JP2008274609A - Slope widening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slope widening structure which exerts high safety even in an inclined plane, particularly, an inclined plane section with an angle of inclination exceeding 45°, which facilitates construction work, and which is advantageous in costs. <P>SOLUTION: This slope widening structure comprises: a water-permeable material 3 which is annexed along the inclined plane 2A composed of natural ground 2; a drainage material layer 4 which is composed of foam piece aggregate with a permeability coefficient of 0.1 cm/sec or more, a compressive strength of 30-300 kPa and a thickness of 50-200 mm, formed on the surface of the water-permeable material 3; a foamed synthetic resin block layer 6 which is constituted by laying and stacking a plurality of foamed synthetic resin blocks 5A and 5B constructed on the front side of the drainage material layer 4; a filling material 7 which is infilled between the foamed synthetic resin block layer 6 and the drainage material layer 4; a drain pipe 8 which communicates with the drainage material layer 4; and a covering section 9 which is formed above the foamed synthetic resin block layer 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inclined ground widening structure, and more particularly to an inclined ground widening structure comprising a foamed synthetic resin block layer formed by laying and laminating a plurality of foamed synthetic resin blocks.

In civil engineering work such as roads, railways, land preparation, etc., it has been conventionally performed to construct a sloped land widening structure composed of foamed synthetic resin block layers that are laid and laminated for road surface widening. Yes.
For example, in a construction for widening a road lane on an inclined land, a retaining wall 102 made of a concrete panel such as precast concrete (PC) is erected on an inclined surface 101 such as a natural ground as shown in FIG. A plurality of rectangular parallelepiped foamed synthetic resin blocks 103 are laid in the horizontal direction on the back side of the retaining wall 102 and laminated in the vertical direction to form the foamed synthetic resin block layer 104. Then, the space between the end surface on the inclined surface side of the foamed synthetic resin block layer 104 and the inclined surface 101 is filled with a backfilling material made of crushed stone to form a drainage portion 105, and the foamed synthetic resin block layer 104. A covering portion 106 made of a concrete floor board, asphalt pavement, or the like is formed on the upper side of the slope to constitute the inclined land widening structure 100.

  However, since the weight per unit volume of the crushed stone is heavy in the inclined land widening structure using the backfill material made of crushed stone as described above, the earth pressure applied to the foamed synthetic resin block layer is increased, and the It was necessary to construct a sloped widening structure requiring strong retaining walls. In addition, when it rains heavily and exceeds the drainage capacity of the drainage section made of crushed stone, the earth pressure rises rapidly, cracking occurs in the retaining wall, the retaining wall falls, or the reinforcement that constitutes the retaining wall Inconveniences such as deformation of the steel frame occurred. Furthermore, when using crushed stone with a large unit volume weight as a backfill material in this way, a large transport vehicle, civil engineering machinery, etc. are required to transport and fill the crushed stone to the site. The construction work was difficult, took a long time, and was expensive.

  Therefore, in order to solve the above problems, as a backfilling material, the volume of waste synthetic resin is reduced and then pulverized synthetic resin granules are used (Patent Document 1). The thing using the filling thing (patent document 2) or the thing using the plate-shaped foam piece molded body (patent document 3) is proposed.

JP-A-11-1000084 JP-A-9-195277 Japanese Patent Laid-Open No. 2005-207108

  However, in the case of using a pulverized synthetic resin granule or a product filled with synthetic resin foam particles as a back-filling material, the compressive strength is low, and if a pressure is applied, the synthetic resin granule or the synthetic resin Since the expanded particles are easy to move, there is a drawback that a gap is easily formed, and cracks and depressions are sometimes generated in the covering portion (road surface) formed above. In addition, in the case of using a plate-like foam piece molded product, the compressive strength is higher than that of the above-mentioned pulverized synthetic resin granules or synthetic resin foam particles filled in a bag, and shape retention However, because of its excellent shape retention, it is difficult to follow the undulations (concaves and depressions) of the inclined surface of the natural ground. A lot of gaps are generated between them, and the contact resistance is low. When used on a steep slope, for example, a slope with a steep slope exceeding 45 degrees, it is formed by the plate-like foam piece molding. Depending on the construction condition, the drainage part may move out of the way, especially when it rains more than expected, leaving room for improvement.

