JP5115613B2 - Segment shape holding device and segment shape holding method using the shape holding device - Google Patents

Description

  The present invention relates to a shape retaining device for a segment that is covered with excavation in a shield method, and a segment shape retaining method using the shape retaining device.

  In general, in the shield method that constructs a tunnel in the ground, when assembling the segment in the tail part of the shield machine, the outer periphery of the constructed segment is filled with backing material, but a predetermined strength can be obtained in a short time. For this reason, the segment constructed immediately before is subject to deformation due to earth pressure or dead weight from the natural ground, which often hinders connection with the latest segment being assembled. For this purpose, a shape holding device for holding the shape of the segment applied immediately before is used.

  For example, Patent Document 1 discloses a support deck projecting rearward from the shield machine main body, a pair of left and right expansion jacks that are installed on both upper and lower sides of the support deck so as to be movable in the tunnel direction, and extend in the vertical direction. FIG. 2 shows a shape holding device including an arc-shaped upper expansion beam and a lower expansion beam that are attached to the upper end portion and the lower end portion of the expansion jack, respectively, along arcuate cross-sectional shapes. This shape holding device supports the vertical load acting on the segment due to earth pressure or natural weight from the natural ground by extending the expansion jack and bringing the upper expansion beam and the lower expansion beam into contact with the inner surface of the segment, This prevents deformation of the segment.

Also, for example, in Patent Document 2, a pair of left and right lifts that are installed in series in the tunnel direction on the upper and lower sides of the base frame projecting rearward from the shield machine main body and extend in the vertical direction, respectively. A plurality of shape-retaining units composed of jacks, etc., an arc-shaped upper shape retaining frame and a lower shape retaining frame that are attached to the upper end portion and the lower end portion of the lifting jack, respectively, and the rearmost end side The unit is equipped with a unit transfer mechanism that moves the shape-retaining unit located inside the other shape-retaining units to the frontmost position, and each shape-retaining unit holds one ring segment. A shape retaining device is shown. After assembling the latest segment, this shape holding device moves the innermost of the shape retaining units on the rearmost end side through the insides of the remaining plurality of shape retaining units to the foremost end, so that one ring of the latest segment This process is repeated in order to prevent the segment from being deformed.
JP 2002-97899 A JP 2000-328898 A

  However, in the method using the shape holding device described in Patent Document 1, after assembling the latest segment, the pressure of the expansion jack of the shape holding device that holds the segment applied immediately before is released to expand the jack. The shape holding device was moved to the latest segment position, and the expansion jack was extended again to keep the shape of the latest segment. Therefore, while the shape holding device is moved from the previous segment to the latest segment, the shape of both segments is not maintained, so the latest segment is deformed by earth pressure from the natural ground and its own weight. There was a problem of end. And even if the shape holding device is installed on the latest deformed segment, it cannot be completely restored to its original shape, and there is a problem in that it hinders the connecting operation of the next newly assembled segment.

  Also, as the shield machine is propelled, if the shape retention device that holds the segment that was installed immediately before is moved to the latest segment in a short time, the backing material filled in the outer periphery of this segment will be in a short time Since the predetermined strength could not be obtained, the shape holding device was removed in a state where it was not completely solidified, and there was a problem that this segment was deformed by earth pressure from the natural ground or its own weight.

  In the method using the shape holding device described in Patent Document 2, in order to install a plurality of shape holding units, the shape holding device occupies most of the space in the tunnel, and transports segments and moves workers. There was a problem that it was difficult. In addition, there is a problem in that a plurality of shape retaining units and a mechanism for allowing other shape retaining units to pass through the shape retaining units are costly and the construction cost increases.

  Therefore, the present invention has been made in view of the conventional problems as described above, and improves the workability of tunnel construction and keeps the latest segment shape in a segment assembled one step before. It is an object of the present invention to provide a segment shape holding device capable of continuing the shape holding effect and a segment shape holding method using the shape holding device.

In order to achieve the above object, a shape holding device of the present invention is a shape holding device for holding the shape of a segment assembled when propelling a shield machine,
One end connected to the tail portion of the shield machine, the support beam and the other end protrudes to the rear of the shield machine,
A pair of extended beams that are detachably connected to the upper portion of the support beam and extend from the support beam to the left and right sides;
Up-and-down expansion and contraction means that can be expanded and contracted in the vertical direction connected to the respective ends of the pair of extension beams ;
Is connected to the upper and lower ends of the upper and lower telescopic unit, with contact with the inner surface of the segment, you anda slider having a slidable sliding body along the inner surface of the segment.

