JP2007308882A - Lightweight embankment structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight embankment structure capable of sufficiently exerting an effect of reduction in weight by a foamed resin block and the simplification of construction. <P>SOLUTION: This lightweight embankment structure 1 comprises: an exterior wall 11; an embankment 9 in which a plurality of foamed synthetic-resin blocks 8 are laid and stacked on the backside thereof; and a back-filling material 12 which is infilled between the inclined surface-side end surface 8b of the block 8 and an inclined surface 5. In the lightweight embankment structure 1, the mass per unit area of the exterior wall 11 is 0.5 kN/m<SP>2</SP>or smaller, and the back-filling material 12 is composed of foamed waste glass with a volume density of 2-10 kN/m<SP>3</SP>. Since the weight of the exterior wall 11 can be reduced by supporting a wall material by means of a simple support without the need for a heavy support such as H-shaped steel, the size of a concrete foundation for supporting the embankment structure can be reduced. Additionally, the size and weight of the whole embankment structure are reduced so that a burden on the natural ground can be reduced, the stable embankment structure can be constructed; work in a narrow place can be easily performed by virtue of the unnecessity of the use of large-sized heavy equipment during construction, and the small excavation cross-section of the natural ground can make a construction period shorter than before and make construction cost lower than before. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lightweight embankment structure using a foamed synthetic resin block (hereinafter referred to as a foamed resin block), and more specifically, for example, in the construction of roads, railways, land, etc. on sloped land, and in the widening work thereof. The present invention relates to a lightweight embankment constructed with a foamed resin block as a main structure.

  As a lightweight embankment method for building roads on slopes and widening roads and parking spaces, etc. on slopes, the slopes of mountains are shaved to form a substantially horizontal support ground, and the concrete foundation is formed on the support ground. A wall made of H-shaped steel or the like is erected on the concrete foundation at an appropriate interval, and a wall material that provides weather resistance, such as an extruded cement board, is fixed to the outer surface side of the column to hold the wall. A light-weight embankment structure in which foamed resin blocks are stacked between the retaining wall portion and the inclined surface on the mountain side is becoming widespread in place of embankment using conventional soil.

  However, in the conventional lightweight embankment structure using the foamed resin block, it is necessary to use a large heavy machine in order to perform the construction of the pillar made of H-shaped steel or the like on the foundation, the mounting work of the wall material to the pillar, There were many problems, such as the need for a large construction yard and the need to block the road for a long time. Therefore, a heavy column made of H-shaped steel or the like is not used, and a foamed resin block with a wall material with a wall material attached to the side surface on the outer side of the embankment (the valley side on the inclined surface) is placed on the outer side (the valley). A lightweight embankment structure has been proposed in which the retaining wall is constructed by stacking the side walls, and the embankment is constructed by stacking foam resin blocks with no wall material attached to the inner side of the embankment (the mountain side on the inclined surface). (See Patent Documents 1 and 2.)

  In the light-weight embankment structure using the foamed resin block in the inclined land as described above, an inverted triangular shape is usually formed between the inclined surface side (mountain side) end surface and the inclined surface of the foamed resin block of each step stacked on the embankment part. There is a gap. Conventionally, this gap has been filled with crushed stone as a backfill material. However, crushed stone has a large specific gravity and a large horizontal earth pressure against the foamed resin block in the embankment part. Therefore, it does not use a solid support such as H-shaped steel, but the lightweight wall is made up of a foamed resin block with wall material attached. In the embankment structure, when the embankment part is constructed by laying a foam resin block and filling crushed stone as a backfill material, the foam resin block with a low specific gravity is pushed laterally by the horizontal earth pressure by the crushed stone to the wall surface side. There is a problem that the wall surface is displaced to the valley side. For this reason, even if it is an embankment structure using a light foamed resin block, the retaining wall part is a strong but heavy structure with H-shaped steel as a support, and the backfill material is also made of crushed stone with a large specific gravity Because it is used, the weight of the whole embankment structure becomes large, and in order to support the weight of these embankment structures, it is necessary to make a large excavation cross section and also to construct a large concrete foundation, the weight of the embankment increases more and more, It is hard to say that the effect of using a lightweight foamed resin block is sufficiently exhibited.

