An integral cast-in-place diaphragm wall without joints and its construction method

Abstract

The present invention provides a jointless integral cast-in-place diaphragm wall, which includes a first grooving section, a connecting section, and a closing section dug by a grooving machine. A first-opening steel structure baffle is lowered into the first grooving section, a connecting-opening steel structure baffle is lowered into the connecting section, and a closing-opening steel structure baffle is lowered into the closing section. Concrete is uniformly poured within the overlapping sealing area, and after solidification, a jointless and integrally excellent diaphragm wall is formed. The structural design is scientific and reasonable. The method of jointless integral casting is adopted, without construction cold joints, with excellent overall stability, and is a jointless design, avoiding the risk of water leakage at the joints from the source, having good anti-seepage performance, and being convenient for construction, providing a new idea for the construction of diaphragm walls.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a jointless integral cast-in-place diaphragm wall and a construction method thereof. Background Art

[0002] A diaphragm wall is a foundation project that uses a grooving machine on the ground. Along the peripheral axis of a deep excavation project, under the condition of slurry support, a narrow and long deep groove is excavated. After the groove is cleaned, a steel reinforcement cage is lifted and placed in the groove, and then underwater concrete is poured by the conduit method to form a unit groove section. In this way, it is carried out section by section to build a continuous reinforced concrete wall underground as a water cutoff, anti-seepage, load-bearing, and water retaining structure.

[0003] Currently, diaphragm walls are all cast in sections. During construction, they are connected in pairs through the first-stage groove section and the second-stage groove section to form a closed water-stop curtain on the outer layer of the foundation pit. During the connection process between the groove sections, joints are naturally formed one by one.

[0004] Commonly used diaphragm wall joint forms include rigid joints, flexible joints, and milling joints;

[0005] A rigid joint is a technology that, on the premise of ensuring the connection quality between diaphragm wall groove sections, meets the shear resistance, bending strength, and stiffness of the diaphragm wall, and avoids the joint of the diaphragm wall becoming a weak link in stiffness and strength. Generally, "H"-shaped steel plates or "cross"-shaped steel plates are used to form a rigid connection between diaphragm wall groove sections.

[0006] A flexible joint is a connection where only horizontal concrete penetrates between diaphragm wall groove sections, without using joint steel plates. Its common forms are rubber water stop belts and joint pipes.

[0007] With the development of mechanical equipment manufacturing technology, a double-wheel milling machine that can perform diaphragm wall grooving construction in hard rock and soil strata has emerged. Based on this grooving equipment, a diaphragm wall joint process has been developed, namely the milling joint;

[0008] Different forms of diaphragm wall joints all have advantages and disadvantages in use. As long as joints exist, there is a possibility of leakage in the retaining structure, directly affecting the use of the underground structure. Leakage not only affects the normal use function of the structure, but also is very difficult to handle, and there are deficiencies.

[0009] In summary, in view of the defects existing in the prior art, there is a particular need for a jointless integral cast-in-place diaphragm wall and a construction method thereof to solve the deficiencies of the prior art. Summary of the Invention

[0010] The object of the present invention is to provide a jointless integral cast-in-place diaphragm wall and its construction method, which has a novel structure. With a jointless design, the steel structure baffles are overlapped and lowered and then integrally cast to improve the anti-seepage performance and overall stability of the diaphragm wall.

[0011] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0012] A jointless integral cast-in-place diaphragm wall includes a first grooving section, a connecting section, and a closing section excavated by a grooving machine. A first-opening steel structure baffle is lowered into the first grooving section, a connecting steel structure baffle is lowered into the connecting section, and a closing steel structure baffle is lowered into the closing section.

[0013] The side surface of the first-opening steel structure baffle overlaps with the side surface of the connecting steel structure baffle, adjacent connecting steel structure baffles overlap in sequence, and the connecting steel structure baffle overlaps with the closing steel structure baffle to form an integrally sealed casting interval. An integrally jointless diaphragm wall is made of cast-in-place concrete within the casting interval.

[0014] Furthermore, the first-opening steel structure baffle, the connecting steel structure baffle, and the closing steel structure baffle all include inner and outer steel plates, and support steel blocks are arranged in the middle gaps at both ends of the steel plates.

[0015] Furthermore, the support steel blocks are longitudinally arranged throughout, and the spacing between adjacent support steel blocks is the same.

[0016] Furthermore, both side surfaces of the first-opening steel structure baffle are groove structures.

[0017] Furthermore, one side surface of the connecting steel structure baffle is a groove structure, and the other side surface of the connecting steel structure baffle is a folded surface structure.

