JP6663720B2 - Flexible grid panel, its support connection structure, and protective fence - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective fence provided with a free grid panel that can be installed even on a slope, and in particular, a snow-resistant free grid panel capable of withstanding a snow load when snow falls on the grid panel, the snow-resistant free grid panel and a pillar. And a protection fence provided with the snow-resistant free grid panel and the pillar connection structure.

  2. Description of the Related Art Conventionally, a protective fence provided with a free grid panel that can be installed on a slope is known. For example, Patent Literature 1 discloses that a metal fitting 5 can be interposed between standing pillars 1 for the purpose of providing a pipe fence with a good appearance while being applicable to not only flat terrain such as roads and parks but also sloped lands. The left and right frame pipes 8 and 9 to be attached and mounted, the upper and lower frame pipes 6 and 7 provided above and below the left and right frame pipes 8 and 9, and the left and right frame pipes 6 to 9 A pipe fence 2 composed of vertical pipes 10 provided at predetermined intervals in parallel with the frame pipes 8, 9, wherein the left and right frame pipes 8, 9 and the vertical pipe 10 are provided with connecting members at their pipe ends. The connecting member 3 is loosely inserted into the openings 11 provided at predetermined intervals in the pipe walls of the upper and lower frame pipes 6 and 7, and the retaining members provided on the upper and lower frame pipes 6 and 7 are retained. It is stopped by the member 4 A pipe fence 2 connected to upper and lower frame pipes 6 and 7 is disclosed (Claim 1 of Claims of Patent Document 1, paragraphs [0011] to [0019] of the specification, drawings of drawings) 1, FIG. 2 etc.).

  However, in the pipe fence of Patent Document 1, the metal fittings 18 welded to the side faces of the left and right frame pipes 8 and 9 are horizontally moved and fitted into the metal fittings 17 welded to the side faces of the column 1, and are vertically inserted. Since it is fixed by the pin 19 inserted in the direction, for example, a load applied to the fence, such as a snow load, is transmitted to the metal fittings 18 and 17 as a shearing force, and eventually, the shearing force (bearing force) of the pin 19. It has a problem of insufficient strength when installed in a snowy area.

  Further, the pipe fence disclosed in Patent Literature 1 can deform the frame into a rhombus shape and can be installed on a slope, but the clearance between the bracket 17 of the support 1 and the bracket 18 of the frame pipes 8 and 9 is small, and the pipe fence is caused by construction errors. There is a problem that it is not possible to absorb the expansion and contraction of the span between the columns and the difference in the mounting interval due to the oblique mounting along the inclined surface.

  In addition, in the pipe fence of Patent Document 1, the metal fittings 18 attached to the side surfaces of the left and right frame pipes 8 and 9 are horizontally moved and fitted into the metal fittings 17 attached to the side surfaces of the column 1, Since the pins are fixed, the fence panel cannot be temporarily placed between the supports by one worker, and there is a problem that unnecessary labor costs are required for the fence installation work, which is uneconomical.

  Further, Patent Document 2 discloses that the vertical grid is stably and firmly held between the upper and lower body edges by using the same type of spacing material regardless of the thickness of the end of the vertical grid. In order to provide an assembling structure of the protective fence that can effectively assemble the fuselage by the material, the protective fence 1 has a fuselage 20 and a vertical lattice panel 30 connecting the two fuselages 20. The body edge 20 has a slit 21 s extending over the entire length, and a vertical lattice panel support portion 22 that opens in an inverted wedge shape from both edges of the slit 21 s toward the inside. It has a vertical grid 31 arranged side by side in the longitudinal direction of the edge 20 and a spacing member 32 for maintaining the vertical grid 31 at equal intervals. Further, the spacing member 32 has a vertical lattice holding portion 32a connected to an end of the lattice 31 and a waist-shaped engaging portion 32b that engages with the vertical lattice panel supporting portion 22 in a wedge shape. For this reason, the body edge engaging portion 32b of the spacing member 32 is pressed against the vertical grating panel support portion 22 of the body edge 20 by the load of the vertical grid panel 30, so that the spacing material 32 is in contact with the body edge 20 by a wedge effect. An assembling structure of a protective fence that is integrated and the trunk 20 is reinforced by the spacing member 32 is disclosed (Claim 1 of Claim of Patent Document 2, paragraphs [0018] to [0028] of the specification). , FIG. 1 of the drawings, etc.).

