JP2006104756A - Guard fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guard fence which minimizes projective feeling of a bolt head at a beam pipe joint portion, exhibits good appearance, is simple in structure, low in parts cost, and good in workability. <P>SOLUTION: According to the structure of the guard fence, an inner sleeve 7 is mounted on a roadway-side surface of a support 2 via a bracket 6, and an end of a beam pipe 3 is fitted onto the inner sleeve 7, followed by fixing the beam pipe 3 to the inner sleeve 7 by a bolt 13 penetrating an externally fitting portion and a nut 14 screwed onto the bolt 13. The bolt 13 diagonally penetrates the externally fitting portion such that the bolt head 20 is decentered from a tip portion b of the beam pipe 3 toward the roadway side (on the right side in Fig.), and that the bolt head 20 does not protrude upward from the tip portion of the beam pipe 3. Further the head 20 of the bolt 13 exhibits a thin curved shape along an external peripheral surface of the beam pipe 3 as a whole. In this manner the head 20 of the bolt 13 does not protrude upward from the tip portion of the beam pipe 3, and therefore projective feeling of the bolt head 20 is suppressed, which does not spoil environmental landscape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a protective fence having a structure in which a beam pipe continuous along a road is provided at a position higher than the upper end of a column.

  Among various guard fences, there is a guard fence provided with a beam pipe continuous along the road at a position higher than the upper end of the column. When installing a beam pipe (so-called top beam) at a position higher than the upper end of the column in this type of protective fence, when installing it as a vehicle protective fence, by installing the beam pipe at a position protruding from the upper end of the column to the roadway side, It can be provided with a vehicle guidance function that smoothly guides the vehicle when it collides with the protective fence. In the case of a protective fence installed at the boundary between the roadway and the sidewalk, the beam pipe at the upper end is a handrail. Also works.

  In recent years, demand for landscapes in urban areas and nature / country areas has increased, and among them, the weight of road landscapes is large. In consideration of the fact that protective fences that are continuously installed along the road are a major factor for road landscapes, the Ministry of Land, Infrastructure, Transport and Tourism Road Bureau has formulated the “Guidelines for Maintenance Fences Considering Landscape”. Along with this, the “protection fence installation standard” has been reviewed. In the various matters described in the “Guidelines for the maintenance fences that take into consideration the landscape”, it is said that the exposure or protrusion of the bolts and nuts of the protection fences should be avoided as much as possible. The fence is required to meet such needs.

In the above-mentioned protective fence with a top beam, generally, a bracket is fixed to the road surface side surface of the cap attached to the upper end of the column or directly to the road surface side surface of the upper end of the column, and the central portion of the inner sleeve is fixed to the bracket Is fixed with bolts, and the beam pipe is fixed to the inner sleeve with bolts. The shape of the cap or bracket is such that the inner sleeve and the beam pipe are positioned above the upper end of the column on the roadway side.
In this type of protective fence, various structures have been proposed as a structure for concealing the head of the bolt for fixing the beam pipe to the inner sleeve or a structure for minimizing protrusions from the viewpoint of landscape.

  For example, in the “guard fence” of Japanese Patent Application Laid-Open No. 2003-176513 (Patent Document 1), as shown in FIGS. 13 and 14, the upper end opening of the support column 31 is inclined with the roadway side (left side in FIG. 14) becoming higher. A cap 32 having an upper surface is fixed with a bolt 33, a bracket 34 extending obliquely upward on the roadway side is fixed to the surface of the cap 32 with a bolt 35, and a central portion in the longitudinal direction of the inner sleeve 36 is fixed to the bracket 34. The end of the beam pipe 38 is externally fitted to the left and right extending portions of the inner sleeve 36, and the fitting portion is fixed to the inner sleeve 36 with bolts 39 that penetrate from the top to the bottom. In this guard fence, the bolt insertion hole 38a of the beam pipe 38 is recessed to form a recess 38b for receiving the head 39a of the bolt 39. The upper part of the inner sleeve 36 is also deformed in accordance with the recess 38b. Since the bolt head portion 39a is accommodated in the recess 38b, the bolt head portion 39a does not protrude from the outer peripheral surface of the beam pipe 38.

