JP2005282120A - Shield machine and tunnel excavation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure by dispensing with even a support member of high strength in a cutter driving device. <P>SOLUTION: This shield machine has the cutter driving device 21 having a revolving partition wall 6 rotatably arranged around the rotational axis O1 in a front part of a shield body 1, a cutter rotating shaft 8 rotatably supported around the eccentric axis O2 eccentric to the rotational axis O1 by the revolving partition wall 6, a cutter head 10 arranged on the cutter rotating shaft 8 and having at least the outer peripheral excavation end forming three top parts of a triangle of a roulette, a revolvably driving mechanism 23A for rotating the revolving partition wall 6 around the eccentric axis, and an rotating driving mechanism 23B for allowing the cutter head 10 to rotate by rotatingly driving the cutter rotating shaft 8 around the eccentric axis O2. The rotating driving mechanism 23B has an rotating gear G6 arranged on the cutter rotating shaft 8, a revolving ring body 26 rotatably supported around the rotational axis O1, and a ring internal teeth gear G5 arranged in the revolving ring body 26 and meshing with the rotating gear G6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shield excavator for excavating a tunnel having an elliptical shape or a rectangular shape by rotating a cutter head, and a tunnel excavation method using the shield excavator.

  Conventionally, for example, as an excavation of a tunnel with an elliptical section or a rectangular section, an elliptical tunnel is excavated by using a cutter head whose top is bulged to the three apexes of the luro triangle using the principle of the triangle Japanese Patent Application Laid-Open No. 2004-268381 discloses an apparatus for excavating a rectangular cross-section tunnel, and Japanese Patent Application Laid-Open No. 2004-151867 discloses an apparatus for excavating a rectangular cross-section tunnel.

  In the cutter head drive mechanism of both shield machines, a cylindrical support is rotatably disposed around the central axis in a central space formed in the partition wall at the front of the shield body. A through hole is formed at an eccentric position, and a rotary shaft of the cutter head is rotatably provided in the through hole via a bearing.

  The cutter head drive device disclosed in Patent Document 1 includes a revolution side drive unit and a rotation side drive unit. The revolution-side drive unit is composed of a revolution ring gear attached to the outer periphery of the rear portion of the cylindrical support, a revolution drive pinion meshed with the revolution ring gear, and a revolution motor for rotating the revolution drive pinion. Is done. The rotation side drive unit is composed of a rotation inner ring gear attached to the rear end of the rotating shaft, and a rotation fixed gear fixed to the rear wall of the shield body and meshed with the rotation inner ring gear. Has been.

Further, the cutter head driving device disclosed in Patent Document 2 includes a revolution side driving unit and a rotation side driving unit. The revolution-side drive unit is composed of a revolution ring gear attached to the outer periphery of the rear portion of the cylindrical support, a revolution drive pinion meshed with the revolution ring gear, and a revolution motor for rotating the revolution drive pinion. Is done. The rotation drive unit includes a rotation gear attached to the rotation shaft of the cylindrical support, a rotation pinion that meshes with the rotation gear, and a rotation drive device for rotation that rotates the rotation pinion. The rotational drive device is attached to a support bracket supported by a cylindrical support.
JP-A-6-307190 JP-A-6-336898

  However, in Patent Document 1, since the fixed gear supports the rotational reaction force of the cutter head via the rotating shaft and the internal ring gear, a large load is applied to the rear wall body that supports the fixed gear, and the structure of the rear wall body It was necessary to increase the strength significantly. Also in Patent Document 2, it is necessary to sufficiently secure the strength of the support bracket attached to the cylindrical support, and there is a possibility that the size and structure of the cylindrical support may become unreasonable.

Since a high-strength support member is required in this way, there has been a problem that the design becomes considerably difficult when considering the members, equipment, installation environment, etc. around the rear part of the rotating shaft.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a shield machine and a tunnel excavation method that can simplify the structure without requiring a high-strength support member in the cutter driving device.

