JP4805071B2 - Segment with bag - Google Patents

Description

  The present invention relates to a bag-attached segment including a bag body used when a tail void is filled with a backing material in, for example, a shield method.

  For example, in the shield method, it is formed between a ground surface of a tunnel excavation tunnel excavated by a shield machine and a cylindrical wall body (covering) formed by connecting a plurality of segments so as to cover the ground surface. The tail void (air gap) is filled with a back-filling material such as mortar from an injection hole formed so as to penetrate the front and back of the segment, thereby preventing loosening of the ground due to skin fall of the natural ground. At this time, large tail voids are likely to be formed especially at sharply curved construction sites where the direction of excavation changes abruptly.When this large tail void is filled with backing material at high pressure, the backing material flows out of the tail void and shields it. In some cases, it flowed into the machine. For this reason, a segment with a bag is used in a place where a large tail void occurs, such as a sharp curve construction place.

  For example, as shown in FIGS. 4 and 5, the segment A with a bag includes a segment main body 1 formed in an arc shape along the ground surface of a tunnel excavation shaft, and an outer peripheral side of the segment main body 1. And a protective plate (protective body) 3 that is provided on the outer peripheral side of the segment body 1 so as to cover the bag body 2 and protects the bag body 2 (for example, Patent Document 1). Moreover, in this segment A with a bag, the segment main body 1 has a main girder plate 1a disposed on both sides in the width direction (both sides extending in the circumferential direction) and a circumferential direction ( The skin plate 1b extending in the arc direction), the joint plates 1c disposed at both ends in the circumferential direction of the main girder plate 1a and the skin plate 1b, and the circumferential direction between the main girder plate 1a and the skin plate 1b. And a plurality of vertical ribs 1d arranged in parallel at predetermined intervals.

  The bag body 2 is formed in a size along the outer peripheral surface 1e of the segment body 1 (the back surface of the skin plate 1b), and a base portion 2a fastened to the outer peripheral surface 1e with a bolt or the like, and the base portion 2a The bag member 2b is provided so as to have a slack on the outer peripheral side by sewing together. Further, the bag member 2b is formed to have a length along the arc-shaped outer peripheral surface 1e of the segment body 1, and the base portion 2a has a hole portion 5 corresponding to the injection hole 4 of the segment body 1 at the center thereof. It is formed in preparation. Further, on both sides of the outer peripheral surface 1e of the segment body 1, there are provided L-shaped locking portions 6 that project radially outward from the outer peripheral surface 1e and extend in the circumferential direction. A protective plate 3 having substantially the same length is attached with both end edges 3 a locked to the upper ends 6 a of the pair of locking portions 6.

A ring is constructed by connecting the segment A with a bag thus configured and a normal segment in a tunnel excavation tunnel excavated by a shield machine, and further connecting a plurality of rings in the axial direction of the tunnel excavation tunnel. By doing so, a cylindrical wall body is constructed. When the backing material S such as mortar is injected from the injection hole 4 of the segment main body 1 of the segment A with a bag at the stage where the cylindrical wall is constructed in this way, as shown in FIG. 6, the bag member of the bag 2 When the backing material S is injected into 2b, the bag member 2b gradually expands, and the protection plate 3 gradually bends along with this. Then, when the bag member 2b is further inflated by continuing the injection of the backing material S, both end edges 3a of the protective plate 3 are disengaged from the upper end 6a of the locking portion 6 as shown in FIG. Is pressed against the natural ground surface of the tunnel excavation mine. This prevents the backing material S from flowing into the shield machine even in places where a large tail void occurs, such as a sharply curved construction location, and the tail void is reliably blocked by the backing material S, and the skin is removed. The loosening of the ground due to is prevented.
Japanese Patent No. 3457647

  However, in the above-mentioned segment A with a bag, the protective plate 3 is only hooked on the upper end 6a of the L-shaped locking portion 6 formed on the outer peripheral side of the segment body 1 by locking the both end edges 3a. Therefore, the protective plate 3 slides in the extending direction (circumferential direction) of the locking portion 6 when the segment A with bag is moved and installed so as to construct a ring (cylindrical wall). There was a problem of moving. That is, as shown in FIG. 8, since the end portion of the L-shaped locking portion 6 is open, when the bag-attached segment A is inclined obliquely, the protective plate 3 is moved to the end portion of the locking portion 6 by its own weight. It slides so as to protrude outward (in the direction of arrow T), and the segment A with a bag cannot be installed so as to construct a ring suitably. For this reason, it is necessary to return the displaced protective plate 3 to the original position, and there is a problem that workability is deteriorated.

