JP4396277B2 - Parent-child shield machine - Google Patents

Description

  The present invention relates to a parent-child shield machine that constructs a small-diameter tunnel by starting a child shield machine from a parent shield machine.

  A child shield machine having a disk-shaped child cutter on the shaft core and a parent shield machine having an annular parent cutter surrounding the child cutter on the outer periphery of the child shield machine. As a parent-child shield machine that starts and excavates natural ground to construct a small-diameter tunnel, the one described in Patent Document 1 is known. This parent-child shield machine is configured by providing a drive motor for driving the child cutter in the child shield machine, and connecting the parent cutter and the child cutter so as to be detachable via a rotation transmission means. By transmitting the force to the parent cutter, each cutter is rotated together. According to this, when starting the child shield machine from the parent shield machine, the drive motor can be used as it is, and the labor and time required for assembling the child shield machine can be saved. As described in Patent Documents 2 and 3 and the like, this technique is widely used.

  Further, in Patent Document 4, a drive motor for driving the parent cutter is provided in the parent shield machine, while a drive motor for driving the child cutter is provided in the child shield machine so that the parent cutter and the child cutter are driven separately. Is disclosed.

Japanese Patent No. 3192576 Japanese Patent Laid-Open No. 3-197791 Japanese Examined Patent Publication No. 2-44996 Japanese Utility Model Publication No. 3-32690

  By the way, when it is desired to construct a tunnel having a large cross section with a parent-child shield machine, a large torque according to the diameter of the parent-child shield machine is required. However, following the above-described conventional technology, if a technique is adopted in which a drive motor is provided only in the child shield machine and the driving force is transmitted to the parent cutter of the parent shield machine, the number of drive motors that can be provided in the child shield machine The size is determined by the diameter of the child shield machine. When the diameter of the child shield machine is small, sufficient driving torque cannot be given to the parent cutter of the parent shield machine, and the diameter is larger than that of the child shield machine. There was a problem that it was not possible to combine the parent shield machine.

  Further, when a drive motor is provided in each of the parent shield machine and the child shield machine as in the parent-child shield machine described in Patent Document 4, and the parent cutter and the child cutter are separately driven to rotate, sufficient drive torque for the parent cutter is obtained. However, since there is a difference in rotation between the parent cutter and the child cutter, it is not possible to provide an inflow material line for supplying hydraulic pressure or mud from the child cutter side to the parent cutter side. There has been a problem that the parent cutter cannot be provided with hydraulic equipment such as a copy cutter, or a mud supply port. In general, a technique for supplying hydraulic pressure or the like from a rotary joint provided at the shaft core of the child cutter to the parent cutter side via the child cutter has been established, but the parent system directly does not pass through the child cutter. A technique for supplying hydraulic pressure or the like to the cutter side is expected to be extremely difficult and is not considered to exist.

  Furthermore, when the parent and child shield machine is advanced, the drive motor of the parent shield machine transmits power to a gear having a larger diameter than the child cutter, whereas the drive motor of the child shield machine sends power to a gear having a smaller diameter than the child cutter. In order to transmit, the torque obtained from the drive motor of the child shield machine is smaller than the torque obtained from the drive motor of the parent shield machine, and there is a potential problem of poor efficiency. This problem is also related to the number and size of necessary drive motors, and has been a cause of increased manufacturing costs.

  Therefore, the object of the present invention is to solve the above-mentioned problems, and can efficiently drive the cutter with sufficient torque even if the diameter difference between the parent shield machine and the child shield machine is large, and the inflow material line can be extended to the parent cutter. It is to provide an inexpensive parent-child shield machine.

In order to solve the above-mentioned problems, the present invention has a disk-shaped child cutter at the shaft core portion and a child shield frame constituting the airframe, and the child cutter is pivotally supported by the child shield frame via a rotation shaft. A child shield machine, and an annular parent cutter surrounding the child shield machine on the outer periphery of the child shield machine, and a parent shield frame formed in a substantially cylindrical shape surrounding the child shield frame and constituting the machine body In a parent-child shield machine comprising a parent shield machine and starting a child shield machine from the parent shield machine to excavate a natural ground to construct a small-diameter tunnel, the parent cutter is rotated behind the parent cutter to drive the parent cutter. Rotation drive motors arranged along the circumferential direction and detachably provided from the child cutter of the child shield machine to the parent cutter, the rotation drive force from the parent cutter to the child cutter Engaging means for transmitting or blocking, plumbed so as to extend the rotary joint for supplying flowing material Rareko shield frame child cutter side provided on the rotary shaft, from a child cutter parent cutter inflow A material supply line, a supported portion supported on the parent shield frame so as to rotate coaxially via a radial thrust bearing, and a parent formed integrally with the supported portion and driven by the rotational drive motor A gear for the cutter, an annular seal portion provided at the front end of the supported portion and sealed in a liquid-tight manner to the parent shield frame, and extending forward to the seal portion and integrally connected to the rear end of the parent cutter. A plurality of connecting rod portions, and the engaging means is provided so as to be able to protrude and retract radially outward from the child cutter by a telescopic mechanism such as a hydraulic cylinder, An engagement groove provided in an inner peripheral portion of the parent cutter to be engaged with the engagement protrusion member, and relative movement of the engagement protrusion member provided in the engagement groove and engaged are allowed. And when the child shield machine starts from the parent shield machine, the engagement protrusion member is immersed inward in the radial direction so that the engagement means blocks the rotational driving force. At the same time, a part or all of the rotational drive motor connected to the parent cutter is moved to a position for driving the child cutter.

