JP5017633B2 - Shield machine - Google Patents

Description

  The present invention relates to a shield machine used for forming a tunnel by a shield method.

  With the shield method, a steel outer cylinder called a tea cylinder called a shield is provided at the tip of the tunnel, and excavation is performed while holding down the soil that is about to collapse, and a block called a segment is assembled into a ring shape inside. It is known as a construction method (Non-Patent Document 1). A machine having a shield and used in the construction method is a shield machine.

  As a typical conventional shield machine, for example, a technique disclosed in Non-Patent Document 2 is known. This shield machine is configured to generate a propulsive force forward in the excavation direction by pressing the front end surface of the segment laid on the wall surface of the tunnel with a large number of shield jacks. Then, the propulsive force is transmitted to the cutter head provided at the front end of the shield in the excavation direction, and the cutter head that has obtained the propulsive force is rotated to excavate a natural ground ahead (see FIG. 1.1.1). Further, in order to adjust the excavation direction, a mechanism is adopted in which the shield is divided into front and rear, and a relative inclination angle between them is adjusted using a number of middle folding jacks (Non-Patent Document 2). Fig. 1.2.5). As described above, in a typical conventional shield machine, it is necessary to install a large number of jacks in the shield.

  On the other hand, Patent Document 1 discloses a technique for assembling segments in a spiral shape. This technology is designed to advance excavation of natural ground by placing a fan-shaped cutter at the tip of a spirally assembled segment and rotating the cutter spirally along the segment. . Thereby, this prior art can advance excavation, without requiring a shield jack. However, in this prior art, the cutter uses the surface including the excavation direction axis of the segment as the excavation surface, and originally does not require a propulsive force toward the front. Furthermore, this shield machine according to the prior art is not supposed to change the direction of excavation.

  As described above, a typical type of shield machine that excavates a natural ground in front of the excavation direction has a problem that a large number of shield jacks are required to obtain a forward propulsion force. Furthermore, as disclosed in Non-Patent Document 2, the shield machine that can change the excavation direction has a problem that a large number of middle-folding jacks are required. For this reason, the structure of the shield machine becomes complicated, and there is a problem that the front and rear total length must be large.

JP 62-0059796 A

Kajima Corporation website “Techno Library (2002)” (http://www.kajima.co.jp/news/digest/apr_2002/techno/index-j.htm) Shield Construction Method Technical Association “Mudden Pressurization Shield Construction Method Technical Data” (issued in June 2007, 11th edition: available at http://www.shield-method.gr.jp/gijyutsu/dk.pdf) Ref. 1.1 “Principle of mud pressure shield method” and Figure 1.2.5 “Outer support type shield for cobblestones and boulders”

  The present invention has been made in view of the above problems, and an object thereof is to provide a shield machine that does not require a large number of jacks.

  In order to solve the above problems and achieve the above object, the first aspect of the present invention is to excavate a natural ground to form a tunnel, and to divide the segment in the circumferential direction with the front end surface in the excavation direction. The shield machine is laid on the wall surface of the tunnel so as to have an inclined surface inclined in the excavation direction along. The shield machine includes a cylindrical shield, an orbiting propulsion body, a propulsion body drive mechanism, a cutter head, and a cutter head drive mechanism. The orbiting propulsion body is installed in the shield and generates a propulsive force forward in the excavating direction by circling so as to slide in the circumferential direction on the front end surface of the segment laid on the wall surface of the tunnel. Is. The propulsion body drive mechanism is installed in the shield and drives the orbiting propulsion body to rotate. The cutter head is provided at the front end portion of the shield in the excavation direction, and excavates a natural ground ahead. The cutter head driving mechanism is installed in the shield and drives the cutter head so as to excavate the front ground.

  According to this configuration, the circular propulsion body slides in the circumferential direction on the front end surface of the segment laid on the wall surface of the tunnel by being driven by the propulsion body drive mechanism. Since the front end surface of the segment has an inclined surface, the orbiting propulsion body obtains a propulsive force directed forward in the excavation direction by a reaction from the segment. This propulsive force is transmitted to the propelling body drive mechanism or the shield, and further to the cutter head provided at the front end of the shield in the excavation direction through the shield or the cutter head drive mechanism. Thus, the cutter head obtains a propulsive force and is driven by the cutter head driving mechanism, so that the excavation of the natural ground ahead of the excavation direction can be advanced. Since the orbiting propulsion body is used to obtain the propulsive force, a large number of propulsion jacks required for the conventional technology are not required. In the present invention, the fact that the front end surface of the segment has an inclined surface does not necessarily require that the entire front end surface of the segment has an inclined surface. “Tunnel” does not only refer to roads and railroads, but also includes sewage, piping, and cable installation, and also includes vertical shafts, which are formed by excavating natural ground. Widely means a hole.

  According to a second aspect of the present invention, there is provided a shield machine according to the first aspect, wherein the orbiting propulsion body includes an annular body that is orbitally driven by the propulsion body driving mechanism, and excavation of the annular body. A rolling element provided on a rear end surface in the direction and rolling on the front end surface of the segment.

  According to this configuration, since the orbiting propulsion member has the rolling element that rolls on the front end surface of the segment on the rear end surface in the excavation direction of the annular member, the annular propelling member rotates on the front end surface of the segment by driving around the annular member. It becomes possible to roll the moving body. Thereby, the friction between the orbiting propulsion body and the segment can be reduced, and as a result, the orbiting driving force applied from the propelling body drive mechanism to the orbiting propulsion body is efficiently converted into the propulsive force. Since a space is secured inside the annular body, it becomes easy to install other equipment such as an erector and a mud-carrying screw conveyor in the shield.

  According to a third aspect of the present invention, there is provided a shield machine according to the second aspect, wherein the circumferential propulsion body further includes an internal gear formed on an inner wall surface of the annular body. . In addition, the propulsion body drive mechanism has a drive gear that meshes with the internal gear, and drives the orbiting propulsion body through the drive gear.

  According to this configuration, the internal gear formed on the inner wall surface of the annular propulsion member and the drive gear included in the propulsion member drive mechanism are engaged with each other, so that the circulation drive force is propelled via the drive gear. It is given to the orbiting propulsion body from the body drive mechanism. That is, it becomes possible to drive the orbiting propulsion member with a simple structure.

  According to a fourth aspect of the present invention, there is provided a shield machine according to any one of the first to third aspects, wherein the orbiting propulsion body has a series of connecting pieces connected in an annular shape, Each of the series of connection pieces is connected to an adjacent connection piece so as to be relatively rotatable around an axis along the excavation direction, and the propulsion body drive mechanism is configured to connect the orbiting propulsion body to a predetermined number. It has a guide which guides along the track.

  According to this configuration, each of the series of connecting pieces connected in an annular shape can be relatively rotated around an axis along the excavation direction with the adjacent connecting piece, and guided along a predetermined track. Therefore, the shape of the orbit around the orbiting propulsion body is not limited to a circle. Therefore, the circular propulsion body can be applied not only to a circular machine that is a shield machine having a circular cross section but also to a rectangular machine, a double machine, a triple machine, and the like. In addition, even when applied to a circular machine, the orbiting propulsion body can easily follow the deformation of the shield due to rock pressure or the like.

