Tunnel boring machine and filling method for filling material

Abstract

To surely fill a gap between a ground and a lining with a filler.SOLUTION: A tunnel excavator comprises a tubular body extending along the axial direction of a tunnel, an excavation section driven in rotation in front of the body, an injection device that fills a gap between an inner wall and a lining with a filler, and an electrical conductivity meter 61 provided at the rear end of the body in the excavation direction and facing the gap between the inner wall and the lining. The electrical conductivity meter 61 is configured to be able to measure the electrical conductivity of the filler filled in the gap.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a tunnel boring machine and a method for filling a filling material. [Background technology]

[0002] Patent Document 1 describes filling the gap (tail void) between the inner surface of the ground excavated by a tunnel boring machine and the outer surface of a lining body constructed in a ring shape along the inner surface of the ground by injecting backfill material into the gap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-75486 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, filling of the gap between the ground and the lining with filler (backfilling material) has been confirmed by detecting the pressure in the gap.

[0005] However, groundwater can flow into the gap between the natural ground and the lining. With the conventional method of checking filling by pressure, even if an increase in pressure in the gap indicates that the gap has been filled, there is still the possibility that groundwater may have entered.

[0006] The present invention aims to reliably fill the gap between the ground and the lining with filler material. [Means for solving the problem]

[0007] The present invention relates to a tunnel boring machine that constructs a tunnel by excavating the ground while covering the inner wall of the excavated hole with a lining, and includes: a cylindrical body extending along the axial direction of the tunnel; an excavation unit that is driven to rotate at the front of the body; an injection device that fills the gap between the inner wall and the lining with a filler; and a measurement unit that is provided at the rear end of the body in the excavation direction, facing the gap between the inner wall and the lining. a control device that acquires the measurement results of the measurement unit; The measuring unit is configured to be able to measure an index value indicating a physical property of a filler to be filled into the gap, The control device determines whether a threshold value for the filler index value stored in advance matches the measurement result of the index value measured by the measurement unit. It is characterized by the following.

[0009] The present invention also provides a filling method for filling a gap between an inner wall of a drilled hole and a lining covering the inner periphery of the inner wall with a filler, the method comprising: an injection step of injecting a filler into a gap between the inner wall and an outer peripheral surface of the lining; and a measurement step of measuring an index value indicating a physical property of the filler filled into the gap by a measuring unit provided so as to face the gap between the inner wall and the outer peripheral surface of the lining. a filling detection step of confirming that the gap is filled with the filler material based on the measurement result in the measurement step; Including In the filling detection step, it is determined whether a predetermined threshold value of the index value matches the measurement result of the index value in the measurement step. It is characterized by: [Effects of the Invention]

[0010] According to the present invention, the gap between the natural ground and the lining body can be reliably filled with filler. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing the configuration of a tunnel boring machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view showing the configuration of the vicinity of the rear end portion of the skin plate of the tunnel boring machine according to the embodiment of the present invention. [Figure 3] 1 is a block diagram showing a configuration of a filling confirmation system according to an embodiment of the present invention. [Figure 4] 3 is an enlarged cross-sectional view showing the periphery of the sensor unit in FIG. 2. FIG. [Figure 5] FIG. 10 is a block diagram showing the configuration of a filling confirmation system according to a second modified example of the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] First, a tunnel boring machine according to an embodiment of the present invention will be described with reference to FIG. 1. The following description will be given assuming that the tunnel boring machine is a shield machine 100 used in a shield tunneling method. The shield machine 100 excavates the ground (natural ground) to form an excavation hole and constructs a shield tunnel T (tunnel) by assembling segment rings 1 (lining) to cover the inner wall of the excavation hole. The segment rings 1 are assembled by arranging multiple arc-shaped segments 2 in a ring shape in the circumferential direction and connecting adjacent segments 2. Multiple segment rings 1 are also assembled in the axial direction, and adjacent segment rings 1 are connected to each other. A filler material 3 is filled into the so-called tail void V (gap) between the outer periphery of the segment ring 1 and the inner wall of the natural ground. The present invention is also applicable to tunnel boring machines other than the shield machine 100, such as an excavator installed at the end of a jacking pipe in a jacking method.

