User`s Manual
Contents
1. Consider Rehabilitation Does the number of repairs for the proposed line exceed 3 C 1 2 Project Input Based on the definition of the problem the software will only be considering New Alignment methods but trenchless methods for Inline Replacement and Rehabilitation methods can be added to the evaluation by checking their respective check boxes Next the user is asked to input the following installation parameters Drive Length 175 m new Pipe Diameter 600 mm Depth of Cover 6 m Alignment Accuracy 4 High defined in Section D 1 Profile Accuracy 4 High defined in Section D 1 and Ground Water Table Depth 4 m Input these values into the Construction Parameters page and then click the Next tab Input the Construction parameters below Drive Length Pipe Diameter Depth of Cover Alignment Accuracy 4 Maximum Deviation of 0 1 m 4 in Profile Accuracy 4 Maximum Deviation of 01 m 4 in Ground Water Table Depth la m The three dominant soils along the alignment are Medium Sand 40 Soft Clay 35 and Gravel 25 Input these values into the Soil Parameters page by first selecting the three soils and then adjusting their respective percentages Then click Next Input the soil parameters below Soll Type 1 Medium Sand Soil Type 1 is the dominant soil along 40 A g percent of alignment Soil Typ2. 575 ft stretch of 600 mm 24 in vitrified clay pipe Relevant Input parameters are summarized below J Edward Drain Interceptor Information Summar GWT Depth 4 5m 15 ft Soil Type 2 Soft Clay 35 Soil Type 3 Gravel 25 N A Not Applicable TAG consists of 2 primary phases a technical evaluation and a risk analysis The verification exercise begins with the extraction of the relevant technical information from the design documents for use as input data Rehabilitation methods were not considered due to the fact that more capacity was needed C 1 1 Problem Selection Begin by clicking on Technical Evaluation at the top of the main page which leads to the Structure Selection page Select the type of structure that needs addressing which in Case 1 is Pipelines and Sanitary Sewer Gravity Flow and then click Next Select the type of Structure that needs addressing Pipelines Sanitary Sewer Force Main Sanitary Sewer Gravity Flaw Storm Sewer Combined Sewer Potable Water Pressure Sewer Lateral Access Points Manholes Nex Since the pipe is lacking capacity select Capacity Problem Then select Consider New Alignment Includes Open Cut Methods and then click Next Select the type of Construction you want to consider Structural Problem Capacity Problem Consider New Alignment Includes Open Cut Methods E Consider Inline Replacement
3. OF PROGRAM PARAMETERS occconcconoconnnccnnnccnonccnoniccnnnccnnnccnonocconccnonircnonos 15 Eis SOC OMIA ONLY iii lianas 16 BZ EnvronmentallA Data nilo lidad diia iia 16 E 1 3 XTC Ol EC Va HON it iS 17 E 1 4 Groundwater Table Classification occcooccnnccnnoccnnccnnoconnccnnoconorcnnoconornnnoconoronnrconocnnnccnncnns 17 EES Alenmentand Promle ANCCuracy ci 17 E 2 DEFINITION OF REHABILITATION PARAMETERS ocooccconccnonicccnniconnnnononccnonccnonaccnnarononos 17 FD Enoe In Mn EE AE ad caus wadelyame asta eunde ESS 18 B22 Dam eean a 18 Ez Pipe Dent di E id ia 18 E 2 4 CTOSS S ECHO Reductions e a a ii 18 EZ MIES toa 18 E 2 6 A AO 18 A o o A A E A ee ee ne 19 E 2 8 SIS EAS A a a 19 E29 Revere Cury A A E E EA tote E O a E TEE 19 AA sl A O satan ota tiaae 19 BIE ACCC OSS arabes Stace cote OE 19 E 3 DEFINITION OF MANHOLE PARAMETERS occconoccnocononccnonccconoccnnonononccnonccnonocconaranonicnones 20 B34 o esac ease stents a se ceo ects sees ese ect sts en ese ae Seen ee cee 20 E 3 2 lis A te toca E E a E T TEE T TEN 20 E 3 3 A AA A A A 20 Eds COUCH MAM CIC ICM CIC dai 21 A NS ncn ne Nerina Crs ae 21 ESO MN CIE IR Cd wes roe i cca ba aoe eae cae des ao ee is San Bad Oo ara 21 AAA oe Ee Snes Smee eRe eae ete ee 21 A INTRODUCTION A l BACKGROUND The decision of how to accomplish the installation or repair of a buried pipe in an urban environment involves tangible and intangible parameters To assist with that dec
4. Pipe Diameter ft Depth of GWT ft E 1 5 Alignment and Profile Accuracy These parameters refer to the anticipated level of installation accuracy that will be needed Database Symbol No Steering Capabilities 2 Limited Steering Capabilities Medium 3 Dedicated Tracking and Steering Capabilities 4 High 4 Maximum Deviation of 4 Very High Maximum Deviation of 2 E 2 DEFINITION OF REHABILITATION PARAMETERS The rehabilitation parameters can be defined by clicking the Need Help links next to their names on the input screens The following parameters are defined below length diameter pipe deterioration cross section reduction pipe access bends shape size transition reverse curvature service connection and lateral access Very Low Low 17 E 2 1 Length The maximum length of any host pipeline section on the project to be renewed E 2 2 Diameter The diameter of the host pipe which requires renewal E 2 3 Pipe Deterioration Partially Deteriorated Non Structural The original pipe can support the soil and surcharge load throughout the design life of the rehabilitated pipe The soil adjacent to the existing pipe must provide adequate side support The pipe may have longitudinal cracks and up to 10 distortion of the diameter Fully Deteriorated Structural The original pipe 1s not structurally sound and cannot support soil and live loads nor 1s 1t expected to reach this condition ove
