Slope reinforcement structure and construction method

Abstract

To provide a slope reinforcement structure and a construction method thereof that can appropriately perform slope reinforcement within a limited construction range.SOLUTION: A slope reinforcement structure 1 for reinforcing the ground having a slope has a first drilled part 11 that is drilled from the slope, and a first reinforcing material 12 that is inserted into the first drilled part 11, and has a first reinforcing body 10 in which the first drilled part 11 is filled with a filler F and the first reinforcing material 12 is fixed, and a second drilled part 21 that is drilled from a location other than the slope and is connected to the first drilled part 11, and a second reinforcing material 22 that is inserted into the second drilled part 21. A second reinforcing body 20 in which the second drilled part 21 is filled with the filler F and the second reinforcing material 22 is fixed and a connection portion 30 where the first reinforcing material 12 and the second reinforcing material 22 are connected are provided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a slope reinforcement structure and construction method for reinforcing slopes, masonry block retaining walls, etc. that are at risk of collapse due to the effects of earthquakes or rainfall. [Background technology]

[0002] Ground reinforcement structures near slopes involve pouring reinforcement materials into the slope at regular intervals to generate resistance to sliding soil masses and earth pressure. Generally, reinforcement structures in areas with low bearing capacity, such as embankments and cut slopes in residential areas, use long reinforcement materials, increase the number of reinforcement materials installed, or increase the diameter of drilled holes into which grout is filled to ensure resistance to pull-out due to friction. Summary of the Invention [Problem to be solved by the invention]

[0003] However, when a building such as a residential lot is located near a slope, installing a long reinforcement material from the slope side may require the reinforcement material 80 to extend beyond the property line, as shown in Figure 1, in order to ensure the required pull-out resistance. In such cases, in addition to the usual construction permit, another construction permit is required, which creates a problem of time-consuming procedures before construction. In other words, in order to simplify the pre-construction procedures, it is preferable to achieve construction that does not extend beyond the property line.

[0004] On the other hand, when attempting to reinforce a slope within an area that does not cross the site boundary, the work must be carried out within a limited construction area, making it difficult to use large construction machinery and making it difficult to reinforce the slope.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a slope reinforcement structure and construction method that can appropriately reinforce slopes within a limited construction area. [Means for solving the problem]

[0006] One aspect of the present invention that solves the above-mentioned problem is a slope reinforcement structure that reinforces ground having a slope, characterized by comprising: a first reinforcement body having a first drilled portion drilled from the slope and a first reinforcing material inserted into the first drilled portion, and in which a filler material is filled into the first drilled portion to fix the first reinforcing material; a second reinforcement body having a second drilled portion drilled from a location other than the slope and connected to the first drilled portion and a second reinforcing material inserted into the second drilled portion, and in which a filler material is filled into the second drilled portion to fix the second reinforcing material; and a connection portion that connects the first reinforcing material and the second reinforcing material.

[0007] A connector to which the second reinforcing material is connected may be attached to the first reinforcing material, and the connection portion may be formed by connecting the connector and the second reinforcing material.

[0008] The reinforcing member may further include a bag body that covers a portion of the first reinforcing member, and the filler material may be filled in the bag body.

[0009] The second drilling section may be drilled from the ground surface.

[0010] The second hole-making portion may be formed along the extension direction of the inclined surface.

[0011] Another aspect of the present invention is a slope reinforcement method for reinforcing ground having a slope, characterized in that a first drilled hole portion drilled from the slope and a second drilled hole portion drilled from a location other than the slope are formed so that they are connected, a first reinforcing material is inserted into the first drilled hole portion and a second reinforcing material is inserted into the second drilled hole portion, respectively, to connect the first reinforcing material and the second reinforcing material, and a filler material is filled into the first drilled hole portion and the second drilled hole portion to fix the first reinforcing material and the second reinforcing material.

[0012] The first reinforcing material, to which a connecting device to which the second reinforcing material is connected, may be inserted into the first drilled hole portion, and the second reinforcing material may be connected to the connecting device when the second reinforcing material is inserted into the second drilled hole portion.

[0013] The first reinforcing material, part of which is covered with a bag body, may be inserted into the first drilled hole, and the filler material may be filled into the bag body.

[0014] The second drilling section may be drilled from the ground surface.

