JP2004251033A - Shield machine for connection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine for connection, which is positively connected to an existing structure, and available for the connection even if it has only a small aperture. <P>SOLUTION: According to the structure of the shield machine for connection, a cutter head 4 is arranged on the front portion of a front trunk 2, and a partition wall 11 partitioning a pressure chamber 20 behind the cutter head 4 from the interior of the front trunk 2, is set, followed by arranging a driving ring body 14 interlocking a cutter drive unit 6 and the cutter head 4 with each other via a bearing leg 15, on a peripheral portion of the partition wall 11 in a manner rotatable about a shield axis. Further a cutting/connecting ring 32 having a cutting bit 32a at the tip thereof is arranged between a skin plate 5 and the driving ring body 14, in a manner protrudable in a shield axial direction and rotatable about the shield axis, and connection mechanisms 37, 38 for disconnectably connecting the driving ring body 14 and the cutting/connecting ring 32 together is arranged on the driving ring body 14. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shield excavator for connecting a new tunnel to an existing structure such as a side wall of an existing pipe.
[0002]
[Prior art]
Conventional connection shield excavators include Patent Literature 1 and Patent Literature 2, for example. In Patent Literature 1, as a transmission means of a turning drive force of a cutting ring, a tip end of a retractable cutter spoke (cutter head) is connected to a protruded cutting ring, and the turning drive force of the cut spoke is applied to the cutting ring. Is communicating.
[0003]
Further, in Patent Document 2, an annular space chamber is formed along the front peripheral edge of the shield main body, a cutter body is provided on the cutter head that can move forward and backward from the annular space chamber, and the cutter body is disposed in the annular space chamber. The cutter head is provided with a multi-stage operating device for retracting.
[0004]
[Patent Document 1]
Patent No. 3335505 (FIG. 2)
[0005]
[Patent Document 2]
JP 2001-32676 A (FIG. 3)
[0006]
[Problems to be solved by the invention]
However, in Patent Literature 1, during normal excavation, the cutting ring is housed in the skin plate of the shield body, and when the existing structure approaches, the excavation is stopped, and the cutting ring is protruded after retracting the Katas spokes. Then, project the Katas Spoke and connect it to the cutting ring. However, if there is an obstacle such as a wrench in front of the cutting ring, the cutting ring cannot be projected smoothly, and if it is forcibly protruded, the cutting ring may be deformed. There is a problem that lacks. Further, since the portion transmitting the turning force to the cutting ring is limited to the position where the cut spoke is arranged, there is a problem in that the design is restricted by the shape and the number of the cut spokes, and the degree of freedom in design is low.
[0007]
In Patent Document 2, since the cutter body can be protruded in the turning state, there is no obstacle at the time of protrusion and a problem in transmitting the turning driving force as in Patent Document 1, but due to the structure of the annular space chamber, the excavated earth and sand is difficult. There is also a problem that it is not suitable for a small-diameter shield machine because of its low fluidity and a large space.
[0008]
An object of the present invention is to solve the above problems and to provide a connection shield excavator that can be securely connected to an existing structure and can be applied even with a small diameter.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a connection shield excavator for excavating a new tunnel and connecting it to an existing structure, wherein the shield excavator is rotatable around a shield axis at a front portion of a shield body. In addition to providing a cutter head, a pressure chamber at the rear of the cutter head and a partition for partitioning the inside of the shield main body are installed, and a cutter driving device provided in the shield main body and the cutter head are connected and linked via a support leg member. A driving ring body is provided on the outer peripheral portion of the partition wall so as to be rotatable around a shield axis, and a cutting connection ring having a cutting member at a distal end portion is provided between the outer peripheral plate of the shield main body and the driving ring body in the shield axial direction. The drive ring body is provided with a connecting mechanism capable of connecting and disconnecting the drive ring body and the cutting connection ring. That.
