英语翻译opposite anchorage,repeating the operation unit the bundle of wires is of the required size.Concrete construction Concrete construction consists of several operations:forming,concrete production,placement,and curing.Forming is required to

英语翻译opposite anchorage,repeating the operation unit the bundle of wires is of the required size.Concrete construction Concrete construction consists of several operations:forming,concrete production,placement,and curing.Forming is required to
英语翻译
opposite anchorage,repeating the operation unit the bundle of wires is of the required size.
Concrete construction
Concrete construction consists of several operations:forming,concrete production,placement,and curing.Forming is required to contain and support itself.The form is made of timber or steel sections or a combination of both and is held together during the concrete placing by external bracing or internal ties.The forms and ties are designed to withstand the temporary fluid pressure of the concrete.
The usual practice for vertical walls is to leave the forms in position for at least a day after the concrete is placed.They are removed when the concrete has solidified or set.Slip-forming is a method where the form is constantly in motion,just ahead of the level of fresh concrete.The form is lifted upward by means of jacks which are mounted on vertical rods embedded in the concrete and are spaced along the perimeter of the structure.Slip forms are used for high structures such as silos,tanks,or chimneys.
Concrete may be obtained from commercial batch plants which deliver it in mix trucks if the job is close to such a plant,or it may be produced at the job site.Concrete production at the job site requires the requires the erection of a mixing plant,and of cement and aggregate receiving and handling plants.Aggregates are sometimes produced at or near the job site.This requires opening a quarry and erecting processing processing equipment such as crushers and screens.
Concrete is placed by means of cranes or cableways,or it can be pumped into place by special concrete pumps.
Curing of exposed surfaces is required to prevent evaporation of mix water or to replace moisture that does evaporate.The proper balance of water and cement is required to develop full design strength.
Concrete paving for airports and highways is a fully mechanized operation.Batches of concrete are placed between the road forms from a mix truck or a movable paver,which is a combination mixer and placer.A series of specialized pieces of equipment,which ride on the forms,follow to spread and vibrate the concrete,smooth its surface,cut contraction joins,and apply a curing compound.
Asphalt paving
This is an amalgam of crushed aggregate and a bituminous binder.It may be placed on the roadbed in separate operations or mixed in a mix plant and spread at one time on the roadbed.Then the pavement is compacted by rollers

英语翻译opposite anchorage,repeating the operation unit the bundle of wires is of the required size.Concrete construction Concrete construction consists of several operations:forming,concrete production,placement,and curing.Forming is required to
相对来说,重复操作单元的电线束,是所需要的大小.混凝土施工由几个操作形成,混凝土生产,安置,和固化.形成需要包含和支持自己.形式是由木材或钢材或两者的结合,是一起举行,在混凝土浇筑的外部支撑或内部关系.形式和关系的设计承受混凝土的临时流动压力.通常的做法是把形成垂直的墙壁位置至少一天,后浇筑混凝土.他们是当混凝土固化或设置.滑移形成的是一种在形式上是不断运动,就在水平的混凝土.形式是向上提升,通过千斤顶是安装在立杆嵌在混凝土和间隔沿周边的结构.滑动形式用于高结构如筒仓,水箱,或烟囱.具体可从商业批植物提供混合车如果工作接近这种植物,或可能产生在工作现场.混凝土生产在工作现场需要需要安装的搅拌设备,与水泥和骨料接收和处理厂.集合体有时产生或附近的工地.这需要打开一个采石场及加工等加工设备破碎机和屏幕.混凝土浇筑采用起重机或索道,也可以是由特殊的混凝土泵泵入.暴露表面的治疗是需要防止混合水的蒸发或取代,蒸发水分.水和水泥的适当平衡是发展所需的全部设计强度.混凝土摊铺机场和高速公路是全机械化操作.批混凝土是放置在道路的形式从一个混合卡车或一个可移动的摊铺机,这是一个组合混合器和砂矿.一系列的专业化的设备,是骑在形式,按照传播和振动的混凝土,它的表面光滑,减少收缩的加入,并用固化性化合物.沥青铺路这是一个汞合金碎石和沥青粘结剂.它可以被放置在路基在单独行动或混合在一个混合植物和传播在一次对路基.然后,路面压实辊.