According to the project schedule, the main project construction is in summer and winter rainy season. In order to ensure the engineering quality and construction progress requirements, the following measures are formulated:
(A) summer construction measures
1. Carry out physical examination for personnel working at high temperature and high altitude, and set up a rest shed.
2, before pouring concrete, templates, construction joints should be washed with water. After concrete pouring, cover it with bales in time, and assign special personnel to water and maintain it, so as to keep the covered bales moist.
3, bricklaying, measures should be taken to make the bricks wet, mortar consistency is bigger.
4. During construction in summer, windproof measures should be taken, and mechanical equipment and frames should be strengthened. In case of strong wind, tower crane and construction elevator should stop working.
5, summer construction at the same time should strengthen lightning protection measures, in order to protect buildings, lifting equipment from lightning, lightning protection and reliable grounding.
(2) Construction measures in rainy season
1, the rainy season construction should keep the site drainage unblocked and the drainage facilities perfect, and eliminate the site water in time.
2. Prepare rain-proof equipment and tools.
3. When pouring concrete, the water cement ratio should be appropriately reduced. In case of heavy rain, the newly poured concrete should be covered with plastic sheets and straw bags for maintenance.
4, bricklaying, mortar consistency should be reduced.
(3) Winter construction measures
1, concrete structure engineering
Before freezing, the compressive strength of concrete shall not be lower than the following provisions:
The concrete prepared with (1) ordinary cement is 30% of the design concrete strength standard value.
(2) Concrete mixed with admixture. The critical strength before freezing should be greater than or equal to 4.0Mpa. According to relevant data, if the concrete poured in winter is frozen immediately, its final strength loss can reach 40-50%, which should be paid special attention to. In order to slow down the cooling rate of concrete or shorten the setting time of concrete, and ensure that the concrete reaches the minimum strength before freezing, the following measures are taken for concrete construction in winter of this project:
1) Thermal storage and insulation of concrete: After concrete is poured on the floor, cover it with colored strips and straw bags for curing 1-2 days in time, and use the hydration heat of cement to promote the hardening of concrete at room temperature to achieve the expected strength.
2) Adding triethanolamine, sodium sulfate and calcium lignosulfonate compound early-strength antifreeze into concrete to accelerate the hardening of concrete, reduce the freezing temperature of concrete, and increase the strength of concrete without freezing at negative temperature.
3) Mixing adopts ordinary cement with early strength, good frost resistance and high hydration heat.
4) The sand and gravel used to prepare concrete shall not contain frozen blocks of snow and ice, and the mixing time of concrete shall be increased by 50% compared with normal temperature.
2, masonry engineering
(1) Frost should be removed from the bricks used.
(2) The mortar is mixed with 425 # ordinary portland cement.
(3) The bag ash should be prevented from freezing and caking.
(4) Sand should not contain ice cubes and ice cubes with a diameter greater than 1cm.
(5) When the temperature is high at noon, water the bricks to wash away the dust and wet them, and transport them to the job site in time to avoid freezing.
(6) When laying, mortar should be used as you build by laying bricks or stones to prevent freezing.
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