JP2574191Y2 - Fitting for threaded steel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded steel joint suitable for use in a joining method, a reverse driving method, and the like.

[0002]

2. Description of the Related Art In general, a joining method is a method which is employed when extending a building, for example, when extending a beam or a floor from a continuous underground wall, and as shown in FIG. It is constructed as follows using the rebar joint 1. That is,
The joint 1 has a cylindrical shape, and has a threaded hole 1a formed therein from one end surface to the other end surface. When performing the jointing method using this joint 1,
The joint 1 is provided in the concrete skeleton C to be expanded. In this case, one end of the joint 1 has a frame C
It is arranged so that it is exposed to the outside from the outside. Also, screw hole 1
A threaded reinforcing bar 2 in the frame C is screwed into one end of a, and is fixed by a nut 3.

[0003] When expanding the joint, the screw hole 1a of the joint 1
The screw rebar 4 is screwed into the other end of the screwdriver and fixed with a nut 5. And it expands using this screw reinforcing bar 4.

[0004]

[Problem to be Solved by the Invention] Screw nut 4 is connected to nut 5
When fixing the nut 5, it is necessary to tighten the nut 5 with a large torque in order to increase the fixing strength of the screw reinforcing bar 4. However, it is often difficult to strongly tighten the nut 5 because a large number of screw rebars 4 are arranged adjacently and it is difficult to secure a scaffold.

In such a case, the screw hole 1a and the screw reinforcing bar 4
When grout is filled in between, the fixing strength of the screw rebar 4 can be increased, the tightening torque of the nut 5 can be reduced, and the screw rebar 4 can be used without using the nut 5.
Just tightening is enough.

As a method of filling grout between the screw hole 1a and the screw reinforcing bar 4, there is a method of inserting a grout into the screw hole 1a before screwing the screw reinforcing bar into the screw hole 1a.
It is conceivable to insert grout after screwing the threaded rebar.

However, if grout is inserted into the screw hole 1a before screwing the screw rebar, there is a problem that the inserted grout leaks out of the opening outside the screw hole 1a. In particular, in the case of the reverse striking method, the grout cannot be inserted at all because the opening of the screw hole 1a faces downward.

[0008] On the other hand, after the screw rebar is screwed, the screw hole 1a
If the grout is inserted into the joint, there is no problem of the leakage of the grout. However, in the conventional screw joint 1 for a screw thread, since the grout injection hole is formed in the outer peripheral surface of the central part of the joint 1, the screw thread 4 is screwed into the screw hole 1a.
Grout could not be injected.

The present invention has been made in view of the above circumstances, and in a joint for a threaded rebar used in a joining method or the like, a screw which can inject grout into a threaded hole even after the threaded rebar is screwed. An object is to provide a joint for a reinforcing bar.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a joint for a screw rebar in which first and second screw holes extending from both end faces of a joint body toward the inside are formed. In the above, a grout injection port is formed inside the joint body, one end of the grout injection port is opened at one end face where the first screw hole is opened, and the other end is formed at an inner end of the first screw hole. It is characterized by being opened.

[0011] In this case, the first and second screw holes may be formed independently by forming a partition wall between the inner ends thereof, or one screw hole may be connected to each other. It may be formed as a hole. Further, in addition to the grout injection hole, another grout injection hole is formed, one end of the grout injection hole is opened on the end face of the joint body where the second screw hole is opened, and the other end is formed with the second screw hole. You may make it open in the edge part inside.

[0012]

When the joint for threaded reinforcing steel is used, for example, in a joining method, the joint is arranged in the wall with the end face where the first screw hole is opened exposed to the outside. Of course, a screw rebar is screwed and fixed in the second screw hole. Then, in order to connect a screw reinforcing bar for extension or the like to the joint, the screw reinforcing bar is screwed and fixed to the first screw hole. Next, grout is injected into the first screw hole from the grout injection hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. First, one embodiment of the present invention shown in FIG. 1 will be described. FIG. 1A is a longitudinal sectional view of a threaded steel joint 10 according to the present invention, and FIG.
(C) is a view taken in the direction of arrows X and Y in FIG. 1 (A).

