JP3247852B2 - Deformed parent and child shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified parent-child shield excavator in which a child shield machine having, for example, a circular cross section is incorporated inside a parent shield machine having a substantially rectangular cross section.

[0002]

2. Description of the Related Art Conventionally, a child shield machine having a circular cross section and a small diameter is also arranged inside a parent shield machine having a circular cross section and a large diameter, and excavation by the child shield machine is performed continuously with excavation by the parent shield machine. A known parent-child shield excavator is known.

[0003] In the case of a tunnel for flowing a fluid such as a sewer, for example, a tunnel having a required cross section can be excavated by a parent-child shield excavator made of a combination of circles as described above. However, when excavating a station building and a tunnel between station buildings on a subway with a parent-child shield excavator at the same time, the use of the parent-child shield excavator as described above causes inconvenience as described below. That is, while the station building needs a wide cross section so as not to hinder the getting on and off of the people, the tunnel between the station buildings only needs to have a minimum circular cross section through which the train can pass. However, in the conventional parent-child shield excavator as described above, as shown in FIG.
In addition, the station building 52 also has a circular cross section, and unnecessary spaces 53 are formed above and below the station building 52.

[0004] Incidentally, as a structure in which a deformed section other than a circular section is excavated by a parent shield machine, for example, JP-A-2-210189 or JP-A-4-293 is disclosed.
No. 897 is disclosed. In the former (JP-A-2-210189), as shown in FIG. 8, a large number of child shield machines 5 having a circular cross section are used.
4a, 54b, 54c, and so on, a tunnel having an irregular cross section is excavated, and a plurality of small-diameter tunnels are excavated continuously to the tunnel. In the case of the latter (JP-A-4-293897), as shown in FIG. 9, behind a shield machine having a plurality of rotary cutters 55a and 55b, these rotary cutters 55a and 55b are provided.
The swing arm cutters 56a, 56b, 56c, 56d for excavating the remaining ground excavated in 5b are arranged, and the rotary cutter and the swing arm cutter excavate a substantially elliptical cross section. ing.

On the other hand, as a shield section excavator having an irregular cross section capable of excavating a substantially rectangular cross section, Japanese Patent Application No. Hei 8 (JP-A-Hei) 8-49, proposed by the present applicant.
No. 296489. In the modified section shield excavator according to this proposal, a plurality of cutter heads are arranged so that the excavation ranges partially overlap each other, and the cutter heads are swung so that adjacent cutter heads do not interfere with each other, and The cutter head is configured to be fitted with a radially extendable overcutter.

[0006]

However, in a parent-child shield machine capable of excavating a deformed section as disclosed in each of the above publications, it is difficult to excavate a rectangular section, or it is almost rectangular. When a section is to be excavated, it is necessary to arrange a large number of small-diameter sub-shielding machines, which complicates the structure and increases the size of the entire apparatus.

[0007] On the other hand, in the above-mentioned prior application proposed by the present applicant, it is possible to excavate a substantially rectangular cross section. It cannot be used for the purpose of excavating the station building part and the tunnel between the station buildings at the same time.

The present invention has been made in view of such a problem, and it is possible to construct, for example, excavation of a subway station and a tunnel between the stations with a minimum excavation cross section by a simple structure. It is an object of the present invention to provide a deformed parent-child shield machine.

[0009]

In order to achieve the above-mentioned object, a deformed parent-child shield excavator according to the present invention has a child shield machine built in a parent shield machine having a skin plate having a substantially rectangular cross section. A parent-child shield excavator in which the parent shield machine and the child shield machine share at least a part of a cutter head and a cutter head drive unit, wherein the child shield machine is a substantially rectangular cross-section alone.
Digging means capable of digging a plurality of rectangular cross-section digging means capable of digging a substantially rectangular cross-section inside the parent shield machine.
Having a plurality of rectangular cross-section digging means.
Excavating a substantially rectangular cross section, and
The excavation means of the child shield machine includes a plurality of
Forming one of the rectangular cross-section digging means,
The plurality of rectangular section excavating means of the shield machine has an
They are arranged to form the same plane, and
Drive them so that they do not interfere with each other
It is characterized by being performed .

