Tunnel Boring Machine

Abstract

A tunnel boring machine (1) in one embodiment includes a cutting drum (5) and a door (7). An opening (5a) for entering the interior of the cutting drum (5) is provided on the inner wall portion (53) of the cutting drum (5). The door (7) is fixed to the inner wall portion (53) by a closing bolt (6) in a state of closing the opening (5a). The closing bolt (6) includes a head portion (61) and a shaft portion (62). A threaded tooth (63) is formed at the tip of the shaft portion (62) to be screwed into a threaded hole (78) provided in the door (7), and a small diameter portion (64) having a diameter smaller than the outer diameter of the threaded tooth (63) is provided on the shaft portion (62) on the side closer to the head portion (61) than the threaded tooth (63). The inner wall portion (53) is provided with a threaded hole (48) through which the small diameter portion (64) of the shaft portion (62) of the closing bolt (6) is inserted and can be screwed into the threaded tooth (63).

Description

Technical Field

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

[0002] In a tunnel boring machine, a cutting disc (cutter head) is rotatably supported by a tunnel boring machine body via an annular cutting drum (cutter drum). For example, Patent Document 1 discloses a tunnel boring machine configured so that a worker can enter the inside of the cutting drum.

[0003] Specifically, in the tunnel boring machine disclosed in Patent Document 1, the tunnel boring machine body includes an inner peripheral wall facing the inner wall portion of the cutting drum and an outer peripheral wall facing the outer wall portion of the cutting drum, and the inner peripheral wall of the tunnel boring machine body and the inner wall portion of the cutting drum are each provided with an opening. Therefore, an operator can enter the interior of the cutting drum from the inner side of the inner peripheral wall of the tunnel boring machine body through the openings.

[0004] In the tunnel boring machine disclosed in Patent Document 1, generally, an opening provided in the inner wall of the cutting drum is closed by a door. The door is fixed to the inner wall of the cutting drum by bolts.

[0005] Prior art literature:

[0006] Patent literature:

[0007] Patent document 1: Japanese Patent Application Publication No. 2018-141278. Summary of the invention

[0008] Problems to be solved by the invention:

[0009] However, in a structure where the door is fixed to the inner wall of the cutting drum by bolts, there is a concern that the bolts may fall between the inner wall of the cutting drum and the inner peripheral wall of the boring machine body when the bolts are removed. In this case, the fallen bolts may have an adverse effect on the rotary bearing for the cutting drum.

[0010] In addition, an opening for entering the interior of the cutting drum is sometimes provided on the outer wall of the cutting drum, but in this case, as described above, there is a concern that the bolts for fixing the door may fall between the outer wall of the cutting drum and the outer peripheral wall of the boring machine body.

[0011] Therefore, an object of the present invention is to provide a tunnel boring machine capable of preventing bolts for fixing a door leaf that closes an opening provided in a cutting drum from falling off.

[0012] Means of solving the problem:

[0013] In order to solve the above-mentioned problem, the tunnel boring machine of the present invention is characterized in that it comprises: an annular cutting drum rotating together with the cutting disk, which includes an inner wall portion and an outer wall portion, an opening for entering the interior of the cutting drum is provided on either the inner wall portion or the outer wall portion, and a door leaf fixed to the inner wall portion or the outer wall portion by a closing bolt in a state of closing the opening; the closing bolt includes a head and a shaft portion, a threaded tooth is formed on the tip end of the shaft portion for screwing into a threaded hole provided in the door leaf, a small diameter portion with a diameter smaller than the outer diameter of the threaded tooth is provided on the shaft portion on the side closer to the head than the threaded tooth, and a threaded hole is provided on the inner wall portion or the outer wall portion, which is penetrated by the small diameter portion of the shaft portion of the closing bolt and can be screwed into the threaded tooth.

[0014] According to the above structure, if the screwing state of the threaded teeth of the closing bolt and the threaded hole of the door is released, the opening provided in the inner wall portion or the outer wall portion of the cutting drum can be opened. At this time, the inner wall portion or the outer wall portion of the cutting drum is provided with a threaded hole through which the small diameter portion of the closing bolt is inserted and can be screwed with the threaded teeth of the closing bolt, so the threaded hole can play a role in preventing the closing bolt from falling off. Therefore, the closing bolt can be prevented from falling off.

