JP6480206B2 - Shield machine - Google Patents

Description

  The present invention has a simple structure without adopting a large-scale structure, and in addition to changing the size of the segment, there is no need to change the configuration of the shield jack itself, such as replacement of parts, or to rotate the segment, thereby pressing the segment. It is related with the shield machine which can suppress a position to change and can press a segment with high position accuracy.

  2. Description of the Related Art Conventionally, various shield machines have been known that can continue excavation work in correspondence with segments whose dimensions are changed according to changes in the diameter of a tunnel to be excavated.

  The “two-stage shield machine” disclosed in Patent Document 1 is a two-stage shield machine that can be switched from a large-diameter shield to a small-diameter shield. The two-stage shield machine that can be switched from a large-diameter shield to a small-diameter shield for the purpose of improving the working efficiency of the excavation is a cutter disk, a large-diameter front trunk, a large-diameter middle folding part, a large-diameter Rear trunk, small-diameter front trunk, small-diameter middle fold, front-body fixing device, multiple middle-folded jacks, multiple shield jacks, erector device, soil removal mechanism, front-body fixing device, large-diameter rear body fixed to be able to be released It is possible to transmit a digging thrust generated by a plurality of shield jacks to a small-diameter front trunk via a plurality of middle-folding jacks so that a curved digging to the left or right is possible. Is There.

  The “shield jack and shield construction method of the shield machine” of Patent Document 2 has only one convex spherical engagement portion on the eccentric fitting fixed to the piston rod of the shield jack, so that the diameter of the tunnel to be excavated is increased or decreased. When switching, it is necessary to replace the eccentric bracket, requiring labor to prepare the shield jack, which is disadvantageous in terms of equipment costs, the eccentric bracket is fixed to the tip of the piston rod of the shield jack , Two convex spherical engagement parts on the eccentric metal fitting, which have different eccentric radii from the axial center of the jack body, and two convex spherical engagements having a phase difference of 90 degrees in the circumferential direction with respect to the axial center When switching to a different tunnel diameter from the middle of tunnel excavation, one of the convex spherical engaging parts that match the tunnel diameter is engaged with the concave spherical seat of the spreader. And pin connection is, is configured to transmit a propulsion reaction force against the shield jacks from spreader.

  Patent Document 3 “Reduced-diameter shield construction method and apparatus” provides a reduced-diameter shield construction method and apparatus capable of reducing the outer diameter of a segment by about 150 to 500 mm without requiring an intermediate shaft with a single shield machine. The outer shield skin plate, which is divided into a plurality of parts in the horizontal direction, is detachably attached to the outer periphery of the inner shield skin plate on the front body side of the shield machine, and the outer diameter of the segment is increased or decreased by rotating the eccentric hardware on the inner shield machine. The outer shield tail part of the integrated ring structure is detachably fixed with a pin on the rear trunk side, and the shield jack is aligned with the large-diameter segment to the predetermined position. Extrude and weld the inner shield tail to the predetermined position of the inner shield machine end, assemble the small diameter segment and seal Combined Dojakki its small diameter segment, it has a small diameter segment disconnect coupling of the pin so as to promote inner shield machine as a reaction force.

  The “shielding machine” disclosed in Patent Document 4 has an object to provide a shield machine that can switch between a large-diameter segment and a small-diameter segment as appropriate without deteriorating the sealing performance, and can promote reduction in tunnel construction costs. A shield machine capable of accommodating a large-diameter segment and a small-diameter segment, and a shield frame formed in a cylindrical shape based on the outer diameter of the large-diameter segment, and fixed to a rear inner peripheral surface of the shield frame A large-diameter tail seal whose tip is in contact with the outer peripheral surface of the large-diameter segment, and an inner surface where the outer peripheral surface is in contact with the tip of the large-diameter tail seal when it is attached to the rear inner peripheral surface of the shield frame. The cylinder is provided with a small-diameter tail seal that is fixed to the inner peripheral surface of the inner cylinder and whose tip is in contact with the outer peripheral surface of the small-diameter segment.

  The “shield jack mechanism” of Patent Document 5 aims to provide a shield jack mechanism that can easily keep the positional relationship between the shield jack shoe and the segment as appropriate, and pushes the assembled segment to push the shield machine. In the shield jack mechanism for advancing, a spreader for attaching a shield jack shoe is rotatably provided at the tip of the rod of the shield jack fixed to the shield frame, and a plurality of shoe mounting bosses are attached to the spreader and the shaft axis of the rod. The shield jack shoes are attached to one shoe mounting boss among these shoe mounting bosses so as to be replaceable.

