JP6360922B1 - Injection device and injection method using the same - Google Patents

Abstract

[PROBLEMS] To ensure the safety of backfill injection by ensuring that curable drug injection is completed immediately without depending on the judgment and operation of the operator, and adequate and necessary amount of curable drug can be ensured. An injection device capable of injection is provided. An injection device 1 is connected to a main tube 41 connected at a proximal end to a main pumping pump 21 that pressurizes and feeds a curable drug, and is connected to an injection tube 14 inserted into a cavity at a distal end. The main feed pipe 11 communicates with the connecting portion 11c provided on the main feed pipe 11, and the air introduction pipe 13 for introducing the compressed air into the medicine main feed pipe 11 is attached to the main feed pipe 11 and rises in response to the injection of the curable drug. A pressure sensor 13b1 that measures the pressure of the compressed air, a determination unit that determines that the pressure difference between the start of injection of the curable drug and the injection of the curable drug has reached a threshold value, thereby stopping the operation of the main pumping pump 21 It has an output unit for outputting a signal and a switch unit 24 having a switch for stopping the operation thereof. [Selection] Figure 1

Description

  The present invention relates to an injection device for injecting a curable drug filling a cavity formed on the back of a tunnel lining or under a building foundation, and an injection method using the same.

  In existing tunnels, especially tunnels constructed using the sheet pile method, there may be a cavity between the tunnel lining concrete and the natural ground due to the remaining gap between the support and the sheet pile and the natural ground. is there. In addition, a cavity may be formed between the foundation and the ground due to ground subsidence associated with a decrease in groundwater under the foundation of the building.

  If this cavity is left unattended, the ground will collapse and the tunnel lining concrete will crack, or the foundation will not be able to support the building and it will be tilted, making it safe to use the tunnel and building. May interfere. For this reason, work is being carried out to fill the cavity by injecting a curable agent into such a cavity to ensure the safety of tunnels and buildings. This construction method is called backfilling.

  Non-Patent Document 1 discloses a construction procedure for backfilling in a road tunnel. This backfill injection method forms a plurality of holes in the lining concrete from the pit toward the cavity, inserts a scale from this hole, measures the volume of the cavity, and the amount of curable agent to be injected After inserting the drug injection tube into this hole and fixing it, attaching one end of the injection tube to the drug injection tube and the other end to the drug pressure pump, then operating the drug pressure pump to set the curable drug Is injected into the cavity while confirming the injection pressure and the injection amount, and the injection is terminated when it can be visually confirmed that the excessive curable chemical has overflowed from the hole.

  Examples of the curable agent used for this backfilling injection include inorganic materials such as mortar and cement, and organic materials such as foamed polyurethane. Among them, polyurethane foam is lightweight and has the feature that it can be foamed by simply mixing raw material chemicals at the construction site, expands to a volume of several to several tens of times, cures and fills the cavity.

  In backfilling, the cavity is behind the lining concrete, so it is difficult to accurately measure its volume. Therefore, the amount of the medicine to be injected before construction cannot be determined accurately. It is also difficult to accurately grasp the volume occupied by the cured product of the curable drug, particularly the foamed organic material, with respect to the volume of the cavity during the injection of the drug. Therefore, in order to avoid excessive sclerosing drug injection, the pressure in the cavity suddenly rises and the curable drug that has flowed back is scattered or the tunnel lining concrete is damaged. It is necessary for the operator to always monitor the pressure of the curable drug by visual observation so that the pressure of the curable drug does not exceed a predetermined value, specifically 0.2 MPa or more. When the pressure gauge reaches 0.2 MPa, the operator who monitors the pressure gauge can perform this operation on another worker who operates the chemical pump, even before confirming the overflow from the drilling hole. Stop and promptly end drug injection.

  Especially when filling the cavity with foamed polyurethane, even if the injection of the foamed polyurethane raw material liquid, which is the raw material chemical liquid mixture, is stopped, the reaction of the raw material chemical liquid mixture that has been injected into the cavity continues to progress, tens of times while foaming Since it expands to the volume, it is necessary to end the injection of the foamed polyurethane raw material liquid immediately before the foamed polyurethane raw material liquid overflows from the hole or reaches a pressure of 0.2 MPa. However, relying solely on the operator's judgment to end the injection of the drug may cause oversight of the worker's pressure rise, mistaken operation of the drug pressure pump, and human errors such as miscommunication of instructions between the workers and transmission delays. It is difficult to ensure the safety of construction.

  In addition, liquid curable chemicals such as foamed polyurethane raw material liquid vary in viscosity and fluidity depending on its temperature and flow rate, so there are large fluctuations in pressure. For example, it is suppressed to less than 0.2 MPa. In some cases, the foamed polyurethane raw material liquid is excessively injected into the cavity. In addition to impairing the safety of the backfill injection work, foaming of the foamed polyurethane raw material liquid may lead to the accumulation of heat generated in the production of the foamed polyurethane and may cause a fire in the cavity. Since the polyurethane raw material liquid is consumed more than necessary, it is uneconomical.

  Furthermore, since the criterion of 0.2 MPa is too high, it is preferable that the foamed polyurethane raw material liquid is sufficiently foamed to fill the cavity until the strength becomes sufficient.

Civil Engineering Research Institute Fundamental Road Technology Research Group (Tunnel Team), “Road Tunnel Deformation Work Manual (Draft)”, February 2003, Public Works Research Institute Material 3877, p. 106-118

  The present invention has been made to solve the above-described problems, and ensures the safety during the construction of the backfill injection work by reliably terminating the injection of the curable drug without depending on the judgment and operation of the operator. It is an object of the present invention to provide an injection device that can be ensured and can inject an appropriate and necessary amount of a curable drug without excess or deficiency, and an injection method using the same.

An injection device of the present invention made to achieve the above object is an injection device for a curable drug selected from a curable filler injected into a cavity and a raw material thereof, wherein the curable drug is injected into the cavity. Connected to the main tube connected at the base end to the main pumping pump that sends out under pressure, and is provided on the tube wall of the drug main supply tube connected to the injection tube inserted into the cavity at the distal end An air introduction pipe that is communicated in an airtight manner at the connected portion, and that introduces compressed air from an air compressor into the medicine main feed pipe to feed the curable medicine into the injection pipe while stirring, and the air introduction pipe The pressure of the compressed air that rises according to the degree of injection and / or hardening of the curable drug is attached to the air introduction pipe through the injection pipe that discharges the curable drug. Te, a total of The pressure sensor, a pressure determination unit that determines that the difference in pressure at the start of injection of the curable drug and during the injection thereof has reached or exceeded a threshold, and the determination according to the determination of the previous pressure determination unit It has an output part which outputs the signal which stops operation of a pumping pump, and a switch unit provided with a switch which receives the signal and stops the operation.

  The injection device communicates with the drug main feeding pipe at a branch portion between the leading end and the connection portion, and is connected to a sub pumping pump that pressurizes and feeds a curable drug different from the curable drug. It may be provided with a medicine auxiliary feeding pipe connected to the tube.