[0015] Effect of the invention:

[0016] According to the present invention, it is possible to prevent the closing bolts for fixing the door for closing the opening provided in the cutting drum from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a tunnel boring machine according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A front view of a tunnel boring machine is shown;

[0019] Figure 3 is along Figure 1 The cross-sectional view of line III-III;

[0020] Figure 4 is along Figure 3 A cross-sectional view of the IV-IV line;

[0021] Figure 5 yes Figure 3 A magnified view of the main part;

[0022] Figure 6 is a diagram showing a portion of the cutting drum as viewed from the inside;

[0023] Figure 7 is along Figure 6 A cross-sectional view of the line VII-VII;

[0024] Figure 8 is along Figure 6 A cross-sectional view of the line VIII-VIII;

[0025] Fig. 9 is along Figure 6 A cross-sectional view of the line IX-IX;

[0026] Fig.10 is along Figure 6 X-ray cross-sectional view. DETAILED DESCRIPTION

[0027] Figure 1 and Figure 2 2 shows a tunnel boring machine 1 according to an embodiment of the present invention. For example, the tunnel boring machine 1 is a shield tunneling machine in which segments are assembled. However, the present invention can also be applied to tunnel boring machines other than shield tunneling machines.

[0028] Specifically, the tunnel boring machine 1 includes a cutting disk 3 that digs natural ground and a tunnel boring machine body 2 that rotatably supports the cutting disk 3 via a cutting drum 5. That is, the cutting drum 5 rotates together with the cutting disk 3.

[0029] In this embodiment, the cross-sectional shape of the tunnel boring machine 1 is circular. However, the cross-sectional shape of the tunnel boring machine 1 may be other shapes such as rectangular. For convenience of description, the traveling direction of the tunnel boring machine 1 is referred to as the front direction, and the opposite direction is referred to as the rear direction.

[0030] The boring machine body 2 includes a cylindrical body 21 and a partition wall 22 that closes a front opening of the body 21. The partition wall 22 faces the cutting disk 3, and a cutter chamber 10 is formed between the partition wall 22 and the cutting disk 3.

[0031] The cutting disc 3 includes a plurality of (12 in the example) radially arranged cutting spokes 31 . That is, each cutting spoke 31 extends in the radial direction of the cutting disc 3 (that is, on a line passing through the rotation center). Adjacent cutting spokes 31 are connected to each other by reinforcement members 32 .

[0032] Each cutting spoke 31 has a rectangular cross-sectional shape. A cutting bit 3 a , 3 b is attached to the front surface and the side surface of each cutting spoke 31 , respectively.

[0033] However, a roller cutter may be mounted on the cutting spoke 31 instead of the cutting bits 3a and 3b. Alternatively, both the cutting bit and the roller cutter may be mounted on the cutting spoke 31. The cutting disk 3 does not necessarily have to include the cutting spoke 31, and may be in the shape of a disk.

[0034] The cutting drum 5 is annular and arranged behind the cutting disc 3. Between the cutting disc 3 and the cutting drum 5, there are arranged the same number of connecting posts 33 as the number of cutting spokes 31. Each cutting spoke 31 is connected to the cutting drum 5 via the corresponding connecting post 33.

[0035] The cutting drum 5 is provided so that the partition wall 22 is divided into an annular outer partition wall 22a and a disc-shaped inner partition wall 22b. From the inner peripheral edge of the outer partition wall 22a, an outer peripheral wall 23 facing the outer peripheral surface of the cutting drum 5 (an outer wall portion 54 described later) is extended, and a plurality of earth and sand seals (not shown) are sealed therebetween. Similarly, from the outer peripheral edge of the inner partition wall 22b, an inner peripheral wall 24 facing the inner peripheral surface of the cutting drum 5 (an inner wall portion 53 described later) is extended, and a plurality of earth and sand seals (not shown) are sealed therebetween.

[0036] Furthermore, the center portion of the cutting disc 3 and the center portion of the inner partition wall 22b are connected via a rotary joint 34. The rotary joint 34 is hollow, and a pipe or the like can be disposed inside.