  The present invention has been made in view of the above-described background art, and has a high safety even on an inclined surface, particularly an inclined surface portion exceeding 45 degrees, and the construction work is simple and advantageous in terms of cost. The object is to provide a structure.

In order to achieve the above object, the present invention is an inclined land widening structure described in the following [1] to [3].
[1] A water permeable material attached along an inclined surface made of natural ground, a water permeability coefficient formed on the surface of the water permeable material of 0.1 cm / sec or more, a compressive strength of 30 to 300 kPa, and a thickness of A drainage material layer composed of a 50-200 mm foam composite, a foamed synthetic resin block layer formed by laminating a plurality of foamed synthetic resin blocks constructed on the surface side of the drainage material layer, and the foam A filling material filled between the synthetic resin block layer and the drainage material layer, a drain pipe communicated with the drainage material layer, and a covering portion formed above the foamed synthetic resin block layer An inclined land widening structure.
[2] The inclined land widening structure according to [1], wherein the padding material is an end material of a foam piece assembly that forms the drainage material layer.
[3] The inclined land widening structure according to the above [1] or [2], wherein the inclined surface formed of the natural ground has an inclined surface portion having a gradient exceeding 45 degrees.

  The sloped land widening structure according to the present invention described above has a drainage material layer excellent in lightness, drainage and slip resistance between the foamed synthetic resin block layer and the sloped surface made of natural ground. It has excellent earth pressure reduction effect which is a problem in structures, and can effectively suppress the rise of earth pressure even if it rains heavily, so it is safe even on steep slopes, for example, slopes with slopes exceeding 45 degrees A wide sloped structure with high slope can be constructed. In addition, because of the excellent earth pressure reduction effect, it is possible to simplify the retaining wall composed of H rope piles, etc., and also to design without a retaining wall, making construction work easy and cost effective. A structure can be provided. In addition, it is possible to prevent cracks and depressions from occurring in the covering portion of the inclined land widening structure.

  Hereinafter, a preferred embodiment of the above-described inclined land widening structure according to the present invention will be described in detail with reference to the drawings.

  An inclined land widening structure 1 according to the present invention is formed on a surface of the water permeable material 3 and a water permeable material 3 attached along an inclined surface 2A made of a natural ground 2, for example, as shown in FIG. A foamed synthetic resin block layer 6 formed by laying and laminating a plurality of foamed synthetic resin blocks 5 constructed on the surface side of the drainage material layer 4; Formed above the foamed synthetic resin block layer 6, a filling material 7 filled between the foamed synthetic resin block layer 6 and the drainage material layer 4, a drain pipe 8 communicated with the drainage material layer 4, and And a covered portion 9.

  The inclined surface 2A composed of the natural ground 2 includes a slope having an inclination formed originally by excavation or embedding work in addition to a slope having an original slope, and the slope α is, for example, 45 degrees. In particular, the inclined land widening structure according to the present invention is effective when the slope has a steep slope exceeding 45 mm or when the slope has a slope part with a steep slope exceeding 45 degrees. In the case of a steep slope, this works on the foamed synthetic resin block layer 6 in which the influence of earth pressure is conspicuously built. However, the sloped land widening structure according to the present invention has a high drainage and is along the undulations (unevenness) of the natural ground. Since the drainage material layer 4 can be formed in an intimate contact state, slip along the inclined surface 2A hardly occurs, and an inclined land widening structure with high safety can be constructed even on a steep inclined surface exceeding 45 degrees.

  In the inclined land widening structure 1 according to the present invention, the water-permeable material 3 is first attached along the inclined surface 2 </ b> A composed of the natural ground 2. The water permeable material 3 reinforces the surface of the natural ground to prevent slippage due to the collapse of soil, sand, gravel, etc., and alleviates minute undulations (irregularities) on the surface of the natural ground. It helps prevent clogging caused by earth and sand. In addition, the water contained in the ground is guided to the surface side and drained. As the water permeable material 3, a nonwoven fabric, a woven fabric, a geotextile, a split fabric, or the like is used, and among these, a nonwoven fabric, particularly felt, is preferable from the viewpoint of strength and frictional resistance with the drainage material layer 4. The thickness is preferably 5 to 50 mm, more preferably 5 to 25 mm. If the thickness of the water-permeable material 3 is too thin, the intended purpose may not be exhibited, and if it is too thick, there is a risk of causing problems in the strength of the inclined land widening structure due to insufficient compressive strength. Cost increases.

