JP2000230235A - Lightweight banking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight banking method capable of efficiently banking with sufficient strength without accumulating water on the surface of a foam layer even at the time of a rainfall or a snow fall during the construction period. SOLUTION: A foam resin raw material P is discharged, foamed and hardened on the ground 11 to form a first foam layer 21, and a drain groove section 22 is formed on the surface of the foam layer 21 when the foam layer 21 is formed. The foam resin raw material P is filled in the drain groove section 22 on the surface of the already formed foam layer 21, and the foam resin raw material P is discharged, foamed and hardened on the already formed foam layer 21 to form a new foam layer 21 and a new drain groove section 22. These laminating processes are repeated prescribed times to integrally laminate a plurality of foam layers 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lightweight embankment method.

[0002]

2. Description of the Related Art Conventionally, when widening a pavement road or constructing a pavement road on a steep slope, embankment for laying soil or gravel on the ground has been performed. However, the embankment method using sand and gravel requires large-scale equipment and machinery during construction, which places an excessive burden on the constructor during construction and transport of raw materials, and has the problem of heavy materials. was there.

Recently, in order to simplify the work and reduce the weight of the material, as shown in FIG. 8, a hard foam layer 70 made of hard urethane foam or the like is used instead of soil or gravel on the ground 61. A lightweight embankment method has been proposed which is formed thereon and raised by the hard foam layer 70. FIG.
In the figure, the structure of the pavement road 60 on a steep slope is shown. In the figure, reference numeral 62 denotes a slope, 63 denotes a base plane for leveling the upper surface of the ground 61, and 64 denotes an upper surface of the hard foam layer 70. A concrete floor slab, 64a is an anchor portion of the concrete floor slab 64, 65 is a subgrade such as soil laid on the concrete floor slab 64, 66 is a subgrade such as gravel forming a pavement layer, and 67 is an asphalt or the like. The surface layer, C, is a car passing on a paved road.

[0004] In the lightweight embankment method, as shown in FIG.
A wall surface 68 is arranged on the upper surface of the ground 61, in the case of the drawing, on the upper surface of the base plane 63, and a space partitioned by the wall surface 68 as shown in FIG. The discharge and foam hardening of P are repeated a plurality of times, and a plurality of hard foam layers 71 are sequentially laminated and integrated on the ground 61 to form a hard foam layer 70 composed of a plurality of layers.

[0005] By the way, in the lightweight embankment method,
If rain or snow falls during the construction period, water may accumulate on the surface of the foam layer 71 formed at that time. When a new foam layer is formed on the foam layer while the water remains on the foam layer surface,
Water intervenes at the boundary between the foam layer whose surface is wet and the foam layer laminated thereon, so that the density distribution at the boundary becomes discontinuous, and the entire embankment comprising a plurality of layers (hard foam layer) The strength as the whole 70) may be deteriorated.

Therefore, conventionally, as a countermeasure against the above-mentioned rainfall and snowfall, the entire construction site is covered with a tent or the like, and as shown in FIG. To prevent the surface of the foam layer 71 from getting wet.

However, in the former case where the entire construction site is covered with a tent or the like, for example, when the construction site for forming a hard foam layer is extremely large, the entire construction site is actually covered with a tent depending on the situation of the construction site. In many cases, the tent cannot be assembled, and it takes time and effort to assemble and remove the tent.

When the surface of the foam layer is covered with a plurality of sheets, water accumulated on the sheet leaks from the seam of each adjacent sheet to the foam layer below the sheet, When water is removed, rainwater or the like accumulated on the sheet often leaks to the foam layer side.
In the case where water leaks to the foam layer side and water accumulates on the foam layer surface, complicated work such as wiping off the water with a mop or sucking it with a suction device or the like is necessary. In addition, the efficiency of the entire construction work is low, and the construction period is delayed.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and water does not accumulate on the surface of a foam layer even when rain or snow falls during the construction period. An object of the present invention is to provide a lightweight embankment method capable of performing embankment construction with sufficient strength and efficiency.

[0010]

According to a first aspect of the present invention, a plurality of foamed layers are sequentially laminated and integrated by repeatedly discharging and foaming and curing a foamed resin material on the ground in a plurality of times. In the lightweight embankment method, by discharging and foaming and hardening the foamed resin material on the ground, the first foamed layer is formed, and when the foamed layer is formed, a drainage groove is formed on the foamed layer surface. After that, the foamed resin material is filled in the drainage grooves on the surface of the already formed foam layer, and the foamed resin material is discharged and foamed and hardened on the already formed foam layer, thereby forming a new foam layer and a new foam layer. The present invention relates to a lightweight embankment method, wherein a plurality of foamed layers are laminated and integrated by repeating a laminating step of forming a proper drainage groove portion a predetermined number of times.

