JP3279407B2 - Erecta shield shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erector of a shield excavator used for lining an underground pit excavated by a shield excavator with a segment, and more particularly, to assembling a segment in a lining operation. This is useful for a shield excavator erector called a segment automatic assembling apparatus, which is fully automated.

[0002]

2. Description of the Related Art As is well known, a shield excavator is an excavator that excavates a cutting face with a cutter at the front of the shield body while applying thrust to a shield body with a shield jack, and excavates an underground pit. . On the peripheral wall of an underground pit excavated for a predetermined unit length, a segment is lined and the underground pit is lining. Machine is used. When performing lining work with this erector, the segment that has been loaded in advance below the erector is gripped by the segment gripping mechanism of the erector, or the gripped segment is rotated to a predetermined position, and then moved along the underground pit peripheral wall. In order to join with the existing segment that has already been stretched, positioning is performed so that the position and the posture are aligned with the existing segment. When working with an erector, it is necessary to grip the segment with the segment gripping mechanism and position the gripped segment so as to align with the existing segment. Electors that can be operated by a mechanism have been conventionally developed. Recently, there has emerged an elector called an automatic segment assembling apparatus which completely automates the assembling of segments during lining work. Such an apparatus is disclosed in, for example, Japanese Patent Application Laid-Open Nos. No. 25197. An object of the present invention is to improve the above-described erector so that the above-described positioning by the control mechanism can be stably performed.

Therefore, as an example of a conventional technique to be improved by the present invention, an erector of a shield excavator as disclosed in the above-mentioned JP-A-3-14499 and JP-A-3-25197 is described. 5 and FIG. 6 and an outline of the technique will be described below with reference to these drawings.
5 is a cross-sectional view of a section of an erector installation portion of a shield machine in which an erector according to the related art is installed as viewed from a tail side of a shield, FIG. 6 is a cross-sectional view taken along line CC of FIG. 5, and FIG.
FIG. 6 is an enlarged sectional view of a segment gripping mechanism in the erector of FIG. 5. For details of this erector, refer to the above-mentioned published patent publication.

In FIGS. 5 and 6, reference numeral 1 denotes a shield body having a cutter (not shown) at a front portion and a rear portion being propelled by a shield jack (not shown) while taking a reaction force at an existing segment. Numeral 2 denotes an erector which is installed in the shield main body 1 and is operated to rotate. Reference numeral 3 denotes a plurality of rollers (only one is shown in FIG. 5) fixed to the inner wall of the shield main body 1 . This is an erector ring as a rotating part of the erector 2 rotatably supported by rollers 3. Although not shown in the figure, a ring gear that meshes with the pinion is formed on the inner peripheral portion of the electret ring 4.
By driving the pinion by a hydraulic motor or the like (not shown), the pinion can be rotated in a desired direction in a normal or reverse direction by a desired angle. 5 is a pair of arms protruding from the left and right of the rear of the electret ring 4, 6 is a pair of guide rods slidably fitted to the pair of arms 5, respectively, and 7 is provided at the center beam 7a and at both ends thereof. The end beams 7b are formed in a substantially U-shape with the end beams 7b. The end beams 7b are attached to the lower ends of the pair of guide rods 6 so as to be slidably supported by the pair of arms 5. The suspension beam 8 is attached to the pair of arms 5 on the cylinder side, and each end beam 7b of the suspension beam 7 is attached to the piston rod side.
It is a pressing jack attached to the. The pair of pressing jacks 8 can expand and contract by hydraulic pressure, so that the suspension beam 7 can be moved in the radial direction of the erector ring 4 while sliding the guide rod 6 with respect to the arm 5. Numeral 10 denotes a gripping segment which is a segment that has been carried in from the wellhead and has not yet been positioned by the erector 2, and 11 is an existing segment that has already been positioned and assembled on the underground pit wall by the erector 2. Bolt mounting grooves 10a are formed in the peripheral edge of the grip segment 10 at predetermined intervals so that the ends of bolts for fixing adjacent segments can be projected and it is convenient to tighten nuts. A grout screw hole 10b for screwing a grout nozzle at the time of back-filling is formed, and each of these is a well-known configuration usually provided in a segment. In addition, a bolt insertion hole (reference numeral 10 in FIGS . 1, 3, and 4) for inserting the above-mentioned bolt is provided in the hole wall on the end face side of the bolt mounting groove 10a .
c) is formed.

