JP5511022B2 - H & V shield machine - Google Patents

Description

  The present invention relates to an H & V shield machine that connects the first and second rear trunks of the first and second excavators and folds the first and second front trunks in opposite directions to make a spiral excavation. About.

Recently, an H & V shield machine that connects the first and second rear trunks of the first and second excavators and folds the first and second front trunks in opposite directions and digs in a spiral shape is practical. It has become.
The H & V shield excavator described in Patent Document 1 is obtained by connecting the first and second excavators. The first and second excavators are respectively connected to the first and second front trunk parts and the first and second rear trunk parts connected to the rear end sides of the first and second front trunk parts so that they can be folded. The first and second rear torso parts are integrally connected so as to form glasses, and the first and second front torso parts are respectively located in the first and second rear torso parts. A plurality of middle folding jacks are provided for folding. Middle portions in the length direction of the first and second front body portions are connected so as to be capable of being folded in opposite directions via joint pins inserted into arc-shaped elongated holes elongated in the middle folding direction.

In this H & V shield machine, when the tunnel is dug while controlling the rolling angle, the shield is based on the bending angle between the axis of the rear trunk and the axis of the front trunk as the rolling angle changes. The position of the center of rolling of the excavator is detected and controlled.
A typical shield machine is equipped with at least a plurality of shield jacks, an erector device that covers the inner surface of the tunnel, a work deck, and the like.

  Patent Document 1 does not describe any earth discharging device for discharging excavated earth and sand, but generally, a shield machine is equipped with a muddy water type or muddy type earth discharging device. For example, in the case of a muddy drainage device, the water supply pipe is connected to the upper end of the outer periphery of the chamber on the back of the cutter head, and the mud discharge pipe is connected to the lower end of the outer peripheral portion of the chamber. ing.

Japanese Patent No. 3217710

  In the H & V shield machine, since the shield machine rolls and changes its posture according to the spiral excavation, the water pipe and the mud pipe also roll and the posture changes. Therefore, if the spiral angle of spiral excavation exceeds a certain angle, the connection port of the mud pipe will shift upward from the bottom of the chamber, and mud cannot be drained from the bottom of the champer. Etc. will stay. As a result, there is a problem that the mud function of the discharge device is lowered or stopped, and tunnel excavation cannot be performed smoothly.

  An object of the present invention is to provide an H & V shield machine capable of reliably maintaining the mud draining function even if the attitude of the shield machine changes according to spiral excavation.

The H & V shield machine according to claim 1 is a H & V shield machine capable of spiral digging, wherein a first front body portion having a cutter head at a front end portion and the first front body portion are connected so as to be able to be bent halfway. A second excavator having a first excavator having a trunk, a second front trunk having a cutter head at the front end, and a second rear trunk connected to the second front trunk so as to be able to be folded. And connecting means for connecting the first and second rear body parts so that the first and second front body parts can be folded in opposite directions, and inside each of the first and second excavators. Each drainage pipe is provided with a plurality of drainage pipes that are branched from the drainage main pipe and connected to a portion near the outer periphery of the chamber on the back side of the front barrel portion. Mud branch pipes that are connected to the chamber at a position spaced apart by a predetermined angle in the circumferential direction. It is characterized in that a branch pipes.

  In the first half of the spiral excavation, mud is discharged from the first drainage branch pipe that can be drained from the bottom of the chamber or the vicinity thereof, and the spiral angle reaches the set angle and the first drainage branch pipe enters the chamber. In the second half of the spiral excavation, when the connection port becomes higher than the connection port to the chamber of the second exhaust mud branch pipe, switching to the exhaust mud from the second exhaust mud branch pipe, The mud function by the mud pipe can be maintained by draining the mud from the second mud branch pipe.

According to a second aspect of the present invention, there is provided an H & V shield machine according to the first aspect, wherein when the first and second excavators are in a horizontal dual attitude, each of the first and second excavators has a plurality of sludge branch pipes. At least one of these is positioned so as to be able to drain mud from a portion near the bottom of the chamber, and the plurality of mud draining branch pipes are spaced apart by a predetermined angle of 80 to 100 degrees in the circumferential direction.
The direction away from the predetermined angle is away from the at least one drainage branch pipe in a direction opposite to the spiral excavation direction.

  The H & V shield machine according to claim 3 is the invention according to claim 2, wherein a branch pipe opening / closing means for opening / closing the waste mud branch pipe provided in each of the waste mud branch pipes, and a spiral shape with the H & V shield machine A spiral angle detecting means for detecting a current spiral angle that has been spirally rotated from the start of spiral excavation, and a discharge control for switching and controlling a plurality of branch pipe opening / closing means based on the spiral angle detected by the spiral angle detecting means. It is provided with mud control means.

  The H & V shield machine according to claim 4 is the invention according to any one of claims 1 to 3, further comprising a water pipe provided inside each of the first and second machines, each of the water pipes Is a water supply main pipe and a plurality of water supply branch pipes branched from the water supply main pipe and connected to a portion near the outer periphery of the chamber, and a plurality of water supply branch pipes connected to the chamber at positions separated by a predetermined angle in the circumferential direction. It is characterized by having a water supply branch pipe.

  The H & V shield machine according to claim 5 is the invention according to claim 4, wherein when the first and second excavators are in a horizontal duplex attitude, each of the first and second excavators has a plurality of water supply branch pipes. At least one of the plurality of water supply branch pipes is located at a predetermined angle of 80 to 100 degrees in the circumferential direction, and is located at a position near the upper end of the chamber in the front body portion so that water can be supplied.

  In the first aspect of the present invention, a sludge pipe is provided in each of the first and second excavators of the H & V shield machine, and each of the sludge pipes includes a main sludge pipe and the main sludge pipe. A plurality of waste mud branch pipes that branch and are connected to the outer peripheral portion of the chamber on the back side of the front body portion are connected to the chamber at positions spaced apart by a predetermined angle in the circumferential direction. Therefore, in the first half of the spiral excavation, mud is discharged from the first drainage branch pipe that can drain from the bottom of the chamber or the vicinity thereof, and the spiral angle reaches the set angle and the chamber of the first drainage branch pipe In the second half of the spiral excavation, when the connection port to the second drainage branch pipe is higher than the connection port to the chamber of the second drainage branch pipe, switching to the waste mud from the second drainage branch pipe Can drain mud from the second mud branch pipe, spiral Over the whole period of advance can be reliably maintained hydro function by discharging mud tube.

