Prefabricated underground diaphragm wall spliced in three sections and used for underground two-layer station

Abstract

The utility model relates to a prefabricated underground diaphragm wall spliced in three sections for an underground two-layer station, which is divided into a plurality of prefabricated underground diaphragm wall units along the extension direction of the prefabricated underground diaphragm wall. Each underground diaphragm wall unit is divided into an upper prefabricated underground diaphragm wall section, a middle prefabricated underground diaphragm wall section and a lower prefabricated underground diaphragm wall section in the height direction, the upper prefabricated underground diaphragm wall section is connected to the upper portion of the middle prefabricated underground diaphragm wall section, and the lower prefabricated underground diaphragm wall section is connected to the lower portion of the middle prefabricated underground diaphragm wall section. The lower prefabricated underground diaphragm wall section is connected to the lower portion of the middle prefabricated underground diaphragm wall section, and the adjacent prefabricated underground diaphragm wall units are arranged in a staggered joint mode. The prefabricated underground wall section standard component has the advantages that the prefabricated underground wall section standard component of the underground two-layer station and a matched joint manufacturing method of the prefabricated underground wall section standard component are provided, and the prefabricated underground wall section standard component and the matched joint manufacturing method are suitable for factory-like large-scale production so as to improve social and economic benefits of prefabricated underground diaphragm wall technology application.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated underground continuous walls, in particular to a prefabricated underground continuous wall which is spliced ​​in three sections and is used for a second-floor underground station. Background Art

[0002] Currently, precast diaphragm walls are primarily used in underground projects with excavation depths of less than 10 meters. They are prefabricated in factories and hoisted on-site to provide foundation pit support. However, for excavation depths greater than 10 meters, such as the average excavation depth of approximately 17 meters at the second-level underground stations of Shanghai Metro, current precast diaphragm walls are often limited in transportation and hoisting capacity, making them ineffective. Summary of the Invention

[0003] The purpose of the present invention is to provide a prefabricated underground continuous wall which is divided into three sections and is used for underground two-story stations in accordance with the above-mentioned deficiencies of the existing technology. The invention adopts a construction method in which the wall sections are prefabricated in three sections, the wall sections are prefabricated in the factory, the sections are transported and hoisted in sections, and the sections are spliced ​​into trenches on site, thereby forming a prefabricated underground continuous wall technology that meets the use function of the enclosure structure of the underground two-story station.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A prefabricated underground continuous wall for use in a two-story underground station, characterized in that the prefabricated underground continuous wall is divided into a plurality of prefabricated underground continuous wall units along its extension direction, each of the prefabricated underground continuous wall units is divided into an upper prefabricated underground continuous wall segment, a middle prefabricated underground continuous wall segment, and a lower prefabricated underground continuous wall segment along its height direction, and adjacent prefabricated underground continuous wall units are arranged with staggered joints.

[0006] The upper prefabricated underground continuous wall segment is connected to the upper part of the middle prefabricated underground continuous wall segment, and the two are connected by a bolt joint;

[0007] The lower prefabricated underground continuous wall segment is connected below the middle prefabricated underground continuous wall segment, and the two are connected by a steel joint.

[0008] The bolt joint adopts a high-strength tension bolt, one end of the high-strength tension bolt is connected and fixed to the upper prefabricated underground continuous wall segment, and the other end is connected and fixed to the lower prefabricated underground continuous wall segment.

[0009] Embedded steel pipes are respectively embedded in the bottom of the upper prefabricated underground continuous wall segment and the top of the middle prefabricated underground continuous wall segment. The embedded steel pipes on both sides are butt-jointed and filled with high-strength non-shrinkage cement-based grouting material.

[0010] An inner sleeve is inserted into the embedded steel pipe, and both ends of the inner sleeve are respectively connected to the embedded steel pipes of the upper prefabricated underground continuous wall segment and the middle prefabricated underground continuous wall segment.

