News

• Jun / 22

  2023

  Cautions of using ventilation duct

  Cautions of using ventilation duct: 1.The duct with different size should be selected according to the specific circumstances underground. 2.The duct should be hoisted to straight,and should make every ring forced uniformly to avoid the weight concentrated in part rings. 3.The duct should be regularly checked ,timely repair of damaged can prolong its use life. ​

• May / 22

  2023

  The Risk Of Fire In Tunnel Construction

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