SU881331A1 - Method of constructing shallow-depth tunnel in unsolid rock - Google Patents

Description

(54) METHOD OF CONSTRUCTING A TUNNEL OF A FINE EMERGENCY IN WEAKLY RESISTANT BREEDS

I

The invention relates to the construction of underground structures and can be used when conducting shallow tunnels in weakly resistant rock and semi-rock formations.

There is a known method for constructing a tunnel; including placing along the project contour of the generation parallel to its longitudinal axis of the supporting rod elements, under the protection of which the soil is removed III.

The disadvantage of this method is the increased laboriousness of the work, due to the installation of bearing elements in underground conditions.

The closest to the invention to the technical essence and the achieved effect is the method of constructing a shallow tunnel laid in weakly resistant rocks, in which at first they install from the ground surface along the tunnel of bearing elements, and then remove the soil along the working contour between the bearing elements and into: “Water lining (2.

 This method is ineffective in the construction of excavation in rocky and semi-rocky rocks, since driving into the rocky soil of the piles is very laborious and impractical. In addition, a sufficiently high reinforcement of the host rocks is not provided, which reduces the safety of workers, increases the cost of erection building and, ultimately, also reduces the efficiency of work.

The purpose of the invention is to expand the field of use of the method and increase the efficiency of work.

The goal is achieved by those. what

to, the bearing elements are installed and released in vertical wells previously drilled from the surface of the earth, which are located across the entire width of the contour of the future development, while

The IS elements located directly above the excavation are buried only up to its design arch, and the supporting elements located along the contour of the side walls of the excavation are deepened below its design soil, then mono-milled

20, and the removal of the soil and the construction of the lining are carried out under the cover of a fixed roof.

In addition, reinforcing bars of a periodic profile are used as bearing elements.

FIG. Figure 1 shows the location of a well drilled from the surface of the earth at the site of a future tunnel location; in fig. 2 - wells in which the bearing elements are installed and the rock around them is monolithic; in fig. 3 - tunnel tunnel covered; in fig. 4 - tunnel with erected lining.

The method is carried out as follows.

Along the route, a tunnel is set along the width of the contour of the future production of the borehole 1. At the same time, if the rocks 2 enclosing the tunnel do not exert lateral pressure, the borehole only drills to the top 3 of the future production 4. Otherwise, along the walls 5 of the future 4 wells are being drilled and lateral wells are buried below the soil of 6 future wells.

The distances between the wells I in the transverse and extended directions are chosen by calculation, depending on the specific geological conditions and the physicochemical properties of the host rocks.

Then, in the wells 1, the supporting elements 7 are installed and released, for example reinforcing bars of a periodic profile, and a reinforcing composition (cement, polymer, etc.) is pumped through the same wells and the host rocks 8 are monolithed.

After hardening, the reinforcing composition under the cover of the fixed roof removes the soil along the contour of excavation 4 and erects the lining 9.

The use of this method allows to increase the safety of work by pre-consolidating the roof rocks, reduces the cost of erection of the lining.

due to the provision of the possibility of using supports of lightweight construction, it allows the construction of a tunnel with a profile opening to its full width.

Claims (2)

Invention Formula . A method for constructing a shallow tunnel in weakly resistant rocks, in which the first installation is made from the ground surface along the tunnel of the surrounding elements, and then the soil is removed along the outflow contour between the supporting elements and erected in order to expand the area using the method and increasing the efficiency of work, the load-bearing elements are installed and released in vertical wells previously drilled from the ground, which are located throughout the width of the contour — the future development, the supporting elements located directly above the excavation are deepened only up to its design arch, and the supporting elements located along the contour of the side walls of the excavation are deepened below its design soil, then homolithing the enclosing rocks is produced by injection into the wells of the reinforcing composition, and the removal of the soil and the construction of the lining is carried out under the cover of a fixed roof. 0 2. A method according to claim I, characterized in that reinforcing bars of a periodic profile are used as bearing elements. Sources of information taken into account in the examination  I. Accepted for Germany No. 22506535, cl. E 01 G 3/00, published. 1947. 2. Accepted for France № 2124483, cl. E 01 G 3/00, published. 1972 (prototype). SfV-jr X y / X x x % X X x X x x x x one eight I S-TTTf 7 /. 7, eight one I X Th I five one. Phie.2: