Model: JT-FWD-01

Standards

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

 

Introduction

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.

 

Features

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

 

Specifications

Braking device	Equipped with inertia brake
Traction device	Standard trailer coupler with 50mm trailer ball
Signaling device	With steering, braking, reversing, width display combination lamps
GPS function	With GPS module (can detect positioning)
Safety warning coating	Equipped with eye-catching safety warning reflective signs
Engineering lights	Equipped with engineering lights
Hammer lifting method	Hydraulic lifting hammer
Power supply	Tractor charging system provided
Deflection sensor range	-3500um~+3500um
Number of deflection sensors	Standard 9, 1-23 optional
Deflection test accuracy	better than 2%
Deflection resolution	0.1um
Deflection repeatability	The standard deviation of 40 test data at the same point is not more than 3μm
Maximum load	120/150kN (upgradeable to 300kN)
Load range	0~120/150kN
Load accuracy	1%
Load resolution	0.1kN or 1kPa
Temperature range	-50~100℃
The temperature measurement accuracy should be	0.5%
Emergency lifting device	Equipped with manual hydraulic lifting device
Temperature resolution	0.1℃
DMI measurement accuracy	1%
DMI resolution	0.1m
Front distance display	Real-time display of measuring point spacing
Test time per point	15~20s
Loading disk format	300mm diameter 4-point sector disc
Laptop	Windows7/XP operating system
Software function	Calculation with Beckman Beam Data Conversion System Automatically find the best conversion data Single point deflection distribution statistics Calculation and data export representing deflection data normalization Evaluation of load transfer ability of joints Evaluation of plate voids and analysis of stiffness composition Automatically record the position station of each test point Temperature correction possible
Walking speed	1~140Km/h
Safety locking mechanism	Equipped with safety locking mechanism
Bearing method	Carrier plate automatic locking mechanism

 

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