JP2731077B2 - Civil engineering structure with foam resin block and civil engineering method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foaming method capable of reducing the gas concentration by discharging a flammable stagnant gas vaporized by a residual foaming agent into a civil engineering structure containing a foamed resin block. The present invention relates to a civil engineering structure having a resin block and a civil engineering method thereof.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 63-251521, a foam resin block made of expanded polystyrene is laminated on a civil engineering structure such as an embankment in place of earth and sand as an embankment. It is known to be used.

[0003] In such civil engineering structures, the foamed resin block is light in weight, such as about 1/100 the density of embankment material such as earth and sand, so that it is not necessary to strengthen the foundation ground such as soft ground. Since the foamed resin block is excellent in self-sustainability, water resistance, heat insulation, workability, and the like, it is applied to soft ground areas such as landfills.

[0004] In civil engineering structures in which such foamed resin blocks are laminated, the groundwater level of the soft ground rises due to rainfall and the like, and the foamed resin blocks are often flooded, so that lightweight foamed resin blocks (apparent specific gravity) are used. It has been proposed to provide a cavity having an inflow port and an outflow port in each foamed resin block in order to prevent 0.02 to 0.05) from floating due to buoyancy during flooding.

[0005] With this, when water is introduced, the apparent specific gravity of the foamed resin block can be increased by introducing water into the above-mentioned cavity, and the water that has entered through the cavity can be quickly drained to the outside. Drainage holes are provided on the side of the civil engineering structure. Therefore, the civil engineering structure provided with the above-mentioned foamed resin block can suppress the rise of the water level in the civil engineering structure, and can avoid the influence of the rise of the groundwater level on the soft ground.

When the above foamed resin block is manufactured, a foaming agent which is a hydrocarbon having a low boiling point such as butane or pentane is used, and the foaming agent has a large foaming resin block size. It remains in the resin block.

[0007]

However, in the above-mentioned conventional structure, the drain hole is provided at a position as low as possible in order to quickly drain the submerged water. Because it is heavier, it stays in the lower part of the stacked foamed resin blocks in the civil engineering structure.

Therefore, in the above configuration, when the gas concentration in the foamed resin block group increases, the above gas has flammability. This may cause a fire accident.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has been made by the present inventors in a civil engineering structure using a foamed resin block to vaporize a foamed resin block from a foaming agent. Various studies have been conducted on methods for reducing the concentration of gas that has been reduced, focusing on the fact that the above-mentioned civil engineering structure is installed on the ground such as soft ground where the groundwater level fluctuates and rises significantly, leading to completion. It is a thing.

That is, in the civil engineering method for a civil engineering structure provided with a foamed resin block according to the first aspect of the present invention, the foamed resin blocks are stacked, and the foamed resin block group is formed by utilizing the fluctuation of the groundwater level. Is discharged to the outside.

According to a second aspect of the present invention, there is provided a civil engineering structure including a foamed resin block, in order to solve the above problems, a block made of a foamed resin is laminated on a construction base surface, and a side surface of the block group is provided. A side wall is provided on the side, and an exhaust hole is provided in the side wall for discharging the staying gas in the block group to the outside due to fluctuation of the groundwater level.

According to a third aspect of the present invention, there is provided a civil engineering structure having a foamed resin block according to the third aspect of the present invention. A ventilation layer that promotes gas diffusion and movement is sandwiched in the block group according to the mounting position of the block.

According to a fourth aspect of the present invention, there is provided a civil engineering structure including a foamed resin block according to the third aspect of the present invention, wherein the ventilation layer is provided. However, the present invention is characterized in that ventilation blocks in which gas passages are formed are juxtaposed to promote diffusion and movement of gas.

According to a fifth aspect of the present invention, there is provided a civil engineering structure provided with a foamed resin block, in order to solve the above-mentioned problems, a structure having a bottom portion and a side wall is placed on a construction base surface, and foaming is performed. A block made of resin is laminated in the structure, and a communication hole communicating between the inside and the outside of the structure is provided at the bottom, and the staying gas from the group of blocks is discharged to the outside due to fluctuation of the groundwater level. An exhaust hole is provided in the side wall.

According to a sixth aspect of the present invention, there is provided a civil engineering structure having a foamed resin block, wherein the block made of the foamed resin is laminated on an inclined construction base surface to solve the above-mentioned problems. A retaining wall is provided on a substantially upright side surface of the ventilation wall, and an exhaust hole for discharging stagnant gas from the block group to the outside due to fluctuation of the groundwater level is provided in the retaining wall, and a ventilation block in which a gas passage is formed is A ventilation layer arranged in parallel so as to promote gas diffusion transfer is sandwiched in the block group at a position corresponding to the exhaust hole.

