JP2018035607A - Segment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost segment structure that enables prompt connection.SOLUTION: A segment structure constitutes a shield tunnel lining. A male joint and a female joint are provided on a segment joint surface of the segment. The female joint is constituted by providing a claw on surfaces opposite each other at a tip of two plate bodies located opposite each other. The claws resume to an original state because of elasticity even when the plate body is deformed. The male joint is a plate body inserted between the two plate bodies of the female joint and engaged, and has an engaging window opened thereon into which the claw of the female joint may be inserted. The engaging window forms a space wider than a width of the female joint in a tunnel axis direction, and enables the female joint to move in the tunnel axis direction inside the engaging window. The segment joint surface includes a male joint storage formed along the male joint, and a female joint storage formed along the female joint. The male joint storage includes an insertion space and an engaging space that continue in the direction of movement of the female joint.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a segment structure used in a shield tunnel.

The shield tunnel is constructed by taking the reaction force from the segment ring assembled behind the steel shell of the shield machine and pushing out the shield machine with a shield jack.
In this case, since the segment ring is constructed by assembling a plurality of arc-shaped segments, it is required to be an inexpensive segment and easy to assemble.

Various conventional joints for smooth inner surface segments have a proven record.
However, the conventional one has the following problems.
(1) Since the segment joint and the ring joint have completely different structures and separate members are manufactured in this way, they are expensive.
(2) Furthermore, since the structure of any joint is complicated, the joint member itself is expensive.
(3) The coupling force between the rings of the ring joint is small.
(4) As a result of the small coupling force between the ring joints, there is a possibility that the K segment is pushed out from the segment ring at a large depth and under a high water pressure.

  In order to solve such problems, the segment structure described in Patent Document 1 below was invented.

JP2015-137525A

  The structure of the segment described in the above Patent Document 1 includes a male joint and a female joint, the female joint is composed of opposing claw plates, and the male joint is an engagement window into which the female joint claw plate can be inserted. Is an opening.

However, the segment structure described in Patent Document 1 has a gap between the female joint and the wall of the male joint storage chamber because the female joint is elastically fitted to the male joint.
For this reason, if a force in the bending direction acts on the joint, the claw plate may come off the engagement window, and the fitting may be released, resulting in no bending resistance (FIG. 8).

1st invention of this application which solves the above subjects is the structure of the segment which comprises the lining of a shield tunnel, Comprising: The segment joint surface of the said segment is equipped with a male joint and a female joint, The said female joint Is configured by providing claws on the opposing surfaces of the ends of two opposing plate bodies, and both the nails are configured to return to their original state by elasticity even when the plate bodies are deformed, The joint is a plate that is inserted and engaged between the two plates of the female joint, and is configured by opening an engagement window into which the claw of the female joint can be inserted, and the engagement window Forms a space wider than the width of the female joint in the tunnel axial direction, and is configured so that the female joint can move in the tunnel axial direction inside the engagement window. Along the male joint storage chamber formed along the female joint The female joint storage chamber has an insertion space and a locking space that are continuous in the moving direction of the female joint, and the upper and lower intervals of the insertion space are opposed to each other. When the male joint is inserted between the female joints, the claw of the female joint is in contact with the male joint, and the female joint can be opened up and down, and the vertical space of the locking space. Provides a segment structure characterized in that it has substantially the same thickness as the combined thickness of the two plate bodies of the female joints facing each other and the male joint inserted between the female joints.
The second invention of the present application is the segment structure of the first invention, wherein the locking space is at least half the length of the female joint claw engaged with the male joint from the depth direction end surface of the male joint storage chamber. A segment structure is provided that is characterized by being formed.
According to a third aspect of the present invention, in the segment structure according to the second aspect, the upper surface of the female joint above the female joint to be engaged with the male joint and the lower surface of the female joint below the male joint storage chamber A convex piece is provided at the position of the inlet, and the upper and lower intervals of the position corresponding to the convex piece in the locking space are the upper surface of the convex piece of the upper female joint and the lower surface of the convex piece of the lower female joint. The segment structure is characterized in that it is substantially the same as the interval.
According to a fourth invention of the present application, in the segment structure according to any one of the first to third inventions, a chamfer is formed at the tip of the female joint facing the gap between the claws of the female joint in the tip direction of the female joint. The segment structure is characterized by being formed as an expanding slope.
According to a fifth aspect of the present invention, in the segment structure according to any one of the first to third aspects, a distal end portion of the male joint on the inlet side of the male joint storage chamber is formed in a wedge shape and narrows in a distal direction of the male joint. A segment structure is provided, characterized in that it is formed as a bevel.
According to a sixth invention of the present application, in the segment structure according to any one of the first to fifth inventions, a male jack joint and a male ring joint housing the male ring joint are accommodated on a shield jack pressure surface of the ring joint surface of the segment. And a female ring joint corresponding to the male ring joint and a female ring joint storage chamber for housing the female ring joint are provided on a surface opposite to the shield jack pressure surface of the segment. Claws are provided at the front ends of the plate members, and both the claws are configured to return to their original state by elasticity even when the plate body is deformed. The male ring joint is the two of the female ring joints. A plate body that is inserted and engaged between the plate bodies, and is configured by opening an engagement window into which the claw of the female ring joint can be inserted, The upper and lower intervals of the joint storage chamber are the intervals at which the female ring joint can open up and down when the male ring joint is in contact with the male ring joint when the male ring joint is inserted between the female ring joints facing each other. A segment structure is provided, characterized in that
According to a seventh aspect of the present invention, in the segment structure of the sixth aspect, the tip of the female ring joint facing each other is chamfered to form an inclined surface in which the gap between the claws of the female ring joint extends in the distal direction of the female ring joint. A segment structure is provided.
The eighth invention of the present application is the segment structure of the sixth invention or the seventh invention, wherein the male ring joint has a wedge-shaped tip on the inlet side of the male ring joint storage chamber, and is formed as a slope narrowing in the tip direction of the male ring joint. A segment structure is provided.

