Cavity repair method for tunnel and injection equipment used therefor

Abstract

To provide a cavity repair method for a tunnel and injection equipment used therefor.SOLUTION: A tunnel cavity repair method comprises: connecting a tip part of a hose 61 of injection equipment for cavity repair, in which a base end of the hose 61 is connected to a fluid outlet of a mixing injector 5, a first heater 26 with a heating regulator is installed on a first pipe 21 connecting a first tank 1 for polyol component liquid and the mixing injector 5, and a second heater 46 with a heating regulator is installed on a second pipe 41 connecting a second tank 3 for isocyanate component liquid and the mixing injector 5, to a nozzle 7 whose tip opening is arranged in a cavity C to be filled with urethane foam; heating by using the heating regulator with the second heater 46 and / or the first heater 26; after adjusting the temperature of the isocyanate component liquid and / or the polyol component liquid to be put into the mixing injector 5; discharging, through the hose 61, a reaction progress fluid g1 obtained by mixing the polyol component liquid and the isocyanate component liquid in the mixing injector 5, from the tip opening of the nozzle 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tunnel cavity repair method for filling a cavity that occurs between the back surface of a tunnel lining and the natural ground, and to an injection facility used for this method. [Background technology]

[0002] In tunnels, a cavity C as shown in Fig. 9 may occur between the back surface of the tunnel lining and the natural ground. If this cavity C is left as it is, there is a risk that uneven loads will occur locally in the lining concrete R, causing deformation. Therefore, a backfill injection method for tunnels has been proposed in which a filler is injected into the cavity C, filling it with the filler, and eliminating the uneven load (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4909444 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0004] As described in claim 1 of Patent Document 1, "...a tunnel backfill injection method, characterized in that, when injecting a filler from an injection hole in a lower row to an injection hole in a higher row among the plurality of injection holes, a fixed amount of filler is injected into the injection holes in the lower row other than the injection hole in the top end portion, and the filler is pressure-injected only into the injection hole in the top plate portion, thereby injecting the filler into almost the entire cavity." In this embodiment, urethane foam is used as the filler.

[0005] However, when urethane foam is used as the filler, the reaction speed between the polyol component and isocyanate component of the urethane foam raw material varies greatly depending on the temperature conditions of the repair area, such as seasonal factors. The reaction speed tends to be faster in summer, and slows down when the temperature drops in winter. Therefore, even if a fixed amount of filler is injected into the injection hole, the reaction speed is slow in winter, so the amount of filler used will be greater than the amount actually required in summer. In particular, when high-pressure injection is performed using a high-pressure stirring injection machine, if the reaction speed is slow, the filled space will remain until a later time, resulting in overfilling. And since the amount of filler increases, the amount used will also increase, so if expensive urethane foam is used as the filler, there is a problem that the cost of cavity repair work will be unnecessarily high. Furthermore, when filling cavity C with urethane foam using a low-pressure mixing device, the mixing and stirring of the urethane foam may be insufficient compared to when a high-pressure mixing and injection machine is used, which may affect the quality.

[0006] The present invention has been made to solve the above problems, and aims to provide a tunnel cavity repair method and injection equipment used therefor, which stabilizes the amount of foamed urethane filled into the cavity by injecting temperature-controlled urethane foaming raw material into the cavity, even if the temperature of the repair area changes due to seasonal air temperature differences. [Means for solving the problem]

[0007] In order to achieve the above object, the gist of the invention is a tunnel cavity repair method for filling cavities that have occurred between the tunnel lining concrete and the natural ground, characterized in that a first heater with a heating regulator is installed on a first piping connecting a first tank for a polyol component liquid and a stirring injector, and a second heater with a heating regulator is installed on a second piping connecting a second tank for an isocyanate component liquid and a stirring injector, and the tip of a hose of a cavity repair injection equipment having a base end connected to the fluid outlet of the stirring injector is connected to a nozzle having a tip port disposed in the cavity to be filled with urethane foam, and the second heater and / or the first heater are used to heat the isocyanate component liquid and / or polyol component liquid entering the stirring injector, and then the reaction-progressing fluid obtained by mixing the polyol component liquid and the isocyanate component liquid in the stirring injector is discharged from the tip port of the nozzle through the hose using the heating regulator. The gist of the present invention is an injection equipment for repairing a tunnel cavity, which fills a cavity that occurs between the tunnel lining concrete and the natural ground, comprising: an agitating injector; a first pipe connecting the agitating injector and a first tank for storing a polyol component liquid; a first heater with a heat adjuster attached to the first pipe; a second pipe connecting the agitating injector and a second tank for storing an isocyanate component liquid; a second heater with a heat adjuster attached to the second pipe; and a hose connecting a fluid outlet of the agitating injector and a nozzle having a tip end disposed in the tunnel cavity, wherein the isocyanate component liquid or / and the polyol component liquid are heated and adjusted by the second heater and / or the first heater using the heat adjuster, and the reaction proceeding fluid mixed by the agitating injector is discharged from the tip end of the nozzle through the hose. Effect of the Invention

