Trestle structure using underground diaphragm wall and top ring beam as foundation near subway foundation pit
By setting up components such as the first support and limiting blocks on the foundation of the underground continuous wall and the top ring beam, a simple trestle structure was formed, which solved the problems of difficult movement of excavators and dump trucks in the foundation pit adjacent to the subway and the deformation of the subway tunnel, thus achieving safe and efficient construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA CONSTR EIGHTH ENG BUREAU TECH CONSTR CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-15
AI Technical Summary
The subway foundation pit cannot meet the normal driving requirements of large excavators and fully loaded dump trucks, and the reinforced concrete trestle bridge will cause significant deformation to the subway tunnel, affecting construction space and safety.
The trestle structure, based on underground continuous walls and top ring beams, is simple in structure by setting up the first support of the foundation pit, limiting blocks, cantilever trestle slabs, trestle slabs, partitions and filling concrete, which meets the requirements of excavator positioning and dump truck movement, and avoids the subway from bearing a large load.
It facilitates the positioning of excavators and the movement of dump trucks, avoids deformation of subway tunnels, is simple to construct and low in cost, and is suitable for large-scale promotion.
Smart Images
Figure CN224243652U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation pit engineering technology, and particularly to the field of trestle structure technology for foundation pits near subway lines. Specifically, it refers to a trestle structure for foundation pits near subway lines that utilizes underground continuous walls and top ring beams as its foundation. Background Technology
[0002] Foundation pit engineering refers to the measures taken to ensure the safety and stability of underground spaces created by excavation from the ground during the construction of underground structures, including retaining structures, groundwater control, and environmental protection. Foundation pit engineering is a systematic project integrating geological engineering, geotechnical engineering, structural engineering, and geotechnical testing technology. Its main contents include: engineering investigation, support structure design and construction, earthwork excavation and backfilling, groundwater control, information-based construction, and surrounding environmental protection.
[0003] Currently, the main problems existing in the foundation pits adjacent to subway stations are as follows:
[0004] 1. Subway foundation pits generally have strict requirements on the load-bearing capacity of roads outside the pit, which cannot meet the normal driving requirements of large excavators and fully loaded dump trucks.
[0005] 2. The perimeter of the subway foundation pit is too close to the land boundary, which cannot meet the requirements for excavator positioning and dump truck movement;
[0006] 3. Subway-adjacent foundation pits are mostly narrow pits, and steel supports with servo systems are generally used. If reinforced concrete trestle bridges are used, it will have a significant impact on the subsequent earthwork excavation, support installation and dismantling work in terms of space.
[0007] Therefore, it is desirable to provide a trestle structure for subway foundation pits that can meet the requirements for excavator positioning and dump truck movement, and can effectively prevent the subway from bearing large loads and effectively prevent large deformation of the subway tunnel. Utility Model Content
[0008] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a trestle structure based on underground continuous walls and top ring beams for subway foundation pits. It can meet the requirements of excavator positioning and dump truck driving, and can effectively avoid large loads on the subway and large deformation of the subway tunnel. It is suitable for large-scale promotion and application.
[0009] Another objective of this invention is to provide a trestle structure based on underground continuous walls and top ring beams for subway foundation pits. It is ingeniously designed, simple in structure, easy to construct, and has low construction costs, making it suitable for large-scale promotion and application.
[0010] To achieve the above objectives, this utility model provides a trestle structure for a subway foundation pit, based on a diaphragm wall and a top ring beam. The structure includes a top ring beam and a diaphragm wall, both vertically arranged and running longitudinally and laterally spaced apart. The trestle structure further includes a first support for the foundation pit, a limiting block, a cantilevered trestle slab, a trestle slab, a left partition, a right partition, left filling concrete, and right filling concrete.
[0011] The first support of the foundation pit is vertically arranged and extends along the left-right direction. The first support of the foundation pit is located between the top ring beam and the diaphragm wall and connects the top ring beam and the diaphragm wall respectively. The top elevation of the first support of the foundation pit is flush with the top elevation of the top ring beam. The limiting block is vertically arranged and extends along the front-back direction on the first support of the foundation pit. There are multiple first supports of the foundation pit, which are spaced apart from each other. The number of limiting blocks is the same as the number of first supports of the foundation pit, and the limiting blocks are arranged in a one-to-one correspondence with the first supports of the foundation pit.
