JP2017036631A - Tool for preventing buckling of marker post - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for preventing buckling of a marker post, which makes the marker post gently curved without the occurrence of local buckling when the marker post is bent due to the collision or contact of a vehicle.SOLUTION: A tool 10 for preventing buckling of a marker post is installed on a base of the erect marker post 20, and installed in the state of closely adhering to a ground surface or having a part of a bottom buried in the ground surface. The tool has a through-hole 10a into which the marker post 20 is to be inserted. Its cross-section assumes a shape in which geometrical moment of inertia with respect to the central axis of the through-hole decreases upward from a ground surface position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sign post buckling prevention device for preventing local buckling from occurring at the base when a road sign post is bent due to a collision or contact of an automobile or the like.

  Currently, many signposts and mirror installation pillars are installed on the side of the road. However, these marker pillars and mirror installation pillars are often bent by a collision with an automobile or the like. In this case, local buckling often occurs at the root, and repair work is being performed with a sign raising machine, etc., but if a fallen sign pillar is raised with a sign raising machine, the sign pillar will crack. There is. In order to remove the danger, if the sign post is broken and a new sign post or a mirror installation post is installed again, many costs are required. FIG. 6 shows a state in which the marker column is bent. FIG. 6A is a side view of the bent marker column 20, and FIG. 6B is a perspective view of the bent marker column 20. As is clear from these figures, it can be seen that local buckling occurs at the local buckling point 20a at a position slightly elevated from the ground G.

  Further, for example, Patent Document 1 discloses a technique related to a road sign column having a pole that bends due to contact or collision with a vehicle or the like without losing the function as a gaze guidance sign by contact or collision with an automobile or the like. . The road sign pillar of patent document 1 is demonstrated below, referring FIG.

  As shown in FIG. 7, the road sign post 80 of Patent Document 1 includes a pole 60, a receiving body 100, and a base 70 as main components. A reflection plate 67 is wound around the pole 60. Further, a hole 90 is dug in the ground, and after the anchor member 82 is inserted into the hole 90, the adhesive 91 is filled, and the anchor member 82 is buried and fixed in the ground. And after installing the base 70, the receiving body 100, and the pole 60 sequentially from the lower side, the fastening member 81 is screwed into the anchor member 82, and the road sign pillar 80 is completed. The head 62 of the pole 60 has a through hole 64, and a tool for fastening the fastening member 81 passes through the through hole 64. After the installation work of the road sign pillar 80 is completed, the through hole 64 is closed with the cap 65. Since the receiving body 100 absorbs an impact applied to the base 70 when the road sign pillar 80 is bent and does not damage them, the receiving body 100 has excellent durability.

Japanese Patent Laid-Open No. 11-140832

  However, the above-described road sign post 80 is a sign post used for a center line of a roadway, a lane change line, a separation zone, etc., and has a different structure from a sign post or a mirror installation post installed on a side of the road. . As a result, when the base 70 or the receiving body 100 is used for a sign post or a mirror installation post installed on the side of the road, the cost increases, and the receiving body 100 cannot sufficiently absorb the impact of a car or the like. There are challenges.

  The present invention has been made to solve the above-described problems, and provides a marker column buckling prevention tool that does not generate local buckling when the marker column is bent by a collision or contact of a vehicle, and that gently bends. The purpose is to do.

  The present invention has the following configuration in order to solve the above problems.

(1) A sign pole buckling prevention device installed at the base of an upright sign pillar and installed in close contact with the ground surface or with part of the bottom buried in the ground surface,
Having a through hole into which the marker column is inserted;
The marker column buckling prevention device characterized in that the cross-sectional shape is a shape in which the cross-sectional secondary moment with respect to the central axis of the through hole decreases from the position of the ground surface upward.

  (2) The sign pillar buckling prevention tool according to (1), wherein an upper end surface of the sign pillar buckling prevention tool is fixed to the sign pillar.

  (3) The sign pillar buckling according to (1) or (2) above, wherein a waterproof sealing material is installed between the top of the sign pillar buckling prevention tool and the sign pillar. Prevention tool.

  (4) The sign pillar buckling prevention device according to any one of (1) to (3), wherein the external shape is a trapezoidal shape.

  (5) The marker column buckling prevention device according to (4), wherein a plurality of disk-like lateral ribs or a spiral groove is provided in the axial direction.

  (6) The marker column buckling prevention device according to (4), wherein the marker column buckling prevention device has a plurality of radial vertical ribs.

  (7) The marker column buckling prevention device according to (5) or (6) above, which has an animal repellent in an internal space.

  (8) The sign pole buckling prevention device according to (4), wherein the trapezoidal shaped bus is a curved line that protrudes downward.

  (9) The marker pillar buckling prevention device is configured by a plurality of members, and the plurality of members are coupled by a fastening means, according to any one of (1) to (8), Sign pillar buckling prevention tool.

  ADVANTAGE OF THE INVENTION According to this invention, when a marker pillar is bent by the collision and contact of a vehicle, the marker pillar buckling prevention tool which does not generate local buckling and becomes a gentle curve can be provided.

