Quality accident investigation report

In the era of continuous progress, reporting is no longer a rare thing, reporting has become an emerging industry. So how is a general report written? The following is a quality accident investigation report that I carefully compiled. You are welcome to read it. I hope you will like it.

Quality Accident Investigation Report 1

Company leadership:

Recently, the Ningxia market has reported that XXXX’s gift boxes have wrinkles (see attached picture 1),

After receiving the information, the quality department conducted an investigation into the relevant links and now reports as follows:

1. Product situation

1. The batch number of the product with wrinkled gift box is: XXXXX , a total of XXXXX pieces were produced for this batch number;

2. The gift box supplier is XXX Co., Ltd. (hereinafter referred to as XXXX);

3. This batch of Ningxia customers** *XXXXX pieces were purchased and XXXX products were recovered from the market. Among them, XXX pieces were all blistered and wrinkled, and XX pieces were not sampled;

4. XX products were recovered with the cooperation of the market inspector of XX company ;

5. There is currently no feedback on this quality issue from other markets;

6. This batch of products is out of stock. < /p>

2. According to the market management personnel’s visit to 7 terminal retail stores in Helan County, the products with production batch number XXX have blistering and wrinkles in the gift boxes in 7 retail stores.

3. Product handling

In view of the fact that this batch of products had less blistering and wrinkles in the warehouse, only 3 bottles of the 5 products were found, and the products with blisters and wrinkles were stored on the terminal shelves. The above performance is obvious, so this batch of products is XXXXXXXXXXXXXXXXXXXX.

IV. Cause Analysis

A joint investigation by the Quality Department and XXXX found that the batch of gift boxes were produced in January this year, with low temperature and short time, and the gift boxes were not fully processed. After drying, it is sent to the packaging location. During the subsequent transportation and storage process, especially during the shelf process, as the temperature and humidity increase, some gift box tissue paper dries and shrinks in a high-temperature environment, resulting in the glue on the surface. The membrane is wrinkled.

V. Division of Responsibilities

1. Because the supplier of this batch of gift boxes did not dry the gift boxes in accordance with regulations before transporting them to the packaging production point, resulting in paper shrinkage and film coating. Wrinkles are the responsibility of the supplier, so all after-sales expenses incurred in this gift box wrinkle accident will be borne by XX Company. After all the products in this batch have been digested, they will be reviewed and approved by market supervisors and reported to the market management department for unified compensation by XX Company;

2. According to the "Measures for Handling Quality Problems" issued by XXXX [20xx] No. 46 》, impose a financial penalty of A similar phenomenon occurs again.

This report

XXXX Group Company

Quality Department Quality Accident Investigation Report 2

1. Cause of the accident

A quality accident involving book degumming occurred in October this year. After investigation, we can see this picture: some of the books we produced degummed, cracked, and dropped pages. The quality accident caused a lot of inconvenience to readers.

During the production process, the supply varieties of hot melt adhesive were changed. We did not require suppliers to provide various technical indicators of raw materials, nor did we conduct strict, scientific and careful material performance testing. The large-scale production is an important factor in the degumming of book backs. Understand correctly and use hot melt glue. Strengthening the testing of raw materials and excipients is of great significance to ensuring product quality.

2. Accident Analysis

1. The thoughts of individual captains on the rubber nail linkage line fluctuated. We did not do a good job in their ideological work, and we only lamented that we could not retain people.

In fact, people cannot be retained. You can keep them in the company, but you cannot keep them in this world. How to replenish fresh blood in a timely manner and improve the professional quality of employees through training so that each employee can master the necessary knowledge and operating skills. Better helping employees integrate into the enterprise, building a harmonious working atmosphere, and improving team spirit are major issues related to the smooth development of the enterprise.

2. The technical level of the captain is directly related to the stability of the quality of the perfect binding product. After the machine breaks down, the flatness and firmness of the spine are weakened because the maintenance and adjustment are not up to standard. The depth of the grooves on the book back cannot meet the process requirements, which reduces the hot melt adhesive bonding area and the bonding strength, which is an important factor in the degumming of the book back. Establish and improve equipment usage procedures and maintenance procedures.

3. Strict binding process operations and control of important processes are an important factor in obtaining satisfactory products. After the perfect binding line started production, we relaxed the inspection of large quantities of products and failed to keep track of the quality status during the production process, which ultimately led to a tragedy. We must truly recognize our mistakes and learn from them. Strengthen efforts and improve quality process management so that quality problems can be effectively contained.

