JP3800680B2 - Multiple shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiple shield excavator having a plurality of rotating cutters.
[0002]
[Prior art]
The multiple-type shield machine has a plurality of rotating cutters on the front surface of the shield frame, and excavates a tunnel having a cross section in which a plurality of circles are connected by these rotating cutters. As this type of multiple shield machine, the one shown in FIGS. 6 and 7 is known.
[0003]
In this multiple shield machine, three rotary cutters b are arranged in mesh with each cutter pork c on the front surface of a cylindrical shield frame a formed in a peanut cross section. According to this configuration, the earth and sand of the face is excavated by each rotary cutter b and is once taken into the earth and sand taking-in chamber d after the rotary cutters b are synchronously rotated. Is transported to the inside of the machine.
[0004]
[Problems to be solved by the invention]
However, in the above-described multiple shield excavator, the cutter pork c of each rotary cutter b is meshed in the same plane, so that the face and the sand removal are between the circumferential directions of the cutter porks c. A space S communicating with the entrance room d is generated. For this reason, a self-supporting face is sufficient, but when the face is soft ground with high collapsibility, the sand of the face enters the earth and sand intake chamber d without being excavated by the cutter b through the space S. The face could not be held.
[0005]
An object of the present invention, which was created in view of the above circumstances, is to provide a multiple shield excavator capable of stably holding a face even on a soft ground having a high collapse property.
[0006]
[Means for Solving the Problems]
To accomplish the above object, the partition wall provided in the front part of the shield frame, a rotary cutter having a cutter face plate facing the working face spaced Te in the same plane plurality Rutotomoni, these rotating cutter a multiple-type shield machine a rocking cutter swings to avoid the rotation range of Oite the rotary cutter provided on the rotary cutter and the same plane during, in the partition wall, the swing cutter journaled an attached pivot shaft, the said pivot shaft, and is positioned between the swing cutter and the partition wall, fitted with a soil retaining plate for integrally swinging and the swing cutter, the The earth plate is formed so as to cover at least a portion between the rotary cutters inside the shield frame as viewed from the face side .
[0007]
According to the present invention, the earth and sand of the working face is excavated by the rotation of the rotary cutter and the swing of the swing cutter, and the earth plate provided on the swing face plate of each rotary cutter and the swing shaft of the swing cutter. And the earth is stopped. Therefore, even if it is a soft ground with a high collapsibility, the stable face can be held.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0009]
FIG. 1 and FIG. 2 show a front view and a plan sectional view of a muddy water type multiple shield excavator 1 according to this embodiment.
[0010]
As shown in the drawing, two rotary cutters 3 and 4 are arranged in the same plane at a predetermined interval L on the left and right sides of the front surface of the cylindrical shield frame 2 having a peanut-shaped cross section. Each of the rotary cutters 3 and 4 is used for a muddy water shield in which a slit 6 for taking earth and sand is opened in a disc-shaped cutter face plate 5 and a plurality of bits 7 are attached along the slit 6.
[0011]
On the back surface of the cutter face plate 5, as shown in FIG. 5, shutters 8 for adjusting the opening areas of the slits 6 are respectively provided via parallel links 9 and cylinders 10. Each shutter 8 controls the earth pressure water pressure of the face so as to keep the face stable by adjusting the opening area of the slit 6 to adjust the amount of soil taken up. Further, when the excavation is stopped, the slits 6 are completely closed as shown in FIG. 5B to prevent the face from collapsing.
[0012]
The rotary shafts 11 of the rotary cutters 3 and 4 pass through a partition wall 12 that divides the shield frame 2 into the face side and the inner side of the shaft, and are pivotally supported by the partition wall 12. A pinion 16 of a motor 15 attached to the partition wall 12 via a bracket 14 is engaged with the external gear 13 and is driven to rotate. In principle, the left and right rotary cutters 3 and 4 are rotated in reverse to each other in order to cancel the rotational reaction force.
[0013]
According to this configuration, when the left and right rotary cutters 3 and 4 are rotated by the motor 15, the earth and sand of the face is excavated by the bit 7, and the excavated earth and sand is taken into the cutter chamber 17 through the slit 6. The cutter chamber 17 is an earth and sand taking-in chamber defined by the partition wall 12, the cutter face plate 5, and the shield frame front end 2a. The earth and sand in the cutter chamber 17 is mixed with the mud supplied from the mud pipe 18 and becomes a reflux mud and discharged through the mud pipe 19.
