Embankment structure, precast concrete deck and embankment structure construction method

Abstract

To provide an embankment structure comprising a foamed resin block and a concrete floor slab, which suppresses slippage between the foamed resin block and a precast concrete floor slab even when an earthquake occurs.SOLUTION: An embankment structure 100 according to an embodiment is an embankment structure 100 that includes foamed resin blocks 7 for use in embankments and a concrete slab 6 that is provided on the foamed resin blocks 7. The concrete slab 6 has a precast concrete slab 61. The precast concrete slab 61 has spikes 65 embedded in the foamed resin blocks 7 on at least one of upper and lower surfaces that come into contact with the foamed resin blocks 7.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an embankment structure including a foamed resin block for embankment use and a concrete slab provided on the foamed resin block, a precast concrete slab, and a method for constructing an embankment structure. [Background technology]

[0002] BACKGROUND ART Patent Document 1 discloses a conventional technique relating to an embankment structure using foamed resin blocks.

[0003] The earthquake-resistant fastening structure for polystyrene foam blocks in Patent Document 1 fastens two adjacent polystyrene foam blocks together with an earthquake-resistant fastening fitting for polystyrene foam blocks, and the fastening fitting has a plate portion and a plurality of claw portions provided on the periphery of the plate portion and formed by bending the plate portion perpendicularly. The plurality of fold lines formed between the plate portion and the plurality of claw portions are arranged along each side of a square. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-2692 Summary of the Invention [Problem to be solved by the invention]

[0005] In a conventional embankment structure using foam resin blocks, the plate portion of the fastening fitting described in Patent Document 1 is placed on the top surface of the foam resin block, and the claws bent downward from the plate portion are inserted into the foam resin block. Then, on top of the foam resin block on which the fastening fitting is attached, a topping member such as a concrete slab poured on-site, foam resin blocks, grass, or sheet material is placed.

[0006] In conventional embankment structures using such fastening hardware, when attempting to install a precast concrete slab or other overlaying component on top of the foam resin block, the plate portion of the fastening hardware exposed on the top surface of the foam resin block becomes an obstacle. Therefore, even if a precast concrete slab is installed on top of the foam resin block, the underside of the precast concrete slab and the top surface of the foam resin block cannot come into direct contact. The precast concrete slab rests on a metal surface, making it slippery and unable to provide adequate friction resistance. Therefore, in conventional embankment structures, the concrete slab is cast-in-place concrete, and the fastening hardware is entangled so that the concrete surface is in direct contact with the foam resin block, ensuring friction resistance. Thus, in conventional embankment structures, the concrete slab must be cast in place, making it difficult to safely install a precast concrete slab.

[0007] The present invention has been devised in consideration of the above-mentioned problems, and its purpose is to provide an embankment structure comprising foamed resin blocks and concrete slabs, in which sliding between the foamed resin blocks and the precast concrete slabs is suppressed even when seismic activity occurs, a precast concrete slab, and a method for constructing an embankment structure. [Means for solving the problem]

[0008] The embankment structure of the present invention is an embankment structure comprising a foamed resin block for use in embankments and a concrete slab provided on the foamed resin block, wherein the concrete slab has a precast concrete slab, and the precast concrete slab has spikes embedded in the foamed resin block on at least one of the upper and lower surfaces that come into contact with the foamed resin block.

[0009] The precast concrete slab of the present invention is a precast concrete slab installed on a foamed resin block for embankment, and is characterized in that it has spikes on at least one of the upper and lower surfaces that come into contact with the foamed resin block for embedding in the foamed resin block.

[0010] The method for constructing an embankment structure according to the present invention is a method for constructing an embankment structure comprising foamed resin blocks for use in embankments and a concrete slab to be placed on the foamed resin blocks, wherein the concrete slab has a precast concrete slab and spikes on at least one of the upper and lower surfaces, and the spikes of the precast concrete slab are embedded in the foamed resin blocks. [Effects of the Invention]

[0011] In the present invention, the concrete slab has a precast concrete slab, and spikes embedded in foam resin blocks are formed on the precast concrete slab. The spikes penetrate into the foam resin blocks, increasing the slip resistance of the precast concrete slab against the foam resin blocks. Therefore, even in the event of seismic motion, slippage between the foam resin blocks and the concrete slab is suppressed. By enabling direct surface contact between the foam resin blocks and the precast concrete slab in this way, the spikes installed on the contact surface of the precast concrete slab exert even greater slip resistance, making it possible to build a more stable structure than before. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view of an example of an embankment structure in the first embodiment, cut along a plane perpendicular to the extension direction. [Figure 2] FIG. 2 is a cross-sectional view of an example of an embankment structure in the first embodiment, cut along a plane perpendicular to the extension direction. [Figure 3] FIG. 3 is a cross-sectional view of an example of an embankment structure in the first embodiment, cut along a plane perpendicular to the extension direction. [Figure 4] Figure 4(a) is a front view showing an example of a spike on a concrete slab used in an embankment structure in the first embodiment, and Figure 4(b) is a bottom view showing an example of a spike on a concrete slab used in an embankment structure in the first embodiment. [Figure 5] FIG. 5 is a perspective view showing an example of a connector used in the embankment structure in the first embodiment. [Figure 6] FIG. 6 is a diagram showing an example of a block installation step in the method for constructing an embankment structure in the first embodiment. [Figure 7] FIG. 7 is a diagram showing an example of a concrete slab installation step in the method for constructing an embankment structure according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view of an example of an embankment structure according to the second embodiment, cut along a plane perpendicular to the width direction. [Figure 9] FIG. 9 is a cross-sectional view of an example of an embankment structure in the second embodiment, cut along a plane perpendicular to the width direction. [Figure 10] FIG. 10 is a cross-sectional view of an example of an embankment structure in the second embodiment, cut along a plane perpendicular to the extension direction. [Figure 11] FIG. 11 is a perspective view showing an example of a connector used in the embankment structure in the third embodiment. [Figure 12] FIG. 12 is a perspective view showing an example of a connector used in the embankment structure in the fourth embodiment. [Figure 13] Figure 13(a) is a front view showing an example of a spike on a concrete slab used in an embankment structure in the fifth embodiment, and Figure 13(b) is a bottom view showing an example of a spike on a concrete slab used in an embankment structure in the fifth embodiment. [Figure 14] Figure 14(a) is a front view showing an example of spikes on a concrete slab used in an embankment structure in the sixth embodiment, and Figure 14(b) is a front view showing an example of spikes on a concrete slab used in an embankment structure in the seventh embodiment. [Figure 15]Figure 15(a) is a front view showing an example of a spike on a concrete slab used in an embankment structure in the eighth embodiment, and Figure 15(b) is a bottom view showing an example of a spike on a concrete slab used in an embankment structure in the eighth embodiment. [Figure 16] FIG. 16 is a perspective view showing an example of a connector used in the embankment structure according to the ninth embodiment. [Figure 17] FIG. 17 is a cross-sectional view of an example of an embankment structure in the tenth embodiment, cut along a plane perpendicular to the extension direction. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an example of a connector and an embankment structure according to an embodiment of the present invention will be described with reference to the drawings.

