SU1442627A1 - Apparatus for drilling square holes - Google Patents

Abstract

The invention relates to the mining and construction industry. The goal is to reduce the energy intensity of drilling. The auger bit (SB) with a screw tape 2 and a knife 4 is connected by a leading piece of 1ngoy 5 to a drive. A profile frame 7 with cutting edges 8 on the bottom end is mounted on the shaft 3 of the ballast block. On the rod 5 is made eccentric 9, placed between the frame 7 and the SB. On the eccentric 9, the hub I is rotatably mounted with blades 12, 13 fixed on it, the latter are displaced among themselves along the height of the hub 11 with the formation in the plan of a triangle a constant width. The width of this triangle is equal to the diameter of the SB. As the ball penetrates, the blades 12 and 13 rotate counterclockwise and, at four diametrically opposite points, cut into the wall of the cylindrical pilot well, expanding it to a square cross-section by trimming thin rock layers. With further deepening, the edges 8 of the frame 7 smooth out the walls of the shururf. The ground cut by blades 12 and 13 and edges 8 is poured onto tape 2 and rises to the surface. 1 hp f-ly, 2 ill. and (lu oi to

Description

The invention relates to the mining and construction industries, and more specifically to the penetration of square cross-section mines for a crown support for geological surveys and for the installation of piles and foundations in construction.

The purpose of the invention is to reduce the energy intensity of drilling.

FIG. 1 shows a device for drilling square lugs, a general view; in fig. 2 shows section A-A in FIG. one.

The device contains auger drill with a drill 1, a screw tape 2 wound on shaft 3, and a knife 4. A drive rod 5 is rigidly and coaxially connected to the shaft 3 of the auger drill, on which a square profile frame 7 is mounted through radial-stop bearings 6 cutting edges 8 at its bottom. An eccentric 9 is made on the driving rod 5 between the profile frame 7 and the auger drill, on which the hub I is mounted for rotation through the bearing 10. Three blades 12-14 are fixed on the latter. Each blade lies in the diametral plane and its tip is directed radially from the axis of the device. In terms of each of the blades, it constitutes the third part of a triangle of constant width (triangle, nick Relo) and is offset in height of the hub 11 one relative to another, i.e. blade 12 is fixed in the lower part of the hub 11, blade 13 in the middle, and blade 14 in the top. The radius of the edges of the blades is equal to the diameter of the knife auger drill, i.e. pilot hole diameter.

A device for drilling square holes works as follows.

Using adapter 15, the device is connected to a drive (not shown) and lowered to the hole drilling point. Then begin to rotate the device (usually clockwise). The auger drill, in the process of drilling, forms a leading cylindrical bore with a diameter D. On the measure of the auger drill bits, they enter into operation

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Blades 12-14, which, when braked by the resistance of the soil, begin to rotate counterclockwise and, at four diametrically opposite points, cut into the wall of the cylindrical pilot well, expanding it to a square section by cutting thin rock layers. With further deepening, the cutting edges 8 of the square profile frame 7 come into contact with the ground and during their downward motion they clean the walls of the hole. The soil cut by the blades of the hub 11 and the edges 8 of the profile frame falls on the screw tape 2 of the auger drill, which periodically rises together with the soil to the surface where it is cleaned. When the device is in operation, the profile frame 7 also serves as a centralizer.

If necessary, using the device, you can drill holes with a cross section in the shape of any regular polygon, and the number of blades on the hub should be one less than the number of angles in a regular polygon.

Claims (2)

Invention Formula I. A device for drilling square holes, including auger drill with a screw tape and a knife, connected by a driving rod with a drive, and a profile frame mounted on a shaft of a screw drill with cutting edges at the bottom end, characterized in that, in order to reduce the energy intensity of drilling, it is equipped with a hub with blades rigidly fixed on it, and an eccentric placed between the profile frame and auger drill is made on the leading shaft, the hub is rotatably mounted on the eccentric, and the blades are displaced between oh along the height of the hub with the formation in terms of a triangle of constant width. 2. A device according to claim 1, characterized in that the width of a triangle hub of a constant width formed by the blades is equal to the diameter of the auger drill. / - // 74 0 12 (rig 2