Small-diameter shield tunnel F-block limiter

Abstract

The invention relates to a small-diameter shield tunnel F-block limiter. The small-diameter shield tunnel F-block limiter comprises a bolt, an L-shaped buckle and a U-shaped buckle, a screw hole is formed in the upper side face of the L-shaped buckle, and a connecting through hole is formed in the lower side of the L-shaped buckle; the lower side of the L-shaped buckle is connected with a duct piece longitudinal bolt through the connecting through hole, and the upper side of the L-shaped buckle is tightened and fixed through the bolt to form jacking force towards the outer sides of duct pieces. The L-shaped buckle and a duct piece embedded iron casting are fixed through the U-shaped buckle, and the situation that the inner arc faces of the duct pieces are opened due to the fact that the duct pieces are subjected to external soil pressure, and friction resistance between the duct pieces is increased is avoided. The small-diameter shield tunnel F-block limiter is characterized in that the bolt is connected with the L-shaped buckle to form jacking force towards the outer side of a tunnel so as to balance the acting force of peripheral soil bodies on an F block during shield tunneling, the U-shaped buckle is connected with the L-shaped buckles and the duct piece embedded iron castings, and the situation that the inner arc faces of the duct pieces are opened due to the fact that the duct pieces are subjected to peripheral soil pressure, and consequently the friction resistance between the duct pieces is increased is avoided; and the problem that slab staggering on the two sides of the formed tunnel top sealing block is too large is effectively solved, and it is ensured that the shield tunnel forming quality meets the standard requirement.

Description

technical field [0001] The invention relates to a stopper used in shield tunneling construction, in particular to a stopper for a small-diameter shield tunnel. Background technique [0002] With the continuous development of the city and the rapid increase of the population, the construction method of water supply, drainage, gas and other pipelines used in the past can no longer meet the demand, and people gradually turn their attention to the construction technology of underground excavation. The shield method construction technology has entered people's field of vision due to its high degree of mechanization, low impact on the ground, and high quality. Shield tunnels often use prefabricated block segments, which are assembled into a ring in the shield assembly area to form a tunnel. During the construction period, segment misalignment often troubles the construction technicians. It not only affects the appearance quality of the tunnel, but also causes problems such as tun...

AI Technical Summary

Problems solved by technology

During the construction period, the segment misalignment often troubles the construction technicians. It not only affects the appearance quality of the tunnel, but also causes problems such as tunnel water leakage, segment rupture and shield tail brush damage, and even has a serious impact on the formed tunnel.

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