High-impermeability fabricated underground diaphragm wall prefabricated part

Abstract

The utility model discloses an assembly type underground diaphragm wall prefabricated part with high impermeability. The geomembrane plate is embedded in the side, with the small width, of the concrete wall plate through the lock catches connected in a welded mode, the C-shaped embedded steel plate is embedded in a preset groove in the other side, with the large width, of the concrete wall plate, the impervious concrete wall plate units are spliced in a forward and reverse alternating mode to form a continuous assembly type underground diaphragm wall structure, and the ends of the two sides of the geomembrane plate are bent. A water stop strip is embedded in the connecting position of the geomembrane plate and the C-shaped embedded steel plate, and a center round hole used for reducing the self weight of the underground diaphragm wall prefabricated part is formed in the middle of the prefabricated concrete wall plate. The anti-seepage performance of the connecting position of the adjacent prefabricated parts is guaranteed, the anti-seepage performance of the whole structure of the underground diaphragm wall is remarkably improved, meanwhile, the underground diaphragm wall has the advantages of being large in rigidity and fast and convenient to construct, and is suitable for foundation pit supporting working conditions with the high underground water level, the large site transverse hydraulic gradient and the high anti-seepage requirement.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit engineering, and specifically relates to a prefabricated component of a prefabricated underground continuous wall with high impermeability. Background Technology

[0002] Diaphragm walls are currently the most commonly used retaining wall type in deep foundation pit engineering. They are typically constructed using on-site concrete casting. First, a trench is excavated using slurry for wall protection. A reinforcing cage is then placed within the trench, and underwater concrete is poured into the slurry using a tremie pipe method to form wall segments. These segments are then connected at joints to form a continuous underground reinforced concrete wall. Traditional cast-in-place diaphragm wall construction is inefficient. The long exposure time of the trench walls after excavation increases the risk of soil collapse and exposed reinforcement, leading to quality defects. Furthermore, traditional cast-in-place diaphragm walls require continuous construction. During the tremie pipe method of pouring underwater concrete for the initial sections, concrete flow around the joints can easily occur, causing quality defects such as mud inclusions at the joints. After excavation, these joints can easily become seepage channels, potentially leading to piping and other engineering accidents. Therefore, the overall seepage prevention performance of the diaphragm wall is a key factor affecting its overall safety, and the quality and seepage prevention performance of the joints are weak points in the overall structure's seepage prevention, requiring focused reinforcement. Utility Model Content

[0003] In order to solve the problems in the background art, the purpose of this utility model is to provide a prefabricated component for a prefabricated underground continuous wall with high impermeability.

[0004] The technical solution adopted in this utility model is as follows:

[0005] The prefabricated components of the assembled underground continuous wall are mainly composed of several impermeable concrete wall panel units connected in sequence. Each impermeable concrete wall panel unit adopts an integrated structure mainly composed of prefabricated concrete wall panels and impermeable components. The impermeable components include geomembrane panels and C-shaped embedded steel plates. The geomembrane panels and C-shaped embedded steel plates are respectively set on both sides of the prefabricated concrete wall panel along the thickness direction, and the axial directions of the geomembrane panels, C-shaped embedded steel plates and prefabricated concrete wall panels are parallel.

[0006] The precast concrete wall panel has a T-shaped cross-section. A C-shaped groove is provided on the wider side of the precast concrete wall panel. A C-shaped embedded steel plate is embedded in the C-shaped groove of the precast concrete wall panel. Waterstop strips are provided at both ends of the C-shaped embedded steel plate along the width direction. A geomembrane board is connected to the narrower side of the precast concrete wall panel. A C-shaped bend is provided at both ends of the geomembrane board along the width direction.

[0007] In the prefabricated components of the assembled underground continuous wall, each anti-seepage concrete wall panel unit is arranged alternately in front and back. The C-shaped bend of the geomembrane board in one anti-seepage concrete wall panel unit is inserted into the groove of the C-shaped embedded steel plate in another anti-seepage concrete wall panel unit adjacent to that anti-seepage concrete wall panel unit, thereby forming a continuous underground continuous wall structure.

