99热这里只有精品9,久久精品成人一区二区三区,《h色视频在线观看》免费日韩在线观看,色老头xxxx性开放

鋼筋連接套筒國(guó)標(biāo)標(biāo)準(zhǔn)

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

2、         鋼筋直螺紋連接套筒外徑長(zhǎng)度應(yīng)滿足以下尺寸

規(guī)格                   三級(jí)鋼外徑×長(zhǎng)度                   四級(jí)鋼級(jí)鋼外徑×長(zhǎng)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