Track and Topographic Surveys
Murphy Surveys applies experience and technology to overcome challenges of railway line surveying such as time and access constraints. Our use of remote data capturing equipment, reduces costly line blockages and disruptions.
Static Laser Scanning or the Amberg Track Trolley System (GRP5000), captures a complete database of the area. If any additional data is required, this can be extracted from the point cloud at a later stage, cutting out any future need for expensive and inefficient site revisits.
Traditional track surveys can be carried out using a Total Station and Detail Pole. With the Amberg GRP1000 Track Trolley our expert surveyors can carry out the cant and gauge measurements, and track alignment surveys quickly and accurately. Details such as signals, welds and switches are recorded using a Rail Shoe or the Detail Pole as required. Platform edges are measured using a Bance gauge, as specified by Network Rail.
Underground Utility Surveys
Using Ground Penetrating Radar (GPR) we determine the exact position and depth of buried utilities along the lines or on other rail infrastructure property. This nonintrusive technique locates sub-surface utilities, rebar, conduits, voids and other features, both natural and manmade. GPR can be used on a variety of media including rock, soil, ice, fresh water, pavements and concrete structures. It is cost effective, fast, efficient and accurate; offering on site real time data with 3D imaging capabilities. Murphy Surveys was one of the first companies in the UK and Ireland to adopt GPR methods, and is therefore one of the most skilled and experienced.
Static or Dynamic Scanning Surveys
Static Laser Scanning can be carried out to obtain high accuracy positions of inaccessible structures and objects from a position of safety. Bridge structures or building facades can be surveyed from ground level so that a 2D or 3D drawing, wireframe or solid model can be produced to check the as-built position or used for design purposes. The laser scan data can be fed into a Building Information Model (BIM) to ensure clash-free construction occurs.
Dynamic Scanning using the Amberg GRP5000 system allows for profile information in relation to the track to be quickly and accurately captured. For clearance, the SCO files can be generated directly from the point cloud and exported using the Amberg Clearance Software Package. Height and stagger information can also be obtained directly from the point cloud information with the software automatically creating separate line strings for overhead line equipment which can then be easily exported.
Aerial LIDAR and GIS Surveys
For large areas or long sections of track, LIDAR (Light Detection and Ranging) Surveys can be carried out using a fixed wing drone or helicopter. Point cloud data along with vertical aerial and oblique imagery can be collected without any possession or line blockage requirements. We have developed an in-house Geographic Information System (GIS), which allows for the recorded information to be accessed quickly with the option of automated sections to be drawn instantly from any position along
the track which you may require.
Either manual or automated monitoring systems are used to check for movement within the ground or physical structures. The scale and duration of the project determines which type of system and methodology is used, and Murphy Surveys is experienced in both. We partner in a joint venture with GEODATA. The GEODATA group is an innovative supplier of integrated, IT-based solutions and services in the areas of tunnel surveying, geotechnical and structural monitoring. Murphy Surveys provides the manual monitoring solutions supplementing the automated systems and this has been phenomenally successful to date. High order robotic stations, precise digital levels, and precise measurement equipment such as inclinometers, tilt sensors, and electro level beams are just some of the resources we use to monitor movement.
We have expertise in a vast range of Engineering Surveys, including checking of line and level, setting out of gridlines, stations or any other spatial position, as well as obtaining any precise dimensions or positions. Where accuracy is paramount, we utilize high accuracy surveying equipment and ancillaries to ensure that we measure to the exacting standard of any engineering survey application.
Murphy Surveys has a dedicated Hydrographic Department to enable us to determine the position of any structural or bed positions below the water. We are adept at evaluating hydraulic models that could influence rail structures in – or crossing – rivers and streams.
Bathymetric surveys are carried out to monitor and define the extent of a scour hole, and are repeated at set-time intervals to monitor its development. The impact of external forces on the scour hole is also monitored, i.e. increased water velocity post flood or civil engineering works, high upstream water pressure and downstream scour. The survey extends outside the area of impact in both an upstream and downstream direction so that the information can be used to generate a hydrodynamic model. High resolution Sonar Scanning can be used to monitor structural integrity of bridges and docks. 3D models can be created to show what lies beneath the waterline.
Building Information Modelling (BIM)
We offer a wide range of survey deliverables from 2D or 3D topographic plans to Building Information Models (BIM) in Revit or Bentley Infrastructure; as well as Leica Tru-Views, point clouds, and animations to show the data for illustration purposes. BIM is a digital representation of the characteristics of a facility, created combining Laser Scanning with other technologies and processes. It is a single, accurate shared knowledge resource for reliable decision making throughout a project. It greatly improves collaboration, communication and workflows throughout construction projects.
Such are the savings and benefits of BIM that in 2011 the UK government implemented a five year staged plan to make it mandatory on public projects. Murphy Surveys has unrivalled BIM expertise, from accurate measuring to 3D modelling using our own inhouse system
Project Specific Surveys
Listed here is just a small selection of the surveys we offer. With over 28 varieties of survey and 30 years of experience, we can design and deliver a solution combining and integrating our surveys to meet your exact requirements efficiently and cost-effectively. With the most advanced equipment and our own exclusive data processing software, we tailor the survey deliverables to ensure you receive complete and accurate data on time.
Monitoring & Construction Surveying for Crossrail
Underground Utility Survey for the DART Underground Interconnector