In the past, single-layer formwork was often used to support concrete construction, and the technology was mature and the stress was relatively simple. Nowadays, multi-layer formwork support is often used, and the stress situation becomes complicated. It is difficult to accurately control the stress in the process of design and construction, and it is difficult to carry out formwork support construction simply by relying on construction experience. The design scheme of concrete formwork should be worked out through accurate calculation. Improper operation will affect the overall safety and stability of the formwork support system. In addition, at present, the employment system of on-site construction personnel is not perfect, and many construction personnel are temporarily employed, with poor professional skills. In addition, the technicians did not do the disclosure work correctly, which caused many problems in the construction. Collapse accidents of formwork supports occur from time to time, because the staff did not arrange the support spacing reasonably, resulting in insufficient stability of formwork supports. Sometimes it is because the mounting structure design of the bracket is unreasonable, or it is not operated according to the specified requirements. For example, vertical and horizontal supports are not installed, or the ground flatness at the position where the supports are located is not enough. Dismantling the supporting structure without authorization by the staff will also lead to the instability of the support and the collapse of the support.

2 Construction technology of concrete formwork for building engineering

Formwork construction is an important guarantee for the overall structural quality of assembled building engineering. As one of the projects with the longest construction period and the highest input cost, formwork construction should be paid special attention to. We should optimize the construction design scheme from the aspects of quality, cost, construction period and operability. On the premise of meeting the construction quality and safety, optimize the construction technology of concrete formwork, reduce the manpower input of formwork support and demolition, increase the turnover times of formwork and reduce the construction cost of formwork. The basic requirements of concrete formwork construction in building engineering include: ensuring the correctness of the shape, size and installation position of concrete structures and components; The poured concrete formwork should have sufficient rigidity, strength and stability; Jointing between templates is tight, without slurry leakage; Template installation and removal is convenient [2].

2. 1 template installation

(1) column formwork installation: when installing the first column formwork, it is necessary to set up temporary support or tie the column formwork with the main reinforcement of the column with lead wire for temporary fixation; When installing the second column template, the two column templates should be bonded with sponge strips with a thickness of 2 coffees to prevent slurry leakage, and then the two column templates should be connected and fixed with bolts; After that, the subsequent installation of column formwork is completed in turn to form a square barrel shape, and then column hoop is installed from top to bottom to correct the axial displacement, vertical deviation, section and diagonal of column formwork. Fix the column formwork with three small steel beams, and the spacing between every two beams is 50 cm. Then, the axial displacement, vertical deviation, section and diagonal of the column formwork are corrected again [3]. (2) Installation of beam formwork: In the current building construction code of our country, the height of the supporting formwork for the floor slab of the main structure of the building should be 3.2—2.4m, the thickness of the formwork should be 9- 12cm, the distance between the outermost vertical poles under the beam should be 1.2m, and the distance between horizontal poles should be1.5m. When the height of the beam is more than 30cm, another one should be added at the bottom of the beam. When calculating and designing side formwork, the clear distance of beam should be adopted, and the connection position should be in the middle of beam span.

2.2 form removal

When removing the non-bearing formwork on the side of reinforced concrete structure, reinforced concrete should have sufficient strength. Be careful when ripping and hoisting, don't use too much force to protect the edges and corners. The formwork removal time must be determined according to the test results of the test block to prevent premature formwork removal. Protect the finished product after ripping. Angle steel shall be used to protect the external corner of the concrete corner at the passage where people often pass or construction raw materials are used, so as to prevent collision and damage to the finished product. Strict construction process management can effectively improve the construction quality. Therefore, in the process of construction, it is necessary to clarify the construction sequence, strengthen the awareness of construction safety, strengthen the supervision system, refine the distribution of responsibilities, and ensure the concrete formwork construction to achieve the ideal effect and ensure the smooth development of the whole project.

3 Construction quality control measures of concrete formwork in building engineering

(1) When installing the formwork, the position of the formwork shall be determined in strict accordance with the design scheme, the columns shall be perpendicular to the board surface, and the height difference between columns shall not exceed 2mm. After installation, check the nodes to ensure that they are tightened.

(2) Ensure the quality of materials used in the formwork. The variety, quality and performance of all steel bars used in the project must conform to relevant specifications, and quality certificates must be provided before entering the site. After reinforcement processing, sampling inspection shall be conducted to ensure that the deviation of reinforcement meets the specified standards.

(3) Building materials and construction machinery are the foundation of building construction, which directly affect the quality of building. Therefore, the quality of building materials and construction machinery should be strictly controlled. Once the building materials or construction equipment have problems, it will lead to a series of chain problems, and the cost of remediation is extremely high, which will delay the construction progress and the construction period. Therefore, strict screening should be carried out in the procurement process, and it is strictly forbidden to cut corners and shoddy goods, and the responsibility should be implemented to individuals and strictly investigated.

(4) Pay attention to the introduction of talents and build a high-level talent team. The quality control of construction projects needs the cooperation of many aspects, among which the ability of managers plays a great mediating role. Therefore, under the condition of economic permission, the construction unit should attach importance to the introduction of management talents, build a high-level management team, give full play to the enthusiasm of managers, and promote the improvement of the construction management system. The construction of high-level management team is not once and for all, but also pays attention to the cultivation of professional quality, and regularly holds management skill level training of management team to ensure its professional working attitude and high sense of responsibility, so as to escort the construction quality and safety. In addition, the management department should reasonably allocate the resources of the project quality management control engineers and fully understand their work contents. The construction of concrete formwork in building engineering plays an important role in the whole building construction. The rationality of its construction technology directly affects the construction progress and quality of the whole project, and is also directly related to the safety and stability of the building. Therefore, in the construction process, we should strictly control the construction quality of concrete formwork in building engineering to ensure the high-quality and efficient completion of the whole project.

I believe that after the above introduction, everyone has a certain understanding of the construction technology analysis of concrete formwork in building engineering. Welcome to Zhong Da for more information.

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