JP4640079B2 - 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 base frame projecting rearward from the shield machine main body and on both upper and lower sides of the base frame and extend in the vertical direction. 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 respectively attached to the upper end portion and the lower end portion of the lifting jack, and the rearmost end side. It has a unit transfer mechanism that moves the shape-retaining unit located inside the other shape-retaining units to the frontmost end position, and each shape-retaining unit holds a segment for one ring. A shape retaining device is shown. After assembling the latest segment, this shape holding device moves the innermost shape retaining unit of the rearmost end side through the inside of the remaining plural shape retaining units and moves it to the foremost end. 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,
Up and down expansion and contraction means connected to the rear of the shield machine body and capable of extending and contracting in the vertical direction;
Left and right expansion and contraction means connected to the rear of the shield machine body and capable of expanding and contracting in the left and right direction;
A sliding part connected to the upper and lower ends of the upper and lower extension means and the left and right ends of the left and right extension means , abutting the inner surface of the segment and having a sliding body slidable along the inner surface of the segment; It is characterized by.

According to the segment shape holding device of the present invention, the shape holding device holds the shape of the segment assembled immediately before, and expands and contracts the vertical stretching means and the left and right stretching means (releases the shape holding device). It is possible to slide forward along the inner surface of this segment 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 perform the expansion / contraction work of the vertical expansion / contraction means and the left / right expansion / contraction means , the replacement work of the shape holding device, etc., the construction period can be shortened and the construction cost can be reduced.
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.

Also, in order to hold the segments in the left-right direction at the right and left elastic means, having a vertical segment is not in the shape, for example, can be held a segment having a shape such as a substantially U-shaped and that Do.

In the present invention, a bracket is provided between at least one of a left end portion and a right end portion of the left and right expansion / contraction means and the sliding portion so as to be swingable back and forth in the traveling direction.
According to the segment shape holding device of the present invention, even when the inclination of the shield machine and the installation gradient of the segment are different due to curved construction or the like, when extending the left and right expansion and contraction means to contact the sliding part to the inner surface of the segment, bracket is swung so slider is parallel to the slope of the segment, that Do is possible sliding body is prevented from uneven contact with the inner surface of the segment.

Moreover, in this invention, the said sliding body consists of rotary bodies, such as a roller, It is characterized by the above-mentioned.

In the present invention, the sliding body is made of a plate-shaped sliding material having a small frictional resistance and can be replaced.

Further, in the present invention, the vertical expansion / contraction means and the left / right expansion / contraction means are provided with detection means for detecting the expansion / contraction amount of each expansion / contraction means, and maintain the shape of the segment by extending a predetermined expansion amount. To do.
According to the segment shape holding device of the present invention, the shape of the segment is accurately held in order to extend the extension amounts of the vertical extension means and the right and left extension means set based on the design inner space of the segment. Is possible.

The segment shape maintaining method of the present invention includes a vertical expansion / contraction means connected to the rear of the shield machine main body and capable of expanding and contracting in the vertical direction, and a left / right expansion / contraction means connected to the rear of the shield machine main body and capable of extending in the horizontal direction. wherein respectively connected to the ends of the upper and lower telescopic section and the lateral stretch means, with contact with the inner surface of the segment, a slider having a slidable sliding body along the inner surface of the segment, the shape-retaining device provided with In the shape holding method that uses the shape of the segment to hold,
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,
Immediately before or immediately after the step of extending the vertical expansion / contraction means and maintaining the shape of the segment assembled immediately before, the left / right expansion / contraction means is extended and the sliding body of the sliding part is assembled to the inner surface of the segment. To keep the shape of the segment assembled just before the contact,
Assemble the latest segment inside the shield machine,
The sliding body slides in the advancing direction 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 and contraction means and the left and right expansion / contraction means. The shape retention device has also advanced,
You wherein sliding body holds the shape of the latest segment and simultaneously moved to the most recent segment.

Also, in the present invention, the vertical stretching means or the lateral stretch means you 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.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 is a front rectangular shield machine diagram according to implementation embodiments of the present invention, FIG. 2 is a side sectional view of a rectangular shield machine according to the implementation embodiments of the present invention. In FIG. 2, description of the left / right expansion / contraction means 67 described later is omitted.

  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.

