JP2005146618A - Lightweight banking with retaining wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the increase of load to a retaining wall 1 following the compressive deformation of foam plates 2 by piling up the foam plates 2 with a clearance 5 to the retaining wall 1, without impeding concrete placing work for forming an upper concrete floor slab 7 even if piling up the foam plates 2 with the space 5 to the retaining wall 1 in lightweight banking with the retaining wall formed with the upper concrete floor slab 7 on the synthetic resin foam plates 2 piled up inside the retaining wall 1. <P>SOLUTION: The foam plates 2 are piled up with the clearance 5 to the inner surface of the retaining wall 1, and the foam plates 2 in the uppermost stage are piled projecting onto the retaining wall 1 side to form an upper hood part 6 closing the clearance 5. Concrete is placed on the foam plates 2 in the uppermost stage including the upper hood part 6 to form the upper concrete floor slab 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a lightweight embankment with a retaining wall in which synthetic resin foam plates are stacked inside a retaining wall, and concrete is placed on the stacked foam plates to form an upper concrete floor slab.

  Conventionally, a lightweight embankment with a retaining wall is obtained by stacking foam plates stacked on the inner side of the retaining wall with the retaining wall side end surface being abutted against the inner surface of the retaining wall (for example, Patent Document 1 and Patent Document 2). Etc.)

JP 2000-192464 A JP 2000-273870

  In general, the foam plates stacked on the inside of the retaining wall of the lightweight embankment with retaining wall are compressed with time, and the end face swells accordingly.

  In the case of the conventional lightweight embankment with retaining wall, the retaining wall side end surface is abutted against the retaining wall inner surface as described above. There is a problem that it is difficult to sufficiently obtain the effect even if the light pressure foam plates are stacked inside to reduce the earth pressure applied to the retaining wall. For this reason, it is necessary to increase the strength of the retaining wall, which causes an increase in cost.

  By the way, if the foam plate is stacked with a gap between it and the retaining wall, even if the foam plate is compressed and deformed and its end surface bulges, the gap absorbs this, and the inner surface of the retaining wall is strongly outward. Can be prevented from being pressed.

  However, the upper concrete floor slab formed on the stacked foam plates is usually formed by placing reinforcement on the foam plates and placing concrete, so if the gap is left open, The concrete for forming the upper concrete floor slab flows into this gap, which not only increases the consumption of concrete, but also fills the gap. In addition, a precast concrete structure is usually used as the retaining wall, and if the stack height of the foam plates exceeds the retaining wall height, the raised part is placed on the upper part of the retaining wall at the site prior to the placement of the upper concrete slab. However, if the gap is left open, the concrete for forming the raised portion will flow into the gap. For this reason, an operation of closing the gap with an appropriate joint material or the like is necessary, which increases the number of processes and prolongs the construction period.

  Further, depending on the installation location or the like, a retaining wall having a cross-sectional shape that is not perpendicular to the inner surface but inclined outward is used. For these retaining walls, if the foam plates are stacked against the inner surface, the length of the foam plates laid on each stage will be slightly different depending on the inclination of the retaining wall, and the length will be adjusted on site. There is a problem that the amount of cut ends increases.

  The present invention has been made in view of the above-described conventional problems, and stacks foam plates with a gap between the retaining walls so that an increase in load on the retaining walls due to compression deformation of the foam plates can be prevented. The first object is to prevent the concrete placing work for forming the upper concrete floor slab and the raised portion from being obstructed even if the foam plates are stacked with a gap between the retaining wall and the retaining wall. And Moreover, this invention makes it the 2nd objective to suppress the increase in the end cut at the time of stacking a foam board inside the retaining wall in which the inner surface inclined outward.

  According to a first aspect of the present invention, in order to achieve the first object, a foamed plate made of synthetic resin is stacked inside a retaining wall, and an upper concrete floor slab is formed on the stacked foamed plate. In the lightweight embankment, the foam plate is stacked with a gap between the inner surface of the retaining wall, while the uppermost foam plate protrudes on the retaining wall side and is stacked to close the gap. A lightweight embankment with a retaining wall is provided, wherein the upper concrete floor slab is formed of concrete placed on the uppermost foam plate including the upper eaves portion. It is.