[0037] The cutting spokes 31, the connecting posts 33 and the cutting drum 5 are all hollow, so that the operator can work inside them. In this embodiment, the operator can enter the cutting spokes 31 from the inside of the inner peripheral wall 24 through the inside of the cutting drum 5 and the inside of the connecting posts 33.

[0038] More specifically, Figure 3 As shown, on the inner peripheral wall 24, longitudinally long openings 25 are provided from the rotation center of the cutting drum 5 to the left and right sides. Figure 5 As shown, each opening 25 and a part of the space inside the inner peripheral wall 24 are covered by a surrounding member 26 , and a door 27 is provided on the surrounding member 26 .

[0039] return Figure 3 The same number of working spaces 50 as the number of cutting spokes 31 are formed in the cutting drum 5. The working spaces 50 are formed at positions where the cutting spokes 31 and the cutting drum 5 intersect when viewed from the front-rear direction.

[0040] In the cutting drum 5, each working space 50 is divided by a pair of partition plates 56 in the circumferential direction of the cutting drum 5. The pair of partition plates 56 are parallel to each other. When a certain working space 50 is located directly to the side of the rotation center of the cutting drum 5, the partition plate 56 on the lower side facing the working space 50 functions as a workbench.

[0041] In more detail, Figure 4 As shown, the cutting drum 5 includes a front wall portion 51, a rear wall portion 52, an inner wall portion 53, and an outer wall portion 54. Each partition plate 56 is joined to the front wall portion 51, the rear wall portion 52, the inner wall portion 53, and the outer wall portion 54.

[0042] Furthermore, a plurality of reinforcing plates 55 are provided in the cutting drum 5 so as to be located between the working spaces 50. Each reinforcing plate 55 is also joined to the front wall portion 51, the rear wall portion 52, the inner wall portion 53, and the outer wall portion 54.

[0043] The inner wall portion 53 is provided with a plurality of openings 5a for entering the working space 50 at positions corresponding to the working space 50. The openings 5a in the front-rear direction are located near the rear of the inner wall portion 53 so as to coincide with the openings 25 provided in the inner peripheral wall 24.

[0044] In addition, the front wall portion 51 is provided with a plurality of openings 5b at positions corresponding to the working spaces 50. Each opening 5b allows the corresponding working space 50 to communicate with the interior of the connecting column 33.

[0045] See next Figure 6 to Figure 8 The door 7 and its surrounding structures for closing each opening 5a are described. Figure 3 to Figure 5 It is omitted in order to simplify the drawings.

[0046] In this embodiment, the opening 5a is closed in a state where the door 7 is fitted into the opening 5a. However, the structure of the door 7 is not limited to this, and can be changed appropriately.

[0047] More specifically, the inner wall portion 53 includes: Figure 6 In the vertical direction) separated by the opening 5a of a pair of transverse frames 41, 42; and in the axial direction of the cutting drum 5 ( Figure 6 A pair of longitudinal frames 43, 44 separated from each other via the opening 5a (in the left-right direction).

[0048] The door 7 includes a main plate 71 having a size substantially the same as that of the opening 5a, and a pair of transverse frames 73, 74 and a pair of longitudinal frames 75, 76 surrounding the main plate 71. The transverse frames 73, 74 abut against the transverse frames 41, 42 of the inner wall portion 53 from the back side (radially outward of the cutting drum 5), respectively, and the longitudinal frames 75, 76 abut against the longitudinal frames 43, 44 of the inner wall portion 53 from the back side (radially outward of the cutting drum 5), respectively.

[0049] Furthermore, the door leaf 7 includes a jacket 72 that overlaps with the main plate 71 and is fitted into the opening 5a. A circular hole 72a is provided at the center of the jacket 72, and the central portion of the main plate 71 is exposed through the circular hole 72a.

[0050] The door 7 is fixed to the inner wall portion 53 by a plurality of closing bolts 6 in a state of closing the opening 5a. Fig. 9 As shown, the horizontal frames 41 and 42 are each provided with two through holes 45 for inserting the closing bolts 6. However, the through holes 45 may also be provided in the vertical frames 43 and 44.

[0051] The closing bolt 6 includes a first head portion 61 and a first shaft portion 62. The first head portion 61 is provided with a hexagonal hole for rotating the closing bolt 6.

