Detecting device for striking speed of pile hammer

Abstract

Abstract PURPOSE:To improve reliability by detecting a striking speed from output signals of three ram passing detection switches in total provided in the height direction of a ram. CONSTITUTION:A proximity switch 10a for ram passing detection is provided to a casing 1 a little bit above the upper end of the ram 3 when the ram 3 is placed on a pile 8, another proximity switch 10b for ram passing detection is provided above the switch 10a across a slight gap, and further another proximity switch 10c for ram passing detection is provided slightly above the switch 10b. Then, a computing element 11 for a speed V calculates the striking speed V from a specific equation by using up/down gaps of those switches 10a, 10b, and 10c and differences in time when the respective switches 10a, 10b, and 10c detect the passing of the upper end of the ram 3, and the falling speed V of the ram 3 right before the ram 3 strikes the pile 8 is calculated as the striking speed; and the falling height H corresponding to a natural fall is calculated 12 from a specific equation by using the speed V and gravitational acceleration read out of a register 13, so that the speed V and falling height H are displayed 28.

Inventors

• 👤 Toru Uchino
• 👤 徹 内野
• 👤 Sakae Fukai
• 👤 深井　栄

Bibliographic Details