According to the segment shape retaining device of the present invention, the shape retaining device retains the shape of the segment assembled immediately before, and the inner surface of the segment without expanding / contracting the vertical stretching means (releasing the shape retaining device). It is possible to slide forward along and move to the latest segment. Therefore, it is possible to reliably and accurately hold the latest segment shape continuously from the state in which the shape of the segment assembled immediately before is held. In addition, since it is not necessary to extend / contract the jack, change the shape holding device, etc., it is possible to shorten the construction period and reduce the construction cost.
When the latest segment is assembled, it is immediately held, so that it can be lifted and prevented from slipping off due to its own weight in the skin plate.
Further, since the mechanism for moving the shape holding device includes only the sliding portion having the sliding body, it is possible to make the configuration simple and small. Therefore, since the entire shape holding device is configured with a simple mechanism and the shape holding device does not occupy the space in the segment, a work space such as a scaffold for transporting and assembling the segment pieces is secured, and work efficiency is increased. Can be achieved.

In the onset bright, the sliding body is characterized by comprising a rotary member such as a roller.

In the onset bright, the sliding body is made small plate-like sliding material having frictional resistance, characterized in that it is interchangeable.

In the onset bright, the upper and lower telescopic hand stage is provided with a detecting means for detecting the extension contraction amount, characterized by retaining the shape of the segments by extending a predetermined expansion amount.
According to the shape-retaining device of the segments of the present invention, in order to extend the extension of the upper and lower telescopic hand stage set based on the design in an empty segment, it is possible to maintain the shape of a segment exactly.

Shape holding method of a segment of the present invention has one end connected to the tail portion of the shield machine, the support beam and the other end protrudes to the rear of the shield machine, is detachably connected to the top of the support beam, said support A pair of extended beams extending from the beam to the left and right sides, a vertically extending and retracting means connected to the respective ends of the pair of extending beams, and extending and contracting vertically; In the shape holding method of holding the shape of the segment using a shape holding device having a sliding portion having a sliding body that is slidable along the inner surface of the segment
Extending the up-and-down telescopic means, the sliding body of the sliding portion abuts on the inner surface of the segment assembled immediately before, and maintains the shape of the segment assembled immediately before,
Assemble the latest segment inside the shield machine,
The shape holding device also moves forward by sliding the sliding body along the inner surface of the segment assembled immediately before, while maintaining the shape of the segment assembled immediately before without expanding and contracting the vertical expansion / contraction means. And
The shape of the latest segment is maintained at the same time as the sliding body moves to the latest segment.

In the onset bright, the upper and lower telescopic hand stage is characterized by retaining the shape of the segments by extending a predetermined expansion amount.

  According to the shape retaining device for a segment and the shape retaining method using the shape retaining device of the present invention, while improving the workability of tunnel construction and maintaining the shape retaining effect of the segment assembled immediately before, the latest segment It becomes possible to hold | maintain the shape of.

It is a front view of a rectangular shield machine according to the embodiment of the present invention. It is a side sectional view of a rectangular shield machine according to the embodiment of the present invention. It is a front sectional view of the tail part of the shield machine concerning this embodiment . It is a sectional side view of the tail part of the shield machine concerning this embodiment . It is a figure which shows the operating method of the shape holding | maintenance apparatus which concerns on this embodiment . It is a figure which shows the operating method of the shape holding | maintenance apparatus which concerns on this embodiment . It is a figure which shows the operating method of the shape holding | maintenance apparatus which concerns on this embodiment . It is a front sectional view of a tail part of a shield machine in a reference example . It is an A-A 'arrow line view of FIG. It is a front sectional view of the tail part of the shield machine concerning other embodiments of the present invention . It is a sectional side view of the tail part of the shield machine concerning other embodiments of the present invention . It is a diagram showing another method of installing the left and right telescopic means. It is a diagram showing another method of installing the top and bottom elastic means.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a rectangular shield machine according to an embodiment of the present invention , and FIG. 2 is a side sectional view of the rectangular shield machine according to an embodiment of the present invention .