[0014] In the following description, the tunnel face side, which is the direction in which the shield machine 100 advances, will be referred to as the "front," and the tunnel mouth side, which is the opposite direction, will be referred to as the "rear."

[0015] As shown in Figure 1, the shield machine 100 is a mud pressure type shield machine used in a mud pressure shield tunneling method. Note that the shield machine 100 may also be a mud water type shield machine.

[0016] The shield tunneling machine 100 has a cylindrical skin plate 10 (body) extending along the axial direction of the shield tunnel T, a cutter head 20 (excavation section) that is driven to rotate in front of the skin plate 10, and an electric motor 30 that rotates the cutter head 20.

[0017] A partition wall 11 is provided on the inner peripheral surface of the skin plate 10, and is arranged opposite the cutter head 20 in the axial direction of the shield tunnel T. A rotating drum 31 is rotatably supported by the partition wall 11. The cutter head 20 is connected to the rotating drum 31 via a connecting rod 32 and can rotate together with the rotating drum 31. The rotating drum 31 is connected to an electric motor 30 via a reduction mechanism (not shown), and when driven by the electric motor 30, the rotating drum 31 and cutter head 20 rotate relative to the skin plate 10. The rotation direction and rotation speed of the cutter head 20 can be controlled by controlling the operation of the electric motor 30.

[0018] A plurality of cutter bits 21 are attached to the cutter head 20, and the cutter head 20 excavates the natural ground (face) by rotating while pressed against the natural ground (face). The outer diameter of the cutter head 20 is approximately equal to the outer diameter of the skin plate 10, and the natural ground is excavated with an inner diameter approximately equal to the outer diameter of the skin plate 10.

[0019] The shield tunneling machine 100 further includes a screw conveyor 40 for transporting excavated soil to the rear of the shield tunneling machine 100, an erector 33 for assembling the segment ring 1, a plurality of shield jacks 34 for advancing the shield tunneling machine 100, and an injection device 50 for injecting filler material 3 into the tail void V between the inner surface of the excavated hole excavated by the cutter head 20 and the outer surface of the segment ring 1.

[0020] The partition wall 11 and the rotating drum 31 are arranged at a distance from the cutter head 20, and a chamber 22 is formed by the skin plate 10, the partition wall 11, the cutter head 20, and the rotating drum 31. Excavated soil produced by excavation by the cutter head 20 temporarily accumulates in the chamber 22. The excavated soil accumulated in the chamber 22 is discharged from the discharge outlet 11a formed in the partition wall 11 using the screw conveyor 40, and is transported to the entrance of the shield tunnel T (the start point of excavation) through the space inside the segment rings 1 that are constructed sequentially as the shield machine 100 advances.

[0021] The segment ring 1 is assembled inside the skin plate 10 using an erector 33. The erector 33 is capable of gripping the segments 2 and rotating in the circumferential direction, and arranges multiple segments 2 in an annular shape along the inner circumferential surface of the skin plate 10. The segment ring 1 is assembled by connecting the annularly arranged segments 2 to each other. In addition, the annularly arranged segments 2 are connected to the assembled segment ring 1.

[0022] When the shield jack 34 is extended with the tip of the rod protruding from the cylinder of the shield jack 34 in contact with the side of the segment ring 1, the cutter head 20 is pressed against the ground by the reaction force obtained from the segment ring 1. In this way, the shield tunneling machine 100 uses the reaction force obtained when the shield jack 34 presses against the existing segment ring 1 as the propulsion force for forward excavation.

[0023] The injection device 50 has a pump 51 that discharges the filler 3 and a pipe 52 that guides the filler 3 discharged from the pump 51 to the tail void V. The filler 3 is a cement-based material, such as mortar. In this embodiment, an injection hole 2a is formed in advance in the segment 2, and the pump 51 injects the filler 3 from the injection hole 2a into the tail void V through the pipe 52. When the injection device 50 injects the filler 3 into the tail void V, the segment ring 1 becomes firmly bonded to the ground via the filler 3.

