TWI727831B - Lightweight fill structure - Google Patents

Abstract

The light-weight filling structure 10 series is equipped with: a filling part, which is composed of a plurality of layers of foam blocks; a floor part, which is installed between the adjacent foam blocks above and below, or is installed on the upper surface of the filling part And the side wall part 8c, which covers the outer side of the filling part and the outer side of the floor part; the floor part has: a concrete layer, which is cast in a planar manner; and a resin block, which is made of polypropylene It is constructed and arranged to be adjacent to the concrete layer in the surface direction.

Description

Lightweight fill structure

The present invention relates to a lightweight filling structure.

As disclosed in Japanese Unexamined Patent Publication No. 11-241343, in soil pressure resistant structures such as retaining walls or abutments, in order to reduce the pressure (earth pressure) acting on the back side of the structure, Lightweight filling structure. By replacing the soil with a lighter foaming body block on the back side of the structure, the soil pressure can be reduced, thereby shortening the construction period and improving the earthquake resistance.

In the light-weight filling structure, foam blocks are layered and a concrete floor is laid. For example, a concrete floor with a thickness of about 10 cm to 15 cm is laid every 3 m from the lower part of the foam block. The presence of the concrete floor can disperse the vehicle load or paving load. The vehicle load and paving load are the load from the upper part of the laminated foam block. Even if the oil dissolved in the foam block leaks out on the road, it can protect the foam block from the oil due to the presence of the concrete floor.

In the event that a large-scale earthquake occurs around earth pressure resistant structures such as retaining walls or bridge abutments, the concrete floor can press the side walls of the bridge abutments with strong force. Due to the influence of the earthquake, the soil that is further present on the back side of the laminated foam block may act as soil pressure and indirectly act on the side wall of a bridge abutment and the like via the concrete floor.

In order to alleviate the situation where the concrete floor intensively presses the side wall of the abutment or the like, it is considered to arrange a buffer material between the side wall of the abutment or the like and the concrete floor. As the material of the cushioning material, the same polystyrene as the foam block can be considered. However, when polystyrene is used, the cushioning material made of polystyrene is compressed between the side wall of abutment, etc. and the concrete floor. As a result, a part of the cushioning material will undergo plastic deformation (plastic deformation). Moreover, it is believed that polystyrene will easily dissolve due to contact with petroleum.

The present invention was created in view of the above-mentioned actual situation, and the purpose is to provide a lightweight filling structure, which is less prone to plastic deformation and has more oil resistance, so that it can function as a lightweight filling for a longer time. .

The lightweight filling structure system based on the present invention is provided with: the filling part is composed of a plurality of laminated foam blocks; the floor part is arranged between the above-mentioned foam blocks adjacent to each other, or is arranged in the above-mentioned filling On the upper surface of the soil part; and the side wall part, which covers the outer side surface of the filling part and the outer side surface of the floor part; the floor part has: a concrete layer which is cast in a manner extending into a plane; and The resin block is made of polypropylene and is arranged adjacent to the aforementioned concrete layer in the plane direction.

In the aforementioned light-weight filling structure, the aforementioned resin block may be provided between the aforementioned side wall portion and the aforementioned concrete layer.

In the aforementioned lightweight filling structure, the aforementioned concrete layer may also include: a first concrete part; and a second concrete part arranged on the opposite side of the aforementioned side wall part with respect to the aforementioned first concrete part; the aforementioned resin block may also be provided Between the first concrete part and the second concrete part.

The aforementioned lightweight filling structure can also be further equipped with upper and lower double claw type fastening metal fittings; the aforementioned fastening metal fittings can also be arranged between the lower surface of the resin block and the foam block on the lower side, and/or Between the upper surface of the resin block and the foam block on the upper side.

Based on the following detailed description of the present invention understood in conjunction with the accompanying drawings, the above and other objects, features, aspects and advantages of the present invention can be understood.

Hereinafter, a mode for implementing the invention will be described with reference to the drawings. In the following description, the same component or corresponding component may be labeled with the same reference symbol, and the description will not be repeated.

[Lightweight Fill Structure 10] 1 and 2 illustrate the lightweight filling structure 10 in the embodiment. The lightweight filling structure 10 is used, for example, to construct a bridge along the slope of a mountainous area. FIG. 1 is a cross-sectional view showing the lightweight filling structure 10 in the embodiment, and FIG. 2 is an enlarged cross-sectional view showing the area enclosed by the II line in FIG. 1.

