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How to install ductile iron pipe to reach the national standard?

Ductile iron pipe as the decision to the safe operation of the network the first element, the first should have the basic characteristics of continuous operation for a long time, and the appropriate pressure and quality of service will give the ball the ink tube system installation requests, what should be achieved from the installation Objectives and can out-reach installation requirements? This topic may be engaged in the business for many years ductile pipes may not be able to tell a professional engineer or two of the questions, this article specifically on the installation of ductile pipe interviewed experts.
How to install ductile iron pipe to reach the national standard?
 
 
Ductile iron pipe as the decision to the safe operation of the network the first element, the first should have the basic characteristics of continuous operation for a long time, and the appropriate pressure and quality of service will give the ball the ink tube system installation requests, what should be achieved from the installation objectives and can out-reach installation requirements? This topic may be engaged in the business for many years ductile pipes may not be able to tell a professional engineer or two of the questions, this article specifically on the installation of ductile pipe interviewed experts.

First select the supplier of good quality:
In the urban water supply projects, water supply pipeline in the entire water supply project cost of the investment is relatively large, about the total cost of the entire water supply project for 50 to 70%. Therefore, choosing the right pipes and good construction quality, is to ensure the safe operation of urban water supply networks basic guarantee.
Second, the installation of buried depth of compliance:
Trench bottom width generally designed tube diameter 0.5 meters, and according to soil conditions, determine the excavation slope (i), drawing cutaway view of the groove. Pipeline burial depth should be based on the frozen degree of external load and other factors determine the cross pipe. Under normal circumstances, depth can be frozen at 0.2 meters below, and meet the following conditions: when the diameter is greater than 100mm, the tube top of the minimum depth of 1.20 meters.
Third, the construction of pre-prepared to fully
1, prior to the construction of pipe, pipe, rubber ring, and so do a visual inspection and found that the problem can not be used.

2 Slide-pipe installation generally use "T"-type interface, as long as you can jack into the socket in place. Construction proved that this interface has a reliable seal, good shock resistance and corrosion resistance; simple to install technology easy to master; to improve working conditions. Is a better interface to form.

Setup is: clean clean apron socket jack → → → on the apron under the tube (discharge tube) → in jack on the brush surface and the rubber ring push tube lubricant → make → check into the socket.

3, the installation points:

①, cleaning nozzle: the Order of the mouth cleaned of all debris removal.

②, cleaning apron, the apron: The apron adhesive material on the wiping clean the rubber ring bending as "plum-shaped" or "8" shaped groove into the socket and press it again by hand along the entire apron , or real hit with a rubber hammer to ensure that all parts of apron not Alice is not twisted, evenly card slot.

③, the outer surface of the socket and the apron brushing lubricant: lubricant evenly brushing the sockets installed in the inner surface of apron, brushing the outer surface of lubricant in the socket when the outside line jack to jack site All brush evenly.

④, down tube: the request should be under the control down to the bottom of the tube, usually under artificial or mechanical tube under the tube.

⑤, installation of machinery or equipment: machinery and equipment installation will be prepared in place, the installation has been careful not to clean up pollution in the tube parts again.

⑥, push the tube to make it into the socket: during installation, in order to jack into the socket in more effort, smooth. First of all within the jack and jack into the socket down to the apron on the socket, connect the wire rope and down chains, tighten down chain; At the same time, people can be forced in the pipe socket end of the tube from side to side until the jack into the All sockets in place, with socket and the socket should be left between the gap of about 2mm, and to ensure that the outer edge of socket four weeks the same distance to the apron.

⑦, pipe installation: Because its lightweight tube, used in the installation of a single wire, it is easy to deflect the tube, causing the rubber ring being squeezed, can not be installed in place. Therefore, force can be parallel double inverted chain approach to make a parallel installation of pipe, rubber ring will not be pushed. Extension tube can be applied approach, with a single wire for installation.

⑧, check: Check the location of jack sockets for compliance (socket with a steel ruler inserted into the gap in the correct position checked apron in place.)

Fourth, quality assurance inspection to be reliable:
1, the apron is for the mouth to put a tank, and hand compaction.

2, when the pipe to be truncated after the installation, the jack-side groove to be processed into shape.

3, in the curved section of the interface using pipe installed by the corner, pipe a straight line should be installed first, and then go to the required angle. During the installation process to be outside of the arc has been paved with small pieces of wood to the governing body stays steady, so as to avoid displacement.

4, the installation process, setting pipe, tube axis line is to be moving in a straight line, otherwise it will be top of the apron, the quality and speed of installation.

5, the pipeline installation to be flat, the tube should be a straight line between the case of tilt angle, be careful.

6, the connecting pipe aligned socket interface, if the insertion force is too large, do not force it, to prevent distortion of the rubber ring.

7, pipeline installation and laying interrupt, the application of the cap plugging the nozzle closed, to prevent sediment and other debris into the pipe.

8, before pressure test tube in the middle of each appropriate casing.

Ductile iron pipe is a combination of magnesium or magnesium ball agent in the molten iron was added before pouring in the graphite nodularity, reduced stress concentration, so that pipe has a strength, elongation, impact resistance, corrosion resistance and good sealing benefits; wall with cement mortar lining, improving the water environment, the pipeline to improve water supply capacity and reduce energy consumption; nozzle with flexible interfaces, and the pipe itself has a large elongation (> 10%), so that the flexible pipe better, in the buried pipeline to the surrounding soil and pipeline work together to improve the pipeline by the force of the state, thus increasing the network reliability. Therefore, it is usually the water supply industry in China as the head of ductile iron pipe material.

If the letter of the installation according to methods described in the text \ technical points to construction, and can not meet the national standard that does not requirements of the project.

Updatetime:2011-04-05 14:00:20  Views:0
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