JP4562636B2 - Shape retention device - Google Patents

Description

  The present invention relates to a shape holding device for securing the shape of a segment after completion of segment assembly, and more particularly to a shape holding device that can cope with a change in the thickness of a segment.

  Generally, in a tunnel excavated by a shield machine, segments are assembled along the inner periphery of the tunnel, and a backing material is injected into the back side of the segment to fix the segment. Until the backing material solidifies, The shape must be retained.

  Therefore, the shield machine is provided with a shape holding device that presses and holds the inner peripheral surface of the segment assembled along the inner periphery of the tunnel.

  The shape holding device is formed so as to be able to expand and contract up and down, and presses and holds the upper and lower inner peripheral surfaces of the segments assembled on the inner peripheral surface of the tunnel.

Japanese Patent Laid-Open No. 11-210397 No. 7-47516

  By the way, in recent years, a construction method for excavating a tunnel wall constructed with a shield machine, such as when a tunnel is branched, has begun to be developed. When using this method, it is necessary to make the thickness of the segment thicker than other sections in order to secure the tunnel strength at the time of excavation, but in the conventional method, it is not possible to change the thickness of the segment in the same tunnel. In addition, there is a problem that there is no shape holding device that can cope with the change in the thickness of the segment. That is, when the thickness of the segment is changed, the outer diameter of the tunnel wall is determined by the inner diameter of the shield frame. Therefore, the inner diameter of the tunnel wall is changed, and a tunnel wall having a smaller inner diameter and a tunnel wall having a larger inner diameter are combined. If the tunnel wall has a large inner-diameter difference, the upper and lower expansion / contraction jacks of the shape-holding device have a long stroke, and the inner diameter of the tunnel wall is reduced. However, when the jack is extended to the maximum with a large tunnel wall, excessive lateral force acts on the rod of the jack, and there is a problem that the jack does not have.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide a shape holding device that can ensure the shape of the segment even when the thickness of the segment changes and can cope with the change in the thickness of the segment.

  In order to solve the above problems, the present invention provides a jack for expanding and contracting the upper and lower frames between the upper and lower frames extending in the vertical direction, and when the upper and lower frames are positioned on the segment after completion of the segment assembly, In the shape holding device for securing the shape of the segment, when the thickness of the segment after assembly is changed, the length of either or both of the upper and lower frames is changed without changing the stroke of the jack. Height adjusting means for variably adjusting the height is provided on the upper and lower frames.

  The height adjusting means includes a telescopic part that telescopically expands and contracts vertically, a contraction side fixing member that fixes the expansion part with a contracted length, and an expansion side fixing member that fixes the expansion part with a stretched length. It is good to have.

  The contraction-side fixing member may be formed of a pair of flanges that are provided on the outer peripheral portion and the inner peripheral portion of the expansion / contraction portion and are fastened to overlap each other when the expansion / contraction portion is contracted.

  The extension side fixing member may be a panel member provided between the flanges when the flanges are separated from each other by extending the stretchable part.

  It is good to provide the panel temporary member which is attached to one side of the said flange, and fixes the said panel member facing a flange when the said expansion-contraction part has retracted.

  The panel temporary member may be configured such that a surface for fixing the panel member is formed flush with a flange surface of the flange, and the panel member is guided when the panel member is provided between the pair of flanges.

  According to the present invention, the shape of the segment can be secured even if the thickness of the segment changes, and the change in the thickness of the segment can be dealt with.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 5, the shape holding device 1 is configured by providing a jack 4 for expanding and contracting the upper and lower frames 2 and 3 between the upper and lower frames 2 and 3 that extend in the vertical direction. When the upper and lower frames 2, 3 are positioned on the segment 5, the jack 4 is extended to secure the shape of the segment 5 with the upper and lower frames 2, 3. The upper frame 2 is formed extending in the width direction, and has an upper contact portion 8 that is in contact with the upper inner peripheral surface 7 of the tunnel wall 6 formed by a plurality of segments 5, and both ends of the upper contact portion 8. An upper support column 9 that is formed to hang down and is slidably engaged with the lower frame 3, and a rear deck 10 that extends from the rear of the shield frame S and extends inward in the width direction to the upper support column 9. And an inner beam portion 12 mounted so as to be able to run back and forth via a roller 11. The upper contact portion 8 is formed to be curved along the upper inner peripheral surface 7 of the tunnel wall 6 when the thickness of the segment 5 is the smallest, and receives the segment 5 on a wide range of surfaces. .