  However, the assembly structure of the protective fence disclosed in Patent Document 2 can stably and firmly hold the vertical grid using the same type of spacing material regardless of the thickness of the end of the vertical grid. However, it is not able to withstand a load acting directly on the waist edge 20 such as a load, and is not taken into consideration, and there is a problem that the strength is insufficient when installed in a snowy area.

  Further, similarly to the pipe fence of Patent Document 1 described above, the assembly structure of the protective fence of Patent Document 2 reduces the difference in the mounting interval due to the expansion and contraction of the span between the columns due to construction errors and the oblique mounting along the inclined surface. It could not solve the problem that it could not be absorbed and the problem that it was not possible to perform temporary placement work by one person.

JP 2004-84379 A JP-A-2005-52252

  Therefore, the present invention has been devised in view of the above-mentioned problem, and an object thereof is to prevent the strength from being insufficient even under the snow load, and to expand and contract the span between the columns due to a construction error. To provide a flexible lattice panel, a flexible lattice panel support connection structure, and a protective fence that can absorb the difference in the mounting interval due to the above and can reduce the labor cost of the installation work while being able to temporarily place the work. is there.

  The free lattice panel according to the first invention comprises a pair of upper and lower upper and lower frame members, and a pair of left and right vertical frame members whose upper and lower ends are rotatably mounted on the upper and lower frame members. A plurality of lattice members whose upper and lower ends are rotatably mounted on the upper frame member and the lower frame member, and a middle member is inserted into the upper frame member, On the side surfaces of the pair of vertical frame members, a U-shaped cross-section connecting bracket is attached, which is connected to the protruding bracket protruding from the support fence side of the protective fence from above. .

  In the flexible lattice panel according to a second aspect of the present invention, in the first aspect, the middle member has a height reaching from near an upper end to a lower end of an inner surface of the upper frame member, and upper and lower edges thereof are connected to the upper frame. It is characterized by being bent at an acute angle along the inner surface of the material.

  According to a third aspect of the present invention, in the flexible lattice panel according to the first or second aspect, the connecting fitting has a column connecting long hole through which a connecting member such as a bolt or a rivet for connecting to the protruding fitting is inserted. The strut connection elongated hole is provided in the vertical direction and is elongated in the fence width direction orthogonal to the axis of the vertical frame member.

  A flexible lattice panel according to a fourth invention is the flexible lattice panel according to any one of the first invention to the third invention, wherein the upper frame material and the lower frame material are connected to the vertical frame material at an upper end of the vertical frame material. And a frame connection elongated hole formed near the lower end thereof, and the frame connection elongated hole is elongated in a fence width direction orthogonal to the axis of the vertical frame material, and both ends of the intermediate material. Is characterized in that a round hole is formed, a connecting member such as a bolt or a rivet is inserted through the round hole, and the upper frame member is fixed to the vertical frame member.

  According to a fifth aspect of the present invention, in the flexible lattice panel according to any one of the first to fourth aspects, the connection fitting is welded to the vertical frame member, and a welding line is formed in the axial direction of the vertical frame member. It is characterized in that a straight portion along the length is longer than other portions.

  A support connection structure for a flexible lattice panel according to a sixth aspect of the present invention is a support connection structure for a plurality of supports and a flexible lattice panel stretched between the supports and connected so that the relative angle between the members can be changed. The free lattice panel comprises a pair of upper and lower upper and lower frame members, a pair of left and right vertical frame members whose upper and lower ends are rotatably mounted on the upper and lower frame members, A plurality of grid members whose upper and lower ends are rotatably mounted on the frame member and the lower frame member, and protruding metal fittings connected to the free grid panel are provided on the side surfaces of the support posts. A middle member is inserted into the upper frame member, and a side surface of the pair of vertical frame members has a U-shaped cross section for covering and connecting the protruding metal fittings from above. It is characterized in that connection fittings are protruded.

