JP2022068004A - Laying material - Google Patents

Abstract

To provide a laying material that actualizes a laying material being light in weight, having bearing capacity, and being excellent in installation ease.SOLUTION: A laying material (10) comprises a laying body (4) with a core material (1) having a specific foaming ratio, and non-foamed layers (2a, 2b) having a specific thickness laminated on both sides of the core material (1). The laying material body (4) includes a plurality of holes (4a) and pipes (3) fitted in the holes (4a).SELECTED DRAWING: Figure 1

Description

The present invention relates to a laying material, and particularly to a laying material used for raising and curing at a construction site or the like.

Conventionally, the curing laying board used at a construction site or the like is made of iron. This is because the iron curing laying plate can be used any number of times, and even if a heavy machine (heavy object) such as a crane is placed on it, it will not be damaged or sink.

However, the iron curing laying plate is a heavy object (for example, 22 mm thick × 1,524 mm width × 3,048 mm long size and a weight of about 800 kg). For this reason, the iron curing laying board has problems such as (i) the load capacity on the truck for transporting the curing laying board is limited, and (ii) the transportation work cannot be performed by one person.

On the other hand, a curing laminated board made of a synthetic resin has been proposed. For example, Patent Document 1 discloses an FRP-coated laminated board. The laminated board includes a molded body made of a large number of long glass fibers and a foamed resin, and the molded body is a laminated body in which the long glass fibers are laminated so that the directions of the long glass fibers are different from each other. Then, the outer surface of this laminated body is coated with FRP. Further, in the curing laying plate disclosed in Patent Document 2, a plurality of long plate-like bodies made of a resin molded body having a hollow structure are arranged in parallel, and the long plate-like bodies are arranged at both side edges on the hollow opening side. It is configured to be connected to each other by a connecting material.

Japanese Unexamined Patent Publication No. 9-262923 Japanese Unexamined Patent Publication No. 2006-34943

The curing laminates described in Patent Documents 1 and 2 have room for improvement in terms of lightness, bearing capacity, and ease of installation.

One aspect of the present invention is to realize a laying material which is lightweight, has a bearing capacity, and is excellent in ease of installation.

In order to solve the above problems, the laying material according to one aspect of the present invention is laminated on both sides of a core material made of a polyolefin-based foamed resin having a foaming ratio of 20 times or more and 60 times or less. The laying material main body is provided with a non-foaming layer made of a polyolefin resin having a thickness of 1 mm or more and 5 mm or less, and the laying material main body is a pipe made of a plurality of holes and a thermoplastic resin fitted in the holes. It is characterized by having.

According to one aspect of the present invention, it is possible to realize a laying material that is lightweight, has bearing capacity, and is excellent in ease of installation.

The structure of the laying material which concerns on embodiment of this invention is shown, 101 is a top view, 102 is a side view, and 103 is a sectional view taken along the line AA of 101.

An embodiment of the present invention will be described below, but the present invention is not limited thereto. The present invention is not limited to the configurations described below, and various modifications can be made within the scope of the claims. The technical scope of the present invention also includes embodiments or examples obtained by appropriately combining the technical means disclosed in the different embodiments or examples. Further, by combining the technical means disclosed in each embodiment, new technical features can be formed. In addition, all the academic documents and patent documents described in the present specification are incorporated as references in the present specification. Further, unless otherwise specified in the present specification, "A to B" representing a numerical range is intended to be "A or more (including A and larger than A) and B or less (including B and smaller than B)".

FIG. 1 is a diagram showing a configuration of a flooring material 10 according to the present embodiment. 101 of FIG. 1 is a top view, 102 of FIG. 1 is a side view, and 103 of FIG. 1 is a sectional view taken along line AA of 101 of FIG.

As shown in FIG. 1, the laying material 10 includes a laying material main body 4. The laying material main body 4 has a core material 1 and non-foamed layers 2a and 2b. The non-foamed layers 2a and 2b are laminated on the front surface and the back surface (both sides) of the core material 1, respectively. The core material 1 is made of a polyolefin-based foamed resin having a foaming ratio of 20 times or more and 60 times or less. The non-foamed layers 2a and 2b are made of a polyolefin resin. Each of the non-foamed layers 2a and 2b has a thickness of 1 mm or more and 5 mm or less. Here, with respect to the core material 1, the non-foamed layer 2a side is the upper side or the front surface side, and the non-foamed layer 2b side is the lower side or the back surface side. In the laying material 10 shown in FIG. 1, the back surface of the laying material main body 4 is used as the ground contact surface.

The laying material main body 4 includes a plurality of holes 4a and a pipe 3 made of a thermoplastic resin. The hole 4a is formed in the laying material main body 4 and penetrates the laying material main body 4. Further, the pipe 3 is fitted in the hole 4a.

