Lightweight embankment structure and method for constructing lightweight embankments

Abstract

This invention provides a method for constructing a lightweight embankment and a lightweight embankment structure that allows for easy inspection of ground anchors even after the embankment has been constructed, using foamed polyurethane. [Solution] The lightweight embankment structure 100,200 using foamed urethane comprises a wall body 2 erected on the ground M, a foamed urethane section 3 formed by filling the spaces S,S1 partitioned by the ground M and the wall body 2 with foamed urethane, a ground anchor 4 that penetrates the foamed urethane section 3 and has one end driven into the ground M, and a pressure receiving plate 5 connected to the other end of the ground anchor 4, and the movement of the foamed urethane section 3 is restricted by the ground anchor 4 and the pressure receiving plate 5.

Description

Technical Field

[0001] The present invention relates to a lightweight embankment structure and a method for constructing a lightweight embankment.

Background Art

[0002] Patent Document Ⅰ discloses an embankment structure in which a foamed body is filled in a raised space partitioned by a wall material, and a surface layer is provided on the foamed body. The invention described in Patent Document Ⅰ includes an anchor member (ground anchor) driven into the ground, and a tie rod having one end connected to the anchor member via a connecting member and the other end connected to a column material side member across the raised space below the surface layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document Ⅰ

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is preferable to regularly inspect the anchor member even after the embankment construction. However, in the invention described in Patent Document Ⅰ, since the anchor member is embedded in the foamed body, it is impossible to easily inspect the anchor member.

[0005] [[ID=3I]]An object of the present invention is to provide a method for constructing a lightweight embankment and a lightweight embankment structure that can easily inspect the ground anchor even after the embankment construction in an embankment using urethane foam.

Means for Solving the Problems

[0006] The present invention relates to a lightweight embankment structure using foamed urethane, comprising: a wall body erected on the ground; a foamed urethane section formed by filling the space partitioned by the ground and the wall body with foamed urethane; a ground anchor that penetrates the foamed urethane section and has one end driven into the ground; and a pressure-receiving plate connected to the other end of the ground anchor, wherein the movement of the foamed urethane section is restricted by the ground anchor and the pressure-receiving plate. [Effects of the Invention]

[0007] In this invention, a pressure-receiving plate is connected to the end of the ground anchor that penetrates the foamed urethane section, allowing the end of the ground anchor to be exposed to the outside of the foamed urethane section. This makes it easy to inspect the ground anchor even after the embankment has been constructed. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of the lightweight embankment structure according to this embodiment. [Figure 2] Figure 2 is a diagram illustrating the wall installation process in the lightweight embankment construction method according to this embodiment. [Figure 3] Figure 3 is a front view of the wall body and the vicinity of the plywood covering the opening of the wall body according to this embodiment. [Figure 4] Figure 4 is a diagram illustrating the pipe installation process in the lightweight embankment construction method according to this embodiment. [Figure 5] Figure 5 is a diagram illustrating the foamed urethane filling process in the lightweight embankment construction method according to this embodiment. [Figure 6] Figure 6 is a front view of the wall body and the vicinity of the pressure receiving plate that closes the opening of the wall body according to this embodiment. [Figure 7] Figure 7 is an enlarged cross-sectional view of the vicinity of the pressure-receiving plate according to this embodiment. [Figure 8] Figure 8 is a diagram illustrating the anchor installation process in the lightweight embankment construction method according to this embodiment. [Figure 9]Figure 9 is a cross-sectional view of a modified lightweight embankment structure during construction. [Figure 10] Figure 10 is a cross-sectional view of a modified lightweight embankment structure. [Modes for carrying out the invention]

[0009] The following describes a lightweight embankment structure 100 according to an embodiment of the present invention.

[0010] As shown in Figure 1, the lightweight embankment structure 100 is constructed by filling the space between the existing road 1 (structure) and the ground M with foamed urethane. The lightweight embankment structure 100 will be described in detail below.