  According to a sixth aspect of the present invention, in the sixth aspect of the present invention, the connection fitting has a support connection elongated hole through which a connection member such as a bolt or a rivet for connecting to the protruding fitting is inserted. The strut connection elongated hole is provided in the vertical direction and is elongated in the fence width direction orthogonal to the axis of the vertical frame member.

  According to an eighth aspect of the present invention, in the support structure for supporting a flexible grid panel according to the sixth or seventh aspect, the connecting member such as a bolt or a rivet for connecting to the connection fitting is inserted into the protruding fitting. A connection slot is provided, and the panel connection slot is vertically opened and is elongated in a fence width direction orthogonal to the axis of the column.

  According to a ninth aspect of the present invention, in the support structure for a flexible grid panel according to any one of the sixth to eighth aspects, the connection between the upper frame material and the lower frame material and the vertical frame material is performed in the vertical frame material. It is connected via a frame connection long hole drilled near the upper end and the lower end of the frame material, and the frame connection long hole is elongated in a fence width direction orthogonal to the axis of the vertical frame material. I do.

  According to a tenth aspect of the present invention, in the ninth aspect of the present invention, in the ninth aspect, round holes are formed in both ends of the intermediate member, and connecting members such as bolts and rivets are inserted into the round holes. Further, the upper frame member is fixed to the vertical frame member.

  According to an eleventh aspect of the present invention, in the support structure for supporting a snow-resistant free grid panel according to any one of the sixth to tenth aspects, the connection fitting is welded to the vertical frame member, and the protruding fitting includes Each of the welding lines is welded to the column, and a straight line portion along the axial direction of the vertical frame member or the column is longer than other portions.

  The protective fence according to the twelfth invention is a protective fence for preventing crossing and falling, and the snow-resistant free grid panel according to any one of claims 1 to 5 is freely adjustable according to any one of claims 6 to 11. It is characterized in that it is connected to the column by the column connection structure of the lattice panel.

  According to the first invention to the twelfth invention, since the middle material for providing the bending strength that can withstand the snow load is inserted into the upper frame material, the bending strength is improved by the middle material, and the snow load is increased. The strength is not insufficient. According to the first invention to the twelfth invention, on the side surfaces of the pair of vertical frame members, a U-shaped cross section is connected by being covered from above with the protruding metal fittings protruding from the support fence side surfaces of the protective fence. Since the connection metal fittings are mounted, the flexible grid panel can be temporarily placed on the protruding metal fittings of the column, and the entire panel installation work can be performed by a single worker. For this reason, labor costs for panel installation work can be reduced.

  In particular, according to the second invention, the middle material has a height reaching from near the upper end to near the lower end of the inner surface of the upper frame material, and the upper and lower edges thereof are bent at an acute angle along the inner surface of the upper frame material. Since the cross section of the middle member can be intensively arranged at a long distance from the neutral axis in the upper frame material, the second moment of area and the section modulus can be improved to reduce the weight. it can. For this reason, the bending strength can be further improved and the strength against the snow load can be secured.

  In particular, according to the third invention and the seventh invention, since the strut connection long hole is a long hole in the fence width direction, the difference between the mounting intervals due to the inclination when installed on a sloped land and when installed on a flat ground is reduced. Can be absorbed. Similarly, according to the eighth aspect, since the panel connection long hole is a long hole in the fence width direction, the difference in the mounting interval due to the inclination can be further absorbed.

  In particular, according to the fourth and ninth inventions, since the frame connection long holes provided near the upper and lower ends of the vertical frame material are long holes in the fence width direction, expansion and contraction of the span between the columns due to construction errors. Can be absorbed.

  In particular, according to the fifth invention and the eleventh invention, the vertical portion of the welding line or the linear portion along the axial direction of the column is longer than the other portions, so that the snow load is reduced. Even if it acts as an axial force, it acts only as a shearing force in accordance with the axial force on the straight line along the axial direction of the vertical frame material or column of the welding line, and the bending moment around the welding line As described above, it is minimized that the axial force is amplified by the principle of leverage and transmitted to the welded portion. For this reason, the possibility that stress concentrates on the welded portion, which is a weak point in strength, is reduced, and the strength against snow load can be further improved.

