ʻO ka hana o ka welding chambered kākalaioa ma luna o ke kino paipu e pale aku i ke komo ʻana o ke one a i ʻole nā ​​mea ʻē aʻe mai ka pale ʻana i ka lua grouting.

ʻO ka paipu pua kila he ʻano kaʻina hana i ka tunneling a me ke kaʻina hana o ka papahana hoʻokele slope support. Hoʻohana nui ʻia ia no ka ʻāpana haʻihaʻi nāwaliwali, ʻāpana kanu pāpaʻu, ʻo ka ʻāpana ʻokiʻoki o ke komo ʻana o ke ana, ʻāpana one, one, a me ka ʻāpana ʻiliʻili i ka wā hoʻopaʻa ponoʻī. Palena uku mua no nā wahi e like me nā ʻāpana haʻi hewa.

ʻO ka paipu pua kila he ʻano hana kōkua maikaʻi loa me ka ʻole o ka ʻeli ʻana o ka maka hana. I ke kūkulu ʻia ʻana o nā ʻano pōhaku nāwaliwali a haki, hiki i nā kahawai liʻiliʻi alakaʻi ke hoʻoikaika i nā ʻano pōhaku wehe. Ma hope o ka grouting, hoʻonui ʻia ka paʻa o nā pōhaku ākea a nāwaliwali a puni, he mea pono i ke kūkulu ʻana i ka pōhaku a puni ma hope o ka pau ʻana o ka ʻeli ʻana a i ka wā o ke kākoʻo mua ʻAʻole ia e haunaele, a ʻaʻole e nalowale ka pōhaku a puni. a hāʻule paha.