JP4148824B2 - Lightweight embankment construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightweight banking method using a foamed polystyrene block and a rigid polyurethane foam in combination as a lightweight banking.
[0002]
[Prior art]
As one embankment method on soft ground or landslide land, for example, a lightweight embankment method is known in which expanded polystyrene blocks are stacked in multiple stages as a lightweight embankment material. This construction method exhibits an excellent effect in reducing the cost for ground improvement and shortening the construction period.
[0003]
As another embankment method, a lightweight embankment method is known in which rigid polyurethane foam is foam-filled as a light embankment material. This construction method can be applied regardless of the shape of the soft ground or landslide area, and also has excellent adhesion to the ground, ground, and wall body, ensuring safety enough to prevent sliding of lightweight embankments. It can be done.
[0004]
[Problems to be solved by the invention]
However, the lightweight embankment method that stacks the expanded polystyrene blocks in multiple stages, for example, when the earthquake occurs, the expanded polystyrene blocks may be peeled off from the ground or the ground, that is, sliding or falling may occur. There is a problem that it is difficult to ensure. In addition, the lightweight embankment method in which the rigid polyurethane foam is foam-filled has a problem that the material cost of the rigid polyurethane foam itself is high and the construction cost increases.
Thus, in order to ensure the required safety and reduce the construction cost, a combination of a foamed polystyrene block and a rigid polyurethane foam has been proposed. However, when the expanded polystyrene block and the rigid polyurethane foam are used in combination, there is a problem that the reaction heat generated when the rigid polyurethane foam is foam-filled is stored in the foam, and the expanded polystyrene block is deformed by the heat.
[0005]
This invention has been made in view of the problems of the prior art. When a foamed polystyrene block and a rigid polyurethane foam are used in combination, the above-mentioned problems can be solved and the required safety can be ensured. The construction method of the lightweight embankment which can be reduced is provided.
[0006]
[Patent Literature]
Japanese Patent Laid-Open No. 5-148839
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, the lightweight embankment construction method according to claim 1 of the present invention is a method of constructing a lightweight embankment between a wall body and a natural ground or an opposing wall body. After installing the expanded polystyrene block, the polyurethane foam block is sprayed with a rigid polyurethane foam in a linear or dotted manner, and a partition member is adhered to the sprayed rigid polyurethane foam to form a space. A lightweight embankment construction method characterized in that a rigid polyurethane foam is foam-filled between a ground and a ground or a wall. According to this lightweight embankment construction method, since the partition member and the space are provided between the expanded polystyrene block and the rigid polyurethane foam, the rigid polyurethane foam is foam-filled between the partition member and the ground or wall. The reaction heat generated at that time can be hardly transmitted to the expanded polystyrene block, and deformation of the expanded polystyrene block can be prevented. Furthermore, since the adhesiveness with respect to a wall body, a natural ground, and the ground is excellent, while ensuring required safety | security, construction cost can be reduced.
[0008]
A space in the construction method of a lightweight fill of the present invention, spraying the rigid polyurethane foam into a linear or point-like in the installed expanded polystyrene blocks, which was formed by adhering the partition member in its blown rigid polyurethane foams In addition, since the expanded polystyrene block and the partition member are integrated, safety as a lighter weight embankment can be secured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment of the construction method of the lightweight embankment of this invention is described in detail based on drawing. 1 to 6 are related to an embodiment of a lightweight embankment construction method according to the present invention, FIG. 1 is an explanatory view showing a state in which a wall body 10 is erected, and FIG. 2 is an expanded polystyrene block. 3 is an explanatory view showing a method of forming the space 50, FIG. 4 is an explanatory view showing a state of forming the space 50 and installing the partition member 40, and FIG. FIG. 6 is an explanatory view showing a state in which the rigid polyurethane foam 20 is foam-filled between the partition member 40 and the natural ground 11, and FIG. 6 is an explanatory view showing the state of the final process.
[0010]
For example, when the road is widened on the valley side of a natural mountain, as shown in FIG. 1, the lightweight embankment construction method of the present invention constructs a slope (inclined surface) of the natural mountain 11 and the subsequent lightweight embankment. The foundation 10 is excavated, and the wall body 10 that forms the wall surface of the lightweight embankment is erected in accordance with the width of the road to be widened.