  On the other hand, as a backfill material for lightweight embankment structures using foamed resin blocks on sloping ground, a retaining wall structure using a synthetic resin granular material obtained by grinding a volume-reduced product of waste foamed synthetic resin such as polystyrene resin and its construction method are proposed. (See Patent Document 3). This synthetic resin granular material is lighter than crushed stone, and the load on the retaining wall surface is reduced. However, there are various types of foamed synthetic resin products to be recovered, and various resins are mixed. Therefore, the volume of waste foamed synthetic resin is reduced, and the pulverized synthetic resin granules are uneven in hardness, shape, size, etc., quality and characteristics are not stable, and supply amount is not stable. The necessary amount may not be secured during construction. Furthermore, although the synthetic resin granules made of the recovered foamed synthetic resin product are light in weight, the hardness, shape, size, etc. are not uniform as described above, so the internal friction angle is not stable, and self-supporting properties cannot be secured. Sometimes. However, when the internal friction angle is small, the load (horizontal earth pressure) on the foamed resin block and also the retaining wall is not always sufficiently smaller than that of conventional crushed stones when rolling to compact the backfill material. Absent. For this reason, the retaining wall structure employs a rigid retaining wall structure in which a wall material made of precast concrete (PC) or the like is held by a support made of H-shaped steel or the like, and a foamed resin in which the wall material is integrally attached. It is not adopted for lightweight and simple construction using blocks.

  In addition, instead of filling the backfill material, it has been proposed to form the end face of the foamed resin block on the inclined surface side in a triangular shape corresponding to the shape of the inclined surface (see Patent Documents 4 and 5). However, it is difficult to form an inclined surface as designed at the construction site, and it is also very difficult and time-consuming to form a foamed resin block according to the shape of the inclined surface, which is not practical. .

  Furthermore, in order to improve the stability of the lightweight embankment constructed by using the foamed resin block on the sloping ground, a lightweight embankment structure using a high-strength block near the laminated bottom where the embankment stress is concentrated has been proposed (see Patent Document 6). ). However, when a high-strength block is used, it takes time to sort the other blocks at the time of construction, and the material cost is high, and the construction cost is high.

  In addition, a lightweight embankment method has been proposed in which foamed waste glass material is embanked and rolled to reduce the internal friction angle to 30 ° or more (Patent Document 7). However, in this lightweight embankment method, the foamed waste glass is granular, so when used alone, this earth pressure requires a similar retaining wall (earth retaining) as well as normal earth pressure. Become.

Japanese Utility Model Publication 4-119512 Japanese Patent Laid-Open No. 11-140877 JP-A-11-1000084 JP 11-172680 A JP 2005-97892 A JP 2000-282470 A JP 2001-193071 A

  The present invention provides a lightweight embankment structure that can sufficiently exhibit the effects of weight reduction and simplification of construction by using a foam resin block in view of the above problems in a lightweight embankment structure using a foam resin block. The purpose is to do.

A lightweight embankment structure according to the present invention includes an outer wall portion, a embankment portion formed by laying and laminating a plurality of foamed resin blocks on the back side of the outer wall portion, an inclined surface side end surface and an inclined surface of the foamed resin block. In the lightweight embankment structure composed of a backfilling material filled between the outer wall portions, the surface density of the outer wall portion is 0.5 kN / m ² or less, more preferably 0.35 kN / m ² or less, and the backfilling The material is a porous granular material having a bulk density obtained by firing and foaming waste glass within a range of 2 to 10 kN / m ³ , more preferably within a range of 2 to 8 kN / m ³ . In the present invention, the surface density of the outer wall portion means the total weight per unit area (1 square meter) of the wall material constituting the outer wall portion, and the structural material such as a column and a fixture for fixing the wall material, that is, a unit. The area density refers to the bulk density of the backfill material, and the total density per unit volume (1 cubic meter) of the backfill material filled between the inclined surface side end surface and the inclined surface of the foamed resin block, that is, Unit volume weight.

  It is preferable that the internal friction angle of the back-filling material made of the porous granular material obtained by firing and foaming the waste glass is 30 ° or more.

  Moreover, it is preferable that the said outer wall part consists of a wall material integrally fixed to the foamed resin block which comprises the embankment part located in the back surface of this outer wall part.

