JPH0749695B2 - Reinforcing bar joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reticulated joint which is advantageous for reticulated rebars, particularly rebars with a medium or larger diameter and a very large diameter.

[Conventional technology]

The inventors of the present invention have disclosed in Japanese Patent Laid-Open No. 63-304861 a twin braided reinforcing bar in which longitudinal and lateral reinforcing bars are welded and the rebar spacing of the joint portion is twice the rebar spacing of the remaining general portion. Paired so as to be located on the same plane, and then each longitudinal and lateral reinforcing bars are welded, and the connecting reinforcing bars having the same bar arrangement interval as the joint portion of each braided reinforcing bar are overlapped over the joint portion of both braided reinforcing bars. At the same time, a joint of reticulated reinforcing bars was proposed in which the reinforcing bars of the connecting reinforcing bars were connected in the middle of the reinforcing bars of each joint.

[Problems to be solved by the invention]

When the reticulated reinforcing bars (a) are joined by the reticulated connecting reinforcing bars (b) during joints in the vertical and horizontal directions, the reinforcing bars are overlapped in multiple steps at the joint overlapping positions as shown in FIG. If the reinforcing bars are far apart from each other and this is used as a reinforcing brace for the concrete skeleton, the cover thickness of the concrete will change greatly from place to place, and the effectiveness of the reinforcing bars will be short, which is a structural disadvantage. Become.

[Means for solving problems]

The present invention has been proposed in order to solve such a problem, in which vertical and horizontal reinforcing bars are welded, and the vertical and horizontal joints have a rebar spacing of 2l which is twice the rebar spacing 1 of the remaining general part. Reticulated reinforcing bars and horizontal reinforcing bars are arranged at a distance of 2 l, which is the same as the horizontal reinforcing bar interval of the longitudinal end joints of the reticulated reinforcing bars, and the vertical reinforcing bars are arranged at a distance of 1 for vertical splicing. Of the rebar wire mesh and the vertical rebar are arranged at the same interval 2l as the vertical rebar interval at the end of the reticulated bar in the lateral direction of the joint, and the horizontal rebar is arranged at the interval 1 for the horizontal splicing. It consists of reinforcing bar wire mesh and arranges the reticulated rebars vertically and horizontally so as to be located on the same plane, and vertically splices over each surface of the reticulated rebars vertically adjacent to each other in the vertical joint portion of the reticulated rebar. And the reinforcing bars of the reinforcing bars are disposed between the adjacent reinforcing bars in the joint portion of the braided bars. As to be located, the reticulated reinforcing bar and the added reinforcing wire mesh are spliced together, and in the lateral joint portion of the reticulated reinforcing bar, while the disposing reinforcing wire mesh for the lateral direction splicing is arranged across the reticulated reinforcing bars adjacent to each other on the left and right. The braided mesh and the braided wire mesh are jointed so that the longitudinal rebar of the additional braided wire mesh for lateral joining is positioned in the middle of the rebar.

[Action]

As described above, according to the present invention, the longitudinal and horizontal reinforcing bars are welded, and the braided reinforcing bars having the longitudinal and horizontal joint portions having a rebar spacing twice as long as the rebar spacing in the remaining general rebar are located on the same plane. In the vertical and horizontal directions, at each of the vertical and horizontal joint positions, the longitudinal, splicing and transverse splicing wire meshes having the same bar arrangement interval as the joint portion of the braided rebar, respectively. By connecting the braided reinforcing bars through the braided metal nets so that the rebars of the braided wire mesh occupy intermediate positions of the rebars of the joints of the braided rebars In general, the reinforcing bar covering thickness can be reduced, and in the case of the double reinforcing bar, the effective strain of the reinforcing bar is increased.

〔The invention's effect〕

As described above, according to the present invention, when the reticulated reinforcing bar is spliced with the added reinforcing wire mesh, the reinforcing bar has a bar arrangement of three steps or less,
The concrete cover thickness of the rebar in the general section becomes smaller,
In the case of the double reinforcing bar, the effective strain of the reinforcing bar is increased, which is structurally advantageous.

〔Example〕

(A) is a braided rebar that constitutes the main reinforcing wire mesh, and the longitudinal and lateral rebars (1) and (2) are welded together, and the joint interval is twice the rebar spacing l of the general part (2l), and is in the same plane It is installed in the vertical and horizontal directions so as to be located above.

(B) is a reinforcing wire mesh disposed in the longitudinal joint portion of the reticulated bar, and the horizontal rebar (4) is arranged at the same interval 2l as the horizontal rebar spacing of the longitudinal end joint portion of the reticulated wire mesh (A). The bars are reinforced, and the longitudinal reinforcing bars (3) are arranged at intervals of 1.

(C) is a reinforcing bar wire mesh arranged in the lateral joint portion of the reticulated wire (A), and the vertical bar (3 ') is a vertical bar (1) of the lateral end joint part of the reticulated wire mesh (A). ) The same distance 2l as the distance is arranged, and the horizontal reinforcing bars (4 ') are arranged at the distance l.

