JP2008144475A - Fixing structure of protective fence prop on covered ground part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a protective fence prop on a covered ground part capable of preventing a protruding end of an anchor bolt from being fractured and preventing occurrence of unnecessary wavering of a protective fence. <P>SOLUTION: The protective fence prop 10 is firmly fixed on the covered ground part G by fastening an anchor nut 42 tightly by preventing a supporting fitting 1 from being deformed when fastening the anchor nut 42 tightly by a horizontal part 12 and a straight erected part 11 of the supporting fitting 1 to prevent occurrence of unnecessary wavering of the protective fence 100. However, since the horizontal part 11 and/or the straight erected part 12 are deformed if the load being almost equal to the load fracturing the protruding end 41 of the anchor bolt is applied to the supporting fitting 1, it is possible to prevent the anchor bolt from being fractured when a vehicle collides against the protective fence 100. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for fixing a guard fence post to a ground covering portion in a guard fence in which a horizontal beam or a panel is attached between pillars fixed to the ground surface.

  In a protective fence attached with a horizontal beam or panel between the columns, the horizontal beam and the protective column column will be deformed when an external force is applied to the protective column, but in order not to overturn the protective column column, It is necessary to firmly fix the lower end portion to the ground cover. In such a fixing, a guard plate is provided by providing a base plate at the lower end of the guard fence post, inserting an anchor bolt previously embedded in the ground cover portion into the through hole of the base plate, screwing an anchor nut, and tightening. Can be securely fixed to the ground cover, and the work related to the installation of the protective fence can be simplified. However, with the recent improvement in performance of automobiles, etc., there has been a demand for an improvement in strength that can resist the external force at the time of collision for existing guard fences. With regard to the protective fence, it is possible to improve the strength relatively easily by replacing it with a material with a large wall thickness or adding a member, but the anchor bolt is embedded in the ground cover using concrete or the like. Therefore, it is difficult to increase the shear strength of the anchor bolt, and when only the strength of the protective fence is increased, there is a high possibility that the anchor bolt will be cut when the vehicle collides.

  Therefore, in order to reduce the load acting on the anchor bolt, for example, the protruding end of the anchor bolt with the main body embedded in the ground cover portion is inserted and protruded through the support base of the protective fence column, and the protruding end has a buffering function having an interference function. A structure for fixing a guard fence column and a ground cover portion configured to fix the column by screwing a nut through a body is disclosed (for example, Patent Document 1).

Microfilm of Japanese Utility Model No. 59-150028 (Japanese Utility Model Application No. 61-68115)

  However, in the conventional structure for fixing the guard fence post to the ground covering portion as described in Patent Document 1, it is a shock absorber having a shock absorbing function that is interposed between the anchor nut and the base plate. In the figure, an elastic alloy or the like is formed into a flat cylindrical shape, and an anchor bolt is inserted through the center. If the anchor nut is tightened, it may be deformed more than necessary. The protective fence may be shaken by external force that is smaller than the collision, which may cause safety problems. Furthermore, the shock is shaken by vibration, etc. Even a material having a function may be broken by metal fatigue.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. To the grounding portion of the protective fence post that can prevent the protruding end of the anchor bolt from breaking and prevent the protective fence from causing unnecessary shaking. It is intended to provide a fixed structure.

  In order to achieve the above object, the present invention is configured as follows. That is, the structure for fixing the guard fence post to the ground cover portion according to the present invention is a structure in which the guard fence post is fixed to the ground cover portion via the anchor bolt, and the protruding end of the anchor bolt embedded in the ground cover portion. Is fixed to the base plate of the guard fence post and fixed with an anchor nut. A support fitting is interposed between the lower surface of the anchor nut and the upper surface of the base plate, and the protruding end of the anchor bolt is inserted into the support fitting. It has a flat horizontal portion and an upright portion that supports the horizontal portion from below, and the upright portion is provided with at least two bodies sandwiching the protruding end of the anchor bolt, and the support fitting is deformed when the anchor nut is tightened. The horizontal portion and / or the upright portion is deformed when a load that approximates the breaking of the protruding end of the anchor bolt is applied. And it is characterized in and.

