JPS59224754A - Steel material with projection and rolling thereof - 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 steel material with protrusions, such as a striped H-beam steel, used as a composite member with a plastic material such as concrete or mortar, and a method for rolling the same. It is something.

<Prior Art> Generally, in steel materials having projections, the projections are formed by groove rolling in the final pass of hot rolling. Therefore,
As shown in Fig. 1, the inclination angles θ and ψ of both side surfaces of the protrusion and the front and rear surfaces in the rolling direction are smaller than 90° and 60°.
It is difficult to even achieve the above.

When concrete is laid on such a steel material with protrusions,
Since the angle of inclination of the protrusion is smaller than 90°, the protrusion has the effect of restraining the concrete against vibrations in the left and right directions, but has no restraint effect against vibrations in the vertical direction, so the concrete easily peels off. I'm worried about it getting stored away. Therefore, it is necessary to weld a large number of stud dowels with upside-down heads like bolts to the surface of such steel materials for reinforcement. In other words, with the conventional protrusion shape, there was no anchor effect, and it was difficult to completely eliminate stud dowels.

<Purpose of the Invention> This invention was proposed in view of the above circumstances, and its purpose is to provide a steel material with protrusions that greatly increases adhesion performance with plastic materials such as concrete and can completely eliminate stud dowels. Another object of the present invention is to provide a rolling method that can relatively easily manufacture such steel materials.

<Structure of the Invention> The protrusion-equipped steel material according to the present invention consists of protrusions integrally protruding from the surface of the steel material, consisting of high protrusions and low protrusions located alternately and continuously in the axial direction of the material. The protrusions are configured so that the width of the protrusions is wider than the width of the head or base, and the adhesion performance with concrete etc. is greatly increased.

The method for rolling a steel material with protrusions according to the present invention includes, in an intermediate rolling step in hot rolling of a steel material, protrusions extending in the rolling direction on at least one surface of the rolled material and having multiple protrusions in the width direction;
A protrusion having a notch groove is formed at the center in the width direction of the head, and then, in a subsequent mill, the protrusion is rolled down intermittently in the rolling direction to the bottom of the notch groove, so that the width of the head is wider than the width of the base. This is to obtain a steel material in which large low protrusions are located intermittently.

<Example> The present invention will be described below based on an illustrative example. As shown in FIG. 2, in the intermediate rolling process during hot rolling of steel materials, at least one surface of the rolled material 1 is provided with multiple stripes extending in the rolling direction, having multiple stripes in the width direction, and having a width of the head. A protrusion 3 having a deep wedge-shaped V-notch groove 2 in the center of the direction is formed by one pass or multiple passes. Here, the angle of inclination of both side surfaces of the protrusion 3 is smaller than 90° because of groove rolling. Note that although the notched groove 2 is V-shaped, it is not limited to this, and may be any shape that widens upward, such as a U-shape.

Next, the subsequent mill has spline-shaped rolls 4 as shown in FIG. 5, and the multi-striped ridges 6 are intermittently rolled down in the rolling direction by such rolls 4. The amount of reduction of the part to be rolled down at this time is preferably up to the depth of the notch groove 2. As shown in FIG. are formed alternately and continuously in the direction of the material axis.

As shown in Fig. 5, the low protrusion 5B has a shape similar to a stud dowel in which the notch groove 2 is expanded and the width of the head is larger than the width of the base. can be prevented.

On the other hand, since the high protrusion 5A has only a small portion to be rolled down, it has substantially the same cross-sectional shape as the protrusion 3, as shown in FIG. 6, and also maintains the same height as the protrusion 3. Furthermore, the inclination angle ψ before and after the rolling direction.

ψ1 can be set to 60·0 or more because the material is less advanced.