[0011] As shown in Figure 1, the structure comprises a wall body 2 erected on the ground M, a foamed urethane section 3 formed by foamed urethane filled between the existing road 1 and the ground M, a ground anchor 4 that penetrates the foamed urethane section 3 and has one end 4a driven into the ground M, a pressure receiving plate 5 connected to the other end 4b of the ground anchor 4, and a sheath pipe 6 that covers the outer circumference of the ground anchor 4 within the foamed urethane section 3.

[0012] The road 1 in this embodiment is provided along a sloping ground M. The road 1 has concrete bridge piers 1a (support columns) and bridge girders 1b that are stretched across adjacent bridge piers 1a.

[0013] The wall structure 2 is constructed, for example, by stacking aluminum composite panels 2a. Specifically, it is constructed by fitting the ends of the composite panels 2a into metal H-shaped support columns (not shown) erected at predetermined intervals on a concrete foundation 7 provided on the ground M, and stacking them. The wall structure 2 extends vertically from the ground M to a height near the bridge girder 1b. The wall structure 2 is provided with openings 2b (see Figure 3, etc.) through which ground anchors 4 are inserted.

[0014] The foamed urethane part 3 is formed by the curing of the foamed urethane filled in the space S partitioned by the road 1, the ground M, and the wall surface body 2. In this embodiment, rigid polyurethane foam is used as the foamed urethane. The foamed urethane part 3 is filled so as to closely adhere to the entire lower surface of the bridge girder 1b of the road 1, the entire surface (ground surface) of the ground M, and the entire circumference of the pier 1a of the road 1 within the space S.

[0015] The ground anchor 4 is inserted through the inside of the sheath pipe 6 embedded in the foamed urethane part 3, and one end 4a (tip) thereof is driven into the ground M. The other end 4b of the ground anchor 4 is exposed from the foamed urethane part 3 and is connected to the pressure receiving plate 5. In the example shown in FIG. 1, two ground anchors 4 are provided in the vertical direction, but three or more may be provided as necessary. Although not shown, the ground anchors 4 are provided at predetermined intervals in the horizontal direction (the longitudinal direction of the bridge girder 1b).

[0016] For example, a steel independent pressure receiving plate (independent steel pressure receiving plate) is used as the pressure receiving plate 5. The pressure receiving plate 5 is attached so as to close the opening 2b provided in the wall surface body 2 (see also FIGS. 6 and 7, etc.). A through hole 5a is provided near the center of the pressure receiving plate 5 at a position facing the opening 6a on one end side of the sheath pipe 6 (see FIG. 7, etc.). The pressure receiving plate 5 is not limited to a steel independent pressure receiving plate, and may be, for example, an independent pressure receiving plate made of resin, concrete, or wood.

[0017] The sheath pipe 6 is constituted by, for example, a metal pipe. The sheath pipe 6 is installed such that the opening 6a on one end side faces the opening 2b of the wall surface body 2, and the opening 6b on the other end side faces the ground M.

[0018] Next, a specific construction method of the lightweight embankment structure 100 will be described while referring to FIGS. 2 to 8.

[0019] As shown in Figure 2, first, a concrete foundation 7 is poured onto the ground M, and support columns (not shown) are erected vertically on the foundation 7. Composite panels 2a are then stacked vertically between the support columns to construct a wall body 2 (see also Figure 3). This creates a space S formed by the ground M, the road 1, and the wall body 2. In the example shown in Figure 2, the wall body 2 is installed on a flat area of ​​the ground M, but depending on the shape of the ground M, the wall body 2 may be installed on an inclined area (see Figure 10, etc.). This process corresponds to the "wall body installation process" in the claims.

[0020] Furthermore, as shown in Figures 2 and 3, the opening 2b provided in the wall body 2 is covered with a wooden plywood 8. It is preferable to apply a release agent to the surface of the plywood 8 facing the space S beforehand.

