JP2004162266A - Equipment for injecting urethan chemical solution for stabilizing and reinforcing ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment for injecting a urethane chemical solution for stabilizing and reinforcing ground for excavation of a tunnel, which can enhance working efficiency. <P>SOLUTION: This equipment for injecting the urethane chemical solution for stabilizing and reinforcing the ground comprises an injection pump, a main tank for storing the urethan chemical solution, and a sub-tank for storing the urethan chemical solution; the sub-tank is piping-connected to the main tank; and the main tank is piping-connected to the injection pump. Otherwise, the main tank of the equipment is piping-connected to the injection pump, and the sub-tank thereof is piping-connected to the injection pump without the medium of the main tank. Preferably, the capacity of the main tank is set at 500 liters or more, and the capacity of the sub-tank is set at 300 liters or less. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chemical liquid injector for solidifying and reinforcing ground or the like in tunnel excavation work.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in excavation work for tunnels and the like, a urethane chemical liquid injection method has been known as a method for consolidating and reinforcing ground such as ground. In this method, as shown in FIG. 2, a liquid A container 12 and a liquid B container 13 having a capacity of about 50 to 200 liters connected by pipes to injection pumps P11 and P12 are used. In the tunnel pit, a worker manually inputs the urethane resin A liquid into the A liquid container 12 and the urethane resin B liquid into the B liquid container 13 from the 18-liter oil cans 14 and 15. A curing agent, a water glass solution, fine powder, a reinforcing agent, and the like can be added to the A liquid container 12. The injection pump is driven to send the chemicals in the A-liquid container 12 and the B-liquid container 13, and the mixed chemicals are injected through a mixer into the ground or the like via bolts, etc. Penetrates inside and strengthens consolidation. Such a urethane drug solution injection method is disclosed in, for example, Patent Document 1.
[0003]
In this conventional chemical liquid injection method, an empty 18-liter oil can after transferring a urethane chemical liquid to a container connected to an injection pump is treated as scrap iron or industrial waste. For this purpose, empty can collection work and inspection work for confirming the quantity used are complicated, and the disposal cost of empty cans is also high. Therefore, check the quantity of chemicals to be delivered, load the injection equipment and chemicals on the truck, move them into the mine and carry out the injection work, move the equipment and empty cans after the injection work and move them out of the mine, A comprehensive improvement was required for a series of urethane chemical injection systems, including the use quantity inspection work and the disposal of chemical waste cans after use.
[0004]
Conventionally, a commercially available 18 liter petroleum can is used as a packaging material for the urethane chemical solution, and a metal container having a capacity of about 50 to 200 liters connected and connected to an infusion pump (in the example of FIG. 12 and the B liquid container 13), and the injection operation is being carried out. At the time of the injection operation, a worker in the tunnel pit opens a 18-liter oil can and lifts up the required quantity of urethane chemical liquid, and drops it by its own weight. The urethane solution was transferred to a metal container having a capacity of about 50 to 200 liters one by one. The injection amount varies depending on conditions such as the scale of the tunnel and the soil quality of the ground, but usually about 0.75 to 1.5 tons are used per injection work, and when more than 2 tons are used at a time. The transfer of urethane chemicals was very hard work. Further, a work process is required to transfer the urethane chemicals one by one from a 18 liter oil can to a metal container having a capacity of about 50 to 200 liters, and the urethane chemicals may spill or splash during the opening and transfer work. Therefore, there is a possibility that the underground facilities may be contaminated with urethane chemicals or the chemicals may adhere to underground workers, and improvement in hygiene and working environment is required.
[0005]
Further, conventionally, during the injection operation, the urethane chemical was put into a container having a simple lid (in the example of FIG. 2, the liquid A container 12 and the liquid B container 13). Therefore, there is no danger of deterioration because nitrogen gas is sealed when filling the cans with chemicals at the manufacturing plant before opening, but there is no danger of deterioration, but after opening, the moisture in the atmosphere or the cement used for construction There is a concern that the quality of the urethane chemical solution may be degraded by being constantly exposed to dust and the like and coming into contact with and mixing with the dust.