  On the surface of the water-permeable material 3 attached to the natural ground 2, a drainage material layer 4 made of a foam piece assembly is formed. The foam piece combined body which forms this drainage material layer 4 is manufactured by combining a plurality of thermoplastic resin foam pieces. Examples of the thermoplastic resin constituting the thermoplastic resin foam piece (hereinafter also simply referred to as “foam piece”) include, for example, a styrene homopolymer and a copolymer of monomer components copolymerizable with styrene. Polypropylene resins such as polystyrene resins such as polyethylene resins such as low density polyethylene, high density polyethylene, linear low density polyethylene, propylene homopolymers, copolymers with monomer components copolymerizable with propylene Examples thereof include resins. Among these, those containing 50% by weight or more of a polystyrene-based resin are preferable in that foaming is easy and an excellent light weight and compressive strength can be obtained. The polystyrene resin is preferably copolymerized or mixed with an olefin component or a rubber component within the above range for the purpose of improving brittleness or improving compression creep characteristics. In addition, a resin containing 50% by weight or more of a polypropylene-based resin is preferable in that a material having excellent brittleness, compressive creep characteristics and compressive strength is obtained, but the thermoplastic resin is not limited to these.

  Examples of the shape of the foam piece include an indefinite shape made of a pulverized foam, a cylindrical particle shape, and a chip shape. Among these, a cylindrical particle shape or a chip shape is preferable. When a cylindrical particle-shaped or chip-shaped foam piece is used, a foam having excellent compressive strength and drainage properties can be easily obtained. Particularly, when a chip-shaped foam piece is used, foaming is particularly excellent in drainage performance. A body piece combination can be obtained easily.

In addition, when the foam piece shape is a chip shape, the size of the foam piece is a foam piece combination that combines mold filling ability, high porosity, and high compressive strength when forming the foam piece assembly. In obtaining the body, the average length of the longest part is preferably 5 to 50 mm, more preferably 10 to 35 mm. Moreover, when the foam piece shape is a cylindrical particle shape, the size of the foam piece is preferably 2 to 20 mm and more preferably 3 to 10 mm in the average length of the longest part for the same reason as the chip shape. . In the case of an indefinite shape such as a foam pulverized product, the size of the foam piece is the longest of 30% by weight or more of the total weight of the foam piece used for molding for the same reason as the chip-like one. It is preferable that it is 5-50 mm in the length of a part, and it is more preferable that it is 10-35 mm.
In addition, the length of the longest part of the foam piece in this specification means the maximum dimension when the external dimensions are measured with calipers in all directions of the foam piece. And the average length of the longest part means the arithmetic average value of the length of the longest part of a plurality (at least 50 or more) foam pieces.

There is no restriction | limiting in the manufacturing method of the said foam piece, A well-known method can be suitably selected according to the kind of resin. For example, when a chip-shaped foam piece is manufactured using a thermoplastic resin such as a polystyrene-based resin, it is preferable to manufacture the foam piece by the following method.
Supply the thermoplastic resin, the air conditioner, and, if necessary, the additive added to the extruder, heat, melt, knead, and then press-fit a blowing agent such as butane, pentane, carbon dioxide, etc. While kneading, the temperature of the molten resin is adjusted to obtain a foamable molten resin. The foamable molten resin thus obtained is extruded into water from a die in a cylindrical shape to form a foamable cylindrical resin, and when the foamable cylindrical resin is maintained in a softened state (about 100 ° C.), it is crushed by a nip roll to obtain a cross section. After making it oval, it is cut with a cutter at right angles to the extrusion direction to obtain a foamable chip having an oval cross section. If this foamable chip is foamed with water vapor, a chip-shaped foam piece can be obtained.
In this specification, the chip shape means a shape in which the disk is twisted, such as a circular, elliptical, polygonal disk or bowl.

In addition, when manufacturing a cylindrical particle-shaped foam piece using a thermoplastic resin, it is preferable to manufacture a foam piece by the following methods, for example.
The thermoplastic resin is heated and melted in an extruder together with additives such as inorganic substances such as talc, calcium carbonate, borax, aluminum hydroxide, etc., extruded and cooled from a die having a cross-sectional shape of a cylindrical molten resin extrusion port, Non-foamed cylindrical resin particles are produced by cutting to a certain length. Next, the cylindrical resin particles are placed in a closed container such as an autoclave together with a physical foaming agent and water, dispersed in water, heated to a temperature equal to or higher than the softening temperature of the resin particles, and impregnated with the foaming agent. After that, the pressure in the container is maintained at a pressure equal to or higher than the vapor pressure of the foaming agent, and once under the water surface in the container is opened, the softened resin particles and water are simultaneously at a lower pressure than in the container. By discharging downward, a cylindrical particle-like foam piece is obtained.

