Retrofit rock bolt installation device and rock bolt installation method using the same

Abstract

We provide an inexpensive, highly versatile, retrofittable rock bolt installation device. [Solution] This is an add-on type that can be attached to a general-purpose drilling device. An openable / closable tip catcher 30 is placed in place of the tip catcher 23, and a foldable intermediate receiver 31 is placed in place of the intermediate receiver 24. A rail member 34 is fixed to the guide shell 20 via an adapter plate 33, and an injection nozzle tip 37 that can move back and forth along the rail member 34 is provided. After forming a hole in the ground, a rock bolt insertion rod 41 and a rock bolt 44 are attached to the drifter 21 in place of the drilling bit rod 22. When the drifter 21 is advanced and the rock bolt 44 is inserted into the hole, the foldable intermediate receiver 31 is tilted and the openable / closable tip catcher 30 is opened on both sides, allowing the flat washer 42 to pass through each part.

Description

Technical Field

[0001] The present invention relates to a drilling device for forming a hole in a rock mass, which can be retrofitted with a device for installing a rock bolt inserted into the hole, and a post - attached type rock bolt installation device using a chemical resin capsule as a fixing material for the rock bolt filled in the hole, and a rock bolt installation method using the same.

Background Art

[0002] Conventionally, in mountain tunnel construction represented by the NATM method, for each excavation by blasting, shotcrete is sprayed on the excavation wall surface, and a large number of rock bolts are inserted vertically into the rock mass with respect to the tunnel wall surface and fixed with a grout material. After reinforcing the rock mass with shotcrete and rock bolts as main support members, a waterproof sheet is installed on the outer surface, and finally concrete lining is carried out.

[0003] Conventionally, for the construction of the above - mentioned rock bolts, after drilling with a drilling device, workers ride in a basket, manually insert the rock bolts into the holes, and further fill the grout material to fix the rock bolts. However, in recent years, the construction of these rock bolts has been mechanized.

[0004] For example, in Patent Document 1 below, in mountain tunnel construction by the NATM method, it is a rock bolt installation device for performing operations of drilling holes for rock bolts, filling grout material, and inserting rock bolts with respect to the wall surface, The rock bolt installation device includes a travelable base body, an arm unit extending from the base body, and a device main body provided at the tip of the arm unit. The device main body includes a rock bolt drilling device unit including a first guide shell, a first drifter provided to be able to move back and forth along the first guide shell, and a drilling rod held by the first drifter. A lock bolt loading device comprising a second guide shell, a second drifter provided to be movable back and forth along the second guide shell, and a lock bolt rack positioned adjacent to the guide shell, capable of holding a plurality of lock bolts around its periphery and for supplying lock bolts to the second drifter, A grout material filling device is provided in parallel between the aforementioned rock bolt drilling device and the aforementioned rock bolt insertion device, and the grout material filling device is provided in parallel, and the grout material filling device holds an injection hose for filling the hole with grout material so that it can move forward and backward. A rock bolt installation device is disclosed, characterized in that a rotating contact pivot point is provided at the tip of the main body of the device, and with this rotating contact pivot point pressed against and fixed to the tunnel wall, the rock bolt drilling device, the rock bolt insertion device, and the grout material filling device are able to swing about the rotating contact pivot point as the center of rotation, and when the main body of the device is viewed from the tip side, the shaft of the first drifter of the rock bolt drilling device, the shaft of the second drifter of the rock bolt insertion device, and the injection hose of the grout material filling device are located on an arc line centered on the rotating contact pivot point. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-19247 [Overview of the project] [Problems that the invention aims to solve]

[0006] According to the above-mentioned Patent Document 1, the positioning of the rock bolt drilling device, the rock bolt insertion device, and the grout material filling device can be easily performed solely by a swaying control operation centered on the rotational contact pivot point. This reduces the burden on the operator performing the series of operations and is superior in that it enables further efficiency improvements in the series of operations of drilling, filling with anchoring material, and inserting rock bolts.

[0007] However, conventional rock bolt installation equipment consists of a dedicated machine with a drilling device, a fixing material filling device, and a rock bolt insertion device all integrated from the start. This high cost of the equipment itself made it difficult to implement. This high cost of installation equipment was a major obstacle to the mechanization of rock bolt installation.

