JP2583741B2 - Segment fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment fastening device in shield construction, and more particularly to a method for assembling a plurality of divided segments into a segment ring in a tunnel excavated by a shield machine. The present invention relates to a segment fastening device for automatically fastening seams of adjacent segments.

[0002]

2. Description of the Related Art A tunnel peripheral wall excavated by a shield machine is used for water stoppage and reinforcement as the excavation progresses.
At the rear of the shield machine, a plurality of divided segments are assembled to form a segment ring.

[0003] The main structure of a segment assembling apparatus for assembling this segment is that a hollow revolving wheel is rotatably arranged along the inner peripheral wall of a shield skin plate at the rear part of a shield excavator. A hanging beam is movably mounted in the direction, a segment holding table for holding the divided segment is provided on the hanging beam, and a holding portion is provided on the segment holding table, and the segment is held by the holding portion. Then, it is transported to the assembly position by the interlocking operation of the turning wheel and the suspension beam and assembled. Then, in assembling the segments, in order to fasten the joints of the adjacent segments, the segment holding table is equipped with a plurality of segment fastening devices corresponding to each fastening location around the segment.

Conventionally, as this kind of segment fastening device, a fastening method using bolts and nuts has been generally used, but fastening holes provided in the fastening fittings on the segment side over the adjacent segments. There has also been proposed a fastening device for driving (inserting) a dedicated wedge joint (joint) into the joint for fastening. In the fastening using the wedge joint, the segments are approached to each other by a wedge action by driving the wedge joint into the fastening hole, and the fastening force is increased in proportion to the insertion depth of the wedge joint. (As this prior art, there is, for example, Japanese Utility Model Application Laid-Open No. 2-26699.)

[0005]

As described above, in a segment fastening device in which segments are fastened by driving a dedicated wedge joint into a fastening hole provided in the segment, the reaction force when the wedge joint is driven into the fastening hole is reduced. In the case of receiving on the fastening device side, the reaction force passes through the inside of the fastening device and extends to the segment holding table, and the segment holding table receives a load from all the fastening devices equipped on the segment holding table, At each fastening point, the separation distance between the segment holding table and the segment may be slightly changed, and the driving condition of the wedge joint at each fastening point may be different.

Therefore, when driving a wedge joint into the fastening hole,
When the lower end portions of the pair of joint holding hooks provided in the fastening device are engaged with the opening portion of the segment to receive the reaction force, the reaction force at the time of driving the wedge joint is dispersed to each fastening portion. Therefore, the load on the segment holding table can be reduced.

However, in actual assembly of segments,
There is an error in the assembling accuracy of the segments, and a step may occur at the joint of the segments to be fastened.

When the wedge joint is driven in a state where there is a step in the joint portion of the segment to be fastened, the operating axis of the fastening jack mechanism of the fastening device is fixed. Locks into the opening of the fastening hole,
The other joint holding hook is in a floating state, and the wedge joint is driven while only one joint holding hook is effective. Further, a part of the reaction force is transmitted to the segment gripper through the inside of the fastening device.

In other words, unless the seam portion of the segment to be fastened does not have a step, an accurate locking relationship between both (a pair of) coupling holding hooks of the fastening device and the fastening hole opening on the segment side can be expected. However, there is a possibility that the reaction force may not be received evenly by the joint holding hooks. Further, transmitting a part of the reaction force to the fastening device or the segment holding table is not preferable in terms of structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned point, and regardless of the presence or absence of a step at a joint portion of a segment to be fastened when assembling the segment, both joint holding hooks are always connected to a fastening hole opening portion. To catch the reaction force,
An object of the present invention is to provide a segment fastening device in which a load on equipment other than a fastening jack mechanism for driving a wedge joint is minimized.

