JP4260669B2 - Tunnel cross-section change method and segment - Google Patents

Description

  The present invention relates to a tunnel cross-section changing method and a segment.

  Conventionally, in a buried pipe constructed by using a shield machine, a tunnel, or the like, a widened portion having a cross section larger than the normal portion may be required on the way due to structural and construction restrictions. In order to form the widened portion, in the tunnel in which the extra digging portion is filled with the filler, the widening segment is provided, and after the segment ring having the same outer diameter as the normal segment ring is installed, the extra digging portion is filled. A method has been proposed in which the widened segment is moved to the overexcavated portion while collecting the filler.

  Moreover, in the sharply curved part in the shield method, a segment with a bag in which a bag body is provided on the outer peripheral side of the segment body is used in order to reliably fill the tail void with the backfilling material (see, for example, Patent Document 1). ).

JP 2003-247392 A

  However, when filling the surplus excavation part and collecting it during the movement of the widening segment, the period from surplus excavation to widening is a highly permeable ground over a long period of time, and various other factors, The filler may flow away to the face and the natural ground, threatening the stability of the natural ground, and may not be widened due to the collapse of the natural ground.

  The present invention has been made in view of such a problem, and the purpose of the present invention is to ensure that the filler flows out from the overexcavated portion to the face side and the natural ground during the period until it is widened. It is another object of the present invention to provide a tunnel cross-section changing method and a segment that can prevent and prevent the filling material from being collected without mixing earth and sand when the widened segment is moved into the overexcavated portion.

  1st invention for achieving the objective mentioned above has the widening segment which has the widened segment by which the bag body was provided in the outer peripheral surface inside the pit which has a surplus digging part, and the widening which is the same outer diameter as a normal segment ring The step (a) of installing a segment ring for use, the step of filling the bag body with a filler, and the step of expanding the bag body so that the outer surface is along the pit wall of the surplus digging portion; And (c) a step of changing the cross section of the tunnel, the step of moving the widened segment in the outer circumferential direction of the tunnel while removing the filler from the bag body.

  Since the surplus digging portion is filled with the filler during excavation, in the step (a), the surplus digging portion is already filled with the filler. In the step (b), the filler filled in the overburden portion is collected inside the segment ring through the injection hole of the segment other than the widened segment, or at the same time released to the side ground, and the bag body is simultaneously removed. Inflate and place in the overburden.

  The widening segment has a widening member on the inner peripheral surface side. After the step (c), a step (d) for removing the temporary portion of the widening member provided in the widening segment is provided as necessary. In addition, after the step (d), while the widened segment is moved from the inside of the overexcavated portion to the inner circumferential direction of the tunnel, the bag body is filled with a filler or a backing material, and the outer side of the bag body is the well wall of the overexcavated portion. The step (e) of expanding so as to follow may be further provided.

  The second invention is a segment installed in a pit having an overexcavated portion, a widening member is provided on the inner peripheral surface side, a bag body is provided on the outer peripheral surface side, and is movable in the outer peripheral direction of the tunnel, When the widening member is moved into the surplus digging portion, the filler is collected from the inside of the bag body.

  The segment of 2nd invention is installed in the mine which has an overexcavation part. And when arrange | positioning a widening member in the normal cross section of a tunnel, a filling material is filled into the inside of a bag body, and a bag body is expanded so that an outer surface may follow the well wall of an overexcavation part. Further, when the widening member is moved into the overexcavated portion, the filler in the bag is collected in the segment ring.

  According to the tunnel widening method and segment of the present invention, it is possible to prevent the filler from flowing out from the overexcavated portion into the ground, and to reliably collect the filler when moving the widened segment into the overexcavated portion.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view in the axial direction of a tunnel in each step for widening the section. FIG. 2 is a view showing a state in which the widening segment ring 13 is installed in the pit 3 having the overexcavated portion 21. FIG. 1A is a diagram showing a process of installing the widening segment ring 13 in the well 3 and filling the bag 19 with the filler 17. FIG. 2 shows a cross section taken along line AA of FIG.

  In order to construct a tunnel having a widened portion, as shown in FIG. 1 (a) and FIG. 2, a mine 3 having an overexcavated portion 21 in the ground 1 using a shield machine (not shown). Drilling. A shield machine (not shown) assembles the segment ring in the machine while excavating the mine 3. Further, the filler 16 is filled into the surplus digging portion 21.