[0011] The steel section joint includes steel sections partially embedded in the bottom of the middle prefabricated underground continuous wall segment and the top of the lower prefabricated underground continuous wall segment, and the steel sections are connected and fixed.

[0012] The portion of the steel section embedded in the middle prefabricated underground continuous wall segment or the lower prefabricated underground continuous wall segment is provided with studs.

[0013] The advantages of the utility model are: proposing universal standard components of prefabricated underground wall sections for underground two-story stations and their matching joint methods, which are suitable for large-scale factory production to improve the social and economic benefits of the application of prefabricated underground continuous wall technology; bolt joints are used to connect the upper and middle prefabricated underground continuous wall sections, which is convenient for construction and improves construction efficiency; steel joints are used to connect the middle and lower prefabricated underground continuous wall sections to ensure the structural performance of the underground continuous wall; there is no need to pour wall section concrete underwater, and the wall sections can be continuously troughed and hoisted, which improves work efficiency, reduces the exposure time of the trough wall, and ensures the stability of the trough wall and the quality of the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the segmented structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the bolt connection structure between the upper section and the middle section of the utility model;

[0016] Figure 3 This is a schematic diagram of the steel connection structure between the middle section and the lower section in the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0018] like Figure 1-3 As shown in the figure, marks 1-9 and AB respectively represent: upper section prefabricated underground continuous wall segment 1, middle section prefabricated underground continuous wall segment 2, lower section prefabricated underground continuous wall segment 3, high-strength tension bolts 4, embedded steel pipes 5, high-strength non-shrinkage cement-based grouting material 6, steel sections 7, studs 8, inner sleeves 9; ground A, pit bottom B.

[0019] Example: Figures 1 to 3As shown, in this embodiment, the prefabricated underground continuous wall divided into three sections for the underground second-floor station adopts three-section prefabricated wall segments and designs different connection structures between the three prefabricated wall segments. Through the construction method of prefabricating wall segments in the factory, transporting and hoisting in sections, and splicing them into trenches on site, a prefabricated underground continuous wall technology that meets the use function of the underground second-floor station enclosure structure is formed, which is particularly suitable for underground projects with an excavation depth greater than 10m.

[0020] Specifically, if Figure 1 As shown, the prefabricated underground continuous wall in this embodiment is divided into several prefabricated underground continuous wall units along its extension direction, and each underground continuous wall unit is divided into an upper prefabricated underground continuous wall segment 1, a middle prefabricated underground continuous wall segment 2 and a lower prefabricated underground continuous wall segment 3 along the height direction, wherein the upper prefabricated underground continuous wall segment 1 is connected to the top of the middle prefabricated underground continuous wall segment 2, and the lower prefabricated underground continuous wall segment 3 is connected to the bottom 2 of the middle prefabricated underground continuous wall segment, and adjacent prefabricated underground continuous wall units are staggered to ensure the enclosure support effect and water-stopping effect.

[0021] like Figure 2 As shown, the upper prefabricated underground continuous wall segment 1 and the middle prefabricated underground continuous wall segment 2 are connected by bolt joints, so as to take advantage of the convenient installation of bolt joints, thereby enabling the upper prefabricated underground continuous wall segment 1 and the middle prefabricated underground continuous wall segment 2 to be quickly and simply connected.

[0022] In this embodiment, the bolted joints utilize high-strength tension bolts 4. The upper ends of these high-strength tension bolts 4 are fixedly connected to the upper prefabricated diaphragm wall segment 1, and the lower ends are fixedly connected to the lower prefabricated diaphragm wall segment 2, thereby connecting the upper and lower prefabricated diaphragm wall segments. During use, a number of high-strength tension bolts 4 are evenly spaced along the width of the prefabricated diaphragm wall segment 1 to ensure that the upper and lower prefabricated diaphragm wall segments are securely connected to form a single structure.

