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Abstract: The hand-push high-pressure water road marking cleaning machine is a specialized device that utilizes ultra-high-pressure water jet technology to remove old road markings. Compared with traditional milling or chemical removal methods, this equipment offers significant advantages including no damage to the road surface, no dust pollution, and environmentally friendly high efficiency. It is widely used in urban road marking renovation, highway traffic diversion, and airport runway marking removal. This article provides a systematic introduction to the equipment from the aspects of working principle, technical features, construction parameters, and operational specifications.

I. Working Principle

The core principle of the hand-push high-pressure water road marking cleaning machine is the precise stripping of road markings using ultra-high-pressure water jets. The equipment pressurizes water to 800–2800 bar through a high-pressure pump, delivers it via a high-pressure hose to the rotary nozzle at the hand-push operating end, and the nozzle sprays high-speed water jets onto the road surface at a specific angle.

Unlike ordinary high-pressure cleaning, marking removal requires “surface stripping” rather than “deep cutting.” When the water jet contacts the marking coating, it generates a micro-explosion effect, causing fatigue cracks at the bonding interface between the coating layer and the road substrate, thereby completely stripping the marking. The angle between the nozzle and the road surface is typically controlled at 15°–25°, and the travel speed is controlled at 0.5–3 km/h, ensuring that only the marking coating is affected while the road aggregate is virtually untouched. Measured data shows that the change in road surface roughness after removal is less than 5%.

II. Technical Features and Advantages

Zero Damage to the Road Surface: The ultra-high-pressure water jet removes markings without causing cutting, abrasion, or micro-cracks to the asphalt or concrete substrate. The nozzle stops acting upon reaching the road surface, unlike the mechanical cutting of milling equipment.

Thorough Removal Without Residue: It can completely remove thermoplastic and cold-applied markings in one pass, leaving no “ghost line” traces. In contrast, mechanical grinding often leaves residual shadows due to operational variations.

Environmentally Friendly and Dust-Free: Water is used as the working medium, producing no dust and requiring no chemical solvents. The road surface is clean after operation and ready for immediate re-marking.

Flexible and Lightweight Operation: The hand-push operating end is compact and lightweight, easily reaching complex areas such as curves, intersections, and crosswalks, making up for the shortcomings of large vehicle-mounted equipment in detailed areas.

Ready for Immediate Re-Marking: After removal is completed, the road surface is immediately ready for re-marking, with no waiting or additional cleaning preparation required.

III. Operational Key Points and Safety Specifications

Pre-Operation Preparation: Confirm that the plunger pump oil level is normal, the high-pressure hose is free of wear, and a reliable water supply source is connected. Preset pressure parameters according to the marking type (thermoplastic, cold-applied, or two-component). It is recommended to conduct a 10–20 m trial section to verify the effect before formal operation.

Safety Precautions: High-pressure water jets have extremely strong cutting capability, and a safe man-machine distance must be maintained during operation. The hand-push cart should be equipped with a circular protective cover to prevent water jet rebound and flying debris. Operators are advised to wear cut-resistant protective clothing.

Quality Control: The removal effect is influenced by the interaction of three factors: pressure, travel speed, and nozzle-to-ground height. Insufficient pressure or excessive travel speed will result in residue, while excessive pressure or insufficient travel speed may cause over-flushing. It is recommended to adopt a pressure-speed linkage adjustment mechanism to maintain consistent removal quality.

IV. Application Scenarios

The hand-push high-pressure water road marking cleaning machine is suitable for urban road marking renovation, local removal in highway traffic diversion projects, pre-treatment before bridge deck waterproofing, airport runway marking removal, and marking renewal in parking lots and factory roads. For large municipal projects, hand-push equipment is usually used in conjunction with vehicle-mounted main units — the main unit provides ultra-high-pressure water supply and recovery systems, while the hand-push end handles fine operations, forming an efficient construction mode of “centralized energy supply, decentralized execution.”

As municipal maintenance continues to raise requirements for road surface protection and environmental friendliness, the hand-push high-pressure water road marking cleaning machine is gradually replacing traditional milling and chemical removal processes, becoming the mainstream choice for road marking maintenance.