Ground reinforcement structure and manufacturing method of the same

Abstract

To provide a ground reinforcement structure that can easily perform high-level reinforcement on soft ground.SOLUTION: In a ground reinforcement structure using a gabion, the gabion comprises a main body member that is approximately U-shaped when viewed from the side, side members, and a cover member. The main body member is made of welded wire mesh and has a bottom portion and a first upright portion and a second upright portion that rise upward from the bottom portion and face each other. Two main body members are connected together and placed on the ground with the first upright portions facing each other. A sheet member is placed above the bottom portion to prevent soil and sand from flowing into the gabion. Inside the gabion, filler material is packed inside the sheet member. An average spacing (a) of horizontal lines of the wire mesh that make up the second upright portion is smaller than a half of an average spacing (b) of horizontal lines of the wire mesh that make up the first upright portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ground reinforcement structure and a manufacturing method thereof. [Background technology]

[0002] When constructing or installing houses, retaining walls, buried pipes, etc. on soft ground, the so-called mattress method is used to reinforce the ground by installing or burying an artificial ground (mattress-like structure) made by wrapping a filler material such as crushed stone in geotextile on or in the surface layer of the ground.

[0003] In order to further increase the strength of the ground, it is preferable to excavate the soft ground and install a mattress-like structure on top of a strong supporting base, but if the amount of excavation required to reach the supporting base is large, the degree of reinforcement of the ground will need to be adjusted by adjusting the height and area of ​​the mattress-like structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-264718 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-90638 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-255247 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when mattress-like structures are formed by wrapping a filler material in geotextiles or the like, compaction of the filler material, which is made of crushed stone or the like, can be insufficient, resulting in insufficient reinforcement of the soft ground. This is because the filler material is wrapped in flexible geotextiles or the like, which deform during compaction. The final process of wrapping involves fastening the geotextiles wrapped around the filler material together with pins or the like, but this process can easily result in insufficient tension being applied to the geotextile, leading to loosening. The degree of loosening varies greatly depending on the skill of the person in charge of the process, and the looser the structure, the less compaction is achieved. Insufficient compaction causes the mattress-like structure to deform when a load is applied to it, defeating the purpose of reinforcing soft ground.

[0006] The present invention has been made in consideration of the above points, and its object is to provide a ground reinforcement structure that can easily provide a high degree of reinforcement to soft ground. [Means for solving the problem]

[0007] The ground reinforcement structure of the present invention is a ground reinforcement structure using a futon basket, which comprises a main body member that is approximately U-shaped when viewed from the side, side members, and a cover member, and the main body member is made of welded wire mesh and has a bottom portion and a first and second upright portion that rise upward from the bottom portion and face each other, and two of the main body members are connected together with the first upright portions facing each other and placed on the ground, and a sheet member is placed above the bottom portion to prevent soil and sand from flowing into the futon basket, and inside the futon basket, filler material is packed inside the sheet member, and the average spacing a of the horizontal lines of the wire mesh that make up the second upright portion is smaller than 1 / 2 of the average spacing b of the horizontal lines of the wire mesh that make up the first upright portion.

[0008] Before being connected, the main body member unit preferably has the first and second upright portions bent upward from the bottom portion, and the angles between the bottom portion and the first upright portion and the angles between the bottom portion and the first upright portion are greater than 90 degrees. In other words, the main body member is preferably made of a single wire mesh panel made of welded wire mesh and is formed by bending it.

[0009] It is preferable that the horizontal line at the top of the first vertical surface portion of the main body member and the horizontal line at the top of the second vertical surface portion are connected by a horizontal line connecting member.