Segment assembly device 59 is provided for assembling a segment 13 comprising a plurality of pieces inwardly of the tail section 5 sequentially segment 13 is assembled to the inner surface of the tunnel excavated by the segment assembly device 59, inner wall by segments 13 Built.
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 according to the present implementation mode, Fig 4 is a side cross-sectional view of the tail portion 5 of the shield machine 1 according to the present implementation embodiment.

The shape holding device 31 for holding the shape of the segment 13 has one end connected to a vertical beam 33 (shown in FIG. 2) installed in the tail portion 5 of the shield machine 1 and the other end behind the shield machine 1. And a pair of left and right upper and lower expansion / contraction means 37 attached to the support frame 35 and extendable in the vertical direction. A bracket 39 that is movably connected by pin coupling, and two sliding portions 43 that are connected to the upper portion of the bracket 39 and abut against the inner surface of the segment 13 and have a sliding body 41 that can slide along the inner surface. When, the two slide portions 43 that are connected to the lower end of the upper and lower telescopic unit 37, attached to each vertical expansion means 37, the left, a pair of retractable respectively in the right direction and the left and right elastic means 67 It comprises a bracket 39 which is swingably connected to the tunnel direction outer side of the left and right telescopic means 67, and two slide 43 which is connected to the outside of each bracket 39, a.

  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.

First, the vertical expansion / contraction means 37 will be described, and then the horizontal expansion / contraction means 67 will be described.
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 (described later) to the lower end of the lower sliding body 41 with respect to the paper surface of FIG. The extension amount when the upper and lower jacks 53 are extended in such a manner is set as 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.
FIG. 5 is a side sectional view of the tail portion 5 of the shield machine 1 according to the present embodiment. In the drawing, the vertical expansion / contraction means 37 is not shown.
As shown in FIG. 5, the left / right expansion / contraction means 67 includes an outer cylinder 69 whose side surface is connected to the vertical expansion / contraction means 37, and an inner cylinder 71 (shown in FIG. 3) slidably inserted into the outer cylinder 69. A left and right jack 73 (shown in FIG. 3) for sliding the inner cylinder 71 in the left-right direction with respect to the outer cylinder 69 is provided.
The left and right jacks 73 are provided with detection means for detecting the expansion / contraction amount of the jacks, and the extension stops when the predetermined extension amount is reached. In the present 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 front and rear sliding portions 43 of the left and right expansion / contraction means 67 are in contact with the inner surface of the same segment 13 as the front and rear sliding portions 43 of the vertical expansion / contraction means 37, respectively.

The shape of the segment 13 is maintained by the upper and lower expansion / contraction means 37 having the above-described configuration by extending the upper and lower jacks 53 by a predetermined extension amount and sliding the inner cylinders 51 upward with respect to the outer cylinders 49. This is performed by bringing the sliding portion 43 into contact with the inner surface of the segment 13. 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.
The shape of the segment 13 is maintained by the left and right expansion / contraction means 67 having the above-described configuration. The left and right jacks 73 are extended by a predetermined extension amount, and the respective inner cylinders 71 are slid with respect to the outer cylinder 69. 43 is performed in contact with the inner surface of the segment 13. Here, when the left and right jacks 73 are extended by the predetermined extension amounts, the length from the left end portion of the left sliding body 41 to the right end portion of the right sliding body 41 becomes the design inner space of the segment 13, and this state Thus, the shape of the segment 13 can be maintained.
In short, the shape of the segment 13 is maintained by the vertical extending / contracting means 37 and the left / right extending / contracting means 67 by extending the upper and lower jacks 53 and the left and right jacks 73 by a predetermined extension amount, and the respective inner cylinders 51 and 71 are moved to the outer cylinder 49, 69, the sliding portions 43 are brought into 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 becomes the design inner space of the segment 13, and the shape of the segment 13 can be maintained in this state. .

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 upper and lower jacks 53 and the left and right jacks 73 are respectively extended and the respective sliding portions 43 are brought into contact with the inner surface of the segment 13, The bracket 39 rotates so that the sliding portion 43 is parallel to the gradient of the segment 13, thereby preventing the sliding body 41 from hitting the inner surface of the segment 13.