  Further, in the above-mentioned segment A with a bag, after being installed so as to construct a ring and a cylindrical wall body, as shown in FIG. 9, the outer peripheral surface of the cylindrical wall body (segment A with a bag) is shield machine M. The tail brush M1 passes while pressing while in contact. At this time, when the tail brush M1 provided on the protective plate 3 with one end fixed to the end portion on the inner peripheral surface side of the shield machine M passes. In addition, the protection plate 3 sinks downward due to the pressing force of the tail brush M1, which causes the tail brush M1 to fall. When the tail brush M1 falls in this way, one end of the tail brush M1 is caught by the engaging portion 6 on the front side in the excavation direction, and the engaging portion 6 is damaged or the shield machine M is suitably driven. The problem that it cannot be made arises.

In view of the circumstances described above, the present invention prevents the shift of the protective body and the breakage of the locking portion that locks the protective body so as to be able to sink and move in the circumferential direction, and to suitably perform the tunnel construction work. The aim is to provide a bagged segment that enables.

  In order to achieve the above object, the present invention provides the following means.

The segment with a bag of the present invention comprises a segment main body formed in an arc shape along a natural ground surface of a tunnel excavation mine, and a bag body attached to an outer peripheral side disposed on the natural ground surface side of the segment main body. A segment with a bag, provided on the outer peripheral side of the segment main body is provided with a plate-shaped protective body that covers and protects the bag body, and on both sides extending in the circumferential direction of the outer peripheral surface of the segment main body, extends in the circumferential direction with projecting from the outer peripheral surface radially outwardly, L-shaped cross section engaging the respective locking opposite edges of the movable Niso said to protect body can sink radially inward and circumferentially A stop portion is provided, and a support portion for restricting the movement of the protector in the circumferential direction is provided at a circumferential end portion of the outer peripheral surface of the segment body, and the support portion has an upper end at the engagement portion. Approximate radial direction relative to the upper end of the stop Or characterized in that it is formed to be disposed radially outward.

  In this invention, the protector that hooks and locks both ends on the upper end of the locking portion slides outward in the circumferential direction from the end portion of the locking portion by its own weight when the bag-attached segment is inclined obliquely. Even if it tries to move, the movement can be restricted by the support portion. Thereby, the protector does not shift like the conventional segment with a bag, and the trouble of returning the displaced protector to the original position can be eliminated.

  Further, since the support portion is provided in this manner, the tail brush can be brought into contact with the upper end of the support portion and can be slid on the support portion. As a result, it is possible to eliminate the fact that the protective body that is locked by hooking both ends to the upper end of the locking portion sinks downward by the tail brush and the tail brush falls.

In addition, since the upper end positions of the support part and the locking part are substantially the same position, or the upper end of the support part is arranged upward, the tail brush is reliably brought into contact with the upper end of the support part and slid. It is possible to reliably eliminate the tail brush drop.

  According to the segment with a bag of the present invention, since the shift of the protector can be prevented by providing the support portion, the workability of the installation can be improved, and the tail brush is hooked to the locking portion. It is possible to surely eliminate the damage of the machine or hinder the propulsion of the shield machine, and improve the workability of tunnel construction.

  Hereinafter, with reference to FIG.1 and FIG.2, the segment with a bag which concerns on one Embodiment of this invention is demonstrated. This embodiment relates to a segment with a bag including a bag body used when filling a tail void with a backing material in, for example, a shield method, and is particularly used in a place where a large tail void occurs such as a sharp curve construction place. It relates to a suitable bagged segment.

  As shown in FIG. 1, the segment B with a bag according to the present embodiment includes a segment main body 1 formed in an arc shape, a bag body 2 attached to the outer peripheral side of the segment main body 1, and an outer peripheral side of the segment main body 1. A protective plate (protective body) 3 that is provided so as to cover the bag body 2 and protects the bag body 2, a locking portion 10 that is provided on both sides of the outer peripheral surface of the segment body 1 and locks the protective plate 3, And a support portion 11 provided at an end portion of the outer peripheral surface 1e of the segment body 1 in the circumferential direction.

  The segment body 1 is formed in the same manner as the conventional segment A with a bag shown in FIGS. 4 and 5, and has a main girder plate 1a disposed on both sides in the width direction and a bridge between both main girder plates 1a. A predetermined interval is provided in the circumferential direction between the mounted skin plate 1b, the joint plates 1c disposed at both ends of the main beam plate 1a and the skin plate 1b in the circumferential direction, and the main beam plate 1a and the skin plate 1b. A plurality of juxtaposed vertical ribs 1d are provided.

