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Explosion-enlarging stake construction process

A construction technology and blasting expansion technology, applied in sheet pile wall, foundation structure engineering, construction and other directions, can solve the problems of affecting the stability of soil around the first blasting pile, failing to meet the design requirements, and poor forming quality of the pile, etc. Achieve good soil compaction effect, improve process quality and bearing capacity, and improve the effect of bearing capacity

Inactive Publication Date: 2008-10-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of explosive expansion pile technology is very prone to problems such as pile hole wall collapse and necking during the construction process. The soil cracks develop and the amount of rebound is large, which not only results in poor pile forming quality, but also greatly affects the bearing capacity of the pile foundation. force, even cannot meet the design requirements
In addition, piles and pile heads are usually exploded and expanded twice, and the pile head exploded later not only affects the stability of the soil around the first blasted pile, but also the construction technology is more complicated

Method used

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  • Explosion-enlarging stake construction process

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Embodiment Construction

[0008] Below in conjunction with accompanying drawing, one embodiment of the present invention is further described:

[0009] According to the blasting and expanding pile construction technology of the present invention, blasting parameters are set according to the actual situation on site, and the required aperture, hole depth, charge diameter, charge amount, concrete dosage and detonation time are determined. In order to avoid the blasting funnel being formed near the pile head during blast expansion, a bell-shaped well head 2 is dug out in the soil layer 1 at the pile head position before blast expansion. A blast hole 3 with a diameter of 100mm to 300mm is drilled in the center of the wellhead 2, and the set concentrated charge 4 is placed at the bottom of the blast hole. Then, a thin-walled plastic tube 5 with an inner diameter of 25mm to 40mm is positioned in the center of the blast hole 3, and then a strip-shaped drug pack 6 with a diameter of 25mm to 38mm is put into th...

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PUM

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Abstract

The invention relates to a method for constructing explosive-forming pile, which comprises: first, digging one horn well mouth at the soil; then at the center of well mouth, downwards drilling vertical tile hole to preset depth; arranging integrated drug pack into hole bottom; arranging sleeve at the center of borehole; filling bar drug pack into sleeve; filling mixed concrete or cement sand pulp between the borehole and sleeve; covering steel plate at the open of borehole; stacking carrier matter on the steel plate; exploding the drug pack and bar drug pack, after 3-8 hours when the filled concrete or cement sand pulp are poured, to form tile post and tile head with concrete protective layer; pouring concrete into tile head and tile post to form explosive-forming pile. The invention has simple process and better forming effect without reducing radius and sink hole.

Description

technical field [0001] The invention relates to a construction technique for blasting and expanding piles, which is especially suitable for pile foundation construction in cohesive soil, and also suitable for pile foundation construction in loose soil layer and pile foundation construction under complex terrain conditions. Background technique [0002] It is a well-known technology at home and abroad to use the explosive energy of explosives to extrude the soil in the compressible soil layer to form the foundation of the detonation-expanded pile. The traditional blasting and expanding pile foundation technology is to use manual or mechanical methods to drill the blasthole at the place where the foundation is to be built. The ring-shaped charge bag is detonated to form a pot-shaped pile head, and finally concrete is poured or steel bars are laid in the hole to form a pile foundation. This explosion-expanding pile technology is prone to problems such as collapse and necking o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/44
Inventor 邵鹏贺永年张勇王东权吴晓锁刘春荣朱玉晓陈坤福
Owner CHINA UNIV OF MINING & TECH
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