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Cross-shaped steel pipe combined pile with dual functions of bearing and draining

A dual-function, combined pile technology, used in sheet pile walls, soil protection, construction, etc., can solve the problems of not being able to be used as a vertical drainage channel, soft clay can not be used for drainage and consolidation, etc. The effect of drainage capacity, reduction of construction steps, and increase of stressed area

Inactive Publication Date: 2020-07-03
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, steel pipe piles cannot be used as vertical drainage channels to provide vertical drainage conditions, so they cannot play a drainage and consolidation role for soft clay

Method used

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  • Cross-shaped steel pipe combined pile with dual functions of bearing and draining
  • Cross-shaped steel pipe combined pile with dual functions of bearing and draining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Silt foundation with standard penetration number N=0-1.

[0017] The diameter of the main steel pipe of the cross-shaped steel pipe composite pile is 2.0m, the wall thickness of the steel pipe pile is 25mm, the width of the steel support plate is 2.0m, the wall thickness of the steel support plate is 20mm, and the width of the plastic drainage composite material is 1.8m. 20×10 -3 cm / s, and the pile spacing of cross-shaped steel pipe composite piles is 8.0m.

[0018] The 30m-long cross-shaped steel pipe composite pile with dual functions of bearing and drainage is installed by a piling ship. The 125-type piling hammer is used. The maximum stroke of the hammering part is 2100mm, and the hammering frequency is 45-50 times / min until the cross-shaped steel pipe combination The piles go into the designated position, and the installation is finally completed.

Embodiment 2

[0020] Soft soil foundation with standard penetration number N=2-5.

[0021] The diameter of the main steel pipe of the cross-shaped steel pipe composite pile is 1.0m, the wall thickness of the steel pipe pile is 20mm, the width of the steel support plate is 2.0m, the wall thickness of the steel support plate is 15mm, and the width of the plastic drainage composite material is 0.8m. 10×10 -3 cm / s, and the pile spacing of cross-shaped steel pipe composite piles is 4.0m.

[0022] The 30m-long cross-shaped steel pipe composite pile with dual functions of bearing and drainage is installed by a piling ship. The 125-type piling hammer is used. The maximum stroke of the hammering part is 2500mm, and the hammering frequency is 40-45 times / min until the cross-shaped steel pipe combination The piles go into the designated position, and the installation is finally completed.

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Abstract

The invention discloses a cross-shaped steel pipe combined pile with dual functions of bearing and draining, and belongs to the field of geotechnical engineering. The steel pipe combined pile comprises a main steel pipe, steel support rods, and plastic drainage composite materials on two surfaces of each steel support rod. The main steel pipe is located in the middle and is welded and connected tothe 4 steel support rods on the periphery, and the steel support rods and the plastic drainage composite materials are bonded by a high-strength structural adhesive. A drainage channel is provided through the plastic drainage composite materials, the solidification of soft soil can be accelerated under the overload action, and the cross-shaped steel pipe combined pile has the functions of a plastic drainage plate and a sand pile. Moreover, the contact area between the pile and a soil body is increased by the 4 steel support rods, particularly the side resistance of the friction type pile canbe exerted, and the vertical and horizontal bearing capacity can be improved. The cross-shaped steel pipe combined pile can be combined with a caisson or a jacket to be used as a foundation or groundreinforcement measure of a deep sea soft foundation bridge and an ocean platform.

Description

technical field [0001] The invention belongs to the technical field of pile foundation engineering, in particular to the field of marine engineering or sea-crossing bridge foundation engineering, and relates to a cross-shaped steel pipe composite pile with dual functions of bearing and drainage. Background technique [0002] For the treatment of marine engineering soft ground with a water depth of more than 50m~100m, the existing soft ground treatment schemes mostly have restrictions on the water depth used by construction equipment, and it is difficult for existing equipment to reach such a deep depth. Steel pipe pile foundations are widely used in offshore platforms and sea-crossing bridges. However, for deep soft clay soil conditions, the main stress mode of steel pipe piles is the force of friction piles, relying on the side wall resistance to resist vertical loads. The contact area is proportional to the diameter, and the contact area inside the steel pipe pile does no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/24E02D5/28E02D3/10
CPCE02D5/24E02D5/28E02D5/285E02D3/10E02D2300/0029E02D2300/0006
Inventor 刘兴华武思宇宋伟杰吴梦龙
Owner BEIJING ZHONGYAN DADI TECH CO LTD
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