JPH09250295A - Shield machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a shield machine capable of easily connecting a new tunnel to a side portion of an existing tunnel. SOLUTION: First and second cutter devices 7 and 8 having end mill type cutter blades are provided on an outer peripheral portion of a face plate 5 of a cutter head 4 rotatably provided at a front part of a shield body 2 and on the face plate 5. In addition, the cutter blades of the cutter devices 7 and 8 are provided so as to be able to move forward and backward from the face plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine capable of connecting a new tunnel to the side wall of an already constructed tunnel.

[0002]

2. Description of the Related Art Conventionally, an auxiliary construction method has been used in the case of joining a new tunnel having a diameter smaller than that of an existing tunnel constructed by a shield excavator in the ground without providing an intermediate pit. Was introduced.

That is, the shield machine that has been excavated is stopped at a position before the segment that constitutes the existing tunnel, and the ground portion around it is hardened by chemical injection or freezing, and then the face of the face is cut. Utilizing pressure
The worker went out of the shield body and, using an excavating tool such as a breaker, destroyed the concrete portion of the reinforced concrete segment and formed an opening for fusing the rebar and connecting the tunnel.

It is also possible to directly press the cutter head of the shield machine against an existing segment to make a hole in the segment. However, in a normal cutter bit attached to the cutter head, the cutter bit itself is damaged. There is also a drawback that the tunnel itself is adversely affected when the shield machine is pressed against the segment using a special roller bit.

[0005]

As described above, when attempting to crush a segment manually by using the auxiliary construction method, the construction period inevitably becomes long, the cost becomes high, and the work is performed outside the shield body. There is also the problem of danger.

Therefore, an object of the present invention is to provide a shield machine capable of easily connecting a new tunnel to a side portion of an existing tunnel.

[0007]

In order to solve the above-mentioned problems, a shield machine according to the present invention is an end mill type machine on the outer peripheral portion of a face plate of a cutter head rotatably provided on the front part of a shield body and on the face plate. First with a cutter blade
And a second cutter device.

In the shield machine, the first
The cutter device includes a tubular moving body movably arranged in a tubular guide portion provided on an outer peripheral portion of a face plate of the cutter head, and a rotatably inserted into the tubular moving body via a bearing member. A cutter shaft body having a cutter blade formed at one end, a retracting device connected to the other end of the cutter shaft for retracting the cutter shaft, and a cutter plate provided on the face plate side, A rotary drive device that rotates via a transmission mechanism, and a second cutter device is provided on the face plate side, and a movable body movably arranged in a groove formed in the face plate of the cutter head in a radial direction. A moving device for moving the moving body, a cylindrical guide body movably arranged in a cylindrical guide portion provided on the front wall portion of the moving body, and a bearing member for the cylindrical guide body. And rotatably inserted, and at one end A cutter shaft body having a cutter blade formed thereon, and a retracting device which is provided on the moving body side and is connected to the other end of the cutter shaft body to move the cutter shaft body back and forth, and which is provided on the face plate side. And a rotation driving device that rotates the cutter shaft through a transmission mechanism.

According to the above construction, the first cutter device having the end mill type cutter blade which can be retracted from the face plate of the cutter head is provided at the outer peripheral portion of the cutter head and the second cutter device having the same cutter blade. Since the is placed on the face plate, it is possible to easily make a hole in the segment made of reinforced concrete that constitutes the existing tunnel.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A shield machine according to a first embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 denotes a shield machine for connecting a new tunnel having a diameter smaller than that of the existing tunnel to a side portion of the existing tunnel constructed by a segment made of reinforced concrete. 2, a cutter head 4 rotatably supported via a slewing bearing 3, and a rotary driving device (for example, a hydraulic motor or the like) disposed inside the shield body 2 to rotate the cutter head 4. The first and second cutter devices 7, 8 having an end mill type cutter blade provided on the outer peripheral portion of the face plate 5 and the face plate 5 are further provided in the cutter head 4. It is arranged. In addition, 4a shows a cutter bit.

As shown in FIGS. 3 to 5, the first cutter device 7 is located at a predetermined position on the outer peripheral portion of the cutter head 4 at a position close to the outer periphery in the storage chamber 12 of the box body 11 and obliquely outside. Cylindrical guide body (cylindrical guide portion) 13 arranged in one direction
And a tubular moving body 14 provided on the tubular guide body 13 so as to be movable in the axial direction thereof, and the tubular moving body 14
In addition, an intermediate shaft portion 16b is rotatably supported via a bearing member 15, and a cutter shaft body 16 having an end mill type cutter blade 16a formed at an outer tip end, and an inner side of the cutter shaft body 16 The driven gear 17 fixed to the base end side of the bearing and the base end portion of the cutter shaft body 16 are attached to the bearing member 1
A holding body 19 which is rotatably held via 8 and a cylinder device for moving in and out which is arranged in the storage chamber 12 and moves the cutter shaft body 16 outward and backward through the holding body 19 ( An example of a retractable device is a hydraulic motor (for example, a hydraulic cylinder is used) 20, and a drive motor (rotation motor) in which a drive gear 21 arranged in the storage chamber 12 and meshing with the driven gear 17 is attached to an output shaft. It is an example of a drive device, and for example, a hydraulic motor, an electric motor or the like is used) 22. The driven side gear 17 and the drive side gear 17,
A transmission mechanism is configured by 21.

