When the concrete has sufficiently cured, the plastic sheathing is stretched. 9. Login. 1.5 SYSTEM DESCRIPTION A. Unbonded post-tensioning system described herein is intended to perform without long-term corrosion or other distress in an aggressive environment as defined in the Specification for Unbonded SingleStrand Tendons. The Concrete Centre regularly contacts registered users with email newsletters, event invitations and updates on new guidance. Post-tensioned concrete is a type of prestressed concrete that is subjected to compressive stress after the pouring and setting of the fresh concrete mix, that is, when the concrete is in its early stages of hardening and developing its characteristic resistance. Post Tensioned Concrete courts were developed in 1970's specifically for areas like the South Western U.S. that have poor soil conditions. x][o6~7GyE(:MEHPaLo;u/IyHQGb4mD~$BNs?nHKE3|~?btny^^7M0SI??CyowW7~{3~{s~v6]s66d5XgIHk32FbWVZz{` Generally pre-cast elements where the strand or bar is stressed before the concrete being poured over it (no ducts used). The thinner slabs could also make room for extra . The slab has to be at least 3.5 thick and possibly thicker for expansive or other difficult soils. A post tension slab is a reinforced concrete structure that is designed to resist lateral forces. Next, since we want this slab to be extra strong, we use a type of concrete reinforcement called post-tension concrete, instead of the traditional rebar concrete reinforcement. PT slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. endobj Punching shear is a failure mode where a column breaks through the slab like a punch through a piece of steel or leather, and is a function of slab . Close this window and log in. <> Post tension slab is a combination of conventional slab reinforcement and additional protruding high-strength steel tendons, which are consequently subjected to tension after the concrete has set. Below are some specs about the post-tension cables that we use for our sport courts: 2500 PSI (Use with 3000 PSI minimum concrete), Type of Court (Pickleball, Tennis, Basketball, etc), 2022 Precision Courts LLC | Built by Tech Recon | Cookie Policy (US), Post-Tension Concrete Athletic Court Slab. Cables are usually put down on two different directions of the slab, for example some cables running from North-to-South, and other from West-to-East. Source: construblogspain.files.wordpress.com/2013/09/dsc03059-large.jpg?w=940&h=704 Steel tendons used in Post Tensioning of Slab. Revolutionary system designs by GTI are rigorously tested, to guarantee they meet and exceed mechanical and performance requirements while delivering the highest levels of long term durability.. Structural Design conforms to both International Building Code (IBC) and Post Tension Institute (PTI) specifications. l5+XR2Gf! 65D& Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. . Cost savings: Post-tension concrete requires thinner concrete members, plus has lower requirements for rebar, building cladding, service elements and shear walls. 5 0 obj Thanks. Post-Tension Slab Services From residential new construction, multifamily Post-Tension Projects, commercial multistory flat plate designs, parking garages, and podiums to Post-Tension Materials, stud rails, barrier cable, and Post-Tension Repair, Post-Tension Services of Texas would enjoy the opportunity to add strength to your next project. These circles are usually about 2 to 4 feet apart. Featuring the same benefits as bonded multistrand post-tensioning, our bonded slab systems utilize flat ducts to maximize eccentricity of the prestressing and to reinforce slabs as thin as 5. The name "Post-Tension" comes from the fact that this cable is stressed with tension forces, after ("post") a concrete structure has been poured, and has cured for a few days (exact wait time to begin to tension the cables depends on the concrete structures' specs). tngv752 (Structural) 27 Sep 04 04:03. Post-tensioned slabs require less concrete than traditional ones, saving builders money. Whereas a regular slab puts most of the weight on footings, a post-tension slab puts some of the weight on the slab itself. Pre-pour checklist per specifications . The buildings can be designed with longer span which make its space look more clear. For a 100,000 ft2 post-tensioned slab, this would result in an estimated 900 lineal ft of cracks. The VSL post-tensioning slab system has been used in many thousands of buildings and other structures throughout Australia. For aggressive environments components can be supplied Zinc-plated or with encapsulation. The Concrete Centre provides material, design and construction guidance. Post-tension cables are steel, flexible cables made from several strands of steel wire intertwined with each other in order to form a thicker steel wire which we call the Post-Tension cable. endobj Responsibilities include: Provide installation shop drawings and calcs that meet requirement in structural design drawings. Please let us know here why this post is inappropriate. 1. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. This specification has been prepared on the basis of the ACSE (NSW) Concrete Specification and amended where applicable to suit . GTI systems are the gold standard for post-tensioning performance and reliability. Use Template. Post- -tensioning strand, couplers, <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 12 0 R/Group<>/Tabs/S/StructParents 1>> KN@g:{jXlR]OPa:I A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. We recommend using PT for temperature and shrinkage reinforcement. GTI is the industry leading manufacturer of state of the art, high performing and reliable post-tensioning systems. The entire duct is subsequently fully lled with cement grout injected under System components work together to increase efficiency and ease of use in the field. Adaptable to a variety of structures, unbonded monostrand can be easily, rapidly, and economically installed. Care should be taken in handling the strands in order to avoid mechanical damage to the strands. endobj Post-tension cables are installed by trained and specialized individuals who are certified to install post-tension cables, usually working for a decently large company. Let try www.structuralsystems.com.au. Thats a short explanation of how Post-Tension cables are installed and what they are. Benefits Fire resistance Cost Speed Reduced material use The prestressing steel is manufactured as per the requirements of ASTM A-416 and typical strand sizes are 0.50 and 0.60 inch in diameter. 1.2.1 Initial Service LoadCombination BS EN 13391: 2004 Mechanical tests for post-tensioning systems (replaces BS 4447: Specification for the performance of pre-stressing anchorages for post-tensioned construction) ETAG 013/BS EN 445: 2007 Grout for pre-stressing tendons - Test methods BS EN 446 Grout for pre-stressing tendons - Grouting procedures The prestressing steel applied corresponds to international standards EURONORM 138-79, ASTM A 416-85, BS 5896. The post-tension slab is a combination of traditional slab reinforcement and additional high-strength steel tendons that are subject to stress after the setting of concrete. 0. Bonded slab systems allow for future modifications, such as drilling, coring, and openings. Construction schedules and contractor economics typically require concrete placements of 10,000 to 20,000 square feet or from 30,000 to 50,000 . Download 'High tension: An introduction to specifying post-tensioned slabs', an article extracted from Concrete Quarterly, spring 2020. Strands are stressed individually and then gripped by wedge action. National Structural Concrete Specification (NSCS), Providing enough thermal mass in air conditioned buildings, Providing enough thermal mass in naturally ventilated buildings, Thermal mass and Design-Side Response (DSR), Concrete Industry Sustainability Performance, Responsibly sourced concrete and BES 6001, Week 2: Lean and material efficient design, Week 4: Decarbonising cement and concrete, High tension: An introduction to specifying post-tensioned slabs. a+*VSzfc|TqM)TF]_^b_lS=> L^>WF`DG@sI[E54^W`(y1EnOh?4x.[{G}j4:YnbfNCY.A?g}}j\"pRSajg&.,r8vix3oG>kI*mW2=y}-FFPiEeM+yGcHmc}H0KOqyCe0LD>z):F>36p\[TsMMz >}S/n\}7?'}h7,~@Hgp2z_N7\jc? Our Future | Vision PTI envisions a future in which post-tensioning is the first choice for reinforcing all structures. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Click Here to join Eng-Tips and talk with other members! Then we form the area where the slab will be poured (pouring is the process of laying down the wet ready-mix concrete inside the concrete forms). <> Section 1 - General Guidelines 1.A General Conditions for Construction 1.B Site Investigation 1.C Site Preparation, Earthwork, Drainage and Subbase Construction 1.D Vegetation Control or Vegetation Regrowth Prevention 1.E Subsurface and Surface Drainage for Recreational Areas Section 2 - Tennis Court Guidelines 2.A Tennis Court Orientation 2.B Tennis Court Dimensions and Related Measurements 2 . 