Construction scheme of floor heating project
Part I: Construction scheme of floor heating project 1. basis of compilation
1, Phase II and Phase III construction drawings of Shi Sheng Chang 'an Community;
2, the fourth edition of the construction manual;
3, the construction site conditions;
4. The company's experience in similar projects.
Second, the project overview
Shi Sheng Chang 'an Residential Quarter Phase II Project is located at the southwest corner of the intersection of Chang 'an Road and Jingtang Street in Feixiang County, Hebei Province. The heating system of this project adopts floor low-temperature radiant heating, and the construction scope of floor heating is kitchen, bathroom, bedroom and living room.
Third, the project preparation
1. technical preparation: the design and construction drawings and related technical documents are complete, and the blue prints.the design and design disclosure have been completed.
2. Material preparation: All materials must have quality certificates before entering the site, and the specifications, models and performance and technical indicators should comply with the provisions of the current relevant national standards. .
2. 1. PE-RT floor heating pipe is used as the heating pipe, and the pipe specification is De20×2.3(S5).
2.2. Connecting pipe: PE-X pipe is used as the connecting part between the water separator and the meter box.
2.3. Insulation layer: 30 thick composite aluminum foil extruded polystyrene insulation board.
2.4. Filling layer: 60mm thick C 15 pisolite concrete.
2.5, other auxiliary materials.
3, machine preparation:
3. 1. Machines and tools: fine stone concrete mixer, pumping equipment, special wrench, electric pressure test pump, etc.
3.2 Tools: saw blade, hammer, adjustable wrench, manual pressure test pump, scraper, etc.
3.3 Measuring tools: level gauge, steel tape measure, pressure gauge, bending ruler, wire pendant, etc.
Fourth, the construction methods and measures
1, operating conditions
1. 1, the construction site has water supply or power supply conditions and temporary facilities for storing materials.
1.2, wall plastering has been completed in civil engineering, and the ground is cleaned up; The waterproof construction of kitchen and toilet has been completed, and the closed water test has been completed and accepted.
1.3, related electrical pre-embedding and other projects have been completed.
1.4, the construction personnel should be trained, especially the mechanical interface construction personnel must be trained in professional operation and hold a certificate.
1.5, and the ambient temperature during installation should not be lower than 5℃; When working in an environment below 0℃, measures should be taken to raise the temperature on site.
1.6, it is not suitable to cross work with other types of work during construction, and all ground holes should be completed before the construction of filling layer.
2. Construction technology: installation preparation → base surface cleaning → insulation layer laying → heating pipe installation → water separator and water collector installation → flushing pressure test → filling layer construction → inspection and debugging.
3. Key points of construction:
3. 1. Cleaning the base surface and leveling: Before the construction of the insulation layer, clean the ground without sand and gravel fragments, steel bar heads and inorganic aluminum salt waterproof mortar twice, leveling and calendering, and finish the waterproof protection layer of the bathroom.
3.2. Insulation layer construction: The insulation layer adopts 30 mm thick composite aluminum foil extruded polystyrene insulation board. ..
3.3, heating pipe installation
3.3. 1, the laying area of each 15~25m2 is a circle, and the length of each circle of heating pipes shall not be greater than 100m. A loop is added to the room, and the length of the heating pipe in the loop exceeds 100 meter.
3.3.2, heating pipe layout spacing is 300 mm .. The rotary pipe laying method is adopted.
3.3.3, according to the requirements of design drawings, pay-off and piping. The heating pipes of the same channel should be kept horizontal.
3.3.4. There should be no joint for the heating pipe buried in the packing layer. If it is inevitable, it should be set in a place where it is convenient to open the cover or fill in the leak.
3.3.5, heating pipe installation should prevent pipe distortion; When the pipeline is bent, the top of the arc should be limited and fixed with a pipe clamp, and "dead folding" is not allowed; The bending radius of plastic pipe should not be less than 6 times the pipe diameter.
3.3.6. When the pipe spacing is less than 100mm, measures such as setting flexible sleeves outside the heating pipes should be taken near the densely arranged parts of heating pipes such as water separators and water collectors.
