JP4499547B2 - Lightweight embankment structure and composite embankment structure consisting of it and reinforced earth wall structure - Google Patents

Description

  The present invention relates to a light-weight embankment structure having a feature in a wall surface material mounting structure, and a composite embankment structure including the reinforced soil wall structure.

  As one of embankment methods on soft ground or landslide land, there is known a lightweight embankment method using a resin foam block made of a foamed resin body such as expanded polystyrene (EPS) as a lightweight embankment as in the EPS method. Yes. At the time of construction, appropriate struts are erected, and resin foam blocks are stacked between the struts and the supporting ground to form a lightweight embankment layer of a predetermined height. A concrete floor slab is arranged on the upper surface of the stacked resin foam blocks, and a roadbed or asphalt pavement is made as a finishing work on the concrete floor slab to form a lightweight embankment structure.

  The resin foam block as a lightweight embankment is deteriorated by direct sunlight. In order to prevent this, a relatively lightweight wall surface material such as a lightweight concrete board is attached to the side surface of the resin foam block using a support column in order to impart weather resistance to the resin foam block. Vertically stacked resin foam blocks are self-supporting, so they can be sandwiched between resin foam blocks where appropriate supports are laminated without using uprights, and wall surfaces can be attached using them. (See Patent Document 1, Patent Document 2, etc.).

  A reinforced earth wall method is known as another embankment method. This is an embankment method used in places where the ground has sufficient proof strength, and wall materials are built up so that they are almost vertical, and soil that can be obtained on site, for example, is embedded as embankments It is. A wall surface material is connected to the tip of the tensile member embedded in the embankment using a hinge structure or the like to ensure the stability of the wall surface material and the embankment (see, for example, Patent Document 3). This construction method is advantageous in terms of cost compared to a lightweight embankment structure (lightweight embankment method). In the reinforced earth wall structure, since a large back pressure of the embankment acts on the wall surface material, a wall material having a large and thick weight is usually used as compared with a light weight embankment structure.

Japanese Patent Laid-Open No. 10-168909 JP 2002-317449 A JP-A-6-220855

  The large, thick, and heavy wall material has a heavy appearance on the side of the embankment structure. However, in the case of a construction method in which the wall material is directly attached to the resin foam block by the locking method described in Patent Document 1 or Patent Document 2, the resin foam block cannot withstand the weight of the wall material, There is a possibility that the resin foam block is damaged, and the arrangement of the wall surface material is disturbed.

  Moreover, when constructing a structure by the embankment method in a place where the proof strength of the foundation ground can be ensured to some extent, it is costly to cover all of the embankment with the resin foam block. Therefore, as long as the strength of the foundation ground permits, the lower level embankment is soil, and resin foam blocks are stacked on it, that is, the lower layer is a reinforced soil wall structure, and a lightweight embankment structure is built on it. Thus, it is recommended that one embankment structure (composite embankment structure) leads to a reduction in construction cost.

  In that case, as described above, a wall material with a heavy feeling is usually used in the reinforced earth wall structure. Therefore, if the wall material is also attached to the lightweight embankment structure constituting the upper layer, it is separately used for the wall material. It is necessary to stand upright column only on the lightweight embankment structure side. Therefore, different types of wall materials are used for the lower-layer reinforced earth wall structure and the upper-layer lightweight embankment structure, but this causes unnatural appearance.

  The present invention has been made in view of the circumstances as described above, and has been improved in a lightweight embankment structure in which a heavy wall surface material can be stably attached without standing uprights. An object is to provide a lightweight embankment structure. Another object of the present invention is to provide a heavy-weight wall material used for the reinforced soil wall structure in a composite embankment structure in which the lower layer is a reinforced earth wall structure and the upper layer is a lightweight embankment structure. An object of the present invention is to provide an improved composite embankment structure that can be attached to a lightweight embankment structure and that can unify the scenery of the wall surface after completion.

  The lightweight embankment structure according to the present invention is formed by stacking a resin foam block as a lightweight embankment material in multiple stages so that at least one side is a substantially vertical surface, and placing a finished structure material such as a concrete floor slab and a roadbed on the upper surface, A lightweight embankment structure having at least a structure in which wall surfaces are attached to a side surface on a side surface, and a part or all of the resin foam block constituting the side surface to which the wall surface material is attached is a concrete layer on the upper surface. The tensile strength member is embedded in the concrete layer, and the wall surface material is attached to the side surface of the resin foam block using the tip of the tensile member.

