Floor radiant heating construction process
Process: construction preparation → fixed branch, water collector → laying insulation layer and floor heating reflective film → laying buried heating pipe → setting door expansion joint → intermediate acceptance (primary water pressure test) → backfilling fine stone concrete layer → completion acceptance (second hydrostatictest)
First, construction preparation
1. Material requirements
(1) Pipe
When sharing the same centralized heat source water system with other heating systems, and other heating systems use corrosion-prone components such as steel radiators, the pipe should have an oxygen barrier layer to effectively prevent oxygen from infiltrating and accelerate the oxidative corrosion of the system.
a. Before the national standards are formulated, the enterprise standards of each manufacturer shall be equivalent to the international standards or advanced foreign standards.
b. The outer diameter, minimum wall thickness and allowable deviation of the pipe shall comply with the relevant requirements of the code.
(2) Quality requirements for pipe fittings
a. The body material of the fittings of the pipe fittings and the threaded parts shall be forged brass. When a PP-R pipe is used as the main pipe, the surface of the joint directly in contact with the PP-R pipe shall be plated with nickel.
b. The appearance of the pipe fittings should be complete, without defects, no deformation, no cracking.
c. The physical and mechanical properties of the pipe fittings shall comply with the requirements of the code.
d. The thread of the pipe fittings shall comply with the provisions of the national standard "non-thread-sealed pipe threads" (GB/T 7307-1987). The thread should be complete. If there is broken wire or missing wire, it should not be greater than 10% of the thread full thread.
(3) Quality requirements for insulation panels
a. Insulation board should be made of polystyrene foam, and its physical properties should meet the following requirements:
1 density should not be less than 20kg / m.
2 The thermal conductivity should not be greater than 0.050 W / (mK).
3 The compressive stress should not be less than 100 kPa.
4 Water absorption should not exceed 4%.
5 oxygen index should not be less than 32.
Note: When other insulation materials are used, other physical properties other than density should meet the above requirements.
b. In order to enhance the overall strength of the insulating sheet and to facilitate the installation and fixing of the heating tube, the surface of the insulating sheet can be treated as follows.
1 is coated with a vacuum aluminized polyester film.
2 coated with a glass cloth-based aluminum foil finish.
3 Laying a low carbon steel mesh.
2. Working conditions
(1) Design drawings and other technical documents are complete.
(2) Approved construction organization design or construction plan.
(3) Install the professionals to be familiar with the drawings and related standard atlas and draw detailed sketches of various pipeline positions and elevations. The drawings will focus on the following points and implement the following contents.
a. The elevation and geometric dimensions of the various pipes through the inner wall, the outer wall and the floor hole.
b. Selection of main materials and construction techniques of new materials.
c. Whether the ceiling elevation, floor and wall practices and thickness of the fine decoration project conflict with the installation design of the system.
d. Before the construction of the floor radiant heating system, the structure of the building should be understood, and the design drawings, construction plans and coordination requirements with the civil works should be familiar.
Second, fixed points, water collector
1. Before the floor heating construction, the floor leveling layer should be inspected.
2. The sub-cluster is fixed horizontally on the wall with 4 expansion bolts, and the installation should be firm.
Third, laying insulation layer and floor heating reflective film
1. Lay the 10mm corner insulation board along the wall with latex, and it is required to be flat and tightly lapped.
2. Lay the insulation layer on the screed (such as 2cm thick polystyrene insulation board, thermal insulation coil or imported thermal insulation film, etc.), the joint of the joint is glued firmly, and the aluminum foil or adhesive layer is laid on the floor insulation layer. The composite aluminized polyester film with coordinate grid lines, the insulation layer should be laid flat.
3. Lay a layer of Ф2mm steel mesh on aluminum foil paper with a spacing of 100×100mm and a size of 2m×1m. The laying should be tight and tight, and the steel mesh should be tied with a cable tie. The uneven or warped parts should be fixed on the floor with steel nails. When installing a waterproof layer in a room such as a bathroom or a kitchen, nailing is not allowed. When the pipe or steel mesh is warped, measures should be taken to prevent the pipe from exposing the surface.
