JPH10168824A - Fall prevention fence - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a fall prevention fence that maintains sufficient mechanical strength and facilitates the work of stretching and fixing a wire rope. SOLUTION: Each of the columns (1, 1 ₁ to
1 _3, 1 '), the wire rope receiving part (3a) and multistage spaced brackets (3) with mounting screws wear recesses in the struts and (3b) frame the fixing mounting portion and (3c) And a wire rope (2) is engaged and held in a wire rope receiving portion (3a) of each bracket (3) in each step, and both ends thereof are tied to a support by a cable end fitting (6), and a divided hollow is provided. A frame body (8) composed of frame members (8a, 8b) is screwed to a frame body fixing mounting portion (3c) of the bracket (3), and the four circumferences of the sheet-like protective body (7) are attached to the frame body. By being sandwiched by (8), a fall prevention fence that is superior in impact resistance in strength and can be easily mounted and repaired from the road side is configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention fence,
For example, the present invention relates to a fall prevention fence attached to an elevated road bridge to prevent a load of a vehicle from collapsing and scattered due to a collision of a running vehicle or other accidents and to fall onto a railway line or a road under an elevated road. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 12 and 13, this type of fall prevention fence has a structure in which a lath net b is stretched inside a frame a framed in a square shape. This is attached to the overpass e or the like directly or with the support d. Also disclosed is a structure in which a wire rope c is provided in a tensioned state in multiple stages by being suspended between pillars on the back side of the lath net b, thereby maintaining strength as a double structure of the lath net and the wire rope.

[0003]

However, in this conventional fall prevention fence, since the four circumferences of the lath net b are clamped by the plate material of the frame a and fixed at predetermined positions by bolts and nuts, even if the wire rope is used. Even if it is reinforced by c, the mechanical strength is not enough, and when an object that has collapsed from the truck bed on an elevated road or the like collides, it cannot withstand the impact and breaks through the lath net b and the railway under the elevated There was a risk of falling on railway tracks.

[0004] Further, the wire rope c is such that the terminal is fixed to the support by a U-shaped bolt and stretched while the worker suspends the wire rope between the supports. Despite this, the wire rope is easy to slack in the middle, and work on the back side of the support (opposite the road side) has been forced, making it difficult to stretch and fix the wire rope, requiring a lot of labor and time. Cost me.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a fall prevention fence which has sufficient mechanical strength and facilitates the work of stretching and fixing a wire rope. .

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a wire rope receiving portion, a mounting recess for attaching a screw to a support pillar, a fixing recess for mounting a frame, and a frame. Attach the wire rope to the wire rope receiving part of each bracket in each step, hold the wire rope in each step, and tie both ends of the wire rope to the strut with cable ends, and divide it. A fall prevention fence characterized in that a frame made of a hollow frame material is screwed to a mounting portion for fixing the frame of the bracket, and four circumferences of the planar protective body are clamped by the frame. Was configured.

In this case, a required number of columns are erected between main columns of one span, a wire rope is stretched between the main columns (claim 2), and the upper part of the bracket is used as a wire rope receiving portion (claim 2). Item 3) Alternatively, it is effective that the concave portion for attaching the mounting screw to the column in the bracket also serves as the wire rope receiving portion (claim 4). Further, the planar protective body is formed in a shape corresponding to the length between the columns,
It is composed of one or a combination of two or more selected from expanded metal, punched metal, diamond-shaped wire mesh, welded wire mesh, and synthetic resin plate (claim 5), and the divided hollow frame material is formed of an extruded aluminum alloy material. (Claim 6) Further, it is more effective if a horizontal rail for protection is attached to the lower side of the support and is bridged between the supports (Claim 7).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a fall prevention fence according to the present invention, and FIG. 2 is a view taken along the line II-II of FIG. A predetermined interval (for example, 5 to 20) along the side edge of the overpass 10 or the like.
m), the main supports 1 and 1 'are erected,
1 span is defined as 1 span S. A required number (three in this embodiment) of struts 1 ₁ , 1 is provided between the main struts 1, 1 '.
Erecting _2, 1 ₃ at a predetermined interval (e.g., 1 to 2 m).
Main columns 1, 1 'and post 1 _1, 1 _2, 1 _3, for example, a steel or aluminum tubular support column, as shown in FIGS. 7 (a) and (b), the cross-sectional on both sides L-shaped attachment members 11, 11 'are attached by bolts 12a and nuts 12b.
It is fixed to an overpass (in this specification, a bridge over a sea or a river or a road shoulder) by an anchor bolt 13 screwed to 1 '. Each mounting member 11,
In this embodiment, four reinforcing ribs 14a, 14b, 14c, and 14d are formed at an interval 11 'in this embodiment.

