JP2007120186A - Shield machine and attitude shifting method using this shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine and an attitude shifting method of the shield machine capable of efficiently shifting an attitude of the shield machine. <P>SOLUTION: A hood part 3 is composed of a movable hood 29 tilting toward the inside of the shield machine 1 and a fixed hood 31. The movable hoods 29 are arranged, for example, by 10 places in total in positions in the horizontal direction and the vertical direction to the axis of respective main shields 15. A driving mechanism 33 for tilting the respective movable hoods 29 are also respectively arranged inside a skin plate 9, and the respective movable hoods 29 can independently tilt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield machine and a method for changing the attitude of the shield machine, and more particularly, to a shield machine effective for attitude change and an attitude change method using the shield machine.

  In general, the shield machine has a hood part that excavates the face at the front part in the advancing direction, a tail part that performs lining at the rear part, a girder part that connects the hood part and the tail part and is equipped with propulsion equipment etc. The skin plate which consists of a cylindrical steel shell for protecting each part mentioned above with respect to the load which acts from the outside is provided. Shield jacks are provided at equal intervals close to the inside of the skin plate, and are installed in an annular shape so that a propulsive load acts evenly on the entire circumference of the segment.

  The attitude of the shield machine is changed mainly by setting the power point by selecting a shield jack. In other words, when only the selected shield jack is operated, the shield machine on the selected shield jack side advances ahead of the shield machine on the unselected shield jack side. Posture change is performed. In addition, as an auxiliary method of changing the attitude of the shield machine, an overcutter with an overcutter, copy cutter, etc. is performed, and the shield machine's attitude change side (for example, the left side of the face when the shield machine is propelled to the left) is free. A method of increasing the degree is used.

  Further, for example, Non-Patent Document 1 discloses a method of attaching a movable sled device to the central portion of the shield machine body as a method for changing the attitude of the shield machine during curve construction or meandering. This movable sled device is installed in the shield machine body, and when changing the attitude of the shield machine, the jack pushes the resistance plate called the sled board outward from the skin plate and presses it against the ground to change the attitude of the shield machine Is to change.

Furthermore, for example, in Patent Document 1, as a method for changing the attitude of the shield machine at the time of rolling, the hood part of the rectangular shield machine is formed in a taper shape, and the excavation cross section of the face is cut by a cutter head having a copy cutter. A method for changing the attitude of a shield machine by changing its shape is disclosed. In this method, the left and right sides of the hood portion are tapered and the upper and lower sides are formed horizontally, and at the same time excavating the face portion located in front of the hood portion with the cutter head, the front portion of the hood portion with a copy cutter In order to change the position of the shield machine, the part is cut out so as to leave a part of the face portion located at the position, and when the shield machine is moved forward, it rides on the uncut part.
Shield construction method, Kashima Publishing Co., issued on December 20, 1981 JP 2000-328873 A

  However, the method of changing the attitude of the shield machine by operating the shield jack is effective for changing the attitude when the segment for making the reaction force material of the shield jack is not annular but is constructed in a substantially U shape. There was a problem that it was difficult to use a proper shield jack and it was difficult to change posture. In addition, in the method of increasing the degree of freedom on the side where the posture is changed by performing an overcutter with an overcutter, a copy cutter, etc., there is a possibility that the ground will be loosened due to the occurrence of an overbori and ground subsidence may occur. there were. In addition, since the backing material has to be injected into the extra moat portion, there is a problem that the material cost of the backing material is excessive. Furthermore, when the filling of the backing material is insufficient, the shield machine nose-downs and rolls, and there is a problem that it takes time and effort to correct the track.

  Moreover, in the method of pressing the movable sled described in Non-Patent Document 1 against the ground to change the posture of the shield machine main body, the movable sled protrudes outward from the skin plate and damages the ground because it pushes the ground. There was a problem. In addition, since the degree of freedom of the shield machine is constrained by the surrounding ground, the effect of changing the posture is small with the movable sled, and in order to change to the desired posture, the movable sled is projected over a long section. There is a problem that this work requires a lot of labor and time.

  Further, in the rectangular shield machine described in Patent Document 1, since the tapered hood portion is fixed, the cross-sectional area of the excavated soil is always constant. In other words, when changing the attitude of the shield machine, even if a left uncut portion is provided in front of the tapered hood portion, the amount of excavated soil taken into the hood portion is not different from the case where no left uncut portion is provided. There is no difference in the degree of freedom of the shield machine. Therefore, there is a problem that the effect of changing the posture is small even when the shield machine is propelled and the tapered hood portion rides on the unexcavated portion.

  On the other hand, even when the shield machine goes straight, the soil outside the fixed taper is not taken into the shield regardless of whether it is excavated or not excavated, so the resistance increases, making it difficult to advance the shield machine There was a problem of becoming.

  Therefore, the present invention has been made in view of the above-described conventional problems, and a shield machine capable of efficiently changing the attitude of the shield machine during curved construction or meandering such as pitching, yawing, and rolling, and It aims at providing the attitude change method of a shield machine.

  In order to achieve the above object, a shield machine of the present invention is a shield machine having a hood portion at a front portion in a traveling direction, wherein the hood portion is divided into a plurality of hoods, and at least a part of the hood is a part of the shield machine. A copy hood configured as a movable hood that can be driven inward, and a drive mechanism for moving the movable hood, and a copy cutter capable of selecting and excavating a part of a face portion positioned in front of the hood portion (Claim 1).

  In the shield machine of the present invention, the hood portion is divided into a plurality of hoods, and at least a part of the hood includes a movable hood that can be driven toward the inside of the shield machine, and a drive mechanism for moving the movable hood. This makes it possible to drive the movable hood toward the inside of the shield machine.

  In addition, the shield machine of the present invention includes a cutter head having a copy cutter capable of excavating by selecting a face portion positioned in front of the hood portion, and thereby a face portion located in front of the movable hood to be driven. Without cutting, it is possible to excavate the face portion located in front of the hood other than the movable hood to be driven.

