hollow pipe

基本解釋

The water and soil separation net plate is matched above the hollow pipe;
一水土分隔網(wǎng)板，系配置于上述空心管之上方；
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The sanitary clearer has the advantage that only the original solid draw rod needs to be substituted by the hollow pipe, and the purpose of water saving can be achieved.
只需將原有的實(shí)心拉桿用空心管替代就可達(dá)到節(jié)水目的。
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The valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. When drilling pipe is taken out and concrete grout is injected, the valve will be opened.
螺旋鉆頭底部閥門防止鉆進(jìn)過程中鉆屑進(jìn)入到空心的混凝土管中，當(dāng)鉆桿提出同時(shí)混凝土漿注入時(shí)，鉆桿底部的閥門將被打開。