CartThe International Society for Trenchless Technology
Found 95 results with term `` , from `Intl No-Dig-2019 Florence`
| Displaying 1 to 20 of 95 total papers | Previous 1 2 3 4 5 Next 20 | ||||||
| ID | Title | Event | Company | Year ▼ | Category | Abstract | Add to Cart |
|---|---|---|---|---|---|---|---|
| 2266 | A case study in successful sewer network rehabilitation with UV cured CIPP & Traditional/non-traditional survey technologies Author: Jan Borje Persson |
Intl No-Dig-2019 Florence | Bkp Berolina Polyester Gmbh & Co. | 2019 | Cured in Place Pipeliners |
This paper will focus on pipe condition assessment of approximately 16 Km followed by rehabilitation of over 3 kilometer of pipelines in a waste water network, using UV cured CIPP method, with reference to a project successfully completed in Ras Al Khaima, the United Arab Emirates. The project was undertaken by the local specialist contractors international Aramoon C. Ltd (IAC), using the BKP Berolina-Liner System and was part of a wider survey of approximately 16 kilometer of the network. BKP have co-operated in the region with IAC since 2009, completing the first installation in Saudi Arabia using the Berolina-Liner System in the autumn of that year. Survey of the network was undertaken using a combination of traditional CCTV inspection and Electroscan ?s state of the art FELL® system. Pipes rehabilitated included PVC pipes with diameters ranging from 200 mm to 500 mm. This paper will examine the results of the survey of the networks, the choice of the CIPP method and the factors that allowed IAC, the specialist contractor for the installation, to take advantage of the benefits of the tightly controlled parameters of the curing process using the Berolina-Liner System, to meet the local demands (click to report an error) more... share... |
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| 2288 | A MICROTUNNEL WITH A VERY LITTLE RADIUS FOR A BIG PIPELINE Author: Ugo Lazzarini, Antonio Guerini |
Intl No-Dig-2019 Florence | Max Streicher S.p.a I.c.o.p. S.p.a. | 2019 | Microtunneling and Pipe Jacking |
The use of the curvilinear microtunnel in c.a., for the installation of large diameter pipelines carrying natural gas, is now a well-established practice to overcome watercourses or major infrastructures. The choice to build a microtunnel with a curvilinear profile allows to significantly reducing the depth of pushing wells and the receipt of drilling and, consequently, the risks associated with underground work. The mechanical characteristics of the steel pipe to be positioned in the microtunnel heavily affect its size as the elastic radius of the pipe determines the minimum radius of the curvature of the microtunnel. In the case in question, a ND 1400 (56 ") steel pipe with a usual bending radius of about 1.600 m was laid to cross the Highway "Autostrada del Sole" by means of a microtunnel with an internal diameter of 2.100 mm. For the first time in the microtunnel, which we call "Costa Rica", of only 156 m length, it was possible to lay the pipeline with a radius of curvature reduced to only 800 m, much lower than that normally used. This was possible thanks to an innovative design choice that entrusted the success of the work to the perfect execution of the microtunnel along the project profile and the ability of the workers responsible for assembling the pipeline to manage it with absolute skill. The construction of the entire work, including the laying of the pipeline, was carried out in a shorter time and with absolute precision. (click to report an error) more... share... |
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| 2323 | A NEW FRP SOLUTION FOR RECONSTRUCTION OF DETERIORATED PIPES AND CULVERTS Author: Mo Ehsani |
Intl No-Dig-2019 Florence | University Of Arizona And Quakewrap Inc. | 2019 | Slip Linings (Loose Fit) |
Pipelines are a major component of the infrastructure that often get damaged by corrosion. In many cases, the repair may require restoring the strength of the pipe to its full original capacity, including the effect of external gravity loads. Access is always a challenge as these structures are buried deep and cutting trenches to replace the damaged pipe can add significant cost and time to the project.This paper introduces a new type of Fiber Reinforced Polymer (FRP) pipe developed by the author that utilizesthe sandwich construction techniqueto achieve high stiffness. The technique received the 2016 American Society of Civil Engineers (ASCE) Innovation Award as the world's first green and sustainable pipe. This technology allows two methods of repair. In one case a custom pipe can be builtto any shape and size in segments of any length up to 10m long that can be used to slip-line the old pipe. In the other case, the host pipe is used as a mold to build a fully structural pipe below ground on site.The paper focuses on threesuccessfully completed projects in the US, Australia and Puerto Rico where both pressure pipes and gravity flow culverts have been repaired under some unique challenging conditions. (click to report an error) more... share... |
