A construction method for supporting with prestressed steel sheet pile supporting structure

A technology of support structure and construction method, which is applied in the direction of basic structure engineering, excavation, construction, etc., can solve the problems of cumbersome support procedures, poor stability, inconvenient operation, etc., achieve large lateral rigidity, strong bending resistance, and save costs Effect

Active Publication Date: 2017-06-30
JIANGSU DONGHENAN GEOTECHNICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a construction method using prestressed steel sheet pile support structure to solve the technical problems of poor stability of deep foundation pit support structure, cumbersome support process and inconvenient operation in the prior art

Method used

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  • A construction method for supporting with prestressed steel sheet pile supporting structure
  • A construction method for supporting with prestressed steel sheet pile supporting structure
  • A construction method for supporting with prestressed steel sheet pile supporting structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Determine the length of support pile 1, the number of steel supports 3, the length of steel supports 3 and the adjacent steel supports on each prestressed support unit according to the geological data of the foundation pit to be excavated, the depth of excavation and the surrounding environmental conditions The distance between the seat 3 is to anchor one end of the prestressed tendon 4 to the lower part of the support pile 1, and the other end of the prestressed tendon passes through the limit devices 5 on all steel supports 3 in turn to prefabricate the prestressed support unit.

[0055] Such as figure 1 As shown, the length of the support pile 1 is 15m, the excavation depth of the foundation pit is 10m, two steel sheet piles are connected between adjacent support units, and the entire support structure forms a cofferdam. Each support pile 1 is provided with three steel supports 3, the maximum distance between adjacent steel supports 3 on each support pile 1 is 3m, th...

Embodiment 2

[0057] Such as Figure 4 As shown, the length of the support pile 1 is 18m, the excavation depth of the foundation pit is 12m, a steel sheet pile is connected between adjacent support units, and the entire support structure forms a cofferdam. Each support pile 1 is provided with five steel supports 3, the maximum distance between adjacent steel supports 3 on each support pile 1 is 3m, the minimum value is 1m, and the longest steel support 3 has a length of 0.7m, each prestressed support unit is provided with four prestressed prestressed tendons 4, the nominal diameter of each prestressed prestressed tendons 4 is 15.2mm, and the supporting pile 1 is 6m deep below the bottom of the pit.

Embodiment 3

[0059] Such as Figure 5 As shown, the length of the support pile 1 is 30m, the excavation depth of the foundation pit is 15m, a steel sheet pile is connected between adjacent support units, and the entire support structure forms a cofferdam. Each support pile 1 is provided with seven steel supports 3, the maximum distance between adjacent steel supports 3 on each support pile 1 is 3m, the minimum value is 1m, and the longest steel support 3 has a length of 0.9m, five prestressed tendons 4 are arranged on each prestressed support unit, the nominal diameter of each prestressed prestressed tendon 4 is 15.2mm, and the support pile 1 is 15m deep below the bottom of the pit.

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Abstract

The invention discloses a construction method for supporting with a prestressed steel sheet pile support structure. The prestressed steel sheet pile support structure includes a plurality of prestressed support units, and each prestressed support unit includes support piles, multiple Steel supports and prestressed tendons. The support pile is vertically arranged on one side of the foundation pit to be excavated, a plurality of steel supports are arranged on the support pile from top to bottom, and one end of the prestressed tendon is anchored to the lower part of the support pile. Drive multiple prestressed support units into the surroundings of the foundation pit to be excavated in sequence, with multiple steel supports facing the foundation pit to be excavated, and set a crown beam on the top of the prestressed support unit so that the prestressed support unit It is integrated with the crown beam; the tension is applied through the prestressed tendons, and the upper end of the prestressed prestressed tendons is anchored on the crown beam. The horizontal component of the tensile force on the prestressed tendons is transmitted to the support structure, which offsets part of the earth pressure of the soil, improves the support strength, and reduces the deformation of the support pile; in addition, the support structure can be recycled and reused, saving cost.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a construction method for supporting with a prestressed steel sheet pile supporting structure. Background technique [0002] When protecting deep foundation pits, the existing retaining piles usually adopt bored piles or immersed pipe piles, and all of them adopt the construction method of pouring on site. For example, the application number 201420330061.X, the invention name is the utility model patent of cast-in-place external prestressed steel pipe concrete pile and supporting pile wall, which includes steel pipes, concrete layers cast in-situ inside the steel pipes and set on the steel pipes. The prestressed tendons are arranged along the axial direction of the steel pipe, including a top section, a middle section and a bottom section. The upper end of the steel pipe is open, and the bottom end has a closed structure. The present invention also provides a supporting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
Inventor 王建兰
Owner JIANGSU DONGHENAN GEOTECHNICAL TECH CO LTD
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