A concrete U-shaped roadbed connection structure and its construction method

Abstract

The present invention provides a concrete U-shaped subgrade connection structure and a construction method thereof. The structure includes a bottom plate, a lower side wall 1, a lower side wall 2, an upper side wall 1, an upper side wall 2, a connection steel plate, connection bolts, side wall bolts, longitudinal bolts, longitudinal prestressing tendons, etc. The bottom plate, the lower side wall 1, the lower side wall 2, the upper side wall 1, and the upper side wall 2 are prefabricated and then transported to the site. The bottom plate is assembled with the lower side wall 1 and the lower side wall 2, and the lower side wall 1 is assembled with the upper side wall 1, and the lower side wall 2 is assembled with the upper side wall 2. The upper side wall 2 is assembled with each other, and the lower side wall 2 is assembled with each other. Then, the longitudinal prestressing tendons are tensioned between each segment to complete the construction of the connection structure between the components of the concrete U-shaped subgrade. The present invention gives full play to the advantages of the prefabricated and assembled construction method, such as green environmental protection, less construction interference, and fast speed, overcomes the deficiencies existing in the prior art, and meets the requirements of reliable force, good integrity, and efficient assembly.

Description

Technical Field

[0001] The present invention relates to the field of subgrade structure construction, and particularly to a concrete U-shaped subgrade connection structure and a construction method thereof. Background Art

[0002] The U-shaped subgrade structure is widely used in railways, urban rail transit and municipal engineering. There are often long sections of U-shaped subgrades at both ends of the tunnels in high-speed rail projects. The traditional U-shaped subgrade adopts a reinforced concrete structure and is constructed by the in-situ casting method, which has problems such as a long construction period, low efficiency of steel bar binding, and a large number of support formworks. The prefabricated and assembled U-shaped subgrade changes the traditional construction method and adopts component prefabrication and rapid on-site installation. In recent years, related research and engineering applications have been increasing.

[0003] The cross-sectional dimensions of the U-shaped subgrade structure of high-speed rail or urban rail are large. The prefabricated and assembled construction requires dividing the structure into multiple prefabricated components, and the prefabricated components need to be assembled on-site. Its connection structure is the core and key. The connection structure should not only meet the overall stress requirements, but also have good waterproof effects, and more importantly, meet the high requirements of high-speed railways for settlement and line smoothness. At the same time, it should achieve rapid assembly and ensure high efficiency of on-site assembly. Therefore, it is an urgent problem to be studied and solved to invent a connection structure that meets the above requirements. Summary of the Invention

[0004] In view of this, the present invention aims to propose a concrete U-shaped subgrade connection structure and a construction method thereof, giving play to the advantages of the prefabricated and assembled construction method such as green environmental protection, less construction interference and fast speed, overcoming the deficiencies of the existing technology, and meeting the requirements of reliable stress, good integrity and high assembly efficiency.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A concrete U-shaped subgrade connection structure includes a plurality of bottom plates, a plurality of lower side walls one, a plurality of lower side walls two, a plurality of upper side walls one and a plurality of upper side walls two. The bottom plates are assembled with the lower side walls one and the lower side walls two, the lower side walls one are assembled with the upper side walls one, and the lower side walls two are assembled with the upper side walls two. The upper side walls two are assembled with each other, and the lower side walls two are assembled with each other to form a concrete U-shaped subgrade connection structure.

[0007] Further, the bottom plates, the lower side walls one, the lower side walls two, the upper side walls one and the upper side walls two are prefabricated and processed in a factory and then transported to the site.

[0008] Further, longitudinal prestressing tendons are arranged between the bottom plates, the lower side walls one, the lower side walls two, the upper side walls one and the upper side walls two, and are tensioned and anchored longitudinally.

[0009] Furthermore, the bottom plate is arranged below the track slab, and its transverse dimension exceeds that of the track slab, ensuring that there is no splicing joint below the track slab, thereby guaranteeing the integral deformation of the structure below the track. The bottom plate is provided with bottom plate recesses at its four corners and sides. The bottom plate recesses are lower than the bottom plate in the height direction of the top and bottom surfaces of the bottom plate, forming a groove structure.

[0010] Furthermore, the first lower side wall includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate. At the position opposite to the bottom plate recess on the first lower side wall, there is a side wall recess, and at the top of the first lower side wall, there is a first lower side wall top plate. The second lower side wall includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate. At the position opposite to the bottom plate recess on the second lower side wall, there is a side wall recess, and at the top of the second lower side wall, there is a second lower side wall top plate. On the side of the second lower side wall, there is a second lower side wall vertical rib, and the second lower side wall vertical rib is connected to the second lower side wall top plate and the bottom horizontal plate to form an integral body.

[0011] Furthermore, at the bottom of the first upper side wall, there is a first upper side wall bottom plate. At the bottom of the second upper side wall, there is a second upper side wall bottom plate. On the side of the second upper side wall, there is a second upper side wall vertical rib, and the second upper side wall vertical rib is connected to the second upper side wall bottom plate to form an integral body.

[0012] Furthermore, at the top and bottom between the bottom plate recess and the side wall recess, there is a connecting steel plate. On the bottom plate recess and the side wall recess, there are bolt holes. On the connecting steel plate, there are bolt holes. Insert the connecting bolts into the bolt holes, fix the connecting bolts to complete the installation of the upper and lower connecting steel plates, and then construct a post-cast strip between the bottom plate recess and the side wall recess, and seal the connecting steel plate and the connecting bolts with concrete or mortar.

[0013] Furthermore, bolt holes are provided on the first lower side wall top plate and the first upper side wall bottom plate. Connect the first lower side wall top plate and the first upper side wall bottom plate through side wall bolts. When assembling, insert the side wall bolts, and then install the side wall bolt washers and tighten the side wall bolts to connect the two.

[0014] Furthermore, or embed side wall bolts in the first lower side wall top plate. When assembling, insert the side wall bolts into the bolt holes of the first upper side wall bottom plate, fix the bolts, and then construct the side wall bolt caulking to complete the connection between the two.

[0015] Furthermore, a number of bolt holes are provided on both the first upper side wall vertical rib and the first lower side wall vertical rib. After the adjacent first upper side wall vertical ribs / first lower side wall vertical ribs are spliced, insert the longitudinal bolts into the bolt holes for fixation to realize the assembly between the first upper side wall vertical ribs and between the first lower side wall vertical ribs.

[0016] Furthermore, upper side wall tenons are provided on the first upper side wall, and the tenons of two adjacent first upper side walls are arranged correspondingly and are aligned with each other during assembly. The cooperation of the two is ensured through the side wall tenons, enhancing the integrity between the first upper side walls; a waterproof pad is provided at the middle position of the side wall tenons to prevent water flow from entering the inner side from the outer side of the first upper side wall. At the same time, since the joints between the side wall tenons are non-linear joints, the waterproof performance of the splicing joint can be enhanced; tenon bolts are provided on the side wall tenons. After the side wall tenons are assembled, the side wall tenons are connected through the tenon bolts. On the one hand, the tenon bolts enhance the connection performance and shear resistance of the side wall tenons, and on the other hand, they can play a role in pressing the waterproof pad, enhancing the waterproof ability.

[0017] A construction method for a concrete U-shaped roadbed connection structure includes the following steps:

[0018] Step 1: After the bottom plate, the first lower side wall, the second lower side wall, the first upper side wall, and the second upper side wall are prefabricated and processed in the factory, they are transported to the site;

[0019] Step 2: Assemble and connect the bottom plate and the first lower side wall of each longitudinal ring through a connecting steel plate, and connect the first lower side wall and the first upper side wall of each ring through side wall bolts;

[0020] Step 3: Assemble and connect the bottom plate and the second lower side wall of each longitudinal ring through a connecting steel plate, and connect the second lower side wall and the second upper side wall of each ring through side wall bolts;

[0021] Step 4: Drag or slide each ring longitudinally to the designed position, and complete the connection between the vertical ribs of the upper side walls and between the vertical ribs of the lower side walls through longitudinal bolts;

[0022] Step 5: Tension and anchor the longitudinal prestressed tendons to conduct longitudinal connection among all components, and complete the construction of a concrete U-shaped roadbed connection structure.

