Construction method of small clear distance laminated tunnel

Abstract

The invention relates to a construction method of a small-clear-distance laminated tunnel. The construction method comprises the following steps that a to-be-constructed lower layer tunnel and a to-be-constructed upper layer tunnel are subjected to in-advance support; the area, close to the upper layer tunnel, in the lower layer tunnel is excavated to form a first area, and corresponding construction of primary lining is conducted; a pilot tunnel is excavated at the position, opposite to the first area, inside the upper layer tunnel, and subjected to primary lining; a reinforcing device for sandwiched rock between the upper layer tunnel and the lower layer tunnel is constructed in the pilot tunnel; the rest part of the lower layer tunnel is excavated to subjected to corresponding construction of primary lining, and the lower layer tunnel is subjected to secondary lining construction; and the rest part of the upper layer tunnel is excavated and subjected to subsequent construction. According to the construction method, the pilot tunnel is arranged on the upper layer tunnel to enable a vibration wave to be propagated in air so as to reduce the influence of blasting of the upper layertunnel on a lower layer tunnel support structure and the sandwiched rock, mechanical equipment can be directly arranged in the pilot tunnel for operation, work such as sandwiched rock drilling is conducted from top to bottom, the problem that the small-clear-distance laminated tunnel is difficult to construct is solved, and thus the construction process is safer.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for a small clear distance laminated tunnel. Background technique [0002] With the continuous increase of investment in my country's infrastructure industry, tunnel engineering construction has ushered in rapid development in recent years, and a number of laminated tunnel projects have emerged, and are developing in the direction of small clearance, multi-cavity, and large cross-section, providing tunnel design and construction brought new challenges. [0003] In the construction of laminated tunnels, due to repeated disturbances in the construction of multiple tunnels, the interlayer rocks between the upper and lower tunnels are often subject to the most complex forces, which is the key link affecting the overall construction safety of laminated tunnels. Therefore, it is often necessary to take measures such as pre-grouting or In order to reduce the cons...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, provide a construction method of a small clear distance laminated tunnel, solve the problem that the small clear distance laminated tunnel is complicated to construct and the engineering quality is difficult to guarantee, and at the same time make the construction process safer

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