[0011]

According to a first aspect of the present invention, there is provided a shield excavator having:
A segment grip for providing a swing wheel that rotates along the inner peripheral wall of the shield skin plate, mounting a suspension beam on the swing wheel so as to be movable in the radial direction of the swing wheel, and gripping the divided segment on the suspension beam. In the segment assembling apparatus provided with a base, an outer case is mounted on the segment holding base corresponding to each fastening position around the segment, and a lifting body is interposed in the outer case and moves up and down together with the lifting body. An inner case is arranged, a wedge joint is clamped at a closed position, and a pair of joint clamping hooks to be engaged with a fastening hole provided in a segment at an open position are arranged on the inner case. A fastening jack mechanism is provided for opening and closing the hook for opening and closing and for driving the wedge joint into the fastening hole. The lifting and lowering body supports the inner case so that the inner case can be tilted and displaced, and a spring is provided between the lifting and lowering body and the inner case. A segment fastening device, characterized in that the HaiSo a centering mechanism for holding the inner case to the position of normal below.

A second configuration is the same as the first configuration, except that pins are provided on front and rear side walls of the inner case, and the pins are supported by horizontally long support holes provided in the elevating body. A pressing member biased by a spring is disposed in a rearward direction, and the pressing member is configured to come into contact with a lifting / lowering body surface from a gap formed between the left and right side walls of the inner case and the lifting / lowering body.

A third configuration is the same as the second configuration,
A spring accommodating hole is provided on the left and right side walls of the inner case, a pressing member urged by a spring is projected from the spring accommodating hole, and a locking edge provided at a base of the pressing member is engaged with an opening of the spring accommodating hole. The protrusion length of the pressing member is regulated by the above.

A fourth configuration is the same as the first configuration,
A pair of joint holding hooks are pivotally attached to the lower end of the inner case so as to be able to open and close opposingly, and a spring is interposed between the upper part of the hook and the inner case to urge the joint holding hook in the closing direction. Is provided with a locking projection for locking the opening portion of the segment.

In a fifth configuration, the fastening jack mechanism in the first configuration is provided, and a cylinder device is provided in the inner case.
The cylinder device is characterized in that a piston rod is protruded downward from the inner case, and a pusher is provided at the rod end to move up and down between a pair of joint holding hooks.

In a sixth configuration, the lifting mechanism in the first configuration is provided with an arm rod extending from the lifting body to the outside of the outer case.
The arm rod is screwed into the feed screw, the feed screw is connected to the motor via the interlocking mechanism, and a reaction force spring that urges the feed screw in the pulling direction is interposed between the feed screw and the outer case. The lifting body and the inner case are held at the raised position together with the feed screw by a reaction spring.

[0017]

In the above construction, when the segment is gripped by the segment gripper and set at a predetermined assembly position, and the segment fastening device is operated to drive a wedge joint into the fastening hole of the segment, a pair of joint holding hooks is used. Is locked at the opening of the fastening hole.

According to the first configuration of the present invention, however, there is a step in the joint between the segments to be fastened, and if the lower end of one hook is first engaged with the opening of the fastening hole, The inner case is tilted or displaced with respect to the elevating body by the centering mechanism with the locking portion as the center of rotation, and the lower end of the other hook is locked in the opening of the fastening hole.

In this way, the lower ends of both hooks are locked in the opening of the fastening hole, and the reaction force when driving the wedge joint is equally received.

In the second configuration, when the inner case is tilted or displaced with respect to the elevating body, the pins provided in the inner case move through the horizontally long support holes provided in the elevating body, and the left and right sides of the inner case are moved. The pressing member arranged rearward on the side wall changes its protruding length under the bias of the spring to perform the centering action. When the driving force of the wedge joint is completed and the reaction force disappears, the inner case is returned to the normal position by making the protruding lengths of the pressing members substantially equal under the bias of the spring.

In the third configuration, in the centering action in which the inner case is tilted or displaced with respect to the lifting / lowering body, the pressing member which protrudes from the surface of the lifting / lowering body by maximizing the protruding length with respect to the inner case is provided by a wedge joint. When the driving is completed and the inner case returns to the normal position, the inner case re-contacts the elevating body surface and participates in the returning operation of the inner case. Until the pressing member lifted from the lifting / lowering body surface comes into contact with the lifting / lowering body surface again, the spring force for urging the pressing member does not participate in the return operation of the inner case (not involved). Is quickly restored.

