Slope stabilization structure

Abstract

To make it possible to exhibit resistance force against both of initial movement of soil mass on a slope in a direction where pressure receiving plates separate from each other and initial movement of soil mass on the slope in a direction where the pressure receiving plates come closer to each other and reliably exhibit resistance force against initial movement of soil mass on the whole slope, in a slope stabilization structure in which the pressure receiving plates are fixed to projected portions of ground reinforcement materials.SOLUTION: In a slope stabilization structure, a plurality of column-like ground reinforcement materials 1 are driven toward a ground 100 from a slope 101 with intervals, pressure receiving plates 2 externally inserted into portions projected from the slope 101 of each of the ground reinforcement materials 1 to abut on the slope 101 are fixed to the ground reinforcement materials 1, one end part of a rigid connection member 3 is fixed to one pressure receiving plate 2, and the other end part of the rigid connection member 3 is fixed to another pressure receiving plate 2 arranged adjacent to the one pressure receiving plate 2 with an interval.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a slope stabilization structure that stabilizes a slope by driving columnar ground reinforcement materials into the ground. [Background technology]

[0002] Conventionally, a structure for stabilizing a slope by casting columnar ground reinforcement into the ground involves casting multiple columnar ground reinforcement materials at intervals into the slope of the ground, rigidly connecting the heads of the ground reinforcement materials by embedding them into reinforced concrete beams, and stabilizing the slope with a group of piles made up of multiple ground reinforcement materials (see Patent Documents 1 and 2).

[0003] This structure, in which the heads of the ground reinforcement materials are rigidly connected by reinforced concrete beams, has an excellent effect on stabilizing slopes, but since the reinforced concrete beams will crack if they cannot withstand the earth pressure when the slope moves, large-scale and precise design and construction are required, and there is also the problem that if the reinforced concrete beams crack, the scenery will be damaged.

[0004] Another structure for stabilizing slopes involves casting multiple columnar ground reinforcement materials at intervals into the slope of the ground, extrapolating a lattice-shaped FRP pressure plate to the part of the ground reinforcement that protrudes from the slope, and fastening the pressure plate to the protruding part of the ground reinforcement with nuts (see Patent Document 3). This structure transmits the pull-out resistance force of the ground reinforcement material to the surface of the slope via the pressure plate, providing resistance to the earth pressure of the soil mass moving down the slope, and does not cause the problem of cracks in reinforced concrete beams as described above. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-275907 [Patent Document 2] Japanese Patent Application Publication No. 2017-128921 [Patent Document 3] Patent No. 5356918 Summary of the Invention [Problem to be solved by the invention]

[0006] When constructing a structure in which pressure plates are fastened to the protruding portions of the ground reinforcement with nuts, the pressure plates inserted onto the protruding portions of each ground reinforcement are usually installed unconnected or connected with wire ropes that are constantly tensile. However, when the pressure plates are installed unconnected, they cannot provide resistance to the initial movement of the soil mass on the slope in the direction of moving away from each other or in the direction of moving toward each other. Furthermore, when the pressure plates are connected with wire ropes that are constantly tensile, although they can provide resistance to the initial movement of the soil mass on the slope in the direction of moving away from each other, they cannot provide resistance to the initial movement of the soil mass on the slope in the direction of moving toward each other. As a result, they are unable to provide resistance to the initial movement of the soil mass on the entire slope.

[0007] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide a slope stabilization structure in which pressure plates are fixed to the protruding parts of ground reinforcement material, which can exert resistance to both the initial movement of the soil mass on the slope in the direction in which the pressure plates move away from each other and the initial movement of the soil mass on the slope in the direction in which the pressure plates move closer to each other, and can reliably exert resistance to the initial movement of the soil mass on the entire slope. [Means for solving the problem]

[0008] The slope stabilization structure of the present invention is characterized in that a plurality of columnar ground reinforcement members are driven into the ground at intervals from the slope, a pressure plate is inserted onto the protruding portion of each ground reinforcement member from the slope and abuts against the slope, and is fixed to the ground reinforcement members, one end of a rigid connecting member is fixed to the first pressure plate, and the other end of the rigid connecting member is fixed to a second pressure plate arranged adjacent to the first pressure plate at a distance. According to this method, by fixing one end of a rigid connecting member to a first pressure plate and a second pressure plate arranged adjacent to each other with a gap between them, and by connecting the first pressure plate and the second pressure plate with the rigid connecting member, resistance can be exerted against both the initial movement of the soil mass on the slope in the direction in which the pressure plates move away from each other and the initial movement of the soil mass on the slope in the direction in which the pressure plates move toward each other. Therefore, in a slope stabilization structure in which pressure plates are fixed to the protruding portions of columnar ground reinforcement, resistance can be reliably exerted against the initial movement of the soil mass on the entire slope. Furthermore, unlike a structure in which the heads of the ground reinforcement are rigidly connected with reinforced concrete beams, this method does not require large-scale construction and can be easily installed. Furthermore, it is not only applicable to the construction of a new slope stabilization structure from scratch, but also to the construction of a slope reinforcement structure in which ground reinforcement and pressure plates have already been installed by retrofitting the rigid connecting member, making it highly versatile.

