The Working Characteristics Of The Crawler Mounted Drill Rig
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As a new type of basic engineering machinery, Crawler Mounted Drill Rig has been widely used in pile foundation projects such as roads and railways, bridges, water conservancy projects and urban construction projects after several years of promotion and application. Due to its high efficiency, energy saving, low noise, low pollution, and wide adaptability of the formation, it is favored by more and more construction units. Effectively use the rotary drilling rig to carry out dry-drilling bored pile construction and dry-drilling bored pile construction technology and management specifications, and conduct basic discussion and induction.
Construction method features:
1. During drilling, the hydraulic cylinder on the drill rail slide can be pressed downward to speed up the drilling speed.
2. This drilling method is to drive various drilling tools into holes through the box type torsion drill collar and rotary power head. The full hydraulic crawler crane with retractable track is convenient for moving and positioning.
3. The weight of the equipment, the power configuration of the whole machine and the output capacity of the main actuator are large, which meets the construction needs of special projects in certain special fields. Adapt to the reality that the construction of the project is more difficult, and the quality and efficiency requirements are constantly improving.
4. The operation and control of the equipment adopt electromechanical and hydraulic integration, which improves the reliability of operation and flexibility of operation. For example, the automatic display system for automatically measuring the skew of the computer has a great effect on improving the hole forming efficiency and the hole forming precision.
5. The telescopic active drill pipe greatly reduces the auxiliary working time, and it can also create conditions for timely replacement of the applicable drill bit type according to the formation change.
6. Less mud discharge is beneficial to the protection of the environment.
7. the spoil is convenient, the excavated soil residue, the car can be directly transported away, reducing the muddy on the site.
8. directly excavation, automatic dumping. There is no need to manually cooperate to open the bucket door.
9. lifting drills, casings, etc. do not need to cooperate with the crane.
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Rotary drilling
Soft rock Significant depths up to 5,000 metersCore drilling
All soil types Drilling for soil analysis
Contact us to discuss your requirements of Crawler Mounted Pneumatic Tophammer Drill Rig. Our experienced sales team can help you identify the options that best suit your needs.
Rotary drilling: This type of drilling digs a hole by grinding the rock with a tool under the effect of weight and rotation. It is mainly used in oil production. The cuttings are brought to the surface under the pressure of a drilling fluid that is injected into the drill string. Drilling fluid also helps consolidate the walls of the borehole, so it is not necessary to case it as the operation progresses.
Down-the-hole drilling (rotary percussion drilling or rotary hammer drilling): this type of drilling uses drilling rigs that drill with a rotary cutter (drill head) and hammer the bottom of the hole with a pneumatic hammer. The excavated material rises to the surface under the pressure of the compressed air used for the hammer. These drilling rigs are powerful and have high drilling rates, especially in rock. For artesian wells (wells where water naturally rises to the surface under groundwater pressure) or geothermal drilling, an air injection at the end of the drill pipe pushes the water up the borehole, allowing the operator to immediately determine the water flow encountered. This type of drilling is used for hard and cracked ground up to 4,000 meters deep. When the drilling bit is eccentric, the drilling can be done with a casing advancement system (installation of tubes by gravity) which reinforces the hole as the drilling progresses.
Top hammer drilling: this type of drilling uses drilling rigs that also operate on a percussion system, but one that remains outside the borehole. They are mainly used for small diameter drilling, for example for mineral exploration or the installation of tie rods in rock. This system is used for shallow boreholes, as there can be significant deviation due to the structure of the ground drilled through. These drilling rigs can operate in any direction however.
Auger boring: This is a type of rotary drilling using a worm screw (the auger). This type of drilling is mainly used for unconsolidated clay or sand terrain. The excavated material is directly brought to the surface by the worm screw. For deep drilling, it may be necessary to regularly raise the auger to empty it of its excavated material.
Core drilling: Core drilling is similar to rotary drilling, but it uses a crown to extract a sample, called a core, inside the tool.
Percussion drilling: consists in breaking the rock by dropping a tool, the drill bit, by gravity. This type of drilling can only be used vertically. To prevent the borehole from collapsing, it is necessary to case it as it is drilled. The cuttings are reassembled as soon as they interfere with drilling by replacing the drill bit with a flap valve bailer. The flap valve bailer is a type of tube equipped with a tilting flap in the lower part. This tilting flap allows the tube to be filled with excavated material which is then transported to the surface.
Pipe jacking: is mainly used to install horizontal pipes. The tube is pushed progressively by percussion, the excavated material being removed at the end of the drilling operation either by water injection or with an auger. This technique is used in particular to avoid transmitting vibrations to the surrounding buildings or to avoid digging a trench.
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