According to a seventh aspect of the present invention, there is provided a civil engineering structure provided with a foamed resin block, in order to solve the above-mentioned problems, a structure having a bottom portion and a side wall is placed on an excavated construction base surface, A block made of a foamed resin is laminated in the structure, and a communication hole communicating between the inside and the outside of the structure is provided at the bottom, and the stagnant gas from the group of blocks is discharged to the outside due to fluctuations in the groundwater level. An exhaust hole is provided on the side wall, and a ventilation layer formed by juxtaposing ventilation blocks having gas passages formed therein so as to promote diffusion and diffusion of gas is sandwiched in the block group at a position corresponding to the exhaust holes. It is characterized by being worn.

In order to solve the above-mentioned problems, a civil engineering structure having a foamed resin block according to claim 8 of the present invention has a block made of foamed resin laminated on a construction base surface in which an installation surface is dug down, A side wall covering the side surface of the block group was provided, and an exhaust hole for discharging stagnant gas from the block group to the outside due to fluctuation of the groundwater level was provided near the installation surface of the side wall, and a gas passage was formed. A ventilation layer in which ventilation blocks are juxtaposed so as to promote gas diffusion movement is sandwiched in the block group at a position corresponding to the exhaust hole.

[0018]

According to the construction method of the first aspect, the gas vaporized from the foaming agent remaining in the block made of the foamed resin is heavier than air and stays in the stacked block group, but the groundwater level fluctuates. When the gas rises, the gas retained in the block group rises, so that the gas can be released to the outside.

Therefore, the above-described method can reduce the concentration of the gas in which the vaporized gas of the foaming agent stays in the civil engineering structure by utilizing the fluctuation of the groundwater level.

According to the second aspect of the present invention, the gas vaporized from the foaming agent remaining in the block made of the foamed resin is heavier than air and stays in the block group having the side wall, but the groundwater level fluctuates. When it rises, the staying gas rises in the block group and can be discharged to the outside through the exhaust hole.

According to the third and fourth aspects of the present invention, in addition to the function of the second aspect of the present invention, the gas reaching the block group corresponding to the position of the exhaust hole is easily diffused and moved through the ventilation layer. And the gas can be rapidly discharged to the outside from the exhaust hole.

According to the configuration of the fifth aspect, the gas vaporized from the foaming agent remaining in the block made of the foamed resin is heavier than air, and stays in the structure where the blocks are laminated. Fluctuates and rises, the rise in the groundwater level is transmitted through the communication hole provided at the bottom of the structure, the gas inside the structure rises, and the above gas is discharged to the outside from the exhaust hole provided on the side wall of the structure. Can be released.

According to the above construction, since the gas vaporized from the remaining foaming agent in the block made of the foamed resin is heavier than air, the gas stays in the retaining wall on which the block is laminated. When the water fluctuates and rises, water enters the retaining wall and rises, and the retained gas is pushed up and rises, and the gas reaching the block group corresponding to the position of the exhaust hole provided on the retaining wall is passed through the ventilation layer. The gas diffuses and moves quickly in the horizontal direction, and the gas can be discharged to the outside from the exhaust hole.

According to the above configuration, the gas vaporized from the foaming agent remaining in the block made of the foamed resin is heavier than air, and thus stays in the structure where the blocks are laminated. When the water fluctuates and rises, the rise in the groundwater level is transmitted through the communication hole provided on the bottom of the structure, and the gas remaining in the structure rises, which corresponds to the position of the exhaust hole provided on the side of the structure The gas that reaches the block group to be diffused and moved quickly in the horizontal direction by the ventilation layer,
The gas can be released to the outside from the exhaust hole.

According to the above construction, since the gas vaporized from the remaining foaming agent in the block made of the foamed resin is heavier than air, the block group laminated on the construction base surface where the installation surface is dug down. Gas stays in the side wall, but when the groundwater level fluctuates and rises, the gas staying in the block group in the side wall rises and reaches the block group corresponding to the position of the exhaust hole provided in the side wall. The gas can be quickly diffused and moved in the horizontal direction by the ventilation layer, and the gas can be released to the outside from the exhaust hole.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, a block 1 made of expanded resin in which expanded polystyrene particles are formed by an in-mold method or an expandable polystyrene resin is formed by an extrusion method is used for the civil engineering structure. Low boiling hydrocarbons such as pentane are used. The density of the foamed resin block 1 used is
It is adjusted to 10-40 kg / m ³ (Test method JIS K7222).

The shape and dimensions of the foamed resin blocks 1 are desirably large as long as the noise can be avoided by using a crane or the like at the time of stacking, and from the viewpoint of workability, the civil engineering worker can carry it alone. ,length
It is desirable that the molded article has a thickness of 1.6 to 2.2 m, a width of 0.8 to 1.1 m, and a thickness of 0.4 to 0.6 m.

However, when the blocks 1 made of foamed resin are laminated in a plurality of stages as described later to form a civil engineering structure such as embankment, the civil engineering structures are integrated so as to maintain the strength. It is necessary to prevent the upper and lower joints from overlapping, and it is desirable to determine the shape and dimensions so that the ratio between the length and the width of the foamed resin block 1 is 2.