[0015] The second hole-making portion may be formed along the extension direction of the inclined surface. [Effects of the Invention]

[0016] According to the present invention, slope reinforcement can be performed appropriately within a limited construction area. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a vertical cross-sectional view of the ground showing a schematic configuration of a conventional slope reinforcement structure around a site boundary line. [Figure 2] FIG. 1 is a vertical cross-sectional view of the ground showing the schematic configuration of a slope reinforcement structure according to a first embodiment of the present invention in the vicinity of a site boundary line. [Figure 3] FIG. 1 is a cross-sectional view of the ground showing the schematic configuration of a slope reinforcement structure. [Figure 4] 1A and 1B are a plan view and a bottom view of a first reinforcing member illustrating a connector attached to the first reinforcing member; [Figure 5] This is an enlarged view of the area around the first drilled hole of the slope reinforcement structure. [Figure 6] 10A and 10B are diagrams illustrating examples of the shape of a first reinforcing member. [Figure 7] FIG. 2 is a diagram for explaining the slope reinforcement method according to the first embodiment. [Figure 8] FIG. 2 is a diagram for explaining the slope reinforcement method according to the first embodiment. [Figure 9] FIG. 10 is a diagram illustrating a construction method for inserting a reinforcing bar cage into the second drilled hole section. [Figure 10] 10A and 10B are diagrams illustrating an example of the head treatment of the first reinforcing material. [Figure 11]10A and 10B are diagrams illustrating another example of the head treatment of the first reinforcing material. [Figure 12] FIG. 10 is a vertical cross-sectional view of the ground showing the schematic configuration of a slope reinforcement structure according to a second embodiment of the present invention in the vicinity of a site boundary line. [Figure 13] 1A and 1B are a plan view and a bottom view of a first reinforcing member to illustrate a bag body attached to the first reinforcing member; [Figure 14] FIG. 10 is a diagram for explaining a slope reinforcement method according to a second embodiment. [Figure 15] FIG. 10 is a diagram for explaining a slope reinforcement method according to a second embodiment. [Figure 16] 10A and 10B are diagrams for explaining an example of a method for filling a filler material into a bag body. [Figure 17] FIG. 10 is a vertical cross-sectional view of the ground illustrating another example of the arrangement of the second reinforcing body. [Figure 18] FIG. 10 is a cross-sectional view of the ground illustrating another example of the arrangement of the second reinforcing body. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0019] Furthermore, in this specification and drawings, the "Y direction" refers to the extension direction of the slope (the extension direction of the ridge line between the ground surface and the slope), the "Z direction" refers to the vertical direction, and the "X direction" refers to the direction perpendicular to each of the Y direction and the Z direction.

[0020] First Embodiment Fig. 2 is a vertical cross-sectional view of the ground showing the schematic configuration of the slope reinforcement structure 1 around the site boundary, as seen from the direction of the ridge between the ground surface and the slope. Fig. 3 is a horizontal cross-sectional view of the ground showing the schematic configuration of the slope reinforcement structure 1.

[0021] (Outline of slope reinforcement structure) As shown in FIGS. 2 and 3, the slope reinforcement structure 1 includes a first reinforcement body 10 extending from the slope into the ground, and a second reinforcement body 20 extending from the ground surface into the ground.

[0022] The first reinforcing body 10 has a first drilled portion 11 formed on the slope of the ground and a first reinforcing material 12 inserted into the first drilled portion 11, and the first reinforcing material 12 is fixed in place by filling the first drilled portion 11 with filler material F (grout material).

[0023] The first hole-boring section 11 is a hole bored from a slope, has an opening on the slope, and extends from the opening toward the ground. The tip (ground-side end) of the first hole-boring section 11 is located within a range that does not cross the site boundary line, and is connected to the second hole-boring section 21 of the second reinforcing body 20, which will be described later. Note that the drilling means is not particularly limited, and known means can be applied.

[0024] The first reinforcing material 12 is a long rod-like or tubular member that is fixed to the filler F and can contribute to reinforcing the ground by its pull-out resistance, and for example, a long steel member is used. More specifically, for example, a hollow steel bar such as a rock bolt, a circular steel pipe, a deformed steel bar (deformed reinforcing bar), etc. are used as the first reinforcing material 12.

[0025] 2, a plurality of first reinforcing members 10 are provided at intervals along the vertical direction (Z direction), but the installation locations and installation intervals of the first reinforcing members 10 in the vertical direction are changed as appropriate depending on the required reinforcement range of the slope, etc. For example, depending on the size of the reinforcement range, the first reinforcing member 10 may be installed in only one location in the vertical direction.

[0026] The second reinforcing body 20 has a second drilled portion 21 formed on the surface of the ground and a second reinforcing material 22 inserted into the second drilled portion 21, and the second reinforcing material 22 is fixed by filling the second drilled portion 21 with filler material F (grout material).

[0027] The second hole drilling section 21 is a hole drilled from the ground surface, extending in the vertical direction (Z direction), with an opening at the ground surface and extending from that opening towards the interior of the ground. The depth of the second hole drilling section 21 is changed as appropriate depending on the number of first reinforcing bodies 10 installed in the vertical direction. The second hole drilling section 21 is formed on the slope side of the site boundary line, and the second hole drilling section 21 is connected to the above-mentioned first hole drilling section 11. The drilling means is not particularly limited, and any known means can be applied.

