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Underground diaphragm wall seam water stop strengthening measure and detection method

A technology of underground diaphragm wall and detection method, which is applied in water conservancy projects, underwater structures, artificial islands, etc., can solve problems such as leakage, and achieve the effects of low implementation risk, improved quality, and prevention of potential safety hazards.

Pending Publication Date: 2021-12-07
中交哈尔滨地铁投资建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of mud and leakage in the joints of the existing continuous wall, and provide a water-stopping measure and detection method for the joints of the underground continuous wall to solve the above-mentioned existing problems

Method used

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  • Underground diaphragm wall seam water stop strengthening measure and detection method
  • Underground diaphragm wall seam water stop strengthening measure and detection method
  • Underground diaphragm wall seam water stop strengthening measure and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A water-stop strengthening measure and detection method for an underground diaphragm wall joint, the method comprising the following steps:

[0038] Step 1: The ground connection wall joint adopts the rigid joint of cross steel plate, and the joint is processed and prefabricated in the factory to ensure the quality of the weld seam.

[0039] Step 2: Weld the angle steel at both ends of the cross steel plate joint to place the anti-slip iron sheet. The longitudinal length of the iron sheet is equal to the wall of the ground connection wall, and the width of the iron sheet is 900mm;

[0040] Step 3: A steel sleeve valve pipe is pre-embedded on the sealing rib of the reinforcement cage outside the cross steel plate at the joint of each ground connection wall;

[0041] Sleeve tube protection measures:

[0042] ①The segments of the sleeve valve tube are connected by sleeve wire, the thread buckle is wrapped around the raw material belt, and the bottom is closed with a welde...

Embodiment 2

[0050] According to the measures and detection methods for strengthening the waterproofing of underground continuous wall joints described in Embodiment 1, the detection method in the described step 5 includes the following steps:

[0051] (1) Whether there is a seepage channel in the overall high water pressure test;

[0052] Install a grouting valve on the top of the sleeve valve pipe, and use a high-pressure grouting pump above 6Mpa to conduct a hydraulic test on the pipe section. If there is no obvious pressure drop or flow rate, it can be confirmed that the quality of the seam seal is good. The flow rate indicates that there is a seepage channel in the joint;

[0053] (2) Determine the specific location of the seepage channel;

[0054] If there is a seepage channel in the test, further use the sleeve valve pipe matching grouter to gradually layer up from the bottom, and conduct a hydraulic test every 20cm. location, and finally find out the specific number and location ...

Embodiment 3

[0059] According to the measures and detection methods for strengthening the waterproofing of underground continuous wall joints described in Embodiment 1 or 2, the specific steps of the third step are as follows:

[0060] The sleeve valve tube is made of Φ48*2.8mm seamless steel pipe (the surface of the steel pipe needs to be derusted), and a grouting valve is set at a longitudinal interval of 200mm. Each grouting valve includes 4 Φ6 grouting holes in the circumferential direction, and the jacket is 80mm wide. The two ends of the valve (a bicycle inner tube is enough) and the leather valve are fixed by tape wrapping. Each section of the sleeve valve tube is 6m long, and the sections are connected by sleeves;

[0061] The sleeve valve tube is bound and fixed inside the inflection point of the groove of the sealing rib during the steel cage processing stage. The embedment range of the sleeve valve pipe is from the surface to the depth of 6m below the bottom of the foundation pi...

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Abstract

The invention discloses an underground diaphragm wall seam water stop strengthening measure and a detection method. The construction quality of an underground diaphragm wall, especially the joint water stop quality, is an important link for determining the safety of a foundation pit, and once mud is clamped in a joint, water leakage accidents are likely to happen. The method comprises the following steps that a cross-shaped steel plate rigid joint is adopted as an underground diaphragm wall joint, and a cross-shaped steel plate is longitudinally arranged with the same length as a reinforcement cage; angle steel is welded to the two ends of the cross-shaped steel plate connector and used for placing a grout stopping iron sheet, the longitudinal length of the iron sheet is equal to the length of the underground diaphragm wall body, and the width of the iron sheet is 900 mm; a steel sleeve valve pipe is pre-buried on a sealing rib of the reinforcement cage on the outer side of the cross-shaped steel plate at the joint of each underground diaphragm wall; after construction of the diaphragm wall is finished, three triple-pipe high-pressure jet grouting piles are driven on the outer side of a joint in a delta shape, and the pile bottoms penetrate into the position below the bottom of the foundation pit by 6.0 m; and after the concrete of the diaphragm wall reaches the design strength, the water stop quality of the joint can be detected through the pre-embedded sleeve valve pipe. The device and the method are used for underground diaphragm wall seam waterstop reinforcement and detection.

Description

Technical field: [0001] The invention relates to a water-stop strengthening measure and a detection method of an underground continuous wall joint. Background technique: [0002] The construction quality of the ground connection wall, especially the joint water-stop quality, is an important link to determine the safety of the foundation pit. Once the joints are covered with mud, water leakage accidents will easily occur, especially when the ground connection wall is used as the foundation of the enclosure structure. 90% of the soil layer within the scope of influence of the pit is fine sand and medium sand, with low mud content and high permeability coefficient. When water and mud gushing occur, the danger develops rapidly and the consequences are more serious. Invention content: [0003] The purpose of the present invention is to solve the problems of mud and leakage in the joints of continuous walls at present, and provide a water-stopping measure and detection method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/16E02D33/00
CPCE02D29/16E02D33/00
Inventor 刘运生梁宇吕计瑞
Owner 中交哈尔滨地铁投资建设有限公司
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