  The bag body 2 is also formed in the same manner as the conventional segment A with a bag shown in FIGS. 4 and 5, and a base portion 2a fastened to the outer peripheral surface 1e with a bolt or the like, and the periphery of the base portion 2a And a bag member 2b provided with a slack on the outer peripheral side. In addition, the bag member 2b is formed in the bag shape which consists of cloth material which has air permeability, such as a civil engineering sheet.

  On the other hand, the locking portion 10 of the present embodiment is formed in an L shape and is provided on both sides of the outer peripheral surface 1e of the segment body 1 so as to protrude radially outward from the outer peripheral surface 1e and extend in the circumferential direction. . In addition, each locking portion 10 is formed such that the circumferential end portion 10 a is arranged slightly closer to the center side (circumferential center side) than the circumferential end portion of the segment body 1. The pair of locking portions 10 are, for example, equilateral angle steel, one end (lower end) is fixed to the skin plate 1b by welding or the like, and the other end on the upper end 10b side is arranged on the center side in the width direction of the segment body 1. It is formed to be. And the protection board 3 is provided so that the both ends edge 3a may be latched by the upper end 10b of a pair of latching | locking part 10, respectively, and the bag body 2 may be covered. Further, the protective plate 3 is formed with such a length that the circumferential end portion 3b is arranged at substantially the same circumferential position as the end portion 10a of the locking portion 10.

  The support portion 11 of the present embodiment is formed in a bar shape having a rectangular cross section, and protrudes radially outward from the outer peripheral surface 1e to the circumferential end (on the joint plate 1c) of the outer peripheral surface 1e of the segment body 1. And extends along the end of the outer peripheral surface 1e (the end of the segment body 1). Further, the support portion 11 is formed such that both ends 11 a are arranged at the same position in the width direction as the side ends in the width direction of the segment body 1. Further, the support portion 11 is formed such that its upper end 11b is arranged at substantially the same position in the radial direction with respect to the upper end 10b of the locking portion 10.

  Next, the action and effect of the segment B with a bag having the above-described configuration will be described.

  The segment B with a bag according to the present embodiment is held by the handling device and moved to the installation position by the handling device when the ring is constructed so as to cover the natural ground surface (inner surface) of the excavation mine excavated by the shield machine. However, at this time, in order to match the segment B with a bag with the installation position, the segment B is inclined or rotated. As shown in FIG. 8, when the bag is tilted in this manner, in the conventional bag-attached segment A, the protection plate 3 that is simply hooked and locked by the both end edges 3 a on the upper end 6 a of the locking portion 6, There was a problem that the weight would slide to the outer side in the circumferential direction than the end of the locking portion 6 due to its own weight.

  On the other hand, in the segment B with a bag of this embodiment, since the support part 11 is provided in the edge part of the circumferential direction of the outer peripheral surface 1e of the segment main body 1, it protects 3 by inclining diagonally or rotating. When slidably moves in the circumferential direction, the end 3 b of the protection plate 3 comes into contact with the side surface of the support 11. Thereby, since the movement of the protective plate 3 in the circumferential direction is restricted, the protective plate 3 is prevented from being displaced so as to protrude outward in the circumferential direction.

  Moreover, after installing the segment B with a bag so as to construct the ring and the cylindrical wall body, the outer peripheral surface of the cylindrical wall body (segment B with the bag) is pressed while the tail brush M1 of the shield machine M is in contact. As shown in FIG. 9, in the conventional segment A with a bag, the tail brush M1 provided on the protective plate 3 with one end fixed to the inner peripheral surface end of the shield machine M passes. In doing so, the protective plate 3 sinks downward by the pressing force of the tail brush M1, and the tail brush M1 falls. When the tail brush M1 falls in this way, one end of the tail brush M1 is caught on the engaging portion 6 on the front side in the digging direction, and the engaging portion 6 is damaged, or the shield machine M is preferably propelled. There was a problem that I could not.

  On the other hand, in the segment B with a bag of the present embodiment, the support portion 11 is provided at the circumferential end portion of the outer peripheral surface 1e of the segment body 1, and the upper end 11b of the support portion 11 is the locking portion 10. Since it is arranged at substantially the same position as the upper end 10b, as shown in FIG. 2, the tail brush M1 abuts on the upper end 11b of the support portion 11 and passes through the support portion 11 while sliding. As a result, the protection plate 3 locked by hooking the both end edges 3a to the upper end 10b of the locking portion 10 does not sink downward with the tail brush M1, and the tail brush M1 is prevented from falling.