The upper and lower jacks 53 and the left and right jacks 73 are extended by a predetermined extension amount, and the shield machine 1 slides when propelled without the upper and lower jacks 53 and the left and right jacks 73 being expanded and contracted while maintaining the shape of the segment 13d. When the portion 43 slides along the inner surface of the segment 13, the shape holding device 31 moves forward together with the shield machine 1, and when the sliding portion 43 moves to the latest segment 13 e, the shape of the segment 13 e is held.

Hereinafter, an operation method of the shape holding device 31 will be described.
6-9 is a figure which shows the operating method of the shape holding | maintenance apparatus 31 which concerns on this embodiment . In these drawings, the left / right expansion / contraction means 37 is not shown.

First, as shown in FIG. 6 , the upper and lower jacks 53 and the left and right jacks 73 of the shape maintaining device 31 are each extended by a predetermined extension amount, and the two sliding portions 43 arranged at the front and the rear are respectively connected to the existing segments 13c. The shape of each segment 13 is held in contact with the inner surface of 13d.
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. 7 , the shield jack 11 is extended by using the front end of the latest segment 13 e as a reaction material, and 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 shape holding device 31 moves forward at the same time as the shield machine 1, and as the shape holding device 31 moves forward, the sliding portions 43 that are in contact with the inner surfaces of the segments 13 c and 13 d. Is moved toward the latest segment 13e while maintaining the shape of the segments 13c and 13d by rotating the sliding body 41.

As shown in FIG. 8 , 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 31 is removed.

Then, as shown in FIG. 9 , 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, the latest shape of the segment 13 is maintained without expanding / contracting the vertical expansion / contraction means 37 and the horizontal expansion / contraction means 67 (releasing the shape holding device 31 ) while maintaining the shape of the segment 13 assembled immediately before. It becomes possible. In other words, the work of extending and retracting the upper and lower jacks 53 and the left and right jacks 73 , the work of changing the shape holding device 31, and the like are not required, so 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 expansion / contraction means 37 and the horizontal expansion / contraction means 67 are extended and the respective sliding portions 43 are brought into contact with the inner surface of the segment 13 Further, the bracket 39 rotates so that the sliding portion 43 is parallel to the gradient of the segment 13, and the sliding body 41 can be prevented from hitting the inner surface of the segment 13.

Then, since 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 are expanded, the shape of the segment 13 can be accurately maintained.

  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.
Moreover, in this embodiment, 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.
In the present embodiment, the left and right extension / contraction means 67 is installed near the lower part of the tunnel and the method for holding the segment 13 is shown. However, the present invention is not limited to this position. You may hold | maintain and it changes suitably according to field conditions, such as the shape of the segment 13, and natural 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, a reference example using only 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.

Figure 10 is a Ru der front sectional view of the tail portion 5 of the shield machine 1 in Reference Example.
As shown in FIG. 10 , 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, and the left and right expansion / contraction means 67. The bracket 39 is connected to the outer side of the bracket 39 so as to be swingable in the tunnel direction, and two sliding portions 43 are connected to the outer side of the brackets 39.

  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 reference example , the right and left 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 a predetermined extension amount, 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 inner space of the segment 13 .

  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 shown in this reference example, and provided with a stretchable lateral stretch means 67 in the lateral direction and the slide 43 connected to the right or left end of the left and right elastic means 67 For this reason, the shape of the segment 13 in the left-right direction can be maintained.

  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.

Then, in order to extend the extension of left and right telescopic means 67 which is set based on the design in an empty segment 13, it can be kept exactly the shape of the segment 13 and that Do.

In the embodiment described above has been described a method of providing a left and right stretch unit 67 to the respective upper and lower elastic means 37, is not limited thereto, for example, the extension beams 47 extend downward as shown in FIG. 11 Alternatively, a method may be used in which an extension 47a is provided, and a single left and right extension / contraction means 68, which extends and contracts in the left-right direction below the extension 47a and includes the sliding portions 43 at both ends, may be used.

In the above embodiment has described a method of providing a pair of upper and lower elastic means 37 on either side of the extension beam 47, is not limited thereto, for example, as shown in FIG. 12, the upper extension beam 47 an upper telescopic unit 75 that expands and contracts toward the right and left pair of upper and a lower telescopic unit 77 that expands and contracts toward the pair of right and left lower on the lower side of the extension beam 47 is provided, the upper-lower telescopic unit 75, 77 respectively A method of extending and maintaining the shape of the segment 13 may be used.

