Side wall connecting structure of fabricated underground structure and construction method of side wall connecting structure

Abstract

The invention relates to a side wall connecting structure of an assembly type underground structure and a construction method thereof.The side wall comprises a cast-in-place side wall, a prefabricated side wall and a bottom side wall, side wall longitudinal bars are arranged in the side wall, the prefabricated side wall is provided with profile steel and profile steel connecting steel plates which are connected, and the profile steel connecting steel plates are connected with the side wall longitudinal bars in a welded mode; the profile steel is arranged at the bottom end of the prefabricated side wall, stress of the side wall longitudinal bars is transmitted to the profile steel through the steel connecting steel plates, the profile steel cup sleeves are arranged on the lower portion of the prefabricated side wall and matched with the profile steel in an inserted mode, and the bottom side wall is connected with the prefabricated side wall through the profile steel cup sleeves. The overall safety performance of the fabricated underground structure is improved, the mechanical property of the connecting joint of the side wall and the bottom plate is enhanced, and the fault tolerance performance and the engineering quality of side wall connection are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground engineering, and in particular relates to a side wall connection structure of an assembled underground structure and a construction method thereof. Background Art

[0002] In recent years, with the acceleration of urbanization, the demand for the development and utilization of underground space has continued to increase, and underground structures including underground stations, integrated pipe corridors and underground complexes have been widely used. However, the current underground structure construction is still mainly cast-in-place, and its construction process is complicated and relies on a large number of on-site operations, resulting in low construction efficiency. At the same time, the quality of cast-in-place construction is easily affected by the construction environment and operation level, and the quality of the project is difficult to guarantee. In addition, the underground construction working environment is often narrow and not conducive to ventilation, and the construction conditions are poor. In addition, the aging problem of construction workers is becoming increasingly prominent, which further increases the difficulty of construction organization.

[0003] Therefore, promoting the application and development of prefabricated underground structures has become an important way to solve the above-mentioned problems and has gradually become a consensus in the industry. Although the successful experience of prefabricated underground structures in the field of above-ground construction provides certain references, their application in underground structures is still in its infancy, especially the side wall and floor connection nodes of underground stations, which are subject to the greatest force. Their mechanical properties are directly related to the overall safety of the underground structure. At present, the side wall and floor connection technology of domestic prefabricated underground structures is not yet mature, and there are problems such as insufficient mechanical properties of node connections, low installation accuracy, and low construction efficiency. Therefore, designing and developing side wall and floor connection nodes with excellent mechanical properties, easy installation and construction, and adaptable to complex underground environments is an important direction in the research and development of prefabricated underground structures and a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a side wall connection structure of an assembled underground structure and a construction method thereof, so as to improve the overall safety performance of the assembled underground structure, enhance the mechanical properties of the connection node between the side wall and the base plate, and improve the fault tolerance performance and engineering quality of the side wall connection.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A side wall connection structure of an assembled underground structure, the side walls comprising cast-in-place side walls, prefabricated side walls and bottom side walls, side wall longitudinal reinforcements being arranged in the side walls, the prefabricated side walls being provided with connected steel sections and steel section connecting steel plates, the steel section connecting steel plates being connected to the side wall longitudinal reinforcements by welding, the steel sections being arranged at the bottom ends of the prefabricated side walls, the force of the side wall longitudinal reinforcements being transmitted to the steel sections via the steel section connecting steel plates, a steel section cup sleeve being arranged at the lower portion of the prefabricated side walls, the steel section cup sleeve being plug-fitted with the steel section, and the bottom side wall being connected to the prefabricated side wall via the steel section cup sleeve.

[0007] Preferably, side wall distribution ribs and side wall additional ribs are provided in the side wall.

[0008] Preferably, it comprises steel stirrups and steel anchor bars to reinforce the concrete portion at the connection between the steel and the prefabricated side wall.

[0009] Preferably, stirrups for connecting the steel plates are provided at the steel plates to prevent the steel plates from twisting and increase stability.

