JP2551082B2 - Lining method in shield method - Google Patents

Description

The present invention relates to a lining method in a shield method.

[Prior Art] Conventionally, the primary lining of a tunnel excavated by the shield construction method is to push a plurality of concrete or metal linings inside the shield tail after pushing the shield body into the ground with a jack for propulsion. It is common practice to assemble the application segment by bolting or the like, and then fill the space between the segment and the ground by injection of backfill material. However, in the case of using such a segment, it takes a lot of time to assemble a plurality of segments by joining them by bolts or the like, and the construction cost is high.

In order to solve such a problem, a cylindrical formwork is installed inside the tail part of the shield main body having a push jack having a push ring, and is defined by the push ring, the tail part formwork and the existing lining part. A liquid lining material is injected into the formed void, and before the lining material is cured, the propulsion jack is operated to advance the shield body, and then the propulsion jack is operated to push the push ring. To move forward, at the same time as or before or after the push ring to move the mold to be adjacent to the push ring, thereby installing a plurality of ring-shaped supports to reinforce the demolded lining material. Japanese Patent Publication No. 56-2200 proposes a lining method for constructing a primary lining by casting the liquid lining material.

[Problems to be Solved by the Invention] In the above-mentioned conventional technique, it takes time and effort to assemble and dispose a mold for casting the liquid lining material,
There was a problem that the construction cost was high.

Therefore, an object of the present invention is to provide a lining method in a shield construction method in which lining is easy.

[Means for Solving the Problems] The lining method in the shield construction method of the present invention is to arrange a ring-shaped bag body having an appropriate shape containing at least one of a frame bone and a filament fiber inside the tail portion of the shield body. A liquid lining material is injected into the bag, and the lining material is hardened by curing the lining material, and at least one of the frame bone and the filament fiber, and a lining part in which the bag is integrated. It is designed to be formed.

[Operation] By the above method, the primary lining portion is formed by injecting the liquid lining material into the bag body. Therefore, it becomes easy to assemble the formwork required for cast-in-place, and work such as movement is eliminated. At least one of the frame bone and the filamentous fiber in the bag body can maintain the shape of the bag body or durability against external pressure.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 7, the shield body 1 has a plurality of propulsion jacks 3 attached to a tail skin 2 which is a tail portion inside thereof, and a rod 4 of each jack 3
A push ring 5 is provided at the rear end. This propulsion jack 3 is in a state where the shield body 1 has completed the stepwise advancement in FIG. In this state, the ring-shaped bag body 6 having an appropriate shape, for example, a circular shape, is arranged inside the tail skin 2 of the shield body 1. The bag body 6 is formed of a water-proof cloth or resin, and a frame bone 7 for retaining its shape is provided inside, and the applicant has proposed it in Japanese Patent Laid-Open No. 176725/1985. As described above, the opposite surfaces of the bag body 6 are connected by the thread-shaped fibers 8 arranged in a substantially uniform crossing state. In this case, the frame bones 7 are formed in a semicircular shape so that the bag body 6 can be folded into two, for example, and are connected to each other via a shaft support portion 7A. Further, the bag body 6 is provided with an injection part 9.
Further, a front surface portion 6B having a convex surface 6A is provided on the front side of the bag body 6, and an opening portion 6C is provided on the rear surface side.
Further, the receiving frame 10 is detachably connected so as to be positioned inside the bag body 6.

Next, a quick hardening grout 11 which is a liquid lining material is injected into the bag body 6 through the injection part 9 by a pump (not shown), and after the quick hardening grout 11 is cured, a reaction force is applied to the quick hardening grout 11. Accordingly, the propulsion jack 3 is operated to advance the shield body 1 and contract the rod 4. In this case, the concave surface 11A is formed on the hardened fast-hardening grout 11. This process is repeated to carry out the lining, and when carrying out the next lining, the bag body 6 of the lining portion 12 and the bag bodies 6 to be arranged next are packed 13 etc. as shown in FIG. Connect through. Then, the lining portion 12 in which the bag body 6, the frame bone 7, and the thread-shaped fiber 8 are hardened is integrated by the hardened grout 11 is continuously formed.

As described above, in the above embodiment, the bag body 6 is arranged inside the tail skin 2 of the shield body 1, the rapid hardening grout 11 is injected and hardened in the bag body 6, and the shield body is operated by the operation of the propulsion jack 3. By advancing 1
It becomes easy to assemble a complicated formwork for cast-in-place, and the lining portion 12 can be formed easily and quickly without the need for movement or the like. In this case, the frame 6 and the thread-shaped fiber 8 are provided in the bag body 6.
Since the shape of the bag body 6 can be maintained because it is provided, and the filament fiber 8 is solidified in a state where prestress is introduced by the injection of the rapid hardening grout 11 by the pump, the earth pressure applied after the lining is applied. It is possible to sufficiently withstand external forces such as water pressure and water pressure, and the connected bag body 6 provides a water blocking effect. Furthermore, since the bag body 6 can be moved in the hole in the folded state and placed at a predetermined position, it is possible to perform lining in the hole having a smaller diameter than before. In addition, lining in the bending direction is possible by appropriately selecting the shape of the folded bag.

The present invention is not limited to the above embodiment,
Various modifications can be made within the scope of the present invention, and the material and shape of the bag body and the frame bone may be appropriately selected, and the liquid lining material may be appropriately selected. For example, the frame bones 7 may be folded into two or more pieces, or the lining portion 12 may be formed continuously with the front surface portion 6B removed as shown in FIGS. 8 (A) and 8 (B). Alternatively, as shown in FIG. 9, a closed bag body 6 having a closed rear surface may be used. The front surface portion 6B may be a flat surface without providing the convex surface 6A.
Further, the shape of the push ring 5 may be made to fit into the concave surface 11A.

EFFECTS OF THE INVENTION The present invention provides a ring-shaped bag body having at least one of a frame bone and a thread fiber inside the tail portion of the shield body, and a liquid-shaped covering material inside the bag body. Is injected, and the lining material is cured to form a lining portion in which the lining material, at least one of the frame bone and the thread-like fiber, and the bag body are integrated to facilitate lining. A lining method in the shield method can be provided.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic explanatory view showing a lining state, FIG. 2 is a sectional view of a bag body, and FIG. 3 is A- in FIG. A line sectional view, FIG. 4 is a sectional view showing a lining state, FIGS. 5 to 7 are sectional views of a main part showing a lining order, FIGS. 8 (A) (B) and FIG. 9 are It is sectional drawing which shows another Example. 1 ... Shield body 2 ... Tail skin (tail part) 6 ... Bag body 7 ... Frame bone 8 ... Thread fiber 11 ... Hard-speed grout (lining material)

Claims (1)

(57) [Claims] 1. A ring-shaped bag body having at least one of a frame bone and a filament fiber is provided inside a tail portion of a shield body, and a liquid lining material is injected into the bag body. A lining method in a shield construction method, characterized by forming a lining portion in which the lining material, at least one of the frame bone and the filament fiber, and the bag body are integrated by curing the lining material.