Foundation pit steel trestle structure and construction method thereof

Abstract

The application discloses a foundation pit steel trestle structure and a construction method thereof, and belongs to the field of construction engineering. The foundation pit steel trestle structure comprises three trestle beams, and opposite sides of the beam surface of the two outer side trestle beams are provided with check dams; a riding beam support is arranged, the bottom of the riding beam support is provided with a through groove, the top of the other middle trestle beam is slidably arranged in the through groove, a locking piece is arranged in the through groove, opposite sides of the riding beam support are provided with notches towards the outer side trestle beams, the bottom wall of the notch is flush with the beam surface of the outer side trestle beam, and a locking rod is arranged on the side wall of the notch; a steel bridge deck is arranged, one end of the steel bridge deck is embedded in the notch, a locking hole is formed in one end of the steel bridge deck, the locking rod is detachably inserted into the locking hole, the other end of the steel bridge deck is overlapped with the beam surface of the outer side trestle beam, and a compensation groove is formed between the other end of the steel bridge deck and the check dam and the beam surface of the outer side trestle beam; and post-cast concrete is poured into the compensation groove. The application solves the problem that the construction precision of the concrete trestle beam is insufficient, the distance between the trestle beams and the length of the steel trestle bridge deck are not matched, and the steel trestle bridge deck cannot be overlapped.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a steel trestle bridge structure for foundation pits and its construction method. Background Technology

[0002] During the construction phase of foundation pits and underground structures, trestle bridges are typically installed. Concrete trestle bridges are a commonly used type. To reduce concrete waste and facilitate trestle bridge construction, steel trestle panels are now being used instead of concrete panels. The concrete trestle bridge structure, columns, and other components remain unchanged, while the steel trestle panels overlap the concrete beams, forming a new type of trestle bridge structure. Steel trestle panels are generally prefabricated with fixed lengths and widths, facilitating turnover and saving costs. However, the spacing of concrete trestle bridges in foundation pits is designed according to the pit's stress, deformation, and vertical loads. The spacing may not match the length of the steel trestle panels, rendering them unusable. In some cases, the construction precision of the concrete support beams is insufficient to meet the overlap length requirements of the steel trestle panels. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a steel trestle bridge structure for foundation pits and its construction method are provided to solve the problems of insufficient construction precision of concrete trestle bridges and mismatch between the spacing of trestle bridges and the length of steel trestle bridge panels, which leads to the inability to overlap the steel trestle bridge panels.

[0004] To achieve the above objectives, a steel trestle bridge structure for foundation pits is provided, comprising:

[0005] The three-stack bridge is set in the same direction, and the opposite sides of the beams of the two outer stack bridges form retaining walls.

[0006] A beam support is provided, with a through groove formed at the bottom of the beam support. The top of another intermediate trestle bridge is slidably disposed in the through groove. A locking element for locking the other intermediate trestle bridge is installed in the through groove. Notches facing the outer trestle bridge are formed on opposite sides of the beam support. The bottom wall of the notch is flush with the beam surface of the outer trestle bridge. A locking rod is installed on the side wall of the notch.

[0007] A steel bridge deck, one end of which is embedded in the notch, and a locking hole is provided at one end of the steel bridge deck. The locking rod is detachably inserted into the locking hole. The other end of the steel bridge deck overlaps the beam surface of the outer trestle bridge. A compensation groove is formed between the other end of the steel bridge deck and the retaining wall and the beam surface of the outer trestle bridge.

[0008] The concrete is then poured into the compensation trench.

[0009] Furthermore, a guardrail is installed on the retaining wall.

[0010] Furthermore, the top of the beam support is flush with the surface of the steel bridge deck.

[0011] Furthermore, the sidewall of the notch is provided with an assembly hole, and one end of the locking rod is elastically installed in the assembly hole.

[0012] Furthermore, the top of the beam support is provided with a connecting hole that connects to the assembly hole. A drive rod is installed in the connecting hole in a way that allows it to be raised and lowered. The lower end of the drive rod is connected to a conical head. The end of the locking rod away from the steel bridge deck abuts against the side of the conical head.

