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Bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation construction method

A technology for prestressed pipe piles and composite foundations, which is used in infrastructure engineering, sheet pile walls, buildings, etc., and can solve the problem that the treatment method of large-scale weak foundation cannot fully meet the requirements, the depth of the pile body is too deep, and the construction machinery is cumbersome. Field and other problems, to achieve the effect of convenient pile quality inspection, reduction of post-construction settlement, and guaranteed pile quality

Inactive Publication Date: 2010-12-01
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0003] According to the characteristics of the soft soil foundation in small sites, the large-scale soft foundation treatment method cannot fully meet the requirements, the pile body is too deep into the soil (generally penetrates the soft soil layer), the pile diameter is large (600-1000mm), and heavy construction machinery is difficult to enter the site , the construction process is complicated, the cost is relatively high, etc., so the composite foundation reinforcement treatment for the weak foundation of the small site, this kind of traditional composite foundation construction method has certain disadvantages

Method used

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Embodiment

[0020] The specific construction steps of the construction method of the small-diameter prestressed pipe pile composite foundation by grouting and expanding the bottom are further described below in conjunction with the attached drawings:

[0021] (1) Pile sinking in place by a small pile driving machine: ① According to the characteristics of the site soil and the form of the building, the reinforcement depth of the weak soil foundation is determined to be 6.0m, and the prefabricated pipe pile length is 6.0m, the outer diameter is 150mm, and the wall thickness is 50mm; ② Luoyang shovel Prefabricated holes with a diameter of 90mm and a depth of 4.0m to reduce the difficulty of driving prefabricated tubular piles;

[0022] (2) Preparation of grout for grouting: ① Use No. 42.5 clot-free, non-damp ordinary Portland cement or slag cement; ② Dry cement and non-polluted water are prepared according to the designed water-cement ratio to achieve fluidity with a water-cement ratio of 2.0...

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Abstract

The invention discloses a bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation construction method for processing a small-area / narrow-range deep mucky soil or soft clay foundation, which is characterized in that: by utilizing the high bearing capacity and pile-bottom concrete reinforced and enlarged ends of bottom-grouting-enlarged small-diameter prestressed tubular piles, the bottom-grouting-enlarged small-diameter prestressed tubular piles effectively reduce diameters of pile bodies of the conventional prestressed tubular piles, reduce the buried depths of the pile bodies, and are arranged in a plane at a proper pile spacing to achieve micro shallow and dense pile group effect and achieve shallow soft field soil composite foundation reinforcement effect. The method has the advantages that: on bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation, the small-diameter prestressed tubular piles are used to compact the surrounding soil to transfer load, and grouting and reinforcement of pile bottoms are performed to improve the end bearing capacity, so that a shallow pile-based composite foundation is formed. Compared with a normal large-area soft soil foundation composite foundation processing method and a prestressed tubular pile foundation method, the method has the characteristics of simple process, high construction speed, miniature construction equipment, material saving and low cost.

Description

Technical field [0001] The invention relates to a shallow composite foundation treatment method, in particular to a grouting bottom expansion small-diameter prestressed pipe pile composite foundation construction method for treating weak, deep and thick soft soil foundations, and belongs to the 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, layered distribution of soil layers, and differences in physical and mechanical properties between layers. Because of the large characteristics, the foundation bearing capacity 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 main treatment method for soft soil foundation is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/12E02D5/44
Inventor 郭帅杰王保田张海霞张文慧张福海
Owner HOHAI UNIV
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