  The injection device includes a main flow meter that integrates the flow rate of the curable drug, a sub flow meter that integrates the flow rate of the different curable drug, and an integration of at least one measured by the main flow meter and the sub flow meter. A flow rate determination unit that determines that the value has reached or exceeded the upper limit value, and the output unit stops the operation of the main pumping pump and the sub pumping pump according to the determination of the flow rate determination unit It is preferable to output a signal.

  The injection device has an inner tube in which the drug main feeding tube is fixed in the interior thereof and allows the curable drug to flow, and a distal end of the inner tube is located between the distal end and the branch portion. It is preferable.

  The injection device is one in which the raw material of the curable filler, which is polyurethane foam, is an isocyanate compound-containing liquid sent by the drug main feed pipe, and a polyol compound-containing liquid and a foaming agent sent by the drug sub-feed pipe It may be.

  It is preferable that the injection device includes a calculation unit that calculates the pressure difference and a storage unit that stores the pressure and the threshold value at the start of the injection.

  The injection device may include a transmission unit that transmits the pressure value measured by the pressure sensor as an electrical signal by wire or wirelessly and a reception unit that receives the electrical signal. .

  As for an injection apparatus, the thing whose said threshold value is 0.05-0.20 MPa is mentioned, for example.

  The injection method of the present invention uses the injection device according to any one of the above, and the cavity portion selected from a cavity at the back of a tunnel lining, a cavity under a building foundation, a void in a structure of a building, and a horizontal shaft Is filled with a cured product of the curable drug.

  The injection method may be selected from abandoned mine, waterway, air defense pit, and lifeline buried mine.

  The injection device of the present invention automatically stops the injection of the curable drug based on the value measured by the pressure sensor attached to the air introduction pipe, and the operator determines whether to stop the injection of the curable drug. Because it does not depend on or operation, no human error occurs. As a result, the backfilling can be performed safely and reliably.

  In addition, the injection device measures the pressure of compressed air, which can measure the pressure with high precision and accuracy compared to the pressure of a liquid such as a curable drug, so the amount of curable drug injected into the cavity is excessive. Not. Therefore, the threshold value, which is the differential pressure at which injection of the curable drug should be stopped, can be set lower than the conventional 0.2 MPa. If this threshold is 0.05 to 0.20 MPa, preferably 0.05 to 0.15 MPa, excessive pressure rise in the cavity can be suppressed, and an appropriate amount of curable agent can be injected without excess or deficiency. There is no damage, damage to the injection device due to the back flow of the curable drug, and scattering of the curable drug due to it.

  When the injection device has an inner pipe fixed in the interior of a medicine main feed pipe for sending the polyol compound-containing liquid and the foaming agent and a medicine main feed pipe for sending the isocyanate compound-containing liquid, the polyol compound-containing liquid and Since the foaming agent and compressed air are impinged and mixed, and the isocyanate compound-containing liquid joins and is mixed and stirred, a foamed polyurethane raw material liquid that is uniformly mixed can be prepared. Since the foamed polyurethane produced by this foamed polyurethane raw material liquid is sufficiently foamed and expanded, the amount of isocyanate compound-containing liquid, polyol compound-containing liquid, and foaming agent required to fill the cavity without gaps can be reduced, and low Backfill injection can be performed at a low cost. In addition, according to this injection device, the foamed polyurethane raw material liquid, which is a curable drug, does not cause an excessive amount of injection that reaches 3 to 5 times the amount to be injected determined by calculation, for example. Does not cause fire or overheating due to accumulation of heat generated.

  The injection device has a main flow meter that integrates the flow rate of the isocyanate compound-containing liquid sent out by the main pumping pump, and a main flow meter that integrates the flow rates of the polyol compound-containing solution and the blowing agent sent out by the sub pumping pump. Since the use amounts of the isocyanate compound-containing liquid, the polyol compound-containing liquid, and the foaming agent can be managed separately, the mixing ratio of the two can always be kept constant. Moreover, when the flow rate determination unit determines that the integrated flow rate value measured by each flow meter has reached or exceeded the upper limit value, which is a necessary amount for calculation, the main flow rate is automatically set regardless of the operator's operation. The operation of both the pressure pump and the sub-pressure pump is stopped, and the foamed polyurethane raw material liquid is no longer injected into the cavity, so that excessive injection of the foamed polyurethane raw material liquid can be prevented.

  According to the injection method of the present invention, not only the cavity on the back side of the tunnel lining but also the cavity under the building foundation, the cavity formed by the partial defect in the building structure, and the abandoned mine, waterway, air defense fence, and lifeline A horizontal shaft such as a buried shaft can also be filled and filled with a curable drug.

It is a model front view which shows the injection apparatus to which this invention is applied. It is a block diagram explaining cooperation of the switch unit mounted in the pump controller of the injection device to which the present invention is applied, the pressure sensor unit, the flow meter, and the pressure feed pump. It is a model fragmentary sectional front view which shows the chemical | medical agent induction composite tube of the injection device to which this invention is applied. It is a model fragmentary sectional side view which shows the process of the injection | pouring method using the injection | pouring apparatus to which this invention is applied. It is an external appearance photograph which shows each result of the Example which performed backfilling injection using the injection | pouring method to which this invention is applied, and the comparative example which does not apply this invention.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  A schematic front view of one embodiment of the injection apparatus of the present invention is shown in FIG. The injection device 1 includes a drug main feed pipe 11, a drug guide composite pipe 10 having a drug sub-feed pipe 12 and an air introduction pipe 13 connected so as to branch from each other, and a drug main feed pipe 11 and a drug sub-feed pipe 12. A main pressure pump 21 and a sub pressure pump 22 connected to each other, and an air compressor 30 connected to the air introduction pipe 13.

  The main drug delivery tube 11 has an inner tube 11e in its inner space (see FIG. 3). An injection pipe 14 that is inserted into a hole 74 formed in the lining concrete 71 and discharges a curable drug is screwed into and connected to the distal end 11a of the drug main feed pipe 11 (see FIG. 3). As this sclerosing | hardenable agent, the foaming polyurethane raw material liquid which is a mixture of an isocyanate compound containing liquid and a polyol compound and a foaming agent containing liquid is mentioned, for example. The foamed polyurethane raw material liquid injected from the injection tube 14 into the cavity 73 undergoes a chemical reaction and foams and hardens while expanding 8 to 40 times to produce a bulky polyurethane foam. This foamed polyurethane fills the cavity 73.

  One end of the main tube 41 is connected to the proximal end 11 b of the drug main delivery tube 11. The main tube 41 is in fluid communication with the inner tube 11e of the drug main delivery tube 11. The other end of the main tube 41 is connected to the main pumping pump 21. The connecting portion 11c connected to the air introduction tube 13 between the distal end 11a and the proximal end 11b of the medicine main feeding tube 11 is connected to the medicine auxiliary feeding tube 12 between the connecting portion 11c and the distal end 11a. Branch portions 11d are opened through the tube wall of the main drug delivery tube 11, respectively. One end of the medicine sub-feed pipe 12 is bent in an L shape, and is screwed to the medicine main feed pipe 11 at a branching portion 11d ahead of the medicine sub-feed pipe 12 (see FIG. 3). The other end of the medicine subfeed pipe 12 is connected to the sub pumping pump 22 via the subtube 42.

