JPH0671508U - Avalanche prevention fence installation structure - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to easily adjust the burial depth of FRP main columns and columns. [Structure] A metal cover body 9 is attached to a lower portion of a main pillar 2 and a pillar 5 made of FRP, and a main body 31 is attached to the cover body 9.
The stud bolt 32 is inserted through and the height adjuster 30 fixed by the nut 33 is attached, the cover body 9 is inserted into the hole 11 of the concrete foundation 10 of the slope 1, and the stud bolt 32 is brought into contact with the bottom of the hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an avalanche prevention system that is used as a safety fence to prevent avalanches from houses with a lot of snow and adjacent to steep slopes, houses such as livestock sheds, traffic relations such as roads and railroads, and leisure facilities such as ski resorts. Regarding the structure to install the fence on the slope.

[0002]

[Prior art]

 As an avalanche prevention fence, it is known that the fence surface is composed of a main pillar made of steel and a cross member, and a support pillar supporting the main pillar.

Since a conventional avalanche prevention fence is composed of iron main pillars, horizontal members, and pillars, red rust rusts one winter after installation, and it is necessary to apply a rust preventive agent every year. Also, about 10 years after the installation, it was necessary to take measures such as attaching a reinforcing plate due to rust. Furthermore, with an iron avalanche prevention fence with a width of 3 m that can withstand a snowfall of 3 to 4 m, the weight is 1400 kg / unit, the installation site is a steep slope, and it is a place where it is difficult to bring in large machines, so installation is manual. I had no choice but to rely on it. For this reason, helicopters are sometimes used for the installation. Therefore, the construction cost is high, the user has been keen to develop an avalanche prevention fence that is lighter in weight and requires no maintenance.

Therefore, the present applicant first applied for an avalanche prevention fence capable of solving the problem.

That is, a plurality of horizontal members made of FRP are attached between a plurality of main pillars made of FRP to form a fence surface for receiving snow, and each main pillar is connected with a pillar made of FRP. I applied for an avalanche prevention fence. With this avalanche prevention fence, the main pillars, cross members, and columns are FRP, so the weight is light and the avalanche prevention fence is light, and rust does not occur.

[0006]

[Problems to be solved by the device]

 Since the main pillars and columns of the FRP avalanche prevention fence are made of FRP, the main columns and pillars cannot be installed on the concrete foundation that is cast on the slope by welding or bolts. A hole is formed, a cover body is fitted and attached to the lower part of the main pillar and column, and the cover body is inserted and installed in the concrete foundation.

In this way, when the main pillar and the pillar are installed on the slope, the insertion depth of the main pillar and the pillar into the hole of the concrete foundation, that is, the burial depth is adjusted to adjust the main pillar and the pillar to a predetermined height. It is necessary to pay attention. However, in the case of the above-mentioned installation structure of main pillars and columns, since the burial depth is adjusted as follows, fine adjustment is difficult and the work is very troublesome. In other words, since rubble is laid in the hole of the concrete foundation that is deeply opened for adjustment, it is difficult to finely adjust, and when the hole becomes shallower than planned, it is necessary to chip the bottom of the hole of the concrete foundation. There is a lot of work to do.

Therefore, an object of the present invention is to provide an avalanche prevention fence installation structure that can solve the above-mentioned problems.

[0009]

[Means for Solving the Problems]

 A plurality of horizontal members 3 made of FRP are mounted between a plurality of main pillars 2 made of FRP to form a shelf surface 4 for receiving snow, and a pillar 5 made of FRP is connected to each main pillar 2 to form an FRP. As an avalanche prevention fence made of steel, a height adjusting tool 30 is attached to each of the main pillars 2 and the supporting pillars 5, and the height is adjusted by the height adjusting tool 30 so that the main pillars 2 and the supporting pillars 3 are sloped to each other. An avalanche prevention fence installation structure that is installed on the concrete foundation 10 that has been placed in.

[0010]

[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 in manually to the place where the slope 1 is installed. Since it can be installed by holding it by a worker and fixing it at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at a predetermined angle, and the main pillar 2, the pillar 5, and the cross member 3 are rusted. The durability can be improved without maintenance, maintenance due to rust is not necessary, and the height can be adjusted by the height adjuster 30, so that the buried depth of the main pillar 2 and the pillar 5 can be easily adjusted.

[0011]

【Example】

 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 The upper ends of the columns 5 are connected to the columns 2 and 2, respectively, and the lower ends of the columns 5 are installed on the slope 1.