  Therefore, the movable hood was driven, the face portion located in front of the driven movable hood was not excavated, the face portion located in front of the hood other than the driven movable hood was excavated, and the shield machine was propelled to drive. The earth and sand at the face portion located in front of the movable hood is not taken into the shield machine, but is consolidated by the propulsion of the shield machine body, and a force for pushing out the driven movable hood is generated. And it becomes possible to change the attitude | position of a shield machine by utilizing the force which pushes out this movable hood. That is, even when the shape of the segment is semicircular, U-shaped, etc., and not all shield jacks can be used for posture change, the posture of the shield machine can be changed.

  In addition, excavating the face part located in front of the hood other than the movable hood, and propelling the shield machine to hold the excavated ground in the hood other than the movable hood, thereby preventing the looseness of the ground It becomes possible to prevent land subsidence.

  According to a second aspect, in the first aspect, the movable hood has a front portion in the traveling direction tilted toward the inside of the shield machine.

  Since the movable hood of the present invention is inclined toward the inside of the shield machine, it does not hurt natural ground.

  A third invention is characterized in that, in the first invention, the movable hood can be displaced toward the inside of the shield machine in a state parallel to the central axis of the shield machine.

  Since the movable hood of the present invention is displaced toward the inside of the shield machine, it does not damage the ground.

  According to a fourth aspect of the present invention, there is provided a method for changing the attitude of a shield machine as a movable hood in which a hood provided at a front portion in a traveling direction is divided into a plurality of hoods and at least a part of the hood can be driven toward the inside of the shield machine. In the attitude change method of the shield machine configured, a selection step of selecting a movable hood to be driven for attitude change from among the movable hoods, and a drive for driving the selected movable hood toward the inside of the shield machine And excavating the ground with the cutter head, and excavating only the face portion located in front of the hood other than the selected movable hood, leaving the face portion located in front of the selected movable hood. The shield machine is advanced, the excavated ground is taken into the shield machine, and the front is moved by the driven movable hood. Characterized by converting the posture by consolidating the remaining digging the working face portion.

  In the method for changing the posture of the shield machine according to the present invention, a movable hood to be driven for posture change is selected from the hood portions provided at the front part in the traveling direction, and the selected movable hood is directed toward the inside of the shield machine. At the same time as excavating the natural ground with the cutter head, only the face portion located in front of the hood other than the movable hood is excavated to leave the face portion located in front of the movable hood. The earth and sand of the face portion left behind is not taken into the shield machine even if the shield machine is advanced. Therefore, the earth and sand of the face that has been dug is consolidated simultaneously with the propulsion of the shield machine, generating a force to push out the movable hood, and it is possible to change the position of the shield machine by using this force to push out the movable hood. Become. That is, since the compacted earth and sand changes the attitude of the shield machine using the force that pushes out the movable hood, the attitude can be reliably changed.

  In addition, since the method for changing the attitude of the shield machine of the present invention can be performed after the selection process, it can be applied to the case of using a typical shield machine that promotes the shield machine body at the same time as excavation. Is possible.

  According to a fifth aspect, in the fourth aspect, the driving step and the excavation step are performed in this order or in reverse order.

  In the method for changing the attitude of the shield machine according to the present invention, since the driving process can be performed after the excavation process, a plurality of small shields having a cutter head advance ahead of the shield machine body, and then the shield machine body advances. The present invention can also be applied when using a shield machine.

  According to the shield machine and the attitude change method of the shield machine of the present invention, the attitude of the shield machine can be changed efficiently.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a method for changing the posture when a rectangular shield machine having a plurality of small shields is used will be described.

  FIG. 1 is a front view of a rectangular shield machine according to the first embodiment of the present invention, and FIG. 2 is a side sectional view of the rectangular shield machine according to the first embodiment of the present invention. As shown in FIGS. 1 and 2, the shield machine 1 connects the hood part 3 that excavates the face at the front part in the traveling direction, the tail part 5 that performs lining at the rear part, and the hood part 3 and the tail part 5. A girder part 7 equipped with propulsion equipment and the like is also provided, and a skin plate 9 made of a rectangular cylindrical steel shell is provided for protecting each part described above against a load acting from the outside. Shield jacks 11 are provided at equal intervals close to the inside of the skin plate 9 and are installed in an annular shape so that a propulsive load acts evenly on the entire circumference of the segment 13.

  The shield machine 1 includes a plurality of rectangular main shields 15 which are arranged in a predetermined combination in the skin plate 9 vertically and horizontally, can be independently propelled, and can be independently driven. . The arrangement of the main shield 15 can be an appropriate combination according to the shape and size of the excavation cross section of the tunnel to be constructed. In the present embodiment, for example, the vertical (vertical) direction × the horizontal (horizontal) direction. = 2 (stage) × 3 (column). Each main shield 15 is rotatable to the front side of the shield body 17, a rectangular shield body 17 provided in the hood portion 3 and the girder portion 7 so as to be movable back and forth, a slide jack 19 for moving the shield body 17 forward and backward. A cutter head 23 having a copy cutter 21, a shield body 17, a drive source 25 for driving the cutter head 23 and the copy cutter 21, and a driving force of the drive source 25 for the cutter head 23 and the copy. A power transmission mechanism 27 for transmitting to the cutter 21 is provided, and each main shield 15 is configured to be driven independently.

  The hood section 3 is composed of a movable hood 29 that tilts toward the inside of the shield machine 1 and a fixed hood 31, and the movable hood 29 is positioned horizontally and vertically with respect to the central axis of each main shield 15, for example. A total of 10 places are provided. A drive mechanism 33 for tilting each movable hood 29 is installed inside the skin plate 9, and each movable hood 29 can tilt independently.