[0018] Furthermore, both side surfaces of the closing steel structure baffle are folded surface structures.

[0019] Furthermore, the groove structure is set as a lapping groove, the folded surface structure is set as a lapping plate, and the outer surfaces of the lapping plates are all abutted against the inner walls of the lapping grooves.

[0020] Furthermore, the shape of the lapping groove is U-shaped, the lapping plate is composed of two symmetrically arranged arc-shaped plates, and the arcs of the arc-shaped plates face away from each other.

[0021] Furthermore, all the support steel blocks adopt the same specifications.

[0022] A construction method for a jointless integral cast-in-place diaphragm wall is as follows:

[0023] For the first grooving section of the construction, the length of the first grooving section is determined according to the domestic general diaphragm wall grooving equipment. Lower the steel structure baffle of the first opening section, then excavate the connecting grooving section, and then lower the steel structure baffle of the connecting section, which overlaps with the steel structure baffle of the first opening section. Excavate the connecting grooving section one by one, and lower the steel structure baffle of the connecting section. The steel structure baffles of the connecting sections overlap. Excavate the closed grooving section, and lower the steel structure baffle of the closed section. The steel structure baffle of the closed section overlaps with the steel structure baffle of the connecting section. Then, pour concrete uniformly within the overlapping sealing area. After solidification, a diaphragm wall without joints and with excellent integrity is formed.

[0024] The advantages of the present invention are as follows:

[0025] To sum up, the structure design of the present invention is scientific and reasonable. By adopting the method of integral pouring without joints, there is no construction cold joint, the overall stability is excellent, and it is a jointless design, avoiding the risk of water leakage at the joints from the source, with good anti-seepage performance and convenient construction, providing a new idea for the construction of diaphragm walls, having excellent practical performance and broad application prospects. Description of the Drawings

[0026] Figure 1 is the structural schematic diagram of the present invention;

[0027] Figure 2 is the schematic diagram of the steel structure baffle of the first opening section;

[0028] Figure 3 is the schematic diagram of the steel structure baffle of the connecting section;

[0029] Figure 4 is the schematic diagram of the steel structure baffle of the closed section;

[0030] Figure 5 is the structural diagram of the support steel block of the present invention.

[0031] 1 - First grooving section, 2 - Steel plate, 3 - Steel structure baffle of the first opening section, 4 - Support steel block, 5 - Connecting grooving section, 6 - Steel structure baffle of the closed section, 7 - Steel structure baffle of the connecting section, 8 - Closed grooving section, 9 - Overlapping groove, 10 - Overlapping plate. Detailed Embodiments

[0032] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0033] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the figure, a jointless integral cast-in-place diaphragm wall includes a first grooving section 1, a connecting section 5, and a closing section 8 dug by a grooving machine. A first-opening steel structure baffle 3 is lowered into the first grooving section 1, a connecting-opening steel structure baffle 7 is lowered into the connecting section 5, and a closing-opening steel structure baffle 6 is lowered into the closing section 8.

[0034] The side surface of the first-opening steel structure baffle 3 overlaps with the side surface of the connecting-opening steel structure baffle 7, the adjacent connecting-opening steel structure baffles 7 overlap with each other in sequence, and the connecting-opening steel structure baffle 7 overlaps with the closing-opening steel structure baffle 6 to form an integrally sealed pouring area. An integrally jointless diaphragm wall is made of cast-in-place concrete within the pouring area.

[0035] In addition, the first-opening steel structure baffle 3, the connecting-opening steel structure baffle 7, and the closing-opening steel structure baffle 6 all include steel plates 2 on the inner and outer sides. Support steel blocks 4 are arranged in the middle gaps at both ends of the steel plates 2. The support steel blocks 4 all adopt the same specifications, the support steel blocks 4 are longitudinally arranged throughout, the intervals between adjacent support steel blocks are the same, and the support steel blocks are reinforcing ribs between the steel plates, enhancing the stability performance of the diaphragm wall.