[0009] The slope stabilization structure of the present invention is characterized in that a plurality of columnar ground reinforcement members are driven into the ground at intervals from the slope, a pressure plate is fixed to each of the ground reinforcement members so as to be inserted into the protruding portion of each of the ground reinforcement members from the slope and abut against the slope, a connecting body consisting of a plurality of rigid connecting members fixed in the longitudinal direction and connected in series is provided between a first pressure plate and a second pressure plate arranged adjacent to the first pressure plate at a distance, and the tip of the rigid connecting member located at one end of the connecting body is fixed to the first pressure plate, and the tip of the rigid connecting member located at the other end of the connecting body is fixed to the first pressure plate. According to this method, by fixing a rigid connecting member of a connecting assembly, in which multiple rigid connecting members are fixed longitudinally, to a first pressure plate and a second pressure plate arranged adjacent to each other with a gap in between, and connecting the first pressure plate and the second pressure plate with the connecting assembly, resistance can be exerted against both the initial movement of the soil mass on the slope in the direction in which the pressure plates move away from each other and the initial movement of the soil mass on the slope in the direction in which the pressure plates move toward each other. Therefore, in a slope stabilization structure in which pressure plates are fixed to the protruding portions of columnar ground reinforcement, resistance can be reliably exerted against the initial movement of the soil mass on the entire slope. Furthermore, by arranging multiple rigid connecting members longitudinally and using a connecting assembly that secures the rigid connecting members to each other, it is possible to install the connecting assembly so that it roughly follows the unevenness of the slope when the slope is uneven. Furthermore, unlike a structure in which the heads of the ground reinforcement members are rigidly connected by reinforced concrete beams, this method does not require large-scale construction and is easy to install. Furthermore, this method is highly versatile, as it can be used not only when constructing a new slope stabilization structure from scratch, but also when constructing a slope stabilization structure by retrofitting multiple rigid connecting members or connecting bodies onto a slope reinforcement structure that has already been fitted with ground reinforcement materials and pressure plates.

[0010] The slope stabilization structure of the present invention is characterized in that the pressure plate and the rigid connecting member are made of a lattice material, a fixing plate is installed between a first fitting piece fitted into the mesh of the pressure plate, which is the lattice material, and a second fitting piece fitted into the mesh of the rigid connecting member, which is the lattice material, and the fixing plate is fixed to the first fitting piece and also to the second fitting piece, thereby fixing the pressure plate and the rigid connecting member. According to this, by constructing the pressure plate and rigid connecting member from a lattice material, it is possible to allow for good vegetation to grow on the slope, and eventually the pressure plate and rigid connecting member will be covered with grass and trees and become invisible, resulting in a beautiful landscape. Furthermore, by utilizing the mesh of the pressure plate and rigid connecting member, which are lattice materials, the pressure plate and rigid connecting member can be easily fixed using fitting pieces and fixing plates. Furthermore, because the fitting pieces that fit into the mesh are small, only a small area is required for storage and transportation, reducing storage and transportation costs and improving handling during transportation and installation.

[0011] The slope stabilization structure of the present invention is characterized in that a flat first fixed plate and a Z-shaped bent second fixed plate are installed between the first mating piece and the second mating piece, and the first fixed plate and the second fixed plate are fixed to the first mating piece and to the second mating piece, thereby fixing the pressure plate and the rigid connecting member, and the rigid connecting member is sandwiched between the first fixed plate and the second fixed plate. According to this, by clamping and connecting the rigid connecting member between a flat first fixed plate and a Z-shaped bent second fixed plate, the fixing strength and stability of the fixed state between the pressure-receiving plate and the rigid connecting member can be further increased.

[0012] The slope stabilization structure of the present invention is characterized in that the pressure plate and the rigid connecting member are made of a lattice material that is made of the same material and has meshes of the same size. According to this, by constructing the pressure plate and rigid connecting member from lattice material, it becomes possible to have good vegetation on the slope, and eventually the pressure plate and rigid connecting member will be covered with grass and trees and become invisible, realizing a beautiful landscape. Also, by constructing the pressure plate and rigid connecting member from lattice material that is made of the same material and has the same mesh size, it is possible to manufacture the pressure plate and rigid connecting member on the same manufacturing line, and the overall manufacturing cost of the pressure plate and rigid connecting member can be significantly reduced.

[0013] The slope stabilization structure of the present invention is characterized in that the pressure plate is made of a lattice material made of fiber-reinforced resin, the ground reinforcement material is inserted into a penetration formed in the pressure plate made of the lattice material so that the head of the ground reinforcement material protrudes from the pressure plate, and a filler material is filled in the mesh of the lattice around the penetration part of the pressure plate. According to this, constructing the pressure plate from a lattice material allows for good vegetation on the slope, and eventually the pressure plate becomes covered with grass and trees and becomes invisible, resulting in a beautiful landscape. Also, by filling the mesh of the lattice around the penetration part of the pressure plate, which is a lattice material made of fiber-reinforced resin, with a filler and sealing the cavities in the mesh around the penetration part of the pressure plate, the rigidity of the part of the pressure plate where the load of the ground reinforcement material is most strongly applied can be improved, and the strong slope reinforcement effect of the ground reinforcement material can be obtained while taking advantage of the construction benefits and landscape benefits of a pressure plate made of a lightweight fiber-reinforced resin lattice material.

