JP5107800B2 - Guard fence support - Google Patents

Description

  The present invention relates to a guard fence post that supports a guard fence provided along a road.

  Conventionally, in order to ensure the safety of vehicles and pedestrians, protective fences are provided along the road. The protective fence is composed of a horizontal beam extending along the road and a protective fence column supporting the horizontal beam. The guard fence post is fixed to a concrete base embedded in the ground by a fastening member such as a bolt, for example. As the protective fence support, for example, a rectangular pipe having a rectangular cross section or a pillar portion having an H-shaped cross section is employed. Such guard fence posts need to meet official safety standards.

  By the way, in recent years, the replacement of old protective fences that have passed their useful lives has been promoted. Old protective fences are based on relatively loose safety standards several decades ago. In other words, the guard fence to be updated complies with the loose safety standards for the cross beams, guard fence posts, fastening members, and foundation. Therefore, along with the renewal of the protective fence, the setting of the protective fence based on strict safety standards in recent years is being advanced.

However, when a protective fence based on strict safety standards is installed, there is a problem that the strength of the foundation is insufficient. That is, when the foundation is reused, the strength of the foundation is insufficient even if the strength of the cross beam and the guard fence post is increased, and it is difficult for the guard fence as a whole to meet the safety standards. On the other hand, if all the foundation parts are dug up and the foundations are rebuilt in accordance with the renewal of the protective fence, there is a problem that a great amount of man-hours and costs are required.
JP 2007-270556 A

  Then, this invention is made | formed in view of said subject, The objective is to provide the protection fence support | pillar which satisfy | fills a safety standard, without updating a foundation.

  The invention according to claim 1 is a flat base portion fixed to a foundation, a flat front plate that stands up from one end side of the base portion, and stands up from the other end side of the base portion. A flat plate-shaped intermediate plate that is provided so as to rise from the hollow column portion and the base portion and connects the intermediate portion in the width direction of the front plate and the intermediate portion in the width direction of the column portion. And a guard fence post that supports the horizontal beam, wherein the pillar portion is hollow, thereby increasing the bending resistance force from the front plate side and reducing the maximum load. To do.

Thereby, the intensity | strength of the pillar part with respect to the load from the front board side becomes high. The hollow column portion has a high resistance to lateral deformation. Therefore, the load applied from the front plate side is applied to the rear without being released in the lateral direction by the hollow column portion. As a result, the protective fence post including the hollow column portion can cope with a large load as a whole. That is, it is possible to reduce the escape in a specific direction with respect to the load applied from the front, and the hollow column portion can effectively handle the applied load. When a load is applied, the front plate is deformed prior to the deformation of the column portion, and the load applied from the front plate side is reduced. As a result, the load applied to the base portion is relaxed. By reducing the load applied to the base portion, it is not required to improve the strength of the foundation. Therefore, safety standards can be met without updating the foundation.
In the invention according to claim 1, the column portion has an opening that communicates the inner side and the outer side on the front plate side at the end portion on the base portion side.
The hollow column portion is subjected to a surface treatment in order to prevent corrosion. In this case, the surface treatment is also applied to the inside of the hollow column portion. For example, when using plating etc., the plating solution with which the inside of the hollow pillar part was filled is discharged | emitted from an opening by providing an opening in a pillar part. As a result, the inside of the hollow column part can be surface-treated to prevent corrosion. Further, by providing an opening on the front plate side on the base portion side of the column portion, when a load is applied from the front plate side, the column portion is deformed in the vicinity of the opening having a low strength. Thereby, the load from the front plate side is also absorbed by the deformation of the column portion. Therefore, safety standards can be satisfied without updating the foundation, and corrosion of the pillars can be prevented.

According to a second aspect of the present invention, the cross section perpendicular to the axis of the pillar portion has a flat shape with a short direction connecting the front plate and the pillar portion.
Thereby, the intensity | strength of the column part with respect to the load from the front board side improves in shape. Therefore, the strength of the pillar portion can be increased with a simple structure.

According to a third aspect of the present invention, a cross section of the column portion is rectangular.
As a result, a generally rectangular and hollow member that is in circulation can be used as the column portion. Therefore, the strength of the column portion can be increased with a member having a simple structure that is easily available .

Hereinafter, a guard fence support according to an embodiment of the present invention will be described with reference to the drawings.
A guard fence post 10 according to an embodiment of the present invention shown in FIG. 1 supports a cross beam 11 provided along a road. In FIG. 1, the horizontal beam 11 is indicated by a two-dot chain imaginary line. The transverse beam 11 is composed of a large-diameter transverse beam 12 having a large diameter and two small-diameter transverse beams 13 and 14 having a small diameter provided below the large-diameter transverse beam 12. The protective fence post 10 is fixed to the foundation 16. The foundation 16 is constituted by, for example, a ground cover provided on a structure such as a bridge. The guard fence column 10 includes a base portion 21, a front plate 22, a column portion 23, and an intermediate plate 24. As shown in FIG. 2, the base portion 21 is formed in a rectangular plate shape corresponding to the shape of the base 16, for example. The base portion 21 may chamfer rectangular corner portions. The base portion 21 has a hole 25. As shown in FIG. 1, the bolt 17 provided on the base 16 penetrates the hole 25 of the base portion 21.

