JPH06123160A - Joint of hard, long-size member such as steel bar and method for joining same - Google Patents

Abstract

PURPOSE:To enhance workability by filling a tubular, water permeable bag having through-holes in its center with a cement expanding agent, etc., then mounting the bag in tubular joint fittings, inserting a pair of steel bars or the like into the through-hole of the bag, then causing expansion of the expanding agent. CONSTITUTION:A bag 4 having through-holes 5 in its center is filled with an expansible material 3 such as lime and calcium sulfur aluminates and is mounted in tubular joint fittings 1 having openings 2 at both ends thereof. Next, the end portions of two hard, long-size members 6 are inserted into both through- holes 5. Then water is added to the material 3 to cause hydration and the long-size members 6 are connected together inside the fittings 1 by means of the pressure of expansion. The members can thus firmly be connected together without causing slip at the joint, and the expansive material can easily be enclosed in the joint fittings while its leakage loss can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the work of storing expansive substances in joint fittings and eliminates the loss such as leakage of the stored expansive substances. The present invention also relates to a method for joining a rigid long object such as a reinforcing bar.

[0002]

2. Description of the Related Art Generally, a hard long object such as a reinforcing bar and an FRP rod is hard even if it can be manufactured when a length of 100 m is required. Since it is difficult to wind it into a roll, it is inconvenient to transport and handle as it is,
Therefore, it is cut or formed into an appropriate length. However, if such an object for use is also formed to be short, it will have to be connected by the required length.

As a means for realizing such technology,
For example, there is a method disclosed in Japanese Unexamined Patent Publication (Kokai) No. 58-222248, which is a method in which an expansive substance c is left as it is in a joint fitting b having openings a at both ends as shown in FIG. After filling, the reinforcing bar d is then inserted from the opening a, and the two reinforcing bars d are connected by the expansion pressure of the expansive substance c.

By the way, the expansive substance c is filled in the joint fitting b each time it is needed at a construction site. However, the work is extremely complicated and, as will be described later, the expansive substance c is added. Since it had a granular shape before, it had various problems that it could leak immediately after filling the joint fitting b, and a considerable amount of it would be lost when the reinforcing bar d was inserted and when it expanded. Of.

On the other hand, the loss of expandable material is reduced,
In addition, there is one disclosed in Japanese Patent Publication No. 52-7653, which can further increase the expansion pressure. As shown in FIG. 5, two rebars d are inserted into a hollow cylindrical joint fitting b having rebar insertion holes e formed at both ends so as to abut each other through the rebar insertion holes e, and then, The expansive substance c is injected through an expansive substance injection hole f formed in a part of the joint fitting b.

Therefore, according to this, not only is it necessary to inject the expansive substance c into the joint metal fitting b each time the work is performed, but also, after the expansive substance c is injected from the injection hole f, water must be added. Where it does not happen, the injection hole f
Since only one is formed at one end, it takes a long time for the hydration reaction to occur in the whole expansive substance c when water is injected from this part, and as long as the injection hole f exists It is clear that when the substance c expands, it leaks out from the injection hole f, and it is also clear that the expansion pressure greatly decreases due to such leakage. Therefore, even the structure shown in FIG. 5 has various problems.

[0007]

Therefore, in order to solve the above-mentioned problems, a joint of a hard long object such as a reinforcing bar and a method of joining a hard long object such as a reinforcing bar according to the present invention are provided with a water-permeable joint. Having an expansive substance housed in a cylindrical bag having a through hole in the inside, is configured by mounting the expansive substance inside a tubular fitting having openings at both ends, Insert a hard long object such as a reinforcing bar from both end openings into a cylindrical through hole without breaking the bag body, so that the hard long object such as a reinforcing bar can be connected by the expansion pressure of the expansive substance. As a result, the work of storing the expansive substance in the joint fitting is reduced and the loss of the stored expansive substance such as leakage is eliminated.

[0008]

Embodiments Next, an embodiment of a joint for a hard long object such as a reinforcing bar and a method for joining a hard long object such as a reinforcing bar according to the present invention will be described with reference to FIGS.
Further, referring to FIG. 3, reference numeral 1 is a tubular joint fitting having openings 2 formed at both ends thereof, and 3 is an expansive substance housed in a bag 4 having water permeability. Then, the expansive substance 3 thus stored in the bag body 4 is mounted inside the joint fitting 1.

Here, the expansive substance means, for example, the following. That is, a swelling agent, a pressure-molded one or a crushed one of an expansive sinter, a lime-based, a calcium sulphoaluminate-based, a calcined dolomite-based, a magnesia-based, an ordinary Portland cement-blast furnace slag-bauxite-gypsum-based , Alumina cement-lime-gypsum type, calcium aluminate-lime-gypsum type, etc., including "Blyster" (trade name of Onoda Cement Co., Ltd.).

Further, the bag body 4 has a through hole 5 in the center, and the diameter of the through hole 5 in a state where the expansive substance 3 is accommodated in the bag body 4 is such that a hard elongated object such as a reinforcing bar described later. The diameter is preferably 6 or less. As the above-mentioned hard elongated object 6 such as a reinforcing bar, there is, for example, an FRP rod in addition to the reinforcing bar.