One end of the air introduction tube 13 is bent in an L-shape, and is screwed into the drug main delivery tube 11 at an end connecting portion 11c to be connected in an airtight manner (see FIG. 3). The other end of the air introduction pipe 13 is connected to an air compressor 30 that generates compressed air via an air tube 43. A Bourdon tube 13a for displaying the air pressure inside the air introduction tube 13 and a pressure sensor unit 13b are attached in series. The Bourdon tube 13a is provided for the operator to confirm the approximate pressure in the air introduction tube 13 by visual observation. The pressure sensor unit 13b is provided with a pressure sensor 13b ₁ that measures the air pressure in the air inlet tube 13, a radio transmission unit which the electrically connected wirelessly transmits the pump unit 20 instead of the measured value into an electrical signal and 13b _2, it has.

The pressure sensor 13b ₁ is a device that includes a diaphragm and a pressure-sensitive element, and converts the amount of diaphragm distortion caused by the pressure in the air introduction tube 13 into an electrical signal. Examples of the diaphragm include a stainless diaphragm and a silicon diaphragm, and examples of the pressure sensitive element include a capacitive pressure sensitive element in which an insulator is sandwiched between electrodes and a pressure sensitive conductive rubber type pressure sensitive element in which conductive rubber is sandwiched between electrodes. . Such a pressure sensor 13b ₁ preferably has a measurable maximum pressure of 1.00 to 2.00 MPa and a resolution of 0.01 MPa. The pressure sensor 13b ₁ is always the pressure can be measured, it is preferable the value of 50 × 10 ^-9 seconds after the measurement time are those which can be obtained as a pressure value. Thereby, noise caused by a very small pressure change can be eliminated, and an accurate pressure value can be acquired.

As the wireless transmission unit 13b ₂ , a general-purpose device can be used as long as it is electrically connected to the pressure sensor 13b ₁ and can transmit an electric signal transmitted from the pressure sensor 13b ₁ to the switch unit 24 wirelessly. The injection device 1 may not include the wireless transmission unit 13b ₂ and the pressure sensor 13b ₁ and the switch unit 24 may be connected by wire.

  The main drug delivery pipe 11, the secondary medicine delivery pipe 12, and the air introduction pipe 13 each have ball valves 11f, 12a, and 13c that open or close the inside of the pipe.

  The pump unit 20 includes a main pressure pump 21, a sub pressure pump 22, a pump controller 23 that controls the operations of both the pressure pumps 21 and 22, and a wireless receiver 24a that receives an electrical signal transmitted from the pressure sensor unit 13b. The switch unit 24 is provided. Further, the pump controller 23 is electrically connected to the both pumps 21 and 22, and the pump controller 23 sends the electrical signals for operating, stopping, and instructing the rotational speed to the pumps 21 and 22. Is controlling.

  The main pumping pump 21 is connected to the main tank 51 via the raw material supply tube 44, and the sub pumping pump 22 is connected to the subtank 52 via the raw material supply tube 45. The pump controller 23 controls the operations of the pressure pumps 21 and 22 to supply the isocyanate compound-containing liquid and the polyol compound and the foaming agent-containing liquid respectively charged into the tanks 51 and 52 to the drug main feed pipe 11 and the drug sub-feed. Each is sent to the tube 12. The pump controller 23 is provided with a manual switch for generating an electrical signal for operating or stopping the two pumps 21 and 22 and changing both the liquid feed amount and the ratio thereof. The operator can operate both the pressure-feed pumps 21 and 22 via the pump controller 23 by operating this manual switch.

  Specifically, for example, when an electric signal for starting the operation of the pump motor is sent to the main pumping pump 21 by turning on a manual switch of the pump controller 23, for example, the main pumping pump 21 is placed in the main tank 51. Aspirate the isocyanate compound-containing liquid. Thereby, the main pumping pump 21 guides the isocyanate compound-containing liquid to the raw material supply tube 44, pressurizes it, sends it to the main tube 41, and sends it to the drug main feeding tube 11 ahead of it. Further, when an electric signal for stopping the operation of the pump motor is sent from the pump controller 23, the main pumping pump 21 stops its operation, and the sending of the isocyanate compound-containing liquid stops. Similarly to the main pumping pump 21, the sub pumping pump 22 controls the feeding and stopping of the polyol compound and the foaming agent-containing liquid.

  A main flow meter 21a that integrates and measures the amount of the isocyanate compound-containing liquid that has been sent out is a main pumping pump 21, and a sub flow meter 22a that adds and measures the amount of the polyol compound and the blowing agent-containing liquid that has been sent out is a sub-pump pump. 22, respectively. Both flow meters 21 a and 22 a are electrically connected to the meter in the pump controller 23 and the switch unit 24.

  As both flowmeters 21a and 22a, for example, a volumetric flowmeter that rotates the rotor by the energy of the fluid and calculates the flow rate from the number of rotations thereof, a Coriolis that calculates the flow rate by measuring the mass of the fluid that flows within a unit time Flow meter, vortex flow meter to calculate flow rate from Karman vortex generation frequency, ultrasonic flow meter to calculate flow rate from difference in propagation time of ultrasonic waves transmitted and received alternately between two transducers sandwiching fluid, A turbine flow meter that calculates the flow rate from the number of revolutions of a turbine having an axis parallel to the flow within a unit time, and the amount of heat deprived from the flow rate sensor and the amount of deprived heat by the flowing fluid having the flow rate sensor and the temperature sensor Therefore, there is a thermal mass flow meter that calculates the flow rate from the amount of electric power applied to the flow velocity sensor. Both flow meters 21a and 22a may be the same type or different types.

The pump controller 23, the pressure of the compressed air that is measured by the pressure sensor 13b _1, both flow meters 21a, and the accumulated amount of the measured isocyanate compound-containing solution and polyol compound and the blowing agent-containing liquid by 22b, the mixing of the two A meter indicating the accumulated amount of the prepared polyurethane raw material liquid, the remaining amount of the foamed polyurethane raw material liquid to be injected, and a lamp indicating the operation status of the switch unit 24 to be described later are attached. The operator can grasp the progress of the backfilling by viewing these instruments.

A switch unit 24 is mounted on the pump controller 23. FIG. 2 is a block diagram for explaining the cooperation of the switch unit 24, the pressure sensor unit 13b, the two pumps 21 and 22, and the two flow meters 21a and 22a. Switch unit 24, a pressure storage unit for storing a radio receiving section 24a for receiving the electrical signal is the value of pressure transmitted from the wireless transmission section 13b ₂ of the pressure sensor unit 13b, and pressure values radio reception section 24a receives 24 b ₁ , a flow rate storage unit 24 _{b 2} that stores the flow rate values sent from both flow meters 21 a and 22 a, and a calculation unit 24 c that calculates a differential pressure between the pressure at the start of drug injection and the injection pressure during drug injection, , A pressure determination unit 24d ₁ , a flow rate determination unit 24d ₂ , an output unit 24e, and a stop switch 24f different from the manual switch described later are provided. Threshold is the maximum differential pressure allowed is input to the pressure storage unit 24b ₁ in advance by the operator. The upper limit of the isocyanate compound required amount of foamed polyurethane material liquid to be injected to prepare liquid containing and polyol compound and the blowing agent-containing liquid has been input in advance to the flow rate storage unit 24b ₂ by the operator. Both storage units 24b ₁ and 24b ₂ of the switch unit 24 store and hold the threshold value and the upper limit value.

