Slope reinforcement jig and slope reinforcement method using the slope reinforcement jig

Abstract

The present invention provides a slope reinforcement jig for use in a slope reinforcement method that can reinforce the slope and prevent landslides and mudslides on the slope S by draining rainwater and groundwater from the slope. [Solution] The slope reinforcement jig 30 is composed of a drainage pipe member 50 having multiple drainage holes drilled along its length, a long reinforcing hollow pipe member 70 connected to the drainage pipe member 50, a cylindrical bag member 90 for holding a hardening reinforcing material (grout, cement, mortar, etc.) on the outer circumference of the reinforcing hollow pipe member 70, and connecting members 60, 60... for connecting the reinforcing hollow pipe members 70, 70 to each other and the reinforcing hollow pipe member 70 to the drainage pipe member 50.

Description

Technical Field

[0001] The present invention relates to a slope reinforcement fixture and a slope reinforcement structure for ensuring the stability of a slope, such as reinforcing a slope (a slope in a mountainous area, an artificial slope created by cutting or filling earthwork, etc.) while discharging rainwater, groundwater, etc. from the slope to prevent landslides and soil collapses on the slope.

Background Art

[0002] It is known that the safety of a slope (on the natural ground side) can be enhanced by inserting a reinforcing material such as a reinforcing bar into the natural ground and through the interaction between the natural ground and the reinforcing material (such as preventing soil collapses and collapses). On the other hand, rainwater and groundwater may penetrate the slope (on the natural ground side) and accumulate, resulting in the loss of slope stability and causing soil collapses and collapses. In the prior art, in addition to installing a reinforcing material such as a reinforcing bar in the natural ground to maintain slope stability, it was necessary to separately construct a drain pipe on the slope to efficiently discharge rainwater and groundwater. That is, in the prior art, the work of inserting and installing a reinforcing material such as a reinforcing bar on the slope and the work of installing a drain pipe on the slope were carried out as separate works.

[0003] In order to simplify such two types of slope reinforcement works, a slope stabilization method is known, such as that disclosed in Patent Document 1, in which a hollow tubular body having water collection holes drilled in its outer peripheral surface and a water-permeable drainage material wound around it is installed in a drilled hole in the slope, and then grout material is injected to fix the tip side of the hollow tubular body in the natural ground.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the slope stabilization method described in Patent Document 1 has a drawback: in order to anchor the tip end (deep end) of the hollow pipe having numerous through-holes to the ground, grout must be injected from the deep end, and therefore a separate pipe for grout injection must be installed inside the hollow pipe. In addition, in the slope stabilization method described in Patent Document 1, depending on the fluidity of the grout injected from the deep end of the ground, it may not remain at the tip end of the hollow pipe, resulting in insufficient strength being obtained.

[0006] The object of the present invention is to solve the problems of conventional slope reinforcement methods such as the slope stabilization method described in Patent Document 1 above, and to provide a slope reinforcement jig and a slope reinforcement method that reinforces slopes (artificial slopes created by cutting and filling) and ensures the stability of the slope by draining rainwater and groundwater from the slope to prevent landslides and mudslides (i.e., to simultaneously provide reinforcement and drainage functions). [Means for solving the problem]

[0007] The invention described in claim 1 is a slope reinforcement jig for reinforcing a slope and draining rainwater, groundwater, etc. from the slope to prevent landslides and mudslides, characterized in that it comprises a drainage pipe member having a plurality of drainage holes drilled along its length, a long reinforcing hollow pipe member connectable to the drainage pipe member, and a cylindrical bag member for holding a hardening reinforcing material (grout, cement, mortar, etc.) on the outer circumference of the reinforcing hollow pipe member.

[0008] The invention described in claim 2 is characterized in that, in the invention described in claim 1, the reinforcing hollow tube member is adjustable in length via a connecting member.

[0009] The invention described in claim 3 is characterized in that, in the invention described in claim 1, the drain pipe member is a polyvinyl chloride pipe with a sealed end, and the reinforcing hollow pipe member is a carbon steel pipe for piping (SGP pipe).

[0010] The invention described in claim 4 is characterized in that, in the invention described in claim 1, the cylindrical bag member is made of a woven fabric made of synthetic resin (such as polyester or polypropylene).

