Injection device and tunnel boring machine

Abstract

To effectively inject grout into excavated soil.SOLUTION: An injection device 20 of a tunnel boring machine is an injection device for a tunnel boring machine comprising a cylindrical boring machine body, a cutter head 11 rotatably mounted on a front end of the boring machine body, and a partition wall arranged rearward of the cutter head 11, and comprises an injection nozzle 22 that protrudes in the fore-and-aft direction of the boring machine body from a surface of the cutter head 11 or the partition wall and injects an injection liquid containing at least one of water, a mud-adding agent or a foaming agent into the excavated soil, an injection port 22c that is provided on the part of the injection nozzle 22 that protrudes from the surface and sprays the injection liquid in an injection direction D1 that intersects the fore-and-aft direction, and a rotation mechanism (motor 23) that rotates the injection nozzle 22 around the central axis C1 of the injection nozzle 22.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an injection device and a tunnel boring machine. [Background technology]

[0002] Generally, a tunnel boring machine excavates a tunnel by rotating a cutter head and using multiple cutter bits attached to the front of the cutter head to excavate the ground in front of it to form a tunnel face. The excavated soil and sand produced by tunnel excavation is temporarily stored in a chamber on the back side of the cutter head, and then transported and discharged rearward by a screw conveyor installed inside the tunnel boring machine.

[0003] When excavating a tunnel using a tunnel boring machine, as disclosed in Patent Document 1, for example, injection fluids such as water, mud-adding material, and aerating material may be injected into the excavated soil to prevent the excavated soil from adhering to the tunnel boring machine and causing blockages, and to ensure stable excavation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-193791 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional techniques, situations may arise in which the grouting solution is not sufficiently injected into the excavated soil. For example, the grouting solution is difficult to penetrate into excavated soil that has high viscosity and tends to stick, which makes it prone to sticking. Furthermore, for example, situations may arise in which the grouting solution is only injected into a specific range of the excavated soil, resulting in insufficient injection of the grouting solution into other ranges of the excavated soil.

[0006] In view of the above, an object of the present invention is to provide an injection device and a tunnel boring machine that can effectively inject grout into excavated soil. [Means for solving the problem]

[0007] In order to solve the above problems, the injection device of the present invention is an injection device for a tunnel boring machine which comprises a cylindrical boring machine body, a cutter head rotatably mounted on the front end of the boring machine body, and a partition wall which is arranged rearward of the cutter head, and which comprises an injection nozzle which protrudes in the fore-and-aft direction of the boring machine body from the surface of the cutter head or the partition wall and which injects an injection liquid containing at least one of water, a mud-adding material or an aerating material into the excavated soil, an injection port which is provided in the part of the injection nozzle which protrudes from the surface and which injects the injection liquid in an injection direction which intersects the fore-and-aft direction, and a rotation mechanism which rotates the injection nozzle around the central axis of the injection nozzle.

[0008] The ejection direction may be perpendicular to the front-to-rear direction.

[0009] The jetting direction may be a direction inclined forward with respect to a direction perpendicular to the front-rear direction.

[0010] The injection nozzle may be formed with an injection liquid flow path extending along the central axis and through which the injection liquid flows, and the injection port may communicate between the outer circumferential surface of the injection nozzle and the injection liquid flow path.

[0011] The injectate channel may be connected to a source of injectate on an opposite side of the surface from the injection orifice.

[0012] An opening and closing member may be provided which closes the injection port when injection liquid is not being injected and opens the injection port when injection liquid is being injected.

[0013] The inlet flow path extends further toward the tip of the injection nozzle than the injection port, and the opening / closing member is disposed inside the injection liquid flow path and includes a valve body that closes or opens the injection port and a biasing member that biases the valve body toward the rear end of the injection nozzle, and when injection liquid is not being injected, the injection port is closed by the valve body, and when injection liquid is being injected, the valve body is pushed toward the tip by the injection liquid, opening the injection port.

[0014] A moving mechanism for moving the nozzle in the front-rear direction may be provided.

[0015] The movement mechanism may move the injection nozzle in the front-to-rear direction, thereby moving the injection orifice in the front-to-rear direction.

[0016] The movement mechanism may close the injection port with the surrounding members by moving the injection nozzle back and forth when injection liquid is not being injected.

[0017] In order to solve the above problem, a tunnel boring machine according to the present invention is equipped with the above injection device. [Effects of the Invention]

[0018] According to the present invention, it is possible to effectively inject grout into excavated soil. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a cross-sectional schematic diagram showing the overall configuration of a tunnel boring machine according to an embodiment of the present invention. FIG. [Figure 2] 1 is a cross-sectional view illustrating an injection device according to an embodiment of the present invention. [Figure 3] 1 is a schematic front view showing an injection device according to an embodiment of the present invention. [Figure 4] FIG. 10 is a cross-sectional view showing a first modified example of an injection device according to the present invention. [Figure 5] FIG. 10 is a cross-sectional view showing a second modified example of an injection device according to the present invention. [Figure 6]FIG. 10 is a cross-sectional view showing a state during injection of an injection device according to a second modification of the present invention. [Figure 7] FIG. 10 is a cross-sectional view showing a third modified example of an injection device according to the present invention. [Figure 8] 8 is a schematic cross-sectional view of a third modified example of the injection device of the present invention, showing the injection nozzle having moved forward from the state shown in FIG. 7. [Figure 9] FIG. 10 is a cross-sectional view showing a fourth modified example of an injection device according to the present invention. [Figure 10] 10 is a schematic cross-sectional view of a fourth modified example of the injection device of the present invention, showing the injection nozzle having moved rearward from the state shown in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0021] First, the overall configuration of a tunnel boring machine 1 according to an embodiment of the present invention will be described with reference to Figure 1. Figure 1 is a schematic cross-sectional view showing the overall configuration of the tunnel boring machine 1. Note that arrow A1 in Figure 1 indicates the traveling direction of the tunnel boring machine 1. Hereinafter, the traveling direction of the tunnel boring machine 1 (leftward in Figure 1) will also be referred to as the forward direction, and the direction opposite to the traveling direction (rightward in Figure 1) will also be referred to as the backward direction.

