JP2004036266A - Buffer structure of shed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buffer structure which enhances durability by allowing an impact load, which is imposed on a shed laid on a cold mountain road etc. on which snow is accumulated, to be decentralized by a simple structure. <P>SOLUTION: In the shed 8, a buffer layer B is provided on a lock-shed top slab 9. In the buffer structure of the shed 8, the buffer layer B comprises: a resin-foamed molding layer (expanded polystyrene (EPS) layer) 10 which is composed of expanded polystyrene etc.; a sandwich slab 11 which is superposed on the layer (10) and composed of a structure coupled by upper and lower steel plates 111 and 112, a bolt 13 or the like; and a paving sand layer 19 which is superposed on the sandwich slab 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shock absorbing structure of a shed for reducing an impact load caused by a falling rock on a top plate of a snow shed or a rock shed laid on a coast road or a mountain road, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a number of snowsheds or rocksheds have been laid on coastal roads and mountain roads such as snowy and cold to prevent disasters caused by avalanches, snow and ice, or falling rocks. Since the snowshed and the rockshed have different laying purposes, their design philosophy and laying locations or their structures are similar but different. In particular, snowsheds laid in snowy and cold regions have insufficient load-bearing capacity at present to withstand the large shock loads required by rocksheds, and it is necessary to secure the required buffering capacity equivalent to rocksheds. . For this reason, in the snowy cold region or the like, there is a demand for a change in laying from a snowshed to a rockshed and reinforcement measures for the snowshed.
However, reinforcement measures for snowsheds generally involve reinforcement of existing structures, and there are restrictions on traffic regulations, and there is no room for construction and expansion, so large-scale reinforcement work is difficult. At the same time, the so-called dead load acting on the construction structure and the weight of the reinforcing member accompanying the reinforcement increase, and there are various economic and reinforcement problems such as a burden on the foundation work and a decrease in seismic resistance.
[0003]
Thus, in the prior art from the viewpoint of the description, the structure of a shed including a snowshed and a rockshed is improved. For example, as shown in FIG. Is adopted. This will be described.
Reference numeral 1 denotes a shed having a rock shed top plate 2. Reference numeral 3 denotes a resin foam molded article layer (EPS layer) made of expanded polystyrene or the like as a back layer material, which is laminated on the rockshed top plate 2 and has a thickness of about 100 (cm) or more and is relatively large. It is thick. Reference numeral 4 denotes a reinforced concrete body as a core part, that is, a reinforced concrete slab (RC slab) having a thickness of about 20 (cm) to 30 (cm), on the resin foam molded article layer (EPS layer) 3. Has been cast. Reference numeral 5 denotes a sand layer as a surface layer material, which is laminated on the reinforced concrete plate 4 and has a thickness of about 50 (cm). In the figure, reference numeral 6 denotes a backing soil, which is a side portion of a three-layer buffer structure including the shed 1, the resin foam layer (EPS layer) 3, the reinforced concrete plate (RC plate) 4, and the sand layer 5. Some of the mountains that exist in In addition, a scattering prevention member (not shown) for preventing scattering of earth and sand may be laid on the upper surface of the sand layer 5.
According to the conventional technique shown in FIG. 5, a resin foam molding layer (EPS layer) is laminated on the rockshed top plate 2 to improve the cushioning function of the shed, and the three-layer cushioning structure has It has the feature of being lightweight.
[0004]
[Problems to be solved by the invention]
Since the load reduction structure of the shed according to the prior art has the above-described configuration, the following problem exists.
[0005]
That is, the resin foam molded article layer (EPS layer) 3 laminated on the rockshed top plate 2 once drops the rock 7 in the direction of arrow P on the shed 1, that is, the sand layer 5, When this occurs, there is a high possibility that the buffering and load dispersing effects are diminished, and it is necessary to replace the resin foam molding layer (EPS layer) 3 promptly. This replacement repair work is not easy and the construction cost is low. It was bulky. Further, the resin foam molded article layer (EPS layer) 3 is very expensive, and there is a problem that it is not economical because the laying thickness must be designed to be large.
