013] Furthermore, a positioning plate is provided in the middle of the inner cavity of the mounting part, mounting holes are provided at intervals at the bottom of the inner cavity of the mounting part, and mounting holes are also provided on the surface of the positioning plate.

[0014] Furthermore, a Bailey bridge frame is provided at the bottom of the trestle plate body, and a limiting device is provided at the connection between the trestle plate body and the Bailey bridge frame. The lower end of the limiting device passes through the Bailey bridge frame, and the upper end of the limiting device is sequentially installed with a mounting part and a positioning plate, and is fixed to the positioning plate by mounting bolts.

[0015] Furthermore, a Bailey bridge frame is provided at the bottom of the trestle plate body, and an installation auxiliary component is provided at the connection between the trestle plate body and the Bailey bridge frame. The longitudinal section of the installation auxiliary component is U-shaped, the upper end of the installation auxiliary component is welded to the trestle plate body, and the lower end of the installation auxiliary component is fixed relative to the upper beam of the Bailey bridge frame.

[0016] Furthermore, the installation auxiliary component can be a U-shaped hook or an L-shaped hook.

[0017] A construction process for a prefabricated steel trestle structure system for Bailey bridges, comprising the following steps:

[0018] Step 1: Measurement and layout;

[0019] The coordinates of each steel pipe pile were calculated based on the construction layout plan. The calculation results were submitted to the chief engineer of the project for review. After confirmation, field surveying was carried out. The steel pipe piles were initially positioned using GPS and monitored throughout the process using a total station. During the pile driving process, two total stations were used at a 90-degree angle to monitor the deviation of the steel pipe piles to ensure the quality of the pile position.

[0020] Step Two: Steel Pipe Pile Construction;

[0021] (2-1) Transportation and splicing of steel pipe piles

[0022] Before leaving the factory, the steel pipe piles of the steel platform are treated with anti-corrosion. After the pipe piles are fabricated in a professional steel structure processing plant, they are transported to the construction site by transport vehicle. Due to the long size, heavy weight and easy rolling of the steel pipe piles, steel pipe piles must be tied and reinforced with steel wire ropes to ensure transportation safety. After the steel pipe piles are transported to the site and pass the acceptance, they are spliced ​​into a whole according to the design length. In order to ensure the welding quality, the welding quality meets the requirements of the second-level weld.

[0023] (2-2) Installation of guide frame

[0024] Using a total station, the control points of the traverse network are accurately laid out to locate the center point of the pile. A guide frame is installed, and a crane is used to lift the assembled steel pipe pile and place it into the guide frame.

[0025] (2-3) Alignment and stake insertion

[0026] The system uses hydraulic clamps, which quickly clamp and release steel pipes by oil inlet and outlet of hydraulic cylinders. The clamps hold the steel pipe piles, while a crawler crane suspends the top of the steel pipe piles with a spare wire rope.

[0027] (2-4) Vibration and sinking

[0028] The crawler crane directly lifts the steel pipe pile using a vibratory hammer and a spare wire rope. Guided by measurements, the steel pipe pile is adjusted to the marked position and then quickly lowered. Once the pile stabilizes in the soil under its own weight, the vibratory hammer is activated to further drive it down. The duration of each vibration must be precisely controlled; too long a duration will damage the hammer, while too short a duration will hinder sinking. Each pile should be driven down in one continuous motion, without interruption or prolonged gaps, to prevent soil regeneration around the pile and subsequent sinking difficulties. During the vibratory sinking process, measuring instruments continuously monitor the verticality.

[0029] (2-5) Shi Zhen is in place

[0030] After the pile splicing is completed, the hydraulic hammer is hoisted to clamp the pile, and vibration is continued to drive the steel pipe pile to the design elevation of the pile bottom;

[0031] Step 3: Installation of the substructure of the steel trestle bridge

[0032] (3-1) Leveling of steel pipes

[0033] After the steel pipe piles are driven, the measurement points and leveling are carried out according to the design elevation.