[0010] Preferably, a steel cup connecting steel plate and structural reinforcement are also provided at the lower portion of the prefabricated side wall, and the steel cup and the steel cup connecting steel plate are connected by welding to form a steel cup cavity together.

[0011] Preferably, the steel cup connection steel plate is connected to the side wall longitudinal reinforcement by welding, so as to transmit the force of the node to the side wall longitudinal reinforcement of the bottom side wall.

[0012] Preferably, stirrups for connecting the steel cup to the steel plate are tied at the steel cup to increase the stability of the steel cup connected to the steel plate and prevent the steel cup connected to the steel plate from twisting.

[0013] Preferably, the steel cup sleeve is provided with a steel cup sleeve anchor bar for strengthening the connection strength of the steel cup sleeve.

[0014] Preferably, a cushion layer is arranged between the prefabricated side wall and the bottom side wall to provide support and buffer.

[0015] On the other hand, the present invention also discloses a construction method of the side wall connection structure based on the above-mentioned assembled underground structure, comprising the following steps:

[0016] S1, connect the steel and the steel connecting steel plate, weld the side wall longitudinal reinforcement and the steel connecting steel plate, and tie the steel connecting steel plate stirrups at the steel connecting steel plate;

[0017] S2, welding steel anchor bars on the web of the steel, tying steel stirrups, placing the steel and its reinforcement into the formwork, pouring concrete and curing, and completing the prefabricated side wall;

[0018] S3, welding the steel cup sleeve to the steel cup sleeve connecting steel plate, and welding the side wall longitudinal reinforcement to the steel cup sleeve connecting steel plate;

[0019] S4, welding the steel cup anchor bar to the web of the steel cup, placing the steel cup and its reinforcement into the formwork, pouring concrete and curing, and completing the bottom side wall;

[0020] S5, grouting is performed in the cavity of the steel cup sleeve, and the steel of the prefabricated side wall is inserted into the steel cup sleeve. After the grouting material initially sets, the connection between the prefabricated side wall and the bottom side wall is completed. After the grouting material in the steel cup sleeve reaches a certain strength, the casting and curing of the cast-in-place side wall is completed.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The present invention adopts a reasonable side wall connection structure. By designing the coordination of steel sections, steel cup sleeves, steel connection steel plates, and steel cup sleeve connection steel plates, effective connection and force transmission are achieved between the side wall longitudinal reinforcement and the steel sections and steel cup sleeves. By setting structural reinforcement measures such as steel stirrups and anchor bars, the connection strength between the steel sections and the concrete part is significantly increased, ensuring that the mechanical properties of the steel sections in the nodes are fully utilized, thereby improving the overall mechanical properties and structural stability of the side wall connection. The steel cup sleeve of the present invention is cleverly designed, and the steel section can be installed by inserting the cup sleeve without complicated positioning and adjustment, which greatly improves the installation fault tolerance and strong adaptability. The node structure design is concise and clear, the construction process is efficient and convenient, and can significantly shorten the construction period, reduce construction errors, and improve the quality of the project. The present invention solves the problems of complicated traditional cast-in-place construction procedures and insufficient mechanical properties of connection nodes, and provides reliable technical support for the promotion of prefabricated underground structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the side wall node connection (with profiled steel) of the present invention;

[0024] Figure 2 It is a schematic diagram of the side wall node connection (with connecting steel plates) of the present invention;

[0025] Figure 3 It is a schematic diagram of the steel connecting stirrups and anchor bars of the present invention;

[0026] Figure 4 This is a schematic diagram of connecting the steel section with the steel plate stirrups of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection of the steel cup anchor bar of the present invention;

[0028] Figure 6 This is a schematic diagram of the connection between the steel cup sleeve and the steel plate stirrup of the present invention.

[0029] Figure markings: 1-cast-in-place side wall; 2-precast side wall; 3-side wall longitudinal reinforcement; 4-side wall distribution reinforcement; 5-side wall additional reinforcement; 6-steel; 7-steel cup sleeve; 8-steel connecting steel plate stirrups; 9-steel stirrups; 10-steel anchor bars; 11-steel cup sleeve connecting steel plate stirrups; 12-structural reinforcement; 13-steel connecting steel plates; 14-steel cup sleeve connecting steel plates; 15-steel cup sleeve anchor bars; 16-cushion; 17-bottom side wall. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the present invention.

