Tunnel cavity repair method and injection equipment used therefor

Abstract

To provide a tunnel cavity repair method and an injection facility used therefor.SOLUTION: In an injection facility for cavity repairing, a first heater 26 with a heat controller is installed on a first pipe 21 connecting a first tank 1 for polyol component liquid with an agitating injection machine 5, a second heater 46 with a heat controller is installed on a second pipe 41 connecting a second tank 3 for isocyanate component liquid with the agitating injection machine 5, a tip end part of a hose 61 of the injection facility in which a base end part of the hose 61 is connected to a fluid outlet of the agitating injection machine is connected to a nozzle 7 in which a tip mouth is arranged at a cavity C to which urethane foam is filled, and reaction progressing fluid g1 obtained by mixing polyol component liquid and isocyanate component liquid in the agitating injection machine is discharged from the tip mouth of the nozzle 7 through the hose, after heating and adjusting the isocyanate component liquid or / and the polyol component liquid entering the agitating machine 5 by the second heater 46 or / and the first heater 26 by using the heat controller.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for repairing a cavity in a tunnel for filling a cavity generated between the back of a tunnel lining and the natural ground, and an injection facility used therefor.

Background Art

[0002] In a tunnel, there may be a case where a cavity C as shown in FIG. 9 is generated between the back of the tunnel lining and the natural ground. If this cavity C is left unattended, there is a risk that an uneven load will be locally generated on the lining concrete R and cause deformation. Therefore, a method of backfilling injection for a tunnel has been proposed in which a filler is injected into the cavity C and filled with the filler to eliminate the unbalanced load (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 is, as described in claim 1 thereof, “… when injecting the filler from the injection holes in the lower row to the injection holes in the higher row among the plurality of injection holes, the filler is quantitatively injected into the injection holes in the lower row other than the injection holes provided at the top end portion, and the filler is pressure-injected only into the injection holes provided at the top plate portion, thereby injecting the filler into substantially the entire cavity portion. A method of backfilling injection for a tunnel.” In its embodiment, urethane foam is used as the filler.

[0005] However, when using urethane foam as the filling material, the reaction rate between the polyol component and the isocyanate component of the urethane foam raw material varies greatly depending on the temperature conditions of the repair location, such as seasonal factors. In summer, the reaction rate tends to increase, and when the temperature drops in winter, the reaction rate slows down. Therefore, even if it is intended to quantitatively inject the filling material into the injection hole, in winter, due to the slow reaction rate, it will be more than the original required usage amount in summer. Especially when high-pressure injection is performed using a high-pressure stirring injection machine, if the reaction rate is slow, the filling space will remain for a long time, resulting in excessive filling. And as the filling amount increases, the usage amount also increases. So, when adopting expensive urethane foam as the filling material, there is a problem that the cavity repair cost becomes unnecessarily high. Also, when filling cavity C with urethane foam using low-pressure mixing equipment, compared with the case of using a high-pressure stirring injection machine, the mixing, stirring, etc. of the urethane foam are insufficient, which may affect the quality.

[0006] The present invention aims to solve the above problems, and by injecting a temperature-controlled urethane foam raw material into the cavity, even if the temperature of the repair location changes due to the difference in air temperature according to the season, it provides a tunnel cavity repair method for stabilizing the filling amount of urethane foam into the cavity and injection equipment used therefor.