Since the segment structure of the present invention is as described above, the following effects can be obtained.
(1) Bending acts on the female joint by making the upper and lower intervals of the locking space of the male joint storage chamber substantially the same as the combined thickness of the two plates of the female joint and the plate of the male joint. The nail plate will not come out when
(2) Since both the male joint and the female joint have simple structures, the joint itself is inexpensive and the operation is accurate.
(3) Since the segments are joined only by these joints, the inner surface of the shield tunnel is smooth and the secondary lining can be omitted.

Explanatory drawing of the Example of the structure of the segment of this invention. Explanatory drawing of the fitting process of a segment coupling. Explanatory drawing of the relationship between the nail | claw of a segment and an engagement window. Explanatory drawing of the fitting of the segment coupling by a slide. Explanatory drawing of the depth of a locking space. Explanatory drawing of a ring coupling. Explanatory drawing of the relationship between a coupling and a shield jack. Explanatory drawing of the Example of the conventional coupling.

Hereinafter, preferred embodiments of the segment structure of the present invention will be described in detail with reference to the drawings.
A joint between segments is referred to as a “segment joint”, and a joint between segment rings is referred to as a “ring joint”.
The joint surface between the segments is referred to as a “segment joint surface”, and the joint surface between the segment rings is referred to as a “ring joint surface”.

[1] Segment structure.
<1> The method for joining segments of the present invention.
The segment of the present invention has a structure in which segments are joined in two stages.
First, a new segment is slid in the circumferential direction to be fitted with a segment joint of a previously installed segment.
Then, in the next step, the segment is slid in the tunnel axis direction and joined to the segment ring that has been completed in advance.
For this purpose, the segment is provided with a segment joint on the segment joint surface and a ring joint on the ring joint surface.
The segment joint is composed of a male joint 1 and a female joint 2, and the ring joint is composed of a male ring joint 3 and a female ring joint 4 (FIG. 1).

<2> Female joint.
The female joint 2 of the segment joint is constituted by an opposing plate body 21 and a claw 22 provided at the tip (FIG. 2).
The female joint 2 is disposed inside the female joint storage chamber 5 formed in the segment joint surface, and its tip projects from the segment joint surface.
The nail | claw 22 is located facing the front-end | tip of the plate 21, and is a joint which returns to an original shape by elasticity, even if the plate 21 deform | transforms.
For this purpose, when the tip of the male joint 1 is inserted between the claws 22 of the female joint 2, the gap between the claws 22 is expanded, and when pushed further, the claws of the female joint 2 are inserted into the engagement window 11 that opens to the male joint 1. 22 falls and the fitting is completed (FIG. 2).

<3> Male joint.
The male joint 1 of the segment joint is a plate that is inserted between the plate 21 of the female joint 2 and the claws 22 located at the tip of the plate 21.
The male joint 1 is formed in the segment joint surface, and is disposed inside the male joint storage chamber 6 formed along the upper and lower surfaces of the male joint 1.
An engagement window 11 into which a claw 22 of the female joint 2 can be inserted and fitted is opened in a part of the male joint 1 located in the male joint storage chamber 6 (FIG. 2). Further, as shown in FIG. 2, an interval may be provided between the end portion of the male joint 1 and the end surface in the depth direction of the male joint storage chamber 6, and this may be used as the engagement window 11.

