JP3307724B2 - Lining method of shield tunnel where internal pressure acts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining a shield tunnel in which an internal pressure of a liquid or the like flowing through the inside of a tunnel, such as a water supply, a headrace, or a storage pipe, acts.

[0002]

2. Description of the Related Art Conventionally, as a method of lining a shield tunnel to which internal pressure acts, a concrete tunnel is constructed by sequentially assembling concrete segment rings, and then a steel pipe is drawn into the tunnel, and a gap is formed between the segment ring and the steel pipe. A construction method in which a filler such as mortar is injected to integrate the steel pipe is adopted.

[0003]

In the conventional steel pipe drawing method described above, since the weight and length of the steel pipe are large, the work of drawing into the shield tunnel and the work of installing the same through the spacer are not easy, and furthermore, the filling operation is difficult. There is a drawback in that it requires a lot of construction time and cost because the work of pouring the material is required.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, a shield to be constructed by welding a plurality of arc-shaped iron plates at a tail portion of a shield body 1 as needed while excavating by a shield machine. An iron pipe body 2 corresponding to the outer diameter of the tunnel is prepared, and a plurality of large and small main segments 3 and key segments 4 formed into an arc-shaped wedge shape with concrete are assembled inside the iron pipe body 2, and the key segments 4 are sharpened. The iron pipe 2 is pressed from its inner surface by expanding the entire diameter of the segment ring 5 and press-fitting the segment ring 5 to the iron pipe 2 while introducing prestress thereto. The present invention proposes a method of lining a shield tunnel in which an integrated internal pressure acts.

[0005]

The pre-stress is introduced into the iron pipe 2 by integrating the segment ring 5 and the iron pipe 2 on the outer periphery thereof.
A shield tunnel having a sufficient pressure resistance against the internal pressure is formed.

Since the iron tube 2 can be made by assembling an arc-shaped iron plate in the shield main body 1, it is extremely easy to manufacture and install it, and it is possible to manufacture it in parallel with excavation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS While excavating with a shield machine, a plurality of arc-shaped iron plates are appropriately welded at a tail portion of a shield body 1 to form an iron tube 2 corresponding to the outer diameter of a shield tunnel to be constructed. Inside 2, a segment ring 5 is sequentially assembled by a plurality of large and small main segments 3 and key segments 4 formed into an arc wedge shape with concrete, and these are pressed against the inner peripheral surface of the iron pipe body 2 to integrate them.

The key segment 4 is formed to be considerably narrower and slightly smaller in depth than the main segment 3, and the joint surfaces of the segments 3 and 4 are provided with concave and convex joints 6 and 7 which mesh with each other.

At the time of assembling the segment ring 5, the key segments 4 are arranged at a plurality of positions between the wide main segments 3 and 3, and the key segments 4 are appropriately pushed toward the sharp tip end thereof. The entire diameter of the segment ring 5 is expanded to press the iron tube 2 from its inner surface,
The segment ring 5 is pressed into contact with the iron tube 2 while introducing prestress into the iron tube 2 and integrated.

[0010] The iron tube 2 is formed sequentially according to the assembly progress of the segment ring 5, and the front and rear iron tubes 2, 2 are welded together to be integrated.

A gap formed between the front and rear segment rings 5 and 5 before and after the key segment 4 is filled with a filling material 8 such as mortar.

[0012]

As described above, according to the present invention, the segment ring is integrated with the iron pipe on the outer periphery thereof, and a prestress is introduced into the iron pipe, so that the shield tunnel having a sufficient pressure resistance against the internal pressure. Can be configured.

Since the iron tube can be made by assembling an arc-shaped iron plate in the shield body, it is extremely easy to manufacture and install, and it can be manufactured in a short time in parallel with the excavation. It is possible to reduce the construction period and construction cost as a lining method.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view showing a construction mode of the present invention.

FIG. 2 is a front view of a shield tunnel constructed according to the present invention.

FIG. 3 is a cross-sectional plan view of the shield tunnel constructed according to the present invention.

FIG. 4 is a perspective view of a main segment used in the present invention.

FIG. 5 is a perspective view of a key segment used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Iron pipe 3 Main segment 4 Key segment 5 Segment ring 6 Irregular joint 7 Irregular joint 8 Filling material

Continuation of the front page (56) References JP-A-5-25991 (JP, A) JP-A-6-221097 (JP, A) Japanese Utility Model Showa 55-47569 (JP, U) JP-B-48-37291 (JP, A) , B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 11/08

Claims (1)

(57) [Claims] 1. A plurality of arc-shaped iron plates are appropriately welded at a tail portion of a shield main body while excavating by a shield machine, and an iron pipe body corresponding to an outer diameter of a shield tunnel to be constructed is prepared. A plurality of large and small main segments and key segments formed in a circular arc wedge shape from concrete are assembled inside, and the key segments are appropriately pushed toward the sharp tip end direction, whereby the entire segment ring is enlarged to increase the diameter of the iron pipe body. A method of lining a shield tunnel in which an internal pressure acts, wherein a pressure is applied from its inner surface to introduce a prestress into the iron pipe body and press and integrate a segment ring therewith.