[0031] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0032] like Figure 1-6 As shown, this embodiment discloses a side wall connection structure of an assembled underground structure, wherein the side wall comprises a cast-in-place side wall 1, a prefabricated side wall 2 and a bottom side wall 17, and a side wall longitudinal reinforcement 3 is arranged inside the side wall. The cast-in-place side wall 1 is a structure formed by pouring concrete on site, which is used to achieve an overall connection and sealing effect, and provide the ultimate strength and integrity of the side wall. The prefabricated side wall 2 is a prefabricated component, and its surface quality and dimensional accuracy can be guaranteed through standardized production, and at the same time, it can significantly shorten the on-site construction time.

[0033] The prefabricated side wall 2 is provided with connected steel sections 6 and steel section connection steel plates 13. The steel section 6 is the core force-bearing component of the prefabricated side wall 2, and is welded to the side wall longitudinal reinforcement 3 through the steel section connection steel plates 13, forming a reliable force transmission path. The welding connection method ensures that the force of the side wall longitudinal reinforcement 3 can be efficiently transmitted to the steel section 6, while increasing the stability of the node.

[0034] The steel section 6 is arranged at the bottom of the prefabricated side wall 2. This arrangement is conducive to transferring the load of the upper prefabricated side wall 2 to the bottom side wall 17 through the steel section 6, reducing the structural damage that may be caused by the mismatch of stiffness. The force of the side wall longitudinal reinforcement 3 is transferred to the steel section 6 through the steel connection steel plate 13. This force transfer path is optimized and can effectively reduce the stress concentration at the node connection, thereby improving the overall mechanical properties of the structure.

[0035] The lower part of the prefabricated side wall 2 is provided with a steel cup 7, the main function of which is to provide a plug-in position for the steel 6 and form a preliminary structural positioning. The steel cup 7 is plugged into the steel 6, and the plug-in depth is strictly calculated to ensure the connection strength and construction fault tolerance. After the steel is inserted into the steel cup 7, the preliminary connection is completed. This design significantly improves the convenience of construction and reduces the influence of positioning errors on the structural connection.

[0036] The bottom side wall 17 is connected to the prefabricated side wall 2 through the steel cup sleeve 7. The steel cup sleeve 7 not only provides a mechanical connection between the prefabricated side wall 2 and the bottom side wall 17, but also further enhances the stability of the node by pouring grouting materials after the construction is completed. After the grouting material fills the cavity of the steel cup sleeve 7, it can effectively avoid stress concentration caused by the gap in the node area, ensuring the durability and safety of the connection. This design scheme realizes efficient coordination of various parts of the side wall and improves the overall safety performance and construction efficiency of the prefabricated underground structure.

[0037] Furthermore, the side wall is provided with side wall distribution reinforcement 4 and side wall additional reinforcement 5. The main function of the side wall distribution reinforcement 4 is to enhance the shear resistance of the side wall. The evenly distributed reinforcement can effectively resist the shear failure of the side wall when it is subjected to stress. The side wall additional reinforcement 5 is used to further enhance the local bending and shear resistance of the key area. This arrangement can significantly improve the overall bearing capacity of the side wall under complex stress conditions, while ensuring the mechanical stability of the node area.

[0038] In this embodiment, the connection between the steel section 6 and the prefabricated side wall 2 also includes steel stirrups 9 and steel anchor bars 10, which are used to strengthen the concrete part of the connection between the steel section 6 and the prefabricated side wall 2, reduce the stiffness mutation between the steel section 6 and the concrete prefabricated side wall 2, and avoid cracks at the connection between the prefabricated side wall 2 and the steel section 6. The steel connection steel plate 13 is provided with steel connection steel plate stirrups 8, and the function of the steel connection steel plate stirrups 8 is to prevent the steel connection steel plate 13 from twisting under stress. The steel connection steel plate 13 is a key component for realizing the force transmission between the side wall longitudinal reinforcement 3 and the steel section 6. By providing the steel connection steel plate stirrups 8, the deformation or instability of the connection steel plate 13 due to torque can be effectively avoided, thereby improving the mechanical stability and reliability of the node area.

