Tunnel boring machine

Abstract

This prevents soil and sand from adhering to the panel surface. [Solution] The shield tunneling machine 100, which excavates underground to construct a tunnel T, comprises a skin plate 11 extending along the axial direction of the tunnel T, and a cutter head 20 provided in front of the skin plate 11 and driven to rotate. The cutter head 20 has a face plate portion 20a that rotates about a rotation axis, a plurality of first openings 24 that penetrate the face plate portion 20a and extend radially from the center of the face plate portion 20a, and a plurality of cutter bits 21 provided on the front surface 20b of the face plate portion 20a facing the tunnel face. The cutter head 20 is provided with first and second fluid ejection portions 60 and 70 that eject a fluid along the surface of the face plate portion 20a to suppress the adhesion of excavated soil to the surface of the face plate portion 20a.

Description

Technical Field

[0001] The present invention relates to a tunnel excavator. Background Art

[0002] Patent Document 1 discloses a shield excavator having a cutter face (face plate) provided with a plurality of cutter bits. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Publication No. 2022-118274 Summary of Invention Problems to be Solved by the Invention

[0004] In a shield excavator as disclosed in Patent Document 1, for example, when excavating viscous ground, sediment may adhere to the face plate. If sediment adheres to the vicinity of the cutter bits on the face plate or the openings through which excavated sediment passes, the excavation speed will decrease, which may lead to reduced work efficiency.

[0005] The present invention aims to suppress the adhesion of sediment to the face plate portion. Means for Solving the Problems

[0006] The present invention is a tunnel excavator that excavates underground to construct a tunnel, comprising a body extending along the axial direction of the tunnel, and a cutter head that is provided in front of the body and driven to rotate. The cutter head has a face plate portion that rotates around a rotation axis, a plurality of communication portions that penetrate through the face plate portion and extend radially from the center of the face plate portion, and a plurality of cutter bits provided on the front surface of the face plate portion facing the working face. The cutter head is provided with a fluid ejection portion that ejects a fluid for suppressing the adhesion of excavated sediment to the surface of the face plate portion along the surface of the face plate portion. Effects of the Invention

[0007] According to the present invention, since the cutter head is provided with a fluid ejection section that ejects fluid along the surface of the faceplate, it is possible to suppress the adhesion of excavated soil and sand to the surface of the faceplate. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating the configuration of a shield tunneling machine according to an embodiment of the present invention. [Figure 2] This is a front view of the cutter head of a shield tunneling machine according to an embodiment of the present invention. [Figure 3] (A) A radial cross-sectional view of the cutter head of the first fluid ejection section in a shield tunneling machine according to an embodiment of the present invention. (B) A cross-sectional view along the line IIIA-IIIA. [Figure 4] (A) A cross-sectional view in the radial direction of the cutter head of the second fluid ejection section in a shield tunneling machine according to an embodiment of the present invention. (B) A cross-sectional view along the IVA-IVA line. [Figure 5] (A) A radial cross-sectional view of the cutter head of the first fluid ejection section according to a modified example. (B) A cross-sectional view along the VA-VA line. [Figure 6] (A) A radial cross-sectional view of the cutter head of the first fluid ejection section according to a modified example. (B) A cross-sectional view along the VIA-VIA line. [Modes for carrying out the invention]

[0009] Hereinafter, with reference to the drawings, a tunnel boring machine according to an embodiment of the present invention will be described. In the following, the case in which the tunnel boring machine is a shield tunneling machine 100 used in the shield tunneling method will be described. The shield tunneling machine 100 excavates underground (natural ground) to form an excavation pit 1, and constructs a tunnel T by assembling a segment ring 10 (lining) to cover the inner wall of the excavation pit 1.

[0010] In the following, the direction in which the shield tunneling machine 100 moves, the tunnel face side, will be referred to as "forward," and the opposite direction, the tunnel entrance side, will be referred to as "rear." Furthermore, the radial direction of the tunnel T will simply be referred to as the "radial direction," and the axial direction of the tunnel T will simply be referred to as the "axial direction."