  According to the first aspect of the present invention, there is provided a revolution body that is rotatably provided around the rotation axis at the front portion of the shield body, and a rotation center that is eccentric to the revolution body with respect to the rotation axis. A supported rotating body, a cutter head provided on the rotating body and positioned in the triangle of the luro and having an outer peripheral excavation end protruding at three top positions of the luro triangle; and A shield excavator comprising a cutter driving device having a revolution driving mechanism for rotating around, and a rotation driving mechanism for rotating the rotating body around an eccentric axis to rotate a cutter head, wherein the rotation driving mechanism A rotation gear provided on the rotation body, a turning ring body rotatably supported around the rotation axis, and a ring internal gear provided on the rotation ring body and meshing with the rotation gear. It is equipped with

  Further, the invention according to claim 2 is directed to a revolution drive mechanism, a revolution gear provided in a revolution body, a revolution pinion meshing with the revolution gear, and a revolution rotation drive device that rotationally drives the revolution pinion. The rotation drive mechanism, a ring external gear provided on the swiveling ring body, a rotation pinion meshing with the ring external gear and rotating the rotation ring body, and the rotation pinion being driven to rotate. The rotation drive device for rotation is provided, and during the excavation of the tunnel, the rotation speed and the rotation direction of the rotation drive device for rotation and the rotation drive device for revolution are changed to continuously excavate tunnels having different cross-sectional shapes. It is comprised as follows.

  According to a third aspect of the present invention, the revolution drive mechanism is provided with a revolution gear provided on the revolution body and a revolution pinion coupled to the revolution gear, and the revolution drive mechanism is provided on the swivel ring body. A ring external gear, and a rotation pinion connected to and linked to the ring external gear, between the revolution gear and the revolution pinion of the revolution drive mechanism, and the ring external gear of the revolution drive mechanism; At least one of the rotation pinions is provided with a transmission gear device capable of changing the rotation speed and the rotation direction, and the revolving pinion and the rotation pinion are provided on the drive shaft of the cutter rotation driving device. The rotation speed and the rotation direction of the revolution body of the revolution drive mechanism and / or the rotation body of the rotation drive mechanism are changed by the transmission gear device, and tunnels having different cross-sectional shapes are continuously excavated by the cutter head. It is obtained by configured to.

  According to a fourth aspect of the present invention, the revolution drive mechanism is provided with a revolution gear provided on the revolution body, and a revolution pinion coupled to the revolution gear, and the revolution drive mechanism is provided on the swivel ring body. A ring external gear and a rotation pinion coupled to the ring external gear, the revolving pinion and the rotation pinion being mounted on a drive shaft of a cutter rotation driving device, and the drive shaft A power separation device capable of transmitting / non-transmitting the rotational force from the rotation to the pinion for rotation is provided, a ring lock device capable of fixing the swivel ring body is provided, and the power separation device and the ring lock device are operated during tunnel excavation. By fixing the swiveling ring body, the rotation shaft is driven to rotate according to the ratio of the number of teeth of the ring internal gear and the rotation gear, and the rotation speed and rotation direction of the rotation body by the rotation drive mechanism are changed. The cutter head is obtained by adapted to excavate continuously different tunnels of cross-sectional shapes.

  In the tunnel excavation method according to claim 5, when the tunnel is excavated using the shield machine according to claim 1, the rotation speed and rotation direction of the revolution body by the revolution drive mechanism, and the rotation of the revolution body by the rotation drive mechanism. By selectively changing the speed and rotation direction, tunnels having different cross-sectional shapes are continuously excavated.

  According to a sixth aspect of the tunnel excavation method, when the tunnel is excavated using the shield machine according to the first aspect, the rotation speed and the rotation direction of the revolution body by the revolution drive mechanism, and the rotation of the revolution body by the rotation drive mechanism. The speed and the rotation direction are selectively changed to excavate a cross section in which the previous excavation cross section and the subsequent excavation cross section are combined.

  According to the first aspect of the present invention, as the rotation driving mechanism for rotating the cutter head, the turning ring body supported rotatably around the rotation axis of the revolution body is disposed, and the ring inner teeth of the turning ring body are arranged. Since the rotating body is rotationally driven by the gear through the gear for rotation, the reaction force can be dispersed throughout the supporting member of the swivel ring body without concentrating on the part, and the strength of the supporting member can be reduced. In addition, the support member, the swivel ring body, and the rotation driving device thereof can be provided on the outer peripheral side in the shield body, and the structure can be simplified. In addition, with this structure, tunnels with arbitrary cross-sectional shapes such as rectangles, ellipses, and large-diameter circles can be excavated simply by selecting the rotation speed and rotation direction of the revolution body and swivel ring body. Parts can be shared in the shield machine for excavation, which can contribute to the reduction of manufacturing costs.

