JP2926369B2 - Joint for hard and long objects such as rebar and joint method for hard and long objects such as rebar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a hard and long object such as a reinforcing bar, which reduces the work of storing an inflatable substance in a joint fitting and eliminates the loss of the stored inflatable substance. And a method for joining hard and long objects such as reinforcing bars.

[0002]

2. Description of the Related Art In general, when a hard long object such as a reinforcing bar or an FRP rod requires a length of, for example, 100 m, it can be manufactured, but it is hard. Because it is difficult to take up in a roll shape, transport and handling are inconvenient as it is,
Therefore, it is cut or formed to an appropriate length. However, if the object for such use is also formed short, it must be connected by the required length.

In order to realize such a technology,
For example, there is a method disclosed in Japanese Patent Application Laid-Open No. 58-222248. In this method, as shown in FIG. 4, an intumescent substance c is left as it is in a joint fitting b having openings a at both ends. After filling, a reinforcing bar d is inserted from the opening a, and the two reinforcing bars d are to be connected by the expansion pressure of the expandable substance c.

[0004] By the way, when the expansive substance c is to be filled into the joint fitting b every time it is needed at a construction site, the operation is extremely complicated and, as described later, the expansible substance is hydrated. Previously, since it had a granular shape, it could leak even immediately after filling in the joint fitting b, and had various problems that a considerable amount was lost when inserting the reinforcing bar d and when expanding. It is.

On the other hand, the loss of the expansive substance is reduced,
Japanese Patent Publication No. 52-7653 discloses a technique capable of further increasing the inflation pressure. As shown in FIG. 5, two rebars d are inserted into the hollow cylindrical joint fitting b having the rebar insertion holes e at both ends so as to abut each other from the rebar insertion holes e. The inflatable substance c is injected from an inflatable substance injection hole f formed in a part of the joint fitting b.

Therefore, according to this, not only is the expansive substance c to be injected into the joint fitting b every time the work is performed, but also it is necessary to add water after the expansible substance c is injected from the injection hole f. The injection hole f
Since only one is formed at one end, it takes a long time until a hydration reaction occurs in the entire expansible substance c when water is injected from this portion, and the expansible material is inflated as long as the injection hole f exists. It is clear that when the substance c expands, it leaks out of the injection hole f, and it is also clear that the expansion pressure is greatly reduced by such leaking. Therefore, the one shown in FIG. 5 had various problems.

[0007]

In order to solve the above-mentioned problems, a joint for a hard and long object such as a reinforcing bar and a method for joining a hard and long object such as a reinforcing bar according to the present invention are provided. The inflatable substance housed in a cylindrical bag body having a through hole therein is configured by being attached to the inside of a tubular joint fitting having both ends having openings, and A rigid elongate object such as a reinforcing bar is inserted into the cylindrical through hole from the opening at both ends without breaking the bag body, so that the inflatable material can connect the rigid elongate object such as a reinforcing bar by the inflation pressure of the inflatable substance. Thus, the work of storing the expandable substance in the joint fitting is reduced, and the loss such as leakage of the stored expandable substance is eliminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of a joint for a hard long object such as a reinforcing bar and a joint method for a hard long object such as a reinforcing bar according to the present invention.
Referring to FIG. 3 and FIG. 3, reference numeral 1 denotes a cylindrical fitting having openings 2 at both ends, and reference numeral 3 denotes an inflatable substance housed in a bag 4 having water permeability. Then, the inflatable substance 3 housed in the bag body 4 is mounted inside the joint fitting 1.

Here, the expansive substance refers to, for example, the following. That is, a swelling agent, a press-formed product or a crushed expanded sintered product, lime-based, calcium sulfoaluminate-based, calcined dolomite-based, magnesia-based, ordinary Portland cement-blast furnace slag-bauxite-gypsum-based And cement-expanding agents such as alumina cement-lime-gypsum, calcium aluminate-lime-gypsum, and the like, including "Blystar" (trade name of Onoda Cement Co., Ltd.).

The bag body 4 has a through hole 5 at the center, and the diameter of the through hole 5 in a state where the inflatable substance 3 is stored in the bag body 4 is a rigid elongate object such as a rebar described later. Preferably, the diameter is 6 or less. Examples of the hard elongated object 6 such as a reinforcing bar include an FRP rod in addition to the reinforcing bar.

[0011]

The inflatable substance 3 is prepared in a state of being stored in the bag body 4 in advance, and is mounted in the fitting 1 at the work (construction) site or factory.