  The embankment structure on the inclined surface is often constructed in mountainous areas, but according to the lightweight embankment structure using the foam resin block according to the present invention, not only the foam resin block that is the main component of the embankment structure, The backfilling material filled in the gap between the inclined surface side end surface of the foamed resin block constituting the outer wall portion and the embankment portion and the inclined surface is also lightweight. For this reason, it is not necessary to use a heavy column such as H-shaped steel as in the conventional case, and the wall material can be supported by a simple column and the outer wall portion can be reduced in weight. Furthermore, if the internal friction angle of the backfill material is 30 ° or more, the horizontal earth pressure of the backfill material against the foamed resin block is further reduced, and the foamed resin block is displaced laterally when the backfill material is rolled. Can be prevented, and a stable embankment structure can be constructed. Therefore, the excavation cross section of the natural ground is small and the concrete foundation supporting the embankment structure is small, the entire embankment structure is reduced in size and weight, the burden on the natural ground is reduced, and a stable embankment structure can be constructed. In addition, it is not necessary to use a large heavy machine at the time of construction, work in a narrow place is easy, and the excavation cross section of the natural ground is small, so the construction period can be shortened and the construction cost can be reduced.

  If the outer wall portion is formed of a wall material integrally fixed to a foamed resin block constituting the embankment portion located on the back surface of the outer wall portion, a column for constructing the outer wall portion becomes unnecessary, and the outer wall portion is further improved. The weight can be reduced, the concrete foundation can be made smaller or unnecessary, and the weight of the entire embankment is further reduced.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a lightweight embankment structure according to the present invention, and FIG. 2 is a transverse sectional view of an essential part. This lightweight embankment structure 1 is a widening embankment constructed on a supporting ground 3 formed by excavating an inclined surface 2 of a natural ground. In the lightweight embankment structure 1, a concrete foundation 6 is constructed on the valley side of the bottom horizontal surface 4 of the supporting ground 3, a pillar P is erected on the valley side on the concrete foundation 6, and a mountain side 8 (supporting ground on the concrete foundation 6). 3), a base material 7 such as crushed stone is laid. A wall material 10 composed of a plurality of extruded cement plates or the like is provided in the height direction of the support pillar P standing on the concrete foundation 6 by means of a fixture 19 between the adjacent support pillars P and P as shown in FIG. The outer wall portion 11 is constructed by being fixed. Further, on the back side (the inclined surface 5 side) of the outer wall portion 11, the embedding portion 9 is constructed by stacking and laying the foamed resin blocks 8 in a plurality of stages. Further, waste glass is baked as a backfill material 12 in a substantially inverted triangular gap formed between the foamed resin block 8 and the inclined surface 5 located on the inclined surface 5 side in the embankment portion 9. Filled with foamed waste glass, which is a foamed porous granular material. Further, a concrete floor slab 13 is constructed on the upper surface of the embankment portion 9, and a roadbed 14 is further constructed on the valley side portion on the concrete floor slab 13. 15 (floor, pavement, etc.) is laid flush with the conventional road surface 15A.

  A construction method of the lightweight embankment structure 1 will be described. First, as shown in FIG. 1, the support ground 3 is constructed by excavating the inclined surface 2 of the natural ground, and the concrete foundation 6 is placed at a position from the valley of the lower end horizontal surface 4 of the support ground 3 and filled with crushed stones and the like. Then, the base material 7 is laid, the support P is erected, and the lowermost wall material 10 is attached by the fixing bracket 19. The lowermost foam resin block 8 is laid on the back side of the wall material 10, and the foamed waste glass is filled between the inclined surface side end surface 8 b and the inclined surface 5 as the backfill material 12, and is pressed and tightened. Solidify.

  As described above, the mounting of the wall material 10, the laying of the foamed resin block 8, the laying of the backfill material 12, and the rolling pressure are repeated, and the wall material 10 is made substantially vertical along the vicinity of the end of the support ground 3 on the valley side. In addition to constructing the outer wall portion 11, the foamed resin blocks 8 are sequentially piled up in a staggered manner in the left-right direction and the front-rear direction to the set height, and the embankment portion 9 is constructed. Thereafter, a concrete floor slab 13 manufactured at a factory or the like is laid on the upper surface of the uppermost foamed resin block 8, and an upper soil 15 such as a roadbed 14, a roadbed, and a pavement is laid on the concrete floor slab 1. Build up. The concrete floor slab 13 may be constructed by assembling a mold on the upper side of the uppermost foamed resin block 8 and placing concrete there. Further, as shown in FIG. 1, an intermediate concrete floor slab 18 may be provided at an intermediate height in the embankment portion 9.