[0011] The shield tunneling machine 100 of this embodiment is a slurry-type shield tunneling machine used in the slurry-type shield tunneling method. As shown in Figure 1, the shield tunneling machine 100 comprises a cylindrical skin plate 11 (body) that extends along the axial direction of the tunnel T and is capable of supporting the inner wall of the excavation shaft 1, a cutter head 20 provided in front of the skin plate 11 and driven to rotate, a partition wall 13 provided inside the skin plate 11 and positioned opposite the cutter head 20 in the axial direction of the tunnel T, a cutter chamber 14 into which soil excavated by the cutter head 20 flows, and a slurry supply and discharge section 30 for supplying and discharging slurry into and out of the cutter chamber 14. Inside the rear side of the skin plate 11, segment rings 10 are sequentially constructed as the shield tunneling machine 100 moves forward.

[0012] The body of the jack 12 is fixed to the skin plate 11. The jack 12 receives a reaction force from the segment ring 10 and propels the skin plate 11 forward, pressing the cutter head 20 against the ground. When the skin plate 11 is propelled and the segment ring 10 emerges from the skin plate 11, backfill material (not shown) is filled between the outer surface of the segment ring 10 and the inner wall of the excavation hole 1.

[0013] The cutter head 20 is a so-called faceplate type cutter head. When the cutter head 20 rotates while pressed against the ground, the ground is excavated by the cutter bit 21 to form a borehole 1. The outer diameter of the cutter head 20 is approximately equal to the outer diameter of the skin plate 11, and the ground is excavated with an inner diameter approximately equal to the outer diameter of the skin plate 11.

[0014] As shown in Fig. 2, the cutter head 20 has a disc-shaped face plate portion 20a that rotates around a rotation axis (not shown), a plurality of cutter bits 21 provided on the front face 20b of the face plate portion 20a facing the working face, a plurality of first opening portions 24 (communication portions), and a plurality of second opening portions 25 (communication portions). Further, the face plate portion 20a has a plurality of first spoke portions 22 extending radially outward from the center, and fan-shaped flat plate portions 23 each provided between circumferentially adjacent first spoke portions 22.

[0015] The first opening portions 24 are provided between the first spoke portions 22 and the flat plate portions 23, and are formed to penetrate through the cutter head 20. The first opening portions 24 are formed to extend radially along both sides of each of the first spoke portions 22.

[0016] The second opening portions 25 are provided in the radially outer region of the flat plate portions 23, and are formed to penetrate through the cutter head 20. The second opening portions 25 are formed to extend radially near the circumferential center of the flat plate portions 23. A pair of the second opening portions 25 is provided on each flat plate portion 23, and a second spoke portion 26 extending in the radial direction is provided between the pair of second opening portions 25.

[0017] The cutter bits 21 are arranged in a line in the radial direction on both sides of the first spoke portions 22 so as to face the first opening portions 24, and are also arranged in a line in the radial direction on both sides of the second spoke portions 26 so as to face the second opening portions 25. Furthermore, the cutter bits 21 are arranged in a line in the radial direction in the vicinity of the first opening portions 24 and the second opening portions 25 of the flat plate portions 23.

[0018] The earth and sand excavated by the cutter bits 21 are guided to the rear of the cutter head 20 through the first opening portions 24 and the second opening portions 25, and stay in the cutter chamber 14 (see Fig. 1).

[0019] As shown in Figure 1, the cutter chamber 14 is defined by the skin plate 11, the cutter head 20, and the partition wall 13. Slurry is supplied into the cutter chamber 14 from a slurry supply and discharge unit 30. By filling the cutter chamber 14 with slurry and causing the pressure of the slurry in the cutter chamber 14 to act on the cutter head 20, the earth pressure and groundwater pressure acting on the tunnel face 2 can be restrained by the cutter head 20, so that the tunnel face 2 can be stabilized.