[0011] The invention described in claim 5 is a slope reinforcement method using a slope reinforcement jig described in any of claims 1 to 5, characterized in that it comprises the following steps a to c. a. Excavation process: Excavating a cylindrical hole in the slope that is approximately the same length as the slope reinforcement jig. b. Insertion step of inserting the slope reinforcement jig into the excavated cylindrical hole. c. Fill the cylindrical bag member of the inserted slope reinforcement jig with a fluid, curable reinforcing material and allow it to harden (reinforcing material filling and hardening process). [Effects of the Invention]

[0012] The slope reinforcement jig described in claim 1 comprises a drainage pipe member having a plurality of drainage holes drilled along its length, a long reinforcing hollow pipe member connectable to the drainage pipe member, and a cylindrical bag member for holding a hardening reinforcing material on the outer circumference of the reinforcing hollow pipe member. By filling the cylindrical bag member with a hardening reinforcing material and embedding it in the slope after it has hardened, it is possible to effectively discharge the water on the slope (excess groundwater) collected from the drainage holes of the drainage pipe member to the outside of the reinforcing hollow pipe member. In addition, simultaneously with this drainage function, the hardening reinforcing material (grout, cement, mortar, etc.) held on the outer circumference of the reinforcing hollow pipe member by the cylindrical bag member can increase the shear resistance (frictional force with the ground) at the surface of the slope, thereby effectively reinforcing the ground. In other words, the slope reinforcement jig described in claim 1 makes it possible to simultaneously provide a slope reinforcement function and a function to prevent landslides and mudslides on the slope by draining rainwater, groundwater, etc. from the slope, with an inexpensive configuration.

[0013] The slope reinforcement jig described in claim 2 is highly convenient because the length of the reinforcing hollow pipe member can be adjusted via a connecting member, allowing the length of the reinforcing hollow pipe member, which has the function of reinforcing the slope, to be changed according to the condition of the slope (distance from the surface to the water vein), etc.

[0014] The slope reinforcement jig described in claim 3 has a drainage pipe member which is a polyvinyl chloride pipe with a sealed end and has excellent workability, and the reinforcing hollow pipe member which is a carbon steel pipe for piping (SGP pipe) and has high shear strength, so it can be manufactured at low cost, has high durability and can be used for a long period of time.

[0015] The slope reinforcement jig described in claim 4 can be constructed at very low cost because the cylindrical bag member is made of a synthetic resin woven fabric, and it can reliably hold (harden) a hardening reinforcing material (grout, cement, mortar, etc.) on the outer circumference of the reinforcing hollow tube member.

[0016] According to the slope reinforcement method described in claim 5, it is possible to reinforce slopes in various conditions using inexpensive slope reinforcement jigs, and to promote the discharge of rainwater, groundwater, etc. from the slope, thereby preventing landslides and mudslides. [Brief explanation of the drawing]

[0017] [Figure 1] This is an explanatory diagram (front view) showing a slope reinforcement jig. [Figure 2] This is an explanatory diagram (vertical cross-section of the slope) showing the excavation process for slope reinforcement methods. [Figure 3] This is an explanatory diagram (vertical cross-section of the slope) showing the jig insertion process for slope reinforcement construction methods. [Figure 4] This is an explanatory diagram (vertical cross-section of the slope) showing the jig insertion process for slope reinforcement construction methods. [Figure 5] This is an explanatory diagram (vertical cross-section of the slope) showing the reinforcement material filling and hardening process for slope reinforcement construction methods. [Figure 6] This is an explanatory diagram (vertical cross-section) showing a slope reinforced by a slope reinforcement method.

Mode for Carrying Out the Invention

[0018] Hereinafter, an embodiment of a slope reinforcement jig according to the present invention and a slope reinforcement method using the slope reinforcement jig will be described in detail based on the drawings.

[0019] <Structure of the slope reinforcement jig> FIG. 1 shows a slope reinforcement jig. The slope reinforcement jig 30 includes a drain pipe member 50 having a plurality of drain holes drilled along the length direction, a long reinforcing hollow pipe member 70 connected to the drain pipe member 50, a cylindrical bag member 90 for holding a curable reinforcing material (grout, cement, mortar, etc.) on the outer periphery of the reinforcing hollow pipe member 70, and connecting members 60, 60 for connecting the reinforcing hollow pipe members 70, 70 to each other and the reinforcing hollow pipe member 70 and the drain pipe member 50.

