Detailed description:

HD-EVD Dynamic Deformation Modulus Tester Purpose:

The HD-EVD dynamic deformation modulus tester (handheld drop hammer deflectometer) is used to determine the deflection value (Evd) of the subgrade surface layer and transition section graded crushed stone under dynamic load, in order to evaluate the bearing capacity and deformation of the subgrade. Suitable for monitoring and testing the quality of foundation construction of railways, highways, airports, urban transportation, ports, docks, and industrial and civil buildings under dynamic loads, especially suitable for testing in narrow areas of the site, such as the transition section and shoulder of roads, bridges (culverts), existing line foundations, etc. It can quickly obtain the dynamic deformation modulus Evd and foundation coefficient K30. Dynamic testing is conducted to simulate the impact effect of high-speed train travel on the roadbed. Compared with static load testing, it can reflect the actual stress situation of the roadbed soil.

Application scope of HD-EVD dynamic deformation modulus tester:

The use of Evd dynamic deformation modulus tester (lightweight drop hammer tester) for dynamic plate load testing is mainly applied in earthwork engineering and traffic road construction. The Evd dynamic deformation modulus tester is used to measure the bearing capacity of soil, the compaction degree of soil and non bonded pavement base, and improve the quality of soil. This test method is applicable to coarse-grained soil and mixed granular soil with a particle size of 63mm. It is also applicable for measuring the dynamic deformation modulus Evd of soil, with a measurement range of Evd=15~70MN/m2 according to the standard.

Product features of HD-EVD dynamic deformation modulus tester:

1. Simulating the dynamic stress generated by high-speed trains on the roadbed through dynamic load testing can reflect the actual stress situation of the soil. The dynamic stress under its load plate is σ=0.1 Mpa, which is consistent with the dynamic stress of the soil designed for high-speed railways.

2. The testing speed is fast, and it only takes about 2 minutes to detect a single point. With the same number of inspections, the inspection time can be shortened without affecting the construction progress; Within the same detection time, the number of detections can be increased to make the test data representative; During construction, it is possible to track and detect issues at any time, promptly address them, and truly achieve quality monitoring during the construction process.

3. Easy to operate, highly automated, and significantly reduces labor intensity. Avoid misjudgments and errors caused by manual reading, recording, drawing, and calculation; Fully automatic data processing system, data LCD display and on-site printing output waveform and results, ensuring the accuracy and objectivity of test results.

4. Small size, light weight, easy to carry, and convenient for installation and disassembly. The total weight of the instrument shall not exceed 35kg, and the weight of a single piece shall not exceed 15kg, without the need for additional loading equipment; The transfer of instrument testing locations is fast and convenient.

5. Widely applicable. In addition to being applicable to the same range of soil types as K30, this testing instrument is also particularly suitable for detecting narrow and difficult sections of construction sites, such as the transition between roadbeds and bridges and culverts.

6. Especially suitable for monitoring and testing the foundation quality of railways, highways, airports, and industrial buildings under dynamic loads.

7. Environmentally friendly products. No nuclear radiation or waste gas pollution, beneficial for environmental protection and the physical health of testing personnel.

Technical parameters of HD-EVD dynamic deformation modulus tester:

Loading device

Total weight: 15.0kg

Hammer weight: 10.0kg

bigImpact force: 7.07kN

Impact duration: 18.0 ± 2.0ms

Material: Galvanized steel/Alloy steel

Load plate

Diameter: 300mm

Thickness: 20.0mm

Weight: 15.0kg

Material: Galvanized steel

Electronic subsidence measuring instrument

Subsidence test range: 0.1-2.0mm ± 0.02mm

Evd testing range: 10MPa~225MPa

Power supply: 4 x R6 batteries

Suitable temperature range: 0-50 ℃

Appearance dimensions: 210mm × 80mm × 25mm

Storage capacity: 200 sets of test curves

Aluminum instrument box size: 380 × 310 × 180mm

Weight: 0.4kg

Transport packaging box

Aluminum equipment box size: 1270mm × 410mm × 380mm

Net weight: 12kg