[0024] 1 and 2, a plurality of annular tail seals 31a that seal the gap between the skin plate 10 and the segment ring 1 are provided at predetermined intervals in the axial direction on the inner peripheral surface of the skin plate 10. The tail seals 31a are provided to prevent soil, water, and filler material 3 from entering the shield machine 100 through the gap between the skin plate 10 and the segment ring 1.

[0025] Additionally, the skin plate 10 is provided with a backflow prevention plate 35 as an annular sealing part that seals the gap between the outer peripheral surface of the skin plate 10 and the inner wall of the natural ground. The backflow prevention plate 35 prevents the filler material 3 filled into the tail void V from being guided to the face in front of the skin plate 10 through the gap between the skin plate 10 and the natural ground.

[0026] In addition, the tail seal 31a and the backflow prevention plate 35 also function as a formwork for filling the filler 3 into the tail void V. By providing the tail seal 31a and the backflow prevention plate 35, the filler 3 can be filled into the tail void V more reliably.

[0027] 3, the shield machine 100 is also equipped with a filling confirmation system 60 that confirms the filling of the filler material 3 into the tail void V. The filling confirmation system 60 has an electrical conductivity meter 61 as a measurement unit provided at the rear end of the skin plate 10 facing the tail void V, a pressure gauge 62 as a pressure measurement unit that measures the pressure of the tail void V, a flow meter 63 as a filling amount measurement unit that measures the amount of filler material 3 filled into the tail void V from the injection device 50, a control device 70 into which the measurement results of the electrical conductivity meter 61, the pressure gauge 62, and the flow meter 63 are input, and a display 71 for displaying the filling status of the filler material 3 into the tail void V.

[0028] As shown in FIG. 4, a sensor unit U is configured by an electrical conductivity meter 61 and a housing 65 that accommodates the electrical conductivity meter 61 and is attached to the skin plate 10.

[0029] In this embodiment, eight electrical conductivity meters 61 (sensor units U) are provided at equal intervals in the circumferential direction at the rear end of the skin plate 10 (see FIG. 2). Specifically, a housing 65 is attached to the rear end of the skin plate 10 via bolts or the like (not shown). As shown in FIG. 4, the electrical conductivity meter 61 has a pair of electrodes 61a, 61b facing the tail void V. The pair of electrodes 61a, 61b are connected to the control device 70 (see FIG. 3) via wiring 61c passing through a passage hole 10a formed in the skin plate 10. The electrical conductivity meter 61 measures the electrical conductivity of the measurement object (the filling material of the tail void V) that the electrodes 61a, 61b contact by passing current between the electrodes 61a, 61b to obtain the electrical resistance. Note that the passage hole 10a is not shown in FIGS. 1 and 2.

[0030] The pair of electrodes 61a, 61b are each inserted into an insertion hole 66a of a resin holder 66. The holder 66 is inserted into and attached to, for example, an accommodation hole 65a of a metal housing 65. In this way, the pair of electrodes 61a, 61b of the electrical conductivity meter 61 are attached to the housing 65 via the holder 66. The tips of the pair of electrodes 61a, 61b enter the tail void V.

[0031] The pair of electrodes 61a, 61b are attached to the housing 65 by the resin holder 66, thereby sealing the gap between the electrodes 61a, 61b and the accommodation hole 65a of the housing 65, and preventing leakage of sediment and water from within the tail void V through the gap between the electrodes 61a, 61b and the accommodation hole 65a. Furthermore, because the holder 66 is made of an insulating resin, the holder 66 prevents current from flowing between the electrodes 61a, 61b through the housing 65. The holder 66 is not limited to being made of resin, but is preferably made of an insulating material.

