In the nearly two years since the construction of the Yueqing Bay Bridge, the construction of the main bridges of No. 1 and No. 2 bridges has not caused any rework due to data or quality problems. No one beam has been prefabricated incorrectly. It is rare in similar projects across the country.
Accuracy is higher than the specification, and "zero error" can be achieved. The main reason behind this is BIM (Building Information Mod⁃eling), a management achievement ranked by the Ministry of Transport as the top ten innovative technologies.
Without much experience to draw on, CCCC Public Office integrates various relevant information of the project through parameter models according to the needs, and gives the model functions according to local conditions, and realizes visual management with big data, bringing intelligence, Precise selection, to achieve precise control, improve work efficiency, save costs and shorten the construction period.
In addition, CCCC No. 1 Public Administration Bureau integrated BIM into every construction content of the main bridge to achieve full life cycle management. The systematism and meticulousness of applying BIM technology are at the forefront of the country.
The major function of accurate correction of BIM big data is to preview the situation of structure and structure collision. According to statistics, with the help of BIM visual inspection, there were 81 "collision corrections" in the main structure and temporary structure of the Yueqing Bay Bridge. In addition, in each process, the BIM technology platform uses the deduction of three-dimensional solutions to visualize and make precise decisions to technicians.
The reporter at the prefabrication factory saw that the system platform was equivalent to the electronic brain of the entire prefabrication factory, which controlled the construction equipment, materials, products and operating personnel information on site in real time. Here it is as fine as each bundle of steel bars, each package of materials, as large as each device, each beam, and has its own QR code, which means that the information from the material to each product has its own "electronic ID card". Formed millions of databases.
Site managers and workers can quickly find the location information of the target segment beam on the screen. For example, if the beam is to be displayed 4 days on the day, the corresponding position model on the screen will be displayed in red, and the beam information label will be automatically generated at the same time. Similarly, the basic information of the tire frame and pedestal of each production line in the construction, the current process, etc. are all directly reflected on the system, and the team leader can efficiently organize the workers to carry out the work.
Sixty to seventy percent of the project's funds are used for materials, whether the materials are qualified, the use is standardized, and traceability can be traced everywhere. There are more than 40 sets of large-scale equipment with more than 100 tons at the peak time of bridges 1 and 2. It is not only important, but also a major source of danger. The use situation and when to maintain can be viewed and retrieved through the platform or mobile app, or reminded by the system. Where does the beam plate exist and how long it has been stored? Whoever operates and so on can be checked at any time, as far as possible to ensure that there is no problem with each beam, or that problems can be corrected in time.
With the support of BIM technology, precise control of construction costs can also be achieved well. Before the start of the project, the project department calculated that the bridge construction needed to invest 3.33 bridge cranes, that is, 4 equipment. With the help of BIM calculations, the project department only needs to increase the assembly efficiency by less than 10%, which can reduce one bridge crane and save nearly 20 million yuan in equipment investment. Another example is how much paint is used on the surface of steel anchors. Now, the surface area and thickness of the steel anchor box are accurately calculated through three-dimensional solids. Naturally, how many barrels of paint are actually used can also be calculated.
In September last year, the China Highway Society's "BIM Promotion and Application Technology Exchange Conference in the Transportation Field" was held in Hangzhou, representing the most advanced and high-end level of BIM technology in China. What's even more gratifying is that at the end of last year, the results of BIM-based multi-dimensional information collaborative management won the 15th ministerial first-class national transportation enterprise management modernization innovation achievements.
Dream Building · Transformation
Standardization of teams to create industrial workers
Bridge No. 1 and No. 2 run through "two or three places". At the peak, a total of 1,524 workers were working on the site, and the scene was spectacular. Such a 10,000-meter bridge has a large number of construction sites, a wide area, and a large number of people, and it has become very difficult to manage. To achieve the most accurate control in the country, the management must be more sophisticated.
CCCC No. 1 Public Administration Bureau has actively implemented the new concept of personnel management proposed by the Yueqing Bay Project Construction Headquarters: promoting the standardization of 6S team operations, and transforming migrant workers into industrial workers.
According to the relevant person in charge of the project department, according to the traditional model, the management team is not detailed enough, and it is not realistic to directly manage front-line migrant workers. Teams are the smallest units to complete sub-items. Even if teams are changed, the impact on the project is relatively small.
To meet the standards of industrial workers, excellent technology is the key. While promoting the standardized construction of teamwork, the first bureau of CCCC also actively implemented the "first team system" regulations. For example, the team doing the pillar must make a qualified pillar before they can continue to do it; if it fails, the training will be dismissed if the training is done more than 3 times.
Since the start of construction, there have been 64 teams and bridges in Bridge 1 and Bridge 2, and 15 teams and teams have been eliminated. The headquarters has also used 5% of safety funds to promote team standardization. Deterrence and rewards are two-pronged, and the teams working here are increasingly meeting "high requirements."
In addition to technology, the project department also requires rapid improvement of the quality of migrant workers. The way the project department wants to benefit from management is to strictly implement the "6S" process management of the team. For example, the rebar processing plant covers an area of 4,100 square meters and is divided into five areas: raw material storage area, rebar processing area, semi-finished product area, waste area, and safe passage. Factoryization and assembly line production are implemented. Workers are strictly required to organize and rectify the construction site according to the process, reasonably set up related facilities, equipment, and material areas, and use spraying marking lines or making signboards to effectively mark the site in an orderly and tidy manner.
There are also special people to urge the team to implement the "6-step walking" daily cycle operation process, that is, pre-shift reminders, pre-shift inspections, intra-shift inspections, post-shift cleanups, post-shift transfers, and post-shift summaries to maximize the requirements of industrial workers.
Such strict requirements make the qualified rate of the component size reach 100%, and the accuracy of the reinforcement processing can reach an angle of 0.5 ° and a length deviation of 1mm, which has become an important guarantee for the accuracy control of the broken beam.
The “Standardized Management of Team Operations” implemented by the project department also won the 2015 Second Prize of National Transportation Enterprise Management Modernization Innovation Achievements.
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