Self-drilling rock bolt packer and watertight construction method using self-drilling rock bolt packer

Abstract

To provide a self-drilling rock bolt packer that reliably injects injection material around each self-drilling rock bolt packer device to increase bearing resistance against pull-out when reinforcing a landslide on a relatively small slope ground.SOLUTION: A self-drilling rock bolt packer 1 is used to create a water-running ground 10 and comprises a hollow rock bolt and a packer mounting part for clamping a packer 3. The rock bolt fits into the packer mounting part at its tip and has one or more blind holes in its middle for discharging grout 5. The packer mounting part fits into a tip of the rock bolt 3 at its rear end and has a through hole in its middle for discharging grout 5. The packer 3 is liquid-permeable and is mounted between the packer mounting part and a ring body so that it can be attached, and is filled with the grout 5 that is discharged from the blind holes and the through holes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a self-drilling rock bolt packer used to create a water-running ground, and a water-stopping method using the self-drilling rock bolt packer. [Background technology]

[0002] Conventionally, when reinforcing landslide-resistant slope ground, a method of constructing reinforcement materials that reliably injects injection material around each reinforcement material to increase bearing resistance against pull-out has been proposed, for example, in Patent Document 1. Also, a ground stabilization method has been proposed, for example, in Patent Document 2, which can effectively reinforce unstable ground by strengthening the ground while draining groundwater.

[0003] The ground stabilization method disclosed in Patent Document 1 involves inserting a pipe into a borehole, which is fitted with a permeable bag and a permeable opening equipped with a filter to prevent soil and sand from flowing in, and then injecting a consolidation material into the bag through an injection pipe installed inside or outside the pipe, causing the bag to expand. This fixes the pipe in the borehole, allowing groundwater to be drained to the surface through the permeable opening through the pipe, while also strengthening the ground with the tensile resistance of the pipe.

[0004] The reinforcement material and its construction method disclosed in Patent Document 2 is a reinforcement material used to construct the ground by placing an injection pipe in a hole drilled in the ground and injecting injection material into the injection pipe under pressure, with a discharge hole provided in the injection pipe. During pressurized injection, the injection material is released into the ground from the discharge hole, and as the injection material solidifies together with the soil and sand in the ground, a bulge is created, and as the injection material solidifies, the bulge in the ground and the injection pipe can be integrated into one. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-47031 [Patent Document 2] JP 2015-110892 A Summary of the Invention [Problem to be solved by the invention]

[0006] For example, in the construction of railway or road tunnels in bedrock, concerns exist regarding the risk of ground collapse due to water seeping into the drilled hole from water veins, and water pollution due to escape or outflow of injection material used to stop the water seepage. In this regard, the technology disclosed in Patent Document 1 fixes the pipe in the drilled hole by injecting a consolidating material into the bag and expanding the bag. However, because the bag is not provided at the pipe's water inlet, it is not possible to stop water seepage from cracks in the drilled hole. For this reason, there is a risk of hole wall collapse in cases where there are multiple springs, excessive water flow, or high water pressure. Furthermore, the technology disclosed in Patent Document 2 uses an injection packer to release injection material into the ground from a discharge hole, and then moves the injection packer to release the injection material into the ground from another discharge hole. Therefore, in cases of excessive water flow or high water pressure, water pollution and environmental impact (SDGs) due to escape or outflow of injection material cannot be suppressed. For these reasons, it is desirable to ensure that spring water is stopped and water pollution is controlled.

[0007] The present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a self-drilling rock bolt packer and a water-stopping method using a self-drilling rock bolt packer that can improve the water-stopping of spring water and the prevention of water pollution. [Means for solving the problem]

[0008] The self-drilling rock bolt packer of the first invention is a self-drilling rock bolt packer used for creating flowing ground, and comprises a hollow rock bolt and a packer mounting part that fits into the rock bolt and clamps a packer, the rock bolt fits into the packer mounting part at its front end and has an injection port at its rear end for injecting grout and one or more blind holes in its middle for discharging the grout, the packer mounting part fits into the front end of the rock bolt at its rear end and has through holes in its middle for discharging the grout, the packer is liquid-permeable and is mounted and clamped between the packer mounting part and a ring body, and fills the grout that is discharged from the blind holes and the through holes.