  The “shield excavator and shield excavation method” of Patent Document 6 has an object to provide a shield excavator and a shield excavation method capable of forming a pipeline while changing the pipeline diameter by a segment with a small diameter difference. The inner skin plate is attached to the inner periphery of the rear part of the skin plate of the shield excavator, and the tail seal is attached to each skin plate. Then, by bringing the tail seals into close contact with the segment rings having different diameters, it is possible to prevent intrusion of soil and the like into the skin plate, and it is possible to continuously form pipe lines having different diameters. Furthermore, since the diameter of the inner skin plate can be freely set, it is possible to continuously form pipes having various diameters while accommodating a small diameter difference between adjacent segment rings. .

  Patent Document 7 “Propulsion Device and Method for Different Diameter Shield” aims to provide a propulsion device for a different diameter shield machine capable of dealing with tunnel digging of any diameter. In the propulsion device for a different diameter shield machine, Attached to the rod of the shield jack so as to be detachable, the eccentric length adjustment hardware whose eccentric length is preset according to the eccentric distance of the rod with respect to the tunnel diameter, and the outer periphery is formed in a shape corresponding to the tunnel diameter, and the rear end Is in contact with the existing segment, and the front end is provided with an adjusting shoe attached to the eccentric length adjusting hardware.

JP-A-11-093561 Japanese Patent Laid-Open No. 11-093571 JP 2000-054784 A JP 2000-073690 A JP 2000-291378 A JP 2002-220993 A Japanese Patent Laid-Open No. 2003-064984

  In the above background art, in order to cope with switching between a large-diameter segment and a small-diameter segment, a combination of a large-diameter and a small-diameter barrel, a combination of outer and inner shield skin plates, a combination of a shield frame and an inner cylinder, a skin The combination of the plate and inner skin plate used a large-scale structure that covers the entire construction of the shield machine.

  In addition, the eccentric rod with two convex spherical engagement parts with 90 ° phase difference can be fixed to the piston rod of the shield jack, or the spreader with multiple shoe mounting bosses with different positions can be rotated. Or an eccentric length adjusting hardware is detachably attached.

  However, since these are complicated in structure, the position is adjusted by using the amount of eccentricity and rotation, or the position is adjusted by exchanging various parts whose mounting accuracy is problematic. Therefore, there is a problem that it is difficult to press the segment with high positional accuracy, for example, the pressing position for pressing the segment is not constant and easily changes.

  The present invention was devised in view of the above-described conventional problems, and without adopting a large-scale structure, the structure is simple, and the configuration of the shield jack itself such as replacement of parts with respect to the change in the dimensions of the segment is achieved. It is an object of the present invention to provide a shield machine capable of preventing the change of the position for pressing the segment without changing or rotating, and pressing the segment with high positional accuracy.

A shield machine according to the present invention is a shield jack that is provided inside a hollow cylindrical skin plate, presses a segment arranged along the circumferential direction of the skin plate, and propels the skin plate with its reaction force A shield frame having a support frame provided inside the skin plate for supporting the shield jack, and a thickness along the radial direction of the skin plate that is formed on the support frame. A movement allowing portion that allows the shield jack to move in a radial direction of the skin plate with respect to the support frame in order to press the segment; and the shield jack is provided between the shield jack and the support frame. Positioning for positioning the support plate at the radial movement position of the skin plate Means and a detachable fixing means for fixing and supporting the positioned shield jack to the support frame, and the movement allowing portion has a length along the radial direction of the skin plate on the support frame. is formed in a hole shape, the shield jacks in place facing the said segments together to penetrate along the longitudinal length direction of the skin plate, a through hole that allows the movement of the shield jacks along the radial direction of the skin plate And the positioning means is provided integrally with the shield jack and a pair of inner and outer stoppers spaced apart from each other on the radially inner side and the outer side of the skin plate on the support frame. And disposed between the inner stopper and the outer stopper, the inner stopper and the outer stopper. A positioning member movable between the pads, and a gap filling member that is detachably mounted in a gap between the positioning member and the outer stopper and the inner stopper and positions the positioning member with respect to the support frame. And a member .

  The positioning member has a slide surface that is slid relative to the support frame to guide the movement of the shield jack.

  The inner stopper and the outer stopper are arranged on the side of the shield jack in the circumferential direction of the skin plate.

  The inner stopper and the outer stopper are disposed on both sides of the shield jack in the circumferential direction of the skin plate.

  The fixing means includes a long hole formed in the radial direction of the skin plate in the support frame, and a fastening member that fastens the support frame and the shield jack through the long hole. Features.

  The shield jack includes a spreader shoe that slides on the skin plate and presses the segment at the tip of a jack extending and contracting direction along the length direction of the skin plate, and between the spreader shoe and the skin plate. Is characterized in that a sliding member is detachably provided for closing the gap generated by moving the shield jack in the radial direction of the skin plate and guiding the slide movement of the spreader shoe on the skin plate. To do.

