JP3758737B2 - Method for holding a perfect circle of a segment by a perfect circle holding device of a tunnel machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for maintaining a perfect circle of a segment by a device for maintaining the roundness of a segment assembled in a tunnel machine, and in particular, the trueness of a tunnel machine having a simplified structure and improved operability. The present invention relates to a method for holding a perfect circle of a segment by a circle holding device.
[0002]
[Prior art]
The first prior art will be described with reference to FIG.
FIG. 4 is a view showing a vertically extending perfect circle holding device 50 corresponding to FIGS. 2 and 3 showing an embodiment of the tunnel excavator according to the present invention. In the rear of the shield excavator 1, earth pressure and hydraulic load are shown. In order to prevent the segment 20 from being crushed and deformed, the extension jack 55 is extended and the upper and lower shoes 28 and 29 support the segment 20.
The perfect circle holding device 50 includes a wheel 27 attached to a connection guide 54 of the perfect circle holding device 50 on the rail 26 installed in the longitudinal direction of the tunnel on the support frame 16 fixed to the overhanging deck 14 of the shield machine 1. It is supported by the shield machine 1 in a state of being hung through. .
[0003]
During excavation and segment assembly, the upper and lower shoes 28 and 29 are pressed against the inner peripheral wall of the segment 20 by the extension jack 55, and the segment 20 is fixed to the segment 20 in order to support it vertically.
Therefore, the shield excavator 1 and the overhanging deck 14 attached thereto advance while the perfect circle holding device 50 is fixed to the segment 20 during excavation.
When the shield machine 1 completes the assembly of one segment of the ring, the upper and lower shoes 28 and 29 are once contracted, and the perfect circle holding device 50 is again suspended from the overhanging deck 14. When the movable jack 17 is contracted in this state, the wheel 27 attached to the connection guide 54 of the perfect circle holding device 50 rolls on the rail 26, and the perfect circle holding device 50 is pulled forward, and then extended on the spot. The upper and lower shoes 28, 29 are pressed against the inner peripheral wall of the segment 20 by 55 and re-fixed to the segment 20.
The movable jack 17 connects the overhanging deck 14 and the perfect circle holding device 50. However, during the excavation, the oil in the movable jack 17 freely flows so that the shield excavator 1 and the overhanging deck 14 are in a so-called float state. It is stretched naturally as it progresses forward.
[0004]
On the other hand, during the excavation, the shield excavator 1 and the overhanging deck 14 move relatively freely in the vertical and horizontal directions with respect to the segment 20, and are thus fixed to the wheels 27 of the perfect circle holding device 50 and the overhanging deck 14. The upper and lower shoes 28 and 29 are connected to the upper rod 51 and the lower rod via pins 30 so that the rail 26 can move relatively freely with a certain amount, and the wheel 27 and the rail 26 are not detached. The upper and lower rods 51 and 52 are connected to each other by an extension jack 55 stored therein.
The upper and lower rods 51 and 52 are further inserted into a connection guide 54 via a bush 53, and two left and right moving wheels 27 and a lifting prevention member 31 are attached to the connection guide 54. With this structure, the upper and lower shoes 28, 29 are pressed against the inner peripheral wall of the segment 20 by the extension jack 55, and the upper / lower shoes 28, 29 to the upper and lower rods 51, 52 to the extension jack 55 are integrally fixed to the segment 20. However, the connection guide 54 can move up and down via the bush 53. That is, even if the overhanging deck 14 fixed to the shield machine 1 moves up and down with respect to the perfect circle holding device 50 with the excavation, the connection guide 54 can absorb the movement.
Similarly, even if the support frame 16 fixed to the overhanging deck 14 moves left and right, the width of the wheel 27 is sufficiently wide with respect to the rail width 26, so that the left and right movement can be absorbed within this wheel width. ing.