When the above-mentioned foamed resin blocks 1 are laminated, in order to increase the air permeability and water permeability between them, all the ridges of the foamed resin blocks 1 have a cross-sectional radius of about 3 cm. It is desirable to form R2. The radius 2 may have a sectional arc radius of 1 to 5 cm, more preferably 2 to 4 cm.

That is, when the foamed resin blocks 1 are stacked in a plurality of layers, if the radius 2 is smaller than 1 cm, the space formed by the facing ridges is small.
The positive effect of the space as a water hole or vent hole is small. If the radius 2 is larger than 5 cm, the contact area of the foamed resin blocks 1 between the upper and lower stages decreases greatly, and the load per unit area increases. This is not desirable because the compressive strength of the block 1 is reduced.

In the above configuration, the example in which the radius 2 is formed on the ridge of the expanded polystyrene block 1 has been described. However, a chamfer is formed on each ridge at an angle of, for example, 45 ° C. with respect to a surface adjacent thereto. You may. Due to the formation of the radius 2 or the chamfer, it is easy to put a hand in a concave portion formed by the radius 2 or the like during transportation, and it is easy to transport.
Since the corners of the expanded polystyrene block 1 are less likely to be damaged, a reduction in commercial value due to deterioration in appearance can be avoided.

In order to ensure water permeability and air permeability, it is not always necessary to form the radius 2 or chamfer as described above. When a plurality of foamed resin blocks 1 are laminated in a plurality of stages to construct a foamed resin block structure, the clearance between the horizontally adjacent foamed resin blocks 1, that is, a slight gap (5 to 20 m) is provided.
m) to form and laminate
This is because water permeability and air permeability can be ensured in the foamed resin block structure.

In the above configuration, an example in which expanded polystyrene is used as the material of the expanded polystyrene block 1 which is a block made of expanded resin has been described. However, other expanded resins such as polypropylene, which are excellent in light weight, compression resistance, etc., are used. It is also possible to use a foamed resin or a styrene-modified polyolefin foamed resin.

Next, the foamed resin block 1 as described above is used.
3 to 5 will be described first.
As shown in the figure, the foamed resin block 1 is arranged on a substantially horizontal foundation base with sand or the like, and then, as a first step, the thickness direction is made vertical and adjacent to each other,
In addition, those that are adjacent to each other in the width direction are laid out while being shifted from each other by half of the length in the length direction.

Next, as a second step indicated by a two-dot chain line in FIG. 3B and FIG. 4, the longitudinal direction of the foamed resin block 1 is set so as to be orthogonal to the first step and one step. Eyes and 2
The joints with the steps are made adjacent to each other so as not to overlap as much as possible, and the other parts are stacked as described above. Next, as shown in FIG. 5, on the second stage, they are stacked adjacent to each other in the same manner as in the first stage.

In this way, the foamed resin blocks 1 are laminated to a required height to construct a foamed resin block structure (block group) 3. When molding the foamed resin block 1 that protrudes from the required shape of the foamed resin block structure 3 or the foamed resin block having a shape that cannot be accommodated in the above-described standard shape, an unnecessary portion is formed by a hot nichrome wire or the like. Cut and shape with.

Next, the above foamed resin block structure 3
An example of installing a civil engineering structure using soft ground on soft ground such as a landfill along a coastline where the groundwater level rises during rainfall or high tide will be described. As shown in FIG. The installation base surface 27 at least at the position exceeding the maximum groundwater level 8 shown by the dashed line is dug down to the level of the normal groundwater level 7 shown by the broken line in the figure, and the construction base surface 4 is made flat.
To form

As shown in FIG. 6B, a crushed stone layer 5 having a predetermined thickness is formed on the construction base surface 4 so that the surface is adapted.
Although not shown, a leveling layer made of sand or the like is formed on the crushed stone layer 5, and a box-shaped concrete structure 6 having a substantially U-shaped cross section is placed so that its bottom 6d abuts on the leveling layer. Install. In this concrete structure 6,
The leveling layer 5a is formed by sand or the like. FIG.
As shown in (c), it is also possible to place the concrete structure 6 on the construction base surface 4 without providing the crushed stone layer 5.

When the civil engineering structure is constructed during the construction of the landfill, when the landfill is completed up to a position which usually exceeds the groundwater level 7, the construction base surface 4 as described above is formed as shown in FIG. Then, the concrete structure 6 may be provided on the construction base surface 4. At this time, after the concrete structure 6 is constructed, the outside of the concrete structure 6 is covered at least to a position where the assumed maximum groundwater level 8 is reached in order to smoothly carry out the construction.

