JPH01237002A - Manufacture of structural steel for channel cover - Google Patents

Abstract

PURPOSE:To make the height of a projection large and to prevent a large slip by forming a projecting stripe on a side face in the width direction of a shape steel and making a height of the projecting stripe large by drafting by use of rugged and projected peripheral face rolls for hot rolling. CONSTITUTION:In a 1st stage, a shape steel 10a of a rectangular section is passed between a holding peripheral groove 1a having a groove 1b for a projecting stripe forming on the groove bottom of a roll R1 and a holding peripheral groove 2a of a roll R2 opposing to the roll R1 so that the main face of the steel 10a orthogonally and vertically crosses to the roll axis direction and the steel 10a is drafted in the width direction of the steel 10a. Thus, the steel 10a is formed into a shape steel 10b having a projecting stripe 11a on a side face in the width direction along the longitudinal direction. Then, the steel 10b is passed between rolls 3a, 4a having respectively opposing peripheral faces of an equal size where annular grooves 3c, 4c exist between narrow projecting peripheral faces 3a, 4a and wide projecting peripheral face 3b, 4b. The steel 10b is drafted in the thickness direction by inserting the steel 10b so that the main face of the steel 10b in a horizontal position to be parallel to the roll axis direction and the stripe 11a is positioned between the narrow projecting peripheral faces 3a, 4a. Hence, the sectional area is drafted to be formed into an I-shaped section and is also thinned and to be formed into a shape steel 10c with a projecting stripe 11b.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a structural material for a groove cover made of a shaped steel having a rectangular or I-shaped cross section, particularly a core shaped steel having a projection for preventing slip on the side end surface of one end in the width direction. The present invention relates to a method of manufacturing the structural material having a portion.

(Prior art) As shown in Fig. 10, when installing a one-way cover on a road FI groove or manhole A, an upright strip is used as a groove cover B with high load resistance to allow automobiles to pass through. A large number of short strips are welded at both ends and erected in parallel between both long sides of a rectangular outer frame a made of plates, and a plurality of twisted wire rods (twist bars) C made by twisting wire rods having a substantially square cross section. Conventionally, books have been commonly used to form a lattice-like structure by arranging books in parallel in a direction orthogonal to the short strips and welding them together.

Generally, steel shaped steel with a rectangular or single-shaped cross section is used for the above-mentioned short strips, but since both surfaces of the short side in the cross section are flat, it is difficult to use this for the groove cover. It was dangerous for automobile tires passing through the structure to easily slip along the flat top surface of the shaped steel.

Therefore, the present inventor previously proposed, as Toragan No. 117945/1983, that a steel section having a rectangular or I-shaped cross section has protrusions for preventing slipping arranged at constant pitch intervals on one surface of the shorter side of the cross section. We are proposing a structural material for groove lids that has a .

(Problem H to be Solved by the Invention) However, in the past, the protrusions of the structural material have been formed by forming an uneven peripheral surface corresponding to the protrusions on the surface of the shaped steel, that is, the side end face on one end side in the width direction, during hot rolling. It was formed by printing pressure with a roll, but with normal printing pressure, the 11th
As shown in the figure, the protrusion forming recess 5c of the roll mold R5
The molded steel 10a, which is the workpiece material, was not filled sufficiently (this is generally referred to as "sinking" in the industry), and a protrusion of sufficient height could not be obtained. In addition, when the printing pressure is increased, the mold mesh body buckles and deforms, resulting in shape deformation and dimensional accuracy. Therefore, with a conventional protrusion? ja
The groove cover made of M material exhibits a greater anti-slip effect than the general groove cover made of the above-mentioned shaped steel without protrusions, but it is sufficiently satisfactory because the height of the protrusion is low. However, the current situation is that it is desired to realize a greater anti-slip effect.

(Means for Solving the Problems) In view of the above-mentioned circumstances, an object of the present invention is to provide a method for manufacturing a groove cover structural material in which the height of the protrusion is high and, therefore, a large anti-slip effect can be exhibited. There is.

That is, the method for manufacturing a structural material for a groove cover according to the present invention is as follows:
In order to achieve the above object, in hot rolling, the side end surface of either one or both ends in the width direction of a steel shaped steel having a rectangular or I-shaped cross section is pressed with a roll having a circumferential groove. A configuration is adopted in which protrusions are formed along the longitudinal direction of the mold steel, and the top surface of the protrusions is pressed by a roll having an uneven peripheral surface to form protrusions at predetermined intervals on the upper part of the protrusions.

Further, in the present invention, the projections as a whole are arranged so as to alternately change direction in a substantially V-shape with respect to the longitudinal direction of the mold steel, and the total height of the projections and the ridges is 1.5~
In a preferred embodiment, the diameter is set to 4.0 mm.

