Horizontal grouting construction method under closed environment

Abstract

The invention discloses a horizontal grouting construction method under a closed environment. The horizontal grouting construction method comprises the steps that grouting is conducted on the obverseside of a tunnel, and lap joint is conducted by 10 m in each cycle of 50 m; and as for first circulating, seventy-six grouting holes are formed, wherein the depths of the B1-B9 holes are 15 m, the depths of the A1-A67 holes are 50 m, the diffusion radius is 1.3 m, a drainage hole is 40 m in length and formed in the bottom, a flowmeter is mounted at a drainage opening and used for counting the drainage amount. The horizontal grouting construction method under the closed environment is simple, convenient and high in operability; double control over the grouting pressure and the grouting amount is put forward, a 'double-control and speed decreasing' principle is adopted in the construction process, and a closed body and stratum deformation can be effectively controlled; the grouting order isthat grouting is conducted on the outer side firstly and then grouting is conducted in the center, and the influence of grouting on the closed body is reduced advantageously due to the fact that the grouting is conducted on the outer side firstly; the emphasis is laid on informatization construction, and adjusting of parameters of the grouting pressure, grouting speed, grouting amount and the likeis guided through the monitoring situation; a 50 m of soil body can be horizontally reinforced at a time, and quick centralized construction is facilitated; and the horizontal grouting construction method under the closed environment is safe, reliable, efficient, economic and practical.

Description

technical field [0001] The invention relates to a horizontal grouting construction method in a closed environment, which is particularly suitable for the horizontal grouting construction method in the surrounding wall environment formed by frozen soil. Background technique [0002] Tunnels or sections whose upper covering layer is less than twice the span of the tunnel are shallow-buried tunnels. With the development of society and economy, there are more and more shallow-buried tunnels. Shallow-buried underground excavation tunnels are mostly pre-supported in advance, and the advanced pre-support includes advanced anchor rods, advanced pipe sheds, and advanced frozen supports. The cross-section of the underground excavation section at the port of Gongbei Tunnel is 21m high, 18.8m wide, 255m long, and buried 4 to 5 meters deep. The tunnel is located in a saturated soft soil environment near the sea, and the geological conditions are complex. The strata from top to bottom ar...

AI Technical Summary

Problems solved by technology

There are many problems with grouting in a closed environment. High grouting pressure can easily cause cracking of the frozen wall and overall uplift of the frozen wall, resulting in uplift and cracking of the ground surface, which brings safety hazards to surface buildings; low grouting pressure cannot reach the level of grouting reinforcement soil The purpose of the tunnel face is poor stability, which brings great risks to the excavation of construction projects

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