Thereafter, as shown in FIG. 1, the foamed resin blocks 1 are laminated as described above to construct a foamed resin block structure 3. Subsequently, a holding load 11 such as a concrete slab or a roadbed is placed on the foamed resin block structure 3 so as to resist the buoyancy of the foamed resin block 1 due to intruding groundwater as described later.

The holding load 11 is a safety factor of at least 1.2 with respect to the buoyancy of each foamed resin block 1 at the highest water level 8 in the assumed concrete structure 6.
It is set to be twice as heavy.

Thereafter, the groundwater level rises at the time of high tide, rainfall, and the like with respect to the normal groundwater level 7, so that the periphery of the concrete structure 6 is backfilled to at least the assumed maximum groundwater level 8. Cover the soil, and then hold down the load 1
(1) Finishing work such as pavement work for roads and the like.

Then, the bottom 6d of the concrete structure 6
Is provided with a plurality of water introduction holes (communication holes) 6a for introducing groundwater into the concrete structure 6 due to the rise of the groundwater level, and a side wall 6c of the concrete structure 6 is provided with a concrete structure 6. A plurality of exhaust holes 6 b are provided at positions corresponding to the maximum underground water level 8 for discharging the gas remaining after the gasification of the foaming agent inside to the outside.

The above gas is a vaporized material of the foaming agent remaining in the foamed resin block 1 and is heavier than air. Therefore, the gas in the foamed resin block 1 in the foamed resin block structure 3 and the foamed resin The material stays in the gap in the block structure 3 and is pushed up as described later by the rise of the groundwater level to the maximum groundwater level 8, and is discharged to the outside through the exhaust holes 6b.

In addition, the foamed resin block structure 3 is provided with a gas permeable layer 10 for easily moving gas in the horizontal direction.
One layer is sandwiched between the stacked foamed resin blocks 1 at the height position of the exhaust holes 6b. As shown in FIG. 5, the ventilation layer 10 has one end face in the thickness direction of the foamed resin block 1. It is composed of a ventilation block 9 having a groove (gas passage) 9a formed thereon in a substantially well shape.

The gas-permeable layer 10 is not particularly limited as long as the gas can diffuse and move in the horizontal direction.
For example, the grooves 9a of the ventilation blocks 9 are arranged so as to open upward, and are formed so as to communicate with adjacent gas passages formed by the grooves 9a.

Although not shown in each exhaust hole 6b,
A gas detector that constantly detects gas from the foaming agent may be provided to detect the concentration of gas discharged to the outside from the exhaust hole 6b, and to monitor the gas concentration in the concrete structure 6. Further, such a monitor may be performed by detecting the gas concentration in the vicinity of each of the exhaust holes 6b by the gas detector at predetermined time intervals.

Incidentally, there is a slight gap, for example, a gap of about 5 to 20 mm, between the horizontally adjacent foamed resin blocks 1 in the laminated foamed resin block structure 3. Earl 2 for each ridge in block 1
Are provided, a space is formed between the facing rounds 2. Therefore, in the foamed resin block structure 3, it is possible to easily move the gas or air that has accumulated through the above-mentioned gaps and spaces.

In addition, since the vaporized gas of the foaming agent is almost insoluble in water, when the groundwater level normally rises from the groundwater level 7, the gas remaining in the foamed resin block structure 3 in the concrete structure 6 is reduced. As described above, it is pushed up and rises. The gas that has reached the gas permeable layer 10 quickly diffuses and moves in the horizontal direction through the gas passage, which is a space formed by the groove 9a of the gas permeable block 9, and moves to each exhaust hole 6b.
… Quickly released to the outside. At this time, the rise of the groundwater level does not necessarily have to reach the maximum groundwater level 8, and for example, even if the gas of the crushed stone layer 5 is pushed up by the rise of the groundwater level, the gas can be released to the outside as described above. .

As described above, in the construction of the above embodiment and the civil engineering method, since the foamed resin block structure 3 is formed by laminating the superlight foamed resin blocks 1, the construction base surface which is a soft base 4, the load per unit area of the civil engineering structure can be greatly reduced, the reinforcement of the construction base surface 4 can be omitted, problems such as ground subsidence after construction can be avoided, and the concrete structure 6 Since the foamed resin block structure 3 is mounted on the construction base surface 4 and integrated, the irregularity of the upper surface of the foamed resin block structure 3 due to partial depression which tends to occur on soft ground or the like is also prevented. You.

In addition, in the above configuration and the civil engineering method, since the exhaust hole 6b is provided according to the water introduction hole 6a and the maximum groundwater level 8, the block made of the foamed resin due to the fluctuation of the groundwater level such as rainfall and ebb and flow. By using the rise of the groundwater in the structure 3, the vaporized gas of the foaming agent in the foamed resin block structure 3 can be released to the outside. Further, as the groundwater level falls, air is introduced from the exhaust holes 6 b. You.

