JP3973756B2 - Segment with bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment with a bag suitable for use in filling a back void material into a tail void (gap) formed between a tubular wall body and a drilling hole during tunnel excavation by a shield excavator.
[0002]
[Prior art]
In order to quickly and accurately fill the tail void generated in the shield construction method and prevent loosening of the ground due to skin peeling of the natural ground, as shown in FIG. A segment Sa with a bag 22 is developed.
[0003]
The segment Sa with a bag is connected in a ring shape in the circumferential direction within the excavation hole H to form a cylindrical wall body Ra, and an injection formed in the segment body 21 in the bag body 22 of each segment Sa with a bag. Grouting g is injected and filled from the hole 21a to inflate the bag body 22 between the natural ground G and the cylindrical wall body Ra and partition the bag body 22 in the excavation direction of the excavation hole H so as to cross the tail void V. use.
[0004]
For this reason, injection of the backing material into the tail void V between the cylindrical wall body Rb constructed with the normal segment Sb without the bag body 22 and the natural ground G, and outflow of the backing material into the shield excavator This can be done accurately at high pressure. The tail void V becomes large in the curved part of the tunnel.
[0005]
[Problems to be solved by the invention]
By the way, the shield excavator is provided with a tail seal at the tail portion of the outer cylindrical body, and the tail seal is brought into contact with the outer surface of the cylindrical wall bodies Ra and Rb so that the gap between the cylindrical wall bodies Ra and Rb and the natural ground G is obtained. We dig in the state that was blocked. Accordingly, the bag body 22 of the segment Sa is rubbed with the tail seal when the shield excavator is excavated.
[0006]
If the tail seal moves only by rubbing the bag body 22 with the designed force, there is no problem. However, the strength of the bag body is weak or the bag body 22 is abnormally caused by the tail seal for some reason. If it is rubbed with a strong force, there is a concern that the bag body 22 may be damaged or twisted and cannot be normally expanded.
[0007]
An object of this invention is to provide the segment with a bag which a bag body is hard to be damaged or twisted.
Another object of the present invention is to provide a bag-attached segment that can inflate a bag body into a predetermined state without any trouble.
[0008]
[Means for Solving the Problems]
In order to achieve at least one of the above objects, the invention according to claim 1 is characterized in that the segment main body and the natural ground are filled by grout filling the outer peripheral surface of the segment main body connected in a ring shape in the circumferential direction within the excavation hole. In a segment with a bag to which a bag body to be inflated is attached, the bag body is fixed to the segment body via a flexible sheet in a surrounding frame provided on the outer peripheral surface of the segment body, and can be folded freely together provided, characterized in that it is removably attached by attachment means in the cover plate to the free end covers the outer surface of the bag folded into the surrounding frame of the soft sheet.
[0009]
In this configuration, since the 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 body is reduced. For this reason, the breakage and twist of the bag body accompanying the movement of the tail seal are alleviated.
Moreover, the cover plate prevents the tail seal from contacting the bag body. Therefore, breakage or twist due to the tail seal or the like of the bag body can be prevented more reliably. When the bag body is filled with grout, the bag body expands by pushing the cover plate outward. At this time, the attaching means separates the cover plate from the bag body as the bag body expands and deforms, and the bag body expands. To free.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
In these drawings, reference numeral 1 denotes a segment body. The segment main body 1 has a main plate 1a, 1a and a joint plate 1b, 1b welded in a long shape, and an outer surface plate (skin plate) 1c is welded to an outer end surface of the joint plate 1b, 1b. While welding, a cylindrical grout socket 1e is attached to the inner surface of the outer surface plate 1c in communication with an injection hole 1f formed in the outer surface plate 1c, and is vertically attached to the main beam plates 1a, 1a and the outer surface plate 1c. The rib 1g is manufactured by welding.
[0015]
The front shape of the segment body 1 viewed in the thickness direction is a long shape, and the side shape is an arc shape. The main girder plate 1a, the joint plate 1b, the outer surface plate 1c, the surrounding frame 1d, the grouting socket 1e, and the vertical rib 1g constituting the segment body 1 are made of metal such as steel. The grout socket 1e is provided with a screw-type plug 1h that is screwed into the screw hole of the grout socket 1e to close the socket 1e. The grout socket 1e is normally attached to the outer surface plate 1c by welding (FIG. 3) or bolts (FIGS. 4 and 5).
[0016]
Reference numeral 2 denotes a bag. The bag body 2 is made of a water-permeable reinforced cloth, and is fixed to the outer peripheral surface of the outer surface plate 1c of the segment body 1 by a fixing means 5 via a soft sheet 3 such as vinyl tarpaulin, and is folded in the surrounding frame 1d. Be able to. For the fixing means 5, bolts or scissors and an adhesive are generally used. The bag body 2 is overlapped with the soft sheet 3 as shown in FIG. 3 and attached to the outer surface plate 1c by the fixing means 5, or is sewn to the soft sheet 3 as shown in FIG. May be attached to the outer surface plate 1c.
[0017]