Therefore, the drive motor 22 is driven to rotate the cutter shaft body 16 via both gears 17 and 21, and the retracting cylinder device 20 is driven to drive the cutter shaft body 16 forward obliquely outward. If it is made to protrude, the end mill type cutter blade 16a can perform a predetermined excavation work, that is, breakage of a reinforcing bar or the like.

The thickness of the drive-side gear 21 is made thicker than the thickness of the driven-side gear 17 by the amount of movement (movement) of the cutter shaft body 16, and therefore the cutter shaft body 16 is made thicker.
It is considered that the gears 17 and 21 can mesh with each other even when the gear moves in and out.

Further, a cylindrical protection member (protection ring) 23 for protecting the cutter blade 16a when the cutter blade 16a is not used is provided on the front end surface of the cylindrical guide body 13.

Next, the second cutter device 8 arranged on the face plate 5 of the cutter head 4 will be described. The second cutter device 8 has one cutter blade (8A),
There are two types, one with two cutters (8B), and the one with one cutter blade (8A) will be described first.

That is, the second cutter device 8A is shown in FIGS.
As shown in FIG. 8, a moving body 31 is arranged on the face plate 5 of the cutter head 4 so as to be movable in a groove portion 5a formed in the radial direction, and a moving body 3 also arranged on the face plate 5 side.
A moving cylinder device 32 for moving 1 (a hydraulic device is an example of a moving device, for example, a hydraulic cylinder is used) 32, and it is arranged inside the face plate 5 and presses the side surface of the moving body 31 to fix its movement. The fixing device, for example, the cylinder device 33, and the tubular guide body (cylindrical guide portion) 3 provided on the front wall portion side of the storage chamber 34 formed in the moving body 31.
A cylindrical moving body 3 that is arranged inside the movable body 5 so as to be movable in the front-back direction.
6 and a cutter shaft body 38 in which the intermediate shaft portion 38b is rotatably supported by the tubular moving body 36 via a bearing member 37 and an end mill type cutter blade 38a is formed at the outer end portion thereof. A driven gear 39 fixed to the inner proximal end of the cutter shaft 38, and a holder 41 for rotatably holding the proximal end of the cutter shaft 38 via a bearing member 40, A retractable cylinder device (an example of a retractable device, for example, a hydraulic cylinder is used, which is disposed in the storage chamber 34 and moves the cutter shaft body 38 outward and backward through the holder 41. ) 42 and the storage chamber 3
And a drive motor (which is an example of a rotary drive device, for example, a hydraulic motor, an electric motor or the like is used) 44 having a drive side gear 43 arranged in 4 and meshing with the driven side gear 39 is attached to the output shaft. Has been done. Of course, also in the second cutter device 8A, even if the cutter shaft body 38 moves back and forth, the two gears (these gears form a transmission mechanism) 39, 43 are prevented from being disengaged from each other. ing.

The cylinder body 32a of the moving cylinder device 32 is connected to the moving body 31 side, and the rod part 32b is connected to the cutter head 4 side (of course, the mounting method may be reversed. Also, a pair of the moving cylinder devices 32 are arranged on both sides of the moving body 31, and further, the fixing cylinder device 3 is provided.
3 are arranged one by one at the left and right positions of the groove portion 5a, and press and fix both side portions of the moving body 31.

Therefore, the drive motor 44 is driven to rotate the cutter shaft 38 via both gears 39 and 43, and the retracting cylinder device 42 is driven to project the cutter shaft 38 forward. Then, this end mill type cutter blade 38a can perform a predetermined excavation work, that is, a steel member such as a reinforcing bar.

As with the first cutter device 7, when the cutter blade 38a is not used on the surface of the cylindrical guide body 35,
A cylindrical protection member (protection ring) 45 that protects the cutter blade 38a is provided.

Next, the second cutter device 8 (8B) provided with two cutter shafts 38 will be schematically described. The second cutter device 8B has a drive motor 44 as shown in FIG. On both sides of the cutter shaft 38 (38A, 38A
B) is arranged, and the driven gear 43 is meshed with the driven gear 39 (39A, 39B) provided on both cutter shafts 38 (38A, 38B).