  In the light weight embankment structure 1 of the present invention as described above, waste glass is a main component as a backfilling material filled between the inclined surface side end surface 8b and the inclined surface 5 of the foamed resin block 8 constituting the embankment portion 9. It is characteristic to use the foamed waste glass. As this foaming waste glass, what was disclosed by Unexamined-Japanese-Patent No. 2001-193071, for example is mentioned. This foamed waste glass is, for example, a recycled product of glass waste materials such as empty bottles, and is obtained by crushing, pulverizing, firing and foaming collected waste glass such as empty bottles. Registered trademark), Miracle Sol (registered trademark) of Nippon Construction Technology Co., Ltd., Next One (trade name) of Soil Engineering Shikoku Co., Ltd. can be used. Foamed waste glass has little variation in quality and characteristics like the waste foamed synthetic resin granules, and the supply amount is stable nationwide, making it easy to secure the amount required for banking construction in any region. It can also contribute to the solution of waste glass processing problems. Furthermore, by using the above-mentioned foamed waste glass as a backfill material, it functions as a drainage layer, and there is no need to provide a separate drainage layer.

  Furthermore, if a sandbag filled with the foamed waste glass is used as the backfilling material 12, it can be handled and carried easily, and the backfilling material 12 can be filled easily. Further, if the sandbag bag has water permeability, a drainage layer is formed between the foamed resin block 8 and the inclined surface 5 by the sandbag bag. Examples of the permeable bag include woven fabric and non-woven fabric, and the material may be any natural fiber such as hemp or synthetic fiber.

  The size of the foamed resin block 8 constituting the embankment portion 9 is not particularly limited, but for example, a rectangular parallelepiped block having a length of 2 m, a width of 1 m, and a height of 0.5 m is basically used, and the block is cut as it is or to a required length. As shown in FIG. 1, the foamed resin blocks 8 arranged vertically are shifted in the front-rear direction and the left-right direction toward the inclined surface 5 of the support ground 3 and stacked in a staggered manner. The foamed resin block 8 having such a size has, for example, a weight of 12 kg to 30 kg, and is easy to carry and excellent in workability. As the material of the foamed resin block 8, a synthetic resin such as a polystyrene resin, a polyurethane resin, or a polyvinyl chloride resin can be used. Among these, a polystyrene resin foam such as polystyrene is used from the viewpoint of strength and price. A body block is preferred.

Moreover, as the wall material 10 which comprises the outer wall part 11, although a metal plate, a synthetic resin board, a hydraulic binder etc. can be employ | adopted, when considering using it as the outer wall part 11 of the embankment structure 1, environmental resistance and carrying around It is preferable to use a ceramic-type exterior material such as an extrusion-molded cement board that is excellent in properties and workability. The thickness of the wall material 10 is not limited, but if it is too large, not only the portability and workability will deteriorate, but also the surface density of the outer wall 11 will exceed 0.5 kN / m ^2, and the weight of the entire embankment structure 1 will be reduced. The object of the present invention may not be achieved. The thickness and weight of the wall material 10 are more preferably set so that the surface density of the outer wall portion 11 is 0.35 kN / m ² or less. On the other hand, if the thickness of the wall member 10 is too thin, sufficient strength and rigidity of the outer wall portion 11 cannot be obtained. For this reason, when the wall material 10 is made of a ceramic-type exterior material, the thickness is preferably about 5 mm to 50 mm.

Next, what is shown in FIG. 3 is a longitudinal sectional view showing a second embodiment of the lightweight embankment structure according to the present invention.
The lightweight embankment structure 1A of this embodiment is a widening embankment constructed on a support ground 3 formed by excavating the inclined surface 2 of the natural ground, as in the first embodiment. This lightweight embankment structure 1A includes a lightweight embankment structure 1 in which foamed resin blocks 8 are piled and laid on the top surface of the non-land surface adjustment sand or mortar layer 6 'laid on the lower end horizontal surface 4 of the support ground 3. The embankment part 9 which is a main structure is constructed. And in this embodiment, the wall material 10 is integrally fixed to the outer surface side (attachment surface) 8a of each step of the foamed resin block 8 arranged on the most valley side in the embankment portion 9 without using a support column. The outer wall portion 11 is constructed by the wall material 10 attached to the foamed resin block 8 of each stacked stage. On the other hand, in the inverted triangular space formed between each step of the foamed resin block 8 located on the inclined surface 5 side of the embankment portion 9 and the inclined surface 5 of the supporting ground 3, the foaming waste is the same as described above. Glass is filled as the backfill material 12. Moreover, a concrete floor slab 13 is constructed on the upper surface of the embankment portion 9, and a roadbed 14 is constructed on a valley side portion on the concrete floor slab 13, and an oversoil 15 is laid.