  As shown in FIGS. 1 and 2, the shield machine 1 connects the hood part 3 that excavates the face at the front part in the traveling direction, the tail part 5 that performs lining at the rear part, and the hood part 3 and the tail part 5. A girder part 7 equipped with propulsion equipment and the like is also provided, and a skin plate 9 made of a rectangular cylindrical steel shell is provided for protecting each part described above against a load acting from the outside. Close to the inside of the skin plate 9, shield jacks 11 are provided at equal intervals, and are installed in an annular shape so that a propulsive load acts evenly on the entire circumference of the segment 13.

  The shield machine 1 includes a plurality of rectangular main shields 15 which are arranged in a predetermined combination in the skin plate 9 vertically and horizontally, can be independently propelled, and can be independently driven. . The arrangement of the main shield 15 can be an appropriate combination according to the shape and size of the excavation cross section of the tunnel to be constructed. In the present embodiment, for example, the vertical (vertical) direction × the horizontal (horizontal) direction. = 2 (stage) × 3 (column). Each main shield 15 includes a rectangular shield main body 17 provided in the skin plate 9 so as to be movable back and forth, a slide jack 19 for moving the shield main body 17 forward and backward, and a cutter head provided rotatably on the front side of the shield main body 17. 23, a drive source 25 for driving the cutter head 23, and a power transmission mechanism 27 for transmitting the driving force of the drive source 25 to the cutter head 23. Are configured to be independently drivable.

A segment assembling device 59 for assembling a plurality of pieces of segments 13 is provided inside the tail portion 5, and the segments are sequentially assembled on the inner surface of the tunnel excavated by the segment assembling device 59, thereby constructing an inner wall by the segments. The
A discharge device 57 for discharging the excavated earth and sand is connected to the girder unit 7.

Figure 3 is a front sectional view of the tail portion 5 of the shield machine 1 of this embodiment, FIG. 4 is a side cross-sectional view of the tail portion 5 of the shield machine 1 according to this embodiment.

  The shape holding device 31 for holding the shape of the segment has one end connected to a vertical beam 33 (shown in FIG. 2) installed in the tail part 5 of the shield machine 1 and the other end behind the shield machine 1. A projecting support frame 35, a pair of left and right upper and lower expansion / contraction means 37 attached to the support frame 35 and capable of expanding and contracting in the vertical direction, and swinging forward and backward in the traveling direction of the shield machine 1 at the upper end of each vertical expansion and contraction means 37 A bracket 39 that is freely connected by pin connection, and two sliding portions 43 that are connected to the upper portion of the bracket 39 and that abut against the inner surface of the segment 13 and have a sliding body 41 that can slide along the inner surface. , And two sliding portions 43 connected to the lower end portions of the vertical extending / contracting means 37.

  The support frame 35 includes a cylindrical support beam 45 and an extension beam 47 attached to both sides of the support beam 45 in an arm shape. The support beam 45 and the extension beam 47 are detachably connected. In order to secure the lower part of the support beam 45 as a work space for transporting and assembling the segment pieces, the support beam 45 is attached to the vertical beam 33 in a cantilever manner so as to be slightly above the center of the tunnel.

  The vertical expansion / contraction means 37 includes an outer cylinder 49 whose side surface is connected to one end of the extension beam 47, an inner cylinder 51 that is slidably inserted into the outer cylinder 49, and an inner cylinder 51 that is vertically movable with respect to the outer cylinder 49. And an upper and lower jack 53 for sliding in the direction.

  The upper and lower jacks 53 are provided with detection means for detecting the expansion / contraction amount of the jack, and the extension stops when the predetermined extension amount is reached. In the present embodiment, the length from the upper end of the upper sliding body 41 to the lower end of the lower sliding body 41 with respect to the paper surface of FIG. The extension amount when the jack 53 is extended is the above-described predetermined extension amount.

  The sliding portion 43 has a plurality of sliding bodies 41 and is connected to the upper portion of the bracket 39 and the lower end portion of the outer cylinder 49 by pin coupling. The sliding body 41 is composed of a rotating body such as a roller. In the present embodiment, for example, a resin rotating roller is used. Each sliding portion 43 is arranged so as to contact the inner surface of the segment 13 for one ring.