Therefore, in the above configuration and construction method, the gas concentration of the foamed resin block structure 3 which is a group of the foamed resin blocks in the concrete structure 6 can be automatically reduced by utilizing the fluctuation of the groundwater level. . Accordingly, the concentration of the flammable gas can be reduced, so that even if a fire source such as a welding machine is provided nearby during construction or the like, a fire accident due to ignition from the fire source can be avoided.

In the structure of the above embodiment, the exhaust holes 6b
Although the example in which the mounting position of is provided at a position higher than the maximum groundwater level 8 is given, the position of the exhaust hole 6b may be any position as long as the internal gas can be released to the outside by the rise of the groundwater level. It may be provided at a mountable position between the highest groundwater level 8.

Next, an embankment structure will be described as another example of the civil engineering structure using the foamed resin block structure 3 having the ventilation layer 10 as described above. In each of the other embodiments described below, members having the same functions as those in the above-described embodiment are given the same member numbers, and descriptions thereof are omitted.

FIG. 8 shows an embankment structure on soft ground.
As shown in the figure, for example, usually drilling down to groundwater level 7,
An embankment structure is provided on the construction base surface 4 by a construction method similar to the above. In such an embankment structure, as the holding load 11, a covering layer 11a (R) having a not-shown welded reinforcing bar (φ6, 15 × 15 mm) is used.
C slab or concrete slab), crushed stone 11b for holding load, roadbed 11c, and the like are sequentially stacked.

The above-mentioned covering layer 11a is also provided to protect the foamed resin block structure 3 from gasoline or the like, which is a solvent for foamed polystyrene. In the embankment structure, the waterproof sheet 13 is interposed between the crushed stone 11b for holding load and the concrete floor slab 11a, while the backfill soil 14 is interposed between the side wall 6c and the construction base surface 4.
Is filled.

Further, similarly to the above embodiment, each of the exhaust holes 6b.
The concentration of gas exhausted from is monitored. After the completion of the construction, a cover 15 is placed on the slope of the foamed resin block structure 3.
Is applied. In this way, the embankment structure is completed.

Even in such an embankment structure, the concentration of gas retained in the foamed resin block structure 3 can be reduced by utilizing the fluctuation of the groundwater level, similarly to the above-mentioned civil engineering structure, and a fire accident occurs. Is prevented.

Next, as another embodiment of the civil engineering structure using the foamed resin block structure 3 provided with the ventilation layer 10 as described above, a retaining wall capable of reducing the earth pressure on a sloped ground or the like will be described. The following describes the civil engineering structure.

In such a civil engineering structure, as shown in FIG. 9, a drain material 18 such as a nonwoven fabric is spread along the construction base surface 4 which is an inclined surface.
A step section is formed by the crushed stone layer 5 for backfilling.

As shown in FIG. 6 (a), a leveling layer 5a made of sand or the like is provided on the stepped surface, and as shown in FIG. 9, the foamed resin blocks 1 are laminated as described above. The block structure 3 made of foamed resin is formed.

At this time, concrete layers 20 for evenly distributing the loading load are provided at the positions corresponding to the installation heights in the intermediate portion of the foamed resin block structure 3. Is the anchor 21
Is fixed to the construction base surface 4. Each of the concrete layers 20 is provided with an opening (not shown) through which water or gas passes in the thickness direction.

A retaining wall 17 made of concrete or the like is provided on the upright side surface of the foamed resin block structure 3. The retaining wall 17 is provided with a drain hole 17 a, while the lower end of the retaining wall 17 is provided. A drain groove 17b is provided along the outer wall.

Each of the drain holes 17a is closed for a predetermined period during the construction, and the highest expected level is formed in the foamed resin block structure 3 between the retaining wall 17 and the construction base surface 4. Groundwater up to a groundwater level of 8 can be stored. Therefore, the pressing load 11 placed on the foamed resin block structure 3 is set to a sufficiently large mounting weight with respect to the assumed buoyancy, for example, about 1.2 times the assumed maximum buoyancy.

A ventilation layer 10 is provided at a position corresponding to the maximum groundwater level 8. A retaining wall 17 of the ventilation layer 10 facing the groove 9 a of the permeable block 9 has an exhaust hole 6.
b is provided. Thus, in the above-described configuration, similarly to the above-described embodiment, during the above-described predetermined period, the gas retained in the foamed resin block structure 3 can be released to the outside by using the fluctuation of the groundwater level, and the foamed resin Block structure 3
Can reduce the gas concentration and prevent the occurrence of fire accidents.

Next, as shown in FIG. 10, an H-shaped steel 22 is used as a supporting column in place of the retaining wall 17, and the present invention is applied to a civil structure for expanding a road width on an inclined land. An example will be described.

In such a civil engineering structure, H-shaped steels 22 as supporting columns are provided at predetermined intervals so as to reach the base 28, and a concrete panel (not shown) is mounted between the above-mentioned ground portions and the retaining wall is provided. A drain hole 17a is provided in the lower part of such a concrete panel.