Means for Solving the Problems

[0007] In order to achieve the above object, the gist of the invention is a method for repairing a tunnel cavity that fills a cavity generated between the lining concrete of a tunnel and the natural ground. A first heater with a heat regulator is installed in a first pipe connecting a first tank for a polyol component liquid and a stirring injector, and a second heater with a heat regulator is installed in a second pipe connecting a second tank for an isocyanate component liquid and the stirring injector. The tip of the hose of the injection equipment for repairing the cavity, with the base end of the hose connected to the fluid outlet of the stirring injector, is connected to a nozzle with a tip port placed in the cavity to be filled with foamed urethane. Using the heat regulator, heating is performed with the second heater or / and the first heater to warm and adjust the isocyanate component liquid or / and the polyol component liquid entering the stirring injector. Then, a reaction-progress 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. This is the gist of the method for repairing a tunnel cavity. Also, the gist of the present invention is an injection device for repairing a tunnel cavity that fills a cavity generated between the lining concrete of a tunnel and the natural ground. The injection device includes a stirring injector, a first pipe connecting the stirring injector and a first tank for storing a polyol component liquid, a first heater with a heat 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 heat regulator attached to the second pipe, and a hose connecting the fluid outlet of the stirring injector and a nozzle with a tip port placed in the tunnel cavity. The heat regulator is used to heat and adjust the isocyanate component liquid or / and the polyol component liquid with the second heater or / and the first heater, and a reaction-progress fluid obtained by mixing in the stirring injector is discharged from the tip port of the nozzle through the hose. This is the gist of the injection device for repairing a tunnel cavity.

Effects of the Invention

[0008] The method for repairing cavities in a tunnel of the present invention and the injection equipment used therefor can fill an appropriate amount of foamed urethane into the cavity without being affected by seasons by controlling the temperature of the urethane foaming raw material injected into the cavity. Even in winter when the temperature is low, the amount of foamed urethane used does not increase, the cost of cavity repair work can be reduced, and excellent effects can be exerted.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the tunnel cavity repair method according to the present invention and the injection equipment used therefor will be described in detail. FIGS. 1 to 8 show one form of the tunnel cavity repair method (hereinafter, also simply referred to as the "cavity repair method") and the injection equipment used therefor. FIG. 1 is an explanatory diagram of installing the injection equipment at the cavity location, FIG. 2 is an explanatory diagram of discharging the reaction-progressing fluid of the foaming raw material from the nozzle of FIG. 1, FIG. 3 is an explanatory diagram of forming the inclined hardened portion of the foamed urethane, FIGS. 4 and 5 are cross-sectional views of the mixing and stirring portion of the high-pressure stirring injector, FIG. 6 is a cross-sectional view of discharging the reaction-progressing fluid to the cavity top after forming the inclined hardened portion of FIG. 3, FIG. 7 is a cross-sectional view of the reaction-progressing fluid that filled the cavity top of FIG. 6 and hardened, and FIG. 8 shows the control flowchart of the control circuit in one embodiment of the present invention. In addition, for easy understanding, each figure is simplified and the main parts of the invention are emphasized and illustrated. Parts not directly related to the present invention are omitted.

[0011] The tunnel cavity repair method is a cavity repair method for filling the cavity C as shown in FIG. 9 generated between the tunnel lining concrete R and the ground S with rigid foamed urethane 9. The rigid foamed urethane 9 for filling the cavity C is formed by a polyol component liquid 1a containing a polyol component for a two-component polyurethane resin (hereinafter, also referred to as "liquid A") and an isocyanate component liquid 3a containing an isocyanate component (hereinafter, also referred to as "liquid B"). Liquid A includes, for example, a polyol composed of both or one of polyether polyol and polyester polyol, a catalyst, a foaming agent, and the like. Liquid B includes, for example, TDI prepolymer, crude TDI, polymeric MDI, various modified MDI, and the like. A first pipe 21 connecting the first tank 1 for liquid A and the stirring injector 5 is provided with a first heater 26 with a heating regulator 261. On the other hand, a second pipe 41 connecting the second tank 3 for liquid B and the stirring injector 5 is provided with a second heater 46 with a heating regulator 461. The tip of the hose 61 related to the injection equipment for cavity repair, to which the base end of the hose 61 is connected to the fluid outlet of the stirring injector 5, is connected to a nozzle 7 with a tip port 70 placed in the cavity C to prepare for cavity repair. Then, after heating with the second heater 46 or / and the first heater 26 and adjusting the temperature of the liquid B or / and liquid A entering the stirring injector 5, the liquid A and the liquid B are mixed in the stirring injector 5, and the reaction-progressing fluid g1 is injected from the tip port 70 of the nozzle 7 into the cavity C to implement a cavity repair method.