  A normal segment ring 15 composed of a normal segment 5 is installed in the well 3 having a normal cross section. In addition, a widening segment ring 13 having a widened segment 11 is installed in the pit 3 having the overexcavated portion 21. An adjustment segment ring 9 having an adjustment segment 7 is installed between the widening segment ring 13 and the normal segment ring 15.

  As shown in FIG. 1A and FIG. 2, the widening segment ring 13 is obtained by assembling the normal segment 5 and the widening segment 11 into a circular shape. A widening member 23 having a temporary portion 25 is provided on the inner peripheral surface 10 side of the widening segment 11. Moreover, the bag body 19 is fixed to the outer peripheral surface 12 side. The widened segment 11 is preferably made of steel. The bag body 19 is made of, for example, nylon or polyester. The widening segment ring 13 is installed in the pit 3 having the surplus digging portion 21 with the outer diameter equal to that of the normal segment ring 15. At this time, the bag body 19 is in a contracted state along the outer peripheral surface 12 of the widened segment 11.

  FIG. 3 is a view showing a state in which the bag 19 is filled with the filler 17. FIG. 3 shows a cross section taken along line BB of FIG. After the widening segment ring 13 in the state shown in FIG. 2 is installed in the mine 3, that is, after the rear end portion of the shield machine (not shown) passes through the mine 3 having the extra digging portion 21, FIG. (A) As shown in FIG. 3 and FIG. 3, the bag member 19 is filled with the filler 17 so that the outer surface 20 of the bag member 19 extends along the pit wall 22 of the surplus digging portion 21. The filling material 17 is filled into the bag body 19 from an injection hole (not shown) provided in the widened segment 11.

  Simultaneously with the filling of the filling material 17 into the bag body 19, the filling material 16 (FIG. 1 (a) and FIG. 2) filled in the digging portion 21 is used as an injection hole (not shown) of the normal segment 5. Or let it go to the natural ground 1 on the side.

  FIG. 1B shows a step of moving the widened segment 11. FIG. 4 is a diagram showing a state in which the widened segment 11 is moved in the tunnel outer peripheral direction. 4 is a cross-sectional view taken along the line C-C in FIG. As shown in FIG. 1B and FIG. 4, after the filling material 17 (FIG. 3) is filled in the bags 19 of all the widened segments 11, the shield machine (not shown) advances a predetermined distance. Next, the widened segment 11 is moved in the tunnel outer peripheral direction. At the same time, the filling material 17 filled in the bag body 19 is collected inside the widening segment ring 13 through an injection hole (not shown) provided in the widening segment 11.

  FIG. 1C shows a process of removing the temporary portion 25 of the widened segment 11 to complete the widened portion. FIG. 5 is a diagram illustrating a state in which the temporary portion 25 of the widening member 23 of the widening segment 11 has been removed. FIG. 5 is a cross-sectional view taken along the line DD in FIG. After all the widening segments 11 are moved in the tunnel outer peripheral direction, the temporary portion 25 of the widening member 23 is removed as shown in FIG. 1 (c) and FIG. Further, a part of the adjustment segment 7 is removed, and the inner diameter of the adjustment segment ring 9 is made to coincide with the inner diameter of the normal segment ring 15.

  As shown in FIG. 1 (c), the widened segment 11a adjacent to the adjusting segment 7 and the widened segment 11b not adjacent to each other are different in the temporary portion 25 (the removed portion of the widened member 23). By removing the temporary portions 25 of the plurality of widening segments 11 sequentially or simultaneously, the state shown in FIG. 1C is obtained, and the widening operation is completed.

  Thus, in 1st Embodiment, when the bag body 19 is fixed to the outer peripheral surface 12 of the widening segment 11, and the widening segment ring 13 is installed in the pit 3, the bag body 19 filled with the filler 17 is filled. Is installed in the overburden portion 21. Thereby, it can prevent that the filler 17 flows out to the face side or the natural ground 1 from the surplus digging part 21 after filling. Further, when the widened segment 11 is moved into the overexcavated portion 21, the filler 17 can be reliably recovered without involving earth or sand.

  Next, a second embodiment will be described. In the second embodiment, in the tunnel constructed by the method described in the first embodiment, after the use of the widened portion is finished, the widened portion is returned to the normal cross section. FIG. 6 is a sectional view in the axial direction of the tunnel with the widened portion changed to a normal section. FIG. 7 is a view showing a state in which the widening segment ring 13 has the same cross section as that of the normal segment ring 15. FIG. 7 shows a cross section taken along line EE of FIG.

