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基本建设需要大量的混凝土,混凝土是用砂、石、水泥按一定比例加水搅拌成浆状,再浇注到预先制好的模板里,经养护凝固,达到一定强度之后,再把模板拆下来,就成为混凝土构件或混凝土建筑物了。由于所需要构件形状尺寸不一,所以混凝土施工之前,要根据设计要求,在现场用木板现拼现凑,再用钉子钉好,有时因混凝土对模板压力很大,还要在模板外面加很多木杆支撑。这些做模板的木材用量是非常可观的。在一般工业和民用建筑施工中,模板消耗的木材,约占施工耗用木材总量的60～70％,特别是现浇钢筋混凝土工程的模板,消耗木材情况更为严重。由于混凝土
The capital construction requires a large amount of concrete. The concrete is sanded, stoned, cemented in a certain proportion and mixed with water to form a slurry. Then the concrete is poured into a pre-made template. After solidification and curing, it reaches a certain strength, and then the template is removed. Become a concrete member or a concrete building. Because of the different shapes and sizes of the required components, before the construction of the concrete, according to the design requirements, the wood is spotted together on the spot and then nailed. Sometimes, due to the great pressure of the concrete on the stencil, a lot of outside of the stencil is added. Wooden pole support. The amount of wood used as a template is very substantial. In the construction of general industrial and civil buildings, the consumption of timber from the formwork accounts for about 60 to 70% of the total wood used for construction. This is especially the case for cast-in-place reinforced concrete construction. The situation of consumption of wood is even more serious. Due to concrete