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Cofferdam construction method and cofferdam structure

A construction method and cofferdam technology, which is applied in infrastructure engineering, sea area engineering, water conservancy engineering, etc., can solve problems such as cofferdam stability and barrier defects, and achieve the effect of ensuring water-retaining performance and improving stability

Inactive Publication Date: 2020-10-02
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For cofferdam construction, because the underwater covering layer is generally soft muddy soft covering layer, there are certain defects in the stability and barrier properties of the existing cofferdams

Method used

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  • Cofferdam construction method and cofferdam structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 Shown in, a kind of cofferdam construction method comprises the following steps:

[0046] 1) Filling of underwater dike 1:

[0047] Adopt the "flat plugging method", and carry out layer-by-layer throwing and filling in the order of "first far and then advance, first deep and then shallow";

[0048] 2) The cavity slag reverse filter material 2 filling inside the weir body:

[0049] Use the "invasion method" to fill the hole slag reverse filter material 2 along the inner side of the embankment 1. After the filling is completed, use a vibrating roller to carry out strong vibration rolling compaction;

[0050] 3) Soil and rock backfill 3 filling:

[0051] The earth-rock backfill 3 is filled in two layers. After the filling of the lower earth-rock backfill 3 is completed, the upper layer of earth-rock backfill 3 is filled to the design elevation after the anti-seepage wall 6 is completed;

[0052] 4) Construction of anti-seepage wall 6:

[0053] The per...

Embodiment 2

[0068] On the basis of embodiment 1, cofferdam observation and cofferdam demolition construction are also included:

[0069]After the cofferdam observation is completed, a settlement observation point is respectively set at the two inflection points on the back water surface of the cofferdam, and 50cm×50cm is reserved at the two inflection point positions of the cofferdam during the construction of the sprayed concrete slope protection 10 on the back water side. space for setting settlement observation points;

[0070] Described cofferdam demolition construction comprises the following steps:

[0071] 1) Drop the trash rack and working gate at the water inlet;

[0072] 2) Excavate from the top of the weir body to the top surface elevation of the earth-rock backfill 3 in the lower layer in the manner of "back to the water surface first and then face the water surface";

[0073] 3) Relying on the protection of the anti-seepage wall 6 to excavate the lower earth-rock backfill 3...

Embodiment 3

[0079] Based on the cofferdam structure of the cofferdam construction method described in Example 1, the inner side of the dike 1 is filled with a slag reverse filter material 2, and the weir body surrounded by the dike 1 is filled with earth and rock backfill 3, The middle part of the earth-rock backfill 3 is poured with a cut-off wall 6 extending to the covering layer 11, the earth-rock backfill 3 above the cut-off wall 6 is provided with a composite geomembrane 7, and the top of the earth-rock backfill 3 above the composite geomembrane 7 is poured with Pressing the top 8, a wave retaining wall 9 is arranged on the side facing the water of the top pressing 8.

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Abstract

The invention discloses a cofferdam construction method. The method comprises the following steps of 1) filling an underwater embankment; 2) filling a hole slag inverted filter material on the inner side of a weir body; 3) filling a soil and stone backfill material; 4) diaphragm wall construction; 5) curtain grouting construction; 6) constructing a composite geomembrane; 7) coping and wave wall construction; and 8) slope construction. The inner side face of the embankment is filled with the hole slag inverted filter material, the weir body defined by the embankment is filled with the soil andstone backfill material, a diaphragm wall extending to a covering layer is poured in the middle of the soil and stone backfill material, the composite geomembrane is arranged in the soil and stone backfill material above the diaphragm wall, a coping is poured at the top of the soil and stone backfill material above the composite geomembrane, and a wave wall is arranged on one side of the upstreamface of the coping. According to the method, the stability of the cofferdam and the water retaining performance of the cofferdam are effectively improved, and safer conditions are provided for cofferdam construction.

Description

technical field [0001] The invention relates to the field of cofferdam construction, in particular to a cofferdam construction method and a cofferdam structure. Background technique [0002] Cofferdam refers to the temporary enclosure structure built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. , to build buildings; generally used in hydraulic construction, except as a part of the formal building, the cofferdam is generally removed after use, and the height of the cofferdam is higher than the highest water level that may occur during the construction period; the role of the cofferdam It can not only waterproof and surround water, but also support the pit wall of the foundation pit. [0003] For cofferdam construction, because the underwater covering layer is generally soft muddy soft covering layer, there are certain defects in the stability and barrier properties of the existing cofferdams. Contents of ...

Claims

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Application Information

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IPC IPC(8): E02D19/04E02B3/06E02B3/12E02B3/10E02B3/18E02B3/16E02B3/14
CPCE02B3/06E02B3/10E02B3/12E02B3/14E02B3/18E02D19/04
Inventor 江新张婧怡江东平姚成铭
Owner CHINA THREE GORGES UNIV