3. Lessons learned and corrective measures

After the quality accident occurred, the company quickly launched a series of emergency measures. A large number of people worked under the stars, got up early and went to bed late, and made great efforts to complete the remedial work in a timely manner.

This quality accident caused great losses to the company. As a person in charge, I feel deeply ashamed and apologize to all parties affected by this accident.

The quality accident fully exposed our existing problems such as false work, weak supervision, lax management and dereliction of duty. It reflects the various bad phenomena existing in our workforce in terms of ideology, work style, and technical level.

Lean production issues! We must learn it and master it. The purpose of mastery lies in application. You need to learn knowledge, realize wisdom, go back to practice Taoism, and do your business. Really improve the management level and increase the enterprise's ability to resist risks! Quality Accident Investigation Report 3

1. Time of occurrence of quality problems:

March 19 and 23, 20xx

2. Location and circumstances of occurrence of quality problems :

The first pouring of 1-B1-C, 1-D/1-2~1-7 axes in Area I of the main factory building of NPR Yizheng Factory on March 16, 20xx, and the 1-B1-C and 1-D/1-2~1-7 axes on March 20, 20xx The 1-A/1-5~1-8 axes were poured for the second time on the same day. After removing the formwork of the foundation short columns, it was discovered that there were honeycomb pits at the roots of the concrete foundation short columns, including 1-B/1-2, 1-C/1-7, 1-D/1-4, 1-A/1- There are holes and leaking reinforcements at the roots of the four foundation short columns of the 5-axis, and there are serious quality problems.

3. Cause Analysis

1. Because the construction operators had a weak sense of responsibility and poor operating skills when pouring concrete, and did not operate in accordance with operating procedures and technical explanation requirements, the Insufficient or excessive vibration of concrete results in honeycombs, pitted surfaces, holes, and leaky reinforcements in the basic concrete structure.

2. The on-site management personnel did not properly control the quality of the construction process after the technical briefing, and did not conscientiously implement the technical briefing requirements.

3. The quality inspection personnel did not check and control frequently enough during the construction process, and did not conduct follow-up supervision during the concrete pouring construction.

Quality problems occur due to the above reasons.

IV. Losses caused by quality accidents

The reputation of the company is damaged, which also causes project delays and waste of labor, materials, and machinery.

5. Opinions on responsibility for handling quality issues:

1. Because the operators of Liu Yuping’s construction team did not pay enough attention to the quality of the poured foundation concrete, the operators had a weak sense of responsibility and poor operation skills. The main cause of quality accidents and waste of labor, materials and machinery. According to the relevant regulations of the project department, Liu Yuping's construction team was fined 1,000 yuan, and the operators were fined 200 yuan. The labor, materials, and machinery costs for on-site rework were all borne by Liu Yuping's construction team. All personnel who do not meet the on-site construction quality requirements will be removed from the site before March 24, 20xx.

2. The on-site management personnel of the project department failed to strictly implement the project quality management system due to insufficient on-site management. According to the relevant documents of the company and the project department, the relevant personnel were punished as follows: Tang Zhirong was responsible for the failure of quality management. The main responsibility was fined 200 yuan; Yang Fengzhou was directly responsible for the quality accident because he failed to organize the construction according to the technical explanation requirements. He was fined 200 yuan for the ineffective organization. Liu Zongyou was fined 100 yuan for the failure of technical explanation and technical guidance. Wang Xinguo was fined 100 yuan. Those who fail to supervise the on-site construction process will be fined 100 yuan.

3. Through the occurrence of this incident, the project department will take a warning, further strengthen various internal management work, and strengthen the quality, safety, and civilized construction of project managers and all construction personnel. Education work to raise everyone’s awareness and prevent similar incidents from happening again.

6. Accident technical handling measures

For main factory building area 1-B/1-2, 1-C/1-7, 1-D/1-4, 1 -The four foundation short columns of the A/1-5 axis with serious quality problems are required to be smashed and reworked. Before construction, it must be re-inspected and accepted by the professional engineer of the construction unit before the next construction process can be carried out.

Repair the remaining foundations with quality problems. The specific methods are as follows:

1. Chisel away the loose concrete at the honeycomb and clean up the mortar, debris, etc. Sprinkle water to moisten.

2. Set up a formwork around the foundation short column. The bottom of the formwork is 2cm below the hollowed out part and the height is 2cm higher than the highest point of the hollowed out part.

3. Use C30 fine stone concrete mixed with micro-expansion agent (the dosage is 15% of the cement dosage) around the hollowed-out part, and compact it with a steel rod.

