JPH076590B2 - Flat steel with ribs - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a flat steel bar provided with ribs on one side.

Background of the invention: Concrete pipes used for laying in sewers, for example,
Recently, the method of embedding in an open-cut section that has been open cut has become less adopted, and the method of laying by excavation is often adopted. Therefore, it is necessary to make the outer diameter of the joint portion of the concrete pipe to be buried uniform, and the joint portion has a structure as illustrated in FIG. That is, this joint (30) has a steel plate ring (31) attached to the end of one concrete pipe (C) so that it does not interfere with the connection, and another concrete connected to this concrete pipe (C). The tip portion (C ″) of the pipe (C ′) is fitted in the ring (31) so that it can be sealed by the seal ring (35) and the gasket (36).

However, as a matter of course, the joint ring (31) has a base part integrated with the end of the concrete pipe, so that a plurality of round bar ridges (32) are attached to the inner peripheral surface of the concrete pipe. It is designed to be integrally molded when the tube is manufactured. Usually, in order to form such a ring with ridges, a strip-shaped steel plate cut to a required width is wound around the ring and welded, and a ring of reinforcing bars is welded along the inner peripheral surface to form the ring. There is. Therefore, not only is the construction cost high,
If welding is not done securely, there is a problem that the strength is reduced and the joint part of the concrete pipe is damaged, which may cause leakage.

For this reason, it is desired that the embedded ring (protrusion) is integrated so that the joint part, particularly the metal ring, is more rational, has high strength, and is stable.

In addition, the outer frame of a manhole cover made of concrete, and other strip-shaped metal plates with auxiliary ribs are generally used by welding the rib material to a steel plate or flat steel cut to the required dimensions. However, no matter how much the welding technology can be improved and automated in recent years, the processing cost for welding becomes high and a lot of labor is required. Therefore, it is inevitable that the cost becomes high.

Means for Solving the Problems: The present invention is provided on one side of flat steel formed by rolling.
An object of the present invention is to provide a flat steel bar with ribs, which can be used for the intended work as it is by forming ribs and other protrusions, projections, etc. integrally and bending them to a required dimension at the time of use.

That is, in the present invention, in flat steel having a required width, a rib having a trapezoidal cross-section is provided on one surface of the flat steel so as to project in the longitudinal direction, and at least an appropriate interval is provided between the rib and one side end. The protrusion is formed so as to be shorter than the rib.

As the ribs in this flat steel, a plurality of ribs protruding in parallel at required intervals are used. Of course, it is optional to provide only one rib.

Further, the flat steel of the present invention is provided with protrusions, for example, between the rib and one side edge on a surface other than the rib provided on one surface of the flat steel so as to increase the area of adhesion to concrete and have decorativeness. Can be

Regarding the shape of the protrusion, it may be a ridge parallel to the rib, or a large number of spot protrusions may be arranged at a required ratio, or a striped pattern may be arranged.

In addition, the protrusion provided on one side of the flat steel other than the rib may be provided on the entire surface.

Action: Since the flat steel of the present invention can form the above-mentioned constitution at the same time at the time of rolling, it has an integrated structure, and if the rib height is set to correspond to the shape of the object to be processed. ,
It is also easy to bend the ring or frame with the rib forming side inside.

In order to use this flat steel as a ring for jointing concrete pipes, for example, the ribs should be bent to the required diameter with the rib forming side inside, and the joints should be welded to form an endless ring. If the forming portion is embedded in the concrete pipe portion, the rib and the protruding portion formed other than the rib are brought into close contact with the concrete to increase the contact area, thereby improving the stability. Of course, as the ring used for such a joint, a ring provided with a protrusion only from the rib forming portion to one side edge is used.

For applications that do not require bending, increase the height of the ribs within the rollable range and set the intervals between the ribs to be set arbitrarily. If they are welded together, a member having a T-shaped cross section can be easily manufactured, and the occurrence of distortion can be reduced.

Examples Specific examples of the flat steel with ribs of the present invention will be shown below.

FIG. 1 shows a typical example, in which a flat steel (1) has a required width (W) and two ribs (3) (3 ') are formed in the intermediate portion of one side of the substrate (2). Are provided in parallel with each other, and a plurality of ridges (4) are provided between the ribs (3) (3 ') and one side edge in parallel with the ribs (3) (3'). is there. The ribs (3) and (3 ') are trapezoidal in cross section (though not limited to this, it is preferable to form a reasonable shape by drafting from the base side toward the upper end in manufacturing). It has become. Further, the plurality of protrusions (4) provided are formed to be lower than the height of the ribs (3) and (3 '). A flat surface is formed between the rib (3 ') on the front side in the figure and one side edge, and an end edge (5) is formed as an inclined surface. The opposite surface (the back surface in the figure) is a flat surface.

The flat steel (1) having such a structure is suitable for use as a ring for jointing concrete pipes, for example. In this case, the ribs (3) and (3 ') forming surfaces are wound and bent so as to be inward. To do. The outer diameter of this ring should match the outer diameter of the concrete pipe (C), and the ribs (3) (3 ')
And the ridges (4) are embedded in the concrete (see Figure 2).