[0008] The tunnel cavity repair method and injection equipment of the present invention can fill the cavity with an appropriate amount of urethane foam without being affected by the seasons by controlling the temperature of the urethane foaming raw material injected into the cavity. Even in the cold winter months, the amount of urethane foam used is not large, reducing cavity repair work costs and providing excellent results. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a partial cross-sectional explanatory diagram showing one embodiment of the tunnel cavity repair method and the injection equipment used therein of the present invention, showing the injection equipment installed. [Diagram 2] 2 is a partial cross-sectional explanatory view showing how a reaction-promoting fluid of the foaming raw material is discharged from the nozzle of FIG. 1. [Diagram 3] FIG. 3 is a partial cross-sectional explanatory view of a gradient hardened portion formed of urethane foam resulting from hardening of the reaction-promoting fluid in FIG. 2. [Figure 4] FIG. 2 is an explanatory cross-sectional view of a mixing and stirring unit of a high-pressure stirring and injection machine. [Diagram 5] FIG. 2 is an explanatory cross-sectional view of a mixing and stirring unit of a high-pressure stirring and injection machine. [Figure 6] FIG. 4 is a cross-sectional view of the tunnel and its surroundings for discharging a reaction proceeding fluid to the top of the cavity after the inclined hardened portion in FIG. 3 is formed. [Figure 7] FIG. 7 is a cross-sectional view of the reaction-promoting fluid filling the top of the cavity of FIG. 6 after it has hardened. [Figure 8] 4 is a control flowchart of a control circuit in one embodiment of the present invention. [Figure 9] This is an explanatory cross-sectional view showing a cavity occurring behind the lining concrete. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The tunnel cavity repair method and the injection equipment used therefor according to the present invention will be described in detail below. Figures 1 to 8 show one embodiment of the tunnel cavity repair method (hereinafter also simply referred to as the "cavity repair method") and the injection equipment used therefor. Figure 1 is an explanatory diagram of the injection equipment installed at the cavity, Figure 2 is an explanatory diagram of the ejection of the reaction-progressing fluid of the foaming raw material from the nozzle of Figure 1, Figure 3 is an explanatory diagram of the formation of the gradient hardening part of the foamed urethane, Figures 4 and 5 are cross-sectional views of the mixing and stirring part of the high-pressure stirring and injection machine, Figure 6 is a cross-sectional view of the ejection of the reaction-progressing fluid to the top of the cavity after the formation of the gradient hardening part of Figure 3, Figure 7 is a cross-sectional view of the reaction-progressing fluid filling the top of the cavity of Figure 6 after it has hardened, and Figure 8 shows a control flow chart of the control circuit in one embodiment of the present invention. Note that each figure is simplified and the essential parts of the invention are emphasized for ease of understanding. Parts that are not directly related to the present invention are omitted.

[0011] The tunnel cavity repair method is to fill the cavity C, which occurs between the tunnel lining concrete R and the ground S as shown in Figure 9, with rigid urethane foam 9. The rigid urethane foam 9 filling the cavity C is formed from a polyol component liquid 1a (hereinafter also referred to as "liquid A") containing a polyol component for two-component polyurethane resin, and an isocyanate component liquid 3a (hereinafter also referred to as "liquid B") containing an isocyanate component. Liquid A contains a polyol consisting of, for example, both or one of polyether polyol and polyester polyol, a catalyst, a foaming agent, etc. Liquid B contains, for example, TDI prepolymer, crude TDI, polymeric MDI, various modified MDI, etc. A first heater 26 with a heating regulator 261 is installed on the first pipe 21 connecting the first tank 1 for liquid A and the stirring injector 5, while a second heater 46 with a heating regulator 461 is installed on the second pipe 41 connecting the second tank 3 for liquid B and the stirring injector 5. The tip of a hose 61 related to cavity repair injection equipment, the base end of which is connected to the fluid outlet of the stirring injector 5, is connected to a nozzle 7 with a tip port 70 disposed in the cavity C, to prepare for cavity repair. Then, the second heater 46 and / or the first heater 26 heat the liquid B and / or liquid A entering the stirring injector 5 to adjust the temperature, and then the liquid A and the liquid B are mixed in the stirring injector 5, and the resulting reaction proceeding fluid g1 is injected from the tip port 70 of the nozzle 7 into the cavity C, thereby carrying out a cavity repair method.

