<progress id="c6wt7"><u id="c6wt7"></u></progress>
      <track id="c6wt7"></track><strong id="c6wt7"></strong>

      <span id="c6wt7"><sup id="c6wt7"></sup></span><span id="c6wt7"><output id="c6wt7"><b id="c6wt7"></b></output></span>

          <legend id="c6wt7"><li id="c6wt7"></li></legend>

          <sub id="c6wt7"><sup id="c6wt7"></sup></sub>

        1. 21
          2019
          09

          超高分子量聚乙烯隧道逃生管道的鏈接和應用

          超高分子量聚乙烯隧道逃生管道的鏈接和應用 ①超高分子量聚乙烯隧道逃生管道所用管材采用Φ800mm的超高分子量聚乙烯管道,管節長度為3m,壁厚30mm,超高分子量聚乙烯隧道逃生管道可采用環型抱箍連接、鋼制搭接鎖扣連接,U型卡鏈扣連接,每端連接10mm固定。為保證管道承受坍塌體的壓力,對采用的材質管材,必須確保其承壓能力和連接頭的牢固,并經試驗室具體試驗后,方可用于隧道中。     ②施工現場應根據隧道圍巖、掘進開挖方式等情況備足管道和連接材料,除整節管道外,
          ?? 1 ??
          嫩草在线_日韩专区在线观看_制服丝袜在线_午夜不卡伦在线观看
          <progress id="c6wt7"><u id="c6wt7"></u></progress>
              <track id="c6wt7"></track><strong id="c6wt7"></strong>

              <span id="c6wt7"><sup id="c6wt7"></sup></span><span id="c6wt7"><output id="c6wt7"><b id="c6wt7"></b></output></span>

                  <legend id="c6wt7"><li id="c6wt7"></li></legend>

                  <sub id="c6wt7"><sup id="c6wt7"></sup></sub>