  The front plate 22 rises from the base portion 21. That is, the front plate 22 is provided so as to extend from the base portion 21 to the side opposite to the base 16. The front plate 22 and the base portion 21 are integrally connected by welding. The front plate 22 is made of a plate-shaped member, and has two bent portions 26 and 27 in the vicinity of the end portion on the base portion 21 side. The front plate 22 extends substantially upward from the base portion 21 to the bent portion 26, and the side opposite to the base portion 21 in the bent portion 26 is inclined toward the column portion 23 side. And the inclination to the pillar part 23 is gentler on the opposite side to the base part 21 than the bent part 27 of the front plate 22 than between the bent part 26 and the bent part 27. Thereby, the front plate 22 has a bent shape with the bent portion 26 and the bent portion 27 as a boundary.

  The column part 23 rises from the base part 21. That is, the column portion 23 is provided so as to extend from the base portion 21 to the side opposite to the foundation 16 in the same manner as the front plate 22. The column part 23 and the base part 21 are integrally connected by welding. As shown in FIG. 2, the column portion 23 is made of a hollow member unlike the front plate 22. The column part 23 is inclined slightly forward from the base part 21 to the tip.

  The middle plate 24 rises from the base portion 21 similarly to the front plate 22 and the column portion 23. That is, the middle plate 24 is provided so as to extend from the base portion 21 to the side opposite to the foundation 16 like the front plate 22 and the column portion 23. The middle plate 24 and the base portion 21 are integrally connected by welding. The middle plate 24 connects the front plate 22 and the column portion 23. Specifically, the intermediate plate 24 connects the width direction of the front plate 22, that is, the vicinity of the center in the width direction shown in FIG. The end of the middle plate 24 on the front plate 22 side is connected to the front plate 22 by welding. Moreover, the edge part by the side of the pillar part 23 of the intermediate plate 24 is connected with the pillar part 23 by welding. Thereby, the base part 21, the front board 22, the pillar part 23, and the intermediate | middle board 24 are all connected integrally by welding.

  The tips of the front plate 22 and the intermediate plate 24, that is, the end portion opposite to the base portion 21, has a support portion 31. The support portion 31 has a substantially arc shape in cross section. The support part 31 supports the cross beam 11 extending along the road. That is, the large-diameter transverse beam 12 constituting the transverse beam 11 is attached to the support portion 31. Further, the small-diameter horizontal beam 13 and the small-diameter horizontal beam 14 constituting the horizontal beam are attached to the front plate.

Next, the column portion 23 will be described in detail.
The column part 23 is formed from a hollow member as shown in FIG. 2, and the cross section is formed in a flat shape having a major axis and a minor axis. That is, the cross section of the column part 23 is longer in the direction perpendicular to the longitudinal direction shown in FIG. 2, that is, in the width direction shown in FIG. In the case of this embodiment, the cross section of the pillar part 23 is a rectangular shape whose minor axis is the front-rear direction. The cross section of the pillar portion 23 is not limited to a rectangular shape, and may have an arbitrary shape such as an oval or a polygon as long as it has a short axis along the front-rear direction shown in FIG.

As shown in FIG. 3, the column portion 23 has an opening 32 on the front plate 22 side at the end portion on the base portion 21 side. The opening 32 communicates the outside and the inside of the hollow column part 23. The base portion 21, the front plate 22, the column portion 23, and the intermediate plate 24 that constitute the protective fence column 10 are all formed of steel or the like. Therefore, the base portion 21, the front plate 22, the column portion 23, and the intermediate plate 24 are subjected to surface treatment for preventing corrosion of a plating layer or the like on the surface. Since the column part 23 is formed in the hollow, surface treatment is given also to the inner side. For example, when a surface treatment is performed by plating, a plating solution is also injected into the inside of the column portion 23. By forming the opening 32 at the end portion of the column portion 23 on the base portion 21 side, the plating solution injected into the inside of the column portion 23 flows out from the inside of the column portion 23 to the outside via the opening 32. Thereby, the column part 23 is reliably surface-treated not only on the outer side but also on the inner side, and the remaining of the plating solution or the like is prevented.
The protective fence post 10 is fixed to the foundation 16. The foundation 16 has a bolt 17 that rises upward. The bolt 17 is inserted into the hole 25 of the base portion 21. Then, the guard fence support 10 is fixed to the foundation 16 by tightening the nut 18 on the opposite side of the foundation 16 of the bolt 17.