[0012] Prior to the cavity repair method, the injection equipment used therein will be described. The injection equipment includes an agitation injection machine 5, a first heater 26 with a heat regulator 261, a second heater 46 with a heat regulator 461, and a hose 61.

[0013] The stirring injector 5 is an injection device that mixes the polyol component liquid supplied from the first pipe with the isocyanate component liquid supplied from the second pipe and discharges the mixed reaction proceeding fluid from the injector outlet. In this embodiment, a high-pressure stirring injector is used. The high-pressure agitation injector 5 is well known, and in this embodiment, it is an injection gun that injects liquid A and liquid B with high discharge energy from small holes 510, 530 on the inner wall of the chamber 50, and the two liquids collide with each other to mix and blend (Fig. 4). Liquid A and liquid B are pumped from the first tank 1 and the second tank 3 to the high-pressure agitation injector 5 at high pressure by the high-pressure pump 25 of the first pipe 21 and the high-pressure pump 45 of the second pipe 41, respectively, which are provided upstream of the high-pressure agitation injector 5, as shown in Fig. 1. Compared to the injection pressure of the low-pressure mixer, which is 0.1 to 0.2 MPa, the high-pressure agitation injector 5 pressure-injects liquid A and liquid B into the chamber 50 with a high pressure of 7 to 9 MPa, causing them to collide. This is an agitation injector with excellent mixing ability. The pressurized A liquid (B liquid) passes through flow path 51 (53) of mixing / stirring section 5b, which is the main section, and is sprayed at high pressure into the cylinder from pores 510 (530) in chamber inner wall 500. The pores 510 for A liquid and the pores 530 for B liquid are inclined toward the cylindrical axis of chamber 50 from the ring-shaped flow path section that circles near the cylinder inner wall 500 to the pore openings in cylinder inner wall 500, and at this inclination angle, opposing A liquid and B liquid are ejected toward each other.

[0014] Explaining with reference to FIG. 4, when the lever 5a is pulled, the rod 57 retracts, the hole opening of the fine hole 530 that communicates with the chamber 50 opens, and the liquid B is sprayed from the flow path 53 into the cylindrical chamber 50. Further retraction of the rod 57 causes the rod head 571 to retract from the position of the fine hole 510. The hole opening of the fine hole 510 opens, and the liquid A is discharged and sprayed from the flow path 51 toward the liquid B that has already been sprayed. The collision of the liquid A and the liquid B produces efficient stirring and mixing. The stirred and mixed foaming raw material g becomes a reaction proceeding fluid g1, and flows through the hose 61 connected to the presser tube part 56 of the chamber 50 and the nozzle 7 toward the nozzle tip port 70. In this embodiment, the presser tube part 56 is the fluid outlet of the high-pressure stirring and injecting machine 5. On the other hand, when the pulled lever 5a is returned, the rod 57 advances in conjunction with this as shown by the outlined arrow in Fig. 5. By the advancement of the rod 57, the rod 57 blocks the respective openings of the fine hole 510 of the A liquid blowing hole and the fine hole 530 of the B liquid blowing hole, and the supply of the A liquid and the B liquid into the chamber 50 stops.

[0015] The first pipe 21 and the second pipe 41 are pipes that run from the first tank 1 and the second tank 3 to the high-pressure mixing injector 5 via the high-pressure pumps 25 and 45 (FIG. 1). Flow meters 29 and 49 that display and record the instantaneous flow rates and integrated flow rates of the A and B liquids passing through the pipes are attached midway through the first pipe 21 and the second pipe 41 on the discharge side of the high-pressure pumps 25 and 45, respectively. By attaching a first heater 26 with a heating regulator 261 and a second heater 46 with a heating regulator 461 to the first pipe 21 and the second pipe 41 from the first tank 1 and the second tank 3 to the flow meters 29 and 49, the A and B liquids passing through the pipes are heated and adjusted to a set temperature.

