JP4778488B2 - Segment and segment manufacturing method - Google Patents

Description

  The present invention relates to a segment for a shield tunnel and a method for manufacturing the segment.

  Conventionally, as a segment used in a shield tunnel, there is one in which two joint plates are provided at an end portion in the tunnel circumferential direction of one skin plate. However, in such a segment, the body structure is unequal angle iron, and the contribution rate of the skin plate to the cross-sectional force is small, so the thickness and height of the joint plate and main girder increase for a large cross-sectional force. It has responded by. (For example, refer to Patent Document 1 and FIG. 2)

There is also a sandwich type steel concrete composite segment.
FIG. 4 shows such a segment 200 having two skin plates, an outer skin plate 103 and an inner skin plate 105.

  In the segment 200, the inner skin plate 105 having the notch 117 is provided with a bolt box 109 according to the notch 117, the joint plate 111 is welded to the bolt box 109, and the outer skin plate 103 is welded to the joint plate 111. When welding the bolt box 109 to the inner skin plate 105, the welding tool can be accessed from both the inner peripheral side and outer peripheral side of the bolt box 109, and as shown in FIGS. 5A and 5C, Both sides of the side plate can be welded to the inner skin plate 105.

JP 2005-351535 A

  However, when the outer skin plate 103 is welded to the bolt box 109, since the joint plate 111 is already welded to the bolt box 109, it becomes difficult to access the welding instrument to the outer peripheral side of the bolt box 109. 5 (a) and 5 (b), only one side of the side plate of the bolt box 109 can be welded to the outer skin plate 103. Therefore, the fixing strength between the bolt box 109 and the outer skin plate 103 is weakened, and in order to make the joint portion sufficiently strong, it is necessary to increase the size of the bolt box 109 and lengthen the welded portion, There is a problem that it is necessary to increase the thickness of the steel material of the box 109, and the amount of steel material used for the bolt box 109 is increased. For this reason, there existed a problem of causing the increase in manufacturing cost and the increase in construction management cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a low-cost segment or the like that can use a small-sized bolt box.

In order to achieve the above-described object, the first invention includes an inner skin plate having a notch at an end and an inner bolt box at the notch, and an end of the inner skin plate. An inner joint plate, an outer skin plate provided with an outer bolt box at an end, an outer joint plate provided at an end of the outer skin plate, and a pair of side plates, the inner skin plate, The segment is characterized in that the outer skin plate and the pair of side plates are formed in a box shape.
Moreover, it is preferable that the inside is filled with concrete, and it is preferable that a bolt box for a ring is provided at an end portion on the long side of the inner skin plate. The inner bolt box and the outer bolt box are preferably provided by welding to the inner skin plate and the outer skin plate, respectively.

  In the first invention, the bolt box is welded to the skin plate on both sides of the side plate, and the strength of welding between the bolt box and the skin plate is improved. Therefore, the size of the bolt box can be reduced, and the thickness of the steel material of the bolt box and the joint plate can be reduced, so that the amount of steel used can be reduced.

  The second invention includes a step of providing an inner bolt box around the notch of the inner skin plate, a step of providing an inner joint plate at an end of the inner skin plate, a step of providing an outer bolt box on the outer skin plate, A step of fixing an outer joint plate to an end portion of the outer skin plate, and a step of forming a box-shaped segment with the inner skin plate, the outer skin plate, and a pair of side plates. This is a method for manufacturing a segment. Moreover, it is preferable to further comprise a step of filling the inside with concrete.

  According to the present invention, a small bolt box can be used, and a low-cost segment or the like can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a segment 1 according to the first embodiment. The outer skin plate 3 is provided with an outer bolt box 9 and an outer joint plate 13 for connecting the segments. A notch 29 is provided around the inner skin plate 5, and an inner bolt box 11 and an inner joint plate 15 for connecting the segments and a bolt box 19 for connecting the rings are provided at positions corresponding to the notches 29. It has been. The outer joint plate 13, the inner joint plate 15, and the side plate 7 each have a bolt hole 17. A bolt (not shown) is inserted through the notch 29, and the segment 1 is adjacent to the adjacent segment (not shown) and the bolt. It can be concluded by. The side plate 7 has a concrete injection hole 18. The outer skin plate 3, the inner skin plate 5, and the side plate 7 are provided in a box shape, and concrete is filled between the outer skin plate 3 and the inner skin plate 5 to form the segment 1.

