Pavement Test Equipment Trailer-Mounted Falling Weight Deflectometer

• After-sales Service: Life Time
• Warranty: 12 Months Free
• Delivery Time: 10-20 Working Days
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: FWD-SN
• Application: Road Test
• PC Software: Yes
• Loading Mode: Hydraulic
• Transport Package: Wooden Tray
• Specification: JT-FWD-01
• Trademark: SEREV REAL
• Origin: China
• HS Code: 9031809090
• Production Capacity: 100set/Year
• Package Size: 100.00cm * 90.00cm * 45.00cm
• Package Gross Weight: 50.000kg

Product Description

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


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)

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.

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.
 

Technical 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	-50~100ºC
The temperature measurement accuracy should be	0.5%
Emergency lifting device	Equipped with manual hydraulic lifting device
Temperature resolution	0.1ºC
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