[0010]
According to the above configuration, the drive ring body and the cutting connection ring are connected by the connection mechanism, and the cutting connection ring can be protruded while turning around the shield axis via the drive ring body. Therefore, even if there is an obstacle such as a wrench between the shield body and the existing structure, it can be cut by the cutting member to reach the existing structure without fail, and the new tunnel can be securely connected to the existing structure. Can be. In addition, the coupling mechanism can be arranged at any position of the drive ring body, and the transmission position of the turning drive force can be set arbitrarily, so that the degree of freedom in design is high, the required space is small, and the shield excavator is small in diameter. Can be applied.
[0011]
The invention according to claim 2 provides a connection ring retracting device capable of driving the cutting connection ring into and out of the shield main body, and the cutting connection ring is arranged around the shield axis at the output end of the connection ring retracting device. A bearing member capable of transmitting a thrust while being rotatably supported is interposed.
[0012]
According to the above configuration, the cutting connection ring can be driven to project while being swung by the connection ring extension / retraction device via the bearing member, and the reliability of the connection can be improved.
[0013]
According to a third aspect of the present invention, the cutting / connecting ring is provided with a connecting / retracting guide portion with which the connecting member of the connecting mechanism is slidably engaged in the shield axial direction.
According to the above configuration, since the connection member of the connection mechanism is directly engaged with the cutting connection ring via the connection / retraction guide, the number of structural members can be reduced and the structure can be simplified.
[0014]
According to a fourth aspect of the present invention, an intermediate ring is provided on an inner peripheral portion of the cutting connection ring so as to be rotatable around a shield axis with respect to the drive ring body, and a cutting connection ring is provided between the intermediate ring and the cutting connection ring. Is provided in such a manner as to be able to move back and forth in the axial direction of the shield, and a connecting portion with which a connecting member of a connecting mechanism is engaged is provided on the intermediate ring.
[0015]
According to the above configuration, at the time of normal excavation, the drive ring body is turned, but the coupling mechanism is released and the intermediate ring is stopped, so that the taken excavated earth and sand co-rotate with the intermediate ring body. The agitation of the earth and sand is promoted and the fluidity is improved. Therefore, even with a small-diameter earth-pressure shield that discharges earth and sand by a screw-type earth removal device, it is possible to discharge excavated earth and sand without blocking it.
[0016]
According to a fifth aspect of the present invention, the cutting connection ring is provided with a liquid injection passage opened at the distal end, and the liquid supply device is connected to the liquid injection passage via a bearing member.
According to a sixth aspect of the present invention, a cutting connection ring is provided with a liquid injection passage which is opened at a distal end portion and is opened at a base end outer peripheral portion. A liquid supply chamber communicating with the liquid injection passage in a moving range is formed.
[0017]
According to the configuration of the fifth or sixth aspect, a liquid such as a chemical solution or water can be supplied to the distal end portion through a liquid injection passage formed in the cutting connection ring via the bearing member or the liquid supply chamber. The drilling member of the cutting connection ring can be effectively cooled and drilling debris discharged.Even if there is a gap at the tip of the cutting connection ring during the connection work, the gap from the liquid injection passage to the tip of the cutting connection ring A filler (chemical solution) can be supplied to effectively stop water.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Here, a first embodiment of a connection shield machine according to the present invention will be described with reference to FIGS.
[0019]
As shown in FIG. 1, a spoke type cutter head 4 is rotatably supported at the front part of the front body 2 of the shield body 1 composed of the front body 2 and the rear body 3. A connection device 6 according to the present invention is provided on the inner periphery of the front part.
[0020]
The front trunk 2 and the rear trunk 3 are connected via a spherical joint 7 so as to be tiltable within a predetermined range, and are inclined according to the turning radius of the new tunnel by a tilting jack 8 connected between the front trunk 2 and the rear trunk 3. Is done. In the rear trunk 3, there are provided an erector device 9 for assembling the segments S and a plurality of propulsion jacks 10 for propelling the shield body 1 with the segments S assembled by the erector device 9 as reaction force receiving members.
