JP2005256434A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a cutter driving unit by dispensing with a high-strength reaction bearing member for the cutter driving unit. <P>SOLUTION: This shield machine excavates an elliptic tunnel through the use of a cutter head 10 by revolving a revolving bulkhead 6 around the axis O1 of revolution in a prescribed direction, and rotating a cutter rotating shaft 8 around an eccentric axis O2 at a one-third speed in the same direction as that of the revolving bulkhead 6. In the shield machine, a pinion G1 for revolution, which is meshed with a gear G2 for the revolution of the revolving bulkhead 6, is meshed with a ring external-gear of a slewing ring body 26 via a cutter driving shaft 22 which is rotated by a cutter rotating drive unit 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shield machine for excavating a tunnel having an elliptical section by rotationally driving a cutter head with a cutter head driving device.

  Conventionally, as a method for excavating a tunnel having an elliptical cross section, a method for excavating using a cutter head whose top portion swells to three top portions of a luro triangle using the principle of the triangle of the luro is disclosed in Patent Document 1. Has been.

  In the drive mechanism of the cutter head, 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, and the cylindrical support is located at a position eccentric from the central axis. A through hole is formed, and a rotary shaft of the cutter head is rotatably provided in the through hole through a bearing.

The cutter head driving device includes a revolution driving unit and a rotation driving unit. The revolution 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 that meshes with the revolution ring gear, and a revolution motor that rotates the revolution drive pinion. The The autorotation drive unit includes an autorotating internal ring gear attached to the rear end of the rotary shaft, and a fixed gear fixed to the rear wall of the shield body and meshed with the internal gear ring gear.
JP-A-6-307190

  However, 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 structural strength of the rear wall body is greatly increased. It was necessary to let them. For this reason, there has been a problem that the design is considerably unreasonable in consideration of members around the rear part of the rotating shaft, equipment, installation environment, and the like.

  An object of the present invention is to solve the above problems and to provide a shield machine capable of simplifying the structure without requiring a high-strength reaction force support member in the cutter driving device.

  The invention according to claim 1 is arranged in such a manner that a rotating body is rotatably arranged at a position eccentric with respect to the rotational axis on a revolution body provided to be rotatable around a rotational axis at a front portion of the shield body, The rotating body is provided with a cutter head whose outer peripheral excavation end protrudes at three top positions of a triangular triangle, and the revolution body is rotated around a rotation axis in a predetermined direction, and the rotation body is rotated in the same direction as the revolution body. In a shield machine that excavates an elliptical tunnel with the cutter head by rotating around an eccentric axis about 1/3, the revolution gear provided on the revolution body is revolved via a revolution pinion. A cutter rotation drive device for rotating the body is provided, and a ring ring external gear is provided on the outer peripheral portion and a ring internal gear is provided on the inner peripheral portion of the swiveling ring body supported by the shield body so as to be rotatable around the rotation axis. Set in A rotation pinion arranged coaxially with the revolving pinion and driven synchronously by a cutter rotation driving device is engaged with a ring external gear of the swivel ring body, and the rotation body is moved into the ring of the swivel ring body. A rotation gear meshed with the tooth gear is provided.

  According to a second aspect of the present invention, the rotating body is provided with a stirring shaft member that is rotatable about an eccentric shaft center, and a sand stirring blade body is provided at the front end of the stirring shaft member at the rear of the cutter head. A stirring drive device is provided on the rear end side of the stirring shaft member, and the stirring drive device is fixed to a stirring drive gear provided on the rear end side of the stirring shaft member and the shield body, and the stirring drive device is fixed. This is composed of a stirring drive gear meshed with a gear.

  According to the first aspect of the present invention, the revolving pinion and the rotation pinion arranged on the same axis are rotationally driven by the cutter rotation driving device to rotationally drive the revolving body, and via the swivel ring body Since the rotating body is driven to rotate and the rotating body is rotated at the speed of 1/3 in the same direction as the revolving body, there is no need for a high-strength reaction force receiving member as in the prior art. With the two pinions that are rotationally driven on the same axis, the rotational drive of the revolution body and the rotational drive of the rotation body can be performed, and the structure can be simplified.

  According to the invention of claim 2, since the stirring drive device is constituted by the stirring drive gear attached to the stirring shaft member and the stirring drive gear meshed with the stirring drive gear, A part of the power of the cutter driving device can be taken out and used for stirring, and a rotation driving device dedicated to stirring can be dispensed with, which can contribute to a reduction in manufacturing cost.