The hole 4a extends in a direction perpendicular to the back surface of the laying material main body 4 which is the ground contact surface. When the laying material main body 4 is installed on a horizontal ground, the hole 4a extends in the vertical direction. The vertical direction here means the direction of gravity. Further, the vertical direction referred to here is intended to be perpendicular to the back surface within the measurement limit of the direction, and is a direction within a range of 90 ± 10 ° with respect to the back surface.

Here, since the laying material main body 4 has a structure in which the non-foamed layers 2a and 2b are laminated on both sides of the lining material 1, for example, even if a heavy machine comes and goes on the surface of the laying material main body 4, the laying material main body 4 The surface of the is not damaged. Further, since the laying material 10 according to the present embodiment has a structure in which the pipe 3 is fitted into the hole 4a of the laying material main body 4, the following effects (i) and (ii) are obtained. That is, (i) a load by a heavy machine or a person is applied to the pipe 3 in addition to the laying material main body 4, so that the load applied to the laying material main body 4 becomes small. Therefore, the deformation of the laying material main body 4 due to the above load is suppressed, and the compression resistance (ground bearing capacity) of the laying material 10 is improved. (Ii) Since the hollow portion is formed in the laying material main body 4 by the holes 4a and the pipe 3, the weight of the laying material 10 can be reduced.

As described above, according to the present embodiment, it is possible to realize a highly rigid laying material 10 having improved bearing capacity while maintaining weight reduction. Further, since such an effect is obtained, the laying material 10 according to the present embodiment can be easily installed on the ground, and the laying material 10 can be handled efficiently.

In the configuration shown in FIG. 1, the hole 4a penetrates the laying material main body 4. However, the hole 4a is not limited to the structure penetrating the laying material main body 4, and any structure may be adopted. For example, the hole 4a may be a bottomed hole extending from the non-foaming layer 2a to the middle of the core material 1, or a bottomed hole extending from the non-foaming layer 2b to the middle of the core material 1.

Furthermore, at the construction site in rainy weather, the slipperiness of people and heavy machinery due to the rainwater collected on the surface of the lumber may increase, resulting in poor work efficiency. If the hole 4a penetrates the laying material main body 4, rainwater collected on the surface of the laying material main body 4 flows to the bottom surface side through the pipe 3, so that the slipperiness can be alleviated. It works.

(Core material 1)
The material constituting the core material 1 is not particularly limited as long as it is a polyolefin-based resin having foamability. Examples of the polyolefin-based resin include polyethylene-based resin and polypropylene-based resin. Specific examples of the polyolefin-based resin monomer (hereinafter, also referred to as olefin-based monomer) include, for example, ethylene, propylene, butene-1, isobutene, pentene-1, 3-methyl-butene-1, Α with 2 to 12 carbon atoms such as hexene-1, 4-methyl-pentene-1, 3,4-dimethyl-butene-1, heptene-1, 3-methyl-hexene-1, octene-1, and decene-1. -Examples include olefins. These may be used alone or in combination of two or more.

Examples of other monomers having copolymerizability with the olefin-based monomer include cyclopentene, norbornene, 1,4,5,8-dimethano-1,2,3,4,4a, 8, and so on. Cyclic olefins such as 8a, 6-octahydronaphthalene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-hexadiene, methyl-1,4-hexadiene, 7-methyl-1,6- Examples include diene such as octadiene. These may be used alone or in combination of two or more.

Specific examples of the polyolefin resin include polyethylene-based resins containing ethylene as a main component such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene, and polypropylene-based resins containing propylene as a main component. Can be mentioned. These polyolefin-based resins may be used alone or in combination of two or more.

Among these polyolefin-based resins, the polypropylene-based resin containing polypropylene as a main component is particularly effective in the core material 1 of the bedding material 10 according to the present embodiment. Examples of the polypropylene-based resin include a propylene homopolymer, an ethylene-propylene random copolymer, a propylene-butene random copolymer, an ethylene-propylene-butene random copolymer, an ethylene-propylene block copolymer, and anhydrous. Examples thereof include a maleic acid-propylene random copolymer, a maleic anhydride-propylene block copolymer, and a propylene-g-maleic anhydride graft copolymer. These polypropylene-based resins may be used alone or in combination.

Further, the core material 1 is a foam molded product obtained by foam molding the foam particles or preliminary foam particles made of the above-mentioned foamable polyolefin resin.

For example, when the core material 1 is a polypropylene-based resin foam molded product, a conventionally known method can be adopted as the method for producing the foamed particles or the preliminary foamed particles. For example, foamed particles or pre-foamed particles can be produced by the following method. First, an aqueous dispersion medium containing polypropylene-based resin particles, a foaming agent, a dispersant, and a dispersion aid is charged in a closed container, and the temperature is raised to a constant temperature (hereinafter, may be referred to as foaming temperature) while stirring. The resin particles are impregnated with a foaming agent. Next, a foaming agent is additionally added as needed to keep the inside of the closed container at a constant pressure (hereinafter, may be referred to as foaming pressure), and then the contents are placed in a low pressure atmosphere from the lower part of the closed container. Release below. Here, the closed container to be used is not particularly limited as long as it can withstand the pressure inside the container and the temperature inside the container at the time of manufacturing the foamed particles or the preliminary foamed particles. Examples of the closed container include an autoclave type pressure-resistant container.

