JP2016176211A - Shield excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield excavator that enhances segment assembly work efficiency, by eliminating a limitation on a revolving angle of an erector body.SOLUTION: A shield excavator 1 supplies electricity and exchanges an electric signal between an excavator body 11 side and an erector device 18 side, and includes: a rotary ring 24 supported rotatably inside the excavator body 11; an erector body 35 rotating together with the rotary ring 24; a slip ring 41 rotating together with the erector body 35 and having an electrode 41a connected electrically to the erector body 35 side; and a collector brush 42 fixed on the excavator body 11 to come into contact with the electrode 41a and connected electrically to the excavator body 11 side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shield excavator capable of supplying electric power and transmitting / receiving electric signals between an excavator main body side and an erector apparatus side.

  Generally, in a shield excavator, by rotating the cutter head while extending the shield jack, the excavator body moves forward with a reaction force from the existing segment, and the cutter head excavates the face on the ground in front. In order to do so, tunnels can be dug. At the same time, the segments are assembled along the inner wall surface of the excavated tunnel by driving an erector device provided in the excavator body.

  The erector apparatus moves and turns while the erector body holds the segment, and assembles the segment at a desired position on the inner wall surface of the tunnel. For this reason, the electrical device such as a drive source for performing each operation, a controller for controlling the drive, and a detector for confirming the operation of each drive source is mounted on the erector apparatus. . Therefore, the power supply unit installed in the excavator main body and the electrical equipment mounted on the erector device include various cables such as a power supply cable for supplying power and a signal cable for transmitting and receiving electrical signals. Therefore, it is connected.

  However, depending on the swiveling position of the erector body, the cable may be pulled or loosened and may contact peripheral devices. Therefore, conventionally, an erector apparatus is provided in which the cable routing position can be changed according to the turning position of the erector body. Such a conventional erector apparatus is disclosed in Patent Document 1, for example.

Japanese Patent Laid-Open No. 11-241597

  In the above-described conventional erector apparatus, a cable guide is installed, and a cable bent as the erector body turns is made to wrap around the cable guide. However, in the above-described conventional erector apparatus, the amount of unwinding (length) of the cable is limited, so the turning angle of the erector body is up to about 200 degrees in both the left turn and the right turn. . That is, if the connection is made using a cable, the turning angle of the erector main body is limited.

  Thereby, when assembling the segment using the conventional erector apparatus, for example, the erector body that has completed the assembling of the segment has an initial turning angle (turning initial position) for holding the next segment. When returning, depending on the turning angle for which the assembly has been completed, there is a limitation on the turning angle of the erector body. For this reason, in the said conventional erector apparatus, the assembly | attachment workability | operativity of a segment may fall.

  Therefore, this invention solves the said subject, and it aims at providing the shield excavator which can improve the assembly | attachment operation | work of a segment by removing the restriction | limiting in the turning angle of an erector main body.

The shield excavator according to the first invention for solving the above-mentioned problems is
A cylindrical excavator main body, and an erector device that holds the segment carried into the excavator main body and assembles along the inner wall surface of the tunnel, between the excavator main body side and the erector device side, A shield excavator for supplying power and transmitting and receiving electrical signals,
A revolving ring in the form of a ring supported rotatably around the tunnel axis in the excavator body;
An erector body that swivels around the tunnel axis with the rotation of the swivel ring and holds the segment;
A rotary connector that rotates around the tunnel axis along with the turning of the erector body, and an electrode or trolley wire provided over the entire circumferential direction forms a ring shape that is electrically connected to the erector body side,
It is fixed to the excavator body so as to come into contact with the electrode or the trolley wire, and includes a current collecting brush electrically connected to the excavator body side.

The shield excavator according to the second invention for solving the above-mentioned problems is
The rotary connector is supported by the erector body.

A shield excavator according to a third invention for solving the above-mentioned problems is
The rotary connector is arranged on the inner side in the tunnel radial direction than the erector body.

A shield excavator according to a fourth invention for solving the above-mentioned problems is as follows.
The excavator body is provided with a fixed protective cover that is provided along the circumferential direction of the rotary connector and covers the electrode or the trolley wire.

A shield excavator according to a fifth invention for solving the above-mentioned problems is
A rotation-side protective cover that supports the rotary connector and rotates around the tunnel axis with the turning of the erector body,
A labyrinth structure is formed between both end portions in the width direction of the fixed-side protective cover and both end portions in the width direction of the rotating-side protective cover.

