JP4384321B2 - Lightweight embankment structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-weight embankment structure using a combination of in-situ foaming of hard foamed urethane and a block of hard foamed synthetic resin on an inclined land.
[0002]
[Prior art]
In recent years, polystyrene foam blocks have been used as lightweight embankment materials such as embankments on soft ground, steep slopes, and backfilling of structures.
In particular, in sloping land, when embankment is formed using earth and sand or crushed stone, there is a problem that large earth pressure is generated in the horizontal direction because the embedding is not integral, so use a lightweight block as described above, These are integrated using a connecting metal fitting so as not to generate a large horizontal pressure. However, in order to lay blocks such as expanded polystyrene on sloping ground, it is necessary to level the bottom of the sloping ground, and in addition to the ground leveling work itself, it is necessary to load a construction machine such as a bull tozer for leveling. It is often difficult to do, especially in mountainous areas. On the other hand, in recent years, in such a mountainous area, lightweight embankment using hard foamed urethane that foams a hard foamed urethane stock solution that requires almost no leveling work on site has come to be used.
However, in the embankment with rigid foamed urethane, there is a problem that the amount of embankment that can be formed in one day with an exothermic reaction during the foaming process is limited, and the construction period becomes long.
[0003]
[Problems to be solved by the invention]
By the way, in Japanese Patent Laid-Open No. 5-148888, there is a reduction in the step of carrying in the earth and sand for filling by filling the space between the ground and the block of the hard synthetic resin foam with hard foamed polyurethane. Are listed. However, leveling work for laying blocks is also necessary for embankment work on slopes.
The present invention provides a lightweight embankment structure in which the leveling work is reduced and the construction period can be shortened in the embankment of an inclined land.
[0004]
[Means for solving problems]
The lightweight embankment structure of the present invention is a lightweight embankment structure in which a foamed synthetic resin material is filled between a retaining wall and an inclined land, and foamed hard foamed urethane is formed on the bottom of the sloped land. A leveling layer is formed, blocks of hard foamed synthetic resin are placed on the leveling layer, and blocks of hard foamed synthetic resin are stacked, and drainage is made so that the leveling layer leads from the slope to the outside of the retaining wall. It is characterized in that a drainage means is provided by embedding a pipe .
[0005]
In the present invention, the foamed urethane foam can be formed by using a foaming apparatus used for on-site heat insulation work such as a house. In the foaming apparatus, a polyol component and a polyisocyanate component filled in a drum can or the like are respectively pumped by a pump through a long hose, and both are mixed and discharged at a discharge port to form hard foamed urethane.
[0006]
First, such a foaming device is installed in a place where the drum can and the foaming device can be easily disposed, and discharged from the discharge port at the tip of a long hose to form foamed hard foamed urethane. At the time of foaming, the ground is made uneven and the hard foamed urethane is foamed in the recesses, so that the formed upper surface is made horizontal and flat to some extent.
[0007]
The hard foamed urethane between the slope and the retaining wall is foamed until an area sufficient to place the hard foam synthetic resin block on the upper surface can be secured. This area is appropriately selected depending on the scale of the embankment.
[0008]
Next, a leveling layer for placing a block of hard foamed synthetic resin on the upper surface of the hard foamed urethane is formed. The leveling layer is formed by spraying and curing a non-foaming synthetic resin or laying earth or sand or crushed stone or the like in order to form the upper surface horizontally and flatly. As the leveling layer, earth and sand and crushed stone are preferable depending on the price and workability.
In addition, if drainage pipes are buried in the leveling layer from the slope to the outside of the retaining wall, or if drainage material is laid on the upper or lower surface of the leveling layer, groundwater can be drained and placed and stacked on the leveling layer. Buoyancy acting on the hard foam synthetic resin block can be suppressed. In addition, as a drainage material, sheets, such as a nonwoven fabric, can be used.
In addition, if the leveling layer is formed of earth and sand or crushed stone, these also serve as drainage materials, and groundwater can be drained simply by burying drainage pipes only in the retaining walls.
[0009]
And the lightweight embankment structure of this invention is constructed | assembled by accumulating the block of a hard foam synthetic resin on a leveling layer by the method similar to the past.
The hard foam synthetic resin block is preferably made of foamed polystyrene for reasons such as price and physical properties.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The lightweight embankment structure of the present invention will be specifically described below with reference to the drawings.
FIG. 1 shows an embodiment of a lightweight embankment structure 1 of the present invention. As an example of a construction method of this lightweight embankment structure 1, first, a retaining wall 10 is constructed on an inclined land, and drain pipes 6 and 6 'for draining groundwater are buried in the retaining wall. Next, the drainage material 2 for allowing the groundwater to permeate through the drainage pipes 6 and 6 ′ is laid on the slope 5 (including the bottom 4). Next, the hard foamed urethane is foamed to an appropriate height on the bottom portion 4 of the inclined ground using a foaming apparatus of hard foamed urethane. Next, the leveling layer 5 is formed using earth and sand or crushed stone in order to mount the block of expanded polystyrene. Thus, when earth and sand or crushed stone is used as the leveling layer, groundwater can be drained through the drainage pipe 6 'without adding drainage means.
Then, by placing foamed polystyrene blocks on the leveling layer in the same manner as before, and further stacking the foamed polystyrene blocks while filling with earth and sand or hard foamed synthetic resin as the interlining material 5 ′ The lightweight embankment structure of the present invention is constructed.
[0011]
【The invention's effect】
As described above, according to the lightweight embankment structure of the present invention, the bottom of the sloped land is formed by the hard foam urethane having excellent workability, so that the leveling work requiring labor is reduced, and the hard foam synthetic resin. The construction period is shortened because the upper part of the embankment is formed with this block.
In addition, by forming a leveling layer on the hard foamed urethane, it is possible to stack the foamed polystyrene blocks so as to be integrated without any deviation, and if the leveling layer has a drainage function, it acts on the foamed polystyrene blocks. Can reduce buoyancy.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a lightweight embankment structure according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lightweight embankment structure 2 Drainage material 3 Hard foaming urethane 4 Bottom part of slope 5 Leveling layer 5 'Filling material 6 Drainage pipe 6' Drainage pipe 7 Concrete board 8 Polystyrene block 10 Retaining wall 11 Slope

Claims (1)

Lightweight embankment structure in which foamed synthetic resin material is filled between the retaining wall and the sloped land. Hard foamed urethane is foamed at the bottom of the sloped land, and a leveling layer is formed on the hard foamed urethane. Drainage made by placing blocks of hard foamed synthetic resin on top of each other, and further stacking blocks of hard foamed synthetic resin, and burying drainage pipes in the leveling layer so as to connect from the slope to the outside of the retaining wall A lightweight embankment structure characterized in that means are provided .

Images