JP2022034639A - Tunnel excavator - Google Patents

Abstract

To provide a tunnel excavator capable of extending a life of entire sand seals without increasing the number of the sand seals aligned in an axis direction of a cutter drum.SOLUTION: A tunnel excavator includes a cutter head, an annular cutter drum 4 attached to the cutter head, and a cylindrical body (31 or 33) facing a periphery surface which is an outer periphery surface or an inner periphery surface of the cutter drum 4. An intermediate member (5 or 7) is disposed between the periphery surface of the cutter drum 4 and the cylindrical body. The intermediate member forms a first gap (11 or 13) with the periphery surface of the cutter drum 4 and a second gap (12 or 14) with the cylindrical body. The first gap is sealed by at least one first sand seal (61 or 82), and the second gap is sealed by at least one second sand seal (63 or 83). The intermediate member is configured to be selectively fixed to one of the cutter drum and the cylindrical body.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tunnel excavator.

Conventionally, a tunnel excavator in which a cutter head for excavating a ground is rotatably supported by an excavator main body via an annular cutter drum has been known. The excavator body includes an inner cylinder facing the inner peripheral surface of the cutter drum and an outer cylinder facing the outer peripheral surface of the cutter drum, between the cutter drum and the inner cylinder and between the cutter drum and the outside. A plurality of earth and sand seals are arranged between the cylinder and the cylinder (see, for example, Patent Document 1). These earth and sand seals are aligned in the axial direction of the cutter drum and seal the gap between the cutter drum and the inner cylinder and the gap between the cutter drum and the outer cylinder.

Japanese Unexamined Patent Publication No. 11-6482

The earth and sand seal wears due to the rotation of the cutter drum. Sediment seal wear is most noticeable on the most anterior sediment seals exposed to sediment. When the wear of the earth and sand seal located at the frontmost position (first from the front) progresses and the water stopping property is lost, the earth and sand seal located at the second position from the front is exposed to the earth and sand. Therefore, it is conceivable to extend the life of the entire earth and sand seals by increasing the number of earth and sand seals arranged in the axial direction of the cutter drum to, for example, 5 or more.

However, in a configuration in which the number of earth and sand seals arranged in the axial direction of the cutter drum is increased, it is necessary to increase the length of the seal region. Moreover, since the wear of the earth and sand seal that has not been exposed to the earth and sand progresses to some extent, the number of rotations that can keep the water stoppage of the second earth and sand seal after being exposed to the earth and sand is that of the first earth and sand seal. It will be less than the number of revolutions that can maintain water stoppage.

Therefore, an object of the present invention is to provide a tunnel excavator capable of extending the life of the entire earth and sand seals without increasing the number of earth and sand seals arranged in the axial direction of the cutter drum.

In order to solve the above problems, the tunnel excavator of the present invention faces the cutter head, the annular cutter drum attached to the cutter head, and the peripheral surface which is the outer peripheral surface or the inner peripheral surface of the cutter drum. A first gap that can communicate with the space around the cutter head is formed between the tubular body and the peripheral surface of the cutter drum arranged between the peripheral surface of the cutter drum and the tubular body. At the same time, an intermediate member forming a second gap that can communicate with the space around the cutter head between the tubular body, at least one first earth and sand seal that seals the first gap, and the first earth and sand seal. The intermediate member includes at least one second earth and sand seal that seals two gaps, and the intermediate member is configured to be selectively fixable to one of the cutter drum and the tubular body.

According to the above configuration, if the intermediate member is fixed to the cutter drum, the intermediate member rotates together with the cutter drum, so that the second earth and sand seal between the intermediate member and the tubular body wears, but the intermediate member and the cutter drum The first earth and sand seal in between does not wear. On the contrary, if the intermediate member is fixed to the tubular body, the intermediate member does not rotate, so that the first earth and sand seal is worn, but the second earth and sand seal is not worn. That is, by fixing the intermediate member to one of the cutter drum and the tubular body, one of the first earth and sand seal and the second earth and sand seal can be slid with the sliding surface while the other can be preserved. Then, when one of the first earth and sand seal and the second earth and sand seal is worn out, the intermediate member is fixed to the other of the cutter drum and the cylindrical body, so that the earth and sand seal that slides on the sliding surface is the first earth and sand. It is possible to switch from one of the seal and the second earth and sand seal to the other. As a result, the life of the entire earth and sand seals can be extended without increasing the number of earth and sand seals arranged in the axial direction of the cutter drum.