  According to the structure for fixing the guard fence support to the ground cover according to the present invention, the anchor bracket is prevented from being deformed by the horizontal portion and the upright portion of the support bracket when the anchor nut is fastened. When the guard fence post is firmly fixed to the ground cover to prevent unnecessary shaking of the guard fence, the support bracket is subjected to a load that approximates the protruding end of the anchor bolt. Since the horizontal portion and / or the upright portion are deformed, it is possible to prevent the anchor bolt from being broken during a vehicle collision.

  Furthermore, if a reinforcing part protruding upward from the horizontal part is provided, and the reinforcing part is in contact with and fixed to the side surface of the guard fence post, the anchor bolt can be prevented from breaking and the external force of the guard fence pillar can be prevented. It is possible to increase the strength against.

  According to the structure for fixing the guard fence support to the ground cover according to the present invention, the anchor bracket is prevented from being deformed by the horizontal portion and the upright portion of the support bracket when the anchor nut is fastened. When the guard fence post is firmly fixed to the ground cover to prevent unnecessary shaking of the guard fence, the support bracket is subjected to a load that approximates the protruding end of the anchor bolt. Since the horizontal portion and / or the upright portion are deformed, it is possible to prevent the anchor bolt from being broken during a vehicle collision.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  1 and 2 are explanatory views showing an embodiment of a structure for fixing a guard fence post to a ground cover according to the present invention, and FIG. 1 is a guard fence to which a reinforcement structure of the guard fence pillar is applied. It is a perspective view which shows an example of a reinforcement metal fitting. The protective fence column 10 is erected at an interval from the ground surface, and the protective fence 100 is formed by providing two upper and lower horizontal beams 20 between the protective fence columns 10. The guard fence column 10 is formed by projecting a column main body 2 upward from the upper surface of the base plate 3, and the column main body 2 is provided with a wave 23 between a front flange 21 and a rear flange 22 and has a cross section. An H-shape is formed, and all members including the base plate 3 are made of steel, and the front flange 21, the rear flange 22, the wave 23, and the base plate 3 are firmly fixed to each other by welding. Yes. The base plate 3 is provided with a through-hole (not shown) penetrating in the vertical direction, and a projecting end 41 of two anchor bolts embedded in the ground cover G in advance and projecting upward is provided in the through-hole. The anchor nut 42 is screwed and fastened to the protruding end 41 of the anchor bolt.

  The support fitting 1 is provided between the front flange 21 and the back flange 22. The support fitting 1 is formed using a steel plate for general structure, and has a clog leg shape from the lower end of the flat plate-like horizontal portion 12 in which the bolt hole 121 through which the protruding end 41 of the anchor bolt is inserted is formed. Similarly, the three plate-like upright portions 11 are projected at equal intervals and at the same height, and the protruding ends 41 of the anchor bolts are arranged between the upright portions 11.

  FIGS. 2A and 2B show a state in which the support bracket 1 is attached to the protective fence column 10, wherein FIG. 2A is a side view and FIG. 2B is a longitudinal sectional view showing an AA section of FIG. First, in (a), the support metal fitting 1 is provided with the lower surface of the horizontal portion 12 spaced apart from the upper surface of the base plate 3 by the upright portion 11, and the anchor nut 42 is screwed onto the upper surface of the horizontal portion 12 via a washer 43. In this way, the guard fence post 10 is erected and fixed to the protruding end 41 of the anchor bolt. When the anchor nut 42 is tightened, a bending load is applied to the horizontal portion 12 in a vertically downward direction. However, since the upright portion 11 and the horizontal portion 12 are substantially vertical, the upright portion 11 is hardly deformed. If the upright portion 11 is used as a fulcrum and the material and thickness of the horizontal portion 12 can withstand the bending load according to the interval between the upright portions 11, the support fitting 1 will not be deformed when the anchor nut 42 is tightened. Then, the anchor nut 42 is tightened to firmly fix the protective fence column 10 to the ground cover portion so that unnecessary vibration is not generated in the protective fence 100.