  Therefore, according to the shield excavator according to the present invention, the rotary excavator rotating with the turning of the erector main body, and the current collecting brush that can be slidably contacted with the electrode or the trolley wire provided on the rotary connector are provided. Thereby, the restriction | limiting in the turning angle of an erector main body can be eliminated. Therefore, the assembling workability of the segments can be improved.

1 is a longitudinal sectional view of a shield excavator according to an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is detail drawing of a slip ring, Comprising: (a) is a front view of a slip ring, (b) is a side view of a slip ring. It is sectional drawing when a fixed side protective cover is installed. It is sectional drawing which showed the labyrinth structure formed of the stationary side protective cover and the rotation side protective cover.

  Hereinafter, a shield excavator according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the shield excavator 1 is provided with a cylindrical excavator body 11, and a disc-shaped cutter head 12 is rotatable at the front end of the excavator body 11. It is supported. A large number of cutter bits 13 are mounted on the front surface of the cutter head 12. Therefore, by rotating the cutter head 12, the face can be excavated on the ground in front.

  Further, a bulkhead 14 serving as a partition wall is provided behind the cutter head 12 in the front end portion of the excavator body 11. A chamber 15 is defined between the cutter head 12 and the bulk head 14. The chamber 15 is a space (chamber) for temporarily storing excavated earth and sand, and excavated earth and sand generated by excavating the ground of the cutter bit 13 is excavated by the cutter head 12 in the chamber 15. It is to be taken in through the earth and sand intake.

  Furthermore, a screw conveyor 16 is provided in the excavator body 11 so as to incline upward as it goes from the front end to the rear end. At this time, the front end opening of the screw conveyor 16 passes through the lower part of the bulkhead 14 and is inserted into the chamber 15. Therefore, by rotating the screw conveyor 16, the excavated earth and sand stored in the chamber 15 can be discharged toward the rear of the excavator body 11.

  Furthermore, a plurality of shield jacks (propulsion jacks) 17 are supported on the inner peripheral surface of the excavator body 11 along the circumferential direction of the inner peripheral surface. A spreader 17a is attached to the tip of the drive rod in the shield jack 17, and the spreader 17a faces the front end surface of the existing segment S in the tunnel front-rear direction.

  In other words, the shield jack 17 extends the drive rod toward the rear of the tunnel and presses the spreader 17a against the front end surface of the existing segment S, thereby giving a propulsive force to the excavator body 11. Thereby, the excavator body 11 can move forward in the ground by the propulsion reaction force (excavation reaction force) generated when the shield jack 17 presses the segment S.

  Here, in the rear end portion of the excavator body 11, an erector device 18 is provided. This erector apparatus 18 assembles the segment S as a lining member along the inner wall surface (tunnel wall) of the tunnel T, and the held segment S is assembled in the tunnel longitudinal direction, the tunnel radial direction, and the tunnel circumference. Can be moved in the direction. The segment S is a ring piece that follows the shape of the inner wall surface of the excavated tunnel T. Therefore, the plurality of segments S can be assembled in a ring shape along the circumferential direction of the tunnel by driving the erector device 18.

  Next, the configuration of the above-described erector device 18 will be specifically described with reference to FIGS. 1 to 5.

  As shown in FIGS. 1 and 2, a ring-shaped support frame 21 is fixed to the inner peripheral surface of the excavator body 11. The support frame 21 is provided over the entire circumferential direction on the inner peripheral surface of the excavator body 11. Further, a plurality of brackets 22 are provided on the rear surface of the support frame 21 along the circumferential direction of the frame. A support roller 23 is rotatably supported on the inner end of the bracket 22 in the frame radial direction. . A ring-shaped turning ring 24 is rotatably supported by the support roller 23, and an inner tooth 24 a is formed on the outer peripheral portion of the turning ring 24.

  Further, a turning motor 26 is provided at the inner peripheral end of the support frame 21 via a bracket 25. The drive gear 26 a of the turning motor 26 meshes with the internal teeth 24 a of the turning ring 24. Accordingly, by driving the turning motor 26 and rotating the drive gear 26a, the turning ring 24 meshing with the drive gear 26a can be rotated around the tunnel axis. In addition, although the turning ring 24 is rotatably supported by the excavator body 11 via the support roller 23, it may be rotatably supported by the excavator body 11 via a bearing.