[0022] The tunnel boring machine 1 is an earth pressure type (including mud pressure type) shield boring machine capable of excavating natural ground. As shown in Figure 1, the tunnel boring machine 1 comprises an excavation machine main body 10. The excavation machine main body 10 is tubular (for example, cylindrical or rectangular tubular). The axial direction of the excavation machine main body 10 coincides with the tunnel excavation direction. Hereinafter, the axial direction of the excavation machine main body 10 will also be simply referred to as the axial direction, the radial direction of the excavation machine main body 10 will also be simply referred to as the radial direction, and the circumferential direction of the excavation machine main body 10 will also be simply referred to as the circumferential direction.

[0023] The excavator body 10 includes a skin plate 10a. The skin plate 10a is the part of the excavator body 10 that comes into contact with the inner wall surface (pit wall) of the natural ground formed by excavation by the tunnel boring machine 1. The skin plate 10a is tubular (for example, cylindrical or rectangular tubular) and forms the outer periphery of the excavator body 10.

[0024] A cutter head 11 is provided at the front end of the excavator body 10. The cutter head 11 is a roughly disk-shaped rotating body. The front end of a cutter central shaft 12 is fitted into the center of the cutter head 11, and the cutter head 11 is supported rotatably around the cutter central shaft 12.

[0025] The cutter head 11 includes an outer ring 11a, an inner ring 11b, cutter spokes 11c, a fishtail cutter 11d, and a cutter bit 11e. Of these, the outer ring 11a forms the outer periphery of the cutter head 11, and the inner ring 11b is disposed radially inward of the outer ring 11a. Furthermore, multiple cutter spokes 11c are disposed radially around the cutter central axis 12 on the front surface of the cutter head 11. A fishtail cutter 11d is attached to the center of the front surface of the cutter head 11. Furthermore, multiple cutter bits 11e are attached to the front surfaces of the cutter spokes 11c. The fishtail cutter 11d and the cutter bit 11e may or may not be detachable.

[0026] A plurality of openings are formed between the outer circumferential ring 11a, the inner circumferential ring 11b, and the cutter spokes 11c in the cutter head 11. The openings function as excavated soil intake ports for taking excavated soil generated when the cutter head 11 excavates the natural ground (face) into the excavator body 10 (into a chamber 17 described later).

[0027] A partition wall 13 is arranged behind the cutter head 11 on the excavator body 10. The partition wall 13 is a plate-shaped (for example, disc-shaped) wall arranged perpendicular to the axial direction (tunnel extension direction), and the outer edge of the partition wall 13 is attached to the inner peripheral surface of the excavator body 10. The cutter head 11 and the partition wall 13 are arranged at a predetermined distance in the axial direction (tunnel extension direction). Various pieces of equipment for the tunnel boring machine 1 are arranged behind the partition wall 13, and the partition wall 13 isolates the equipment from the excavated soil generated at the face. A discharge port 13a, which is an opening for discharging the excavated soil, is formed in the lower part of the partition wall 13.

[0028] A cutter central shaft 12 is rotatably supported at the center of the partition wall 13. Furthermore, an annular rotating ring 14 is supported on the partition wall 13 so as to be rotatable around the cutter central shaft 12. A plurality of connecting beams 15 are provided at a predetermined interval in the circumferential direction at the front of the rotating ring 14. The plurality of connecting beams 15 connect the cutter head 11 and the rotating ring 14. The front ends of the connecting beams 15 are connected to the connection between the inner ring 11b of the cutter head 11 and the cutter spokes 11c. Meanwhile, a ring gear 14a is provided at the rear of the rotating ring 14. The ring gear 14a may be either an externally toothed type or an internally toothed type. Furthermore, a cutter rotation motor 16 is provided behind the partition wall 13. A drive gear 16a of this cutter rotation motor 16 meshes with the ring gear 14a of the rotating ring 14.

[0029] By driving the cutter rotation motor 16, the rotation of the drive gear 16a is transmitted from the ring gear 14a to the rotating ring 14 and the connecting beam 15. This allows the cutter head 11 to rotate around the cutter central axis 12. As a result, the front face of the rotating cutter head 11 is pressed against the natural ground (face), allowing the natural ground to be excavated. In Figure 1, the face 2, which is the surface excavated by the cutter head 11, is shown by a dashed line.

[0030] A chamber 17 is defined between the cutter head 11 and the partition wall 13. The chamber 17 is a space (for example, a substantially cylindrical space) defined by the rear surface of the cutter head 11, the front surface of the partition wall 13, and the inner peripheral surface of the excavator body 10. Excavated earth and sand generated when the cutter head 11 excavates the natural ground is taken into the chamber 17 through the opening (excavated earth and sand intake port) formed through the cutter head 11. The chamber 17 functions as a space (room) for temporarily storing the excavated earth and sand. The excavated earth and sand taken into the chamber 17 is discharged from the chamber 17 into the screw conveyor 18 through the discharge port 13a at the bottom of the partition wall 13.

[0031] The screw conveyor 18 is provided on the rear side of the partition wall 13 inside the excavator body 10. The screw conveyor 18 is arranged inside the excavator body 10 so that it slopes upward as it moves toward the rear. The opening at the front end of the screw conveyor 18 is connected to the discharge port 13a of the partition wall 13. As a result, the internal space of the screw conveyor 18 communicates with the chamber 17 through the discharge port 13a of the partition wall 13. The screw conveyor 18 is provided with a screw blade 18a, which is a screw-shaped rotating body with helical blades. By driving the screw blade 18a to rotate, the excavated soil stored in the chamber 17 can be taken into the screw conveyor 18, transported toward the rear of the excavator body 10, and discharged.

[0032] An erector device (not shown) is provided on the rear side of the partition wall 13 of the excavator body 10. The erector device is provided so as to be movable in the axial, radial and circumferential directions (i.e., the tunnel extension direction, the tunnel radial direction and the tunnel circumferential direction) of the excavator body 10. The erector device is capable of gripping the segments S, which are lining members, and assembles the gripped segments S along the inner wall surface of the natural ground.

[0033] The segments S are ring pieces with a curved shape that follows the inner wall surface of the excavated natural ground. By driving the erector device, multiple segments S can be assembled in a ring shape along the circumferential direction. This allows the tunnel to be lined with multiple segments S, preventing the inner wall surface of the natural ground from collapsing.