Even if the support frame 16 fixed to the overhanging deck 14 moves forward, down, left, and right as it advances, while the perfect circle holding device 50 is fixed to the segment 20 by the above structure, it is in a floating state. The movement of the support frame 16 fixed to the overhanging deck 14 can be absorbed by the play of the connecting guide 54 and the wheels 27.
[0005]
As a second prior art, “JP-A-61-76899” shown in FIG. 5 will be described.
Guide rails 84 are installed on both sides of the upper surface of the rear deck 74, and a support frame 78 is provided above the guide rails 84 so as to protrude from the guide pipe 89 of the stay 75. A segment generated during excavation is provided on the support frame 78. A roller 86 having a tread surface width larger than the maximum eccentric amount at the center of the radius of curvature of the ring 73 and the spreaders 76 and 77 is connected to the guide rail 84 via a stay 75 and a lifting jack 81 and a rod 82. 77 of the segment ring 73 which is installed so as to be able to support and roll and has a stroke equivalent to the width of the tread surface of the roller 86 in parallel with the axis of the roller 86 between the support frame 78 and the rear deck 74. A perfect circle holding device is described.
[0006]
As the third prior art, “Actual Heisei 3-25699” shown in FIG. 6 will be described.
A pair of left and right guide rails 94 parallel to each other are provided on the rear work table 91 of the shield main body 92 in the front-rear direction, and a carriage 96 that can reciprocate is provided on each of the guide rails 94. A support column 97 provided with a telescopic jack device 99 is erected, the segment pressing member 101 is supported through the horizontal pin 102 in the front-rear direction over the operating end of the jack device 99, and both the support beam beams 94 are vertically centered. A device for holding a perfect circle of a segment in a shield machine that is pivotably connected around is described.
[0007]
[Problems to be solved by the invention]
However, the first and second conventional techniques have the following problems.
(1) Since a float structure is used, a large number of parts such as the upper and lower rods 51 and 52, the bush 53, and the connection guide 54 are required, and the structure is complicated and expensive. The same applies to the second prior art.
(2) When the extension jack 55 is expanded and contracted, it starts to move from the upper and lower shoes 28 and 29 having the lighter resistance, and the positions of the upper and lower shoes 28 and 29 cannot be controlled.
For example, normally, when expanding, the upper shoe 28 starts to move from the lower shoe 29 due to gravity, and after the lower shoe 29 hits the segment 20, the upper shoe 28 extends. Therefore, it is not possible to extend only the upper shoe 28 and apply it to the segment while the lower shoe 29 is contracted. The same applies to the second prior art.
[0008]
The third prior art has the following problems.
The column 97 having the jack device 99 that can be expanded and contracted upward is erected on the carriage 96, and the segment pressing member 101 is supported through the horizontal pin 102 in the front-rear direction across the operating end of the jack device 99. When the overhanging deck 14 fixed to the shield body 92 moves forward while moving up and down as the member 101 is fixed to the segment 20, the column 97 provided with the jack device 99 is moved to the carriage 96. On the other hand, since it is not in a float state, the movement of the overhanging deck 14 cannot be absorbed. For this reason, since the jack device 99 cannot follow the vertical movement of the overhanging deck 14, the holding force of the perfect circle holding device pressing the segment varies. Along with this, the true circle accuracy of the segment also decreases. This is because the roundness accuracy is determined by a predetermined holding force of the perfect circle holding device, and the roundness is deviated when it fluctuates from the predetermined holding force.
[0009]
[Means for solving the problems and actions / effects]
The present invention has been made to solve the above-described problems of the prior art, and a method for retaining a perfect circle of a segment by a true circle holding device of a tunnel excavator according to a first invention is provided for pressing against an inner peripheral surface of a segment. and a shoe provided with a two pistons in one cylinder tube, and stretching jack coupled to the shoe to the rod end of the two pistons, and rotatably mounted wheel to the cylinder tube of the expansion jack, tunnel It is placed on the overhanging deck excavator, and a rail in which the wheels roll, the piston upper the extension jack is extended upward, and a lower piston extending downward, the bottom chamber of the upper and lower piston Tunnel drilling using a perfect circle holding device consisting of an oil supply port A to the upper piston, an oil supply port B to the rod chamber of the upper piston, and an oil supply port C to the rod chamber of the lower piston When drilling the machine or assembling the segment, open the filler port B and the filler port C, feed oil to the filler port A, extend the upper and lower pistons, and press the upper and lower shoes against the inner surface of the segment. The hydraulic circuit of the port B and the oil supply port C are connected to float the cylinder tube, and after the tunnel excavator completes the assembly for one segment of the ring, the upper and lower pistons are contracted.
