JP4756160B2 - Method of operating shield machine, rotary joint and shield machine - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used when constructing a tunnel, a sewer, etc. (hereinafter collectively referred to as “excavation mine”) in the ground, and a rotary joint used for the shield machine and a method for operating the shield machine.

  Conventionally, a shield machine has a rotary excavation unit that excavates a natural ground (same as the ground) to create an excavation pit, a cylindrical main unit in which the rotary excavation unit is installed, and a rear end of the main unit. A cylindrical tail portion, segment assembling means for assembling the arc-shaped segment member into the cylindrical segment cylindrical body (same as the segment erector or the erector apparatus), and the assembled segment cylindrical body toward the rear Pushing and pushing means to advance the body part by the reaction force (same as shield jack), tail seal means to seal the gap between segment cylindrical body and tail part, and gap between segment cylindrical body and excavation mine A back material injecting means for injecting the back material, and a soil discharging means for discharging the excavated earth and sand to the outside of the machine.

The rotary excavation part has a center shaft rotatably supported on the main body part, a cutter pork radially arranged on the center shaft, a cutter bit installed on the front surface of the cutter pork, and an outer periphery of the cutter pork. A copy cutter that can be moved forward and backward, and a hydraulic cylinder that is installed on the cutter pork and moves the copy cutter back and forth.
In order to supply hydraulic pressure to the hydraulic cylinder, a rotary joint fixing portion (hereinafter referred to as a “stator”) is installed in the main body portion, and a rotary joint rotating portion (hereinafter referred to as the main shaft portion side end portion) of the center shaft. (Referred to as Patent Document 1).

  In recent years, along with the increasing distance of shield tunnels, there has been a demand to interrupt temporary digging during excavation work and to replace worn or damaged cutter bits with new ones. In response to such a request, the inventors have already successfully developed and disclosed a cutter bit exchanging means and a cutter bit exchanging method capable of exchanging cutter bits quickly and easily at low cost.

  Such cutter bit replacement means includes a cylindrical rotating body (corresponding to a center shaft) in which a cutter pork is installed, a cutter bit storage chamber that slides on the inner peripheral surface of the cylindrical rotating body, and a cutter bit storage chamber. Cutter bit pushing means for pushing out the stored new cutter bit to the cutter pork. Therefore, it is not necessary to construct a working shaft or the like in front of the shield machine, and it is possible to attach a new cutter bit to the cutter pork from the main body of the shield machine only by temporarily interrupting the drilling. This is effective (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 7-2224596 (pages 3 to 4, FIG. 1) JP2003-232192A (pages 6-7, FIG. 4)

The invention disclosed in Patent Document 2 uses a hydraulic cylinder in order to fix a new cutter bit attached to a cutter pork. Since the hydraulic cylinder keeps pressing the cutter bit even during digging (same as the case where the cutter pork is rotating), hydraulic pressure is always supplied to the cylindrical rotating body through the rotary joint. ing.
At this time, the rotation center of the cylindrical rotating body and the central axis of the rotary joint coincide with each other, and the cylindrical rotating body needs to store a new cutter bit in the cutter bit storage chamber installed therein. Since the main body portion side is wide open, there is no end portion suitable for installing a rotary joint rotor such as the center shaft disclosed in Patent Document 1. That is, in order to install the rotary joint, it is necessary to install a stator supporting means for supporting the stator in the main body part, and to install a rotor supporting means for supporting the rotor in the rotary excavation part and transmitting the rotation to the rotor. is there.
For this reason, the stator support means and the rotor support means may become obstacles when storing a new cutter bit in the cutter bit storage chamber, which may complicate the work or reduce the work efficiency. However, these are common problems that are desired to be improved in various shield machines equipped with rotary joints, and are not limited to shield machines equipped with cutter bit replacement means that the inventors have successfully developed and their operating methods. Absent.

  The present invention has been made to solve the above-described problems and problems, and to obtain a shield joint machine capable of easily changing the position of a rotary joint and a method for operating the rotary joint and shield machine used therein. With the goal.

(1) A shield machine according to a first embodiment of the present invention includes a main body part, a rotary excavation part that is installed at the front end of the main body part to excavate natural ground, and the rotary excavation part and the main body. A rotary joint that is at least connected to the hydraulic piping between the two parts,
When the rotary excavation part is stopped, the rotary joint is movable from the position of the rotation center of the rotary excavation part.

(2) Moreover, the rotary joint which concerns on the 2nd form of this invention is attached to the shield machine which has a main-body part and the rotary excavation part which excavates a natural ground while installing and rotating at the front end of this main-body part. And connecting at least hydraulic piping between the main body and the rotary excavation part,
When the rotary excavation part is stopped, the rotary excavation part can be moved from the position of the rotation center of the rotary excavation part.

(3) Moreover, the operating method of the shield machine according to the third embodiment of the present invention includes a main body part, a rotary excavation part that is installed at the front end of the main body part to excavate natural ground, and the rotation A method for operating a shield machine having a rotary joint that connects at least a hydraulic pipe between the excavation part and the main body part,
Installing the rotary joint coaxially with the rotation center of the rotary excavation unit; rotating the rotary excavation unit with the rotary joint installed coaxially with the rotation center of the rotary excavation unit; And a step of moving the rotary joint from the position of the rotation center of the rotary excavation part in a state where the rotary excavation part is stopped.

(4) Moreover, the shield machine according to the fourth embodiment of the present invention includes a main body portion formed in a cylindrical shape by a skin plate, and a rotary excavation portion installed at an end of the main body portion on the excavation direction side. And a rotary joint that rotatably connects the rotary excavation part and the main body part,
The stator of the rotary joint is installed on stator support means supported by the main body so as to be swingable so as to cross the rotation center of the rotary excavation unit,
When the rotary excavator is rotating, the rotational center of the rotary excavator coincides with the central axis of the rotor of the rotary joint, and when the rotary excavator is stopped, the rotational excavator is rotated from the rotational center of the rotary excavator. The rotary joint can be freely displaced.

(5) A shield machine according to a fifth embodiment of the present invention is the one according to the fourth embodiment, wherein the rotary joint supplies air pressure or hydraulic pressure from the main body portion to the rotary excavation section. One or more of a supply function, an electric supply function for supplying electric power, and a signal transmission / reception function for transmitting and receiving electric signals are provided.