[0013] Furthermore, mounting holes are provided on the walls of the groove on both sides of the through groove, and the locking component is a jack. The jack is installed in the mounting hole, and the telescopic end of the jack extends into the through groove and presses against the intermediate trestle bridge.

[0014] Furthermore, a first shock-absorbing pad is provided between the other end of the steel bridge deck and the beam surface of the outer trestle bridge.

[0015] Furthermore, a second shock-absorbing pad is laid on the beam surface of the intermediate trestle bridge.

[0016] This invention provides a construction method for a steel trestle bridge structure for foundation pits, comprising the following steps:

[0017] The construction involves three trestle bridges arranged in the same direction, with retaining walls formed on the opposite sides of the beams of the two outer trestle bridges.

[0018] The through groove of the as-beam support is slidably placed on the top of another intermediate trestle bridge, so that the bottom wall of the notch of the as-beam support is flush with the beam surface of the outer trestle bridge.

[0019] One end of the steel bridge panel is embedded in the notch, so that the locking rod is inserted into the locking hole of the steel bridge panel, and the other end of the steel bridge panel is overlapped with the beam surface of the outer trestle bridge, so that a compensation groove is formed between the other end of the steel bridge panel and the retaining wall and the beam surface of the outer trestle bridge.

[0020] Post-cast concrete is poured into the compensation trench.

[0021] The beneficial effects of this invention are as follows: the steel trestle bridge structure for the foundation pit of this invention uses locking components to stably install the straddle beam support on the middle trestle bridge, and then lays steel trestle bridge plates on the straddle beam support and the outer trestle bridges on both sides. A compensation groove is formed between the steel trestle bridge plates and the retaining walls on the outer trestle bridges, and concrete is poured into the compensation groove to compensate for the insufficient construction precision of the trestle bridge and the insufficient length of the steel trestle bridge plates. This effectively transmits force, resists overturning, locks tightly with the concrete trestle bridge, and is safe and reliable. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the foundation pit steel trestle structure according to an embodiment of the present invention.

[0024] Figures 2 to 6 This is a schematic diagram illustrating the construction steps of a steel trestle bridge structure for a foundation pit, according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the locking component according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the locking rod according to an embodiment of the present invention. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Reference Figures 1 to 8 As shown, the present invention provides a steel trestle bridge structure for foundation pits, including: trestle bridge 1, assemblage support 2, steel bridge deck 3, and post-cast concrete 4.

[0030] Piles 11 are embedded in the foundation pit 10. Concrete trestle bridges 1 are poured on the piles. There are three trestle bridges. The three trestle bridges 1 are arranged in the same direction. Retaining sills 12 are formed on the opposite sides of the beams of the two outer trestle bridges 1.

[0031] In this embodiment, a guardrail 13 is installed on the retaining wall 12.

[0032] In some embodiments, the retaining wall and the trestle bridge are cast integrally. In other embodiments, the retaining wall and the guardrail are precast integrally. After the trestle bridge is cast, the retaining wall and the guardrail are installed on the trestle bridge.

[0033] The length of the asphalt support 2 is adapted to the length of the trestle bridge. The width of the asphalt support is greater than the width of the trestle bridge. The asphalt support is set along the length of the trestle bridge. A through groove is formed at the bottom of the asphalt support 2. The top of another intermediate trestle bridge 1 slides in the through groove. A locking element 21 is installed in the through groove. The locking element 21 is used to lock the other intermediate trestle bridge 1. Notches 20 are formed on opposite sides of the asphalt support 2, facing the outer trestle bridge 1. The bottom wall of the notch 20 is flush with the beam surface of the outer trestle bridge 1. The top of the asphalt support 2 is flush with the surface of the steel bridge deck 3. Locking rods 24 are installed on the side walls of the notch 20.

[0034] In a preferred embodiment, the sidewall of the notch 20 has a mounting hole. One end of the locking rod 24 is elastically mounted in the mounting hole. Specifically, the locking rod is connected to the bottom of the mounting hole by a spring.