[0014]
According to the first invention, since circularity holding device is floating against the overhanging deck, sometimes shield machine is boring, overhanging deck is fixed in the shield machine is in the vertical direction Even if it moves, the holding force of the perfect circle holding device that presses the segment does not fluctuate and is constant, so that the perfect circle holding accuracy of the segment can be held in a good state.
[0015]
A method for holding a perfect circle of a segment by a true circle holding device for a tunnel machine according to a second aspect of the present invention includes a shoe for pressing against an inner peripheral surface of a segment, two pistons in one cylinder tube, An extension jack in which the shoe is connected to the rod ends of two pistons, a wheel rotatably mounted on a cylinder tube of the extension jack, and a rail on which the wheel rolls on an overhanging deck of a tunnel machine It has the door, and a piston on the extension jack is extended upward, and a lower piston extending downward, and the fuel supply port a to the bottom chamber of the upper and lower pistons, and oil supply port B to the rod chamber above the piston , using a true circle holding device comprising a fuel supply port C to the rod chamber of the lower piston, during excavation at or segment assembly of tunnel excavator sends pressure oil to the oil supply port a The first method for allowing the oil supply port B and the oil supply port C to freely release the pressure oil, the pressure oil is sent to the oil supply port A, and the oil supply port B allows the pressure oil to freely extract and block the oil supply port C. the second method or blocked fuel supply port a,, the fuel supply port B is so pressurized oil escapes freely, by any of the third method of the oil feeding pressure oil to the oil supply port C, it is extended over the piston pressing the upper segment by the upper shoe Te, after the tunnel excavator has completed the assembly of the segments 1 ring component sends pressure oil to the oil supply port B, remove the hydraulic fluid from at least one of the fuel supply port a fuel supply port C The upper piston is contracted.
[0016]
According to the second invention, when the excavation time or segment assembly of tunnel boring machines, segments are easily crushed down by its own weight, the feed pressure oil to the fuel supply port A in this case, the fuel supply port B and the fuel supply port C is a first method for allowing the pressure oil to freely come out, a second method for sending the pressure oil to the oil supply port A, and a oil supply port B for allowing the pressure oil to freely come out and blocking the oil supply port C, or the fuel supply port a blocked, fuel supply port B is so pressurized oil escapes freely, by any of the third method of the oil feeding pressure oil to the oil supply port C, more upwards on the shoe by extending the upper piston Press the segment. The climbing speed of the upper shoe is in the order of (first method) <(second method) <(third method), but this may be selected as necessary. After the tunnel excavator has completed the assembly of the segments 1 ring component sends pressure oil to the oil supply port B, the upper shoe upper piston to contract exits hydraulic oil from at least one of the fuel supply port A fuel supply port C Move away from the upper segment.
[0017]
Therefore when only the holding circularity upper segment may constitute a perfect circle holding device by simple modification of removing only the lower shoe roundness holding device. Thus space disconnect the lower shoe roundness holding device, it is possible to use as a transporting space segment or the like can be used when the child shield in parent shield machine.