In the shield machine according to the present invention, the structure is simple without adopting a large-scale structure, and the configuration of the shield jack itself such as replacement of parts and the rotation operation are necessary for changing the size of the segment. Without this, it is possible to suppress a change in the position where the segment is pressed and press the segment with high positional accuracy. In addition, the movement allowance portion is provided in the support frame, and it is only necessary to form a through hole through which the shield jack passes in a long hole shape along the radial direction of the skin plate, and it is extremely easy for an existing shield machine. Can be provided.

It is a partially broken side view showing a schematic configuration of a preferred embodiment of a shield machine according to the present invention. In FIG. 1, it is an AA arrow directional view. FIG. 2 is an enlarged side view of a main part showing the periphery of a shield jack when the segment is thick in the shield machine shown in FIG. 1. FIG. 2 is an enlarged side view of a main part showing the periphery of a shield jack when the segment is thin, which is the shield machine shown in FIG. 1. FIG. 5A is a view of the periphery of the shield jack shown in FIG. 3 and FIG. 4 as viewed from the rear in the propulsion direction of the shield machine, and FIG. 5A is a view taken along the line B-B in FIG. ) Is a view taken along line CC in FIG.

  Hereinafter, a preferred embodiment of a shield machine according to the present invention will be described in detail with reference to the accompanying drawings. 1 is a partially broken side view showing a schematic configuration of a shield machine according to the present embodiment, FIG. 2 is a view taken along line AA in FIG. 1, and FIG. 3 is a shield machine shown in FIG. 4 is an enlarged side view of the main part showing the periphery of the shield jack when the segment is thick, and FIG. 4 is the shield machine shown in FIG. 1 and shows the periphery of the shield jack when the segment is thin. FIG. 5 is a view of the vicinity of the shield jack shown in FIGS. 3 and 4 as viewed from the rear in the propulsion direction of the shield machine, and FIG. -B line arrow figure and FIG.5 (B) are CC line arrow line views in FIG.

  As is well known in the art, the shield machine 1 is generally pushed by a reaction force generated by pressing the segment 3 with the shield jack 2. As shown in FIGS. 1 and 2, the shield machine 1 is provided with a hollow cylindrical body, for example, a hollow cylindrical body skin plate 4, and at the front end in the longitudinal length direction of the skin plate 4 facing the face. A cutter head 5 for excavating the face and a ring girder 6 provided inside the skin plate 4 as a supporting frame for reinforcing the skin plate 4 and supporting the shield jack 2 are mainly configured.

  The segment 3 is provided on the rear end side in the longitudinal direction of the skin plate 4 on the side opposite to the face. The segments 3 are handled by an erector, and are arranged in a plurality along the circumferential direction of the skin plate 4 so as to form an annular shape having a predetermined inner diameter, as shown in FIGS. 1 and 2.

  Each segment 3 alone has a predetermined length dimension along the longitudinal direction of the skin plate 4, a predetermined width dimension along the circumferential direction of the skin plate 4, and a predetermined dimension along the radial direction of the skin plate 4. It is formed in a block shape with a thickness dimension T. The segment 3 is disposed such that the front end surface 3 a in the length direction faces the ring girder 6.

  A plurality of shield jacks 2 that press the segments 3 are also provided in the skin plate 4 in an annular arrangement along the circumferential direction of the skin plate 4. The shield jack 2 is disposed along the longitudinal direction of the skin plate 4 so that the rod 2a is expanded and contracted in the longitudinal direction of the skin plate 4 to generate a pressing force.

  Specifically, the ring girder 6 is formed with a plurality of through-holes 7 that penetrate the shield jack 2 along the longitudinal direction of the skin plate 4 in an arrangement facing the front end surface 3a of the segment 3 (FIGS. 3 to 3). 5), each shield jack 2 is provided to face the front end face 3a of the segment 3 through each through hole 7.

  The shield jack 2 is supported by the ring girder 6 and propels the skin plate 4 (shield machine 1) toward the face by a reaction force generated by pressing the front end surface 3a of the segment 3. .

  In the segment 3, the thickness T along the radial direction of the skin plate 4 may be increased or decreased (T1) or thin (T2; T2 <T1) (see FIGS. 3 to 5). For example, as shown in FIGS. 1 and 2, there are cases where the segment 3 arranged in an annular form is thickened to reduce the inner diameter R, or the thickness T is decreased to increase the inner diameter R.

  3 to 5, the ring girder 6 is connected to the shield jack 2 in order to change the support position of the shield jack 2 according to the change of the thickness T of the segment 3 (T1 ← → T2). A movement allowing portion 8 that is movable in the radial direction of the skin plate 4 with respect to the girder 6 is formed.

