Recyclable steel trestle foundation pit ramp and construction method thereof

Abstract

The application discloses a recyclable steel trestle foundation pit ramp and a construction method thereof, which comprises steel columns, bearing beams, Bailey frames, distribution beams and bridge steel plates, wherein the steel columns are arranged from high to low along the foundation pit gradient, the bearing beams are arranged on two steel columns arranged in the same row, the Bailey frames are arranged on the bearing beams, the distribution beams are fixed on the Bailey frames through fixing members, the bridge steel plates are arranged on the distribution beams, and movable supports are arranged at bridge abutment contact positions to guarantee the buffering and damping effects, and the lower bridge abutment is provided with a top steel plate which is arranged in contact with a clay layer to reduce rigid collision and relieve vehicle jumping.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a recyclable steel trestle bridge foundation pit ramp and its construction method. Background Technology

[0002] Bridge construction refers to the process of building a bridge according to the design. It mainly includes bridge construction technology, construction organization, construction management, and construction quality. In engineering projects such as buildings, bridges, aviation, and pipelines, a type of beam with three or more supports is often encountered, which is called a continuous beam.

[0003] The existing cast-in-place beams cannot be effectively and quickly disassembled and moved after the Bailey beam construction is completed. Disassembly and movement are mostly done by personnel before subsequent erection, which makes subsequent construction inefficient.

[0004] Therefore, it is necessary to provide a recyclable steel trestle foundation pit ramp and its construction method to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a recyclable steel trestle bridge foundation pit ramp and its construction method, in order to solve the problem mentioned in the background art that when existing cast-in-place beams are erected, the entire structure cannot be effectively and quickly disassembled and moved after the Bailey beam construction is completed, and disassembly and movement are mostly carried out by personnel before subsequent erection, which makes subsequent construction inefficient.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a recyclable steel trestle bridge pit ramp, comprising steel columns, load-bearing beams, Bailey bridges, distribution beams and bridge deck steel plates, wherein steel columns are arranged along the slope of the pit from high to low, load-bearing beams are installed on two steel columns in the same row, Bailey bridges are installed on the load-bearing beams, the Bailey bridges are fixed to the distribution beams by fasteners, and bridge deck steel plates are installed on the distribution beams;

[0007] At least two rows of steel columns are longitudinally braced, with the longitudinal bracing consisting of double-channel steel scissor braces. The steel columns are provided with mounting slots, the width of which is the same as the width of the load-bearing beam. Mounting side plates are provided on both sides of the mounting slots. The load-bearing beams are inclined at both ends and mounted on the steel columns, with the bottom surface of the load-bearing beam and the bottom of the mounting slot both inclined and matching the inclination angle, consistent with the inclination angle of the bridge deck steel plate. Upper and lower bridge abutments are respectively provided at the top and bottom of the foundation pit, both being concrete structures. A first inclined steel section is pre-embedded on the upper bridge abutment. The bridge deck consists of a first inclined steel plate and an upper Bailey bridge frame connected by sliding supports. The other end of the upper Bailey bridge frame is fixedly connected to the load-bearing beam. Multiple intermediate Bailey bridge frames are sequentially arranged on the upper part of the load-bearing beam. One end of the lower Bailey bridge frame is fixedly connected to the load-bearing beam, and the other end is fixedly connected to a second pre-embedded steel plate set on the lower bridge abutment. The lower bridge abutment is also provided with a top steel plate. The top steel plate has the same inclination angle as the bridge deck steel plate, and the top steel plate is fixed to the top surface of the lower bridge abutment by studs. A fill slope is provided on one side of the lower bridge abutment, and one end of the top steel plate is set on the Bailey bridge frame, and the other end extends to the bottom slope.

[0008] The sliding support is provided with a sliding plate, a limiting groove, a limiting rubber, and a limiting post. The upper Bailey frame is placed on the sliding plate, and a limiting groove is provided in the sliding plate. The limiting post is fixed to the upper Bailey frame, inserted into the limiting groove and wrapped by the limiting rubber. When the upper Bailey frame is subjected to lateral force, it drives the limiting post to move in the limiting groove, wherein the limiting rubber plays a buffering role.

[0009] Transverse distribution beams are installed on the upper, middle and lower Bailey bridges, and bridge deck steel plates are installed on the transverse distribution beams.

