Monitoring Kristianstad’s central sewage treatment plant

Author: Frederick Somerville

In order for Kristianstad to be able to grow and meet the needs of the future, a major rebuilding and expansion of the municipality's central sewage treatment plant has to take place. In the ongoing foundation works, there are several challenges. One for example, is that most of the existing pipes and sewers in the plant is in very loose ground as the area was formerly a dried-up lake.

为了监视地面运动，测量咨询公司MätrixABperformed monitoring measurements with equipment from Leica Geosystems during the period when piles had to be driven into the ground.

距离克里斯蒂安斯塔德（Kristianstad）的治疗厂几百米处，瑞典的最低地点位于海平面2.32米处。“低水平意味着建筑工地的地面条件是瑞典最糟糕的情况之一，”测量顾问，MätrixAB的首席执行官兼创始人Evelina Nilsson说，位于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.

---

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.

After consulting with Frederick Somerville, Geomatics Technical Support at Leica Geosystems, a customised monitoring solution was created based on theLeica Nova MS50总站，四个Leica Viva GS14GNSS antennas that Mätrix already owned, a new Leica ComBox for data transmission and the softwareLeica Geomoswhich controls the measurements andLeica GeomosNow!分析数据。

另外，许多Leica Nivel 220倾斜的传感器安装在一些工作地点的周围建筑物上，以检查任何效果。Nivel 220是非常敏感的传感器，耐受性为0.0047 mm/m，如果发生了安装在上面的建筑物的倾向，则会给出很早的迹象。

“最初,我们以同样的方式在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.

“Thanks to the solution, we were able to meet the customer's requirements for accuracy and also get an automated daily report” she adds.

---

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.”

监测的数据测量were also of high quality and provided a lot of information.

伊维利娜说：“通过手动测量，我们能够测量所有点，但只能重复几次周期，而通过自动监测，我们每晚都能对同一点进行许多测量。”

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

“现在有了Geomos！，可以轻松地为参与该项目的每个人创建图形和报告，并用作进行良好分析的基础。这使我们能够提出改进的建议，而地理技术人员也可以在做出任何决定之前审查数据。”

---

为客户节省了成本

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.

节省成本的另一个例子是确保一条大型1200毫米线，就像颈动脉一样，将所有水从治疗厂的一部分运送到另一部分。

“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.”

---

Award-winning innovator and young measurement consulting company

Mätrix AG is a young company founded by Evelina Nilsson in 2014 when she was just 23 years old. Today, it has five employees and is in the process of recruiting two more. In 2020, Mätrix came in third nationally in the Young Entrepreneurs of the Year competition; organised by the trade association Företagarna.

该公司以高水平的知识，创新和一流的服务来介绍自己。Evelina年轻时从事服务贸易的工作，因此在她身上脱颖而出。

“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.

---

喜欢准确性

Mätrix主要从事与混凝土建筑生产和建设项目的测量分配；意思是住房，房地产，工业建筑和体育设施。

“We perform a lot of precision measurements and have niched ourselves towards assignments where accuracy is especially important and where a little extra thinking is needed. Personally, I think it's the most fun when it takes a little extra time to get everything right; it really satisfies my sense of order” says Evelina.

All measuring equipment that Mätrix uses comes from Leica Geosystems and they also have aCCP (Customer Care Packages)support agreement.

“我们选择从Leica Geosystems购买所有东西，这不仅是因为设备的质量最高，而且还因为它们保持了很高的服务水平。我认为他们有一种独特的个人方法，他们总是希望将自己的最大程度地献给我们作为客户，而不管是要找到新的解决方案，照顾支持事项还是复杂性，以在现场提供最快的帮助。”

---

您会继续监视测量吗？

“Monitoring measurement in Sweden is on the rise. Many believe that projects must be large for it to be useful but I see that there is great added value even in smaller projects” says Evelina. “It is clearly a service that we at Mätrix AB will want to develop further. It is a good complement in the field of control measurement and that is very exciting.”

---

Interested in monitoring? Please feel free to read further case studies, showing how our customers use our solution to improve their monitoring workflow:

Monitoring Case Studies