Patent GB-771037-A (GB)
Title: A method and a device for pile driving by means of a self-propelled pile driver
IPC: E02D7/16
Filed: 1955-06-21
Abstract: 771,037. Pile driving. AKTIEBOLAGET LANDSVERK. June 21, 1955 [June 30, 1954], No. 17842/55. Class 68 (2). In pile driving by means of a self-propelled pile driver in the form of a swinging crane having a crane housing 2 with a winch pivotable on the undercarriage of a motor driven wheel or tracked vehicle 1 and having a crane jib 4 adjustable in length and swingable about a horizontal shaft 3 and a pile driving frame 10 suspended therefrom so as to be articulated and having a ram 16 guided in the frame 10, the pile 33 is raised, its lower end fixed in the hole 32 where it is to be driven into the ground, the frame 10, held raised from the ground, is moved together with the pile 33 and lowered until it rests with its lower end on the ground over the hole 32, the length of the crane jib 4 then being adjusted to bring the upper end of the frame 10 over the hole 32 so that the frame acts as ground support for the crane jib while the pile 33 is driven into the ground by the ram 16. The frame 10 is suspended from a shaft 11 in an angular bracket 9 secured to a bar 6 longitudinally displaceable within a tubular guide, 5 built into the upper end of the main jib 4, the bar 6 being pivoted at its inner end to the rod 7 of the piston of a hydraulic servo motor cylinder 8 housed in the jib 4 but operable by the crane operator in his place in the housing 2. The bar 6 can therefore be displaced to and retained in any extended position. To avoid bending stresses, the bar 6 may be mounted to turn in the guide 5, the bracket 9 to turn about the bar 6 and the frame 10 provided with a gimbal mounting. The pile driving frame 10 is of channel section open to the front and comprises spaced front and rear pipes 13, 15 connected by a number of clamps 14 and ending in a base plate 12 for support against the ground. A pile pad 17, disposed over the upper end of the pile to protect it, and the ram 16 are guided in the frame, the pad 17 being connected to the ram 16 by a pair of hasps 18 which can be suspended from a pair of hooks in recesses in the ram, automatically released when the ram is lowered relatively to the pad. Cable winches 21, 22, 23 in the housing 2 are used to operate a cable 24 for the jib 4, a cable 25 for the ram 16 via pulleys 26, 27 on the bracket 9 and a cable 28 over a pulley 29 on the top of the frame 10 for securing to the pile 33. The cable 28 is first passed round a sheave 35 (not shown), secured adjacent the lower end of frame 10 which rests on the ground and is then secured at 36 to one pile 33 of a stack of piles 30 and the pile dragged to a position adjacent the crane. The sheave 35 is then removed and the pile 33 hoisted as in Fig. 2 and the frame 10 lifted from the ground. The end of the pile 33 is then directed into the hole 32, dug where the pile is to be driven in ; the lower end of the frame 10 directed to lie over the hole so that the pile 33 is within the frame and the frame lowered till the plate 12 rests on the ground and the crane jib extended or retracted as necessary to position the frame 10 vertically or at the desired angle, and the pile is then driven by the ram 16, the pad 17 remaining on the top of the pile after the first fall of the ram 16.