[0010] The load-bearing beam is welded with connecting plates and ribs. The connecting plates connect the load-bearing beam and the mounting side plate of the steel pipe column, and the ribs connect the lower part of the load-bearing beam and the side of the steel pipe column.

[0011] The upper, middle and lower Bailey bridges are fixed to the transverse distribution beam by U-shaped fasteners, the two legs of which are threaded; the transverse distribution beam is an I-shaped steel, wherein the two legs of the U-shaped fasteners extend into the lower flange of the I-shaped steel and are tightened by nuts.

[0012] The method of filling the earth slope is as follows: a concrete cushion layer is used at the bottom and connected to the bottom slab of the foundation pit. A gravel layer is set on the cushion layer, a medium sand particle layer is filled on the gravel layer and compacted. After compaction, a rubber particle layer is laid on the medium sand particle layer, and a clay layer is set on the top of the rubber particle layer. The clay layer is in contact with the top steel plate.

[0013] The bridge deck steel plate is equipped with a sidewalk and guardrails, and the guardrails are formed by inserting steel pipes into the pre-set holes in the bridge deck steel plate.

[0014] At least two rows of steel columns form a steel column support assembly, which is connected by longitudinal horizontal bracing. The longitudinal horizontal bracing is set as a scissor brace of double channel steel, and the scissor brace is set along the height direction of the steel column.

[0015] A construction method for a recyclable steel trestle bridge foundation pit ramp is also provided, specifically as follows:

[0016] Step (1): Preparation work, first carry out pile foundation positioning and slope design, level the bottom, pour concrete at the bottom of the foundation pit, and then construct steel columns in sequence; steel pipe piles are designed to match the slope angle, arranged according to the spacing and the height of the steel columns are set.

[0017] Step (2): To ensure the stability of the steel columns, the front and rear rows of steel columns are connected in pairs and connected by scissor bracing; the top of the steel column is provided with an installation slot, and the load-bearing beam is installed in the installation slot and welded to fix it in place, in accordance with the installation inclination; the load-bearing beam is reinforced by connecting plates and ribs during installation to form a stable support.

[0018] Step (3): Install the Bailey bridge from bottom to top; The Bailey bridge is set on the load-bearing beam, with the upper, middle and lower Bailey bridges installed in sequence. One bottom end of the lower Bailey bridge is fixedly connected to the second pre-embedded steel plate set on the lower bridge abutment to ensure a rigid connection. A top steel plate is set on the lower bridge abutment, with one end of the top steel plate set on the Bailey bridge and the other end extending to the bottom slope position; The upper Bailey bridge is installed on the first inclined steel plate pre-embedded on the upper bridge abutment, and the first inclined steel plate and the upper Bailey bridge are connected by sliding supports to ensure buffering and prevent the abutment from jumping.

[0019] Step (4): Install bridge deck steel plates and ancillary facilities. Install transverse distribution beams on the Bailey bridge in sequence and then install bridge deck steel plates on them. After installing the bridge deck steel plates, set up sidewalks and guardrails. Finally, backfill and harden the bottom slope.

[0020] Step (5): After the construction is completed, a test drive will be conducted. Finally, the construction of the steel trestle bridge pit ramp will be completed and accepted. After the use is over, the steel trestle bridge pit ramp will be dismantled in sequence for recycling.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] 1. The steel trestle bridge foundation pit ramp of this application is assembled using prefabricated components, which allows for fast construction and occupies a smaller area compared to traditional earthen slopes, facilitating the interlocking construction of the structure.

[0023] 2. Steel trestle bridges are easy and efficient to dismantle, which can effectively save construction time. The components can be recycled after dismantling, saving project costs.

[0024] 3. Movable supports are installed at the bridge abutment contact points to ensure buffering and shock absorption. The lower bridge abutment is equipped with a top steel plate that contacts the clay layer to reduce rigid collisions and alleviate vehicle ramps. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the steel trestle bridge foundation pit ramp structure of the present invention;

[0027] Figure 2 This is a side view of the steel trestle bridge foundation pit ramp structure of the present invention;

[0028] Figure 3 This is a cross-sectional view of the steel trestle bridge foundation pit ramp structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the upper bridge abutment structure of the present invention;

[0030] Figure 5 This is a partial schematic diagram of the upper bridge abutment A of the present invention;

[0031] Figure 6 This is a schematic diagram of the lower bridge abutment and earthen slope of the present invention;

[0032] Figure 7 This is a schematic diagram of the load-bearing beam connection of the present invention;

[0033] Figure 8 This is a schematic diagram of the connection between the load-bearing beam and the steel column of the present invention;

[0034] Figure 9 This is a schematic diagram of the distribution beam connection of the present invention.

