Reinforcement structure and reinforcement method for retaining walls

Abstract

This invention provides a retaining wall reinforcement structure and construction method that can reinforce even collapsed stone retaining walls as easily as possible. [Solution] The retaining wall reinforcement structure 1 is characterized by having a columnar first reinforcing body 15 formed vertically inside the retaining wall 10, a columnar second reinforcing body 16 formed vertically inside the retaining wall 10 but outside the columnar first reinforcing body 15, a wall-like reinforcing body 25 formed outside the columnar second reinforcing body 16, and a rod-shaped reinforcing member 26 inserted from the wall-like reinforcing body 25 toward the columnar first reinforcing body 15 and connected to the columnar first reinforcing body 15. Even collapsed stone retaining walls can be reinforced as easily as possible.

Description

Technical Field

[0001] The present invention relates to a reinforcement structure for retaining walls such as stone-built retaining walls that are at risk of collapse due to the influence of earthquakes or rainfall, and a construction method therefor.

Background Art

[0002] Retaining walls such as embankment stone retaining walls and stone block retaining walls may collapse due to external forces such as earthquakes, or an increase in water level due to guerrilla heavy rain, long rain, or rainfall, which reduces the supporting force of the embankment and generates earth pressure on the back, causing the balance of stones and the like to collapse. Generally, the reinforcement of retaining walls is carried out by burying long reinforcing materials in the ground or filling grout into drilled holes in places where the bearing capacity of natural ground such as embankments or cut slopes in residential areas is low in order to ensure frictional resistance. Conventionally, the restoration of collapsed stone retaining walls and the like has been carried out by removing the stones and earth and sand of the stonework over a wide area and then re-stacking the stones.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, when constructing a retaining wall within a limited (site) area, it is difficult to bring in large machinery. Also, depending on the site, when restoring a retaining wall, there may be a possibility that buildings near the collapse need to be demolished and the construction work needs to be carried out after considering safety and other factors, which may increase the construction process and lengthen the construction period.

[0004] An object of the present invention is to provide a reinforcement structure for retaining walls that can be reinforced as easily as possible even for collapsed stone retaining walls and the like, and a construction method therefor.

Means for Solving the Problems

[0005] According to the present invention, which solves the above problems, a retaining wall reinforcing structure is provided, characterized by comprising: a columnar first reinforcing body formed vertically inside the retaining wall; a columnar second reinforcing body formed vertically inside the retaining wall but outside the columnar first reinforcing body; a wall-like reinforcing body formed outside the columnar second reinforcing body; and a rod-shaped reinforcing member inserted from the wall-like reinforcing body toward the columnar first reinforcing body and connected to the columnar first reinforcing body.

[0006] In this reinforcing structure, a retaining wall may be formed on the outside of the wall-like reinforcing body.

[0007] Furthermore, the present invention provides a method for reinforcing a retaining wall, characterized by comprising the steps of: forming a columnar first reinforcing body vertically at a location inside the retaining wall; forming a columnar second reinforcing body vertically at a location inside the retaining wall but outside the columnar first reinforcing body; forming a wall-like reinforcing body outside the columnar second reinforcing body; and inserting a rod-shaped reinforcing material from the wall-like reinforcing body toward the columnar first reinforcing body and connecting it to the columnar first reinforcing body.

[0008] In this reinforcement method, the site of the collapsed retaining wall may be restored. Alternatively, a retaining wall may be formed on the outside of the wall-like reinforcement body. [Effects of the Invention]

[0009] According to the present invention, a reinforced retaining wall can be formed as easily as possible, even at sites where a collapsed stone retaining wall has been constructed. [Brief explanation of the drawing]