[0021]
A partition 11 forming a pressure chamber 20 at the rear of the cutter head 4 is provided at the front of the front trunk 2, and the partition 11 is supported by the skin plate 5 of the front trunk 2 by a support member 12 extending rearward. I have. A drive ring 14 is rotatably supported on the outer periphery of the partition 11 via a swivel bearing 13. The drive ring 14 and the cutter head 4 are connected and fixed by a plurality of support legs (support leg members) 15. ing. As shown in FIGS. 3 and 4, the cutter driving device 16 includes a gear box 16a attached to the back surface of the partition wall 11, a plurality of cutter rotation driving devices (hydraulic motors) 16b provided in the gear box, A ring gear 16c attached to the ring body 14 via the turning ring 13a of the turning bearing 13 on the rear side, and a cutter driving pinion 16d that is driven to rotate by a cutter rotation driving device (hydraulic motor) 16b and meshes with the ring gear 16c. Have been. Reference numeral 18 denotes a rotary joint penetrating the partition 11 from the rear of the cutter head 4 along the shield axis O, a pipe for supplying hydraulic pressure and electricity to the equipment in the cutter head 4, and a cable for transmitting and receiving control signals of the equipment. It is decorated.
[0022]
A screw type discharging device 17 in which a ribbon screw is rotatably arranged in a casing is provided below the partition wall 11, and excavated earth and sand taken into the pressure chamber 20 while maintaining the collapse pressure of the cutting face. Is configured as an earth pressure shield that discharges air.
[0023]
As shown in FIG. 2, the cutter head 4 includes cut-spokes 23A and 23B radially projecting from the center member 21 having the center bit 22 at a predetermined angle (every 90 degrees in the figure). The cutter spokes 23A and 22B have a plurality of drill bits 24 attached thereto and are connected and fixed to the drive ring body 14 via support legs 15, respectively. Further, the two cut-spokes 23A at the symmetrical positions are configured to be telescopic, and the distal end movable portion 23a is radially expanded and contracted by a built-in telescopic drive device (not shown) so as to extend substantially along the outer periphery of the front trunk 2. It is possible to move back and forth between the excavation position and a retreat position at which the cutting connection ring 32 which will be described later retreats from the excavation position and can protrude. Further, a copy cutter device 25 is provided on the remaining cutter spoke 23B so that the excavating blade 25a can move back and forth in the radial direction.
[0024]
As shown in FIG. 4, the connection device 6 used at the arrival position close to the existing structure M such as the pipe wall of the existing pipe has an outer peripheral guide cylinder 31 attached to the front inner peripheral surface of the skin plate 5. A cutting connection ring 32 is rotatably fitted around the shield axis O via a seal member and an outer peripheral bearing, and is fitted inside the shield connection axis O so as to be able to move back and forth. A cutting bit 32a capable of cutting the existing structure M is attached to each of them. An intermediate ring 35 is rotatable around a shield axis O via a seal member and a bearing member between the drive ring body 14 and the gear box 16a and the cutting connection ring 32, and is shielded via an annular flange 35a. The fitting is restricted in the movement in the direction of the axis O. On the inner surface of the cutting connection ring 32, a plurality of key grooves (extension guide sections) 36A are formed along the direction of the shield axis O, and a slide key (extension guide section) protruded from the intermediate ring 35. 36B are slidably fitted in the respective key grooves 36A, and the cutting connection ring 32 is prevented from rotating with respect to the intermediate ring 35.
[0025]
In the drive ring body 14 provided over the entire periphery of the partition 11, connection pins (connection members) 37 project radially at predetermined angles (60 degrees in the figure) around the shield axis O. A retractable connecting / retracting device (hydraulic cylinder) 38 is provided, and a connecting pin hole (connecting portion) 39 in which the connecting pin 37 can be fitted is formed in the intermediate ring 34 to form a connecting mechanism. Is configured.