[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 pressure chamber HC that holds the face collapsed earth pressure is formed in the front part in the skin plate 1 a of the shield body 1 formed in an elliptical cross section substantially the same as the cross section of the tunnel to be excavated. A partition wall 2 to be formed is provided. The partition wall 2 is pivotable to 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 4 formed around the rotation axis O1 on the shield shaft in the fixed partition wall 3. The revolution partition wall 6 is supported by the rear support member 25 via the slewing bearing 5. This revolution partition wall 6 is provided with a through bearing 7 centering on an eccentric axis O2 that is a predetermined eccentric distance e [e = (major axis d1 / 2−minor axis d2 / 2) / 2] away from the rotation axis O1. Then, a cutter rotating shaft (spinning 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. In addition, a sub-arm-shaped cutter 14 that is shorter than the main-arm-shaped cutter 13 is projected in a radial direction at an intermediate position between the main-arm-shaped cutters 13. The main arm-shaped cutter 13 and the sub-arm-shaped cutter 14 are connected to each other by a reinforcing ring 15, and excavation cutter bits 16 are attached to the arm-shaped cutters 13 and 14 at predetermined positions. 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 that is provided on the atmospheric chamber LC side of the fixed partition 3 and rotationally drives the cutter head 10 meshes with a revolving gear G2 provided on the outer periphery of the revolving partition 6 and the revolving gear G2. A revolving pinion G 1, a plurality (or a single) cutter rotation driving device (hydraulic or electric motor) 23 for rotating the revolving pinion G 1 via a cutter driving shaft 22, and a cutter of the cutter driving device 23. A rotation pinion G3 fixed to the drive shaft 22 and a rear support member 25 fixed to the shield main body 1 and supporting the cutter rotation drive device 23 are rotatably supported around the rotation axis O1 via a swivel bearing 24. The swiveling ring body 26, the ring external gear G4 formed on the outer peripheral surface of the swiveling ring body 26 and meshed with the rotation pinion G3, and the inner periphery of the swiveling ring body 26 To the formed ring gear G5, ring gear G5 is secured to the rear side of the cutter rotation axis 8 is provided with a self-diversion gear G6 is meshed.

  Therefore, at the same time as the revolving partition wall 6 is driven to rotate in a predetermined direction by the cutter rotation driving device 23 via the revolving pinion G1 and the revolving gear G2, the rotating ring body 26 is moved by the rotating pinion G3 via the ring external gear G4. Rotate. Then, the rotary shaft 26 rotates the cutter rotation shaft 8 at a speed of 1/3 in the same direction as the revolution partition wall 6 via the ring internal gear G5 and the rotation gear G6, as shown in phantom lines in FIG. In addition, an elliptical tunnel can be excavated by the outer peripheral excavation end of the main arm cutter 13 of the cutter head 10.

  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 rotating pinion G3, the number of teeth Z4 of the ring external gear G4, Assuming that the number of teeth Z5 of the tooth gear G5 and the number of teeth Z6 of the gear G6 for rotation are eccentric amounts e = (major axis−minor axis) / 4 in the case of tunnel excavation with an elliptical cross section. 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 module m2 of the rotation pinion G3 and 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 Z4 = 189 of ring external gear G4, module m2 = 28 of G3, G4, number of teeth Z5 = 78 of ring internal gear G5, number of teeth Z6 = 65 of rotation gear G6, 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.

  According to the above embodiment, the revolving pinion G1 and the revolving pinion G3 that are respectively fixed on the cutter driving shaft 22 are synchronously rotated by the cutter rotation driving device 23, and the revolving partition wall 6 is revolved. At the same time, the cutter rotation shaft 8 is rotationally driven via the swivel ring body 26, and the cutter rotation shaft 8 is configured to rotate in the same direction as the revolving partition wall 6 at a speed of 1/3. The reaction force receiving member is also unnecessary, and the revolving drive of the revolving partition wall 6 and the rotation of the cutter rotation shaft 8 can be performed by the two pinions G1 and G3 which are rotationally driven coaxially by the cutter rotation driving device 23. The structure can be simplified.

[Second Embodiment]
As shown in FIGS. 5 and 6, the shield machine according to the first embodiment is a cutter driving device 21 in which a soil stirring device 31 provided in a pressure chamber HC is incorporated. Note that the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  That is, the partition wall 2 is rotatably disposed in the outer peripheral fixed partition wall 3 and the through-hole 4 formed around the rotation axis O1 on the shield shaft in the fixed partition wall 3 and swivels to the rear support member 25. A revolving partition (revolved body) 6 that is pivotably supported via a bearing 5 and a through-hole 41 centered on an eccentric axis O2 that is separated from the rotation axis O1 by a predetermined eccentric distance e from the revolving partition 6 are rotated. It is comprised with the rotation partition (rotation body) 43 arrange | positioned rotatably via the bearing 42. As shown in FIG.

