MONITORING SURVEY

Level Monitoring

Using a level is the backbone of monitoring, it compares the change in level between two or more points and the technology has advanced to high-precision digital optical levels observing multiple measurements using a barcode and averaging the results. This combination can lead to repeatable sub-millimetre observations in the right conditions and has the benefit of recording multiple observations at once in a short space of time, without the degree of human error traditional levelling could include.

We use it to detect settlement, heave, or deformation in a variety of structures such as buildings, bridges, tunnels, embankments, and retaining walls by observing known points along/around a structure in comparison to a fixed datum. By doing so on a regular basis, after a period of base observations, we can help inform residents, construction teams, and site managers of any movement before it causes costly and timely problems.

Total Station Monitoring

A total station adds a third dimension of movement monitoring, incorporating recording vertical and horizontal positions across a network of determined points at key areas on and around the area being monitored. These monitoring instruments are more capable than a regular total station and are highly precise with advanced optical measurement systems capable of automated observations with exceptional accuracy. When combined with prisms they allow for multiple points to be observed with high levels of redundant observations and confidence to deliver consistent millimetre-level results with reduced potential for human error. As an alternative, they can be used with retro-reflective targets for manual observations to deliver a more cost-effective and temporary solution, but with a reduction in efficiency and accuracy and more human influence.

We use total station monitoring to detect lateral movement, rotation, settlement, or deformation in structures such as buildings, retaining walls, bridges, tunnels, and excavation sites. By repeatedly observing fixed prisms or retro-reflective targets in relation to a stable control network, we can identify subtle changes in position that may indicate developing issues. Similarly to level monitoring, doing this at frequent intervals means we’re able to report on changes before disruptive issues arise.

Remote Sensors

Real-time structural and environmental data can be captured using intelligent wireless IoT technology within a wide range of sensors, including displacement, rotation, temperature, strain, vibration, distance, and third-party geotechnical instruments. These systems create robust medium and long range networks capable of transmitting data through crowded areas to a central portal, allowing the sensors to operate reliably even in challenging construction or infrastructure environments. Providing continuous, automated measurements leads to advanced detection of movement, stress, or changing conditions long before they become critical. With mirrored sensor nodes, flexible network methods, and a seamless integration into cloud-based dashboards, this option offers a comprehensive and low-maintenance solution.

What are the processes involved in monitoring surveys?

• Quoting: following your enquiry, we’ll discuss your project requirements in detail, including the type of monitoring, duration, accuracy requirements, and any site-specific constraints. We may need to arrange a site visit to assess suitability of options and discuss the wider impact of the project. Our experienced team will guide you through the options, drawing on over 40 years of expertise in monitoring survey specifications,
• Initial site work: once commissioned, we schedule site work to suit your programme. This first visit typically involves establishing reliable control and reference points across the site, or mounting and calibrating sensors, followed by a series of rounds of base observations to test the repeatability,
• Processing: back in the office, we process the raw survey data to compute precise positions to include in the issued report and graphical representation of data. All outputs are checked via our ISO 9001 accredited Quality Assurance procedures to ensure accuracy and reliability,
• Repeat visits: at the agreed interval, we’ll return to site to take more observations and add this data to the growing report being issued,
• Movement detected: should observations provide results that exceed the set tolerance limits, we’ll be sure to flag these and work with you to either collect more data or install new positions to further investigate this. If you’ve opted for an automated monitoring system then this alerting will happen in real-time.