JPH09250115A - Beam for guard rail and production method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the appearance, by forming the width part of the crest and the trough of a rail with a corrugated section to have mutually reverse taper from one end thereof to the other end. SOLUTION: A beam 3 for a guard rail is alternately provided with two crests 3A in the axial direction and one trough 3B and also provided with bolt holes 4A, 4B at both ends. In this time, the width of the crest 3A is continuously widened from one end thereof to the other end and the width of the trough 3B is continuously narrowed from one end to the other end. The bolt hole 4A of one end is made laterally long and the bolt hole 4B of the other end is made vertically long to absorb the fitting error at the connecting process of the rail. The beams 3 are mutually bolted in the same direction and the flat parts of the crest 3A and the through 3B at the superposed part thereof are closely positioned and hence, any clearances are not brought and the bolt holes coincide with each other. In this way, a level difference at the superposed part can be prevented and further, the appearance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guardrail beam and a method and apparatus for manufacturing the same, and in particular, when a guardrail is constructed, a step other than the step due to the thickness of the beam does not occur in the beam overlapping portion. The present invention relates to a beam for a guardrail having an excellent appearance, and a method and an apparatus capable of easily manufacturing such a beam.

[0002]

2. Description of the Related Art In a guardrail consisting of columns and a beam fixed between the columns, the beams are connected to each other in the longitudinal direction by overlapping the ends of the columns with each other and bolting the overlapping portions. ing. However, since the cross-sectional shape of the beam 1 is the same in the beam longitudinal direction, as shown in FIG. 12, the flat portions A of the peaks and valleys in the overlapping portion do not come into close contact with each other, and a gap ( S) occurs. Moreover, since the flat portion A of the beam 1 does not come into close contact with each other, the positions of the bolt holes 2 formed in the sloping portions B of the peaks and the valleys in the overlapping portion are displaced and the portions do not overlap.

When a gap (S) is formed in the flat portion A of the overlapping portion of the beam 1 as described above, a step more than the plate thickness of the beam 1 is generated in the overlapping portion and the appearance is deteriorated. Moreover,
If the bolt holes 2 formed in the inclined portion B do not match, it is difficult to insert the bolts into the bolt holes 2 and it takes time to construct the guardrail.

A beam for a guardrail which solves the above-mentioned problems is shown in Japanese Utility Model Publication No. 25022 of 7th Kaihei. As shown in FIG. 13, this guardrail beam has peaks and troughs alternately formed in the width direction, so that one overlapping portion C of the beam 1 does not have a gap (S) in this portion. It has been corrected to a perfect shape. Hereinafter, this guardrail beam is referred to as a stepped beam. According to the stepped beam,
No step is formed in the overlapping portion C due to the gap (S).

[0005]

However, the above-mentioned stepped beam has the following problems. Since it is necessary to correct one overlapping portion of the beam 1 so that no gap is formed in this portion, the number of beam forming steps is increased.

Since one overlapping portion of the beam 1 is corrected so that no gap is formed in this portion, a step D due to the correction occurs in the overlapping portion of the beam, and the appearance is poor. Therefore, it is an object of the present invention to
There is no need to correct so that there is no gap in this part,
Therefore, it is an object of the present invention to provide a beam for a guardrail having an excellent aesthetic appearance, in which a step due to correction is not generated in a beam overlapping portion, and a method and a device capable of easily manufacturing such a beam.

[0007]

According to the first aspect of the present invention,
In a guardrail beam having a corrugated cross section in which peaks and valleys are alternately formed in the width direction, and bolt holes are formed at both ends, the width of the peaks is continuous from one end to the other end. Widely formed, the width of the valley portion adjacent to the peak portion,
It is characterized in that it is continuously narrowed from the one end to the other end.