  The cutter head 10 is supported by the rotating partition wall 43 via a plurality of support legs 44. The stirring device 31 provided in the pressure chamber HC includes a stirring shaft cylinder (stirring shaft member) 32 that is rotatably supported via a bearing in a through-hole formed on the eccentric shaft center O2 of the rotating partition wall 43. A connecting shaft 45 that is rotatably fitted in the shaft hole of the stirring shaft cylinder 32, a plurality of stirring blades 33 that are attached to the pressure chamber HC on the distal end side of the stirring shaft cylinder 32, and the stirring shaft cylinder 32. It comprises a stirring drive device 34 provided at the base end, and the excavated earth and sand taken into the pressure chamber HC after excavation is agitated by the agitating blade 33 to improve the fluidity, and the earth and sand are discharged from the earth removing device 9. Is promoting.

  The agitation drive device 34 is formed on the agitation gear G11 fixed to the rear part of the agitation shaft cylinder 32 and the inner peripheral part of the fixing ring 35 fixed to the face plate 25a of the rear support member 25, and the agitation gear G11 is engaged. The internal gear G12 for stirring is comprised. As a result, the stirring gear G11 is pivoted about the rotation axis O1 with the rotation of the revolution partition wall 6, and the stirring shaft cylinder 32 is rotated by meshing between the stirring internal gear G12 and the stirring gear G11. The stirring blade 33 is rotationally driven.

  The connecting shaft 45 is connected at its distal end to the central member 11 of the cutter head 10, and has a hollow portion connected to the equipment of the cutter head 10, such as a hydraulic source, power supply, signal transmission / reception piping, etc. A cable is built in and is configured to connect a pipe and a cable to the cutter head 10 via a rotary joint.

  According to the above configuration, the stirring drive device 34 is configured by the stirring gear G11 attached to the stirring shaft cylinder 32 and the stirring internal gear G12 meshed with the stirring gear G11. A part of the motive power of the drive device 21 can be taken out and used for stirring, and the rotation drive device dedicated to stirring required in the past can be dispensed with, which can contribute to a reduction in manufacturing cost. .

It is a longitudinal section showing a 1st embodiment of a shield machine according to the present invention. It is a front view of the shield machine. It is a front view which shows the motion of the cutter head of the shield machine. It is explanatory drawing which shows meshing | engagement of the gear of the cutter drive device of the shield machine. It is a longitudinal section showing a 2nd embodiment of a shield machine according to the present invention. It is a front view of the shield machine.

Explanation of symbols

O1 Rotating shaft center O2 Eccentric shaft center e Eccentric distance HC Pressure chamber LC Air chamber 1 Shield body 2 Bulkhead 3 Fixed bulkhead 6 Revolving bulkhead 8 Cutter rotation shaft 10 Cutter head 12 Center bit 13 Main arm cutter 21 Cutter drive device 22 Cutter drive Shaft 23 Cutter rotation drive device 24 Swivel bearing 25 Rear support member 26 Swivel ring body G1 Revolution pinion G2 Revolution gear G3 Rotation pinion G4 Ring external gear G5 Ring internal gear G6 Rotation gear 31 Stirring device 32 Stirring shaft cylinder 33 Stirring blade 34 Stirring drive device 35 Fixing ring G11 Stirring gear G12 Stirring internal gear 43 Rotating shaft 44 Support leg 45 Connecting shaft

Claims (2)

A rotating body is rotatably disposed at a position eccentric to the rotational axis on a revolving body provided to be rotatable around the rotational axis at the front portion of the shield body, and an outer peripheral excavation end is disposed on the rotational body. Cutter heads protruding at the three top positions of the triangle of the luro are provided, the revolution body is rotated in a predetermined direction around the rotation axis, and the rotation body is rotated around the eccentric axis in the same direction as the revolution body. In a shield machine that rotates at a speed of 3 and excavates an elliptical tunnel with the cutter head,
A cutter rotation drive device that rotationally drives the revolution body via a revolution pinion to the revolution gear provided in the revolution body,
The swiveling ring body rotatably supported by the shield body around the rotation axis is provided with a ring external gear on the outer peripheral portion and a ring internal gear on the inner peripheral portion,
The rotation pinion arranged coaxially with the revolving pinion and driven synchronously by the cutter rotation driving device meshes with the ring external gear of the swivel ring body,
A rotating machine that is provided with a rotating gear that meshes with a ring internal gear of the swivel ring body. The rotating body is provided with a stirring shaft member that is rotatable around an eccentric axis,
While providing a stirring blade for earth and sand at the rear part of the cutter head at the front end of the stirring shaft member, a stirring drive device is provided on the rear end side of the stirring shaft member,
The stirring drive device is composed of a stirring gear provided on the rear end side of the stirring shaft member, and an agitating internal tooth drive gear fixed to a shield body and meshed with the stirring gear. The shield machine according to claim 1, wherein

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