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Case Study | PRIMAX 2500 Heavy Hammer Deflection Apparatus for Airport Bearing Capacity Testing
Release time: 2018-11-28

In pavement design and bearing capacity evaluation, the drop hammer deflector (referred to as FWD) is one of the most advanced pavement strength non-destructive testing equipment in the world. Its measurement results are accurate and the amount of information is large. Compared with the traditional Beckman beam measuring deflection, it has the characteristics of easy to use, fast, safe, saving manpower, and simulating the actual situation to apply dynamic loads .

Northwest Civil Aviation Airport Construction Co., Ltd. (hereinafter referred to as "Northwest Civil Aviation") was established in May 1995 and is affiliated to the Civil Aviation Northwest Regional Administration. Northwest Civil Aviation purchased the PRIMAX 2500 heavy-duty deflection instrument in 2016 and applied it to domestic and international airport construction projects.

Bandaranaike International Airport Project

Bandaranaike International Airport (BIA) is located about 30 kilometers from Colombo, Sri Lanka. BIA is Sri Lanka's main route for over 98% of international traffic in and out of the island. The PRIMAX 2500 heavy-duty deflection instrument purchased by Northwest Civil Aviation was successfully applied to the measurement of the runway deflection value of the airport to ensure the smooth completion and acceptance of the airport road surface bearing capacity test.

Equipment arrives locally for installation

Equipment used in the project site

Field data analysis software legend

On-site engineer on-site training

Other airport projects

In 2018, Northwest Civil Aviation's PRIMAX 2500 heavy- duty deflector was applied to the Zhuhai Jinwan International Airport project.

Project site of Zhuhai Jinwan International Airport


In addition, the PRIMAX 2500 heavy-duty deflector is also used in the projects undertaken by the Northwest Civil Aviation Airport Construction Co., Ltd. as follows:

  • Maldives Ibrahim Nasir International Airport Project

  • Civil Aviation School Flight Center South Base Project

  • Jiangsu Yangzhou Taizhou International Airport Project

  • Henan Xinyang Minggang Airport Project

  • Lanzhou Zhongchuan International Airport Project

  • Gansu Qingyang Xifeng Airport Project

  • Liaoning Chaoyang Airport Project

  • Liaoning Dandong Langtou International Airport Project

  • Shandong Weifang Nanyuan Airport Project

  • Guizhou Liping Airport Project

Introduction of PRIMAX 2500 Heavy-duty Deflection Instrument

PRIMAX 2500 heavy-duty deflector consists of trailer (including loading system and displacement sensor) and microcomputer control system (including control and data acquisition and processing part). Its working principle is: under the control of a computer, a weight of a certain weight is lifted from a hydraulic transmission device to a certain height and then falls freely. The impact force acts on the bearing plate and is transmitted to the road surface, thereby applying a pulse load to the road surface, resulting in the surface of the road surface Transient deformation occurs, and sensors distributed at different distances from the measuring point detect the deformation of the surface of the structural layer. The recording system transmits the signal to the computer to determine the dynamic deflection and deflection basin under dynamic load. The test data can be used to inversely calculate the modulus of each layer of the pavement structural layer, so as to scientifically evaluate the pavement bearing capacity, determine the weak bearing capacity area, and propose maintenance or maintenance recommendations.

Sweco's heavy-duty deflection instrument is particularly suitable for airport runway simulation tests. The dual-axle structure trailer is stable enough with a maximum weight of 350kN (adjustable), which can simulate large aircraft pairs such as Airbus A350 (single-wheel load above 310kN) The load of the airport runway can be tested and evaluated for the airport runway of the 4F level (the highest level); in addition to the road surface bearing capacity detection, when a T-beam, a camera and an additional deflection sensor are configured, the drop weight deflections The instrument can also be used to detect the ability of the joints between cement concrete runway plates to transfer loads. It is especially suitable for airport runway detection using a large number of cement concrete pavements. Sweco's RoSy airport runway analysis software can also calculate the pavement classification number (PCN) according to the requirements of the international airport industry, and inversely calculate the structural layer modulus.


For more information about the product, please feel free to contact us.

Hotline: 400-700-9998

Email: marketing@epc.com.hk

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