[0034] (3-2) Construction of horizontal and diagonal bracing

[0035] After the single row of steel pipe piles is driven into place, the horizontal bracing and diagonal bracing are connected. The horizontal bracing and diagonal bracing are made of 20 channel steel shear bracing. The connection between the steel pipe piles and the horizontal bracing is made by welding.

[0036] (3-3) Construction of load-bearing beams

[0037] The steel platform load-bearing beam is constructed using H400×400×13×21. The beam is placed inside the grooves cut into the top of the steel pipe piles and stiffening plates welded at the pile openings. The double-section steel I-beams are processed in the back-end and installed on-site. First, the axis and position of the load-bearing beam are marked on the steel pipe piles. Then, grooves are cut into the top of the steel pipe piles and stiffening plates are welded inside the pile openings. The beams are then lifted, installed, and welded together.

[0038] Step 4: Installation of the superstructure of the steel trestle bridge

[0039] (4-1) Bailey bridge installation

[0040] After the load-bearing beam is installed, the position of the Bailey bridge is measured and laid out on the load-bearing beam. The Bailey bridge is assembled into a group in the back field according to the design span, transported to the front field and installed in place by crane. Each group of Bailey bridges is connected to the support frame welded with steel sections to form a whole. The group is connected by a fixed flower rack to ensure the overall stability. The Bailey bridge is connected to the load-bearing beam through a limiting device.

[0041] (4-2) Bridge deck system installation

[0042] After the Bailey bridge frame is installed, the trestle panels are laid and fixed to the Bailey bridge frame using limiting devices; two adjacent trestle panels along the length of the steel trestle bridge deck are fixed together using longitudinal connecting bolts.

[0043] (4-3) Railing installation

[0044] Place the railings on the side of the trestle panel and assemble them with the trestle panel body using railing fixing bolts. Beneficial effects

[0045] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0046] (1) The steel trestle of the present invention is prefabricated and welded by splicing multiple sets of patterned H-beams. Its strength, friction and bearing capacity can meet the requirements of the use of steel trestle. In addition, during the laying process of steel trestle, it only needs to be fixed by bolts. No on-site welding is required. It can be recycled, reused, and can be replaced locally. It effectively saves costs, realizes resource recycling, and has extremely high use value.

[0047] (2) By designing the railing connection hole as a side opening, the railing can be installed on the side of the trestle board body, thus not occupying the upper part of the trestle board body, and reserving more bridge surface operation space for the trestle board body without losing safety protection.

[0048] (3) The installation part of the present invention can be used as a connection node between two adjacent bridge panels, as a hoisting node for the bridge panel body, and as a fixing node between the bridge panel body and the Bailey bridge frame, thereby achieving multi-functionality.

[0049] (4) The present invention can be assembled by laying multiple sets of bridge deck bodies to form a corresponding bridge deck structure system; the connection between the bridge deck body and the Bailey frame is provided with installation auxiliary parts or limiting devices, so as to achieve relative fixation between the bridge deck body and the Bailey frame, and avoid the bridge deck body from shaking. The installation auxiliary parts, together with the limiting devices and installation bolts, can effectively prevent the installation bolts from loosening or falling off, and improve safety and stability. Attached Figure Description

[0050] Figure 1 is a front view of the trestle plate body of the present invention;

[0051] Figure 2 is a partial enlarged view of the mounting part of the present invention;

[0052] Figure 3 is a side view of the trestle plate body of the present invention;

[0053] Figure 4 is a top view of the trestle plate body of the present invention;

[0054] Figure 5 is a diagram showing the splicing effect of the trestle plate body of the present invention;

[0055] Figure 6 is an enlarged view of the connection effect of the mounting part of the present invention;

[0056] Figure 7 is a diagram showing the installation effect of the railing according to the present invention;

[0057] Figure 8 is an enlarged view of the partial installation effect of the railing of the present invention.