Reference numeral 20 denotes a segment guide positioning mechanism attached to the center beam 7a of the suspension beam 7, and reference numeral 30 denotes an arc-shaped outer peripheral surface abutting portion that abuts the inner peripheral surface of the gripping segment 10. A segment guide 31 suspended from the center shaft 21 is built in the segment guide 30 and holds the segment segment 10.
This is a segment gripping mechanism which is a mechanism for gripping the contact portion of the segment guide 30 in a contact state. The segment guide 30 and the segment gripping mechanism 31 will be described later in detail with reference to FIG. The segment guide positioning mechanism 20 includes a Z-axis that is an axis in the axial direction of the shield body 1, an X-axis that is a horizontal axis that is orthogonal to the Z-axis, and a Y-axis that is a vertical axis that is orthogonal to the Z-axis. A mechanism for correcting the position of the segment guide 30 so that the segment guide 30 can be positioned, and further, rotation (pitching) around the X axis,
Various positioning mechanisms are provided, such as a mechanism for correcting the position of the segment guide 30 for the rotation (yaw) around the Y axis and the rotation (rolling) around the Z axis so that the segment guide 30 can be positioned. By providing such a segment guide positioning mechanism 20 in the erector 2, when the grasping segment 10 carried in below the erector 2 is to be brought into contact with the abutting portion of the segment guide 30 and is to be grasped, the segment guide 30 is used. Can be corrected and positioned so as to match the position and posture of the grip segment 10. When the gripping segment 10 is gripped by the erector 2 and moved, and then positioned at a location adjacent to the existing segment 11 already lined with the underground pit wall, and when it is to be joined to the segment 11 by bolts, The position and posture of the grip segment 10 at the time of joining can be determined so as to match the position and posture of the existing segment 11. In order to enable such a positioning to be performed by the control mechanism, the grip segment 1 carried in below the erector 2
In order to measure the relative positional relationship of the segment guide 30 with respect to 0, sensors such as 32, 33, and 34 for measuring the distance to the grip segment 10 are provided at key points of the segment guide 30. A sensor (not shown) for measuring the distance to the existing segment 11 so that the relative position of the gripping segment 10 to the existing segment 11 that is provided and already lined with the underground pit wall can be measured. ) Are provided at appropriate places of the erector 2 such as the suspension beam 7. This sensor is provided symmetrically in pairs at regular intervals in the Z-axis direction. Usually, the sensors are stored in the erector 2, but the grip segment 10 gripped by the segment guide 30 is attached to the existing segment 11. When attempting to position at an adjacent position, the segment can be positioned so as to face the inner peripheral surface of the existing segment 11 by extending in the Z-axis direction. As a result, this sensor can measure the distance between the inner peripheral surface of the existing segment 11 and any point along the circumferential direction by rotating the erector 2 in the desired direction. it can.

