SU1020506A1 - Steel-concrete shaft lining - Google Patents

Description

The invention relates to the underground construction of vertical turbine pipelines of hydroelectric power stations and PSPs.

Steel-concrete lining is known; shafts, including steel piping * concreted in a vertical working out, equipped with ring stiffeners located on the outer surface of the L1J pipeline.

In this lining, the steel pipeline has sufficient load-bearing ability to influence groundwater and the pressure of the concrete mixture during the construction of the lining.

However, when the annular space is filled with concrete mixture under stiffening ribs, under the ceiling surfaces, empty cavities are formed. When these cavities stop, underground water collects in them, which has both force and aggressive effect on the pipeline. In addition, the presence of cavities weakens the sealing of stiffeners in concrete, which reduces the operational reliability of the lining. In order to prevent the formation of cavities in the stiffeners, openings are arranged, however, the latter do not ensure reliable contact of the lower surfaces of the ribs with concrete filling. voids are monolithic, such as cement mortar. After injection ^5, the holes are hermetically sealed and ground. Thus, the modern design of reinforced concrete lining requires for its fulfillment additional neproizvoditel- _h '40 nye costs and lining has insufficient operational reliability.

A steel-concrete lining of the shaft is also known, including a steel pipe concrete-cased in the vertical plane with external spiral stiffening ribs £ 2].

However, the known lining does not exclude the indicated drawbacks of existing structures, although it increases the non-50 existing ability of the structure.

The purpose of the invention is to simplify the design, structure, improve the quality of concrete breaking and reduce labor costs n <* lining.

This goal is achieved by the fact that the external spiral stiffening ribs are made in the form of a duct placed with the base down and attached to one of the side walls to the pipeline.

In FIG. 1 shows a shaft fixed by the proposed lining, a vertical section; in FIG. 2 is a section AA in FIG. 1. The lining includes a steel pipe 1 mounted in a vertical excavation 2 and concrete-coated with a layer of concrete 3 at a time with the rock 4. On the outer surface of the pipe 1, stiffening ribs 5 are arranged along spiral lines. Moreover, the spirals can be made as single-exit, and two or more entry. This is determined in each case by calculation depending on the diameter of the pipeline 1, the external load acting on it and the bearing capacity of the cross section of the stiffener 5.

The stiffeners are box-shaped, with their base directed down the shaft ..

The lining is erected as follows.

After driving the mine 2, a pipeline 1 is mounted in it with stiffeners 5 pre-welded onto it. Then, a concrete mixture is fed from the batcher located at the mouth of the shaft into the box-shaped stiffener, which flows by gravity into the lower part of the shaft by gravity. Moreover, due to the fact that the stiffeners 5 approach the horizontal sections of the shaft at an angle, the concrete mix fits snugly to the lower surface of the ribs without forming voids under the latter, which eliminates the need for injection holes to be made in the pipe shell (work under stiffeners.

Thus, the proposed steel-concrete lining of the mine allows to reduce construction costs and increase the operational reliability of the lining

ВНИИПИ Order 3855/25 Circulation 673 Subscription

Branch of PPP Patent,

Uzhhorod, Project 4,

4'4

fi9-1

Claims (1)

STEEL-CONCRETE SHAFT Lining, including concreted in verti-. a steel pipe with external spiral stiffening ribs, characterized by the fact that, in order to simplify the design, improve the quality of concrete and reduce labor costs for lining, the external spiral stiffeners are made in the form of a box placed with the base down and attached to one of the side walls to the pipeline.