[0020] The drain pipe member 50 is for forming a drain portion on the deep side of the slope (the side far from the surface) in the slope reinforcement method described later. The drain pipe member 50 is formed of a vinyl chloride cylindrical hollow body (so-called vinyl chloride pipe) having a predetermined diameter (outer diameter = φ40 mm) and a predetermined length (about 1,000 mm), and a large number of drain holes 40, 40... are drilled along the length direction. Also, the tip of the drain pipe member 50 is sealed so as to be substantially conical.

[0021] Further, the reinforcing hollow pipe member 70 is for forming a ground reinforcement portion at the surface of the slope S in the slope reinforcement method described later, and is formed by connecting a plurality (two) of metal cylindrical hollow bodies (carbon steel pipes for piping, so-called SGP pipes) having a predetermined diameter (outer diameter = φ40 mm) and a predetermined length (about 1,000 mm) using connecting fittings 60. The connecting fitting 60 is a metal cylindrical hollow body (SGP pipe) having a predetermined diameter (inner diameter = φ40 mm) and a predetermined length (about 150 mm). Also, the reinforcing hollow pipe member 70 is connected to the drain pipe member 50 using the connecting fitting 60, and the connecting fitting 60 is also externally fitted to the base end of the reinforcing hollow pipe member 70.

[0022] On the other hand, the cylindrical bag member 90 (packer) is for holding a curable reinforcing material around the outer circumference of the reinforcing hollow pipe member. The cylindrical bag member 90 is formed in a cylindrical shape from a woven fabric of synthetic resin (polyester, polypropylene, etc.), and is slightly longer (about 50-100 mm) than the reinforcing hollow pipe member 70, and is permeable to water. Furthermore, the cylindrical bag member 90 is formed in a cylindrical shape (outer diameter = φ140 mm) whose diameter (outer diameter = φ40 mm) is larger by a predetermined length than the diameter (outer diameter = φ40 mm) of the reinforcing hollow pipe member 70. The tip portion (the entire edge portion) is fixed (adhered) to the outer circumference of the connecting fitting 60 that connects the drain pipe member 50 and the reinforcing hollow pipe member 70. Furthermore, the rear end portion (the entire edge portion) of the cylindrical bag member 90 is embedded inside the slope S by the slope reinforcement method described later, and after a hardening reinforcing material (grout, cement, mortar, etc.) is filled inside, it is fixed (adhered) to the outer circumference of the connecting fitting 60 fitted to the rear end of the reinforcing hollow pipe member 70.

[0023] Furthermore, a so-called grout material (non-shrink mortar) can be suitably used as the hardening reinforcing material 80 to be filled inside the cylindrical bag member 90. Grout material is fluid and hardening, and is used to seal gaps such as voids and cracks in concrete. It has a working time of about 30 minutes while remaining fluid, and hardens in about 3 days to achieve practical strength. Grout materials include cement-based grout, epoxy-based grout, polyurethane-based grout, etc., and any type can be suitably used. In addition, mixing aggregate with cement-based grout is particularly preferable because it increases the compressive strength of the hardening reinforcing material 80 after hardening, allowing it to withstand higher loads, and also suppresses drying shrinkage of the hardening reinforcing material 80.

[0024] <Slope reinforcement method using slope reinforcement jigs> The following describes an example of a slope reinforcement method using the slope reinforcement jig 30. Figures 2 to 6 show the steps of the construction work to reinforce the slope S using the slope reinforcement method. The slope reinforcement method has three main steps, a to c, as follows. a. Excavation process: Excavating a cylindrical hole in the slope that is approximately the same length as the slope reinforcement jig 30. b. Insertion step of inserting the slope reinforcement jig 30 into the excavated cylindrical hole. c. A reinforcing material filling and curing process in which a fluid, curable reinforcing material 80 is filled into the cylindrical bag member 90 of the inserted slope reinforcement jig 30 and cured.

