JP2646346B2 - Lightweight embankment and road - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a lightweight embankment used as a measure against a soft ground when a road or the like is constructed on a soft ground or a steep slope, and a road using the structure.

[0002]

2. Description of the Related Art Conventionally, when a building or the like is constructed on soft ground, the ground surface is dug down and filled with a hard foamed plastic to serve as a backfill for backfilling, and a building or the like is constructed thereon. (U.S. Pat. No. 3626)
702).

[0003] In the above-mentioned conventional technique, the rigid foamed plastic block is extremely light in weight compared with the earth and sand removed by digging down, so that the load applied to the supporting surface at the location is reduced, and the supporting force of the supporting surface is reduced. By providing a margin, it is intended to support the load of a building or the like constructed thereabove, and can be said to be a lightweight buried soil.

[0004]

However, in the case of the above-mentioned backfilling with the conventional lightweight buried soil, when the weight of a building or the like built thereon is heavy, the ground is dug down considerably deep to fill the hard foamed plastic block. There is a need to. In particular, digging deeply into soft ground involves a great risk of surrounding ground collapse and the like, and there is a problem that construction requires a lot of labor and cost.

[0005] On the other hand, roads are often constructed by embankment to ensure drainage of the road surface and the like, so that the road surface is higher than the surrounding ground. In particular, when constructing a road in a low-wetland or the like, the embankment is raised to prevent flooding of the road surface. In addition, even on a highway in a hilly area, a road is often constructed by embankment being high in a valley in order to prevent an extreme gradient.

[0006] In the construction of a road with high embankment as described above, since the embankment amount is large, a considerable load is applied on the ground supporting it, and if the ground is soft, it cannot be supported. , Causing sinking. In addition, embankment on steep slopes may cause landslides.

In such a case, if the conventional lightweight buried soil is used and the bearing capacity of the support surface is to be given a margin, the weight of the embankment on the ground surface is considerably large. The plastic blocks must be filled, which requires a lot of work and cost.
Further, simply filling with a hard foamed plastic block causes unstable stacking of the hard foamed plastic block, and there is also a problem that sufficient earthquake resistance cannot be obtained, especially in Japan where there are many earthquakes.

The present invention has been made in view of such a problem of the conventional lightweight embankment, and particularly when embankment is performed on soft ground, the embankment is supported without digging down or shaving the ground surface. An object of the present invention is to make it possible to improve the seismic resistance of such embankment.

[0009]

Means taken by the present invention for this purpose will be described with reference to FIGS. 1 and 2. According to the first aspect of the present invention, a rectangular parallelepiped rigid foamed plastic block 1 is provided.
Light-weight embankments are stacked in multiple layers so that their longitudinal directions are orthogonal to each other and the upper and lower joints are not aligned, and a covering soil 2 is applied thereon.

According to the invention of claim 5, the rectangular parallelepiped rigid foamed plastic blocks 1 are stacked in multiple layers so that their longitudinal directions are orthogonal to each other and the upper and lower joints are not aligned, and the covering soil 2 is applied from above. A pavement 3 is formed on the top of the lightweight embankment.

According to the ninth aspect of the present invention, the rectangular parallelepiped hard foamed plastic blocks 1 are stacked in multiple layers so that the longitudinal directions thereof are orthogonal to each other and the upper and lower joints are not aligned, and the upper surface thereof is coated with a solvent protective layer (not covered). This is a road characterized by forming a pavement 3 on the top of a lightweight embankment on which a covering 2 is applied from above.

According to the present invention, the rigid foamed plastic blocks 1 stacked on the ground surface 4 serve to reduce the weight of the embankment and to reduce the load applied to the support surface, thereby constructing a lightweight embankment on a steep slope. In this case, it acts to reduce the earth pressure applied not only in the vertical direction but also in the horizontal direction. Furthermore, since the rigid foamed plastic blocks 1 are stacked so that the longitudinal directions thereof are orthogonal to each other and the upper and lower joints are not aligned, the stacked state of the rigid foamed plastic blocks in each stage is stabilized.

