Method and system for water and gas combined sand settling prevention for vibroflotation gravel

Abstract

The invention discloses a method and a system for water and gas combined sand settling prevention for a vibroflotation gravel pile machine. A guide rod of a drill rod system of the vibroflotation gravel pile machine is a telescopic guide rod. The method comprises the following steps of when the vibroflotation gravel pile machine performs the ultra-deep construction of a vibroflotation device, gradually extending or retracting the telescopic guide rod in a pile hole along with the increase or decrease of the vibroflotation depth, so as to enable the vibroflotation device under the telescopic guide rod to perform upward vibroflotation for hole forming or upward densification for pile manufacturing; when the telescopic guide rod is retracted or extended, continuously filling water into the telescopic guide rod, and filling pressure water into the telescopic guide rod; enabling the water pressure in the telescopic guide rod to be always higher than the water pressure of the pile hole, and then enabling the pressure water in the telescopic guide rod to flow to mud in the pile hole through a sleeve pipe gap of the telescopic guide rod, so as to prevent the sand in the mud from entering and clamping in the sleeve pipe gap; continuously injecting air into the telescopic guide rod, blowing the sand in the telescopic guide rod from bottom to top, and enabling the sand to btar in the pipe, so as to prevent the sand settling in the pipe.

Description

technical field [0001] The invention relates to the technical field of foundation engineering construction, in particular to a method and system for preventing sand settling through water-gas linkage for vibrating gravel. Background technique [0002] In the soft soil foundation reinforcement treatment project, the vibratory crushed stone pile technology has been widely used due to its advantages of outstanding construction quality, simple construction process, low construction cost, and wide source of filling materials. Especially in earthquake-prone areas, vibro-shock gravel pile reinforcement technology has become the preferred technology for designers because of its anti-liquefaction and outstanding seismic performance of the formed composite foundation. [0003] In essence, the vibroflotation method uses water with higher pressure in the sand, gravel, and soil layers, and sometimes pebbles or gravel are added for replacement. Therefore, the hole is always in a state of ...

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Problems solved by technology

[0004] However, since the telescopic guide rod is composed of multi-section guide rods and works in the state of mixing gravel, sand, and mud, once the mud and the sand and gravel therein enter the gap between the inner and outer guide rods, the telescopic guide rod will If the guide rod is stuck, the vibro impactor will be buried in the hole, causing the construction failure of the vibro impact gravel pile and causing huge losses

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