JPH0624009U - Corner structure of rockfall prevention fence - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A large number of wire ropes are engaged with a pair of corner stanchions without a chuck or a pull rod. [Structure] A pair of corner struts 2 are erected at a short interval L so as to sandwich a corner reference point P of the foundation at the boundary between the road side A and the mountain side B. And a plurality of engaging holes are formed in the web of the corner strut 2 with vertical intervals, and a wire rope 6 is slidably inserted into these engaging holes 4. The pair of corner struts 2 are engaged with each other so that the corner angle θ is divided in half.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a corner structure of a rockfall prevention fence.

[0002]

[Prior art]

 The pillars at the corners of conventional rockfall prevention fences are made of H-shaped steel consisting of a pair of flanges and webs that connect them, and the corner pillars are supported by diagonal auxiliary pillars, and the wire rope that supports the wire mesh is It is fixed to the outer surface with U bolts.

[0003]

[Problems to be solved by the device]

 However, when the corner angle of the above-mentioned conventional structure is small, when the wire rope exceeds the bendable angle, a pair of terminal stanchions are newly installed and a large number of wire ropes are chucked to them (see the symbol in Fig. 1-A). 11a) and the attracting rod (see 11b in FIG. 1-A), the work cost and the parts cost were high. Also, if the terrain is bad and the distance between a pair of adjacent corners is short, the wire rope will also be short, so the energy absorption due to the elongation of the wire rope will be small, and the function of the fence has deteriorated.

In view of the above points, the present invention newly installs a pair of corner struts when the corner angle becomes small and divides the corner angle by half so that the minimum corner angle can be up to 32 degrees. , These corner stanchions can be engaged with a large number of wire ropes without chucks or pulling rods, and even when the distance between a pair of adjacent corners is short, the wire ropes can be continuous and It is an object of the present invention to provide a corner structure that can maintain good energy absorption.

[0005]

[Means for Solving the Problems]

 In the problem solving means according to the present invention, as shown in FIG. 1, a pair of corner struts 2 are erected at short intervals L so as to sandwich a corner reference point P of the foundation 1 at the boundary between the road side A and the mountain side B. The corner strut 2 is made of an H-shaped steel consisting of a pair of flanges 2A and a web 2B connecting them, and the web 2B of the corner strut 2 is formed with a plurality of engaging holes 4 with vertical intervals. A wire rope 6 is slidably inserted into and engaged with the engagement holes 4, and the pair of corner struts 2 are configured to share the corner angle θ in half.

[0006]

[Action]

 In the above problem solving means, a construction method will be described. A terminal support column 10, a pair of corner support columns 2, and a predetermined number of intermediate support columns 12 are erected on the foundation 1. Then, a predetermined number of wire ropes 6 are fixed to the flanges of the intermediate support columns 12, inserted into the engagement pipes 5 of the corner support columns 2, and fastened to each end support column 10 with the chuck 11a, the pull rod 11b and the nut 11c. Then, the wire rods 11d are fixed to the terminal columns 10, and the wire nets N are attached to these wire rods and the wire rope 6 by U bolts.

[0007]

【Example】

 Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1A to 1C to FIG. 2. In the illustrated rockfall prevention fence, the corner reference point P of the foundation 1 at the boundary between the road side A and the mountain side B will be described. A pair of corner columns 2 (for example, a height of 2 m) are erected so as to be sandwiched therebetween with a short interval L (for example, 500 mm). As shown in FIG. 1-C, each corner strut 2 is made of H-shaped steel consisting of a pair of flanges 2A (for example, width 175 to 300 mm, thickness 11 to 15 mm) and a web 2B (for example, width 75 to 100 mm) that connects them. A plurality of lateral holes 3 (for example, 6) are formed in the web 2B of the corner column 2 at a vertical interval, and each lateral hole 3 has an hourglass-shaped engaging hole 4 with an engaging tube 5 formed therein. The engagement tubes 5 are processed and fixed in a drum shape as shown in FIG. 2 described later.

A wire rope 6 (for example, a diameter of 18 mm and a tensile strength of 12 tons) is slidably inserted into the engagement hole 4, and the short interval L 2 between the pair of corner columns 2 is a wire. The rope 6 is set to be as short as possible within the bending allowable range, and the pair of corner struts 2 are configured to share the corner angle θ in half.

In FIG. 1-B, between the angle θ formed by the fence construction lines C1 and C2 and the angle α formed by the center line C4 of the corner column 2 with respect to the fence construction line and the corner construction line C3, The following equation holds.

Α = (θ / 4) + 45 ° Further, at the end of the foundation 1, a known H-shaped steel terminal column 10 with a reinforcing column 9 is erected, and the terminal column 10 is provided with the wire rope. 6 is tightened by a known chuck 11a, a pull rod 11b and a nut 11c. Further, a plurality of well-known intermediate columns 12 are erected, and the intermediate columns 12 are made of H-shaped steel consisting of a pair of flanges and a web connecting them, and a wire rope is a U-bolt on the flanges. It is fixed.

