Slope reinforcing connector, slope reinforcing structure, and slope reinforcing method

Abstract

To provide a means capable of easily reinforcing the ground even when a construction range is limited.SOLUTION: A slope reinforcing connector 30 for connecting a first reinforcing member 12 inserted from a slope and a second reinforcing member 22 inserted from a place other than the slope includes a pair of engagement parts 32 arranged with a gap 34 for inserting the second reinforcing member 22, and the slope reinforcing connector 30 is rotated around a central axis of the first reinforcing member 12 in a state where the second reinforcing member 22 is inserted into the gap 34. A hook 35 for engaging the second reinforcing material 22 inserted into the gap 34 and an inclined guide surface 37 for moving the second reinforcing material 22 inserted into the gap 34 toward the hook are respectively formed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Slopes and masonry block retaining walls are reinforced by placing reinforcement materials at regular intervals to resist sliding soil masses and earth pressure. Generally, in places where the bearing capacity of the ground is low, such as embankments and cut slopes in residential areas, reinforcement is carried out by using long reinforcement materials, increasing the number of reinforcement materials installed, or increasing the diameter of the drilled holes into which grout is filled, in order to ensure friction resistance. Summary of the Invention [Problem to be solved by the invention]

[0003] However, in residential areas, as shown in Figure 1, when long reinforcement material 80 is installed, it may exceed the boundary line of the property, which poses the problem of time-consuming procedures before construction, such as the need for additional construction permits. Also, since construction is expected to be carried out within a limited (site) area, there is also the problem that it is difficult to use large construction machinery.

[0004] The present invention aims to provide a slope reinforcement connector, a slope reinforcement structure, and a slope reinforcement method that can easily reinforce the ground, especially on slopes or stone retaining walls where the bearing capacity of the natural ground is low, even when the construction area is limited. [Means for solving the problem]

[0005] According to the present invention, which solves the above-mentioned problems, there is provided a slope reinforcement connector which connects a first reinforcing member inserted from a slope and a second reinforcing member inserted from a position other than the slope, and which has a pair of engaging portions arranged with a gap for inserting the second reinforcing member, and the pair of engaging portions are respectively formed with a hook which engages the second reinforcing member inserted into the gap by rotating the slope reinforcement connector around the central axis of the first reinforcing member with the second reinforcing member inserted into the gap, and an inclined guide surface which moves the second reinforcing member inserted into the gap toward the hook, and the hook does not hinder the insertion of the second reinforcing member into the gap in a state before rotating the slope reinforcement connector around the central axis of the first reinforcing member. and after the slope reinforcement connector is rotated around the central axis of the first reinforcement, the guide surface is positioned so as not to hinder the insertion of the second reinforcement into the gap, and after the slope reinforcement connector is rotated around the central axis of the first reinforcement, the guide surface is positioned so as not to hinder the insertion of the second reinforcement into the gap, and after the slope reinforcement connector is rotated around the central axis of the first reinforcement, the guide surface is positioned so as to move the second reinforcement inserted into the gap towards the hook.

[0006] For example, the hooks formed on each of a pair of engaging portions are bent in opposite directions when they face each other across the gap, and the guide surfaces formed on each of a pair of engaging portions are inclined in opposite directions when they face each other across the gap.

[0007] The present invention also provides a slope reinforcement structure for reinforcing a sloped ground, in which a first reinforcement member inserted from the slope and a second reinforcement member inserted from a location other than the slope of the ground are connected using the above-mentioned slope reinforcement connector, and the first reinforcement member and the second reinforcement member are fixed to the ground with a filler. The second bore portion may be bored from the ground surface.

