JPH1136517A - Screw reinforcement joint device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce marking work for confirming the screwing depth to a joint of screw reinforcements. SOLUTION: This joint device is equipped with a joint 10 and jigs 20 for confirming the screw depth. The jigs 20 are equipped with a pair of splice sections 21 and positioning sections 22 built between one ens of them, and it is formed in a U-shape. The positioning sections 22 are brought into contact with the front end faces 1a of reinforcements 1, a pair of splice sections 21 are spliced to a pair of non-screw sections 1y of the reinforcements 1, and the jigs 20 are loaded to the screw reinforcements 1. The overall length Lo of each of the splice sections 21 is equivalent to the screwing depth for forbidding the screwing more than that. Specific length La from one end of each of the splice sections 21 is equivalent to the screwing depth necessay for the screw reinforcements. In a screwing state, the splice sections 21 of the jigs 20 can be seen, and when both ends 10a of the joint 10 are located in range of specific length Lb (Lb=Lo-La) from the other end of each of the splice sections 21, the necessary screwing depth is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a screw rebar which can confirm a screwing depth of a screw rebar to a joint.

[0002]

2. Description of the Related Art As shown in FIG. 7, a connecting device for a screw rebar uses a tubular joint 2 to connect a screw rebar 1. More specifically, first, as shown in FIG. 7A, the joint 2 is screwed to one of the threaded rebars 1 and the other threaded rebar 1 is brought into close proximity on the same straight line, and then, as shown in FIG. The joint 2 is turned so that about half of the joint is screwed to the threaded reinforcing bar 1 of the other party as shown in FIG. Next, to increase the connection strength, for example,
A grout material is injected from an injection hole 3 formed in the center of the joint 2. Then, the connection work of the screw reinforcing bar 1 is completed with the hardening of the grout material.

[0003] In order to obtain a sufficient connection strength between the screw rebars 1, it is necessary to set the screwing depth of each screw rebar 1 to the joint 2 to a predetermined amount or more. For this reason, conventionally, a marking 5 extending in the longitudinal direction with paint or the like is provided on the outer periphery of the screw reinforcing bar 1 at a position away from the distal end surface 1a. Distance D ₁ of the between one end (the end closer to the front end surface 1a of the screw rebar 1) and the front end surface 1a of the screw reinforcing bar 1 of the marking 5 is equivalent to the necessary screwing depth. Distance D ₂ between the other end and the distal end surface 1a of the screw rebar 1 marking 5 corresponds to the screwing depth prohibiting any further screwing. This distance D ₂ is intended to ensure the necessary screwing depth of the screw rebar 1 counterparty. Therefore, if the grout material is injected in a state where both ends of the joint 2 are located at positions corresponding to the markings 5 of the two screw reinforcing bars 1, that is, a state where a sufficient screwing depth is secured, a sufficient connection strength can be secured. Further, in the inspection of the connection state performed later, the screwing depth of the screw reinforcing bar 1 can be confirmed from the positional relationship between the marking 5 and both ends of the joint 2.

[0004]

As described above, conventionally, in order to confirm the screwing depth of the threaded rebar 1, the threaded rebar 1
The marking 5 is applied to the work, but the work of applying the marking 5 requires accurate application or spraying of the paint to a predetermined place using a jig or the like, and requires a lot of manpower. It was troublesome.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for connecting a pair of screw rebars having a pair of non-threaded portions which face in a radial direction and extend in an axial direction. Jig for confirming the screwing depth of the screw reinforcing bar, the jig has an attached portion that is attached along at least one non-threaded portion of the end of the screw reinforcing bar, When the threaded bar is screwed into the joint, the additional portion is disposed in a gap between the non-threaded portion of the threaded bar and the inner periphery of the joint.

According to a second aspect of the present invention, in the coupling device for a screw rebar according to the first aspect, the jig has a positioning portion extending from one end of the additional portion in a direction orthogonal to the additional portion, The positioning portion comes into contact with the end surface of the screw reinforcing bar. According to a third aspect of the present invention, in the connecting device for a screw rebar according to the second aspect, the jig is provided with a pair of the additional portions provided along a pair of the non-threaded portions of the screw rebar, and the positioning. And a U-shape having a portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a screw reinforcing bar 1 to be connected by a connecting device of the present invention will be described with reference to FIGS. On the outer peripheral surface of the screw reinforcing bar 1, a pair of male screw portions 1 x facing in the radial direction and a pair of flat non-thread portions 1 y arranged between the male screw portions 1 x and facing in the radial direction are formed. The non-threaded portion 1y extends linearly in the axial direction of the threaded reinforcing bar 1.