[0008] Therefore, the main objective of the present invention is to provide an inexpensive and highly versatile retrofit rock bolt installation device and an installation method using the same. [Means for solving the problem]

[0009] To solve the aforementioned problems, the present invention according to claim 1 provides a retrofit rock bolt installation device that can be attached to a drilling device comprising: a guide shell; a drifter provided to be movable back and forth along the guide shell; a drilling bit rod attached to the drifter and forming a bore in the ground; a tip catcher that holds the drilling bit rod at the tip of the guide shell; and an intermediate receiver that holds the drilling bit rod at the intermediate part between the tip catcher and the drifter, A holding device comprising: an openable tip catcher positioned at the tip of the guide shell in place of the aforementioned tip catcher, which can be switched between a state in which the drilling bit rod is held with the tip holders that can be opened and closed on both sides closed and a state in which the tip holders that can be opened and closed on both sides are expanded; and a foldable intermediate receiver positioned between the openable tip catcher and the drifter in place of the aforementioned intermediate receiver, which can be switched between a state in which the drilling bit rod is held with the foldable intermediate receiver raised and a state in which the intermediate receiver is tilted in the forward direction of the drifter, An injection device comprising: a rail member fixed to the guide shell via an adapter plate and extending along the guide shell; an injection nozzle base provided to be movable back and forth along the rail member and to which a pressure-resistant hose for pumping chemical resin capsules is connected; an injection nozzle tip inserted into a bore formed in the ground and for injecting chemical resin capsules from the tip; and a drive means for driving the injection nozzle base back and forth; When inserting a rock bolt into a hole formed in the ground using the drilling bit and rod, the rock bolt installation device consists of a rock bolt insertion rod attached to the drifter in place of the drilling bit and rod, and a rock bolt having a flat washer and nut attached to its head, with the nut fitted into a nut fitting portion provided at the tip of the rock bolt insertion rod, and held by the open / close tip catcher and the foldable intermediate receiver. The rock bolt installation device is provided, characterized in that, when the drifter is advanced to insert the rock bolt into a bore formed in the ground, the foldable intermediate support is tilted to allow the flat washer to pass through the foldable intermediate support, and the opening and closing tip catcher is opened on both sides to allow the flat washer to pass through the opening and closing tip catcher.

[0010] The invention described in claim 1 above is a retrofit rock bolt installation device that can be retrofitted to a commonly used drilling device by replacing and adding parts. Specifically, the tip catcher and intermediate chisel holder are replaced with an openable tip catcher and a foldable intermediate chisel holder, respectively, to form a drilling bit / rod holding device section, a rail member is fixed to the guide shell via an adapter plate, and an injection nozzle base and an injection nozzle tip are mounted on this rail member so as to be movable back and forth by a driving means to form a chemical resin capsule injection device section, a hole is formed in the ground with the drilling bit / rod, a rock bolt insertion rod is attached to the drifter in place of the drilling bit / rod, and a rock bolt with a flat washer and nut attached is fitted and held at the tip of this rock bolt insertion rod to form a rock bolt installation device section. In this way, a rock bolt installation device is retrofitted to the drilling device.

[0011] In the rock bolt installation device, when inserting a rock bolt into a hole by the feed operation of the drifter, there is a problem in that the flat washer (anchor plate) attached to the head of the rock bolt collides with the intermediate support or the tip catcher. However, in the installation device according to the present invention, the intermediate support and foldable catcher that were provided in the conventional drilling device are replaced with a foldable intermediate support and an openable / closable tip catcher, respectively. In the case of the foldable intermediate support, the intermediate holder of the rock bolt tilts in the forward direction of the drifter, and in the case of the openable / closable tip catcher, the tip holder of the rock bolt expands to both sides, so that there is no obstruction when the flat washer of the rock bolt passes through.

[0012] In this way, since a rock bolt installation device can be retrofitted to a general-purpose drilling device, costs can be significantly reduced compared to using a dedicated machine that includes a drilling device, rock bolt installation device, and grout filling device as a set. This makes it possible to provide an inexpensive and highly versatile retrofit rock bolt installation device.

[0013] As part of the present invention according to claim 2, a retrofit type lock bolt installation device is provided according to claim 1, wherein a spring structure is provided between the injection nozzle base and the injection nozzle tip, with a coil spring fitted to the spring structure to provide flexibility.

[0014] In the invention described in claim 2 above, when inserting a chemical resin capsule into a hole, a spring structure is provided between the injection nozzle base and the injection nozzle tip to facilitate insertion of the injection nozzle tip into the hole, and the flexibility of this spring structure allows the injection nozzle tip to deform to a certain extent.

[0015] As part of the present invention according to claim 3, the adapter plate is provided with a different structure corresponding to each model of the drilling device, and the rail member is fixed to the guide shell via the adapter plate that is suitable for the drilling device being used, as described in claim 1.

[0016] In the invention described in claim 3 above, in order to be compatible with all models of general-purpose drilling devices, adapter plates with different structures corresponding to each model are prepared to be interposed between the guide shell and the rail member, and the adapter plate that is suitable for the drilling device being used is used.