  In the lightweight embankment structure with the above structure, the weight of the wall surface material can be received by a wide contact surface between the concrete layer and the resin foam block. For example, even if the wall surface material is heavy, the resin foam block There is no destruction, and the wall surface material is stably held. Therefore, a lightweight embankment structure having a profound appearance can be reliably constructed. Of course, if it is not necessary, a light wall material made of lightweight concrete or the like can be attached.

  The tensile member may be a steel rod, a band-like member, or a net-like member. In short, any material may be used as long as it has the required strength and can be placed in the concrete to be cast when the concrete layer is formed, and integrated so as not to separate from the concrete due to hardening of the concrete.

  The resin foam block having the concrete layer on the upper surface preferably has the same thickness as the other resin foam blocks stacked in a state where the concrete layer is laminated. In that case, by using the resin foam block thinned by the thickness of the concrete layer, it becomes possible to give the resin foam block a function as a formwork, and the construction can be made efficient. .

  Preferably, many unevenness | corrugations are formed in the surface which contacts the concrete of the resin foam block which has a concrete layer on the upper surface. By forming the irregularities, the contact surface with the concrete layer made of cast-in-place concrete can be increased, and the integration of the concrete layer and the resin foam block is promoted. It becomes possible to support stably.

  Preferably, the wall surface material is attached to the tip of a tensile member embedded in the concrete layer via a hinge structure. A resin foam block such as an EPS block is an elasto-plastic material. When a roadbed or asphalt pavement is stacked on a concrete floor slab as a finishing work, the resin foam block slightly sinks. As described above, by adopting a structure in which the wall surface material is attached via the hinge structure, the wall surface material and the resin foam block can be in an edge-cut state without affecting the wall surface material arranged in multiple stages, The settlement of the resin foam block can be allowed.

  Preferably, a gap is formed between the wall materials positioned above and below. In this case, when the resin foam block sinks due to an overload, the sinking is absorbed by the gap between the wall surface materials, so the wall surface material is attached to the tip of the tensile member embedded in the concrete layer via the hinge structure. Of course, even if it is attached without using a hinge structure, the settlement does not affect the wall material arranged in multiple stages. When sunlight enters through the gap and it is assumed that the resin foam block is slightly deteriorated, it is desirable to interpose an appropriate cushion material in the gap.

  In the lightweight embankment structure according to the present invention, a tensile member may be embedded in a concrete floor slab formed on the upper surface of the stacked resin foam blocks, and a wall material may be attached to the tip of the tensile member. . By adopting this mode, a more stable wall surface material mounting structure is secured.

  The present invention further discloses a composite embankment structure in which the above-described lightweight embankment structure is formed on the upper part of a conventionally known reinforced earth wall structure. There is no restriction on the structure of the reinforced earth wall structure, and any reinforced earth wall structure having a structure in which the wall surface material is arranged in multiple stages while being attached to the tip of a tensile member embedded in the embankment that is soil. . The above composite embankment structure is suitable as an embankment structure in a place where the support substrate has sufficient resistance to stably support the load even when part of the embankment is loaded on the soil. By using soil as part of the embankment, construction costs can be reduced. In addition, no matter what wall material is used for the lightweight embankment structure that is the upper layer, the wall material can be stably attached to the side of the light embankment made of resin foam blocks, The mounting of the wall material is stable.

  In the composite embankment structure described above, the tensile member for attaching the wall material of the lightweight embankment structure and the tensile member used for attaching the wall material of the reinforcing earth wall structure may be the same. Well, it can be different. However, it is preferable to use a material that is adjusted from the tensile member used to attach the wall material of the reinforced earth wall structure (for example, the length is adjusted to be short), and the number of parts on the construction site can be reduced. There are advantages you can do.