[0018]
A method for holding a perfect circle of a segment by a true circle holding device for a tunnel machine according to a third aspect of the present invention includes a shoe for pressing against the inner peripheral surface of a segment, two pistons in one cylinder tube, An extension jack in which the shoe is connected to the rod ends of two pistons, a wheel rotatably mounted on a cylinder tube of the extension jack, and a rail on which the wheel rolls on an overhanging deck of a tunnel machine It has the door, and a piston on the extension jack is extended upward, and a lower piston extending downward, and the fuel supply port a to the bottom chamber of the upper and lower pistons, and oil supply port B to the rod chamber above the piston , using a true circle holding device comprising a fuel supply port C to the rod chamber of the lower piston, during excavation at or segment assembly of tunnel excavator blocks the fuel supply port B The fuel supply port C is opened, after pressing the lower shoe segment extends below the piston with the oil feed to the fuel supply port A, to block the fuel supply port C, opens the fuel supply port B, oil feed to the fuel supply port A after pressing the upper shoe segment extends over piston and the fuel supply port a blocked, after reversing the order in which the pressing or for positioning the circularity holding device, or the on-bottom shoe segments the fuel supply port a block, after positioning the circularity holding device, communicates the hydraulic circuit of the fuel supply port B and the fuel supply port C, float the cylinder tube, assembled tunnel boring machine segment 1 ring min after completing the in the fuel supply port a is opened, it is characterized in that contracting the upper and lower pistons in the oil feed to the fuel supply port B and the fuel supply port C.
[0019]
According to the third aspect of the invention, the oil filler B is blocked, the oil filler C is opened, the oil is supplied to the oil filler A, the lower piston is extended and the lower shoe is pressed against the segment, and then the oil filler C is blocked. When the oil supply port B is opened and the oil supply port A is supplied with oil, the upper piston is extended and the upper shoe is pressed against the segment, and then the oil supply port A is blocked and the perfect circle holding device is positioned. Alternatively, after reversing the order in which the upper and lower shoes are pressed against the segments, the filler port A is blocked and the perfect circle holding device is positioned. After this positioning, the hydraulic circuit of the oil filler B and the oil filler C is communicated to float the cylinder tube. Therefore, it is easy positioning by operating simultaneously the positions of the segment and the circularity holding device at the inflection point of the curve-vertical slope.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a perfect circle holding device for a tunnel excavator according to the present invention will be described in detail below with reference to FIGS.
FIG. 1 is a cross-sectional side view of an entire tunnel excavator in which each embodiment of a perfect circle holding device for a tunnel excavator according to the present invention is installed, and FIG. 2 is a diagram showing a first embodiment of the perfect circle retainer according to the present invention. FIG. 3 is a view showing a second embodiment of the perfect circle holding device according to the present invention.
In addition, the same code | symbol is attached | subjected to components common with a prior art, and the description is abbreviate | omitted.
[0021]
In FIG. 1, the tunnel excavator 1 includes a front cylinder 2 and a rear cylinder 3, and an articulated jack 4 is mounted between the front cylinder 2 and the rear cylinder 3. A cutter head support ring 7 that rotatably supports a cutter head 6 to which a cutter bit 5 is fixed is fixed to the front portion of the front cylinder 2. The cutter head support ring 7 is used for rotationally driving the cutter head 6. The cutter drive motor 8 is fixed.
A skin plate 9 is fixed to the outer periphery of the front cylinder 2 up to the back of the cutter head 6, and a chamber 11 is formed inside the skin plate 9 by a partition wall 10 fixed to the front cylinder 2 and the cutter head 6. Yes.
[0022]
Further, a ring girder 12 is fixed to the front inner peripheral surface of the rear barrel 3, and a column 13 is fixed to the inner side in the radial direction of the ring gutter 12 in the vertical and horizontal directions. A deck 14 is fixed, and a support frame 16 is fixed to the overhanging deck 14 to support the perfect circle holding device 15 so as to be movable in the front-rear direction. A movable jack 17 is mounted on the perfect circle holding device 15 and the column 13 by a universal joint.
A swiveling ring 18 is rotatably mounted on the ring gutter 12 behind the support column 13 by a guide roller 19. The swiveling ring 18 extends rearward and assembles a segment 20 for covering the shield tunnel. A segment erector 21 is attached.