  Further, the front end portion of the engaging projection member is constituted by a cutter, and when the child shield machine starts from the parent shield machine and excavates a natural ground, the copy can protrude radially outward from the outer periphery of the child cutter. It should be a cutter.

  According to the present invention, the cutter can be efficiently driven with a sufficient torque even if the diameter difference between the parent shield machine and the child shield machine is large, and the inflow material line can be extended to the parent cutter, so that the parent-child shield machine can be made inexpensive. Can be manufactured.

  FIG. 1 is a side sectional view of a parent-child shield machine showing a preferred embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and particularly shows the arrangement of the drive motor in the parent shield machine.

  As shown in FIGS. 1 and 2, the parent-child shield machine 1 surrounds a child shield machine 4 having a disk-like child cutter 3 on the shaft core portion 2 and an outer periphery of the child cutter 3 of the child shield machine 4. And a parent shield machine 6 having an annular parent cutter 5.

  The child shield machine 4 starts from the parent shield machine 6 to excavate natural ground and constructs a small-diameter tunnel. The child shield machine 7 is a pivotal support for the child shield frame 7 and the child shield frame 7 constituting the machine body. A rotating shaft 8 extending forward in the direction is provided, and a child cutter 3 provided at the front end of the rotating shaft 8 for excavating natural ground. The child shield frame 7 is divided into front and rear parts when integrated with the parent shield machine 6, and only the front part is provided so as to be able to start in the parent shield frame 9 described later. Then, when the child shield machine 4 starts from the parent shield machine 6, the rotary shield motor 7 has a rotary drive motor transfer means 11 for transferring a part of the rotary drive motor 10 connected to the parent cutter 5. Is to be provided. The rotation drive motor transfer means 11 is composed of a hoist or the like, and is configured to be able to transfer the rotation drive motor 10 to the position of the child machine side motor mounting frame 12 provided in the child shield frame 7.

  As shown in FIGS. 1 and 3, the child cutter 3 and the parent cutter 5 are provided with engagement means 31 for transmitting or blocking the rotational driving force from the parent cutter 5 to the child cutter 3. . As shown in FIG. 3, the engaging means 31 is provided with an engaging projection member 13 that is provided on the child cutter 3 via a hydraulic cylinder 14 that is an expansion / contraction mechanism and that can be protruded and retracted radially outward from the child cutter 3. The engagement groove 15 provided in the inner peripheral portion of the parent cutter 5 to be engaged with the protrusion member 13 and the relative movement of the engagement protrusion member 13 provided in the engagement groove 15 and engaged are predetermined. And a buffer material layer 27 that is allowed within the above range. A cutter is formed at the tip of the engaging projection member 13, and when the child shield machine 4 starts from the parent shield machine 6 and excavates a natural ground, it protrudes radially outward from the outer periphery of the child cutter 3. Thus, the copy cutter 32 is configured. As described above, since the copy projection 32 is integrally formed on the engaging projection member 13, the function of connecting the slave cutter 3 and the master cutter 5 to transmit the driving force and the function of the copy cutter 32 are provided. It will be combined. The engaging groove 15 is formed so as to open radially inward on the inner periphery of the parent cutter 5. When the engaging protrusion member 13 protrudes radially outward, the engaging groove 15 is accommodated to receive the parent cutter 5. The child cutter 3 is configured to be engaged and connected to each other. A buffer material layer 27 is stretched in the groove of the engagement groove 15 so as to allow the relative movement between the front and rear direction of the engagement protrusion member 13 engaged therewith and the rotation direction within a predetermined range. Yes. The buffer material layer 27 is made of a material having elasticity such as rubber or urethane and sufficient strength. When the engagement protrusion member 13 is engaged in the engagement groove 15, the buffer material layer 27 is closely engaged with each other. Relative movement is allowed by deforming according to the engagement stress. Further, the buffer material layer 27 is formed thick in the rotation direction so as to satisfactorily absorb the fluctuation of the driving force transmitted from the parent cutter 5 to the child cutter 3 to protect the engaging protrusion member 13 and the parent cutter 5. It is configured.