[0010] The manufacturing method of the ground reinforcement structure of the present invention is a manufacturing method of a ground reinforcement structure using a futon basket having a main body member, side members, and a lid member, wherein the main body member is made of welded wire mesh and has a bottom portion and a first and second vertical portion that are folded from the bottom portion and rise upward facing each other, and the method includes an installation process in which the bottom portion is placed on the ground to install the main body portion, an vertical portion connecting process in which two of the main body members are connected to each other at the bottom of the first vertical portions, with the first vertical portions facing each other, a side connecting process in which the main body member and the side members are connected, a sheet installation process in which a sheet member is installed above the bottom portion to prevent soil and sand from flowing into the inside of the stone basket, a filling process in which filler material is placed inside the futon basket, and a lid connecting process in which the lid member is connected to the main body member and the side members.

[0011] In the single body member before being connected, it is preferable that the angle formed between the bottom surface portion and the first upright surface portion and the angle formed between the bottom surface portion and the first upright surface portion are greater than 90 degrees.

[0012] It is preferable that the average spacing a between the horizontal lines of the wire mesh that constitutes the second vertical section is smaller than half the average spacing b between the horizontal lines of the wire mesh that constitutes the first vertical section. [Effects of the Invention]

[0013] Since the ground reinforcement structure uses a futon basket, it can be easily installed on the ground, and since it is easy to add filler material and compact it, a high reinforcing effect can be obtained each time the ground reinforcement structure is manufactured. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. [Figure 2] FIG. 10 is a view of the main body member as seen from the rear side. [Figure 3] FIG. [Figure 4] This is a diagram showing two main body members lined up on the ground. [Figure 5] FIG. 10 is a diagram showing the first elevational portions of two main body members connected to each other. [Figure 6] 10A and 10B are diagrams illustrating a side connecting step for connecting the side member to the main body member. [Figure 7] 10A to 10C are diagrams illustrating a sheet installation process. [Figure 8] 10 is a diagram showing the connection between the first and second erection sections, and the connection between the side members and the first and second erection sections. FIG. [Figure 9] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] A futon basket is a cage made of wire mesh filled with stones, and traditionally, diamond-shaped wire mesh has been widely used. Since diamond-shaped wire mesh futon baskets tend to deform when filled with broken chestnut stones or other materials, and soil and sand leak into the interior, they have been considered unsuitable for use in the mattress method instead of geotextiles, and have not been used. The present inventors have conducted various studies on reinforcing structures for soft ground using futon baskets, leading to the present invention.

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0017] (Embodiment 1) The main body member that constitutes the futon basket according to embodiment 1 is shown in Figures 1 to 3. As shown in Figure 1, the main body member 10 is formed in a roughly U-shape when viewed from the side, and includes a bottom surface portion 16 that is placed on the ground, and a first upright surface portion 12 and a second upright surface portion 14 that rise upward from both ends of the bottom surface portion 16. The main body member 10 is made of welded wire mesh, and is formed by bending two places on a single wire mesh panel made of welded wire mesh.

[0018] In the main body 10 alone, the angle between the bottom surface 16 and the first upright surface 12 is greater than 90 degrees, and the angle between the bottom surface 16 and the second upright surface 14 is also greater than 90 degrees. Therefore, the main body 10 has a shape that widens upward when viewed from the side. Each angle is preferably in the range of 95 degrees to 105 degrees. Because of this shape, when transporting the main body 10, if the main body 10 is oriented in the direction shown in FIG. 1 (with the bottom surface 16 facing downwards), multiple main bodies 10 can be easily stacked. This makes it possible to load and transport many main bodies 10 in a small space, facilitating transportation and reducing transportation costs.

[0019] As shown in Figures 2 and 3, the first and second elevational sections 12 and 14 have the same spacing between adjacent vertical wire members 11 of the wire mesh panels, but different spacing between adjacent horizontal wire members 13 and 15. The average spacing a between the horizontal wire members 15 of the wire mesh constituting the second elevational section 14 is less than half the average spacing b between the horizontal wire members 13 of the wire mesh constituting the first elevational section 12. Specifically, in this embodiment, the spacing between the vertical wire members 11 and the horizontal wire members 13 in the first elevational section 12 is approximately the same, but the spacing between the vertical wire members 11 in the second elevational section 14 is just over three times the spacing between the horizontal wire members 15, so a is approximately one-third of b. With this configuration, when filler material such as crushed ore or single-grained crushed stone is placed in the futon basket, it is difficult for the filler material to pass through the mesh of the second elevational section 14, but it passes easily through the mesh of the first elevational section 12.

