JP5647018B2 - Guard post - Google Patents

Description

  The present invention relates to a guard post.

  The protection fence for vehicles prevents the fall of the vehicle etc. from a roadway, and has comprised the structure which spanned the horizontal beam (horizontal material) etc. between the some support | pillar standing at predetermined intervals. This type of protective fence absorbs the collision energy of the vehicle by deforming (tilting) the column.

  As for the support | pillar for protection fences, what is equipped with the base fixed to the ground cover etc. of a roadway side, and the support | pillar main body which supports a horizontal beam is common. For example, Patent Document 1 discloses a support fence post in which a pedestal and a support body are integrally formed by casting. Patent Document 2 discloses a support body made of a hollow cylindrical material on the upper surface of the base. There is disclosed a guard fence post which is erected and fixed by welding.

  The protective fence support of Patent Document 1 made of a cast product has a problem that it is difficult to cope with the size change. On the other hand, in the protective fence support of Patent Document 2 that uses a hollow shape, the cross-sectional shape of the support main body (hollow shape) must be uniform in the height direction. Stiffness may be excessive.

  In order to solve such a problem, the applicant of the present application has already applied for a protective fence post using an extruded shape made of an aluminum alloy (Japanese Patent Application No. 2009-170788).

JP 2007-315055 A JP 2007-1332048 A

  In order to prevent a large variation in the amount of collision energy absorbed, it is necessary to improve the reproducibility of the tilted form.

  From such a viewpoint, it is an object of the present invention to provide a protective fence post that uses an extruded profile, and that can improve the reproducibility of the tilted form.

  A first invention that solves such a problem is a protective fence post configured by stacking a plurality of support members made of extruded shapes, each of the support members being in the extrusion direction of the extruded shape Is arranged in a direction along the roadway, and the support member at the bottom is a pedestal, a front flange rising from the pedestal, and a rear flange disposed behind the front flange. And a reinforcing plate that connects the front flange and the rear flange, and the rear flange includes a base that rises from the pedestal and a buckling deformed portion that rises from the upper edge of the base, and the reinforcement The plate rises obliquely upward from the upper end of the base, and when a horizontal load simulating a collision load is statically applied to the upper end of the strut component located at the top, the buckling deformed portion Buckles , Characterized in that.

  Further, a second invention for solving the above-mentioned problem is a support fence post comprising a post-constituting member made of an extruded profile, wherein the prop-constituting material has a direction in which the extrusion direction of the extruded profile follows the roadway And a reinforcing plate that connects the pedestal, a front flange rising from the pedestal, a rear flange disposed behind the front flange, and the front flange and the rear flange The rear flange has a base that rises from the pedestal and a buckling deformed part that rises from the upper edge of the base, and the reinforcing plate rises obliquely upward from the upper end of the base. When the horizontal load simulating the collision load is statically applied to the upper end portion of the column constituting material, the buckling deformed portion is buckled.

  In the present invention, “upper and lower”, “front and rear”, and “left and right” are based on the state where the guard fence support is installed on the side of the roadway, and the side facing the roadway is the “front side”. That is, the direction orthogonal to the roadway (the roadway crossing direction) is the “front-rear direction”, and the direction along the roadway (the longitudinal direction) is the “left-right direction”.

  According to the present invention, when a collision load is applied from the roadway side, the buckling deformation portion of the rear flange is likely to buckle, while the base portion of the rear flange is less likely to buckle or break. Reproducibility increases, and as a result, the amount of collision energy absorbed does not vary greatly. Adjusting the wall thickness and length of the buckled deformed part and the reinforcing plate controls the buckling load (peak load) of the buckled deformed part to an appropriate value. Can be set to

  The reinforcing plate may be formed so that the compressive stress of the reinforcing plate reaches the yield strength before the buckling deformed portion starts buckling deformation. When the compressive stress of the reinforcing plate reaches the yield strength, the function of supporting the rear flange is lowered, so that buckling deformation is likely to occur in the rear flange, and the thickness of the base is changed to the thickness of the buckling deformation portion. If it is larger, the base of the rear flange is less likely to break, so even if the compression stress of the reinforcing plate exceeds the yield strength, absorption of collision energy will continue and the reproducibility of the tilted form will be improved. Can do.

  According to the support fence post according to the present invention, it is possible to improve the reproducibility of the tilted form.

