Device for negative friction resistance reduction and positive friction resistance transmission of precast pile and using method

A technology of negative friction resistance and prefabricated piles, which is applied in the direction of sheet pile wall, foundation structure test, construction, etc. Friction resistance, economic waste and other issues

Active Publication Date: 2021-01-12
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the negative frictional resistance on the pile side can be reduced, the length of the card slot is still determined, the distribution of the negative frictional resistance of the pile body, the matching of the resistance and the card slot are difficult to determine, and the installation of devices

Method used

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  • Device for negative friction resistance reduction and positive friction resistance transmission of precast pile and using method
  • Device for negative friction resistance reduction and positive friction resistance transmission of precast pile and using method
  • Device for negative friction resistance reduction and positive friction resistance transmission of precast pile and using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] It is known that the composite foundation adopts prefabricated tubular pile foundation, rock-socketed piles, diameter 400mm, length 24m, pile spacing 1.5m, upper load 150kPa, pile-soil stress ratio n=8, groundwater is located 1.0m below the ground.

[0101] Parameters of deep soft soil layer: thickness 10m, gravity γ s =18kN / m 2 , saturation gravity γ sat =19.2kN / m 2 , internal friction angle φ=10°, compression modulus E s = 3MPa.

[0102] calculation steps:

[0103] (1) Earth pressure on pile top plane

[0104]

[0105]

[0106] (2) Ultimate frictional resistance and plastic zone of pile side

[0107] At the top of the pile: τ u1 =0.6×(10+86.8tan10)=15.2kPa

[0108] z=1.2m, τ u2 =0.6×(10+65.6tan10)=12.9kPa

[0109]

[0110] That is, the depth of the plastic zone is 1.2m, and the limit value of negative friction resistance is 14.1kPa.

[0111] When the depth z=5.2m, σ sz ≥0.2σ cz

[0112]

[0113] The elastic zone is 1.2m to 5.2m deep and 4m lo...

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PUM

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Abstract

The invention discloses a device for negative friction resistance reduction and positive friction resistance transmission of a precast pile and a using method. The device comprises a first fixing part, a degradable disordered wire laminated fiberboard and a second fixing part which are sequentially arranged on the outer side of the precast pile from top to bottom; the first fixing part and the second fixing part are each provided with a cavity, the two cavities are connected through a sliding connecting rod, sliding parts are arranged at the two ends of the sliding connecting rod, and the sliding parts are limited in the cavities to slide up and down; and a porous permeation plate is arranged on the outer side of the degradable disordered filament laminated fiberboard and used for wrappingand fixing the degradable disordered filament laminated fiberboard to the outer side of the precast pile. The device and the method have the advantages that an existing precast pile foundation construction technology is enriched, and the device capable of reducing negative friction resistance of the precast pile and a use technology are developed; and by means of the degradable disordered filament laminated fiberboard, slippage is promoted, the negative friction resistance is further reduced, and the non-pollution and degradable effects are achieved.

Description

technical field [0001] The invention relates to a device for negative friction resistance reduction and positive friction resistance transmission of prefabricated piles and a use method thereof, belonging to the technical field of civil engineering prefabricated pile foundations. Background technique [0002] Due to the development of urban construction and the increasing expansion of civil engineering, engineering construction has gradually extended to the suburbs of cities and areas with poor soil quality. Unfavorable soil such as newly filled soil layer, under-consolidated soil layer, deep soft soil layer, collapsible loess, large-area piled on the side of the pile top, groundwater level drop, permafrost thawing and other factors will cause soil self-compression If the amount is relatively large, pile foundations are often used in such bad soil layers. When the soil compressive settlement is greater than the load-bearing pile sinking, negative friction resistance will be...

Claims

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Application Information

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IPC IPC(8): E02D5/24E02D33/00
CPCE02D5/24E02D33/00
Inventor 徐奋强李庆辉
Owner NANJING INST OF TECH
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