Next, a connecting device according to an embodiment of the present invention will be described with reference to FIGS. The coupling device has a joint 10 and a pair of jigs 20 for confirming a screwing depth of the screw reinforcing bar 1 to the joint 10. Fitting 1
Reference numeral 0 denotes a cylindrical shape, and has a female screw portion 11 for screwing the screw reinforcing bar 1 on the inner periphery. An injection hole 12 for a grout material is formed in the center of the joint 10 in the longitudinal direction.

The jig 20 is, as best shown in FIG.
It is formed in a U-shape from a thin metal or resin thin plate. More specifically, the jig 20 includes a pair of attachment portions 21 that are parallel to each other, and a positioning portion 2 that extends between one ends of the attachment portions 21 and is orthogonal to the attachment portion 21.
And 2. Preferably, the jig 20 is colored so that it can be clearly distinguished from the screw rebar 1.

In the above configuration, as shown in FIGS. 1 and 2, a jig 20 is previously attached to an end of each screw reinforcing bar 1. More specifically, a positioning portion 22 of the jig 20 is connected to the screw reinforcing bar 1. And a pair of attached portions 21
Is attached to the pair of non-threaded portions 1y of the screw reinforcing bar 1 with an adhesive. Thus, the positioning part 21 plays a role of positioning the jig 20.

Next, while the joint 10 is screwed to one of the right-hand threaded reinforcing bars 1 over the entire length, the other (left-handed) threaded reinforcing bar 1 is arranged on the same straight line, and the distal end surface of the threaded reinforcing bar 1 is arranged. 1a are brought close to each other. Next, joint 1
Turn 0 to move to the left. Then, the joint 10 is screwed to the end of the left threaded reinforcing bar 1. In this manner, the screwing operation is completed by screwing the ends of the pair of threaded rebars 1 to approximately half of the joint 10.

In the screwed state, the additional portion 21 of the jig 20 is, as shown in FIG.
And the inner peripheral surface of the joint 10 (the top surface of the thread of the female screw portion 11) is arranged in the gap 30 and does not hinder the screwing.

The screwing depth of the screw reinforcing bar 1 can be confirmed by the attachment 21 of the jig 20. That is, as shown in FIG. 1 and FIG.
o corresponds to a screwing depth that prohibits further screwing. This is for securing the necessary screwing depth of the screw reinforcing bar 1 of the other party. Also, one end of the attachment portion 21 of the jig 20 (the positioning portion 2)
A predetermined length La from the end on the second side) corresponds to a required screw length of the screw reinforcing bar 1. Therefore, in the screwed state of the screw reinforcing bar 1, the additional portion 21 of the jig 20 can be seen, and the end 10 a of the joint 10 is separated from the other end of the additional portion 21 of the jig 20 by a predetermined length Lb (Lb = Lo). If it is located in the range of -La), it means that the required screwing length is secured.

After the screwing of the threaded reinforcing bar 1 is completed and the screwing depth is confirmed, a nozzle of an injector (not shown) is applied to the injection hole 12 to inject a grout material (not shown). As a result, the grout material passes through the injection hole 12 and fills the gap between the outer peripheral surface of the screw reinforcing bar 1 and the inner peripheral surface of the joint 10.
By the hardening of the grout material, the connection work of the pair of screw reinforcing bars 1 is completed. When inspecting the connection state at a later date, it is possible to clearly confirm that the required depth is secured by screwing the two threaded rebars 1 by looking at the attachment portion 21 of the jig 20.

In the above embodiment, only the portion from the other end of the additional portion 21 to the predetermined length Lb may be colored so that the required screwing depth can be more easily confirmed. The threaded reinforcing bar 1 may be screwed to the joint 10 as follows. That is, the joint 10 is screwed about one half to the one screw reinforcing bar 1. Next, the other threaded reinforcing bar 1 is arranged coaxially with the joint 10, and the threaded reinforcing bar 1 is turned to be screwed into the joint 10 by about half. Instead of injecting the grout material, a torque may be applied to the pair of threaded reinforcing bars 1 so that the end surfaces 1a thereof are strongly applied to each other. In this case, the jig 20 may be attached to only one screw reinforcing bar 1. Since the tip surfaces 1a of both the screw reinforcing bars 1 are in contact with each other, if the screwing depth of one of the screw reinforcing bars 1 is confirmed with this jig 20, the other screw reinforcing bars 1
This is because the screwing depth will be checked.