A shield jack 22 is attached to the front portion of the rear trunk 3, and the piston rod is extended at the tip of the piston rod of the shield jack 22, so that the tunnel digging machine 1 is grounded by taking a reaction force from the segment 20. A spreader 24 for excavating the mountain 23 is mounted.
[0023]
The operation of the configuration of FIG. 1 will be described.
The tunnel excavator 1 extends a shield jack 22 fixed to the rear trunk 3, and the spreader 24 attached to the piston rod of the shield jack 22 takes a reaction force from the segment 20 to propel the tunnel excavator 1. , The cutter head 6 rotatably supported by the cutter head support ring 7 is rotated, the ground bit 23 is excavated by the cutter bit 5 fixed to the front surface of the cutter head 6, and the tunnel excavator 1 is moved inside the natural ground 23. Dig into. When direction correction is required during tunnel excavation, the tunnel excavator 1 is excavated in the ground 23 while correcting the direction by the shield jack excavation pattern or the articulated jack 4, and the tunnel excavator 1 is brought into a predetermined position. When reaching, stop tunneling.
[0024]
As described above, the segment 20 gripped by the segment erector 21 is swung on the tunnel wall of the natural ground 23 excavated by the tunnel excavating machine 1 to the assembly position by swiveling the swivel ring 18 and is covered.
The lined segment 20 is prevented from being deformed by earth pressure / water pressure or its own weight by the perfect circle holding device 15.
[0025]
The structure of FIG. 2 which shows the AA cross section of FIG. 1 is demonstrated.
The extension jack 25 includes a pair of upper and lower pistons 33 and 34, upper and lower piston rods 33a and 34a, an oil supply port A to the bottom chamber of the upper and lower pistons 33 and 34, and an oil supply to the rod chamber of the upper piston 33. It consists of a port B and an oil supply port C to the rod chamber of the lower piston 34. Each of the bottom chambers of the upper and lower pistons 33, 34, the rod chamber of the upper piston 33, and the rod chamber of the lower piston 34 is provided by known valves. The upper and lower shoes 28 and 29 connected to the tips of the upper and lower piston rods 33a and 34a are moved up and down by supplying pressure oil or withdrawing hydraulic oil from each chamber.
A moving wheel 27 is rotatably mounted on the extension cylinder 25, and a rail 26 for rolling the moving wheel 27 is fixed to the support frame 16 fixed to the overhanging deck 14 in the longitudinal direction of the tunnel. ing.
An anti-lifting material 31 is fixed to a portion of the extension jig 25 located below the flange portion for the support frame 16.
[0026]
The operation of FIG. 2 will be described.
When extending the expansion jig 25, pressure oil is sent to the oil supply port A to the bottom chamber of the upper and lower pistons 33, 34, and the oil supply port B to the rod chamber of the upper piston 33 and the oil supply to the rod chamber of the lower piston 34 are supplied. The mouth C moves the shoes 28 and 29 up or down by allowing the pressure oil to come out freely.
As another method, oil is sealed in the oil supply port B to the rod chamber of the upper piston 33 and locked, pressure oil is sent to the oil supply port A to the bottom chamber of the upper and lower pistons 33 and 34, and the rod chamber of the lower piston 34 is supplied. When the pressure oil is allowed to come out freely, the lower shoe 29 moves and contacts the inner peripheral wall of the segment 20.
Next, on the contrary, the oil supply port C to the rod chamber of the lower piston 34 is locked, and the pressure oil can freely escape through the oil supply port B to the rod chamber of the upper piston 33 to the bottom chamber of the upper and lower pistons 33, 34. When the pressure oil is sent to the oil filler port A, the upper shoe 28 moves and comes into contact with the inner peripheral wall of the segment 20 and is in a state of being stretched up and down.