[0017] The present invention according to claim 4 is a rock bolt installation method using a retrofit rock bolt installation device that can be attached to a drilling device comprising: a guide shell; a drifter provided to move back and forth along the guide shell; a drilling bit rod held by the drifter and forming a bore in the ground; a tip catcher that holds the drilling bit rod at the tip of the guide shell; and an intermediate receiver that holds the drilling bit rod at the intermediate part between the tip catcher and the drifter, wherein the rock bolt installation method is provided using a retrofit rock bolt installation device that can be attached to a drilling device, Instead of the aforementioned tip catcher, an openable tip catcher is positioned at the tip of the guide shell, and it is possible to switch between a state in which the tip holders, which can be opened and closed on both sides, are closed to hold the drilling bit rod and a state in which the tip holders are expanded on both sides. In addition, instead of the aforementioned intermediate support, a foldable intermediate support is positioned between the openable tip catcher and the drifter, and it is possible to switch between a state in which the foldable intermediate support is raised to hold the drilling bit rod and a state in which the intermediate support is tilted in the forward direction of the drifter. Installation steps for a retrofit rock bolt installation device include: positioning a receiver, fixing a rail member extending along the guide shell via an adapter plate to the guide shell, providing an injection nozzle base on the rail member that is movable back and forth along the rail member and to which a pressure-resistant hose for pumping chemical resin capsules is connected, providing an injection nozzle tip that injects chemical resin capsules from its tip when inserted into a borehole formed in the ground, and providing a drive means on the guide shell for driving the injection nozzle base back and forth; A drilling process in which a bore is formed in the ground while applying rotational force, impact force, and thrust to the drilling bit rod by the drifter, The process of removing the drilling bit rod from the drifter, attaching a lock bolt insertion rod to the drifter, fitting the nut of a lock bolt with a flat washer and nut attached to its head into the nut fitting portion provided at the tip of the lock bolt insertion rod, and holding the lock bolt in the open / close tip catcher and the foldable intermediate receiver, A chemical resin capsule injection process in which, with the tip of the injection nozzle inserted into the hole, a chemical resin capsule is injected and the chemical resin capsule is deposited into the hole, A rock bolt installation method is provided using a retrofit rock bolt installation device, characterized by comprising a rock bolt installation step of inserting the rock bolt into a bore where the chemical resin capsule has been placed, while applying thrust with the drifter.

[0018] In the invention described in claim 4, as a method for installing a rock bolt using a retrofittable rock bolt installation device, after going through the attachment process of the retrofittable rock bolt installation device, a drilling process for forming a hole in the natural ground is performed. After that, the drill bit rod used for drilling is removed, a rod for inserting the rock bolt and the rock bolt are attached to the drifter, a chemical resin capsule injection process for inserting the chemical resin capsule into the hole is performed. Then, a rock bolt driving process for inserting the rock bolt into the hole into which the chemical resin capsule has been inserted is carried out. By this procedure, since the rock bolt installation device can be retrofitted to a general-purpose drilling device, the cost can be significantly reduced compared to the case of using a dedicated machine in which the drilling device, the rock bolt installation device, and the grout material filling device are set, and a low-cost and highly versatile retrofittable rock bolt installation device can be provided.

[0019] As the invention according to claim 5, there is provided a method for installing a rock bolt using the retrofittable rock bolt installation device according to claim 4, in which in the drilling process, the hole is formed with the tip of the injection nozzle removed.

[0020] In the invention described in claim 5, in the drilling process, when forming a hole while applying rotational force, impact force, and thrust to the drill bit rod by the drifter, there is a risk of deformation or damage to the tip of the injection nozzle due to vibration, impact, etc. Therefore, in the drilling process, the tip of the injection nozzle is removed from the base of the injection nozzle.

Effects of the Invention

[0021] As described in detail above, according to the present invention, a low-cost and highly versatile retrofittable rock bolt installation device and a construction method using the same can be provided.

Brief Description of the Drawings

[0022] [Figure 1] It is a longitudinal sectional view of a tunnel showing the excavation construction procedure of a mountain tunnel. [Figure 2] It is a perspective view showing a drilling device 1 equipped with a retrofittable rock bolt installation device 4 according to the present invention. [Figure 3] This is a perspective view showing the equipment configuration provided in the original guide shell 20. [Figure 4] This is a perspective view showing the assembly procedure for equipment to be replaced or retrofitted to the guide shell 20. [Figure 5] This is a perspective view showing the Drifter 21 with the lock bolt 44 attached. [Figure 6] This is a perspective view showing the injection nozzle tip 37 in a forward position. [Figure 7] This is a perspective view showing the lock bolt 44 in a forward position. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0024] Near the tunnel face S, as shown in Figure 1, tunnel construction heavy machinery such as a drilling device 1 (drill jumbo), a spraying machine 2, and a wheel loader 3 are positioned and excavation work is carried out. The illustrated example is a mini-bench method in which excavation is carried out by simultaneous operation of the upper and lower halves. The length of the upper bench is made extremely small, between 3 and 5.5 m, and in both the upper and lower halves, drilling and charging are performed on the tunnel face S using the drilling device 1, the upper and lower halves are cut away (blasted) in one go, then the spoil is removed by the wheel loader 3, primary spraying is performed on the wall surface using the spraying machine 2, steel supports are erected as needed, secondary spraying is performed, and then excavation is carried out according to the procedure for installing rock bolts.

