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Mini-pile combined support structure and construction method thereof

A technology of retaining structure and construction method, which is applied in the direction of foundation structure engineering, excavation, construction, etc., can solve the problems of small flexural rigidity of mini piles and inability to expand the construction of enclosure piles, etc., and achieve high flexural rigidity and good water stop Effect, the effect of improving the bending resistance

Active Publication Date: 2014-07-02
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite mini-pile for the existing foundation pit protection technology, due to the limitation of the construction site around the foundation pit, the construction of traditional protection piles cannot be carried out, and the bending stiffness of ordinary mini-pile is small. Support structure and construction method

Method used

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  • Mini-pile combined support structure and construction method thereof
  • Mini-pile combined support structure and construction method thereof

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Embodiment 1

[0039]Such as figure 1 , figure 2 As shown, the mini-pile composite retaining structure of the present invention includes a crown beam 1, a mini-pile 2, a stirring pile 3 and a grouting anchor rod 4, and the crown beam 1 is composed of a crown beam stirrup 11 and a crown beam longitudinal reinforcement 12. Two mini-pile vertical reinforcing bars 21 and a mini-pile steel pipe 24 are symmetrically arranged along the pile center in the mini-pile 2, and the distance between the two mini-pile vertical reinforcing bars 21 and a mini-pile steel pipe 24 is 0.6- 0.9d, d is the diameter of the mini-pile pile; two mini-pile vertical steel bars 21 and a mini-pile steel pipe 24 are fixed at a 2m interval along the vertical direction with a horizontal steel bar 23, and the vertical steel bars 21 of the mini-pile, the mini-pile steel pipe 24 and the horizontal Reinforcement bar 23 forms reinforcement cage, pours cement mortar 22 on reinforcement cage; Stirring pile 3 is made up of mixing p...

Embodiment 2

[0054] Such as figure 1 , figure 2 As shown, the mini-pile composite retaining structure of the present invention includes a crown beam 1, a mini-pile 2, a stirring pile 3 and a grouting anchor rod 4, and the crown beam 1 is composed of a crown beam stirrup 11 and a crown beam longitudinal reinforcement 12. Two mini-pile vertical reinforcing bars 21 and a mini-pile steel pipe 24 are symmetrically arranged along the pile center in the mini-pile 2, and the distance between the two mini-pile vertical reinforcing bars 21 and a mini-pile steel pipe 24 is 0.6- 0.9d, d is the diameter of the mini-pile pile; two mini-pile vertical steel bars 21 and a mini-pile steel pipe 24 are fixed at a distance of 4 m along the vertical direction with a horizontal steel bar 23, and the vertical steel bars 21 of the mini-pile, the mini-pile steel pipe 24 and the The transverse steel bars 23 form a reinforcement cage on which cement mortar 22 is poured; the mixing pile 3 is composed of a deep mixin...

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Abstract

The invention discloses a mini-pile combined support structure and a construction method thereof. The mini-pile combined support structure comprises a crown beam, a mini pile, a mixing pile and a grouting anchor rod. The mixing pile is connected with the mini pile through the crown beam, and a grouting steel tube is inserted into the mixing pile, so that water stop effect can be realized, and bending resistance of an enclosing structure can be improved. Support points of the enclosing structure are increased by the grouting anchor rod, so that deformation of the enclosing structure can be further controlled.

Description

technical field [0001] The invention relates to the field of ground foundations, in particular to a mini pile composite retaining structure and a construction method. Background technique [0002] In order to reduce the impact of earthwork excavation on the surrounding environment, reinforced concrete retaining piles are widely used in foundation pit engineering and slope engineering. When supporting the retaining soil, its flexural rigidity is relatively limited, so it is difficult to effectively control the displacement of the pile top. For example, large-diameter piles or even double-row piles are used to increase the bending resistance, which will naturally bring about a substantial increase in project cost, but the strength performance of the pile body has not been fully utilized. On the other hand, the development and utilization of urban underground space will also be limited by the conditions of the construction site. These factors have challenged the traditional r...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D17/20
Inventor 俞峰刘念武刘伟国
Owner ZHEJIANG SCI-TECH UNIV
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