They are employed by construction companies, cement and concrete contractors and manufacturers of precast concrete products, or they may be self-employed.
他们受雇于建筑公司，水泥和混凝土承包商和预制混凝土产品的制造商，或者他们可能成为自雇人士。
In the construction sector, companies are using more precast concrete, even for high-rise apartment buildings.
在建筑业，企业正更多地使用预制混凝土，即便是高层住宅楼也是如此。
Precast concrete technology is one kind of industrialized construction methods, and precast concrete structures are one of the most important modern building structures.
预制混凝土技术是工业化的建筑生产方式，预制混凝土结构是现代建筑最重要的结构形式之一。
Making bridge panel concrete with the air cell inner form may quicken the precast bridge panel construction pace, ensure the project quality and drop construction cost.
采用气囊作内模进行浇筑桥面板混凝土，加快了预制桥面板施工进度，确保工程施工质量，并降低了工程施工成本。
In order to solve the torsional problem of precast concrete screw pile in construction, the torsional behaviors of precast concrete pile body were designed strongly and studied by experimental method.
为了解决预制混凝土螺旋桩的抗扭问题，对预制混凝土桩体的抗扭性能进行了加强设计及试验研究。
Its Admixture Systems business unit specifically helps customers in the ready-mix, precast, manufactured concrete and underground construction industries.
旗下的外加剂系统部门在掺水即用型预制混凝土及地下建筑等领域对客户帮助犹大。
The application of steam curing process for precast segmental beams of Humin Elevated Project has increased the early strength of concrete and met the requirements of construction progress.
沪闵高架工程预制节段梁采用蒸汽养护的工艺，使混凝土早期强度增长，满足了施工进度要求。
An experimental investigation was conducted to provide high-performance concrete, with high frost resistance and proper strength, to construction of precast elements of Bridges in Qing-Zang railway.
为配合青藏铁路工程应用，配制抗冻性高、强度较高、适合于青藏铁路预应力混凝土梁的高性能混凝土。
Construction techniques were chosen to be transportable, made of prefabricated elements, mainly from precast concrete, like the pillars and curved concrete shells.
建造时采用可运输的预制元素，主要是预浇铸混凝土，建造支柱和曲形混凝土外壳。
Construction techniques were chosen to be transportable, made of prefabricated elements, mainly from precast concrete, like the pillars and curved concrete shells.
建造时采用可运输的预制元素，主要是预浇铸混凝土，建造支柱和曲形混凝土外壳。
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