[0012] Prior to the cavity repair method, the injection equipment used for this will be described. The injection equipment includes a stirring injector 5, a first heater 26 with a heating regulator 261, a second heater 46 with a heating 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 and the isocyanate component liquid supplied from the second pipe and discharges the mixed reaction-progressing fluid from the injector outlet. In this embodiment, a high-pressure stirring injector is used. The high-pressure stirring injector 5 is well-known. Here, the A liquid and the B liquid are injected from the pores 510 and 530 provided on the inner wall of the chamber 50 with high ejection energy, and the injection gun is used to make the two liquids collide, stir, and mix (Figure 4). To the high-pressure stirring injector 5, as shown in Figure 1, the A liquid and the B liquid from the first tank 1 and the second tank 3 are respectively pumped to the high-pressure stirring 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 provided on its upstream side. Compared with the injection pressure of the low-pressure mixer being 0.1 - 0.2 MPa, the high-pressure stirring injector 5 injects the A liquid and the B liquid into the chamber 50 at a high pressure of 7 - 9 MPa to cause a collision, making it a stirring injector with excellent mixing ability. The pumped A liquid (B liquid) passes through the flow path 51 (53) of the main mixing and stirring part 5b and is ejected into the cylinder at high pressure from the pores 510 (530) of the inner wall 500 of the chamber. The pores 510 of the A liquid and the pores 530 of the B liquid are inclined in the axial direction of the cylinder of the chamber 50 from the ring-shaped flow path part that circles near the inner wall 500 of the cylinder to the pore openings of the inner wall 500 of the cylinder, and with this inclination angle, the opposing A liquid and B liquid are ejected towards each other.

[0014] Explaining with reference to Figure 4, when the lever 5a is pulled, the rod 57 retracts, opening the orifice leading to the chamber 50 of the pore 530, and the B liquid is ejected from the flow path 53 into the cylindrical chamber 50. With further retraction of the rod 57, the rod head 571 retracts further than the position of the pore 510. The orifice of the pore 510 opens, and the A liquid is ejected from the flow path 51 towards the already ejected B liquid. Efficient stirring and mixing are generated by the collision of the A liquid and the B liquid. The stirred and mixed foaming raw material g becomes the reaction-progressing fluid g1 and heads towards the nozzle tip port 70 through the hose 61 connected to the pressing cylinder part 56 of the chamber 50 and further through the nozzle 7. In this embodiment, the pressing cylinder part 56 serves as the fluid outlet of the high-pressure stirring injector 5. On the other hand, if the pulled lever 5a is returned, the rod 57 advances as shown by the white arrow in Figure 5 in conjunction with this. Due to the advancement of the rod 57, the rod 57 closes the respective orifices related to the pore 510 of the A liquid ejection hole and the pore 530 of the B liquid ejection hole, stopping the supply of the A liquid and the B liquid into the chamber 50.

[0015] The first pipe 21 and the second pipe 41 are pipes from the first tank 1 and the second tank 3 to the high-pressure stirring injector 5 via the high-pressure pumps 25 and 45 (Figure 1). Flow meters 29 and 49 for displaying and recording the instantaneous flow rate and the integrated flow rate of the liquid A and the liquid B passing through the pipes are respectively installed in the middle of the first pipe 21 and the second pipe 41 on the discharge sides of the high-pressure pumps 25 and 45. The first heater 26 with a heater controller 261 and the second heater 46 with a heater controller 461 are installed on 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, so that the liquid A and the liquid B passing through the pipes are heated and adjusted to the set temperature.

