JP2857625B2 - Bolt cable holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable holder used for cable bolting, which is a method for reinforcing a soft rock layer of a wall or a roof at a mining site or a tunnel.

[0002]

2. Description of the Related Art Cable bolting is a method in which a plurality of steel wires are bundled into a drilled hole provided with cement grout and a torsion cable is inserted and fixed to reinforce the soft rock layer. However, it is necessary to prevent the cable for bolting inserted into the drilled hole provided with cement grout from falling off during the curing period. For this reason, conventionally, a part of the bolting cable inserted into the drilling hole is bent, and the bent portion is inserted so as to bite into the inner wall surface of the drilling hole.

[0003]

In the conventional method as described above, a special mechanical device is required to bend a part of the cable for bolting having extremely high rigidity and elasticity, which requires much labor and time. Not only was it costly, but it was difficult to keep the cable concentric with the borehole.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a holder for a cable for bolting which can solve the above-mentioned conventional problems. A holding tool for attaching a plurality of steel wires 17 to a bundled and twisted bolting cable 16 and attaching the steel wires 17 to a steel plate by bending the steel plate into a C-shaped section. And a plurality of locking extension pieces 2a to 2c. The main body 1 is integrally formed with the main body 1 so as to open outward from both sides of an opening 3 parallel to the axial direction thereof. The first and second guide pieces 4a and 4b are formed by cutting the peripheral wall 5 of the main body so that the tip 6a projects obliquely inside the main body 1 in one axial direction. The fixing tongue piece 6 and the tip 7a are inclined inside the main body 1 with the other end in the axial direction. A second fixing tongue piece 7 formed by cutting the peripheral wall 5 of the main body so as to protrude is provided, and the extension pieces 2a to 2c for locking are separated from one peripheral edge of the main body 1 in the axial direction. It is configured to be continuously connected in an open radial manner.

More specifically, the first and second two fixing tongue pieces 6, 7 are connected in series in the axial direction of the main body 1 so that the tips 6a, 7a face each other. It can be formed by two substantially D-shaped cuts 9. In this case, the first and second two fixing tongue pieces 6 connected in series are also provided.
7 are disposed symmetrically with respect to an imaginary plane 10 passing through the center of the opening 3 passing through the axis of the main body 1 and parallel to the axial direction, and the opening between the pair 11a and 11b. The center angle on the side opposite to the side where 3 is located can be approximately 220 degrees.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. The cable holder shown in FIGS. 1 and 2 includes a main body 1 and three locking extension pieces 2a. To 2c. The main body 1 is formed by bending a steel plate into a substantially C-shape, and fitting guide pieces 4a, 4b are integrally connected from both sides of an opening 3 parallel to the axial direction so as to open outward. Further, a first fixing tongue piece 6 formed by cutting the main body peripheral wall 5 so that a tip of the main body peripheral wall 5 protrudes obliquely into the main body 1 with one end facing one axial direction.
And a second fixing tongue piece 7 formed by cutting the peripheral wall 5 of the main body so that the distal end projects obliquely into the main body 1 toward the other side in the axial direction. 8 is a through hole.

The first and second two fixing tongue pieces 6, 7
As shown in FIG. 1C, is formed by one substantially D-shaped cut 9 so as to be in series in the axial direction of the main body 2 and to have the tips 6a and 7a facing each other. And
The pair of the first and second two series of fixing tongue pieces 6 and 7 are aligned with the imaginary plane 10 passing through the axis of the main body 1 and passing through the center of the opening 3 parallel to the axial direction. Symmetrically arranged,
The center angle θ between the pair of tongue pieces 11a and 11b on the side opposite to the side where the opening 3 is located is approximately 220 degrees.

The extension pieces 2a to 2c for locking are attached to the main body 1
The one extending piece 2a is arranged at a position where the imaginary surface 10 passes through the center of the width, and the other two extending pieces 2b, 2c
Are symmetrically arranged with respect to the virtual plane 10.