  Further, a pair of left and right fixing bases 31 are provided on the rear surface of the turning ring 24. Guide rods 32 are supported on the fixed base 31 so as to be slidable in the vertical direction, and upper ends of arm members 33 are connected to lower ends of the guide rods 32, respectively. The fixed base 31 is provided with a hydraulic lifting jack 34, and the upper end of the arm member 33 is connected to the tip of the drive rod in the lifting jack 34. An erector main body 35 is provided between the lower ends of the pair of left and right arm members 33. Therefore, by driving the lifting jack 34 and extending and contracting the drive rod, the erector main body 35 can be lifted and lowered.

  As shown in FIG. 3A, an electrical device (drive source, controller, detector, etc.) 38 is connected to the elevating jack 34, and this electrical device 38 is mounted on the erector main body 35. ing.

  Specifically, a hydraulic pump 38a is connected to the lifting jack 34, and a pump driving motor 38b is connected to the hydraulic pump 38a. Further, a controller 38c is connected to the pump drive motor 38b. That is, the hydraulic pump 38a supplies hydraulic oil to the lifting jack 34, and the pump drive motor 38b controls the hydraulic pump 38a. Further, the controller 38c drives and controls the pump drive motor 38b. The lifting jack 34 is provided with a stroke meter 38d. This stroke meter 38d detects the stroke amount of the lifting jack 34 (the lifting amount of the segment S) and is connected to the controller 38c.

  The erector main body 35 has a box shape with an open bottom, and is supported by the arm member 33 so as to be slidable in the tunnel front-rear direction. A slide jack 36 and a holder (gripper) 37 are provided in the erector main body 35. The tip of the drive rod in the slide jack 36 is connected to the arm member 33. Further, the lower end of the holder 37 projects downward from the inside of the erector main body 35, and the segment S can be held by the lower end. Therefore, by driving the slide jack 36 and extending / contracting the drive rod, the erector main body 35 can be moved in the longitudinal direction of the tunnel.

  That is, by driving the lifting jack 34, the segment S held by the holder 37 can be moved in the tunnel radial direction. Further, by driving the turning motor 26, the segment S held by the holder 37 can be moved in the tunnel circumferential direction. Furthermore, by driving the slide jack 36, the segment S held by the holder 37 can be moved in the tunnel front-rear direction.

  Here, as shown in FIG. 1 thru | or FIG. 3 (a), (b), between the turning ring 24 and the erector main body 35, the some slip ring 41 which makes a ring shape is provided. These slip rings 41 are integrally provided so as to overlap in the tunnel front-rear direction, and are supported by the erector main body 35 in such a state. The radius of the slip ring 41 is smaller than the turning radius of the erector main body 35. That is, the slip ring 41 is disposed on the inner side in the tunnel radial direction from the fixed base 31, the guide rod 32, the arm member 33, the lifting jack 34, and the erector body 35, and the rotation of the swiveling ring 24 and the erector body 35. Rotating around the tunnel axis in synchronization with them.

  And as shown in FIG.3 (b), the electrode 41a is each formed in the circumferential direction whole region in the outer peripheral surface of each slip ring 41, respectively. Each of these electrodes 41a is used, for example, for power feeding or electrical signal transmission / reception, and is electrically connected to an electrical device 38 mounted on the erector main body 35.

  Specifically, the electrode 41a of the slip ring 41 used for power feeding is electrically connected to, for example, a pump driving motor 38b and a controller 38c of the lifting jack 34. Moreover, the electrode 41a of the slip ring 41 used for electrical signal transmission / reception is electrically connected to the controller 38c and the stroke meter 38d of the lifting jack 34, for example.

  Further, as shown in FIG. 1 and FIGS. 3A and 3B, a current collecting brush 42 is pressed against the outer peripheral surface of the slip ring 41. The current collecting brush 42 is fixed to the excavator body 11 and is in contact with the electrode 41 a of each slip ring 41. On the other hand, in the excavator main body 11, a power supply unit 43 including a power supply and a control device is installed. The current collecting brush 42 and the power supply unit 43 are connected by a cable 44 in which a plurality of power supply cables and a plurality of electric signal transmission / reception cables are bundled.

  Therefore, even if the slip ring 41 rotates, the electrode 41a comes into sliding contact with the current collecting brush 42 and can be energized between them. Therefore, in the shield excavator 1, from the power source of the power supply unit 43 on the fixed side. The electric power can be supplied toward the electric device 38 of the erector main body 35 on the rotating side, and the control device of the power supply unit 43 on the fixed side and the electric device 38 of the erector main body 35 on the rotating side It is possible to pass electrical signals between them. That is, the slip ring 41 is installed in the shield excavator 1 as a rotary connector for electrically connecting the excavator body 11 side and the erector body 35 side.