Fourth, laying buried pipe
1. According to the floor heating design requirements, the heating pipe (PEX-A pipe) shall be fixed on the benzene board by plastic pipe clamp. The spacing of the fixing points shall be no more than 300mm at the elbow, and the distance between the straight segments shall not exceed 600mm, which is greater than Both ends and the midpoint of the 90° curved section should be fixed. The bending radius of the pipe should not be less than 8 times the outer diameter of the pipe. During the installation process, the pipeline should be prevented from being polluted. When the heating pipe of each circuit is laid, the nozzle should be blocked in time.
2. Check whether the heating pipe laid on the floor heating is damaged or not, and if the pipe spacing meets the design requirements, carry out the hydrostatic test, and inject water from the water injection exhaust valve to carry out the hydrostatic test. The test pressure is 1.5 to 2 times of the working pressure, but not Less than 0.6Mpa, the pressure drop within 1 hour of voltage regulation is not more than 0.05Mpa, and it is qualified without leakage.
Five, set the door expansion joint
Floor heating radiant heating floor when the side length exceeds 8m or the area exceeds 40m2, it is necessary to set expansion joints, the size of the seam is 5 ~ 8mm, the height is the same as the fine stone concrete cushion. When the plastic pipe passes through the expansion joint, a flexible casing with a length of not less than 400 mm shall be provided. In the dense part of the water separator and the heating pipe, the pipe is protected by a bellows not shorter than 1000mm to reduce the thermal expansion of the concrete. Fill the seam with an elastic expansion cream (or imported elastic sealant).
6. Intermediate acceptance (primary water pressure test)
The ground radiant heating system should be subjected to intermediate acceptance according to the construction characteristics of the project. During the intermediate acceptance process, the pressure is applied from the heating pipe laying and the heat medium and the water collector device are installed, and the pressure is applied again until the concrete filling layer is cured. The construction unit will work with the supervision unit.
Seven, backfilled fine stone concrete layer
After the heating pipe is qualified, the fine stone concrete is backfilled, and the heating pipe maintains a pressure of not less than 0.4Mpa; the cushion layer is applied by manual squeezing and compaction, and mechanical vibration is not allowed, and the laid pipe is not allowed to be pressed, and the fine stone concrete is close to the initial setting. At the time, the surface should be subjected to secondary tapping and pressing to prevent plastic shrinkage cracks on the axis of the pipe. After the surface is pressed, it should be moisturized for more than 14 days. After the cushion reaches the curing period, the piping system is allowed to relieve pressure.
The system hydrostatic test shall be carried out separately before pouring the concrete filling layer and after the concrete filling layer has been cured. The hydraulic test shall meet the following requirements:
1 Before the water pressure test, safe and effective fixing and maintenance measures shall be taken for the pressure test pipelines and components.
2 The test pressure shall be not less than the system static pressure plus 0.3 MPa, but not less than 0.6 MPa.
3 When conducting the water pressure test in winter, reliable antifreeze measures should be taken.
Eight, completion acceptance (secondary water pressure test)
1) When the completion acceptance is completed, the following documents should be available:
1 Construction drawings, as-built drawings and design change documents.
2 Inspection certificate and factory certificate for main materials, parts and components.
3 intermediate acceptance records.
4 pressure test and flushing records.
5 Engineering quality inspection and evaluation records.
2) Completion acceptance criteria:
1 The quality of completion meets the design requirements and the relevant provisions of this regulation.
2 The surface of the filling layer should not have obvious cracks.
3 Pipes and components are free of leakage.
4 The valve is flexible and close tightly.
After the completion of the distributor after the heating branch pipe, the water temperature and pressure of the entire water supply loop should be debugged. When supplying water to the floor heating system, the preheating method should be used. The temperature of the hot water supply should not rise suddenly. The initial water supply temperature should be 20 °C ~ 25 °C for 3 days, then keep the maximum design temperature for 4 days, and ≤ 50 °C. The water temperature is running normally. The floor heating installation is over.
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