Power supply system for backfilling device and backfilling device

Abstract

To provide a power supply system for backfilling device capable of safely carrying out backfilling operations even in places with inadequate ventilation, such as inside tunnels.SOLUTION: A power supply system 22 for a backfilling device is a power supply system 22 provided in a backfilling device 26 for mixing liquid A containing a polyol compound and a foaming agent and liquid B containing an isocyanate compound and injecting the mixture into a cavity 14 between concrete 12a of a narrow tunnel 10 and ground 12, and supplies power to a liquid A feeding pump for the liquid A and a liquid B feeding pump for the liquid B, respectively. It comprises a battery unit 22a, in which a plurality of batteries are connected in series and / or parallel to output a DC current of a predetermined voltage value and current value to match the drive power of each of the feeding pumps, and an inverter 22c that converts the DC current supplied from the battery unit 22a into AC current to match the respective ratings of the liquid A feeding pump and the liquid B feeding pump.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply system for a backfilling device that injects a urethane raw material solution into a cavity between a concrete member and the ground, and to a backfilling device. [Background technology]

[0002] In existing tunnels, cavities may occur between the tunnel lining concrete and the natural ground. In addition, cavities may occur between the concrete foundation and the ground under the concrete foundation of a building due to subsidence caused by a decrease in groundwater.

[0003] If these cavities are left unattended, the ground may collapse, causing cracks in the tunnel's concrete lining, or the concrete foundation may no longer be able to support the structure, causing it to tilt, which could prevent the safe use of the tunnel or structure. For this reason, backfill injection work is carried out in which a urethane raw material solution is injected into such cavities and foamed to fill the cavity with foamed polyurethane, ensuring the safety of the tunnel or structure.

[0004] When this backfill injection work is carried out in a road tunnel, a storage tank in which a urethane raw material solution is stored and a liquid delivery pump are mounted on the bed of a truck as described in the following Patent Document 1. An electric pump is usually used as this liquid delivery pump, and an oil-driven generator that supplies driving power to the pump is mounted on the bed of the truck together with the storage tank and the liquid delivery pump. In such road tunnel backfill injection work, the storage tank, the liquid delivery pump and the generator are usually mounted on the bed of a medium-sized truck, a so-called 4-ton truck (maximum load capacity 6.5 t or less, total length 12 m or less, total width 2.5 m or less, total height 3.8 m or less).

[0005] However, in tunnel backfill injection work, even in road tunnels, if ventilation inside the tunnel is insufficient, operating an oil-powered generator for a long period of time may have adverse effects on workers due to exhaust gas. Similarly, in backfill injection work for concrete foundations, operating an oil-powered generator in a room with insufficient ventilation may have adverse effects on workers due to exhaust gas. Backfill injection work is also required in narrow tunnels such as agricultural water tunnels, which are too narrow for 4-ton trucks to enter. If oil-powered generators are used in narrow tunnels, where ventilation is more likely to be insufficient than in road tunnels, there is a risk that exhaust fumes will have an adverse effect on workers even if the generator is operated for a short period of time. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6360922 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a power supply system for a backfilling device and a backfilling device that can safely carry out backfilling work even in tunnels or indoor locations where ventilation is insufficient. [Means for solving the problem]

[0008] The power supply system for a backfilling device devised to achieve the above-mentioned object is a power supply system that is installed in a backfilling device that mixes liquid A, which contains a polyol compound and a foaming agent as a urethane raw material solution, and liquid B, which contains an isocyanate compound, and injects the mixture into a cavity between a concrete member and the ground, and supplies power to each of an A liquid delivery pump that delivers said liquid A and a B liquid delivery pump that delivers said liquid B, and is characterized in that it is provided with a power source in which a plurality of batteries are connected in series and / or parallel to match the driving power of each of the liquid delivery pumps, and which outputs DC current of a predetermined voltage and current value, and an inverter that converts the DC current supplied from the power source into AC current so as to match the respective ratings of the A liquid delivery pump and the B liquid delivery pump.