[0027]
In order to make the cylinder tube 32 and the wheel 27 float freely up and down and left and right during excavation, the oil in the filler port A is filled and locked, and the hydraulic circuits in the filler port B and the filler port C are connected. If pressure oil is allowed to freely enter and exit, the cylinder tube 32 and the wheel 27 are floated up and down while maintaining the vertical extension. Since the wheel 27 has a sufficient width with respect to the rail 26 as described above, the wheel 27 can also move left and right. When all the oil in each chamber of the oil filler port A, the oil filler port B, and the fuel filler port C is locked, the upper and lower shoes 28 and 29, the cylinder tube 32, etc. are all fixed in the vertical direction. When the shoes 28 and 29 are contracted, when the pressure oil is sent to the oil supply port B and the oil supply port C and the pressure oil is released from the oil supply port A, the upper and lower shoes 28 and 29 move in the contracting direction. As in the case of expansion, when the filler port A is opened, either the filler port B or the filler port C is blocked and pressure oil is sent to the remaining filler port B or filler port C, the upper and lower shoes 28 and 29 are individually connected. It can be shortened. By the above operation, the upper and lower shoes 28 and 29 can be stopped and locked at arbitrary positions.
[0028]
3 which shows another structure of the AA cross section in FIG. 1 is demonstrated.
Since it is the same as that of FIG. 2 except having removed the lower shoe 29 from the perfect circle holding | maintenance apparatus 15 shown in FIG. 2, description is abbreviate | omitted.
[0029]
The operation of FIG. 3 will be described.
The segment 20 is easily pushed downward by its own weight. In this case, the perfect circle holding device 15a of this embodiment is configured by a simple change in which only the lower shoe 29 is removed from the true circle holding device 15 shown in FIG. Then, it is sufficient to perform the perfect circle holding operation by moving only the upper shoe 28 upward and bringing it into contact with the inner peripheral wall of the segment 20 so as to protrude upward. In this way, the space of the lower shoe 29 can be used as a carry-in space for the segment 20.
When the upper segment 20 is extended, pressure oil is sent to the oil filler port A, and the oil filler port B and the oil filler port C send pressure oil to the oil filler port A in a first method that allows the oil to be freely released. The port B allows the pressure oil to come out freely, the second method of blocking the oil supply port C, and the oil supply port A is blocked. The oil supply port B allows the pressure oil to come out freely, and the oil supply port C is pressurized. The upward speed of the upper shoe 28 is in the order of (first method) <(second method) <(third method). To select.
In the present embodiment, the cylinder tube 32 and the wheel 27 cannot be floated up and down freely during excavation, but the float state in which the cylinder tube 32 and the wheel 27 can freely move left and right is the same as in the first embodiment. Therefore, explanation is omitted.
When the upper shoe 28 is contracted, pressure oil is sent to B, and if the hydraulic oil is removed from at least one of A and C, the upper shoe 28 moves in the contracting direction.
[Brief description of the drawings]
FIG. 1 is an overall sectional side view of a tunnel machine according to the present invention.
2 is a cross-sectional view taken along the line AA in FIG. 1, and is a view showing a first embodiment of a perfect circle holding device according to the present invention. FIG.
3 is a cross-sectional view taken along the line AA of FIG. 1, and is a view showing a second embodiment of the perfect circle holding device according to the present invention. FIG.
FIG. 4 is a diagram showing a first conventional technique.
FIG. 5 is a diagram showing a second prior art.