According to the present invention, a large-diameter tunnel having a substantially rectangular section is excavated by integrally excavating the parent and child shield machines, and a small-diameter tunnel having, for example, a circular cross section is used alone by the child shield machine after the excavation is completed. Can be drilled. That is, a single shield excavator can continuously excavate a rectangular cross section and a tunnel having a small diameter, for example, a circular cross section. Therefore, for example, a tunnel such as a junction of a railway tunnel or a road tunnel between a subway station building and the station building,
It can be constructed with the minimum required excavation section. Also,
In the present invention, since the parent shield machine and the child shield machine have a structure in which at least a part of the cutter head and the cutter head driving unit are shared, the structure can be simplified as a whole. In this case, the combination of the parent shield machine and the child shield machine, in other words, the number or arrangement position of the child shield machines arranged in the parent shield machine can be arbitrarily set for each construction condition. When the child shield machine has a circular cross section, it is easy to stop the water when the child shield machine separates and starts from the parent shield machine, and it is possible to safely and securely stop the water and start the separation shield.

[0011] In the present invention, the rectangular cross-section excavation means, and even better a structure having a retractable plurality of over-cutter in the radial direction of the mosquito Ttaheddo. When such an overcutter is provided, by extending the overcutter at a required position, it is possible to excavate not only a shape in which circles are overlapped in parallel but also a wider area such as a rectangular cross section. Further, by changing the distance between the centers of the adjacent cutter heads or changing the extension length of the over cutter, it is possible to set an optimum rectangular cross section for each construction condition. Also, the cutter in this rectangular cross section excavating means
The head is preferably of the spoke type.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a deformed parent-child shield excavator according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view (a view taken in the direction of arrow C in FIG. 3) of a variant parent-child shield excavator according to an embodiment of the present invention, and a cutter head drive mechanism (BB in FIG. 3) of the shield excavator. FIG. 2 is a longitudinal sectional view (FIG. 1) of the shield machine.
3 is shown in FIG.

A variant parent-child shield machine 1 according to the present embodiment.
Is applied to a muddy shield machine,
A main shield machine 3 having a skin plate 2 having a substantially rectangular cross section and a child shield machine 5 having a skin plate 4 having a circular cross section housed near one side of the main shield machine 3 are provided. I have.

A first cutter head 6 for the parent shield machine 3 is provided in front of the skin plate 2 of the parent shield machine 3.
And the second used by the parent shield machine 3 and the child shield machine 5
And the cutter head 7 are arranged side by side on the left and right.
Chamber sections 9 and 42 are formed behind the cutter heads 6 and 7, and a mud feeding pipe 10 and a mud discharging pipe 11 are provided in these chamber sections so as to open their tips. A ring girder 12 is fixed to the inner wall surface of the skin plate 2.
A large number of parent shield jacks 13 are fixed to the flange portion mounted on the main body. The parent shield machine 3 digs underground while receiving a reaction force on the segment 14 by the parent shield jack 13. In FIG. 3, reference numeral 15 denotes a deck, and reference numeral 16 denotes an erector.

The first cutter head 6 provided on the parent shield machine 3 is a spoke type cutter head.
The spokes 17, 18, 19, 20 are arranged so that the angle between adjacent spokes is 90 °, and the length of one inner spoke 20 is the other three spokes 17. The spokes 20 having a length shorter than the length of the spokes 19 to 19 are arranged such that the distal ends of the spokes 20 having the shorter length do not interfere with the second cutter head 7.

Each of the spokes 17 to 20 is provided with a leading bit 21 at the center and a tool bit 22 at both sides, and a face is excavated by the bits 21 and 22. In addition, the other three spokes 17 to 19 except the inner spoke 20 have a built-in overcutter device, and the overcutter 23 provided at the distal end of the overcutter device moves outward from the distal ends of the spokes 17 to 19. By protruding, the ground at the outer peripheral portion can be excavated.