[0058] Figure 9 is a diagram showing the fixed state of the trestle plate body of the present invention;

[0059] Figure 10 is a schematic diagram of the installation auxiliary component of the present invention;

[0060] Figure 11 is a schematic diagram of the installation of the steel pipe pile of the present invention;

[0061] Figure 12 is a diagram of the Bailey bridge installation according to the present invention.

[0062] In the diagram: 1. Trestle board body; 11. Mounting part; 111. Longitudinal connecting hole; 112. Longitudinal connecting bolt; 113. Lifting hole; 114. Lifting reinforcing rib; 115. Positioning plate; 116. Mounting hole; 12. Guardrail connecting part; 121. Guardrail connecting hole; 122. Guardrail fixing bolt; 2. Bailey bridge; 3. Limiting device; 31. Mounting bolt; 4. Installation auxiliary parts; 5. Guardrail. Embodiments of the present invention

[0063] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0064] As can be seen from Figures 1-6, a prefabricated steel trestle for Bailey bridges in this embodiment includes a trestle body 1. The sides of the trestle body 1 are provided with mounting parts 11 at intervals. The sides of the mounting parts 11 are provided with longitudinal connecting holes 111. Longitudinal connecting bolts 112 are installed in the longitudinal connecting holes 111. Two adjacent trestle body 1s along the length of the steel trestle bridge deck are fixed together by the longitudinal connecting bolts 112 passing through the longitudinal connecting holes 111.

[0065] The main body of the trestle deck 1 is made by laying multiple sets of patterned H-beams flat and then welding them together.

[0066] The steel trestle of this invention is prefabricated and welded from multiple sets of patterned H-beams. Its strength, friction, and load-bearing capacity can all meet the requirements for use as a steel trestle. Furthermore, during the laying process, the steel trestle only needs to be fixed with bolts, eliminating the need for on-site welding. It is recyclable, reusable, and can be replaced locally, effectively saving costs and realizing resource recycling, thus possessing extremely high use value.

[0067] The main body 1 of the trestle plate, which is laid along the length of the steel trestle bridge, is fixed to the Bailey frame 2 by bolts or limiting components;

[0068] The trestle plate body 1 is laid along the length of the steel trestle bridge. Two adjacent trestle plate bodies 1 are fixed by longitudinal connecting bolts 112, which can effectively prevent the trestle plate body 1 from deflecting due to torque, and can ensure that there are no gaps between the trestle plate bodies 1, effectively eliminating safety hazards. Example

[0069] As can be seen from Figures 7-8, in this embodiment, a prefabricated steel trestle for Bailey bridges has railing connection parts 12 at the four corners of the trestle body 1. The side of the railing connection part 12 has railing connection holes 121. Railing fixing bolts 122 are installed in the railing connection holes 121. The railing 5 is placed on the side of the trestle body 1 and assembled with the railing connection holes 121 of the trestle body 1 through the railing fixing bolts 122.

[0070] By designing the railing connection hole 121 as a side opening, the railing 5 can be installed on the side of the trestle body 1, thus not occupying the upper usable area of ​​the trestle body 1, and reserving more bridge surface operation space for the trestle body 1 without losing safety protection.

[0071] The width direction of the trestle plate body 1 is the same as the length direction of the steel trestle, and the length direction of the trestle plate body 1 is the same as the width direction of the steel trestle. The trestle plate body 1 is a prefabricated component. Usually, the length of one trestle plate body 1 is equal to the width of the steel trestle. When the length of one trestle plate body 1 cannot meet the width requirement of the steel trestle, the trestle plate bodies 1 can be laid sequentially along the width direction of the steel trestle. At this time, the railing connection hole 121 can be used as the connection hole of the trestle plate body 1.

[0072] The interior of the mounting part 11 is a hollow structure, and a lifting hole 113 is provided at the top of the inner cavity of the mounting part 11.