[0016] The first heater 26 with heat regulator 261 is attached to the first piping 21 that connects the high-pressure stirring injector 5 and the first tank 1 that stores the A liquid, and is a heater that controls the temperature of the A liquid flowing into the high-pressure stirring injector 5 with the heat regulator 261 (FIG. 1). The temperature of the reaction proceeding fluid flowing inside the first piping 21 detected by a thermocouple 262 is compared with a set temperature by the heat regulator 261, and the first heater 26 is changed to adjust the heating. The first heater 26 has a spiral fin-shaped flange 26b protruding from the surface of a heating rod 26a (a sheath heater in this case) with a large heat supply capacity, and is disposed inside the first piping 21. The flange 26b serves as a heat sink for the heating rod 26a, facilitating the transfer of heat to the liquid A passing through the first piping 21. The flange 26b also serves as a baffle plate, eliminating temperature unevenness in the liquid A reaction proceeding fluid as it passes through the first piping 21. In this embodiment, a first hose heater 22 with a temperature regulator 221 is attached to the first piping 21 from the flowmeter 29 to the high-pressure stirring injector 5. The first hose heater 22 has a heater portion wound around the outer periphery of the first piping 21 to keep the reaction proceeding fluid flowing through the first piping 21 warm. Based on the detection by the thermocouple 222, the temperature regulator 221 compares the temperature with a set temperature and changes the first hose heater 22 to keep the temperature warm. The first heater 26 is attached to the front stage of the first piping 21, and the first hose heater 22 is attached to the rear stage, but the first heater 26 may include the first hose heater 22, and the temperature of Liquid A may be controlled by the heat regulator 261.

[0017] The second heater 46 with the heating regulator 461 is attached to the second piping 41 connecting the high pressure stirring injector 5 and the second tank 3 storing the B liquid, and is a heater that controls the temperature of the B liquid flowing into the high pressure stirring injector 5 with the heating regulator 461. The temperature of the reaction proceeding fluid in the second piping 41 is detected by a thermocouple 462, and is compared with the set temperature by the heating regulator 461, and the second heater 46 is changed to adjust the heating. Like the first heater 26, the second heater 46 has a flange 46b protruding from a heating rod 46a and is disposed in the second piping 41. Like the first hose heater 22 with temperature regulator 221, the second heater 46 is provided with a second hose heater 42 with a temperature regulator 421. The second hose heater 42 is attached to the second piping 41 from the flowmeter 49 to the high-pressure stirring injector 5, and a heater portion for keeping the reaction proceeding fluid warm is wound around the outer periphery of the second piping to keep the reaction proceeding fluid flowing in the second piping 41 warm. Like the first hose heater 22 described above, the second heater 46 including the second hose heater 42 can control the temperature of Liquid B with the heat regulator 461. The heating regulators 261, 461 and the temperature regulators 221, 421 are provided with thermometers that display the A liquid temperature or B liquid temperature detected by the thermocouples 262, 462, 222, 422 in the first pipe 21 and the second pipe 41, respectively.

[0018] The hose 61 is a flexible pressure-resistant hose that connects the high-pressure agitation injection machine 5 and the nozzle 7. In cavity repair work, the nozzle 7 that injects foaming raw material g for rigid urethane foam into the cavity C is fixed to the lining concrete R before work. A plurality of nozzles 7, each with its tip disposed in the cavity C to be filled with rigid urethane foam 9, are attached in advance at necessary locations on the lining concrete R (FIGS. 1 to 3). The hose 61 connects the nozzle 7 to the high-pressure agitation injection machine 5, and guides the reaction-progressing fluid g1 of foaming raw material g, which is agitated and mixed with liquids A and B by the high-pressure agitation injection machine 5, to the nozzle tip port 70.

[0019] This embodiment further includes an air pipe 81. This is an air supply tube connected to the hose 61 downstream of the high-pressure stirring and injecting machine 5 (FIG. 1). The air pipe 81 is provided to enable the injection of air from an air compressor (not shown) into the hose 61 near the fluid outlet from the high-pressure stirring and injecting machine 5. Reference numeral 62 denotes a pressure gauge attached to the downstream side of the high pressure mixing injector 5 at the joint with the hose 61 immediately after the air pipe 81 is connected.

[0020] Using the above injection equipment, cavity repair is carried out, for example, as follows: Here, a repair method for filling a cavity C as shown in Fig. 9 with rigid urethane foam 9 will be described.

[0021] First, the entire injection equipment is transported by vehicle to the tunnel cavity repair site. The connection between the outlet of the high-pressure mixing injection machine 5 and the base end of the hose 61 is confirmed, and the tip of the hose is connected to the nozzle 7 located at the location of the cavity C to be filled with the rigid urethane foam 9. The nozzle 7 whose tip opening 70 is located at the slightly inclined portion C21 of the cavity side portion C2 extending from the approximately flat top C1 as shown in Figure 1 is connected first. Reference numeral 73 denotes the connection joint between the nozzle 7 and the hose 61. At the same time, a generator (not shown) is started, and the high-pressure pumps 25 and 45 are started, and the air compressor for supplying air to the air pipe 81 is operated and put into a standby state.

