Anchoring boutique projects to create offshore "concrete" walls and iron walls

On the coast of the South China Sea, with flat tides and wide shores, there is a roaring sound of ships. Eight giant caissons stand at the E1 berth in Bohe New Port Area, Maoming Port, Guangdong

On the coast of the South China Sea, with flat tides and wide shores, there is a roaring sound of ships. Eight giant caissons stand at the E1 berth in Bohe New Port Area, Maoming Port, Guangdong. Workers are working hard to carry out the construction of the upper breast wall.

Since the pouring of the pier breast wall, the 'concrete' wall and iron wall have begun to take shape, "said Jiang Hua, the project manager of the 300000 ton crude oil terminal project in Bohe New Port Area, Maoming Port, Second Company of China Communications First Navigation Bureau.

The 300000 ton crude oil terminal project in the Bohe New Port Area of Maoming Port is a landmark project for the construction of the "Deep Water Port" in the Bohe New Port Area of Maoming Port. After completion, it will become an important new maritime energy channel in China. The pier breast wall is made of cast-in-place concrete, with a total consumption of 7333 cubic meters. The largest pier breast wall has a concrete consumption of 2322 cubic meters, a thickness of 6.3 meters, and a pouring area equivalent to the size of a basketball court. Large scale concrete pouring at once is prone to concrete cracking due to temperature changes. In addition, the project is located in the western region of Guangdong, with frequent high temperature and rainy weather, Therefore, controlling the temperature of concrete is the key to creating a "concrete" wall and iron wall.

To create a high-quality project, we need to achieve temperature control throughout the entire process from various aspects such as concrete production, transportation, pouring, and maintenance, "said Du Lu, the project chief engineer. The project team conducted thorough research on the hydrological and meteorological conditions in the Maoming area throughout the year, without engaging in unprepared battles. Du Lu led a technical team to conduct repeated experiments and inspections, adjusting the impact of different admixtures on the hydration temperature rise of concrete. The project team used Portland cement, with a large proportion of powder that met quality requirements, to control the hydration temperature rise of concrete, and tried to dilute the unit cement dosage while ensuring the strength of the concrete, successfully reducing heat release.

The internal contradictions have been resolved, but how to accurately control the temperature generated during the production and transportation process of concrete has been a topic of debate at the on-site difficult discussion meeting. During the meeting, Quality Director Mu Jiaping was instantly inspired: "Merchants selling seafood near the project department would add ice to the seafood in the insulation box, set up a sunshade, and maintain the temperature. Can we also adopt this approach?" Following this approach, the project team added ice cubes to the water during the mixing process and strictly controlled the concrete outlet temperature to be within 30 degrees Celsius. During transportation, measures such as sunshade and insulation are installed to effectively control the pouring temperature of concrete.

The most difficult task is to monitor and control the temperature during the concrete pouring and curing stages, "Du Lu explained

To this end, the project team has developed a "concrete wireless temperature measurement system", which embeds multiple reusable temperature sensors in the concrete. The remote system is used to achieve real-time monitoring and comprehensive perception of the concrete temperature during the pouring and curing stages. If temperature anomalies are found, measures such as geotextile coverage, water storage, and spraying are taken to achieve intelligent and information-based upgrades, achieving refined management, homogenizing temperature, and reducing temperature differences.

The 300000 ton crude oil terminal project in Bohe New Port Area of Maoming Port has not seen a millimeter level temperature crack since the start of large-scale concrete pouring at sea, becoming a true "concrete wall and iron wall" on the coast of the South China Sea. With excellent physical quality, we are confident in creating high-quality and high-quality projects, "said Jiang Hua.

(Reported by Bai Xiao, the client reporter of Dazhong Daily, and Zhang Heng, the correspondent)

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