3.3.7, heating pipe out of the ground to the junction of water separator, water collector, bending part should not be exposed to the decorative layer on the ground. The exposed pipe section between the heating pipe protruding from the ground and the ball valve interface at the lower part of the water separator and water collector shall be externally provided with plastic sleeves. Casing shall be higher than decorative floor 150 ~ 200mm.
3.3.8. The heating pipe is connected with the water separator and the water collector, and is fixed on the insulation layer with U-clips and U-nails. .
3.3.9 Both ends of the heating pipe elbow shall be provided with fixing clips; The fixed point spacing of heating pipeline should be 0.5~0.7m for straight pipe section and 0.2 ~ 0.3m for bent pipe section. ..
4. Installation of water separator and water collector
4. 1, water separator and water collector shall be installed before laying heating pipes. When installed horizontally, the water separator should be installed at the top and the water collector should be installed at the bottom. The center distance should be 200mm, and the allowable deviation is10mm; The center of the water collector should be more than 300 mm from the ground.
4.2, valves, water separator, water collector components before installation, strength and leak test should be done. Each batch shall be randomly selected 10% for testing, and there shall be no less than one. Valves installed at the inlet of the water separator, the outlet of the water collector and the bypass pipe shall be tested for strength and tightness one by one, and can only be used after passing the test.
4.3. The strength test pressure of the valve shall be 1.5 times the working pressure; The leak test pressure shall be 1. 1 times of the working pressure, and the duration of the strength and leak test for valves with a nominal diameter of not more than 50mm shall be 15s, during which the pressure shall remain unchanged, and there shall be no leakage in the shell, packing and sealing surface.
5. Flushing and pressure testing
5. 1. Hydrostatic test shall be conducted after the system is flushed. Flushing should be carried out after the main supply and return pipe outside the water separator and water collector are qualified, and then the indoor heating system should be flushed.
5.2. The hydrostatic test shall be conducted twice before the concrete filling layer is poured and compacted and after the curing period of the filling layer expires; Hydrostatic test should be carried out loop by loop for each group of water separator and water collector.
5.3. The test pressure shall be 1.5 times of the working pressure, but not less than 0.6MPa. Under the test pressure, keep the pressure constant 1h, and the pressure drop shall not be greater than 0.05MPa.
5.4, hydraulic pressure test appropriate USES manual pump slowly booster, observe and monitor at any time in the process of booster, can not have leakage; Air pressure test should not be used instead of water pressure test.
5.5 Before the water pressure test, safe and effective fixing and protection measures shall be taken for the pressure test pipes and components.
5.6, water pressure test should be carried out according to the following steps:
5.6. 1, slowly inject water through the water separator, and exhaust the air in the pipeline at the same time.
5.6.2 After being filled with water, conduct water tightness inspection.
5.6.3. Use the pressure test pump to slowly boost the pressure, and the boosting time shall not be less than 15 minutes. Observe the interface during pressurization. If leakage is found, stop immediately, reduce the pressure to zero, and then pressurize the interface after treatment.
5.6.4 After boosting to the specified test pressure, stop boosting and stabilize the pressure for 65438+/-0h, and observe whether there is water leakage.
6, filling layer construction:
6. 1. The filling layer is made of 60mm thick C 15 pisolite concrete, and an appropriate amount of cracking agent is added.
6.2 During the construction of pisolite concrete filling layer, the water pressure in the heating pipe should not be lower than 0.6MPa；; In the process of filling and curing, the system water pressure should not be lower than 0.6MPa.
6.3, fine stone concrete filling layer construction, it is forbidden to use mechanical vibrating equipment; Construction personnel should wear soft-soled shoes and use flat-headed shovels.
6.4 Before the system starts heating, the curing period of the fine stone concrete filling layer should not be less than 21d.. During construction, protective measures should be taken for the ground, and it is forbidden to overload, bake at high temperature, and directly place high-temperature objects and high-temperature heating equipment on the ground.
6.5. The filling layer of fine stone concrete shall be poured and cured, and the temporary pipeline for pressure test shall not be removed temporarily, and the system pressure shall be kept at 0.6MPa.
