在线精品视频这里只有精品,熟女人妻在线视频一区二区三区,自拍偷拍欧美激情亚洲,五月婷婷六月久久综合,jizz一区在线观看,亚洲免费视频不卡一区,亚洲成a∨人片在线观看不卡,九色porny人妻91,五月天久久综合色婷婷

鋼筋連接套筒國標(biāo)標(biāo)準(zhǔn)

1、         鋼筋連接套筒原材料應(yīng)該是45號碳結(jié)鋼

2、         鋼筋直螺紋連接套筒外徑長度應(yīng)滿足以下尺寸

規(guī)格                   三級鋼外徑×長度                   四級鋼級鋼外徑×長度

Φ12                           18×28                                   19×32

Φ14                            21×32                                  22.5×36

Φ16                            24×36                                  25.5×40

Φ18                           27×41                                  28.5×46

Φ20                           30×45                                  31.5×50

Φ22                           32.5×49                               34.5×54

Φ25                             37×56                               39.5×62

Φ28                           41.5×62                                 44×68

Φ32                           47.5×70                                50.5×76

Φ36                            53×78                                  56.5×84

Φ40                            59×86                                  62.5×92

Φ50                             74×106                               78×112