JPS6215360Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses a resin capsule to be attached to the tip of a lock bolt when fixing the lock bolt in a hole drilled in the rock in order to strengthen the rock in tunnel construction for roads, railways, mines, etc. This metal fitting has a tip engaging part 2 for a lock bolt 1 at its upper end, a conical cylinder shape whose side part 3 widens from the upper end to the lower end, and a protrusion 4 directed outward at the lower end. This invention relates to a mounting bracket for lock bolts.

The conventional resin capsule 5 uses a glass tube, a porcelain tube, a baking tube, etc. as the inner tube 6, encloses a hardening agent 7 therein, and uses a synthetic resin bag as the outer tube 8, which is made of an outer tube 8 and an inner tube 6.
Generally, a thermosetting resin 9 such as an unsaturated polyester resin is filled in between. This resin capsule 5 is inserted into the hole 10, and then the outer cylinder 8 and the inner cylinder 6 are destroyed by the insertion of the rotating lock bolt 1, and the respective contents, the fixing agent base 9 and the hardening agent 7, are mixed. Hardening progresses rapidly and the inserted lock bolt 1 is firmly fixed to the rock 11. However, the locking bolt 1 rotating in the hole 10 destroys the inner cylinder 6, and the curing agent 7 therein is mixed with the base adhesive 9, such as unsaturated polyester, housed in the outer cylinder 8, and is rapidly cured. In order to do this, the condition of hole diameter of hole 10 < lock bolt diameter + inner cylinder diameter must always be satisfied. Bedrock 1
If the above-mentioned hole diameter becomes large due to cracks, etc., or the above-mentioned conditions are not sufficiently satisfied, the inner cylinder 6 may not be sufficiently destroyed, resulting in failure. Rock bolt 1 and bedrock 1 when using the same resin capsule 5
The adhesive strength of No. 1 depends in part on how the main adhesive agent 9 and the curing agent 7 are mixed.

In view of the above, in the present invention, when inserting the rotating lock bolt 1 into the hole 10, a spring 12 made of a spiral steel wire with the end opposite to the direction of movement of the lock bolt 1 is bent at the tip thereof, and the inner cylinder 6 is The object of the present invention is to provide a lock bolt mounting fitting that improves the mixing effect as well as the breaking effect. The mounting fitting may be a conical plate 14, which is a conical steel plate whose bottom end is bent.

Conventionally, materials that are easily broken such as glass tubes, porcelain, and bake tubes have been used as the inner cylinder 6, and an inner cylinder made of a thin synthetic resin film has been considered inappropriate, but the present invention is configured as described above, so that the tip wedge portion 13 of the lock bolt 1 is inserted from the lower end opening of the metal fitting toward the upper end, and with the wedge portion 13 engaged with the tip engaging portion 2, the hole 10 is
When the bolt 1 is inserted into the hole and the bolt 1 is rotated around its center line, the metal fitting also rotates in the direction of the arrow a in FIG. The inner and outer cylinders 6, 8 of the resin capsule 5 can be reliably destroyed by the projections 4. The base material 9 and the curing agent 7 in the inner and outer cylinders 6, 8 can be sufficiently stirred and mixed by the rotation of the projections 4 and the side parts 3, thereby improving the adhesive strength between the rock bolt 1 and the rock 11. It is.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the state of use of the lock bolt mounting fitting of the present invention, Fig. 2 is a front view of the above-mentioned fitting with a spiral spring, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a view of the above-mentioned fitting with a conical plate. FIG. 5 is a plan view of FIG. 4. DESCRIPTION OF SYMBOLS 1... Lock bolt, 2... Tip engaging part, 3... Side part, 4... Protrusion, 12... Spiral spring, 14... Conical plate.

Claims (1)

[Claims for Utility Model Registration] (1) A tip engaging portion 2 of the locking bolt 1 is formed at the upper end, the side portion 3 is shaped like a conical cylinder and expands from the upper end to the lower end, and the lower end thereof is a protrusion facing outward. Mounting bracket for lock bolt with 4. (2) The mounting bracket for a lock bolt according to claim 1, wherein the side portion 3 is formed by a spiral spring 12. (3) The mounting bracket for a lock bolt according to claim 1, wherein the side portion 3 is formed by a conical plate 14.