[0014] The slope stabilization structure of the present invention is characterized in that the displacement in the connecting direction between the rigid connecting member and the pressure plate in response to the same tensile force and the same compressive force is larger in the connecting portion between the first pressure plate and the second pressure plate than in the pressure plate. With this, the connecting parts between the pressure plates displace more greatly in response to tensile and compressive forces than the pressure plates themselves, so that when deformation occurs in the soil mass on the slope, the connecting parts can stretch slightly and follow the slope deformation.The connecting structure between the underground ground reinforcement material and the pressure plates on the slope - rigid connecting members or connecting bodies allows the entire slope to be flexibly reinforced as a large, integrated soil mass. [Effects of the Invention]

[0015] According to the slope stabilization structure of the present invention, in a slope stabilization structure in which pressure plates are fixed to the protruding parts of the ground reinforcement material, resistance is exerted against both the initial movement of the soil mass on the slope in the direction in which the pressure plates move away from each other and the initial movement of the soil mass on the slope in the direction in which the pressure plates move closer to each other, and resistance can be reliably exerted against the initial movement of the soil mass on the entire slope. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic perspective view showing a slope stabilization structure according to an embodiment of the present invention; [Figure 2] 1 is a schematic bird's-eye view of a ground reinforcement member, a pressure plate, and a rigid connecting member in a slope stabilization structure according to an embodiment. [Figure 3]1 is a perspective view showing the vicinity of a connection point between a pressure plate and a rigid connecting member in a slope stabilization structure according to an embodiment. FIG. [Figure 4] FIG. 2 is a longitudinal cross-sectional view showing the periphery of a protruding portion of a ground reinforcement material in the slope stabilization structure of the embodiment. [Figure 5] FIG. 10 is a perspective explanatory view showing a first fixing plate, a second fixing plate, a fixing device on the pressure-receiving plate side, and a fixing device on the rigid connecting member side. [Figure 6] FIG. 10 is a perspective explanatory view illustrating the connection between the pressure-receiving plate and the rigid connecting member by the first fixed plate and the second fixed plate. [Figure 7] FIG. 10 is an explanatory plan view illustrating connection by a rigid connecting member when the positions of adjacent pressure receiving plates are misaligned. [Figure 8] FIG. 10 is a plan view showing a connecting body in which a plurality of rigid connecting members used in a modified slope stabilization structure are fixed in the longitudinal direction and connected in series. [Figure 9] A diagram of the testing equipment used to perform a tensile test on a test specimen with a rigid connecting member fixed to a pressure plate. [Figure 10] 1 is a graph showing a load-displacement curve obtained from a tensile test on a test specimen. DETAILED DESCRIPTION OF THE INVENTION

[0017] [Slope stabilization structure of the embodiment] 1 to 4, a slope stabilization structure according to an embodiment of the present invention comprises a plurality of columnar ground reinforcements 1 driven from a slope 101 toward the ground 100 and arranged at intervals from one another, and pressure plates 2 that are fitted onto the protruding portion of each ground reinforcement 1 from the slope 101 and come into contact with the slope 101, and the pressure plates 2 are fixed to the ground reinforcements 1. One end of a rigid connecting member 3 is fixed to one pressure plate 2, and the other end of this rigid connecting member 3 is fixed to another pressure plate 2 that is arranged adjacent to the first pressure plate 2 at an interval.

[0018] The ground reinforcement material 1 in this embodiment includes a steel pipe 11 that functions as a casing pipe during drilling and is left in the ground 100 after drilling; a reinforcing bar 12, such as a threaded reinforcing bar, placed inside the steel pipe 11; a reinforcing sleeve 13 that is screwed into the reinforcing bar 12 to a certain depth where a large load is applied; and an injection material 14, such as cement milk, injected into the ground 100 inside and outside the steel pipe 11. The steel pipe 11 is buried in the ground 100 over its entire length. The reinforcing bar 12 protrudes from the slope 101, and the reinforcing sleeve 13 protrudes from the slope 101 up to a point halfway along the protruding portion of the reinforcing bar 12. In this example, the protruding portion of the ground reinforcement material 1 is composed of the protruding portion of the reinforcing bar 12 and the protruding portion of the reinforcing sleeve 13. The multiple ground reinforcements 1, arranged at intervals from one another, integrate the entire slope 101, including the ground 100, to the depth of the ground reinforcement material 1, thereby suppressing slope collapse.

[0019] The pressure plate 2 in this embodiment is made of a lattice material in which vertical walls 21 are provided at intervals and meshes 22 are defined by the vertical walls 21, and the entire pressure plate 2 has a rectangular shape such as a square in plan view. In the center of the pressure plate 2, a through hole 23 is formed that has a shape such as a square in plan view with the central vertical wall 21 removed, and in this embodiment, the through hole 23 corresponds to four meshes 22, meaning that its size in plan view is larger than the meshes 22. Each pressure plate 2 is placed on a leveling material such as a palm mat (not shown) laid on the slope 101. In this embodiment, the pressure plate 2 is inserted into the ground reinforcement 1 so that the penetration 23 is inserted into the protruding portion of the reinforcing bars 12 and the reinforcing sleeve 13 in the ground reinforcement 1 that protrudes from the slope 101, and the remaining gap of the penetration 23 is filled with half coupler assemblies 41, 41, etc., which are pre-formed in advance using resin mortar or the like to match the shape of the remaining portion, and the head of the ground reinforcement 1, which is made up of part of the reinforcing bars 12 and the reinforcing sleeve 13, is arranged so that it protrudes from the pressure plate 2. The upright wall 21 of the pressure plate 2 is erected from the slope 101, and the pressure plate 2 abuts against the slope 101 via a leveling material. The pressure plate 2 is a rigid member that has the shape-retaining ability to maintain a certain shape and elastic recovery when subjected to an external force below a predetermined value, and is formed from a fiber-reinforced resin such as FRP, which is lighter than concrete.

