Q:What are the driving jobs in the tunnel

Outside control traverse 2) elevation control survey 3) in construction traverse

Q:What is the concrete construction of the tunnel invert

As the name implies, concrete is the concrete that needs to be supportedv

Q:Where is the B-B section of the tunnel invert reinforcement

This part of the tunnel lining is generally the first pouring, pouring formwork trolley can be placed on the inverted arch concrete and support, to the construction of the tunnel arch wall concrete.

Q:In the tunnel construction, the water stop belt and the water stop strip are respectively used in what place, the construction joint and the subsidence seam many meters set a, above all has any function

Fixed strip: the use of additional reinforcement fixation; special fixture fixed; the wire and fixed template (Figure 2), such as perforation, can only choose the installation area on the strip edge, not to damage other parts

Q:12 meters of the tunnel car, under normal circumstances, one of the two months to be able to cast a few models?

According to the normal situation, three days a lining cycle, a month to play at least 9 plates!

Q:How the arch of the tunnel concrete pouring up, how to support before pouring, using I-beam is directly support the earth?

Two concrete tunnel lining, template is used according to the size and shape of the tunnel design custom-made, I-beam welded frame, welded steel plate, known as the "two trolley liner" (hydraulic jack lifting and installation of steel wheel moving on the rail), is generally the length of 9~12m, concrete pouring pump concrete.

Q:Demolition of tunnel bearing formwork for several days

With the temperature, the need for concrete strength of 100% to remove the template

Q:How the tunnel template is calculated

According to the experience and the reuse rate of the template, the thickness of the single lane tunnel template is 10mm, the thickness of the single three lane template is 12mm, and the thickness of the one-way tunnel is 15mm. Consider the length of the template and the construction of the impact of general 10m, not more than 12 meters.

Q:How many meters can be poured in the first floor of the 2 level of the surrounding rock of the railway tunnel?

And these kinds of excavation methods need to determine the number of excavated meters according to the grade of surrounding rock. Tunnel invert and floor is completed after the initial support (that is, shotcrete, a layer of concrete, in the excavation of rock on some hard rock without vertical spray arch thin, weak surrounding rock shall be sprayed on the vertical arch thickness in this special project map will show) for pouring 2 reinforced concrete lining when left in general is 6~12 meters

Q:Tunnel construction procedure A cycle of steps

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;