Thereafter, two long hard objects 6 such as rebars are inserted so as to be inserted from both openings 2 of the joint fitting 1. Since the through holes 5 are formed in the bag body 4, The bag 4 can be inserted into the through hole 5 without breaking, and the expansible substance 3 does not leak.

After the hard elongated material 6 such as a reinforcing bar is inserted as described above, a hydration reaction is caused by adding water to the expansible substance 3 to expand the material. The object 6 is connected in the fitting 1.

Since the bag 4 used here has water permeability, it is denied that the expansible substance 3 leaks from the bag 4 during the hydration reaction as described above. Not something. However, since the viscosity of the expansive substance 3 is much higher than that of water and the periphery is covered with the bag 4, the amount thereof is small compared to the conventional example shown in FIGS. It can be said that it is almost nothing.

Incidentally, as a result of the experiment by the present inventors, the inflation pressure of the expansible substance 3 was 300 kgf / cm ² or more, so that the joint fitting 1 was 10 mm thick and 10 mm larger than the diameter of the rebar. If a steel pipe having an inner diameter and a length of about 15 to 20 cm is used, for example, the tensile strength of a rebar of D19 is 55.
Has a 2 kgf / mm ^2, slip in the reinforcing bar joint is not generated,
It has been found that the base material of all rebars breaks and is sufficiently practical.

[0016]

As described above, according to the joint method for a hard long object such as a bar and the joint method for a hard long object such as a reinforcing bar according to the present invention, the joint is formed into a cylindrical shape having water permeability and having a through hole therein. Since the inflatable substance housed in the bag body formed in the above is attached to the inside of the joint fitting formed into a tubular shape with both ends having openings, hard material such as a reinforcing bar is formed from the opening at both ends of the joint fitting. The long object can be inserted into the cylindrical through-hole without breaking the bag body, and a rigid long object such as a reinforcing bar can be connected by the inflation pressure of the inflatable material. This has the effect of reducing the amount of storage work and eliminating losses such as leakage of the stored expandable substance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a joint for a hard and long object such as a reinforcing bar and a method for joining a hard and long object such as a reinforcing bar according to the present invention.

FIG. 2 is a perspective view of an inflatable substance stored in a bag.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing a conventional example.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint fitting 2 Opening 3 Inflatable substance 4 Bag 5 Through hole 6 Reinforcing hard and long object

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000237134 Fuji PS Co., Ltd. 2-12-1, Tenjin, Chuo-ku, Fukuoka City, Fukuoka Prefecture Tenjin Building (73) Patent holder 000174943 Mitsui Construction Co., Ltd. Chiyoda, Tokyo 1-3-2 Otemachi, Ward-ku (73) Patentee 391005215 Onoda Co., Ltd. 4-1-1-13 Toyo, Koto-ku, Tokyo (72) Inventor Masamichi Tezuka 25-5 Otanidaicho, Moka-shi, Tochigi (72) Inventor Akira Shimamoto 3-14-7, Sakuragaoka Nishimachi, Nishi-ku, Kobe-shi, Hyogo (72) Inventor Katsumi Hino 3-2--4-405, Suwa, Tama-shi, Tokyo (72) Inventor Tsutomu Yoriyori Nakahama-cho, Amagasaki-shi, Hyogo No. 10 Shinko Steel Wire Industry Co., Ltd. (72) Inventor Norihiko Yamafuji 5707 Shijikura, Dejima-mura, Niibari-gun, Ibaraki Prefecture Inside Tokyo Seimitsu Co., Ltd. (72) Inventor Taku Tokumitsu Dazaifu, Fukuoka Prefecture Minutes 999-13 (72) Inventor Tomio Tamura 3-10-1 Iwamotocho, Chiyoda-ku, Tokyo Mitsui Construction Co., Ltd. (72) Inventor Shinsuke Kurihara 1548 Oya, Oaza-shi, Omiya City, Saitama Prefecture Field (Int.Cl. ⁶ , DB name) E04C 5/00-5/20 E04G 21/12 105

Claims (2)

(57) [Claims] 1. An inflatable substance housed in a cylindrical bag body having water permeability and having a through hole therein is mounted inside a joint fitting having a cylindrical shape having openings at both ends. A joint for a hard and long object such as a reinforcing bar. 2. An inflatable substance housed in a cylindrical bag body having water permeability and having a through hole therein is mounted in a joint fitting having a tubular shape having openings at both ends, Thereafter, a hard long object such as a reinforcing bar is inserted into the through hole of the bag body from both ends of the joint fitting, and the hard long object such as a reinforcing bar is connected by an inflation pressure of the expandable substance. A method for joining hard and long objects.