JPS6018498Y2 - Rebar branch joint - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a branch joint structure for reinforcing bars that is used at points where reinforcing bars in three or more directions intersect in plan in a slab.

For example, in a building with a cylindrical upper part, the slab part has vertical and horizontal lattice reinforcing bars, a/
In addition, a reinforcement arrangement combining radial reinforcing bars B1 and circumferential reinforcing bars C may be adopted.

Conventionally, when performing this kind of reinforcement, grid reinforcing bars, a/
Fixation was performed by extending the end of the reinforcing bar C inward from the circumferential reinforcing bar C at the end.

Therefore, in the vicinity of the circumferential reinforcing bar C at the end, there are four types of reinforcing bars,
In other words, the vertical and horizontal lattice-shaped reinforcing bars, A/radial reinforcing bars, and circumferential reinforcing bars C are intertwined in a planar manner, creating a bottleneck in the construction process.

Furthermore, in view of the structural strength, shear reinforcing bars may be placed in the out-of-plane direction of the four types of reinforcing bars mentioned above, and the reinforcing bars become even more crowded.

The reinforcing bar branch joint of this invention was devised from the above-mentioned circumstances, and by using a joint that connects reinforcing bars from three or more directions that intersect in a plane at one place, it simplifies the reinforcement arrangement and facilitates construction. Efforts are being made to improve efficiency.

This invention will be explained below based on illustrated embodiments.

FIG. 3 shows an example of the branch joint of this invention, and FIG. 4 is a sectional view taken along line A-A.

In the figure, 1 is a coupler for connecting reinforcing bars 3 in three directions, and is formed from branch portions 2 in each direction, that is, in three directions.

The inside of the branch 2 is provided with a female thread corresponding to the male thread at the end of the reinforcing bar 3.

As the reinforcing bar 3, a deformed threaded reinforcing bar or the like is usually used, and is screwed into the branch part 2 of the coupler 1, and further tightened with a nut 4 to eliminate play between the reinforcing bar 3 and the coupler 1.

In addition, the coupler 1 of this embodiment (Figs. 3 and 4) integrates the branch part 2 in one direction with the branch parts 2 in the other two directions in a different level state, and the reinforcing bars in one direction are connected to the reinforcing bars in the other two directions. The reinforcing bars are parallel to each other and connected in different planes.

Therefore, even when a large number of reinforcing bars are used close together as shown in FIG. 5, interference between reinforcing bars can be avoided.

Furthermore, when using the invented branch joint, the reinforcement space can be used effectively.

In other words, in the conventional reinforcement arrangement, in a part where four types of reinforcement are intertwined on a plane, the reinforcing bars are arranged in four stages as shown in Fig. 6, whereas in the above embodiment, the reinforcing bars are arranged in four stages as shown in Fig. 7a and b. It only takes 2 or 3 stages.

Although this difference is only for one bar, the difference becomes large, especially in the reinforcement of slabs of important structures, where several sets of reinforcing bars are stacked in the thickness direction.

Figure 8 a'-e shows the procedure for connecting reinforcing bars 3.
Follow the steps below:

■ Screw nut 4 into one of the three sets of reinforcing bars (
Figure 8a).

■ Screw the coupler 1 into the reinforcing bar 3 in ■ until it reaches the specified position (Fig. 8b).

■ Rotate nut 4 in the opposite direction to ■, tighten it in the coupler 1 direction, and remove the play between reinforcing bar 3 and coupler 1 (
Figure 8C).

■ Attach the nut 4 to the second reinforcing bar 3 using the method shown in ■, and screw it into the coupler 1 shown in ■ (Fig. 8 d).

■ Tighten nut 4 in the direction of coupler 1 using method ■ to remove play between reinforcing bar 3 and coupler 1 (Fig. 8e)
.

■ Set the third reinforcing bar 3 using methods ■ and ■ to finish.

Note that the tightening of the nuts 4 shown in (1) and (2) may be performed at the end of the process.

9A to 9C show the connection procedure when a reverse threaded piece 9 is interposed between the branch part 2 of the coupler 1 and the reinforcing bar 3. By rotating the reverse threaded piece 9, the branch part 2 and Connect reinforcing bar 3.

