一yi般ban城cheng市shi井jing蓋gai都dou是shi暴bao露lu在zai外wai麵mian的de，但dan是shi線xian性xing隱yin形xing井jing蓋gai背bei麵mian卻que能neng大da程cheng度du的de隱yin形xing起qi來lai。線xian性xing隱yin形xing井jing蓋gai背bei麵mian一yi般ban會hui在zai排pai汙wu口kou運yun用yong，不bu鏽xiu鋼gang隱yin形xing井jing蓋gai一yi般ban被bei埋mai在zai地di下xia，所suo以yi看kan起qi來lai特te別bie隱yin形xing。另ling外wai在zai裝zhuang置zhi不bu鏽xiu鋼gang隱yin形xing井jing蓋gai時shi，一yi定ding要yao做zuo好hao防fang護hu措cuo施shi。線xian性xing隱yin形xing井jing蓋gai背bei麵mian常chang運yun用yong到dao的de地di方fang便bian是shi排pai汙wu口kou。眾zhong所suo周zhou知zhi，每mei一yi個ge城cheng市shi傍bang邊bian都dou會hui有you地di下xia排pai汙wu管guan道dao的de存cun在zai。而er每mei隔ge一yi段duan距ju離li
，排pai汙wu管guan道dao都dou會hui有you一yi些xie管guan口kou。為wei了le可ke以yi添tian加jia管guan口kou的de安an全quan性xing，管guan口kou必bi需xu求qiu裝zhuang置zhi上shang安an全quan措cuo施shi。而er這zhe個ge安an全quan措cuo施shi就jiu名ming副fu其qi實shi的de交jiao給gei不bu鏽xiu鋼gang井jing蓋gai了le。傳chuan統tong的de井jing蓋gai歸gui於yu鑄zhu鐵tie質zhi料liao，外wai觀guan不bu是shi太tai好hao看kan。所suo以yi，一yi些xie大da型xing城cheng市shi會hui運yun用yong這zhe種zhong不bu鏽xiu鋼gang隱yin形xing井jing蓋gai。線xian性xing隱yin形xing井jing蓋gai背bei麵mian它ta具ju有you了le隱yin形xing的de優you勢shi，又you具ju有you了le防fang盜dao的de特te征zheng。一yi同tong還hai具ju有you了le防fang鏽xiu的de長chang處chu。由you於yu這zhe種zhong井jing蓋gai拆chai開kai非fei常chang的de便bian當dang，所suo以yi非fei常chang有you利li於yu工gong作zuo人ren員yuan的de日ri常chang維wei護hu。除chu了le排pai汙wu口kou要yao運yun用yong到dao這zhe種zhong不bu鏽xiu鋼gang隱yin形xing井jing蓋gai之zhi外wai
，一yi些xie供gong電dian區qu域yu也ye要yao運yun用yong到dao。這zhe裏li線xian性xing隱yin形xing井jing蓋gai背bei麵mian給gei咱zan們men舉ju一yi個ge簡jian略lve的de比bi如ru
，每mei一yi個ge城cheng市shi傍bang邊bian都dou會hui有you地di下xia排pai線xian設she備bei。但dan是shi，這zhe些xie排pai線xian設she備bei又you需xu求qiu一yi個ge安an全quan的de環huan境jing。所suo以yi，地di下xia排pai線xian設she備bei就jiu會hui有you一yi些xie管guan道dao。但dan是shi，排pai線xian設she備bei也ye有you出chu現xian缺que點dian的de時shi分fen，所suo以yi要yao有you一yi個ge出chu口kou便bian當dang對dui地di下xia排pai線xian設she備bei進jin行xing維wei護hu。此ci刻ke

，就jiu要yao運yun用yong到dao不bu鏽xiu鋼gang井jing蓋gai了le。由you於yu地di下xia排pai線xian設she備bei比bi較jiao多duo，所suo以yi隱yin形xing井jing蓋gai既ji非fei常chang好hao的de起qi到dao了le美mei化hua的de作zuo用yong

，一yi同tong又you非fei常chang便bian當dang工gong作zuo人ren員yuan進jin行xing翻fan開kai維wei護hu。