  In the present embodiment, the movement allowing portion 8 is configured by forming the through hole 7 through which the shield jack 2 penetrates into a long hole shape along the radial direction of the skin plate 4. The movement of the shield jack 2 along the radial direction of the skin plate 4 is allowed by the long hole-shaped through hole 7, so that even if the thickness T of the segment 3 is increased or decreased (T1 ← → T2), the shield jack 2 2 can always press the front end surface 3a of the segment 3.

  Therefore, for example, when the center position of the thickness of the segment front end surface 3a is pressed by the shield jack 2 (indicated by the alternate long and short dash line X in FIGS. 3 and 4), the thickness of the segment 3 is increased or decreased and the center position of the thickness is changed. Even if it moves in the radial direction of the skin plate 4, the center position of the thickness is always pressed by the movement of the shield jack 2.

The movement permitting portion 8 is not limited to forming the through hole 7 in the shape of a long hole, and the shield girder 2 can be attached without causing the ring girder 6 to become an obstacle, such as by forming a groove or recess for movement in the ring girder 6. Any configuration may be used as long as a space that can be moved is secured .

  Between the ring girder 6 and the shield jack 2 movable relative to the ring girder 6, positioning means 9 for positioning the shield jack 2 on the ring girder 6 at the radial movement position of the skin plate 4. Is provided. The positioning means 9 includes an inner stopper 10 and an outer stopper 11 provided on the ring girder 6 side, a positioning member 12 provided on the shield jack 2 side, and a positioning member 12 between the inner stopper 10 and the outer stopper 11. The gap filling member 13 is mounted.

  The inner stopper 10 is positioned on the inner surface in the radial direction of the skin plate 4 on the rear surface 6a of the ring girder 6 on the rear side of the skin plate 4 in the front-rear length direction. It protrudes in a shelf shape toward the direction rear side, that is, the segment 3 side. The inner stopper 10 is provided integrally with the ring girder 6.

  Similarly, the outer stopper 11 is positioned on the rear surface 6a of the ring girder 6 on the outer side in the radial direction of the skin plate 4, and from the ring girder 6 toward the rear side in the longitudinal direction of the skin plate 4, that is, the inner stopper. 10 in parallel with the shelf. The outer stopper 11 is also provided integrally with the ring girder 6.

  A pair of the inner stopper 10 and the outer stopper 11 are provided on the rear surface 6 a of the ring girder 6 with a space therebetween in the radial direction of the skin plate 4. In the illustrated example, the inner stopper 10 and the outer stopper 11 are provided so as to face each other, but the positions may be shifted so as not to face each other.

  In the present embodiment, the inner stopper 10 and the outer stopper 11 are disposed on both sides of the shield jack 2 in the circumferential direction of the skin plate 4. That is, the shield jack 2 is positioned between the inner stoppers 10 and the outer stoppers 11 on both sides in the circumferential direction of the skin plate 4. However, it goes without saying that the inner stopper 10 and the outer stopper 11 may be provided only on one side of the shield jack 2 in the circumferential direction of the skin plate 4.

  Further, in the present embodiment, the inner stopper 10 and the outer stopper 11 are disposed on the side of the shield jack 2 in the circumferential direction of the skin plate 4. That is, the shield jack 2 and the inner stopper 10 and the outer stopper 11 are disposed to face each other in the circumferential direction of the skin plate 4.

  However, the inner stopper 10 and the outer stopper 11 are not on the side of the shield jack 2 in the circumferential direction of the skin plate 4 but on the radially inner side and the radially outer side of the skin plate 4 with respect to the shield jack 2. You may arrange in a position. For example, the inner stopper 10 may be disposed inside the shield jack 2 position and the outer stopper 11 may be disposed outside, or both the stoppers 10 and 11 may be disposed inside or outside the shield jack 2 position.

  The positioning member 12 is provided so as to face the rear surface 6a of the ring girder 6 with respect to the shield jack 2 that is passed through the through hole 7 of the ring girder 6 to the rear in the longitudinal direction of the skin plate 4. The positioning member 12 is formed of a flat plate member in the illustrated example.

  The positioning member 12 has a width dimension along the circumferential direction of the skin plate 4 having a narrow portion 12a corresponding to the width of the flange 2b provided in the shield jack 2, and both sides in the circumferential direction of the skin plate 4 from the narrow portion 12a. And a widened portion 12b having a width dimension larger than that of the narrow portion 12a. The narrow portion 12a of the positioning member 12 is formed with an insertion hole 12c through which the shield jack 2 is inserted almost without any gap.

