Iyo culvert corrugated board yekugadzira mutsara ndeye yakakosha midziyo ye culvert corrugated board compression molding, iyo inoshandiswa zvakanyanya muindasitiri yekuvaka uye zvimwe zvivakwa, zvinosanganisira njanji bhiriji tunnel, nzira dzebhiriji nzira nezvimwe.