JPH0242204A - Special fastener - Google Patents

Abstract

PURPOSE:To enhance the workability in using a fastener in order to attach a machine part to a foamed concrete wall member by arranging expansion rings adapted to absorb water so as to expand, at the lower surface of a shank head and at a fastening surface of a nut. CONSTITUTION:A fastener adapted to apply to a foamed concrete wall is composed of a bolt-like fastening shank 1 and a nut 2. Expansion rings 3, 3a adapted to absorb water so as to expand are arranged at the lower surface of a shank head 13 of the fastening shank 1 and at a fastening surface of the nut 2. When the fastener is wetted by rain water or the like, the rings 3, 3a absorb this water so as to prevent rain water from entering into a gap between the fastening shaft 1 and a shaft hole. When a member should be removed from the foamed concrete wall 4, a tool such as a spanner or the like, is engaged with the shank head 13, and is rotated. Accordingly, the a coupling screw shaft 14 is rotated about its axis, relative to a shank part 10 so that the head 13 is removed, thereby it is possible to remove the member 5 or to replace the same with another one.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a special fastener for application to foam concrete walls called A-L-C.

<Prior Art> Conventionally, when attaching building members, machine parts, etc. to foam concrete walls, special nails or anchors exclusively for ALC are used.

<Problems to be solved by the invention> However, special nails, anchors, etc. for A-L-C have a limited pull-out strength, and therefore, when installing heavy objects or members that generate vibrations, foamed concrete is usually used. A stop hole is drilled in the wall, and the members are fixed to this hole using bolts and nuts.

In this case, there is a problem in that drilling the stopper hole and inserting the bolt into the stopper hole require time and effort. For this reason, there has recently been a strong demand in the building materials industry for a fastener that can be driven into foam concrete walls in the same way as regular nails, and that can be completely fixed in the same way as bolts and nuts. things don't exist.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel special fastener that satisfies the above-mentioned demands and has improved workability with an extremely simple structure.

<Means for Solving the Problems> In order to achieve the above object, the present invention is described in detail as a fastener for use in a foam concrete wall, which comprises a shaft head at one end of the shaft portion, It consists of a stop shaft with a thread groove and a driving guide on the other end, and a fixing nut with a thread groove that matches the thread groove formed on the inner surface of the hole, and on the lower surface of the shaft head and the tightening surface of the nut. It is equipped with an expansion ring that expands when it absorbs water.

<Function> According to the fastener with the above configuration, when the driving guide is applied to the foam concrete wall and the shaft head is struck with a hammer or the like, the stop shaft enters and penetrates the foam concrete wall by the driving guide. After that, by screwing a nut into the screw groove and tightening it, other members can be attached to the foam concrete wall in a completely fixed state, which achieves the objective of the invention.

<Example> The drawing shows a special fastener according to an embodiment of the invention.

This special fastener is applied to foam concrete walls, and consists of a bolt-shaped stop shaft 1 and a nut 2. The stop shaft 1 has a bottom surface of a shaft head 13, and the nut 2 has a tightening surface that expands due to water absorption. The expansion rings 3.3a are respectively provided.

The retaining shaft 1 has a synthetic resin shaft portion 10 having a thread groove 11 and a driving guide 12 on the shaft circumferential surface, and a combined threaded shaft 1 on the lower surface.
4, and a shaft head 13 made of rust-free metal having a shaft portion 1.
0, the coupling screw shaft 14 is integrated by insert molding.

A rotation stopper ridge 16 is formed on the end of the shaft portion 10 on the shaft head side, and prevents the stop shaft l from rotating together when the nut or the shaft head is rotated. The large diameter portion of the driving guide 12 is set to have a larger diameter than the shaft diameter of the thread groove portion, and protects the thread groove 11 during driving. A continuous thread is formed on the circumferential surface of this guide 12 as required. The shaft head 13 is formed into a bolt-like square or circular shape, with positive and negative 7u1 on the top surface.
5 is recessed.

The nut 2 has a thread groove 21 that fits the thread groove 11 formed on the inner surface of the hole, and a flange 22 that protrudes toward the outer periphery is integrally formed at the lower part.

However, in order to use the fastener of the present invention, the fixing hole 51 of the member 5 is inserted into the foam concrete wall 4, and the driving guide 12 is applied, and when the shaft head 13 is struck with a hammer, the stopper is inserted into the foam concrete wall 4. The axis l penetrates and penetrates the foamed concrete wall 4 by means of a driving guide 12 . After penetration, thread groove 1
By screwing and tightening nuts 2 to 1, the member 5 can be completely fixed to the foam concrete wall 4.

Note that, if necessary, the driving guide 12 may be cut near the thread groove 11.

When the above stopper gets wet with rainwater, etc., the ring 3.3a installed on the stopper shaft 1 and nut 2 absorbs this and expands, preventing rainwater from entering into the gap between the stopper shaft 1 and this shaft hole. do.

When it becomes necessary to remove the member 5 from the foamed concrete wall 4, when a tool such as a spanner or a screwdriver is engaged with the shaft head 13 and turned, the joint screw shaft 14 rotates relative to the shaft portion 10. This is removed so that the member 5 can be removed or replaced. When a new member is attached, the threaded shaft 14 of the previously removed shaft head 13 is screwed into the shaft portion 10 to fix it again.

<Effects of the Invention> As described above, the present invention includes a stop shaft having a shaft head at one end of the shaft portion, a thread groove and a driving guide at the other end, and a thread groove that fits the thread groove on the inner surface of the hole. The special fastener is composed of a fixed nut formed in the mold, and an expansion ring that expands due to water absorption is provided on the lower surface of the shaft head and the tightening surface of the nut. By driving the stop shaft through the wall and screwing the nut into the threaded groove protruding from the wall surface, the member can be completely fixed. Therefore, unlike the conventional mounting using bolts and nuts, there is no need for drilling pilot holes in the wall surface, positioning, etc., and the work can be further simplified, thereby achieving the object of the invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of a special fastener according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view. ■...Stopping shaft 10...Shaft portion 11...Thread groove 12...Guide 13...
Shaft head 2... Nut 21... Screw groove 3.3a... Expansion ring 4... Foamed concrete wall

Claims (4)

[Claims] (1) A fastener used for foam concrete walls, which includes a stop shaft having a shaft head at one end, a thread groove and a driving guide at the other end, and a screw that fits into the thread groove on the inner surface of the hole. A special fastener comprising a fixing nut with a groove formed therein, and an expansion ring that expands due to water absorption is provided on the lower surface of the shaft head and the tightening surface of the nut. (2) The stopper is composed of a synthetic resin shaft portion having a thread groove and a driving guide, and a rust-free metal shaft head having a coupling screw shaft insert-molded to the shaft portion on the lower surface. 2. The special fastener according to claim 1. (3) The special fastener according to claim 1, wherein the shaft head is formed into a hexagonal shaft, and a plus or minus groove is recessed in the top surface. (4) The special fastener according to claim 1, wherein a flange projecting to the outer periphery is integrally formed at the lower part of the nut.