[0012] The cantilevered trestle is horizontally arranged along the front-rear direction. The right side of the cantilevered trestle is located on the top ring beam. The front and rear ends of the trestle are respectively located on two adjacent first supports of the foundation pit. There are multiple trestle panels, which are arranged from left to right to form a trestle panel assembly. The left side of the leftmost trestle panel is located on the top ring beam and to the right of the cantilevered trestle. The top elevation of the trestle panel is flush with the top elevation of the cantilevered trestle. The front and rear ends of the rightmost trestle panel are respectively located to the left of two adjacent limiting blocks. There are multiple trestle panel assemblies, which are arranged from front to back to form the main body of the trestle. The rear ends of the trestle panel in the front trestle panel assembly and the front ends of the trestle panel in the rear trestle panel assembly are both located on the same first support of the foundation pit.
[0013] Both the left and right partitions are vertically arranged and along the front-rear direction. The left partition is located between the cantilevered trestle slab and the trestle body, abutting against the trestle body and supported on the top ring beam. The left filling concrete is filled between the cantilevered trestle slab, the top ring beam, and the left partition. The right partition is located between the trestle body and the limiting block, abutting against the trestle body and supported on the first support of the foundation pit. The right filling concrete is filled between the right partition, the first support of the foundation pit, and the limiting block.
[0014] Preferably, the first support of the foundation pit is the first reinforced concrete support of the foundation pit.
[0015] Preferably, the limiting block is a reinforced concrete limiting block.
[0016] Preferably, the cantilevered trestle deck is a cantilevered reinforced concrete trestle deck.
[0017] More preferably, the cantilevered reinforced concrete trestle slab is provided with top transverse reinforcement, bottom transverse reinforcement, top longitudinal reinforcement, and bottom longitudinal reinforcement. The top transverse reinforcement and the bottom transverse reinforcement are arranged alternately vertically. The left end of the top transverse reinforcement is bent downwards, and the left end of the bottom transverse reinforcement is inclined to the upper right. The right ends of both the top transverse reinforcement and the bottom transverse reinforcement are bent downwards and extend into the top ring beam. The top longitudinal reinforcement and the bottom longitudinal reinforcement are arranged alternately vertically and are located between the top transverse reinforcement and the bottom transverse reinforcement, and are located on the left side of the cantilevered reinforced concrete trestle slab. There are multiple top longitudinal reinforcements, which are arranged alternately horizontally. The number of bottom longitudinal reinforcements is the same as the number of top longitudinal reinforcements, and the bottom longitudinal reinforcements and the top longitudinal reinforcements are arranged in a one-to-one correspondence.
[0018] Preferably, the trestle structure based on the underground continuous wall and the top ring beam for the subway foundation pit further includes a reinforcing haunch. The reinforcing haunch is horizontally arranged and arranged along the front-rear direction. The reinforcing haunch is located below the middle of the cantilever trestle slab and to the left of the top ring beam, and is respectively connected to the middle of the cantilever trestle slab and the top ring beam.
[0019] More preferably, the reinforcing armpit is a reinforced concrete reinforcing armpit.
[0020] Furthermore, the reinforced concrete haunch is provided with inclined reinforcing bars and longitudinal reinforcing bars. The inclined reinforcing bars are inclined downwards and to the right from left to right. The left end of the inclined reinforcing bars extends horizontally to the left along the inclined direction of the inclined reinforcing bars into the cantilevered reinforced concrete trestle slab. The right end of the inclined reinforcing bars extends horizontally to the top ring beam along the inclined direction of the inclined reinforcing bars. The longitudinal reinforcing bars are located above the inclined reinforcing bars. There are multiple longitudinal reinforcing bars, which are spaced apart from each other in a direction parallel to the inclined direction of the inclined reinforcing bars.
[0021] Preferably, the trestle deck is a steel trestle deck.
