20Ton of undug pipe laying drill

Introduction of 20 tons of unexcavated pipe laying rig

In the case of a very small part of the surface excavation (generally a small area of the inlet and outlet), the new construction technology of laying, replacing and repairing various underground pipelines has little interference to the surface, so it has a higher socio-economic effect.The 20 ton pipe laying drill mainly includes horizontal directional drilling, pipe jacking, micro-tunnel, pipe blasting, impact and other technical methods.

Technical parameters of 20 ton pipe laying drill

Power (kw) : 110 (cummins)

Output torque (Nm) : 7000

Borehole feed (KN) : 200

Borehole towing force (KN) : 200

Output speed (RPM) : 0-140

Angle of incidence (°) : 8-25

Drill pipe specifications (mm) : 73 * 3000

Host weight (Kg) : 7600

What is the cause of trenchless rig sticking?

After sticking accidents in recent years for some processing and analysis, the preliminary determination of the main causes of sticking with the following aspects:

A, in the process of drilling and improve, large area of hole wall collapse and cause the hole, the bit to both positive and negative transfer, also cannot be mentioned.This kind of situation in its density is not too big sand pebble or flow sand layer occurs more easily.

Second, due to the operator during drilling operation, a footage is too deep, cause the reducing of hole wall, the gap between the a bit wall and wall of hole and cause sticking.The situation in clay loam or sand clay loam easy to occur.

Three, bit teeth, lateral teeth wear serious, cannot assure hole diameter size requirements, make no clearance between tube outer wall and wall of hole drill, drilling deep and cause at the same time.

Four gap size, drill pipe, in the process of construction, small gap cause talus deposit formed between drill pipe sticking.

Five, due to accidental factors, such as drilling wire rope fracture or promotion process, joint activities (universal) collapse or the machine itself, there have been some other failure (such as engine doesn't work, jump out of the wire rope pulley groove, etc) to make work suddenly stopped, and processing is not timely, bit in the bottom of the hole for a long time, causing a bit wall around too much sediment or reducing of hole wall.

The following methods:

A, direct lifting method: is applying pressure or hydraulic jack up directly with the crane.According to the experience of a construction site in Beijing, sticking within 72 h, 45 t crane in 4, plus the drill main winding tension is can solve the problem itself.

Around two, bit dredging method: using reverse circulation or reverse circulation principle of gas lift (make the tube produces air water mixture with high pressure pumps and pressure difference to form the loop), methods of underwater cutting, cleaning up around the drill Jane sediment, reduce wall and pore wall friction, then with the rig and ancillary equipment items.This method is more difficult operation, not easy to use.

Liners, the three, excavation method and protecting: with cement or other items, and protecting the drainage hole wall, directly with artificial excavation, clean up around the drill cylinder sediment, this method is limited to drill into the card is not used in deep formation.