共きょう同どう溝こう

きょ

う

ど

う

こ

う

Meanings

multipurpose underground utility conduit; common utility duct

Civil engineering term for an underground tunnel housing multiple utilities such as water, gas, electricity, and telecommunications lines.

Common utility ducts are important facilities that protect urban lifelines.

新あたらしい共きょう同どう溝こうの建けん設せつが始はじまった。

Construction of a new multipurpose underground utility conduit has begun.

電でん線せん共きょう同どう溝こう
A specific type of 共同溝 designed primarily for electric power and communication cables, often installed under roads to eliminate utility poles.
ライフライン
Refers broadly to lifeline utilities (water, gas, electricity, communications); 共同溝 is the physical infrastructure that houses them.

Compound of 共同 (kyōdō, 'joint, common') and 溝 (kō, 'ditch, trench'). The term describes a shared underground conduit for multiple utilities.