  Therefore, when constructing a tunnel structure with the shield excavator 1, the excavator body is extended by rotating the cutter head 12 while extending the plurality of shield jacks 17 and pressing the spreader 17a against the existing segment S. 11 obtains a propulsion reaction force from the existing segment S and moves forward, and a number of cutter bits 13 mounted on the rotating cutter head 12 excavate the face on the front ground. Thereby, the tunnel T can be dug into the ground.

  At this time, the excavated soil generated by the ground excavation is filled into the chamber 15 through the excavated sediment intake of the cutter head 12, and the chamber 15 is filled with the excavated sediment by the filled excavated sediment. The internal pressure is maintained. Then, the excavated earth and sand filled in the chamber 15 is discharged toward the rear of the tunnel by the rotational drive of the screw conveyor 16. That is, the tunnel T is filled with excavated earth and sand and discharged from the chamber 15 while the internal pressure of the chamber 15 is opposed to the earth pressure from the face, thereby stabilizing the face, and the tunnel T Can dig up.

  At the same time, behind the tunnel of the shortened shield jack 17, the held segments S are sequentially assembled in a ring shape along the inner wall surface of the tunnel T by driving the erector device 18.

  That is, the elevator jack 34 is driven to lower the erector main body 35, and then the segment S carried into a predetermined position in the excavator main body 11 is held by the holder 37. Next, the elevator jack 34, the turning motor 26, and the slide jack 36 are sequentially driven, and the segment S held by the holder 37 is assembled along the inner wall surface of the tunnel T to construct a tunnel structure.

  And since the power supply unit 43 installed in the excavator main body 11 and the electric equipment 38 mounted in the erector main body 35 are electrically connected by the slip ring 41 and the current collection brush 42, the cable 44 is connected. The erector main body 35 can be turned while satisfactorily performing power feeding and transmission / reception of electric signals without contacting peripheral members or disconnecting. And since there is no restriction | limiting in the turning angle of the erector main body 35, the erector main body 35 can continue turning in the same turning direction also at the time of left turn and right turn. Thereby, the assembly workability | operativity of the segment S can be improved.

  Here, hydraulic oil is supplied to many hydraulic jacks such as the shield jack 17, the lifting jack 34, and the slide jack 36, and the cutter head 12, screw conveyor 16, swiveling ring 24, swiveling motor 26, etc. Numerous drive units are supplied with lubricating oil. Further, the segments S are continuously supplied into the excavator body 11 and are sequentially assembled by the erector device 18.

  For this reason, in the internal space of the excavator body 11, oil mist due to hydraulic oil and lubricating oil, and dust from the excavated earth and the segment S are floating, and they may adhere to the slip ring 41. is there. In particular, when oil mist or dust accumulates on the electrode 41a, the drive of the erector main body 35 is affected.

  Therefore, as shown in FIG. 4, a fixed-side protective cover 51 and a cleaning brush 52 may be provided. The fixed protective cover 51 is supported by the excavator body 11 similarly to the current collecting brush 42 and is provided along the circumferential direction of the slip ring 41 (circumferential direction of the tunnel T). At this time, the fixed-side protective cover 51 covers the electrode 41a of the slip ring 41 from the outside in the tunnel radial direction, but may be semicircular so as to cover the upper half portion of the electrode 41a of the slip ring 41. . Thus, by providing the fixed-side protective cover 51, it is possible to suppress the adhesion of oil mist and dust to the electrode 41a.

  The cleaning brush 52 is supported on the inner peripheral surface of the fixed protective cover 51 and is disposed on both sides of the current collecting brush 42 in the slip ring circumferential direction. That is, the cleaning brush 52 is pressed against the outer peripheral surface of the slip ring 41 and is in contact with the electrode 41a. Accordingly, when the slip ring 41 rotates, oil mist and dust attached to the electrode 41 a of the slip ring 41 can be removed by the cleaning brush 52.

  In addition, as shown in FIG. 5, when the fixed-side protective cover 51 is used, labyrinth structures 70a and 70b are formed between the fixed-side protective cover 51 and the rotating-side protective cover 61 having a ring shape. It doesn't matter.