The perspective view which shows the structure of the marker pillar buckling prevention tool of an Example. The figure which shows the other structure of the label | marker pillar buckling prevention tool of an Example. The figure which shows the structure of the label | marker pillar buckling prevention tool of the division structure of an Example. The figure for demonstrating the cross-sectional secondary moment of the marker pillar buckling prevention tool of an Example. The figure which shows the bending state of the sign pillar which installed the sign pillar buckling prevention tool of an Example The figure which shows the buckling state of the conventional sign pillar The figure which shows the structure of other conventional road sign pillars

  Embodiments for carrying out the present invention will be described below with reference to the drawings.

  The structure of the marker column buckling prevention device of the present invention will be described with reference to FIG. FIG. 1A shows a state in which the marker column buckling prevention device 10 is installed on a conventional marker column 20. The sign post buckling prevention tool 10 has a truncated cone shape, and a through hole 10a is provided in the center of the sign post. The sign post buckling prevention device 10 is installed in the base end of the sign post 20 near the ground G after being inserted into the sign post 20 in advance. The boundary line between the marker column buckling prevention tool 10 and the marker column 20 at the top is fixed by welding W or the like. The welding W in this case may be several point weldings. Moreover, the structure which press-fits the marking pillar 20 to the insertion hole 10a of the marking pillar buckling prevention tool 10 may be sufficient. The bottom surface of the sign post buckling prevention tool 10 is in contact with the ground G. The sign pillar buckling prevention device 10 of the present invention has a function of dispersing the impact received by the sign pillar 20, and as a result, local buckling that occurs near the ground G of the sign pillar 20 can be prevented.

  Moreover, as shown in FIG.1 (b), the structure which has the O-ring 17 inside the mark column buckling prevention tool 10 in the vicinity of the top part may be sufficient. Thus, if rain water can be prevented from entering between the sign pillar buckling prevention tool 10 and the sign pillar 20, the progress of corrosion of the sign pillar buckling prevention tool 10 and the sign pillar 20 can be suppressed. .

  FIG. 2 is a view showing marker pillar buckling prevention tools of various shapes. FIG. 2A shows the Mt. Fuji-type marker column buckling prevention tool 11 whose slope is a gentle curve. That is, the marker column buckling prevention tool 11 has a truncated cone shape in which the bus bar 11a is a gentle convex curve. FIG. 2 (b) shows the frustoconical marker column buckling prevention tool 10 already shown in FIG. FIG. 2 (c) shows the sign pillar buckling prevention device 12 having a bamboo shoot shape inside. In other words, the marker column buckling prevention device 12 has a plurality of disc-shaped lateral ribs 12a with the insides thereof removed. FIG. 2D shows a sign pillar buckling prevention tool 13 having a conical shape inside. That is, the marker column buckling prevention tool 13 has a spiral groove 13a in the axial direction. Thus, the weight of the sign pole buckling prevention tool can be reduced by making the inside a bamboo shoot shape and a snail shape. Moreover, FIG.2 (e) is the label | marker pillar buckling prevention tool 14 which has the radial vertical rib 14a inside. It is a shape that takes into account the production of a sign post buckling prevention device by die casting or the like.

  In addition, the bamboo shoot-shaped sign pillar buckling prevention tool 12, the snail-shaped sign pillar buckling prevention tool 13, and the sign pillar buckling prevention tool 14 having vertical ribs have a space inside, but dogs and cats dislike this space. It is possible to inject the animal repellent S and prevent corrosion of dogs and cats by urine. Moreover, the progress of the rust of a marker pillar buckling prevention tool can be prevented by making the material of the various marker pillar buckling prevention tool already mentioned stainless steel.

  FIG. 3 shows a split-type marker column buckling prevention tool 15 having a split structure, FIG. 3 (a) shows an assembled state, and FIG. 3 (b) shows a state after the assembly is completed. This split type marker column buckling prevention tool 15 is composed of two parts 15a and 15b. The component 15 a has a mounting hole 16, and the component 15 b has a tap 18. This split-type sign post buckling prevention tool 15 is convenient when reinforcing the sign post 20 already installed on the side of the road. That is, the components 15a and 15b may be combined so as to sandwich the existing marker column 20, and the screws 31 may be fastened and fixed as illustrated.

  Next, the cross-sectional secondary moment in a state where the marker column buckling prevention device of the present invention is installed on the marker column will be described in comparison with a conventional marker column alone. The value of the cross-sectional second moment has a great influence on the occurrence of the buckling of the marker column.

FIG. 4 (a ₁ ) is a graph showing the cross-sectional secondary moment I regarding the Z axis of the conventional marker column 20 shown in FIG. 4 (a ₂ ). In FIG. 4 (a ₂ ), the coordinate axes X and Y orthogonal to the ground G are taken, and the central axis of the marker column 20 in the vertical direction is taken as the Z axis. As can be seen from the graph of FIG. 4A ₁ , the cross-sectional secondary moment I is infinite at the height of the ground (H = 0), and the marker column 20 has a constant value at any height H. That is, it can be seen that the cross-sectional secondary moment I changes abruptly at the connection point between the marker column 20 and the ground G (A in FIG. 4 (a ₁ )). As described above, the local buckling already occurs in the vicinity of the ground G due to the abrupt change of the cross-sectional secondary moment I.