  According to a fifth aspect of the present invention, there is provided a shield machine according to any one of the first to fourth aspects, wherein the cylindrical shield includes a shield head and a shield body that are divided from each other. have. The cutter head is provided on the shield head, and the orbiting propulsion body and the propulsion body drive mechanism are provided in the shield body. Further, the shield machine further includes an inclination angle adjusting mechanism for adjusting an inclination angle between the shield head and the shield body.

  According to this configuration, the shield has a shield head provided with a cutter head and a shield body provided with a circular propulsion body, which are divided from each other, and an inclination angle between them is Since it is adjusted by the tilt angle adjusting mechanism, the direction of excavation can be changed. Thereby, not only a straight traveling tunnel but also a tunnel having a curved path can be easily formed. In addition, since the propulsion drive mechanism that drives the orbiting propulsion member is provided in the shield body as well as the orbiting propulsion member, the orbiting drive of the orbiting propulsion member by the propelling member drive mechanism is easy and the propulsion member drive mechanism is simplified Structure.

  According to a sixth aspect of the present invention, there is provided the shield machine according to the fifth aspect, further comprising a coupling mechanism that couples the shield head and the shield body so as to be relatively tiltable. ing. The tilt angle adjusting mechanism includes a front cylindrical body, a rear cylindrical body, a front cylindrical body driving mechanism, and a rear cylindrical body driving mechanism. The front cylindrical body and the rear cylindrical body correspond to one and the other formed by obliquely cutting the cylindrical body, and are in contact with each other on the rounded surface. The front cylindrical body driving mechanism is installed in the shield head and rotationally drives the front cylindrical body. The rear cylindrical body driving mechanism is installed in the shield body and rotationally drives the rear cylindrical body.

  According to this configuration, the front cylindrical body and the rear cylindrical body are rotationally driven by the front cylindrical body driving mechanism and the rear cylindrical body driving mechanism, respectively. The rotation position around can be changed. The front cylindrical body and the rear cylindrical body correspond to one and the other formed by diagonally cutting the cylindrical body, and contact each other on the rounded surface. By changing, the relative direction of each central axis can be changed. The front cylindrical body driving mechanism and the rear cylindrical body driving mechanism that rotationally drive the front cylindrical body and the rear cylindrical body are respectively installed on a shield head and a shield body that are relatively tiltably connected. Since the relative direction of the central axis between the front cylindrical body and the rear cylindrical body changes, the relative direction of the central axis between the shield head and the shield body changes. It will be. In other words, by rotating and driving the front cylindrical body and the rear cylindrical body, the inclination between the shield head and the shield body without using a large number of jacks for adjusting the inclination angle required by the prior art. The corner can be adjusted. Since the front cylindrical body and the rear cylindrical body are each cylindrical, a space is secured inside them. For this reason, it becomes easy to install other equipment, for example, a mud carrying screw conveyor, etc. in the shield.

  According to a seventh aspect of the present invention, there is provided a shield machine for excavating a natural ground to form a tunnel and laying a segment on a wall surface of the tunnel, the cylindrical shield, and a propulsion generating mechanism And a cutter head and a cutter head drive mechanism. The propulsion force generating mechanism is installed in the shield, presses the front end surface in the excavation direction of the segment laid on the wall surface of the tunnel, and generates a propulsive force forward in the excavation direction by its reaction. The cutter head is provided at a front end portion of the shield in the excavation direction, and excavates a natural ground on the front surface. The cutter head drive mechanism is installed in the shield and drives the cutter head so as to excavate the front ground. The cylindrical shield has a shield head and a shield body that are divided from each other. The cutter head is provided on the shield head, and the propulsive force generation mechanism is provided on the shield body. The shield machine further includes a connection mechanism and an inclination angle adjustment mechanism. A connection mechanism connects the said shield head and the said shield trunk | drum so that it can incline relatively. The tilt angle adjusting mechanism adjusts the tilt angle between the shield head and the shield body. The tilt angle adjusting mechanism includes a front cylindrical body, a rear cylindrical body, a front cylindrical body driving mechanism, and a rear cylindrical body driving mechanism. The front cylindrical body and the rear cylindrical body have a shape that is formed by obliquely cutting the cylindrical body into pieces, and are in contact with each other on the cut surfaces. The front cylindrical body driving mechanism is installed in the shield head and rotationally drives the front cylindrical body. The rear cylindrical body driving mechanism is installed in the shield body and rotationally drives the rear cylindrical body.

  According to this configuration, the propulsive force generation mechanism generates the propulsive force forward in the excavation direction by the reaction from the segment laid on the wall surface of the tunnel. The propulsion force generation mechanism may be, for example, a propulsion jack used in the prior art, or may be one using a circular propulsion body according to the present invention. This propulsive force is transmitted to the cutter head provided at the front end of the shield in the excavation direction through the shield. Thus, the cutter head obtains a propulsive force and is driven by the cutter head driving mechanism, so that the excavation of the natural ground ahead of the excavation direction can be advanced. Further, since the front cylindrical body and the rear cylindrical body are respectively driven to rotate by the front cylindrical body driving mechanism and the rear cylindrical body driving mechanism, the rotational positions around the respective central axes by these driving mechanisms. Can be changed. The front cylindrical body and the rear cylindrical body correspond to one and the other formed by diagonally cutting the cylindrical body, and contact each other on the rounded surface. By changing, the relative direction of each central axis can be changed. The front cylindrical body driving mechanism and the rear cylindrical body driving mechanism that rotationally drive the front cylindrical body and the rear cylindrical body are respectively installed on a shield head and a shield body that are relatively tiltably connected. Since the relative direction of the central axis between the front cylindrical body and the rear cylindrical body changes, the relative direction of the central axis between the shield head and the shield body changes. It will be. That is, by rotating and driving the front cylindrical body and the rear cylindrical body, without using a large number of jacks for adjusting the inclination angle required by the prior art, it is possible to connect between the shield head and the shield body. The inclination angle can be adjusted. Since the front cylindrical body and the rear cylindrical body are each cylindrical, a space is secured inside them. For this reason, it becomes easy to install other equipment, for example, a mud carrying screw conveyor, etc. in the shield.

  According to an eighth aspect of the present invention, there is provided a shield machine according to the sixth or seventh aspect, wherein the coupling mechanism includes an annular coupling member, a first support member, and a second support. And a member. The annular connecting member is disposed around the front cylindrical body and the rear cylindrical body. The first support member supports the shield head so as to be rotatable to a pair of diagonal positions of the connecting member. The second support member supports the shield body so as to be rotatable to another pair of diagonal positions of the connecting member.