  FIG. 3 is a view showing the drive mechanism 33 of the movable hood 29 according to the first embodiment of the present invention. The drive mechanism 33 is fixed to the inner side of the hood part 3, a girder part side bracket 35 fixed to the inside of the girder part, a hood part jack 41 connected to the girder part side bracket 35 via a pin 37. The hood portion side bracket 47 connected to the rod 41a of the hood portion jack 41 via the pin 45, the fulcrum pin 49 connected to the hood portion side bracket 47 as the movable center of the movable hood 29, and the fulcrum pin 49 The support member 51 is used to support the seal member 1 and the sealing material 39 is used to prevent the earth and sand from being inserted into the main body of the shield machine 1.

  The movable hood 29 contracts the hood jack 41 so that the face side of the movable hood 29 tilts to the inside of the shield machine 1 (upper side in FIG. 3) with the fulcrum pin 49 as the center. The movable hood 29 can be fixed by fixing the rod 41a of the hood jack 41 to the partition wall 63 with a fixing member 41b such as a pin. Further, when the hood jack 41 is extended, the movable hood 29 does not tilt inward and has the same shape as the fixed hood 31.

  FIG. 4 is a cross-sectional view of the cutter head 23 according to the first embodiment of the present invention. The cutter head 23 includes a jack 53 provided inside the cutter head 23, and a copy cutter 21 configured to be able to protrude and retract from the outer peripheral portion of the cutter head 23 in conjunction with the expansion and contraction of the jack 53. The cutter head 23 excavates a face portion located in front of the main shield 15 that is inward of the hood portion 3. On the other hand, the copy cutter 21 appears and disappears in conjunction with the rotation angle of the cutter head 23, and a face portion located in front of the fixed hood 31 and the fixed movable hood 29 along the outer periphery of the rectangular surface excavated by the cutter head 23. Only the excavated portion is left, and the face portion located in front of the tilted movable hood 29 is left behind. Expansion and contraction of the jack 53 is controlled by a control device (not shown) that controls the drive source 25.

  FIG. 5 is a cross-sectional view of the girder part 7 and the tail part 5 according to the first embodiment of the present invention. The girder part 7 and the tail part 5 are connected to each other by the middle folding jacks 55 that are installed at equal intervals close to the inside of the skin plate 9. 7 and the tail portion 5 are bent, and the propulsion direction of the shield machine 1 is changed by changing the angle formed between them.

  A discharge device 57 for discharging the excavated earth and sand is connected to the girder unit 7.

  A segment assembling apparatus 59 is provided inside the tail portion 5, and the segment assembling apparatus 59 sequentially assembles the segments 13 on the inner surface of the excavated tunnel, thereby constructing an inner wall of the segments 13.

  Below, the attitude | position change method of the shield machine 1 is demonstrated according to the attitude | position change procedure.

  First, the 1st Example of the attitude | position change method in 1st embodiment is shown.

  FIGS. 6-10 is a figure which shows the attitude | position change method using only the movable hood 29 in the rectangular shield machine 1 which concerns on 1st embodiment of this invention.

  As shown in FIG. 6, in order to change the posture to the right side in the traveling direction (upper side of the plane of the drawing) in the tunnel using the shield machine 1 configured as described above, first, the shield machine 1 A movable hood 29 tilting inward is selected. The movable hood 29 to be tilted is selected according to the posture changing direction of the shield machine 1, and in this embodiment, the movable hoods 29a and 29b on the left side toward the face are selected. Then, the hood jacks 41 of the movable hoods 29 a and 29 b are contracted to tilt the movable hoods 29 a and 29 b inside the shield machine 1.

  Next, as shown in FIG. 7, by extending the slide jack 19, the main shield 15 is propelled from the main body of the shield machine 1, and the face located in front of the main shield 15 is excavated by the cutter head 23. At the same time as the cutter head 23 of the main shield 15 is driven to rotate, the face is positioned in front of the fixed hood 31 and the fixed movable hoods 29c to 29j (that is, the hoods other than the selected movable hoods 29a and 29b) by the copy cutter 21. Excavate the part. The copy cutter 21 that can be moved in and out in conjunction with the rotation of the cutter head 23 is stored in the cutter head 23 so as not to excavate the face portion positioned in front of the tilting movable hoods 29a and 29b, and is fixed to the fixed hood 31. It is made to project from the cutter head 23 so as to excavate the face portion located in front of the movable hoods 29c to 29j. The earth and sand excavated by the cutter head 23 and the copy cutter 21 are sequentially discharged to the rear end side of the shield machine 1 by the discharge device 57.

  Then, as shown in FIG. 8, with the main shield 15 protruding, the shield jack 11 is extended to propel the shield machine 1 body, and the excavated ground is held by the skin plate 9. Prevent loose ground and prevent land subsidence. Since the earth and sand in front of the movable hoods 29a and 29b are not taken into the shield machine 1, they are pressed by the movable hoods 29a and 29b by the propulsion of the shield machine 1 body, and become narrower toward the shield machine 1 side. To be consolidated.

  Here, as shown in FIG. 9, the compacted earth and sand have a function as a wedge, and when the shield machine 1 main body propels, the tilted movable hoods 29 a and 29 b slide along the side face D of the earth and sand. The attitude of the shield machine 1 body is changed to the right side (upper side of the drawing) in the traveling direction.

  As shown in FIG. 10, a series of operations from tilting the movable hoods 29a and 29b to excavating the face with the cutter head 23 and the copy cutter 21 and propelling the shield machine 1 body is defined as one cycle. Is repeated a plurality of times to change the attitude of the main body of the shield machine 1 to the right side in the traveling direction (upper side in the drawing) and construct a tunnel along a desired curve.

  Next, a second example of the posture changing method in the first embodiment will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIGS. 11-14 is a figure which shows the attitude | position change method using the movable hood 29 and the shield jack 11 in the rectangular shield machine 1 which concerns on 1st embodiment of this invention.