[0009] It is preferable that the power supply is provided with a voltmeter for each of the batteries, and a voltage monitoring unit that issues an alarm to advise replacing all of the plurality of batteries with fully charged batteries when the voltage of the voltmeter for any of the batteries reaches a preset lower limit, thereby making it possible to confirm that it is time to replace the batteries.

[0010] It is preferable that the voltage monitoring section is provided with a remaining charge monitor that displays the remaining charge of each of the batteries, so that the state of each battery can be grasped.

[0011] A charging device is provided to charge each of the plurality of batteries that have been replaced when the voltage on the voltmeter has reached the lower limit, and the charging device is provided with an indicator that notifies the user that charging of the battery is complete, thereby reliably preventing overcharging of the batteries, which is preferable.

[0012] The concrete member is the tunnel wall of a narrow tunnel which cannot be entered by medium-sized trucks with a maximum load capacity of 6.5 tons or less, and the power source and the inverter are mounted on the loading platform of a light four-wheel truck with a maximum load capacity of 350 kg or less which can enter the narrow tunnel, and a charging device and generator which charges the multiple used batteries removed from the loading platform of the light four-wheel truck are provided outside the narrow tunnel, which is preferable as it allows backfilling work to be carried out safely in narrow tunnels where ventilation is prone to be insufficient.

[0013] A battery unit consisting of a combination of multiple batteries that constitute the power source is formed into a single package, and a fixing jig for fixing the package is provided on the bed of the light four-wheel truck or on the bed and the package, which makes it possible to securely fix the battery unit to the bed of the light four-wheel truck, which is preferable.

[0014] The backfilling device made to achieve the above-mentioned object is characterized in that it is provided with a mixing injection nozzle that mixes an A liquid containing a polyol compound and a foaming agent with a B liquid containing an isocyanate compound and injects the mixture into a cavity between a concrete member and the ground, an A liquid delivery pump that delivers the A liquid from an A liquid storage tank to the A liquid inlet of the mixing injection nozzle, a B liquid delivery pump that delivers the B liquid from a B liquid storage tank to the B liquid inlet of the mixing injection nozzle, a power source in which a plurality of batteries are connected in series and / or parallel to output a DC current of a predetermined voltage value and current value so as to match the driving power of each of the A liquid delivery pump and the B liquid delivery pump, and an inverter that converts the DC current supplied from the power source into an AC current so as to match the respective ratings of the A liquid delivery pump and the B liquid delivery pump, and supplies the AC current to the A liquid delivery pump and the B liquid delivery pump.

[0015] It is preferable that the power supply be provided with a voltmeter for each of the batteries, and a voltage monitoring unit that issues an alarm to advise the user to replace all of the plurality of batteries with fully charged batteries when the voltage of the voltmeter for any of the batteries reaches a preset lower limit, so that it is possible to confirm that it is time to replace the batteries.

[0016] It is preferable that the voltage monitoring section is provided with a remaining charge monitor that displays the remaining charge of each of the batteries, so that the state of each battery can be grasped.

[0017] It is preferable to provide a charging device which charges each of the plurality of replaced batteries when the voltage of the voltmeter reaches the lower limit, and to provide the charging device with an indicator which notifies the user that charging of the battery is completed, in order to reliably prevent overcharging of the batteries.

[0018] It is preferable that the concrete member is the tunnel wall of a narrow tunnel which cannot be entered by a medium-sized truck with a maximum load capacity of 6.5 tons or less, the power source and the inverter are mounted on the loading platform of a light four-wheel truck with a maximum load capacity of 350 kg or less which can enter the narrow tunnel, and a charging device and generator which charges the multiple used batteries removed from the loading platform of the light four-wheel truck are provided outside the narrow tunnel, because this allows backfilling work to be carried out safely in narrow tunnels where ventilation is prone to be insufficient.

[0019] It is preferable that a battery unit consisting of a combination of multiple batteries that constitute the power source is formed into a single package, and that a fixing jig for fixing the package is provided on the bed of the light four-wheel truck or on the bed and the package, so that the battery unit can be reliably and easily attached and detached to the bed of the light four-wheel truck.