  According to the second aspect of the present invention, when the first and second excavators are in the horizontal duplex posture, in each of the first and second excavators, at least one of the plurality of sludge branch pipes is a bottom portion of the chamber. Since the plurality of drainage branch pipes are located apart from each other by a predetermined angle of 80 to 100 degrees in the circumferential direction, at least one drainage branch pipe is provided in the horizontal dual-position. Thus, the sludge can be discharged from the portion near the bottom of the chamber, and then the sludge is discharged from the portion near the bottom of the chamber or the vicinity thereof by the at least one drainage branch pipe until the spiral angle of the spiral excavation reaches about 45 °. After the time when the spiral angle of the spiral excavation reaches about 45 °, the mud can be drained from the portion near the bottom of the chamber or its vicinity by another drainage branch pipe.

  In the invention of claim 3, the branch pipe opening / closing means provided on each drainage branch pipe for opening and closing the waste mud branch pipe, and the spiral rotation from the spiral excavation start time when excavating spirally with the H & V shield machine The spiral angle detection means for detecting the current spiral angle and the mud control means for switching and controlling the plurality of branch pipe opening / closing means based on the detected spiral angle are provided. The mud function can be maintained by closing the branch pipe opening / closing means of the mud branch pipe that has become mud-unable, and opening the branch pipe opening / closing means of the mud branch pipe that can be mud.

  According to a fourth aspect of the present invention, a water supply pipe provided inside each of the first and second excavators is provided, and each of the water supply pipes is branched from the water supply main and the water supply main and close to the outer periphery of the chamber. A plurality of water supply branch pipes connected to the part, and are provided with a plurality of water supply branch pipes connected to the chamber at positions spaced apart by a predetermined angle in the circumferential direction, and therefore move downward as the spiral excavation progresses The water supply from the water supply branch pipe is stopped, and the water supply branch pipe moved upward can be switched to supply water.

  According to a fifth aspect of the present invention, when the first and second excavators are in a horizontal dual-position, in each of the first and second excavators, at least one of the plurality of water supply branch pipes is a chamber in the front trunk portion. The plurality of water supply branch pipes are positioned at a predetermined angle of 80 to 100 degrees in the circumferential direction while being positioned so as to be able to supply water near the upper end. Therefore, in the horizontal duplex position, water can be supplied from the portion near the upper end of the chamber by at least one water supply branch pipe, and then the at least one water supply branch pipe until the spiral angle of spiral digging reaches about 45 °. Water can be supplied to the upper end portion of the chamber or the vicinity thereof, and after the spiral angle of the spiral excavation reaches about 45 °, the water is supplied to the upper end portion of the chamber or the vicinity thereof by another water supply branch pipe. be able to.

It is a perspective view of the shield machine and spiral tunnel of the Example of this invention. It is a perspective view of the shield machine of a horizontal duplex posture. It is a perspective view of a shield machine when a spiral digging angle is 45 degrees. It is a perspective view of the shield machine of the vertical double posture. It is a cross section of the shield machine of a horizontal double posture. It is a front view of the cutter head of the shield machine of a horizontal duplex posture. It is a longitudinal cross-sectional view of a 1st excavation machine. It is a schematic longitudinal cross-sectional view of the shield machine of a horizontal duplex attitude | position. It is a schematic rear view of the shield machine of a horizontal duplex posture. It is a schematic longitudinal cross-sectional view which shows the water supply system and drainage system of the shield machine of a horizontal duplex attitude | position. FIG. 10 is a view corresponding to FIG. 9 when the spiral excavation angle is 45 degrees. FIG. 11 is a view corresponding to FIG. 10 when the spiral excavation angle is 45 degrees. FIG. 10 is a view corresponding to FIG. 9 in a vertical duplex posture. FIG. 11 is a view corresponding to FIG. 10 in a vertical duplex posture. It is a block diagram of a control system. It is a part of flowchart of spiral excavation control. It is the remainder of the flowchart of spiral excavation control. It is explanatory drawing explaining the calculation method of a bending angle. It is explanatory drawing explaining the calculation method of the target stroke of a bending jack. It is explanatory drawing explaining the calculation method of the target stroke of a shield jack.

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated based on an Example.
In addition, an Example is only an example and this invention is not limited to the structure of an Example.

  This H & V shield machine SM (hereinafter referred to as shield machine) is a shield machine for excavating a spiral tunnel T as shown in FIG. In this embodiment, a case where the total spiral digging distance from the digging start position to the digging end position is 125 m and the total spiral angle is 90 degrees will be described as an example. However, the present invention is also applicable to the case where the total spiral excavation distance is a distance other than 125 m, or the total spiral angle is less than 90 degrees or more than 90 degrees.

  As shown in FIG. 2, the shield machine SM is formed by connecting first and second machines 1A and 1B in parallel. As shown in FIG. 1, the shield machine SM1 at the excavation start position has a horizontal dual attitude in which the first and second excavators 1A and 1B are arranged side by side in the horizontal direction on the left and right (this is the reference attitude). It is. From this horizontal duplex position, spiral digging counterclockwise toward the digging direction, and the shield digging machine SM2 at the intermediate position of the spiral digging has the second digging machine 1B diagonally right above the first digging machine 1A. In this intermediate posture, the plane connecting the axial centers of the first and second rear trunks 4A and 4B of the first and second excavators 1A and 1B is a horizontal plane. It is inclined 45 degrees with respect to. Further, the shield machine SM3 at the end position of the excavation is in a vertical double position in which the second excavator 1B is positioned directly above the first excavator 1A (FIG. 1, FIG. 1). 4).

Next, a basic configuration of the shield machine SM will be described with reference to FIGS.
FIGS. 5 to 9 show the shield machine SM in the horizontal dual attitude (reference attitude), and in the description based on FIGS. 5 to 9, the excavation direction is the front and the left and right when facing the front The direction is the left-right direction. The first engraving machine 1A of the shield machine SM includes a cutter head 2A at a front end, a head rotation driving device 5 that rotationally drives the cutter head 2, a first front trunk 3A, and a first front trunk. The first rear trunk 4A to which 2 can be folded, a plurality of middle folded jacks 6, a plurality of shield jacks 7, a water supply pipe 8, a sludge pipe 9, and a tunnel inner surface are covered with a segment S. A first erector apparatus 10A to be worked, a first work deck 11A, and a shape holding device 12 mounted on the work deck 11A are provided.

