Rubber plywood@mall tunnel rubber slab

Construction scheme of rubber curtain panel for subway tunnel entrance

Engineering geology of subway tunnel entrance

According to the geological survey report, the supplementary geological survey report and the excavation record of the shield working well, the subway tunnel entrance is from the top to the bottom: artificial fill layer, silt layer, silty clay layer, silt layer, fine sand layer, middle Sand layer, coarse sand layer, pebble round gravel layer, strong weathered argillaceous siltstone layer. When the shield machine exits the hole, most of the hole is located in the sand layer except for a small part of the arch.

Overall plan of rubber plywood at subway tunnel entrance

First, before the earth excavation, the end soil reinforcement is carried out. When the main structure of the earth excavation shaft is completed, the gap between the solidification and the outer wall of the continuous wall is grouted and reinforced; secondly, the first shield is assembled and the trailer is assembled, and Drag it into the open-buried buried section structure; again, assemble the shield mainframe and connect the mainframe and the rear supporting trailer to complete the whole debugging of the shield machine, and complete the ground mud water treatment system, circulation system, vertical transportation system and horizontal transportation. Installation and commissioning of systems, pulping systems, etc. During the above work, the work can be crossed, the sealing of the hole door and the breaking of the hole door are completed. After the reaction force support is completed and the negative ring piece is assembled, the shield starting state is formed, and the shield is started to start. 13785855258 pay

The design requirements for the reinforcement of the end wells were reinforced with Ф850@250, and the soil strength of the design parameters for 28 days reached 1.2mpa. The specific dimensions are shown in the attached drawings. The entrance of the cave door is closed by a continuous wall with a thickness of 800mm and 2 rows of Φ25~32 steel bars. The construction unit plans to use a Ф609mm steel pipe with a wall thickness of 16mm as the reaction frame support.




Hole curtain panel installation

In order to prevent the soil, groundwater, etc. from being lost from the gap between the shield shell and the cave door when the shield is started, the temporary sealing device of the tunnel door is required to be installed at the beginning of the shield, and the seal is made of curtain rubber, fan-shaped pressure plate, folding leaf plate and pad. Pieces and bolts. The construction is carried out in two steps. The first step is to embed the pre-embedded steel ring in the initial wall construction process. The second step is to install the hole sealing joint pressure plate and rubber ply before the shield starts.

Before the shield machine enters the reserved hole door, the lubricating oil is applied on the outer periphery of the cutter head and the rubber sheet outside the curtain to prevent the shield cutter from wearing the rubber panel to affect the sealing effect.

According to the construction sequence: how to deal with the hole door (outside and inside) before the shield construction - how to lay the track - how to install the reaction frame - how to close the hole door - how to advance the shield - how to install the pipe piece - how to start the injection Pulp - how to prepare for waterproofing
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