[0023] In this embodiment, in order to further improve the structural integrity and structural stability between the upper and lower prefabricated underground continuous wall segments, embedded steel pipes 5 are respectively buried at the bottom of the upper prefabricated underground continuous wall segment 1 and the top of the middle prefabricated underground continuous wall segment 2. The embedded steel pipes 5 on both sides are welded and connected through the inner sleeve 9, thereby connecting the upper and lower embedded steel pipes 5 into an integral structure, and further filling the interior of the embedded steel pipes 5 with high-strength non-shrinkage cement-based grouting material 6 to form a component that resists transverse shear force, ensuring that no horizontal displacement occurs between the upper and lower prefabricated underground continuous wall segments.

[0024] like Figure 3As shown, the middle prefabricated underground continuous wall segment 2 and the lower prefabricated underground continuous wall segment 3 are connected by steel joints, so as to take advantage of the good stress-bearing performance of the steel joints, thereby ensuring the overall stress-bearing performance of the prefabricated underground continuous wall.

[0025] The steel joint includes a steel section 7 partially embedded in the bottom of the middle prefabricated underground continuous wall segment 2 and the top of the lower prefabricated underground continuous wall segment 3. The steel sections 7 on both sides are connected and fixed by a connecting steel plate. The connecting steel plate spans the parts of the steel sections 7 on both sides and is connected or welded to the steel sections 7 on both sides by connecting parts. The portion of the steel section 7 embedded in the middle prefabricated underground continuous wall segment 2 or the lower prefabricated underground continuous wall segment 3 is provided with studs 8 to improve the connection performance between the steel section 7 and the prefabricated underground continuous wall segment 2, thereby improving the connection performance between the middle and lower prefabricated underground continuous wall segments, ensuring that the two are firmly connected to form an integral structure.

[0026] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described here one by one.

Claims

1. A prefabricated underground continuous wall for a two-story underground station, which is composed of three sections and is characterized by: The prefabricated underground continuous wall is divided into a plurality of prefabricated underground continuous wall units along its extension direction, and each of the prefabricated underground continuous wall units is divided into an upper prefabricated underground continuous wall segment, a middle prefabricated underground continuous wall segment and a lower prefabricated underground continuous wall segment along its height direction, and adjacent prefabricated underground continuous wall units are arranged in a staggered manner; The upper prefabricated underground continuous wall segment is connected above the middle prefabricated underground continuous wall segment, and the two are connected by a bolt joint; The lower prefabricated underground continuous wall segment is connected below the middle prefabricated underground continuous wall segment, and the two are connected by a steel joint.

2. The prefabricated underground continuous wall for a two-story underground station according to claim 1, characterized in that: The bolt joint adopts a high-strength tension bolt, one end of the high-strength tension bolt is connected and fixed to the upper prefabricated underground continuous wall segment, and the other end is connected and fixed to the lower prefabricated underground continuous wall segment.

3. The prefabricated underground continuous wall for a two-story underground station, which is spliced ​​in three sections, according to claim 1, is characterized in that: Embedded steel pipes are respectively embedded in the bottom of the upper prefabricated underground continuous wall segment and the top of the middle prefabricated underground continuous wall segment. The embedded steel pipes on both sides are butt-jointed and filled with high-strength non-shrinkage cement-based grouting material.

4. The prefabricated underground continuous wall for a two-story underground station according to claim 3, characterized in that: An inner sleeve is inserted into the embedded steel pipe, and both ends of the inner sleeve are respectively connected to the embedded steel pipes of the upper prefabricated underground continuous wall segment and the middle prefabricated underground continuous wall segment.

5. The prefabricated underground continuous wall for a two-story underground station, which is assembled in three sections, according to claim 1, is characterized in that: The steel section joint includes steel sections partially embedded in the bottom of the middle prefabricated underground continuous wall segment and the top of the lower prefabricated underground continuous wall segment, and the steel sections are connected and fixed.

6. The prefabricated underground continuous wall for a two-story underground station, which is assembled in three sections, according to claim 1, is characterized in that: The portion of the steel section embedded in the middle prefabricated underground continuous wall segment or the lower prefabricated underground continuous wall segment is provided with studs.

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