Detailed Product Description 1.GB system 2.Light weight Light Weight Girder Box Formwork with Timber Beam, Channel Beam Description: Brief introduction GB system-A is a kind of formwork especially for the bridge floor construction. Competitive advantage ①. Prefabricated connection, convenient and efficient. ②. Light weight but high bearing capacity. ③. Timber is easy resized, so the Tim-formwork is relatively easier to change self’s size and shape. This approved formwork’s economical efficiency.