(1) in the whole construction process of the project, due to the complex functions involved in the project, the construction party should carefully consult the construction drawings, and the construction technical director of each specialty should understand the construction drawing design description and system drawing certification according to the actual situation of the project, grasp the overall direction, and the design unit should carry out technical disclosure and comprehensive evaluation to the construction unit before the construction Drawing analysis, including the pipeline layout direction, equipment location, model specifications, construction key points and difficulties for a comprehensive description and disclosure
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(2) The quality of equipment and materials will directly affect the quality of fire installation engineering
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Therefore, electrical equipment and materials must be purchased in accordance with strict quality standards, and do a good job in the field test report, sampling inspection to ensure product quality
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2
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Building electrical setting and construction (1) setting of two speed smoke exhaust fan
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Most of the underground garages in commercial and residential buildings use two speed fans for air supply and smoke exhaust
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The principle of ordinary two speed fan is to turn on low-speed exhaust at ordinary times and switch to high-speed exhaust when fire occurs
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When the flue gas temperature in the exhaust duct is more than 2800 ℃, the fire damper will close and the linkage exhaust fan will stop
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According to this principle, the author and the designer study and adopt the control principle of two speed fan
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The control is divided into field control box control and multi line control of fire control center
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There are manual and automatic selection switches on the control box
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When someone is on duty on site, the manual switch can be turned on
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At this time, the buttons of the control box can start and stop the high and low speed exhaust gears on site
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When the low speed is running, if there is a confirmed fire signal in the fire control center, the low speed gear can automatically jump to the high speed exhaust operation through multi line control
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When no one is on duty on site, the automatic switch can be turned on the control box, and the manual switch can be turned on the field control box If the button fails, the fire control center can control the start and stop of high speed gear through multiple lines
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(2) Removal of non fire power
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The community not only considers the removal of some non fire power sources that will help the fire, such as the commonly used forced draft fan, induction fan and other equipment, but also considers the removal of some non fire power sources that endanger the implementation of fire-fighting actions by firefighters, such as underground garage lighting, etc., the latter is often ignored by relevant personnel
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(3) Early test of fire switch signal output
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In the fire protection system, the signal feedback of water flow indicator, signal butterfly, positive pressure air supply outlet, fire damper and other devices are realized through the fire switch signal output
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During the construction of the group, these switches should be tested and inspected separately in advance, and the faults should be eliminated in time, which is of great help to the fire debugging, detection and acceptance
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In the construction, two sets of small DC circuits are used to solve this problem, one is used to simulate the fire linkage signal, and the other is used to simulate the fire feedback signal
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According to the linkage or feedback DC action voltage specified in the fire protection products, the battery pack and the bulb and switch of corresponding voltage level shall be equipped, and a pair of movable clip contacts shall be made in the series circuit
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Strengthen the quality control of technology in the comprehensive commissioning stage
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After the completion of the fire engineering construction, the comprehensive commissioning of each system should be organized in time to ensure that the construction quality meets the requirements of the design scheme and ensure the fire safety
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The following work should be done well: before the installation of all nozzles in the system, the overall water pressure strength and tightness test of the whole water supply system pipe network should be carried out according to the design pressure requirements The water stop valve and alarm valve should be removed to protect the instrument
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The flushing speed shall not be less than 3m / s during flushing
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4
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Comprehensive commissioning stage construction technology after the completion of fire engineering construction, the comprehensive commissioning of each system should be organized in time to ensure that the construction quality meets the requirements of the design scheme and fire safety
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The following work should be done well: before the installation of all nozzles in the system is completed, the water pressure strength and tightness test of the whole water supply system pipe network should be carried out according to the design pressure requirements The water stop valve and alarm valve shall be disassembled to protect the instrument
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In the process of flushing, the flushing speed shall not be less than 3m / S; the function test of automatic fire alarm system and its linkage system mainly includes fault alarm, fire priority and its memory function, feedback signal test, etc
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At the same time, the insulation resistance and grounding test shall be conducted for the electrical system, the test run and power on inspection shall be conducted for the electrical equipment and lighting equipment, the insulation resistance shake test shall be conducted for the main power supply cable and bus, and the joint grounding resistance of the system shall not be greater than 1q
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