<4> The width of the engagement window.
The width of the engagement window 11 into which the claws 22 of the female joint 2 are fitted in the segment joint is formed wider than the width of the claws 22 of the female joint 2 by at least the distance L that the female joint 2 moves in the tunnel axis direction. Yes (Figure 3).
The “width” in this case is the length in the horizontal direction when the arc-shaped segment is laid down with the arc facing down.
As shown in FIG. 3, the width of the engagement window 11 is configured to be wider by at least the distance L than the width of the claw 22, so that both of them are in the axial direction of the tunnel even after the claw 22 is fitted into the engagement window 11. Slide is possible.

<5> Male joint storage room.
The male joint storage chamber 6 has an insertion space 61 with a large vertical spacing and a locking space 62 with a small vertical spacing (FIG. 4).
Here, the “up and down” direction is a vertical direction in a state in which the segment is laid with its arc on the bottom.
The insertion space 61 and the locking space 62 are continuous in the moving direction of the female joint 2.

<6> Insertion space interval.
When the distal end of the male joint 1 is inserted between the claws 22 of the female joint 2 facing each other, the insertion space 61 is expanded at an interval at which the female joint 2 opens up and down. Configure.
By comprising in this way, the nail | claw 22 of the female joint 2 fully opens up and down, and the male joint 1 and the female joint 2 can be easily fitted.

<7> Spacing space spacing.
When the claw 22 of the female joint 2 is fitted into the engagement window 11 at the interval of the insertion space 61 described above, a gap is generated between the female joint 2 and the wall surface of the insertion space 61.
The segment is slid in the axial direction of the tunnel after the segment joint is fitted.
For this reason, the engagement space 62 is formed in the male joint storage chamber 6 in the sliding direction (FIG. 4).
The upper and lower intervals of the locking space 62 are configured to be substantially the same as the combined thickness of the two plate bodies 21 of the female joint 2 and the male joint 1 accommodated between the female joints 2.
With this configuration, when the segment is slid, the female joint 2 is inserted and arranged between the wall surface of the locking space 62 and the male joint 1, and a bending force acts on the joint. However, the female joint 2 is not deformed and the claw 22 does not come off from the engagement window 11.
The locking space 62 is configured such that the surface on the side of the insertion space 61 is an inclined surface 621 in order to make it easy to slide and insert the female joint 2 (FIG. 4).

<8> Depth of the locking space.
The locking space 62 prevents the claw 22 of the female joint 2 from coming off from the engagement window 11.
For this reason, if the latching space 62 is at least about one half of the length of the claw 22 of the female joint 2 from the end surface in the depth direction of the male joint storage chamber 6, the claw 22 comes off from the engagement window 11. Can be prevented (FIG. 5a).
At this time, a convex piece 23 is provided at the entrance of the male joint storage chamber 6 on the upper surface of the upper female joint 2 and the lower surface of the lower female joint 2, and the convex piece 23 of the male joint storage chamber 6 is provided. The convex part 63 is formed in the corresponding position, and the vertical distance of the male joint storage chamber 6 is defined as the distance between the upper surface of the convex piece 23 of the upper female joint 2 and the lower surface of the convex piece 23 of the lower female joint 2 It may be substantially the same (FIG. 5b). The convex piece 23 and the convex part 63 have shear resistance in the radial direction of the tunnel.

<9> Chamfering.
In order to make it easy to insert the male joint 1 between the claws 22 of the female joint 2, the surface of the claw 22 at the tip of the female joint 2 is configured as an inclined surface 24 having a wide interval (FIG. 2).
By making the interval between the ends of the opposing claws 22 larger than the height of the male joint 1 by the slope 24, the male joint 1 can be easily inserted between the claws 22, and along the slope 24 by the male joint 1. By expanding the female joint 2, the fitting of both is facilitated, and finally the claw 22 is fitted into the engagement window 11 of the male joint 1.
You may comprise not the female joint 2 but the front-end | tip of the male joint 1 as a wedge shape, and it is comprised as the slope 12 narrowed in a front-end | tip direction. By making the height of the male joint 1 narrower than the distance between the ends of the opposing claws 22 by the slope 12, the male joint 1 can be easily inserted between the claws 22, and the female joint 2 spreads along the slope 12. The both can be easily fitted.

