Auscultación Base grúa – en obra Estación Whitechapel

Challenge

BBMV – Balfour Beatty, Morgan Sindall, VINCI Construction – were awarded the Whitechapel main station contract which is part of the Crossrail project, the largest infrastructure scheme in Europe. As part of the tunnelling construction works at the new Whitechapel station, which is being built for the Elizabeth line, the cutting ran directly underneath two tower cranes. Tower crane TC1 was at track level between the platforms on the Whitechapel Underground station. This was approximately 5m below ground level. Tower crane TC2’s base was at ground level. Both cranes were erected in June 2014.

BBMV wanted to monitor the crane bases throughout the project in order to detect any movement without compromising safety, as this was an extremely busy construction site.

After a successful procurement process, Senceive were selected to come on board to monitor the two tower crane bases using their high precision FlatMesh™ tilt sensor nodes.

Solution

Monitoring was required for a duration of at least 18 months starting mid-July 2014. On each crane a node was attached to the concrete base and another was attached using Senceive’s patented magnetic mountings on the crane uprights.

The FlatMesh™ tilt sensors were an ideal choice, as they are completely wire and mains power free, eliminating the trip hazard of trailing cables. The data was transmitted via two solar powered gateways and remotely viewable by registered users through Senceive’s WebMonitor visualisation software 24 hours a day. This enabled the highly accurate and reliable data to be displayed clearly on a computer, tablet or smart phone anywhere in the world.

Outcome

The FlatMesh™ tilt sensor nodes were installed quickly and easily and remained in place without issue or failure for 32 months with no replacement or maintenance required. The long battery life gave the system the flexibility to remain installed well past the original planned monitoring period.

Senceive’s systems are continuing to deliver highly stable, reliable and high-quality data and we are proud to be part of one of Europe’s largest infrastructure project.

julio 1, 2020

monitorización geotécnica en excavación

EL RETO

La zona del Parque das Naçoes de Lisboa es producto de la transformación de una antigua zona industrial en el nuevo y cosmopolita distrito de negocios, servicios y ocio. EXEO Office Campus, viene a completar la oferta de oficinas.

El área en la que se implantarán los edificios está en proceso de excavación, y se sitúa junto a la emblemática estación de Oriente, estando rodeada por túneles y vías férreas. Es por ello que se hace imprescindible conocer en todo momento la estabilidad de la zona.

JETsj – Geotecnia Lda, conocida por su capacidad de innovación, decide dar un paso adelante e incorporar el sistema SENCEIVE de monitoreo sin cables, para recopilar todos los datos de la instrumentación de geotécnia.

El sistema debe ser comandado de forma remota y desde una plataforma única.

LA SOLUCIÓN

En una primera fase se han instalado 5 Inclinómetros IPI de 16m de profundidad, con 32 sensores por unidad, sumando un total de 160 unidades. Cada IPI se ha conectado a un Edge Hub, encargado de transmitir los datos de forma autónoma y sin cables. De esta forma se detectará cualquier corrimiento interno del terreno.
Junto a cada IPI se han instalado 3 piezómetros, sumando un total de 15 unidades, conectadas a nodos de cuerda vibrante de 4 canales.
En una segunda fase se instalarán cuatro células de carga y cuatro clinómetros triaxiales. Todos ellos trabajando unidos a la misma red de comunicaciones FlatMesh.

Los nodos funcionan de manera autónoma, mediante una batería interna con autonomía hasta 15 años. La transmisión de datos es sin cables, por método propio Senceive FlatMesh. Los datos, son transmitidos por un módem, a un servidor, para su visualización con el visor WebMonitor.

EL RESULTADO

En todo momento conocemos el comportamiento del terreno, lanzando avisos si llegado el caso nos acercáramos a valores preestablecidos, de forma remota, especialmente interesante durante el reciente periodo de confinamiento por el Covid-19.
El hecho de trabajar sin cables y de forma remota contribuye a economizar en tiempo de campo, y minimizar posibles accidentes, que nos dejaran sin datos.

 

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junio 29, 2020

Monitorización de Deformaciones – Túnel Rotherhithe

Challenge

The Thames Tideway Tunnel will provide capture, storage and movement of almost all the sewage and rainwater discharges that currently overflow into the river Thames from central London. The Rotherhithe Tunnel sits in close proximity to the Tideway East shaft site.