(A) is a side view which shows the support | pillar for protection fences concerning embodiment of this invention, (b) is a front view. (A) is a side view of the upper strut constituent material (upper member), and (b) is a side view of the lower strut constituent material (lower member). (A) is a disassembled perspective view which shows the assembly method of the support | pillar for protection fences, (b) is sectional drawing which shows a junction part. (A) is a side view which shows the state before tilting, (b) is a side view which shows the tilted state. (A) is a graph which shows the result of a loading test, (b) is a side view which shows the dimension of the upper member used for the loading test, (c) is a side view which similarly shows the dimension of a lower member. (A) is a side view which shows the other support | pillar for protection fences concerning embodiment of this invention, (b) is an exploded side view.

  As shown in FIG. 1, the protective fence support A <b> 1 according to the embodiment of the present invention supports the horizontal beams B and B arranged along the roadway, and is installed on the ground cover (foundation) C beside the roadway. Has been.

  The protective fence support A1 is formed by stacking a plurality of (two in this embodiment) support members 1 and 2 made of an aluminum alloy extruded profile. The strut constituent members 1 and 2 are arranged so that the extrusion direction of the extruded shape member that is the element is the direction along the roadway (the direction perpendicular to the paper surface in FIG. 1A).

  In the following description, the upper strut constituent material 1 (the strut constituent material 1 located at the top (uppermost level)) is referred to as “upper member 1”, and the lower strut constituent material 2 (lowermost (lowest (most)). The column-constituting material 2) located in the lower stage is referred to as “lower member 2”.

  The upper member 1 has a shape such that the depth dimension (length in the front-rear direction) gradually decreases as it goes upward. As shown in FIG. 1 (b), the width dimension (length in the left-right direction) of the upper member 1 is constant from the upper end to the lower end.

  The upper member 1 of the present embodiment includes an upper front flange 11, an upper rear flange 12, a front engagement portion 13, a rear engagement portion 14, and a partition plate, as shown in FIG. 15, a beam receiving portion 16, and a beam fixing portion 17.

  The upper front flange 11 faces the roadway, and mainly resists tensile force when a collision load is applied from the roadway side. The upper front flange 11 of the present embodiment is formed in a curved plate shape, and the front surface of the upper front flange 11 is gently curved so as to protrude rearward. The lower end portion of the upper front flange 11 extends below a horizontal plane X1 that passes through the lower end of the upper rear flange 12. The front surface of the lower end portion of the upper front flange 11 is a mounting seat for the lower horizontal beam B.

  A bolt insertion hole 11 a extending from the front surface to the rear surface of the front engagement portion 13 is formed at the lower end portion of the upper front flange 11. A bolt 3a (see FIG. 1), which is a male screw member for fixing a beam, is inserted into the bolt insertion hole 11a. As shown in FIG. 3A, screw insertion holes 11 b and 11 b are also formed in the lower end portion of the upper front flange 11. The screw insertion hole 11b passes through the upper front flange 11 and the front engagement portion 13 on both the left and right sides with the bolt insertion hole 11a interposed therebetween. A countersunk screw 3c (see FIG. 3B), which is a male screw member for joining, is inserted into the screw insertion hole 11b.

  The upper rear flange 12 is disposed behind the upper front flange 11 as shown in FIG. 2A, and mainly resists compressive force when a collision load acts from the roadway side. That is, the upper rear flange 12 is opposed to the upper front flange 11 with a space therebetween, and cooperates with the upper front flange 11 to resist a bending moment at the time of a vehicle collision. The upper front flange 11 of the present embodiment is formed in a curved plate shape, and the rear surface of the upper rear flange 12 is gently curved so as to protrude rearward.

  The front engagement portion 13 is a portion that engages with the upper front portion of the lower member 2, and is attached to the lower end portion of the upper front flange 11. The front side engaging portion 13 of the present embodiment protrudes from the rear surface of the upper front flange 11. The upper surface 13a of the front side engaging portion 13 is inclined so that the front side is lowered.

