JPS6312992B2 - - Google Patents

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 angle θ of both side surfaces of the protrusion and the front and rear surfaces in the rolling direction is smaller than 90°, and it is difficult to even set it to 60° or more.

When concrete is laid on such a steel material with protrusions, the angle of inclination of the protrusions is smaller than 90°, so the protrusions have the effect of restraining the concrete against vibrations in the left and right directions, but they have the effect of restraining the concrete against vibrations in the vertical direction. Since there is no restraining effect, there is a concern that the concrete will easily peel off. Therefore, it is necessary to weld a large number of stud dowels, each of which has an offset head like a bolt, to the surface of such a steel material 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> The present invention was proposed in view of the above circumstances, and its purpose is to provide a steel material with protrusions and a steel material with significantly increased adhesion performance to plastic materials such as concrete and which can completely eliminate stud dowels. The object of the present invention is to provide a rolling method that can relatively easily manufacture such steel materials.

<Structure of the Invention> The steel material with projections according to the present invention includes projections integrally protruding from the surface of the steel material, consisting of high projections and low projections located alternately and continuously in the axial direction of the material,
The low protrusion is configured such that its head width is larger than its base width, thereby greatly increasing its adhesion performance to concrete and the like.

The method for rolling a steel material with protrusions according to the present invention is such that, in an intermediate rolling process in hot rolling of a steel material, protrusions are formed on at least one surface of the rolled material, extending in the rolling direction and having multiple stripes in the width direction. A protrusion having a notch groove at the center in the width direction is formed, 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 a low protrusion with a head width larger than the base width is formed. This method is designed to obtain steel materials 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 in hot rolling of steel materials, at least one surface of the rolled material 1 is provided with multiple strips extending in the rolling direction and in the widthwise center of the head. A protrusion 3 having a deep wedge-shaped V-notch groove 2 is formed in one pass or in 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 have any shape that widens upward, such as a U-shape.

Next, the subsequent mill has a spline-shaped roll 4 as shown in FIG. 3, and the multi-striped ridge 3 is intermittently rolled down in the rolling direction by such a roll 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.
A and 5B are formed alternately and continuously in the material axis direction.

The low protrusion 5B is connected to the notch groove 2 as shown in FIG.
is pushed out, creating a shape similar to a stud dowel in which the width of the head is larger than the width of the base, which prevents the concrete from peeling off due to vertical vibration.

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 and maintains the same height as the protrusion 3, as shown in FIG. Furthermore, the inclination angle before and after the rolling direction, ′, is
Because the material is less advanced, it can be made more than 60°.

<Specific Example> This specific example is an example in which striped protrusions are formed on H-beam steel of H500 x 200 x 10/16. FIG. 8 shows an example of a mill layout for manufacturing such H-shaped steel with striped protrusions, and shows, in order from the heating furnace 6, a double breakdown mill (hereinafter referred to as BD mill) 7, a rough universal mill ( There are 8 UR mills, 9 double edger mills (E mills), and 10 finishing universal mills (UF mills).

First, a slab is heated in a heating furnace 6 to a predetermined temperature of 1200° C. or higher, and then formed into a beam blank in a BD mill 7. Next, this beam blank is subjected to multiple passes of reverse rolling in an intermediate rolling mill group consisting of UR mill 8 and E mill 9.
Two protrusions 3 are formed on the outer surface of the flange of the rolled material.

As shown in Fig. 9 and Fig. 10, the horizontal roll of UR mill 8 and the E mill 9 are normal rolls.
A groove corresponding to the protrusion 3 is formed on the vertical roll of the UR mill 8.

Fig. 11 shows the details of the protrusion 3 formed by the intermediate rolling mill group, w = 30 mm, d = 15 mm, θ
= 85°, l = 14mm, h = 7mm.

Next, such a steel material is processed in the UF mill 10 so that the rolled length in the rolling direction is 30 mm, the unrolled length is 10 mm, the thickness of the high protrusion 5A is 16 + 12 = 28 mm, the thickness of the low protrusion 5B is 16 + 6 = 22 mm, The thickness of the part without protrusions shall be 16 mm. On the other hand, the web thickness was also 10 as specified.
mm, and an H-beam steel is obtained in which a low protrusion 5B with an anchor effect and a high protrusion 5A without an anchor effect are mixed (see FIG. 12).

<Effects of the invention> As mentioned above, the steel material with projections according to the present invention has the following effects:
The integrally projecting protrusions are composed of high protrusions and low protrusions that are arranged alternately and continuously in the axial direction of the material, and the low protrusions are arranged such that the head width thereof is larger than the base width. Because of this structure, the adhesion performance with concrete etc. is increased, and it can exhibit almost the same anchoring effect as conventional stud dowels, and the 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 configuration.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional striped section steel, Fig. 2 is a perspective view showing a rolled material of an intermediate rolling mill according to the present invention, and Fig. 3 is a perspective view showing a spline roll of a UF mill. 4 is a perspective view showing a section steel with projections according to the present invention, FIG. 5 is a cross-sectional view showing low projections, and FIGS. 6 and 7 are cross-sectional views showing high projections. Fig. 8 is a schematic diagram showing the mill layout of H-section steel with protrusions, Fig. 9 is a longitudinal sectional view, and Fig. 1
Fig. 0 is a front view showing the UR mill E mill, Fig. 11 is a cross-sectional view showing details of the protrusion, and Fig. 12 is a perspective view showing the H-section steel with protrusions. 1...Rolled material, 2...Notch groove, 3...Protrusion,
4...Spline-shaped roll, 5A...High protrusion,
5B...Low protrusion, 6...Heating furnace, 7...BD mill, 8...UR mill, 9...E mill, 10...
UF mill.

Claims (1)

[Scope of 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 include high protrusions and A steel material with a protrusion, comprising a low protrusion, the low protrusion having a head width larger than a base width. 2. In the intermediate rolling process in hot rolling of steel materials, at least one surface of the rolled material is provided with protrusions that extend in the rolling direction, are multi-striped in the width direction, and have a notched groove in the center of the head in the width direction. 1. A method for rolling a steel material with protrusions, the method comprising: forming the protrusions, and then rolling the front and rear protrusions intermittently in the rolling direction to the bottom of the notched groove in a subsequent mill.