Novel assembly type underground diaphragm wall vertical joint structure

Abstract

The utility model discloses a novel assembly type underground diaphragm wall vertical joint structure which comprises a first wall body unit and a second wall body unit which are sequentially connected end to end, spliced, fixed and adjacent, and a first joint structure located on the upper middle portion and a second joint structure located on the lower middle portion are arranged between the first wall body unit and the second wall body unit. The first joint structure and the second joint structure achieve connection and waterproofness between the first wall body unit and the second wall body unit. When the prefabricated underground diaphragm wall is inserted for construction, the adjacent wall steel ribs are mutually tied and guided, so that the construction accuracy is improved, and the shear strength at the joint is ensured. After the insertion construction of the adjacent wall body units is completed, post-pouring UHPC concrete and steel floral tube grouting construction are carried out at the joints between the widths, the insertion construction of the subsequent underground diaphragm wall is not influenced, the construction efficiency is improved, the strength and waterproof effect of the joints are enhanced, and the application of the fabricated underground diaphragm wall in underground engineering is effectively promoted.

Description

Technical Field

[0001] This utility model belongs to the field of underground structure engineering technology, specifically relating to a novel prefabricated diaphragm wall vertical joint structure. Background Technology

[0002] With the continuous advancement of urban construction, the number of deep foundation pit projects is constantly increasing, especially those located in busy areas. Traditional cast-in-place diaphragm wall construction often occupies roads for extended periods, disrupting traffic, and suffers from low construction efficiency, difficulty in guaranteeing construction quality, and significant negative impacts on the surrounding environment. Precast diaphragm walls offer advantages such as standardized mass production, controllable quality, and rapid construction progress, meeting energy conservation and environmental protection requirements. However, the strength and waterproofing performance of precast diaphragm walls often depend on the joints between sections.

[0003] At present, the main methods used in engineering are to stop water leakage and increase the strength of the joint by pouring concrete and grouting at the joint. However, these methods are time-consuming and labor-intensive, and the results are difficult to control, which can easily lead to water leakage at the joint. Summary of the Invention

[0004] This utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a new type of prefabricated diaphragm wall vertical joint structure.

[0005] The technical solution of this utility model is: a novel prefabricated diaphragm wall vertical joint structure, including a first wall unit and a second wall unit that are connected and fixed to each other in sequence. A first joint structure located in the upper middle part and a second joint structure located in the lower middle part are provided between the first wall unit and the second wall unit. The first joint structure and the second joint structure realize the connection and waterproofing between the first wall unit and the second wall unit.

[0006] Furthermore, the second joint structure includes a first groove on the right side of the first wall unit and a second groove on the left side of the second wall unit, with the first groove and the second groove being laterally opposite each other.

[0007] Furthermore, the first groove and the second groove are joined together to form a casting cavity, which is a closed cavity in cross section.

[0008] Furthermore, the casting cavity is filled with UHPC concrete, which enables the connection and waterproofing of the lower parts of the first wall unit and the second wall unit.

[0009] Furthermore, the first joint structure is a rigid connection structure, which includes a supporting member in the first wall unit and an inserting member in the second wall unit, wherein the inserting member is inserted into the supporting member.

[0010] Furthermore, the supporting component is a first connecting steel component, and the cross-section of the first connecting steel component forms an opening.

[0011] Furthermore, the opening of the first connecting steel member is connected to the right side of the first wall unit.

[0012] Furthermore, the fitting includes a second connecting steel member protruding from the left side of the second wall unit, the second connecting steel member being able to pass through the opening of the first connecting steel member.

[0013] Furthermore, the free end of the second connecting steel member is provided with a steel perforated tube, which is disposed inside the first connecting steel member.

[0014] Furthermore, the outer diameter of the steel pipe is larger than the opening of the first connecting steel member.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model of prefabricated diaphragm wall improves construction accuracy and ensures shear strength at the joint by relying on the mutual connection and guidance of the steel reinforcement of adjacent wall sections during insertion construction.

