by Hangzhou urban and Rural Development Commission: in order to strengthen the industry self-discipline of precast concrete component production enterprises, promote the stable improvement of the quality of precast concrete components, and ensure the quality of prefabricated construction projects, According to the spirit of the notice on carrying out the registration and self-discipline management of precast concrete component production enterprises (hang Jian Xie [2020] No.
18) and other documents, the Municipal Construction Association has carried out the special quality inspection of precast concrete component enterprises in Hangzhou.
The relevant information is reported as follows: I.
Basic information.
This inspection was conducted in two batches from December 1 to 10, 2020 and April 12 to 21, 2021.
The inspection team was composed of experts from the municipal industrialization office, the municipal general station of quality and safety supervision, the Municipal Construction Association, component enterprises and other relevant units to inspect 30 PC component manufacturing enterprises in (into) Hangzhou.
Experts check and score according to the star rating rating table of Hangzhou precast concrete component manufacturers.
Focus on the following contents: 1 Check the management information of enterprise filing and registration and the basic situation of enterprise production base; 2.
Production process quality control and technical data management; 3.
Management of laboratory personnel, equipment, environment and test data; 4.
On site sampling inspection on the quality of prefabricated component products and raw materials.
2、 Inspection condition 1 Enterprise management system and staffing: the management system of large and medium-sized enterprises or production base enterprises is relatively standardized and the staffing is complete.
However, some small enterprises are relatively deficient, especially the allocation of technical directors and quality personnel with medium and senior professional titles.
The technical disclosure and personnel training before production are not implemented or not standardized.
2.
Laboratory: there is a large gap in the internal management of each enterprise laboratory.
The operating rooms and equipment of some enterprises are not perfect, there are insufficient testers or lack of testers’ work certificates, and the internal quality control of raw materials and test blocks is not in place, especially the chloride ion detection is not paid enough attention.
3.
Component quality: each component enterprise pays different attention, and the component quality gap is obvious.
The size deviation of components in some enterprises is large, the length of exposed reinforcement is different, and the deviation of embedded box sleeve is serious; The demoulding strength of some components is insufficient, and the components are seriously damaged; The appearance quality of the laminated board is poor, with honeycomb holes, uneven surface, warpage, cracks, etc; The appearance quality of special-shaped components is poor, and the phenomena such as damage, more pores and cracking at internal corners exist in varying degrees.
The components of some enterprises are stacked irregularly, the skids stacked by laminated plates are not placed on the same vertical line, and the vertical components are placed horizontally without protective measures.
4.
Data: the raw material re inspection report and process inspection data provided by some enterprises are not standardized, and the acceptance records of concealed works and technical disclosure data are incomplete.
At the same time, due to the inconsistency of the data required by each regional quality supervision department for the mobilized components, the data versions of each component enterprise are more and more chaotic, which brings some difficulties to the data traceability management.
5.
Most of the enterprises in Hangzhou have not yet entered the “information management system of component design”, but most of them have not entered the information management system of component design and assembly.
According to the enterprise score, comprehensive enterprise scale and production capacity, 5 class A enterprises, 22 class B enterprises and 3 class C enterprises are evaluated.
See the attachment for the inspection results.
3、 In order to better standardize the precast concrete component industry and improve the overall quality of components, we put forward some suggestions for reference according to the problems found in the inspection.
1.
At present, the precast concrete component industry is managed by the association through industry self-discipline, which has certain difficulties in quality supervision.
It is suggested that the competent construction department and market supervision and other relevant departments should conduct linkage management to further standardize the whole component industry and improve the quality level of the industry.
2.
Standardize the quality management of enterprises, especially the allocation of technical personnel, establish and improve the laboratory, and improve the internal control quality of enterprises.
It is suggested that the competent department should determine the relevant specifications that the component enterprises should implement, such as managing the overall specifications of the component enterprises according to the JG / t565-2018 standard for quality management of factory precast concrete components, and putting forward specific requirements and measures in terms of personnel, equipment, laboratory and quality control.
3.
Standardize the internal laboratory of precast concrete components enterprises.
Uniform provisions shall be made for the training of laboratory, operation room, equipment and personnel, so as to make the precast concrete component enterprises pay more attention to the internal control quality of products and make the component quality of the industry controllable.
4.
Standardize the format of component data.
Form a unified data version in Zhejiang Province to reduce the burden on enterprises.
5.
For government projects or excellent projects, it is suggested to use the component products supplied by excellent component enterprises (such as those rated as class A and B in this special quality inspection), which can improve the enthusiasm of component enterprises for their own quality improvement, relatively curb the rapid expansion of small workshop enterprises, and is conducive to the healthy development of the whole industry..