[0008] The precast concrete wall panels are symmetrically arranged along their width direction. The thickness of the wider side of the precast concrete wall panel is the same as the thickness of the narrower side of the precast concrete wall panel. A central circular hole is provided in the middle of the precast concrete wall panel.

[0009] The geomembrane is made of high-density polyethylene film, and the thickness of the geomembrane is not less than 3mm.

[0010] The total width of the geomembrane panel is the same as the width of the precast concrete wall panel.

[0011] The geomembrane board is connected to the precast concrete wall panel by a locking buckle. One side of the locking buckle is welded to the geomembrane board, and the other side of the locking buckle is embedded in the precast concrete wall panel.

[0012] The locking mechanism adopts an E-type or I-type structure, and each waterproof concrete wall panel unit has no less than 2 locking mechanisms. The interval between two adjacent locking mechanisms is no greater than half the width of the smaller side of the precast concrete wall panel.

[0013] The waterstop strip 6 is made of water-absorbing materials such as natural rubber, chloroprene rubber, styrene-butadiene rubber, nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, water-soluble polyurethane prepolymer, and sodium acrylate superabsorbent polymer. Its volume expansion ratio in water should not be less than 250%.

[0014] In this prefabricated diaphragm wall component, a geomembrane panel is embedded in one side of a concrete wall panel via welded interlocking fasteners, while a C-shaped embedded steel plate is embedded in a pre-set groove on the other side of the concrete wall panel. The impermeable concrete wall panel units are alternately spliced ​​to form a continuous prefabricated diaphragm wall structure. The ends of the geomembrane panel are bent to fit into the grooves of the embedded steel plate. A waterstop strip is embedded at the connection between the geomembrane panel and the C-shaped embedded steel plate. This invention ensures the impermeability of the connection between adjacent prefabricated components, significantly improves the overall impermeability of the diaphragm wall structure, and also has the advantages of high rigidity and rapid construction. It is suitable for foundation pit support conditions with high groundwater levels, large lateral hydraulic gradients, and high impermeability requirements.

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

[0016] 1. The prefabricated components of the prefabricated underground continuous wall of this utility model are connected by mortise and tenon splicing to form an integral whole, eliminating the need for separate horizontal joints and improving the overall integrity of the prefabricated underground continuous wall.

[0017] 2. The underground continuous wall structure formed by this utility model has two layers of geomembrane boards and steel plates connected alternately to form a continuous seepage prevention layer, which significantly improves the overall seepage prevention performance of the underground continuous wall structure; the connection between adjacent precast components adopts C-shaped bends and grooves to extend the seepage path, and the channel is blocked with water-stop strips to ensure that the connection between precast components also has extremely high seepage prevention performance, which can solve the problem of water leakage in underground continuous walls. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-section of a single-panel prefabricated underground continuous wall component;

[0019] Figure 2 A schematic diagram showing the connection of multiple prefabricated components for a modular diaphragm wall;

[0020] Figure 3 This is a schematic diagram showing the dimensional relationships of prefabricated components for a single-panel prefabricated diaphragm wall.

[0021] In the diagram: 1-Precast concrete wall panel; 2-Central circular hole; 3-Geomembrane board; 4-C-shaped embedded steel plate; 5-Lock; 6-Waterstop strip. Detailed Implementation

[0022] The highly impermeable prefabricated diaphragm wall structure of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following embodiments are provided to help those skilled in the art further understand this utility model, and are not intended to limit it. Any modifications and changes made to this utility model within the spirit and scope of the claims fall within the protection scope of this utility model. Operations not specifically described in the embodiments are performed with reference to the methods already given in the utility model description, and will not be repeated here.

