The prestressing steel applied corresponds to international standards EURONORM 138-79, ASTM A 416-85, BS 5896. in addition, Its including all accessories for grouting. Anchorages and wedges are used to hold back the forces. Ducts are supplied in length of 5.8 m. The system of PT- Plus plastic ducts in combination with GC and VSL CS 2000 Plus anchorages meets the requirements of PL2 corrosion protection level fully encapsulated tendon; if combined with VSL CS 2000 Super anchors it meets the requirements of PL3 corrosion protection level monitorable, electrically isolated tendon (fib Report 33). Tendons of the multistrand VSL system may be made up of as much as 55 seven-wire strands of 15.7 mm (0.6S) in diameter with a guaranteed ultimate strength of 1860 MPa. We have the following items like Galvanized iron Ducts of various sizes 3s 5s 12s 15s and Couplers for ducts, Anchorages including wedges, and other post tensioning consumables For the Post tensioning projects in buildings, Silo, bridges and Ground Anchoring systems In a bonded system, the tendons in the ducts are buried intside the concrete and grouted after stressing. The stages are shown schematically in the following figures.After anchoring a tendon at one end, the tension is applied at the other end by a jack.The . Fine sand passing 150 mm IS Sieve may be added only for ducts of very large size. The corrugated duct is used for introducing the strands wich are to be stressed once the concrete element is cured. VSL post-tensioning systems use a unique system for anchoring the prestressing force. Direct Ship. ducts diameter shall be 12 mm greater than the largest external bar or bar coupler dimension. Corrugated Duct can be used for service penetrations, post tensioning ducts and precast connections. Learn More. with the standard of care for post-tensioning loss calculations. Tendons of the multistrand VSL system may be made up of as much as 55 seven-wire strands of 15.7 mm (0.6"S) in diameter with a guaranteed ultimate strength of 1860 MPa. 0.5 GTI Zero Void Continuous Intermediate, 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 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. Bar Chairs play a vital role in post-tensioning to support ducting and create tendon profiles to specification before the concrete is poured. The objectives in grouting a tendon are twofold: The complete filling of all cavities in the post-tensioning tendon prevents moisture from accumulating in the structure, which may result in corrosion and development of cracks in the structure during the freeze thaw cycles. The corrugated duct is placed and tied manually to the . The water-cement ratio for neat cement grouts should be generally 0.40 by mass or less. IP 4 SB Coupler. Through the years the post-tensioning industry has grown and matured, and JI has continued to grow with it. Chair Height* Chair Height* (mm . The following values may be assumed for design: Tendon in conventional steel ducts : = 0.20 Tendon in PT-PLUS duct : = 0.14 A loss due to wedge draw-in of nominally 6mm occurs at lock-off . Bonded Slab Post-Tensioning Systems 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. Post-tensioned high rise buildings in . VSL bonded slab post-tensioning system has been successfully applied in many projects of building and bridge engineering. these ducts are made for 4 strands of 15.24 mm diameter. Download Data Sheet GTI manufacture the highest quality plastic ducts for Bonded Post-tensioning Tendons in a variety of shapes and sizes along with corresponding connection, couplers and grouting accessories. 5) Seating of the wedges. The monitoring of corrosion protection integrity through this method can be conducted anytime during the life cycle of the structure. The system is involved in redistribution of cracks, if any. To-date, UPS Bonded Post-tensioning System has been used extensively in the construction of buildings and civil engineering projects in South East Asia, India, Sri Lanka, The Middle East and Africa. Duct Diameter mm. 3. GTI Flat Plastic Duct is manufactured from polypropylene (PP) but can also be manufactured from high density polyethylene (HDPE) when requested. Wobble due to installation (CLICK HERE to view the video on how to calculate Angular and Wobble Coefficients in unbonded post-tensioning tendons.) 2.032. The strands always remain in contact with the anchoring wedges during the stressing operation. Grout Tube. 2022 GTI - General Technologies, Inc. All Rights Reserved. to transfer the post-tensioning force from the prestressing steel to the structure. 5.5KW Post Tensioning Duct Machine. 