[0016] The first heater 26 with a heater controller 261 is attached to the first pipe 21 connecting the high-pressure stirring injector 5 and the first tank 1 storing the liquid A, and is a heater for controlling the temperature of the liquid A flowing into the high-pressure stirring injector 5 with the heater controller 261 (Figure 1). The heater controller 261 compares and judges the temperature of the reaction progress fluid flowing in the first pipe 21 detected by the thermocouple 262 with the set temperature, and gives a change to the first heater 26 to adjust the heating. The first heater 26 is formed by protruding a spiral fin-shaped flange 26b on the surface of a heating rod-shaped body 26a with a large heat supply capacity (here, a sheath heater), and is arranged in the first pipe 21. The flange 26b serves as a heat dissipation plate of the heating rod-shaped body 26a, and smooths the heat transfer to the liquid A passing through the first pipe 21. Further, the flange 26b serves as a baffle plate to eliminate the temperature unevenness of the liquid A reaction progress fluid when passing through the first pipe 21. In this embodiment, the first hose heater 22 with a temperature controller 221 is attached to the first pipe 21 from the flow meter 29 to the high-pressure stirring injector 5. The first hose heater 22 has a heat preservation heater portion wound around the outer peripheral surface of the first pipe 21 to keep warm the reaction progress fluid flowing in the first pipe 21. Based on the detection of the thermocouple 222, the temperature controller 221 compares and judges with the set temperature, and gives a change to the first hose heater 22 to keep warm. The first heater 26 is attached to the front stage portion of the first pipe 21, and the first hose heater 22 is attached to the rear stage portion, but the temperature of the liquid A may be controlled by the heater controller 261 with the first heater 26 including the first hose heater 22.

[0017] The second heater 46 with a heating regulator 461 is attached to a second pipe 41 that connects the high-pressure stirring injector 5 and the second tank 3 for storing the liquid B. It is a heater that controls the temperature of the liquid B flowing into the high-pressure stirring injector 5 with the heating regulator 461. The thermocouple 462 detects the temperature of the reaction-progressing fluid in the second pipe 41, compares and judges it with the set temperature by the heating regulator 461, and gives a change to the second heater 46 to adjust the heating. Similar to the first heater 26, the second heater 46 also has a flange 46b protruding from a heating rod-shaped body 46a and is arranged in the second pipe 41. Similar to the first hose heater 22 with a temperature regulator 221, it is equipped with a second hose heater 42 with a temperature regulator 421. The second hose heater 42 is attached to the second pipe 41 from the flow meter 49 to the high-pressure stirring injector 5, and a heat-insulating heater part is wound around the outer peripheral surface of the second pipe to keep warm the reaction-progressing fluid flowing in the second pipe 41. Similar to the aforementioned first hose heater 22, for the second heater 46 including the second hose heater 42, the temperature of the liquid B can be controlled with the heating regulator 461. In addition, the present heating regulators 261, 461 and temperature regulators 221, 421 are equipped with thermometers that display the temperature of the liquid A or the liquid B detected by the thermocouples 262, 462, 222, 422 in the first pipe 21 and the second pipe 41.

[0018] The hose 61 is a pressure-resistant hose with flexibility that connects the high-pressure stirring injector 5 and the nozzle 7. In the cavity repair work, the nozzle 7 for injecting the foaming raw material g for rigid urethane foam into the cavity C is fixed to the formwork concrete R before the work. Nozzles 7 with their tips arranged in the cavity C to be filled with rigid urethane foam 9 are scattered at necessary locations of the formwork concrete R in advance, and a plurality of them are installed (Figs. 1 - 3). The hose 61 connects the nozzle 7 and the high-pressure stirring injector 5, and guides the reaction-progressing fluid g1 of the foaming raw material g obtained by stirring and mixing the liquid A and the liquid B by the high-pressure stirring injector 5 to the nozzle tip port 70.

[0019] This embodiment further provides an air pipe 81. It is an air supply tube connected to the hose 61 on the downstream side of the high-pressure agitation injector 5 (Figure 1). By providing the air pipe 81, it becomes possible to inject air from an air compressor (not shown) into the hose 61 near the fluid outlet from the high-pressure agitation injector 5. Reference numeral 62 indicates a pressure gauge attached to the connection portion between the hose 61 and the air pipe 81 immediately after the air pipe 81 is connected on the downstream side of the high-pressure agitation injector 5.

[0020] Using the above injection equipment, cavity repair is performed as follows. Here, a repair method of filling a cavity C as shown in Figure 9 with rigid urethane foam 9 will be described.