[0014] <First embodiment: embankment structure 100> As shown in Figures 1 and 2, the embankment structure 100 is a lightweight embankment structure in which a plurality of foam resin blocks 7 for embankment are stacked. A road 9 is provided on the upper side of the embankment structure 100 as a superstructure. The embankment structure 100 comprises foam resin blocks 7, a concrete slab 6, embankment panels 8, and connectors 1. The embankment structure 100 has a concrete slab 6 as an upper slab provided between the road 9 and the foam resin blocks 7, and a concrete slab 6 as an intermediate slab provided between the foam resin blocks 7 arranged above and below. The embankment structure 100 has embankment panels 8 provided on both sides in the width direction, sandwiching the plurality of arranged foam resin blocks 7.

[0015] The road 9 has a roadbed 91 provided above the uppermost concrete slab 6, a paved section 92 provided above the roadbed 91, ground guardrails 93 provided on both sides of the roadbed 91 in the width direction, and a wall parapet 94 provided above the ground guardrails 93. The extension direction of the road 9 is the direction along the extension direction of the embankment structure 100, and the width direction of the road 9 is the direction along the width direction of the embankment structure 100. The roadbed 91 is made of, for example, gravel. The paved section 92 is made of, for example, asphalt.

[0016] The foamed resin block 7 is a so-called EPS block, and is formed in a rectangular parallelepiped shape. The material of the foamed resin block 7 can be a foam made of synthetic resin such as polystyrene, polyurethane, or polyvinyl chloride. The foamed resin blocks 7 are constructed by stacking multiple blocks in a staggered pattern, for example, with their positions shifted in the vertical and horizontal directions. The foamed resin blocks 7 weigh, for example, 12 kg to 30 kg per block, making them easy to carry and excellent for workability in constructing lightweight embankments, making them suitable for use. Note that multiple foamed resin blocks 7 may be stacked in a so-called "corner" configuration, for example, so that the sides are flush with each other.

[0017] Laterally adjacent foamed resin blocks 7 are connected to each other by a connector 1. Although not shown in the drawings, vertically adjacent foamed resin blocks 7 may be connected to each other by, for example, a connector 1 or by a well-known connecting metal fitting.

[0018] The concrete slab 6 includes a precast concrete slab 61 located in the center of the width of the embankment structure 100 and a cast-in-place concrete slab 69 located at each end of the width of the embankment structure 100. The precast concrete slab 61 is positioned across multiple foam resin blocks 7. The cast-in-place concrete slab 69 is located between the precast concrete slab 61 and the embankment panel 8. The concrete slab 6 has multiple precast concrete slabs 61 arranged in a staggered pattern in plan view in the center of the width of the concrete slab 6. The cast-in-place concrete slabs 69 are installed to adjust the widthwise ends of the multiple precast concrete slabs 61. This adjustment zone for the error between the precast concrete slab 61 and the embankment structure simplifies the shape of the precast concrete slab 61, facilitating management and reducing manufacturing costs. During construction, the precast concrete slabs installed in advance can be used as a work yard, allowing other types of work to be carried out simultaneously, improving work efficiency. Furthermore, construction can be carried out without being affected by the weather, which shortens the construction period.

[0019] As shown in FIG. 3 , the precast concrete slab 61 has spikes 65 embedded in the foam resin blocks 7 on its upper and lower surfaces 62 and 63, respectively. The upper surface 62 of the precast concrete slab 61 is in contact with the lower surface 72 of the foam resin block 7. The lower surface 63 of the precast concrete slab 61 is in contact with the upper surface 71 of the foam resin block 7. The spikes 65 formed on the upper surface 62 are embedded in the lower surface 72 of the foam resin block 7 above the upper surface 62. The spikes 65 formed on the lower surface 63 are embedded in the upper surface 71 of the foam resin block 7 below the lower surface 63. By having the spikes 65 on the precast concrete slab 61, even if unevenness occurs when the foam resin blocks 7 are arranged, the spikes 65 are partially embedded in the foam resin blocks 7, further improving slip resistance. This further improves the slip resistance performance of the precast concrete slab.

[0020] 4(a), spike 65 has a columnar portion 651 extending in a columnar shape from lower surface 63, and a tapered portion 652 formed in a cone shape at the tip of columnar portion 651. This makes it easy to insert spike 65 into foamed resin block 7. Although not shown in the figures, spike 65 formed on upper surface 62 also has a columnar portion 651 extending in a columnar shape from upper surface 62, and a tapered portion 652 formed in a cone shape at the tip of columnar portion 651.

[0021] As shown in FIG. 4(b), the columnar portion 651 is formed, for example, in the shape of a quadrangular column. The tapered portion 652 is formed, for example, in the shape of a quadrangular pyramid. The bottom shape of the tapered portion 652 is preferably formed in the same angular shape as the bottom shape of the tip of the columnar portion 651. The bottom shape of the tapered portion 652 may be, for example, a hexagonal or octagonal shape. Although not shown, the spikes 65 may be formed by roughening the main surface of the concrete slab 6 by broom finishing, washing, shot blasting, or the like. For example, the precast concrete slab 61 may have tapered spikes 65 formed on the lower surface and roughened spikes 65 formed on the upper surface.

