How to add points to the construction quality of the Chengdu steel structure workshop project?

Due to the advantages of high strength, low erection cost and fast construction speed of Chengdu steel structure workshop, it has been widely used in the construction of plant projects in various places. However, due to the rapid development of the industry, some steel structure construction enterprises in China currently have obvious lack of qualifications, uneven construction levels, and lack of quality control levels.

First, problem analysis

The reason for such problems is that due to the low entry threshold of the steel structure industry and the relatively transparent market, some enterprises adopt unfair competition methods in order to achieve higher economic benefits, and even cut corners, thereby reducing the construction quality of the overall project; On the other hand, some enterprises do not pay enough attention to the allocation of professionals, and the professional level of employees is not strong, so as to achieve effective quality control and supervision. So how does the construction quality of steel structure workshop engineering add points to quality management?

2. Pre-construction preparations

Do a good job in engineering design and planning

Due to the many links in the construction process of steel structure workshop, the construction is difficult, and the basic level requirements of regional quality control in different regions are different, resulting in increased difficulty in later construction. Therefore, in order to improve the quality control level of the entire construction link, we must first do a good job in engineering design and planning, do a good job of field investigation before design, consider that the planning content of many aspects needs to communicate with the construction party, and then carry out engineering design and planning according to the opinions of both parties, the content of the plan not only includes the quality control of the construction process, but also includes the detailed content of cost control and progress control.

2. Strengthen the review of construction drawings

The review of construction drawings is an important guarantee for the practical application of planning and design. At present, in the process of building steel structure workshops in China, some small enterprises do not have the corresponding review qualifications, and can only carry out construction according to the design drawings, and do not report in time when there is a problem that does not match the specific conditions of the design and construction in the construction process, resulting in frequent serious quality problems. In order to solve this problem, enterprises should establish a special quality control department to do a good job in the review of construction drawings. If the enterprise does not have the review qualification and technical level, it can entrust a third party to conduct a design review to do a good job in the connection between the construction process and the design, so as to avoid subsequent troubles.

3. Focus on material procurement

Material procurement is the key link of the entire construction quality control. Chengdu steel structure workshop construction process requires a large amount of steel, for steel quality control can not be limited to the factory certificate, but also to the element content of steel materials, including phosphorus and sulfur elements, this is because the existence of these two elements will reduce the overall mechanical strength of the material, not conducive to the effectiveness of subsequent quality control.

3. Construction process progress control

1. Prepare the overall project schedule

The main goal of the progress control work of the construction process is to achieve the planning of the overall project schedule. In the corresponding construction process arrangement, the construction capacity and quality control level of the enterprise, the price cost of the general contractor and the phased construction technology needs of the owner should be fully considered, and the construction schedule should be formulated after comprehensive consideration in combination with the processing, coordination capacity and capital needs of the steel structure manufacturer.

2. Adjust the plan according to the construction process

In the construction process, due to the construction of

steel structure workshop links more, involving a wide range of projects, it is inevitable that there will be special construction conditions affecting the construction progress control and quality control, in the face of these emergencies, should be organized and managed by the site management personnel, and ask the decision-making department to report, and then the construction personnel and the progress control personnel discuss the solution after the plan is adjusted, in the completion of the progress control while ensuring the overall level of quality control.

Fourth, quality control is difficult

1. Civil quality control of foundation works

In the construction of basic engineering, civil engineering has always been one of the main factors affecting the overall level of quality control of steel structures. Mainly because in the process of plant construction, the steel structure is basically prefabricated in advance, and the two decisive factors that really affect the quality control on site are the basic civil engineering and the installation of the steel structure. The civil foundation engineering is not only the key to achieving quality control of the entire project, but also an important link to achieve the stability of plant construction and the efficiency of later construction. Before the foundation pouring, the on-site construction person should first effectively manage the supervision content, realize the analysis of the embedded position of anchor bolts and the comprehensive inspection of temporary fixing measures, and select the construction plan for pouring only after determining that there is no error. In the process of pouring, we should always pay attention to whether there will be a problem of anchor bolt displacement, once the displacement must be adjusted in time, otherwise it can no longer be fixed after the pouring is completed, thus affecting the stability of the overall steel structure frame.

2. Quality control of welding links

The quality control of the welding link is an important link to realize the external strength of the steel structure workshop in Chengdu, which not only affects the service life of the workshop, but also controls the error relationship between the actual design strength of the plant and the construction strength. Its control points are divided into the following two aspects.

(1) Welding process control. Before the welding begins, the weldment should be fully inspected, including whether the groove has been effectively cleaned, whether the welding material is pretreated and baked in accordance with the technical standards, and continue to pay attention to the operating status of the equipment and monitor the defects of the weld and welding process during the welding process, and correct it immediately once the defect occurs. In addition, because the welding point often has different degrees of temperature difference in the welding process, and the temperature difference may cause the weldment deformation, thereby affecting the stress design distribution and the strength design standard of the actual welding, the choice of welding rod must be cautious.

(2) The welding sequence of the on-site weld. The sequence selection of welding is particularly important for on-site weld quality control. In general, welding I-beams first and then flange plates greatly improves welding quality and enables external control of structural safety. In addition, when welding the beam, try to weld one end first, and then weld the other end after the temperature control is uniform, which can ensure that the quality after welding will not be affected by the temperature and cause quality defects.

3. Quality control of the main installation link

In the main installation link of the steel structure,

because the steel structure workshop needs to install more structures, the nature, size and weight difference are very obvious, in the installation process should be according to different structural characteristics to choose the appropriate installation method, most of the mechanical lifting method for structural installation. In the lifting construction of steel columns, it is necessary to hoist according to the installation progress requirements of steel columns, and at the same time cooperate with the installation of crane beams and roof trusses to achieve the accuracy of the lifting axis. When hoisting steel beams, it is necessary to fully consider the size of the ground prefabricated assembly and measure the size of the assembled steel beam, and the lifting can be started after determining the size. During the lifting process, it is not only necessary to control the stability, balance and lateral bending of the steel beam, but also to do a good job in cleaning and accepting the friction surface, and can only be accepted after the content inspection is qualified.

4. Quality control of component connection and fixed links

(1) Connection method of ordinary bolts. For this most commonly used connection method, do a good job of quality control inspection of the early bolts, and only after the inspection can be connected, and the connection should be done carefully and carefully. After completing the installation, it is necessary to review in time to ensure that the bolt head and nut are not loose, that is, the construction acceptance is completed.

(2) Connection of high-strength bolts. High-strength bolts are mainly used for some structural parts that require high-strength protection, and these structural parts must do a good job in the processing quality control of the friction surface when fixing, and at the same time the anti-slip coefficient test of the friction surface, and then carry out the axial force test on the basis of the completion of the test. Since there are often many uncertainties in the assembly of high-strength bolts, the installation process should be completed at one time, and if there is an accident, it should be completed within 1 day to ensure the strength level of high-strength bolts.