Correct operation process of concrete laser leveling machine

Correct operation of a concrete laser screed is key to ensuring construction quality, equipment safety, and extending its service life. Strictly adhere to the four-stage process of " Preparation → Commissioning → Operation → Finishing. " The following are detailed steps:
 

Pre-operation Preparation: Identify potential hazards and ensure equipment is in good condition.

1. Site and Environmental Inspection

Clean the work surface: Remove debris such as rebar, rocks, and wood chips from the site to prevent damage to the machine chassis and scraper blades. If the ground is wet or muddy, lay down steel plates or gravel to prevent the machine from getting stuck or the tires from slipping.
Confirm laser signal coverage: Check the work area for obstacles (such as scaffolding or walls) that could block the laser signal. Ensure there is no obstruction between the laser transmitter and receiver to prevent signal interruption and leveling errors.
Safety precautions: Post warning signs (such as "Construction in Progress" and "Do Not Enter") around the work area to prevent non-operating personnel from entering. Operators must wear hard hats, non-slip shoes, and reflective clothing.

2. Equipment Condition Inspection

Visual Inspection of Core Components:

Structural Inspection: Check the vibrating plate and scraper for deformation or cracks, and check whether the connecting bolts (such as the vibrating frame fixing bolts) are loose. If any abnormalities are found, shut down the machine for repair.
Pipe and Line Inspection: Check the hydraulic lines and connectors for leaks, check the wires for aging or damage, and check whether the laser receiver lens is clean and free of scratches.

Fluid and Consumable Inspection:

Fluids: Check the engine oil, hydraulic oil, and coolant levels to ensure they are within the normal range (inadequate engine oil may cause engine seizure, and insufficient hydraulic oil may cause pump wear).
Fuel: Add fuel of the correct grade (according to the engine manual, usually 0# diesel). Avoid using fuel with excessive impurities that could clog the filter element.
Condition of Consumable Parts: Check tire pressure (wheeled equipment) or track tightness (crawler equipment). Replace any severely worn scraper or vibrating plate wear strips.

Equipment Commissioning: Accurately Set Parameters to Ensure Laser System Stability

1. Laser System Deployment and Calibration

Install the Laser Transmitter: Secure the laser transmitter on a tripod and place it near the work area (3-10 meters from the equipment to avoid vibration interference). Level the tripod so that the transmitter is level (use the transmitter's built-in level to confirm).
Set the Laser Elevation: Adjust the height of the laser transmitter according to the concrete elevation specified in the construction drawings, ensuring that the laser plane aligns with the designed elevation (a tape measure can be used as an aid).
Calibrating Receiver Sensitivity: Mount the laser receiver on the leveling machine's pole. After powering on the receiver, check that it is receiving the laser signal properly (a solid green light indicates normal operation; a flashing or red light indicates an abnormal signal). If the signal is unstable, reposition the transmitter or clean dust from the lens.

2. Equipment Parameter Adjustment

Vibration Frequency Setting: Adjust the vibration frequency based on the concrete slump (usually between 3,000 and 6,000 vibrations per minute). For low slumps (dry, hard concrete), increase the frequency to enhance compaction; for high slumps, reduce the frequency to prevent concrete segregation.
Travel Speed Adjustment: Set the travel speed based on the concrete pour thickness (usually 5-30 cm). For thicker concrete, slow down the speed (recommended 0.5-1 m/min) to ensure adequate vibration. For thinner concrete, increase the speed appropriately (1-2 m/min).
Scraper Height Calibration: Use the equipment's operating lever to adjust the initial scraper height slightly above the laser mark (allowing for vibration sinkage). Before the first operation, test the speed at a corner to confirm the appropriate height.

Operation During Operation: Standardized Operation and Real-Time Monitoring

1. Starting and Preheating the Engine

Starting the Engine: Insert the key and power on the machine for a self-test (wait 3-5 seconds to confirm there are no fault warning lights on the instrument panel). Then, start the engine at idle speed. Avoid sudden acceleration during a cold start.
Preheating the Equipment: After starting the engine, let it idle for 3-5 minutes. Observe the hydraulic system pressure (normal range: 15-25 MPa) and the water temperature gauge (operate only when the water temperature rises above 50°C at idle). Ensure there are no abnormal noises or oil leaks.