[0025] [a. Excavation Process] When reinforcing a slope S using a slope reinforcement method, first, as a preparatory step for installing the slope reinforcement jig, a long hole (jig installation hole) is formed in the slope by excavating (drilling) with an excavator (Figure 2(a)). Preferably, the jig installation hole is formed in a horizontal plane, perpendicular to the surface of the slope S, and approximately horizontal. Furthermore, in this slope reinforcement method using the slope reinforcement jig 30, it is preferable to form the hole using a double pipe consisting of a long cylindrical outer casing O with a bit at the end and a long cylindrical inner casing I with a bit at the end, which is placed inside the outer casing O. After forming a jig installation hole of a predetermined length with such a double pipe, only the inner casing I is withdrawn from the jig installation hole (Figure 1(b)).

[0026] [b. Jig insertion process] After forming the jig installation hole as described above, the slope reinforcement jig 30 is inserted and installed inside the outer casing O of the jig installation hole. At this time, it is possible to insert and install the assembled slope reinforcement jig 30, or to insert and install the slope reinforcement jig 30 while assembling it (in the following description, the method of inserting and installing the slope reinforcement jig 30 while assembling it will be described). When inserting and installing the slope reinforcement jig 30 while assembling it, first, as shown in Figure 3(a), the drainage pipe member 50 is inserted into the borehole. Then, the connecting fitting 60 is attached (externally fitted and crimped) to the rear end of the inserted drainage pipe member 50 (Figure 3(b)).

[0027] As described above, after attaching the connecting fitting 60 to the end of the drain pipe member 50, the reinforcing hollow pipe member 70 is attached to the connecting fitting 60 as shown in Figure 4(a). When attaching the reinforcing hollow pipe member 70 to the connecting fitting 60, the cylindrical bag member 90 is placed on the outside of the reinforcing hollow pipe member 70, and the tip of the cylindrical bag member 90 is fixed to the connecting fitting 60 (it is also possible to bond it with adhesive, or to sandwich it in the gap between the drain pipe member 50 and the connecting fitting 60). Then, as shown in Figure 4(b), the assembled drain pipe member 50, connecting fitting 60, reinforcing hollow pipe member 70, and cylindrical bag member 90 (i.e., the slope reinforcement jig 30) is pushed into the outer casing O of the jig installation hole. When pushing in the slope reinforcement jig 30, ensure that the pointed tip (conical portion) of the reinforcing hollow pipe member 70 is driven into the ground.

[0028] [c. Reinforcement filling and curing process] Then, as described above, while assembling the slope reinforcement jig 30, after pushing it sufficiently into the outer casing O of the jig installation hole, the outer casing O is pulled out from inside the jig installation hole as shown in Figure 5(a). After that, as shown in Figure 5(b), pressure is applied to the cylindrical bag member 80 using a compressor or grout pump, etc., to fill (inject) a hardening reinforcing material (grout, etc.) 90, thereby sufficiently expanding the cylindrical bag member 80 so that there is no gap between the wall surface of the jig installation hole and the cylindrical bag member 80. Finally, as shown in Figure 6, a donut-shaped pressure receiving plate made of synthetic resin is installed on the base end of the slope reinforcement jig 30 so as to be aligned with the surface of the slope S, thereby completing the slope reinforcement work.

[0029] <Effects of slope reinforcement jigs and slope reinforcement methods> As described above, the slope reinforcement jig 30 comprises a drainage pipe member 50 having multiple drainage holes 40, 40... drilled along its length, a long reinforcing hollow pipe member 70 connectable to the drainage pipe member 50, and a cylindrical bag member 90 for holding a hardening reinforcing material (grout, etc.) 80 around the outer circumference of the reinforcing hollow pipe member 70. By filling the cylindrical bag member 90 with the hardening reinforcing material 90 and embedding it in the slope after it has hardened, it becomes possible to effectively discharge water (excess groundwater) from the slope S collected from the drainage holes 40, 40... of the drainage pipe member 50 to the outside of the reinforcing hollow pipe member 70. In addition, simultaneously with this drainage function, the hardening reinforcing material (grout, cement, mortar, etc.) 80 held around the outer circumference of the reinforcing hollow pipe member 70 by the cylindrical bag member 90 can increase the shear resistance (frictional force with the ground) at the surface of the slope S, thereby effectively reinforcing the ground. In other words, the slope reinforcement jig 30, with its inexpensive construction, can simultaneously provide the function of reinforcing the slope S and the function of preventing landslides and mudslides on the slope S by draining rainwater, groundwater, etc. from the slope S.

