JPH09192769A - Production of groove lid structure member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a dressing material filled in a groove part from stripping away and from being blocked with a pebble or a dust and to keep the appearance function of a grating for a long time by using a groove lid structural member formed in a taper like groove of the opening width being made broader following to downward advancing to the shaped steel upper face side in the production of the grating. SOLUTION: In this using groove lid structural member, at first with hot rolling, a shaped steel 10a with a rectangle cross-section is inserted through between a holding circumference groove 1a having a recessing streak forming circumference groove 1b on the groove bottom of a roll R1 and a holding circumference groove 2a of a roll 2 in the vertical shape to cross by the right angle to the roll axial direction of the main face of the shaped steel and it is impressed in the shaped steel width direction. Therefore, the shaped steel 10a is made into the shaped steel 10b having a recess like 1a of the depth d1 in the side end face longitudinal direction of one end side of the width direction. Next, between rolls R3, R4 of the same opposite circumference face, the shaped steel 10b is inserted through, in the lateral shape so that the main face is made parallel to the roll direction and the upper part 11a of the shaped steel is positioned between the roll circumference faces, and the shaped steel 10c impressed in the thickness direction is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural material for a groove lid, which is made of a shaped steel having a concave portion, and more particularly has a dovetail-shaped concave portion which widens toward a side end face on one end side in the width direction of the shaped steel. The present invention relates to a method for manufacturing a structural material.

[0002]

2. Description of the Related Art Conventionally, a grating is a plate formed of a metal strip steel plate in a grid pattern as shown in FIG. 2 and is used for a groove lid, etc. The pitch between the bearing bars may be dangerous because heels of high heels, canes and bicycle tires may get stuck. In this case, there are some bearings with a large number of bearing bars for the purpose of narrowing the pitch between the bearing bars, but this not only increases the cost and weight, but also the gap between the bearing bars is narrow, so small stones, dust, etc. When it is clogged, it looks bad and has the drawback of spoiling the landscape. As a means for solving this, there is a method in which the upper surface is covered with a cosmetic material having an anti-slip function, but there is a problem that the cosmetic material has a problem such as peeling and falling off and spoils the scenery.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the above-mentioned drawbacks and to provide a method of manufacturing a structural material for a groove lid in which it is difficult to remove the filling material on the upper surface.

[0005]

In order to achieve the above-mentioned object, the groove lid structural material manufacturing method according to the present invention has an inverted trapezoidal outer cross section in which the width dimension decreases as the cross section goes downward in hot rolling. Forming a shaped steel having a groove with a surface that descends vertically from the upper part, and printing the outer side of the upper part of the inverted trapezoid between the pair of rolls from both sides, so that the concave part widens as it goes downward Is adopted, and has a shape shown in FIGS. 1 (A) and 1 (B).

After the grating made of the structural material for the groove lid is manufactured, the recess is filled with a decorative material having an anti-slip function and hardened so that the filler becomes wider as the shape of the recess goes downward. The shape prevents it from coming off easily.

Further, since the outer shape of the present groove lid structural material has an inverted trapezoidal shape in which the width becomes narrower from the upper portion to the lower portion, it is possible to prevent stones or dust from being clogged between the members.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be specifically described below with reference to the illustrated embodiments. Figures 3 and 4 show the first
It shows an example of a manufacturing process by hot rolling the structural member for groove lid shown in FIG. First, in the first step shown in FIGS. 3A and 3B, a holding circumferential groove 1a having a groove forming circumferential groove 1b on the groove bottom of the roll R1 and a holding circumferential groove 2a of the roll R2 facing the holding circumferential groove 1a. In the meantime, a die steel 10a having a rectangular cross section is inserted in a vertical shape whose main surface is orthogonal to the roll axis direction, and printing pressure is applied in the die steel width direction. As a result, the mold steel 10a becomes the mold steel 10b having the recessed line 11a having the depth d1 along the longitudinal direction on the side end surface at the one end side in the width direction.

Next, in the steps shown in FIGS. 4A and 4B, the mold steel 10b is placed between the rolls R3 and R4 on the same opposing peripheral surface.
Is inserted into a horizontal shape whose main surface is parallel to the roll direction, and the upper portion 11a of the mold steel is located between the roll peripheral surface portions, and printing pressure is applied in the thickness direction. As a result, the upper portion 11a of the mold steel 10b is narrowed down from both side surfaces to form an inner groove 11b having an inner side.

[0010]

According to the method of the present invention, since the groove portion having the tapered shape in which the upper recess portion of the shape steel is widened downward is formed, the structural material for the groove lid having the effect that the decorative material filled in the recess portion is hard to be removed. Can be easily manufactured. In addition, when the grating is made of the structural material for the groove cover, it is possible to prevent small stones, dust, and the like from being jammed, so that it has an effect of maintaining the function as the landscape grating for a long time.

[Brief description of the drawings]

FIG. 1 Structure material for groove lid obtained by the method of the present invention

FIG. 2 is a perspective view of a conventional groove lid.

FIG. 3 is a perspective view of a first step in one embodiment of the method of the present invention.

FIG. 4 is a perspective view of the second step.

[Explanation of symbols]

 R1, R2 Roll forming a ridge R3, R4 Roll for narrowing the ridge 10 Structural material for groove lid 10a to 10c Type steel 11a, 11b Recess

Claims (1)

[Claims] 1. In hot rolling, a shaped steel having a recess having a surface that descends vertically from the upper portion is formed in an inverted trapezoidal outer shape cross section whose width dimension decreases as the cross section advances downward, and the shape steel is reversed between a pair of rolls. By printing the trapezoidal upper outside from both sides,
A method for manufacturing a structural member for a groove lid, characterized in that the concave portion is formed so as to have a dovetail groove shape that widens downward.