[0010] [Figure 1] This is an explanatory diagram of a retaining wall reinforcement structure according to an embodiment of the present invention. [Figure 2] This is a diagram illustrating the stone retaining wall before it collapsed. [Figure 3] This is an explanatory diagram of a collapsed stone retaining wall. [Figure 4] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing a state in which a columnar first reinforcing body is formed vertically at a location that is inside the retaining wall. [Figure 5] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing the state of preparing a collapsed slope. [Figure 6] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing a state in which a second columnar reinforcing body is formed vertically outside the first columnar reinforcing body at a location within the retaining wall. [Figure 7] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing a state in which a wall-like reinforcement is formed on the outside of a columnar second reinforcement. [Figure 8] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing a state in which a rod-shaped reinforcing material is inserted from a wall-shaped reinforcing body toward a columnar first reinforcing body and connected to the columnar first reinforcing body. [Figure 9] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing an example of the arrangement of a columnar first reinforcement body, a columnar second reinforcement body, a wall-like reinforcement body, and a rod-shaped reinforcement member as seen from above. [Figure 10] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing a state in which a retaining wall is formed on the outside of a wall-like reinforcement body. [Figure 11] This is an explanatory diagram of a retaining wall reinforcement method according to an embodiment of the present invention, showing the reinforced retaining wall in its completed state. [Figure 12] This is an explanatory diagram of a retaining wall reinforcement method according to another embodiment of the present invention, showing a state in which a rod-shaped reinforcing material is inserted from a wall-shaped reinforcing body toward a columnar first reinforcing body, and the rod-shaped reinforcing material and the columnar first reinforcing body are connected by crossing them. [Figure 13] This is an explanatory diagram of a rod-shaped reinforcing material used in a retaining wall reinforcement method according to another embodiment of the present invention, in which a hook is attached to the front side of the tip. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted.

[0012] (Reinforcement structure of retaining wall) As shown in FIG. 1, the retaining wall reinforcement structure 1 according to the embodiment of the present invention has a function of reinforcing the retaining wall 10. That is, the building 11 is arranged on the high ground 12 of the stepped terrain, and a retaining wall 10 is installed between it and the low ground 13 in order to prevent the ground 12 from collapsing.

[0013] The retaining wall reinforcement structure 1 according to the embodiment of the present invention has a columnar first reinforcement body 15 formed vertically inside the retaining wall 10 (the part between the retaining wall 10 and the building 11, which is the left part of the retaining wall 10 in FIG. 1), and similarly, a columnar second reinforcement body 16 formed vertically at an interval outside the columnar first reinforcement body 15 inside the retaining wall 10 (the right part of the columnar first reinforcement body 15 in FIG. 1).

[0014] The columnar first reinforcement body 15 has a column shape such as a cylinder or a square tube, and has an RC structure combined with reinforcing bars 20 and a rigid member 21 such as concrete or mortar. Similarly, the columnar second reinforcement body 16 also has a column shape such as a cylinder or a square tube, and has an RC structure combined with reinforcing bars 22 and a rigid member 23 such as concrete or mortar.

[0015] A plurality of columnar first reinforcement bodies 15 and columnar second reinforcement bodies 16 are installed at appropriate intervals along the longitudinal direction of the retaining wall 10 (the direction perpendicular to the paper surface in FIG. 1).

[0016] The lower ends of the columnar first reinforcement body 15 and the columnar second reinforcement body 16 are both buried to a position deeper than the low ground 13 at the lower part of the retaining wall 10. The upper ends of the columnar first reinforcement body 15 and the columnar second reinforcement body 16 are both set to the same height as the high ground 12 at the upper part of the retaining wall 10.

[0017] On the outside of the columnar second reinforcing member 16, a wall-shaped reinforcing member 25 is formed. The wall-shaped reinforcing member 25 is composed of horizontal wooden boards, steel plates, steel sheet piles, etc., and is installed so as to horizontally cover the outside of a plurality of columnar second reinforcing members 16 installed along the longitudinal direction of the retaining wall 10. By this wall-shaped reinforcing member 25, the outside of the space between the columnar first reinforcing member 15 and the columnar second reinforcing member 16 is in a state of being blocked from the outside.

[0018] The wall-shaped reinforcing member 25 and the columnar first reinforcing member 15 are connected by a rod-shaped reinforcing material 26. That is, holes for passing the rod-shaped reinforcing material 26 are formed in the wall-shaped reinforcing member 25, and the rod-shaped reinforcing material 26 is inserted from the outside of the wall-shaped reinforcing member 25 through the holes toward the columnar first reinforcing member 15, and the tip of the rod-shaped reinforcing material 26 is connected to the columnar first reinforcing member 15. Further, the rear end of the wall-shaped reinforcing member 25 passed through the hole is attached to the wall-shaped reinforcing member 25 by attaching a reaction plate 27 (washer) arranged on the outer surface of the wall-shaped reinforcing member 25.

