Liaocheng Xinyuantai Pipe Industry Co., Ltd. provides the construction process description of the ductile iron pipe
1. The pipeline is lifted and ditched: The crane is used to suspend the lower ditch, and the lower pipe is used under the artificial lower pipe method when the crane cannot enter. The lower tube of the machine adopts a soft rope tying tube. The lashing point is about one-fourth of the distance from the tube end. Pay attention to the light suspension and strictly implement the safety regulations for the crane. When the artificial lower pipe is used, two wooden boards are used as the downward support brackets (to prevent the collapse of the pipe ditch) at the edge of the pipe ditch. The wooden board is covered with rubber, and the two soft ropes are used to fix the two points, and the other two points are manually controlled to slowly release the rope.
2. Rubber ring installation: Rubber ring installation is strictly according to the installation process provided by the manufacturer. Before the installation, the socket socket should be cleaned. The socket cleaning brush should be cleaned with a clean rag to clean the interior of the socket, especially the rubber gasket. The location can not be stained with paint, soil, sand and other debris. Clean and lubricate the aprons and sockets, clean the edges of the sockets, place the rubber rings in the sockets to check for complete fit, and then use a special lubricant (supplied by Saint-Gobain piping). In the elbow, adjustable diameter, three-way parts supply as required using the T-stop rubber ring.
3, cast iron pipe installation: cast iron pipe installation, carefully insert the pipe continuously, the depth of insertion can be in the middle of the two white lines. If excessive resistance is found during pipe insertion, stop immediately, pull out the pipe, find out the reason and handle it properly, insert it again, correct the butt joint when docking, and then set a fixed point on the other end of the pipe to use the jack. Use force to insert the pipe. After the pipe is inserted, use a ruler to insert the socket into the edge of the rubber ring, and check whether the insertion is even around the circumference. When installing the pipe, pay attention to the protection of the socket. When the construction is interrupted, seal the nozzle with a protective film to prevent mud and water from entering the tube. After pipeline installation and paving is completed, the joints shall be backfilled immediately; during backfilling, layered tamping shall be performed, fill shall be filled over half of the pipe to prevent the accumulation of stagnant water outside the tank to recharge the trench, causing the pipeline to float, and backfill with soft soil. .
4, pipeline pressure test:
Fire water pipeline: 1.50Mpa, pressure test time is 2 hours.
5, installation requirements of ductile iron pipe:
1) Before the construction, do a visual inspection of the pipe, pipe fittings, rubber ring, etc., and find that any problem can not be used.
2) The installation of the pipeline generally adopts a slide-in "T" type interface, as long as the socket is inserted into the socket to be in place. Construction practice has proved that this interface has a reliable seal, good shock resistance and corrosion resistance; simple operation, easy to master the installation technology; improve working conditions. Is a better interface form.
The installation procedure is: cleaning the socket socket → cleaning the apron → rubber ring → lower tube (pipe) → brush lubricant on the outer surface of the socket and the apron → pushing the tube into the socket → check.
6, installation points:
1. Clean the nozzle: Clean all the debris in the socket.
2. Clean the apron and rubber ring: wipe the adhesive on the apron cleanly, bend the apron into plum blossom shape or 8 shape into the socket groove, and press it along the whole apron by hand. Or use a rubber mallet to make sure that all parts of the apron are not twisted or twisted and evenly stuck in the groove.
3. Brush the lubricant on the outer surface of the socket and the apron: spread the lubricant evenly on the inner surface of the apron installed on the socket, and when the lubricant is applied on the outer surface of the socket, place the socket outside the socket line. Brush all thoroughly.
4. Lower pipe: The pipe should be pushed down to the bottom of the pipe according to the requirements of the pipe. The artificial lower pipe method or the mechanical lower pipe method is usually adopted.
5. Install the equipment: Install the prepared equipment into place. Be careful not to re-contaminate the cleaned pipe parts.
6. Push the tube into the socket: During installation, it is easier and more convenient to insert the socket into the socket. Firstly, insert the socket into the socket and press the socket to the apron in the socket. Connect the wire rope and the reverse chain to tighten the reverse chain. At the same time, one can force the tube to shake right and left at the tube socket end until the socket is inserted. All the sockets are in place, a gap of about 2mm should be left between the socket and the socket, and the distance from the outer edge of the socket to the apron should be the same.
7. Fitting installation: Because the pipe itself has a lighter weight, when using a single wire rope during installation, it is easy to deflect the pipe, causing the rubber ring to be squeezed and cannot be installed in place. Therefore, the double parallel chain can be used to parallel the installation of the pipe, the apron will not be squeezed. Can also be used to lengthen the method of fitting, with a single wire for installation.
8. Check: Check if the location of the socket socket meets the requirements (use steel ruler to extend into the socket gap to check if the apron position is correct).
7, several issues that should be noted
1. The apron should be placed in the socket groove and compacted by hand.
2. When the pipe is to be truncated and then installed, the socket end should be machined into a bevel shape.
3. When using bent corners of the pipe joints for installation in the bend section, install the pipes in a straight line and then turn them to the desired angle. During the installation process, the laid pipe body must be supported on the outside of the arc with a small wooden block to avoid displacement.
4. In the process of installation, the axis line of the fixed pipe and the moving pipe should be on a straight line, otherwise the apron can be easily ejected, which affects the quality and speed of the installation.
5. The pipeline should be installed in a straight line and the pipes should be in a straight line. Be careful when there is a tilt angle.
6. Align the connector of the connecting pipe with the socket. If the insertion resistance is too high, do not insert it by force to prevent the rubber ring from being twisted.
7. When the pipeline installation and laying works are interrupted, use the cover plug to close the nozzle and prevent earth sand and other miscellaneous materials from entering the pipeline.
8. Appropriate casing in the middle of each pipe before pressure testing
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