5. fatigue including minor corrosion infiltration or exfiltration through precast joints mortar joints or around the pipe connections Protective Coating The manhole is exhibiting early signs of structural fatigue evidenced by minor cracks loss of mortar or brick corrosion less than 0 5 in in depth minor cross sectional distortion less than 10 however the existing structure is currently supporting the soil and live loads Structural Renewal The manhole is exhibiting severe structural fatigue and collapse is eminent Conditions indicating this degree of deterioration would be distortion beyond 10 severe corrosion exposed reinforcing or large sections of the existing structure are missing E 3 2 Infiltration Inflow Infiltration Typically groundwater that flows into the manhole through joints cracks bench invert pipe connections etc Inflow Typically runoff water during a rainfall event that flows through manhole cover holes between the casting and the chimney E 3 3 Corrosion No Corrosion The manhole is in very good condition with some of the brick mortar or concrete surface in a solid hard condition Light Wall Corrosion The brick mortar is deteriorated and missing or concrete surfaces are soft and flaking in spots Heavy Wall Corrosion Bricks and mortar are missing in a number of areas of the manhole or several inches of soft concrete wall and sections of the wall surface are missing 20 E 3 4 S
6. formulation used for calculating the risk score for each construction method The risk score is the weighted average of six contributing risk factors Four of these factors Length Ratio Diameter Ratio Depth Ratio and Soil Compatibility Index reflect the level of comfort with which a construction method meets the project s technical requirements In other words regardless of whether the installation length is at the 25 or 95 percentile of the method s range the method will be deemed technically viable However it is argued that the potential risk in the latter case is greater than it 1s in the former case The relative level of risk 1s expressed as the ratio of the installation s length to the maximum installation range of the method under consideration The same rationale is applied to the depth of installation and product diameter For soil compatibility the level of risk is based on the percentage of Possibly Compatible soils along the project s alignment For example in the second case study soil conditions were specified as medium sand 60 stiff hard clay 35 and gravel 5 If a method is only possibly compatible with medium sand and gravel 65 of alignment and fully compatible with hard clay then the perceived risk is considered to be higher than if the method was fully compatible with medium sand and stiff hard clay but only possibly compatible with gravel 5 of alignment The remaining two parameters that comprise t
7. method database These values are based on many factors which include potential for ground settlement and heave potential damage to paved surfaces nearby utilities and foundations erosion removal of trees and flora creation of temporary hazards 1 e open trenches and the potential for the migration of drilling fluids to the surface Environmental Impact Database Symbol Very Low Low Medium Pgh a VeryHigh S 16 E 1 3 Extent of Excavation The values for allowable extent of excavation are fixed in the construction method database Database Extent of Excavation Symbol Methods Continuous Excavations All methods can be used Z Excludes backhoe excavation Access Receiving Pits Only Excludes all open cut methods E 1 4 Groundwater Table Classification The technical feasibility of certain trenchless construction methods is conditioned upon the height of the hydrostatic head acting on the cavity in other words the elevation of the proposed alignment with respect to the elevation of the groundwater table GWT The values for groundwater table classification are fixed in the construction method database Groundwater Table Classification Database Symbol Can handle at least 10 ft of hydrostatic head Can handle up to 10 ft of hydrostatic head Can handle up to 3ft of hydrostatic head C3 The formula for height of hydrostatic head 1s as follows Hydrostatic Head ft Depth of the Installation ft