  The shape of the segment 13 is maintained by extending the upper and lower jacks 53 by a predetermined extension amount, sliding the inner cylinder 51 upward with respect to the outer cylinder 49, and contacting each sliding portion 43 to the inner surface of the segment 13. Do. Here, when the upper and lower jacks 53 are extended by a predetermined extension amount, the length from the upper end portion of the upper sliding body 41 to the lower end portion of the lower sliding body 41 via the upper and lower expansion / contraction means 37 is the design of the segment 13. The inner space becomes empty, and the shape of the segment 13 can be maintained in this state.

  Further, even when the inclination of the shield machine and the installation gradient of the segment 13 are different due to curved construction or the like, when the upper and lower jacks 53 are extended to bring the sliding portion 43 into contact with the inner surface of the segment 13, the sliding portion 43 is The bracket 39 rotates so as to be parallel to the gradient, and the sliding body 41 is prevented from hitting the inner surface of the segment 13.

  When the shield machine 1 is propelled in a state where the upper and lower jacks 53 are extended by a predetermined extension amount and the shape of the segment 13d is maintained, the sliding portion 43 slides along the inner surface of the segment 13 so that the shape holding device 31 becomes the shield machine. When the sliding part 43 moves forward to 1 and moves to the latest segment 13e, the shape of the segment 13e is maintained.

Hereinafter, an operation method of the shape holding device 31 will be described.
5-7 is a figure which shows the operating method of the shape holding | maintenance apparatus 31. FIG.

First, as shown in FIG. 4, the upper and lower jacks 53 of the shape retaining device 31 are extended by a predetermined extension amount, and the two sliding portions 43 arranged on the front and rear sides are respectively attached to the inner surfaces of the existing segments 13c and 13d. The shape of each segment 13 is maintained by contact.
Then, the latest segment 13e is assembled in front of the segment 13 held by the shape holding device 31.

  Next, as shown in FIG. 5, the shield jack 11 is extended using the front end of the latest segment 13 e as a reaction force material, the shield machine 1 is driven, and the tail void is filled with the backing material. Since the shape holding device 31 is pulled by the rear part of the shield machine main body, the slide unit 43 moves forward at the same time as the shield machine. As the shape holding device 31 advances, the sliding portions 43 that have been in contact with the inner surfaces of the segments 13c and 13d are The slider 41 is rotated to move toward the latest segment 13e while maintaining the shape of the segments 13c and 13d.

  As shown in FIG. 6, when the shield jack 11 is further extended and the shield machine 1 and the shape holding device 31 are advanced by one ring, the sliding portion 43 in front of the shape holding device 31 moves to the latest segment 13e. The shape is maintained, and the rear sliding portion 43 moves to the segment 13d constructed one step before and continues to maintain the shape. At this time, since the backing material on the outer peripheral portion of the segment 13c is cured to obtain a predetermined strength, the shape of the segment 13c is not deformed even if the shape holding device is removed.

  Then, as shown in FIG. 7, after the shield machine 1 has been propelled by one ring, the shield jack 11 is contracted and the segment assembly device 59 assembles the segment 13 f again.

  As described above, after assembling the segment 13e, the shield machine 1 is propelled and the shape holding device 31 is also advanced, and the series of operations from the shape of the latest segment 13f and the segment 13e constructed one step before is maintained. By forming a cycle and repeating this cycle a plurality of times, the segment 13 behind the shield machine 1 is constructed and the shape of the segment 13 is maintained.

  Therefore, according to the shape holding device 31 of the present embodiment, along with the propulsion of the shield machine 1, the shape holding device 31 slides forward along the inner surface of the segment 13 while maintaining the shape of the segment 13, It is possible to move to the latest segment 13 and retain the shape of this latest segment 13. Therefore, it is possible to maintain the latest shape of the segment 13 without expanding or contracting the vertical expansion / contraction means 37 (releasing the shape holding device) while maintaining the shape of the segment 13 assembled immediately before. That is, since the work of extending and lowering the upper and lower jacks 53 and the work of changing the shape of the shape holding device 31 are not required, the construction period can be shortened and the construction cost can be reduced.

  Further, even when the inclination of the shield machine 1 and the installation gradient of the segment 13 are different due to curved construction or the like, when the vertical extending / contracting means 37 is extended to bring the sliding portion 43 into contact with the inner surface of the segment 13, the sliding portion 43 becomes segmented. The bracket 39 rotates so as to be parallel to the gradient of 13, and the sliding body 41 can be prevented from hitting the inner surface of the segment 13.