[0022] As shown in Figure 2, the cast-in-place concrete slab 69 has a portion of an anchor member 83 buried inside, with the other portion of the anchor member 83 protruding from the surface facing the embankment panel 8. The other portion of the anchor member 83 is provided with a retaining member 84 that holds the support post 81. The cast-in-place concrete slab 69 is installed to adjust the ends of the concrete slab 6, and is poured after the precast concrete slabs 61 have been lined up and installed.

[0023] The embankment panel 8 is for protecting the foam resin block 7. The embankment panel 8 is made of, for example, concrete. The embankment panel 8 is attached to a support 81 via a fixture 82.

[0024] As shown in FIG. 3, the connector 1 connects foamed resin blocks 7 provided below a concrete slab 6. The connector 1 is embedded between laterally adjacent foamed resin blocks 7 and connects the laterally adjacent foamed resin blocks 7. The connector 1 is formed by bending a single steel plate with a thickness of approximately 0.5 mm to 4 mm. The connector 1 is inserted from the top surface 71 of the foamed resin block 7. The connector 1 has a plate-shaped connecting plate portion 2, a first anchor plate portion 31, a second anchor plate portion 32, a first claw portion 41, and a second claw portion 42. The connector 1 may further have a third claw portion 21.

[0025] As shown in FIG. 5 , the connecting plate 2 is formed in the shape of a flat plate with a uniformly flat main surface. The upper end surface 201 of the connecting plate 2 is formed horizontally. The lower end surface 202 of the connecting plate 2 is formed with a third claw 21 that protrudes downward. This allows the connector 1 to be easily inserted into the foamed resin block 7. The third claw 21 has a pair of inclined portions 211, 212 formed on both sides of the top portion 21a, a vertical portion 213 extending vertically from the inclined portion 211, and a vertical portion 214 extending vertically from the inclined portion 212. This ensures that the connector 1 has sufficient cross-sectional strength to withstand being hammered in by impact, making it easier to insert into the foamed resin block 7.

[0026] The first anchor plate 31 is formed by bending one side end of the connecting plate 2 into an L-shape in plan view. This further prevents the connector 1 from sliding sideways when the first anchor plate 31 is embedded in the foamed resin block 7. The first anchor plate 31 has an upper end surface 311 that is horizontal and is formed flush with the upper end surface 201 of the connecting plate 2.

[0027] The second anchor plate 32 is formed by bending the other side end of the connecting plate 2 into an L-shape in plan view. This further prevents the connector 1 from sliding sideways when the second anchor plate 32 is embedded in the foamed resin block 7. The second anchor plate 32 has an upper end surface 321 that is horizontal and is formed flush with the upper end surface 201 of the connecting plate 2.

[0028] The second anchor plate 32 is formed by bending the other side end portion to the side opposite to the side on which the first anchor plate 31 is arranged, using the surface along the connecting plate 2 as a reference plane. In other words, the second anchor plate 32 is arranged so as not to face the first anchor plate 31. This makes it easy to stack the connecting plate portions 2 of the multiple connectors 1 when transporting them. This improves the transportability of the multiple connectors 1. The second anchor plate 32 is arranged parallel to the first anchor plate 31.

[0029] The first claw portion 41 protrudes downward so that the end face of the bent portion between the connecting plate portion 2 and the first anchor plate portion 31 forms the apex 41a. This allows the connector 1 to be easily inserted into the foamed resin block 7. The first claw portion 41 is formed along the connecting plate portion 2 and the first anchor plate portion 31 in an L-shape when viewed from the protruding direction of the first claw portion 41. The first claw portion 41 may have at least one of a portion that follows the connecting plate portion 2 and a portion that follows the first anchor plate portion 31. The first claw portion 41 has an inclined portion 411 on the connecting plate portion 2 side that is inclined from the apex 41a, an inclined portion 412 on the first anchor plate portion 31 side that is inclined from the apex 41a, a vertical portion 413 that extends vertically from the inclined portion 411, and a vertical portion 414 that extends vertically from the inclined portion 411. This allows the connector 1 to be more easily inserted into the foamed resin block 7. Furthermore, the vertical portion 413 of the first claw portion 41 further has a protrusion 415. This makes it possible to prevent the connector 1 from being pulled out of the foamed resin block 7.

[0030] The second claw 42 protrudes downward so that the end face of the bent portion between the connecting plate 2 and the second anchor plate 32 forms the apex 42a. This allows the connector 1 to be easily inserted into the foamed resin block 7. The second claw 42 is formed along the connecting plate 2 and the second anchor plate 32 in an L-shape when viewed from the protruding direction of the second claw 42. The second claw 42 may have at least one of a portion that follows the connecting plate 2 and a portion that follows the second anchor plate 32. The second claw 42 has an inclined portion 421 on the connecting plate 2 side that is inclined from the apex 42a, an inclined portion 422 on the second anchor plate 32 side that is inclined from the apex 42a, a vertical portion 423 that extends vertically from the inclined portion 421, and a vertical portion 424 that extends vertically from the inclined portion 421. This allows the connector 1 to be more easily inserted into the foamed resin block 7. Furthermore, the vertical portion 423 of the second claw portion 42 further has a protrusion 425. This makes it possible to prevent the connector 1 from being pulled out of the foamed resin block 7.

[0031] <First embodiment: Method for constructing embankment structure 100> The construction method for the embankment structure 100 is an embankment construction method that uses foamed resin blocks 7 for the embankment and a concrete slab 6 that is placed on the foamed resin blocks 7. The construction method for the embankment structure 100 involves placing the concrete slab 6 on top of a plurality of foamed resin blocks 7 that are lined up side by side. The construction method for the embankment structure 100 includes, for example, a block installation process, a concrete slab installation process, and a panel installation process.

[0032] In the method for constructing the embankment structure 100, the pillars 81 are erected in advance at intervals in the width direction.

[0033] Then, as shown in FIG. 6, in the block installation step, a plurality of foamed resin blocks 7 are installed between support posts 81 (not shown) spaced apart in the width direction, lined up in the vertical and horizontal directions.

[0034] Then, in the block setting step, the connector 1 is inserted from the upper surfaces 71 of two laterally adjacent foamed resin blocks 7. In the block setting step, the connector 1 is embedded between the laterally adjacent foamed resin blocks 7 and connects the laterally adjacent foamed resin blocks 7 together so that the connector 1 does not protrude from the upper surfaces 71 of the foamed resin blocks 7.