  The foam piece assembly is formed by joining the foam pieces so as to have a void. There is no restriction | limiting in the method to couple | bond so that it may have a space | gap, According to the kind of resin, a well-known method can be selected suitably. For example, after filling a foam piece into a cavity of a mold, and then performing mold clamping, pressurized steam is introduced into the cavity to melt the individual surfaces of the foam pieces so that the foam pieces are A method of manufacturing a foam piece assembly having voids by fusing each other, or heating the foam pieces between the upper and lower belts running endlessly with pressurized steam, Examples of the method include a method for producing a foam piece assembly having voids by fusing.

  Although there is no restriction | limiting in particular in the shape and magnitude | size at the time of manufacture of a foam piece conjugate | bonded body, it is preferable that it is cut into plate shape at the time of use, ie, at the time of formation of the drainage material layer 4, and the dimension is 50- length. The width is 200 cm, the width is 100 to 200 cm, and the thickness is 50 to 200 mm. The vertical and horizontal dimensions are preferably the above dimensions from the viewpoints of handleability, workability, etc., and the thickness is from the viewpoints of water permeability, strength, and followability (flexibility) to ground undulations. It is necessary to be a dimension, and the thickness is preferably 70 to 180 mm, more preferably 80 to 150 mm. The thickness of the foam piece assembly is preferably thick from the viewpoint of the water permeability of the drainage material layer of the inclined land widening structure, but if the compressive strength of the drainage material layer is insufficient, foaming is performed. One of the factors is that the thickness of the combined body piece is one of the factors, which leads to cracks and depressions in the covering portion of the structure.

Moreover, the water permeability coefficient of the foam piece assembly is 0.1 cm / sec or more, preferably 0.2 to 5 cm / sec, and more preferably 0.2 to 3 cm / sec. When the water permeability coefficient is less than 0.1 cm / sec, the drainage function cannot be sufficiently performed when the rain falls heavily, and the earth pressure may increase and the foamed synthetic resin block layer may be collapsed. Moreover, by adopting the foam piece combined body having the water permeability coefficient, sufficient drainage can be exhibited while being a thin one having a thickness of 50 to 200 mm, and the increase in earth pressure during the above-mentioned severe rain can be reduced. Furthermore, the drainage performance is satisfactorily expressed in the steep slope portion exceeding 45 degrees. That is, the drainage ability of the foam piece assembly has different drainage performance depending on the construction angle, and the higher the slope construction, the higher the drainage performance. Therefore, even if a thin foam piece assembly is used, a sufficient amount of water permeability can be secured, and there is no occurrence of cracks or depressions in the covering portion of the structure as described above.
The water permeability coefficient can be adjusted by the type of thermoplastic resin constituting the foam piece assembly, the porosity of the foam piece assembly, the shape of the foam piece, and the size of the foam piece. Moreover, the said hydraulic conductivity in this specification is a value measured by a water level permeability test according to JIS A 1218 (1993), replacing the sand as a sample with a foam piece assembly.

Moreover, the compressive strength of a foam piece conjugate | bonded_body is 30-300 kPa, Preferably it is 30-250 kPa, More preferably, it is 40-200 kPa. When the compressive strength is less than 30 kPa, the foam piece assembly may be damaged by earth pressure. On the other hand, when the compressive strength exceeds 300 kPa, the flexibility is lost and the construction following the ups and downs of the natural ground becomes impossible, and the one with a high compressive strength has a large apparent density of the foam piece combination or a void. Since the rate tends to be small, the upper limit of the compressive strength is 300 kPa. The compressive strength of the foam piece assembly used as the drainage material layer 3 is particularly preferably equal to the compressive strength of the foamed synthetic resin block 5 constituting the foamed synthetic resin block layer 6. As a result, the covering portion 8 formed above the foamed synthetic resin block layer 6 does not sink or rise at the drainage material layer 3 portion. This compressive strength can be adjusted by the apparent density, porosity, foam piece shape, and foam piece size of the foam piece assembly.
In addition, the said compressive strength in this specification is a value measured as 5% compressive strength calculated | required based on JISK7220 (1999).