6.6. When the junction with the wall and column and the length of the filling layer is more than 6m, the soft closed-cell foam with thickness ≥ 10mm shall be filled as the thermal expansion compensation structural measure of the fine stone concrete filling layer.
7, bathroom kitchen floor heating construction
7. 1. The bathroom and kitchen should be separated by two floors.
7.2. A water-stop wall should be set at the door of the bathroom kitchen, and the inside of the water-stop wall should be waterproof with the civil engineering specialty. Waterproof measures should be taken where the heating pipe passes through the water stop wall: waterproof plastic rings should be inserted where the heating officer enters the bathroom kitchen.
8. Inspection and debugging
8. 1. The radiant floor heating system shall not be operated without debugging. The operation and debugging of floor radiant heating system should be carried out under normal heating and power supply conditions. The debugging of floor radiant heating system shall be carried out by the construction unit with the cooperation of the construction unit. The debugging and trial operation of radiant floor heating system should be carried out after the completion of construction and the expiration of the curing period of concrete filling layer, and before the formal heating operation.
8.2 When heating for the first time, the hot water temperature should be gentle, and the water supply temperature should be controlled at 20℃ ~ 25℃; And should run continuously for 48 hours; After that, the water temperature increased by 3℃ every 24 hours until it reached 55℃. At this temperature, the heating pipes connected to each water separator and water collector should be adjusted one by one until the design requirements are met.
8.3. The heating effect of the radiant floor heating system should be based on the temperature indicated by the black ball thermometer at the center of the room 1.5m from the ground, as the basis for evaluation and testing.
9, finished product protection
9. 1. During construction, paint, asphalt or other chemical solvents should be prevented from contacting and polluting the heating pipeline.
9.2 During the construction of floor radiant heating project, it is forbidden to trample on heating pipes.
9.3 After the installation of pipeline system is interrupted or exposed, it shall be blocked at any time.
9.4, packing layer should be done before construction coil appearance inspection, prevent knock against, impact or trample when installation.
9.5. It is forbidden to climb the heating pipe, use it as a support or borrow it for other purposes.
9.6, concrete filling layer is poured concrete and curing process, it is forbidden to trample into.
9.7. After the curing period of concrete filling layer expires, the ground where heating pipes are laid should be clearly marked and properly protected. It is forbidden to run heavy objects or place high-temperature objects on the ground.
Verb (abbreviation of verb) Safety and environmental protection measures
1 Indoor electrical equipment should be watched and used by special personnel to prevent electric shock.
2 When handling heavy objects such as pressure pump, cross-linked plastic pipe coil, steel mesh coil, etc., attention should be paid to the fact that the feet do not slip or step on the air when going up and down the stairs, and care should be taken before and after handling heavy objects.
3 When mixing and transporting concrete, attention should be paid to the cleanliness and dryness of the ground to prevent slipping during cross operation.
Six, quality standards
1, master project
1. 1. There should be no joint in the buried part of the coiled pipe laid underground.
1.2. Before the coil is concealed, the water pressure test must be carried out. The test pressure is 1.5 times the working pressure, but not less than 0.6MPa.
1.3, the bending part of the heating coil shall not be hard bent, and the radius of curvature shall meet the following requirements:
1 plastic pipe: it should not be less than 8 times the external diameter of the pipe.
2 composite pipe: it should not be less than 5 times the outer diameter of the pipe.
2. General items
2. 1 min, the model, specification, nominal pressure, installation position and height of the water collector shall meet the design requirements.
2.2, heating coil pipe diameter, spacing and length should meet the design requirements. The spacing deviation is not more than 65438 00 mm.
2.3, moistureproof layer, waterproof layer, insulation layer and expansion joint should meet the design requirements.
2.4, filling layer strength label should comply with the design requirements.
3. The quality acceptance of inspection lot and subdivisional work shall be carried out with reference to Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering (GB50242-20XX).
Part II: Floor Heating Construction Scheme (2685 words) I. General situation of the project.
