Our in-house construction design capacity allows us to customise the slab for every job, and we investigate multiple . Flat any size. Chair Height* Chair Height* (mm . The installation of this lightweight system is extremely quick. This provides an excellent double corrosion protection and very low friction losses. Direct Ship. Dead End Plate- All Sizes. Multiple connection details are available in both slip-on style or welded. 0. The key benefits and features for Corrugated Ducts are as per below: Wide range of diameter available (ID 40mm to ID 120mm) Get contact details and address| ID: 24621832673 Ducts are embedded inside a concrete structure to form a void for installing and. The prestressing steel applied corresponds to international standards EURONORM 138-79, ASTM A 416-85, BS 5896. 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 prestressing force is transferred to concrete by a rigid anchor plate. Thanks to its dimensions, it can be used also for very slim structures and is very flexible in coordination with rebar reinforcement. 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. Learn More. Post-tensioning is a method of producing prestressed concrete, masonry and other structural elements. Contact Us. Tight Radius (TR) duct offers both material weight reduction and durability combined with ease of installation compared to steel deviation pipes for profiled tendons. Grout Tube. Round Corrugated Duct - All . 2). Anchorages are another critical element. Post Tension-type tensioning anchors help to anchor and stretch the ropes. . thinner concrete member sizes and reduced rebar usage. It is available from 40mm to 120mm (OD measurements) and also customizable according to the length and diameter needed. GTI Flat/Oval Corrugated Plastic Duct GTI Flat Plastic Duct is available in a variety of sizes (see table). It also develops a bond between cables and surrounding concrete which fills the duct space and prevents water collection and freezing. Optimized sizes to comply with most PT systems. for this case, the cross-section area should be 2.5 the stand tendons cross-section area. 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. A tendon has anchors on each end to transmit the forces into the structure. They allow the slabs to be optimally loaded to suit each situation. Corrugated Duct can be used for service penetrations, post tensioning ducts and precast connections. A post-tensioning tendon consists of strands, duct, and anchorages. 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 . The tendon shown in part (a) is in the shape of a simple parabola in each span. 3) Placement of the anchorage block and jack. Bar Chairs play a vital role in post-tensioning to support ducting and create tendon profiles to specification before the concrete is poured. but it can accommodate up to 5 strands. Copyright HenanPrestressingEquipmentCo.,Limited All Rights Reserved. Phone (707) 822-7688. 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 . Pulled to force P, the tendon exerts a uniform uplift (PT) shown in part (b). All ducts, anchorages and accessories comply with the related industry codes and requirements of ACI, PTI, and fib. Therefore reducing the slab thickness can allow reduction in column sizes as well as depth . There are two main reasons for grouting the ducts of post-tensioned concrete members. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. 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 corrugated duct is used for introducing the strands wich are to be stressed once the concrete element is cured. Concrete Corrugated Post Tensioning flat duct Production Details - 78mm width raw material VSL post-tensioning systems are certified according to European Technical Approval which can be used in all EU/EFTA countries. 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. A post-tensioning tendon consists of strands, duct, and anchorages. 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. 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. 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. in addition, Its including all accessories for grouting. Corrosion Protection Duct System for grouted post-tensioning tendons made of HDPE or PP. PT Applications are: Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. 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. For Buildings: Housing, Commercial Buldings, High Rise Buildings. Furthermore, Stressing anchorage is the most common form of post-tensioning system. this ducts used for transverse post-tensioning. IP 4 SB Coupler. 2.032. Order) $32.00/Piece (Shipping) CN Liuzhou Xuanqiao Prestressing Force Machinery Co., Ltd. The thickness range is from 0.3-0.4mm. The system is involved in redistribution of cracks, if any. : 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. Relying on our long-lasting expertise in post-tensioning and stay cables, we have developed custom external tendon systems made of individually protected strands. Duct Thickness mm. 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. Flat metal making machine is a special machine to make f. Learn More Oval Flat Duct Machine GTI provides bonded post-tensioning systems and components worldwide. Post Tension Oval Flat Duct Henan Prestressing Equipment Co., Limited manufacture Post Tension Oval Flat Duct 1. 2. Copyright 2007-2022 VSL SYSTEMS /CZ/ Ltd. Czech Republic, All rights reserved. There are several design categories of post-tensioned bridges and their sizes and shapes vary drastically. One is to provide efficient bond between the prestressing steel and the concrete member so as to control the spacing of cracks at heavy overload. Unable to Add. Post tensioning is a technique for reinforcing concrete. There are two main types of posttensioning: unbonded and bonded (grouted). 