JP3882813B2 - Shield jack shoe brace and jack rod rotation prevention device - Google Patents

Description

  The present invention relates to a shield jack shoe swing and a jack rod rotation prevention device which is provided at the tip of a rod of a shield jack and presses the front end surface of an existing segment.

  The shield machine gains propulsion by pressing an existing segment with a shield jack. A shield jack shoe for pressing the front end surface of the existing segment is provided at the rod tip of the shield jack.

  By the way, when excavating a sharply curved tunnel with a shield machine, a small-diameter segment may be assembled in consideration of the movement trajectory of the skin plate at the rear end of the shield machine. In addition, the tunnel may have a small diameter on the way to avoid underground obstacles.

  In this case, since the segment is positioned on the radially inner side of the shield machine, misalignment occurs between the shield jack shoe and the segment. For this reason, the shield jack shoe is moved away from the inner peripheral surface of the skin plate to match the position of the segment.

  When the shield jack shoe is separated from the inner peripheral surface of the skin plate in this manner, the shield jack shoe 51 rotates around the rod 53 of the shield jack 52 due to its weight, as shown in FIG. For this reason, one end of the shield jack shoe 51 enters the inside of the shield machine 54 and interferes with a segment or other component before assembly, or the other end contacts the inner peripheral surface 56 of the skin plate 55. The skin plate 55 may be damaged by contact.

  Therefore, a plurality of anti-rotation mechanisms for restricting the rotation of the shield jack shoe 51 have been proposed conventionally.

  For example, in the rotation prevention mechanism 57 shown in FIG. 10, a rod-like member 59 parallel to the shield jack 52 is provided on a flange 58 that supports the shield jack 52 so as to be slidable in the longitudinal direction, and the rod-like member 59 is shielded. It is connected to the rod 53 of the jack 52. According to the above configuration, since the rotation of the rod 53 is restricted by the rod-like member 59, the rotation of the shield jack shoe 51 supported by the rod 53 is also restricted (see, for example, Patent Document 1).

  The rotation prevention mechanism 61 shown in FIG. 11 is provided with a protruding engagement member 62 extending in the shield radial direction on the inner peripheral surface 56 of the shield jack shoe 51 or the skin plate 55, and the inner peripheral surface of the skin plate 55 facing this. 56 or the shield jack shoe 51 is formed with an engaging groove 63 to which the engaging member 62 is engaged. According to the said structure, since the engaging member 62 engages with the engaging groove 63, it can prevent directly that the shield jack shoe 51 moves to the circumferential direction (for example, refer patent document 2).

  The rotation prevention mechanism 64 shown in FIG. 12 is provided with pressure rods 65 urged toward the inner peripheral surface 56 side of the skin plate 55 by springs (not shown) on both sides of the shield jack shoe 51 in the shield circumferential direction. ing. According to the above configuration, the pressing rods 65 on both sides of the shield jack shoe 51 are fixed by pressing the inner peripheral surface 56 of the skin plate 55, and the rotation of the shield jack shoe 51 can be regulated (for example, Patent Documents). 3).

Japanese Utility Model Publication No. 63-126696 Japanese Utility Model Publication No. 58-153297 Japanese Utility Model Publication No. 3-42892

  However, in the rotation preventing mechanism 57 shown in FIG. 10, the rod-shaped member 59 needs to have a length corresponding to the stroke of the shield jack 52, so that a large installation space is required, which causes a problem in layout. Further, since the rod-shaped member 59 is provided on the skin plate 55 side of the shield jack 52 and the shield jack 52 must be provided away from the skin plate 55, the eccentric amount between the shield jack 52 and the shield jack shoe 51 is large. Thus, there is a problem that the shield jack 52 is enlarged.