[0034] A plurality of shield jacks 19 are provided within the excavator body 10 at intervals from one another in the circumferential direction. Each shield jack 19 is provided so as to extend in the tunnel extension direction along the inner circumferential surface of the excavator body 10. The shield jack 19 is, for example, a hydraulic jack, but other types of jacks, actuators, etc. may be used as long as they are capable of generating thrust for the tunnel boring machine 1. An extendable drive rod 19a is provided at the rear end of each shield jack 19. The tip of the drive rod 19a faces the front end face of the existing segment S. By extending the drive rod 19a of the shield jack 19 rearward and pressing against the segment S, a thrust reaction force (i.e., thrust) can be applied to the excavator body 10. In other words, the thrust generated when the shield jack 19 presses against the segment S enables the excavator body 10 to move forward.

[0035] It should be noted that while the tunnel boring machine 1 shown in FIG. 1 is a type in which thrust is transmitted from the front end of the shield jack 19 to the boring machine main body 10, the tunnel boring machine according to the present invention is not limited to this example. For example, the tunnel boring machine according to the present invention may be a type in which thrust is transmitted from the rear portion of the shield jack 19 to the boring machine main body 10. It should be noted that the tunnel boring machine according to the present invention may be a type in which the tunnel boring machine has a bending function and is propelled by pushing the front body, or a type in which the tunnel boring function and is propelled by pushing the rear body. Furthermore, the tunnel boring machine according to the present invention may be a tunnel boring machine in which the drive system for the cutter head 11 is a system other than the intermediate support system shown in FIG. 1 (for example, a center shaft system, a central axle support system, or a peripheral support system).

[0036] The tunnel boring machine 1 is equipped with an injection device (see injection device 20 in FIG. 2 and other figures described later) for injecting grout such as water, mud-adding agent, or aerating agent into the excavated soil. In this embodiment, by incorporating some improvements into the injection device, it is possible to effectively inject the grout into the excavated soil, as will be described later. The injection device will be described in detail below with reference to FIGS. 2 and 3.

[0037] Fig. 2 is a schematic cross-sectional view showing the injection device 20 according to this embodiment. Fig. 3 is a schematic front view showing the injection device 20 according to this embodiment. Specifically, Fig. 3 is a view of the injection device 20 as seen from the front side of the tunnel boring machine 1.

[0038] In the example of FIG. 2, the injection device 20 is provided on the cutter spoke 11c. However, as will be described later, the installation position of the injection device 20 is not limited to the example of FIG. 2. The injection device 20 may be provided, for example, in only one location on the cutter head 11, or in multiple locations. However, the number and arrangement of the injection devices 20 are not particularly limited. As shown in FIG. 2, the injection device 20 includes a housing 21, an injection nozzle 22, and a motor 23.

[0039] The housing 21 has a generally cylindrical shape with both ends open. The housing 21 extends in the front-rear direction and is attached to the rear side of the portion of the cutter spokes 11c that forms the front face F1 of the cutter head 11. The housing 21 may be attached to the cutter spokes 11c by screw fastening or welding. For example, the front end surface of the housing 21 forms part of the front face F1 of the cutter head 11. That is, the front-rear position of the front end surface of the housing 21 coincides with the front face F1 of the cutter head 11. The housing 21 extends rearward from the portion of the cutter spokes 11c to which the housing 21 is attached. That is, the rear end surface of the housing 21 is located inside the cutter head 11, rearward of the front face F1 of the cutter head 11.

[0040] The injection nozzle 22 has a generally cylindrical shape with both ends closed. The injection nozzle 22 extends in the front-to-rear direction and is disposed coaxially with the housing 21. The outer circumferential surface of the injection nozzle 22 is fitted to the inner circumferential surface of the housing 21. The injection nozzle 22 is rotatable about its central axis C1. Specifically, the injection nozzle 22 is rotatably supported by bearings 24a and 24b provided on the inner circumferential surface of the housing 21. The front end of the injection nozzle 22 is located forward of the front surface F1 of the cutter head 11, and the rear end of the injection nozzle 22 is located rearward of the front surface F1 of the cutter head 11. In other words, the injection nozzle 22 extends from forward to rearward of the front surface F1 of the cutter head 11.

[0041] Motor 23 corresponds to an example of a rotation mechanism that rotates injection nozzle 22 around the central axis C1 of injection nozzle 22. Motor 23 is located rearward of housing 21 and is arranged coaxially with housing 21. Output shaft 23a of motor 23 is connected to injection nozzle 22. Output shaft 23a of motor 23 is rotatable integrally with injection nozzle 22. Therefore, when motor 23 is driven and output shaft 23a rotates, injection nozzle 22 rotates integrally with output shaft 23a. The drive of motor 23 is controlled, for example, by a control device (not shown). The drive system of motor 23 may be hydraulic or electric.

[0042] Here, an infusion liquid supply source S1 is connected to infusion device 20, and the infusion liquid is sent from supply source S1. An infusion liquid flow path is formed in infusion device 20, and the infusion liquid flows through this flow path. The infusion liquid flow path formed in infusion device 20 will be described below.

[0043] Injection nozzle 22 has injection liquid flow path 22a, inlet 22b, and ejection port 22c. In injection nozzle 22, injection liquid flows in through inlet 22b, flows through injection liquid flow path 22a, and is ejected to the outside from ejection port 22c.

[0044] The grout flow path 22a extends along the central axis C1 of the injection nozzle 22. For example, the grout flow path 22a has a cylindrical shape extending in the front-to-rear direction of the tunnel boring machine 1. The front end of the grout flow path 22a is located forward of the front face F1 of the cutter head 11, and the rear end of the grout flow path 22a is located rearward of the front face F1 of the cutter head 11. In other words, the grout flow path 22a extends from forward to rearward of the front face F1 of the cutter head 11.

[0045] Inlet 22b is provided in injection nozzle 22 inside cutter head 11. That is, inlet 22b is provided in a portion of injection nozzle 22 rearward of front surface F1 of cutter head 11. Inlet 22b connects the outer circumferential surface of injection nozzle 22 with injection liquid flow path 22a. Inlet 22b extends in the radial direction of injection nozzle 22. For example, inlet 22b is formed in a cylindrical shape having a central axis in the radial direction of injection nozzle 22.

[0046] Jet port 22c is provided in a portion of injection nozzle 22 that protrudes from the front surface F1 of cutter head 11. In other words, jet port 22c is provided in a portion of injection nozzle 22 that is forward of the front surface F1 of cutter head 11. Jet port 22c communicates with the outer circumferential surface of injection nozzle 22 and injection liquid flow path 22a. Jet port 22c extends in the radial direction of injection nozzle 22. For example, jet port 22c is formed in a cylindrical shape having a central axis in the radial direction of injection nozzle 22.

