Anti-floating bag type positioning grouting anchor rod for underwater tunnel and construction method of anti-floating bag type positioning grouting anchor rod

Abstract

The invention discloses an anti-floating bag type positioning grouting anchor rod for an underwater tunnel and a construction method of the anti-floating bag type positioning grouting anchor rod. The anti-floating bag type positioning grouting anchor rod comprises a bag type positioning grouting anchor rod foundation main body and a positioning grouting device; the bag type positioning grouting anchor rod foundation main body comprises a bag, a perforated pipe and a pressure sensor; the positioning grouting device comprises an electromagnet limiting stopper, a grouting guide pipe and a displacement sensor; the bag serves as a container for containing later grouting liquid, and grouting space is large; the bag is large in telescopic range, small in size without grouting, and rapid and convenient to construct; steel bars are bundled and connected with external flexible pipes, manufacturing is easy, and construction cost and construction period are saved; rapid positioning grouting is achieved through the electromagnet limiting stopper, and grouting amount and the electromagnet limiting stopper are more accurately controlled through the displacement sensor and the pressure sensor. According to the anti-floating bag type positioning grouting anchor rod for the underwater tunnel and the construction method of the anti-floating bag type positioning grouting anchor rod, the anti-floating bag type positioning grouting anchor rod is convenient to install and construct, the effect of preventing and treating a floating problem of the underwater tunnel is remarkable, and the anti-floating bag type positioning grouting anchor rod has wide engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of anti-floating of underwater tunnels, in particular to a capsule-type positioning grouting anchor for anti-floating of underwater tunnels and a construction method thereof. Background technique [0002] With the rapid development of my country's land transportation, underground tunnels began to extend to rivers, rivers, lakes, seas and other underwater. Sea reclamation, offshore dam projects, artificial islands, cross-sea bridges, submarine tunnel projects, submarine pipelines and other marine projects emerged as the times require. Great prospects for development. [0003] In the long-term operation process, due to unloading above the tunnel, vibration and wear during tunnel operation, and erosion of chloride ions in the ocean, etc., when the self-weight stress of the overlying soil and the tunnel itself is smaller than the upward buoyancy force, the underwater tunnel will inevitably collapse. There is a...

AI Technical Summary

Problems solved by technology

But this method has following deficiencies: 1, this method is applicable to the engineering condition that groundwater table is lower on the ground, for the anti-floating of underwater tunnel, it is not enough to rely on its own weight and the weight of overlying soil alone; 2, cannot be accurate and timely 3. Improper control of surcharge pressure will lead to tunnel convergence and damage, resulting in greater losses

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