  In particular, according to the tenth invention, since the middle member inserted into the upper frame member for the purpose of reinforcing the bending strength has only a small-diameter round hole, not a long hole, as a hole having a cross-sectional defect, Further, the bending strength can be further improved to secure the strength against the snow load.

It is a front view showing the state where the protection fence concerning an embodiment of the present invention was seen in the horizontal direction orthogonal to the fence width direction. It is a perspective view which shows the upper part of the support | pillar of the same protective fence. It is a front view which shows the state which stood on the ground on the same pillar. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the snow-resistant type free grid panel which is the free grid panel which concerns on embodiment of this invention. It is a partial expansion perspective view which shows the right end of the upper frame material of the same snow-resistant type free grid panel. It is sectional drawing which shows the state which cut | disconnected the upper frame material and the middle material of the said snow-resistant type free grid panel by the plane orthogonal to an axis | shaft. It is a front view which shows the upper frame material same as the above with an intermediate omission. FIG. 3 is a partially enlarged perspective view showing a right end of a lower frame member of the snow-resistant free grid panel of the above. It is sectional drawing which shows the state which cut | disconnected the lower frame material and the middle material of the said snow-resistant type free grid panel by the plane orthogonal to an axis | shaft. It is a partial expansion perspective view which shows the right end of the middle material of the same snow resistant type free grid panel. It is a front view which shows the middle material same as the above with an intermediate omission. It is a perspective view which shows the upper part of the vertical frame material of the same snow resistant type free lattice panel. It is a figure which shows the same vertical frame material, (a) is a right view, (b) is a front view. It is a top view which shows the same vertical frame material. It is a perspective view which shows the upper part of the grid material of the same snow resistant free grid panel. It is a figure which shows the said grid material, (a) is a right view, (b) is a front view. It is explanatory drawing which shows the temporary installation construction on the support | pillar of the said snow-resistant type free grid panel by a perspective view.

  Hereinafter, a protective fence according to an embodiment of the present invention, its flexible lattice panel, and a support connection structure of the flexible lattice panel will be described in detail with reference to the drawings.

  As shown in FIG. 1, a protective fence 1 according to an embodiment of the present invention includes a plurality of columns 2, and a snow-resistant type flexible grid panel stretched between these columns 2 according to the embodiment of the present invention. It is composed of a lattice panel 3 and the like.

(Post)
As shown in FIGS. 2 and 3, the column 2 includes a column main body 20 formed of a circular steel pipe, a cap 21 that closes an upper end opening of the column main body 20, and a left and right upper and lower side from the side peripheral surface of the column main body 20. (Horizontal direction) and the like.

  The main body 20 is a steel pipe having a thickness (t = 3.2 mm), a diameter (φ = 60.5 mm), and a height of 1300 mm made of a carbon steel pipe for general structural use (STK400 Z27). Then, the ground part becomes a column main body with a height of 1100 mm.

  The cap 21 is a steel dome-shaped member. The cap 21 is closed so that the pipe end of the support body 20 is not exposed, so that a sharp cut surface does not injure a person. It has a function to prevent intrusion and prevent rust.

  The protruding fitting 22 is a fitting formed by bending a steel plate having a thickness (t = 3.2 mm) and a width of 35 mm to form a panel connection long hole 23 for connecting a snow-resistant flexible lattice panel 3 described later. . The panel connection long hole 23 is 14 mm × 25 mm long in the fence width direction X (refers to a direction along a line connecting the centers of the columns 2, which is orthogonal to the axis of the column 2, which is vertically opened). It is a long hole.

  The protruding metal fitting 22 is configured such that the end face of the steel plate abuts on the side peripheral surface of the supporting column main body 20 at a height of 193 mm and 828 mm from the upper end of the supporting column main body 20 without providing a groove. Both sides of the sheet surface of the steel sheet to be welded are welded by fillet welding. That is, the welding line at which the protruding metal fitting 22 is welded to the column main body 20 is linear along the axial direction of the column main body 20.

