JPS6245937B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention uses a threaded joint to connect steel bars such as threaded reinforcing bars, by tightening them using a specially shaped locking nut, without using a special filling device. The present invention relates to a joint connection method in which a filler is press-fitted between a steel rod and a coupler.

Conventionally, as a connection method for a threaded joint, a method has been adopted in which a filler is press-fitted between the male and female threads of a steel rod and a coupler, and the filler is then hardened (Japanese Utility Model Publication No. 52-7943). In this method, a coupler B is screwed in advance to the ends of a pair of steel rods A,
Filler C is injected through a hole provided in the center of the coupler using a special filling device, and hydraulic or electric power is usually used as the power source for the filling device.

However, if a special power generating device such as a hydraulic pump is incorporated as the filling device,
It is difficult to move and handle due to its large weight, and in the case of an external power source such as electricity, handling of power lines, etc. is complicated, especially in high places such as the assembly area of ordinary reinforced buildings. Workability was extremely poor under conditions of scaffolding where things were complicated.

The present invention has been made in view of the above-mentioned problems, and provides a joint connection method that allows press-fitting and filling of a filler easily and manually.

Next, the present invention will be explained using figures.

FIG. 2 is a sectional view showing the connected state of steel rods fastened according to the present invention, and is a steel rod 1 having a male thread at the end.
a and 1b are connected using a coupler 2 with a filler intake part at the end, and tightened using lock nuts 3a and 3b having a special bag shape, and filler 4 is filled between the male and female threads. show.

The end of the coupler 2 is provided with a drawing part 2-1 so that the filler 4 can be easily press-fitted therein, and an air vent hole 2-2 is provided in the center. 3a and 3b are external perspective views of the lock nuts used in the present invention. Each of the lock nuts 3a and 3b has a bag portion 3a at one end.
-1, 3b-1, and this bag portion 3a-1, 3b
-1 is configured so that the inner diameter of the coupler portion 2 and the outer diameter of the coupler portion 2 fit together.

Next, the connection method of the present invention will be explained using FIGS. 4 and 5.

First, the steel rods 1a, 1b, coupler 2, and lock nuts 3a, 3b constructed as described above are arranged as shown in FIG. In this state, the bag portions 3a-1 and 3b-1 of the lock nut are coated with the filler 4 or filled in advance. Since the bag portion of the Locknut is open, the application work can be easily performed manually.

Next, as shown in FIG. 5, the lock nuts 3a and 3b are manually tightened into the coupler 2. At this time, Katsu puller 2
Since the outer diameter of the filler 4 fits into the lock nut bag portions 3a-1 and 3b-1, the filler 4 fits into the coupler's intake portion 2-
1, the steel rods 1a and 1b are press-fitted between the male and female threads of the coupler 2, but this pressing force is applied to the lock nut 3.
It can be easily applied by tightening a and 3b with a simple tool such as a spanner. At this time, in order to prevent the filler 4 from leaking in other directions, it is also effective to seal the bottom of the bag with a gasket or the like.

In the above way, finally Locknut 3a,
3b, the filler 4 can be press-fitted between the male and female threads of the steel rods 1a, 1b and the coupler 2, as shown in FIG. At this time, tighten the lock nuts 3a and 3b one at a time, and visually check whether the filler overflows from the hole 2-2 in the center of the coupler when tightening, to ensure that the filler is steadily press-fitted between the steel rod and the coupler. You can also check that.

In this way, the screw joint can be fixed by hardening the filler, but the lock nut 2
It is also possible to obtain the effects of both the filling method and the torque tightening method by tightening a and 2b to a certain torque manually or mechanically. Furthermore, a half-split sleeve in which the steel rod is divided in the axial direction can also be used as the sleeve having an internal thread.

As described above, the present invention has the effect that the filler press-in operation can be easily performed manually, whereas conventionally a special filling device has been used. This is particularly effective when assembling reinforced steel buildings, which often requires connection work on unstable scaffolding at high places.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventionally used filler press-fit joint, Figure 2 is a sectional view of a joint according to the present invention, Figures 3a and b are perspective views of a lock nut, and Figure 4
5 and 5 are cross-sectional views showing the joint connection procedure. 1a, 1b...Threaded steel rod, 2...Sleeve-shaped coupler, 3a, 3b...Lock nut, 4...
…filler.

Claims (1)

[Claims] 1. In a threaded joint consisting of a pair of steel rods with male threads at the ends, a sleeve-shaped coupler with a female thread on the inner surface that can be screwed into the male thread, and a lock nut, one end of the lock nut is shaped like a bag, and the lock nut is pre-bag-shaped before tightening. Apply filler to the area,
A method for connecting a steel rod with a threaded joint, characterized in that a filler is press-fitted and hardened between the male and female threads of the sleeve-like coupler portion, which has an outer diameter that fits into the inner diameter of the bag portion, by tightening a lock nut. .