  In order to return the widened portion shown in FIG. 1 (c) and FIG. 5 to the normal cross section, as shown in FIGS. 6 and 7, the widened segment 11 is moved in the inner circumferential direction of the tunnel, The outer diameter is generally matched with the outer diameter of the segment ring 15. At the same time, the inside of the bag body 19 is filled with a filler so that the outer surface 20 of the bag body 19 extends along the well wall 22 of the surplus digging portion 21. And the part located inside a tunnel among the widening members 23 is removed.

  As described above, in the second embodiment, when the widened segment 11 is moved from the inside of the extra dug portion 21 in the inner circumferential direction of the tunnel, the filler is placed inside the bag body 19 fixed to the outer peripheral surface 12 of the widened segment 11. 17 is filled, and the bag body 19 is installed in the surplus digging portion 21. Thereby, it can prevent that the filler 17 flows into the natural ground 1 from the surplus digging part 21 after filling.

  Next, a third embodiment will be described. In the third embodiment, a widened segment having a configuration different from that of the widened segment 11 used in the first and second embodiments is used. FIG. 8 is a view showing a state in which the widening segment ring 27 is installed in the pit 3 having the overexcavated portion 35. FIG. 8 is a cross-sectional view taken along line AA in FIG.

  In order to construct a tunnel having a widened portion, as in the first embodiment, as shown in FIGS. 1 (a) and 8, a ground machine 1 is used by using a shield machine (not shown). The mine 3 having the overexcavated portion 35 is excavated therein. A shield machine (not shown) assembles the segment ring in the machine while excavating the mine 3. In the third embodiment, a widening segment ring 27 is installed instead of the widening segment ring 13 of the first embodiment.

  As shown in FIG. 8, the widening segment ring 27 is formed by assembling the normal segment 5 and the widening segment 29 into a circular shape. The widened segment 29 and the normal segment 5 are connected by a movable portion 31. The widened segment 29 can move in the tunnel outer peripheral direction by rotating around the movable portion 31. A widening member 37 having a temporary portion 39 is provided on the inner peripheral surface 28 side of the widening segment 29. Moreover, the bag 33 is fixed to the outer peripheral surface 30 side. The widening segment 29 is preferably made of steel. The bag 33 is made of nylon, polyester, or the like.

  As shown in FIG. 1A and FIG. 8, the widening segment ring 27 is installed in the pit 3 having the overexcavated portion 35 with the outer diameter being equal to that of the normal segment ring 15. At this time, the bag 33 is in a contracted state along the outer peripheral surface 30.

  FIG. 9 is a view showing a state in which the bag body 33 is filled with the filler 41. FIG. 9 is a cross-sectional view taken along the line BB in FIG. After the widening segment ring 27 in the state shown in FIG. 8 is installed in the well 3, that is, after the rear end portion of the shield machine (not shown) passes through the well 3 having the overexcavated portion 35, ( a) As shown in FIG. 9 and FIG. 9, the bag body 33 is filled with a filler 41 and inflated so that the outer side surface 34 of the bag body 33 is along the pit wall 36 of the surplus portion 35. The filling material 41 is filled into the bag body 33 from an injection hole (not shown) provided in the widened segment 29.

  Simultaneously with the filling of the filling material 41 into the bag body 33, the filling material 32 (FIG. 1 (a) and FIG. 8) filled in the digging portion 35 is used as an injection hole (not shown) of the normal segment 5. To collect or escape to natural ground 1.

  FIG. 10 is a view showing a state where the widening segment 29 is moved in the tunnel outer peripheral direction and the temporary portion 39 of the widening member 37 is removed. FIG. 10 is a cross-sectional view taken along line DD of FIG. As shown in FIG. 1B and FIG. 10, after the filling material 41 (FIG. 9) is filled in the bags 33 of all the widened segments 29 and the shield machine (not shown) advances a predetermined distance. Next, the widened segment 29 is moved in the tunnel outer peripheral direction. At the same time, the filler 41 filled in the bag body 33 is collected inside the widening segment ring 27.

  After all the widening segments 29 are moved in the tunnel outer peripheral direction, the temporary portion 39 (FIG. 9) of the widening member 37 is removed as shown in FIG. 1 (c) and FIG. Similarly to the first embodiment, a part of the adjustment segment 7 is removed, and the inner diameter of the adjustment segment ring 9 is matched with the inner diameter of the normal segment ring 15.

