UNIRAP SYSTEM H I G H - H E A D M A T E R I A L D E L I V E R Y F O R S H O T C R E G R I D B E A M C O N S T R U C T I O N Using newly developed mix propotion with special admixtures, grid beams with a designs strength of 24MPa are constructed. Delivery System 1 2 3 4 Since 1960 , s shotcrete-based grid beam structures have been increasingly installed as one of the major slope stabilization methods in Japan. As the number of projects increased, demands to install beams of higher strength at higher places prompted improvement of conventional spray gun based installation system. UNILAP system was developed by Raito Kogyo to respond to the demands by combining pumping delivery with shotcrete operation. I n c o n t r a s t t o t h e c o n v e n t i o n a l s h o t c r e t i n g w h i c h u s e s a i r t o d e l i v e r m a t e r i a l s f r o m t h e p l a n t , U N I R A P u s e s a h i g h - h e a d p u m p t o d e l i v e r t o a s h o t c r e t e p o i n t . P r e s s u r i z e d a i r i s a d d e d a t t h e Y - b r a n c h n e a r t h e n o z z l e . T h e n t h e m a t e r i a l s a r e b l a s t e d i n t o t h e f o r m s a s i n n o r m a l s h o t c r e t e o p e r a t i o n . T h e a i r p r e s s u r e i s p r o p e r l y c o n t r o l l e d w i t h r e g a r d t o f l u i d d y n a m i c s t o p r e v e n t t u r b u l e n c e a n d d i s p e r s i o n o f t h e m a t e r i a l . H i g h s t r e n g t h m o r t a r / c o n c r e t e This system minimizes the rebound which causes material loss and product deficiency. H i g h q u a l i t y m o r t a r / c o n c r e t e Using high-head pump and special materials, this system can deliver wet mix to 135m vertically or to 660m horizontally. D e l i v e r m a t e r i a l s t o 1 3 5 m i n h e i g h t o r 6 6 0 m i n d i s t a n c e Special formwork units help to construct the product being firmly attached to the slope surface. U n i q u e f o r m w o r k m a d e o f w i r e m e s h 5 The material preparation process, including scaling, mixing and pumping, is fully automated to achieve high product quality. A u t o m a t e d p l a n t f o r r e l i a b l e q u a l i t y c o n t r o l UNIRAP Method