[0020] The partition wall 13 is arranged to face the cutter head 20 in the axial direction of the tunnel T, and a rotary drum 52 is rotatably supported on the partition wall 13. The cutter head 20 is connected to the rotary drum 52 via a connecting rod 53, and rotates together with the rotary drum 52. The rotary drum 52 is connected to an electric motor 51 via a reduction mechanism (not shown), and the rotary drum 52 and the cutter head 20 rotate relative to the skin plate 11 by the driving of the electric motor 51. By controlling the operation of the electric motor 51, the rotation direction and rotation speed of the cutter head 20 can be controlled.

[0021] As shown in Figure 1, the slurry supply and discharge unit 30 includes a storage unit 31 provided on the ground for storing slurry, a supply line 40 for supplying slurry from the storage unit 31 to the cutter chamber 14, and a discharge line 45 for discharging slurry from the cutter chamber 14 to the storage unit 31.

[0022] The storage unit 31 includes a sediment separation unit 32 that separates sediment from the slurry discharged from the cutter chamber 14, and an adjustment unit 33 that adds a conditioner to the slurry supplied from the sediment separation unit 32 to adjust the properties of the slurry and store the slurry.

[0023] The sediment separation section 32 is composed of, for example, a cyclone or a vibrating screen, and separates the sediment and mud (clay water) based on their different specific gravities. The separated mud is supplied to the adjustment section 33. The mud containing a large amount of excavated soil particles discharged from the discharge line 45 has the excavated soil particles separated and removed by the sediment separation section 32, and mud with fewer excavated soil particles is supplied by the supply line 40. In other words, the sediment separation section 32 adjusts the specific gravity of the mud. Although detailed explanations and illustrations are omitted, the sediment separation section 32 is also equipped with a filter press (not shown) that compresses the excess mud generated by the adjustment of the mud to produce a dewatered cake (secondary treated soil).

[0024] In the adjustment section 33, clean water is supplied to the mud stored in the adjustment tank 34 (storage tank) by the clean water supply section 35a, or an adjusting agent is added by the adjusting agent supply section 35b. This adjusts the specific gravity or viscosity (viscosity) of the mud. Although detailed illustrations are omitted, the adjusting agent supply section 35b includes, for example, an addition section that adds the adjusting agent to the mud in the adjustment tank 34, and a supply section that is a supply source such as a pump that supplies the adjusting agent to the addition section. The adjusting agent is an additive that adjusts viscosity, such as bentonite, a polymer surfactant, or a polymer flocculant. This adjusts the mud supplied to the cutter chamber 14 to the desired properties.

[0025] The supply line 40 includes a mud supply pipe 41 that connects the storage section 31 and the cutter chamber 14 and supplies mud water into the cutter chamber 14, and a mud supply pump 42 that sucks mud water from the storage section 31 and discharges it toward the cutter chamber 14.

[0026] The sludge pipe 41 is attached to the bulkhead 13 and connected to the inside of the cutter chamber 14. The sludge pipe 41 is installed such that it opens into the cutter chamber 14, for example, above the center of the cutter chamber 14 in the vertical direction. The sludge pipe 41 is provided with one or more sludge pumps 42 along its entire length to provide the desired supply capacity.

[0027] The discharge line 45 includes a sludge discharge pipe 46 that connects the cutter chamber 14 and the storage section 31 and discharges the muddy water from the cutter chamber 14, and a sludge discharge pump 47 that sucks the muddy water from the cutter chamber 14 and discharges it toward the storage section 31.

[0028] The sludge discharge pipe 46 is attached to the bulkhead 13 and connected to the inside of the cutter chamber 14. The sludge discharge pipe 46 is installed such that it opens into the cutter chamber 14, for example, below the center of the cutter chamber 14 in the vertical direction. The sludge discharge pipe 46 is provided with one or more sludge discharge pumps 47 along its entire length to achieve the desired discharge capacity. Note that only a single sludge supply pump 42 and sludge discharge pump 47 are shown in the drawings.