  As shown in FIGS. 11 and 12, in order to change the posture to the right in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 1, the movable hoods 29a and 29b are moved in the same manner as in the first embodiment. Select and tilt the movable hoods 29a and 29b inside the shield machine 1 to extend the slide jack 19 to propel the main shield 15, and simultaneously excavate the face located in front of the main shield 15 and copy The face 21 located in front of the fixed hood 31 and the fixed movable hoods 29c to 29j (that is, the hoods other than the selected movable hoods 29a and 29b) is excavated by the cutter 21.

  Then, as shown in FIG. 13, with the main shield 15 protruding, the shield jack 11 installed on the left side of the shield machine 1 is extended to move the left side of the shield machine 1 forward than the right side. The excavated ground is held by the skin plate 9. The earth and sand in front of the tilted movable hoods 29a and 29b are pressed by the movable hoods 29a and 29b by the propulsion of the shield machine 1 main body that has not been taken into the shield machine 1 and become thinner toward the shield machine 1 side. Consolidated.

  Here, as shown in FIG. 14, the compacted earth and sand have a function as a wedge. Like the first embodiment, when the shield machine 1 main body is propelled, the tilted movable hoods 29a and 29b It slides along the side surface D of earth and sand, and changes the posture of the shield machine 1 main body to the right side in the traveling direction (upper side of the paper).

  When the posture is changed using the movable hoods 29a and 29b and the shield jack 11, the posture of the shield machine 1 is changed more than when the posture is changed using only the movable hoods 29a and 29b.

  From tilting the movable hoods 29a and 29b to excavating the face with the cutter head 23 and the copy cutter 21, and operating the shield jack 11 installed on the left side of the shield machine 1 to propel the shield machine 1 body A series of operations is defined as one cycle, and this cycle is repeated a plurality of times, thereby changing the posture of the shield machine 1 main body to the right side in the traveling direction (upper side in the drawing) and constructing a tunnel along a desired curve.

  Furthermore, the 3rd Example of the attitude | position change method in 1st embodiment is shown.

  FIGS. 15-18 is a figure which shows the attitude | position change method using the movable hood 29, the shield jack 11, and the folding jack 55 in the rectangular shield machine 1 which concerns on 1st embodiment of this invention.

  As shown in FIGS. 15 and 16, in order to change the posture to the right in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 1, as in the first and second embodiments, the movable hood 29a is used. , 29b, and the movable hoods 29a, 29b are tilted inside the shield machine 1.

  Next, the bent jack 55 installed on the left side of the shield machine 1 is extended to advance the left side of the girder part 7 more than the right side, and the hood part 3 and the girder part 7 advance relative to the tail part 5. Tilt to the right.

  Then, as in the first and second embodiments, the main shield 15 is propelled by extending the slide jack 19 and the cutting face located in front of the main shield 15 is excavated at the same time by the copy cutter 21. The face portion located in front of the fixed hood 31 and the fixed movable hoods 29c to 29j (that is, the hoods other than the selected movable hoods 29a and 29b) is excavated.

  As shown in FIG. 17, with the main shield 15 protruding, the shield jack 11 installed on the left side of the shield machine 1 is extended to extend the shield machine 1 in the same manner as in the second embodiment. Move the left side forward than the right side.

  Here, as shown in FIG. 18, the compacted earth and sand has a function as a wedge, and, like the first and second embodiments, the movable hood 29a tilted when the shield machine 1 main body is propelled. , 29b slides along the side surface D of the earth and sand, and changes the posture of the shield machine 1 main body to the right side in the traveling direction (upper side in the drawing).

  When changing the posture using the movable hoods 29a and 29b, the shield jack 11 and the bent jack 55, the posture of the shield machine 1 is changed more than when changing the posture using the movable hoods 29a and 29b and the shield jack 11. The

  After tilting the movable hoods 29a and 29b, the folding jack 55 installed on the left side of the shield machine 1 is operated, the face is excavated by the cutter head 23 and the copy cutter 21, and installed on the left side of the shield machine 1. A series of work until the shield machine 1 main body is actuated and the shield machine 1 main body is propelled is defined as one cycle. By repeating this cycle a plurality of times, the position of the shield machine 1 main body is set to the right side (upper side in the drawing). Convert to build a tunnel along the desired curve.

  As described above, in the shield machine 1 according to the present embodiment, the hood portion 3 is divided into a plurality of hoods, and at least a part of the hood is configured as the movable hood 29 that tilts toward the inside of the shield machine 1. By providing the drive mechanism 33 for tilting the hood 29, the movable hood 29 can be tilted toward the inside of the shield machine 1. Further, the shield machine 1 includes the cutter head 23 having the copy cutter 21, so that the fixed hood 31 and the fixed movable hoods 29 c to 29 j are not excavated without excavating the face portion positioned in front of the tilting movable hoods 29 a and 29 b. It becomes possible to excavate the face portion located in front.

  Therefore, the movable hoods 29a and 29b are tilted, and the face portions located in front of the movable hoods 29a and 29b are not excavated, but the face portions located in front of the fixed hood 31 and the movable hoods 29c to 29j to be fixed are excavated. However, when the shield machine 1 is propelled, the sand and sand in the face portion located in front of the movable hoods 29a and 29b is not taken into the shield machine 1, but is consolidated by the propulsion of the shield machine 1 main body and has a function as a wedge. When the shield machine 1 is propelled, the movable hoods 29a and 29b slide along the side surface D of the compacted earth and sand, and the attitude of the shield machine 1 can be changed. That is, even when the shape of the segment 13 is semicircular, U-shaped, etc., and all the shield jacks 11 cannot be used for changing the posture, the posture of the shield machine 1 can be changed.

  In addition, by using the method of changing the posture with the movable hoods 29a and 29b together with the shield jack 11, the bent jack 55, etc., the effect of changing the posture is increased, and the posture can be changed in a short section. It becomes.

  Then, the movable hoods 29a and 29b are tilted to excavate the fixed hood 31 and the face portion positioned in front of the movable hoods 29c to 29j to be fixed. By holding the movable hoods 29c to 29j to be fixed, it is possible to prevent the natural ground from loosening and to prevent ground subsidence.

