Sealing device for slurry shield starting of water-rich sand layer and sealing control method for starting

Abstract

The invention relates to the field of tunnel shield construction, in particular to a sealing device for slurry shield starting of a water-rich sand layer and a sealing control method for the starting, and solves the problem that the conventional sealing devices are poor in effect, and high in risk, and water leakage and grout leakage are easy to occur during a shield starting process. Grease distributing valves are additionally arranged on shield tail grease filling pipes; an external steel loop is connected with a tunnel portal steel loop; two wire brushes are arranged in the external steel loop; grease injection holes with gate valves are reserved between the wire brushes; after the shield is assembled on a starting base, grease is smeared on the wire brushes of the external steel loop; a cutter head is pushed to a station space enclosing structure; the grease injection pipes are connected with the grease injection holes reserved in the external steel loop and the grease distributing valves; the grease injection gate valves are opened to enable the grease to be injected between the two wire brushes from the grease injection holes reserved in the external steel loop to fill the interspace; slurry balance is built to conduct shield starting. According to the invention, slurry shield safe starting is realized; slurry shield starting technology is simplified greatly; the technology is simple; the technique is advanced; the practicability is high.

Description

Technical field [0001] The invention relates to the field of tunnel shield construction, in particular to an initial sealing device and an initial sealing control method of a muddy shield in a water-rich sand layer. Background technique [0002] The construction of shield tunnels in my country has developed rapidly, especially the construction of mud-water shields used for crossing rivers and rivers has been successfully used. However, the continuous adjustment of the posture during the start of the shield often leads to the failure of the water-stop curtain to adhere to the shield as a whole. In the event of water jetting and sand inrush, especially the moment the shield tail enters the door ring of the tunnel, there is always a passage between the water stop curtain and the shield body, which leads to the loss of the originating end formation. All mud water shields have experienced jetting accidents. The launching safety accident of the mud water shield has become the first ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the existing muddy water shield starting sealing device has poor effect, high risk, and the phenomenon of water leakage and slurry leakage is very easy to occur during the shield starting process, the invention provides a water-rich sand layer muddy water shield starting Sealing device and initial sealing control method

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