Examples of the foaming agent include aliphatic hydrocarbons such as propane, isobutane, normal butane, isopentane and normal pentane and mixtures thereof; inorganic gases such as air, nitrogen and carbon dioxide; and water. In order to obtain foamed particles or preliminary foamed particles having a higher foaming ratio, it is preferable to use isobutane, normal butane or a mixture thereof as the foaming agent. Further, in order to obtain foamed particles or preliminary foamed particles having a lower foaming ratio and a small variation in the foaming ratio, it is preferable to use water as the foaming agent.

Further, the amount of the foaming agent used varies depending on the type of polypropylene resin used, the type of foaming agent, the target foaming ratio, and the like, and cannot be unconditionally specified. For example, the amount of the foaming agent used is generally in the range of 2 to 60 parts by weight with respect to 100 parts by weight of the polypropylene-based resin.

The polypropylene-based resin foamed particles (or pre-foamed particles) can be made into a polypropylene-based resin foamed molded product by a conventionally known molding method. For molding the polypropylene-based resin foam molded product, for example, the methods (a) to (c) can be used. (B) Foamed particles or prefoamed particles are pressure-treated with an inorganic gas to impregnate the particles with an inorganic gas to apply a predetermined internal pressure to the particles, then filled in a mold and heat-fused with steam. (B) A method of filling a mold with foamed particles or pre-foamed particles in a state of being compressed by gas pressure and heating and fusing with steam using the recovery power of the particles, (c) Especially pretreatment. Examples thereof include a method in which foamed particles or pre-foamed particles are filled in a mold and heated and fused with steam.

Further, the above-mentioned molding method can be performed using a conventionally known mold device. The molding method using the mold apparatus includes a filling step of filling the molding space of the mold apparatus with foamed particles or pre-foamed particles, and heating to heat the foamed particles or pre-foamed particles filled in the molding space to foam fusion. It consists of four steps: a cooling step of cooling the foam body formed by the heating step, and a mold removal step of removing the foam body from the mold device. The filling step and the heating step are performed by, for example, any of the methods (a) to (c).

(Manufacturing method of the laying material main body 4 in which the holes 4a are formed)
The method for manufacturing the laying material main body 4 in which the holes 4a are formed is not particularly limited, and a conventionally known method can be adopted. For example, the manufacturing method includes a perforated core material forming step of forming the core material 1 in which the holes 4a are formed, and a coating step of coating the core material 1 in which the holes 4a are formed with the non-foamed layers 2a and 2b. including.

(Perforated core material forming process)
As the step of forming the perforated core material, a conventionally known method can be adopted. As a method of forming the hole 4a in the core material 1, for example, (a) a method of obtaining a foamed molded body of the core material 1 in which the hole 4a is formed in advance by in-mold molding, and (b) a block shape by in-mold molding. Examples thereof include a secondary processing method for forming a hole 4a by drilling a hole in the foam (core material 1) using a drill blade or the like.

The in-mold foam molding apparatus used in the method (a) has, for example, the following configuration.

The in-mold foam molding apparatus includes a cavity mold (first mold) and a core mold (second mold) arranged opposite to each other, a filler, a decompression unit, a compressed air supply unit, and a steam supply unit. , Is equipped. The filler fills the foamed particles or pre-expanded particles in the molding space formed by closing the cavity mold and the core mold. This filler transfers the foamed particles or pre-foamed particles to the molding space on the air flow. The decompression unit decompresses the molding space. The compressed air supply unit supplies compressed air into the molding space. The steam supply unit supplies steam into the molding space, and the steam heats and fuses the foamed particles or pre-foamed particles filled in the molding space. Of the cavity type and the core type, the cavity type is provided with an ejector pin for releasing the foamed molded product.

Further, in the in-mold foam molding apparatus, a hole forming portion for forming the hole 4a is provided in the forming space. This hole forming portion is formed so as to protrude from the cavity mold. By utilizing the hole forming portion in this way, the structure of the mold is not complicated.

Further, the in-mold foam molding apparatus is configured so that the mold release resistance of the foam molded product with respect to the cavity mold is larger than the mold release resistance of the foam molded product with respect to the core mold. Therefore, when the cavity mold and the core mold are opened, the foamed molded product can be stably left on the cavity mold side having the ejector pin. As a result, the mold releasability of the foam molded product with respect to the mold is improved.