Although not shown, JP 2003-49818 A (Patent Document 2) uses special nut fixing brackets for pipe material in which nuts are fitted into a plurality of caulking holes formed in a metal band plate material and are caulked. The tube nut fixing bracket is inserted into the inner sleeve, and the bolt inserted from the lower surface side of the beam pipe is screwed into the nut of the tube nut fixing bracket in the inner sleeve and fastened to tighten the beam pipe. It is fixed to the inner sleeve.
Therefore, the bolt for fixing the beam pipe only has its head exposed at the lower surface of the beam pipe, and no bolts and nuts are exposed at the upper surface of the beam pipe.

  Moreover, although illustration is omitted, in the “fence fittings for rails” of Japanese Patent No. 2905737 (Patent Document 3), a column mounting bracket fixed to the surface on the roadway side of the upper end portion of the column with a bolt, and the column mounting bracket A joint fitting made up of a beam pipe (mountain) holding bracket to be mounted is used, and the beam pipe holding bracket is also connected to the beam pipe receiving member that is bolted to the column mounting bracket and the beam pipe on the front side (the roadway side). ) And a lid member covering so as to be held. And the bolt is made inconspicuous by setting the position of the bolt for fixing the lid member to the beam pipe bracket to the lower part of the beam pipe.

Further, although not shown, in the “road guard fence” of Japanese Patent Laid-Open No. 11-152718 (Patent Document 4), as in Patent Document 1, a cap is fixed to the upper end opening of the column, and the surface of the cap on the road side The bracket is fixed to the inner sleeve, and the inner sleeve is fixed to the bracket. In this `` road guard fence '', the end of the beam pipe is inserted into the inner sleeve, and the inner sleeve is This is a structure in which an engagement protrusion is provided on the inner surface side of each divided piece having a two-part structure and a semicircular cross section. The beam pipe is fixed to the inner sleeve by fitting the engagement protrusion on the inner surface of the inner sleeve into the engagement hole formed in the beam pipe. In this beam pipe joint structure, bolts for fixing the beam pipe are not used.
FIG. 2, FIG. 3, etc. of JP2003-176513 FIG. 1, FIG. 2, FIG. 3 of JP-A-2003-49818 Patent No. 2905737, FIG. 2 etc. Japanese Patent Application Laid-Open No. 11-152718, FIG.

As in the above-mentioned conventional Patent Document 1, it is preferable that the recess is formed on the upper surface of the beam pipe in that the bolt head does not protrude, but it is aesthetically preferable that there is a recess. Absent. In addition, the modification of the specifications of the beam pipe itself is involved, and the process of forming the recess in the beam pipe is complicated, and the cost of parts increases.
In addition, the structure using a special nut fixing member for pipe material as in Patent Document 2 increases the cost of parts, increases the number of parts, and makes the workability worse. Moreover, workability is bad in that the bolt is inserted from the lower surface side.
Like patent document 3, the joint metal fitting for fences which consists of many members becomes high in part cost. Moreover, many bolting operations are required, and the assembly workability is poor.
As in Patent Document 4, the inner sleeve is divided into two semi-circular cross-section pieces having engagement protrusions on the inner surface, and the engagement protrusions on the inner sleeve inner surface are inserted into the engagement holes of the beam pipe. What is engaged has a complicated structure, a large number of parts, a high cost, and poor workability.

  The present invention was made to eliminate the above-mentioned conventional drawbacks, and does not require specification changes on the inner sleeve or beam pipe side, is simple in structure, has low component cost, and has good workability. An object of the present invention is to provide a beam pipe joint structure having a small projecting feeling at the head of a bolt and having a good landscape.

The invention of claim 1 that solves the above-described problem is provided on the road-side surface of the upper end of each column that is erected with a gap on the road side or on the road-side surface of the cap attached to the upper end of the column via brackets. A cylindrical inner sleeve is attached in the longitudinal direction of the beam pipe, and the end of the cylindrical beam pipe is externally fitted to each inner sleeve, and a bolt that penetrates the external fitting portion and a nut that is screwed to this bolt Is a protective fence formed by fixing each beam pipe to the inner sleeve,
The bolt has the outer fitting portion, and the head of the bolt is eccentric from the top of the beam pipe to the roadway side and obliquely penetrates from top to bottom, and the amount of eccentricity is such that the head of the bolt is higher than the top of the beam pipe. And the eccentricity of the beam pipe so that it does not protrude toward the roadway side from the end surface on the roadway side of the beam pipe, and the head of the bolt is circular or oval when viewed from above, and its upper surface is A convex curved surface is formed, and a lower surface forms a curved surface along the outer peripheral surface of the beam pipe, and a thin curved shape along the outer peripheral surface of the beam pipe is formed as a whole.

