Subway tunnel mouth rubber curtain fabric construction plan
Subway Tunnel Portal Engineering Geology
The subway tunnel entrance is based on geological survey report, supplementary geological survey report and excavation record of shield working well. From top to bottom, it is artificial filling layer, silt layer, silty clay layer, silt layer, fine sand layer, and medium Sand layer, coarse sand layer, pebble gravel layer, strong weathered argillaceous siltstone layer. When the shield machine exits the hole, a small part of the arch is located in and out of the silt layer, and most of the cave body is in the sand layer.
Metro tunnel port rubber curtain cloth overall plan
Before the excavation of the earth, the end earth reinforcement shall be carried out. After the earth excavation shaft main structure is completed, the gap between the solid and the outer wall of the continuous wall shall be reinforced by grouting; secondly, the first shield supporting trailer shall be assembled, and Drag it into the open-buried burial section structure; again, assemble the shield mainframe and connect the host with the rear supporting trailer to complete the debugging of the shield machine, and complete the surface mud treatment system, circulation system, vertical transportation system and horizontal transportation. System, pulping system installation and commissioning. During the above-mentioned work period, cross-operations may be completed to complete the sealing of the door and the hole door is broken. After the completion of the reaction support and the assembly of the negative ring segments, the initial state of the shield is formed and the start of tunneling of the shield begins. 13785855258 Pay
The design requires that the end wells be reinforced with a Ф850@250 rotary jet reinforcement. The design parameters of 28 days of soil strength reach 1.2mpa. See the drawings for specific dimensions. The tunnel door is closed with a continuous wall of underground walls, with a thickness of 800mm and two rows of Φ25~32 steel bars, all of which pass through the shield. The construction company plans to use 609mm thick steel pipe with 16mm wall thickness as the counterforce support.
Hole curtain plate installation
In order to prevent the loss of soil, groundwater, etc. from the clearance between the shield shell and the tunnel door during the initial tunneling of the shield, the temporary temporary sealing device for the portal shall be installed at the time of the shield's initial launch, sealed by the cord rubber, sector pressure plate, hinge plate, pad Tablets and bolts and other components. The construction is divided into two steps. The first step is to embed the pre-embedded steel ring in the process of starting the endwall construction. The second step is to install the hinged hinged pressure plate and the rubber cord plate before the shield starts.
Before the shield machine enters the reserved hole door, grease is applied to the outside of the cutter head and the outside of the cord rubber sheet to prevent the shield cutter from wearing the cord rubber sheet and affect the sealing effect.
According to the order of construction: how to deal with the door (outside, inside) before the construction of the shield—how to lay the track—how to install the reaction rack—how to install the door—how to close the door—how to push the shield—how to install the shield—how to install the tube—how to start the injection Slurry - how to deal with waterproofing to prepare special programs)
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