[0019] Also, inside the retaining wall 10 (the space between the columnar first reinforcing member 15 and the columnar second reinforcing member 16 blocked from the outside by the wall-shaped reinforcing member 25), a filling and reinforcing portion 28 filled with earth and sand, lightweight mortar, concrete, etc. is formed. The above is a schematic configuration of the reinforcing structure 1 of the retaining wall according to the embodiment of the present invention.

[0020] (Reinforcing method for retaining wall) Next, the reinforcing method for the retaining wall according to the embodiment of the present invention will be described according to FIGS. 2 to 11. As an example, the case of restoring the site of the collapsed stone-built retaining wall 30 will be described.

[0021] As shown in FIG. 2, in the state before collapse, the area between the high ground 12 and the low ground 13 where the building 11 is installed is protected by the stone-built retaining wall 30. However, when the supporting force of the embankment decreases due to external forces such as earthquakes, or the water level rises due to guerrilla heavy rain, long rain, or rainfall, resulting in soil pressure on the back surface, as shown in FIG. 3, the balance of stones and the like may collapse and the stone-built retaining wall 30 may collapse.

[0022] First, at the site of the collapse, a columnar first reinforcing body 15 is formed vertically in the position that will become the interior of the retaining wall to be newly installed. Specifically, as shown in Figure 4, a hole is drilled vertically near the building 11 at the location where the columnar first reinforcing body 15 will be formed. Reinforcing bars 20 are inserted into the hole, and a rigid member 21 is then filled into the hole to form the columnar first reinforcing body 15. The reinforcing bars 20 can be rock bolts, circular steel pipes, deformed steel bars, reinforcing cages, etc. The rigid member 21 can be concrete, mortar, etc. When filling with concrete, mortar, etc. to be used as the rigid member 21, a formwork such as a reinforcing cage, circular steel pipe, or PVC is installed inside the hole, and the construction is completed by removing the formwork after solidification. The lower end of the columnar first reinforcing body 15 is drilled so that it is buried to a position deeper than the lower ground 13. The upper end of the columnar first reinforcing body 15 is set to a height about the same as the higher ground 12. The shape of the columnar first reinforcing body 15 is not limited to a cylinder, but may also be a square column. Multiple columnar first reinforcing members 15 are installed at appropriate intervals along the longitudinal direction of the retaining wall.

[0023] Furthermore, when forming the columnar first reinforcing body 15, mortar may be sprayed onto the slope to prevent further collapse of the collapsed slope. Also, as shown in Figure 5, the shape of the collapsed slope may be shaped and pre-treated by covering it with a drainage mat 31.

[0024] Next, a columnar second reinforcing member 16 is formed vertically in a position that is inside the retaining wall and outside the columnar first reinforcing member 15. Specifically, as shown in Figure 6, a vertical hole is drilled at a position outside the previously formed columnar first reinforcing body 15, within the interior of the retaining wall. Reinforcing bars 22 are inserted into the hole, and a rigid member 23 is then filled into the hole to form the columnar second reinforcing body 16. Similar to the columnar first reinforcing body 15, rock bolts, circular steel pipes, deformed steel bars, reinforcing cages, etc., can be used for the reinforcing bars 22. Concrete, mortar, etc., can be used for the rigid member 23. When filling with concrete, mortar, etc., to be used as the rigid member 23, a formwork such as a reinforcing cage, circular steel pipe, or PVC is installed inside the hole, and the construction is completed by removing the formwork after solidification. Similar to the columnar first reinforcing body 15, the lower end of the columnar second reinforcing body 16 is drilled to a position deeper than the lower ground 13. The upper end of the columnar second reinforcing body 16 is set to a height similar to that of the higher ground 12. The shape of the columnar second reinforcing body 16 is not limited to a cylinder, but may also be a square column. Similar to the columnar first reinforcing body 15, multiple columnar second reinforcing bodies 16 are installed at appropriate intervals along the longitudinal direction of the retaining wall.