With this configuration, the ribs (3) and (3 ') and the large number of protrusions (4) increase the adhesion area with the concrete, and the ribs (3) and (3') act in the axial direction at the time of burying. The flat steel has a large cross-sectional modulus and a large resistance to the external force, and thus it can be used as a strong joint ring. Of course, in this case, the portion where the ridge (4) is not provided serves as a sealing surface with the end peripheral surface of the fitted concrete pipe. The beveled edges (5) serve to facilitate the acceptance of concrete pipes at the joint.
This slope portion may not be formed if necessary.

Fig. 3 shows that one side of flat steel (1A) is provided with ribs (3) protruding at required positions, and a large number of protrusions (4) are provided on all parts other than the protruding portion of the ribs (3). There is.

According to this structure, the flat steel (1A) is bent into a frame shape with the rib (3) and the ridge (4) forming surface facing inward so that concrete is poured into the flat steel (1A). When solidified, it serves as a reinforcing ring for the manhole cover, which is integrated at the joint and serves as an outer frame with high reinforcing strength.

Further, the flat steel can be directly sized to a required size and used for decoration.

This flat steel can be integrally formed by sequentially performing several rolling operations using rolling rolls in the rolling process, so it is used when increasing the cross-sectional strength by rib attachment or when the rib has a role other than strength. As
It is possible to produce a product with ribs without secondary processing, and it is possible to obtain a flat steel having a high cross-sectional strength without significantly increasing the weight per unit length.

Since it can be manufactured by rolling, in addition to ribs (3) and (3 '), in addition to ridges, spot-like protrusions (6) as shown in FIG.
Are formed in a staggered arrangement, for example. Alternatively, as shown in FIG. 5, it is also possible to form an arbitrary pattern on the flat portion, such as forming protrusions (7) in a grid pattern. Of course, ridges, spot-like projections, striped patterns, etc. can be formed by combining them in any distribution.

The ridges may have a trapezoidal cross section, a wavy cross section, a sawtooth cross section, or the like.

When it is used in the decorative part as described above, the above-mentioned pattern can be selected to obtain a product having a high aesthetic effect.

Further, the distance between the ribs (3) and (3 ') is set to be relatively narrow so that both ribs (3) and (3') serve as fixing reference pieces for separate mounting members as shown in FIG. The flat steel (1) and the plate material (10) can be easily positioned and integrated by applying the ends of the plate material (10) between these ribs and welding them. In this case, since the welding is performed at the rib portion, the substrate (2) portion is not melted, and therefore distortion is less likely to occur and accurate joining can be performed.

For this reason, it is possible to use the rib-forming surface without forming the projections on the other portions, if necessary.

EFFECTS OF THE INVENTION According to the present invention, as described above, ribs and protrusions are integrally formed on a substrate at the time of rolling to increase the section modulus, and at the time of use, they have a close effect on other objects. And the cross-sectional strength can be easily increased, the workability is remarkably improved, the cost of the processed product can be reduced, and the decorative property can be imparted.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of the flat steel of the present invention, FIG. 2 is a partial vertical sectional view when used as a ring for concrete pipe joints, and FIGS. Is a perspective view showing
FIG. 6 is a cross-sectional view showing an example in the case of welding in combination with separate members, and FIG. 7 is a cross-sectional view of a conventional concrete pipe joint portion. (1) (1A) ... flat steel, (2) ... substrate (3) (3 ') ... rib, (4) ... ridge (5) ... edge, (6) ... spotted Protrusion (7) …… Lattice-striped protrusion, (10) …… Plate material (C) …… Concrete pipe

Claims (8)

[Claims] 1. A flat bar having a required width, one side of which is provided with a rib having a trapezoidal cross section in the longitudinal direction at an intermediate position in the width direction, and an appropriate interval is provided at least from the rib to one side end. The flat steel with ribs is characterized in that a protruding portion that is shorter than the rib is formed by protruding. 2. The flat steel with ribs according to claim 1, wherein a plurality of ribs are formed on one surface, and the ribs are projected in parallel with each other at a required interval. 3. The rib according to claim 1, wherein the protrusion formed between the rib and one side end is a plurality of protrusions and is formed so as to protrude in parallel with the rib. With flat steel. 4. The flat steel plate with ribs according to claim 1 or 2, wherein the protrusion formed between the rib and one side end is a large number of independent protrusions or stripes. 5. The flat steel with ribs according to claim 1 or 2, wherein, in addition to the rib formed on one side, a protrusion is formed on the entire one side. 6. The flat steel with ribs according to claim 5, wherein the projection formed on one surface has a plurality of projections provided in parallel. 7. The flat steel plate with ribs according to claim 5, wherein the protrusions formed on one surface have a large number of independent protrusions or striped patterns. 8. A projection formed on one side of the projection has a required section as a projection and the other projection as an independent projection or a striped pattern, according to any one of claims 1, 2 and 5. Flat steel with ribs described in.