[0021] First, the entire set of injection equipment is carried into the tunnel cavity repair site by vehicle. Check the connection between the outlet of the high-pressure agitation injector 5 and the base end of the hose 61, and connect the tip of the hose to the nozzle 7 located at the cavity C where the rigid urethane foam 9 is to be filled. The first connection is made to the nozzle 7 where the tip port 70 is located at the slightly inclined portion C21 of the cavity side portion C2 extending from the substantially flat top C1 as shown in Figure 1. Reference numeral 73 indicates the connection joint between the nozzle 7 and the hose 61. Around this time, a generator (not shown) is started. At the same time, the high-pressure pumps 25, 45 are started, and an air compressor for supplying air to the air pipe 81 is operated to set it in a standby state.

[0022] Then, according to the temperature of the repair location affected by the outside air temperature, etc., the temperature settings of the first heater 26 and the second heater 46 are made. That is, the inflow temperature to the high-pressure agitation injector 5 is set and input by the heating regulators 261, 461. Specifically, the set temperature is determined according to the temperature drop of the repair location due to the season (the concrete part in winter and the ground temperature in the cavity). The first heater 26 and the second heater 46 are heated and controlled so that the A liquid and the B liquid that have been temperature-adjusted through the first pipe 21 and the second pipe 41 from the first tank 1 and the second tank 3 can be sent to the high-pressure agitation injector 5. 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 controlled for heating to adjust the temperature of the liquid B in the second pipe 41 or / and the liquid A in the first pipe 21. In winter, the liquid temperature of the reaction-progressing fluid g1 discharged to the inclined portion C22 of the cavity side portion C2 and the cavity top portion C1 is made higher than that in summer to prevent the reaction rate of the foamed urethane raw material from becoming slower than that in summer. When the reaction rate of the foamed urethane raw material becomes slower than that in summer, the foaming and curing rate also becomes slower. Also, when using the high-pressure stirring injector 5, since it is a high-pressure injection, if the reaction rate is slow, the filling space will remain for a long time and overfilling will occur. Therefore, the amount of the foamed urethane raw material used in winter will be more than that in summer. This will increase the cost of cavity repair work, but by adjusting the temperature of the liquid B in the second pipe 41 or / and the liquid A in the first pipe 21, it is possible to prevent the increase in the cost of cavity repair work in winter.

[0023] Specifically, the relationship between the liquid temperatures of the liquid A and the liquid B and CT (cream time), GT (gel time), and RT (rise time) is shown in Table 1. Based on this, considering the temperature of the repair location according to the season, the inflow temperature to the high-pressure stirring injector 5 is determined. That temperature is input by the heating regulators 261 and 461. In the present invention, CT refers to the foaming start time, GT refers to the resinification time when starting to draw a thread, and RT refers to the time until the foaming magnification expands to 40 times here.

[0024]

Table 1

[0025] According to the seasonal variation, the temperature of the liquid B in the second pipe 41 is set by the heating regulator 461 related to 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 and 261 related to the second heater 46 and the first heater 26. Note that since the liquid A contains a foaming agent, it cannot be made too hot. Therefore, when exceeding a certain temperature (30 °C in this embodiment), only the temperature of the liquid B is raised. Here, as a specific example, the case where the temperature of the repair location (a) is 20°C in the summer season and the case where the temperature of the repair location (b) is 10°C in the winter season will be described.

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

[0027] The heating regulators 261 (461) are control circuits, which are heating control means incorporating a CPU, and are connected to the thermocouples 262 (462) and the first heater 26 (second heater 46). Each control circuit controls the energization of the first heater 26 and the second heater 46 as shown in Fig. 8(a) based on the temperature signals of the respective thermocouples 262, 462. Fig. 8(a) shows the heating control means for the reaction-progressing fluid passing through the first heater 26. In step 101, the detection signal of the thermocouple 262 is read. In the subsequent step 102, when the detected temperature is lower than the set value of 30°C, the first heater 26 is turned on (step 103). On the other hand, when the detected temperature is 30°C or higher in step 102, the first heater 26 is turned off. Thus, by turning the first heater 26 on and off with 30°C as the boundary, the temperature of the reaction-progressing fluid in the first pipe 21 passing through the first heater 26 is maintained at approximately the set value of 30°C. The second heater 46 also has the same set value of 30°C as the first heater 26. The first heater 26 is replaced by the second heater 46, the thermocouple 262 is replaced by the thermocouple 462, and the heating regulator 461 controls as shown in Fig. 8(a) to maintain the temperature of the reaction-progressing fluid in the second pipe 41 passing through the second heater 46 at approximately the set value of 30°C. In addition, the temperature regulators 221, 421 for heat preservation are also set and input to 30°C in accordance with the set input of the heating regulators 261, 461, and conduct the A liquid and B liquid at 30°C to the high-pressure stirring injector 5.

