If it is frozen, it must be properly handled.
After welding, the welded junction shall be insulated and cooled slowly.
1.1.5 equipment platforms, ladders and their accessories shall be prefabricated in sections in the Prefabrication Yard according to the construction drawings.
When the foam is repaired at 1.2.5, it must be heated by the burner or flame heater.
1.2.2 during construction, both ends of prefabricated pipe section, equipment, pipe vent and other open parts shall be sealed in time to prevent water, snow and freezing.
1.2.8 impact force shall not be used when high-strength bolts are tightened under negative temperature.
(2) the installation and operation temperature of DC panel and cabinet shall be above 0 ℃.
The windproof and thermal insulation sheds are uniformly fabricated on the ground and can be used after simple assembly before installation and welding.
1.
2.3 winter construction measures for the installation of storage battery and DC panel and cabinet: ⑴ the installation and operation temperature of storage battery must ensure that the indoor temperature is above 5 ℃, and it is best to adopt formal heating indoors; If the formal heating cannot be put into operation due to conditions, the electric heater shall be used for heating, and the stove shall not be used for heating.
When the ambient temperature drops below – 20 ℃, they must patrol once every morning and evening and make records..
If temporary doors are installed, cotton curtain shall be added, and relevant construction personnel shall close the door when entering and leaving.
2.1.3 accessories shall be cleaned before installation, and corresponding preheating measures must be taken for parts to be preheated, and corresponding thermal insulation measures shall be taken for key parts.
1.1.6 the steel structure shall be assembled into pieces in the Prefabrication Yard.
The welded junction shall be wrapped with asbestos or rock wool immediately.
1.2.7 after the disassembly of the pump, the parts shall be reinstalled in time.
1.3 during hoisting operation, carefully check and confirm the ground conditions of the crane station.
1.1.7 when the ambient temperature is lower than 5 ℃, heat and dry within 100mmm on both sides of the weld groove with oxygen acetylene flame before welding to drive away the dew and moisture in the groove.
After effective reinforcement measures are taken, all assembly welds shall be welded to reduce the amount of outdoor welding.
(4) there must be patrol inspectors in the battery and DC room every day and make records.
1.2.4 when water medium is used for pressure test, leakage test or settlement, the ambient temperature must be greater than 5 ℃.
2.
When welding is interrupted, thermal insulation measures shall be taken.
Before hoisting, check whether the lifted object is frozen with the ground.
(4) individual precision equipment and parts shall be placed in the room with heating facilities or covered with cotton quilt.
Installation and construction measures for electrical equipment 2.1 winter construction measures for transformer installation: 2.1.1 outdoor transformer installation and construction is difficult in winter and prone to personnel sliding, so special attention shall be paid to anti-skid during construction.
The middle temperature in the welding process shall not be lower than the preheating temperature.
1.1.8 when the ambient temperature is lower than 0 ℃, steel grades without preheating requirements, except austenitic stainless steel, shall be preheated to more than 15 ℃ within 100mm of the initial welding position.
2.1.2 before construction, check whether the scaffold is firm, remove sundries and snow on the scaffold, and equip safety protection articles.
1.2 equipment and pipeline installation 1.2.1 thoroughly remove the water or dirt in various foundation reserved holes on site, and temporarily fill them with dry sand.
(2) corresponding safety protection facilities shall be equipped for high-altitude operation, and the construction site shall be inspected before construction to remove sundries and snow.
Avoid fire and burn down the equipment.
2.1.5 when hoisting the main and auxiliary equipment, attention must be paid to anti-skid, the lifting hook shall be cleaned immediately, and the snow and sundries on the objects shall be strictly prevented from hurting people.
If they cannot be reinstalled, a cushion shall be set under the parts and covered with thermal insulation materials to prevent fog and snow erosion.
The flame adopts neutral flame.
1.1.3 in order to better prevent wind and improve ambient temperature, an electric heater is installed in the insulation shed, and a thermometer is installed near the welding area for temperature monitoring.
When in use, it shall be put into an electrode insulation barrel with insulation temperature of 80-110 ℃, connected to the power supply, powered on for constant temperature, and taken at any time.
2.2 winter construction measures for panel and cabinet installation: ⑴ attention must be paid to anti-skid and anti freezing for outdoor installation equipment.
When re welding, the welded junction shall be preheated.
2.1.4 pay attention to antifreeze during oil filtering, set up protective shed, send someone to monitor for 24 hours, use electric heater for heating, and fire is strictly prohibited.
After the pieces are in place, the connecting beam shall be spot welded temporarily, and then the canvas shall be used for enclosure around the steel structure to prevent wind, rain and snow.
1.1.4 the insulation shed shall be erected in a fully closed form, especially the bottom shall be filled with insulation materials without leaving gaps.
After the test, drain the accumulated water and blow it dry with compressed air to prevent freezing.
It is strictly prohibited to lift the crane leg on the frozen soil layer.
Preheating, welding and heat treatment shall be carried out on the basis of increasing the ambient temperature.
Installation works 1.1 welding works 1.1.1 the welding rod used for welding must be baked for 1-2h, and then stored in an oven at 80-100 ℃.
Forced pulling and hard hoisting are strictly prohibited to avoid damage to equipment and machines and tools.
(3) formal doors shall be installed in the storage battery and DC room.
1.1.9 welding shall be carried out continuously.
If it is outside for more than 4h, it shall also be baked again.
1.1.2 during pipeline welding, in order to reduce the temperature gradient, prevent cracks, keep the pipeline in a stable state all the time, and the weld area meets the standard mechanical properties, the construction ambient temperature must be increased to more than 0 ℃.
(3) take thermal insulation measures for control equipment and cover with protective articles.
1.2.6 during the secondary grouting of equipment, when the temperature is lower than 5 ℃, the secondary grouting layer shall be cured and thermal insulation and antifreeze measures shall be taken.
After enclosure, the joint welds of the steel structure shall be welded.
Hydrostatic test shall be avoided in winter.
There shall be anti-skid measures between the rigging used for binding and the lifted object, such as wooden board or rubber plate, and it is strictly prohibited to slip off.
1.2.3 during pressure test and leakage test of vessels and pipeline works in winter, the medium that is not easy to freeze shall be used for inspection with soapy water or chlorinated liquid.
The baking times of welding rod shall not exceed twice.
The panel top is covered with waterproof cloth to prevent water leakage and steam leakage of the panel and cabinet caused by freezing crack of the heating pipeline or crack of the welded junction.
