Hydraulic and Hydroelectric Tunnel

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Hydraulic and Hydroelectric Tunnel

Q: Where is the B-B section of the tunnel invert reinforcement: Tunnel invert refers to the bottom of the tunnel (anti arch, so called inverted arch)

Q: How to put the positioning point is based on what is mainly based on my novice, do not: The first measurement group with total station will be five points (template center, 2 large side mode along the point, 2 small side mode along the projection point) in lofting invert, with nails into the inverted arch concrete as a symbol, and note the nail surface elevation

Q: Would you please tell me the difference between the concrete and shotcrete in the tunnel?: Characteristics of shotcrete:(1) the sprayed concrete has the characteristics of rapid growth, strong bonding force, high density and good impermeability. It can better fill the gap between the rock blocks, increase the integrity of the surrounding rock, prevent the free surface weathering and loosening, and work together with the surrounding rock.(2) the construction of shotcrete will transfer, pouring and tamping a few processes into one, and do not need a template, so the construction of fast, simple.(3) sprayed concrete can play an important role as early as possible.(4) compared with the concrete, the physical and mechanical properties of sprayed concrete are improved.

Q: How the arch of the tunnel concrete pouring up, how to support before pouring, using I-beam is directly support the earth?: The excavation of the tunnel face, slag, to the primary support system, first hit the bolt, then use steel or steel made of steel, installation support in tunnel contour, and then sprayed concrete (poor surrounding rock hanging steel mesh, then sprayed fiber concrete).

Q: How to design the general layout of the tunnel construction organization design: I need to contact you to provide a template..

Q: What is the role of the grid steel frame and steel mesh in the power tunnel: Advanced small pipe grouting small catheter with a diameter of 32-50mm steel pipe, the pipe tip and tube holes for special processing. The first row with drill drilling pipe. Row spacing is 30cm, fan shape, elevation of 5 degrees to about 8 degrees. The length is 2.25m, a single fluid grouting (cement) or double grout (cement water glass slurry). Adjust the grouting pressure according to the soil.

Q: What are the driving jobs in the tunnel: Outside control traverse 2) elevation control survey 3) in construction traverse

Q: Who can give me detailed tunnel construction process: Tunnel construction process, the first branch is a temporary payment, two lining is a permanent support.1, the hole before the edge, the construction of the slope (including drainage, electricity, etc.);2, the construction of large pipe shed3, measurement positioning line;4, drilling, blasting;5, slag, playing anchor, steel, injection (including the initial spray and spray)6, ahead of the anchor (after the pipe section)7, measuring the line;

Q: What is the width of a ring in a tunnel: The car is generally long 9m can be a one-time pouring, a ring is a pouring two lining length

Q: I would like to ask the high-speed rail tunnel invert small side wall and arch with the small side of the wall of the hanging formwork of what a good method?: The pouring of inverted arch and the pouring of the short side wall, do not step in place, install the side die on the invert

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