[0009] The self-drilling rock bolt packer of the second invention is characterized in that, in the first invention, there are at least two or more non-through holes spaced apart in the longitudinal direction of the rock bolt.

[0010] The self-drilling rock bolt packer of the third invention is characterized in that, in the first invention, the through hole is provided between the clamping position of the ring body and the position of the tip where the rock bolt is fitted.

[0011] The self-drilling rock bolt packer of the fourth invention is characterized in that, in any of the first to third inventions, the grout is injected through the injection port at the rear end of the rock bolt, discharged through the multiple blind holes and the through hole, and filled inside the packer.

[0012] The self-drilling rock bolt packer of the fifth invention is characterized in that, in the first invention, the packer mounting part is equipped with a jig at the tip for drilling holes or removing soil.

[0013] A waterstop method using a self-drilling rock bolt packer according to a sixth invention is a waterstop method using a self-drilling rock bolt packer used in creating flowing ground, and is characterized by having: a fitting step of clamping a rock bolt with a hollow structure and a plurality of non-through holes and a packer, and fitting a packer mounting part having through holes; an insertion step of clamping the packer so that it can be attached between the packer mounting part and a ring body, and inserting it into a drilled hole in the flowing ground; a filling step of injecting grout from the rear end of the rock bolt after the insertion step, and pressurizing and filling the inside of the rock bolt and the packer mounting part; a discharge step of discharging the grout injected under pressure in the filling step from the plurality of non-through holes and the non-through hole; and a leakage step of allowing the grout discharged in the discharge step to leak out from the surface of the packer to the outside.

[0014] The water-stopping method using a self-drilling rock bolt packer according to the seventh invention is the same as the sixth invention, but the filling step measures the amount of water flowing from the water-flowing ground, and pressurizes and fills the grout according to the measured amount of water flow.

[0015] The watertight construction method using a self-drilling rock bolt packer according to the eighth invention is characterized in that, in the sixth or seventh invention, the filling process further includes a re-injection process of measuring the pressure applied when the grout is injected and adding more pressurized filling of the grout depending on the measured pressure state.

[0016] The watertight construction method using a self-drilling rock bolt packer according to the ninth invention is characterized in that, in the sixth invention, the insertion step further includes a step of screwing a jig for drilling or removing soil onto the tip of the packer mounting part after clamping the packer so that it can be attached between the packer mounting part and the ring body. [Effects of the Invention]

[0017] According to the first invention, a self-drilling rock bolt packer includes a hollow rock bolt and a packer attachment part that fits into the rock bolt and clamps the packer. Therefore, the rock bolt fits into the packer attachment part at its tip, allowing the packer to be filled with grout. This allows for improved water leakage prevention and water pollution control.

[0018] According to the first aspect of the present invention, the packer mounting part has a rear end that fits over the front end of the rock bolt and a through-hole in the middle for discharging grout. Therefore, the packer is liquid-permeable and is attached between the packer mounting part and the ring body, filling the grout discharged from the non-through-hole and through-hole. This allows for improved water leakage prevention and water pollution control.

[0019] In particular, according to the second aspect of the present invention, at least two blind holes are provided at intervals along the length of the rock bolt. This allows the strength of the rock bolt to be maintained, the number and position of the holes to be adjusted, and grout can be injected around the rock bolt with high accuracy. This allows for improved water leakage prevention and water pollution control.

[0020] In particular, according to the third invention, the through-hole is provided between the clamping position of the ring body and the position of the tip where the rock bolt is fitted. This allows grout to be discharged into the packer from multiple directions, allowing the entire packer to expand, and enabling highly reliable injection of grout around the rock bolt. This allows injection pressure to be applied across the surface against water pressure resistance, thereby improving the prevention of inflow water and the suppression of water pollution.

[0021] In particular, according to the fourth invention, grout is injected through the injection port at the rear end of the rock bolt. This allows the grout to be discharged through multiple blind holes and through holes, filling the inside of the packer, and applying injection pressure across the surface against water pressure resistance. This minimizes the escape and outflow of grout, improving the prevention of inundation and the suppression of water pollution.