  According to this configuration, the coupling mechanism forms a universal joint having an annular coupling member. Since the shield head and the shield body are connected by a universal joint, they can be relatively inclined over all 360 ° directions. Accordingly, it is possible to easily form a tunnel whose traveling direction is curved left and right, curved up and down, or slanted. Further, the universal joint connects the shield head and the shield body through an annular connecting member, and the connecting member is disposed around the front cylindrical body and the rear cylindrical body. For this reason, a universal joint is comprised so that a front cylindrical body and a back cylindrical body may not prevent securing a space inside them.

  As described above, according to the present invention, since a large number of jacks required in the prior art are not required, a shield machine having a simple structure is realized.

It is a longitudinal cross-sectional view which shows the structure of the shield machine by Embodiment 1 of this invention. It is an external appearance perspective view of the rotation propulsion body used for the shield machine of FIG. It is a rear view of the rotation propulsion body used for the shield machine of FIG. It is a perspective view which shows another example of the rotation propulsion body used for the shield machine of FIG. It is explanatory drawing which shows the usage example of the rotation propulsion body of FIG. It is a perspective view which shows another example of the rotation propulsion body used for the shield machine of FIG. It is explanatory drawing which shows the usage example of the rotation propulsion body of FIG. It is explanatory drawing which shows another example of use of the rotation propelling body of FIG. It is a perspective view which shows another example of the rotation propulsion body used for the shield machine of FIG. It is a longitudinal cross-sectional view which shows the structure of the shield machine by Embodiment 2 of this invention. It is a perspective view which shows the structure of the connection mechanism used for the shield machine of FIG. It is a perspective view which shows the structure of the cylindrical sliding body used for the shield machine of FIG. It is a top view which shows operation | movement of the cylindrical sliding body of FIG. It is a perspective view which shows another example of a rotation propulsion body, (a) is a whole perspective view, (b) is a perspective view of one connection piece. It is a perspective view which shows another example of a rotation propulsion body. It is a perspective view which shows another example of a rotation propulsion body. It is a schematic sectional drawing which shows an example of the shield machine using the rotation propulsion body of FIGS. It is a schematic sectional drawing which shows another example of the shield machine using the rotation propulsion body of FIGS.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view showing the configuration of a shield machine according to Embodiment 1 of the present invention. This shield machine 100 excavates natural ground to form a tunnel, and lays the segment 5 in a spiral shape on the wall surface of the tunnel. Therefore, the shield machine 100 includes a cutter head 1, a cutter head drive mechanism 2, a cylindrical shield 10, a circular propulsion body 20, a propulsion body drive mechanism 30, an inclination angle adjustment mechanism 40, and an erector 50 as main components. I have.

  The cutter head 1 excavates a natural ground in front of the tunnel in the excavation direction F, is provided at the front end of the shield 10 in the excavation direction, and is driven to rotate by a cutter head drive mechanism 2 provided in the shield 10. The shield 10 is divided into a shield head 11 located in the front and a shield body 12 located in the rear. In the example of FIG. 1, the cutter head driving mechanism 2 is attached to the shield head 11, and the cutter head 1 is directly supported by the cutter head driving mechanism 2, thereby being provided on the shield head 11. Yes.

  The orbiting propulsion body 20 is provided in the shield body 12 and circulates so as to slide in the circumferential direction on the end surface of the segment F that is spirally laid on the wall surface of the tunnel in the excavating direction F. Propulsive force in the direction forward F is generated. The propulsion body drive mechanism 30 drives the orbiting propulsion body 20 in an orbit and is attached to the shield body 12. In the example of FIG. 1, since the orbiting propulsion body 20 is entirely formed as a rigid body, the orbiting driving by the propelling body driving mechanism 30 more specifically corresponds to rotational driving. Further, in the example of FIG. 1, the orbiting propulsion body 20 is provided in the shield body 12 by being directly supported by the propulsion body driving mechanism 30.

  The orbiting propulsion body 20 includes an annular body 21 and an internal gear 22 formed on the inner wall surface of the annular body 21. On the other hand, the propulsion body drive mechanism 30 includes an annular frame 31, a power unit 32, and a drive gear 33. The annular frame 31 is attached to the inner wall of the shield body 12 and rotatably supports the annular body 21 of the orbiting propulsion body 20. The power unit 32 is attached to the frame 31 and generates power for rotationally driving the orbiting propulsion body 20, and is, for example, an electric motor or a hydraulic actuator. The drive gear 33 is attached to the drive shaft of the power unit 32 and meshes with the internal gear 22 of the orbiting propulsion body 20, thereby transmitting the rotational force of the power unit 32 to the orbiting propulsion body 20.

  The tilt angle adjusting mechanism 40 is for adjusting the tilt angle between the shield head 11 and the shield body 12 and is provided at the joint between the shield head 11 and the shield body 12. In the example of FIG. 1, the tilt angle adjusting mechanism 40 corresponds to a so-called “half-folded jack” and is configured as a hydraulic jack, and its cylinder portion is attached to the shield body 12 and connected to the piston. Is connected to the shield head 11 through the cutter head drive mechanism 2.

  The erector 50 automatically lays the segment 5 on the wall surface of the tunnel. The erector 50 includes an annular track 51 provided in the shield body 12 and an arm-equipped robot 52 that freely circulates on the annular track 51 to grab and transfer segments. Although not shown, the shield machine 100 is further provided with a control device that controls the cutter head drive mechanism 2, the propellant drive mechanism 30, the tilt angle adjustment mechanism 40, and the erector 50. The control device includes, for example, a computer that operates according to a program. Although not shown in the drawings, the shield machine 100 includes a mud making mechanism that forms mud from excavated soil generated by excavating the cutter head 1, a screw conveyor that carries the mud to the rear R in the excavating direction, and the like. It can be installed as appropriate. The orbiting propulsion body 20 and the propulsion body driving mechanism 30 are formed in an approximately annular shape, and a wide space is secured inside thereof, so that it is easy to install the erector 50, the screw conveyor, and the like inside the shield 10. .

  FIG. 2 is an external perspective view of the orbiting propulsion body 20. The end surface of the annular propulsion body 20 on the rear side R in the excavation direction is formed in a spiral shape. The segments 5 (FIG. 1) are spirally arranged along the spiral rear end surface. The rear end surface of the annular body 21 forms a single spiral surface over the entire circumference with a central angle of 360 °. By making the pitch P of the spiral surface accompanying one rotation coincide with the excavation direction width W (FIG. 1) of the segment 5, every time the orbiting propulsion body 20 makes one revolution, the layer 5 of the layer 5 spirals over one revolution. Can be laid. It is also possible to set the pitch P to, for example, twice the excavation direction width W of the segment 5, and in this case, every time the revolution propulsion body 20 makes one revolution, the two layers of the segment 5 are spread over one revolution Can be laid in a spiral.