[0022] Then, the temperatures of the first heater 26 and the second heater 46 are set according to the temperature of the repair area, which is affected by the outside air temperature, etc. That is, the inflow temperature to the high-pressure mixing injector 5 is set and input by the heating regulators 261, 461. Specifically, the set temperature is determined according to the seasonal temperature drop of the repair area (the temperature of the concrete part or the ground inside the cavity in winter). The first heater 26 and the second heater 46 are heated and controlled so that the A liquid and the B liquid, which have been heated and adjusted, can be sent to the high-pressure mixing injector 5 from the first tank 1 and the second tank 3 through the first piping 21 and the second piping 41. Based on the input of the inflow temperature to the high-pressure stirring injector 5, the second heater 46 or / and the first heater 26 are heated and controlled to adjust the temperature of the B liquid in the second pipe 41 or / and the A liquid in the first pipe 21. In winter, the liquid temperature of the reaction proceeding fluid g1 discharged to the inclined portion C22 of the cavity side portion C2 and the cavity top portion C1 is made higher than the liquid temperature in summer to prevent the reaction rate of the urethane foam raw material from being slower than in summer. If the reaction rate of the urethane foam raw material is slower than in summer, the foaming and hardening rate is also slower. In addition, when the high-pressure stirring injector 5 is used, high-pressure injection is performed, so if the reaction rate is slow, the filling space remains until a later time, resulting in overfilling. Therefore, the amount of urethane foam raw material used is greater in winter than in summer. This increases the cost of cavity repair work, but by adjusting the temperature of the B liquid in the second pipe 41 or / and the A liquid in the first pipe 21, the cost of cavity repair work in winter can be prevented from increasing.

[0023] More specifically, the relationship between the liquid temperatures of Liquid A and Liquid B and CT (cream time), GT (gel time), and RT (rise time) is shown in Table 1, and the inlet temperature to the high pressure mixing injection machine 5 is determined based on this while taking into consideration the seasonal temperature of the repair area. This temperature is input using the heating regulators 261, 461. In this invention, CT refers to the foaming start time, GT refers to the resinification time when the resin starts to form threads, and RT refers to the time it takes for the foaming ratio to foam and expand to 40 times.

[0024] [Table 1]

[0025] Depending on the seasonal variation, the temperature of the liquid B in the second pipe 41 is set by the heating regulator 461 associated with the second heater 46, or the temperatures of the liquid B in the second pipe 41 and the liquid A in the first pipe 21 are set by the heating regulators 461, 261 associated with the second heater 46 and the first heater 26. Since the liquid A contains a foaming agent, it cannot be heated to a very high temperature. Therefore, when a certain temperature (30°C in this embodiment) is exceeded, only the temperature of the liquid B is increased. Here, as a specific example, we will explain the case where (a) the temperature of the repair area in summer is 20°C, and the case where (b) the temperature of the repair area in winter is 10°C.

[0026] (a) When the repair area is at 20°C First, connect the hose 61 to the nozzle 7 of the inclined portion C21 (FIG. 1), and input and set the inflow temperature of the liquid A to the high-pressure stirring and injector 5 to 30° C. using the heat regulator 261. Also, input and set the inflow temperature of the liquid B to the high-pressure stirring and injector 5 to 30° C. using the heat regulator 461.

[0027] The heating regulator 261 (461) has a control circuit, which is a heating control means having a built-in CPU, connected to the thermocouple 262 (462) and the first heater 26 (second heater 46). Each control circuit controls the supply of electricity to the first heater 26 and the second heater 46 based on the temperature signals of the thermocouples 262, 462 as shown in FIG. 8(A). 8(a) shows the heating control means for the reaction fluid passing through the first heater 26, in which the detection signal of the thermocouple 262 is read in step 101, and if the detected temperature is lower than the set value of 30°C in the following step 102, the first heater 26 is turned ON (step 103). On the other hand, if the detected temperature is 30°C or higher in the above step 102, the first heater 26 is turned OFF. Thus, by turning the first heater 26 ON and OFF at 30°C, the temperature of the reaction fluid in the first pipe 21 passing through the first heater 26 is kept at approximately the set value of 30°C. The second heater 46 is also set to the same setting value of 30°C as the first heater 26, and the first heater 26 is replaced by the second heater 46, the thermocouple 262 is replaced by the thermocouple 462, and the heat regulator 461 is controlled as shown in Figure 8 (a) to maintain the temperature of the reaction proceeding fluid in the second piping 41 passing through the second heater 46 at approximately the setting value of 30°C. The temperature regulators 221, 421 for keeping the temperature are also set to 30° C. in accordance with the settings of the heating regulators 261, 461, and liquids A and B at 30° C. are introduced into the high pressure mixing and injecting machine 5.