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| 2306 | A NOVEL CYBER-MONITORING BASED ASSET MANAGEMENT SCHEME FOR WATER DISTRIBUTION NETWORKS THROUGH FINE-TUNING GENETIC ALGORITHM PARAMETERS Author: Ahmad Momeni and Kalyan R. Piratla |
Intl No-Dig-2019 Florence | Glenn Department Of Civil And Environmental Engineering, Clemson University | 2019 | Site Survey / Pipe Inspection |
There has been an urgent need to monitor, model, and tackle the extreme deterioration of water pipeline systems in the United States and other parts of the world to the quickest and best extent. Since manual pipeline inspection takes excessive costs, effort and time to consider most uncertainties, a novel and swift scheme is required to engage in asset management, which should ensure the accuracy as well as the quickness of the inspection at minimum effort and cost. This paper presents and validates a framework to predict the condition of critical pipeline assets using water distribution monitoring data. A benchmark water distribution network is first operationally optimized, and its pipe roughness values and diameters are subsequently reduced in a random manner in order to create a representation of an old and deteriorated water distribution network. The operational data (i.e., pipe flow and pressure) for such deteriorated network as obtained through simulations using EPANET 2.0 is leveraged to predict the pipe roughness and effective hydraulic diameter values. Evolutionary optimization algorithms are used to predict the roughness and diameter values. The novelty of this study entails: (i) employing modified genetic algorithms in MATLAB interface where multiple attempts are made towards finding the optimal solution by running on several distinct sets of initial population in conjunction with fine-tuning of mutation and crossover parameters; (ii) including an ad hoc function to cut down on the temporal expensiveness of the convergence; and (iii) assessing the validity and accuracy of the simulation-based optimization framework using mean absolute error (MAE) and mean absolute percentage error (MAPE). Successful outcomes of this study offer a great potential in predicting condition of critical water infrastructure assets based on the operational monitoring data that is increasingly being collected in the recent times (click to report an error) more... share... |
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| 2245 | A Novel IoT Application System Using Wearable PPG Heart Rate Monitoring Devices to Improve Safety Management for Shield Tunnel Construction Projects Author: Wei-Cheng Chen, Hui-Ping Tserng and Josh Huang |
Intl No-Dig-2019 Florence | Department Of Civil Engineering, National Taiwan University; Gini Bio-technology Corporation Limit | 2019 | Associated Technologies, Techniques and Equipment |
According to the latest statistics revealed by International Labor Organization (ILO), 33.7 million accidenceshappened around the global with USD1.2 trillion lostconsequently.Safety management has been acting as the mostimportant role in allnationalconstruction projects, that encourages innovative technologiesto be introduced to many construction projectstosave more precious lives. This paper proposes wearable heart rate monitoringdevices andsenor networksto instantlyassess worker's workload,that can prevent accidents caused byworker's unintentionalerrors.Heartrate is commonly recognized as human'sphysical and psychological index used to assess one's health status inclinics. Thanks to the advance of micro photo-electronic technologies, the Photoplethysmography(PPG) deviceis popularly used as the heart rate monitorintheathletic trainingprogram. To extend the value-addedapplicationof wearable PPG devices, we've developed a novel IoT system incorporated with the bioinformatics theory. Therefore, we can continuously monitor and collect construction worker's heart rate without interfering their routine work. In our experiment,16 volunteer workers from a shield tunnel construction project have joinedourfield test. However, theresult of our firstfield testwas notsatisfactory. Modification workof wearable PPGdevices and IoT gateways wereconducted successfully to fulfillthe expected data availabilityof 80%. We increasedthe data transmission rate of the PPG device, andincreased the number IoT gateways installedin the shield tunnel. Finally, we have successfully achieved 85% of the dataavailability in our secondfield testconductedinOctober and November2018.In this paper, we demonstratethe PPG heartrate monitoring device, Bluetooth sensor network and application system used in the shield tunnel construction projects. In order to analyzeworker's workload, we've established the standard procedure of measuring worker's Resting HeartRate (RHR), the assessment method of Percentage of Reserve HeartRate (%HRR) and Workload (%L), which can be appliedas the guideline forarranging worker's shiftsand tasksinthe shield tunnel construction projects (click to report an error) more... share... |
