Small-pilot-tunnel advance support equipment and construction method

Abstract

The invention provides small-pilot-tunnel advance support equipment and a construction method and belongs to the technical field of subway station pilot tunnel construction. The equipment comprises anarched cutting form board, a lateral wall cutting form board, a rear support device and two pushing devices and is characterized in that the arched cutting form board is located on an upper step at the front end of a small pilot tunnel and connected with the lateral wall cutting form board of a lower step through the pushing device A, the lateral wall cutting form board is connected with the same-level rear support device at the rear of the lateral wall cutting form board through the pushing device B. The small-pilot-tunnel advance support equipment has the advantages that conical drill bitsand soil cutting hobs are used to cut the soil of an arch and a lateral wall, spiral hobs are used to discharge soil, arched shovel blades and lateral wall shovel blades are used to remove residual soil under the jacking effect of the pushing devices, the lateral wall cutting form board and a lining structure at the rear of the lateral cutting form board form a sealed molding space, the molding space is grouted through grouting holes to form a lining structure, excavation is performed after the lining structure reaches 75% of design strength, and a bottom plate is constructed finally. By the construction method, advance support before excavation is achieved, and ground surface settlement is reduced.

Description

technical field [0001] The invention relates to the technical field of construction of pilot tunnels in subway stations, in particular to advance support equipment and construction methods for small pilot tunnels. Background technique [0002] With the rapid increase of urban population, the subway has become an important means to solve the traffic congestion problem. During the construction of the subway station, the hole pile method does not affect the ground traffic, and compared with other underground excavation construction methods, it is more important to control the ground surface. The settlement is relatively good, and it is favored by the majority of engineering and technical personnel, but when passing through important building groups and areas with complex engineering geology, the requirements for settlement control still need to be further improved. Analyzing the settlement factors in the tunnel pile method construction, it can be seen that the main settlement c...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of large surface settlement in the existing pilot tunnel construction process, the present invention provides a small pilot tunnel advance support equipment and construction method, which can effectively control the surface settlement caused by pilot tunnel construction, and at the same time Improve construction speed to a certain extent and save construction cost

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