[0032] In this embodiment, four pressure gauges 62 are provided at the rear end of the skin plate 10 at equal intervals in the circumferential direction. As shown in FIG. 4, the four pressure gauges 62 are each housed in a mounting hole 65b formed in the housing 65 of the sensor unit U and attached to the housing 65. The pressure gauges 62 are connected to the control device 70 via wiring 62a passing through a passage hole 10a formed in the skin plate 10. In other words, the four pressure gauges 62, together with the electrical conductivity meter 61, constitute the sensor unit U. The pressure gauges 62 are strain gauge or piezoelectric pressure sensors, and are provided in the housing 65 so that their pressure detection surfaces face the tail void V. Note that a sensor unit U not provided with a pressure gauge 62 has the same configuration as the sensor unit U shown in FIG. 4 except that it does not have the pressure gauge 62 and the mounting hole 65b into which the pressure gauge 62 is inserted, and therefore is not shown in the figure.

[0033] The flow meter 63 measures the flow rate of the filler material 3 discharged from the pump 51 of the injection device 50. The flow meter 63 is attached, for example, to the pipe 52 that guides the filler material 3 discharged from the pump 51, and measures the flow rate passing through the pipe 52 (see FIG. 1).

[0034] Furthermore, the piping 52 is provided with a discharge pressure gauge 64 that measures the discharge pressure of the filler discharged from the pump 51. The measurement result of the discharge pressure gauge 64 is input to the control device .

[0035] The control device 70 is configured by a computer including an arithmetic processing device such as a CPU, a storage device, a network connection device, etc. The storage device stores programs, applications, etc. in advance, and the CPU executes these programs to perform the various functions of the control device 70 described in this specification. The control device 70 may be configured as a single device, or may be divided into multiple devices and configured so that each control is distributed among the multiple devices.

[0036] The control device 70 acquires the measurement results of the electrical conductivity meter 61, the pressure meter 62, and the flow meter 63, and checks the filling of the filler 3 based on the respective measurement results. The electrical conductivity of the filler 3 is stored in advance in the control device 70. The check result of the filler 3 by the control device 70 is displayed on the display 71.

[0037] Next, a method for filling the tail void V with the filler 3 will be described.

[0038] The method of filling filler 3 into tail void V in this embodiment includes an injection process of filling filler 3 into tail void V, a measurement process of measuring the electrical conductivity of the filler 3 filled into tail void V using an electrical conductivity meter 61, and a filling detection process of confirming the filling of filler 3 into tail void V based on the measurement results in the measurement process.

[0039] In the injection process, as the skin plate 10 advances, the pump 51 is used to inject the filler 3 into the tail void V, which is a space formed between the outer peripheral surface of the segment ring 1 and the inner wall of the natural ground.

[0040] The measuring and fill detection steps are performed by a fill verification system 60 .

[0041] In the measurement process, the electrical conductivity of the tail void V is measured by an electrical conductivity meter 61. The pressure inside the tail void V is measured by a pressure meter 62. The flow rate of the filler 3 discharged from the pump 51 is measured by a flow meter 63. The discharge pressure of the filler 3 from the pump 51 is measured by a discharge pressure meter 64.

[0042] In the filling detection process, three types of filling confirmation are performed: electrical conductivity-based filling confirmation, pressure-based filling confirmation, and filling amount-based filling confirmation. When filling of the filler 3 into the tail void V is confirmed in all three of these filling confirmations, it is determined that the tail void V has been filled with the filler 3.

[0043] In the filling confirmation based on electrical conductivity, the electrical conductivity acquired by each of the eight electrical conductivity meters 61 is compared with the electrical conductivity of the filler 3 stored in advance in the control device 70. When the measurement results of all of the eight electrical conductivity meters 61 match the stored electrical conductivity of the filler 3, it is determined that filling confirmation based on electrical conductivity has been performed.

[0044] Note that the fact that the measured electrical conductivity matches the pre-stored electrical conductivity of the filler 3 does not mean in a strict sense, but rather means that the measured electrical conductivity is included within a predetermined numerical range indicating the electrical conductivity of the filler 3. In other words, the electrical conductivity of the filler 3 in this embodiment does not mean including only one value, but also means including a numerical range with a predetermined width.