  Of the front and back surfaces of the positioning member 12, one surface (hereinafter referred to as the front surface) 12d is in contact with the narrow portion 12a of the flange 2b of the shield jack 2 around the insertion hole 12c, and the bolt and nut. 14 and the like, whereby the positioning member 12 is integrally provided on the shield jack 2. The other surface (hereinafter, referred to as a back surface) 12e of the positioning member 12 is brought into contact with the rear surface 6a of the ring girder 6 so as to be able to come into contact with and separate from the ring girder 6, and this back surface 12e is used to guide the movement of the shield jack 2. 6 functions as a slide surface that is slidably moved relative to the rear surface 6a.

  In the longitudinal direction of the skin plate 4, the elongated through hole 7 of the ring girder 6 and the insertion hole 12 c of the positioning member 12 are always in communication with each other in the moving range of the shield jack 2. It has become.

  The widening portion 12b of the positioning member 12 is disposed between the inner stopper 10 and the outer stopper 11, so that the positioning member 12 can be moved between the inner stopper 10 and the outer stopper 11. The widened portion 12 b is positioned between the inner stopper 10 and the outer stopper 11 so as to face the inner stopper 10 and the outer stopper 11 along the radial direction of the skin plate 4. The widened portion 12 b is formed with a size that can move in the radial direction of the skin plate 4 between the inner stopper 10 and the outer stopper 11.

  Therefore, when the shield jack 2 is moved in the radial direction of the skin plate 4, the slide surface 12e of the positioning member 12 slides along the rear surface 6a of the ring girder 6 to guide the movement of the shield jack 2. At this time, the widened portion 12 b is moved between the inner stopper 10 and the outer stopper 11.

  When the widened portion 12b moves to a position where it comes into contact with the inner stopper 10, a maximum gap is formed between the widened portion 12b and the outer stopper 11. On the contrary, when the widened portion 12b moves to a position where it comes into contact with the outer stopper 11, At a position where the maximum gap is generated and does not come into contact with any of the stoppers 10 and 11, a gap is generated between both the inner stopper 10 and the outer stopper 11.

  The gap filling member 13 is detachably mounted in a gap between the positioning member 12 and the outer stopper 11 and the inner stopper 10 in order to position the positioning member 12 with respect to the ring girder 6. When the widened portion 12b of the positioning member 12 is in contact with any one of the stoppers 10, 11, for example, the outer stopper 11, the gap filling member 13 is mounted between the inner stopper 10 that is not in contact with the widened portion 12b. When both the stoppers 10 and 11 are not in contact with each other, they are respectively mounted between the inner stopper 10 and the outer stopper 11 and the widened portion 12b.

  As the gap filling member 13, a conventionally known liner material or the like is employed. By closing the gap with the gap filling member 13, the widened portion 12 b is positioned between the inner stopper 10 and the outer stopper 11, whereby the positioning member 12 is positioned with respect to the ring girder 6, whereby the shield jack 2 is Then, the skin plate 4 is positioned with respect to the ring girder 6 at the radial movement position.

  Since the gap filling member 13 is configured by overlapping plate pieces having a constant thickness, the shield jack 2 is moved with respect to the ring girder 6 and also with respect to the segment 3 by using the constant thickness of the plate pieces as an adjustment pitch. The position is adjusted.

  In the present embodiment, the positioning means 9 includes a flat plate-like positioning member 12 having an inner stopper 10 and an outer stopper 11 formed in a shelf shape, and a widened portion 12b that moves between the stoppers 10 and 11, and a widened portion. Although the case where it comprises with the clearance gap filling member 13 with which 12b and the stoppers 10 and 11 are mounted | worn is demonstrated, it is not restricted to such a structure.

  That is, if it is a structure which can be positioned, for example, the inner stopper 10 and the outer stopper 11 are in the form of a slide slot formed in the ring girder 6 with an appropriate length along the radial direction of the skin plate 4, and replaced with the widened portion 12b. Thus, the positioning member 12 may be provided with a sliding projection that slides slidably within the sliding slot, and the gap filling member 13 may position the movement position of the sliding projection within the sliding slot.

  Alternatively, a plurality of holes arranged along the radial direction of the skin plate 4 on the ring girder 6 side and the flange 2b side of the shield jack 2 and a series of these holes matched at the moving position of the shield jack 2 You may comprise a positioning means from the pin to insert. Thus, it goes without saying that a conventionally known positioning mechanism may be adopted.

  Furthermore, a fixing means 15 for fixing and supporting the shield jack 2 positioned by the positioning means 9 to the ring girder 6 is provided. In the present embodiment, the fixing means 15 is provided between the positioning member 12 of the positioning means 9 and the ring girder 6.