Next, the intensity | strength of the protection fence support | pillar 10 by said structure is demonstrated.
In the guard fence column 10 according to the embodiment of the present invention, the base portion 21, the front plate 22, the column portion 23, and the intermediate plate 24 are all formed of steel (SS400). The base portion 21 has a plate thickness of 19 mm, a total length in the front-rear direction of 220 mm, and a total width in the left-right width direction of 125 mm. The total height from the lower end portion to the upper end portion of the protective fence post 10 is set to 850 mm. The front plate 22 is set to have a thickness of 6 mm, and is bent to the column portion 23 side by a bent portion 26 that is 60 mm above the lower end portion of the base portion 21. It is bent to the opposite side to the portion 23. The column part 23 is formed in a rectangular cylindrical shape having a total length of 20 mm in the front-rear direction and a total width of 40 mm in the left-right direction. Moreover, the plate | board thickness of the pillar part 23 is set to 3.2 mm. The total length in the front-rear direction of the middle plate 24 at the lower end portion on the base portion 21 side, that is, the space between the front plate 22 and the column portion 23 is set to 124 mm. The thickness of the intermediate plate 24 is set to 6 mm. The opening 32 provided at the end of the column part 23 on the base part 21 side has a width in the left-right direction set to 20 mm and a height set to 15 mm.

  FIG. 4 shows the result of a static load test performed on the protective fence column 10 under the above conditions. The static load test is based on the “protection fence installation standards and explanation” published by the Japan Road Association dated January 2008. As shown in FIG. 4, in the case of the guard fence post 10 of this embodiment, the maximum support force Pmax is Pmax = 25.20 kN, and the ultimate support force Pw is Pw = 2.06 kN. That is, it exceeds 21.9 kN, which is the lower limit value of the ultimate support force Pw, while reducing the maximum support force Pmax.

  For comparison, FIG. 6 shows the result of a static load test performed on the conventional protective fence post 100 shown in FIG. As shown in FIG. 5, in the conventional protective fence support 100, the front plate 101 has a substantially flat plate shape without a bent portion, and the column portion 102 is also formed in a plate shape. However, the column portion 102 has bent portions 104 and 105 in the vicinity of the end portion on the base portion 103 side. The front plate 101 and the column portion 102 are connected by an intermediate plate 106. Therefore, as shown in FIG. 5 (B), the cross section of the protective fence post 100 is substantially H-shaped. In the case of such a protective fence post 100, as shown in FIG. 6, the maximum support force Pmax is Pmax = 42.1 kN, and the ultimate support force Pw is Pw = 25.9 kN.

As described above, the guard fence column 10 according to the embodiment of the present invention is designed to ensure the ultimate support force while reducing the maximum support force as compared with the conventional guard fence column 100.
As described above, in one embodiment of the present invention, the strength of the column portion 23 with respect to the load from the front plate 22 side is increased. Since the front plate 22 has the bent portions 26 and 27, the bent portions 26 and 27 of the front plate 22 are deformed prior to the deformation of the column portion 23, and the load applied from the front plate 22 side is reduced. As a result, the load from the front plate 22 side is absorbed by the bending of the front plate 22, and the load applied to the base portion 103 is relaxed. By reducing the load applied to the base portion 103, the strength of the foundation 16 is not required to be improved. Therefore, it is possible to install a protective fence that satisfies the safety standards without updating the foundation 16.

Moreover, in one Embodiment of this invention, the cross-sectional shape of the pillar part 23 is made into the rectangular cylinder shape. Therefore, a rectangular and hollow member that is generally distributed can be used as the column portion 23. Therefore, the strength of the column portion 23 can be increased with a member having a simple structure that is easily available.
Furthermore, in one embodiment of the present invention, the hollow column portion 23 is subjected to a surface treatment in order to prevent corrosion. In this case, the surface treatment is also applied to the inside of the hollow column portion 23. For example, when utilizing plating etc., the plating solution with which the inner side of the hollow pillar part 23 was filled is discharged | emitted from the opening 32 by providing the opening 32 in the pillar part 23. FIG. Thereby, the inside of the hollow column part 23 can also be surface-treated to prevent corrosion. Further, by providing an opening on the front plate 22 side on the base portion 21 side of the column portion 23, when a load is applied from the front plate 22 side, the column portion 23 is deformed in the vicinity of the opening 32 having a low strength. Thereby, the load from the front plate 22 side is also absorbed by the deformation of the column part 23 near the opening 32. Therefore, safety standards can be satisfied without updating the foundation, and corrosion of the pillar portion 23 can be prevented.