Next, the cutter head 2A will be described.
As shown in FIG. 6, in the cutter head 2A, a plurality of cutter bits 2b are respectively provided at the front ends of a plurality of cutter spokes 2a arranged in a radial pattern, and a copy cutter 2c is provided at the tip of some cutter spokes 2a. A center cutter 2d is provided at the center. A shaft member 15 extending from a swivel joint 14 attached to the partition wall 13 is connected to the cutter head 2.

  Next, the middle folding mechanism 16 that connects the first front trunk 3A to the front end of the first rear trunk 4A so that it can be folded will be described. As shown in FIGS. 5 and 7, an annular spherical seat member 16a having a spherical seat on the outer surface is disposed at the boundary between the first front barrel portion 3A and the first rear barrel portion 4A. Is fixed to the inner peripheral surface of the front end portion of the first rear body portion 4A. A steel annular seal member 16b that is in fluid-tight sliding contact with the front half of the spherical seat is fixed to the inner peripheral surface of the rear end portion of the first front body portion 3A. A tail seal 4a is provided at the rear end of the first rear body 4A.

Next, the structural members (frames belonging to the excavator main body) inside the first excavator 1A will be described. As shown in FIG. 7, a chamber 17A is formed on the rear side of the cutter head 2A in the first front body portion 3A, and a partition wall 13 for partitioning the rear end of the chamber 17A is provided.
A vertical annular plate frame 18 is provided behind the partition wall 13 at a predetermined interval, and an outer peripheral end of the annular plate frame 18 is joined to the first front body 3A. An inner cylindrical annular plate 20 and an outer cylindrical annular plate 21 are provided between the partition wall 13 and the annular plate frame 18, and both ends of the annular plates 20 and 21 are connected to the partition wall 13 and the annular plate frame 18. It is joined.

  As shown in FIGS. 7 and 8, an annular frame 22 forming a closed cross section is fixed to the inner peripheral surface of the spherical seat member 16a. An upper chord member 23 that forms a closed cross section is fixed to the inner surface of the upper end portion of the annular frame 22, and a lower chord member 24 that forms a closed cross section is fixed to the inner surface of the lower end portion of the annular frame 22.

Inside the annular frame 22, a pair of left and right vertical columns 25 are arranged at predetermined intervals in the left and right direction, the upper ends of both columns 25 are joined to the upper chord member 23, and the lower ends of both columns 25 are the lower chord members. 24. An upper connecting member 26 is attached to the upper part of the left and right columns 25, and a lower connecting member 27 is attached to a portion near the lower ends of the left and right columns 25.
A cylindrical annular body 28 extending backward by the same width from a cylindrical annular plate on the inner peripheral side of the annular frame 22 is provided, and the annular body 28 is formed by a plurality of rib plates 28a provided at predetermined intervals in the circumferential direction. It is joined to the first rear body 4A.

Next, the folded jack 6 will be described.
As shown in FIG. 7, a plurality of (for example, 14) middle-folded jacks 6 are disposed at a substantially interval in the circumferential direction on the inner diameter side of the shield jack 7 in the first front body portion 3A. The cylinder body 6a of the folding jack 6 is connected to a connecting piece 6b fixed to the annular plate frame 18 via a spherical joint so as to be rotatable in all predetermined small angles, and the tip of the rod 6c of the folding jack 6 is A connecting piece 6d fixed to the annular frame 22 is connected via a spherical joint so as to be rotatable in all predetermined small angles. A stroke sensor 71 capable of detecting the stroke (the amount of extension of the rod) of the folded jack 6 by a magnetostrictive element is incorporated in the cylinder body 6a of each folded jack 6 and the detection signal is output to the control unit 70A. (See FIG. 15). Therefore, the first front body part 3A can be bent at any small angle in all directions with respect to the first rear body part 4A by the middle folding mechanism 16 and the plurality of middle folding jacks 6.

Next, the head rotation driving device 5 will be described.
As shown in FIG. 7, the head rotation drive device 5 is disposed in the vicinity of the rear side of the partition wall 13 and a plurality of connecting members 30 extending rearward from the cutter head 2 </ b> A, and is connected to the rear ends of the plurality of connecting members 30. The annular member 31, seal mechanisms 31 a and 31 b for lubricating and sealing the inner and outer peripheral sides of the annular member 31, and a common shaft center connected to the annular member 31 and the shaft center of the first front body portion 3A. And a plurality of (for example, eight sets) rotational drive units 5b for rotationally driving the ring gear 5a.

  The ring gear 5 a is rotatably supported by an annular gear support member 5 c by front and rear thrust bearings and an inner peripheral radial bearing, and the gear support member 5 c is fixed to the outer peripheral surface of the annular plate 20. Each rotation drive unit 5b includes a pinion 5d meshed with the ring gear 5a, and an electric motor 5e and a speed reducer 5f that rotationally drive the pinion 5d. The plurality of rotation drive units 5 b are attached to the annular plate frame 18. Accordingly, when the ring gear 5a is rotationally driven by the plurality of rotational drive units 5b, the rotation of the ring gear 5a is transmitted to the cutter head 2 through the annular member 31 and the plurality of connecting members 30, and the cutter head 2A is rotationally driven to thereby rotate the face. Drilling is performed.

Next, the shield jack 7 will be described.
As shown in FIGS. 5, 7, and 9, there are a plurality (for example, 20) of shield jacks 7 on the outer peripheral side inside the rear part of the first front body part 3 </ b> A and the front end part of the first rear body part 4 </ b> A. Are arranged so as to be able to advance in the rearward direction and the rod 7b. Each shield jack 7 passes through the annular frame 22, the cylinder body 7 a is fixed to the annular frame 22, and the hemispherical portion 7 c of the front end portion of the cylinder body 7 a is fixed to the spherical seat of the spherical seat member 7 d fixed to the annular plate frame 18. The spreader 7f is connected to the eccentric fitting 7e that is engaged and fixed to the tip of the rod 7b, and the hemispherical portion of the eccentric fitting 7e is engaged with the spherical seat of the spreader 7f. Each shield jack 7 has a built-in stroke sensor 72 using a magnetostrictive element. The stroke sensor 72 can detect the stroke of the shield jack 7 (the amount of rod extension). The detection signal is output to the control unit 70A (see FIG. 15).

