JP2002088720A - Impact force buffer body against falling stone or the like and work method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new buffering body against impact force caused by falling stones capable of effectively utilizing waste PET bottles with an extremely low cost, for which the disposal is currently thought to be very difficult, and a new work method for building the buffering body. SOLUTION: In a buffering body for protecting a built facility 3 from the impact by falling stones, this buffering body is made by putting a constant number of used PET bottles P in each bag 11 and the impact energy is absorbed by the volumetric change of the PET bottle P, so that the waste PET bottles P, for which the disposal is currently considered to be difficult, can be now effectively utilized; and by the excellent buffering performance possessed by the PET bottles P, the impact energy given by the sediment can be effectively absorbed. Also, there is no increase in the cost as a result of the reinforcement for the prevention for the falling stone 5 since the cost burden for this work is small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber suitable for protecting a rock lining such as a rock shed for preventing damage to a building such as a road or a building caused by a rock falling, In particular, the present invention relates to an impact buffer such as a falling rock which can effectively use a waste PET bottle which has a small dead load and a very low cost and which is currently difficult to treat, and a method of constructing the same.

[0002]

BACKGROUND OF THE INVENTION For example, roads, railways, buildings, and other structures constructed on mountainsides often have locations where there is a danger of falling rocks or falling from the upper slope. At such a collapse danger point, a rock fall lining such as a cave or a rock shed is applied for the purpose of avoiding human damage, damage to the construction facility itself, and interruption of traffic. However, as rock deterioration progresses after the rock fall lining is installed, there may be situations where rock fall or rock fall beyond the design load can be expected. By providing a cushioning material in the portion, the rock fall energy is dispersed and absorbed to prevent the rock fall lining itself from being damaged.

Conventionally, sand has been used as the cushioning material. However, in the case of sand, it is inevitable that the dead load increases with an increase in thickness. Reinforcement is required, which leads to an increase in cost. For this reason, EPS (styrene foam) has begun to be used as the cushioning material. In this case, even if the thickness is increased, a cushioning effect can be obtained without strengthening the structure of the rock fall lining, but EPS is expensive. The cost reduction effect is reduced.

[0004]

The present invention has been made in view of such a background, and is intended to effectively utilize waste PET bottles which are extremely low in cost and which are currently in short supply. The technical task was to develop a new shock-absorbing body for falling rocks and the like, and a method of constructing the same.

[0005]

According to the first aspect of the present invention, there is provided a shock absorber for falling rocks or the like for protecting a building facility from the impact of falling rocks.
A buffer block is formed by collecting a certain amount of bottles in a storage bag, and is characterized by absorbing impact energy by a change in volume of the PET bottle. ADVANTAGE OF THE INVENTION According to this invention, while being able to effectively utilize the waste PET bottle which is currently in short supply, the shock energy of debris etc. can be effectively absorbed by the excellent buffering property which a PET bottle has. . Even if the thickness is increased, the dead load is small, so that the burden on the rock fall lining and the like is small, and the cost increase associated with the reinforcement of the rock fall lining itself does not occur. Further, since the used PET bottle is used, the cost can be significantly reduced.

According to a second aspect of the present invention, in addition to the above requirements, the PET bottle is reduced in volume to about 0.03 by crushing with a foot or the like. It is characterized by the following. According to the present invention, the PET bottle can be brought into a state in which the impact absorbing power due to the elastic effect is the largest. For this reason, it is possible to prevent the debris and the like from contacting the building facility, the falling rock lining, and the like, thereby preventing such damage.

[0007] Further, in addition to the above requirements, a shock absorber for falling rocks or the like according to claim 3 is characterized in that a plurality of the shock absorber blocks are arranged in a multi-stacked state. ADVANTAGE OF THE INVENTION According to this invention, the shock absorbing effect is improved by increasing the volume of the PET bottle which receives a shock, and dispersing a shock to a lower block, and preventing the damage to a building facility or a rock fall lining by rock fall etc. effectively. Can be.