[0073] The upper and lower parts of the inner cavity of the mounting part 11 are fixedly welded with hoisting reinforcing ribs 114.

[0074] A positioning plate 115 is provided in the middle of the inner cavity of the mounting part 11, and mounting holes 116 are provided at intervals at the bottom of the inner cavity of the mounting part 11. Mounting holes 116 are also provided on the surface of the positioning plate 115.

[0075] The mounting section 11 can serve as a connection node between two adjacent bridge deck bodies 1, a hoisting node for the bridge deck body 1, and a fixing node between the bridge deck body 1 and the Bailey bridge 2, thus achieving multi-functionality. Example

[0076] As can be seen from Figures 7-10, in this embodiment, a prefabricated steel trestle bridge system for Bailey bridges is provided at the bottom of the trestle bridge body 1. By laying multiple sets of trestle bridge body 1, the corresponding bridge deck structure system can be assembled.

[0077] As can be seen from Figures 7-8, when the mounting part 11 of the trestle plate body 1 and the upper beam of the Bailey bridge 2 are on the same horizontal line, a limiting device 3 is provided at the connection between the trestle plate body 1 and the Bailey bridge 2. The lower end of the limiting device 3 passes through the Bailey bridge 2, and the upper end of the limiting device 3 is sequentially mounted with the mounting part 11 and the positioning plate 115, and is fixed to the positioning plate 115 by mounting bolts 31.

[0078] As can be seen from Figures 9-10, the bottom of the trestle plate body 1 is supported by the Bailey bridge 2. When there is no corresponding installation part 11 at the connection node between the upper beam of the Bailey bridge 2 and the trestle plate body 1, an installation auxiliary part 4 is provided at the connection between the trestle plate body 1 and the Bailey bridge 2. The longitudinal section of the installation auxiliary part 4 is U-shaped. The upper end of the installation auxiliary part 4 is welded to the trestle plate body 1, and the lower end of the installation auxiliary part 4 is fixed relative to the upper beam of the Bailey bridge 2.

[0079] The installation auxiliary component 4 can be a U-shaped hook or an L-shaped hook, which can achieve relative fixation between the bridge plate body 1 and the Bailey frame 2, and prevent the bridge plate body 1 from shaking. At the same time, it can be used in conjunction with the limiting device 3 and the mounting bolts 31 to effectively prevent the mounting bolts 31 from loosening or falling off, thereby improving safety and stability. Example

[0080] As shown in Figures 11-12, the construction process of a prefabricated steel trestle structure system for Bailey bridges involves the following steps:

[0081] Step 1: Measurement and layout;

[0082] The coordinates of each steel pipe pile were calculated based on the construction layout plan. The calculation results were submitted to the chief engineer of the project for review. After confirmation, field surveying was carried out. The steel pipe piles were initially positioned using GPS and monitored throughout the process using a total station. During the pile driving process, two total stations were used at a 90-degree angle to monitor the deviation of the steel pipe piles to ensure the quality of the pile position.

[0083] Step Two: Steel Pipe Pile Construction;

[0084] (2-1) Transportation and splicing of steel pipe piles

[0085] Before leaving the factory, the steel pipe piles of the steel platform are treated with anti-corrosion. After the pipe piles are fabricated in a professional steel structure processing plant, they are transported to the construction site by transport vehicle. Due to the long size, heavy weight and easy rolling of the steel pipe piles, steel pipe piles must be tied and reinforced with steel wire ropes to ensure transportation safety. After the steel pipe piles are transported to the site and pass the acceptance, they are spliced ​​into a whole according to the design length. In order to ensure the welding quality, the welding quality meets the requirements of the second-level weld.

[0086] (2-2) Installation of guide frame

[0087] Using a total station, the control points of the traverse network are accurately laid out to locate the center point of the pile. A guide frame is installed, and a crane is used to lift the assembled steel pipe pile and place it into the guide frame.