[0011]

The expansive substance 3 is stored in the bag body 4 in advance, and the expansible substance 3 is mounted in the joint metal fitting 1 at the work (construction) site or factory.

After that, two hard elongated members 6 such as reinforcing bars are inserted so as to be inserted from both openings 2 of the joint fitting 1, but since the through hole 5 is formed in the bag body 4, The bag 4 can be inserted into the through hole 5 without breaking, and the expansive substance 3 is not leaked.

After inserting the hard elongated member 6 such as a reinforcing bar as described above, a hydration reaction is caused by adding water to the expansive substance 3 to cause expansion, and the expansion pressure of both expands the hard elongated member such as a reinforcing rod. The objects 6 are connected in the joint fitting 1.

Since the bag body 4 used here has water permeability, it is denied that the expansive substance 3 leaks from the bag body 4 during the hydration reaction as described above. Not a thing. However, the viscosity of the expansive substance 3 is much higher than that of water, and since the periphery thereof is covered with the bag body 4, the amount thereof is small compared with the conventional example shown in FIGS. 4 and 5 described above. It can be said that it is almost nothing.

As a result of the experiments conducted by the present inventors, the expansion pressure of the expansive substance 3 was 300 kgf / cm ² or more. Therefore, the joint metal fitting 1 has a wall thickness of 10 mm, which is 10 mm larger than the diameter of the reinforcing bar. If a steel pipe having an inner diameter and a length of about 15 to 20 cm is used, tensile strength of 55.
Has a 2 kgf / mm ^2, slip in the reinforcing bar joint is not generated,
It has been proved that all of the reinforcing bars are fractured in the base metal and have sufficient practicality.

[0016]

As described above, according to the joint of a rigid long object such as a streak and the method of joining a rigid long object such as a reinforcing bar according to the present invention, the joint has a cylindrical shape having water permeability and a through hole inside. Since the expansive substance contained in the bag formed in the above is mounted inside a tubular joint fitting having openings at both ends, it is made of a hard material such as a reinforcing bar from the opening at both ends of the fitting. Inserting a long object into the cylindrical through hole without breaking the bag body, it is possible to connect a hard long object such as a reinforcing bar by the expansion pressure of the expansive material, and therefore, of the expansive material for the joint fitting. This has the effect of reducing the storage work and eliminating loss such as leakage of the stored expansive substance.

[Brief description of drawings]

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

FIG. 2 is a perspective view of an expansive substance contained in a bag.

3 is a cross-sectional view taken along the line AA of FIG.

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

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

[Explanation of symbols]

 1 Joint metal fitting 2 Opening part 3 Expandable substance 4 Bag 5 Through hole 6 Hard long object such as rebar

Front Page Continuation (71) Applicant 000003528 Tokyo Rope Co., Ltd. 2-3-14 Nihonbashi Muromachi, Chuo-ku, Tokyo (71) Applicant 000237134 Fuji PS Co., Ltd. 2-12 Tenjin, Chuo-ku, Fukuoka-shi, Fukuoka No. 1 Tenjin Building (71) Applicant 000174943 Mitsui Construction Co., Ltd. 3-10-1 Iwamotocho, Chiyoda-ku, Tokyo (71) Applicant 391005215 Onoda Co., Ltd. 2-7-5 Minamisuna, Koto-ku, Tokyo (72) Inventor Masamichi Tezuka 25-5 Otanidai-cho, Moka-shi, Tochigi Prefecture (72) Inventor Akira Shimamoto 3-14-7 Sakuragaoka-nishicho, Nishi-ku, Kobe-shi, Hyogo (72) Inventor Katsumi Hino 3-2-Suwa, Tama-shi, Tokyo 4-405 (72) Inventor Tsutomu Kobayashi 10-1 Nakahama-cho, Amagasaki City, Hyogo Prefectural Shinko Steel Wire Industry Co., Ltd. (72) Inventor Norihiko Yamato 5707 Shishikura, Dejima-mura, Shinji-gun, Ibaraki Tokyo Steel Co., Ltd. In-house (72) Inventor Taku Tokumitsu 999-13 Kokubu, Dazaifu City, Fukuoka Prefecture (72) Inventor Tomio Tamura Chiyoda-ku, Tokyo Honcho 3-chome 10th No. 1 Mitsui Construction Co., Ltd. (72) of the invention's Shinsuke Kurihara Saitama Prefecture Omiya Oaza Otani 1548 address 98

Claims (2)

[Claims] 1. An expansive substance housed in a cylindrical bag having water permeability and a through hole inside is mounted inside a tubular fitting having openings at both ends. A joint for hard long objects such as reinforcing bars. 2. An expansive substance housed in a cylindrical bag having water permeability and having a through hole therein is mounted in a cylindrical fitting having openings at both ends, After that, a hard long object such as a reinforcing bar is inserted into the through hole of the bag from both end openings of the joint fitting, and the hard long object such as a reinforcing bar is connected by the expansion pressure of the expansive substance. A method of joining long items such as hard.