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Tahir M. A. ,Tarig El Gamri , ,Isam M. A. ,2009, USE OF PRECAST CONCRETE SLABS AND BRICKS FOR LINING IRRIGATION CANALS,Journal of Science and Technology,10 (2) ,pp:201-215

By Tahir M. A. ,Tarig El Gamri , ,Isam M. A. ,
Seepage, Canal lining, water losses, precasting, concrete canal-lets, jointing system
Canal lining is a method of augmenting water quantity. The paper stressed this aspect by focusing on the use of local materials for concrete lining. Rawakeeb Research Station (RRS) experienced high water losses due to seepage. A concrete canal-let form (consist of two parts) was fabricated of 0.9 mm sheet metal to produce precast concrete canal-lets for lining of RRS canal. During precasting three problems occurred and resulted in failure of the form. A concrete slab form was well designed to avoid problems encountered by the first form. In order to develop jointing system, the precast concrete slabs were provided with acute angle of 45o clockwise along the width of the slab when laid horizontally. The developed jointing system, precasting technique and construction technique provided the required water tightness.
تبطين القنوات هو احد الطرق التي يتم بها زيادة كمية المياه. الورقة أعطت هذا المفهوم أهمية وذلك بالتركيز علي استخدام المواد المحلية للتبطين الخرساني. توجد فواقد مياه عالية بمحطة أبحاث الرواكيب نتيجة لرشح القنوات. صممت فرمة مكونة من جزءين من الصاج مقاس 0.9 مم (المحير) لانتاج وحدات خرسانية جاهزة لتبطين المجري الرئيسي بمحطة أبحاث الرواكيب. أثناء الصب ظهرت ثلاث مشاكل تسببت في فشل استخدام الفرمة. صممت فرمة أخري لانتاج بلاطات خرسانية جاهزة بحيث تتفادى عيوب الفرمة الأولي. لتطوير نظام التوصيل، تنتج البلاطات مع اتجاه عقارب الساعة عندما توضع o الخرسانية مسلوبة من الأمام ومن الخلف بزاوية 45 أفقيا. نظام التوصيل المطور، تقنية الصب وتقنية الانشاء تقلل فواقد المياه للحد المطلوب.
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