[0022] Preferably, both the left and right partitions are extruded polystyrene boards, and both the left and right filling concretes are fine aggregate concrete.
[0023] The main beneficial effects of this utility model are as follows:
[0024] 1. When constructing the temporary bridge structure based on the underground continuous wall and the top ring beam for the subway foundation pit of this utility model, the first support of the foundation pit is set between the top ring beam and the diaphragm wall. A limiting block is set on the first support of the foundation pit. A cantilevered temporary bridge plate is set on the top ring beam. The temporary bridge plate is installed on the first support of the foundation pit and the top ring beam between the cantilevered temporary bridge plate and the limiting block. A left partition plate is set on the left side of the temporary bridge plate and on the top ring beam, and a right partition plate is set on the right side of the temporary bridge plate and on the first support of the foundation pit. The gap between the cantilevered temporary bridge plate and the left partition plate on the top ring beam is filled with left-filled concrete, and the gap between the right partition plate and the limiting block on the first support of the foundation pit is filled with right-filled concrete. Therefore, it can meet the requirements of excavator positioning and dump truck driving, and can effectively avoid the subway from bearing a large load, effectively avoid the subway tunnel from generating large deformations, and is suitable for large-scale promotion and application.
[0025] 2. When constructing the temporary bridge structure based on the underground continuous wall and the top ring beam for the subway foundation pit of this utility model, the first support of the foundation pit is set between the top ring beam and the diaphragm wall. A limiting block is set on the first support of the foundation pit. A cantilevered temporary bridge plate is set on the top ring beam. The temporary bridge plate is installed on the first support of the foundation pit and the top ring beam between the cantilevered temporary bridge plate and the limiting block. A left partition plate is set on the left side of the temporary bridge plate and on the top ring beam, and a right partition plate is set on the right side of the temporary bridge plate and on the first support of the foundation pit. The gap between the cantilevered temporary bridge plate and the left partition plate on the top ring beam is filled with left-filled concrete, and the gap between the right partition plate and the limiting block on the first support of the foundation pit is filled with right-filled concrete. Therefore, its design is ingenious, its structure is simple, its construction is convenient, its construction cost is low, and it is suitable for large-scale promotion and application.
[0026] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description
[0027] Figure 1 This is a partial front sectional view of a specific embodiment of the trestle structure based on underground continuous walls and top ring beams for subway foundation pits according to this utility model.
[0028] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the structure shown. Figure 1 .
[0029] Figure 3 yes Figure 1 A partially enlarged schematic diagram of the structure shown. Figure 2 .
[0030] Figure 4 yes Figure 1 A top-view perspective partial schematic diagram of a specific embodiment is shown.
[0031] (Symbol Explanation)
[0032] 1. Top ring beam; 2. Diaphragm wall; 3. First support for the foundation pit; 4. Limiting block; 5. Cantilevered trestle slab; 6. Trestle slab; 7. Left partition; 8. Right partition; 9. Left filling concrete; 10. Right filling concrete; 11. Trestle slab assembly; 12. Trestle main body; 13. Top transverse reinforcement; 14. Bottom transverse reinforcement; 15. Top longitudinal reinforcement; 16. Bottom longitudinal reinforcement; 17. Reinforcing haunch; 18. Inclined reinforcing reinforcement; 19. Longitudinal reinforcing reinforcement. Detailed Implementation
[0033] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.
[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] Please see Figures 1-4 As shown, in a specific embodiment of this utility model, the trestle structure for the subway foundation pit using a diaphragm wall and a top ring beam includes a top ring beam 1, a diaphragm wall 2, the first support of the foundation pit 3, a limiting block 4, a cantilevered trestle slab 5, a trestle slab 6, a left partition 7, a right partition 8, left filling concrete 9, and right filling concrete 10, wherein:
[0036] The top ring beam 1 and the diaphragm wall 2 are both vertically arranged and arranged along the front-to-back direction, and are spaced apart from each other on the left and right. The first support 3 of the foundation pit is vertically arranged and arranged along the left-to-right direction. The first support 3 of the foundation pit is located between the top ring beam 1 and the diaphragm wall 2 and connects the top ring beam 1 and the diaphragm wall 2 respectively. The top elevation of the first support 3 of the foundation pit is flush with the top elevation of the top ring beam 1. The limiting block 4 is vertically arranged and arranged on the first support 3 of the foundation pit along the front-to-back direction. There are multiple first supports 3 of the foundation pit, and the multiple first supports 3 of the foundation pit are spaced apart from each other on the front and back. The number of limiting blocks 4 is the same as the number of first supports 3 of the foundation pit. The limiting blocks 4 and the first supports 3 of the foundation pit are arranged in a one-to-one correspondence.