  Moreover, since the movable hoods 29a and 29b tilt toward the inner side of the shield machine 1, they do not damage the ground.

  Next, an embodiment different from the first embodiment in the present invention will be described. In the following description, the same reference numerals are given to portions corresponding to those using the same technique as in the first embodiment, and description thereof is omitted.

  FIG. 19 is a side sectional view of a rectangular shield machine 61 according to the second embodiment of the present invention, and FIG. 20 is a front view of the rectangular shield machine 61 according to the second embodiment of the present invention. As shown in FIGS. 19 and 20, the shield machine 61 includes a drive mechanism 73 different from the drive mechanism 33 of the hood portion 3 of the shield machine 1 described in the first embodiment. Will be described. The hood part 3 of the shield machine 61 includes a movable hood 69 that is displaced inward of the shield machine 61 and a fixed hood 31 in a state parallel to the central axis of the shield machine 61. And the drive mechanism 73 for driving each movable hood 69 is each installed inside the skin plate 9, and each movable hood 69 can be driven independently. Similar to the first embodiment, the movable hood 69 is provided, for example, at a total of 10 positions in the horizontal and vertical positions with respect to the central axis of each main shield 15.

  FIG. 21 is a view showing a drive mechanism 73 of the movable hood 69 according to the second embodiment of the present invention. The drive mechanism 73 is attached to the end of the movable hood 69 on the girder part 7 side, and slides along the partition wall 63, a girder part side bracket 77 fixed to the end of the guide 75, and the girder part. A hood portion jack 83 that is connected to the side bracket 77 via a pin 79 and a clevis 81 and has a base end portion 83 a fixed to the inside of the girder portion 7, and a hood portion side bracket 85 that is fixed to the inside of the hood portion 3. And a support member 89 having one end connected to the hood portion side bracket 85 via a pin 87 and the other end fixed to the guide 75 via a partition wall 63, and preventing earth and sand from being inserted into the shield machine 1 main body. It is comprised from the sealing materials 38 and 40.

  The movable hood 69 extends from the inner side of the shield machine 61 in a state where the movable hood 69 is parallel to the central axis of the shield machine 61 through a guide 75 that slides along the partition wall 63 by extending the hood jack 83. Move towards. Further, when the hood jack 83 is contracted, the movable hood 69 does not move inward and has the same shape as the fixed hood 31.

  Below, the attitude | position change method of the shield machine 61 is demonstrated according to the attitude | position change procedure.

  22 to 26 are views showing a posture changing method using only the movable hood 69 in the rectangular shield machine 61 according to the second embodiment of the present invention.

  First, the 1st Example of the attitude | position change method in 2nd embodiment is shown.

  As shown in FIG. 22, in order to change the posture to the right side in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 61 according to the present embodiment configured as described above, first, the inner side of the shield machine 61 is directed. The movable hood 69 to be moved is selected. The movable hood 69 to be moved selects the movable hoods 69a and 69b on the left side toward the face as in the first embodiment. Then, the hood section jacks 83 of the movable hoods 69 a and 69 b are respectively extended to move the movable hood 69 to the inside of the shield machine 61.

  Next, as shown in FIG. 23, by extending the slide jack 19, the main shield 15 is propelled from the main body of the shield machine 61, and the face located in front of the main shield 15 is excavated by the cutter head 23. The face portion located in front of the fixed hood 31 and the fixed movable hoods 69c to 69j is excavated by the copy cutter 21. The copy cutter 21 is stored in the cutter head 23 so as not to excavate the face portion located in front of the movable hoods 69a and 69b to be moved, and the fixed hood 31 and the fixed movable hoods 69c to 69j (that is, the selected movable hoods are selected). It protrudes from the cutter head 23 so as to excavate the face portion located in front of the hoods other than 69a and 69b.

  Then, as shown in FIG. 24, with the main shield 15 protruding, the shield jack 11 is extended to propel the shield machine 61 main body. The earth and sand in front of the moved movable hoods 69 a and 69 b are not taken into the shield machine 61 and are consolidated by the movable hoods 69 a and 69 b and the partition wall 63 by the propulsion of the shield machine 61 body.

  Here, as shown in FIG. 25, the earth and sand consolidated by the movable hoods 69a and 69b and the partition wall 63 swell in a direction (E surface in the figure) orthogonal to the pressurizing direction (the propulsion direction of the shield machine 61). A force is generated, and this force acts on the movable hoods 69a and 69b to change the posture of the shield machine 61 main body to the right side in the traveling direction (upper side in the drawing).

  As shown in FIG. 26, a series of operations from moving the movable hoods 69a and 69b to excavating the face with the cutter head 23 and the copy cutter 21 and propelling the shield machine 61 main body is defined as one cycle. Is repeated a plurality of times to change the posture of the shield machine 61 main body to the right side in the traveling direction (upper side in the drawing) and construct a tunnel along a desired curve.

  Next, a second example of the posture changing method in the second embodiment will be described.

  27-30 is a figure which shows the attitude | position change method using the movable hood 69 and the shield jack 11 in the rectangular shield machine 61 which concerns on 2nd embodiment of this invention.

  As shown in FIGS. 27 and 28, in order to change the posture to the right in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 61, as in the first example of the present embodiment, the movable hood 69a is used. 69b, move the movable hoods 69a, 69b to the inside of the shield machine 61, extend the slide jack 19 to propel the main shield 15, and excavate the face located in front of the main shield 15. At the same time, the face portion located in front of the fixed hood 31 and the fixed movable hoods 69c to 69j (that is, the hoods other than the selected movable hoods 69a and 69b) is excavated by the copy cutter 21.

  29, with the main shield 15 protruding, the shield jack 11 installed on the left side of the shield machine 61 is extended to advance the left side of the shield machine 61 more than the right side. The excavated ground is held by the skin plate 9. Since the earth and sand in front of the moved movable hood 69 is not taken into the shield machine 61, it is consolidated by the movable hoods 69 a and 69 b and the partition wall 63 by the propulsion of the shield machine 61 main body.