  The outer skin plate 3, the inner skin plate 5, the side plate 7, the outer bolt box 9, the inner bolt box 11, the outer joint plate 13, the inner joint plate 15, and the bolt box 19 are each made of steel, for example, SM490.

  The outer joint plate 13 and the outer bolt box 9, and the inner joint plate 15 and the inner bolt box 11 are all strongly welded.

  The welding between the outer joint plate 13 and the inner joint plate 15 is preferably welding to such an extent that the accuracy of the joint surface and water stoppage can be ensured.

  The welding between the outer bolt box 9 and the inner bolt box 11 is preferably a welding that can prevent leakage at the time of placing concrete.

  The outer bolt box 9, the inner bolt box 11, and the bolt box 19 may have not only a U-shaped cross section but also an H-shaped cross section.

Next, the manufacturing method of the segment 1 which concerns on 1st Embodiment is demonstrated.
2A to 2J are views showing a method for manufacturing the segment 1 according to the first embodiment.

  FIG. 2A shows the outer skin plate 3. The outer skin plate 3 is a curved plate material.

  FIG. 2B is a diagram showing a configuration of the outer bolt box 9. The outer bolt box 9 is composed of three plate-like members, and joins the first side plate 21, the second side plate 23, and the third side plate 25 so that the cross section has a U-shape.

  As shown in FIG. 2C, an outer bolt box 9 is provided at the end of the short side of the outer skin plate 3 so as to be directed toward the tunnel center.

  2D is a view as viewed from the arrow A in FIG. 2C, and FIG. 2E is a view as viewed from the arrow B in FIG. 2C. The outer skin plate 3 and the second side plate 23 are fillet welded on both sides at a fillet weld portion 27. The outer skin plate 3 and the first side plate 21 are similarly fillet welded on both sides. The third side plate 25 and the outer skin plate 3 may or may not be welded.

  Next, as shown in FIG. 2 (f), the outer joint plate 13 is welded to the outer skin plate 3 so that the bolt hole 17 corresponds to the position of the outer bolt box 9.

  FIG. 2G shows the inner skin plate 5. A notch 29 is provided around the inner skin plate 5.

  As shown in FIG. 2 (h), the inner bolt box 11 and the bolt box 19 are provided in accordance with the position of the notch 29. At this time, both surfaces of the plates forming the side surfaces of the inner bolt box 11 and the bolt box 19 are fillet welded to the inner skin plate 5. That is, both sides of the plates forming the side surfaces of the inner bolt box 11 and the bolt box 19 are welded to the inner skin plate 5 in the same manner as the outer bolt box 9 is welded to the outer skin plate 3.

  Next, as shown in FIG. 2 (i), an inner joint plate 15 is welded to the inner skin plate 5 so that the position of the inner bolt box 11 and the position of the bolt hole 17 correspond to each other.

  Next, as shown in FIG. 2 (j), the outer skin plate 3 and the inner skin plate 5 face each other with the outer bolt box 9, the inner bolt box 11 and the bolt box 19 inside, and the outer skin plate 3 and the inner skin plate 3 face each other. Side plates 7 having bolt holes 17 and concrete injection holes 18 are attached from the left and right sides of the skin plate 5. That is, the outer joint plate 13 and the inner joint plate 15 are welded, and the side plate 7 is welded to the outer skin plate 3 and the inner skin plate 5 to form a box.

  Thereafter, the concrete injection hole 18 is laid sideways so as to face upward, and concrete (not shown) is filled from the concrete injection hole 18 to complete the segment 1.