<10> Ring joint.
The ring joint includes a male ring joint 3 and a female ring joint 4.
The female ring joint 4 has the same shape as the female joint 2, and is configured by an opposing plate body 41 and a claw 42 provided at the tip thereof (FIG. 6).
The female ring joint 3 is arranged inside a female joint storage chamber 7 formed in the ring joint surface, and the tip is projected from the ring joint surface (FIG. 1).
The claw 42 is located opposite to the tip of the plate 41 and is a joint that returns to its original shape by elasticity even when the plate 41 is deformed.
For this purpose, when the tip of the male ring joint 3 is inserted between the claws 42 of the female ring joint 4, the gap between the claws 42 is expanded, and when pushed further, the claws of the female ring joint 4 are inserted into the engagement window 31 opened to the male ring joint 3. 42 falls and the fitting is completed.

<11> Male ring joint.
The male ring joint 3 is a plate body that is inserted between the plate body 41 of the female ring joint 4 and the claw 42 positioned at the tip of the plate body 41.
The male ring joint 3 is disposed inside a male ring joint storage chamber 8 formed in the ring joint surface (FIG. 1).
An engagement window 31 into which the claw 42 of the female ring joint 4 can be inserted and fitted is opened in a part of the male ring joint 3 (FIG. 5). An interval may be provided between the end portion of the male ring joint 3 and the end surface in the depth direction of the male ring joint storage chamber 8, and this may be used as the engagement window 31.
The width of the engagement window 31 may be a width that allows the claw 42 of the female ring joint 4 to be fitted.

<12> Chamfering of a ring joint.
Like the segment joint, the ring joint has a structure in which the surface of the claw 42 at the front end of the female ring joint 4 is formed as an inclined surface 43 with a wide interval so that the male ring joint 3 can be easily inserted between the claws 42 of the female ring joint 4. (FIG. 6a).
The slope 43 makes the gap between the ends of the opposing claws 42 larger than the height of the male ring joint 3 so that the male ring joint 3 can be easily inserted between the claws 42, and along the slope 43 by the male ring joint 3. By expanding the female ring joint 4, the fitting of both is facilitated, and finally the claw 42 is fitted into the engagement window 31 of the male ring joint 3.
Instead of the female ring joint 4, the tip of the male ring joint 3 may be wedge-shaped and configured as an inclined surface 32 that narrows in the direction of the tip (FIG. 6b).
By making the height of the male ring joint 3 narrower than the distance between the opposite ends of the claws 42 by the slope 32, the male ring joint 3 can be easily inserted between the claws 42, and the female ring joint 4 spreads along the slope 32. The both can be easily fitted.

<13> Relationship with shield jack.
The shield machine is a structure that advances by pressurizing the ring joint surface of the segment.
Therefore, it is inconvenient if the male ring joint 3 or the female ring joint 4 protrudes from the pressing surface of the segment.
For this purpose, the male ring joint 3 is installed on the pressure surface in a state of being housed in the male ring joint housing chamber 8, and the female ring joint 4 is projected from the female ring joint housing chamber 7 on the opposite side. (Fig. 7)

<14> Installation position of the joint.
The male joint 1 and female joint 2 described above are disposed on the segment joint surface of the segment, and the male ring joint 3 and female ring joint 4 described above are disposed on the ring joint surface.
In that case, it is a matter of course that one segment and the male joint 1 and the female joint 2 and the male ring joint 3 and the female ring joint 4 of the adjacent segments can be fitted to each other.

[2] Assembly of segments.
Next, the case where the segment of this invention is assembled is demonstrated.

<1> Segment joint fitting.
The new segment is slid in the circumferential direction in the steel shell of the shield machine, and the segment joint surface is brought into contact with the segment joint surface of the existing segment.
As described above, when the distal end of the male joint 1 is inserted between the claws 22 of the opposing female joint 2, the insertion space 61 of the male joint storage chamber 6 is pushed and expanded in contact with the male joint 1. Since the female joint 2 is configured to be opened and closed vertically, the male joint 1 can be inserted by widening the gap between the claws 22 of the female joint 2.
In this way, the female joint 2 of the existing segment and the male joint 1 of the new segment are fitted, and at the same time, the male joint 1 of the existing segment and the female joint 2 of the new segment are fitted.