In FIGS. 1 and 2, a required number of wire ropes 2 (four wires in this embodiment) are provided between main supports 1 and 1 'of one span at a distance in the direction in which the main supports are erected. rope 2 _{1, 2} 2, 2 _3, 2 ₄₎ disposed in tension the. A predetermined position of the main columns 1, 1 'and post 1 _1, 1 _2, 1 stretched position of the wire rope 2 in each of the ₃ and the upper and lower, the bracket 3 is an important component in the present invention At multiple intervals (in this embodiment, six brackets, six brackets 3 ₁ ,
3 _{2, 3} 3, 3 _4, 3 _5, 3 ₆₎ attached. Each bracket 3 is desirably formed of an extruded shape member of an aluminum alloy. As shown in FIG. 3, which is a view taken along the line III-III in FIG. and the wire rope receiving part 3a for receiving the wire rope 2, the central portion to accommodate the head 15a of the mounting screw 15 to fasten the bracket 3 main columns 1, 1 'and post 1 _1, 1 _2, 1 ₃ It has a formed recess 3b for attaching a fixing screw and a frame body fixing mounting portion 3c for hanging a tail portion and fixing a frame 8 described later to the bracket 3.

Here, the means for stretching the wire rope 2 will be described. Since the wire rope 2 needs to maintain a mechanical strength enough to withstand the impact when an object that has collapsed from the truck bed collides, a three-stranded galvanized steel wire (18 mm in outer diameter) is used in this example. ing. The wire rope 2, in each bracket 3 (this embodiment in each stage formed in each of FIGS. 1 and main columns 1,1 in Figure 2 'and post 1 _1, 1 _2, 1 _3, the bracket 3 _2, 3 _3, 3 _4, 3 ₅₎ wire rope receiving part 3a
In FIG. 3, the support column is dropped from the front side (the road facing surface side) of the column and is engaged and held. As shown in FIGS. 4A and 4B, a screw 6a is attached to the outer surface of the wire rope 2 via a turnbuckle mechanism 5, as shown in FIGS.
Is attached. Main column 1
At the position where the bracket 3 is disposed in (1 '), a through hole 1a through which the cable end fitting 6 is inserted is formed. When the wire rope 2 is engaged with and held by the wire rope receiving portion 3a (FIG. 3) of the bracket 3, the cable end fitting 6 of the terminal portion is held.
Is horizontally inserted into the through hole 1a of the main support 1 (1 '), is fixed by the cable end nut 6b, and is tightened by the turnbuckle mechanism 5.

Next, a planar protective body 7 provided on the front surface of the wire rope 2 and a frame 8 for supporting the planar protective body 7
And the main body 1, 1 'shown in FIG. 1 and FIG.
And post ₁ 1, 1 _2, 1 ₃ of the means for attaching each be described.

[0012] surface protection member 7 has a width corresponding to the length between the adjacent struts in the strut 1 _1, 1 _2, 1 ₃ including the main post 1, 1 ', crossover 10 from the upper end of the column And the like having a height reaching the vicinity of the upper part. The sheet-like protective body 7 is manufactured by forming a large number of slots of a predetermined length extending in the length direction in a plate-like extruded shape such as an aluminum alloy in a staggered arrangement, and expanding the extruded shape in the width direction. Expanded metal, punched metal in which a number of holes are drilled in the above-mentioned extruded plate, or nets such as diamond-shaped wire mesh and welded wire mesh, as well as synthetic resin plates such as polycarbonate, and other plate-like materials are all included. These may be used alone or in combination of two or more. In this embodiment, the mass 300k
J to survive gf object collision at 60-80km / hr
An expanded metal made of a processed material (thickness: 4 mmt or 5 mmt) of an ISA5052P alloy H34 humidity control plate was used.

