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Prestressed steel sheet pile supporting structure and construction method thereof

A supporting structure and prestressing technology, which is applied in basic structure engineering, excavation, construction, etc., can solve the problems of cumbersome supporting procedures, poor stability of deep foundation pit supporting structure, inconvenient operation, etc. Support strength, cost saving effect

Active Publication Date: 2015-12-09
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 prestressed steel sheet pile support structure and its construction method to solve the technical problems of poor stability, cumbersome support process and inconvenient operation of the deep foundation pit support structure in the prior art

Method used

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  • Prestressed steel sheet pile supporting structure and construction method thereof
  • Prestressed steel sheet pile supporting structure and construction method thereof
  • Prestressed steel sheet pile supporting structure and construction method thereof

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 prestressed steel sheet pile supporting structure and a construction method thereof. The prestressed steel sheet pile supporting structure comprises a plurality of prestressed supporting units, wherein each prestressed supporting unit comprises a supporting pile, a plurality of steel supports and a prestressed tendon; each supporting pile is vertically arranged on one side of a to-be-excavated foundation pit; a plurality of the steel supports are arranged on the corresponding supporting pile from top to bottom; one end of each prestressed tendon is anchored at the lower part of the corresponding supporting pile. According to the construction method, a plurality of the prestressed supporting units are sequentially driven into soil around the to-be-excavated foundation pit, a plurality of the steel supports all face the to-be-excavated foundation pit, and a top beam is arranged at the top ends of the prestressed supporting units, so that the prestressed supporting units and the top beam form an integral body; tensile force is applied through the prestressed tendons, and the upper ends of the prestressed tendons are anchored on the top beam. According to the prestressed steel sheet pile supporting structure and the construction method thereof, the horizontal component of tensile force borne by the prestressed tendons is transmitted to the supporting structure, partial earth pressure of soil is counteracted, the supporting intensity is improved, and deformation of the supporting piles is reduced; besides, the supporting structure can be recycled, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a prestressed steel sheet pile support structure and a construction method thereof. 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 pile wall h...

Claims

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Application Information

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