Rock bolt installation method

Abstract

To mechanize a series of rock bolt construction work to make it more efficient, and to miniaturize a rock bolt construction device to save installation space at a site.SOLUTION: In a rock bolt construction device 1, a perforation forming section 6 that forms perforations 201 in the ground 200, an ejecting section 71 of a transfer hose 7, which can move forward and backward, that drives a cement-based fixing material capsule 100 immersed in water into the perforation 201 using air pressure, a rock bolt pushing section 8 that pushes a rock bolt 110 into a hole 201 into which the cement-based fixing material capsule 100 has been driven are provided so as to be switchable to positions corresponding to the perforations 201 by rotational movement. A high-pressure air supply section 9 that supplies high-pressure air to the transfer hose 7 is attached to a loading section 73 of the transfer hose 7 that transfers the cement-based fixing material capsules 100 immersed in water to the ejecting section 71. A immersing tank 10 in which the cement-based fixing material capsules 100 are immersed in water is installed around the loading section 73.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rock bolt construction device and a rock bolt construction method for filling a cement-based fixing material into a drilled hole in a natural ground such as a tunnel and driving a rock bolt.

Background Art

[0002] Conventionally, there is a rock bolt construction device disclosed in Patent Document 1 as a construction device for filling a cement-based fixing material into a natural ground of a tunnel and driving a rock bolt. The rock bolt construction device of Patent Document 1 includes a drilling part provided with a drilling rod, a rock bolt insertion part for inserting a rock bolt, and a grout material filling part that holds an injection hose for filling grout material into the drilled hole in a retractable manner between the drilling part and the rock bolt insertion part. The drilling part, the rock bolt insertion part, and the grout material filling part are provided in parallel, and are configured to be swingable about the rotation contact fulcrum part at the tip as the rotation center with the rotation contact fulcrum part at the tip pressed against and fixed to the tunnel wall surface.

[0003] And this rock bolt construction device has a grout material supply device composed of a mixing mixer device part on the upper stage side and a grout material pressure feeding pump device part on the lower stage side. Each material of the cement-based grout material such as cement, water, and fine aggregate is input into the mixing mixer device part, and the cement-based grout material after mixing is sent out from the grout material pressure feeding pump device part into the drilled hole in the natural ground through the injection hose and filled.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The rock bolt installation device described in Patent Document 1 above has the advantage of improving efficiency by mechanizing a series of rock bolt installation operations, which include the operation of forming a hole in the ground, the operation of injecting a cement-based anchoring material into the hole, and the operation of inserting a rock bolt into the hole into which the cement-based anchoring material has been injected.

[0006] However, when injecting cement-based anchoring material into the boreholes, the cumbersome process of manually adding the appropriate amounts of each component of the cement-based grout material to the mixing device at the site is still insufficient in terms of improving work efficiency. Furthermore, the grout material supply device in the rock bolt construction device described in Patent Document 1, which consists of an upper mixing device and a lower grout material pumping device, is bulky, resulting in a larger rock bolt construction device. Since a larger rock bolt construction device makes it difficult to use in a narrow workspace, a smaller rock bolt construction device is desired.

[0007] In view of the above problems, the present invention is proposed to provide a rock bolt installation device and rock bolt installation method that can improve efficiency by mechanizing a series of rock bolt installation operations, which include the operation of forming a bore in the ground, supplying a cement-based anchoring material to the bore, and inserting a rock bolt into the bore containing the cement-based anchoring material, and can also reduce the installation space at the site by miniaturizing the rock bolt installation device. [Means for solving the problem]

