JPH0788712B2 - PC member joint structure with braid made of high strength fiber - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a PC member with a braid composed of high strength fibers.

[0002]

2. Description of the Related Art In recent years, a precast concrete construction method has been implemented in order to shorten the on-site construction by shortening the on-site casting concrete and shorten the construction period.

In this type of construction method, a precast concrete member (hereinafter simply referred to as a PC member) molded as a structural member such as a pillar or a beam is assembled on site to construct a structure. Generally, mechanical joints such as lap joints, weld joints, crimp joints and filling joints are generally used for joining the reinforcing bars of the members.

[0004]

However, in the lap joint, there are cases where the length of the lap joint cannot be sufficiently secured due to restrictions such as the shape and size of the joint, and in the weld joint, considerable welding equipment is required. Not only is it necessary, but the quality of welding is easily influenced by the skill of the worker, and in mechanical joints, it is difficult to correct the error in the bar arrangement position of the reinforcing bar and it is often difficult to carry out smoothly.

The present invention has been proposed in order to solve the above-mentioned conventional problems, and it is possible to join the reinforcing bars of PC structural members such as columns and beams extremely easily, reliably and firmly. There is provided a joint structure of a PC member by a braid made of the high strength fiber.

[0006]

In the joining portion structure of a PC member using a braid made of high-strength fiber according to the present invention, a hook is attached to an end portion of a main bar protruding from an end portion of a PC member as a member to be joined. A hooked coupler or hook fitting is projected, the hook fitted coupler or hook fitting is bound by a braid made of high-strength fiber, and a concrete is cast around the hook fitted coupler or hook fitting.

[0007]

EXAMPLE FIG. 1 shows an example of a structure for joining a PC member with a braid made of high-strength fiber according to the present invention. At the tip of the main bars 2 and 2 made of protruding screw fist bar,
Couplers with hooks 3 and 3 are projected.

The hooked coupler 3 is screwed to the tip of the main bar 2 and fixed by a lock nut 4.

The braid 5 is bridged between the couplers 3 and 3 with hooks, and the ends of the braid 5 are bound to the hooks 3a and 3a of the couplers 3 and 3 with hooks, respectively. The braid 5 is reciprocated and laid across multiple layers according to the diameter of the braid 5 and the magnitude of the design stress (tensile force) acting on the main bar 2.

When the main bar 2 is round steel or deformed rebar, the hook metal fittings 6 and 6 having hooks 6a and 6a at the tips thereof.
Are provided in a protruding manner, and the metal fittings 6 with hooks are fixed to the tips of the main bars 2 by butt welding (see FIG. 2).

Then, the braid 5 is bridged between the hook metal fittings 6,6, and the ends of the braid 6 are hooks of both hook metal fittings 6,6.
It is bound to 6a and 6a.

The braid 5 is made of continuous high-strength fiber having high tensile strength and excellent performances such as elasticity, durability and alkali resistance. For example, aramid, polyarylate, or carbon fiber. A braid consisting of is used.

Further, the concrete 7 is filled around the braid 5, so that the PC members 1 and 1 are integrally joined.

Next, a method of joining PC members to which the joining portion structure according to the present invention is applied will be described step by step.

For example, P molded as a beam member
After suspending the C member 1,1 at the specified position and aligning it,
Temporarily fix (see Fig. 3).

Subsequently, the couplers 3 and 3 with hooks are attached to the tips of the main bars 2 and 2 protruding from the tips of the PC members 1 and 1, respectively.
(See FIG. 4).

Next, the braid 5 is tied to the hooks 3a, 3a between the couplers 3 with hooks and bridged (see FIG. 5).

Next, by inserting the twist bar 8 made of a reinforcing bar or the like into the substantially central portion of the braid 5, and twisting the braid,
The slack of the braid 5 is removed and an appropriate tension is applied (Fig. 6).
reference).

Then, a concrete 7 is cast around the braid 5 to be sufficiently cured (see FIG. 7).

FIG. 8 shows the structure of the joint portion of the PC rigid frame structure. The main bars 2,2 of the upper and lower column members 9,9 and the main bars 2,2 of the left and right beam members 10,10 are joined by the braid 5. Has been done.

FIG. 9 shows a joint portion of a PC wall type structure. The main bars 2,2 of the upper and lower wall members 11,11 and the main bars 2,2 of the left and right floor members 12,12 are connected by the braid 5. It is joined.

Further, FIG. 10 shows the structure of the joint portion of the PC wall type structure, in which the main bars 2, 2 of the left and right wall members 13, 13 and the front and rear wall members 14, 14 are joined by the braid 5. .

Then, at any joint, the concrete is
Is filled (not shown), and the PC members are integrally joined.

[0024]

Since the present invention is constructed as described above, it has the following effects.

Due to the flexibility of the braid, it is possible to easily correct the separation of the reinforcing bars and the misalignment of the joints, so these items have almost no effect on the workability, and PC It is most suitable for joining PC members because the error in the clearance between the members can be easily adjusted.

The operation of binding the braids is extremely simple and does not require any special device or skill.

Further, since no fire is used unlike the pressure-welded joint and the welded joint, it is safe in terms of fire protection and the PC member is not adversely affected by heat.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a joint structure of a PC member using a braid made of high-strength fiber according to the present invention.

FIG. 2 is a side view of the hook metal fitting showing a mounting state of the hook metal fitting.

FIG. 3 is a cross-sectional view of a joining portion showing a joining method of PC members.

FIG. 4 is a cross-sectional view of a joint part showing a method of joining PC members.

FIG. 5 is a cross-sectional view of a joining portion showing a joining method of PC members.

FIG. 6 is a cross-sectional view of a joining portion showing a joining method of PC members.

FIG. 7 is a cross-sectional view of a joint portion showing a method for joining PC members.

FIG. 8 is a vertical cross-sectional view of a joining portion showing a joining state of PC members of a PC rigid frame structure.

FIG. 9 is a vertical cross-sectional view of a joining portion showing a joining state of a PC member of a PC wall type structure.

FIG. 10 is a cross-sectional view of a joint portion showing a joint state of a PC member of a PC wall type structure.

[Explanation of symbols]

1 ... PC member, 2 ... main bar, 3 ... coupler with hook, 4
… Lock nuts, 5… braids, 6… hook fittings, 7… concrete.

Front page continuation (72) Inventor Akio Yabuuchi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-4-64645 (JP, A)

Claims (1)

[Claims] 1. A braid consisting of a high-strength fiber, wherein a coupler with hooks or hook fittings is provided at the end of a main bar protruding at the end of a PC member as a member to be joined, and the coupler with hooks or hook fittings is made of high-strength fiber. A structure for joining PC members with a braid made of steel strength fiber, characterized in that the above-mentioned coupler with a hook or a concrete is placed around the hook fitting.