[0039] Furthermore, the lower part of the prefabricated side wall 2 is also provided with a steel cup connection steel plate 14 and structural reinforcement 12. The steel cup connection steel plate 14 is a key component used to connect the steel cup 7 with other structural members. It is firmly connected with the steel cup 7 by welding, which further enhances the mechanical properties of the connection node. The structural reinforcement 12 is distributed in the connection area of ​​the steel cup 7. Through reasonable arrangement, it effectively constrains the concrete and improves the overall stability of the connection node. The steel cup 7 and the steel cup connection steel plate 14 are connected by welding to form a steel cup cavity. The design of the steel cup cavity provides space for subsequent grouting. The cavity can form a tight mechanical connection after grouting, effectively avoiding gaps or looseness in the connection area, thereby improving the strength and durability of the node.

[0040] The steel cup connection steel plate 14 is connected to the side wall longitudinal reinforcement 3 by welding. This connection method ensures that the force of the node can be efficiently transmitted to the side wall longitudinal reinforcement 3 of the bottom side wall 17. This force transmission path is optimized so that the load of the upper prefabricated side wall 2 can be evenly distributed to the bottom side wall 17, improving the seismic performance and bearing capacity of the overall structure. The steel cup connection steel plate stirrups 11 are tied at the steel cup 7 to increase the stability of the steel cup connection steel plate 14 and prevent the steel cup connection steel plate 14 from twisting during construction or force application. The steel cup connection steel plate stirrups 11 further improve the shear resistance and structural safety of the connection node by effectively constraining the steel plate.

[0041] The steel cup sleeve 7 is provided with a steel cup sleeve anchor bar 15, which is fixed to the steel cup sleeve 7 by welding to strengthen the connection strength of the steel cup sleeve 7. The steel cup sleeve anchor bar 15 forms an anchoring structure with the concrete, which can significantly improve the pull-out resistance of the steel cup sleeve 7, ensure that it remains stable during long-term use, and avoid loosening or falling off due to external force.

[0042] A cushion layer 16 is provided between the prefabricated side wall 2 and the bottom side wall 17 to provide support and buffering. The cushion layer 16 is usually made of high-strength concrete or other materials with buffering properties. The main function of the cushion layer 16 is to disperse the load of the prefabricated side wall 2, to prevent the load from directly acting on the bottom side wall 17 and causing local stress concentration, thereby effectively protecting the structural integrity of the bottom side wall 17. In addition, the cushion layer 16 can provide a certain deformation capacity when subjected to force. This buffering characteristic can absorb the displacement difference caused by the settlement of the underground structure or temperature changes, reduce the deformation influence of the node area, and improve the durability and overall stability of the node.

[0043] In another embodiment, the present invention further discloses a construction method of the side wall connection structure based on the above-mentioned assembled underground structure, comprising the following steps:

[0044] S1, the steel section 6 is connected to the steel section connecting steel plate 13, and the side wall longitudinal reinforcement 3 is welded to the steel section connecting steel plate 13, and the steel section connecting steel plate stirrups 8 are tied at the steel section connecting steel plate 13.

[0045] In this step, the steel connecting plate 13 is reliably connected to the steel 6 and the side wall longitudinal reinforcement 3 by welding, so that the force can be effectively transmitted to the steel 6. The purpose of tying the steel connecting plate stirrups 8 is to enhance the stability of the steel connecting plate 13, prevent it from twisting during the force process, and ensure the mechanical properties and structural reliability of the entire node.

[0046] S2, weld the steel anchor bars 10 on the web of the steel section 6, tie the steel stirrups 9, put the steel section 6 and its reinforcement into the formwork, pour concrete and maintain, and complete the prefabricated side wall 2.