[0052] The horizontal frames 73 and 74 of the door leaf 7 are each provided with a threaded hole 78 at a position corresponding to the through hole 45. The first thread 63 that is screwed into the threaded hole 78 is formed at the tip end of the first shaft portion 62 of the closing bolt 6. In addition, the first shaft portion 62 is provided with a first small diameter portion 64 having a smaller diameter than the outer diameter of the first thread 63, closer to the first head portion 61 than the first thread 63.

[0053] Each through hole 45 includes a large diameter portion 46 having a larger diameter than the first head portion 61 of the closing bolt 6, and a small diameter portion 47 having a smaller diameter than the first head portion 61. The portion of the small diameter portion 47 adjacent to the large diameter portion 46 forms a threaded hole 48 that can be screwed with the first thread 63. The first small diameter portion 64 of the first shaft portion 62 is inserted through the threaded hole 48.

[0054] That is, when the closing bolt 6 is inserted into the through hole 45, the closing bolt 6 is rotated until the first thread 63 passes through the threaded hole 48 while the first thread 63 is threadedly engaged with the threaded hole 48. Thus, the threaded hole 48 is penetrated by the first small diameter portion 64 of the first shaft portion 62.

[0055] return Figure 6 to Figure 8 A sliding plate 9 slidable in the axial direction of the cutting drum 5 is arranged in the working space 50 . The door 7 is mounted on the sliding plate 9 .

[0056] The slide plate 9 includes a main plate 91 parallel to the main plate 71 of the door 7 and a cylindrical block 92 provided at the center of the main plate 91. Two rollers 93 are provided at each of the two ends of the main plate 91 in the circumferential direction of the cutting drum 5.

[0057] On the other hand, rails 11 extending in the axial direction of the cutting drum 5 are mounted on both partition plates 56 located on both sides of the working space 50 via support tables 12. The rollers 93 are engaged with the rails 11 and roll along the rails 11.

[0058] The main plate 71 of the door leaf 7 is provided with four rods 95 orthogonal to the main plate 71. The number of the rods 95 can be changed appropriately. Each rod 95 is held on the main plate 91 of the sliding disk 9 so as to slide along the axial direction of the rod 95. That is, the door leaf 7 is guided by the rods 95 and can move in a direction approaching the sliding disk 9 (toward the radially outward direction of the cutting drum 5) and in a direction away from the sliding disk 9 (toward the radially inward direction of the cutting drum 5).

[0059] The door leaf 7 is fixed to the slide plate 9 by the opening bolt 8 in a state where the opening 5a is opened. A ring 77 for holding the opening bolt 8 is provided at the center of the main plate 71 of the door leaf 7.

[0060] In more detail, Fig.10 As shown, the opening bolt 8 includes a second head 81 and a second shaft 82. In the present embodiment, the second head 81 has a hexagonal outline, but the second head 81 may have a circular outline and a hexagonal hole may be provided in the second head 81.

[0061] The block 92 of the sliding plate 9 is provided with a threaded hole 94 at a position corresponding to the center hole of the ring 77 of the door leaf 7. The tip end of the second shaft portion 82 of the opening bolt 8 is formed with a second thread 83 that is screwed into the threaded hole 94. In addition, the second shaft portion 82 is provided with a second small diameter portion 84 having a smaller diameter than the outer diameter of the second thread 83 on the side closer to the second head portion 81 than the second thread 83. In addition, the second shaft portion 82 is provided with a third thread 85 having the same outer diameter as the second thread 83 between the second head portion 81 and the second small diameter portion 84.

[0062] On the other hand, a portion of the ring 77 of the door 7 on the sliding plate 9 side is formed with a screw hole 79 that can be screwed with the second screw thread 83. The screw hole 79 is screwed with the third screw thread 85.

[0063] When opening the opening 5a, first, the closing bolt 6 is turned to release the screwing state between the first thread 63 and the screw hole 78 of the door 7. Next, the opening bolt 8 is turned to release the screwing state between the third thread 85 and the screw hole 79 of the door 7, so that the screw hole 79 is penetrated by the second small diameter portion 84 of the second shaft portion 82. After that, the door 7 is pressed into the working space 50, and the opening bolt 8 is turned to screw the second thread 83 into the screw hole 94 of the sliding plate 9, and the ring 77 of the door is brought into contact with the block 92 of the sliding plate 9.