[0006]
For example, Patent Document 2 discloses a method in which a chemical liquid is sealed in a portable container made of a synthetic resin in a factory or the like to form a container, and the container is brought into an on-site plant to inject the chemical liquid. In Patent Literature 2, 1800 liters of a chemical solution is put into a portable container made of synthetic resin to form a container, which is brought into a site plant, attached to an injection tank, and injected into the ground using compressed air. In addition, a method is disclosed in which two sets of a portable container and an injection tank are prepared, and the liquid medicine is continuously injected without stopping the operation.
[0007]
However, in this method, since a large-capacity container is used as a container for the chemical solution, the content of the chemical solution is transferred during the transfer of the chemical solution from the portable container to the injection tank, during the injection operation of the chemical solution, and during storage. Since it is difficult to visually grasp or lift the liquid, it is not possible to easily confirm the amount of the chemical in the portable container or the injection tank, and thus a problem has occurred in the liquid amount management.
[0008]
In addition, chemicals are sealed in portable containers at factories and brought to the on-site plant, so if a small amount of chemicals is insufficient during injection work, it is necessary to bring another portable container from the factory, Quick and flexible response was not possible.
[0009]
Furthermore, factories and warehouses generally use forklifts to move pallets loaded with containers, drums, oil cans, etc., but usually work on areas where the ground is not level at tunnel construction sites. Forklifts cannot be used because of the necessity, and they are lifted and moved by cranes. Generally, large-capacity containers (portable containers) on the market are manufactured on the assumption that they can be moved by a forklift, so they cannot be moved and cannot be used at a tunnel construction site.
[0010]
By the way, since the working space inside the tunnel pit is usually small, it is necessary to make the space for the injection work equipment and urethane chemical solution as compact as possible.Before and after the injection work, perform other construction work and move heavy machinery and trucks. It is required to be able to move quickly so as not to disturb. Furthermore, it is desired that the time required for the injection work process be reduced as much as possible, and that the progress of the entire tunnel excavation work be made more efficient. However, in the conventional method of transferring oil from a can in a tunnel pit, labor, space and time are required to transfer urethane chemicals manually and to clear empty cans after use and to perform inspection work to check the quantity of chemicals used. Required, which hindered the efficiency of the entire construction.
[0011]
Therefore, an apparatus having a transport mechanism has been developed so that the apparatus can be quickly moved into and out of the tunnel mine. For example, the apparatus disclosed in Patent Literature 3 has an underground production unit that moves inside and outside a tunnel by a transport mechanism, and manufactures a powder material and a liquid material produced by an outside production unit outside the tunnel underground. Are accommodated in the powder material storage section and the liquid material storage section, and move into the tunnel pit. Then, a powder material and a liquid material are mixed in a tunnel pit to produce a grout material, and the grout material is filled into a tunnel wall by a pressure pump. However, this equipment requires that large and complex manufacturing equipment for producing powdery and liquid materials be installed outside the pit, and that equipment for mixing powder and liquid is used inside the pit. It requires a lot of cost for the equipment, and requires a lot of work steps, so there is a problem in terms of process management and work efficiency.
[0012]
[Patent Document 1]
JP-A-5-5394
[Patent Document 2]
JP-A-54-82807
[Patent Document 3]
JP 2001-32698 A
[0013]
[Problems to be solved by the invention]
An object of the present invention is to provide a urethane chemical injection device for enhancing ground stability for tunnel excavation, which can improve work efficiency.
[0014]
[Means for Solving the Problems]
The first device of the present invention relates to a urethane chemical injection device for injecting urethane chemical into the ground using an injection pump, comprising an injection pump, a main tank for storing urethane chemical, and a subtank for storing urethane chemical. And a sub tank is connected to a main tank by piping, and a main tank is connected to an injection pump by piping.
