求翻译：设置在隧道进出口Ⅴ级围岩地段，并配合混凝土套拱施工，对围岩进行注浆加固，以便安全进洞。管棚钢管均采用热轧无缝钢管，环向间距40-50厘米。是什么意思？

Set the import and export Ⅴ grade rock in the tunnel sections, and with the construction of concrete arch units, grouting the surrounding rock in order to secure the hole. Hot-rolled steel pipe roof are used seamless steel pipe, circumferential spacing 40-50 cm.

Set in a tunnel of import and export V level rock lots, concrete set tie in with the construction of the rock to note pulp, in order to reinforce security hole. hot-rolled steel scaffolding tubes are used to seamless steel tubes, central spaced 40 - 50 centimetres.

Establishes at the tunnel import and exportⅤThe level adjacent formation land sector, and coordinates the concrete set of arch construction, carries on the note thick liquid reinforcement to the adjacent formation, in order to enter the hole safely.The tube awning steel pipe uses the hot rolling sea

Settings import/export v-class surrounding rock in tunnel sites, together with the concrete arch construction, on surrounding rock Grouting reinforcement so that security entrance. Tube awning steel pipe is seamless, hoop space 40-50 cm.

Establishes at the tunnel import and exportⅤThe level adjacent formation land sector, and coordinates the concrete set of arch construction, carries on the note thick liquid reinforcement to the adjacent formation, in order to enter the hole safely.The tube awning steel pipe uses the hot rolling sea