According to the invention of claim 2, the brackets are respectively provided on the roadway side surface of the upper end portion of each column erected with a space between the roadway and the sidewalk or on the roadway side surface of the cap attached to the upper end of the column. A cylindrical inner sleeve is attached in the longitudinal direction of the beam pipe, and the end of the cylindrical beam pipe is externally fitted to each inner sleeve, and a bolt that penetrates the external fitting portion and a nut that is screwed to this bolt Is a protective fence formed by fixing each beam pipe to the inner sleeve,
The bolt penetrates the outer fitting portion diagonally from the top to the bottom by decentering the head of the bolt from the top of the beam pipe to the sidewalk side,
The amount of eccentricity is such that the head of the bolt is lower than the top height position of the beam pipe, and the end of the bolt shaft or the nut that is screwed to the bolt shaft is closer to the end surface of the beam pipe on the road side. It is an eccentric amount that does not protrude to the roadway side,
The head of the bolt is circular or oval when viewed from above, and its upper surface forms a convex curved surface upward and the lower surface forms a curved surface along the outer peripheral surface of the beam pipe, It has a thin curved shape along the outer peripheral surface.

  According to a third aspect of the present invention, in the protective fence according to the first or second aspect, an oblong square root for preventing rotation that fits into a long hole for inserting a bolt formed in a beam pipe is provided on a lower surface portion of the head of the bolt. It is formed.

  According to a fourth aspect of the present invention, in the protective fence according to the third aspect, the long diameter of the bolt insertion elongated hole formed in the beam pipe is formed so as to coincide with the longitudinal direction of the beam pipe.

  According to a fifth aspect of the present invention, in the protective fence according to the first to fourth aspects, the bracket has a cylindrical cross-sectional shape in which a U-shaped cross-section portion on the side fixed to the support column and a lateral U-shaped cross-section portion on the opposite side are continuous. None, wherein the inner sleeve is fixed to the bracket in a state of being fitted in a laterally U-shaped cross section of the bracket.

  A sixth aspect of the present invention is the protective fence according to the fifth aspect, wherein the upper end surface of the support column is inclined at an inclination that the roadway side becomes higher, and the upper end portion of the support column is covered with a cap. A semicircular shape having a cross-sectional shape in which the roadway side portion forms a U-shape, and includes a cylindrical portion that covers the upper end of the column and an inclined top plate that follows the upper end surface of the column, and the bracket is an inclined ceiling of the cap. A bracket fixing bolt, which has an inclined upper surface continuous with the plate and penetrates the cap and the column from the side opposite to the roadway side of the column, is screwed into the screw hole provided in the U-shaped cross section of the bracket fixed side. The bracket is fixed to the support column by fastening.

According to the first aspect of the present invention, the head of the bolt for fixing the beam pipe for fixing the beam pipe to the inner sleeve does not protrude higher than the top of the beam pipe. A protective fence with an excellent appearance that does not impair the landscape and the head is not conspicuous.
Furthermore, since the head of the bolt does not protrude from the road pipe side end face of the beam pipe to the road side, the vehicle guiding function at the time of vehicle collision is not hindered.
In addition, the bolt head has a thin curved shape along the outer peripheral surface of the beam pipe as a whole, so that the bolt head does not protrude higher than the top of the beam pipe when the bolt head is eccentric. This makes it easy to implement in an actual protective fence.
In addition, the bolt head shape itself having a thin curved shape along the outer peripheral surface of the beam pipe as a whole exhibits an excellent appearance that is not conspicuous and does not impair the scenery.
Further, since the upper surface of the bolt head has a smooth curved surface, there is little risk of damaging clothes and the body with the bolt head.
In addition, as a means to obtain a structure where the bolt head is not conspicuous, it is only necessary to change the bolt head, and it is not necessary to change the specifications on the inner sleeve or beam pipe side. The cost for doing so can be reduced.
Further, since the bolt is inserted from above, the work is easy to perform and the workability is good as compared with the conventional structure in which the bolt is inserted upward from below.
In addition, since the structure is simple and the number of parts is small, the work is easy, the workability is good, and the construction cost is low.