[0006]
Further, when a falling rock 7 is generated on the jet 1, a strong impact force is applied to the reinforced concrete plate (RC) plate 4 through the sand layer 5, and this causes the reinforced concrete plate (RC) plate 4 to fall. Damage such as cracks occurs on the upper surface, and the buffering and load dispersing effects inherent to the reinforced concrete plate (RC plate) 4 are greatly reduced. (RC version) 4 became non-functional, and it was necessary to remove it, and there were problems such as an increase in the number of man-hours for removal and the cost of removal work.
[0007]
[Means for Solving the Problems]
The present invention relates to a buffer layer which is laminated on a rockshed top plate and excludes a reinforced concrete plate (RC plate) in a snowshed or a rockshed such as a rockshed laid on a coastal road or a mountain road such as a snowy and cold road. Adopts a configuration in which a so-called sandwich plate with a structure is interposed and laminated, and exerts a stable high-quality impact load dispersion effect by increasing the load resistance against the impact load accompanying the occurrence of falling rock etc. on the above-mentioned shed. In addition, an object of the present invention is to provide a buffer structure of a shed in which the thickness of the resin foam molding layer (EPS layer) in the buffer layer is designed to be thin to reduce the construction cost. The following configuration and means are established.
[0008]
According to the invention as set forth in claim 1, a resin foam molded article layer provided on the rockshed top plate, a sandwich plate provided on the resin foam molded layer, and a bed provided on the sandwich plate It is a buffer structure of a shed characterized by comprising a sand layer.
[0009]
According to the invention as set forth in claim 2, a resin foam molding layer laid on the top of the rockshed, and a bolt laid on the resin foam molding layer to connect the upper steel plate and the lower steel plate. And a sand layer layered on the sandwich plate.
[0010]
According to the third aspect of the present invention, it is desirable that the resin foam molding layer laid on the top of the rockshed slab and the resin foam molding layer be laid on the resin foam molding layer to connect the upper steel plate and the lower steel plate. A sandwich plate in which a number of bolts are arranged and the space between the upper steel plate and the lower steel plate is filled and solidified with high-fluidity concrete, and a sand layer overlaid on the sandwich plate. It is a shed buffer structure.
[0011]
According to the fourth aspect of the present invention, a desired number of reaction force transmitting members which are erected on the lock shed top plate and have a space formed on the lock shed top plate, and are superposed on the reaction force transmission member. A buffer structure for a shed comprising a sandwich plate and a sand layer layered on the sandwich plate.
[0012]
According to the fifth aspect of the present invention, a desired number of reaction force transmitting members which are erected on the lock shed top plate and have a space formed on the lock shed top plate, and are superposed on the reaction force transmission member. A shed buffer structure comprising a sandwich plate having a bolt connecting the upper steel plate and the lower steel plate, and a layer of sand spread over the sandwich plate.
[0013]
According to the invention described in claim 6, the sandwich plate has a space formed by the upper steel plate and the lower steel plate filled and solidified with high fluidity concrete, wherein the sandwich plate is solidified. Is a buffer structure of the shed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a buffer structure of a shed according to the present invention will be described with reference to the accompanying drawings.
[0015]
Embodiment 1 of the present invention
FIG. 1 is a side view showing an outline of Embodiment 1 in a shock absorbing structure of a shed according to the present invention. FIG. 2 is a side view of the sandwich plate interposed in the buffer layer provided in Embodiment 1 in the buffer structure according to the present invention, in a case where a space is provided between the upper steel plate and the lower steel plate. It is a side view. FIG. 3 is a side view of a case where highly fluid concrete is filled and solidified in the space between the upper steel plate and the lower steel plate. A description will be given based on FIGS. 1 to 3 to clarify the configuration of the first embodiment of the present invention.
[0016]
Reference numeral 8 denotes a snowshed or rockshed shed having a rockshed top plate 9. Reference numeral 10 denotes a resin foam molded article layer (EPS layer) as a back layer material such as foamed polystyrene, foamed polyethylene or foamed polyphenol, which is provided on the rockshed top plate 9 and has a closed cell structure. are doing. The resin foam molded article layer (EPS layer) 10 is thin, for example, having a thickness of about 50 (cm) or less, and preferably has a density in a range of 15 to 50 kg / m ³ .
[0017]
Reference numeral 11 denotes a sandwich plate, which is provided as a core member on the resin foam molding layer (EPS layer) 10. The sandwich plate 11 has a thickness of about 10 (cm) to 15 (cm), and has a structure as shown in FIG. 2, for example. 111 is an upper steel plate, and 112 is a lower steel plate.
