The concept of bored pile drilling machine:
Bored pile drilling machine is a type of construction equipment used to create bored piles in the construction technology of concrete or cement mortar (i.e. taking soil up from the ground to form a hole. digging) by drilling method.
Bored pile drilling machine
Basically, the bored pile drilling machine has 3 types as follows:
Bored pile drilling machine (twisted way): when drilling into the ground, the drilling blades work like wood or steel drill bits, push land up through twisted wings. There is also a drill for chicken intestines consisting of multiple drills, a cage cage that is twisted together and lined up in a row (3 bits), used to drill to form barrette piles and a diaphragm wall to reinforce the foundation (the diaphragm wall created with this device has the form of row of circular cross-sections planted overlapping and successive). The bored piles are suitable for drilling many different types of bored piles, of which the most typical are four types:
-Bored piles are piles constructed by different drilling methods (bucket drilling, backwashing drilling, … ).
-The bottom expansion bored pile is a type of bored pile with the diameter of the bottom of the pile larger than the diameter of the pile body.
-Barrette piles have a non-circular cross-section with many different cross-sections, this is one of the commonly used bored piles in Vietnam.
-Bored piles with washing erosion and bottom reinforced cement mortar pump are bored piles that apply bottom wash technology and bottom reinforced cement mortar pump. These are the development steps in bored pile construction technology.
Bored pile drilling machine (bucket type): when working, the bucket rotates according to the drill rod, cuts the soil, filled the digging bin, then the soil in the digging bin is brought up with the digging bin by drawing the lever drill up.
Reverse circulation pump bored pile drilling machine: the ship’s propeller blade (ie the propeller type) drills into the soil by attaching to the head of the drill, which is the pump pipes, which rotate. After the soil has been reduced to drilled humus, it is pumped with a large capacity pump, pumped onto the ground with the solution kept on the wall of the hole through the drilling line.
Bored pile drilling machine illustration
In terms of structure, the drilling barrel type bored pile drilling machine includes the system of drilling rod (shaft) and the head of the drill (bucket). This entire system is usually mounted on a crawler crane weighing about 30 to 80 T, mainly using a hydraulic motor called a processing bull head drill.
For standard machines such as BAUER, there are many types of bored pile drilling machines, but popular in Vietnam are using the above mast drill, this machine drills for good quality bored piles, can drill large piles machines cannot drill, and can drill rocks at high solid intensity.
Bauer BG40 bored pile drilling machine
In terms of structure, the drilling barrel type bored pile drilling machine includes the system of drilling rod (shaft) and the head of the drill (bucket). This entire system is usually mounted on a crawler crane weighing about 30 to 80 T, mainly using a hydraulic motor called a processing bull head drill. The drill rod is made of steel consisting of 3 to 5 interlocking sections like an antenna column, the length of the rod is from 12m to 18m. When drilling the inner segments protrude themselves until all 5 segments are drilled, the drilling depth ranges from 30m to 64m. Drill rod includes two types of friction rod and lock lever. For each geological type that uses these levers. Typically the drill series BAUER BG46. Bauer BG46 is one of the most modern bored pile drilling machines currently in the industrial construction drilling machine market developed and manufactured by Bauer Group from Germany.
Drum-shaped drums have diameters from 600mm to 3,000mm or more. The types of bored pile drilling machines used in Vietnam are listed as HITACHI, NIPON, SUMITOMO, etc., manufactured by Japan for crawler cranes.
HITACHI KH250HD – 65T
Currently, with the large projects requiring high technology and good pile quality, many units have used higher technology mast drills, the ability to drill larger diameters and drill geothermal sites. most machines cannot be drilled. As one of the leading foundation construction companies in Vietnam with a brand that has been affirmed through hundreds of large and small projects at home and abroad, leading in mechanical capacity and technological equipment, DUAFAT confidently assures ensure progress – improve the quality, bring the image of the project to a new level, meet all requirements and increase benefits for the investor … honor to be selected to become the main construction contractor especially in the category of bored piles of the project. Therefore, Duafat has put into use the Bauer bored pile drill, the specialized drilling machine for large projects originating from Germany.
Refer to some types of bored pile drilling machines at DUAFAT used for foundation construction:
Drilling diameter: 3,700 mm
Drilling depth: 126,0 m
Torque: 553 kNm
Engine power: 570 hp
Max. Height: 36.6 m
Overall height: 12.6m
Trench length: 2,800 mm
Tail [High handlebar]: 100 mm
Maximum torque: 91 kNm
Rotation speed: 0-25 U / min