[0028] Next, a worker standing on deck D of the aerial work platform pulls the lever 5a. Then, liquids A and B are sprayed into the chamber 50 of the agitation injector, where they collide and mix. The temperature of the reaction proceeding fluid g1, a mixture of both liquids after leaving the high-pressure agitation injector 5, is about 30°C, and the reaction proceeding fluid g1 is discharged from the nozzle tip 70 (Figure 2). Incidentally, while the reaction proceeding fluid g1 is being discharged, a valve 82 of the air pipe 81 is opened to appropriately inject a small amount of air into the hose 61 from which the reaction proceeding fluid g1 exits the high-pressure agitation injector 5. This is to prevent cell roughness and to reduce the resistance to fluid flow through the hose 61. After the required amount of reaction-promoting fluid g1 has been discharged, lever 5a is returned to stop the flow of liquids A and B. As shown in Table 1, at a liquid temperature of 30°C for liquids A and B, the CT is 7 seconds and the RT is 64 seconds, ensuring a short reaction time. This prevents the foaming and curing from being accelerated and the amount of urethane foam raw material filled into inclined portion C21 from increasing. After forming the rigid urethane foam 9 in the inclined portion C21 on the right side of the paper in Figures 3 and 6, the hose 61 is similarly connected to the nozzle 7 in the inclined portion C21 on the left side of the paper, and the rigid urethane foam 9 is also formed in the inclined portion C21 on the left side of the paper in Figure 6.

[0029] Next, the tip of the hose 61 is transferred and connected from the nozzle 7 on the inclined portion C21 to the nozzle 7 provided at the top C1 of the cavity. A necessary amount of reaction proceeding fluid g1 is then discharged also to the top C1 of the cavity (FIG. 6), forming a rigid urethane foam 9 (FIG. 7). Both liquid A and liquid B are heated and adjusted to 30°C to fill the cavity with stable quality rigid urethane foam 9. In addition, the problem of insufficient mixing caused by low pressure foaming due to high pressure injection using a high pressure mixing injection machine is also solved, and the cavity repair work is completed with stable quality filled urethane foam.

[0030] We will also explain what happens in a different season, when the repair area is at 10°C in winter. (b) When the outside temperature is 10°C First, after connecting the hose 61 to the nozzle 7 of the inclined portion C21, the inflow temperature of liquid A to the high pressure stirring and injector 5 is set to 30°C by the heating regulator 261. The inflow temperature of liquid B to the high pressure stirring and injector 5 is set to 40°C by the heating regulator 461, which is higher than the 30°C setting of the heating regulator 261.

[0031] The case where the temperature is set to 30° C. in the heating regulator 261 is the same as the control shown in FIG. 8(a) of (a) described above, and therefore a description thereof will be omitted. On the other hand, in the case where the inflow temperature of the liquid B into the high-pressure mixing injector 5 is set to 40°C, the control circuit of the heating regulator 461 controls the power supply to the second heater 46 based on the temperature signal of the thermocouple 462 as shown in Fig. 8(b). This figure shows the heating control means for the reaction proceeding fluid passing through the second heater 46, in which the detection signal of the thermocouple 462 is read in step 201, and if the detected temperature is lower than the set value of 40°C in the following step 202, the second heater 46 is turned ON (step 203). On the other hand, if the detected temperature is 40°C or higher in the above step 202, the second heater 46 is turned OFF. In this way, the second heater 46 is turned ON and OFF at the boundary of 40°C, so that the temperature of the reaction proceeding fluid in the second pipe 41 passing through the second heater 46 is kept at approximately the set value of 40°C. The temperature regulator 221 for keeping warm is set to 30°C to match the input temperature of the heating regulator 261, and the temperature regulator 421 is set to 40°C to match the input temperature of the heating regulator 461, and liquid A at 30°C and liquid B at 40°C are introduced into the high-pressure stirring injector 5.