  Therefore, in the segment B with a bag of this embodiment, since the movement in the circumferential direction of the protective plate 3 can be restricted by providing the support portion 11, the protective plate 3 is not displaced, and the conventional segment A with a bag is not. Thus, there is no need to return the displaced protective plate 3 to the original position, and the workability of the installation can be improved. Further, by providing the support portion 11, the drop of the tail brush M1 can be eliminated, and the tail brush M1 is caught with respect to the conventional segment A with a bag, causing the locking portion to be damaged, and the propulsion of the shield machine M is obstructed. It can be surely solved. Therefore, according to the segment B with a bag of this embodiment, the workability of tunnel construction can be improved.

  As mentioned above, although the segment with a bag which concerns on one Embodiment of this invention was demonstrated, the segment with a bag of this invention is not limited to said one Embodiment, It can change suitably in the range which does not deviate from the meaning. is there. For example, in the present embodiment, the support portion 11 is formed so that the upper end 11b of the support portion 11 is disposed at substantially the same position as the upper end 10b of the locking portion 10. The upper end 11b may be formed so as to be disposed above the upper end 10b of the locking portion 10. In this case, since the pressing force of the tail brush M1 acting on the locking portion 10 can be suppressed to a low level, the locking portion 10 can be reliably prevented from being damaged when the tail brush M1 passes.

  Further, in the present embodiment, the locking portion 10 is made of equilateral angle steel, and one end (lower end) is fixed to the skin plate 1b by welding or the like, but the locking portion 10 is, for example, As shown in FIG. 3, the segment main body 12 is made of square steel having a rectangular cross section that protrudes radially outward from the outer peripheral surface 1 e and extends in the circumferential direction. 1 and a plate-like locking member 13 formed so as to extend toward the center in the width direction, and may be formed in a substantially L shape. In the locking portion 10 formed in this way, the locking portion main body 12 is a square steel having a rectangular cross section compared to the angle steel of the present embodiment, so that the joining area with the segment main body 1 is increased and stable. In this state, it can be integrally formed, and can be more reliably prevented from being damaged by the pressing force acting when the tail brush M1 passes.

It is a perspective view which shows the segment with a bag which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which the tail brush has passed on the segment with a bag which concerns on one Embodiment of this invention. It is sectional drawing which shows the modification of the segment with a bag which concerns on one Embodiment of this invention. It is a perspective view which shows the segment main body of the conventional segment with a bag. It is sectional drawing of the conventional segment with a bag. It is sectional drawing which shows the state which is inject | pouring the backing material into the bag body of the conventional segment with a bag. It is sectional drawing which inject | pours a backing material into the bag body of the conventional segment with a bag, and shows the state which the latching of the protection board and the latching | locking part was cancelled | released. It is the figure used in order to demonstrate that a shift | offset | difference arises in a protection board when installing the conventional segment with a bag. It is the figure used in order to demonstrate that a tail brush falls when a tail brush passes on the conventional segment with a bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment main body 1a Main girder plate 1b Skin plate 1c Joint plate 1d Vertical rib 1e Outer peripheral surface 2 Bag body 2a Base part 2b Bag member 3 Protection plate (protection body)
3a Edge 3b End 4 Injection hole 5 Hole 6 Locking part 6a Upper end 10 Locking part 10a End part 10b Upper end 11 Support part 11a End part 11b Upper end A Conventional segment B with bag Segment M with bag Shield machine M1 Tail Brush S Backing material

Claims (1)

A segment with a bag comprising a segment main body formed in an arc shape along a natural ground surface of a tunnel excavation mine, and a bag attached to an outer peripheral side arranged on the natural ground surface side of the segment main body,
On the outer peripheral side of the segment body, a plate-shaped protection body that covers and protects the bag body is provided,
On both sides extending in the circumferential direction of the outer peripheral surface of the segment body, the protective body can be sunk inward in the radial direction and can move in the circumferential direction by projecting radially outward from the outer peripheral surface and extending in the circumferential direction. the locking portion of the L-shaped cross section of each locking both edges of Niso is provided,
A support portion for restricting movement of the protector in the circumferential direction is provided at a circumferential end portion of the outer peripheral surface of the segment body , and the upper end of the support portion is in a radial direction with respect to the upper end of the locking portion. A segment with a bag, which is formed so as to be arranged at substantially the same position or radially outside .

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