[0035] In the block installation process, the first claw portion 41 is embedded in one foam resin block 7, and the second claw portion 42 is embedded in the other foam resin block 7. In the block installation process, the third claw portion 21 is arranged to straddle two laterally adjacent foam resin blocks 7. In the connector 1 embedded in the foam resin block 7, the upper end surface 201 of the connecting plate portion 2, the upper end surface 311 of the first anchor plate portion 31, and the upper end surface 321 of the second anchor plate portion 32 are at a height equal to or lower than the upper surface 71 of the foam resin block 7. In other words, the connector 1 does not protrude from the upper surface 71 of the foam resin block 7. Therefore, even when another foam resin block 7 is provided above the foam resin blocks 7 connected by the connector 1, the connector 1 does not interfere with installation, facilitating the installation of the foam resin block 7 to be installed above.

[0036] As shown in FIG. 7, in the concrete slab installation step, a concrete slab 6 is installed on the upper side of a foamed resin block 7.

[0037] In the concrete slab installation process, spikes 65 formed on the underside 63 of the precast concrete slab 61 are embedded in the upper surface 71 of the foam resin block 7. This allows the precast concrete slab 61 to be installed on the upper surface 71 of the foam resin block 7. Because the connectors 1 do not protrude from the upper surface 71 of the foam resin block 7, even when the precast concrete slab 61 is installed above the foam resin block 7, the connectors 1 do not get in the way, making it easy to install the precast concrete slab 61 directly. Furthermore, because the spikes 65 can be embedded in the foam resin block 7 while directly contacting the foam resin block, they provide significant slip resistance even in the event of seismic activity, preventing slippage between the foam resin block 7 and the concrete slab 6.

[0038] Furthermore, in the concrete slab installation process, the precast concrete slab 61 is installed so as to straddle adjacent foamed resin blocks 7 on either side. This allows adjacent foamed resin blocks 7 to be connected by the precast concrete slab 61. Therefore, even in the event of an earthquake, sliding between the foamed resin blocks 7 and the precast concrete slab 61 is further suppressed.

[0039] 2, in the concrete slab installation step, concrete is poured to the side of the precast concrete slab 61 to install a cast-in-place concrete slab 69. This completes the installation of the concrete slab 6.

[0040] 7, in the block installation step, a foamed resin block 7 is installed on the upper surface 62 of the precast concrete floor slab 61. At this time, the spikes 65 formed on the upper surface 62 are embedded in the foamed resin block 7.

[0041] In this way, the block installation step and the concrete slab installation step are repeatedly performed to install the concrete slab 6 as the upper slab.

[0042] In the panel installation process, for example, after installing the foamed resin blocks 7 to a predetermined height or after installing the concrete floor slab 6, the embankment panels 8 are installed on the pre-installed supports 81. This completes the method for constructing the embankment structure 100.

[0043] The method for constructing road 9 involves constructing embankment structure 100 and then constructing road 9 above embankment structure 100. In the method for constructing road 9, a ground cover 93 and a roadbed 91 are constructed above the uppermost concrete deck 6, which serves as the upper deck. Then, in the road construction process, a pavement 92 is constructed above the roadbed 91, and a wall parapet 94 is constructed above the ground cover 93. This completes the method for constructing road 9.

[0044] In this embodiment, the concrete slab 6 has a precast concrete slab 61, and the precast concrete slab 61 has spikes 65 formed thereon that are embedded in foam resin blocks 7. The spikes 65 dig into the foam resin blocks, thereby increasing the slip resistance of the precast concrete slab 61 against the foam resin blocks 7. Therefore, even in the event of seismic activity, slippage between the foam resin blocks 7 and the concrete slab 6 is suppressed. By enabling direct surface contact between the foam resin blocks 7 and the precast concrete slab 61 in this way, the spikes 65 installed on the contact surface of the precast concrete slab 61 exert even greater slip resistance, making it possible to build a more stable structure than ever before.

[0045] In this embodiment, the spikes 65 are formed with tapered portions 652. As a result, when the spikes 65 are embedded in the foam resin block 7, the embedded surfaces of the spikes 65 become pressure-receiving surfaces within the foam resin block, exerting shear resistance against external forces, compared to when the spikes 65 are roughened. This adds resistance to frictional resistance and increases slide resistance. Therefore, even in the event of seismic activity, the spikes 65 penetrate into the foam resin block, further suppressing sliding between the foam resin block 7 and the concrete slab 6. Furthermore, even if the top surface of the foam resin blocks 7 becomes uneven due to inaccuracies in stacking, the spikes 65 cross the gap and sink into contact with the foam resin blocks 7 before they are stacked, providing additional resistance to the spikes 65 to provide additional slide safety.

[0046] In this embodiment, the concrete slab 6 has a precast concrete slab 61. This allows the embankment structure 100 to be constructed on-site more easily than a cast-in-place concrete slab. Furthermore, since the precast concrete slab 61 can be made higher quality and stronger than a cast-in-place concrete slab, it is possible to make the thickness of the precast concrete slab 61 thinner than the thickness of a cast-in-place concrete slab. This allows the embankment structure 100 to be made even lighter.

[0047] In this embodiment, the connector 1 has a plate-shaped connecting plate 2, a first anchor plate 31 formed by bending one side end of the connecting plate 2, a second anchor plate 32 formed by bending the other side end of the connecting plate 2, a first claw 41 protruding downward so that the end face of the bent portion between the connecting plate 2 and the first anchor plate 31 becomes a peak 41a, and a second claw 42 protruding downward so that the end face of the bent portion between the connecting plate 2 and the second anchor plate 32 becomes a peak 42a. This allows the connector 1 to be easily inserted into the foamed resin block 7, making it easier to connect the foamed resin blocks 7 to each other.