Next , the segment guide 3 will be described with reference to FIG.
In the figure, reference numeral 30 indicates a segment guide positioning mechanism 20.
The above-described segment comprising a cylindrical hanging portion 30a swingably hung on the central axis 21 (see FIG. 6) of the first and second portions and a guide frame 30b having an arc-shaped outer peripheral surface having the same curved surface as the inner peripheral surface of the gripping segment 10. The guide is a guide, and a storage space for receiving and installing the above-described segment gripping mechanism 31 is formed inside the guide. Although not shown, the segment guide 30 has a grip segment 10.
Is also attached to the existing segment 11 with bolts. This segment gripping mechanism 3
1 is roughly divided into a cylindrical holding frame 31a concentrically mounted in the storage space of the hanging portion 30a at an interval from the cylindrical hanging portion 30a of the segment guide 30, and the holding frame 31a Cylindrical hanging part 3
And a pair of gripping jacks 31b and 31c arranged symmetrically in the vertical direction in a space between the pair of gripping jacks 31b and 31c and driven vertically by the pair of gripping jacks 31b and 31c to be slidable in a cylindrical gripping frame 31a. , A piston-shaped sliding body 31d provided on the sliding member, a screw shaft 31g rotatably attached to the sliding body 31d, and a drive motor 31i such as a hydraulic motor for rotating the screw shaft 31g. The grip frame 31a is a piston-like sliding body 3
A cylinder portion 31a1 for slidably fitting 1d, a flange portion 31a2 provided on the outer periphery of the cylinder portion 31a1 and attaching it to the segment guide 30;
It comprises a stopper portion 31a3 protruding from the lower end of the cylinder portion 31a1 so that the lower end of the sliding portion 31d slides downward, and a guide groove 31a5 formed in the cylinder portion 31a1 in the vertical direction. Each gripping jack 31
The lower ends of the cylinders b and 31c are rotatably mounted on the flange portion 31a2 of the gripping frame 31a by the bracket 31a4, and the upper end of the piston rod is mounted on the bracket 3a.
1e, it is rotatably attached to the upper end of the sliding body 31d. The piston-like sliding body 31d has a guide piece 31d1 protruding from the peripheral wall, and is slidably fitted into a guide groove 31a5 of the gripping frame 31a.
Is guided in the axial direction in the cylinder portion 31a1. The cylinder part 31a of this gripping frame 31a
A small gap m is provided in advance between the inner peripheral surface of No. 1 and the outer peripheral surface of the sliding body 31d. And this sliding body 31d
Is rotatably connected to both gripping jacks 31b and 31c via brackets 31a4 and 31e.
It is possible to swing slightly in the X-axis direction so that play occurs, and to allow play in the Z-axis direction, a small play is provided at the connection point between the two holding jacks 31b and 31c. I have to. The screw shaft 31g is composed of a lower screw portion 31g1 screwed into the grout screw hole 10b of the gripping segment 10 and a shaft portion 31g2 above the screw portion 31g2. The shaft portion 31g2 is formed by a bearing 31f at the bottom of a cylindrical sliding body 31d. Is rotatably supported. The drive motor 31i is mounted on a flange 31j protruding from the inner periphery of the slide 31d, and its drive shaft is connected to a shaft portion 31g2 of a screw shaft 31g via a shaft coupling 31h.

Since the conventional erector has the above configuration, the lower surface of the guide frame 30b of the segment guide 30 is attached to the gripping segment 10 carried below the erector 2 by operating the erector ring 4 and the pressing jack 8. , The distance between the gripping segment 10 and each of the sensors is measured by sensors 32, 33, and 34 provided at various positions of the segment guide 30, and the measurement results are set in advance. The segment guide positioning mechanism 20 is controlled and operated by the control mechanism so that the respective reference values are obtained, and the segment guide 30 is positioned so as to match the position and posture of the gripping segment 10. In the state where the segment guide 30 is positioned in this manner, the axis of the screw shaft 31g of the segment gripping mechanism 31 housed therein is aligned with the center line of the grout screw hole 10b of the gripping segment 10.
Gripping jack 31b while rotated the screw shaft 31g by a drive motor 31i, by lowering the slider 31d in 31c, screwing a threaded portion 31g ₁ of the screw shaft 31g grout screw hole 10b. When such a screwing operation is performed, even if the axis of the screw shaft 31g is slightly deviated from the center line of the grout screw hole 10b due to a control error, the outer peripheral surface of the sliding body 31d that supports the screw shaft 31g and the grip frame 31 are supported.
Between the a inner circumferential surface of the cylinder portion 31a ₁ of, as described above, X relative sliding body 31d is provided fine clearances m
Since play is caused in the axial direction and the Z-axis direction, the screw shaft 31g swings in the process of being screwed into the grout screw hole 10b, and the deviation is absorbed, which hinders the operation. There is no such thing. In this way, when the threaded portion 31g ₁ of the screw shaft 31g screwed into grout screw hole 10b of the existing segment 10, gripping jack 31
The existing segment 10 is pulled up by extending the b and 31c so that the inner peripheral surface thereof is sufficiently attracted so as to contact the arc-shaped outer peripheral surface of the guide frame 30b. Is completed. After completing the gripping operation, the gripping segment 10 is moved to an area adjacent to the existing segment 11 to be joined. In this case, the pressing jack 8 is shortened to raise the gripping segment 10. After letting
The gripper segment 10 is moved to an area adjacent to the existing segment 11 by rotating the erector ring 4 by a predetermined angle. Next, the position and posture of the grip segment 10 at the time of joining are determined by using the existing segment 1 to be joined.
In such a case, the pair of separately provided sensors are moved to a position facing the inner peripheral surface of the existing segment 11 in such a case.
Extend in the axial direction, these sensors and the existing segment 1
The distance between the inner peripheral surfaces of the existing segment 11 is measured by measuring the distance between the inner peripheral surfaces of the erector 2 at a predetermined measurement point on the inner peripheral surface while rotating the erector 2. Then, based on the measurement result, first, the segment guide positioning mechanism 20 is driven and controlled by the control mechanism to correct the attitude of the segment guide 30 so that the attitude of the grip segment 10 matches the attitude of the existing segment 11. And perform positioning. After the positioning with respect to the posture of the gripping segment 10 is completed, the pressing jack 8 is set based on the measurement result.
To move the gripping segment 10 to the existing segment 1
1 is moved in the radial direction to a position opposing the face-side end face and positioned with respect to the radial position. And press it. In the state where the gripping segment 10 is positioned with respect to the existing segment 11 in this manner, the bolt holes 10c of the two segments 10 and 11 are aligned with each other. The unit process of the lining operation by the erector 2 is completed. that's all,
The outline of the lining work by the conventional erector has been described. For details, refer to the above-mentioned published patent publication, in particular, Japanese Patent Publication No. 3-144099.

