What tools and methods are needed for the installation of plastic hoses and steel tubes?
Because of the linear expansion of PVC - U drainage pipe, the temperature expansion is larger. In the installation of drainage risers. To install expansion joints, but how to install, and what part of the installation, the construction unit is notVery clear. At the same time in the construction of cross branch often is not properly installed or not installed bellows expansion joint, and in accordance with the specifications, drainage cross branch, stem straight pipe, ventilation pipe, circular ventilation tube apparatus and ventilation pipe on the confluence confluence no greater than 2 m, should be set expansion joints, and horizontal drainage the branch should set up special expansion joint. And the maximum spacing of retractable joints shall not exceed 4 M.
In some high-rise buildings, designers often need to enlarge the diameter of the pipe when they are designed, and the construction is usually done at the bottom of the riser with two pipes with the same pipe diameter as 45. Elbow connection, and then in the discharge pipe for variable diameter, often easy to change in the connection at the formation of gas plug, resulting in pipe blockage, affecting the drainage of the pipe. The correct method is to use the reducer at the bottom of the riser to enlarge and connect the elbow, and the eccentric reducer is used for the eccentric diameter, and the eccentric side is on the inner circle side of the turn.
Is three (four pass) into the vertical connection pipe and the horizontal branch, cause the connection to form water jet flow, pipe flow is not smooth, the drainage system pressure fluctuations, sanitary ware water drainage pipe can be destroyed, poisonous and harmful gas in the indoor environment pollution caused by the invasion. The correct approach is to install 45 here. Three or three times through cable.
(1) quantity. When the storey height is less than 4 m, the riser shall be provided with a telescopic joint on each floor; when the storey height is greater than 4 m, the design shall be determined according to the design expansion amount, and the maximum allowable amount of expansion shall not be greater than the expansion joint(2) site. The construction units often think that as long as the drainage pipe is provided with a telescopic section can satisfy the requirement, even as the expansion joint connecting pipe joints, Water Leakage caused by seepage, the correct approach is socket expansion joint should be set along the direction of flow, when the drainage pipes in the floor below access riser expansion joints should be set under water confluence pipe; when the drainage pipes in the floor above the access riser section should be arranged on the telescopic water confluence pipe; drainage pipes in the floor and upper and lower access, should be located in the middle section of the telescopic floor. At the same time, when the riser passes through the floor as a fixed support, the expansion joint can not be fixed, and when the contraction section is a fixed support, the riser can not be fixed through the floor. A telescopic joint arranged on the transverse pipe shall be arranged at the end of the water current converging pipe fitting.