  The rear engagement portion 14 is a portion that engages with the rear upper portion of the lower member 2, and is attached to the lower end portion of the upper rear flange 12. The upper end portion of the rear engagement portion 14 is connected to the front surface of the lower end portion of the upper rear flange 12, and the lower end portion of the rear engagement portion 14 extends below the upper rear flange 12. The rear engagement portion 14 is offset to the front side with respect to the vertical plane Y1 passing through the lower end of the rear surface of the upper rear flange 12. In addition, a concave groove 14 a that is continuous in the left-right direction (the direction perpendicular to the paper surface) is formed on the rear surface of the rear engagement portion 14. A step surface 14 b is formed at a position one step higher than the lower end surface of the rear engagement portion 14.

  The partition plate 15 is disposed for the purpose of increasing the rigidity of the upper member 1 and has a flat plate shape. The lower partition plate 15 rises obliquely upward from the rear engagement portion 14 and is connected to the upper front flange 11. The upper partition plate 15 rises obliquely upward from the intersection of the upper front flange 11 and the lower partition plate 15 and is connected to the upper rear flange 12. The number, position, orientation, etc. of the partition plate 15 may be changed.

The beam receiving portion 16 and the beam fixing portion 17 are portions serving as mounting seats for the upper horizontal beam B.
The beam receiving portion 16 connects the upper front flange 11 and the upper rear flange 12 at a position lower than the upper end of the upper front flange 11 and the upper end of the upper rear flange 12.
The beam fixing portion 17 projects forward from the upper end of the upper front flange 11. A concave groove is formed on the lower surface of the upper horizontal beam B, and the beam fixing portion 17 is inserted into the concave groove of the horizontal beam B. A bolt insertion hole 17 a is formed in the beam fixing portion 17. A bolt 3b (see FIG. 1A), which is a male screw member for fixing a beam, is inserted into the bolt insertion hole 17a.

  As shown in FIG. 2B, the lower member 2 has a shape such that the depth dimension (length in the front-rear direction) gradually decreases as it goes upward. The width dimension (length in the left-right direction) of the lower member 2 is constant from the upper end to the lower end (see FIG. 1B).

  The lower member 2 of the present embodiment includes a base 20, a lower front flange 21, a lower rear flange 22, a reinforcing plate 23, a wall portion 24, a retaining portion 25, a boundary plate 26, and a blocking portion. 27.

  As shown in FIG. 1A, the pedestal 20 is a flat plate-like portion placed on the ground cover C, and is mounted on the top surface of the ground cover C by anchor bolts C <b> 1 and C <b> 2 planted on the ground cover C. Fixed. In the event of a vehicle collision, a larger pulling force acts on the anchor bolt C1 on the front side than on the anchor bolt C2 on the rear side. Therefore, the anchor bolt C1 on the front side is larger in diameter and longer than the anchor bolt C2 on the rear side. The front half of the pedestal 20 through which the anchor bolt C1 is inserted is formed thicker than the latter half. The front and rear anchor bolts C1 and C2 may have the same diameter. As shown in FIG. 2B, the base 20 is formed with anchor insertion holes 20a, 20a,. Anchor bolts C1 and C2 (see FIG. 1) are inserted through the anchor insertion hole 20a.

  The lower front flange 21 faces the roadway and mainly resists tensile force when a collision load is applied from the roadway side. The lower front flange 21 is disposed below the upper front flange 11, and the upper end surface of the lower front flange 21 is abutted against the lower end surface of the upper front flange 11. The lower front flange 21 of the present embodiment is formed in a curved plate shape, and rises from the front edge of the pedestal 20 in a state inclined to the rear side. The front surface of the lower front flange 21 is gently curved so as to protrude rearward, and is smoothly continuous with the front surface of the upper front flange 11. In addition, the thickness of the lower front flange 21 is gradually reduced as it goes upward, and the thickness of the lower end portion is larger than the thickness of the upper end portion.

  The lower rear flange 22 is disposed behind the lower front flange 21 and mainly resists compressive force when a collision load acts from the roadway side. That is, the lower rear flange 22 is opposed to the lower front flange 21 with a space therebetween, and cooperates with the lower front flange 21 to resist a bending moment during a vehicle collision. The lower rear flange 22 is disposed below the upper rear flange 12, and the upper end surface of the lower rear flange 22 is abutted against the lower end surface of the upper rear flange 12. The lower rear flange 22 of the present embodiment is formed in a curved plate shape, rises from the pedestal 20 in a state inclined to the front side, and opposes the lower front flange 21 in a C shape in a side view. ing. The upper end portion of the lower rear flange 22 extends above a horizontal plane X <b> 2 that passes through the upper end of the lower front flange 21. The rear surface of the lower rear flange 22 is gently curved so as to be convex on the front side, and is smoothly continuous with the rear surface of the upper rear flange 12.