[0013]

FIG. 1 is a perspective view showing an example of a state in which rigid foamed plastic blocks according to the present invention are stacked.

The rigid foamed plastic block 1 has a rigid foamed plastic block of each stage in which the longitudinal directions are perpendicular to each other,
The hard foamed plastic blocks 1 in the upper stage are stacked so that the seams of the blocks are not aligned. For this reason, a stable stacked state can be obtained, and as a result, a structure with high seismic resistance can be obtained.

Further, in the planar arrangement of the rigid foamed plastic blocks stacked in multiple layers, at least one layer, the joints in the short direction of the rigid foamed plastic block 1 are staggered as in the lower three layers in FIG. It is preferred that Thus, when attaching a connecting member (see FIG. 4) described later straddling the upper, lower, left, and right sides between the blocks, integration of the whole is further promoted, and a further earthquake-resistant structure is obtained.

[0016] The lightweight embankment of the present invention is constructed by covering the hard foamed plastics 1 stacked in the above-described state with soil.

The material of the hard foamed plastic block 1 includes, for example, polystyrene, polyurethane, polyvinyl chloride and the like. Polystyrene is particularly preferable in consideration of strength and weight.

The hard foamed plastic block 1 is not only a one-piece block, but is also formed by stacking a plurality of foamed plates formed by extrusion foaming or bead foaming and bonding them with an adhesive or fastening with a belt. It may be something. However, when fastening with a belt, it is preferable to use a belt made of a material which is hardly corroded, for example, polypropylene, nylon, polyethylene or the like.

Further, according to the bead foaming, it is possible to obtain a thick, solid, lump-shaped hard foamed plastic block 1, and it is possible to omit the work of integrating by bonding with an adhesive or fastening with a belt as described above, which is preferable. .

The size of the hard foamed plastic block 1 may be determined in consideration of workability, difficulty of collapse after stacking, and the like. As an example, a width of 1000 mm and a length of 200
One having a size of 0 mm and a thickness of 500 mm is exemplified.

By forming the rigid foamed plastic block 1 as a bead foam molded product, stacking the same, and stacking a foam plate molded by extrusion foaming, the bead foam molded product and the extruded foam molded product can be used in combination. .
In general, an extruded foam molded article is superior in compression resistance and bending resistance to a bead foam molded article. When this extruded foam molded article is used as the upper layer of the stacked rigid foamed plastic blocks 1, the extruded foam molded article supports the load of the vehicle or the like applied to the upper surface of the lightweight embankment to be constructed. The stress generated in the product can be reduced.

FIG. 2 is a longitudinal sectional view showing an example of a road using the lightweight embankment structure of the present invention.

In the figure, reference numeral 4 denotes a ground surface. The ground surface 4 is dug down, and the rigid foamed plastic blocks 1 are stacked at a height exceeding the ground surface 4 from the ground. A covering 2 is applied on the rigid foamed plastics 1 stacked at a height exceeding the ground surface 4 to constitute a lightweight embankment.

The covering 2 is used to obtain a predetermined embankment using the lightweight hard foamed plastic block 1 as a core material, and protects the stacked hard foamed plastic blocks 1. That is, the road according to the present invention is formed by forming the pavement 3 on the top of the lightweight embankment on which the covering 2 is applied. It can function as a protective layer that prevents the block 1 from biting.

In the road of the present invention having the above structure, in order to protect the rigid foamed plastic blocks 1 from a solvent such as gasoline, the stacked rigid foamed plastic blocks 1 are coated with a solvent protection layer such as a sheet of polyethylene or polypropylene or a concrete floor slab. It is preferable to cover with.

On both sides of the hard foamed plastic block 1 stacked on the ground surface 4, since both sides of the embankment are usually inclined surfaces, the inclined surfaces can be easily formed, and the soil covering the inclined surfaces can be easily formed. In order to reduce the weight of 2, it is preferable to make it stepwise. In particular, when forming a gentle slope, it is relatively thin (50 to 100).
mm) may be stacked stepwise.

