After the final setting of concrete pouring, arrange personnel to chisel the construction joints immediately, and close the formwork after confirming that the construction joints are cleaned.
Therefore, we have carried out the use test on the selected clean water formwork.
▲ the cut surface of the template used once is in a state with neat edges, which fully meets the use function.
▲ when the formwork has been used for three times, the edge is cracked and deformed and cannot be used again.
Construction engineering specifications carefully push you all kinds of information, specifications, materials, tutorials, software, etc.
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The interval between sections is 40cm.
During formwork reinforcement, 20mm reinforced ground anchor shall be embedded at the bottom to reinforce the bottom of the formwork.
The above two steps can avoid excessive water absorption of formwork and poured concrete, reduce the fluidity of newly poured concrete, prevent concrete from hardening in a short time, ensure the overlapping of new and old concrete, and avoid honeycomb and rotten roots.
Therefore, we formulate the following quality assurance measures.
In order to make the connection between formwork and old concrete tight, after the formwork is closed, the gap between formwork and old concrete shall be plastered tightly with cement mortar to prevent mortar leakage and rotten roots.
The formwork at the joint of formwork and old concrete at the formwork root is not tightly sealed, which is prone to mortar leakage.
Even if the rigidity of the formwork reinforcement system is large, it is difficult to ensure the straightness of the edges and corners.
According to the requirements of technical disclosure, during concrete pouring, the vibration time shall be subject to no foaming on the concrete surface (about 20-30s).
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We analyze that there are many reasons for this construction quality problem, among which the main reasons are inadequate treatment of construction joints, large deformation of formwork root, improper operation of constructors and water absorption deformation of formwork edge.
are very clear, and the pouring responsible person listing system has been implemented on site, and the supervision is in place.
The formwork and construction joints shall be watered and wetted before concrete pouring, and 5-10cm mortar with the same proportion shall be poured as the cushion bottom before concrete pouring.
source: network, construction engineering specifications, etc.
Strengthen the treatment of construction joints.
The surface shall be flat and smooth, and the edges and corners shall be straight without rotten roots; At the same time, secondary renovation is avoided, which won time for the lower process and indirectly contributed to the handover according to the construction period· .
Control the turnover times of the formwork.
Strengthen the treatment of formwork root.
The problems of honeycomb and pitted surface on concrete surface, slurry running and rotten root at edges and corners are the most common construction quality problems in concrete construction.
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The stress at the root of column formwork is large, which is most likely to deform during concrete pouring, resulting in formwork expansion and slurry leakage, resulting in rotten roots.
The vibrating time, action radius, position, rod lifting speed, etc.
Square hoops shall be added around the outer periphery of each column formwork and fastened with split bolts to ensure no formwork expansion at the bottom.
After the implementation of the above concrete construction quality assurance measures, the qualified rate of concrete appearance quality of the project reaches more than 95%.
The edge concrete shall be vibrated first, and then the inner concrete shall be vibrated.
Improve the quality of operators and strengthen the monitoring of construction process.
▲ section status of newly purchased formwork.
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During the construction process, young technicians should be set up to supervise the concrete placement.
if there is any copyright problem, please contact to delete the factors of concrete appearance quality mainly include the following: honeycomb and pitted surface, unsmooth edges and corners, rotten roots, wrong platform, color difference, insufficient strength and surface sanding.
The edge of the formwork is easy to absorb water after cutting, and cracks, distortion and deformation are formed after repeated use.
The vibrator shall be inserted quickly and lifted slowly.
When vibrating, it shall be 20cm away from the joint.
Therefore, we come to the conclusion that in order to ensure the straightness of concrete edges and corners, the turnover times of formwork shall not exceed 3 times.
Due to the lack of experience of construction personnel, we adopt the form of technical disclosure in terms of operation methods, quality quality and technical means to make each operator understand the essentials and ensure correct operation.
▲ in the cutting state of the formwork used twice, there are burrs and falling edges on the edges, which shall be carefully spliced and tight during use.