2. Leveling Operation Procedure

Starting Operation: Shift the machine's travel gear to "Forward" and slowly push the travel joystick to smoothly enter the concrete area. Avoid sudden acceleration, which could cause the scraper to push against the concrete and create accumulations.
Vibrating and Leveling: After the machine enters the concrete, turn on the vibration switch. The scraper height is automatically adjusted based on the feedback signal from the laser receiver. (When the receiver senses the laser signal, the hydraulic system drives the scraper up and down to ensure the concrete surface is aligned with the laser elevation.) During operation, maintain a straight line, with adjacent work surfaces overlapping by 5-10 cm to avoid vibration leakage. Manual leveling (using a scraper or vibrator) is required when encountering laser signal blind spots such as corners and column bases.
Observe the concrete condition in real time: If honeycombing or roughness is observed on the surface, this may indicate insufficient vibration frequency or excessive travel speed, requiring prompt adjustment. If excessive water seepage occurs, pause operations and wait for the water to evaporate before resuming.

Turning and reversing: When turning or exiting the work area, first turn off the vibration switch, slow down, and steer smoothly to avoid sudden turns in the concrete that could cause sanding. When reversing, ensure there are no obstacles behind you. Obtain guidance from a designated operator if necessary.

Key Monitoring Points During Operation

Listen: Monitor the engine, hydraulic pump, and vibrator motor for any unusual noises (such as metallic friction or high-frequency squealing). Immediately stop and inspect any abnormal noises.
Observe: Check the instrument panel for normal pressure and temperature (hydraulic oil temperature should not exceed 80°C, engine water temperature should not exceed 95°C), the stability of the laser receiver signal, and any oil or fluid leaks.

Measurement: Use a ruler to check the flatness of the concrete surface every 10-20 meters (the error should be ≤3mm/2m). If any deviation is found, calibrate the laser system or scraper height in time.

Finish after work: Cleaning and maintaining, standardized storage

1. Shutdown operation

After the operation is completed, first turn off the vibration switch, drive the equipment to a solid ground outside the concrete area, run at idle for 3-5 minutes (let the engine and hydraulic system cool down), and then turn off the engine.
Disconnect the laser transmitter power supply, disassemble the transmitter and receiver and store them properly (avoid collisions and moisture).

2. Equipment cleaning and maintenance

Remove residual concrete: Use a high-pressure water gun or a shovel to clean the residual concrete on the fuselage, vibrating plate, and scraper (focus on cleaning the gaps on the bottom of the scraper and vibrating plate to prevent the concrete from solidifying and affecting the next operation), clean the surface moisture and avoid rust.
Core component maintenance: Add grease to rotating parts such as vibrating bearings, walking motor gearboxes, etc. (according to the model specified in the instruction manual, such as lithium-based grease).
Check whether the hydraulic pipeline joints are loose, and replace the seals in time if there is leakage; clean the dust on the surface of the air filter element (the replacement cycle needs to be shortened in dusty environments).
Site Cleanup: Retrieve the laser transmitter tripod and warning signs, clean the work surface and tools, and ensure the site is clean.

3. Equipment Storage

Short-term Storage (for same-day completion): Park the equipment on a flat, dry surface, apply the parking brake, and place wooden planks under the tires to prevent moisture. Store the laser components separately in the tool box.
Long-term Storage (over 3 days): Check the fuel level in the tank (it is recommended to fill it up to reduce rust on the inner wall), turn off the main power, spray rust inhibitor on exposed metal parts, and cover with a tarp to protect from sunlight and rain.
 

Operating Taboos and Precautions

Do not use the vibration function on non-concrete surfaces (such as hardened floors or steel plates) to avoid damage to the vibration bearings and scrapers.
Prohibit Overloading: Do not exceed the equipment's maximum leveling thickness (generally ≤30 cm) or climbing angle (≤15°) to prevent overloading the hydraulic system.
Do not force operation when the laser signal is interrupted. Stop the machine to troubleshoot signal issues (such as cleaning the lens or adjusting the transmitter position) to avoid height differences. Do not add fuel or check the engine oil while the engine is running to avoid fire or burns; the system pressure must be released before repairing the hydraulic system to prevent oil from spraying and injuring people.

Summary: The key to proper operation of a concrete laser screed is thorough preparation, precise control during operation, and standardized maintenance afterward. Strictly following these procedures not only ensures laser-grade surface flatness but also reduces equipment failures, extends service life, and reduces construction costs. Operators must undergo professional training and pass a professional assessment before taking up their duties. Unlicensed operation or illegal operations are strictly prohibited.