[0048] In this embodiment, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are flush. Therefore, when the connector 1 is inserted into the foamed resin block 7, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are at a height equal to or lower than the upper surface 71 of the foamed resin block 7. This prevents the metal fittings from being exposed to the upper surface and allows direct contact between the foamed resin block 7 and the concrete slab 6, thereby increasing the slip resistance between the foamed resin block 7 and the concrete slab 6. Therefore, even in the event of seismic activity, slippage between the foamed resin block 7 and the concrete slab 6 is suppressed. Furthermore, even when an overlying member, such as a precast concrete slab 61 or a foamed resin block 7, is installed above the foamed resin block 7, the connector 1 can connect the foamed resin blocks 7 to each other. Therefore, slippage between the foamed resin blocks 7 is suppressed even in the event of seismic activity. Thus, compared to the conventional fastening fitting of Patent Document 1, the connector 1 has a structure in which it is embedded deeply in the foamed resin block 7, which also has the effect of improving the fastening force between the foamed resin blocks 7 more than before.

[0049] Furthermore, in this embodiment, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are flush. As a result, when the connector 1 is inserted into the foamed resin block 7, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are at a height equal to or lower than the upper surface 71 of the foamed resin block 7. In this way, the connector is not exposed on the upper side of the foamed resin block, so that an overlying member such as a concrete slab 6 can be directly installed on the foamed resin block 7. Direct frictional resistance between the foamed resin block 7 and the overlying member is ensured, which enables labor-saving construction of embankments through mechanized construction by precasting the concrete slab.

[0050] In this embodiment, the precast concrete slab 61 is arranged across multiple foamed resin blocks 7. As a result, adjacent foamed resin blocks 7 are connected to each other by the precast concrete slab 61. Therefore, even in the event of earthquake motion, sliding between the foamed resin blocks 7 and the concrete slab 6 is further suppressed.

[0051] In this embodiment, the spike 65 has a columnar portion 651 extending in a columnar shape from the main surface of the precast concrete floor slab 61, and a tapered portion 652 formed in a cone shape at the tip of the columnar portion 651. This makes it easier to insert the spike 65 into the foamed resin block 7.

[0052] In this embodiment, a concrete slab 6 and a foamed resin block 7 are exemplified as examples of the upper member to be placed on the foamed resin block 7 on which the connector 1 is provided, but the upper member to be placed on the foamed resin block 7 on which the connector 1 is provided may also be grass, a polyethylene sheet, etc.

[0053] <Second embodiment: embankment structure 100> 8 and 9, the embankment structure 100 in the second embodiment differs from the first embodiment mainly in that a plurality of concrete slabs 6 are spaced apart in the extension direction so that spaces S are formed between them. Detailed explanations of the same configurations as those in the first embodiment will be omitted below.

[0054] The embankment structure 100 is a lightweight embankment structure in which a plurality of foam resin blocks 7 for embankment are stacked. A road 9 is provided on the upper side of the embankment structure 100 as a superstructure. The embankment structure 100 comprises foam resin blocks 7, a concrete slab 6, embankment panels 8, and connectors 1. The embankment structure 100 has a concrete slab 6 as an upper slab provided between the road 9 and the foam resin blocks 7, and a concrete slab 6 as an intermediate slab provided between the foam resin blocks 7 arranged above and below. The embankment structure 100 has embankment panels 8 provided on both sides in the width direction, sandwiching the plurality of arranged foam resin blocks 7.

[0055] The embankment structure 100 is constructed in the extension direction, for example, between a natural ground 95 serving as a support for supporting an upper structure and an abutment 96. The road 9 is supported from below by the natural ground 95 and the abutment 96. Although not shown in the figures, the embankment structure 100 may also be constructed in the extension direction, for example, between a pier and an abutment serving as a support, or between piers serving as supports.

[0056] The concrete slabs 6 are provided spaced apart laterally from each other in the extension direction of the embankment structure 100. A space S is formed between the two laterally spaced concrete slabs 6. As a result, even when external forces such as earthquake motion or earth pressure from the ground 95 occur, the space S allows the concrete slabs 6 to move, reducing the external force transmitted between the concrete slabs 6. This reduces the force transmitted from the concrete slabs 6 to the abutments 96, thereby minimizing the impact on the abutments 96. Note that in the example of FIG. 9 , precast concrete slabs 61 are used as the concrete slabs 6 on both sides of the space S, but cast-in-place concrete slabs 69 may also be used as the concrete slabs 6 on both sides of the space S.

[0057] The embankment structure 100 is further provided with a protective plate material 66. The protective plate material 66 is provided across the upper surfaces 62 of two laterally spaced concrete slabs 6. The protective plate material 66 is made of, for example, a steel plate. The protective plate material 66 is provided on the concrete slab 6 below the roadbed 91. The protective plate material 66 is intended to prevent the roadbed 91 provided above from invading the space S. The protective plate material 66 is fixed to one of the two laterally adjacent concrete slabs 6 by a fixing member 661, for example, an anchor bolt.

[0058] In the embankment structure 100, a drainage pipe 67 for draining rainwater is provided between two laterally spaced concrete slabs 6. The drainage pipe 67 is provided in the space S and has a U-shaped cross section that is open at the top. The drainage pipe 67 is provided below the protective plate material 66. The drainage pipe 67 is configured to be elastically deformable and is made of, for example, polyvinyl chloride or a corrosion-resistant stainless steel thin plate. The portion of the drainage pipe 67 that is bent outward at the top end of the U-shaped cross section is installed on the side surface 64 of the precast concrete slab 61. In this way, the drainage pipe 67 is fixed to the two precast concrete slabs 61.

[0059] As shown in Figure 10, the drainage pipe 67 is extended toward the widthwise end of the embankment structure 100. As a result, even if rainwater that has fallen on the pavement 92 or oil spilled due to an accident or the like reaches the drainage pipe 67 through the roadbed 91, the rainwater can be drained through the drainage pipe 67 toward the widthwise end of the embankment structure 100.

[0060] In the embankment structure 100, oil-proof sheets 68 may be further provided on the upper side of the uppermost concrete slab 6 and on the upper side of the protective plate material 66. In this way, the oil-proof sheets 68 can prevent oily rainwater that falls on the pavement 92 and penetrates into the roadbed 91 from reaching the foamed resin blocks 7. This makes it possible to prevent unexpected damage, such as dissolution of the foamed resin blocks 7 by oily rainwater. The oil-proof sheets 68 are made of, for example, polyethylene. The oil-proof sheets 68 are provided on the underside of the roadbed 91.