[0088] (2-3) Alignment and stake insertion

[0089] The system uses hydraulic clamps, which quickly clamp and release steel pipes by oil inlet and outlet of hydraulic cylinders. The clamps hold the steel pipe piles, while a crawler crane suspends the top of the steel pipe piles with a spare wire rope.

[0090] (2-4) Vibration and sinking

[0091] The crawler crane directly lifts the steel pipe pile using a vibratory hammer and a spare wire rope. Guided by measurements, the steel pipe pile is adjusted to the marked position and then quickly lowered. Once the pile stabilizes in the soil under its own weight, the vibratory hammer is activated to further drive it down. The duration of each vibration must be precisely controlled; too long a duration will damage the hammer, while too short a duration will hinder sinking. Each pile should be driven down in one continuous motion, without interruption or prolonged gaps, to prevent soil regeneration around the pile and subsequent sinking difficulties. During the vibratory sinking process, measuring instruments continuously monitor the verticality.

[0092] (2-5) Shi Zhen is in place

[0093] After the pile splicing is completed, the hydraulic hammer is hoisted to clamp the pile, and vibration is continued to drive the steel pipe pile to the design elevation of the pile bottom;

[0094] Step 3: Installation of the substructure of the steel trestle bridge

[0095] (3-1) Leveling of steel pipes

[0096] After the steel pipe piles are driven, the measurement points and leveling are carried out according to the design elevation.

[0097] (3-2) Construction of horizontal and diagonal bracing

[0098] After the single row of steel pipe piles is driven into place, the horizontal bracing and diagonal bracing are connected. The horizontal bracing and diagonal bracing are made of 20 channel steel shear bracing. The connection between the steel pipe piles and the horizontal bracing is made by welding.

[0099] (3-3) Construction of load-bearing beams

[0100] The steel platform load-bearing beam is constructed using H400×400×13×21. The beam is placed inside the grooves cut into the top of the steel pipe piles and stiffening plates welded at the pile openings. The double-section steel I-beams are processed in the back-end and installed on-site. First, the axis and position of the load-bearing beam are marked on the steel pipe piles. Then, grooves are cut into the top of the steel pipe piles and stiffening plates are welded inside the pile openings. The beams are then lifted, installed, and welded together.

[0101] Step 4: Installation of the superstructure of the steel trestle bridge

[0102] (4-1) Installation of Bailey Frame 2

[0103] After the load-bearing beam is installed, the position of Bailey Frame 2 is measured and laid out on the load-bearing beam. Bailey Frame 2 is assembled into a group in the back field according to the design span, transported to the front field and installed in place by crane. Each group of Bailey Frame 2 is connected to the support frame welded by steel profiles to form a whole. The group is connected by a fixed flower rack to ensure the overall stability. Bailey Frame 2 is connected to the load-bearing beam through a limiting device.

[0104] (4-2) Bridge deck system installation

[0105] After the Bailey bridge 2 is installed, the trestle plate body 1 is laid. The trestle plate body 1 and the Bailey bridge 2 are fixed together by the limiting device 3. Two adjacent trestle plate bodies 1 along the length of the steel trestle bridge deck are fixed together by longitudinal connecting bolts 112.

[0106] The safety and stability of the installation of the trestle plate body 1 can also be improved by using the auxiliary component 4 in conjunction with the limiting device 3.

[0107] (4-3) Installation of railing 5

[0108] Place the railing 5 on the side of the trestle plate body 1 and assemble it with the trestle plate body 1 using the railing fixing bolts 122.

[0109] As can be seen from the above construction process, this invention simplifies the construction process of the Bailey bridge superstructure. The prefabricated trestle panel body 1 is recyclable, realizing resource recycling and possessing extremely high use value. The trestle panel body 1 is a single-layer structure, replacing the traditional three-layer structure combining transverse distribution beams, longitudinal distribution beams, and bridge deck, significantly simplifying the construction process, shortening the construction cycle, and saving construction costs. At the same time, the quality of the prefabricated trestle panel body 1 is controllable, eliminating the need for frequent welding work during on-site construction, effectively solving the construction quality problem from the root.

