How to lay out the concrete pump pipe
Principle of making layout plan:(1) Shorter pipeline and less elbows as far as possible.
(2) Convenient material feeding and concrete conveying.
(3) Close distance from power supply and water resource. Convenient drainage.
(4) Safe working environment.
(5) Convenient maintenance of wet spraying machine and conveying pipe.
(6) Convenient pipe support, fixing, cleaning and dismantling. Convenient layout for construction.
Connection method of concrete pumpand conveying pipe
Concrete pump outlet and conveying pipe can connect as the following three methods.
(1) Direct connection: Concrete pumpoutlet directly connects with taper pipe of inner diameter 100 -80 mm. Taper pipe and concrete pump lay in a straight line.
(2) U connection: 180° connection. Pump outlet connects with taper pipe of inner diameter 100~80mm by two bent pipes of inner diameter 100 mm x 90°mm, or by a U connection of inner diameter 100 mm.
(3) L connection: Pump outlet connects with taper pipe of inner diameter 100~80mm by a bent pipe of inner diameter 100 mm x 90°mm. Taper pipe and concrete pumplay vertically.
If the conveying pipe of inner diameter 100mm is adopted, the taper pipe of inner diameter 100~80mm can be omitted in the above methods.
As for direct connection, pumping resistance is weaker, but the concrete pump suffers more reactive force. For U connection, pumping resistance is stronger, but the concrete pump suffers less reactive force. For L connection, both resistance and reactive force is between the former two connection methods, but the concrete pump will generate transverse vibration.
Concrete pump outlet and conveying pipe can connect as the following three methods.
(1) Direct connection: Concrete pumpoutlet directly connects with taper pipe of inner diameter 100 -80 mm. Taper pipe and concrete pump lay in a straight line.
(2) U connection: 180° connection. Pump outlet connects with taper pipe of inner diameter 100~80mm by two bent pipes of inner diameter 100 mm x 90°mm, or by a U connection of inner diameter 100 mm.
(3) L connection: Pump outlet connects with taper pipe of inner diameter 100~80mm by a bent pipe of inner diameter 100 mm x 90°mm. Taper pipe and concrete pumplay vertically.
If the conveying pipe of inner diameter 100mm is adopted, the taper pipe of inner diameter 100~80mm can be omitted in the above methods.
As for direct connection, pumping resistance is weaker, but the concrete pump suffers more reactive force. For U connection, pumping resistance is stronger, but the concrete pump suffers less reactive force. For L connection, both resistance and reactive force is between the former two connection methods, but the concrete pump will generate transverse vibration.
Conveying pipe layout
Pump concrete upward: when pump concrete upward, vertical pipe is better than tilt pipe in elevated section, which can reduce pipeline length and pumping resistance. But due to some restrained terms, tilt pipe is the only choice.
Pipe layout in upward pumping should meet the following requirements.
(1)When the vertical pumping height is more than 10 m, the horizontal pipe converted length should be longer than two-thirds of the elevated height.
(2)When the pumping height is more than 20 m, stop valve should be installed between the lower part of elevated section and horizontal section to prevent concrete back flow.
(3)When vertical pipe is adopted in elevated section, an elbow pipe with supporting seat should be installed at the bottom of elevated pipe.
(4)At the vertical pipe end of elevated section, horizontal pipe is usually be connected, and the vertical pipe should be fixed with the surrounding buildings.
Pump concrete downward: In downward pumping, concrete may decline due to the self weight according to different tilt conditions. Thus, the concrete may segregate and form cavity in the upper tilt pipe, which will cause blockage. The pipe should be connected according to the concrete gravity flow.
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