What is the temperature of construction projects that must be stopped in the north?

When the temperature is lower than 5℃ for several days, most of the main body construction concrete and plastering masonry cannot be carried out, and only a small amount of decoration and installation can be carried out. In hot weather, the construction unit should arrange the working hours reasonably to reduce the labor intensity. If the daily maximum temperature reaches 35℃ to 37℃, measures shall be taken to shorten the continuous operation time, and outdoor overtime shall not be arranged.

The main reason is that when the temperature is lower than 5℃, the hydration heat will hardly be generated during the cement hydration reaction, which will seriously damage the concrete setting, and the strength of concrete will be seriously and significantly affected, with almost no strength.

For example, according to the regulations of some regions in Qingdao, when the temperature reaches above 35℃, 1 1 to 15 shall not be used for construction in direct sunlight. When the temperature is higher than 36℃, the open-air construction shall be stopped immediately. If the highest temperature of the day reaches above 40℃, the work should be stopped.

Extended data:

Generally, the northern construction site will be shut down on June 5438+065438+1October1May. Because winter construction will increase a lot of costs, it is generally chosen to stop work, and the specific time should be determined according to the weather and soil frozen layer.

The length of the construction period is very important to the benefit of the construction project. In the process of construction, due to the influence of natural climate and project progress, it is inevitable to carry out winter construction. According to the Code for Winter Construction of Building Engineering (JGJ 104-97), when the daily average outdoor temperature is stable below 5℃ for five consecutive days, winter construction will begin.

If the measures are improper, it will bring adverse effects to the construction project, and it is easy to cause hidden dangers or quality accidents to the project quality, so the housing construction project should be constructed at a temperature higher than 5℃ as much as possible.

Because its strength growth mainly depends on hydration, when water freezes, hydration stops, and when water freezes, its volume will expand, making the concrete structure loose and damaged. Therefore, when the average temperature of day and night is lower than -5℃, the construction should be stopped. When the average day and night temperature is between 5℃ and -5℃, protective measures should be taken before construction.

Baidu Encyclopedia-Code for Winter Construction of Building Engineering