[0020] It is preferable that the A liquid storage tank, the B liquid storage tank, the A liquid delivery pump, and the B liquid delivery pump are mounted on the bed of a light four-wheel truck separate from the light four-wheel truck on which the power source and the inverter are mounted, because charging of the battery of the power source requires only the movement of the light four-wheel truck on which the power source and the inverter are mounted. Effect of the Invention

[0021] According to the power supply system for a backfilling device of the present invention, the driving power for the liquid delivery pumps that deliver each of liquid A containing a polyol compound and a foaming agent, and liquid B containing an isocyanate compound, is supplied from a battery via an inverter, so that even in places with insufficient ventilation where oil-powered generators cannot be used, such as narrow tunnels where a medium-sized truck (4-ton truck) with a maximum load capacity of 6.5 tons or less cannot enter, the backfilling work of mixing liquid A and liquid B and injecting them into the cavity between the concrete member and the ground to fill the cavity with foamed polyurethane can be safely carried out. [Brief description of the drawings]

[0022] [Figure 1] A partial cross-sectional view for explaining backfilling work using a power supply system for a backfilling device to which the present invention is applied. [Diagram 2] 2 is a schematic diagram illustrating the state in which the power supply system for the backfilling device shown in FIG. 1 is mounted on the bed of a light truck. [Diagram 3] 3 is a schematic diagram illustrating a battery unit that constitutes the power source of the power supply system for the backfilling device shown in FIG. 2. [Figure 4] 2 is an explanatory diagram illustrating an A liquid delivery pump that delivers A liquid from an A liquid storage tank of the backfilling device shown in FIG. 1 and a B liquid delivery pump that delivers B liquid from a B liquid storage tank. FIG. [Diagram 5] FIG. 2 is a schematic diagram illustrating a charging device that charges each battery of the battery unit. [Figure 6] FIG. 13 is an explanatory diagram illustrating another backfilling device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention will be described in detail below, but the scope of the present invention is not limited thereto.

[0024] Fig. 1 is an explanatory diagram of the backfilling work of a tunnel used for an agricultural waterway. The tunnel 10 in Fig. 1 is a narrow tunnel 10 (hereinafter simply referred to as narrow tunnel 10) that cannot be entered by medium-sized trucks, so-called 4-ton trucks (maximum load capacity 6.5t or less, total length 12m or less, total width 2.5m or less, total height 3.8m or less), and can only be entered by light four-wheel trucks (maximum load capacity 350kg or less, total length 3.4m or less, total width 1.48m or less, total height 2.0m or less). Even in such a narrow tunnel 10, a cavity 14 may be formed between the outer wall surface of the concrete 12a and the natural ground 12 due to groundwater, rainwater, etc. If this cavity 14 is left unattended, the natural ground 12 will collapse and crack the concrete 12a, causing water leakage from the narrow tunnel 10 or the narrow tunnel 10 may collapse.

[0025] Generally, narrow tunnels 10 used for agricultural irrigation channels are installed in remote locations and are often long. For this reason, if a storage tank for storing the urethane raw material solution, an electric liquid feed pump, and an oil-driven generator are mounted on the bed of a single truck to fill the cavity 14 with foamed polyurethane resin, as described above, the bed of the truck would require the space of a 4-ton truck. Moreover, if the oil-driven generator in the long, narrow tunnel 10 continues to supply driving power to the liquid feed pump, the exhaust gases may have a negative impact on workers.

[0026] In this regard, in the backfilling work shown in FIG. 1, two light four-wheel trucks 20, 24 capable of entering the narrow tunnel 10 are used, and a power supply system 22 for the backfilling device is mounted on the bed of the light four-wheel truck 20, and a liquid delivery device 26 for delivering each of liquid A containing a polyol compound and a foaming agent, and liquid B containing an isocyanate compound, is mounted on the bed of the other light four-wheel truck 24.