  Since the rotation prevention mechanism 61 shown in FIG. 11 is provided with the engagement member 62 and the engagement groove 63 on the shield jack shoe 51 and the skin plate 55, respectively, the rotation is prevented when the shield jack shoe 51 is separated from the skin plate 55. There was a problem that the prevention function could not be performed. Furthermore, it is not preferable in terms of strength to form the engaging groove 63 in the skin plate 55 which is a structural member.

  Since the rotation prevention mechanism 64 shown in FIG. 12 presses the skin plate 55 with the pressing rod 65 provided on the shield jack shoe 51, when the shield jack shoe 51 is separated from the skin plate 55 by the moving stroke of the pressing rod 65 or more, There was a problem that the rotation prevention function could not be performed.

  Accordingly, the present invention has been made to solve the above-described problems, and its purpose is to provide a shield jack shoe that is small in size, requires a small installation space, and can regulate its rotation even when the shield jack shoe is separated from the skin plate. An object of the present invention is to provide a device for preventing rotation of a jack rod and a jack rod.

In order to achieve the above object, the present invention provides a shield having an eccentric member for supporting a shield jack shoe that presses the front end surface of an existing segment eccentrically with respect to the rod at the tip of a rod of the shield jack. In the apparatus for preventing the rotation of the jack shoe and preventing the rotation of the jack rod, the rod or the eccentric member is extended from the rod or the eccentric member to the inner peripheral surface of the skin plate and is brought into contact with the inner peripheral surface of the skin plate for friction. A rotation restricting means for restricting the rotation of the shield jack shoe and the rod, and the eccentric member is provided on the rear end face of the eccentric bracket and the eccentric bracket for eccentrically shifting the shield jack shoe from the shield jack. And an eccentric rotating plate for changing the amount of eccentricity of the shield jack shoe. The rotation restricting means rotates the eccentric rotating plate so that a base end portion is attached to the eccentric rotating plate in advance and the shield jack shoe is separated inward in the shield radial direction with respect to the inner peripheral surface of the skin plate. The other end is configured to come into contact with the inner peripheral surface of the skin plate .
Further, the present invention provides a shield jack shoe having an eccentric member for eccentrically supporting the shield jack shoe for pressing the front end surface of the existing segment at the tip end portion of the rod of the shield jack with respect to the rod. In the jack rod rotation preventing apparatus, the shield jack shoe and the eccentric member are extended from the rod or the eccentric member to the inner peripheral surface of the skin plate and brought into contact with and friction with the inner peripheral surface of the skin plate. A rotation restricting means for restricting the rotation of the rod is provided, and the eccentric member is attached to an eccentric fitting that eccentrically moves the shield jack shoe from the shield jack, and a rear end face of the eccentric fitting is changed to change the attachment position. An eccentric plate for changing the amount of eccentricity of the shield jack shoe. When the eccentric plate is attached to the eccentric fitting so that the jackjack shoe is separated from the inner peripheral surface of the skin plate in the shield radial direction, the rotation restricting means is attached to the eccentric fitting at the base end. And the other end is in contact with the inner peripheral surface of the skin plate.
Further, the present invention provides a shield jack shoe having an eccentric member for eccentrically supporting the shield jack shoe for pressing the front end surface of the existing segment at the tip end portion of the rod of the shield jack with respect to the rod. In the jack rod rotation preventing apparatus, the shield jack shoe and the eccentric member are extended from the rod or the eccentric member to the inner peripheral surface of the skin plate and brought into contact with and friction with the inner peripheral surface of the skin plate. A rotation restricting means for restricting the rotation of the rod is provided, and the eccentric member is provided with an eccentric fitting that eccentrically moves the shield jack shoe from the shield jack, and the eccentric jack member is eccentrically provided by rotating at the tip of the eccentric fitting An eccentric rotating plate for changing the amount, and the rotation restricting means is a base end There are pre-attached to the side of the eccentric bracket, in which the other end is configured to abut always the skin plate inner peripheral surface.

And what was comprised so that the other end part of the said rotation control means may contact | abut at least two places or more in the circumferential direction of the said skin plate is preferable.