[0047] In this step, the steel anchor bar 10 is fixed to the web of the steel 6 by welding, forming an anchoring structure with the concrete, which significantly enhances the bonding force between the steel 6 and the concrete. The steel stirrups 9 effectively limit the cracks caused by the volume change of the concrete during the hardening process, thereby improving the durability and structural performance of the node area.

[0048] S3, welding the steel cup sleeve 7 to the steel cup sleeve connecting steel plate 14, and welding the side wall longitudinal reinforcement 3 to the steel cup sleeve connecting steel plate 14.

[0049] In this step, the steel cup connecting steel plate 14 is used as a key connecting component, which is welded to the steel cup 7 to form a whole, and is welded to the side wall longitudinal reinforcement 3. This mechanical path design ensures the reliability of the node force and facilitates the subsequent construction process.

[0050] S4, weld the steel cup anchor 15 to the web of the steel cup 7, place the steel cup 7 and its reinforcement into the formwork, pour concrete and maintain, and complete the bottom side wall 17.

[0051] In this step, the steel cup anchor 15 is fixed by welding, and together with the concrete forms a strong anchoring system, further enhancing the pull-out resistance of the steel cup 7. After the bottom side wall 17 is poured, the initial mechanical connection of the node area is guaranteed, providing a stable foundation for subsequent construction.

[0052] S5, grouting is performed in the cavity of the steel cup sleeve 7, and the steel section 6 of the prefabricated side wall 2 is inserted into the steel cup sleeve 7. After the grouting material is initially set, the connection between the prefabricated side wall 2 and the bottom side wall 17 is completed. After the grouting material in the steel cup sleeve 7 reaches a certain strength, the casting and curing of the cast-in-place side wall 1 is completed.

[0053] In this step, the cavity design of the steel cup sleeve 7 allows the grouting material to completely fill its interior, forming a high-strength connection node. After the grouting material reaches the designed strength, the pouring of the cast-in-place side wall 1 can effectively close the node area and ensure the rigidity and mechanical properties of the overall structure of the side wall. The entire construction process improves construction efficiency and project quality by optimizing the connection design and construction methods, while reducing the impact of construction errors on node safety.

[0054] In summary, the present invention discloses a side wall connection structure of an assembled underground structure and a construction method thereof. By setting a three-part structure of a cast-in-place side wall, a prefabricated side wall and a bottom side wall, and introducing key components such as steel sections, steel cup sleeves and steel connection steel plates, the force transmission path optimization of the side wall longitudinal reinforcement and efficient node connection are achieved. The steel section can be partially inserted into the steel cup sleeve to complete the installation, without the need for complex positioning and adjustment, and has good installation tolerance, which significantly improves the construction efficiency. Strengthening measures such as stirrups, anchor bars and structural reinforcement ensure a close connection between the steel section and the concrete, and improve the shear, tensile and torsion resistance of the node. The construction method further enhances the stability and mechanical properties of the node connection through welding and grouting technology.

[0055] The reasonable structural design of the present invention enables the side wall connection node to have excellent mechanical properties, can effectively withstand complex underground loads, and improve the safety and durability of the overall structure. At the same time, the steel cup cavity design and grouting process ensure the tightness and long-term stability of the node, avoiding loosening or cracking problems caused by construction errors or long-term use. The node structure design is clear and definite, and the construction and installation process is convenient and efficient, which not only shortens the project cycle, but also significantly improves the construction quality. The present invention provides an efficient and safe solution for the promotion and application of prefabricated underground structures, overcoming the problems of cumbersome traditional cast-in-place construction process and difficult to ensure construction quality. Especially in underground stations, integrated pipe corridors and other complex underground structures, the technical solution and construction method of the present invention provide reliable technical support for the engineering application of prefabricated structures with excellent mechanical properties and construction convenience, have broad application prospects, and promote the comprehensive development of prefabricated technology in the field of underground engineering.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A side wall connection structure of an assembled underground structure, characterized in that: The side wall comprises a cast-in-place side wall (1), a prefabricated side wall (2) and a bottom side wall (17); side wall longitudinal reinforcements (3) are arranged in the side wall; the prefabricated side wall (2) is provided with connected steel sections (6) and steel section connecting steel plates (13); the steel section connecting steel plates (13) are connected to the side wall longitudinal reinforcements (3) by welding; the steel section (6) is arranged at the bottom end of the prefabricated side wall (2); the force of the side wall longitudinal reinforcements (3) is transmitted to the steel section (6) through the steel section connecting steel plates (13); a steel section cup sleeve (7) is arranged at the bottom of the prefabricated side wall (2); the steel section cup sleeve (7) is plug-fitted with the steel section (6); and the bottom side wall (17) is connected to the prefabricated side wall (2) through the steel section cup sleeve (7).