[0027] The power supply system 22 for the backfilling device is mounted on the bed of the light four-wheel truck 20 and is composed of a battery unit 22a as a power source composed of multiple batteries 23, a repeater 22b, and an inverter 22c as shown in Fig. 2. Each battery 23 in the battery unit 22a is rectangular, and packing 21 is arranged between the batteries 23 and on the back side of the battery 23. The front electrodes of each battery 23 are connected to the repeater 22b. In the repeater 22b, the multiple batteries 23 are connected in series and / or parallel to provide driving power for the liquid delivery device 26, and a DC current of a predetermined voltage and current value is output. Here, when the amount of electricity required to operate the liquid delivery device 26 continuously for three hours is 15 kWh, and when using a battery 23 that outputs a direct current of 24 V and a current of 100 Ah, six batteries 23 are connected in repeater 22b with two in series and three in parallel, as shown in Figure 2(b), and a direct current of 48 V is output from battery unit 22a. In this way, the DC current adjusted by the repeater 22b to be the driving power for the liquid delivery device 26 is adjusted by the inverter 22c to an AC current that matches the ratings of each of the devices constituting the liquid delivery device 26. The DC current of 48 V output from the battery unit 22a with the wiring shown in Fig. 2(b) is adjusted by the inverter 33c to an AC current of 200 V, 10 kVA, three-phase, three-wire. A voltmeter 25 is connected to the terminals of each battery 23 in the battery unit 22a, and voltage data from each voltmeter 25 is sent to a voltage monitoring unit 25a. The voltage monitoring unit 25a calculates the remaining charge of each battery 23 from the charge amount of each battery 23 input in advance and the voltage data from each voltmeter 25, and displays the calculated remaining charge on a remaining charge monitor 23b. When the remaining charge of any of the batteries 23 reaches a predetermined value, an alarm 23c is issued. An example of the battery 23 is a rechargeable lithium ion battery.

[0028] As shown in FIG. 1, the backfilling device power supply system 22 mounted on the bed of the light four-wheel truck 20 transmits driving power via a cable 28 to a liquid delivery device 26 mounted on the bed of the light four-wheel truck 24. As shown in FIG. 4, the liquid delivery device 26 is composed of an A liquid delivery pump 26A that delivers A liquid containing a polyol compound and a foaming agent stored in an A liquid storage tank 27a, a B liquid delivery pump 26B that delivers B liquid containing an isocyanate compound stored in a B liquid storage tank, and a control unit 26C that controls the A liquid delivery pump 26A and the B liquid delivery pump 26B. The A liquid delivery pump 26A and the B liquid delivery pump 26B are driven by driving power transmitted from the device power supply system 22 via the cable 28. The cable 28 is composed of a cable 28a connected to the A liquid delivery pump 26A and a cable 28b connected to the B liquid delivery pump 26B. The rotation speed and the like of the A liquid delivery pump 26A and the B liquid delivery pump 26B are controlled by a control unit 26C, and the amount of each liquid delivered to the A liquid pipe 29a and the B liquid pipe 29b is controlled.

[0029] The light four-wheel trucks 20, 24 are positioned near the backfilling work site in the narrow tunnel 10 as shown in Fig. 1, and the backfilling work is carried out. In the backfilling work, first, the tip of the mixing injection nozzle 32, which mixes A liquid and B liquid and injects it into the cavity 14, is inserted into the cavity 14 through one of the multiple drilling holes 12b in the concrete 12a of the narrow tunnel 10. The tip of the mixing injection nozzle 32 is fixed in the drilling hole 12b into which the tip is inserted with an adhesive or a drop prevention ring attached to the tip, inserted into the cavity 14, and hung on the opening on the back side of the concrete 12a of the drilling hole 12b, and further, a seal such as a rag or caulking agent is filled in the gap between the tip and the drilling hole 12b to close the gap so that the mixed liquid of A liquid and B liquid injected into the cavity 14 does not leak.

[0030] The A liquid piping 29a from the A liquid delivery pump 26A and the B liquid piping 29b from the B liquid delivery pump 26B of the liquid delivery device 26 mounted on the bed of the light four-wheel truck 24 are connected to a predetermined connection port of the mixing and injection nozzle 32 with the tip portion inserted into the cavity 14 in this manner. Furthermore, the backfilling device power supply system 22 mounted on the bed of the light four-wheel truck 20 is connected to the A liquid delivery pump 26A of the liquid delivery device 26 mounted on the bed of the light four-wheel truck 24 by a cable 28a, and is also connected to the B liquid delivery pump 26B by a cable 28b.

