Rotary excavating pile foundation double-steel-casing construction method
A construction method and technology of steel casings, which can be applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of low construction efficiency of rotary excavation piles and complicated treatment of mud and quicksand, and achieve good mobility and convenience, shorten The effect of small construction period and exciting force
Inactive Publication Date: 2021-01-15
CHONGQING CONSTR NINTH ENG
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Problems solved by technology
[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a double-steel casing construction method for rotary excavation pile foundations to solve the problem of low construction efficiency of rotary excavation piles in high backfill areas and pile holes The complex construction technical problems of bottom silt quicksand treatment
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[0025] The present invention will be described in further detail below by means of specific embodiments:
[0026] The reference signs in the drawings of the description include: outer steel casing 1, inner steel casing 2, positioning hoop 3, inner ring reinforcement 31, outer ring reinforcement 32, connection reinforcement 33, positioning reinforcement 34.
[0027] The embodiment of the present invention proposes a double-steel casing construction method for a rotary excavation pile foundation, comprising the following steps:
[0028] 1. Construction preparation
[0029] Familiar with the requirements of the construction design drawings and specifications, and at the same time, according to the geological survey report and other materials, understand the soil quality of the land where the pile foundation is located, whether there are underground pipelines, the depth of groundwater, the estimated buried depth of the foundation, etc., and prepare a targeted construction plan. R...
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The invention discloses a rotary excavating pile foundation double-steel-casing construction method. The rotary excavating pile foundation double-steel-casing construction method comprises the following steps that step 1, positioning and setting-out are constructed on site according to a construction drawing, a measuring grid is established, and points are measured and set out; step 2, after the position is adjusted, a guide hole is excavated; step 3, whether the pile position is consistent with the center of an outer steel casing or not is checked, the periphery of the outer steel casing is filled with soil and tamped after correction, and the outer steel casing is sunken to the height H1 through a crawler-type vibratory hammer; step 4, a positioning hoop is installed at an orifice of theouter steel casing, and then the crawler-type vibratory hammer is adopted to enable an inner steel casing to sink from the interior of the positioning hoop and penetrate through the outer steel casing to reach a dense soil layer or a strong weathered layer; step 5, a hole is formed through drilling, the hole is cleaned, and a reinforcement cage is installed; and step 6, concrete is poured, and the inner steel casing and the outer steel casing are pulled out. Compared with the prior art, the construction efficiency of the rotary excavating pile in the high backfill area is improved, and the processing quality and economic benefits of a pile foundation are improved.
Description
technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a double-steel casing construction method for rotary excavation pile foundations. Background technique [0002] In the current domestic construction projects, the rotary-dug hole-forming cast-in-situ pile is widely used. It has the advantages of fast hole-forming speed, high safety factor, and high degree of mechanical automation. According to different wall protection forms, the rotary-dug pile can be divided into dry-hole operation method , mud wall protection method, steel casing wall protection method and a full set of steel casing follow-up method. [0003] For some areas with high backfill and complex geological conditions, the above-mentioned traditional pile foundation construction method has the problems of low construction efficiency of rotary excavation piles in high backfill areas, and complicated construction technology problems of mud and quicks...
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IPC IPC(8): E02D5/38E02D11/00E02D7/18E02D5/66
CPCE02D5/385E02D5/665E02D7/18E02D11/00E02D2250/0007E02D2250/0023
Inventor 黄章建
Owner CHONGQING CONSTR NINTH ENG
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