Concrete construction technology disclosure, concrete engineering construction safety technical disc

1) Before the base layer requires that before the concrete mixture is paved, the smoothness and wetting of the base layer, the position of the steel bar and the force transmission rod device should be comprehensively inspected. The poor flatness of the base layer is easy to cause the inconsistency of the pavement thickness, and a weak section is formed at the junction of too thin or thick and thin, and when the concrete shrinks, it is easy to crack apart. In addition, the base layer should be kept moist, but there is no water accumulation, so as to prevent the absorption of concrete water and the cracks caused by plastic water loss in the concrete.

2) When erecting the mold, it is necessary to check whether the height of the template and the width between the templates meet the requirements, and make the template close to the surface of the base layer, and firmly, withstand the vibration of the vibrating beam without distortion. If there is a gap between the formwork and the base layer, the gap should be filled to prevent slurry leakage during vibrating. In order to facilitate the removal of the formwork, the inside of the template is coated with a separator or a layer of agricultural plastic film, which can prevent water leakage and slurry leakage, and ensure the strength and compactness of the concrete slab edge and corner.

3) During the pouring process of paving concrete, the distribution should be dispersed to ensure that the concrete mixture is evenly distributed and there is no accumulation. When paving, iron palladium should be used to disperse and pave the concrete palladium. When using dump trucks or mixer trucks to unload, it is strictly forbidden to concentrate a few points of cloth, so that the concrete is piled up, and the construction personnel are easy to cause homogeneous damage to the concrete mixture in the leveling process.

When the thickness of the concrete slab is greater than 220mm, it can be paved twice, and the lower thickness should be 2 3 of the total thicknessWhen the plate thickness is less than 220mm, it can be paved at one time. The loose concrete when paving should be slightly higher than about 5 of the design height of the top surface of the formwork. (4) After vibrating the concrete pouring, use the vibrating rod to "plug in and pull out slowly" at an angle of 30 ° and 45 °, fully vibrate, and vibrate evenly in the shape of "product", so as not to leak vibration, but not to vibrate.

The moving distance of each rod of the vibrating rod is not greater than the times of its radius of action or according to the control of 30cm, and the distance between it and the template is less than the times of the radius of the vibrating action. When vibrating, there is a slurry on the surface of the concrete mixture, and the mixture is filled with the formwork, which no longer sinks significantly, and there are no more bubbles on the concrete surface that overflow obviously. After the concrete is fully vibrated with a vibrating rod, the vibrating beam should be used to follow it and walk back 2 or 3 times to achieve a smooth and uniform surface, without exposing stones, and the surface is smooth and uniform.

Vibrating should be supplemented by manual leveling, and the formwork should be checked at any time. If there is sinking, deformation or loosening, it should be corrected in time. After the vibrating beam is leveled, use a 600mm 700mm long trowel (wood or plastic) to use the kneading method to squeeze and compact the surface of the concrete slab, and press out the cement slurry until the board surface is flat and the mortar is uniform, generally about 3 5 times.

5) Before the initial setting of the concrete, when there is no water leakage on the surface, rub the surface with a grinding disc to further lift and compact the surface, eliminate the water leakage channel generated in the process of concrete water leakage, eliminate micro cracks, and control the crack propagation. The wiping process should be timely and in place, and the purpose of effectively eliminating surface cracks should be achieved. In summer high temperature and windy weather, the evaporation rate is relatively fast, and moisturizing measures should be taken in time to prevent the surface from evaporating too quickly, resulting in a hard shell, and the inside is too soft to form a spring pavement.

in the final setting of concrete.

<> What is the specific content of the technical disclosure of concrete engineering construction safety, the following Zhongda Consulting will answer for you.

1.When entering the site, you must abide by the six disciplines of safety production.

2.The lane board bicycle walking is not less than the width, the double car back and forth is not less than the width, when transporting materials, a certain distance between the front and rear vehicles should be maintained, and no running, gun path or overtaking is allowed. When unloading at the end of the line, both hands should be firmly on the handle to dump the material, and it is strictly forbidden to take off the handle with both hands to prevent overturning and hurting people.

3.When the tower crane puts down the hopper, the operator should take the initiative to avoid, and should pay attention to the hopper at any time, and should stand firm to prevent the hopper from falling down.

4.More than 2m from the ground poured over the peib beam, awning, small platform, etc., is not allowed to stand on the head of the operation, such as no reliable safety facilities, must wear a safety belt, and buckle the safety hook.

5.Before using the vibrating machine, the power supply voltage should be checked, and the power cord must not have a joint, whether the mechanical operation is normal, when the vibrating machine moves, the wire can not be hard-pulled, and it cannot be dragged on the steel bar and other sharp objects, so as to prevent the electric shock accident caused by cutting and pulling off the wire.

6.When the derrick basket is lifted or put down, the derrick safety door must be closed, and the head and hands are not allowed to reach into the derrick, and the gondola can only enter the gondola to work when the gondola is stable.

1. In addition to comprehending the design intent, it is necessary to meet the requirements of design drawings and changes, and implement and meet the reasonable requirements of construction specifications, procedures, process standards, quality assessment standards and construction units.

2. The entire construction process, including the construction of each sub-project, must be made a technical disclosure, and the technical disclosure should be made seriously for some special key parts and concealed projects with great technical difficulty.

3. For the types of work and engineering parts that are prone to quality accidents and industrial accidents, the preventive measures for various accidents should be emphasized in the technical disclosure.

4. The technical disclosure must be in writing, and the handwriting of the disclosure content should be clear and complete, and the person who made the disclosure and the recipient must sign it.

5. The technical disclosure must be carried out before the construction of the project, as part of the preparation for the construction of the whole project and the sub-project.