According to the present invention, it is possible to extend the life of the entire earth and sand seals without increasing the number of earth and sand seals arranged in the axial direction of the cutter drum.

It is sectional drawing of the tunnel excavator which concerns on one Embodiment of this invention. It is an enlarged view of the main part of FIG. 1, and shows the state which the outer intermediate member is fixed to the body part, and the inner intermediate member is fixed to the peripheral wall through a bulkhead. It is an enlarged view of the main part of FIG. 1, and shows the state which the outer intermediate member and the inner intermediate member are fixed to the base plate of a cutter drum.

FIG. 1 shows a tunnel excavator 1 according to an embodiment of the present invention. For example, the tunnel excavator 1 is a shield excavator that internally assembles segments. However, the present invention is also applicable to tunnel excavators other than shield excavators. The traveling direction of the tunnel excavator 1 is forward, and the opposite direction is backward.

The tunnel excavator 1 includes a cutter head 2 for excavating a ground, an annular cutter drum 4 attached to the cutter head 2, and an excavator main body 3 that rotatably supports the cutter head 2 via the cutter drum 4. include.

In the present embodiment, the cutter head 2 is a roller cutter type, but the cutter head 2 may be a cutter bit type. Alternatively, the cutter head 2 may include both a roller cutter and a cutter bit.

The cutter head 2 includes a plurality of cutter frames 21 arranged radially from the center of the cutter head 2 (which is also the center of the excavator main body 3), and the roller cutter 22 is supported by these cutter frames 21. .. Each cutter frame 21 extends in the radial direction of the cutter head 2, and its tip is connected to the cutter drum 4.

However, the configuration of the cutter head 2 and the method of attaching the cutter drum 4 to the cutter head 2 can be appropriately changed. For example, the cutter head 2 may have a disk shape, the cutter drum 4 may have an annular shape of about half the diameter of the cutter head 2, and the cutter drum 4 may be attached to the cutter head 2 via a plurality of columns.

The cutter drum 4 includes a base plate 41 that constitutes the front surface of the cutter drum 4, and a drum body 42 that constitutes the inner peripheral surface, the outer peripheral surface, and the rear surface of the cutter drum 4. For example, the drum body 42 has a groove shape that opens toward the front, and the opening is closed by the base plate 41. The base plate 41 is an annular plate whose thickness direction is the axial direction of the cutter drum 4.

The excavator main body 3 includes a cylindrical body portion 31 for accommodating the cutter drum 4, a bulkhead 32 that covers the inner opening of the cutter drum 4 from the front, and a peripheral wall 33 that extends rearward from the peripheral edge of the bulkhead 32. Further, although not shown, the excavator main body 3 includes a support wall for connecting the peripheral wall 33 to the body portion 31 behind the cutter drum 4, and the cutter drum 4 is supported by the support wall via a swivel bearing. ..

The body portion 31 is an outer tubular body facing the outer peripheral surface of the cutter drum 4, and the peripheral wall 33 is an inner tubular body facing the inner peripheral surface of the cutter drum 4. However, the outer tubular body of the present invention does not necessarily have to be the body portion 31, and if the diameter of the cutter drum 4 is small, it may be a peripheral wall separated inward from the body portion 31.

A cutter chamber 20 into which the earth and sand excavated by the cutter head 2 flows is formed between the bulkhead 32 and the cutter head 2. Further, a shoulder space 23 is formed between the cutter head 2 and the body portion 31. The portion of the cutter chamber 20 adjacent to the cutter head 2 and the shoulder space 23 are spaces around the cutter head 2.