  Specifically, the fixing means 15 includes a bolt 15a that penetrates the positioning member 12 toward the rear surface 6a of the ring girder 6, and a skin plate 4 on the rear surface 6a of the ring girder 6 in accordance with the position of the bolt 15a. A bolt for inserting a bolt 15a through a long hole 15b and a bolt-inserting long hole 15b formed in parallel with the long through hole 7 along the radial direction of the long hole 15b. 12 and the ring girder 6 are detachably fastened to the nut 15c.

  By fastening the positioning member 12 to the ring girder 6 with the fastening members of the bolts 15a and nuts 15c, the shield jack 2 integrally provided with the positioning member 12 is fixed and supported by the ring girder 6.

  As is well known in the art, the shield jack 2 is configured to slide on the skin plate 4 and press the segment 3 to the tip of the jack in the longitudinal direction of the skin plate 4 along the longitudinal direction of the skin plate 4, that is, the rear end of the rod 2a. A spreader shoe 16 is provided.

  When the shield jack 2 is moved in the radial direction of the skin plate 4, the spreader shoe 16 is similarly moved in the radial direction with respect to the skin plate 4. The movement of the spreader shoe 16 causes a gap between the spreader shoe 16 and the skin plate 4 by the same amount as the movement amount.

  In the present embodiment, a gap formed by the shield jack 2 being moved in the radial direction of the skin plate 4 is closed between the spreader shoe 16 and the skin plate 4, and the spreader shoe 16 on the skin plate 4 is closed. A sliding member 17 for guiding the sliding movement is detachably provided.

  Specifically, the sliding member 17 is detachably provided on the outer surface 16 a of the spreader shoe 16 facing the skin plate 4. As the sliding member 17, a liner material similar to the gap filling member 13 is used. The gap is filled by the sliding member 17, and the spreader shoe 16 is slid on the skin plate 4 regardless of the movement of the shield jack 2.

  Next, the effect | action of the shield machine 1 which concerns on this embodiment is demonstrated with reference to FIGS. In the present embodiment, the case where the outer diameter R1 of the segment 3 in the annular array is held constant and only the inner diameter is narrowed (R2 → R3; R2> R3) will be described as an example. When the inner diameter before the inner diameter is narrowed (R2) is wide (R2), as shown in FIGS. 3 and 5A, the thickness of the segment 3X is thin (T2), and when the inner diameter is narrowed (R3), 4 and FIG. 5B, the segment is switched to the thick (T1) segment 3Y.

  If the outer diameter is the same, the thin segment 3X has a center position in the radial direction of the skin plate 4, and the support position of the shield jack 2 is also moved to the outside accordingly. The center position of the thickness is the inner side in the radial direction of the skin plate 4, and the support position of the shield jack 2 is moved inward accordingly.

  In the example shown in FIG. 3 and FIG. 5A, when the inner diameter is widened by the thin segment 3X, the widened portion 12b of the positioning member 12 provided integrally with the shield jack 2 is the outer stopper. 11 is contacted. Therefore, the gap filling member 13 is mounted between the inner stopper 10 and the widened portion 12b, and thereby the support position of the shield jack 2 is positioned outward.

  Further, the positioned shield jack 2 is fixed to the ring girder 6 by a bolt 15a positioned on the radially outer side of the skin plate 4 and a nut 15c screwed to the long hole 15b of the fixing means 15. And supported. In this example, the spreader shoe 16 is slid directly on the skin plate 4.

  In this way, in a state where the shield jack 2 is positioned on the radially outer side of the skin plate 4, the front end surface 3 a of the thin segment 3 </ b> X is pressed by the shield jack 2, and the reaction force causes the shield machine 1. Is promoted.

  When switching to the thick segment 3Y in order to narrow the inner diameter, first, the nut 15c is loosened, the bolt 15a is removed from the elongated hole 15b, and the fixing means 15 is detached. Next, the gap filling member 13 of the positioning means 9 is separated from the gap between the inner stopper 10 and the widened portion 12b.

  Next, the widened portion 12 b of the positioning member 12 that is movable between the inner stopper 10 and the outer stopper 11 is moved inward in the radial direction of the skin plate 4 together with the shield jack 2 with respect to the ring girder 6. At this time, the positioning member 12 has a slide surface 12e that is slidably moved with respect to the rear surface 6a of the ring girder 6. Therefore, by using this slide surface 12e, the shield jack 2 in the long hole-like through-hole 7 is used. Guide the move.

  In the illustrated example, the movement state of the shield jack 2 is such that the gap dimension s1 on the inner side of the skin plate 4 between the shield jack 2 and the through hole 7 in FIG. 4 is greater than the gap dimension s2 (> s1) in FIG. In FIG. 5A, the upper end of the positioning member 12 and the inner edge of the ring girder 6 are displaced in the radial direction of the skin plate 4 (indicated by s3 in the figure; FIG. 4 also). In contrast, in FIG. 5B, it is indicated that there is no displacement.