[0014]
Between the left and right rotary cutters 3 and 4, a swing cutter 21 swings around the swing shaft 20 (in this embodiment, a swing angle of 20 degrees) while avoiding the rotation range of the rotary cutters 3 and 4. Is provided. The oscillating cutter 21 includes a front plate 22 in which two plates formed in a shamisen drum shape are connected back to back at an interval of 180 degrees across the oscillating shaft 20.
[0015]
The shape of the side surface portion 22 a of the front plate body 22 is formed in a concave arc shape that substantially matches the curvature of the cutter face plate 5 of the rotary cutters 3 and 4. Moreover, the shape of the end surface part 22b of the surface board body 22 is formed in the convex circular arc shape which covers the outer edge of the shield frame 2 seeing from the face side. In the front plate 22, four slits 23 for taking in earth and sand are opened radially about the swing shaft 20. These slits 23 are adjusted in opening area by the shutter 8 as shown in FIG. 5 provided on the back surface of the front plate 22.
[0016]
A plurality of bits 24 are attached to the front plate body 22 along the slits 23. As shown in FIG. 4, each bit 24 is attached with a phase shifted in the radial direction, and when the swinging cutter 21 swings, a different portion is excavated. The bit 24 of the swing cutter 21 is smaller than the bit 7 of the rotary cutters 3 and 4. This is because the oscillating cutter 21 only reciprocates in a circular arc shape within a range of 20 degrees, and therefore, the rotating cutters 3 and 4 are rotated 360 degrees to form a circular cutting path. This is because it is necessary to scrape little by little.
[0017]
Ribs 25 are provided on the rear surface of the front plate body 22 so as to partition the outer peripheral edge thereof, and a retaining plate 26 is attached to the ribs 25 and the swing shaft 20. The earth retaining plate 26 is configured by providing a relief plate 28 that avoids the rotating shaft 11 of the left and right rotating cutters on a circular plate 27 that has a slightly smaller diameter than the shield frame 2 with the swing shaft 20 as the center. It is formed in a shape that covers the swing region of the swing cutter 21 when viewed from the face side. In other words, the escape portion 28 remains hidden behind the cutter face plate 5 of the rotary cutters 3 and 4 when the retaining plate 26 swings.
[0018]
The earth retaining plate 26 receives the earth and sand of the face by the earth retaining plate 26 and prevents the earth and sand from directly entering the cutter chamber 17. If there is no retaining plate 26, the earth and sand of the face enters the cutter chamber 17 directly from between the side surface portion 22a of the swing cutter 21 and the side surface portion 29 of the rotary cutters 3 and 4 (swing region). End up. The earth and sand once entering the cutter chamber 17 cannot be excavated by the swinging and rotating cutters 3, 4, and 21, and may be fixed in the cutter chamber 17.
[0019]
On the other hand, when the retaining plate 26 is provided as in the present embodiment, the earth and sand of the face is separated from the retaining plate 26, the rib 25 of the side surface portion 22a of the swing cutter 21, and the side surface portion 29 of the rotary cutters 3 and 4. Is sandwiched in a space 31 (shaped like a crescent moon halved) partitioned by the ribs 30, and is rocked and crushed by the rocking cutter 21. Then, the crushed earth and sand go around to the face and pass through the slit 6 of the rotary cutters 3 and 4 and the slit 23 of the swinging cutter 21 and is sent into the cutter chamber 17.
[0020]
The retaining plate 26 is formed with an inlet (not shown) for guiding the earth and sand that has passed through the slit 23 of the front plate body 22 to the cutter chamber 17. The intake port of the retaining plate 26 exhibits a function of guiding excavated earth and sand taken into the swinging cutter 21 from the slit 23 of the front plate body 22 to the cutter chamber 17. In this way, the earth and sand taken into the cutter chamber 17 is mixed with the mud supplied from the mud pipe 18 as described above, and is discharged through the mud pipe 19 as reflux mud.
[0021]
Such excavation is achieved by swinging the swing shaft 20 of the swing cutter 21 and swinging the front plate body 22 and the earth plate 26 integrally. The swinging shaft 20 of the swinging cutter 21 is located in the middle of the straight line connecting the rotating shafts 11, 11 of the left and right rotating cutters 3, 4 and is pivotally supported by the partitioning wall 12 through the partitioning wall 12. . A cone body 33 having a bit 32 is provided at the end of the swing shaft 20 on the face side.
[0022]
On the other hand, as shown in FIG. 3, two oscillating arms 34 are provided in a straight line at an interval of 180 degrees on the inner part of the oscillating shaft 20. A telescopic rod portion 35 a of a swing jack 35 is connected to the tip end portion of each swing arm 34 via a pin 36. The cylinder portion 35 b of each swing jack 35 is supported by a bracket 37 attached to the partition wall 12 via a pin 38.
