Water supply pipeline construction is the water supply pipeline line, trench excavation, pipe, interface, soil, pressure test, washing, disinfection, site cleaning, and so on working process.

Determine pipeline routing

In accordance with the design drawings, first, in the construction site determine the location of the buried pipe trench. At the same time, the elevation reference pile is set. The position of the pile should be selected properly so that the elevated pile will not be dug or covered by soil and equipment during the construction.

The excavation groove

To break up the road surface mechanically or manually according to the fixed line. Pavement materials that can be reused should be properly stacked. The grooves should be mechanically excavated to prevent damage to existing underground facilities (such as pipelines). The buried water pipe is usually shallow and does not need to be supported or drained. When buried deep or with poor soil quality, support is required (see drainage pipe construction). At the interface, the slot width and depth are enlarged according to the requirements of interface operation. The water supply pipeline is generally not provided with a foundation, the bottom elevation of the tank is the designed bottom elevation of the pipe. Through bottom soil excavation requirements do not move the original soil, otherwise, fill it with sand.

The pipes

First line up the pipes along the grooves. Make a final inspection before the pipe is slotted, and remove any damage or cracks. The movement and routing of pipes under 200 mm in diameter is usually done without machinery. Large diameter pipes are hoisted by a wheeled crane or tripod and hoist. Piping usually starts at the gate valve or fitting. The pipes are slotted one by one, and the interfaces are made in sequence.

interface

The practice of the interface varies with the pipe. The pipes commonly used in water supply pipelines are cast iron pipes, nodular cast iron pipes, reinforced concrete pipes or steel pipes, and sometimes asbestos cement pipes. Cast iron pipes, nodular cast iron pipes, and reinforced concrete pipes are mostly socket joints, and a few of the cast iron pipes connected with gate valves are flange joints. Steel pipe is generally welded, a few with casing interface. All asbestos cement pipes are connected with casing.

① Socket port. There are two methods, reinforced concrete pipe commonly used rubber rings to fill the interface gap. Cast iron pipes and nodular cast iron pipes are commonly packed for sealing. The earliest use of green lead filler, later with asbestos cement, all need braid embedded solid interface bottom; Recently, rubber filling rings and expanded cement mortar are used for sealing, which is easy to operate, but a qualified rubber filling ring is needed. The green lead interface cost is the most expensive, and the operation is inconvenient; Although the asbestos cement interface is cheap, the labor intensity of layering is very great. The rubber ring interface is elastic, called a flexible interface; The filler interface is inelastic and is called a rigid interface. A rigid interface is easy to damage under force, the flexible interface can adapt to a small amount of displacement, not easy to damage.

② Flange interface. Practice is simple, the flange tube (disk flange) screw hole alignment, insert a rubber ring between the two discs, screw holes interspersed with bolts, screw on and tighten the nut. The flange interface is extremely rigid, the interface is firm, and the positioning requirements of the pipe are strict.

③ Steel pipe interface. Use welding. It is inconvenient to weld in the groove, and it is often moved into the groove after welding the long pipe strip on the ground. Due to the strong stress capacity, the length of the long pipe should be extended as far as possible according to the site construction conditions to reduce the interface in the slot. The groove interface is a commonly used casing interface, generally made of a double flexible or herringbone flexible interface.

Soil cover and pressure test

The interface should be soiled immediately after completion. Leave the interface part when covering the soil. The soil is filled after the pressure test. The earth should be tamped in layers to avoid subsidence of the ground after construction. When the pipeline is laid for about one kilometer, the pressure should be tested. Before the pressure test, the building condition of the supporting piers at the elbow and tee in the pipeline should be checked first, and the pressure test can be carried out only after passing the test. Otherwise, the interface may be loose due to the stress imbalance at the elbow and tee. When the pressure is tested, the water is slowly poured into the pipe and the air in the pipe is discharged. After the air is emptied, the water in the tube is pressurized to the specified value. If it can be maintained for several minutes, the pressure test is successful. After the pressure test, complete the soil cover and clean the site.

Wash and disinfect

Drain water to flush the pipe until the effluent turbidity meets drinking water standards. Disinfection with liquid chlorine or hypochlorite. After the chlorine water in the pipe stays for one day and night, the residual chlorine should be above 20 mg/L. Then rinse with water again, and perform routine bacterial tests on the effluent until qualified.

Cangzhou shenlong pipe manufacturing co., ltd. is a company specializing in the production, processing, and sales of various steel pipes and pipe fittings enterprise, the production base is located in Cangzhou in Hebei. Founded in 1992, covering more than 60,000 square meters, more than 200 employees (including 30 inspectors), and an annual output of around 150,000 tons of steel pipes, and 40,000 tons of pipe fittings.