[0008] The rock bolt installation apparatus of the present invention comprises a drilling forming unit that forms a hole in the ground, a transfer hose ejection unit that moves back and forth to drive a water-immersed cement-based anchoring material capsule into the drilling using air pressure, and a rock bolt pushing unit that pushes a rock bolt into the drilling in which the cement-based anchoring material capsule has been driven, and is provided so as to be switchable and positioned to correspond to the drilling by a rotational movement with the direction of extension of the drilling as the axial direction. A projection-shaped axial anchor is formed on the bolting head, which is provided with the drilling portion, the thrusting portion, and the lock bolt pushing portion. This anchor is pressed against the ground wall surface to fix and stabilize the axis of rotation for rotational movement with the direction in which the drilling extends as the axial direction.The invention is characterized in that a high-pressure air supply unit is attached to the loading section of the transfer hose, which transports the water-immersed cement-based fixing material capsules to the ejection section, and a immersion tank is installed around the loading section where the water-immersed cement-based fixing material capsules are loaded, in which the cement-based fixing material capsules are immersed in water. According to this, by installing a soaking tank for soaking cement-based anchoring material capsules in water around the loading section of the transfer hose, which transports water-soaked cement-based anchoring material capsules to the ejection section of the transfer hose, one worker can soak the cement-based anchoring material capsules in water and load them into the loading section of the transfer hose, thereby reducing labor and increasing efficiency in the work of supplying cement-based anchoring material to the drilling holes. Therefore, the entire rock bolt construction process, which includes forming drilling holes in the ground, supplying cement-based anchoring material to the drilling holes, and inserting rock bolts into the drilling holes supplied with cement-based anchoring material, can be mechanized to increase efficiency. In addition, the movement of the water-soaked cement-based anchoring material capsules can be minimized, preventing damage to the water-soaked cement-based anchoring material capsules outside the drilling holes. Furthermore, since there is no need to install a bulky grout supply device consisting of a mixing device and a grout material pump device, the rock bolt construction device can be miniaturized, saving space at the site.

[0009] The rock bolt installation method of the present invention is a rock bolt installation method using the rock bolt installation device of the present invention, wherein a drilling section is used to form a drill in the ground, Using cement-based anchoring capsules with a diameter of 26mm to 36mm and a length of 300mm to 600mm, During the aforementioned perforation formation The aforementioned The first step involves immersing the cement-based fixing material capsule in the immersion tank, and then positioning the ejection part of the transfer hose at the location of the drilling, inserting the tip of the ejection part into the drilling, and transferring the water-immersed cement-based fixing material capsule into the drilling. 4×10 5 ~7×10 5 PaThe invention is characterized by comprising: a second step of driving in with air pressure; and a third step of withdrawing the tip of the ejection part from the drilling hole, positioning the lock bolt pushing part at the location of the drilling hole, and pushing the lock bolt into the drilling hole, which contains the cement-based fixing material capsule in a water-immersed state. According to this, a single operator of the rock bolt installation device can simultaneously monitor the progress of drilling and immerse the cement-based anchoring material capsules in water. This makes the entire rock bolt installation process—which involves drilling holes in the ground, supplying cement-based anchoring material to the holes, and inserting rock bolts into the holes filled with cement-based anchoring material—even more efficient.

[0010] The rock bolt installation method of the present invention is A bolling head is provided with a bolling forming section for forming a bollard in the ground, a retractable transport hose for driving water-immersed cement-based anchoring material capsules into the bollard using air pressure, and a lock bolt pushing section for pushing a lock bolt into the bollard where the cement-based anchoring material capsules have been driven. The bolling head is configured to be switchable to a position corresponding to the bollard by a rotational movement with the direction of extension of the bollard as the axis of rotation. A protruding axial anchor is formed on the bolling head, which is pressed against the ground wall surface to fix and stabilize the axis of rotation of the rotational movement with the direction of extension of the bollard as the axis of rotation. A loading section for the transport hose for transporting water-immersed cement-based anchoring material capsules to the transport hose is provided on the transport hose. A rock bolt installation method using a rock bolt installation apparatus, wherein a high-pressure air supply unit is attached to the transfer hose to supply high-pressure air, and an immersion tank is installed around the loading unit into which the cement-based anchoring material capsules are loaded in a water-immersed state, the method comprising: a first step of forming a hole in the ground with the drilling forming unit, and using cement-based anchoring material capsules with a diameter of 26 mm to 36 mm and a length of 300 mm to 600 mm, immersing the cement-based anchoring material capsules in the immersion tank while the hole is being formed; and a second step of positioning the ejection unit of the transfer hose at the location of the hole, inserting the tip of the ejection unit into the hole, and inserting the water-immersed cement-based anchoring material capsules into the hole in a 4 × 10 5 ~7×10 5 The process comprises a second step of driving the bolt in with an air pressure of Pa, and a third step of removing the tip of the ejection part from the hole, positioning the lock bolt pushing part at the location of the hole, and pushing the lock bolt into the hole, which contains the cement-based fixing material capsule in a water-immersed state. In the second step, air is released from an air vent hole formed on the wall surface of the transfer hose and near the tip of the ejection part that is not inserted into the perforation, when the cement-based fixing material capsule is driven in while immersed in water. According to this method, air that is pushed back from inside the borehole out of the air sent in to propel the cement-based fixing agent capsule into the borehole is ejected from the air vent hole, preventing the air that bounces back from deep inside the borehole from pushing back the ejection part of the transfer hose or the cement-based fixing agent capsule. [Effects of the Invention]