  According to the second aspect of the present invention, the rotation drive device for rotation and the rotation drive device for revolution provided independently are provided, and the rotation speed and the rotation direction are changed, so that the excavation is performed even during the excavation. The cross-sectional shape of the tunnel can be arbitrarily changed. Thereby, the stabilization of the ground at the time of joining of parallel tunnels can be achieved by large surplus excavation at the time of curve construction and lap excavation of the ground improvement part at the time of joining of parallel tunnels.

  According to the third aspect of the present invention, the rotational speed of the revolution body and / or the swivel ring body is obtained by interposing the transmission gear mechanism and / or the revolution drive mechanism with a speed change gear device capable of changing the rotation speed and the rotation direction. By changing the rotation direction, the cross-sectional shape of the excavation tunnel can be arbitrarily changed even during excavation. Thereby, the stabilization of the ground at the time of joining of parallel tunnels can be achieved by large surplus excavation at the time of curve construction and lap excavation of the ground improvement part at the time of joining of parallel tunnels.

  According to the fourth aspect of the present invention, the revolution pinion and the rotation pinion are provided coaxially on the drive shaft of the cutter rotation drive device, the turning ring body is fixed by the ring lock device, and the drive shaft is driven by the power separation device. By making the power of the motor non-transmitted to the rotation pinion, the rotation shaft can be rotated according to the ratio of the number of teeth of the ring internal gear and the rotation gear, and the rotation speed and rotation direction of the rotation body relative to the revolution can be changed. it can. Thereby, the tunnel of an irregular cross section can be continuously excavated.

  According to the fifth aspect of the present invention, the cross-sectional shape of the tunnel can be arbitrarily changed at a predetermined location during excavation, and construction according to the purpose can be easily performed. For example, by performing large surplus excavation during curve construction, the bending angle of the shield body can be reduced to stabilize excavation, and the bending range of the shield body can be reduced. Moreover, by excavating the ground improvement part when excavating the side-by-side tunnels, it is possible to stabilize the ground when joining the side-by-side tunnels.

  According to the invention described in claim 6, when there are projections such as injection nozzles or pipes for ground improver installed on the outer peripheral part of the shield body, excavation is possible with a copy cutter such as a hard bedrock or an arrival port of a reaching shaft. If there is an impossible hard obstacle, the protrusion may be damaged due to excessive excavation. However, for example, during the excavation of the rectangular cross-section tunnel, by alternately switching the rotation speed and rotation direction of the rectangular cross-section tunnel excavation and the rotation speed and rotation direction of the horizontally long elliptical cross-section tunnel for every millimeter excavation distance, It is possible to excavate a composite section tunnel in which a rectangular section and an elliptical section overlap. Thereby, damage to the protrusion can be prevented in advance.

[First Embodiment]
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 to 3, a partition wall 2 that forms a pressure chamber HC that holds the face collapse earth pressure is provided in the front part of the skin plate 1 a of the shield body 1 formed in an elliptical cross section. . The partition wall 2 includes a fixed partition wall 3 fixed to the inner peripheral surface of the skin plate 1a of the shield body 1, and a through-hole formed in the fixed partition wall 3 around a rotation axis (revolution axis) O1 on the shield shaft. The revolving partition wall (revolved body) 6 is rotatably disposed on the portion 4, and the revolving partition wall 6 is supported by the rear support member 25 via the swivel bearing 5. The revolution partition wall 6 includes a through bearing 7 centered on an eccentric axis O2 that is a predetermined eccentric distance e [e.g., e = (major axis d1 / 2−minor axis d2 / 2) / 2] from the rotational axis O1. The cutter rotation shaft (rotation body) 8 is rotatably supported in the bearing hole 7a.

