Things to know about explosive ordnance detection

Explosive ordnance detection is crucial for construction safety. This article looks at the risks, methods such as magnetics and INN technology and presents case studies of effective applications in practice. A must-read for construction professionals.
Explosive ordnance detection before earthworks
Things to know about explosive ordnance detection

Introduction to explosive ordnance detection

The Explosive ordnance sounding is an indispensable component of modern construction projects, especially in Germany, where historical Explosive ordnance still represent a major risk. During the Second World War, numerous bombs were dropped over urban and industrial areas. Many of these explosive devices are still hidden in the ground today and pose a latent danger. By explosive ordnance we mean a wide range of explosive objects, from rifle cartridges to Intercontinental missiles. This definition emphasises the need for a thorough explosive ordnance survey prior to any major construction project.

Basics of explosive ordnance detection

During construction projects, the risk of explosive ordnance can be activated by mechanical activities such as excavations or vibrations. Minimising this risk is crucial for the safety of construction workers and the public. Appropriate measures must therefore be taken to minimise the risk, both preventively and sustainably. An important decision in this process is the determination of the Probing depthwhich are either limited to the planned depths of intervention or cover the entire area. Bomb horizon can cover.

Measuring techniques in explosive ordnance detection

The Sensory anomaly measurement (SAV) forms the basis for explosive ordnance detection. Various physical methods are used here, of which the Magnetics is considered the standard method. It recognises magnetic anomalies in the ground. An alternative is the Pulsed neutron-neutron technology (INN technology) which emits neutrons into the soil to reveal differences in density. This technique is particularly effective in areas where other methods are limited by sources of interference such as metal in the soil.

Comparison of the methods: Magnetics vs. INN technology

The choice between magnetics and INN technology depends on the specific conditions of the construction site. While magnetics is sufficient in many cases, INN technology shows its strengths particularly in complex environments with strong Iron contamination or in the vicinity of buildings. A practical example is the comparison of the two techniques on an area of around 4,700 m², which was carried out by the Wayss & Freytag Ingenieurbau AG was carried out. This case clearly shows that INN technology can be an economical and time-saving alternative in certain scenarios.

Results and analyses

In the above example, the Borehole magnetics resulted in a high number of suspected points, most of which turned out to be irrelevant. In contrast, the INN technique was more efficient in identifying actual ordnance, significantly reducing the number of suspicious points. These results emphasise the efficiency and precision of the INN technique in distinguishing between ordnance and other metallic objects.

Selection of the appropriate procedure

For the optimum Explosive ordnance sounding the right choice of process is crucial. While magnetics is suitable for many standard applications, INN technology offers clear advantages, particularly in complex situations. Careful consideration of the respective advantages and disadvantages of both techniques is therefore essential. In many cases, a combination of both methods can be the most effective solution to comprehensively minimise the risk of explosive ordnance and at the same time work cost-effectively.

Realisation in practice

The practical realisation of the Explosive ordnance sounding requires careful planning and coordination. Before construction work begins, a Clearing concept The site plan must take into account the potential explosive ordnance, the associated risks, the planned land use and possible disruptive influences. The determination of Clearance target and Clearing depth and the selection of suitable exploratory measures and techniques are of central importance. It is particularly important that these aspects are contractually agreed between the client and the company carrying out the work in order to avoid disagreements later on.

Finally, it should be emphasised that the Explosive ordnance sounding is a highly complex but indispensable area in the construction industry. Choosing the right technology and understanding the associated challenges and opportunities is critical to the safety and efficiency of construction projects. Given the historical significance and potential risks posed by explosive ordnance, it is essential that construction projects begin with a comprehensive and professional explosive ordnance survey.

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