[0011] According to the present invention, the series of rock bolt construction operations, which include forming a bore in the ground, supplying a cement-based anchoring material to the bore, and inserting rock bolts into the bore containing the cement-based anchoring material, can be mechanized to improve efficiency, and the rock bolt construction device can be miniaturized to save space at the site. [Brief explanation of the drawing]

[0012] [Figure 1]Side explanatory view showing a rock bolt construction device according to an embodiment of the present invention. [Figure 2] Schematic diagram showing the periphery of the loading part of the transfer hose in the rock bolt construction device of the embodiment. [Figure 3] Cross-sectional view of a cement-based fixing material capsule driven by the rock bolt construction device of the embodiment. [Figure 4] Perspective explanatory view of the bolting head in the rock bolt construction device of the embodiment. [Figure 5] (a) to (c) are schematic explanatory views for explaining the switching of the bolting head during drilling, when driving the cement-based fixing material capsule, and when pushing in the rock bolt. [Figure 6] (a) to (e) are process explanatory views for explaining the construction procedure of the rock bolt by the rock bolt construction device of the embodiment. [Figure 7] (a) to (c) are explanatory views for explaining air bleeding during driving the cement-based fixing material capsule. [Figure 8] Cross-sectional view of a tunnel in which a rock bolt is installed using the rock bolt construction device of the embodiment.

Mode for Carrying Out the Invention

[0013] 〔Rock bolt construction device of the embodiment〕 As shown in FIG. 1, the rock bolt construction device 1 according to an embodiment of the present invention is composed of a self-propelled vehicle body 2. A boom 3 extends forward of the vehicle body 2, and a bolting head 4 is provided at the tip of the boom 3. The boom 3 can perform a turning operation and a pitching operation with respect to the vehicle body 2 by an operating mechanism in which a hydraulic cylinder and a hinge part are combined. Further, the bolting head 4 can perform a turning operation and a pitching operation with respect to the boom 3 by an operating mechanism in which a hydraulic cylinder and a hinge part are combined. The operating mechanism of the boom 3 and the operating mechanism of the bolting head 4 are operated by an operation panel 5 installed around the operation seat 21 of the vehicle body 2 (see FIG. 2).

[0014] As shown in Figure 4, the bolting head 4 is provided with a drilling forming section 6 for forming a hole 201 in the ground 200, a retractable transport hose 7 ejection section 71 for driving a water-immersed cement-based anchoring material capsule 100 into the hole 201 using air pressure, and a lock bolt pushing section 8 for pushing a lock bolt 110 into the hole 201 into which the cement-based anchoring material capsule 100 has been driven. The drilling forming section 6, the transport hose 7 ejection section 71, and the lock bolt pushing section 8 can be switched and positioned to correspond to the hole 201 by a rotational movement with the direction in which the hole 201 extends as the axial direction (see the thick arrow in Figure 4).

[0015] A protruding axial anchor 41 is formed at the tip of the bolting head 4, projecting forward. The axial anchor 41 is pressed against the wall surface of the ground 200, such as a tunnel, when the drilling forming section 6, the ejection section 71 of the transfer hose 7, and the lock bolt pushing section 8 rotate, thereby fixing and supporting the axis of rotation for the rotational movement.

[0016] In the drilling section 6, a rock drill 62 is provided to move back and forth along a guide shell 61, and a drilling rod 63 extending forward from the rock drill 62 is held by a centralizer 64. When drilling into the ground 200, the drilling section 6 is positioned at the location where the drilling 201 should be formed, the rock drill 62 is advanced, and the drilling rod 63, to which rotational and impacting force is applied by the rock drill 62, and the drilling bit 65 attached to the tip of the drilling rod 63 (see Figure 6(a)), are used to form a drilling 201 in the ground 200 along the extension of the drilling line L1.

