EA015486B1 - Method of self-sealing damp-proof bulkhead erection - Google Patents

Abstract

The invention concerns mining engineering and may be used for isolation of wet ground of working from a mining zone. The method includes formation of a triangular profile cut along the contour of working and assembly of bulkhead from separate pieces. On the planes of the cut joint sealing inserts are fastened, wooden square and triangular elements with end parts that are sheared wedgewise in the form of the cut are installed, interelement moisture barriers are laid. The assembly of the bulkhead elements is completed with installation of square composite element into the cut; intracut and interelement joint sealing inserts are made of flexible material and/or solidifying sealant. In weakened, fractured, vulnerable to dissolution and other rock masses which do not secure sufficient mechanical reliability and are prone to filtration of water (brine) a cement screen around the bulkhead and/or reinforced concrete gantry between the bulkhead body and rock mass are additionally erected in the adjacent strata. If calculated values of hydrostatic head exceed the values allowed from the view point of strength and leakproofness of the bulkhead, as well as in order to reduce filtration into the protected zone of opening an additionalself-sealing damp-proof bulkhead is erected which fills the space between bulkheads with reinforcing and waterproof material, for example, concrete. The proposed method allows to raise efficiency of damp-proofing of workings.

Description

The invention relates to the mining industry and can be used to isolate a flooded section of an underground mine from a mining zone.

There is a method of erecting a rock lintel in a mine, including the construction of a mound of a lintel by the collapse of the roof with the formation of the bearing part, a filter layer and leaving the rock mass in the form of a trapezoid between the collapsed sections of the roof [1].

This method does not provide reliable waterproofing of the mine, requires a long time for the formation of a waterproofing layer and is intended mainly for carrying out hydro-laying works.

There is also a method of constructing a waterproofing lintel from standard waterproofing elements located along the output circuit and secured by hardening material [2] - a prototype.

The disadvantages of this method are the design complexity, significant manufacturing and installation time, high cost due to the use of numerous expensive waterproofing elements and the need to manufacture various types of waterproofing elements so that they can be adapted to the specific installation conditions of the jumper. In addition, under the influence of rock pressure, even with minor displacements of the rocks that enclose the mine, assembly difficulties will arise, and on the assembled bridge there is a risk of its depressurization due to deformations and the absence of the effect of self-sealing of element joints.

The objective of the invention is to increase the efficiency of waterproofing mine workings.

This object is achieved by the fact that in the method of constructing a waterproofing bridge, including creating a cut along the mine shaft contour and assembling it from separate elements, create a triangular profile cut with a vertex facing deep into the rock mass, intra-cut sealing gaskets are fixed on the cut planes and are installed with laying interelement waterproofing gaskets, wooden elements of a rectangular and triangular profile with end parts cut into a wedge in the form of a cut so that the end parts fit tightly with the mating planes into the cut, and use the elements of a triangular profile similar to the cut profile as extreme elements, laying them in the cut with the mating of the lateral planes, while the assembly of the jumper elements is completed by installing a composite element in the cut a rectangular profile with a tight fixation of both its parts, and the intra-cut and interelement sealing gaskets are made of an elastic material and / or hardening to a highly elastic state sealant.

In FIG. 1 shows a General view of the shaft self-sealing waterproofing lintels in section along the axis of the lintel perpendicular to the direction of the mine workings.

In FIG. 2 - section aa along the constituent element.

In FIG. 3 - cross section of the extreme element in the cut.

A self-sealing waterproofing bridge includes a shaft 1 formed by a shaft mine 2 cut 3 in the rock mass 4, intra-pipe sealing gaskets 5, waterproofing insulating elements 6, wooden elements of a rectangular profile 7, a triangular profile 8, a composite element 9 installed on the path of water inflow 10 , and may also include a concrete portal 11.

The method of construction of the shaft self-sealing waterproofing lintels is as follows.