  The cutter head 10 attached to the front end portion of the cutter rotating shaft 8 has three main arm-shaped cutters 13 projecting from the central member 11 having a center bit 12 in the radial direction at every 120 ° angle. The outer peripheral excavation end at the tip of the cutter 13 is set so as to be positioned at each of the three apexes of the ruler triangle. Further, a sub-arm-shaped cutter 14 shorter than the main-arm-shaped cutter 13 is projected at an intermediate position between the main-arm-shaped cutters 13 toward the center portion of the triangular triangle piece. The main arm-shaped cutter 13 and the sub-arm-shaped cutter 14 are connected to each other by a reinforcing ring 15, and a cutting bit 16 for excavation is attached to each arm-shaped cutter 13, 14 at a predetermined position. Each of 14 is arranged in the triangle of the rule. In addition, a copy cutter device 17 having a digging bit that can be freely retracted is provided at the outer digging end of the main arm cutter 13.

Further, a screw type earth removing device 9 is provided below the fixed partition wall 3 for discharging the earth and sand excavated by the cutter head 10 to the atmosphere chamber LC side while maintaining the face collapsed earth pressure.
A cutter driving device 21 provided on the air chamber LC side of the fixed partition 3 and rotationally drives the cutter head 10 includes a revolution drive mechanism 21A that rotationally drives the revolution partition 6 and a rotation drive that rotationally drives the cutter rotation shaft 8. It is comprised with the mechanism 21B. The revolution drive mechanism 21A includes a revolution gear G2 provided on the outer peripheral portion of the revolution partition wall 6, a revolution pinion G1 meshing with the revolution gear G2, and the revolution pinion G1 via a cutter drive shaft 22. And a plurality of (or singular) cutter rotation driving devices (hydraulic or electric motors) 23 that are driven to rotate, and a revolution pinion G1 interposed between the revolution pinion G1 and the cutter drive shaft 22, and the rotation speed and rotation of the revolution pinion G1. It is comprised with the transmission gear apparatus 27 which can change a direction. On the other hand, the rotation drive mechanism 21B is a swiveling ring body 26 that is fixed to the shield body 1 and supported by a rear support member 25 that supports the cutter rotation driving device 23 via a swivel bearing 24 so as to be rotatable around the rotation axis O1. A ring external gear G4 formed on the outer peripheral surface of the swivel ring body 26, a ring internal gear G5 formed on the inner peripheral surface of the swivel ring body 26, and the rear side of the cutter rotating shaft 8 being fixed. The rotation gear G6 meshes with the ring internal gear G5, and the rotation pinion G3 fixed to the cutter drive shaft 22 of the cutter drive device 23 common to the revolution drive mechanism 21A.

  Accordingly, the revolving pinion G1 is rotationally driven by the cutter rotation driving device 23 via the transmission gear device 27 to rotate the revolving partition wall 6 in a predetermined direction via the revolving gear G2, and at the same time, the ring external teeth are rotated by the revolving pinion G3. The turning ring body 26 can be rotated via the gear G4, and the cutter drive shaft 22 can be rotated to the ring internal gear G5 via the rotation pinion G3.

  Here, as shown in FIG. 4, for example, the number of teeth Z1 of the revolving pinion G1, the number of teeth Z2 of the revolving gear G2, the number of teeth Z3 of the revolving pinion G3, the number of teeth Z4 of the ring external gear G4, the ring internal teeth When the number of teeth of the gear G5 is Z5 and the number of teeth of the rotation gear G6 is Z6, and the rotation ratio of the input shaft to the output shaft of the transmission gear device 27 is 1: 1, in the case of tunnel excavation with an elliptical section, the amount of eccentricity e = (Major axis-minor axis) / 4. Further, the relationship between the number of teeth Z5 of the ring internal gear G5 and the number of teeth Z6 of the rotation gear G6 requires a relationship of Z5 = Z6 + 2e / M, assuming that the gear module M and the amount of eccentricity e.

  Further, since the revolution pinion G1 and the rotation pinion G3 are provided on the same cutter drive shaft 22, and the revolution gear G2 and the ring external gear G4 are provided on the same rotation axis O1, the revolution pinion Assuming that the module m1 of G1 and the revolution gear G2, the pinion G3 for rotation and the module m2 of the ring external gear G4, the relationship is (Z1 + Z2) × m1 = (Z3 + Z4) × m2.

