JPH0745775B2 - Method of joining screw bar rebar - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for joining screw bar rebars used as large-diameter rebars in rebar construction in accordance with the increase in size and height of civil engineering and building structures.

[Conventional technology]

As shown in FIGS. 11 and 12, lock nuts 3a and 3b and a hexagon screw coupler 2 are used as a method for joining the screw bar reinforcing bars.
There is a lock nut joint construction method using.

This joining step will be described with reference to FIGS. 7 to 10. First, the screw-bar rebars 1 and 4 to be joined first are marked with a joint inspection mark 5 (FIG. 7), and the screw-bar rebar 1 is locked with a lock nut. Insert 3a and hex screw coupler 2. In this case, the tip of the screw bar rebar 1 is projected from the coupler 2. On the other hand, the lock nut 3b
To the position of marking 5.

Then, the screw pitch rebar 1 and the screw bar rebar 4 are adjusted in screw pitch. This screw pitch adjustment work is performed by the operator's visual observation and intuition while moving the end of the screw bar rebar 4 closer to or away from the end of the screw bar rebar 1 or rotating any of the screw bar rebars 1 and 4. . When the screw pitch rebar 4 of the screw rebar 1 has a screw pitch, the hexagon screw coupler 2 is inserted to a predetermined position of the screw rebar 4, and then the lock nuts 3a and 3b are reset to the predetermined positions (Fig. 9).

Tighten each of the reset lock nuts 3a and 3b by hand with a spanner. Although illustration is omitted,
Finally, the tightening work is performed with a predetermined tightening force using the lock nut joining main shrinking machine (tightening machine).

[Problems to be solved by the invention]

In the joining step, the work of adjusting the screw pitch at the time of abutting the screw bar rebars 1 and 4 is important. This is because, when inserting the hexagon screw coupler 2 into the screw bush rebar 4, if the screw pitch between the screw bush rebar 1 and the screw bush rebar 4 does not match, the hexagon screw coupler 2 cannot be inserted into the screw bush rebar 4 naturally. In this case, return the hexagon screw coupler 2 to the screw bar rebar 1 side again,
Again, the screw pitch rebar 1 and the screw bar rebar 4 are adjusted in screw pitch, and when the screw pitches match, the hexagon screw coupler 2 is again inserted into the screw bar rebar 4.

However, as described above, the screw pitch adjustment is largely due to the operator's visual observation, intuition, etc., and there is no big problem if the operator is accustomed to some extent, but it is necessary to rush the joining process or the construction process for the first time. In such a case, the work of adjusting the screw pitch by the worker is not necessarily better. In particular, in the case of this type of mechanical joining, the construction speed greatly varies depending on whether the screw pitch matching (fitting) work is performed smoothly.

The object of the present invention is to eliminate the inconvenience of the conventional example, and the screw pitch matching work of the screw bar reinforcement which is a special large-diameter reinforcing bar, by using a member having a simple structure, anyone including a beginner can easily and quickly. It is intended to provide a method of joining screw bar rebars which can improve workability as a result.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention abuts one threaded bar reinforcing bar end to which a lock nut and a screw coupler are previously mounted and the other threaded bar reinforcing bar end to which a lock nut is mounted, and straddles the screw collar between both bar ends. In the method of joining the screw bar rebars that are tightened with lock nuts on both sides, the abutment of the screw bar rebar ends is such that the outer diameter of the screw bar rebars contacts the longitudinal surface of the oblong body less than half of its circumference. Form a thread surface of the same pitch as the outer peripheral thread of the screw bar rebar by the screw thread and screw groove in the arc-shaped recess, and use a half-length nut body with a handle attached to the side opposite to the arc-shaped recess of the oblong body, The gist of the invention is to bring the half-length nuts into contact with each other so as to straddle the ends of both reinforcing bars while adjusting the pitch of the screws.

[Action]

According to the present invention, with the increase in the size and height of civil engineering and building structures, when joining a screw bar rebar used as a special large-diameter rebar in a rebar construction, a half between the abutted screw bar rebar ends is joined. Just abut the split length nut body,
The recessed screw surface of the long nut body acts as a gauge, and the screw pitches of the two reinforcing bar reinforcing bars are fitted to each other, which means that the reinforcing bar mutual thread pitches have been adjusted. Further, such abutment of the half-divided nut body can be easily performed while visually observing from the outside.

In addition, the half-length nut body has a size such that the arcuate concave portion contacts with the outer diameter of the screw bush rebar less than half the circumference, so if the diameter of the screw bush rebar is small and the screw pitch is suitable, divert it to this. You can also

Further, since the handle is attached to the half-divided long nut body on the side opposite to the arcuate recess, the arcuate recess can be easily separated from the threaded bar rebar by contacting only part of the outer periphery of the threaded bar rebar. Therefore, this half-divided nut body can be easily brought into contact with the screw bar rebar, and even when it is separated from the screw bar rebar, the half-length nut body is securely attached and removed without sliding and dropping the hand. At the same time, handling can be facilitated and work efficiency can be improved.

Since the half-length nut body has a certain length, if the shaft ends of both abutted rebar ends are misaligned, make sure that the half-length nut body straddles the outer periphery of both abutted rebar ends. When they come into contact with each other, a gap is formed between the half-divided nut body and one of the two reinforcing bars, so that the misalignment of the shaft center can be found quickly. The axial misalignment of the two reinforcing bars is hard to be visually detected, and if this is not detected, the Supplers cannot be fitted after all.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the half length nut body 6 as a pitch adjusting jig used in the method of the present invention will be described.