In FIG. 2, the upper steel plate 111 and the lower steel plate 112 are respectively provided with bolt insertion holes 11a and 12a, and bolts 13 such as high-strength bolts are inserted into the bolt insertion holes 11a and 12a. The steel plate 112 is fastened and connected by nuts 14, 14 with washers 15, 15 therebetween from the outer surface. The inner surface of the upper steel plate 111 and the inner surface of the lower steel plate 112 are connected by being tightened with nuts 14 with a washer 15 therebetween. When the bolt 13 connects the upper steel plate 111 and the lower steel plate 112 by tightening them with the nut 14, the space A between the upper steel plate 111 and the lower steel plate 112 is kept constant. Thus, when the sandwich plate 11 is deformed, it tends to concentrate near the loading point, and the amount of deformation is relatively large.
[0018]
To assemble and construct the sandwich plate 11, first, a nut 13 is attached to an end of the lower steel plate 112 from the outer surface of the lower steel plate 112, and the bolt 13 is inserted into the bolt insertion hole 12a with a washer 15 therebetween. Then, the washer 15 is inserted into the bolt 13. Then, it is tightened with the nut 13. Then, an upper steel plate 111 is put on the other end of the bolt 13 from above the nut 14 and the washer 15 fixed above the bolt 13 by using the bolt insertion hole 11 a, and the washer 15 is placed between the outer surface of the upper steel plate 111 and the washer 15. And tighten the nut 14.
Thus, the structure having the bolts connecting the upper steel plate 111 and the lower steel plate 112, that is, the sandwich plate 11 is formed.
[0019]
Thus, by combining the bolt 13 with the upper steel plate 111 and the lower steel plate 112, the rigidity of the entire sandwich plate 11 can be increased. Depending on the thickness of the upper and lower steel plates 111 and 112 and the degree of the space A, the number of the bolts 13 can be reduced. Even if the thickness of the upper and lower steel plates 111 and 112 is designed to be thin, a predetermined rigidity can be maintained, and the cost can be reduced. , Leading to labor savings. In particular, since the sandwich plate 11 has a hollow structure such as a floor plate and a top plate, the weight and the like of the upper and lower steel plates 111 and 112 are reduced, and the dead load on the rockshed top plate 9 is greatly reduced.
[0020]
In the present invention, the nuts 14 and 14 are incorporated into the inner surfaces of the upper and lower steel plates 111 and 112, and the configuration is thus made, so that the positioning of the upper steel plate 111 and the lower steel plate 112 is ensured, and a predetermined space A can be secured. At the same time, the bolt 13 becomes independent on the upper steel plate 111 or the lower steel plate 112, which facilitates assembling.
[0021]
Next, FIG. 3 shows an example in which a filling member 17 made of a material such as concrete, cement, or a resin material such as highly fluid concrete is filled and solidified in the space A shown in FIG. In the case of such a configuration, the upper steel plate 111 and the lower steel plate 112 shown in FIG. 2 are formed between the upper steel plate 111 and the lower steel plate 112 while maintaining a curved state such that a substantially central portion protrudes in advance. It is necessary to fill the space A with the filling member 17. When the filling member 17 is filled and solidified, the upper and lower steel plates 111 and 112 are configured to be substantially linear as shown in FIG. With such a configuration, the sandwich plate 11 further increases rigidity and strength. In particular, the local deformation of the sandwich plate 11 is suppressed and the amount of deformation is small, and the sandwich plate 11 functions as a core material of the buffer structure. The other components in FIG. 3 are substantially the same as those in FIG. 2, and thus are denoted by the same reference numerals and description thereof will be omitted.
[0022]
Reference numeral 19 denotes a sand layer as a surface layer material superposed on the sandwich plate 11, having a thickness of, for example, about 20 (cm), and functioning as a cushioning material against an impact load P to the sandwich plate 11.
Note that a scattering prevention member (not shown) may be provided on the upper surface of the sand layer 19 to prevent the deterioration and scattering of the sand layer 19. The buffer layer B is composed of the resin foam molded article layer (EPS layer) 10, the sandwich plate 11 and the sand layer 19 described above.