  In the composite embankment structure according to the present invention, the wall material attached to the reinforced earth wall structure and the wall material attached to the lightweight embankment structure may be different, but the same wall material as the wall material attached to the reinforced earth wall structure is used. Also, it is preferable to use it as a wall material even in a lightweight embankment structure, whereby the entire wall surface of the composite embankment structure after completion can be made uniform and have high design properties. In particular, by arranging both wall materials so as to form a substantially vertical continuous wall surface, it is possible to realize a landscape without a sense of incongruity. Of course, the entire composite embankment structure can also be constructed so that the wall surface of the lightweight embankment structure is positioned at a position that is retreated from the position of the wall surface of the reinforced earth wall structure.

  According to the present invention, in a lightweight embankment structure, even a heavy wall surface material can be stably attached to the side surface of the lightweight embankment without standing upright columns. Moreover, in the composite embankment structure in which the lower layer is a reinforced earth wall structure and the upper layer is a lightweight embankment structure, the same wall material as the heavy wall material used for the reinforced earth wall structure is used as the upper embankment lightweight embankment structure. It can be attached stably, and the scenery of the wall after completion can be unified.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a composite embankment structure according to the present invention, in which area A is a reinforced earth wall structure, area B is a lightweight embankment structure, and area C is a finished structure constructed thereon. The material is shown. FIG. 2 is a schematic sectional view showing another example of the composite embankment structure according to the present invention. FIG. 3 is a schematic view for explaining the wall material, the stacked resin foam blocks stacked in the lightweight embankment structure, and the portion of the wall material attached to the side surface, and FIG. 4 is a concrete for fixing the wall material. Some examples of the resin foam block arrange | positioned in the position which forms a layer are shown. FIG. 5 is a diagram schematically showing several modes of the connecting portion forming a hinge structure between the wall surface material and the tensile member. 6-8 is a schematic diagram which shows three examples of the fixing structure of the wall surface material employ | adopted with the reinforced earth wall structure.

  When constructing the composite embankment structure shown in FIG. 1, first, the foundation ground 1 is flattened, and the reinforced soil wall structure A is constructed thereon. The construction of the reinforced earth wall structure A may be conventionally known, and the construction procedure will be briefly described with reference to FIG. In this example, the foundation concrete 2 is placed on the foundation ground 1, and the wall material 3 is installed almost vertically thereon. After embankment to the required height, the tip of the tensile member 5 is preferably connected by a hinge structure to the connector 4 attached to the back surface of the wall material 3. Further, after connecting the tensile member 5 by a required length using a coupler (not shown), the anchor member 6 is attached to the rearmost part.

  After finishing the installation of the wall surface material 3 and the attachment of the tensile member 5 and the anchor member 6 over the required distance, the wall surface material 3 is piled up again and the required height is filled and rolled. The tensile member 5 and the anchor member 6 are attached to the wall surface material 3 on the rolled embankment surface. Thereafter, the same work is repeated until the required height is reached, and the mortar 7 and crushed stone are laid on the top to level the work. In the reinforced soil wall structure A described above, the embankment is soil and a large lateral pressure acts on the wall surface material 3, so that it is usually used as a heavy and thick wall surface material 3.

  It is assumed that a light-weight embankment structure B having a required height is constructed on the reinforced earth wall structure A in relation to the durability of the foundation ground 1 and the construction cost. First, the resin foam block 10 is laid on the floor mortar 7 in the required number of steps (one stage in the example of FIG. 1), and the wall material 3 attached to the reinforced earth wall structure A is similar. The wall materials 3 are stacked in a vertical manner so that a slight gap S is formed. Preferably, the gap S is filled with an appropriate cushion material (not shown). At that time, as shown in FIG. 4a, a resin foam block 10A having a thinned region 11 on the wall surface side is used as the resin foam block 10A that faces the stacked wall material 3. Lay it on the required road length along the wall surface material 3.

  Concrete is cast in the area 11 where the thickness of the resin foam block 10A is reduced to the same height as the upper surface of the resin foam block 10A to form a concrete layer 12, and the stacked wall material 3 An appropriate tensile member 20 is embedded in the placed concrete at a location facing the position of the connector 4 provided on the back surface and integrated with the concrete. By using the resin foam block 10A in the form as shown in the figure, the resin foam block 10A can also serve as a mold for concrete placement.