According to a second aspect of the present invention, in the first aspect, when forming each of the foam layers, a gradient is formed on the surface of the foam layer so that the surface of the foam layer becomes lower toward the drain groove. The present invention relates to a lightweight embankment method.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an embodiment of a lightweight embankment method according to the present invention when a wall is erected, FIG. 2 is a cross-sectional view showing the formation of a hard foam layer in a stepwise manner, and FIG. FIG. 4 is a partial perspective view showing the completion of the formation of the first foam layer in the formation of the rigid foam layer, and FIG. 5 is a partial perspective view showing the completion of the formation of the first foam layer in the same manner. , FIG. 6 is a cross-sectional view showing the formation of the first foam layer in another embodiment, and FIG. 7 is a view showing the completion of the formation of the first foam layer in another embodiment. It is a partial perspective view.

One embodiment of the lightweight embankment method according to the present invention will be described with reference to FIGS. 1 to 4 by taking as an example the construction of a paved road S on a steep slope shown in FIG.

In the construction of the pavement road S shown in FIG. 5, the ground 11 and the slope 12 are first excavated in order to smoothly and efficiently carry out each of the operations to be described later. In addition to the foundation work for forming the base 13, the upper surface of the ground 11,
A waterproof primer is applied (sprayed) on the upper surface and the slope 12 and left for a predetermined time. The application of the waterproof primer imparts waterproofness to the ground 11 or the slope 12 and enhances adhesion to each foam layer described later.

Next, as shown in FIG. 1, a wall 15 is erected on the ground 11 at a predetermined distance from the slope 12 so as to face the slope 12. The wall surface 15 is for preventing the discharged foamed resin raw material from flowing and spreading over a predetermined range in the horizontal direction of the ground, that is, for partitioning a space where a foamed layer is to be formed, and a plurality of the wall surfaces 15 are provided upright at predetermined intervals. H
It is composed of a pillar 16 made of steel or the like, and a space between the adjacent pillars 16 covered with a frame member 17 made of a steel plate, a concrete panel, or the like.

After the wall 15 is erected, as shown in FIG. 2, the foaming resin material P is discharged and foamed and hardened into a space defined by the wall 15 on the ground 11 (on the base plane 13 in this embodiment). Is repeated a plurality of times, whereby a plurality of foam layers 21 are sequentially laminated and integrated in the space to form a hard foam layer 20 composed of a plurality of layers. In this embodiment, the discharge of the foamed resin raw material P is performed by using a spray type discharge device (construction device for in-situ foaming), and by using a nozzle N of the discharge device gripped by an operator as shown in FIG. This is performed by discharging the resin raw material P.

Examples of the foamed resin raw material P include polyurethane resin, polyisocyanurate, and the like which can be foamed at a construction site.
Examples thereof include polyamide, polyimide, and urea. In particular, it is desirable to use a rigid urethane foam that can be formed by spraying (spray forming). The rigid urethane foam,
Urethane-modified, carbodiimide-modified TDI prepolymer, crude TDI, polymeric MDI, various modified M
An isocyanate such as DI and a polyether polyol,
It is composed of a polyol composed of both or any one of polyester polyols, a catalyst such as an amine catalyst, and a foaming agent such as water, freon, or freon instead. In addition,
The main polyol is preferably a trifunctional or higher functional short-chain polyfunctional hydroxyl group having a hydroxyl value of 350 to 550, and more preferably an amine-based polyol having a high reactivity. Further, a monoamine, a diamine compound or the like may be added as a crosslinking agent to the rigid urethane foam.

When forming the hard foam layer 20 composed of a plurality of layers, first, as shown in FIG.
In this embodiment, the first foam layer 21 having a predetermined thickness is formed by discharging the foamed resin material P onto the basic plane 13 and leaving it to stand for a predetermined time to foam and harden the foamed resin material P. At this time, a drain groove (side groove) 22 is formed on the surface of the foam layer 21. In this embodiment, the drainage groove 22 is formed along the wall surface 15 by not discharging the foamed resin material P by a predetermined distance from the wall surface 15. The formation position of the drain groove 22 is usually on the wall surface 15 side as described above.
The present invention is not limited to this, and may be on the slope 12 side or substantially at the center depending on the situation of the construction site. Here, in order to improve the drainage efficiency of the drainage groove 22, it is preferable to provide a gradient on the bottom surface of the groove 22 along the drainage direction of the groove (vertical direction Y of the pavement shown in FIG. 4).