FIG. 4 (b ₁ ) is a graph showing the cross-sectional secondary moment I with respect to the Z axis of the marker column 20 provided with the marker column buckling prevention device 10 shown in FIG. 4 (b ₂ ). The coordinate axes in FIG. 4 (b ₂ ) were set in the same manner as in FIG. 4 (a ₂ ). As can be seen from the graph of FIG. 4 (b ₁ ), the sectional secondary moment I is infinite at the ground position (H = 0), and the height (H ) Increases gradually, and the cross-sectional secondary moment I becomes a constant value at a position equal to or higher than the height H _{1 of} the marker column buckling prevention device 10. As described above, by installing the marker column buckling prevention device 10 on the marker column 20, the secondary moment I of the cross section can be gradually decreased from the position of the ground G. It can be absorbed and local buckling of the marker column 20 can be prevented.

  FIG. 5A is a diagram showing a state after a load (moment M) is applied to the marker column 20 on which the marker column buckling prevention device 10 is installed due to a collision of a vehicle or the like and is deformed. It can be seen that the energy due to the collision of the vehicle or the like is absorbed by both the deformation of the sign column 20 and the deformation of the sign column buckling prevention device 10. In FIG. 5A, F1 and F2 indicate the force acting between the marker column 20 and the marker column buckling prevention device 10, and F3 indicates the force acting between the marker column buckling prevention device 10 and the ground G. . As can be seen from this figure, the marker column 20 is not locally buckled near the ground G. That is, from this state, the bent marker column 20 can be raised by a marker raising machine or the like, and there is no need to cut and replace the marker column 20. FIG. 5B shows a state where the skirt portion of the sign post buckling prevention tool 10 is buried in the ground G and installed. F4 and F5 indicate the force acting between the marker column 20 and the marker column buckling prevention device 10, and F6 and F7 indicate the force acting between the marker column buckling prevention device 10 and the ground G. As can be seen from this figure, when the skirt portion of the sign pillar buckling prevention device 10 is buried in the ground G, the sign pillar buckling prevention device 10 is more firmly fixed to the ground G, and the buckling of the sign pillar 20 is further reduced. It can be completely prevented.

  According to the present embodiment, it is possible to provide a marker column buckling prevention tool that does not cause local buckling when the marker column is bent by a collision or contact with a vehicle, and that is gently bent.

10 Marking Column Buckling Prevention Tool 11 Mt. Fuji-type Marking Column Buckling Prevention Tool 12 Bamboo-Shaped Marking Column Buckling Prevention Tool 13 Snail-shaped Marking Column Buckling Prevention Tool 14 Marking Column Buckling Prevention Tool 14a with Vertical Ribs Ribs 15 Split-type marker pillar buckling prevention tool 15a, 15b Parts 16 Mounting hole 17 O-ring 18 Tap 20 Marker pillar 31 Screw G Ground S Animal repellent W Welded part

(1) A part of it is buried in the ground, installed at the base of a metal sign pillar that is installed upright on the ground surface, and is in close contact with the ground surface or part of the bottom is buried in the ground surface. A sign pillar buckling prevention device to be installed,
Having a through hole into which the marker column is inserted;
The marker column buckling prevention device characterized in that the cross-sectional shape is a shape in which the cross-sectional secondary moment with respect to the central axis of the through hole gradually decreases from the position on the ground surface.

Claims (9)

A sign pole buckling prevention device installed at the base of an upright sign pillar and installed in close contact with the ground surface or with part of the bottom buried in the ground surface,
Having a through hole into which the marker column is inserted;
The marker column buckling prevention device characterized in that the cross-sectional shape is a shape in which the cross-sectional secondary moment with respect to the central axis of the through hole decreases from the position of the ground surface upward.   The sign pillar buckling prevention tool according to claim 1, wherein an upper end surface of the sign pillar buckling prevention tool is fixed to the sign pillar.   The sign post buckling prevention device according to claim 1, wherein a waterproof sealing material is installed between the top of the sign post buckling prevention tool and the sign post.   The sign pillar buckling prevention device according to any one of claims 1 to 3, wherein the appearance shape is a trapezoidal shape.   5. The marker column buckling prevention device according to claim 4, wherein the marker column buckling prevention device has a plurality of disc-shaped lateral ribs or a spiral groove in the axial direction.   The sign pillar buckling prevention tool according to claim 4, wherein the sign pillar buckling prevention tool has a plurality of radial vertical ribs.   The marker column buckling prevention device according to claim 5 or 6, wherein the marker column buckling prevention device has an animal repellent in an internal space.   5. The marker column buckling prevention tool according to claim 4, wherein the trapezoidal shaped bus bar is a curved line projecting downward.   The sign post buckling prevention device according to any one of claims 1 to 8, wherein the sign post buckling prevention device includes a plurality of members, and the plurality of members are coupled by a fastening unit. .

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