(一) 在旧的水泥混凝土路面上重型车辆的行驶;加铺水泥混凝土面层的结构形式有三种:结合式、部分结合式和分离式。所谓结合式指新旧两层紧密连结成一整体;部分结合式指新旧两片之间的连结程度差,不能完全形成一个整体;分离式是两层之间设置隔 (1) The driving of heavy vehicles on the old cement concrete pavement; There are three kinds of structure forms of the concrete pavement: combined type, partially combined type and separated type. The so-called combination refers to the old and new two closely linked into a whole; part of the combination of old and new means that the degree of the connection between the two pieces is poor, can not completely form a whole; separation is set up between the two layers