  The lower frame 3 includes a lower contact portion 14 that is in contact with the lower inner peripheral surface 13 of the tunnel wall 6, and is detachably provided at both ends of the lower contact portion 14. 9 and a lower support portion 15 that is slidably engaged with the upper and lower portions. The lower contact portion 14 is formed so as to be curved along the lower inner peripheral surface 13 of the tunnel wall 6 when the thickness of the segment 5 is the smallest, similarly to the upper contact portion 8. It comes to be supported by the surface.

  The jack 4 is formed to have a stroke and a rod diameter substantially the same as those of a conventional jack (not shown), and has an optimum strength necessary and sufficient for a load received from the segment 5. That is, the jack 4 expands to support the segment 5 when the thickness of the segment 5 is thinnest, or retracts to retract the inner beam portion 12 on the rear deck 10 and the rod diameter. The stroke is not changed so as to absorb the difference in thickness of the segment 5.

  In addition, when the thickness of the segment 5 after assembly is changed, the upper frame 2 does not change the stroke of the jack 4, and the height adjusting means 16 that variably adjusts the length of the upper frame 2 in the height direction. Is provided in advance.

  As shown in FIGS. 2, 3 and 4, the height adjusting means 16 includes a telescopic portion 17 which is formed on the upper frame 2 and telescopically expands and contracts vertically, and a retractable portion which fixes the telescopic portion 17 with a contracted length. A side fixing member 18 and an extension side fixing member 19 that fixes the stretchable portion 17 with an extended length are provided. Specifically, the expansion / contraction portion 17 is formed by dividing the upper support column portion 9 in the vertical direction and providing an inner peripheral portion 20 that is slidably fitted into one of the cut ends in the other cut end. As shown in FIGS. 2 and 3, the contraction-side fixing member 18 is provided on the inner peripheral portion 20 of the telescopic portion 17 and the outer peripheral portion 21 into which the inner peripheral portion 20 is fitted, and is vertically moved when the telescopic portion 17 is contracted. It consists of a pair of flanges 22 and 23 that are fastened together. The flanges 22 and 23 are each formed in a rectangular shape in plan view. The extension-side fixing member 19 includes panel members 24 and 25 provided between the flanges 22 and 23 when the expansion / contraction part 17 is extended and the flanges 22 and 23 are separated from each other. The panel members 24 and 25 are made of a steel material formed in a rectangular plate shape, and when provided between the flanges 22 and 23, the panel members 24 and 25 are erected and fastened to the four sides of the flanges 22 and 23, respectively. The panel members 24 and 25 are set to have the same height as the difference in thickness between the upper and lower segments 5, that is, the difference in inner diameter of the tunnel wall 6, and when provided between the flanges 22 and 23, the upper frame 2 is tunneled. The inner diameter difference of the wall 6 is extended. Further, the panel members 24 and 25 are fixed so as to face the flanges 22 and 23 via the panel temporary members 26 and 27 when the expansion / contraction part 17 is retracted.

  The panel temporary members 26 and 27 are provided at the outer peripheral end of the upper flange 22 so as to extend in the extending direction of the flange 22, and are formed flush with the flange surface (not shown) of the flange 22 and the panel member 24. , 25 has a fixing surface 29 for fixing the upper end surface 28 thereof. Specifically, the panel temporary members 26 and 27 are formed such that the upper end surfaces 28 of the panel members 24 and 25 are brought into contact with the fixed surface 29 and fastened to the panel members 24 and 25 with bolts or the like. The fixing surface 29 is configured to guide the panel members 24, 25 toward the flanges 22, 23 when the panel members 24, 25 are provided between the pair of flanges 22, 23. Further, when the telescopic portion 17 is retracted, the panel members 24 and 25 are fastened to the respective portions of the upper frame 2 via the mounting plates 30 and 31 at the lower ends thereof, and are integrated with the retracted upper frame 2. ing.