  A row of rollers 23 is arranged along the circumferential direction on the spiral rear end surface of the annular body 21. These rollers 23 roll on the front end surfaces of the segments 5 arranged in a spiral when the orbiting propulsion body 20 rotates. Thereby, the friction between the orbital propelling body 20 and the segment 5 can be reduced. Therefore, the rotational driving force applied from the propulsion body drive mechanism 30 to the orbiting propulsion body 20 is efficiently converted into the propulsion force.

  FIG. 3 is a rear view of the orbiting propulsion body 20. FIG. 3 clearly shows the positional relationship between the internal gear 22 and the drive gear 33. That is, the internal gear 22 is formed along the inner periphery of the annular body 21 that is the main body portion of the orbiting propulsion body 20. And the drive gear 33 provided in the drive shaft of the motive power part 32 (FIG. 1) of the propulsion body drive mechanism 30 is arrange | positioned so that it may mesh with this internal gear 22. FIG. In particular, the drive gear 33 and the power unit 32 that drives the drive gear 33 are provided on the ceiling of the shield 10. This also makes it easy to install equipment such as the erector 50 and the screw conveyor inside the shield 10. In addition, it is also preferable for the safety of workers entering the shield 10.

  Returning to FIG. 1, since the shield machine 100 is configured as described above, it operates as follows. By being rotationally driven by the propulsion body drive mechanism 30, the orbiting propulsion body 20 slides in the circumferential direction on the front end face of the segment 5 laid spirally on the wall surface of the tunnel. Since the front end surface of the segment 5 forms a spiral surface, the orbiting propulsion body 20 obtains a propulsive force toward the front F in the excavation direction due to the reaction from the segment 5. This propulsive force is transmitted to the propulsion body drive mechanism 30 that supports the orbital propulsion body 20, and is further transmitted to the cutter head 1 through the shield body 12, the tilt angle adjustment mechanism 40, and the cutter head drive mechanism 2. The cutter head 1 obtains a propulsive force toward the front F in the excavation direction, and is further driven to rotate by the cutter head drive mechanism 2, whereby the excavation of the natural ground in the front F in the excavation direction can be advanced. Since the orbiting propulsion body 20 is used to obtain the propulsive force, a large number of propulsion jacks required in the prior art are not required.

  After the final segment 5 is installed on the inner wall of the tunnel by the collector 50, if the rotation of the orbiting propulsion body 20 exceeds the length (peripheral length) L along the circumference of the segment 5, a gap in which a new segment 5 can be installed However, it is born between the annular body 21 of the orbital propelling body 20 and the already installed segment 5. At this time, the collector 50 grabs the new segment 5 and places it in the gap. Meanwhile, the orbiting propulsion body 20 does not need to stop. In other words, the shield machine 100 can lay the segment 5 on the inner wall of the tunnel while continuously advancing excavation of the front ground without stopping the application of the propulsive force to the cutter head 1. That is, the shield machine 100 realizes high work efficiency.

  In addition, when the pitch P of the spiral surface of the rear end surface of the annular body 21 of the orbiting propulsion body 20 coincides with the excavation direction width W of the segment 5, the gap formed along with the rotation of the orbiting propulsion body 20 Segments 5 are laid one layer at a time. On the other hand, when the pitch P is set to, for example, twice the excavation direction width W of the segment 5, the segment 5 is laid in two layers in the gap formed as the rotating propulsion body 20 rotates. The

  Further, the shield 10 is divided into a shield head 11 provided with the cutter head 1 and a shield body 12 provided with the orbiting propulsion body 20, and an inclination angle between these is adjusted by an inclination angle adjusting mechanism 40. So you can change the direction of excavation. For this reason, not only a straight traveling tunnel but also a tunnel having a curve can be easily formed. Further, since the propulsion body drive mechanism 30 that rotationally drives the orbiting propulsion body 20 is provided in the shield body 12 like the orbiting propulsion body 20, through a simple transmission structure of the drive gear 33 and the internal gear 22 that mesh with each other, The orbiting propulsion body 20 can be rotationally driven by the propulsion body drive mechanism 30.

  FIG. 4 is a perspective view showing another example of the orbiting propulsion body used in the shield machine 100. FIG. In the orbiting propulsion body 20 shown in FIGS. 1 and 2, a single spiral surface is formed on the rear end surface of the annular body 21 over the entire circumference with a central angle of 360 °. On the other hand, on the rear end surface of the annular body 21A of the orbiting propulsion body 20A illustrated in FIG. 4, a single spiral surface is formed for each arc having a central angle of 90 ° formed by dividing the entire circumference into four. The spiral surface repeats irregularities in the excavation direction every 90 ° central angle. By using the orbiting propulsion body 20A formed in this way, as illustrated in FIG. 5, every time the orbiting propulsion body 20A makes one revolution, the segment is formed along the four-layered spiral bands A1 to A4. 5 can be arranged. Each time the orbiting propulsion body 20A rotates by an arc length corresponding to the circumferential length L of the segment 5 (FIG. 1), gaps in which new segments 5 can be disposed are created at four locations along the circumferential direction. Therefore, every time the orbiting propulsion body 20 </ b> A rotates by an arc length corresponding to the circumferential length L of the segment 5, new segments 5 can be laid at four locations.

  In the example of FIG. 5, the pitch P (FIG. 4) of the spiral surface for each central angle of 90 ° matches the width W of the segment 5 in the excavation direction. On the other hand, when the pitch P is set to, for example, twice the width W, two layers of segments 5 are laid in each of the spiral bands A1 to A4, for example, the band A1. It becomes.

  FIG. 6 is a perspective view showing still another example of the orbiting propulsion body used in the shield machine 100. Unlike the above-described orbiting propulsion bodies 20 and 20A, the orbiting propulsion body 20B does not have a spiral surface formed on the rear end face of the annular body 21B, and has a substantial height from the rear end face to the rearward R in the excavation direction. It has a row of protruding rollers 23B. The row | line | column of the roller 23B is arrange | positioned along the circumferential direction, and rolls on the front end surface of the segment 5 arrange | positioned helically with rotation of the rotation propulsion body 20B.

  In this orbiting propulsion body 20B, six rollers 23B are arranged at equal intervals. Therefore, the orbiting propulsion body 20A in FIG. 4 has a single circular arc having a central angle of 60 ° formed by dividing the entire circumference into six. It can be used in the same way that it has been modified to form a helical surface. That is, it becomes possible to arrange the segments 5 along the spiral bands A1 to A6 that expand the example of FIG. Further, in the orbiting propulsion body 20B of FIG. 6, if six rollers 23B are arranged at equal intervals instead of four, it can be used in the same manner as the orbiting propulsion body 20A of FIG.

