JPH11324582A - Segment with bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a bag body when a back-fill material is filled into a tail void (clearance) formed between a cylindrical wall body and an excavated hole at the time of excavation of a tunnel by a shield machine. SOLUTION: A tail seal of a shield machine moves along an outer face of a cover plate 6 covering a bag body 2. Consequently, the bag body 2 does not come into contact with the tail seal directly and its breakage and twist are prevented so that it inflates normally at all times. When grout is filled into the bag body 2 from a socket 1e to inflate the bag body 2, the cover plate 6 comes off the bag body 2 to inflate and deform the bag body 2 freely when an inflation and deformation force of the bag body 2 is stronger than an adhesion force of an adhesion means 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in filling a backing material into a tail void (gap) formed between a cylindrical wall and an excavation hole during excavation of a tunnel by a shield excavator. For bagged segments.

[0002]

2. Description of the Related Art In order to quickly and accurately fill a tail void generated in a shield method with a backing material and to prevent loosening of the ground due to ground fall, as shown in FIG. A segment Sa with a bag having a bag 22 attached to the outer peripheral surface has been developed.

The bagged segments Sa are connected in a ring shape in the circumferential direction in the excavation hole H to form a cylindrical wall Ra, and are formed in the segment body 21 in the bag 22 of each bagged segment Sa. The grout g is injected and filled from the filled injection hole 21a to expand the bag body 22 between the ground G and the cylindrical wall body Ra, so that the bag body 22 extends in the direction of excavation of the excavation hole H so as to cross the tail void V. Use with partitioning.

[0004] For this reason, the backing material is injected into the tail void V between the cylindrical wall body Rb and the ground G formed by the ordinary segment Sb without the bag body 22, and the backing material to the shield excavator is used. It can be carried out accurately at high pressure by preventing outflow of water.
In addition, the tail void V becomes large in the curved portion of the tunnel.

[0005]

By the way, the shield excavator is provided with a tail seal on the tail portion of the outer cylinder, and the tail seal is brought into contact with the outer surfaces of the cylindrical walls Ra and Rb to thereby form the cylindrical wall Ra. , Rb and the ground G are excavated. Therefore, the bag 22 of the segment Sa is rubbed by the tail seal when the shield excavator advances.

There is no problem if the tail seal moves only by rubbing the bag 22 with the designed force. However, the strength of the bag may be weak or the bag 22 may be removed for some reason.
If the bag body 22 is rubbed with an abnormally strong force by the tail seal, there is a concern that the bag body 22 may be damaged or twisted and may not be inflated normally.

[0007] It is an object of the present invention to provide a segment with a bag, in which the bag is less likely to be damaged or twisted. Another object of the present invention is to provide a bag-equipped segment that can inflate a bag body in a predetermined state without hindrance.

[0008]

In order to achieve at least one of the above objects, the invention according to claim 1 is characterized in that a grout is provided on an outer peripheral surface of a segment body which is connected in a ring shape in a circumferential direction in a drilled hole. In a bag-equipped segment to which a bag body that is inflated between the segment body and the ground due to filling is attached, the bag body is fixed to the segment body in a surrounding frame provided on the outer peripheral surface of the segment body. Then, it was configured to be freely foldable.

In this configuration, since the surrounding frame touches the tail seal of the shield excavator and receives most of the force applied by the movement of the tail seal, the frictional force of the tail seal applied to the bag is reduced. For this reason, the damage and twist of the bag due to the movement of the tail seal are reduced.

According to a second aspect of the present invention, in the bag-equipped segment according to the first aspect, the bag body is fixed to the segment main body via a soft sheet, and a cover plate is provided at the free end of the soft sheet in the surrounding frame. The folded bag body is detachably attached by an attaching means while covering the outer surface of the bag body.

According to this configuration, the cover plate prevents the tail seal from contacting the bag body. Therefore,
Breakage and twisting of the bag due to a tail seal or the like are more reliably prevented. When the grout is filled in the bag, the bag becomes
The cover plate is inflated by pushing the cover plate outward, and at this time, the attaching means separates the cover plate from the bag with the expansion and deformation of the bag, and allows the bag to expand freely.