Dahongmen, Fengtai District, Chaoyang District, Beijing. The total construction area is 22,258.68m2, the residential building area is14,253.68m2, the balcony building area is 777.6m2, and the building basement area is 2,669m2. Underground 1 floor, underground 1 floor-2 floors above ground, the building is commercial and 3-3 floors above ground.
Two. Compilation basis/standard
2. 1 Code for Design of Water Supply and Drainage in Buildings (GB500 15-20XX)
2.2 Code for Residential Design (GB50096- 19999)
2.3 Code for Fire Protection Design of High-rise Civil Buildings (GB 50045-95) (version 20xx)
2.4 Code for Design of Automatic Sprinkler Fire Extinguishing System (GB 50084-20xx) (version 20xx)
2.5 Code for Design of Fire Extinguishers in Buildings (GB50 140-20XX)
2.6 Code for Design of Heating, Ventilation and Air Conditioning (GB500 19-20XX)
Three. Overview of indoor floor heating project;
935 13 indoor floor heating project of the military complex building, our unit is mainly responsible for the indoor floor heating system project of the complex building. Wall-mounted gas stoves are used in this project, with PP-R pipes as branch pipes, PE-RT coil pipes as buried pipes for indoor radiant heating, pure copper chrome-plated materials as water distributor and water collector, and national standard plate painting technology as water distributor and water collector, and the working pressure of the system is 0.2MPa.
Fourth, the planned time limit for a project:
The planned commencement date is 20XX March 1 day, and the completion date is 20XX May 24th.
Verb (abbreviation for verb) people and machinery:
There are 20 construction personnel, and the construction team is responsible for the construction. The main construction equipment of indoor floor heating system is as follows:
(1), construction preparation
1. Before floor radiant heating construction, you should know the structure of the building and be familiar with the design drawings. Construction plan and other work cooperation measures. Installers should be familiar with the general performance of pipelines and master the basic operation points. Blind construction is strictly prohibited.
2, heating pipe installation, should check the appearance of the material, and remove the dirt and debris inside and outside the pipeline and pipe fittings.
3. During installation, paint, asphalt or other chemical solvents should be prevented from contacting PE-RT pipes and fittings, and measures should be taken to prevent the pipes from being stabbed by sharp objects.
4, pipeline system installation intermittent or finished product mouth, should be blocked at any time.
5, insulation layer should be laid on the basis of flat.
6. According to the requirements of design drawings, the same channel of pipes and heating pipes should be kept level.
7. The bending radius of heating pipe and PE-RT pipe should not be less than 5 times the pipe diameter.
8. There should be no joint for the heating pipe in the packing layer.
9, use special tools to break the pipe, fracture should be smooth, fracture should be perpendicular to the radial direction of the pipe.
(2), the construction operation process
1. requirements for leveling layer: before the construction of floor heating project, the ground shall be flat and free of unevenness, sand and gravel fragments and steel bars. Therefore, civil engineering is required to level with cement mortar to clean the ground. The conduit is only allowed to pass vertically through the geothermal layer. When the living room with an area greater than 30㎡ passes through the door and the length is greater than 6m, a certain expansion joint should be set and filled with elastic expansion material.
2. Installation of distribution manifold
Answer: It should be vertical to the ground and firmly fixed on the wall.
B: The height of the riser shall be not less than 150mm and not more than 700mm, and the installation positions of distributors on each floor shall be the same.
3. Laying of thermal insulation layer: laying moisture-proof layer, 2 "extruded board and reflective film on the leveling layer.
4. Laying of cryogenic pipelines
Answer: Loop requirements: Construction, finished product protection and compaction shall be carried out in strict accordance with the system design scheme.
B: Pipe fixing: the heating pipe should be fixed on the surface of the insulation layer with a card.
5. Requirements for protective layer of coiled material: the protective layer of pea stone filled concrete is 50㎜.
6, pressure test, no leakage to meet the design requirements for qualified.
7. Acceptance and handover
(3) Precautions
1, after the pressure test is qualified, the pebble concrete filling layer is poured, the label is not less than C20, the pebble particle size is not greater than 12mm, and a proper amount of anti-cracking additives are added.
2. The maintenance period of the coil protective layer shall be no less than 48 hours.
3. In the process of pouring and curing the concrete filling layer, the system pressure should be kept not less than 0.8Mpa.