In other words, this reverse threaded piece 9 is made by integrally molding a male threaded part with a reverse thread and a normal female threaded part.
At this time, the branch portion 2 has a female thread with a reverse thread.

As shown in FIGS. 10 and 11, this reverse threaded piece 9 can effectively transmit not only tensile stress but also compressive stress (power can be transmitted between connectors).

Next, the embodiment shown in FIGS. 12 to 15 will be described.

The coupler 1 of this embodiment has branch parts 2 in three directions independently, and a connecting piece 5 provided at the end of the branch part 2.
are overlapped and tightened with bolts 7 and nuts 8.

6 in the figure is a bolt insertion hole for this purpose.

Figures 14a and 14c and Figure 15 show the procedure for connecting the reinforcing bars 3 in this embodiment, which is carried out in the following manner.

■ Screw nuts 4 into the ends of each reinforcing bar 3 (14th
Diagram a).

(2) Screw the branch part 2 of the coupler 1 into the reinforcing bar 3 to a predetermined position (Fig. 14b).

■ Rotate the nut 4 in the opposite direction to ■ and tighten it in the direction of the branch 2 to eliminate the play between the reinforcing bar 3 and the branch 2 (Figure 14C).

(2) Place the reinforcing bars 3 in the predetermined positions and overlap the waist bolt insertion holes 6 at one location in each direction (Fig. 15).

■ Insert the bolt 7 into the bolt insertion hole 6, correct the position of the reinforcing bar 3, and then tighten with the nut 7 to complete the process.

Although these embodiments are all branch joints in three directions, joints in four or more directions are also possible depending on the reinforcement method, construction conditions, etc.

This invention has the above configuration and has the following advantages and features.

(1) Since reinforcing bars from three or more directions can be connected at one place, reinforcement arrangement can be simplified by using it in areas where reinforcing bars from different directions are intertwined in a plane.

(2) Since no anchoring length is required, the amount of reinforcing bars is reduced.

(3) Since the branches in at least one direction are unevenly shaped in a plane parallel to other branches, interference between reinforcing bars can be avoided even when a large number of them are used in close proximity.
In addition, the amount of reinforcing bars connected on the same plane requires less reinforcement space.

In this regard, the effect is particularly great when reinforcing is arranged in several layers in the thickness direction of the slab.

(4) By simplifying the reinforcement arrangement, the work becomes easier and the construction period is shortened.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of mat reinforcement used in cylindrical buildings, etc. Fig. 2 is a plan view showing the conventional reinforcement method, and Fig. 3 is a plan view showing an example of the branch joint of this invention. , Fig. 4 is a sectional view taken along the line A-A, Fig. 5 is a plan view showing an example of its use, Fig. 6 is a sectional view showing conventional reinforcement arrangement, and Figs. 7 a and b use the branch joint of this invention. 8a to 8e are front views showing the reinforcing bar connection procedure, and FIGS. 9a to 9C are sectional views showing the connection procedure when reverse threaded pieces are used.
Figures 10 and 11 are schematic diagrams showing the stress transmission at that time, Figure 12 is a plan view of another embodiment, Figure 13 is a front view thereof, and Figures 14 and 15 are connections of reinforcing bars. The procedure is shown in Figure 14a. b and c are front views, and FIG. 15 is a plan view. , a/... lattice reinforcing bars, b, b'...
・Radial reinforcing bars, C... Circumferential reinforcing bars, 1...
...Coupler 2... Branch, 3...
Reinforcing bar, 4... Nut, 5... Connection piece,
6... Bolt insertion hole, 7... Bolt,
8... Nut, 9... Reverse screw piece.

Claims (1)

[Scope of utility model registration request] At a point where reinforcing bars in three or more directions intersect in plan in the slab, it is formed from three or more branches with internal threads provided inside the cylinder, and the branches in at least one direction are parallel to the other branches. 1 by couplers provided at different levels within the plane.
．． A branch joint for reinforcing bars, characterized in that the ends of each of the reinforcing bars are connected and tightened with nuts.