Construction method of long spiral variable diameter concrete pile
A technology of concrete piles and construction methods, which is applied in the direction of sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of large mud discharge, excessive sediment at the bottom of holes, and slow construction speed, so as to achieve good pile quality and reduce engineering costs. Cost and environmental pollution, high efficiency effect
Inactive Publication Date: 2017-01-25
中冶沈勘工程技术有限公司
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Problems solved by technology
Reaming and bottom reaming drilling technology is an important means to improve the bearing capacity of single piles, but the traditional reaming and bottom reaming drilling technology is only suitable for underwater cast-in-situ piles with mechanical holes, and the hole forming and bottom reaming need two times Not only is the construction speed slow, but it is also prone to quality accidents such as diameter shrinkage, hole collapse, underwater pouring broken piles, and sediment at the bottom of the hole exceeding the standard. At the same time, the discharge of mud is large and the pollution is serious.
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[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, which are explanations rather than limitations of the present invention.
[0016] The construction method of a long helical variable-diameter pressure grouting concrete pile of the present invention is applied to the test drilling, pile formation and detection of the prototype pile foundation, and some data are shown in Table 1.
[0017] Such as Figure 4 and Figure 5 As shown, the pile top of the long spiral variable-diameter pressure grouting concrete pile is laid with a 0.3m thick cushion (foundation cushion), and the pile body concrete is poured with C30 superfluid concrete. The diameter and length of the pile body are respectively: diameter d=0.4m, L=8.0m, configure 5 HRB335ø18 main reinforcements, use spiral stirrups HPB235ø6@200, the pile tops and variable diameter places are denser, with a spacing of 100mm; the piles in the cl...
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The invention provides a construction method of long spiral variable diameter concrete pile, comprising the construction using the non rock rooted long spiral super-fluid reaming bit, and hole boring, ream drilling and bottom enlarging construction on pile positions as required by the design; and then the concrete pump is opened, injecting the super-fluid concrete with pressure and lift the drill pipe with continuous guncreting to keep the concrete pumped into the borehole greater than the volume lifted up by the drill pipe; fix the reinforcement cage at the design elevation on the top of pile. The construction method can realize concrete grouting without lifting up the drill pipe, finish drilling, reaming and ream drilling at one time, and greatly reduce the engineering cost and environmental pollution with good pile quality and high working efficiency, having a good social and economic benefit.
Description
technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method for a long spiral variable-diameter pressure grouting concrete pile, which can realize multiple diameter expansion or bottom expansion at any part of the pile body and pile bottom according to the bearing capacity of the stratum. State concrete special-shaped piles. The construction method of the invention is suitable for soft soil foundation treatment requiring higher bearing capacity characteristic value and pile foundation construction with higher bearing capacity. Background technique [0002] Environmental protection, special shape, and high bearing capacity are the development trends of pile foundations and construction methods today, and have an important impact on the application of pile foundations in soft soil foundation treatment, composite foundation construction, and slope support management. Long spiral superfluid ...
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IPC IPC(8): E02D5/36E02D15/04
CPCE02D5/36E02D15/04
Inventor 刘伟何经纬董天文董雪峰王延昭金佳旭杨懿涵王士祥
Owner 中冶沈勘工程技术有限公司