2. The side wall connection structure of the assembled underground structure according to claim 1, characterized in that: Side wall distribution ribs (4) and side wall additional ribs (5) are arranged in the side wall.

3. The side wall connection structure of the assembled underground structure according to claim 1 or 2, characterized in that: It comprises steel stirrups (9) and steel anchor bars (10) for reinforcing the concrete portion at the connection between the steel (6) and the prefabricated side wall (2).

4. The side wall connection structure of the assembled underground structure according to claim 3, characterized in that: The section steel connecting steel plates (13) are provided with section steel connecting steel plate stirrups (8) to prevent the section steel connecting steel plates (13) from twisting and to increase stability.

5. The side wall connection structure of the assembled underground structure according to claim 4, characterized in that: The lower part of the prefabricated side wall (2) is also provided with a steel cup connecting steel plate (14) and structural reinforcement (12); the steel cup (7) and the steel cup connecting steel plate (14) are connected by welding to form a steel cup cavity.

6. The side wall connection structure of the assembled underground structure according to claim 5, characterized in that: The steel cup connection steel plate (14) is connected to the side wall longitudinal reinforcement (3) by welding, so as to transmit the force of the node to the side wall longitudinal reinforcement (3) of the bottom side wall (17).

7. The side wall connection structure of the assembled underground structure according to claim 6, characterized in that: A steel cup connecting steel plate stirrup (11) is tied at the steel cup (7) to increase the stability of the steel cup connecting steel plate (14) and prevent the steel cup connecting steel plate (14) from twisting.

8. The side wall connection structure of the assembled underground structure according to claim 7, characterized in that: The profiled steel cup sleeve (7) is provided with a profiled steel cup sleeve anchor bar (15) for strengthening the connection strength of the profiled steel cup sleeve (7).

9. The side wall connection structure of the assembled underground structure according to claim 8, characterized in that: A cushion layer (16) is arranged between the prefabricated side wall (2) and the bottom side wall (17) to provide support and cushioning.

10. A construction method for the side wall connection structure of the assembled underground structure according to claim 9, characterized in that: The following steps are involved: S1, connecting the steel section (6) with the steel section connecting steel plate (13), welding the side wall longitudinal reinforcement (3) with the steel section connecting steel plate (13), and tying the steel section connecting steel plate stirrups (8) at the steel section connecting steel plate (13); S2, welding the steel anchor bars (10) on the web of the steel (6), tying the steel stirrups (9), placing the steel (6) and its reinforcement into the formwork, pouring concrete and curing, and completing the prefabricated side wall (2); S3, welding the steel cup sleeve (7) to the steel cup sleeve connecting steel plate (14), and welding the side wall longitudinal reinforcement (3) to the steel cup sleeve connecting steel plate (14); S4, welding the steel cup anchor bar (15) to the web of the steel cup (7), placing the steel cup (7) and its reinforcement into the formwork, pouring concrete and curing, and completing the bottom side wall (17); S5, grouting is performed in the cavity of the steel cup sleeve (7), and the steel section (6) of the prefabricated side wall (2) is inserted into the steel cup sleeve (7). After the grouting material is initially set, the connection between the prefabricated side wall (2) and the bottom side wall (17) is completed. After the grouting material in the steel cup sleeve (7) reaches a certain strength, the casting and curing of the cast-in-place side wall (1) is completed.

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