[0017] The transfer hose 7 is made of a flexible hose, such as a polyethylene hose, and the ejection section 71 of the transfer hose 7 is configured to move back and forth by the forward and reverse rotation of the rollers of a roller feeding device 72 attached to the tip of the transfer hose 7 (see the thick arrow in Figure 2). The water-immersed cement-based anchoring material capsules 100, which have been transferred to the ejection section 71 by air pressure through the transfer hose 7, are driven from the ejection section 71 into the boreholes 201 in the ground 200 along the ejection line L2.

[0018] The lock bolt insertion section 8 consists of a guide shell 81 and a lock bolt feeding device 82 that is provided to move back and forth along the guide shell 81. A lock bolt magazine 83 that supplies lock bolts 110 to the lock bolt feeding device 82 is provided adjacent to the guide shell 81. When the lock bolts 110 are driven, the lock bolt magazine 83 rotates to move the lock bolts 110 to the bolt driving line L3, and the lock bolts 110 that have been moved to the bolt driving line L3 are driven into the boreholes 201 in the ground 200 by the lock bolt feeding device 82.

[0019] As shown in Figure 5, the drilling section 6, the ejection section 71 of the transfer hose 7, and the lock bolt pushing section 8 are rotated in an arc around the axial anchor 41 as the center of rotation by the extension and retraction of the positioning cylinder 42 provided on the bolting head 4, and are switched and positioned to correspond to the drilling 201 during drilling, when driving in the cement-based anchoring material capsule 100, and when pushing in the lock bolt 110, respectively.

[0020] A high-pressure air supply unit 9 is attached to the loading section 73 of the transfer hose 7, which transfers the cement-based fixing material capsule 100 in a water-immersed state to the ejection section 71. In this embodiment, the high-pressure air supply unit 9 consists of an air compressor 91 and an air on / off valve 92 provided at the tip of an air supply tube extending from the air compressor 91, with the air on / off valve 92 attached to the loading section 73 of the transfer hose 7. The air on / off valve 92 is controlled to open and close by operation of the control panel 5, and when open, high-pressure air from the air compressor 91 is supplied to the transfer hose 7.

[0021] A immersion tank 10 into which the cement-based fixing agent capsules 100 are submerged in water is installed around the loading section 73 of the transfer hose 7 into which the water-immersed cement-based fixing agent capsules 100 are loaded. In this embodiment, the loading section 73 of the transfer hose 7, the immersion tank 10, and the control panel 5 are all installed around the operator's seat 21 of the vehicle body 2. A partition valve 74 is also provided in the loading section 73 of the transfer hose 7. One or more water-immersed cement-based fixing agent capsules 100 are loaded into the transfer hose 7 from the loading section 73, the partition valve 74 is closed, and then the air on / off valve 92 is opened to supply high-pressure air, causing the water-immersed cement-based fixing agent capsules 100 to be ejected from the ejection section 71 of the transfer hose 7.

[0022] The cement-based anchoring material capsules 100, which are driven in by the transfer hose 7, are, as shown in Figure 3, dry mixed mortar 101 composed of cement, fine aggregate, and admixture, wrapped in a permeable bag-shaped packaging material 102. They are used after being immersed in water for about 5 minutes, for example, just before being inserted into the borehole 201. It is preferable to use cement-based anchoring material capsules 100 that are wrapped in a permeable bag-shaped packaging material 102 that is not reinforced with reinforcing mesh or the like so that the packaging material is easily torn. Furthermore, to make them easy to blow away with high-pressure air, for example, if the capsule has a diameter of about 26 mm to 36 mm, it is desirable for the length to be about 300 mm to 600 mm, that is, it is preferable to use cement-based anchoring material capsules 100 that have about half the length of a normal cement-based anchoring material capsule installed manually.

[0023] When installing rock bolts 110 with the rock bolt installation device 1 of this embodiment, the drilling forming unit 6 is positioned at the location where a bore 201 should be formed in the ground 200 such as the tunnel wall, and the rock drill 62 is advanced to apply rotational and impacting force to the drilling rod 63 and drilling bit 65, thereby forming the bore 201 in the drilling forming unit 6 (see Figure 6(a)). After the bore 201 is formed, as shown in Figure 6(b), the rock drill 62 is retracted to remove the drilling rod 63 and drilling bit 65 from the bore 201, and the chips inside the bore 201 are removed by injecting drilling water.

[0024] Furthermore, the operator seated in the operator's seat 21 of the vehicle body 2, in parallel with the process of forming a bore 201 in the ground 200 with the aforementioned bore forming section 6, immerses the required number of cement-based anchoring material capsules 100 in the water W stored in the immersion tank 10 while the bore 201 is being formed.