8. Problem 5 the number of repairs for the C 2 2 Project Input The gravity driven sewer was a 95 m 300 ft long 600 mm 24 1n diameter vitrified clay pipe with an average depth of about 6 m 20 ft The input form for the inline replacement data is shown below m i rn dia m pa m x Th Hiii COI Drive Length Pipe Diameter Depth of Cower Alignment Accuracy 4 Maximum Deviation of 0 1 m Profile Accuracy 4 Maximum Deviation of 0 1 m Ground Water Table Depth l6 m Defined in the User s Manual 10 Based on CCTV inspection data 1t was concluded that the host pipe was fully deteriorated and thus a structural solution capable of resisting earth loads any relevant live loads and the hydrostatic pressure applied by the groundwater was needed Input the Construction parameters below Length 95 m Need help Diameter 600 mm Need help What is the deterioration level of the host pipe Fully Deteriorated Structural Need help How much can the cross section of the host pipe be reduced by the renewal Minimal Need help What type of access is available to install the technology Need help Does the host pipe contain any bends Need help What is the cross sectional shape of the host pipe Circular Need help Does the pipe have a cross section size transition Need help Does the host pipe have a reverse crown curvature Need help Soil conditions and the host and new pipe detai
9. TAG R ONLINE TRENCHLESS ASSESSMENT GUIDE User s Manual Version 3 0 February 2009 Developed for The National Utility Contractors Association ot AME p A if Wi Y We Lenin Y equa And The National Association of Sewer Service Companies By The Trenchless Technology Center Louisiana Tech University TRENCHLESS TECHNOLOG CENTER Credits John C Matthews Dr Zhenyang Duan Joseph Berchmans and Prof Erez N Allouche TTC DISCLAIMER This manual and program entitled Trenchless Assessment Guide TAG R was prepared by the Trenchless Technology Center TTC for the National Utility Contractors Association s NUCA s Trenchless Technology Committee and for the National Association of Sewer Service Companies NASSCO Neither TTC NUCA NASSCO nor any person acting on their behalf makes a warranty express or implied with respect to the use of any information apparatus method or process disclosed in this manual or that such use may not infringe on privately owned rights or assumes any liabilities with respect to the use of or for damages resulting from the use of any information apparatus method or process disclosed in this manual or on this program NUCA DISCLAIMER The suggestions procedures and precautions set forth in this manual and on this program are a compilation and explanation of methods and equipment successfully used by contractors to install underground utilities The
10. and or replacement method s were found to solve the given Problem Please input the type of Specifications level of Experience and known Track Record for each method SET Criteria Category Method Specifications Experience Track Record TT Method Microtunneling Slurry National ASTM v Some X More Than 5Years v Please apply the appropriate Weight to each risk parameter based on its importance to you Risk Factor Weight Assignment Soil Environmental Impact Compatibility peared Length Ratio SETIndex Depth Ratio Index You may choose to leave the weights at their default values with each risk factor having an equal weight Now select the Site Accessibility from one of the five options shown Limited Accessibility in this case and then click Calculate Risk Scores Please select the level of Site Accessibility for the given project Site Accessibility High Accessibility The installation right of way is fully accessible over the entire length of the alignment An example of this site would be a green field y Medium High Accessibility The installation right of way is almost completely accessible An example of this site would be low density housing C Medium Accessibility The installation right of way is accessible with some difficulty An example of this site would be an industrial or residential area Limited Accessibility The installation right of way is accessible in a limited number of sections An example of this
11. design no longer are applicable as a structural design solution A reverse arch configuration can be lined with a smaller round pipe and then back grouted to provide a structural solution E 2 10 Service Connection No Service Connections The pipe has no domestic or commercial connections in the section being renewed Internally The service connections in the new pipe can be opened internally to provide the applicable level of service Externally The service connections must be reconnected externally to provide the required level of service Either The service connections can be connected by either method to provide the required level of service E 2 11 Lateral Access Cleanout Includes technologies that due to their size and material make up are installed from a cleanout to the mainline sewer Manhole Access Pit or Cleanout Includes technologies that due to their size and material make up are installed from the mainline sewer to a cleanout or access pit 19 E 3 DEFINITION OF MANHOLE PARAMETERS The manhole parameters can be defined by clicking the Need Help links next to their names on the input screens The following parameters are defined below condition infiltration inflow corrosion structural deficiencies bench repair invert repair and collapse E 3 1 Condition General Maintenance The manhole is considered structurally sound with little indication of settlement cracking or other signs of structural