[0026]
By the way, the intermediate ring 35 is extended to the vicinity of the cutter head 4 corresponding to the distal end of the skin plate 5 and does not rotate during normal excavation in which the coupling mechanism is released. The portion of the intermediate ring 35 protruding forward from the contact with the earth and sand in the pressure chamber 20 does not rotate, thereby increasing the agitation and fluidity of the excavated earth and sand. Since it can be effectively prevented, the present invention can be applied to a small-diameter earth-pressure shield provided with a screw-type earth discharging device.
[0027]
Further, in the vicinity of the intermediate portion of the front body 2, a support plate 41, which is connected to the tilting jack 8 on the inner peripheral surface of the skin plate 5, protrudes in the circumferential direction, and the cutting connection ring 32 extends from the support plate 41. A plurality of retractable connection ring retracting devices 42 are provided. At the base end of the cutting connection ring 32, a bearing member 43 for supporting the cutting connection ring 32 so as to be capable of turning movement and transmitting a propulsive force is attached. The bearing member 43 is provided with an output rod 42a of the connection ring extension / retraction device 42. Are connected.
[0028]
The connection ring retracting device 42 employs a cylinder device having a small stroke because of the installation space, and secures a stroke necessary for projecting the cutting connection ring 32 by adding a plurality of connecting rods 42a from the rear end side. ing. The space chamber 44 that accommodates the cutting connection ring 32 at the outer peripheral portion of the annular support member 12 has a watertight structure because of the provision of the slide key 36 </ b> B having low secrecy. In addition, the connection ring retracting device 42 can be used also by removing the propulsion jack 10 that is not used for the connection work and mounting it on the support plate 41.
[0029]
As shown in FIG. 5, the cutting connection ring 32 is supplied with lubricating water for cooling the cutting bit 32a and discharging chips while the existing structure M is being cut. An injection device 45 for injecting a filler (chemical solution) for filling a gap between the existing structure 32 and the existing structure M is provided. In the liquid injection device 45, an injection hole (liquid injection passage) 46 having a discharge port 46 a opened at the distal end of the cutting connection ring 32 is formed in the shield axis O direction, and the base end of the cutting connection ring 32 is formed. A liquid supply port 46b is opened on the outer peripheral surface (or inner peripheral surface) of the portion. An annular liquid supply passage 46c is formed in the bearing member 43 along the circumferential direction corresponding to the liquid supply port 46b, and a liquid supply hole is formed from a movable pipe 46d to which lubricating water or chemical liquid is supplied from a supply pump (not shown). It is connected to the annular liquid supply passage 46c via 46e. Therefore, even when the cutting connection ring 32 is moved back and forth and turned, lubricating water or a chemical solution can be supplied to the injection hole 46 from the liquid supply hole 46e and the annular liquid supply passage 46c formed in the bearing member 43.
[0030]
Further, as another embodiment different from the liquid injection device 45, as shown in FIG. 6, a liquid injection passage may be configured to be detoured from the bearing member 43. That is, the liquid injection device 47 forms an annular liquid supply chamber 48 between the outer peripheral guide cylinder 31 and the bearing member 43 in the space between the skin plate 5 and the cutting connection ring 32, and discharges the liquid to the tip of the cutting connection ring 32. A liquid supply port 49b of an injection hole (liquid injection passage) 49 having an outlet 49a is opened to face the liquid supply chamber 48. A pipe 49c to which lubricating water or a chemical is supplied from a supply pump (not shown) is connected to the annular liquid supply chamber 48 via a liquid supply hole 49d formed in the skin plate 5. Therefore, even if the cutting connection ring 32 is moved back and forth and turned, lubricating water or chemical liquid can be supplied from the liquid supply chamber 48 to the injection hole 49.
[0031]
A connection operation to the existing structure M by the shield machine in the above configuration will be described. In a state where the cutting connection ring 32 is accommodated in the front body 2 and the connection pin 37 of the connection retracting device 38 is detached from the connection pin hole 39, the drive ring body 14 is driven to rotate by the cutter driving device 16, The cutter head 4 is driven to turn via the support legs 15, and a new tunnel is excavated.
