貝雷架是(shi)形(xing)成一(yi)定(ding)單(dan)元的(de)鋼(gang)(gang)(gang)(gang)(gang)架(jia)(jia)，可以(yi)用它(ta)來(lai)拼接組裝(zhuang)成各(ge)種不同(tong)(tong)的(de)構(gou)件、設備(bei)。貝(bei)(bei)(bei)(bei)雷架(jia)(jia)的(de)長寬尺寸通常(chang)為(wei)3m×1.5m， 貝(bei)(bei)(bei)(bei)雷架(jia)(jia)也被稱(cheng)(cheng)為(wei)“裝(zhuang)配(pei)式(shi)(shi)公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)”，原(yuan)名為(wei)“321”公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)。是(shi)我國(guo)常(chang)用的(de)戰(zhan)(zhan)備(bei)公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)。我國(guo)生產(chan)(chan)的(de)“321”公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)與(yu)英(ying)國(guo)的(de)“貝(bei)(bei)(bei)(bei)雷橋(qiao)(qiao)”相似，主結(jie)構(gou)基(ji)本相同(tong)(tong)，只是(shi)尺寸有差異，貝(bei)(bei)(bei)(bei)雷橋(qiao)(qiao)為(wei)英(ying)制，“321”公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)為(wei)公(gong)(gong)(gong)(gong)制。工程中所采(cai)用裝(zhuang)配(pei)式(shi)(shi)公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)是(shi)由中鐵七(qi)局設計的(de)定(ding)型產(chan)(chan)品，后又被稱(cheng)(cheng)為(wei)裝(zhuang)配(pei)式(shi)(shi)公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)，早期叫做“321”公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)，是(shi)我國(guo)用的(de)較(jiao)多(duo)(duo)的(de)一(yi)種戰(zhan)(zhan)備(bei)式(shi)(shi)公(gong)(gong)(gong)(gong)路(lu)鋼(gang)(gang)(gang)(gang)(gang)橋(qiao)(qiao)。貝(bei)(bei)(bei)(bei)雷架(jia)(jia)是(shi)組成鋼(gang)(gang)(gang)(gang)(gang)便(bian)橋(qiao)(qiao)的(de)一(yi)種基(ji)礎(chu)構(gou)件單(dan)元！其(qi)組合形(xing)式(shi)(shi)多(duo)(duo)樣，可以(yi)用它(ta)來(lai)組裝(zhuang)成很多(duo)(duo)不同(tong)(tong)的(de)構(gou)件和(he)設備(bei)。貝(bei)(bei)(bei)(bei)雷橋(qiao)(qiao)是(shi)到目前為(wei)止，應用較(jiao)為(wei)廣泛，廣為(wei)流行的(de)一(yi)種橋(qiao)(qiao)梁(liang)結(jie)構(gou)，貝(bei)(bei)(bei)(bei)雷架(jia)(jia)具有很多(duo)(duo)優點，產(chan)(chan)品結(jie)構(gou)簡單(dan)，運輸方便(bian)，架(jia)(jia)設快速，分解容易。同(tong)(tong)時貝(bei)(bei)(bei)(bei)雷架(jia)(jia)還(huan)具備(bei)很大的(de)承(cheng)載能力，結(jie)構(gou)剛性好(hao)，耐疲勞等諸(zhu)多(duo)(duo)優點。