(6) Further, in the shield machine according to the sixth aspect of the present invention, in the fourth or fifth aspect, the center axis of the rotor of the rotary joint coincides with the rotation center of the rotary excavation part. Stator center fixing means for fixing the swing of the stator support means at a position, or stator eccentric fixing for fixing the swing of the stator support means at a position where the rotary joint is displaced from the rotation center of the rotary excavation part. One or both of the means is installed in the body part;
Furthermore, when the rotary excavation part is rotating, the rotation of the rotary excavation part is transmitted to the rotor of the rotary joint, and when the rotary excavation part is stopped, the rotary excavation part is rotated from the rotation center of the rotary excavation part. Rotor rotating means for allowing the joint to be displaced is installed in the rotary excavation section.

(7) Further, in the shield machine according to the seventh aspect of the present invention, in any one of the fourth to sixth aspects, a cutter bit is detachably installed in the rotary excavation section, and the rotation When the excavation part is stopped, a cutter bit is attached from the main body part to the rotary excavation part.

(8) Furthermore, the operating method of the shield machine according to the eighth embodiment of the present invention is installed at the main body part formed in a cylindrical shape by the skin plate and at the end part of the main body part on the excavation direction side. A rotary excavation section, a rotary joint that rotatably connects the rotary excavation section and the main body section, and a stator support means that swingably supports a stator of the rotary joint so as to cross the rotation center of the rotary excavation section. And having
In a state in which the rotation of the rotary excavation portion is stopped, the step of swinging the stator support means to align the rotation axis of the rotary joint with the rotation center of the rotary excavation portion;
Rotating the rotary excavation unit in a state where the rotation center of the rotary excavation unit and the rotation axis of the rotary joint coincide with each other;
Swinging the stator support means in a state where the rotation of the rotary excavation portion is stopped, and deviating the rotation shaft of the rotary joint from the rotation center of the rotary excavation portion. To do.

(9) A rotary joint according to a ninth aspect of the present invention is attached to a shield machine having a main body part and a rotary excavation part that is provided at the front end of the main body part and excavates natural ground while rotating. A rotary joint that connects at least the hydraulic piping between the rotary excavation part and the main body part, and is configured to be movable toward the inner wall side of the main body part when the rotary excavation part is not rotating. It is characterized by that.

(10) A rotary joint according to a tenth aspect of the present invention is attached to a shield machine having a main body portion and a rotary excavation portion that is provided at the front end of the main body portion and excavates natural ground while rotating. A rotary joint between the rotary excavation part and the main body part for connecting at least hydraulic piping, a rotor connected to the rotary excavation part side, and a stator supported on the main body part side, And a stator support means for supporting the stator on the main body side so that the stator support means can move the stator to the inner wall side of the main body section when the rotary excavation section is not rotating. It is characterized by being comprised.

(11) Further, in the rotary joint according to the eleventh aspect of the present invention, in the tenth aspect, the stator support means is connected at one end side to the stator side of the rotary joint and at the other end side to the main body side. In the attached state, it is configured to be rotatable in a plane perpendicular to the excavation direction.

(12) A rotary joint according to a twelfth aspect of the present invention is the one according to the tenth or eleventh aspect, wherein one end side is configured to be connectable to the rotary excavation part side, and the other end side is a rotor of the rotary joint. And a rotor rotating means which is detachably connected to the side and transmits the rotation of the rotary excavation part to the rotor side.

(13) A shield machine according to a thirteenth embodiment of the present invention is characterized by including any one of the rotary joints according to the ninth to twelfth embodiments.

(14) In addition, the operating method of the shield machine according to the fourteenth aspect of the present invention includes a main body part, a rotary excavation part provided at the front end of the main body part for excavating natural ground, and the rotation A rotary joint between the excavation part and the main body part for connecting at least hydraulic piping, one end side is connected to the rotary excavation part side, and the other end side is detachably connected to the rotor side of the rotary joint, and the rotary excavation part Rotor rotation means for transmitting the rotation of the rotor to the rotor side, and stator support means for supporting the stator by one end side being rotatably connected to the main body side and the other end being connected to the stator side of the rotary joint. A method for operating a shield machine comprising:
Rotating the rotary joint from the one end side of the stator support means as a base point so that the rotation axis of the rotary joint coincides with the rotation center of the rotary excavation part;
Rotating the rotary excavation unit in a state where the rotation center of the rotary excavation unit and the rotation axis of the rotary joint coincide with each other;
And rotating the stator support means to move the rotary joint to the inner wall side of the main body in a state where the rotation of the rotary excavation portion is stopped. .

  Therefore, according to the present invention, when the rotary excavation part is stopped, the rotary excavation part can be moved or displaced from the position of the rotation center of the rotary excavation part, so that a work space in the vicinity of the front end of the main body part is secured. The Therefore, various operations that need to be performed in this space, for example, replacement of a cutter bit attached to the rotary excavation part (including attachment of the cutter bit to the rotary excavation part) is easy, quick, or efficient. Has a remarkable effect. This is particularly beneficial in shield machines that require a small working space, particularly small shield machines.

[Embodiment 1]
(Shield machine)
1 to 3 show a front end portion of a shield machine according to an embodiment of the present invention. FIG. 1 is a sectional view in side view, FIG. 2 is a front view, and FIG. 3 is a partially enlarged view. .
1 to 3, a shield machine 100 includes a cylindrical main body 10 and a rotary excavation section 20 that is located at the front end (left side in the figure) of the main body 10 and excavates natural ground to create an excavation mine. A rotary drive unit 30 for rotationally driving the rotary excavation unit 20, a rotary joint (hereinafter referred to as "RJ") 40 for supplying hydraulic pressure from the main body unit 10 to the rotary excavation unit 20, and a fixing unit for the RJ 40 Rotating to a stator support means 50 for supporting 41 (hereinafter referred to as “stator 41”), a stator fixing means 60 for fixing the position of the stator support means 50, and a rotating portion 42 of RJ 40 (hereinafter referred to as “rotor 42”). And a rotor rotating means 70 for transmitting the rotation of the excavating unit 20.

  Further, a cutter bit exchanging means 80 for mounting a cutter bit from the main body 10 to the rotary excavation unit 20, a screw conveyor 90 for discharging excavated earth and sand, and an assembly for assembling segments into an annular segment cylindrical body An erector device (not shown), a shield jack (not shown) that pushes the segment cylindrical body backward and digs the main body 10 with the reaction force (same as forward), a segment cylindrical body, and a digging mine Backing material injection means (not shown) for injecting the backing material into the gaps.