  For this reason, even when snow is piled up on the snow-resistant free grid panel 3 connected to the protruding metal fitting 22, the snow load does not act as a bending moment on the welding line, but only as a shearing force along the welding line. Does not work. Therefore, the snow load is not amplified and transmitted by the principle of leverage as in the bending moment with the welding line as an axis. Strength against a load can be improved.

  Moreover, although the support | pillar 2 which concerns on embodiment of this invention demonstrated and demonstrated the support | pillar of the intermediate part in which the protrusion fitting 22 protruded on both sides of the fence width direction X, the support | pillar located in the edge part of a fence was used. Naturally, the protruding metal fitting 22 protrudes only on one side in the fence width direction X.

<Free grid panel>
As shown in FIG. 4, a snow-resistant free grid panel 3, which is a free grid panel according to an embodiment of the present invention, has a pair of upper and lower upper frames 4 and 5, a pair of upper frames 4 and lower frames. 5, a pair of left and right vertical frame members 6 and 7 having upper and lower ends rotatably mounted on a shaft, and a plurality of lattices having upper and lower ends rotatably mounted on an upper frame member 4 and a lower frame member 5. Material 8 and the like.

(Upper frame material, lower frame material)
The upper frame member 4 and the lower frame member 5 are bent from a hot-dip galvanized steel plate (SGC400-ZSMO Z27) as shown in FIGS. The groove 4a, 5a through which the end portion of the groove 8 is inserted is opened, and is a 1880 mm long strip having a polygonal cross section in a bulb shape. The upper frame member 4 is installed along the upper end of the protective fence 1 with the horizontal direction as the longitudinal direction, and also functions as a handrail shade.

  At both ends of the upper frame member 4 and the lower frame member 5, round holes 4b, 4c, 5b, and 5c each having a height of 14 mm × a width of 16 mm and being slightly laterally (fence width direction X) are formed. . A connecting member, which is an M12 bolt, is inserted into these round holes 4b, 4c, 5b, 5c, and the vertical frame members 6, 7 are rotatably (swingably) connected. For this reason, the relative angles of the upper frame member 4 and the lower frame member 5 and the vertical frame members 6 and 7 can be changed, and it is easy to follow the slope of the sloping ground.

  Of course, the connecting member is not limited to the M12 bolt, and may be any connecting member that rotatably connects other members such as bolts, pins, or rivets.

  In addition, unlike the upper frame member 4, four drain holes (not shown) having a pitch of 500 mm and a diameter of 8 mm are formed on the bottom surface of the lower frame member 5 at a pitch of 500 mm to drain rainwater or the like that has entered through the groove 5 a. Have been.

(Middle material)
As shown in FIGS. 6 and 9, a pair of left and right middle members 9 and 9 ′ are inserted into the upper frame member 4 and the lower frame member 5 in order to secure a bending strength that can withstand a snow load. . As shown in FIGS. 10, 6, and 9, the middle members 9, 9 are bent from a hot-dip galvanized steel sheet (SGC400-ZSMO Z27) having a thickness of 2.3 mm, and have upper edges 9a, 9a '. , Lower edge portions 9 b and 9 b ′ are bent at acute angles along the inner surfaces of the upper frame member 4 and the lower frame member 5.

  As shown in FIGS. 6 and 9, the middle members 9 and 9 ′ are bent slightly at the center of the cross section at a retreat distance of about 2 mm and an angle of 161 °, and the upper plate surface is the upper frame member 4 or the lower plate. It is flush with the inner surfaces of the grooves 4a, 5a of the frame member 5.

  For this reason, the total height of the middle members 9, 9 'is 43 mm reaching from the vicinity of the upper end to the lower end of the inner surfaces of the upper frame member 4 and the lower frame member 5, and the axial direction of the middle members 9, 9' (longitudinal). Direction), the upper edges 9a, 9a 'and the lower edges 9b, 9b' are located away from the neutral axis, thereby improving the second moment of area and the section modulus to reduce the weight. be able to. Therefore, the bending strength of the middle member 9, the upper frame member 4, and the lower frame member 5 can be improved, and the strength against the snow load can be secured.