In addition, the porosity of the foam piece assembly is preferably 10 to 50%, more preferably 15 to 40%, and particularly preferably 20 to 35%, in view of the balance between the compressive strength and the water permeability. It is.
In addition, the porosity (A) in this specification is calculated by the following formula.

A (%) = [(BC) / B] × 100

However, B is the apparent volume (cm ³ ) of the foam piece assembly, and C is the true volume (cm ³ ) of the foam piece assembly. The apparent volume B is the volume of the foam piece assembly calculated from the outer dimensions of the foam piece assembly, and the apparent volume includes the volume of the void. The true volume C is a volume obtained by subtracting the void volume from the apparent volume of the foam piece assembly. The true volume C can be obtained by measuring the increased volume when the foam piece assembly is submerged in a liquid (for example, water).

Moreover, the apparent density of the foam piece assembly is preferably 10 to 50 kg / m ³ , more preferably 12 to 30 kg / m ³ , and still more preferably 12 to 20 kg / m ³ . When the apparent density is less than 10 kg / m ³ , there is a risk that the foam piece assembly is damaged due to a decrease in mechanical strength, particularly compressive strength, and the inclined land widening structure is depressed. On the other hand, when the apparent density exceeds 50 kg / m ³ , it is too heavy, the workability is deteriorated, and the earth pressure may be increased.

  In the inclined land widening structure according to the present invention, the drainage material layer 4 is constructed using the above-described foam piece assembly. In the construction, the plate-like foam piece assembly described above is pressed so as to follow the undulations (unevenness) of the natural ground 2, and in close contact with the surface of the water-permeable material 3 attached to the natural ground, It is carried out by laying down along the inclined surface 2A of the mountain 2 in the vertical and horizontal directions without any gaps. At this time, since the foam piece assembly used in the present invention is designed to be light and easy to handle as described above, and has an appropriate flexibility, this work should be performed relatively easily. Can do. The drainage material layer 4 constructed in this manner is in close contact with the inclined surface 2A of the natural ground 2 and is supported by a high contact resistance, so that slip does not easily occur. Further, the water permeability coefficient is 0.1 cm / sec or more, the compressive strength is 30 to 300 kPa, and the thickness is 50 to 200 mm.

A foamed synthetic resin block layer 6 formed by laying and laminating a plurality of foamed synthetic resin blocks 5 is constructed on the surface side of the drainage material layer 4. The foamed synthetic resin block layer 6 includes, for example, a foamed synthetic resin block 5A for the main construction part that forms the interior, and a foamed synthetic resin block 5B for the exterior construction part that forms the wall surface on the opposite side (surface side) from the natural ground 2. And can be built by
The foamed synthetic resin block 5A for the main construction part and the foamed synthetic resin block 5B for the exterior construction part are stacked one by one to form the foamed synthetic resin block layer 6, but when the depth of the slope is small, The plurality of stages including the lowermost stage may be configured only with the foamed synthetic resin block 5B for the exterior construction part.

As the resin constituting the foamed synthetic resin block 5A for the main construction part and the foamed synthetic resin block 5B for the exterior construction part, for example, a foamed resin such as polystyrene, polyethylene, polypropylene, polyurethane, polyvinyl chloride or the like is used. Among them, polystyrene is most preferable because it is inexpensive and has high strength even at low density. Further, foamed synthetic resin block 5A, 5B apparent density of, preferably from the viewpoint of light weight and compression strength was 10 to 50 kg / m ^3, more preferably from 12~30kg / m ^3. The compressive strength is preferably 30 to 300 kPa, more preferably 30 to 250 kPa, and particularly preferably 40 to 200 kPa.

  The foamed synthetic resin blocks 5A and 5B can use a foamed synthetic resin bonded body formed by foam-molding the resin by a known method, and particularly formed by an extrusion molding method having excellent water resistance. It is preferable that it is formed by a foamed particle in-mold molding method capable of integrally molding a foamed synthetic resin block having a large thickness. In addition, the foamed synthetic resin bonded body formed by the extrusion molding method has a small thickness. Therefore, it may be used that is laminated and integrated by bonding multiple sheets. The one obtained is regarded as one foamed synthetic resin block.