Incidentally, the rotational speed n ′ of the revolving ring body 26 when the revolving partition wall (revolving body) 6 makes one rotation is n ′ = (Z3 × Z2) / (Z4 × Z1) = + 4/9, and is driven by the revolving ring body 26. Rotational speed n ″ = n ′ × (Z5 / Z6) = [(Z3 × Z2) / (Z4 × Z1)] × (Z5 / Z6) at this time. 6 and the rotation axis 8 is rotated together with the rotation number of the rotation axis 8 of the relative rotation axis n = (Z3 × Z2 × Z5) / (Z4 × Z1 × Z6) − (Z5 / Z6) = − 2/3.
For example, if the eccentricity e is 325 mm, the number of teeth Z1 of the revolving pinion G1 is 29, the number of teeth Z2 of the revolving gear G2 is 174, the module m1 of G1 and G2 is m = 28, and the number of teeth of the rotating pinion G3. Z3 = 14, number of teeth of ring external gear G4 Z4 = 189, module m2 of G3, G4 = 28, number of teeth of ring internal gear G5 Z5 = 78, number of teeth of rotation gear G6 Z6 = 65, Z5 When Z6 module M = 50,
Rotational speed n of the cutter rotation shaft 8 when the revolving partition wall 6 makes one rotation n = (14 × 174 × 78) / (189 × 29 × 65) −78 / 65 = (4 × 6) / (9 × 5) − 5/6 = −2 / 3. The rotational speed of the cutter head 10 at this time is the rotational speed of the revolving partition wall 6 + the rotational speed of the rotation shaft 8 = 1-2 / 3 = 1/3. Thereby, as shown in FIG. 2, the outer peripheral end of the cutter head 10 is rotationally moved while drawing an elliptical locus, and the tunnel Ta having an elliptical cross section can be excavated.

Here, FIG. 7 shows an example in which the rotation ratio of the rotation shaft 8 with respect to the revolving partition wall 6 is changed, including an example of excavation of the elliptical section tunnel Ta.
In Example A, by rotating the cutter rotation shaft 8 by -5/3 with respect to +1 rotation of the revolving partition wall 6, the rotation of the cutter head 10 becomes −2/3 rotation, and the tunnel excavated by the cutter head 10 is As shown in FIG. 4, a large-diameter circular tunnel Tb having a radius increased by the amount of eccentricity e is excavated.

  In Example B, when the cutter rotation shaft 8 is rotated -4/3 with respect to +1 rotation of the revolving partition wall 6, the cutter head 10 is rotated -1/3, and the tunnel excavated by the cutter head 10 is As shown in FIG. 5, a tunnel Tc having an approximately rectangular cross section in which the four corner portions are arc-shaped is excavated. Since the amount of eccentricity e = (major axis−minor axis) / 2 is not satisfied, the four sides are not straight lines, but are curved slightly outward.

  In Example C, when the swiveling ring body 26 is fixed and the number of teeth Z5 of the ring internal gear G5 is the number of teeth Z6 of the rotating gear G6 = 4: 3, Thus, the cutter rotation shaft 8 is rotated by -6/5, and the rotation of the cutter head 10 becomes -1/5. As a result, similarly to Example B, a tunnel Tc having a substantially rectangular cross section in which the four corner portions shown in FIG.

  Example D is the example described above, and by rotating the cutter rotation shaft 8 by −2/3 rotation with respect to the rotation of the revolving partition wall 6 by +1, the rotation of the cutter head 10 becomes +1/3 rotation. As shown in FIG. 2, the tunnel excavated by 10 is excavated with a tunnel Ta having a horizontally long elliptical cross section.

  When the tunnels Ta, Tb, and Tc are overlapped, they are represented as shown in FIG. 6, and the tunnel Tb in Example A can be excavated to the outer peripheral side of the other tunnels Ta and Tc. In comparison, the cutter head 10 can be expanded to the left and right. Here, when Tb is excavated continuously in the tunnels Ta and Tc, the shield machine will fall, but if it is a short distance that removes the obstacle, there will be a problem by injecting the backfill material. There is no.

  Therefore, for example, a shield machine 51 having a substantially rectangular cross section is used as shown in FIG. 8, and the tunnel Tc having a substantially rectangular cross section is inserted into a path (curvature radius is short) curved with a large curvature during excavation. When it starts, by changing to the tunnel Ta and continuously excavating, the tunnel width in the bending radius direction can be expanded and the shield body can be tilted. For example, the front barrel 51a and the rear barrel 51b are bent as shown in the figure. If so, the attitude can be controlled stably by reducing the bending angle. Further, since the curved path is excavated, the axial length of the shield body is not restricted.