(4), the ground floor construction
1. After the curing period of the filling layer expires, the ground layer can be constructed.
2. During the construction of stratum and its leveling layer, it is not allowed to chisel the filling layer or wedge nails in the filling layer.
(5), production safety and finished product protection
1, heating pipes and insulation materials shall not be in direct contact with open flames.
2. It is forbidden to climb, support or borrow heating pipes and water separators.
3. In the installation process of floor radiant heating, it is not suitable to cross with other construction operations at the same time, and it is appropriate to construct in layers or units independently.
4. During the pouring and curing of the concrete filling layer, it is forbidden to step on it. After the expiration of the maintenance period, the ground where heating pipes are laid should be clearly marked and properly protected. It is forbidden to run heavy objects or place high-temperature objects on it to avoid planing or nailing objects.
5. If the floor heating operation is adjacent to the outdoor without shelter, corresponding shelter measures should be set.
(6) Construction method
A. Installation of water distributor (collector)
(1) The distribution manifold is fixed, the water separator is installed outside, and the water collector is installed inside. Generally, the distribution manifold is about 250mm and 400mm from the horizontal ground, and the height difference is about150 mm.
(2) The distribution manifold shall be installed horizontally and vertically, and the vertical plane and horizontal plane of the coil connected with the distribution manifold shall be vertical.
(3) The distribution header shall be installed in a staggered ring according to the design requirements, so as to facilitate maintenance.
(4) After the distribution manifold is installed, clean up the oil stain in time.
(5) After the distribution manifold is connected with the coil and qualified by crimping.
B, extruded board laying and pay-off marking
(1) extruded board laying
(1) before and after laying extruded board, carefully check whether the room size, function and wall position of the building are consistent with the design drawings.
(2), thermal insulation materials laid on a flat structure layer or flat ground, laid flat, lap tightly, edge seam is dense.
(3) For the laying of irregular parts such as doors, the back knife shall be laid according to the actual shape.
(4) Parts with special requirements for suspended ceiling, such as toilets and kitchens, shall be cut according to design requirements to protect the waterproof layer.
(2) Indicate the dimension of the sideline starting from the wall.
(3) Before the coil, the quality inspector shall recheck it according to the design drawings, and it can be transferred to the next working procedure only after it is confirmed.
C, coil pipe
(1) Prepare PE-RT pipeline according to design requirements.
(2) Cut the pipe with special scissors. The fracture surface should be smooth and perpendicular to the pipe axis.
(3) Each loop is a pipe, and no joint is allowed in the pipe during installation.
(4) The coil shall be installed from the distribution manifold and fixed on the surface of the insulation layer with a card.
(5) The fixed point spacing of PE-RT pipeline, with the straight pipe section set at 500mm spacing and the bent pipe section set at 300mm spacing.
(6) The part of PE-RT pipe from the ground to the water separator should be covered with plastic sleeve to prevent local photoaging.
D, inhibition test
(1) After completion, conduct two compression tests according to the design requirements.
(2) The press medium is clean water, and the press tool is a simple press pump.
(3) Pressure test for the first time after installation of the coil system, that is, each subsystem is connected with each loop of the water collector system for pressure test, and the pressure test is 0.8MPa gauge pressure. If the pressure does not exceed 0.05MPa within one hour, it is qualified. After being signed by the supervisor, the civil contractor can be notified to carry out concrete pouring under pressure.
(4) The second grouting is to grout the pumped mortar with coiled material after solidification. The pressure test shall be conducted at a gauge pressure of 0.8MPa, and the pressure drop within one hour shall not exceed 0.05MPa, and the pressure gauge shall be recorded in detail. After the signature of the supervisor, Party A and Party B shall complete the handover in the form of signature.
E, completion settlement
Collect and sort out construction drawings, various signing procedures for completion acceptance, etc.
Collect finishing tools and all kinds of remaining installation materials.
Six, matters needing attention:
1. In the process of construction, strictly control the quality, establish and improve various quality management systems, and implement the system of "three works and three inspections", that is, disclosure before construction, inspection and guidance during construction, summary and evaluation after construction, self-inspection, mutual inspection and handover inspection. See the quality assurance system block diagram for details.
