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Trenchless-engineering case

  • Time of issue:2013-11-26

Trenchless-engineering case

(Summary description)The side crossing project is located on the west side of Dongming Bridge in Zhongshan City.

  • Time of issue:2013-11-26
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The side crossing project is located on the west side of Dongming Bridge in Zhongshan City. The crossing location is selected on the river side of Dongming Bridge, 38m away from the buttress of the South Bank Bridge, the width between the two banks of the river embankment is 112m, and the water depth is 5m. As the water level of the Shiqi River is affected by the high tide and low tide, the channel needs to be navigable normally and cannot be closed. Therefore, the project adopts directional drilling technology to cross the gas pipeline in a trenchless way. The project is a φ273×9 steel pipe crossing with a length of approximately 280m. The maximum crossing depth: 10m below the natural ground; the drilling rig entry point is located on the Henan side, and the excavation point is located on the Hebei side. The entry angle is 10°, the excavation angle is 6°, and the drilling radius of curvature is 488m. The project is a small-scale crossing. The directional drilling technology has the advantages of relatively low cost, short construction period, and no obstruction to traffic. With the continuous improvement of the technology, this construction technology has begun to be widely used in the pipeline gas, tap water, power and telecommunications sectors. Now the above example introduces its specific operation process and precautions. (2) Compilation basis ① "Code for Construction and Acceptance of Oil and Gas Pipeline Line Engineering" SY0401—98; ② "Technical Specification for Horizontal Directional Drilling Pipeline Laying Engineering" CSTT; ③ "Code for Construction and Acceptance of Oil and Gas Pipeline Crossing Engineering" SY /T4079-2003; ④"Code for Construction and Acceptance of Long-distance Pipeline Engineering" SYJ4001-98; ⑤"Code for Design of Crude Oil and Natural Gas Transmission Pipeline Crossing Engineering" SY/170015.1-98; ⑥"Design of Gas Pipeline Engineering Specification" GB50251-94;

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