  Further, as shown in FIG. 9, when there is a rectangular cross-section tunnel Tc ′ arranged side by side during excavation of the tunnel Tc having a substantially rectangular cross section, the ground can be changed by changing the tunnel Tc to an elliptical cross-section tunnel Ta or a large circular cross-section tunnel Tb. The improved portion can be lap excavated, and by filling the lap excavated portion with a filler, it is possible to stabilize the ground when joining the parallel tunnels.

  Further, for example, when the shield body 1 having a rectangular cross section is provided and the rectangular cross section tunnel Tc is being excavated, and the right and left outer surfaces of the shield body 1 have protrusions such as an injection nozzle or a pipe for ground improvement agent, There is no problem in the ground that is mixed with gravel, but when hard rock appears or when excavating the wall of the shaft, it is impossible to excavate the tunnel of the cross section including the protrusion with the copy cutter. If you try to pass through, the projection may be damaged. Therefore, in this shield machine, as shown in FIG. 10, by excavating the rectangular section tunnel Tc and the elliptical section tunnel Ta by alternately switching the example B and the example D in units of several millimeters, The composite cross-sectional tunnel Te in which the rectangular cross-sectional tunnel Tc and the elliptical cross-sectional tunnel Ta overlap is excavated. Thereby, it can extend to the side of the shield body 1 where the projection is located, excavate the obstacle, and prevent the projection from being damaged in advance.

  According to the above embodiment, in the rotation drive mechanism 21B of the cutter driving device 21, the turning ring body 26 that rotationally drives the cutter rotation shaft 8 is moved around the rotation axis O1 to the rear support member 25 via the turning bearing 24. By being supported rotatably, the load can be distributed to the outer peripheral side in the shield body 1, the load in the rotating direction of the swivel ring body 26 can be reduced, and the strength of the rear support member 25 and the support member 28 is reduced. can do. In addition, the rotating ring body 26 together with the revolving partition wall 6 and the revolving pinion G1 provided on the cutter drive shaft 22 are rotated together with the revolving partition wall 6 on the same rotation axis O1 that is rotatably arranged around the same rotation axis O1 as the revolving partition wall 6. With the diversion pinion G3, the revolution drive of the revolution partition wall 6 and the rotation drive of the turning ring body 26 can be rotationally driven. Thereby, reduction and size reduction of a cutter rotation drive device can be achieved.

  Further, the transmission gear unit 27 can change the cross-sectional shape of the tunnel by changing the rotation speed and the rotation direction of the revolution pinion G1 with respect to the rotation pinion. For example, when constructing a curve with a large curvature during excavation of the rectangular cross-section tunnel Tc, by switching to the elliptical cross-section tunnel Ta (or large-diameter cross-section tunnel Tb), a wide excavation width in the curved radial direction is secured, and the shield body It is possible to reduce the contact angle between the front body 51a and the back body 51b, or to reduce the bending angle of the shield body in which the front body 51a and the rear body 51b are flexibly connected, thereby achieving stable excavation and stable posture. it can. Further, by securing a large amount of excavation on the adjacent side of the ground improvement portion S with the tunnel Tc 'arranged side by side, the ground can be stabilized at the time of joining the parallel tunnel by performing lap excavation. Furthermore, when there is a hard obstacle in the excavation part, the cutter head 10 can excavate the composite section Te by alternately switching the rotation direction and the rotation speed of the revolving partition wall 6 and the cutter rotation shaft 8. As a result, damage to the protrusions on the outer peripheral portion of the shield body 1 can be prevented.

The gear transmission 27 can also be provided between the cutter drive shaft 22 and the rotation pinion G3.
[Embodiment 2]
In this second embodiment, instead of the transmission gear device 27 in the first embodiment, a power separating device 31 capable of switching between transmission and non-transmission of rotational force from the drive shaft to the rotation pinion G3 and a swivel ring body 26 are fixed. A possible ring lock device 32 is provided.

  In other words, the power separation device 31 is configured such that the rotation pinion G3 is slidably fitted on the slide portion 22a formed of the spline outer tooth portion and the tooth notch portion formed on the cutter drive shaft 22 via the spline inner teeth so as to be slidable. The rotation pinion G3 is constituted by a switching device 31b including a linear drive device that slides between the spline tooth portion and the tooth notch portion of the slide portion 22a via the member 31a.