[0011]
The wall of the present invention is constructed at a height required for the road to be widened. For example, a steel material such as H-shaped steel, C-shaped steel, or L-shaped steel is used as a support, and a PC board or a lightweight extrusion is used as a wall material outside these supports. It is constructed by attaching a molded cement board or the like, and is a simple and lightweight wall body as compared with a large foundation for a conventional heavy structure and a strong wall body standing on the foundation.
[0012]
Next, as shown in FIG. 2, the expanded polystyrene block 30 is installed on the wall 10 side, and then, as shown in FIG. 3, the rigid polyurethane foam is linearly or dotted or linearly formed on the expanded polystyrene block 30. A space 50 is formed by spraying in combination with the dotted shape, and attaching the partition member 40 to the sprayed hard polyurethane foam 21. Next, the rigid polyurethane foam 20 is foam-filled between the partition member 40 and the ground 11. And the same process is repeated on this, and finally the lightweight embankment of predetermined height is formed as shown in FIG.
[0013]
The expanded polystyrene block of the present invention is placed near one of the wall body side and the natural ground side, or is installed at substantially the center. The amount of the expanded polystyrene block to be installed may be larger than the amount of foaming and filling the rigid polyurethane foam as long as the safety as the lightweight embankment of the present invention can be ensured. In addition, the expanded polystyrene block is piled up at a predetermined position by a single block or two or more blocks. When the blocks are stacked, the side surfaces of the blocks are usually in contact with each other in order to improve the adhesion. For example, it is raining during the stacking, and the foamed polystyrene in which the water from the rain is stacked When the block has entered the block, the block installed at a predetermined position may be displaced. Therefore, the block may be stacked while providing a gap for drainage between the side surfaces of the block.
[0014]
In the space of the present invention, the rigid polyurethane foam is foam-filled between the partition member and the ground or the wall body, and the reaction heat generated at that time is dissipated by the convection effect or the chimney effect, thereby deforming the expanded polystyrene block. Any one having an interval that can be prevented may be used.
[0015]
As a method for forming the space of the present invention, for example, as shown in FIG. 3, after the foamed polystyrene block 30 is installed, a hard polyurethane foam is sprayed linearly on the foamed polystyrene block 30, and the hard polyurethane foam that has been sprayed is partitioned. It is formed by sticking the member 40. Here, the amount sprayed in the form of a line or dots, or a combination of lines and dots may be an amount that does not deform the expanded polystyrene block.
[0016]
Although it does not specifically limit as a width | variety of the space 50a of this invention, Usually, it is 10-500 mm, Preferably it is 20-100 mm. When the width of the space 50a is 10 mm or less, the reaction heat of the rigid polyurethane foam 20 filled between the partition member and the ground (or wall) is easily transferred to the expanded polystyrene block, and the expanded polystyrene block is deformed. May end up. Further, if the width of the space 50a is larger than 500 mm, it is difficult to ensure safety as a lightweight embankment. If the hard polyurethane foam is filled in the space 50 with foam, the reaction heat of the foam filled hard polyurethane foam itself is obtained. May cause deformation or collapse of the expanded polystyrene block.
[0017]
As the partition member of the present invention, for example, a member that can withstand the reaction heat of rigid polyurethane foam is preferable, for example, a plastic board such as a foamed urethane board or a foamed phenol board, or a board made of a synthetic wood board or an inorganic material. The foamed urethane board is particularly excellent in heat resistance and light weight.
[0018]
In addition, the partition member of the present invention may be the above-mentioned plastic board alone, or a plastic board using a face material on at least one of the surfaces in contact with the hard polyurethane foam as a lightweight embankment. As the face material, a material that is not easily adversely affected by water penetrating into the lightweight embankment, that is, a material having excellent water resistance, for example, a metal face material, a plastic face material, a surface using glass fiber or a nonwoven fabric is preferable. A material is preferred.
[0019]
Further, the height of the partition member 40 is set so as to correspond to the foam filling thickness of 0.5 to 1.5 m of the hard polyurethane foam foamed in situ, and the thickness of the foam layer of 0.5 to 1.5 m The height is equal to or higher than that, and preferably has a sufficient height so as not to get over even if it expands due to foaming after on-site blowing. For example, the height is preferably 1.0 to 1.5 times the foam thickness.
[0020]
The amount of the rigid polyurethane foam that is foam-filled between the partition member of the present invention and the ground or wall is once foamed and molded in layers with a thickness of about 30 to 500 mm. 5 to 1.5 m is formed.