[0015]
Further, a second device of the present invention relates to a urethane liquid injector for injecting urethane liquid into the ground using an injection pump, an injection pump, a main tank for storing urethane liquid, and a subtank for storing urethane liquid. The main tank is connected to the injection pump by piping, and the sub-tank is connected to the injection pump by piping without passing through the main tank.
[0016]
A third device of the present invention relates to the first or second device, and relates to a urethane chemical liquid injection device for enhancing ground stability, wherein the capacity of a main tank is 500 liters or more and the capacity of a sub tank is 300 liters or less.
[0017]
A fourth device according to the present invention relates to the first, second, or third device, wherein the main tank is a metal pressure-resistant container, and dry gas or nitrogen gas can be sealed in a gas phase in the tank. And a device having a gas inlet and a safety valve, and capable of pressurizing and transferring a urethane chemical to a liquid feed pump by supplying dry air or nitrogen gas from the gas inlet.
[0018]
Further, the fifth device of the present invention relates to the first to fourth devices, wherein the main tank has a transparent or translucent looking tube connecting the upper portion of the main tank and the lower portion of the main tank. And a device capable of observing the urethane chemical amount in the main tank according to the urethane chemical surface level.
[0019]
Furthermore, a sixth device of the present invention relates to the first to fifth devices, wherein the main tank has a lifting hook.
[0020]
In addition, a seventh device of the present invention relates to the first to sixth devices and relates to a device in which an injection pump, a main tank, and a sub tank are mounted on a self-propelled vehicle.
[0021]
Further, an eighth device of the present invention relates to the first to seventh devices, further comprising a transport tank having a capacity of 500 liters or more for transferring a urethane chemical to the main tank, wherein the transport tank is a main tank. The present invention relates to a device that is detachably connected to a tank by piping.
[0022]
A ninth device according to the present invention relates to the eighth device, wherein transfer of the urethane chemical from the transport tank to the main tank is performed by pressurized transfer using dry air or nitrogen gas, transfer by a liquid feed pump, or chemical liquid own weight. , Or a device performed by a free-fall transfer or a combination thereof.
[0023]
A tenth device according to the present invention relates to the eighth or ninth device, wherein the transport tank is a metal pressure-resistant container, and dry air or nitrogen gas can be sealed in a gas phase in the tank. And a device having a gas inlet and a safety valve, and capable of transferring urethane chemicals to the main tank under pressure by supplying dry air or nitrogen gas from the gas inlet.
[0024]
An eleventh device according to the present invention relates to the eighth to tenth devices, wherein the transport tank comprises a lifting hook.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the urethane chemical liquid injection device of the present invention is connected to the injection pumps P1 and P2, the main tanks 3 and 4 connected to the injection pump by piping, and connected to the main tank and connected to the injection pump by piping. Sub tanks 5 and 6 are provided. As described above, since the urethane chemical is supplied from both the main tank and the sub-tank to the infusion pump, the liquid can be supplied from the sub-tank when the chemical in the main tank runs short. Before the injection operation, the main tank is provided with a detachable piping system so that the chemical solution can be transferred from the transport tanks 9 and 10 to the main tank through the piping.
[0026]
As the infusion pump, for example, a small gear pump or a piston pump driven by an electric motor is used.
[0027]
The main tank needs to be prepared as a container for the urethane chemical solution separately from the transport tank. If the transport tank is used as the main tank without transferring urethane chemicals, the tank may become dirty during injection work and underground movement, or dust and foreign matter such as moisture and cement may enter the tank. For this reason, there is a concern that the transport tank cannot be reused as a packaging material for transporting the urethane chemical solution.
[0028]
As the main tank, a commercially available liquid metal container can be used. If the urethane chemical is classified as a non-dangerous substance under the Fire Service Law, a commercially available container made of plastic can be used.
