Construction method of large-caliber underwater cast-in-place pile for power transmission tower foundation

Abstract

The invention relates to a construction method of tower transmission iron tower foundation large-diameter underwater cast-in-place piles. The method comprises, during mud retaining wall drilling and pile casting, constructing a mud retaining wall, wherein the inside of mud retaining wall forms a pile hole, and coaxially mounting a shaft casing on the ground at the top end of the pile hole. The method comprises the steps of (1) exploring the position of a drift sand layer; (2) mounting the spliced type casing on a steel reinforcement cage of the position where the drift sand layer is formed; (3) mounting steel reinforcement cages; (4) isolating the drift sand layer; (5) performing construction of concrete cast-in-place piles. The construction method of the tower transmission iron tower foundation large-diameter underwater cast-in-place piles is applicable to field processing, economical and practical, guarantees the effect of no influence of the drift sand layer on any process as well as the construction progress. The construction method of the tower transmission iron tower foundation large-diameter underwater cast-in-place piles has the advantage of obviously enhancing construction rapidity, practicality, sociality and economical efficiency.

Description

technical field [0001] The invention belongs to the field of power transmission line foundation construction and building construction, and relates to a construction method for large-caliber underwater concrete pouring piles encountered in quicksand layers using an attached split-type casing, in particular to a construction method for large-caliber underwater concrete pouring piles for transmission iron tower foundations. Background technique [0002] The cast-in-place pile with mud retaining wall is suitable for the geological conditions with high groundwater level. At present, the cast-in-place pile with large aperture (more than one meter) of the iron tower foundation of Tianjin transmission line mostly uses this pile; when the pile encounters a quicksand layer in the borehole, It must be treated. If it is not treated or handled properly, it will cause construction difficulties, affect the overall quality of the pile body, cause excessive pouring of concrete pouring piles,...

AI Technical Summary

Problems solved by technology

[0002] The cast-in-place pile with mud retaining wall is suitable for the geological conditions with high groundwater level. At present, the cast-in-place pile with large aperture (more than one meter) of the iron tower foundation of Tianjin transmission line mostly uses this pile; when the pile encounters a quicksand layer in the borehole, It must be treated. If it is not treated or handled improperly, it will cause construction difficulties, affect the overall quality of the pile body, cause excessive pouring of concrete pouring piles, and easily cause necking and broken piles, which will affect project quality and construction progress.

[0003] At present, most of the quicksand layer is treated by using the hole-filling re-drilling method and full casing construction. The hole-filling and re-drilling method is to fill the quicksand layer with cement and gravel, and then re-drill. The treatment of the quicksand layer is vague, and sometimes it takes more Carry out hole filling and re-drilling for the first time; in the construction of the full casing, if the casing is pulled out after the initial setting, the concrete of the pile body is prone to segregation with the soil, which cannot meet the design requirements of the friction pile. If the casing is lifted while pouring, it will still The erosion and erosion of the cast-in-place concrete by the quicksand layer may also easily cause pile necking and pile breakage. These construction methods have a negative impact on project cost, construction period, and quality.

[0004] After searching, no disclosed technology identical to this patent application was found

Images