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This paper presents the evaluation of the precast reinforced concrete beam extension, in order to solve the problem of constructing a long and big concrete beam. We discuss the flexural strength analysis for a joint menchanism in the middle of the beam element in order to ease the installation. In this research we conduct expertiment on a total of three test materials. The first test material is a full beam with the size of 3000 mm x 250 mmx 350 mm. The second one is the beam with the cement hollow by the size of 1300 mm x 250 mm x 350 mm. The third one is a beam with the steel sheet extension by the size of 1400 mm x 250 mm x 350 mm. The test result shows that the maximum flexural strength which can be supported by the beam with the concrete hollow tube is lower compared to the whole beam or the beam with a steel sheet extension