JPH0437219B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reinforcing bar joint device in which the diameter of the joint portion of the reinforcing bar is equal to or less than the diameter of the reinforcing bar.

(Prior art) As a conventional reinforcing bar joint device, a sleeve is fixed to the tip of one of the reinforcing bars to be joined, the tip of the other reinforcing bar is inserted into the sleeve, and the sleeve is crimped from the outside. Therefore, there is a method in which the abutting portions of both reinforcing bars are crimped with a sleeve.

(Problem to be solved by the invention) In the conventional example of connecting reinforcing bars using a mechanical joint, the diameter of this joint is larger than the diameter of the reinforcing bar.
If it becomes necessary to hang a stirrup or hoop around this joint, the cover thickness will be thinner in this area, and the main reinforcing bars will have to be moved inward to achieve the desired cover thickness. In addition, there is a disadvantage that the slab reinforcement that passes over this joint part will have a level difference with the adjacent slab reinforcement.Furthermore, when the reinforcement is placed through a through hole in the steel frame, it is difficult to connect the through hole. It had to be opened to match the diameter of the joint, which was larger than the reinforcing bar diameter, and there was a problem that the reinforcing bars would not fit properly after the reinforcing bars were placed.

An object of the present invention is to solve the above problems.

(Means for Solving the Problems) A feature of the present invention is that the diameter of the joint portion of the reinforcing bar is equal to or less than the diameter of the reinforcing bar. That is, the threaded rods each protrude from the axial center of the opposing ends of the reinforcing bars to be connected, and are positioned in opposing positions to each other. The threaded rod is made of a material with higher strength than reinforcing steel, and if carbon fiber is used as this material, higher strength and toughness can be ensured at the joint. Both threaded rods are connected by a joint member. The joint member has a female threaded hole in its axial center, and each threaded rod can be screwed into this female threaded hole from both end faces. The diameter of the joint member is equal to or smaller than the reinforcing bar diameter, that is, the joint member diameter is equal to or smaller than the reinforcing bar diameter.
A fixing member is disposed between the side end face of the joint member and the end face of the reinforcing bar, and the threaded rod and the joint member are coupled and fixed by this fixing member.

(Function) A threaded rod protruding from the reinforcing bar is butted and connected to a female screw hole of a joint member whose diameter is less than that of the reinforcing bar.

(Example) Examples of the present invention will be described below based on the drawings.

In FIGS. 1A and 1B, the rear end sides of threaded rods 3 and 4 made of carbon fiber are screwed to the axes of the ends of reinforcing bars 1 and 2 to be connected, and the tips of both threaded rods are screwed together. The sides protrude from the opposing end surfaces of the reinforcing bars and are positioned opposite to each other at a predetermined distance. A joint member 5 having the same diameter as the reinforcing bars 1 and 2 is attached to the left threaded rod 3 through a female threaded hole 5a. The female screw hole 5a of this joint member passes through the axial center of the joint member, and the threaded rods 3 and 4 can be screwed together. In addition, the left end surface of the joint member 5 and the left reinforcing bar 1
Fixed nuts 6, 6a are attached to the threaded rod 3 between the opposing end surfaces of the screw rod 3. In the state shown in FIG. 1C, a tape 7 serving as a fixing member is wound around the threaded rod 3 between the nuts 6 and 6a, and the connection between the threaded rod and the joint member 5 is fixed by this tape.

Next, the joint work will be explained.

After attaching the nuts 6, 6a and the coupling member 5 to the threaded rod 3 on the reinforcing bar 1 side in advance, as shown in FIG. and match them at a predetermined interval.
Next, as shown in Fig. 1B, when the nuts 6, 6a are turned to move the joint member 5 in the direction of the arrow, the tip end side of the threaded rod 4 is screwed into the female threaded hole 5a of the joint member, and eventually as shown in Fig. 1B. As shown, the right end surface of the joint member comes into contact with the end surface of the reinforcing bar 2, and at this point the threaded rod 3 and the threaded rod 4 are connected by the joint member. Then, reverse the left nut 6 and return it to the chain line position, and fix the nuts 6 and 6a to the reinforcing bars 1 and 6a, respectively.
2 to fix the connection between the reinforcing bars 1 and 2 and the threaded rods 3 and 4. Finally, tape 7 is attached to the outer periphery of the threaded rod 3 between the nuts 6 and 6a as shown in Fig. 1C.
, and finish the joint work. Wrap this tape until it has the same diameter as reinforcing bar 1.