Next, with reference to FIGS. 2 and 3, a seal structure between the cutter drum 4 and the body portion 31 and a seal structure between the cutter drum 4 and the peripheral wall 33 will be described.

An outer intermediate member 5 is arranged between the outer peripheral surface of the cutter drum 4 and the body portion 31, and an inner intermediate member 7 is arranged between the inner peripheral surface of the cutter drum 4 and the peripheral wall 33. The outer intermediate member 5 forms an outer first gap 11 that can communicate with the shoulder space 23 between the outer intermediate member 5 and the outer peripheral surface of the cutter drum 4, and the outer intermediate member 5 and the body portion 31. An outer second gap 12 that can communicate with the shoulder space 23 is formed between them. The inner intermediate member 7 forms an inner first gap 13 that can communicate with the cutter chamber 20 between the inner intermediate member 7 and the inner peripheral surface of the cutter drum 4, and the inner intermediate member 7 and the peripheral wall 33 form an inner first gap 13. An inner second gap 14 that can communicate with the cutter chamber 20 is formed between them.

At least one outer first earth and sand seal 61 for sealing the outer first gap 11 is arranged between the outer intermediate member 5 and the outer peripheral surface of the cutter drum 4. In this embodiment, four outer first earth and sand seals 61 are arranged in the axial direction of the cutter drum 4. However, the number of the outer first earth and sand seals 61 may be 2, 3, or 5 or more. Alternatively, as the outer first earth and sand seal 61, one earth and sand seal having a plurality of lips may be used.

Further, in the present embodiment, the outer first earth and sand seal 61 is attached to the cutter drum 4 by the seal retainer 62 (detailed structure is not shown). However, contrary to the present embodiment, the outer first earth and sand seal 61 may be attached to the outer intermediate member 5 by the seal retainer 62.

At least one outer second earth and sand seal 63 for sealing the outer second gap 12 is arranged between the outer intermediate member 5 and the body portion 31. In this embodiment, four outer second earth and sand seals 63 are arranged in the axial direction of the cutter drum 4. However, the number of the outer second earth and sand seals 63 may be 2, 3, or 5 or more. Alternatively, as the outer second earth and sand seal 63, one earth and sand seal having a plurality of lips may be used.

Further, in the present embodiment, the outer second earth and sand seal 63 is attached to the outer intermediate member 5 by the seal retainer 64 (detailed structure is not shown). However, contrary to the present embodiment, the outer second earth and sand seal 63 may be attached to the body portion 31 by the seal retainer 64.

The outer intermediate member 5 is configured to be selectively fixable to one of the cutter drum 4 and the body portion 31. In the present embodiment, the shaft of the cutter drum 4 is located between the driven position (see FIG. 3) in which the outer intermediate member 5 is fixed to the cutter drum 4 and the stationary position (see FIG. 2) fixed to the body portion 31. It can slide in the direction.

Specifically, the outer intermediate member 5 includes a tubular portion 51 extending in the axial direction of the cutter drum 4, and a flange portion 52 protruding radially outward from the front end of the tubular portion 51. At the stationary position shown in FIG. 2, the flange portion 52 comes into contact with the tip surface of the body portion 31. That is, in the stationary position, the opening of the outer second gap 12 with respect to the shoulder space 23 is closed by the outer intermediate member 5. On the other hand, at the driven position shown in FIG. 3, the flange portion 52 comes into contact with the base plate 41 of the cutter drum 4. That is, in the driven position, the opening of the outer first gap 11 with respect to the shoulder space 23 is closed by the outer intermediate member 5.

More specifically, the flange portion 52 of the outer intermediate member 5 is provided with a plurality of bolts 91 (only one bolt 91 is shown in FIGS. 2 and 3) arranged at a predetermined pitch in the circumferential direction at a stationary position. It is fastened to 31 and is fastened to the base plate 41 of the cutter drum 4 by bolts 91 in the driven position.

The tip surface of the body portion 31 is provided with a screw hole 35 for screwing with the bolt 91, and the flange portion 52 is provided with an insertion hole 54 into which the bolt 91 is inserted at a position corresponding to the screw hole 35. Has been done. Further, the base plate 41 of the cutter drum 4 is provided with an insertion hole 43 into which the bolt 91 is inserted, and the flange portion 52 has a screw hole 53 screwed with the bolt 91 at a position corresponding to the insertion hole 43. Is provided.