As shown in FIGS. 1 and 2, the abutment 8 for supporting the bridge 20 is erected on the ground 7, and the light-weight filling structure 10 is formed on the back side of the abutment 8 (the side of the soil 9 as viewed from the abutment 8 ). The abutment 8 has a pedestal portion 8a and a pillar portion 8b, and a side wall portion 8c is formed on the side of the pillar portion 8b. The lightweight filling structure 10 includes a lower filling part 1, a middle floor part 2, an upper filling part 3, an upper floor part 4, and a fastening metal fitting 6 (refer to FIG. 3). The lightweight filling structure 10 is installed at Between the abutment 8 (the side wall portion 8c of the pillar portion 8b) and the soil 9. The lower filling part 1, the middle floor part 2, the upper filling part 3, the upper floor part 4, the road plate 5a, and the pavement 5b are sequentially laminated. The soil 9 (backfill) is installed between the lower filling part 1 and the inclined surface and between the upper filling part 3 and the inclined surface.

The fastening metal fitting 6 (FIG. 3) is an upper and lower double claw type, and has a flat plate portion 6P, a plurality of lower claw portions 6S, and a plurality of upper claw portions 6U. The flat plate portion 6P has a square shape in a plan view. A plurality of lower claw portions 6S extends downward from the four sides of the flat plate portion 6P, and a plurality of upper claw portions 6U extends upward from the four sides of the flat plate portion 6P. The flat plate portion 6P may have a polygonal shape such as a rectangle, a circular shape, an oval shape, or the like in a plan view.

[Lower Fill Part 1] As shown in FIG. 1 and FIG. 2, the lower filling portion 1 is laminated with a plurality of foam blocks 1 a, and is constituted by using a plurality of fastening metal fittings 6 to fasten the plurality of foam blocks 1 a to each other. For example, the fastening metal part 6 is a fastening metal part of the upper and lower double claw type. The plural foam blocks 1a are made of the same material (for example, polystyrene), and foam blocks that are only appropriately different in size are used. The outer side of the lower filling portion 1 located on the left side of the paper is covered by the side wall portion 8c of the abutment 8. The outer surface of the lower filling portion 1 is arranged so as to contact the side wall portion 8c of the abutment 8.

[Middle floor part 2] As shown in FIG. 2, the middle floor part 2 is provided on the upper surface of the lower filling part 1. The middle floor portion 2 is located between the foam blocks 1a and 3a adjacent to each other up and down. The middle floor portion 2 stabilizes the layered state of the lower soil filling portion 1 and disperses the load acting on the middle floor portion 2 in the in-plane direction, thereby improving the overall strength of the lightweight soil filling structure 10.

The intermediate floor portion 2 of the present embodiment includes an end resin block 2a, a concrete layer 2b (first concrete portion), an intermediate resin block 2c, and a concrete layer 2d (second concrete portion). The end resin block 2a and the concrete layer 2b are adjacent to each other in the surface direction, the concrete layer 2b and the intermediate resin block 2c are adjacent to each other in the surface direction, and the intermediate resin block 2c and the concrete layer 2d are adjacent to each other in the surface direction. adjacent.

The intermediate resin block 2c is provided between the concrete layer 2b and the concrete layer 2d. Both the end resin block 2a and the middle resin block 2c are made of polypropylene (PP).

The end resin block 2a has a shape extending in the vertical direction with respect to the paper surface of FIGS. 1 and 2. The end resin block 2a is provided between the side wall portion 8c of the bridge abutment 8 and the concrete layer 2b. Typically, the end resin block 2a has a rectangular parallelepiped shape, and the thickness of the end resin block 2a is about 10 cm to 15 cm. The outer side surface of the end resin block 2a located on the left side of the paper is covered by the side wall 8c of the bridge abutment 8.

The outer surface of the end resin block 2a is arranged so as to contact the side wall portion 8c of the abutment 8. The lower surface of the end resin block 2a can be fixed to the foam block 1a of the uppermost layer of the lower filling part 1 by the upper and lower double claw type fastening metal fittings 6. The end resin block 2a serves as a part of the mold to make the concrete layer 2b easy to cast. The upper surface of the end resin block 2a may also be fixed to the foam block 3a of the lowermost layer of the upper filling part 3 by the upper and lower double claw type fastening metal fittings 6.

