JPH0519425Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention is a structural material for gutter covers, especially strips that are used in an upright state on at least one of the vertical and horizontal beams of a lattice-shaped gutter cover (generally referred to as grating in the industry). This invention relates to a structural material suitable as a plate. (Prior art) As shown in Fig. 10, when a gutter cover is attached to a road gutter or manhole A, the gutter cover B, which has a high load-bearing strength to allow the passage of automobiles, is made of an upright strip plate. A large number of short strip plates b are welded at both ends and installed in parallel between both long sides of a rectangular outer frame a, and a plurality of twisted wire rods (twist bars) c made of twisted wire rods having a substantially square cross section are installed as described above. Conventionally, grid-like structures have been commonly used, which are arranged parallel to the short strips in a direction perpendicular to the short strips and welded together. However, although shaped steel with a rectangular or I-shaped cross section is generally used for the above-mentioned short strips, since both surfaces of the short side of the cross section are flat,
The tires of automobiles passing over the groove cover using this structure tended to slip along the flat upper surface of the shaped steel, which was dangerous. Therefore, the inventor previously proposed a groove in which protrusions were formed at regular pitch intervals along the longitudinal direction on one surface of the short side of the cross section of a shaped steel having a rectangular or I-shaped cross section. We are proposing structural materials for lids. However, in a groove cover using the above-mentioned structural material with the protrusion side as the upper surface, the slip prevention effect in the longitudinal direction of the mold material is significantly improved compared to a general groove cover using a structural material without the protrusion. However,
Although the same effect in the direction oblique to the longitudinal direction is improved to some extent, it is not sufficient, and there is a problem that the anti-slip effect is highly directional. There is also a serrated grating in which half-moon-shaped recesses are formed in sequence at the upper end of the structural material, but the manufacturing method for this is to punch a steel mold to form a large number of half-moon-shaped recesses, so the bar is difficult to process. This has the disadvantage that it bends due to the impact and has to be re-molded, requiring an additional manufacturing process and therefore increasing costs. Additionally, since this serrated grating is punched to form recesses, the upper corners are sharp and can cause burrs, which can damage or even cut the tires of vehicles passing by. Smoothly processing these burrs and other areas becomes increasingly costly, and although serrated gratings have an anti-slip effect, they are expensive and have never been desirable. (Problems to be solved by the invention) This invention was devised to solve the above-mentioned conventional problems.It is easy to manufacture, and it provides an excellent anti-slip effect in all directions to the groove cover using this invention. The purpose of the present invention is to provide a structural material for groove lids that can be obtained. (Means for Solving the Problems) In other words, in order to achieve the above object, the structural material for a gutter cover according to this invention is made of a shaped steel having a rectangular or I-shaped cross section, and has a structure on one surface of the short side of the cross section. A protruding strip is formed along the longitudinal direction of the mold steel, and protrusions are formed at predetermined intervals on the protrusion, and these protrusions as a whole are diagonally intersecting each other in opposite directions with respect to the longitudinal direction of the mold steel when viewed from above. It has a configuration having side surfaces along the first and second directions. Therefore, in this invention, a preferred embodiment of the structural material is such that the total number of side surfaces along the first direction and the total number of side surfaces along the second direction of two adjacent protrusions are the same. Furthermore, in this invention, a preferred embodiment is such that the total height of the protrusions and the protrusions is 1.5 to 4.0 mm, of which the height of the protrusions is set to 1.0 mm or more. (Function) In the structural material for a groove cover of this invention, a large number of protrusions formed on one surface of the short side of the cross section of the mold steel are formed into diagonal projections that are obliquely oriented in opposite directions with respect to the longitudinal direction of the mold steel as a whole when viewed from above. Since it has side surfaces along the first and second directions, when it is used as a crosspiece of a lattice-shaped gutter cover with the side with the protrusions facing upward, it can be used not only in the vertical and horizontal directions of the gutter cover. In addition, the side surfaces in both directions form a sufficiently uneven surface even in all diagonal directions, and due to the large sliding resistance caused by these unevenness, a good anti-slip effect is achieved in all directions. do. In addition, since the above-mentioned protrusions are formed on the protrusions along the longitudinal direction of the mold steel, such protrusions are usually formed by imprinting with a roll having an uneven peripheral surface during hot rolling of the mold steel. The height of the protrusion can be set higher by providing in advance on the forming surface a protrusion that is narrow in width and is likely to be deformed by printing pressure. Moreover, as shown in claim 2, if the total number of side surfaces along the first direction and the total number of side surfaces along the second direction of two adjacent protrusions are set to be the same, both the overall groove cover and the local The side surfaces in both directions are equally present, and the directional presence of the anti-slip effect is partially or almost completely eliminated. (Example) This invention will be explained below based on the illustrated example. The structural material 1a for a groove lid shown in FIGS. 1A to 1C includes a shaped steel 2a having an I-shaped cross section, and a convex strip 3 along the longitudinal direction of the shaped steel is formed on one surface of the short side of the cross section.
