Injection concrete is known in the country under the names: "colcret", "Polcret" or "prepact - concret". The method of its execution consists in filling the mold with a thick aggregate constituting the concrete skeleton, that is, about the diameters 40 do 80 mm, a …
Monthly Archives: January 2015
Concreting using a floating form
Concreting using a floating form – It is a technique similar to the slide concreting method, invented by the Swedish company Ab. Hydro Concrete. The concrete mix is poured continuously in a floating manner, a sealed form with a prefabricated bottom. The concrete level rises and …
Hot paint spraying
Advantages of hot spraying:
1) consistency of the applied material, suitable for spraying, is obtained with less solvent;
2) because the material contains less solvent, covers the treated surfaces better, which is especially noticeable at the corners;
3) for hot spraying …
Advantages and disadvantages of pressure spraying
Possible causes of the following malfunctions in the operation of the high-pressure sprayer:
a) if liquid drops are leaking from the spray gun, means, that the paint needle is loose or that a foreign body has entered the nozzle, which caused it to leak;
b) …
Paint spraying equipment
Spray equipment
The following solutions are distinguished in spraying devices:
1. Manual spray pump: the necessary air pressure is generated by means of a hand pump, and the spray pressure is 5-20 bars.
2. Spray nozzle: the spray pressure is generated by the propellant; totals …
Seasonal heat demand for heating
The measure of the energy standard of a building is an indicator called the seasonal heat demand for heating E, which determines the amount of heat related to the area or volume)’ the building needed to be heated during the year. It is expressed in kWh /(m2 • rock) or in …
Fire ventilation cut-off dampers
Fire ventilation cut-off dampers, unlike fire dampers, in the waiting position, that is, during the normal operation of the facility – remain closed. If a fire is detected in a given fire zone, the command to open the ventilation cut-off dampers is transmitted from the CSP …
Fire resistance of building elements
Fire resistance is determined in order to assess the performance of a given building element, when subjecting his sample to specific conditions of heating and pressure. The fire resistance of a test piece is expressed in time, by which the relevant classification criteria are met.
Fire resistance test
Rule …
Installation of ventilation and air conditioning
Ventilation ducts and any inspection doors used in them should be made of non-flammable materials, and combustible thermal and acoustic insulation as well as other combustible cladding of ventilation ducts may be used only on their outer surface, in a way that prevents the spread of fire. …
Movement of smoke in a building structure
The basic factors causing the movement of smoke in a building are:
– chimney effect,
– heat emitted during a fire,
– Atmospheric conditions, especially wind and temperature,
– operation of mechanical air transport systems.
Floating is observed within the fire compartment …