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Anti-seepage joint of underground continuous walls and construction method thereof

An underground diaphragm wall and joint technology, applied in the field of foundation foundation, can solve problems such as leakage of underground diaphragm wall joints, and achieve the effects of simple construction, increased joint stiffness and low cost.

Inactive Publication Date: 2009-11-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, local leakage is prone to occur at the joints of the underground diaphragm wall

Method used

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  • Anti-seepage joint of underground continuous walls and construction method thereof
  • Anti-seepage joint of underground continuous walls and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The excavation area of ​​a high-rise residential building foundation pit project is 12,300 m 2 , and the depth of the foundation pit is 15.130m. The foundation pit is surrounded by an underground diaphragm wall, the depth of which is 34 meters, the thickness of the wall is 1.0 meters, and the joint form is a cross steel joint.

[0043] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0044] ①Artificial fill and miscellaneous fill, thickness 2.3m;

[0045] ② Silty clay, thickness 5.1m

[0046] ③ Silt, thickness 11.4m;

[0047] ④ Silty clay, thickness 5.7m;

[0048] ⑤silt, thickness 9.80m;

[0049] ⑥silt, thickness 8.10m;

[0050] ⑦silty clay, thickness 14.5m;

[0051] ⑧silt, thickness 16.30m.

[0052] The support structure adopts underground diaphragm wall and internal support, and is constructed by open-cut method.

[0053] A 37-meter-long steel pipe is pre-welded at the intersection of the cross st...

Embodiment 2

[0056] The excavation project of a subway tunnel is 260m long, 20.5m wide, and the excavation depth is 15.420m. The surrounding of the foundation pit adopts an underground diaphragm wall, the depth of which is 35 meters, the thickness of the wall is 1.2 meters, and the joint form is a cross steel plate joint.

[0057] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0058] ①Artificial fill and miscellaneous fill, thickness 3.4m;

[0059] ② Silt, thickness 12.1m;

[0060] ③ Silty clay, thickness 7.6m;

[0061] ④ Silt, thickness 8.5m;

[0062] ⑤ Silt, thickness 10.0m;

[0063] ⑥silty clay, thickness 12.5m;

[0064] ⑦ Silt, thickness 10.3m;

[0065] ⑧silt, thickness 5.4m.

[0066] The support structure adopts underground diaphragm wall and internal support, and is constructed by open-cut method.

[0067] A 39-meter-long steel pipe is pre-welded at the intersection of the cross steel plate joints. The diameter ...

Embodiment 3

[0070] The foundation pit project of a subway station is 463m long, 19.35m wide, and 18.590m deep. The surrounding of the foundation pit adopts an underground diaphragm wall, the depth of the earth connecting wall is 38 meters, the wall thickness is 1.2 meters, and the joint form is a cross steel plate joint.

[0071] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0072] ①Artificial fill and miscellaneous fill, thickness 4.50m;

[0073] ② Silt, thickness 13.00m;

[0074] ③ Silty clay, thickness 8.0m;

[0075] ④ Silt, thickness 12.80m;

[0076] ⑤silt, thickness 13.10m;

[0077] ⑥Silly clay with a thickness of 21.5m.

[0078] The support structure adopts underground diaphragm wall and internal support, and is constructed by open-cut method.

[0079] A 41-meter-long steel pipe with a diameter of 100mm is pre-welded at the intersection of the cross steel plate joints, and holes are pre-drilled within 5m of the ...

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Abstract

The invention discloses an anti-seepage joint of underground continuous walls, which comprises a cross steel plate joint. A joint steel plate is crosswise connected with an end-enclosing steel plate to form the cross steel plate joint. A high-pressure slip-casting steel pipe is welded along the end-enclosing steel plate, at one side of the first wall and at the crossed connection of the joint steel plate and the end-enclosing steel plate. A plurality of grouting holes are arranged on the lower part of the high-pressure grouting steel pipe. The invention also discloses a construction method of the anti-seepage joint. In the invention, the technology for reinforcing the wall bottom by the steel pipes embedded in the steel reinforcement cage of the underground continuous walls is applied to the cross steel plate joints of the underground continuous walls. The anti-seepage processing method of the cross steel plate joints of the underground continuous walls is improved, thus achieving the anti-seepage purpose, also enhancing the rigidity of the joints and playing a role in reinforcing the joint part of the wall bottom. The invention simultaneously fulfills the seepage prevention, rigidity reinforcement and wall bottom reinforcement and has the advantages of simple construction, low construction cost and easy guarantee of the construction quality.

Description

technical field [0001] The invention relates to the field of foundations, in particular to an anti-seepage joint of an underground continuous wall and a construction method thereof. Background technique [0002] The underground diaphragm wall is to use certain construction equipment and tools to drill a groove section with a certain thickness, length and depth underground under the condition of mud retaining wall, and put the processed steel cage in the groove section, and then pour it into Concrete is built into a section of reinforced concrete wall sections, which are connected one by one to form a continuous underground wall. [0003] The underground diaphragm wall can be constructed under various complex conditions and is suitable for various soil properties. The construction vibration is small, the noise is low, and the impact on the environment is small. The most important thing is that the overall anti-seepage performance is good and the overall rigidity is large. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/02E02D5/20
Inventor 郑刚杨建民
Owner TIANJIN UNIV
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