Thus, in the longitudinal joint portion of the reticulated reinforcing bars (A), as shown in FIGS. 3 and 4, straddling the upper and lower reticulated reinforcing bars (A) on the surface of each reticulated reinforcing bar (A). It is arranged so that the back side of (B) abuts, and the same reinforcement wire mesh (B)
The reticulated reinforcing bars (4) are connected to the reticulated reinforcing bars (B) so that they are positioned in the middle of the adjacent rebars (2) in the joint portion of the reticulated reinforcing bars (A). . (Fig. 1,
(Refer to FIGS. 3 and 4) Although the reinforcing bar wire mesh (B) is originally used for the joint of the longitudinal bar (1), the horizontal bar (2) is also the same as the reinforcing bar wire mesh (B) in the central portion.
In order to connect with each other, the horizontal reinforcing bars (4a) are arranged between the vertically adjacent horizontal reinforcing bars (4) by the required length of the joint so that the horizontal reinforcing bars (4a) have the same spacing as the general reinforcing bars. (Refer to FIG. 1) Further, in the reticulated rebar (A) lateral joint portion, as shown in FIG. ) Is positioned in the middle of the adjacent vertical rebars (1) in the joint portion of the reticulated rebar (A), so that the added wire mesh (B) contacts the back of the reticulated rebar (A). Connect. (Figs. 1, 5, and 6
(See the drawing) FIG. 7 is an explanatory view showing a step of joining the reticulated reinforcing bar and the additional reinforcing wire mesh.

As described above, the reticulated reinforcing bar (A) has its longitudinal and lateral ends twice the distance l of the general part (2l), but the braided wire mesh (B) (C). For joining, the connecting rebars (3a) (3b) are provided at the longitudinal ends and the lateral center to distribute the required length of the joint.

(Refer to FIG. 1) Since the illustrated embodiment is configured as described above, the reinforcing bars do not overlap in multiple stages at the joint portion of the reticulated reinforcing bars (A).

In the conventional joint structure, as shown in FIG. 8, the minimum cover thickness t ₁ of concrete in the joint portion of the reticulated reinforcing bars and the cover thickness t ₂ of concrete in the general portion are different, but in the embodiment described above, FIG. As shown in, since the minimum cover thickness T of concrete can be taken at the position of the main reinforcement, there is no difference between the main reinforcement position and the concrete cover thickness at the general part,
Further, in the case of the double reinforcing bar, the effective bar H of the reinforcing bar is longer than the effective bar h of the reinforcing bar in the conventional joint structure, which is structurally advantageous.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a reticulated reinforcing bar joint according to the present invention, and FIG. 2 is an explanatory view showing the arrangement of reticulated reinforcing bars and added reinforcement wire meshes, FIG. 3 and FIG. Fig. 4 is a front view of the longitudinal joint portion of the braided reinforcing bar, respectively. Fig. 4 is a longitudinal side view, and Fig. 2 is a view in the direction of arrow C. Fig. 5 and Fig. 6 are the front view of the transverse joint portion of the braided reinforcing bar. 2 is a cross-sectional plan view, and FIG. 7 (a) and (b) are horizontal side cross-sectional views of a concrete structure in which reticulated reinforcing bars having the joint of the present invention are arranged. 8A and 8B show the construction process together. FIG. 8 is a cross-sectional plan view of a concrete structure in which reticulated reinforcing bars having a conventional joint are reinforced, and is a view XX in FIG. 9 below. Fig. 9 and Fig. 9 are perspective views showing a state in which the longitudinal and transverse reinforcing bars of the reticulated reinforcing bars are spliced with splicing metal bars. (A) ... reticulated rebar, (B) (C) ... reinforcing wire mesh,
(1) …… Vertical stripes, (2) …… Horizontal stripes, (3) (3 ′) ……
Vertical bars, (3a) …… horizontal bars, (3b) …… horizontal bars, (4)
(4 ') ... horizontal stripes, (4a) ... horizontal stripes.

Claims (3)

[Claims] 1. Vertical and horizontal rebars (1) and (2) are welded together, and the rebar spacing of each longitudinal and horizontal joint is the rebar spacing 1 of the remaining general part.
Double reticulated reinforcing bars (A) and horizontal reinforcing bars (4) are arranged at the same interval 2l as the horizontal reinforcing bar interval of the longitudinal end joint portion of the reticulated reinforcing bars (A). (3) is a reinforcing bar wire mesh (B) for longitudinal joining which is arranged at an interval l, and a longitudinal bar (3 ') is a longitudinal bar interval at the end of the braided bar (A) in the lateral joint direction. The reinforcing bars (C) are arranged at the same interval 2l, and the horizontal reinforcing bars (4 ') are arranged at the interval l to form a horizontal splicing wire mesh (C). Are arranged in the vertical and horizontal directions so as to be positioned in the vertical reciprocal rebar (A), and in the vertical joint of the reticulated rebar (A), the added reinforcement wire mesh (B ) Is arranged, and the reticulated iron bars (4) of the reinforcing wire mesh (B) are positioned in the middle of the adjacent rebars (2) in the joint portion of the reticulated reinforcing bars (A). (A) and 添筋 wire mesh (B)
At the lateral joint portion of the reticulated reinforcing bar (A), a reinforcing wire mesh (C) for laterally connecting is disposed across the reticulated reinforcing bars (A) adjacent to each other on the left and right, and The reticulated reinforcing bar (A) and the reinforcing bar gauze (C) are positioned so that the longitudinal reinforcing bar (3 ') of the joint reinforcing bar gauze (C) for splicing is located in the middle of the longitudinal reinforcing bar (1) of the reticulated rebar (A). ) Is a joint of reticulated reinforcing bars. 2. A horizontal reinforcing bar (4a) for connecting the braided horizontal bars (2) is arranged between vertically adjacent horizontal bars (4) in the vertical splicing reinforcement wire mesh (B). A reticulated reinforcing bar joint according to claim 1. 3. The connecting rebars (3a) (3b) for joining reinforcing wire mesh nets at the longitudinal end and the lateral center of the reticulated reinforcing bar (A), according to claim 1. Reinforcing bar joints.