[0008] The present invention also provides a slope reinforcement method for reinforcing a sloped ground, which comprises excavating a first drilled hole from the slope and a second drilled hole from a location other than the slope of the ground so as to connect the first drilled hole and the second drilled hole, connecting a first reinforcing member inserted in the first drilled hole and a second reinforcing member inserted in the second drilled hole using the slope reinforcement connector, and filling the first drilled hole and the second drilled hole with a filler material to fix the first reinforcing member and the second reinforcing member to the ground. The second drilled hole may be drilled from the ground surface. [Effects of the Invention]

[0009] According to the present invention, it is possible to easily reinforce the ground even when the construction area is limited, particularly for slopes or stone retaining walls where the bearing capacity of the natural ground is low. [Brief explanation of the drawings]

[0010] [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 an 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] 1 is an oblique view of a slope reinforcement connector according to an embodiment of the present invention attached to a first reinforcing member, viewed from the tip side. FIG. [Figure 5] FIG. 1 is a side view of a slope reinforcement connector according to an embodiment of the present invention in a state before rotation (before the second reinforcement member is held), and in the figure, the second reinforcement member (before being held) inserted into the gap between a pair of engaging portions is shown by a solid line. [Figure 6] FIG. 1 is a plan view of a slope reinforcement connector according to an embodiment of the present invention in a state before rotation (before the second reinforcement member is held), and in the figure, the second reinforcement member (before being held) inserted into the gap between a pair of engaging portions is shown by a dotted line. [Figure 7]FIG. 10 is an oblique view, seen from the tip side, of a slope reinforcement connector according to an embodiment of the present invention, showing a state in which a second reinforcing member is inserted into a gap formed between a pair of engaging portions. [Figure 8] This is a side view of a slope reinforcement connector according to an embodiment of the present invention in a state after rotation (after holding a second reinforcement material), and the second reinforcement material held in the insertion portion is shown in solid lines in the figure. [Figure 9] This is a plan view of a slope reinforcement connector according to an embodiment of the present invention in a state after rotation (after holding the second reinforcement material), and in the figure, the second reinforcement material held in the insertion portion is shown by a dotted line. [Figure 10] 1 is a diagram for explaining a slope reinforcement method according to an embodiment of the present invention, in which (a) shows the state after the first drilled hole section and the second drilled hole section have been excavated, (b) shows the state after the second reinforcement member has been inserted into the second drilled hole section, and (c) shows the state after the first reinforcement member has been inserted into the first drilled hole section and the first reinforcement member and the second reinforcement member have been connected using a slope reinforcement connector. [Figure 11] 1 is a diagram for explaining a slope reinforcement method according to an embodiment of the present invention, in which (a) shows the state in which filler material is injected from the upper end of the second drilled hole section, (b) shows the state in which filler material has been filled into the first drilled hole section and the second drilled hole section, and (c) shows the state in which a reaction plate (pressure-receiving plate) has been attached to the head (end on the slope side) of the first reinforcement material. [Figure 12] FIG. 10 is a diagram illustrating a construction method for inserting a reinforcing bar cage into the second drilled hole section. [Figure 13] 10A and 10B are diagrams for explaining an example of the head treatment of the first reinforcing material. [Figure 14] 10A and 10B are diagrams illustrating another example of the head treatment of the first reinforcing material. [Figure 15] FIG. 10 is a vertical cross-sectional view of the ground showing the schematic configuration of a slope reinforcement structure according to another embodiment of the present invention in the vicinity of a site boundary line. [Figure 16] 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 17] 10A and 10B are diagrams for explaining a slope reinforcement method according to another embodiment of the present invention. [Figure 18] 10A and 10B are diagrams for explaining a slope reinforcement method according to another embodiment of the present invention. [Figure 19] 10A and 10B are diagrams for explaining an example of a method for filling a filler material into a bag body. [Figure 20] FIG. 10 is a vertical cross-sectional view of the ground illustrating another example of the arrangement of the second reinforcing body. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] Furthermore, in this specification and drawings, the "X direction" refers to the excavation direction of the first hole-making section 11 that is excavated perpendicular to the slope (the direction of the central axes of the first reinforcing body 10 and the first reinforcing material 12). The "Y direction" refers to the direction perpendicular to the X direction in the horizontal plane (the extension direction of the ridge line between the ground surface and the slope). The "Z direction" refers to the excavation direction of the second hole-making section 21 that is excavated perpendicular to the ground surface (the direction of the central axes of the second reinforcing body 20 and the second reinforcing material 22), and is the vertical direction.

[0013] Fig. 2 is a vertical cross-sectional view of the ground showing the schematic configuration of a slope reinforcement structure 1 according to an embodiment of the present invention around a site boundary line, as seen from the extension direction (Y direction) of the ridge line 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.