  This lightweight embankment structure 1A is constructed in the following manner, for example. First of all, excavation of the slope 2 of the mountain and construction of the supporting ground 3 are carried out. On the upper surface of the bottom horizontal surface 4 of the supporting ground 3, non-land adjustment sand and mortar layer 6 ′ are laid, and the foamed resin block 8 is installed. The surface is formed flat so as to be sure. Next, the foamed resin block 8 to which the wall material 10 is fixed is laid. Thereafter, a sandbag 12 as a backfilling material is filled between the inclined surface side end surface 8b and the inclined surface 5 of the foamed resin block 8, and pressed and compacted. In this way, the laying of the foamed resin block 8 and the laying of the sandbag 12 as the backfilling material and the rolling pressure are repeated, so that the wall material 10 is arranged substantially vertically along the vicinity of the end of the valley side of the supporting ground 3. The foamed resin block 8 with the wall material 10 attached and the foamed resin block 8 with no wall material attached are laid and stacked in a staggered manner in the left-right direction and the front-rear direction to the set height, On the front surface, the outer wall portion 11 is constructed by the wall material 10. Thereafter, the concrete floor slab 13 is laid and constructed on the upper surface of the uppermost foamed resin block 8, and the roadbed 14 and the road surface material 15 are constructed thereon to construct the lightweight embankment structure 1.

  In the lightweight embankment structure 1A in which the foamed resin blocks 8 to which the wall material 10 is attached are stacked to form the outer wall portion 11 as described above, the concrete foundation 6 for erecting the column supporting the wall material is unnecessary. Thus, the embankment structure 1A is further reduced in size and weight, and a stable embankment structure with a small burden on the natural ground can be constructed, while the construction period can be shortened and the construction cost can be reduced.

  The structure for fixing the wall material 10 to the foamed resin block 8 is not particularly limited. For example, the cement cured material layer (wall material 10) disclosed in Japanese Utility Model Laid-Open No. 4-119512 is opposite to the foamed resin block 8. A structure having a structure integrated with a taper-shaped joining means, disclosed in JP-A No. 11-140877, a pair of support members is attached to the foamed resin block 8 on the outer surface (mounting surface 8a) of the foamed resin block 8. On the other hand, it is embedded along the vertical direction in a state where it is prevented from coming off in the horizontal direction, the wall material 10 is butted against the side surface of the foamed resin block 8, the drill screw is screwed into each support member through the wall material 10, The thing of the structure which integrated the wall material 10 in the foamed resin block 8 is mentioned.

  Moreover, an example of the foamed resin block 8 in which the wall material 10 is integrally fixed by the fixture 16 is shown in FIGS. The fixture 16 is a U-shaped bent metal plate such as a stainless steel plate. The fixture 16 includes a fixing portion 21 disposed along the mounting surface 8a (front side) of the foamed resin block 8 and the foamed resin block 8. A connecting portion 22 arranged along the upper surface or the lower surface and an anchor portion 23 embedded in the foamed resin block 8 are provided. The fixing portion 21 is fixed to the foamed resin block 8 together with the wall material 10 by a stopper 17 such as a screw screw. Fix it. Any material can be used for the fixture 16 as long as it is easily deformed with the compression creep deformation of the foamed resin block 8 and the load due to the compression creep deformation of the foamed resin block 8 does not act on the wall material 10 as much as possible. In addition to the metal plate, an injection molded product made of a synthetic resin material may be used. The fixture 16 may be retrofitted to the prefabricated foamed resin block 8 at a factory or construction site, or is set in a mold when the foamed resin block 8 is molded, and is inserted integrally with the foamed resin block 8. You may shape | mold. In the case of insert molding, not only the anchor part 23 but also the connecting part 22 can be embedded in the foamed resin block 8.