[0028] The second reinforcing material 22 is a long rod-like or tubular member that is fixed to the filling material F and can contribute to reinforcing the ground by its pull-out resistance, and for example, a long steel member is used. More specifically, for example, a hollow steel bar such as a rock bolt, a circular steel pipe, a deformed steel bar (deformed reinforcing bar), etc. are used as the second reinforcing material 22.

[0029] As shown in Fig. 3, a plurality of second reinforcing members 20 are provided at intervals in the extension direction of the slope (Y direction), and a plurality of first reinforcing members 10 are also provided at intervals in the extension direction of the slope so as to correspond to the installation locations of the second reinforcing members 20. The installation locations and installation intervals of the first reinforcing members 10 and the second reinforcing members 20 in the extension direction of the slope can be changed as appropriate depending on the required reinforcement range of the slope. For example, depending on the size of the reinforcement range, the first reinforcing members 10 and the second reinforcing members 20 may be installed in only one location in the extension direction of the slope.

[0030] In the slope reinforcement structure 1, the first reinforcement member 12 and the second reinforcement member 22 are connected at a connection portion 30. The connection portion 30 will be described below.

[0031] Fig. 4 is a plan view of the first reinforcing member 12 and a view of the plan view from below to explain the connector attached to the first reinforcing member 12. Fig. 5 is an enlarged view of the periphery of the first drilled hole portion 11 of the slope reinforcement structure 1.

[0032] As shown in Fig. 4, an eyebolt 13 is screwed and attached to the tip end (ground side end) of the first reinforcing member 12 as a connector for connecting the second reinforcing member 22. Then, as shown in Fig. 5, at the connection part 30, the second reinforcing member 22 is inserted inside the loop of the eyebolt 13, thereby connecting the first reinforcing member 12 and the second reinforcing member 22.

[0033] Here, in this specification, "the first reinforcement material and the second reinforcement material are connected" means that when an attempt is made to pull out either the first reinforcement material 12 or the second reinforcement material 22 inserted in the drilled hole portion from the drilled hole portion, the other reinforcement material also moves in the pulling-out direction along with the first reinforcement material.

[0034] In more detail, when attempting to pull out the first reinforcing material 12, if the second reinforcing material 22 moves together with the first reinforcing material 12 in the direction of pulling out the first reinforcing material 12, the first reinforcing material 12 and the second reinforcing material 22 are in a connected state.

[0035] Furthermore, for example, even if the second reinforcing member 22 does not move in the direction of pulling out the first reinforcing member 12 when an attempt is made to pull out the first reinforcing member 12, if the first reinforcing member 12 moves together with the second reinforcing member 22 in the direction of pulling out the second reinforcing member 22 when an attempt is made to pull out the second reinforcing member 22, then the first reinforcing member 12 and the second reinforcing member 22 are in a connected state.

[0036] On the other hand, when an attempt is made to pull out the first reinforcing material 12, if the second reinforcing material 22 does not move in tandem with the first reinforcing material 12 and only the first reinforcing material 12 is pulled out, and when an attempt is made to pull out the second reinforcing material 22, if the first reinforcing material 12 does not move in tandem with the second reinforcing material 22 and only the second reinforcing material 22 is pulled out, then the first reinforcing material 12 and the second reinforcing material 22 are not connected.

[0037] Explaining further with reference to Figure 5, when the second reinforcing member 22 is inserted through the eyebolt 13 of the first reinforcing member 12, if an attempt is made to pull the first reinforcing member 12 toward the slope, the inner circumferential surface of the eyebolt 13 comes into contact with the second reinforcing member 22, and the second reinforcing member 22 is pulled and moved in the direction of pulling out the first reinforcing member 12. For this reason, in the example shown in Figure 5, the first reinforcing member 12 and the second reinforcing member 22 are in a connected state, and a connection portion 30 is formed.

[0038] On the other hand, although not shown, for example, in the case where a first reinforcing member 12 and a second reinforcing member 22, which do not have eyebolts 13, are in contact with each other in a cross-shaped manner, when an attempt is made to pull out the first reinforcing member 12 toward the slope, only the first reinforcing member 12 moves in the pull-out direction, and the second reinforcing member 22 does not follow. Furthermore, when an attempt is made to pull out the second reinforcing member 22 toward the ground surface, only the second reinforcing member 22 moves in the pull-out direction, and the first reinforcing member 12 does not follow. In other words, when an attempt is made to pull out either reinforcing member, only the reinforcing member being pulled out is pulled out. Therefore, when the first reinforcing member 12 and the second reinforcing member 22 are in contact with each other in a cross-shaped manner, the first reinforcing member 12 and the second reinforcing member 22 are not connected, and no connection portion 30 is formed.