[0023] Compared with the prior art, the concrete U-shaped roadbed connection structure and its construction method of the present invention have the following advantages:

[0024] 1. The bottom plate and the side wall are connected by a connecting steel plate, and the assembly is fast. The top and bottom flexural capacities of the plate members are provided by the upper and lower connecting steel plates, solving the problems of dense steel bars and difficult connection between the plate members; the connecting steel plate can be post-constructed after the components are in place, solving the problem that it is difficult to control the splicing accuracy brought by the assembly of multiple plate members.

[0025] 2. At a certain interval longitudinally, vertical ribs are provided on one side of the side wall, and then the vertical ribs are connected by bolts, enhancing the integrity between the longitudinal side walls, preventing uneven settlement between each ring. At the same time, the vertical ribs enhance the flexural capacity of the side wall and improve the ability of the side wall to resist external loads.

[0026] 3. The upper and lower side walls are connected by setting the top and bottom plates and bolts, which solves the problem of complex connection of the vertical structural steel bars of the side walls. At the same time, the top and bottom plates enhance the stability and bending resistance of the side walls.

[0027] 4. By not setting assembly joints on the bottom plate, the integrity of the structure under the track slab is ensured. Then, through the double connection of longitudinal prestressed tendons and longitudinal bolts longitudinally, the integrity of the U-shaped subgrade structure is ensured, meeting the high requirements of high-speed railways for settlement and line smoothness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 is the front view structural schematic diagram of the present invention;

[0030] Figure 2 is Figure 1 the sectional view taken along line 1-1 of

[0031] Figure 3 is the side view structural schematic diagram of the present invention;

[0032] Figure 4 is Figure 3 the sectional view taken along line 2-2 of

[0033] Figure 5 is Figure 3 the sectional view taken along line 3-3 of

[0034] Figure 6 is the connection structural schematic diagram of the bottom plate of the present invention;

[0035] Figure 7 is Figure 6 the sectional view taken along line 4-4 of

[0036] Figure 8-1 is the plan view of the bottom plate structure of the present invention, Figure 8-2 is the plan view of the structure of the first lower side wall of the present invention, Figure 8-3 is the plan view of the structure of the second lower side wall of the present invention;

[0037] Figure 9 is Figure 3 the sectional view taken along line 5-5 of

[0038] Description of the reference numerals:

[0039] 1. Bottom plate; 11. Bottom plate recess;

[0040] 2. First lower side wall; 21. Second lower side wall; 22. Side wall recess; 23. Vertical rib of the lower side wall; 24. Top plate of the lower side wall;

[0041] 3. Upper side wall 1; 31. Upper side wall 2; 32. Upper side wall bottom plate; 33. Upper side wall vertical rib; 34. Side wall mortise;

[0042] 4. Connecting steel plate; 41. Connecting bolts; 42. Post-casting strip;

[0043] 5. Side wall bolts; 51. Side wall bolt pads; 52. Side wall bolt caulking;