  In the case of attaching to the foamed resin block, the wall material 10 is arranged at the top and bottom with at least the height dimension being slightly smaller than the height dimension of the wall material mounting surface 8a in the foamed resin block 8. It is preferable that the gaps be formed between the materials 10. Specifically, the height dimension of the wall material 10 is reduced by 1 to 5% with respect to the height dimension of the foam resin block 8, and the height dimension of the foam resin block 8 is 1 to 1 between the upper and lower wall materials 10. It is preferable to create a gap of 5% so that the upper and lower wall members 10 do not come into contact with each other even after compression creep deformation, or a large overload does not act even if contacted. Further, the mounting position in the height direction of the wall material 10 with respect to the mounting surface 8a of the foamed resin block 8 may be midway in the height direction of the mounting surface 8a so that the gap is allocated on both the upper and lower sides of the wall material 10. One of the upper edge and the lower edge of the wall material 10 may be set to the same height as one of the upper edge and the lower edge of the mounting surface 8a so that a gap 20 is formed below or above the material 10. In any case, it is preferable that a gap allowing the compression creep deformation of the foamed resin block 8 is formed between the wall members 10 arranged above and below.

  Although the dimension of the width direction of the wall material 10 may be the same as that of the foamed resin block 8, it is smaller than that by, for example, about 0.5 cm to 2.5 cm, and a gap extending in the vertical direction between the wall material 10 adjacent to the left and right Preferably formed and loaded with joint material. Further, as shown in FIG. 4A, one wall material 10 may be fixed so as to cover the entire surface surrounded by the lateral edges and the side edges in the height direction of the foamed resin block 8. As shown in FIG. 4B, a plurality of wall members 10 may be attached across the joints in the width direction.

  Further, as shown in FIG. 5, fitting portions 25 and 26 that can be fitted on the upper edge portion and the lower edge portion of the wall member 10 so as to overlap in the front-rear direction are formed, and the lower edge fitting of the upper wall member 10 is performed. A gap 20 that allows compression creep deformation of the foamed resin block 8 may be formed between the portion 25 and the upper edge fitting portion 26 of the lower wall member 10. Further, as shown by phantom lines in FIG. 5, as the foamed resin block 8 to which the wall material 10 is fixed, the mounting surface 8 a is configured as an arc surface that is recessed toward the substantially central portion in the height direction, and the foamed resin block 8 may be configured so that bending stress does not act on the wall material 10 so that the middle portion of the mounting surface 8a bulges outward by compressive creep deformation and the mounting surface 8a becomes a substantially vertical surface. Further, as shown in FIG. 5, a lower recess portion 27 is formed on the upper and lower surfaces of the foamed resin block 8 so as to correspond to the connecting portion 22 of the fixture 16, and the fixture 16 is attached to the recess portion 27 to foam. Even when the resin block 8 undergoes compressive creep deformation, a gap may be formed between the fixtures 16 disposed on the upper and lower foamed resin blocks 8. In this case, even when the fixtures 16 of the upper and lower foamed resin blocks 8 overlap each other, the fixtures 10 do not come into contact with each other, and the shear failure of the stopper 17 can be prevented. A recess is formed in the adjacent foam resin block 8 so as to correspond to the counterpart fixing tool 16 so that the fixing tool 16 does not come into contact with the adjacent foam resin block 8 so that a shearing force acts on the stopper 17. May be prevented.

  Next, FIG. 6 shows another embodiment of the structure for attaching the wall material 10 to the foamed resin block 8. This embodiment has the same configuration as the embodiment shown in FIGS. 4 and 5 except that the configurations of the fixing tool 40 and the stopper 41 are changed. Description is omitted. In this embodiment, when the foamed resin block 8 is molded, the fixture 40 is embedded in advance by insert molding, and the mounting surface 8a of the foamed resin block 8 is provided by a stopper 41 that is a bolt fastened to the fixture 40. The wall material 10 is fixed to the wall. The fixture 40 is formed with an anchor portion 43 projecting outward at the base end portion of the rod-like member 42, and a screw hole (female screw) 44 into which the stopper 41 can be screwed is formed at the front portion of the rod-like member 42. A fixing portion 45 is provided, and a connecting portion 46 that connects the fixing portion 45 and the anchor portion 43 is formed at the rear portion of the rod-shaped member 42. A pair of left and right insertion holes 24 are formed in the upper and lower portions of the wall member 10 so as to correspond to the substantially central portion of the fixing portion 45. When the wall member 10 is fixed to the mounting surface 8a of the foamed resin block 8, The wall material 10 is overlapped with the mounting surface 8 a of the foamed resin block 8, and a stopper (bolt) 41 is inserted into the insertion hole 24 and fastened to the screw hole 44 of the fixture 40. The assembly of the wall material 10 to the foamed resin block 8 may be performed at a factory or the like, or may be performed at the site during construction.