12. e 2 Soft Clay h Soil Type 2 is the dominant soil along 35 A A percent of alignment Soil Type 3 Gravel Soil Type 3 is the dominant soil along 25 A percent of alignment For the Pipe Installation Details specify the Allowable Extent of Excavation as Access Receiving Pits Only since the project is on a golf course and select Vitrified Clay Pipe as the pipe material and click Next to go to the Risk Analysis Input the Pipe details below Please specify the allowable extent of excavation Access Receiving pits only Please specify the new pipe material s Press Ctrl for mutiple selections Ductile Iron PWG Fiber Glass Reinforced Plastic High Density PE Medium Densit Vitrifed Clay Pipe C 1 3 Risk Analysis Although only one method was found to be technically viable the risk analysis will still assign a level of risk relative to the project data To begin the risk analysis input the SET Criteria by selecting one option from each of the three categories based on your experience Specifications availability National ASTM for Microtunneling Slurry owner s Experience Some for Microtunneling Slurry and method Track Record More than 5 Years for Microtunneling Slurry After selecting one option from each category go to the Weight Adjustment section and assign a weight to each of the six risk factors based on their importance in relation to the project under consideration 1 suitable installation
13. e Ris Risk Score pm Te feo Y Modify Risk Analysis input 4 suitable rehabilitation method s were found Category Method C 3 CASE STUDY 3 C 3 1 Problem Selection TAG 1s also capable of identifying suitable manhole rehabilitation methods based on standard condition assessment data The evaluation is based on the following conditions level of infiltration inflow level of corrosion structural integrity and the condition of the bench and invert This capability is demonstrated by assessing the following project undertook by the City of Columbus in 2003 C 3 2 Project Input Segment 1 of the Franklin Main interceptor sewer consists of 580 m 1900 ft of 600 mm 24 in vitrified clay at depths of up to 5 m 15 ft that was originally constructed in 1913 The sewer extends through heavily developed residential areas and is adjacent to the Olentangy River Review of CCTV images revealed that between a third and a half of the sewer cross sectional area was filled with debris The maximum ovality in the host pipe was less than 10 and the pipe was considered to be only 12 partially deteriorated It was also decided that by passing of the line for the duration of the project was doable There were no significant bends greater than 12 in the host pipe or cross section transitions The design report concluded that the entire length of the pipe should be rehabilitated using CIPP and each of the existing manholes rehabilitated
14. erforms a preliminary screening aimed at eliminating technologies unlikely to meet the project s technical requirements A technical evaluation is then undertaken during which the technical capabilities of various technologies identified in the first step are compared with the project s attributes Next a risk analysis is performed 1f a new alignment or inline replacement is considered based on the characteristics of the project s environment and anticipated soil conditions Finally the recommendations of the program are shown with their respective risk score s 1f applicable A 2 SYSTEM REQUIREMENTS TAG Online is compatible with Microsoft Windows Internet Explorer A 3 ACCESS The web address to access TAG Online is lt http 138 47 78 37 rtag gt The user is asked to enter a Username and Password The temporary login information 1s given here and is followed by screen shot of the login page Username ttc Password ttc123 Username Password MO Supported Web browser Internet Explorer 5 5 Recommended screen resolution 1024x768 or higher Adobe Flash plugin required To download here B CONSTRUCTION METHOD DATABASE B 1 STRUCTURE The relational method databases contain a plethora of information about each method The general information section includes a detailed description and a representative color picture The method s technical capabilities include maximum and minimum pipe diameters maximum and