In-mold molding of the core material 1 in which the holes 4a are formed is achieved by providing a columnar protrusions suitable for the holes 4a in the cavity mold as the hole forming portions. When forming the hole 4a penetrating the core material 1, the protrusion is configured to extend to the core mold (close to the core mold). Further, when forming a hole 4a (bottomed hole) extending halfway of the core material 1, the protrusion is configured so that the tip of the protrusion is separated from the core mold.

The foaming ratio of the polyolefin-based foamed resin constituting the core material 1 is 20 times or more and 60 times or less, preferably 25 times or more and 50 times or less, and more preferably 30 times or more and 40 times or less. When the foaming ratio is within the numerical range, the required compression resistance (ground bearing capacity) can be obtained while maintaining the light weight.

(Coating process)
The laying material 10 is repeatedly used at a construction site or the like. Therefore, it is necessary to coat both sides of the core material 1 in which the holes 4a, which is a foamed molded product, are formed with a non-foaming resin to form the non-foaming layers 2a and 2b (coating step).

The method of coating the non-foamed layers 2a and 2b on the core material 1 in which the holes 4a are formed is not particularly limited, and conventionally known methods can be adopted. As the method, (a) a twin blow molding method described in JP-A-2000-218682, (b) a method of heating a non-foamed resin film and laminating it on a foam molded body, and crimping the laminated body. (C) An example is a method in which a hot melt film is interposed between a non-foamed resin and a foam molded body and thermocompression bonded. Among these methods, the twin blow molding method (a) described above is preferable from the viewpoint of productivity and adhesive stability of the non-foamed resin.

The twin blow molding method is performed as follows. First, a pair of sheet-shaped parisons extruded from the resin extrusion head are arranged between the split dies. The pair of sheet-shaped parisons constitutes the non-foamed layers 2a and 2b. Next, the sheet-shaped parison is brought into close contact with the surface of the cavity by vacuum-sucking the space between the cavity surface of the split mold and the sheet-shaped parison. Next, after arranging the foam molded body between the pair of sheet-shaped parisons, the split mold is tightened so that the periphery of the cavity is in close contact with each other. As a result, the pair of sheet-shaped parisons in the split mold are closed. Then, a pressure fluid is introduced into the closed sheet-shaped parison to blow-mold a non-foamed resin hollow molded product containing a foam-molded body. The hollow molded product has a structure in which the non-foamed layers 2a and 2b are coated on both sides of the core material 1 in which the holes 4a are formed.

By adopting the above-mentioned twin blow molding method, the non-foaming resin can be effectively and efficiently coated and composited on the foamed molded product having poor adhesiveness.

As a result of the coating step, the non-foamed layers 2a and 2b are also formed in the holes 4a formed in the core material 1. That is, the holes 4a are closed by the non-foaming layers 2a and 2b. The closed portion of the hole 4a in the non-foamed layers 2a and 2b is removed by a cutting blade such as a cutter, a drill, or a punch. Thereby, the holes 4a can be formed in the non-foamed layers 2a and 2b as well.

(Non-foamed layers 2a and 2b)
The materials of the non-foamed layers 2a and 2b (corresponding to the sheet-shaped parison) are not particularly limited as long as they are polyolefin-based resins. Examples of the material include thermoplastic resins such as polyethylene-based resin, polypropylene-based resin, polyamide-based resin, polystyrene-based resin, ABS resin, and polyethylene terephthalate resin.

Further, considering the recyclability of the lumber body 4, the non-foamed layers 2a and 2b are preferably made of the same material as the core material 1. When the core material 1 is made of polypropylene foam, the non-foamed layers 2a and 2b are preferably polypropylene-based resins which are the same material as the core material 1.

Further, considering the coating of the non-foamed layers 2a and 2b by the twin blow molding method, the polypropylene-based resin suitable for the sheet-shaped parison has (i) a variation in wall thickness due to drawdown, neck-in, etc. during the blow molding process. From the viewpoint of preventing the occurrence, it is preferable to use a material having a high dissolution tension. On the other hand, as the polypropylene-based resin, it is preferable to use a material having high fluidity in order to (ii) improve the transferability and followability to the separation mold. The polypropylene-based resin satisfying the above (i) and (ii) has, for example, a melt flow rate at 230 ° C. (MFR; measured at a test temperature of 230 ° C. and a test load of 2.16 kg according to JIS K-7210). The material is 0.0 g / 10 minutes or less, preferably 0.3 to 1.5 g / 10 minutes.

Further, the polypropylene-based resin used as the sheet-shaped parison may contain an additive. Examples of the additive include inorganic fillers such as silica, mica, talc, calcium carbonate, glass fiber and carbon fiber, plasticizers, stabilizers, colorants, antistatic agents, flame retardants and the like.

