Construction method of large-diameter slurry shield zero-settlement traversing ballastless track subgrade

A mud-water shield and ballastless track technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc.

A mud-water shield and ballastless track technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc.

CN109653755AActive Publication Date: 2019-04-19ERCHU CO LTD OF CHINA RAILWAY TUNNEL GRP
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  • Construction method of large-diameter slurry shield zero-settlement traversing ballastless track subgrade

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Embodiment Construction

[0093] The construction method of the present invention will be further described in detail below in conjunction with the drawings and specific implementations of the specification.

[0094] Such as figure 1 As shown, the construction method of the present invention specifically includes the following steps:

[0095] Step 1. Ground grouting reinforcement construction:

[0096] Step 1.1. Construction laying out and trench excavation:

[0097] Step 1.1.1, dig trenches before drilling, use geological radar equipment in the trenches to detect water sacs and cavities below the foundation of the building to be protected, and perform targeted drilling for existing water sacs and cavities. And filled with 1:2.5 cement mortar;

[0098] Step 1.1.2, excavate the trench with a width of 2.0m and a depth of 2.5m;

[0099] Step 1.2. Drill holes on the ground and bury the grouting pipe:

[0100] Step 1.2.1. Place the rig on a steel console with a 360° angle that can be fine-tuned, use a geological comp...

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Abstract

The invention relates to a construction method of a large-diameter slurry shield zero-settlement down-traversing ground fast-track subgrade. The construction method includes the steps: 1 ground grouting reinforcement construction; 2 construction monitoring; 3 shield down-traversing fast-track line construction; 4 deviation correction and tunneling direction control; 5 construction measures in a shield down-traversing process hole; 6 on-site walk-around operation. The construction method has the advantages that the advantages of slurry shield are sufficiently taken, the slurry pressure of a front tunnel face is controlled by adjusting the pressure of an air cushion bin in slurry balance shield, so that the water and soil pressure of a shield front excavation face is balanced by the aid of the slurry pressure, stability of the front excavation face is ensured, ground subsidence is decreased, and existing tunnels and underground pipelines near a construction tunnel cannot be damaged.

Description

Technical field [0001] The invention relates to the technical field of shield construction, in particular to a construction method for a large-diameter slurry shield to pass through a ballastless track subgrade with zero settlement. Background technique [0002] In recent years, with the development of infrastructure constructions such as railways, highways, urban rail transit, and water conservancy, large-diameter shields have been increasingly used in urban rail transit. Therefore, shield tunneling has an impact on existing structures on the ground. The influence of structures is also increasingly prominent in various projects. How to effectively control ground settlement during shield construction to protect the safety of existing structures and underground pipelines near the tunnel has become an important issue that must be resolved in urban underground engineering. In particular, the problem of shield tunnels traversing existing lines, involving structural stability and norm...

Claims

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Application Information

Patent Timeline
19 Apr 2019
Publication
CN109653755A
IPC
E21D9/08; E21D9/00; E21D11/10
CPC
E21D9/001; E21D9/08; E21D11/10
Inventors
许维青; 翟志国