  And in order to expand | extend the expansion | extension amount of the vertical expansion-contraction means 37 set based on the design inner space of the segment 13, it becomes possible to hold | maintain the shape of the segment 13 correctly.

  In addition, since the latest segment 13 immediately after assembly is immediately held, it is possible to prevent the segment 13 from rising and slipping off due to its own weight in the skin plate 9.

  Furthermore, since the shape holding device 31 does not occupy the lower part in the segment 13, a work space such as a transport for the segment pieces and a scaffold for assembly is secured in the segment 13, and the work efficiency can be improved. .

  In the present embodiment, the method of installing the pair of left and right vertical expansion / contraction means 37 and holding the segment 13 has been described. However, the present invention is not limited to this method. You may use the method hold | maintained by the vertical expansion-contraction means 37, and changes suitably according to field conditions, such as natural ground strength and the empty cross-sectional area in the segment 13.

Next, a reference example in which only the left / right expansion / contraction means 67 is used instead of the vertical expansion / contraction means 37 will be described, and then another embodiment of the present invention using the vertical expansion / contraction means 37 and the left / right expansion / contraction means 67 will be described. . In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

8 is a front sectional view of the tail portion 5 of the shield machine 1 in the reference example , and FIG. 9 is a view taken along the line AA ′ in FIG.
As shown in FIGS. 8 and 9, the shape holding device 60 includes a support frame 35, a pair of left and right expansion / contraction means 67 attached to both ends of the support frame 35 and capable of extending and contracting in the left and right directions, respectively, A bracket 39 connected to the outside of the expansion / contraction means 67 so as to be swingable in the tunnel direction, and two sliding portions 43 connected to the outside of each bracket 39 are provided.

  The support frame 35 includes a support beam 45 and extension beams 48 attached to both sides of the support beam 45 in an arm shape, and the support beam 45 and the extension beam 48 are detachably connected.

  The left / right expansion / contraction means 67 includes an outer cylinder 69 whose side surfaces are connected to the vertical expansion / contraction means 37, an inner cylinder 71 slidably inserted into the outer cylinder 69, and the inner cylinder 71 with respect to the outer cylinder 69 in the horizontal direction. And left and right jacks 73 for sliding them.

  The left and right jacks 73 include detection means for detecting the expansion / contraction amount of the jacks, and the extension stops when the predetermined extension amount is reached. In this embodiment, the left and right jacks are set so that the length from the left end of the left sliding body 41 to the right end of the right sliding body 41 with respect to the paper surface of FIG. Each extension amount when 73 is extended equally is defined as the above-described predetermined extension amount.

  Two sliding portions 43 are connected to the end portions of the brackets 39, and each sliding portion 43 is disposed so as to contact the inside of the segment 13 for one ring.

  The shape of the segment 13 is maintained by extending the left and right jacks 73 by a predetermined extension amount, sliding the inner cylinder 71 with respect to the outer cylinder 69, and contacting each sliding portion 43 against the inner surface of the segment 13. Do it. Here, when the left and right jacks 73 are extended by their predetermined extension amounts, the length from the left end of the left sliding body 41 to the right end of the right sliding body 41 becomes the design space of the segment.

  Further, even when the inclination of the shield machine 1 and the installation gradient of the segment 13 are different due to curved construction or the like, when the left and right jacks 73 are extended to bring the sliding portion 43 into contact with the inner surface of the segment 13, the sliding portion 43 is moved to the segment 13. The bracket 39 is rotated so as to be parallel to the inner surface of the segment 13, thereby preventing the sliding body 41 from hitting the inner surface of the segment 13.

  The shape holding device 60 extends the left and right jacks 73 by a predetermined extension amount, and the shield machine 1 is propelled without expanding and contracting the left and right jacks 73 while maintaining the shape of the segment 13d. 41 is advanced by sliding along the inner surface of the segment 13, and the sliding portion 43 moves to the latest segment 13e and maintains the shape of the segment 13e.

Therefore, according to the shape holding device 60 of the present reference example , since the left / right expansion / contraction means 67 that can be expanded / contracted in the left / right direction and the sliding portion 43 connected to the right or left end of the left / right expansion / contraction means 67 are provided, the segment It becomes possible to hold the shape of 13 horizontal directions.

