Q:Loess tunnel construction quality control points

2) the invert, invert the filling layer and dry concrete construction should be concrete accurately, use the template, mechanical tamping compaction. The inverted arch concrete by pumping casting, should use the arch template ensure molding size meets design requirements. The construction of invert arch and filling layer should be completed according to the design of inverted arch concrete construction, the appropriate interval, and then change the proportion of concrete, filling layer of concrete construction;The construction of inverted arch and the cracks and deformation joints should be waterproof treatment according to design requirements, should be in accordance with the relevant provisions of this guide.Invert the overbreak in the allowable range, should be used with the same strength grade of concrete lining casting; overbreak exceeds, should according to the requirements of design and specification of the backfill, shall not use the random hole slag backfill, non intrusive rubble arch section.

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:What is the role of the tunnel formwork trolley? What is the use of template trolley?

The car is often used in the construction of hydraulic tunnel, the tunnel is not allowed to have concrete construction longitudinal joints, in the hydraulic tunnel span is large

Q:What are the steps? If you build a template, how to fill in the concrete. The tunnel is to dig all the generalist pouring, or digging into the side. Simply say. Better picture. In addition, we have seen a video, the shield machine to dig up the tunnel after the installation of a number of prefabricated panels, but these prefabricated plate is curved. Do not have to fill in a semicircle tunnel?

Two lining trolley consists of two parts, one is the erection and welding of steel trolley, and the other is pouring trolley.

Q:The tunnel structure of plastic mould

The tunnel model is a kind of tool form template which is used for pouring concrete wall and floor at the same time.Total tunnel mode tunnel mode and half tunnel mode two, the basic unit of the tunnel mode is a complete tunnel template, half tunnel is composed of a plurality of unit angle die, and then use the 2.5 tunnel mode to fight and become a complete tunnel mode.

Q:The arch and the arch of the tunnel

Tunnel arch wall refers to both sides of the tunnel wall and the top of the arch, the tunnel arch wall is generally the use of a template trolley.

Q:What are the reasons for the two lining concrete lining of the tunnel?

(4) improper concrete mix, segregation, depending on the template part of the lack of slurry or template serious leakage;(5) no watering wood template wet, water bonding or early form removal, Chaimo missing edge off angle, resulting in reinforcement.

Q:Tunnel steel arch behind the steel mesh after a layer of fine iron wire mesh what effect is there?

3, advance small catheter grouting small catheter with diameter of phi 32-50mm steel pipe, the tip of the tube 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: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

Q:What is the concrete construction of the tunnel invert

It is not required to ensure the appearance of the concrete, is the high pressure jet, the rapid solidification type.