JP2013112352A - Sleeper for loading heavy load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeper for loading a heavy load, that can improve the load bearing performance while attaining weight reduction.SOLUTION: The sleeper 10 for loading a heavy load that is molded of an extruded material of an aluminum alloy is formed of a pair of beltlike flat plates 11, 12 that are arranged oppositely to each other in the vertical direction, and of a perpendicular plate 13 that is arranged between these flat plate 11, 12 and connects each center in the width direction of these flat plate 11, 12, wherein both side surfaces of the connection part 14 between the flat plates 11, 12 and the perpendicular plate 13 are formed into a concave circular-arcuate shape, with the width W in a cross section surface being set smaller than the height H.

Description

  The present invention relates to a heavy load stacking sleeper used for heavy load storage and the like.

  A sleeper made of natural wood is known as a heavy loader sleeper. However, wooden sleepers are not only poor in handleability due to their heavy weight, but also have a problem in that the durability is not maintained for a long time due to deformation or breakage and the service life is short.

  Therefore, sleepers made of resin or metal have been used. For example, Patent Document 1 discloses a resin sleeper. This resin sleeper is composed of a molded body obtained by integrally extruding a pair of long high-strength plates and a plate-like connecting portion disposed between the high-strength plates. And the intensity | strength of a sleeper is improved by arrange | positioning a reinforcing material in the groove | channel or through-hole provided in the molded object.

  In addition, as disclosed in Patent Documents 2 to 4, many metal sleepers that use an aluminum alloy material for weight reduction have been proposed. These sleepers made of an aluminum alloy material have a square peripheral wall in the cross section, and a reinforcing wall that connects the opposing wall surfaces is formed at the center of each wall surface, and a cross section such as a square shape is provided. Since these sleepers are provided in a square shape, there is an advantage that there is no directionality at the time of installation and it is easy to use.

JP 2008-174947 A JP-A-8-119450 Japanese Utility Model Publication No. 2-70001 Utility model registration No. 3062267

  Resin sleepers are lightweight and excellent in handleability, but there is a concern about load bearing performance when placing heavy objects. Moreover, there exists a problem that it is inferior to a metal sleeper in environmental resistance performance, such as being easy to deteriorate by being exposed to external air. On the other hand, a square sleeper using an aluminum alloy material is superior in load bearing performance and environmental resistance as compared to a resin sleeper.

However, the sleepers of Patent Document 2 are used in truck beds, etc., and the sleepers of Patent Document 3 and Patent Document 4 are loaded with machinery that has been lifted with a jack or the like when transferring large machinery. It is used for mounting. That is, these sleepers all support the load for a short time, and are not intended to stably support for a long time.
Further, there is a demand for weight reduction in order to improve handling of heavy load-carrying sleepers, and even in lightweight sleepers, an improvement in load-bearing performance that can stably support heavy objects for a long period is required.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the heavy load mounting sleeper which can aim at weight reduction while being able to improve load bearing performance.

  The present invention is a heavy load mounting sleeper formed of an extruded material of an aluminum alloy, and a pair of strip-shaped flat plates arranged vertically opposite to each other, and the center portions in the width direction of the flat plates arranged between the flat plates. A vertical plate connecting the flat plate and the vertical plate, both side surfaces of the joint portion are formed in a concave arc shape, and the width W of the cross section is set to be smaller than the height H. Features.

The heavy load mounting sleeper of the present invention is formed of a pair of flat plates and a vertical plate, and even if the cross section thereof is set to be the same as the area of the sleeper having a rectangular shape by providing a hollow portion, The plate thickness of the vertical plate supporting the heavy object can be set larger than the plate thickness of the side plate in the square sleeper, and the rigidity against the load received from the upper surface can be set high.
In addition, in the case of a square sleeper, when a heavy object is placed so as to apply a load only to the end part of the upper surface, the heavy object must be supported only by the side plate arranged at the end part. On the other hand, in a sleeper formed of a pair of flat plates and a vertical plate, even when a heavy object is placed on the end of the upper surface, the heavy object can always be supported by the central vertical plate. Can be supported.
Furthermore, the stress concentration of a junction part can be reduced and bending rigidity can be improved by providing the both-sides surface of the junction part of a flat plate and a perpendicular board in a concave arc shape. Therefore, it is possible to improve the load bearing performance of the sleepers and to reduce the weight.

