3.1 Construction conditions 3.1.1 General provisions
a. Design drawings and other technical documents are complete and have been jointly reviewed;
b. Technical briefings have been made according to the approved construction plan or construction organization design;
c. Materials, construction force, machinery, etc. can ensure normal construction;
d. The construction site and temporary facilities such as construction electricity, water, and material storage sites can meet construction needs;
e. The construction personnel have received installation technical training.
3.1.2 Before installing pipelines, you should understand the structure of the building and be familiar with the design drawings, construction plans and cooperation with other types of work.
3.1.3 Installers must be familiar with the general characteristics of cnd machining ABS plastic steel pipes and master the basic installation operation points. Blind construction is strictly prohibited
3.2Handling and storage
3.2.1 ABS plastic steel pipes and fittings are relatively light and easy to handle. Rough handling and dragging along the ground should be avoided to avoid damaging the outer surface of the pipe. When transporting small-diameter pipes, two people should carry them to avoid bending and tensioning the center of the pipe and damaging the pipe when one person is carrying it in the middle. When mechanically lifting pipes, the metal slings must not directly contact the pipe surface. Use softer materials and pads as much as possible. It should not be hung in the middle of pipes.
3.2.2 When storing ABS plastic steel pipes, they should be covered with covers to avoid direct sunlight, because excessive ultraviolet intensity will cause changes in the surface of the pipe. Pipes should be stored in a horizontal place, with a maximum stacking height of no more than 1.5 meters. Wooden slats or soft materials should be placed where the lowest layer meets the ground. When there is a large temperature difference between the construction site and the material storage place, the pipes and fittings should be moved to a cool place at the construction site (avoiding direct sunlight) and left for a period of time (more than 24 hours) before installation so that the temperature is close to the on-site construction temperature.
3.3 Laying through walls, floors and concealed pipe racks 3.3.1 When installing ABS machining through walls, floors and embedded wall concealed pipes, slots, embedded casings or pipe fittings should be reserved in conjunction with civil engineering. If there are no special regulations on its size, the following regulations should be followed:
A. The size of the reserved hole should be 50 ~ 100mm larger than the outer diameter of the pipe;
B. The size of the embedded casing should be two sizes larger than the nominal outer diameter of the passing pipe;
C. The clearance between the overhead pipe and the top shall not be less than 100mm. 3.3.2 When pipelines pass through basements or exterior walls of underground buildings, strict waterproofing measures should be taken.
3.3.3 The connection between ABS plastic steel pipes and metal pipe fittings, valves, etc. should be threaded or flanged.
3.3.4 The cold-soluble joints of pipelines should be firm and the connections should be tight and without gaps;
3.3.5 The horizontal pipes of the pipeline system should have a slope drainage device with a slope of 2% to 5%.
3.3.7 The piping and pipe connections of the piping system should be carried out according to the following steps:
A. Set out the lines according to the coordinates and elevations of the design drawings, and draw actual measured construction drawings;
B. Conduct piping according to the actual construction drawings and perform pre-assembly;
C. Pipeline connection;
D. Joint protection. For pipes connected by cold melt, loading of the initially bonded joints should be avoided. After insertion, they need to be held tightly by hand for a period of time, about 10-60 seconds, depending on the diameter of the pipe. Wait until It can be moved after initial solidification.
3.4 Laying of indoor pipelines
3.4.1 Indoor exposed pipes should be installed after the civil construction is completed. Before installation, you should first check whether the position of the reserved holes is correct.
3.4.2 Before installing the pipeline, pipe clamps should be set up as required, and the position should be accurate and firm. The pipe clamp should be in close contact with the pipe, but the pipe surface should not be damaged.
3.4.3 If metal pipe clamps are used to fix the pipeline, plastic tape or rubber spacers should be used between the metal pipe clamps and the plastic steel pipes. Hard spacers are not allowed.