[0037] The cantilevered trestle slab 5 is horizontally arranged along the front-rear direction. The right side of the cantilevered trestle slab 5 is located on the top ring beam 1. The trestle slab 6 is horizontally arranged along the front-rear direction. The front and rear ends of the trestle slab 6 are respectively located on two adjacent first supports 3 of the foundation pit. There are multiple trestle slabs 6, which are arranged from left to right to form a trestle slab assembly 11. The leftmost trestle slab 6 is located on the top ring beam 1 and to the right of the cantilevered trestle slab 5. The top elevation of the cantilever trestle 5 is level with the top elevation of the cantilever trestle 6. The front and rear ends of the rightmost trestle 6 are located to the left of the two adjacent limiting blocks 4. There are multiple trestle assemblies 11. Multiple trestle assemblies 11 are arranged in sequence to form the trestle body 12. The rear end of the trestle 6 of the front trestle assembly 11 and the front end of the trestle 6 of the rear trestle assembly 11 are both set on the same first support 3 of the foundation pit.
[0038] The left partition 7 and the right partition 8 are both vertically arranged and both are arranged along the front-back direction. The left partition 7 is located between the cantilevered trestle slab 5 and the trestle body 12 and abuts against the trestle body 12 and is supported on the top ring beam 1. The left filling concrete 9 is filled between the cantilevered trestle slab 5, the top ring beam 1 and the left partition 7. The right partition 8 is located between the trestle body 12 and the limiting block 4 and abuts against the trestle body 12 and is supported on the first support 3 of the foundation pit. The right filling concrete 10 is filled between the right partition 8, the first support 3 of the foundation pit and the limiting block 4.
[0039] The number of the first support 3 for the foundation pit can be determined as needed. The term "multiple" refers to two or more. In a specific embodiment of this utility model, the number of the first support 3 for the foundation pit is six.
[0040] The number of the aforementioned bridge plate assemblies 11 can be determined as needed; please refer to [link / reference]. Figure 4 As shown, in a specific embodiment of this utility model, the number of the bridge plate assembly 11 is 5.
[0041] In the bridge plate assembly 11, the number of bridge plates 6 can be determined as needed. The term "multiple plates" refers to two or more plates. Please refer to [link to relevant documentation]. Figure 4 As shown, in a specific embodiment of this utility model, the number of the bridge plate 6 in the bridge plate assembly 11 is 3.
[0042] The first support 3 of the foundation pit can be made of any suitable material. In a specific embodiment of this utility model, the first support 3 of the foundation pit is a first reinforced concrete support for the foundation pit.
[0043] The limiting block 4 can be a limiting block of any suitable material. In a specific embodiment of this utility model, the limiting block 4 is a reinforced concrete limiting block.
[0044] The dimensions of the cross-section of the limiting block 4 can be determined as needed. In a specific embodiment of this utility model, the dimensions of the cross-section of the limiting block 4 are 400mm (length) * 400mm (width).
[0045] The cantilever trestle slab 5 can be made of any suitable material. In a specific embodiment of this utility model, the cantilever trestle slab 5 is a cantilever reinforced concrete trestle slab.