[0025] The present invention is a device for mechanizing the installation of rock bolts in the construction of the aforementioned mountain tunnel. The installation of rock bolts is classified into drilling holes for the rock bolts in the wall surface, insertion of chemical resin capsules and rock bolts, and fixing of the rock bolt heads, but this invention mechanizes the work from drilling holes for the rock bolts to inserting the rock bolts.

[0026] [Post-installation lock bolt installation device 4] Normally, a dedicated rock bolt installation device is used for installing rock bolts, but in this invention, a retrofit rock bolt installation device is constructed by replacing or adding the necessary equipment to a drilling device 1 that performs drilling work.

[0027] The retrofit rock bolt installation device 4 according to the present invention is a retrofit device that can be attached to a general-purpose drilling device 1. As shown in Figure 2, the drilling device 1 includes a movable base body 10, an arm unit 11 extending from the base body 10, and a device body 12 provided at the tip of the arm unit 11. In the illustrated example, the base body 10 is shown as a wheeled type, but it may also be a caterpillar type. By making it movable, when the drilling procedure begins, it moves from the retraction area to the vicinity of the tunnel face S to perform the work. The arm unit 11 is capable of rotating and tilting its arm by a combination mechanism of a sliding joint and a hydraulic cylinder, and the device body 12 held at the tip can be controlled to any desired posture by a combination mechanism of a sliding joint and a hydraulic cylinder.

[0028] As shown in Figure 3, the device body 12 comprises a guide shell 20, a drifter 21 that is provided to move back and forth along the guide shell 20, a drilling bit rod 22 that is attached to the drifter 21 and forms a bore in the ground, a tip catcher 23 that holds the drilling bit rod 22 at the tip of the guide shell 20, and an intermediate receiver 24 that holds the drilling bit rod 22 at the intermediate part between the tip catcher 23 and the drifter 21.

[0029] The drifter 21 is controlled to move in the forward and backward directions along a rail on the guide shell 20, and is capable of forming a bore in the ground corresponding to the outer diameter of the drilling rod by pushing it into the ground while applying rotational and impacting forces to the drilling bit rod 22 using a predetermined hydraulic or pneumatic circuit.

[0030] The above is a description of a general-purpose drilling device 1, but the retrofit rock bolt installation device 4 according to the present invention is a device that enables the installation of rock bolts by retrofitting it to this general-purpose drilling device 1.

[0031] As shown in Figure 4, the retrofit rock bolt installation device 4 according to the present invention is equipped with a holding device section 32 which is positioned at the tip of the guide shell 20 in place of the tip catcher 23 and is capable of switching between a holding state and a non-holding state of the drilling bit rod 22 by opening and closing on both sides, an openable tip catcher 30 which can switch between a state in which the drilling bit rod 22 is held with the tip catcher 30a closed and a state in which the tip catcher 30a 30a is expanded on both sides, and a foldable intermediate receiver 31 which is positioned in the middle between the openable tip catcher 30 and the drifter 21 in place of the intermediate receiver 24 and is capable of switching between a state in which the drilling bit rod 22 is held with the intermediate receiver 31a raised and a state in which the intermediate receiver 31a is tilted in the forward direction of the drifter 21. In the drilling process, the drilling bit rod 22 is held by the holding device 32 while drilling work is performed on the ground using the drilling bit rod 22. In the rock bolt installation process, the rock bolt 44 is held by the holding device 32 while the rock bolt 44 is inserted into the drilled hole.

[0032] The openable tip catcher 30 consists of two tip holders 30a, 30a that can be opened and closed on both sides, and a hydraulic or pneumatic piston that supports both sides of these tip holders 30a, 30a. The lower ends of each tip holder 30a, 30a are supported so as to be rotatable around an axis that extends along the forward and backward direction of the drifter 21. By extending and retracting the piston, it is possible to switch between a closed state where both tip holders 30a, 30a are positioned facing each other in the center, and a state where they are expanded on both sides. When the tip holders 30a, 30a are closed, the semicircular recesses formed on each tip holder 30a are positioned facing each other, forming a rod insertion hole for the drilling bit rod 22. On the other hand, when the tip holders 30a, 30a are expanded, the semicircular recesses are separated from each other, making it impossible to hold the drilling bit rod 22.