[0017] After the adjacent wall units are inserted and constructed, the UHPC concrete and steel pipe grouting are carried out at the joint between the sections. This does not affect the insertion and construction of subsequent sections of the diaphragm wall, improves construction efficiency, enhances the strength and waterproofing effect of the joint, and can effectively promote the application of prefabricated diaphragm walls in underground engineering. Attached Figure Description

[0018] Figure 1 This is a top view of the present invention;

[0019] Figure 2 This is an enlarged schematic diagram of the present invention;

[0020] Figure 3 This is a cross-sectional view of the first connecting steel component in this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection of the second connecting steel component, the third connecting steel component, and the steel flower pipe in this utility model;

[0022] Figure 5 This is an assembly diagram of the first connecting steel component in this utility model;

[0023] in:

[0024] 1 First wall unit 2 Second wall unit

[0025] 3 First connecting steel component 4 Second connecting steel component

[0026] 5. Cement-based grout 6. Steel perforated pipe

[0027] 7 First groove 8 Second groove

[0028] 9 UHPC concrete 10 Third connecting steel component. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] like Figures 1 to 5 As shown, a prefabricated diaphragm wall vertical joint structure includes a first wall unit 1 and a second wall unit 2 that are connected and fixed to each other in sequence. A first joint structure located in the upper middle part and a second joint structure located in the lower middle part are provided between the first wall unit 1 and the second wall unit 2. The first joint structure and the second joint structure realize the connection and waterproofing between the first wall unit 1 and the second wall unit 2.

[0031] The second joint structure includes a first groove 7 on the right side of the first wall unit 1 and a second groove 8 formed on the left side of the second wall unit 2. The first groove 7 and the second groove 8 are laterally opposite each other.

[0032] The first groove 7 and the second groove 8 are joined together to form a casting cavity, which is a closed cavity.

[0033] The casting cavity is filled with UHPC concrete 9, which enables the connection and waterproofing of the lower part of the first wall unit 1 and the second wall unit 2.

[0034] The first joint structure is a rigid connection structure, which includes a supporting member in the first wall unit 1 and an inserting member in the second wall unit 2, wherein the inserting member is inserted into the supporting member.

[0035] The supporting component is a first connecting steel component 3, and the cross-section of the first connecting steel component 3 forms an opening.

[0036] The opening of the first connecting steel member 3 is connected to the right side of the first wall unit 1.

[0037] The fitting includes a second connecting steel member 4 protruding from the left side of the second wall unit 2, the second connecting steel member 4 being able to pass through the opening of the first connecting steel member 3.

[0038] The free end of the second connecting steel member 4 is provided with a steel perforated tube 6, which is located inside the first connecting steel member 3.

[0039] The outer diameter of the steel pipe 6 is larger than the opening of the first connecting steel member 3.

[0040] Specifically, the first groove 7 is an opening groove with an opening larger than the bottom of the groove, and the second groove 8 is also an opening groove with an opening larger than the bottom of the groove, and the openings of the first groove 7 and the second groove 8 are the same.

[0041] More specifically, the cross-section of the casting cavity formed by the first groove 7 and the second groove 8 is hexagonal.

[0042] Specifically, the cross-section of the first connecting steel member 3 is C-shaped, and the opening of the first connecting steel member 3 is slightly larger than that of the second connecting steel member 4.

[0043] More specifically, a parallel guide plate is provided at the opening of the first connecting steel member 3, and the free end of the parallel guide plate is aligned with the right side of the first wall unit 1.

[0044] Specifically, the second connecting steel member 4 is plate-shaped, and a steel perforated pipe 6 is provided at the free end of the second connecting steel member 4. The steel perforated pipe 6 is a hollow pipe, such as... Figure 2 As shown, the steel pipe 6 can be inserted into the first connecting steel member 3.

[0045] More specifically, the second wall unit 2 is also provided with a third connecting steel member 10, one side of which is connected to the second connecting steel member 4.

[0046] More specifically, the third connecting steel member 10 and the second connecting steel member 4 are vertically connected.

[0047] Specifically, the first groove 7 and the second groove 8 are joined together to form a casting cavity, and UHPC concrete 9 is poured into the casting cavity during construction.

[0048] Similarly, cement-based grout 5 is injected into the gap between the first connecting steel member 3 and the second connecting steel member 4, as well as into the gap between two adjacent wall units.

[0049] Specifically, the second connecting steel member 4 is formed by a tie part and a connecting part fixedly connected. The connecting part of the second connecting steel member 4 is embedded in the second wall unit 2 and fixedly connected to the third connecting steel member 10. The tie part of the second connecting steel member 4 extends into the first connecting steel member 3 and is nested in the first connecting steel member 3.

[0050] Specifically, the parallel guide plate consists of two parallel steel plates, and the steel perforated pipe 6 is inserted into the C-shaped space of the first connecting steel piece 1. During construction, cement-based grout 5 is injected into the steel perforated pipe 6.

[0051] Specifically, the first groove 7 and the second groove 8 extend along the entire height of the wall, and correspondingly, the first connecting steel member 3 and the second connecting steel member 4 also extend along the entire height of the wall.

[0052] As one implementation, UHPC concrete 9 is poured into the casting cavity formed by the first groove 7 and the second groove 8 to improve the waterproof performance and connection strength at the joint. The casting cavity extends downward from the top surface of the first wall unit 1 and the second wall unit 2, and can penetrate the entire wall.

