Prewhirl spray auxiliary pile sinking construction method

Abstract

This invention discloses a method of assistant stake sinking by revolving spray, in this method we ensure the thickness of underground revolving spray before stake sinking, and use revolving spray to drill to move to the resistance layer of stake sinking in stake sinking point, then pass syrup liquid to the drill pole to carry the head of spray using the high pressure pump, with the high pressure level shoot to flow to spray to go in to resistance layer with jet pressure above 30 Mpas, at the same time the drill pole revolving at 15-30 r / min, promoting with 15-30 cm / min speed, to the resistance layer of underground sinking stake to harass revolving spray, then using the sinking stake equipments. The method of the invention avoided taking the soil from top to bottom in the beginning from the natural horizon, lowering resistance of sinking, raised sinking speed and protected stake body, increased the side rub resistance of the stake after the formation of stake. The invention is applicable to the processing of preparing stake used in underground stake sinking resistance layer in engineering construction.

Description

technical field [0001] The invention relates to a foundation treatment construction method, in particular to a pre-spinning assisted pile sinking construction method adopted when the pile sinking is difficult in the construction of a prefabricated pile foundation project. Background technique [0002] In the construction of prefabricated pile foundation engineering, hammering pile sinking method and static pressure pile sinking method are generally used for pile sinking. In areas with complex geological conditions, especially piles that need to penetrate hard soil interlayers, silty soil, sand layers, and pebble layers (including reinforced concrete prefabricated square piles, PHC prestressed pipe piles, steel pipe piles, etc.), whether it is Whether it is the hammering pile sinking method or the static pressure pile sinking method, it is very difficult to sink the pile, especially in recent years, the designed pile diameter has become larger and larger, and the pile sinking...

AI Technical Summary

Problems solved by technology

[0013] The problem to be solved by the present invention is that in the construction process of prefabricated pile foundation engineering, in areas with complex geological conditions, especially the underground silt layer, sand layer, and pebble layer that need to penetrate the resistance layer of pile sinking, whether it is hammering pile sinking The method is still the static pressure pile sinking method. The problem of penetration difficulty during pile sinking is to reduce the pile sinking resistance, increase the pile sinking speed, protect the pile body, and increase the lateral friction resistance of the pile after sinking the pile. And provide a kind of pre-spinning assisted pile driving method in the area of ​​underground resistance layer

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