Sany Heavy Crane Suspension of 1 Person Continued: Equipment Manufacturer Says Job Data Is Deleted

Quality problems or improper operation, crane owners and manufacturers have their own arguments

The investigation team stated that the investigation is still in progress, and if necessary, or through experiments to restore the incident, determine the final cause.

At 5 o'clock on the morning of April 9 in Hangzhou, on the construction site of Wulin Square in Hangzhou, a crane arm of more than 60 meters slammed onto the stadium road, not only causing one worker to be killed. The accident also directly interfered with the morning peak traffic, and 18 bus lines were temporarily changed. . Similar accidents not only occurred this time. In early 2014, similar problems took place in the same section of cranes and the same links. Therefore, the public was eager to know the cause of the accident earlier.

After the incident, although the related functional departments in Hangzhou formed a joint investigation team and launched an investigation on the same day, the final announcement of the conclusion of the accident still required some time.

In a reporter’s follow-up visit, it was discovered that before the official conclusion came out, the crane manufacturer, the crane owner, and the construction unit had disagreed on the cause: the crane manufacturer thought it was improperly operated; the crane owner and the construction unit insisted that it was product quality. problem.

Quality problems VS improper operation

The crane owners and crane manufacturers have different opinions

As early as the date of the incident, the responsible person of the construction unit - Hongrun Construction Group Co., Ltd. (hereinafter referred to as Hongrun Construction) raised doubts about quality issues. Yesterday, the reporter contacted the owner of the accident crane – Shanghai Feishan Construction Equipment Installation Co., Ltd. (hereinafter referred to as Feishan Construction).

It is understood that the crawler crane, model number SCC3200, equipment number 09cc03200068, and Sany Group Co., Ltd. is the production company. "The machine was purchased by our company to Sany, and then leased to the construction site." Manager Zhu Fei of the Feishan Construction Department said that the crawler crane that was involved in the accident was purchased in August 2009 and cost more than RMB 13 million. The working period is 20 years.

Regarding the cause of the accident, Zhu, manager of Feishan Building, thought that it was the quality of the machine itself. “There is no problem of operation. The operator is trained by our company. People and vehicles are rented to Hongrun Construction. He has more than ten years of operating experience. Afterwards, we also asked him that the operation process is in line with the standard.”

In the same way, Hu Fangjian, the project manager of the construction party's Hongrun Construction Project, also tends to talk about quality issues. “We compared the accidents of the cranes of the same model in early January in a construction site in Hangzhou. From the point of view of the fracture and the shape of the breach, it is almost exactly the same. Things wouldn’t be so good?”

In response, Sanyi Group Co., Ltd. stated that “the accident can be initially characterized as a number of customer's illegal operations” on the grounds that “crawler lifting is strictly prohibited for pile-pulling operations. To do this, there must be specialized powerful cranes. The price is several times that of the universal crawler crane. Therefore, the accident can be initially characterized as a number of irregular operations by customers."

In this regard, Hu Fangjian emphasized that at the time of the incident, the pile base was lifted by a hydraulic pump rather than a crane. "Because cement piles are deeply inserted into the soil and the clay is sticky, it must be lifted from below by an oil pump. Otherwise the cranes with large tonnages will not be able to lift."

Is there any overload?

320 tons of load and 80 tons of lifting material

With a good crane, the “pulling rod” breaks down during construction operations, and many outsiders naturally think of a question: Is there overload?

In the case of an accidental crane, the load is 320 tons. The machine itself has a recorder similar to a black box. It can record some data in construction, including the weight of the lifting object.

After the incident, investigators from Sany Group Co., Ltd. once stated that "Our company personnel arrived at the site one hour after the accident and found that the data on the day of the operation had been manually deleted." However, this claim was also met with "flying mountain construction." The negation of "Hongrun Construction". “We have submitted the data to the accident investigation team. At that time, I took pictures of the scene. There was only 80 tons of lifting material and the load from the crane was still far away,” said Hu Fangjian.

Manager Zhu of Feishan Construction also gave an affirmative statement after asking the operator: there is no overload.

However, Sany Group Co., Ltd. still insists on "overloading 113% at the time of the accident." Their explanation is that even if the lifting object itself is not overloaded, the pulling force during the pile-pulling process is unpredictable and often reaches the limit of the equipment. At the same time, the force is changed during the upward pulling process of the pile, especially when it is pulled out instantly. The big boom rebounds, and repeated operation is easy to fatigue and failure. With such a strong operation, the equipment life is often only a fraction of the normal lifting operation.

Accident investigation team:

The determination of the reason is still in progress

Although the arguments of all parties have their own reasons and evidence, the reason for their effectiveness is that the authority of the accident investigation team led by the safety supervision department should issue it.

Yesterday, the reporter telephoned the relevant person in charge of the accident investigation team. He said that the investigation is still in progress and there is no content that can be announced. "When necessary, we may also need to go through experiments to rectify the incident and determine the final cause."

For the time required to obtain the investigation conclusions, the relevant regulations are within one month, but the investigation team stated that if there are special circumstances that need to be postponed, the investigation team will also report the application to the Municipal Safety Supervision Bureau.

As for the same model, the same problem also occurred in Hangzhou. The relevant person in charge of the investigation team stated that they had already known through the news media, but the main energy of the moment will still be on the investigation of the cause of the crane accident at Wulin Square.

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