[0039] The connector provided on the first reinforcing member 12 is not limited to the eyebolt 13 described above, and may be, for example, a hook 14 as shown in Fig. 7. If the second reinforcing member 22 is inserted inside the arc portion of the hook 14 so that the hook 14 is caught on the second reinforcing member 22, the first reinforcing member 12 and the second reinforcing member 22 are connected to each other, and a connection portion 30 can be formed.

[0040] The configuration of the connecting portion 30 is not limited to the configurations exemplified above, and may be any configuration that connects the first reinforcing member 12 and the second reinforcing member 22. For example, the connector for connecting one reinforcing member to another reinforcing member may be a part other than the eyebolt 13 or hook 14 described above. Also, for example, the connector may be provided on the second reinforcing member 22 instead of the first reinforcing member 12. Also, for example, the connecting portion 30 may be configured by integrating the first reinforcing member 12 and the second reinforcing member 22, as in the case of joining the first reinforcing member 12 and the second reinforcing member 22 by welding or an industrial adhesive.

[0041] The above has described the schematic configuration of the slope reinforcement structure 1 according to this embodiment. Note that as the filler F that fixes the first reinforcement member 12 and the second reinforcement member 22, a known filler such as mortar or concrete can be used.

[0042] (Explanation of slope reinforcement method) Next, an example of a method for constructing the above-described slope reinforcement structure 1 will be described as a slope reinforcement method according to this embodiment.

[0043] 7 and 8 are diagrams for explaining the slope reinforcement method according to the first embodiment. Fig. 7 shows the process from drilling holes in the ground to inserting the reinforcing materials 12 and 22, and Fig. 8 shows the process from filling the holes 11 and 21 with the filler material F to attaching the reaction plate 40.

[0044] First, as shown in Figure 7(a), a first drilling section 11 is formed on the slope side of the ground, and a second drilling section 21 is formed on the ground surface side. At this time, either the first drilling section 11 or the second drilling section 21 may be formed first, but the first drilling section 11 and the second drilling section 21 are formed so that they are connected to each other.

[0045] Next, as shown in Figure 7(b), the first reinforcement material 12 is inserted into the first drilled hole portion 11. At this time, the first reinforcement material 12 is inserted until the eyebolt 13 attached to the tip end (the end on the ground side) of the first reinforcement material 12 reaches the second drilled hole portion 21. In addition, the first reinforcement material 12 is positioned so that the annular opening portion of the eyebolt 13 faces upward.

[0046] 7(c), the second reinforcing member 22 is inserted from the upper end of the second drilled hole portion 21. At this time, the second reinforcing member 22 is inserted so as to pass inside the loop of the eyebolt 13 at the tip of the first reinforcing member 12. This connects the first reinforcing member 12 and the second reinforcing member 22, forming a connection portion 30.

[0047] Next, as shown in Figure 8(a), in order to fill each drilled hole section 11, 21 with filler material F, the opening on the slope side of the first drilled hole section 11 is blocked, and filler material F, such as mortar, is injected from the upper end of the second drilled hole section 21.

[0048] As a result, filler material F is filled into the bottom of second hole drilling section 21, and when the liquid level of filler material F rises to the connection height of first hole drilling section 11 and second hole drilling section 21, filler material F flows from second hole drilling section 21 into first hole drilling section 11. Then, when first hole drilling section 11, which is located vertically below, is filled with filler material F, the liquid level of filler material F in second hole drilling section 21 rises further, and filler material F also flows into first hole drilling section 11, which is located vertically above.

[0049] By this method of filling the filler F, the filler F is filled into the first drilled hole section 11 and the second drilled hole section 21, as shown in Figure 8(b). Then, the first reinforcing material 12 is fixed to the filler F in the first drilled hole section 11 to form the first reinforcing body 10, and the second reinforcing material 22 is fixed to the filler F in the second drilled hole section 21 to form the second reinforcing body 20.

[0050] Finally, as shown in Figure 8(c), similar to a known construction method, a washer is attached as a reaction plate 40 (pressure plate) to the head (end on the slope side) of the first reinforcing member 12. In this way, the slope reinforcement structure 1 is constructed.

[0051] In this slope reinforcement structure 1, in addition to a first reinforcement body 10 to which a first reinforcement member 12 inserted from the slope side of the ground is fixed, a second reinforcement body 20 to which a second reinforcement member 22 inserted from the ground surface side is fixed is provided. Also, a connection part 30 is provided where the first reinforcement member 12 and the second reinforcement member 22 are connected.

[0052] According to the slope reinforcement structure 1 having such a configuration, the first reinforcement member 12 and the second reinforcement member 22 are fixed in a connected state, which increases the pull-out resistance of the entire structure and improves the reinforcement force of the slope compared to previous reinforcement structures that only have the first reinforcement member.