[0046] The cantilevered reinforced concrete trestle slab can have any suitable configuration; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the cantilevered reinforced concrete trestle slab 6 is provided with top transverse reinforcement 13, bottom transverse reinforcement 14, top longitudinal reinforcement 15, and bottom longitudinal reinforcement 16. The top transverse reinforcement 13 and the bottom transverse reinforcement 14 are arranged vertically and horizontally at intervals. The left end of the top transverse reinforcement 13 is bent downwards, and the left end of the bottom transverse reinforcement 14 is inclined upwards to the right. The right ends of both the top transverse reinforcement 13 and the bottom transverse reinforcement 14 are bent downwards and extend into the top ring beam 1. The top longitudinal reinforcement 15 and the bottom longitudinal reinforcement 16 are arranged vertically and horizontally at intervals, and are located between the top transverse reinforcement 13 and the bottom transverse reinforcement 14 and on the left side of the cantilevered reinforced concrete trestle slab 6. There are multiple top longitudinal reinforcements 15, which are arranged horizontally and horizontally at intervals. The number of bottom longitudinal reinforcements 16 is the same as the number of top longitudinal reinforcements 15, and the bottom longitudinal reinforcements 16 and the top longitudinal reinforcements 15 are arranged in a one-to-one correspondence.
[0047] The number of top longitudinal reinforcing bars 15 can be determined as needed. The term "multiple bars" refers to two or more bars. Please refer to [link to relevant documentation]. Figures 1-2 As shown, in a specific embodiment of this utility model, the number of top longitudinal steel bars 15 is 2.
[0048] The aforementioned trestle structure for the subway foundation pit, based on diaphragm walls and a top ring beam, may also include any other suitable components; please refer to [link / reference needed]. Figures 1-2As shown, in a specific embodiment of this utility model, the trestle structure based on the underground continuous wall and the top ring beam of the subway foundation pit further includes a reinforcing armhole 17. The reinforcing armhole 17 is horizontally arranged along the front-rear direction. The reinforcing armhole 17 is located below the middle of the cantilever trestle slab 5 and to the left of the top ring beam 1, and connects the middle of the cantilever trestle slab 5 and the top ring beam 1 respectively. With the above arrangement, the load-bearing capacity of the cantilever trestle slab 5 is improved through the reinforcing armhole 17.
[0049] The reinforcing armpit 17 can be made of any suitable material. In a specific embodiment of this utility model, the reinforcing armpit 17 is a reinforced concrete reinforcing armpit.
[0050] The reinforced concrete haunch can have any suitable configuration; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the reinforced concrete reinforcing armhole is provided with inclined reinforcing bars 18 and longitudinal reinforcing bars 19. The inclined reinforcing bars 18 are inclined downwards and to the right from left to right. The left end of the inclined reinforcing bars 18 extends into the cantilevered reinforced concrete trestle slab 6 along the inclined direction of the inclined reinforcing bars 18 and extends horizontally to the left. The right end of the inclined reinforcing bars 18 extends into the top ring beam 1 along the inclined direction of the inclined reinforcing bars 18. The longitudinal reinforcing bars 19 are located above the inclined reinforcing bars 18. There are multiple longitudinal reinforcing bars 19, which are spaced apart from each other in a direction parallel to the inclined direction of the inclined reinforcing bars 18.
[0051] The number of longitudinal reinforcing bars 19 can be determined as needed; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the number of longitudinal reinforcing bars 19 is 3.
[0052] The trestle plate 6 can be made of any suitable material. In a specific embodiment of this utility model, the trestle plate 6 is a steel trestle plate.
[0053] The left partition 7 and the right partition 8 can be any suitable type of partition. In a specific embodiment of this utility model, the left partition 7 and the right partition 8 are both extruded polystyrene boards.
[0054] The left filling concrete 9 and the right filling concrete 10 can be any suitable type of concrete. In a specific embodiment of this utility model, the left filling concrete 9 and the right filling concrete 10 are both fine aggregate concrete.
[0055] During construction, taking the example of the top ring beam 1 and the diaphragm wall 2 being vertically set and arranged along the front-to-back direction with left and right intervals, the first support 3 of the foundation pit is set between the top ring beam 1 and the diaphragm wall 2. The limiting block 4 is set on the first support 3 of the foundation pit. The cantilevered trestle slab 5 with the same thickness as the trestle slab 6 is set on the top ring beam 1. The trestle slab 6 is installed on the first support 3 of the foundation pit between the cantilevered trestle slab 5 and the limiting block 4 and on the top ring beam 1. A left partition 7 is set on the left side of the trestle slab 6 and on the top ring beam 1, and a right partition 8 is set on the right side of the trestle slab 6 and on the first support 3 of the foundation pit. The gap between the cantilevered trestle slab 5 and the left partition 7 on the top ring beam 1 is filled with left-filled concrete 9, and the gap between the right partition 8 and the limiting block 4 on the first support 3 of the foundation pit is filled with right-filled concrete 10.