  Further, even when the inclination of the shield machine 1 and the installation gradient of the segment 13 are different due to curved construction or the like, when the left and right extension / contraction means 67 is extended to bring the sliding portion 43 into contact with the inner surface of the segment 13, the sliding portion 43 is The bracket 39 rotates so as to be parallel to the gradient of 13, and the sliding body 41 can be prevented from hitting the inner surface of the segment 13.

  And in order to expand | extend the expansion amount of the left-right expansion-contraction means 67 set based on the design sky of the segment 13, it becomes possible to hold | maintain the shape of the segment 13 correctly.

In addition, in this reference example , although the method to hold | maintain the segment 13 which has a rectangular shape was demonstrated, it is not limited to this shape, For example, the shape of segments, such as a substantially U shape, can also be hold | maintained. Become.

Further, in this reference example , the method of holding the segment 13 by installing the left / right expansion / contraction means 67 near the center axis of the tunnel has been described, but the present invention is not limited to this position, and the upper or lower portion of the segment 13 is held. It may be changed as appropriate according to the field conditions such as the shape of the segment and the ground strength. Furthermore, for example, a method of holding a plurality of locations such as an upper portion and a lower portion of the segment 13 may be used.

Next, another embodiment of the present invention will be described.
Figure 10 is a front sectional view of the tail portion 5 of the shield machine 1 according to another embodiment of the present invention, FIG. 11 is a side sectional view of the shield machine 1 of the tail portion 5 according to another embodiment of the present invention is there.

  As shown in FIGS. 10 and 11, the shape holding device 61 includes a support frame 35, a pair of left and right vertical expansion / contraction means 37, a bracket 39 connected to the upper end of each vertical expansion / contraction means 37, and an upper part of the bracket 39. Are attached to the two sliding portions 43 connected to the lower end portions of the vertical expansion / contraction means 37 and the vertical expansion / contraction means 37, and can be expanded and contracted in the left and right directions, respectively. A pair of left and right expansion / contraction means 67, a bracket 39 connected to the outer side of each left / right expansion / contraction means 67 so as to be swingable in the tunnel direction, and two sliding portions 43 connected to the outside of each bracket 39 Prepare.

  The shape of the segment 13 is maintained by extending the upper and lower jacks 53 and the left and right jacks 73 by a predetermined extension amount and sliding the inner cylinders 51 and 71 with respect to the outer cylinders 49 and 69, respectively. Is performed in contact with the inner surface of the segment 13. Here, when the upper and lower jacks 53 and the left and right jacks 73 are respectively extended by a predetermined extension amount, the lower sliding body from the upper end of the upper sliding body 41 via the upper and lower expansion / contraction means 37 with respect to the paper surface of FIG. The length from the lower end portion of 41 and the length from the left end portion of the left sliding body 41 to the right end portion of the right sliding body 41 is the design space of the segment.

  The shape holding device 61 extends the upper and lower jacks 53 and the left and right jacks 73 by their respective predetermined extension amounts, and keeps the shape of the segment 13d without extending and lowering the upper and lower jacks 53 and the left and right jacks 73. At the same time as 1 is propelled, the sliding body 41 moves forward along the inner surface of the segment 13, and the sliding portion 43 moves to the latest segment 13e to maintain the shape of the segment 13e.

Therefore, according to the shape holding device 61 of the present embodiment , since the vertical extending / contracting means 37 that can be expanded / contracted in the vertical direction and the left / right expansion / contracting means 67 that can be expanded / contracted in the left / right direction are provided, the shape of the segment 13 is ensured. It becomes possible to hold.

  In addition, in order to expand the expansion amounts of the vertical expansion / contraction means 37 and the horizontal expansion / contraction means 67 set based on the design inner space of the segment 13, the shape of the segment 13 can be accurately maintained.

Further, in the present embodiment , the method of providing the left and right extension / contraction means 67 for each of the vertical extension / contraction means 37 has been described. However, the present invention is not limited to this. For example, the extension beam 47 is extended downward as shown in FIG. Alternatively, a method may be used in which the extension 47a is provided, and the left and right extension / contraction means 68 provided with the sliding portion 43 at both ends is provided below the extension 47a.

In all the above-described embodiments , the method of providing the pair of upper and lower extension / contraction means 37 on both sides of the extension beam 47 has been described. However, the present invention is not limited to this. For example, as shown in FIG. A pair of left and right upper and lower expansion means 75 are provided on the upper side of the extension beam 47 and a pair of left and right lower expansion and contraction means 77 are provided on the lower side of the extension beam 47. Then, a method of maintaining the shape of the segment 13 may be used.

