Monitoring Kristianstad’s central sewage treatment plant

Author: Frederick Somerville

为了使Kristianstad能够增长并满足未来的需求，必须进行市政中央污水处理厂的重大重建和扩展。在正在进行的基金会作品中，存在一些挑战。例如，其中一个是，由于该地区以前是干燥的湖泊，因此工厂中的大多数现有管道和下水道都非常松散。

To monitor ground movements, the measurement consulting companyMätrix ABperformed monitoring measurements with equipment from Leica Geosystems during the period when piles had to be driven into the ground.

A few hundred meters from the treatment plant in Kristianstad stands Sweden's lowest ground point at 2.32 meters below sea level. “The low level meant that ground conditions at the construction site are one of Sweden's worst”, says Evelina Nilsson, measurement consultant, CEO and founder of Mätrix AB, which is based in Svängsta.

Because the ground conditions are so poor, nearly 1,500 concrete piles had to be being piled into an area where pipes and piping infrastructure already exists. When such extensive piling is performed, careful checks are required as mass movement in the ground can cause shifts and settlements in the surrounding areas. This can be devastating, racking up large costs and damages.

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High quality in the result through monitoring

“When we received the measurement assignment, we evaluated a number of possible solutions for how the monitoring could be performed. We came to the conclusion that manual measurements would not give a sufficiently comprehensive result as compared to automated monitoring measurements because so many measurement points needed to be monitored continuously, at frequent intervals and for a relatively long period of time” Evelina explains.

在与Leica GeoSystems的Geomatics技术支持的Frederick Somerville咨询后，根据该系统创建了定制的监视解决方案Leica Nova MS50total station, fourLeica Viva GS14Mätrix已经拥有的GNSS天线，这是一种用于数据传输的新雷卡（Leica Combox）和软件Leica GeoMoS控制测量和Leica GeoMoS Now!to analyse the data.

In addition, a number ofLeica Nivel 220tilt sensors, were mounted on some of the worksite’s surrounding buildings to check for any effects. Being very sensitive sensors, with a tolerance of 0.0047 mm/m, the Nivel 220 gives very early indications if something is happening to the inclination of the buildings on which they are mounted.

“Initially, we measured in the same way around the clock, but when the piling work turned out to be causing too much disturbance in the total station measurements, we chose during the day to only use the tilt sensors. We set them up such that they sent across movement data every three minutes and the tilt sensors provided results and sounded alarms if something was happening outside the limit values” says Evelina.

她补充说：“多亏了解决方案，我们能够满足客户对准确性的要求，并获得自动化的每日报告。”

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What has been the result of monitoring?

“The measurements showed that there were movements in the ground but that they were manageable and not as large as was initially feared. If we had not performed these measurements however, no one would have known for sure and could only have made assumptions. Thanks to the measurements, it was possible for the piling to be carried out in a controlled manner, which also left everyone feeling secure and in control of the situation.”

监视测量结果产生的数据也高质量，并提供了很多信息。

“With manual measurement, we were able to measure all points but could only repeat the cycle a few times whereas with automated monitoring, we were able to make many measurements of the same points every night” says Evelina.

With the help of the GeoMoS Now! software, all captured data is visualised.

“With GeoMoS Now!, graphs and reports can be easily created for everyone involved in the project and used as the basis for a good analysis. This allowed us to come up with improvement proposals and the geo-technicians could also review the data before making any decisions.”

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Saved costs for the customer

A concrete and positive effect of the measurements was that the piling method projected from the beginning could be verified. There was an alternative, more expensive piling method that could have been applied if the ground moved a lot. Thanks to the automated monitoring results, this was avoided, thus preventing any increase in costs.

Another example of saved costs was the securing of a large 1200 mm line which, like a carotid artery, transports all the water from one part of the treatment plant to another.

“If there had been damage to the infrastructure due to a settlement, it would have been a disaster and the entire plant would have had to shut down. Now our measurements could follow the movements and show that that risk did not exist.”

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屡获殊荣的创新者和年轻测量咨询公司

MätrixAg是一家年轻的公司，由Evelina Nilsson于2014年成立，当时她只有23岁。今天，它有五名员工，正在招募另外两名员工。2020年，Mätrix在年轻的年轻企业家比赛中排名第三。由贸易协会Företagarna组织。

The company profiles itself with a high level of knowledge, innovation and first-class service. Evelina worked in the service trade during her youth and therefore has service mindedness ingrained in her.

“Customer service is very important and we constantly think about our customers' needs. We want to be innovative in a traditional industry and always strive to deliver services with the right quality, the right scope and at the right time. We have fun at work and work closely with each other, brainstorming solutions, ideas and constantly support each other when needed”, she says.

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Like the accuracy

Mätrix works mainly with measurement assignments in building production and construction projects with concrete; meaning housing, real estate, industrial buildings and sports facilities.

“我们进行了许多精确的测量，并使自己对精度特别重要且需要一些额外思考的任务感到不安。就我个人而言，我认为这是最有趣的，需要额外的时间才能使一切正确。这确实满足了我的秩序感。”伊夫琳娜说。

Mätrix使用的所有测量设备来自Leica Geosystems，它们也有一个CCP (Customer Care Packages)支持协议。

“We have chosen to buy everything from Leica Geosystems not only because the equipment is of the highest quality but also because they maintain a very high level of service. I think they have a unique personal approach and they always want to give their utmost to us as a customer, regardless of whether it is about finding new solutions, taking care of support matters or complexities to provide the fastest possible help on site.”

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Will you continue with monitoring measurement?

“瑞典的监测测量正在上升。许多人认为，项目必须很大才能有用，但我看到即使在较小的项目中也有巨大的价值。” Evelina说。“这显然是我们在MätrixAB希望进一步发展的服务。这是控制测量领域的一个很好的补充，这非常令人兴奋。”

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