Like the end resin block 2a, the middle resin block 2c also has a shape extending in the vertical direction with respect to the paper surface of FIG. 1. The middle resin block 2c is arranged on the opposite side of the side wall 8c with respect to the end resin block 2a. Typically, the middle resin block 2c has a rectangular parallelepiped shape, and the thickness of the middle resin block 2c is about 10 cm to 15 cm. The lower surface of the intermediate resin block 2c can be fixed to the foam block 1a of the uppermost layer of the lower filling part 1 by the upper and lower double claw type fastening metal fittings 6. The intermediate resin block 2c as a part of the mold frame enables the concrete layers 2b and 2d to be easily poured. The upper surface of the intermediate resin block 2c may be fixed to the foam block 3a of the lowermost layer of the upper filling part 3 by the upper and lower double claw type fastening metal fittings 6.

The concrete is poured on the upper surface of the lower filling part 1 at positions where the end resin blocks 2a and the middle resin blocks 2c are not provided, whereby the concrete layer 2b (first concrete part) and the concrete layer 2d (second concrete The portion) can be formed to extend into a planar shape. An intermediate resin block 2c is provided between the concrete layer 2b and the concrete layer 2d. The concrete layer 2b and the concrete layer 2d are preferably completely divided by the intermediate resin block 2c. The concrete layer 2b and the concrete layer 2d may be partially connected.

[Upper fill part 3] The upper filling part 3 on the middle floor part 2 is laminated with a plurality of foam blocks 3a, and the foam blocks 3a are fastened to each other by using a plurality of fastening metal fittings 6. For example, the fastening metal part 6 is a fastening metal part of the upper and lower double claw type. The plural foam blocks 1a and 3a are made of the same material (for example, polystyrene), and foam blocks that are only appropriately different in size are used. The outer surface of the upper filling part 3 on the left side of the paper is covered by the side wall part 8c of the abutment 8. The outer surface of the upper filling portion 3 is arranged so as to contact the side wall portion 8c of the abutment 8.

[Upper floor part 4] As shown in FIG. 2, the upper floor part 4 is provided on the upper surface of the upper filling part 3. On the upper floor portion 4, a road plate 5a and a pavement 5b are formed. The upper floor portion 4 stabilizes the layered state of the upper soil filling portion 3 and disperses the load acting on the upper floor portion 4 in the in-plane direction, thereby improving the overall strength of the lightweight soil filling structure 10.

The upper floor portion 4 of this embodiment includes an end resin block 4a, a concrete layer 4b (first concrete portion), an intermediate resin block 4c, and a concrete layer 4d (second concrete portion). The end resin block 4a and the concrete layer 4b are adjacent to each other in the surface direction, the concrete layer 4b and the intermediate resin block 4c are adjacent to each other in the surface direction, and the intermediate resin block 4c and the concrete layer 4d are adjacent to each other in the surface direction. adjacent.

The intermediate resin block 4c is provided between the concrete layer 4b and the concrete layer 4d. Both the end resin block 4a and the middle resin block 4c are made of polypropylene (PP).

The end resin block 4a has a shape extending in the vertical direction with respect to the paper surface of FIGS. 1 and 2. The end resin block 4a is provided between the side wall portion 8c of the bridge abutment 8 and the concrete layer 4b. Typically, the end resin block 4a has a rectangular parallelepiped shape, and the thickness of the end resin block 4a is about 10 cm to 15 cm. The outer side surface of the end resin block 4a on the left side of the paper is covered by the side wall portion 8c of the bridge abutment 8.

The outer surface of the end resin block 4a is arranged so as to contact the side wall portion 8c of the abutment 8. The lower surface of the end resin block 4a can be fixed to the foam block 3a of the uppermost layer of the upper filling part 3 by the upper and lower double claw type fastening metal fittings 6. The end resin block 4a as a part of the mold frame enables the concrete layer 4b to be easily poured. The upper surface of the end resin block 4a may also be fixed to the road plate 5a by the upper and lower double claw type fastening metal fittings 6.