[0025] Next, as shown in Figure 7, a wall-like reinforcing body 25 is formed on the outside of the columnar second reinforcing body 16. In other words, wall-like reinforcing bodies 25 are installed so as to cover the outside of the columnar second reinforcing bodies 16, which are installed in multiple locations along the longitudinal direction of the retaining wall, in a horizontal direction. The wall-like reinforcing bodies 25 can be made of horizontal sheet piles, steel plates, steel sheet piles, etc. By installing wall-like reinforcing bodies 25 on the outside of the columnar second reinforcing bodies 16 in this way, the outside of the space between the columnar first reinforcing bodies 15 and the columnar second reinforcing bodies 16 is sealed off from the outside.

[0026] Next, as shown in Figure 8, a rod-shaped reinforcing member 26 is inserted from the outside of the wall-shaped reinforcing member 25 through a hole toward the columnar first reinforcing member 15, and the tip of the rod-shaped reinforcing member 26 is connected to the columnar first reinforcing member 15. In addition, the rear end of the wall-shaped reinforcing member 25 is fixed to the wall-shaped reinforcing member 25 by attaching a reaction plate 27 (washer) placed on the outer surface of the wall-shaped reinforcing member 25 to the rear end of the wall-shaped reinforcing member 25 that has been passed through the hole. As a result, the wall-shaped reinforcing member 25 and the columnar first reinforcing member 15 are integrally connected by the rod-shaped reinforcing member 26. The connection of the rod-shaped reinforcing member 26 to the columnar first reinforcing member 15 is performed by methods such as engaging a hook (not shown) provided on the rod-shaped reinforcing member 26 with the columnar first reinforcing member 15, or engaging the rod-shaped reinforcing member 26 with the columnar first reinforcing member 15 using an appropriate fastener.

[0027] Figure 9 shows an example of the arrangement of the first columnar reinforcing body 15, the second columnar reinforcing body 16, the wall-like reinforcing body 25, and the rod-shaped reinforcing members 26. In the configuration shown in Figure 9, when viewed from the outside of the retaining wall, the first columnar reinforcing body 15 and the second columnar reinforcing body 16 are arranged alternately (staggered), and the wall-like reinforcing body 25 and the first columnar reinforcing body 15 are connected by the rod-shaped reinforcing members 26 at positions between the second columnar reinforcing bodies 16, thereby integrally fixing the wall-like reinforcing body 25 and the first columnar reinforcing body 15. It is also acceptable for the first columnar reinforcing body 15 and the second columnar reinforcing body 16 to be in the same position when viewed from the outside of the retaining wall.

[0028] Next, as shown in Figure 10, the formwork 32 is used to form a retaining wall 10 on the outside of the wall-like reinforcing body 25. The retaining wall 10 will be constructed by appropriate means, such as a concrete retaining wall or a stone retaining wall.

[0029] Next, as shown in Figure 11, the inside of the retaining wall 10 (the space between the columnar first reinforcing member 15 and the columnar second reinforcing member 16, which is separated from the outside by the wall-like reinforcing member 25) is backfilled with a filler material such as soil, lightweight mortar, or concrete to form a filled reinforcement section 28. Thus, the reinforced retaining wall 10 is completed.

[0030] According to the retaining wall reinforcement structure 1 and reinforcement method of the present invention, a filling reinforcement section 28 is provided between the columnar first reinforcement body 15 and the columnar second reinforcement body 16, and the rod-shaped reinforcing material 26 inserted from the wall-shaped reinforcement body 25 is connected to the columnar first reinforcement body 15. Therefore, it is possible to construct a new retaining wall 10 in the minimum area without having to demolish the building 11 near the collapse, and the construction period can also be shortened. Even collapsed stone retaining walls 30 can be reinforced as easily as possible.

[0031] While embodiments of the present invention have been described above, the present invention is not limited to these examples. It will be clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally also fall within the technical scope of the present invention. Furthermore, the effects described herein are merely descriptive or illustrative and not limiting. In other words, the technology relating to this disclosure may produce other effects that will be obvious to those skilled in the art from the description herein, in addition to or instead of the effects described above.

