★Tunnel - kākoʻo pili uwea kila a me nā paneli hoʻoikaika ʻia PP.
★ʻO nā pani puka - kākoʻo kila me nā mea kākoʻo i waiho ʻia ma FRP.
★Ka hoomalu 'akomi i na puka kaawale i loko o ka tunnel.
★ʻO ka hana ʻana o ka mea hoʻoheheʻe waikika hale kiaʻi e hoʻokumu i kahi kaomi maikaʻi ʻole i loko o ka tunnel, ʻo ka noe waika i hana ʻia e ka holoi ʻakika e paʻa i loko o ka tunnel a ʻaʻole hiki i ka noe waika ke pakele mai ka tunnel.
★ʻAʻohe ohu waika ka hale hana hana, e pale ana i nā mea hana a me ke ʻano hale.
★ʻO luna me ke kukui anti-corrosion;
★Ka hoʻomalu kaomi ʻino.
★ʻO luna o ka tunnel me ka lōʻihi sealing strip (PP flexible sheet);
★Hoʻokaʻawale ʻia ka tunnel i kekahi mau ʻāpana kaʻina ma o nā puka ʻakomi e piʻi a hāʻule.
★ʻO ka ʻaoʻao waho o ka tunnel me ka puka noe waika, i hoʻopili ʻia i ka ʻauwaha hale kiaʻi noe;
★ʻO ka puka makani nānā ma ka ʻaoʻao o ka tunnel ma ka ʻili hana.