At least one inner first earth and sand seal 81 for sealing the inner first gap 13 is arranged between the inner intermediate member 7 and the inner peripheral surface of the cutter drum 4. In this embodiment, four inner first earth and sand seals 81 are arranged in the axial direction of the cutter drum 4. However, the number of the inner first earth and sand seals 81 may be 2, 3, or 5 or more. Alternatively, as the inner first earth and sand seal 81, one earth and sand seal having a plurality of lips may be used.

Further, in the present embodiment, the inner first earth and sand seal 81 is attached to the inner intermediate member 7 by the seal retainer 82 (detailed structure is not shown). However, contrary to the present embodiment, the inner first earth and sand seal 81 may be attached to the cutter drum 4 by the seal retainer 82.

At least one inner second earth and sand seal 83 that seals the inner second gap 14 is arranged between the inner intermediate member 7 and the peripheral wall 33. In this embodiment, four inner second earth and sand seals 83 are arranged in the axial direction of the cutter drum 4. However, the number of the inner second earth and sand seals 83 may be 2, 3, or 5 or more. Alternatively, as the inner second earth and sand seal 83, one earth and sand seal having a plurality of lips may be used.

Further, in the present embodiment, the inner second earth and sand seal 83 is attached to the peripheral wall 33 by the seal retainer 84 (detailed structure is not shown). However, contrary to the present embodiment, the inner second earth and sand seal 83 may be attached to the inner intermediate member 7 by the seal retainer 84.

The inner intermediate member 7 is configured to be selectively fixable to one of the cutter drum 4 and the peripheral wall 33. In the present embodiment, the inner intermediate member 7 is located between a driven position fixed to the cutter drum 4 (see FIG. 3) and a stationary position fixed to the peripheral wall 33 via the bulkhead 32 (see FIG. 2). It is slidable in the axial direction of the cutter drum 4.

Specifically, the inner intermediate member 7 includes a tubular portion 71 extending in the axial direction of the cutter drum 4, and a flange portion 72 protruding radially outward from the front end of the tubular portion 71. At the stationary position shown in FIG. 2, the flange portion 72 comes into contact with the bulkhead 32. That is, in the stationary position, the opening of the inner second gap 14 with respect to the cutter chamber 20 is closed by the inner intermediate member 7. On the other hand, at the driven position shown in FIG. 3, the flange portion 72 comes into contact with the base plate 41 of the cutter drum 4. That is, in the driven position, the opening of the inner first gap 13 with respect to the cutter chamber 20 is closed by the inner intermediate member 7.

More specifically, the flange portion 72 of the inner intermediate member 7 is bulkheaded by a plurality of bolts 92 (only one bolt 92 is shown in FIGS. 2 and 3) arranged at a predetermined pitch in the circumferential direction at a stationary position. It is fastened to 32, and in the driven position, it is fastened to the base plate 41 of the cutter drum 4 by a bolt 92.

The bulkhead 32 is provided with an insertion hole 34 into which the bolt 92 is inserted, and the flange portion 72 is provided with a screw hole 74 to be screwed with the bolt 92 at a position corresponding to the insertion hole 34. .. Further, the base plate 41 of the cutter drum 4 is provided with a screw hole 44 to be screwed with the bolt 91, and the flange portion 52 has an insertion hole 73 into which the bolt 92 is inserted at a position corresponding to the screw hole 44. Is provided.