[0036] A construction method of a jointless integral cast-in-place diaphragm wall is as follows:

[0037] Construct the first grooving section. The length of the first grooving section is determined according to the domestic general diaphragm wall grooving equipment. Lower the first-opening steel structure baffle, then excavate the connecting section, and then lower the connecting-opening steel structure baffle to overlap with the first-opening steel structure baffle. Excavate the connecting sections one by one, and lower the connecting-opening steel structure baffles. The connecting-opening steel structure baffles overlap with each other. Excavate the closing section, and lower the closing-opening steel structure baffle. The closing-opening steel structure baffle overlaps with the connecting-opening steel structure baffle. Both side surfaces of the first-opening steel structure baffle 3 of the present invention are groove structures, one side surface of the connecting-opening steel structure baffle 7 is a groove structure, and the other side surface of the connecting-opening steel structure baffle 7 is a folded surface structure. Both side surfaces of the closing-opening steel structure baffle 6 are folded surface structures. The groove structure is set as a lapping groove 9, and the folded surface structure is set as a lapping plate 10. The outer surfaces of the lapping plates 10 are all abutted against the inner walls of the lapping grooves 9. The shape of the lapping groove 9 is U-shaped, and the lapping plate 10 is composed of two symmetrically arranged arc-shaped plates, and the arcs of the arc-shaped plates are arranged back to back. In the embodiments of the present invention, all lappings adopt the form of the lapping plate abutting against the lapping groove, so that the first-opening steel structure baffle, the connecting-opening steel structure baffle, and the closing-opening steel structure baffle form a complete pouring area, and support steel blocks arranged throughout are provided on both sides of all the steel structure baffles. Then, concrete is uniformly poured in the lapped sealed area, and after solidification, a jointless and integrally excellent diaphragm wall is formed, which is not only simple in construction, but also has better anti-seepage performance and overall stability, and saves costs. Generally, the steel content of the diaphragm wall is 180 kg / m³. After actual calculation, the steel content of the diaphragm wall of the present invention is about 130 kg / m³, which is beneficial to construction.

[0038] The advantages of the present invention are as follows:

[0039] In summary, the structure of the present invention is scientifically and reasonably designed. By adopting the method of seamless integral pouring, there is no construction cold joint, the overall stability is excellent, and it is a seamless design, avoiding the risk of water leakage at the joint at the source, with good anti-seepage performance and convenient construction, providing a new idea for the construction of diaphragm walls, having excellent practical performance and broad application prospects.

[0040] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it. However, it should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An integral cast-in-place diaphragm wall without joints, comprising a first grooving section, a connecting grooving section, and a closing grooving section dug by a grooving machine, characterized in that, Lower the first-opening-section steel structure baffle in the first-opening section, lower the connecting-section steel structure baffle in the connecting section, and lower the closing-section steel structure baffle in the closing section; The side surfaces of the first-opening-section steel structure baffle and the connecting-section steel structure baffle overlap, the adjacent connecting-section steel structure baffles overlap in sequence, and the connecting-section steel structure baffle and the closing-section steel structure baffle overlap to form an integrally sealed pouring area. In the pouring area, a monolithic jointless diaphragm wall is made by cast-in-place concrete; Both side surfaces of the first-opening-section steel structure baffle are groove structures; One side surface of the connecting-section steel structure baffle is a groove structure, and the other side surface of the connecting-section steel structure baffle is a folded surface structure; Both side surfaces of the closing-section steel structure baffle are folded surface structures; The groove structure is set as a lapping groove, and the folded surface structure is set as a lapping plate. The outer surfaces of the lapping plates are all abutted against the inner walls of the lapping grooves; The shape of the lapping groove is U-shaped, and the lapping plate is composed of two symmetrically arranged arc-shaped plates, and the arcs of the arc-shaped plates are arranged back to back; 2. The monolithic cast-in-place diaphragm wall without joints according to claim 1, wherein, The first-opening-section steel structure baffle, the connecting-section steel structure baffle, and the closing-section steel structure baffle all include inner and outer steel plates, and support steel blocks are arranged in the middle gaps at both ends of the steel plates; 3. The monolithic cast-in-place diaphragm wall without joints according to claim 2, wherein The support steel blocks are longitudinally arranged throughout, and the distances between adjacent support steel blocks are the same; 4. A jointless integral cast-in-place diaphragm wall according to claim 2, characterized in that, All the support steel blocks adopt the same specifications; 5. A construction method for a jointless monolithic cast-in-place diaphragm wall according to any one of claims 1 to 4, characterized in that, The length of the first-opening section is determined according to the domestic general diaphragm wall grooving equipment. Lower the first-opening-section steel structure baffle, then excavate the connecting section, and then lower the connecting-section steel structure baffle to overlap with the first-opening-section steel structure baffle. Excavate the connecting sections one by one, and lower the connecting-section steel structure baffles. The connecting-section steel baffles overlap. Excavate the closing section, and lower the closing-section steel structure baffle. The closing-section steel structure baffle and the connecting-section steel structure baffle overlap. Then, uniformly pour concrete in the overlapped sealed area. After solidification, a jointless and integrally excellent diaphragm wall is formed.

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