[0029] In the shield tunneling machine 100 configured in this way, drilling fluid prepared at an above-ground plant is sent into the cutter chamber 14 from the mud supply pipe 41, and excavation is carried out while stabilizing the face (excavation surface) by counteracting the soil and water pressure of the ground. The soil and sand excavated by the cutter head 20 are transported to the surface along with the drilling fluid through the mud discharge pipe 46.

[0030] Incidentally, in the shield tunneling machine 100, for example, when excavating cohesive soil, soil and sand may adhere to the surface of the cutter head 20. If soil and sand adhere to the vicinity of the cutter bit 21 and to the first opening 24 and second opening 25 through which the excavated soil and sand pass, and accumulate, there is a risk that the ground may not be excavated or the excavated soil and sand may not be discharged. If such problems occur, the excavation speed may decrease, which may reduce work efficiency.

[0031] Therefore, in the shield tunneling machine 100 of this embodiment, in order to suppress the adhesion of excavated soil to the surface of the cutter head 20, a first fluid ejection section 60 and a second fluid ejection section 70 are provided that eject fluid along the surface of the cutter head 20. The specific configurations of the first fluid ejection section 60 and the second fluid ejection section 70 will be described below.

[0032] First, the first fluid ejection section 60 will be described with reference to Figure 3. Figure 3(A) is a radial cross-sectional view of the cutter head 20 of the first fluid ejection section 60. Figure 3(B) is a cross-sectional view along the line IIIA-IIIA in Figure 3(A).

[0033] As shown in Figure 3, the first fluid ejection section 60 is provided between radially adjacent cutter bits 21 located on the faceplate section 20a (first spoke section 22, flat plate section 23, and second spoke section 26). The first fluid ejection section 60 includes a flow path forming member 61 (protruding portion) attached to the front surface 20b of the faceplate section 20a so as to protrude from the front surface 20b, an ejection hole 62 formed in the flow path forming member 61 that ejects fluid along the front surface 20b of the faceplate section 20a, and a communication passage 63 formed in the flow path forming member 61 that connects the supply flow path 27 formed in the faceplate section 20a with the ejection hole 62. In this embodiment, a foaming agent will be used as an example of the fluid ejected from the first fluid ejection section 60 and the second fluid ejection section 70. In addition, dispersants, penetrating agents, surfactants, and the like can be used as the fluids ejected from the first fluid ejection section 60 and the second fluid ejection section 70.

[0034] The flow path forming member 61 is formed, for example, from a metal, substantially disc-shaped member. The flow path forming member 61 is fixed to the faceplate portion 20a by bolts (not shown) or the like.

[0035] Multiple ejection holes 62 are formed so as to open on the outer circumferential surface of the flow channel forming member 61 at predetermined angular intervals (in this embodiment, four holes at 90-degree intervals). The multiple ejection holes 62 communicate with the communication passage 63 at the center of the flow channel forming member 61.

[0036] The connecting passage 63 is connected to the foaming agent supply unit 90 via a supply channel 27 and a supply pipe 91 formed in the face plate portion 20a (see also Figure 1). As a result, the foaming agent supplied from the foaming agent supply unit 90 to the ejection hole 62 through the supply pipe 91, supply channel 27 and connecting passage 63 is injected along the front surface 20b of the face plate portion 20a. Note that the method for manufacturing the foaming agent in a shield tunneling machine is quite common, so a detailed explanation is omitted here.

[0037] Next, the second fluid ejection section 70 will be described with reference to Figure 4. Figure 4(A) is a radial cross-sectional view of the cutter head 20 of the second fluid ejection section 70. Figure 4(B) is a cross-sectional view along the IVA-IVA line in Figure 4(A).