Therefore, when the drive motor 44 is rotated, the two cutter shaft bodies 38 (38A, 38B) are rotated, and the respective cutter blades 38a are rotated. In the above configuration, when the shield machine 1 approaches close to the segment of the tunnel to be connected, its speed is first reduced, and then the drive motors 22 and 44 of the cutter devices 7 and 8 (8A and 8B) and the exit and exit cylinders. Device 20, 42
Is driven to rotate the cutter shaft bodies 16 and 38, project the cutter blades 16a and 38a forward, and slowly move the shield body 2 forward. At this time, in the second cutter device 8, the moving cylinder device 32 is driven, and each moving body 31 is moved in the radial direction. With this operation, the entire face plate 5 can be moved.

Therefore, the concrete portion of the existing tunnel segment is cut by the cutter bits 4a provided on the face plate 5 and the rebar in the concrete is cut by the end mill type cutter blades 16a, 38a.

That is, a new tunnel can be connected to an existing tunnel easily and in a short time only by the shield machine without using (combining) the auxiliary method as in the conventional case.

The cutter blades 16a and 38a in each of the cutter devices 7 and 8 are protected from wear by retracting into the protective members 23 and 45 at the time of excavation with the normal cutter bit 4a. Of course, this protection member 23,
The front end surface of 45 is set to a height that is located rearward of the excavation surface of the normal cutter bit 4a.

In the above embodiment, the case where the tunnel is connected to the side of the tunnel has been described. However, for example, when a steel material such as a reinforcing bar is buried in the ground during normal excavation. By using the cutter devices 7 and 8 described above, it is possible to easily break the buried steel member and continue the excavation.

[0027]

As described above, according to the structure of the present invention, the first cutter device having the end mill type cutter blade that can be freely retracted and retracted from the face plate of the cutter head is provided on the outer peripheral portion of the cutter head and the same. Since the second cutter device having the cutter blade is arranged on the face plate, it is possible to make a hole in the segment made of reinforced concrete which constitutes the existing tunnel, and therefore, easily and in a short time on the side wall portion of the existing tunnel. , Can connect a new tunnel.

Of course, even during normal excavation,
Even when a steel member such as a reinforcing bar is buried, the buried steel member can be easily broken to continue excavation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of the shield machine.

FIG. 3 is a cross-sectional view showing a configuration of a first cutter device in the shield machine.

FIG. 4 is a view as viewed in the direction of arrows AA in FIG. 3;

FIG. 5 is a view taken in the direction of arrows BB in FIG. 3;

FIG. 6 is a cross-sectional view showing a configuration of a second cutter device in the shield machine.

FIG. 7 is a view taken in the direction of the arrows CC in FIG. 6;

FIG. 8 is a view taken along the line DD of FIG.

FIG. 9 is a cross-sectional view showing a configuration of another second cutter device in the shield machine.

[Explanation of symbols]

 1 shield machine 2 shield body 4 cutter head 5 face plate 7 first cutter device 8 second cutter device 12 storage chamber 13 tubular guide body 14 tubular moving body 16 cutter shaft body 16a cutter blade 17 driven side gear 20 for exiting / retracting Cylinder device 21 Drive side gear 22 Drive motor 31 Moving body 32 Moving cylinder device 34 Storage chamber 35 Cylindrical guide body 36 Cylindrical moving body 38 Cutter shaft body 38a Cutter blade 39 Driven side gear 42 Entry / exit cylinder device 43 Drive side Gear 44 drive motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Inada 2-8, Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. No. 28 Hitachi Shipbuilding Co., Ltd. (72) Inventor Hidenobu Tanimura 5-3-3 Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (3)

[Claims] 1. A first and a second cutter device having end mill type cutter blades are provided on an outer peripheral portion of a face plate of a cutter head rotatably provided at a front part of a shield body and the face plate. A shield machine that does. 2. A first cutter device, a tubular moving body movably arranged in a tubular guide portion provided on an outer peripheral portion of a face plate of a cutter head, and a bearing member for the tubular moving body. A cutter shaft that is rotatably inserted and has a cutter blade formed at one end, a retracting device that is connected to the other end of the cutter shaft to move the cutter shaft back and forth, and a face plate are provided. And a rotation drive device for rotating the cutter shaft via a transmission mechanism.
The listed shield machine. 3. A second cutter device, a movable body movably arranged in a groove formed in a face plate of a cutter head in a radial direction, and a movable device provided on the face plate side for moving the movable body. A tubular guide body movably arranged in a tubular guide portion provided on the front wall portion of the moving body, and rotatably inserted into the tubular guide body via a bearing member and at one end thereof. A cutter shaft formed with a cutter blade, and a retracting device that is provided on the moving body side and that is connected to the other end of the cutter shaft to retract the cutter shaft, and that is provided on the face plate side. The shield machine according to claim 1 or 2, comprising a rotary drive device that rotates the cutter shaft via a transmission mechanism.