  At both ends of the middle members 9, 9 ', 14 mm height × 14 mm × 4 holes are formed at positions corresponding to the round holes 4b, 4c, 5b, 5c formed at both ends of the upper frame member 4 and the lower frame member 5. Long circular holes 90 and 90 'having a width of 20 mm and being slightly lateral (fence width direction X) are formed. The M12 bolts described above are inserted into the round holes 90 and 90 ', and the vertical frame members 6 and 7 are rotatably stopped.

  The middle members 9, 9 'are provided with 11 5.5 mm diameter pin holes 91, 91' for pinning (riveting) the lattice member 8 at a pitch of 158mm.

  As described above, the holes formed in the middle members 9, 9 'are made as small as possible so as not to have a cross-sectional defect in view of the fact that the middle members 9, 9' are reinforcing members that enhance bending strength and increase rigidity. For this reason, desired strength and rigidity can be ensured for the upper frame member 4 and the lower frame member 5 with respect to the snow load, and the vertical frame members 6, 7 and the grid member 8 to be connected can be reliably sandwiched.

(Vertical frame material)
The vertical frame members 6 and 7 are arranged at a height corresponding to the vertical frame main bodies 60 and 70 made of a steel pipe and the protruding metal fitting 22 from the side peripheral surfaces of these vertical frame main bodies 60 and 70 in the fence width direction X outside. And fittings 61, 71 and the like protruding toward the connector.

  The vertical frame bodies 60 and 70 are steel pipes (t = 2.3 mm), diameter (φ = 34 mm), and total height 925 mm made of carbon steel pipes for general structural use (STK400 ZSMO Z27). , 70a and lower ends 60b, 70b are crushed and flattened to a length of about 61 mm.

  The flat upper end portions 60a and 70a and the lower end portions 60b and 70b have frame connection long holes 60c, 70c, 60d through which the above-mentioned M12 bolts for connecting to the upper frame member 4 or the lower frame member 5 are inserted. 70d are respectively drilled. These frame connection long holes 60c, 70c, 60d, 70d are long holes having a height of 14 mm and a width of 35 mm long in the fence width direction X orthogonal to the axis of the vertical frame members 6, 7.

  For this reason, by adjusting the bolting position in the width direction of the frame connection long holes 60c, 70c, 60d, and 70d, which are long holes, the span between the columns due to the construction error, that is, the column 2 It is possible to absorb a difference in length between the columns caused by an error in the installation position or a defect in the vertical accuracy of the column 2.

  Each of the connection fittings 61 and 71 is a steel member having a U-shaped cross section with an opening having a height of 38.2 mm × a total width of 36.7 mm and a total length of 53.8 mm. As shown in FIG. 12, the connection metal fittings 61 and 71 are provided with grooves on the side peripheral surfaces of the vertical frame main bodies 60 and 70 and are brought into contact with each other. ing. That is, the welding lines where the connection fittings 61 and 71 are welded to the vertical frame main bodies 60 and 70 are linear along the axial direction of the vertical frame main bodies 60 and 70.

  For this reason, even when snow accumulates on the snow-resistant free grid panel 3, the snow load does not act as a bending moment on the welding line but acts only as a shearing force along the welding line. Therefore, the snow load is not amplified and transmitted by the principle of leverage as in the bending moment with the welding line as an axis. Strength against a load can be improved.

  Of course, an arc-shaped portion where the upper surfaces of the connection fittings 61 and 71 abut the side peripheral surfaces of the vertical frame main bodies 60 and 70 may be welded by flare welding or the like according to the design strength. However, since this arc-shaped portion is not flare-welded, it is not necessary to provide a curved groove or the like, so that the processing cost can be reduced.

  In addition, support connection long holes 61 a and 71 a for connecting to the protrusion 22 of the support 2 are formed in the upper surface of the connection fittings 61 and 71 having a U-shaped cross section. The column connection slots 61a and 71a are long slots in the fence width direction X having a width of 14 mm and a length of 25 mm that are vertically opened. For this reason, in combination with the long hole of the panel connection long hole 23 of the protruding metal fitting 22, the difference in the installation interval of the snow-resistant free grid panel 3 due to the inclination when installed on a slope and when installed on a flat ground is absorbed. Can be.