[0061] <Second embodiment: Method for constructing embankment structure 100> The construction method for the embankment structure 100 is an embankment construction method that uses foamed resin blocks 7 for the embankment and a concrete slab 6 that is placed on the foamed resin blocks 7. The construction method for the embankment structure 100 involves placing the concrete slab 6 on top of a plurality of foamed resin blocks 7 that are lined up side by side. The construction method for the embankment structure 100 includes, for example, a block installation process, a concrete slab installation process, and a panel installation process.

[0062] As in the first embodiment, the block installing step and the concrete slab installing step are repeatedly performed to install the concrete slab 6 as the upper slab.

[0063] In the concrete slab installation process, when a concrete slab 6 is installed as an upper slab on top of the foamed resin block 7, the concrete slabs 6 are installed spaced apart to the sides so that a space S is formed between the two concrete slabs 6.

[0064] In the concrete slab installation process, a drainage pipe 67 is provided between two concrete slabs 6 spaced apart laterally.

[0065] In the concrete slab installation process, a protective plate 66 is provided across the upper surfaces 62 of two laterally spaced apart concrete slabs 6. At this time, the protective plate 66 is fixed to one of the two laterally spaced apart concrete slabs 6 by a fixing member 661.

[0066] In the concrete slab installation process, an oil-proof sheet 68 is installed so as to cover the concrete slab 6 and the protective plate material 66 .

[0067] In the panel installation process, for example, after installing the foamed resin blocks 7 to a predetermined height or after installing the concrete floor slab 6, the embankment panels 8 are installed on the pre-installed supports 81. This completes the method for constructing the embankment structure 100.

[0068] Conventional embankment structures consist of multiple concrete slabs laid tightly on top of foam resin blocks in contact with the abutments. For this reason, when conventional embankment structures are installed between the natural ground and the abutments, external forces such as earthquake motion and earth pressure from the natural ground are transmitted from the concrete slabs to the abutments, which has raised concerns that these forces could affect the abutments, and countermeasures are being sought.

[0069] In this regard, in this embodiment, the multiple concrete slabs 6 are provided spaced apart from one another on the sides, and a space S is formed between two laterally spaced concrete slabs 6. This reduces the force transmitted between the concrete slabs 6 even when an external force such as earthquake motion or earth pressure from the ground 95 occurs. Therefore, the force transmitted from the concrete slabs 6 to the abutment 96 is suppressed, and the impact on the abutment 96 is suppressed.

[0070] This embodiment includes a protective plate 66 that is provided across the upper surfaces 62 of two laterally spaced concrete slabs 6. This prevents the roadbed 91 above the protective plate 66 from intruding into the space S. Therefore, even if the concrete slabs 6 are spaced apart from each other, the roadbed 91 is constructed on the upper side.

[0071] In this embodiment, the protective plate material 66 is fixed to one of two laterally spaced concrete slabs 6. This reduces the force transmitted between the concrete slabs 6 even when external forces such as earthquake motion or earth pressure from the ground 95 occur. This reduces the force transmitted from the concrete slabs 6 to the abutment 96, thereby suppressing the impact on the abutment 96.

[0072] In this embodiment, the precast concrete slab 61 is formed with spikes 65 embedded in the foam resin blocks 7. This provides additional sliding resistance from the spikes in addition to friction, so that even when external forces such as earthquake motion or earth pressure from the ground 95 occur, movement of the precast concrete slab 61 is suppressed and the space S can be maintained. Furthermore, external forces such as earthquake motion and earth pressure from the ground 95 are transmitted to the foam resin blocks 7 by the spikes 65. The force transmitted between the concrete slabs 6 is reduced due to the energy attenuation and dispersion effect caused by slight deformation of the pressure-receiving portions of the spikes 65 of the foam resin blocks 7, which are elastic bodies. As a result, the force transmitted from the concrete slab 6 to the abutments 96 is suppressed, and the transmission of load to the abutments 96 is suppressed.

[0073] In this embodiment, a drain pipe 67 is provided between two laterally spaced concrete slabs 6. As a result, even if rainwater that falls on a pavement 92 such as asphalt or oil spilled due to an accident or the like reaches the drain pipe 67 through the roadbed 91, the oily water is drained through the drain pipe 67 toward the end of the embankment structure 100 in the width direction. This makes it possible to prevent unexpected damage, such as dissolution of the foamed resin blocks 7 due to oil contained in rainwater or the like.

[0074] In this embodiment, the drain pipe 67 is formed with a U-shaped cross section that is open at the top, thereby allowing rainwater to be efficiently drained.

[0075] In this embodiment, the drain pipe 67 is configured to be elastically deformable. This allows a buffering effect to be exerted between the two separated concrete slabs 6. This reduces the effects of load transmission to the abutment 96, etc.

[0076] (Third embodiment: embankment structure 100) As shown in FIG. 11, the connector 1 used in the embankment structure 100 in the third embodiment differs from that in the first embodiment mainly in that the third claw portion 21 and the protrusions 415, 425 are omitted.

[0077] The connector 1 has a plate-shaped connecting plate portion 2, a first anchor plate portion 31, a second anchor plate portion 32, a first claw portion 41, and a second claw portion .

[0078] In this embodiment, the connector 1 includes a plate-shaped connecting plate 2, a first anchor plate 31 formed by bending one side end of the connecting plate 2, a second anchor plate 32 formed by bending the other side end of the connecting plate 2, a first claw 41 that protrudes downward so that the end face of the bent portion between the connecting plate 2 and the first anchor plate 31 becomes a peak 41a, and a second claw 42 that protrudes downward so that the end face of the bent portion between the connecting plate 2 and the second anchor plate 32 becomes a peak 42a. This allows the connector 1 to be easily inserted into the foamed resin block 7 by hammering. This makes it easier to connect the foamed resin blocks 7 to each other.