[0008]

In the prior art, the grip segment 10 is moved relative to the existing segment 11 by the erector 2.
When the positioning is to be performed by using the above, the relative position of the gripping segment 10 with respect to the existing segment 11 is measured by measuring each distance between the existing segment 11 and each sensor provided on the erector 2 as described above. For proper positioning, it is premised that the positional relationship between the grip segment 10 gripped by the segment guide 30 and the sensor does not change during the positioning operation, and if the positional relationship fluctuates. Otherwise, the positioning of the grip segment 10 cannot be performed stably. However, according to the related art, the grip segment 10 is connected to the screw shaft 31 g of the segment grip mechanism 31.
, The gripping is performed by pulling the segment guide 30 into contact with the segment guide 30, so that no displacement occurs in the Y-axis direction or the Z-axis direction, but the X-axis direction, the Z-axis direction, the X-axis rotation, Since the positional deviation around the axis is prevented by the frictional force between the inner peripheral surface of the grip segment 10 and the outer peripheral surface of the segment guide 30, when an external force larger than the frictional force is applied to the grip segment 10, Can no longer prevent these misalignments. That is, in the conventional shield excavator erector,
Between the outer peripheral surface and the inner peripheral surface of the cylinder portion 31a ₁ of the gripping frame 31a of the sliding body 31d, as described above, in the X-axis direction and the Z-axis direction with respect to the sliding body 31d is provided fine clearances m Since the play is caused, when such an external force is applied, the grip segment is displaced with respect to the sensor in the X-axis direction, the Z-axis direction, and around the X-axis. Even if the slide body 31d is designed so that such play does not occur, since the grip segment 10 is gripped by screwing with the screw shaft 31g, at least around the Y axis. The displacement cannot be prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and is intended to solve the problem. When positioning a gripping segment with respect to an existing segment by an erector, the positioning is always stabilized. It is an object of the present invention to provide an erector of a shield machine that can be performed by using a shield machine.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanism for gripping a grip segment.
A segment guide for holding the holding segment abuts, Oite the Elekta Sea <br/> shield excavator comprising a segment guide positioning mechanism for positioning by correcting the position and orientation of the segment guide, the locking means A gripping segment fixing mechanism for fixing the gripping segment to the segment guide by abutting and locking the gripping segment on the wall surface of the bolt mounting groove of the gripping segment is attached to the segment guide. " This is achieved by an erector of a shield excavator as described in US Pat.