[0047] Housing 21 has an annular groove 21a and an inlet 21b. In Fig. 2, annular groove 21a is shown by a dashed line for ease of understanding. In housing 21, an injection liquid flows in through inlet 21b, flows through annular groove 21a, and is sent to inlet 22b of injection nozzle 22.

[0048] The annular groove 21a is provided inside the cutter head 11 of the housing 21. In other words, the annular groove 21a is provided in a portion of the housing 21 rearward of the front surface F1 of the cutter head 11. The annular groove 21a is recessed radially outward from the inner peripheral surface of the housing 21 and is an annular groove that extends in the circumferential direction of the housing 21. The front-to-rear position of the annular groove 21a coincides with the front-to-rear position of the inlet 22b of the injection nozzle 22, and the annular groove 21a covers the entire circumferential area of ​​the injection nozzle 22. Therefore, the annular groove 21a communicates with the inlet 22b of the injection nozzle 22.

[0049] The inlet 21b is provided inside the cutter head 11 of the housing 21. That is, the inlet 21b is provided in a portion of the housing 21 rearward of the front surface F1 of the cutter head 11. The inlet 21b communicates with the outer peripheral surface of the housing 21 and the annular groove 21a. The inlet 21b extends in the radial direction of the housing 21. For example, the inlet 21b is formed in a cylindrical shape having a central axis in the radial direction of the housing 21.

[0050] The injection liquid supply source S1 is connected to the inlet 21b of the housing 21 via an injection liquid flow path. Therefore, the injection liquid is sent from the supply source S1 to the inlet 21b. As shown by arrow A2 in FIG. 2, the injection liquid sent to the inlet 21b is sent to the annular groove 21a. Then, the injection liquid sent to the annular groove 21a is sent to the injection liquid flow path 22a via the inlet 22b of the injection nozzle 22. The injection liquid sent to the injection liquid flow path 22a is sprayed to the outside from the spray port 22c.

[0051] The supply of injection liquid from supply source S1 to injection device 20 is performed, for example, by controlling the operation of a pump (not shown) provided in a flow path connecting supply source S1 and inlet 21b of housing 21. The operation of the pump is controlled by a control device (not shown).

[0052] The injection port 22c of the injection nozzle 22 faces in an injection direction D1 that intersects with the front-to-rear direction of the excavator body 10. Specifically, the injection direction D1 is a direction perpendicular to the front-to-rear direction of the excavator body 10. Therefore, the injection port 22c injects the injection liquid in the injection direction D1 that is perpendicular to the front-to-rear direction of the excavator body 10.

[0053] The above-mentioned bearing 24a is disposed forward of the annular groove 21a of the housing 21. The above-mentioned bearing 24b is disposed rearward of the annular groove 21a of the housing 21.

[0054] Here, seal members 25a, 25b, and 25c are provided between the inner circumferential surface of housing 21 and the outer circumferential surface of injection nozzle 22. Seal members 25a, 25b, and 25c are, for example, O-rings. Seal member 25a is positioned forward of bearing 24a. Seal member 25a prevents excavated soil from flowing into bearing 24a from in front of cutter head 11. Seal member 25b is positioned rearward of bearing 24a and forward of annular groove 21a of housing 21. Seal member 25c is positioned rearward of annular groove 21a of housing 21 and forward of bearing 24b. Seal members 25b and 25c prevent the injection liquid sent from supply source S1 to housing 21 from leaking out without being sent to injection nozzle 22.

[0055] As described above, motor 23 can rotate injection nozzle 22 around central axis C1 of injection nozzle 22. Therefore, as shown by arrow A3 in Figure 3, injection direction D1 of injection port 22c can be rotated around central axis C1.

[0056] As described above, the injection device 20 according to this embodiment includes the injection nozzle 22, which protrudes from the surface of the cutter head 11 (the front surface F1 in the above example) in the front-rear direction (the front direction in the above example) of the excavator body 10 and injects a grout containing at least one of water, a mud-adding agent, and an aerating agent into the excavated soil; the injection port 22c, which is provided on the portion of the injection nozzle 22 protruding from the surface and which injects the grout in a spray direction D1 that intersects with the front-rear direction of the excavator body 10; and a rotation mechanism (the motor 23 in the above example) that rotates the injection nozzle 22 about the central axis C1 of the injection nozzle 22. Therefore, the grout can be sprayed in the spray direction D1 from the injection port 22c formed in the injection nozzle 22 while the rotation mechanism rotates the injection nozzle 22 about the central axis C1. This allows the location of the excavated soil to which the grout is injected to be varied, thereby preventing the grout from being injected only into a specific range of the excavated soil. Therefore, the grout can be sufficiently infiltrated into excavated soil that is highly viscous and prone to sticking, for example, and the grout can be effectively injected into the excavated soil.

[0057] Specifically, as described above, the injection direction D1 is a direction perpendicular to the front-rear direction of the excavator body 10. Therefore, by continuously rotating the injection nozzle 22, the injection direction D1 can be continuously changed in the circumferential direction of the injection nozzle 22. This makes it easier to inject the grout into the excavated earth and sand that is present in the entire circumferential direction of the injection nozzle 22 among the excavated earth and sand that has accumulated on the surface of the member on which the injection nozzle 22 is provided (in the above example, the front surface F1 of the cutter head 11). Therefore, for example, if the excavated earth and sand become stuck on the front surface F1 of the cutter head 11, it is easier to inject the grout into the excavated earth and sand from the injection nozzle 22 and remove the excavated earth and sand. However, as will be described later, the injection direction D1 may be any direction that intersects the front-rear direction of the excavator body 10, and is not limited to the example shown in FIG. 2.

[0058] Specifically, as described above, injection nozzle 22 is formed with injection liquid flow path 22a that extends along central axis C1 and through which injection liquid flows, and injection port 22c connects the outer circumferential surface of injection nozzle 22 with injection liquid flow path 22a. As a result, as injection nozzle 22 rotates, only the position of injection port 22c of injection nozzle 22 changes, allowing the injection liquid to flow smoothly within injection nozzle 22.

