Construction method for filling karst cave by using advanced grouting pipe of shield tunneling machine

Abstract

The invention relates to the technical field of tunnel engineering construction, in particular to a construction method for filling a karst cave by using an advanced grouting pipe of a shield tunneling machine. The construction method comprises the following steps that S1, the advanced grouting pipe of the shield tunneling machine is transformed; S2, grouting equipment is selected and used; S3, reinforcement treatment of the grouting equipment is conducted; S4, thick slurry is injected into a soil bin, and the pressure is controlled to be 2.5 bar; S5, phosphoric acid water glass double-liquid slurry is injected into the periphery of a shield body; S6, a drill rod of a drilling machine drills through the advanced grouting pipe; S7, the drilling rod of the drilling machine enters a preset position, and grouting filling is conducted; and S8, the grouting effect is monitored according to the pressure change. The method is compact in pressure maintaining, higher in efficiency and low in construction cost, and has safety and economical efficiency.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, and more specifically relates to a construction method for filling karst caves with advanced grouting pipes of a shield machine. Background technique [0002] With the rapid development of urbanization, life problems such as traffic congestion follow. Therefore, the rapid construction of urban rail transit, shield tunneling is widely used in subway construction due to its safety, efficiency, economy and efficiency. According to the characteristics of shield construction, geological and hydrological conditions affect the construction safety of shield tunneling, especially when there are construction risks such as karst caves in the geology, whether there are karst caves in the geology needs to confirm the size and location of the karst caves through detailed survey. After the site and location are confirmed, the caves will be filled; due to the characteristics of the explor...

AI Technical Summary

Problems solved by technology

According to the characteristics of shield construction, geological and hydrological conditions affect the construction safety of shield tunneling, especially when there are construction risks such as karst caves in the geology. Whether there are karst caves in the geology needs to confirm the size and location of the karst caves through detailed survey. Fill the karst cave after confirming the location; due to the characteristics of the exploration work, no detailed survey work has been done in the inconvenient or missing areas on the ground

After the start of the shield tunneling, it was found that the shield tunneling had been pushed into the untreated karst cave group, and the karst caves were in the lower part of the shield body, and there was a construction risk of the shield machine falling. The construction method of using conventional ground filling for karst cave treatment has The construction risk of the shield machine being covered by the slurry, so it does not have the construction method of using conventional cavern treatment

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