System and method for injecting filler into rock bolt hole

Abstract

In the process of injecting a filler into a rock bolt hole formed in the natural ground, a required amount of filler is filled into the rock bolt hole. [Solution] An injection pipe 19 extending from an injection pump 10 is inserted into a rock bolt hole 5, and a filler material 6 from the injection pump 10 is injected into the rock bolt hole 5. The discharge flow rate q of the filler material 6 is measured by a flow meter 20. When an integrated injection amount Q based on the flow rate measured by the flow meter 20 reaches a pre-filling injection amount Q1 obtained by subtracting a predicted inertial discharge amount Q2 of the filler material 6 during the inertial discharge time after the injection pump 10 is stopped from a required filling amount Q0 for the rock bolt hole 5, an instruction to stop the injection pump 10 is given by an indicator light 40 and a buzzer 45.

Description

[Technical field]

[0001] The present invention relates to rock bolting work in which rock bolts are inserted into rock bolt holes formed in the natural ground around a tunnel or on a slope, and in particular to a system and an injection method for injecting a filler into a rock bolt hole before or after insertion. [Background technology]

[0002] For example, in the construction of mountain tunnels, rock bolting work is carried out to insert rock bolts into the ground from the tunnel excavation face in order to stabilize the excavated ground. Rock bolting work includes a process of forming rock bolt holes in the ground and injecting a filler material such as mortar into the rock bolt holes (see Patent Document 1, etc.).

[0003] In the injection process, the tip of the injection pipe extending from the injection pump is inserted all the way into the back end of the rock bolt hole, and then the injection pump is used to pump mortar or other filler material. This causes the filler material to be discharged from the tip of the injection pipe and injected into the rock bolt hole. While injecting, the injection pipe is gradually pulled toward the operator. When the filler material overflows from the proximal opening of the rock bolt hole that opens onto the tunnel excavation surface, it is determined that the filler material has been filled into the rock bolt hole, and the injection pump is stopped. Then, a rock bolt is inserted into the rock bolt hole. After inserting a rock bolt into a rock bolt hole, a filler material may be filled into the gap between the inner periphery of the rock bolt hole and the rock bolt.

[0004] Patent Document 1 describes that a flow meter is provided on an injection pump to obtain the amount of filler filled, which can be used to determine whether there are any construction defects and the condition of the surrounding ground. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-021449 A Summary of the Invention [Problem to be solved by the invention]

[0006] By providing a flow meter to the injection pump as in Patent Document 1, it is possible to construct a system that can determine whether filling is complete from the measurement value. On the other hand, according to the inventor's findings, when a certain amount of filler was discharged from the injection pump, the integrated flow rate measured by the flow meter did not reach the certain amount. In view of such findings, the present invention has an object to fill a required amount of filler into a rock bolt hole formed in natural ground in a process of injecting filler into the rock bolt hole. [Means for solving the problem]

[0007] In order to solve the above problems, the inventors have conducted extensive research. One of the reasons for the discrepancy between the actual discharge volume of the injection pump and the integrated measured flow rate of the flow meter is that the filler pushed out from the injection pump into the injection tube has inertia. This type of filler has a relatively large mass and therefore a large inertia, so even if the power supply to the injection pump is stopped, it continues to flow through the injection tube for a while and is discharged from the tip of the injection tube. It is thought that this inertial discharge volume after the power supply is stopped causes the discrepancy with the integrated measured flow rate. In view of the above circumstances, the present invention provides a filler injection system for injecting a filler into a rock bolt hole formed in natural ground, the system comprising: An injection pump that discharges the filler; an injection pipe extending from the injection pump and inserted into the rock bolt hole; A flow meter that measures the discharge flow rate of the filler; a determination unit that determines whether an injection amount of the filler into the rock bolt hole based on a flow rate measured by the flow meter has reached a pre-filling injection amount obtained by subtracting a predicted inertial discharge amount of the filler during an inertial discharge time after the injection pump is stopped from a required filling amount of the rock bolt hole; a stop instruction unit that instructs the injection pump to stop in response to the determination; The present invention is characterized by comprising:

[0008] Preferably, the filler injection system comprises: A flow meter that measures the flow velocity of the discharged filler; A calculation unit that calculates the inertial discharge predicted amount based on the flow velocity measured by the flow meter; It further comprises:

[0009] Preferably, the stop instruction unit includes an alarm unit for stopping the operation, and examples of the alarm unit include an indicator light, a buzzer, a monitor, and the like.