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| 2241 | A novel monitoring procedure for assess the correct road pavement restoration after the One-Day-Dig mini-trenching installation Author: Gianluca Cerni, Barbara Bernardini, Diana Salciarini, Federica Ronchi, Alessandro Corradini, Evelina Volpe |
Intl No-Dig-2019 Florence | University Of Perugia,department Of Civil And Environmental Engineering; University Of Molise, Dep | 2019 | Asset Management and Work Planning |
This paper presents the results of a monitoring campaign aimed at evaluating the road restoration process of the One-Day-Dig (1DD) mini-trenching technology in terms of pavement evenness. The 1DD, patented by SIRTI, leading Italian company in the infrastructure sector for telecommunications, is an innovative installation method for the creation of a narrow trench to lay cable or micro-duct in the ground. In a few hours, the trench is backfilled and sealed, speeding up the construction process and reducing any aesthetic issues thanks to the small footprint that will fade over time.In this experimental activity, more than 20 kilometersof roadnetwork interested by 1DD mini-trenching were detected using a 3D laser scanner. The point clouds collected by the laser scanner have been handled using an open source processing software and developing a proper procedure to manage the whole dataset. The main goal of the procedure is to assess the vertical deviations of the mini-trench surface from a reference plan representative of the road pavement.Results show that either negative (sags) or positive deviations (bumps) are determined with a high level of accuracy for the entire route realized in 1DD. Furthermore, the available data can be analyzed considering different levels of inspection, from local evenness evaluations to a wider scale of assessments such ason hundred meters stretches. (click to report an error) more... share... |
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| 2307 | A PIPE-DETECTING PROJECT AND TECHNICAL ASSISTANCE IN BANGLADESH Author: Kazuki Kito, Masahiro Yoshimoto; Koji Kamiyo |
Intl No-Dig-2019 Florence | Tepco Power Grid; Geo Search Co. | 2019 | Site Survey / Pipe Inspection |
This paper describes a pipe-detecting project and how it improved the accuracy of available information by using electromagnetic radar. The project was conducted in Dhaka, the capital of the People's Republic of Bangladesh, in early 2019. TEPCO Power Grid, Inc. (TEPCO) is providing consulting services for the construction of Bangladesh's first underground substation and for an underground transmission-and-distribution cable improvement project. This project included the design of approx. 5 km of distribution line. The design needed a detailed and precise map of buried pipes to plan the installation of the new pipes. However, Dhaka presented some challenging problems, such as (1) prohibition on road digging due to chronic congestion, (2) lack of accurate information on buried pipes, and (3) insufficient technology (i.e. underground detection technology). These problems made it difficult to use general methods for experimental digging and underground detection on-site for the project. To address these problems, a team of experts from TEPCO and Geo Search, a high-tech company specializing in underground detection, conducted a pipe-detecting project in Dhaka. The project was also conducted to train engineers from the Bangladesh University of Engineering & Technology, with the aim of contributing socially to the country of Bangladesh. Remarkably, the project found 35 utility pipes within the area of the planned distribution line, 29 of which (83%) were non-registered pipes that may have had a large impact on the planning and installation of the distribution line. (click to report an error) more... share... |
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| 2251 | A UNIQUE EXAMPLE OF CLOSE FIT LINING TECHNOLOGY FOR THE RENEWAL OF WATER PIPES ALONG THE BRIDGE "PONTE PUNTA PENNA" IN TARANTO Author: Giovanni Bramante, Gianluca Casamassima, Celestino Davide Tria, Antonio Schinaia; Federica Fuselli |
Intl No-Dig-2019 Florence | Acquedotto Pugliese S.p.a; Rotech Srl | 2019 | Close-Fit Linings |
The Project concerning the rehabilitation of four pressure pipes located inside the bridge "Ponte Punta Penna-Pizzone" in Taranto represents one of the most significant international examples in the field of close-fit lining technology. The bridge rests on 14 spans rising to 47m and holds four steel pipes of 1200m in length DN 500mm hanging inside the deck. Through these pipelines passes a water flow of 500 l/s ensuring the water needs of about 200,000 inhabitants. The rehabilitation through close-fit lining technology consists in inserting into each of the four pipelines a new tube in high-strength polyethylene which is temporarily deformed and subsequently restored into the required shape and size to adhere perfectly to the inner wall of the existing pipe. The advantage consists in avoiding a significant reduction of the hydraulic section and in obtaining a new pipeline that guarantees its own structural resistance independent of the contribution of the existing pipeline. Another important advantage is the stability even in the presence of severe corrosion of the hosting pipe with an extension of the working life cycle of the pipelines by 80 years. A qualified team had to be identified with a strong innovative capacity and capable of ensuring a coordinated project throughout all its development. The cost of rehabilitation was 2.5 million euro. The project was successfully completed in 9 months. (click to report an error) more... share... |
