A construction method for clearing holes and reducing sediment thickness of inclined steel pipe piles

Abstract

The invention discloses a construction method and system for hole cleaning and sediment thickness reducing of an inclined steel pipe pile, and relate to the field of pile foundation construction. Themethod includes the following steps of S1, drilling holes through a reverse circulation drilling machine, and starting a gas lifting reverse circulation system to conduct sediment cleaning; S2, conducting sampling in a sediment discharge pipe after clean water flows out of the sediment discharge pipe, meanwhile the sand content of discharge, and stopping the gas lift reverse circulation system when the sand content is measured to be lower than 0.5%; S3, adding an alum or polyacrylamide solution into the inclined steel pipe pile, and starting the reverse circulation drilling machine to make theadded alum or polyacrylamide solution circulate and flow; S4, standing for 2-4 fours, and then starting the gas lift reverse circulation system for thoroughly removing sediments. By means of the method, the influences of hole drilling by means of turbid river water under silty-fine sand and intermediate-fine sand stratum structural conditions can be overcome, the good flatness of a soil insertingsurface is guaranteed, and the pile end bearing capacity is effectively improved.

Description

technical field [0001] The invention relates to the field of pile foundation construction, in particular to a construction method for clearing holes of inclined steel pipe piles and reducing the thickness of sediment. Background technique [0002] With the increasing level of international foundation engineering construction, inclined steel pipe pile foundations have been used more and more in long bridges. When constructing on the silt-fine sand and medium-fine sand stratum structure, after the inclined steel pipe pile is inserted, it is necessary to use a reverse circulation drilling rig to drill the soil and clean the hole. During the drilling and cleaning process, it is not necessary to use mud to protect the wall, but directly use River water for cleaning. The fine particles contained in the river water are not easy to settle in a short time when the water is flowing, but once the hole cleaning is stopped and left for a period of time, the fine particles will settle to...

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Problems solved by technology

[0004] However, this hole cleaning process is often affected by water quality and geological factors, especially when the river water is turbid or under the condition of silt-fine sand and medium-fine sand stratum structure, which contains a large amount of silt-fine sand and medium-fine sand particles, it is often difficult to clean the hole. It is easy to be completely removed. For super-long piles, large-diameter piles, and inclined piles, the traditional hole-clearing process is difficult to meet the construction requirements

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