[0022] In particular, according to the fifth aspect of the present invention, the packer mounting part is provided with a jig at the tip for drilling or soil removal. Therefore, when the hole wall collapses, the self-drilling rock bolt packer can be rotated and inserted. This ensures and supports the construction of the rock bolt insertion process even in crumbling ground that is prone to flowing water, minimizing the impact on the construction period.

[0023] In particular, the sixth invention includes a fitting step in which a self-drilling rock bolt packer is used to clamp a hollow rock bolt with multiple blind holes and a packer, and then a packer mounting part with through holes is fitted to the packer. Therefore, the packer can be mounted between the packer mounting part and the ring body and inserted into a drilled hole in water-running ground. This allows grout to be injected from the rear end of the rock bolt, pressurizing and filling the inside of the rock bolt and the packer mounting part. This minimizes the escape of grout caused by water seepage, improving the prevention of spring water and the prevention of water pollution.

[0024] In particular, according to the seventh invention, the filling process measures the amount of water flowing from the flowing ground, and pressurizes and fills the grout according to the measured amount of water flow. This allows for the application of injection pressure across the entire packer against the resistance of water pressure, and allows for the grout to be filled evenly throughout the packer. This minimizes the escape of grout caused by water seepage, and improves the prevention of water inflow and the suppression of water pollution.

[0025] In particular, according to the eighth invention, the filling step includes a step of measuring the pressure applied during grout injection and adding additional grout under pressure depending on the measured pressure. This allows the grout to be filled uniformly inside the packer. This allows the appropriate amount of grout to be filled under pressure, thereby preventing spring water and improving the prevention of water pollution.

[0026] In particular, according to the ninth aspect of the present invention, the insertion step further includes a step of screwing a jig for drilling or soil removal onto the tip of the packer attachment part after clamping the packer attachment part and the ring body so that they can be attached. Therefore, when the hole wall collapses, the self-drilling rock bolt packer can be rotated and inserted. This ensures and supports the construction of the rock bolt insertion step even in crumbling ground that is prone to flowing water, and minimizes the impact on the construction period. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram showing an example of a water cutoff method using a self-drilling rock bolt packer in flowing ground according to this embodiment. [Figure 2] Figure 2 shows a rock bolt of a self-drilling rock bolt packer in this embodiment, where Figure 2(a) shows an example of a cross-sectional view of the rock bolt portion, and Figure 2(b) shows an example of a B-B cross-sectional view of the rock bolt. [Figure 3] Figure 3 shows the packer mounting portion of the self-drilling rock bolt packer in this embodiment, where Figure 3(a) is a cross-sectional view of the packer mounting portion, Figure 3(b) is an AA cross-sectional view of the packer mounting portion, and Figure 3(c) is a diagram showing an example of a top view of the packer mounting portion. [Figure 4] Figure 4 shows a water-stopping method using a self-drilling rock bolt packer in flowing ground in this embodiment, where Figure 4(a) shows an example of the insertion process after the fitting process, and Figure 4(b) shows an example of the filling process in which grout is injected from the rear end of the rock bolt and filled under pressure. [Figure 5] Figure 5 shows a water-stopping method using a self-drilling rock bolt packer in flowing ground in this embodiment, where Figure 5(a) shows an example of a discharge process in which grout is discharged from multiple non-penetrating holes and non-penetrating holes, and Figure 5(b) shows an example of a leakage process in which the discharged grout is leaked to the outside from the surface of the packer. [Figure 6] FIG. 6 shows an example of a flowchart of the entire process, including the additional injection process, in a waterstop method using a self-drilling rock bolt packer in flowing ground according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an example of a self-drilling rock bolt packer in an embodiment to which the present invention is applied will be described with reference to the drawings.

[0029] First, with reference to FIG. 1, an example of a self-drilling rock bolt packer 1 according to the present embodiment will be described.

[0030] <Self-drilling rock bolt packer 1> As shown in Fig. 1, the self-drilling rock bolt packer 1 in this embodiment is used in tunnel construction such as for railways or roads, targeting, for example, a water-flowing bedrock 10. When spring water is generated from a drilled hole 11 constructed at the boundary between a water vein (crack) in the water-flowing bedrock 10 or a rock layer, for example, the self-drilling rock bolt packer 1 is inserted into the drilled hole 11a where the spring water was generated, and then grout 5 is pressurized and filled into the packer 3 to stop the spring water from flowing.