[0021] Next, as shown in Figure 4, the conduit pipe 6 is installed in the space S. Specifically, the conduit pipe 6 is installed in the space S such that the opening 6a at one end faces the opening 2b in the wall body 2, and the opening 6b at the other end faces the ground M. The conduit pipe 6 is fixed in the space S by a support frame (not shown). The support frame that fixes the conduit pipe 6 is embedded in the foamed urethane when the foamed urethane is filled, as described later. This process of installing the conduit pipe 6 corresponds to the "conduit pipe installation process" in the claims.

[0022] Next, as shown in Figure 5, foamed urethane is filled into the space S. At this time, the foamed urethane is filled into the space S without any gaps. More specifically, it is filled into the space S without any gaps so that it is in close contact with the entire surface (ground surface) of the ground M in the space S, the entire underside of the bridge girder 1b of the road 1, and the entire circumference of the bridge pier 1a of the road 1. The foamed urethane section 3 is constructed when the filled foamed urethane hardens. Note that the step of filling the space S with foamed urethane corresponds to the "foamed urethane filling step" in the claims. Before filling the space S with foamed urethane, a waterproofing agent or the like may be applied to the ground M.

[0023] Next, the ground anchors 4 are installed. Specifically, first, the plywood 8 is removed from the wall body 2. Then, the pressure plate 5 is attached to the foamed urethane section 3 so that the through hole 5a provided near the center of the pressure plate 5 faces the opening 6a on one end of the conduit pipe 6, and closes the opening 2b in the wall body 2. In this embodiment, the pressure plate 5 is fixed to the foamed urethane section 3 by driving anchor pins 5b into the foamed urethane section 3 (see Figure 7, etc.).

[0024] Then, as shown in Figure 8, the ground anchor 4 is inserted through the through hole 5a of the pressure plate 5 and the sheath pipe 6, and the ground anchor 4 is driven into the ground M using a driving device. The method for driving the ground anchor 4 into the ground M is well known, so an explanation is omitted here. Note that this process of driving the ground anchor 4 corresponds to the "anchor driving process" in the claims.

[0025] After the ground anchor 4 has been driven into the ground M, a bearing plate and nuts are attached to the other end 4b (end) of the ground anchor 4, and the nuts are tightened to connect the ground anchor 4 and the pressure plate 5, and tension is applied to the ground anchor 4. This step of connecting the ground anchor 4 and the pressure plate 5 corresponds to the "pressure plate attachment step" in the claims.

[0026] Subsequently, caps (not shown) covering the other end 4b of the ground anchor 4 and the through hole 5a are attached. In addition, the gap between the opening 2b of the wall body 2 and the pressure plate 5 is filled with sealant or the like. This prevents deterioration of the foamed urethane part 3 due to ultraviolet rays.

[0027] In the lightweight embankment structure 100 of this embodiment, the wall body 2 is left in place even after the ground anchors 4 are driven in. Since foamed urethane deteriorates due to ultraviolet rays, leaving the wall body 2 in place prevents direct exposure of the foamed urethane section 3 to ultraviolet rays. This prevents deterioration of the foamed urethane section 3 due to ultraviolet rays.

[0028] The lightweight embankment structure 100 and the construction method for the lightweight embankment structure 100 described above will produce the following effects.

[0029] In the lightweight embankment structure 100, a pressure plate 5 is connected to the other end 4b (end) of the ground anchor 4 that penetrates the foamed urethane section 3. This allows the other end 4b of the ground anchor 4 to be exposed to the outside of the foamed urethane section 3. As a result, the ground anchor 4 can be easily inspected even after the lightweight embankment structure 100 has been constructed.

[0030] Furthermore, in the lightweight embankment structure 100, the movement of the foamed urethane section 3 can be restricted by a ground anchor 4, one end 4a of which is driven into the ground M, and a pressure-receiving plate 5 connected to the other end 4b of the ground anchor 4. This prevents the foamed urethane section 3 from shifting relative to the ground M.

