JPH06264416A - Method of installing snowslide prevention fence - Google Patents

Abstract

PURPOSE:To make it possible to install easily a snowslide block fence at a specified angle by inserting an FRP-made main post and posts into holes bored in a concrete basis installed on a slope and spanning FRP-made horizontal materials. CONSTITUTION:A specified number of post insertion holes 11, which are slightly larger than the outside dimensions of a main post 2 and posts 5, are installed to concrete bases 10 installed on a slope so as to be at a specified angle to the vertical line respectively. Then, each of posts 5 is connected to a plurality of FRP-made main posts 2 and the lower part of each post is inserted into the post insertion hole 11. Then, FRP-made horizontal materials 3 are mounted between the main posts 2. Mortar or resin mortar is placed in the clearance between the holes 11 and the main posts 2 and the posts 5, thereby fixing the main posts 2 and the posts 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent an avalanche from a lot of snow and houses adjacent to steep slopes such as houses and livestock sheds, traffic relations such as roads and railroads, and leisure facilities such as ski resorts. Regarding the method of installing an avalanche prevention fence used as a safety fence on the slope.

[0002]

2. Description of the Related Art Conventionally, steel fences have been used as avalanche prevention fences. The structure is a fence surface composed of main pillars and cross members, or a fence surface composed of main pillars and wire mesh, or a fence surface composed of main pillars and cross members and wire mesh, and pillars supporting the main pillars. It is known that a pillar is installed on a slope and attached. In some cases, these are also used as fall prevention fences.

The installation of a steel avalanche prevention fence that has been used in the past is carried out by digging a hole for basic concrete called Negiri on the slope, laying rubble stones on it, and hitting unreinforced concrete with a thickness of about 200 mm to cure it. After that, drive the anchor bolts into place and weld the plate integrated with this to the main pillars and columns of the steel avalanche prevention fence, and assemble the fence surface using a heavy machine such as a crane. , It is a method to cast concrete to the predetermined position once again to solidify the foundation and fix it to the main pillar and pillar on the slope.

[0004]

With conventional steel avalanche prevention fences, the weight of the main pillars / struts themselves is very heavy, even for snow depths of 3 m and fence surface widths of 4 m. It is difficult to handle and is usually installed on a slope using a heavy machine such as a crane. In addition, it is important for the avalanche prevention fence to form an angle with the slope, and it is necessary to carefully install the main pillars and columns so that the angle with the slope is a preset angle. However, since the main pillars and stanchions of heavy weight are hung by a crane and held at the set angle and welded to the plate, the work is very troublesome and the angle set by mistake may not be set. However, it is not possible to adjust the angles of the main pillars and columns that have been welded once, and it is not possible to make fine adjustments after installing the avalanche prevention fence on the slope.

In addition, the avalanche prevention fence may be installed on a steep slope where heavy machinery such as a crane cannot enter, and in this case, a large weight main pillar or column is carried into the installation site by hand or by using a temporary cable. The worker will weld the heavy main pillar and the pillar to the plate while holding them at the set angle by hand.
The installation work is very difficult and requires multiple workers.

Therefore, it is an object of the present invention to provide a method for installing an avalanche prevention fence capable of solving the above-mentioned problems.

[0007]

[Means for Solving the Problems] A plurality of cross members 3 made of FRP are installed between a plurality of main columns 2 made of FRP to form a fence surface 4 for receiving snow, and columns 5 made of FRP are attached to each of the main columns 2. This is a method of installing avalanche prevention fences connected to each other on a slope 1, and a concrete base 1 for fixing the main pillar 2 and the pillar 5 to the slope 1 at a predetermined angle.
An avalanche prevention fence installation method in which 0 is provided and the lower part of the main pillar 2 and the lower part of the pillar 5 are fixed to the concrete base 10 at a predetermined angle.

[0008]

[Operation] Since the main pillar 2, the cross member 3, and the pillar 5 are made of FRP and are lightweight, the worker can easily carry them to the installation site of the slope 1 by hand, and the Since the operator installs the pillar 2 and the pillar 5 by holding them by hand and fixing them at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at the treatment angle.

[0009]

[Examples] First, the structure of the avalanche prevention fence according to the present invention will be described. As shown in FIGS. 1 and 2, a plurality of cross members 3 are attached between a pair of main columns 2 and 2 installed on a slope 1 to form a fence surface 4 for receiving snow, and the pair of main columns 2 and The upper ends of the columns 5 are connected to the columns 2, and the lower ends of the columns 5 are installed on the slope 1.