The main shaft 24 of the first cutter head 6 is
The front part is supported by a bush, and the rear part is supported by a bearing so as to be rotatable around the axis. The main shaft 24 has four brackets 25a,
The swinging jacks 27a, 27b, 27c, 25d are fixed between the brackets 25a to 25d and the brackets 26a, 26b, 26c, 26d fixed to the inner wall surface of the skin plate 2, respectively.
27d is attached. In this way, the pair of swinging jacks 27a and 27c, which are diagonally opposite each other, are operated in the extension direction, and at the same time, the other pair of swinging jacks 27a and 27c are operated.
By operating the first and second cutter heads 6 and 27d in the contracting direction, the first cutter head 6 is rotated by a predetermined angle, and after this rotation, the pair of swinging jacks 27a and 27c are simultaneously operated in the contracting direction. Pair of swinging jacks 27b, 27d
By operating the first cutter head 6 in the extension direction,
Is rotated in the opposite direction by a predetermined angle, and these operations are alternately repeated to cause the cutter head 6 to perform a rocking motion within a predetermined angle range (100 ° in the present embodiment). Have been.

On the other hand, the second cutter head 7 provided in the child shield machine 5 is a spoke type cutter head similar to the first cutter head 6, and has four spokes 28,2.
9, 30, 31 are arranged such that the angle between the spokes adjacent to each other is 90 °, and the lengths of the spokes 28 to 31 are the same. Also, like the first cutter head 6, each spoke 2
8 to 31, a leading bit 32 is provided at the center and a tool bit 33 is provided at both sides.
The face is excavated by 2,33. The other three spokes 2 except the inner spoke 29
An overcutter device is built in each of 8, 30, and 31, and an overcutter 34 provided at a distal end of the overcutter device protrudes outward from the distal end portion of each of the spokes 28, 30, and 31, so that the ground around the outer peripheral portion is removed. Are excavated.

In the child shield machine 5, the hydraulic motor 3
Frame section 36 supporting a cutter head drive section including
The skin plate 4 is provided on the outer peripheral side of the frame portion 36. This skin plate 4
Has a garter portion 37 and a hood portion 38 integrally formed at the front of the garter portion 37, and the skin plate 4 is disposed on the inner peripheral surface of the parent shield machine 3 or on the inner peripheral surface thereof. It is slidable forward along the inner peripheral surface of the guide cylinder 39 and the outer peripheral surface of the frame portion 36.
The rear end of the garter section 37 is bolted to the main body of the parent shield machine when the parent and child are digging together. A spacer 40 is detachably provided between the gutter section 37 and the frame section 36. This spacer 4
0 indicates that the frame 36
The rear part is bolted to the garter part 37 respectively, so that the tip of the hood part 38 is connected to the partition wall 4 of the parent shield machine 3.
1 are located on substantially the same plane. on the other hand,
When the child shield machine 5 excavates alone, the spacer 40 is removed and the skin plate 4 is slid forward (to the position indicated by the two-dot chain line in FIG. 3), whereby the chamber portion 42 of the parent shield machine 3 and the child shield The chamber section 9 of the machine 5 is partitioned.

The main shaft 43 of the second cutter head 7 is
The front part is supported by a bush 44 and the rear part is supported by a bearing 45 so as to be rotatable around the axis. When the parent shield machine 3 and the child shield machine 5 are integrally excavated, the main shaft 43 drives the hydraulic motor 35 in a forward / reverse switching manner to cause the second cutter head 7 to move within a predetermined angle range (the In the embodiment, when the swinging motion within 100 °) is performed and the child shield machine 5 is excavated independently, the hydraulic motor 35 is driven in a fixed direction, so that the second cutter head 7 is driven. To make a rotary motion. The swinging motion of each of the cutter heads 6, 7 is such that when one of the cutter heads 6 swings to the left in FIG. 1, the other cutter head 7 also swings to the left.
The cutter heads 6, 7 are driven synchronously so that the swinging directions of the left and right cutter heads 6, 7 coincide, so that the spokes or over cutters do not interfere with each other.

