Soil-squeezing hole-forming sand drain construction method

Abstract

The invention is applicable to the technical field of soft soil foundation treatment of civil engineering and provides a soil-squeezing hole-forming sand drain construction method. The method includes the steps that a normal circulation system of a drill jig is started when clockwise soil-squeezing drilling is conducted, clear water is injected into a drilled hole, and soil-squeezing hole-forming is conducted until the designed hole depth is reached; normal circulation of a circulating solution of the drill jig is adjusted to reverse circulation, clear water is injected to the drilled hole through a medium-coarse sand hopper when the circulating solution is pumped out, and the level of water in the drilled hole is always kept higher than the underground water plane; meanwhile, medium-coarse sand is poured into the drilled hole so that a drill bit can be buried below the medium-coarse sand; a drill rod is rotated anticlockwise, screwed connection blades in the combined thread soil-squeezing drill bit press the medium-coarse sand out downwards, a valve stopper is opened under pressure, medium-coarse sand and clear water are injected into the drilled hole when the drill jig is lifted slowly, the distance between the top surface of the medium-coarse sand and the top of the drill bit is kept at the set distance h2 all the time, and the level of the water in the drilled hole is kept higher than the underground water plane. The defect that a drainage consolidation method is limited by height is overcome, and the method has the advantage of being remarkable in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment of civil engineering, and in particular relates to a construction method for sand wells formed by squeezing soil and forming holes. Background technique [0002] Drainage consolidation treatment measures are conventional measures to deal with soft soil foundations, mainly including the use of plastic drainage boards, bagged sand wells or sand piles for treatment. , or when the treatment depth is limited (such as deep soft foundation), the drainage consolidation method treatment measures are limited by the height of construction equipment and construction depth, and cannot meet the design requirements for soft soil foundation treatment: plastic drainage boards, bagged sand wells, sand piles The treatment depth is slightly smaller than the height of the construction equipment. The height of the equipment is generally in the range of 20 to 35 meters. Construction cannot be carr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a sand well construction method of squeezing soil to form holes, so as to solve the problem of a substantial increase in processing costs in the prior art when sand well construction is limited by height or depth

Images