EP0248189B1 - Device for making a slit - Google Patents

Description

The invention relates to a device for producing a slot by means of a drilling and / or milling tool, which is driven by a motor and moved along the intended path of the slot. In particular, the invention relates to a device for producing a slot in rock, the slot in the manufacture of daytime in particular freezer or blind shafts and in the case of mining excavation of underground routes on the periphery of the same mostly to be made arcuate and the slot serves as a pressure transmission lock to prevent the spread of explosive vibrations in the surrounding mountains.

Vibration transmissions into the surrounding mountains currently lead to damage to the freezer pipes, particularly when freezing shafts are sunk. When blind shafts, as well as sections and tunnels with drilling and blasting work are excavated, the rock on the circumference of the rock is so severely destroyed that unintentional additional outbreaks and rock fall can result in considerable disabilities and economic disadvantages in securing the mountains.

According to the current state of the art, the production of slots, e.g. B. in a shaft, only possible with the help of a chain cutter with cutter arm. Such machines were developed from the proven stone cutting machines for a shaft with a diameter of approx. 10 m. It is positively guided on a rail guide. Because of the circumferential cutting chain, the cutting sword must have a minimum width and can therefore z. B. for cutting smaller arcs. This saw is therefore not suitable for use in road jacks for cutting circumferential slots with different arc radii on ridges and joints. Another disadvantage is that the flat and relatively wide construction of the saw blade tends to cut and dodge in the tangential direction, which means that there is a certain tendency for jamming when forcedly guided on an arch (company brochure about "stone cutting machines" from Maschinenfabrik Korfmann type ST 50S).

Another possibility for the production of slots in the rock is a chain slot saw type SB 1200/1300 developed by the BGR (Federal Institute for Geosciences and Natural Resources) in Hanover, but which is only able to produce straight slots. The cutting chain is guided on two guide tubes in circumferential bores. It is therefore not to be used for sawing horizontal or inclined to vertical arch slots (final report on the research project KWA 5103 0 of the BGR, Ref. 2.11 rock mechanics and building geology, archive no. 97 997).

Other machines for producing straight slots, in particular for undercutting coal and other rock, are known from Eickhoff, Bochum (until approx. 1975) and from Joy, Machinery Company, Pittsburg / USA. Because of their forced guidance on tank conveyors or on loaders, they cannot be used for the purposes described. (Special reprint from "Montan-Zeitung" No. 12, Dec. 1951 and 2. Joy Manufacturing Company, Pittsburg, Bulletin No. C 74, M-40 706).

Other devices for slot production for undercutting coal are known (DE-C 3 236 994 and DE-C 2 246 233). These devices are also pulled by traction devices and are not suitable for making the slots in shafts, lines, etc. mentioned at the beginning.

Another method for slot drilling is known from patent DE-C 3 040 057. Here, the slots are produced by drilling a plurality of drill holes arranged next to one another, depending on the expansion of the slot. The ribs between the drill holes are very annoying when inserting finishing material. It is a process that is not suitable for the problems described and is also very uneconomical.

From US-A 3 305 271 a device for producing a slot by means of a drilling and / or milling tool is also known, which can be driven by a motor and moved along the intended path of the slot. The device can only be operated so that the drill head is always aligned horizontally.

FR-A 1 224 143 describes a simple cutter bar without lowering or propulsion device, which is operated at an angle to the mountain surface.

The object on which the invention is based is to expand the device according to DE-C 3 040 057 in such a way that with it also arch slots e.g. can be carried out in rock as a milling aid or that it can be used in natural stone extraction.

The solution is described in the characterizing features of claim 1.

The remaining claims represent advantageous developments of the invention.

The slot produced by the device according to the invention in a manner that is gentle on the mountains by milling brings in particular the advantage of a smooth mountain surface on which the mountain protection (expansion) in the form of masonry, steel arches with a delay or the like. can be brought close to the mountains. By avoiding unintentional additional outbreaks, expensive backfill material (shotcrete or similar) can be dispensed with. In the extraction of natural stone in the form of angular, in particular rounded blocks, the slot device is very suitable for the production of arcuate slots, since the rotating and over the entire length with cutting or. Hollow rods equipped with milling tools can also be guided on very small radii.