[0033] The foldable intermediate support 31 includes a plate-shaped intermediate holder 31a with a U-shaped notch formed downward from its upper edge. The lower end of the intermediate holder 31a is supported so as to be rotatable within a certain angular range around an axis extending in both directions perpendicular to the forward and backward movement direction of the drifter 21. The intermediate holder 31a can be switched between a state in which it stands upright and holds the drilling bit rod 22 in the U-shaped notch, due to a restoring force such as a torsion coil spring, and a state in which the intermediate holder 31a, which stands upright against the elastic force of the torsion coil spring due to a pressing force from the drifter 21 side, tilts in the forward direction of the drifter 21. When the pressing force from the drifter 21 side is released, the intermediate holder 31a naturally returns to its upright state due to the restoring force of the torsion coil spring.

[0034] As shown in Figure 3, the retrofit rock bolt installation device 4 according to the present invention comprises an injection device section 39 consisting of a rail member 34 fixed to a guide shell 20 via an adapter plate 33 and extending along the guide shell 20, an injection nozzle base 36 provided to move back and forth along the rail member 34 and to which a pressure-resistant hose 35 for pumping chemical resin capsules is connected, an injection nozzle tip 37 that injects chemical resin capsules from its tip with its tip inserted into a bore formed in the ground, and a driving means 38 that drives the injection nozzle base 36 back and forth.

[0035] The rail member 34 is attached to the side or bottom of the guide shell 20 via an adapter plate 33 at a position that does not obstruct the movement of the drifter 21. Different adapter plates 33 with different structures are available to correspond to each model of the drilling device 1, and the one that is suitable for the drilling device 1 being used is used.

[0036] It is important that the mounting position of the rail member 34 is such that, when the injection nozzle base 36 is moved to the rearmost position, the tip of the injection nozzle tip 37 does not protrude in front of the tip of the guide shell 20, and when the injection nozzle base 36 is moved to the foremost position, the tip of the injection nozzle tip 37 protrudes in front of the tip of the guide shell 20 and can be inserted into a borehole formed in the ground.

[0037] Between the injection nozzle base 36 and the injection nozzle tip 37, a spring structure 40 is provided, which is a flexible tube made of rubber or resin with a coil spring fitted onto it to provide flexibility. By providing the spring structure 40 between the injection nozzle base 36 and the injection nozzle tip 37, it becomes easier to insert the injection nozzle tip 37 into the hole, and even if the position of the hole and the position of the injection nozzle tip 37 are slightly misaligned, the chemical resin capsule can be injected into the hole.

[0038] A driving means 38, such as a hydraulic jack, is used to move the injection nozzle base 36 along the rail member 34. A piston-type hydraulic jack is preferred, with one end fixed to the injection nozzle base 36 and the other end fixed to a jack base supported by the guide shell 20. The driving means 38 is not limited to a hydraulic jack; a rack and pinion mechanism, a belt or chain mechanism, or the like may also be used.

[0039] Furthermore, as shown in Figure 4, the retrofit rock bolt installation device 4 according to the present invention includes a rock bolt installation device section 45, which consists of a rock bolt insertion rod 41 that is attached to the drifter 21 in place of the drilling bit rod 22 when inserting a rock bolt into a hole formed in the ground by the drilling bit rod 22, and a rock bolt 44 which has a flat washer 42 and a nut 43 attached to its head, and the nut 43 is fitted into a nut fitting portion 41a provided at the tip of the rock bolt insertion rod 41, and is held by an openable / closable tip catcher 30 and a foldable intermediate receiver 31.

[0040] The lock bolt insertion rod 41 is a rod member with a circular cross-section, having a connecting portion for the drifter 21 at its rear end and a nut fitting portion 41a at its front end into which the nut 43 of the head of the lock bolt 44 can be fitted.

[0041] The lock bolt 44 is set with its head nut 43 fitted onto the nut fitting portion 41a of the lock bolt insertion rod 41, and with the bolt portion held by the open / close tip catcher 30 and the foldable intermediate receiver 31. It is then inserted into the hole by applying thrust through the feed operation of the drifter 21, and by applying rotational force or impact force as needed.

[0042] During the process of inserting the rock bolt 44 into the borehole, when the flat washer 42 attached to the head of the rock bolt 44 reaches the foldable intermediate support 31, the feed operation of the drifter 21 causes the flat washer 42 to press against the intermediate holder 31a of the foldable intermediate support 31, causing the intermediate holder 31a to tilt in the forward direction of the drifter 21. This allows the flat washer 42 to pass through the foldable intermediate support 31. Furthermore, when the flat washer 42 reaches the openable / closed tip catcher 30, the retraction action of the piston expands the tip holders 30a, 30a on both sides, allowing the flat washer 42 to pass through the openable / closed tip catcher 30. The openable / closed tip catcher 30 is positioned close to the ground surface at the tip of the guide shell 20, and if it were structured to tilt in the forward direction of the drifter 21 like the foldable intermediate support 31, there would be a risk of contact with the ground. Therefore, it is structured to open and close on both sides to prevent contact with the ground.

