Cast-in-place pile construction method adopting pre-reinforcing and then hole forming for easy-to-collapse stratum

Abstract

The invention discloses a cast-in-place pile construction method adopting pre-reinforcing and then hole forming for an easy-to-collapse stratum. The cast-in-place pile construction method comprises the following steps that (1) the hole collapse depth range of a bored pile is confirmed; (2) the soft stratum is reinforced within the hole collapse depth range; and (3) holes are formed according to the normal construction procedures. By means of the cast-in-place pile construction method, the problems that when cast-in-situ bored pile construction is carried out at the position of the soft and weak soil layer prone to suffering from hole collapse, hole forming of a cast-in-place pile is hard, hole collapse is severe, and excessive concrete pouring is severe can be effectively solved, meanwhile, field machines can be reasonably utilized, equipment in and out of the field can be reduced, cost can be reduced, and the construction efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of stratum pre-reinforcement construction engineering before bored piles are formed, in particular to a construction method for pre-reinforced and then bored cast-in-situ piles in easily collapsed strata. Background technique [0002] Domestic urban subway engineering construction is developing very rapidly. In the construction of subway tunnels and stations, the main construction methods include open-cut method, shield method and spray-anchor concealed excavation method. Due to the high safety factor of the open-cut method, it is often used as an urban subway Preferred method for stations. In the construction of the open cut method, the bored pile is the most common form of the enclosure structure of the two-story station. Compared with other pile technologies, the bored pile has a wide range of applications, fast construction speed, low noise, and low noise. The impact caused by the lives of the surroundi...

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned technical solutions still do not solve the problem of poor self-stability in geological conditions, easy to collapse when exposed to water, and relatively loose ground. When the cast-in-situ pile is constructed, it often occurs that the cast-in-place pile is difficult to form holes, the hole is seriously collapsed, and the concrete pouring is seriously oversized. And other issues

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