Key points of construction technology for the most

2022-07-31
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Key points of construction technology for fire protection system

(I) key points of installation technology for fire extinguishing system

1 If the diameter of indoor hydrant water supply pipe of hydrant fire extinguishing system is 100mm, screw connection shall be adopted; Flange or clamp type connection shall be adopted for more than 100mm. Valves are usually gate valves or butterfly valves. The installation of fire hydrant box is divided into open installation, concealed installation and semi open installation. If the pipeline passes through the reinforced concrete water tank wall, rigid or flexible waterproof casing shall be installed. Safety valve, pressure gauge, drain pipe, water level indicator, fire pump, etc. shall meet the specification requirements. When the temperature of the above ground and underground fire pump adapter installed outdoors is below 20 ℃, this article mainly introduces the use and operation method of the friction and wear testing machine. Appropriate thermal insulation measures should be taken to prevent freezing

2. When the nominal diameter of the pipe of the automatic sprinkler system is 100mm, the threaded connection shall be applied; Others are connected by welding or flange. The horizontal distance of sprinkler arrangement shall be determined according to the fire hazard level. For the installation of alarm valve group, water source control valve and alarm valve shall be installed first, and then the auxiliary pipeline of alarm valve shall be connected. The hydraulic alarm bell shall be installed on the external wall near the public passage or duty room for easy maintenance

3. The pipeline of dry powder fire extinguishing system includes gas pipeline and dry powder pipeline, which shall be clean without corrosion

4. Before the construction of the gas fire extinguishing system, visual inspection shall be carried out for the system components such as the extinguishing agent storage container, container valve, selector valve, liquid check valve, nozzle and valve driver (from the perspective of cost performance). Before the installation of the system, the filling volume and pressure of the extinguishing agent in the storage container shall be checked, and the hydraulic strength test and pneumatic tightness test shall be carried out one by one for the selector valve, liquid check valve, high-pressure hose and the gas check valve in the valve drive (starting) device. No irrelevant personnel are allowed to enter the storage area of the container. The carbon dioxide storage container (bottle group) and its supporting container valve, one-way valve and collecting pipe shall be set in a special room. The gas fire extinguishing pipeline installed in places with combustible gas, steam or dust that may cause explosion hazards shall be equipped with anti-static grounding device

(II) key points of construction technology for automatic fire alarm system

1 The piping and wiring of the automatic fire alarm system shall comply with the provisions of the current national standards

2. Fire detectors are divided into five basic types: temperature detectors, smoke detectors or photosensitive detectors, gas detectors and composite detectors. The horizontal distance between the detector installation and the wall and beam edge is 0. 5m 。 There shall be no shelter around the detector. Horizontal distance from detector to air supply outlet 1. 5m。 The installation spacing of temperature detectors shall not exceed 10m, and the installation spacing of smoke detectors shall not exceed 15m. The detector should be installed horizontally. When it is installed obliquely, the inclination angle is 45 ℃

3. The manual fire alarm button is installed on the wall at a height of 1 from the ground (floor). 5m. It shall be installed firmly without tilting. The external conductor of the button shall have a margin of more than 10cm

4. The fire alarm controller is installed on the wall, and its bottom edge is 1 high from the ground (floor). The sampling rate at 5m can reach 2000 times/s, which can capture the instantaneous change process of the force, and the resolution of the whole process is up to 500000 graduations. When installed on the ground, the bottom edge is 0 higher than the floor. 1~0。 2m。 The main power supply of the controller shall be directly connected with the fire power supply, and the grounding of the controller shall be firm

5. Before installation of fire control equipment, functional inspection shall be carried out, and the ends of external wires of fire control equipment shall be clearly marked

6. The working grounding wire of the system shall be copper core insulated conductor or cable metal pipe. The working grounding wire and protective grounding wire must be separated. The protective grounding conductor shall not use metal hose

7. Before the commissioning of automatic fire alarm system, the detector, regional alarm controller, centralized alarm controller, fire alarm device and fire control equipment shall be powered on one by one, and the system commissioning can be carried out only after they are normal. After the automatic fire alarm system is powered on, all control functions and linkage functions of the alarm controller shall be checked according to the requirements of the current national standards. After the automatic fire alarm system continues to operate for 120h without fault, fill in the commissioning report

(III) key points for construction of air supply and smoke exhaust system of high-rise buildings

1 Fire dampers shall be hoisted separately. The air duct from firewall to fire damper shall be 1 thick. Made of steel plate more than 5mm

2. The installation of air supply and exhaust outlets shall be equipped with =2 outside the outlets. 0mm steel flange short pipe, and fix the flange on the air pipe, then fix the air supply outlet frame on the short pipe, and finally connect the louver air outlet with the fire damper

3. The material and fabrication requirements of ventilation and smoke exhaust duct,

if there is no requirement for the thickness of air duct plate of smoke exhaust system, it can be selected according to the thickness of air duct plate of high-pressure system. For non-metallic composite air duct plate, but only from the current market point of view, the covering material must be other materials. The internal insulation material of air duct with thermal insulation performance shall not be lower than fire-retardant grade B1. The connectors used for the fabrication of air ducts are made of incombustible or flame retardant grade B1 materials

the fire resistance of the air duct of the smoke control system shall comply with the design regulations. The body, frame, connecting and fixing materials and sealing gaskets of the air duct, valve components, thermal insulation materials, flexible short pipes and mufflers must be made of non combustible materials

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