  Here, as shown in FIG. 30, the earth and sand compacted by the movable hoods 69 a and 69 b and the partition wall 63 are applied in the pressurizing direction (the propulsion direction of the shield machine 61) as in the first example of the present embodiment. ) That swells in a direction (E surface in the figure) perpendicular to the horizontal axis), and this force acts on the movable hoods 69a and 69b, and changes the posture of the shield machine 61 main body to the right side (upper side in the drawing).

  When the posture is changed using the movable hoods 69a and 69b and the shield jack 11, the posture of the shield machine 61 is changed more than when the posture is changed using only the movable hoods 69a and 69b.

  After moving the movable hoods 69a and 69b, the face is excavated by the cutter head 23 and the copy cutter 21, and the shield jack 11 installed on the left side of the shield machine 61 is operated to propel the shield machine 61 main body. A series of work is defined as one cycle, and the cycle of the shield machine 61 is changed to the right side (upper side of the paper) by constructing a tunnel along a desired curve by repeating this cycle a plurality of times.

  Furthermore, the 3rd Example of the attitude | position change method in 2nd embodiment is shown.

  FIGS. 31-34 is a figure which shows the attitude | position changing method using the movable hood 69, the shield jack 11, and the folding jack 55 in the rectangular shield machine 61 which concerns on 2nd embodiment of this invention.

  As shown in FIG. 31 and FIG. 32, in order to change the posture to the right side in the traveling direction (upper side of the paper in FIG. 32) in the tunnel using the shield machine 61, the first and second examples in the present embodiment Similarly, the movable hoods 69a and 69b are selected, and the movable hoods 69a and 69b are moved inside the shield machine 61.

  Next, the folding jack 55 installed on the left side of the shield machine 61 is extended to advance the left side of the girder part 7 more than the right side, and the hood part 3 and the girder part 7 advance relative to the tail part 5. Tilt to the right.

  Then, as in the first and second examples of the present embodiment, the main shield 15 is propelled by extending the slide jack 19 and the face located in front of the main shield 15 is excavated and simultaneously copied. The face 21 located in front of the fixed hood 31 and the fixed movable hoods 69c to 69j (that is, the hoods other than the selected movable hoods 69a and 69b) is excavated by the cutter 21.

  Further, as shown in FIG. 33, with the main shield 15 protruding, the shield jack 11 installed on the left side of the shield machine 61 is extended in the same manner as the second example in the present embodiment. The left side portion of the shield machine 61 is advanced more than the right side portion.

  Here, as shown in FIG. 34, the earth and sand compacted by the movable hoods 69a and 69b and the partition wall 63 are applied in the pressurizing direction (shielding machine 61) as in the first and second examples of the present embodiment. Is generated in a direction orthogonal to the propulsion direction (E surface in the figure), and this force acts on the movable hoods 69a and 69b to change the attitude of the shield machine 61 main body to the right side (upper side in the drawing). .

  When changing the posture using the movable hoods 69a and 69b, the shield jack 11 and the bent jack 55, the posture of the shield machine 61 is changed more than when changing the posture using the movable hoods 69a and 69b and the shield jack 11. The

  After moving the movable hoods 69a and 69b, the folding jack 55 installed on the left side of the shield machine 61 is operated, the face is excavated by the cutter head 23 and the copy cutter 21, and installed on the left side of the shield machine 61. A series of operations from the operation of the shielded shield 11 to propelling the shield machine 61 main body is defined as one cycle, and by repeating this cycle a plurality of times, the attitude of the shield machine 61 main body is set to the right side (upper side in the drawing). Convert to build a tunnel along the desired curve.

  As described above, in the shield machine 61 according to the present embodiment, the hood portion 3 is divided into a plurality of hoods, and at least a part of the hood is parallel to the central axis of the shield machine 61 and is disposed inside the shield machine 61. The movable hood 69 that moves toward the shield machine 61 can be moved by being provided with a drive mechanism 73 for moving the movable hood 69. In addition, the shield machine 61 includes the cutter head 23 having the copy cutter 21 so that the fixed hood 31 and the fixed movable hoods 69c to 69j are not excavated without excavating the face portion located in front of the movable movable hoods 69a and 69b. It becomes possible to excavate the face portion located in front.

  Accordingly, the movable hoods 69a and 69b are moved, and the face portions located in front of the movable hoods 69a and 69b are not excavated, but the face portions located in front of the fixed hood 31 and the movable hoods 69c to 69j to be fixed are excavated. Then, when the shield machine 61 is propelled, the earth and sand at the face portion positioned in front of the movable hoods 69a and 69b is not taken into the shield machine 61 but is consolidated by the propulsion of the shield machine 61 body. The consolidated earth and sand generate a force that swells in a direction (E surface in the figure) orthogonal to the pressurizing direction (the propulsion direction of the shield machine 61), and this force acts on the movable hoods 69a and 69b, and the shield machine 61 main body Can be changed to the right side (upper side of the drawing) in the traveling direction. That is, even when the shape of the segment 13 is semicircular, U-shaped, etc., and all the shield jacks 11 cannot be used for posture change, the posture of the shield machine 61 can be changed.

  In addition, by using the method of changing the posture with the movable hoods 69a and 69b together with the shield jack 11, the bent jack 55, etc., the effect of changing the posture is increased, and the posture can be changed in a short section. It becomes.

  Then, the movable hoods 69a and 69b are driven to excavate the fixed hood 31 and the face portion located in front of the movable hoods 69c to 69j to be fixed, and the shield machine 61 is propelled to move the excavated ground into the fixed hood 31 and By holding the movable hoods 69c to 69j to be fixed, it is possible to prevent the natural ground from loosening and to prevent ground subsidence.

  Moreover, since the movable hoods 69a and 69b move toward the inside of the shield machine 61, they do not damage the natural ground.