[0031] The watertight construction method using the self-drilling rock bolt packer 1 allows grout 5 to seep out from the surface of the packer 3 of the self-drilling rock bolt packer 1 to the outside of the packer 3, forming a drilled hole 11b in which water is stopped from flowing from cracks in the water vein, boundaries, and even surrounding areas. The self-drilling rock bolt packer 1 and the watertight construction method using the self-drilling rock bolt packer 1 make it possible to stop water in a short time even if the location of a spring cannot be identified within the drilled hole 11a, for example, and also reduces the risk of grout 5 running away due to spring water outflow, thereby enabling the water to be stopped from the drilled hole 11a and water pollution to be better suppressed.

[0032] Here, an example of a self-drilling rock bolt packer 1 will be described with reference to Figures 2 and 3. First, an example of a rock bolt 2 will be described with reference to Figure 2. Figure 2(a) shows an example of a cross-sectional view of the rock bolt portion, and Figure 2(b) shows an example of a B-B cross-sectional view of the rock bolt. The rock bolt 2 is a hollow rock bolt, with one end (front end) fitted into a packer mounting portion 4 (joint sleeve) described below, and the other end (rear end) serving as an injection port 6 into which an injection material such as grout 5 is filled.

[0033] <Rock Bolt 2> The rock bolt 2 has one or more blind holes 7a in its middle for discharging grout 5. As shown in FIG. 2(b), the blind holes 7a are drilled in the surface of the rock bolt 2, for example, as shown in cross section BB. At least two of the blind holes 7a are drilled at intervals along the longitudinal direction of the rock bolt 2. The number and location of the blind holes 7a can be adjusted based on factors such as the amount of spring water flow. Alternatively, a rock bolt 2 with a predetermined number of blind holes 7a pre-drilled can be prepared and selected. This allows the grout 5 to be pressurized and filled from the injection port 6 around the rock bolt 2, ensuring reliable injection. This allows the grout 5 to be uniformly filled throughout the packer 3 with minimal unevenness.

[0034] Next, an example of the packer 3 and the packer mounting part 4 will be described with reference to Figure 3. As shown in Figure 3(a), the self-drilling rock bolt packer 1 comprises the packer 3 that is filled with grout 5 and the packer mounting part 4 that fits with the rock bolt 2 that clamps the packer 3.

[0035] <Packer 3> The packer 3 is, for example, a liquid-permeable cloth bag, and is attached to the packer mounting part 4 by a ring body 8. The packer 3 covers, for example, the entire rock bolt 2, and the inside of the packer 3 is filled with grout. This makes it difficult for the force of the spring water to flow out of the packer 3, and prevents the grout 5 from escaping into the water-flowing bedrock 10.

[0036] The packer 3 may be made of a material that has excellent strength, corrosion resistance, and chemical resistance, and may be made of known materials such as polypropylene fiber that is resistant to friction and abrasion when inserted into the drilled hole 11. The packer 3 may ensure adhesion by, for example, the knit / pile effect, which allows the grout 5 to leak out and the grout 5 to leak from the surface of the packer 3 due to pressure filling. The packer 3 may be made of a material that has excellent strength, corrosion resistance, and chemical resistance, and is resistant to friction and abrasion, such as polypropylene fiber.

[0037] <Packer mounting part 4> The packer mounting portion 4 has, for example, a fully threaded (e.g., steel) tip, and a hexagonal nut and washer at the rear end to clamp the packer 3 with a ring body 8. The fully threaded tip is fitted with a joint at the rear end, for example, a hollow joint sleeve. The joint may be configured so that the contact surfaces are integrated by welding, for example.

[0038] A through hole 7b for discharging grout 5 is provided at the rear end of the packer mounting part 4 (tip of the joint sleeve). The through hole 7b is drilled near the middle of the packer mounting part 4 (middle part: tip of the joint sleeve) as shown in the AA cross section, for example, as shown in Figure 3(b), and passes through the joint sleeve in the vertical direction. The through hole 7b is drilled from the top to the bottom of the middle part of the packer mounting part 4, for example, as shown in Figure 3(c).

