How to heat the steel formwork

How is the steel template heated? Hubei Wangke Template Co., Ltd. tells everyone as follows:

After the well pile concrete is poured and pounded, straw bales and plastic film are used to protect and heat the top. Before concrete irrigation, a layer of plastic cloth and a layer of cotton blanket should be used to wrap a layer of plastic cloth and a layer of cotton blanket with hemp rope or iron wire outside the column formwork before concrete irrigation. The insulation layer is required to be tightly packed.

The pouring construction of beam and slab concrete should use the method of insulation first and then forming, and it should be based on the method before pouring beam and slab concrete The flow section is divided into sections for enclosure. The enclosure materials can be colored cloth strips, cotton blankets, and stoves are used as the heat source. The placement of the stove should take into account the actual situation that the surrounding temperature is lower than the center temperature, and place the stove around as much as possible. The temperature of the furnace should not be too high, to prevent direct baking of the template, and steel plate should be added above the furnace to cover it.

and shift the furnace after concrete pouring to avoid heat buildup and form part of the concrete moisture Drain too quickly and then form a crack. After the concrete pouring of the beams and slabs, a layer of plastic film (or another layer of cotton blanket) should be covered in time. The temperature of the part in the shed close to the bottom of the board should be kept above 6°C.

In order to prevent the heat at the bottom of the furnace from affecting the concrete at the base level, the bottom of the furnace should be used as waste when setting up the furnace The steel template is lined. After the concrete is poured and thermally protected for 3 days, the tester selects a rebound tester to test the strength of the concrete. According to the measured position, the measured data are corrected to obtain the strength value of the concrete.

If the critical strength has been exceeded (the project department’s rules must reach 35% of the planned strength, which is 10.5Mpa or more), That is to say, the thermal insulation conditions can be canceled for the pipeline section, and the thermal insulation can be canceled after reporting to the supervision. However, in order to avoid the loss of concrete moisture, it is necessary to continue to cover up the plastic film for one week after the insulation is removed to meet the requirements of concrete protection and ensure its strength development.