In the same manner as described above, by closing the drain hole 17a for a predetermined period during the construction, the above structure raises the water level in the foamed resin block structure 3 to the expected maximum groundwater level 8. Thus, the gas retained inside can be discharged to the outside through the exhaust hole 6b, and the gas concentration in the foamed resin block structure 3 can be reduced, thereby preventing a fire accident.

Next, the above configuration and the civil engineering method will be described with reference to FIG.
As shown in FIG. 5, another embodiment applied to an embankment structure in a landslide zone on a gentle slope having a high maximum groundwater level 8 will be described.

In the embankment structure, first, the installation surface 23 is dug down to level the ground, and the construction base surface 4 and the dump yard 24 for drainage are provided. The work base surface 4 is leveled by a leveling layer 5a made of sand or the like, and the foamed resin block structure 3 is laminated on the leveling layer 5a in the same manner as described above.

At this time, backfill crushed stone 19 having water permeability is filled as a backfill material between the side surface of the foamed resin block structure 3 and the installation surface 23, and furthermore, a kamaba below the crushed stone 19. 24 is also filled with crushed stones 19. In addition, a drainage pipe 25 that communicates between the pot place 24 and the outside through below the foamed resin block structure 3 is embedded, and a drainage groove 17b that receives drainage from an outlet of the drainage pipe 25 is provided. .

As the pressing load 11, a covering layer 11a and a roadbed 11b are placed on the foamed resin block structure 3. In addition, an embankment 26 is provided so as to cover the side surface of the foamed resin block structure 3,
Although not shown, a polyethylene sheet that blocks water is sandwiched between the embankment 26 and the foamed resin block structure 3.

As described above, the ventilation layer 10 is provided in the foamed resin block structure 3 according to the maximum groundwater level 8. An exhaust hole 6b is provided in the embankment 26 in accordance with the ventilation layer 10, and after the holding load 11 during the construction is provided, the drain pipe 25 is closed for a predetermined period, and the foamed resin block is formed by rainfall or the like. Water such as groundwater accumulates in the structure 3 through the crushed stone 19.

As a result, the gas staying in the foamed resin block structure 3 can be discharged to the outside through the exhaust holes 6b in the same manner as described above.
Can reduce the gas concentration at the site, and can avoid the occurrence of fire accidents during construction and the like.

The civil engineering structure using the foamed resin block 1 as described above is usually buried about half or completely buried in the soil in order to utilize the lightness of the foamed resin block 1. Or, it is used for backfilling such as retaining walls, or for self-standing walls, etc. Therefore, to protect the foamed resin block structure 3 from wind, rain, ultraviolet rays, etc., the side surface is covered with the side wall during construction, and the upper surface is a sheet. Etc. are often covered.

Conventionally, in the civil engineering method using a foamed resin block, a drain hole is provided so as not to raise the water level in the foamed resin block structure in order to avoid a problem due to buoyancy caused by water during flooding. Have been.

However, in the foamed resin block structure 3, a foaming agent such as butane and pentane remains in the foamed resin block 1, and the gaseous gas of the foaming agent is heavier than air. It stays in the block structure 3.

Thus, in the conventional civil engineering method, the accumulated gas is not considered, and the gas concentration in the foamed resin block structure becomes high. As a result, the retained gas may catch fire and cause a fire accident.

However, in the construction and the method of construction of each of the above embodiments, a gas insoluble in water can be discharged to the outside by utilizing the fluctuation of the groundwater level, so that the gas concentration in the foamed resin block structure 3 during construction is reduced. It is possible to reduce and prevent a fire accident due to ignition.

In the construction and method of the above embodiment,
Although the example in which the groove 9a is formed as the gas permeable block 9 has been described, the groove 9a is not particularly limited as long as it promotes the movement and diffusion of the stagnated gas. Alternatively, as shown in FIG. 12, for example, as shown in FIG. 12, a ventilation block 9 ′ having gas passages 9′a opened at both longitudinal end faces of a substantially rectangular parallelepiped foamed resin block.
Can also be used.

In such a permeable block 9 ′, the concave portions 9 ′ b are formed at both longitudinal end surfaces of the gas passage 9 ′ a.
Are formed, and the gas passages 9'a of the ventilation blocks 9 '... Adjacent in the longitudinal direction can be easily communicated with each other, and the gas pushed up as the groundwater level rises diffuses in the horizontal direction. It is easy to move.

[0082]

As described above, the civil engineering method for the civil engineering structure having the foamed resin block according to the first aspect of the present invention is as follows.
This is a method in which foamed resin blocks are stacked, and the staying gas in the foamed resin block group is released to the outside using the fluctuation of the groundwater level.

Therefore, the above-described method can reduce the concentration of the gas that has been vaporized by the blowing agent in the civil engineering structure by utilizing the fluctuation of the groundwater level, thereby reducing the occurrence of fire accidents during construction and the like. This has the effect of being able to reduce.