[0014] (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.

[0015] 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 to the ground by filling the first drilled portion 11 with filler material F (grout material).

[0016] The first hole-boring section 11 is a hole bored from a slope, has an opening on the slope, and extends vertically from the opening toward the inside of 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 reinforcement body 20, which will be described later. Note that the drilling means is not particularly limited, and known means can be applied.

[0017] 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.

[0018] 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.

[0019] The second reinforcement body 20 has a second drilled portion 21 formed on the surface of the ground and a second reinforcement material 22 inserted into the second drilled portion 21, and the second reinforcement material 22 is fixed to the ground by filling the second drilled portion 21 with filler material F (grout material).

[0020] 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.

[0021] 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.

[0022] 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.

[0023] (Slope reinforcement connector) The first reinforcing member 12 and the second reinforcing member 22 are connected using a slope reinforcement connector 30 according to an embodiment of the present invention. The slope reinforcement connector 30 is attached to the tip of the first reinforcing member 12, and as will be described below, the first reinforcing member 12 and the second reinforcing member 22 are connected by engaging the engaging portion 32 of the slope reinforcement connector 30 attached to the tip of the first reinforcing member 12 with the second reinforcing member 22. The slope reinforcement connector 30 is appropriately fixed to the tip of the first reinforcing member 12 using means such as screwing, bolting, crimping, or welding. For example, a method can be considered in which a threaded portion is formed inside the base 31 of the slope reinforcement connector 30, and the tip of the first reinforcing member 12 is screwed into the base 31 of the slope reinforcement connector 30.

[0024] 4 to 9, the slope reinforcement connector 30 has a pair of engaging portions 32 formed to protrude from a base 31 toward the tip side (in a direction away from the tip of the first reinforcing member 12 in the X direction), and a gap 34 is provided between the pair of engaging portions 32, allowing the second reinforcing member 22 to be inserted until it abuts against the front surface 33 of the base 31. For example, as shown in FIG. 6, a parallel gap 34 is provided between one engaging portion 32 (the engaging portion 32 shown on the upper side in FIG. 6) and the other engaging portion 32 (the engaging portion 32 shown on the lower side in FIG. 6), allowing the second reinforcing member 22 to be inserted through this gap 34, and the second reinforcing member 22 can be inserted between the pair of engaging portions 32 from the tip side of the slope reinforcement connector 30 and abut against the front surface 33 of the base 31.

[0025] A hook 35 for engaging and holding the second reinforcing member 22 is formed at the tip of each of the pair of engaging portions 32, and the end of each hook 35 is bent in an arc shape so that the inner surface of the hook 35 wraps around a portion of the circumferential surface of the second reinforcing member 22. The hooks 35 formed on each of the pair of engaging portions 32 are arranged parallel to each other and facing each other across the gap 34 so as not to interfere with the insertion of the second reinforcing member 22 into the gap 34. However, the hooks 35 formed on each of the pair of engaging portions 32 are bent in opposite directions. For example, as shown in FIG. 4, the hook 35 formed on one of the engaging portions 32 (the engaging portion 32 shown on the front side in FIG. 4) is bent in an arc shape from left to right, and the hook 35 formed on the other engaging portion 32 (the engaging portion 32 shown on the back side in FIG. 4) is bent in an arc shape from right to left.

[0026] An insertion portion 36 is provided on the inside of each hook 35, through which the second reinforcing member 22 can be passed in a direction perpendicular to the gap 34 when the slope reinforcement connector 30 is rotated 90° around the central axis of the first reinforcing member 12. For example, as shown in Figure 9, when the slope reinforcement connector 30 is rotated 90° around the central axis of the first reinforcing member 12, the second reinforcing member 22 moves to the insertion portion 36 (inward of each hook 35) within the gap 34, and the second reinforcing member 22 is held in the insertion portion 36 with part of its circumferential surface wrapped around the inner surface of each hook 35.