[0025] Then, with the protruding axial anchor 41 pressed against the ground wall to stabilize the rotation axis, the ejection part 71 of the transfer hose 7 is rotated to position it at the drilling hole 201. As shown in Figure 6(c), the tip portion of the ejection part 71 of the transfer hose 7, for example, about 10cm to 20cm, is inserted into the drilling hole 201, and the required number of water-immersed cement-based fixing material capsules 100 are loaded into the transfer hose 7 from the loading part 73 of the transfer hose 7, and the partition valve 74 is closed. In this state, the air opening / closing valve 92 is opened and the transfer hose 7 is filled with, for example, 4 × 10 5 ~7×10 5 High-pressure air of approximately Pa is supplied, and the water-immersed cement-based fixing material capsule 100 is driven into the hole 201 by air pressure from the ejection section 71 of the transfer hose 7.

[0026] In this case, it is preferable to form an air vent hole 75, for example, with a diameter of about 10 mm, near the tip of the ejection portion 71 of the transfer hose 7, which is not inserted into the hole 201, so that when the water-immersed cement-based fixing material capsule 100 is driven into the hole 201 with air pressure, the air that is pushed back from inside the hole is vented, which prevents the cement-based fixing material capsule 100 from being pushed back by the air AR blown into the hole 201 (see Figure 7).

[0027] After driving the water-immersed cement-based anchoring material capsules 100 into the drilled holes 201, the tip of the ejection part 71 is withdrawn from the drilled holes 201, and with the protruding axial anchor 41 pressed against the ground wall to stabilize the rotation axis, the rock bolt pushing part 8 is rotated to the position of the drilled holes 201, and the rock bolts 110 are pushed into the drilled holes 201 which contain the required number of water-immersed cement-based anchoring material capsules 100 (see Figure 6(d)).

[0028] The permeable bag-shaped packaging material 102 of the water-immersed cement-based anchoring material capsule 100 inside the borehole 201 is ruptured by the pressing of the rock bolt 110, and the anchoring material 103, which is composed of water-immersed dry mix mortar 101, is filled between the borehole 201 and the rock bolt 110, thereby driving and anchoring the rock bolt 110 (see Figure 6(e)). The rock bolts 110 driven by the rock bolt installation device 1 in this manner are driven radially from the tunnel space T into the surrounding ground 200, for example, as shown in Figure 8.

[0029] According to this embodiment, by installing an immersion tank 10 for immersing the cement-based anchoring material capsules 100 in water around the loading section 73 of the transfer hose 7, which transfers the water-immersed cement-based anchoring material capsules 100 to the ejection section 71 of the transfer hose 7, one worker can immerse the cement-based anchoring material capsules 100 in water and load them into the loading section 73 of the transfer hose 7, thereby reducing the labor and efficiency of supplying the cement-based anchoring material 100 to the drilling holes 201. Therefore, the series of rock bolt construction operations, which include forming drilling holes 201 in the ground 200, supplying the cement-based anchoring material 100 to the drilling holes 201, and inserting the rock bolts 110 into the drilling holes 201 supplied with the cement-based anchoring material 100, can be mechanized to improve efficiency. In addition, the movement of the water-immersed cement-based anchoring material capsules 100 can be minimized, preventing damage to the water-immersed cement-based anchoring material capsules 100 outside the drilling holes 201. Furthermore, since there is no need to install a bulky grout supply device consisting of a mixing device and a grout material pump device, the rock bolt installation device 1 can be made smaller, saving space at the installation site.

[0030] Furthermore, according to a construction process in which the cement-based anchoring material capsule 100 is immersed in water in the immersion tank 10 while the bore 201 is being formed, one worker operating the rock bolt construction device 1 can simultaneously immerse the cement-based anchoring material capsule 100 while monitoring the progress of bore formation. This makes the entire rock bolt construction process, which involves forming bore 201 in the ground 200, supplying cement-based anchoring material 100 to the bore 201, and inserting rock bolts 110 into the bore 201 supplied with cement-based anchoring material 100, even more efficient.

[0031] Furthermore, by forming an air vent hole 75 near the tip of the ejection portion 71 of the transfer hose 7, which is not inserted into the hole 201, the air that is pushed back from inside the hole from the air vent hole 75 is ejected, preventing the air that bounces back from the back of the hole 201 from pushing back the ejection portion 71 of the transfer hose 7 or the injected cement-based fixing material capsule 100.