[0045] In the pressure-based filling confirmation, if all of the measurement results of the four pressure gauges 62 exceed a pressure determination threshold pre-stored in the control device 70, it is determined that the pressure-based filling confirmation has been performed. The pressure determination threshold is the pressure value when the tail void V is sufficiently filled with the filler material 3, and is specifically set to a pressure value equal to or slightly higher than the face pressure. Furthermore, in the pressure-based filling confirmation, in addition to determining whether the pressure value measured by the pressure gauges 62 exceeds the pressure determination threshold, it may also be possible to confirm that the pressure value measured by the discharge pressure gauge 64 has been reached. In this way, by comparing the pressure measured by the pressure gauges 62 with both the pressure determination threshold and the discharge pressure of the pump 51, the accuracy of the filling confirmation of the filler material 3 can be further improved.

[0046] In the filling confirmation based on the filling amount, if the amount of filler material 3 filled into the tail void V exceeds a filling amount judgment threshold stored in advance in the control device 70, it is determined that filling confirmation based on the filling amount has been made. The filling amount judgment threshold is set to a value at least equal to or greater than the volume of the tail void V, and preferably to a value several percent greater than the volume of the tail void V. The volume of the tail void V can be calculated based on the inner diameter of the natural ground (the outer diameter of the cutter head 20), the outer diameter of the segment ring 1, and the excavation speed of the shield tunneling machine 100. The filling amount of the filler material 3 filled into the tail void V can be calculated as the integrated value of the flow rate measured by the flow meter 63. In other words, if the amount of filler material filled per unit time measured by the flow meter 63 is equal to or greater than the volume of the tail void V generated per unit time, it is determined that filling confirmation based on the filling amount has been made.

[0047] As described above, when filling of the filler 3 is confirmed in all of the filling confirmations based on the electrical conductivity, pressure, and filling amount, it is determined that the tail void V has been filled with the filler 3, and the determination result is displayed on the display 71. Note that the display 71 may display the values of the electrical conductivity, pressure, and filling amount, or may display that the filling is insufficient (incomplete).

[0048] According to the above-described embodiment, the following advantageous effects are achieved.

[0049] Water leaking from the ground can flow into the tail void. In this case, even if water is mixed in the filler material, the pressure in the tail void increases, so it is difficult to detect water mixing using a method that checks the filling of the tail void by pressure. For this reason, it is difficult to detect with high accuracy whether filler material has filled the tail void using pressure alone.

[0050] In contrast, in the present embodiment, the filling of the tail void V with the filler 3 is confirmed using the electrical conductivity measured by the electrical conductivity meter 61. The filler 3 and water have different physical properties and different electrical conductivities. Therefore, when confirming the filling of the filler 3, it is possible to distinguish between water and the filler 3 based on the electrical conductivity, which is an index value indicating the physical properties of the filler 3. Therefore, according to the embodiment, the accuracy of confirming the filling of the tail void V with the filler 3 is improved, and the tail void V can be more reliably filled with the filler 3.

[0051] Furthermore, in this embodiment, the filling of the filler 3 into the tail void V is confirmed by three factors: electrical conductivity, pressure, and filling amount, so that the filling of the filler 3 can be determined with high accuracy.

[0052] Next, a modification of this embodiment will be described.

[0053] <First Modification> In the above embodiment, the measurement unit is an electrical conductivity meter 61 that measures electrical conductivity. However, the measurement unit is not limited to the electrical conductivity meter 61, and may be one that detects other index values as long as it can detect the difference in physical properties between the filler 3 and water. Furthermore, the filling confirmation system 60 is not limited to one that includes one measurement unit, and may be one that includes two or more measurement units that measure index values based on different physical properties.

[0054] For example, the measurement unit desirably includes, as an index value, a value based on at least one of electrical properties, viscosity, density, and pH. The electrical properties, viscosity, density, and pH are each based on physical properties that produce differences that allow the water and the filler 3 to be distinguished from each other, and therefore, by utilizing these, the water and the filler 3 can be easily distinguished from each other.

[0055] An example of a measurement unit that measures an index value based on viscosity is a filling sensor that uses a vibration device. This filling sensor vibrates the vibration device and detects the frequency characteristics of the vibration device, allowing it to identify materials that come into contact with the vibration device based on differences in viscosity. In general, this filling sensor can identify materials such as air, water, concrete, and grout.