  In the first aspect of the present invention, the upper concrete floor slab extends to the retaining wall so as to secure the maximum area of the upper concrete floor slab and to absorb the subsidence of the upper concrete floor slab accompanying the compression deformation of the foam plate. In addition, a spacer that is more easily compressed and deformed than the foam plate is interposed between the upper concrete floor slab and the retaining wall as a preferred embodiment, and the retaining wall of the upper eaves part accompanying the compression deformation of the foam plate is included. In order to suppress the pressing force, at least the retaining wall side end foam plate of the step constituting the upper eaves portion is a laminate of a plurality of foam plates, and one of the foam plates constituting this laminate product A preferred embodiment includes the formation of an upper eaves portion.

  According to the second aspect of the present invention, in order to achieve the first object, a synthetic resin foam plate is stacked on the inner side of the retaining wall, and an upper concrete floor slab is placed on the stacked foam plate. In light-weight embankments with walls, the foam plates are stacked higher than the retaining walls with a gap between the inner surfaces of the retaining walls, while the foam plates in the lower part of the upper foam plate are lower than the retaining walls. The upper eaves that close up the gap are formed by projecting to the wall side, and the concrete is placed on the retaining wall to fill the gap on the upper eaves, raising the retaining wall height In addition, the present invention provides a lightweight embankment with a retaining wall, characterized in that the raised concrete portion is formed and the upper concrete floor slab is formed of concrete cast on the uppermost foam plate.

  In the second aspect of the present invention, the upper concrete floor slab extends to the raised portion so that the area of the upper concrete floor slab is ensured to the maximum and the settlement of the upper concrete floor slab accompanying the compression deformation of the foam plate can be absorbed. In addition, it is preferable that a spacer, which is more easily compressed and deformed than the foamed plate, is interposed between the upper concrete floor slab and the raised portion.

  Further, in the first and second aspects of the present invention, even when an intermediate concrete slab is provided, the foam plates in the intermediate portion are projected and stacked on the retaining wall side so that the placement can be easily performed. And forming an intermediate eaves portion that closes the gap, and the intermediate concrete floor slab is formed of concrete cast on a foam plate of the intermediate portion including the intermediate eaves portion. In addition, in order to suppress the pressing force of the retaining wall by the intermediate eaves part due to the compression deformation of the foamed plate, the foam plate at the retaining wall side end of the step constituting the intermediate eaves part is a laminate of a plurality of foam plates In order to achieve the second object of the present invention, it is preferable that the intermediate eaves portion is formed by one of the foam plates constituting the laminated product. The inner surface of the , Foam plate is intended to include a preferred embodiment that are stacked end face of the retaining wall side aligned vertically substantially vertically. In particular, when the inner surface of the retaining wall is inclined outward, the retaining wall side end surface of the lowermost foam plate is brought into contact with the inner surface of the retaining wall in order to further stabilize the stacked state of the synthetic resin foam plates. Is included as a preferred embodiment.

  According to the first aspect of the present invention, the foam plate is stacked with a gap between the inner surface of the retaining wall, and the upper eaves portion that closes the gap by stacking with the uppermost foam plate protruding toward the retaining wall side. It is possible to prevent the inflow of concrete into the gap. Therefore, the upper concrete floor slab can be constructed without providing a special process for preventing the inflow of the concrete into the gap, and the foamed plate can be compressed and deformed over time without prolonging the construction period. Accordingly, a lightweight embankment that does not increase the load on the retaining wall can be obtained. Similarly, according to the second aspect of the present invention, the raised portion can be constructed without providing a special process for preventing the inflow of concrete into the gap, and the construction period can be prolonged without prolonging the construction period. A lightweight embankment that does not increase the load on the retaining wall with the compression deformation of the foam plate can be obtained.

  Hereinafter, the present invention will be further described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a first example of a lightweight embankment with a retaining wall according to the present invention, in which 1 is a retaining wall and 2 is a foam plate.

  The retaining wall 1 may be a reinforced concrete structure that is constructed on site, but a precast concrete structure is generally used. The retaining wall 1 of this example has an L-shaped cross section in which a base portion 4 extends in one direction at the lower end of a wall portion 3 that is erected. The retaining wall 1 is installed with the base portion 4 facing the stacked region side of the foam plate 2, and the inner surface of the retaining wall 1 (the surface of the wall portion 3 on the foam plate 2 side) is inclined outward.

  The foam plate 2 is made of a synthetic resin foam and is stacked inside the retaining wall 1.

  As the synthetic resin foam constituting the foamed plate 2, those having excellent strength and water resistance are preferable. For example, polystyrene foam, polyethylene foam, polyurethane foam and the like can be used, and polystyrene foam is particularly preferable. . In addition, the foamed plate 2 may be formed by extrusion molding or bead foam molding, but in terms of strength, the one formed by extrusion foam molding is preferable.