[0030] Furthermore, the slope reinforcement jig 30 is highly convenient because the length of the reinforcing hollow pipe member 70 can be adjusted via connecting members 60, 60..., allowing the length of the reinforcing hollow pipe member 70, which has the function of reinforcing the slope S, to be changed according to the condition of the slope S (distance from the surface to the water vein), etc.

[0031] Furthermore, the slope reinforcement jig 30 has a drainage pipe member 50 which is a PVC pipe with a sealed end, making it easy to process, and the reinforcing hollow pipe member 70 is a carbon steel pipe for piping (SGP pipe), which has high shear strength, so it can be manufactured inexpensively, is highly durable, and can be used for a long period of time.

[0032] In addition, the slope reinforcement jig 30 can be constructed at very low cost because the cylindrical bag member 90 is made of woven fabric of synthetic resin (polypropylene, etc.), and it can reliably hold (harden) hardened reinforcing materials (grout, cement, mortar, etc.) around the outer circumference of the reinforcing hollow pipe member 70.

[0033] On the other hand, with the slope reinforcement method using the slope reinforcement jig 30, it is possible to reinforce the slope S regardless of its condition using the inexpensive slope reinforcement jig 30, and it is also possible to prevent landslides and mudslides by promoting the drainage of rainwater and groundwater from the slope S.

[0034] <Examples of modifications to slope reinforcement jigs and slope reinforcement structures> The slope reinforcement jig according to the present invention is not limited in any way to the embodiments described above, and the shape, structure, size, material, and other configurations of the drainage pipe member, connecting fittings, reinforcing hollow pipe member, hardenable reinforcing material, cylindrical bag member, pressure receiving plate, etc. can be appropriately changed as necessary without departing from the spirit of the present invention.

[0035] For example, the drain pipe member is not limited to a single pipe member as in the above embodiment, but may be a combination of multiple pipe members connected by connecting members, etc. Also, the reinforcing hollow pipe member is not limited to a combination of two pipe members connected by connecting members, etc. as in the above embodiment, but may be a single pipe member or a combination of three or more pipe members connected by connecting members, etc.

[0036] Furthermore, the diameter of the drain pipe member is not limited to an outer diameter of φ40 mm as in the above embodiment, but can be changed as needed within a range of approximately φ40 to φ50 mm. In addition, the length of the drain pipe member can also be changed as needed within a range of approximately 500 to 1,500 mm (outer diameter). On the other hand, the diameter of the reinforcing hollow pipe member is not limited to an outer diameter of φ40 mm as in the above embodiment, but can be changed as needed within a range of approximately φ40 to φ90 mm (outer diameter). In addition, the length of the reinforcing hollow pipe member can also be changed as needed within a range of approximately 1,000 to 4,000 mm. Moreover, the diameter of the connecting fitting is not limited to an inner diameter of φ40 mm as in the above embodiment, but can be changed as needed within a range of approximately φ40 to φ50 mm (inner diameter). In addition, the length of the reinforcing hollow pipe member can also be changed as needed within a range of approximately 30 to 150 mm.

[0037] Furthermore, the drain pipe member is not limited to being made of polyvinyl chloride pipe as in the above embodiment, but may also be made of metal pipe such as carbon steel pipe for piping (SGP pipe). In addition, the drain pipe member is not limited to being sealed with a substantially conical tip as in the above embodiment, but may also be sealed with a vertical surface tip, or have no tip sealed at all.

[0038] Furthermore, the slope reinforcement jig is not limited to the configuration described above, in which the base end of the drainage pipe member and the tip of the reinforcing hollow pipe member are pressed into the same connecting member, but may also be configured in which the connecting member and the drainage pipe member and / or reinforcing hollow pipe member are screwed together using a connecting member with screw threads. In addition, the slope reinforcement jig is not limited to the configuration described above, in which the base end of one reinforcing hollow pipe member and the tip of another reinforcing hollow pipe member are pressed into the same connecting member, but may also be configured in which the pipe members of the reinforcing hollow pipe members are screwed together using a connecting member with screw threads.

