农村建造混凝土结构的沼气池,因受条件限制,用钢制或木制模具施工的较少,多数用砖模施工。但砖模施工有一些缺点:一是砖块吸水能力强,容易吸收混凝土中的水分和水泥浆;二是容易形成隙洞,振捣中发生漏浆现象(水泥浆);三是砌筑砖模的胶泥(粘土膏)易被挤入混凝土中。因此,砖模浇筑混凝土往往出现“三多一脱”现象 Construction of rural digesters of concrete structures, due to conditions, less steel or wooden mold construction, the majority of brick mold construction. However, brick and mortar construction has some disadvantages: First, strong water absorption capacity of bricks, easy to absorb water and grout in concrete; the second is easy to form voids, vibrating leakage phenomenon (grout); Third, brick masonry Mold clay (clay paste) is easily squeezed into the concrete. Therefore, the brick mold pouring concrete often appear “more than one off three” phenomenon