PL201380B1 - Flexible anchor - Google Patents

Abstract

A flexible anchor for securing excavations at risk of rock bursts, the rod with a resistance element of which is placed in a pipe glued into the rock mass, characterized in that it has a conical-cylindrical resistance element (2) with a breakaway fuse (6), terminated with a head (7) closing the pipe (3).

Description

REPUBLIC

POLAND

Patent Office of the Republic of Poland (12) PATENT DESCRIPTION (19) PL (11) 201380 (13) B1 (21) Application number: 374565 ^{(51) Int.Cl.}

E21D 21/00 (2006.01) (22) Date of notification: 21/04/2005 (54)

The anchor is flexible

(43) Application was announced: 30.10.2006 BUP 22/06 (73) The right holder of the patent: Central Mining Institute, Katowice, PL (45) The grant of the patent was announced: April 30, 2009 WUP 04/09 (72) Inventor (s): Zbigniew Barecki, Zabrze, PL Andrzej Nierobisz, Zabrze, PL Wojciech Masny, Katowice, PL Arkadiusz Grim, Bytom, PL

^{(57) A} flexible bolt for securing workings at risk of rock bursts, the rod with a retaining element is placed in a pipe glued to the rock mass, characterized by the fact that it has a conical-cylindrical thrust element (2) with a breakaway safety (6) ending with a head (7) closing the pipe (3).

PL 201 380 B1

Description of the invention

The subject of the invention is a flexible bolt for securing workings threatened with rock bursts.

It is known, for example, from the prior art disclosed in US Patent No. 5,882,148 to inflate a bolt by placing a standard bolt rod in a pipe glued to the rock mass and providing it with a cone-shaped abutment element. During the collapse, the cone is pulled through the pipe, which ensures a partial extension of the rod and eliminates the possibility of breaking the bolt.

A flexible bolt for securing workings threatened with rock bursts, the rod of which with a thrust element is placed in a pipe glued to the rock mass, according to the invention, has a conical-cylindrical abutment element with a breakaway safety device, ending with a pipe closing head.

The anchor according to the invention, after gluing the pipe to the rock mass, works as a rigid anchor. The crash causes the breakaway strength of the fuse to be exceeded and the anchors become a flexible bolt. The conical-cylindrical formation of the abutment element increases the friction when it is pulled through the pipe, ensuring the appropriate load capacity of the bolt. Closing the pipe with a breakaway fuse head protects against harmful penetration of the adhesive substance into its interior.

The subject of the invention is shown in an exemplary embodiment in the drawing, showing a longitudinal section of a hole in the rock mass with an anchor glued in.

A flexible anchor for securing workings at risk of rock bursts, has a rod 1 with a conical-cylindrical abutment element 2. The rod 1 is placed in a pipe 3 glued to the rock mass, on the outer surface of which there are grooves 4 for better bonding with the adhesive substance 5. Conical - the roller thrust element 2 has a breakaway fuse 6, with a diameter smaller than the diameter of the rod 1, ending with a head 7 that closes the pipe 3, with a diameter greater than the internal diameter of the pipe 3. At the other end of the pipe 3 there is a gasket 8 preventing leakage of the adhesive substance 5 beyond the pasting segment. To the head 7 of the breakout fuse 6 is attached a trapezoidal stirrer 9 made of a flat bar, whose task is to pierce the adhesive load and mix it well. The end of the rod 1 protruding from the rock mass has a thread 10 for a nut 11 pressing against the roof 12 of the excavation flat washer 13.

Claims (1)

Patent claim A flexible anchor for securing workings at risk of rock bursts, the rod of which with a retaining element is placed in a pipe glued to the rock mass, characterized by the fact that it has a conical-cylindrical thrust element (2) with a breakaway safety (6) ending with a head (7) closing the pipe (3) .