Construction method of crossing mining method tunnel by shield empty pushing

Abstract

The invention discloses a construction method of crossing a mining method tunnel by shield empty pushing. The construction method includes a mining method tunnel construction stage, a guide platform construction stage, a guide platform stepping-in construction stage, a shield empty pushing segment assembly stage and a shield traction mining method tunnel crossing construction stage. The mining method tunnel construction stage includes the step of installing brackets. The guide platform construction stage includes the steps of cleaning a base surface of the guide platform, measuring and settingout, concrete pouring and finishing and maintenance. The shield empty pushing segment assembly stage includes the steps of no-load propulsion of a shield machine, assembly of segments, segment backing backfilling, segment backfilling grouting and communication channel passing by the shield machine. The shield traction mining method tunnel crossing construction stage includes the steps of tractionequipment arrangement and traction. According to the construction method, the assembly quality of the segments can be ensured, so that the waterproof performance of the tunnel is ensured and the efficiency of shield empty pushing tunneling is improved, personnel investment is reduced, and the construction cost is reduced.

Description

technical field [0001] The invention relates to a construction method for shield tunneling through a mining method tunnel. Background technique [0002] With the improvement of the economic level and the acceleration of the urban construction process, the number of urban underground projects and underground rail projects is increasing. Shield tunneling is a very practical tunnel construction machine, which has the advantages of high efficiency, safety, and environmental protection. It is widely used in the current underground tunnel construction. When the tunnel adopts the construction method of "mining method for initial support + shield empty pushing and segmenting", there are still the following difficulties: [0003] 1. Before the shield machine is pushed in the mine tunnel, the guide platform of the shield machine must be completed in the mine tunnel. The construction quality of the guide platform will directly affect whether the shield machine can maintain a good prop...

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Problems solved by technology

[0004] 2. When the shield machine reaches the mining method tunnel 25m before the construction, as the rock and soil in front of the cutterhead gradually decreases, the disturbance of the shield machine to the front rock mass and the interface between the mining method tunnel section and the shield section also gradually increases. Therefore, if the shield tunneling parameters are not suitable, the shield tunnel cannot reach the mine tunnel section smoothly;

[0005] 3. When the shield machine slides on the guide platform, the resistance encountered is small, which may make the extrusion force between the segments fail to meet the design requirements, thereby reducing the waterproofness of the tunnel and making it easy to leak between the segment rings water;

[0006] 4. If the amount of grouting is too large, it will cause the cement mortar to flow back to the front of the cutter head, and the consolidated pebble stone accumulation will cause the shield machine to turn over when the cutter head rotates; if the amount of grouting is too small, it will start Without the effect of grouting on the back, the segment cannot be stabilized in time and the waterproof effect cannot be achieved

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