Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof

A technology of combining cofferdams and steel sheet piles, applied in infrastructure engineering, construction, etc., can solve problems such as instability and damage, water seepage, and large deformation of steel sheet piles, so as to enhance stability, improve impermeability, and improve overall stability. Effects of Sex and Safety

Inactive Publication Date: 2014-03-26
张安政
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this kind of flexible support structure that can undergo large deformation, the relationship between the steel sheet pile and the support system has a great influence on the deformation of the steel sheet pile, and even affects the stability of the cofferdam system, causing instability and damage
[0005] The traditional double-row steel sheet pile cofferdam is mostly used in bridge foundation pile foundation construction, because the plane of the cofferdam is small, and it usually forms a square or a circle, and the use of horizontal braces or diagonal braces between the steel sheet piles can effectivel...

Method used

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  • Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof
  • Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof
  • Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A composite cofferdam structure with double-layer steel sheet pile soil core without internal support, its schematic diagram is as follows figure 1 with 2 As shown, including steel sheet pile 1 on the upstream surface and steel sheet pile 2 on the rear surface (steel sheet piles on the upstream surface and steel sheet pile 2 on the rear surface are formed by interlocking the steel sheet piles through locks), and the filling between the steel sheet piles (1 and 2) Cohesive soil forms a cofferdam. A composite geomembrane 3 is laid on the inner side of the steel sheet pile 1 cofferdam on the water-facing surface to prevent seepage and water. The upper part between the two steel sheet piles (1 and 2) is connected by tie rod 4, and the outer side of the steel sheet pile (1 and 2) is provided with a waist beam 5, and the tie rod 4 is connected through the waist beam 5 by bolts 9, and the bolt 9 is arranged on the outer side of the waist beam 5 . After the cohesive soil 6 i...

Embodiment 2

[0027] The double-layer steel sheet pile soil core composite cofferdam structure without internal support is firstly laid with Larsen IV-type steel sheet piles on both sides. The embedded depth of the steel sheet piles is controlled according to the elevation of the pile tops, and each row of steel sheet piles is locked and connected. After the construction of the steel sheet piles on both sides, the waterproof geomembrane of the steel sheet piles on the water-facing surface will be hung, and the geomembrane will use bagged soil for the bottom presser foot. Then carry out the construction of steel sheet pile waist beams and tie rods on both sides. The waist beams are set on the outside of the steel sheet piles. The tie rods are connected horizontally with 32 threaded steel along the direction of the cofferdam at a distance of 1.6m. The outer sides are made of 28b channel steel waist beams. Holes need to be drilled with the waist beam, and bolts are used to connect the tie rod a...

Embodiment 3

[0029] The composite cofferdam structure of double-layer steel sheet pile soil core without internal support is applied to the construction of Wuhan East Lake Channel Project. The Donghu Passage project is planned to start from the Hongmiao Interchange of the Second Ring Road in the north and connect with the Shuidong Section of the Second Ring Road in the north, and end at the intersection of Yujiahu Road and Yujiashan North Road in the south. The total length is about 10.6 kilometers, of which the length of the tunnel in the lake is about 4.94 kilometers. The middle section of the tunnel lake adopts two structural forms of steel sheet pile cofferdam and soil cofferdam. The total cofferdam length on one side of the project is about 8.05 kilometers, of which the length of the steel sheet pile cofferdam without internal support is about 7.36 kilometers, and the total area of ​​the cofferdam is about 550,000 m 2 , the distance between the cofferdam and the outer edge of the tunn...

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Abstract

The invention discloses a double-layer steel sheet pile soil core composite cofferdam structure without an inner support and the application of the double-layer steel sheet pile soil core composite cofferdam structure without an inner support, and belongs to the field of water conservancy projects. The double-layer steel sheet pile soil core composite cofferdam structure without an inner support comprises an upstream-face steel sheet pile and a downstream-face steel sheet pile, and the space between the steel sheet piles is filled with cohesive soil to form a cofferdam; a composite geo-membrane is laid on the portion, inside the cofferdam, of the upstream-face steel sheet pile; the upper portions of the two steel sheet piles are connected through a pull rod, middle beams are arranged outside the steel sheet piles, and the pull rod is connected with the middle beams through bolts arranged outside the corresponding middle beams. When the filling cofferdam core cohesive soil is in the same level with the pull rod, the space between the steel sheet piles is further filled with a layer of hairy residues, and a sub-cofferdam is arranged on the upstream-face steel sheet pile. The cofferdam structure can be used for building strip-shaped subsurface structures in a river or lake through the open-cut method. The cofferdam structure is stable and safe, and the problem that a steel sheet pile flexible structure is large in deformation is solved by arranging the pull rod on the tops of the two steel sheet piles; a three-level waterproofing system improves the anti-penetrability performance of the steel sheet pile cofferdam significantly.

Description

[0001] technical field [0002] The invention belongs to the field of water conservancy project construction, and relates to a composite cofferdam structure of double-layer steel sheet pile soil core without internal support and an application thereof. Background technique [0003] At present, steel sheet piles have a wide range of application examples in our country: steel sheet piles can be used in deep water wharfs, especially for dock walls and ship lock walls with impermeable requirements; in embankment projects, steel sheet piles can be used for anti-seepage walls The project is a semi-closed or fully closed anti-seepage system formed by steel sheet piles, a relatively impermeable layer under the permeable layer of the embankment foundation, a geomembrane, and an overlying soil layer; in deep foundation pit projects, steel sheet piles form enclosure walls, It has good soil retaining and anti-seepage properties, good integrity, and has the characteristics of high stren...

Claims

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Application Information

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IPC IPC(8): E02D19/04
Inventor 张安政徐顺平贾瑞华谢学彬柳志平徐朝政
Owner 张安政
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