2. Before installation, according to the size of ventilation flue, hang vertical holes from the top to ensure the verticality of flue installation.
3. When installing the first layer, first level it with 1:2 cement mortar. After the first section of pipe joint is grouted, C20 concrete about 40cm high is poured in the pipe; After the concrete is finally set, install the upper ventilation flue.
4. First, put the lower mouth of the joint into the upper mouth of the lower flue partition, and seal its four sides with cement slurry. Ventilation flue should be supported by layers. Construction practice: After grouting the upper and lower pipes, the interface of the upper and lower ventilation flue is generally located at the floor, so the Ф12 steel bar is welded at the embedded steel plate at the root of the pipe and welded with the steel bar reserved in the hole, and supported on the floor foundation.
5. Coat the upper and lower joint surfaces of ventilation flue with polymer cement slurry (108 glue: cement = 6:1); The joint between ventilation flue and floor slab should be cut in advance, cleaned and closed, and filled with C20 fine stone micro-expansive concrete.
6. The concrete surface at the joint should be about 3 cm lower than the floor. After concrete pouring, water is stored on the concrete surface for curing.
7. After the position of ventilation flue foot is cleaned, do it twice, with a height of 20cm and a thickness of 2mm of 85 1 polyurethane waterproof coating; Or tamp the reinforced concrete water-retaining base surface around the foot of ventilation flue, 1: 2.5 cement mortar batch polishing, and the water-retaining base surface batch polishing should be completed before the cement sand finishing layer on the ground. However, it is necessary to reserve reinforcement when tamping fine stone concrete seal.
8, before the batch swing or decoration, should be hung on the periphery of the ventilation flue net.
9, ventilation flue seam between the two layers, the upper and lower ventilation flue joint surface should be coated with polymer cement slurry, and then the exposed part of the interface is wrapped with galvanized steel wire mesh, and the embedded steel plates of the upper and lower pipes are welded with φ 6 steel bars.
10. After the ventilation flue is installed on the roof, the backflow prevention covers required by different series of products shall be installed according to the design requirements.
Extended data:
There are four common flue installation methods:
A, single flue type
The single flue is a rectangular smoke pipe, which goes straight through the whole floor. When it is installed, there will be an air inlet connected to the range hood. Every household discharges the oil fume into the flue through the tuyere, and then discharges it outdoors.
Second, the main and auxiliary flue
1. The main and auxiliary flues are generally two parallel flues, some are concentric circles, some are two parallel rectangles, and the flues are also straight through each floor. Construction workers usually set this flue on each floor of the house, and there will also be an air inlet connecting the range hood and the flue. In this way, the main flue and the secondary flue gas can meet at the interval of the air inlet.
2. Flue gas is pushed into the secondary flue through the range hood. With the propulsion of the range hood and the buoyancy of the lampblack temperature, the lampblack can enter the main flue again after rising for a period of time and be discharged from the roof.
Three. Variable pressure flue
Variable pressure flue is to make each layer of flue into different sections. By changing the flue section and using various physical principles and laws of flue gas activity, the airflow is discharged upwards. Its essence is to use the Bernoulli equation of aerodynamics to make changes in space, so that the oil fume can be discharged more easily.
Four, check valve flue
Non-return valve flue is to add an interface to the air inlet of single-pipe flue. This valve mainly depends on the force generated by the flow of flue gas in the pipeline to open and close. In modern residential design, it is a very environmentally friendly design and the first choice for new high-grade residential areas. For example, the five-prevention check valve produced by Wanju is typical, which can not only meet the problem of preventing cross-linking of lampblack, but also prevent mosquitoes and fire.
Five, the installation of flue should also pay attention to the following points: first, we must keep the auxiliary flue, because with the auxiliary flue, we can separate the lampblack family well and completely prevent the lampblack from smelling; Secondly, the installation position and length of the range hood are very important during construction. It is suggested that the pipe of range hood should be as short as possible.
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