  The distal end of the tensile member 20 and the connector 4 provided on the back surface of the wall surface material 3 are connected by appropriate means. 4A, 4B, and 4C show an example of the connecting portion. As shown in the figure, taking a connecting mode in which an appropriate hinge structure is formed between the two is the effect of the resin foam block 10 due to an overload. It is desirable because it can absorb subsidence. In the case where the tensile member 20 is located at the overlapping portion of the wall surface materials 3 and 3 as shown in FIG. 1 due to the relationship between the thickness of the resin foam block 10 and the height of the wall surface material 3. The connecting body 4a for connecting the upper and lower resin foam blocks 10A and 10A while maintaining the gap S is attached, and the tip of the tensile member 20 is connected to the back surface thereof.

  After the cast concrete is hardened, the resin foam blocks 10 are further stacked in the required number of steps (two in the illustrated example), and the concrete layer 12 is formed in the same manner on the upper resin foam block 10A. Then, the tensile member 20 is embedded and connected to the wall surface material 3 (see also FIG. 3). Finally, the concrete floor slab 13 is constructed, and a similar tensile member 20 is embedded therein, and the tip thereof is connected to the wall surface material 3. Hereinafter, as finishing construction C, the ground cover 14, the roadbed 15, the asphalt pavement 16 and the like are constructed, and the construction is completed.

  In the above-mentioned lightweight embankment structure B, a concrete layer 12 is formed along the length of the resin foam block 10A in contact with the back surface of the wall surface material 3, and the wall surface material 3 is interposed via a tensile member 20 disposed there. Therefore, the weight of the wall surface material 3 is supported by a wide area which is a contact surface between the concrete layer 12 and the resin foam block 10A, and is heavy for normal use in the reinforced earth wall structure A. Even if the thick wall surface material 3 is attached as the wall surface material, the resin foam block 10A is not broken, and stable wall surface material holding can be secured. Therefore, a composite embankment structure having a side wall surface with a uniform appearance can be obtained.

  FIG. 2 shows another example of the composite embankment structure according to the present invention, in which the wall surface of the lightweight embankment structure B is located at a position retreated from the position of the wall surface of the reinforcing earth wall structure A. . In this case, preferably, in the place where the wall surface material 3 of the lightweight embankment structure B on the upper surface of the reinforced soil wall structure A is located, in order to stabilize the lower wall material 3 during construction, some foundation It is desirable to construct 17. Moreover, the open part OS in the upper surface of the reinforced earth wall structure A can also be used as a vegetation area.

  FIGS. 4 b to 4 d show another example of the resin foam block 10 </ b> A in contact with the back surface of the wall surface material 3. The resin foam block 10A of FIG. 4b has a large number of irregularities 11a formed in the thinned region 11, and by providing such irregularities 11a, the concrete layer 12 to be cast on site and the resin foam Integration with the body block 10A is promoted. The resin foam block 10A of FIG. 4c is composed of a resin foam block 10A1 that forms a region 11 with a reduced thickness, and a resin foam block 10A2 that has a normal thickness separated from the resin foam block 10A1. The resin foam block 10A of FIG. 4d is composed of one resin foam block 10A3 that is a region 11 whose thickness is reduced as a whole. In this case, the concrete layer 12 is formed on the entire top surface of the resin foam block 10A3.

  As the tensile member 20 used in the lightweight embankment structure B according to the present invention, any member can be used as long as it can be integrated with the concrete layer 12 and can lock the wall surface material 3. In the example described based on FIGS. 1 to 5, the bar member is shown as the tensile member 20, but the present invention is not limited to this. Preferably, the same tensile member as the rod-shaped tensile member 5 used in the conventional reinforced earth wall structure A described with reference to FIG. 6 is used. Thereby, the number of articles at the construction site can be reduced. However, since the lateral pressure acting on the wall surface material 3 is small in the case of a lightweight embankment structure, the anchor member 6 is unnecessary, and the tensile member 5 that is removed from the coupler and shortened in length can be used freely. Can achieve the purpose.

  Further, in the reinforced earth wall structure A, a mesh-like tensile member 5a as shown in FIG. 7 or a belt-like tensile member 5b as shown in FIG. 8 may be used. The tension member can also be used as the tensile member 20 in the lightweight embankment structure B according to the present invention. However, when it is used, after cutting into a mesh-like tensile member 5a or a belt-like tensile member 5b to a predetermined width or length, To be embedded in.