[0038] As shown in Figure 4, the second fluid ejection section 70 is provided on the side surface 20c of the faceplate section 20a (first spoke section 22, flat plate section 23, and second spoke section 26) that demarcates the first opening 24 and the second opening 25. The second fluid ejection section 70 has a flow path forming member 71 attached to the side surface 20c of the faceplate section 20a, an ejection hole 72 formed in the flow path forming member 71 that ejects fluid (foaming agent) along the side surface 20c (surface) of the faceplate section 20a, and a communication passage 73 formed in the flow path forming member 71 that connects the supply flow path 28 formed in the faceplate section 20a with the ejection hole 72. The flow path forming member 71 of the second fluid ejection section 70 has the same shape as the flow path forming member 61 of the first fluid ejection section 60. The size, shape, or number of ejection holes of the flow path forming member 71 of the second fluid ejection section 70 may differ from those of the flow path forming member 61.

[0039] The connecting passage 73 is connected to the foaming agent supply unit 90 via a supply channel 28 and a supply pipe 91 formed in the faceplate portion 20a. As a result, the foaming agent supplied from the foaming agent supply unit 90 to the ejection hole 72 through the supply pipe 91, supply channel 28 and connecting passage 73 is sprayed along the side surface 20c of the faceplate portion 20a.

[0040] Next, the operation of the first fluid ejection section 60 and the second fluid ejection section 70 will be explained.

[0041] In the shield tunneling machine 100, the foaming agent supply unit 90 is activated when the cutter head 20 is rotated to excavate the ground. When the foaming agent supply unit 90 is activated, foaming agent is supplied from the foaming agent supply unit 90 to the ejection hole 62 through the supply pipe 91, the supply channel 27, and the connecting passage 63, and is ejected from the ejection hole 62 along the front surface 20b of the face plate 20a. In addition, foaming agent is supplied from the foaming agent supply unit 90 to the ejection hole 72 through the supply pipe 91, the supply channel 28, and the connecting passage 73, and is ejected from the ejection hole 72 along the side surface 20c of the face plate 20a.

[0042] Thus, in the shield tunneling machine 100 of this embodiment, the foaming agent is ejected along the surface (front 20b, side 20c) of the face plate portion 20a, thereby forming an interface between the surface (front 20b, side 20c) of the face plate portion 20a and the excavated soil. This suppresses the adhesion of excavated soil to the surface (front 20b, side 20c) of the face plate portion 20a.

[0043] For example, the space between radially adjacent cutter bits 21 is narrow, making it easy for excavated soil and sand to adhere and accumulate. For this reason, it is preferable to provide at least the first fluid ejection section 60 between radially adjacent cutter bits 21. However, if there is a place on the front surface 20b of the cutter head 20 where soil and sand are likely to adhere, the first fluid ejection section 60 may be provided even if it is not between radially adjacent cutter bits 21.

[0044] Furthermore, excavated soil and sand tend to adhere to and accumulate near the radial ends of the first opening 24 and the second opening 25. For this reason, it is preferable that the second fluid ejection section 70 be provided at least on the side surfaces 20c near the radial ends of the first opening 24 and the second opening 25. In addition, if there are other places on the side surfaces 20c of the cutter head 20 where soil and sand tend to adhere, the second fluid ejection section 70 may also be provided.

[0045] Furthermore, check valves may be provided at the ejection holes 62 of the first fluid ejection section 60 and the ejection holes 72 of the second fluid ejection section 70 in the above embodiment to allow the ejection of the foaming agent and prevent soil and sand from flowing into the ejection holes 62 and 72. This prevents soil and sand from entering the ejection holes 62 and 72 and causing clogging. Additionally, filters may be provided at the ejection holes 62 of the first fluid ejection section 60 and the ejection holes 72 of the second fluid ejection section 70 to prevent soil and sand from flowing into the ejection holes 62 and 72.

[0046] In the above embodiment, four ejection holes 62 and 72 were provided at 90-degree intervals, but this is not limited to this configuration. The number and position of the ejection holes 62 and 72 can be selected as appropriate.

[0047] The shield tunneling machine 100 configured as described above will produce the following effects.

