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

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...

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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

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