In this embodiment, as shown in FIG. 4, when the foam layer 21 is formed, the surface of the foam layer 21 is formed in a direction substantially perpendicular to the drain groove 22 (in FIG. A gradient a1 along the transverse direction X) is provided, so that the surface of the foam layer 21 becomes lower toward the drain groove 22. Further, in this embodiment, a gradient a2 is provided on the surface of the foam layer 21 along the drain direction of the drain groove 22 (in the drawing, the vertical direction Y of the pavement road). In addition, as described later, in order to improve the drainage efficiency of the foam layer surface,
It is preferable that both the gradients a1 and a2 are 1/100 or more.

Thereafter, as shown in FIG. 2B, the drainage groove 22 on the surface of the foam layer 21 already formed is filled with the foamed resin raw material P, and then as shown in FIG. ,
The first foam layer 21 is formed on the foam layer 21 already formed.
In the same manner as in the method of forming the drain groove 22, the foaming resin material P is discharged and foamed and hardened to form a gradient a1 on the surface.
A laminating step of forming a new foamed layer 21 having a2 and a drain groove 22 on the surface thereof is performed, and the laminating step is repeated a predetermined number of times to laminate a plurality of foamed layers 21 as shown in FIG. Thus, the hard foam layer 20 composed of a plurality of layers is formed. In this embodiment, the uppermost layer 21t of the hard foam layer 20 composed of a plurality of layers is formed such that the surface thereof has no slope and drainage grooves. Here, in the laminating step, a new foam layer 2
1 and forming the drainage groove 22, the foamed resin material P is discharged onto a part of the already formed foamed layer 21 and the drainage groove 22 filled with the foamed resin material P to form a new foamed layer 21. It may be formed, or a new drain groove 22 is located on the drain groove 22 filled with the foam resin material P by discharging the foam resin material P only on the foam layer 21 already formed. A new foam layer 21 may be formed as described above.

At the time of forming each foam layer 21 described above,
As shown in FIG. 6, a partition member 25 made of a block-like material or a plate-like material is disposed on the ground 11 or on the already formed foam layer 21, and the surface of the ground 11 or the surface of the already formed foam layer 21 is removed. The foam layer 21 may be formed in the foam layer forming section and the groove section forming section. In this way, the drain groove 22 can be formed simply and reliably. As the partition member 25, a material having excellent releasability from the foam layer 21, for example, a material made of polyethylene, fluororesin, or the like may be used, or a material having excellent adhesiveness to the foam layer 21 may be used. For example, a hard foam (of the same material as the foam layer 21) may be used. Here, in the case where a partition member having excellent releasability is used for the former foam layer 21, the partition member is removed after the formation of the foam layer 21, and on the other hand, the partition member has an adhesive property for the latter foam layer 21. When an excellent partition member is used, the partition member is bonded and integrated with the foam layer 21 and does not need to be removed.

As described above, when forming each foam layer 21, if the drain groove 22 is formed on the surface of the foam layer 21, even if rain, snow, etc. fall during the construction period, Rainwater, snowmelt, and the like that have fallen on the surface of the foam layer 21 formed at that time can be discharged by the drain groove 22. Therefore, it is possible to prevent the strength of the entire foam layer, that is, the overall embankment from being deteriorated due to the presence of water between the foam layers. Moreover, as in the case of covering the entire construction site with a tent described in the section of the prior art, the construction can be performed regardless of the situation (environment) of the construction site,
Also, when removing each sheet, as in the case of covering a plurality of sheets on each foam layer surface, it is possible to omit troublesome work such as removing rainwater and the like that has accumulated on the foam layer surface afterwards, thereby improving construction efficiency. Is greatly improved.

Further, as in this embodiment, each foam layer 2
1 is formed by forming a gradient a1 so that the surface thereof becomes lower toward the drainage groove portion 22, rainwater or snowmelt water falling on the surface of the foam layer 21 easily flows into the drainage groove portion 22, and Water hardly accumulates on the surface of the foam layer 21. Furthermore, if a gradient a2 along the drain direction of the drain groove is provided on the surface of each foam layer 21 as in this embodiment, the surface of the ground 11 or the surface of the already formed foam layer 21 (excluding the drain groove 22) is temporarily provided. ) Can reliably guide the water on the surface of the foam layer 21 to the drain groove 22 even if there is undulation (irregularity).

Here, as described above, the water flowing into the drainage groove portion 22 has a slope along the drainage direction of the groove portion in this embodiment, so that the water flowing into the drainage groove portion 22 has a slope. Collect at the lowest point. The water collected at the lowest point of the groove 22 is discharged to a nearby drainage channel or the like by an appropriate drainage means such as a drainage pump or a drainage tube installed at the point.