[0043] The driver's seat of the drilling device 1 is equipped with a chemical resin capsule input port 47 and a guidance computer 48, and the base 10 of the drilling device 1 is equipped with a hydraulic control device 50, a distribution board 51 and an air compressor 52.

[0044] The chemical resin capsule inlet 47 and the injection nozzle base 36 are connected by a pressure-resistant hose 35, and the air compressor 52 and the chemical resin capsule inlet 47 are connected by a pneumatic hose 53. Chemical resin capsules placed in the chemical resin capsule inlet 47 are pressurized through the pressure-resistant hose 35 to the injection nozzle base 36 by compressed air from the air compressor 52, which is sent through the pneumatic hose 53. The chemical resin capsules pressurized to the injection nozzle base 36 are further pressurized through the spring structure 40 and the injection nozzle tip 37 by air pressure and are injected to the outside from the tip of the injection nozzle tip 37.

[0045] The hydraulic control device 50 is connected to the pistons on both sides of the open / close tip catcher 30 by hydraulic hoses, and also to the drive means 38 by hydraulic hoses, and receives commands from the guidance computer 48 to perform hydraulic control of each device.

[0046] The distribution board 51 is connected to each device by electrical cables and supplies electricity to each device.

[0047] [Rock bolt installation method] Next, we will explain how to install rock bolts in the ground using the retrofit rock bolt installation device 4 described above.

[0048] (Installation process for the retrofitted lock bolt installation device 4) First, the process of attaching the retrofit lock bolt installation device 4 to the drilling device 1 is performed. Specifically, instead of the tip catcher 23, an openable tip catcher 30 is placed at the tip of the guide shell 20, which can be switched between a state in which the tip holders 30a, 30a are closed and hold the drilling bit rod 22, and a state in which the tip holders 30a, 30a are expanded on both sides. In addition, instead of the intermediate support 24, a foldable intermediate support 31 is placed between the openable tip catcher 30 and the drifter 21, which can be switched between a state in which the foldable intermediate holder 31a is upright and holds the drilling bit rod 22, and a state in which the intermediate holder 31a is tilted in the forward direction of the drifter 21. The holding device section 32 is then set on the guide shell 20.

[0049] Next, a rail member 34 extending along the guide shell 20 is fixed to the guide shell 20 via an adapter plate 33. An injection nozzle base 36 is provided on the rail member 34 so as to be able to move back and forth along the rail member 34, and a pressure-resistant hose 35 for pumping chemical resin capsules is connected to it. An injection nozzle tip 37 is also provided, which injects chemical resin capsules from its tip when its tip is inserted into a bore formed in the ground. A drive means 38 for driving the injection nozzle tip 37 back and forth is also provided on the guide shell 20, and the injection device unit 37 is set up.

[0050] A guidance computer 48 is installed in the driver's seat, and a distribution board 51 is installed on the drilling device 1, with wiring to each device. In addition, a hydraulic control device 50 is installed on the drilling device 1 and connected to the piston of the drive means 38 and the open / close tip catcher 30 with a hydraulic hose.

[0051] Furthermore, a chemical resin capsule inlet 47 is installed in the driver's seat, and the other end of a pressure-resistant hose 35, which is connected to the injection nozzle base 36, is connected to the discharge side of this chemical resin capsule inlet 47. An air compressor 52 is installed in the drilling device 1 and connected to the chemical resin capsule inlet 47 with an air pressure hose 53.

[0052] After connecting the electrical cable of the drilling device 1 to the power trolley, the hydraulic control device 50 is started, and the movement of each device and the power supply status are checked to complete the device installation process.

[0053] (Pre-entered into guidance computer 48) The following guidance items are pre-entered into the guidance computer 48. Guidance items: perforation diameter, perforation length, lock bolt diameter, lock bolt length, diameter and length of chemical resin capsule, setting value of sensor for detecting the range of chemical resin capsule injection within the perforation, air pressure for chemical resin capsule injection, rotation and stirring time of lock bolt 44, and holding time of lock bolt 44.

[0054] Based on the input of the guidance items (particularly the drilling diameter, drilling length, lock bolt diameter, lock bolt length, and the diameter and length of the chemical resin capsule), the guidance computer 48 automatically calculates the number of chemical resin capsules required per drilling location. Furthermore, in order to accurately determine the number of chemical resin capsules inserted into the drilling location, it is preferable to install a sensor at the chemical resin capsule insertion port 47 and have this sensor automatically count the number of capsules inserted.

[0055] (Drilling process) With the drilling bit rod 22 attached to the drifter 21, a drilling process is performed to form a bore in the ground by applying rotational force, impact force, and thrust to the drilling bit rod 22 using the drifter 21, in the same manner as drilling with a normal drilling device 1.