  Although not shown, it is naturally possible to directly construct the lightweight embankment structure B according to the present invention on the foundation ground 1 in this case, and in that case, a solid wall material is stably attached. Therefore, it is possible to obtain a light weight embankment structure having excellent appearance.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the composite embankment structure by this invention, the area | region A shows a reinforced earth wall structure, the area | region B shows a lightweight embankment structure, and the area | region C shows the finishing structure material constructed on it. ing. The schematic sectional drawing which shows the other example of the composite embankment structure by this invention. Schematic for demonstrating the part of the wall surface material attached to the resin foam block and the side surface stacked in the lightweight embankment structure. The figure which shows some examples of the resin foam block arrange | positioned in the position which forms the concrete layer which fixes wall surface material. The figure which shows typically some aspects of the connection part which makes the hinge structure between a wall surface material and a tensile member. The schematic diagram which shows an example of the fixing structure of the wall surface material employ | adopted with the reinforced earth wall structure. The schematic diagram which shows the other example of the fixing structure of the wall surface material employ | adopted with the reinforced earth wall structure. The schematic diagram which shows the further another example of the fixing structure of the wall surface material employ | adopted with the reinforced earth wall structure.

Explanation of symbols

A ... Reinforced soil wall structure, B ... Lightweight embankment structure, C ... Finishing construction, 1 ... Foundation ground, 2 ... Foundation concrete, 3 ... Wall material, 4 ... Connector, 5, 20 ... Tensile member, 6 ... Anchor Member: 7 ... Plastic mortar, 10 ... Resin foam block, 10A ... Resin foam block facing wall surface material, 11 ... Thinned region, 12 ... Concrete layer, 13 ... Concrete floor slab, 14 ... Ground cover Work, 15 ... Roadbed, 16 ... Asphalt pavement, S ... Gap between upper and lower wall materials

Claims (9)

The resin foam blocks are stacked as a lightweight embankment material in multiple stages so that at least one side is almost vertical. Finished structural materials such as concrete floor slabs and roadbeds are placed on the upper surface, and wall materials are attached to the side in multiple stages. A light-weight embankment structure having at least a configuration comprising:
A part or all of the resin foam block constituting the side surface to which the wall material is attached has a region whose thickness is reduced on the upper surface compared to the thickness of the other resin foam block, and the region the concrete has a concrete layer that Da設and in the concrete layer are embedded tensile member, the wall member by utilizing the leading end of said antibody Zhang member on the side surface of the resin foam block Lightweight embankment structure characterized by being attached. The surface of the resin foam block having a concrete layer in which the thickness is reduced compared to the thickness of the other resin foam block on the upper surface and the concrete is placed in the region has a large number of irregularities on the surface in contact with the concrete. The lightweight embankment structure according to claim 1, wherein:   The lightweight embankment structure according to claim 1 or 2, wherein a wall surface material is attached to a tip of a tensile member embedded in the concrete layer via a hinge structure.   The lightweight embankment structure according to any one of claims 1 to 3, wherein a gap is formed between the wall materials positioned above and below.   The lightweight embankment structure according to any one of claims 1 to 4, wherein a tensile member is embedded in the concrete floor slab, and a wall material is attached to the tip of the tensile member. A reinforced earth wall having a structure in which the light-weight embankment structure according to any one of claims 1 to 5 is arranged in multiple stages while attaching a wall surface material to the tip of a tensile member embedded in the earth embankment. A composite embankment structure characterized by being formed on an upper part of the structure. The tensile member for attaching the wall material of the lightweight embankment structure is adjusted to be shorter than the tensile member used to attach the wall material of the reinforced earth wall structure. Item 7. A composite embankment structure according to item 6.   The same wall material as the wall material attached to the reinforced earth wall structure is used as the wall material of the lightweight embankment structure, and both wall materials are formed so as to form a substantially vertical continuous wall surface. The composite embankment structure according to claim 6 or 7, characterized in that   The composite embankment structure according to claim 6 or 7, wherein the wall surface of the lightweight embankment structure is located at a position retreated from the position of the wall surface of the reinforced earth wall structure.

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