Trailer-Mounted Falling Weight Deflectometer Falling Weight Deflectometer Test Apparatus Jt-Fwd-01 Road & Traffic Onsite Test Equipment

Trailor-Mounted Falling Weight Deflectometer

 

JT-FWD-01

SHRP-LTPP AASHTO R32 FWD;JTG 3450-2019;T0953-2008; JTT1125-2017;JJG133-2017

The Falling Weight Deflectometer (FWD for short) is a special equipment used to evaluate the bearing capacity of pavement. It starts the drop weight device through the computer-controlled hydraulic system, so that the drop weight of a certain mass falls freely from a certain height, and the impact force acts on the bearing plate and transmits it to the road surface, thereby imposing a pulse load on the road surface, resulting in instantaneous deformation of the road surface. Sensors at different distances from the measuring point detect the deformation of the surface of the structural layer, and the recording system transmits the signal to the computer, that is, the dynamic deflection and the deflection basin generated under the action of the dynamic load are measured.

Compared with the traditional Beckman beam measurement deflection, the drop-weight deflection is easy to use, fast, safe, labor-saving, simulates the actual situation to apply dynamic loads, and is suitable for long-distance and continuous measurement. After analysis and comparison, the US Federal Highway Administration confirmed that FWD is a better dynamic load assessment equipment for pavement bearing capacity, and selected FWD as an important equipment for pavement strength assessment in the implementation of SHRP plan.
 

Easy to set up test parameters, the number of deflection drop weights, the weight lift height and the impact load can be set before the test, which is converted by the built-in load height relationship
The data acquisition software can display the current deflection and load curve of each drop weight in real time; later, the data processing software can be used to view the load and deflection time history curve of the effective drop weight
Hydraulically controlled mechanical locking device for safe detection

1- Constructions & structure

-Falling weight system
The drop weight system is designed as an independent whole, which can flexibly adapt to various bearing chassis, including trailer chassis and vehicle chassis;
The transmission system consists of a hydraulic device, and the lifting and releasing of the mass block are completed by the hydraulic device;
Both sides of the bottom of the drop weight system are equipped with hydraulically controlled mechanical locking devices to ensure safe inspection.

-Vehicle chassis
Due to the modular design of the vehicle-mounted drop weight deflectometer, the system can be adapted to be installed on a variety of vehicle chassis (pickup trucks, vans, commercial vehicles, etc.). vehicle needs.

-Trailer chassis
 The load-carrying trailer of the trailer-type drop weight deflectometer adopts the chassis imported from Germany, and the structure is firm and stable.
 Adopt inertia mechanical braking system and rubber torsion bar independent suspension system, the braking is sensitive and reliable, and the driving is safe and stable
 Single-axis design, reducing turning radius, making U-turn more convenient
The ball hook is connected to the tractor, which is simple and reliable

-Deflection sensors and test beams
Fully automatic drop weight deflectometer can provide customers with test beam multi-point (standard 9 points) and single-point measurement options
The deflection sensor adopts imported high-precision geophone (Geophone), which is consistent with other imported deflection instruments
Number of deflection sensors 1~23 (optional)

2- Test software
-data acquisition software
-Chinese and English operating software, friendly interface, used to create data save files, close data save files, test parameter settings, distance calibration, view or modify sensor parameters, easy to set parameters and sequence, display deflection curve and load curve.

-Data analysis software
-Provided users with data processing software in Chinese, which is convenient for users to organize and analyze the test data and issue test reports.

3- Main functions
-Automatic import and export of collected data; data normalization;
-Statistics and calculation of single point distribution represent deflection;
-Calculate the Beckman beam conversion factor;
-Joint load transfer evaluation, plate void evaluation, and modulus inverse calculation.

 

 

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