  As shown in FIG. 1C, the widened segment 29a adjacent to the adjusting segment 7 and the widened segment 29b not adjacent to each other are different in the temporary portion 39 (the removed portion of the widened member 37). By removing the temporary portions 39 of the plurality of widening segments 29 sequentially or simultaneously, the state shown in FIG. 1C is obtained, and the widening operation is completed.

  Thus, in the third embodiment, when the bag body 33 is fixed to the outer peripheral surface 30 of the widening segment 29 and the widening segment ring 27 is installed in the well 3, the bag body 33 filled with the filler 41 is filled. Is installed in the overburden portion 35. Thereby, it can prevent that the filler 41 flows out from the surplus digging part 35 to the face side or the natural ground 1. Further, when the widened segment 29 is moved into the overburden portion 35, the filler 41 can be reliably recovered without mixing earth and sand.

  The preferred embodiments of the tunnel widening method and segments according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the widening segment to be used is not limited to those shown in the first to third embodiments. As a form of movement of the widened segment, a parallel movement such as the widened segment 11 and a rotational movement such as the widened segment 29 are conceivable. The widened segment is preferably made of steel, but may be formed of other materials. The bag provided in the widened segment may be any material that is flexible and can hold the filler.

  Moreover, in FIG. 1, although the overexcavation part was provided in the one side surface of the tunnel and the widening part was formed, the position which performs overexcavation is not restricted to this. For example, the widened portion may be formed by excavating an excessively dug portion on both side surfaces. In some cases, muddy water or the like is injected into the overexcavated portion or bag instead of the filler.

Cross-sectional view of tunnel in the axial direction at each step for widening the cross-section The figure which shows the state which installed the segment ring 13 for widening in the mine 3 which has the surplus digging part 21 The figure which shows the state which filled the filler 17 in the bag body 19 The figure which shows the state which moved the widening segment 11 to the tunnel outer peripheral direction The figure which shows the state which removed the temporary part 25 of the widening member 23 of the widening segment 11 Sectional view in the axial direction of the tunnel with the widened part changed to the normal section The figure which shows the state which made the segment ring 13 for widening the same cross section as the normal segment ring 15 The figure which shows the state which installed the segment ring 27 for widening in the mine 3 which has the surplus digging part 35 The figure which shows the state which filled the bag material 33 with the filler 41. The figure which shows the state which moved the widening segment 29 to the tunnel outer peripheral direction, and removed the temporary part 39

Explanation of symbols

1 ......... Mt. 3 ......... Well 5 ......... Normal segment 10, 28 ......... Inner peripheral surface 11, 29 ......... Wide segment 12, 30 ......... Outer peripheral surface 13, 27 ......... For widening Segment ring 15 ......... Normal segment ring 16, 17, 32, 41 ......... Filler 19, 33 ......... Bag body 20, 34 ......... Outer surface 21, 35 ......... Excavated portion 22, 36 ... ...... Whole walls 25, 39 ......... Temporary part

Claims (5)

A step (a) of installing a widening segment ring having the same outer diameter as a normal segment ring, having a widened segment with a bag provided on the outer peripheral surface inside the pit having an overexcavated portion;
Filling the bag body with a filler, and inflating the bag body so that the outer surface is along the pit wall of the surplus digging portion;
A step (c) of removing the filler from the bag body and moving the widened segment in the tunnel outer peripheral direction and installing it in the overexcavated portion;
A method for changing the cross section of a tunnel, comprising: The method for changing the cross section of a tunnel according to claim 1, wherein the widening segment is provided with a widening member on an inner peripheral surface side. The tunnel cross-section changing method according to claim 2, further comprising a step (d) of removing the temporary portion of the widening member after the step (c). After the step (d), the bag is filled with a filler or a backing material while the widened segment is moved from the inside of the overexcavated portion toward the inner periphery of the tunnel, and the outer side of the bag is filled with the extra side. The tunnel cross-section changing method according to claim 3, further comprising a step (e) of expanding along the pit wall of the digging portion. A segment installed in a mine having an overexcavation part,
A widening member is provided on the inner peripheral surface side, and a bag body is provided on the outer peripheral surface side, which is movable in the outer peripheral direction of the tunnel, and is filled from the inside of the bag body when moving the widening member into the digging portion. A segment characterized in that the material is collected.

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