JPS63289156A - Joint construction method of reticulated reinforcing bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a joint construction method for reticulated reinforcing bars.

(Prior art) Conventional mesh reinforcing bars made by welding vertical reinforcing bars and horizontal reinforcing bars are arranged at equal intervals over their entire length, and at the joint part, one of the mesh reinforcing bars (A) that is adjacent to the other mesh reinforcing bars is In such a way that the vertical reinforcing bars Cl of the other mesh reinforcement (A') are located between the adjacent vertical reinforcing bars (α) (α), and the overlapping length L≧+5 length as shown in Figure #c5. Both of the above-mentioned reticulated steel ribs (A) 01) were connected by superimposing each other so that the gap was 15 or more.

However, when the diameter of the reticulated reinforcing bars is increased, the bond length becomes significantly shorter than the cross section of the reinforcing bars, which increases the possibility of bond splitting failure. Therefore, as shown in Figure 6, the overlapping length L
≧2/+5Cr! It is necessary to connect as L.

In the figure, (b) (1/) indicates the horizontal reinforcing bars of each of the mesh reinforcing bars.

(The key point to be solved by the invention) In the conventional reticular reinforcing bar joint construction method, the vertical reinforcing bars (α) (1) are close to each other at the joint part, and the cross-section of the concrete relative to the cross-section of the reinforcing bars becomes smaller, which impairs the workability of concrete. , the filling properties are poor, and the longitudinal reinforcing bars at the joint are reticular reinforcing bars (
A) Since the reinforcement is arranged at a pitch greater than (N),
The amount of reinforcing bars at the joint increases.

The above tendency becomes more noticeable when the diameter of the reticulated reinforcing bars is increased.

Furthermore, compared to the case of small-diameter reticular reinforcing bars with the same reinforcement pitch, the cross section of the concrete surrounded by adjacent vertical reinforcing bars becomes smaller, increasing the possibility that the concrete will undergo bearing pressure splitting failure. It is necessary to increase the bearing area.

(Means for Solving the Problems) The present invention has been proposed to solve these problems, and involves welding vertical and horizontal reinforcing bars, and changing the spacing of the reinforcing bars at the joints to the arrangement of the remaining general parts. Connecting a pair of mesh reinforcing bars with twice the bar spacing by overlapping each other so that the joint part reinforcement of one mesh reinforcing bar is located between the adjacent joint part reinforcement of the other mesh reinforcing bar t-% This refers to the joint construction method for reticulated reinforcing bars.

(Function) As described above, in the present invention, the reinforcement spacing of only the joint part of the mesh reinforcing bars is twice the reinforcement spacing of the remaining general parts, and the joint part reinforcement of one mesh reinforcing bar is connected to the other mesh reinforcement. Since the two mesh reinforcing bars are overlapped and connected so as to be located between the adjacent joint part reinforcements of the reinforcing bars, the reinforcement pitch of the joint part of the mesh reinforcing bars constructed according to the present invention is as follows. The reinforcement pitch is the same as that of the general sections other than the joints of the column-shaped reinforcing bars.

(Effects of the Invention) As described above, according to the method of the present invention, the reinforcement pitch in the joint part of the reticulated reinforcing bars becomes equal to the reinforcement pitch in the remaining general part, and in the case of the conventional joint construction method shown in FIG. Since the concrete cross section is twice as large as that of the conventional method, the concrete workability and filling properties are improved, and the vertical reinforcing bars at the joint are arranged at the same pitch as the rest of the general section. Since the reinforcing bars are reinforced, the amount of reinforcing bars at the joint is 6th.
This is a significant savings compared to the conventional case shown in the figure.

Furthermore, according to the present invention, as described above, the reinforcement spacing at the joints of separate reinforcing bars is twice that of the conventional case shown in factor 6, so the concrete cross-sectional area between adjacent vertical reinforcing bars is 〇 (Embodiment) An embodiment of the present invention fully illustrated will be described below.

(P)CP') is the vertical reinforcing bar (1) (1) and the horizontal reinforcing bar (2) (
2')? Vertical reinforcing bars (1α) welded vertically and horizontally and at joints
(1'α) spacing, the remaining general section longitudinal reinforcing bars (1), (1
') is a reticulated reinforcing bar with the spacing l twice as large.

Among the above-mentioned mesh reinforcing bars, the longitudinal reinforcing bars (1α) at the joint of one mesh reinforcing bar [F] are the adjacent vertical reinforcing bars (1'α) at the joint of the other mesh reinforcing bar <P'>. The reticulated reinforcing bars (P) and CP' are cold-polymerized and connected so as to be located in the middle of CI'll.

Since the illustrated embodiment is constructed as described above, the longitudinal reinforcing bars (lα) (l
The pitch of 'α) is the same as the reinforcement pitch l of the general parts other than the joint parts of the mesh reinforcing bars (P) (P'). (See Figure 2) Therefore, the pitch l of the longitudinal reinforcing bars (1α) (1'α) at the joint of the mesh reinforcing bars (P)CP') is larger than the pitch l of the joint of the mesh reinforcing bars by the conventional construction method. Since the amount is doubled, the workability and filling properties of concrete are improved.

In addition, the longitudinal reinforcing bars (1
Since the reinforcing bars α)(l'α) are arranged at the same pitch as the remaining general parts, the amount of reinforcing bars in the joint part can be significantly reduced compared to the conventional case.

Furthermore, since the pitch of the vertical reinforcing bars (lα) (1'α) in the joint section is twice that of the conventional joint section,
1α) (1′α) (The cross-sectional area of C1 is doubled, and even if the reticular reinforcing bars CP) (Pyt large-diameter rebars are used, the compression received from each of the longitudinal reinforcing bars (lα) (1′→) This is advantageous against bearing stress cracking caused by force (see Figures 3 and 4).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the implementation status of one embodiment of the reticulated reinforcing bar joint construction method according to the present invention, FIG. Figures 4 and 4 are explanatory diagrams showing the state in which bearing stress cracking occurs in the concrete section at the joint, respectively, and are a cross-sectional plan view and a vertical sectional view, and Figures 5 and 6 are respectively the joints of conventional mesh reinforcing bars. FIG. CP) CP)...Network reinforcing bar, (1) (1... Vertical reinforcing bar, (1α) (1'α)... Vertical reinforcing bar at joint, (2)
(2')...Horizontal reinforcing bar.

Claims (1)

[Claims] A pair of mesh reinforcing bars are made by welding vertical and horizontal reinforcing bars, and the spacing at the joint is twice that of the rest of the general section. A joint construction method for reticular reinforcing bars that is characterized by overlapping and connecting the reinforcing bars located in the middle of adjacent joint reinforcements.