4. Cover and water for curing within 12 hours after the concrete is compacted. The curing time should be no less than 7 days.

5. After the concrete strength reaches 1.2N/mm2, remove the formwork, use a small cutting machine to cut off the excess concrete according to the cross-sectional size of the foundation short column, and smooth it neatly.

6. Use 1:2 cement mortar to fill and compact the pitted areas, and perform focused maintenance on the repaired areas during basic maintenance.

7. Each process must be inspected and accepted by a professional engineer before the next process can be constructed.

VII. Preventive measures

1. Organize all construction personnel of Liu Yuping’s subcontracting team and on-site management personnel of the project department to hold an on-site quality accident analysis meeting to carefully analyze the causes of quality accidents and require All construction personnel involved in the construction will learn lessons from this, strengthen their quality awareness and work responsibility, and fundamentally eliminate the recurrence of quality accidents.

2. The project department will organize all on-site managers to hold a special quality management meeting to clarify quality management responsibilities and assign responsibilities to each person. Strictly control the construction quality, requiring full-time quality inspectors to track and supervise each process, and control the entire process to prevent similar quality accidents from occurring.

9. Measures to improve construction methods

In order to ensure that similar quality problems will not occur in the foundation concrete, in the future foundation concrete pouring process

During the operation, it is required to pour the foundation concrete to 10cm above the lower opening of the short column, and vibrate this part of the concrete to make it dense. After a period of time, continue pouring the remaining short column concrete in time before the concrete for the cap is initially set. When vibrating The vibrating rod should be inserted into the concrete of the platform no less than 10cm to ensure that the upper and lower layers of concrete are fully bonded and dense. Quality Accident Investigation Report 4

Since reinforced concrete structures have been widely used in construction, a large number of quality accidents have occurred at home and abroad, causing huge casualties and economic losses.

Case 1xx Company’s comprehensive building has a frame structure on the ground floor with a floor height of 5.4m, and a brick-concrete structure on the 2nd to 5th floors, which is used as a multi-story dormitory for 2 units, with a floor height of 3.0m. After the complex building was put into use, cracks were discovered one after another in the walls and frame beams of the two-story building.

Case 2xx Rainbow Bridge is a central-supported steel tube concrete basket arch bridge with a length of 140 meters, a main arch clear span of 120 meters, a total bridge deck width of 6 meters, and a clear width of 5.5 meters. Without applying to the relevant departments for project approval, the original designed caisson foundation was changed to an enlarged foundation during construction, and the foundations were embedded in the cornerstone.

The main arch steel pipe was processed into 8-meter-long standard sections by the Labor Service Department of XX General Machinery Factory. The full-arch steel pipe was welded and assembled together without any quality assurance information and without acceptance of the standard sections. After the steel pipe arch is formed, the sections within the pipe are filled with concrete. One day, more than 30 people were walking on the Rainbow Bridge, and 22 armed police soldiers were training. When they were running in formation from west to east and reached about two-thirds of the way on the bridge, the entire bridge suddenly collapsed, and the people and armed police soldiers on the bridge collapsed. All fell into the river.

Case 3xx The roof of the conference room on the fourth floor of the Measurement Department of the Heavy Machinery Factory suddenly collapsed, causing 42 deaths, 46 serious injuries, 133 minor injuries, and a direct economic loss of 3 million yuan. The factory was built on the three floors of the original measurement office building and expanded to four floors. The conference room is located on the east side of the connecting floor, with a length of 21.85 meters, a width of 14.9 meters, and an area of ??325.6 square meters. The overall building is a hybrid structure with cast-in-place ring beams, light roof trusses, reinforced concrete hollow prefabricated panel roofs, and indoor cement floors.

Case 4 A station in xx province has built three light bridges, each with 8 holes. The light bridge spans the railway, and trains and other vehicles can be parked under the bridge. The bridge deck beams are V-shaped folded plates and are the main load-bearing components. The decking on the V-shaped folding plate only serves as a lateral support and also plays a role in transmitting the upper load. The folding plate and the cover plate are connected by distributed ribs. After erection and assembly, concrete is poured into the whole structure. One day, when a train passed under the light bridge, the folded plate beam of the easternmost hole of the light bridge suddenly collapsed from one end and broke the second column, causing the second hole beam to collapse. Fortunately, there was a hole in the hole. When the truck carriage was parked, the beam blocked the carriage after it hit it. It only caused the tilt of the third column but did not cause more continuous collapse.

