Advance support fast construction method in shallow tunnelling loose pebble bed
It is a technology of shallow burial and underground excavation and advanced support, which is used in earth-moving drilling, mining equipment, installation of bolts, etc., to achieve the effect of controlling slurry diffusion, high rigidity and speeding up grouting speed.
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[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0023] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0024] A rapid construction method for advanced support in shallow buried excavation loose floating pebble layer, comprising the following steps:
[0025] A. Excavate the core soil in circular excavation on the upper steps of the tunnel, and erect steel frames;
[0026] B. Selection of drilling rig: Guide rail type independent rotary rock drill is adopted, and the main technical parameters should meet:
[0027] Dimensions (length × width × h...
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