  Further, it is preferable that the contact portion of the other end portion of the rotation restricting means with the skin plate is formed of a resin material that is softer than the inner peripheral surface of the skin plate.

  According to the present invention, it is excellent in that it is small in size and has a small installation space, and that its rotation can be restricted even when the shield jack shoe is separated from the skin plate.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a side view and a rear view showing a preferred embodiment of a shield jack shoe swing prevention and jack rod rotation preventing device according to the present invention, and FIG. 2 is a diagram showing a position of the shield jack shoe on the skin plate side. FIG. 3 is a cross-sectional view of the shield machine when the arranged shield jack shoes are viewed from the rear side.

  As shown in FIG. 3, a plurality of shield jacks 1 are arranged in an annular shape inside the skin plate 2 at a predetermined interval in the circumferential direction. In the present embodiment, the shield jack 1 is disposed radially inward of the shield machine 3.

  As shown in FIGS. 1 and 2, a shield jack shoe 5 that presses the front end face of an existing segment (not shown) is provided with an eccentric member 6 at the tip of the rod 4 of the shield jack 1 according to the present embodiment. Is provided.

  The eccentric member 6 includes an eccentric fitting 7 that extends from the tip of the rod 4 to the outside in the shield radial direction, and an eccentric rotating plate 8 provided on the rear end surface 7 b of the eccentric fitting 7.

  The eccentric fitting 7 decenters the shield jack shoe 5 outward in the shield radial direction. The eccentric fitting 7 is formed in a cylindrical shape having a thickness in the shield digging direction, the rod 4 is connected to the front end surface 7a thereof, and the eccentric rotating plate 8 is fixed to the rear end surface 7b via bolts 9. .

  The eccentric rotary plate 8 is formed in a disc shape, and an engagement pin 11 that extends rearward and engages with the shield jack shoe 5 is formed at a position that is eccentric from the center of the rear end surface 8b. A plurality of bolt holes 12 are formed in the eccentric rotating plate 8 at predetermined intervals in the circumferential direction. The bolt holes 12 are formed symmetrically so that the eccentric rotating plate 8 can be fixed to the eccentric fitting 7 in a state where the eccentric rotating plate 8 is turned upside down (rotated 180 degrees). The eccentric rotating plate 8 changes and adjusts the eccentric amount of the shield jack shoe 5 by rotating.

  The shield jack shoe 5 includes a cylindrical body portion 15 in which an engagement hole 14 into which the engagement pin 11 is inserted is formed, and a pressing portion (see FIG. 3) 16 extending from the body portion 15 to both sides. ing. The pressing part 16 contacts the front end surface of the existing segment. Bolt holes 17 and 18 extending in the shield radial direction are formed coaxially in the body portion 15 and the engagement pin 11, and by inserting bolts (not shown) into these bolt holes 17 and 18, a shield jack is provided. The shoe 5 is fixed to the eccentric rotating plate 8.

  On the side opposite to the side on which the engagement pin 11 is provided on the rear end surface 8b of the eccentric rotating plate 8 (the lower portion in FIG. 1), the eccentric rotating plate 8 leads to the inner peripheral surface 19 of the skin plate 2. Rotation restricting means 21 is provided for restricting rotation of the shield jack shoe 5 and the rod 4 of the shield jack 1 by extending and extending in contact with the inner peripheral surface 19 of the skin plate 2 and causing friction.

  In the rotation restricting means 21, the base end portion 22 is fixed to the eccentric rotating plate 8, and the other end portion 23 extends to the inner peripheral surface 19 side of the skin plate 2, so that at least two locations in the shield circumferential direction of the skin plate 2. It is comprised so that it may contact | abut.

  Specifically, the rotation restricting means 21 includes a base portion 24 including a base end portion 22 and a pair of leg portions 25 provided at both ends of the base portion 24 in the shield circumferential direction.