  In the example shown in FIGS. 4 and 5B, when the inner diameter is narrowed by the thick segment 3Y, the widened portion 12b of the positioning member 12 is brought into contact with the inner stopper 10. Therefore, the gap filling member 13 is mounted between the outer stopper 11 and the widened portion 12b, and thereby the support position of the shield jack 2 is positioned radially inward when switching to the thick segment 3Y. .

  Thereafter, in the elongated hole 15b of the fixing means 15, the positioning member 12 and also the shield jack 2 are connected to the ring girder by the bolt 15a positioned radially inward of the skin plate 4 and the nut 15c screwed to the bolt 15a. 6 is fixed and supported.

  In addition, when the shield jack 2 is moved inward in the radial direction of the skin plate 4, a gap is formed between the spreader shoe 16 and the skin plate 4, so that the gap is closed and the spreader shoe 16 is moved to the skin plate. 4, the sliding member 17 is attached to the outer surface 16 a of the spreader shoe 16.

  In this way, with the shield jack 2 positioned on the radially inner side of the skin plate 4, the front end surface 3a of the thick segment 3Y is pressed by the shield jack 2, and the reaction force causes the shield machine 1 is promoted.

  The illustrated example is a case in which the shield jack 2 is moved in the radial direction of the skin plate 4 by the amount of movement in which the widened portion 12b is in direct contact with either the outer stopper 11 or the inner stopper 10. Of course, it is possible to position the shield jack 2 at an intermediate position where the widened portion 12b is not in contact with the stoppers 10 and 11 by mounting them between the inner stopper 10 and the outer stopper 11 and the widened portion 12b.

  In the case of increasing the inner diameter, the shield jack 2 may be moved to the outer side in the radial direction of the skin plate 4 contrary to the case of reducing the inner diameter. In the above description, the case where only the inner diameters R2 and R3 are changed with the same outer diameter R1 is described. However, even when only the outer diameter is changed with the same inner diameter, both the inner diameter and the outer diameter are changed. Of course, the shield jack 2 may be moved in the same manner as described above.

  In the shield machine 1 according to the present embodiment described above, the ring girder 6 that is provided inside the skin plate 4 and supports the shield jack 2, the ring girder 6, and the diameter of the skin plate 4. In order to press the segment 3 whose thickness along the direction is increased / decreased, the elongated through hole 7 serving as a movement allowing portion 8 that allows the shield jack 2 to move in the radial direction of the skin plate 4 with respect to the ring girder 6. And positioning means 9 for positioning the shield jack 2 on the ring girder 6 at the radial movement position of the skin plate 4, and the positioned shield jack 2 are provided between the shield jack 2 and the ring girder 6. A detachable fixing means 15 for fixing and supporting the ring girder 6 and supporting the shield girder 2 On the other hand, since the skin plate 4 can be constituted by only the movement allowing portion 8 that enables the skin plate 4 to move in the radial direction, the positioning means 9 that positions at the moving position, and the fixing means 15 that is fixed after positioning, the annularly arranged segments Even if the inner diameter and outer diameter of 3 are changed in the middle, the structure is simple without adopting the large structure as in the background technology. Thus, it is not necessary to change the configuration of the shield jack 2 itself or to perform a rotation operation, thereby suppressing the change in the position where the segment 3 is pressed, and the segment 3 can be pressed with high positional accuracy.

  For example, it is sufficient for the movement allowing portion 8 to form the through hole 7 through which the shield jack 2 penetrates in the shape of a long hole, and it can be easily provided for an existing shield machine.

  The positioning means 9 is integrally provided on the ring girder 6 on the shield jack 2 and the inner stopper 10 and the outer stopper 11 which are provided at a distance from each other on the radially inner side and the outer side of the skin plate 4. A positioning member 12 having a widened portion 12b which is disposed between the inner stopper 10 and the outer stopper 11 and is movable between the inner stopper 10 and the outer stopper 11, and a widened portion 12b of the positioning member 12. Since it is configured to include a gap filling member 13 that is detachably mounted in the gap between the outer stopper 11 and the inner stopper 10 and positions the positioning member 12 with respect to the ring girder 6, it is referred to as the radial direction of the skin plate 4. Positioning with respect to movement in one direction can be performed with a simple structure and easy work.

  Since the gap filling member 13 is mounted in the gap, the thickness of the gap filling member 13 can be adjusted at a plurality of movement positions, and the shield jack 2 can be changed in various thicknesses of the segment 3. It can be made to move appropriately corresponding to.