[0110] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A prefabricated steel trestle structure system for Bailey bridges, comprising a trestle body (1), characterized in that: The side of the trestle plate body (1) is provided with an installation part (11) at intervals. The side of the installation part (11) is provided with a longitudinal connection hole (111). A longitudinal connection bolt (112) is installed in the longitudinal connection hole (111). Two adjacent trestle plate bodies (1) along the length direction of the steel trestle bridge deck are fixed together by the longitudinal connection bolt (112) passing through the longitudinal connection hole (111).

2. The prefabricated steel trestle structure system for Bailey bridges according to claim 1, characterized in that: The trestle plate body (1) is made by laying multiple sets of patterned H-beams and welding them together.

3. The prefabricated steel trestle structure system for Bailey bridges according to claim 1, characterized in that: The four corners of the trestle board body (1) are provided with railing connection parts (12). The side of the railing connection part (12) is provided with railing connection holes (121). Railing fixing bolts (122) are installed in the railing connection holes (121). The railing (5) is placed on the side of the trestle board body (1) and is assembled with the railing connection holes (121) of the trestle board body (1) through the railing fixing bolts (122).

4. The prefabricated steel trestle structure system for Bailey bridges according to claim 3, characterized in that: The interior of the mounting part (11) is configured as a cavity structure, and a lifting hole (113) is provided at the top of the inner cavity of the mounting part (11).

5. The prefabricated steel trestle structure system for Bailey bridges according to claim 4, characterized in that: The upper and lower parts of the inner cavity of the mounting part (11) are fixedly welded with hoisting reinforcing ribs (114).

6. The prefabricated steel trestle structure system for Bailey bridges according to claim 4, characterized in that: The mounting part (11) has a positioning plate (115) in the middle of its inner cavity, and mounting holes (116) are provided at intervals at the bottom of the inner cavity of the mounting part (11). Mounting holes (116) are also provided on the surface of the positioning plate (115).

7. The prefabricated steel trestle structure system for Bailey bridges according to claim 6, characterized in that: The bottom of the bridge deck body (1) is provided with a Bailey frame (2). A limiting device (3) is provided at the connection between the bridge deck body (1) and the Bailey frame (2). The lower end of the limiting device (3) passes through the Bailey frame (2). The upper end of the limiting device (3) is sequentially installed with a part (11) and a positioning plate (115), and is fixed to the positioning plate (115) by mounting bolts (31).

8. The prefabricated steel trestle structure system for Bailey bridges according to claim 1, characterized in that: The bottom of the trestle plate body (1) is provided with a Bailey bridge frame (2), and an installation auxiliary component (4) is provided at the connection between the trestle plate body (1) and the Bailey bridge frame (2). The longitudinal section of the installation auxiliary component (4) is U-shaped. The upper end of the installation auxiliary component (4) is welded to the trestle plate body (1), and the lower end of the installation auxiliary component (4) is fixed relative to the upper beam of the Bailey bridge frame (2).

9. The prefabricated steel trestle structure system for Bailey bridges according to claim 8, characterized in that: The installation auxiliary component (4) can be a U-shaped hook or an L-shaped hook.