The main pillar 2 is made of a glass fiber reinforced plastic drawn material (hereinafter referred to as FRP drawn material) having an H-shaped cross section in which one side piece 6 and the other side piece 7 are integrally connected by a connecting piece 8. The main pillar 2 may be formed of an FRP drawing material having a rectangular hollow section or an FRP drawing material having an I-shaped section and a groove shape. A metal cover body 9 is attached to the lower end of the main pillar 2. As shown in FIG. 3, the cover body 9 is formed by connecting a pair of channel members 9a having a U-shaped cross section with bolts 9b. The cover body 9 is inserted and attached into a hole 11 of a concrete base 10 cast on the slope 1.

As described above, since the metal cover body 9 is attached to the portion of the main pillar 2 made of FRP drawn material, which is inserted into the hole 11 of the concrete foundation 10,
Even if the main pillar 2 is self-supporting at the time of installation, since the FRP and the edge of the hole 11 of the concrete base 10 do not come into direct contact with each other, there is no risk of the glass fiber on the outermost surface of the FRP being cut and the joint strength with the concrete is high for a long time. The bonding strength does not significantly decrease during installation, and the glass fibers used for FRP are not corroded by the alkali contained in the concrete, and the strength does not decrease even after long-term use.

That is, since the joint strength between FRP and concrete is considerably lower than the joint strength between iron and concrete, if a pillar made of FRP extraction material is directly buried in the concrete base, the joint strength will be low and it will be installed for a long period of time. In addition, the joint strength is significantly reduced, and FRP is corroded by the alkali contained in the concrete, and the strength is reduced by long-term use.

The cross member 3 is made of an FRP drawing material having a circular cross section, and is connected to the support column 2 by a fitting 12 and a nut 13. The cross member 3 may be made of an FRP drawing material having a hollow cross section.

The mounting bracket 12 is U-shaped by a pair of screw portions 14, 14 and an arcuate portion 15 as shown in FIG. 4, and the radius of the arcuate portion 15 is 1 with respect to the radius of the cross member 2.
mm to 10 mm larger, and the inner surface of the arc-shaped portion 15, that is, the cross member contact surface 15a is flattened by crushing by casting or cutting with a grinder, and the pair of screw portions 14 and 14 are formed in the holes of one side piece 6 of the column 2. 6a, 6a, and the nut 13 is screwed and tightened to press the lateral member contact surface 15a of the arc-shaped portion 15 against the lateral member 3 via the rubber sheet 16 made of rubber such as neoprene rubber. Is connected to the column 2.

As a result, the arcuate portion 15 of the mounting bracket 12
Since the contact area of the horizontal member contact surface 15a is large and the area is small even when tightened with a strong force, the reinforcing fibers in the FRP are not cut, so the strength of the horizontal member 3 does not decrease, and the rubber sheet 16 is interposed. As a result, not only the horizontal member 3 is not cracked or lost, but also cold resistance and weather resistance are improved.

That is, the FRP has reinforcing fibers inside, and the strength decreases when the reinforcing fibers are cut. Therefore, if the contact area between the mounting member 12 and the cross member 3 is small, the reinforcing fibers are cut and the strength decreases. , FRP is vulnerable to compressive strength and has a large surface pressure, which causes cracking and damage.

The pillar 5 is made of an FRP drawing material having a rectangular hollow section. The pillar 5 may be made of an FRP drawn material having an H-shaped section, an I-shaped section, and a groove shape. A metal cover body 17 is fitted and attached to the lower end of the retaining column,
The cover body 17 is the same as the above-mentioned cover body 9. The cover body 17 is fitted into the hole 11 of the concrete foundation 10 cast on the slope 1, whereby the pillar 5
The mounting strength and corrosion resistance of are improved as described above.

The upper end of the column 5 is connected to the main column 2 via a metal bracket 20. As shown in FIG. 5, the bracket 20 is mounted on a mounting plate 21 and a mounting cylinder 22.
Are fixed and reinforced by stays 23, the upper end of the support column 5 is fitted into the mounting cylinder body 22 and fixed with bolts 24 as shown in FIG. 1, and the mounting plate 21 is attached to the other side of the support column 2. It is fixed to the piece 7 with bolts 25, and by changing the mounting position of the mounting plate 21 to the pillar 2 in the longitudinal direction, the pillar 2 and the pillar 5 are attached.
You can adjust the angle made by. The other side piece 7 of the pair of columns 2
Plates 26 are respectively attached to the upper and lower positions of the above, and a rod 28 having a turnbuckle 27 is connected between the left and right upper and lower plates 26 to reinforce the pair of columns 2.