In the tunnel excavator 1 having the above-described configuration, if the outer intermediate member 5 is fixed to the cutter drum 4, the outer intermediate member 5 rotates together with the cutter drum 4, so that the outer third member between the outer intermediate member 5 and the body 31 2 The earth and sand seal 63 wears, but the outer first earth and sand seal 61 between the outer intermediate member 5 and the cutter drum 4 does not wear. On the contrary, if the outer intermediate member 5 is fixed to the body portion 31, the outer intermediate member 5 does not rotate, so that the outer first earth and sand seal 61 wears, but the outer second earth and sand seal 63 does not wear. That is, by fixing the outer intermediate member 5 to one of the cutter drum 4 and the body portion 31, one of the outer first earth and sand seal 61 and the outer second earth and sand seal 63 is slid with the sliding surface, and the other is preserved. can do. Then, when one of the outer first earth and sand seal 61 and the outer second earth and sand seal 63 is worn, the outer intermediate member 5 is fixed to the other of the cutter drum 4 and the body portion 31 so as to slide with the sliding surface. The outer earth and sand seal to be used can be switched from one of the outer first earth and sand seal 61 and the outer second earth and sand seal 63 to the other. As a result, the life of the entire outer sediment seal can be extended without increasing the number of outer sediment seals arranged in the axial direction of the cutter drum 4.

Similarly, if the inner intermediate member 7 is fixed to the cutter drum 4, the inner intermediate member 7 rotates together with the cutter drum 4, so that the inner second earth and sand seal 83 between the inner intermediate member 7 and the peripheral wall 33 wears but is inside. The inner first earth and sand seal 81 between the intermediate member 7 and the cutter drum 4 does not wear. On the contrary, if the inner intermediate member 7 is fixed to the peripheral wall 33, the inner intermediate member 7 does not rotate, so that the inner first earth and sand seal 81 wears, but the inner second earth and sand seal 83 does not wear. That is, by fixing the inner intermediate member 7 to one of the cutter drum 4 and the peripheral wall 33, one of the inner first earth and sand seal 81 and the inner second earth and sand seal 83 is slid with the sliding surface, and the other is preserved. be able to. Then, when one of the inner first earth and sand seal 81 and the inner second earth and sand seal 83 is worn, the inner intermediate member 7 is fixed to the other of the cutter drum 4 and the peripheral wall 33 to slide on the sliding surface. The inner earth and sand seal can be switched from one of the inner first earth and sand seal 81 and the inner second earth and sand seal 83 to the other. As a result, the life of the entire inner sediment seal can be extended without increasing the number of inner sediment seals arranged in the axial direction of the cutter drum 4.

Further, in the present embodiment, when the outer intermediate member 5 slides, the flange portion 52 of the outer intermediate member 5 comes into contact with either the tip surface of the body portion 31 or the base plate 41 of the cutter drum 4, so that the body portion 31 and the body portion 31 The base plate 41 can be used as a stopper for the outer intermediate member 5.

Further, in the present embodiment, when the inner intermediate member 7 slides, the flange portion 72 of the inner intermediate member 7 comes into contact with either the bulkhead 32 or the base plate 41 of the cutter drum 4, so that the bulkhead 32 and the base plate 41 are used. It can be used as a stopper for the inner intermediate member 7.

(Modification example)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, the outer intermediate member 5 does not necessarily have to be slidable in the axial direction of the cutter drum 4. For example, without changing the position of the outer intermediate member 5 in the axial direction of the cutter drum 4, simply changing the position and orientation of the bolt for fastening the outer intermediate member 5 to the cutter drum 4 or the body 31 is required to change the outer side. It may be switched whether the intermediate member 5 is fixed to the cutter drum 4 or the body portion 31.

However, with the configuration as in the above embodiment, the outer sediment seal 61 of the outer first sediment seal 61 and the outer second sediment seal 63, whichever is preserved, is prevented from being exposed to the sediment. As a result, the outer earth and sand seal on the side to be preserved can be kept clean. Further, after switching the outer earth and sand seal that slides on the sliding surface from one of the outer first earth and sand seal 61 and the outer second earth and sand seal 63 to the other, the outer earth and sand seal that has been worn may be exposed to the earth and sand. Be prevented. This makes it possible to prevent the earth and sand from leaking from the outer earth and sand seal where the wear has progressed.