The main pillar 2 is made of a FRP extraction material having an H-shaped cross section in which one side piece 6 and the other side piece 7 are integrally connected by a connection piece 8. The main pillar 2 may be formed of an FRP drawing material having a rectangular hollow section, a cross-section, or a groove-shaped FRP drawing material. A metal cover body 9 is attached to the lower end of the main pillar 2. As shown in FIGS. 3 and 4, the cover body 9 is formed by connecting a pair of channel-shaped channel members 9a, 9a with bolts 9b, and a height adjusting tool 30 is attached to the cover body 9. There is.

As shown in FIGS. 3 and 4, the height adjuster 30 has an L-shaped main body 31 welded to one of the channel members 9a, and a support body attached to the main body 31 so as to be vertically adjustable, For example, the stud bolt 32 is inserted through the lateral piece 31a of the main body 31, and a pair of upper and lower lock nuts 33 are screwed into the stud bolt 32 and fastened to the upper and lower surfaces of the lateral piece 31a. It is located at the central portion of 9 and can be moved up and down with respect to the main body 31 by loosening a pair of lock nuts 33, so that the downward projecting length can be adjusted.

The main pillar 2 is inserted into the hole 11 of the concrete foundation 10 cast in situ on the slope 1, and the stud bolt 32 is brought into contact with the bottom of the hole 11 to insert into the hole 11 of the main pillar 2. The depth is specified, and the insertion depth into the hole 11 can be adjusted by adjusting the downward protruding length of the stud bolt 32.

As described above, since the metal cover body 9 is attached to the portion of the main pillar 2 made of the FRP drawn material which is embedded in the concrete foundation 10, the main pillar 2 is made to stand by itself at the time of assembly. In addition, there is no risk that the reinforcing fibers on the outermost surface of the FRP will be cut without the FRP forming the main pillar 2 and the edge of the concrete hole 11 coming into direct contact, and the joint strength with the concrete is high and during long-term installation. The bonding strength is not significantly reduced, and the glass fibers used for FRP are not corroded by the alkali contained in the concrete, and the strength is not reduced by 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 embedded in the concrete base, the joint strength will be low and installation for a long period of time will be possible. The joint strength decreases remarkably, and the FRP is corroded by the alkali contained in the concrete and deteriorates in strength after 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 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. 5, the mounting bracket 12 is U-shaped by the pair of screw portions 14, 14 and the arcuate portion 15, and the radius of the arcuate portion 15 is 1 mm with respect to the radius of the cross member 2. The inner surface of the arcuate portion 15, that is, the lateral member contact surface 15a, is made flat by crushing by forging or cutting by a grinder, and the pair of screw portions 14 and 14 are formed in the holes of the 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 arcuate portion 15 against the lateral member 3 via the rubber sheet 16 made of rubber such as neoprene rubber. 3 is connected to the column 2.

As a result, the contact area of the cross member contact surface 15a of the arcuate portion 15 of the mounting bracket 12 becomes large, and the area is low even when tightened with a strong force, and the reinforcing fibers in the FRP are not cut. Therefore, the strength of the horizontal member 3 does not decrease, and the interposition of the rubber sheet 16 does not cause cracking or damage of the horizontal member 3, and also improves cold resistance and weather resistance.

That is, since the FRP has reinforcing fibers inside, and the strength decreases when the reinforcing fibers are cut, the reinforcing fibers are cut and the strength decreases when the contact area between the mounting member 12 and the cross member 3 is small. , FRP is weak in compressive strength and has a large surface pressure, which causes cracking and fracture.

The column 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 cross section, a modified cross section, or a groove shape. A metal cover body 9 is fitted and attached to the lower end portion of the pillar 5, the cover body 9 is the same as the above-mentioned cover body 9, and a height adjusting tool 30 is attached. The cover body 9 is inserted into the hole 11 of the concrete foundation 10 that is cast on the slope 1. This improves the mounting strength and corrosion resistance of the support column 5 in the same manner as described above, and the height adjuster 3 The insertion depth can be adjusted with 0.

The upper ends of the columns 5 are connected to the main columns 2 via metal brackets 20. As shown in FIGS. 6, 7 and 8, the bracket 20 has a pair of flanges 41 fixed to a mounting plate 40, a mounting portion 43 fixed to an upper portion of a mounting cylinder 42, and a flange 41 and a mounting portion thereof. 43 is rotatably connected by a pin 44, and the upper end of the column 5 is fitted into the mounting cylinder 42 and fixed with bolts 24 as shown in FIG. The avalanche prevention fence is fixed to the other side piece 2 of 2 with a bolt 25 as a truss structure, and the angle between the main pillar 2 and the pillar 5 is made by rotating the mounting plate 40 and the mounting cylinder 42 up and down. The avalanche prevention fence has a truss structure. Plates 26 are attached to the upper and lower positions of the other side piece 7 of the pair of main columns 2, 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. ing.