2. Strengthen safety production education, raise awareness of safety production, strictly implement the policy of "safety first, prevention first", strictly implement the Safety Law and the safety and quality guidelines, policies and regulations issued by all levels, and regularly inspect all workplaces to prevent all kinds of accidents.
3. Strictly obey the management of the owner and supervisor in the construction, and correct the problems in the construction in time.
Chapter III: Construction Scheme of Floor Heating Project When products such as radiator valves, meters, pipes and insulation materials used in energy-saving heating system project enter the site, they shall be inspected and accepted according to the design requirements, and the corresponding acceptance records shall be formed after inspection and approval by the supervision engineer (the representative of the construction unit). The quality documents and relevant technical data of various products and equipment shall be complete and conform to the current relevant national standards and regulations.
Process flow: installation preparation → prefabrication → main pipeline installation → riser installation → branch pipe and heating pipeline installation → system pressure test.
Indoor heating system installation:
The heating system adopts low-temperature floor radiation heating mode, PVC or flexible protective pipe is set at the joint between the floor heating pipe and the water separator, and pe sleeve is added to the floor heating pipe through the wall. Expansion joints shall be made of high foamed polyethylene foam or filled with elastic swelling paste. The leak test pressure of the system in the water separator shall be not less than the static pressure of the system plus 0.3Mpa, but not less than 0.6Mpa. The backfill layer shall be made of C20 fine stone concrete, plastered with boards as it is filled, and leveled as a whole. There is a water stop at the entrance of the bathroom, and the backfill layer of the bathroom is made of waterproof concrete.
Construction requirements and precautions of floor heating: before construction, the protruding part of the ground should be leveled, and the recessed part should also be leveled. Clean up the sand and gravel, keep the ground smooth and free of sundries, and the corner and column angles are at right angles to the ground.
(1) Carry out the construction in strict accordance with the design drawings and strictly control the pipe spacing.
(2) When the pipeline is unloaded and transported, it should be handled with care, and violent collision and object collision are not allowed to avoid scratches and contact with oil.
(3) Pipes should be placed in a dry and cool warehouse and stacked on a flat site. Dirt and sundries are prohibited from entering the pipeline.
(4) Before the installation of the floor heating pipeline, all pipes and wires under the floor heating pipeline should be in place, and the underground trench should be filled.
(5) During pipeline construction, the room temperature should be higher than 5℃.
(6) Casing shall be added when the pipeline crosses the wall or floor and ground. The diameter of the casing is one size larger than the diameter of the pipeline, and both ends of the casing protrude 50mm from the wall or floor.
(7) The quality of pipes shall meet the requirements of relevant national standards, and the damage to pipes shall be strictly prevented during construction. Nailing and perforation are strictly prohibited when decorating the ground.
(8) Pressure test: According to Technical Specification for Radiant Floor Heating (JJ142-20xx).
(9) In the process of construction, strictly implement the provisions of relevant national codes and regulations.
Pipeline installation:
(1) Piping and connection: the main heating pipe in front of the water collector and water separator adopts low-pressure fluid welded steel pipes, with threaded connection below DN32 and welded connection above DN32. The floor heating coil adopts PE-X tube.
(2) Selection of valves: copper ball valves are used in front of the water collector and water separator, and gate valves are used at the bottom of the heating riser;
(3) Steel sleeves with a pipe diameter of Grade 2 larger than that of the pipeline shall be installed in the wall and floor, and the top of the sleeve installed in the floor shall be 20mm higher than the ground. The bottom is flush with the floor, the two ends of the sleeve in the wall are flush with the decorative surface, and it passes through the pipeline in a humid room such as a bathroom. The sleeve is filled with sesame oil between the pipelines, and the series pipeline needs secondary bending.
(4) The spacing of pipe supports is shown in the following table.
(5) The pipeline installation elevation marked in the drawing shall be subject to the pipeline center. If the slope is not marked, the slope should be i=0.003-0.005 to the drainage point. (6) Exhaust and drainage devices are respectively arranged at the highest point and lowest point of the system.