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. PT Applications are: made up of steel strands housed in a duct, which is injected with cement grout after tensioning. . For post-tensioning, wire, strand or bar is installed and stressed to its intended forces AFTER concreting has taken place. It also develops a bond between cables and surrounding concrete which fills the duct space and prevents water collection and freezing. C&K Johnson Industries, Inc 1061 Samoa Blvd Arcata, CA 95521, Office Hours Monday Friday 8:00am to 5:00pm, Email: General ckjohnsonind@gmail.com Marketing ckjohnsonind@gmail.com Estimating ckjohnsonind@gmail.com Human Resources kayjohn45@yahoo.com, California Public Utilities Commission (CPUC)NCSPA-National Corrugated Steel Pipe AssociationAWS-American Welding Society (Certified Welding Fabricator)AISC-American Institute of Steel Construction, 2022 C&K Johnson Industries, Inc, All Rights Reserved. There are several design categories of post-tensioned bridges and their sizes and shapes vary drastically. To ensure corrosion protection and to give adequate bond strength, the tendons are filled with suitable cement grout mix after complete stressing of the strands. As the pressure in the press is released, the strands are automatically locked in the conical holes of the anchor head. Hot melt adhesive lining provides 100% sealing according to IP 68 . but it can accommodate up to 5 strands. Fax (707) 822-5813 Accessories. 0.5 inch diameter = (41.3 kips) x (0.70) = 28.9 kips 0.6 inch diameter = (58.6 kips) x (0.70) = 41.0 kips If permitted by the engineer-in charge, admixtures may be added to improve the performance of the grout. 1. 2. with an exception for ducts placed by the pull-through method. Individual strands of tendon are prestressed one after another and subsequently grouted with cement mortar ensuring both the composite action with structure and corrosion protection. Relying on our long-lasting expertise in post-tensioning and stay cables, we have developed custom external tendon systems made of individually protected strands. Heat Shrink Sleeve for Post-tensioning. . Advantages of the FEF method (Method 1) are: It does not exclude any size or type of tendon; It places the responsibility for calculating losses in the hands of the PT supplier, who is most familiar with loss calculations in general, and for its own system in particular; Read more. 300 Ben Fairless Drive Fairless Hills, PA 19030; NPT Galvanized Spiral Metal Duct or High Density Polyethylene Duct meets all physical and structural recommendations for post tensioning duct as laid down by the Post Tensioning Institute (of the United States). It is important to place the beam coils above the formwork brackets. Don't see what you need? Contact Us. Post-tensioning applications include:- office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, water-tanks. Get best price and read about company. Round. The duct is manufactured in a wide variety of diameters and custom lengths. Dead End Plate- All Sizes. Ducts are connected to each other by an external screw coupling and sealed with PE tape. Applications Bridges Buildings If the duct is . Ducts are embedded inside a concrete structure to form a void for installing and. PRE-STRESSED & POST TENSION In House manufactured Anchor casting products & stressing blocks for mono & multi strand systems Smooth flat galvanized duct : 43mm, 50mm, 70mm & 90mm Round & flat corrugated duct in all sizes Anti-corrosion Fully Powder coated coated bar chairs to BS & AS standard PP Plastic clip on chairs for 3 & 5 strand duct Read more. This style flat ducts is widely adopted in large span building, bridge, etc, because of its limited thickness of concrete layer. The strands are contained in one flat duct (duct size: 20mm x 70mm) which is made of corrugated galvanized metal. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. Office Hours Monday - Friday 8:00am to 5:00pm. The GTI Zero VoidBonded Monostrand System is the premier corrosion protection system available for single strand tendons. Accessories. Buy Post Tensioning Materials on ICSGlobe. In comparison with the traditional reinforced concrete structures, future saw-cuts are not limited, the cut-off of post-tensioning tendon is possible without any further provisions, and the effect of prestress is lost only in the concerned span. Working procedures - key for quality 3) Placement of the anchorage block and jack. Afterwards, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned . Prestressing force is applied to the tendons after the casting and curing of surrounding concrete. Post Tension Oval Flat Duct Henan Prestressing Equipment Co., Limited manufacture Post Tension Oval Flat Duct 1. We are a world leader in post tensioning technology enabling faster construction, reduction in reinforcement, thinner and more flexible slabs, larger floor spans and fewer columns. Concrete Corrugated Post Tensioning flat duct Production Details - 78mm width raw material Corrugated pipe or duct. Thanks to the PT- Plus couplings with double sealing the duct is watertight, the friction losses are considerably reduced and fatigue resistance of tendon is considerably improved. Heat Shrink Coupler is a Tubing used for jointing the posttensioning ducts to ensure leak tightness of connections between two consecutive portion of duct. DYWIDAG-Systems International offers polyethylene/polypropylene ducts in straight lengths up to 24m for all sizes. the minimum internal clear dimension shall be 25 mm vertically and 75 mm horizontally. for single bar tendons. Franais; Round Corrugated Duct - All Sizes. 