[0059] Specifically, as described above, the grout flow path 22a is connected to the grout supply source S1 on the opposite side of the injection port 22c from the surface (in the above example, the front surface F1 of the cutter head 11). This allows the grout supply source S1 to be installed in a location that is not exposed to excavated soil (for example, a location behind the partition wall 13), and the grout can be stably supplied from the supply source S1 to the injection nozzle 22.

[0060] In the above example, the injection nozzle 22 is provided on the cutter head 11 so as to protrude forward from the front surface F1 of the cutter head 11, and the grout is injected into the excavated soil located in front of the cutter head 11. However, the injection nozzle 22 may protrude from the surface of the cutter head 11 or the partition wall 13 in the front-to-rear direction of the excavator body 10. This also applies to the injection devices 20A, 20B, 20C, and 20D described below. For example, the injection nozzle 22 may be provided on the partition wall 13 so as to inject grout into the excavated soil located in the chamber 17, which is the space in front of the partition wall 13. In this case, for example, the injection nozzle 22 is provided on the partition wall 13 so as to protrude forward from the front surface of the partition wall 13. The injection nozzle 22 may also be provided on a fixed wing protruding from the partition wall 13 toward the chamber 17. In this case, the injection nozzle 22 can inject grout into the excavated soil located in the chamber 17 near the front surface of the partition wall 13. Furthermore, for example, the injection nozzle 22 may protrude from the rear surface of the cutter head 11 toward the rear chamber 17. In this case, the injection liquid can be injected from the injection nozzle 22 into the excavated soil near the rear surface of the cutter head 11 in the chamber 17.

[0061] Various modifications of the above-described injection device 20 will be described below in order with reference to FIGS.

[0062] 4 is a cross-sectional view showing an injection device 20A according to a first modification of the present invention. Injection device 20A according to the first modification is different from injection device 20 described above in that injection direction D1 of injection port 22c. In all other respects, it is the same as injection device 20 described above.

[0063] As shown in FIG. 4, in the injection device 20A, unlike the above-described injection device 20, the injection direction D1 of the injection port 22c of the injection nozzle 22 is a direction that is inclined forward with respect to the direction perpendicular to the front-to-rear direction of the excavator body 10. In other words, the injection port 22c faces in a direction that is inclined forward with respect to the direction perpendicular to the front-to-rear direction of the excavator body 10. Therefore, the injection port 22c injects the injection liquid in the injection direction D1 that is inclined forward with respect to the direction perpendicular to the front-to-rear direction of the excavator body 10. In other words, the injection direction D1 is a direction that is inclined forward with respect to the radial direction of the excavator body 10. Note that the direction that is inclined forward with respect to the direction perpendicular to the front-to-rear direction of the excavator body 10 corresponds to the direction in which the injection nozzle 22 moves forward as it moves radially outward.

[0064] As described above, in the injection device 20A according to the first modification, the injection direction D1 is a direction inclined forward with respect to a direction perpendicular to the fore-and-aft direction of the excavator body 10. This makes it easier to inject the grout into a wider area of ​​the excavated soil further forward than the area near the member on which the injection nozzle 22 is provided (the cutter head 11 in the above example). Therefore, for example, the grout can be injected from the injection nozzle 22 into the excavated soil present in a wider area in front of the cutter head 11. Therefore, the grout can be injected into and mixed with the excavated soil at an early stage before the excavated soil is taken in through the soil intake port of the cutter head 11, thereby fluidizing the excavated soil.

[0065] 5 is a cross-sectional view showing a second modified injection device 20B according to the present invention. Injection device 20B according to the second modified embodiment differs from injection device 20 described above in that it includes an opening / closing member M1 that can open and close injection port 22c. In all other respects, it is the same as injection device 20 described above.

[0066] Fig. 5 shows an enlarged view of the tip of injection nozzle 22 in injection device 20B, including injection port 22c. As shown in Fig. 5, in injection device 20B, injection nozzle 22 has, in addition to injection liquid flow path 22a, inlet 22b, and injection port 22c described above, main body 22d, lid 22e, sealing member 22f, valve body 22g, sealing member 22h, and biasing member 22i. In the example of Fig. 5, opening / closing member M1 includes valve body 22g and biasing member 22i.

[0067] Main body 22d is a component that forms the majority of injection nozzle 22. Main body 22d has a generally cylindrical shape with an open front end and a closed rear end. Main body 22d extends in the front-rear direction and is disposed coaxially with housing 21. The inner circumferential surface of main body 22d defines injection liquid flow path 22a.

[0068] In injection device 20B, injection fluid flow path 22a includes small diameter portion 22a1 and large diameter portion 22a2. Small diameter portion 22a1 and large diameter portion 22a2 have a cylindrical shape extending in the front-rear direction and are arranged coaxially with each other. Large diameter portion 22a2 is located at the front end of injection fluid flow path 22a. Large diameter portion 22a2 extends further toward the tip of injection nozzle 22 than injection port 22c and extends from forward to rearward of injection port 22c. The inner diameter of large diameter portion 22a2 is larger than the inner diameter of small diameter portion 22a1. Large diameter portion 22a2 is connected to injection port 22c. Small diameter portion 22a1 extends rearward from the rear end of large diameter portion 22a2 and is connected to inlet 22b. The inner circumferential surface of the main body 22d is formed with a tapered portion 22d1 at a connecting portion between the small diameter portion 22a1 and the large diameter portion 22a2, the tapered portion 22d1 being inclined so that the inner diameter increases toward the front.

[0069] The lid portion 22e closes the opening at the front end of the main body 22d. The lid portion 22e has a generally cylindrical shape and is arranged coaxially with the main body 22d. A protrusion 22e1 protruding rearward from the rear surface of the lid portion 22e is provided on the rear surface of the lid portion 22e. The protrusion 22e1 is arranged coaxially with the main body 22d. A seal member 22f is provided on the outer peripheral surface of the lid portion 22e that contacts the inner peripheral surface of the main body 22d. The seal member 22f is, for example, an O-ring. The seal member 22f prevents excavated soil from flowing into the injection nozzle 22 from ahead of the cutter head 11. The lid portion 22e may be attached to the main body 22d by, for example, screwing or welding.