[0035] In the diagram: 1. Steel column; 2. Load-bearing beam; 3. Bailey bridge; 31. Upper Bailey bridge; 32. Middle Bailey bridge; 33. Lower Bailey bridge; 4. Distribution beam; 5. Bridge deck steel plate; 6. Upper abutment; 61. First inclined steel plate; 62. Sliding bearing; 620. Sliding plate; 621. Limiting groove; 622. Limiting rubber; 623. Limiting column; 7. Lower abutment; 71. Second embedded steel plate; 72. Top steel plate; 73. Stud; 8. Soil slope; 80. Concrete cushion; 81. Gravel layer; 82. Medium sand layer; 83. Rubber granule layer; 84. Clay layer; 9. Distribution beam; 10. U-shaped fastener; 11. Scissor brace; 12. Installation slot; 13. Installation side plate; 14. Pedestrian walkway; 15. Guardrail. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figures 1-7 The present invention provides a technical solution: a recyclable steel trestle bridge foundation pit ramp, comprising steel columns 1, load-bearing beams 2, Bailey bridges 3, distribution beams 4, and bridge deck steel plates 5, wherein the steel columns are arranged from high to low along the foundation pit slope, load-bearing beams are installed on two steel columns in the same row, Bailey bridges are installed on the load-bearing beams, the Bailey bridges are fixed to the distribution beams by fasteners, and bridge deck steel plates are installed on the distribution beams;

[0039] At least two rows of steel columns are provided with longitudinal horizontal bracing, which is set as scissor bracing 11 of double-channel steel; the steel columns are provided with mounting slots 12, the width of which is the same as the width of the load-bearing beam, and mounting side plates 13 are provided on both sides of the mounting slots; the load-bearing beam 2 is inclined at both ends and set on the steel columns, and the bottom surface of the load-bearing beam and the bottom of the mounting slot 12 are both inclined and matched, and the inclination angle is consistent with the inclination angle of the bridge deck steel plate; an upper bridge abutment 6 and a lower bridge abutment 7 are respectively set at the top and bottom of the foundation pit, and the upper bridge abutment and the lower bridge abutment are both concrete structures. A first inclined steel plate 61 is embedded on the upper bridge abutment, and the first inclined steel plate and the upper Bailey bridge 31 are connected. The upper Bailey bridge is connected by sliding supports 62, and the other end of the upper Bailey bridge is fixedly connected to the load-bearing beam 2. Multiple intermediate Bailey bridges 32 are sequentially arranged on the upper part of the load-bearing beam. One end of the lower Bailey bridge 33 is fixedly connected to the load-bearing beam, and the other end is fixedly connected to the second pre-embedded steel plate 71 set on the lower abutment 7. The lower abutment is also provided with a top steel plate 72. The top steel plate 72 has the same inclination angle as the bridge deck steel plate 5, and the extension surface of the bridge deck steel plate is on the same plane as the top plate steel plate. The top steel plate is fixed to the top surface of the lower abutment 7 by studs 73. A fill slope 8 is provided on one side of the lower abutment, and one end of the top steel plate is set on the lower Bailey bridge 33, and the other end extends to the bottom slope 8.

[0040] The sliding support 62 is provided with a sliding plate 620, a limiting groove 621, a limiting rubber 622, and a limiting post 623. The upper Bailey frame is placed on the sliding plate 620. The limiting groove 621 is provided in the sliding plate. The limiting post 623 is fixed to the upper Bailey frame. The limiting post is inserted into the limiting groove and is wrapped by the limiting rubber 622. When the upper Bailey frame is subjected to lateral force, it drives the limiting post to move in the limiting groove 621. The limiting rubber plays a buffering role.

[0041] Transverse distribution beams 9 are installed on the upper, middle and lower Bailey bridges, and bridge deck steel plates are installed on the transverse distribution beams.