(Main body)
The main body 10 is a cylindrical body formed by a skin plate 11, and a bulkhead 12 is installed at one end (hereinafter referred to as “front end”) to form a watertight structure.
A central opening 13 that opens in the center of the bulkhead 12 is provided, and a rotary excavation part support mechanism 14 that rotatably and watertightly supports the rotary excavation part 20 is installed along the inner edge of the central opening 13. A soil discharge opening 15 is provided at a position close to the skin plate 11 displaced from the opening 13 to the outer peripheral side, and a soil intake port of the screw conveyor 90 is installed along the soil discharge opening 15.

(Rotating excavation part)
The rotary excavation part 20 includes a rotary end part 21, a rotary cylinder part 22, a rotary cone part 23, a rotary base part 24, and cutter porks 25a, 25b, 25c, 25d, 25e (hereinafter referred to as radial holes) installed in the rotary cylinder part 22. And the auxiliary spokes 28a, 28b, and 28c (hereinafter collectively referred to as "auxiliary spokes 28") installed between the cutter spokes 25.

  The cutter pork 25 is a box having a substantially rectangular cross section, and a groove-like cutter bit mounting groove 88 is formed on the front plate (on the side of the excavation direction). The cutter bit mounting groove 88 has a substantially convex shape that is narrow at the front and wide at the rear, and is formed in a front length from an end on the inner peripheral side to an end on the outer peripheral side.

The cutter bit 1 has a generally convex shape in cross section, and a narrow center protruding portion of the cutter bit 1 protrudes from the cutter bit mounting groove 88 to the front surface, and a wide mounting portion of the cutter bit 1 corresponds to the cutter bit mounting groove 88. It is stored in the widened back.
A cutter bit fixing plate 26 for fixing the cutter bit 1 supplied to the cutter bit mounting groove 88 so as not to move is disposed in the cutter bit mounting groove 88, and the cutter bit fixing cylinder for moving the cutter bit fixing plate 26 forward and backward. 27 is installed.
Therefore, when the cutter bit fixing plate 26 is moved forward, the rear surface of the cutter bit 1 comes into contact with the cutter bit fixing plate 26, and its mounting portion (more precisely, the narrow central protruding portion and the wide mounting portion) The step portion) is pressed against the cutter bit mounting groove 88. On the other hand, when the cutter bit fixing plate 26 is retracted, the cutter bit fixing plate 26 is separated from the cutter bit 1, and the cutter bit 1 becomes movable in the cutter bit mounting groove 88 released from the pressing.

The auxiliary spokes 28a, 28b, 28c are provided with a copy cutter 2 installed so as to be able to advance and retract toward the outer periphery and copy cutter advance / retreat cylinders 29a, 29b, 29c for moving the copy cutter 2 back and forth. That is, if the copy cutter 2 is advanced and excavated, the inner diameter of the excavation pit excavated by the cutter bit 1 (corresponding to the diameter of a circle drawn by the outer peripheral end of the cutter pork 25) slightly increases.
Further, a rotary cutter 3 called a “fushtail” is installed on the front surface of the rotary end 21. That is, the predetermined range including the rotation center is excavated by the rotary cutter 3.
In addition, a plurality of excavation bits 301 are embedded in the rotary cutter 3 so as to be advanced, and the excavated bits 301 that are worn out are pushed forward by the hydraulic cylinder 302 by an amount corresponding to the wear amount. Is maintained. At this time, since the hydraulic cylinder 302 is installed on the main body side of the worn excavation bit 301 among the plural excavation bits 301, the hydraulic cylinder 302 may be installed only on the excavation bit 301 that performs the pushing operation. It is not necessary to always install all the excavation bits 301 on the main body side.

(Rotation drive)
The rotation drive unit 30 includes a motor 31 and a drive gear 32 installed on the bulkhead 12 and a driven gear 33 installed on the rotation base 24 of the rotary excavation unit 20, and has a small-diameter drive gear 32 and a large-diameter drive gear 32. The driven gear 33 meshes with each other to form a speed reduction mechanism, thereby realizing high torque rotation of the rotary excavation unit 20.

(Rotary joint)
The RJ 40 includes a stator 41 made of a cylindrical body, and a rotor 42 made of a cylindrical body that rotates and slides liquid-tightly on the inner peripheral surface of the stator 41. The stator 41 is connected to a main body side hydraulic pipe 4 that supplies hydraulic pressure to the stator 41 from a hydraulic supply means (not shown) installed in the main body section 10. The rotor 42 is connected to the rotary excavation section 20 from the rotor 42. A rotary hydraulic pipe 5 for supplying hydraulic pressure is connected. The rotation-side hydraulic pipe 5 is connected to a cutter bit fixing cylinder 27 of each cutter spoke 25 and a copy cutter advance / retreat cylinder 29 (29a, 29b, 29c) for each auxiliary spoke 28 (28a, 28b, 28c). However, it is illustrated in a simplified manner.
One or a plurality of ring-shaped recesses (not shown) are formed on the inner peripheral surface of the stator 41 of the RJ 40, and the outer surface of the rotor 42 of the RJ 40 opens to a position corresponding to the ring-shaped recess. A hydraulic opening hole (not shown) is formed, and a hydraulic path (not shown) that communicates with the hydraulic opening hole and reaches the end surface of the rotor 42 is formed. Therefore, the hydraulic pressure supplied to the stator 41 is continuously supplied to the rotor 42 via the ring-shaped recess even when the rotor 42 is rotating.

In addition, since it is arbitrary whether the cylindrical body or columnar body of RJ40 is set to the fixed side (or the low-speed rotation side) or the rotation side (or the high-speed rotation side), In the case where this is disposed in the rotor 42 and the cylindrical body is disposed in the rotary excavation unit 20, this becomes the stator 41.
Further, the RJ 40 has one or more ring-shaped electrical contacts formed on one of the inner peripheral surface of the stator 41 or the outer peripheral surface of the rotor 42, and on the other of the inner peripheral surface of the stator 41 or the outer peripheral surface of the rotor 42. You may comprise the slip ring mechanism in which the sliding contact which short-circuited and slides to this ring-shaped contact was formed.