[0020] Furthermore, around the portion of the ground reinforcement 1 that protrudes from the slope 101, the mesh 22 of the latticework around the penetration 23 of the pressure plate 2 is filled with a filler 4 such as resin mortar. The mesh 22 outside the periphery of the penetration 23 of the pressure plate 2 is not filled with filler 4, and the other mesh 22 of the latticework around the pressure plate 2 made of fiber-reinforced resin are not blocked and are left hollow. This structure enables effective reinforcement by increasing the rigidity of the center portion of the ground reinforcement 1 where the load is applied. In addition, instead of the method of fitting the aforementioned half coupler assembly 41, 41 into the remaining portion of the penetration portion 23 where the reinforcing bars 12 and reinforcing sleeve 13 of the ground reinforcement material 1 have been inserted, the filler 4 to be filled into the lattice mesh 22 around the penetration portion 23 may be filled into the remaining portion of the penetration portion 23 during on-site construction, and the filler 4 may be filled into both the outer periphery of the reinforcing bars 12 and reinforcing sleeve 13 of the penetration portion 23 and the mesh 22 around the penetration portion 23.

[0021] A lower support plate 15 made of steel or the like and an upper support plate 16 made of steel or the like are extrapolated onto the protruding portion of the ground reinforcement material 1 on the side opposite the slope 101 side of the pressure plate 2, and nuts 17 are screwed onto the protruding portions of reinforcing bars 12 such as threaded nodular steel bars protruding from the upper support plate 16, so that the upper support plate 16 and the lower support plate 15 press the pressure plate 2 against the slope 101. The protruding portions of the reinforcing bars 12 protruding from the upper support plate 16 and the outside of the nuts 17 are covered with protective caps 18 which have functions such as rust prevention.

[0022] In this embodiment, the rigid connecting member 3 is composed of a lattice material with vertical walls 31 spaced apart from one another and defining a mesh 32, and has an elongated rectangular shape in plan view. The rigid connecting member 3 is a rigid member that has the shape retention to maintain a certain shape and elastic recovery when subjected to an external force below a predetermined value, and is made of a material lighter than concrete, such as FRP. The rigid connecting member 3 in this embodiment is made of the same material as the pressure plate 2, is composed of a lattice material with mesh 32 of the same dimensions as the mesh 22 of the pressure plate 2, and is formed to the same thickness as the pressure plate 2. Depending on the unevenness of the slope 101, the rigid connecting member 3 may be placed on an unevenness leveling material such as a coconut mat (not shown), similar to the pressure plate 2.

[0023] 3, 5 and 6, fitting pieces 51, 52 and elongated fixing plates 61, 62 made of metal or the like are used to fix the pressure plate 2 and the rigid connecting member 3, the fitting piece 51 is fitted into the mesh 22 around the end of the pressure plate 2, which is a lattice material, and the fitting piece 52 is fitted into the mesh 32 around the end in the longitudinal direction of the rigid connecting member 3, which is a lattice material, and the fixing plates 61, 62 are installed between the fitting pieces 51 and the fitting pieces 52. The fixing plates 61, 62 are fixed to the fitting pieces 51 and the fitting pieces 52, whereby the pressure plate 2 and the rigid connecting member 3 are fixed together.

[0024] In the illustrated example, a flat fixing plate 61 and a Z-shaped fixing plate 62 are respectively mounted on a fitting piece 51 fitted into the mesh 22 around the end of the pressure plate 2 and a fitting piece 52 fitted into the mesh 32 around the longitudinal end of the rigid connecting member 3, and the fixing plate 61 and the fixing plate 62 are fixed to the fitting piece 51 and the fitting piece 52, respectively, thereby fixing the pressure plate 2 and the rigid connecting member 3, and the rigid connecting member 3 is sandwiched between the flat fixing plate 61 and the Z-shaped fixing plate 62.

[0025] The flat fixing plate 61 and the Z-shaped fixing plate 62 have bolt insertion holes 611, 621 formed in positions corresponding to the fitting pieces 51 fitted into the mesh 22 of the pressure-receiving plate 2 and the fitting pieces 52 fitted into the mesh 32 of the rigid connecting member 3, respectively. The bolt insertion holes 611, 621 are elongated holes that are slightly longer in the longitudinal direction of the fixing plates 61, 62 to enable smooth bolt insertion. Furthermore, the fitting pieces 51 fitted into the mesh 22 of the pressure-receiving plate 2 have a female screw hole 511 formed therein, and the fitting pieces 52 fitted into the mesh 32 of the rigid connecting member 3 have a through hole 521 formed therein.