In these figures, reference numeral 11 denotes a joint 10
Of the joint body 11 of FIG. One end of the joint body 11 is
As shown in FIG. 1B, it is formed in a circular cross section.
Although the other end is basically the same as the one end, FIG.
As shown in FIG. 2, a ridge 12 extending along the axis L is formed on the outer peripheral surface of the outer peripheral surface, thereby forming a non-circular shape.

Inside the joint body 11, one end surface 13 is provided.
A screw hole (second screw hole) 14 extending inward on the axis L from the other is formed, and a screw hole (first screw hole) 1 extending inward on the axis L from the other end surface 15.
6 are formed. A partition 17 is formed between these two screw holes 14 and 16.

A grout injection hole 18 is formed inside the joint body 11. This grout injection hole 18
Has an open end on the outer peripheral surface of the joint body 11, and the other end has an open end inner peripheral surface inside the screw hole 14.

Further, inside the joint body 11, a ridge 12
The grout injection hole 19 is formed at the position where is formed. The grout injection hole 19 is used for screwing a reinforcing screw for extension into the screw hole 16, one end of which is opened in the end face 15, and the other end is formed of the screw hole 1.
6 is open at the inner peripheral surface at the inner end.

Next, a description will be given of a case in which the jointing method is performed using the threaded steel joint 10 having the above-described configuration. As shown in FIG. 4, the joint main body 11 of the joint 10 is disposed in a concrete skeleton C of a building. In this case, it goes without saying that the end face 15 of the joint body 11 is exposed to the outside from the frame C. The screw hole 14 of the joint body 11 has a frame C
The reinforcing bar 2 arranged inside is screwed and fixed.

In this embodiment, the reinforcing bar 2 is connected to the partition 17.
Is screwed into the screw hole 14 until it comes into contact with the joint body 11, and after tightening with a predetermined torque, grout is injected into the screw hole 14 from the grout injection hole 18, whereby the rebar 2 is connected to the joint body 11
Although the connection is fixed firmly, it may be fixed using a nut. When the rebar 2 is fixed at a factory or the like, any fixing method may be adopted. However, when the rebar 2 is fixed at a construction site, it is desirable to use the method as in this embodiment. This is because a nut is not required.

Further, during the period from the time of construction of the building to the time of the start of the extension, the outside end face of the joint body 11 is prevented in order to prevent concrete or rainwater from entering the screw hole 16 and the grout injection hole 19. Is desirably covered with a lid 20. The lid 20 includes a base 21 having a cross section substantially similar to the end surface 15 of the joint body 11 and two protruding portions 22 and 23 protruding from the base 21.
The base 21 is pressed into contact with the end face 15 while the protrusion 22 is pressed into the screw hole 16 and the protrusion 23 is pressed into the grout injection hole 19.

Next, as shown in FIG. 5, the screw reinforcing bar 4 for extension is screwed into the screw hole 16 until it abuts against the partition wall 15, and tightened with a predetermined torque (for example, about 10 Kg-m). Then, grout is injected into grout injection hole 1.
9 is injected into the screw hole 16. The injection is stopped when the grout overflows from the opening of the screw hole 16. By injecting in this manner, the grout is filled between the inner peripheral surface of the screw hole 16 and the outer peripheral surface of the screw reinforcing bar 4. And, by the filled grout, the screw reinforcement 4
Are firmly fixed to the screw holes 16. Note that a nut (not shown) may be used to more securely fix the screw rebar 4, but in that case, it is not necessary to tighten the nut firmly.

As described above, the threaded rebar joint 1 of the present invention is provided.
0, since the grout injection hole 19 is opened at the end face 15 exposed to the outside from the concrete skeleton C,
After screwing the screw rebar 4 for extension into the screw hole 16,
Grout can be injected into the screw hole 16. Thereby, the screw rebar 4 can be connected to the joint body 1 without using a nut.
1 can be firmly fixed. Moreover, not only does it not require the use of nuts, but also it is not necessary to securely tighten the screw rebar 4, so that the screw rebar 4 can be easily connected to the joint body 11.