  Further, when the vehicle collides with the protective fence 100 installed on the side edge of the roadway, a large impact is applied to the lateral beam 20, and the external force resulting from the impact is transmitted to the entire protective fence support 10 through the front flange 21. It is necessary to absorb the impact energy and reduce the impact on the driver of the vehicle at the time of the collision by deforming the protective fence column 10 against the external force while deforming to the back side. In some cases, the strength of the protective fence 100 may be increased. If the strength of the protective fence 100 is simply increased, the protective fence column 10 and the cross beam 20 can be replaced relatively easily by replacing the material with a high strength material or providing a reinforcing member. Bolts are often buried in the concrete ground cover G, and are difficult to replace or add. If the anchor bolt is left as it is and only the strength of the protective fence 100 is increased, even if a large external force is applied to the protective fence post 10 due to the collision of the vehicle and the protective fence post 10 and the cross beam 20 can withstand, the protruding end of the anchor bolt If 41 breaks beyond the shear strength near the base plate 3 or the anchor nut 42, the strength of the protective fence 100 as a whole cannot be increased.

  When the support metal fitting 1 is interposed between the lower surface of the anchor nut 42 and the upper surface of the base plate 3, the support metal fitting 1 is applied when a load that approximates the breaking of the protruding end 41 of the anchor bolt is applied. By deforming, the external force is absorbed, and it is possible to prevent a sudden shear load from being applied to the protruding end 41 of the anchor bolt. The support metal fitting 1 is deformed with respect to a load that approximates that the protruding end of the anchor bolt breaks. First, the horizontal portion 12 bends downward, and then the upright portion 11 begins to deform when the bend increases to some extent. Furthermore, since the upright portion 11 and the horizontal portion 12 are deformed, a gap is generated between the upper surface of the ground covering portion G and the lower surface of the base plate 3, and the stress applied from the anchor nut 42 and the base plate 3 to the protruding end 41 of the anchor bolt is sheared. Since the stress is changed to a value close to a bending stress, the possibility that the protruding end 41 of the anchor bolt breaks is further reduced. Further, both side edges of the support fitting 1 are provided at a distance from the inner surfaces of the front flange 21 and the rear flange 22, respectively, so that the support fitting 1 can be smoothly deformed.

  Since the support fitting 1 can withstand the external force at the time of tightening the anchor nut 42 and needs to be deformed smoothly when a load that approximates that the protruding end 41 of the anchor bolt breaks, a metal material is used. For example, metal materials such as steel, stainless steel, aluminum, zinc, and titanium, and alloys thereof can be used. However, the strength of the steel material for general structure as described above is used. And considering the economics and the like. These metal materials may be integrated as a plate-like body by welding, or may be integrally formed as an extruded profile.

  In (b), the support fittings 1 are respectively attached to protruding ends 41 of anchor bolts provided on both base plates 3 with the wave 23 interposed therebetween. The support metal fitting 1 may be provided only on the protruding end 41 of one anchor bolt across the wave 23, but it is preferable to provide the supporting metal fitting 1 on both sides in consideration of the balance of the load applied to the protruding end 41 of the anchor bolt. Since the edge of the horizontal portion 12 is located on the inner side of the edge of the base plate 3, it does not stand out in appearance, and it is possible to eliminate the risk of injury due to a pedestrian or the like being caught. Furthermore, since the side edge of the support metal fitting 1 is provided at a distance from the wave 23, smooth deformation of the support metal fitting 1 is not hindered.