[0011]

The erector of the shield machine according to the present invention is provided with such a configuration, so that the grip segment is segmented.
When the gripping segment fixing mechanism is actuated after completing the gripping operation of the gripping segment that abuts on the guide segment, the locking means abuts against the wall surface of the bolt mounting groove of the gripping segment and locks the gripping segment to the segment guide. Fix it. Therefore, the displacement of the grip segment is
Due to the frictional force caused by the contact of the grip segment with the guide
In addition to preventing the
External force that does not prevent
Even when it is applied, the external force is supported by the reaction force of the locking means.
By doing so, the displacement can be prevented. Therefore, after that, when positioning the grip segment with the erector with respect to the existing segment , the grip segment
Direction, no misalignment around any axis.
In addition, the positioning can always be performed stably.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a section of an erector installation portion of a shield machine in which an erector according to an embodiment of the present invention is installed as viewed from a tail side of a shield. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view of a main portion of FIG. 1 showing a main portion of FIG. 1, and FIG. In FIGS. 1 to 4, parts denoted by the same reference numerals as those in FIGS. 5 to 7 represent the same parts as those in FIGS.

The erector of the shield machine according to the embodiment of the present invention is similar to the erector of the prior art in that it has a "segment holding mechanism 3".
1 and a segment guide 30 that abuts and grips the grip segment 10 by the mechanism 31 and a segment guide positioning mechanism 20 that corrects and positions the position and orientation of the segment guide 30. When joining the gripping segment 10 held in contact with the existing segment, the segment guide positioning mechanism 20 can correct and position the position and attitude of the gripping segment 10 so as to match the position and attitude of the existing segment 11. Existing segment 11
In order to measure the relative positional relationship of the gripping segment 10 with respect to the existing segment 11, a sensor for measuring the distance from the existing segment 11
A pair is provided symmetrically at a fixed interval in the axial direction. "

The erector of the shield machine according to this embodiment is as follows.
In the erector 2 having such a configuration, a steadying mechanism 60 is provided so that the positional relationship between the grip segment 10 gripped by the segment guide 30 and the sensor can be kept constant. The structure of the steadying mechanism 60 will be described with reference to FIGS. 1 to 4.
60a is a steady rest jack composed of a cylinder and a piston, and is extended and contracted. 60b is a lever-like fixing tool for fixing the gripping segment 10 held in contact with the segment guide 30 to the segment guide 30, and 60c is a fixing tool of this fixing tool 60b. Rubber members 60d, 60e and 60f are provided at the ends and abut against one of the walls of the bolt mounting groove 10a formed in the gripping segment 10, and 60d, 60f are pins for supporting the shaft. The steady rest jack 60a has a segment on the cylinder side end.
The pin 60f is attached to the guide frame 30b of the
The position at which the cylinder side end is pivotally supported by the pin 60f is a lower position relatively close to the arc-shaped outer peripheral surface of the guide frame 30b. Fixture 60
b, one end is pivotally supported by a pin 60e on the piston rod side end of the steady rest jack 60a, and the other end is a segment.
The steady rest jack 60a and the guide frame 30 are supported by pins 60d on the guide frame 30b of the guide 30.
b . The position at which the other end of the fixture 60b is pivotally supported by the pin 60d is higher than the position at which the cylinder-side end is pivotally supported by the pin 60f. The steady rest jack 60a and the fixture 60b are connected as described above to form a link mechanism, and when the steady rest jack 60a is shortened, it is provided at the end of the fixture 60b as shown by a solid line in FIG. The rubber material 60c is pulled up slightly above the arc-shaped outer peripheral surface of the guide frame 30b, and when the steady rest jack 60a is extended, as shown by a chain line in FIG. 3, the rubber material 60c is pushed down from the arc-shaped outer peripheral surface. Being segment guide 3
It enters into the bolt mounting groove 10a of the gripping segment 10 gripped at 0 and is pressed against the wall surface thereof. As described above, the link mechanism including the steady rest jack 60a and the fixing tool 60b is provided with the rubber member 60c serving as the locking means.
A holding segment fixing mechanism for fixing the holding segment 10 to the segment guide 30 by being abutted and locked to the wall surface of FIG. Such a fixing mechanism of the gripping segment,
As shown in FIG. 1, it is desirable to provide the pair in symmetrical manner with respect to the segment holding mechanism 31. As the rubber material 60c, a material that enhances the frictional force between the bolt mounting groove 10a and the wall surface when the rubber material 60c is in contact with the wall surface is selected.