Next, a method of installing an avalanche prevention fence on the slope 1 will be described. Holes 50 called "Negiri" are excavated at the installation locations of the main pillars 2 and the pillars 5 on the slope 1, and rubble stones are laid at the bottom of each hole 50 to form a foundation rubble stone 51, on which a formwork (not shown) is assembled to make concrete. The concrete foundation 10 is cast in situ by pouring. At this time, a box-shaped sleeve is used at a portion where the main pillars 2 and the pillars 5 are inserted, and a hole 11 larger than the outer dimension of each pillar is provided. At this time, the box-shaped sleeve needs to have a certain angle from the vertical direction, but this is sufficiently possible by fixing a reinforcing bar or a wooden pile to the negligible hole 50 with a batten line or the like.

For assembly, first, the cover bodies 9 are attached to the lower ends of the main columns 2 and 2, respectively. After that, the height of the main pillar 2 is adjusted by adjusting the downward protruding length of the stud bolt 32 of the height adjuster 30 so that the main pillar 2 is embedded to a predetermined depth. At this time, it is more efficient in terms of work to put an iron plate 52 having a thickness of about 5 mm at the bottom of the hole 11. Next, the same operation is performed on the lower end of the column 5, and the mounting cylinder 42 of the bracket 20 is fitted to the upper end of the same. Each of them is inserted into the hole 11 of the concrete foundation 10, and the main pillar 2 and the mounting plate 40 are connected by the bolt 25. For safety, it is preferable to make each pillar self-supporting so that each pillar does not tilt during this assembly work. Next, several horizontal members 3 are attached between the main pillars 2 and the main pillar intervals are adjusted to a predetermined size, and the main pillar intervals are fixed by a rod 28 having a turnbuckle 27 and left. Attach the horizontal member 3 that was used. By the above-mentioned assembly work, an avalanche prevention fence with a predetermined main pillar spacing and a main pillar and a pillar having a predetermined angle is assembled. Next, the installation angle of the columns 5 and 5 with respect to the slope is finely adjusted while looking at the level from the side of the avalanche prevention fence, and fixed with rope etc. so that it does not move and mortar or resin mortar is used as a hole. The space between 11 and the cover body 9 is filled to complete the foundation.

In the above embodiment, the cover body 9 was fitted in the hole 11 of the concrete foundation 10 to install the avalanche prevention fence, but it may be arranged as shown in FIG. That is, after assembling the avalanche prevention fence, the height is adjusted with each height adjuster 30, the stat bolts 32 of each height adjuster 30 are brought into contact with each iron plate 52, and the avalanche prevention fence is temporarily placed. You may install the avalanche prevention fence by striking the concrete foundation 10 on site by forming a fence.

The body 31 of the height adjuster 30 may be directly attached to the main pillar 2 and the pillar 5 without providing the cover body 9, as shown in FIG. In this case, after assembling the avalanche prevention fence, the height may be adjusted with the height adjusting tool 30, temporarily placed as described above, and the concrete foundation may be cast and installed on site.

As described above, the main pillar 2 and the pillar 5 are connected to each other by the bracket 20 in which the mounting plate 40 and the mounting tubular body 42 are connected to each other by the pin 44 to form a truss structure, which has the following advantages. . As shown in FIG. 11, a main pillar 2 and a pillar 5 were attached to a pedestal B, a load was loaded on the fence surface 4, and a bench test was conducted. This bench test is to examine the stress generated in the main pillar 2, the cross member 3, and the pillar 5 by the bracket 20 connecting the main pillar 2 and the pillar 5. The loading weight was 13.6 tons assuming 3.5 m of snow. First, when the bracket 20 of the present invention is used, the gauges C-0 to C-27 are attached to the measurement points indicated by black circles in FIGS. 12 and 13, and the stress at each measurement point is measured. Shown in. Gauges are attached to the upper and lower portions of the left and right main columns 2, respectively, and four gauges are attached to the upper and lower portions of the left and right columns 5, respectively.

[0028]

[Table 1]

Next, the bracket is firmly fixed, for example, the mounting plate 40 and the mounting cylinder 42 are changed to welded ones, and the other components are the same as those described above, and the response is measured under the same load. did. The position of the gauge was exactly the same as in FIGS. 12 and 13. The results are shown in Table 2 below.