[0021]
The rigid polyurethane foam of the present invention may be any as long as it has adhesiveness to the expanded polystyrene block and can be expanded and cured with an isocyanate compound. For example, as a polyol component, a catalyst, a viscosity reducing agent, a flame retardant, a foaming agent and the like are blended in advance with a polyol, and this and a polyisocyanate component are mixed and foamed and cured, and the density thereof is 30 to 50 kg / m. ^3. The compressive strength at 1% strain according to JIS-K7220 is about 5 N / cm ² or more.
[0022]
The polyol used in the present invention includes an ester type and an ether type, and a polyether polyol is preferably used from the viewpoint of durability, particularly hydrolysis resistance. In addition, it may be phenolic.
Although it does not restrict | limit especially as a polyisocyanate component, Generally organic diisocyanate, such as crude MDI, is used.
Although it does not restrict | limit especially as a foaming agent, At least 1 sort (s) chosen from HFC type foaming agents, such as water, a carbon dioxide gas, HFC-245fa, and HFC-365mfc, can be used. These foaming agents may be mixed in the polyol component, or may be mixed and used as the third component.
[0023]
In this way, a lightweight embankment was completed with rigid polyurethane foam, foamed polystyrene blocks, partition members, etc. corresponding to a height of 0.5 to 1.5 m, which was omitted in the figure, but the same process was repeated on this, and finally the figure As shown in FIG. 4, a lightweight embankment having a predetermined height is formed. After that, concrete floor slabs, roadbeds, surface layers, etc. with welded reinforcing bars are formed to complete the widening of the road.
[0024]
Moreover, although the said embodiment demonstrated in the case where only one of the lightweight embankments was comprised with a wall body, this construction method can be similarly applied also when not only this but a wall body. .
[0025]
Moreover, in the said embodiment, after performing foundation work, it demonstrated in the case of constructing lightweight embankment, but it is not restricted to this, For example, on a ground between a wall body and a natural ground or an opposing wall body, for example, synthetic Laying drainage sheets made of resin fibers in a regular shape, laying tubular materials such as non-woven fabrics, perforated hoses and pipes, gravel, etc., or a combination of these, or partitioning The tubular body as described above may be installed in advance only at a predetermined place where the rigid polyurethane foam and the partition member to be foam-filled are installed between the member and the ground or the wall. In this case, the rigid polyurethane foam is foam-filled, and the reaction heat generated at that time can be transmitted through the tubular body by the chimney effect and dissipated from the space of the present invention, that is, the reaction from the tubular body to the space. Heat can be transferred and the heat of reaction can be dissipated from the space by the air sucked into the space, making it easier to prevent deformation of the expanded polystyrene block.
[0026]
Moreover, in the said embodiment, although the hard polyurethane foam was foam-filled between a partition member and a natural ground or a wall body, or between a foamed polystyrene block and a partition member, it is not restricted to this, For example, a foamed polystyrene block Is installed on the natural ground side, the foamed polystyrene block and the foam are expanded when the hard polyurethane foam is foam-filled in the gap formed between the expanded polystyrene block and the natural ground or when the expanded polystyrene blocks are stacked (installed) in multiple stages. Rigid polyurethane foam may be sprayed between the polystyrene blocks to improve adhesion.
[0027]
【The invention's effect】
As described above, according to the construction method of the lightweight embankment of the present invention, the rigid polyurethane foam is foam-filled between the partition member and the ground or the wall, and the reaction heat generated at that time is hardly transmitted to the expanded polystyrene block. The deformation of the expanded polystyrene block can be prevented. Furthermore, since the adhesion to the wall, the ground, and the ground is excellent, the required safety can be ensured and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a state in which a wall body is erected. FIG. 2 is an explanatory view showing a state in which an expanded polystyrene block is installed. FIG. 3 is an explanatory view showing a method for forming a space 50. FIG. FIG. 5 is an explanatory view showing a state in which a hard polyurethane foam 20 is foam-filled. FIG. 6 is an explanatory view showing a state of a final process. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Wall body 11 Ground 12 Basic concrete 20, 21 Hard polyurethane foam 30 Expanded polystyrene block 40 Partition member 50 Space

Claims (1)

A method of constructing a lightweight embankment between a wall body and a natural ground, or an opposing wall body, and after installing a foamed polystyrene block, a rigid polyurethane foam is linear or dotted in the installed foamed polystyrene block A lightweight embankment characterized in that a partition member is attached to the sprayed rigid polyurethane foam to form a space, and the rigid polyurethane foam is foam-filled between the partition member and the ground or wall. Method.

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