In the civil engineering structure having the foamed resin block according to the second aspect of the present invention, as described above, the block made of the foamed resin is laminated on the construction base surface, and the side wall is formed on the side surface of the block group. In addition, an exhaust hole is provided in the side wall for discharging the staying gas in the block group to the outside due to a change in the groundwater level.

Therefore, the above configuration makes it possible to discharge the gas to the outside through the exhaust holes because the staying gas rises in the block group by utilizing the fluctuation of the groundwater level.
Since the gas concentration in the civil engineering structure can be suppressed, it is possible to reduce the occurrence of fire accidents during construction or the like.

According to the third aspect of the present invention, there is provided a civil engineering structure provided with a foamed resin block according to the third aspect of the present invention, in the civil engineering structure provided with the foamed resin block according to the second aspect, at a position where the exhaust hole is attached. Accordingly, a ventilation layer that promotes gas diffusion and transfer is sandwiched in the block group.

Therefore, in addition to the effect of the second aspect of the present invention, the above configuration has an effect that the gas can be rapidly discharged to the outside from the exhaust hole.

According to a fourth aspect of the present invention, there is provided a civil engineering structure having a foamed resin block according to the third aspect of the present invention, wherein the ventilation layer is formed of a gas passage. Are formed side by side so as to promote diffusion and movement of gas.

Therefore, in addition to the effect of the second aspect of the present invention, the above structure has an effect that the gas can be quickly discharged to the outside from the exhaust hole.

The civil engineering structure provided with the foamed resin block according to the fifth aspect of the present invention, as described above, has a structure having a bottom portion and a side wall placed on a construction base surface, and a block made of a foamed resin. Are stacked in the structure, and a communication hole communicating the inside of the structure with the outside is provided at the bottom,
An exhaust hole is provided on the side wall for discharging the staying gas from the block group to the outside due to a change in the groundwater level.

Therefore, the above configuration makes it possible to discharge the gas to the outside through the exhaust holes because the staying gas rises in the block group by utilizing the fluctuation of the groundwater level.
Since the gas concentration in the civil engineering structure can be suppressed, it is possible to reduce the occurrence of fire accidents during construction or the like.

In the civil engineering structure having the foamed resin block according to the sixth aspect of the present invention, as described above, the block made of the foamed resin is laminated on the inclined construction base surface, and the block group is almost upright. A retaining wall is provided on the side surface, and an exhaust hole for discharging stagnant gas from the block group to the outside due to fluctuations in the groundwater level is provided in the retaining wall, and the gas diffuses and moves through a ventilation block in which a gas passage is formed. A ventilation layer arranged side by side so as to promote the above is sandwiched in the block group at a position corresponding to the exhaust hole.

Therefore, the above configuration makes it possible to discharge the gas to the outside through the exhaust holes, because the accumulated gas rises in the block group by utilizing the fluctuation of the groundwater level.
Further, the gas that has reached the block group at a position corresponding to the exhaust hole is quickly diffused and moved by the ventilation layer, and can be quickly released to the outside.

As a result, the above configuration has an effect that the occurrence of fire accidents during construction or the like can be reduced because the gas concentration in the civil engineering structure can be suppressed.

The civil engineering structure provided with the foamed resin block according to claim 7 of the present invention is, as described above, a structure having a bottom portion and a side wall placed on a dug-down construction base surface and made of foamed resin. Blocks are stacked in the structure, and a communication hole communicating the inside of the structure with the outside is provided at the bottom, and an exhaust hole that discharges stagnant gas from the group of blocks to the outside due to fluctuation of the groundwater level is provided. Provided on the side wall,
A ventilation layer formed by arranging ventilation blocks in which gas passages are formed so as to promote diffusion and movement of gas is sandwiched in the block group at a position corresponding to the exhaust hole.

Therefore, the above configuration makes it possible to discharge the gas to the outside through the exhaust holes because the staying gas rises in the block group by utilizing the fluctuation of the groundwater level.
Further, the gas that has reached the block group at a position corresponding to the exhaust hole is quickly diffused and moved by the ventilation layer, and can be quickly released to the outside.

As a result, the above configuration has an effect that the occurrence of fire accidents during construction or the like can be reduced since the gas concentration in the civil engineering structure can be suppressed.

The civil engineering structure provided with the foamed resin block according to claim 8 of the present invention, as described above, is formed by laminating a block made of foamed resin on a construction base surface in which an installation surface is dug down. A side wall that covers the side surface is provided, and an exhaust hole that discharges the stagnant gas from the block group to the outside due to fluctuations in the groundwater level is provided near the installation surface of the side wall, and the ventilation block in which the gas passage is formed is provided with a gas passage. A ventilation layer arranged side by side so as to promote diffusion movement is sandwiched in the block group at a position corresponding to the exhaust hole.