[0070] The valve element 22g is accommodated in the large diameter portion 22a2 of the infusion liquid flow path 22a. The valve element 22g has a substantially cylindrical shape and is disposed coaxially with the main body 22d. The valve element 22g slides in the front-rear direction within the large diameter portion 22a2. The outer circumferential surface of the valve element 22g contacts the inner circumferential surface of the main body 22d. The rear surface of the valve element 22g has, for example, a substantially spherical shape. A recessed portion 22g1 recessed rearward from the front surface is formed in the front surface of the valve element 22g. The recessed portion 22g1 has a cylindrical shape and is disposed coaxially with the main body 22d. A seal member 22h is provided on the portion of the outer circumferential surface of the valve element 22g that contacts the inner circumferential surface of the main body 22d. The seal member 22h is, for example, an O-ring. The sealing member 22h prevents the injection liquid from flowing into the space between the valve body 22g and the lid portion 22e (the installation space of the biasing member 22i).

[0071] The biasing member 22i is, for example, an elastic member such as a spring. The biasing member 22i is disposed between the cover portion 22e and the valve body 22g in such a position that the biasing member 22i expands and contracts in the front-to-rear direction. Specifically, the protrusion 22e1 of the cover portion 22e is inserted into the inside of the biasing member 22i from the front, and the front end of the biasing member 22i abuts against the rear surface of the cover portion 22e. The outer peripheral surface of the protrusion 22e1 is covered by the inner peripheral surface of the biasing member 22i. Fluctuations in the radial position of the biasing member 22i are stabilized by the outer peripheral surface of the protrusion 22e1. Furthermore, the biasing member 22i is inserted into the interior of the recessed portion 22g1 of the valve body 22g from the front, and the rear end of the biasing member 22i abuts against the bottom surface of the recessed portion 22g1. The outer peripheral surface of the biasing member 22i is covered by the inner peripheral surface of the recessed portion 22g1. Fluctuations in the radial position of biasing member 22i are also stabilized by the inner circumferential surface of recessed portion 22g1. Biasing member 22i is in a contracted state relative to its natural length. Therefore, valve body 22g is biased rearward (i.e., toward the rear end of injection nozzle 22) by biasing member 22i. Note that at least one of protrusion 22e1 and recessed portion 22g1 is intended to stabilize biasing member 22i, and may be omitted if the state of biasing member 22i can be maintained without it.

[0072] When the supply of injection liquid to injection nozzle 22 by a pump or the like is stopped and injection nozzle 22 is not spraying injection liquid, valve element 22g is biased rearward by biasing member 22i and positioned at the rearmost position within the movable range of valve element 22g, as shown in Fig. 5. As a result, valve element 22g abuts against tapered portion 22d1 over the entire circumferential area, and the front end of small-diameter portion 22a1 of injection liquid flow path 22a is blocked by valve element 22g. Injection port 22c is then closed by valve element 22g.

[0073] FIG. 6 is a cross-sectional view showing a state during injection of injection device 20B according to a second modified example of the present invention. When injection nozzle 22 is being supplied with injection liquid by a pump or the like and injection nozzle 22 is injecting the injection liquid, the injection liquid flows from rear to front in small-diameter portion 22a1 of injection liquid flow path 22a, as indicated by arrow A4 in FIG. 6. Then, valve element 22g is pushed forward (i.e., toward the tip of injection nozzle 22) by the injection liquid in small-diameter portion 22a1 against the biasing force of biasing member 22i. This causes small-diameter portion 22a1, large-diameter portion 22a2, and injection port 22c to communicate with each other, opening injection port 22c. Thus, injection liquid is injected from injection port 22c in injection direction D1.

[0074] As described above, injection device 20B according to the second modification includes opening / closing member M1 that closes injection port 22c when injection of injection liquid is not being performed and opens injection port 22c when injection of injection liquid is being performed. This prevents soil and sand from entering injection nozzle 22 from the outside through injection port 22c when injection of injection liquid is not being performed. It also prevents injection liquid from leaking from injection port 22c when injection of injection liquid is not being performed.

[0075] Specifically, as described above, the grout flow path 22a extends further toward the tip of the injection nozzle 22 than the injection port 22c. The open-close member M1 is disposed inside the grout flow path 22a and includes a valve element 22g that closes or opens the injection port 22c and a biasing member 22i that biases the valve element 22g toward the rear end of the injection nozzle 22. When the grout is not being injected, the injection port 22c is closed by the valve element 22g. When the grout is being injected, the valve element 22g is pushed toward the tip by the grout, opening the injection port 22c. This more reliably closes the injection port 22c when the grout is not being injected. Therefore, it is possible to more reliably prevent soil from entering the injection nozzle 22 from the outside through the injection port 22c when the grout is not being injected.

[0076] In the above description, an example has been described in which opening-closing member M1 includes valve body 22g and biasing member 22i. However, opening-closing member M1 is not limited to the above example. For example, in injection device 20B, biasing member 22i may be replaced by a spring by sealing compressed air. Furthermore, for example, opening-closing member M1 may be a rubber annular member wrapped around the entire outer circumferential surface of injection nozzle 22 to close jet orifice 22c. In this case, when the supply of injection liquid to injection nozzle 22 by a pump or the like is stopped and injection nozzle 22 is not injecting the injection liquid, the annular member closes jet orifice 22c. On the other hand, when injection nozzle 22 is being supplied with injection liquid by a pump or the like and injection nozzle 22 is injecting the injection liquid, the annular member is pushed radially outward by the injection liquid and moves, opening jet orifice 22c.

[0077] 7 is a cross-sectional schematic diagram showing an injection device 20C according to a third modified example of the present invention. Injection device 20C according to the third modified example differs from injection device 20 described above in that housing 21 and injection nozzle 22 are movable in the front-rear direction and a movement mechanism 30 is added to move housing 21 and injection nozzle 22 in the front-rear direction. In all other respects, injection device 20C is similar to injection device 20 described above.

[0078] As shown in FIG. 7, in the injection device 20C, a cylindrical portion 11f is provided at a location of the cutter spokes 11c where the housing 21 is installed. The cylindrical portion 11f extends rearward from a portion of the cutter spokes 11c that forms the front surface F1 of the cutter head 11. The housing 21 is disposed coaxially with the cylindrical portion 11f and is fitted to the inner peripheral surface of the cylindrical portion 11f. The outer peripheral surface of the housing 21 contacts the inner peripheral surface of the cylindrical portion 11f. The front-to-rear position of the front end of the cylindrical portion 11f is approximately the same as the front end of the housing 21. The rear end of the cylindrical portion 11f is located forward of the rear end of the housing 21. The housing 21 is provided to be slidable in the front-to-rear direction within the cylindrical portion 11f. This allows the housing 21 and the injection nozzle 22 to move in the front-to-rear direction.

