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Controllable rigid pile and squeezed gravel pile combined composite foundation and construction method thereof

A composite foundation and rigid pile technology, applied in foundation structure engineering, sheet pile wall, soil protection, etc., can solve the problems of shear sliding deformation, poor foundation stability, etc.

Pending Publication Date: 2020-07-07
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite foundation composed of controllable rigid piles and compacted sandstone piles and its construction method, which can solve the problems of poor stability of existing foundations and easy shearing and sliding deformation.

Method used

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  • Controllable rigid pile and squeezed gravel pile combined composite foundation and construction method thereof
  • Controllable rigid pile and squeezed gravel pile combined composite foundation and construction method thereof
  • Controllable rigid pile and squeezed gravel pile combined composite foundation and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] see figure 1 and figure 2 , a controllable rigid pile 4 and compacted sandstone pile 7 composite foundation in a preferred embodiment of the present invention, including a soft soil foundation 1, a sand cushion layer 2 laid on the soft soil foundation 1, and a sand cushion layer arranged on the sand cushion layer 2 the drainage ditch 3 on the outside;

[0044] A plurality of rigid piles 4 are evenly arranged in the soft soil foundation 1, and the tops of the rigid piles 4 are not higher than the soft soil foundation 1 surface; the rigid piles 4 are provided with sleeves 5, and the sleeves 5 The top end extends upwards to the top surface of the sand cushion 2, and the bottom end of the sleeve 5 shrinks to cover the rigid pile 4;

[0045] The sleeve 5 is respectively connected to the grouting pipeline and the grouting pipeline; the sleeve 5 is injected with cement slurry, and the sleeve 5 is provided with a cover plate 6;

[0046] A plurality of gravel piles 7 are eve...

Embodiment 2

[0056] Taking the soft soil foundation 1 under the embankment 17 as the implementation object, the construction method of the composite foundation combined with the controllable rigid pile 4 and the compacted sandstone pile 7 includes steps:

[0057] (1) Level the site first, pave and fill a sand cushion 2 with a thickness of not less than 500mm on the surface of the soft soil foundation 1, and the outer edge of the sand cushion 2 is connected with the drainage ditch 3;

[0058] (2) Construct sand and gravel piles 7 on the sand cushion 2, vertically, from the shallower part of the soft soil foundation 1 to the deeper construction, and for structures such as bridgeheads or culverts, start from the adjacent structures and move away from the structures. Construction in the direction of the object; in the horizontal direction, the folding line method of left and right back and forth is adopted, and the method of first two sides and then the middle can also be adopted. The design l...

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Abstract

The invention discloses a controllable rigid pile and squeezed gravel pile combined composite foundation and a construction method of the controllable rigid pile and squeezed gravel pile combined composite foundation. The foundation comprises a soft soil foundation, a sand cushion layer laid on the soft soil foundation and a drainage ditch arranged on the outer side of the sand cushion layer. Thesoft soil foundation is internally provided with a plurality of rigid piles. The rigid piles are provided with a sleeve. The top end of the sleeve extends upwards to the top surface of the sand cushion layer. A rigid pile sleeves the contracted bottom end of the sleeve. The sleeve is respectively connected with a slurry injecting pipeline and a slurry discharging pipeline. Cement slurry is injected into the sleeve. A cover plate is arranged on the sleeve. A plurality of gravel piles are uniformly arranged in the sand cushion layer around the cover plate. The top ends of the gravel piles are flush with the top surface of the sand cushion layer. The bottom ends of the gravel piles penetrate through the sand cushion layer and extend into the soft soil layer. The controllable rigid pile and squeezed gravel pile combined composite foundation can enable the maximum and minimum main stress difference and the shear stress of foundation soil to be reduced, and the foundation stability is improved.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to a composite foundation composed of controllable rigid piles and compacted sandstone piles and a construction method thereof. Background technique [0002] Soft soil has the characteristics of high water content, large void ratio, poor permeability and low shear strength. Composite foundation technology is often used in engineering to reinforce soft soil foundations to improve the bearing capacity and stability of soft soil foundations and reduce their settlement and differential settlement. At the same time, the construction period and reinforcement costs of composite foundations are also critical. [0003] At present, among various reinforcements of composite foundations, rigid piles have high rigidity and high strength, and can transfer pile top loads to deep soil, and have outstanding advantages in bearing capacity and settlement. The properties are not much impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08E02D5/38
CPCE02D3/08E02D5/38
Inventor 周志军伍智荣邓幸儿
Owner WUYI UNIV
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