On the other hand, the frame 8 is composed of a combination of _four frame members 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ surrounding the four circumferences of the sheet-like protective body 7, and is shown in FIGS. As shown in ()), the entire frame body 8 is formed into two parts, and is constituted by divided hollow frame members 8a and 8b in which a hollow part is formed at the time of connection. Frame members 8 ₁ , 8
₂ , 8, ₃ and 8 ₄ are cut at an angle of 45 ° to form a rectangular frame. As shown in FIGS. 5 and 6, (a) and (b) of FIG. In the state where the ends of one of the members 8b are halved, L-shaped angle members 9 are interposed at the four corners, and bolts 15a and nuts 1
Fix by 5b. Then, the planar protective body 7 is disposed on the frame members 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ framed in a rectangle,
By joining one of the divided hollow frame members 8b to the other 8b, the planar protective body 7 is held by the frame body 8. The divided hollow frame members 8a and 8b are fixed by bolts 16 at appropriate positions sandwiching the planar protective body 7.

One of the divided hollow frame members 8b constituting the frame 8
, Ie, each support in FIGS. 1 to 3
Bracket 3 (6 brackets mentioned above)
To 3 ₁, 3_Two, 3_Three, 3_Four, 3_Five, 3₆) For fixing frame
3 and 4 at a position corresponding to the mounting portion 3c.
As shown in (b), a mounting hole 8c is formed,
The body 8 holds the above-mentioned brass while holding the planar protective body 7 therebetween.
Bolts 17a and bolts 17a
And is attached by a nut 17b. As a result, FIG.
Column 1 including main columns 1 and 1 '₁, 1_Two, 1_ThreeTo
Frame that sandwiches planar protective body 7 between adjacent columns
8 can be easily attached via the bracket 3.
Wear.

In the above embodiment, the bracket 3
The upper part of the wire rope is a wire rope receiving portion 3a, and the wire rope 2
8 has been described, but FIG. 8 shows an embodiment different from this. In this embodiment, the upper and lower positional relationship of the bracket 3 is reversed, a frame body fixing mounting portion 3c for fixing the frame 8 to the bracket 3 is formed on the upper side, and the head 15a of the mounting screw 15 is attached. A recess 3b for attaching a fixing screw formed in the center for storage is also used as the wire rope receiving portion 3a. That is, the lower part of the inner surface of the mounting screw fixing recess 3b is a wire rope receiving portion 3a, and the wire rope 2 is a mechanism that is engaged and held by the wire rope receiving portion 3a.
Each bracket 3 is supported ( ₁₁ ) by a mounting screw 15.
The frame 8 is provided with bolts 17a and nuts 17 on the frame fixing mounting portions 3c of the brackets 3.
The point attached by b does not differ from the embodiment shown in FIG. Furthermore, according to the present embodiment, since the wire rope 2 comes into contact with the support via the bracket 3, the overall strength of the fence is preferable.

In each of the above embodiments, brackets are attached to the columns in multiple stages with intervals, wire ropes are stretched, and then, when the frame is mounted, four rounds of the sheet-like protective body are clamped in advance by the frame. The mounting means for fixing the frame to each bracket has been described. However, the present invention does not specify the procedure of the construction, and after the frame is mounted on each bracket, the planar protective body is disposed. The four circumferences may be clamped, and, in some cases, the frame that clamps the planar protective body may be attached to each bracket, and then the wire rope may be inserted and stretched.
Furthermore, although the example in which the wire rope is stretched between the main supports has been described, it is needless to say that the individual ropes may be individually tied to each other to increase the number of mounting steps.

The embodiment shown in FIGS. 1 and 2 is an example in which each pillar is fixed to a rising portion such as an overpass with an anchor bolt. However, there are many cases where the pillar stands up directly from the road surface. 9, 10, and 11
Shows the embodiment. Post ₁ 1, 1 ₂
Is buried under the road surface (GL). The post ₁ 1, 1 respectively on the _second road surface (GL) lower side, attached by bolts 22 to mounting member 21, 21 'of the L-shaped cross-section so as to sandwich the strut. And
Install the rungs rails 20 for protection by a bolt 23 to the mounting member 21, 21 ', struts ₁ 1, 1 ₂ ... to bridge between. The horizontal rail 20 may be provided with another horizontal rail 20 'at intervals depending on the height of the lower part of the column as necessary. By installing the cross rails, it is possible to maintain the strength of each column against the force received in the lateral direction, and to ensure the safety of running of the vehicle.

[0018]

As described above, according to the present invention, the brackets are attached to the respective columns in a multi-stage manner at intervals, the wire ropes are engaged and held by the respective brackets in the respective columns, and both ends thereof are tied to the columns. At the same time, a frame made of a divided hollow frame material is attached to the bracket, and four sides of the planar protective body are clamped by the frame to constitute a fall prevention fence.