[0032]
When the shield machine approaches the existing structure M and reaches the reaching position, the propulsion is stopped, and the cutter driving device 16 is stopped at a position where the connecting pin 37 faces the connecting pin hole 39. Then, the connection pin 37 is projected by the connection retracting device 38 and fitted into the connection pin hole 39, and the drive ring body 14 and the cutting connection ring 32 are connected. Further, after the tip movable portion 32a of the cut spoke 23A is retracted, the cutter driving device 16 is restarted to drive the cutter head 4 and the cutting connection ring 32 to rotate, and to drive the connection ring retracting device 42. The cutting connection ring 32 is protruded. Further, if necessary, lubricating water is supplied from the liquid injection device 45 to the tip of the cutting connection ring 32 to cut the existing structure M. At this time, the propulsion jack 10 is stopped and the cutter head 4 and the shield main body 1 do not move forward.
[0033]
When the existing structure M is cut by the cutting connection ring 32 and reaches the vicinity of the protruding limit, the obstruction structure is removed from the existing structure M even when the existing structure M is not completely cut, and the cutting connection is further performed. The shield machine is removed except for the ring 32 and the skin plates 5 of the front and rear trunks 2 and 3, and the new tunnel is connected to the existing structure M. At this time, when a gap is generated between the cutting connection ring 32 and the existing structure M and there is a possibility of water leakage, a chemical such as a foaming agent is supplied from the liquid injection device 45 to the tip of the cutting connection ring 32 as necessary. Water can be supplied to the section.
[0034]
According to the above-described embodiment, the drive ring body 14 and the cutting connection ring 32 are connected by the connection mechanism including the connection retracting device 38 and the connection pin 37, and the cutting connection ring 32 is shielded via the drive ring body 14. While pivoting about the axis O, the base end of the cutting connection ring 32 is freely movable in the circumferential direction via the bearing member 43 to the output rod 42a of the connection ring extension / retraction device 42, and is driven to protrude by transmitting thrust. Accordingly, even if there is an obstacle such as a wrench between the shield main body 1 and the existing structure M, the cutting bit 32a can be used to reliably reach the existing structure M by cutting with the cutting bit 32a. 32 allows a new tunnel to be connected to the existing structure M. Further, the connecting and retracting device 38 and the connecting pin 37 can be installed at any positions of the drive ring body 14, and the transmitting position of the turning drive force can be set arbitrarily, so that the degree of freedom in design is high and the necessary space is required. It can be applied to a small and small-diameter shield machine.
[0035]
Further, an intermediate ring 35 rotatable in the circumferential direction with respect to the drive ring body 14 is provided on an inner peripheral portion of the cutting connection ring 32, and a connection pin 37 is fitted into a connection pin hole 39 of the intermediate ring 35 so that the drive ring Since the body 14 is configured to be able to be connected to and disconnected from the cutting connection ring 32, during normal excavation, the intermediate ring 35 from which the connection mechanism has been released is stopped with respect to the drive ring body 14, so that the taken excavated earth and sand is interposed. Without rotating together with the ring body 35, the agitation of the excavated earth and sand in the pressure chamber 20 is promoted, and the fluidity is improved. Therefore, even with a small-diameter earth-pressure shield that discharges earth and sand by a screw-type earth removal device, it is possible to discharge excavated earth and sand without blocking it.
[0036]
Further, liquid injection holes 46 and 49 are formed in the cutting connection ring 32 which is swung and projected, and lubricating water or a chemical solution is injected from the liquid injection hole 46 through the annular liquid supply passage 46 c or the annular liquid supply chamber 48 of the bearing member 43. Since it can be supplied to the tip portion of the cutting connection ring 32, the cutting bit 32a during cutting the existing structure M can be effectively cooled, the cutting waste can be washed away, and the existing structure M can be efficiently cut. be able to. In addition, even if a gap is formed between the tip of the cutting connection ring 32 and the existing structure M, the filler can be injected from the liquid injection holes 46 and 49 to seal the connection, and the connection work can be performed efficiently and safely. It can be performed.