[0023]
Further, as an example of the sandwich plate 11 shown in FIG. 2 and FIG. 3 described above, a through bolt having a diameter of about 22 (mm) of the bolt 13 directly connected to the upper steel sheet 111 and the lower steel sheet 112 may be used, for example. At predetermined intervals of about 30 (cm) pitch, the upper and lower steel plates 111 and 112 are fixed to the upper and lower steel plates 112 with nuts 14 and 14, and the thickness between the upper and lower steel plates 111 and 112 is about 10 (cm). ) Filling member 17 such as highly fluid concrete is filled and solidified. With such a configuration, it has been found that the sandwich plate 11 can secure a predetermined rigidity and a distributed load function.
[0024]
Next, the operation of the first embodiment in the cushioning structure of the shed according to the present invention will be described.
When the falling rock 7 falls on the sand layer 19, an impact load P accompanying the fall is applied to the sandwich plate 11 via the sand layer 19. Since the sandwich plate 11 has the structure shown in FIGS. 2 and 3 described above, the impact load P applied to the sandwich plate 11 is such that the upper steel plate 111, the lower steel plate 112, the bolt 13 or the like shown in FIGS. As a result, the entire sandwich plate 11 is supported as a dispersed load. Further, as shown in FIG. 3, in the case of the sandwich plate 11 having a structure in which the filling member 17 such as high-fluidity concrete is filled and solidified in the space A between the upper steel plate 111 and the lower steel plate 112, the rigidity is further increased. Alternatively, even if a strong impact load P of the falling rock 7 is applied, the sandwich plate 11 is appropriately supported as a dispersed load without causing damage or distortion even when a strong impact load P is applied.
[0025]
Thus, the load in which the impact load P is buffered and reduced as the dispersion load by the sandwich plate 11 is applied to the lower resin foam molding layer (EPS layer) 10, and is applied by the resin foam molding layer (EPS layer) 10. The applied load further acts to disperse the load. In this case, the resin foam molded article layer (EPS layer) 10 is formed to have a small thickness, and is stable without deterioration even when a falling phenomenon of the falling rock 7 or a stepwise falling phenomenon is caused several times. Holds and exerts load distribution function and buffer function. Then, the impact load P caused by the initial falling of the falling rock 7 is dispersed and absorbed by the buffer layer B, so that the rockshed top plate 9 located below the resin foam molding layer (EPS layer) 10 is absorbed. Only a greatly reduced load is applied, and the durability of the rockshed top plate 9 is permanently improved.
[0026]
Embodiment 2 of the present invention
FIG. 4 is a side view showing an outline of Embodiment 2 of the shock absorbing structure of the shed according to the present invention. Explanation will be given based on FIG. 4 to clarify the configuration of the second embodiment of the present invention.
[0027]
In the second embodiment of the present invention, in particular, a desired number of reaction force transmission members 22 are erected at, for example, the left and right positions on the lock shed top plate 21 in the shed 20, and the reaction force transmission members 22 are provided above the reaction force transmission members 22. It is characterized in that the sandwich plate 11 is laminated.
[0028]
Reference numeral 20 denotes a snowshed or rockshed shed having a rockshed top plate 21. Reference numeral 22 denotes a reaction force transmitting member formed of a columnar body, a prism, or the like in which a plurality or a desired number thereof are erected on the rockshed top plate 21, for example, on the left and right sides, and is made of iron, concrete, or resin material. It is formed with. A space C having a height corresponding to the standing height is formed between the reaction force transmitting members 22. The sandwich plate 11 is laminated on the upper end of the reaction force transmitting member 22. The sandwich plate 11 is composed of each structure having substantially the same configuration as that of the above-described first embodiment of the present invention, and a description thereof will be omitted.
[0029]
The litter layer 19 is laminated on the sandwich plate 11, and the litter layer 19 has substantially the same structure as that of the first embodiment of the present invention. A member (not shown) may be laid.
In the figure, reference numeral 20a denotes a pillar, and 20b denotes a side wall, which constitute a part of the shed 20. The buffer layer D is composed of the above-described reaction force transmitting member 22, the sandwich plate 11, and the laying sand layer 19. In addition, other components in the second embodiment of the present invention are substantially the same as those in the first embodiment of the present invention, and thus the same reference numerals are given and the description thereof will be omitted.