  In addition, also in the lightweight embankment 1A of the second embodiment, the foamed resin block 8 constituting the embedding part 9, the wall material 10 constituting the outer wall part 11, the foam waste glass material as the backfilling material 12, and the foaming The sandbag filled with waste glass in the bag, the concrete floor slab 13 and the like can be implemented in the same manner as in the first embodiment.

  The light weight embankment structure 1 and 1A according to the present invention as described above can be constructed easily and lightly without using a support column such as H-shaped steel for the outer wall portion 11 and can be operated with a small turn without requiring heavy machinery. . Furthermore, as the backfilling material 12 filled between the foamed resin block 8 which is the main constituent member and the inclined surface 5 of the supporting ground 3, a foamed waste glass that is lightweight and has a large internal friction angle is used. The earth pressure in the horizontal direction by the backfilling material 12 with respect to the foamed resin block 8 is small. Therefore, since the foundation is small and the excavation cross section of the inclined surface is small, in addition to road widening construction and retaining wall construction on slopes in mountainous areas, residential land creation for flood damage countermeasures, parking lots and land It can be suitably used for relatively small properties such as widening for effective use.

<Example 1>
As the foamed resin block constituting the embankment, a foamed polystyrene resin block having a height of 0.5 m (EPS block, bulk density (unit volume weight) = 0.20 kN / m ³ ) and an internal friction angle of 30 as a back-filling material Sliding safety factor when using foam waste glass (bulk density (unit volume weight) = 4.5 kN / m ³ ) (however, there is no compaction load) (safety factor that EPS block does not slide during construction is 1) .00) and the required width for preventing the EPS block from shifting is 2.0 m.

<Comparative Example 1>
The required width of the EPS block was calculated in the same manner as in Example 1 except that crushed stone (internal friction angle = 35 °, unit volume weight (bulk density) = 20 kN / m ³ ) was used as the back backing material. 0.0 m.

<Example 2>
Other than assuming the worker's own weight (0.600kN) at the time of construction as an overload on the EPS and the compaction load (1.000kN / m ² ) at the time of construction as an overload to the back-filling material When the required width of the EPS block was calculated in the same manner as in Example 1, it was 0.5 m.

<Comparative example 2>
The required width of the EPS block was calculated in the same manner as in Example 2 except that the same crushed stone as in Comparative Example 1 was used as the back-filling material, and it was 6.0 m.

  The results of Examples 1 and 2 and Comparative Examples 1 and 2 are summarized in Table 1.

  As is clear from Table 1, when using foamed waste glass as the backfill material, it is not necessary to fix the EPS block separately if the width of the EPS block is 2.00 m or more. In this case, it is not necessary to fix the EPS separately if the width of the EPS block is 0.50 m or more. On the other hand, when using crushed stone as a backfill material, it is necessary to set the width of the EPS block to 10.00 m or more, or to fix the EPS block separately. The width must be 6.00 m or more, or the EPS needs to be fixed separately.

<Example 3>
As the foamed resin block and backfill material, the same EPS block and foamed waste glass as in Example 1 were used, and a simple wall (surface density (unit area weight) = 0. The horizontal load and vertical load of the backfill material and the embankment when the outer wall portion was configured at 3 kN / m ² ) were calculated (see FIGS. 7 and 8).

<Comparative Example 3>
When the same crushed stone as in Comparative Example 1 is used as the backfilling material, and the outer wall portion is composed of a pillar made of H-shaped steel and a precast concrete panel (surface density of the outer wall portion (unit area weight) = 0.55 kN / m ² ) Except for the above, the horizontal load and the vertical load were calculated in the same manner as in Example 3 (see FIG. 9).

<Example 4>
The embodiment shown in FIG. 7 except that the EPS overlay thickness was changed from 0.3 m to 0.60 m, the EPS bank thickness was changed from 1.0 m to 6.00 m, and the total bank height was changed from 1.45 m to 6.90 m. The horizontal load and the vertical load were calculated in the same manner as in 3.

<Comparative example 4>
Comparative Example except that the EPS top soil thickness shown in FIG. 9 is changed from 0.3 m to 0.60 m, the EPS bank thickness is changed from 1.0 m to 6.00 m, and the total bank height is changed from 1.45 m to 6.90 m. The horizontal load and the vertical load were calculated in the same manner as in 3.