Moreover, in the said embodiment, although the method to hold | maintain the segment 13 for 2 rings using the two sliding parts 43 was demonstrated, it is not limited to this, Only the segment 13 for 1 ring is hold | maintained. The method 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.

In the above embodiment, the shape-retaining device 3 1 has been described how to forward propulsion of the shield machine 1 at the same time, it is not limited thereto, for example, along the extension beam 4 7 support beam 45 slidably coupled Te, after the shield machine 1 is promoted by a predetermined distance, a method may be used to advance the shape-retaining device 3 1 is slid along the support beam 45.

Furthermore, in the said embodiment, although the sliding body 41 which consists of rotary bodies, such as a roller, was demonstrated, it is not limited to this, As a sliding body 41, a small friction coefficient and the exchangeable plate-shaped sliding material are used. May be.

It is a front view of a rectangular shield machine according to the implementation embodiments of the present invention. It is a side sectional view of a rectangular shield machine according to the implementation embodiments of the present invention. It is a front sectional view of the tail portion of the shield machine according to the present implementation embodiment. It is a sectional side 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 side sectional view of a tail portion of the shield machine according to the present implementation embodiment. It is a diagram illustrating a method of operating the shape-retaining device according to the present implementation embodiment. It is a diagram illustrating a method of operating the shape-retaining device according to the present implementation embodiment. It is a diagram illustrating a method of operating the shape-retaining device according to the present implementation embodiment. Ru front sectional view der of the tail portion of the shield machine in Reference Example. It is a figure which shows the other installation method of the left-right expansion-contraction means which concerns on this invention. It is a figure which shows the other installation method of the vertical expansion-contraction means which concerns on this invention.

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 Slide body 43 Slide section 45 Support beam 47 Extension beam 47a Extension part 48 Extension beam 49 Outer cylinder 51 Inner cylinder 53 Vertical jack 57 Discharge device 59 Segment assembly device 60 Shape holding device 67, 68 Left and right extension means 69 Outer cylinder 71 Inner cylinder 73 Left and right jack 75 Upper telescopic means 77 Lower telescopic means

Claims (7)

A shape holding device for holding the shape of a segment assembled when propelling a shield machine,
Up and down expansion and contraction means connected to the rear of the shield machine body and capable of extending and contracting in the vertical direction;
Left and right expansion and contraction means connected to the rear of the shield machine body and capable of expanding and contracting in the left and right direction;
A sliding part connected to the upper and lower ends of the upper and lower extension means and the left and right ends of the left and right extension means , abutting the inner surface of the segment and having a sliding body slidable along the inner surface of the segment; A segment shape holding device characterized by the above. The segment shape according to claim 1 , further comprising a bracket that is swingably connected back and forth in a traveling direction between at least one of a left end portion and a right end portion of the left / right expansion / contraction means and the sliding portion. Holding device. 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 means and said lateral stretch means, according to claim 1 or 2 comprising a detection means for detecting the amount of extension of the telescopic means and to retain the shape of the segments by extending a predetermined expansion amount The shape retaining device for segments as described in 1. And extendable vertically extendable means in the vertical direction is connected to the rear of the shield machine main body, and extendable horizontally extendable means in the lateral direction is connected to the rear of the shield machine main body, of the upper and lower telescopic section and the lateral stretch means each is connected to the end, with contact with the inner surface of the segment, shape retention to maintain the shape of the segments using the shape-retaining device and a sliding portion having a slidable sliding body along the inner surface of the segment In the method
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,
Immediately before or immediately after the step of extending the vertical expansion / contraction means and maintaining the shape of the segment assembled immediately before, the left / right expansion / contraction means is extended and the sliding body of the sliding part is assembled to the inner surface of the segment. To keep the shape of the segment assembled just before the contact,
Assemble the latest segment inside the shield machine,
The sliding body slides in the advancing direction 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 and contraction means and the left and right expansion / contraction means. The shape retention device has also advanced,
A segment shape holding method, wherein the slide body moves to the latest segment and simultaneously holds the latest segment shape. 7. The segment shape maintaining method according to claim 6 , wherein the up / down extension means or the left / right extension means holds the shape of the segment by extending a predetermined extension amount.

Images