Construction method of a large-diameter gravel pile

Abstract

The invention provides a construction method of a large-diameter crushed stone pile. The construction method comprises the following construction steps of: cleaning miscellaneous fill on the surface layer of a soft foundation; when mountain stones are filled on the surface layer, firstly carrying out punching and hole guiding work and penetrating through a stone filling layer; sinking a large-diameter thin-wall steel sleeve with the outer diameter of 800-1600mm into the soft foundation until the depth reaches to a designed depth; constructing and finishing dry soil taking and hole forming work in the large-diameter thin-wall steel sleeve; matching a water pumping and discharging measure and completely draining water in a drainage hole; filling crushed stones in the hole by layers, and tamping and filling by layers, wherein the thickness for tamping by layers is more than 3m; tamping and filling by layers until the height is 50cm higher than a designed pile top mark height; pulling out the large-diameter thin-wall steel sleeve from the soft foundation; and forming the large-diameter crushed stone pile with the outer diameter of 800-1600mm in the soft foundation. The construction method has the advantages of low requirements on construction equipment, low construction difficulty, controllable quality of the prepared crushed stone pile, high bearing capability of the pile foundation, good water discharging capability and the like; and the prepared crushed stone pile is mainly applied to compound foundation or water discharging solidification treatment of buildings including a stacking field, a road, a large-size steel storage port foundation and the like on a large-area deep and thick soft foundation.

Description

technical field [0001] The present invention relates to a construction method of a large-diameter gravel pile, to be more precise, relates to a construction method of a large-diameter dry soil extraction pipe with dynamic tamping of a gravel pile. The gravel pile is mainly used on a large-area deep soft ground Composite foundation or drainage consolidation treatment of buildings such as storage yards, roads, and large steel storage tank foundations. Background technique [0002] In the treatment of large-area deep soft foundation, gravel pile is a common treatment method, which has the composite effect of drainage channel and foundation vertical reinforcement. The national "Technical Specifications for Building Foundation Treatment" JGJ79-2002 discloses two construction methods of gravel piles: the construction technology of vibrating gravel piles (wet method) and the construction technology of immersed tube gravel piles (dry method). [0003] Conventional sunken gravel pil...

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Problems solved by technology

[0005] Large-diameter piles should be used to treat soft foundations with crushed stone piles. This is mainly due to the low restraint of the soft soil foundation around the piles, and the low bearing capacity of small-diameter piles, which is prone to bulge damage. However, the existing immersed tube compaction construction construction method, it is difficult to construct large-diameter piles, and there is a serious soil squeezing effect; the maximum diameter of the vibro-construction method is only 1200mm, and the vibro-wet construction process has the disadvantages of mud pollution and low pile strength, which limits the gravel piles. Popularization and Application in Treatment of Soft Ground, Especially Super Soft Ground

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