SU1393873A1 - Method of eliminating voids beyond the steel lining of pressure-head underground water conduit - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. tunnels with steel lining and can be used in the construction of underground hydroelectric power plants and PSPs. The purpose of the invention is to improve the quality and reduce the cost of filling the gap. In the manufacture of assembly parts of the steel cladding 1, rubber cords 2 are attached along its lowest line. After the cladding is installed, the lining 5 is concreted in the excavation 3 of the conduit 4, and gaps 6 are formed between the cladding and concrete. Holes located in the channel and the end of the trimmed area to be installed, will pressurize the cement solution. After hardening of the cement slurry, temporary plugs are removed from the holes, and the holes are sealed with permanent plugs. 4 il. and S (L S

Description

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The invention relates to the construction of hydraulic tunnels with steel cladding and can be used in the construction of hydroelectric power stations and GAESo

The purpose of the invention is to reduce costs and improve the quality of cementing behind the steel lining of a pressure underground water conduit.

FIG. Figure 1 shows the cladding with a rubber cord} in FIG. 2, which is then burned, is made of concrete (a gap is formed under the cladding); in fig. 3 - facing with a gap in the lower part of the lining and a hollow triangular channel; Fig, 4 - facing with a filled gap.

The method for eliminating gaps is as follows.

In the manufacture of assembly units eB steel cladding 1 (Fig. 1) along the lowest line along the axis, fasten 3 "new cords 2 triangular cross-section. neither Mounted facing in the underground in |) 1working 3 conduit 4.

I Then, install the face formwork and concrete the lining 5 (FIG. 2), feeding the concrete from the end face of the formwork.

I During the hardening and subsequent cooling of the concrete mixture under the action of a solid and a concrete shrinkage in the bottom

 cladding 1 gaps 6 are formed. Subsequently, after the concrete has hardened, rubber cord 2 is removed from the lining 5 from the end, and a longitudinal channel 7 of triangular shape (4) Ig. H is formed in lining 5. Then it is drilled in steel cladding 1 opposite to channel 7 about the hole 8, Beta13938732 on each section

Lining 5 drills at least 2 holes.

The cement slurry 9 is injected through one of the holes 8, and the air in the gaps 6 and channel 7 is squeezed out through the other hole. When a solution appears from the air outlet, the latter is blocked with a temporary plug (not shown) and the solution is pressed. given pressure. When this solution through the channel 7 penetrates into all gaps as along the perimeter, so

15 and along the length of the concreted section of the lining 5, creating an external continuous contact between the metal sheath 1 and the overcast concrete 5 (FIG. 4) „

Claims (1)

20 After the cement slurry has hardened, temporary plugs are removed from the openings 8 and the holes are sealed with permanent plugs 10, Invention Formula 25 Method of eliminating gaps for steel cladding of a pressured underground water conduit, which includes making holes in steel cladding and tamping through them, that is, so that, in order to improve quality and reduce the cost of filling the gap, before installing the steel cladding on its outer surface along the lowest line along the axis fix the triangular elastic cord, and after concreting the lining and forming a gap, pull the cord and form a longitudinal channel in the lining, then make 4Q a hole through two holes, located at the beginning and at the end of the mount. my site lining. at the beginning and at the end of the mount. my site lining. ////// / ///// FIG. one Have /// I // L / // 7 X about fig.Z In ///// //// // Fi. V