[0032] Next, an operator on deck D pulls lever 5a to inject liquid A and liquid B into chamber 50 of high-pressure agitation injector 5, causing them to collide and mix. As a result, the temperature of the reaction-promoting fluid g1, a mixture of the two liquids, after leaving high-pressure agitation injector 5 becomes higher than 30°C, and reaction-promoting fluid g1 at a higher temperature than in summer is discharged from nozzle tip opening 70 of inclined section C21. Air is appropriately injected into hose 61 while reaction-promoting fluid g1 is being discharged. After the required amount of reaction-promoting fluid g1 has been discharged, lever 5a is returned to stop liquids A and B. During filling, heat is taken from the tunnel lining concrete R and the ground S, but since reaction-promoting fluid g1 with a higher temperature than in summer is injected, the reaction speed approaches CT of 7 seconds and RT of 64 seconds in summer. After forming the rigid urethane foam 9 in the inclined portion C21 on the right side of the page in Figure 6, a hose 61 is connected to a nozzle 7 having a tip opening 70 in the inclined portion C21 on the left side of the page in the same manner, and a rigid urethane foam 9 is also formed in the inclined portion C21 on the left side of the page in Figure 6.

[0033] Next, the tip of the hose 61 is transferred and connected to the nozzle 7 provided at the top C1 of the cavity. Thereafter, the worker on deck D pulls lever 5a again to inject liquid A and liquid B into chamber 50 of high-pressure agitation injector 5, causing them to collide and mix. The reaction proceeding fluid g1 leaving the high-pressure agitation injector 5 is discharged from nozzle tip port 70 (Fig. 6). Thus, the top C1 of the cavity is filled with rigid urethane foam portion 91 with the desired expansion ratio (Fig. 7). After the required amounts of liquids A and B have been injected, lever 5a is returned to its original state. The cavity repair work is completed with cavity C filled with the desired urethane foam 9 with stable quality. In the figure, reference numeral 85 denotes an air flow, and reference numeral TN denotes the inside of a tunnel.

[0034] (3) Effects The tunnel cavity repair method and injection equipment used therein configured in this manner uses heating regulators 461, 261 to heat with second heater 46 and / or first heater 26, adjusts the temperature of liquid B and / or liquid A, and then high-pressure mixes liquid A and B in high-pressure mixing injection machine 5 to produce reaction-progressing fluid g1, so that rigid urethane foam 9 can be filled into cavity C with stable quality. As shown in Table 1, with regard to the formation of rigid urethane foam 9, which is greatly affected by slight differences in temperature in terms of CT, GT, RT, viscosity, etc., the reaction-progressing fluid g1 of foaming raw material g can be controlled to the desired temperature and injected into cavity C, so that urethane foam 9 with stable quality can be filled regardless of the season.

[0035] In some cases, foaming raw material g is used in summer and winter, but this makes it difficult to manage the raw materials such as polyol component liquid 1a and isocyanate component liquid 3a, and also makes it difficult to respond to subtle changes in outside temperature that vary from day to day. On the other hand, according to the present invention, the same raw material can be used throughout the year, facilitating inventory management. By providing the first heater 26 with the heating regulator 261 and the second heater 46 with the heating regulator 461, the polyol component liquid 1a and the isocyanate component liquid 3a can be adjusted and controlled to a predetermined temperature, and liquid A and liquid B can be reacted under appropriate temperature conditions in the high-pressure stirring and injecting machine 5. By changing the temperature settings of the isocyanate component liquid in the second pipe 41 and the polyol component liquid in the first pipe 21, the amount of urethane foam filled can be stabilized throughout the year, and the cavity C can be filled with rigid urethane foam 9 of constant good quality.

[0036] In addition, the present invention uses a high-pressure mixing and injection machine 5 with a pressure of about 7 to 9 MPa, which, unlike low-pressure mixing at 0.1 to 0.2 MPa, increases the degree of mixing and agitation of liquid A and liquid B, making it possible to promote a faster and more homogenous urethane reaction. Unlike low-pressure mixing equipment, there is no risk of insufficient mixing and agitation of the urethane foam, which could affect the quality.

[0037] As shown in Table 1, the reaction rate between liquid A and liquid B of urethane foam raw materials is easily affected by temperature, and the reaction between liquid A and liquid B slows down especially during the cold winter months as heat is absorbed from the tunnel lining concrete R and the ground S. If the RT is long, it takes longer to fill the cavity, and since injection continues during that time, the pack rate increases. In contrast, the present invention is equipped with a first heater 26 with a heating regulator 261 and a second heater 46 with a heating regulator 461, so that it can always fill cavity C with high-quality rigid urethane foam 9 that ensures the desired expansion ratio, regardless of the temperature of the repair area in summer or winter. By controlling the temperatures of liquids A and B, RT can be made to have the same temperature environment in summer and winter, preventing over-injection of foaming raw material g in winter. By filling an appropriate amount of urethane foam 9, there is no need to use excess, expensive foaming raw material g. Construction work can be carried out at a reasonable price.