According to a second aspect of the present invention, there is provided a press working machine having a punching means and a bending means for forming an original plate of a beam for a guardrail having a corrugated cross section in which peaks and valleys are alternately formed in a width direction. It is carried into the perforating means to form bolt holes at both ends of the original plate, and then the perforated original plate having the bolt holes formed at both ends in this way is transferred to the bending means to perform the perforating operation. The original plate is bent into a corrugated cross section,
Then, when the perforated original plate is bent and formed by the bending means, a new guardrail beam original plate is carried into the perforated means, and the perforated original plate is bent and formed at the same time. It is characterized by forming bolt holes at both ends of the original plate.

According to a third aspect of the present invention, there is provided a lower die, an upper die capable of moving up and down with respect to the lower die, a punching means provided between the lower die and the upper die, and the lower die. Between the upper die and the upper die, the bending means is provided adjacent to the punching means, and the punching means comprises a punching die provided in the lower die and a lower surface of the upper die. The forming means includes a punching punch fixed to the lower die, and the bending means includes a corrugated forming die provided on the lower die, and a main punch and a leading punch provided on a lower surface of the upper die. It consists of a corrugated punch that matches the die,
The preceding punch is characterized in that it is formed prior to forming the main punch.

According to a fourth aspect of the present invention, there is provided a lower die, an upper die capable of moving up and down with respect to the lower die, a punching means provided between the lower die and the upper die, and the lower die. Between the upper die and the upper die, the bending means is provided adjacent to the punching means, and the punching means comprises a punching die provided in the lower die and a lower surface of the upper die. A punching punch fixed to, and a stripper attached to the lower surface of the upper die, for removing the punching original plate from the punching punch when the punching punch is raised, the bending means, The corrugated forming die provided on the lower die, and the main punch and the leading punch provided on the lower surface of the upper die, consisting of a corrugated punch that matches the forming die, the leading punch, Prior to forming the main punch Those having features to be molded Te.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a guardrail beam of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a guardrail beam according to the present invention, FIG. 2 is a front view showing the guardrail beam according to the present invention, and FIG. 3 is a right side view showing the guardrail beam according to the present invention. Fig. 5 is a left side view showing a beam for a guardrail of the present invention, Fig. 5 is a front view showing a guardrail constructed by the beam of the present invention as seen from the roadway side, and Fig. 6 is a sectional view taken along line AA of Fig. 5. is there.

As shown in FIGS. 1 to 6, the guardrail beam 3 of the present invention has two peaks 3A and 1 in the width direction.
Three valleys 3B are formed alternately, and bolt holes 4 are formed at both ends.
It is a beam having a corrugated cross section in which A and 4B are formed, and the width (L1) of the mountain portion 3A is continuously wide from one end (the left end in FIG. 2) to the other end (the right end in FIG. 2). The width (L2) of the valley portion 3B adjacent to the peak portion 3A is formed to be continuously narrow from the one end to the other end. That is, the widths of the peak portion 3A and the valley portion 3B change in a taper shape. It should be noted that the bolt hole 4A at one end is formed in a horizontally long shape so as to absorb a mounting error, and the bolt hole 4B at the other end is formed in a vertically long shape.

If the beams 3 having the tapered widths of the peaks 3A and the valleys 3B are bolted to each other in the same direction, as shown in FIG. 6, the peaks in the overlapping portions of the beams 3 are formed. 3A and the flat portion A of the valley portion 3B are in close contact with each other, no gap is formed in the overlapping portion, and the bolt holes 4 are aligned.

Next, a method of manufacturing the above-described guardrail beam 3 of the present invention will be described with reference to the drawings. FIG. 7 is a front view showing an apparatus for manufacturing the guardrail beam 3 of the present invention, FIG. 8 is a sectional view showing a perforated original plate, FIG. 9 is a sectional view showing a semi-finished product beam, and FIG. 10 is a product beam. FIG. 11 is a plan view showing a lower die of the guardrail beam manufacturing apparatus of the present invention.

7 to 11, 5 is a lower die, and 6
Is an upper die that can be moved up and down with respect to the lower die 5 via the guide post 7, 8 is a hole forming means provided between the lower die 5 and the upper die 6, and 9 is the lower die 5. Between the upper mold 6,
The bending means is provided adjacent to the punching means 8.