  The base portion 24 is formed of a metal such as steel, has a width substantially equal to the diameter of the eccentric rotating plate 8, and leg portions 25 are attached to both ends thereof. The side located on the shield jack shoe 5 side of the base portion 24 is formed in an arc shape in accordance with the outer peripheral shape of the trunk portion 15 of the shield jack shoe 5. A pair of bolt holes 26 are formed in the base portion 24 at positions corresponding to the bolt holes 12 on the side opposite to the side where the engaging pins 11 of the eccentric rotating plate 8 are provided. The rotation restricting means 21 is fixed to the eccentric rotating plate 8 by inserting and tightening bolts 27 through 26 and 12.

  The leg portion 25 is arranged in a bifurcated shape, and the tip thereof is in contact with the inner peripheral surface 19 of the skin plate 2. A contact portion 28 made of a resin material softer than the inner peripheral surface 19 of the skin plate 2 is formed at the tip of the leg portion 25 (the other end portion 23 of the rotation restricting means 21). The resin material constituting the contact portion 28 has a frictional force with which the leg portion 25 does not move in the circumferential direction with respect to the inner peripheral surface 19 of the skin plate 2.

  The rotation restricting means 21 is attached in advance to the eccentric rotating plate 8 that is the eccentric member 6, and when the shield jack shoe 5 is separated from the skin plate 2 and arranged on the inner side in the shield radial direction (position where the eccentricity is small), It is located on the skin plate 2 side and is configured to contact the inner peripheral surface 19.

  That is, as shown in FIG. 2, when the shield jack shoe 5 is on the skin plate 2 side on the outer side in the shield radial direction (position of large eccentricity), the rotation restricting means 21 is retracted on the inner side in the shield radial direction. . At this time, since the shield jack shoe 5 is close to the inner peripheral surface 19 of the skin plate 2, it does not rotate.

  From this state, as shown in FIG. 1, in order to move the shield jack shoe 5 to the inside in the shield radial direction (the position where the eccentricity is small), first, the shield jack 1 of the part to be operated is retracted by a predetermined distance, A space created by this degeneration is used as a work space. Then, while fixing the shield jack shoe 5, the bolts fixing the body portion 15 and the engagement pin 11 are removed, and the shield jack shoe 5 is removed. Thereafter, the bolt 9 is pulled out from the rear portion of the eccentric rotating plate 8, and the eccentric rotating plate 8 is once removed from the eccentric fitting 7. Then, the eccentric rotating plate 8 is rotated 180 degrees and fixed to the eccentric fitting 7 by the bolt 9 again. Thereafter, the shield jack shoe 5 is attached to the eccentric rotating plate 8. This operation is sequentially performed for each shield jack shoe 5 provided in the shield circumferential direction.

  According to the above configuration, the rotation restricting means 21 previously attached to the eccentric rotating plate 8 is disposed at a position in contact with the inner peripheral surface 19 of the skin plate 2 at the same time that the shield jack shoe 5 is eccentrically moved. The Thereby, even if the shield jack shoe 5 is separated from the skin plate 2, the rotation restricting means 21 is in contact with the inner peripheral surface 19 of the skin plate 2. Therefore, even if the shield jack shoe 5 tries to rotate around the rod 4 of the shield jack 1, the leg portion 25 cannot be moved simply by being pressed against the skin plate 2, so that the eccentric bracket 7, the shield jack shoe 5 and the rod 4 can be moved. Rotation is reliably regulated.

  As a result, as shown in FIG. 3, the shield jack shoe 5 does not rotate and can hold the optimum position with respect to the existing segment. Also, one end of the shield jack shoe 5 enters the inside of the shield machine 3 and interferes with the segments and other components before assembly, or the other end abuts against the inner peripheral surface 19 of the skin plate 2. The skin plate 2 is not damaged.