[0039] The packer mounting part 4 may have various jigs (not shown) attached to its tip for drilling or soil removal. The jigs may be selected appropriately depending on, for example, the hardness and material of the flowing ground 10 and the state of the spring water, and may be attached to the tip of the packer mounting part 4. This allows the self-drilling rock bolt packer to be rotated and inserted when the hole wall collapses, making it possible to inject grout 5 after drilling.

[0040] The packer mounting portion 4 fixes the packer 3 with, for example, a hexagonal nut or a washer. The packer 3 may be clamped by, for example, a ring body 8. This allows the grout 5 to be filled reliably inside the packer 3.

[0041] The packer attachment part 4 is formed by, for example, fitting the rear end of the fully threaded bolt to the tip of a hollow joint sleeve via a joint. The rear end of the fully threaded bolt and the tip of the joint sleeve are firmly fixed together, for example, by welding the contact surfaces of their respective fitting points together. This allows the rock bolt 2 and packer attachment part 4 to be inserted without coming loose, even when drilling a hole in water-logged ground 10 or inserting the self-drilling rock bolt packer 1 into an already drilled hole 11b. Furthermore, because the packer 3 is secured in place by a joint, hex nut, and washer, the packer 3 can be inserted into the drilled hole 11 together with the packer attachment part 4 and rock bolt 2 without coming loose.

[0042] A through hole 7b for discharging grout 5 is provided at the rear end of the packer mounting part 4. For example, as shown in Figure 3(b), the through hole 7b is drilled near the middle (middle part) of the packer mounting part 4 as shown in the AA cross section, and passes through the joint sleeve that constitutes the packer mounting part 4. For example, as shown in Figure 3(c), the through hole 7b is drilled in the upper surface of the middle part of the packer mounting part 4.

[0043] <Grout 5> The grout 5 is injected, for example, through an injection port 6 at the rear end of the rock bolt 2, filled under pressure, and discharged through the multiple blind holes 7a in the rock bolt 2 and the through holes 7b in the packer mounting portion 4, filling the inside of the packer 3. The grout 5 is an injection material such as mortar, which has fluidity, quickly develops strength, and hardens inside the pipe of the rock bolt 2, inside the packer 3, and on the surface exposed from the packer 3. This reduces the risk of fragmentation or blockage of the mortar construction due to, for example, running water, while also making it possible to apply pressure to the packer 3 from multiple directions, improving watertightness and ensuring the prevention of leakage of the grout 5 (for example, construction mortar) from the packer 3 on a surface.

[0044] The grout 5 is pressurized and filled into the pipe of the rock bolt 2, and is discharged from the non-penetrating hole 7a and the through hole 7b. The grout 5 is pressurized and filled through the injection port 6 of the rock bolt 2, and is discharged through the pipe of the rock bolt 2 from the non-penetrating hole 7a and the through hole 7b. By filling with pressurized grout 5, the grout 5 gradually fills the empty space (area) inside the packer 3, filling the drilled hole 11. Therefore, the grout 5 is not discharged directly from the non-penetrating hole 7a and the through hole 7b into the drilled hole 11 (drilled hole 11a), and is therefore not washed away with the spring water. This minimizes water pollution caused by the escape of grout 5, and makes it possible to suppress surrounding water pollution and the burden and impact on the environment.

[0045] Next, an example of a waterstop construction method using the self-drilling rock bolt packer 1 will be described with reference to Figures 4 to 6. Figure 4 shows a waterstop construction method using the self-drilling rock bolt packer in flowing ground in this embodiment, with Figure 4(a) showing an example of the insertion step after the fitting step, and Figure 4(b) showing an example of the filling step in which grout is injected from the rear end of the rock bolt and filled under pressure.

[0046] FIG. 5(a) shows an example of a discharge process in which grout is discharged from multiple blind holes and non-penetrating holes, and FIG. 5(b) shows an example of a leakage process in which the discharged grout is leaked out from the surface of the packer to the outside.