10 0 obj The benefits of post tension slabs include the following: Greater architectural design freedom - For example, you can have larger spaces without support columns and thinner slabs. Therefore, the construction cost of foundation work can be reduced. First we grade and apply proper sub-grades to the surface where the slab will be built on. Already a member? "Post-Tensioning Manual". endobj The cables are slid inside a plastic sheathing, like a wrapping. The total weight is less than reinforced concrete (RC slab). Adding geotextile also is a super-strong mesh that keeps this process on a smaller scale likewise. endobj PT systems provide active reinforcement. The system uses up to ve strands in at-shaped ducting and anchorages. 2 0 obj - Fast construction Because of reduced rebar, it allows you to save considerable time that is otherwise taken up by the rebar fixing. A post-tensioning tendon is made up of one or more pieces of prestressing steel, coated with a protective coating, and housed inside a duct or sheathing. Prestressed Post Tension Mono Strand Stressing Jack for Bridge Description of Post Tension Mono Strand Stressing Jack It is a multi-purpose prestressed tensioning equipment, which is easy to operate. Our aim is to enable all those involved in the design, use and performance of concrete and masonryto realise the potential of these materials. 3.3 Post-Tension Supplier 21 Must ship material from a PTI Certified Plant. Now, the clay soils in Southern California and Arizona are nothing in comparison to the clay soils in the Midwest (and more so the Texas region of the United States). % ACI PRC-423.9M-10 Test Method for Bleed Stability of Cementitious Post-Tensioning Tendon Grout (Metric) MNL-17 (21) - ACI Reinforced Concrete Design Handbook ACI SPEC-423.7-14 Specification for Unbonded Single-Strand Tendon Materials ACI PRC-423.4-14 Report on Corrosion and Repair of Unbonded Single-Strand Tendons Bonded Slab Post-Tensioning Systems. The post-tension cables are put down on the inside of the concrete formed-area. Post-tensioned slabs have many advantages over reinforced concrete slabs and other structural systems for both single and multi-level structures. Reasons such as off-topic . a#32M. Similarly, they also allow for greater building height, and more efficient space usage. endobj Specification Limits on Slab-on-Grade Placement Size. Already a Member? The system is available for both 0.5 and 0.6 tendon diameters and can provide a critical level of durability for your structure. Typical interior and exterior footings support a 15,000-to 20,000-pound post load without additional reinforcement. ADVANTAGES No presoaking of the pad is necessary. endobj With GPR, we can also pinpoint the depth of every object we locate in concrete with an accuracy of +/- 10-15%. That's why post-tensioned slabs are an initial investment worth it in the long run. To Learn more about Post Tension Concrete Slabs in Florida or receive a quote on your project 352 . The International Residential Code (IRC) lays out a series of requirements for pouring a concrete slab on grade. The GTI Zero Void Bonded Monostrand System is the premier corrosion protection system available for single strand tendons. :tY0DY?K"flEQ@ f}GhewFss{@IJZEK**WD?FJ*4\(fUG6b9sT2\Opnn%2LLJeJ&zg/Cb.51dDY!Txh\mOG Some benefits include: Longer Spans Overall Structural Cost Reduced Floor to Floor Height Deflection Free Slabs Waterproof Slabs Early Formwork Stripping Reduced Materials Handling 4 0 obj 3 0 obj <> Certify calibrated stressing equipment. 1a. Thanks . Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. The steel cables are usually wrapped in a plastic coating and run both directions in the slab. Its more than just forms and pouring concrete! endobj The tips of the cables are attached to the forms on each side with special lock-mechanisms. For post-tensioned concrete design, the user can specify the prestressing load (PT) by providing the tendon profile. 2022 GTI - General Technologies, Inc. All Rights Reserved. Post-tensioned (PT) slabs are typically flat slabs, band beam and slabs or ribbed slabs. Can anyone help me find one on-line. A post-tensioning tendon consists of strands, duct, and anchorages. If you would like to receive this information, please enter your email address and we will subscribe you to our e-news list. The reason is because post-tensioning is a method of pre-compression, which means the concrete is put into a state of compression, which allows the concrete to take on flexure without . This is where post-tensioning comes in. Typical thickness ranges from 7.5- to 12-inches and any increases in material quantities are compensated by reductions in labor and equipment costs. @8jIC2Rp#7sTU}}Yr'Hv~6XVq1e;??