(Grid material)
The lattice material 8 is a steel pipe having a thickness (t = 1.0 mm), a diameter (φ = 19.1 mm), and a total height of 931 mm made of carbon steel pipe for general structure (STK400 ZSMO Z27). 8b is crushed and flattened to a length of about 64 mm.

  At the flattened upper end 8a and lower end 8b, four pin holes 8c to 8f each having a diameter of 6 mm for riveting to the pin holes 91, 91 'of the intermediate members 9, 9' are provided in two places. Has been drilled.

  As described above, since the grid member 8 is riveted to the middle members 9 and 9 ′ by the pin holes 8 c to 8 f, the upper frame member 4 and the lower frame member 5 are used to axially attach the grid member 8. No holes are drilled. For this reason, it is possible to reduce corrosion and corrosion of the end face of the steel material due to the intrusion of rainwater from the through hole.

<Temporary installation>
Next, with reference to FIG. 1 and FIG. 17, the temporary fence construction of the protective fence according to the embodiment of the present invention, its snow-resistant free grid panel, and the support connection structure of the snow-resistant free grid panel will be described in detail. When installing the protective fence 1 according to the embodiment of the present invention, first, the columns 2 are erected vertically on the ground, and the snow-resistant flexible lattice panel 3 is assembled.

  Then, the connection fittings 61 and 71 projecting outward in the fence width direction X of the assembled snow-resistant free lattice panel 3 are placed on the projection fitting 22 between the columns 2 to be installed and temporarily placed. At this time, since the connection fittings 61 and 71 have a U-shaped cross section that opens downward, the connection fitting 61 formed of a bent steel plate is provided with a U-shaped cross section on each side of the snow-resistant free lattice panel 3. The temporary placement can be performed only by fitting and removing the connection fittings 61 and 71 in the shape of a circle, so that it can be easily performed by one worker alone.

  In addition, since the connection fittings 61 and 71 have a U-shaped cross section that opens downward, the temporarily placed snow-resistant free grid panel 3 may shift or fall due to wind or an inclination angle. It can be easily fixed by connecting members such as bolts.

<Effects of the protective fence according to the embodiment>
According to the protective fence 1, the snow-resistant free grid panel 3, and the support connection structure of the snow-resistant free grid panel according to the embodiment described above, the upper frame member 4 and the lower frame member 5 have a pair of middle members 9, 9. Since the 'is inserted, the bending strength is improved by the middle members 9 and 9', and the strength does not become insufficient against a snow load. Further, as described above, it is possible to temporarily place the snow-resistant free grid panel 3 on the protruding metal fittings 22 of the column 2 and to perform the panel installation work alone by one worker. For this reason, labor costs for panel installation work can be reduced.

  Further, since the support connection long holes 61a and 71a and the panel connection long hole 23 are long holes in the fence width direction X, the snow-resistant free grid panel 3 is installed by being inclined when it is installed on an inclined ground and when it is installed on a flat ground. The difference in the mounting interval can be absorbed.

  And since the frame connection long holes 60c, 70c, 60d, 70d of the vertical frame members 6, 7 are long holes in the fence width direction X, it is possible to absorb expansion and contraction of the span between the columns due to construction errors. .

  As described above, the protective fence according to the embodiment of the present invention, its snow-resistant free grid panel, and the support connection structure of the snow-resistant free grid panel have been described in detail. In carrying out the invention, it is merely an embodiment that has been embodied, and the technical scope of the present invention should not be interpreted in a limited manner.

1: Protective fence 2: Prop 20: Prop main body 21: Cap 22: Protrusions 23: Panel connection long hole 3: Snow resistant free grid panel (free grid panel)
4: Upper frame material 5: Lower frame material 4a, 5a: Groove 4b, 4c, 5b, 5c: Round hole 6, 7: Vertical frame material 60, 70: Vertical frame body 60a, 70a: Upper end portion 60b, 70b: Lower end Portions 60c, 60d, 70c, 70d: Frame connection long holes 61, 71: Connection fittings 61a, 71a: Post connection long holes 8: Grid material 8a: Upper end portion 8b: Lower end portions 8c, 8d, 8e, 8f: Pin holes 9 , 9 ': Middle material 9a, 9a': Upper edge 9b, 9b ': Lower edge 90, 90': Round hole 91, 91 ': Pin hole