[0048] In the shield tunneling machine 100, the first fluid ejection section 60 and the second fluid ejection section 70 eject a foaming agent along the surface (front 20b, side 20c) of the face plate section 20a. As a result, the fluid (foaming agent) can form an interface between the surface (front 20b, side 20c) of the face plate section 20a and the excavated soil, thereby suppressing the adhesion of the excavated soil to the surface (front 20b, side 20c) of the face plate section 20a.

[0049] Furthermore, in the shield tunneling machine 100, the foaming agent (fluid) is ejected along the surface (front 20b, side 20c) of the face plate 20a. This allows for wider distribution of the foaming agent compared to, for example, the case where the foaming agent is ejected perpendicularly to the surface of the face plate 20a. As a result, each of the first fluid ejection section 60 and the second fluid ejection section 70 can form an interface over a wider area of ​​the surface of the face plate 20a, thereby suppressing the adhesion of excavated soil over a wider area.

[0050] Next, with reference to Figure 5, a modified example of the first fluid ejection section 60, the first fluid ejection section 160, will be described.

[0051] As shown in Figure 5, the first fluid ejection section 160 is provided near the base of the cutter bit 21 which is located on the faceplate section 20a (first spoke section 22, flat plate section 23, and second spoke section 26). The first fluid ejection section 160 has an ejection hole 162 which opens near the base of the cutter bit 21 and ejects fluid (foaming agent) along the front surface 20b (surface) of the faceplate section 20a, and a communication passage 163 which is formed in the cutter bit 21 and connects the supply passage 29 formed in the faceplate section 20a with the ejection hole 162.

[0052] The ejection holes 162 are arranged so that the ejection holes 162 on adjacent cutter bits 21 face each other.

[0053] The connecting passage 163 is connected to the foaming agent supply unit 90 via a supply channel 29 and a supply pipe 91 formed in the faceplate portion 20a. As a result, the foaming agent supplied from the foaming agent supply unit 90 to the ejection hole 162 through the supply pipe 91, supply channel 29 and connecting passage 163 is sprayed along the front surface 20b of the faceplate portion 20a.

[0054] In this way, the first fluid ejection section 160 can also form an interface between the front surface 20b of the faceplate section 20a and the excavated soil using a foaming agent. This prevents the excavated soil from adhering to the front surface 20b of the faceplate section 20a.

[0055] Next, with reference to Figure 6, a further modification of the first fluid ejection section 60, the first fluid ejection section 260, will be described.

[0056] As shown in Figure 6, the first fluid ejection section 260 is provided between radially adjacent cutter bits 21 located on the faceplate section 20a (first spoke section 22, flat plate section 23, and second spoke section 26). The first fluid ejection section 260 is provided between radially adjacent cutter bits 21 and has a plate-shaped porous body 261 from which a fluid (foaming agent) that suppresses the adhesion of excavated soil to the front surface 20b of the faceplate section 20a leaks.

[0057] The porous body 261 is made of, for example, porous ceramic, and is attached to the front surface 20b of the faceplate portion 20a by fixing a retaining member (not shown) that holds the porous ceramic to the faceplate portion 20a with bolts or the like.

[0058] The porous body 261 is supplied with foaming agent from the foaming agent supply unit 90 through the supply pipe 91 and the supply channel 127 formed in the faceplate 20a. As a result, the foaming agent leaks out from the surface of the porous body 261. More specifically, the foaming agent seeps out from the numerous pores exposed on the surface of the porous body 261, forming an interface between the entire surface of the porous body 261 and the excavated soil.

[0059] In this way, the first fluid ejection section 260 can also form an interface between the porous body 261 attached to the front surface 20b of the faceplate section 20a and the excavated soil using the fluid (foaming agent), thereby suppressing the adhesion of excavated soil to the front surface 20b of the faceplate section 20a.

[0060] Furthermore, in the first fluid ejection section 260, since the foaming agent leaks out from the entire porous body 261, the interface between the front surface 20b of the faceplate section 20a and the excavated soil can be formed more reliably over a wider area.

