Construction process of underwater churning-driven cast-in-place bored pile by adopting chemical slurry powder to make slurry and protect wall

Abstract

The invention discloses a construction process for an underwater churning-driven cast-in-place bored pile by adopting a chemical slurry powder to make slurry and protect a wall, comprising the following specific operation steps of: 1, making construction preparation, specifically, fully preparing equipment, tools and objects required by construction, flattening and compacting a construction site,cleaning impurities, removing soft soil, measuring and labeling the center of a pile position, and embedding a pile casing; 2, putting a drilling machine in place, moving the drilling machine to the pile casing, conducting installation and adjusting on the drilling machine, making a drill bit to be aligned with the center of the pile position, integrally checking the drilling machine, and removingfaults in time; and 3, conducting wall protection by slurry, specifically, arranging a slurry pool in a construction site. A double-bottom sand bailing drill is used for bailing slag, and through combination with a pump suction reverse circulation hole-cleaning construction process, the hole cleaning speed is high, hole bottom sediment can be effectively controlled, chemical slurry is prepared according to a proportion determined based on the construction site geology and actual conditions, complex geological conditions in water are considered, the wall protecting capacity of the slurry is improved, the hole forming quality is guaranteed, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to an underwater rotary-drilling bored pile using chemical mud powder to make grout and protect the wall construction technology. Background technique [0002] The shoreline adjustment project on the south bank of Tangdao Bay is located on the south bank of Tangdao Bay in Qingdao Development Zone. Tangdao Bay is adjacent to Jiaozhou Bay in the north and Lingshan Bay in the south. The mouth of the bay starts from Yumingzui in the east and ends at Paotaizui in Lingshanwei in the west. This project is composed of four unit projects: seawall revetment project, yacht wharf project, harbor basin channel dredging project and backfilling project behind the seawall. The seawall revetment project includes seawall pile numbers 0+425-0+598, 0+ 686-0+955 plank road project requires offshore construction of 80 bored piles. The coast type of Tangdao Bay is a muddy bedrock coast,...

AI Technical Summary

Problems solved by technology

[0003] Bored pile technology has been widely used in engineering because of its strong adaptability to various soil layers, no soil squeezing effect, no earthquake damage, no noise, and high bearing capacity. It is carried out underwater. For coastal ports, areas with a lot of precipitation, and clay, fill, sand, and gravel sand with abundant groundwater, using traditional bentonite to make slurry has poor wall protection effect, and it is suitable for hole collapse and necking, and the porosity is relatively low. Low and high cost, safe and civilized construction is not suitable for management, and it will also have a certain impact on the progress

The chemical mud powder can be widely used in the mud retaining wall of the rotary drilling bored pile, and the effect is more significant in the geological characteristics of medium sand, fine sand, silt, quicksand and mud. However, in actual use, due to the ratio of the grout The viscosity and viscosity cannot adapt to the changes of the geological structure layer, and the wall retaining effect cannot be guaranteed, resulting in the collapse of the borehole

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