[0026] On the opposite side of the inclined surface 101 of the fitting piece 51 fitted into the mesh 22 of the pressure plate 2, one side area of ​​the Z-shaped fixing plate 62 and one side area of ​​the flat fixing plate 61 are stacked, and a fully threaded fixing bolt 71 is inserted through the bolt insertion hole 621 of the fixing plate 62 arranged at a position corresponding to the fitting piece 51 and the bolt insertion hole 611 of the fixing plate 61, and is screwed into the female threaded hole 511 of the fitting piece 51, and the fixing plates 61, 62 are fixed to the pressure plate 2 by tightening a nut 73 onto the fixing bolt 71 via a washer 72.

[0027] In addition, one end of the rigid connecting member 3, in which the engaging piece 52 is internally fitted into the mesh 32, is inserted into the gap between the other side area of ​​the Z-shaped fixing plate 62 and the other side area of ​​the flat fixing plate 61, and the other side area of ​​the Z-shaped fixing plate 62 and the other side area of ​​the flat fixing plate 61 are respectively arranged on both sides of one end of the rigid connecting member 3.

[0028] The shank of a headed fixing bolt 81 is inserted into a bolt insertion hole 621 of the fixing plate 62 arranged at a position corresponding to the fitting piece 52, the through hole 521 of the fitting piece 52, and the bolt insertion hole 611 of the fixing plate 61 arranged at a position corresponding to the fitting piece 52, and the fixing plates 61, 62 are fixed to the rigid connecting member 3 by tightening the nut 83 onto the fixing bolt 81 via a washer 82 on the head side of the fixing bolt 81 and a washer 84 on the nut 83 side. In other words, the fixing plates 61, 62 are fixed to the rigid connecting member 3 so that the fixing plate 61, the rigid connecting member 3, and the fixing plate 62 are sandwiched between the head of the fixing bolt 81 and the nut 83.

[0029] When one end of the rigid connecting member 3 is fixed to one pressure plate 2 and the other end of the rigid connecting member 3 is fixed to another pressure plate 2 arranged adjacent to the first pressure plate 2 at a distance, the same configuration as above is used to fix them using the fitting pieces 51, 52, fixing plates 61, 62, fixing bolts 71, 81, and nuts 73, 83. By connecting one pressure plate 2 to another pressure plate 2 with the rigid connecting member 3 in this manner, the slope stabilization structure of this embodiment is constructed. In the illustrated example, the slope stabilization structure is constructed by connecting one pressure plate 2 to another pressure plate 2 with the rigid connecting member 3 so that the rigid connecting members 3 are fixed at two locations with a distance between them on each side edge of each pressure plate 2.

[0030] In this embodiment, the rigid connecting member 3 is made of the same material as the pressure plate 2 and is composed of a lattice material having mesh 32 of the same dimensions as the mesh 22 of the pressure plate 2, and the rigid connecting member 3 is an elongated rectangular member for the square pressure plate 2. The mesh 22 around the penetration portion 23 in the pressure plate 2, i.e., the insertion portion of the ground reinforcement material 1, is filled with a filler 4 such as resin mortar to selectively close the mesh 22 and improve the rigidity of the relevant portion. This structure allows the rigid connecting member 3 and the pressure plate 2 to have the same displacement and strength against the same tensile force in the connecting direction. With regard to displacement due to the same compressive force, it is preferable to set the displacement of the connecting portion between one pressure plate 2 and another pressure plate 2, in other words, the connecting portion consisting of the rigid connecting member 3, the portion connecting one end of the rigid connecting member 3 to one pressure plate 2, and the portion connecting the other end of the rigid connecting member 3 to the other pressure plate 2 that is arranged between the one pressure plate 2 and the other pressure plate 2, to be larger than the displacement of the pressure plate 2 in which the ground reinforcement material 1 is arranged and fixed and whose rigidity is increased by the filler material 4.

[0031] By setting it up in this way, the connecting parts between the pressure plates 2, 2, which are made up of the rigid connecting member 3, are displaced more by tensile and compressive forces than the pressure plate 2, so that when deformation occurs in the slope soil mass, the connecting parts can stretch slightly to follow the slope deformation.The connecting structure of the ground reinforcement material 1 in the ground 100 and the pressure plate 2-rigid connecting member 3 on the slope 101 allows the entire slope to be flexibly reinforced as a large, integrated soil mass.

[0032] Furthermore, as shown by the dotted line in Figure 7, if one ground reinforcement material 1 and one pressure plate 2 extrapolated to its protruding portion, and another ground reinforcement material 1 and another pressure plate 2 extrapolated to its protruding portion are arranged next to each other with a gap between them, and the positions of the one pressure plate 2 and the other pressure plate 2 are misaligned in the vertical or horizontal direction, etc., it is preferable to adjust the mesh 22 of the one pressure plate 2 to which one end of the rigid connecting member 3 is fixed and the mesh 22 of the other pressure plate 2 to which the other end of the rigid connecting member 3 is fixed so that they are meshes 22 in different positions.