Furthermore, in the present invention, a preferred embodiment is such that after forming the protrusions in the above method, both sides of the protrusions are pressed with rolls to increase the height of the protrusions, and then the protrusions are formed.

(Function) In the method of this invention, since the convex stripes formed on the side end faces of the shaped steel are thinner than the main body of the shaped steel, they easily receive deformation due to printing pressure.
A projection of sufficient height is formed by pressing the top surface of the cough ridge with a roll having an uneven peripheral surface.

Furthermore, if the height of the protrusions is increased by pressing both sides of the protrusions with rolls after forming the protrusions, the protrusions will become thinner, so that the next printing pressure of the uneven circumferential surface with the rolls will be lower. Pressure makes it possible to form higher protrusions.

Further, by arranging the protrusions in a substantially V-shape in alternating directions, it is possible to provide a slip prevention effect from all directions.

Furthermore, the total height of the protrusions and protrusions is 1.5 to 4,0
It has been found through experiments that the anti-slip effect is further improved by setting it to l-.

(Example) Hereinafter, the method of the present invention will be specifically explained based on illustrated examples.

1 to 4 show an example of a manufacturing process by hot rolling of the structural material 10 for IRM shown in FIGS. 5A to 5C.

First, in the first step shown in FIGS. 1A and 1B, a holding circumference 11a having a protrusion forming circumferential groove 1b at the groove bottom of the roll R1,
Between this and the holding circumferential groove 2a of the roll R2 facing this,
A mold 1110a having a rectangular cross section is inserted vertically with its main surface perpendicular to the roll axis direction, and pressure is applied in the width direction of the mold steel. Thereby, the shaped steel 10a becomes a shaped steel 10b having a protruding strip 11a having a height hl along the longitudinal direction on the side end surface on one end side in the width direction.

Next, in the second step shown in FIGS. 2A and 2B, rolls R of the same opposing circumferential surface have an annular recess 3c+4c between the narrow convex circumferential surfaces 3a and 4a and the wide convex circumferential surfaces 3b and 4b.
3 and R4, the mold 8m1Ob is horizontally shaped so that its main surface is parallel to the roll axis direction, and the convex strip 11a is a narrow convex circumferential surface part 3a.
, 4a, and apply pressure in the thickness direction. This mold! 110 b, the center portions of both main surfaces are compressed and converted into a 1-shape in cross section, and at the same time, the protruding strip 1
1a is compressed from its both sides, increasing its height to h2 and becoming thinner, resulting in a shaped steel 1OC having ridges 11b.

Subsequently, in the third step shown in FIG. 3A, a shaped steel 10c is inserted between the circumferential groove 5a of the roll R5 whose groove bottom is the uneven circumferential surface 5b and the holding circumferential groove 6a of the roll R6 facing the circumferential groove 5a. The first
Insert it vertically as in the process and apply pressure in the width direction. As a result, in the mold 1110c, the protruding stripes 11b are pressed by the uneven circumferential surface 5b of the roll R5, and the concave portions 5c of the cough circumferential surface 5b are pressed onto the upper part of the protruding stripes 11b.
The mold m1od has a protrusion 11C in which protrusions 12a are formed at constant pinch intervals corresponding to the above.

Finally, in the second stage shown in FIG. 4, the annular recess 7a,
Between the rolls R7 and 118 of the same opposing circumferential surface having wide convex circumferential surfaces 7c and 8c between 8a and 7b, the molded steel 1
As in the second step, 0d is made horizontal and inserted, and pressure is applied.

As a result, the mold $1110a is finished to a predetermined dimensional accuracy, and as shown in FIG. The structural material 10 for the groove cover is arranged with different positions.

The structural material for a gutter lid manufactured by the method of the present invention is not limited to one in which the main body portion has a single-shaped cross section, but may also be a structural material 13 in which the main body portion has a rectangular cross section as shown in FIGS. 6A and B.
In such a structural material 13, it is sufficient to use rolls R3, R4, R7, and R8 in the second step and the second step in which the contact portions with both main surfaces of the structural material 13 are flat surfaces. Alternatively, it is also possible to adopt a method in which a shaped steel having an I-shaped cross section is used in the step before the seventh step, and only the protrusions and protrusions are formed in the first to J steps. Therefore, in this invention, the operation of increasing the height of the protrusions in the second step can be omitted.