  Next, a third embodiment of the present invention will be described. In the present embodiment, a method of using a typical circular shield machine that propels the shield machine main body simultaneously with excavation will be described.

  FIG. 35 is a front view of the circular shield machine 2 according to the third embodiment of the present invention, and FIG. 36 is a side sectional view of the circular shield machine 2 according to the third embodiment of the present invention. Since the basic configuration of the shield machine 2 according to this embodiment is the same as that of the first and second embodiments, differences will be mainly described. As shown in FIGS. 35 and 36, the shield machine 2 includes a cylindrical steel shell skin plate 90 and a single cutter head 91 having a copy cutter 21. The hood section 3 includes an arc-shaped movable hood 92 that tilts toward the inside of the shield machine 2 and an arc-shaped fixed hood 94. The movable hood 92 is circular with respect to the central axis of the shield machine 2 body. For example, a total of eight locations are provided in the circumferential direction. Further, the hood unit 3 has a drive mechanism 33 for tilting each movable hood 92.

  Below, the attitude | position change method of the shield machine 2 is demonstrated according to the attitude | position change procedure.

  First, the 1st Example of the attitude | position change method in 3rd embodiment is shown.

  FIG. 37 is a diagram showing a posture changing method using only the movable hood 92 in the circular shield machine 2 according to the third embodiment of the present invention.

  As shown in FIG. 37, in order to change the posture to the right side in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 2 according to the present embodiment configured as described above, first, inward of the shield machine 2. The movable hood 92 that tilts is selected. The movable hood 92 that tilts is selected according to the posture change direction of the shield machine 2, and in the present embodiment, the movable hoods 92a to 92d (shown in FIG. 35) on the left side toward the face are selected. Then, the hood jacks 41 of the movable hoods 92 a to 92 d are respectively contracted to tilt the movable hoods 92 a to 92 d inside the shield machine 2.

  Next, the shield machine 2 main body is propelled by extending the shield jack 11, and the face located at the front is excavated by the cutter head 91. At the same time as the cutter head 91 is rotationally driven, the copy cutter 21 excavates the face portion located in front of the fixed hood 94 and the fixed movable hoods 92e to 92h (that is, the hoods other than the selected movable hoods 92a to 92d). . The copy cutter 21 which can be freely moved in conjunction with the rotation of the cutter head 91 is stored in the cutter head 91 so as not to excavate the face portion located in front of the tilting movable hoods 92a to 92d, and is fixed to the fixed hood 94. It is made to protrude from the cutter head 91 so that the face part located in front of the movable hoods 92e-92h may be excavated.

  Since the earth and sand in front of the movable hoods 92a to 92d are not taken into the shield machine 2 even if the shield machine 2 main body is propelled as in the first embodiment, the movable hoods 92a to 92d are driven by the propulsion of the shield machine 2 main body. The compacted sand and sand has a function as a wedge. When the shield machine 2 main body propels, the tilted movable hoods 92a to 92d slide along the side face D of the sand and sand, and the shield machine. 2 Change the posture of the main body to the right side (upper side of the page) in the direction of travel.

  A series of operations from tilting the movable hoods 92a to 92d to excavating the face with the cutter head 91 and the copy cutter 21 and propelling the shield machine 2 main body is defined as one cycle. By repeating this cycle a plurality of times, The tunnel body along the desired curve is constructed by changing the attitude of the main body of the shield machine 2 to the right side (upper side of the drawing) in the traveling direction.

  Next, a second example of the posture changing method in the third embodiment will be described.

  FIG. 38 is a view showing a posture changing method using the movable hood 92 and the shield jack 11 in the circular shield machine 2 according to the third embodiment of the present invention.

  As shown in FIG. 38, in order to change the posture to the right in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 2, the movable hoods 92a to 92d are similar to the first example in the present embodiment. (Shown in FIG. 35) is selected, and the movable hoods 92 a to 92 d are tilted inside the shield machine 2.

  Next, the shield jack 11 installed on the left side of the shield machine 2 is extended and the left side of the shield machine 2 is advanced from the right side to propel the shield machine 2 body, and the face located at the front is cut by a cutter. At the same time as excavating by the head 91, the copy cutter 21 excavates the fixed hood 94 and the face portion located in front of the fixed movable hoods 92e to 92h.

  As in the first embodiment, the earth and sand in front of the movable hoods 92a to 92d are consolidated by the movable hoods 92a to 92d by the propulsion of the shield machine 2 body, and the consolidated earth and sand have a function as a wedge. When the shield machine 2 main body is propelled, the tilted movable hoods 92a to 92d slide along the side surface D of the earth and sand, and the posture of the shield machine 2 main body is changed to the right side in the traveling direction (upper side in the drawing).

  When the posture is changed using the movable hoods 92a to 92d and the shield jack 11, the posture of the shield machine 2 is changed more than when the posture is changed using only the movable hoods 92a to 92d.

  From tilting the movable hoods 92a to 92d, excavating the face with the cutter head 91 and the copy cutter 21, and operating the shield jack 11 installed on the left side of the shield machine 2 to propel the shield machine 2 body A series of operations is defined as one cycle, and this cycle is repeated a plurality of times to change the posture of the shield machine 2 main body to the right side in the traveling direction (upper side in the drawing) and construct a tunnel along a desired curve.

  Furthermore, the 3rd Example of the attitude | position change method in 3rd embodiment is shown.

  FIG. 39 is a view showing a posture changing method using the movable hood 92, the shield jack 11 and the folding jack 55 in the circular shield machine 2 according to the third embodiment of the present invention.

  As shown in FIG. 39, in order to change the posture to the right in the traveling direction (upper side in the drawing) in the tunnel using the shield machine 2, as in the first and second examples of the present embodiment, the movable hood 92 a to 92 d (shown in FIG. 35) are selected, and the movable hoods 92 a to 92 d are tilted inside the shield machine 2.