[0056] In the drilling process, where impact force is applied to the drifter 21, vibrations and shocks are transmitted to the guide shell 20, which may cause deformation or damage to the injection nozzle tip 37. Therefore, it is preferable to remove the spring structure 40 and the injection nozzle tip 37 from the injection nozzle base 36. At this time, it is preferable to use a one-touch connection mechanism for at least the connection between the injection nozzle base 36 and the spring structure.

[0057] Drilling with the drilling bit / rod 22 is performed at the rock bolt installation location, according to the length of the rock bolt 44. If there is an arm unit 11 that does not have the retrofit rock bolt installation device 4, drilling is also performed using that arm unit 11.

[0058] (Rock bolt holding process) Once drilling with the drilling bit rod 22 is complete, the drilling bit rod 22 is removed from the drifter 21, the lock bolt insertion rod 41 is attached to the drifter 21, and the nut 43 of the lock bolt 44, which has a flat washer 42 and a nut 43 attached to its head, is fitted into the nut fitting portion 41a provided at the tip of the lock bolt insertion rod 41, and the lock bolt 44 is held in the open / close tip catcher 30 and the foldable intermediate receiver 31 in a lock bolt holding process. If the retrofit lock bolt installation device 4 is provided on multiple arm units 11, the drilling bit rod 22 is replaced with a lock bolt 44 for each arm unit 11 as needed.

[0059] (Chemical resin capsule injection process) The chemical resin capsule injection process is performed by inserting the injection nozzle tip 37 into the hole while the injection nozzle tip 37 is inserted into the hole by moving the guide shell 20 and moving the injection nozzle base 36 back and forth by the drive means 38, thereby injecting the chemical resin capsule into the hole.

[0060] The chemical resin capsules are loaded by sliding open the lid of the chemical resin capsule loading port 47 in the driver's seat, setting the chemical resin capsule, closing the lid, and then using the air pressure from the air compressor 52 to pump them through the pressure-resistant hose 35. Since a total length of approximately 1.5m of chemical resin capsules can be loaded at once, the required number of capsules are inserted in appropriate amounts and then ejected using air pressure. The loading of chemical resin capsules is counted by the guidance computer 48 and continues until the required number, calculated in advance by the guidance computer 48, is reached.

[0061] (Rock bolt installation process) A rock bolt installation process is performed in which a rock bolt 44 is inserted into a bore containing a chemical resin capsule while rotational force and thrust are applied by the feed operation of the drifter 21.

[0062] Sensor information connected to the driver's seat guidance computer 48 indicates that when the tip of the lock bolt 44 reaches the chemical resin capsule inserted into the borehole, the screen displays instructions to rotate the lock bolt 44 by rotating the drifter 21. Following these instructions, the lock bolt 44 is rotated to agitate and mix the chemical resin capsule while pushing the lock bolt 44 into the borehole.

[0063] When the guidance computer 48 indicates that the rotational stirring time of the lock bolt 44 has reached a preset time, the rotation of the drifter 21 is stopped.

[0064] Once the rotation of the Drifter 21 is stopped, the holding time for the lock bolt 44 will be displayed, so maintain the lock bolt 44 in the holding position until that time has elapsed.

[0065] Once the holding time for the lock bolt 44 has elapsed, the drifter 21 and arm unit 11 are pulled back, the next lock bolt 44 is set on the lock bolt insertion rod 41, and the chemical resin capsule injection process and the lock bolt installation process are repeated for all the holes.

[0066] (Preparation process for the next step) Once the installation of rock bolts 44 into all holes is complete, the rock bolts 44 held in the drifter 21 are replaced with drilling bit rods 22 in the reverse procedure of the rock bolt holding process described above. In this way, with the retrofit rock bolt installation device 4 according to the present invention, switching between holding the rock bolts 44 or the drilling bit rods 22 in the drifter 21 can be done with a simple operation. [Explanation of symbols]

[0067] 1...Drilling device, 2...Spraying machine, 3...Wheel loader, 4...Post-installation lock bolt installation device, 10...Base, 11...Arm unit, 12...Device body, 20...Guide shell, 21...Drifter, 22...Drilling bit / rod, 23...Tip catcher, 24...Intermediate support only, 30...Open / close tip catcher, 31...Foldable intermediate support only, 32...Holding device section, 33...Adapter plate, 34...Rail member, 35...Durable Pressure hose, 36... Injection nozzle base, 37... Injection nozzle tip, 38... Driving means, 39... Injection device section, 40... Spring structure section, 41... Lock bolt insertion rod, 42... Flat washer, 43... Nut, 44... Lock bolt, 45... Lock bolt installation device section, 47... Chemical resin capsule inlet, 48... Guidance computer, 50... Hydraulic control device, 51... Distribution board, 52... Air compressor, 53... Pneumatic hose