In the fourth configuration, the pair of joint holding hooks pivotally attached to the lower end of the inner case open and close opposingly about the pivot axis, and in the closed position, are securely connected to the wedge joint under the bias of the spring. Sandwich. In the open position, the lower ends of both hooks are widely opened, and the projections provided on the outer surface of the lower ends of the hooks are securely locked to the opening of the fastening hole.

In the fifth configuration, the pusher which moves up and down between the pair of joint holding hooks opens the joint holding hook to open the wedge joint, and then drives the wedge joint into the fastening hole. Is surely driven.

In the sixth configuration, the lowering movement of the elevating body and the inner case due to the rotation of the motor is stopped when the lower end of the hook comes into contact with the opening of the fastening hole, and the wedge joint is driven by the operation of the fastening jack mechanism. At this stage, the lifting body and the inner case are pulled up together with the feed screw by the reaction force spring, and the lower end of the hook is locked to the opening of the fastening hole. Also, at this stage, the lower ends of both hooks are securely locked to the opening of the fastening hole by the centering action.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a rear view of a shield machine equipped with a segment fastening device using a wedge joint.

In the drawing, reference numeral 1 denotes a segment assembling apparatus provided at a rear portion of a shield excavating machine 2. The basic configuration of the segment assembling apparatus 1 is a swivel provided so as to be able to swivel along an inner peripheral wall of a shield skin plate 2. A wheel 3, a portal-shaped hanging beam 4 mounted on the rotating wheel 3 so as to be movable in the radial direction, and a segment holding table 5 arranged on the hanging beam 4, the segment holding table 5 Part 6
It has.

The segment holding table 5 is formed in a plate shape having a size which is curved on the inner surface of the segment S to be held at substantially the same curvature and covers substantially the entire segment S. The segment S gripped by the segment gripper 5 is carried in from the rear of the tunnel using a bogie or hoist (not shown), and is temporarily placed near the segment assembling apparatus 1 and moved while being positioned below the segment gripper 5. Then, it is gripped by the gripper 6, moved to the desired assembling position of the inner peripheral wall of the tunnel by the interlocking operation of the swivel wheel 3 and the suspension beam 4, etc., assembled into the existing segment and assembled into a ring shape. In assembling the segment S, in order to fasten the joints of the adjacent segments, the segment holding table 5 is provided with a plurality of segment fastening devices 7 corresponding to each fastening location around the segment.

FIG. 2 is a perspective view of a main part of the segment fastening device with a part removed, and FIG. 3 is a sectional view of the main part of the segment fastening device during driving of the wedge joint.

The segment fastening device 7 has an outer case 8 mounted on a segment holding table 5 and an elevating body
An inner case 10 that moves up and down together with the elevating body 9 with the intermediary 9 interposed therebetween is provided.

A pair of joint holding hooks 11 and 12 are pivotally attached to the lower end of the inner case 10 so as to be able to open and close opposingly. Nipping pieces 11a and 12a for holding the upper end of the wedge joint 13 from both sides are protruded from the inside of the lower end of the hook, and the locking projections 11b and 12b to be engaged with a fastening hole opening described later on the outer surface of the lower end of the hook are removed. It protrudes in the direction.

On both sides of the upper end of the wedge joint 13, there are provided locking portions 14 for locking the holding pieces 11a, 12a of the joint holding hooks 11, 12 for holding the wedge joint 13. Further, a fastening hole 15 into which the wedge joint 13 is driven is provided in the fastening metal fitting on the segment side so as to straddle the adjacent segment S, and the locking projections 11b, 12b of the joint holding hooks 11, 12 are provided in the opening of the fastening hole. Are formed so that the concave portion 16 which is moved in and out sideways and locked is opened inward.

As the shape of the fastening hole 15 provided in the wedge joint 13 and the segment S in the above-described embodiment, for example, various shapes such as those having an H-shaped cross section can be applied.

