Construction method of stirring pile and solidifying agent device thereof

Abstract

The invention provides a construction method of a stirring pile as well as a drill rod and a solidifying agent conveying device thereof. Two soil solidifying agents which can mutually react or can be mutually influenced can be respectively sprayed in the working procedures of sinking and lifting in the construction of the same stirring pile; and moreover, solidified soil can still be effectively stirred, so that the strength of the stirring pile is quickly enhanced in a short period, and the requirement of special engineering, such as salvage and disaster relief, on time is met. When the same soil solidifying agent is used, the soil solidifying agent can still be sprayed in the processes of sinking and lifting of a stirring pile machine, the solidified soil is effectively stirred, the construction efficiency of a stirring pile with large diameter can be enhanced, and the construction time is saved by approximately a half. The requirements of different soil layers on the form of the soil solidifying agent in a soft-soil foundation with a crust layer and high water content can be met, and the quality of a pile body is enhanced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a construction method of a stirring pile, a drill pipe and a curing agent delivery device thereof. [0002] Background technique [0003] Mixing pile is one of the effective methods to strengthen soft soil foundation. It sprays liquid (suspension) or powder solidifying agent (such as cement) into the soft soil while drilling with the mixing pile machine, and mixes the soft soil on the spot. It is forced to stir with the curing agent, and through the physical and chemical interaction between the curing agent and the soft soil, a mixing pile with high strength, integrity and good water stability is formed. [0004] Conventional mixing pile construction machinery only has one nozzle, and only one form of soil curing agent can be used during construction. For example, conventional cement-soil mixing piles can only use cement slurry or cement powder, which are called wet meth...

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Problems solved by technology

Therefore, conventional mixing piles cannot use two kinds of soil stabilization agents that will react or affect each other at the same time.

[0005] Since only one nozzle is set, when the nozzle is set on the lower part of the stirring blade (the most commonly used design in engineering), when the stirring pile machine is lifted up, the stirring blade cannot stir the newly sprayed soil curing agent; when the nozzle is set on the upper part of the stirring blade, the stirring pile When the machine sinks, the stirring blades cannot stir the freshly sprayed soil stabilizer

Therefore, the construction process of conventional mixing piles in engineering practice can only be one spraying (soil curing agent) two stirrings, two spraying four stirrings, three spraying six stirrings, etc., that is, the sinking and lifting of the stirring pile machine The grouting can only be carried out once in the two processes mentioned above, which greatly reduces the construction efficiency of the mixing pile and increases the construction time and cost for the large-diameter mixing pile that needs to be sprayed multiple times

[0006] In addition, due to the complexity of engineering geological conditions, the soil layer that needs to be reinforced by mixing piles sometimes has obvious stratification. For example, in a typical situation, the water content of marine soft soil is generally high, so it is suitable to use dry method However, the upper part of the marine soft soil often has a hard shell layer several meters thick. Since the water content of the hard shell layer is generally very low, it is more suitable for the reinforcement of wet mixing piles, while the reinforcement effect of dry mixing piles is very good. Difference

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