[0028] Subsequently, an operator on the deck D of the aerial work platform pulls the lever 5a. Then, liquid A and liquid B are injected into the chamber 50 of the agitation injector and collide and mix. The temperature of the reaction-progressing fluid g1 after the two liquids are mixed and exit the high-pressure agitation injector 5 becomes approximately 30°C, and the reaction-progressing fluid g1 is discharged from the nozzle tip port 70 (Figure 2). Incidentally, during the discharge of the reaction-progressing fluid g1, a small amount of air is appropriately injected into the hose 61 from which the reaction-progressing fluid g1 exits the high-pressure agitation injector 5 by opening the valve 82 of the air pipe 81. This is to prevent cell roughness and reduce the liquid flow resistance in the hose 61. Then, after discharging the required amount of the reaction-progressing fluid g1, the lever 5a is returned to stop liquid A and liquid B. As shown in Table 1, a short reaction time can be ensured with a CT of 7 seconds and an RT of 64 seconds for the liquid temperatures of 30°C of liquid A and liquid B. Therefore, foaming and curing are accelerated, and the amount of the urethane foam raw material filled in the inclined portion C21 does not increase. After forming the rigid urethane foam 9 in the inclined portion C21 on the right side of the paper surface in Figures 3 and 6, similarly, the hose 61 is connected to the nozzle 7 in the inclined portion C21 on the left side of the paper surface, and the rigid urethane foam 9 is also formed in the inclined portion C21 on the left side of the paper surface in Figure 6.

[0029] Next, the tip of the hose 61 is transferred and connected to the nozzle 7 provided at the cavity top C1 from the nozzle 7 in the inclined portion C21. Then, the required amount of the reaction-progressing fluid g1 is also discharged at the cavity top C1 (Figure 6), and the rigid urethane foam 9 is formed (Figure 7). By heating and adjusting both liquid A and liquid B to 30°C, the rigid urethane foam 9 with stable quality is filled. Also, problems such as insufficient mixing in the case of low-pressure foaming due to high-pressure injection by the high-pressure agitation injector are solved, and the cavity repair work filled with the foam urethane with stable quality is completed.

[0030] Also, the case where the repair location in winter is 10°C in another season will be described. (b) When the outside air temperature is 10°C First, after connecting the hose 61 to the nozzle 7 of the inclined portion C21, the inflow temperature of the liquid A into the high-pressure stirring injector 5 is set and input to 30°C by the heating regulator 261. The inflow temperature of the liquid B into the high-pressure stirring injector 5 is set and input to 40°C, which is higher than the set value of 30°C of the heating regulator 261, by the heating regulator 461.

[0031] The case of setting and inputting to 30°C by the heating regulator 261 is the same as the control shown in Fig. 8(a) of (a) described above, and the description is omitted. On the other hand, in the case of setting and inputting the inflow temperature of the liquid B into the high-pressure stirring injector 5 to 40°C, the control circuit of the heating regulator 461 controls the energization of 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 progress fluid passing through the second heater 46. In step 201, the detection signal of the thermocouple 462 is read, and in the subsequent step 202, when the detected temperature is lower than the set value of 40°C, the second heater 46 is turned on (step 203). On the other hand, when the detected temperature is 40°C or higher in step 202, the second heater 46 is turned off. Thus, by turning the second heater 46 on and off with 40°C as the boundary, the temperature of the reaction progress fluid in the second pipe 41 passing through the second heater 46 is maintained at approximately the set value of 40°C. The temperature regulator 221 for heat preservation is set and input to 30°C in accordance with the input temperature of the heating regulator 261, and the temperature regulator 421 is set and input to 40°C in accordance with the input temperature of the heating regulator 461, guiding the liquid A at 30°C and the liquid B at 40°C to the high-pressure stirring injector 5.