Upper part of the joint holding hooks 11 and 12 and inner case
Both hooks 11 and 12 are urged in the closing direction with a spring 17 interposed between them.

Reference numeral 18 denotes a fastening jack mechanism provided in the inner case 10, and the fastening jack mechanism 18 is a joint holding hook.
11 and 12 are opened and closed, and a wedge joint 13 released from being clamped by the coupling clamping hooks 11 and 12 is driven into the fastening hole 15. A cylinder device 19 is provided in the inner case 10. A piston rod 20 is protruded below the inner case 10, and a pusher 21 is provided at the end of the rod to move up and down between the joint holding hooks 11 and 12.

The outer surface of the pusher 21 is provided with a joint holding hook.
A closed position holding surface 21a for holding the first and second members 11 and 12 in the closed position and an open position holding surface 21b for holding the first and second members in the open position are formed through tapered surfaces. Further, on the inner surfaces of the joint holding hooks 11 and 12 corresponding to the closed position holding surface 21a and the open position holding surface 21b of the pusher 21, a pressing piece 22 that slides on both surfaces is provided. With the pusher 21 raised and the pusher 21 raised, the pressing piece 22 faces the closed position holding surface 21a, the hooks 11 and 12 take the closed position, the cylinder device 19 extends and the pusher 21 moves the hooks 11 , 12 and the pressing piece 22 moves onto the open position holding surface 21b to open the hooks 11, 12.

Reference numeral 23 denotes a centering mechanism of the inner case 10 disposed between the elevating body 9 and the inner case 10, and the centering mechanism 23 aligns the central axes of the outer case 8 and the inner case 10 in a normal state.
Also, the center axis of the outer case 8 and the inner case 10 can be displaced without the vertical tilt of the inner case 10 with respect to the elevating body 9 and the tilting body 9 under the bias of the spring. Pins 24 are provided on the front and rear side walls near the lower end.
24 is supported by a horizontally long support hole 25 provided in the elevating body 9, a gap 26 is formed between the left and right side walls of the inner case 10 and the elevating body 9, and a plurality of spring accommodation holes 27 are provided on each of the left and right side walls of the inner case 10. ,
A pressing member 28 is protruded from the spring receiving hole 27, and the pressing member 28 is urged by a spring 29 stored in the spring receiving hole 27 to contact the corresponding elevating body 9 from the gap 26.
In addition, a locking edge 30 is provided at the base of the pressing member 28, which is locked in the opening of the spring receiving hole 27 to prevent the spring member from being pulled out from the spring receiving hole 27, and the pressing member 28 from the inner case 10. The length (height) of the protrusion is regulated.

Numeral 31 denotes an elevating mechanism for the elevating body 9. The elevating mechanism 31 moves the inner case 10 together with the elevating body 9 with respect to the outer case 8, and extends from the elevating body 9 to the outside of the outer case 8. An arm rod 32 is provided, and the arm rod 32 is screwed to a feed screw 33 supported near the outer case 8, and the feed screw 33 is connected to a motor 35 via an interlocking mechanism 34 such as a gear.
Also, a spring case 36 is attached to the outer case 8 corresponding to the feed screw 33.
A reaction force spring 37 for urging the feed screw 33 in the pulling direction is interposed between the spring case 36 and the upper end of the feed screw 33. In the normal state, the reaction screw 37 Along with 33, the elevating body 9 and the inner case 10 are raised at an appropriate height (length) and held at the raised position.

In the above configuration, the segment S divided below the segment holding table 5 is carried in and is
6 Hold it with and move it to the assembling position by the usual method.
The basic procedure for fastening the joint of S 1, that is, the procedure when there is no step in the joint of the segment S to be fastened will be described with reference to FIGS. 4 to 9.