[0029]
As the capacity of the main tank, those having a capacity of 500 to 5000 liters, preferably 500 to 3000 liters, more preferably 500 to 1500 liters can be suitably used. When the volume is less than 500 liters, the content per unit is small, so the number of times the urethane chemical is transferred from the transport tank increases, and it takes time and effort, resulting in poor efficiency. If the capacity exceeds 5,000 liters, the mass of the container filled with the chemical solution increases, the volume also increases, and the mobility inside and outside the tunnel becomes poor.
[0030]
As the transport tank, a commercially available liquid metal container having a pressure resistance capable of transferring urethane chemicals under pressure by commonly used dry air or a compressed gas of a nitrogen gas cylinder is used. Can be used. If the urethane chemical is classified as a non-dangerous substance under the Fire Service Law, a commercially available container made of plastic can be used. However, in this case, since the pressure resistance performance is low, the method for transferring the urethane chemical from the transport tank to the main tank is to connect a detachable pipe so that pressurized transfer by dry air and nitrogen gas cannot be performed. It is preferable that the liquid is transferred through the pipe using a generally used liquid sending pump.
[0031]
As the capacity of the transport tank, those having a capacity of 500 to 5000 liters, preferably 500 to 3000 liters, more preferably 500 to 1500 liters can be suitably used. When the volume is less than 500 liters, the number of containers for transferring the urethane chemical to the main tank increases because the content per unit is small, and it takes time and effort, resulting in poor efficiency. If the capacity is more than 5000 liters, the container filled with the chemical solution becomes heavy, the volume also becomes large, and it is difficult to move and store the container.
[0032]
As the transport tank and the main tank, furthermore, the material is made of metal such as stainless steel, has a pressure resistance, an opening with a valve that can be opened and closed, a vent and a safety valve are installed, It is preferable to use a large-capacity container in which dry air or nitrogen gas can be filled and urethane chemicals can be transferred under pressure by using generally used dry air or compressed gas of a nitrogen gas cylinder. Here, having a pressure resistance means that no leakage or deformation occurs in a water pressure test of 20 kPa. When dry air or nitrogen gas is used for transfer under pressure, it is not necessary to consider deterioration of urethane chemicals, especially polyisocyanate components in the transfer tank and the main tank due to water contamination. Further, since the safety valve is mounted, even in the event that the pressure in the transport tank and the main tank is excessively applied, there is no fear that gas will escape from the safety valve and explode.
[0033]
Further, as shown in FIG. 1, it is preferable to attach three or more hook portions 7 to the transport tank and the main tank. By attaching the hooks at three or more places, for example, a wire can be used, and the mass can be stably lifted by a crane using a normal sling method, and the mass can be measured by a moving and hanging mass weighing device. As a result, the efficiency of the work of receiving the number of used chemicals can be improved.
[0034]
In general, when the urethane chemical main tank is made of metal and has a large capacity, the contents of the urethane chemical should be visually or lifted to grasp the contents when transferring the chemical from the transport tank to the main tank, and during injection work and storage. Since it is difficult to check the amount of the chemical in the main tank, it is difficult to control the amount of the liquid. Therefore, as shown in FIG. 1, an opening through which a chemical solution can pass is provided at the lower and upper portions of the main tank so that the urethane chemical volume in the metal main tank can be grasped. By using a tube made of a transparent material, a metal main tank in which a looking tube 8 is installed so that the liquid level in the tank substantially matches the liquid level in the tube can be used to easily check the amount of the chemical liquid in the main tank. And the amount of liquid can be controlled.
[0035]
As the sub-tank, tanks of various materials and shapes such as plastic, metal, rectangular parallelepiped and cylindrical can be applied.For example, the material is stainless steel, the shape is a rectangular parallelepiped, and the upper surface has a lid that can be opened and closed. A container having a drain port and a control valve at the bottom is used.