[0056] The density can be measured, for example, by a so-called radioisotope (RI) instrument. The RI instrument emits gamma rays from a gamma ray source toward the target, and detects the gamma rays that scatter inside the target and escape from the sediment using a gamma ray detector. Since gamma rays have the property of being more likely to annihilate inside the target as their density increases, density can be measured by comparing the number of gamma rays emitted from the gamma ray source toward the sediment with the number of gamma rays detected using the gamma ray detector. The RI instrument may also use neutron rays instead of gamma rays. Such an RI instrument may be provided as a measurement unit to identify materials in the tail void V based on their density.

[0057] The measuring unit for measuring pH is, for example, a pH meter.

[0058] Even in the first modified example as described above, it is possible to distinguish between water and the filler 3, and therefore the same effects as those of the above embodiment can be achieved.

[0059] <Second Modification> In the above embodiment, the measuring unit measures index values that indicate the physical properties of the filler 3. In contrast, a temperature difference generally occurs between the filler 3 filled into the tail void V and the water flowing in from the natural ground.

[0060] 5, the measurement unit may be a thermometer 161 that measures the temperature inside the tail void V. In this case, the control device 70 stores a temperature threshold value that is set based on the temperature of the material injected into the tail void V by the injection device 50. If the measurement result of the thermometer 161 exceeds the temperature threshold value, it is determined that the filler material 3 has been filled.

[0061] The second modified example also makes it possible to distinguish between the filler 3 and water, and therefore provides the same effects as the above embodiment.

[0062] Furthermore, when seawater invades the tail void V, for example, when excavating a tunnel underwater, the difference in electrical conductivity between the filler 3 and seawater is smaller than the difference in electrical conductivity between the filler 3 and water (fresh water). In this way, when there is little difference in the physical properties between the invader that invades the tail void V and the filler 3, the accuracy of detecting the filling of the filler 3 can be improved by confirming the filling based on the measurement results of the thermometer 161, which is also a measurement unit, instead of or in addition to the filling confirmation based on the measurement results of the electrical conductivity meter 61, which is a measurement unit.

[0063] <Third Modification> In the above embodiment, the electrical conductivity meter 61 is a so-called two-terminal (two-electrode) type that applies a current or voltage to a pair of electrodes 61a, 61b and measures the electrical resistance. However, the electrical conductivity meter 61 may also be a so-called four-terminal (four-electrode) type that has a pair of application electrodes to which power is applied and a pair of measurement electrodes that measure the current flowing between the pair of application electrodes.

[0064] <Fourth Modification> The filling method of the above embodiment includes a filling detection step of detecting the filling of the filler 3 based on the electrical conductivity, pressure, and filling amount measured in the measurement step. In contrast, the filling detection step by the control device 70 is not essential. If the filling detection step is not performed by the control device 70, the electrical conductivity, pressure, and filling amount measured in the measurement step are displayed by the display 71. An on-site worker may determine whether the filler 3 has been filled based on the electrical conductivity, pressure, and filling amount displayed by the display 71.

[0065] Furthermore, in the filling detection process of the above embodiment, it was determined that the tail void V was filled with the filler 3 when filling was confirmed by all of the electrical conductivity, pressure, and filling amount, but it may also be determined that the tail void V was filled with the filler 3 if filling of the filler 3 was confirmed at least by the electrical conductivity. Furthermore, the configurations of the pressure meter 62 and the flow meter 63 are not essential.

[0066] <Fifth Modification> In the filling confirmation system 60, not only the result indicating that the tail void V has been filled with the filler material 3 but also the filling status of the tail void V may be displayed on the display 71.

[0067] Specifically, since the segment ring 1 is formed by connecting divided segments 2 in the circumferential direction, the position of the segment 2 where the injection hole 2a is formed may differ for each segment ring 1. In other words, the filling position of the filler 3 may differ depending on the segment ring 1.