[0032] Subsequently, an operator on the deck D pulls the lever 5a to inject the liquid A and the liquid B into the chamber 50 of the high-pressure stirring injector 5 and cause them to collide and mix. Then, the temperature of the reaction progress fluid g1 in which the two liquids are mixed after exiting the high-pressure stirring injector 5 becomes higher than 30°C, and the reaction progress fluid g1 at a temperature higher than that in summer is discharged from the nozzle tip port 70 of the inclined portion C21. During the discharge of the reaction progress fluid g1, air is appropriately injected into the hose 61. After discharging the required amount of the reaction-progressing fluid g1, the lever 5a is returned to stop the liquid A and liquid B. During filling, heat is taken away from the tunnel lining concrete R and the natural ground S. However, since the reaction-progressing fluid g1 at a temperature higher than that in summer is injected, the reaction rate is such that in summer, the CT is 7 seconds and the RT approaches 64 seconds. After forming the rigid urethane foam 9 on the inclined portion C21 on the right side of the drawing sheet of FIG. 6, similarly, a hose 61 is connected to the nozzle 7 having the tip port 70 on the inclined portion C21 on the left side of the drawing sheet, and the rigid urethane foam 9 is also formed on the inclined portion C21 on the left side of the drawing sheet of FIG. 6.

[0033] Next, the tip of the hose 61 is transferred and connected to the nozzle 7 provided at the cavity top C1. After that, the operator on the deck D pulls the lever 5a again to inject the liquid A and the liquid B into the chamber 50 of the high-pressure agitation injector 5 and cause them to collide and mix. The reaction-progressing fluid g1 after exiting the high-pressure agitation injector 5 is discharged from the tip port 70 of the nozzle (FIG. 6). Then, the cavity top C1 is filled with the rigid urethane foam portion 91 having a desired expansion ratio (FIG. 7). After injecting the required amounts of the liquid A and the liquid B, the lever 5a is returned to its original state. The cavity repair work in which the cavity C is filled with the desired urethane foam 9 with stable quality is completed. In the figure, the reference numeral 85 indicates the air flow, and the reference numeral TN indicates inside the tunnel resistance.

[0034] (3) Effect The tunnel cavity repair method configured as described above and the injection equipment used therefor heat with the second heater 46 or / and the first heater 26 using the heat regulators 461 and 261, warm and adjust the liquid B or / and the liquid A, and then make the reaction-progressing fluid g1 by high-pressure mixing of the liquid A and the liquid B in the high-pressure agitation injector 5. Therefore, the rigid urethane foam 9 can be filled into the cavity C with stable quality. Regarding the formation of the rigid urethane foam 9, where the CT, GT, RT, viscosity, etc. are greatly affected by a slight temperature difference as shown in Table 1, the reaction-progressing fluid g1 of the foaming raw material g can be controlled to a desired temperature and injected into the cavity C. Therefore, the cavity C can be filled with the urethane foam 9 with stable quality regardless of the season.

[0035] There is also a case where the foaming raw material g is used separately for summer and winter, but the raw material management of the polyol component liquid 1a and the isocyanate component liquid 3a becomes troublesome, and it is difficult to cope with the subtle changes in the outside air temperature that also vary depending on the day. On the other hand, according to the present invention, the same raw materials can be used throughout the year, facilitating inventory management. When the first heater 26 with the heating regulator 261 and the second heater 46 with the heating regulator 461 are provided, the polyol component liquid 1a and the isocyanate component liquid 3a can be adjusted and controlled to a predetermined temperature, and the liquid A and the liquid B can be made to react under appropriate temperature conditions in the high-pressure stirring injector 5. By changing the setting of the temperature of the isocyanate component liquid in the second pipe 41 and the polyol component liquid in the first pipe 21, the filling amount of the foamed urethane can be stabilized throughout the year, and the cavity C can be filled with the rigid foamed urethane 9 of good quality with a constant quality.