[0079] In this embodiment, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are flush. Therefore, when the connector 1 is inserted into the foamed resin block 7, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are at a height equal to or lower than the upper surface 71 of the foamed resin block 7. This allows the concrete slab 6 to be in direct surface contact with the foamed resin block 7, thereby increasing the slip resistance between the foamed resin block 7 and the concrete slab 6. Therefore, even in the event of seismic motion, slippage between the foamed resin block 7 and the concrete slab 6 is suppressed. Furthermore, even when an overlying member such as a precast concrete slab 61 or a foamed resin block 7 is installed above the foamed resin block 7, the foamed resin blocks 7 are connected to each other by the connector 1. Therefore, even in the event of seismic motion, slippage between the foamed resin blocks 7 is suppressed. Thus, compared to the conventional fastening fitting of Patent Document 1, the connector 1 has a structure in which it is embedded deeply in the foamed resin block 7, which also has the effect of improving the fastening force between the foamed resin blocks 7 more than before.

[0080] Furthermore, in this embodiment, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are flush. As a result, when the connector 1 is inserted into the foamed resin block 7, the upper end surface 201 of the connecting plate 2, the upper end surface 311 of the first anchor plate 31, and the upper end surface 321 of the second anchor plate 32 are at a height equal to or lower than the upper surface 71 of the foamed resin block 7. In this way, the connector is not exposed on the upper side of the foamed resin block, so that an overlying member such as a concrete slab 6 can be directly installed on the foamed resin block 7. Direct frictional resistance between the foamed resin block 7 and the overlying member is ensured, resulting in stability, and thus labor-saving construction of embankments through mechanized construction by precasting the concrete slab.

[0081] (Fourth embodiment: embankment structure 100) As shown in FIG. 12, the connector 1 used in the embankment structure 100 in the fourth embodiment differs from the first embodiment mainly in that the central portion of the connector plate portion 2 is bent into a V shape in plan view.

[0082] The second anchor plate 32 is formed by bending the other side end portion to the same side as the first anchor plate 31, using the surface along the connecting plate 2 as the reference plane. In other words, the second anchor plate 32 is positioned opposite the first anchor plate 31. This further prevents the connector 1 from sliding sideways when the first anchor plate 31 and the second anchor plate 32 are embedded in the foam resin block 7.

[0083] Third claw 21 is bent into a V-shape in plan view, and protrudes downward so that the end face of the bent V-shape in plan view becomes apex 21a. Third claw 21 has a pair of inclined portions 211 and 212 formed on both sides of apex 21a, a vertical portion 213 extending vertically from inclined portion 211, and a vertical portion 214 extending vertically from inclined portion 212. This ensures that connector 1 has sufficient cross-sectional strength to withstand being hammered in by impact, making it easier to insert into foamed resin block 7.

[0084] (Fifth embodiment: embankment structure 100) 13(a) and 13(b), the fifth embodiment differs from the first embodiment mainly in that the plurality of spikes 65 of the precast concrete slab 61 used in the embankment structure 100 in the fifth embodiment are arranged in a circular ring shape. Below, an example in which the spikes 65 are formed on the lower surface 63 will be described, but the spikes 65 may also be formed on the upper surface 62 of the concrete slab 6.

[0085] The spikes 65 are arranged in a circular ring shape. Slits 659 are formed between each pair of spikes 65. Even if dust or other debris enters the area surrounded by the spikes 65 during curing or temporary placement on site during the manufacture of the precast concrete slab 61, the debris can be quickly removed through the slits 659 by spraying water or sweeping toward the spikes 65. The spikes 65 have tips 655. The outer side of the area surrounded by the spikes 65 and the inner side of the area surrounded by the spikes 65 are uniformly inclined so as to approach each other in the direction toward the tips 655. This makes it easier to insert the precast concrete slab 61 into the foam resin block 7. The tips 655 are formed as flat surfaces parallel to the horizontal. The tips 655 may be formed as lines rather than surfaces.

[0086] (Sixth embodiment: embankment structure 100) As shown in FIG. 14(a), the sixth embodiment differs from the first embodiment mainly in that the plurality of spikes 65 of the precast concrete slab 61 used in the embankment structure 100 in the sixth embodiment are arranged in a circular ring shape.

[0087] The multiple spikes 65 are arranged in a ring shape. Slits 659 are formed between each of the spikes 65. The outer side of the area surrounded by the multiple spikes 65 is formed as a vertical plane perpendicular to the horizontal. The inner side of the area surrounded by the multiple spikes 65 is formed as an inclined plane that is uniformly inclined toward the outer side in the direction toward the tip 655. This makes it easier to insert the precast concrete slab 61 into the foam resin block 7. The tip 655 is formed as a flat plane parallel to the horizontal. Note that the tip 655 may be formed as a line instead of a surface.

[0088] (Seventh embodiment: embankment structure 100) 14(b), the seventh embodiment differs from the first embodiment mainly in that the multiple spikes 65 of the precast concrete slab 61 used in the embankment structure 100 in the seventh embodiment are arranged in a circular ring shape. Below, an example in which the spikes 65 are formed on the lower surface 63 will be described, but the spikes 65 may also be formed on the upper surface 62 of the concrete slab 6.

[0089] The spikes 65 are arranged in a circular ring shape. Slits 659 are formed between each pair of spikes 65. The outer surface of the area surrounded by the spikes 65 is formed as a uniformly inclined surface that slopes toward the inner side surface of the area surrounded by the spikes 65 in the direction toward the tip 655. This makes it easier to insert the precast concrete slab 61 into the foam resin block 7. The inner side surface of the area surrounded by the spikes 65 is formed as a vertical surface that is perpendicular to the horizontal. The tip 655 is formed as a flat surface that is parallel to the horizontal. The tip 655 may be formed as a line instead of a surface.

[0090] (Eighth embodiment: embankment structure 100) 15(a) and 15(b), the spikes 65 of the precast concrete slab 61 used in the embankment structure 100 in the eighth embodiment are mainly different from those in the first embodiment in that they are formed in a truncated cone shape. Below, an example in which the spikes 65 are formed on the lower surface 63 will be described, but the spikes 65 may also be formed on the upper surface 62 of the concrete slab 6.

[0091] The spike 65 has a tapered portion 656 formed in a truncated cone shape and a tip portion 655. The outer surface of the tapered portion 656 is curved so that it gradually rises as it approaches the tip portion 655. This makes it easier to insert the precast concrete floor slab 61 into the foam resin block 7. The tip portion 655 is formed in a circular shape when viewed from the bottom. The tip portion 655 is formed as a flat surface parallel to the horizontal. The tip portion 655 may be formed as a point rather than a surface. In this case, the spike 65 has a tapered portion 656 formed in a conical shape.

