Filling pile double-pile-casing construction technology

Abstract

The invention discloses a filling pile double-pile-casing construction technology. The filling pile double-pile-casing construction technology comprises the following steps that step 1, an outer pile-casing is mounted, and the lower end of the outer pile-casing is located at 4-5 m of a sand layer; step 2, an inner pile-casing is coaxially mounted in the outer pile-casing, and the lower end of theinner pile-casing is located at 2-3 m of a medium-hard rock layer; step 3, the inner pile-casing is filled with mortar, tamping and still standing are conducted, and thus a mortar layer is obtained, wherein the height of the mortar layer is 1-2 m; steps 4, drilling is continued through the mortar layer until a built-up hole is formed; after mounting of the outer pile-casing ends, wall protection treatment is conducted on the outer pile-casing, the specific method of the wall protection treatment is that drilling slag and seawater in the outer pile-casing are removed, then fresh water is addedinto the outer pile-casing, and after that bentonite is added and stirred till the bentonite is evenly mixed with the fresh water, wherein the total mass of the bentonite is 0.2 times of that of the fresh water. According to the filling pile double-pile-casing construction technology, the inner pile-casing and the outer pile-casing are arranged, thus the problem of mortar leakage of the pile-casing is effectively alleviated, meanwhile the inner pile-casing is filled with the mortar, and thus the effect of mortar leakage prevention is further improved.

Description

technical field [0001] The invention relates to the technical field of cast-in-place pile construction. More specifically, the present invention relates to a double-casing construction technique for cast-in-place piles in shallow overburden layers. Background technique [0002] With the advancement of my country's urbanization process, the demand for construction of ports, highways and bridges in coastal areas is increasing day by day. The construction of cast-in-place piles above water generally adopts the construction technology of steel casing, but if the covering layer at the construction site is shallow and the depth of the steel casing is not deep enough, it is easy to cause grout leakage. At present, by following up the casing while punching holes, pouring mortar or using Concrete is used to block the grout leaking place, which cannot solve the grout leaking problem of the casing well. Contents of the invention [0003] It is an object of the present invention to ...

AI Technical Summary

Problems solved by technology

The construction of cast-in-place piles above water generally adopts the construction technology of steel casing, but if the covering layer at the construction site is shallow and the depth of the steel casing is not deep enough, it is easy to cause grout leakage. At present, by following up the casing while punching holes, pouring mortar or using Concrete is used to seal the grout leakage, which cannot solve the grout leakage problem of the casing well.

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