Similarly, the inner intermediate member 7 does not necessarily have to be slidable in the axial direction of the cutter drum 4. For example, without changing the position of the inner intermediate member 7 in the axial direction of the cutter drum 4, it is only necessary to change the position and orientation of the bolt for fastening the inner intermediate member 7 to the cutter drum 4 or the peripheral wall 33. It may be switched whether the member 7 is fixed to the cutter drum 4 or the peripheral wall 33.

However, with the configuration as in the above embodiment, the inner sediment seal 81 of the inner first sediment seal 81 and the inner second sediment seal 83, whichever is preserved, is prevented from being exposed to the sediment. This allows the inner sediment seal on the preserved side to be kept clean. Further, after switching the inner earth and sand seal that slides on the sliding surface from one of the inner first earth and sand seal 81 and the inner second earth and sand seal 83 to the other, the inner earth and sand seal that has been worn may be exposed to the earth and sand. Be prevented. This makes it possible to prevent the earth and sand from leaking from the inner earth and sand seal where the wear has progressed.

Further, a plurality of outer intermediate members 5 slidable independently of each other are arranged between the outer peripheral surface of the cutter drum 4 and the body portion 31, and one or a plurality of outer intermediate members 5 are arranged between the outer intermediate members 5. An outer sediment seal may be placed. In other words, between the cutter drum 4 and the body portion 31, the configuration in which the outer intermediate member 5 is interposed between the gaps sealed by the outer earth and sand seal may be repeated in the radial direction of the cutter drum 4.

Similarly, a plurality of inner intermediate members 7 that can slide independently of each other are arranged between the inner peripheral surface of the cutter drum 4 and the peripheral wall 33, and one or a plurality of inner intermediate members 7 are arranged between the inner intermediate members 7. An inner sediment seal may be placed. In other words, between the cutter drum 4 and the peripheral wall 33, the configuration in which the inner intermediate member 7 is interposed between the gaps sealed by the inner earth and sand seal may be repeated in the radial direction of the cutter drum 4.

(summary)
The tunnel excavator of the present invention includes a cutter head, an annular cutter drum attached to the cutter head, a tubular body facing the peripheral surface which is the outer peripheral surface or the inner peripheral surface of the cutter drum, and the cutter drum. A first gap that can communicate with the space around the cutter head is formed between the peripheral surface of the cutter drum and the peripheral surface of the cutter drum, which is arranged between the peripheral surface of the cylinder and the tubular body. An intermediate member forming a second gap that can communicate with the space around the cutter head, at least one first earth and sand seal that seals the first gap, and at least one that seals the second gap. A second earth and sand seal is provided, and the intermediate member is configured to be selectively fixable to one of the cutter drum and the tubular body.

According to the above configuration, if the intermediate member is fixed to the cutter drum, the intermediate member rotates together with the cutter drum, so that the second earth and sand seal between the intermediate member and the tubular body wears, but the intermediate member and the cutter drum The first earth and sand seal in between does not wear. On the contrary, if the intermediate member is fixed to the tubular body, the intermediate member does not rotate, so that the first earth and sand seal is worn, but the second earth and sand seal is not worn. That is, by fixing the intermediate member to one of the cutter drum and the tubular body, one of the first earth and sand seal and the second earth and sand seal can be slid with the sliding surface while the other can be preserved. Then, when one of the first earth and sand seal and the second earth and sand seal is worn out, the intermediate member is fixed to the other of the cutter drum and the cylindrical body, so that the earth and sand seal that slides on the sliding surface is the first earth and sand. It is possible to switch from one of the seal and the second earth and sand seal to the other. As a result, the life of the entire earth and sand seals can be extended without increasing the number of earth and sand seals arranged in the axial direction of the cutter drum.

The intermediate member is slidable in the axial direction of the cutter drum between a driven position fixed to the cutter drum and a stationary position fixed to the tubular body, and in the driven position, the cutter head The opening of the first gap with respect to the surrounding space may be closed, and the opening of the second gap with respect to the space around the cutter head may be closed at the stationary position. According to this configuration, it is possible to prevent the preserved earth and sand seal from being exposed to the earth and sand among the first earth and sand seal and the second earth and sand seal. This makes it possible to keep the earth and sand seal on the side to be preserved clean. Further, after switching the earth and sand seal that slides on the sliding surface from one of the first earth and sand seal and the second earth and sand seal to the other, it is possible to prevent the earth and sand seal that has been worn from being exposed to the earth and sand. This makes it possible to prevent the earth and sand from leaking from the earth and sand seal where the wear has progressed.

