Offer SHM System
The scope of our cooperation depends heavily on your expectations
SHM System is a secure and stable system for automated long-term observation and monitoring of engineering structures. We provide reliable solutions, sensors, data-loggers and components necessary for the construction of automated measuring systems. We organize presentations and training for subcontractors, design studios and engineering schools. We can only provide equipment and technology, without asking about their use, or to provide full support from system design and installation, to carrying out a comprehensive a commissioned study. Most frequently we work according to one of the following scenarios:
1. Design and implementation of the monitoring system in structures
In this case, we provide a comprehensive service, namely:
2. Supply of equipment and technology enabling building and maintenance of the system by the client
This option is designed for individuals, companies and institutions that have their own vision of a measurement system. They know what and how they want to measure and need only the components to run the system. In this case, SHM System supply:
3. Specialized training in the area of sensors installation and implementation of the SHM Monitor Measuring Platform
This part of our offer is addressed to installation companies, contractors, designers and people who want to use the vibrating wire technology and SHM Monitor, in their own projects.
Measurement systems provide input for the design. Because of the uncertainty, inevitable in the project, specifications required for the construction of geotechnical project may require the contractor to implement the above for the purpose of one or more tests for verification in the draft guidelines.
Ideally, trial tests are performed as part of the design phase and construction specifications may include test results, however often time restrictions or contractual conditions make such action impossible.
It is possible to plan and design the measurement system to collect data in both, preparation phase and construction work as well as during operation of the facility.
Measurements planned in this manner give the most benefit.
Measurement systems are installed most often for:
and also to reassure the public.
Often there is a need to monitor the impact of construction on the environment, such as measurements of ground deformation around a construction site, settlements and deformation of buildings, disturbance of groundwater levels. Properly conducted measurements also allow to confirm or reject the validity of the payment of any compensation
The use of a monitoring system allows the use of Observational Methods Design by Eurocode 7.
Engineers are obliged to build safe structures, particularly if lack of safety could result in loss of life or create health risks for the users. In the course operation, however, the structures age and remain under a continuous impact of the external factors and are subject to failure. All these factors call for the necessity for periodic inspection of the technical condition and safety of the structure
Unlike periodic tests and inspections, the continuous monitoring system of construction allows you to track selected structure parameters in real time. Conducting monitoring throughout the life of the structure, allows the observation of changes over time and trends. With the ability to complete the system with a devices for measuring environmental conditions, such as precipitation sensors, anemometers, temperature sensors, it is also possible to track the impact of these factors on the behavior of the monitored structure.
A properly designed measurement system:
Modern transport infrastructure and other linear engineering projects, are often built on land with high compressibility, since areas with favorable geological composition are already frequently utilized by other building structures and other location is impossible. This necessitates use of various geotechnical methods that would improve the soil and foundation. Starting with embankments, through various types of columns and piles. Achieving the effect of improving the soil under the embankment is related to its consolidation. This phenomenon involves the reduction of the volume of soil as a result of draining water and reducing (including organizing) the distance between the soil particles.
The natural variability of the soil causes that theoretically assumed settlements of improved ground and the minimum duration of the treatment may vary from actual observation of the behavior of the rock mass. Therefore, during the ground improvement procedure through the consolidation of the soil, it is advisable to carry out the monitoring of this process.
In addition to measuring changes in pore water pressure, the basic parameter describing the effect of improvements to the soil, is to measure its vertical and horizontal displacements. The measurement of vertical displacements can track the consolidation process at the time while the horizontal displacement measurement allows you to control the phenomenon of displacement of soil from the reinforced area. More often automated measurement systems are used for monitoring that allow observing the movement of soil, both during construction of the facility, as well as during its operation.
More and more often to measure vertical movements of land manual or automatic hydraulics profilometers are used. Hydraulic profilometers are devices in which the sensor measures hydrostatic fluid pressure changes caused by the change of the measured amount relative to the datum adopted. The measurement of vertical displacements of soil at selected points can be achieved also by means of extensometers or individual point’s hydraulic measurment.
The best known and most common method is the remote inclination measurement method. These measurements enable to determine both, the vertical and horizontal shifts in soil. This method is used both for manual measurements as well as designing automated measurement systems that track the process of consolidation.
Assumptions adopted for theoretical models in the design stage of bridges show only to a certain degree behavoiur of the during the operational stage of the structure. Phisical properties, the geometry of the structure and the interactions are only an attempt to describe the actual structure and behaviour.