[0023] like Figure 1 As shown, the component is mainly composed of several impermeable concrete wall panel units connected in sequence. Each impermeable concrete wall panel unit adopts an integrated structure mainly composed of precast concrete wall panel 1 and impermeable components. The impermeable components include geomembrane board 3 and C-shaped embedded steel plate 4. The geomembrane board 3 and C-shaped embedded steel plate 4 are respectively arranged on both sides of the precast concrete wall panel 1 along the thickness direction. The geomembrane board 3, C-shaped embedded steel plate 4 and precast concrete wall panel 1 are parallel in axis.

[0024] The precast concrete wall panel 1 has a T-shaped cross-section and is symmetrical from left to right. A C-shaped groove is provided on the wider side of the precast concrete wall panel 1. A C-shaped embedded steel plate 4 is embedded in the C-shaped groove of the precast concrete wall panel 1. Waterstop strips 6 are provided at both ends of the C-shaped embedded steel plate 4 along the width direction. A geomembrane board 3 is connected to the narrower side of the precast concrete wall panel 1. A C-shaped bend is provided at both ends of the geomembrane board 3 along the width direction.

[0025] like Figure 2 As shown, in the prefabricated components of the assembled underground continuous wall, each anti-seepage concrete wall panel unit is arranged alternately in front and back. The C-shaped bend of the geomembrane board 3 in one anti-seepage concrete wall panel unit is inserted into the groove of the C-shaped embedded steel plate 4 in another anti-seepage concrete wall panel unit adjacent to this anti-seepage concrete wall panel unit, thereby forming a continuous underground continuous wall structure.

[0026] The precast concrete wall panel 1 is symmetrically arranged on the left and right sides along its own width direction. The thickness of the side with the larger width of the precast concrete wall panel 1 is the same as the thickness of the side with the smaller width of the precast concrete wall panel 1. A central circular hole 2 is provided in the middle of the precast concrete wall panel 1.

[0027] The geomembrane 3 is made of high-density polyethylene film, and the thickness of the geomembrane 3 is not less than 3mm.

[0028] The total width of the geomembrane panel 3 is the same as the width of the precast concrete wall panel 1.

[0029] The geomembrane 3 is connected to the precast concrete wall panel 1 by the locking buckle 5. One side of the locking buckle 5 is welded to the geomembrane 3, and the other side of the locking buckle 5 is embedded in the precast concrete wall panel 1.

[0030] The dimensional relationships of each part of the waterproof concrete wall panel unit are as follows: Figure 3 As shown. The precast concrete wall panel 1 has a T-shaped cross section that is symmetrical from left to right. The width of the precast concrete wall panel 1 should not be less than 1200mm and the thickness should not be less than 500mm. The commonly used width × thickness dimensions are: 1200mm × 600mm, 1500mm × 800mm, and 1800mm × 1000mm.

[0031] The thickness of the wider side and the narrower side of the precast concrete wall panel 1 is the same, and the width of the narrower side accounts for a proportion of 0.4 to 0.6 of the total width.

[0032] A central circular hole 2 is provided at the center of the cross-section of the precast concrete wall panel 1 to reduce the self-weight of the component. The diameter of the central circular hole 2 is usually 400-800mm. Considering the thickness of the concrete protective layer inside the wall panel, the distance from the edge of the central circular hole 22 to the upper and lower sides of the precast concrete wall panel 1 is not less than 80mm.

[0033] The geomembrane 3 is a high-density polyethylene film with a thickness of not less than 3 mm. The total width of the geomembrane 3 is the same as the width of the precast concrete wall panel 1, and the length of the bends at both ends should not be less than 100 mm.

[0034] The dimensions of the C-shaped groove are determined based on the length of the bend in the geomembrane, ensuring that the distance between the bend end of the geomembrane 3 and the inner walls of both ends of the groove is 10mm ± 2.5mm when the two are connected.

[0035] The material of the locking buckle 5 is high-density polyethylene, and the cross-sectional shape is usually E-shaped or I-shaped. The locking buckle 5 and the geomembrane board 3 should be connected by double-track hot-melt wedge welding. There should be no less than 2 locking buckles 5 on the anti-seepage concrete wall panel unit. The interval between two adjacent locking buckles 5 should not be greater than half the width of the smaller side of the precast concrete wall panel 1. The distance between the locking buckle 5 and the edge of the precast concrete wall panel 1 should not be less than 200mm.