According to a third aspect of the present invention, in the segment with the bag according to the first aspect, a cover plate is detachably fitted to the surrounding frame.

In this configuration, the lid plate prevents the tail seal from contacting the bag. Therefore, also in this case, breakage or twisting of the bag due to the tail seal or the like is reliably prevented. When the bag is filled with grout and the bag is inflated, the inflation force causes the lid to be detached from the surrounding frame, so that the bag can be freely expanded outward.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In these figures, reference numeral 1 denotes a segment body. In the segment body 1, an outer plate (skin plate) 1c is welded to the outer end surfaces of the main girder plates 1a, 1a and the joint plates 1b, 1b welded in a long shape, and a frame 1d is formed on the outer surface of the outer plate 1c. At the same time as welding, a cylindrical grout socket 1e is attached to the inner surface of the outer plate 1c so as to communicate with an injection hole 1f formed in the outer plate 1c, and is vertically attached to the main girder plates 1a, 1a and the outer plate 1c. 1g of rib
It is manufactured by welding.

The front face of the segment body 1 in the thickness direction is long and the side face is arc-shaped. The main girder plate 1a, the joint plate 1b, the outer plate 1c, the surrounding frame 1d, and the grout socket 1 constituting the segment main body 1.
e, the vertical rib 1g is made of metal such as steel. A plug 1h having a screw structure that is screwed into a screw hole of the grout socket 1e to close the socket 1e is inserted into the grout socket 1e.
Is attached. The grout socket 1e is usually attached to the outer panel 1c by welding (FIG. 3) or bolts (FIGS. 4 and 5).

Reference numeral 2 denotes a bag. The bag 2 is made of a reinforced cloth having water permeability, and a soft sheet 3 of vinyl tarpaulin or the like is provided on the outer peripheral surface of the outer plate 1c of the segment body 1.
And can be folded in the surrounding frame 1d. Generally, a bolt or a tack and an adhesive are used for the fixing means 5. The bag 2 can be overlaid on the soft sheet 3 as shown in FIG. 3 and attached to the outer panel 1c with fixing means 5, or as shown in FIG. May be attached to the outer panel 1c.

The length of the free end 3a of the soft sheet 3 is the
The height of the cover plate 6 is sufficiently larger than the height d, and the cover plate 6 is detachably attached to the free end 3a by the attaching means 7. The cover plate 6 covers the outer surface of the bag body 2 folded in the enclosure 1d, and is made of a wear-resistant metal plate of steel or the like according to the outer shape of the open end of the enclosure 1d. .

The attaching means 7 keeps the cover plate 6 adhered to prevent falling off when the tubular wall is constructed or transported by the segment S with the bag, and when the bag 2 is inflated, the cover plate 6 is attached to the bag. The cover plate 6 is separated from the bag body 2 with an appropriate force so as to separate the bag body 2 from expansion deformation.
Adhered to. As the attaching means 7, a velvet fastener is usually used, but a metal fitting such as a tack having a small strength can be used.

The thickness t of the bagged segment S from the inner edge of the main girder plate 1a to the outer surface of the cover plate 6 (FIG. 3)
Is usually equal to the thickness of a normal segment without the bag 2.

The segment S with a bag configured as described above.
In the same manner as in the prior art, a cylindrical wall body Ra is connected circumferentially in an excavation hole H (see FIG. 8) to form a cylindrical wall body Ra, which passes through a tail seal provided on an outer cylindrical body of a shield excavator. Then, grout g is filled into the bag body 2 of each bagged segment S from the grout socket 1e of the segment main body 1 through the injection hole 1f, and the bag body 2 is formed into the tail void V between the ground G and the cylindrical wall body R. Inflate. Then, a backing material is injected between the bags 2 and 2 as in the conventional case.

When the tail seal passes through the bag 2 during the excavation movement of the shield excavator, the tail seal moves along the outer surface of the cover plate 6 covering the bag 2. Accordingly, the bag body 2 is not directly rubbed by touching the tail seal, and is prevented from being damaged or twisted, so that the bag body 2 always expands normally. Bag 2 that functions as described above
When the inflation force of the bag body 2 is greater than the adhesion force of the attachment means 7 during the inflation operation of the bag body 2, the cover plate 6, which has been prevented from being damaged, is detached from the bag body 2 and inflated and deformed Free.