[0068] In contrast, in the above embodiment, eight electrical conductivity meters 61 are provided at equal intervals in the circumferential direction. Therefore, by observing the measurement results of the eight electrical conductivity meters 61, the filling status of the filler 3 in the circumferential direction (distribution of the filler 3) can be grasped. By using the measurement results of the eight electrical conductivity meters 61, it is possible to perform 3D mapping of the filling status of the filler 3. According to this modification, the filling status of the filler 3 can be grasped more clearly, thereby improving work efficiency.

[0069] The filling of the filler 3 is not limited to a configuration in which it is carried out through the injection hole 2a of the segment ring 1, and although not shown, for example, piping may be provided along or inside the skin plate 10, an injection hole may be provided at the rear end of the skin plate 10, and the filler 3 may be injected from the front side of the tail void V.

[0070] <Sixth Modification> In the above embodiment, the measuring unit is used to confirm the filling of the tail void V. In contrast, the shield tunneling machine 100 may further include a measuring instrument similar to the measuring unit to detect leakage of filler material between the outer periphery of the skin plate 10 and the inner wall of the natural ground, and between the inner periphery of the skin plate 10 and the outer periphery of the segment ring 1.

[0071] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments. [Explanation of symbols]

[0072] 100 Shield tunneling machine (tunnel boring machine) 1 Segment ring (lining) 3 Filling material 10 Skin Plate (torso) 20 Cutter head (excavation part) 35 Backflow prevention plate (sealing part) 50 Injection device 61 Electrical conductivity meter (measurement unit) 62 Pressure gauge (pressure measurement part) 63 Flow meter (filling amount measuring section) 70 Control device 161 Thermometer (measuring part)

Claims

1. A tunnel boring machine that excavates the ground while covering the inner wall of the excavated hole with a lining to construct a tunnel, A cylindrical body extending along the axial direction of the tunnel; an excavation unit that is rotationally driven at the front of the body; an injection device that fills a filler material into the gap between the inner wall and the lining body; A measuring unit is provided at the rear end of the body in the excavation direction and at a position facing the gap between the inner wall and the lining body; a control device that acquires the measurement results of the measurement unit, The measuring unit is configured to be able to measure an index value indicating a physical property of the filler filled in the gap, the control device determines whether a pre-stored threshold value for the index value of the filler matches a measurement result of the index value measured by the measurement unit. Tunnel boring machine.

2. 2. A tunnel boring machine according to claim 1, The index value measured by the measurement unit includes a value based on at least one of electrical properties, viscosity, density, and pH. Tunnel boring machine.

3. A tunnel boring machine according to claim 1, a plurality of measuring units for measuring the index values based on different physical properties among electrical properties, viscosity, density, and pH as the index values; Tunnel boring machine.

4. A tunnel boring machine according to any one of claims 1 to 3, Further provided is a pressure measuring unit for measuring the pressure in the gap, The control device acquires the measurement result of the pressure measurement unit, and when the measurement result of the measurement unit indicates the filler and the measurement result of the pressure measurement unit is equal to or greater than a predetermined threshold, determines that the filler has been filled into the gap. Tunnel boring machine.

5. 5. A tunnel boring machine according to claim 4, a filling amount measuring unit for measuring the amount of the filler filled into the gap from the injection device, The control device determines that the gap is filled with the filler when the measurement result of the measurement unit indicates the filler, the measurement result of the pressure measurement unit is equal to or greater than the threshold value, and the amount of the filler filled into the gap is equal to or greater than the volume of the gap. Tunnel boring machine.

6. A tunnel boring machine according to any one of claims 1 to 5, The container further includes a sealing portion provided on the outer periphery of the body, which seals between the outer periphery of the body and the inner wall. Tunnel boring machine.

7. A filling method for filling a filler material between an inner wall of a drilled hole and a lining body covering the inner periphery of the inner wall, an injection step of injecting the filler into the gap between the inner wall and the outer peripheral surface of the lining body; a measuring step of measuring an index value indicating a physical property of a filler filled in the gap by a measuring unit provided so as to face the gap between the inner wall and the outer peripheral surface of the lining body; a filling detection step of confirming that the gap is filled with the filler material based on the measurement result in the measurement step, In the filling detection step, it is determined whether a predetermined threshold value of the index value matches the measurement result of the index value in the measurement step. How to fill the filler.

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