The inventive device for producing slots, for. B. Arch slits in the rock therefore consists of one equipped with cutting or milling tools and a transport spiral Hollow linkage, which is pushed into the rock by a drive unit in a rotational movement and by a lowering or feed device. The linkage is moved either parallel to it or around it on any path by means of a guide device and thus mills out the desired slot. The production of arch slits is therefore possible without any problems. The loosened drill or cut material is removed mechanically or by means of a flushing medium through a flushing device. Vertical to horizontal slots can be made.

The invention is explained below with reference to an embodiment using FIGS. 1 and 2.

The device shown in FIG. 1 consists of a carrier body 1 in the form of a hollow rod with an external transport spiral 2, which is equipped with cutting or milling tools 3 completely or at least in the front region (as shown) and on the conical end face 19 on the spiral foot and the spiral outer side is. For this purpose, the carrier body 1 can be made of two (or more) parts 13, 14, which are screwed together at the seam 11 so as to be resistant to bending.

With the help of the drive 4 and a lowering or feed device 5, the drilling and milling spindle 1 - 2 via the drive shaft 15 or the linkage 20 z. B. at the shaft or route periphery 17 (see FIG. 2) in the mountains 16. The cuttings are discharged via the helix 2 and sucked off at the mouth of the borehole with the feed direction pointing vertically downwards.

The hollow rod 1 for the slot production is moved on the circumference of the shaft 17 with the guide device 6, 6, the cutting or milling rod 1 - 3 rotating at a speed adapted to the hardness of the rock and with a corresponding pressure. Cooling the cutting or Milling tools 3 are carried out by means of liquid or air rinsing via a rinsing head 7 on the drive shaft 15 and lines 12 through the hollow linkage with outwardly directed, spaced-apart outlet nozzles 8. The milled material ejected into the annular gap 18 is mechanically or by a following suction device 9 ( see Figure 2) removed. In special cases, however, the cut material can also be sucked off through the hollow rod via the nozzles 8, line 12 and flushing head 7.

The device has the advantage that the hollow rod 1 in a rotating manner by the guide means 6, 6, arcuate, for. B. can be moved on the circumference of the shaft or section, the annular gap 18 being produced in the mountains 16. The rotational movement of the cutting or milling arm prevents jamming during arc cutting. The loosened cut material is removed mechanically or by a suction device from the annular gap 18, so that a direct pressure wave transmission to the outer rock jacket 16 can no longer take place when the inner shaft or section body is blown up.

The device is also advantageously suitable due to the ability to mill narrow arch slots, not only to produce natural stones as straight-edged blocks, but also as cylindrical blocks.

Claims (3)

1. Device for making a slit, utilising a drilling and/or milling tool which is motor-driven and is moved along the intended path of the slit, comprising

a) a rotatable supporting body (1), which is preferably cylindrical in shape, for supporting

b) a helical displacement means (2) and the drilling and/or milling tools (3);

c) a lowering or advancing means (5) for the supporting body (1); and

d) a guide means (6, 6') for guiding the lowering or advancing means (5), together with the supporting body (1), along the path; characterised in that

e) the helical displacement means (2) and the drilling and/or milling tools (3) are disposed on the surface of the supporting body (1) in such a manner that the drilling and/or milling tools (3) form a continuation of the helical displacement means (2) or even fully occupy the helical displacement means (2);

f) the supporting body (1) is formed from a hollow drill pipe; and

g) conduits (8, 12) are provided in the supporting body (1), via which condutis cooling fluid can be supplied to the drilling and/or milling tools (3) or drill chips can be removed by suction.

2. Device according to claim 1, characterised in that

h) the supporting body (1) can be assembled from individual component parts (13, 14) so as to be resistant to bending.

3. Device according to claims 1 and 2, characterised in that

i) the guide means (6, 66) is in the form of a railtype guide means or is adapted to be rotatable, pivotable and telescopable.

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