<2> Fitting of ring joint.
Next, the segment is slid in the axial direction of the tunnel.
The width of the engagement window 11 of the male joint 1 on the segment joint surface is formed wider than the width of the female joint 2 by the slide distance L.
Therefore, even after the segments are joined at the segment joint, the female joint 2 can slide within the engagement window 11 of the male joint 1 by a certain distance L in the axial direction of the tunnel. By moving the distance L, the female joint 2 moves to the locking space 62.
Further, by sliding in the axial direction of the tunnel by this distance L, the female ring joint 4 protruding from the ring joint surface can be fitted to the male ring joint 3 on the end face of the preceding segment ring.
In this way, the new segment is first joined by fitting a segment joint and then by fitting a ring joint.
At this time, the upper and lower intervals of the locking space 62 of the male joint storage chamber 6 where the segment joint is located are obtained by combining the two plate bodies 21 of the female joint 2 and the male joint 1 stored between the female joints 2. The female joint 2 is not deformed and the claw 22 is not detached from the engagement window 11.

1: Male joint 11: Engagement window 12: Slope 2: Female joint 21: Plate body 22: Claw 23: Convex piece 24: Slope 3: Male ring joint 31: Engagement window 32: Slope 4: Female ring joint 41: Plate body 42: Claw 43: Slope 5: Female joint storage room 6: Male joint storage room 61: Insertion space 62: Locking space 621: Slope 63: Convex part 7: Female ring joint storage room 8: Male ring joint storage room

Claims (8)

The structure of the segments that make up the lining of the shield tunnel,
The segment joint surface of the segment comprises a male joint and a female joint,
The female joint is configured by providing claws on the opposing surfaces of the tips of two opposing plate bodies, and both the claws are configured to return to their original state due to elasticity even when the plate body is deformed. ,
The male joint is a plate body that is inserted and engaged between the two plate bodies of the female joint, and is configured by opening an engagement window into which the claw of the female joint can be inserted,
The engagement window forms a space wider than the width of the female joint in the tunnel axial direction, and the female joint is configured to be movable in the tunnel axial direction inside the engagement window.
The segment joint surface has a male joint storage chamber formed along the male joint and a female joint storage chamber formed along the female joint,
The male joint storage chamber has an insertion space and a locking space that are continuous in the moving direction of the female joint,
The vertical space of the insertion space is an interval at which when the male joint is inserted between the female joints facing each other, the claws of the female joint are in contact with the male joint and the female joint can be opened up and down. And
The upper and lower intervals of the locking space are substantially the same as the combined thickness of the two plate bodies of the opposing female joint and the male joint inserted between the female joints,
Segment structure. In the structure of the segment of claim 1,
The locking space is formed from a depth direction end face of the male joint storage chamber to a length of at least half of a claw of the female joint engaged with the male joint.
Segment structure. The segment structure according to claim 2,
On the upper surface of the female joint above the female joint that engages with the male joint, and on the lower surface of the female joint below, a convex piece is provided at the position of the inlet of the male joint storage chamber,
The vertical distance of the position corresponding to the convex piece of the locking space is substantially the same as the distance between the upper surface of the convex piece of the upper female joint and the lower surface of the convex piece of the lower female joint. Features
Segment structure. In the structure of the segment according to any one of claims 1 to 3,
Chamfering the front end portion of the female joint facing, and forming as a slope in which the gap of the claw of the female joint widens in the front end direction of the female joint,
Segment structure. In the structure of the segment according to any one of claims 1 to 3,
The male joint storage chamber entrance side tip of the male joint has a wedge shape, and is formed as a slope narrowing in the tip direction of the male joint,
Segment structure. In the structure of the segment according to any one of claims 1 to 5,
The shield jack pressure surface of the ring joint surface of the segment is provided with a male ring joint and a male ring joint storage chamber for storing the male ring joint,
A surface opposite to the shield jack pressure surface of the segment is provided with a female ring joint corresponding to the male ring joint, and a female ring joint storage chamber for storing the female ring joint,
The female ring joint is configured by providing a claw at the tip of two opposing plate bodies, and the both claws are configured to return to their original state by elasticity even when the plate body is deformed,
The male ring joint is a plate body that is inserted and engaged between the two plate bodies of the female ring joint, and is configured by opening an engagement window into which the claw of the female ring joint can be inserted,
When the male ring joint is inserted between the female ring joints facing each other, the claw of the female ring joint comes into contact with the male ring joint and the female ring joint opens up and down. It is characterized by being a possible interval,
Segment structure. In the structure of the segment of claim 6,
The tip of the female ring joint facing the chamfer is chamfered to form an inclined surface in which the gap between the claws of the female ring joint is widened in the distal direction of the female ring joint.
Segment structure. In the structure of the segment according to claim 6 or 7,
The male ring joint has a wedge-shaped tip on the inlet side of the male ring joint storage chamber, and is formed as a slope narrowing in the tip direction of the male ring joint,
Segment structure.

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