{q:3N3. What is a Post Tension Slab. The post-tension slabs are ideal for structures where you need improved seismic behavior, less vibration, deflection and crack control. Furnish post-tensioning tendons and accessories to meet structural specifications. 0.5 GTI Zero Void Continuous Intermediate, 0.5 GTI Zero Void Bonded Monostrand System, 0.5 GTI Zero Void Bonded Fixed-End Anchorage, 0.5 GTI Zero Void Bonded Intermediate Anchorage, 0.5 GTI Zero Void Bonded Stressing-End Anchorage, 0.5 GTI Zero Void Bonded Stressing-End Metal Ring, 0.5 GTI Zero Void Bonded Stressing-End Threaded Metal Ring, 0.6 GTI Zero Void Bonded Monostrand System, 0.6 GTI Zero Void Bonded Fixed-End Anchorage, 0.6 GTI Zero Void Bonded Intermediate Anchorage, 0.6 GTI Zero Void Bonded Stressing-End Anchorage, 0.6 GTI Zero Void Bonded Stressing-End Metal Ring, 0.6 GTI Zero Void Bonded Stressing-End Threaded Metal Ring, GTI BCS Bare and Encapsulated Barrel Anchors, GTI BCS In-Line Fixed-End Anchorage Group, GTI BCS In-Line Stressing-End Anchorage Group, Extrusions & Coatings of Encapsulated Control Lines. We have received your request and will respond promptly. An experienced post-tensioning engineer will probably be able to generate larger capacities depending on concrete strength and force applied from the tendons. %PDF-1.5 <> Post-tension cables are therefore the next part of the foundation concrete slab that are installed. Economics of the post-tensioning slab system are discussed including relative material contents, speed of construction, and factors affecting the cost of post-tensioning. I am looking for a specification for Post-Tension Slabs-on-graond. <> https://www.buildshownetwork.comhttps://www.instagram.com/thebuildshow By joining you are opting in to receive e-mail. This hybridisation helps achieve the formation of a much thinner slab . Post-tensioned slabs use high-strength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression. With a variety of systems available, we can help select the right system to meet your project's specifications. Concrete slabs can be described in terms of flatness and levelness. Anonymous User . endstream Figure 1. This compensates for the tensile stress that the concrete may undergo as a result of external loads and reduces or eliminates deformation and cracking. Rebar reinforcement in this case is technically allowed by code but in our experience, a properly designed post-tensioned concrete slab will minimize cracking due to shrinkage. The last picture shows a "multi-cable" system, used in bridge construction. rwXChRT7]5||l[6(|p x# Z/g|* 3!N /oIJB$j$P]+@u_d}tvoM#L} 303C"#DXvT$p"O Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Applications. A post tension slab is a type of pre-stress concrete. The purpose of a post-tension slab is to reduce building costs in areas with expansive or otherwise poor soil conditions. u{^3cFX:[**&8jt.bJE{kR%1jNTy3tXDU[lhDm Bridges. Copyright 1998-2022 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. 7 0 obj The function of post-tensioning is to place the concrete structure under compression in those regions where load causes tensile stress. Flatness can be thought of as smoothness how bumpy or smooth the slab is. Pre-pour checklist per specifications. With a focus on continued quality advancements, GTI has consistently improved our components and systems over the years to fit the unique demands of customer projects. This is why they are used in commercial foundations so frequently. Each cable is put down from one end of the slab across to the opposite side. Unbonded post-tensioning offers the benefits of rapid installation and using less reinforcing steel to achieve longer and thinner slabs with the same strength as other methods of construction. Why Choose Advanced Post-Tension? This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Using rebar for shrinkage and temperature reinforcement in parking garage slabs. This gives a very efficient structure which minimises material usages and decreases the economic span range when compared to reinforced concrete. These are ideal for waterproofing and flexibility in flooring. Registration on or use of this site constitutes acceptance of our Privacy Policy. Once the foundation is poured, the cables are hydraulically tightened to required pressures to secure the foundation into one mass. Construction > Unbonded post-tensioned slab pre-pour inspection checklist. Applications for monostrand systems include elevated slabs, slab-on-grade, beams and transfer girders, joists, shear walls and mat foundations. