RU124310U1 - TUBULAR ANCHOR FRICTION TYPE - Google Patents

Abstract

1. Friction type tubular anchor, including an outer tubular rod with a longitudinal slot along the entire length, an emphasis for a base plate, characterized in that an indelible spacer rod is installed inside the tubular rod. 2. Tubular anchor according to claim 1, characterized in that the non-removable spacer rod is made in the form of a pipe. Tubular anchor according to claims 1 and 2, characterized in that the tubular spacer rod has a longitudinal gap along the entire length.

Description

The utility model relates to the mining industry, namely to the fastening of the mine workings, in particular to the anchor support for weak rocks.

Known anchor support, including a rod, two flare nuts, two four-feather liners with protrusions, a clamp and a washer (see Shirokov AP Anchor support in the mining industry. Kemerovo Book Publishing House, 1973, p. 55-56).

The disadvantage of lining is the complexity of the design and manufacturing technology. In addition, fixing the anchor in the zone part of the well leads to unreliability when installing lining in complex rocks, where fixing the anchor rod in each separate layer of rock is required.

These disadvantages are eliminated to some extent in the tubular anchor support (see US patent No. 3922867 and No. 4313696, IPC E21D 21/00), including a tubular metal rod with a longitudinal slot along the entire length, compressing during compression.

The disadvantage of such an anchor lining is that for the elastic compression of the walls of the tubular anchor when pressing it into the hole, it is necessary to exert great efforts. This requires bulky jacks that develop a force of up to 150 kN or the use of powerful impact drills, the use of which increases the cost of installing anchor support. In addition, when a compressible tubular rod is pressed in or driven into a hole, the walls of the hole are destroyed, which subsequently reduces the bearing capacity of the lining.

Closest to the proposed utility model for the achieved result; namely, to reduce the destruction of the borehole walls with sufficient spacer force, the friction-type tubular anchor (see USSR author's certificate SU No. 1240910 A1, IPC E21D 21/00), in which an emphasis is fixed at the end of the tubular rod with a slit along the entire length for interaction with the mounting a rod (for example, a drill rod for drilling a hole).

Under the action of the force applied to the mounting rod, the tubular rod is not squeezed out, but drawn into the hole. Since when a tubular rod is pressed in, it is splitted into the hole, and when the tubular rod is retracted, the gap closes and the spacer force decreases, the force when installing the anchor is significantly reduced.

But this circumstance is also a disadvantage of the prototype and all tubular anchors with a longitudinal slot along the entire length, because during workloads (tension), the longitudinal gap is also closed, the spacer forces are reduced, and the load-bearing capacity of the anchor lining is reduced.

The technical result of using the claimed utility model is to increase the bearing capacity and reliability of the anchor.

In the known frictional type anchor containing a tubular rod with a longitudinal slot along the entire length, with an emphasis for the base plate, the technical problem is solved by the fact that an indelible spacer rod is installed inside the tubular rod. A non-removable spacer rod can be made: continuous, in the form of a hollow pipe or pipe with a longitudinal slot along the entire length.

When performing the spacer rod in the form of a pipe with a closing slot, the spacer rod must have the shape and dimensions of the outer pipe in contact with the walls of the hole.

Figure 1 shows a cross section of an anchor with a spacer rod of a solid section.

Figure 2 shows a cross section of an anchor with a spacer rod in the form of a hollow pipe.

Figure 3 shows a cross section of an anchor with a spacer rod in the form of a pipe with a longitudinal closing gap.

Figure 4 shows an anchor with a spacer rod in the form of a compressed outer tubular rod.

The friction-type tubular anchor consists of an outer tubular thin-walled rod 1 (hereinafter referred to as the tubular rod) with a longitudinal slit 2 along the entire length, with an annular stop 3 for the base plate 4. The non-removable spacer rod made in the form of a solid rod 5, a hollow pipe 6, a hollow pipe 7 with a closed slot 8 is placed inside the outer tubular thin-walled rod 1 inside the hole 9.

The friction-type tube anchor is installed as follows.

An outer tubular thin-walled rod 1, the diameter of which is slightly larger than the diameter of the hole 9, is pressed into the hole 9 with little effort without destroying its walls until the base plate 4 is pressed by the ring stop 3 to the working surface. The longitudinal gap 2 of the tubular rod 1 slightly closes.

The spacer forces acting in this case are sufficient to hold in the borehole 9 the anchor and the fastening elements of the mine (nets, tops, etc.), which are not shown in the drawings.

Then, inside the tubular rod 1 is pressed (driven) non-removable spacer rod, the diameter of which is greater than the inner diameter of the tubular rod 1.

The non-removable spacer rod of the anchor should be made in the form of either a solid section rod 5, or a hollow pipe 6, or a hollow pipe 7 with a closing slot 8 along the entire length.

Although the radial spacer forces arising from the introduction of spacer rods, transmitted through the thin walls of the tubular rod 1 to the walls of the borehole 9, are huge in size, the efforts to introduce non-retrievable spacer rods are insignificant due to the small value of the friction coefficient of the metal over the metal.

After installing the friction-type tubular anchor, tight contact of the tubular rod 1 with the walls of the hole 9 along the entire length of the anchor is created, which is a guarantee of an increase in the bearing capacity and reliability of the anchor.

During normal operation of the anchor, tensile forces are transmitted not only to the walls of the tubular rod 1, but also to the non-removable spacer rod (5, 6, 7) of the anchor due to friction forces, which constantly increase over time due to oxidation of metal contact surfaces.

A tubular anchor with a spacer rod of a solid cross-section, for example made of a cylindrical rod, is applicable in bore holes of small diameter.

The use of an external tubular rod as a non-removable spacer rod, which is possible with a certain width of the longitudinal slit, significantly simplifies the design of the anchor, reduces its metal consumption and price.

Claims (3)

1. Friction type tubular anchor, including an outer tubular rod with a longitudinal slot along the entire length, an emphasis for a base plate, characterized in that an indelible spacer rod is installed inside the tubular rod. 2. The tubular anchor according to claim 1, characterized in that the non-removable spacer rod is made in the form of a pipe. 3. The tubular anchor according to claims 1 and 2, characterized in that the tubular spacer rod has a longitudinal gap along the entire length.

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