八字墙作为桥涵洞口的形式在我国铁路、公路建设中被广泛采用,一般设计要求浆砌或C15混凝土现浇。浆砌墙背混凝土块外镶面的作法具有建筑美感较强,工艺操作简便,四面墙可同时开工,取材广泛,材料价格低廉,所需设备、工艺简单等优点。一、混凝土块外镶面的设计1.根据八字墙的初步 Eight-character wall as a bridge culvert in the form of China’s railway and highway construction is widely used, the general design requirements of masonry or C15 concrete cast-in-place. The practice of masonry back concrete block veneer has the advantages of strong architectural aesthetics, simple process operation, simultaneous start of four walls, wide range of materials, low material cost, simple equipment and simple process. First, the design of concrete blocks outside the wall 1. According to the initial character wall