[0053] The construction method of the underground diaphragm wall of this utility model is as follows:

[0054] Step 1: Precast reinforced concrete underground continuous wall unit. During precasting, the first connecting steel member 3, the second connecting steel member 4, and the third connecting steel member 10 are pre-embedded and fixed at the corresponding positions of the wall unit.

[0055] Step 2: Construction site enclosure, site leveling, and traffic diversion; trenching construction of underground continuous wall using mud slurry wall protection.

[0056] Step 3: Position and insert the first wall unit 1, temporarily fixing the first wall unit 1. Align the first groove 7 of the first wall unit 1 with the second groove 8 of the second wall unit 2. During this process, ensure that the steel flower tube 6 of the second connecting steel member 4 is inserted into the first connecting steel member 3 so that they are connected to each other, which serves as positioning and guiding functions.

[0057] Step 5: Continuously insert subsequent wall units along the direction of the underground continuous wall trench. During the insertion of subsequent wall units, pour UHPC concrete 9 into the casting cavity formed by the first groove 7 and the second groove 8 to improve the connection effect of adjacent wall units.

[0058] Step 6: Inject cement-based grout 5 into the steel pipe 6 at the joint between the first wall unit 1 and the second wall unit 2 to seal the joint between the wall units and achieve the purpose of waterproofing the joint.

[0059] Step 7: After constructing several sections of the diaphragm wall, inject cement grout 5 into the gaps between the precast wall units and the trench to replace the mud in the gaps and form an outer waterproof layer for the overall structure.

[0060] Step 8: Follow the above steps until the entire diaphragm wall construction is completed.

[0061] This utility model of prefabricated diaphragm wall improves construction accuracy and ensures shear strength at the joint by relying on the mutual connection and guidance of the steel reinforcement of adjacent wall sections during insertion construction.

[0062] After the adjacent wall units are inserted and constructed, the UHPC concrete and steel pipe grouting are carried out at the joint between the sections. This does not affect the insertion and construction of subsequent sections of the diaphragm wall, improves construction efficiency, enhances the strength and waterproofing effect of the joint, and can effectively promote the application of prefabricated diaphragm walls in underground engineering.

Claims

1. A novel prefabricated diaphragm wall vertical joint structure, comprising a first wall unit (1) and a second wall unit (2) that are sequentially connected and fixed to each other, characterized in that: The first wall unit (1) and the second wall unit (2) are provided with a first joint structure located in the upper middle part and a second joint structure located in the lower middle part. The first joint structure and the second joint structure realize the connection and waterproofing between the first wall unit (1) and the second wall unit (2).

2. The novel prefabricated diaphragm wall vertical joint structure according to claim 1, characterized in that: The second joint structure includes a first groove (7) on the right side of the first wall unit (1) and a second groove (8) formed on the left side of the second wall unit (2). The first groove (7) and the second groove (8) are laterally opposite to each other.

3. A novel prefabricated diaphragm wall vertical joint structure according to claim 2, characterized in that: The first groove (7) and the second groove (8) are joined together to form a casting cavity, which is a closed cavity.

4. A novel prefabricated diaphragm wall vertical joint structure according to claim 3, characterized in that: The casting cavity is filled with UHPC concrete (9), which enables the connection and waterproofing of the lower part of the first wall unit (1) and the second wall unit (2).

5. A novel prefabricated diaphragm wall vertical joint structure according to claim 1, characterized in that: The first joint structure is a rigid connection structure, which includes a support member in the first wall unit (1) and an insertion member in the second wall unit (2), wherein the insertion member is inserted into the support member.

6. A novel prefabricated diaphragm wall vertical joint structure according to claim 5, characterized in that: The supporting component is a first connecting steel component (3), and the cross-section of the first connecting steel component (3) forms an opening.

7. A novel prefabricated diaphragm wall vertical joint structure according to claim 6, characterized in that: The opening of the first connecting steel member (3) is connected to the right side of the first wall unit (1).

8. A novel prefabricated diaphragm wall vertical joint structure according to claim 7, characterized in that: The fitting includes a second connecting steel member (4) protruding from the left side of the second wall unit (2), the second connecting steel member (4) being able to pass through the opening of the first connecting steel member (3).

9. A novel prefabricated diaphragm wall vertical joint structure according to claim 8, characterized in that: The free end of the second connecting steel member (4) is provided with a steel flower tube (6), which is located inside the first connecting steel member (3).

10. A novel prefabricated diaphragm wall vertical joint structure according to claim 9, characterized in that: The outer diameter of the steel pipe (6) is larger than the opening of the first connecting steel member (3).

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