The method for constructing a shock-absorbing body for falling rocks or the like according to claim 4 is used in a construction method in which a shock-absorbing body is provided above a rock-fall lining applied to a construction facility where there is a risk of falling of earth and sand from an upper slope. The present invention is characterized in that a predetermined amount of PET bottles are put together in a storage bag to form a buffer block, and the buffer block is arranged above a rockfall lining. According to the present invention, waste PET bottles, which are currently difficult to treat, can be effectively used, and due to the excellent buffering properties of PET bottles,
The impact energy of debris and the like can be effectively absorbed. Even if the thickness is increased, the load on the rock fall lining is small because the increase in the dead load is small, and the cost increase due to the reinforcement of the rock fall lining itself does not occur. Further, since the used PET bottle is used, the cost can be significantly reduced.

According to a fifth aspect of the present invention, in addition to the requirement of the fourth aspect, in addition to the requirement of the fourth aspect, a grid-like frame material is formed above the rock fall lining. The present invention is characterized in that a plurality of buffer blocks are arranged in a stack in a material. According to the present invention, a safe scaffold can be secured by the lattice-shaped frame material, so that the operation of stacking the buffer blocks in a multi-stage state can be performed safely and reliably. In addition, it is possible to prevent the buffer blocks in a multi-stacked state from being separated from each other, and to reliably prevent damage to the falling rock lining.

[0010] Furthermore, in the construction method of the shock-absorbing body for falling rocks or the like according to claim 6, in addition to the requirement of claim 4 or 5, the PET bottle is temporarily separated from a normal recycling route. PET used after use
The bottle is characterized by being returned to the recycling route again. According to the present invention, since PET bottles can be collected without constructing a new collection route,
The initial cost can be reduced. Also, when recycling PET bottles after use, it is not necessary to construct new equipment, so that costs can be reduced. The problem is solved by using the configuration of the invention described in each of the claims.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a shock absorbing body for rock fall and the like and a method for constructing the same according to the present invention. FIGS. 1 and 2 show the construction of an impact buffer 1 according to the present invention. In a road, which is an example of a construction facility 3 constructed on a hillside 2, a rock fall from an upper slope 21 and a collapse of earth and sand are shown. It shows a state in which a rock fall lining 5 such as a cave or a rock shed is provided at a danger location for the purpose of avoiding human damage, damage to the construction facility 3 itself, and interruption of traffic. . In the rockfall lining 5, the impact force buffer 1 is provided on the roof 55 to absorb the energy of the collapsed soil S and prevent the rockfall lining 5 itself from being damaged.

The rock fall lining 5 is, as shown in FIGS.
As an example, a column 51 erected on a pedestal 50 provided on the lower slope 22 and a column 52 erected on the upper surface of the construction facility 3 at the boundary with the upper slope 21 are formed by beams 53 above the columns 51, 52. A plurality of portal-shaped aggregates are connected along the construction facility 3 and connected by beams 54, and a roof 55 made of a steel plate is provided at the top.
Is a structure formed by placing the. The column 51, the column 52, the beam 53 and the beam 54 are made of H steel as an example, but other suitable steel materials can be used. A brace 56 is provided between the columns 51 or 52 adjacent to each other along the construction facility 3. The pedestal 5
Numeral 0 is provided because the illustrated construction facility 3 is constructed on a steep slope, and is not necessarily provided depending on the topography of the construction site.

Next, the impact force buffer 1 will be described in detail. This is a Poly Ethylene Telephthala used as a container for soft drinks and the like.
Used PET bottles P each containing te as a main component are collectively stored in a storage bag 11 in a predetermined amount in a buffer block 10.
Is formed.

The storage bag 11 employs a so-called sandbag which can double-close the opening. In this embodiment, a storage bag having a capacity of about 1 m ³ is used. In addition, as the storage bag 11, vinyl chloride or the like can be used.
A dedicated member made of a synthetic fiber member made of a waterproof material may be used. As an example, as shown in FIG. 3, after the PET bottle P is accommodated, the folded portion 11a is closed with the string 11c, and the hooks 11b at the four corners are also connected with the iron wires 11d to form the buffer block 10.