15. he risk score measures of the owner s level of comfort with the method direct experience method s track record and availability of specifications and the potential adverse impact on the natural and built environments A user might choose to give all contributing parameters an equal degree of importance 1 e weight or different degrees of importance In some cases the user might choose to completely ignore some of the parameters Adjusting the importance of a given factor is accomplished by dragging the handle on the sliding bar with the mouse As an example let us assume that the owner in Case Study 2 has an established working relationship with a competent and environmentally conscious HDD contractor Thus the owner wishes to re run the analysis giving lower weights to the four technical aspects The following screen shot shows the SET Index and Environmental Impact factors set to 100 or high importance while the remaining contributing factors are set to 20 or low importance 14 Please apply the appropriate Weight to each risk parameter based on dis importance to you Risk Factor Weight Assignment Compatibility Environmental Impact Diameter Ratio Length Ratio SET Index Depth Ratio Index The impact of modifying the weights of the contributing factors on the risk final score is shown below The same five construction methods were identified by the program However the risk score for HDD Midi was decrea
16. iminary screening eliminating technologies unlikely to meet the project s requirements A technical evaluation is then undertaken during which the technical capabilities of the various technologies identified in the first step are compared with the project s requirements The TAG R program takes into account extensive performance data for a number of technologies and sub technologies for access point to access point pipe renewal a number of spot repair technologies and manhole renewal methods commonly used for pipe renewal projects TABLE OF CONTENTS Ar RINT COIN AA PP POUR E A 3 Astle BACKGROUND osetia tee ech oars sence ered ue each sateen as 3 7s sommes OO BN Wd REQUIREMENTS rta 3 A Ol wis A A II SPEER LD a TR RECN OPENER ADEE OMAP RR SORT ERIE IE OEE TOT 3 B CONSTRUCTION METHOD DATABASE 40 a 4 BL Alc oe Oe e e eb eta 4 E A AAA II O IN eee NP Ie eng re Pere 5 Salle ASE SLU al ST 5 2 A is E T 5 C A A A EOL SNe en Pere 6 Gekon O E A O AS 8 Ce A RS E ER 9 DA DA IS A A E 10 C 2s SA A eaten eds 10 EZ Propecia ad dados 10 O UES ares eras Sects a Ss Sac sec ai es tee esse ese ee ses en pe eee 12 Co A ascents E E cae E T E 2 Cole PRODIEMT Ele CHO a a a a a r e S 12 Coe PO EMU ayaa e ek apace hc stares Band gatas es ices a Stee 12 II A A A II O OE ROE NE PUI E 13 DE RISIESCO ra E A TEC PATE sia coo oia O pao 14 Di COMPUTING A METHOD S RISK SCOR Estatal 14 Es APPRENDE esses escent sin gs evs rss iia 15 E 1 DEFINITION
17. ision NUCA s Trenchless Technology Committee commissioned the Trenchless Technology Center TTC to develop a straightforward and easy to use interactive software program for the evaluation of alternative construction methods that can be employed in the installation or replacement of buried pipes and conduits The program titled TAG Trenchless Assessment Guide was designed as a stand alone software to assist municipal and utility engineers in evaluating the technical feasibility of various traditional new installation open cut new installation trenchless construction and inline replacement methods for a specific project and is intended to be a companion to NUCA s Trenchless Construction and Rehabilitation Methods Manual 4th Edition Trenchless rehabilitation methods were not considered during the technical evaluation of a project by Version of the software but they were included in Version 2 of the software developed in conjunction with NASSCO called TAG R TAG Online combines NUCA s Version 1 with NASSCO s Version 2 to create the complete evaluation software TAG R takes into account extensive performance data for more than 70 construction methods commonly used in utility type projects The software emphasizes simplicity and practicality and limits input data to that which is readily available to utility engineers at the design stage of the project Based on the characteristics of the problem s facing the decision maker the software p
18. ls are input next Typical soil conditions in Calgary s down town area consists of river valley flood plain deposits a mix of medium sand 70 and gravel 30 As for the replacement pipe PVC and HDPE pipes were considered as the best options o ee if al Ma ir Input the details for the host pipe and the new pipe Please specify the allowable extent of excavation Continuous Excavations Please specify the host pipe material Vitrified Clay Pipe Does the existing pipe suffer from excessive sagging or misalignment Does the pipe diameter need to be increased by a factor greater than 2 5 No Please specify the new pipe material s Press Ctrl for mutiple selections Ductile Iron PWE Fiber Glass Reinforced Plastic 11 C 2 3 Results The detailed project data was input into TAG Online which identified static pipe bursting as the least risky construction approach TAG also identified structural cured in place pipe CIPP structural folded pipe and spiral wound lining as viable rehabilitation technologies for the pipe in question The City of Calgary initially selected static pipe bursting as the construction method of choice for this project but decided to opt for pneumatic pipe bursting once it was determined that no utilities were sufficiently close to be disrupted by the method and the project was completed successfully on time and budget Congratulations Category Method Relativ
