CN2318399Y

CN2318399Y - Double-anchor-head rockbolt

Info

Publication number: CN2318399Y
Application number: CN 98201204
Authority: CN
Inventors: 伍厚荣; 刘富安; 余玉江
Original assignee: HUAYINGSHAN MINE ADMINISTRATION BUREAU
Current assignee: HUAYINGSHAN MINE ADMINISTRATION BUREAU
Priority date: 1998-02-11
Filing date: 1998-02-11
Publication date: 1999-05-12
Anticipated expiration: 2008-02-11

Abstract

The utility model relates to a double-anchor-head rockbolt. Two anchoring heads are respectively loaded in the front and the back ends of an expanding casing, and the rear anchoring head is shocked through a special tool causing the front and the back ends of the expanding casing simultaneously to expand along an expanding joint. After the expanding casing is expanded to a definite degree, the expanding casing and the wall of a hole generate a large friction force, and then a rockbolt liner plate and a retaining nut are arranged. When the retaining nut is continuously rotated, a primary anchoring force of the rockbolt is continuously enlarged until achieving 100 kN to 150kN. So the primary anchoring force of the double-anchor-head rockbolt is enhanced approximately two times as the primary anchoring force of a single-anchor-head rockbolt. When the screw connection is used for a rockbolt body and a front anchoring head, the recovery reusability of the rockbolt body can be achieved. Because the antisepsis measure is used in a connecting hole of the anchoring head and the section of screw threads of the rockbolt, the recovery rate of the rockbolt is enhanced.

Description

The Double-anchor-head anchor pole

The utility model relates to a kind of suitable country rock engineering support anchor pole, and it is particularly suitable for underground country rock engineering support and uses.

At present, be used for the anchor pole that the country rock engineering support is used, its anchorage style mainly contains two big classes, i.e. full length fastening and end anchoring rod.In the end anchoring rod, all be to adopt unidirectional anchorage style, the anchor pole of unidirectional anchorage style exists first anchor-hold lower, to the reinforcement supporting effect that country rock is early stage relatively poor (as Chinese patent 91207159.1).

The utility model is to design a kind of Double-anchor-head anchor pole of realizing the front and back bidirectional anchoring, makes it to reach anchored force height just, and country rock is strengthened the good purpose of supporting effect.

The utility model is achieved in that a kind of Double-anchor-head anchor pole, and it constitutes (see figure 1) by preceding anchor head, the shell that expands, back anchor head, the body of rod, supporting plate, nut etc.The centre of anchor head is processed with the internal thread (see figure 2) before it is characterized in that, is used for being connected with the body of rod, and preceding anchor head is pre-large post-small bullet.Centre at the back anchor head is processed with through hole or screw thread (see figure 3), is used for by the body of rod, and back anchor head is pre-small post-large bullet.Rear and front end at the shell that expands respectively has 3 dilatation joint (see figure 4)s, and the shell so that forward and backward anchor head distending expands makes expand shell and the anchor pole hole wall generation anchored force that is closely linked.

The utlity model has following advantage: adopt the forward and backward anchor head shell two ends distending that will expand simultaneously, increased the contact area of bloated shell and hole wall, make it to increase substantially, reach the purpose that adds strong supporting in early days, thereby enlarged the scope of application of bolt support than the anchored force of single anchor head anchorage style.Simultaneously, the body of rod adopts with anchor head and is threaded, and the recovery of being convenient to the body of rod is multiplexing, helps reducing cost: cut the waste.When the body of rod was not considered to reclaim, the preceding anchor head and the body of rod also can adopt welding.

Below in conjunction with accompanying drawing the utility model is described further.

Fig. 1 is anchor pole overall structure figure.

Fig. 2 is preceding anchor head figure.

Fig. 3 is back anchor head figure.

Fig. 4 is the shell figure that expands.

Fig. 5 is the shell-side view that expands.

In Fig. 1, (1) is preceding anchor head, and (2) are the shell that expands, and (3) are bolthole, and (4) are the back anchor head, and (5) are the body of rod, and (6) are supporting plate, and (7) are nut.In Fig. 4, (8), (9), (10) are the shell front end dilatation joint that expands, and (11), (12), (13) are the shell rear end dilatation joint that expands.

As shown in Figures 1 to 4, installation and application of the present utility model is: first is respectively charged into the front and back end of bloated shell (2) with preceding anchor head (1) and back anchor head (4), then the body of rod (5) is screwed in the internal thread bottom to preceding anchor head (1).Second the anchor head that assembles sent into the hole of bolthole (3) by the body of rod at the bottom of.The 3rd usefulness special tool impacts back anchor head (4), to expand after making preceding anchor head (1) and back anchor head (4) simultaneously stressed dilatation joint (8), (9), (10), (11), (12), (13) distending simultaneously of front and back ends of shell (2) is till the shell (2) that expands is combined closely with the hole wall of bolthole (3).The 4th is enclosed within the anchor bar body afterbody with supporting plate (6) and nut (7), with the continuous rotating nut of instrument (7), to the expand further distending of dilatation joint of shell (2) of anchor head (1) before the body of rod (5) just drives, the anchored force of anchor pole rises thereupon significantly, till rising to the first anchored force (being generally 100-150kN) of design, this moment, anchor pole installed.

Reclaim for the ease of the body of rod, before the body of rod (5) is screwed in anchor head (1) before, an amount of anti-corrosive grease of in the hole of forward and backward anchor head, packing into.When the country rock engineering is scrapped, the body of rod (5), supporting plate (6), nut (7) can be reclaimed multiplexingly, its recovery method takes off supporting plate (6) for to turn round lower nut (7) with spanner, turns round down the body of rod (5) with spanner again, and recovery finishes.

Claims

1, a kind of Double-anchor-head anchor pole, by preceding anchor head (1), the shell (2) that expands, back anchor head (4), the body of rod (5), supporting plate (6), nut formations such as (7), it is characterized in that being connected with preceding anchor head (1) on the screw thread of the body of rod (5) front end, preceding anchor head (1) is pre-large post-small bullet, on the rear end of bloated shell (2) back anchor head (4) is arranged, the pre-small post-large bullet in back anchor head (4) lining is processed with through hole or screw thread at the center of back anchor head (4), and the rear and front end of the shell (2) that expands has dilatation joint.

2,, it is characterized in that the body of rod (5) and preceding anchor head (1) also can adopt welding method to be connected according to the described Double-anchor-head anchor pole of claim 1.