Pour concrete - remove Formwork - b

Pour concrete - remove Formwork - brush protective film - measure the lower layer.Formwork is the key to the quality of as cast finish concrete. In order to meet the design requirements and meet the quality standards of as cast finish concrete, the newly purchased standard steel formwork is used to form a large block according to the cross-sectional dimension of the component, and then a 1.5mm thick formwork is placed on the surface to form a large block. PVC formwork, turbine foundation and steel ball grinding foundation are pasted with 12mm thickThe cross-sectional dimensions of and D are 600 × 1200600 × 1400600 × 1800 and 600 × 1600 respectively. Each appearance of a column template is divided into three parts. In order to meet the requirements of as cast finish concrete perception standard, each part is finished large steel formwork. There are only 2 transverse joints and they are placed at the jointsThe splicing joint shall be pasted with adhesive tape.Calculation of side pressure of column mould: using internal vibrator,When the concrete is placed under the maximum side pressure of the formwork, take the smaller value in the formula: PM = 4 1500 / (T 30) × KS × kW × V1 / 3 = 25h in PM - the maximum side pressure of the new concrete (kW /); t - the temperature of the concrete entering the formwork (° C); H - the total height from the calculation position of the concrete side pressure to the top surface of the poured concrete (m); KS - the influence coefficient of the concrete slump, when the slump is 110 ~ 150 mm When it is 1.15, the kW plus agent will affect the correction coefficient [4]. When there is no additive,Calculate the distance between the upper and lower steel hoops according to the deflection (allowable deflection [x] < 2mm) B < 498mm. The spacing of ferrule can be controlled at 490mm. Take 600 × 1800 section as an example to calculate the column hoop section. In order to ensure the accuracy of the section size, it is necessary to have the steel hoop deflection x ≤ 2mm. The section is selected according to the deflection, I = 1.49 × 107.This also controls the verticality of the column [5].(3) reinforcement design of steam turbine column mould: a. According to the concrete side pressure PM = 88kpa during concrete pouring, channel steel is used as column clamp, and the middle part of column is reinforced with 16500 tension bolts along the direction of small surface. The side beam of the running layer beam is strengthened by steel pipe and tension bolt. Vertical steel pipe is arranged at 500mm.In order to plan and coordinate the preparation before pouring, the quality of ready mixed concrete must be strictly controlled to ensure the uniformity of concrete performance. The concrete must be poured continuously, and the construction joint shall be left at the opening to avoid affecting the quality of concrete due to cold joint construction. To master the vibration time of concrete, a uniform cement slurry will appear on the concrete surface, no obvious sinking will occur, and a large number of bubbles will be absorbed; in order to reduce the surface of concrete, it is recommended to adopt the secondary vibration process, after the first pouring in the concrete to the mold, the vibration will be carried out, and the second time will be carried out before the second layer of concrete. The top layer concrete usually vibrates after 0.5 hours.