[0042] The load-bearing beam is welded with a connecting plate 21 and a rib plate 22. The connecting plate connects the load-bearing beam and the mounting side plate 13 of the steel pipe column, and the rib plate connects the lower part of the load-bearing beam and the side of the steel pipe column.

[0043] The upper, middle and lower Bailey bridges are fixed to the transverse distribution beam 9 by U-shaped fasteners 10, and the two legs of the U-shaped fasteners are threaded; the transverse distribution beam is an I-shaped steel, wherein the two legs of the U-shaped fasteners extend into the lower flange of the I-shaped steel and are tightened by nuts.

[0044] The method of filling the earth slope is as follows: a concrete cushion layer 80 is used at the bottom and connected to the bottom plate of the foundation pit. A gravel layer 81 is set on the cushion layer. A medium sand particle layer 82 is filled on the gravel layer and compacted. After compaction, a rubber particle layer 83 is laid on the medium sand particle layer. A clay layer 84 is set on the top of the rubber particle layer. The clay layer is in contact with the top steel plate.

[0045] A pedestrian walkway 14 and a guardrail 15 are provided on the steel plate of the bridge deck. The guardrail is formed by inserting steel pipes into the pre-set holes in the steel plate of the bridge deck.

[0046] At least two rows of steel columns form a steel column support assembly, which is connected by longitudinal horizontal bracing. The longitudinal horizontal bracing is set as a scissor brace of double channel steel, and the scissor brace is set along the height direction of the steel column.

[0047] A construction method for a recyclable steel trestle bridge foundation pit ramp is also provided, specifically as follows:

[0048] Step (1): Preparation work, first carry out pile foundation positioning and slope design, level the bottom, pour concrete at the bottom of the foundation pit, and then construct steel columns in sequence; steel pipe piles are designed to match the slope angle, arranged according to the spacing and the height of the steel columns are set.

[0049] Step (2): To ensure the stability of the steel columns, the front and rear rows of steel columns are connected in pairs and connected by scissor bracing; the top of the steel column is provided with an installation slot, and the load-bearing beam is installed in the installation slot and welded to fix it in place, in accordance with the installation inclination; the load-bearing beam is reinforced by connecting plates and ribs during installation to form a stable support.

[0050] Step (3): Install the Bailey bridge from bottom to top; The Bailey bridge is set on the load-bearing beam, with the upper, middle and lower Bailey bridges installed in sequence. One bottom end of the lower Bailey bridge is fixedly connected to the second pre-embedded steel plate set on the lower bridge abutment to ensure a rigid connection. A top steel plate is set on the lower bridge abutment, with one end of the top steel plate set on the Bailey bridge and the other end extending to the bottom slope position; The upper Bailey bridge is installed on the first inclined steel plate pre-embedded on the upper bridge abutment, and the first inclined steel plate and the upper Bailey bridge are connected by sliding supports to ensure buffering and prevent the abutment from jumping.

[0051] Step (4): Install bridge deck steel plates and ancillary facilities. Install transverse distribution beams on the Bailey bridge in sequence and then install bridge deck steel plates on them. After installing the bridge deck steel plates, set up sidewalks and guardrails. Finally, backfill and harden the bottom slope.

[0052] Step (5): After the construction is completed, a test drive will be conducted. Finally, the construction of the steel trestle bridge pit ramp will be completed and accepted. After the use is over, the steel trestle bridge pit ramp will be dismantled in sequence for recycling.

[0053] During construction, column piles are pre-constructed in the area where the steel trestle bridge is to be built. Load-bearing beams, Bailey bridges, distribution beams and bridge deck steel plates are respectively installed on the top of the piles. After the bridge deck steel plates are constructed, anti-collision beams are welded on both sides of the carriageway, guardrails are installed on the outside of the pedestrian walkway, and anti-slip steel bars are welded on the bridge deck to ensure the safety of vehicles and personnel going up and down the foundation pit.

[0054] In a specific embodiment, the foundation pit is set to a depth of 13.1~15.5m. A steel structure trestle bridge is constructed on the northwest side of the foundation pit as a ramp to the bottom. The steel pipe columns of the trestle bridge are φ609mm×16mm. The trestle bridge has a height difference of 14.7m, a local slope of 1:7.5, and a length of approximately 89m. The bridge deck steel plate is made of 10mm thick checkered steel plate, with anti-slip steel bars welded to the plate. The steel trestle bridge is constructed by pre-embedding bolts and steel plates in the base structure, and then welding steel pipe columns onto the steel plates. The foundation pit base structure must be constructed before the trestle bridge can be built.