  The lower rear flange 22 includes a base portion 22a, a buckling deformed portion 22b, and an extending portion 22c.

  The base portion 22a rises from the rear edge of the pedestal 20 while being inclined forward so that the separation distance from the lower front flange 21 gradually decreases as it goes upward. The thickness of the base portion 22a is larger than the thickness of the lower front flange 21 and larger than the thickness of the buckling deformation portion 22b.

  The buckling deformed portion 22b rises from the upper edge of the base portion 22a in a state inclined to the front side. The buckling deformed portion 22 b is buckled when a large collision load is applied to the upper end portion of the upper member 1 from the roadway side, and is bent so as to protrude toward the lower front flange 21.

  The extending portion 22c is a portion that is superimposed on the rear side of the rear side engaging portion 14 (see FIG. 2A), and rises from the upper edge of the buckling deformed portion 22b. An engaging protrusion 22d that protrudes forward is formed at the upper end of the extending portion 22c. The engaging protrusion 22d is fitted into the concave groove 14a (see FIG. 2A). Further, a female screw 22e penetrating in the front-rear direction is formed below the engagement protrusion 22d. As shown in FIG. 3B, a set screw 3d is inserted into the female screw 22e. The front end of the set screw 3d abuts on the rear surface of the rear engagement portion 14, and the rear engagement portion 14 is pressed against the blocking portion 27 by tightening the set screw 3d.

  As shown in FIG. 2B, the reinforcing plate 23 is disposed so as to partition the inner space of the lower member 2 vertically, and above the pedestal 20, the lower front flange 21 and the lower rear flange 22. Are connected. The reinforcing plate 23 rises obliquely upward from the upper end portion of the base portion 22 a, and the upper end portion of the reinforcing plate 23 is connected to the upper end portion of the lower front flange 21. In addition, below the reinforcing plate 23, there is no element that partitions the internal space of the lower member 2 up and down. That is, the lower front flange 21 and the base 22 a are connected only by the base 20 and the reinforcing plate 23.

  When a collision load is applied from the roadway side, a compressive stress is applied to the reinforcing plate 23. In the present embodiment, the compression of the reinforcing plate 23 is not performed until the buckling deformed portion 22b starts buckling deformation. The thickness and inclination of the reinforcing plate 23 are set so that the stress reaches the yield strength. The thickness of the reinforcing plate 23 is smaller than the thickness of the buckling deformed portion 22b, and the inclination angle of the reinforcing plate 23 with respect to the horizontal plane is 45 degrees.

  The wall portion 24 is a portion that is superimposed on the rear side of the front engagement portion 13 and rises from the upper end portion of the reinforcing plate 23. In the present embodiment, the wall 24 is vertical, and the angle formed by the reinforcing plate 23 and the wall 24 is 135 degrees. The wall 24 is offset rearward with respect to the vertical plane Y2 passing through the upper end of the front surface of the lower front flange 21.

  The wall portion 24 is formed with a bolt insertion hole 24a penetrating in the front-rear direction. The bolt insertion hole 24a communicates with the bolt insertion hole 11a of the upper member 1 (see FIG. 2A). Bolts 3a (see FIG. 1A) for fixing the transverse beams are inserted through the bolt insertion holes 11a and 24a. The bolt insertion hole 24a may be a simple through-hole or a female screw. However, when the female screw is used, it is necessary to change the fixing method of the lower horizontal beam B. As shown in FIG. 3A, the wall portion 24 is also formed with female screws 24b and 24b. The female screw 24 b is formed on both the left and right sides with the bolt insertion hole 24 a interposed therebetween, and penetrates the wall portion 24. A countersunk screw 3c (see FIG. 3B) passing through the screw insertion hole 11b is screwed into the female screw 24b.

  The retaining portion 25 shown in FIG. 2B is a portion that prevents the upper member 1 from being pulled out upward, and abuts against the upper surface 13a of the front engaging portion 13 (see FIG. 2A). The retaining portion 25 of the present embodiment is located on the extension line of the boundary plate 26 and protrudes forward from the upper end portion of the wall portion 24. The bottom surface of the retaining portion 25 is inclined so that the front side is lowered so that the top surface 13a of the front side engaging portion 13 can be brought into surface contact.