1. Statistical analysis of causes of engineering accidents

Accident case analysis shows that the causes of building collapse accidents can basically be summarized into the following categories:

1.1 Design reasons (such as cases 1)

(1) Exploration error. Errors in engineering geological survey failed to reflect the actual situation or failed to identify unfavorable stratigraphic characteristics, resulting in the adoption of incorrect solutions in foundation design. This can lead to structural instability, cracking of the upper structure or even collapse.

(2) Error in design calculation plan. Due to urgent tasks, tight time, calculation and drawing errors, no careful proofreading; loads were omitted or undercalculated; the issues involved were relatively complex and inappropriate simplifications were made; some even thought that the original design had safety reserves and arbitrarily reduced the design. Small cross-section, less steel bars or lower material strength level; low reliability during design, etc. The foundation is placed on two or more soil layers with widely different bearing capacities and is not properly handled; for example, the length of the house is too long and expansion joints are not installed as required, and the plan is inappropriate.

(3) Improper handling of structural details. Some designers emphasize calculation and neglect construction, thinking that structural processing is not very important, so they do not design carefully. For example, there is no beam pad under the girder; improper setting of embedded parts; insufficient anchorage length of steel bars; unreasonable node design, etc.

　1.2 Construction reasons (such as case 2)

(1) Reinforced concrete materials are of poor quality. The quality of project materials is poor and they are not inspected as required before entering the site, resulting in unqualified materials flowing to the artificial site, such as unqualified steel bars, cement, and gravel, and improper mix ratios of concrete and mortar.

(2) Violation of design and specifications. The construction is not carried out according to the drawings, and special construction plans are not formulated as required for special structures. Temporary facilities or maintenance facilities are not set up as required. Violation of relevant design or quality acceptance specifications.

(3) Management chaos. On-site management and construction organization are chaotic, illegal operations are carried out, and quality and safety supervision and inspection are not in place. Many on-site managers have weak quality awareness, do not pay attention to the signs of accidents that have occurred, and fail to take effective measures in a timely manner, which leads to tragedies.

1.3 Reasons for improper use and modification (such as case 3)

(1) Arbitrarily increasing the load during use. For example, the original design was a static workshop, but power machinery was installed later. Excessive vibration of the equipment caused excessive deformation of the house; the civilian residence was converted into an office building, and large equipment not considered in the original design was installed, and the excessive load caused the floor to break; the civilian residence Overweight and excessive debris (such as briquettes) stacked on the balcony can cause the balcony to crack or even fall over.

(2) Improper layering. Recently, due to economic development, it is more common to add floors to old houses. A committee for adding floors and strengthening houses has even been established, and the business is booming.

However, some units reinforce their own buildings and blindly add floors without carefully checking the original houses. The resulting accidents have occurred in many provinces and cities across the country.

(3) Improper maintenance and transformation. Some users arbitrarily open holes in the structure, and arbitrarily remove columns and walls in order to expand the use area and obtain a large space, causing damage to the load-bearing system and causing accidents. Some houses originally had lightweight roofs, but users added insulation and waterproof layers in order to maintain heat and insulation. As a result, the roof trusses were deformed excessively, and in severe cases, the houses collapsed and were destroyed.

(4) Change the usage function. Violate the design use function, increase the use load, exceed the original design bearing capacity, or fail to pay attention to the changes in the working environment during use, and fail to consider additional loads, which will eventually lead to damage.

1.4 Prestressed defect accident (such as case 4)

(1) The prestressed tendons are unqualified. The surface of the steel bars is corroded, and yellow floating rust appears on the surface of the steel bars. In severe cases, it turns red, and turns brown over time. The strength of the steel bars is even insufficient due to negligence in the inspection of the steel bars before leaving the factory, resulting in the entire batch of materials being scrapped; the cold bending performance of the steel bars is poor, and the steel bars contain carbon The amount is too high, or the content of other chemical components is inappropriate, or the steel bar rolling is defective; the elongation of the cold-drawn steel bars is unqualified, the carbon content of the steel bar raw materials is too high; the cutting length is inaccurate, crosses occur when the bars are threaded, and the steel bars are upset The head is not qualified, etc.