[0053] Therefore, it is possible to appropriately reinforce slopes even if the overall length of the first reinforcement member 12 is shortened so that it does not cross the site boundary line. Furthermore, with the improvement in ground reinforcing capacity, it is possible to make the drilling diameter smaller than in previous structures, and slope reinforcement can be performed without using large construction machinery, even in a limited construction area on the slope side of the site boundary line.

[0054] The above-described slope reinforcement structure 1 can also be applied to ground where the construction area is not restricted by site boundaries. Even in this case, the provision of the second reinforcement body 20 can increase the ground reinforcement power compared to conventional reinforcement structures.

[0055] 7 and 8 have described an example of a construction method for the slope reinforcement structure 1, but it is also possible that the inner wall of the second hole drilling section 21 will not stand on its own and may collapse easily depending on the geology of the ground. In such cases, a reinforcing bar cage 41 may be inserted into the second hole drilling section 21, as shown in FIG. 9. The reinforcing bar cage 41 has substantially the same shape as the second hole drilling section 21 so as to be in contact with the inner peripheral surface of the second hole drilling section 21, and has a vertical length substantially the same as the depth of the second hole drilling section 21. The construction method when using the reinforcing bar cage 41 is as follows.

[0056] First, the first drilled hole section 11 and the second drilled hole section 21 are formed as shown in FIG. 7(a) above. Then, as shown in FIG. 9(a), a reinforcing bar cage 41 is inserted from the top end of the second drilled hole section 21. Next, as shown in FIG. 9(b), a first reinforcing member 12 is inserted into the first drilled hole section 11. The reinforcing bar cage 41 has an opening (not shown) formed in advance so that the first reinforcing member 12 can be inserted therethrough. The first reinforcing member 12 is inserted so that the eyebolt 13 passes through the opening of the reinforcing bar cage 41 and reaches the second drilled hole section 21. Next, as shown in FIG. 9(c), a second reinforcing member 22 is inserted into the second drilled hole section 21 so that it passes through the loop of the eyebolt 13 located inside the reinforcing bar cage 41.

[0057] The subsequent steps are the same as those shown in Figs. 8(a) to 8(c), and the first drilled hole portion 11 and the second drilled hole portion 21 are filled with the filler material F to construct the slope reinforcement structure 1.

[0058] According to this construction method using the reinforcing bar cage 41, the slope reinforcement structure 1 can be constructed without collapsing the inner wall of the second drilled hole section 21. Furthermore, according to this slope reinforcement structure 1, the reinforcing bar cage 41 as well as the second reinforcing material 22 are fixed to the filling material, further improving the reinforcing power of the ground.

[0059] In the above-described construction method using the reinforcing bar cage 41, the second reinforcing member 22 is used as a component separate from the reinforcing bar cage 41, but the reinforcing bar cage 41 itself may be used as the second reinforcing member 22. In this case, for example, the hook 14 shown in Fig. 6 is attached to the tip of the first reinforcing member 12, and the hook 14 is hooked onto the reinforcing bar of the reinforcing bar cage 41, thereby connecting the first reinforcing member 12 and the reinforcing bar cage 41 (second reinforcing member 22).

[0060] Furthermore, the member for maintaining the self-supporting inner wall of second hole drilling section 21 is not limited to reinforcing bar cage 41 shown in Figure 9, but may be, for example, a spring material. Also, it is not limited to steel materials such as reinforcing bar cage 41 or spring material, but may be, for example, a mesh-like tubular member made of resin, a PVC pipe, or a void pipe. In other words, the member for maintaining the self-supporting inner wall of second hole drilling section 21 may be a tubular member having a shape that allows first reinforcing member 12 and second reinforcing member 22 to be connected inside the tubular member, or a member having a shape that allows the tubular member itself to be connected to first reinforcing member 12.

[0061] In the construction method illustrated in Fig. 8(c), a reaction plate 40 is attached to the head of the first reinforcing member 12 as head treatment of the first reinforcing member 12, but for slopes where stone walls or concrete retaining walls are to be constructed for aesthetic reasons, it is preferable to use head treatment as shown in Fig. 10, which will be described below. Fig. 10 explains an example of construction for constructing the above-mentioned slope reinforcement structure 1 on an existing stone wall.

[0062] First, as shown in Fig. 10(a), a cutting tool such as a core drill is used to bore out the center of some of the building stones 41a that make up the stone wall (core sampling), forming a through-hole 42 through which the first reinforcing member 12 can be inserted. A rod-shaped sample 43 (core sample) bored out of the building stone 41a is cut off to shorten its overall length so that it can be used as a blocking member to cover the through-hole 42, which will be described later.

[0063] 10(b), the first reinforcing material 12 is inserted into the through-hole 42 of the building stone 41a and installed on the slope of the ground. At this time, the first reinforcing material 12 is inserted so that the head of the first reinforcing material 12 does not protrude outside (toward the exterior) of the building stone 41a.