[0032] [Scope of the invention disclosed herein] The inventions disclosed herein include, in addition to the inventions, embodiments, and examples listed herein, the following modifications to these inventions to the extent applicable, or modifications to these inventions to the extent applicable, or modifications to these inventions to the extent applicable, or modifications to these inventions to the extent that partial effects are obtained, thereby creating broader concepts. The inventions disclosed herein also include the following modifications.

[0033] For example, in the above embodiment, the axial anchor 41 is pressed against the ground wall surface to stabilize the rotation axis of the rotational movement. However, if the rotation axis of the rotational movement of the drilling forming section 6, the ejection section 71 of the transfer hose 7, and the lock bolt pushing section 8 can be maintained without pressing the axial anchor 41 against the ground wall surface, the lock bolt installation device of the present invention can also be configured without the axial anchor 41. Furthermore, the configuration of the high-pressure air supply section, which is attached to the loading section 73 of the transfer hose 7 and supplies high-pressure air to the transfer hose 7, is appropriate within the scope of the spirit of the present invention. [Industrial applicability]

[0034] This invention can be used, for example, when installing rock bolts in the surrounding ground of a tunnel wall. [Explanation of Symbols]

[0035] 1…Rock bolt installation device 2…Vehicle body 21…Operator's seat 3…Boom 4…Bolting head 41…Axis anchor 42…Positioning cylinder 5…Control panel 6…Drilling and forming section 61…Guide shell 62…Rock drill 63…Drilling rod 64…Centralizer 65…Drilling bit 7…Transfer hose 71…Pushing section 72…Roller feeding device 73…Loading section 74…Gate valve 75…Air vent hole 8…Rock bolt pushing section 81…Guide shell 82…Rock bolt feeding device 83…Rock bolt magazine 9…High-pressure air supply section 91…Air compressor 92…Air on / off valve 10…Immersion tank 100…Cement-based anchoring material capsule 101…Dry mix mortar 102…Permeable bag-shaped packaging material 103…Anchorage material 110…Rock bolt 200…Ground 201…Drilling L1...Drilling line L2...Pushing line L3...Bolt driving line W...Water AR...Air T...Tunnel space

Claims

[Claim 1] A drilling unit for forming a bore in the ground, a transfer hose ejection unit for driving water-immersed cement-based anchoring material capsules into the bore using air pressure, and a lock bolt pushing unit for pushing lock bolts into the bore containing the cement-based anchoring material capsules are provided so as to be switchable and positioned to correspond to the bore by a rotational movement with the direction of extension of the bore as the axial direction. A projection-shaped axial anchor is formed on the bolting head, which is provided with the drilling portion, the thrusting portion, and the lock bolt pushing portion. This anchor is pressed against the ground wall surface to fix and stabilize the axis of rotation for rotational movement with the direction in which the drilling extends as the axial direction. A high-pressure air supply unit is attached to the loading section of the transfer hose, which transports the cement-based fixing material capsules in a water-immersed state to the ejection section, to supply high-pressure air to the transfer hose. A rock bolt installation method using a rock bolt installation device in which a water-immersed cement-based anchoring material capsule is loaded into a loading section, and a water-immersed tank is installed around the loading section into which the cement-based anchoring material capsule is immersed in water, The first step involves forming a bore in the ground using the bore-forming section, and immersing a cement-based anchoring material capsule, having a diameter of 26 mm to 36 mm and a length of 300 mm to 600 mm, in water in the immersion tank while the bore is being formed. A second step involves positioning the ejection part of the transfer hose at the location of the drilling hole, inserting the tip of the ejection part into the drilling hole, and driving the water-immersed cement-based fixing material capsule into the drilling hole with an air pressure of 4 × 10⁵ to 7 × 10⁵ Pa. The third step involves removing the tip of the ejection part from the drilling hole, positioning the lock bolt pushing part at the location of the drilling hole, and pushing the lock bolt into the drilling hole, which contains the cement-based fixing material capsule in a water-immersed state. A method for installing a rock bolt, characterized in that, in the second step, air is released from an air vent hole formed on the wall surface of the transfer hose and near the tip of the ejection part that is not inserted into the perforation, when the cement-based fixing material capsule is driven in while immersed in water.

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