For example, the intermediate member may include a cylindrical portion extending in the axial direction of the cutter drum and a flange portion protruding radially outward from the front end of the tubular portion.

The cylindrical body is an outer cylindrical body facing the outer peripheral surface of the cutter drum, the cutter drum includes an annular base plate having the axial direction of the cutter drum as a thickness direction, and the flange portion has a flange portion. At the stationary position, it may come into contact with the tip surface of the outer tubular body, and at the driven position, it may come into contact with the base plate. According to this configuration, the cylindrical body and the base plate can be used as a stopper for the intermediate member.

Alternatively, the cylindrical body is an inner tubular body facing the inner peripheral surface of the cutter drum, and the tunnel excavator has a bulkhead that extends radially outward beyond the inner tubular body. Further provided, the cutter drum includes an annular base plate whose thickness direction is the axial direction of the cutter drum, and the flange portion abuts on the bulkhead at the stationary position and is inside the bulkhead via the bulkhead. It may be fixed to a tubular body and abut on the base plate at the driven position. According to this configuration, the bulkhead and the base plate can be used as a stopper for the intermediate member.

1 Tunnel excavator 11 Outer 1st gap 12 Outer 2nd gap 13 Inner 1st gap 14 Inner 2nd gap 2 Cutter head 31 Body (outer tubular body)
32 Bulkhead 33 Circumferential wall (inner tubular body)
4 Cutter drum 41 Base plate 5 Outer intermediate member 51 Cylindrical part 52 Flange part 61 Outer first earth and sand seal 63 Outer second earth and sand seal 7 Inner intermediate member 71 Cylindrical part 72 Flange part 81 Inner first earth and sand seal 83 Inner second earth and sand sticker

Claims (5)

With the cutter head,
An annular cutter drum attached to the cutter head and
A cylindrical body facing the peripheral surface which is the outer peripheral surface or the inner peripheral surface of the cutter drum, and
A first gap that can communicate with the space around the cutter head is formed between the peripheral surface of the cutter drum and the peripheral surface of the cutter drum arranged between the peripheral surface of the cutter drum and the cylinder. An intermediate member that forms a second gap that can communicate with the space around the cutter head between the shape and the body.
At least one first earth and sand seal that seals the first gap, and
A second earth and sand seal, which seals the second gap, is provided.
The intermediate member is a tunnel excavator configured to be selectively fixed to one of the cutter drum and the tubular body. The intermediate member is slidable in the axial direction of the cutter drum between a driven position fixed to the cutter drum and a stationary position fixed to the tubular body, and in the driven position, the cutter head The tunnel excavator according to claim 1, wherein the opening of the first gap with respect to the surrounding space is closed, and the opening of the second gap with respect to the space around the cutter head is closed at the stationary position. The tunnel excavator according to claim 2, wherein the intermediate member includes a tubular portion extending in the axial direction of the cutter drum and a flange portion protruding radially outward from the front end of the tubular portion. The tubular body is an outer tubular body facing the outer peripheral surface of the cutter drum.
The cutter drum includes an annular base plate whose thickness direction is the axial direction of the cutter drum.
The tunnel excavator according to claim 3, wherein the flange portion abuts on the tip surface of the outer tubular body in the stationary position and abuts on the base plate in the driven position. The tubular body is an inner tubular body facing the inner peripheral surface of the cutter drum.
Further equipped with a bulkhead that juts out radially outward beyond the inner cylinder.
The cutter drum includes an annular base plate whose thickness direction is the axial direction of the cutter drum.
The tunnel excavator according to claim 3, wherein the flange portion abuts on the bulkhead at the stationary position, is fixed to the inner cylindrical body via the bulkhead, and abuts on the base plate at the driven position. ..

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