·Pipe laying
■Slotted construction process, according to the construction site environment, deep groove, the water level, soil, construction equipment and seasonal factors such as the comprehensive selection.
■Trench bottom 1 for width, trench depth, underground water level, soil conditions and easy to operate, the provisions of the space of the trench width of the table can be used to refer to the construction unit.
■Underground water level is higher than that of the trench bottom elevation and construction must take effective measures to underground water level dropped to groove bottom below 0.3 to 0.5 M.
■Trench excavation, should strictly control the base height, base and overbreak shall not be disturbed. The base is above 0.2 to 0.3 meters above the level of the original soil to be retained, before laying the tube with a manual to the design elevation.
·Buried depth and foundation
■The pipeline on the roadway under the top of the pipe of minimum thickness of overburden layer is 0.7 meters.
■Piping foundation and material selection should be in accordance with the design requirements. The fourth pages of the provisions of the buried depth and foundation for the design and the relevant units of reference (if no groundwater and basement for the hard formation, the table can be reduced to the number. )
■The design unit shall be separately designed or used to reinforce the structure when the top soil and the maximum covering soil are not satisfied.
■When crossing the railway, road embankment, retaining wall and construction of obstacles, we should set the protective casing made of reinforced concrete, steel, cast iron and other materials, casing diameter should be greater than FRPP compound outside diameter 300mm, the casing should be carried out in accordance with the provisions of the design units and departments.
· Pipe installation
■Before laying pipe, the pipe should be section by section for quality inspection, do not meet the standards shall not be used. Pipe handling in the field is generally available manual handling, but must be gently lifted, no direct drag on the ground.
■The lower pipe can generally be carried out by hand, by the ground personnel will pipe to the bottom of the tank construction personnel. Can also be used for non metal rope slide pipe, so that the pipe is smoothly placed in the groove, the metal wire is strictly prohibited from the pipe end or the pipe from the groove side tumbling thrown into the groove.
■The pipe should be parallel to the flow direction of the socket socket, against the flow direction, from downstream to upstream are installed.
■Interface, the outer wall of the first socket wall and socket clean, coated with a lubricant, then with the bottle gourd to pull at the same time by prying mixed, pipe is installed along the axis aligned gently insert the socket, section by section are orderly arranged. Tube insertion must be in place. DN225 insert 135 + 5mm, DN300 insert 165 + 5mm, DN400 insert 205 + 5mm.
■Rubber rings should be placed at the intersection of second rib between the groove.
■The pipe length adjustment, a cutting section shall be available, but the vertical flat, should not be damaged.
■Rainy season construction, should take measures to prevent floating pipe.
■The connection between the pipe and the inspection well is determined by the design, the practice of the sixth page of this regulation can be used for reference to the relevant units.
·Backfill
■Pipeline installation and acceptance of qualified before the implementation of backfill, trench backfill from tube base part to above the top of pipe within the range of 0.7 meters. You must use artificial backfill, prohibit the use of mechanical push soil backfill, the top tube 0.7 meters above the site, the machine can be adopted from both sides of pipeline backfill and compact and rolling.