  Further, the ring lock device 32 is provided with a rear plate 28 that supports the cutter rotation driving device 23 via an intermediate member on the outer peripheral side of the shield body 1 on the back surface of the rear support member 25, and rotates on the rear plate 28. A pin retracting device 32a that is disposed at regular intervals in the circumferential direction centered on the axis O1 and is capable of withdrawing and retracting the lock pins 32b in the direction of the rotational axis O1 and a back surface of the swiveling ring body 26 at regular intervals. The lock pin hole 32c is formed.

  Therefore, by stopping the power transmission from the cutter drive shaft 22 to the rotation pinion G3 by the power separation device 31, and simultaneously locking the swiveling ring body 26 by the ring lock device 3, the rectangular cross-section tunnel Tc is formed as in Example C. It can be excavated, and two types of tunnels with irregular cross sections can be excavated in combination with other cross-sectional tunnels Ta, Tb and the like.

According to the second embodiment, the same effects as those of the first embodiment can be achieved.
[Embodiment 3]
In the third embodiment, the revolution cutter rotation drive device (revolution rotation drive device) 23A of the revolution drive mechanism 21A and the rotation cutter rotation drive device (rotation rotation drive device) 23B of the rotation drive mechanism 21B are respectively provided. It is provided independently.

  That is, a plurality of installation positions of the revolving cutter rotation driving device 23A and the rotating cutter rotation driving device 23B are formed at predetermined intervals in the circumferential direction on the rear plate 28 on the outer peripheral side in the shield body 1. Two rotating cutter rotation driving devices 23A are installed side by side on both sides, and the rotating cutter rotation driving device 23B is installed at other positions.

  A revolving pinion G1 meshing with the revolving gear G1 is attached to the revolving cutter drive shaft 22A of the revolving cutter rotation driving device 23A, and a revolving cutter driving shaft 22B of the revolving cutter rotation driving device 23B is attached to the ring. A rotation pinion G3 meshing with the external gear G4 is attached.

  Therefore, by changing the rotation direction and rotation speed of the revolving cutter rotation drive device 23A and the rotation cutter rotation drive device 23B during excavation, the rotation direction and rotation speed of the cutter head are changed, and the excavation section is changed. Can be changed. Thereby, there can exist an effect similar to Embodiment 1. FIG.

It is a longitudinal section showing Embodiment 1 of the shield machine according to the present invention. It is a front view of the shield machine. It is a rear view which shows arrangement | positioning of the cutter rotation drive device of the shield machine. It is a front view explaining the large diameter excavation cross section by the cutter head of the shield machine. It is a front view explaining the rectangular excavation cross section by the cutter head. It is a front view explaining comparatively the excavation cross section by the cutter head. It is a chart which illustrates the rotation direction and rotation speed by the cutter drive device of the shield machine. It is sectional drawing explaining the excavation state of the curved part by the same shield machine. It is sectional drawing explaining the excavation state of the parallel tunnel by the same shield machine. It is a front view which shows the excavation part by the shield machine. (A)-(c) shows Embodiment 2 of the shield machine according to the present invention, (a) is an overall longitudinal sectional view, (b) is a partially enlarged view showing a power separating device and a ring lock device, c) is a rear view showing the ring lock device. (A)-(c) shows Embodiment 3 of the shield machine according to the present invention, (a) is an overall longitudinal sectional view showing a revolution drive mechanism, and (b) is an AA arrow shown in (c). FIG. 3C is a rear view showing an arrangement of the revolving cutter driving device and the rotating cutter driving device.