Next, the water supply pipe 8 and the mud drain pipe 9 will be described.
As shown in FIGS. 5, 7, and 10, the water supply pipe 8 includes a water supply main pipe 8a and two water supply branch pipes 8b and 8c branched from the water supply main pipe 8a. The water supply main pipe 8a is disposed in the center of the first front body portion 3A and the first rear body portion 4a in a straight shape in the front-rear direction so as to pass through a ring gear 40 and an annular plate 42 which will be described later. A water supply hose (not shown) extending from the ground is connected to the rear end of the pipe 8A.

  One water supply branch pipe 8b is branched from the water supply main pipe 8a and connected to the upper end of the portion near the outer periphery of the chamber 17, and the other water supply branch pipe 8c is branched from the water supply main pipe 8a. The water supply branch pipe 8c is connected to the right end portion of the outer peripheral portion, and the water supply branch pipe 8c is only a predetermined angle of 80 to 100 degrees in the clockwise direction with respect to the water supply branch pipe 8b in FIG. The front ends of the water supply branch pipes 8b and 8c are connected to the chamber 17 at a position spaced in the circumferential direction by the predetermined angle. The water supply branch pipes 8b and 8c are respectively provided with on-off valves 8d and 8e that are opened and closed by an electric actuator.

  As shown in FIGS. 7 and 10, the drainage pipe 9 includes a drainage main pipe 9a, two drainage branch pipes 9b and 9c branched from the drainage main pipe 9a, and a preliminary waste mud branch pipe 9d. It has. The drainage main pipe 9a is disposed in a straight shape in the front-rear direction so as to pass through a ring gear 40 and an annular plate 42, which will be described later, at the center of the first front barrel portion 3A and the first rear barrel portion 4A. A drain hose (not shown) extending from the ground is connected to the rear end of the mud pipe 9a. In addition, an open / close valve 9e that is driven to open and close by an electric actuator is interposed in a connection pipe that connects the water supply main pipe 8a and the exhaust mud main pipe 9a.

  One of the sludge branch pipes 9b is branched from the sludge main pipe 9a and connected to the lower end portion of the outer peripheral portion of the chamber 17A, and the other waste mud branch pipe 9c is of the outer peripheral portion of the chamber 17A. It is connected to the left end. The preliminary mud branch pipe 9d branches from the mud branch pipe 9c and extends in parallel at a small interval, and is connected to the left end portion of the outer peripheral portion of the chamber 17A. The sludge branch pipe 9c is located at a predetermined angle of 80 to 100 degrees (90 degrees in this embodiment) clockwise in the circumferential direction with respect to the sludge branch pipe 9b in FIG. The front end portions of 9b and 9c are connected to the chamber 17A at a position separated in the circumferential direction by the predetermined angle. The preliminary waste mud branch pipe 9d is juxtaposed in the clockwise direction with respect to the waste mud branch pipe 9c. On / off valves 9f, 9g, and 9h that are driven to open and close by an electric actuator are interposed in the drainage branch pipes 9b and 9c and the preliminary drainage branch pipe 9d.

Next, the first erector device 10A will be described.
As shown in FIGS. 7 and 8, the first erector device 10A includes a ring-shaped rotary drum 30 having a common axis with the axis of the first rear body 4A, and the rotary drum 30 is rotatable. A support mechanism that supports the annular body 28 and an erector frame 32 that is supported by the rotary drum 30 so as to be movable in the radial direction with respect to the axis of the first rear body 4A by a pair of left and right hydraulic cylinders 31 and is curved. An erector frame 32 including a member 33 and a guide member 34 extending horizontally rearward from the central portion of the bending member 33, a segment gripping mechanism 35 equipped to the guide member 34 so that the position in the front-rear direction can be adjusted, and the like are provided. .

  An annular projecting portion 30a fixed to the outer peripheral portion of the rotating drum 30 is supported by a plurality of idler rollers 36 provided on the inner peripheral portion of the annular body 28, and the position in the front-rear direction is regulated. The drum rotation driving means for rotating the rotary drum 30 includes a chain member 37 fixedly provided on the outer peripheral surface of the rotary drum 30, a plurality of sprockets 38 meshed with the chain member 37, and the plurality of sprockets 38. Each of them is composed of a plurality of electric motors 78 that are rotationally driven (see FIG. 15).

Next, the first work deck 11A will be described.
As shown in FIGS. 7 to 9, a ring gear 40 having a common center with the axis of the first rear body 4 </ b> A is supported on the rear surfaces of the pair of left and right columns 25, the upper connecting member 26, and the lower connecting member 27. An annular frame 41 having a diameter smaller than the inner diameter of the rotary drum 30 is fixed, and a ring gear 40 is rotatably supported on the annular frame 41 via a thrust bearing and a radial bearing. An annular plate 42 and a pair of left and right plate members 43 are fixed to the rear surface of the ring gear 40, and a first work deck 11 </ b> A extending in a cantilevered manner rearward is fixed to the front surface of these plate members 43.

The first work deck 11A includes a pair of high-rigid left and right girder members 44 that penetrate the inside of the rotary drum 30 and extend horizontally rearward, and left and right 1 attached to the left and right outer sides of the rear half of these girder members 44. It is composed of a pair of reinforcing girder members 45 and a deck plate 46 spanning the left and right girder members 44 and the reinforcing girder 45. The front ends of the left and right girder members 44 are joined to the front surfaces of the left and right plate members 43, and the left and right girder members 44 extend rearward from the rear end of the first rear trunk 4A. Overhang portions 47 are formed to project to the left and right outside of the second half of the first work deck 11A. Note that a trap 48 is provided at the left and right ends of the rear end of the first work deck 11A. As described above, the first work deck 11A is fixed to the ring gear 40 that is rotatably supported around the axis of the first rear body 4A. Yes.

The first deck rotation driving means 50A that rotationally drives the first work deck 11A includes the ring gear 40, a plurality of pinions 51 that mesh with the inner teeth of the ring gear 40, and a plurality of electric motors that rotationally drive the plurality of pinions 51, respectively. A motor 52 and the like are provided.
Furthermore, a first deck rotation angle detection means 53 is provided for detecting the rotation angle of the first work deck 11A with reference to the posture of the first work deck 11A when the shield machine SM is in the reference posture. The first deck rotation angle detection means 53A includes a pinion 54 that meshes with the internal teeth of the ring gear 40, and a rotary encoder 55 that detects the rotation angle of the pinion 54.

  As described above, the first work deck 11A has the frame (the pair of support columns 25, the upper connecting material 26, and the lower connecting material 27) of the first rear body portion 4A on the inner diameter side of the rotating drum 30 of the first elector device 10A. ), The first elector device 10A does not interfere with the first work deck 11A when the segment S is assembled.