[0064] As described above, in the tunnel boring machine 1 of the present embodiment, if the screwed state between the first thread 63 of the closing bolt 6 and the threaded hole 78 of the door leaf 7 is released, the opening 5a provided in the inner wall portion 53 of the cutting drum 5 can be opened. At this time, the threaded hole 48 through which the first small diameter portion 64 of the closing bolt 6 is inserted and which can be screwed with the first thread 63 of the closing bolt 6 is provided in the inner wall portion 53 of the cutting drum 5, so the threaded hole 48 (more precisely, the thread of the threaded hole 48) plays a function of preventing the closing bolt 6 from coming off. Therefore, the closing bolt 6 can be prevented from falling off.

[0065] In addition, in the present embodiment, the portion of the door leaf 7 through which the opening bolt 8 passes is also provided with a threaded hole 79, so the threaded hole 79 (more precisely, the thread of the threaded hole 79) plays a role in preventing the opening bolt 8 from falling off. Therefore, not only the closing bolt 6 but also the opening bolt 8 can be prevented from falling off.

[0066] (Variation)

[0067] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

[0068] For example, in contrast to the above-described embodiment, the operator may enter the interior of the cutting spoke 31 from the outside of the outer peripheral wall 23 through the interior of the cutting drum 5 and the interior of the connecting column 33. In this case, the opening 5a for entering the interior of the cutting drum 5 is provided in the outer wall portion 54 of the cutting drum 5, and the threaded hole 48 is provided in the outer wall portion 54. That is, the door 7 is fixed to the outer wall portion 54 by the closing bolt 6 in a state of closing the opening 5a.

[0069] Furthermore, the third thread 85 may not be formed on the second shaft portion 82 of the opening bolt 8, and the second small diameter portion 84 may extend from the second thread 83 to the second head portion 81. In this case, the second small diameter portion 84 is inserted through the threaded hole 79. However, if the third thread 85 is formed on the second shaft portion 82 as in the above embodiment, the opening bolt 8 can be fixed to the door leaf 7 by screwing the third thread 85 of the opening bolt 8 and the threaded hole 79 provided in the door leaf 7 in a state where the door leaf 7 closes the opening 5a.

[0070] In addition, the rod 95 may be omitted, and when opening the opening 5a, the operator lifts the door 7 to abut against the slide plate 9. However, if the rod 95 is provided on the door 7 as in the above embodiment, the opening 5a can be closed or opened by simply moving the door 7 in the axial direction of the rod 95.

[0071] Alternatively, the slide plate 9 may be omitted, and the door 7 may be swingably supported on the cutting drum 5 via a hinge.

[0072] (Summarize)

[0073] The tunnel boring machine of the present invention is characterized in that it comprises: an annular cutting drum rotating together with the cutting disk, which includes an inner wall portion and an outer wall portion, an opening for entering the interior of the cutting drum is provided on either the inner wall portion or the outer wall portion, and a door leaf fixed to the inner wall portion or the outer wall portion by a closing bolt in a state of closing the opening; the closing bolt includes a head portion and a shaft portion, a threaded tooth is formed on the tip end of the shaft portion and is screwed into a threaded hole provided in the door leaf, a small diameter portion with a diameter smaller than the outer diameter of the threaded tooth is provided on the shaft portion on the side closer to the head than the threaded tooth, and a threaded hole is provided on the inner wall portion or the outer wall portion, which is penetrated by the small diameter portion of the shaft portion of the closing bolt and can be screwed into the threaded tooth.

[0074] According to the above structure, if the screwing state between the threaded teeth of the closing bolt and the threaded hole of the door leaf is released, the opening provided in the inner wall portion or the outer wall portion of the cutting drum can be opened. At this time, the inner wall portion or the outer wall portion of the cutting drum is provided with a threaded hole through which the small diameter portion of the closing bolt is inserted and can be screwed with the threaded teeth of the closing bolt, so the threaded hole plays a function of preventing the closing bolt from falling off. Therefore, the closing bolt can be prevented from falling off.