[0047] The waterproofing method using the self-drilling rock bolt packer 1 in this embodiment is used for construction, for example, by the following steps. (1) A fitting step of sandwiching a packer 3 between a rock bolt 2 having a hollow structure and a plurality of non-through holes 7a and fitting a packer mounting portion 4 having through holes 7b; (2) a mounting step of mounting the packer 3 between the packer mounting portion 4 and the ring body 8 so that the packer 3 can be mounted; (3) A filling process including a process of inserting the packer 3 into the drilled hole 11a in the water-flowing ground after the packer 3 has been installed in the installation process and a process of injecting grout 5 from the rear end of the rock bolt 2 (FIG. 4(a)), and a process of pressurizing and filling the inside of the rock bolt 2 and the packer mounting portion 4 (FIG. 4(b)); (4) a discharging step of discharging the grout 5 pressurized and injected in the filling step from the plurality of non-penetrating holes 7a and the penetrating holes 7b; (5) a leakage step in which the grout 5 discharged in the discharge step is leaked to the outside from the surface of the packer 3; Contains:

[0048] In addition, in (1), for example, a process may be included in which the packer 3 is attached to the center of the packer mounting portion 4 using a ring body 8, and then the packer 3 is fastened with a washer and a hexagonal nut, and then a soil removal tool (such as a special bit) is attached to the tip. This allows grout 5 to be injected through the injection port 6 of the rock bolt 2 without pulling out the self-drilling rock bolt packer 1, and the packer is then placed directly into the drilled hole 11. This makes it possible to remove obstacles inside the drilled hole 11, maintain the hole wall, and ensure the inner diameter, and also reduces the risk of construction becoming impossible due to the collapse of the hole wall.

[0049] Furthermore, (1) may include, for example, a measuring step of measuring the amount or pressure of spring water flowing out of the drilled hole 11 (drilled hole 11b) using a known measuring sensor (not shown) or a photographing step of videotaping the location of the spring water (location of the crack) using a camera (not shown) to confirm and record the condition. This allows the state of the spring water in the drilled hole 11b to be accurately confirmed, making it possible to select an appropriate self-drilling rock bolt packer 1 and grout 5 and insert them into the drilled hole 11b. Note that while this embodiment uses a waterstop construction method using a self-drilling rock bolt packer 1 used to create a water-flowing ground 10, it may also be used for insertion into a drilled hole 11 from which spring water is not flowing, or for tunnel construction or underground construction other than waterstop construction.

[0050] In addition, in (2), after the packer mounting portion 4 and the ring body 8 are clamped so as to be attachable, a step of screwing a jig for drilling holes or removing soil onto the tip of the packer mounting portion 4 may be further included.

[0051] In addition, in (5), for example, the amount of water flowing from the water-flowing ground may be measured, and the grout 5 may be pressurized and filled depending on the result of the measured amount of water flow. Furthermore, in (5), for example, the pressure applied when injecting the grout 5 may be measured, and additional pressurized filling of the grout may be performed depending on the measured state of pressure.

[0052] (An example of a watertight construction method using a self-drilling rock bolt packer 1) Next, with reference to FIG. 6, an example of a water cutoff method using the self-drilling rock bolt packer 1 in flowing ground according to this embodiment will be described.

[0053] <Mating process S110> The rock bolt 2 is fitted into the packer mounting portion 4 (fitting step S110). The packer mounting portion 4 is fixed by a joint between the all-threaded thread and the joint sleeve. The fitting points of the all-threaded thread and the joint sleeve are integrated by welding to form the packer mounting portion 4.

[0054] In the fitting step S110, the rear end portion of the packer mounting part 4 (rear end portion of the joint sleeve) is fitted with the tip end of the rock bolt 2. A through hole 7b is drilled in the middle portion of the packer mounting part 4 (tip end portion of the joint sleeve), and the tip end of the rock bolt 2 is fitted behind this through hole 7b. As a result, the grout 5 filled under pressure from the injection port 6 of the rock bolt 2 is discharged from the through hole 7b.

[0055] The fitting process S110 may also include a measurement process for measuring the amount of water or water pressure of the spring water flowing out of the drilled hole 11 (drilled hole 11b) using a known measuring sensor, etc., and a photography process for videotaping the position of the spring water (position of the crack) using a camera, etc., to confirm and record the condition.

[0056] These measurement and photography processes make it possible to accurately check the state of the spring water in, for example, the drilled hole 11b, and to select the appropriate discharge jig, self-drilling rock bolt packer 1, and grout 5 and insert them into the drilled hole 11 (drilled hole b).