(2) The anchorage is unqualified. Prestressed tendon slippage mainly occurs when clip-type anchors are used to anchor steel bars or steel strands. After the prestressed tendons are anchored, they slip from the clips, causing the anchor to lose its anchoring ability; the combined size of the screw rod and anchor ring is too small. The joint part between the screw rod and the anchor ring is too short. When the tension reaches a certain tonnage, the screw rod and the anchor ring suddenly detach, and the anchor ring is driven to the intersection of the enlarged hole and the general hole, where it is broken, or the jack falls with the screw rod; There are also broken screw end rods, deformed screw end rods, and cracked anchor rings.

(3) Accidents during tensioning. The tensile stress is out of control, the elongation value of the steel bar does not meet the regulations, the tensile stress causes cracking or damage of the mud concrete components; the strength of the concrete is insufficient; the local concrete at the tension end is not dense; the steel bar (wire) slips during tensioning; the surface of the steel wire is contaminated ; The concrete is not dense and has low strength; the pre-tensioning method is too early and the tensioning process is improper.

2. Conclusion

While reinforced concrete structures are widely used, their accidents have also attracted widespread attention. Through accident case analysis, the following basic conclusions are obtained: In addition to design, construction errors, improper use and other reasons for existing building collapse accidents, unreasonable building structural systems are one of the main reasons for span collapse accidents in construction projects.

The analysis results can provide data support for engineering risk management, and also help the engineering community have a comprehensive understanding of reinforced concrete structure accidents, so that more effective supervision and management can be carried out in actual projects to reduce accidents. occurrence. Quality Accident Investigation Report 5

The new product jointly developed by China xx Research Institute and xx Company Yarn Yarn Factory *** - anti-static wool-like gabardine has been put into trial production. The main quality indicators of the fabric meet the standards of the Ministry of Textile Industry.

The anti-static performance indicators are significantly better than the Japanese industrial standards and the listed performance indicators. The quality issues in trial production are analyzed below.

1. Quality Management System

The production system of the yarn-dyed weaving factory of xx company includes main workshops for spinning, dyeing, preparation, weaving and finishing. Product quality analysis report. A relatively complete production line has been formed from spinning to finished products. For many years, foreign trade export products have been mainly exported. This year, it is 100% exported. The export qualification rate in 20xx was xx%, and the export qualification rate from January to June in 20xx was 95%, an increase of 6.01% over the same period last year. Over the years, we have accumulated rich experience in production and quality management. The company has a quality management system that is suitable for production and has 200 full-time quality management and inspection personnel, accounting for 13.3% of the company's employees. The factory director and engineers are in charge of quality work. The Quality Inspection Department is specifically responsible for the product quality of each workshop, and quality inspection outlets are set up in key links of each production workshop. At the same time, the Quality Inspection Department dispatched full-time personnel to supervise and spot-check, implement three-level inspections, and absorb advanced comprehensive quality management methods based on the original traditional management, combine quality work with the economic responsibility system, and establish a 100-percent assessment system. system, and held total quality management training classes for middle-level department and workshop cadres.

2. Quality Assurance Measures

In order to provide a basis for future trial production, the company conducts laboratory testing and testing of raw materials and raw yarn as soon as they enter the factory, and at the same time strictly controls to ensure product quality. , specially formulated. Product quality analysis report. In the trial production of new products, the entire factory gave full play to the cooperative role of the workshop and [[functional departments]] and the checkpointing role of each testing network. At the same time, the significance of the new anti-static products was widely publicized to inspire employees' sense of ownership and responsibility. Quality analysis meetings are held regularly every week to predict, analyze and deal with problems that occur in production. In order to learn the quality of new products in a timely manner, the chief engineer of xx Textile Science Research Institute visited users in person and fed back the quality information to the yarn-dyed factory in a timely manner.

3. Quality level analysis

(1) Off-machine quality and warehousing quality (omitted)

(2) Physical indicators (omitted)

(3) Dye fastness (omitted)

(4) Anti-static performance indicators (omitted)

The above situation shows that the main indicators of this product have reached the textile industry The anti-static performance index is significantly better than similar Japanese products and has good anti-static performance. Therefore, the production process of anti-static wool-like gabardine is feasible, the trial production is successful, and the level is advanced.

IV. Problems and Directions

Although the trial production of anti-static wool-like gabardine has achieved good results, there are still some problems. For example, due to the small batch size during the initial trial, and due to limitations of processing conditions and experience, some color differences occurred during post-finishing processing, making the finished product not completely perfect and not 100% able to achieve the expected goal. Currently, a solution has been found for this problem. The focus of future work is to increase research on product structure and performance on the basis of strict quality control, and increase [[product functions]] to make it more suitable for market demand.

xx company

　xxxx year x month x day;