  As shown in FIGS. 8 and 10, the height adjusting means 16 includes a receiving base 32 for supporting the upper frame 2 on the upper side of the expansion / contraction part 17 and a flange 22 that is vertically spaced when the expansion / contraction part 17 is expanded / contracted. , 23, when the panel members 24, 25 are provided, a feeding device 33 is provided for feeding the panel members 24, 25 between the flanges 22, 23.

  The cradle 32 is configured to support the upper contact portion 8 when the upper frame 2 is lowered while being placed on the rear deck 10 immediately below the upper contact portion 8. By fixing the height of the upper flange 22, the panel members 24 and 25 can be removed from between the flanges 22 and 23, and the relative movement (proximity separation) of the upper and lower flanges 22 and 23 by the jack 4 is enabled. . In particular, when the upper frame 2 is placed on the rear deck 10 by retracting the jack 4 while receiving the upper abutting portion 8 and supporting it by the gantry 32 as described above, the cradle 32 has the upper and lower flanges 22, The height is set so that 23 is separated by the same length as the height of the panel members 24 and 25.

  The feeding device 33 includes a base 34 that is detachably attached to the lower flange 23, and a guide rod 35 that is slidably provided on the base 34 along the extending direction of the flange 23 and guides the panel members 24 and 25. , And extends in parallel with the guide rod 35 and screwed into the base 34, and is provided with a pushing bolt 36 for pushing the panel members 24, 25 toward the flanges 22, 23. The base portion 34 includes an extension portion 37 that is attached to the outer peripheral end of the lower flange 23 so as to extend in the extending direction of the flange 23, and a standing portion 38 that is provided upright at the extension end of the extension portion 37. The extending portion 38 is formed flush with the flange surface of the flange 23 and has a guide surface 39 for sliding the lower end surfaces 41 of the panel members 24 and 25. A guide rod 35 is slidably inserted into the standing portion 38, and a push bolt 36 is threaded through the horizontal direction.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 7 and FIG. 8, when the segment 5 is shifted from a thick work area to a thin work area, the shape holding device 1 is run on the rear deck 10, and the shape holding device 1 is moved to the thickness of the segment 5. After moving to a thin work area, the upper frame 2 is raised by extending the jack 4. At this time, since the stroke of the jack 4 is not determined so as to correspond to the difference in thickness of the segment 5, the upper frame 2 does not reach the segment 5. In this state, the receiving base 32 is placed on the rear deck 10 directly below the upper frame 2 and the fastening between the flanges 22 and 23 is released, so that the jack 4 is retracted. Thereby, the lower flange 23 can be lowered while maintaining the height of the upper flange 22, and the flanges 22, 23 can be separated from each other as shown in FIG. When the upper frame 2 is placed on the rear deck 10, a temporary scaffold 40 for performing work around the telescopic portion 17 is installed on the rear deck 10, and as shown in FIG. 10, the lower flange 23 and the panel member The feeding device 33 is attached to 24 and 25. At this time, since the upper frame 2 is placed on the rear deck 10, the upper and lower flanges 22 and 23 are accurately separated by the same length as the height of the panel members 24 and 25. Further, since the panel members 24 and 25 are attached so as to be suspended from the lower surfaces (fixed surfaces 29) of the panel temporary members 26 and 27 extending from the upper flange 22, the upper and lower flanges 22 and 23 are separated from each other. It will be located in the same attitude | position as the attitude | position at the time of attachment outside.

  Thereafter, the fixing of the panel members 24 and 25 to the panel temporary members 26 and 27 is released, and the panel members 24 and 25 are sent to the gap between the flanges 22 and 23 by the feeding device 33. Specifically, after attaching the base 34 of the feeding device 33 to the outer peripheral end of the lower flange 23 with a bolt or the like and attaching one end of the guide rod 35 to the panel members 24 and 25 by a method such as welding or screwing, The fastening between the panel temporary members 26 and 27 and the panel members 24 and 25 is released. The panel members 24 and 25 are released from fastening because the lower end surface 41 is in contact with the guide surface 39 of the feeding device 33 and the upper end surface 28 is in contact with the fixed surface 29 of the panel temporary members 26 and 27. But it doesn't move. When the panel members 24 and 25 are sent between the flanges 22 and 23, the push bolt 36 is rotated to push the panel members 24 and 25 into the flanges 22 and 23 side. The panel members 24, 25 pushed by the push bolt 36 are guided by the panel temporary members 26, 27 and the feeding device 33 at the upper and lower end faces 28, 41 and at the base 34 of the feeding device 33 via the guide rod 35. Therefore, it is stably fed to the gap between the flanges 22 and 23 without being inclined.