[0031] Next, the A liquid delivery pump 26A and the B liquid delivery pump 26B of the liquid delivery device 26 are driven by the driving power supplied from the power supply system 22 for the backfilling device, and the rotation speed of the A liquid delivery pump 26A and the B liquid delivery pump 26B are adjusted by the control unit 26C to deliver the A liquid and the B liquid at a predetermined ratio. The mixed liquid of the A liquid and the B liquid injected into the cavity 14 from the tip of the mixing injection nozzle 32 foams and becomes foamed polyurethane, filling the cavity 14. When a predetermined amount of each of the A liquid and the B liquid is injected, the A liquid delivery pump 26A and the B liquid delivery pump 26B are stopped to end the injection work. Furthermore, the tip of the mixing injection nozzle 32 is inserted into the adjacent drilled hole 12b to carry out the same injection work, and when the injection work is completed in all the drilled holes 12b, the backfilling work is completed.

[0032] Examples of the polyol compound of the A liquid stored in the A liquid storage tank 27a include polyol compounds obtained by reacting one or more selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, trimethylolpropane, 1,2,6-hexanetriol, sorbitol, and sucrose with ethylene oxide, propylene oxide, and / or butylene oxide, and subjecting them to a polyaddition reaction. Examples of the blowing agent contained together with the polyol compound include water; hydrofluoroolefins such as trichloromonofluoromethane, trichlorotrifluoroethane, CHF3, CH2F2, CH3F, and trans-1-chloro-3,3,3-trifluoropropene; and hydrochlorofluorocarbon compounds such as dichloromonofluoroethane, chlorodifluoromethane, 1-chloro-1,1-difluoroethane, 1,1,1,3,3-pentafluoropropane, and 1,1,1,3,3-pentafluorobutane.

[0033] Solution A may contain a curing agent that accelerates the curing of the polyurethane foam and a filler that enhances its strength. Specific examples of such curing agents include amine catalysts such as triethylamine, triethanolamine, diethanolamine, triethylenediamine, and tetramethylhexamethylenediamine, and / or organometallic catalysts such as dibutyltin dilaurate. A preferred filler is colloidal silica.

[0034] Examples of the isocyanate compound in the liquid B stored in the liquid B storage tank 27b include polymethylene polyphenyl isocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, and / or isophorone diisocyanate.

[0035] When the remaining charge of any of the batteries 23 of the battery unit 22a reaches a predetermined value during the backfilling operation and the alarm 23c is activated, it is preferable to immediately replace it with a spare battery unit 22a. In order to quickly replace the battery unit 22a, the battery unit 22a is housed in a body made of an insulating material such as plastic to form one package, and a fixing jig for fixing the package to the bed of the light four-wheel truck 20 or the package is provided, so that the package can be reliably and easily attached and detached from the bed. As the fixing jig, a truck fixing belt, a cargo tie-down belt, or the like can be suitably used.

[0036] The battery unit 22a that has been replaced when the remaining charge of any of the batteries 23 reaches a lower limit and an alarm 23c is issued by the voltage monitoring unit 23a shown in Fig. 3 can be charged by a charging device 34 installed outside the narrow tunnel 10 as shown in Fig. 1. This charging device 34 has a petrol-driven generator, but since it is installed outside the narrow tunnel 10, the narrow tunnel 10 is not affected by exhaust gas from the generator. Fig. 5 shows the battery unit 22a that is charged by the charging device 34. The electricity generated by the generator 34a is charged into each battery 23 of the battery unit 22a from each of a plurality of outlets 34c installed in the distributor 34b. The voltage data of the voltmeter 25 installed in each battery 23 is transmitted to the charging monitoring unit 36, which monitors the charging state of each battery 23, and displays the charging completion indicator 38 when charging is completed.

[0037] As the mixing injection nozzle 32 for mixing the liquid A and the liquid B sent from the liquid sending device 26 and injecting the mixture into the cavity 14, a nozzle to which only the liquid A and the liquid B are supplied is illustrated in FIG. 1, but a mixing injection nozzle 40 shown in FIG. 6 can be used. The mixing injection nozzle 40 is provided with a liquid A nozzle 45 extending upward from an inlet 40a of the liquid A provided at the bottom. An inlet 40b of the liquid B is provided above the upper end of the liquid A nozzle 45. An inlet 44 of compressed air sent from an air compressor 42 is provided near the middle between the inlet 40a of the liquid A and the inlet 40b of the liquid B, and near the middle of the liquid A nozzle 45.

