Construction method for preventing roof caving of shield in construction

Abstract

The invention provides a construction method for preventing roof caving of a shield in construction. The construction method comprises the steps that 1, stratum investigation is performed along a shield path; 2, a cap peak device is installed on a shield tunneling machine; 4, the cap peak device is applied to shield construction. When the cap peak device is not adopted, the cap peak device is retracted into a cutterhead face through a hydraulic oil cylinder; when the shield enters the roof caving stratum, the cap peak device can stretch out by means of the hydraulic oil cylinder, the stretching-out length can be determined according to the condition of the stratum, and roof caving is prevented according to the stretching-out length of the cap peak. By adopting the construction method, roof caving of the shield on various geological conditions is prevented more easily and conveniently, the axis control quality is improved, and soil body disturbance and ground deformation are reduced.

Description

technical field [0001] The invention relates to a construction method in the technical field of shield tunneling engineering construction, in particular to a construction method for preventing a shield from roof collapse during construction. Background technique [0002] The shield tunneling method has the characteristics of fast excavation speed, small construction impact, and low labor intensity, and is the main construction method for large and medium-sized tunnels. However, due to the complex underground geological conditions, when the forward thrust of the shield machine is greater than the resistance of the soil in front of the shield machine, the roof of the shield machine will fall, which will affect the tunneling direction of the shield machine and increase the disturbance range of the soil. Especially for complex stratum conditions, different soil layers have different cutting difficulties, and it is more difficult to control ground subsidence and deformation. Ther...

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Problems solved by technology

However, the protruding positioning pile will inevitably increase the disturbance to the soil, thereby increasing the ground deformation

Moreover, this invention is only applicable to simple formation conditions, and does not consider complex geological conditions, especially the situation that there are many obstacles in the adjacent formations.

Using the method of this invention patent can not solve the problem of shield roof collapse under complex geological conditions and it is difficult to guarantee the construction quality and environmental protection

Therefore, the existing technology has the disadvantages of large soil disturbance, large ground deformation and poor actual effect when preventing the shield machine from falling during the construction process.

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