Spiral type fabricated tunnel structure and construction method thereof

Abstract

The invention discloses a spiral type fabricated tunnel structure and a construction method thereof. The spiral type fabricated tunnel structure is formed by assembling pipe pieces through connecting bolts, and the longitudinal length and the circular width of the pipe pieces can be determined according to the stability of a rock and earth mass. The construction method of the spiral type fabricated tunnel structure comprises the steps as follows: firstly, a pipe piece space is spirally excavated in the tunnel circumferential direction with a method for rock breakage through tools or a manual excavation method, then one pipe piece is assembled and is filled through grouting, the steps are repeated, and thus the tunnel structure extends forwards along the spiral line. The rock and earth mass in a tunnel is excavated with a borehole-blasting method, with a static blasting method or with general machinery such as an excavator and a milling excavator after the tunnel structure is advanced by a certain distance. With the structure and the method, the single-time excavated section is reduced, the time that the face is exposed to the air is shortened, and the mass of construction mechanical equipment is reduced.

Description

Technical field [0001] The invention relates to the field of tunnels and underground engineering, in particular to a spiral assembled tunnel structure and a construction method thereof. Background technique [0002] In tunnels and underground engineering, prefabricated tunnel structure is a commonly used structure type, which is generally matched with mechanical construction. These machines mainly include tunneling machines, shield machines and pipe jacking machines. The common feature of these methods is that the tunnel structure must be assembled after full-section excavation on the tunnel face perpendicular to the tunnel axis. The disadvantages of these methods are as follows: First, because the full-section excavation area is large, the tunnel face The rock face is large and lasts for a long time. When the stability of the rock and soil is very poor, in order to maintain the stability of the tunnel face, it is often necessary to adopt measures such as pre-support, soil pressu...

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Problems solved by technology

The common feature of these methods is that the tunnel structure must be assembled after full-section excavation on the tunnel face perpendicular to the axis of the tunnel. Their shortcomings include the following aspects: First, due to the large area of ​​full-section excavation, the circumference of the tunnel face The rock surface is large and lasts for a long time. When the stability of the rock and soil mass is poor, measures such as pre-support, earth pressure or mud-water balance are often required to maintain the stability of the face, which increases the project cost and reduces the work efficiency; The second is that the rock and soil within the entire tunnel outline are all broken by knives. The problem of tool wear is prominent, and frequent shutdowns are required to replace the knives, which is economical. Large volume and high cost, it is difficult to apply in medium and short tunnels

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