[0064] Then, a filler F such as mortar is injected from the outer end (exterior end) of the through-hole 42 formed in the building stone 41a. The injected filler F fills the through-hole 42 and also fills the gap between the building stone 41a and the surrounding building stones 41b adjacent to it on the back side of the building stone 41a. This fixes the first reinforcing member 12 and the building stones 41a, 41b.

[0065] Finally, as shown in Figure 10(d), a removed material 43 that has been hollowed out from the stone 41a and cut into short pieces is fitted into the outer end (exterior end) of the through-hole 42 to close the through-hole 42. This completes the head treatment of the first reinforcing material 12 for the existing stone wall.

[0066] According to the construction method (head treatment of the first reinforcing material 12) illustrated in Figure 10 above, the head of the first reinforcing material 12 fits within the through hole 42 of the building stone 41a, so the excess head length of the first reinforcing material 12 is not exposed to the exterior of the stone wall, and the surrounding landscape can be maintained.

[0067] In particular, as shown in Figure 10(d), when the through-hole 42 is blocked using a piece of extracted material 43 bored out of the building stone 41a, the extracted material 43 and the building stone 41a are made of the same material composition, so there is little sense of incongruity in the appearance of the extracted material 43 blocking the through-hole 42 and the surrounding building stone 41a. In other words, by using the extracted material 43 bored out of the building stone 41a when blocking the through-hole 42, the function of maintaining the surrounding landscape can be improved.

[0068] Furthermore, when forming the through-hole 42 in the stone 41a, for example, a core drill with different bit diameters may be used to form a long diameter portion 42a and a small diameter portion 42b as the through-hole, as shown in Fig. 11. By forming the long diameter portion 42a and the small diameter portion 42b in this way, a step is formed at the boundary between the long diameter portion 42a and the small diameter portion 42b.

[0069] When a step is formed inside the through-hole, a washer 44 having an outer diameter larger than that of the small diameter portion 42b can be placed in the step portion, and the head of the first reinforcing member 12 can be fixed to the step portion with a nut 45. This makes it possible to make the fixing structure between the stone 41a and the first reinforcing member 12 a stronger structure.

[0070] 10 and 11 described above show an example of construction on an existing stone wall, but similar construction can also be performed on other existing retaining walls such as concrete retaining walls.

[0071] Second Embodiment As mentioned above, the filler F is injected into the first drilled hole portion 11, but depending on the geology of the ground, there is a concern that the filler F flowing into the first drilled hole portion 11 may escape, making it impossible to fill the desired area in the first drilled hole portion 11 with the filler F. Therefore, in the second embodiment, a slope reinforcement structure 1 that can also solve this problem will be described.

[0072] Fig. 12 is a vertical cross-sectional view of the ground showing the schematic configuration of the slope reinforcement structure 1 according to the second embodiment around the site boundary, as seen from the direction of the ridge between the ground surface and the slope. Fig. 13 is a plan view of the first reinforcement member 12 and a view of the plan view from below, illustrating the bag body 50 attached to the first reinforcement member 12.

[0073] As shown in Figure 12, in the slope reinforcement structure 1 according to this embodiment, a portion of the entire length of the first reinforcing member 12, excluding both ends, is covered with a tubular bag body 50. This bag body 50 is made of fiber yarn such as polyethylene fiber. The entire length of the bag body 50 is set appropriately depending on the entire length of the first hole drilling section 11, the entire length of the first reinforcing member 12, and the desired filling area of ​​the filler material in the first hole drilling section 11.

[0074] As shown in Fig. 13, both ends of the bag body 50 are fastened to the first reinforcing material 12 by fasteners 51 such as cable ties. The first reinforcing material 12 is a hollow steel bar (for example, a rock bolt), and as shown in Fig. 13(a), a filler discharge hole 15 is formed in the portion of the first reinforcing material 12 covered by the bag body 50, penetrating from the outer peripheral surface to the inner peripheral surface of the first reinforcing material 12.

[0075] The slope reinforcement structure 1 according to the second embodiment differs from the slope reinforcement structure 1 according to the first embodiment in the above configuration. Next, a construction method for the slope reinforcement structure 1 according to the second embodiment will be described.

[0076] Figures 14 and 15 are diagrams for explaining the slope reinforcement method. Figure 14 shows the process from drilling holes in the ground to inserting the reinforcing materials 12 and 22, and Figure 15 shows the process from filling the holes 11 and 21 with filler material F to attaching the reaction plate 40.

[0077] First, as shown in Figure 14(a), a first hole drilling section 11 and a second hole drilling section 21 are formed in the ground in the same manner as in the process shown in Figure 7(a) above. Next, as shown in Figure 14(b), a bag body 50 is attached and a first reinforcing member 12 is inserted into the first hole drilling section 11. Then, as shown in Figure 14(c), a second reinforcing member 22 is inserted into the second hole drilling section 21 so as to pass through the loop of an eyebolt 13 attached to the tip of the first reinforcing member 12.