[0092] (Ninth embodiment: embankment structure 100) As shown in Fig. 16, the connector 1 used in the embankment structure 100 of the ninth embodiment differs from that of the first embodiment mainly in that it is formed with a protrusion 415 and a protrusion 425. The protrusion 415 and the protrusion 425 are formed, for example, in a triangular shape. Note that the protrusion 415 and the protrusion 425 may also be formed, for example, in a rectangular shape.

[0093] The protrusions 415 are formed on the vertical portions 413 and 414 of the first claw portion 41 and on the first anchor plate portion 31. This makes it possible to prevent the connector 1 from being pulled out of the foam resin block 7.

[0094] The protrusions 425 are formed on the vertical portions 423 and 424 of the second claw portion 42 and on the second anchor plate portion 32. This makes it possible to prevent the connector 1 from being pulled out of the foam resin block 7.

[0095] Although not shown, third claw 21 may have protrusions formed on vertical portion 213 and vertical portion 214. This can prevent connector 1 from being pulled out of foamed resin block 7. The protrusions formed on vertical portion 213 and vertical portion 214 are formed in, for example, a triangular or rectangular shape.

[0096] (Tenth embodiment: embankment structure 100) As shown in FIG. 17, the embankment structure 100 in the tenth embodiment differs from the first embodiment mainly in that the precast concrete floor slab 61 is provided so as to protrude beyond the embankment panel 8.

[0097] In the embankment structure 100, the support posts 81 are omitted, and the embankment panels 8 are attached to the foam resin blocks 7 via mounting fixtures 85. Part of the mounting fixtures 85 is embedded in the foam resin blocks 7, allowing the embankment panels 8 to be attached to the front side of the foam resin blocks 7.

[0098] The embankment structure 100 is provided such that the uppermost precast concrete slab 61 protrudes from the embankment panel 8.

[0099] In the embankment structure 100, a precast concrete slab 61 is provided as an intermediate slab between the upper and lower foam resin blocks 7. The sides of the precast concrete slab 61 as an intermediate slab are exposed. This eliminates the need for residual formwork or cast-in-place concrete slabs, thereby reducing the need for external scaffolding and other construction labor.

[0100] In this embodiment, the precast concrete slab 61 is provided to overhang the embankment panel 8. This makes it possible to prevent the embankment panel 8 from being soiled by raindrops and the like. Furthermore, the overhanging finish of the precast concrete slab 61 can absorb construction errors in the foam resin blocks 7, creating a uniform finished surface. Furthermore, overhanging construction of the precast concrete slab 61 is possible without scaffolding, which can reduce the labor required for construction such as overhanging sidewalks.

[0101] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0102] 100: Embankment structure 1: Connector 2: Connecting plate part 201: Upper end surface 202: Bottom end surface 21: Third claw part 21a: Top 211: Inclined part 212: Inclined part 213: Vertical section 214: Vertical section 31: First anchor plate 311: Upper end surface 32: Second anchor plate 321: Upper end surface 41: 1st claw part 41a: Top 411: Inclined part 412: Inclined part 413: Vertical section 414: Vertical section 415:Protrusion 42:Second claw part 42a: Top 421: Inclined part 422: Inclined part 423: Vertical section 424: Vertical section 425:Protrusion 6: Concrete deck 61: Precast concrete deck 62:Top surface 63: Bottom surface 64: Side 65: Spike 651: Columnar part 652: Tapered section 66: Protective plate material 661: Fixing member 67: Drain pipe 68: Oil-proof sheet 69: Cast-in-place concrete deck 7: Foam resin block 71:Top surface 72: Bottom surface 8: Embankment panel 81: Strut 82: Mounting fixture 83: Anchor member 84: Holding member 9: Road 91: Roadbed 92: Pavement 93: Earth cover 94: Wall parapet 95: Ground 96: Abutment

Claims

1. An embankment structure comprising a foamed resin block for embankment and a concrete slab provided on the foamed resin block, the concrete slab comprises a precast concrete slab; The precast concrete floor slab has spikes embedded in the foam resin blocks on at least one of the upper and lower surfaces that come into contact with the foam resin blocks. An embankment structure characterized by:

2. The precast concrete slab has the spikes on its underside.

2. The embankment structure according to claim 1, wherein:

3. The precast concrete slab has the spikes on its upper surface.

3. The embankment structure according to claim 1 or 2, characterized in that:

4. The spikes are formed by roughening the surface of the precast concrete floor slab.

2. The embankment structure according to claim 1, wherein:

5. The spikes are formed to protrude in a predetermined shape.

2. The embankment structure according to claim 1, wherein:

6. A plurality of the foam resin blocks; a connector that connects the foamed resin blocks to each other, The connector is A plate-shaped connecting plate portion; a first anchor plate portion formed by bending one side end portion of the connecting plate portion; a second anchor plate portion formed by bending the other side end portion of the connecting plate portion; a first claw portion that protrudes downward so that an end surface of a bent portion between the connecting plate portion and the first anchor plate portion becomes a peak; a second claw portion that protrudes downward so that an end surface of a bent portion between the connecting plate portion and the second anchor plate portion becomes a peak, The upper end surface of the connecting plate portion, the upper end surface of the first anchor plate portion, and the upper end surface of the second anchor plate portion are formed flush with each other.

2. The embankment structure according to claim 1, wherein:

7. A precast concrete deck installed on foam resin blocks for embankment, At least one of the upper and lower surfaces that come into contact with the foamed resin block has spikes to be embedded in the foamed resin block. Precast concrete deck slab characterized by:

8. A method for constructing an embankment structure comprising a foamed resin block for embankment and a concrete slab provided on the foamed resin block, the concrete slab comprises a precast concrete slab; The precast concrete floor slab has spikes on at least one of the upper and lower surfaces, and the spikes are embedded in the foam resin blocks. A method for constructing an embankment structure characterized by the above.

9. Embedding the spikes on the underside of the precast concrete slab into the foam resin blocks.

9. The method for constructing an embankment structure according to claim 8,

10. Embedding the spikes on the top surface of the precast concrete slab into the foam resin blocks.

9. The method for constructing an embankment structure according to claim 8,

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