(1) The planar protective body is securely fixed at its four corners by a frame, and the frame is firmly attached to each support via a bracket. Since it is stretched on the back, the impact force when an object that has collapsed from the truck bed collides is mainly absorbed by the frame, which provides greater impact resistance than a conventional fall-prevention shelf. If the planar protective body is damaged by an impact, the planar protective body at that location can be removed together with the frame from the bracket and replaced, so that repair work can be easily performed. And the number of parts can be reduced compared with the conventional fall prevention shelf.

(2) In the case where a wire rope is stretched between the main supports, conventionally, the ends thereof are fixed to the main supports by U-bolts while simply suspended between the main supports. Although the rope easily slackened in the middle and required the skill of the worker for the stretching work, in the present invention, the end of the wire rope was mainly engaged with the bracket provided on each of the columns between the main columns while the wire rope was engaged and held. Since it can be fixed to the support, and the wire rope and the planar protective body can be engaged and assembled from the road side in front of the support, the work of attaching the fall prevention fence is easy and efficient.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a fall prevention fence according to the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a partially cutaway sectional view taken along the line III-III in FIG. 1;

FIG. 4A is a sectional view taken along the line II-II in FIG.
FIG. 4B is a partially enlarged view of FIG.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 1;

FIG. 6A is an enlarged partial cutaway view of a portion C in FIG. 1;
(B) is bb sectional drawing of FIG.6 (a).

FIG. 7A is a sectional view taken along the line AA of FIG. 1;
(B) is a sectional view taken along the line BB.

FIG. 8 is a partially broken sectional view showing another embodiment corresponding to the form shown in the sectional view taken along the line III-III of FIG. 1;

FIG. 9 is a front view showing another embodiment of the fall prevention fence according to the present invention.

FIG. 10 is a sectional view taken along the line DD in FIG. 9;

11 is a sectional view taken along the line EE in FIG. 9;

FIG. 12 is a front view in which a part of a conventional fall prevention fence is cut away.

13 is a sectional view taken along the arrow XIII-XIII in FIG.

[Explanation of symbols]

1,1 '... main post 1 ₁ to 1 ₃ ... pillar 2 (21 _{to 24)} ... wire rope 3 (3 ₁ to 3 ₆₎ ... bracket 3a ... wire rope receiving part 3b ... mounting screws wear recess 3c ... Attachment part for fixing frame body 5 ... turnbuckle mechanism 6 ... cable end fitting 6a ... screw 6b ... cable end nut 7 ... planar protective body 8 ... frame body 8 ₁ to 8 ₄ ... frame member 8a, 8b ... divided hollow frame material 9 ... L-shaped angle material 10 ... Overpass 20 ... Horizontal rail

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisao Saito 1-34-1, Kambara, Kambara-cho, Anbara-gun, Shizuoka Prefecture Within Nippon Light Metal Co., Ltd. Group Technology Center (72) Inventor Hirokazu Ito 43-3 Harumi-cho, Tomakomai-shi, Hokkaido Nippon Light Metal Co., Ltd. Tomakomai Factory

Claims (7)

[Claims] 1. A bracket having a wire rope receiving portion, a concave portion for fastening a screw for attaching to a support screw, and a mounting portion for fixing a frame body is attached to each of the columns erected at a predetermined interval in multiple stages at intervals. A wire rope is engaged and held in a wire rope receiving portion of each bracket in the step, and both ends thereof are tied to a support post with a cable end fitting, and a frame body formed of a divided hollow frame material is fixed to the frame body of the bracket. A fall prevention fence characterized by being screwed to a mounting portion and having four sides of the sheet-like protective body sandwiched by the frame. 2. The fall prevention fence according to claim 1, wherein a required number of columns are erected between main columns of one span, and a wire rope is stretched between the main columns. 3. The fall prevention fence according to claim 1, wherein an upper portion of the bracket is a wire rope receiving portion. 4. A concave portion for attaching a mounting screw to a support post of the bracket also serves as a wire rope receiving portion.
Or the fall prevention fence according to claim 2. 5. The planar protective body is formed in a shape corresponding to the length between the columns, and is one or more selected from an expanded metal, a punched metal, a diamond-shaped wire mesh, a welded wire mesh, and a synthetic resin plate. The fall prevention fence according to any one of claims 1 to 4, comprising a combination of: 6. The fall prevention fence according to claim 1, wherein the divided hollow frame member is formed of an extruded aluminum alloy. 7. The fall-prevention fence according to claim 1, wherein a horizontal rail for protection is attached to a lower side of the support, and the support rail is bridged between the supports.