  The boundary plate 26 is disposed above the reinforcing plate 23 and connects the buckling deformed portion 22 b and the wall portion 24. The boundary plate 26 of the present embodiment rises obliquely upward from the upper end portion of the wall portion 24 and is connected to the upper end portion of the buckling deformed portion 22b. When the upper member 1 (see FIG. 2A) is stacked on the lower member 2, the intersection between the buckling deformed portion 22b and the boundary plate 26 becomes the lower partition plate 15 (see FIG. 2A). ) Will be located on the extension line.

  The blocking part 27 is a part that blocks the forward displacement of the upper member 1 (see FIG. 2A), and abuts on the front surface of the rear engagement part 14 (see FIG. 2A). The blocking portion 27 of the present embodiment protrudes from the upper surface of the boundary plate 26 and faces the upper end portion (extending portion 22c) of the lower rear flange 22 with a space therebetween. Note that the upper end surface of the blocking portion 27 is abutted against the step surface 14b (see FIG. 2A) of the rear engagement portion 14.

  In order to manufacture the upper member 1, an extruded shape member (an extruded shape member having two upper and lower hollow parts) having the same cross-sectional shape as the end face shape of the upper member 1 is cut along a surface intersecting the extrusion direction. Bolt insertion holes 11a, 17a, screw insertion holes 11b, etc. may be formed. In addition, as an extruded profile that is the element of the upper member 1, an extruded profile (extruded profile having three hollow portions) in which the front engagement portion 13 and the rear engagement portion 14 are connected by a plate portion is used. Then, the plate portion may be cut out after extrusion. If the front engaging portion 13 and the rear engaging portion 14 are connected to form a hollow portion, the accuracy of extrusion can be increased, and thus the upper member 1 with less dimensional error can be manufactured. Become.

  In order to manufacture the lower member 2, an extruded shape member (an extruded shape member having two upper and lower hollow portions) having the same cross-sectional shape as the end face shape of the lower member 2 is cut along a surface perpendicular to the extrusion direction. An anchor insertion hole 20a, female screws 22e and 24b, a bolt insertion hole 24a, and the like may be formed. Incidentally, the cutting length of this embodiment is the same for both the upper member 1 and the lower member 2.

  In the present embodiment, the width dimension (length in the left-right direction) of the upper member 1 and the lower member 2 is constant from the upper end to the lower end (see FIG. 1B), but the width dimension is downward. If it is cut obliquely so as to be larger, it is possible to form a guard fence post having a wider lower part.

  In order to connect the upper member 1 and the lower member 2, as shown in FIG. 3A, at least one of the upper member 1 and the lower member 2 is slid in the pushing direction (left-right direction), and The wall 24 and the front engaging portion 13 are overlapped on the lower side, and the rear engaging portion 14 is inserted between the extending portion 22c and the blocking portion 27, and then shown in FIG. 3 (b). As described above, the front engagement portion 13 and the wall portion 24 are joined by the countersunk screw 3c that penetrates the front engagement portion 13 and the wall portion 24, and the rear engagement portion 14 is secured by the set screw 3d that penetrates the extension portion 22c. What is necessary is just to press the front surface of this against the blocking part 27. The upper member 1 and the lower member 2 may be assembled in advance at a factory or the like, or may be assembled at the place where the protective fence support A1 is installed. Although not shown, the upper member 1 and the lower member 2 may be joined by welding, friction stir welding, adhesion, or the like.

  In order to fix the protective fence post A1 to the ground cover C, as shown in FIG. 1 (a), the anchor fence C1 and C2 protruding from the ground cover C are passed through the anchor insertion hole 20a while the protective fence post is fixed. A1 may be installed on the ground cover C, and nuts may be screwed onto the anchor bolts C1 and C2 protruding from the pedestal 20.