As shown in FIG. 6, the cable bolting method includes a cable insertion hole 1 in a rock layer 13 to be reinforced.
After excavating the cable 4 and filling the cable insertion hole 14 with the cement mortar 15, the cable 16 for bolting is inserted.
As shown in the figure, seven steel wires 17 are connected around one steel wire by 6
The steel wires are bundled so as to surround them, twisted, and integrated. Accordingly, the surrounding steel wires 17 are arranged in the circumferential direction at intervals of 60 degrees.

Before the cable 16 is inserted into the cable insertion hole 14 provided with cement grout, the cable holder of the present invention may be provided at an appropriate position in the longitudinal direction of the cable 16, preferably the cable insertion hole. Attach it at the place corresponding to the vicinity of the entrance 14. Specifically, a pair of outwardly opening fitting guide pieces 4a and 4b in the cable holder are provided.
Cable 1 so that cable 16 abuts in parallel between them.
The body 1 of the cable holder is pressed against the cable 6 and the body 1 is strongly pressed against the cable 16 in this state, so that the pair of outwardly-opening fitting guide pieces 4a and 4b are moved left and right against elasticity. The cable 16 is opened and the cable 16 is relatively fitted inside the main body 1. At this time, the direction of the cable holder is determined so that the extension pieces 2a to 2c for locking of the cable holder extend rearward in the cable insertion direction (the direction of the arrow X) as shown in FIG. .

The main body 1 is connected to the cable 16 as described above.
As shown in FIG. 5, the ends 6a, 7a (see FIG. 1C) of the fixing tongues 6, 7 of the pair of tongues 11a, 11b projecting inside the main body 1 as shown in FIG. The inner diameter of the main body 1 and the positions of the tips 6a and 7a of the fixing tongues 6 and 7 are set so that the main body 1 does not completely elastically return to the original shape when pressed against the steel wire 17 around it. Have been. Therefore, when an external force in the length direction of the cable 16 acts on the cable holder externally fitted to the cable 16, the distal end 6 a of the first fixing tongue 6 or the distal end 7 a of the second fixing tongue 7 and the cable Due to the biting action of the steel wire 17 around the cable 16, the movement of the cable holder with respect to the cable 16 is completely prevented in any of the front and rear directions in the cable length direction.

On the other hand, the diameter D (see FIG. 3) of an imaginary circle passing through the distal ends of the locking extension pieces 2a to 2c of the cable holder fixed to the cable 16 as described above is determined by the cable insertion hole 14 Is configured to be sufficiently larger than the inner diameter d (see FIG. 4). Therefore, when inserting the cable 16 in which the cable holder is mounted at the predetermined position as described above into the cable insertion hole 14 provided with cement grout,
Each of the locking extension pieces 2a to 2c of the cable holder is bent inward against the elasticity and enters the cable insertion hole 14, but as described above, the cable 16 is used for fixing the cable 16 to the steel wire 17. Due to the biting effect of the tip 7 a of the tongue 7, the cable 16 slides against the cable holder due to frictional resistance when the cable holder 1 enters the cable insertion hole 14, and the cable holder is inserted into the cable insertion hole 14. There is no fear that it will remain.

Further, the cable 1 together with the cable holder is provided.
When the cable holder 6 is inserted to a predetermined position in the cable insertion hole 14 in which the cement grout is applied, the cable holder moves in the cable pulling direction (the direction of the arrow Y).
The tip of each extension piece 2a to 2c is a cable insertion hole 14
It is completely prevented by digging into the inner wall surface 14a. On the other hand, the movement of the cable 16 in the pull-out direction (the direction of the arrow Y) with respect to the cable holder is completely prevented by the tip 7a of the fixing tongue 7 biting into the steel wire 17 of the cable 16. Therefore, even if an external force or gravity acts on the cable 16 in the pulling-out direction (arrow Y direction),
The cable 16 does not fall out of the cable insertion hole 14.

[0014]

As described above, the holding device for a vaulting cable according to the present invention can be obtained by simply pressing the opening parallel to the axial direction of the main body of the body against the vaulting cable from the side. The cable can be easily fitted to an arbitrary position on the cable, and the cable holding tool fitted to the cable is attached to the cable surface of the tip of the first fixing tongue and the tip of the second fixing tongue. By the biting action, the cable can be firmly fixed in a state in which it does not easily slide in any of the front and rear directions in the axial direction.