  Furthermore, since the rotation restricting means 21 having the above configuration is provided on the eccentric rotating plate 8 close to the skin plate 2, the rotation restricting means 21 can be reduced in size and can be mounted even in a small installation space. Therefore, it is not necessary to separate the shield jack 1 from the skin plate 2 more than necessary, and the amount of eccentricity between the shield jack 1 and the shield jack shoe 5 can be suppressed, so that an increase in the size of the shield jack 1 can be prevented.

  Further, since the rotation restricting means 21 is attached in advance to a predetermined position of the eccentric rotating plate 8, the rotation restricting means 21 is disposed at a position where it abuts against the inner peripheral surface 19 of the skin plate 2 simply by rotating the eccentric rotating plate 8. Can be made.

  According to the above configuration, when the shield jack 1 is expanded and contracted, the leg portion 25 of the rotation restricting means 21 slides in the shield axial direction with respect to the skin plate 2. Since the contact portion 28 is formed of a soft resin material, the inner peripheral surface 19 of the skin plate 2 is not damaged.

  FIG. 4 is a side view and a rear view showing a second preferred embodiment of the shield jack shoe swing prevention and jack rod rotation preventing device according to the present invention, and FIG. 5 is a diagram showing the position of the shield jack shoe on the skin plate side. It is the side view and rear view which showed the state at the time of doing.

  The shield jack shoe brace and jack rod rotation prevention device according to the present embodiment has a rotation restricting means 21 attached to the rear end face of the eccentric fitting 7.

  In the present embodiment, an eccentric plate 31 corresponding to the eccentric rotating plate 8 of FIG. 1 is attached to the eccentric fitting 7. The eccentric plate 31 is made of a metal such as steel and has a substantially rectangular shape.

  The eccentric fitting 7 has a larger number of bolt holes 33 than the bolt holes 32 formed in the eccentric plate 31. A large number of bolt holes 33 are arranged at a predetermined pitch in the shield radial direction, and the amount of eccentricity of the shield jack shoe 5 with respect to the shield jack 1 is changed by changing the mounting position of the eccentric plate 31 to the eccentric bracket 7. It has become.

  The rotation restricting means 21 is fixed to the rear end face of the eccentric fitting 7 when the eccentric plate 31 is moved inward in the shield radial direction (position where the amount of eccentricity is small). Specifically, since the bolt hole 33 located closest to the skin plate 2 of the eccentric fitting 7 is vacant when the eccentric plate 31 is moved, the rotation restricting means 21 is fixed using the bolt hole 33. That is, when the shield jack shoe 5 is positioned outside the shield radial direction, the rotation restricting means 21 is not attached, and when the shield jack shoe 5 is moved inside the shield radial direction, the rotation restricting means 21 becomes the eccentric fitting. 7 is attached.

  The rotation restricting means 21 has a base portion 24 and a leg portion 25 in the same manner as described above. The side located on the shield jack shoe 5 side of the base portion 24 is formed in a straight line according to the outer peripheral shape of the eccentric plate 31.

  In addition, about another structure, since it is the same as that of the anti-rotation and jack rod rotation prevention apparatus of 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Also in the present embodiment, the rotation of the shield jack shoe 5 can be restricted even if the shield jack shoe 5 is separated from the skin plate 2, as in the case of the anti-rotation and jack rod rotation prevention device of the first embodiment. Since the size of the restricting means 21 is reduced and the amount of eccentricity of the shield jack shoe 5 can be suppressed, it is possible to obtain an effect that the enlargement of the shield jack 1 can be prevented.

FIG. 6 is a side view and a rear view showing a reference embodiment which is not an embodiment according to the present invention.

Anti-rotation device of Futome and jack rod shield jacks shoe according to this reference embodiment, the rotation regulating means 21 is provided directly to the rod 4.