Further, as shown in Fig. 2, nuts 6a1 and 6a2 are attached to the threaded rod 4 between the end face of the reinforcing bar 2 and the joint member 5 to strengthen the mutual connection between the threaded rod, the reinforcing bar, and the joint member. Good too.

Another embodiment is shown in FIGS. 3A and 3B.

In the example shown in FIGS. 3A and 3B, a sleeve 8 having a diameter equal to that of the right half is slidably fitted onto the outer peripheral surface of the left half of the joint member 15. Then, as shown in FIG. 3B, in the process of the joint work, the sleeve 8 is slid until it comes into contact with the end face of the reinforcing bar 1, and the space between this end face and the left end face of the joint member 15 is covered, and the injection port provided in the sleeve is A filler 9 mixed with an expansion material is injected from 8a to fill the space inside the sleeve and fix the connection between the threaded rod 3 and the joint member.

By mixing the expansion material into the filler material, the integration between the threaded rod 3, the filler material 9, and the sleeve 8 is strengthened.

In this example as well, two nuts may be attached to the threaded rod 4 between the reinforcing bar 2 and the joint member 15.

Further, other embodiments are shown in FIGS. 4A and 4B. In this example, a female screw hole 25a is provided on the right end surface of the joint member 25.
A recess 25b communicating with the recess 25b is formed, and a filler injection port 25c extending from the outer peripheral surface to the recess is provided.
A sleeve 8 is fitted around the outer periphery of the left half of the joint member 25, and an injection port 8a is provided in this sleeve. Nuts 6b and 6 are attached to the threaded rod 3 and the threaded rod 4 in contact with the end surfaces of the reinforcing bars 1 and 2, respectively.
c is attached.

To explain the joint work, first the joint member 2
5 from the position shown by the solid line in FIG. The threaded rods 3 between the threaded rods 3 and 4 are covered, and finally fillers 9, 9 are injected through the injection port 25c of the joint member and the injection port 8a of the sleeve 8 to fix the connection between the threaded rods 3, 4 and the joint member 25. .

To connect the reinforcing bars 1, 2 and the threaded rods 3, 4, as shown in Fig. 5, the mounting holes 1a, 2 are long enough to allow the rear ends of the threaded rods to enter the axial center of the reinforcing bars.
a, and insert adhesive 10 into this mounting hole.
The threaded rod may be fixed to the reinforcing steel by filling it with

(Effects of the Invention) As explained above, according to the present invention, since the joint portion of the reinforcing bar can be made smaller than the diameter of the reinforcing bar,
Even when a stirrup or hoop is hung around this joint, the cover thickness can be set without bringing the main reinforcement inward, and the diameter of the through-hole drilled in the steel frame can be as long as it can be penetrated by the reinforcing steel. There is no need to drill large diameter through-holes, so there is no sag after the reinforcement is placed, and it fits well.Furthermore, even when slab reinforcement is placed at the joint, the difference in level between adjacent slab reinforcement can be avoided. Does not occur.

[Brief explanation of drawings]

Figures 1A to 1C show one embodiment of the present invention;
The figures are front views showing other embodiments, Figure 3A, and Figure 3.
Figure B shows another embodiment, and Figures 4A and 4B are sectional views showing the process of jointing. The figure is a sectional view showing another example of a method of connecting reinforcing bars and threaded rods. 1, 2... Reinforcing bar, 3, 4... Threaded rod, 5, 1
5, 25...Joint member, 5a, 25a...Female screw hole, 7...Tape, 8...Sleeve, 9...Filling material.

Claims (1)

[Claims] 1. Consisting of a threaded rod, a joint member, and a fixing member for fixing the threaded rod and the joint member, the threaded rod is made of a member with higher strength than the reinforcing steel, and the connecting member is One end is screwed into the axial center of the reinforcing bar, and the other end protrudes from the reinforcing bar, with their tips abutting each other. is less than or equal to the diameter of the reinforcing bar, the fixing member is disposed between the side end surface of the joint member and the opposing face of the reinforcing bar, and both threaded rods are connected to each other through the female threaded hole in the joint member. A reinforcing bar joint device characterized in that the reinforcing bars are joined together. 2. The reinforcing bar joint device according to claim 1, wherein the fixing member is constructed by winding a tape. 3. The reinforcing bar joint device according to claim 1, wherein the fixing member comprises a sleeve and an expandable filler filled in the sleeve.