[0079] The housing 21 is supported by a bearing 24c provided on the inner circumferential surface of the cylindrical portion 11f. A seal member 25d and a seal member 25e are provided between the inner circumferential surface of the cylindrical portion 11f and the outer circumferential surface of the housing 21. The seal member 25d and the seal member 25e are, for example, O-rings. The seal member 25d is disposed in front of the bearing 24c, and the seal member 25e is disposed behind the bearing 24c. The seal member 25d prevents excavated soil from flowing from in front of the cutter head 11 into the bearing 24c.

[0080] In injection device 20C, the configurations of housing 21 and injection nozzle 22 are basically the same as those of injection device 20 described above. However, in injection device 20C, inlet 21b of housing 21 is provided on the rear surface of housing 21. The injection liquid sent from supply source S1 to inlet 21b moves forward and is then sent to annular groove 21a.

[0081] Injection device 20C further includes a movement mechanism 30. Movement mechanism 30 includes an annular flat plate portion 31 and a plurality of jacks 32, for example, two in FIG. 7. Movement mechanism 30 moves injection nozzle 22 in the front-rear direction, thereby moving injection port 22c in the front-rear direction.

[0082] The annular flat plate portion 31 has an annular shape and is disposed coaxially with the housing 21. The annular flat plate portion 31 is fitted to the rear end portion of the housing 21. The inner peripheral surface of the annular flat plate portion 31 is fitted to the outer peripheral surface of the housing 21. In other words, the annular flat plate portion 31 extends radially outward from the outer peripheral surface of the housing 21 at the rear end portion of the housing 21.

[0083] For example, two jacks 32 are arranged at a distance from each other in the circumferential direction of the housing 21. Each jack 32 is attached to a portion of the cutter spoke 11c facing the annular flat plate portion 31 and extends in the front-rear direction. The jacks 32 are, for example, hydraulic jacks. However, other types of jacks, actuators, etc. may be used instead of the jacks 32. The number of jacks 32 does not have to be two, but may be one, three, or more. An extendable drive rod 32a is provided at the rear end of the jack 32. The tip of the drive rod 32a is fixed to the front surface of the annular flat plate portion 31. Therefore, as the drive rod 32a extends and retracts, the annular flat plate portion 31 moves in the front-rear direction. When the annular flat plate portion 31 moves in the front-rear direction, the housing 21 and the injection nozzle 22 move in the front-rear direction together with the annular flat plate portion 31.

[0084] In the example of Figure 8, a circular flat plate portion 31 having a circular ring shape is used as the member to which the drive rod 32a of the jack 32 is fixed, but the shape of the member to which the drive rod 32a of the jack 32 is fixed is not limited to the example of Figure 8 and may be, for example, a rectangular flat plate shape or the like.

[0085] FIG. 8 is a cross-sectional schematic diagram showing a state in which injection nozzle 22 of injection device 20C according to a third modified example of the present invention has moved forward from the state shown in FIG. 8. The state shown in FIG. 8 corresponds to a state in which drive rod 32a of jack 32 has contracted from the state shown in FIG. 7 and annular flat plate 31 has moved forward. When annular flat plate 31 moves forward, housing 21 and injection nozzle 22 move forward integrally with annular flat plate 31. As a result, the front-to-rear position of injection port 22c moves forward compared to the state shown in FIG. 7. On the other hand, the front-to-rear position of injection port 22c can also be moved rearward by extending drive rod 32a of jack 32 and moving annular flat plate 31 rearward.

[0086] As described above, the injection device 20C according to the third modification includes a movement mechanism 30 that moves the injection port 22c in the forward and backward directions. This allows the location of the excavated soil to be changed over a wider range, more effectively preventing the injection of the injection liquid only into specific locations of the excavated soil. This more appropriately allows the injection liquid to penetrate sufficiently into excavated soil that is highly viscous and prone to sticking. This allows the injection liquid to be more effectively injected into the excavated soil.

[0087] Specifically, as described above, movement mechanism 30 moves injection nozzle 22 in the front-rear direction, thereby moving injection nozzle 22 in the front-rear direction. This allows injection nozzle 22 to be moved in the front-rear direction without complicating the structure of injection nozzle 22.

[0088] In the above example, movement mechanism 30 moves injection nozzle 22 in the front-rear direction, thereby moving ejection port 22c in the front-rear direction. However, movement mechanism 30 is not limited to the above example. For example, a portion of injection nozzle 22 including ejection port 22c may be movable in the front-rear direction relative to other portions, and movement mechanism 30 may move the portion of injection nozzle 22 including ejection port 22c in the front-rear direction relative to other portions, thereby moving ejection port 22c in the front-rear direction.

[0089] FIG. 9 is a cross-sectional schematic view showing an injection device 20D according to a fourth modification of the present invention.

[0090] As shown in FIG. 9 , injection device 20D corresponds to an example in which a movement mechanism 30 that moves injection nozzle 22 in the front-to-rear direction is added to the above-described injection device 20. The movement mechanism 30 of injection device 20D differs from the movement mechanism 30 of injection device 20C in that an annular flat plate portion 31 is attached to motor 23. Therefore, the movement mechanism 30 of injection device 20D can move motor 23 and injection nozzle 22 in the front-to-rear direction by extending and retracting jack 32. Regarding the components of injection device 20D other than the movement mechanism 30, the positional relationships between some components and the shapes of some components differ from those of the above-described injection device 20. For example, annular groove 21a of injection device 20D is longer in the front-to-rear direction than annular groove 21a of injection device 20.

[0091] As described above, the injection device 20D of the fourth modification, like the injection device 20C of the third modification, is equipped with a movement mechanism 30 that moves the injection nozzle 22c in the forward and backward directions. This allows the location of the excavated soil to be changed over a wider range, more effectively preventing the injection of the injection liquid only into specific locations of the excavated soil. Therefore, for example, the injection liquid can be more appropriately allowed to penetrate sufficiently into excavated soil that is highly viscous and prone to sticking. This allows the injection liquid to be more effectively injected into the excavated soil.