  Specifically, the rotation-side protective cover 61 supports the slip ring 41 from the inside in the tunnel radial direction, and rotates with the turning of the erector main body 35. A slip ring 41 is attached to the outer peripheral surface of the rotation-side protective cover 61 via an insulator 62. On the other hand, a power supply cable 63 and an electric signal transmission / reception cable 63 branched from the cable 44 are supported on the fixed protective cover 51 via a packing 64, and a metal body 65 is connected to the tip of the cable 63. Has been. The metal body 65 can be slidably contacted with the electrode 41 a of the slip ring 41.

  Furthermore, the width direction both ends 51a and 51b of the fixed side protection cover 51 and the width direction both ends 61a and 61b of the rotation side protection cover 61 form labyrinth structures 70a and 70b. As described above, the labyrinth structures 70a and 70b are formed by superimposing the fixed-side protective cover 51 and the rotation-side protective cover 61 in the tunnel radial direction, thereby preventing oil mist and dust from adhering to the electrode 41a. .

  In the embodiment described above, the slip ring 41 is used as the rotary connector, but a trolley wire 80 may also be used. That is, as shown in FIGS. 3A and 3B, the trolley wire 80 wound in a ring shape is provided in the erector main body 35 in place of the slip ring 41. Thereby, the trolley wire 80 itself becomes an electrode, and the trolley wire 80 may be electrically connected to the electric device 38 mounted on the erector main body 35.

  When installing a rotary connector, the electrode 41a or the trolley wire 80 may be provided not only on the outer peripheral surface thereof but also on the inner peripheral surface, the front end surface facing the tunnel front, and the rear end surface facing the tunnel rear. I do not care.

  Therefore, according to the shield excavator 1 according to the present invention, the slip ring 41 or the trolley wire 80 that rotates with the turning of the erector main body 35, and the electrode 41a of the slip ring 41 or the trolley wire 80 can slide. By providing the current collecting brush 42, the restriction on the turning angle of the erector main body 35 can be eliminated. Thereby, the assembly workability | operativity of the segment S can be improved.

  In addition, the slip ring 41 or the ring-shaped trolley wire 80 is supported by the erector main body 35 and disposed inside the erector main body 35 in the tunnel radial direction, so that space saving in the excavator main body 11 can be achieved. it can. Furthermore, the fixed side protective cover 51 is provided, or the labyrinth structures 70a and 70b are formed by the fixed side protective cover 51 and the rotation side protective cover 61, whereby the electrode 41a and the trolley wire 80 are replaced with oil mist, Can protect from dust.

  Since the shield excavator according to the present invention eliminates the turning limit when assembling the segments and can assemble the segments at a high speed, the shield excavator can be used extremely beneficially for measures for reducing tunnel construction costs.

DESCRIPTION OF SYMBOLS 1 Shield excavator 11 Excavator main body 18 Elector apparatus 24 Rotating ring 26 Rotating motor 34 Lifting jack 35 Elector main body 37 Holder 38 Electric equipment 41 Slip ring 41a Electrode 42 Current collecting brush 43 Power supply unit 44 Cable 51 Fixed side protective cover 61 Rotation side protective cover 70a, 70b Labyrinth structure 80 Trolley wire S segment T tunnel

Claims (5)

A cylindrical excavator main body, and an erector device that holds the segment carried into the excavator main body and assembles along the inner wall surface of the tunnel, between the excavator main body side and the erector device side, A shield excavator for supplying power and transmitting and receiving electrical signals,
A revolving ring in the form of a ring supported rotatably around the tunnel axis in the excavator body;
An erector body that swivels around the tunnel axis with the rotation of the swivel ring and holds the segment;
A rotary connector that rotates around the tunnel axis along with the turning of the erector body, and an electrode or trolley wire provided over the entire circumferential direction forms a ring shape that is electrically connected to the erector body side,
A shield excavator, comprising: a current collecting brush fixed to the excavator body so as to be in contact with the electrode or the trolley wire and electrically connected to the excavator body side. The shield excavator according to claim 1,
The rotary excavator is characterized in that the rotary connector is supported by the erector body. The shield excavator according to claim 1 or 2,
The rotary excavator is characterized in that the rotary connector is disposed on the inner side in the tunnel radial direction than the erector body. In the shield excavator according to any one of claims 1 to 3,
A shield excavator comprising a fixed-side protective cover provided on the excavator main body along the circumferential direction of the rotary connector and covering the electrode or the trolley wire. The shield excavator according to claim 4,
A rotation-side protective cover that supports the rotary connector and rotates around the tunnel axis with the turning of the erector body,
A labyrinth structure is formed between the width direction both ends of the fixed side protection cover and the width direction both ends of the rotation side protection cover.

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