JPS6347472A - Method of joining screw knot reinforcement - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for joining threaded reinforcing bars used as large-diameter reinforcing bars in reinforcing steel work as civil engineering and building structures become larger and taller.

[Conventional technology]

As a method for joining such threaded reinforcing bars, Fig. 11, Fig. 1
As shown in Fig. 2, there is a lock nut joint method using lock nuts 3a, 3'b and a hexagonal screw coupler 2.

To explain this joining process based on FIGS. 7 to 1011iJ, first, the threaded reinforcement bars 1 and 4 to be joined are
A marking 5 for joint inspection is applied to the bolt (FIG. 7), and a lock nut 3a and a hexagonal screw coupler 2 are inserted into the threaded reinforcing bar 1. In this case, the tip of the threaded reinforcing bar 1 is made to protrude from the coupler 2.

On the other hand, insert the lock nut 3b into the threaded reinforcing bar 4 to the position of the marking 5.

Then, the threaded reinforcing bar 1 and the threaded reinforcing bar 4 are screwed together with a pinch. This screw pinching work is performed by the operator's visual observation and intuition by moving the end of the threaded reinforcing bar 4 closer to or away from the end of the threaded reinforcing bar 1, or by rotating either of the threaded reinforcing bars 1.4. . When the threaded reinforcing bar 1 and the threaded reinforcing bar 4 are pinched, the hexagonal screw coupler 2 is inserted into the threaded reinforcing bar 4 to a predetermined position, and then the lock nuts 3a and 3b are reset to their respective predetermined positions (FIG. 9).

Temporarily tighten the reset lock nuts 3a and 3b by hand using a wrench. Although not shown, the final tightening machine (tightening machine) for joining lock nuts is shown at the end.
Tightening work is performed sequentially using a predetermined tightening force.

[Problem that the invention seeks to solve]

In the joining process, the screw pinching operation when the threaded reinforcing bars 1 and 4 are butted together is important. This is because, when inserting the hexagonal screw coupler 2 into the threaded reinforcing bar 4, if the screw pitches of the threaded reinforcing bar 1 and the threaded reinforcing bar 4 do not match, of course the hexagonal screw coupler 2 cannot be inserted into the threaded reinforcing bar 4. In this case, return the hexagonal screw coupler 2 to the threaded reinforcing bar 1 side again, adjust the thread pitch of the threaded reinforcing bar 1 and threaded reinforcing bar 4 again, and once the thread pitches match, insert the hexagonal screw coupler 2 into the threaded reinforcing bar 4 again. Become.

However, as mentioned above, the screw pitch adjustment depends largely on the operator's visual inspection and intuition, and although there is no major problem once the operator is familiar with it to some extent, the construction process must be done in a particularly fast manner, such as when performing joining work for the first time. In such cases, it is not always possible to rely on the operator to match the screw pitch.Especially in the case of this type of mechanical joining, speed and speed depends on whether or not this screw pinching (fitting) work goes smoothly. There will be a big difference.

The purpose of the present invention is to provide a method for joining threaded reinforcing bars, which eliminates the disadvantages of the conventional example, allows anyone, including beginners, to easily and quickly perform the work of adjusting the thread pitch, and improves the workability of joining. be.

[Means for solving problems]

In order to achieve the above object, the present invention abuts one threaded reinforcing bar end to which a lock nut and screw coupler are attached in advance to the other threaded reinforcing bar end to which a lock nut is attached, and the threaded coupler is straddled between both ends of the reinforcing bar. move it like this,
In a method for joining threaded reinforcing bars in which both sides are tightened with lock nuts, the gist is that the ends of the threaded reinforcing bars are butted together by abutting a half-length nut body so as to straddle the outer periphery of both reinforcing bars and adjusting the pitch of the threads. It is something to do.

[Effect]

According to the present invention, by simply abutting the half-split nut between the butted ends of the threaded reinforcing bars, the threaded surface of the concave portion of the long nut acts as a gauge, and the threaded ends of the double threaded reinforcing bars fit into it. This means that the thread pitch between the reinforcing bars has been matched. The abutment of such a half-length nut body can be easily performed while visually observing from the outside.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the half-length NAND body 6 as a pinch jig used in the method of the present invention will be explained.