Since the erector of this embodiment has the above-described configuration, the grip segment 10 is
After the gripping operation of the gripping segment 10 to be held in contact with the guide 30 is completed, when the steady rest jack 60a in the state of the solid line in FIG. 3 is extended, the fixing tool 60b is moved to the pin 60d with the extension of the steady rest jack 60a. Swings clockwise around the center of the fixing member 60b and the rubber material 6 provided at the end of the fixture 60b.
0c is the grip segment 10 which is pushed down and gripped by the segment guide 30 as shown by the chain line in FIG.
Into the bolt mounting groove 10a, and is pressed against the wall surface. As a result, the rubber material 60c as the locking means
On the wall surface of the bolt mounting groove 10a of the grip segment 10.
The gripping segment 10 is fixedly fixed to the segment guide 30 by abutting and locking. Therefore, grip segment 1
0 position shift to the segment guide 30
In addition to being able to prevent by the frictional force due to the contact of the
Depending on the frictional force, the displacement of the gripping segment 10 may be reduced.
If an external force that cannot be prevented is applied to the grip segment 10
The external force is applied to the rubber member 60c at the end of the fixture 60b.
It is possible to prevent the displacement by supporting with the reaction force of
it can. Therefore, when positioning the gripping segment 10 with respect to the existing segment 11 by the erector 2 thereafter, the gripping segment 10 does not shift in any axial direction and around any axis, and the sensor and the sensor do not move. Is always kept constant without changing during the positioning operation. As described above, according to the present embodiment, the above-mentioned problem in the conventional technique can be solved, and when the gripper segment 10 is positioned with respect to the existing segment 11 by the erector 2 , the positioning is always performed stably. The shield excavator can be obtained.

[0016]

As is apparent from the above description, the present invention relates to a structure described in the claims, and more particularly, to a structure in which "the locking means abuts and locks on the wall surface of the bolt mounting groove of the gripping segment. The grip segment fixing mechanism for fixing the grip segment to the segment guide is attached to the segment guide '', so when positioning the grip segment with the erector with respect to the existing segment, the positioning is always stable. An erector of a shield machine that can be performed can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a section of an erector installation portion of a shield machine in which an erector according to an embodiment of the present invention is installed, as viewed from a tail side of a shield.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of the main part of FIG.

FIG. 4 is a view in the direction of arrow B in FIG.

FIG. 5 is a cross-sectional view of a section of an erector installation portion of a shield machine in which an erector according to the related art is installed as viewed from a tail side of a shield.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is an enlarged sectional view of a segment gripping mechanism in the erector of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Elector 4 Electring 5 Arm 7 Hanging beam 8 Pressing jack 10 Holding segment 10a Bolt mounting groove 10b Grout screw hole 11 Existing segment 20 Segment guide positioning mechanism 30 Segment guide 30a Hanging part 30b Guide frame 31 Segment holding mechanism 31a Holding Frame 31b, 31c Gripping jack 31d Sliding body 31g Screw shaft 31i Drive motor 60a Steady-stop jack 60b Fixture 60c Rubber material 60d, 60e, 60f Pin

Continuing on the front page (72) Inventor Naokazu Oda 650 Kandamachi, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. (72) Inventor Fumiya Takano 650, Kunitachi-cho, Tsuchiura-shi, Ibaraki Pref. Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) References JP-A-3-25197 (JP, A) JP-A-59-173499 (JP, A) (Japanese) Shokai 58-106498 (JP, U) Shokai 60-58698 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/40

Claims (1)

(57) [Claims] 1. A segment guide which has a mechanism for gripping a gripping segment and thereby abuts and grips the gripping segment, and a segment guide positioning mechanism which corrects and positions the position and orientation of the segment guide.
Oite the Elekta of the shield machine has, it has attached a gripping segment locking mechanism for locking the gripping segments abutting engagement thereby locked locking means on the wall of the bolt mounting grooves of the gripping segments in the segment guide segment guide Electa for shield machine.