[0032] For example, in the above embodiment, an example was shown in which the tip of the rod-shaped reinforcing member 26 is connected to the columnar first reinforcing member 15. However, the rod-shaped reinforcing member 26 only needs to be connected to the columnar first reinforcing member 15, and may also be configured to penetrate the columnar first reinforcing member 15.

[0033] In the embodiment shown in Figure 12, as explained earlier in Figure 8, in the process of inserting the rod-shaped reinforcing member 26 from the wall-shaped reinforcing body 25 toward the columnar first reinforcing body 15, the tip of the rod-shaped reinforcing member 26 is inserted further into the ground than the columnar first reinforcing body 15, and the rod-shaped reinforcing member 26 and the columnar first reinforcing body 15 are connected by crossing them. In this case, for example, as shown in Figure 13, a hook 32 is attached to the front of the tip of the rod-shaped reinforcing member 26, and at the joint between the rod-shaped reinforcing member 26 and the columnar first reinforcing body 15 (shown by the dotted line 33 in Figure 12), the hook 32 can be engaged with the columnar first reinforcing body 15 (or the reinforcing bars 20 of the columnar first reinforcing body 15), thereby easily connecting the rod-shaped reinforcing member 26 and the columnar first reinforcing body 15.

[0034] Furthermore, while the configuration shown in Figure 9 illustrates an example where the first columnar reinforcing body 15 and the second columnar reinforcing body 16 are arranged alternately (staggered) when viewed from the outside of the retaining wall, the first columnar reinforcing body 15 and the second columnar reinforcing body 16 may be arranged in the same position when viewed from the outside of the retaining wall, and the rod-shaped reinforcing member 26 may be connected to both the first columnar reinforcing body 15 and the second columnar reinforcing body 16. Furthermore, while the example of forming the first columnar reinforcing body 15 and the second columnar reinforcing body 16 involved placing formwork in the drilled hole, filling it with concrete, mortar, etc., and then removing the formwork after it hardened, it is also acceptable to embed the structure as is without removing the formwork. Furthermore, while we have described the case of restoring a site where a collapsed stone retaining wall 30 has been constructed, this method can also be applied to newly formed retaining walls. [Industrial applicability]

[0035] This invention can be applied to reinforcing retaining walls formed in stepped terrain. [Explanation of symbols]

[0036] 1. Reinforcement structure of retaining walls 10 Retaining wall 11 Buildings 12 High ground 13 Low ground 15 Column-shaped first reinforcement body 16 Second columnar reinforcement 20 Reinforcement muscles 21 Rigid members 22 Reinforcement muscles 23 Rigid members 25 Wall-like reinforcing body 26. Rod-shaped reinforcing material 27 Reaction plate 28 Filling reinforcement part 30 Stone retaining wall 31 Drainage Mat 32 hooks 33. Joint between the rod-shaped reinforcing member and the columnar first reinforcing member

Claims

1. A columnar first reinforcing body formed vertically inside the retaining wall, A columnar second reinforcing body is formed vertically inside the retaining wall, outside the columnar first reinforcing body, A wall-like reinforcing body formed on the outside of the columnar second reinforcing body, A retaining wall reinforcing structure characterized by having a rod-shaped reinforcing member inserted from the wall-shaped reinforcing member toward the columnar first reinforcing member and connected to the columnar first reinforcing member.

2. The retaining wall reinforcement structure according to claim 1, characterized in that a retaining wall is formed on the outside of the wall-like reinforcing body.

3. The process involves forming a columnar first reinforcing body vertically in a position that will be inside the retaining wall, The process of forming a columnar second reinforcing body vertically in a position that is inside the retaining wall and outside the columnar first reinforcing body, The process of forming a wall-like reinforcing body on the outside of the columnar second reinforcing body, A method for reinforcing a retaining wall, characterized by comprising the step of inserting a rod-shaped reinforcing material from the wall-shaped reinforcing material toward the columnar first reinforcing material and connecting it to the columnar first reinforcing material.

4. A retaining wall reinforcement method according to claim 3, characterized by restoring the site of a collapsed retaining wall.

5. The retaining wall reinforcement method according to claim 3 or 4, characterized in that a retaining wall is formed on the outside of the wall-like reinforcing body.

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