Further, in the present embodiment, an area D near the corner, which is an area outside the swing radius of the spokes 17 to 20, 28 to 31, and an upper and lower area E between the cutter heads 6, 7 are excavated. In these areas D and E, the over cutters 23 and 34 are provided with the spokes 17 to 20 so as to follow the shape of the front end face of the skin plate 2.
It protrudes outward from the tips of 28 to 31. As a result, it is possible to excavate not only a shape obtained by simply overlapping circular shapes in parallel but also a wide range of irregular cross-sections including a rectangular shape.

In the parent-child shield excavator having the above-described configuration, when the parent-child excavation is performed integrally, FIG.
As shown in (a), the first cutter head 6 and the second cutter head 7 are rocked, and excavation is performed while obtaining a reaction force on the segment 14 by the parent shield jack 13. At this time, the overcutters 23 and 34 of the cutter heads 6 and 7 are appropriately expanded and contracted to thereby
For example, a tunnel having a substantially rectangular section corresponding to a subway station is excavated.

When a small-diameter circular section tunnel is excavated following the excavation of the rectangular section tunnel, the erector 16 of the parent shield machine 3 and the auxiliary equipment are removed, and a tail portion, The following procedure is adopted in order to attach an erector and auxiliary facilities, and to further advance the skin plate 4 of the child shield machine 5. (1) The second cutter head 7 and the frame part 36 are fixed to the child shield machine main body. (2) The spacer 40 is connected to the frame part 36 and the garter part 3
The bolts respectively fixed to 7 are removed, and the spacers 40 are removed. (3) The fastening between the skin plate 4 and the main shield machine body is released. (4) Slide the skin plate 4 forward. (5) The frame portion 36 and the skin plate 4 are bolted together.

In this way, as shown in FIG. 4B, the skin plate 4 of the child shield machine 3 is advanced,
When the hood section 38 is advanced to a position that partitions the chamber section 42 of the parent shield machine 3 and the chamber section 9 of the child shield machine 5, the hydraulic motor 35 of the child shield machine 5 is switched from forward / reverse drive to rotary drive. . Thereby, the child shield machine 5 rotates the second cutter head 7 and, while receiving the reaction force, the child shield jack 47, which is a segment (not shown) for the child shield machine assembled behind the child shield machine 5. , Whereby a circular tunnel such as a tunnel between stations is excavated. At the time of excavation, the chamber part 9 is the hood part 3
Since it is covered with 8, the upper ground can be prevented from collapsing and the earth and sand can be reliably prevented from excessively flowing into the chamber portion 9.

In this embodiment, the distance between the centers of rotation (or swing) of the two cutter heads provided in the parent shield machine or the length of expansion and contraction of the over cutter is changed as shown in FIG. As shown, it is possible to set an optimal rectangular cross section for each construction condition.

In the present embodiment, the parent shield machine 3
Two cutter heads are built in, and one of them starts moving. The main shield machine (rectangular shield) that can excavate a tunnel with a rectangular section
An embodiment is also possible in which a single child shield machine (circular shield) capable of excavating a circular section tunnel is built in the machine. In this case, as shown in FIG. 6A, the position where the circular shield 48 is provided may be closer to one side of the rectangular shield 49, or may be, of course, the center of the rectangular shield 49. Further, as shown in FIG. 6B, two or more circular shields 48 'can be provided for the rectangular shield 49'. Further, the two cutter heads may be arranged vertically.

In this embodiment, a circular cross section is excavated after the child shield machine starts moving. In this child shield machine, the over cutter is appropriately expanded and contracted, and the skin plate is made rectangular or irregular. By doing so, a rectangular cross section or other irregular cross section can be excavated.