[0036] The waterstop strip 6 is bonded to the C-shaped embedded steel plate 4. The waterstop strip 6 is usually made of water-absorbing materials such as natural rubber, chloroprene rubber, styrene-butadiene rubber, nitrile rubber, ethylene propylene diene monomer rubber, water-soluble polyurethane prepolymer, and sodium acrylate superabsorbent polymer. The volume expansion ratio in water should not be less than 250%.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A high impermeable assembled underground continuous wall prefabricated component, characterized in that: it is mainly composed of a plurality of impermeable concrete wall plate units connected in sequence, each of the impermeable concrete wall plate units adopts an integrated structure mainly composed of a prefabricated concrete wall plate (1) and an impermeable component, the impermeable component includes a geomembrane plate (3) and a C-shaped embedded steel plate (4), the geomembrane plate (3) and the C-shaped embedded steel plate (4) are respectively arranged on both sides of the prefabricated concrete wall plate (1) along the thickness direction, and the geomembrane plate (3), the C-shaped embedded steel plate (4) and the prefabricated concrete wall plate (1) are axially parallel. The prefabricated concrete wall plate (1) has a T-shaped cross section, a C-shaped groove is formed in the side with a larger width of the prefabricated concrete wall plate (1), the C-shaped embedded steel plate (4) is embedded in the C-shaped groove of the prefabricated concrete wall plate (1), a water stop strip (6) is arranged at each end of the C-shaped embedded steel plate (4) along the width direction, the geomembrane plate (3) is connected to the side with a smaller width of the prefabricated concrete wall plate (1), and the geomembrane plate (3) is provided with a C-shaped bending at each end along the width direction.

2. The high impermeable assembled diaphragm wall prefabricated member according to claim 1, characterized in that: In the assembled underground continuous wall prefabricated component, each of the impermeable concrete wall plate units is arranged alternately in positive and negative directions, the C-shaped bending of the geomembrane plate (3) in one impermeable concrete wall plate unit is clamped into the groove of the C-shaped embedded steel plate (4) in another impermeable concrete wall plate unit adjacent to the one impermeable concrete wall plate unit, thereby forming a continuous underground continuous wall structure.

3. The high impermeable assembled diaphragm wall prefabricated member according to claim 2, characterized in that: The prefabricated concrete wall plate (1) is symmetrically arranged along the width direction thereof, the thickness of the side with a larger width of the prefabricated concrete wall plate (1) is the same as the thickness of the side with a smaller width of the prefabricated concrete wall plate (1), and a central circular hole (2) is arranged in the middle of the prefabricated concrete wall plate (1).

4. The high impermeable assembled diaphragm wall prefabricated member according to claim 2, characterized in that: The geomembrane plate (3) is made of polyethylene film, and the thickness of the geomembrane plate (3) is not less than 3 mm.

5. The high impermeable assembled diaphragm wall prefabricated member according to claim 2, characterized in that: The total width of the geomembrane plate (3) is the same as the width of the prefabricated concrete wall plate (1).

6. The high impermeable assembled diaphragm wall prefabricated member according to claim 2, characterized in that: The geomembrane plate (3) is connected to the prefabricated concrete wall plate (1) through a lock buckle (5), one side of the lock buckle (5) is welded to the geomembrane plate (3), and the other side of the lock buckle (5) is embedded into the prefabricated concrete wall plate (1).

7. The high impermeable assembled diaphragm wall prefabricated member according to claim 2, characterized in that: The lock buckle (5) adopts an E-shaped or I-shaped structure, the number of the lock buckles (5) in each of the impermeable concrete wall plate units is not less than 2, and the interval between the adjacent two lock buckles (5) is not greater than half of the width of the side with a smaller width of the prefabricated concrete wall plate (1).

8. The high impermeable assembled diaphragm wall prefabricated member according to claim 7, characterized in that: ​

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