The protective fence of the invention of claim 2 is a case where it is installed as a protective fence at the boundary of the walking path, but since the bolt head is eccentric to the sidewalk side, the bolt head is screwed to the sidewalk side and the lower end of the bolt. The nut part to come to the roadway side. Therefore, pedestrians walking along the sidewalk of the protective fence can see the bolt heads that are rounded and have little protrusion, but the nuts that give the impression of the back are not visible, so they are visible to the pedestrians. The surface can give the impression that it is the surface on the front side of the protective fence and presents a favorable landscape.
In addition, there is a risk that pedestrian clothes, heels, etc. may be caught on the nut part where the lower end of the bolt shaft protrudes. Since the bolt head on the side is on the sidewalk side, there is little risk of such a catch.
Further, the amount of the eccentricity is an amount of eccentricity such that the end portion of the bolt shaft or the nut screwed into the bolt shaft protrudes most toward the roadway side from the roadway side end surface of the beam pipe. The vehicle guidance function at the time of collision is not hindered.

  According to the third or fourth aspect, since the square root is formed on the lower surface of the head portion of the bolt to prevent the rotation, the bolt is not accompanied when the nut screwed into the bolt is turned. Work is easy and workability is good.

  According to the sixth aspect of the present invention, since the inclination of the upper surface (top plate) of the cap at the upper end of the support and the inclination of the upper surface of the bracket is substantially continuously inclined, a smooth and extremely simple appearance is obtained. As a type of protective fence in which the pipe is located at a position higher than the upper end of the support column and projecting from the support column to the roadway side, a protective fence that is excellent in aesthetics and is preferable to the landscape can be obtained.

  Hereinafter, embodiments of the protective fence of the present invention will be described with reference to FIGS.

  11 and 12 schematically show the overall structure of the guard fence 1 according to the present invention. Reference numeral 2 denotes a support post, 3 'denotes a beam pipe provided at an intermediate height position of the support post 2, and 3 denotes a slight amount from the upper end of the support post 2. It is a beam pipe (so-called top beam) provided so as to be on the upper side (that is, slightly higher). In FIG. 12, the left side of the column 2 is a roadway, and the right side is a sidewalk or a shoulder.

  Details of the vicinity of the upper end portion of the support column 2 in the protective fence 1 (a portion in FIG. 11) are shown in FIGS. As shown in these drawings, the upper end of the support fence 1 has a cap 23 attached to the upper end of the support 2, and the bracket 6 is fixed to the support 2 with bolts 8 at the cap 23. The inner sleeve 7 is attached to the support 2 side, and the beam pipe 3 is fixed to the inner sleeve 7 with bolts 13 and nuts 14.

  The upper end surface of the support column 2 is inclined with an inclination so that the roadway side becomes higher, and the cap 23 covering the upper end of the support column 2 is the roadway as seen from above as shown in FIGS. 6, 7 </ b> A, 7 </ b> B. The side portion (the right side in FIG. 7) is formed of a cylindrical portion 23a having a semicircular shape on the opposite side and a U-shaped portion on the roadway side, and an inclined top plate 23b that follows the upper end surface of the column. It covers the upper end of the column 2.

The bracket 6 is formed by bending a steel plate. As shown in FIGS. 5, 7 (c) and 7 (d), the upper and lower sides of the U-shape are curved inwardly in a circular arc shape. 2 is formed into a cylindrical cross-sectional shape in which a U-shaped cross-sectional portion 6b having a base portion 6a fixed to 2 and a lateral U-shaped cross-sectional portion 6c on the opposite side with a slight gap at the tip are continuous. The U-shaped cross-sectional portion 6 b of the bracket 6 of the embodiment has an inclined surface such that the lower surface (lower side of the U-shape) is a horizontal surface and the upper surface (upper side of the U-shape) extends the inclination of the upper surface of the cap 23. The base 6a of the bracket 6 is formed with a screw hole 6d into which a bracket fixing bolt 8 is screwed. The base 8a of the bracket 6 is applied to the roadway side surface of the cap 23 that covers the column 2, and the bolt 8 is inserted through the through hole 23c of the cap 23 and the through hole 2a of the column 2 from the rear surface side of the column 2. Are screwed into the screw holes 6 d of the bracket 6 and fastened, and the bracket 6 is fixed to the support column 2 together with the cap 23.
In this embodiment, a U-shaped cut is made in the lower surface portion of the bracket 6 and raised up, and a screw hole 6f is formed in the cut-and-raised piece 6e for screwing a screw 24 for pushing up the inner sleeve 7. 6g shows the hole part formed by cutting up. When the screw 24 is screwed and the inner sleeve 7 is pushed up, the inner sleeve 7 comes into close contact with the upper inner surface of the bracket 6 and the height of the inner sleeve 7 is positioned without any play.