  FIG. 7 is an explanatory view showing another example in which segments are laid by the shield machine 100 using the orbiting propulsion body 20B of FIG. In the example of FIG. 7, hexagonal segments 5B are laid. The segment 5B has an inclined surface in which the end surface of the front F in the excavation direction is inclined in the excavation direction along the circumferential direction. The roller 23B rolls on the inclined surface as the annular body 21B of the orbiting propulsion body 20B rotates. As a result, the orbiting propulsion body 20B obtains a propulsive force toward the front F in the excavation direction by the reaction from the segment 5B. When the roller 23B reaches the non-inclined surface of the front end surface of the segment 5B, a gap for arranging a new segment 5B (represented by a two-dot chain line in FIG. 7) is created between the adjacent rollers 23B. Therefore, a new segment 5B is laid by the collector 50 while the roller 23B is on the non-inclined surface. Thereafter, the roller 23B rolls on the inclined surface of the front end surface of the newly laid segment 5B, so that the orbiting propulsion body 20B obtains a propulsive force again. Thus, the shield machine 100 using the orbiting propulsion body 20B can advance the excavation of the front ground and the laying of the segment 5B.

  Note that the hexagonal segment 5B can also be viewed as being laid in a spiral shape. According to this view, the roller 23B rolls on the front end surface of the segment 5B laid in a spiral shape (the locus of the roller 23B is indicated by an arrow in FIG. 7). In this way, even when the segment is “laid in a spiral”, depending on the shape of the segment, the propulsive force can be obtained so as to continuously move forward F in the excavation direction as the rotating propulsion body 20B rotates. Is not necessarily required. There may be a suspension period in the propulsion force, or there may be a period in which the orbiting propulsion body 20B moves backward R in the excavation direction. As a whole, it is sufficient if the orbiting propulsion body 20B moves forward F in the excavation direction.

  FIG. 8 is an explanatory view showing still another example in which segments are laid by the shield machine 100 using the orbiting propulsion body 20B. In the example of FIG. 7, approximately one hexagonal segment 5B is disposed between adjacent rollers 23B, but in the example of FIG. 8, approximately two hexagonal segments 5C are laid. That is, the interval between the adjacent rollers 23B coincides with the arrangement pitch of the segments 5B in FIG. 7 in the circumferential direction, but coincides with twice the arrangement pitch of the segments 5C in FIG. In the example of FIG. 8, a new segment 5C can be laid while the roller 23B is rolling on the inclined surface of the front end surface of the segment 5C. For this reason, work efficiency improves.

  Since the new segment 5C can be laid while the roller 23B is on the inclined surface of the front end surface of the segment 5C, the segment 5C can be moved even if the front end surface of the segment 5C has no non-inclined surface. It can be laid. That is, instead of the hexagonal segment 5C, a rhombus segment can be laid. As a result, it is possible to lay the segments while continuously advancing excavation without the suspension period of propulsion. That is, work efficiency is further improved. Note that the diamond-shaped segment or the hexagonal segment 5C shown in FIG. 8 can also be viewed as being spirally laid.

  In the orbiting propulsion body 20B illustrated in FIG. 6, a bearing protruding in a rod shape from the rear end surface of the annular body 21B supported the roller 23B. On the other hand, a bearing that protrudes in a triangular shape from the rear end face of the annular body 21C may support the roller 23C, as in the orbiting propulsion body 20C illustrated in FIG. The orbiting propulsion body 20C has an advantage that the bearing has a more robust structure and is excellent in durability.

(Embodiment 2)
FIG. 10 is a longitudinal sectional view showing the configuration of the shield machine according to the second embodiment of the present invention. The shield machine 200 is mainly a mechanism for adjusting the relative inclination angle between the shield head 11D and the shield body 12D formed by dividing the shield 10D, and the shield machine 100 (FIG. 1) according to the first embodiment. Is different. Furthermore, instead of the orbiting propulsion body 20, an orbiting propulsion body 20C illustrated in FIG. 9 is used. More specifically, the shield machine 200 includes, as main components, the cutter head 1, the cutter head driving mechanism 2, the cylindrical shield 10D, the orbiting propulsion body 20C, the propulsion body driving mechanism 30, as the shield machine 100. And an erector 50. The shield machine 200 further includes, as main components, a cylindrical slide body 80, a front cylindrical body drive mechanism 60, and a rear cylinder as another inclination angle adjustment mechanism instead of the inclination angle adjustment mechanism 40 of the shield machine 100. A solid body drive mechanism 70 and a connection mechanism 90 are provided. Although not shown, the shield machine 200 includes a cutter head driving mechanism 2, a propelling body driving mechanism 30, an inclination angle adjusting mechanism 40, an erector 50, a front cylindrical body driving mechanism 60, and a rear cylindrical body driving mechanism 70. A control device for controlling is further provided.

  FIG. 11 is a perspective view showing the structure of the coupling mechanism 90. The connecting mechanism 90 connects the shield head 11D and the shield body 12D, and more specifically, the shield head 11D and the shield body 12D are connected so as to be relatively tiltable in all directions. It is configured as a universal joint. That is, the connection mechanism 90 includes an annular connection member 91, a first support member 92, and a second support member 93. The annular connecting member 91 is disposed near the joint between the shield head portion 11D and the shield body portion 12D, and is located inside the shield head portion 11D and the body portion 12D, and has a cylindrical sliding body 80 (FIG. 10). It is arranged around it so as not to interfere with. A first support member 92 is provided at a pair of diagonal positions of the annular connecting member 91, and a second support member 93 is provided at another pair of diagonal positions. In the example of FIG. 11, the axis connecting the pair of diagonal positions where the first support member 92 is provided and the axis connecting the pair of diagonal positions where the second support member 93 is provided are orthogonal to each other. . The first support member 92 rotatably supports the shield head 11D, and is configured as a pin in the example of FIG. The second support member 93 supports the shield body 12 </ b> D so as to be rotatable, and is configured as a pin in the example of FIG. 11, similarly to the first support member 92. A cutout 94 is formed in the shield body 12D in order to avoid interference between the shield body 12D and the first support member 92.

  FIG. 12 is a perspective view showing the configuration of the cylindrical sliding body 80. The cylindrical sliding body 80 has a front cylindrical body 81 and a rear cylindrical body 82. The front cylindrical body 81 and the rear cylindrical body 82 correspond to one and the other formed by diagonally cutting a single cylindrical body, and are in contact with each other on the rounded surface. . An internal gear 83 is formed for the front cylindrical body 81 and an internal gear 84 for the rear cylindrical body 82 on the inner peripheral surface near the end located on the opposite side to the surfaces that contact each other. Is formed. The internal gear 83 is a gear for receiving power for rotationally driving the front cylindrical body 81, and the internal gear 84 is a gear for receiving power for rotationally driving the rear cylindrical body 82.