[0036]
Similar to the main tank or the transport tank, the sub tank may be a metal container having pressure resistance, and a valve for supplying dry air or nitrogen gas may be provided. By supplying dry air or nitrogen gas from the valve and pressurizing and transferring the urethane chemical to the main tank or oil supply pump, efficient transfer is possible, and moisture contamination in the urethane chemical is prevented. Can be. Further, if a safety valve is provided in the sub-tank, accidents due to damage or rupture of pumps, piping, tanks, etc. due to excessive pressure rise can be prevented.
[0037]
As the capacity of the sub-tank, a small capacity container of 300 liters or less, preferably 50 to 250 liters is used. When the capacity is 300 liters or less, the capacity necessary for temporarily storing the chemical solution can be secured without excessively occupying the work space. If it exceeds 300 liters, the occupied space becomes large, so that other work spaces are narrowed accordingly, and the efficiency tends to deteriorate.
[0038]
Conventionally, urethane chemical liquid transfer work from the transport tank to the main tank is basically performed outside the pit where a certain amount of space can be secured, so simply increasing the capacity of the urethane chemical liquid container compared to the conventional method will inject urethane chemical liquid. Even if a small amount is insufficient during the process, it is necessary to suspend the injection work, go out of the mine, replenish the urethane chemical solution, return to the mine again and restart the work, and considerable time and labor is required. I needed it. However, by installing a sub-tank, even if a shortage of the chemical in the main tank is required, a sufficient amount of the chemical can be replenished from the conventional 18L petroleum can to the sub-tank, and the work can be continued without interruption. It becomes.
[0039]
As a pipe for connecting the injection tank, the main tank and the sub tank, and a pipe for connecting the main tank to the transport tank before the injection work, for example, as a general liquid supply hose equipped with a connection adapter at both ends. The used flexible hose is used.
[0040]
The infusion pump, a set of urethane chemical liquid infusion equipment such as a main tank and a subtank are preferably mountable or mounted on one self-propelled vehicle, for example, can be mounted or installed on a carrier of a commercially available 4-ton loadable truck. Preferably. Since the working space inside the tunnel is usually small, it is necessary to make the space for the injection work equipment and urethane chemical solution as compact as possible, and before and after the injection work, it does not hinder other construction work and the movement of heavy equipment and trucks. As quickly as possible. Furthermore, it is desired that the time required for the injection work process be reduced as much as possible, and that the progress of the entire tunnel excavation work be made more efficient. Conventionally, urethane chemicals were manually transferred and the work of clearing empty cans required labor, space and time, which reduced work efficiency. However, a complete set of urethane chemical injection equipment was loaded onto a commercially available 4 ton loader. By enabling simultaneous installation on the loading platform of a possible truck and rationalizing the injection system that can be quickly moved into and out of the tunnel before and after the injection work, it is possible to reduce the time and efficiency of the entire tunnel excavation work.
[0041]
In the present invention, the transfer of the urethane chemical from the transport tank to the main tank is performed outside the tunnel before the injection operation, and is performed by pressurized transfer with dry air or nitrogen gas, transferred by the liquid feed pump, and the weight of the chemical liquid. And at least one transfer means selected from the group consisting of transfer by free fall by means of. The pressurized transfer can be performed by introducing dry air or nitrogen gas at 10 kPa to 200 kPa, preferably 30 kPa to 60 kPa. If the pressure is less than 10 kPa, the pressure tends to take a long time due to the low pressure. If the pressure exceeds 200 kPa, a high pressure is applied in the tank, and the tank tends to be deformed or the pipe connection may be disconnected. is there. The transfer by the liquid sending pump is preferably performed at a transfer pressure of 10 kPa to 200 kPa. If the pressure is less than 10 kPa, the transfer tends to take a long time, and if the pressure exceeds 200 kPa, a load is applied to the pipe connection portion, and there is a tendency that there is a risk of disconnection.