[0036] And since the present invention uses a high-pressure stirring injector 5 with a pressure of about 7 to 9 MPa, unlike the low-pressure mixing performed at 0.1 to 0.2 MPa, the degree of stirring and mixing of the liquid A and the liquid B can be increased, accelerating the reaction and proceeding with a more homogenized urethane reaction. Different from the case of low-pressure mixing equipment, the mixing, stirring, etc. of the foamed urethane are not insufficient, and there is no risk of affecting the quality.

[0037] As shown in Table 1, the reaction rate of the foamed urethane raw material between the liquid A and the liquid B is easily affected by temperature. Especially during the cold winter season, heat is taken from the tunnel lining concrete R and the natural ground S, and the reaction between the liquid A and the liquid B becomes slower. When the RT becomes longer, it takes time to fill the cavity, and since injection continues during that time, the pack rate becomes higher. In contrast, since the present invention is provided with the first heater 26 with the heating regulator 261 and the second heater 46 with the heating regulator 461, it can also cope with the temperature of the repair parts in summer and winter, and always fill the cavity C with the rigid foamed urethane 9 of good quality that ensures the desired foaming ratio. By controlling the temperature of the liquid A and the liquid B, the RT can be adjusted to the same temperature environment in summer and winter, preventing over-injection of the foaming raw material g in winter. An appropriate amount of the foamed urethane 9 is filled, and it is not necessary to use an excessive amount of the expensive foaming raw material g. A proper price construction is realized.

[0038] Furthermore, since the pressure gauge 62 for measuring the pressure of the reaction-progressing fluid g1 is attached on the downstream side of the high-pressure stirring injector 5, the pressure of the reaction-progressing fluid g1 itself near the nozzle 7 can be known. It is also possible to accurately determine whether the reaction-progressing fluid g1 discharged from the nozzle tip port 70 has reached a predetermined pressure. By this pressure check in addition to the temperature check, the rigid foam urethane 9 with more stable quality can be filled into the cavity C. As described above, the tunnel cavity repair method of the present invention and the injection equipment used therefor exhibit the various excellent effects described above and are extremely beneficial.

[0039] Note that the present invention is not limited to that shown in the above-described embodiment, and various modifications can be made 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 heating regulator 261, the second tank 3, the second pipe 41, the second heater 46 with the heating 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 and 461 is not limited to that shown in FIGS. 1 and 8.

Explanation of Reference Numerals

[0040] 1 First tank (first tank for polyol component liquid) 21 First pipe 26 First heater 261 Heating regulator 3 Second tank (second tank for isocyanate component liquid) 41 Second pipe 46 Second heater 461 Heating regulator 5 Stirring injector (high-pressure stirring injector) 61 Hose 7 Nozzle 9 Rigid foam urethane (foamed urethane) 921 Inclined curing part g Foaming raw material (foamed urethane raw material) g1 Reaction-progressing fluid C Cavity C1 Cavity top C2 Cavity side part R overlaid concrete S natural ground

Claims

1. An injection facility for tunnel cavity repair that fills cavities formed between tunnel lining concrete and the natural ground, comprising: a stirring and injection machine; a first pipe connecting the stirring and injection machine and a first tank storing a polyol component liquid; a first heater with a heating regulator attached to the first pipe; a second pipe connecting the stirring and injection machine and a second tank 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 and injection machine and a nozzle with its tip port arranged in the cavity of the tunnel, wherein the heating regulator adjusts the temperature of the isocyanate component liquid or / and the polyol component liquid with the second heater or / and the first heater, and the reaction progress fluid formed by mixing with the stirring and injection machine is discharged from the tip port of the nozzle through the hose, the stirring and injection machine is a stirring and injection machine that pressure-injects and collides an isocyanate component liquid and a polyol component liquid at a pressure of 7 to 9 MPa, and is characterized in that it is an injection facility for tunnel cavity repair.

2. A tunnel cavity repair method using the injection facility for cavity repair according to Claim 1.

3. The tunnel cavity repair method according to Claim 2, wherein the temperature of the isocyanate component liquid in the second pipe or / and the polyol component liquid in the first pipe is set and changed by a heating regulator related to the second heater or / and the first heater according to the temperature of the repair location of the cavity.

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