Hereinafter, another embodiment of the present invention will be described.
In these embodiments, components corresponding to the first embodiment will be described with the same reference numerals. In the embodiment shown in FIG. 4, in a state where the screw reinforcing bar 1 is screwed to the joint 10,
Tightening the pair of lock nuts 40 at both ends of the joint 10 increases the connection strength. In this case, the additional portion 21 of the jig 20 is made longer than the first embodiment by the width of the lock nut 40, and the threaded reinforcing bar 1 is screwed to the joint 10 at a depth equal to or greater than the required screwing depth. In a state where the lock nut 40 is tightened.

In the embodiment shown in FIGS. 5 and 6, the non-threaded portion 1y of the threaded reinforcing bar 1 is not flat but concave and grooved. In this case, it is preferable to use a jig 50 made of a thin metal or resin rod having a circular cross section. As in the first embodiment, the positioning portion 52 of the jig 50 hits the distal end surface of the screw reinforcing bar 1, and the pair of attached portions 51 is attached to the pair of non-threaded portions 1y. In the screwed state of the threaded reinforcing bar 1 to the joint, the additional portion 51 is disposed in the gap 30 between the non-threaded portion 1y and the inner peripheral surface (shown by the imaginary line X) of the joint.

The present invention is not limited to the above-described embodiment, and can adopt various forms. In the case where a U-shaped jig is used and the step of screwing the jig to the joint over the entire length is not included in the screwing, it is not necessary to attach the jig to the screw reinforcing bar with an adhesive. In this case, as the screw rebar is screwed into the joint, the jig also advances with the screw rebar via the positioning portion abutting on the distal end surface of the screw rebar. Further, the jig positioning portion may not be provided. In this case, only the attached portion is attached to the non-threaded portion of the screw reinforcing bar with an adhesive or the like. In this case, similarly to the above embodiment, the additional portion may extend from the distal end surface of the screw rebar by a length Lo (see FIG. 1), or the additional portion having the length Lb may be extended from the distal end of the screw rebar. They may be mounted apart by a predetermined length La. The jig may be constituted by a colored adhesive tape.

[0019]

As described above, according to the first aspect of the present invention, it is possible to easily confirm from the outside whether or not the screw rebar is screwed to the required screwing depth by the jig provided on the screw rebar. And sufficient connection strength can be secured. In addition, it is not necessary to apply markings such as spraying paint on the screw rebar to check the screwing depth. According to the second aspect of the present invention, the positioning of the jig can be easily performed by applying the positioning portion to the distal end surface of the screw reinforcing bar. According to the third aspect of the present invention, the pair of attached portions is attached to the pair of non-threaded portions of the threaded rebar, so that there is almost no blind spot at the time of checking the screwing depth, and this checking operation can be easily performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connection device for a screw reinforcing bar according to an embodiment of the present invention, showing a state where screwing of the screw reinforcing bar has been completed.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a jig used in the connection device.

FIG. 4 is a front view showing another embodiment of the present invention.

FIG. 5 is a perspective view of a jig showing another embodiment of the present invention.

FIG. 6 is a view of the screw reinforcing bar to which the jig of FIG.

FIGS. 7A and 7B are diagrams showing a conventional method of connecting threaded reinforcing bars in the order of steps.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 threaded reinforcing bar 1a distal end surface 1x male thread portion 1y non-threaded portion 10 joint 20,50 jig 21,51 attached portion 22,52 positioning portion

Claims (3)

[Claims] 1. An apparatus for connecting a pair of threaded reinforcing bars having a pair of non-threaded portions that face each other in a radial direction and extend in an axial direction, wherein a joint and a screwing depth of the threaded reinforcing thread to the joint are confirmed. And a jig for the jig, the jig has an attached portion that is attached along at least one non-threaded portion of the end of the screw rebar, and in a screwed state to the joint of the screw rebar, The connecting device for a screw reinforcing bar, wherein the additional portion is disposed in a gap between the non-threaded portion of the screw reinforcing bar and the inner periphery of the joint. 2. The jig has a positioning portion extending from one end of the additional portion in a direction orthogonal to the additional portion, and the positioning portion contacts an end surface of the screw reinforcing bar. Item 2. The connecting device for a screw reinforcing bar according to Item 1. 3. The jig has a U-shape including a pair of the additional portions provided along a pair of the non-threaded portions of the screw reinforcing bar and the positioning portion. The connecting device for a screw reinforcing bar according to claim 2.