  The size of the foamed synthetic resin block 5A for the main building portion is, for example, a rectangular parallelepiped shape in which L1 × L2 × L3 shown in FIG. 2 is 100 to 200 cm × 50 to 200 cm × 10 to 100 cm. The resin block 5B has, for example, a rectangular parallelepiped shape in which L4 × L5 × L6 is 50 to 200 cm × 50 to 200 cm × 10 to 100 cm (however, L2 = L5, L3 = L6).

  A protective plate 10 is attached to the end surface of the foamed synthetic resin block 5B for the exterior construction part. As for the size of the protective plate 10, for example, L7 × L8 × L9 is (L5-10 mm) × (L6-10 mm) × 10-30 mm.

The protection plate 10 can be formed of various hydraulic cements such as concrete and mortar. As hydraulic cement, Portland cement such as ordinary Portland cement, medium-range Portland cement, early strength Portland cement, low sulfate Portland cement, white Portland cement, hydraulic lime, Roman cement, natural cement, alumina cement, blast furnace cement, There are silica cement, expanded cement, and colored cement. Of these, portland cement, hydraulic lime, natural cement, blast furnace cement, expanded cement, and colored cement are preferably used.
Further, various aggregates, reinforcing materials, weight-reducing materials, water glass, and the like can be added to the protective plate 10 to the cement.

  The protection plate 10 and the foamed synthetic resin block 5 are integrated with each other by placing the pre-formed foamed synthetic resin block 5 in a mold and pouring uncured cement mortar into a desired shape from above. The protective plate 10 is formed by curing, or conversely, the foamed synthetic resin block 5 is placed on a cement mortar placed in a predetermined amount in a mold, and cured and cured to form the protective plate 10. This is achieved by separately preparing the foamed synthetic resin block 5 and the protective plate 10 and bonding them using an adhesive. In that case, at least one groove is formed in advance on the surface of the foamed synthetic resin block 5, the groove is turned upward and placed in a mold, and uncured cement mortar is poured from above to cure and harden. Thus, it is preferable to form the protective plate 10 and to form a ridge which is a part of the protective plate 10 in the groove. It is preferable that the groove and the protrusion are formed so as to be ant-coupled to each other, because the joint between the foamed synthetic resin block 5 and the protective plate 10 becomes stronger. Further, the foamed synthetic resin block 5 and the protective plate 10 having a ridge formed on the back surface can be separately produced and bonded together with an adhesive or the like.

For example, the foamed synthetic resin block layer 6 shown in FIG. 1 is constructed as follows using the above-described foamed synthetic resin block 5A for the main construction part and the foamed synthetic resin block 5B for the exterior construction part.
First, the earth and sand of the flat ground 11 connected to the inclined surface 2A of the natural ground 2 is shaved or piled up on the flat ground 11 and then laid with sand and gravel, solidified, and then the foundation 12 is formed by placing concrete thereon. To do. At that time, an appropriate number of reinforcing bars 13 are planted on the foundation 12.
Next, on the foundation 12, the foamed synthetic resin block 5B for exterior construction part is stacked so that the protective plate 10 is located outside at the site forming the outer surface, and the protective plate is not provided behind it. The foamed synthetic resin blocks 5A for parts are stacked, and the foamed synthetic resin block layer 6 having a predetermined height (9 levels in the illustrated embodiment) is constructed.
When stacking the foamed synthetic resin blocks 5A and 5B, the butted portions of the upper and lower blocks are stacked so that the butted portions of the blocks do not penetrate from the lowest level to the uppermost level. Further, during the above laminating operation, the pins 14 are inserted into the stacked upper and lower foamed synthetic resin blocks to bond the upper and lower foamed synthetic resin blocks to each other. If the pin 14 is inserted into at least the foamed synthetic resin block 5B for the exterior construction part, it is possible to prevent the foam synthetic resin block 5B for the exterior construction part from being displaced, so that the protection plate 10 is prevented from being undulated, It is preferable because the appearance can be maintained well. Needless to say, the pin 14 may be inserted into the foamed synthetic resin block 5A for the main building part that constitutes the inside, in addition to the foamed synthetic resin block 5B for the exterior building part.
Further, as shown in FIG. 1, in order to make the upper surface of the laminated synthetic resin blocks 5A and 5B uniform and to make the load from above uniform, the laminated synthetic resin blocks 5A and 5B are in the middle of lamination. It is preferable to laminate the concrete plate 15. The concrete plate 15 is preferably provided in one layer on the foamed synthetic resin block 200 to 300 cm, and the thickness is about 10 to 30 cm.

