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

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...

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 with no difference above the neutral point along the pile body will lead to economical problems. waste

Or, use grouting bags to lay between the pile and the soil to reduce the negative friction of the pile foundation. This method is suitable for on-site cast-in-place piles, but not for prefabricated piles.

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