FIG. 4 The cylinder device 19 of the fastening jack mechanism 18 is contracted and the pusher 21 is lifted up to be in the standby position, and the elevating mechanism 9 of the elevating body 9 causes the elevating body 9 and the outer case 8 to move relative to the outer case 8. Lifting body 9 and inner case
10 is up and in the up position. At this position, the pair of joint holding hooks 11 and 12 are in the closed position under the bias of the spring 17 and hold the wedge joint 13 above the fastening hole 15 (the segment holding base 5).
Inside).

FIG. 5 The rotation of the motor 35 of the elevating mechanism 31 lowers the inner case 10 together with the elevating body 9 via the feed screw 33, and the lower ends of the joint clamping hooks 11, 12 abut against the opening of the fastening hole. Stop descent by the way. Here, the locking projections 11a and 12a of the joint clamping hooks 11 and 12 correspond to the recesses in the opening of the fastening hole.
16, the wedge joint 13 is inserted into the fastening hole 15 while being held between the joint holding hooks 11 and 12.

FIG. 6 The cylinder device 19 of the fastening jack mechanism 18 is extended and the driving of the wedge joint 13 is started. Here, the pusher 21 descends, and the pressing pieces 22 of the joint holding hooks 11, 12 move onto the open position holding surface 21b of the pusher 21, and the joint holding hooks 11, 12 open against the spring 17. Then, the clamping of the wedge joint 13 is released. The lower end of the hook is wide open so that the locking projections 11b and 12b enter the recess 16.

FIG. 7 The elevating member 9 and the inner case 10 are slightly pulled up together with the feed screw 33 by the reaction force spring 37, and the locking projections 11b and 12b are locked in the concave portion 16. Then, the strong operating thrust of the cylinder device 19 is transmitted to the wedge joint 13 via the pusher 21 and the wedge joint 13 is driven.

FIG. 8 After the driving of the wedge joint 13 is completed, the operation in the reverse order to the above is performed, that is, the time when the cylinder device 19 is contracted and the pusher 21 rises, and the pusher 21 leaves the driven wedge joint 13. Then, the elevating body 9 and the inner case 10 are slightly lowered together with the feed screw 33 by the reaction force spring 37, and the locking relationship between the locking projections 11b, 12b and the concave portion 16 is released. The pusher 21 moves from the open position holding surface 21b to the closed position holding surface 21a, and under the urging of the spring 17, the joint holding hooks 11 and 12 close and the locking projections 11b and
12b comes out of the recess 16 and the joint holding hooks 11, 12 return to the closed position.

FIG. 9 The motor 35 of the elevating mechanism 31 is rotated (reversely rotated) to rotate the elevating member 9 and the inner case 10 through the feed screw 33.
To return to the original ascending position. Thus, the segment fastening operation is completed. Where the fastening jack mechanism
18 also returns to the original standby position, and the wedge joint 13 to be driven next time is held between the joint holding hooks 11 and 12 to be in a standby state.

Next, in the case where there is a step at the joint portion of the adjacent segments, the driving procedure of the wedge joint is shown in FIG.
This will be described with reference to FIG.

In this case as well, there is no change in the procedures up to those shown in FIGS. 4 to 6 in the above-described basic procedure, and thus duplicated description will be omitted. In addition, in order to simplify the following description, in FIGS. 10 to 11, the right segment corresponding to the joint holding hook 11 is a lower segment S1, and the left segment corresponding to the joint holding hook 12 is a higher segment. S2.

The pusher 21 is lowered by the extension movement of the cylinder device 19 of the fastening jack mechanism 18, and the driving of the wedge joint 13 is started, and the joint holding hooks 11, 12 are opened against the spring 17 (see FIG. 2). When the holding member 11 and the inner case 10 are lifted by the reaction force spring 37 after the holding projections 11b and 12b on the outer surface of the lower end of the hook enter the recess 16 and the wedge joint 13 is released, as shown in FIG. As shown, the right joint holding hook 11
Only the locking projection 11b of the left side hooks into the recess 16 of the lower segment S1, and the locking projection 12
b is within the concave portion 16 of the higher segment S2, and creates a play α (gap).