The perforating means 8 is attached to the lower surface of the upper die 6 and the plurality of perforating punches 11 fixed to the lower surface of the upper die 6, the perforating die 10 provided in the lower die 5. It comprises a stripper 13 for separating the punching base plate 12 from the punching punch 11 when the punching punch 11 is raised. Prior to punching by the punch 11, the stripper 13 presses the beam original plate 12A onto the punching die 10 by the elastic force of the spring 14, and after the punching is completed, the spring 14 is lifted even when the punching punch 11 is raised. Has the effect of pressing the perforated original plate 12B by the elastic force of, and thus reliably separating the perforated original plate 12B from the perforated punch 11. Reference numeral 15 is a positioning pin for the original plate 12A provided on the upper mold 6.

The folding means 9 includes a corrugated forming die 16 provided on the lower die 5 and a corrugated punch 17 provided on the lower surface of the upper die 6 and conforming to the forming die 16.
It consists of The corrugated punch 17 is composed of a main punch 18 and a preceding punch 20 that can move up and down independently of the main punch 18 by a preceding cylinder 19 with respect to the main punch 18.

According to the present invention having the above structure,
A method of manufacturing the guardrail beam by the guardrail beam manufacturing apparatus will be described. First, the beam original plate 12A is placed on the punching die 10 of the punching means 8. The original plate 12A has a dimensional difference in width between one end and the other end due to corrugation, but in consideration of this dimensional difference,
A trapezoidal original plate having different widths at one end and the other end may be used. Next, the upper mold 6 is lowered. With this, the original plate 1
Bolt holes 4A and 4B are formed at both ends of 2A. After punching, the upper die 6 is raised in preparation for the next punching. At this time, the action of the stripper 13 causes the punching original plate 12B.
Does not rise together with the punch 11 for punching.

Next, in this way, the bolt holes 4 are formed at both ends.
The perforated original plate 12B on which A and 4B are formed is transferred onto the forming die 16 of the bending means 9. On the other hand, the next new original plate 12A is placed on the punching die 10. Next, with the preceding punch 19 projecting the preceding punch 20 from the main punch 18 by a predetermined dimension, the upper die 6 is lowered until the tip of the preceding punch 20 contacts the upper surface of the perforated original plate 12B. Next, the preceding punch 20 is lowered together with the upper die 6 by the preceding cylinder 19 while counteracting the compression force of the pressure molding. As a result, the valley portion 3B is formed in the central portion of the punched original plate 12B. Next, the semi-finished product beam 12 having the valleys 3B formed in this way
Further, the main punch 18 is lowered together with the upper die 6 on C. At this time, the leading cylinder 19 moves to the main punch 18
Retracts while succumbing to the pressure (pressure of the entire device). As a result, the product beam 12D is formed. After that, the product beam 12D is transported to the next step such as painting.

Simultaneously with the lowering of the main punch 18, the new original plate 12A on the perforating die 10 is perforated, so that the upper die 6 is lowered once to perform the perforating and bending of each original plate. Can be done at the same time.

In the above-described embodiment, the gas cylinder or the pneumatic cylinder is used as the preceding cylinder 19, but a hydraulic cylinder may be used, and similar functions and effects can be obtained by controlling the hydraulic pressure. Further, instead of the preceding cylinder 19, a coil spring having a predetermined strength or urethane rubber having a predetermined hardness may be used.

[0023]

As described above, according to the present invention, in a beam for a guardrail having a corrugated cross section in which peaks and valleys are alternately formed in the width direction and bolt holes are formed at both ends, The width of the peak portion is continuously wide from one end to the other end, and the width of the valley portion adjacent to the peak portion is continuously narrow from the one end to the other end. As a result, there is no step in the overlapping portion of the beams, and it is possible to obtain a guardrail beam having an excellent appearance. Moreover, by providing the lower die having the same upper die with the hole forming means and the bending means, it is possible to perform the hole forming and the bending forming of each original plate at the same time by the lowering of the upper die once, which is a useful effect. Be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a guardrail beam of the present invention.