A hole 7c (see FIG. 5) through which the bracket fixing bolt 8 is inserted is formed in the center of the inner sleeve 7, and also shown in FIGS. 4, 7 (e) and (f) on the left and right sides. In this manner, bolt insertion elongated holes 7a and 7b through which the beam pipe fixing bolts 13 pass are formed. As described later, the upper bolt insertion long hole 7a is eccentric from the top of the inner sleeve 7, and the two bolt insertion long holes 7a and 7b penetrate obliquely. The major axis direction of the bolt insertion elongated holes 7a and 7b is the beam longitudinal direction.
The inner sleeve 7 is passed through the laterally U-shaped portion 6c of the bracket 6 with the spacer 25 disposed on the support column side (the U-shaped cross-section portion 6b) of the bracket 6, and the bracket fixing bolt is inserted into the hole 7c. The movement of the protective fence longitudinal direction (direction orthogonal to the paper surface in FIG. 5) is restricted through the front end portion of 8. The spacer 25 has a U-shape when viewed from above, and has arc-shaped surfaces 25a along the outer peripheral surface of the inner sleeve 7 on both sides of the U-shape, and has a hole 25b through which the bolt 8 passes in the center. The inner sleeve 7 is restrained from moving in the longitudinal direction of the protective fence as described above by the bolt 8 inserted into the hole 7c, and the inner surface of the lateral U-shaped portion 6c of the bracket 6 and the arc surface 25a of the spacer 25 are It is attached to the roadway side of the column 2 by restraining movement in the direction orthogonal to the direction (left and right direction in FIG. 5).

  The beam pipe 3 is externally fitted to the left and right extending portions of the inner sleeve 7, and a beam pipe fixing bolt 13 that penetrates the external fitting portion obliquely from the upper side to the lower side as shown in FIG. The nut 14 is fixed to the inner sleeve 7 by a screwed lower nut 14. In other words, the beam pipe fixing bolt 13 has its head portion 20 eccentric from the top of the beam pipe (position of arrow b in FIG. 4) to the roadway side (right side in FIG. 4) and obliquely penetrates from top to bottom. The amount of eccentricity is such that the bolt head 20 does not protrude above the top height position of the beam pipe 3 (indicated by a horizontal line m in FIG. 4). Accordingly, the upper holes 3a and 7a out of the bolt insertion long holes 3a and 3b of the beam pipe 3 through which the bolt 13 is inserted and the bolt insertion long holes 7a and 7b of the inner sleeve 7 have an eccentric amount as described above. The top of the beam pipe 3 or the top of the inner sleeve 7 is eccentric to the roadway side, and the lower holes 3b and 7b are eccentric to the opposite side. Further, each of the bolt insertion elongated holes 3a, 3b, 7a, 7b is a mere hole whose inner peripheral surface is parallel to the plate thickness direction, and is recessed around the holes 3a, 3b, 7a, 7b, etc. No special processing is done.

Details of the beam pipe fixing bolt 13 for fixing the beam pipe 3 to the inner sleeve 7 will be described with reference to FIGS. 8A is a front view of the bolt 13 and FIG. 8B is a plan view thereof. 9 (a) is an enlarged view of the head 20 of the bolt 13 of FIG. 8, FIG. 9 (b) is a side view of FIG. 9 (a), and FIG. 9 (c) is a cross-sectional view taken along the line CC in FIG. FIG. As shown in these drawings, the head portion (bolt head portion) 20 of the bolt 13 has a special shape. That is, the bolt head 20 has a circular shape when viewed from above, and has an upper surface forming a smooth curved surface convex upward and a lower surface 20a forming a cylindrical curved surface along the outer peripheral surface of the beam pipe 3. A thin curved shape along the outer peripheral surface of the beam pipe 3 is formed as a whole part.
Note that the shape viewed from above the bolt head 20 is not a perfect circle, and the diameter in the vertical direction in FIG.