Like the end resin block 4a, the middle resin block 4c also has a shape extending in the vertical direction with respect to the paper surface of FIG. 1. The intermediate resin block 4c is arranged on the opposite side of the side wall 8c with respect to the end resin block 4a. Typically, the intermediate resin block 4c has a rectangular parallelepiped shape, and the thickness of the intermediate resin block 4c is about 10 cm to 15 cm. The lower surface of the intermediate resin block 4c can be fixed to the foam block 3a of the uppermost layer of the upper filling part 3 by the upper and lower double claw type fastening metal fittings 6. The intermediate resin block 4c as a part of the mold frame enables the concrete layers 4b and 4d to be easily poured. The upper surface of the intermediate resin block 4c may also be fixed to the road plate 5a by the upper and lower double claw type fastening metal fittings 6.

The concrete is poured on the upper surface of the upper filling part 3 at positions where the end resin blocks 4a and the middle resin blocks 4c are not provided, whereby the concrete layer 4b (first concrete part) and the concrete layer 4d (second concrete The portion) can be formed to extend into a planar shape. An intermediate resin block 4c is provided between the concrete layer 4b and the concrete layer 4d. The concrete layer 4b and the concrete layer 4d are preferably completely divided by the intermediate resin block 4c. The concrete layer 4b and the concrete layer 4d may be partially connected.

[Function and effect] FIG. 4 is a cross-sectional view for explaining the function and effect of the light-weight filling structure 10 in the embodiment. FIG. 5 is a cross-sectional view for explaining the function and effect of the lightweight earth filling structure 10a in the comparative example. The difference between the lightweight earth filling structure 10a of the comparative example and the lightweight earth filling structure 10 is that the middle floor part 2 and the upper floor part 4 are comprised only by a concrete layer.

In a situation where a large-scale earthquake occurs around the lightweight fill structure 10 and the lightweight fill structure 10a, the middle floor portion 2 and the upper floor portion 4 may press the side wall portion 8c of the abutment 8 in some cases. Due to the influence of the earthquake, the soil 9 further existing on the back side of the laminated foam blocks 1a, 3a may act as soil pressure on the side walls of the abutment 8 via the middle floor portion 2 and the upper floor portion 4部8c.

In FIGS. 4 and 5, the fold line P1 (embodiment) and the fold line P2 (comparative example) schematically show the magnitude of the pressure acting on the side wall portion 8c. In the light-weight filling structure 10, the end resin blocks 2a and the end resin blocks 4a can function as buffer materials. Compared with the case of the comparative example (Figure 5), the middle floor part 2 and the upper floor part 4 are concentrated In addition, the situation of directly pressing the side wall portion 8c is relatively alleviated. In addition, the transmission of stress is also alleviated by the presence of the intermediate resin block 2c and the intermediate resin block 4c, and as a result, the situation in which the intermediate floor portion 2 and the upper floor portion 4 press the side wall portion 8c is alleviated.

Unlike foam blocks, polypropylene (PP) is used as the material of these resin blocks. In the case of the following resin block, the compressive force in the horizontal direction is likely to be weaker than the compressive force in the vertical direction, and plastic deformation is likely to occur in the horizontal direction: for the purpose of dispersing the upper load (vehicle load or pavement load) It is necessary to use a resin block for a part of the installation site of the concrete floor, for example, a resin block made of polystyrene, which is manufactured by an extrusion foaming method with high strength. In contrast, the cushioning material made of polypropylene is compressed even if it receives a sudden impact force between the side wall of a bridge abutment or the like and the concrete floor, or between the first concrete part and the second concrete part. Part of the possibility of plastic deformation is lower than that of cushioning materials made of polystyrene, and it is easy to return to the state before compression. In addition, compared with polystyrene, polypropylene is rarely dissolved due to contact with petroleum.

Therefore, according to the lightweight earth fill structure 10 in this embodiment, it is less likely to be plastically deformed and has more oil resistance, so that it can function as a lightweight earth fill over a longer period of time. The oil-proof sheet can be further applied to the light-weight fill structure 10 in an overlapping manner according to needs, and a part of the light-weight fill structure 10 can also be covered with a material that prevents the penetration of petroleum. With these countermeasures, better effects can be obtained. Even when these countermeasures are not implemented, as described above, by being less prone to plastic deformation and having more oil resistance, it can function as a lightweight fill over a longer period of time.

