How about the manhole thread connection in our country?

(1) the manhole sleeve will be broken pipe, according to the size of the pipe in order to insert the thread, generally 15~32mm sleeve twice, 40~50mm sleeve three times, more than 70mm sleeve 3~4 times is appropriate.1) set wire machine set wire.The pipe is clamped on the chuck of the wire sleeve machine, and the chuck is clamped with the appropriate length, and the number of the plate is aligned with the good die, and the calibration is adjusted according to the diameter of the pipe.Hold the fixing plate tightly, align the lubricant tube with the wire head, start the push plate, and gently loosen the plate until the thread is set to the appropriate length.2) hand set wire plate set wire.To loosen the fixed plate, the set of silk plate plate plate back to 0 °, according to the serial number for die, the plate disc alignment calibration, manhole tighten fixed plate, put pressure in pipe clamp, allow appropriate clamping length, will cover silk board gently set into the pipe material, make its elastic moderate, and then hands push wire board, take 2 ~ 3 button, then stand to the side of moral set of wire plate, the strength should be uniform,When the thread is about to be set, gently loosen the machine, boot back plate, keep the thread should be taper.

(2) Install the manhole According to the sketch of the site survey, the pipe that has been set with good thread shall be fitted with pipe fittings.When installing pipe fittings, the required pipe fittings should be put into the thread, and the tightness should be tested. (Generally, it is advisable to put the pipe fittings into the thread by hand.)Then the thread is coated with lead oil, wrapped hemp (or wrapped with raw material) into the pipe, and then the pipe will be tightened with pipe pliers, so that the thread is exposed 2~3 buckles;Remove the filling material of hemp first class, wipe the lead oil, put the serial number in the appropriate position and wait for straightening.