Further, on the lower surface portion of the head portion 20 of the bolt 13, an anti-rotation square root 21 that fits into the beam pipe insertion long hole 3 a formed in the beam pipe 3 is formed. As shown in FIG. 8 (b), the square root 21 has an oval shape that is slightly smaller than the long hole 3 a for inserting the bolt of the beam pipe 3, and the major axis direction is the same as the longitudinal direction of the beam pipe 3. I'm doing it.
Further, the upper surface of the bolt head 20 is a curved surface having a large radius of curvature near the center and a small radius of curvature at the periphery. In the illustrated example, the shape of the bolt head 20 viewed from the longitudinal direction of the beam pipe is not substantially different in curvature radius between the vicinity of the central portion and the left and right edges, and is almost constant (see FIG. 9 (A)). As shown in FIG. 9 (b), the shape viewed from the front side of the protective fence has a large radius of curvature near the center, a small radius of curvature at the left and right edges, and the difference in radius of curvature is quite large. For this reason, especially the external appearance of the bolt head 20 seen from the front side of the protective fence is an external appearance with little protrusion.

According to the guard fence 1 described above, the head 20 of the beam pipe fixing bolt 13 is in an eccentric position from the top of the beam pipe and does not protrude higher than the top of the beam pipe. There is little sense of protrusion, and a protective fence with an excellent appearance is obtained in which the bolt head 20 is not conspicuous and the landscape is not impaired.
Further, since the head portion 20 of the bolt does not protrude from the end surface of the beam pipe 3 on the side of the roadway, the vehicle guiding function at the time of a vehicle collision is not hindered.
Further, since the bolt head 20 has a thin curved shape along the outer peripheral surface of the beam pipe 3 as a whole, when the bolt head 20 is eccentric, the bolt head 20 is more than the top of the beam pipe. It is easy to set so as not to protrude high in an actual protective fence.
Further, the shape of the bolt head 20 that forms a thin curved shape along the outer peripheral surface of the beam pipe 3 as a whole exhibits an excellent appearance that is not conspicuous and does not impair the scenery.
In addition, since the upper surface of the bolt head 20 forms a smooth curved surface, there is little risk of damaging clothes and the body with the bolt head.
Moreover, as a means for obtaining a structure in which the bolt head 20 is not conspicuous, it is only necessary to change the bolt head 20, and it is not necessary to change the specifications on the inner sleeve or the beam pipe side. The cost for the structure can be reduced. Even if the bolt 13 penetrates diagonally, the beam pipe 3 and the inner sleeve 7 can be rotated so that the positions of the bolt insertion slots 3a, 3b, 7a, 7b match the oblique angle. Therefore, it is not necessary to change the specification by adopting a structure in which the bolt 13 is penetrated obliquely.
Further, since the bolt 13 is inserted from above, the work is easy to work and the workability is good as compared with the conventional structure in which the bolt is inserted upward from below.
In addition, since the structure is simple and the number of parts is small, the work is easy, the workability is good, and the construction cost is low.
Moreover, since the square root 21 is formed on the lower surface of the head of the bolt 13 to prevent rotation, the bolt 13 is not accompanied when the nut 14 screwed into the bolt 13 is rotated. In terms of work, work is easy and workability is good.

  When the eccentric amount of the bolt 13 for fixing the beam pipe is defined by the inclination angle of the bolt 13, the inclination angle should be as small as possible within the range where the bolt head 20 does not protrude above the top of the beam pipe 3. However, in terms of aesthetics, it is preferable to stop within about 45 °. The minimum inclination angle is determined according to the thickness of the bolt head 20.