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| 2252 | Advances in CIPP Pressure Pipe Liner Testing and Design Author: Kay Awe, Mark Knight, Ahmed Abdel-aal, George Bontus |
Intl No-Dig-2019 Florence | Department Of Civil And Environmental Engineering, University Of Waterloo; Aegion Corporation | 2019 | Cured in Place Pipeliners |
In North America CIPP pressure liners are typically designed using ASTM F1216 Appendix x1.1. This paper will discuss ASTM F 1216 design method limitations for the design of potable water CIPP pressure liners and the need to complete hydrostatic burst tests on full scale CIPP samples. It will then discuss the development of the Waterloo CIPP Pressure liner test facility and test results on a CIPP liner products available in North America. The test results will show significant short-term burst test variability and how this variability can impact the CIPP liner pressure rating. (click to report an error) more... share... |
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| 2308 | AN AUTOMATED LEAKAGE DETECTION MODEL FOR WATER DISTRIBUTION SYSTEM Author: Harshit Shukla and Kalyan R. Piratla |
Intl No-Dig-2019 Florence | Glenn Department Of Civil Engineering, Clemson University | 2019 | Site Survey / Pipe Inspection |
Leakages are the enemy of water supply systems all over the world. According to recent studies, at least 20% of treated freshwater is lost during transportation due to the leakages. The contemporary leakage detection techniques are able to locate the leakages in the buried pipeline system. However, they require a skilled workforce, expansive equipment and does not support the continuous monitoring of water pipeline networks for leakage detection. In this paper, authors present a deep learning convolutional neural network (CNN) model to predict the leakage sizes using the flow-induced vibration data. The main objective of this study was to use the acceleration signal data collected from a single accelerometer to detect the leakages of the given pipeline network. A two looped pipeline network which comprises a pump, reservoir of 820-litre capacity, varying pipeline diameters, burial conditions, various bends, T-joints, leak simulators and a flowmeter was used to collect flow-induced vibration using accelerometers. In this experimental setup, half of the pipeline length was unburied and the other half was buried with soil backfill. A total of 12 accelerometers were mounted across the pipeline network where 6 accelerometers were mounted on the unburied pipeline and remaining 6 accelerometers were mounted on the buried pipeline network. Several leakage scenarios were designed and acceleration signal data was then converted into image format using continuous wavelet transformation (scalogram) plotted as a function of time and frequency. These images were used to train a CNN model with the help of AlexNet (pre-trained network). The final layers of AlexNet were modified according to the need of scalogram image data and 80% of the total images were used to train and develop the CNN model. The trained model was used to predict the leakage scenarios of the remaining 20% of the images. The prediction accuracy of the trained CNN model was found to be approximately 90%. The findings of this study suggest that the acceleration signal of a single accelerometer can be used to predict the leakage sizes of the given pipeline network with 90% accuracy. Predictive models would allow the water utility companies to monitor their water distribution system in near real time and detect the leakages in the early stage to minimize the loss of treated freshwater. (click to report an error) more... share... |
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| 2327 | Application of solubilizing surfactant in trenchless drilling fluid Author: XuLanbo and Wu Xiaoming |
Intl No-Dig-2019 Florence | Faculty Of Engineering, China University Of Geosciences | 2019 | Testing & Assessments |
