Vibro System is demonstrated

Title

Language

English

Source

The Marsman Magazine Volume II (No. II) May 1938

Year

1938

Rights

In Copyright - Educational Use Permitted

Fulltext

The tube having been driven, the steel reinforcement is lowered into it (ab01.1e left), the concrete is poured into the tube ( cente'i'), the pile is poured and the extraction of the tube is started (right). Vibro System Is Demonstrated About a hundred prominent government officials, engineers of the Bureau of Public Works in Manila, construction engineers, architects and contractors witnessed the first public demonstration of the Vibro Concrete Pile System, conducted near the Marsman Building in the Port Area on Saturday, May 14. Considerable interest was shown by those who saw the pile driven under the supervision of Mr. H. D. S. Page, Manila representative of The Vibro Piling The boiler for the Vibro machine is raised (below) Company, Limited, concessionaires for Hongkong and South China. Almost every country in the world has adopted the system, and there are more1 than 50 machines in constant use. T HE V ibro process is based on correct engineering principles, and ensures the formation of a pile consist-· ing of dense, compressed concrete which has not been subjected to any driving stresses and which is able to carry its. load without risk of settlement. The derrick is pulled erect by its own boiler (below) and is about to go into place (left picture). Part of the audience which attended the demonstration. Mr. Mo, rsman is shown in front 0 f the group with Mayor Juan Posadas of Maniln. A.f ter the dem o n s t r a tion breakfast was served under the shelter shown in the background. Vibro piles are generally formed by driving a steel tube fitted with a conkal cast iron shoe into the ground: until the desired set is obtained. The tube is then filled with concrete and is extracted by a succession of upward extracting and downward tamping blows; the lower end of the tube is enlarged to form a tamping rim, so that. each downward blow rams the concrete outwards firmly against the, surrounding earth and keys the pile securely into the ground. The finished pile! cannot be smaller than the outside diameter of the tamping rim. The ordinary Vibro pile is suitable for practically every type of foundation and nearly all ground conditions; there' are, however, modifications of the standard Vibro system which are particuT~e extxracting links being lowf-red preparatory to the starti'r1 ,g of operations (below) larly suitable when ground of low bearing value is encountered for a considerable depth. The plant required for the formation of Vibro piles is simple to operate, and can be employed without alteration not only for standard Vibro piles, but alsa for any modified type that it may be found necessary to employ. The rapidity with which Vibro piles are formed; compares very favourably with other systems or with pre-cast piles .. Vibro piles have been extracted for €Xamination from time to time ; every one has always, been found to be of the full section and consisting of perfect concrete. Numerous loading tests, have: been made, and in no case has the Vibro pile failed to carry its load with an adequate factor of safety. L o w e r in g th•? tube on to the cast iron pile sh o. e (below), and the start of driving the tub!! (left)

Media