How to prevent galvanized embedded parts from shifting or their galvanized coating from being damaged during concrete pouring?
Publish Time: 2025-12-03
In construction engineering, galvanized embedded parts serve as a crucial link between the concrete structure and subsequent steel structures, curtain walls, equipment, or pipelines. Their installation accuracy and surface integrity directly affect the safety and durability of the overall structure. However, during the dynamic and high-impact construction process of concrete pouring, embedded parts are highly susceptible to displacement due to vibration, concrete flow impact, or worker trampling. Simultaneously, their galvanized coating can be damaged by collisions, friction, or improper handling. Shifting positions will prevent precise alignment of subsequent components; damage to the galvanized coating will weaken corrosion resistance and create a risk of rust. Therefore, effectively protecting galvanized embedded parts during pouring becomes a critical aspect of construction quality control.The key to preventing shifting positions lies in "rigid fixing." During the reinforcement cage binding stage, embedded parts must be securely anchored to the main reinforcement or formwork support system using welding or specialized clamps. This fixing is not a simple spot welding, but rather employs multi-point, multi-directional constraints to ensure it cannot wobble in three-dimensional space. For example, a "well"-shaped frame of positioning reinforcement is often added to the four corners of the anchor plate to firmly lock it in place from four directions. For tall or cantilevered embedded parts, additional diagonal bracing or temporary supports are required to resist the overturning moment caused by the lateral pressure of the concrete. Furthermore, precise layout and verification are necessary before construction, using laser line projectors or total stations to calibrate coordinates and ensure accurate initial positioning, laying the foundation for subsequent anti-disturbance measures.Meanwhile, the protection of the galvanized layer must be maintained throughout the entire process from transportation and installation to pouring. First, dragging, throwing, or direct impact of metal tools on the surface of the embedded part should be avoided during handling and hoisting. Some projects require covering the galvanized surface with a flexible protective film or wrapping it with foam padding, especially strengthening the protection of vulnerable areas such as protruding parts like threads and anchor bar ends. Second, during the process of reinforcing bar binding and formwork erection, it is strictly forbidden to use the embedded part as a scaffolding support point or a platform for stepping on. During construction handover, the rule of "no stepping on embedded parts" should be clearly stated, and warning signs should be set up.During the concrete pouring stage, operational details are particularly critical. The vibrator must not directly contact the embedded parts; a safe distance should be maintained, allowing the concrete's own fluidity to fill the surrounding gaps. If the vibrator is too close, the high-frequency vibration may not only loosen the fixing points but also cause the hard vibrator to scratch the galvanized layer, resulting in localized peeling. Experienced construction teams will assign dedicated personnel to supervise the entire process, observing the embedded parts in real time. If even a slight displacement is detected, pouring should be immediately stopped and corrected. Furthermore, the concrete discharge port should avoid areas with dense embedded parts to reduce the impact of the material flow. For large volumes or highly fluid concrete, layered pouring and slump control can be used to reduce peak lateral pressure.It is worth mentioning that some high-standard projects adopt a "post-galvanizing" strategy—that is, the embedded parts are installed and the concrete is poured first, and then the exposed connection parts are thermally sprayed with zinc or coated with zinc-rich paint after the structure has formed, to compensate for any plating damage that may have occurred during installation. However, this method is costly and struggles to cover the interface embedded within the concrete. Therefore, the optimal solution remains "one-time, full-process protection."Ultimately, protecting galvanized embedded parts is not merely a technical issue, but also a reflection of management and awareness. It requires collaboration among design, manufacturing, and construction parties: the design team provides clear positioning diagrams, the manufacturing plant ensures coating quality, and the construction team strictly adheres to process discipline. When each pre-embedded bolt is firmly and smoothly embedded in the concrete, it bears not only the future load but also a silent promise of a century-long commitment to the quality of the project. Behind these seemingly ordinary embedded components lies a reverence for detail and a respect for time.