Next, the shape holding device 12 will be described.
As shown in FIGS. 7 and 9, rail members 56 are respectively fixed on the first work deck 11 </ b> A above the left and right reinforcing girders 45, and a wheeled carriage 57 that moves on these rail members 56. The carriage 57 is provided with a telescopic member 58 that can be expanded and contracted by a hydraulic cylinder, and an arc member 59 is bridged between the upper ends of the left and right elastic members 58. The arc member 59 has a shape that comes into contact with the inner surface of the segment S, and is configured to support the segment S on the upper end side of the tunnel immediately after the lining and hold the shape. The shape holding device 12 can be moved back and forth by a horizontal hydraulic cylinder 60 connected to the rear end of the first work deck 11A.

Next, the second excavator 1B will be described.
As shown in FIG. 5, in order to prevent the cutter heads 2A and 2B of the first and second excavators 1A and 1B from interfering with each other, in the second excavator 1B, the longitudinal width of the chamber 17B is set to the chamber of the first excavator 1A. By making it narrower than the front and rear width of 17A, the cutter head 2B of the second engraving machine 1B is arranged at a position slightly retracted from the cutter head 2A of the first engraving machine 1A. Except for the above points, the first and second excavators 1A and 1B have the same configuration. Therefore, main members and components will be briefly described, and other identical components will be denoted by the same reference numerals and description thereof will be omitted.

  The second excavator 1B includes a second front trunk 3B having a cutter head 2B at the front end, a second rear trunk 4B connected to the second front trunk 3B so as to be able to be folded, a second erector device 10B, It has a second work deck 11B, a second deck rotation drive means 50B, a second deck rotation angle detection means (not shown), and the like. A connecting portion 29 (corresponding to a connecting means) that welds and connects the first and second rear body portions 4A and 4B in the longitudinal direction so that the first and second front body portions 3A and 3B can be bent in opposite directions. ) Is provided.

Next, a control system of the first excavator 1A will be described.
As shown in FIG. 15, a control unit 70A including a microcomputer including a CPU, a ROM and a RAM, an input / output interface, a power supply circuit, and the like is provided. The control unit 70A includes a plurality of stroke sensors 71 of the middle folding jack 6. Detection signal, a detection signal from the stroke sensor 72 of the plurality of shield jacks 7, a detection signal from the first deck rotation angle detection means 53A, a command signal from the operation panel 79, and the like.

  The control unit 70A includes a cutter head drive unit 73 that drives a plurality of electric motors 5e that rotationally drive the cutter head 2A, an electromagnetic control valve that controls the hydraulic pressure supplied to the plurality of intermediate folding jacks 6 and the like. A jack drive unit 74; a shield jack drive unit 75 including an electromagnetic control valve for controlling oil pressure supplied to the plurality of shield jacks 7; a first deck rotation drive unit 76 for driving the electric motor 52 for deck rotation; Control signals are sent to the rotary drum drive unit 77 that drives the electric motor 78 of the first elector device 10A, the valve drive units 79 to 84 that drive the on-off valves 8d, 8e, and 9e to 9h for the water supply system and the drainage system, respectively. It is configured to allow output. Although the control system of the second excavator 1B has the same configuration and is not illustrated, signals can be exchanged between the control unit 70A of the first excavator 1A and the control unit 70B of the second excavator 1B. . In FIG. 15, the power supply system and the hydraulic pressure supply system are not shown. The second excavator is also provided with a similar control system.

Next, the spiral excavation control executed in the control unit 70A of the first excavator 1A and the control unit 70B of the second excavator 1B is based on the flowcharts of FIGS. 16 and 17 and the explanatory diagrams of FIGS. explain.
This spiral excavation control includes control for a plurality of middle folding jacks 6, control for a plurality of shield jacks 7, control for the first and second work decks 11A and 11B, and control for a water supply system and a drainage system. In the flowchart, Si (i = 1, 2,...) Indicates each step.

  In this embodiment, the total spiral digging distance L from the digging start position to the digging end position is, for example, 125 m, the total spiral angle from the digging start position to the digging end position is, for example, 90 °, and the spiral direction of the spiral digging is As shown in FIG. 1, an example will be described in which the width in the tunnel axial direction of the segment S (digging direction width) is 0.6 m in the counterclockwise direction toward the dug direction.

  When this control is started, initial setting is executed first. In this initial setting, the RAMs of the control units 70A and 70B are cleared, and the plurality of middle folding jacks 6 and the plurality of shield jacks 7 of the first and second excavating machines 1A and 1B are brought into an initial state in which they are maximally contracted, The first and second work decks 11A and 11B are maintained in a horizontal posture, and the first and second excavators 1A and 1B are set to supply water from the water supply branch pipe 8b of the water supply pipe 8, and the mud discharge pipe 9 9b is discharged, and the cutter heads 2A and 2B are in the initial state.

  Next, in S1, the spiral angle Sp per unit digging distance (1 m) is calculated based on the total spiral digging distance L (= 125 m) and the total spiral angle 90 °. Next, in S2, a middle folding angle θ that causes the first and second front body portions 3A, 3B to be folded in opposite directions (the first front body portion 3A downward and the second front body portion 3B upward) and The target strokes of the plurality of middle folding jacks 6 are calculated. A method of calculating the bending angle θ will be described with reference to FIG.

FIG. 18 shows a state in which a unit distance (1 m) spiral digging from the digging start position (first and second digging machines 1A and 1B shown by solid lines) (first and second digging machines shown by chain lines), and this unit The spiral angle Sp at the time of distance digging is as follows.
Sp = 90 ° / 125 m = 0.5 π (rad) / 125 (m) = 0.126 (rad / m)
Assuming that the axial center Oz of the first front body 3A is moved to Ozm by the above-described spiral excavation of unit distance, the spiral angle Sp is a very small value, so the distance δ from Oz to Ozm is δ = Sp × R. However, R is the radius (m) of the first front body 3A.
The bend angle θ can be expressed as tan θ = δ (m) / 1 (m) = δ. For example, if R = 2.5 m, θ = 1.8 °.

  Next, the target strokes of the plurality of intermediate folding jacks 6 of the first excavator 1A can be calculated by the method shown in FIG. Assuming that 14 middle folding jacks 6 are arranged as shown in the figure, assuming that the radius of a circle connecting the axial centers of a plurality of middle folding jacks 6 is Rn, the middle folding angle θ and each middle folding jack 6 Based on the circumferential position, the target stroke of the folding jack 6 can be calculated as shown. By extending the rods of the plurality of middle folding jacks 6 by the target stroke, the first front body 3A can be folded downward.

