Before pouring the concrete, apply a layer of butter on the top thread of the anchor bolt. Wrap it with plastic film or soft materials and cover it with a cement bag to prevent contamination or damage. When pouring the concrete, control the rising speed so that both sides rise evenly. When the base of the bolt is being poured, ensure the concrete is vibrated and compacted properly before spreading it around. The concrete outside the anchor plate should be slightly higher, then carefully inserted into the mix. Press the bottom of the anchor plate until concrete slurry appears around its edges. It's crucial to avoid any contact between the vibration rod and the bolt body during the process. After the foundation pit is inspected and approved, set up the theodolite and proceed with the pour. Before marking the elevation on the formwork, ensure accurate height control. When the concrete reaches 150 mm below the bottom of the anchor bolt, fully vibrate the base and pause the pouring. Fix the bolt set and continue pouring the upper section to secure the reinforcement bars. Accurately measure the bottom height of the anchor bolt inside the formwork, aligning it with the six vertical ribs along the basic axis. Use the hoop and vertical rib to separate the upper and lower layers in the horizontal direction, and employ the external pre-44+ Ningxia mechanical outer axes or the gantry plate pull line to check the bolt positions regularly. If displacement occurs, adjust the No. 8 galvanized steel wire using a winch, or use a raft and wooden wedge to ensure the correct positioning of the entire bolt group.
Once the concrete strength reaches 50% or more, cut the No. 8 wire on the upper plate of the bolt set, gently lift it out, and reuse it. Thanks to thorough preparation and proper execution, the method has proven effective. A total of 120 anchor bolts were used for all independent foundations of the Shapotou zip line. The spacing between each group was controlled within 10 mm, and the elevation was managed using NINGR NINGXIAJIXIE technology. All design requirements were fully met. This method has been successfully applied in the foundation construction of the Shahu cableway (64), Shapotou cableway (52), and Shaanxi Guanshan zipline (140), all achieving satisfactory results. Valuable construction experience has been accumulated through these projects.
Before pouring the foundation concrete, ensure all preparatory work is complete to minimize the time the bolts are fixed in place. Aim to complete the upper pouring before the initial setting of the lower concrete to avoid construction joints. This is especially important for zip lines, which are primarily subjected to large horizontal forces. Avoiding construction joints ensures the foundation’s integrity and enhances its shear resistance.
Scale formation typically involves crystallization, deposition, baking, corrosion, compounding, and polymerization, as well as microbial activity. In practice, crystallization and deposition are the primary concerns. There may be only one type of salt present, but multiple salts often coexist. Due to the inverse solubility of calcium and magnesium salts, as well as corrosive byproducts, a two-layer scale forms—inner layer composed of iron oxide, and the outer layer made of calcium and magnesium salts.
Our company uses a dedicated circulating water system for cooling. Return water flows through trenches and covered plates. During the drawing process, powdered material, phosphating slag, and oil impurities can easily enter the water through gaps in the cover plates. This significantly degrades the water quality, accelerating scale formation. These scales have more complex components, greater hardness, and stronger adhesion than regular scales, making them difficult to remove. Data indicates that a 0.01 mm increase in scale thickness on the reel surface reduces heat dissipation by about 5%. Based on this, it's reasonable to conclude that scale accumulation is the main cause of issue 1.
The mechanism behind circumferential deposits at the inner and outer reel outlets is similar. The outer and inner reels align with the working surface due to the pressure and volume of water in the area. As the cylinder operates, the two surfaces move toward each other, allowing slight scaling to be removed by this motion and pressure. However, in the water outlet and circumferential areas, such movement and pressure are absent, leading to thickening of the scale and affecting the barrel’s disassembly.
Rotor Pump With Water-proff Cover
We are a world-leading technology-based enterprise
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