  2 (d) and FIG. 5 (a), and FIG. 2 (e) and FIG. 5 (b) are compared, the bolt box 109 and the outer skin plate 103 in FIG. 5 (a) and FIG. In the meantime, only the inner peripheral side of the bolt box 109 is welded, whereas in FIGS. 2 (d) and 2 (e), both the side plates 21 and 23 of the outer bolt box 9 are attached to the outer skin plate 3. Welded. 5 (a) and 5 (b), the joint plate 111 is welded to the inner skin plate 105 provided with the bolt box 109, the outer skin plate 103 is welded to the joint plate 111, and then the outer skin. This is because the bolt box 109 is welded to the plate 103, so that it is difficult to access the welding instrument to the outer periphery of the bolt box 109. On the other hand, in FIGS. 2D and 2E, the outer bolt box 9 is attached only to the outer skin plate 3, and the welding tool accesses both the outer peripheral side and the inner peripheral side of the outer bolt box 9. This is because it is possible.

  Thus, according to the first embodiment, the first side plate 21 and the second side plate 23 of the outer bolt box 9 are fillet welded to the outer skin plate 3 on both sides of the plate. Similarly, both sides of the plate forming the side surface of the inner bolt box 11 are fillet welded to the inner skin plate 5. Therefore, the depth of the bolt boxes 9 and 11 can be shortened compared to the bolt box 109 that can be welded only on one side of the plate forming the side surface of the conventional segment 200. Moreover, the thickness of the steel used for the bolt boxes 9 and 11 can also be reduced. Therefore, it becomes possible to reduce the amount of steel used for the bolt boxes 9 and 11.

Next, a second embodiment will be described.
FIG. 3 is a diagram illustrating a segment 100 according to the second embodiment. In the second embodiment, elements having the same functions as those of the segment 1 according to the first embodiment are denoted by the same reference numerals, and redundant description is avoided. In the segment 100, the outer joint plate 13 and the inner joint plate 15 are not in contact with each other, and the filled concrete 31 is exposed.

  The second embodiment also has the same effect as the first embodiment.

  The preferred embodiment of the segment according to the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to such an example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

The figure which shows the segment 1 which concerns on 1st Embodiment Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 Diagram showing manufacturing process of segment 1 The figure which shows the segment 100 which concerns on 2nd Embodiment The figure which shows the segment 200 which concerns on a prior art example FIG. 4A view (joint plate omitted) B arrow view of FIG. 4 (joint plate is omitted) C view of FIG. 4 (joint plate omitted)

Explanation of symbols

1, 100, 200 ......... Segment 3 ......... Outer skin plate 5 ......... Inner skin plate 7 ......... Side plate 9 ......... Outer bolt box 11 ......... Inner bolt box 13 ......... Outer joint plate 15 ……… Inner joint plate 17 ……… Bolt hole 18 ……… Concrete injection hole 19 ……… Bolt box 21 ………… First side plate 23 ……… Second side plate 25 ……… Third side plate 27 ……… Fillet weld 29 ......... Notch 31 ......... Concrete 103 ......... Outer skin plate 105 ...... Inner skin plate 107 ......... Side plate 109 ......... Bolt box 111 ......... Fitting plate 113 ......... Bolt hole 114 ......... Concrete injection hole 115 ... ... Fillet welded part 117 ... ... Notch part

Claims (6)

An inner skin plate having a notch at the end, and an inner bolt box provided in the notch,
An inner joint plate provided at an end of the inner skin plate;
An outer skin plate with an outer bolt box at the end;
An outer joint plate provided at an end of the outer skin plate;
A pair of side plates;
Comprising
A segment characterized in that the inner skin plate, the outer skin plate, and the pair of side plates are formed in a box shape.   The segment according to claim 1, wherein the interior is filled with concrete.   The segment according to claim 1, wherein a bolt box for a ring is provided at an end portion on a long side of the inner skin plate.   The segment according to claim 1, wherein the inner bolt box and the outer bolt box are welded to the inner skin plate and the outer skin plate, respectively. Providing an inner bolt box around the notch of the inner skin plate;
Providing an inner joint plate at an end of the inner skin plate;
Providing an outer bolt box on the outer skin plate;
Fixing the outer joint plate to the end of the outer skin plate;
Forming a box-shaped segment with the inner skin plate, the outer skin plate, and a pair of side plates;
A process for producing a segment, comprising:   The segment manufacturing method according to claim 5, further comprising a step of filling the interior with concrete.

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