  FIG. 12 shows a state in which the front cylindrical body 81 and the rear cylindrical body 82 are formed by cutting the single cylindrical body as if it is diagonally cut and the rotational position is not changed. For convenience, the rotation angle θ1 of the front cylindrical body 81 and the rotation angle θ2 of the rear cylindrical body 82 are determined with reference to this rotational position. As illustrated in FIG. 12, the rotation angles θ <b> 1 and θ <b> 2 are positive (> 0) when viewed clockwise from the opposite side of the contact surfaces of the cylindrical bodies 81 and 82. The rotation angles θ1 and θ2 of the cylindrical bodies 81 and 82 illustrated in FIG. 12 are “0”. At this time, the central axes of the cylindrical bodies 81 and 82 are the same, and the cylindrical bodies 81 and 82 are not relatively inclined. In the example of FIG. 12, the contact surfaces of the cylindrical bodies 81 and 82 when the rotation angles θ1 and θ2 are “0” are not inclined to the left and right, and their normal lines are the vertical axis and the central axis. Is located in a plane defined by

  FIG. 13 is a top view showing the operation of the cylindrical sliding body 80. As shown in FIG. 13A, when the rotation angles θ1 and θ2 of the cylindrical bodies 81 and 82 are “0”, the central axis 85 of the cylindrical body 81 and the central axis 86 of the cylindrical body 82 are Match each other. That is, the relative inclination angle between the cylindrical bodies 81 and 82 is “0”. On the other hand, as shown in FIG. 13B, when the rotation angles θ1 and θ2 of the cylindrical bodies 81 and 82 are “+ 90 °”, the central axis 85 of the cylindrical body 81 and the central axis of the cylindrical body 82 86 intersects with the maximum angle. That is, the cylindrical bodies 81 and 82 are relatively inclined to the left and right with the maximum angle. As the rotation angles θ1 and θ2 of the tubular bodies 81 and 82 approach from “0” to “+ 90 °”, the tubular bodies 81 and 82 are greatly inclined to the left and right. Further, as the rotation angles θ1 and θ2 of the cylindrical bodies 81 and 82 approach from “+ 90 °” to “+ 180 °”, the left and right inclinations of the cylindrical bodies 81 and 82 become smaller, and the rotation angles θ1 and θ2 become “ When it is “180 °”, the inclination angle is “0” as in FIG. In addition, when the rotation angles θ1 and θ2 of the cylindrical bodies 81 and 82 are negative, the cylindrical bodies 81 and 82 are inclined in a direction opposite to that when the rotation angles θ1 and θ2 are positive.

  As described above, the cylindrical bodies 81 and 82 can be relatively inclined to the left and right by rotating them by the same rotation angles θ1 and θ2. On the other hand, the cylindrical bodies 81 and 82 can be inclined in various directions by making the rotation angles θ1 and θ2 different from each other. For example, by setting the rotation angle θ1 of the front cylindrical body 81 to “180 °” and the rotation angle θ2 of the rear cylindrical body 82 to “0”, the cylindrical bodies 81 and 82 can be relatively relative to each other with the maximum angle. Can be inclined in the vertical direction.

  The shape of the contact surface of the cylindrical bodies 81 and 82 is preferably a ring. In that case, the cross-sectional shapes of the cylindrical bodies 81 and 82 on the cutting plane perpendicular to the central axes 85 and 86 are elliptical rings. If the shape of the contact surfaces of the cylindrical bodies 81 and 82 is a ring, no matter what rotation angle θ1 or θ2 the cylindrical bodies 81 and 82 rotate, the radially inward between the contact surfaces And no protruding part to the outside.

  Returning to FIG. 10, the front cylindrical body driving mechanism 60 is disposed in the shield head 11 </ b> D and rotationally drives the front cylindrical body 81. The rear cylindrical body driving mechanism 70 is disposed in the shield body 12D and rotationally drives the rear cylindrical body 82. More specifically, the front cylindrical body drive mechanism 60 has an annular frame 61, a power unit 62, and a drive gear 63. The annular frame 61 is attached to the inner wall of the shield head 11D and / or the cutter head drive mechanism 2, and supports the front tubular body 81 in a rotatable manner. The power unit 62 is attached to the frame 61 and generates power for rotationally driving the front cylindrical body 81, and is, for example, an electric motor or a hydraulic actuator. The drive gear 63 is attached to the drive shaft of the power unit 62 and meshes with the internal gear 83 of the front cylindrical body 81, thereby transmitting the rotational force of the power unit 62 to the front cylindrical body 81.

  Similarly, the rear cylindrical body drive mechanism 70 includes an annular frame 71, a power unit 72, and a drive gear 73. The annular frame 71 is attached to the inner wall of the shield body 12D and / or the frame 31 of the propelling body drive mechanism 30, and supports the rear cylindrical body 82 to be rotatable. The power unit 72 is attached to the frame 71 and generates power for rotationally driving the rear cylindrical body 82, and is, for example, an electric motor or a hydraulic actuator. The drive gear 73 is attached to the drive shaft of the power unit 72 and meshes with the internal gear 84 of the rear cylindrical body 82, thereby transmitting the rotational force of the power unit 72 to the rear cylindrical body 82.

  The front cylindrical body driving mechanism 60 and the rear cylindrical body driving mechanism 70 that rotate and drive the front cylindrical body 81 and the rear cylindrical body 82, respectively, are connected to the shield head 11D that is relatively tiltable. Since each is installed in the shield body 12D, the relative direction of the central axis between the front tubular body 81 and the rear tubular body 82 changes, so that the shield body 11D and the shield body 12D The relative direction of the central axis between the two will change. That is, by rotating and driving the front cylindrical body 81 and the rear cylindrical body 82, the shield head 11D is used without using a large number of jacks for adjusting the tilt angle (that is, the bent jacks) required by the prior art. And the inclination angle between the shield body 12D can be adjusted.

  Since the front cylindrical body 11D and the rear cylindrical body 12D are each cylindrical, a space is secured inside them. For this reason, it is easy to install other equipment such as a mud carrying screw conveyor in the shield 10D. Further, the drive gears 63 and 73 and the power units 62 and 72 for driving them are provided on the ceiling of the shield 10D. This also means that equipment such as a screw conveyor is installed inside the shield 10. It is easy. Further, it is also preferable for the safety of an operator who enters the shield 10.

(Embodiment 3)
The circumferential propulsion bodies 20 and 20A to 20C according to the first and second embodiments respectively have rigid annular bodies 21 and 21A to 21C as a whole, and are driven to rotate by the propulsion body drive mechanism 30. On the other hand, it is also possible to configure the orbiting propulsion body so that it can be flexibly deformed. FIG. 14 is a perspective view of an orbiting propulsion body showing an example thereof. This orbiting propulsion body 20E is configured such that the annular body 21B of the orbiting propulsion body 20B (FIG. 6) can be deformed. As shown in an overall perspective view in FIG. 14A, the annular propulsion body 20 </ b> E has an annular body 21 </ b> E having a series of connecting pieces 25. As shown in FIG. 14B, each connecting piece 25 is connected to the adjacent connecting piece 25 by a pin 27 serving as a rotating shaft. That is, the circumferential end of the main body portion 26 of the connecting piece 25 has a hinge structure, so that the adjacent connecting piece 25 can rotate relatively around an axis along the excavation direction (F or R). It is possible to move. As an example, the pin 27 is locked by the split pin 28. An internal gear 22 for one connecting piece is formed on the inner periphery of each connecting piece 25. Further, some of the connecting pieces 25 are provided with rollers 23E on the rear end surfaces thereof.