Therefore, the above configuration makes it possible to discharge the gas to the outside through the exhaust holes because the staying gas rises in the block group by utilizing the fluctuation of the groundwater level.
Further, the gas that has reached the block group at a position corresponding to the exhaust hole is quickly diffused and moved by the ventilation layer, and can be quickly released to the outside.

As a result, the above configuration has an effect that the occurrence of fire accidents during construction or the like can be reduced since the gas concentration in the civil engineering structure can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a civil engineering structure provided with a foamed resin block of the present invention.

FIG. 2 is a perspective view of the foamed resin block.

FIG. 3 is an explanatory view showing a method of laminating the above foamed resin blocks.

FIG. 4 is a plan view of a main part of a foamed resin block structure obtained by laminating the foamed resin blocks.

FIG. 5 is a front view of a main part of the block structure made of foamed resin.

FIG. 6 is a fragmentary cross-sectional view showing a method of leveling a civil engineering structure including the foamed resin block on a construction base surface.

FIG. 7 is a perspective view of a ventilation block used for a ventilation layer in the civil engineering structure.

FIG. 8 is a cross-sectional view of a main part showing another embodiment of the civil engineering structure including the foamed resin block of the present invention.

FIG. 9 is a sectional view of a main part showing still another embodiment of the civil engineering structure provided with the foamed resin block of the present invention.

FIG. 10 is a cross-sectional view of a main part showing still another embodiment of the civil engineering structure including the foamed resin block of the present invention.

FIG. 11 is a cross-sectional view of a main part showing still another embodiment of the civil engineering structure including the foamed resin block of the present invention.

FIG. 12 is a perspective view of a modified example of the ventilation block.

[Explanation of symbols]

 1 foam resin block 3 foam resin block structure (block group)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Imaka Taisei Construction Co., Ltd., 1-25-1 Nishi Shinjuku, Shinjuku-ku, Tokyo Inventor Kenji Sasaki 4-3-17 Kajino-cho, Koganei-shi, Tokyo

Claims (8)

(57) [Claims] 1. A civil engineering structure having a foamed resin block, wherein blocks made of foamed resin are stacked, and a gas retained in the block group is released to the outside by utilizing a change in groundwater level. Construction method. 2. A block made of a foamed resin is laminated on a construction base surface, a side wall is provided on a side surface of the block group, and exhaust gas that discharges a stagnant gas in the block group to the outside due to a change in groundwater level. A civil engineering structure comprising a foamed resin block, wherein a hole is provided in the side wall. 3. A foam resin block according to claim 2, wherein a ventilation layer for promoting gas diffusion and movement is sandwiched in said block group in accordance with a mounting position of said exhaust hole. Civil structure to be equipped. 4. The civil engineering equipment according to claim 3, wherein said ventilation layer is formed by arranging ventilation blocks having gas passages in parallel to promote diffusion and movement of gas. Structure. 5. A structure having a bottom and side walls is placed on a construction base surface, a block made of a foamed resin is laminated in the structure, and the inside and outside of the structure communicate with the bottom. A civil engineering structure provided with a block made of a foamed resin, wherein a communication hole is provided, and an exhaust hole for discharging stagnant gas from the block group to the outside due to a change in groundwater level is provided on the side wall. 6. A block made of a foamed resin is laminated on an inclined construction base surface, a retaining wall is provided on a substantially upright side surface side of the block group, and a stagnant gas from the block group is used to change groundwater level. An exhaust hole to be released to the outside is provided in the retaining wall, and a ventilation layer formed by juxtaposing ventilation blocks having gas passages so as to promote gas diffusion and movement is provided at a position corresponding to the exhaust hole. An civil engineering structure comprising a block made of a foamed resin, which is sandwiched in a block group. 7. A structure having a bottom portion and a side wall is placed on a dug-down construction base surface, a block made of a foamed resin is laminated in the structure, and the inside and outside of the structure are formed on the bottom portion. A communication hole is provided for communicating the gas, and an exhaust hole is provided in the side wall for discharging the stagnant gas from the block group to the outside due to a change in the groundwater level. The gas diffusion passage is formed in the ventilation block in which the gas passage is formed. A civil engineering structure comprising a foamed resin block, wherein a ventilation layer arranged side by side is sandwiched in the block group at a position corresponding to the exhaust hole. 8. A block made of a foamed resin is laminated on a construction base surface in which an installation surface is dug down, a side wall covering a side surface of the block group is provided, and a stagnant gas from the block group is transferred to a groundwater level. An exhaust hole for discharging to the outside is provided in the vicinity of the installation surface of the side wall, and a ventilation layer formed by juxtaposing a ventilation block having a gas passage formed so as to promote diffusion and diffusion of gas corresponds to the exhaust hole. A civil engineering structure including a foamed resin block, which is sandwiched in the block group at a position.