Among the above-mentioned additives, for example, silica, mica, glass fiber and the like are added in an amount of 50% by weight or less, preferably 30% by weight or more and 40% by weight or less, based on the polypropylene resin.

The thickness of the non-foamed layers 2a and 2b is 1 mm or more and 5 mm or less, preferably 1.5 mm or more and 4 mm or less, and particularly preferably 1.5 mm or more and 3 mm or less. When the thickness is less than 1 mm, when a heavy machine (heavy object) such as a crane is placed on the laying material main body 4, the non-foamed layer 2a cannot withstand the shearing caused by the tire turning of the heavy machine, and the surface becomes surface. It becomes uneven and tends to significantly reduce the wear resistance of the laying material main body 4. On the other hand, if the thickness exceeds 5 mm, the weight of the laying material main body 4 is unnecessarily increased, the lightness is impaired, and the handling property such as the portability of the laying material 10 tends to be deteriorated.

(Hole 4a and pipe 3 of the laying material main body 4)
A pipe 3 made of a thermoplastic resin is fitted in the hole 4a of the laying material main body 4. The thermoplastic resin constituting the pipe 3 is not particularly limited as long as it is a conventionally known resin. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polycarbonate resin, polyvinyl chloride resin, ABS resin and the like.

Considering the recyclability of the laying material 10, the pipe 3 is preferably made of the same material as the core material 1 and the non-foaming layers 2a and 2b. When the core material 1 and the non-foamed layers 2a and 2b are made of polypropylene resin, it is preferable that the pipe 3 is made of polypropylene-based resin.

The cross-sectional shape of the pipe 3 is not particularly limited, and examples thereof include a circle, an ellipse, a square, a rectangle, a rhombus, and a triangle. Considering the workability of fitting into the hole 4a, the cross-sectional shape of the pipe 3 is preferably circular.

The arrangement of the pipes 3 is preferably an arrangement in which the pipes 3 are arranged vertically and horizontally over the entire surface of the laying material main body 4. By adopting such an arrangement, the load of a heavy machine such as a crane mounted on the laying material main body 4 (load considering the tire position) can be evenly received. In the configuration shown in FIG. 1, the pipes 3 are arranged in rows at equal intervals, 5 in each of the vertical direction and the horizontal direction, over the entire area of the laying material main body 4.

Further, the ratio of the area occupied by the hole 4a into which the pipe 3 is inserted to the surface area of one surface of the laying material main body 4 is preferably 1.8% or more and 20% or less.

When the ratio of the area is less than 1.8%, the heavy machine may be placed in a place other than the hole 4a in which the pipe 3 is fitted, and the laying material 10 tends to be compressed and deformed to cause problems such as non-landing. There is. That is, it cannot withstand the load of a heavy machine such as an outrigger, and the laying material main body 4 is largely compressed and deformed in the thickness direction in the region of the core material 1 (the region other than the fitting portion of the pipe 3), and the laying material main body 4 Is dented.

Further, when the ratio of the area exceeds 20%, the ratio of the pipe 3 fitted in the hole 4a to the entire laying material main body 4 becomes large, and the lightness of the laying material 10 tends to decrease. Such a tendency is seen when the diameter of the pipe 3 is reduced and the number of holes 4a is increased.

On the other hand, when the ratio of the area exceeds 20% and the diameter of the hole 4a is increased, a heavy machine such as an outrigger enters the hole 4a, and the laying material 10 tends to have problems such as non-landing. Such a tendency is seen when the diameter of the pipe 3 is increased and the number of holes 4a is reduced.

The thickness of the pipe 3 can be arbitrarily set as long as the above-mentioned effect is obtained. From the viewpoint of realizing a laying material 10 that can withstand a compressive load due to a heavy machine such as an outrigger and shearing due to tire turning, the thickness of the pipe 3 is 8% or more of the outer diameter of the pipe 3. preferable.

The pipe 3 preferably has a cylindrical shape having an outer diameter of 30 mm or more and 100 mm or less.

Consider the case where the ratio of the area of the hole 4a to the surface area of the lining material body 4 is in the optimum numerical range (for example, 1.8% or more and 20% or less). When the outer diameter of the pipe 3 is less than 30 mm, the number of pipes 3 fitted into the holes 4a increases, and the weight of the laying material 10 increases. Therefore, the lightness of the laying material 10 is lowered, and the handleability of the laying material 10 tends to be deteriorated. Further, when the outer diameter of the pipe 3 exceeds 100 mm, the number of pipes 3 fitted into the holes 4a decreases, and the area of the region other than the fitting portion of the pipes 3 increases. Therefore, when a heavy machine is placed on the laying material 10, the laying material 10 tends to be easily compressed and deformed, and problems such as non-landing tend to occur.