[0035] The steel bridge deck 3 comprises multiple unit panels. One end of the steel bridge deck 3 is embedded in the notch 20. A locking hole is provided at one end of the steel bridge deck 3. A locking rod 24 is detachably inserted into the locking hole. The other end of the steel bridge deck 3 overlaps with the beam surface of the outer trestle bridge 1. A compensation groove 40 is formed between the other end of the steel bridge deck 3 and the retaining wall 12 and the beam surface of the outer trestle bridge 1.

[0036] The post-cast concrete 4 is poured into the compensation trench 40. In this embodiment, the post-cast concrete 4 is fine aggregate concrete.

[0037] See Figure 7 and Figure 8 As shown, in this embodiment, the top of the beam support 2 has a connecting hole that communicates with the assembly hole. A drive rod 22 is vertically mounted in the connecting hole. A tapered head is connected to the lower end of the drive rod 22. The end of the locking rod 24 away from the steel bridge deck 3 rests against the side of the tapered head.

[0038] In a preferred embodiment, mounting holes are provided on the opposite sides of the channel wall. The locking element 21 is a jack. The jack is installed in the mounting hole. The telescopic end of the jack extends into the channel and presses against the intermediate trestle bridge 1.

[0039] As a preferred embodiment, a first shock-absorbing pad 14 is provided between the other end of the steel bridge deck 3 and the beam surface of the outer trestle bridge 1.

[0040] As a preferred embodiment, the beam surface of the intermediate trestle bridge 1 is paved with a second shock-absorbing pad 15.

[0041] See Figures 2 to 6 As shown, the present invention provides a construction method for a steel trestle bridge structure for foundation pits, comprising the following steps:

[0042] S1. Construct column piles 11 within the foundation pit 10, construct three-tiered bridges 1 arranged in the same direction on the column piles 11, and form retaining walls 12 on the opposite sides of the beam surfaces of the two outer tiered bridges 1 respectively.

[0043] The foundation pit was constructed according to the design drawings, including retaining walls, lintels, column piles, support beams, and trestle bridges. Steel trestle panels were used for the steel bridge deck. These trestle panels have fixed lengths, widths, and heights; custom-made panels for a single project would be costly. It is common for the trestle panels to not overlap the main beams or for the overlap length to be insufficient, making their use impossible. Simultaneously, friction, noise reduction, and vibration damping rubber pads (first and second vibration damping pads) were installed on the main beams of the trestle bridge.

[0044] The construction of trestle bridge 1 includes retaining walls, which are poured simultaneously with the trestle bridge. The rubber padding layer uses S-shaped and L-shaped clips, installed on top of the trestle bridge, and is reusable. The rubber padding layer exhibits minimal deformation, is reusable, and fully utilizes its functions of friction, noise reduction, and vibration damping.

[0045] S2. Slide the through groove of the assail support 2 onto the top of another intermediate trestle bridge 1, so that the bottom wall of the notch 20 of the assail support 2 is flush with the beam surface of the outer trestle bridge 1.

[0046] The assemblage support is hoisted onto the intermediate trestle bridge. The laser level 5 on both outer trestle bridges is aligned with the center of target point 51 to complete the leveling adjustment. The laser on the intermediate trestle bridge is aligned with the central axis to complete the axis adjustment. By controlling the extension and retraction of the jacks, the intermediate trestle bridge is pressed against it, forming a locking structure that prevents loosening, effectively transmits force, prevents overturning, and provides a stable support point for the steel trestle bridge connection. Leveling is achieved using the extension and retraction of the jacks, the laser level, and the target point in combination.

[0047] S3. One end of the steel bridge deck 3 is embedded in the notch 20, so that the locking rod 24 is inserted into the locking hole of the steel bridge deck 3, and the other end of the steel bridge deck 3 is overlapped with the beam surface of the outer trestle bridge 1, so that the other end of the steel bridge deck 3 forms a compensation groove 40 between the retaining wall 12 and the beam surface of the outer trestle bridge 1.

[0048] Then, using the central structure of the asphalt beam support as a base point, the steel bridge deck is installed, and the error adjustment is placed on the outer trestle bridges on both sides. The steel bridge deck has locking holes on its sides. A support plate is fixed inside the connecting hole of the asphalt beam support. The support plate has threaded holes. The drive rod has external threads. The drive rod is screwed into the threaded hole. Rotating the drive rod causes the lower conical head of the drive rod to rise and fall, thereby pushing the locking rod with the conical head to insert the locking rod into the locking hole of the steel bridge deck, forming a stable overall structure.