  The rotating shaft 8 has a child cutter gear 16 meshed with a rotary drive motor 10 transferred from the parent shield machine 6 and inflow of hydraulic pressure, mud, etc. from the child shield frame 7 to the child cutter 3 side. A rotary joint 18 for supplying the material is provided.

  The parent shield machine 6 is formed in a substantially cylindrical shape surrounding the child shield frame 7 and constitutes the machine body. The parent shield machine 6 rotates coaxially with the parent shield frame 9 via a radial thrust bearing 19. A power transmission member 20 that is supported and transmits power to a parent cutter 5 described later, and a parent cutter 5 that is rotatably provided on the parent shield frame 9 via the power transmission member 20 and excavates natural ground. Configured.

  As shown in FIGS. 1 and 2, the main shield frame 9 is formed in a large diameter in accordance with the diameter of the tunnel to be constructed, and the main unit side for removably attaching the rotary drive motor 10 to the front end portion. A motor mounting frame 21 is provided. Specifically, the parent machine side motor mounting frame 21 is formed in an annular shape along the inner and outer circumferences of the parent shield frame 9, and is provided close to the rear end of the radial thrust bearing 19. The rotational drive motor 10 is arranged at the plurality of attachment positions of the parent machine side motor attachment frame 21 so as to be arranged behind the parent cutter 5 and along the circumferential direction thereof. As a result, the rotational driving force of each of the rotational driving motors 10 is collected in the parent cutter gear 22 which will be described later, and a large driving force for rotating the parent cutter 5 and the child cutter 3 together can be obtained. That is, the total driving force for rotationally driving the parent cutter 5 is divided into a plurality of rotation drive motors 10 and is configured to be carried by these plurality of rotation drive motors 10. Since all the rotary drive motors 10 transmit power to at least the parent cutter gear 22 having a diameter larger than that of the child cutter gear 16, more rotary drive motors 10 are provided in the machine along the parent cutter gear 22. be able to. Further, since the parent cutter gear 22 can be made larger according to the diameter of the parent shield machine 6, if the parent shield machine 6 has a larger diameter, it becomes possible to provide more rotation drive motors 10 accordingly, and the rotation drive motors. There is no shortage of 10 installation spaces. Since the rotational drive motor 10 is connected only to the large-diameter parent cutter 5 and power is transmitted to the child cutter 3 via the parent cutter 5, a larger torque can be obtained from the rotational drive motor 10. The parent cutter 5 and the child cutter 3 can be rotated efficiently. Thereby, compared with the conventional parent-child shield machine which connects the rotational drive motor 10 only to the child cutter 3, the structure of an apparatus can be simplified.

  A power transmission member 20 that transmits a driving force to the parent cutter 5 is formed in a ring shape and is sealed in a liquid-tight manner to the parent shield frame 9, and a radial thrust bearing 19 is provided extending rearward to the seal portion 23. A supported part 24 to be supported, a parent cutter gear 22 formed integrally with the supported part 24 and meshed with the rotary drive motor 10, and provided at the rear end of the parent cutter 5 provided to extend forward in the seal part 23. And a plurality of connecting rod portions 25 that are integrally connected.

  As shown in FIG. 1, the parent cutter 5 is provided with a copy cutter 33 and a hydraulic cylinder 30 for allowing the copy cutter 33 to protrude and retract radially outward. The inflow material supply line 17 for supplying hydraulic pressure to the hydraulic cylinder 30 is piped so as to extend from the inside of the child shield machine 4 to the child cutter 3 via the rotary joint 18 and then to the parent cutter 5. Since the parent cutter 5 and the child cutter 3 are integrally connected by the engaging means 31, the inflow material line 17 can be easily extended from the child cutter 3 to the parent cutter 5, and the hydraulic pressure that causes the copy cutter 33 to appear and disappear. The hydraulic pressure can be easily supplied to the cylinder 30. The inflowing material line 17 is provided with a valve (not shown) for opening and closing between the child cutter 3 side and the parent cutter 5 side. By closing the valve when separating the oil, the oil in the pipeline is prevented from leaking.

  Next, the operation of this embodiment will be described.