In the inclined land widening structure 1 according to the present invention, a filling material 7 is filled between the foamed synthetic resin block layer 6 constructed as described above and the drainage material layer 4. As this interlining material 7, from the viewpoints of lightness and strength (compressive strength), and further, workability and economy, end materials such as cut products of the foam piece assembly forming the drainage material layer 4 are used. Preferably used.
Since the foamed synthetic resin block 5 for constructing the foamed synthetic resin block layer 6 is a rectangular parallelepiped, as described above, the foamed synthetic resin block 5 is formed from the foam piece assembly attached along the inclined surface 2A of the natural ground 2. As shown in FIG. 1 and the like, a space portion having a triangular cross section is formed in a reverse staircase shape between the drainage material layer 4. It is conceivable to cut the end of the foamed synthetic resin block 5 arranged on the inclined surface 2A side at the same angle as the inclined angle of the inclined surface 2A (drainage material layer 4) so that such a space portion is not formed. In this case, it is essential to cut the foamed synthetic resin block 5 at the site, and this work becomes a large and difficult work because the foamed synthetic resin block 5 is large, and the loss rate of the foamed synthetic resin block 5 is improved. . Therefore, in the present invention, a space is allowed to be formed between the drainage material layer 4 and the foamed synthetic resin block layer 6, and the space 7 is filled with the filling material 7. The interlining material 7 is required to be lightweight from the viewpoint of reducing earth pressure, and also required to have compressive strength from the viewpoint of avoiding the depression of the covering portion 9 formed above. A material having both lightness and strength (compressive strength) may be prepared separately and filled as a filling material 7 between the drainage material layer 4 and the foamed synthetic resin block layer 6. As a preferable aspect, the end material of the foam piece assembly that forms the drainage material layer 4 as described above is used.

  For example, as shown in FIG. 3, the filling operation of the filling material 7 is sequentially performed from below. That is, the water-permeable material 3 and the drainage material layer 4 are first formed to an appropriate height along the inclined surface 2A of the natural ground 2, and the foamed synthetic resin block 5 is placed on the surface side (front side). Then, the foam piece combined body for forming the drainage material layer 4 as the interlining material 7 in the space formed between the rear end surface of the placed foamed synthetic resin block 5 and the drainage material layer 4 is appropriately used. It cuts and fills in size, fills the space, and makes the upper end flush with the upper surface of the foamed synthetic resin block 5. Subsequently, the second-stage foamed synthetic resin block 5 is placed thereon, and the drainage material layer 4 is similarly applied to the space between the rear end surface of the foamed synthetic resin block 5 and the drainage material layer 4. The end material of the foam piece assembly to be formed is filled as a filling material 7. By repeating the above operation, as shown in FIG. 4, between the foamed synthetic resin block layer 6 and the drainage material layer 4, it is composed of the end material of the foam piece assembly that forms the drainage material layer 4. A structure filled with the filling material 7 is constructed. The filling operation of the filling material 7 does not require a separate filling material to use the foam piece assembly for forming the drainage material layer 4, and the foam piece assembly for forming the drainage material layer 4 is It is a material that combines lightness and strength (compressive strength), and since it has a thin plate thickness, it can be easily cut, and foam generated during the formation of the drainage material layer 4 Since the waste material of a single joined body can also be used, it becomes excellent in workability and economical efficiency.

In order to ensure drainage from the drainage material layer 4 formed between the sloped surface 2A of the natural ground 2 and the foamed synthetic resin block layer 6, the sloped land widening structure 1 according to the present invention is drained. A drain pipe 8 communicating with the material layer 4 is provided. The drain pipe 8 is preferably made of a synthetic resin pipe, such as a vinyl chloride pipe, from the viewpoints of lightness and strength, and workability.
For example, as shown in FIG. 3, the drainage pipe 8 includes a drainage pipe 8 a having a plurality of holes 16 formed in the peripheral wall along the lower end of the drainage material layer 4 and, if necessary, drainage material at an appropriate height position. 1 is arranged along the layer 4 (along the lower end and the middle position of the drainage material layer 4 in the embodiment shown in FIG. 1), and the water flowing into the water collecting pipe 8a is supplied to the structure through the branch pipe 8b. It is configured to drain to the outside.