If there is a danger of water inflow into the mine work zone along the contour 1 of the mine working 2, a cut 3 of a triangular profile with a vertex facing deep into the rock mass 4 is created. On the planes of the cut, for example, intrabar sealing gaskets 5 cut from elastic, hardening to a highly elastic state, are cut material, for example rubber, or made only by applying a sealant hardening to a highly elastic state; the extreme elements of the triangular profile 8 are installed, laying them in the cut 3, as shown in FIG. 3, and elements of a rectangular profile 7, while all elements are interspersed with inter-element waterproofing gaskets 6 and installed into the cut 3 with an interference fit, ensuring tight contact of the end parts cut to the wedge in the form of a cut 3 with the intra-cut sealing gaskets 5. Before installing the last rectangular composite element 9 wedge (unclench) neighboring elements and fix them, for example, using steel brackets (not shown in the figures) inserted into prepared from the guarded mine workings non-through holes in the adjacent element 9 integral with rectangular elements 7. The wedges (decompresses device such as a screw) is removed. In the resulting gap between the wedged (uncompressed) elements, the last, assembled, for example, by means of a bolted connection, a composite element 9 of a rectangular profile is mounted. First, install its part with embedded bolts from the side of the water inflow 10, and then on the waterproofing gaskets - the second part and tighten the nuts. After that, the clamps (staples) are removed, providing spontaneous, due to the elasticity of the inter-element waterproofing gaskets 6, pinching of the composite element 9 between adjacent elements.

- 1 015486

With the beginning of water inflow (brine inflow) into the mine workings, the wooden elements swell in contact with water (brine), their cross section increases, and the contact surfaces of the elements between themselves and the walls of the mine self-seal, providing reliable waterproofing of the protected part of the mine work 2. If there are concerns about water inflow did not materialize, the shaft self-sealing waterproofing bridge is dismantled in the reverse order and stored in the designated place, for example, in a special drift.

Elements of a shaft self-sealing waterproofing bridge are arranged vertically, as shown in FIG. 2 and 3, or horizontally. Preferably, the vertical arrangement of the elements to support the roof of the mine workings.

When constructing a shaft self-sealing waterproofing bridge in weakened, fractured, prone to dissolving, and other rock masses that do not provide sufficient mechanical strength and are prone to filtering water (brines), they additionally arrange a grouting curtain in the surrounding rocks around the bridge using one of the known methods, for example, by pumping mudding and cementing mortars through drilled wells to reduce the likelihood of filtering bypassing the bridge and strengthening the rock massif in the place of its construction. For the same purpose, an additional reinforced concrete portal 11 is arranged along the contour of the mine working 2 between the body of the bridge and rock mass 4.

When the design values of the hydrostatic pressure exceed the allowable jumpers under the condition of strength or tightness, and also to reduce the likelihood of filtering into the protected area of the mine workings, an additional self-sealing waterproofing bridge is constructed, filling the space between both jumpers with reinforcing and waterproofing material, for example concrete.

Thus, the set of essential features of the method of constructing a mine self-sealing waterproofing lintel provides a solution to the problem of increasing the efficiency of waterproofing mine workings and can be repeatedly used during mining in difficult hydrogeological conditions.

Information sources

1. Patent KI 2290514, publ. 12/27/2006

2. Application KI 93011303, publ. 10/10/1995, the prototype.

Claims (4)

CLAIM 1. A method of constructing a self-sealing shaft waterproofing lintel, including creating a cut-out along the mine working contour and assembling it from individual elements, characterized in that along the mine working contour a cut-off of a triangular profile is created with the apex facing the depth of the rock massif; on the planes of the cut fix the intra-pipe sealing gaskets and install with the laying of inter-element waterproofing gaskets made of wood elements of a rectangular and triangular profile with the end parts cut into a wedge in the form of a cut, so that the end parts tightly, with the conjugation of the planes, fit into the cut, and As extreme elements, elements of a triangular profile, similar to the profile of a cut-off, are used, placing them in a cut-piece with the mating of side planes, while assembling elements The shortcaps are completed by installing a rectangular profile composite element into the notch with hermetic fixation of both its parts, and the intra tube and inter-element sealing gaskets are made of elastic material and / or sealant that hardens to a highly elastic state. 2. The method according to claim 1, characterized in that the weakened, fractured, prone to dissolution and other rock masses that do not provide sufficient mechanical strength and are prone to filtering water or brines, additionally arrange in the enclosing rocks a cement grout around the lintel. 3. The method according to PP.1 and 2, characterized in that it additionally arrange a reinforced concrete portal along the contour of the mine workings between the body of the lintel and the rock mass. 4. The method according to PP.1-3, characterized in that when the calculated values of the hydrostatic pressure, exceeding the permissible strength or tightness of the jumper, as well as to reduce filtration in the protected area of the mine workings, an additional shaft self-sealing waterproofing bridge is constructed, filling the space between the two lintels hardening and waterproofing material, such as concrete.