  FIG. 15 shows a configuration in which the annular body 21C of the orbiting propulsion body 20C (FIG. 9) can be deformed. As with the orbiting propulsion body 20E shown in FIG. 14, the orbiting propulsion body 20F has an annular body 21F having a series of connecting pieces 29. Each connecting piece 29 is rotatable relative to an adjacent connecting piece 29 around an axis along the excavation direction (F or R) by a hinge structure. The series of connecting pieces 29 are alternately provided with rollers 23F on the rear end face.

  In the orbiting propulsion bodies 20E (FIG. 14) and 20F (FIG. 15), the degree of deformation, that is, the flexibility is increased as the circumferential width of each connecting piece 25, 29 is reduced and the number of connecting pieces 25, 29 is increased. The degree of height increases. Further, as illustrated in FIG. 16, it is also possible to configure the orbiting propulsion body 20G so as to have a chain-like annular body 21G. The annular body 21G has an annular shape by alternately connecting the connecting pieces 121 and 122 such that the connecting pieces 121 and 122 are relatively rotatable. A roller 23G is provided on a rear end surface of a part of the connecting piece 121. Since the annular body 21G has a chain structure as a whole, it is not necessary to separately provide the internal gear 22 in order to receive circular driving by the propulsion body driving mechanism 30. That is, the drive gear 33 of the propulsion body drive mechanism 30 can drive the orbiting propulsion body 20G by meshing with the annular body 21G having a chain structure.

  A chain may be arranged in place of the internal gear 22 in the orbiting propulsion body 20E (FIG. 14) or 20F (FIG. 15). The orbiting propulsion body (not shown) configured as described above can also be driven by the propulsion body driving mechanism 30 in the same manner as the orbiting propulsion body 20G. In this case, each connecting piece may be connected by a hinge structure similarly to the connecting piece 21E or 21F, but adjacent connecting pieces may be connected by a chain. In this case, there may be a gap between adjacent connecting pieces. Not only the orbiting propulsion bodies 20B and 20C but also the orbiting propulsion bodies 20 (FIG. 2) and 20A (FIG. 4) have a hinge structure as in the orbiting propulsion bodies 20E (FIG. 14) or 20F (FIG. 15). It is also possible to have a series of connected pieces or a series of connected pieces connected by a chain. Even when connected by a chain, each of the series of connecting pieces is still connected to the adjacent connecting pieces so as to be relatively rotatable around an axis along the excavation direction.

  FIG. 17 is a cross-sectional view showing a schematic structure of a shield machine using a flexible orbiting propulsion body 20P. The orbiting propulsion bodies 20E to 20G shown in FIGS. 14 to 16 correspond to an example of the orbiting propulsion body 20P. In this shield machine 300, the orbiting propulsion body 20P is slidably supported on the inner periphery of an annular frame 31P attached to the inner wall of the shield body 12P. The frame 31P is a constituent element of a propelling body drive mechanism (not shown), like the frame 31 (FIG. 1). Since the orbiting propulsion body 20P can be flexibly deformed, the guides 35 are arranged at appropriate intervals along the circling direction so that the orbiting propulsion body 20P follows a predetermined orbit. The guide 35 has a gear similar to the drive gear 33 (FIGS. 1 and 3), for example, and guides the orbiting propulsion body 20P by meshing with an internal gear 22 provided on the orbiting propulsion body 20P, for example. Part, for example, one or more of the guides 35 drives the orbiting propulsion body 20P, and is, for example, a drive gear 33. Since the orbiting propulsion body 20P can be flexibly deformed, by using the orbiting propulsion body 20P as illustrated in FIG. 17, the cross-sectional shape of the shield including the shield body 12P can be changed to a shape other than a circle. . In the example of FIG. 17, the cross-sectional shape of the shield is substantially rectangular.

  FIG. 18 is a cross-sectional view showing a schematic structure of a shield machine using a flexible orbiting propulsion body 20R. Similarly to the orbiting propulsion body 20P, the orbiting propulsion bodies 20E to 20G illustrated in FIGS. 14 to 16 correspond to an example of the orbiting propulsion body 20R. In this shield machine 400, the orbiting propulsion body 20R is slidably supported on the inner periphery of an annular frame 31R attached to the inner wall of the shield body 12R. The frame 31R is a constituent element of a propelling body drive mechanism (not shown), like the frame 31P (FIG. 17). Similar to the orbiting propulsion body 20P, the guides 35 are arranged at appropriate intervals along the orbiting direction of the orbiting propulsion body 20R. A part of the guide 35 drives the orbiting propulsion body 20R, and is, for example, a drive gear 33. The shield machine 400 is configured as a so-called triple machine. Even in the shield machine 400 whose cross-sectional shape is significantly different from the circular shape in this way, the orbiting propulsion body 20R circulates along the laid segments 5, 5B and 5C, in other words, along the inner periphery of the shield. Thus, it becomes possible to obtain a propulsive force toward the front F in the excavation direction. As shown in the examples of FIGS. 17 and 18, the “cylindrical shield” included in the shield machine of the present invention is not limited to the cylindrical shield. Of course, it is possible to adopt an ellipse or an arch as the cross-sectional shape of the cylindrical shield.

  The orbiting propulsion bodies 20E, F, G, P, and R that can be flexibly deformed are also used for a shield machine having a shield 10 having a circular cross section, such as the shield machine 100 (FIG. 1) or 200 (FIG. 10). It can be used with the guide 35. Thereby, even if the shield 10 is deformed by the pressure of the natural ground, the orbiting propulsion body 20E and the like can flexibly follow the deformation.

(Other embodiments)
(A) As the shield machine 100 according to the first embodiment, an example in which the shield 10 is divided into the shield head 11 and the shield head 12 is shown. The same applies to the shield machine 200 according to the second embodiment. On the other hand, it is also possible to implement a shield machine in which the shield 10 is divided into three or more parts. The shield head 11 provided with the cutter head 1 and the shield body 12 provided with the orbiting propulsion body 20 and the propulsion body drive mechanism 30 may be included. Further, it is possible to implement a shield machine in which the shield 10 is not divided and therefore does not include the tilt angle adjusting mechanism 40 and the orbiting propulsion body 20 and the propulsion body driving mechanism 30 are provided in the shield 10. is there. All of these also constitute one aspect of the present invention. Further, as a modified form of the shield machine 200 according to the second embodiment, it is possible not to include the orbiting propulsion body 20C and the propulsion body drive mechanism 30, and to implement a form using, for example, a conventional propulsion jack instead. . Also in this form, it is possible to eliminate the need for a large number of bent jacks. This form also forms another aspect of the present invention.

(B) In the connection mechanism 90 shown in FIGS. 10 and 11, the example in which the connection member 91 is disposed inside the shield head portion 11D and the shield body portion 12D is shown. On the other hand, you may arrange | position between shield head 11D and shield trunk | drum 12D. In this case, the notch 94 shown in FIG. 11 is unnecessary.