  Next, the bent jack 55 installed on the left side of the shield machine 2 is extended to advance the left side of the girder part 7 more than the right side, and the hood part 3 and the girder part 7 advance relative to the tail part 5. Tilt to the right.

  And like the said 2nd Example in this embodiment, the shield jack 11 installed in the left side part of the shield machine 2 is extended, and the left side part of the shield machine 2 is advanced rather than the right side part, and the shield machine 2 The main body is propelled, and the face located in front is excavated by the cutter head 91. Further, the face portion located in front of the fixed hood 94 and the fixed movable hoods 92e to 92h is excavated by the copy cutter 21.

  As in the first embodiment, the earth and sand in front of the movable hoods 92a to 92d are consolidated by the movable hoods 92a to 92d by the propulsion of the shield machine 2 body, and the consolidated earth and sand have a function as a wedge. When the shield machine 2 main body is propelled, the tilted movable hoods 92a to 92d slide along the side surface D of the earth and sand, and the posture of the shield machine 2 main body is changed to the right side in the traveling direction (upper side in the drawing).

  When the posture is changed using the movable hoods 92a to 92d, the shield jack 11 and the bent jack 55, the posture of the shield machine 2 is changed more than when the posture is changed using the movable hoods 92a to 92d and the shield jack 11. The

  After tilting the movable hoods 92a to 92d, the folding jack 55 installed on the left side of the shield machine 2 is operated, the face is excavated by the cutter head 91 and the copy cutter 21, and installed on the left side of the shield machine 2. A series of work until the shielded machine 11 is operated and the shield machine 2 main body is propelled is defined as one cycle, and the cycle of the shield machine 2 main body is set to the right side (upper side in the drawing) by repeating this cycle a plurality of times. Convert to build a tunnel along the desired curve.

  In the present embodiment, the method of using the drive mechanism 33 as a method of driving the movable hood 92 has been described. However, the present invention is not limited to this, and the drive device 73 may be used.

  In each of the above-described embodiments, the posture changing method using the rectangular or circular shield machines 1, 2, and 61 has been described. However, the shape of the shield machine is not limited to the rectangular or circular shape, and various cross sections. For example, as shown in FIG. 40, the attitude changing method of the present invention can also be applied to a double circular shield machine.

  Further, in all the embodiments described above, the method of changing the attitude of the shield machines 1, 2, 61 to the right side in the traveling direction has been described. However, the present invention is not limited to this. It is possible to change the posture during trajectory correction in yawing and rolling.

It is a front view of the rectangular shield machine concerning a first embodiment of the present invention. It is a sectional side view of the rectangular shield machine concerning a first embodiment of the present invention. It is a figure which shows the drive mechanism of the movable hood which concerns on 1st embodiment of this invention. It is sectional drawing of the cutter head which concerns on 1st embodiment of this invention. It is sectional drawing of the girder part and tail part which concern on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 1st embodiment of this invention. It is a sectional side view of the rectangular shield machine concerning a second embodiment of the present invention. It is a front view of the rectangular shield machine concerning a second embodiment of the present invention. It is a figure which shows the drive mechanism of the movable hood which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using only a movable hood in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the rectangular shield machine which concerns on 2nd embodiment of this invention. It is a front view of the circular shield machine concerning a third embodiment of the present invention. It is a sectional side view of the circular shield machine concerning a third embodiment of the present invention. It is a figure which shows the attitude | position change method using only a movable hood in the circular shield machine which concerns on 3rd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood and a shield jack in the circular shield machine which concerns on 3rd embodiment of this invention. It is a figure which shows the attitude | position change method using a movable hood, a shield jack, and a folding jack in the circular shield machine which concerns on 3rd embodiment of this invention. It is a front view of the double circle shield machine concerning the present invention.

Explanation of symbols

1, 2, 61 Shield machine 3 Hood part 5 Tail part 7 Girder part 9, 90 Skin plate 11 Shield jack 13 Segment 15 Main shield 17 Shield body 19 Slide jack 21 Copy cutter 23, 91 Cutter head 25 Drive source 27 Power transmission mechanism 29, 69, 92 Movable hood 31, 94 Fixed hood 33, 73 Drive mechanism 35, 77 Girder part side bracket 37, 45, 79, 87 Pins 38, 39, 40 Seal member 41, 83 Hood part jack 41a Rod 41b Fixed Material 47, 85 Hood part side bracket 49 Support pin 51, 89 Support member 55 Folding jack 57 Discharge device 59 Segment assembly device 63 Bulkhead 75 Guide 81 Clevis

Claims (5)

A shield machine having a hood part at the front in the traveling direction,
The hood part is divided into a plurality of hoods, and at least a part of the hood is configured as a movable hood that can be driven toward the inside of the shield machine,
A drive mechanism for driving the movable hood;
A shield machine comprising: a cutter head having a copy cutter capable of selecting and excavating a part of a face portion positioned in front of the hood portion.   The shield machine according to claim 1, wherein a front portion of the movable hood tilts inward of the shield machine.   The shield machine according to claim 1, wherein the movable hood is displaceable toward the inside of the shield machine in a state parallel to the central axis of the shield machine. In the attitude change method of the shield machine in which the hood portion provided at the front part in the traveling direction is divided into a plurality of hoods, and at least a part of the hood is configured as a movable hood that can be driven toward the inside of the shield machine.
A selection step of selecting a movable hood to be driven for posture change among the movable hoods;
A driving step of driving the selected movable hood toward the inside of the shield machine;
Excavating a natural ground with the cutter head, and simultaneously excavating only the face portion located in front of the hood other than the selected movable hood and leaving the face portion located in front of the selected movable hood, Prepared,
The shield machine is configured to move the shield machine forward, take the excavated ground into the shield machine, and change the posture by compacting the uncut portion of the face portion with the driven movable hood. How to change posture.   The method for changing the attitude of a shield machine according to claim 4, wherein the driving step and the excavation step are performed in this order or in reverse order.

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