A wire net N is stretched on the mountain side of the wire rope 6 and the mountain sides of the columns 5, 10 and 12, and this wire net is fixed to the wire rope 6 by U bolts 14. In particular, the wire net N is also fixed to the wire rope 6 between the corner pillars 2 by the U bolt 14. Then, the end of the wire net N is fixed to the terminal column 10 by using the net rod 11d.

As for the engagement tube 5, as shown in FIG. 2, the straight circular tube 13 is inserted into the lateral hole 3, and the conical processing tools M1 and M2 are press-fitted from both sides of the circular tube 13. Thus, the engagement hole 4 is processed into a drum shape, and the engagement tube 5 is fixed. The wire rope 6 is inserted into and engaged with the engagement hole 4.

Although not shown in the drawings, an H-shaped steel terminal support is erected at the end of the foundation 1, and the wire rope 6 is attached to the end support of the well-known chuck which is the same as the terminal support 10. It is tightened with a hook, a pull rod and a nut.

Next, the construction method will be described. The base 1 is provided with terminal posts 10, a pair of corner posts 2, and a predetermined number of intermediate posts 12 standing upright. Then, a predetermined number of wire ropes 6 are fixed to the flanges of the intermediate support columns 12, inserted into the engagement pipes 5 of the corner support columns 2, and fastened to each end support column 10 by the chuck 11a, the attraction rod 11b and the nut 11c. . Then, the wire rods 11d are fixed to the terminal columns 10, and the wire net N is stretched by U bolts on the wire rods 6 and the wire rods 6.

Further, the short interval L between the pair of corner struts 2 will be described. This interval is preferably narrow in terms of widening the range of application to the terrain, but the flexibility of the wire rope and the corner stanchions of the corner stanchions. From the workability, 500 to 700 mm is suitable. However, if the terrain allows, it is possible to reach 700 to 3000 mm, but in this case, corner struts are used individually in loose corners rather than in pairs. Take shape. Also in this case, the strength effect is 700 mm or less.

FIG. 3 shows an embodiment when the corner angle θ is small (90 degrees), and in this embodiment as well, the short interval L between the corner columns 2 is 500 mm. Other configurations and operations are the same as those in the above-mentioned embodiment.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

[0018]

[Effect of device]

 As is clear from the above description, according to the invention of claim 1, a pair of corner struts are erected at a short interval so as to sandwich the corner reference point of the foundation of the boundary between the road side and the mountain side. Is made of H-shaped steel consisting of a pair of flanges and a web that connects them, and the corner support web has a plurality of engaging holes formed at a vertical interval. Are slidably inserted and engaged with each other, and the pair of corner struts described above are configured to share a corner angle in half.

Therefore, according to the present invention, the corner angle is divided by half by the pair of corner stanchions, so that the minimum corner angle can be up to 32 degrees, and a large number of wire ropes are attached to these corner stanchions. It can be engaged without a chuck or a pulling rod, greatly simplifying the work. Even when the topography is bad and the distance between a pair of adjacent corners is short, the wire rope can be continuous, and the energy absorption due to the extension of the wire rope can be maintained well.

Further, according to the invention of claim 2, since the engagement tube is shaped like an hourglass, the work of inserting and engaging the wire rope into the engagement tube can be facilitated and the corner angle can be increased. There is an effect.

[Brief description of drawings]

FIG. 1-A is a front view showing an embodiment of a rockfall prevention fence having a corner structure of the present invention.

FIG. 1-B is a plan view of the same.

FIG. 1-C is an enlarged cross-sectional view of the corner column.

FIG. 2 is an explanatory view of a method of processing the same corner strut.

FIG. 3 is a plan view showing a modified example of a rockfall prevention fence having a corner structure according to the present invention.

[Explanation of symbols]

 1 Foundation 2 Corner prop 2A Flange 2B Web 3 Horizontal hole 4 Engagement hole 5 Engaging pipe 6 Wire rope 10 Terminal prop 12 Intermediate prop N Wire mesh A Road side B Mountain side P Corner reference point L Short distance θ Corner angle

Claims (2)

[Scope of utility model registration request] 1. A pair of corner struts are erected at a short interval so as to sandwich a corner reference point of the foundation of the boundary between the road side and the mountain side, and the corner struts are formed from a pair of flanges and a web connecting them. And a plurality of engaging holes are formed in the web of the corner strut with vertical intervals, and a wire rope is slidably inserted and engaged in these engaging holes. The corner support structure of the rockfall prevention fence is characterized in that the corner columns of are configured so as to share the corner angles in half. 2. The corner portion structure of a rock fall prevention fence, wherein the engagement hole in the corner support column according to claim 1 is formed in a drum shape.