Parallelogram-shaped protrusions 4a in plan view are provided on the protrusions 3 at constant pitch intervals. Therefore, these protrusions 4a have a shape in which two opposing sides of a parallelogram are oblique to the longitudinal direction of the shaped steel, and the oblique directions of the two oblique sides of the adjacent protrusions 4a, 4a are The two adjacent protrusions 4a, 4a have side surfaces 5a in a first direction oblique to the longitudinal direction and side surfaces 5a in a second direction opposite to each other. 5b are present in the same number. The groove cover structural material 1b shown in FIGS. 2A and 2B has protrusions 3 and protrusions 4a similar to those of the structural material 1a formed on one surface of the short side of the cross section of a steel mold 2b having a rectangular cross section. It is something that On the other hand, both of the above-mentioned structural members 1a and 1b have a protrusion 4a that is a parallelogram in plan view, but in this invention, the shape of the protrusion is not limited, and the protrusion as a whole has the above-mentioned first shape. Any shape and arrangement may be used as long as the side surface 5a in the direction and the side surface 5b in the second direction can be formed. For example, as shown in FIGS. 3A and 3B, a structural material 1c in which triangular projections 4b are alternately arranged in opposite directions, and as shown in FIGS. Structural material 1d arranged in the opposite direction,
As shown in FIG. 5A and B, the protrusion 4 has a trapezoidal shape in plan view.
Even if it is a structural material 1e etc. in which c is arranged in the same direction,
The side surfaces 5a and 5b in both directions can be configured. In addition, in the above embodiment, the height of the protruding strip 3 is 0.5
〜1.5mm protrusion 4a formed on the protrusion 3〜
The height of 4c is about 1.0 to 2.5 mm, especially a range of 1.5±0.5 mm is optimal. Although the pitch of the protrusions can be set in various ways, it is preferably about 5 to 20 mm based on the diameter of tires of ordinary passenger cars and trucks.
On the other hand, the thickness (shaped steel 2a
The thick part) is about 3 to 10 mm, and the width is 25 to 100 mm.
It is good to have something of a certain degree. According to the embodiment of the present invention, by first forming the protruding strip 3 and forming the protrusions 4a to 4c thereon, the recesses for forming the protrusions of the roll die are sufficiently filled with the molded steel, which is the workpiece. This makes it possible to form protrusions of sufficient height. On the other hand, when the protrusion is formed directly on the end face of the molded steel without having a protrusion,
There is a possibility that the recesses for forming protrusions of the roll die are not sufficiently filled with the mold steel, which is the workpiece (this is generally referred to as sinking), and it may not be possible to form protrusions of sufficient height. FIG. 6 shows an example of a groove cover using the structural material 1 for groove cover according to this invention. As shown in the figure, this groove cover has a rectangular box shape with a grid-like main surface.
Upright left and right short strips 6a made of ordinary shaped steel
and front and rear long strip plates 6b, and between the front and front long strip plates 6b, a short structural member 1 in an upright state with the side end surface having the protrusion 4 facing upward is welded at both ends. are constructed in parallel at regular intervals,
A plurality of twisted wire rods 7 having a substantially square cross section orthogonal to the structural member 1 are fixed at predetermined intervals between the upper edges of the structural member 1 by flash butt welding or the like to form a vertical and horizontal lattice. In this embodiment, the front and rear long strips 6b are formed to have a slightly shorter vertical width than the left and right short strips 6a and the structural member 1, so that a gap C is formed at the lower end. This makes it easier for dust and the like to flow out from the gap C during use, and also for manufacturing purposes, there is a step 18 between the lower end of the long strip plate 6b and the structural member 1.
is formed so that overlay welding can be performed reliably. Note that, contrary to the above, the structural member 1 of this invention can be used as a crosspiece in the longitudinal direction of a gutter cover, or can be used as a crosspiece in both vertical and horizontal directions. Next, we will examine the results of a slip resistance test on a groove lid I constructed using the structural material of this invention as shown in Fig. 6, and a lid groove similarly constructed using a structural material made of ordinary shaped steel without protrusions. explain. (1) Dimensions of the entire gutter cover...995 x 400 x 50mm (2) Structural materials Gutter cover (structural material 1a with the configuration shown in Figure 1) Shaped steel 2a...thickness 5.0mm, width 50mm Convex strip 3... Height: 1.0 mm, Width: 3.4 mm Protrusion 4a: Height: 1.2 mm, Pitch: 12 mm, Oblique angle of oblique side surface relative to the longitudinal direction of the mold steel: approx.
