Key points of water supply and drainage engineering construction?

In view of the common quality problems in drainage engineering construction, the supervision engineer supervises the construction contractor to strictly abide by the construction process operation procedures and eliminate common problems.

1, pipeline construction operation conditions and control points

(1) construction control points of buried pipeline

Buried pipelines must be laid on the undisturbed solid soil layer or on the loose soil layer that must be compacted according to the design requirements. Pipes and pipe supports or piers shall not be laid on frozen soil and untreated disturbed loose soil. When there are stones in the tank, the disturbed soil layer should be treated clearly to prevent the uneven settlement of the pipeline from causing quality accidents. The elevation and coordinates of pipeline laying shall meet the design requirements. Rigid PVC plastic pipes are only suitable for pipeline installation in buildings.

During outdoor pipeline construction in rainy season, drainage measures should be taken to prevent blisters, and more importantly, to prevent surface rainwater from flowing into the trench and causing pipeline drift and cracking.

The trench of buried pipeline should be straight, the trench bottom should be compacted and leveled, and the slope meets the requirements. Pipe holes should be reserved in advance when crossing the building foundation.

(2) When installing pipelines (including pipelines in equipment layer, pipeline well and ceiling), the elevation and coordinates of various pipelines should be checked first, and all pipelines should be arranged neatly and meet the requirements of design drawings.

(3) The installation distance of indoor exposed piping is 1-2 floors from the progress of civil engineering structure, and the indoor level is flat.

The elevation and room dimension line should be well played, and the installation should be carried out when the rough decoration process has been completed and there are no other obstacles.

(4) When installing sanitary ware, the water pressure test and water closing test should be completed in the pipeline connected with sanitary ware, and the concealed pre-inspection procedures have been completed;

The stable installation of bathtub should be carried out after the waterproof layer and protective layer on the ground of bathroom and bathroom have passed the civil engineering professional inspection.

2, the main drainage installation

(1) The buried pipeline foundation meets the design and pipeline operation conditions, and the installation can only be carried out after the pipeline slope elevation, coordinates and reinspection are up to standard; The sockets face the incoming water direction and are arranged in sequence from the source of the water outlet to the room. The winding materials and interface methods are strictly in accordance with the design requirements and installation process, and measures are taken to prevent the pipeline from shifting during winding. Measures should be taken in winter to apply antifreeze in winter.

(2) After the installation of buried pipelines is completed and the closed water test meets the requirements, the acceptance procedures of pipeline concealed works can be carried out. After the reserved nozzle can be temporarily blocked, the pipeline backfill can be carried out according to the specified requirements.

2, drainage riser pipe bracket, hanging pipe installation

(1) The drainage pipes installed in the equipment floor or ceiling can be supported, hoisted or built into piers according to the design requirements. After the pipeline installation is completed, do a good job of water closing test, and do a good job of concealed inspection according to concealed engineering projects. Only after the pipeline anticorrosion and thermal insulation process has passed the construction acceptance can the civil structure cover ditch cover plate, sealing equipment cover plate and ceiling be decorated.

(2) Installation of drainage riser

When installing the riser, pay attention to the position and elevation of the reserved branch pipe and inspection hole, and meet the design requirements; The supervision of elevation buildings should consider the installation of pipeline expansion compensator.

4. The pipe material of internal drainage rainwater pipeline should be selected according to the design requirements, and pay attention to the requirements of pipeline pressure. The connecting pipe of the rainwater funnel should be fixed on the load-bearing structure of the roof, and the edge of the rainwater funnel should be closely connected with the roof. After the rainwater pipeline is installed, irrigation test should be carried out to check the leakage.

5, rigid plastic pipe installation quality control points

Attention should be paid to checking the qualified test plug-in interface and cleaning and dusting, and gluing before wiping the socket. Pay attention to wipe the remaining materials after connection.

Riser should pay attention to the installation of expansion joints, the position is 70 ~100 mm away from the floor or squatting platform; Around the buried pipeline (indoor), the top of the pipeline should be backfilled with fine sand to 100mm, covered with sieve soil, and the pipeline should not be touched during compaction.

6, sanitary ware installation quality control points

(1) When installing sanitary ware, embedded brackets or expansion bolts should be used for fixing. If it is fixed with wood screws, the anticorrosive wood brick soaked with asphalt paint should be buried in the wall, and the wood brick is lower than the clean wall10 mm.

(2) The contact surface between the ceramic parts of sanitary ware and the bracket should be smooth and appropriate, and padded if necessary. For example, when ceramic parts are directly fixed on the wall, soft washers should be added to the bolts, and they should not be screwed too tightly to prevent the ceramics from breaking.

(3) The joints between pipes and pipe accessories and sanitary ware ceramics should be padded with fillers such as rubber and putty.

(4) The fixing of the drain joint of washbasin, washbasin, washbasin and bathtub should be realized by tightening nuts, and the drain outlet should not be forcibly turned, and it should be flush with the washbasin or slightly lower than the bottom of the basin.

(5) Sanitary appliances with cold water and hot water are installed, with the cold water faucet installed on the left hand side and the hot water faucet installed on the right hand side.

(6) When installing the toilet and the female sanitary basin, a rubber pad should be added between the bottom and the touching floor.

(7) The socket joint of toilet and urinal outlet shall be filled with putty, and cement mortar shall not be used.

(8) When installing the toilet, pay attention to the coordinate deviation of the toilet, the coordinate deviation of the main flushing pipe, the hose bending or stretching too tight, the hose stretching too tight, the lap joint is short or the hose quality is not good. It is forbidden to tie the lap joint between hose and hard pipe with lead wire. The hose clamp should be fixed firmly to prevent water leakage here.

(9) The floor drain should be installed at the lowest place, and the top surface of the grate should be 5mm below the ground where it is installed.

(10) The electric heater should be equipped with grounding protection device, and it should be filled with water before being electrified during the test.

6, finished product protection

(1) After the pipeline installation is completed, the nozzle used shall be properly closed tightly to prevent the pipeline from being blocked by sundries;

(2) The installed pipes should be well protected to prevent the bearing from being used as scaffolding, especially when the riser is 2 meters below the ground, it should be bound with boards for protection;

(3) It is forbidden to use plastic pipe as the fulcrum of scaffold or the pulling point of safety belt and the lifting point of ceiling;

(4) When it is adjacent to the pipeline, it is forbidden to bake the plastic pipe with an open flame to prevent the pipeline from deforming;

(5) Before painting, the drainage pipeline should be wrapped and protected to prevent pipeline pollution;

(6) When the buried pipeline is backfilled, the surrounding and top of the pipeline should be covered with fine soil, filled manually and compacted by layers. It is forbidden to tamp the soil at the top of the pipeline with mechanical rammer such as toad rammer.

(7) Anti-freezing measures must be taken for winter construction interface;

(8) It is not allowed to set the bracket bolt device on the installed supporting pipeline;

(9) Sanitary ware installation finished product protection

When there is no ventilation in winter, the sanitary ware should be drained clean, so that there is no water in the trap to avoid freezing and cracking.

When handling sanitary ware, it is necessary to prevent bumping and protect sanitary ware and plated parts. It can also be installed uniformly before completion.

Pay attention to whether the floor drain is unobstructed and whether the household valve is closed to avoid leakage and damage to the decoration project.