[0078] Next, as shown in Figure 15(a), filler material F is injected from the head (the end on the slope side) of the first reinforcing material 12. The injected filler material F passes through the inside of the hollow first reinforcing material 12 and flows into the bag body device 50 through the discharge hole 15 (Figure 13). Then, after the bag body device 50 is filled with filler material F, the injection of filler material F is stopped. Thereafter, the first reinforcing material 12 is fixed to the filler material F in the bag body device 50, and the first reinforcing body 10 is formed.

[0079] 15(b), the filler F is filled into the second drilled hole 21, and the second reinforcing material 22 is fixed to the filler F, thereby forming the second reinforcing body 20.

[0080] Finally, as shown in FIG. 15(c), a washer is attached as a reaction plate 40 (pressure plate) to the head (end on the slope side) of the first reinforcing member 12, thereby constructing the slope reinforcement structure 1.

[0081] In the slope reinforcement structure 1 according to the second embodiment described above, the filler F is injected into the bag body 50, so when filling the first drilled hole section 11, the filler F is less susceptible to the influence of the geology and escape of the filler F can be prevented. This makes it easier to fill the desired area in the first drilled hole section 11 with the filler F.

[0082] In the example shown in Figure 15(a), a hollow steel bar was used as the first reinforcing material 12, so the filler F was injected into the inner space of the first reinforcing material 12. However, if the first reinforcing material 12 is a solid member such as a deformed steel bar, the filler F may be injected using, for example, an injection hose 52 shown in Figure 16.

[0083] More specifically, when fastening the bag body 50 to the first reinforcing material 12, the first reinforcing material 12 and the injection hose 52 are fastened together with a fastener 51 so that the tip of the injection hose 52 is positioned inside the bag body 50. Then, after inserting the first reinforcing material 12 in this state into the first drilled hole 11, the filler material is injected into the injection hose 52. As a result, the filler material is supplied from the tip of the injection hose 52 into the bag body 50, and the inside of the bag body 50 can be filled with the filler material.

[0084] After the injection of the filler material is completed, the injection hose 52 may be pulled out from the first hole drilling section 11, for example, before the filler material solidifies, or the excess portion protruding from the slope side may be cut off and left inside the first hole drilling section 11.

[0085] The slope reinforcement structure 1 according to the first and second embodiments has been described above.

[0086] In the above embodiment, the second reinforcing body 20 extending from the ground surface into the ground extends parallel to the vertical direction (Z direction), but the extension direction of the second reinforcing body 20 may be inclined relative to the vertical direction. Even in this case, the provision of the second reinforcing body 20 extending into the ground from a surface other than the slope of the ground increases the overall pull-out resistance of the slope reinforcement structure 1 compared to conventional structures.

[0087] 17 and 18, the second reinforcing body 20 may be disposed so as to extend along the extension direction of the slope (Y direction). Even in this case, the provision of the second reinforcing body 20 extending into the ground from a surface different from the slope of the ground makes it possible to increase the pull-out resistance of the slope reinforcement structure 1 as a whole.

[0088] Therefore, it is sufficient that second reinforcing body 20 is arranged so as to extend into the ground from a location other than the slope of the ground, and second hole-boring section 21 is bored from a location other than the slope of the ground. However, from the viewpoint of ease of construction, it is preferable that second hole-boring section 21 is bored from the ground surface.

[0089] Although the present invention has been described above by way of example, it is understood that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and that such modifications and alterations are also within the technical scope of the present invention.

[0090] For example, the components of the above-described embodiments can be combined in any manner, and such combinations will naturally provide the functions and advantages of each of the components in the combination, as well as other functions and advantages that will be apparent to those skilled in the art from the description herein.

[0091] Furthermore, the effects described in this specification are merely descriptive or exemplary and are not limiting. In other words, the technology according to the present disclosure may achieve other effects that are apparent to those skilled in the art from the description of this specification, in addition to or in place of the above-described effects.