In trenchless construction,the dissolution rate of drilling fluid mixing is too slow,which requires a long time to be pre-hydrated and dissolved.In actual construction,people have to put incompletely dissolved drilling fluid into the hole ahead of time.The drilling fluid with incomplete performance can not achieve the expected effect.Itnot only affects the quality of the project,wastes materials,but also sometimes bringsadverse effects.Aiming at this problem,solubilizing surfactant which is the key factor affecting the solubility of drilling fluid was found out.Adding surfactant in drilling fluid can reduce the wetting speed of bentonite powder and prevent it from caking when mixing.At the same time,and the mutual exclusion between fat molecules and water molecules is eliminated,so that drilling fluid additive can quickly wet and disperse in the liquid.Through the solubility test,the solubilization efficiency of different surfactants was compared,the suitable surfactants were selected and the efficient instant drilling fluid system was developed.Compared with common trenchless drilling fluid system,the apparent viscosity of drilling fluid increased by 65% in 30 minutes (click to report an error) more... share... |
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| 2309 | ASSESSING THE UNDERWORLD -A THREE-INFRASTRUCTURE APPROACH TO REMOTE SENSING Author: Chris Rogers, David Chapman,Nicole Metje and Mehran Eskandari Torbaghan |
Intl No-Dig-2019 Florence | Department Of Civil Engineering, Universityof Birmingham | 2019 | Site Survey / Pipe Inspection |
Many of the major challenges to a flourishing and pervasive trenchless industry are acutely associated with the complex urban context in which the works are carried out. The first, and most often quoted,challenge, is knowing where the current buried infrastructure is situated, and consequently 'seeing below the ground' to detect, locate and map existing pipes and cablesis the subject of much research (including the UK's Mapping The Underworld). Knowing where and what the buried infrastructure is enables both detailed planning and, crucially, de-risking of trenchless projects. However, such knowledge provides streetworks engineers with only part of what they need: this paper takes a broader, systemsview of the streetworks context to enable engineering works to be properly conceived, designed and carried out to provide thebest long-term outcomes in the circumstances. The enabling step is to consider streetworks as engineering interventions in three strongly-interdependent infrastructures -road infrastructure, buried infrastructure and the geotechnical infrastructure that supports them both -all having different structural performance criteria and deterioration models, and all in potentially different current states of structural competence. Disturb any one infrastructure and the other two will be affected in some way; disturb all three and the whole system dynamic is changed. The paper therefore argues that the brief for surveying in advance of trenchless works should be broadened to cover the constitution and the condition of all three infrastructures, from which the engineering consequences of trenching (which almost always adversely affectsthe condition of adjacent buried pipes and cables, hence all three infrastructures) and trenchless operations (with usually fewer adverse consequences to this system) can be far moreaccurately determined. The paper describesthe outcomes of Assessing The Underworld -a 4-year research programme exploring how surveying approaches and technologies can meet this challenge. (click to report an error) more... share... |
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| 2250 | AWWA Watermain Rehabilitation Initiatives Author: Mark Knight |
Intl No-Dig-2019 Florence | Department Of Civil And Environmental Engineering, University Of Waterloo | 2019 | Cured in Place Pipeliners |
The American Water Works Association (AWWA) is currently developing standards on Watermain rehabilitation - CIPP and Sliplining. It has also recently completed a white paper that provides quantitative tests to classify watermain rehabilitation products and gives guidance on design of pressure lining systems. AWWA is also revising M28 the Watermain Rehabilitation manual. This paper will discuss in detail AWWA ongoing and completed initiatives. (click to report an error) more... share... |
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| 2242 | Business and the SDGs Author: Per Holm |
Intl No-Dig-2019 Florence | Blukolding | 2019 | Asset Management and Work Planning |
We believe that everything we do must contribute to a viable and sustainable world without waste. We exist to protect our common values, the water environment and public health. In order to do so we work with the Blue Economy, circular thinking and the UN's Sustainable Development Goals. We will not settle for minimizing damages to nature and the climate. We strive to complete reverse the trend and raise the level of ambition from doing less damage to doing more good. We believe it is possible, because we have already done it. We have evolved from a traditional waste water company focusing on doing less damage to nature and the water environment to a contemporary environmental, energy and climate company that wants to do more good. From simply cleaning the waste water and making sure it does no damage to upcycling it, and other natural resources. From believing that modesty is the best policy to leading by example by sharing our knowledge, ideas, and accomplishments to inspire customers, partners and the rest of the world. (click to report an error) more... share... |