Specific Example> This specific example is an example in which striped protrusions are formed on H-beam steel of H3O0X200X10/16. Figure 8 shows an example of a mill layout for manufacturing such H-section steel with striped protrusions, in which a double breakdown mill (
(hereinafter referred to as BD mill) 71 Rough Universal Mill (hereinafter referred to as UR
mill) 8, double edger mill (hereinafter referred to as E mill) 9,
A finishing universal mill (hereinafter referred to as UF mill) 10 is installed.

First, the slab is heated in a heating furnace 6 to a predetermined temperature of 1200° C. or higher, and then molded into a BD::1 rank. Next, this beam blank t-
Multiple passes of reverse rolling are performed in an intermediate rolling mill group consisting of a UR mill 8 and an E mill 9 to form two protrusions 3 on the outer surface of the flange of the rolled material.

As shown in FIGS. 9 and 10, the horizontal roll of the UR mill 8 and the E mill 9 are normal rolls, but grooves corresponding to the protrusions 3 are formed on the vertical roll of the UR mill 8. .

Figure 11 shows the protrusions 3 formed by the intermediate rolling mill group.
details, w = 30iIl, d = 15k, θ
=85°, 1=14wx, h=7 in order.

Next, such a steel material is processed in the UF mill 10 so that the rolled length in the rolling direction is 60 mm, the unrolled length is 10 mm, the thickness of the high protrusion 5A is 16 + 12; 28 mm, and the thickness of the low protrusion 5B is 16 + 6. = 22 mm, and the thickness of the part without protrusions is 16 mm. On the other hand, the web thickness is also set to a predetermined value (#) 10+++m, with low protrusions 5B having an anchor effect and high protrusions 5A not having an anchor effect.
(See Figure 12) 0〈
Effects of the Invention> As described above, the steel material with projections according to the present invention includes integrally projecting projections consisting of high projections and low projections located alternately and continuously in the axial direction of the material. Because the low protrusion is configured so that its head width is larger than its base width,
It has improved adhesion performance with concrete, etc., and can exhibit almost the same anchoring effect as conventional stud dowels.
Stud dowels that were welded to the steel surface can be completely eliminated.
It can significantly reduce man-hours in construction and civil engineering work.

Further, according to the rolling method of the present invention, a steel material with projections having the above-mentioned advantages can be easily produced with a relatively simple structure.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional striped section, and Fig. 2 is a perspective view showing a conventional striped section steel.
FIG. 5 is a perspective view showing a rolled material in a group of intermediate rolling mills according to the present invention, FIG. 5 is a perspective view showing a spline-shaped roll of UF Nil, and FIG. , Fig. 5 is a cross-sectional view showing a low protrusion, Fig. 6 and Fig. 7 are a cross-sectional view and a vertical cross-sectional view showing a high protrusion, and Fig. 8 is a mill layout of an H-section steel with a protrusion. Schematic diagram, Figure 9, 1st
Figure 0 is a front view of the UR Mill K mill, Figure 11 is a
FIG. 12 is a cross-sectional view showing details of the protrusion, and a perspective view showing the H-section steel with a protrusion. 1. Rolled material, 2. Notched groove, 3. Projection, 4. Spline roll, 5A.. High projection, 5B.. Low projection, 6.. Heating furnace, 7.. BD mill. 8. , UR Mill, 9
．． , Fi Mill, 10. -UF Mill.

Claims (2)

[Claims] (1) A steel material for composite structure with a plastic material having protrusions integrally protruding from the surface of the steel material, wherein the protrusions are composed of high protrusions and low protrusions located alternately and continuously in the axial direction of the material. A steel material with a protrusion, wherein the low protrusion has a head width larger than a base width. (2) In the intermediate rolling process in hot rolling of steel materials, on at least one surface of the rolled material, extending in the rolling direction,
Forming a protrusion that is multi-striped in the width direction and having a notched groove at the center of the head in the width direction, and then rolling the front and rear protrusions intermittently in the rolling direction to the bottom of the notched groove in a subsequent mill. A method of rolling protrusions versus copper side′ characterized by the following.