Immediately after the start of the injection of the foamed polyurethane raw material liquid, the temperature of the foamed polyurethane raw material liquid remaining in the drug induction composite tube 10, the two pressure feed pumps 21, 22, and the tubes 41, 42, 43, 44, 45 and the raw material liquids thereof. Due to the change and pressure fluctuation until the inner space of the drug induction composite tube 10, the two pumps 21, 22 and the tubes 41, 42, 43, 44, 45 is filled with the foamed polyurethane raw material liquid or its raw material liquid The pressure measured by the Bourdon tube 13a and the pressure sensor 13b ₁ is not constant, and the pressure fluctuates in the range of ± 0.10 MPa at the maximum and at least ± 0.05 MPa.

Thereafter, when the injection of the foamed polyurethane raw material liquid is continued, the foamed polyurethane raw material liquid and the inside of the drug induction composite tube 10, both the pressure feed pumps 21 and 22, and the inner spaces of the respective tubes 41, 42, 43, 44, and 45 The raw material liquid is filled. As a result, their temperature and pressure are stabilized, so that pressure fluctuations converge. Specifically, it is stable in the range of ± 0.03 MPa, preferably in the range of ± 0.01 MPa. Further, when the injection of the foamed polyurethane raw material liquid is continued, the injection amount of the foamed polyurethane raw material liquid into the cavity 73 further increases. Since the volume of the polyurethane foam occupying the cavity 73 increases with the injection and foaming of the foamed polyurethane, it becomes difficult to inject gradually, and the liquid feed pressure of the foamed polyurethane raw material liquid by the compressed air rises. The pressure of the air in the air introduction pipe 13 measured by the sensor 13b ₁ also gradually increases.

Radio transmitting section 13b ₂ of the pressure sensor unit 13b is a pressure value of the compressed air sequentially transmitted to the switch unit 24, wireless receiving unit 24a receives this. Further, the pressure storage unit 24b ₁ stores this pressure value. Calculation unit 24c, a new pressure value each time is stored in the pressure storage unit 24b _1, calculates the difference between the pressure value immediately before. Further pressure determination unit 24d _1, the difference is ± 0.03 MPa, preferably at least 5 seconds to be in the ± 0.01 MPa, preferably determines that the determining 10 seconds the pressure variations stable converged. Thereby, the pressure storage unit 24b ₁ stores the initial pressure at the start of injection. When the pressure sensor 13b ₁ acquires the pressure value of the compressed air during the injection of the foamed polyurethane raw material liquid, the wireless transmission unit 13b ₂ transmits the pressure value to the switch unit 24, which is stored in the pressure storage unit 24b _1. .

The calculation unit 24c sequentially calculates a differential pressure between the pressure value transmitted each time and the initial pressure at the start of the injection of the foamed polyurethane raw material liquid, and the pressure determination unit 24d ₁ stores the differential pressure and the pressure storage unit 24b ₁ in advance. -Sequential comparison with the retained threshold. When that this pressure difference has exceeded or reached the threshold value stored in the pressure storage unit 24b ₁ the pressure determination unit 24d ₁ determines the output unit 24e is stopped an electric signal to stop the operation of both the pressure pump 21 switch To 24f. When receiving the electrical signal, the stop switch 24f stops the power supply to both the pressure-feed pumps 21 and 22 and the air compressor 30 and stops their operations. Thereby, the injection of the foamed polyurethane raw material liquid is also stopped.

Threshold that is input to the pressure storage unit 24b ₁ is preferably less than 0.20 MPa, more preferably from 0.15～0.10MPa, and even more preferably less than 0.10 MPa. If the threshold is too low, for example, a few kPa, injection of the foamed polyurethane raw material liquid is interrupted only by a slight pressure increase that does not hinder safe construction during the injection of the foamed polyurethane raw material liquid, Smooth construction will be hindered. On the other hand, when the threshold value exceeds the upper limit, the foamed polyurethane raw material liquid flows backward from the injection pipe 14 toward the drug main feed pipe 11, and due to the pressure, the drug sub-feed pipe 12 and the air introduction pipe are connected at the connection portion 11c and the branch portion 11d. 13 is released, and the foamed polyurethane raw material liquid and the raw material thereof are scattered, or the excessive pressure applied to the lining concrete 71 causes breakage of the foamed polyurethane raw material liquid. Further, since the foamed polyurethane already filled in the cavity 73 is refilled into the cavity 73 while the foamed polyurethane derived from the newly injected foamed polyurethane raw material liquid is crushed, it is uneconomical.

Meanwhile both flow meters 21a, 22a transmits the measured values successively in the flow storage unit 24b _2. The flow rate storage unit 24b ₂ temporarily stores the integrated flow rate values respectively transmitted from both the flow meters 21a and 22a. The flow rate determination unit 24d ₂ uses the integrated flow rate value, the upper limit value of the isocyanate compound-containing liquid amount stored in advance in the flow rate storage unit 24b _2, and the upper limit value of the polyol compound and the blowing agent-containing liquid amount as the flow rate storage unit 24b. _{2 is} read and the integrated flow rate value is compared with the upper limit value. As a result, the cumulative flow value of the isocyanate compound-containing liquid has reached or exceeded its upper limit, and the cumulative flow value of the polyol compound and the foaming agent-containing liquid has reached or exceeded its upper limit. When at least one of the _two is determined by the flow rate determination unit 24d2, the output unit 24e transmits an electrical signal for stopping the operations of the two pumps 21 and 22 to the stop switch 24f. When receiving the electrical signal, the stop switch 24f stops the power supply to both the pressure-feed pumps 21 and 22 and the air compressor 30 and stops their operations. Thereby, the injection of the foamed polyurethane raw material liquid is also stopped. Note that the electric signal output from the output unit 24e according to the determination of the pressure determination unit 24d _1, and the electric signal output from the output unit 24e according to the determination of the flow rate determination unit 24d _2, even the same kind in different The stop switch 24f may be reached via the same or different route.

Thus, since the injection device 1 of the present invention has the pressure sensor 13b ₁ for measuring the pressure of the air in the air introduction pipe 13, the pressure reaches a pressure that can be safely applied based on the measured value. Or when it exceeds, the injection | pouring of a foaming polyurethane raw material liquid can be stopped automatically. As a result, there is no oversight of workers' pressure rises, mistakes in the operation of the drug pressure pump, and mistakes due to human errors such as instruction transmission errors and transmission delays between workers. And it can be implemented reliably.