[0030]
Next, the operation of the shed cushioning structure according to the second embodiment of the present invention will be described.
When the falling rock 7 falls on the sand layer 19, an impact load P accompanying the fall is applied to the sandwich plate 11 via the sand layer 19. Since the sandwich plate 11 has the structure shown in FIGS. 2 and 3 described above, the impact load P applied to the sandwich plate 11 is such that the upper steel plate 111, the lower steel plate 112, the bolt 13 or the like shown in FIG. As a result, the entire sandwich plate 11 is supported as a dispersed load. At this time, the lower surface of the sandwich plate 11 or the lower steel plate 112 has an action of hanging in the space C as shown by the phantom line in FIG. In other words, the space C allows the sandwich plate 11 to escape from the impact load P while allowing the sandwich plate 11 to perform the dispersion load. The reaction force transmitting member 22 supports an impact load applied to the sandwich plate 11, and applies a partial load to a standing portion of the lockshed top plate 21 located below the reaction force transmitting member 22. . Therefore, the substantially central portion of the shed top plate 21 is in a no-load state.
[0031]
Since the impact load P caused by the initial falling of the falling rock 7 is dispersed and absorbed by the buffer layer D, the rockshed top plate 21 located below the reaction force transmitting member 22 is greatly reduced. Only the reduced load is applied, and the durability of the rockshed top plate 21 is permanently improved.
The other operation of the buffer structure of the shed according to the present invention in the second embodiment is substantially the same as that in the first embodiment, and the description thereof is omitted.
[0032]
【The invention's effect】
The shed cushioning structure according to the present invention has the above-described configuration and operation, and thus has the following effects.
[0033]
According to the invention as set forth in claim 1, a resin foam molded article layer provided on the rockshed top plate, a sandwich plate provided on the resin foam molded layer, and a bed provided on the sandwich plate A buffer structure for a shed, comprising a sand layer.
With such a configuration, even if the thickness of the resin foam molding layer (EPS layer) in the buffer layer is set to be thin, the reinforced concrete plate (RC plate) was abolished and the sandwich plate was provided. In addition, the load applied to the shed is effectively reduced as the dispersed load by effectively using the impact load caused by the above, and the construction cost is reduced.
In addition, the buffer function is maintained even for a large impact load due to several or gradual falling of rocks, etc., and under traffic regulations or architectural restrictions accompanying the change from existing snowshed to rockshed. There is an effect that the durability and impact resistance of the shed can be easily improved without requiring any reinforcement work or rock shed reinforcement work and without greatly increasing the dead load.
In addition, since the sandwich plate in the buffer layer is formed into a half prefabricated hollow cross section or a cross section with a filling member interposed, it is not necessary to perform a reinforcing work or a formwork setting work at a shed mounting site, and construction work is not required. This has the effect of being easy to perform and shortening the construction period.
[0034]
According to the invention as set forth in claim 2, a resin foam molding layer laid on the top of the rockshed, and a bolt laid on the resin foam molding layer to connect the upper steel plate and the lower steel plate. The present invention provides a buffer structure for a shed, comprising a sandwich plate having the following structure, and a laying sand layer provided on the sandwich plate.
With such a configuration, there is an effect that the dispersion load effect of the sandwich plate is effectively exerted, and that the shock-absorbing effect of the impact load is prevented from being reduced due to little change over time in the sandwich plate and the like.
In addition, even when a strong impact due to a large-scale rock fall or the like is applied to the shed, the sandwich plate has a structure for connecting bolts and steel plate members, and there is an effect that replacement work and replacement work become extremely easy.
[0035]
According to the third aspect of the present invention, it is desirable that the resin foam molding layer laid on the top of the rockshed slab and the resin foam molding layer be laid on the resin foam molding layer to connect the upper steel plate and the lower steel plate. A sandwich plate in which a number of bolts are arranged and the space between the upper steel plate and the lower steel plate is filled and solidified with high-fluidity concrete, and a sand layer overlaid on the sandwich plate. Provide a shed buffer structure.
With such a configuration, since the steel pipe member is eliminated, the number of assembling steps of the sandwich plate can be reduced, and a predetermined rigidity can be ensured, and an effect of dispersing an impact load and a buffering effect can be obtained.