10. The construction process of a prefabricated steel trestle structure system for Bailey bridges according to claim 9, characterized in that: The steps are as follows: Step 1: Measurement and layout; The coordinates of each steel pipe pile were calculated based on the construction layout plan. The calculation results were submitted to the chief engineer of the project for review. After confirmation, field surveying was carried out. The steel pipe piles were initially positioned using GPS and monitored throughout the process using a total station. During the pile driving process, two total stations were used at a 90-degree angle to monitor the deviation of the steel pipe piles to ensure the quality of the pile position. Step Two: Steel Pipe Pile Construction; (2-1) Transportation and splicing of steel pipe piles Before leaving the factory, the steel pipe piles of the steel platform are treated with anti-corrosion. After the pipe piles are fabricated in a professional steel structure processing plant, they are transported to the construction site by transport vehicle. Due to the long size, heavy weight and easy rolling of the steel pipe piles, steel pipe piles must be tied and reinforced with steel wire ropes to ensure transportation safety. After the steel pipe piles are transported to the site and pass the acceptance, they are spliced ​​into a whole according to the design length. In order to ensure the welding quality, the welding quality meets the requirements of the second-level weld. (2-2) Installation of guide frame Using a total station, the control points of the traverse network are accurately laid out to locate the center point of the pile. A guide frame is installed, and a crane is used to lift the assembled steel pipe pile and place it into the guide frame. (2-3) Alignment and stake insertion The system uses hydraulic clamps, which quickly clamp and release steel pipes by oil inlet and outlet of hydraulic cylinders. The clamps hold the steel pipe piles, while a crawler crane suspends the top of the steel pipe piles with a spare wire rope. (2-4) Vibration and sinking The crawler crane directly lifts the steel pipe pile using a vibratory hammer and a spare wire rope. Guided by measurements, the steel pipe pile is adjusted to the marked position and then quickly lowered. Once the pile stabilizes in the soil under its own weight, the vibratory hammer is activated to further drive it down. The duration of each vibration must be precisely controlled; too long a duration will damage the hammer, while too short a duration will hinder sinking. Each pile should be driven down in one continuous motion, without interruption or prolonged gaps, to prevent soil regeneration around the pile and subsequent sinking difficulties. During the vibratory sinking process, measuring instruments continuously monitor the verticality. (2-5) Shi Zhen is in place After the pile splicing is completed, the hydraulic hammer is hoisted to clamp the pile, and vibration is continued to drive the steel pipe pile to the design elevation of the pile bottom; Step 3: Installation of the substructure of the steel trestle bridge (3-1) Leveling of steel pipes After the steel pipe piles are driven, the measurement points and leveling are carried out according to the design elevation. (3-2) Construction of horizontal and diagonal bracing After the single row of steel pipe piles is driven into place, the horizontal bracing and diagonal bracing are connected. The horizontal bracing and diagonal bracing are made of 20 channel steel shear bracing. The connection between the steel pipe piles and the horizontal bracing is made by welding. (3-3) Construction of load-bearing beams The steel platform load-bearing beam is constructed using H400×400×13×21. The beam is placed inside the grooves cut into the top of the steel pipe piles and stiffening plates welded at the pile openings. The double-section steel I-beams are processed in the back-end and installed on-site. First, the axis and position of the load-bearing beam are marked on the steel pipe piles. Then, grooves are cut into the top of the steel pipe piles and stiffening plates are welded inside the pile openings. The beams are then lifted, installed, and welded together. Step 4: Installation of the superstructure of the steel trestle bridge (4-1) Bailey frame (2) Installation After the load-bearing beam is installed, the position of the Bailey frame (2) is measured and laid out on the load-bearing beam. The Bailey frame (2) is assembled into a group in the back field according to the design span, transported to the front field and installed in place by crane. Each group of Bailey frames (2) is connected into a whole by a support frame welded with steel profiles. The group is connected by a fixed flower frame to ensure the overall stability. The Bailey frame (2) is connected to the load-bearing beam through a limiting device. (4-2) Bridge deck system installation After the Bailey bridge frame (2) is installed, the trestle plate body (1) is laid. The trestle plate body (1) and the Bailey bridge frame (2) are fixed by the limiting device (3). Two adjacent trestle plate bodies (1) along the length of the steel trestle bridge deck are fixed together by longitudinal connecting bolts (112). (4-3) Railing (5) Installation Place the railing (5) on the side of the trestle board body (1) and assemble it with the trestle board body (1) by using railing fixing bolts (122).

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