<Example 5>
The embodiment shown in FIG. 7 is the same as that shown in FIG. 7 except that the EPS overlay thickness was changed from 0.3 m to 1.00 m, the EPS bank thickness was changed from 1.0 m to 15.00 m, and the total bank height was changed from 1.45 m to 16.75 m. The horizontal load and the vertical load were calculated in the same manner as in 3.

(Comparative Example 5)
Compared to Fig. 9, except that the thickness on the EPS is changed from 0.3m to 1.00m, the EPS bank thickness is changed from 1.0m to 15.00m, and the total bank height is changed from 1.45m to 16.75m. The horizontal load and vertical load were calculated in the same manner as in Example 3.

  The results of Examples 3 to 5 and Comparative Examples 3 to 5 are summarized in Table 2.

  As is clear from the results shown in Table 2, in the light-weight embankment structure using the foamed resin block (EPS block), the outer wall portion has a small surface density (unit area weight) and is light and has a bulk density as a backfill material. By using foamed waste glass with a small (unit volume weight), the vertical load of the embankment is reduced, and the horizontal load of the backfill material, especially the earth pressure of the backfill material acting on the EPS block during an earthquake (horizontal load) ) Can also be reduced, and the angle of the inclined surface of the supporting ground can be increased. In addition, the concrete foundation that supports the embankment structure can be made smaller, and the excavation cross section of the natural ground can be made smaller, so the construction period can be shortened and construction costs can be reduced, and the entire embankment structure can be made smaller and lighter. The stable burden structure can be constructed by reducing the burden on the natural ground.

The longitudinal cross-sectional view of the lightweight banking structure which concerns on the 1st Embodiment of this invention. The plane sectional view of the important section of the lightweight embankment structure. The longitudinal cross-sectional view of the lightweight banking structure which concerns on the 2nd Embodiment of this invention. (A) is a perspective view of the foamed resin block with a wall material, (b) is a perspective view of the foamed resin block with a wall material of another structure. The principal part longitudinal cross-sectional view of the foamed resin block with a wall material. Furthermore, the foaming resin block with a wall material of another structure is shown, (a) is a longitudinal cross-sectional view of the principal part, (b) is a perspective view of a fixture. The dimension figure of the embankment structure used as the foundation of the load calculation in an Example. The dimension figure of the back-filling material used as the foundation of the load calculation in an Example and a comparative example. The dimension figure of the embankment structure used as the foundation of the load calculation in a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lightweight embankment structure 1A which concerns on 1st Embodiment Lightweight embankment structure 2 which concerns on 2nd Embodiment 2 Inclined surface of natural ground 3 Support ground 4 Horizontal surface of support ground 5 Inclined surface of support ground 6 Concrete foundation 6 'Not Mortar layer for land adjustment 7 Foundation material (crushed stone) 8 Foamed resin block 8a Wall material mounting surface 8b Inclined surface side end surface 9 Embankment portion 10 Wall material 11 Outer wall portion 12 Backfill material 13 Concrete floor slab 14 Roadbed 15 Top soil 15A Conventional Road surface 16 Fixing tool 17 Wall material stopper 18 Intermediate concrete floor slab 19 Mounting tool 20 Clearance 21 Fixing part 22 Connecting part 23 Anchor part 24 Insertion hole 25 Lower edge fitting part 26 Upper edge fitting part 27 Recessed part 28 Strip 29 Joint material 30 Clearance 40 Fixing tool 41 Stopping tool 42 Bar-shaped member 43 Anchor part 44 Screw hole 45 Fixing part 46 Connection part

Claims (4)

Filled between the outer wall, the embankment formed by laminating and laminating a plurality of foamed synthetic resin blocks on the back side of the outer wall, and the inclined surface side end surface and the inclined surface of the foamed synthetic resin block In the light-weight embankment structure composed of a backfill material, the surface density of the outer wall portion is 0.5 kN / m ² or less, and the backfill material has a bulk density of 2 to 10 kN / A lightweight embankment structure characterized by being a porous granular material within a range of m ³ . The lightweight embankment structure according to claim 1, wherein the outer wall has an area density of 0.35 kN / m ² or less.   The lightweight embankment structure according to claim 1, wherein an internal friction angle of a backfill material made of a porous granular material obtained by firing and foaming the waste glass is 30 ° or more. The lightweight embankment structure in any one of Claims 1-3 in which the said outer wall part is comprised from the wall material fixed integrally to the foam synthetic resin block which comprises the embankment part located in the back surface of this outer wall part. .

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