  Since the positioning member 12 has a slide surface 12e that is slidably moved with respect to the rear surface 6a of the ring girder 6 in order to guide the movement of the shield jack 2, the positioning member 12 provided integrally with the shield jack 2 is provided. The sliding surface 12e can be slid along the rear surface 6a of the ring girder 6, and the shield jack 2 can be guided and moved smoothly with good operability.

  Since the inner stopper 10 and the outer stopper 11 are arranged on the side of the shield jack 2 in the circumferential direction of the skin plate 4, these stoppers 10 are provided rather than being positioned above or below the shield jack 2. , 11 does not increase the dimension of the skin plate 4 in the radial direction, and the positioning means 9 can be installed in a compact and space-saving manner.

  Since the inner stopper 10 and the outer stopper 11 are arranged on both sides of the shield jack 2 in the circumferential direction of the skin plate 4, the position fixing function and the support function to the ring girder 6 are provided rather than the case of providing only on one side. Can be improved.

  The fixing means 15 fastens the ring girder 6 and the positioning member 12, and eventually the shield jack 2 to the ring girder 6 through the long hole 15b formed along the radial direction of the skin plate 4, and the long hole 15b. Since the bolt 15a and the fastening member such as the nut 15c are provided, and the elongated hole 15b is provided, the shield jack 2 can be appropriately fixed at any position in the moving direction, and the ring girder 6 is stable. Can be supported.

  The shield jack 2 is provided with a spreader shoe 16 that slides on the skin plate 4 and presses the segment 3 at the front end of the jack extending and contracting direction along the length direction of the skin plate 4, that is, at the rear end of the rod 2a. A sliding member that guides the sliding movement of the spreader shoe 16 on the skin plate 4 by closing the gap generated by moving the shield jack 2 in the radial direction of the skin plate 4 between the skin plate 4 and the skin plate 4. Since 17 is provided detachably, even if the shield jack 2 is moved, the movement of the spreader shoe 16 on the skin plate 4 can be smoothly guided, and the segment 3 can be pressed appropriately.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Shield jack 2a Rod 3 Segment 4 Skin plate 6 Ring girder 8 Movement allowance part 9 Positioning means 10 Inner stopper 11 Outer stopper 12 Positioning member 12e Slide surface 13 Gap filling member 15 Fixing means 15a Bolt 15b Long hole 15c Nut 16 Spreader shoe 17 Sliding member T, T1, T2 Segment thickness

Claims (6)

A shield machine having a shield jack which is provided inside a hollow cylindrical skin plate, presses a segment arranged along the circumferential direction of the skin plate, and propels the skin plate by its reaction force,
A support frame provided inside the skin plate for supporting the shield jack;
A movement that allows the shield jack to move in the radial direction of the skin plate with respect to the support frame to press the segment that is formed on the support frame and whose thickness along the radial direction of the skin plate is increased or decreased. An allowable part;
Positioning means provided between the shield jack and the support frame for positioning the shield jack on the support frame at a radial movement position of the skin plate;
Removable fixing means for fixing and supporting the positioned shield jack to the support frame,
The movement allowing portion is formed in the support frame in the shape of a long hole along the radial direction of the skin plate, and penetrates the shield jack along the longitudinal direction of the skin plate in an arrangement facing the segment. A through hole that allows movement of the shield jack along the radial direction of the skin plate ,
The positioning means is provided integrally with the shield jack and a pair of inner and outer stoppers provided at a distance from each other on the support frame on the radially inner side and outer side of the skin plate. And a positioning member which is disposed between the inner stopper and the outer stopper and is movable between the inner stopper and the outer stopper, and is attached to and detached from a gap between the positioning member and the outer stopper and the inner stopper. A shield machine that is freely mounted and includes a gap filling member that positions the positioning member with respect to the support frame . 2. The shield machine according to claim 1, wherein the positioning member has a slide surface that is slidably moved with respect to the support frame in order to guide the movement of the shield jack. 3. The shield machine according to claim 1, wherein the inner stopper and the outer stopper are arranged on a side of the shield jack in a circumferential direction of the skin plate. The shield inner machine according to any one of claims 1 to 3, wherein the inner stopper and the outer stopper are disposed on both sides of the shield jack in a circumferential direction of the skin plate. The fixing means includes a long hole formed in the radial direction of the skin plate in the support frame, and a fastening member that fastens the support frame and the shield jack through the long hole. The shield machine according to any one of claims 1 to 4 , wherein the shield machine is provided. The shield jack includes a spreader shoe that slides on the skin plate and presses the segment at the tip of a jack extending and contracting direction along the length direction of the skin plate, and between the spreader shoe and the skin plate. Is characterized in that a sliding member is detachably provided for closing the gap generated by moving the shield jack in the radial direction of the skin plate and guiding the slide movement of the spreader shoe on the skin plate. The shield machine according to any one of claims 1 to 5 .

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