As shown in FIGS. 4 to 6, an arc-shaped recess 8 is formed on the longitudinal surface of the laterally elongated body 7, the arc-shaped recess 8 having the outer diameter of the screw bar rebar 1, 4 abutting less than half the circumference thereof. 8 has a screw surface 9 formed by a screw thread 9a and a screw groove 9b,
The screw pitch of the screw surface 9 is the same as the outer peripheral screw of the screw bar rebars 1 and 4 described later, and the number of pitches is 3 to
It may be about 4 pitches.

Further, a lateral U-shaped handle 10 is attached to the side of the laterally elongated body 7 opposite to the arcuate concave portion 8.

In order to manufacture such a half-length nut body 6, a hexagon screw coupler or a lock nut which is a joining member of a lock nut joint can be used. For example, as shown in FIG. Attach handle 10 to.

Next, the joining method of the present invention performed using such a half-length nut body 6 will be described. Since the steps other than the screw pitch adjustment are the same as those shown in FIGS. 7 to 10, detailed description thereof will be omitted.

1 to 3 show each step of the method of the present invention. As shown in FIG. 1, a screw bush rebar 1 and a screw bush rebar in which a hexagon screw coupler 2 and a lock nut 3a or a lock nut 3b are already inserted. In order to adjust the screw pitch of No. 4, pull the two reinforcing bars together while abutting them.

Then, the grip 10 is used to bring the half-length nut body 6 into contact with the outer peripheral surface of the two screw bush rebars 1 and 4, centering on the ends thereof.
The screw surface 9 of the arcuate recess 8 of the half-length nut body 6 is rebar
By hitting the outer peripheral threads 1 and 4, it is possible to see at a glance whether the thread pitch is correct.

That is, the thread of the screw surface 9 is such that the thread 9a and the thread groove 9b are continuous, and the thread 9a should be aligned with the thread grooves of the reinforcing bars 1 and 4, and the thread groove 9b should be aligned with the thread of the reinforcing bars 1 and 4. For example, the rebar 1,4
The screw pitch of is continuous. If the screw pitches do not match, check the screw pitch alignment by rotating or pushing / pulling the screw Fuji rebar of the one (the reinforcing bar 4 in FIG. 1) that does not match the screw pitch.

After this, the hexagon screw coupler 2 is inserted into the screw bar rebar 4. This completes the screw pitch alignment (fitting) of the screw bar rebars 1 and 4 as shown in FIG.

〔The invention's effect〕

As described above, the method for joining the screw bar reinforcement of the present invention is
Since it is possible to easily adjust the screw pitch between the screw bar rebars, no skilled worker is required. In addition, the speed of screw pitch alignment can be improved, which makes it possible to improve the efficiency of the work of joining the screw bar reinforcements and thus shorten the process.

By the way, in the test example, welding time per set, welding performance per day Conventional method 4 minutes / 2 90Set / 2 people Invention method 2.5 minutes / 2 40Set / 2 people * Working time per day 6 hours (360 minutes) * Reinforcing bar diameter D51 The work efficiency has improved by about 35%.

Moreover, since the handle is attached to the half-length nut body, the half-length long nut body can easily come into contact with the screw bush rebar, and even when it is separated from the screw bush rebar, the hand does not slip and fall. It is possible to secure the attachment / detachment work of the half-divided nut body, facilitate the handling, and further improve the work efficiency.

In this way, it is possible to carry out without increasing the cost because it does not use expensive and special members and only uses members with a simple structure, and it can also be used to join screw bar rebars with the same screw pitch and small diameter. Therefore, it is highly economical.

[Brief description of drawings]

1 to 3 are side views showing respective steps of a method for joining threaded rod rebars of the present invention, FIG. 4 is a front view of a half-divided nut body used in the present invention, and FIG. 5 is a side view of the same. FIG. 6 is a plan view of the same as above, FIGS. 7 to 10 are side views showing each step of the lock joint construction method for screw bar reinforcement, FIG. 11 is a front view of the lock nut joint, and FIG. It is a front view. 1,4… Screw bar Reinforcing bar, 2… Hexagonal screw coupler 3a, 3b… Lock nut, 5… Joint inspection marking 6… Half length nut body, 7… Horizontal body 8… Arc concave, 9… Screw surface 9a… Screw Mountain, 9b… Screw groove 10… Handle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-27672 (JP, A) JP-A-61-277771 (JP, A) Japanese Patent Application No. 60-83438 (No. Of the specifications and drawings attached to the application of Microfilm (JP, U) Contents of the specifications and drawings attached to the application of Japanese Patent Application No. 58-124867 (Japanese Utility Model No. 60-33249) Micro film (JP, U)

Claims (1)

[Claims] 1. A screw nut rebar end to which a lock nut and a screw coupler are previously attached is abutted with another screw bar rebar end to which a lock nut is attached, and the screw coupler is moved so as to straddle both ends of the rebar. , In the method of joining screw bar rebars that are tightened with lock nuts on both sides, the butts of the screw bar rebar ends are screwed into an arcuate recess having a size that abuts the longitudinal surface of the oblong body with the outer diameter of the screw bar rebar less than its half circumference This half-divided nut body is formed by forming a thread surface having the same pitch as the outer peripheral thread of the screw bar reinforcement by the mountain and the thread groove, and using a half-divided nut body with a handle attached on the side opposite to the arcuate recess of the oblong body. A method for joining screw reed bars, wherein the step is performed while abutting the outer periphery of both rebars so as to match the pitches of the screws.