  When excavating the natural ground by excavating the parent-child shield machine 1 integrally, hydraulic pressure is supplied to each rotary drive motor 10 to rotate it. The driving force of each rotary drive motor 10 is all transmitted to the parent cutter gear 22 to drive the parent cutter 5 to rotate. Since the parent cutter gear 22 is formed to have a sufficiently larger diameter than the child cutter gear 16, compared with the conventional case where the driving force is transmitted to the child cutter gear 16, the respective rotary drive motors 10 A larger torque can be extracted and transmitted to the cutters 5 and 3.

  The rotation of the parent cutter 5 is transmitted to the child cutter 3 by engaging the engaging projection member 13 as an engaging means with the engaging groove 15 of the child cutter 3, and the child cutter 3 is rotated by the parent cutter 5. The At this time, the engagement protrusion member 13 can be relatively moved within a predetermined range by deformation of the buffer layer 27 in the engagement groove 15, so that the parent cutter 5 and the child cutter 3 are slightly misaligned. However, this can be absorbed and the rotation of the parent cutter 5 can be smoothly transmitted to the child cutter 3. Since the engaging protrusion member 13 and the engaging groove 15 are buried and closely adhered with the buffer material layer 27, foreign matter such as excavated earth and sand is not clogged between the engaging protrusion member 13 and the engaging groove 15. Therefore, the relative movement is reliably allowed and the rotation of the parent cutter 5 can be stably transmitted to the child cutter 3.

  Further, when a curve construction is performed by the parent-child shield machine 1, by supplying hydraulic pressure to the inflow material line 17, hydraulic pressure can be supplied from the rotary joint 18 to the parent cutter 5 side through the child cutter 3. 33 can be infested and dug up. Thereby, curve construction can be performed easily.

  When the construction of the large-diameter tunnel is completed in this way and the parent-child shield machine 1 reaches the point where the child shield machine 4 should be started, the earth removed previously removed from the child shield machine 4 as shown in FIG. The parts such as the apparatus are returned to the child shield machine 4 so that the child shield machine 4 can be started. At this time, the rotational drive motor 10 is removed from the parent shield machine 6, transferred to the position of the slave unit side motor mounting frame 12 using the rotational drive motor transfer means 11 shown in FIG. 1, and reused. . Since the child shield machine 4 does not require as much torque as the parent shield machine 6, a part of the rotational drive motor 10 of the parent shield machine 6 is transferred as shown in FIG. For this reason, the rotational drive motor 10 can be used effectively and the manufacturing cost of the whole parent-child shield machine 1 can be reduced.

  When the child shield machine 4 is assembled, the engagement projection member 13 of the child cutter 3 is retracted to release the engagement between the child cutter 3 and the parent cutter 5, and the child shield frame 7 and the parent shield frame 9 are engaged. Solve. Then, the valve provided in the inflow material line 17 is closed, and the inflow material line 17 is cut between the parent cutter 5 and the child cutter 3. When the child shield machine 4 is separated from the parent shield machine 6 in this way, the child shield machine 4 is started.

  After the child shield machine 4 is started, the cutter formed at the tip of the engaging projection member 13 functions as the copy cutter 32. For this reason, when a curve is constructed by the child shield machine 4, the hydraulic cylinder 14 is expanded and contracted so that the copy cutter 32 is appropriately projected and retracted from the child cutter 3 to perform extra digging.

  In this way, the rotation cutter 10 is arranged behind the parent cutter 5 to rotate the parent cutter 5 and along the circumferential direction thereof, and the rotation driving force is divided into a plurality of parts. 5 and an engaging projection member 13 that transmits or blocks rotational driving force from the parent cutter 5 to the child cutter 3, and the child shield machine 4 when the child shield machine 4 starts from the parent shield machine 6. 4 and the rotary drive motor transfer means 11 for transferring a part of the rotary drive motor 10 connected to the parent cutter 5, the parent-child shield machine 1 is configured. Even if the diameter difference of 4 is large, the cutters 3 and 5 can be driven efficiently with sufficient torque, and the inflow material line 17 can be extended to the parent cutter 5, thereby reducing the manufacturing cost of the parent-child shield machine 1. That.

  Further, the engagement means 31 is provided so as to be able to protrude and retract radially outward from the child cutter 3 by an extension mechanism such as a hydraulic cylinder 14, and the parent cutter to be engaged with the engagement protrusion member 13. 5 and the shock absorbing material layer 27 that allows the relative movement of the engagement protrusion member 13 provided in the engagement groove 15 to be engaged within a predetermined range. Therefore, it is possible to absorb a dimensional error between the parent cutter 5 and the child cutter 3 pivotally supported by the shield frames 7 and 9, respectively, and to engage the engaging projection member 13 and the engaging groove 15 with each other. It is possible to prevent foreign matter such as excavated earth and sand from entering during this period.

