JPH0246972Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an embedded nut used for screwing scaffolding bolts onto concrete utility poles.

[Prior Art] This type of embedded nut has been known in the past, and when manufacturing utility poles, these embedded nuts are positioned at predetermined positions on the inner wall of the formwork, and bolts are screwed and fixed from the outer wall of the formwork. , the ready-mixed concrete is poured into the formwork and formed, but when compacting using centrifugal force, the ready-mixed concrete enters the screw hole of the embedded nut through the gap created by the loosening of the bolt. It was made difficult to screw in scaffolding bolts after the pillars were erected.

Therefore, as seen in Utility Model Publication No. 49-37640, the applicant put a packing on the end face of the embedded nut and fixed it by tightening it with a jig through this packing, so that it could fit into the screw hole of the embedded nut. A seal was devised to prevent fresh concrete from penetrating.

[Problems to be solved by the invention] The invention solves the troublesome work caused by using a bag as in the above-mentioned Japanese Utility Model Publication No. 49-37640,
The aim is to relieve the economic burden.

[Structure of the invention] A flange portion is provided on the open end side of a bottomed cylindrical body with a screw hole for screwing a scaffolding bolt on the inside, and the end surface of the flange portion is formed into a tapered surface that is lowered on the screw hole side. It is constructed by integral molding of synthetic resin material.

[Function] The embedded nut placed on the inner wall of the formwork is crimped against the bolt by the play of the tapered surface provided on the end face of the flange when the bolt screwed into the outer wall of the formwork is tightened, and it is not loosened by centrifugal force. Therefore, it is possible to prevent fresh concrete from entering the inner screw hole.

[Example] In the figure, 1 is a bottomed cylindrical body provided with a screw hole 2 on the inside into which a scaffolding bolt is screwed, and the bottomed cylindrical body 1
A flange portion 3 is provided on the open end side of the flange portion 3, and the flange portion 3 is integrally molded from a synthetic resin material.

The end surface of the flange portion 3 is formed into a tapered surface 4 that is lowered on the side of the screw hole 2, as shown in FIG. The outer surface of the bottomed cylindrical body 1 has a hexagonal cross section, and a plurality of ribs 5 are arranged around the ribs 5 to enhance entanglement with the concrete.

Next, the use of the embedded nut A of the present invention constructed in this way will be explained. In FIG. 4, reference numeral 6 denotes a formwork for forming a utility pole, and a circular hole 7 having the same diameter as the outer diameter of the flange portion 3 of the embedded nut A is opened at a predetermined location. 8 is a jig provided with a circular hole 9 having the same diameter as the circular hole 7, and the jig 8 is provided on the outer wall of the formwork 6 so that the circular hole 9 communicates with the circular hole 7 formed in the formwork 6. Fixed by welding, etc. A screw hole 10 having a larger diameter than the circular hole 9 is formed on the outside of the circular hole 9 of the jig 8.

Reference numeral 11 denotes a bolt for temporarily fixing the embedded nut A, and a cylindrical portion 13 that fits into the circular holes 7 and 9 is provided at the lower part of the planar hexagonal head 12, and the upper half of the cylindrical portion 13 is provided. A threaded groove 14 is formed in the portion to be screwed into a threaded hole 10 provided in the jig 8. The position of the lower end of the threaded groove 14 is adjusted so that when the threaded groove 14 is screwed into the threaded hole 10, the lower end of the cylindrical part 13 slightly protrudes from the inner wall surface of the formwork 6, as shown in FIG. It is formed by

Then, attach the bolt 11 to the formwork 6 via the jig 8, screw the screw hole 2 into the shaft portion 15 of the bolt 11 protruding into the formwork 6, attach the embedded nut A, and tighten. For example, in the embedded nut A, the end surface of the flange portion 3 is pressed against the lower end surface of the cylindrical portion 13 of the bolt 11 due to the play of the tapered surface 4 and the flexibility of the synthetic resin material.

Therefore, even if fresh concrete is poured into the formwork 6 and compacted using centrifugal force, the embedded nuts A and the bolts 11 will not loosen, and the fresh concrete will not be inserted into the screw holes 2 of the embedded nuts A. will not be allowed to invade.

[Effects of the invention] As described above, the nut for embedding in concrete utility poles of the present invention is crimped onto the bolt by the tapered surface provided on the end face of the flange, and there is no loosening, and it is easy to insert fresh concrete into the screw hole. It is possible to prevent intrusion, and since there is no need to tighten through the packing, it is easy to attach to the formwork, and furthermore, the economic burden that is seen when using the packing can be eliminated. There are many advantages as mentioned above.

[Brief explanation of the drawing]

The figures relate to an embodiment of the present invention, and Fig. 1 is an external perspective view, Fig. 2 is a partially enlarged cross-sectional view, Fig. 3 is a plan view showing the state attached to the formwork, and Fig. 4 is the same as above. FIG. 1... Bottomed cylindrical body, 2... Screw hole, 3... Flange portion, 4... Tapered surface, A... Embedded nut.

Claims (1)

[Scope of utility model registration request] A flange portion is provided on the open end side of a bottomed cylinder with a screw hole for screwing a scaffolding bolt on the inside, and the end surface of the flange portion is formed into a tapered surface that is lowered on the screw hole side, and is made of synthetic resin material. An integrally molded nut for embedding in concrete utility poles.