In addition, by setting the width W of the cross section of the sleeper to be smaller than the height H, the moment can be kept small even when a heavy object is placed so that a load is applied only to the end portion of the upper surface. In this case, the ratio H / W of the height H to the width W of the cross section is preferably set to 1.25 or more and 2.5 or less.
In addition, if the flat plate arrange | positioned up and down is provided in the same shape of the same width and the same board thickness, even when it installs by inverting the upper and lower arrangement | positioning, it can be used in the same state.

In the heavy load mounting sleeper of the present invention, the flat plate may be formed so that the thickness thereof increases from the side edge toward the center.
By increasing the thickness of the flat plate from the side edge toward the center, the deformation strength of the flat plate portion can be further increased. Further, the connection between the flat plate and the vertical plate is loosened, the stress concentration is reduced, and the bending rigidity can be further increased.

In the heavy load mounting sleeper according to the present invention, it is preferable that protruding ridges protruding inward in the vertical direction are formed on both side edges of the flat plate.
By providing the ridges, it is possible to prevent the sleepers from overlapping when a plurality of sleepers are stored close to each other. Moreover, when moving a sleeper, it becomes easy to hold | maintain with a protruding item | line part, and can handle it.

In the heavy load mounting sleeper of the present invention, a plurality of recesses extending in the length direction may be formed on the outer surface of the flat plate.
In this case, a concave portion is provided on the outer surface of the flat plate to add a non-slip function. In addition, by providing a recess, even when moisture adheres to the sleepers when exposed to rain, the moisture escapes from the recess, thus preventing moisture from adhering to a heavy object placed on a flat plate. be able to.

In the heavy load mounting sleeper of the present invention, it is preferable that both side surfaces of the joint portion are set in a concave arc shape having a radius of R10 mm to 20 mm.
As the radius R of both side surfaces of the joint between the flat plate and the vertical plate increases, the stress concentration at the joint is reduced, so that the bending rigidity can be increased. When the radius R is less than 10 mm, the required bending rigidity cannot be obtained. Further, when the radius R exceeds 20 mm, the bending rigidity can be increased, but this is not preferable because the joint portion becomes thick and the weight of the sleeper increases.

It is a perspective view which shows the sleeper for heavy article mounting of 1st Embodiment of this invention. It is a figure explaining the state which piled up the load using the heavy material mounting sleeper. It is a cross-sectional view of the heavy load mounting sleeper shown in FIG. It is a cross-sectional view which shows the sleeper for heavy article mounting of 2nd Embodiment of this invention. It is a cross-sectional view which shows the sleeper for heavy article mounting of 3rd Embodiment of this invention. It is a cross-sectional view which shows the sleeper for heavy article mounting of 4th Embodiment of this invention. It is a figure explaining the load load test of the sleeper for heavy article mounting.

Hereinafter, an embodiment of a heavy load mounting sleeper according to the present invention will be described with reference to the drawings.
The heavy load mounting sleeper 10 of the first embodiment (hereinafter simply referred to as sleeper) is used for placing a heavy load (aluminum alloy billet 20) as shown in FIG. By placing these sleepers 10 between the billets 20 and stacking the billets 20 via the sleepers 10, a plurality of billets 20 can be stored in a stacked state.

  The sleeper 10 is integrally formed by extrusion molding of an aluminum alloy. As shown in FIG. 1, the sleeper 10 is disposed between a pair of strip-like flat plates 11, 12 that are vertically opposed to each other and the flat plates 11, 12. , And a vertical plate 13 that connects the central portions in the width direction. The flat plates 11 and 12 respectively constitute the upper surface 11a and the lower surface 12a of the sleeper 10, and the outer surfaces are provided in parallel to each other. Further, both side surfaces of the joint portion 14 between the flat plates 11 and 12 and the vertical plate 13 are formed in a concave arc shape, and the concave arc-shaped surface is set to have a radius of R10 mm to 20 mm.