  FIG. 3 is a longitudinal sectional view showing an example of a mounting method of the support metal fitting in the structure for fixing the guard fence support to the ground cover according to the present invention. First, in (a), the guard fence post 10 is an existing one, embedded in the ground cover G, and the protruding end 41 of the anchor bolt is inserted into the through hole 41 penetrating the base plate 3, and the anchor nut 42 is inserted. The anchor nut 42, which is fixed to the ground covering portion G by being screwed, is removed from the protruding end 41 of the anchor bolt using a tool. A support having a horizontal portion 12 in which a bolt hole 121 into which the protruding end 41 of the anchor bolt can be inserted is formed, and an upright portion 11 that is substantially perpendicular to the horizontal portion 12 and protrudes downward from the lower surface of the horizontal portion 12. The metal fitting 1 is prepared, and the support metal fitting 1 is placed on the base plate 3 so that the bolt hole 121 provided in the horizontal portion 12 is inserted into the protruding end 41 of the anchor bolt from above as shown in FIG. . The bolt hole 121 may be a round hole as long as the protruding end 41 of the anchor bolt can be inserted, but is preferably a long hole so that the distance between the side edge of the support fitting 1 and the wave 23 can be adjusted. Finally, as shown in (c), an anchor nut 42 is screwed onto the projecting end 41 of the anchor bolt and fastened. The anchor nut 42 is preferably used again if there is no problem such as corrosion. By applying the structure for fixing the protective fence post to the ground cover according to the present invention, it is possible to prevent the anchor bolt from being broken even with respect to the existing protective fence by such a simple operation.

  FIG. 4 is a perspective view showing another example of the support metal fitting used for the structure for fixing the protective fence to the ground cover according to the present invention. First, as shown in (a), the support bracket 1 may be provided with the upright portion 11 in the shape of a clog leg from the horizontal portion 12, and the integral support bracket 1 may be used for the protruding end 42 of the integral anchor bolt. . By using such a separate support bracket 1, the support brackets 1 having different strengths can be easily attached to the protruding ends 41 of the anchor bolts on the front flange 21 side and the rear flange 22 side. Moreover, as shown in (b), it is good also considering the upright part 11 provided below from the horizontal part 12 as a rectangular tube shape instead of a clog leg shape. By providing the upright portion 11 having the rectangular cylindrical shape, the strength against the load from above the upright portion 11 itself can be increased, and the horizontal portion 12 is supported so that the entire periphery of the horizontal portion 12 is supported from below. The strength against the bending load can be increased, and the strength against deformation of the support fitting 1 can be increased.

  FIG. 5 shows still another example of the support metal fitting used in the structure for fixing the protection fence to the ground cover according to the present invention, wherein (a) is a perspective view showing the protection fence and the support metal fitting 1; ) Is a longitudinal sectional view in a state in which a support fitting is attached. First, in (a), the support metal fitting 1 is formed by projecting three upright portions 11 downwardly in a clogged leg shape from the lower surface of the horizontal portion 12 in the same manner as shown in FIG. From one side edge of the plate 12, a plate-like reinforcing portion 13 is projected upward so as to form an L shape with the horizontal portion 12. The reinforcing portion 13 is brought into contact with the wave 23 when the support metal fitting 1 is attached, and a reinforcing rib 14 is integrally provided between the reinforcing portion 13 and the upper surface of the horizontal portion 12.

  (B) is a longitudinal sectional view showing a state in which the support metal fitting 1 is attached to the protective fence post 10. The upright portion 11 and the horizontal portion 12 provide an anchor nut 42 at a distance from the base plate 3, and a reinforcing portion 13 is disposed between the front flange (not shown in the figure) and the rear flange 22. While suppressing the deformation of both flanges, the reinforcing portion 13 is brought into contact with the wave 23 and fixed with bolts 231 and nuts 232, thereby obtaining the same effect as increasing the thickness of the wave 23. At the same time, the torsional deformation of the wave 23 when the protective fence post 10 is deformed is suppressed. By attaching the support bracket 1, it is possible to simultaneously prevent the anchor bolt protruding end 41 from being broken and improve the strength of the protective fence support 10 against the external force.