[0027] On the base end sides of the pair of engaging portions 32 (portions where the pair of engaging portions 32 rise from the front surface 33 of the base portion 31), inclined guide surfaces 37 are formed so as to move the second reinforcing member 22 inserted into the gap 34 from a position close to the front surface 33 toward the insertion portion 36. The guide surfaces 37 formed on the pair of engaging portions 32 are arranged parallel to each other at positions facing each other across the gap 34 so as not to hinder the insertion of the second reinforcing member 22 into the gap 34, and are inclined in a direction gradually moving away from the central axis of the first reinforcing member 12 in the Y direction from a position close to the front surface 33 toward the insertion portion 36. However, the inclination directions of the guide surface 37 provided on one engaging portion 32 and the guide surface 37 provided on the other engaging portion 32 are opposite to each other. For example, as shown in Fig. 4, the guide surface 37 formed on one engaging portion 32 (the engaging portion 32 shown on the front side in Fig. 4) is inclined so as to gradually widen leftward from the central axis of the first reinforcing material 12 from a position close to the front surface 33 toward the insertion portion 36, while the guide surface 37 formed on the other engaging portion 32 (the engaging portion 32 shown on the back side in Fig. 4) is inclined so as to gradually widen rightward from the central axis of the first reinforcing material 12 from a position close to the front surface 33 toward the insertion portion 36. In this way, the inclinations of the guide surfaces 37 formed on the pair of engaging portions 32 are twisted relative to each other.

[0028] Because the slope reinforcement connector 30 configured as described above is attached to the tip of the first reinforcement member 12, when the gap 34 formed between the pair of engaging portions 32 is oriented in the vertical direction (Z direction), as shown in Figures 5 to 7, it is possible to insert the second reinforcement member 22 into the gap 34 until it abuts against the front surface 33 of the base 31. After the second reinforcement member 22 has been inserted into the gap 34 in this manner, as shown in Figures 5 and 6, when the first reinforcement member 12 (slope reinforcement connector 30) is rotated in the counterclockwise direction CW as viewed from the tip side of the first reinforcement member 12, the second reinforcement member 22 is pushed out by the guide surface 37 within the gap 34 from near the front surface 33 of the base 31 toward the tip side. When the orientation of the gap 34 formed between the pair of engaging portions 32 is rotated 90° counterclockwise CW from the vertical direction (Z direction), the second reinforcing member 22 pushed out toward the tip by the guide surface 37 is held in the insertion portion 36 in a direction perpendicular to the gap 34, as shown in Figures 8 and 9. By rotating the slope reinforcing connector 30 in this manner, the first reinforcing member 12 and the second reinforcing member 22 can be easily and reliably connected.

[0029] 2 and 3, the slope reinforcement connector 30 attached to the tip of the first reinforcement 12 is rotated 90° counterclockwise CW, whereby the second reinforcement 22 is held in the insertion part 36, and the first drilled part 11 and the second reinforcement 22 are connected by the slope reinforcement connector 30. Then, by filling with filler F (grout material), the first reinforcement 12 and the second reinforcement 22 are fixed to the ground, and the ground is reinforced by the first reinforcement 10 extending from the slope into the ground and the second reinforcement 20 extending from the ground surface into the ground.

[0030] The above has described the general configuration of the slope reinforcement structure 1 and the slope reinforcement connector 30 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.

[0031] (Explanation of slope reinforcement method) Next, an example of a method for constructing the above-mentioned slope reinforcement structure 1 will be described as a slope reinforcement method according to an embodiment of the present invention.

[0032] 10 and 11 are diagrams for explaining the slope reinforcement method according to the first embodiment. Fig. 10 shows the process from drilling holes in the ground to inserting the reinforcing materials 12 and 22, and Fig. 11 shows the process from filling the holes 11 and 21 with the filler material F to attaching the reaction plate 40.

[0033] First, as shown in Figure 10(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.

[0034] 10(b), the second reinforcing member 22 is inserted from the upper end of the second hole-drilled portion 21. The second reinforcing member 22 is inserted into the second hole-drilled portion 21.

[0035] Next, as shown in Figure 10(c), the first reinforcing member 12 is inserted from the opening of the first drilling section 11. Note that a slope reinforcement connector 30 is attached in advance to the tip of the first reinforcing member 12. Then, the gap 34 formed between the pair of engaging portions 32 is oriented vertically (Z direction), and the second reinforcing member 22 previously inserted into the second drilling section 21 is inserted into the gap 34 of the slope reinforcement connector 30, and the first reinforcing member 12 is inserted into the first drilling section 11 until the second reinforcing member 22 abuts against the front surface 33 of the base 31.