  Further, in the inclined land widening structure 1 according to the present invention, the covering portion 9 is formed above the constructed foamed synthetic resin block layer 6. The covering portion 9 functions as, for example, a road surface, and a person can move or the vehicle can travel on the covering portion 9. Examples of the material of the covering portion 9 include asphalt, concrete, gravel, earth and sand, earth, and tile. Moreover, the coating | coated part 9 can also be formed not only in a single layer but in multiple layers.

  The inclined land widening structure 1 according to the present invention constructed as described above is between the foamed synthetic resin block layer 6 formed by laying and laminating the foamed synthetic resin block 5 and the inclined surface 2 </ b> A composed of the natural ground 2. In addition, since the structure is formed with the drainage material layer 4 excellent in light weight, drainage and slip resistance, it is excellent in the earth pressure reduction effect which is a problem in the widened structure on the slope, and the earth pressure even if it rains heavily Can be effectively suppressed, and a highly safe sloped land widening structure can be constructed even on a slope having a steep slope, for example, a slope exceeding 45 degrees. In addition, in order to have an excellent earth pressure reduction effect, it is possible to simplify the retaining wall composed of H rope piles, etc., and also to design without a retaining wall. By laminating the resin block 5B on the portion forming the outer surface, it is possible to construct a sloped land widening structure having a highly reliable wall surface, and to provide a sloped ground widening structure that is advantageous in terms of workability and economy. it can. Of course, from the viewpoint of high safety, a structure having a retaining wall can be used.

  Moreover, in the above-mentioned inclined land widening structure 1, the end material of the foam piece combination body which forms the drainage material layer 4 as the padding material 7 between the foaming synthetic resin block layer 6 and the said drainage material layer 4 is used. Since it is filled, it is lightweight and has sufficient strength, and deformation and depression of the covering portion 9 constructed above can be prevented. Further, since the foam piece assembly for forming the drainage material layer 4 is used, it is not necessary to prepare a separate filling material, and the foam piece assembly for forming the drainage material layer 4 is thin. Therefore, the cutting can be easily performed, and further, the waste material of the foam piece assembly generated at the time of forming the drainage material layer 4 can be used, so that it is excellent in workability and economical efficiency. .

  The preferred embodiment of the inclined land widening structure according to the present invention has been described above, but the present invention is not limited to the described embodiment, and the technology of the present invention described in the claims. It is a matter of course that various modifications and changes can be made within the scope of the spirit.

It is a notional longitudinal sectional view showing a preferred embodiment of an inclined land widening structure according to the present invention. It is the conceptual perspective view which showed suitable embodiment of the foaming synthetic resin block used in the inclined land widening structure which concerns on this invention. It is the conceptual perspective view which showed suitable embodiment in the middle of construction of the inclined land widening structure which concerns on this invention. 1 is a conceptual partial longitudinal sectional view showing a preferred embodiment of an inclined land widening structure according to the present invention. It is the conceptual longitudinal cross-sectional view which showed an example of the conventional sloping ground widening structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sloping widening structure 2 Ground mountain 2A Inclined surface 3 Water permeable material 4 Drainage material layer 5 Foam synthetic resin block 5A Foam synthetic resin block for main construction part 5B Foam synthetic resin block for exterior construction part 6 Foam synthetic resin block layer 7 Filling Material 8 Drain pipe 8a Water collecting pipe 8b Branch pipe 9 Covering part 10 Protection plate 11 Flat ground 12 Foundation 13 Rebar 14 Pin 15 Concrete board 16 Hole

Claims (3)

  A water permeable material provided along an inclined surface composed of natural ground, a water permeability coefficient formed on the surface of the water permeable material of 0.1 cm / sec or more, a compressive strength of 30 to 300 kPa, and a thickness of 50 to 200 mm. A foamed synthetic resin block layer formed by laying and laminating a plurality of foamed synthetic resin blocks constructed on the surface side of the drainage material layer, and the foamed synthetic resin block layer. A filling material filled between the drainage material layer, a drainage pipe communicated with the drainage material layer, and a covering portion formed above the foamed synthetic resin block layer. Characterized by a widened structure on an inclined land.   The inclined land widening structure according to claim 1, wherein the padding material is an end material of a foam piece assembly that forms the drainage material layer.   The inclined land widening structure according to claim 1 or 2, wherein the inclined surface formed of the natural ground has an inclined surface portion having a gradient exceeding 45 degrees.

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