Therefore, the cable for bolting, in which the cable holder of the present invention is externally fitted and fixed at an appropriate position, is connected to the excavation hole (the cable insertion hole of the above embodiment) provided with cement grout. By simply inserting the extension piece in the direction in which the extension piece extends rearward with respect to the insertion direction, it is possible to prevent the inserted cable from dropping unexpectedly due to gravity, vibration, or the like before the cement grout hardens. Can be reliably prevented by the biting effect between the tip of the locking extension piece and the inner wall surface of the excavation hole.

In other words, the use of the cable holder of the present invention eliminates the need for processing and forming a retaining portion such as a bent portion on the cable itself as in the prior art, and greatly reduces the labor and cost involved in retaining the cable. Can be achieved. Moreover, the cable holder of the present invention also has an effect of holding the cable at the center of the excavation hole, and can increase the bonding strength between the cable and the bedrock layer by cement grout.

According to the second aspect of the present invention, the first and second fixing tongue pieces having different directions can be formed by one cut, and the cost of the cable holder itself can be reduced. Can be planned.

Further, according to the structure of the third aspect,
When the cable holder of the present invention is used for a general bolting cable in which surrounding steel wires are arranged at intervals of 60 degrees, regardless of the circumferential phase when the cable holder is externally fitted to the cable, At least one of the pair of tongue pieces can be reliably cut into the steel wire surface around the cable, thereby improving safety.

[Brief description of the drawings]

1A is a front view of a cable holder, FIG. 1B is a left side view of the same, and FIG. 1C is an enlarged cross-sectional plan view of a main part showing a fixing tongue.

FIG. 2 is a bottom view of the cable holder.

FIG. 3 is a side view of the cable holder in a state where the cable holder is externally fitted to the cable.

FIG. 4 is a side view showing a state in which the cable is inserted into a cable insertion hole (filled cement mortar is not shown).

FIG. 5 is a front view of FIG. 4;

FIGS. 6A and 6B are schematic views illustrating a cable bolting method. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2a Locking extension piece 2b Locking extension piece 2c Locking extension piece 3 Opening parallel to the axial direction 4a Fitting guide piece 4b Fitting guide piece 5 Peripheral wall of main body 6th One fixing tongue piece 7 Second fixing tongue piece 9 Approximately D-shaped cut 11a Tongue pair 11b Tongue pair 13 Rock layer 14 Cable insertion hole 15 Cement mortar 16 Cable for bolting 17 Steel wire

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tokuo Yoneya 3-4-27 Imazukita, Tsurumi-ku, Osaka-shi, Osaka Kunimoto Shokai Co., Ltd. (72) Inventor Toru Tanaka 2-3-3 Nihonbashi Muromachi, Chuo-ku, Tokyo No. 14 Tokyo Seisakusho Co., Ltd. (56) References JP 6-7120 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 20/00

Claims (3)

(57) [Claims] 1. A retainer for attaching a plurality of steel wires to a cable for bolting, which is bundled and twisted, comprising: a main body formed by bending a steel plate into a C-shaped cross section; A plurality of locking extension pieces; a fitting guide piece integrally connected to the main body in an open manner from both sides of an opening parallel to the axial direction of the main body; A first fixing tongue piece formed by cutting the peripheral wall of the main body so as to project obliquely into the main body toward one side in the center direction, and the inside of the main body with the tip facing the other side in the axial direction. A second fixing tongue formed by cutting the peripheral wall of the main body so as to protrude obliquely, and the extending piece for locking is radially opened outward from one peripheral edge in the axial direction of the main body. A bolting cable holder that is integrally connected. 2. The fixing device according to claim 1, wherein the first and second fixing tongues are formed by a single substantially D-shaped notch so that the first and second fixing tongues are arranged in series in the axial direction of the main body and their ends are opposed to each other. The holder for a bolting cable according to claim 1. 3. A pair of the first and second in-line fixing tongues are bilaterally symmetric with respect to an imaginary plane passing through the axis of the main body and passing through the center of the opening parallel to the axial direction. 3. The holder for a bolting cable according to claim 2, wherein a center angle between the pair and a side opposite to the side having the opening is approximately 220 degrees. 4.