虾米(mi)腰弯头很常(chang)(chang)用(yong)(yong)，下料制造很简单(dan)，但传统(tong)方(fang)法(fa)对现在(zai)工(gong)(gong)业(ye)的(de)大管径弯头就操作(zuo)困难(nan)，且很难(nan)保证(zheng)精度(du)(du)(du)。现可利用(yong)(yong)计算(suan)机制图放样计算(suan)出(chu)(chu)各点处素线(xian)(xian)(xian)(xian)长(zhang)度(du)(du)(du)，然后(hou)将(jiang)卷管按同样的(de)份数(shu)等(deng)(deng)份，在(zai)素线(xian)(xian)(xian)(xian)上用(yong)(yong)计算(suan)出(chu)(chu)的(de)长(zhang)度(du)(du)(du)截取线(xian)(xian)(xian)(xian)段，连接(jie)端(duan)点即可画出(chu)(chu)切(qie)割线(xian)(xian)(xian)(xian)。壁厚处理方(fang)法(fa)：放样时，先划理论切(qie)割线(xian)(xian)(xian)(xian)，然后(hou)根据(ju)壁厚确(que)定高、低点（开出(chu)(chu)坡口后(hou)）切(qie)割线(xian)(xian)(xian)(xian)的(de)位(wei)置，将(jiang)两(liang)点连线(xian)(xian)(xian)(xian)后(hou)再(zai)计算(suan)各等(deng)(deng)分点素线(xian)(xian)(xian)(xian)的(de)长(zhang)度(du)(du)(du)，在(zai)卷管上划线(xian)(xian)(xian)(xian)切(qie)割，组对后(hou)就可以保证(zheng)所需(xu)的(de)角(jiao)度(du)(du)(du)。国(guo)家标准(zhun)为(wei)S02403钢(gang)(gang)(gang)制管件建筑标准(zhun)。材质一般(ban)为(wei)碳钢(gang)(gang)(gang)、不锈(xiu)钢(gang)(gang)(gang)及(ji)合(he)金(jin)钢(gang)(gang)(gang)。在(zai)日(ri)常(chang)(chang)施(shi)工(gong)(gong)中，虾米(mi)腰弯头比用(yong)(yong)原管及(ji)中板焊制的(de)弯头使用(yong)(yong)要(yao)少得多。