The PET bottle P is used by temporarily separating it from a normal recycling route having steps of collection, separation, washing, recycling and the like performed in a local government or the like. The state of the PET bottle P in the recycling route includes a state of an empty container (specific gravity 0.02), a state in which the PET bottle P is crushed by a foot or the like to reduce the volume (specific gravity 0.03), and a state in which the PET bottle P is pressed by a machine (specific gravity). 0.25-0.28)
However, in this embodiment, it was confirmed that the impact buffering force due to the elastic effect was the largest in the loading test,
The one deformed by crushing the foot was used.

A frame member 12 in which iron pipes are assembled in a grid pattern is installed on the upper surface of the roof 55 in the rock fall lining 5, and the buffer blocks 10 are arranged in a multi-stage state in the frame member 12. The lateral displacement is prevented to the extent that excessive restraining force does not work. Further, the upper portion of the frame member 12 is covered with the fiber net 13 to prevent the individual buffer block 10 from scattering, and the wire net 1
4 to prevent the whole from scattering.

[Impact Load Test] Next, the results of the impact load test of the impact buffer 1 constructed as described above will be shown.
As shown in FIG. 4, the test system is configured by stacking the buffer blocks 10 in five steps in a pyramid shape to form the impact buffer 1. The experiments (I) to (IV) shown below were performed, and each test was performed. The amount of displacement from the reference point set for each stage was measured at four locations from each stage. The measurement results are shown in Tables 1 to 4 below. For the second step from the ground surface, the ground surface was used as a reference point, and the height from the ground surface was measured as it was, while for the third, fourth, and fifth steps, the difference from the set reference point was measured. In the third, fourth, and fifth steps, the displacement was at a point below the reference point at most of the measurement points, but at the fourth point in the experiment (IV), the displacement was above the reference point. Therefore, a + sign is added in the table for identification. In the experiment (IV), the fifth buffer block 10 was buried between the fourth buffer blocks 10 and could not be measured.

Experiment (I) The shock absorber 1 was constructed by stacking the shock absorber blocks 10 in five steps in a pyramid shape.
Set the reference point when the stable state is reached. Experiment (II) A concrete block B weighing 8.05 t was gently placed on the impact buffer 1 using a crane C,
The volume change with respect to the static load is measured. Experiment (III) The concrete block B was gently removed from above the impact buffer 1 using the crane C, and the state of restoration when the load was removed was measured. Experiment (IV) Using a crane C, a concrete block B is freely dropped from a position 1.0 m above the impact buffer 1, and a volume change with respect to an impact load is measured.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

[0022]

[Table 4]

From the above experimental results, the upper shock absorber block 10 directly receiving the impact force has a larger volume change.
In the lower part, since the change of the buffer block 10 is small, the individual PET bottles P transfer to the lower part while absorbing the impact load due to the volume change. The absorption time of the loading shock due to the load becomes longer, and the load transmission to the substructure (rock fall lining 5) becomes close to the static load. The load is dispersed on the surface, and it can be seen that the impact absorbing power is larger than that of the conventional method of sand or styrene foam.

[Results at Construction Site] Next, an example in which the impact buffer of the present invention and the construction method thereof according to the present invention are actually applied to a collapse danger point will be described. Figures 1 and 2 above
Is a diagram showing a road (National Highway No. 150 passing between Shizuoka City and Shizuoka City, Shizuoka Prefecture), which is an example of the construction facility 3;
The road, which is the construction facility 3, has a steep terrain due to coastal erosion and a hillside 2 composed of volcanic rocks from the Neogene Miocene Oosaka Formation.
It is a road formed in. The hillside 2 has been weathered frequently, causing landslides, causing road closures, and in the past, human damage on the road as the construction facility 3. For this reason, the applicants have been continuously monitoring the deformation of the hillside 2 and disaster prevention work.
In order to confirm that a crack has occurred in a part of the upper slope 21 of the 0 m portion and the danger of collapse has increased, the construction facility 3
The rockfall lining 5 was applied to the road, and the impact buffer 1 was installed on the rockfall lining 5.

As an actual construction mode, a rock fall lining 5 is installed on a road that is a construction facility 3 having a width of 6.8 m, and a roof 55 of the rock fall lining 5 has a thickness of about 1000 m ^3.
The PET bottles P were placed in the buffer block 10 in the storage bag 11. After that, it actually collapsed, and the steel pipe used as a scaffold was about 1000
Although m ³ of the collapsed sediment S flowed down, there was no damage to the rock fall lining 5 and the road as the construction facility 3, and it was demonstrated that the impact buffer 1 of the present invention exhibited a sufficient effect. Incidentally, in order to avoid human damage, the road as the construction facility 3 has been closed for traffic several days before the collapse occurred.