CVB (Costain, VINCI Construction Grands Projets and Bachy Soletanche), along with Sixense as their appointed monitoring contractor, required a monitoring system 12 months ahead of impacting works, to provide a sufficient period of baseline monitoring and continuing until any movements associated with the works have ceased.

Access was only allowed during night-time engineering closures that took take place once per week. Another challenge was that the majority of the tunnel lining is tiled and is very delicate and as such, TfL were reluctant to allow fixings into it. Every two weeks a machine, which combines a spinning brush and high pressure hot water jet, runs through the tunnel in order to clean this tunnel lining. Therefore, any system had to be robust enough to survive the twice monthly tunnel cleaning.

Solution

Senceive provided their wireless FlatMesh™ system as a monitoring solution. 74 high precision tilt sensor nodes were installed by Sixense during engineering closures over an 8 week period to monitor any convergence/ divergence during the works.

64 of the nodes were installed directly onto the tunnel lining in 16 arrays of 4 nodes per array. A further 10 nodes were mounted on 3m beams in a vertical shaft. The FlatMesh™ system allowed all the nodes to communicate with each other and measure sub-mm movements for an estimated project duration of 3-5 years.

The data is received by two wall-mounted 3G gateways, positioned and powered at the base and top access chamber of Shaft 3 with the data being relayed and transmitted via an antenna at the top of this shaft. This secure data was then easily sent through the mobile GSM network and accessed by registered users of the Senceive WebMonitor data visualisation software and the client’s own software. The nodes could also be remotely configured to provide near real-time data frequency if required.

Solution

Senceive provided their wireless FlatMesh™ system as a monitoring solution. 74 high precision tilt sensor nodes were installed by Sixense during engineering closures over an 8 week period to monitor any convergence/ divergence during the works.

64 of the nodes were installed directly onto the tunnel lining in 16 arrays of 4 nodes per array. A further 10 nodes were mounted on 3m beams in a vertical shaft. The FlatMesh™ system allowed all the nodes to communicate with each other and measure sub-mm movements for an estimated project duration of 3-5 years.

The data is received by two wall-mounted 3G gateways, positioned and powered at the base and top access chamber of Shaft 3 with the data being relayed and transmitted via an antenna at the top of this shaft. This secure data was then easily sent through the mobile GSM network and accessed by registered users of the Senceive WebMonitor data visualisation software and the client’s own software. The nodes could also be remotely configured to provide near real-time data frequency if required.

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junio 29, 2020

Monitorización Dinámica – Parque Eólico Marítimo, Blyth

Challenge

The Blyth Offshore Demonstrator Project is an ambitious project delivered by EDF Energy Renewables, showcasing groundbreaking and experimental construction techniques. It consists of 5 wind turbines with a combined generation capacity of 41.5MW, enough low carbon energy to power 34,000 homes, whilst cutting annual CO2 emissions by 57,600 tonnes.

The turbines make use of a concrete Gravity Based Foundation (GBF) for support, which were constructed by BAM using a technique called Float & Submerge, where they were constructed on land, floated down a river and submerged to the sea floor.

BAM performed inclination tests to define the exact centre of buoyancy for the GBFs to confirm the stability during tow and installation. A reliable inclination system was needed to demonstrate that they were as stable as the design had predicted they would be during the towing and final submersion. Based upon other successful deployments for BAM, and a reputation for being world leaders in wireless remote condition monitoring, Senceive was asked to provide a solution.

Solution

Two high precision triaxial tilt nodes were positioned around steel platforms on top of each of the GBF’s steel shafted masts, complete with waterproof straight antennae. Senceive’s patented magnetic mounting system allowed the tilt nodes to be quickly installed in any orientation, with each unit having a magnetic pull force of 100Kgs. The BAM team responsible for monitoring the GBFs asked for the two triaxial tilt nodes to be installed at a right angle to each other, which served two purposes: To provide redundancy in the unlikely event of failure or node disturbance and corroboration of the readings.

The nodes were all set to an initial reporting rate of 1 minute for the dry dock testing period (increased to 1 second later on) and trigger levels were preset to alert users via SMS text message. Data was then relayed through each mast’s own Solar 3G Gateway and wirelessly communicated through the FlatMesh network to the Senceive WebMonitor visualisation software, which can be accessed by registered users on any tablet, smart phone or computer worldwide.