[0030]

[Table 2]

From the comparison between Table 1 and Table 2, by adopting the pin support structure in the bracket portion connecting the main pillar 2 and the pillar 5, the stress generated in the main pillar and the pillar depends on the measurement location, but is the maximum. It is clear that it is reduced to about 1/2. Therefore, if the same member is used, the safety factor can be doubled by adopting the pin support structure, and conversely, if the same safety factor is adopted, the wall thickness of the constituent members can be set as The amount can be reduced commensurately, and in this case, the weight can be reduced by about 30%.

Since the main pillar 2 and the pillar 5 are connected by using the bracket 20 in which the mounting plate 40 and the mounting cylinder 42 are connected by the pin 44, the truss structure is an avalanche prevention fence. Therefore, the main pillar made of FRP is used. 2. It is possible to assemble an avalanche prevention fence with a truss structure without reducing the strength of the columns 5.

That is, in order to make the rigid frame structure into a truss structure, each fulcrum may be supported by a point. However, when the member is made of FRP, it is difficult to cut it at a free position like a steel material, perform drilling at a free position, and weld it in terms of strength assurance. Therefore, the optimum bracket 20 for the unidirectional fiber reinforced pultrusion product was developed, and this point was solved. By using this bracket 20, a safer and lighter avalanche prevention fence made of FRP could be developed.

[0034]

[Effect of device]

 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 in manually to the place where the slope 1 is installed, and the main pillar 2 and the pillar 5 can be handed by the worker. Since it can be installed by holding it at a predetermined angle, the avalanche prevention fence can be correctly and easily installed on the slope 1 at a predetermined angle, and the main pillar 2, the pillar 5, and the cross member 3 do not rust. Durability can be improved and maintenance due to rust is unnecessary. Since the heights of the main body 2 and the pillar 5 can be adjusted by the height adjuster 30, the buried depth of the main pillar 2 and the pillar 5 can be easily adjusted.

[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 a side view of a cover body.

FIG. 5 is an enlarged explanatory view of a horizontal member mounting portion by a mounting bracket.

FIG. 6 is a front view of a bracket.

FIG. 7 is a right side view of FIG.

FIG. 8 is a left side view of FIG.

FIG. 9 is a side view showing another example of the installation structure.

FIG. 10 is a side view showing another example of the height adjuster.

FIG. 11 is a side view showing a bench test state.

FIG. 12 is a side view illustrating the attachment of gauges during a bench test.

FIG. 13 is a plan view illustrating attachment of a gauge during a bench test.

[Explanation of symbols]

1 ... Slope, 2 ... Main pillar, 3 ... Horizontal member, 4 ... Fence surface, 5 ... Pillar,
9 ... Cover body, 10 ... Concrete foundation, 11 ... Hole, 3
0 ... Height adjuster, 31 ... Main body, 32 ... Stud bolt,
33 ... Nut.

Claims (5)

[Scope of utility model registration request] 1. A shelf surface 4 for receiving snow by mounting a plurality of horizontal members 3 made of FRP between a plurality of main pillars 2 made of FRP, and a pillar 5 made of FRP on each of the main pillars 2.
FRP avalanche prevention fences are connected to each other, and height adjusting tools 30 are attached to the lower portions of the main pillars 2 and the pillars 5, respectively.
And an avalanche prevention fence installation structure in which pillars 5 are installed on a concrete foundation 10 that is cast on the slope 1. 2. A concrete foundation 10 cast on a slope 1.
Insert the height adjuster 30 into the hole 11 of the
The avalanche prevention fence installation structure according to claim 1, wherein 0 is brought into contact with the bottom of the hole 11. 3. The avalanche prevention fence assembled by contacting the height adjusting tool 30 with the rubble stone foundation 51 cast on the slope 1 is temporarily placed, and the rubble stone foundation 51 is installed on the concrete foundation 10 by spot casting. Installation structure of avalanche prevention fence described in 1. 4. A concrete foundation 10 mounted on the slope 1 by attaching a metal cover body 9 to the lower part of each of the main columns 2 and columns 5, mounting a height adjusting tool 30 on each of the cover bodies 9, respectively. The avalanche prevention fence installation structure according to claim 1 or 2, wherein the cover body 9 is inserted into the hole 11 and the height adjuster 30 is brought into contact with the bottom of the hole 11. 5. A height adjuster 30 comprising a main body 31 and a support body provided on the main body 31 so as to be vertically adjustable.
Alternatively, the avalanche prevention fence installation structure according to claim 2, claim 3, or claim 4.