1) Winter Metal Culverts Pipe construction measures:

① The ambient temperature during welding should not be lower than -20, and measures such as snow and wind protection should be taken to reduce the temperature difference of the weldment. The welded joints are strictly forbidden to come into contact with ice and snow immediately.

② When mixing concrete in winter, the mix ratio and slump of the concrete should be strictly controlled, and the aggregate must not contain ice, snow and frozen mass. Before feeding, use hot water or steam to rinse the mixing plate or drum of the mixer. The order of addition should be aggregate, water, and a little mixing before adding cement, and the mixing time should be 50% longer than normal temperature.

③ The concrete pouring should be done on a sunny day and ensure that it is completed before cooling down. At the same time, it should be insulated and maintained, and the concrete should not be frozen until the concrete strength reaches the design requirements.

④ The exit temperature of concrete should not be lower than 10, and the transportation equipment should have heat preservation measures, and the transportation time should be shortened to the greatest extent, and the entering temperature should not be lower than 5.

⑤ Concrete transportation vehicles must have thermal insulation measures to shorten the transportation time of concrete as much as possible.

2) Construction measures of Metal Culverts Pipe in rainy season:

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① The construction should be arranged in advance during the rainy season and try to be completed before the rain arrives. There are waterproof facilities around the foundation pit to prevent the surrounding water from flowing into the foundation pit.

② Increase the frequency of sand and stone water content testing, and adjust the concrete mix in time to ensure the quality of concrete mixing.

③ Strengthen coverage of metal corrugated culverts to prevent corrosion. When connecting Metal Culverts Pipe, temporary rain sheds should be set up to prevent rain erosion.

④ Special attention should be paid to the protection of power supply lines. The switch box of the on-site electromechanical equipment should be covered and moisture-proof, and the wires should be well insulated to prevent leakage and electric shock accidents.

3) Construction measures of Metal Culverts Pipe in hot weather:

① During concrete construction in hot period, cooling measures should be taken for the mixing water to control the pouring temperature of the concrete below 30, and the influence of high temperature on the loss of concrete slump should be considered. The concrete must not be mixed with water during transportation.

② If conditions are available, sun protection should be covered to reduce the temperature of the formwork and steel bars; water can also be sprayed on the formwork and steel bars to cool down, but there should be no accumulated water or attached water in the formwork when concrete is poured.

③ The concrete truck should have a mixing device, and the tank should have sun protection measures. The concrete should be mixed slowly and uninterruptedly during transportation, and the transportation time should be minimized.

④ The formwork should be removed when the internal temperature is low, and the concrete surface should be kept moisturized for no less than 7 days after the formwork is removed.