[0038] Furthermore, since a pressure gauge 62 for measuring the pressure of the reaction proceeding fluid g1 is installed downstream of the high-pressure stirring injector 5, it is possible to know the pressure of the reaction proceeding fluid g1 itself close to the nozzle 7. It is also possible to accurately determine whether the reaction proceeding fluid g1 discharged from the nozzle tip 70 is at a predetermined pressure, and by checking not only the temperature but also the pressure, it is possible to fill the cavity C with rigid urethane foam 9 of more stable quality. As described above, the tunnel cavity repair method and the injection equipment used therein of the present invention exhibit the various excellent effects described above and are extremely beneficial.

[0039] The present invention is not limited to the above-described embodiment, and can be modified in various ways within the scope of the present invention according to the purpose and application. The shapes, sizes, numbers, materials, etc. of the first tank 1, the first pipe 21, the first heater 26 with the heat regulator 261, the second tank 3, the second pipe 41, the second heater 46 with the heat regulator 461, the high-pressure stirring injector 5, the hose 61, the nozzle 7, the cavity C, etc. can be appropriately selected according to the application. The heating adjustment by the heating regulators 261, 461 is not limited to those shown in Figs. 1 and 8. [Explanation of symbols]

[0040] 1 First tank (First tank for polyol component liquid) 21 First piping 26 First heater 261 Heating regulator 3 Second tank (Second tank for isocyanate component liquid) 41 Second piping 46 Second heater 461 Heating regulator 5. Stirring injection machine (high pressure stirring injection machine) 61 Hose 7 Nozzles 9. Rigid urethane foam (urethane foam) 921 Inclined hardening section g. Foaming materials (urethane foaming materials) g1 Reaction progress fluid C cavity C1 cavity top C2 cavity lateral part R Lining concrete S. Ground

Claims

1. A tunnel cavity repair method for filling a cavity that occurs between a tunnel's lining concrete and the ground, A first heater with a heating regulator is installed on a first pipe connecting a first tank for a polyol component liquid and the stirring injector, and a second heater with a heating regulator is installed on a second pipe connecting a second tank for an isocyanate component liquid and the stirring injector. A tip end of a hose of a cavity repair injection equipment having a base end connected to a fluid outlet of the stirring injector is connected to a nozzle having a tip end disposed in the cavity to be filled with urethane foam, Using the heating regulator, the isocyanate component liquid or / and the polyol component liquid to be fed into the stirring injector are heated and adjusted by the second heater or / and the first heater, and then A tunnel cavity repair method, characterized in that a reaction proceeding fluid obtained by mixing a polyol component liquid and an isocyanate component liquid in the stirring injection machine is discharged from the tip of the nozzle through the hose.

2. A tunnel cavity repair method as described in claim 1, wherein the temperature of the isocyanate component liquid in the second pipe and / or the polyol component liquid in the first pipe is set and changed by a heating regulator associated with the second heater and / or the first heater depending on the temperature of the repaired portion of the cavity.

3. A tunnel cavity repair method according to claim 1 or 2, wherein the set temperature of the second heater is made higher than the set temperature of the first heater, and the temperature of the isocyanate component liquid in the second pipe entering the stirring injector is made higher than the temperature of the polyol component liquid in the first pipe.

4. A tunnel cavity repair method according to any one of claims 1 to 3, wherein the stirring and grouting machine is a high-pressure stirring and grouting machine.

5. This is an injection facility for repairing tunnel cavities, which fills cavities that occur between the tunnel lining concrete and the ground. A mixing injector; a first pipe connecting the stirring injector and a first tank for storing a polyol component liquid; a first heater with a heating regulator attached to the first pipe; A second pipe connecting the stirring injector and a second tank for storing an isocyanate component liquid; a second heater with a heating regulator attached to the second pipe; a hose connecting the fluid outlet of the stirring injector and a nozzle having a tip disposed in the cavity of the tunnel; An injection equipment for repairing cavities in a tunnel, characterized in that the isocyanate component liquid and / or the polyol component liquid are heated and adjusted by the second heater and / or the first heater using the heating adjuster, and the reaction proceeding fluid mixed in the stirring injection machine is discharged from the tip of the nozzle through the hose.

6. 6. A tunnel cavity repair grouting facility according to claim 5, wherein the agitation grouting machine is a high-pressure agitation grouting machine.

7. The injection equipment for repairing a tunnel cavity as described in claim 5 or 6, wherein the second heater and / or the first heater having a protruding flange formed on the surface of a heating rod-shaped body are inserted and fixed into the second pipe and / or the first pipe, and the isocyanate component liquid and / or the polyol component liquid are heated by passing through the area of ​​the second heater in the second pipe and / or the area of ​​the first heater in the first pipe.

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