  The foam plate 2 has an end surface that is in contact with the inner surface of the retaining wall 1 at the bottom, but is stacked with the end surface on the retaining wall 1 side aligned substantially vertically and between the inner surface of the retaining wall 2. A gap 5 is formed in which the interval gradually increases as it goes upward. Therefore, even if the foam plate 2 is compressed and deformed with time and the end surface on the retaining wall 1 side bulges, the retaining wall 1 is pressed outward by the gap 5 except for a part of the lower end. Can be prevented.

  The foam plate 2 can be separated from the inner surface of the retaining wall 1 over the entire height, but when the inner surface of the retaining wall 1 is inclined outward as in this example, the retaining wall is at the lowest level. It is preferable that the gap 5 gradually increases as it goes upward by placing the end face on the inner surface of 1 and stacking the end faces on the retaining wall 1 side up and down substantially vertically. As shown in FIG. 1, the lightweight embankment with retaining walls is usually constructed by providing retaining walls 1 on the valley side and stacking foam plates 2 between the slopes on the mountain side and the retaining walls 1. When the lowermost foam plate 2 is brought into contact with the inner surface of the retaining wall 1, slippage of the foam plate 2 along the slope on the mountain side can be easily suppressed, and the stacked state of the foam plates 2 can be further stabilized. Further, by stacking the end faces of the foam plate 2 on the retaining wall 1 side so as to be substantially vertically aligned, the gap 5 can be formed by utilizing the inclination of the inner surface of the retaining wall 1 and at the same time Since the laying length of 2 can be determined regardless of the inclination of the inner surface of the retaining wall 1, the length of the foam plate 2 can be easily allocated, and the amount of cuts caused by the length adjustment at the site can be reduced. it can.

  As shown in FIG. 1, the uppermost foam plate 2 protrudes and is stacked on the retaining wall 1 side, and constitutes an upper eaves portion 6 that closes the gap 5. An upper concrete floor slab 7 is provided on the uppermost foam plate 2. The upper concrete floor slab 7 serves as a ground for the site and road surface formed thereon, and serves to protect the foam plate 2 from the load and impact applied from above and to disperse the load. The upper concrete floor slab 7 can be formed by stacking the foamed plates 2 to a required height, placing reinforcement on the uppermost foamed plate 2, and placing concrete. When the upper concrete floor slab 7 is formed, the gap 5 is closed by the upper eaves part 6, so that the concrete for forming the upper concrete floor slab 7 is the uppermost foam plate 2 including the eaves part 6. Even if placed on top, the concrete does not flow into the gap 5.

  Moreover, it is preferable that the upper concrete floor slab 7 is extended even on the retaining wall 1 so that the maximum area can be ensured, as FIG. 1 shows. When forming the upper concrete floor slab 7, a spacer 8 that is easier to compress and deform than the foam plate 2 is installed on the top of the retaining wall 1, and then the concrete for forming the upper concrete floor slab 7 is placed. The spacer 8 is preferably interposed between the upper concrete slabs 7. By interposing this spacer 8, even if the foam plate 2 is compressed and deformed with time and the upper concrete floor slab 7 sinks, it can be absorbed by the compressive deformation of the spacer 8, and the upper concrete floor It is possible to prevent an irregular load from being applied to both sides of the plate 7 that is supported by the retaining wall 1. As the spacer 8, soft rubber, synthetic resin foam, or the like can be used.

  In FIG. 1, 9 is a guardrail foundation integrated with the upper concrete floor slab 7, and 10 is a guardrail.

  Next, a second example of the present invention will be described.

  FIG. 2 is a cross-sectional view showing a second example of the lightweight embankment with retaining wall according to the present invention, and the same reference numerals as those in FIG. 1 denote the same members or parts.

  This example is basically the same as the first example, except that the foam plate 2 in the middle in the vertical direction protrudes toward the retaining wall 1 and is stacked to form an intermediate eaves part 11 that closes the gap 5. The intermediate concrete floor slab 12 is made of concrete cast on the foam plate 2 of the intermediate part including the intermediate eaves part 11 and is different from the first example. This intermediate concrete floor slab 12 is provided for stabilizing the stacked state of the foam plate 2 and reinforcing the load by dispersing the load. The reinforcement is applied to the foam plate 2 stacked to a predetermined halfway height so that the concrete is placed. It can be formed by casting.