3.4.4 At the connection point between metal pipe fittings and plastic steel pipes, the pipe clamp should be set at one end of the metal pipe fittings and as close as possible to the metal pipe fittings.
3.4.5 Axial distortion is strictly prohibited when laying pipes, and forced correction is not allowed when passing through wall panels or floor slabs.
3.4.6 For indoor concealed pipes, wall grooves must be filled with 1:2 cement mortar.
3.4.7 Reliable fixing measures must be taken at each water distribution point and stress point of the plastic steel pipe.
3.4.8 The distance between supports (hangers) for plastic steel pipes shall not be greater than the distance specified in the table 2.5.3 “Maximum Support Spacing for ABS Plastic Pipes”.
3.4.9 When plastic pipes pass through floor slabs or wall panels, casings must be installed. The casings can be plastic pipes or metal pipes; when passing through roofs, metal casings must be used. The casings should be no less than 100mm above the ground roof, and Take strict waterproofing measures. 3.4.10 When passing through two floors or wall panels, the casing should be on the same axis and must not be misaligned or skewed.
3.4.11 When installing expansion joints, a gap of 5mm to 10mm needs to be left between the two pipe heads to serve as space for the straight pipe to expand. The rubber like used for the joint must be kept flat and must not have any bending when placed into the pipe and straight pipe. Brackets should be provided at the expansion joints to fix them
3.5 Laying of buried pipelines 3.5.1 The laying of plastic steel pipelines with an indoor floor thickness below ±0.00 should be divided into two sections. First, lay the floor below ±0.00 to the outer wall section of the foundation wall; after the civil construction is completed, lay the outdoor connecting pipes.
3.5.2 The laying of pipelines below the floor should be carried out after the backfill soil of the civil engineering project has been compacted and then excavated again. It is strictly prohibited to lay before backfilling or in uncompacted soil.
3.5.3 The bottom of the trench for laying pipes should be flat and there should be no protruding hard objects. The particle size of the soil should not be greater than 12mm, and a 100mm thick sand cushion can be laid if necessary.
3.5.4 When backfilling buried pipelines, the backfill soil around the pipe must not be mixed with sharp hard objects and directly contact the plastic steel pipe wall. The pipe should be backfilled to 300mm above the top of the pipe with sand or soil with a particle size of no more than 12mm, and then the original soil can be backfilled after compaction. The burial depth of indoor buried pipelines should not be less than 300mm, and the burial depth of outdoor pipelines should be below frozen soil.
3.5.5 A protective pipe should be installed where the plastic steel pipe exits the floor, and its height should be 100mm higher than the floor. When plastic pipes pass through foundation walls, metal sleeves should be installed.
3.5.6 When plastic steel pipes cross neighborhood roads, the thickness of the covering soil shall not be less than 700mm. When crossing a highway, the thickness of the covering soil shall not be less than 1000mm. Otherwise, strict protective measures should be taken
3.6 Connection method The ABS pipe connection method can be cold melt connection, wire connection, flange connection. For specific installation methods, see Appendix A.
3.7 Safety production 3.7.1 The caps of cold sol and surface treatment agents should be opened immediately after use. They should be tightly closed and sealed immediately when not in use. Use by non-operators is strictly prohibited.
3.7.2 Where pipes are connected to the operating area, open flames and smoking are prohibited, and ventilation must be good. Exhaust facilities should be installed in centralized operating areas.
3.7.3 When connecting pipes with cold sol, operators should stand upwind and wear protective gloves, glasses, masks, etc. to avoid direct contact between skin and eyes and cold sol.
3.7.4 During winter construction, anti-cold and anti-freeze measures should be taken. The operating place should maintain indoor air circulation and should not be sealed.
3.7.5 It is strictly prohibited to climb on ABS pipelines, tie safety ropes, set up scaffolding boards, use them as supports or borrow them for other purposes. It is strictly prohibited to impact or drive sharp objects such as metal nails on the pipelines.