[0055] A 1.2m wide pedestrian walkway and a 6.64m wide vehicular roadway are provided on one side of the steel trestle bridge. The load-bearing structure is a Bailey bridge with a designed span of 9m + 3m. It employs three φ609mm×16mm steel pipe columns (the first row has only two steel pipe columns due to the influence of cast-in-place piles). The transverse steel pipe columns are reinforced with 16a channel steel as shear bracing between them and the adjacent supporting piles. The longitudinal horizontal bracing of the steel pipe columns uses double-splittered 16a channel steel as shear bracing to improve the overall stability of the steel pipe column foundation. The pile tops are supported by double-splittered 45c I-beam load-bearing beams.

[0056] The main girder of the main trestle bridge is a Bailey bridge, consisting of 8 Bailey beams. Each group is connected by a standard 900mm support frame to increase overall stress and stability. I20a I-beams are arranged laterally at each node of the upper part of the main girder, and the bridge deck is made of 10mm thick steel plates.

[0057] During the construction of the bottom slope, the soil layers need to be compacted layer by layer according to the design to ensure the required thickness of each layer. Considering the height of the slope top, a 10cm concrete cushion layer is used at the bottom, connected to the foundation pit floor slab. An 8-15cm gravel layer is placed on top of the cushion layer, followed by a 10-15cm medium sand layer. After compaction, a 20cm rubber granule layer is laid on top of the medium sand layer, and a 15-20cm clay layer is placed on top of the rubber granule layer, contacting the top steel plate. To ensure functional requirements, each layer is laid at an angle.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A recyclable steel trestle bridge pit ramp, comprising steel columns (1), load-bearing beams (2), Bailey bridges (3), distribution beams (4), and bridge deck steel plates (5), wherein the steel columns are arranged from high to low along the slope of the pit, load-bearing beams are installed on two steel columns in the same row, Bailey bridges are installed on the load-bearing beams, the distribution beams are fixed to the Bailey bridges by fasteners, and bridge deck steel plates are installed on the distribution beams; characterized in that: At least two rows of steel columns are provided with longitudinal bracing, which is set as a scissor brace (11) of double-channel steel; the steel columns are provided with mounting slots (12), the width of which is the same as the width of the load-bearing beam, and mounting side plates (13) are provided on both sides of the mounting slots; the load-bearing beam (2) is inclined at both ends and set on the steel columns, and the bottom surface of the load-bearing beam and the bottom of the mounting slot (12) are both inclined and matched, and the inclination angle is consistent with the inclination angle of the bridge deck steel plate; at the top and bottom of the foundation pit Each section is provided with an upper bridge abutment (6) and a lower bridge abutment (7), both of which are concrete structures. A first inclined steel plate (61) is embedded on the upper bridge abutment. The first inclined steel plate and the upper Bailey bridge (31) are connected by a sliding support (62). The other end of the upper Bailey bridge is fixedly connected to the load-bearing beam (2). Multiple intermediate Bailey bridges (32) are sequentially arranged on the upper part of the load-bearing beam. One end of the lower Bailey bridge (33) is fixedly connected to the load-bearing beam, and the other end is connected to the lower bridge abutment (6). 7) The second pre-embedded steel plate (71) is fixedly connected to the lower abutment; the lower abutment is also provided with a top steel plate (72), the top steel plate (72) and the bridge deck steel plate (5) are inclined at the same angle, and the extension surface of the bridge deck steel plate and the top plate steel plate are on the same plane, and the top steel plate is fixed to the top surface of the lower abutment (7) by studs (73); a fill slope (8) is provided on one side of the lower abutment, and one end of the top steel plate is set on the lower Bailey frame (33), and the other end extends to the bottom slope (8); The sliding support (62) is provided with a sliding plate (620), a limiting groove (621), a limiting rubber (622), and a limiting post (623). The upper Bailey frame is placed on the sliding plate (620). The limiting groove (621) is provided in the sliding plate. The limiting post (623) is fixed to the upper Bailey frame. The limiting post is inserted into the limiting groove and is wrapped by the limiting rubber (622). When the upper Bailey frame is subjected to lateral force, it drives the limiting post to move in the limiting groove (621). The limiting rubber plays a buffering role.