  FIG. 6 is a perspective view showing still another example of the protective fence to which the structure for fixing the protective fence to the ground cover according to the present invention is applied. The column main body 2 of the guard fence column 10 is formed using a square steel pipe, and a guard beam 100 is formed by passing a horizontal beam 20 made of a square steel pipe between the guard fence columns 10. Yes. A right-angled triangular plate-like rib 24 is provided between the upper surface of the base plate 3 on the front side and the side surface of the column main body 2 of the protective fence column 10 to enhance the resistance to external force from the front side. By attaching the support bracket 1 to the guard fence post 10 as well, the support bracket 1 is deformed when a load that approximates that the protruding end 41 of the anchor bolt breaks when the vehicle collides. Breakage of the protruding end 41 of the anchor bolt can be prevented.

  FIG. 7 is a perspective view showing still another example of the protective fence to which the structure for fixing the protective fence to the ground cover according to the present invention is applied. Unlike the structure shown in FIG. 1, the column body 2 of the protective fence column 10 has a T-shaped cross section without a rear flange, and the horizontal beam 20 is fitted to the horizontal beam receiving portion 101 provided on the front flange 21. It is attached and fixed with bolts (not shown). By attaching the support bracket 1 to the guard fence post 10 as well, the support bracket 1 is deformed when a load that approximates that the protruding end 41 of the anchor bolt breaks when the vehicle collides. Breakage of the protruding end 41 of the anchor bolt can be prevented. Furthermore, if the support metal fitting 1 as shown in FIG. 5 is applied, the column main body 2 having a T-section is likely to be twisted and deformed in the wave 23, but the torsional deformation is suppressed by the reinforcing portion 13, and a protective fence is further provided. The strength against an external force of 100 is increased.

It is explanatory drawing which shows one Embodiment of the fixation structure to the ground cover part of the protection fence concerning this invention. It is explanatory drawing which shows one Embodiment of the fixation structure to the ground cover part of the protection fence concerning this invention. It is a longitudinal cross-sectional view which shows an example of attachment of the support metal fitting of the fixation structure to the ground cover part of the protection fence concerning this invention. It is a perspective view which shows the other example of the support metal fitting used for the fixing structure to the ground cover part of the protection fence concerning this invention. It is explanatory drawing which shows the further another example of the support metal fitting used for the fixing structure to the ground cover part of the protection fence concerning this invention. It is a perspective view which shows the other example of the protection fence to which the fixing structure to the ground cover part of the protection fence concerning this invention is applied. It is a perspective view which shows the further another example of the protection fence to which the fixation structure to the ground cover part of the protection fence concerning this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support bracket 11 Upright part 12 Horizontal part 2 Support | pillar body 3 Base plate 41 The protruding end of an anchor bolt 42 Anchor nut 10 Guard fence pillar 20 Cross beam 100 Guard fence G Ground cover part

Claims (2)

In the structure in which the guard fence post is fixed to the ground cover via anchor bolts, the anchor bolt's protruding end is inserted into the base plate of the guard fence post and fixed with the anchor nut. A support bracket is interposed between the lower surface of the anchor nut and the upper surface of the base plate, and the support bracket includes a flat horizontal portion through which the protruding end of the anchor bolt is inserted, and an upright portion that supports the horizontal portion from below. The upright portion is provided with at least two bodies sandwiching the protruding end of the anchor bolt, and the support metal fitting is not deformed when the anchor nut is tightened, and a load approximating that the protruding end of the anchor bolt is broken is applied. A structure for fixing the guard fence post to the ground covering portion, wherein the horizontal portion and / or the upright portion is deformed in the event of failure. The protective fence post according to claim 1, further comprising a reinforcing portion projecting upward from the horizontal portion, and the reinforcing portion is fixed in contact with a side surface of the protective fence post. Fixing structure to the ground cover.

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