blue sea and the blue sky, the No.64 to No.65 liquid bulk cargo berths in the six basins of Xuwei Port Area, Lianyungang Port, Jiangsu Province, circled like a giant dragon, embracing a bay of blue waves in the bosom, and the air ran through the rainbow. In September 2022,
From "blueprint" to "beautiful map", from imagination to reality, the Third Navigation Institute and the Third Navigation Bureau have jointly conquered a number of key technologies, and the Code for Design and Construction of Assembled High-pile Wharf has been established as an industry standard.
Draw a new blueprint
for the industry
modular assembly type high-pile wharf adopts the concept of "building blocks" to "dismember" the high-pile wharf into standardized components and non-standardized components, which are manufactured in batches in the factory and then transported to the construction site to form the wharf through assembly. The construction method of modular assembly high-pile wharf realizes that the wharf is manufactured in the land factory.
quality of
module prefabrication 
However, switching to onshore prefabrication does not mean that it is simple and easy to do. The maximum length of the π-type precast beam slab is 14.7 meters, the width is 9.2 meters, and the height is 1. As an important component of the wharf, the π-type precast beam slab bears the role of the "backbone" of the wharf and directly bears various loads and external forces acting on the wharf, so the quality requirements are extremely strict. "Although it is the first time to produce, we must guarantee the high quality of each beam and slab!"! The first step in the construction of
high-quality beams and slabs is the selection of formwork. At the beginning of the construction, the prefabrication team of the Third Navigation Bureau designed two sets of formwork schemes, namely, wooden formwork and integral steel internal formwork. However, after comparison, it is found that compared with the integral steel internal formwork, the wood formwork is not rigid and changeable, and the surface will be damaged for a long time, which will easily lead to the pitted surface of the poured beam slab.
Therefore, the construction team of the Third Navigation Bureau resolutely decided to adopt the integral steel internal mold. But soon after the start of construction, there was a problem of leakage at the notch where the steel bar extended out of the formwork, and the prefabrication team quickly carried out technical "consultation". After on-site investigation, the crux was quickly found. Originally, the exposed steel bar with a diameter of 14 mm has a gap of 2 mm with the notch of the formwork, which is not resistant to aging. Although the sealing strip is used for sealing, its elasticity is not good, and it is easy to leak slurry during pouring, which seriously affects the appearance quality of the beam body. If the problem of slurry leakage is not solved, it will certainly affect the splicing between the components because the quality is not up to standard. While thinking
hard, Zhang Guoming was inspired by the socket wrench of the repair team, and proposed to use the embedded steel sleeve to process the end of the steel bar into straight thread by rolling process, and connect the steel bar with the corresponding connecting sleeve, which can just cover the gap perfectly. In this way, not only the leakage-stopping effect can be achieved, but also the appearance is beautiful, the template is easy to disassemble and assemble, and multiple purposes can be achieved. The proposal was fully affirmed by everyone, and the processed steel bars were installed with sleeves, which effectively solved the problem of slurry leakage. The problem of slurry leakage has been
solved, and new problems have followed. "General Manager Zhang, the inner mold is adsorbed with the concrete and can not be demoulded normally." The construction worker in charge of formwork removal reported. Zhang Guoming immediately led the team to the demoulding construction site and held a seminar on assembled π-type beam and slab technology to discuss countermeasures.
"Since the integral steel inner mold is not good, why not divide the inner mold into two parts and use equipment instead of manual demoulding?"? With new ideas, the technical team visited experts and design units in the industry to seek solutions. After some research, we found the final "key"-hydraulic adjustable inner template. The inner formwork is divided into two parts, a hydraulic Jack is arranged below the top surface of each inner formwork, and the Jack is used for jacking the inner formwork up and down, so that the problem of formwork removal can be thoroughly solved. Faced with this "magical demoulding technique", the project technical team's heart finally fell to the ground. "It used to take six people to do the work, but now it can be done by two people. The appearance is very smooth, and there are no potholes at all. It's simply too powerful." Lao Li, a demoulding worker, said as he raised his thumb.
Not only that, in order to ensure the construction progress and quality, the construction team also purchased a special steam generator for concrete curing, to control the temperature and humidity, so that these "Big Macs" can be maintained in the greenhouse with high quality, and the speed of mold stripping has been increased from 5 days to 2 days.
At the same time, the construction team effectively combines information technology with quality management, and uses the combination of QR Code and sign spraying to indicate the product number, production date and operation time of the process. The QR Code contains specific information such as the person responsible for the process and the construction drawings, and creates an "identity card" for the π-type beam slab. "Once quality problems occur, technicians can quickly trace back to the relevant responsible persons according to their identity information and rectify them in time to ensure the excellent quality of π-type beams and slabs." Zhang Guoming said confidently.
Green environmental protection is effective
wharf components are installed by the new structure, they can immediately form a working face on the water, avoid frequent lifting of hoops, steel bars, templates and other cast-in-place materials on the water, reduce a large number of water and edge operations, and reduce the risk of water operations. In
the prefabrication yard, Wang Xingbei, the operator, is carrying out anti-corrosion treatment on the prefabricated components. "For more than 20 years, I have been working on the sea with my feet on the boat or tied to the safety rope, but I didn't expect to finish the work on the shore," he sighed as he brushed the anticorrosive paint. "Old chap, technology has advanced and times have changed." Cao Shizhong, the head of the construction team, patted Lao Wang on the shoulder and said. After the adoption of the full assembly process, the number of water operators has been reduced from the original "thousand people battle" to dozens of teams to tackle key problems, and the number of personnel has been reduced by 85%. Many of the water operation processes originally required by Wang Xingbei have been changed to land construction, which greatly reduces the pollution of building materials to the ocean, and effectively avoids the impact of long-term immersion in seawater on the durability of reinforced concrete in the traditional construction stage.
In addition, the project department uses large crane vessels instead of small construction vessels, which reduces the number of construction vessels on site by nearly half. At the same time, the oil pollution and waste discharge from ships are collected uniformly and transferred to land for centralized treatment. "This is an arduous process from scratch, from a piece of white paper to a blueprint.".We will continue to cultivate the hydraulic market and continue to explore and practice for CCCC in the field of assembly terminals. Guo Zhaojia, the chief designer of the project, said with emotion.
From imagination to reality, from the test of precast pile caps to the realization of full assembly of the main structure of the wharf, the Third Navigation Bureau and the Third Navigation Institute have made concerted efforts to build a "strong transportation country" and "intelligent transportation" as the lead, contributing to the compilation of industry design and construction standards and norms while promoting local economic development, and to the development of the industry. To contribute to the development of China's transportation and water transport industry.
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