(Use of laying material 10, specifications of laying material 10)
The use of the laying material 10 according to the present embodiment is not particularly limited, but it is preferably used as a laying board laid in a construction work at a construction site or a construction site. In particular, among the above-mentioned construction works, it is preferable that the laying material 10 according to the present embodiment is used for the construction work of soil concrete.

Generally, soil concrete such as a parking lot has a three-layer structure in which a ground, a crushed stone layer, and a concrete layer are laminated in this order. In order to withstand the load, reinforcing bars called "wire mesh" or "welded wire mesh" are embedded in the concrete layer.

The construction work of the soil concrete is performed as follows.

First, (i) at the time of building the residential land, the soil on the surface is excavated with a shovel car, a shovel, or the like in order to match the height of the surroundings at the soil concrete construction site (for example, a parking lot). An example of the construction depth of soil concrete is 10 cm for the crushed stone layer and 10 cm for the concrete layer, for a total of 20 cm. At soil concrete construction sites, soil is usually piled up to the same height as the road boundary. Therefore, it is necessary to scrape the soil for 20 cm on the surface.

Next, crushed stones are laid in order to prevent the ground from sinking after the (ii') concrete construction and to evenly flatten the construction surface. Then, in order to facilitate the traffic of heavy machinery for concrete construction, an iron plate is laid on the crushed stones that have been laid. Here, the crushed stone directly under the iron plate becomes finer due to the traffic of the heavy machinery, and becomes bad soil for the ground subsidence after the concrete construction or for flattening the construction surface uniformly. Therefore, in consideration of the occurrence of such bad soil, crushed stones are laid in the soil concrete construction site in addition to the volume of the crushed stone layer by the volume of the concrete layer. When the construction is carried out based on the above-mentioned example of the construction depth, the crushed stone is laid with an extra volume of 10 cm of the concrete layer in addition to the volume of the crushed stone layer of 10 cm.

Subsequently, (iii') crushed stone corresponding to the volume of the concrete layer that has become bad soil is excavated. Then, the crushed stone is compacted as the foundation of the foundation part to form a crushed stone layer so that the heavy concrete does not sink under its own weight.

Subsequently, (iv) a formwork having a shape to be concreted is installed. Then, after installing the wire mesh for improving the strength of the concrete, the concrete is poured and the concrete surface is finished to form a concrete layer.

In the conventional soil concrete construction method, extra crushed stone is required by the volume of the concrete layer in the step (ii'). Then, this crushed stone is removed in the step (iii') and treated as industrial waste. For this reason, the conventional construction method requires such industrial waste treatment of crushed stone, which complicates the construction procedure and has a problem that the industrial waste treatment is costly.

Therefore, if the laying material 10 according to the present embodiment is used for the method of constructing the soil concrete, the industrial waste treatment of crushed stone is not required. Therefore, the construction procedure of the soil concrete can be rationalized and the construction cost can be reduced.

More specifically, it is necessary to treat the industrial waste of the crushed stone by substituting the crushed stone for the volume of the concrete layer, which was extra required in the step (ii'), with the laying material 10 according to the present embodiment. It is possible to realize construction that does not require. That is, the method of constructing the soil concrete using the laying material 10 according to the present embodiment includes the following steps (ii) and (iii) instead of the steps (iii) and (iii').

(Ii) Crushed stones corresponding to the volume of the crushed stone layer are spread on the excavated part of the above (i). Then, in order to facilitate the traffic of heavy machinery for concrete construction, the laying material 10 is laid on the crushed stones that have been laid. That is, the laying material 10 according to the present embodiment can be used for raising and curing the volume of the crushed stone to be laid by the volume of the concrete layer.

(Iii) After removing the bedding material 10, the crushed stone is compacted to form a crushed stone layer as a base of the foundation portion.

In this way, by using the laying material 10 for raising and curing the volume of the concrete layer, it is possible to secure a space for concrete placement from the time of building the residential land to the time of placing the soil concrete. Therefore, it is possible to save the trouble of excavating crushed stone and reduce the industrial waste cost of crushed stone (bad soil). Further, since the laying material 10 is lightweight and has a bearing capacity, it becomes easy for people and heavy machinery to come and go on the laying material 10, and the handling work (replacement installation work) of the laying material 10 becomes easy. .. Furthermore, it is possible to prevent the laying material 10 from becoming muddy during the construction period.

When the laying material 10 is used in the soil concrete construction method, the thickness of the laying material 10 is the thickness of the concrete layer in order to replace crushed stones and secure a space for placing concrete during the construction. It may be the same as. The thickness of the lining material 10 is preferably 100 to 400 mm, more preferably 150 to 200 mm.

In order to secure the strength of the soil bearing capacity of the soil concrete, the thickness of the laying material 10 needs to be 100 mm or more. On the other hand, in view of economic efficiency, the thickness of the laying material 10 may be 400 mm or less from the viewpoint of reducing the amount of concrete used carelessly.

