Point-surrounding reinforcements-attacking type large area rock-fill area rotary drilling cast-in-place pile construction technology
A construction technique and a large-area technology, applied in sheet pile walls, foundation structure engineering, buildings, etc., can solve problems such as casing inclination and deformation of long steel casings, and achieve project cost saving, construction period shortening, economic benefits and Obvious effect of social benefit
Inactive Publication Date: 2018-06-22
NO 2 CONSTR GRP CO LTD OF SHANGHAI CONSTR GRP
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Problems solved by technology
[0003] In view of the above-mentioned problems, the technical problem to be solved in the present invention is to provide a construction technique of rotary excavation and hole-forming cast-in-place piles in a large-area rock-filling area surrounded by points and rounds. The long steel casing under the pulling machine is easy to cause deformation of the long steel casing, and the steel casing meets rock filling during the pressing process, causing the casing to tilt; ensure that the rotary drilling rig can form holes in large rock filling areas
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[0050] The pile foundation project of a project located at the junction of a certain road and a certain street in a certain city uses mechanical rotary drilling bored piles, with a total of 1306 piles. There is a rockfill layer with a depth of 4 meters and an area of about 7,700 square meters in the site D of the project. There are about 269 engineering piles in the rockfill layer. After the hole filling pile construction process, the cost and construction period saved are as follows:
[0051] 1. Cost comparison:
[0052] 1.1. Replacement fee: 7700㎡x4mx40 yuan x 2 times = 2.464 million yuan.
[0053]1.2. The construction technology of rotary excavation and hole-forming cast-in-place piles in large-area rockfill areas of "rounding points and circles": 100,000 yuan per shift of down-the-hole drilling rigs.
[0054] This process saves 2.364 million yuan.
[0055] 2. Comparison of construction period:
[0056] 2.1. The construction period for replacement; the rainy season wi...
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The invention discloses a point-surrounding reinforcements-attacking type large area rock-fill area rotary drilling cast-in-place pile construction technology, and relates to the technical field of construction. The point-surrounding reinforcements-attacking type large area rock-fill area rotary drilling cast-in-place pile construction technology includes the steps of laying off of a pile foundation and laying off of peripheral range of a pile casting, disassembly of broken rock-fill with a in-the-hole drill, retest of a pile position, manufacture of a long steel pile casting with a beating puller, retest of the pile position and the long steel pile casting, dry operation hole-forming with a rotary drilling rig and other regular pile foundation construction. According to the point-surrounding reinforcements-attacking type large area rock-fill area rotary drilling cast-in-place pile construction technology, a mass of construction cost can be saved, construction period is shortened to generate less affection for surroundings, and economic benefits and social benefits are obvious.
Description
Technical field: [0001] The invention relates to a construction technology of rotary-dug hole-forming cast-in-situ piles in a large-area rock-filling area with a circle around points, and belongs to the technical field of construction. Background technique: [0002] Existing large-area rockfill areas have low efficiency and waste time when digging holes with large-scale equipment when digging holes for cast-in-situ piles. The accuracy is low, and the strength after pouring is low. The process is complicated. Invention content: [0003] In view of the above-mentioned problems, the technical problem to be solved in the present invention is to provide a construction technique of rotary-dig-forming cast-in-place piles in a large-area rock-filling area with a circle around the point. The long steel casing under the pulling machine is easy to cause deformation of the long steel casing, and the steel casing meets rock filling during the pressing process, causing the casing to ti...
Claims
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Login to View More IPC IPC(8): E02D5/38
CPCE02D5/38
Inventor 衷敬锋彭明龙佘清雅张振礼叶盛安柳俊
Owner NO 2 CONSTR GRP CO LTD OF SHANGHAI CONSTR GRP