[0023]
These swing jacks 35 are connected to a controller (not shown) and extend and contract synchronously. The expansion / contraction stroke of the swinging jack 35 is set so that the front plate 22 of the swinging cutter 21 does not come into contact with the side surface 29 of the rotary cutters 3 and 4, and also serves as a stopper for the swinging cutter 21. Yes.
[0024]
The operation of the present embodiment having the above configuration will be described.
[0025]
When excavating the face, the motors 15 and 15 for the left and right rotary cutters 3 and 4 and the swinging jack 35 for the central swinging cutter 21 are operated. Then, the left and right rotating cutters 3 and 4 rotate (in principle, mutually reverse rotation) and the central swinging cutter 21 swings, and the face is excavated in the same plane.
[0026]
Here, the earth and sand of the face is stopped by the cutter face plates 5 and 5 of the respective rotary cutters 3 and 4 and a stop plate 26 provided on the swing shaft 20 of the swing cutter 21. Therefore, even if it is a soft ground with a high collapsibility, the stable face can be held. The earth pressure water pressure of the face can be freely controlled by the opening degree of the shutter 8 that opens and closes the slits 6 and 23 of the rotary cutters 3 and 4 and the swing cutter 21.
[0027]
That is, the earth and sand of the face is supported by the cutter face plates 5 and 5 of the rotary cutters 3 and 4, the front plate body 22 and the earth stop plate 26 of the swinging cutter 21, and the slits 6 and 23 of the cutters 3, 4 and 21. Therefore, the sealing performance between the face side and the cutter chamber 17 side is improved. Thereby, even if it is a soft ground with a high collapsibility, the stable face can be hold | maintained.
[0028]
Further, since the swing cutter 21 swings while avoiding the rotation areas of the left and right rotary cutters 3 and 4, there is no overlapping excavation area with the rotary cutters 3 and 4. Therefore, it is not necessary to equip an excessive excavation force, and the economy is improved.
[0029]
Further, since the cutters 3, 4, and 21 do not interfere with each other, all the cutters 3, 4, and 21 can be controlled independently. For example, even if the hardness of the left and right bedrocks is different, the excavation state of the face can be kept substantially constant by changing the rotational speed of the left and right rotary cutters 3 and 4, and the face can be held stably.
[0030]
In addition, the left and right rotary cutters 3, 4 can be adjusted by actively changing the rotational speeds of the left and right rotary cutters 3, 4, and the left and right rotary cutters 3, 4 can be made constant according to the rock hardness. It is also possible to change the rotation speed.
[0031]
【The invention's effect】
As described above, according to the multiple shield machine according to the present invention, the following excellent effects can be exhibited.
[0032]
(1) Since the earth and sand of the face can be earthed by the cutter face plate of each rotary cutter and the earth plate of the swinging cutter, the face can be stably held even on soft ground with high collapse.
[0033]
(2) Since there is no overlapping excavation area between the oscillating cutter and the rotating cutter, it is not necessary to equip an excessive excavation force, and the economy is improved.
[0034]
(3) Since each cutter does not interfere with each other, all the cutters can be controlled independently. Therefore, it is also possible to excavate a curve by actively changing the left and right rotational speed.
[Brief description of the drawings]
FIG. 1 is a front view of a multiple shield machine (muddy water type) showing an embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of the multiple shield machine.
FIG. 3 is a rear view of the multiple shield machine.
FIG. 4 is a diagram showing the trajectory of each bit when the swing cutter of the multiple shield machine is swung.
FIG. 5 is a view showing a shutter that opens and closes a slit formed in a cutter of the multiple shield machine.
FIG. 6 is a front view of a multi-shield shield machine showing a conventional example.
FIG. 7 is a plan sectional view of the multiple shield machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multiple type shield machine 3 Rotating cutter 4 Rotating cutter 5 Cutter face plate 20 Oscillating shaft 21 Oscillating cutter 26 Landing plate L Predetermined interval

Claims (1)

A partition wall provided in the front part of the shield frame, a rotary cutter having a cutter face plate facing the working face spaced Te in the same plane plurality Rutotomoni, speed range Oite the rotating cutter between these rotating cutter A multiple shield excavator provided with a swinging cutter that swings in the same plane as the rotating cutter ,
In the partition, and pivotally supports the pivot shaft of the swing cutter is attached, to the pivot shaft, and is positioned between the swing cutter and the partition wall, the swing cutter integrally with the rocking Attach a moving stop plate,
The multiple shield shield machine, wherein the earth plate is formed so as to cover at least a portion between the rotary cutters inside the shield frame as viewed from the face side .

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