Construction method of shield close-range undercrossing underground excavated tunnel of composite stratum

Abstract

The invention relates to a construction method of a shield close-range undercrossing underground excavated tunnel of a composite stratum. The construction method comprises the steps of tunnel construction preparation; exit and entrance line underground excavated tunnel construction preparation; monitoring and measuring preparing work before crossing; control measures in the process of shield crossing; segment reinforcement in the shield tunnel; monitoring frequency control; and patrol control in a hole. The construction method has the beneficial effects that the method is simple in step, reasonable in design, easy and convenient to construct, low in input cost and high in implementation of actual engineering operation; through the construction method, the undercrossing tunneling efficiencycan be improved, and the posture of a shield tunneling machine is controlled, so that the possibility of tunnel accidents is reduced, and a favorable foundation for following successful crossing is laid; and the practical value is high, the using effect is good, compared with an existing construction method of undercrossing an underground excavated tunnel, the construction period is shortened, and the construction cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction and reinforcement protection, and in particular relates to a construction method for a complex ground shield tunnel to pass through a buried tunnel at a short distance. Background technique [0002] In recent years, with the large-scale construction of urban subways and related municipal projects, shield tunnels have been used more and more in China. Underpassing the tunnel under the shield machine is a construction stage with high technical difficulty and complicated procedures for shield construction. Once handled improperly, the soil between the structures is prone to collapse or loss, and even make the shield out of control. [0003] The shield machine has many difficulties in the construction process of the crossing section. For example, during the shield tunneling process, it is easy to cause over-excavation and deviation from the direction of the line, which will have a...

AI Technical Summary

Problems solved by technology

For example, during the shield tunneling process, it is easy to cause over-excavation and deviation from the direction of the line, which will have a great impact on the construction of the shield; another example is the serious water leakage of the shield forming segment, ensuring the quality of waterproof construction and avoiding the leakage of groundwater, which is very important for ensuring the operation of the subway Safety and protection of the surrounding environment are of paramount importance, if not handled properly it can further aggravate the damage and even cause the tunnel to collapse, jeopardizing the safety of life and property

[0004] When the shield machine excavates in the long-distance, top-soft bottom-hard composite stratum under the earth pressure balance mode, it is easy to cause mud cake on the cutterhead and soil bin, which will aggravate the wear of the cutter, and the impact on the peripheral hob at the junction of soft and hard The heavy load will easily cause the cutter ring of the hob to crack, the cutter will lose its working function, and opening the warehouse to clean up the mud cake will cause ground subsidence, affecting the safety of the ground and underground tunnels

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