[0036]
According to the fourth aspect of the present invention, a desired number of reaction force transmitting members which are erected on the lock shed top plate and have a space formed on the lock shed top plate, and are superposed on the reaction force transmission member. A buffer structure for a shed, comprising a sandwich plate and a layer of sand laid on the sandwich plate.
With such a configuration, the sandwich plate can be deformed by the reaction force transmitting member and the space formed on the top plate of the rock shed, so that the sandwich plate can be effectively and appropriately acted as a dispersed load against an impact load caused by falling rocks or the like. This has the effect of improving the durability of the shed.
[0037]
According to the fifth aspect of the present invention, a desired number of reaction force transmitting members which are erected on the lock shed top plate and have a space formed on the lock shed top plate, and are superposed on the reaction force transmission member. The present invention provides a buffer structure for a shed, comprising a sandwich plate having bolts for connecting an upper steel plate and a lower steel plate, and a sand layer laid on the sandwich plate.
With such a configuration, in addition to the effect of the invention described in claim 4, even when a strong shock due to a large-scale rock fall or the like is applied to the shed, the sandwich plate can be used to connect bolts and steel plate members. Therefore, there is an effect that the restoration and removal work becomes extremely easy.
[0038]
According to the invention as set forth in claim 6, the sandwich plate has a space formed by the upper steel plate and the lower steel plate filled and solidified with high-fluidity concrete, wherein the sandwich plate is solidified. To provide a shed cushioning structure.
With this configuration, in addition to the effects of the invention described in the second, fourth, or fifth aspect, there is an effect that the sandwich plate has a more durable structure.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of a first embodiment in a shock absorbing structure of a shed according to the present invention.
FIG. 2 is a side view of a sandwich plate interposed in the buffer layer provided in the buffer structure according to the first embodiment of the present invention, wherein a space is provided between an upper steel plate and a lower steel plate. FIG.
FIG. 3 is a side view of the sandwich plate provided in the first embodiment in the shed buffer structure according to the present invention, in which a space between an upper steel plate and a lower steel plate is filled with high-fluidity concrete and solidified. It is a side view in the case.
FIG. 4 is a side view showing an outline of a second embodiment in a shock absorbing structure of a shed according to the present invention.
FIG. 5 is a cross-sectional view showing an example of a buffer structure of a shed according to a conventional technique.
[Explanation of symbols]
7 Rock fall 8 Shed 9 Rock shed top plate 10 Resin foam molding layer (EPS layer)
Reference Signs List 11 Sandwich plates 11a, 12a Bolt insertion hole 13 Bolt 14 Nut 15 Washer 17 Filling member 18 Washer 19 Laying sand layer 20 Shed 21 Lock shed top plate 22 Reaction force transmitting member 111 Upper steel plate 112 Lower steel plate A, C Space B, D buffer layer P Impact load

Claims (6)

It is characterized by comprising a foamed resin layer superimposed on the top of the rockshed, a sandwich plate superimposed on the foamed resin layer, and a sand layer superimposed on the sandwich plate. Shed buffer structure. A sandwich plate having a resin foam layer superposed on the top plate of the rockshed, a bolt superposed on the resin foam layer, and having bolts for connecting the upper steel plate and the lower steel plate; and the sandwich plate. A shed cushioning structure characterized by comprising a sand layer laid on top of the shed. A resin foam molded layer superimposed on the rockshed top plate; and a desired number of bolts superposed on the resin foam molded body layer for connecting the upper steel plate and the lower steel plate. A sandwich plate formed by filling and solidifying high-fluidity concrete in a space between the sandwich plate and a lower steel plate, and a sand layer layered on the sandwich plate. A desired number of reaction force transmitting members standing on the rockshed top plate and forming a space on the rockshed top plate, a sandwich plate overlaid on the reaction force transmission member, and a stacked plate on the sandwich plate. A shed cushioning structure characterized by comprising a set sand layer. A desired number of reaction force transmitting members erected on the rockshed top plate and forming a space on the rockshed top plate, and an upper steel plate and a lower steel plate superposed on the reaction force transmission member. A shed buffer structure comprising: a sandwich plate having bolts to be connected; and a sand layer layered on the sandwich plate. The shed buffer structure according to claim 2, wherein the sandwich plate has a space formed by the upper steel plate and the lower steel plate filled and solidified with high-fluidity concrete.

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