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| 2253 | CIPP - Advantages, risks and potentials of LED curing Author: Niklas Ernst |
Intl No-Dig-2019 Florence | Bluelight Gmbh | 2019 | Cured in Place Pipeliners |
Bluelight is a LED curing CIPP system for laterals and small pipes. It works in a diameter-range between 100mm and 250mm (from 4 inch to 10 inch) with flexible liners and can perform diameter changes plus bends up to 90 degrees. Nonflexible GFRP liners can also be cured from 200mm up to 300mm. The curing is performed by LEDs in the wavelength of the blue light (450 nm). The carrier is based on flexible felt with a PU coating or GFRP. The resin is based on a styrene free vinyl-ester backbone with a patented photo-initiator that reacts only in the wavelength of the light-heads. In recent years, the Bluelight LED system technology developed by Danish Per Aarsleff A/S has become established in Germany, Switzerland and Scandinavia as a standard method for renovating pipe liners inconnecting pipes. The system technology on offer consists of patent-protected curing technology and matching pipe liners which have been approved by the DIBT (German Civil Engineering Institute). In practice, this approach has proved itself to be simple, fast, clean, practically noise and odor-free and, most importantly, reliable right from the first moment of use. What are the future development potentials of LED curing technology? Before discussing future potentials, it is first worth looking in detail at the principles that underpin this method. We shall also indicate the limitations of the technology and point out the risks of various combinations of liners and curing methods. (click to report an error) more... share... |
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| 2254 | CIPP RELINING OF A DN 300 mm PRESSURE STEEL WATER PIPE ANCHORED UNDER THE ANCIENT Bridge of the Academy in the historic center of Venice Author: Gianluca Paro |
Intl No-Dig-2019 Florence | Risanamento Fognature Spa | 2019 | Cured in Place Pipeliners |
Recent restoration of the bridge has started at the end of 2017 and the renovation works of the "Accademia" bridge in Venice has been coordinated directly by the Maintenance and Viability office of the Venice Historic Center - Public Works Directorate of the Municipality. On this occasion, since jobsite was set for months, various worn technological systems crossing the bridge have been replaced or reinforced to bring light, water, gas... The restoration jobsite of the second main bridge built on the Grand Canal after Rialto one, necessarily implied the construction of important temporary accesses for pedestrian to the work site, minimizing the impact of site on the delicate urban fabric of Venice. With the commencement of the works, Works Management has wisely involved all the interested parties, including the managers of the sub-services that cross the bridge itself. Given the importance of the intervention, the goal was to allow the renewal of all the dated artefacts that were present within the bridge (click to report an error) more... share... |
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| 2310 | Condition monitoring of excavated CIPP-liners to ensure lifespan Author: Love Pallon, Olle Persson, Erik Marklund, Annika Malm and Thomas Johansson |
Intl No-Dig-2019 Florence | Rise Research Institutes Of Sweden; Renoverava | 2019 | Site Survey / Pipe Inspection |
In Sweden there is a lack of knowledge on the expected service life of installed CIPP-liners and a general aim to request CIPP-liners with a 100-year lifespan. In cooperation with Swedish water utilities a national project has been launched for condition monitoring of used CIPP-liners. A large number of CIPP-liners installed in sewage pipes will be excavated and analyzed in order to evaluate material degradation and estimating remaining service life. The CIPP-liners are all between 5-35 years old.The material performance of the CIPP-liners are either compared with the reference data provided from the installation, or in some case compared to pieces of corresponding CIPP-liners that have been kept in a storage. These piecesbecomes especially valuable when looking at possible changes in mechanical properties that may have occurred during the time in use. The materials will be assessed by e.g. bending modulus to investigate material integrity and e.g. FT-IR for chemical stability in the environment of the sewage system. In total the results will give a valuable tool in assessing the expected lifetime of the installed CIPP-liners. The knowledge acquired will help Swedish water utilities to predict service life of installed CIPP-liners and to set sufficient quality demands on new installations for pipe renovation. At an initial stage two excavated CIPP-liners that have been in use for 12 and 16 years have been analyzedand compared with reference data from the time of installation (click to report an error) more... share... |