In the guard fence 1 of the above embodiment, the eccentric direction of the head 20 of the bolt 13 for fixing the beam pipe is on the roadway side (right side in FIG. 4), but for the boundary of the walking road installed at the boundary between the sidewalk and the roadway. In the case of a protective fence, as in the protective fence 1 'shown in FIG. 10, the head 20 of the bolt 13 is eccentric to the sidewalk side (left side in FIG. 10), and the bolt head 20 is at the lower end of the bolt on the sidewalk side. It is preferable to have a structure in which the nut 14 that is screwed to the vehicle is on the roadway side.
The amount of eccentricity of the head 20 of the bolt 13 in this case is an amount of eccentricity so that the bolt head 20 does not protrude above the top height position of the beam pipe 3 as in the previous embodiment, The bottom end of the shaft of the bolt 13 or the end of the nut 14 that protrudes most on the roadway side is an eccentric amount that does not protrude toward the roadway side from the roadway side end surface (indicated by a vertical line n in FIG. 10) of the beam pipe. It is set so as to satisfy these two conditions. The other parts of FIG. 10 are the same as those of the embodiment of FIGS.
In the case of a guard fence at the boundary between the sidewalk and the roadway, the appearance visible to pedestrians passing through the sidewalk is regarded as important, so the bolt head 20 is decentered on the opposite side of the roadway, that is, on the sidewalk side. Thus, the appearance for pedestrians is improved. That is, a pedestrian walking along the sidewalk of this protective fence 1 'can see the bolt head 20 that is rounded and has a little protruding feeling, but cannot see the nut 14 portion that gives an impression as the back surface. Thus, the visible surface can give the impression of the surface on the front side of the protective fence, and presents a favorable landscape. Since the bolt head 20 is lower than the top of the beam pipe 3, the bolt head 20 is not conspicuous in the same manner as in the above-described embodiment.
Further, there is a risk that a pedestrian's clothes, a heel, or the like may be caught on the nut 14 portion from which the lower end of the bolt protrudes. Because there is a roadway side, there is little fear of such a catch.
Further, in this embodiment, the nut 14 part comes to the roadway side, but the lower end part of the bolt shaft or the part of the nut 14 does not protrude from the roadway side end face of the beam pipe 3 to the roadway side. Does not inhibit the induction function.

The heads 20 of the beam pipe fixing bolts 13 in the protective fences 1 and 1 ′ of each of the above embodiments are circular when viewed from above, but may be oval. In this case, it is appropriate to use an oval shape whose major axis coincides with the longitudinal direction of the beam pipe. Further, the peripheral portion of the bolt head 20 may be chamfered. In addition, in the above embodiment, the beam pipe fixing bolt 13 is provided with a square root 21 for preventing rotation on the lower surface of the head 20. A bolt that does not provide a square root may be used. In this case, a cross hole may be provided in the bolt head. Moreover, the bolt insertion hole of the beam pipe 3 may be a round hole.
In the embodiment, the washer 15 attached to the nut 14 screwed into the bolt 13 is flat, but a washer having a curved surface along the outer peripheral surface of the beam pipe 3 may be used.

The bracket 6 of the embodiment has an inclined upper surface portion, but may be a horizontal surface parallel to the lower surface portion. Further, it may be a closed cylindrical shape with no gap at the tip of the lateral U-shaped portion 6c. In addition, various structures can be adopted as the structure of the bracket. Also, the means for fixing the bracket to the support is not limited to the above embodiment.
In the embodiment, as described with reference to FIG. 5, the end of the bracket fixing bolt 8 is inserted into the hole 7 c formed in the inner sleeve 7, and the inner sleeve 7 and the inner surface of the base 6 a of the bracket 6 are connected. The spacer 25 is arranged between them to attach the inner sleeve 7 to the support 2 side with the bracket 6 interposed. Other means for attaching the inner sleeve 7 to the support 2 via the bracket 6 are other Various structures can be employed.
The protective fence of the above embodiment has two intermediate beam pipes 3 ′ excluding the top beam (the beam pipe 3 at the upper end of the support column), but the number of intermediate beam pipes is arbitrary.
Furthermore, the present invention can also be applied to a protective fence having a structure provided as a top beam at the upper end of a guard rail column.

It is a front view which shows the vicinity (however, the state which removed the beam pipe of the one side of a support | pillar) of the support | pillar upper end part in the protection fence of one Example of this invention. It is a rear view of FIG. FIG. 3 is a left side view of FIG. 2. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the part shown in FIG. It is a figure explaining the shape of a cap in the above, a bracket, an inner sleeve, a spacer, a beam pipe, etc. FIG. 5 shows a detailed shape of a beam fixing bolt in FIG. 4, (A) is a front view, and (B) is a plan view (however, a beam pipe is also shown). FIG. 9 shows the detailed shape of the head of the bolt in FIG. 8, (A) is an enlarged view of the main part of FIG. 8 (A), (B) is a side view of FIG. 9 (A), and (C) is FIG. It is CC sectional drawing of a). FIG. 5 shows another embodiment of the present invention and corresponds to FIG. It is a front view which shows roughly the whole structure of the guard fence of this invention. It is a right view of FIG. It is a front view which shows the beam pipe joint part in the conventional protective fence. It is DD sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guard fence 2 Support | pillar 2a Through-hole 3 Beam pipe 3a, 3b Bolt insertion long hole 6 Bracket 6a Base part 6b U-shaped cross-section part 6c Sideways U-shaped part 6d Screw hole 6e Cut-and-raised part 6f Screw hole 7 Inner sleeves 7a, 7b Bolt insertion long hole 7c Hole 8 Bracket fixing bolt 13 (Beam pipe fixing) bolt 14 Nut 20 Bolt head 21 Square root 23 Cap 23a Cylindrical portion 23b Top plate 23c Through hole 24 Screw 25 Spacer 25a Arc surface 25b hole