  Moreover, in order to stop the injection of the foamed polyurethane raw material liquid, the pressure of the foamed polyurethane raw material liquid, the isocyanate compound-containing liquid, the polyol compound, and the foaming agent-containing liquid, which are liable to change in viscosity and fluidity depending on the temperature and flow rate, Since the pressure of the compressed air flowing through the air introduction pipe 13 that can be measured stably and with high accuracy is monitored, the pressure at the start of injection and the pressure at the time of injection are used to fill the cavity 73 with foamed polyurethane without any gap. Even if the threshold of the differential pressure is 0.10 MPa (that is, the actually measured pressure is the initial pressure + 0.10 MPa) which is lower than the conventional 0.2 MPa and can be safely constructed, the foamed polyurethane is passed through the cavity 73. Can be filled without shortage.

Further, the flow meters 21a and 22a always measure the integrated flow rate of the isocyanate compound-containing liquid and the polyol compound and the foaming agent-containing liquid, and the foamed polyurethane raw material liquid to be injected, which is calculated based on the result of the volume measurement of the cavity, Since the flow rate determination unit 24d ₂ determines that the upper limit value of both contained liquids required for preparation has been reached or exceeded, and the operation of both the pressure pumps 21, 22 is automatically stopped, It is possible to prevent excessive injection of the foamed urethane raw material liquid by monitoring the flow rates of the two liquids. Since both flow meters 21a and 22a independently measure the integrated flow rates of the isocyanate compound-containing liquid, the polyol compound, and the foaming agent-containing liquid, the operator can always check the mixing ratio of both the containing liquids. As a result, the operator can change the amount of liquid fed by both the pressure feed pumps 21 and 22 as necessary, so that an accurate mixing ratio can always be maintained during the backfill injection construction.

  Thus, according to the injection device 1, since both the pressure of the compressed air and the flow rate of the two liquids are measured, and when they reach or exceed a predetermined value, the injection can be automatically stopped, An excessive amount of foamed polyurethane is not filled in the cavity 73. Therefore, there is no fear of fire due to the heat generated by the polyurethane foam, and the lining concrete is damaged due to excessive high pressure in the cavity 73. The polyurethane raw material liquid is not scattered. As a result, for example, the back-filling injection can be performed on the cavity 73 formed on the back of the lining while the road tunnel is in service.

FIG. 3 shows a schematic partial cross-sectional front view of the drug induction composite tube 10. An inner tube 11 e having a smaller diameter than that of the main drug delivery tube 11 is fixed coaxially with the main drug delivery tube 11. The inner tube 11e has a distal end opening 11e ₁ on one end, the distal end opening 11e ₁ discharges an isocyanate compound-containing solution fed through the main tube 41 which is connected to the other end. The tip opening 11e ₁ is located between the tip 11a and the branch part 11d. Between the tip port 11e ₁ and the tip 11a, the isocyanate compound-containing liquid and the polyol compound and the blowing agent-containing liquid that have flowed into the drug main delivery tube 11 from the branching part 11d are mixed and stirred, and mixed together. The stirring part is 11 g.

  The injection tube 14 is inserted into a hole 74 formed in the lining concrete 71, and the tip of the injection tube 14 reaches the cavity 73. A gap between the outer peripheral surface of the injection pipe 14 and the wall surface of the hole 74 is closed by a sealing material 75 such as waste cloth or caulking agent. Thereby, the foamed urethane raw material liquid injected into the cavity 73 does not leak from the hole 74 in which the injection pipe 14 is inserted.

The operation of the drug induction composite tube 10 when the drug is discharged from the injection tube 14 will be described. The ball valves 11f, 12a, and 13c are opened, and the drug main feed pipe 11, the drug sub-feed pipe 12, and the air introduction pipe 13 are opened. Through the inner tube 11e agents main flue 11, the isocyanate compound-containing liquid is ejected from the tip end opening 11e _1. The polyol compound and the foaming agent-containing liquid sent through the medicine sub-feed pipe 12 flow into the medicine main feed pipe 11 from the branch part 11d. Further, the compressed air sent through the air introduction pipe 13 flows into the drug main feed pipe 11 from the connection portion 11 c and flows toward the injection pipe 14.

And the compressed air and the polyol compound and the blowing agent-containing solution, since it is impingement mixing before reaching the distal opening 11e _1, polyol compounds and the blowing agent-containing liquid contains a large amount of particulate air. When the polyol compound containing air and the foaming agent-containing liquid reach the tip end 11e ₁ , they are combined with the isocyanate compound-containing liquid discharged from the mixture by the mixing and stirring unit 11g, and both are mixed and stirred. Thereby, a foamed polyurethane raw material liquid containing a large amount of air is prepared. Therefore, the foamed polyurethane produced from this foamed polyurethane raw material liquid has a high expansion ratio. Thereby, since the foamed polyurethane raw material liquid required to fill the cavity 73 without gaps is small as compared with the prior art, the cost of backfilling injection can be reduced.

  The foamed polyurethane raw material liquid is sent to the injection pipe 14 by the compressed air introduced from the air introduction pipe 13 to the medicine main feed pipe 11 and the pressures of the two pressure feed pumps 21 and 22 (see FIG. 1), and from its discharge port. It is injected into the cavity 73. Immediately after the injection, the polyurethane foam is generated while expanding due to the chemical reaction of the polyurethane foam raw material liquid, and this gradually fills the cavity 73.

  Examples of the isocyanate compound contained in the isocyanate compound-containing liquid for preparing the foamed polyurethane raw material liquid include polymethylene polyphenyl isocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, and / or isophorone diisocyanate. . In addition, as a polyol compound contained in the polyol compound-containing liquid, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, trimethylolpropane, 1,2,6-hexanetriol , Polyol compounds obtained by polyaddition reaction by allowing ethylene oxide, propylene oxide and / or butylene oxide to act on one or more selected from sorbitol and sucrose.

As a blowing agent, water; hydrofluoroolefins such as trichloromonofluoromethane, trichlorotrifluoroethane, CHF ₃ , CH ₂ F ₂ , CH ₃ F, trans-1-chloro-3,3,3-trifluoropropene; Hydro such as dichloromonofluoroethane, chlorodifluoromethane, 1-chloro-1,1-difluoroethane, 1,1,1,3,3-pentafluoropropane, 1,1,1,3,3-pentafluorobutane A chlorofluorocarbon compound is mentioned. The blowing agent is preferably contained in the polyol compound-containing liquid.

  The polyol compound and the foaming agent-containing liquid may contain a curing agent that accelerates curing of the foamed polyurethane and a filler that increases the strength thereof. Specific examples of such a curing agent include amine-based catalysts such as triethylamine, triethanolamine, diethanolamine, triethylenediamine, and tetramethylhexamethylenediamine and / or organometallic catalysts such as dibutyltin dilaurate. Moreover, colloidal silica is mentioned as a preferable filler.

  Curing agents include foamed polyurethane raw materials that produce foamed polyurethane, sodium silicate, mortar, bentonite mortar, air milk, air mortar, grout, polymer cement, epoxy resin, and silica resin (sodium silicate and diphenylmethane diisocyanate). Mixture) can be used. In the case of using a curable drug that does not require mixing of a plurality of types of raw material liquids, the injection device 1 has a drug subfeed pipe 12, a sub pumping pump 22, a sub tube 42, a raw material supply tube 45, and a sub tank 52. It does not have to be.

  FIG. 4 shows a schematic partial cross-sectional side view in the middle of performing the injection method using the injection apparatus 1. This figure shows a backfilling injection method in which a hollow portion 73 formed between the back surface of the lining concrete 71 of the road tunnel 70 and the natural ground 72 is filled with foamed polyurethane.

The injection device 1 does not include the wireless transmission unit 13 b ₂ , and the pressure sensor 13 b ₁ and the switch unit 24 of the pump controller 23 are electrically connected by a cable 46. Therefore, the switch unit 24 does not have the wireless reception unit 24a. The pressure sensor 13b ₁ and the pressure storage unit 24b ₁ are connected by a wired transmission unit, a wired reception unit (not shown), and wired via a cable 46.

  First, a plurality of holes 74a, 74b, and 74c are formed on the top surface of the lining concrete 71 with a drill from the inside of the road tunnel 70 toward the cavity 73. The volume of the cavity 73 is measured by inserting a scale from the holes 74 a, 74 b, 74 c or irradiating ultrasonic waves along the surface of the lining concrete 71. Based on this measured value, the injection amount of the foamed polyurethane raw material liquid is calculated and determined. Further, the amount of the isocyanate compound-containing liquid and the amount of the polyol compound and the blowing agent-containing liquid required to prepare this injection amount of the foamed polyurethane raw material liquid are calculated, and the upper limit values of these amounts are determined.

  The injection operator 83 and the pump operator 84 connect both the pressure-feed pumps 21 and 22 of the pump unit 20 loaded on the equipment loading vehicle 82 and the drug main feed pipe 11 and the drug sub-feed pipe 12 of the drug guide composite pipe 10. The main tube 41 and the sub tube 42 are connected to each other. Further, both workers 83 and 84 are connected temporarily to both pumps 21 and 22 and both tanks 51 and 52 by raw material supply tubes 44 and 45, respectively, and are temporarily installed outside the tunnel of the air introduction pipe 13 and the road tunnel 70. The air compressor 30 is connected by an air tube 43. Further, the isocyanate compound-containing liquid is put into the main tank 51, and the polyol compound and the foaming agent-containing liquid are put into the sub tank 52, respectively.

The pump operator 84 has a threshold value that is the maximum allowable differential pressure between the pressure at the start of drug injection and the injection pressure during drug injection, the upper limit value of the isocyanate compound-containing liquid amount determined by calculation, the polyol compound, and The upper limit value of the amount of the foaming agent-containing liquid is input to both storage units 24b ₁ and b ₂ of the switch unit 24 (see FIG. 2).

  The injection worker 83 closes all the ball valves 11f, 12a, and 13c of the drug guide composite tube 10 and gets into the bucket 81a of the aerial work vehicle 81 together with the drug guide composite tube 10. The bucket 81 a is raised to the vicinity of the top surface of the lining concrete 71. Next, the injection operator 83 inserts the injection tube 14 of the drug induction composite tube 10 into the hole 74a, and is attached to the adhesive or the injection tube 14 so that the injection tube 14 does not come out of the hole 74a. The drug induction composite pipe 10 is fixed by a fall prevention ring inserted into the cavity 73 and applied to the opening of the hole 74a on the back surface of the lining concrete 71, and a waste or caulking agent is placed in the gap between the injection pipe 14 and the hole 74a. Such a sealing material 75 is filled, and this gap is closed so that the foamed polyurethane raw material liquid injected into the cavity 73 does not leak. Note that it is preferable to use waste as the sealing material 75 and insert the injection tube 14 into the hole 74a while filling the waste.

  Thereafter, the injection worker 83 opens the ball valve 13c of the air introduction pipe 13, and visually confirms that the value indicated by the Bourdon pipe 13a is less than 0.20 MPa. Further, the injection operator 83 opens the ball valve 11f of the drug main feed pipe 11 and the ball valve 12a of the drug sub-feed pipe, and verbally instructs the pump operator 84 to start injection of the foamed polyurethane raw material liquid. The pump operator 84 operates the manual switch of the pump controller 23 to operate both the pressure-feed pumps 21 and 22. Thereby, the isocyanate compound-containing liquid and the polyol compound and the foaming agent-containing liquid are sent to the drug induction composite tube 10 at a flow rate of, for example, 2 to 10 L / min, preferably 3 to 6 L / min. Thereby, the isocyanate compound-containing liquid, the polyol compound and the foaming agent-containing liquid are mixed and stirred together with the compressed air introduced by the air introduction pipe 13 in the mixing and stirring unit 11g in the medicine main feed pipe 11 to prepare a foamed polyurethane raw material liquid. Is done. This foamed polyurethane raw material liquid is injected into the cavity 73. The foamed polyurethane raw material liquid flows and spreads radially on the lining concrete 71 in the cavity 73 around the hole 74a, and cures while foaming / expanding to produce foamed polyurethane. The cavity 73 is gradually filled with this polyurethane foam.

The pressure of the compressed air measured in the air introduction pipe 13 varies for 0.5 to 2 minutes immediately after the start of injection. When the pressure measured by the pressure sensor 13b ₁ is stabilized within a range of ± 0.02 MPa, for example, the pressure storage unit 24b ₁ acquires the median value of this range from the pressure sensor 13b ₁ via the cable 46, and injects the pressure. Hold as starting pressure. Foam during injection of the polyurethane raw material solution sequentially a differential pressure between the transmitted pressure value and the injection start pressure held in the pressure storage unit 24b ₁ of the compressed air is calculated calculating unit 24c is, each time the pressure determination unit 24d ₁ Is compared with the threshold value stored in the pressure storage unit 24b ₁ to determine whether the differential pressure has reached or exceeded the threshold value (see FIG. 2).

  The pump operator 84 monitors the meter indicating the total amount of the isocyanate compound-containing liquid, the polyol compound and the foaming agent-containing liquid and the total amount of the foamed polyurethane raw material liquid to be injected during the injection of the foamed polyurethane raw material liquid. When it is confirmed that the remaining amount has reached a predetermined value, for example, 5 kg, it is preferably transmitted to the injection worker 83. Thereby, the injection operator 83 recognizes that the injection of the foamed polyurethane raw material liquid should be finished soon.

  The injection device 1 is a flow rate calculation unit that calculates the difference between the total amount to be injected and the integrated flow rate measured by both flow meters 21a and 22a, and determines that this difference has reached or falls below a predetermined remaining amount. By having a flow rate determination unit and a sound generator such as a buzzer that generates a sound by this determination (not shown), the injection worker 83 is automatically informed that the injection of the foamed polyurethane raw material liquid is about to end. It may be a notification.