[0044] 6. Longitudinal bolts; 7. Longitudinal prestressed tendons; 8. Tenon bolts; 9. Waterproof pads DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] like Figure 1-9As shown in the figure, a concrete U-shaped subgrade connection structure and construction method include a bottom plate 1, a lower side wall 1-2, a lower side wall 2-21, an upper side wall 1-3, an upper side wall 2-31, a connecting steel plate 4, connecting bolts 4-1, side wall bolts 5, longitudinal bolts 6, longitudinal prestressed tendons 7, etc. The bottom plate 1, the lower side wall 1-2, the lower side wall 2-21, the upper side wall 1-3, and the upper side wall 2-31 are prefabricated and then transported to the site. The bottom plate 1 is assembled with the lower side wall 1-2 and the lower side wall 2-21 through the connecting steel plate 4 and the connecting bolts 4-1. The lower side wall 1-2 is assembled with the upper side wall 1-3, and the lower side wall 2-21 is assembled with the upper side wall 2-31 through the side wall bolts 5, etc. The upper side wall 2-31 is assembled with each other, and the lower side wall 2-21 is assembled with each other through the longitudinal bolts 6, etc. Then, the longitudinal prestressed tendons 7 are tensioned between each segment to complete the construction of the connection structure between the components of the concrete U-shaped subgrade. The adjacent bottom plates 1 are extruded together by tensioning the longitudinal prestressed tendons 7 between each segment along the line direction, playing a role in connecting the bottom plates.

[0050] As Figure 3 shown, the bottom plate 1, the lower side wall 1-2, the lower side wall 2-21, the upper side wall 1-3, and the upper side wall 2-31 are prefabricated and then transported to the site. The lower side wall 1-2 and the lower side wall 2-21 are arranged in a cycle in the order of the lower side wall 2-21, the lower side wall 1-2, and the lower side wall 2-21.

[0051] As Figure 8-1 , Figure 8-2 , Figure 8-3 shown, the bottom plate 1 is arranged below the track slab, and its transverse dimension exceeds the track slab, ensuring that there is no splicing joint below the track slab, thus ensuring the deformation integrity of the structure below the track. The bottom plate 1 is provided with bottom plate recesses 1-1 at the four corners and the sides. The bottom plate recesses 1-1 are lower than the bottom plate 1 in the height direction of the top and bottom surfaces of the bottom plate 1, forming a groove structure.

[0052] As Figure 5 shown, the lower side wall 1-2 includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate 1. Side wall recesses 2-2 are provided at the positions corresponding to the bottom plate recesses 1-1 on the lower side wall 1-2. A lower side wall top plate 2-4 is provided at the top of the lower side wall 1-2. The lower side wall 2-21 includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate 1. Side wall recesses 2-2 are provided at the positions corresponding to the bottom plate recesses 1-1 on the lower side wall 2-21. A lower side wall top plate 2-4 is provided at the top of the lower side wall 2-21. Lower side wall vertical ribs 2-3 are provided on the side of the lower side wall 2-21. The lower side wall vertical ribs 2-3 are connected to the lower side wall top plate 2-4 and the bottom horizontal plate to form an integral body.

[0053] As Figure 4As shown in the figure, at the bottom of the upper side wall 1-3, there is an upper side wall bottom plate 32; at the bottom of the upper side wall 2-31, there is an upper side wall bottom plate 32, and on the side of the upper side wall 2-31, there is an upper side wall vertical rib 33. The upper side wall vertical rib 33 and the upper side wall bottom plate 32 are connected to form an integral body.

[0054] As Figure 6 shown in the figure, at the top and bottom between the bottom plate concave block 11 and the side wall concave block 22, there is a connecting steel plate 4. On the bottom plate concave block 11 and the side wall concave block 22, there are bolt holes, and on the connecting steel plate 4, there are bolt holes. Insert the connecting bolt 41 into the bolt holes to fix the connecting bolt 41 to complete the installation of the upper and lower connecting steel plates 4. Then, construct a post-cast strip 42 between the bottom plate concave block 11 and the side wall concave block 22, and seal the connecting steel plate 4 and the connecting bolt 41 with concrete or mortar.

[0055] As Figure 1 shown in the figure, bolt holes are provided on the lower side wall top plate 24 and the upper side wall bottom plate 32. Connect the lower side wall top plate 24 and the upper side wall bottom plate 32 through the side wall bolt 5. When assembling, insert the side wall bolt 5, and then install the side wall bolt washer 51 and tighten the side wall bolt 5 to connect the two.

[0056] Or pre-embed the side wall bolt 5 in the lower side wall top plate 24. When assembling, insert the side wall bolt 5 into the bolt hole of the upper side wall bottom plate 32, fix the bolt, and then construct the side wall bolt caulking 52 to complete the connection between the two.