[0036] Next, the first reinforcement member 12 (slope reinforcement connector 30) is rotated 90° in a counterclockwise direction CW when viewed from the tip side of the first reinforcement member 12, so that the second reinforcement member 22 is held in the insertion portion 36 in a direction perpendicular to the gap 34, as shown in Figures 8 and 9. As a result, the first reinforcing member 12 and the second reinforcing member 22 are connected.

[0037] Next, as shown in Figure 11(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.

[0038] 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.

[0039] 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 11(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.

[0040] Finally, as shown in Figure 11(c), in the same manner as in known construction methods, 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.

[0041] 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. The first reinforcement member 12 and the second reinforcement member 22 are connected by a slope reinforcement connector 30.

[0042] 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 makes it possible to easily and reliably improve the reinforcement force of the slope compared to conventional reinforcement structures that only have the first reinforcement member.

[0043] 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.

[0044] 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.

[0045] 10 and 11 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, as shown in Fig. 12, a reinforcing bar cage 41 may be inserted into the second hole drilling section 21. 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.

[0046] First, after forming the first drilled hole section 11 and the second drilled hole section 21 as shown in FIG. 10(a), a rebar cage 41 is inserted from the top end of the second drilled hole section 21 as shown in FIG. 12(a). Next, as shown in FIG. 12(b), a second reinforcing member 22 is inserted into the second drilled hole section 21 (inside the rebar cage 41). Next, a first reinforcing member 12 with a slope reinforcement connector 30 attached to its tip is inserted into the first drilled hole section 11. The reinforcing member cage 41 is provided with an opening (not shown) through which the slope reinforcement connector 30 attached to the tip of the first reinforcing member 12 can be inserted. The first reinforcing member 12 is inserted so that the slope reinforcement connector 30 passes through the opening of the rebar cage 41 and reaches the second drilled hole section 21. Then, the second reinforcing material 22 is inserted into the gap 34 of the slope reinforcement connector 30 and rotated 90 degrees, thereby holding the second reinforcing material 22 in the insertion portion 36 of the slope reinforcement connector 30 and connecting the first reinforcing material 12 and the second reinforcing material 22.

[0047] The subsequent steps are the same as those shown in Figs. 11(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.

[0048] 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.

[0049] 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, the hook 35 of the slope reinforcement connector 30 attached to the tip of the first reinforcing member 12 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).

[0050] 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 Fig. 12, 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.

[0051] In the construction method illustrated in Fig. 11(c), a reaction plate 40 is attached to the head of the first reinforcing member 12 as head treatment for 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. 13, which will be described below. Fig. 13 explains a construction example for constructing the above-mentioned slope reinforcement structure 1 on an existing stone wall.

[0052] First, as shown in Fig. 13(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), and form 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 in part 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.

[0053] 13(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.

[0054] 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.

[0055] Finally, as shown in Figure 13(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.

[0056] According to the construction method (head treatment of the first reinforcing material 12) illustrated in Figure 13 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.

[0057] In particular, as shown in Figure 13(d), when the through-hole 42 is blocked using 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 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.

[0058] 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. 14. 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.

[0059] 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.

[0060] 13 and 14 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.

[0061] 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 following embodiment, a slope reinforcement structure 1 that can also solve this problem will be described.

[0062] Fig. 15 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 extension direction of the ridge line between the ground surface and the slope. Fig. 16 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.

[0063] 15, 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.

[0064] As shown in Fig. 16, 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. 16(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.

[0065] The slope reinforcement structure 1 according to this embodiment differs from the slope reinforcement structure 1 according to the previously described embodiment in the above configuration. Next, a construction method for the slope reinforcement structure 1 according to this embodiment will be described.

[0066] Figures 17 and 18 are diagrams for explaining the slope reinforcement method. Figure 17 shows the process from drilling holes in the ground to inserting the reinforcing materials 12 and 22, and Figure 18 shows the process from filling the holes 11 and 21 with filler material F to attaching the reaction plate 40.