(C) In the shield machine 200 according to the second embodiment, since the coupling mechanism 90 is configured as a universal joint, the shield head 11D and the shield body 12D are relatively inclined over all 360 ° directions. Is possible. Accordingly, it is possible to easily form a tunnel whose traveling direction is curved left and right, up and down, or diagonally. On the other hand, the coupling mechanism 90 can be configured to limit the direction in which the shield head 11D and the shield body 12D are inclined. For example, the shield head 11D and the shield body 12D may be coupled so as to be relatively inclined only in the left-right direction. As illustrated in FIG. 13, if the rotation angle θ1 of the front tubular body 81 and the rotation angle θ2 of the rear tubular body 82 are controlled to be the same, the shield head 11D and the shield body It is sufficient that 12D is connected so as to be relatively inclined only in the left-right direction.

(D) In the shield machine 200 according to the second embodiment, the cylindrical sliding body 80 may have a rolling element such as a roller interposed between the front cylindrical body 81 and the rear cylindrical body 82. For example, a roller may be disposed on one contact surface of the front cylindrical body 81 and the rear cylindrical body 82 along the circumferential direction, similarly to the rear end surface of the annular body 21 in FIG. Or the annular groove | channel may be formed along the circumferential direction of both contact surfaces, and the ball bearing which rolls in the said groove | channel may be arrange | positioned. Thereby, the friction between the contact surfaces accompanying the rotation of the front cylindrical body 81 and the rear cylindrical body 82 can be reduced.

(E) In the shield machines 100 and 200 according to the first and second embodiments, the cutter head driving mechanism 2 allows the cutter head 1 to excavate a natural ground in front by rotating the cutter head 1. . However, in general, the cutter head driving mechanism 2 may be any mechanism that drives the cutter head 1 so as to excavate a front mountain. For example, the cutter head 1 can be swung in the left-right, up-down, or diagonal directions, Or may be made to swing.

DESCRIPTION OF SYMBOLS 1 Cutter head 2 Cutter head drive mechanism 5, 5B, 5C Segment 10, 10D Shield 11, 11D Shield head 12, 12D Shield body 20, 20A, 20B, 20C, 20E, 20F, 20G, 20P, 20R 21, 21A, 21B, 21C, 21E, 21F, 21G Ring 22 Internal gear 23, 23B, 23C, 23E, 23F, 23G Roller (rolling element)
25, 29 Connecting piece 30 Propulsion body drive mechanism 31, 31P, 31R Frame 32 Power section 33 Drive gear 35 Guide 40 Inclination angle adjustment mechanism 60 Front cylindrical body drive mechanism 70 Rear cylindrical body drive mechanism 61, 71 Frame 62, 72 Power unit 63, 73 Drive gear 80 Cylindrical sliding body 81 Front cylindrical body 82 Rear cylindrical body 83, 84 Internal gear 90 Connection mechanism 91 Connection member 92 First support member 93 Second support member F Excavation direction front R Excavation Direction back 100, 200 Shield machine

Claims (8)

A shield machine that digs a natural ground to form a tunnel and lays a segment on the wall surface of the tunnel such that a front end surface of the segment has an inclined surface that is inclined in the excavation direction along the circumferential direction. ,
A cylindrical shield,
A circulating propulsion body that generates a propulsive force forward in the excavation direction by circulating around the front end surface of the segment installed in the shield and laid on the wall surface of the tunnel, and
A propulsion body drive mechanism that is installed in the shield and circulates and drives the orbiting propulsion body;
A cutter head that is provided at the front end of the shield in the excavation direction and excavates a natural ground ahead;
A cutter head driving mechanism that is installed in the shield and drives the cutter head to excavate the ground on the front surface;
Shield machine equipped with.   The rotation propulsion body includes an annular body that is circularly driven by the propulsion body drive mechanism, and a rolling element that is provided on a rear end surface of the annular body in a digging direction and rolls on the front end surface of the segment. The shield machine according to 1. The circular propulsion body further has an internal gear formed on the inner wall surface of the annular body,
The shield machine according to claim 2, wherein the propulsion body drive mechanism has a drive gear that meshes with the internal gear, and drives the orbiting propulsion body through the drive gear. The orbiting propulsion body has a series of connecting pieces connected in an annular shape, and each of the series of connecting pieces is relatively rotatable around an adjacent connecting piece and an axis along the excavation direction. Connected to
The shield machine according to any one of claims 1 to 3, wherein the propulsion body drive mechanism includes a guide for guiding the orbiting propulsion body along a predetermined path. The cylindrical shield has a shield head and a shield body that are divided from each other,
The cutter head is provided on the shield head,
The circling propulsion body and the propulsion body drive mechanism are provided in the shield body,
The shield machine is
The shield machine according to any one of claims 1 to 4, further comprising an inclination angle adjustment mechanism for adjusting an inclination angle between the shield head and the shield body. A coupling mechanism that couples the shield head and the shield body so as to be relatively tiltable;
The tilt angle adjusting mechanism is
A front cylindrical body and a rear cylindrical body that correspond to one and the other formed by cutting the cylindrical body into a ring, and abut against each other on the surface that has been cut;
A front cylindrical body drive mechanism that is installed in the shield head and rotationally drives the front cylindrical body;
The shield machine according to claim 5, further comprising: a rear cylindrical body driving mechanism that is installed in the shield body and rotationally drives the rear cylindrical body. A shield machine that excavates natural ground to form a tunnel and lays a segment on the wall of the tunnel,
A cylindrical shield,
A propulsive force generating mechanism that is installed in the shield and presses the front end surface in the digging direction of the segment laid on the wall surface of the tunnel, and generates a propulsive force forward in the digging direction by its reaction;
A cutter head that is provided at the front end of the shield in the excavation direction and excavates the ground in the front;
A cutter head driving mechanism that is installed in the shield and drives the cutter head to excavate the ground on the front surface;
With
The cylindrical shield has a shield head and a shield body that are divided from each other,
The cutter head is provided on the shield head,
The propulsive force generation mechanism is provided in the shield body,
The shield machine is
A coupling mechanism that couples the shield head and the shield body so as to be relatively tiltable;
An inclination angle adjusting mechanism for adjusting an inclination angle between the shield head and the shield body, and
The tilt angle adjusting mechanism is
A cylindrical body is formed into a shape that is divided into diagonally rounded sections, and a front cylindrical body and a rear cylindrical body that are in contact with each other on the rounded surface,
A front cylindrical body drive mechanism that is installed in the shield head and rotationally drives the front cylindrical body;
A shield machine, comprising: a rear cylindrical body drive mechanism that is installed in the shield body and rotationally drives the rear cylindrical body. The coupling mechanism is
An annular connecting member disposed around the front cylindrical body and the rear cylindrical body;
A first support member that rotatably supports the shield head at a pair of diagonal positions of the connecting member;
The shield machine according to claim 6, further comprising: a second support member that supports the shield body so as to be rotatable at another pair of diagonal positions of the connecting member.