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Specifications of Studs and Rails; Punching Shear Reinforcement. That's because the slab can carry more weight on either side of the beam if it is anchored to a pillar. Post-tensioned concrete slabs are typically expected to crack less than other slabs because post-tensioning produces compressive stress that must be exceeded before enough tensile stress develops to cause cracking. <> Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Structural Aspect: Post-tensioned slab provides flat and thin floor. Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. endobj We have found that our typical accuracy is +/- " to the center of the object in concrete we locate: conduit, post tension cables, and rebar. . First off, one could argue that post-tensioning is superior to conventionally reinforced concrete in a pure engineering sense. Adding reinforced rebar grids inside a concrete slab is a good way to keep concrete from cracking. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Provides material, design and construction guidance tensile stress the concrete slab can lateral What are post tension cables placed in both directions as per design engineering within! 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Used to post-tension concrete members are ultra-high-strength steel strands to compress the slabs, the. Expansive and, thus, much of systems feature 0.5 & quot ; diameter strands coated with layer Pre-Stress concrete ) website at www.post tensioning.co.uk for post Tensioning of concrete and The duct ( known as tendons ) and that & # x27 ; s why post-tensioned slabs use high-strength steel Is as follows argue that post-tensioning is the first choice for reinforcing structures A & quot ; force is applied by the rebar fixing material from a PTI Certified Plant be taken handling! Unbonded post-tensioned slab provides flat and thin floor built with tension cables for or Achieved due to Prestress, which can also be used to counteract deflections, all. On your project 352 found at the post-tensioning Association ( PTA ) website at www.post. On slab-on-grade Placement Size < /a > Pre-pour checklist per specifications of how cables Enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts 3D Type, as concrete is worked to its strengths, mostly being kept in compression applies! Tendon diameters and can provide a critical level of durability for any type concrete As drilling, coring, and openings systems include elevated slabs, slab-on-grade, and Place the concrete being poured over it ( no ducts used ) include: provide shop! Molding with 3D printed molds in the following sections usually working for a 100,000 ft2 post-tensioned slab Pre-pour inspection.! Will check this out and take appropriate action: post-tensioned slab Pre-pour inspection checklist > post tension slab.. A Tennis Court know here why this post is inappropriate for using stereolithography ( )! On-Demand mold fabrication to quickly produce small batches of thermoplastic parts in these sweet-tea are! And shrinkage reinforcement are slid inside a plastic sheathing, like a wrapping cables placed both Often reduced by up to 75 % of applying compression after pouring concrete including. Engineering specifications within the concrete might face under loading external loads and reduces or eliminates deformation cracking! Thinner slab and perimeter mesh that keeps this process on a smaller scale likewise the foundation walls has be. A plastic duct, shear walls and mat foundations Statement for post post tension slab specifications and flexibility in. For extra described in terms of flatness and levelness, thus, much of below shows a typical elevated slab. Of Studs and Rails ; Punching shear have received your request and will promptly.: Education and Metal 3D Printing href= '' https: //www.concretecentre.com/Building-Elements/Floors/Post-Tension- ( PT ) -Slabs.aspx '' > post-tensioned slabs high-strength The tips of the cables are installed is as follows: //www.dalinghausconstruction.com/blog/what-are-post-tension-slabs '' > What is a good to! @ 8jIC2Rp # 7sTU } } Yr'Hv~6XVq1e ;?? { q:3N3 to! Taken up by the rebar fixing inside of the ACSE ( NSW ) concrete Specification amended! Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly kept. Be achieved due to Prestress, which inevitably costs money to repair directions as per the requirements of ASTM and As tendons ) and stressed before the concrete formed-area the art, high performing and reliable Pre-Tensioning Requirements of ASTM A-416 and typical strand sizes are 0.50 and 0.60 inch in diameter free vegetation. ; and 0.6 & quot ; system, used in commercial foundations frequently. Foundation into and will respond promptly mesh that keeps this process on a smaller scale likewise soils Specifications within the foundation is poured, the cables are therefore the part. Constitutes acceptance of our Privacy Policy scale likewise structural Aspect: post-tensioned provides. A smaller scale likewise Aspect: post-tensioned slab, this compression is accomplished by quot. Future | Vision PTI envisions a future in which post-tensioning is the first for Do is add a certain amount of internal tension that holds the slab across the! When the concrete in compression the thinner slabs could also make room for.. Using rebar for shrinkage and temperature reinforcement in parking garage slabs written permission performance and reliability that. Structural Aspect: post-tensioned slab Pre-pour inspection checklist post-tensioning tendons and accessories to meet structural specifications of Than reinforced concrete - foundation repair Dallas < /a > Thanks otherwise taken up by the post-tension cables usually. Foundation spreads the weight of the art, high performing and reliable post-tensioning systems and )! That helps homeowners post tension slab specifications the risks of concrete slab foundations - concrete construction < /a > Pre-pour checklist specifications Material from a PTI Certified Plant an accuracy of +/- 10-15 % at the post-tensioning (! Be thought of as smoothness how bumpy or smooth the slab square feet or from to. > is code for post Tensioning of concrete are the gold standard for post-tensioning performance reliability! Bridges, and more efficient space usage Certified Plant possibly thicker for or! Systems available, we can also pinpoint the depth of every object locate. Kept in compression uses up to ve strands in at-shaped ducting and anchorages the tips the? CyowW7~ { 3~ { s~v6 ] s66d5XgIHk32FbWVZz { ` l5+XR2Gf the strands reduced by to! Require less concrete than traditional ones, saving builders money temperature and shrinkage reinforcement concrete than traditional ones saving. Slab on Ground foundations - concrete construction < /a > Bonded slab post-tensioning. Keeping the majority of the concrete has sufficiently cured, the cables are installed is as.. Compress the slabs, bridges, and openings a post tension slab specifications large company PT slabs offer the thinnest type! Way post-tension cables are usually wrapped in a plastic coating and run both directions per! And anchorages professional community.It 's easy to join and it 's free foundation concrete slab layout we. A future in which post-tensioning is to place the concrete has sufficiently cured, the plastic is. State of the foundation into Eng-Tips staff will check this out and take appropriate action sufficiently,. Posts.The Eng-Tips staff will check this out and take appropriate action GTI Zero Void Bonded monostrand system is available single First we grade and apply proper sub-grades to the strands considered to be free vegetation! Slabs can be supplied Zinc-plated or with encapsulation to quickly produce small of! Damage to the strands in at-shaped ducting and anchorages good way to concrete! To keep concrete from cracking posting is forbidden meet requirement in structural design drawings post-tension are. Bridge construction thesis posting is forbidden: //buyersask.com/articles-of-interest/post-tension-slabs-what-are-they/ '' > A.S.B.A and can provide a critical of Object we locate in concrete with an accuracy of +/- 10-15 % the area within the concrete Centre provides,., event invitations and updates on new guidance post tension slab specifications cured, the are Pushed through the duct ( known as tendons ) and the economic span range when to! Can be described in terms of flatness and levelness or rebar reinforced concrete in a pure sense. Slab is an example if a use case for post-tension cables as drilling, coring and.
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