When it is determined by the pressure determination unit 24d ₁ of the switch unit 24 that the differential pressure has reached or exceeded the threshold value, the output unit 24e sends an electrical signal to stop the operation of both the pumps 21 and 22 in response to the stop switch 24f. The stop switch 24f cuts off the power supply to both the pressure-feed pumps 21 and 22 and stops their operations. Thereby, the injection of the foamed polyurethane raw material liquid automatically ends.

  The injection operator 83 closes the ball valve 11f of the medicine main feeding pipe 11 and the ball valve 12a of the medicine auxiliary feeding pipe 12 while the ball valve 13c of the air introduction pipe 13 is opened. As a result, the foamed polyurethane raw material liquid, the isocyanate compound-containing liquid, and the polyol compound and the foaming agent-containing liquid remaining in a small amount in the drug induction composite pipe 10 are discharged from the drug induction composite pipe 10, and the residual and backflow of these liquids The drug induction composite tube 10 is prevented from being clogged, or foamed polyurethane is generated in the drug induction composite tube 10 and the drug induction composite tube 10 is ruptured. Thereafter, the pump operator 84 stops the operation of the air compressor 30, and the injection operator 83 closes the ball valve 13c.

  The injection worker 83 removes the injection tube 14 from the main drug delivery tube 11, and bends the injection tube 14 or closes its opening so that the injected and unreacted foamed polyurethane raw material liquid does not leak, Curing foamed polyurethane. These operations are performed for all of the holes 74a, 74b, and 74c. Since the foamed polyurethane raw material liquid is injected through the plurality of holes 74a, 74b, 74c and flows radially, for example, the hole 74a is formed between the polyurethane foam generated by injection from the hole 74a and the wall surface of the cavity 73. Even if a gap exists at the time of completion of injection from the above, the foamed polyurethane raw material liquid flows into this gap by injection from another hole 74b adjacent to the hole 74a, and foamed polyurethane is generated. Therefore, the cavity 73 can be filled with foamed polyurethane without leaving such a gap. In this way, the backfill injection work is completed.

  The injection method of the present invention is not limited to the cavity on the back of the tunnel lining as shown in FIG. 4, but also the cavity under the foundation of the building and the cavity formed by a partial defect in the building structure, as well as the abandoned mine, waterway, and air defense fence. And, it can be suitably used for closing a horizontal shaft such as a lifeline buried shaft. The lifeline buried mine refers to a horizontal pit that accommodates lifelines such as water and sewage pipes, power transmission lines, gas pipes, and communication lines exemplified by telephone lines and optical lines, and is buried in the ground.

  The Example which filled the foaming polyurethane in the cavity using the injection | pouring method of this invention, and the comparative example using the injection | pouring method which does not apply this invention are shown.

Example 1
A mold, which is a rectangular parallelepiped sealable container having an internal dimension of length × width × height = 1000 × 1000 × 300 mm (volume: 0.3 m ³ ), was prepared. An injection hole similar to the drilling hole drilled in the lining concrete was opened on the side of the mold. The mold was sealed and placed on a horizontal floor (tilt angle 0 °). The calculated injection amount, which is the amount of the polyurethane foam raw material liquid to be injected, calculated based on the volume of the mold, was 8.85 kg.

The pressure storage unit 24b ₁ of the switch unit 24, and inputs the threshold value of 0.09 MPa. Commercially available isocyanate compound-containing liquid and polyol compound and foaming agent-containing liquid capable of preparing a foamed polyurethane raw material liquid that produces foamed polyurethane foamed 40 times (standard: 40 ± 4 times) are respectively stored in the main tank 51 and the sub tank 52. I put it in. After the injection tube 14 was inserted into the injection hole of the mold, the injection device 1 was operated, and the foamed polyurethane raw material liquid was injected into the mold at 7 kg / min. When 0.5 kg of both contained liquids were fed, the pressure of the compressed air measured by the pressure sensor 13b ₁ was continued within 0.05 ± 0.01 MPa for 10 seconds. The pressure determination unit 24d ₁ of the switch unit 24 determines this 0.05MPa as the initial pressure, the pressure storage unit 24b _1, it was confirmed that stores the initial pressure.

  When the pressure of the compressed air flowing through the air introduction pipe 13 reached the initial pressure +0.09 MPa, the operations of the two pumps 21 and 22 were stopped, and the injection of the polyurethane foam raw material liquid was stopped. Both ball valves 11f and 12a were immediately closed and each liquid remaining in the drug induction composite tube 10 was discharged with compressed air, and then the ball valve 13c of the air introduction tube 13 was closed. The actual injection amount of the foamed polyurethane raw material liquid calculated based on both flow meters 21a and 22a was 11.5 kg, and the injection amount magnification, which is the ratio of the actual injection amount to the calculated injection amount, was 1.3.

  The lid of the mold was opened and the polyurethane foam in the mold was visually observed. An appearance photograph of the result of Example 1 is shown in FIG. As shown in the figure, the polyurethane foam was filled in the mold with almost no gap.

  This foamed polyurethane was taken out of the mold. A sample was prepared by cutting out the center portion of the foamed polyurethane into a predetermined size so as not to include a skin layer as a surface layer of the foamed polyurethane. The density of the polyurethane foam sample was calculated based on the outer dimensions and weight of the sample. When the ratio of the density of the foamed polyurethane raw material liquid to the density of the sample was calculated to calculate the expansion ratio, it was 39.7 times.

(Example 2)
The same operation as in Example 1 except that a concrete block was placed between this and the floor along one side forming the bottom of the mold, the mold was inclined by 30 °, and the threshold was set to 0.05 MPa. did. As a result, the polyurethane foam was filled in the mold with almost no gap. Further, the amount of injection was 11.5 kg, the injection ratio was 1.3, and the foaming ratio was 39.0 times.

(Example 3)
The same operation as in Example 1 was performed except that the threshold value was 0.17 MPa. As a result, the polyurethane foam was filled in the mold with almost no gap. The actual injection amount was 17.5 kg, and the injection magnification was 2.0 times. The expansion ratio was 32.6 times, which was slightly lower than the standard ratio of 40 times.

(Comparative Example 1)
The operation was performed in the same manner as in Example 1 except that the injection was stopped when the calculated injection amount of the foamed polyurethane raw material liquid reached 8.85 kg without setting the threshold. An appearance photograph of the result of Comparative Example 1 is shown in FIG. As shown in the figure, a gap between the inner wall of the mold and the polyurethane foam and cracking of the polyurethane foam were observed. This indicates insufficient injection of the foamed polyurethane raw material liquid. The injection ratio was 1.0 times and the foaming ratio was 41.6 times. During construction, the pressure of the compressed air measured by the pressure sensor 13b did not increase from the initial pressure, and the pressure difference between the pressure just before stopping the injection and the initial pressure was 0.00 MPa.

