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Earth rock cofferdam anti-seepage construction method combining high-pressure jet grouting and clay core wall

A technology of earth-rock cofferdam and clay core wall, which is applied in the direction of basic structure engineering, construction, etc., to achieve the effects of shortening the construction period, increasing the contact area, and improving the anti-seepage effect

Pending Publication Date: 2021-11-26
CCFEB CIVIL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of the above-mentioned single anti-seepage form in the earth-rock cofferdam with sand and gravel as the filling material, the present invention proposes an anti-seepage construction method of the earth-rock cofferdam using high-spray anti-seepage combined with a clay core wall. The advantages of clay core wall anti-seepage and high-pressure rotary grouting anti-seepage are realized. The construction process is simple and feasible, and the anti-seepage effect of earth-rock cofferdam can meet the requirements of dry land construction of permanent hydraulic structures.

Method used

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  • Earth rock cofferdam anti-seepage construction method combining high-pressure jet grouting and clay core wall
  • Earth rock cofferdam anti-seepage construction method combining high-pressure jet grouting and clay core wall
  • Earth rock cofferdam anti-seepage construction method combining high-pressure jet grouting and clay core wall

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Embodiment 1

[0032] Seepage prevention construction method of earth-rock cofferdam with high-spray anti-seepage combined with clay core wall, please refer to figure 1 , which includes the following steps:

[0033] 1) Dike filling

[0034] The filling method is adopted to fill the embankment 4; the embankment method includes a double embankment construction method that throws and fills directly into the water from both ends of the river channel to the middle, and a single embankment construction method that enters from one end to the other end;

[0035] 2) Elevation of the embankment

[0036] After the embankment 4 is closed, the lower cofferdam 201 is filled with sand and pebbles from both sides of the embankment 4, and then the lower clay core wall 101 is filled in the middle to form the underlying structure of the earth-rock cofferdam with a thickness of 0.5-2m. 3. Heighten the embankment 4;

[0037] 3) High pressure jet grouting construction

[0038] After the embankment 4 is height...

Embodiment 2

[0055] In order to better understand the present invention, more specific examples are given below. In the anti-seepage construction method of the earth-rock cofferdam with high-spray anti-seepage combined with clay core wall in this embodiment, the width of the cofferdam crest is 5m, the maximum weir height is about 14m, the slope ratio of the upstream side is 1:2, and the slope ratio of the backside is 1:2. 1:1.5, the filling of the weir body is river bed sand and pebbles, and the anti-seepage of the cofferdam adopts the combination of high-spray grouting and clay core wall; 11m; see figure 1 , the specific construction steps of this embodiment are as follows:

[0056] 1) Dike filling

[0057] For the filling construction of the cofferdam, the underwater part is constructed by throwing the filling method, and the filling is directly thrown into the water from both ends to the middle, and the filling of the embankment 4 is carried out; the material is loaded by a backhoe ex...

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Abstract

The invention discloses an earth rock cofferdam anti-seepage construction method combining high-pressure jet grouting and a clay core wall. The anti-seepage construction method is characterized by comprising the following steps: (1) filling a dike: filling the dike by adopting a throwing and filling method; (2) heightening an embankment: specifically, after the embankment is closed, filling the two sides of the embankment with a lower-layer cofferdam first, then filling the middle of the lower-layer cofferdam with a lower-layer clay core wall, and forming an earth rock cofferdam bottom layer structure with the thickness of 0.5-2 m through filling to heighten the embankment; (3) carrying out high-pressure jet grouting construction; (4) filling the top layer of the earth rock cofferdam; and (5) carrying out surface protection and foot protection construction. According to the method, the advantages of clay core wall seepage prevention and high-pressure jet grouting seepage prevention are integrated, the construction process is simple and feasible, and it is ensured that the earth rock cofferdam seepage prevention effect meets the requirement for permanent hydraulic structure dry land construction.

Description

technical field [0001] The invention belongs to the construction field of water conservancy and hydropower projects, and in particular relates to a construction method for anti-seepage treatment of an earth-rock cofferdam on a sand and gravel covering layer. Background technique [0002] Cofferdam is a temporary water-retaining hydraulic structure used to enclose the construction of permanent hydraulic structures. After the foundation pit is drained, dry construction conditions are formed to ensure the smooth progress of permanent building construction. According to different weir materials, it can be divided into earth-rock cofferdam, concrete cofferdam, steel sheet pile cofferdam, masonry masonry cofferdam, bamboo cage cofferdam, wooden cage cofferdam, geotechnical bag cofferdam and grass-soil cofferdam, etc. Among them, earth-rock cofferdams are often preferred in design because they can make full use of local materials, have strong adaptability to foundations, easy to ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/04E02D15/06
CPCE02D19/04E02D15/06
Inventor 张红卫王鹏李宁李明周闽
Owner CCFEB CIVIL ENG
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