The reaction force generated when the pusher 21 continues to descend and drives the wedge joint 13 is temporarily received by the locking portion between the locking projection 11 and the concave portion 16 of the lower segment S1. The centering mechanism 23 causes the inner case 10 to perform a centering action.
That is, part of the one-sided reaction force is transmitted to the inner case 10,
The locking projection 11 and the lower segment S1 which are in the locking relationship first
The inner case 10 tilts and shifts in the gap 26 with respect to the elevating body 9 with the locking portion with the recess 16 of
As shown in FIG. 11, the locking projection 12b of the left joint holding hook 12 is locked in the recess 16 of the higher segment S2.

Thereafter, the reaction force when driving the wedge joint 13 is equally received by both the locking portions, and the wedge joint 13
The strong operating thrust of the cylinder device 19 is transmitted through the pusher 21 to be firmly driven into the fastening hole 15.

When the driving force of the wedge joint 13 is completed and the reaction force disappears, the inner case 10 is aligned with the outer case 8 by the spring 29 for urging the pressing members 28 constituting the centering mechanism 23. After returning to the position, the centering action is canceled.

The elevating body 9 is moved by the centering action of the inner case 10.
The pressing member 28 rising from the surface comes into contact with the surface of the elevating body 9 while the inner case 10 is returning to the normal position. Until the pressing member 28 lifted from the lifting body 9 surface comes into contact with the lifting body 9 surface again, the spring force of the lifting pressing member 28 does not hinder the return operation of the inner case 10, so that the inner case 10 To the normal position.

Thereafter, the basic procedure described above, that is,
8 and 9, the joint holding hooks 11, 12 are returned to the closed position, the lifting member 9 and the inner case 10 are returned to the original raised position, and the segment fastening operation is completed.

[0054]

As described above, according to the present invention, when a segment divided by a segment assembling device is set at a predetermined assembling position of an existing segment, the segment fastening device connects the segment to an adjacent segment. The segment is fastened by driving a wedge joint into the fastening hole provided straddling, and has the following effects.

According to the first aspect, when the wedge joint is clamped by the pair of joint clamping hooks, the lower ends of both hooks are locked to the opening of the fastening hole of the segment, and the wedge joint is driven by the locking portion. The wedge joint is driven while uniformly receiving the reaction force of the above, the force load on the devices other than the inner case and the fastening jack mechanism can be reduced, and the driving can be performed with high reliability.

According to the second aspect of the invention, the effect of the first aspect of the invention is exhibited, and when the wedge joint is driven, if there is a step at the joint of the adjacent segments, the inner case is raised and lowered by the centering mechanism. It tilts and displaces in the gap formed between the body and the lower end of both the joint holding hooks to engage with the opening of the fastening hole, and when the driving of the wedge joint is completed, the inner case returns to the normal position. Since it is automatically restored, there is no complicated part in handling.

According to the third aspect, the effects of the first and second aspects described above are exhibited, and the length of the pressing member that projects from the inner case under the bias of the spring is regulated. Even if the inner case is greatly tilted or displaced in the gap formed between the inner case and the elevating body, some of the pressing members may be separated from the elevating body surface (lift) by maximizing the protruding length thereof. Since the case re-contacts the elevating body surface while the case is returning to the normal position, the spring force in the direction that hinders the return movement of the inner case decreases during this time until the inner case returns to the normal position. Quick return.

According to the fourth aspect, the effects of the first aspect described above are exhibited, and a pair of joint holding hooks are pivotally connected to the lower end of the inner case so as to be openable and closable, and are urged in the closing direction by a spring. Therefore, it operates smoothly by reducing the friction in the hook operation. In addition, the joint holding hook opens,
Its lower end is wide open to ensure engagement with the opening of the fastening hole.

According to the fifth aspect, the effect of the first aspect described above is exhibited, and the wedge joint is opened by opening the joint holding hook by lowering the pusher constituting the fastening jack mechanism. Since the wedge joint is driven into the fastening hole, the configuration of the fastening jack mechanism can be simplified.