19. minimum drive lengths etc Other technical information embedded in the database is the method s level of compatibility with ten common types of soil defined in Appendix E 1 compatibility with various common pipe materials environmental impact factor required extent of excavation groundwater table classification alignment accuracy profile accuracy ability to navigate bends ability to rehabilitate different deterioration levels etc All of the construction parameters are defined in Appendix E 1 Method Selection Sewer Rehabilitation Method CIPP Inversion Non Structural ethod Categor Max Drive Length m 750 Full Flow Control Yes Select a Category v Min Drive Length m 0 2 Pipe Transitions Yes Max Pipe Diameter mm 2700 Egg shaped Pipe Min Pipe Diameter mm 100 Box shaped Pipe 45 Bend Yes Ovality gt 10 Yes 90 Bend Yes Reverse Curvature res Fully Deteriorated No Pipe Access Cross section Reduction Small Traffic Impact Low High Capacity Loss None Product Manufacture Field Annular Grout No Description CE TUTORIAL C l CASE STUDY 1 This case history was taken from the J Edward Drain Interceptor Project in Westfield Indiana Due to the rapid growth of the town which 1s located about 24 km 15 m north of Indianapolis a new sewer system was required to satisfy the increasing volume of wastewater This particular segment considered was constructed in 2004 on a 175 m
20. r the design life of the rehabilitated pipe E 2 4 Cross Section Reduction Small A tight fitting field manufactured renewal system with no annular space between the host pipe and the new liner system Medium A loose fitting factory manufactured pipe inserted into the host pipe can be designed with or without the use of annular space grout Large A significantly smaller pipe inserted into the host pipe E 2 5 Pipe Access Manhole Includes technologies that due to their size and material make up can be installed directly through a manhole opening of the existing pipe Access Pit Includes technologies that due to their size and material make up cannot be installed directly through a manhole opening of the existing pipe E 2 6 Bends For bends not listed in the selection menu choose the next highest degree bend 18 E 2 7 Pipe Shape For other pipe shapes contact the product manufacturers directly E 2 8 Size Transition A cross section size transition may be encountered in a constructed in place brick pipe Some technologies can accommodate this type of size change A point repair where a smaller diameter pipe 1s installed to repair a larger pipe 1s not considered a cross section pipe size change and should be replaced before renewing the host pipeline E 2 9 Reverse Curvature When the crown of the pipe typically in brick pipe begins to collapse and forms a reverse curvature technologies that rely on an arch
21. se suggestions procedures and precautions should not be considered as an infallible method of installing underground utilities Accordingly there is no guarantee that the methods and procedures will be successful in all applications While the authors have done their best to ensure that the information in this manual is accurate no liability or responsibility of any kind 1s accepted by the authors the National Utility Contractors Association or the Trenchless Technology Committee NASSCO DISCLAIMER The decision by an Engineer Designer or Municipal Official decision makers of how to accomplish the renewal of a deteriorated buried pipe in an urban environment must be based on tangible parameters These parameters can then be assembled and inserted in a computer software program to create a tool that simplifies this decision process NASSCO and the Trenchless Technology Center TTC of Louisiana Tech have developed this comprehensive yet straightforward and user friendly interactive software for the evaluation of alternative renewal methods These methods can then be employed in the rehabilitation of gravity pipes pressure pipes laterals and manholes The software will emphasize simplicity and practicality and limits input data to those readily available to utility and municipal engineers at the design stage of a renewal project Based on the specific characteristics of the problem s facing the decision maker the software performs a prel