FIG. 6 is a diagram showing a third prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tunnel digging machine 2 Front trunk 3 Rear trunk 4 Articulated jack 5 Cutter bit 6 Cutter head 7 Cutter head support ring 8 Cutter drive motor 9 Skin plate 10 Bulkhead 11 Chamber 12 Ring girder 13 Post 14 Overhang deck 15, 15a Holding device 16 Support frame 17 Moving jack 18 Swivel ring 19 Guide roller 20 Segment 21 Segment erector 22 Shield jack 23 Ground 24 Spreader 25 Extension jack 26 Rail 27 Wheel 28 Upper shoe 29 Lower shoe 30 Pin 31 Lifting prevention material 32 Cylinder tube 33 Upper piston 34 Lower piston 33a, 34a Piston rod

Claims (3)

A shoe for pressing against the inner surface of the segment, two pistons in one cylinder tube, and an extension jack in which the shoe is connected to the rod end of the two pistons, and a cylinder tube of the extension jack rotating and freely mounted wheels, placed on the overhanging deck tunnel excavator, and a rail in which the wheels roll, the piston upper the extension jack is extended upwardly, the lower piston extending downwardly And a perfect circle holding device comprising an oil supply port A to the bottom chamber of the upper and lower pistons, an oil supply port B to the rod chamber of the upper piston, and an oil supply port C to the rod chamber of the lower piston ,
When tunneling machine is excavating or assembling the segment, after opening filler port B and filler port C, feed oil to filler port A, extend upper and lower pistons, and press upper and lower shoes against the inner surface of the segment , and communication float the cylinder tube a hydraulic circuit of the fuel supply port B fuel supply port C,
After the tunnel excavator has completed the assembly of the segments 1 ring fraction is a true circle holding method of a segment, which comprises contracting the upper and lower pistons. A shoe for pressing against the inner surface of the segment, two pistons in one cylinder tube, and an extension jack in which the shoe is connected to the rod end of the two pistons, and a cylinder tube of the extension jack rotating and freely mounted wheels, placed on the overhanging deck tunnel excavator, and a rail in which the wheels roll, the piston upper the extension jack is extended upwardly, the lower piston extending downwardly And a perfect circle holding device comprising an oil supply port A to the bottom chamber of the upper and lower pistons, an oil supply port B to the rod chamber of the upper piston, and an oil supply port C to the rod chamber of the lower piston ,
When excavating the tunnel excavator or when assembling the segment, pressure oil is sent to the oil supply port A, and the oil supply port B and the oil supply port C send pressure oil to the oil supply port A, the first method for allowing the pressure oil to come freely The oil supply port B allows the pressure oil to come out freely, and the second method of blocking the oil supply port C, or the oil supply port A is blocked, and the oil supply port B allows the pressure oil to come out freely. By one of the third methods of feeding pressurized oil, the upper piston is extended and the upper segment is pressed by the upper shoe,
After the tunnel excavator has completed the assembly of the segments 1 ring component sends pressure oil to the oil supply port B, a feature that is shrunk over the piston disconnect the hydraulic oil from at least one of the fuel supply port A fuel supply port C How to keep the perfect circle of the segment to be executed . A shoe for pressing against the inner surface of the segment, two pistons in one cylinder tube, and an extension jack in which the shoe is connected to the rod end of the two pistons, and a cylinder tube of the extension jack rotating and freely mounted wheels, placed on the overhanging deck tunnel excavator, and a rail in which the wheels roll, the piston upper the extension jack is extended upwardly, the lower piston extending downwardly And a perfect circle holding device comprising an oil supply port A to the bottom chamber of the upper and lower pistons, an oil supply port B to the rod chamber of the upper piston, and an oil supply port C to the rod chamber of the lower piston ,
After During excavation time or segment assembly of tunnel boring machine, the fuel supply port B block, the fuel supply port C was opened and pressed down shoe segment extends below the piston with the oil feed to the fuel supply port A, the fuel supply port or blocking C, and the fuel supply port B is opened, after pressing the upper shoe segment extends over piston and the oil feed to the fuel supply port a, to block the fuel supply port a for positioning a perfect circle holding device , or after the order of pressing the upper and lower shoe segments Conversely, the fuel supply port a block, after positioning the circularity holding device, communicates the hydraulic circuit of the fuel supply port B and the fuel supply port C Float the cylinder tube
After the tunnel excavator has completed the assembly of the segments 1 ring component is the fuel supply port A is opened, the segment, which comprises contracting the upper and lower pistons in the oil feed to the fuel supply port B and the fuel supply port C How to keep a perfect circle.

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