JPH072795Y2 - Existing tunnel lining structure - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] The present invention, for example, when an existing horseshoe-shaped tunnel used as a waterway for water supply, industrial water supply, agricultural water supply, water supply for hydroelectric power generation, sewerage, etc. is deteriorated, It concerns the lining structure to be repaired.

[0002]

2. Description of the Related Art Conventionally, as a means for repairing an existing tunnel that has deteriorated, for example, for waterways, a steel bottom lining repair material and a steel upper lining repair material are assembled along the inner peripheral surface of the existing tunnel. Japanese Patent Application Laid-Open No. HEI-1 is a Japanese Patent Application Laid-Open No. HEI-1.
-97724.

[0003]

By the way, the outer surface of the lining repair material is unpainted, or even if it is painted, the vicinity of the weld is unpainted, or even if the outer surface is entirely painted, Since the coating film near the weld is burned out by the welding heat and it is difficult to evenly coat the outer surface of the lining repair material with the grout material, There is a problem that the material is locally corroded and the life of the lining repair material is shortened.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the gist of the present invention is to make a steel inner pipe installed along the inner peripheral surface of an existing tunnel. Attach a required number of galvanic anodes to the outer surface of the tension repair material in advance, assemble this steel lining repair material into the existing tunnel and weld it together, and create a gap between the existing tunnel and the steel lining repair material. It is in the lining structure of an existing tunnel filled with grout material.

[0005]

As described above, according to the present invention, by attaching a required number of galvanic anodes to the outer surface of the steel lining repair material installed along the inner peripheral surface of the existing tunnel, the leakage from the galvanic anodes can be prevented. Corrosion protection current flows into the unpainted part on the outer surface of the steel lining repair material or the defective part of the coating film through water as an electrolyte or grout material. It is possible to prevent local corrosion in a defective portion of the film.

[0006]

1 and 2, 1 is an existing tunnel for a horseshoe-shaped waterway to be repaired, 2 is a steel lining repair material installed along the inner peripheral surface of the existing tunnel 1, This lining repair material 2 comprises a bottom lining repair material 2a and an upper lining repair material 2b.
And are welded together at the weld line 2c.

A required number of galvanic anodes 3 are preliminarily attached to the outer surface of the steel lining repair material 2, and mortar or concrete is placed in the gap between the existing tunnel 1 and the steel lining repair material 2. Are filled with grout material 4.

[0008]

[Effects of the Invention] As in the present invention, a steel lining repair material having a required number of galvanic anodes is installed on the outer surface along the inner peripheral surface of the existing tunnel to repair the existing tunnel and steel lining. Since the grout material is filled in the gap with the material, the anticorrosion current flowing out from the galvanic anode is passed through water as the electrolyte or the grout material to the unpainted part on the outer surface of the steel lined repair material or the defective part of the coating film. It is possible to prevent local corrosion in the unpainted portion of the outer surface of the steel lining repair material, the defective portion of the coating film, and the like, and therefore, the life of the steel lining repair material can be remarkably extended.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is an end view of FIG.

[Explanation of symbols]

 1 Existing tunnel for horseshoe-shaped waterway 2 Steel lining repair material 2a Bottom lining repair material 2b Top lining repair material 2c Welding line 3 Galvanic anode 4 Grout material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location E21D 11/00 A 7635-2D F16L 1/00 P (56) Reference JP-A-1-97724 ( JP, A-JP-A 1-263395 (JP, A) JP-A 61-31599 (JP, A) JP-A 63-201297 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A required number of galvanic anodes are previously attached to the outer surface of a steel lining repair material installed along the inner peripheral surface of an existing tunnel, and the steel lining repair material is installed in the existing tunnel. The lining structure of the existing tunnel, which is assembled and welded together and filled with grout material in the gap between the existing tunnel and the steel lining repair material.