[0057] As Figure 3 shown in the figure, several bolt holes are provided on both the upper side wall vertical rib 33 and the lower side wall vertical rib 23. After splicing adjacent upper side wall vertical ribs 33 or lower side wall vertical ribs 23, insert the longitudinal bolt 6 into the bolt holes for fixation to realize the assembly between the upper side wall vertical ribs 33 and between the lower side wall vertical ribs 23.

[0058] As Figure 3 shown in the figure, arrange the longitudinal prestressed tendon 7 between the bottom plate 1, the lower side wall 1-2, the lower side wall 2-21, the upper side wall 1-3, and the upper side wall 2-31, and carry out tensioning and anchoring longitudinally.

[0059] As Figure 9As shown, in another embodiment, upper sidewall tenons 34 are provided on the upper sidewall one 3. The tenons 34 of two adjacent upper sidewalls one 3 are arranged correspondingly. When the two are assembled, they are aligned with each other, and the cooperation of the two is ensured by the sidewall tenons 34, enhancing the integrity between the upper sidewalls one 3; a waterproof pad 9 is provided at the middle position of the sidewall tenons 34 to prevent water flow from entering the inner side from the outer side of the upper sidewall one 3. At the same time, since the joints between the sidewall tenons 34 are non-linear joints, the waterproof performance of the splicing joint can be enhanced; tenon bolts 8 are provided on the sidewall tenons 34. After the sidewall tenons 34 are assembled, the sidewall tenons 34 are connected by the tenon bolts 8. On the one hand, the tenon bolts 8 enhance the connection performance and shear resistance of the sidewall tenons 34, and on the other hand, they can play a role in pressing the waterproof pad 9 to enhance the waterproof ability.

[0060] A construction method for a concrete U-shaped roadbed connection structure includes the following steps:

[0061] Step 1: The bottom plate 1, the lower sidewall one 2, the lower sidewall two 21, the upper sidewall one 3, and the upper sidewall two 31 are prefabricated and processed in a factory and then transported to the site.

[0062] Step 2: Assemble and connect the bottom plate 1 and the lower sidewall one 2 of each longitudinal ring through the connecting steel plate 4, and connect the lower sidewall one 2 and the upper sidewall one 3 of each ring through the sidewall bolt 5.

[0063] Step 3: Assemble and connect the bottom plate 1 and the lower sidewall two 21 of each longitudinal ring through the connecting steel plate 4, and connect the lower sidewall two 21 and the upper sidewall two 31 of each ring through the sidewall bolt 5.

[0064] Step 4: Drag or slide each ring longitudinally to the designed position, and complete the connection between the upper sidewall vertical ribs 33 and between the lower sidewall vertical ribs 23 through the longitudinal bolts 6.