Further, the width and length dimensions of the laying material 10 are not particularly limited. Considering the handleability and the storage space when not in use, the width and length of the lining material 10 are preferably 1500 mm square or less.

Further, in consideration of handleability such as portability, the weighing material 10 is less than 30 kg / m ² , preferably less than 25 kg / m ² , and more preferably less than 18 kg / m ² . The total weight of the laying material 10 is preferably less than 25 kg, more preferably less than 15 kg.

〔summary〕
The laying material 10 according to the first aspect of the present invention has a core material 1 made of a polyolefin-based foamed resin having a foaming ratio of 20 times or more and 60 times or less, and a thickness of 1 mm or more and 5 mm laminated on both sides of the core material 1. A laying material main body 4 having the following non-foamed layers 2a and 2b made of a polyolefin resin is provided, and the laying material main body 4 is made of a plurality of holes 4a and a thermoplastic resin fitted in the holes 4a. It is a configuration including a pipe 3.

The laying material 10 according to the second aspect of the present invention has a configuration in which the hole 4a is formed so as to penetrate from the front surface to the back surface of the laying material main body 4 in the first aspect.

The laying material 10 according to the third aspect of the present invention has a configuration in which the pipe 3 is arranged vertically and horizontally over the entire surface of the laying material main body 4 in the first or second aspect.

The laying material 10 according to the fourth aspect of the present invention has a structure in which the pipe 3 has a cylindrical shape having an outer diameter of 30 mm or more and 100 mm or less in any one of the first to third aspects.

The bedding material 10 according to the fifth aspect of the present invention has a configuration in which the ratio of the area of the holes to the surface area of the bedding material main body 4 is 1.8% or more and 20% or less in any one of the first to fourth aspects. be.

The laying material 10 according to the sixth aspect of the present invention has a thickness of 100 mm or more and 400 mm or less and a basis weight of less than 30 kg / m ² in any one of the first to fifth aspects.

In any of aspects 1 to 6, the laying material 10 according to the seventh aspect of the present invention has the core material 1, the non-foamed layers 2a and 2b, and the pipe 3 made of a polypropylene resin.

The bedding material 10 according to the eighth aspect of the present invention has a configuration used for raising and curing in any one of the first to seventh aspects.

Hereinafter, specific examples and comparative examples of the present invention will be described. The present invention is not limited to the following examples, and can be appropriately modified and implemented without changing the gist thereof.

(Evaluation item)
Assuming the environment in which the laying material 10 is used as a laying curing material, the following items were evaluated.

1. 1. Outrigger load evaluation (conditions for heavy machinery and laying material 10)
Heavy equipment weight 13t, outrigger diameter 300mm diameter (4 locations),
Size of laying material 10; 1,000 mm width x 1,000 mm length x 150 mm thickness Place of laying material 10; Soil mixed with gravel (actual construction site).

(Evaluation methods)
A heavy machine of the above weight was placed in the center of the laying material 10 with an outrigger, and the load was removed after 10 minutes had passed. Then, the amount of restoration of the subducted portion of the laying material 10 at the portion subjected to the load by the outrigger was measured.

(Evaluation index)
Restoration amount is less than 5 mm: 〇, restoration amount is 5 mm or more and less than 10 mm: Δ, restoration amount is 10 mm or more: ×.

2. 2. Heavy equipment tire shear evaluation (conditions for heavy equipment and laying material 10)
Heavy equipment weight 13t, tire size 275/80 R22.5 149 / 146J
Size of laying material 10; 1,000 mm width x 1,000 mm length x 150 mm thickness Place of laying material 10; Soil mixed with gravel (actual construction site).

(Evaluation methods)
The tires of the heavy machinery of the weight were cut back five times on the laying material 10, and scratches and dents on the surface of the laying material 10 were visually evaluated.

(Evaluation index)
No significant scratches: 〇, scratches with a depth of less than 5 mm: △, scratches with a depth of 5 mm or more: ×.

3. 3. Weight of laying material 10 The weight of laying material 10 was evaluated as an index of portability.

(Evaluation index)
Less than 18 kg: 〇, 18 kg or more and less than 30 kg: Δ, 30 kg or more: ×.

(Example 1)
As the core material 1, a polypropylene foam molded product having the following composition (Eperan RBS 30 times manufactured by Kaneka Corporation) was prepared.

Size: 1,000 mm width x 1,000 mm length x 150 mm thickness, foaming magnification: 30 times, through hole (hole 4a) diameter: φ63.5 mm, through hole arrangement: inside the four corners of the polypropylene foam molded body Through holes were provided at 25 locations in the plane so as to have a pitch of 200 mm from the 100 mm position. Area ratio of through holes to the area of the surface of the polypropylene foam molded product: 7.9%.