(Stator support means)
FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 and is a view showing a state in which the stator support means, the stator fixing means, and the rotor rotation means of the shield machine according to the embodiment of the present invention are viewed from the back. .
4A, the stator support means 50 includes a rotary joint swing arm 52 (hereinafter referred to as “stator support lever 52”) on which the stator 41 of the RJ 40 is installed, and one end portion of the stator support lever 52. A support lever fulcrum 51 that supports the lever in a swingable manner and a support lever fixing hole 53 into which a support lever fixing pin 64 described later is inserted.
The support lever fulcrum 51 includes a fulcrum pin installed on the bulkhead 12 (substantially the same as that installed on the skin plate 11) and a fulcrum hole or fulcrum bearing installed on the stator support lever 52 (sliding on the fulcrum pin). However, a fulcrum hole or a fulcrum bearing may be installed in the bulkhead 12 and a fulcrum pin may be installed in the stator support lever 52.

Therefore, the stator support lever 52 can swing around the support lever fulcrum 51 as a swing center, and the center axis of the RJ 40 (same as the center axes of the rotor 42 and the stator 41) is rotated by the swing. Coincides with or deviates from the center of rotation.
In addition, although the aspect which performs this rocking | swiveling in the surface perpendicular | vertical with respect to the rotation center of the rotary excavation part 20 is shown, this invention is not limited to this, The center of RJ40 is not limited to this. As long as the axis coincides with the rotation center of the rotary excavation unit 20, the process may be performed in a plane that is not perpendicular (inclined) to the rotation center of the rotary excavation unit 20.

(Stator fixing means)
4A, the stator fixing means 60 is disposed on the rear side of the stator supporting means 50 (see FIG. 3). The stator fixing lever 62 and one end of the stator fixing lever 62 are provided. A fixed lever fulcrum 61 that supports the swing lever and fixed lever fixing holes 63a, 63b, and 63c into which the support lever fixing pin 64 is inserted (in FIG. 4A, the fixed lever fixing). (In FIG. 6, it is also inserted into 63a and 63c as described later).
The fixed lever fulcrum 61 includes a fulcrum pin installed on the bulkhead 12 (substantially the same as that installed on the skin plate 1), and a fulcrum hole or bearing provided on the stator support lever 52 (sliding on the fulcrum bin). However, a fulcrum hole or a point bearing may be installed on the bulkhead 12 and a fulcrum pin may be installed on the stator fixing lever 62.

The stator fixing lever 62 is swingable about the fixed lever fulcrum 61 as a swing center, and swings in a plane substantially parallel to the plane on which the stator support lever 52 swings.
Further, when the stator support lever 52 and the stator fixing lever 62 are swung, the fixing lever fixing holes 63 a, 63 b, 63 c of the data fixing lever 62 coincide with the supporting lever fixing holes 53 of the stator support lever 52. Are arranged as follows.

Further, when the support lever fixing hole 53 of the stator support lever 52 and the fixing lever fixing hole 63b of the stator fixing lever 62 coincide with each other, the central axis of the RJ 40 (same as the central axes of the rotor 42 and the stator 41) is rotated and excavated. It coincides with the center of rotation of the portion 20.
Therefore, in this state, the support lever fixing pin 64 is inserted into the support lever fixing hole 53 of the stator support lever 52 and the fixing lever fixing hole 63b of the stator fixing lever 62, so that the stator support lever 52 and the stator fixing lever are inserted. When connecting to 62, the central axis of the RJ 40 is maintained in a state coincident with the rotational center of the rotary excavation section 20, and a center fixing means is formed (FIG. 4 shows such a state).

On the other hand, when the support lever fixing hole 53 of the stator support lever 52 is aligned with the fixing lever fixing hole 63a or 63c of the stator fixing lever 62, the RJ 40 is displaced from the rotation center of the rotary excavation unit 20. ing.
Therefore, in this state, the support lever fixing pin 64 is inserted into the fixing lever fixing hole 63a or 63c of the stator fixing lever 62 and the support lever fixing hole 53 of the stator support lever 52, and the stator fixing lever 62 and the stator support are inserted. If the lever 52 is connected, the RJ 40 is maintained in a state of being deviated from the rotation center of the rotary excavation unit 20, and an eccentric fixing means is formed.

  The manner of connecting the stator fixing lever 62 and the stator support lever 52 is not limited to the above-described one. Instead of the fixing hole and the fixing pin, screw holes and bolts may be used, or the stator fixing lever 62 or the stator. A fixing hole is formed on one side of the support leper 52, a fixing pin is previously installed on the other side, or a locking part (a concave part or the like) provided on the other side of a locked part (a convex part or a concave part) provided on one side Alternatively, the convex part) may be locked, or one may grip the other in a non-movable manner, or a separate gripping means may be provided for gripping both in a non-movable manner.

(Rotor rotating means)
4A, the rotor rotating means 70 is disposed on the forward side of the stator supporting means 50 (see FIG. 3), and the rotor rotating lever 72 and one end of the rotor rotating lever 72 are included. Rotating lever fulcrum 71 that rotatably supports the rotating lever, a rotating lever fixing hole 73 into which the rotating lever fixing pin 74 is inserted, and a rotor guide groove 75 through which the rotor 42 of the RJ 40 passes. .
The rotating leper fulcrum 71 is constituted by a fulcrum pin installed in the rotary cone part 23 of the rotary excavating part 20 and a fulcrum hole or fulcrum bearing (slidable on the fulcrum pin) installed in the rotor rotation lever 72. A fulcrum hole or a fulcrum bearing may be installed in the rotary cone portion 23, and a fulcrum pin may be installed in the rotor rotation lever 72.
The rotor guide groove 75 has a width substantially equal to the outer diameter of the rotor 42 and restricts the swing range of the RJ 40.
The connecting portion of the rotor 42 to the rotor guide groove 75 is configured such that the connecting portion can slide in the rotor guide groove 75 but cannot rotate. That is, the cross-sectional shape orthogonal to the axial direction of the connecting portion in the rotor 72 is not a circle but an oblong shape.

The rotor rotation lever 72 is swingable about a rotation lever fulcrum 71 as a swing center in a plane substantially parallel to the plane on which the stator support lever 52 swings.
Further, during such swinging, when the central axis of the RJ 40 coincides with the rotational center of the rotary excavation unit 20, a rotor fixing hole (not shown) formed in the rotor 42 and the rotor rotation lever 72 It arrange | positions so that the rotation lever fixing hole 73 may correspond.
Accordingly, the rotor fixing hole of the rotor 42 and the rotation lever fixing hole 73 of the rotor rotation lever 72 are made to coincide with each other, and the rotation lever fixing pin 74 is inserted into both the fixing holes, so that the rotor rotation lever 72 and the rotor 42 is connected, the rotation of the rotary excavation unit 20 is transmitted to the rotor 42.