[0031] Furthermore, in the lightweight embankment structure 100, a conduit pipe 6 through which the ground anchor 4 is inserted is provided before filling the space S with foamed urethane. Since it is difficult to drill holes in foamed urethane, by providing the conduit pipe 6 in advance, it is not necessary to drill through holes in the foamed urethane section 3 for inserting the ground anchor 4. As a result, the ground anchor 4 can be driven directly into the ground M, improving work efficiency.

[0032] Furthermore, in the lightweight embankment structure 100, foamed urethane is filled without any gaps in the space S, that is, from the ground to the bottom surface of the road 1. As a result, the foamed urethane section 3 can support the road 1 from below, thereby improving the strength of the road 1.

[0033] Furthermore, in the lightweight embankment structure 100, foamed urethane is filled in such a way that it adheres tightly to (covers) the entire underside of the road 1 and the entire circumference of the bridge pier 1a of the road 1. This suppresses deterioration from the underside of the road 1 and the deterioration of the bridge pier 1a. In addition, it can improve the strength of the road 1 and the bridge pier 1a.

[0034] In the lightweight embankment structure 100, an opening 2b is provided in the wall body 2 for installing ground anchors 4. This eliminates the need to remove the wall body 2 in order to install the ground anchors 4, thereby improving work efficiency.

[0035] Furthermore, in the lightweight embankment structure 100, the wall body 2 is left in place after the ground anchors 4 are driven in. This prevents the foamed urethane section 3 from being exposed to the outside, thus preventing deterioration of the foamed urethane section 3 due to ultraviolet rays and other factors. In addition, the opening 2b provided in the wall body 2 is closed with a pressure plate 5. This improves work efficiency as described above, while more reliably preventing deterioration of the foamed urethane section 3 due to ultraviolet rays and other factors.

[0036] In the above embodiment, the lightweight embankment structure 100 is constructed by filling the lower part of the existing road 1 with foamed urethane, but this is not the only method. For example, a lightweight embankment structure using foamed urethane can also be used for newly constructed roads. A modified example of this lightweight embankment structure 200 will be described with reference to Figures 9 and 10. For configurations and construction methods similar to those of the lightweight embankment structure 100, reference numerals are used in Figures 9 and 10, and explanations will be omitted as appropriate.

[0037] In the lightweight embankment structure 200, the foamed urethane section 3 is constructed first, and then the road 1 is constructed on top of the foamed urethane section 3. Specifically, first, a wall body 2 is erected on the ground M, then a conduit pipe 6 is installed in the space S1 formed by the ground M and the wall body 2, and then foamed urethane is filled into the space S1 to construct the foamed urethane section 3. Similar to the construction method of the lightweight embankment structure 100, the work is carried out in the order of wall body installation, conduit pipe installation, and foamed urethane filling. In the lightweight embankment structure 200, the space S1 is formed by the ground M and the wall body 2 (see Figure 9).

[0038] Next, in the same manner as the anchor installation process for the lightweight embankment structure 100, the ground anchors 4 are inserted through the through-holes 5a of the pressure plate 5 and the sheath pipes 6, and driven into the ground M (see Figure 9).

[0039] Subsequently, the pressure plate 5 is connected to the other end 4b of the ground anchor 4 in the same manner as the pressure plate installation process for the lightweight embankment structure 100.

[0040] Then, the road 1 is constructed on the upper surface of the foamed urethane section 3 (see Figure 10). In the lightweight embankment structure 200 constructed in this way, the foamed urethane section 3 corresponds to the embankment. For example, in sloping areas where heavy machinery cannot be used, it may be difficult to construct an embankment using soil. Therefore, by using foamed urethane as the embankment, as in the lightweight embankment structure 200, there is no need to transport soil or level the ground. This makes it possible to easily construct an embankment even in places where it is difficult to use heavy machinery. The step of constructing the road 1 on the upper surface of the foamed urethane section 3 corresponds to the "structure construction step" in the claims.

[0041] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0042] In the above embodiment, the plywood 8 is removed from the wall body 2 when the ground anchor 4 is installed. However, if it is possible to leave the plywood 8 in place, it may be left in place. In this case, for example, the pressure receiving plate 5 can be attached so as to cover the plywood 8.

