JP3002704B2 - Rebar joint structure - 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 structure of a reinforcing bar mainly used for a basic reinforcing bar, and more particularly to a structure used for an L-shaped or T-shaped portion.

[0002]

2. Description of the Related Art When reinforcing bars are joined to each other in an L-shape or a T-shape in a reinforcing bar buried in a foundation concrete, the reinforcing bars are joined using an L-shaped joint bar bent along the bending direction. Is being done. That is, as shown in FIG. 5, one straight portion (4a) of the joint bar (1) bent in an L-shape is arranged along the transverse bar (2) of the reinforcing bar in one direction, and the other straight bar. (4b) is laid along the transverse bars (3) of the reinforcing bars arranged at right angles to the reinforcing bars, and the straight portions (4a) (4b) and the transverse bars (2) (3) are joined by being tightly connected to each other. In this case, at least two horizontal bars (2) and (3) of the reinforcing bars are arranged vertically parallel, and the upper horizontal bars (2) and (3) are used to resist the tensile force acting on the upper end of the foundation concrete. The lower horizontal streaks (2) and (3) resist the tensile force generated at the lower end side.

[0003]

When a reinforcing bar is joined using the joint bar (1) as described above, the length 1 of the straight portions (4a) and (4b) of the joint bar (1) is It is specified that the diameter is 45 times or more the diameter d of the joint bar (1). For example, in the case of the joint bar (1) having a diameter of 13 mm, the length l of the straight portion needs to be about 600 mm, which is 45 times the length.

Since the length of the joint bar (1) is very long as described above, for example, as shown in FIGS. 6 and 7, bar bars (A) (A) ( When A) is joined, a joint for joining a joint between the reinforcing bar (B) of the connecting portion connecting the parallel portions (A) and (A) and the parallel reinforcing bars (A) and (A). The streaks (1) may overlap each other at the central portion of the connecting portion (B). In this portion, the three streaks of the transverse streaks (3) and the joint streaks (1) and (1) overlap, and this overlapping portion is processed. In addition, it takes time and labor to perform the work, and it is difficult to join the joint reinforcement (1) in a state where the joint reinforcement (1) is completely parallel to the horizontal reinforcement (3). .

[0005] The present invention solves such a conventional drawback, and it is not necessary to lengthen the entire length of a joint bent into an L-shape at a joint portion to be joined to an L-shape or T-shape. It is an object of the present invention to provide a joint structure for reinforcing bars in which the ends of the bars do not overlap each other.

[0006]

In order to solve the above-mentioned problems, according to the present invention, in a joint portion of a reinforcing bar joined to an L-shape or a T-shape by using a joint bar, an upper side transverse bar joined to each other is joined. L-shaped upper muscles straddling the lower muscle and L-shaped lower muscles straddling between the lower horizontal muscles also joined to each other are end portions of the upper muscle and the lower muscle. Are connected by vertical connecting bars to form an integral joint bar.

[0007]

[Operation] The effective length of one straight portion of the joint bar connected by the vertical connecting bar is the entire length including the length of the connecting bar and the length of the upper and lower linear portions. In, the straight portion can be shortened by that amount.

[0008]

FIG. 3 shows a joint bar (11) according to the present invention. In the figure, (12) is an upper bar arranged along the upper horizontal bar of the reinforcing bar arrangement, and (13) is a lower bar arranged also along the lower horizontal bar. It is bent in an L-shape along the joint. And, on one straight part (14) (14) across the bent part,
The ends are integrally connected to each other by vertical up and down connecting bars (15). In addition, the other straight portions (16) and (16) not connected by the connecting bar (15) have a length of 45 times or more the diameter of the joint bar (11) as prescribed. On the other hand, the one straight portion (14) (14)
In, the sum of the length of the upper straight portion (14) and the connecting line (15) and the length of the lower straight portion (14) is set to be 45 times or more the diameter. . As a result, the straight portion (16) becomes longer as before for those not connected by the connecting line (15), but on the side of the connecting line (15), it can be made much shorter than the conventional one. it can.

