JPH0925797A - Nuts for tunnel rock bolts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To couple half-nuts even when a lock bolt is deformed by closing and connecting the half-nuts for the lock bolt of a tunnel with a connecting member. SOLUTION: This nut 1 is of a half-nut type, preferably a half-nut type hinge-coupled by a pin 2 on one end side, half-nuts 1a, 1b are closed at the free end on the other end side, and they are connected by a connecting member such as a connecting pin 3. The same connecting system as that at the free end, not hinge connection, may be used at the end opposite to the free end as required. The connecting pin 3 is driven into pin holes 30, 30 bored at the connected ends of the half-nuts 1a, 1b. The nut 1 constituted of the half-nuts 1a, 1b is coupled from the peripheral face side of a full screw type lock bolt 4 provided on the natural ground of a tunnel while the connected ends of the half-nuts 1a, 1b are not connected, the connected ends of the coupled nut 1 are closed, and they are connected and meshed by the connecting pin 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut for use in a full screw type lock bolt of a tunnel, that is, a lock bolt having a thread formed over its entire length.

The rock bolt of a tunnel is for preventing the loosening of the natural ground from occurring and progressing. A bearing plate is fitted to the rock bolt that has been placed, and this is fastened to the excavated surface of the natural rock by a nut.

The full screw type lock bolt is widely used for system lock bolting.

In constructing a full screw type lock bolt,
After placing rock bolts on the ground, it is often necessary to cut the ground to the required location. This is the case, for example, when setting up an emergency parking zone in a tunnel on a motorway.

When the ground is cut and expanded, the cut and expansion of the rock bolt may cause deformation such as bending of the portion of the lock bolt protruding into the mine.

[0006]

2. Description of the Related Art Conventionally, when an already mounted full-screw type lock bolt is bent or deformed in the ground that has been cut out, even if the nut applied to it is reused for tightening the bearing plate, it will lock. This is almost impossible due to the crushing of the thread on the bolt.

The nut can be applied by cutting the deformed lock bolt from an appropriate place. However, this lacks immediacy in tightening the bearing plate with the nut, and is not preferable in terms of preventing loosening of the ground.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that the rock bolt protruding into the mine is deformed such as bent.
It is an object to provide a nut which can be fitted to this without cutting and thus guarantees the immediacy of the bearing plate tightening during the above-mentioned ground dicing.

If it is not necessary to cut out the lock bolt, it can be used as a member for connecting the reinforcing bars of the concrete lining of the tunnel.

[0010]

SUMMARY OF THE INVENTION A feature of the present invention is that in a nut for a full thread type lock bolt of a tunnel, the nut has a half-nut shape and the half-nuts are mutually closed by a connecting member. The point is that they are designed to be combined. Preferably, the type of the half nut is a type in which one end side is hinged and the free end side is closed to be connected by a connecting member such as a connecting pin. This type of nut is
The required mounting can be performed with the same ease as an openable / closable clamp in which two half rings are pivotally attached to each other at one end side.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described with reference to the drawings showing an embodiment example of the present invention.

The nut 1 is a half-divided nut type, preferably a half-divided nut type in which one end side is a hinged type of a coupling type by a pin 2, and the other end side, the free end, is a half-divided nut 1a, 1b. Are closed and connected by a connecting member such as the connecting pin 3. The illustrated nut is of this preferred half-nut type.

Half nuts 1a and 1b in the nut 1
If desired, the end opposite to the free end may not be hinged and may have the same connection form as the free end.

The coupling pin 3 can be filled with a taper pin as shown in FIG. 4A or a tubular spring pin with a split groove 31 on the pipe wall as shown in FIG. 4B.
These pins 3 are driven into pin holes 30 and 30 formed in the coupled ends of the half nuts 1a and 1b.

In the present invention, the half nuts 1a, 1
The nut 1 made of these half-divided nuts can be fitted from the peripheral surface side of the bolt 4 to the full-screw type lock bolt 4 driven in the ground of the tunnel in a state where the joined ends of b are not joined. In the fitted nut, the coupled ends of the halved nuts 1a and 1b are closed, and they are coupled by a coupling member such as a coupling pin 3 to obtain a mesh with the bolt.

That is, according to the present invention, the nut can be fitted to the bolt peripheral surface rather than the bolt end.
Therefore, even if the rock bolt applied to the natural ground is bent or otherwise deformed, the nut can be attached thereto, and the above-described intended problem can be achieved.

When the rolling screw is used as the full screw type lock bolt, the half pitch nut is easily engaged with the lock bolt because the screw pitch is coarse.

[0018]

As described above, according to the present invention, even if the rock bolt protruding into the mine is deformed such as bent, the nut can be fitted to the rock bolt without cutting it. Therefore, when the ground is cut and expanded. It is possible to guarantee the immediacy of tightening the bearing plate.

Further, according to the present invention, since it is not necessary to cut the lock bolt in order to fit the nut to the placed rock bolt, the rebar connecting member of the concrete lining is not driven into the ground, and the existing lock The bolt can be used as a reinforcing bar binding member for concrete lining.

[Brief description of drawings]

FIG. 1 is an elevational view showing an example of a nut according to the present invention.

FIG. 2 is a plan view of the nut shown in FIG.

FIG. 3 shows a plan view of the nut of FIG. 1 in an unclosed state.

FIG. 4 (A) is a perspective view showing an example of a connecting pin as a connecting member according to the present invention, and FIG. 4 (B) is a perspective view showing another example of a connecting pin as the connecting member.

[Explanation of symbols]

 1 Nut 1a, 1b Half nut 2 Connecting pin 3 Connecting pin 30 Pin hole 4 Lock bolt

Claims (2)

[Claims] 1. A nut for a full-screw type lock bolt of a tunnel, which is in the form of a half-nut, the half-nuts closing each other and being connected by a connecting member. A nut for a rock bolt of a tunnel. 2. A nut for a full-screw type lock bolt of a tunnel, which is a half nut type having one end side hingedly joined, the free end side of which is closed and joined by a connecting member. A nut for a rock bolt of a tunnel, which is characterized in that