60° Gutter cover: Made of the same type of steel as the groove cover, without protrusions or protrusions (3) Test method (a) Human body load assumption test As shown in Figure 7, the ground surface for human feet is 10 x 30 cm and the bottom surface. The ballast 8b is loaded on the loading plate 8 to which the rubber plate 8a is attached, and the total weight is set to 60 kg, and this is placed on the groove cover or on top, and the spring weigher 9
By pulling it through S, shown in FIG.
The slip resistance in each direction of L ₁ , L ₂ , and 45° was measured in the dry state and in the wet state with water sprayed. In addition, in the _L1 direction, the slip between wire rods 7 and 7,
The _L2 direction is the slip on the wire 7. The results are shown in Table 1. (b) Automobile load test As shown in Figure 8, groove covers or slip-prevention anchors 11 are placed under both front wheels of an ordinary passenger car 10.
At the same time, both rear wheels are placed on the lift-up vehicle 13 placed on the surface where the zinc plate 12 is laid and floated, and in this state, the column 14 and the vehicle 10 are connected via the chain block 15 and the load cell 16. By connecting the wheels with wire rope 17 and pulling the car 10 with chain block 15, S,
The slip resistance in each direction of L ₁ and L ₂ was measured in both wet and dry conditions. The results are shown in Table 2. In the table, "initial stage" refers to the resistance at the time of starting, and "middle period" refers to the resistance during sliding.

【table】

[Table] From the results in Tables 1 and 2, the gutter cover 1 using the structural material of this invention shows a good slip prevention effect averaged in all directions including diagonal directions in both wet and dry conditions, and is particularly effective against automobiles. It is clear that the anti-slip effect is much better than that of conventional general-purpose groove covers. (Effect unique to the invention) In the groove cover structural material of this invention, a large number of protrusions formed on one surface of the short side of the cross section of the mold steel are obliquely oriented in opposite directions with respect to the longitudinal direction of the mold steel as a whole when viewed from above. Since it has side surfaces along the first and second directions, by using it as a material for forming a lattice, it is possible to provide a groove cover that has a good slip prevention effect in all directions including diagonal directions. Furthermore, it has the same anti-slip effect as serrated grating, and can be obtained at low cost and without any danger. In addition, according to this invention, since the protrusion is formed on a convex shape along the longitudinal direction of the mold steel, the height of the protrusion can be made even higher due to the manufacturing method, thereby preventing slippage. It has the advantage of having a greater effect. Further, as shown in claim 2, if the total number of side surfaces in both directions of the two adjacent protrusions is set to be the same, the directional dependence of the slip prevention effect of the provided groove cover can be localized as a whole. has the advantage of being almost completely eliminated.

[Brief explanation of the drawing]

FIG. 1A is a plan view of the first embodiment of the structural material for a groove cover of this invention, FIG. 1B is a front view of the same, FIG. 1C is a sectional view of the same, and FIG. 2A is a second embodiment of the same structural material. front view,
Figure 2B is the same sectional view, Figure 3A is the third cross-sectional view of the same structural material.
A plan view of the embodiment, FIG. 3B is a front view of the same, FIG. 4A
is a plan view of a fourth embodiment of the same structural material, FIG. 4B is a front view of the same, FIG. 5A is a plan view of a fifth embodiment of the same structural material, FIG. 5B is a front view of the same, and FIG. The figure is a perspective view of a groove cover using the same structural material, Figures 7 and 8 are schematic side views illustrating the sliding load test method for the groove cover, and Figure 9
The figure is a plan view showing the tensile direction of the above test.
FIG. 0 is a longitudinal sectional view showing the installed state of the groove cover. 1, 1a to 1e... Structural material for groove lid, 2a, 2b
...Shaped steel, 3...Convex strip, 4a to 4c...Protrusion,
5a...Side surface in the first direction, 5b...Side surface in the second direction.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a shaped steel with a rectangular or I-shaped cross section, protrusions extending along the longitudinal direction of the shaped steel are formed on one surface of the short side of the cross section, and a predetermined interval is formed on the protruding strips. 1. A structural material for a groove cover, comprising a structure in which projections are formed, and the projections as a whole have side surfaces along first and second directions that are opposite to each other and diagonally intersect with respect to the longitudinal direction of the mold steel in plan view. (2) The structural material for a groove lid according to claim 1, wherein the total number of side surfaces along the first direction and the total number of side surfaces along the second direction of the two adjacent protrusions are the same. (3) The total height of the protrusion and protrusion is 1.5 to 4.0 mm.
The structural material for a groove cover according to claim 1 or 2, wherein the height of the protrusion is set to 1.0 mm or more.