High-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof

A thin-walled steel pipe, bearing capacity technology, applied in sheet pile walls, infrastructure engineering, construction, etc., can solve the problems of high risk of steel pipe breaking, no buffer, and inability to ensure anti-corrosion effect.

Inactive Publication Date: 2018-08-10
毕建宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The drop hammer directly hits the spud shoe without cushioning, resulting in a large impact force on the steel pipe, and a high risk of the steel pipe being damaged. The direct impact of the hammer bottom and the spud shoe will also cause damage to the hammer bottom and the spud shoe;
[0008] 2. There is no buffer, and the problem that the steel pipe may be damaged by the lateral expansion of the buffer material during hammering is not considered. This problem is particularly prominent for thin

Method used

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  • High-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof
  • High-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof
  • High-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: A high-bearing-capacity thin-walled steel pipe concrete pile is constructed using a general-purpose internal hammer.

[0065] The top-to-bottom soil layer of the site: about 1m thick miscellaneous fill soil, about 2m thick soft plastic-plastic silty clay, about 5m thick slightly dense, medium dense to dense fine sand, medium sand, Fully weathered mudstone about 2m thick, strongly weathered mudstone about 3m thick, and moderately weathered mudstone below.

[0066] The design adopts thin-walled steel pipe concrete piles with high bearing capacity. The steel pipe is D426*4.2 spiral steel pipe, Q345 material, 12m long, the steel pipe is coated with anti-corrosion coating, the core concrete is C60 self-compacting concrete, and the characteristic value of the compressive bearing capacity is 420 tons.

[0067] The big-headed pile point A with outsourcing steel concrete is used, the maximum outer diameter is 508mm, and the overall height is 0.6m. The anti-expansio...

Embodiment 2

[0078] Embodiment 2: A special internal hammer is used to construct a thin-walled steel pipe concrete pile with high bearing capacity.

[0079] Geological conditions and design requirements are the same as in Embodiment 1.

[0080] The steel pipe 42 of the sleeve 40 has a diameter of 390 mm, a thickness of 5 mm, a length of about 3.5 m, an inner diameter of the ring plate of 350 mm, a base plate thickness of 200 mm, a side wall thickness of 35 mm, and a height of 200 mm; the lower section 34 of the hammer body 30 has a diameter of 280 mm and a height of 300 mm; 32 diameters 330mm, high about 4m, upper section 31 diameters 380mm, high about 1.2m, outer flash along 33 diameters 370mm, high 50mm, hammer body 30 gross weight about 4.5 tons, buffer material 44 adopts the machine oil soil of thickness 100~150mm.

[0081] The pile point adopts the big pile point B, and the connecting steel pipe 21 is a D426*5 spiral steel pipe, made of Q345, and 100mm in height.

Embodiment 3

[0082] Embodiment 3, a special pile machine is used to construct thin-walled steel pipe concrete piles with high bearing capacity.

[0083] The pile driver is a full hydraulic pile driver, the winch 52 is in front, the oil cylinder 53 is behind, the maximum stroke of the piston rod 54 is 1.5m, the hammering frequency corresponding to the stroke 0-1.5m is 15-50 times / min, and the maximum drop of the internal hammer is 3m away.

[0084] Sink the tube throughout. Within the depth range of the pilot hole, it is estimated that the maximum penetration of single click is 100mm.

[0085] Others will not be repeated.

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Abstract

The invention provides a high-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof. An inward-beating method is used for achieving high bearing force, the technology of weakening the pile hole soil is used for solving the problem about the construction efficiency of the inward-beating method, the device is used for solving the problem about buffering and corrosion prevention, and therefore high-bearing-force thin-wall steel tube concrete pile construction has feasibility, the pile forming quality is good, the use amount of steel is small, operation is easy, control is easy, construction efficiency is high, reliable corrosion prevention is formed, durability and the mechanical property are good, and cost performance is high.

Description

technical field [0001] The invention relates to a construction method and device of an engineering pile and an application thereof, and belongs to the technical field of construction. Background technique [0002] The thin-walled steel pipe referred to in the present invention generally refers to a steel pipe with a ratio of diameter to wall thickness greater than 20. The cost of steel pipes determines that only thin-walled steel pipe concrete piles can truly be competitive in the market. [0003] The high bearing capacity referred to in the present invention generally means that the compressive bearing capacity of the thin-walled concrete filled steel pipe pile is not lower than 50% of the design value of the axial compressive bearing capacity of the corresponding short concrete filled steel tube column. For example: the steel pipe is D426*4.2 spiral steel pipe, Q235 material, pouring C50 concrete, load design value / load standard value = 1.3, pile-forming process coefficie...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D5/72E02D7/06
CPCE02D5/38E02D5/72E02D7/06
Inventor 毕建宏
Owner 毕建宏
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