  Note that the way of connecting the rotor rotation lever 72 and the rotor 42 is not limited to the above, and the description is omitted because it conforms to the way of connecting the stator support lever 52 and the stator fixing lever 62 described above. Further, the installation of the rotor guide groove 75 provided in the rotor rotation lever 72 may be saved. That is, a means for guiding the rotation of the rotor rotation lever 72 (same as the means for regulating the swing range) is provided at the rotation lever fulcrum 71 of the rotor rotation lever 72 or at one or both of the rotor rotation lever 72 and the rotor 42. May be.

  Further, the structure of the stator fixing lever 62 and the rotor rotation lever 72 is not limited to that described above. The former has a center fixing function and an eccentric fixing function of the stator support lever 52, and the latter has a rotation transmission function and a rotation blocking function. (A function to make the rotor rotation lever 72 swingable) may be provided.

In FIG. 4B, the stator fixing lever 62 is provided only with a fixed leper fixing hole 63b, while the bulkhead 12 is provided with fixing lever fulcrums 61a, 61b, 61c. The stator fixing lever 62 is detachably supported at any position of the fixing lever fulcrums 61a, 61b, 61c, and the supporting lever is fixed at a position where the fixing lever fixing hole 63b and the support lever fixing hole 53 coincide. The pin 64 is positioned by being inserted into both holes, and can be tilted with respect to the stator support lever 52 (the two levers 62 and 52 can be opened and closed with respect to each other like a clock hand, with the rotation axis of the rotary digging portion 20 as the center). To be moved).
The rotor 41 of the RJ 40 is supported from the radial direction by three rotor rotation levers 72a, 72b, 72c. That is, rotating lever fulcrums 71 a, 71 b, 71 c for detachably connecting one end of the rotor rotating levers 72 a, 72 b, 72 c are installed on the rotating cone portion 23 of the rotary excavating unit 20. An attachment / detachment means is provided for detachably connecting the other ends of the rotor rotation levers 72a, 72b, 72c.

Therefore, if the stator fixing lever 62 is supported at the position of the fixing lever fulcrum 61b, the center axis of the stator 41 coincides with the rotation center of the rotary excavation part, and the rotor rotation lever 72a, 72b, 72c is used to rotate the rotor 41 into a rotating cone. When connected to the section 23, the rotation of the rotary excavation section 20 is transmitted to the rotor 42.
Further, when the rotation of the rotary excavation unit 20 is stopped and the rotor rotation levers 72a, 72b, 72c are removed, the stator support lever 52 and the stator fixing lever 62 are swung around the support lever support point 51 and the fixed lever support point 61b, respectively. While moving, the RJ 40 can be retracted from the rotation center of the rotary excavation unit 20. At this time, the rotor rotation levers 72a, 72b, and 72c may be stirrable, and the structure of the rotation lever fulcrums 71a, 71b, and 71c and the attaching / detaching means of the rotor 41 are not limited.

(Cutter bit exchange means)
FIG. 5 is a partial cross-sectional view of the cutter bit exchanging means of the shield machine according to the embodiment of the present invention in a side view (this cutter bit exchanging means and device is described in detail in Patent Document 1). )
5, the rotating cylindrical portion 22 has cutter bit supply holes 87a, 87b (not shown) (not shown) (hereinafter not shown) corresponding to the positions of the respective cutter spokes 25a, 25b (not shown). Are collectively referred to as “cutter bit supply holes 87”).

In addition, a cutter bit replacement inner cylinder 81 that slides in a watertight manner on the inner peripheral surface of the rotary cylinder portion 22 is installed inside the rotary cylinder portion 22, and the cutter bit accommodating chamber 82 is provided in the cutter bit replacement inner cylinder 81. Is installed.
In addition, a ring gear (internal gear, whose cross section is indicated by a solid line and a side surface is indicated by a broken line) 811 is formed inside the inner cylinder 81 for exchanging the cutter bit, while the inner side of the rotating cylindrical portion 22 is formed. Is provided with a hydraulic motor 202, and a pinion (external gear) 201 fixed to the output shaft of the hydraulic motor 202 is engaged with the ring gear 811. That is, the ring gear 811, the pinion 221, and the hydraulic motor 202 form an inner cylinder driving device 89.
Therefore, since the hydraulic motor 222 is stopped while the shield machine 100 is excavating, the cutter bit replacement inner cylinder 81 and the rotary inner cylinder part 22 (same as the rotary excavation part 20) are integrated. Rotate. On the other hand, when the excavation is stopped, the ring gear 811 provided inside the cutter bit replacement inner cylinder 81 is rotated by driving the pinion 201 engaged with the ring gear 811 with the hydraulic motor 222 as necessary. Let As a result, the cutter bit replacement inner cylinder 81 slides against the rotating inner cylinder portion 22 that is stopped.

A storage opening 83 for storing the cutter bit 1 in the digging direction is provided on the rear surface side of the cutter bit storage chamber 82, and the storage opening 83 has an opening / closing door 84 for sealing the watertight. Is provided. Further, an extrusion opening 85 (see FIG. 3) for extruding the cutter bit 1 toward the outer peripheral direction is provided on the outer peripheral side of the cutter bit accommodating chamber 82. Further, a cutter bit push-out cylinder 86 for pushing the cutter bit 1 toward the outer peripheral direction is installed on the inner peripheral side of the cutter bit accommodating chamber 82.
Therefore, if the excavation of the shield machine 100 is interrupted and the rotation of the rotary excavation unit 20 is stopped in the following manner, the new cutter bit 1 can be mounted on the rotary excavation unit 20 from the main body unit 10. .

(How to operate the Shield machine)
(I) The cutter bit replacement inner cylinder 81 is rotated so that the extrusion opening 85 is aligned with the position of the cutter pork 25 to which the new cutter bit 1 (referred to as “new cutter bit 1n” for convenience of description) is to be mounted. . At this time, for example, with respect to the cutter pork 25a, the extrusion opening 85 of the cutter bit accommodating chamber 82, the cutter bit supply hole 87a of the rotating cylindrical portion 22, and the cutter bit mounting groove 88a of the cutter pork 25a communicate with each other in a straight line. Yes.
(Ii) Then, the cutter bit fixing cylinder 27 is contracted, and the cutter bit fixing plate 26 is retracted.