[0020] The length of the futon basket can be selected depending on the size of the ground to be reinforced, and multiple baskets can be connected longitudinally. The "longitudinal direction" here refers to the direction along which the boundary lines between the bottom surface 16 and the first and second vertical surfaces 12 and 14 extend. For example, in Figure 4, the main body 10 shown in Figures 1 to 3 is connected to a main body 10a that is longer in the longitudinal direction. The vertical wires 11 at the ends are connected together using a coiled wire (hereinafter referred to as a "coil").

[0021] Two main body members 10b, which have been connected and integrated in this manner, are placed side by side on the ground with their bottom surfaces 16 facing downwards (installation process). The ground on which they are installed may be soft ground that is exposed on the surface of the earth, or ground formed by excavating soft ground. Two integrated main body members 10b, 10b are placed on the ground with their first vertical surfaces 12 facing each other. Then, the coils 20 are used to connect the lowest horizontal wire members 13 of the first vertical surfaces 12 to each other (vertical surface connection process). As shown in FIG. 5, this connection allows the faces of the two first vertical surfaces 12 to overlap. When the integrated main body members 10b are used alone, the angle between the bottom surface 16 and the first vertical surfaces 12 is greater than 90 degrees. However, when the first vertical surfaces 12, 12 are pressed against each other to connect the lowest horizontal wire members 13, the angle between the bottom surface 16 and the first vertical surfaces 12 becomes 90 degrees after the connection.

[0022] Next, as shown in Fig. 6, side member 30 is connected to the side portion of main body member 10b using coils 20a and 20b (side connection step). Note that in Fig. 6, the side member connected to the right side is omitted for clarity. Side member 30 is preferably made of wire mesh, and more preferably made of welded wire mesh.

[0023] Then, as shown in Figure 7, the sheet member 40 is placed inside the futon basket (sheet placement process). The sheet member 40 is intended to prevent soil and sand from getting inside the futon basket, and is made of nonwoven fabric or the like. The sheet member 40 only needs to be placed on at least the bottom surface portion 16. In this embodiment, sheet members 40 are also placed on the inner surface side of the second upright surface portion 14 and the inner surface side (not shown) of the side surface member 30. Since the first upright surface portion 12 is not in direct contact with soil and sand, it is not necessary to place a sheet member 40 on it. In this embodiment, in order to ensure that the sheet member 40 is placed on the front surface of the bottom surface portion 16, only a small portion of the sheet member 40 is placed, and the remaining portion is placed on a portion of the lower side of the first upright surface portion 12.

[0024] Next, as shown in Figure 8, the first and second upright sections 12 and 14 of the main body member 10b are connected using horizontal wire connecting members 50 (horizontal wire connecting step). The sheet member 40 is omitted from Figure 8. The horizontal wire connecting members 50 are made of iron wire bent at both ends into hook shapes, and connect the uppermost horizontal wire member 13 of the first upright section 12 and the uppermost horizontal wire member 15 of the second upright section 14 by hooking them at the bent hook-shaped portions. The horizontal wire connecting members 50 are connected at regular intervals in the longitudinal direction of the main body member 10b.

[0025] Additionally, the uppermost horizontal wire member of the side surface member 30 and the uppermost horizontal wire member 13 of the first vertical surface portion 12, and the uppermost horizontal wire member of the side surface member 30 and the uppermost horizontal wire member 15 of the second vertical surface portion 14 are connected using diagonal connecting members 52. The diagonal connecting members 52 are similar to the horizontal wire connecting members 50, and are installed so as to extend diagonally relative to the longitudinal direction of the main body portion 10b and the direction perpendicular thereto.