Outcome

BAM needed to demonstrate that the built GBFs were as stable as the design had predicted it would be during the towing and final submersion, so monitoring was extended a further month and BAM also requested that the reporting rate be increased to a real-time level of 1 Hz.

The innovative Float & Submerge method used proved highly successful with the only movement shown in the dynamic data being that of the tides. The system had the advantage of swift easy installation and proved its reputation for robustness and reliability in harsh and challenging environments.

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junio 29, 2020

Load Monitoring of Struts: RCM

Challenge

June 2018 marked the start of an exciting redevelopment of the prestigious Royal College of Music (RCM) campus, which was first opened in 1882. The large courtyard will be dug out and a new basement and building is planned to go in its place.

Due to the total mass of the building and the depth required to excavate a basement, substantial shoring equipment was required to protect the existing building and ensure the safety of site workers from potential collapse.

Groundforce Shorco’s, one of the world’s leading supplier of trenching and shoring equipment, provided their MP150 and MP250 hydraulic struts which weighed five tonnes. The two MP150 struts and one MP250 strut had load pins which required monitoring to ensure that the correct hydraulic force was exerted to counter balance the pressure from the surrounding soil.

Solution

Senceive provided three wireless Millivolt per Volt nodes, which allowed Load Sensors to be integrated into the FlatMesh™ platform. These, now wireless, sensors measure the pressure exerted on the struts’ load pins during building works.

Data from the nodes is received by a solar 3G gateway, which was mounted on a crane using standard Jubilee clips. The wireless nodes were mounted using our patented magnetic mounts in a matter of minutes.

Image courtesy of Groundforce Shorco

Outcome

A wireless solution was ideal, as it reduced the amount of installation time, which in turn reduces risk and increases safety of both the installer and to the site workers, by giving Groundforce the ability to adjust the hydraulic pumps reactively to a situation. Reporting rates and SMS text alerts could all be remotely adjusted.

The flexibility of the FlatMesh™ system also allow the Millivolt per Volt nodes to be quickly decommissioned and redeployed at a moment’s notice to any of the struts located on site.

“It is always satisfying to know that time and money is being invested in the right product, and even more satisfying to know that it is being supplied and supported by the right people” – Paul McIntosh, Project Team Leader, Groundforce Shorco

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junio 29, 2020

Monitoring de superestructura Ferroviaria – Norwich

Challenge

Balfour Beatty on behalf of their client, Norfolk County Council, were contracted to construct £147 million, 20km of dual carriageway called the Norwich Northern Distributor Road (NNDR). This route went very close to Norwich International Airport and joined the Fakenham Road/A1067, north west of Norwich.

As part of the carriageway construction a large structure at Rackheath had to span Network Rail’s line regularly carrying passenger and freight trains between Norwich and Cromer. Due to the close proximity of the construction works to the rail, it was deemed necessary to carry out monitoring of the track bed to ensure no deformation was taking place.

Based upon several successful deployments elsewhere for Balfour Beatty and a pedigree in monitoring many other track bed environments for Network Rail, Senceive were approached to provide their high precision wireless tilt sensors as a monitoring solution. The project started January 2016 and is expected to complete April 2018.

Solution

Senceive proposed monitoring the two rail tracks using 106 wireless triaxial tilt nodes split equally between both the UP line, where sleepers were made from steel, and DOWN line, where the sleepers are mostly made from wood with a few being concrete. The nodes were installed using sacrificial track bed mounting plates on the area of the sleeper immediately off the ballast shoulder, known as the cess, to measure cant and twist of the track bed.

The flat terrain provided ideal conditions for the FlatMesh™ system and data from the wireless mesh network was easily transmitted to two solar 3G gateways. The gateways then used the mobile GSM network to transmit data to a secure cloud server, which could then be viewed by registered users of Senceive’s WebMonitor software.

Movements were detected very early on during monitoring and triggered SMS messages at certain alert levels, which were preconfigured by the customer.

Outcome

The small movements of ±1mm for the UP line and ±5mm for the DOWN line seemed to be fairly regular and were quickly investigated by Senceive’s dedicated customer service and technical team. We worked closely with Balfour Beatty to determine the cause and through careful analysis and site testing, it was proposed that the highly sensitive triaxial tilt nodes were detecting diurnal movement linked to temperature, which varied between the sleeper’s material composition.