(Iii) Then, the cutter bit 1 (referred to as “cutter bit 1a” for convenience of description and indicated by the broken line in the inner periphery for convenience) mounted in the cutter bit mounting groove 88 of the cutter pork 25 is movable. Therefore, the cutter bit push-out cylinder 86 is extended, and a new cutter bit 1n previously accommodated in the cutter bit accommodating chamber 82 is pushed through the extrusion opening 85 and pushed out into the cutter bit mounting groove 88. At this time, the cutter bit 1a arranged on the outermost peripheral side of the cutter bit mounting groove 88 is detached from the cutter bit mounting groove 88 (same as the cutter pork 25) and pushed out into the ground.
(Iv) Therefore, when the cutter bit fixing cylinder 27 is extended and the cutter bit fixing plate 26 is advanced, all the cutter bits 1 (new cutter bits 1n and cutter bits 1a) attached to the cutter spokes 25 are fixed, It will be ready for excavation.
During this time, the cutter bit supply holes 87 (for example, the cutter bit supply holes 87b, 87c) are used in the cutter spokes 25 (for example, the cutter spokes 25b, 25c,...) Other than the cutter spoke 25 to which the new cutter bit 1n is to be mounted. ,... Are sealed in a watertight manner by the cutter bit replacement inner cylinder 81, so that water or the like does not enter the main body 10.

(V) Next, if the cutter bit push-out cylinder 86 is contracted and the cutter bit replacement inner cylinder 81 is slightly rotated, all the cutter bit supply holes 87 are sealed in a watertight manner by the cutter bit replacement inner cylinder 81. The
(Vi) Therefore, the opening / closing door 84 is opened, and another new cutter bit 1n is stored in the cutter bit accommodation chamber 82 via the storage opening 83, and the opening / closing door 84 is closed to remove the cutter bit accommodation chamber 82. Seal watertight.
(Vii) Further, by rotating the cutter bit replacement inner cylinder 81, the extrusion opening 85 is aligned with the position of the cutter pork 25 (for example, the cutter pork 25b) to which the new cutter bit 1n is to be mounted next, If the above process is performed, a new cutter bit can be mounted also in the cutter pork 25.

(Rotary joint position when changing the cutter bit)
FIG. 6 is a partial rear view for explaining the swing of the rotary joint of the shield machine according to the embodiment of the present invention.

FIG. 6A shows a case in which the cutter bit is exchanged for the cutter pork 25a. That is, the rotary excavation unit 20 is rotated, and the rotation is stopped at a position where the cutter pork 25a faces vertically downward (so-called approximately 6 o'clock position). Then, the cutter bit replacement inner cylinder 81 is rotated to bring the extrusion opening 85 close to the cutter pork 25a.
At this time, the cutter bit supply hole 87 of the rotating cylindrical portion 22 and the extrusion opening 85 of the cutter bit replacement inner cylinder 81 do not overlap. That is, since the rotating cylindrical portion 22 closes the cutter bit supply hole 87 in a watertight manner, the watertightness of the cutter bit accommodation chamber 82 is maintained. Since the rotation lever fixing pin 74 is removed, the rotation lever fulcrum 71 of the rotor rotation lever 72 is at the left substantially horizontal position (so-called about 9:30), and the rotor rotation lever 72 is substantially horizontal. It swings until it becomes the posture.

Further, the support lever fixing pin 64 is removed from the support lever fixing hole 53 of the stator support lever 52 and the fixing lever fixing hole 63b of the stator fixing lever 62, and the stator 41 swings rightward in the figure. Has been. At a position where the support lever fixing hole 53a of the stator support lever 52 and the fixing lever fixing hole 63a of the stator fixing lever 62 coincide with each other, the support lever fixing pin 64 is inserted into the fixing holes 53a, 63a, Oscillation is fixed.
Accordingly, the RJ 40 is separated from the rotation center of the rotary excavation unit 20 (same as being at a so-called about 9 o'clock position), and the stator support lever 52 and the rotor rotation lever 72 are retracted above the rotary excavation unit 20. . Therefore, a work space for accommodating the new cutter bit 1 in the cutter bit accommodating chamber 82 is secured.

  FIG. 6B shows a case in which the cutter bit is exchanged for the cutspoke 25b that extends vertically downward. That is, the rotary excavation unit 20 is rotated, and the rotation is stopped at a position where the cutter pork 25b faces vertically downward (so-called about 6 o'clock position). Then, the cutter bit replacement inner cylinder 81 is rotated to bring the extrusion opening 85 close to the cutter pork 25b. At this time, the rotation lever fulcrum 71 of the rotor rotation lever 72 is close to the lower side (so-called about 7 o'clock position), and the rotation lever fixing pin 74 is removed, so that the rotor rotation lever 72 can swing. . And it stands substantially vertically by the swing of the stator 41 described below.

That is, the support lever fixing pin 64 is removed from the support lever fixing hole 53 of the stator support lever 52 and the fixing lever fixing hole 63b of the stator fixing lever 62, and the stator 41 swings leftward in the figure. Has been. Then, at the position where the support lever fixing hole 53c and the fixing lever fixing hole 63c coincide with each other, the support lever fixing pin 64 is inserted into the fixing holes 53c and 63c, and the swing is fixed.
Accordingly, the RJ 40 is separated from the rotation center of the rotary excavation unit 20 (same as being at the so-called about 9 o'clock position), and the stator support lever 52 and the rotor rotation lever 72 are retracted to the left side of the rotary excavation unit 20. Therefore, a work base for accommodating the new cutter bit 1 in the cutter bit accommodating chamber 82 is secured.

FIG. 6C shows a case in which the cutter bit is exchanged for the cutter pork 25c that is directed vertically downward. That is, as described above, the cutter pork 25c and the cutter bit replacement inner cylinder 81 are substantially vertically downward (so-called about 6 o'clock), and the rotary lever fulcrum 71 of the rotor rotary lever 72 is close to the bottom (so-called about 5 Since the rotation lever fixing pin 74 is removed, the rotor rotation lever 72 stands substantially vertically by the swing of the stator 41.
Further, the stator support lever 52 is swung in the right direction in the drawing, and the swing is fixed by a support lever fixing pin 64.
Therefore, the RJ 40 is separated from the rotation center of the rotary excavation unit 20 (same as being at the so-called about 3 o'clock position), and the stator support lever 52 and the rotor rotation lever 72 are retracted to the right side of the rotary excavation unit 20. Therefore, a work space for accommodating the new cutter bit 1 in the cutter bit accommodating chamber 82 is secured.