[0056] A left partition 7 is installed on the top ring beam 1 between the cantilever trestle slab 5 and the trestle slab 6, and the gap between the cantilever trestle slab 5 and the left partition 7 is filled with left filling concrete 9. On the first support 3 of the foundation pit, a right partition 8 is installed between the trestle slab 6 and the limiting block 4, and the gap between the right partition 8 and the limiting block 4 is filled with right filling concrete 10 to prevent the trestle slab 6 from shifting.
[0057] In the case that the first support 3 of the foundation pit is the first reinforced concrete support of the foundation pit, the limiting block 4 is a reinforced concrete limiting block, the cantilever trestle slab 5 is a cantilever reinforced concrete trestle slab, and the reinforcing armhole 17 is a reinforced concrete reinforcing armhole, the first reinforced concrete support of the foundation pit is poured based on the diaphragm wall 2 and the top ring beam 1 (in order to strengthen the connection, reinforcing bars are usually pre-embedded in the diaphragm wall 2 and the top ring beam 1 before the first reinforced concrete support of the foundation pit is poured), and the reinforced concrete limiting block is poured on the first reinforced concrete support of the foundation pit, the cantilever reinforced concrete trestle slab is poured on the top ring beam 1, and the reinforced concrete reinforcing armhole is poured between the cantilever reinforced concrete trestle slab and the top ring beam 1.
[0058] Therefore, this utility model provides a trestle structure based on underground continuous walls and top ring beams for subway foundation pits, which is mainly applicable to situations where there is insufficient space outside the foundation pit to set up a roadway. This invention employs a method that involves setting up a primary support for the foundation pit between the top ring beam and the diaphragm wall, installing a limiting block on the primary support, and setting a cantilevered trestle on the top ring beam. The trestle is then installed on the primary support and the top ring beam between the cantilevered trestle and the limiting block. A left partition is installed on the left side of the trestle and on the top ring beam, and a right partition is installed on the right side of the trestle and on the primary support. The gap between the cantilevered trestle and the left partition is filled with left-side filler concrete, and the gap between the right partition and the limiting block is filled with right-side filler concrete. This method ensures that all loads above the trestle are transferred to the diaphragm wall, effectively preventing the subway from bearing excessive loads and avoiding significant deformation of the subway tunnel. This method can serve as a reference for subsequent trestle construction workers working on other subway foundation pits.
[0059] In summary, the trestle structure based on underground continuous walls and top ring beams for subway foundation pits of this utility model can meet the requirements for excavator positioning and dump truck movement, and can effectively avoid large loads above the subway and large deformation of the subway tunnel. It is ingeniously designed, simple in structure, easy to construct, and low in construction cost, making it suitable for large-scale promotion and application.
[0060] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.