  In order to attach the upper horizontal beam B to the protective fence support A1, after placing the horizontal beam B on the beam receiving portion 16 and the beam fixing portion 17, the bolt 3b is inserted into the bolt insertion hole 17a from the lower side of the beam fixing portion 17. And the horizontal beam B may be fixed to the beam fixing portion 17 using the bolt 3b. The beam fixing portion 17 is inserted into the concave groove on the lower surface of the horizontal beam B, and the rear portion of the horizontal beam B is a recess at the upper end portion of the upper member 1 (the beam receiving portion 16 serves as a bottom wall and the upper front flange 11 The upper end portion and the upper end portion of the upper rear flange 12 are fitted into a recess).

  Further, in order to attach the lower horizontal beam B to the protective fence support A1, the lower end of the upper front flange 11 is passed through the bolt insertion holes 11a and 24a (see FIG. 2) while the bolt 3a held by the rear portion of the horizontal beam B is passed through. The lower cross beam B may be brought into contact with the front surface of the portion (the overlapping portion of the front engaging portion 13 and the wall portion 24), and a nut may be screwed into the bolt 3a protruding to the rear side of the wall portion 24. In addition, the front side engaging part 13 and the wall part 24 are joined also by the volt | bolt 3a.

  As shown in FIG. 4A, when a rearward collision load acts on the upper end of the protective fence post A1, the protective fence post A1 is deformed or tilted. When the compressive stress of the reinforcing plate 23 reaches the yield strength, the buckling deformed portion 22b is bent so as to bulge out toward the lower front flange 21 as shown in FIG. Buckling deformation starts and overlaps with the reinforcing plate 23. Since the portion where the buckling deformed portion 22b and the reinforcing plate 23 overlap each other is in a state like a stacked beam, an appropriate deformation resistance is maintained even after the buckling deforming portion 22b is buckled. The base portion 22a is tilted forward due to the bending deformation generated at the lower end portion thereof, and the reinforcing plate 23 is bent at the end portion on the base portion 22a side. The upper member 1 is not greatly deformed, such as buckling, and tilts backward while maintaining the original shape. In addition, since a tensile force acts on the front part (upper front flange 11 and lower front flange 21) of the protective fence post A1, the boundary between the upper front flange 11 and the lower front flange 21 Although the force which tries to separate both acts, since the upper surface of the front side engaging part 13 of the upper member 1 contacts the retaining part 25 of the lower member 2, the upper member 1 does not separate from the lower member 2.

FIG. 5A shows the relationship between the load and the amount of displacement when a horizontal load simulating a collision load is applied statically to the upper end of the protective fence post A1 (the upper end of the upper member 1). . This static load test was described in “Method for designing beam guard fences for bridges” (p. 98-100) of “Protection fence installation standards / comment January 2008” (Japan Road Association). Complies with test method.
The aluminum alloy of the protective fence support A1 used for the test is JIS A6061S-T6. The thickness and height of each part of the upper member 1 are as shown in FIG. 5B, and the thickness and height of each part of the lower member 2 are as shown in FIG. 5C. is there. The width of the upper member 1 and the lower member 2 is 150 mm.

When the horizontal load was gradually increased, the maximum (maximum supporting force P _max = 44.9 kN) was reached when the displacement of the upper end exceeded 50 mm. When the ultimate supporting force P _W is calculated based on the equivalent trapezoid area (= the value obtained by integrating the displacement load curve in the region of 0 to 30 cm), P _W = 29.6 kN. Compressive stress of the reinforcing plate 23 reaches the yield strength before reaching the maximum bearing capacity P _max, buckling occurs in buckling deformation portion 22b in the maximum supporting force P _max. Since the load at the time when the displacement of the upper end of the protective fence post A1 reaches 30 cm is about 19 kN, the protective fence post A1 sufficiently withstands the impact load at the time of vehicle contact / collision, and the predetermined collision It turns out that it has the characteristic which can absorb energy.
Note that the tilting form and supporting force of the protective fence support A1 at the time of the vehicle collision correlate with the result of the static load test, and can be estimated without depending on the collision test. Also in the “Protective fence performance confirmation test method for vehicles (Notice of Road Environment Division, Ministry of Construction, November 5, 1998)” attached to the above “Protection fence installation standards and explanation January 2008” It is described that it is possible to replace the collision test by confirming the strength of the structural members of the protective fence by a static load test.