FIG. 6D shows a case in which the cutter bit is exchanged for the cut-out spoke 25d that extends vertically downward. That is, as described above, the cutter pork 25d and the cutter bit replacement inner cylinder 81 are in a substantially vertically lower position (so-called approximately 6 o'clock position), and the rotation lever fulcrum 71 of the rotor rotation lever 72 is on the right substantially horizontal position (so-called Since the rotary lever fixing pin 74 is removed at the position of about 2:30), the rotor rotation lever 72 is tilted substantially horizontally by the swing of the stator 41.
Further, the stator support lever 52 is swung leftward in the figure, and the swing is fixed by the support lever fixing bin 64.
Accordingly, the RJ 40 is separated from the rotation center of the rotary excavation unit 20 (same as being at a so-called about 9 o'clock position), and the stator support lever 52 and the rotor rotation lever 72 are retracted to the upper side of the rotary excavation unit 20. Therefore, a work space for accommodating the new cutter bit 1 in the cutter bit accommodating chamber 82 is secured.

  As described above, it has been described that the working base is secured for the rotary joint swinging arm 52 (FIG. 4A) of the present invention by taking the work of replacing the cutter bit 1 as an example, but the present invention is limited to this. It is obvious that a work space is secured for other work inside the rotary excavation unit 20 instead of the above.

[Embodiment 2]
FIG. 7 is an explanatory diagram of the rotary joint 101 according to the second embodiment of the present invention and the front end portion of the shield machine equipped with the rotary joint 101. In FIG. 7, the same or corresponding parts as those shown in the first embodiment are denoted by the same reference numerals.
The rotary joint 101 according to the present embodiment swings the rotor 103 and the rotor 103 that rotate the rotor 105 by transmitting the rotation of the rotary excavation unit 20 to the stator 103, the rotor 105, and the rotor 105 toward the main body 10 side. Stator support means 121 that is movably supported, and stator fixing means 129 that stops the swinging of the stator support means 121 and fixes the stator 103 at a predetermined position.
The configurations of the stator 103 and the rotor 105 are the same as those described in the first embodiment. In the following, another configuration that is a feature of the present embodiment will be described in detail.

1. Rotor Rotating Means FIG. 8 is a sectional view taken along the line BB in FIG. Hereinafter, details of the rotor rotating means 107 will be described with reference to FIGS.
The rotor rotation means 107 includes a rotation transmission shaft having one end portion rotatably connected to the rotary excavation portion 20 side and the other end portion removably connected to the rotor 105.
As shown in FIG. 8, one end portion of the rotor rotating means 107 is a circular bulging portion, and a hole 110 for rotation is provided at the center portion, and four bolts are provided at the peripheral portion. A hole is provided. Then, when the vertical direction is 6 o'clock of the timepiece, protrusions protruding outward from the periphery are formed at the 4 o'clock and 8 o'clock positions in the periphery, and bolt holes 111a and 111b are formed in the protrusions. Is provided.

One end of the rotor rotating means 109 is fixed to the fixed plate 113 by four bolts 115a, 115b, 115c, and 115d so as to be sandwiched between the fixed plates 113 provided on the rotary excavation unit 20 side. In addition, a rotation shaft 117 is inserted into the hole 110 so that the rotor rotation means 109 can rotate in a plane orthogonal to the excavation direction.
The other end of the rotor rotating means 109 is detachably connected to the rotor 105 by a plurality of bolts 119.

  In the state indicated by the solid line in FIG. 8, the rotor rotating means 109 configured as described above transmits the rotation of the rotary excavating unit 20 to the rotor 105 when the rotary excavating unit 20 rotates. The rotor 105 rotates together with the rotary excavation unit 20.

  When replacing the cutter bit, the bolt 119 is removed, and the connection between the rotor rotating means 109 and the rotor 105 is disconnected. Then, the bolt 115 is removed and the rotor rotating means 109 is rotated about the rotation shaft 117 to the state indicated by the one-dot chain line in FIG. In this state, the bolt 120 is inserted into the bolt hole 111 a and fixed to the fixing plate 113. Thus, by setting the rotor rotating means 109 to the state indicated by the alternate long and short dash line, it is possible to secure a working space for exchanging the cutter bits.

2. FIG. 9 is a cross-sectional view taken along the line CC of FIG. The details of the stator support means 121 will be described below with reference to FIGS.
The stator support means 121 is composed of a shaft member, and one end portion of the stator support means 121 is connected to the main body portion 10 side of the shield machine so as to be rotatable in a plane orthogonal to the digging direction via the rotation shaft 125, and the other end portion. Are detachably connected to the stator 103 by a plurality of bolts 127.

3. Stator fixing means The stator fixing means 129 includes first link members 131a and 131b extending from the central portion of the shaft of the stator support means 121 to both sides (a direction perpendicular to the digging direction) and both sides of the stator support means 121 ( Second link members 133a and 133b, one end side of which is fixed to the main body 10 side of the shield machine and the other end side extends vertically downward, and the first link member 131a and the second link. It is comprised from the 3rd link member 135 which connects the member 133a.

The state shown in FIG. 9 shows a state in which the central axis of the rotor of the rotary joint 101 and the rotational center of the rotary excavation unit 20 coincide with each other, and the rotary excavation unit 20 can be rotated in this state.
The state shown by the one-dot chain line in FIG. 9 shows a state in which the stator support means 123 is rotated around the rotation shaft 125 and the rotary joint 101 is moved to the inner wall side of the main body 10.

The procedure for changing from the state indicated by the solid line in FIG. 9 to the state indicated by the alternate long and short dash line is as follows. The connection between the third link member 135 and the first link member 131a and the connection between the third link member 135 and the second link member 133a are removed, and the stator support means 123 is rotated about the rotation shaft 125, so that the first The end of the link member 131b is connected to the second link member 133b.
By doing in this way, the rotary joint can be held in a state of being moved to the inner wall side of the main body portion 10, and a work space for exchanging the cutter bit can be secured.

Next, regarding the shield machine equipped with the rotary joint 101 of the present embodiment configured as described above, the operation of moving the rotary joint 101 when the cutter bit is replaced will be described.
In the state shown by the solid lines in FIGS. 7, 8, and 9, the central axis of the rotor of the rotary joint 101 coincides with the rotation center of the rotary excavation unit 20, and the rotary excavation unit 20 can be rotated in this state. it can. Therefore, natural ground can be excavated in this state.