In addition, the height of the protrusion should be determined in accordance with 1. in order to obtain a sufficient slip prevention effect. The optimal range is about 0 to 2.51, especially 1.5±0.5, and the height of the convex ridges is 0.5 to 0.5.
It is preferable to set it to about 1.5. However, in order to adopt such a size range, the protrusion 11 in the second step of the surface layer
The height of b is about 2.5 to 3.5 m, especially 3.0 m
The pitch interval of the protrusions can be set in various ways, but it is preferably about 5 to 20 am based on the tire diameter of ordinary passenger cars, I/racks, etc. The shape of the protrusions should be flat. The shape is not limited to a parallelogram, but can be set to various shapes such as a square, an elongate, a circle, a triangle, and a trapezoid in plan view. On the other hand, it is preferable that the thickness of the structural material (cross section 1-shaped C is the thin part) is about 3 to 10 mm, and the width is about 25 to 100 mm.

Figures 7 to $9 show an example of a groove cover using the structural material 10 for groove cover obtained by the method of the present invention. It has a rectangular box shape, and is made of upright left and right short strips 14 made of ordinary shaped steel.
a and the front and rear long strips 14b, and between the front and front long strips 14b, 14b, there is a short structure in an upright state with the side end surface facing up and having a protrusion 11 and a protrusion 12. The structural members 10 are constructed parallel to each other at regular intervals by welding their ends, and a number of twisted wire rods 15 with a substantially square cross section perpendicular to the structural members 10 are welded at predetermined intervals by flash butt welding or the like. It is fixed between the upper edges of the IO to form a vertical and horizontal lattice.

In addition, in this usage example, as shown in FIGS. 7 and 9, the front and rear long strip plates 14b are replaced by the left and right short strip plates 14.
The vertical width is slightly shorter than that of a and the cross member lO, and a gap C is formed at the lower end, so that dust etc. can easily flow out from the gap C during use. Further, in terms of manufacturing, a step portion 16 is formed between the lower end portion of the long strip plate 14b and the structure element O1O, so that overlay welding can be performed reliably.

(Effects Unique to the Invention) According to the method of this invention, one end side in the width direction of the shaped steel 0IFII
Since a protrusion is provided on the end face and the protrusion is formed by applying pressure, even if the stamping force is small, the recess for forming the protrusion of the roll mold is sufficiently filled with the molded steel, which is the workpiece, and the desired height can be achieved. The protrusions can be formed, thereby making it possible to easily manufacture a rli-universal horizontal structural material having a high protrusion with a large anti-slip effect.

Furthermore, if the height of the ridges is increased by pressing both sides of the ridges with rolls after forming the ridges, there is an advantage that higher ridges can be formed in the next process with a lower impression pressure than ζ. be.

[Brief explanation of the drawing]

FIG. 1A is a perspective view of the first step in a fruitful example of the method of this invention, and FIG. 1B is a cross-sectional view of the printing pressure section of the same step. i42
Figure A is a perspective view of the second process, Figure 2B is a cross-sectional view of the printing pressure part in the same process, Figure 3A is a perspective view of the third process, and Figure 3B is the protrusion formation in the same process. 3C is a cross-sectional view taken along the mc-1TIC line in FIG. 3B, FIG. A plan view of the obtained structural material for groove lids, FIG. 5B is a front view thereof, FIG. 5C is a sectional view thereof, FIG. 6A is a front view showing another example of the structural material, and FIG. 6B is the same cross-sectional view, and Figure 7 uses the same structural material.
A perspective view of the R lid, Fig. 8 is a plan view of the main part of the rR'H, Fig. 9
The figure is a sectional view taken along the line IX--IX in FIG. 8, LO is a vertical sectional view showing the groove cover in an attached state, and FIG. 11 is an explanatory view of the conventional operation. R1...Roll having a circumferential groove, R3, R4...Roll that pinches the convex strip, R5...Roll having an uneven circumferential surface, lb...Circumferential groove, 5b...Uneven circumferential surface, 10 ... Structural material for groove cover, 10a to 10b ... Shape steel, 11.
lla, 1lb-・Protrusion, 12.12a...Protrusion.

Claims (1)

[Claims] 1. In hot rolling, the side end surface of either one or both ends in the width direction of a shaped steel having a rectangular or I-shaped cross section is pressed with a roll having a circumferential groove to form a shaped steel on the side end surface. A structural material for a groove cover, characterized in that a protrusion is formed along the longitudinal direction, and the top surface of the protrusion is pressed by a roll having an uneven peripheral surface to form protrusions at predetermined intervals on the upper part of the protrusion. manufacturing method. 2. The method for manufacturing a structural material for a groove cover according to claim 1, wherein the projections as a whole are arranged so as to alternately change direction in a substantially V-shape with respect to the longitudinal direction of the mold steel when viewed from above. 3. The total height of the protrusions and protrusions is 1.5 to 4.0 mm.
The method for manufacturing a structural material for a groove cover according to claim 1 or 2, wherein the structure is set as follows. 4. After forming the protrusions, both sides of the protrusions are pressed with rolls to increase the height of the protrusions, and then the protrusions are formed.Claim 1
4. The method for producing a structural material for a groove lid according to any one of 3 to 3.