In the above construction site, about 1000 m ³
Although the PET bottle P was used, the cost was reduced by about 40 million yen compared to the calculation using the same amount of styrene foam.

[0027]

[Other Embodiments] The present invention is based on the above-described embodiment, but the following embodiments may be adopted based on the technical idea of the present invention. it can. That is, in the above-described embodiment, the impact force buffer 1 of the present invention is mounted on the top of the rock fall lining 5, but the rock fall protection fence provided on the hillside 2 as shown in FIG. The impact buffer 1 may be provided for the rock fall protection fence 6 in order to reduce the amount of impact transmitted to the rock fall protection fence 6 by absorbing the impact due to rock fall or the like. Thus, falling rocks and the like can be more reliably stopped. Also, as shown in FIG. 5 (b), if the vehicle 7 is installed at a place where the vehicle 7 may enter, such as the outer guardrail 3A at a sharp curve point, a buffering effect can be exerted on both the building facility 3 and the vehicle 7. Both can be protected.

Further, although not shown, the impact buffer 1 is placed on a roof or a roof of a private house or a public facility built at a place where a falling rock or an avalanche is likely to occur, or installed on an outer wall portion. By doing so, damage to the building can be prevented. In such an embodiment, since the shock absorber 1 can be obtained easily and inexpensively by storing the used PET bottles P for each household, a very effective means against damage is provided. It can be.

[0029]

According to the present invention, there is provided a new shock-absorbing body for falling rocks and the like and a method for constructing the same, which can effectively utilize waste PET bottles which are currently in short supply. Damage to the lining 5 and the construction facility 3 can be prevented at low cost, and human damage can be avoided.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view showing a construction facility on which a rock fall lining to which an impact buffer of the present invention is applied is constructed.

FIG. 2 is a cross-sectional side view of the same.

FIG. 3 is a perspective view showing a storage bag.

FIG. 4 is a front view showing a state of an impact load test.

FIG. 5 is a cross-sectional side view and a perspective view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impact buffer 10 Buffer block 11 Storage bag 11a Folding part 11b Hook part 11c String 11d Iron wire 12 Frame material 13 Fiber net 14 Wire net P PET bottle 2 Hillside 21 Upper slope 22 Lower slope 3 Building facility 3A Guard rail 5 Falling stone covering Construction 51 Pillar 52 Pillar 53 Beam 54 Beam 55 Roof 56 Brace 6 Rock fall protection fence 7 Vehicle B Concrete block C Crane S Collapsed soil

Claims (6)

[Claims] 1. A buffer for protecting a building facility from impacts such as falling rocks, wherein the buffer is formed by gathering a predetermined amount of used PET bottles in a storage bag to form a buffer block. An impact force buffer for falling rocks or the like, which absorbs impact energy by changing the volume of the bottle. 2. The shock-absorbing body for falling rocks or the like according to claim 1, wherein the PET bottle has a volume reduced to a specific gravity of about 0.03 by crushing with a foot or the like. 3. The shock-absorbing body for falling rocks or the like according to claim 1, wherein a plurality of said buffer blocks are arranged in a multi-stacked state. 4. A method of providing a buffer on a rock fall lining applied to a construction facility having a risk of landslide from an upper slope, wherein a predetermined amount of used PET bottles are put together in a storage bag and a buffer block is provided. And a method for constructing a shock-absorbing body for falling rocks or the like, wherein the shock-absorbing block is arranged above a rock-fall lining. 5. A rock falling stone or the like according to claim 4, wherein a grid-like frame material is formed above the rock falling lining, and a plurality of buffer blocks are arranged in a multi-tiered state in the frame material. Construction method of impact buffer. 6. The PET bottle according to claim 4, wherein the PET bottle is used by temporarily separating it from a normal recycling route, and the used PET bottle is returned to the recycling route again. Construction method of impact buffer for falling rocks.