[0092] FIG. 10 is a cross-sectional schematic diagram showing a state in which injection nozzle 22 of injection device 20D according to a fourth modified example of the present invention has moved rearward from the state shown in FIG. 10. The state shown in FIG. 10 corresponds to a state in which drive rod 32a of jack 32 is extended from the state shown in FIG. 9, causing annular plate portion 31 to move rearward. When annular plate portion 31 moves rearward, motor 23 and injection nozzle 22 move rearward together with annular plate portion 31. Here, as shown in FIG. 10, in injection device 20D, by moving injection nozzle 22 rearward, injection nozzle 22 can be retracted to a position where the tip of injection nozzle 22 is positioned rearward of front surface F1 of cutter head 11. As a result, injection port 22c can be blocked by the inner circumferential surface of housing 21, as shown in FIG. 10, thereby preventing soil from flowing into injection nozzle 22. In this way, when injection liquid is not being sprayed, the moving mechanism 30 moves the injection nozzle 22 back and forth, thereby closing the injection port 22c with the surrounding members (in the above example, the housing 21), and preventing soil and sand from flowing into the injection nozzle 22.

[0093] 10, for example, the rear portion of annular groove 21a can be shortened so that annular groove 21a and inlet 22b do not overlap when injection nozzle 22 is retracted, thereby blocking the flow path, which more reliably separates the flow path and more reliably prevents soil and sand from flowing into annular groove 21a.

[0094] 10, a gate may be added to shield the tip of injection nozzle 22 from the space in front of front face F1 of cutter head 11 (for example, a gate whose front-to-rear position is approximately aligned with front face F1 and which can open and close the space on the inner circumferential side of housing 21). In this case, closing the gate allows maintenance of injection nozzle 22. Also, in a mode in which injection nozzle 22c cannot be blocked simply by moving injection nozzle 22 rearward, such as in injection device 20C described above, the above gate may be added. This prevents soil from flowing into injection nozzle 22, allowing maintenance of injection nozzle 22.

[0095] The above describes a preferred embodiment of the present invention with reference to the accompanying drawings. However, it goes without saying that the present invention is not limited to the above-described embodiment, and various modified or altered examples within the scope of the claims also fall within the technical scope of the present invention.

[0096] For example, although an earth pressure type (including mud pressure type) tunnel boring machine 1 has been described above, the tunnel boring machine according to the present invention may also be a mud water type.

[0097] Furthermore, for example, when a hollow shaft motor or the like is used as the rotation mechanism, it becomes possible to position the inlet 22b of the injection nozzle 22 and the inlet 21b of the housing 21 on the central axis C1 of the injection nozzle 22, making it possible to form a linear flow path without passing through the annular groove 21a.

[0098] Furthermore, for example, although the components of the tunnel boring machine 1 have been described above with reference to the drawings, the dimensions and positional relationships of the components in the drawings are merely examples, and the dimensions and positional relationships of the components of the tunnel boring machine 1 are not limited to the examples shown in the drawings. Furthermore, components may be added, deleted, or modified as appropriate for the tunnel boring machine 1 illustrated in the drawings. [Explanation of symbols]

[0099] 1. Tunnel boring machine 2. Face 10 Excavator body 11 Cutter Head 11c Cuta Spoke 12 Cutter central axis 13 Bulkhead 14 Rotating Ring 15 Connecting beam 16 Cutter rotation motor 17 Chamber 18 Screw conveyor 19 Shield Jack 20 Injection device 20A injection device 20B Injection device 20C injection device 20D injection device 21 Housing 21a Annular groove 21b Inlet 22 injection nozzle 22a Injectate flow path 22a1 Small diameter section 22a2 Large diameter part 22b Inlet 22c injection port 22d main body 22d1 tapered section 22e Lid 22e1 Protrusion 22f Sealing material 22g valve body 22g1 recess 22h sealing material 22i Urging member 23 Motor (rotating mechanism) 23a Output shaft 24a bearing 24b Bearing 24c bearing 25a Sealing material 25b sealing member 25c sealing material 25d Sealing material 25e Sealing material 30 Moving mechanism 31 Annular plate section 32 Jack 32a Drive rod C1 center axis D1 Injection direction F1 front M1 Opening and closing member S segment S1 source

Claims

1. A cylindrical excavator body, a cutter head rotatably mounted on the front end of the excavator body; a partition wall disposed rearward of the cutter head; An injection device of a tunnel boring machine comprising: an injection nozzle that protrudes from the surface of the cutter head or the partition wall in the front-rear direction of the excavator body and injects an injection liquid containing at least one of water, a mud-adding agent, or an aerating agent into the excavated soil; an injection port provided in a portion of the injection nozzle protruding from the surface, the injection port injecting the injection liquid in an injection direction intersecting the front-rear direction; a rotation mechanism that rotates the injection nozzle around a central axis of the injection nozzle; Equipped with Injection device.

2. The ejection direction is a direction perpendicular to the front-rear direction. The injection device of claim 1 .

3. The jetting direction is a direction inclined forward with respect to a direction perpendicular to the front-rear direction. The injection device of claim 1 .

4. the injection nozzle has an injection liquid flow path extending along the central axis and through which the injection liquid flows; The injection port communicates the outer circumferential surface of the injection nozzle with the injection liquid flow path. The injection device of claim 1 .

5. The injection liquid flow path is connected to a supply source of the injection liquid on the opposite side of the surface from the injection port.

5. The injection device of claim 4.

6. an opening / closing member that closes the injection port when the injection liquid is not being injected and opens the injection port when the injection liquid is being injected; 5. The injection device of claim 4.

7. the injection liquid flow path extends beyond the injection port to a tip side of the injection nozzle, the opening / closing member is disposed inside the injection liquid flow path and includes a valve body that closes or opens the injection port, and a biasing member that biases the valve body toward the rear end of the injection nozzle, When the injection liquid is not being injected, the injection port is closed by the valve body, When the injection liquid is being injected, the valve body is pushed toward the tip side by the injection liquid, and the injection port is opened.

7. The injection device of claim 6.

8. a movement mechanism that moves the injection port in the front-rear direction; The injection device of claim 1 .

9. the movement mechanism moves the injection nozzle in the front-rear direction, thereby moving the injection port in the front-rear direction.

9. The injection device of claim 8.

10. the movement mechanism moves the injection nozzle in the forward and backward directions when the injection liquid is not being injected, thereby closing the injection port with a surrounding member.

10. The injection device of claim 9.

11. Equipped with an injection device according to any one of claims 1 to 10. Tunnel boring machine.

Images