[0010] Preferably, the stop instruction unit includes an output unit for outputting a command signal for automatically stopping the infusion pump.

[0011] The method of the present invention is a filler injection method for injecting a filler into a rock bolt hole formed in a natural ground by an injection pump, comprising the steps of: a step of inserting an injection pipe extending from the injection pump into the rock bolt hole to perform the injection; Measuring the discharge flow rate of the filler with a flow meter; a step of issuing an instruction to stop the injection pump when the injection amount of the filler into the rock bolt hole based on the flow rate measured by the flow meter reaches a pre-filling injection amount obtained by subtracting a predicted inertial discharge amount of the filler during an inertial discharge time after the injection pump is stopped from a required filling amount of the rock bolt hole; The present invention is characterized by comprising:

[0012] Preferably, the filler injection method comprises: Measuring the discharge flow rate of the filler with a flow rate meter; calculating the predicted inertial discharge amount based on the flow velocity measured by the flow meter; It further comprises: The predicted inertial discharge amount may be set according to a length of the injection tube. The predicted inertial discharge amount may be set according to the elevation difference between the injection pump and the rock bolt hole. Effect of the Invention

[0013] According to the present invention, in the process of injecting a filler material into a rock bolt hole formed in the natural ground, a required amount of filler material can be injected into the rock bolt hole. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram showing an overview of a filler injection system for rock bolting work according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a configuration diagram of the filler injection system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 shows a mountain tunnel 1 under construction. In the mountain tunnel 1, rock bolts 3 are being driven into the natural ground 2 from a tunnel excavation face 1a to which shotcrete (not shown) has been sprayed.

[0016] In rock bolt construction, rock bolt holes 5 are drilled in the natural ground 2 by a drill jumbo 4. Mortar 6 (filler) is injected into the formed rock bolt holes 5 by a filler injection system 9, and then the rock bolts 3 are inserted.

[0017] As shown in Fig. 1, a transport vehicle 8 such as a 4-ton truck is driving into a mountain tunnel 1 under construction. The transport vehicle 8 is deployed near a drill jumbo 4. A filler injection system 9 is loaded on the loading platform of the transport vehicle 8. The filler injection system 9 includes an injection pump 10, an injection pipe 19, a flow meter 20, a flow velocity meter 21, a control panel 30, and alarm units 40, 45.

[0018] As shown in Fig. 2, the injection pump 10 is configured by a general concrete pouring pump, and includes a pump section 11, a mixer 12, and an on / off switch 13. A hopper 14 (solid raw material input section) is provided on the upper part of the mixer 12. A water supply line 15 (liquid raw material input section) is connected to the mixer 12.

[0019] A cylindrical pump section 11 extends from the mixer 12. The pump section 11 is provided with a screw 11a therein.

[0020] An on / off switch 13 is used to start and stop the operation of the injection pump 10 . By operating the injection pump 10, cement 6a (solid raw material) charged into the hopper 14 and water 6w (liquid raw material) from the water supply line 15 are mixed in the mixer 12 to produce mortar 6 (filler material). The mortar 6 is pushed out from the pump section 11 into the injection pipe 19 by the rotation of the screw 11a.

[0021] As shown in FIG. 1, an injection pipe 19 extends from the discharge port 11p of the pump unit 11 to the elevated work platform 4d of the drill jumbo 4, and is inserted from there into the rock bolt hole 5 to be injected.

[0022] As shown in Fig. 2, a flowmeter 20 and a flow velocity meter 21 are interposed between the discharge port 11p and the injection pipe 19 or in the middle of the injection pipe 19. The flowmeter 20 measures the discharge flow rate q (instantaneous flow rate) of the mortar 6 from the injection pump 10. Preferably, the flowmeter 20 is an electromagnetic flowmeter that detects an electromotive force (voltage) generated by electromagnetic induction caused by the flow of a fluid (conductor) and a magnetic field. More preferably, the flowmeter 20 is a digital flowmeter that outputs the detected voltage, i.e., the measurement value of the mortar flow rate, as a digital signal.

[0023] The flow rate meter 21 measures the flow rate v of the mortar 6 discharged from the injection pump 10. Preferably, the flow rate meter 21 is a digital flow rate meter that outputs the measured flow rate value as a digital signal. The flow meter 20 may also function as a flow velocity meter, and the flow velocity may be calculated by dividing the flow rate by the cross-sectional area of ​​the flow path. The flow velocity meter 21 may also function as a flow meter, and the flow rate may be calculated by multiplying the flow velocity by the cross-sectional area of ​​the flow path.