One of the most promissing verification methods for behaviour of the way bridges is instalation of sensors on selected elements of the construction , performing continuous measurement of various (selected) physical quantity: from the deformation of these elements through determining the interaction – the possibilities are enormous.
Systems for monitoring the operation of bridges have beeen implemented worldwide for several years. In fact, all the important and large bridges are now equipped with various types of equipment, whose task is to conduct continuous measurement of the structures selected physical quantities. Most of this type of implementations are reported in Asia and the United States. In Poland, the monitoring systems designed evaluating the operational behaviour of structures are in their development stage, this is largely due to the fact that until recently we have not built large structures or custom designed features. However, in recent years several structures have been equipped with different types of monitoring systems: Solidarity Bridge in Płock, Sucharskiego Bridge in Gdansk, Bridge over the Vistula River in Pulawy, Wroclaw Rędziński Bridge and the Bridge on the Brda in Bydgoszcz.
Monitoring systems for bridges can be a very utilitarian in nature. Examples of such applications are bridges located in areas covered by mining damage. The task of the measuring device is to warn the manegment of excessive deformation of the structure when the phenomenon actually occurs. This avoids the need to reduce the speed of the rolling stock on the stretch since the beginning of mining operations. In such systems are equipped two bridges: the Ruda of Silesia and Pawłowice. Implementation for monitoring of trackbed and tracks are in the works. There is one aim – slowing down the movement of trains is a significant financial loss.
Coal mining, depending on the depth and the distance from the analyzed structure, leads to deformation of the ground surface and it is described by its strain (compressive and tensile strains), bending and subsidence. These events have a direct impact on the buildings located in areas effected by mining damage and may cause them to settle, tilt, and crack. Mining induced impact may vary in intensity depending on the construction of the object, the way integrity of structure or location in relation to the direction coal extraction site.
Installing the sensors within the area aims to assist in determining the progress of ground deformation over time. Obtaining this information is very important in view of reinforcement planning, traffic restrictions on linear engeneering projects or even the exclusion of structures or parts from operation.
Furnishing a structure with a monitoring system allows to determine the actual impact of mining and helps in the evaluation of the technical state of the structure. The system warns of excessive deformation of the structure when event occurs. This allows, for example, to avoid the necessity to reduce the speed of rolling stock due to the mere fact of commencement of mining operations, and consequently – to minimize financial losses resulting from the slowdown of the train.
Monitoring systems are also used in the case of dynamic forces caused also by the impact of paraseismic activity. In such cases it is possible to measure the impact of both the source as well as the response of the structure to the dynamic forces. For the second task vibration acceleration sensors and other sensors for measuring physical quantity change are used (e.g., strains, displacements, rotations) during interwals with the frequency of 100Hz.
Monitoring of geotechnical and hydrotechnical structures
Scope of services
SHM System ensures comprehensive support for the long-term geotechnical and hydrotechnical engineering. We provide professional and technical support at all stages of the project – from planning and designing through the selection of most suitable measuring instruments, installation, implementation, to overseeing the proper functioning of the system.
Description of the system
In contrast to the single periodic measurements, SHM System solutions enable to automate the measuring tasks at any length of time. While the data from a single measurement only describe the current state at the time of measurement, the monitoring system keeps track of the changes. Data from the installed measuring system are transfered to the remote data center of SHM System, where through the SHM Monitor Measuring Platform are made available to authorized users in the form of tables, graphs and reports. The person responsible for the data analysis can therefore access the information from any device with internet connection to obtain information about the results of the measurements, the status of the monitored structure and its response to the occurring impacts. SHM Monitor also provides a set of tools to manage the monitoring system – such as the authorization system, or alerts – warnings distributed to users via Text Messages or email, the preset situations.
Objectives of the system installation
In the case of geotechnical and hydraulic engineering structures, continuous monitoring systems are most often used to:
Basic values measured:
Measurements of environmental conditions:
Measurements of physical parameters:
Measurements of phenomena in structures:
Struktura, sposób działania oraz oferta firmy SHMsystem, są sumą doświadczeń całego zespołu, zdobytych przez lata pracy zawodowej, własnych prac badawczych, zrealizowanych systemów monitorowania, jak i wszystkich, współpracujących z nami firm. Niektóre z naszych prac będą prezentowane w dziale „Artykuły i aktualności”, w miarę ich ukazywania się w czasopismach.