Claims (6)

Cylindrical inner sleeves in the longitudinal direction of the beam pipe are respectively attached to the road-side surface of the upper end of each column that is erected on the road side or on the road-side surface of the cap attached to the upper end of the column via a bracket. The end of the cylindrical beam pipe is externally fitted to each inner sleeve, and each beam pipe is fixed to the inner sleeve by a bolt penetrating this external fitting part and a nut screwed to this. A protective fence,
The bolt penetrates the outer fitting portion obliquely from the top to the bottom by decentering the head of the bolt from the top of the beam pipe to the roadway side,
The amount of eccentricity is an amount of eccentricity such that the head of the bolt is lower than the height position of the top of the beam pipe and does not protrude from the end surface of the beam pipe toward the roadway side,
The head of the bolt is circular or oval when viewed from above, and its upper surface forms a convex curved surface upward and the lower surface forms a curved surface along the outer peripheral surface of the beam pipe, A protective fence characterized by a thin curved shape along the outer peripheral surface. Cylindrical inner sleeves are respectively attached via brackets to the roadway side surface of the upper end of each column that stands up at the boundary between the roadway and the sidewalk, or to the roadway side surface of the cap attached to the upper end of the column. The beam pipe is attached in the longitudinal direction, and the end of the cylindrical beam pipe is externally fitted to each inner sleeve, and each beam pipe is connected to the inner by a bolt passing through the external fitting and a nut screwed to the bolt. A protective fence fixed to a sleeve,
The bolt penetrates the outer fitting portion diagonally from the top to the bottom by decentering the head of the bolt from the top of the beam pipe to the sidewalk side,
The amount of eccentricity is such that the head of the bolt is lower than the top height position of the beam pipe, and the end of the bolt shaft or the nut that is screwed to the bolt shaft is closer to the end surface of the beam pipe on the road side. It is an eccentric amount that does not protrude to the roadway side,
The head of the bolt is circular or oval when viewed from above, and its upper surface forms a convex curved surface upward and the lower surface forms a curved surface along the outer peripheral surface of the beam pipe, A protective fence characterized by a thin curved shape along the outer peripheral surface.   3. The protection according to claim 1, wherein an oblong square root for preventing rotation is formed on a lower surface portion of the head of the bolt so as to be fitted into a long hole for inserting a bolt in a beam pipe. fence.   The protective fence according to claim 3, wherein a long diameter of the bolt insertion long hole formed in the beam pipe is formed to coincide with a longitudinal direction of the beam pipe.   The bracket has a cylindrical cross-sectional shape in which a U-shaped cross-section portion on the side fixed to the column and a lateral U-shaped cross-section portion on the opposite side are continuous, and the inner sleeve is disposed in the lateral U-shaped cross-section portion of the bracket. The protective fence according to claim 1, wherein the protective fence is fixed to the bracket while being fitted to the bracket.   The upper end surface of the column is inclined at a slope that increases the roadway side, and a cap is placed on the upper end of the column, and this cap has a semicircular shape on the opposite side of the roadway and a U-shaped section on the roadway side when viewed from above. A cylindrical portion that covers the upper end of the support column and an inclined top plate that follows the upper end surface of the support column, and the bracket has an inclined upper surface that is continuous with the inclined top plate of the cap, The bracket fixing bolt that was passed through the cap and the column from the opposite side of the roadway side was screwed into the screw hole provided in the U-shaped cross section on the fixed side of the bracket and tightened to fix the bracket to the column. The protective fence according to claim 5, wherein

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