[0057] <Insertion step S120> Next, the packer 3 is attached so as to be sandwiched between the packer attachment part 4 and the ring body 8, and inserted into the drilled hole (insertion step S120). In the insertion step S120, for example, the packer 3 is attached from the tip end of the fully threaded part that constitutes the packer attachment part 4, or from the rear end of the rock bolt 2, and after being sandwiched by the ring body 8, it is fixed to the packer attachment part 4 using a washer and a hex bolt. In the insertion step S120, the self-drilling rock bolt packer 1 is then inserted into the drilled hole in the water-running ground.

[0058] In the insertion step S120, for example, after the packer mounting portion 4 and the ring body 8 are clamped so as to be attachable, a jig for drilling holes or removing soil may be screwed onto the tip of the packer mounting portion 4.

[0059] <Filling process S130> Next, grout 5 is injected to pressurize and fill the rock bolt 2 and packer mounting portion 4 (filling step S130). In the filling step S130, the packer 3 and rock bolt 2 are sandwiched between the packer mounting portion 4 in the insertion step S120, and then inserted into the drilled hole 11b in the water-running ground 10, as shown in Fig. 4(a), for example.

[0060] Next, as shown in Figure 4(b), grout 5 is injected from the injection port 6 of the rock bolt 2 inserted into the drilled hole 11b and filled under pressure. The grout 5 injected from the injection port 6 of the rock bolt 2 and filled under pressure flows inside the pipe of the rock bolt 2 and fills the inside of the rock bolt 2 and the rear end of the packer mounting part 4 (the tip of the joint sleeve).

[0061] In the filling step, for example, the amount of water flowing from the water-flowing ground 10 may be measured, and the grout 5 may be filled under pressure according to the result of the measured amount of water flow. The grout 5 to be filled under pressure may be filled by, for example, a pressure pump (not shown). The pressure pump may be equipped with sensors such as a pressure gauge or a flow meter (neither of which are shown).

[0062] The filling step S130 may include a measuring step of measuring various conditions, for example, using sensors that measure the pressure and filling amount of the grout 5 to be filled, and sensors that measure the spring water volume, water pressure, water pollution, etc. This allows the grout 5 to be appropriately filled under pressure, for example, when the spring water flow volume is excessive or the water pressure is high, and makes it possible to suppress water pollution and environmental loads caused by escape or outflow of the grout 5.

[0063] <Discharge process S140> 5(a), the grout 5 is discharged from the plurality of non-penetrating holes 7a and the through-holes 7b (discharge means S140). In the discharge step S140, the grout 5 is discharged from the plurality of non-penetrating holes 7a in the rock bolt 2 and the through-holes 7b in the packer mounting portion 4, enabling highly reliable injection around the rock bolt 2.

[0064] <Leakage process S160> 5(b), a small amount of grout 5 is leaked to the outside from the surface of the packer 3 (leakage step S150). In the leakage step S160, for example, the grout 5 discharged from the non-penetrating holes 7a of the rock bolt 2 and the penetrating holes of the packer mounting portion 4 in the discharge step S140 leaks out from the outer surface of the packer 3 in a small amount.

[0065] For example, of the discharged grout 5, only a small amount passes through the gaps between the fibers on the surface of the packer 3 and is exposed to the outside. As a result, most of the grout 5 remains inside the packer 3. The injection pressure of the grout 5 changes depending on, for example, the state of injection of the grout 5. For this reason, the amount and pressure of the injected grout 5 may be adjusted based on the values ​​of sensors that measure the pressure and filling amount of the grout 5. This allows for appropriate injection into the rock bolt 2, discharge into the packer 3, and leakage from the surface of the packer 3, and makes it possible to apply injection pressure at the surface of the packer 3 against the resistance of the water pressure of the spring water.

[0066] In the leakage step S160, for example, by adjusting the injection pressure of the grout 5, it is possible to fill the entire packer 3 with grout 5 evenly and with little bias. This makes it possible to press the outside of the packer 3 against the gaps in the drilled hole 11b as a surface against the cracks, unevenness, and gaps in the drilled hole 11b where water may seep in, making it possible to block the water while slightly exposing the grout 5. This makes it possible to prevent, for example, the escape and outflow of grout 5, minimize water pollution caused by the escape of grout 5, and reduce the burden and impact on the environment.