It was possible to remove diurnal movement by applying a 24 hour rolling median to the raw displacement data. Therefore, all subsequent movements were easily attributed to rural terrain impacting the stability of the ballast when the occasional train passed by.

 

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junio 23, 2020

Monitorització de via: Igualada

CLIENT: FGC – FERROCARRILS DE LA GENERALITAT DE CATALUNYA / INFRATec

EL REPTE

FGC – Ferrocarrils de la Generalitat de Catalunya volia modelar el comportament de via en una zona particular de la línia Llobregat – Anoia

Es tracta d’una corba estricta de 105m de radi i 300m de longitud. Interessava conèixer en detall el comportament de la via en el període d’estiu, quan les temperatures arriben a valors més alts.

En concret calia conèixer el desplaçament i tensió dels carrils, així com la temperatura ambient i de carril.

Calia un sistema de fàcil muntatge i desmuntatge, doncs el període previst de treball era de només tres mesos.

El grup de sensors de desplaçament s’haurien de muntar en una zona estable externa, mentre que la resta de sensors anirien sobre les pròpies vies i travesses.

LA SOLUCIÓ

Senceive va proveir el sistema de monitorització que constava de 14 nodes, combinats amb sensors clinòmetre triaxial, distanciòmetre i temperatura, tots ells d’alta resolució.
S’instal·len als pals de catenària amb suports flexibles i regulables, per aconseguir una instal·lació estable, ràpida i de fàcil recuperació.
Addicionalment s’instal·len dos nodes de temperatura, i 4 sensors de tensió, tots aquests sobre el carril directament amb els corresponents nodes sobre les travesses, fixats amb adhesiu.
I finalment s’instil·la un mòdem alimentat amb un panell solar, també sobre un pilar de catenària.

Sensors i nodes funcionen de manera autònoma, amb una bateria interna de durada fins a 15 anys, i transmissió de dades sense cables, per mètode propi Senceive. Les dades, recollides cada 30’, un cop rebudes al mòdem, són difoses al núvol, per a la seva visualització al visor WebMonitor.

EL RESULTAT

El sistema es va instal·lar de manera senzilla, ràpida i eficient, sense interrupció de la circulació.
Es va aconseguir la recopilació de dades programada per tal de modelar segons la programació el moviment i tensió de les vies, correlat amb els canvis de temperatura.

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junio 19, 2020

Monitorización Cremallera de Montserrat

 

EL RETO

El Cremallera de Montserrat une la población de Monistrol de Montserrat con el emblemático Monasterio, en un recorrido de 5km, salvando un fuerte desnivel de 550m.

Debido a las fuertes variaciones de temperatura experimentadas entre verano e invierno, tanto la vía como el cremallera, sufren movimientos.

Para mitigar estos movimientos, se instalan tres posibles soluciones en tres zonas distintas del recorrido. Interesa conocer cual de las propuestas se traduce en una mejor reacción.

Para ello es necesario disponer de un sistema capaz de medir los efectos producidos en cada caso. El sistema aportará datos durante un periodo de tiempo suficientemente largo como para estar en disposición de elegir la solución óptima.

LA SOLUCIÓN

Se instalan 6 nodos con sensores clinómetro de triple eje, distanciómetro y temperatura cada uno de ellos. En cada una de las tres zonas de trabajo, un sensor verificará el movimiento del rail, mientras que el segundo lo hará del cremallera. Dado que la distancia entre las zonas supera los 500m, se han instalado dos modems, encargados de recibir los datos de los sensores.
2 sensores se instalaron sobre reas en taludes colindantes. El resto solidarios a las postes de la catenaria. Los modems o Gateways, junto con los paneles solares encargados de alimentarlos, también se instalan sobre los postes de catenaria.

Sensores y nodos funcionan de manera autónoma, con una batería interna de duración hasta 15 años, y transmisión de datos sin cables, por método propio Senceive. Los datos, recogidos cada 30’, una vez recibidos por el módem, son difundidas a la nube, para su visualización al WebMonitor.

EL RESULTADO

El sistema se instaló sin necesidad de interrumpir el tráfico, de forma rápida y eficiente.

