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Construction method of foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support

A foundation pit support and construction method technology, which is applied in the direction of foundation structure engineering, excavation, sheet pile walls, etc., can solve the problems of occupying space, cannot provide enough space, and is not widely used, so as to achieve reasonable structure and save internal support , the effect of convenient installation

Inactive Publication Date: 2021-12-10
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional back pressure support method of retaining soil in the foundation pit needs to occupy a certain space, and the construction conditions of many foundation pit excavations cannot provide enough space to implement the back pressure of the reserved soil
This is also an important reason why this support method is not widely used.

Method used

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  • Construction method of foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support
  • Construction method of foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support
  • Construction method of foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The foundation pit support structure of the anti-pressure cable-stayed bracing combined type of left soil includes a cable-stay system, a crown beam 2, a water-stop enclosure body 7, a soil-retaining area 8, a steel concrete floor-26 and an excavation area The top of the water-stop enclosure 7 is provided with a crown beam 2, and a connection reinforcement cage 6 is provided between the crown beam 2 and the water-stop enclosure 7, and the crown beam 2 is arranged in the original soil layer 1, so The soil retention area 8 is set between the water stop enclosure 7 and the excavation area, the side of the steel concrete bottom plate 26 is provided with a connection ear plate 5 25, and the steel concrete bottom plate 1 26 is arranged at the bottom 35 of the foundation pit, The cable stay system includes a reserved anchor hole 3, an upwardly inclined anchor 4, a downwardly inclined anchor 5, a support 9, an anchor head 10, a connecting ear plate 11, a stay cable 12, a connect...

Embodiment 2

[0057] The construction method of the foundation pit support structure of the described back pressure cable-stayed bracing combined type of left soil comprises the following steps:

[0058] 1) if image 3 As shown, the construction of the water-stop enclosure 7 and the crown beam 2: According to the engineering design, the concrete mixing pile construction is carried out around the pre-excavated foundation pit. Concrete pouring is carried out to form the water-stop enclosure 7 of the foundation pit, and then the connecting reinforcement cage 6 on the top of the water-stop enclosure 7 is lapped to bind the steel bars, and two upper and lower anchor holes 3 are reserved, and finally Pour concrete to form the crown beam 2 integrated with the waterstop enclosure 7;

[0059] 2) Excavation construction in excavation area 127: after the construction of waterstop enclosure 7 and crown beam 2 is completed, then excavate the earth in excavation area 127 within the scope of the foundati...

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Abstract

The invention relates to a construction method of a foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support. The construction method comprises the steps that (1) a water stop enclosure body and a top beam are constructed; (2) excavation construction is conducted on a first excavation area; (3) upper inclined anchor rods, lower inclined anchor rods and supports are installed and constructed; (4) excavation construction is conducted on a second excavation area; (5) primary driving construction is carried out on first steel sheet piles; (6) stay cable is installed; (7) excavation construction is conducted on a third excavation area; (8) a second steel sheet pile is driven and a first recyclable anchor rod is installed and constructed; (9) a fourth excavation area is excavated and a second recyclable anchor rod is installed and constructed; (10) a first reinforced concrete bottom plate is constructed; (11) a first inclined strut is installed and constructed; (12) a fifth excavation area is excavated and a second inclined strut is installed and constructed; and (13) excavation construction is carried out on a sixth excavation area. The construction method of the foundation pit supporting structure combining soil retaining, back pressure and cable-stayed support has the beneficial effects that a stacked steel sheet pile structure with a cable-stayed supporting system for resisting lateral displacement is arranged on the outer side of a soil retaining area, so that the soil retaining area has the advantages of being small in occupied space, large in lateral displacement resisting rigidity and high in stability.

Description

technical field [0001] The invention relates to the technical field of foundation pit support, in particular to a construction method for a foundation pit support structure of a back pressure cable-stayed bracing combined type. Background technique [0002] With the development of society, urban land resources are scarce, and the full use of land resources has become a key topic that must be considered in engineering construction. After the limitation of upward development space, how to develop underground has promoted the rapid rise of foundation pit support engineering. With its rise, the safety and reasonableness of foundation pit excavation will test the type selection of support structures. It is an effective method to reduce the displacement and internal force of the support structure by using reserved back pressure soil when excavating the foundation pit. It is not widely used in our country at present. Compared with other support forms, it saves a lot of foundation...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/04E02D5/16E02D5/76
CPCE02D17/04E02D5/04E02D5/16E02D5/76
Inventor 王新泉徐化新齐昌广刁红国
Owner ZHEJIANG UNIV CITY COLLEGE