[0026] The uppermost horizontal member 13 of the first elevation section 12 is provided with a connection concentration section 55 in which two horizontal line connecting members 50 and two diagonal connecting members 52 are installed adjacent to each other. Figure 9 is an enlarged view of the connection concentration section 55. Each of the two horizontal line connecting members 50 is hooked onto both of the two first elevation sections 12, and each of the two diagonal connecting members 52 is also hooked onto both of the two first elevation sections 12, and each of the two diagonal connecting members 52 is hooked onto both of the two first elevation sections 12, and each of the two diagonal connecting members 52 is also hooked onto both of the first elevation sections 12, and each of the first elevation sections 12 is therefore firmly connected to the second elevation section 14, and to the side member 30 and the first elevation section 12.

[0027] In this way, the connection is made using the horizontal line connecting member 50 and the diagonal connecting member 52, so that even if the filling material is stuffed inside the futon basket, the second upright portion 14 and the side member 30 can be prevented from bulging outward.

[0028] Then, filler material is placed inside the futon basket (filling process). Examples of filler materials include stones, crushed stone, crushed orchard, single-grain crushed stone, broken granular stones, and crushed concrete generated from demolished structures. Crushed orchard and single-grain crushed stone are preferred among them because they allow for thorough compaction. In this embodiment, single-grain crushed stone is used as the filler material. The single-grain crushed stone is poured up to the top of the first vertical section 12, second vertical section 14, and side member 30, and then leveled so that it is flush with these. This ensures sufficient compaction.

[0029] Next, the lid member is placed on top and connected to the main body member 10b and side member 30 (lid connecting process). The lid member is preferably made of wire mesh, more preferably welded wire mesh. Connection is preferably made using a coil, as this is simple and low cost. The lid member is connected to the main body portion 10b using the horizontal wire member 13 at the top of the first vertical portion 12 and the horizontal wire member 15 at the top of the second vertical portion 14.

[0030] The ground reinforcement structure of this embodiment is completed through the above process. Because the main body member 10b of the ground reinforcement structure of this embodiment is made of welded wire mesh, it acts as a mattress basket, increasing the binding force of the filler material. It also allows the filler material to be firmly compacted, and when a lid member is placed on top, it becomes a compacted ground reinforcement structure, increasing the degree of ground reinforcement. This structure can be formed regardless of the skill of the builder, so it is possible to manufacture a ground reinforcement structure with approximately the same structure and approximately the same degree of reinforcement each time it is constructed.

[0031] Furthermore, the average spacing a of the horizontal lines of the wire mesh that makes up the second elevational portion 14 is smaller than half the average spacing b of the horizontal lines of the wire mesh that makes up the first elevational portion 12, and therefore, coupled with the presence of the sheet member 40 on the inner side of the second elevational portion 14, the filler material cannot pass through the mesh, and the filler material does not leak out. On the other hand, the mesh of the first elevational portion 12 has a large area, allowing at least part of the filler material to pass through, and as a result, part of the filler material belongs to both of the two overlapping first elevational portions 12, promoting the integration of the two main body portions 10b and increasing the degree of ground reinforcement.

[0032] Furthermore, the horizontal wire member 13 at the top of the first vertical section 12 and the horizontal wire member 15 at the top of the second vertical section 14 are connected by horizontal wire connecting member 50, which prevents the futon basket from deforming (bulging) when the filler is poured in, and combined with the fact that the filler (single-grain crushed stone) is sufficiently compacted by pouring and leveling it, this results in a ground reinforcement structure with a sufficiently high degree of reinforcement. Furthermore, the side member 30 and main body member 10b are connected by diagonal connecting member 52, which more reliably prevents the futon basket from deforming.

[0033] (Embodiment 2) Since the second embodiment differs from the first embodiment in the contents of the filling material and filling process and the order of some of the processes, only the differences from the first embodiment will be explained below.

[0034] Crushers are used as the filling material in embodiment 2. In this embodiment, the filling process is carried out before the horizontal wire connecting process.