Further, as shown in the figure, if the parts to be piled up in the ground are stacked in a substantially inverted trapezoidal shape as a whole, and the central part, which is susceptible to a large load, is mainly reduced in weight, the rigid foam plastic used The amount of block 1 can be saved.

In the embodiment shown in the figure, the ground surface 4 is dug down and the rigid foamed plastic blocks 1 are stacked from underground. However, if the ground has a certain supporting force, the ground surface 4 may be dug down. Omitting this, the rigid foam plastic block can be stacked directly on the ground surface 4.

In the present invention, as shown in FIG. 3, the rigid foamed plastic blocks 1 to be stacked can be connected to each other by a connecting tool 5 in order to obtain a more stable and strong stacked state.

As shown in FIG. 4, the connecting member 5 is formed by making a diagonal cut in the peripheral edge of the metal plate and folding the portion into teeth 6a and 6b. The teeth 6a and 6b have tips at the tips. It forms an acute right-angled triangle and protrudes up and down. The downwardly protruding teeth 6b pierce the upper surface of the rigid foamed plastic block 1 and protrude upward.
Are pierced into the lower surface of the rigid foamed plastic block 1 superposed thereon.

As shown in FIG. 3, the connecting member 5 is located straddling between the hard foamed plastic blocks 1 adjacent to each other in the plane, and the downward 6b is connected to the two hard foamed plastic blocks 1 adjacent to each other. Piercing each of the. Accordingly, the connecting tool 5 connects the upper and lower hard foamed plastic blocks 1 and also connects the hard foamed plastic blocks 1 adjacent to each other in the plane.

When the connecting member 5 is attached across the hard foamed plastic blocks 1 adjacent to each other on the plane as described above, the hard foamed plastic blocks 1 can be connected not only in the vertical direction but also in the horizontal direction, and are stacked. The hard foamed plastic block 1 is less likely to collapse.

When the connecting members 5 are attached between the rigid foamed plastic blocks 1 adjacent to each other on the plane and the rigid foamed plastic blocks 1 are connected not only in the vertical direction but also in the horizontal direction, the connecting members 5 are at least two downwards. It is necessary to have one tooth 6b and at least one upward tooth 6a. That is, a downward tooth 6b for piercing the two rigid foamed plastic blocks 1 adjacent to each other in a plane and an upward tooth 6a for piercing the rigid foamed plastic block 1 to be superimposed are required. However, a plurality of teeth 6b may be used as the upward teeth 6a.

As shown in FIG. 4, at least the downwardly directed teeth 6b are located between the central portions where the teeth 6b are not formed.
It is preferable that they are formed separately on the left and right. By doing so, the connecting tool 5 is attached so that the central portion where the teeth 6b are not formed is near the seam between the hard foamed plastic blocks 1 that are adjacent to each other in the plane, so that the teeth 6b
Can be prevented from piercing the end of the rigid foamed plastic block 1 and the end of the rigid foamed plastic block 1 is easily broken. When there are a plurality of upward teeth 6a, it is preferable to provide the upward teeth 6a separately on the left and right as described above.

As shown in FIG. 4, it is preferable that the upward teeth 6a and the downward teeth 6b in the case of a plurality of teeth coexist both in the front-rear direction and in the left-right direction. When the teeth 6a, 6b are all aligned in the same direction, when a force in that direction acts on the hard foamed plastic block 1, the hard foamed plastic block 1 is easily torn along the teeth 6a, 6b.

When the connecting tool 5 is used, the rigid foamed plastic blocks 1 adjacent to each other on the plane are firmly butted against each other, and then the teeth 6b are inserted between them. At this time, even if the teeth 6b are not completely inserted, the teeth 6b can be sufficiently inserted together with the insertion of the teeth 6a when the hard foamed plastic block 1 is overlaid and pressed thereon.

