Construction method of bagged rammed small-diameter soil-cement pile composite foundation

A technology for cement-soil piles and construction methods, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems that the treatment method cannot fully meet the requirements, the depth of the pile body is too deep, and the construction machinery is cumbersome. Overcome the uneven strength, reduce the depth of the soil, the effect of fast construction

Inactive Publication Date: 2010-12-01
HOHAI UNIV
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Problems solved by technology

According to the characteristics of the soft soil foundation in small sites, the large-scale soft foundation treatment method cannot fully meet the requirements, and the pile body is too deep into the soil (generally penetrates through the soft soil layer), the pile diameter is large (600-1000mm), and the con

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  • Construction method of bagged rammed small-diameter soil-cement pile composite foundation
  • Construction method of bagged rammed small-diameter soil-cement pile composite foundation

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[0018] Examples:

[0019] The specific construction steps of the composite foundation construction method of bagged compacted small-diameter cement-soil piles are described below in conjunction with the attached drawings:

[0020] (1) Pre-drilling by drilling machine: ①According to the site characteristics and building form, determine the soft soil foundation reinforcement depth to be 7m, the pile spacing is 600mm, and the triangular arrangement; ②The Luoyang shovel is used to make the hole, and the hole is drilled to a predetermined depth of 7m and a diameter of 130mm. Complete the hole forming process 1 of the pile machine; ③After the hole is formed, the drill rod shall not be raised temporarily to prevent the hole wall from shrinking and closing

[0021] (2) Geotechnical pipe bag layout: ①Making a 7.5m long geotechnical pipe bag greater than the hole depth 0.5m, with a pipe bag diameter of 160mm; ②Using the Luoyang shovel drill pipe guide to insert the geotechnical pipe bag into t...

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Abstract

The invention relates to a construction method of a bagged rammed small-diameter soil-cement pile composite foundation in a small-area weak and deep soft soil layer. The construction method is characterized in that a small-diameter soil engineering pipe bag is combined with the traditional soil-cement pile processing method to extrude surrounding soil bodies to be dense in a limiting way by utilizing the gluing reinforcement of cement and the restraint action of the soil engineering pipe bag so as to form high-density minitype pile group effect and enhance the bearing capability of the foundation. The diameter of the traditional soil-cement pile and the loss of soil-cement in the foundation are reduced by utilizing the packaging and restricting action of the soil engineering pipe bag, and the embedment depth of a pile body is reduced, thereby the reinforcement effect of a shallow-layer weak field soil composite foundation is achieved. Compared with construction method of the soil-cement pile large-area soft soil foundation, the invention has the advantages of simple process, fast construction, miniaturized construction equipment, material saving and low cost and can be popularized and used in the processing process of a small-area deep and weak field soil foundation.

Description

Technical field [0001] The invention relates to a shallow composite foundation treatment method, in particular to a bag-packed compacted small-diameter cement-soil pile composite foundation construction method for treating deep, thick and weak soil foundations, and belongs to the technical field of geotechnical engineering. Background technique [0002] Due to the soft soil foundation has high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, poor water permeability, complex layered distribution of soil layers, and physical and mechanical properties between layers. Due to the characteristics of large differences, the bearing capacity of the foundation is generally very low, and the overall stability is poor. Therefore, when using such weak foundations, appropriate foundation treatment methods must be adopted in engineering. At present, the most important treatment method for soft soil ...

Claims

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Application Information

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IPC IPC(8): E02D3/08
Inventor 王保田郭帅杰张海霞张文慧张福海
Owner HOHAI UNIV
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