According to the sixth aspect of the invention, the effect of the first aspect described above is exhibited, and the feed screw is urged in the pulling-up direction by the reaction force spring. Since the inner case is slightly pulled up and held at the raised position, the engagement holding hook is detached from the fastening hole and released from the fastening hole precisely in conjunction with the operation of the fastening jack mechanism.

[Brief description of the drawings]

FIG. 1 is a rear view of a shield machine equipped with a segment fastening device using a wedge joint.

FIG. 2 is a perspective view of a main part in which a part of the segment fastening device is omitted.

FIG. 3 is a sectional view of a main part of the segment fastening device during driving of the wedge joint.

FIG. 4 is an operation explanatory view of the segment fastening device.

FIG. 5 is an operation explanatory view of the segment fastening device.

FIG. 6 is a diagram illustrating the operation of the segment fastening device.

FIG. 7 is an operation explanatory view of the segment fastening device.

FIG. 8 is an operation explanatory view of the segment fastening device.

FIG. 9 is an operation explanatory view of the segment fastening device.

FIG. 10 is an operation explanatory view of the segment fastening device.

FIG. 11 is an operation explanatory view of the segment fastening device.

[Explanation of symbols]

 5… Segment holder 8… Outer case 9… Elevator 10… Inner case 11… Hook for holding the joint 12… Hook for holding the joint 18… Screw jack mechanism 23… Alignment mechanism

Claims (6)

(57) [Claims] 1. A swing wheel rotating along an inner peripheral wall of a shield skin plate is provided at a rear portion of a shield machine, and a suspension beam is mounted on the swing wheel so as to be movable in a radial direction of the swing wheel.
In the segment assembling apparatus, the hanging beam is provided with a segment gripper for gripping the divided segments. An outer case is mounted on the segment gripper corresponding to each fastening position around the segment. And an inner case that moves up and down with the elevating body
The inner case is provided with a pair of joint holding hooks for holding the wedge joint at the closed position and engaging with the opening of the segment provided at the segment at the open position. A fastening jack mechanism for driving a joint into a fastening hole is provided, and the elevating body supports the inner case so that the inner case can be tilted and displaced, and the inner case is normally placed between the elevating body and the inner case under the bias of a spring. A segment fastening device provided with a centering mechanism for holding at a position. 2. Pins are provided on front and rear side walls of an inner case, the pins are supported by horizontally long support holes provided on an elevating body, and pressing members urged by springs are disposed on left and right side walls of the inner case in a rearward direction. And
2. The segment fastening device according to claim 1, wherein the pressing member is brought into contact with the lifting body surface from a gap formed between the left and right side walls of the inner case and the lifting body to form a centering mechanism. 3. A spring accommodating hole is provided in the left and right side walls of the inner case, a pressing member urged by a spring is projected from the spring accommodating hole, and a locking edge provided at a base of the pressing member is opened by the opening of the spring accommodating hole. 3. The segment assembling device according to claim 2, wherein the projection length of the pressing member is restricted by being locked to the portion. 4. A pair of joint holding hooks are pivotally connected to the lower end of the inner case so as to be openable and closable opposingly, and a spring is interposed between the upper portion of the hook and the inner case to urge the joint holding hook in a closing direction. 2. The segment fastening device according to claim 1, wherein a locking projection is provided on an outer surface of a lower end of the hook to be locked to a mouth of the fastening hole. 5. A fastening jack mechanism comprising a cylinder device provided in an inner case, a piston rod of the cylinder device protruding downward from the inner case, and a pusher moving up and down between a pair of joint holding hooks at the rod end. The segment fastening device according to claim 1, wherein: 6. An arm rod extending from the elevating body to the outside of the outer case is provided, the arm rod is screwed into a feed screw, and the feed screw is connected to a motor via an interlocking mechanism to provide an elevating mechanism for the elevating body. A reaction force spring that urges the feed screw in the pulling direction is interposed between the feed screw and the outer case, and the lifting member and the inner case are held in the raised position together with the feed screw by the reaction force spring in a normal state. The segment fastening device according to claim 1, wherein