【 Weak current College 】 weak pipeline man (manual) settings for well holes

A weak pipeline, in the following location should be set (hand) hole:
1, the bifurcation pipe;
2, intersection;
3, straight segments every 80 ~ 100 meters, the maximum may not exceed 150 m;
4, road gradient larger juncture;
Second, the pipeline crossing bridges, railway, Canal, etc., should be set on both sides in the (hand) hole.

Third, the trunk pipe bending bending radius not less than 36 metres. The same period, should not have an S-bend or u-bend.

Four people (hand) hole specifications, should press the forward pipe hole a few determines:
1, pipe hole is not greater than 3 holes in the pipe and place floor type transfer box, hand hole.
2, pipe hole 4 ~ 8 hole with a small aperture.
3, pipe hole 9 ~ 23 holes with a manhole in the numbers.
4, pipe hole is 24 ~ 42 holes in large manhole.
5, more than 43 hole, can be designed.

Five, the shape of a manhole should be divided, pipe interaction deflection angle determines:
1, in a straight line or two sections of pipe deflection angle smaller than when you use pass-through type 22.5o manhole.
2, two-stage pipeline misalignment between the 22.5o ~ 67.5o, slant pass-one hole.
3, two broken pipe deflection angle at 90o 67.5o ~, or pipeline between the T-shaped differences, using three-man hole.
4, the pipeline for cross differences, using four-way type man hole