Next, a method of installing the avalanche prevention fence on the slope 1 will be described in the order of steps. As shown in FIG. 6, holes 30 called negiri are drilled at predetermined installation positions of the main pillar 1 and the pillar 5 of the slope 1, and a foundation rubble stone 31 is laid on the bottom of each hole 30 and on top of that. The concrete foundation 10 is cast on site by punching concrete with a formwork (not shown), but the hole cylinder 32 is provided on the concrete foundation 10 to provide the holes 11 into which the main pillars 2 and the support columns 5 are inserted. Install at a specified angle with respect to the vertical. For example, the reinforcing bar 33 is fixed in the hole 30 by adjusting the angle with the driving wire 34, or if the portion is not embedded in the concrete, the wooden pile is fixed by adjusting the angle with the driving wire or the like, or the wire is attached to the formwork (not shown). Adjust the angle and fix it.

As the hole cylinder 32, a box sleeve made by nailing a wooden plate or a void tube made of paper is used, and the outer dimensions of the box sleeve and the void tube are the main column 2 and the column. 5 mm or more, preferably 10 mm or more larger than the outer dimensions of the cover bodies 9 and 17 attached to the 5, and the holes 11 provided in the concrete foundation 10 are larger than the outer dimensions of the covers 9 and 17 attached to the main pillar 2 and the column 5. Is 5 mm or more, preferably 10 mm or more.

As described above, after the hole cylinder 32 is installed, concrete is poured into the mold, the mold is removed after curing, and the hole cylinder 32 is removed from the concrete base 10 to form the hole 11. At the same time, the rebar 33 that gets in the way
The number line 34 is removed. In order to remove the hole cylinder 32, in the case of a box sleeve, it is disassembled by hitting it with a hammer, and in the case of a void tube, it is melted by water and then removed. As a result, as shown in FIGS. 7 and 8, a concrete foundation 10 having holes 11 is placed on the slope 1, and the holes 11 have a predetermined angle corresponding to the mounting angle of the main pillar 2 and the mounting angle of the support column 5. Become.

To assemble the avalanche prevention fence, first, the main pillar 2,
Attach the metal cover body 9 to 2, and install the concrete base 10
Insert into hole 11 of At this time, the depth at which the main pillar 2 is buried in the concrete foundation 10 is adjusted by putting a rubble stone 35 in the hole 11. Next, several horizontal members 3 are attached to the main columns 2 and 2, the main column spacing is adjusted to a predetermined size, and the main column spacing is fixed by a rod 28 equipped with a turnbuckle 27 (see FIG. 1). . Next, the cover body 17 is fitted to the lower ends of the columns 5 and 5, and the bracket 22 is fitted to the upper ends thereof, and then inserted into the holes 11 of the concrete base 10. At this time, the burial depth of the pillar 5 is adjusted with the rubble stones 35 and the like (see FIG. 1).

After that, the brackets 22, 22 attached to the columns 5, 5 and the main columns 2, 2 are fixed with bolts 25. Finally, the remaining cross member 3 is attached. By the above assembling work, an avalanche prevention fence having a predetermined main pillar interval and having the main pillars 2 and the pillars 5 at a predetermined angle is assembled.

By the above-mentioned procedure, the avalanche prevention fence can be installed on the slope, but when it is necessary to finely adjust the angle of the fence surface 4 with respect to the slope 1, the installation angle of the columns 5 and 5 with respect to the slope can be prevented. Make fine adjustments while looking at the level from the side of the fence, and fix it with a rope etc. so that it will not move. Put the mortar or resin mortar in the hole 1 of the concrete base 10.
The space between 1 and each cover body 9, 17 is filled and fixed.

As described above, in the avalanche prevention fence of the present invention, the main pillars 2, the cross members 3, the columns 5 and the like are made of FRP, so that the weight is lighter than that of the conventional avalanche prevention fence made of steel.
It is possible to carry in the work site manually by the operator, and the main pillar 2, the pillar 5, and the cross member 3 are easily handled, so that the assembly and installation work is also easy. That is, the specific gravity and mechanical strength of FRP differ depending on what kind of material is used for the reinforcing material. For example, when glass fiber is used as the reinforcing material, the specific gravity is about 2 ± 0.5. Becomes
This value corresponds to 1/4 to 1/3 of steel materials. Actually, it is necessary to take mechanical strength into consideration, and in the case of a one-way drawn material, the weight is reduced by about 1/2. Comparing with the main pillar, which is the heaviest component, when it is made of steel (H-shaped steel 150 × 150 × 7 × 101 = 3.25 m), it reaches 100 kg, whereas the weight of FRP is less than 40 kg, It is possible to carry in the site manually.

[0026]

EFFECTS OF THE INVENTION Since the main pillar 2, the cross member 3, and the pillar 5 are made of FRP and are lightweight, an operator can easily carry them to the installation site of the slope 1 by hand, and the concrete foundation 10 cast in advance on site. Since the operator installs the main pillar 2 and the pillar 5 by holding them by hand and fixing them at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at a predetermined angle. In the hole 11 for inserting the pillar of the concrete base 10, the main pillar 2,
Since the pillar 5 can be attached at a predetermined angle by inserting the pillar 5, the main pillar 2 and the pillar 5 can be easily attached. After the main pillar 2 and the pillar 5 are inserted into the holes 11 of the concrete base 10 and assembled, the mounting angle can be finely adjusted. By providing the hole cylinder 32 at a predetermined angle, the hole 11 can be accurately formed in the concrete base 10 at a predetermined angle.

[Brief description of drawings]

FIG. 1 is a side view of an installed state of an avalanche prevention fence.

FIG. 2 is a front view of an installed state of an avalanche prevention fence.

FIG. 3 is a perspective view of a cover body.

FIG. 4 is an enlarged explanatory view of a horizontal member mounting portion by a mounting bracket.

FIG. 5 is a perspective view of a bracket.

FIG. 6 is a cross-sectional view showing a state of a slope before placing a concrete base.

FIG. 7 is a cross-sectional view showing a state of a slope on which a concrete foundation is placed.

FIG. 8 is a plan view of FIG.

[Explanation of symbols]

1 ... Slope, 2 ... Main pillar, 3 ... Horizontal member, 4 ... Fence surface, 5 ... Pillar,
9 ... Cover body, 10 ... Concrete base, 11 ... Hole, 1
2 ... Mounting bracket, 13 ... Bolt, 14 ... Screw part, 15 ... Arc-shaped part, 15a ... Cross member contact surface, 17 ... Cover body, 20 ...
Bracket, 32 ... Cylindrical body for holes.

Claims (4)

[Claims] 1. A fence surface 4 is provided between a plurality of main pillars 2 made of FRP to receive snow, by mounting a plurality of cross members 3 made of FRP, and each of the main pillars 2 is connected to a pillar 5 made of FRP. This is a method of installing the avalanche prevention fence on the slope 1. The slope 1 is provided with a concrete base 10 capable of fixing the main pillar 2 and the pillar 5 at a predetermined angle, and the concrete base 10 is provided with a lower portion of the main pillar 2. And an avalanche prevention fence installation method characterized in that the lower part of the pillar 5 is fixed and installed at a predetermined angle. 2. A main pillar 2 and a pillar 5 on a concrete base 10.
A hole 11 for inserting a pillar, which is slightly larger than the outer dimensions of the main pillar 2 and the pillar 5 is inserted into the hole 11 to be attached. How to install the avalanche prevention fence described in 1. 3. An avalanche prevention fence is assembled by inserting the main pillars 2 and the lower portions of the pillars 5 into the holes 11 and then attaching the horizontal members 3 and the like.
After that, after adjusting the angle of the avalanche prevention fence, mortar or resin mortar is filled in the gap between the hole 11 and the lower part of the main pillar 2 and the pillar 5 to fix the main pillar 2 and the pillar 5. How to install an avalanche prevention fence. 4. A hole cylinder 32 is provided at a predetermined angle on the slope 1 at a site where the concrete base 10 is cast, and then the concrete base 10 is cast in situ and then the hole cylinder 32 is removed. The method for installing an avalanche prevention fence according to claim 2, wherein a hole 11 for inserting a pillar is formed.