[0067] First, as shown in Figure 17(a), a first drilled hole section 11 and a second drilled hole section 21 are formed in the ground in the same manner as in the process shown in Figure 7(a). Next, as shown in Figure 14(b), a second reinforcing member 22 is inserted into the second drilled hole section 21. Next, a bag body 50 is attached and the first reinforcing member 12 is inserted into the first drilled hole section 11. Then, the second reinforcing member 22 is inserted into the gap 34 of the slope reinforcement connector 30 and rotated 90°, thereby holding the second reinforcing member 22 in the insertion section 36 of the slope reinforcement connector 30 and connecting the first reinforcing member 12 and the second reinforcing member 22.

[0068] Next, as shown in Figure 18(a), the 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 inside the hollow first reinforcing material 12 and flows into the bag body device 50 through the discharge hole 18 (Figure 16). Then, after the bag body device 50 is filled with the filler material F, the injection of the 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.

[0069] 18(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.

[0070] Finally, as shown in FIG. 18(c), a washer is attached as a reaction plate 40 (pressure-receiving plate) to the head (end on the slope side) of the first reinforcing member 12, and the slope reinforcement structure 1 is constructed.

[0071] In the slope reinforcement structure 1 according to the 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.

[0072] In the example shown in Figure 18(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 19.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 20, the second reinforcing body 20 may be disposed so as to extend along the extension direction (Y direction) of the slope. 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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. [Industrial Applicability]

[0081] The present invention can be applied to reinforcement of ground having a slope. [Explanation of symbols]

[0082] 1. Slope reinforcement structure 10 First reinforcement body 11 First drilling section 12 First reinforcement 15 Discharge hole 20 Second Reinforcement 21 Second drilling section 22 Second reinforcement 30 Slope reinforcement connector 31 Base 32 Engagement part 33 Front 34 Gap 35 Hook 36 Insertion part 37 Guide surface 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 connector that connects a first reinforcement member inserted from a slope and a second reinforcement member inserted from a location other than the slope, a pair of engaging portions arranged with a gap therebetween into which the second reinforcing member is inserted; The pair of engaging portions are each formed with a hook that engages the second reinforcing member inserted into the gap by rotating the slope reinforcement connector around the central axis of the first reinforcing member with the second reinforcing member inserted into the gap, and an inclined guide surface that moves the second reinforcing member inserted into the gap toward the hook, The hook is positioned at a position that does not prevent the insertion of the second reinforcing member into the gap before the slope reinforcement connector is rotated around the central axis of the first reinforcing member, and is positioned at a position that engages the second reinforcing member inserted into the gap after the slope reinforcement connector is rotated around the central axis of the first reinforcing member, The guide surface is positioned in a position that does not hinder the insertion of the second reinforcement into the gap before the slope reinforcement connector is rotated around the central axis of the first reinforcement, and is positioned in a position that moves the second reinforcement inserted into the gap toward the hook after the slope reinforcement connector is rotated around the central axis of the first reinforcement.

2. the hooks formed on the pair of engaging portions are bent in opposite directions at positions facing each other across the gap, The slope reinforcement connector according to claim 1, wherein the guide surfaces formed on the pair of engaging portions are inclined in opposite directions at positions facing each other across the gap.

3. A slope reinforcement structure that reinforces ground having a slope, The first reinforcement member inserted from the slope and the second reinforcement member inserted from a location other than the slope of the ground are connected using the slope reinforcement connector according to claim 1 or 2, A slope reinforcement structure, wherein the first reinforcement material and the second reinforcement material are fixed to the ground by a filler material.

4. The slope reinforcement structure according to claim 3, wherein the second drilling section is drilled from the ground surface.

5. A slope reinforcement method for reinforcing ground having a slope, Excavating the first drilling section and the second drilling section so that the first drilling section drilled from the slope and the second drilling section drilled from a location other than the slope of the ground are connected; The first reinforcing member inserted in the first drilled hole portion and the second reinforcing member inserted in the second drilled hole portion are connected using the slope reinforcement connector according to claim 1 or 2, A slope reinforcement method in which a filler is filled in the first drilled hole portion and the second drilled hole portion to fix the first reinforcement material and the second reinforcement material to the ground.

6. 6. The slope reinforcement method according to claim 5, wherein the second drilling section is drilled from the ground surface.

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