  Moreover, the tolerance with respect to the deformation | transformation to a horizontal direction improves by applying a hollow member as the pillar part 23. FIG. Therefore, when a load is applied from the front on the front plate 22 side, the column portion 23 releases the load backward without releasing the load in the lateral direction. In particular, at this time, the rear wall surface located on the opposite side to the front plate 22 of the pillar portion 23 is bent in a state where the central portion is curved toward the front plate 22 side, that is, inward. Thereby, the tolerance of the pillar part 23 with respect to the load applied from the front improves, and it can receive a big load as a whole of the protection fence support | pillar 10. FIG. That is, by forming the column part 23 hollow, the escape of the load in a specific direction is reduced, and the column part 23 can effectively receive the load.

  Further, the load applied to the protective fence column 10 is absorbed by the buckling of the hollow column part 23 by, for example, securing a displacement of about several hundred mm rearward. The load is received not only by buckling of the column part 23 but also by bending of the rear wall surface of the column part 23 as described above. Since the column part 23 is hollow, it is thin and easily buckles. The resistance against the load from the front can be adjusted by the cross-sectional area of the column part 23 on the base part 21 side. Furthermore, this resistance also varies depending on the size and shape of the opening 32. Therefore, the resistance to the load from the front can be adjusted appropriately.

The load applied to the column portion 23 is received not only by buckling of the column portion 23 on the base portion 21 side but also by deformation of each surface of the column portion 23. Therefore, the column part 23 is extremely reduced in deformation in the lateral direction. As a result, the deformation of the column portion 23 can be concentrated in the vicinity of the bent portion 27 of the front plate 22.
By making the column part 23 hollow, the deformation in the lateral direction is reduced as described above. Moreover, weight reduction is easy by making the pillar part 23 hollow. And since the deformation | transformation to a horizontal direction is reduced by the hollow pillar part 23, and the deformation | transformation in the base part 21 side is promoted, the guard fence support | pillar 10 can be made into a slim shape. As a result, the protective fence column 10 can be reduced in weight and slimmed in shape, and the appearance can be improved.

The present invention described above is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof. For example, in the above-described embodiment, an example in which each part of the protective fence post 10 is formed of steel has been described. However, each part of the protective fence post 10 may be formed of other members such as stainless steel. Moreover, the hollow pillar part 23 demonstrated the example which has the opening 32 in the front board 22 side. However, you may provide in the surface on the opposite side to the front board 22 of the pillar part 23. FIG. However, providing the opening 32 on the front plate 22 side makes the opening 32 less noticeable and improves the aesthetics. Furthermore, the opening 32 may be configured to communicate with the inside of the hollow column portion 23 through a hole formed in the base portion 21. Thereby, the plating solution injected into the inner side of the column part 23 is discharged to the outside through the hole of the base part 21. Thus, when the opening 32 is not provided in the pillar part 23, the strength against deformation of the pillar part 23 is improved. Therefore, not only the size and shape of the opening 32 but also the presence or absence of the opening 32 can be used to adjust the strength against the load of the column portion 23.
Furthermore, in the embodiment of the present invention, the example in which the bent portions 26 and 27 are provided on the front plate 22 has been described. However, the front plate 22 may have a shape that rises linearly from the base portion 21 without bending.

Schematic which shows the side view of the protection fence support | pillar by one Embodiment of this invention Schematic showing a cross section taken along line II-II in FIG. (A) is the schematic which expanded the base part vicinity of the cross section in the III-III line of FIG. 2, (B) is the schematic which shows the cross section in the BB line of (A) Schematic which shows the static load test result of the protection fence support | pillar by one Embodiment of this invention. (A) is the schematic which shows the side view of the conventional protective fence support | pillar, (B) is the schematic which shows the cross section in the BB line of (A). Schematic showing the static load test results of a conventional protective fence post

Explanation of symbols

  In the drawings, 10 is a guard fence post, 11 is a cross beam, 16 is a foundation, 21 is a base portion, 22 is a front plate, 23 is a column portion, 24 is a middle plate, and 32 is an opening.

Claims (3)

A flat base portion fixed to the foundation;
A flat front plate that stands up from one end of the base portion; and
A hollow column provided to stand up from the other end of the base,
A flat plate-shaped intermediate plate that is provided to rise from the base portion and connects the intermediate portion in the width direction of the front plate and the intermediate portion in the width direction of the column portion,
A guard fence post that supports the cross beam,
The pillar portion, by a hollow, Ri can reduce der maximum load by increasing the bending resistance from the front plate side,
The pillar portion, safety barrier post, characterized in Rukoto that having a opening that communicates the inside and outside on the front plate side at the end of the base portion.   The protective fence post according to claim 1, wherein a cross section perpendicular to the axis of the pillar portion has a flat shape in which a direction connecting the front plate and the pillar portion is short.   The protective fence post according to claim 2, wherein a cross section of the pillar portion is rectangular.

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