Building Site Surveys
The construction industry has a certain character for being a harsh atmosphere in which brute force takes precedence over calculated thought; however this impression is far from appropriate. There is a huge amount of work that happens behind the scenes of the demolition and construction sector that is firmly grounded in the academic world.
One part of this unnoticed work is site surveying, or more precisely pre-demolition and post-demolition topographical surveying. This kind of work demands a good balance of specific technical know-how as well as experience of the industry and a natural intuition for the complexities of the job. This article explores the ins and outs of this work.
Topographical Surveys
A topographical survey is a study of the actual features of a particular plot of land. The aim of a topographical survey is to chart the naturally occurring and man-made traits of a particular landscape to a high degree of accuracy. Whilst topography itself may refer to the surface of any object, it is more commonly associated with the surface of the planet.
Topographical surveys can be carried out on a very broad range of environments, from open countryside to urban areas and across a variety of elevations and land surfaces. Surveys can be developed to take into account a great number of factors, such as ground variables or vegetation, and as such can be used for a multitude of tasks.
Common Applications for Topographical Surveys
Perhaps the most widely used, and most commonly recognised application for topographical surveys is cartography, or map making. Modern maps include a great deal of information about the landscape they relate to, including waterways, elevations and ground surface, all of which will have been obtained via a topographical survey. This information is also being made available online.
Topographical surveys also have a key role to play in the construction industry. When people or organisations are looking to build any kind of structure they will need to perform extensive surveys as part of the design phase of the project. These surveys are often an important part of any application for planning permission as well.
Surveys also play a key safety part in primary industries such as mining, or in other industrial sectors that interact with the land, such as demolition and infrastructure. Organisations in these fields will use surveys to plan their projects, but also to ensure that they can guarantee the safety of their staff on site.
Engineers as well as construction personnel use building demolition surveys for specific measurements of internal and exterior constructions.
Types of Survey
The arena of topography covers a large number of physical features so it is beneficial to determine what type of topographical survey is suitable for a particular scenario.
“Lie of the land” Surveys
These types of topographical surveys are designed to create a summary of the physical characteristics of any given plot of land. Although the information gathered by the survey will be extremely accurate, and may be very extensive, the purpose of these surveys is to give a site summary. They will often be the first type of topographical survey that is undertaken on a job.
These surveys will generally incorporate a boundary survey that sets out to determine the extent of the site and spotlight any particular restraints that are determined by the geography of the site. They may also include a level survey that will plot the elevation of the terrain and the numerous gradients that exist.
Building Surveys
Building surveys are more typically concerned with man-made constructions on a site, including the surveying of special apparatus and even infrastructure characteristics. This type of study is more commonly associated with the demolition industry because it can give a detailed plan of the building to be demolished. It can be used for other projects as well.
A building survey will probably include a measured survey, which entails creating a precise plan of the exterior and internal proportions of a structure. Depending on the requirements of the job, a measured survey might provide simple building “footprint” dimensions, or might produce a very detailed plan of the structure.
Content of a Topographical Site Survey
A survey of a demolition site will almost definitely include the details gathered by the types of boundary and building surveys described above. This information will be required so that the demolition company can plan a demolition that is both adequate and secure. More often than not these surveys will also be legally required.
Surveys will often include information about the utility services that are present on a site prior to any demolition or construction work takes place. This is an essential safety aspect because any unmonitored damage to pipes and cables carrying water, gas and electricity could be very dangerous. The information can also be used to plan new structures, based upon the existing availability of these ammenities.
Another aspect of the site survey will often be an inventory of resources on the site. This type of survey will be a quantity survey of the various sorts of materials that can be found on site, for example, tiles and masonry, concrete that can be utilised as hardcore or even timber. By getting an accurate audit of site materials the construction firm can more accurately determine the need to import building resources, or they can re-use the materials on a different project.
Practically all building projects require topographical demolition surveys now legislation and safety have become crucial requirements.
Importance of Site Surveys
Possibly the most significant reason to undertake a topographical site survey is to ensure the safety of the people who will be doing work on the site. The industrial sectors that most commonly call for site surveys are risky enough as it is without having to worry about the condition of the ground on which they are working.
Another critical reason to get a proper survey done is to highlight any potential difficulties that may arise because of the physical properties of the region. Particular things may not be evident on the surface of the site and will only be discovered once digging or demolition has started.
The inventory of site supplies, as previously stated, can be of great value to a demolition or construction company working on a project. Not only are building materials themselves costly, but transporting them to the site could be a very expensive task in itself. Any time that material can be recycled on site offers an opportunity to save development time and funds.
Topographical surveys can also highlight other areas that will be of use to the project planners. For example, if the gradients on a site would be prohibitive to certain vehicles or machinery then a new entry route or alternative equipment will need to be found.
Positioning of Survey Control
During the surveying and construction stages of a building project, the apparatus required for the physical surveying of the site and control of the survey data will often be stored on-site. This is obviously a problem when it comes to the demolition stage of a project since the equipment is both costly and sensitive.
Once the demolition has taken place and the site has been deemed safe for personnel to return to it, the surveying equipment can be restored to its original position on site. This will allow for efficient data collecting to take place for a post-demolition survey, and retains a single point of contact for anybody who needs the topographical survey information. Most surveying companies will oversee this redeployment.
One of the more technical areas of industrial demolition regards disposal of dangerous substances that may be harmful to the natural environment.
Who can Perform Site Surveys?
Because topographical site surveys can play such a vital role in the success or failure of a building or demolition project it is critical that they are undertaken carefully by the right people. There are different divisions of site surveying and each one will have unique certificates associated with it.
When selecting a company to undertake the surveying work required for your project it will be wise to choose a company with a good reputation and a proven track record. Ask to see examples of their previous work and try to get feedback about their performance on previous projects.
Who will use the Survey Information?
When an adequate level of details has been gathered by a site survey it needs to be handed out to the appropriate personnel on-site. Who gets which pieces of information will mostly depend on the job roles being performed, but can also rely on the stage that a project is at.
Project Planners
Project planners will usually require access to all of the information gathered by a topographical survey, though they will particularly need to use information about the physical relief of a site before the design phase, and a site materials inventory before they can plan the construction phase. The more data that can be made available to project planners will aid the smooth running of the project.
Demolition Experts
Demolition organisations will want to know about the interior and external properties of any building or structures that they are set to take down. Whilst every job will have different requirements, demolition experts will typically need to know about the fundamental structure of a building and the materials it is made out of. They will need this information before demolition can take place.
Site Engineers
Construction engineers on-site will be mainly interested in the survey data about the relief and topography of the site. It is usually the case that they will want to assemble on a flat surface, so they will use details about the natural lay of the land to calculate what work will be needed to create a steady footing for any building. They will want this information prior to and in the course of the construction stage of a job.