[0037]

The present invention is as described above, and has the following effects.

In the lightweight embankment of the present invention, since the weight of the embankment is greatly reduced by the stacked rigid foamed plastic blocks 1, even when a high embankment is constructed on soft ground, it is possible to prevent settlement and landslide. it can. Also,
Since the rigid foamed plastic blocks 1 are stacked so that the longitudinal directions are orthogonal to each other, and the rigid foamed plastic blocks 1 are stacked so that the seams between the rigid foamed plastic blocks 1 are not aligned vertically,
The stacking condition is stable, and a structure with excellent earthquake resistance is obtained. Further, when a molded product of bead expanded polystyrene is used as the hard foamed plastic block 1, an extremely lightweight and highly reliable embankment structure can be obtained.

In the road of the present invention, in addition to the effect of the lightweight embankment of the present invention, the cover 2 covering the hard foamed plastic block 1 prevents the gravel of the pavement 3 from digging into the hard foamed plastic block 1. Function as a protective layer, and become a highly reliable road.

Further, the rigid foamed plastic block 1
Is protected by a sheet of polyethylene or polypropylene, the hard foamed plastic block 1 can be protected from solvents such as gasoline,
The road will be more reliable.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a state in which rigid foamed plastic blocks according to the present invention are stacked.

FIG. 2 is a longitudinal sectional view showing an example of the road of the present invention using the structure of the lightweight embankment of the present invention.

FIG. 3 is a perspective view showing a connection state of a rigid foamed plastic block by a connection tool.

FIG. 4 is a perspective view of a connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard foamed plastic block 2 Covering soil 3 Pavement 4 Ground surface 5 Connecting tool 6a, 6b Teeth

Claims (12)

(57) [Claims] 1. A lightweight embankment in which rectangular parallelepiped hard foamed plastic blocks are stacked in multiple layers so that their longitudinal directions are orthogonal to each other and the upper and lower joints are not aligned, and the soil is applied from above. . 2. The lightweight embankment according to claim 1, wherein in the planar arrangement of the hard foamed plastic blocks, joints in the short direction of the hard foamed plastic blocks are arranged in a staggered manner in at least one layer. 3. The lightweight embankment according to claim 1, wherein the hard foamed plastic block is bead expanded polystyrene. 4. The lightweight embankment according to claim 1, wherein the rigid foamed plastic block is formed by integrating a plurality of extruded foamed polystyrene plates with an adhesive. 5. A hard foamed plastic block having a rectangular parallelepiped shape is stacked in multiple layers so that the longitudinal directions thereof are orthogonal to each other and the upper and lower joints are not aligned, and a pavement is provided on the top of the lightweight embankment on which soil is applied from above. A road characterized by forming a body. 6. The road according to claim 5, wherein in the planar arrangement of the rigid foamed plastic blocks, the joints in the short direction of the rigid foamed plastic blocks are arranged in a zigzag pattern in at least one layer. 7. The road according to claim 5, wherein the rigid foam plastic block is bead expanded polystyrene. 8. The road according to claim 5, wherein the rigid foamed plastic block is formed by integrating a plurality of extruded foamed polystyrene plates with an adhesive. 9. A rectangular parallelepiped hard foamed plastic block is stacked in multiple layers so that its longitudinal directions are orthogonal to each other and the upper and lower joints are not aligned, the upper surface is covered with a solvent protective layer, and the soil is further applied from above. A road characterized by forming a pavement on the top of the lightweight embankment. 10. The road according to claim 9, wherein in the plane arrangement of the hard foamed plastic blocks, the joints in the short direction of the hard foamed plastic blocks are arranged in a staggered manner in at least one layer. 11. The road according to claim 9, wherein the rigid foamed plastic block is bead expanded polystyrene. 12. The road according to claim 9, wherein the hard foamed plastic block is formed by integrating a plurality of extruded foamed polystyrene plates with an adhesive.