[0039] On the other hand, the drainage pipe member is not limited to having approximately circular drainage holes arranged in a row, as in the above embodiment, but may also be arranged with elliptical or round rectangle (a rectangle with semicircles added to both ends) drainage holes. Furthermore, the drainage pipe member is not limited to having multiple drainage holes arranged in a straight line, and the arrangement of the drainage holes can be changed according to the ground conditions and other circumstances.

[0040] Furthermore, the cylindrical bag member is not limited to being made of a synthetic resin woven fabric as in the above embodiment, but can also be changed to one made of a woven fabric made of natural fibers such as cotton or hemp. In addition, the diameter of the cylindrical bag member is not limited to an outer diameter of φ140 mm as in the above embodiment, but can be appropriately changed depending on conditions such as the diameter of the reinforcing hollow pipe member and the strength of the surrounding ground, so that the diameter when it expands into a cylindrical shape by filling with the hardening reinforcing material is approximately in the range of φ100 to φ200 mm.

[0041] On the other hand, the slope reinforcement method according to the present invention is not limited to excavating the jig installation hole horizontally, as in the above embodiment, but may also be excavated at an angle to the ground surface. Furthermore, the slope reinforcement method according to the present invention is not limited to attaching a donut-shaped pressure receiving plate made of synthetic resin to the base end of the slope reinforcement jig, as in the above embodiment, but may also be used without attaching a pressure receiving plate. In addition, when attaching a pressure receiving plate, it is also possible to use a steel pressure receiving plate or a rectangular plate-shaped pressure receiving plate, etc.

[0042] In addition, the slope reinforcement method according to the present invention is not limited to the method of excavating the jig installation hole using a double pipe consisting of an inner casing and an outer casing, as in the above embodiment, but may also be used to excavate the jig installation hole using a simple excavator and then insert and install the slope reinforcement. However, when the jig installation hole is excavated using a double pipe consisting of an inner casing and an outer casing, as in the above embodiment, there is the advantage that the slope reinforcement work becomes extremely easy. [Industrial applicability]

[0043] As described above, the slope reinforcement jig according to the present invention exhibits excellent effects and can therefore be suitably used as a component for reinforcing slopes and preventing landslides and mudslides by draining rainwater and groundwater from the slopes. Furthermore, the slope reinforcement method according to the present invention can be suitably used as a method for reinforcing slopes and preventing landslides and mudslides by draining rainwater and groundwater from the slopes. [Explanation of symbols]

[0044] 30 ··Slope reinforcement jig 30 40 drainage holes 50. Drain pipe component 50 60--connecting fittings 70 ··Reinforcement hollow pipe member 70 80...Curable reinforcement material 90. Cylindrical bag component

Claims

1. A slope reinforcement jig that reinforces the slope and drains rainwater, groundwater, etc. from the slope to prevent landslides and mudslides, A drain pipe member having multiple drain holes drilled along its length, A long, reinforcing hollow pipe member that can be connected to the drain pipe member, A slope reinforcement jig characterized by comprising a cylindrical bag member for holding a hardenable reinforcing material on the outer circumference of the reinforcing hollow tube member.

2. The slope reinforcement jig according to claim 1, characterized in that the reinforcing hollow tube member is adjustable in length via a connecting member.

3. The slope reinforcement jig according to claim 1, characterized in that the drainage pipe member is a polyvinyl chloride pipe with a sealed end, and the reinforcing hollow pipe member is a carbon steel pipe for piping (SGP pipe).

4. The slope reinforcement jig according to claim 1, characterized in that the cylindrical bag member is made of a woven fabric made of synthetic resin.

5. A method for reinforcing a slope using a slope reinforcement jig described in any one of claims 1 to 4, characterized in that it comprises the following steps a to c. a. Excavation process: Excavating a cylindrical hole in the slope that is approximately the same length as the slope reinforcement jig. b. Insertion step of inserting the slope reinforcement jig into the excavated cylindrical hole. c. Reinforcement material filling and curing process: A fluid, curable reinforcement material is filled into the cylindrical bag-shaped member of the inserted slope reinforcement jig and then cured.

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