A construction method of using a rotary drilling rig to construct a bored occlusal pile for foundation pit enclosure protection
A technology of drilling occlusal piles and rotary drilling rigs, which is applied in excavation, sheet pile walls, foundation structure engineering, etc., and can solve the problems that mixing piles cannot be constructed, H-beams cannot be inserted, and foundation pit enclosure structures cannot meet the requirements of water stop and weather protection. to improve construction speed, reduce project cost and ensure quality
Active Publication Date: 2019-01-04
ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP
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Problems solved by technology
The original foundation pit enclosure structure was SMW piles. Due to the impact of the riprap at the bottom of the retaining wall, the mixing pile could not be constructed to the rock formation, and the H-shaped steel could not be inserted to the design elevation. The foundation pit enclosure structure could not meet the water stop and force problems.
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[0029] according to figure 1 It can be seen that the construction of occlusal piles adopts the pile jumping method, and every 9 piles is a construction cycle. First, A-type piles (plastic concrete plain piles) are constructed, and when the A-type piles are initially set (about 7 to 9 hours), they are constructed next to the B-type piles. Type pile (reinforced concrete pile), construction sequence: A1→A3→A5→A2→A4→B1→B2→B3→B4.
[0030] Construction method step of the present invention is:
[0031] (1) Construction preparation
[0032] According to the pile position plan and the site reference point, measure and place the pile position on the construction site and drive in obvious marks to ensure the accuracy of the pile position setting and protect the reference point;
[0033] (2) Buried casing
[0034] The inner diameter of the casing is 0.2m larger than the borehole diameter. Excavate the pile hole to the bottom of the casing, and position the casing according to the cente...
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A construction method for construction of foundation pit support bored secant pile walls with a rotary drilling rig comprises the steps of preparation for construction, pile casing embedment, the drilling rig in position, mechanical bore forming, wall brushing, bore cleaning, reinforcement cage machining and hoisting, and concrete pouring. According to the construction method for construction of foundation pit support bored secant pile walls with a rotary drilling rig, all casing drill hole forming is adopted for the bored secant pile walls, and because advanced steel sleeves are used for wall protection all along in the construction process, no slurry is needed for wall protection, the cost of slurry making, using and waste slurry processing is saved, soil which is taken out is natural soil, and civilized construction on a construction site can be done well; and with the method, the construction cost can be reduced, the construction speed can be increased, and the quality of a supporting structure is guaranteed actually.
Description
technical field [0001] The invention relates to a construction method for using a rotary drilling rig to construct a foundation pit enclosure protection borehole occlusal pile. Background technique [0002] The ramp on the east bank of Honggu Tunnel in Nanchang City is adjacent to the Gandong Levee. The levee is a gravity retaining wall, and the bottom of the retaining wall is a riprap stratum. The original foundation pit enclosure structure was SMW piles. Due to the impact of the riprap at the bottom of the retaining wall, the mixing piles could not be constructed to the rock formation, and the H-shaped steel could not be inserted to the design elevation. The foundation pit enclosure structure could not meet the water stop and force problems. Contents of the invention [0003] The object of the present invention is to provide a construction method for using a rotary drilling rig to construct a foundation pit enclosing bored occlusal pile in view of the deficiencies in the...
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IPC IPC(8): E02D5/34E02D5/38E02D5/18E02D17/04E02D15/06
CPCE02D5/18E02D5/34E02D5/38E02D15/06E02D17/04E02D2250/00E02D2300/002
Inventor 李志军郭小龙王秋林董小龙董军张荣华雷明星段杰文姚远曹光云孔祥远羊红艳罗苍宁易定达邢永辉张伟孙超宋本乐彭炎锋叶亮
Owner ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP