JPH06264418A - Method of installing snowslide prevention fence - Google Patents

Abstract

PURPOSE:To make it possible to carry in a snowslide prevention fence on a slope and install the fence easily at a specified angle. CONSTITUTION:A plate 44 is mounted to a primary concrete foundation 42 on a slope 1 where a post mounting part 32 of a metal-made mounting fitting 9 is fitted into the lower part of a post 5 and mounted. A slope mounting part 34 of each of the mounting fittings 9 is connected to the plate 44, thereby installing the main post 2 and the post 5 on the slope 1. Then, FRP-made horizontal materials 3 are mounted, thereby forming a fence side 4 while the main post 2 and the posts 5 are assembled. After they are assembled, a concrete foundation 48 is cast while the mounting fittings and the plate 4 are buried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention prevents 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. It relates to the method of installing an avalanche prevention fence on the slope for use as a safety fence.

[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, it is also used as a rockfall prevention fence.

The conventional method of installing a steel avalanche prevention fence is to dig a hole for basic concrete called Negiri on the slope, lay rubble stones on it, and make it 200 mm thick.
After hitting a level of unreinforced concrete and curing it, hit anchor bolts in place and weld the plate integrated with it to the main pillars and stanchions of the avalanche prevention fence made of steel, and then use heavy machinery such as a crane. Assembling the fence surface using, and then concrete concrete up to a 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 set in advance. In the installation method, since the main pillars and stanchions of heavy weight are hung by a crane etc. and held at the set angle and welded to the plate,
The work is very troublesome, and there are cases where the angle is incorrectly set and the angle is not set.

[0005] Moreover, the avalanche prevention fence may be installed on a steep slope where heavy machinery such as a crane cannot enter. In this case, a large weight main pillar / post is carried in to 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 attached 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. In the method of installing the avalanche prevention fences connected to each other on the slope 1, the primary concrete foundation 42 is cast in situ at the installation site of the main pillar 2 and the pillar 5 of the slope 1, and the plate 44 is anchored to the primary concrete foundation 42. Mounted with bolts 43 and nuts 45, the main pillar 2 and the pillar 5
After the pillar mounting portion 32 of the metal mounting bracket 9 is fitted and mounted on the lower part of the, the slope mounting portion 34 of the mounting bracket 9 is fixed to the plate 44, and then the cross member 3 is mounted,
The main pillars 2 and the pillars 5 are connected and assembled, and then the secondary concrete foundation 48 is placed on the primary concrete foundation 42 to bury the connecting portion between the plate 44 and the mounting bracket 9 and the mounting bracket 9. How to install the avalanche prevention fence.

[0008]

[Operation] Since the main pillar 2, the horizontal members 3, and the pillars 5 are made of FRP and are lightweight, the operator can easily carry them in manually to the place where the slope 1 is installed. Since the operator installs the main pillar 2 and the pillar 5 on the plate 44 by holding them by hand at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at a predetermined angle. The lower parts of the main pillar 2 and the pillar 5 are covered with the pillar mounting portion 32 of the mounting bracket 9, and the pillar mounting portion 32 is buried in the secondary concrete foundation 48. The contacting area is extremely small, the joint strength between the main pillar 2 and the pillar 5 and the concrete is high, and the joint strength does not significantly decrease during installation for a long period of time, and the glass fiber used for FRP is included in the concrete. It is not corroded by the alkali that is used and does not lose its strength even after long-term use.

[0009]

[Examples] First, the structure of the FRP avalanche prevention fence of 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 column 2 is made of an FRP drawing 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 pillar 2 may be formed of an FRP drawing material having a rectangular hollow section, a FRP drawing material having a cross-section shape, or a groove shape.

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

As shown in FIG. 3, the mounting bracket 12 is U-shaped by a pair of screw parts 14, 14 and an arc upper part 15, and the radius of the arc part 15 is 1 with respect to the radius of the cross member 2.
mm to 10 mm, and the inner surface of the arc-shaped portion 15, that is, the cross-member contact surface 15a is flattened by crushing by forging or cutting by a grinder, and the pair of screw portions 14, 14 of the one side piece 6 of the main pillar 2 is formed. By inserting the nuts 13 through the holes 6a and 6a and tightening the nuts 13, the lateral member contact surface 15a of the arcuate portion 15 is pressed against the lateral member 3 via the rubber sheet 16 made of rubber such as neoprene rubber. 3 is connected to the main pillar 2.

As a result, the arcuate portion 15 of the mounting bracket 12
Since the contact area of the cross member 15a of the cross member is large, the face contact is low even when tightened with a strong force and the reinforcing fibers in the FRP are not cut, so the strength of the cross member 3 does not decrease and the rubber sheet 16 is interposed. By doing so, not only the horizontal member 3 is not cracked or damaged, 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 weak in compressive strength and has a large surface pressure, so that cracking or fracture occurs.

The column 5 is made of FRP drawing material having a rectangular hollow section. The column 5 may be made of an FRP drawn material having an H-shaped cross section, a modified cross section, or a groove.

The upper end of the column 5 is connected to the column 2 via a metal bracket 20. As shown in FIG. 4, the bracket 20 includes 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. It is fixed to the side piece 7 with bolts 25, and by changing the mounting position of the mounting plate 21 to the main pillar 2, the main pillar 2 and the pillar 5
You can adjust the angle made by. The other side piece 7 of the pair of main columns 2
Plates 26 are attached to the upper and lower positions of the two, 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 main columns 2.

As described above, since the avalanche prevention fence is composed of the main pillars 2, the pillars 5, and the cross members 3 made of FRP, the main pillars 2, the pillars 5, and the cross members 3 are light in weight, and the slope 1 Workers can easily carry it to the installation site manually, and the main pillar 2,
Since the pillar 5 can be easily handled when it is installed, the avalanche prevention fence can be easily installed on the slope 1 by a worker.

That is, FRP (plastic reinforced by a reinforcing material such as glass fiber) has different specific gravity and mechanical strength depending on what kind of material is used for the reinforcing material, and for example, glass fiber is reinforced. When used as a material, the specific gravity is about 2 ± 0.5. 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 the main pillar 2, which is the heaviest component, in the case of steel (H-shaped steel 150 × 150 × 7 × 10 1 = 3.25 m), 10
In contrast to 0 kg, the FRP product weighs a little less than 40 kg, and can be carried into the site by hand.

The FRP used as the main pillars 2, lateral members 3, and pillars 5 of the avalanche prevention fence described above is a drawn material in which the reinforcing fibers are oriented in one direction, so as with steel materials, holes can be freely drilled and bolted. It is difficult to do this in terms of strength. Therefore,
As shown in FIG. 1, a metal mounting bracket 9 is fitted and mounted on the lower ends of the main pillar 2 and the supporting pillar 5, respectively, and the mounting bracket 9 is cast in situ on the slope 1 to provide a concrete foundation 10
The main pillars 2 and the pillars 5 are connected to each other and installed on the slope 1.

As shown in FIG. 4, the mounting member 9 is welded to a column mounting portion 32 formed by connecting a pair of channel members 30, 30 having a U-shaped cross section with bolts 31, and a lower end portion of one channel member 30. And the like. The sloped plate mounting portion 34 is composed of a mounting plate 33 that is fixed to the sloped plate mounting portion 3 by bending the mounting plate 33 into a dogleg shape and forming a through hole 35.
The mounting surface 34 a of No. 4 has a predetermined angle with the longitudinal direction of the column mounting portion 32.

Next, a method of installing the avalanche prevention fence on the slope 1 will be described in the order of steps. Holes 40 called "Negiri" are drilled at the installation locations of the main pillars 2 and the pillars 5 on the slope 1, and the holes 4 are
A rubble is laid on the bottom of 0 to form a rubble 41 for the foundation, and a framing stone (not shown) is assembled to the rubble for the foundation 41 to pour concrete into the primary concrete foundation 42 on site. The thickness of the concrete of the primary concrete foundation 42 is 10 cm or more in the case of reinforcing bars, and 20 in the case of unreinforced bars.
The thickness of the concrete should be changed according to the actual conditions of each site, although the thickness is preferably cm or more. The struck primary concrete foundation 42 must be aged for at least 3 days, preferably 7 days or more so that sufficient strength can be obtained.

After curing the primary concrete foundation 42, an anchor bolt 43 called a conventionally known mechanical anchor bolt is driven into the primary concrete foundation 42, the hole of the plate 44 is inserted into the anchor bolt 43, and the nut 45 is tightened to tighten the plate 44. Is attached to the upper surface 42a of the primary concrete foundation 42. A fixing bolt hole 46 is formed in the plate 44 as shown in FIG. At this time, the plate 44 and the primary concrete foundation 42
A spacer such as a wedge piece is interposed between the upper surface 42a and the upper surface 42a, and the plate 44 is adjusted to be horizontal.
The mounting height of the plate 44 is adjusted according to the embedding depth of the main pillar 2 and the pillar 5. The burial depth of the main pillar 2 and the pillar 5 may be adjusted by the depth of the hole 40, the thickness of the foundation rubble 41, the thickness of concrete, and the like.

By fitting a pair of channels 30, 30 to the lower portions of the main pillar 2 and the pillar 5, and connecting them with bolts 31, the pillar mounting portion 32 of the mounting bracket 9 is fitted to the lower portion of the main pillar 2 and the pillar 5. And mount each of them, and attach the slope mounting portion 34 to the main pillar 2,
It projects obliquely downward from the lower end surface of the column 5. As a result, the mounting surface 34a of the slope mounting portion 34 of the mounting bracket 9 forms a predetermined angle with respect to the main pillar 2 and the pillar 5. This mounting bracket 9
The mounting may be performed in advance in a factory or the like, or may be performed in a setting place on the slope 1, but it is preferable to perform it in a factory in consideration of work safety.

The slope mounting portion 34 of the mounting bracket 9 mounted on the main pillar 2 and the pillar 5 is placed on each plate 44, and the bolt 47 is screwed into the fixing bolt hole 46 of the plate 44 from the through hole 35 to form the slope. The mounting portion 34 is connected to the plate 44. At this time, it is preferable to maintain the main pillar 2 and the pillar 5 at a predetermined angle with a rope or the like so that an excessive pulling force does not act on the anchor bolt 43. The slope mounting portion 34 and the plate 44 may be fixed by welding. As a result, the angles of the main pillar 2 and the pillar 5 with respect to the vertical are determined by the plate 44 and the slope mounting portion 3.
Determined by 4.

After that, the brackets attached to the upper end surfaces of the columns 5 and 5 are connected to the main columns 2 and 2 with bolts.
Several horizontal members 3 are attached to the main pillars 2 and 2, and the distance between the main pillars 2 and 2 is adjusted to be a predetermined distance, and the fence surface distance is fixed by a rod 28 having a turn bag 27. Then, the remaining horizontal members 3 are sequentially attached to complete the assembly. Stanchions 5, 5
The adjustment of the set angle and the parallelism with respect to the slope is performed by finely adjusting the connecting portion of each mounting member 9 and the plate 44 while observing the level from the side surface of the avalanche prevention fence, and finally fixing with a predetermined tightening torque. Finally, a formwork is assembled and a secondary concrete foundation 47 having a predetermined thickness is cast on the upper surface of the primary concrete foundation 42 in-situ to form the concrete foundation 10. The mounting bracket 9 and the plate 44 are embedded to form the main pillar 2 and the pillar. Firmly fix the bottom of 5.

[0026]

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 setting place of the slope 1 by hand, and the primary concrete foundation cast in advance in the field. 42 to the plate 44 of the main pillar 2,
Since the pillar 5 is installed by being held by an operator and fixed at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at a predetermined angle. Moreover, since the lower portions of the main pillar 2 and the pillar 5 made of FRP are covered with the pillar mounting portion 32 of the mounting bracket 9, and the pillar mounting portion 32 is embedded in the secondary concrete foundation 48, the main pillar 2 and the pillar 5 are The parts that come into direct contact with the concrete are extremely small, and the joint strength between the main pillar 2 and the pillar 5 and the concrete is high, and the joint strength does not drop significantly during long-term installation, and the glass fiber used for FRP is It is not corroded by the contained alkali, and its 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 the pillars made of FRP extraction material are directly embedded in the concrete base, the joint strength will be low and the joint strength during long-term installation will be low. Is significantly reduced, and the FRP is corroded by the alkali contained in the concrete, so that the strength decreases with long-term use.

[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 an enlarged explanatory view of a horizontal member mounting portion by a mounting bracket.

FIG. 4 is a perspective view of a bracket.

FIG. 5 is a perspective view of a mounting bracket.

FIG. 6 is a plan view of a plate.

[Explanation of symbols]

1 ... Slope, 2 ... Main pillar, 3 ... Horizontal member, 4 ... Fence surface, 5 ... Pillar,
9 ... Mounting bracket, 10 ... Concrete foundation, 32 ... Pillar mounting portion, 34 ... Slope mounting portion, 42 ... Primary concrete foundation,
43 ... Anchor bolt, 44 ... Plate, 48 ... Secondary concrete foundation.

Claims (2)

[Claims] 1. A FRP between a plurality of main columns 2 made of FRP.
A method of installing an avalanche prevention fence on the slope 1 by attaching a plurality of horizontal members 3 made of the above as a fence surface 4 for receiving snow, and connecting each main pillar 2 with a pillar 5 made of FRP. The primary concrete foundation 42 is cast in place at the installation location of the main pillar 2 and the pillar 5, and the plate 44 is attached to the primary concrete foundation 42 by the anchor bolts 43 and the nuts 45.
After mounting and mounting the pillar mounting portion 32 of the metal mounting bracket 9 on the lower portion of the main pillar 2 and the supporting pillar 5, the slope mounting portion 34 of the mounting bracket 9 is fixed to the plate 44. Later, the horizontal member 3 is attached and the main pillars 2 and the pillars 5 are connected and assembled, and then the secondary concrete foundation 48 is placed on the primary concrete foundation 42 to plate 44.
And a method of installing an avalanche prevention fence in which the connecting portion of the mounting bracket 9 and the mounting bracket 9 are buried. 2. The pillar mounting portion 32 and the slope mounting portion 34 of the mounting bracket 9 are set at a predetermined angle, and the slope mounting portion 34 is mounted on the plate 44 so that the main pillar 2 and the support pillar 5 are at a predetermined angle with respect to the vertical. The method for installing an avalanche prevention fence according to claim 1, wherein the method is as follows.