Next, when exchanging the cutter bit, the bolt 119 is removed, and the connection between the rotor rotating means 109 and the rotor 105 is disconnected. Further, the bolt 115 is removed, and the rotor rotating means 109 is rotated about the rotation shaft 117 to the state indicated by the one-dot chain line in FIG. In this state, a bolt is inserted into the bolt hole 111 a and fixed to the fixing plate 113.
Next, the connection of the third link member 135 and the first link member 131a and the connection of the third link member 135 and the second link member 133a in the stator fixing means 23 are removed. Thereby, the stator support means 123 can be rotated. Therefore, the stator support means 123 is rotated around the rotation shaft 125 to connect the end portion of the first link member 131b and the second link member 133b.
As a result, the rotary joint 101 can be held in a state of being moved to the inner wall side of the main body portion 10, and a work space for exchanging the cutter bit can be secured.

  At this time, the rotary joint 101, the rotor rotating means 107, the stator supporting means 123, and the stator fixing means 129 are all arranged on the inner wall side of the main body portion 10, and a wide space is secured in the central portion of the main body portion 10. The work efficiency of exchanging cutter bits can be greatly improved.

  When the work such as exchanging the cutter bit is completed, the state shown by the solid line in FIGS. 7, 8, and 9, that is, the center axis of the rotor of the rotary joint 101 and the center of rotation of the rotary excavation unit 20 are Return to the matching state. In this state, the rotary excavation unit 20 is rotated to excavate natural ground.

  In the above embodiment, the example in which the rotor rotating means 107 and the stator supporting means 123 are rotated counterclockwise in the drawing and moved to the inner wall side of the main body 10 is shown. However, the rotor rotating means 107 and It is also possible to rotate the stator support means 123 clockwise to move to the inner wall side of the main body 10. In this case, the rotor rotating means 107 may be fixed to the fixing plate 113 by rotating the rotor rotating means 107 clockwise and inserting bolts into the bolt holes 111b. Regarding the stator support means 123, the third link member 135 may be removed, and the first link member 131a and the second link member 133a may be connected.

  As described above, according to the present invention, it is possible to secure a work space inside the rotary excavation part, and therefore work at the position, in particular, work for exchanging the cutter bit becomes easy and quick. The present invention can be widely used as various shield machines and methods for operating the shield machines in which hydraulic pressure, electrical signals and the like are transferred between the main body and the rotary excavation unit.

Sectional drawing of the side view which shows the front-end part of the shield machine which concerns on embodiment of this invention. The front view which shows the front-end part of the shield machine which concerns on embodiment of this invention. The elements on larger scale which show the front-end part of the shield machine which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, showing a state in which the stator support means, the stator fixing means, and the rotor rotation means of the shield machine according to the embodiment of the present invention are viewed from the back. The fragmentary sectional view of the side view which shows the cutter bit replacement | exchange means of the shield machine which concerns on embodiment of this invention. The partial rear view explaining rocking | fluctuation of the rotary joint of the shield machine which concerns on embodiment of this invention. Explanatory drawing of the front-end part of the rotary joint which attached the rotary joint which concerns on Embodiment 2 of this invention, and this rotary joint. FIG. 8 is a cross-sectional view taken along the line BB in FIG. 7. FIG. 8 is a cross-sectional view taken along the line CC in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter bit 2 Copy cutter 3 Rotation cutter 4 Main body side hydraulic piping 5 Rotation side hydraulic piping 10 Main body part 11 Skin plate 12 Bulkhead 13 Central opening part 14 Excavation part support mechanism 15 Excavation part 20 Rotation excavation part 21 Rotation End 22 Rotating cylindrical portion 23 Rotating cone portion 24 Rotating base portion 25 Cutter spoke 26 Cutter bit fixing plate 27 Cutter bit fixing cylinder 28 Auxiliary spoke 29 Coby cutter advance / retreat cylinder 30 Rotating drive portion 31 Motor 32 Drive gear 33 Driven gear 40 Rotary joint (RJ )
41 Stator 42 Rotor 50 Stator support means 51 Support lever fulcrum 52 Stator fixing lever (rotary joint swing arm)
53 Support lever fixing hole 60 Stator fixing means 61 Fixed leper fulcrum 62 Stator fixing lever 63 Fixing lever fixing hole 64 Support lever fixing pin 70 Rotor rotating means 71 Rotating lever supporting point 72 Rotor rotating lever 73 Rotating lever fixing hole 74 Rotation Lever fixing pin 75 Rotor guide groove 80 Cutter bit replacement means 81 Cutter bit replacement inner cylinder 82 Cutter bit storage chamber 83 Storage opening 84 Opening door 85 Extrusion opening 86 Cutter bit extrusion cylinder 87 Cutter bit supply hole 88 Cutter Bit mounting groove 89 Inner cylinder driving device 90 Screw conveyor 100 Shield engraving machine 101 Rotary joint 103 Stator 105 Rotor 107 Rotor rotating means 121 Stator supporting means 129 Stator fixing means

Claims (3)

A shield having a main body part, a rotary excavation part that is installed at a front end of the main body part and excavates natural ground while rotating, and a rotary joint that connects at least hydraulic piping between the rotary excavation part and the main body part Digging machine,
The shield machine according to claim 1, wherein the rotary joint is movable from the position of the rotation center of the rotary excavation unit when the rotary excavation unit is stopped. It is attached to a shield machine having a main body part and a rotary excavation part that is installed at the front end of the main body part and excavates natural ground while rotating, and is at least of hydraulic piping between the main body part and the rotary excavation part. A rotary joint for coupling,
A rotary joint configured to be movable from a position of a rotation center of the rotary excavation unit when the rotary excavation unit is stopped. A shield having a main body part, a rotary excavation part that is installed at a front end of the main body part and excavates natural ground while rotating, and a rotary joint that connects at least hydraulic piping between the rotary excavation part and the main body part A method of operating the excavator,
Installing the rotary joint coaxially with the rotational center of the rotary excavation unit;
Rotating the rotary excavation unit in a state where the rotary joint is installed coaxially with the rotation center of the rotary excavation unit;
And a step of moving the rotary joint from the position of the rotation center of the rotary excavation unit while the rotary excavation unit is stopped.

Images