2. The normal sizes for the flat ducts is as following, 20mm*90mm, 20*80mm, 20*70mm, these three are the most popular in the present. What is post tensioning Post-tensioning is a method of applying compression after pouring concrete. Post tensioning is a technique for reinforcing concrete. Our in-house construction design capacity allows us to customise the slab for every job, and we investigate multiple . Segmental Bridge Coupler System for IP 4 Ducts used for pre-cast segmental bridge installations. The VSL Multistrand system comprises from three to fty-ve strands (either 12.7 or 15.2mm diameter), round duct and anchorages. This compensates for the tensile stress that the concrete may undergo as a result of external loads and reduces or eliminates deformation and cracking. this ducts used for transverse post-tensioning. Place additional wood brackets at these positions, if necessary, to distribute the load. HDPE Sheathing duct is ideal for use in high corrosion prone areas and an excellent alternative to metallic sheathing ducts. For Buildings: Housing, Commercial Buldings, High Rise Buildings. Post Tensioning Galvanized Pipe Making Machine Duct Manufacturing Machines. This provides an excellent double corrosion protection and very low friction losses. Flat metal making machine is a special machine to make f. Learn More Oval Flat Duct Machine The straight length of the duct adjacent to the anchorage shall be in accordance with the post-tensioning system. Post-Tensioning Repair Products. Multistrand Anchorage Our Company Click here to let us know and we'll help you find what you're looking for. The term prestressing is used to describe the process of introducing internal forces (or stress) into a concrete or masonry element during the construction process in order to counteract the external loads that . Post-tensioning systems will have to be developed and tested both internal (corrugated duct) and external (smooth duct) applications for each of the following: Department standard tendon sizes for designing and detailing consist of 0.6 inch diameter Copyright HenanPrestressingEquipmentCo.,Limited All Rights Reserved. thinner concrete member sizes and reduced rebar usage. The special shape achieves total adherence to the concrete element and to the grout used for filling the duct after the strands have been stressed. Furthermore, the system offers the possibility to monitor the quality of installed tendons through measurement of electrical resistance (impedance) between strands and rebar reinforcement of the load bearing structure. . No. Optimized sizes to comply with most PT systems. From the 10 Billion dollar Sakhalin project in Eastern Russia, to the new Bay Bridge right here in California C&K Johnson Industries duct plays a critical role in the post tensioning process. RELATED PRODUCTS (Call us: Mobile No: +8613673713569) Prestressed Anchor System The external diameter of monostrand tendons is 19 mm. Post Tensioning; Bar Couplers . AASHTO 5.4.6.2 stating the duct cross-section area shall be twice the tendons area. Tendons are fitted with a wide variety of live and dead anchorages and couplers according to the demands of different structures, concreting sections, or technologies. The tendons are contained in one round duct which is made of corrugated galvanized metal. for oval(flat) ducts. Specialty items such as Segmental Couplers have raised the bar regarding protection levels of tendons in bridge construction. Galvanized Flat Steel Duct 1. The number of strands per tendon can be from 7 strands up to 19 strands. . Single-strand unbonded post-tensioning system known as monostrand uses 15.2 mm (0.6) or at present mainly 15.7 mm (0.6S) diameter strands sheathed in a HDPE pipe with grease. A post-tensioning tendon consists of strands, duct, and anchorages. Post tensioning are generally classified into 2 category, namely bonded and unbounded. Prestressing by post-tensioning is generally of the bonded type, i.e. To provide an effective corrosion protection by completely filling the tendon duct with alkaline material (grout); To achieve an effective composite action so called bonding of prestressing steel with the structure. GTI provides bonded post-tensioning systems and components worldwide. The prestressing force is transferred to concrete by a rigid anchor plate. The PT Duct is cast into the concrete slab during construction. 3. Home; About Us; Products & Services. A post-tensioning tendon is a high-strength steel bar or strand bundle combined with anchorages, a duct and grout. Bonded slab systems allow for future modifications, such as drilling, coring, and openings. C&K Johnson Industries now provides over 1,000,000 feet per year of metal post tensioning duct to numerous projects in a variety of industries throughout the world. 2) Placement of the tendons. 4. 4) Applying tension to the tendons. application of post-tensioning, which helped it to fine-tune the design of its UPS flat anchorage system. Anchorages are another critical element. A tendon has anchors on each end to transmit the forces into the structure. Post Tensioning; Bar Couplers; Waterproof Concrete; HVAC System. A tendon will have anchors on each end to transmit the forces into the structure. Thanks to the ducts flat shape, the system maximally uses the limited static height of slab structures, thus increases the effect of the introduced prestressing. The tendon shown in part (a) is in the shape of a simple parabola in each span. Duct System: galvanized metal duct, HDPE plastic duct, curved type galvanized metal duct, flat duct, corrugated pipe. 3). All ducts, anchorages and