[0042]
The method of using the apparatus of the present invention to send urethane chemicals in the main tank and the sub-tank by an injection pump and injecting and solidifying the ground and the like via bolts is not particularly limited, and a known method is adopted. I can do it. For example, using a comparative compounding pump capable of controlling the injection amount, pressure, compounding ratio, etc. of the A component and the B component described later, put the A component and the B component in separate containers, At a predetermined location (for example, a plurality of holes drilled at intervals of about 0.3 to 3 meters), a perforated lock bolt or injection rod containing a static mixer, a check valve, or the like fixed in advance is inserted. Each component in the tank is injected at an injection pressure of 0.05 to 5 MPa, and a predetermined amount of the component A and the component B are uniformly mixed through a static mixer. To stabilize the consolidation by injecting and hardening.
[0043]
There is no particular limitation on the urethane chemical solution, and a urethane injecting material usually composed of two components and manufactured by a known method can be used. As the urethane injection material used for this application, there are generally a urethane injection material and a silica resin injection material, and in terms of composition, the former is mainly composed of an A component containing a polyether polyol as a main component and a polyisocyanate as a main component. It consists of the B component. The latter is composed of an A component mainly composed of an aqueous sodium silicate solution and a B component mainly composed of polyisocyanate, which are inorganic substances and classified as non-hazardous substances under the Fire Service Law. Therefore, when the latter is adopted as a urethane chemical solution, a plastic container can be used as a tank for transporting the component A and a main tank. The mixing ratio of the A component and the B component of the urethane chemical used for this application is generally about A / B = 1 / 0.5 to 3 (mass ratio).
[0044]
Here, the configuration of FIG. 1 in which the main tank and the sub tank are both connected to the infusion pump has been described. However, even if the sub tank is connected to the main tank by piping and the main tank is connected to the infusion pump. Of course it is good. In this case, the medicine in the sub tank is transferred to the infusion pump via the main tank. Further, in the example of FIG. 1, the main tank and the sub tank are connected to one injection pump, but a dedicated injection pump may be provided for each of the main tank and the sub tank.
[0045]
【The invention's effect】
According to the first device and the second device of the present invention, the injection work efficiency is improved by providing the sub-tank.
[0046]
ADVANTAGE OF THE INVENTION According to the 3rd apparatus of this invention, urethane injection | pouring can be performed efficiently and it does not occupy the space for underground work excessively.
[0047]
ADVANTAGE OF THE INVENTION According to the 4th apparatus of this invention, urethane chemical | medical solution transfer in a closed system is possible, and improvement of underground work environment and quality deterioration suppression of urethane chemical | medical solution by urethane chemical transfer can be aimed at.
[0048]
According to the fifth apparatus of the present invention, by installing the looking tube in the main tank, it becomes possible to manage the urethane chemical volume in the main tank.
[0049]
According to the sixth device of the present invention, the hook can be moved to lift the main tank and control the mass of the chemical solution.
[0050]
According to the seventh apparatus of the present invention, the work efficiency of the entire excavation work can be improved by the compact arrangement of the injection equipment and the securing of mobility.
[0051]
According to the eighth apparatus of the present invention, the urethane chemical solution in the transport tank is transferred to the main tank, and the empty transport tank is recycled (reused) to reduce the cost of empty container disposal processing. Further, it is possible to improve the efficiency of the work of receiving the amount of the urethane chemical used.
[0052]
According to the ninth apparatus of the present invention, the transfer efficiency of the chemical solution is improved by utilizing the transfer by pressure, the transfer by the liquid feed pump, or the free fall transfer by the own weight of the chemical solution.
[0053]
ADVANTAGE OF THE INVENTION According to the 10th apparatus of this invention, urethane chemical | medical solution transfer in a closed system is possible, and it can aim at the improvement of underground work environment, and the quality deterioration suppression of urethane chemical | medical solution by urethane chemical transfer.
[0054]
According to the eleventh device of the present invention, the lifting of the transport tank and the mass control of the chemical solution can be performed by installing the hook portion.
