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预制方涵的工艺方法：
Precast square culvert process method:
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用靠模制作钢筋骨架；钢筋骨架及予埋件安装入模，在钢筋骨架上装塑料专用保护垫块后，钢筋骨架入模前，外模先就位，同时端模就位一侧，内模缩紧，钢筋骨架入模，另一侧端模就位，同时内模张开就位，整体加固；
The reinforcement framework is made with a template; after the reinforcement framework and embedded parts are installed into the mold, the plastic special protection cushion block is installed on the reinforcement framework, the external formwork is in place before the reinforcement framework is put into the mold, and the end formwork is in place on one side, the internal formwork is tightened, the reinforcement framework is put into the mold, and the end formwork on the other side is in place, and the internal mold is opened in place for overall reinforcement;
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浇筑运至构件模具相应位置进行钢筋笼安装，同时完成各种预埋件的安装，浇筑混凝土，采用附着振捣器与振捣棒结合振捣方式，振动至混凝土与侧板接触所处没有有喷射状气泡、水泡，表面浮浆不再下沉为止；使用木抹进行收水，使构件面平整；使用钢抹精工抹平静养；采用棚式无压蒸养方式，控制蒸汽养护升温、 降温的时间及幅度；混凝土经收水、压光、静养，进行无压蒸养；当构件强度达到时，先拆除内模、再拆除外模、同时收紧内模，通过升起底部模板使构件顶部与内模脱离，方涵构件制成，底模与构件平移出模具；；对方涵构件局部缺陷进行修补，修补后对方涵构件进行水养， 水养的方式可采取喷淋、水泡两种方式进行
The concrete shall be poured and transported to the corresponding position of the component mould for the installation of reinforcement cage, and various embedded parts shall be installed at the same time. The concrete shall be poured by using the vibration method of attached vibrator and vibrator, until there is no jet bubble or bubble at the contact between the concrete and the side plate, and the surface laitance will not sink any more; the wood trowel shall be used for water collection to make the component surface smooth; the steel trowel shall be used for finishing It adopts the shed type non pressure steam curing mode to control the temperature rise of steam curing The time and range of cooling; the concrete is subject to no pressure steam curing after water collection, calendering and static curing; when the strength of the component reaches, the internal formwork shall be removed first, and then the external formwork shall be removed, and the internal formwork shall be tightened at the same time. By lifting the bottom formwork, the top of the component shall be separated from the internal formwork, and the bottom formwork and the component shall be moved out of the mold; the local defects of the square culvert component shall be repaired, and the square culvert structure shall be repaired Water culture can be carried out in two ways: spray and bubble