Los calidad i frecuencia de datos de desplazamiento, temperatura e inclinación recopilados, permiten determinar las reacciones de los métodos correctivos propuestos en cada una de las tres zonas, tal y como estaba programado.

junio 19, 2020

Mine Monitoring: Open-pit / Underground

Challenge

Senceive’s wireless solutions for mining provide automatic, long-life, robust, reliable and near-real time monitoring. The ability to monitor multiple parameters using our sensor interface range provides “big-data” for a site and all the information required to aid prediction of failure and prevent catastrophes.
The low power system primarily allows remote structural/geotechnical monitoring to help with quick decision making and act as an early warning system by providing SMS text alerts and 24/7 imaging to identify any movement.

Solution

Compared to other types of monitoring systems, a wireless solution for mining is far more cost effective and less labour intensive than traditional wired systems, manual monitoring, optical systems and Automatic Total Stations (ATS). In most cases of open-pit mining and tailings, the system requires no power infrastructure at all and can operate autonomously with the ability to be remotely configured anywhere in the world. Compared to ATS systems, which can be extremely expensive for larger sites, a wireless solution provides better range, coverage of the site and can be installed in spaces with minimal clearance.

Senceive uniquely offer two wireless platforms to suit different types of mine. The FlatMesh® platform is designed for dense deployments and provides an Intelligent Earthworks Solution which aids prediction. The GeoWAN® platform, which is a star topography, can see through obstacles and provides longrange capability of up to 15km.

Outcome

The scalable systems are ideally suited to remote locations, as they are completely wireless and autonomous with practically no maintenance required at all. The products are virtually ‘plug and play’, which allows for ease of installation and flexibility for redeployments, which is further facilitated by the option of solar panels for FlatMesh® and minimal power infrastructure required for GeoWAN®.
The ruggedised sensors have been explicitly designed for harsh environments, so they are waterproof, durable and built for longevity with a battery life of up to 15 years. The versatile and reliable systems also give the client the control of their data and setup, by allowing registered users to access the WebMonitor visualisation software anywhere in the world. It also offers the option to use their own client software, change reporting rates and trigger levels, add new sites and much more. Assistance is always on hand from our dedicated support team.

junio 16, 2020

Masonry Bridge Monitoring: Formia Rail Line

Challenge

In order to obtain reliable information about the structural health of important Italian rail infrastructure, ETS srl and Microgeo srl have been using wireless sensors for the monitoring of a multi span Masonry Arch Bridge located on the Roma – Formia railway line.

Retrofitting works were designed by ETS’ engineers, who proposed sewing cracks and reinforcing the entire surface of the barrels with a reinforced concrete shell joined to the existing masonry arches through connection steel bars. In order to obtain appropriate information about the efficacy and functionality of the retrofit design, a precise and reliable monitoring system was required. Due to the particular geometry and monitoring requirements, several methods of monitoring architecture were evaluated.

Over all other instrumental solutions, a wireless one was selected on a trial basis to assess a section of the bridge. This offered a high cost savings, allowed control of thresholds safe values of monitored parameters and provided alerts in case of excessive deformations or displacements.

Solution

Senceive proposed the monitoring using wireless triaxial tilt nodes, as well as Optical Displacement Sensors (ODS), mounted on 1000mm beams. ODS nodes were easily fitted to beams using swivel mounts, then beams were quickly installed using self-tapping screws. Initial deployment consisted of 8 tilt sensors, measuring the rotation and 2 ODS installed on the underside of the bridge, at 12 o’clock positions, measuring rotational movement as well as the change in distance to the ground.

The wireless mesh network, formed by these sensors then transferred data to a solar powered 3G gateway. It used the mobile cellular network to relay data to a secure cloud server, which can be viewed and analysed by registered users of Senceive’s WebMonitor software.

Outcome

Sensors were extremely precise and the accuracy of ODS distance measurements showed a repeatability of ±0.15mm which also detected the natural “breathing” of the bridge to sub-mm precision.

The scalability of the FlatMesh® system allows it to be expanded easily and it gives the client control of changing; reporting rates, text alert trigger levels and the option for real-time monitoring if necessary. With a battery life of up to 15 years, the nodes are completely autonomous and monitoring duration can be increased if required. Eliminating any kind of intervention or maintenance also reduces the risk to site workers. Precise and reliable data continues to be received 24/7 and is supported by Senceive’s dedicated customer support and technical team.

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junio 16, 2020