DE2648477A1 - COMPLEX SHAFT EXPANSION FOR MINING - Google Patents

Description

.ί; - ΓΙ ι Vi.

Politechnika Wroclawska October 26, 1976

Wroclaw / Poland WHu

PL 2403

Complex shaft extension for mining

The invention relates to a complex shaft extension for the Mining, which is particularly difficult to see under hydrogeological conditions Conditions apply, especially in the case of the mining of storage resources contained in shaft pillars. The shaft lining according to the invention is complex, flexible (elastic) and tight (impermeable).

A shaft lining for mining is known, which is characterized by a composite structure and tightness and consists of two concentric steel cylinders arranged one inside the other, with the space between them is filled with cement concrete. These cylinders are made up of annular track sections that connect to each other both have been welded on the transverse edges as well as on the longitudinal edges. The shaft is expanded by lowering it the expansion sections previously connected over days (on the surface).

This type of expansion is due to insufficient flexibility (elasticity) characterized, which causes a reduction in the immediate

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bar next to the shaft is impossible, resulting in significant losses of up to 30% of the minable Minerals are created. This type of expansion also requires the use of corrosion-resistant high-quality steel sheets. When installing this expansion, technological difficulties associated with the production arise, in particular in the production of uninterrupted and tight welded joints, their checking under the conditions is particularly difficult in mining.

The object of the invention is to provide a composite shaft support indicate that does not have the disadvantages of the prior art and on the use of expensive corrosion-protected Steels are dispensed with and yet leak-proof and it is allowed to carry out the dismantling into the expansion area.

The task is in a complex shaft lining for mining, which contains a layer made of cement concrete, solved according to the invention in that the shaft lining consists of at least one composed of at least two layers Element consists, with one - the outer layer of a ring of concrete without cement with a binder on. the base of polyester resins close to the other - the inner layer - which consists of a cement-concrete hanging, connected is. Prestressing cables are built into the inner layer together with insert pipes. It is an advantage if the Outer layer on the one interacting with the inner layer

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Page has at least two technological niches. In the event that the shaft extension consists of two or more Elements to be assembled, known flexibility joints are preferably used between the individual elements, the two ring-shaped, one lower and an upper, tightly interconnected bowl is formed, in the horizontal walls of which there are at least four openings provided for inserting the prestressing cable ends are made and arranged on the circumference of this bowl.

The shaft lining according to the invention is made possible by its resilience obtained by prestressing the inner layer a trouble-free work of the shaft extension at at least 3.5 times smaller than the known solutions Bending radii of the shaft extension. This gives the possibility of .the. Previously in the so-called safety pillars mine remaining deposits with usable minerals, which comprise up to 30% of the total deposit. With Consideration of the fact that the cube compressive strength of the material of the pre-stressed inner layer at least 80% larger compared to the non-pre-stressed, previously at the layer used in the known shaft extensions, it is possible to reduce the thickness of the shaft extension wall, which in turn also leads to a reduction in the excavation work required and thus also to a lowering of the Setup costs of a shaft extension leads. In addition, the shaft lining according to the invention is characterized in

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that it is completely tight, which is the need for sealing excludes during operation, which is an expensive and often ineffective operation. Improved as a result a dense shaft expansion the mining conditions, as well as the conditions of the shaft ventilation and air conditioning. Thanks to the tightness, the energy expenditure for pumping the infiltration water, what at a use of the known shaft extensions is absolutely necessary, the operating costs incurred away. That for them The material used on the outer layer of the shaft lining significantly reduces the risk of corrosion, Was it positively influenced the stability of the shaft construction and helps to lower operating costs'.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawings. It shows

1 shows a shaft extension from one element in longitudinal half-section,

Fig. 2 shows a shaft extension made of two elements, also in longitudinal half-section.

example 1

The first embodiment is one composed of one element Shaft lining, the element being made of a ring-shaped, concrete without cement with a polyester binder Inner layer 1 and one made of cement concrete with port

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land cement made inner rail 2 analog form. In the outer layer 1 there are two on the circumference of the inner surface Technological niches 3-Inside that are arranged in the outer layer 1 and filled with the material of the inner layer 2 The inner layer 2 is fitted with insert tubes 4- in which prestressing cables 5 are located. The pre-stressing cables 5 are by means of screws 6 and two pads 7 in the form of flat, in the upper and lower part of the inner layer 2 arranged rings stretched. The outer layer 1 of the shaft lining has a protruding shaft base 8 at the bottom, which is designed to protrude into the rock 9.

The shaft lining according to the invention is manufactured in the following way.

First of all, the outer layer 1 is made by partially filling a boarded tree with a semi-liquid mass made of concrete without cement, the section lengths depending on the existing mining conditions to get voted. After the outer layer 1 has hardened, production is also carried out in sections by casting with cement concrete the inner layer 2. Before that was the one intended for pulling Tree boarded, with the insert pipes 4 and the prestressing cables 5 being mounted at the same time. After complete When the cement hardens, the inner layer 2 is braced by tightening the screws 6 which are attached to the threaded ends of the cables 5 are screwed on and are supported against the supports 7.

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In the case of an execution of the shaft extension with an outer and an inner layer 1 and 2 from the materials mentioned, the other

laid cable tension at least 1200 kg / cm.

As a result of the operations described, a flexible and tight complex shaft lining for mining is obtained, which is particularly suitable for the extension of the side shaft.

Example 2

The second embodiment is according to the invention Shaft extension from two elements that are constructed identically to the element described in the first example, with the difference that the outer layer 1 does not have a shaft foot 8 and that there are no supports 7 under the screws 6 are provided. At the point where the highest mining income is expected is between the two shaft support elements arranged a compliance hinge known in the mining industry. The compliance hinge is tight in the form of two one on top of the other, matched, ring-shaped bowls, an upper bowl 10 and a lower bowl 11, which are simultaneously the tension frame for the Form biasing cable 5. There are specially made holes in the horizontal walls of the bowls 10 and 11, which are arranged symmetrically on the circumference and into which the ends of the prestressing cables 5 screwed with screws 6 are inserted will.

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The shaft lining elements are manufactured in the same way as the element described in Example 1. The I flexibility joints are mounted in a known manner, after which the prestressing cables 5 are tensioned against the horizontal walls of the bowls 10 and 11 by tightening the screws.

The obtained shaft extension is due to its flexibility and tightness marked and especially intended for difficult conditions, such as the dismantling of shaft pillars.

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Claims (3)

Claims 1. Complex shaft construction for mining, which contains a layer made of cement concrete, thereby characterized that they consist of at least one element composed of at least two layers (1, 2) consists, with one layer - the outer layer (1) ■ consisting of a ring made of concrete without cement with a binder the base of polyester resins, dense with the other layer - the inner layer (2) - which consists of an entrance Cement concrete is connected, whereby in the inner layer (2) "prestressing cable (5) together with insert pipes (4-) are arranged. 2. Shaft support according to claim 1, characterized in that the outer layer (1) on the one with the inner layer (2) cooperating side at least two technological . Has niches (3). 3. shaft support according to claim 1 or 2, characterized in that between the elements of the shaft support known flexibility joints are located, which consist of two 709822/0274 ORIGINAL INSPECTED " ² - In (10, 11) exist, in their horizontal Walls at least four on the circumference of these bowls (10, 11) arranged for inserting the ends of the Pre-tensioning cable (5) are provided. 709822/0274