  In this example, the intermediate foam plate 2 protrudes toward the retaining wall 1 to form the intermediate eaves portion 11, thereby closing the gap 5, so that the intermediate concrete floor slab 12 is formed. Therefore, the concrete can be prevented from flowing out into the gap 5 when the concrete is placed.

  The intermediate concrete floor slab 12 is interposed as necessary, and can be omitted when the stacked height of the foamed plates 2 is not so high.

  FIG. 3 is a sectional view showing a third example of the lightweight embankment with retaining wall according to the present invention, and the same reference numerals as those in FIG. 1 denote the same members or parts.

  This example is basically the same as the second example, but the foam plate 2 of the step constituting the upper eaves portion 6 and the foam plate at the end of the holding wall 1 side of the step constituting the intermediate eaves portion 11. 2 is a laminate of a plurality of (four in FIG. 3) thin foam plates 2 ′, 2 ′,..., And the upper eaves portion 6 and the intermediate eaves portion 11 are thin foams constituting this laminate product, respectively. The point which is comprised by one board | plate 2 ', 2', ... differs from the 2nd example.

  Even if the thickness of each foam plate 2 is increased so that the stacking work of the foam plates 2 can be efficiently performed by using a laminated product of thin foam plates 2 ′, 2 ′,. The thickness of the foamed plate 2 ′ constituting the eaves part 6 and the intermediate eaves part 11 can be reduced. Therefore, even if the foam plate 2 is compressed and deformed with time, and a force that presses the retaining wall outward is applied via the upper eaves portion 6 and the intermediate eaves portion 11, it can be suppressed to a small extent. it can. Further, by aligning the overall thickness of the foamed plates 2 ′, 2 ′,... Constituting the laminated product with the thicknesses of the other foamed plates 2, 1 as in the foam plate 2 of the step constituting the upper eaves portion 6. Instead of making the entire step a laminated product, only the foamed plate 2 at the end of the retaining wall 1 can be made a laminated product like the foamed plate 2 of the step constituting the intermediate eaves part 11.

  The laminated product of the thin foamed plates 2 ′, 2 ′,... May be simply a stack of the thin foamed plates 2 ′, 2 ′,. 2 ′,... Are preferably integrated by bonding, or one integrated by binding with a fastener such as a band.

  In this example, both the upper eaves portion 6 and the intermediate eaves portion 11 are constituted by the thin foam plate 2 ′, but only one of them can be used. Further, as the foamed plates 2 ′, 2 ′,... Constituting the laminated product, extrusion foam molded products are preferable. An extruded foam molded product is difficult to obtain a block-like thick plate like a bead foam molded product, but a product with high compressive strength is easily obtained. For this reason, as shown in the figure, when a laminated product of the extruded foam molded product is used as the uppermost foam board 2 close to the loading surface, it becomes easy to prevent irregular settlement of the embankment surface.

  FIG. 4 is a sectional view showing a fourth example of the lightweight embankment with retaining walls according to the present invention, and the same reference numerals as those in FIG. 1 denote the same members or parts.

  This example is an example in which the raised portion 13 is integrally provided on the upper portion of the retaining wall 1 and the height is adjusted, and the foamed plates 2 are stacked higher than the retaining wall 1. Accordingly, a raised portion 13 is provided on the upper portion of the retaining wall 1.

  On the other hand, the foam plate 2 (the third-stage foam plate 2 from the top in the drawing) located at a position lower than the top of the retaining wall 1 among the upper foam plates 2 is projected and stacked on the retaining wall 1 side. An upper eaves portion 6 that closes the upper eaves portion 5 is configured, and a raised portion 13 that raises the height of the retaining wall 1 is made of concrete that is placed on the retaining wall 1 by filling the gap 5 on the upper eaves portion 6. Is formed.

  When the raised portion 13 is formed as described above, the upper eaves portion 6 protrudes, so that the concrete for forming the raised portion 13 is prevented from flowing into the gap 5 below the upper eave portion 6. can do. Further, the raised portion 13 can be formed in an inverted L-shaped cross-section so as to wrap the upper portion of the retaining wall 1 from the inner surface side, so that the integrity with the retaining wall 1 can be improved and the thicker and stronger raised portion can be formed. Part 13 can be used.