[0065] Step 5: Tension and anchor the longitudinal prestressed tendons 7 to conduct longitudinal connection between all components, and complete the construction of a concrete U-shaped roadbed connection structure.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A concrete U-shaped roadbed connection structure, characterized in that: It includes several bottom plates, several lower side walls I, several lower side walls II, several upper side walls I and several upper side walls II. After the bottom plates, lower side walls I, lower side walls II, upper side walls I and upper side walls II are prefabricated and processed, they are transported to the site. The bottom plates are assembled with the lower side walls I and lower side walls II, and the lower side walls I are assembled with the upper side walls I, and the lower side walls II are assembled with the upper side walls II. The upper side walls II are assembled with each other, and the lower side walls II are assembled with each other to form a concrete U-shaped subgrade connection structure; The lower side walls I and lower side walls II are arranged in a cycle in the order of lower side wall II, lower side wall I, and lower side wall II; The lower side wall I includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate. At the position on the lower side wall I opposite to the bottom plate recess, there is a side wall recess. At the top of the lower side wall I, there is a lower side wall top plate; The lower side wall II includes a bottom horizontal plate and a side vertical plate. The bottom horizontal plate faces the bottom plate. At the position on the lower side wall II opposite to the bottom plate recess, there is a side wall recess. At the top of the lower side wall II, there is a lower side wall top plate. On the side of the lower side wall II, there is a lower side wall vertical rib. The lower side wall vertical rib is connected to the lower side wall top plate and the bottom horizontal plate to form an integral body; At the bottom of the upper side wall I, there is an upper side wall bottom plate; At the bottom of the upper side wall II, there is an upper side wall bottom plate. On the side of the upper side wall II, there is an upper side wall vertical rib. The upper side wall vertical rib is connected to the upper side wall bottom plate to form an integral body; Bolt holes are arranged on the lower side wall top plate and the upper side wall bottom plate. When assembling, side wall bolts are inserted, and then side wall bolt washers are installed and the side wall bolts are tightened to connect the lower side wall top plate and the upper side wall bottom plate; On both the upper side wall vertical ribs and the lower side wall vertical ribs, there are several bolt holes. After adjacent upper side wall vertical ribs / lower side wall vertical ribs are spliced, longitudinal bolts are inserted into the bolt holes for fixation to realize the assembly between the upper side wall vertical ribs and between the lower side wall vertical ribs.

2. The concrete U-shaped roadbed connection structure according to claim 1, characterized in that: Longitudinal prestressing tendons are arranged between the bottom plate, lower side walls I, lower side walls II, upper side walls I and upper side walls II, and are tensioned and anchored longitudinally.

3. The concrete U-shaped roadbed connection structure according to claim 1, characterized in that: The bottom plate is arranged below the track slab. The transverse dimension of the bottom plate is larger than that of the track slab. The bottom plate is provided with bottom plate recesses at the four corners and the sides. The bottom plate recesses are lower than the bottom plate in the height direction of the top and bottom surfaces of the bottom plate, forming a groove structure.

4. A concrete U-shaped roadbed connection structure according to claim 1, characterized in that: At the top and bottom between the bottom plate recess and the side wall recess, there is a connecting steel plate. Bolt holes are arranged on the bottom plate recess and the side wall recess, and bolt holes are arranged on the connecting steel plate. Connecting bolts are inserted into the bolt holes, and the connecting bolts are fixed to complete the installation of the upper and lower connecting steel plates. Then, a post-cast strip is constructed between the bottom plate recess and the side wall recess, and the connecting steel plate and the connecting bolts are sealed with concrete or mortar.

5. A concrete U-shaped roadbed connection structure according to claim 1, characterized in that: An upper side wall tenon is provided on the first upper side wall, and the tenons of two adjacent first upper side walls are arranged correspondingly. When the adjacent first upper side walls are assembled, they are aligned with each other, and the cooperation of the two is ensured through the side wall tenons, enhancing the integrity between the first upper side walls. A waterproof pad is provided at the middle position of the side wall tenon, and a tenon bolt is provided on the side wall tenon. After the side wall tenons are assembled, the side wall tenons are connected through the tenon bolts.

6. The construction method of the concrete U-shaped roadbed connection structure according to any one of claims 1-5, characterized in that It includes the following steps: Step 1: The bottom plate, the first lower side wall, the second lower side wall, the first upper side wall, and the second upper side wall are prefabricated in the factory and then transported to the site. Step 2: Assemble and connect the bottom plate and the first lower side wall of each longitudinal ring through connecting steel plates, and connect the first lower side wall and the first upper side wall of each ring through side wall bolts. Step 3: Assemble and connect the bottom plate and the second lower side wall of each longitudinal ring through connecting steel plates, and connect the second lower side wall and the second upper side wall of each ring through side wall bolts. Step 4: Drag or slide each ring longitudinally to the designed position, and complete the connection between the vertical ribs of the upper side walls and between the vertical ribs of the lower side walls through longitudinal bolts. Step 5: Tension and anchor the longitudinal prestressed tendons, conduct longitudinal connection between all components, and complete the construction of a concrete U-shaped subgrade connection structure.

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