Claims
1. A trestle structure for a subway foundation pit, utilizing a diaphragm wall and a top ring beam, comprising a top ring beam and a diaphragm wall, wherein both the top ring beam and the diaphragm wall are vertically arranged and positioned along the front-to-back direction, and are spaced apart from each other on the left and right sides, characterized in that... The aforementioned trestle structure for the subway foundation pit, based on a continuous underground wall and a top ring beam, also includes the first support for the foundation pit, a limiting block, a cantilevered trestle slab, a trestle slab, a left diaphragm, a right diaphragm, left filling concrete, and right filling concrete, wherein: The first support of the foundation pit is vertically arranged and extends along the left-right direction. The first support of the foundation pit is located between the top ring beam and the diaphragm wall and connects the top ring beam and the diaphragm wall respectively. The top elevation of the first support of the foundation pit is flush with the top elevation of the top ring beam. The limiting block is vertically arranged and extends along the front-back direction on the first support of the foundation pit. There are multiple first supports of the foundation pit, which are spaced apart from each other. The number of limiting blocks is the same as the number of first supports of the foundation pit, and the limiting blocks are arranged in a one-to-one correspondence with the first supports of the foundation pit. The cantilevered trestle is horizontally arranged along the front-rear direction. The right side of the cantilevered trestle is located on the top ring beam. The front and rear ends of the trestle are respectively located on two adjacent first supports of the foundation pit. There are multiple trestle panels, which are arranged from left to right to form a trestle panel assembly. The left side of the leftmost trestle panel is located on the top ring beam and to the right of the cantilevered trestle. The top elevation of the trestle panel is flush with the top elevation of the cantilevered trestle. The front and rear ends of the rightmost trestle panel are respectively located to the left of two adjacent limiting blocks. There are multiple trestle panel assemblies, which are arranged from front to back to form the main body of the trestle. The rear ends of the trestle panel in the front trestle panel assembly and the front ends of the trestle panel in the rear trestle panel assembly are both located on the same first support of the foundation pit. Both the left and right partitions are vertically arranged and along the front-rear direction. The left partition is located between the cantilevered trestle slab and the trestle body, abutting against the trestle body and supported on the top ring beam. The left filling concrete is filled between the cantilevered trestle slab, the top ring beam, and the left partition. The right partition is located between the trestle body and the limiting block, abutting against the trestle body and supported on the first support of the foundation pit. The right filling concrete is filled between the right partition, the first support of the foundation pit, and the limiting block.
2. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, The first support of the foundation pit is the first reinforced concrete support of the foundation pit.
3. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, The limiting block is a reinforced concrete limiting block.
4. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, The cantilevered trestle deck is a cantilevered reinforced concrete trestle deck.
5. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 4, characterized in that, The cantilevered reinforced concrete trestle slab is provided with top transverse reinforcement, bottom transverse reinforcement, top longitudinal reinforcement, and bottom longitudinal reinforcement. The top and bottom transverse reinforcements are arranged alternately vertically. The left end of the top transverse reinforcement is bent downwards, and the left end of the bottom transverse reinforcement is inclined upwards to the right. The right ends of both the top and bottom transverse reinforcements are bent downwards and extend into the top ring beam. The top and bottom longitudinal reinforcements are arranged alternately vertically and are located between the top and bottom transverse reinforcements and on the left side of the cantilevered reinforced concrete trestle slab. There are multiple top longitudinal reinforcements, which are arranged alternately horizontally. The number of bottom longitudinal reinforcements is the same as the number of top longitudinal reinforcements, and the bottom and top longitudinal reinforcements are arranged in a one-to-one correspondence.
6. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, The aforementioned trestle structure for the subway foundation pit, which utilizes a diaphragm wall and a top ring beam, also includes a reinforcing armhole. The reinforcing armhole is horizontally positioned along the front-rear direction. It is located below the middle of the cantilever trestle slab and to the left of the top ring beam, connecting the middle of the cantilever trestle slab and the top ring beam respectively.
7. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 6, characterized in that, The reinforcing armhole is a reinforced concrete reinforcing armhole.
8. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 7, characterized in that, The reinforced concrete haunch is provided with inclined reinforcing bars and longitudinal reinforcing bars. The inclined reinforcing bars are inclined downwards and to the right from left to right. The left end of the inclined reinforcing bars extends into the cantilever bridge slab along the inclined direction of the inclined reinforcing bars and extends horizontally to the left. The right end of the inclined reinforcing bars extends into the top ring beam along the inclined direction of the inclined reinforcing bars. The longitudinal reinforcing bars are located above the inclined reinforcing bars. There are multiple longitudinal reinforcing bars, which are spaced apart from each other in a direction parallel to the inclined direction of the inclined reinforcing bars.
9. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, The trestle deck is a steel trestle deck.
10. The trestle structure based on a diaphragm wall and a top ring beam for a subway foundation pit as described in claim 1, characterized in that, Both the left and right partitions are extruded polystyrene boards, and both the left and right filling concretes are fine aggregate concrete.