[0037]
Next, a second embodiment of a connection shield machine will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In the second embodiment, the intermediate ring 35 in the first embodiment is omitted, and a connection / retraction guide groove (connection / retraction guide portion) in which the connection pin 37 constituting the connection mechanism is fitted. 61 is formed on the inner surface of the cutting connection ring 32 along the direction of the shield axis O, and the connection pin (connection member) 37 is slidably fitted in the connection / retraction guide groove 61 by the connection retraction device 38. By doing so, the cutting connection ring 32 can be slidably connected to the drive ring body 14 only in the shield axis direction.
[0038]
The ring-shaped outer peripheral plate 62 of the drive ring body 14 is extended to near the cutter head 4 corresponding to the skin plate 5 so that the inner surface of the cutting connection ring 32 is not exposed to the pressure chamber 20. ing.
[0039]
In the above configuration, when the shield machine reaches the reaching position, the propulsion is stopped, and the cutter driving device 16 is stopped at a position where the connecting pin 37 faces the connecting / retracting guide groove 61. Then, the connecting pin 37 is moved back and forth by the connecting / retracting device 38 to be fitted into the connecting / retracting guide groove 61, and the drive ring body 14 and the cutting connection ring 32 are moved only in the direction of the shield axis O (sliding). Move) connect freely. Then, after retracting the distal end movable portion 32a of the cut spoke 23A, the cutter driving device 16 is restarted to drive the cutter head 4 and the cutting connection ring 32 to rotate, and the connection ring extension / retraction device 42 is advanced. The cutting connection ring 32 is protruded.
[0040]
According to the above embodiment, the connection pin 37 of the connection mechanism is directly slidably fitted in the connection / retraction guide groove 61 only in the shield axis O direction, so that the drive ring body 14 and the cutting connection ring 32 Are connected to each other, so that the number of members can be reduced and the structure can be simplified as compared with the second embodiment.
[0041]
【The invention's effect】
As described above, according to the first aspect of the present invention, the drive ring body and the cutting connection ring are connected by the connection mechanism, and the cutting connection ring is projected around the shield axis through the drive ring body. be able to. Therefore, even if there is an obstacle such as a wrench between the shield body and the existing structure, it can be cut by the cutting member to reach the existing structure without fail, and the new tunnel can be securely connected to the existing structure. Can be. In addition, the coupling mechanism can be arranged at any position of the drive ring body, and the transmission position of the turning drive force can be set arbitrarily, so that the degree of freedom in design is high, the required space is small, and the shield excavator is small in diameter. Can be applied.
[0042]
According to the second aspect of the present invention, the connecting ring extending / retracting device can be driven to project while turning the cutting connection ring via the bearing member, and the reliability of the connection can be improved.
[0043]
According to the third aspect of the invention, since the connecting member of the connecting mechanism is directly engaged with the cutting connection ring via the connecting / retracting guide, the number of structural members can be reduced and the structure can be simplified.
[0044]
According to the invention as set forth in claim 4, at the time of normal excavation, the drive ring body is turned, but the coupling mechanism is released and the intermediate ring is stopped, so that the taken excavated earth and sand is transferred to the intermediate ring body. On the other hand, they do not rotate together, and the agitation of the earth and sand is promoted to improve the fluidity. Therefore, even with a small-diameter earth-pressure shield that discharges earth and sand by a screw-type earth removal device, it is possible to discharge excavated earth and sand without blocking it.
[0045]
According to the configuration of claim 5 or 6, a liquid such as a chemical solution or water can be supplied to the distal end portion through a liquid injection passage formed in the cutting connection ring via a bearing member or a liquid supply chamber. Effectively cools the excavated members of the connection ring and discharges drilling debris.Even if there is a gap at the tip of the cutting connection ring during the connection work, the tip of the cutting connection ring is filled from the liquid injection passage. The material (chemical solution) can be supplied to effectively stop water.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a shield machine according to the present invention, and is an overall longitudinal sectional view of a connected state.