22. sed from 3 01 to 2 87 while all other risk scores increased This shows that the owner s comfort with an HDD contractor can effectively place HDD as the preferred method relative to the project data Category Method Relative Risk Risk Score IL Method Pipe Bursting Pneumatic IL Method Pipe Bursting Static E APPENDIX E 1 DEFINITION OF PROGRAM PARAMETERS Many of the method parameters listed in the construction method database are listed by their classifications which must be defined to fully understand the methods capabilities The following 15 parameters are defined below soil compatibility environmental impact extent of excavation groundwater table classification alignment accuracy and profile accuracy E 1 1 Soil Compatibility The construction method database contains soil compatibility information for ten categories of geological conditions with soil types being further quantified in terms of the number of blows per foot as per ASTM 1452 The geological conditions considered by TAG are Blows per Foot Blows per Foot Dense Cohesionless Soils N gt 30 Gravel Cobble Boulders iJ Sandstone o o o o Bedrock gt The compatibility of each construction method with the ten soil classes is designated as either Possibly Compatible P Incompatible N F 1 2 Environmental Impact The values for potential environmental impact are provided with a relative ranking in the construction
23. site would be a downtown area No Accessibility The installation right of way is not accessible over the entire length of the alignment An example of this site would be an airport runway or river crossing Se ee C 1 4 Results The results of the complete analysis are displayed on the Risk Scores page which contains all technically viable methods their respective values and risk classifications Congratulations catego Method Relative Risk Risk Score Modify Risk Analysis input Only one construction method was found to satisfy all of the project s technical requirements Microtunneling Slurry was considered to offer a relatively low level of risk potential for adverse impact when compared to project parameters Some other methods might be able to complete the installation described above but only Microtunneling Slurry is found to be viable based on the recommended and reasonable data found in the database C 2 CASE STUDY 2 C 2 1 Problem Selection The second case history is from the City of Calgary AB Canada which was trying to identify a suitable repair methodology for a deep sewer located in the downtown area Select the type of Construction you want to consider 9 Structural Problem Consider New Alignment Includes Open Cut Methods Y Consider Inline Replacement Y Consider Rehabilitation Does the number of repairs for the proposed line exceed 3 Yes No Capacity
24. tructural Deficiencies Yes Bricks are missing in a number of areas of the manhole with distortion of the manhole wall Concrete manholes with portions of the wall missing rebar s showing or missing No The manhole is generally in good structural condition E 3 5 Bench Repair Yes The manhole bench is cracked and deteriorated with sections missing bench does not exist or groundwater is infiltrating at the bench No The bench is generally in good condition and channels the flow in the intended direction E 3 6 Invert Repair Yes The invert is missing or eroded pipe running through the invert is fractured and dislodged or the elevation does not match the elevations of the incoming and outgoing pipe elevations No The invert is in good shape and directs the flow through the manhole in the intended direction The invert provides a smooth transition of flow from the incoming pipe to the outgoing pipe E 3 7 Collapse Yes The manhole wall has partially collapsed and requires that it be totally rebuilt with a structurally sound lining system or new structure No The manhole is a candidate for one or more of the many coating and or lining systems available 21
25. with cementitious linings to improve their structural integrity General Cases Does the manhole require maintenance a protective coating or structural renewal Structural Renewal Need help Does the manhole have Infiltration or Inflaw No Need help What is the corrosion level in the manhole No Corrosion Need help Does the manhole have structural deficiencies Yes Need help Invert Bench Repair Does the manhole bench require repair Need help Does the manhole invert require repair Need help Manhole Collapse Has the manhole collapsed Need help C 3 3 Results The program suggested that only CIPP or a Spiral wound liner could be used to rehabilitate the 580 meters of interceptor sewer in a single operation While identifying cementitious coating as a viable rehabilitation method for the manholes TAG suggested that several alternative approaches might also be deemed adequate for this project Name of Method Manhole Rehabilitation Method Cementitious Coating Manhole Rehabilitation Method Cementitious Castin Place Manhole Rehabilitation Method Epoxy Coating Manhole Rehabilitation Method Polyurethane Coating Manhole Rehabilitation Method Cured In Place Liner Manhole Rehabilitation Method FRP Inserts Manhole Rehabilitation Method Replacement 13 D RISK SCORE D 1 COMPUTING A METHOD S RISK SCORE This section provides additional insight into the mathematical
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