Podstawowym celem tego wspólnego przedsięwzięcia, jest zapewnienie dostępu do niezawodnych narzędzi, umożliwiających zarówno prowadzenie długoterminowych, automatycznych pomiarów, budowy złożonych systemów monitorowania, jak i realizację niewielkich projektów badawczych w laboratoriach. Uznaliśmy, że czujniki, elektronika pomiarowa i oprogramowanie, to tylko narzędzia, potrzebne do rozwiązania konkretnych problemów inżynierskich i same w sobie nie są rzeczą najważniejszą. Najważniejszy jest cel, do realizacji którego, te wszystkie akcesoria nam służą.
Wychodząc z takiego założenia stworzyliśmy Platformę Pomiarową SHMmonitor. Jest to środowisko umożliwiające zbudowanie dowolnego systemu pomiarowego, przeznaczonego do monitorowania obiektów inżynierskich. Platforma Pomiarowa pośredniczy w komunikacji pomiędzy sprzętem – czujnikami, rejestratorami, a użytkownikiem. Wspiera cały proces pomiarowy i umożliwia jego automatyzację, od pozyskiwania danych, przez ich analizę, korektę, do prezentacji wyników i wysyłania informacji alarmowych.
Platforma SHMmonitor jest cały czas rozwijana, dlatego wszelkie uwagi na temat jej funkcjonowania są dla nas bardzo ważne. W regularnych okresach będziemy zwiększać możliwości Platformy o funkcje, wskazywane przez jej użytkowników. Należy jednak pamiętać, że Platforma Pomiarowa jest przeznaczona do budowy systemów monitorowania obiektów inżynierskich i nie jest jej celem konkurowanie z uniwersalnymi środowiskami programistyczno-pomiarowymi.
Platforma Pomiarowa jest środowiskiem otwartym. Możliwe jest dodawanie praktycznie dowolnych procedur obliczeniowych jak i nowych urządzeń współpracujących z Platformą. Firmy, osoby, które chcą wprowadzić własne procedury obliczeniowe lub dodać nowe urządzenia prosimy o kontakt. Zapraszamy do zapoznania się z naszą ofertą oraz możliwościami współpracy.
Pozostajemy do dyspozycji.
Components of measuring systems
SHM System provides all necessary elements for the construction and the reliable operation of a long-term measurement and monitoring systems. Although such systems are used by our customers most often to evaluate the technical condition of engineering structures, automation of geotechnical investigations, or recording the course of construction work, equals freedom of configuration and choice of components, allowing their application almost everywhere where there are values possible to measure with the available measurement apparatus.
Designing of the monitoring system of structure requires both knowledge of the phenomena that we want to observe and knowledge of the monitored structure, measuring devices and solutions that to be used. In most cases, this process requires the cooperation of the structure’s designer, measurement solutions provider and its future user. Our involvement strictly depends on your expectations – from the supply of equipment and technology, to the execution of and full technical and design support.
Sensors, measuring instruments, handles and housing
Upon client’s request we prepare and deliver all elements of measurement and mechanical measuring system. The SHM Monitor Platform and the recording devices offered by SHM System work with a full range of sensors used for building monitoring systems of engineering structures:
Very often In order to implement the system, it is necessary for a number of elements to be designed and built individually, for a specific project.
We manufacture and supply:
Recorders, dataloggers, and electronic measurement devices
We provide measurement -recording devices for both building measurement systems and for conducting of work as well as scientific research. The equipment offered by SHM System can operate as independent units for measurement, or it can be syncronized with the SHM Monitor Platform. The devices are equipped with power management features, which allow them to operate in areas with access to power supply or by using battery power.
SHM Monitor Measuring Platform
Measuring Platform allows you to build advanced measuring systems for continuous, automatic monitoring of engineering structures. It is a framework for the collection, storage, processing and presentation of measurement data via the Internet. Simply select and install the selected components, and the SHM Measuring Platform’s software will perform the processing and data visualization. SHM Monitoring Platform mediates the communication between the hardware – sensors, recorders, and the user. It supports the entire measuring process and enables its automation, from the data acquisition, through analysis and correction to the presentation of the results and sending of an alarm information and reports.
Capabilities of the SHM Monitor Measuring Platform
We conduct training in construction, installation and launching of measuring systems for installation companies. The following courses are also conducted in the form of presentations (1.5 h) for students at technical universities. Dates and details of training are tailored to specific needs.
1. Course in installation of vibrating wire deformation sensors (1-day)
The installation of sensors for continuous monitoring of structure. Training for installation companies. Practical training, each user learns how to mount sensors by gluing and fusion. Demonstration of assembly by welding.