[0092] Note that the following configuration examples also fall within the technical scope of the present disclosure. (1) A slope reinforcement structure that reinforces ground having a slope, a first reinforcing body having a first drilled portion drilled from the inclined surface and a first reinforcing material inserted into the first drilled portion, and wherein a filler is filled in the first drilled portion to fix the first reinforcing material; a second reinforcing body having a second drilled portion drilled from a location other than the inclined surface and connected to the first drilled portion, and a second reinforcing material inserted into the second drilled portion, and wherein a filler material is filled in the second drilled portion to fix the second reinforcing material; A slope reinforcement structure, characterized by comprising a connection portion where the first reinforcement member and the second reinforcement member are connected. (2) A connector to which the second reinforcing member is connected is attached to the first reinforcing member, The slope reinforcement structure described in (1) is characterized in that the connection portion is formed by connecting the connector and the second reinforcement material. (3) A bag body is provided to cover a part of the first reinforcing member, The slope reinforcement structure according to (1) or (2), characterized in that the filler is filled in the bag body. (4) A slope reinforcement structure according to any one of (1) to (3), characterized in that the second drilling section is drilled from the ground surface. (5) A slope reinforcement structure according to any one of (1) to (3), characterized in that the second hole-making portion is formed along the extension direction of the slope. (6) A slope reinforcement method for reinforcing ground having a slope, forming each drilling portion so that a first drilling portion drilled from the inclined surface and a second drilling portion drilled from a location other than the inclined surface are connected; a first reinforcing material is inserted into the first drilled hole portion and a second reinforcing material is inserted into the second drilled hole portion, and the first reinforcing material and the second reinforcing material are connected to each other; A slope reinforcement method, characterized in that a filler material is filled into the first drilled hole portion and the second drilled hole portion to fix the first reinforcing material and the second reinforcing material. (7) inserting the first reinforcing member, to which a connector to which the second reinforcing member is connected, into the first drilled hole; The slope reinforcement method described in (6) is characterized in that the second reinforcement material is connected to the connector when being inserted into the second drilled hole. (8) Inserting the first reinforcing member, a portion of which is covered with a bag body, into the first drilled hole; The slope reinforcement method according to (6) or (7), characterized in that the filler is filled into the bag body. (9) A slope reinforcement method according to any one of (6) to (8), characterized in that the second drilling section is drilled from the ground surface. (10) A slope reinforcement method according to any one of (6) to (8), characterized in that the second hole drilling portion is formed along the extension direction of the slope. [Industrial Applicability]

[0093] The present invention can be applied to reinforcement of ground having a slope. [Explanation of symbols]

[0094] 1. Slope reinforcement structure 10 First reinforcement body 11 First drilling section 12 First reinforcement 13 Eyebolt 14 Hook 15 Discharge hole 20 Second Reinforcement 21 Second drilling section 22 Second reinforcement 30 Connection 40 Reaction Plate 41a Stonework (with through hole) 41b Stonework (no through hole) 42 Through hole 42a Long diameter part 42b Small diameter section 43 Extracted material 44 Washer 45 Nut 50 bag accessories 51 Binding device 52 Injection hose 80 Reinforcement F Filling material

Claims

1. A slope reinforcement structure that reinforces ground having a slope, a first reinforcing body having a first drilled portion drilled from the inclined surface and a first reinforcing material inserted into the first drilled portion, and wherein a filler is filled in the first drilled portion to fix the first reinforcing material; a second reinforcing body having a second drilled portion drilled from a location other than the inclined surface and connected to the first drilled portion, and a second reinforcing material inserted into the second drilled portion, and wherein a filler material is filled in the second drilled portion to fix the second reinforcing material; A slope reinforcement structure, characterized by comprising a connection portion where the first reinforcement member and the second reinforcement member are connected.

2. A connector to which the second reinforcing member is connected is attached to the first reinforcing member, The slope reinforcement structure according to claim 1, characterized in that the connecting portion is formed by connecting the connector and the second reinforcing member.

3. a bag body that covers a portion of the first reinforcing member, 2. The slope reinforcement structure according to claim 1, wherein the filler is filled in the bag body.

4. The slope reinforcement structure according to any one of claims 1 to 3, characterized in that the second drilling section is drilled from the ground surface.

5. The slope reinforcement structure according to any one of claims 1 to 3, characterized in that the second drilling portion is formed along the extension direction of the slope.

6. A slope reinforcement method for reinforcing ground having a slope, forming each drilling portion so that a first drilling portion drilled from the inclined surface and a second drilling portion drilled from a location other than the inclined surface are connected; a first reinforcing material is inserted into the first drilled hole portion and a second reinforcing material is inserted into the second drilled hole portion, and the first reinforcing material and the second reinforcing material are connected to each other; A slope reinforcement method, characterized in that a filler material is filled into the first drilled hole portion and the second drilled hole portion to fix the first reinforcing material and the second reinforcing material.

7. inserting the first reinforcing member, to which a connector to which the second reinforcing member is connected, into the first drilled hole; 7. The slope reinforcement method according to claim 6, wherein the second reinforcement is connected to the connector when the second reinforcement is inserted into the second drilled hole.

8. inserting the first reinforcing member, a portion of which is covered with a bag body, into the first drilled hole; 7. The slope reinforcement method according to claim 6, wherein the filler is filled into the bag body.

9. The slope reinforcement method according to any one of claims 6 to 8, characterized in that the second drilling section is drilled from the ground surface.

10. The slope reinforcement method according to any one of claims 6 to 8, characterized in that the second hole drilling section is formed along the extension direction of the slope.

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