[0033] According to the slope stabilization structure of this embodiment, one end of the rigid connecting member 3 is fixed to one pressure plate 2 and the other pressure plate 2, which are arranged adjacently with a gap between them, and the rigid connecting member 3 connects the pressure plates 2 to the other pressure plate 2. This allows resistance to both the initial movement of the soil mass on the slope in the direction in which the pressure plates 2 move away from each other and the initial movement of the soil mass on the slope in the direction in which the pressure plates 2 move toward each other. Therefore, in a slope stabilization structure in which the pressure plates 2 are fixed to the protruding portions of the columnar ground reinforcement members 1, resistance to the initial movement of the soil mass on the entire slope can be reliably exerted. Furthermore, unlike a structure in which the heads of the ground reinforcement members 1 are rigidly connected with reinforced concrete beams, this structure does not require large-scale construction and can be easily constructed. Furthermore, it is not only applicable to the construction of a new slope stabilization structure from scratch, but also to the construction of a slope stabilization structure by retrofitting the rigid connecting member 3 to a slope reinforcement structure that already has ground reinforcement members 1 and pressure plates 2 installed. This has excellent versatility.

[0034] Furthermore, constructing the pressure plate 2 and the rigid connecting member 3 from a lattice material allows for good vegetation to grow on the slope, eventually obscuring the pressure plate 2 and the rigid connecting member 3 with grass and trees, resulting in a beautiful landscape. Furthermore, utilizing the meshes 22, 32 of the pressure plate 2 and the rigid connecting member 3, which are lattice materials, the pressure plate 2 and the rigid connecting member 3 can be easily secured together using the interlocking pieces 51, 52 and the fixing plates 61, 62. Furthermore, because the interlocking pieces 51, 52 that fit into the meshes 22, 32 are small, they require a small footprint during storage and transportation, reducing storage and transportation costs and improving handling during transportation and installation. Furthermore, sandwiching and connecting the rigid connecting member 3 between the flat fixing plate 61 and the Z-shaped fixing plate 62 enhances the strength and stability of the fixed state between the pressure plate 2 and the rigid connecting member 3.

[0035] Furthermore, by constructing the pressure plate 2 and the rigid connecting member 3 from lattice material made of the same material and having meshes 22, 32 of the same dimensions, the pressure plate 2 and the rigid connecting member 3 can be manufactured using the same manufacturing line, which significantly reduces the overall manufacturing cost of the pressure plate 2 and the rigid connecting member 3.

[0036] Furthermore, by filling and sealing the mesh 22 around the penetrations 23 of the pressure plate 2 with the filler 4, the rigidity of the areas of the pressure plate 2 that receive a large load from the ground reinforcement material 1 can be improved and reinforced in a focused manner. This makes it possible to take advantage of the construction benefits of the pressure plate 23 being made of a lightweight fiber-reinforced resin lattice material and the scenic benefits of being able to expect vegetation to grow through the lattice mesh 22, while also achieving an effective reinforcement effect by combining the strong slope reinforcement effect of the individual ground reinforcement materials 1 with the integration of the entire slope by the rigid connecting members 3.

[0037] [Slope stabilization structure according to a modified embodiment] In order to accommodate unevenness of the slope 101 when it is uneven, a modified slope stabilization structure is also suitable, as shown in Fig. 8, in which a connecting body 30, in which a plurality of rigid connecting members 3 are fixed and connected in the longitudinal direction, is used to connect one pressure plate 2 to another pressure plate 2. In the connecting body 30, a fitting piece 52 having a through hole 521 is fitted into the mesh 32 at one end of one rigid connecting member 3 and the other end of another adjacent rigid connecting member 3, and flat fixing plates 61, 61 are arranged on both sides of one end of one rigid connecting member 3 and the other end of another adjacent rigid connecting member 3.

[0038] Then, the shank of a headed fixing bolt 81 is inserted into the through hole 521 of the fitting piece 52 and the bolt insertion holes 611, 611 of the fixing plates 61, 61 that are arranged on both sides of the fitting piece 52 in positions corresponding to the fitting piece 52, and as in the above configuration, by tightening the nut 83 onto the fixing bolt 81 via the washer 82 on the head side of the fixing bolt 81 and the washer 84 on the nut 83 side, the fixing plates 61, 61 are fixed to one rigid connecting member 3 and another adjacent rigid connecting member 3, and one rigid connecting member 3 and another adjacent rigid connecting member 3 are connected together.

[0039] In the modified slope stabilization structure, a connecting body 30 is provided between one pressure plate 2 and another pressure plate 2 arranged adjacent to the first pressure plate 2 with a gap therebetween, and a tip of a rigid connecting member 3 located on one end side of the connecting body 30 is fixed to the first pressure plate 2, and a tip of a rigid connecting member 3 located on the other end side of the connecting body 30 is fixed to the other pressure plate 2, thereby connecting the first pressure plate 2 and the other pressure plate 2 via the connecting body 30. The configuration for fixing the tip of each rigid connecting member 3 to the pressure plate 2 is similar to the configuration for fixing one end of the rigid connecting member 3 to the first pressure plate 2 in the above embodiment.

[0040] According to the modified slope stabilization structure, by fixing a rigid connecting member 3 of a connecting body 30, which has a plurality of rigid connecting members 3 fixed longitudinally, to one pressure plate 2 and another pressure plate 2 that are arranged adjacent to each other with a gap in between, and connecting the one pressure plate 2 and the other pressure plate 2 with the connecting body 30, it is possible to exert resistance to both the initial movement of the soil mass on the slope in the direction in which the pressure plates 2 move away from each other and the initial movement of the soil mass in the direction in which the pressure plates 2 move toward each other. Therefore, in a slope stabilization structure in which pressure plates 2 are fixed to the protruding parts of columnar ground reinforcement 1, it is possible to reliably exert resistance to the initial movement of the soil mass on the entire slope.