Explanation of symbols

32c Lock pin hole O1 Rotating shaft center O2 Eccentric shaft center e Eccentric distance HC Pressure chamber LC Air chamber G1 Revolving pinion G2 Revolving gear G3 Rotating pinion G4 Ring external gear G5 Ring internal gear G6 Rotating gear 1 Shield Main body 2 Bulkhead 3 Fixed bulkhead 6 Revolving bulkhead 8 Cutter rotation shaft 10 Cutter head 12 Center bit 13 Main arm-shaped cutter 21 Cutter drive device 21A Revolution drive mechanism 21B Revolution drive mechanism 22 Cutter drive shaft 22A Revolution cutter drive shaft 22B Revolution cutter Drive shaft 23 Cutter rotation drive device 23A Revolution cutter rotation drive device 23B Rotation cutter rotation drive device 24 Swivel bearing 25 Rear support member 26 Swivel ring body 28 Rear plate 31 Power separation device 31a Slide shaft portion 31b Fork member 32 Ring lock device 32a pin exit / exit device 2b lock pin

Claims (6)

A revolution body provided rotatably around a rotation axis at the front portion of the shield body, a rotation body rotatably supported around an eccentric axis that is eccentric to the rotation axis by the revolution body, and A cutter head provided on the rotating body and positioned within the triangle of the ruler and having an outer peripheral excavation end protruding at three top positions of the triangle of the ruler; and a revolution drive mechanism for rotating the revolution body about a rotation axis; A shield machine equipped with a rotation drive mechanism for rotating the rotation body around an eccentric axis to rotate the cutter head,
The rotation driving mechanism includes a rotation gear provided on the rotation body, a turning ring body supported rotatably around the rotation axis, and a ring provided on the turning ring body and meshing with the rotation gear. A shield machine with an internal gear. The revolution drive mechanism is provided with a revolution gear provided on the revolution body, a revolution pinion that meshes with the revolution gear, and a revolution rotation drive device that rotationally drives the revolution pinion.
The rotation drive mechanism includes a ring external gear provided on the swivel ring body, a rotation pinion that meshes with the ring external gear and rotationally drives the rotation ring body, and a rotation rotation that rotationally drives the rotation pinion. A drive device,
During the tunnel excavation, the rotational speed and the rotational direction of the rotation driving device for rotation and the rotation driving device for revolution are changed to continuously excavate tunnels having different cross-sectional shapes. The shield machine according to claim 1. The revolution drive mechanism is provided with a revolution gear provided on the revolution body, and a revolution pinion coupled to the revolution gear,
The rotation drive mechanism is provided with a ring external gear provided on the swivel ring body, and a rotation pinion coupled to the ring external gear,
A speed change gear device capable of changing the rotation speed and the rotation direction is provided between at least one of the revolution gear of the revolution drive mechanism and the revolution pinion and between the ring external gear and the rotation pinion of the revolution drive mechanism,
The revolution pinion and the rotation pinion are provided on the drive shaft of the cutter rotation driving device,
During excavation of the tunnel, the rotation speed and direction of the revolution body of the revolution drive mechanism and / or the rotation body of the revolution drive mechanism are changed by the transmission gear device, and the tunnel head having different cross-sectional shapes is continuously excavated by the cutter head. The shield machine according to claim 1, wherein the shield machine is configured as described above. The revolution drive mechanism is provided with a revolution gear provided on the revolution body, and a revolution pinion coupled to the revolution gear,
The rotation drive mechanism is provided with a ring external gear provided on the swivel ring body, and a rotation pinion coupled to the ring external gear,
The revolution pinion and the rotation pinion are mounted on the drive shaft of the cutter rotation drive device, and a power separation device capable of transmitting / non-transmitting the rotational force from the drive shaft to the rotation pinion is provided,
A ring lock device capable of fixing the swivel ring body;
During the excavation of the tunnel, the rotating shaft is driven by the ratio of the number of teeth of the ring internal gear and the rotating gear by operating the power separating device and the ring lock device to fix the turning ring body, and by the rotation driving mechanism The shield machine according to claim 1, wherein the rotating speed and direction of rotation of the rotating body are changed and tunnels having different cross-sectional shapes are continuously excavated by the cutter head. When excavating a tunnel using the shield machine according to claim 1,
A tunnel excavation method comprising continuously excavating tunnels having different cross-sectional shapes by selecting the rotation speed and rotation direction of the revolution body by the revolution drive mechanism and the rotation speed and rotation direction of the rotation body by the rotation drive mechanism. . When excavating a tunnel using the shield machine according to claim 1,
A cross section in which the previous excavation cross section and the subsequent excavation cross section are combined by selectively changing the rotation speed and rotation direction of the revolution body by the revolution drive mechanism and the rotation speed and rotation direction of the rotation body by the rotation drive mechanism. A tunnel excavation method characterized by digging.

Images