[0035] In this embodiment, where crusher run is used as the fill material in the filling process, the crusher run is poured up to about half the height of the first and second vertical sections 12, 14, and then compacted using a rammer or the like, and then poured up to the top of the first and second vertical sections 12, 14, where it is leveled so that it is flush with these and then compacted a second time using a rammer or the like. After the second compaction is completed, the horizontal line connecting process is carried out.

[0036] The second embodiment also provides the same effects as the first embodiment.

[0037] (Other embodiments) The above-described embodiments are merely examples of the present invention, and the present invention is not limited to these examples. These examples may be combined with well-known, commonly used, or publicly known technologies, or may be partially replaced. Modified inventions that would be easily conceived by a person skilled in the art are also included in the present invention.

[0038] The main body member may be made by combining multiple wire mesh panels. For example, the bottom portion, the first vertical portion, and the second vertical portion may each be separate wire mesh panels, and the main body member may be formed by connecting the bottom portion and the first vertical portion, and the bottom portion and the second vertical portion, respectively, with coils or the like. [Explanation of symbols]

[0039] 10 Main body member 10a Main body member 10b Main body member 12 First elevation 13 Horizontal wire member (horizontal wire) 14 Second elevation 15 Horizontal wire member (horizontal wire) 16 Bottom part 30 Side member 40 Sheet material 50 Horizontal wire connecting member

Claims

1. A ground reinforcement structure using a futon basket, The futon basket includes a main body member that is substantially U-shaped when viewed from the side, a side member, and a lid member, The main body member is made of welded wire mesh and has a bottom surface portion and a first upright surface portion and a second upright surface portion that rise upward from the bottom surface portion and face each other, The two main body members are connected to each other with the first elevation portions facing each other and installed on the ground, A sheet member is installed on the upper side of the bottom surface to prevent soil and sand from flowing into the inside of the futon basket, Inside the futon basket, a filling material is stuffed inside the sheet member, A ground reinforcement structure in which the average spacing a of the horizontal wires of the wire mesh constituting the second vertical surface portion is smaller than 1 / 2 of the average spacing b of the horizontal wires of the wire mesh constituting the first vertical surface portion.

2. The ground reinforcement structure described in claim 1, wherein before connection, the main body members have the first and second vertical portions bent from the bottom portion and rising upward, and the angle between the bottom portion and the first vertical portion and the angle between the bottom portion and the first vertical portion are greater than 90 degrees.

3. 2. The ground reinforcement structure according to claim 1, wherein the horizontal wire at the top of the first vertical surface portion of the main body member and the horizontal wire at the top of the second vertical surface portion are connected by a horizontal wire connecting member.

4. A method for manufacturing a ground reinforcement structure using a futon basket having a main body member, a side member, and a lid member, The main body member is made of welded wire mesh and has a bottom surface portion, and a first upright surface portion and a second upright surface portion that are bent upward from the bottom surface portion and face each other, an installation step of placing the bottom surface portion on the ground and installing the main body portion; an elevation portion connecting step of connecting two of the main body members to each other at lower parts of the first elevation portions, with the first elevation portions facing each other; a side connecting step of connecting the main body member and the side member; a sheet installation process for installing a sheet member on the upper side of the bottom surface portion to prevent soil and sand from flowing into the stone cage; a filling step of putting a filling material into the inside of the futon basket; a lid connecting step of connecting the lid member to the main body member and the side member; A method for manufacturing a ground reinforcement structure, comprising:

5. The method for manufacturing a ground reinforcement structure described in claim 4, wherein the main body member before connection has an angle between the bottom surface portion and the first vertical surface portion and an angle between the bottom surface portion and the first vertical surface portion that are greater than 90 degrees.

6. A method for manufacturing a ground reinforcement structure as described in claim 4, wherein the average spacing a of the horizontal lines of the wire mesh constituting the second vertical surface portion is smaller than 1 / 2 of the average spacing b of the horizontal lines of the wire mesh constituting the first vertical surface portion.

Images