[0024] As shown in FIG. 2, the control panel 30 includes a processing unit 31 (judgment unit, calculation unit), a signal conversion unit 32, and a setting unit 33. Preferably, an outer casing 34 of the control panel 30 is waterproof and dustproof. The processing unit 31 includes a CPU 31a and a memory unit 31m, and performs control operations of the filler injection system 9. The memory unit 31m stores a control program and an arithmetic expression for operating the filler injection system 9. The arithmetic expression includes an arithmetic expression for calculating an inertial discharge predicted amount Q2 described later. The processing unit 31 may be configured by a personal computer (hereinafter referred to as "PC") or a programmable logic controller (hereinafter referred to as "PLC").

[0025] The processing unit 31 and the signal conversion unit 32 are connected by wire such as an Ethernet cable 35. The processing unit 31 may include the signal conversion unit 32.

[0026] The signal conversion unit 32 is configured by, for example, an Ethernet switch. The processing unit 31 and various input / output devices are connected to be able to transmit signals via the signal conversion unit 32. The input devices connected to the signal conversion unit 32 and thus the processing unit 31 include the on / off switch 13, the flow meter 20, the flow velocity meter 21, the setting unit 33, etc. The output devices connected to the signal conversion unit 32 and thus the processing unit 31 include the indicator light 40, the buzzer 45, etc.

[0027] The setting unit 33 accepts input of various set values. The set values ​​include the required filling amount Q0 of mortar 6 (filler) for each rock bolt hole 5. The required filling amount Q0 is the volume of mortar 6 required to fill the rock bolt hole 5 to its full capacity, and is derived based on the volume of the rock bolt hole 5, i.e., the product of the diameter of the drilling bit and the drilling depth. The required filling amount Q0 may be set taking into consideration the cross-sectional area of ​​the rock bolt 3 as well.

[0028] Preferably, the setting unit 33 is a digital device that receives the set value as a numerical value (digital) and outputs the set value as a digital signal to the signal conversion unit 32. The set value of the required filling amount Q0 and the like set by the setting unit 33 is input to the processing unit 31 via the signal conversion unit 32. The processing unit 31 (judgment unit) judges, based on the measured flow rate q by the flow meter 20 and the required filling volume Q0 by the setting unit 33, whether the amount of mortar injected into the rock bolt hole 5 has reached the amount corresponding to the timing for stopping the injection pump (the injection volume Q1 before filling described below).

[0029] 2, the indicator lights 40 (light-based alarm units) are preferably arranged in locations with good visibility of the mortar injection site in the tunnel 1. For example, the indicator lights 40 are provided on the upper ends of the pillars 44 erected on the transport vehicle 8.

[0030] The indicator light 40 includes, for example, three (multiple) stages (stages) of light emitting parts 41, 42, 43 arranged vertically. These light emitting parts 41 to 43 emit light of different colors. For example, the light emitting part 41 in the upper stage emits red light, the light emitting part 42 in the middle stage emits yellow light, and the light emitting part 43 in the lower stage emits blue or green light, but the present invention is not limited to this. Preferably, the indicator light 40 is a rotating indicator light in which the light emitting parts 41 to 43 are rotated.

[0031] The indicator light 40 is controlled to flash by the control panel 30. The degree of injection of mortar into each rock bolt hole 5 is indicated by the number of lit light-emitting elements 41-43 of the indicator light 40. As the number of lit light-emitting elements 41-43 increases, the degree of injection increases. The lighting of all light-emitting elements 41, 42, 43 indicates an instruction to stop the injection pump 10.

[0032] In addition, a buzzer 45 (an alarm unit that issues an alarm by sound) is controlled by the control panel 30. The alarm sound from the buzzer 45 indicates an instruction to stop the injection pump 10. Indicator light 40 and buzzer 45 constitute a stop instruction unit that instructs injection pump 10 to stop in response to a determination made by processing unit 31 (determination unit).

[0033] In rock bolting work, the filler injection system 9 is operated as follows to fill the rock bolt holes 5 with mortar (filler). <Required filling amount setting process> The required filling amount Q0 of mortar 6 (filler) in the rock bolt hole 5 to be injected is set in advance by the setting unit 33. The set required filling amount Q0 is sent to the processing unit 31 and stored in the memory unit 31m. By inputting values ​​such as the length and inner diameter of the rock bolt hole 5, which are calculation factors for the required filling amount Q0, into the setting unit 33, the input data may be sent to the processing unit 31 via the signal conversion unit 32, and the processing unit 31 may calculate the required filling amount Q0. Preferably, the required filling amount setting step is performed each time the length or cross-sectional area of ​​the rock bolt hole 5 to be injected is changed.