  In all the embodiments described above, the method of holding the segments 13 for two rings using the two sliding portions 43 has been described. However, the present invention is not limited to this, and only the segment 13 for one ring is used. A method of holding may be used, and when holding one ring, it is desirable to hold the latest segment 13. Furthermore, when it takes a long time for the backing material to reach a predetermined strength, a method of holding the segments 13 for three rings or more using the three sliding portions 43 may be used.

Further, in all embodiments described above, the shape-retaining device 31, 61 has been described how to forward propulsion of the shield machine 1 at the same time, it is not limited thereto, for example, supporting the extension beam 4 7 slidably connected along the beam 45, after the shield machine 1 is promoted by a predetermined distance, the shape retaining device 31, 61 may be used a method of advancing by sliding along the support beam 45 .

  Furthermore, in all the above-described embodiments, the sliding body 41 made of a rotating body such as a roller has been described. However, the sliding body 41 is not limited to this, and the sliding body 41 has a small friction coefficient and is a replaceable plate-like sliding material. May be used.

DESCRIPTION OF SYMBOLS 1 Shield machine 3 Hood part 5 Tail part 7 Girder part 9 Skin plate 11 Shield jack 13 Segment 15 Main shield 17 Shield main body 19 Slide jack 23 Cutter head 25 Drive source 27 Power transmission mechanism 31 Shape holding device 33 Vertical beam 35 Support frame 37 Vertical extension means 39 Bracket 41 Sliding body 43 Sliding part 45 Support beam 47 Extension beam 47a Extension part 48 Extension beam 49 Outer cylinder 51 Inner cylinder 53 Upper and lower jacks 57 Discharge device 59 Segment assembly device 60 Shape holding device 61 Shape holding devices 67 and 68 Left / right expansion / contraction means 69 Outer cylinder 71 Inner cylinder 73 Left / right jack 75 Upper expansion / contraction means 77 Lower expansion / contraction means

Claims (6)

A shape holding device for holding the shape of a segment assembled when propelling a shield machine,
One end connected to the tail portion of the shield machine, the support beam and the other end protrudes to the rear of the shield machine,
A pair of extended beams that are detachably connected to the upper portion of the support beam and extend from the support beam to the left and right sides;
Up-and-down expansion and contraction means that can be expanded and contracted in the vertical direction connected to the respective ends of the pair of extension beams ;
A segment shape holding device comprising: a sliding portion connected to the upper and lower ends of the vertical expansion / contraction means, abutting against the inner surface of the segment and having a sliding body slidable along the inner surface of the segment.   The segment holding device according to claim 1, wherein the sliding body is a rotating body such as a roller.   2. The segment shape holding device according to claim 1, wherein the sliding body is made of a plate-shaped sliding material having a low frictional resistance and is replaceable. It said upper and lower stretchable hand stage is provided with a detecting means for detecting the extension contraction amount, shape-retaining device segment according to claim 1, characterized in that to retain the shape of the segments by extending a predetermined expansion amount. One end is connected to the tail part of the shield machine, the other end is connected to the support beam projecting rearward of the shield machine, and is detachably connected to the upper part of the support beam, and a pair of extension beams extending from the support beam to the left and right sides And vertically extending / contracting means connected to the respective ends of the pair of extension beams, and being connected to the end of the vertical extending / contracting means, abutting on the inner surface of the segment, and on the inner surface of the segment In a shape holding method for holding the shape of a segment using a shape holding device provided with a sliding portion having a sliding body that can slide along,
Extending the up-and-down telescopic means, the sliding body of the sliding portion abuts on the inner surface of the segment assembled immediately before, and maintains the shape of the segment assembled immediately before,
Assemble the latest segment inside the shield machine,
The shape holding device also moves forward by sliding the sliding body along the inner surface of the segment assembled immediately before, while maintaining the shape of the segment assembled immediately before without expanding and contracting the vertical expansion / contraction means. And
A segment shape holding method, wherein the slide body moves to the latest segment and simultaneously holds the latest segment shape. Said upper and lower stretchable hand stage, the shape holding method of a segment according to claim 5, characterized in that to retain the shape of the segments by extending a predetermined expansion amount.

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