  The rotation restricting means 21 is composed of a base portion 34 formed longer in the shield radial direction than the base portion 24 of FIG. 1 and a leg portion 25 provided at the tip thereof. A bolt hole 39 extending in the shield radial direction is formed in the base end portion 35 of the base portion 34, and a bolt hole 40 extending in the shield radial direction is formed in the rod 4. The rotation restricting means 21 is fixed to the rod 4 by inserting and tightening the bolts 36 into these bolt holes 40 and 39.

  According to the above configuration, regardless of the eccentric position (eccentricity) of the shield jack shoe 5, the rotation restricting means 21 is in contact with the inner peripheral surface 19 of the skin plate 2, and always restricts the rotation of the shield jack shoe 5. The same operational effects as those of the first and second embodiments described above can be obtained.

  The method of fixing the rod 4 and the rotation restricting means 21 is not limited to the above-described configuration. For example, as shown in FIG. 7, a pair of semicircles that are fixed by bolts 37 surrounding the outer peripheral surface of the rod 4. The band member 38 may be attached to the base end portion 35 of the base portion 34.

In the above reference embodiment, the rotation restricting means 21 is provided with the bifurcated leg portions 25 on the base portions 24 and 34 and is in contact with the skin plate 2 at two locations. is not. If the contact portion 28 of the leg portion 25 with the skin plate 2 has a predetermined length or more in the circumferential direction of the shield, even if the rotation restricting means 21 and the skin plate 2 are in contact with only one place. Good. Of course, the number of contact points between the rotation restricting means 21 and the skin plate 2 may be three or more.

FIGS. 8A and 8B are a side view and a rear view showing a third preferred embodiment of the apparatus for preventing the shield jack shoe and preventing the rotation of the jack rod according to the present invention.

  In the shield jack shoe brace and jack rod rotation prevention device according to the present embodiment, rotation restricting means 21 are attached to both side surfaces of the eccentric fitting 7.

  A cutout portion 43 having a flat portion 41 along the shield radial direction for attaching the rotation restricting member 21 is formed on the side surface of the eccentric fitting 7. A plate 44 (rotation restricting member 21) disposed along the flat surface portion 41 and extending to the inner peripheral surface 19 of the skin plate 2 is attached to the notch portion 43 via a bolt 45. The notch 43 and the plate 44 are formed on both side surfaces of the eccentric fitting 7.

  Other configurations are the same as those of the shield jack shoe bracing and jack rod rotation prevention device of the first embodiment, and thus the same reference numerals are given and description thereof is omitted.

  According to the above configuration, regardless of the eccentric position of the shield jack shoe 5, the rotation restricting means 21 is in contact with the inner peripheral surface 19 of the skin plate 2, and the rotation of the shield jack shoe 5 and the rod 4 is always restricted. And the same effects as those of the above-described embodiment can be obtained.

FIG. 2A is a side view and FIG. 2B is a rear view showing a preferred first embodiment of a shield jack shoe swing and jack rod rotation prevention device according to the present invention. (A) which showed the state at the time of non-eccentricity of a shield jack shoe is a side view, (b) is a rear view. It is sectional drawing of the shield machine which looked at the arranged shield jack shoe from back. (A) is a side view and (b) is a rear view showing a second preferred embodiment of the shield jack shoe swing and jack rod rotation preventing device according to the present invention. (A) which showed the state at the time of non-eccentricity of a shield jack shoe is a side view, (b) is a rear view. Showed reference in the form of anti-rotation device of Futome and jack rod of shielded jack shoe (a) is a side view, (b) is a rear view. It is the rear view which showed the fixed state of a rod and a rotation control means. (A) is a side view, (b) is a rear view showing a preferred third embodiment of the shield jack shoe swing and jack rod rotation prevention device according to the present invention. It is sectional drawing of the shield machine which looked at the conventional shield jack shoes arranged. It is sectional drawing which showed the rotation prevention mechanism of the conventional shield jack shoe. It is sectional drawing which showed the rotation prevention mechanism of the conventional shield jack shoe. It is sectional drawing which showed the rotation prevention mechanism of the conventional shield jack shoe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield jack 2 Skin plate 4 Rod 5 Shield jack shoe 6 Eccentric member 7 Eccentric bracket 8 Eccentric rotating plate 19 Inner peripheral surface (of skin plate) 21 Rotation restricting means 22 (of rotation restricting means) Base end 23 (Rotation restricting means) Other end 28 Contact part 31 Eccentric plate

