Sosrobahu

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Sosrobahu" – news · newspapers · books · scholar · JSTOR (June 2011) (Learn how and when to remove this template message)

Sosrobahu is a

This technique is of considerable value in increasing road mileage in large cities where there is limited

Background

By the 1980s, Jakarta was experiencing increased traffic congestion, and flyovers were seen as one solution to the improving transport infrastructure. One construction company operating at that time was PT Hutama Karya, which was granted a contract to build a highway above Jalan A. Yani, an extremely important stretch of highway where it was vital that the road would continue to be open to traffic throughout the period of construction.

In addition to this challenge, PT Hutama Karya were also granted a contract to build a flyover between

shafts) 30 metres (98 ft) apart, on top of which would sit the 22 metres (72 ft) wide road supports. The vertical pier shafts were to be sextagonal in shape with a diameter of 4 metres (13 ft), and were to sit in the central lane of the existing road. The erection of the pier shafts was not difficult; what caused problems were the poured concrete pier heads. With conventional construction techniques, the pier heads would be moved into place with the help of iron supports beneath the outspread pier heads, but the use of iron supports would necessitate the closure of the road below. Another option was to support the pier heads from above, but this increased the costs of the project.

In response to these problems, Tjokorda had the idea of initially erecting the concrete pier shafts and then building the poured concrete pier heads in the centre lane, parallel to the existing roadway, and then raising and turning the pier heads 90 degrees into place. The only problem with this idea was that the pier heads weigh approximately 480 tonnes each.

Inspiration from a hydraulic car-jack

One day Tjokorda was working on his 1974

is banished it is easy to move even the heaviest of objects.

This event inspired the realization that a

hydraulic

pump could be used to lift heavy objects and, as long as they were supported by something slippery, the heavy objects could be easily moved. Tjokorda's goal was to lift and move concrete pier heads each weighing 480 tonnes.

Tjokorda conducted trials with cylinders 20 cm in diameter converted into a hydraulic lift and loaded with 80 tonnes of concrete. The weight was successfully lifted and turned slightly, but could not then be lowered as the position of the hydraulic jack had shifted. Tjokorda then made some improvements on the original design, and in subsequent lifts the hydraulic jack stayed stable even with the full weight of the concrete above it.

Other problems to be overcome included establishing the best type of oil to use that would not lose its viscosity. The type of oil was a critical factor because it was the oil which transmitted the force required to lift the heavy concrete pier heads.

After the trials, Tjokorda finalised his design called the LBPH (the Indonesian acronym for Free Moving Platform) which consisted of two concrete discs with a diameter of 80 cm enclosed in a container. Although only 5 cm thick, the discs are capable of supporting a weight of 625 tonnes each.

Between the two plates is pumped

), although the reasons for this were a mystery to Tjokorda at that time.

Field trials

The new technique had not yet been trialled because of time constraints, however Tjokorda was certain that it would work and was willing to bear the responsibility should the concrete pier heads not be able to be turned 90 degrees as required for the construction of the flyover.

On 27 July 1988 at 22:00 Jakarta time, the hydraulic pump was pressurized to 78 kgf/cm² (7.6 MPa). The pier head, despite lack of iron supports, was lifted and placed on top of the pier shaft and then with a light push was turned 90 degrees into its final position. The oil was then slowly pumped out and the pier head was lowered onto the shaft. The LPBH system was then shut down as it required heavy machinery to move it. Because he was worried that the single pier shaft and head might shift for a lack of support, he propped them up with eight concrete supports, 3.6 m in diameter. The LPBH was then used to raise the other pier heads over their respective shafts.

Naming the technique and the granting of a patent

In November 1989, President Soeharto of Indonesia gave the name Sosrobahu to the new technology. The name was taken from a character in the Ramayana, and derives from Old Javanese for 'thousand shoulders'.

Tjokorda's invention was used by US engineers in the construction of a bridge in Seattle. They placed the oil under a pressure of 78 kg/cm² (7.6 MPa) as per Tjokorda's original theories.^{[clarification needed]} Tjokorda himself wanted to investigate further the limits of his invention and built himself a laboratory where he successfully tested the LPBH to a limit of 78.05 kgf/cm² (7.654 MPa).

invention".

A second version of the technology has been developed. Whereas the first version used a steel anchor inserted in a concrete base, the second version uses a single plate with a hole in the middle which is not only simpler, but also significantly speeds up the time it takes to erect a pylon from 2 days to 45 minutes. It is expected that the lifespan of flyovers constructed using the Sosrobahu method will be approximately 100 years.

According to Dr. Drajat Hoedajanto, an expert from the Bandung Institute of Technology, Sosrobahu is a very simple solution to the problem of erecting flyover pylons and is suitable for use in the construction of elevated toll roads which have traffic running underneath them.

References

Further reading

• "Sosrobahu Bertumpu di Atas Piring", Gatra, 21 August 2004; in Indonesian, requests payment

External links

• About Sosrobahu
• About Tjokorda Raka Sukawati and Sosrobahu; in Indonesian
• Video on Sosrobahu rotation