[0034] <Injection tube insertion process> 1, worker B in charge of operating the injection pipe stands on, for example, the elevated work platform 4d of a drill jumbo 4 and inserts the injection pipe 19 from the proximal opening 5a of the rock bolt hole 5 into the target rock bolt hole 5. When the tip of the injection pipe 19 has been inserted all the way into the inner end of the rock bolt hole 5, the worker B gives a signal.

[0035] <Injection pump start-up process> In response to the signal, worker A in charge of operating the injection pump operates on / off switch 13 of injection pump 10 to start operation.

[0036] <Injection process> By operating the injection pump 10, mortar 6 is pumped from the injection pump 10 into the injection pipe 19, discharged from the tip of the injection pipe 19, and injected into the rock bolt hole 5. While injecting, worker B gradually pulls the injection pipe 19 towards the worker. As a result, mortar 6 is filled from the back end of the rock bolt hole 5 towards the worker.

[0037] <Flow rate measurement process> During the injection process, the flow rate q (L / min) of the mortar 6 is measured by the flowmeter 20. The measured mortar flow rate is input to the processing unit 31 via the signal conversion unit 32. The processing unit 31 integrates the input measured flow rates to calculate the current measured injection amount Q (L) of the mortar 6 in the rock bolt hole 5 being injected.

[0038] <Injection degree calculation process> Furthermore, the processing unit 31 reads out the set value of the required filling amount Q0 from the storage unit 31m, and calculates the ratio R between the measured injection amount Q and the required filling amount Q0 by the following formula. R=Q / Q0 (1) The ratio R indicates the degree of mortar injection in the rock bolt hole 5 during injection relative to the required filling amount Q0.

[0039] The processing unit 31 adjusts the number of the light emitting units 41 to 43 to be turned on among the indicator lamps 40 according to the calculated injection degree R. By checking the illumination status of the indicator lamp 40, the worker B in charge of operating the injection pipe can accurately grasp in real time the degree of injection of the mortar 6 into the rock bolt hole 5 during the injection work. Depending on the illumination status, the worker B adjusts the pulling speed of the injection pipe 19 toward the worker. This allows the worker B to pull the injection pipe 19 toward the worker at an appropriate speed without relying on intuition.

[0040] <Inertial discharge predicted amount calculation process> In parallel with the flow rate measurement by the flowmeter 20, the discharge flow velocity v (m / min) of the mortar 6 is measured by the flow rate meter 21. The measured flow velocity v is input to the processing unit 31 via the signal conversion unit 32. The processing unit 31 (calculation unit) calculates an inertial discharge predicted amount Q2 based on the measured flow velocity v.

[0041] Specifically, the inertial discharge predicted amount Q2 is the amount (L) of mortar 6 predicted to be discharged by inertia when the injection pump 10 is stopped. Since the inertial force of the mortar 6 discharged from the injection pump 10 depends on the velocity v of the mortar 6, the inertial discharge predicted amount Q2 is expressed by a function formula (2) with the velocity v as a variable. Q2=f(v) (2) Equation (2) may be a linear function of the velocity v, or a quadratic function of the velocity v. The CPU 31a reads out the function (2) from the storage unit 31m, and calculates the inertial discharge predicted amount Q2 by applying the measured value of the flow velocity v to the function (2). The predicted inertial discharge amount Q2 is, for example, about several percent to several tens of percent of the required filling amount Q0.

[0042] <Modification 1 of Inertial Discharge Prediction Calculation> The inertial discharge predicted amount Q2 may be set according to the length L19 of the injection tube 19. As the injection tube length L19 increases, the flow resistance increases, and therefore the inertial discharge predicted amount Q2 decreases. The length L19 of the injection tube is input in advance by the setting unit 33. The input value of the injection pipe length L19 is stored in the memory unit 31m. In the inertial discharge predicted amount calculation step, the CPU 31a reads the value of the injection pipe length L19 from the memory unit 31m and calculates the inertial discharge predicted amount Q2. The predicted inertial discharge amount Q2 may be calculated from the velocity v and the injection pipe length L19. The function (2) may include the velocity v and the injection pipe length L19 as variables.