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| 2244 | Consideration in planning successful trenchless utility installations Author: Loui Thomsen and Jesper E. Andersen |
Intl No-Dig-2019 Florence | Department Of Water And Nature, Cowi A/s | 2019 | Asset Management and Work Planning |
In the northern part of Europe many trenchless utilityinstallations are done on a slim baseline of preliminary investigations, assessments and planning.It's not just about choosing the right trenchless technique but also considering manyother factors in the planning phase to insurea successful installation. Based on more than 10 years of experience COWI has developed a well-functioningpraxis for the task.This paperdescribesthe overall background of trenchless installationsin Denmark and the development of same. The continues development withinthe last decade has resulted in anecessity to make throughconsiderations before executing trenchlessinstallationshence the need for a planning methodic. The paper will fathom the fundamentals of the COWI way of planning trenchless utility installations. Furthermore,the paper contains the baseline of our way of executingand plan site investigations before executing the actual utility installationsalong with ourway of evaluating results of executed site investigations.Likewise,the paper will show the overall praxis of COWI's final assessment of recommended installation praxis and methods. (click to report an error) more... share... |
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| 2297 | Contact Mechanics and its Normalized Indices for Trenchless Cutting Associated with Machine Learning Author: Li-Hsien Chen, Jhih-Ping Huang, Yao-Chung Chen |
Intl No-Dig-2019 Florence | Department Of Civil Engineering, National Taipeiuniversityof Technology; Department Of Constructio | 2019 | Microtunneling and Pipe Jacking |
This study aims at investigation of underground mechanical excavation including both design and construction as turnkey project. During both stages, contact mechanicswith unified normalized indices were developed for trenchless cutting process. By using dimensional analysis, the proposed model generalizes mechanical as well as geological characteristics corresponding to two main types of cutting forces (thrust and torque) to evaluate their excavation progress with penetration rate. Furthermore, the normalized cutting indices can be used not only to estimate the functionality and efficiency of cutting machine adopted for tunneling project, but also to offer a warning system for inadequate cutting strategy.In addition, this study also examine the feasibility of cutting indices to predict the change in geological conditions during cutting process by using machine learning/data miningpackageso-called WEKA. Comparing withtwo case histories, some crucial applicable results show that the difference methods between classical mechanics and novel AI approach are quite useful to examine the cutting behavior during the life cycle of tunneling project (click to report an error) more... share... |
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| 2305 | CRITICAL ANALYSIS OFPIPE RAMMING BEHAVIOR AND FACTORS THAT IMPACT PREDICTIVE MODELS. Author: Kimberlie Staheli; Armin Stuedlein |
Intl No-Dig-2019 Florence | Staheli Trenchless Consultant; Geotechnical Engineering Dept, Oregon State University | 2019 | Pipe Ramming and Impact Mole |
The limits of pipe ramming technology are being stretched on a regular basis. Rams are increasingly installed in longer lengths, in more aggressive/dense geotechnical conditions, below the water table, and to installation tolerancesthat allow the installation of gravity pipelines within the rammed casings. Advances to the technology are largely led by innovations in the field, with engineers striving to develop design parameters that model the performance of the technology. In an effort to understand the mechanisms controlling the ramming, three projects were instrumented during construction to gather information. The instrumentation, consisting of strain gages and accelerometers, commonly used for pile driving analysis, were placed on pipe rams ranging from 915mm (36-inch) to 2130mm (84-inch)diameter. Field data from the instrumentation was collected throughout the ramming while detailed field notes were taken, documenting all aspects of construction. This allowed correlation of ramming data with construction activities, andquantification of parameters that impact overall ramming loads.This paper details a case history of an instrumented project, presenting project details such as design parameters, geotechnical conditions, execution of the ramming, groundwater control, and contractor activities throughout construction. Important design parameters that contribute to the success of large pipe ramming projects are presented. The results of the data and ramming activitiesare analyzed to quantify parameters such as hammer efficiency, resistance on the casing, force on the cutting shoe, advance rates, and hammer blows per meter. (click to report an error) more... share... |
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