  FIG. 19 shows only the left half middle folded jack 6, but the left half middle folded jack 6 and the right half middle folded jack 6 are symmetrical with respect to the center line Y. In the second excavator 1B, the second front trunk 3B is bent upward, so that the target stroke obtained by inverting the center line X in FIG. . By extending the rods of the plurality of middle folding jacks 6 by the target stroke, the second front body 3B can be folded upward.

  Next, in S4, the first and second excavators 1A and 1B drive the plurality of middle folding jacks 6 to the target stroke while reading the detection signals of the stroke sensors of the plurality of middle folding jacks 6. Next, in S5, the target strokes of the plurality of shield jacks 7 of the first excavator 1A are calculated as shown in FIG. Assuming that 20 shield jacks 7 are arranged as shown in the figure, assuming that the radius of a circle connecting the axes of the plurality of shield jacks 7 is Rs, the bending angle θ and the circumferential direction of each shield jack 7 are Based on the position, the digging direction width of the segment S (600 mm), and a predetermined additional stroke for work β (for example, β = 100 mm), the target stroke of the plurality of middle-folding jacks 7 can be calculated as shown in the figure. it can.

  Although only the left half shield jack 7 is shown in FIG. 20, the left half shield jack 7 and the right half shield jack 7 are symmetrical with respect to the center line Y. In the second excavator 1B, the target stroke of the plurality of shield jacks 7 is set to a target stroke obtained by inverting the center line X in FIG. 20 in order to bend the second front trunk 3B upward.

  Next, in S6, a segment ring number counter N that counts the number of rings of the lining segment S is initialized to “0”, and the deck rotation angle Ad rotated from the reference posture is set to “0”. Initial setting.

  Next, in S7, stroke excavation by the first and second excavators 1A and 1B is started or continued. In this case, the first and second cutter heads 2A and 2B are rotationally driven by the plurality of electric motors 5e, respectively. Next, in S8, the detection signals of the stroke sensors of the plurality of shield jacks 7 of the first and second excavators 1A and 1B are read. In S9, it is determined whether or not the plurality of shield jacks 7 of the first and second excavators 1A and 1B have reached their target strokes. If the determination is No, the process returns to S7, and S7 to S9 are repeated. When the plurality of shield jacks 7 reach their target strokes, the process proceeds to S10.

  Next, in S10, the excavation of the first and second excavators 1A and 1B is stopped, and the construction of segments for one ring is executed by the first and second elector apparatuses 10A and 10B. In this case, the 1st, 2nd excavator 1A, 1B controls 1st, 2nd elector apparatus 10A, 10B through manual operation from the operation panel 79. FIG. When constructing the segment for one ring, the assembly of the segment S is repeated a plurality of times after the rods of the plurality of shield jacks 7 corresponding to one segment S are contracted to the maximum state. To construct a segment for one ring. Next, in S11, the counter N is incremented by “1”.

Next, in S12, the value of the counter N is multiplied by 0.6 m to calculate the spiral digging distance, and the spiral digging distance is multiplied by the spiral angle Sp per unit digging distance to start spiraling from the start of digging. The excavated spiral angle Asp is calculated.
Next, in S13, the plurality of electric motors 52 for rotating the first and second work decks 11A and 11B are driven based on the current spiral angle Asp and the deck rotation angle Ad stored in the memory. The first and second work decks 11A and 11B are rotated by an angle ΔA = (Asp−Ad) by rotating the first and second work decks 11A and 11B in the direction opposite to the spiral excavation direction (clockwise direction). Adjust the posture to a horizontal posture. Next, in S14, the deck rotation angle Ad is incremented to (Ad + ΔA).

  Next, in S15, it is determined whether or not the spiral angle Asp≈45 °. If the determination is No, the process proceeds to S17, and if the determination is Yes, the process proceeds to S16. In S16, the on / off valves 8d and 8e of the water supply pipe 8 are switched to supply water from the water supply branch pipe 8c, and the on / off valves 9f, 9g and 9h of the mud pipe 9 are switched to switch the drain mud branch pipes 9c and 9d. Switch to drain from. FIG. 11 shows the first and second work decks 11A and 11B when the spiral angle Asp≈45 °, and FIG. 12 shows the first and second excavations when the spiral angle Asp≈45 °. The water supply system and the mud discharge system in the machines 1A and 1B are shown.

Next, in S17, whether or not the value of the counter N has reached the number of segment rings Nset (for example, Nset = 125 m / 0.6 m≈208) constructed before the end of spiral excavation, or the current spiral angle Asp is It is determined whether or not the angle is 90 °. If the determination is No, S7 to S17 are repeatedly executed. When the spiral digging end position is reached and the determination in S17 is Yes, the spiral digging control is terminated.
FIG. 13 shows the first and second work decks 11A and 11B in the vertical duplex posture, and FIG. 14 shows the first and second excavators 1A and 1B in the vertical duplex posture. The water supply system and the mud discharge system are illustrated.

The operation and effect of the shield machine SM described above will be described.
The first and second work decks 11A and 11B are supported on the frames of the first and second rear body parts 4A and 4B so as to be rotatable around the axial centers of the first and second rear body parts 4A and 4B, respectively. Because the first and second deck rotation driving means 50A and 50B are provided to rotate the second work decks 11A and 11B so as to rotate relative to the frames of the first and second rear trunks 4A and 4B, respectively. Following the progress of the spiral excavation (the attitude of the H & V shield excavator), the first and second deck rotation driving means 50A and 50B are used to keep the first and second work decks 11A and 11B in a horizontal position. Since the first and second work decks 11A and 11B can be rotated, work such as assembly of segments on the first and second decks 11A and 11B is facilitated, and work efficiency is improved.

  Control units 70A and 70B (corresponding to spiral angle detection means) for detecting the current spiral angle of spiral turning from the start of spiral excavation when spiral excavation with the shield excavator SM is provided and detected by the control units 70A and 70B. Since the control units 70A and 70B for controlling the first and second deck rotation driving means 50A and 50B are provided so that the first and second work decks 11A and 11B maintain the horizontal posture based on the spiral angle, The posture adjustment in which the postures of the machine first and second work decks 11A and 11B that change according to the progress of the spiral excavation are always in a horizontal posture can be automatically performed with high accuracy.