Claims (5)

A shield jack shoe having an eccentric member for supporting the shield jack shoe pressing the front end face of the existing segment at the tip of the rod of the shield jack eccentrically with respect to the rod, and an anti-rotation device for the jack rod The rod or the eccentric member extends from the rod or the eccentric member to the inner peripheral surface of the skin plate and abuts against the inner peripheral surface of the skin plate to cause friction to restrict the rotation of the shield jack shoe and the rod. Provide rotation regulation means ,
The eccentric member includes an eccentric fitting that eccentrically places the shield jack shoe from the shield jack, and an eccentric rotating plate that is provided on the rear end surface of the eccentric fitting and rotates to change the amount of eccentricity of the shield jack shoe. The rotation restricting means rotates the eccentric rotating plate so that a base end portion is attached to the eccentric rotating plate in advance and the shield jack shoe is separated inward in the shield radial direction with respect to the inner peripheral surface of the skin plate. An apparatus for preventing the rotation of a jack jack shoe and preventing the rotation of the jack rod, characterized in that the other end portion is brought into contact with the inner peripheral surface of the skin plate when being pressed . A shield jack shoe having an eccentric member for supporting the shield jack shoe pressing the front end face of the existing segment at the tip of the rod of the shield jack eccentrically with respect to the rod, and an anti-rotation device for the jack rod The rod or the eccentric member extends from the rod or the eccentric member to the inner peripheral surface of the skin plate and abuts against the inner peripheral surface of the skin plate to cause friction to restrict the rotation of the shield jack shoe and the rod. Provide rotation regulation means,
The eccentric member is an eccentric bracket that eccentrically moves the shield jack shoe from the shield jack, and an eccentric plate that is attached to the rear end surface of the eccentric bracket and changes the amount of eccentricity of the shield jack shoe by changing the mounting position thereof. When the eccentric plate is attached to the eccentric fitting so that the shield jack shoe is separated from the inner peripheral surface of the skin plate in the shield radial direction, the rotation restricting means has a base end portion that is A shield jack shoe swing prevention and jack rod rotation prevention device , characterized in that the shield jack shoe is attached to an eccentric fitting and has the other end abutting against the inner peripheral surface of the skin plate . A shield jack shoe having an eccentric member for supporting the shield jack shoe pressing the front end face of the existing segment at the tip of the rod of the shield jack eccentrically with respect to the rod, and an anti-rotation device for the jack rod The rod or the eccentric member extends from the rod or the eccentric member to the inner peripheral surface of the skin plate and abuts against the inner peripheral surface of the skin plate to cause friction to restrict the rotation of the shield jack shoe and the rod. Provide rotation regulation means,
The eccentric member includes an eccentric fitting that eccentrically moves the shield jack shoe from the shield jack, and an eccentric rotating plate that is provided at the tip of the eccentric fitting and rotates to change the amount of eccentricity of the shield jack shoe. The rotation restricting means has a base end portion attached in advance to a side surface of the eccentric metal fitting, and the other end portion is configured to always contact the inner peripheral surface of the skin plate. Jack rod rotation prevention device. 4. The shield jack shoe swing and jack rod rotation according to claim 1 , wherein the other end portion of the rotation restricting means is configured to contact at least two or more locations in the circumferential direction of the skin plate. 5. Prevention device. 5. The shield jack shoe according to claim 4, wherein the contact portion of the other end portion of the rotation restricting means with the skin plate is formed of a resin material softer than the inner peripheral surface of the skin plate. Anti-rotation device.

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