[0038] According to the liquid delivery device 26 having the mixing injection nozzle 40 shown in FIG. 6, the liquid A containing a polyol compound and a foaming agent and the compressed air collide and mix before reaching the tip of the liquid A nozzle 45, and the liquid A contains a large amount of granular air. The liquid A containing air joins with the liquid B containing an isocyanate compound near the tip of the liquid A nozzle 45, and the two are mixed and stirred. As a result, a foamed polyurethane raw material liquid containing a large amount of air is prepared. Therefore, the foamed polyurethane generated from this foamed polyurethane raw material liquid has a high foaming ratio. As a result, a smaller amount of foamed polyurethane raw material liquid is required to fill the cavity 14 without any gaps than in the past, which is economical. Furthermore, the driving power for the air compressor 42 is supplied from a power supply system 22 for the backfilling device mounted on the bed of the light four-wheel truck 20, thereby maintaining a good environment at the backfilling work site inside the narrow tunnel 10.

[0039] In the above-described backfilling work in the narrow tunnel 10, two light four-wheel trucks were used, but if the backfilling device 26 and its power supply system 22 can be mounted on the bed of one light four-wheel truck, one light four-wheel truck may be used. The light four-wheel truck may be an electric vehicle. Also, in large tunnels such as road tunnels that medium-sized trucks can enter, in places where ventilation is insufficient inside the tunnel, or in backfilling work in places where ventilation is insufficient, such as backfilling work for the concrete foundation of an underground parking lot, as shown in Fig. 1, a power supply system 22 for the backfilling device can be mounted on the bed of a light four-wheel truck 20 and a driving power can be supplied to the liquid delivery device 26, thereby maintaining a good environment at the backfilling work site. In this case, the backfilling device 26 and its power supply system 22 may also be mounted on the bed of a single medium-sized truck. Furthermore, even when backfilling work is carried out in tunnels or buildings with good ventilation, the environment at the backfilling work site can be further improved by supplying driving power to the liquid delivery device 26 from the power supply system 22 for the backfilling device. [Industrial Applicability]

[0040] The present invention may be used to seal cavities under building foundations and cavities formed by defects in building structures, as well as adits such as abandoned mines, waterways, bomb shelters, and lifeline pits. [Explanation of symbols]

[0041] 10: narrow tunnel, 12: natural ground, 12a: concrete, 12b: drilling hole, 14: cavity, 20, 24: light four-wheel truck, 21: packing, 22: power supply system for backfilling device, 22a: battery unit, 22b: repeater, 22c: inverter, 23: battery, 25: voltmeter, 25a: voltage monitoring unit, 23b: remaining amount monitor, 23c: alarm, 26: liquid delivery device, 26A: A liquid delivery pump, 26B : B liquid delivery pump, 26C: control unit, 27a: A liquid storage tank, 27b: B liquid storage tank, 28, 28a, 28b: cable, 29a: A liquid piping, 29b: B liquid piping, 32, 40: mixing injection nozzle, 34: charging device, 34a: generator, 34b: power distributor, 34c: outlet, 36: charging monitor, 38: charging completion indicator, 40a, 40b, 44: inlet, 42: air compressor, 45: A liquid nozzle

Claims

1. A power supply system is provided in a backfilling device that mixes an A liquid containing a polyol compound and a foaming agent as a urethane raw material solution with a B liquid containing an isocyanate compound and injects the mixture into a cavity between a concrete member and the ground, and supplies power to each of an A liquid delivery pump that delivers the A liquid and a B liquid delivery pump that delivers the B liquid, a power source in which a plurality of batteries are connected in series and / or parallel to each other so as to match the driving power of each of the liquid delivery pumps, and which outputs a direct current of a predetermined voltage value and current value; A power supply system for a backfilling device, characterized in that it is provided with an inverter that converts the direct current supplied from the power source into an alternating current so as to conform to the ratings of each of the A liquid delivery pump and the B liquid delivery pump.