accessories comply with the related industry codes and requirements of ACI, PTI, and fib. The custom flat ducts sizes can be achieved by the line. Figure 1 illustrates the concept in its basic form. the minimum internal clear dimension shall be 25 mm vertically and 75 mm horizontally. STRUCTURAL TECHNOLOGIES has an array of specialized products and systems used to repair, strengthen and protect post-tensioned structures. A post tensioning "tendon" is defined as a complete assembly consisting of the anchorages, the prestressing strand or bar, the sheathing or duct and any grout or corrosion-inhibiting coating (grease) surrounding the prestressing steel. This is a great advantage and often the only solution for increasing the carrying capacity of the existing bridge structures. For Projects: Mining, Piling, Foundation, Slope and Rock Reinforcement, Hydropower Station, Anchoring Engineers, Water Conservancy Project, Oil or Gas Tank, etc. GTI plastic post-tensioning duct sets the standard and offers the highest level of corrosion protection available for specified PT systems PL-1 through PL-3 as defined in fib and PTI/ASBI. Tight Radius (TR) duct offers both material weight reduction and durability combined with ease of installation compared to steel deviation pipes for profiled tendons. Order) $32.00/Piece (Shipping) CN Liuzhou Xuanqiao Prestressing Force Machinery Co., Ltd. The post-tensioning system consists of a flat duct filled in with 4 prestressing strands, and live or dead-end anchorages. $1,212.12-$1,290.32/ Piece. One commonality found in al1 the designs involves their complexity. Flat any size. They are provided with cold-rolled threads over all or a portion of the bar's length. Depending on your business needs or on your customers' requirements, you may need to procure corrugated metals, galvanized roofing sheets, or steel roofing sheets. C&K Johnson Industries, Inc 1061 Samoa Blvd Arcata, CA 95521. Round Corrugated Duct - All . The system is available for both 0.5 and 0.6 tendon diameters and can provide a critical level of durability for your structure. The key benefits and features for Corrugated Ducts are as per below: Wide range of diameter . The spirals surround too much concrete in the zone behind the anchor plate. They allow the slabs to be optimally loaded to suit each situation. The Duct is available in 2", 3", and 4" diameter with couplings and reducer couplings for all sizes. Designed for common flat duct sizes; 2-leg and 4-leg variants available; Chair Type: Product Code. Thanks to its dimensions, it can be used also for very slim structures and is very flexible in coordination with rebar reinforcement. Multiple connection details are available in both slip-on style or welded. UOM: FT. 1 Piece (Min. Standard shipping length is 12m. High quality with good performance. Get contact details and address| ID: 24621832673 The key benefits and features for Corrugated Ducts are as per below: Wide range of diameter available (ID 40mm to ID 120mm) VSL post-tensioning systems are certified according to European Technical Approval which can be used in all EU/EFTA countries. GTI manufacture the highest quality plastic ducts for Bonded Post-tensioning Tendons in a variety of shapes and sizes along with corresponding connection, couplers and grouting accessories. Common post-tensioning system component sizes and combinations are shown in Table 5.1.5-1. IP 4 Duct Couplers. Therefore reducing the slab thickness can allow reduction in column sizes as well as depth . Grouting mixture fulfils the valid EN 447:2007. Post tensnioning duct coupler. 20mm x 90mm (Smooth Flat Duct) November 28, 2020. surface condition of the prestressing steel; the type, diameter and surface conditions of the duct and the installation method. Contribution of post-tensioning in the reduction of the effect of dead load on the member. Corrugated plastic duct shall be used and shall conform to standard sizes where possible. The electrically isolated post-tensioning tendons are reliably protected even in the environment with a high occurrence of stray currents. We manufacture/ supply smooth type flat duct. The primary role of the PT Duct is to allow the PT Cables within it to freely move within the slab. This arrangement enables strand loads to be transferred to the concrete structure by bonding, which allows for passive reinforcement to be optimised and significantly reduced . The installation of this lightweight system is extremely quick. Williams PreStressing / Post Tensioning Systems consist of high tensile steel bars available in seven diameters from 1" (26 mm) to 3" (75 mm) with guaranteed tensile strengths to 1027 kips (4568 kN). Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. these ducts are made for 4 strands of 15.24 mm diameter. It is available from 40mm to 120mm (OD measurements) and also customizable according to the length and diameter needed. Coupler Variety to connect IP 4 ducts for grouted post-tensioning tendons. Post-tensioning is a method of producing prestressed concrete, masonry and other structural elements. Dimensions of Round Corrugated PE/PP Duct (Standard Size) Tendon Type 0.5" Wall Thickness Flat PE/PP Duct Tendon. On the other hand, the optional system of PT-Plus plastic ducts offers many advantages compared to traditional steel ducts. Post-tensioning is a method of reinforcement employing high-strength steel strands or bars, which enable the existence of longer clear spans, thinner slabs and in many cases of structural systems that would otherwise be impossible due to either site constraints or architectural requirements. Call. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. These tubes are manufactured from high quality Cross-linked Polyolefin material. 0. IP 4 Duct - PESTEC Germany IP 4 Duct Thick walled intermittent circular corrugated corrosion protection HDPE or PP duct system for grouted post-tensioning tendons complying to latest FIB, PTI and FDOT recommendations. HDPE Sheathing duct is a corrugated duct produced from high performance PE4710 resin. The joints between the duct and the anchor shall be watertight. Endot produces HDPE Sheathing Duct in standard sizes: 32 mm - 1.25" ID; 38 mm - 1.50" ID; 51 mm - 2.00" ID; HDPE Sheathing Duct Advantages: 2). Ready to Ship. A post-tensioning tendon is made up of one or more pieces of prestressing steel, coated with a protective coating, and housed inside of a duct or sheathing. Corrugated Duct can be used for service penetrations, post tensioning ducts and precast connections. Ducts are made of either steel or plastic PT-Plus. After tensioning, the formwork can be immediately striped, which brings considerable savings in costs of support structures. 4-1/2" Post-Tensioning Duct. : 3-5 This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. The system is normally adopted for bonded tendons that consist of a bundle of the strand with a nominal diameter of 0.5" (12.7 mm) or 0.6" (15.2 mm). The thickness of the wall shall be 2.30.3mm as manufactured and 1.5mm after loss in the compression test for duct size up to 160mm OD. 6) Cutting of the tendons. 22.86. All tension components for the systems are designed to . Pulled to force P, the tendon exerts a uniform uplift (PT) shown in part (b). 2.032. There are two main types of posttensioning: unbonded and bonded (grouted). Grout . A post tensioning duct is a cold formed steel hollow tube which houses the PT Cables. In many cases, post tensioning allows construction that would . For ducts of the bonded post-tensioning system, thin sheet metal pipes with claw coupling or welded overlapped seam supplied in lengths of 5 and 6 m respectively are used as a standard. Heavy equipment: bridge girder launching machine, drilling rig, bridge girder transporter. It is substantially "prestressed" during production, in a manner that strengthens it against tensile forces which will exist when in service. Long tendons may have intermediate anchors along their length to allow for stressing at construction joints. C&K Johnson Industries has been a leader in producing spiral steel multi-strand post-tensioning duct in North America for over 25 years. The system is available for both 0.5" and 0.6" tendon diameters and can provide a critical level of durability for your structure. Designers should consult post-tensioning system supplier product guides to ensure that multiple suppliers can satisfy the design. Our close proximity to the port of Oakland has given us the ability to ship product all over the world while maintaining quality and ensuring that costs are kept low. A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. A post-tensioning tendon consists of strands, duct, and anchorages. External post-tensioning is commonly used in bridge engineering, for example by reason of insufficient space available for tendons inside the structure, but especially with respect to a high degree of corrosion protection, the possibility to inspect tendons during their service life and easy replacement, if necessary. Why central prestressing is required during construction for incremental launching method for bridge construction. Longer lengths in coils are available for all sizes except 130mm. Grouting of the post-tensioned cables in the post or prestressed concrete is carried out to provide permanent protection to the steel cables against corrosion. Get Price. The thickness range is from 0.3-0.4mm. Unable to Add. World leaders in post-tensioning technology. After initial tensioning, the tendons of the bonded post-tensioning system are grouted with cement mortar, which protects strands against corrosion and ensures the co-operation of the tendon in every cross section of the post-tensioned structure. Phone (707) 822-7688. Post Tensioning Tendon. "The Slab Post-Tensioning System comprises high strength steel strands, up to six in number, placed inside flat ducting, typically anchored at one end by deforming the strand and casting it into the concrete then at the other end by means of a steel anchorage casting and anchor block (s) with gripping wedges." Contact with us: call us: Mobile No: +8613673713569. Steel strand (12.7mm typically) is pushed through the duct (known as tendons) and the concrete is poured. Item #: ETPT412 Post-Tension Strand/Metal Post-Tension Ducts Datasheet. The duct shall be . Figure 1. Steel Corrugated Duct for Bonded PT | TMG. this ducts used for transverse post-tensioning. . GTI Flat/Oval Corrugated Plastic Duct GTI Flat Plastic Duct is available in a variety of sizes (see table).
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