In the present embodiment, the spoke type cutter head has been described as an example, but the type of the cutter head may be a face plate type. However, when using the face plate type, it is necessary to cut out a part of the face plate in order to avoid interference between the face plates between adjacent cutter heads.

In the present embodiment, when the cutter head is swung by the swing mechanism, the extension side swing jack and the contraction side swing jack are driven synchronously. For example, only the extension side is operated. It is also possible to make another pair of jacks into a free state, for example. Further, the number of these swing jacks is not limited to four.

In the present embodiment, a muddy water shield has been described, but the present invention can also be applied to an earth pressure shield.

[Brief description of the drawings]

FIG. 1 is a front view (a view taken in the direction of arrow C in FIG. 3) of a variant parent-child shield machine according to one embodiment.

FIG. 2 is a diagram illustrating a cutter head driving mechanism (a cross-sectional view taken along line BB in FIG. 3) of the deformed parent-child shield excavator.

FIG. 3 is a vertical cross-sectional view (a cross-sectional view taken along line AA in FIG. 1) of the deformed parent-child shield machine.

FIG. 4A is a perspective view showing an aspect when the parent and child are integrally excavated, and FIG. 4B is a perspective view showing an aspect when the child shield machine is excavated alone.

FIG. 5 is a diagram illustrating a shape example of a rectangular cross section;

FIGS. 6 (a) and 6 (b) are diagrams showing examples of the arrangement of a circular shield with respect to a rectangular shield.

FIG. 7 is a diagram for explaining a mode of excavating a railway tunnel in a conventional example.

FIG. 8 is an explanatory view showing an example of a conventional tunnel machine for excavating a modified section.

FIG. 9 is an explanatory view showing another example of a conventional tunnel machine for excavating a modified cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deformed parent-child shield machine 2 Skin plate 3 Parent shield machine 4 Skin plate 5 Child shield machine 6 First cutter head 7 Second cutter head 9 Chamber section 13 Parent shield jack 14 Segment 17, 18, 19, 20 Spoke 23 Over cutter 27a, 27b, 27c, 27d Swing jack 28, 29, 30, 31 Spoke 34 Over cutter 35 Hydraulic motor 36 Frame part 37 Gutter part 38 Hood part 39 Guide cylinder 40 Spacer 41 Partition wall 42 Chamber part 47 Child shield jack

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsuji Ikezoe 1-1-5 Moto-Akasaka, Minato-ku, Tokyo Fujiin Building Kashima Construction Co., Ltd. Machinery Department (72) Inventor Norio Mitani 3-Ueno, Hirakata-shi, Osaka 1-1 Komatsu Ltd. Osaka factory (72) Inventor Takeshi Imamura 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka factory (56) References JP-A-10-77779 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/08

Claims (3)

(57) [Claims] 1. A variant in which a child shield machine is incorporated in a parent shield machine having a skin plate having a substantially rectangular cross section , and the parent shield machine and the child shield machine share at least a part of a cutter head and a cutter head driving unit. A parent-child shield machine, wherein the child shield machine is capable of independently digging a substantially rectangular cross section.
And means, wherein the flight of the parent shield machine has a plurality of excavation rectangular cross-section excavation means a substantially rectangular cross-section, these double
A substantially rectangular cross section as a whole by a number of rectangular cross section excavation means
And excavating the child shield machine
Cutting means, a plurality of rectangular section excavating means of the parent shield machine
And one or more of said parent shield machines
The excavation means of the rectangular cross section of
As well as when excavating the parent shield machine
A deformed parent-child shield excavator characterized in that they are driven so as not to interfere with each other . 2. The rectangular cross section excavating means has a plurality of over cutters which can be expanded and contracted in a radial direction of a cutter head.
2. The deformed parent-child shield excavator according to claim 1, wherein the excavator has a structure . 3. The cutter in said rectangular cross section excavating means.
The deformed parent-child shield excavator according to claim 2, wherein the pad is a spoke type .