2. The power supply system for a backfilling device as described in claim 1, characterized in that the power supply is provided with a voltmeter for each of the batteries, and a voltage monitoring unit that issues an alarm to request that all of the multiple batteries be replaced with fully charged batteries when the voltage of the voltmeter for any of the batteries reaches a predetermined lower limit value.

3. 3. The power supply system for a backfilling device according to claim 2, wherein the voltage monitoring unit is provided with a remaining charge monitor that displays the remaining charge of each of the batteries.

4. The power supply system for a backfilling device as described in claim 2, further comprising a charging device for charging each of the plurality of batteries that have been replaced when the voltage of the voltmeter has reached the lower limit value, and the charging device is provided with an indicator for notifying the completion of filling when charging of the battery is completed.

5. The concrete member is a tunnel wall portion of a narrow tunnel in which a medium-sized truck with a maximum load of 6.5 tons or less cannot enter, The power source and the inverter are mounted on a bed of a light four-wheel truck having a maximum load capacity of 350 kg or less that can enter the narrow tunnel, The power supply system for a backfilling device as described in claim 1, characterized in that a charging device and generator for charging the multiple used batteries removed from the bed of the light four-wheel truck are provided outside the narrow tunnel.

6. The power supply system for a backfilling device as described in claim 5, characterized in that a battery unit consisting of a combination of multiple batteries that constitute the power source is formed into a single package, and a fixing jig for fixing the package is provided on the bed of the light four-wheel truck or on the bed and the package.

7. a mixing and injection nozzle for mixing a liquid A containing a polyol compound and a foaming agent with a liquid B containing an isocyanate compound and injecting the mixture into a cavity between a concrete member and the ground; a liquid A delivery pump that delivers the liquid A in the liquid A storage tank to the liquid A inlet of the mixing and injection nozzle; a liquid B delivery pump that delivers the liquid B from the liquid B storage tank to the liquid B inlet of the mixing and injection nozzle; a power supply in which a plurality of batteries are connected in series and / or in parallel to output a direct current of a predetermined voltage value and current value so as to match the driving power of each of the A liquid delivery pump and the B liquid delivery pump; A backfilling device characterized in that it is provided with an inverter that converts the direct current supplied from the power source into an alternating current that is compatible with the respective ratings of the A liquid delivery pump and the B liquid delivery pump, and supplies the alternating current to the A liquid delivery pump and the B liquid delivery pump.

8. The backfilling device described in claim 7, characterized in that the power supply is provided with a voltmeter installed in each of the batteries, and a voltage monitoring unit that issues an alarm to request that all of the multiple batteries be replaced with fully charged batteries when the voltage of the voltmeter of any of the batteries reaches a predetermined lower limit value.

9. 9. The backfilling device according to claim 8, wherein the voltage monitoring unit is provided with a remaining capacity monitor that displays the remaining capacity of each of the batteries.

10. The backfilling device described in claim 8, characterized in that a charging device is provided for charging each of the plurality of batteries that have been replaced when the voltage of the voltmeter has reached the lower limit value, and the charging device is provided with an indicator for notifying the completion of filling when charging of the battery is completed.

11. The concrete member is a tunnel wall portion of a narrow tunnel in which a medium-sized truck with a maximum load of 6.5 tons or less cannot enter, The power source and the inverter are mounted on a bed of a light four-wheel truck having a maximum load capacity of 350 kg or less that can enter the narrow tunnel, The backfilling device according to claim 7, characterized in that a charging device and a generator for charging the multiple used batteries removed from the bed of the light four-wheel truck are provided outside the narrow tunnel.

12. The backfilling device described in claim 11, characterized in that a battery unit consisting of a combination of multiple batteries that constitute the power source is formed into a single package, and a fixing jig for fixing the package is provided on the bed of the light four-wheel truck or on the bed and the package.

13. The backfilling device described in claim 11, characterized in that the A liquid storage tank, the B liquid storage tank, the A liquid delivery pump and the B liquid delivery pump are mounted on the bed of a light four-wheel truck other than the light four-wheel truck in which the power source and the inverter are mounted.

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