The water pressure test of hot water system is carried out under the working pressure of 0. 1MPa, but the apex pressure of the system should not be less than 0.3MPa, and the pressure drop should not be greater than 0.02MPa within 5 minutes.
Before the hot water pipeline is put into use in return pipe, it must be washed with clean water. When flushing, it should be carried out under the maximum pressure and flow rate that the system can reach. Only when the water color and transparency of the outlet are consistent with the visual inspection of the inlet can it be qualified.
Supervisor installation: Install the supervisor on the basis of pipe rack installation and pipeline processing. Main pipe installation starts from the entrance or branch point and extends from the main riser to the end. When welding connection is adopted, firstly, straighten the pipe, clean the pipe cavity, and transport the pipe to the installation site. The installation procedure starts from the first section. Align the pipe in place, align the nozzle to make the reserved port direction accurate, and weld after alignment. The connection between the main pipeline and the main riser should avoid T-connection. For the hot water heating main pipe, the reducer should be straight, and the heating main pipe should not have concentric reducer.
After pipeline installation, check whether the coordinates, elevation, reserved mouth position and pipeline diameter change are correct, then straighten it, check and check the pipeline slope with a level meter, and then adjust the U-clamp of elevator bolt to make it moderately elastic and smooth.
Installation of riser: the riser and the main pipe should not be connected by T-shape, but by elbow or elbow to form a natural compensator. When the riser passes through the floor, it is necessary to hang the line to ensure that the riser clamp and the reserved casing are on the same vertical line.
When installing the riser, the branch pipe interface should be kept well, and the height difference required for the branch pipe slope should be calculated. During installation, start from the first section according to the number, apply lead oil to the threaded mouth of the riser, wrap it with hemp, and tighten it with a pipe wrench until the tightness is moderate, which is in line with the marking requirements during straightening. The thread is exposed for 2 ~ 3 times, the reserved mouth is straight, and the exposed hemp at the nozzle is removed. Then, after checking whether the elevation, direction and semicircle bend of each reserved opening of the riser are accurate and straight, loosen the embedded pipe clamp, put the pipe into the pipe clamp and tighten the bolt, use the derrick and wire drop to find the verticality from the first section of the pipe, straighten the steel casing, and finally fill the hole. The reserved opening must be temporarily blocked.
Installation of branch pipe: measure the size of branch pipe, subtract B bend, then break the pipe, cover the wire, simmer B bend and straighten it, coat both ends of B bend with lead oil and wrap it with hemp, then connect the radiator and clean the hemp head.
Installation of pipeline support:
Marking positioning: based on the design elevation, calculate the datum plane of the support according to the slope, and find out the center coordinates of the support.
The embedded bracket should be chiseled according to the scribing, and then the prepared bracket should be implanted to meet the design requirements. Fix the bracket with stones, then flush the hole with water to clean the floating dust, and finally fill the hole with mortar to make its surface 2 ~ 3 mm lower than the wall.
Welding bracket: firstly, clean the embedded parts to make their surfaces clean. Then, after the prefabricated bracket is adjusted in place, spot weld the bracket and embedded parts. After the bracket elevation is calibrated, welding shall be carried out.
When using the expansion bolt to fix the bracket, the drilling depth should be moderate, not skewed, the drilling position should be accurate, and the embedded parts such as steel bars and pipes should be avoided.
Install the riser pipe clamp: when installing the riser, hang the vertical line to ensure that it is on the same vertical line with the casing passing through the floor.
Heating pipe installation:
The heating coil is made of crosslinked polyethylene (PE-X), and its diameter is dn20. The diameter of the cylinder of the water collector and water separator is DN32, and the manufacturer of the product is determined by Party A. The floor heating pipe is arranged on the upper part of the insulation layer and fixed with clips. The clip spacing of straight line segments is 400 mm, and the clip spacing of curve segments is 150 mm. Expansion joints should be added to the ground along the wall, through the door, and at the position > 6.0m in vertical and horizontal directions, and the floor heating pipes passing through the expansion joints should be sleeved.