[0043] Furthermore, although the above embodiment uses road 1 as an example of a structure, it is not limited to this. For example, the lightweight embankment structures 100 and 200 can also be applied to elevated railway structures. [Explanation of Symbols]

[0044] 100, 200 Lightweight Embankment Structure 1 Road (Structure) 1a Bridge pier (support column) 1b Bridge girder 2 Wall surfaces 2a composite board 2b opening 3. Foamed urethane section 4 Ground anchor 4a one end 4b Other end 5 Pressure plate 5a through hole 5b Anchor pin 6. Sheath tube 6a aperture 6b opening 7 Basics 8 plywood M ground S, S1 space

Claims

1. A lightweight embankment structure using foamed urethane, A wall structure erected on the ground, A foamed urethane section formed by filling the space partitioned by the ground and the wall body with the foamed urethane, A ground anchor is provided, which penetrates the foamed urethane section and has one end driven into the ground. The other end of the ground anchor is connected to a pressure-receiving plate, A lightweight embankment structure in which the movement of the foamed urethane section is restricted by the ground anchor and the pressure plate.

2. A lightweight embankment structure according to claim 1, The aforementioned wall body is provided with an opening through which the ground anchor is inserted. The pressure receiving plate is a lightweight embankment structure that is attached to close the opening provided in the wall surface.

3. A lightweight embankment structure according to claim 1, The aforementioned wall body is provided with an opening through which the ground anchor is inserted. The aforementioned opening is covered with plywood. The pressure-receiving plate is attached to the outside of the plywood in a lightweight embankment structure that covers the plywood.

4. A lightweight embankment structure according to claim 1, A lightweight embankment structure further comprising a sheath pipe covering the outer circumference of the ground anchor within the foamed urethane section.

5. A lightweight embankment structure according to claim 1, The upper surface of the space into which the foamed urethane is filled is covered by an existing structure. The foamed urethane portion is a lightweight embankment structure that is filled so as to be in close contact with the entire lower surface of the existing structure.

6. A method for constructing a lightweight embankment using foamed polyurethane, The wall installation process involves erecting a wall structure in relation to the ground, A foamed urethane filling step in which the foamed urethane is filled into the space partitioned by the ground and the wall body, An anchor installation process involves driving one end of a ground anchor into the ground through an opening provided in the wall, penetrating the filled foamed urethane, and A method for constructing a lightweight embankment, comprising a pressure plate installation step in which the other end of the ground anchor is connected to a pressure plate, thereby restricting the movement of the hardened foamed urethane in the space by the ground anchor and the pressure plate.

7. A method for constructing a lightweight embankment as described in claim 6, A method for constructing a lightweight embankment, further comprising a conduit installation step of installing a conduit through which the ground anchor is inserted into the space, prior to the foamed urethane filling step.

8. A method for constructing a lightweight embankment as described in claim 6, In the foamed urethane filling process, the opening is sealed with plywood and the foamed urethane is filled in. In the anchor installation process, the plywood is removed, and one end of the ground anchor is driven into the ground through the opening. A method for constructing a lightweight embankment, wherein the pressure plate installation step involves closing the opening with the pressure plate.

9. A method for constructing a lightweight embankment as described in claim 6, A method for constructing a lightweight embankment, wherein the wall body remains in place even after all the aforementioned steps have been completed.

10. A method for constructing a lightweight embankment as described in claim 6, The upper surface of the space into which the foamed urethane is filled is covered by an existing structure. A method for constructing a lightweight embankment, wherein the foamed urethane filling step involves filling the foamed urethane so that it adheres tightly to the entire lower surface of the existing structure.

11. A method for constructing a lightweight embankment as described in claim 6, A method for constructing a lightweight embankment, further comprising a structure construction step in which a structure is constructed on top of the hardened polyurethane foam after the polyurethane foam filled in the aforementioned polyurethane foam filling step has hardened.

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