[0043] <Modification 2 of Inertial Discharge Prediction Calculation> The inertial discharge predicted amount Q2 may be set according to the elevation difference ΔH between the injection pump 10 and the rock bolt hole 5. When the rock bolt hole 5 is located at a higher position than the injection pump 10, the larger the elevation difference ΔH, the smaller the inertial discharge predicted amount Q2. The height difference ΔH is input in advance by the setting unit 33. Strictly speaking, the height difference ΔH from the discharge port 11p of the injection pump 10 to the proximal opening 5a of the lock bolt hole 5 is input. The input value of the elevation difference ΔH is stored in the memory unit 31m. In the inertial discharge predicted amount calculation step, the CPU 31a reads out the value of the elevation difference ΔH from the storage unit 31m and calculates the inertial discharge predicted amount Q2.

[0044] The predicted inertial discharge amount Q2 may be calculated from the velocity v or the injection pipe length L19 and the elevation difference ΔH. The function (2) may include the velocity v or the injection pipe length L19 and the elevation difference ΔH as variables. The predicted inertial discharge amount Q2 may be calculated from the velocity v, the injection pipe length L19, and the elevation difference ΔH. The function (2) may include the velocity v, the injection pipe length L19, and the elevation difference ΔH as variables. The inertial discharge predicted amount calculation step may be performed at the start or early stage of the injection step, or may be performed after the injection has progressed to a certain extent (for example, about 1 / 2 to 2 / 3 of the required filling amount Q0).

[0045] <Injection pump stop timing determination process> Furthermore, the processing unit 41 (determination unit) calculates the pre-filling injection amount Q1 by subtracting the inertial discharge predicted amount Q2 from the required filling amount Q0. Q1=Q0-Q2 (3) Then, it is determined whether the measured injection amount Q has reached the pre-filling injection amount Q1.

[0046] <Alarm process (injection pump stop instruction process)> When it is determined that the measured injection amount Q has reached the pre-filling injection amount Q1 (Q≧Q1), the processing unit 31 outputs an all-on command to the indicator lamp 40 via the signal conversion unit 32. This causes all three light-emitting units 41, 42, 43 to be lit. That is, the indicator lamp 40 emits light to issue a warning to stop the injection pump 10. In addition, an alarm sound is generated from buzzer 45 to instruct injection pump 10 to stop.

[0047] <Injection pump stop process> In response to this, operator A operates on / off switch 13 of injection pump 10 to stop the operation. This stops the supply of drive power to injection pump 10, and injection pump 10 stops operating.

[0048] <Modification of the injection pump stopping process> Instead of manual stopping by operator A, the processing unit 31 (output unit) may output an automatic stop command signal to the injection pump 10 via the signal conversion unit 32, and the injection pump 10 may be automatically stopped in response to that command signal.

[0049] <Inertial discharge process> During the inertial discharge time after the injection pump 10 is stopped, the mortar 6 continues to be discharged from the tip of the injection pipe 19 due to inertia. Even after the injection pump 10 is stopped, the worker B keeps the tip of the injection pipe 19 inserted into the rock bolt hole 5 during the inertial discharge time. This causes the mortar 6 discharged by inertia to be injected into the rock bolt hole 5. This prevents the mortar 6 discharged by inertia from being wasted outside the rock bolt hole 5. The inertial ejection time is, for example, about several seconds to several tens of seconds, and preferably about 2 seconds to 5 seconds.

[0050] The actual discharge amount Q3 of the mortar 6 due to inertia after the injection pump is stopped is approximated to the predicted inertial discharge amount Q2 calculated by the formula (2). Q3≒Q2 (4) The total actual discharge amount Qt after the inertial discharge time has elapsed is equal to the pre-filling injection amount Q1 plus the inertial actual discharge amount Q3. Qt = Q1 + Q3 (5) Therefore, from equations (3) to (5), the total actual discharge amount Qt approximates the required filling amount Q0. Qt≒Q0 (6) In this manner, the required amount of mortar 6 can be filled into the rock bolt hole 5.

[0051] <Continued flow measurement process> Even after the injection pump 10 is stopped (the supply of driving power is stopped), the supply of power to the flowmeter 20 continues at least until the inertial discharge time has elapsed. Then, the flowmeter 20 continues to measure the mortar flow rate until the inertial discharge time has elapsed. This makes it possible to reduce the difference between the final integrated injection amount Qe after the inertial discharge time has elapsed, as measured by the flowmeter 20, and the total actual discharge amount Qt.