The length of the free end 3a of the soft sheet 3 is made sufficiently larger than the height of the surrounding frame 1d, 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 surrounding frame 1d, and is made of a metal plate such as wear-resistant steel in accordance with the outer shape of the opening end of the surrounding frame 1d. .
[0018]
The adhering means 7 keeps the cover plate 6 attached and prevents the cover plate 6 from falling off when the cylindrical wall body is constructed or transported by the segment S with the main bag, and the cover plate 6 is separated from the bag body 2 when the bag body 2 is inflated. Then, the cover plate 6 is attached to the bag body 2 with an appropriate force that allows the bag body 2 to freely expand and deform. As the attaching means 7, a velvet fastener is usually used, but a metal fitting such as a heel having a low strength can be used.
[0019]
The thickness t (FIG. 3) of the segment S with bag from the inner edge of the main beam plate 1a to the outer surface of the cover plate 6 is usually equal to the thickness of a normal segment that does not have the bag body 2.
[0020]
The segment S with a bag having the above-described configuration is connected in a ring shape in the circumferential direction within the excavation hole H (see FIG. 8) to form a cylindrical wall body Ra, and is outside the shield excavator. After passing through the tail seal provided in the cylinder, the grout g is filled into the bag body 2 of each segment S with a bag from the grout socket 1e of the segment body 1 through the injection hole 1f. Inflate into a tail void V between the cylindrical walls R. And a backing material is inject | poured between the bag bodies 2 and 2 similarly to the past.
[0021]
As described above, when the tail seal passes the portion of the bag body 2 by excavation movement of the shield excavator, the tail seal moves along the outer surface of the cover plate 6 covering the bag body 2. Therefore, the bag body 2 does not directly rub against the tail seal and is prevented from being damaged or twisted, so that it always expands normally. The cover plate 6 that functions as described above and prevents the bag body 2 from being damaged, etc., when the expansion deformation force of the bag body 2 becomes larger than the adhesion force of the attachment means 7 during the expansion operation of the bag body 2. 2 to free the expansion deformation of the bag body 2.
[0022]
After the bag body 2 is filled with grout g and the bag body 2 is inflated, the grout socket 1e is sealed with a plug 1h.
[0023]
FIG. 7 shows another embodiment of the present invention. In this embodiment, a cover plate 10 is used instead of the cover plate. The lid plate 10 is made of a metal plate such as wear-resistant steel and is detachably fitted to the opening end of the surrounding frame 1d. The top surface 2a of the bag body 2 is formed of a soft sheet such as vinyl tarpaulin. The other structure is the same as the bagged segment of FIGS.
[0024]
In the case of this segment S with a bag, the cover plate 10 protects the bag body 2 against the movement of the tail seal of the shield excavator. The cover plate 10 is removed from the surrounding frame 1d by the pressure when the bag body 2 is inflated, so that the bag body 2 is freely inflated. Accordingly, also in the segment S with bags, the bag body 2 is prevented from being damaged or twisted by a tail seal or the like, and the bag body 2 can be inflated accurately.
[0025]
In the above segment with 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 body 2, damage and twisting of the bag body 2 are alleviated.
[0026]
Although the surrounding frame 1d 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 trapezoidal shape at a bent portion of the tunnel, and is not limited to a long shape. The present invention can also be applied to hexagonal segments. The bag body 2 of FIG. 7 can be used for the segment S with bags of FIGS. 1 to 6, and the bag body 2 of FIGS. 1 to 6 can be used for the segment with bags of FIG. 7. The present invention can also be applied to concrete segments.
[0027]
【The invention's effect】
As described above, in the bag-attached segment according to claim 1, 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 the twist are alleviated. , There is an effect that can always be accurately inflated.
[0028]
Further, the bag body is more reliably protected by the cover plate, and is not damaged or twisted by touching the tail seal. Moreover, the cover plate after obsolete because disengaged by inflation force of the bag from the bag body or the surrounding frame, never inflation of the bag body thus be inhibited to the cover plate.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a bag-attached segment according to the present invention.
FIG. 2 is a view of the segment with bag of FIG. 1 as viewed from below.
3 is a cross-sectional view taken along line (III-III) in FIG.
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 body.
FIG. 7 is a cross-sectional view showing another embodiment of a bagged segment.
FIG. 8 is a cross-sectional view of a conventional bagged segment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Segment main body 1d Surrounding frame 2 Bag body 3 Soft sheet 3a Free end 5 Fixing means 6 Cover plate 7 Adhering means 10 Cover plate S Segment with bag

Claims (1)

In the segment with the bag in which the bag body that is inflated between the segment body and the ground by the filling of the grout is attached to the outer peripheral surface of the segment body that is connected in a ring shape in the circumferential direction within the excavation hole,
The receptacle is fixed to the segment body through the soft sheet together is disposed foldably in surrounding frame, which is provided on the outer peripheral surface of the segment body, the cover plate is the circumference at the free end of the soft sheet A segment with a bag, which is detachably attached by an attaching means while covering an outer surface of a bag body folded in a frame.

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