cross main meaning in English

交叉总管

According to the types , height and fireproof grade of the buildings , four basic ringed arrangements are brought up , namely the ringed arrangemensts of branch lines , the ringed arrangements of cross mains , the ringed arrangements of feed mains and the ringed arrangements of fire waterhead . on the basis of analyzing the means , characteristic and applicability of the four basic ringed arrangements , several practicality ringed arrangements are brought up , namely the ringed arrangements of branch lines and cross mains , the ringed arrangements of cross mains and feed mains , the ringed arrangements of branch lines and feed mains , the vertical ringed arrangements of feed mains and the ringed arrangements of sprinkler system in the abnormity buildings
根据建筑物的类型、高度和防火等级等因素，提出配水支管环状、配水干管环状、立管环状和消防水源环状这四种基本环状形式，分析了四种环状管网的环状布置方法、特点和适用性。在此基础上又提出了支管与干管环状、干管与立管环状、支管与立管环状、立管竖向环状以及不规则区域环状等几种实用的环状形式。