[0052] The processing unit 31 stores the final integrated injection amount Qe (≈Qt) in the memory unit 31m as the total injection amount into the rock bolt hole 5, and resets the integrated injection amount. The stored data such as the injection amount is used to create reports such as daily work reports.

[0053] Worker B pulls out the injection pipe 19 from the proximal opening 5a of the rock bolt hole 5 which has already been filled with mortar. Next, the drill jumbo 4 is operated to drive the rock bolt 3 into the rock bolt hole 5 which has already been filled with mortar. In this manner, each drilled rock bolt hole 5 is filled with mortar 6 and then a rock bolt 3 is driven into the hole.

[0054] The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the present invention is not limited to tunnel construction, but can also be applied to slope construction, etc., as long as it is a method for injecting a filler into a rock bolt hole formed in the natural ground. In other words, the present invention can also be applied to the process of injecting a filler into a rock bolt hole in a slope when driving a rock bolt into the slope. The alarm unit may be configured with only one of the indicator light 40 and the buzzer 45, and the other may be omitted. The alarm unit may include a monitor that displays the degree of injection and thereby issues an alarm for the timing to stop injection. The filler injection system of the present invention is not limited to a pre-injection method in which mortar is injected into the rock bolt hole 5 and then the rock bolt 3 is inserted, but can also be applied to a post-injection method in which mortar is injected after the rock bolt 3 is inserted into the rock bolt hole 5. The filler is not limited to mortar, but may be a foamed resin such as a urethane type. [Industrial Applicability]

[0055] The present invention is applicable to rock bolting work in mountain tunnels, for example. [Explanation of symbols]

[0056] 1 Mountain Tunnel 2. Ground 3. Rock Bolt 5 Rock bolt hole 5a Hand side opening 6 Mortar (filler) 9. Filler injection system 10 Infusion pump 13 On / Off Switch 19 Injection tube 20 Flow meter 21 Current meter 30 Control Panel 31 Processing unit (judgment unit, calculation unit, output unit) 33 Setting section 40 Indicator light (alarm unit) 41, 42, 43 Light emitting part 45 Buzzer (alarm unit)

Claims

1. A system for injecting a filler into a rock bolt hole formed in a natural ground, comprising: An injection pump that discharges the filler; an injection pipe extending from the injection pump and inserted into the rock bolt hole; A flow meter that measures the discharge flow rate of the filler; a determination unit that determines whether an injection amount of the filler into the rock bolt hole based on a flow rate measured by the flow meter has reached a pre-filling injection amount obtained by subtracting a predicted inertial discharge amount of the filler during an inertial discharge time after the injection pump is stopped from a required filling amount of the rock bolt hole; a stop instruction unit that instructs the injection pump to stop in response to the determination; A filler injection system comprising:

2. A flow meter that measures the flow velocity of the discharged filler; A calculation unit that calculates the inertial discharge predicted amount based on the flow velocity measured by the flow meter; The filler injection system of claim 1 further comprising:

3. The filler injection system according to claim 1 or 2, wherein the stop instruction unit includes an alarm unit for issuing an alarm for the stop.

4. 3. The filler injection system according to claim 1, wherein the stop instruction unit includes an output unit for outputting a command signal for automatically stopping the injection pump.

5. A method for injecting a filler into a rock bolt hole formed in natural ground by an injection pump, comprising: a step of inserting an injection pipe extending from the injection pump into the rock bolt hole to perform the injection; Measuring the discharge flow rate of the filler with a flow meter; a step of issuing an instruction to stop the injection pump when the injection amount of the filler into the rock bolt hole based on the flow rate measured by the flow meter reaches a pre-filling injection amount obtained by subtracting a predicted inertial discharge amount of the filler during an inertial discharge time after the injection pump is stopped from a required filling amount of the rock bolt hole; thereafter, waiting for the inertial discharge time to elapse and then withdrawing the injection pipe from the rock bolt hole; A filler injection method comprising:

6. Measuring the discharge flow rate of the filler with a flow rate meter; calculating the predicted inertial discharge amount based on the flow velocity measured by the flow meter; The method of claim 5 further comprising:

7. The method for injecting a filler material according to claim 5 , wherein the predicted inertial discharge amount is set according to the length of the injection tube.

8. The filler injection method according to claim 5 , wherein the predicted inertial discharge amount is set according to a height difference between the injection pump and the rock bolt hole.

Images