Claims (12)

An upper and lower pair of upper and lower frame members, a pair of left and right vertical frame members whose upper and lower ends are rotatably mounted on the upper and lower frame members, the upper and lower frame members And a plurality of lattice members whose upper and lower ends are rotatably mounted on the shaft,
While the middle material is inserted in the upper frame material,
On the side surfaces of the pair of vertical frame members, a U-shaped cross-section connecting bracket that is connected to the protruding bracket protruding from the side surface of the support fence and is connected from above is attached. Flexible grid panel. The middle material has a height reaching from near the upper end to near the lower end of the inner surface of the upper frame material, and its upper and lower edges are bent at an acute angle along the inner surface of the upper frame material. The flexible grid panel according to claim 1, wherein The connection fitting is provided with a strut connection long hole through which a connecting member such as a bolt or a rivet for connecting to the protruding fitting is inserted. The flexible lattice panel according to claim 1, wherein the width is longer in a fence width direction orthogonal to an axis of the frame material. The upper frame material, the lower frame material, and the vertical frame material are connected to each other via a frame connection elongated hole formed near an upper end and a lower end of the vertical frame material. , While being elongated in the fence width direction orthogonal to the axis of the vertical frame material,
At both ends of the middle material, round holes are drilled,
The flexible grid panel according to any one of claims 1 to 3, wherein a connection member such as a bolt or a rivet is inserted into the round hole and the upper frame member is fixed to the vertical frame member. . The said connection metal fittings are welded to the said vertical frame material, and the linear part along the axial direction of the said vertical frame material is longer than the other parts of the welding line. 5. The flexible lattice panel according to any one of items 4 to 4. A plurality of struts and a strut connection structure with a flexible lattice panel stretched between the struts and connected so that the relative angle between the members can be changed,
The free grid panel includes a pair of upper and lower upper and lower frame members, a pair of left and right vertical frame members whose upper and lower ends are rotatably mounted on the upper and lower frame members, and the upper frame member. Material and a plurality of lattice members whose upper and lower ends are rotatably mounted on the lower frame material,
On the side surface of the support pillar, a protruding metal fitting connected to the free grid panel is protruded,
While the middle material is inserted in the upper frame material,
A connection bracket having a U-shaped cross section for covering and connecting to the projection bracket from above is provided on a side surface of the pair of vertical frame members. Construction. The connection fitting is provided with a strut connection long hole through which a connection member such as a bolt or a rivet for connecting to the protruding fitting is inserted,
The support connection structure for a flexible lattice panel according to claim 6, wherein the support connection long hole is opened in a vertical direction and is elongated in a fence width direction orthogonal to an axis of the vertical frame member. The protruding fitting is provided with a panel connection long hole through which a connecting member such as a bolt or a rivet for connecting to the connection fitting is inserted,
The support connection structure for a flexible grid panel according to claim 6 or 7, wherein the panel connection long hole is opened in the up-down direction and is elongated in a fence width direction orthogonal to the axis of the support. The upper frame material, the lower frame material, and the vertical frame material are connected to each other via a frame connection elongated hole formed near an upper end and a lower end of the vertical frame material. The support column connecting structure for a free grid panel according to any one of claims 6 to 8, wherein the connecting portion is extended in a fence width direction orthogonal to an axis of the vertical frame member. At both ends of the middle material, round holes are drilled,
The connecting structure according to claim 9, wherein a connection member such as a bolt or a rivet is inserted into the round hole, and the upper frame member is fixed to the vertical frame member. The connection fitting is welded to the vertical frame material, the protruding fitting is welded to the support, and any welding line is a linear portion along the axial direction of the vertical frame material or the support, The support lattice connection structure for a flexible grid panel according to any one of claims 6 to 10, wherein the structure is longer than other portions. A protective fence that prevents crossing and falling,
A protective fence, wherein the snow-resistant flexible grid panel according to any one of claims 1 to 5 is connected to a support by the support connection structure of the flexible grid panel according to any one of claims 6 to 11.

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