[0049] Once paved, a road is formed, with paving starting from one end and ending at the other.

[0050] S4. Pour post-cast concrete 4 into the compensation trench 40.

[0051] Fine aggregate concrete was poured into the compensation grooves on the outer side trestle bridges on both sides to limit the cross-sectional shape of the steel bridge deck. Finally, guardrails were installed on the retaining wall.

[0052] The demolition also proceeded from one end to the other.

[0053] The foundation pit steel trestle structure of the present invention uses locking components to stably install the straddle beam support onto the middle trestle bridge. Then, steel trestle bridge plates are laid on the straddle beam support and the outer trestle bridges on both sides. A compensation groove is formed between the steel trestle bridge plates and the retaining walls on the outer trestle bridges. Concrete is poured into the compensation groove to compensate for the insufficient construction precision of the trestle bridge and the insufficient length of the steel trestle bridge plates. This structure can effectively transmit force, resist overturning, lock tightly with the concrete trestle bridge, and is safe and reliable.

[0054] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A steel trestle bridge structure for foundation pits, characterized in that, include: The three-stack bridge is set in the same direction, and the opposite sides of the beams of the two outer stack bridges form retaining walls. A beam support is provided, with a through groove formed at the bottom of the beam support. The top of the intermediate trestle bridge is slidably disposed in the through groove. A locking element for locking the intermediate trestle bridge is installed in the through groove. Notches facing the outer trestle bridge are formed on opposite sides of the beam support. The bottom wall of the notch is flush with the beam surface of the outer trestle bridge. A locking rod is installed on the side wall of the notch. A steel bridge deck, one end of which is embedded in the notch, and a locking hole is provided at one end of the steel bridge deck. The locking rod is detachably inserted into the locking hole. The other end of the steel bridge deck overlaps the beam surface of the outer trestle bridge. A compensation groove is formed between the other end of the steel bridge deck and the retaining wall and the beam surface of the outer trestle bridge. Post-concrete pouring is carried out into the compensation groove; The top of the beam support is flush with the surface of the steel bridge deck. The side wall of the notch is provided with an assembly hole, and one end of the locking rod is elastically installed in the assembly hole; The top of the beam support is provided with a connecting hole that connects to the assembly hole. A drive rod is installed in the connecting hole in a way that allows it to be raised and lowered. The lower end of the drive rod is connected to a conical head. The end of the locking rod away from the steel bridge deck is supported on the side of the conical head. The groove walls on both sides of the through groove are provided with mounting holes. The locking component is a jack. The jack is installed in the mounting hole. The telescopic end of the jack extends into the through groove and presses against the intermediate trestle bridge.

2. The foundation pit steel trestle structure according to claim 1, characterized in that, The retaining wall is equipped with a guardrail.

3. The foundation pit steel trestle bridge structure according to claim 1, characterized in that, A first shock-absorbing pad is placed between the other end of the steel bridge deck and the beam surface of the outer trestle bridge.

4. The foundation pit steel trestle bridge structure according to claim 1, characterized in that, The beam surface of the intermediate trestle bridge is covered with a second shock-absorbing pad.

5. A construction method for a steel trestle bridge structure for a foundation pit as described in any one of claims 1 to 4, characterized in that, Includes the following steps: The construction involves three trestle bridges arranged in the same direction, with retaining walls formed on the opposite sides of the beams of the two outer trestle bridges. The through groove of the as-beam support is slidably placed on the top of the middle trestle bridge, so that the bottom wall of the notch of the as-beam support is flush with the beam surface of the outer trestle bridge. One end of the steel bridge panel is embedded in the notch, so that the locking rod is inserted into the locking hole of the steel bridge panel, and the other end of the steel bridge panel is overlapped with the beam surface of the outer trestle bridge, so that a compensation groove is formed between the other end of the steel bridge panel and the retaining wall and the beam surface of the outer trestle bridge. Post-cast concrete is poured into the compensation trench.

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