Claims

1. A retrofit rock bolt installation device that can be attached to a drilling device comprising a guide shell, a drifter provided to move back and forth along the guide shell, a drilling bit rod attached to the drifter and forming a bore in the ground, a tip catcher that holds the drilling bit rod at the tip of the guide shell, and an intermediate receiver that holds the drilling bit rod at the intermediate part between the tip catcher and the drifter, A holding device comprising: an openable tip catcher positioned at the tip of the guide shell in place of the aforementioned tip catcher, which can be switched between a state in which the drilling bit rod is held with the tip holders that can be opened and closed on both sides closed and a state in which the tip holders that can be opened and closed on both sides are expanded; and a foldable intermediate receiver positioned between the openable tip catcher and the drifter in place of the aforementioned intermediate receiver, which can be switched between a state in which the drilling bit rod is held with the foldable intermediate receiver raised and a state in which the intermediate receiver is tilted in the forward direction of the drifter, An injection device comprising: a rail member fixed to the guide shell via an adapter plate and extending along the guide shell; an injection nozzle base provided to be movable back and forth along the rail member and to which a pressure-resistant hose for pumping chemical resin capsules is connected; an injection nozzle tip inserted into a bore formed in the ground and for injecting chemical resin capsules from the tip; and a drive means for driving the injection nozzle base back and forth; When inserting a rock bolt into a hole formed in the ground using the drilling bit rod, the rock bolt installation device consists of a rock bolt insertion rod attached to the drifter in place of the drilling bit rod, and a rock bolt having a flat washer and nut attached to its head, with the nut fitted into a nut fitting portion provided at the tip of the rock bolt insertion rod, and the rock bolt being held by the open / close tip catcher and the foldable intermediate receiver. A retrofit rock bolt installation device characterized in that, when the drifter is advanced to insert the rock bolt into a bore formed in the ground, the foldable intermediate support is tilted to allow the flat washer to pass through the foldable intermediate support, and the opening and closing tip catcher is expanded on both sides to allow the flat washer to pass through the opening and closing tip catcher.

2. The retrofit lock bolt installation device according to claim 1, wherein a spring structure is provided between the injection nozzle base and the injection nozzle tip, with a coil spring fitted to the outside to provide flexibility.

3. The retrofit lock bolt installation device according to claim 1, wherein the adapter plate is provided with a different structure corresponding to each model of the drilling device, and the rail member is fixed to the guide shell via the adapter plate that is suitable for the drilling device being used.

4. A rock bolt installation method using a retrofit rock bolt installation device that can be attached to a drilling device comprising a guide shell, a drifter provided to move back and forth along the guide shell, a drilling bit rod held by the drifter and forming a bore in the ground, a tip catcher that holds the drilling bit rod at the tip of the guide shell, and an intermediate receiver that holds the drilling bit rod at the intermediate part between the tip catcher and the drifter, wherein Instead of the aforementioned tip catcher, an openable tip catcher is positioned at the tip of the guide shell, and it is possible to switch between a state in which the tip holders, which can be opened and closed on both sides, are closed to hold the drilling bit rod, and a state in which the tip holders are expanded on both sides. In addition, instead of the aforementioned intermediate support, a foldable intermediate support is positioned between the openable tip catcher and the drifter, and it is possible to switch between a state in which the foldable intermediate support is raised to hold the drilling bit rod, and a state in which the intermediate support is tilted in the forward direction of the drifter. Installation steps for a retrofit rock bolt installation device include: positioning a receiver, fixing a rail member extending along the guide shell via an adapter plate to the guide shell, providing an injection nozzle base on the rail member that is movable back and forth along the rail member and to which a pressure-resistant hose for pumping chemical resin capsules is connected, providing an injection nozzle tip that injects chemical resin capsules from its tip when inserted into a borehole formed in the ground, and providing a drive means on the guide shell for driving the injection nozzle base back and forth; A drilling process in which a bore is formed in the ground while applying rotational force, impact force, and thrust to the drilling bit rod by the drifter, The process of removing the drilling bit rod from the drifter, attaching a lock bolt insertion rod to the drifter, fitting the nut of a lock bolt with a flat washer and nut attached to its head into the nut fitting portion provided at the tip of the lock bolt insertion rod, and holding the lock bolt in the open / close tip catcher and the foldable intermediate receiver, A chemical resin capsule injection process in which, with the tip of the injection nozzle inserted into the hole, a chemical resin capsule is injected and the chemical resin capsule is deposited into the hole, A rock bolt installation method using a retrofit rock bolt installation device, characterized by comprising a rock bolt installation step of inserting the rock bolt into a bore into which the chemical resin capsule has been placed, while applying thrust with the drifter.

5. A method for installing a lock bolt using the retrofit type lock bolt installation device according to claim 4, wherein the drilling step involves forming a hole with the tip of the injection nozzle removed.

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