Introduction of Construction Methods
(low noise and vibration method)
As its main material, high-strength wear-proof special steel (1200kg/cm2) to be applicable to cast-in-place pile with large diameter ranging from 1000mm to 2000mm. And it is a protrusion-type openable hammerer grab.
Currently we can see various types of hammer grab as drilling grabs for "cast-in-place pile method." However, environments around construction sites have become increasingly harsh.
So we offer you our newly developed clam-shell-type hammer grab which can solve the both of two problems of "noise and vibration" especially at downtown and residential zones.
Also you can use this instead of conventional hammer grab for main excavation and obstacle-removal tasks in the conventional All Casing(BENOTO) method.
Characteristics of clam shell grab
By removing crown and crown head which were the noise source of conventional hammer grab, excavation work with low noise is achieved.
With conventional hammer crabs, we have needed to drop a hammer from a height of a certain degree to do excavation works.
When it is fallen by its own weight, vibration occurred. But, our newly developed hammer grab does not require height for falling to do excavation work.
The biggest advantage of clamshell grab is its low vibration and noise at the time of excavation work compared to those caused by conventional hammer grabs.
If you need to change the machine's weight for underwater drilling or as required, you can easily change the weight.
Also, as for both aspects of its price and maintenance, compared to conventional hammer grabs, it needs lower cost and its number of parts is fewer. So its running cost is less than the conventional ones.
※Since it does not use any hydraulic oil and the like, you do not need to worry about underground water contamination.