Blasting pile forming method for three-stage bottom expanding composite pile body

A combined pile and pile-forming technology, which is applied in the direction of sheet pile walls, buildings, and foundation structure engineering, can solve the problems of unprotected construction conditions, low strength of cast-in-place concrete, and large loss of end bearing capacity. Reduced construction cost, good concentricity and high precision
CN101135147AInactive Publication Date: 2008-03-05ε‘¨δΊšθ
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ε‘¨δΊšθ
Publication Date
2008-03-05
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The blasting piling process of three-stage under-reamed combined pile stem includes the following steps: 1. immersing immersed tube with metal pile head into hardpan; 2. taking out the metal pile head; 3. forming the lower base space through blasting, drawing the immersed tube to the first designed distance, forming the middle base space through blasting, taking out soil, setting the prefabricated pile stem with steel dowels in the lower end into the immersed tube, pouring the lower base, the middle base and the lower pile stem with concrete; 4. drawing the immersed tube to the second designed distance, forming the upper base space through blasting, and pouring the upper base with concrete; 5. setting the upper prefabricated pile stem with steel dowels in the lower end into the immersed tube, and connecting the steel dowels to the upper base; and 6. withdrawing the immersed tube and pouring cement mortar into gap. The pile has high material strength utilizing rate and low construction cost.
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Description

technical field

[0001] The invention relates to a construction method of building pile foundation engineering, in particular to a pile forming method of a three-stage bottom-expanding combined pile body. It is the preferred construction method for high-rise building multi-level foundation large bearing capacity pile foundation engineering. Background technique

[0002] According to the national standard, the whole body is cast-in-place (that is, the pile body is cast-in-place concrete, and the base is also cast-in-place concrete). The maximum diameter ratio of the base of the expanded bottom pile is limited to 3-3.5, while the immersed tube prefabricated steel concrete expanded bottom pile, this kind of pile It is prefabricated concrete for the pile body and cast-in-place concrete for the base. Obviously, the ratio of 3-3.5 is broken, and generally can reach 3.5-5. Although the bearing capacity is greater, it still cannot meet the needs of the project, especially when the di...

Claims

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