Trenchless technology revealed: hole expansion construction in one shot
Автор: mianxiwei
Загружено: 2025-07-26
Просмотров: 44053
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✅【Construction scenario】
Directional drilling and hole expansion construction is often used in underground crossing projects, such as crossing roads, rivers, railways or under buildings, and pipeline laying is completed without excavating the surface. During construction, a pilot hole is first drilled, and then the hole diameter is gradually expanded by the back-expanding drill bit, and finally the pipeline is pulled through.
✅【Key process flow】
1️⃣ Guided drilling: A small diameter drill bit drills a guide hole along the designed route.
2️⃣ Hole expansion operation: Replace the hole expansion drill bit and expand the hole diameter by back-pulling.
3️⃣ Pipeline traction: Pull the pipeline into the expanded hole under the lubrication of mud.
4️⃣ Mud circulation: Use mud to cool the drill bit, discharge slag, and stabilize the hole wall, which is key.
✅【Technical highlights】
🌀 Trenchless construction: The surface is not disturbed, suitable for densely populated urban areas.
🛠️ Multiple hole expansion: Expand from a small hole to the target diameter step by step, with strong control.
🚧 Adapt to complex strata: sand layer, pebble layer, clay, etc.
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