  And the front-end | tip part of the engagement protrusion member 13 is comprised with the cutter, and when the child shield machine 4 starts from the parent shield machine 6 and excavates a natural ground, it projects from the outer periphery of the child cutter 3 to the radial direction outward. Since the copy cutter 32 is configured as described above, curve construction of the child shield machine 4 can be easily performed.

  In addition, in order to connect the parent cutter 5 and the child cutter 3 more firmly, the parent cutter 5 and the child cutter 3 may be provided with auxiliary or reinforcing engagement means in addition to the engagement means 31 described above. Specifically, as shown in FIG. 6, the auxiliary or reinforcing engagement means 35 is an engagement protrusion provided so as to be able to protrude and retract in the radial direction from the parent cutter 5 by an expansion / contraction mechanism such as a hydraulic cylinder 26. A member 34, an engagement groove 28 provided in the outer peripheral portion of the child cutter 3 to be engaged with the engagement protrusion member 34, and an engagement protrusion member provided in the engagement groove 28 and engaged therewith. It is good to comprise and comprise the buffer material layer 29 which accept | permits the relative movement of 34 within a predetermined range. Thus, by providing the engaging projection member 34 on the parent cutter 5 side, another device can be provided in the child cutter 3, and the small installation space of the child cutter 3 can be used effectively.

  In addition, the rotary drive motor 10 is a hydraulic motor that can easily control overload. However, the rotary drive motor 10 may be an electric motor (not shown) that can be driven by simple wiring.

It is side surface sectional drawing of the parent-child shield machine which shows suitable embodiment of this invention. It is AA arrow sectional drawing of FIG. It is a principal part enlarged front view of a parent-child shield machine. It is side surface sectional drawing of a child shield machine. FIG. 5 is a cross-sectional view taken along line B-B in FIG. 4. It is a principal part enlarged front view of the parent-child shield machine which shows an auxiliary | assistant thru | or reinforcement engaging means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parent-child shield machine 2 Shaft core part 3 Child cutter 4 Child shield machine 5 Parent cutter 6 Parent shield machine 10 Rotation drive motor 11 Rotation drive motor transfer means 13 Engagement protrusion member 14 Hydraulic cylinder (extension mechanism)
15 engagement groove 27 buffer layer 31 engagement means 32 copy cutter

Claims (2)

A child shield machine having a disk-shaped child cutter at the shaft core and a child shield frame constituting the machine body, the child cutter being pivotally supported by the child shield frame via a rotation shaft, and the child shield machine A parent shield machine having an annular parent cutter surrounding the child cutter on the outer periphery of the child cutter and having a parent shield frame formed in a substantially cylindrical shape surrounding the child shield frame and constituting the machine body; In a parent-child shield machine that starts a child shield machine and constructs a small-diameter tunnel by excavating natural ground, a rotary drive motor arranged behind the parent cutter and along its circumferential direction to drive the parent cutter to rotate And an engagement for transmitting or interrupting the rotational driving force from the parent cutter to the child cutter. A stage, a rotary joint for supplying flowing material Rareko shield frame child cutter side provided on the rotary shaft, and inlet material supply line plumbed so as to extend to the parent cutter from the child cutter, the parent shield A supported portion supported by a frame so as to rotate coaxially via a radial thrust bearing, a parent cutter gear formed integrally with the supported portion and driven by the rotary drive motor, and the supported An annular seal portion that is liquid-tightly sealed on the parent shield frame and a plurality of connecting rod portions that extend forward to the seal portion and are integrally connected to the rear end of the parent cutter. And the engaging means includes an engaging protrusion member that can be protruded and retracted radially outward by an extension mechanism such as a hydraulic cylinder from the child cutter, and the parent cover to be engaged with the engaging protrusion member. And engaging groove provided on the inner peripheral portion of the data provided in the engaging groove, and, and a buffer material layer that allows the relative movement of the engaging projection member engaged, the parent shield When the child shield machine starts from the machine, the engagement projection member is immersed inward in the radial direction so as to block the rotation driving force of the engagement means, and the rotation connected to the parent cutter. A parent-child shield machine, wherein a part or all of a drive motor is moved to a position for driving the child cutter. A copy cutter that has a distal end portion of the engaging projection member configured by a cutter, and that can project radially outward from the outer periphery of the child cutter when the child shield machine starts from the parent shield machine and excavates a natural ground; The parent-child shield machine according to claim 1, wherein:

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