(Comparative Example 2)
The operation was performed in the same manner as in Example 1 except that the injection was stopped when the pressure of the compressed air rose by 0.24 MPa from the initial pressure without setting a threshold. As a result, the polyurethane foam was filled in the mold with almost no gap. However, some of them were crushed and wrinkles were observed on the surface, indicating excessive injection of the polyurethane foam raw material liquid. Moreover, the implementation injection amount was 26.5 kg. The injection magnification reached 3.0 times, and the expansion ratio was reduced to 24.7 times, which is approximately 60% of the standard 40 times.

The results of Examples 1 to 3 and Comparative Examples 1 and 2 are summarized in Table 1. In the evaluation column, ◎, ○, Δ, and x are as follows.
◎: The inside of the mold is completely filled and the expansion ratio is within the standard value range (40 ± 4 times). ○: The inside of the mold is completely filled and the decrease in the expansion ratio is below the standard lower limit. One of them
△: The mold was filled except for the square, and the expansion ratio was within the standard value range. X: The decrease in the expansion ratio was less than the standard lower limit. More than 10% of

  According to Examples 1 to 3, there was almost no gap between the inner wall surface of the mold and the polyurethane foam, and the mold was filled with the polyurethane foam. In particular, the expansion ratios of Examples 1 and 2 were within the standard, and the injection ratio was 1.3, and the difference between the actual injection amount and the calculated injection amount was extremely small. As described above, it was found that the backfill injection work can be performed appropriately and reliably by setting a threshold value of 0.20 MPa at the maximum from the initial pressure of the compressed air.

  On the other hand, in Comparative Example 1 in which the foamed polyurethane raw material liquid was injected only depending on the injection amount, the pressure did not increase and the inside of the mold could not be filled. From this, it was found that the backfilling injection method that injects the curable drug only depending on the injection amount has a very high possibility that the cavity cannot be filled with the curable drug. Further, in Comparative Example 2 in which the injection of the polyurethane raw material liquid was continued until the initial pressure + 0.24 MPa was reached, the injection ratio was 3.0 times, and the foaming ratio was about 25 times, which is much lower than 40 times the standard. Therefore, it was found that excessive injection was caused when the pressure of the compressed air exceeded 0.20 MPa from the initial pressure.

  The injection apparatus and the injection method using the same according to the present invention include a cavity under a building foundation and a cavity formed by a partial defect in a building structure, as well as an abandoned mine, a waterway, an air raid, and a lifeline buried mine. It is used to close such horizontal shafts.

DESCRIPTION OF SYMBOLS 1 is an injection | pouring apparatus, 10 is a chemical | medical agent induction compound pipe, 11 is a chemical | medical agent main delivery pipe | tube, 11a is a front-end | tip, 11b is a base end, 11c is a connection part, 11d is a branch part, 11e is an inner pipe | tube, 11e ₁ is a front end port, 11f is a ball valve, 11g is a mixing and stirring unit, 12 is a medicine sub-feed pipe, 12a is a ball valve, 13 is an air introduction pipe, 13a is a Bourdon pipe, 13b is a pressure sensor unit, 13b ₁ is a pressure sensor, and 13b ₂ is wireless. Transmitter, 13c is a ball valve, 14 is an injection pipe, 20 is a pump unit, 21 is a main pump, 21a is a main flow meter, 22 is a sub pump, 22a is a sub flow meter, 23 is a pump controller, 24 is a switch Unit, 24a is a wireless receiving unit, 24b ₁ is a pressure storage unit, 24b ₂ is a flow rate storage unit, 24c is a calculation unit, 24d ₁ is a pressure determination unit, 24d ₂ is a flow rate determination unit, 24 e is an output section, 24f is a stop switch, 30 is an air compressor, 41 is a main tube, 42 is a sub tube, 43 is an air tube, 44 and 45 are raw material supply tubes, 46 is a cable, 51 is a main tank, 52 is a sub tank , 70 is a road tunnel, 71 is lining concrete, 72 is a natural ground, 73 is a cavity, 74, 74a, 74b and 74c are drilled holes, 75 is a sealing material, 81 is an aerial work vehicle, 81a is a bucket, 82 Is an equipment loading vehicle, 83 is an injection operator, and 84 is a pump operator.

Claims (10)

An injection device for a curable drug selected from a curable filler injected into a cavity and a raw material thereof,
Connected to the main tube connected at the base end to the main pumping pump that pressurizes and sends out the curable drug, and connected to the injection tube inserted into the cavity at the distal end,
The connecting portion provided on the tube wall of the drug main feed pipe communicates in an airtight manner and introduces compressed air from an air compressor into the drug main feed pipe while stirring the curable drug into the injection pipe. An air introduction pipe to be fed;
The pressure of the compressed air that is attached to the air introduction pipe and rises according to the degree of injection and / or hardening of the curable drug is communicated to the injection pipe that discharges the curable drug. at the air inlet pipe, a pressure sensor for measuring,
A pressure determination unit that determines that the difference in pressure between the start of injection of the curable drug and the injection thereof has reached or exceeded a threshold value, and the operation of the pressure pump according to the determination of the pressure determination unit. An injection apparatus comprising: an output unit that outputs a stop signal; and a switch unit that includes a switch that receives the signal and stops the operation.   The branch part between the tip and the connecting part communicates with the medicine main feeding pipe and is connected to a sub tube connected to a sub pumping pump that pressurizes and feeds a sclerosing medicine different from the sclerosing medicine. The injection device according to claim 1, further comprising a medicine auxiliary delivery tube.   The main flow meter that integrates the flow rate of the curable drug, the sub flow meter that integrates the flow rate of the different curable drug, and at least one integrated value measured by the main flow meter and the sub flow meter is an upper limit value. A flow rate determination unit that determines whether the flow rate has reached or exceeded, and the output unit outputs a signal for stopping the operation of the main pumping pump and the sub pumping pump according to the determination of the flow rate determination unit The injection device according to claim 2.   The drug main feed pipe has an inner pipe that is fixed in the interior thereof and allows the curable drug to flow therethrough, and the distal end of the inner pipe is located between the distal end and the branch portion. The injection device according to claim 2 or 3, wherein   The raw material of the curable filler, which is a polyurethane foam, is an isocyanate compound-containing liquid sent by the drug main feed pipe, and a polyol compound-containing liquid and a foaming agent sent by the drug sub-feed pipe. The injection device according to any one of claims 2 to 4.   The injection according to any one of claims 1 to 5, further comprising: a calculation unit that calculates the pressure difference; and a storage unit that stores the pressure and the threshold value at the start of the injection. apparatus.   7. The apparatus according to claim 1, further comprising: a transmitting unit that transmits the pressure value measured by the pressure sensor as an electric signal in a wired or wireless manner; and a receiving unit that receives the electric signal. The injection device according to any one of the above.   The injection device according to any one of claims 1 to 7, wherein the threshold value is 0.05 to 0.20 MPa.   The said hollow part selected from the cavity of a tunnel lining back surface, the cavity under a building foundation, the cavity in a building structure, and a side pit using the injection apparatus in any one of Claim 1 to 8 is said hardening | curing. An injection method comprising filling with a cured product of a sex medicine.   The injection method according to claim 9, wherein the horizontal shaft is selected from an abandoned mine, a waterway, an air defense pit, and a lifeline buried mine.