[0041] Furthermore, by using a connector 30 that arranges a plurality of rigid connecting members 3 in the longitudinal direction and fixes the rigid connecting members 3 to each other, when the slope 101 is uneven, the connector 30 can be installed by adjusting it so that it roughly follows the unevenness of the slope 101. In addition, even in the modified slope stabilization structure, the same effects can be obtained from the configuration corresponding to the above embodiment.

[0042] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the inventions listed as inventions, the above-mentioned embodiments, and the above-mentioned modifications, to the extent applicable, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept.The inventions disclosed in this specification also include the following contents and modifications.

[0043] For example, the columnar ground reinforcement material and pressure plate in the slope stabilization structure of the present invention are not limited to the ground reinforcement material 1 and pressure plate 2 of the above embodiment, but can be any appropriate columnar ground reinforcement material and pressure plate used in slope stabilization structures within the applicable range.

[0044] The rigid connecting member used in the slope stabilization structure of the present invention can be made of a material different from that of the pressure plate, and can be made of a lattice material having a mesh size different from that of the pressure plate made of a lattice material.The rigid connecting member used in the slope stabilization structure of the present invention can also be an elongated member having a structure different from that of the pressure plate made of a lattice material, and having lower longitudinal tensile axial rigidity and longitudinal compressive axial rigidity than the pressure plate.

[0045] Furthermore, the structure for fixing the pressure plate and the rigid connecting member in the slope stabilization structure of the present invention is not limited to the fixing structure in the above embodiment, and may be any suitable structure within the scope of the present invention.Furthermore, the structure of the fixing plate for fixing the pressure plate and the rigid connecting member is not limited to the fixing plates 61 and 62 in the above example, and may be any suitable structure within the scope of the present invention.

[0046] Furthermore, the fitting piece 51 can be inserted into the mesh 22 from the underside of the pressure plate 2, i.e., from the side of the slope 101, while temporarily holding the pressure plate 2 above the slope 101. In this case, the bolt 71 and fitting piece 51 may be pre-assembled together, or an integrally molded product may be used.

[0047] [Mock test example] A full-scale experiment was conducted to confirm the performance of the actual pressure plates, interlocking pieces, and rigid connecting members. The initial movement of the slope soil mass can occur when the pressure plates approach or move away from each other, but in both cases the direction of the force simply reverses, and destruction spreads from localized areas to the entire area, so it is possible to confirm this by focusing on the strength of the interlocking pieces, grids, and mesh, which are the areas where localized destruction occurs.

[0048] Therefore, as shown in Figure 9, two rectangular parallelepiped concrete blocks 201 were placed side by side, rock bolts 202 were driven into one of the concrete blocks 201 as ground reinforcement, penetration parts 23 were inserted into the rock bolts 202, and a pressure plate 2 was installed, and resin concrete 203 was filled into the mesh 22 corresponding to an 8x8 pattern in the center of the pressure plate 2 and allowed to harden, and resin concrete 203 was also filled into the penetration parts 23 and allowed to harden, thereby fixing the rock bolts 202 and the pressure plate 2. The length and width of the pressure plate 2 are 967 mm x 967 mm.

[0049] On the other side of the pressure plate 2 facing the concrete mass 201, a rigid connecting member 3 is placed. The rigid connecting member 3 is made of the same FRP material as the pressure plate 2, has mesh 32 of the same dimensions as the mesh 22 of the pressure plate 2, and has the same thickness as the pressure plate 2. The pressure plate 2 and one end of the rigid connecting member 3 are fixed together using the same configuration as in the above embodiment, in which one end of the rigid connecting member 3 is fixed to one pressure plate 2 using mating pieces 51, 52 and fixing plates 61, 62. The rigid connecting member 3 has a width of 127 mm and a length of 607 mm.

[0050] At the other end of the rigid connecting member 3, a mating piece 52 was fitted into the mesh 32, and the shanks of fixing bolts 81 were inserted into the through-holes 521 of the mating piece 52 and the bolt insertion holes 611 of the fixing plates 61, 61 arranged on both sides of the mating piece 52 at positions corresponding to the mating piece 52. This structure was similar to the structure used to fix the fixing plates 61, 61 to the rigid connecting member 3 in the above-described modified example. A rectangular parallelepiped object to be measured 204 was placed between the fixing plates 61, 61 at the other end of the pair of fixing plates 61, 61, and fixed to the fixing plates 61, 61 with bolts. The rigid connecting member 3 and the object to be measured 204 were provided at two locations in the width direction perpendicular to the direction in which the pressure plate 2 was pulled, and were installed symmetrically across the lock bolt 202 in the width direction of the pressure plate 2.

[0051] A tensile test was then performed by simultaneously applying a tensile force to the measurement objects 204 / 204 using hydraulic jack 205 in a direction away from the pressure plate 2, and the displacement of the left and right measurement objects 204 / 204 in the tensile direction was measured using displacement gauges 206a and 206b that came into contact with the measurement objects 204 / 204, respectively, and the displacement of the pressure plate 2 in the tensile direction was measured using displacement gauges 207a and 207b that came into contact with the side edge of the pressure plate 2 in the tensile direction and were arranged outside the displacement gauges 206a and 206b, respectively. The distance from the connecting side edge of the rigid connecting member 3 of the pressure plate 2 to the end edge of the measurement object 204 in the tensile direction was 837 mm.