  The upper concrete floor slab 7 in this example can be formed by placing reinforcement on the top two foam plates after the formation of the raised portion 13 and placing concrete. As described in the first example, it is preferable that the upper concrete floor slab 7 extends to the raised portion 13 (on the retaining wall 1) so that the maximum area can be secured. Further, as described in the first example, in order to prevent one side of the upper concrete floor slab 7 from being supported by the retaining wall 1 and applying an irregular load to both, A spacer 8 that is more easily compressed and deformed than the foam plate 2 is placed on the top, and then concrete for forming the upper concrete floor slab 7 is placed, and the spacer 8 is interposed between the raised portion 13 and the upper concrete floor slab 7. It is preferable.

  In FIG. 4, the intermediate concrete floor slab 12 and the laminated product of thin foamed plates 2 ′, 2 ′,... Described in the second and third examples (see FIGS. 2 and 3) are not used. In the same manner as in the second and third examples, the upper eaves part 6 and the intermediate eaves part 11 are formed by interposing the intermediate concrete floor slab 12 or using a laminated product of thin foamed plates 2 ′, 2 ′,. You can also

It is sectional drawing which shows the 1st example of the lightweight banking with a retaining wall which concerns on this invention. It is sectional drawing which shows the 2nd example of the lightweight banking with a retaining wall which concerns on this invention. It is sectional drawing which shows the 3rd example of the lightweight banking with a retaining wall which concerns on this invention. It is sectional drawing which shows the 4th example of the lightweight banking with a retaining wall which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retaining wall 2 Foam board 2 'Thin foam board 3 Wall part 4 Foundation part 5 Crevice 6 Upper eaves part 7 Upper concrete floor slab 8 Spacer 9 Guardrail foundation 10 Guard rail 11 Middle eaves part 12 Intermediate concrete floor slab 13 Raised part

Claims (9)

In the lightweight embankment with retaining walls in which foam plates of synthetic resin are stacked inside the retaining wall, and the upper concrete floor slab is formed on the stacked foam plates,
While the foam plates are stacked with a gap between them and the inner surface of the retaining wall, the uppermost foam plates protrude and are stacked on the retaining wall side to form an upper eaves portion that closes the gap. A lightweight embankment with a retaining wall, wherein the upper concrete floor slab is formed of concrete placed on the uppermost foam plate including the upper eaves portion.   The upper concrete floor slab extends to the retaining wall, and a spacer that is more easily deformed by compression than a foamed plate is interposed between the upper concrete floor slab and the retaining wall. Lightweight embankment with retaining walls. In the lightweight embankment with retaining walls, foamed plates of synthetic resin are stacked inside the retaining wall, and the upper concrete floor slab is placed on the stacked foam plates,
The foam plate is stacked higher than the retaining wall with a gap between it and the inner surface of the retaining wall, while the foam plate located below the retaining wall of the upper foam plate protrudes toward the retaining wall. The upper eaves part that closes the gap is configured, and the raised part that raises the height of the retaining wall is formed by concrete that is placed on the retaining wall by filling the gap on the upper eaves part. In addition, a lightweight embankment with a retaining wall, wherein the upper concrete floor slab is formed of concrete cast on the uppermost foam plate.   The upper concrete floor slab extends to above the raised portion, and a spacer that is more easily deformed by compression than a foamed plate is interposed between the upper concrete floor slab and the raised portion. Lightweight embankment with retaining walls.   The foam plate at the end portion on the side of the retaining wall of the step constituting the upper eave portion is a laminate of a plurality of foam plates, and the upper eave portion is formed by one of the foam plates constituting the laminate product. The lightweight embankment with a retaining wall according to any one of claims 1 to 4.   An intermediate foam plate is projected and stacked on the retaining wall side to form an intermediate eaves portion that closes the gap, and the concrete is placed on the intermediate foam plate including the intermediate eave portion. A lightweight embankment with a retaining wall according to any one of claims 1 to 5, wherein an intermediate concrete slab is formed.   The foam plate at the at least the retaining wall side end of the step constituting the intermediate eave portion is a laminate of a plurality of foam plates, and the intermediate eave portion is formed by one of the foam plates constituting the laminate product. The lightweight embankment with a retaining wall according to claim 6.   The inner surface of the retaining wall is inclined outward, and the foamed plates are stacked with the end surface on the retaining wall side being substantially vertically aligned vertically. Lightweight embankment with retaining walls.   The lightweight embankment with a retaining wall according to claim 8, wherein the retaining wall side end surface of the lowermost foam plate is in contact with the inner surface of the retaining wall.

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