Next, a polypropylene resin layer (non-foamed layers 2a and 2b) having a thickness of 2 mm was coated on both sides of the polypropylene foam molded product by a twin blow molding method. Then, the polypropylene resin layer coated on the portion of the hole 4a was removed. In this way, a polypropylene resin-coated polypropylene foam molded body (laying material main body 4 in which the holes 4a were formed) having through holes (holes 4a) provided at 25 in-planes was obtained.

Then, a polypropylene resin pipe 3 was inserted into 25 through holes to obtain a laying material 10 as a laying curing laying board. As the pipe 3, a pipe having a diameter of φ63 mm, a wall thickness of 5.8 mm, and a length of 150 mm (ASAHI AV manufactured by Asahi Organic Materials Industry Co., Ltd.) was used.

Using this laying material 10, outrigger load evaluation, heavy equipment tire shear evaluation, and laying plate weight evaluation were carried out. The evaluation results are shown in Table 1.

(Example 2)
The laying material 10 was obtained in the same manner as in Example 1 except that the foaming ratio of the core material 1 was set to 50 times. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Example 3)
The bedding material 10 was obtained in the same manner as in Example 1 except that the polypropylene resin layer covering the core material 1 had a thickness of 4 mm. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Example 4)
The hole diameter of the through hole provided in the core material was set to φ32.5 mm, and 25 through holes were provided. The area ratio of the through holes to the surface area of the polypropylene foam molded product is 2.1%.

The dimensions of the pipe 3 to be fitted into the through hole were 32 mm in diameter, 3.0 mm in wall thickness, and 150 mm in length.

Except for the above items, the litter 10 was obtained in the same manner as in Example 1. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Example 5)
The hole diameter of the through hole provided in the core material was φ90.5 mm, and 25 through holes were provided. The area ratio of the through holes to the surface area of the polypropylene foam molded product is 16.1%.

The dimensions of the pipe to be fitted into the through hole were 90 mm in diameter, 8.2 mm in wall thickness, and 150 mm in length.

Except for the above items, the litter 10 was obtained in the same manner as in Example 1. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Example 6)
The hole diameter of the through hole provided in the core material was φ63.5 mm, and through holes were provided at 49 in-plane positions so as to have a pitch of 150 mm from the inside 50 mm position of the four corners of the polypropylene foam molded body. The area ratio of the through holes to the surface area of the polypropylene foam molded product is 15.5%.

Except for this matter, the litter 10 was obtained in the same manner as in Example 1. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 1)
The laying material 10 was obtained in the same manner as in Example 1 except that the foaming ratio of the core material 1 was set to 5 times. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 2)
The laying material 10 was obtained in the same manner as in Example 1 except that the foaming ratio of the core material 1 was set to 80 times. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 3)
The bedding material 10 was obtained in the same manner as in Example 1 except that the polypropylene resin layer covering the core material 1 had a thickness of 10 mm. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 4)
The laying material 10 was obtained in the same manner as in Example 1 except that the core material 1 was not coated with the polypropylene resin layer. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 5)
The laying material 10 was obtained by the same method as in Example 1 except that the core material 1 was not provided with a through hole and the pipe 3 was not fitted. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

(Comparative Example 6)
The laying material 10 was obtained in the same manner as in Example 1 except that the pipe 3 was not fitted. Outrigger load evaluation, heavy equipment tire shear evaluation, and floor plate weight evaluation were performed on the obtained floor material 10. The evaluation results are shown in Table 1.

The present invention can be used as a laying material at a construction site such as a parking lot.

1 Core material 2a, 2b Non-foamed layer 3 Pipe 4 Laying material body 4a Hole 10 Laying material

Claims (8)

A core material made of a polyolefin-based foamed resin having a foaming ratio of 20 times or more and 60 times or less,
A laying material main body having a non-foamed layer made of a polyolefin resin having a thickness of 1 mm or more and 5 mm or less laminated on both sides of the core material is provided.
The lining material body is
With multiple holes,
A laying material comprising a pipe made of a thermoplastic resin fitted into the hole. The laying material according to claim 1, wherein the holes are formed so as to penetrate from the front surface to the back surface of the laying material main body. The laying material according to claim 1 or 2, wherein the pipes are arranged vertically and horizontally over the entire surface of the laying material main body. The laying material according to any one of claims 1 to 3, wherein the pipe has a cylindrical shape having an outer diameter of 30 mm or more and 100 mm or less. The lining material according to any one of claims 1 to 4, wherein the ratio of the area of the holes to the surface area of the lining material body is 1.8% or more and 20% or less. The lining material according to any one of claims 1 to 5, wherein the thickness is 100 mm or more and 400 mm or less, and the basis weight is less than 30 kg / m ² . The laying material according to any one of claims 1 to 6, wherein the core material, the non-foamed layer, and the pipe are made of a polypropylene-based resin. The lining material according to any one of claims 1 to 7, which is used for raising and curing.

Images