Drainage positioning grouting segment and construction method thereof

Abstract

The invention discloses a drainage positioning grouting segment and a construction method thereof. The drainage positioning grouting segment comprises a prefabricated segment body and a grouting drainage system, wherein the prefabricated segment body comprises a segment solid body, a prefabricated drill hole and a preset water pressure pore sensor mounting hole; the grouting drainage system comprises a pre-installed valve, a pre-embedded air bag, a grouting drainage guide pipe and a water pressure pore sensor; and when the water pressure collected by the water pressure pore sensor exceeds a segment stress early warning value, the engineering problems such as segment deformation and crack water seepage can be prevented by opening the valve for drainage or by opening the valve for drainage first and then conducting grouting reinforcement. According to the drainage positioning grouting segment and the construction method thereof, the prefabricated drill hole and the pre-embedded groutingdrainage system are adopted, on-site drilling and grouting drainage device mounting on a shield segment are not needed, drainage is conducted directly through the pre-installed valve, grouting is conducted through the pre-embedded grouting drainage guide pipe after the valve is dismounted, prevention and rapid and safe treatment of common engineering problems of the shield segment are achieved, the construction cost is reduced, and the construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of prefabricated segment production in underground shield subway tunnel engineering, in particular to a drainage positioning grouting segment and a construction method thereof. Background technique [0002] In recent years, the construction of subway tunnels in many cities in my country has entered a stage of great development. Statistics show that as of December 31, 2019, a total of 40 cities in mainland my country have opened urban rail transit operating lines, with an operating mileage of 6,730.27 kilometers, and still maintain a rapid growth trend. In 2019, only 968.77 kilometers of new operating lines in mainland China , including 891.83 kilometers of subway. With the large increase of close construction and the continuous disturbance of vibration to the soil around the tunnel during the operation of the subway, the surrounding environment of the tunnel has changed, resulting in deformation and damage o...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: 1. The original waterproof layer of the segment is easily damaged during the drilling process, which threatens the durability of the segment and adversely affects the tunnel and the surrounding environment; 2. There are many construction links on site, It is difficult to deal with emergency segment deformation and prone to hole collapse, resulting in segment damage and economic losses; 3. On-site drilling is easily constrained by the environment. If the external water pressure and soil pressure are too large, it will cause engineering problems such as sudden surge and piping; 4. The crack grouting sealing technology cannot deal with all the segment leakage problems; 5. The effect of groundwater pressure on the segment cannot be reduced or eliminated by the crack grouting sealing method; 6. The grouting reinforcement cannot eradicate the settlement and segment deformation, the drilling holes in the prior art cannot be used multiple times, and the cost is relatively high

[0004] Therefore, in order to repair the problems of settlement deformation and segment leakage during the operation of the tunnel, and in view of the current engineering status of the urban underground environment that is increasingly complex and related grouting reinforcement technology is not perfect, there is an urgent need for a new type of construction that is fast, simple, safe and effective. Grouting reinforcement technology

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