  According to the protective fence post A1 configured as described above, when a collision load is applied from the roadway side, the buckling deformation portion 22b is likely to buckle, while the base portion 22a is unlikely to buckle or break. As a result, the reproducibility of the tilted form is enhanced, and as a result, the amount of collision energy absorbed is less likely to vary. The buckling deformation mode can be easily controlled by adjusting the thickness and length of the buckling deformation portion 22b and the reinforcing plate 23.

Further, after the compressive stress of the reinforcing plate 23 reaches the yield strength, the buckling deformation portion 22b starts buckling deformation, so that the buckling load (maximum support force _Pmax ) of the buckling deformation portion 22b increases. As a result, the amount of collision energy absorbed can be increased. In addition, since the thickness of the base portion 22a is larger than the thickness of the buckling deformed portion 22b, the base portion 22a is not easily broken, and therefore the collision occurs even when the compressive stress of the reinforcing plate 23 exceeds the yield strength. Energy absorption continues and the reproducibility of the tilted form can be improved. It should be noted that the buckling deformation (cross-sectional crushing) mode and the collision energy absorption amount of the upper member 1 and the lower member 2 can be easily simulated by numerical analysis.

  Moreover, according to the protective fence post A1, the upper surface of the front engaging portion 13 of the upper member 1 abuts against the retaining portion 25 of the lower member 2, so that the upper member 1 and the lower member 2 are firmly joined. become. That is, according to the protective fence support A1, the upper member 1 is not detached from the lower member 2 even when it is tilted rearward, and the collision energy at the time of the vehicle collision can be reliably absorbed.

  Furthermore, in the protective fence post A1, the front side engaging portion 13 and the wall portion 24 are joined by the bolt 3a and the countersunk screw 3c, so that the front side engaging portion 13 and the retaining portion 25 are engaged with each other. As a result, the upper member 1 and the lower member 2 are more firmly joined, and further, the lateral displacement of the upper member 1 and the lower member 2 can be prevented.

  In addition, when the bolt 3a for beam fixation is used for joining the front side engaging portion 13 and the wall portion 24 and the flat head screw 3c is omitted, the number of male screw members can be reduced, thereby reducing the cost. Can be achieved.

  Further, according to the protective fence support A1, the front surface of the rear engagement portion 14 is pressed against the blocking portion 27 by the set screw 3d, so that rattling can be prevented. Further, when the protective fence post A1 tilts backward, the blocking portion 27 prevents the upper rear flange 12 from moving forward, so that the upper rear flange 12 and the lower rear flange 22 The abutted state is maintained, so that the compressive force acting on the upper member 1 is reliably transmitted to the lower member 2.

  Further, according to the protective fence support A1, the end face shapes (small edge shapes) of the upper member 1 and the lower member 2 become accents of the appearance design, so that the appearance design is less likely to be monotonous. Further, when the guard fence post A1 is visually recognized from the passenger compartment of the automobile traveling on the roadway, the other side of the guard fence post A1 can be seen through the hollow portions of the upper member 1 and the lower member 2, so that it is wide. Since the field of view can be secured and the feeling of pressure can be reduced, safety can be improved and driving can be enjoyed. In addition, when not using as an external design, you may cover the cover material on the side surface of the upper member 1 and the lower member 2. FIG. The lid material may be a structural material or a simple decorative member (non-structural material).

  In addition, according to the protective fence support column A1, the height dimension, the size of the buckling load, and the like can be easily changed simply by changing the type of the extruded profile to be combined. For example, when it is desired to increase the buckling load, an extruded profile having a large thickness may be used. Note that the rigidity and strength (buckling load and load resistance) of the protective fence column A1 can also be changed by changing the cutting length of the extruded shape member to increase or decrease the width dimension of the column member.

  Further, according to the protective fence support A1, since the pedestal 20 is integrally formed with the lower member 2, it is not necessary to prepare a pedestal member separately. That is, according to the protective fence support A1, the work of joining the lower member 2 and the pedestal member becomes unnecessary, so that it is possible to reduce labor and cost required for manufacturing the protective fence support A1.

  In the present embodiment, after the extruded member is cut to a predetermined length to obtain the upper member 1 and the lower member 2, the protective fence support A1 is manufactured by stacking them. The protective fence support A1 may be manufactured by cutting an assembly obtained by joining the extruded profile and the extruded profile that is the element of the lower member 2. When manufacturing the protective fence support A1 installed on the horizontal installation surface, the assembly is cut along a surface orthogonal to the pushing direction, and the protective fence support A1 installed on the inclined installation surface. Is manufactured, the assembly is cut along a plane inclined at an angle equal to the inclination angle of the installation surface with respect to the plane orthogonal to the extrusion direction.