[0067] <Additional injection process S150> Next, depending on the state of the pressurized filling, additional grout 5 is injected (reinjection step S150). The reinjection step may be included in the filling step S130, and for example, the pressure applied when the grout 5 is injected is measured, and depending on the measured state of the pressure, additional grout 5 is pressure-filled.

[0068] In the filling step S130 and the additional injection step S150, for example, after a few minutes have passed since the start of injection of the grout 5, the reading on the pressure gauge (injection pressure gauge: not shown) exceeds the initial value, the packer 3 expands, and the amount of welling water decreases. If the pressure value drops from the initial value after the injection is stopped and left as it is, additional injection may be performed.

[0069] As a result, the pressure value begins to rise again, so for example, pressurized filling is carried out up to the reference value or above, and then injection of the grout 5 is stopped. By repeating this process, the injection hose of the grout 5 is closed when the amount of spring water reaches a minimum, and the injection of the grout 5 using the self-drilling rock bolt packer 1 is completed.

[0070] This completes the watertight construction method using the self-drilling rock bolt packer 1 in this embodiment.

[0071] Although the embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0072] 1 Self-drilling rock bolt packer 2 Rock Bolts 3. Packer 4 Packer mounting part 5. Grout 6 Inlet 7a Non-through hole 7b Through hole 8 Ring body 10 Flowing water ground 11 Drilling 11a Drilling (without water stop) 11b Drilling (with water stop) S110 Fitting process S120 Insertion process S130 Filling process S140 Discharge process S150 Leak process S160 Additional injection process

Claims

1. A self-drilling rock bolt packer used for creating flowing ground, A hollow rock bolt and a packer mounting portion that fits into the rock bolt and clamps a packer, The rock bolt is fitted with the packer mounting portion at its tip end, and has an injection port at its rear end for injecting grout and one or more blind holes in its middle for discharging the grout, The packer mounting portion is fitted with the tip portion of the rock bolt at its rear end and has a through hole in its middle portion for discharging the grout, The packer has liquid permeability, is attachably sandwiched between the packer mounting portion and a ring body, and is filled with the grout discharged from the non-penetrating hole and the penetrating hole; Self-drilling rock bolt packer characterized by:

2. 2. The self-drilling rock bolt packer according to claim 1, wherein the non-through holes are provided at least two apart in the longitudinal direction of the rock bolt.

3. 2. The self-drilling rock bolt packer according to claim 1, wherein the through hole is provided between the clamping position of the ring body and the position of the tip where the rock bolt is fitted.

4. 4. The self-drilling rock bolt packer according to claim 1, wherein the grout is injected from the injection port at the rear end of the rock bolt, discharged from the plurality of blind holes and the through hole, and filled inside the packer.

5. 2. The self-drilling rock bolt packer according to claim 1, wherein the packer mounting portion is provided at its tip with a jig for drilling holes or removing soil.

6. A water-stopping method using a self-drilling rock bolt packer used to create a water-flowing ground, a fitting step of sandwiching a packer between a hollow rock bolt having a plurality of non-through holes and a packer mounting portion having through holes; An insertion process in which the packer is attached between the packer mounting portion and the ring body and inserted into the borehole in the flowing water ground; a filling step of injecting grout from the rear end of the rock bolt after the inserting step, and pressurizing and filling the inside of the rock bolt and the packer mounting portion; A discharging step of discharging the grout injected under pressure in the filling step from the plurality of non-penetrating holes and the non-penetrating holes; a leakage step of causing the grout discharged in the discharge step to leak out from the surface of the packer; having A watertight construction method using a self-drilling rock bolt packer.

7. The filling step includes: Measuring the amount of water flowing from the water-flowing ground, and pressurizing and filling the grout according to the result of the measured amount of water flow; A waterproofing method using the self-drilling rock bolt packer according to claim 6.

8. The filling step includes: Further comprising a step of measuring the pressure applied when injecting the grout and adding pressurized filling of the grout according to the measured pressure state; A waterproofing method using the self-drilling rock bolt packer according to claim 6 or 7.

9. 7. A waterstop construction method using a self-drilling rock bolt packer according to claim 6, wherein the insertion step further includes a step of screwing a jig for drilling or removing soil onto the tip of the packer mounting part after the packer mounting part and the ring body are clamped so as to be attachable.

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