Further, after the screw reinforcing bar 4 is screwed into the screw hole 1,
Since the grout is injected into 6, a large amount of grout does not flow out from the opening of the screw hole 16 to the outside.
Grout can be filled even with the reverse striking method.

The present invention is not limited to the above-described embodiment, but can be changed as appropriate without departing from the scope of the invention. For example, the threaded steel joint 10A shown in FIG.
Is formed by connecting the first and second screw holes 14 and 16 as one screw hole. In the case of this embodiment, if the grout is injected into the screw hole 14 after the screw rebar is screwed into the screw hole 14, the grout leaks into the screw hole 16, so that the grout cannot be injected. Therefore, it is necessary to fix the screw rebar screwed into the screw hole 14 with the nut. In this regard, the embodiments described above are advantageous.

The threaded steel joint 10B shown in FIG.
Another grout injection hole 19 is formed in addition to the grout injection hole 19. Also, with the formation of the two grout injection holes, the cross-sectional shape of the joint body 11 is the same as that shown in FIG.

According to this embodiment, erroneous placement of the joint body 11 can be prevented. That is, in the case of the joint 10 shown in FIG. 1, if the end face 15 where the grout injection hole 19 is opened is arranged inside, the grout injection hole 1
9 cannot be used. In this regard, according to the joint 10B shown in FIG.
Even if any of the end faces 3 and 15 is exposed to the outside, the reinforcing screw can be fixed by grout. That is, either of the end faces 13 and 15 may be exposed to the outside. Therefore, misplacement of the joint main body 11 can be prevented.

[0027]

As described above, according to the joint for threaded rebar of the present invention, a grout injection hole is formed inside the joint main body, and the grout injection hole is opened at the end face of the joint main body. Grout can be filled between the screw reinforcing bar for extension and the screw hole into which it is screwed, not only in the jointing method but also in the reverse driving method. Therefore, the screw rebar can be firmly connected and fixed without using a nut. Further, since it is not necessary to firmly tighten the screw rebar or the nut, the effect that the screw rebar can be easily connected to the joint can be obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and FIG.
1B is a longitudinal sectional view, and FIGS. 1B and 1C are views taken along arrows X and Y in FIG. 1A, respectively.

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing still another embodiment of the present invention.

FIG. 4 is a partially omitted longitudinal sectional view for explaining a case in which a jointing method is performed using the threaded steel joint shown in FIG. 1;

FIG. 5 is a partially omitted longitudinal sectional view for explaining a case in which a joining method is performed using the threaded steel joint shown in FIG. 1;

FIG. 6 is a partially omitted longitudinal sectional view for explaining a case where a joining method is performed using a conventional threaded steel joint.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Joint for screw reinforcing bar 10A Joint for screw reinforcing bar 10B Joint for screw reinforcing bar 11 Joint body 14 Screw hole (second screw hole) 16 Screw hole (first screw hole) 17 Partition wall 19 Grout injection hole

Claims (4)

(57) [Scope of request for utility model registration] 1. A joint for a threaded rebar in which first and second screw holes extending from both end surfaces of a joint body toward the inside are formed, and a grout inlet is formed inside the joint body. A joint for a screw reinforcing bar, wherein one end of an inlet is opened at one end surface where a first screw hole is opened, and the other end is opened at an inner end of the first screw hole. 2. A partition wall is formed between inner ends of said first and second screw holes.
A joint for a screw reinforcing bar according to item 1. 3. The threaded joint according to claim 1, wherein the first and second screw holes are continuous with each other to form one screw hole. 4. In addition to the grout injection hole, another grout injection hole is formed in the joint body, and one end of the other grout injection hole is opened at an end face where the second screw hole is opened,
The joint according to any one of claims 1 to 3, wherein the other end is opened at an inner end of the second screw hole.