  In the present embodiment, the upper front flange 11, the upper rear flange 12, the lower front flange 21, and the lower rear flange 22 are illustrated as curved plates. However, FIG. In this way, it may be formed into a folded plate shape (a shape in which flat plates are connected). Note that each of the folding point m1 of the upper front flange 11 and the folding point m2 of the upper rear flange 12 is located at the intersection with the upper partition plate 15, and two upper and lower portions of the lower front flange 21. Among the folding points m3 and m4, the lower folding point m3 is located on the way from the base 20 to the reinforcing plate 23, and the upper folding point m4 is located at the intersection with the reinforcing plate 23. Further, the folding point m5 of the lower rear flange 22 is located at the intermediate portion in the height direction of the buckling deformed portion 22b.

  Moreover, in this embodiment, although the case where the lower end part of the upper side front flange 11 and the front side engaging part 13 were piled up on the wall part 24 was illustrated, as shown to (a) of FIG. 13 may be superposed on the upper end 21 a and the wall 24 of the lower front flange 21. That is, as shown in FIG. 6B, the upper end 21a and the wall 24 are opposed to each other by extending the upper end 21a of the lower front flange 21 above the intersection with the reinforcing plate 23. In addition, the front engagement portion 13 extended below the upper front flange 11 may be inserted between the upper end portion 21 a and the wall portion 24. If it does in this way, it will be in the state where the front side engaging part 13 was clamped by the upper end part 21a and the wall part 24, and when the protective fence support | pillar A2 inclines back, the front surface of the front side engaging part 13 will be a lower side. Since it abuts against the upper end portion 21a of the front flange 21 and restrains the rotation of the front engaging portion 13, even if the guard fence post A2 is largely inclined backward, the upper member 1 and the lower member 2 Opening is less likely to occur at the boundary portion, and it is possible to maintain a good engagement between the two. The lower horizontal beam is attached to the front surface of the upper end 21 a of the lower front flange 21.

  Further, in the present embodiment, the case where the protective fence support A1 is formed of two support members (upper member 1 and lower member 2) is exemplified, but the number of support members is not intended to be limited. Although illustration is omitted, it may be composed of a single strut constituent material, or may be constituted by stacking three or more strut constituent materials.

A1, A2 Guard fence post 1 Upper member (top post component)
2 Lower member (lowermost strut component)
20 Base 21 Lower front flange (front flange)
22 Lower rear flange (rear flange)
22a Base part 22b Buckling deformation part 23 Reinforcement plate 25 Detachment part 27 Prevention part

Claims (3)

A protective fence post constructed by stacking a plurality of prop constituent members made of extruded shapes,
Each strut component is arranged such that the extrusion direction of the extruded profile is in the direction along the roadway,
The strut component located at the bottom includes a pedestal, a front flange rising from the pedestal, a rear flange disposed behind the front flange, and a reinforcement connecting the front flange and the rear flange. A plate,
The rear flange has a base that rises from the pedestal, and a buckling deformation part that rises from the upper edge of the base,
The reinforcing plate rises obliquely upward from the upper end of the base,
A support fence post characterized in that, when a horizontal load simulating a collision load is applied statically to the upper end portion of the support member constituting the top, the buckling deformed portion buckles. A support fence post comprising a post component made of an extruded profile,
The strut component is disposed such that the extrusion direction of the extruded shape is along the roadway, and is disposed behind the pedestal, the front flange rising from the pedestal, and the front flange. A rear flange, and a reinforcing plate that connects the front flange and the rear flange,
The rear flange has a base that rises from the pedestal, and a buckling deformation part that rises from the upper edge of the base,
The reinforcing plate rises obliquely upward from the upper end of the base,
A protective fence post, wherein the buckling deformed portion buckles when a horizontal load simulating a collision load is statically applied to the upper end portion of the post constituent material. The reinforcing plate is formed such that the compressive stress of the reinforcing plate reaches the yield strength before the buckling deformed portion starts buckling deformation,
The support fence post according to claim 1, wherein a thickness of the base portion is larger than a thickness of the buckling deformed portion.

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