2. The recyclable steel trestle bridge foundation pit ramp according to claim 1, characterized in that: Transverse distribution beams (9) are provided on the upper, middle and lower Bailey bridges, and bridge deck steel plates are provided on the transverse distribution beams.

3. The recyclable steel trestle bridge foundation pit ramp according to claim 1, characterized in that: The load-bearing beam is welded with a connecting plate (21) and a rib plate (22). The connecting plate connects the load-bearing beam and the mounting side plate (13) of the steel pipe column, and the rib plate connects the lower part of the load-bearing beam and the side of the steel pipe column.

4. The recyclable steel trestle bridge foundation pit ramp according to claim 2, characterized in that: The upper, middle and lower Bailey bridges are fixed to the transverse distribution beam (9) by U-shaped fasteners (10), and the two legs of the U-shaped fasteners are threaded; the transverse distribution beam is an I-shaped steel, wherein the two legs of the U-shaped fasteners extend into the lower flange of the I-shaped steel and are tightened by nuts.

5. The recyclable steel trestle bridge foundation pit ramp according to claim 2, characterized in that: The method of filling the earth slope is as follows: a concrete cushion layer (80) is used at the bottom and connected to the bottom plate of the foundation pit. A gravel layer (81) is set on the cushion layer. A medium sand particle layer (82) is filled on the gravel layer and compacted. After compaction, a rubber particle layer (83) is laid on the medium sand particle layer. A clay layer (84) is set on the top of the rubber particle layer. The clay layer is in contact with the top steel plate.

6. The recyclable steel trestle bridge foundation pit ramp according to claim 2, characterized in that: A sidewalk (14) and a guardrail (15) are provided on the steel plate of the bridge deck. The guardrail is formed by inserting steel pipes into the preset holes of the steel plate of the bridge deck.

7. A recyclable steel trestle bridge foundation pit ramp according to claim 2, characterized in that: At least two rows of steel columns form a steel column support assembly, which is connected by longitudinal horizontal bracing. The longitudinal horizontal bracing is set as a scissor brace of double channel steel, and the scissor brace is set along the height direction of the steel column.

8. A construction method for a recyclable steel trestle bridge foundation pit ramp according to any one of claims 1-7, characterized in that: Step (1): Preparation work, first carry out pile foundation positioning and slope design, level the bottom, pour concrete at the bottom of the foundation pit, and then construct steel columns in sequence; steel pipe piles are designed to match the slope angle, arranged according to the spacing and the height of the steel columns are set. Step (2): To ensure the stability of the steel columns, the front and rear rows of steel columns are connected in pairs and connected by scissor bracing; the top of the steel column is provided with an installation slot, and the load-bearing beam is installed in the installation slot and welded to fix it in place, in accordance with the installation inclination; the load-bearing beam is reinforced by connecting plates and ribs during installation to form a stable support. Step (3): Install the Bailey bridge from bottom to top; The Bailey bridge is set on the load-bearing beam, with the upper, middle and lower Bailey bridges installed in sequence. One bottom end of the lower Bailey bridge is fixedly connected to the second pre-embedded steel plate set on the lower bridge abutment to ensure a rigid connection. A top steel plate is set on the lower bridge abutment, with one end of the top steel plate set on the Bailey bridge and the other end extending to the bottom slope position; The upper Bailey bridge is installed on the first inclined steel plate pre-embedded on the upper bridge abutment, and the first inclined steel plate and the upper Bailey bridge are connected by sliding supports to ensure buffering and prevent the abutment from jumping. Step (4): Install bridge deck steel plates and ancillary facilities. Install transverse distribution beams on the Bailey bridge in sequence and then install bridge deck steel plates on them. After installing the bridge deck steel plates, set up sidewalks and guardrails. Finally, backfill and harden the bottom slope. Step (5): After the construction is completed, a test drive will be conducted. Finally, the construction of the steel trestle bridge pit ramp will be completed and accepted. After the use is over, the steel trestle bridge pit ramp will be dismantled in sequence for recycling.

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