  The first and second erector devices 10A and 10B respectively provided in the first and second rear body portions 4A and 4B are the frames of the first and second rear body portions 4A and 4B (the annular frame 22 and the annular body 28). ) Are respectively supported so as to be rotatable about the axial centers of the first and second rear body portions 4A and 4B, and the first and second work decks 11A and 11B are rotating drums of the first and second erector apparatuses 10A and 10B, respectively. Are supported by the frames of the first and second rear body portions 4A and 4B on the inner diameter side of the first and second erector devices 10A and 10B when the segments are assembled. There is no trouble such as interference with the work decks 11A and 11B.

  The first and second excavators 1A and 1B each have a plurality of shield jacks 7 having a stroke detection function, and when excavating spirally with the shield excavator SM, the spiral excavation start position is changed to the spiral excavation end position. Spiral angle Sp per unit digging distance is calculated based on the total spiral digging distance L (for example, 125 m) and the total spiral angle (for example, 90 °) from the spiral digging start position to the spiral digging end position. Since the control units 70A and 70B for controlling the strokes of all the shield jacks 7 using the spiral angle Sp per unit digging distance and the digging direction width (600 mm) of the segment S are provided, the total spiral digging distance L After digging so that spiral digging spirals by the total spiral angle The stroke control of a plurality of shield jacks 7 automatically can be performed with high accuracy.

The operation and effect of the shield machine SM described above will be described.
A sludge pipe 9 is provided inside each of the first and second excavating machines 1A and 1B. Each of the sludge pipes 9 is branched from the sludge main pipe 9a and the main sludge body 9A. , 3B are provided with two drainage branch pipes 9b, 9c connected to the outer peripheral portions of the chambers 17A, 17B on the back side, and when in a horizontal dual position, one first waste mud branch pipe 9b is provided in the chamber 17A. , 17B is connected to the chambers 17A, 17B so as to discharge mud from the bottom portion of the outer peripheral portion of the outer peripheral portion of 17B, and the second mud discharge branch pipe 9c is opposite to the spiral excavation direction from the first exhaust mud branch pipe 9b. Since it is connected to the chambers 17A and 17B at a position 90 ° apart in the circumferential direction, in the first half of the spiral excavation (until the spiral angle becomes about 45 °), the first waste mud branch pipe 9b The bottom of chamber 17A, 17B or its vicinity In the latter half of the spiral excavation (after the spiral angle reaches about 45 °), the outer periphery of the chambers 17A, 17B is switched to the mud from the second mud branch pipe 9c. Since the mud can be drained from the bottom part or the vicinity thereof among the slipping parts, the mud drained from the bottom part or the vicinity thereof in the parts near the outer periphery of the chambers 17A and 17B over the entire period of the spiral excavation. The function can be reliably maintained.

  When excavating in a spiral shape with the open / close valves 9f and 9g (corresponding to the branch pipe opening / closing means) provided on the drainage branch pipes 9b and 9c for opening and closing the drainage branch pipes 9b and 9c, respectively. The control units 70A and 70B (corresponding to the spiral angle detection means) that detect the current spiral angle rotated from the start of spiral excavation and the two on-off valves 9f and 9g are switched and controlled based on the detected spiral angle. Since the control units 70A and 70B (corresponding to the waste mud control means) are provided, the on / off valves 9f and 9g of the waste mud branch pipes that cannot be drained according to the progress of the spiral excavation can be closed to drain the mud. The mud discharge function can be maintained by opening the on-off valves 9f and 9g of the mud branch pipe.

  Moreover, since the preliminary waste mud branch pipe 9d is provided in addition to the second waste mud branch pipe 9c, when the mud is discharged from the second waste mud branch pipe 9c, the preliminary mud branch pipe 9d is also drained. In addition, it is possible to increase the mud discharge capacity, and when the second mud drain branch pipe 9c breaks down, the mud function can be prevented from being lost because the mud can be drained from the preliminary mud branch pipe 9d. Since the on / off valve 9h is also provided on the preliminary drainage branch pipe 9d, if the mud is not discharged from the preliminary waste mud branch pipe 9d, the on / off valve 9h is closed and the mud is discharged from the preliminary waste mud branch pipe 9d. At that time, mud can be discharged by opening the on-off valve 9h.

  A water supply pipe 8 is provided inside each of the first and second excavators 1A and 1B. Each of the water supply pipes 8 branches from the water supply main pipe 8a and the water supply main pipe 8a to a portion near the outer periphery of the chambers 17A and 17B. When the two water supply branch pipes 8b and 8c to be connected are provided and the shield machine SM is in a horizontal dual-position, the first water supply branch pipe 8b is connected to the upper end portion of the chambers 17A and 17B near the outer periphery, The second water supply branch pipe 8c is connected to the chambers 17A and 17B at a position spaced apart from the first water supply branch pipe 8b by 90 ° in the direction opposite to the spiral excavation direction, so that in the first half of the spiral excavation, Water can be supplied from the first water supply branch pipe 8b to the upper ends of the chambers 17A and 17B or in the vicinity thereof, and in the latter half of the spiral excavation, the chambers 17A and 1 can be supplied from the second water supply branch pipe 8c. It can be water in the upper portion or near portion thereof of B.

  The first and second work decks 11A and 11B are supported on the frames of the first and second rear body parts 4A and 4B so as to be rotatable around the axial centers of the first and second rear body parts 4A and 4B, respectively. Because the first and second deck rotation driving means 50A and 50B are provided to rotate the second work decks 11A and 11B so as to rotate relative to the frames of the first and second rear trunks 4A and 4B, respectively. Following the progress of the spiral excavation (the attitude of the H & V shield excavator), the first and second deck rotation driving means 50A and 50B are used to keep the first and second work decks 11A and 11B in a horizontal position. Since the first and second work decks 11A and 11B can be rotated, work such as assembly of segments on the first and second decks 11A and 11B is facilitated, and work efficiency is improved.

  Control units 70A and 70B (corresponding to spiral angle detection means) for detecting the current spiral angle of spiral turning from the start of spiral excavation when spiral excavation with the shield excavator SM is provided and detected by the control units 70A and 70B. Control units 70A and 70B (deck attitude control) for controlling the first and second deck rotation driving means 50A and 50B so that the first and second work decks 11A and 11B maintain the horizontal attitude based on the spiral angle. Therefore, it is possible to automatically and accurately perform posture adjustment in which the postures of the first and second work decks 11A and 11B, which change according to the progress of the spiral excavation, are always horizontal.

