Novel construction method of strengthening pile for deep soft soil foundation

Abstract

The invention discloses a novel construction method of a strengthening pile for a deep soft soil foundation. A pile body manufactured according to the novel construction method is a composite mesh cylinder draining granular pile. The composite mesh cylinder draining granular pile is divided into three layers in the radial direction, including an inner pile body filler, a middle mesh cylinder and an outer permeable geomembrane. The middle mesh cylinder is formed by meshes made of a modified polyethylene material or a modified polypropylene material in an enclosed mode. The novel construction method takes a traditional gravel pile as the prototype, uses the innovative thinkings that an enclosure is additionally arranged around an earth bagged gravel pile and draining is realized through a drain pipe pile for reference, improves the enclosure measures intensity and the drainage capacity of a granular pile body, reduces the implementation difficulty and the measure cost of the pile body, covers the shortages of the traditional gravel pile and the earth bagged gravel pile, and enhances the advantages of the traditional gravel pile and the earth bagged gravel pile.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation reinforcement, in particular to a construction method of a novel deep and thick soft soil foundation reinforcement pile. Background technique [0002] At present, the reinforcement of soft soil foundations includes the newly built and rebuilt passenger and freight railways, urban railways, intercity railways, high-speed railways, urban rail transit and other rail traffic, highways, expressways, municipal roads and other road traffic, and airports, ports, etc. Reinforce the soft soil foundation of large-scale site projects such as docks, logistics bases, power stations, comprehensive transportation hubs, underground deep foundation pit projects, and wetland landscape reconstruction. [0003] The functions of traditional soft soil foundation reinforcement treatment measures are relatively single, and can be roughly divided into two categories in a sense: one is drainage consolidation te...

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Problems solved by technology

[0003] The functions of traditional soft soil foundation reinforcement treatment measures are relatively single, and can be roughly divided into two categories in a sense: one is drainage consolidation technology, which creates drainage conditions to accelerate and improve the consolidation effect of soft soil, fundamentally Improve the performance of soft soil engineering, such as bagged sand wells, plastic drainage boards, vacuum preloading, etc., but these technical means, except vacuum preloading, have a long consolidation period and slow results, and ultimately improve the bearing capacity of the foundation and The ability to control settlement is very limited, and it is only suitable for the reinforcement of shallower soft soil foundations that do not require high bearing capacity of composite foundations, especially those that do not require high settlement control.

The other is to use the pile reinforcement method to form a composite foundation together with the soil between the piles to improve the comprehensive bearing capacity and settlement control capacity of the foundation. Compaction replacement piles, such as compacted gravel cushion, compacted gravel piles, gray (cement) soil compaction piles, etc.; (2) Flexible piles with better strength and integrity, such as cement-soil mixing piles, rotary grouting piles, CFG (3) Semi-rigid and rigid piles with better strength and integrity, such as plain concrete piles, reinforced concrete piles, etc. This kind of pile reinforcement method has quick results, but it needs to rely on additional stress to affect one or more layers within the depth range. The bearing layer of the natural foundation is good, and the soil between the piles cannot continue to be improved over time, and the reinforcement effect may attenuate in the later stage

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