  Thereafter, the upper and lower flanges 22 and 23 and the respective panel members 24 and 25 are fastened with bolts or the like, and the panel members 24 and 25 adjacent to each other at the four corners of the flanges 22 and 23 are fastened with bolts or the like. 17 is fixed in the extended state. Thereby, as shown in FIG. 10, the height of the upper frame 2 can be raised. When the extension work of the extendable part 17 is completed in this way, the cradle 32 is removed. Further, when the thickness of the segment 5 is reduced, the curvature of the inner peripheral surface of the segment 5 is also increased and does not match the curvature of the upper contact portion 8 and the lower contact portion 14 of the upper and lower frames 2, 3. As shown in FIG. 6, a taper attachment 43 is attached to the upper surface of the upper contact portion 8 to adjust the curvature of the contact surface of the upper contact portion 8, and the lower surface of the lower contact portion 14 is tapered as shown in FIG. The attachment 43 is attached to adjust the curvature of the contact surface of the lower contact portion 14. Furthermore, the temporary scaffold 40 is removed. Thus, as shown in FIGS. 12 and 6, the segment 5 can be held by extending the jack 4 as usual, and the difference in the thickness of the segment 5 can be accommodated without changing the stroke of the jack 4. Can do.

  The expansion / contraction part 17 is retracted by placing the upper frame 2 on the receiving base 32 in the same manner as described above, and then removing the panel members 24, 25 from the upper and lower flanges 22, 23 and moving them to the outside of the flanges 22, 23. The panel members 24 and 25 are fastened to the panel temporary members 26 and 27, the jack 4 is extended, the upper and lower flanges 22 and 23 are overlapped, and then the upper and lower flanges 22 and 23 are fastened.

  Thus, when the thickness of the segment 5 after the assembly is completed, the height adjusting means 16 for adjusting the length in the height direction of the upper frame 2 without changing the stroke of the jack 4 is previously Since the frame 2 is provided, the shape of the segment 5 can be secured by adjusting the length of the upper frame 2 with the height adjusting means 16 even if the thickness of the segment 5 changes. Without change, it is possible to cope with a change in the thickness of the segment 5.

  The height adjusting means 16 includes a telescopic portion 17 that telescopically expands and contracts vertically, a contraction side fixing member 18 that fixes the telescopic portion 17 with a contracted length, and an expansion side that fixes the stretchable portion 17 with an extended length. Since the fixing member 19 is provided, the length of the upper frame 2 in the height direction can be reliably adjusted to a predetermined length.

  The contraction-side fixing member 18 is composed of a pair of flanges 22 and 23 that are provided on the outer peripheral portion 21 and the inner peripheral portion 20 of the expansion / contraction portion 17 and are fastened to overlap each other when the expansion / contraction portion 17 is contracted. The portion 17 can be securely fixed to the predetermined length with a simple structure.

  The extension-side fixing member 19 is composed of panel members 24 and 25 provided between the flanges 22 and 23 when the extension portions 17 are extended and the flanges 22 and 23 are separated from each other. Can be securely fixed to the length with a simple structure.

  Further, since the panel members 24 and 25 are attached to the upper flange 22 and the panel members 24 and 25 are fixed so as to face the flange 22 when the expansion and contraction portion 17 is retracted, the expansion and contraction portion 17 is expanded and contracted. Thus, it is possible to save the trouble of carrying or collecting the panel members 24, 25 having a weight of 100 to 150 kg to the expansion / contraction part 17, and the expansion / contraction part 17 can be efficiently expanded / contracted.