  The first and second erector devices 10A and 10B respectively provided in the first and second rear body portions 4A and 4B are the frames of the first and second rear body portions 4A and 4B (the annular frame 22 and the annular body 28). ) Are respectively supported so as to be rotatable about the axial centers of the first and second rear body portions 4A and 4B, and the first and second work decks 11A and 11B are rotating drums of the first and second erector apparatuses 10A and 10B, respectively. Are supported by the frames of the first and second rear body portions 4A and 4B on the inner diameter side of the first and second erector devices 10A and 10B when the segments are assembled. There is no trouble such as interference with the work decks 11A and 11B.

  The first and second excavators 1A and 1B each have a plurality of shield jacks 7 having a stroke detection function, and when excavating spirally with the shield excavator SM, the spiral excavation start position is changed to the spiral excavation end position. Spiral angle Sp per unit digging distance is calculated based on the total spiral digging distance L (for example, 125 m) and the total spiral angle (for example, 90 °) from the spiral digging start position to the spiral digging end position. Since the control units 70A and 70B for controlling the strokes of all the shield jacks 7 using the spiral angle Sp per unit digging distance and the digging direction width (600 mm) of the segment S are provided, the total spiral digging distance L After digging so that spiral digging spirals by the total spiral angle The stroke control of a plurality of shield jacks 7 automatically can be performed with high accuracy.

Next, an example in which the above embodiment is partially changed will be described.
1) In the above-described embodiment, an example has been described in which the excavation is completed when the spiral dug is performed from the horizontal duplex posture to reach the vertical duplex posture. However, the attitude of the shield machine SM at the end of the dug is It is not limited to the continuous posture, and the excavation can be ended by spiral excavation by an arbitrary angle. Further, the attitude of the shield machine SM at the start of the excavation is not limited to the horizontal dual attitude, but the spiral excavation is started from an arbitrary attitude (for example, a vertical dual attitude, an inclined attitude as shown in FIG. 11). You can also

2) The total spiral digging distance L for spiral digging from the horizontal double posture to the vertical double posture is not limited to 125 m, and may be shorter or longer than 125 m.
3) The spiral direction for spiral excavation is not limited to the counterclockwise direction toward the excavation direction, and spiral excavation in the clockwise direction toward the excavation direction is also possible.

4) The number of the plurality of middle folding jacks 6 is not limited to 14, and the number of the plurality of shield jacks 7 is not limited to 20.
5) In the above-described embodiment, the case where the posture adjustment of the first and second work decks 11A and 11B is adjusted after the construction of the segment S for one ring has been described as an example. In view of the high frequency of using the first and second work decks 11A and 11B, the posture adjustment of the first and second work decks 11A and 11B may be performed immediately before the construction of the segment S for one ring.

6) The preliminary drainage branch pipe and on-off valve are not essential and can be omitted.
7) The shield excavator SM has been described by taking a shield excavator equipped with a muddy drainage device (water pipe, drainage pipe) as an example, but it is equipped with a mud drainage device (screw conveyor for mud drainage). The present invention cannot be applied to the shield machine that has been used.
8) In addition, those skilled in the art can implement the present invention in a form in which various heights are added to the above examples without departing from the spirit of the present invention.

  The present invention can be applied to an H & V shield machine that excavates various tunnels.

1A, 1B 1st, 2nd excavator 2A, 2B Cutter head 3A, 3B 1st, 2nd front trunk part 4A, 4B 1st, 2nd rear trunk part 7 Shield jack 8 Water supply pipe 8a Water supply main pipe 8b, 8c Water supply branch pipe 9 Drainage pipe 9a Drainage main pipe 9b, 9c Drainage branch pipe 9d Preliminary drainage branch pipe 10A, 10B First and second erector devices 11A, 11B First and second work decks 17A, 17B Chamber 22 Annular frame 25 Strut 26 Upper coupling material 27 Lower coupling material 28 Annular body 29 Connection part (connection means)
50A, 50B First and second deck rotation driving means 70A, 70B Control unit

Claims (5)

In H & V shield machine capable of spiral digging,
A first excavator having a first front body having a cutter head at a front end and a first rear body connected to the first front body so that the first front body can be folded;
A second excavator having a second front barrel having a cutter head at the front end, and a second rear barrel connected to the second front barrel so that the second front barrel can be folded;
Connecting means for connecting the first and second rear body parts so that the first and second front body parts can be folded in opposite directions;
A sludge pipe provided inside each of the first and second excavators,
Each of the sludge drain pipes is a plurality of drain sludge branch pipes that are branched from the sludge main pipe and connected to a portion near the outer periphery of the chamber on the back side of the front trunk portion, and are arranged in the circumferential direction. And a plurality of drainage branch pipes connected to the chamber at positions spaced apart from each other by a predetermined angle.   When each of the first and second excavators is in a horizontal dual attitude, in each of the first and second excavators, at least one of the plurality of exhaust mud branch pipes is positioned so as to be able to discharge mud from a portion near the bottom of the chamber. The H & V shield machine according to claim 1, wherein the plurality of sludge branch pipes are spaced apart from each other by a predetermined angle of 80 to 100 degrees in the circumferential direction. A branch pipe opening / closing means for opening and closing the waste mud branch pipe provided in each drainage branch pipe;
A spiral angle detecting means for detecting a current spiral angle that is spirally rotated from a spiral excavation start time when excavating in a spiral shape with the H & V shield excavator;
3. The H & V shield machine according to claim 2, further comprising a sludge control means for switching and controlling a plurality of branch pipe opening / closing means based on a spiral angle detected by the spiral angle detection means. Furthermore, it comprises a water pipe provided inside each of the first and second excavators,
Each of the water supply pipes is a water supply main pipe and a plurality of water supply branch pipes branched from the water supply main pipe and connected to a portion near the outer periphery of the chamber, and connected to the chamber at positions spaced apart by a predetermined angle in the circumferential direction. The H & V shield machine according to any one of claims 1 to 3, further comprising a plurality of water supply branch pipes.   When each of the first and second excavators is in a horizontal duplex position, in each of the first and second excavators, at least one of the plurality of water supply branch pipes can supply water to a portion near the upper end of the chamber in the front trunk portion. 5. The H & V shield machine according to claim 4, wherein the H & V shield tunneling machine is positioned and spaced apart by a predetermined angle of 80 to 100 degrees in the circumferential direction.