[0052] The average value of the displacement measured by displacement gauges 206a and 206b is shown by a solid line in Fig. 10, the average value of the displacement measured by displacement gauges 207a and 207b is shown by a dotted line in Fig. 10, and the value obtained by subtracting the average value of the displacement measured by displacement gauges 207a and 207b from the average value of the displacement measured by displacement gauges 206a and 206b is shown by a dashed-dotted line in Fig. 10. The dashed-dotted line represents a displacement that approximates the displacement of the connecting portion between one pressure plate 2 and another pressure plate 2 in the slope stabilization structure of the embodiment.

[0053] At the maximum tensile strength of 81 kN, the displacement of the dashed-dotted line is larger than the displacement of the dotted line, and it can be seen that the displacement approximating the displacement of the connecting portion between one pressure plate 2 and another pressure plate 2 is larger than the displacement of the pressure plate 2. Furthermore, at the maximum tensile strength of 81 kN, no yield behavior is observed in either the portion approximating the connecting portion between one pressure plate 2 and another pressure plate 2 or the pressure plate 2, and allowing for a safety factor of 1.3, an allowable tensile load of 62 kN is achieved, which, for example, is able to clear the design allowable tensile load of 50 kN. [Industrial Applicability]

[0054] The present invention can be used in a slope stabilization structure in which a pressure plate is attached to the portion of a columnar ground reinforcement material that is driven into the ground and protrudes from the slope. [Explanation of symbols]

[0055] 1...Ground reinforcement material 11...Steel pipe 12...Reinforcing bar 13...Reinforcing sleeve 14...Injection material 15...Lower bearing plate 16...Upper bearing plate 17...Nut 18...Protective cap 2...Pressure plate 21...Standing wall 22...Mesh 23...Penetration part 3...Rigid connecting member 30...Connector 31...Standing wall 32...Mesh 4...Filling material 41...Assembly 51, 52...Interlocking piece 511...Internal thread hole 521...Through-hole 61, 62...Fixing plate 611, 621...Bolt insertion hole 71...Fixing bolt 72...Washer 73...Nut 81...Fixing bolt 82, 84...Washer 83...Nut 100...Ground 101...Slope 201...Concrete mass 202...Rock bolt 203...Resin concrete 204... Measurement object 205... Hydraulic jack 206a, 206b, 207a, 207b... Displacement meter

Claims

1. Multiple columnar ground reinforcement materials are installed at intervals from the slope down to the ground. a pressure plate that is fitted onto a protruding portion of each of the ground reinforcements from the slope and abuts against the slope is fixed to the ground reinforcements; One end of a rigid connecting member is fixed to the first pressure plate, The other end of the rigid connecting member is fixed to a second pressure plate disposed adjacent to and spaced from the first pressure plate.

2. Multiple columnar ground reinforcement materials are installed at intervals from the slope down to the ground. a pressure plate that is fitted onto a protruding portion of each of the ground reinforcements from the slope and abuts against the slope is fixed to the ground reinforcements; a connecting body in which a plurality of rigid connecting members are fixed and connected in a longitudinal direction is provided between the first pressure receiving plate and the second pressure receiving plate arranged adjacent to the first pressure receiving plate with a space therebetween, a tip end of the rigid connecting member located on one end side of the connecting body is fixed to the first pressure-receiving plate, A slope stabilization structure, characterized in that the tip of the rigid connecting member located on the other end side of the connecting body is fixed to the first pressure plate.

3. The pressure plate and the rigid connecting member are made of a lattice material, a fixing plate is installed between first fitting pieces fitted into the mesh of the pressure plate which is the lattice material and second fitting pieces fitted into the mesh of the rigid connecting member which is the lattice material, 3. The slope stabilization structure according to claim 1, wherein the pressure plate and the rigid connecting member are fixed together by fixing the fixed plate to the first mating piece and the second mating piece.

4. a first fixing plate having a flat plate shape and a second fixing plate bent in a Z-shape are provided between the first fitting piece and the second fitting piece; the first fixing plate and the second fixing plate are fixed to the first fitting piece and to the second fitting piece, thereby fixing the pressure-receiving plate and the rigid connecting member, 4. The slope stabilization structure according to claim 3, wherein the rigid connecting member is sandwiched between the first fixed plate and the second fixed plate.

5. 3. A slope stabilization structure according to claim 1, wherein the pressure plate and the rigid connecting member are made of the same material and lattice material having the same mesh size.

6. 3. A slope stabilization structure according to claim 1 or 2, characterized in that the pressure plate is made of a lattice material made of fiber-reinforced resin, the ground reinforcement material is inserted through a penetration formed in the pressure plate made of the lattice material so that the head of the ground reinforcement material protrudes from the pressure plate, and a filler material is filled in the mesh of the lattice around the penetration of the pressure plate.

7. 3. A slope stabilization structure according to claim 1, wherein the displacement in the connecting direction between the rigid connecting member and the pressure plate in response to the same tensile force and the displacement in the connecting direction between the rigid connecting member and the pressure plate in response to the same compressive force are greater at the connecting portion between the first pressure plate and the second pressure plate than at the pressure plate.

Images