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Tunnel dredging method suitable for railway large section IV, V class rock tunnel

The invention relates to the technical field of railway tunnel construction, specifically a digging method of IV and V-class surrounding rock railway tunnel with large cross section, aiming to solve the problems of the existing railway tunnel digging method including narrow operation space, low work efficiency, inflexible construction method, instable construction progress, high deformation potential of surrounding rock, and inconvenient operation. The method comprises performing leading support, digging arc-shaped pilot tunnel and preserving core soil; staggeredly digging left/right side walls of middle sidestep and preserving core soil; staggeredly digging left/right side walls of lower sidestep and preserving core soil; sequentially digging upper, middle and lower sidesteps and preserving core soil; and digging inverted arch and carrying out preliminary support. The invention has large construction space and high work efficiency, and can perform multi-job parallel operation. When the geologic conditions are changed, the invention can be flexibly and timely converted to other construction method. Preservation of core soil and left/right staggeredly digging are helpful to the stability of the digging working face. When the surrounding rock has large deformation, the invention can adjust closure time as soon as possible under the prerequisite of assuring safety and meeting requirements of clearance cross section.
Owner:CHINA RAILWAY 12TH BUREAU GRP +1

Novel multipurpose composite insulation board and construction method and processing device thereof

The invention relates to a novel multipurpose composite insulation board and a construction method and a processing device thereof. The novel multipurpose composite insulation board is manufactured by forming notches 7 with countersunk head openings 56 and through holes 9 with countersunk head openings 8 on the four sides and in the middle of an XPS insulation board and reserving connection intensifying anchoring supporting seats 2 in the through holes 9 or the notches of the board or reserving supporting seats 95 and 96 on the four sides of the board or sticking an aluminum foil reflecting layer 3 on the upper surface of the insulation board after forming a square or round-bottom groove on the insulation board. A conventional square supporting seat is improved into a supporting seat with a countersunk head of which the four sides are 5 to 50 millimeters wider than those of a supporting block and the upper part is embedded into the countersunk head opening, so support stressed area can be enlarged, and more importantly, a broken bridge insulating function is realized. The insulation board is easy to manufacture and simple and convenient to install and realizes production site assembly in a factory, so on-site wall plastering operation, facing tile wetting operation and paint spraying operation are eliminated; a nail framework does not needing paving; and the insulation board is widely applicable for insulation of warming ground surfaces, wall faces and roofs.
Owner:冯刚克
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