Cakar Ayam

A foundation construction specifically created for conditions where the soil  is soft, mushy, or swampy areas. Cakar ayam (chicken feet) foundation consists of concrete boards (slab) with concrete pipes beneath molded into a single unit, without any joints. This construction was created by prof. Dr. Ir. Sedyatmo in 1961. The idea stems from the root fibers of the palm tree that can hold the trees upright against fairly strong wind near the coast, even though the land on the coast consists of soil that is soft and swampy. First applied to the high voltage transmission poles in Ancol, Jakarta.

This construction became a subject of heated debates from building construction experts in Indonesia, because its construction was not supported by detailed scientific calculations. However, its application had been implemented in many places, among others, Juanda Airport apron, Soekarno-Hatta Airport runways, Jakarta Cengkareng toll road foundations. For other constructions, this foundation has been applied to the Bank of Indonesia building foundation in Pekanbaru, swimming pools in Surabaya and Samarinda, and others.

The advantage of this construction is that it's cost is more economical than other types of foundations. Very suitable for the type of land in Jakarta, building a foundation for a four storey building only requires pillar piling foundation with a length of  20-25 m, using cakar ayam foundation can reduce the costs by about 30%. Cakar ayam can be applied to all kinds of soil, except hard rock and hard soil. It is more suitable for use on marshy ground.