Course Objective: acquisition of practical skills in installation of vibrating wire strain gages. The course consists of a theoretical and a practical part
In the theoretical part of the course, participants will learn operation principles of vibrating wire deformation sensors and methods of their installation. Become acquainted with the preparation of the surface for sensor installation and corrosion protection rules of installation. They will learn about the construction and operation of the equipment and instruments used for installation of the sensors. In the practical part of the course, participants will gain practical knowledge of sensor mounting, handling welding machines (welding based on model 4100), hand-held readers (based on the model GK-404) and the securing of installation against corrosion.
2. Course in construction of measuring systems by using SMH Monitor Monitoring Platform (2-day)
Construction of the measurement system on the SHM Monitor Measuring Platform is a training for those responsible for the conceptual creation of the systems, formulating and implementation of calculation models and launching of the systems based on SHM Monitor Measuring Platform. During the practical training, each user will compile and run small measuring system and configure the platform.
Course Objective: acquiring practical skills for planning and lounching of measuring systems on the SHM Monitor Measuring Platform. The course consists of theoretical and practical training..
In the theoretical part the participants will learn the construction of typical of measuring systems. Become familiar with the interface of the program and the possibilities of defining and adding measuring devices, converting the data collected and defining calculation models.
In the practical part, participants will build and configure their own measuring system. Configure the measuring equipment. Become familiar with the rules of entering the calculation formulas and thermal correction of the sensors. Configure the calculation model, and grant privileges to users of the system.
Crackmeter SHM X
Monitoring system of displacement of cracks and dilation joints
SHM X is a complete measuring system of displacement of cracks and dilation joints. Low cost of one measuring point, quick installation and good vandal and weather resistance – these are the main reasons why SHM X Crackmeter is choosen by experts and work managers to measure movement at joints and cracks of the structure.
Basic system features:
One crackmeter, three methods of measuring and analysing data
Low price and speed installation or the highest level of accuracy and detail? SHM X allowes simple matching the way of measuring analysing data to particular situation:
The installation procedure
SHM X Crackmeter is provided with a set of tools allowing quick and precise installation. Thanks to drilling jig marking optimal locations of measuring dowels takes just a few seconds. Template guarantees correct, perpendicular positioning of dowels.
SHM System has created the first distributed system on the market, which monitors in real-time the impact of vibration coming from construction works on surrounding buildings. Thanks to its modular design, the system can operate both as a long-term continuous vibration monitoring and as a portable measuring equipment using for one- or few-days expertise. The unique solution on the market is the ability to perform measurements simultaneously at many distant points. The portable system is particularly suitable for monitoring of short-term works or for optimizing technology which generates vibrations (e.g. the drop height of pile drivers, vibration frequency of vibro-hammers). The proposed solution allows for simultaneous observation of the influence of test-induced vibrations on objects localized at many different distances from the source of vibrations.
The system architecture provides very high scalability, both in the number of points in the monitored buildings and in the number of monitored objects. Also, the modular design allows the system application for short-term measurements – for example, for expertise purposes or evaluation the impact of applied technologies on the building surroundings. For short-term measurements, we guarantee the required equipment including its service and maintenance, installation on construction site and support with measurement data interpretation. There is a possibility of short- and long-term rental of the system.
The basic task of dynamic structural health monitoring system is to provide information, which let to evaluate the vibration impact on buildings, including i.e. Polish regulations of PN-85 / B-02170 and GSI GZWKW-2012, as well as to evaluate the vibration impact on people according to PN-88 / B-02171. The system automatically records the Vibration-Time waveforms and analyzes them with predefined algorithms. Results are compared with user-defined thresholds. Exceeding the alarm thresholds activates the alarm station and launches alerting procedure.
Signal analysis within 1/3-octave bands
The recorded Vibration-Time waveform is subjected to a preliminary analysis about filtering the signal and determining its duration. Then the maximum and root mean square (RMS) value within the one-third bands are determined according to National regulations – i.e.: PN-85 / B-02170, PN-88 / B-02171.
Signal analysis according to GSI-GZWKW-2012 scales
After initial filtration and determination of signal duration, the level of vibration intensity is calculated. The system can compare the calculated value with the following scales::
– GSI-GZWKW-V – scale based on the following parameters: amplitude of ground horizontal vibration velocity (PGVHmax) and its duration (tHV)
– GSI-GZWKW-A – scale based on the following parameter: amplitude of ground horizontal vibration acceleration within frequency band up to 10 Hz (PGAH10 ) and its duration (tHa), for buildings in good and bad technical condition.
Analysis defined by User
The simple way of defining computational models and user support during the system setup and startup allows for analysis according to any user algorithms.
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