Floating Control Device Applicable to Quasi-Rectangular Shield Tunnel

Abstract

The invention discloses a floating-up control device suitable for a quasi-rectangular shield tunnel. The device comprises a construction frame set and a counterweight frame, wherein the construction frame set is arranged at a shield tail of a quasi-rectangular shield machine in a dragging manner along a construction track in an excavated tunnel; the construction frame set comprises a plurality of construction frames connected in sequence through first connecting beams; the counterweight frame is connected to the first construction frame, closest to the shield tail of the quasi-rectangular shield machine, in the construction frames through a second connecting beam along the construction track in the excavated tunnel; and counterweight blocks are loaded on the counterweight frame by piling to ensure that anti-buoyancy force of the current excavated tunnel is not smaller than floating-up force on the tunnel. According to the device, the counterweight frame is arranged at the shield tail of the quasi-rectangular shield machine in the dragging manner and the counterweight blocks are loaded on the counterweight frame by piling, so that the weight of the current excavated tunnel is increased, the anti-buoyancy force of the tunnel is directly increased, and the anti-buoyancy force of the current excavated tunnel is not smaller than the floating-up force on the tunnel; and moreover, the quasi-rectangular shield machine and the counterweight frame can be synchronously propelled without the need for carrying the counterweight blocks for multiple times.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a floating control device suitable for rectangular shield tunnels. Background technique [0002] In recent years, with the increasing use of urban underground space, shield construction technology has been widely used in various underground projects due to its advantages of low impact on the surrounding environment, high safety, high molding quality and fast construction progress. Among them, it has become the main construction method for underground large-scale projects such as subway tunnel projects and municipal pipeline projects. During the construction of shield tunnels, for segments that have just left the tail of the shield, partial or overall floating often occurs, which has been confirmed by many engineering practices, manifested as segment misalignment, cracks, damage, and even axis deviation. Especially when crossing the shallow overlying soil at the bottom o...

AI Technical Summary

Problems solved by technology

However, during the construction period, the buoyancy of the tunnel mostly occurs after the segments come out of the tail of the shield. At this time, the floating section of the tunnel is located in the frame section, and the space in the tunnel is small, which does not meet the conditions for a large number of stacked lead blocks. Many times of movement, the actual operation is very difficult

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