[0055]
As described above, according to the present invention, a large-capacity container is used as a chemical liquid transport tank and a main tank, and further, the transport tank is collected and reused as a chemical liquid transport container, whereby the chemical liquid can be reused. After confirming the loading and quantity, the injection equipment and chemicals were installed on the truck bed with mobility, and then moved into the mine to perform the injection work. It is possible to comprehensively improve the urethane chemical liquid injection system including the inspection of the use amount of the chemical liquid and the processing of the chemical liquid packaging material after use.
[Brief description of the drawings]
FIG. 1 is a schematic view of a urethane liquid injector according to the present invention.
FIG. 2 is a schematic view of a conventional urethane liquid injector.
[Explanation of symbols]
1,2 urethane chemical injection device
3 A main tank
4 B liquid main tank
5 A liquid sub tank
6 Liquid B subtank
7 Hook section
8 Looking tube
9 Tank for transporting liquid A
10 B liquid transport tank
11, 16 Control valve
12 A liquid container
13 B liquid container
14, 15 oil cans,
P1, P2, P11, P12 Infusion pump
A Transfer
B Human input
C injection

Claims (11)

A ground stability strengthening urethane chemical injection device for injecting a urethane chemical into the ground using an injection pump,
It consists of an infusion pump, a main tank for urethane chemicals, and a sub tank for urethane chemicals.
A urethane chemical injection device for ground stabilization, in which the sub tank is connected to the main tank by piping and the main tank is connected to the injection pump by piping. A ground stability strengthening urethane chemical injection device for injecting a urethane chemical into the ground using an injection pump,
It consists of an infusion pump, a main tank for urethane chemicals, and a sub tank for urethane chemicals.
A urethane chemical injection device for strengthening ground stability, in which the main tank is connected to the injection pump by piping and the sub tank is connected to the injection pump without passing through the main tank. 3. The urethane chemical liquid injection device according to claim 1, wherein the capacity of the main tank is 500 liters or more, and the capacity of the sub tank is 300 liters or less. 4. The main tank is a metal pressure-resistant container, is capable of filling dry air or nitrogen gas in the gas phase in the tank, and has a gas inlet and a safety valve, and has a gas inlet and a safety valve. 4. The urethane chemical injection device for enhancing ground stability according to claim 1, wherein the urethane chemical can be pressurized and transferred to a liquid feed pump by supplying dry air or nitrogen gas. The main tank has a transparent or translucent looking tube connecting the main tank upper part and the main tank lower part, and the urethane liquid amount in the main tank can be observed by the urethane liquid level in the looking tube. The urethane chemical injection device according to claim 1, 2, 3, or 4. The urethane chemical injection device for reinforcing ground stability according to claim 1, 2, 3, 4, or 5, wherein the main tank is provided with a hook for lifting. The urethane chemical liquid injection device for reinforcing ground stability according to claim 1, 2, 3, 4, 5, or 6, wherein the injection pump, the main tank, and the sub tank are mounted on a self-propelled vehicle. Further, there is provided a transport tank having a capacity of 500 liters or more for transferring urethane chemicals to the main tank, and the transport tank is detachably connected to the main tank by piping. 8. The urethane liquid injector for enhancing ground stability according to claim 6, 6 or 7. The transfer of the urethane chemical from the transport tank to the main tank is performed by pressurized transfer using dry air or nitrogen gas, transfer by a liquid feed pump, free fall transfer by the chemical liquid's own weight, or a combination thereof. Urethane chemical injection device for strengthening ground stability. The transport tank is a metal pressure-resistant container, is capable of sealing dry air or nitrogen gas in the gas phase in the tank, and has a gas inlet and a safety valve, from which the gas is introduced. The urethane chemical liquid injection device according to claim 8 or 9, wherein the urethane chemical liquid can be pressure-transferred to the main tank by supplying dry air or nitrogen gas. 11. The urethane chemical liquid injection device according to claim 8, 9 or 10, wherein the transport tank includes a hook for lifting.

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