FIG. 2 is a front view showing a guardrail beam of the present invention.

FIG. 3 is a right side view showing the guardrail beam of the present invention.

FIG. 4 is a left side view showing the guardrail beam of the present invention.

FIG. 5 is a front view showing a guardrail constructed by the beam of the present invention as seen from the roadway side.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a front view showing an apparatus for manufacturing a guardrail beam 3 according to the present invention.

FIG. 8 is a cross-sectional view showing a perforated original plate.

FIG. 9 is a cross-sectional view showing a semi-finished product beam.

FIG. 10 is a cross-sectional view showing a product beam.

FIG. 11 is a plan view showing a lower mold of the guardrail beam manufacturing apparatus of the present invention.

FIG. 12 is a cross-sectional view showing a superposed portion of a conventional guardrail beam.

FIG. 13 is a partially omitted front view showing a conventional guardrail beam.

[Explanation of symbols]

 1: Beam 2: Bolt Hole 3: Beam for Guardrail of the Invention 3A: Mountain Part 3B: Valley Part 4A: Bolt Hole 4B: Bolt Hole 5: Lower Mold 6: Upper Mold 7: Guide Post 8: Drilling Means 9: Bending means 10: Drilling die 11: Drilling punch 12A: Raw plate 12B: Drilling original plate 12C: Semi-finished product beam 12D: Product beam 13: Stripper 14: Spring 15: Pin 16: Forming die 17: Punch 18: Main punch 19: Leading cylinder 20: Leading punch

Claims (4)

[Claims] 1. A guardrail beam having a corrugated cross section in which peaks and valleys are alternately formed in the width direction and bolt holes are formed at both ends, wherein the width of the peaks is from one end to the other end. A beam for a guardrail, characterized in that the width of the valley portion that is continuously formed wide across and adjacent to the peak portion is formed narrower continuously over the one end to the other end. 2. An original plate of a beam for a guardrail having a corrugated cross section in which peaks and valleys are alternately formed in the width direction is carried into the punching means of a press machine having a punching means and a bending means. Then, bolt holes are formed at both ends of the original plate, and then the perforated original plate having the bolt holes formed at both ends is transferred to the bending means to make the perforated original plate into a corrugated sectional shape. When bending and shaping the perforated original plate by the folding means, when a new original plate of the guardrail beam is carried into the perforating means, the perforated original plate is bent and formed. At the same time, bolt holes are formed at both ends of the new original plate. 3. A lower die, an upper die that can be moved up and down with respect to the lower die, a punching means provided between the lower die and the upper die, and the lower die and the upper die. Between the hole forming means and a bending means provided adjacent to the hole forming means, and the hole forming means includes a hole forming die provided in the lower mold and a hole forming device fixed to a lower surface of the upper mold. The bending means comprises a punch, and the bending means includes a corrugated forming die provided on the lower die, and a main punch and a preceding punch provided on a lower surface of the upper die, and the corrugated die conforms to the forming die. An apparatus for manufacturing a beam for a guardrail, comprising a shape punch, and the preceding punch is formed prior to forming the main punch. 4. A lower die, an upper die that can be moved up and down with respect to the lower die, a punching means provided between the lower die and the upper die, and the lower die and the upper die. Between the hole forming means and a bending means provided adjacent to the hole forming means, and the hole forming means includes a hole forming die provided in the lower mold and a hole forming device fixed to a lower surface of the upper mold. A punch and a stripper attached to the lower surface of the upper die for separating the punching plate from the punching punch when the punching punch moves up; and the bending means is provided in the lower die. A corrugated forming die, and a corrugated punch that matches the forming die, consisting of a main punch and a preceding punch provided on the lower surface of the upper die,
The manufacturing apparatus for a guardrail beam, wherein the preceding punch is formed prior to forming the main punch.