  The panel temporary members 26, 27 are formed so that a fixing surface 29 for fixing the panel members 24, 25 is flush with the flange surface of the flange 22, and is fixed when the panel members 24, 25 are provided between the pair of flanges 22, 23. Since the panel members 24 and 25 are configured to be guided by the surface 29, the panel members 24 and 25 can be easily moved between the flanges 22 and 23 and the temporary panel position, and the expansion / contraction part 17 can be efficiently performed. Can be expanded and contracted.

  Although the height adjusting means 16 is provided on the upper frame 2, it may be provided on the lower frame 3 or on both the upper frame 2 and the lower frame 3.

  The panel temporary members 26 and 27 are provided on the upper flange 22, but may be provided on the lower flange 23. In this case, a feeding device 33 may be provided on the upper flange 22.

  The cradle 32 supports the upper frame 2 on the upper side of the expansion / contraction part 17. However, when the expansion / contraction part 17 is formed on the lower frame 3, the support base 32 supports the lower frame 3 on the lower side of the expansion / contraction part 17. Good.

  The receiving stand 32 may be a receiving jack (not shown) that expands and contracts vertically. In this case, after releasing the fastening between the flanges 22 and 23, the flanges 22 and 23 can be separated from each other by expanding and contracting the receiving jack.

It is front sectional drawing of the shape holding | maintenance apparatus which shows suitable embodiment of this invention. It is a perspective view of a height adjustment means. It is a front view of a height adjustment means. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is a side view of FIG. It is front sectional drawing of a shape holding device when the thickness of a segment becomes thin. It is an important section expanded front sectional view of a shape maintenance device when the thickness of a segment is thick. It is a principal part expanded front sectional view of the shape maintenance apparatus of the 1st process of adjusting the height of an upper frame with a height adjustment means, when the thickness of a segment becomes thin. It is an important section expanded front sectional view of the shape maintenance device of the 2nd process of adjusting the height of an upper frame with height adjustment means. It is a principal part expanded front sectional view of the shape holding | maintenance apparatus of the 3rd process which adjusts the height of an upper frame with a height adjustment means. It is principal part expanded front sectional drawing of the shape holding | maintenance apparatus of the 4th process which adjusts the height of an upper frame with a height adjustment means. It is a principal part expanded front sectional view of the shape holding | maintenance apparatus holding a segment with the upper frame which adjusted height.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shape holding apparatus 2 Upper frame 3 Lower frame 4 Jack 5 Segment 16 Height adjustment means 17 Telescopic part 18 Retraction side fixing member 19 Extension side fixing member 20 Inner peripheral part 21 Outer peripheral part 22 Flange (upper flange)
23 Flange (lower flange)
24 Panel member 25 Panel member 26 Panel temporary member 27 Panel temporary member 29 Fixed surface

Claims (6)

  A jack that expands and contracts the upper and lower frames is provided between the upper and lower frames that extend in the vertical direction, and when the upper and lower frames are positioned on the segment after completion of segment assembly, the jack is extended to maintain the shape of the segments in the upper and lower frames. In the apparatus, when the thickness of the segment after assembly is completed, the height adjusting means for variably adjusting the length in the height direction of one or both of the upper and lower frames without changing the stroke of the jack, A shape holding device provided on the upper and lower frames.   The height adjusting means includes a telescopic part that telescopically expands and contracts vertically, a contraction side fixing member that fixes the expansion part with a contracted length, and an expansion side fixing member that fixes the expansion part with a length that is extended. The shape holding apparatus of Claim 1 provided.   3. The shape holding device according to claim 2, wherein the contraction-side fixing member includes a pair of flanges that are provided on an outer peripheral portion and an inner peripheral portion of the expansion / contraction portion and are overlapped and fastened when the expansion / contraction portion is contracted.   The shape holding device according to claim 3, wherein the extension side fixing member includes a panel member provided between the flanges when the flanges are separated from each other by extending the expansion / contraction part.   The shape holding device according to any one of claims 1 to 4, further comprising a panel temporary member attached to one of the flanges and configured to fix the panel member facing the flange when the expansion / contraction portion is retracted.   The panel temporary member is formed so that a surface for fixing the panel member is flush with a flange surface of the flange, and the panel member is guided when the panel member is provided between the pair of flanges. The shape holding device as described.

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