[0075] Alternatively, the head, shaft, thread and small diameter portion of the closing bolt are respectively a first head, a first shaft, a first thread and a first small diameter portion, and the tunnel boring machine is further provided with a sliding plate arranged inside the cutting drum and capable of sliding along the axial direction of the cutting drum, and the door is fixed to the sliding plate by an opening bolt in a state where the opening is open, and the opening bolt includes a second head and a second shaft, and a second thread is formed on the tip end of the second shaft to be screwed with a threaded hole provided in the sliding plate, and a second small diameter portion having a diameter smaller than the outer diameter of the second thread is provided on the second shaft on the side closer to the second head than the second thread, and a threaded hole capable of being screwed with the second thread is provided on the door. According to this structure, the threaded hole provided in the door plays a role in preventing the opening bolt from coming off. Therefore, not only the closing bolt but also the opening bolt can be prevented from falling off.

[0076] Alternatively, the door leaf may be provided with a rod penetrating the sliding plate, and the rod may be held on the sliding plate so as to be slidable along the axial direction of the rod. According to this structure, the opening can be opened or closed only by moving the door leaf in the axial direction of the rod.

[0077] Alternatively, a third threaded tooth that is screwed into a threaded hole provided in the door leaf is formed on the second shaft portion of the opening bolt between the second head portion and the second small diameter portion. According to this structure, when the door leaf is closed, the opening bolt can be fixed to the door leaf by screwing the third threaded tooth of the opening bolt into the threaded hole provided in the door leaf.

[0078] Explanation of symbols:

[0079] 1 Tunnel Boring Machine

[0080] 3 Cutting disc

[0081] 5 Cutting drum

[0082] 5a Opening

[0083] 48 threaded holes

[0084] 53 inner wall part

[0085] 54 Outer wall

[0086] 6 Closing bolt

[0087] 61 First Head

[0088] 62 First shaft

[0089] 63 First thread

[0090] 64 First trail section

[0091] 7 Door

[0092] 78, 79 threaded holes

[0093] 8 Opening bolt

[0094] 81 Second Head

[0095] 82 Second shaft

[0096] 83 Second thread

[0097] 84 Second small path

[0098] 85 Third thread

[0099] 9 Sliding plate

[0100] 94 threaded holes

[0101] 95 strokes.

Claims

1. A tunnel boring machine, characterized in that: have: an annular cutting drum rotating with the cutting disc, comprising an inner wall portion and an outer wall portion, either of which is provided with an opening for accessing the interior of the cutting drum, and A door leaf fixed to the inner wall portion or the outer wall portion by a closing bolt in a state of closing the opening; The sealing bolt includes a head and a shaft, a threaded tooth for screwing into a threaded hole provided in the door is formed on the tip end of the shaft, and a small diameter portion having a diameter smaller than the outer diameter of the threaded tooth is provided on the shaft at a side closer to the head than the threaded tooth; The inner wall portion or the outer wall portion is provided with a threaded hole through which the small diameter portion of the shaft portion of the sealing bolt is inserted and which can be screwed with the thread teeth; The head, shaft, thread and small diameter portion of the sealing bolt are respectively a first head, a first shaft, a first thread and a first small diameter portion; A sliding disk is also provided which is arranged inside the cutting drum and can slide along the axial direction of the cutting drum; The door leaf is fixed to the sliding plate by an opening bolt when the opening is open; The opening bolt includes a second head and a second shaft portion, a second thread tooth is formed on the tip end of the second shaft portion to be screwed into the threaded hole provided in the sliding plate, and a second small diameter portion having a diameter smaller than the outer diameter of the second thread tooth is provided on the second shaft portion at a side closer to the second head than the second thread tooth; The door leaf is provided with a threaded hole which can be screwed with the second thread.

2. The tunnel boring machine according to claim 1, characterized in that The door leaf is provided with a rod penetrating the sliding plate; The rod is held by the sliding plate so as to be slidable in the axial direction of the rod.

3. The tunnel boring machine according to claim 1 or 2, characterized in that: A third thread that is screwed into a threaded hole provided in the door is formed on the second shaft portion of the opening bolt between the second head portion and the second small diameter portion.

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