As shown in FIGS. 4 to 6, a recess 8 is formed in the longitudinal surface of the oblong body 7, and a threaded surface 9 formed by a thread 9a and a thread groove 9b is formed in the cough recess 8. The thread pitch of No. 9 is the same as the outer circumferential thread of threaded reinforcing bar 1.4, which will be described later, and the number of pitches may be about 3 to 4 pitches.

Further, a horizontal U-shaped handle 10 was attached to the side of the oblong body 7 opposite to the recess 8.

In addition, to manufacture such a half-split long nut body 6, a hexagonal screw coupler or a lock nut, which are joint members of a lock nut joint, can be used. For example, as shown in FIG. Install 10.

Next, a joining method of the present invention using such a half-length NAND body 6 will be explained. Note that the steps other than the thread pitch adjustment are the same as those shown in FIGS. 7 to 10, so detailed explanations will be omitted.

FIGS. 1 to 3 show each step of the method of the present invention, and as shown in FIG. In order to match the screw pitch, pull the ends of both reinforcing bars against each other.

Then, holding the handle 10, the half-length nut body 6 is brought into contact with the outer circumferential surface of the double-threaded reinforcing bars 1 and 4, centering on the ends thereof. By applying the threaded surface 9 of the recess 8 of this half-length nut body 6 to the outer circumferential threaded portion of the reinforcing bar 1.4, it can be seen at a glance whether the thread pitch is correct.

In other words, the thread on the threaded surface 9 has a continuous thread 9a and thread groove 9b, and the thread 9a should be aligned with the thread groove of the reinforcing bars 1 and 4, and the thread groove 9b should be aligned with the thread of the reinforcing bar 1°4. For example, the thread pitch of the reinforcing bars 1.4 is continuous. If the thread pitch does not match, rotate or push/pull the threaded reinforcing bar of the one whose thread pitch does not match (reinforcing bar 4 in Figure 1) to check the thread pitch alignment.

After doing this, the hexagonal screw coupler 2 is inserted into the screw reinforcing bar 4. This completes the thread pitch matching (fitting) of the threaded reinforcing bars 1 and 4 as shown in FIG.

〔Effect of the invention〕

As described above, the method for joining threaded reinforcing bars of the present invention is as follows:
Since the thread pitch between threaded reinforcing bars can be easily matched, skilled workers are not required. Moreover, the speed of screw pitch adjustment is improved, which makes it possible to improve the efficiency of the threaded reinforcing bar joining work and shorten the process.

By the way, in the test example, welding time per 15et, welding yield per day, conventional method.
4 minutes/2 90 sets/2 people Method of the present invention 2.
5 minutes/2 40 sets/2 people* Working time per day
6:00 (360 minutes)* The reinforcing bar diameter was D51, which increased work efficiency by approximately 35%.

[Brief explanation of drawings]

FIGS. 1 to 3 are side views showing each step of the threaded reinforcing bar joining method of the present invention, FIG. 4 is a front view of a half-split nut body used in the present invention, and FIG. 5 is a side view of the same. Figure 6 is a plan view of the same as above, Figures 7 to 10 are side views showing each step of the lock joint construction method for threaded reinforcing bars, Figure 11 is a front view of a lock nut joint, and Figure 12 is a partially cutaway front view of the same as above. It is a diagram. 1.4... Threaded reinforcing bar 2... Hexagon screw coupler 3a, 3b... Lock Nand 5... Marking for joining inspection 6... Half-split long NAND body 7... Oblong body 8... Recessed portion 9...Thread surface 9a...Screw thread
9b...Thread groove 10...Handle

Claims (1)

[Claims] Align the end of one threaded reinforcing bar with a lock nut and screw coupler attached in advance to the end of the other threaded reinforcing bar with a lock nut attached, move the screw coupler so that it straddles the ends of both reinforcing bars, and lock both sides. In the method for joining threaded reinforcing bars that are tightened with nuts, the ends of the threaded reinforcing bars are butted by abutting a half-length nut body so as to straddle the outer periphery of both ends of the reinforcing bars, and adjusting the pitch of the screws. joining method.