After the formation of the hard foam layer 20 composed of a plurality of layers, as shown in FIG. 5, a concrete slab 31, a subgrade 32, a roadbed 33, and a surface layer 34 are formed on the hard foam layer 20 to form a pavement. The construction of the road S is completed. FIG.
Reference numeral 31a denotes an anchor portion of the concrete floor slab 31, and C denotes an automobile passing on the pavement road S.

In the above-described embodiment, the embankment method for the pavement on the steep slope has been described. However, the present invention is not limited to this. For example, the embankment method for widening the pavement or preventing the subsidence of the ground. Can also be applied. In the case where the present invention is applied to a ground having no slope for preventing the land subsidence, as shown in FIG. 7, wall surfaces 42, 42 are erected on both sides of a foam layer forming space on the ground 41,
A foam layer 51 is formed in the space defined by the wall surfaces 42 and 42 in the same manner as in the above-described embodiment. FIG. 8 shows a state in which the formation of the first foam layer 51 is completed, and reference numeral 43 in the figure denotes a column made of H steel or the like, which constitutes the wall surface 42.
4 is a frame material also made of a steel plate or a concrete panel,
45 is a basic plane.

In the illustrated example, when each foam layer 51 is formed, drainage grooves 52, 52 along the wall surfaces 42, 42 are formed on both sides of the surface of the foam layer 51, and the surface of the foam layer 51 is formed. A gradient is provided on the surface of the foam layer 51 so as to become lower toward the drainage grooves 52, 52.

[0028]

As shown and described above, in the lightweight embankment method of the present invention, when forming each foam layer, a drainage groove is formed on the surface of the foam layer, so that rain or snow during the construction period. Even if it falls, the rainwater or snowmelt that has fallen on the surface of the foam layer formed at that time can be drained by the drain groove, and water can be prevented from accumulating on the surface of the foam layer. . Therefore, it is possible to prevent the strength of the entire foam layer, that is, the overall embankment from being deteriorated due to the presence of water between the foam layers. In addition, this construction method can be applied regardless of the conditions at the site, and eliminates the need for complicated work such as removing water accumulated on the surface of the foam layer as in the past, greatly reducing the work efficiency. improves.

According to a second aspect of the present invention, when forming each foam layer, a gradient is provided on the foam layer surface so that the surface of the foam layer becomes lower toward the drain groove. Rainwater, snowmelt, and the like, which have fallen on the foam layer surface, easily flow into the drainage groove, and water hardly accumulates on the foam layer surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a lightweight embankment method according to the present invention when a wall surface is erected.

FIG. 2 is a sectional view showing stepwise formation of a hard foam layer.

FIG. 3 is a cross-sectional view showing a state in which a foamed resin material is discharged in forming a hard foamed layer.

FIG. 4 is a partial perspective view showing a state where the formation of the first foam layer in the formation of the hard foam layer is completed.

FIG. 5 is a sectional view showing a pavement on a steep slope constructed according to the embodiment.

FIG. 6 is a cross-sectional view showing when a first foamed layer is formed in another embodiment.

FIG. 7 is a partial perspective view showing the completion of the formation of a first foamed layer in still another embodiment.

FIG. 8 is a cross-sectional view showing a pavement on a steep slope constructed by a conventional lightweight embankment method.

FIG. 9 is a cross-sectional view showing when a foamed resin material is discharged in a conventional lightweight embankment method.

FIG. 10 is a sectional view showing a state after the formation of the first foamed layer is completed.

[Explanation of symbols]

 11 ground 21 foam layer 22 drainage groove P foam resin material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsuo Shimizu 3-36 Imaikecho, Anjo-shi, Aichi F-term in Inoac Special Materials Co., Ltd. 2D044 CA00

Claims (2)

[Claims] 1. A lightweight embankment method in which a plurality of foamed layers are sequentially laminated and integrated by repeatedly discharging and foaming and hardening a foamed resin material on the ground in a plurality of times. By forming the first foamed layer by performing ejection and foaming hardening of the above, a drain groove is formed on the surface of the foamed layer when the foamed layer is formed, and then the surface of the foamed layer already formed is formed. The laminating process for forming a new foamed layer and a new drainage groove is performed by filling the drainage groove with the foamed resin material and discharging / foaming and curing the foamed resin material on the already formed foamed layer. A lightweight embankment method characterized by stacking and integrating a plurality of foam layers repeatedly. 2. The method according to claim 1, wherein, when forming each of the foam layers, a gradient is provided on the surface of the foam layer so that the surface of the foam layer becomes lower toward the drain groove. Lightweight embankment method.