In the cross section of the sleeper 10, as shown in FIG. 3, the width W is set smaller than the height H, and the ratio H / W of the height H to the width W is 1.25 or more and 2.5. It is set as follows. Moreover, the flat plates 11 and 12 arrange | positioned up and down are provided in the same shape of the same width and the same board thickness, and can be used in the same state, even when installed upside down the sleeper 10 upside down. .
In addition, the material of the sleeper 10 can use aluminum of 6000 series alloy or 7000 series alloy in JIS specification, for example.

Thus, the sleeper 10 is formed of a pair of flat plates 11 and 12 and a vertical plate 13, and even if the cross section thereof is set to be the same as the area of the sleeper having a rectangular shape with a hollow portion, the sleeper 10 is vertical. The plate | board thickness of the vertical board 13 which supports a heavy article in a direction can be set larger than the board | plate thickness of the side board in a square sleeper, and the rigidity with respect to the load received from the upper surface 11a can be set highly.
In addition, in the case of a square sleeper, when a heavy object is placed so as to apply a load only to the end part of the upper surface, the heavy object must be supported only by the side plate arranged at the end part. On the other hand, in the sleeper 10 formed by the pair of flat plates 11 and 12 and the vertical plate 13, even when a heavy object is placed on the end of the upper surface 11a, the heavy object can always be supported by the central vertical plate 13. Therefore, a heavy object can be supported stably.
Furthermore, since the stress concentration of the joint part 14 is reduced by providing both side surfaces of the joint part 14 between the flat plates 11 and 12 and the vertical plate 13 in a concave arc shape, the bending rigidity can be increased. Therefore, the load bearing performance of the sleeper 10 can be improved and the weight can be reduced.

  In addition, by setting the width W of the cross section of the sleeper 10 to be smaller than the height H, a heavy object (the billet 20) is placed so that only the end of the upper surface 11a is loaded as shown by an arrow A in FIG. Even in such a case, the moment generated as shown by the arrow M can be kept small. In this case, the ratio H / W of the height H to the width W of the cross section is preferably set to 1.25 or more and 2.5 or less.

  Further, as the radius R of both side surfaces of the joint portion 14 between the flat plates 11 and 12 and the vertical plate 13 increases, the stress concentration of the joint portion 14 is reduced, so that the bending rigidity can be increased. When the radius R is less than 10 mm, the required bending rigidity cannot be obtained. Further, when the radius R exceeds 20 mm, the bending rigidity can be increased, but this is not preferable because the joint portion 14 becomes thick and the weight of the sleeper 10 increases.

FIG. 4 shows a heavy load mounting sleeper 30 according to the second embodiment of the present invention. The sleeper 30 of the second embodiment is formed such that the thickness of the pair of strip-shaped flat plates 11 and 12 that are opposed to each other in the vertical direction increases from the side edge toward the center. In this case, the inner surfaces located on the opposite side to the outer surfaces of the flat plates 11 and 12 (the upper surface 11a and the lower surface 12a of the sleeper 30) provided in parallel are provided on the inclined surfaces 11b and 12b.
The main configuration of the sleeper 30 is the same as that of the first embodiment, and the same reference numerals are given to the common parts with the first embodiment and the description thereof is omitted.
As described above, by providing the flat plates 11 and 12 with the thickness increasing from the side edge toward the center, the deformation strength of the flat plates 11 and 12 can be further increased. Further, the connection between the flat plates 11 and 12 and the joining portion 14 of the vertical plate 13 becomes loose, the stress concentration is reduced, and the bending rigidity can be further increased.

FIG. 5 shows a heavy load mounting sleeper 40 according to a third embodiment of the present invention. In the sleeper 40 of the third embodiment, the ridges 15 projecting inward in the vertical direction are formed on both side edges of the flat plates 11 and 12.
By providing the ridges 15, it is possible to prevent the sleepers 40 from overlapping each other when the plurality of sleepers 40 are stored close to each other. Moreover, when moving the sleeper 40, it becomes easy to hold | maintain with the protruding item | line 15 part, and can handle it.