As shown in Fig. 2, in the lightweight filling structure 10, the lower surface of the end resin block 2a and the lower surface of the middle resin block 2c are further fixed by the upper and lower double claw type fastening metal fittings 6. The foam block 1a of the uppermost layer of the lower filling part 1. By adopting these structures, the integrity of the lower filling part 1 and the middle floor part 2 is improved, and the middle floor part 2 is more restrained from locally pressing the side wall part 8c of the abutment 8. The overall integration is improved and the shock resistance is also improved. These conditions are the same in the end resin block 4a and the intermediate resin block 4c.

The upper surface of the end resin block 2a and the upper surface of the intermediate resin block 2c are fixed to the foam block 3a of the lowermost layer of the upper fill part 3 by the upper and lower double claw type fastening metal fittings 6. By adopting these structures, the integration of the middle floor part 2 and the upper filling part 3 is improved, and the situation that the middle floor part 2 partially presses the side wall part 8c of the abutment 8 is suppressed. The integration of the improved seismic resistance is also improved. These conditions are the same in the end resin block 4a and the intermediate resin block 4c.

The lightweight earth-filling structure 10 described in the above description is constructed so that only one side becomes a vertical wall by being installed steeply. The technical idea disclosed in the above description can also be applied to a lightweight earth-fill structure constructed so that both sides are vertical walls. The technical idea disclosed in the above description can also be applied to a light-weight filling structure in which a plurality of floor parts (middle concrete floor) are laminated with an integrated filling part interposed therebetween.

Although the embodiments of the present invention have been described, it should be understood that all the embodiments disclosed in this specification are only examples and not limitations. The scope of the present invention is shown by the scope of the patent application, and includes all changes in the equivalent sense and within the scope of the patent application.

1: Filling part on the lower side 1a, 3a: foam block 2: Middle floor 2a, 4a: End resin block 2b, 2d, 4b, 4d: concrete layer 2c, 4c: Intermediate resin block 3: Upper filling part 4: Upper floor 5a: road disk 5b: paving 6: Fastening metal parts 6P: Flat part 6S: Lower claw 6U: Upper claw 7: Site 8: Abutment 8a: Pedestal 8b: Pillar 8c: side wall 9: soil 10, 10a: Lightweight fill structure 20: Bridge P1, P2: Polyline

[Fig. 1] is a cross-sectional view showing the lightweight filling structure 10 in the embodiment. [Fig. 2] An enlarged cross-sectional view showing the area enclosed by line II in Fig. 1. [Fig. 3] is a perspective view showing the fastening metal fitting 6 which can be applied to the lightweight earth filling structure 10. [Fig. [Fig. 4] is a cross-sectional view for explaining the function and effect of the lightweight filling structure 10 in the embodiment. [Fig. 5] is a cross-sectional view for explaining the function and effect of the light-weight filling structure 10a in the comparative example.

1: Filling part on the lower side 1a, 3a: foam block 2: Middle floor 2a, 4a: End resin block 2b, 2d, 4b, 4d: concrete layer 2c, 4c: Intermediate resin block 3: Upper filling part 4: Upper floor 5a: road disk 5b: paving 6: Fastening metal parts 7: Site 8: Abutment 8a: Pedestal 8b: Pillar 8c: side wall 9: soil 10: Lightweight fill structure 20: Bridge

Claims (3)

A light-weight filling structure with: The fill part is composed of multiple layers of foam blocks; The floor part is arranged between the above-mentioned foam blocks adjacent to each other up and down, or is arranged on the upper surface of the above-mentioned filling part; and The side wall part covers the outer surface of the aforementioned filling part and the outer surface of the aforementioned floor part; The aforementioned floor system has: The concrete layer is cast in a way that extends into a plane; and The resin block is composed of polypropylene and is arranged adjacent to the aforementioned concrete layer in the surface direction; The aforementioned lightweight filling structure is further equipped with upper and lower double claw type fastening metal parts; The fastening metal fitting is provided between the lower surface of the resin block and the foam block on the lower side, and/or between the upper surface of the resin block and the foam block on the upper side. The lightweight earth-filling structure described in claim 1, wherein the resin block is provided between the side wall portion and the concrete layer. The lightweight earth-fill structure described in claim 1 or 2, wherein the aforementioned concrete layer includes: The first concrete part; and The second concrete part is arranged on the opposite side of the aforementioned side wall part with respect to the aforementioned first concrete part; The resin block is arranged between the first concrete part and the second concrete part.

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