After filling the grout g into the bag 2 and inflating the bag 2, the grout socket 1e is connected to the plug 1h.
Seal with.

FIG. 7 shows another embodiment of the present invention.
In this embodiment, a cover plate 10 is used instead of the cover plate.
Is used. The cover plate 10 is made of a wear-resistant metal plate such as steel, and is detachably fitted to the open end of the enclosure 1d. The top surface 2a of the bag 2 is formed of a soft sheet such as vinyl tarpaulin. Other structures are shown in FIGS.
It is identical to the bagged segment of FIG.

In the case of the segment S with a bag, the cover plate 10 protects the bag 2 against the movement of the tail seal of the shield excavator. The cover plate 10 is detached from the surrounding frame 1d by the pressure when the bag body 2 is inflated, so that the bag body 2 can be freely expanded. Therefore, also in the bag-equipped segment S, breakage or twisting of the bag body 2 due to a tail seal or the like is prevented, and the bag body 2 can be inflated accurately.

In the above segment with a bag, the cover plate 6 and the cover plate 10 can be omitted. In this case, since the surrounding frame 1d receives most of the force applied by the tail seal and reduces the frictional force of the tail seal against the bag 2, the damage and twist of the bag 2 are alleviated.

Although the surrounding frame 1d in the figure is continuous in a long shape, a part thereof may be cut off. The shape of the segment in the thickness direction can be variously changed, for example, a trapezoid at a curved portion of the tunnel or the like, and is not limited to a long shape. The invention can also be applied to hexagonal segments. It is possible to use the bag 2 of FIG. 7 for the segment S with a bag of FIGS. 1 to 6, and to use the bag 2 of FIG. 1 to FIG. 6 for the segment with a bag of FIG. The present invention is also applicable to concrete segments.

[0027]

As described above, in the bagged segment according to the first aspect, the bag body is protected by the surrounding frame, and the friction of the tail seal of the shield excavator is reduced, so that the breakage and twisting are reduced. This has the effect of being able to always inflate accurately.

According to the segment with the bag according to the second or third aspect, the bag is more securely protected by the cover plate or the cover plate, and is not damaged or twisted by touching the tail seal. In addition, since the used cover plate or cover plate is detached from the bag or the surrounding frame by the expansion force of the bag, the expansion of the bag is not hindered by the cover plate or the cover plate.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a segment with a bag according to the present invention.

FIG. 2 is a view of the bagged segment of FIG. 1 as viewed from below.

FIG. 3 is a sectional view taken along the line (III-III) of FIG. 2;

FIG. 4 is a longitudinal sectional view of a main part showing an inflated state of the bag body.

FIG. 5 is a view of the segment main body of FIG. 4 as viewed from below.

FIG. 6 is a cross-sectional view showing an inflated state of the bag.

FIG. 7 is a cross-sectional view showing another embodiment of a segment with a bag.

FIG. 8 is a cross-sectional view of a conventional segment with a bag.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Segment main body 1d Surrounding frame 2 Bag 3 Soft sheet 3a Free end 5 Fixing means 6 Cover plate 7 Attachment means 10 Cover plate S Segment with bag

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichiro Ota 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawajima Building Materials Industry Co., Ltd. (72) Inventor Yasushi Nagashima 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd.

Claims (3)

[Claims] 1. A bag having a bag attached to an outer peripheral surface of a segment body connected in a ring shape in a circumferential direction in a drilling hole, the bag body being inflated between the segment body and the ground by filling with grout. The segment with a bag, wherein the bag is fixed to the segment main body and foldable in an enclosure provided on an outer peripheral surface of the segment main body. 2. The bag body is fixed to the segment body via a soft sheet, and is detachable by an attaching means in a state where a cover plate covers an outer surface of the bag body folded in the surrounding frame at a free end of the soft sheet. The segment with a bag according to claim 1, wherein the segment is attached to a bag. 3. The segment with a bag according to claim 1, wherein a lid plate is detachably fitted to the surrounding frame.