FIG. 6 shows a heavy load mounting sleeper 50 according to a fourth embodiment of the present invention. In the sleeper 50 of the fourth embodiment, a plurality of recesses 16 extending in the length direction are formed on the outer surfaces of the flat plates 11 and 12 (the upper surface 11a and the lower surface 12a of the sleeper 50).
In this case, a recess 16 is provided on the upper surface 11a and the lower surface 12a of the sleeper 50 to add a non-slip function. In addition, by providing the concave portion 16, even when moisture adheres to the sleeper 50 due to rain or the like, moisture is released from the concave portion 16, so that moisture is placed on the heavy objects placed on the flat plates 11 and 12. Adhesion can be prevented.

Next, the load test performed about the heavy load mounting sleeper of this invention is demonstrated.
The sleepers 10 used for the test were produced using 7000 series alloy aluminum in JIS standards as the material. This sleeper 10 has been studied so as to be able to endure even when a heavy object of 100 kN (about 10 ton) is placed. In the reference numerals shown in FIGS. 1 and 3, the height H is 100 mm and the width W is 80 mm. , Length L: 1200 mm, plate thicknesses t1: 4 mm of the flat plates 11 and 12, and plate thickness t2 of the vertical plate 13: 12mm. Then, as shown in FIGS. 7A and 7B, stress generated in the sleeper 10 when the sleeper 10 is disposed between the billets 20 and the billet 20 is stacked via the sleeper 10. And strain were confirmed.

7A and 7B, the load on the sleeper 10 by the billet 20 is represented by arrows a1 to a3 and b1 to b3. The diameter D of the billet 20 on the upper surface 11a of the sleeper 10 is 228.6 mm. The load was applied at intervals of (9 inch), and the test was performed with a load of up to 30 kN (about 3 ton) per point of each arrow. In this case, a load-bearing performance of 20 kN or more is assumed for each point of each arrow.
The laminated state shown in FIG. 7 will be described. FIG. 7A shows a state where the contact positions of the upper surface 11a and the lower surface 12a of the sleeper 10 with the billet 20 are shifted by D / 2. b) shows a state in which the contact position of the billet 20 is placed on the upper surface 11a and the lower surface 12a of the sleeper 10 together.

  In the state where the contact position with the billet 20 shown in FIG. 7A is shifted by D / 2, a minute displacement was confirmed when a load up to 30 kN was applied, but no strain remained after the load was removed. The deformation was within the elastic range. In addition, when the contact positions shown in FIG. 7B were matched, a slight strain of about 0.01% was generated after removing the 30 kN load, but the amount of this strain is negligible. It has been found that it can sufficiently withstand use.

  In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, a various change can be added in the range which does not deviate from the meaning of this invention.

10, 30, 40, 50 Heavy goods loading sleepers 11, 12 Flat plate 11a Upper surface 12a Lower surface 11b, 12b Inclined surface 13 Vertical plate 14 Joint 15 Projection 16 Concave 20 Billet

Claims (5)

  A heavy load mounting sleeper formed of an extruded material of an aluminum alloy, and a pair of strip-shaped flat plates arranged vertically opposite to each other, and a vertical connection between the flat plates arranged between the flat plates. The weight is characterized in that the both side surfaces of the joint between the flat plate and the vertical plate are formed in a concave arc shape, and the width W of the cross section is set smaller than the height H. Sleepers for loading objects.   2. The heavy load mounting sleeper according to claim 1, wherein the thickness of the flat plate is formed so as to increase from the side edge toward the center.   The heavy load mounting sleeper according to claim 1 or 2, wherein ridges protruding inward in the vertical direction are formed on both side edges of the flat plate.   The heavy load mounting sleeper according to any one of claims 1 to 3, wherein a plurality of recesses extending in a length direction are formed on an outer surface of the flat plate.   5. The heavy load mounting sleeper according to claim 1, wherein both side surfaces of the joint portion are set in a concave arc shape having a radius of R10 mm or more and 20 mm or less.

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