Customized wet concrete spraying robotic truck | Specializing in UHPC steel fiber reinforced concrete spraying

With the continuous upgrading of high-end projects such as bridge reinforcement, marine protection, long-term tunnel support, coastal infrastructure, and military protection, the shotcrete application of UHPC (ultra-high performance concrete) mixed with steel fibers has become the mainstream choice in the fields of long-term support and structural repair due to its outstanding advantages such as ultra-high strength, excellent toughness, impermeability and corrosion resistance, freeze-thaw resistance, and impact resistance. However, UHPC slurry has high viscosity and relatively high weight, and the steel fibers are prone to clumping, pipe blockage, segregation during transport, large spray rebound, and uneven fiber distribution—common industry problems. Conventional general-purpose wet spraying equipment is unable to handle continuous and stable operation, easily leading to construction interruptions, insufficient spray layer strength, and serious material loss.

I. Addressing Industry Pain Points: Solving Multiple Challenges in UHPC + Steel Fiber Spraying Construction Ordinary wet spraying equipment generally suffers from numerous unavoidable shortcomings when constructing steel fiber UHPC: high slurry viscosity makes suction difficult and pipelines are prone to blockage; steel fibers are compressed, entangled, and clump together, resulting in a disordered fiber arrangement within the sprayed layer, significantly weakening the bending and cracking resistance of UHPC; intense pumping pulses cause severe material segregation, leading to inconsistent sprayed layer density and thickness; pressure mismatch results in a high rebound rate, causing significant waste of valuable UHPC raw materials; high-strength steel fibers continuously scour pipelines, material chambers, and nozzles, causing rapid wear of vulnerable parts and high maintenance costs; uneven mixing of the accelerator leads to excessively rapid surface setting and insufficient internal hydration, significantly reducing the durability of the support structure.

II. Exclusive Customized Core Technologies: Adapted to high-pressure, high-volume pumping systems for all working conditions of steel fiber UHPC spraying, overcoming the problem of pipe blockage in viscous slurry suction. The entire machine features an upgraded and reinforced S-tube valve pumping structure, increasing the cylinder volume and shortening the suction stroke to improve the suction efficiency of viscous UHPC slurry; the rated conveying pressure is appropriately increased to match the conveying resistance of high-viscosity materials, eliminating empty suction and pipe blockage; the cylinder clearance and sealing compression structure are optimized, with a four-point elastic compensation sealing design, significantly improving sealing performance, preventing slurry leakage and external discharge, while also reducing the cutting and wear of steel fibers on the sealing components, extending the service life of vulnerable parts. The pumping frequency has been finely calibrated, resulting in a smooth material flow output without violent pulses, effectively preventing steel fibers from being squeezed, entangled, or agglomerated in the pipes, ensuring uniform flow of steel fibers with the slurry, guaranteeing a neat and orderly fiber arrangement within the sprayed layer from the source, and fully leveraging the core role of steel fibers in bridging and preventing cracking. 2. Wear-resistant reinforced conveying pipeline and gradient flow channel design: The entire conveying pipeline is made of thickened wear-resistant alloy steel with a smooth, wear-reducing inner wall. It features a smooth, gradient bend structure, eliminating sharp right-angle bends and reducing the probability of steel fiber jamming. The pipeline diameter is scientifically matched to the steel fiber length and UHPC aggregate particle size, balancing smooth conveying with spray compaction. For long-term erosion and wear of the steel fibers, key bends and outlets are equipped with replaceable wear-resistant bushings for quick replacement after wear, significantly reducing subsequent maintenance costs and adapting to continuous all-weather construction operations.

3. Green and Safe Construction, Optimized Working Environment: Adopting a fully enclosed wet spraying operation mode, the entire process generates no dry material dust. The dust concentration at the construction site is far below the national environmental protection limits, effectively avoiding the health hazards of UHPC ultrafine powder and steel fiber dust to construction workers. Automated boom remote-controlled spraying is the primary method, keeping operators away from the spraying work surface and significantly reducing the risks of high-altitude operations. The entire machine meets national emission standards, satisfying the construction access requirements of coastal ecological protection zones, urban infrastructure, and other environmentally controlled areas. Qingdao Saintyol DAWIN Machinery has focused on the R&D and manufacturing of concrete conveying and spraying equipment for many years. It has its own modern production workshop, a complete set of precision machining equipment, and a material rheology testing laboratory. It can customize equipment parameters according to customer-specific UHPC ratios, steel fiber content, and construction conditions. Core hydraulic and power components are selected from leading brands in the industry and undergo rigorous full-load test runs before leaving the factory. A comprehensive after-sales service network is established nationwide, with engineers providing on-site installation, commissioning, operation training, and regular inspection and maintenance, responding to equipment operation and maintenance needs around the clock. It provides a complete integrated solution of equipment, technology, and after-sales service for UHPC steel fiber high-end spraying projects. With customized technology adapted to new building materials and precision equipment used to create long-lasting projects, Qingdao Saintyol DAWIN Machinery UHPC steel fiber special wet spraying trolley breaks through the performance limitations of traditional spraying equipment, making ultra-high performance concrete spraying construction smoother, more efficient, and more stable, helping domestic high-end infrastructure to steadily move towards durability, high quality, and green development.