FIG. 2 is a front view of the shield machine.
FIG. 3 is a partial vertical sectional view showing a front part of the shield machine.
4 (a) and 4 (b) each show a connection device of the shield machine, FIG. 4 (a) is a partially enlarged sectional view during normal excavation, and FIG. FIG.
FIG. 5 is a longitudinal sectional view showing a liquid injection device of the shield machine.
FIG. 6 is a longitudinal sectional view showing another embodiment of the liquid injection device of the shield machine.
FIGS. 7 (a) and 7 (b) show a second embodiment of a shield machine according to the present invention, wherein FIG. 7 (a) is a partially enlarged sectional view of a connection device during normal excavation, and FIG. It is a partial expanded sectional view of the excavation connection ring advanced state of a connection device.
[Explanation of symbols]
S Segment O Shield axis M Existing structure 1 Shield body 2 Front trunk 3 Rear trunk 4 Cutter head 5 Skin plate 6 Connection device 7 Spherical joint 8 Tilting jack 9 Electra device 10 Propulsion jack 11 Partition wall 12 Support member 13 Slewing bearing 14 Drive Ring body 15 Support leg 16 Cutter driving device 20 Pressure chambers 23A, 23B Cutter spokes 23a Tip movable portion 25 Copy cutter device 31 Outer peripheral guide cylinder 32 Cutting connection ring 32a Cutting bit 35 Intermediate ring 36A Key groove 36B Sliding key 37 Connection pin 38 Connection Injecting / retracting device 39 Connecting pin hole 42 Connecting ring retracting device 45 Injection device 46 Injection hole 47 Injection device 48 Annular liquid supply chamber 49 Injection hole

Claims (6)

A shield shield machine for excavating a new tunnel and connecting to an existing structure,
A cutter head rotatable around the shield axis is provided at the front of the shield body, and a pressure chamber at the rear of the cutter head and a partition partitioning the shield body are installed.
A drive ring body for connecting and interlocking a cutter driving device and a cutter head provided in the shield body via a support leg member is provided on the outer peripheral portion of the partition wall so as to be rotatable around a shield axis,
Between the outer peripheral plate of the shield body and the drive ring body, a cutting connection ring having a cutting member at a distal end portion is provided so as to be able to move back and forth in the shield axis direction and pivot around the shield axis,
A connection shield excavator, wherein the drive ring body is provided with a connection mechanism capable of connecting and disconnecting the drive ring body and the connection cutting connection ring. A connecting ring retracting device capable of driving the cutting connection ring into and out of the shield body is provided in the shield body, and the output end of the connecting ring retracting device supports the cutting connection ring so as to be capable of turning around the shield axis so as to be capable of thrust. The shield excavator for connection according to claim 1, wherein a bearing member capable of transmitting the force is interposed. 3. The shield excavation for connection according to claim 1, wherein the cutting connection ring is provided with a connection / retraction guide portion in which a connection member of a connection mechanism is slidably engaged in a shield axial direction. Machine. Provided on the inner periphery of the cutting connection ring is an intermediate ring that can rotate around the shield axis with respect to the drive ring body,
Provided between the intermediate ring and the cutting connection ring, a retractable guide portion that guides the cutting connection ring to be able to move back and forth in the shield axis direction,
The connection shield machine according to claim 1, wherein a connection portion with which a connection member of a connection mechanism is engaged is provided on the intermediate ring. In the cutting connection ring, a liquid injection passage opened at the tip is formed,
The connection shield machine according to any one of claims 1 to 4, wherein a liquid supply device is connected to the liquid injection passage via a bearing member. In the cutting connection ring, a liquid injection passage opened at the distal end and opened at the outer periphery at the base end side is formed,
5. The connection according to claim 1, wherein a liquid supply chamber communicating with the liquid injection passage is formed between the cutting connection ring and the outer peripheral plate in a range in which the cutting connection ring moves back and forth. Shield excavator.

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