FIG. 1 shows an example in which this joint bar (11) is used for a T-shaped portion. The joint structure is the same as before, and the straight part (14) on the upper side of the connecting line (15)
Is tightly joined to the upper horizontal streak (21) in the same direction, and the lower straight portion (14) is similarly tightly joined to the lower horizontal streak (21). On the other side, the upper straight portion (16) is connected to the upper transverse bar (23) of the reinforcing bar reinforcing bar (22) in the direction parallel to that, and the lower straight portion is also connected to the lower transverse bar (23). (16) is tightly joined.

[0010] Fig. 2 shows reinforcing bars (20) (2
0) has T at both ends of the reinforcing bar reinforcement (22) in a direction perpendicular to it.
In the case of joining to the mold, in this way, on the reinforcing bar (22) side of the connecting portion connecting the parallel reinforcing bars (20) and (20), the horizontal bar (23) of the connecting portion (22) The straight portions arranged along the straight line are arranged by arranging the shorter straight portion (14) of at least one joint bar (11) so that the straight portions of the two joint bars (11) and (11) They can be arranged without overlapping.

As described above, the length of the straight portion (14) on the connecting line (15) side can be reduced for the following reason. That is, as described above, of the upper and lower two horizontal streaks (21) and (21), both of them do not support the tensile force at the same time, but are always one of them. For example,
As shown in FIG. 4, in the case of (a) in which the tensile force acts on the upper straight portion (14), the tensile force acting on the upper straight portion (14) causes the connecting muscle ( The transmission from 15) to the lower straight section (14) results in resistance to tensile forces over their entire length. Therefore, the straight section (14) (14) and the connecting line (15)
It suffices that the sum of the lengths is at least 45 times the diameter of the rebar as a whole. On the other hand, in the case of (b) in which a tensile force acts on the lower straight portion (14), the lower straight portion (14) is connected to the upper straight portion (15) through the connecting line (15). Similarly, since the tensile force is transmitted to the side, it is only necessary that the entire length be at least 45 times the diameter of the rebar.

[0012]

As described above, according to the present invention, in the part where the upper and lower upper streaks are integrally connected to each other by the connecting streaks, the straight portion includes the upper and lower straight portions and the connecting streaks. It will be good if the total length is at least 45 times the rebar,
As a result, the length in the horizontal direction can be significantly reduced as compared with the conventional one. Therefore, the inconvenience of the joint bars overlapping each other can be eliminated, and the reduction in workability and the reduction in bar arrangement accuracy caused by such overlap can be prevented.

In addition, as described above, in the straight portion connected by the connecting line, the effective length of one straight portion includes the length of the other straight portion. The overall length can be shortened as compared to the length of the entire muscle. For this reason, it is possible to reduce the required weight of the entire joint bar, to reduce the material cost, to reduce the overall transport or transport weight, and to improve the working efficiency. Also, the number of tying points is reduced, and the time required for the arrangement work can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a T-shaped joint portion joined by using a joint bar of the present invention.

FIG. 2 is a perspective view showing a state in which the joints of the present invention are joined so as not to overlap each other.

FIG. 3 is a perspective view of a joint bar of the present invention.

FIG. 4 is a schematic diagram of a joint bar showing an effective length with respect to a tensile force.

FIG. 5 is a perspective view showing a structure of a conventional T-shaped joint in a reinforcing arrangement state.

FIG. 6 is a plan view of a T-shaped and T-shaped connecting portion showing a joint structure using a conventional joint bar.

FIG. 7 is a perspective view of a reinforcement arrangement of reinforcement bars joined to the H-shape.

[Explanation of symbols]

 (11) Joint bar (12) Upper bar (13) Lower bar (14) Straight section (15) Connecting bar (21) Horizontal bar (23) Horizontal bar

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 27/08 E04G 21/12 105

Claims (1)

(57) [Claims] 1. An L-shaped upper bar straddled between upper horizontal bars joined to each other at a joint portion of an L-bar or a T-bar which is joined by using a joint bar. The L-shaped lower muscles straddling between the lower horizontal muscles joined to each other are connected by vertical connecting muscles at ends of the upper muscles and the lower muscles to form an integral joint muscle. A joint structure of a rebar characterized by comprising.