[0061] In the above embodiment, the case in which the shield tunneling machine 100 is equipped with a first fluid ejection section 60 and a second fluid ejection section 70 was described as an example, but if not necessary, only at least one of the first fluid ejection section 60 and the second fluid ejection section 70 may be provided.

[0062] Furthermore, the configuration relating to the first fluid ejection section 260 may be adopted for the second fluid ejection section 70. In addition, the first fluid ejection sections 60, 160, and 260 may be used in combination.

[0063] In the above embodiments and modifications, the first fluid ejection parts 60, 260 were described as being provided between radially adjacent cutter bits 21, but if necessary, they may be provided at any location on the front surface 20b of the faceplate portion 20a.

[0064] Furthermore, although the above embodiment was described using the example of a slurry-type shield tunneling machine 100 as the tunnel boring machine, the tunnel boring machine may also be a mud-type shield tunneling machine. In addition, other tunnel boring machines besides the shield tunneling machine 100 may also be used, for example, a tunnel boring machine installed at the tip of a jacking pipe in a tunnel jacking method.

[0065] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of Symbols]

[0066] 100 Shield tunneling machine (tunnel boring machine) 1. Borehole 2. Face 10-segment ring 11 Skin Plate (Torso) 13 Bulkhead 14 Cutter Chamber 20 Cutter heads 20a Face plate part 20b front 20c side 21 Cutter Bits 24 First opening (communication part) 25 Second opening (communication part) 60 First fluid ejection part 61 Flow channel forming member (protruding part) 62 Spout hole 70 Second fluid jetting part (fluid jetting part) 71 Flow channel forming member (protruding part) 72 Spout hole 127 Supply channel 160 First fluid jetting part (fluid jetting part) 162 Spout hole 260 First fluid ejection section (fluid ejection section) 261 Porous bodies T トンネル

Claims

1. A tunnel boring machine that excavates underground to construct a tunnel, A body extending along the axial direction of the aforementioned tunnel, The body comprises a cutter head provided at the front of the body and driven to rotate, The aforementioned cutter head is A panel that rotates around a rotation axis, Multiple connecting portions that penetrate the aforementioned panel portion and extend radially from the center of the panel portion, The panel portion has a plurality of cutter bits provided on the front surface facing the cutting face, The cutter head is provided with a fluid ejection unit that ejects a fluid along the surface of the faceplate to suppress the adhesion of excavated soil and sand to the surface of the faceplate, in a tunnel boring machine.

2. A tunnel boring machine according to claim 1, The aforementioned fluid ejection section is A protruding portion provided that protrudes from the surface of the panel portion, A tunnel boring machine having ejection holes provided on the protruding portion and along the surface of the faceplate portion for ejecting the fluid.

3. A tunnel boring machine according to claim 1, The fluid ejection section is provided on the side surface of the faceplate section that demarcates the communication section, and has ejection holes along the side surface for ejecting the fluid, in a tunnel boring machine.

4. A tunnel boring machine according to claim 1, The fluid ejection section is provided so as to face each other near the base of adjacent cutter bits and has ejection holes that eject the fluid along the front surface of the faceplate section, in a tunnel boring machine.

5. A tunnel boring machine according to claim 1, The tunnel boring machine has a fluid ejection section that allows the ejection of the fluid and has a check valve that suppresses the inflow of soil into the fluid ejection section.

6. A tunnel boring machine that excavates underground to construct a tunnel, A body extending along the axial direction of the aforementioned tunnel, The body comprises a cutter head provided at the front of the body and driven to rotate, The aforementioned cutter head is A panel that rotates around a rotation axis, Multiple connecting portions that penetrate the aforementioned panel portion and extend radially from the center of the panel portion, Multiple cutter bits are provided on the front surface of the faceplate portion facing the cutting face, A plate-shaped porous body that is attached to the surface of the panel portion and from which a fluid leaks out to prevent excavated soil and sand from adhering to the surface of the panel portion, A tunnel boring machine having a supply pipe for supplying the fluid to the porous body.

Images