1) Casting of concrete. Duct System: galvanized metal duct, HDPE plastic duct, curved type galvanized metal duct, flat duct, corrugated pipe. Long tendons may also have intermediate anchors along their length. 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. Fig 1: Grouting Vent and Nosel. A Post Tensioning Anchorages is a mechanical device, consisting of all components required. 4) Applying tension to the tendons. 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). Metal roofing are known to be durable, lasting between 30 to 50 years compared to the average lifespan . made up of steel strands housed in a duct, which is injected with cement grout after tensioning. Click here to let us know and we'll help you find what you're looking for. If permitted by the engineer-in charge, admixtures may be added to improve the performance of the grout. Ducts are connected to each other by an external screw coupling and sealed with PE tape. Hot melt adhesive lining provides 100% sealing according to IP 68 . 0. The straight length of the duct adjacent to the anchorage shall be in accordance with the post-tensioning system. 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. VSL post-tensioning systems use a unique system for anchoring the prestressing force. Post Tensioning Galvanized Pipe Making Machine Duct Manufacturing Machines. The duct is manufactured in a wide variety of diameters and custom lengths. 5.5KW Post Tensioning Duct Machine. 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; HDPE Sheathing duct is a corrugated duct produced from high performance PE4710 resin. Place additional wood brackets at these positions, if necessary, to distribute the load. Home; About Us; Products & Services. We manufacture/ supply smooth type flat duct. 3. A tendon will have anchors on each end to transmit the forces into the structure. Ratnam Infra Industries Private Limited - Offering Post tensioning Duct Coupler, in Hyderabad, Telangana. 0.5 GTI Zero Void Bonded Monostrand System, 0.6 GTI Zero Void Bonded Monostrand System. Round. Call. ducts diameter shall be 12 mm greater than the largest external bar or bar coupler dimension. Learn More Corrugated Duct Machine 1. This increases the ultimate strength of a structural member. 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. 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 Working procedures - key for quality Multistrand Anchorage Our Company Download Data Sheet After tensioning, the formwork can be immediately striped, which brings considerable savings in costs of support structures. Designers should consult post-tensioning system supplier product guides to ensure that multiple suppliers can satisfy the design. surface condition of the prestressing steel; the type, diameter and surface conditions of the duct and the installation 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. The system is available for both 0.5" and 0.6" tendon diameters and can provide a critical level of durability for your structure. 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. STRUCTURAL TECHNOLOGIES has an array of specialized products and systems used to repair, strengthen and protect post-tensioned structures. 4-1/2" Post-Tensioning Duct. Longer lengths in coils are available for all sizes except 130mm. The corrugated duct is placed and tied manually to the . DHPS 2 Half Pipe. 0. 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. . Buy Post Tensioning Materials on ICSGlobe. 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. The Duct is available in 2", 3", and 4" diameter with couplings and reducer couplings for all sizes. Ready to Ship. Home; Round Corrugated Duct - All Sizes; PP Flat Plastic Duct - All Sizes November 28, 2020. Get best price and read about company. 6) Cutting of the tendons. Read more. HDPE Sheathing duct is ideal for use in high corrosion prone areas and an excellent alternative to metallic sheathing ducts. One commonality found in al1 the designs involves their complexity. 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. Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Bonded slab systems allow for future modifications, such as drilling, coring, and openings. application of post-tensioning, which helped it to fine-tune the design of its UPS flat anchorage system. 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 The water-cement ratio for neat cement grouts should be generally 0.40 by mass or less. This is a great advantage and often the only solution for increasing the carrying capacity of the existing bridge structures. 20mm x 90mm (Smooth Flat Duct) November 28, 2020. Contact with us: call us: Mobile No: +8613673713569. with an exception for ducts placed by the pull-through method. 1. 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. For the unbonded system, each strand is placed within a HDPE pipe injected with grease, which provides another 2 stages of corrosion protection to strands. This style flat ducts is widely adopted in large span building, bridge, etc, because of its limited thickness of concrete layer. Ducts are made of either steel or plastic PT-Plus. 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. 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. 2022 GTI - General Technologies, Inc. All Rights Reserved. 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: Accessories. GTI Flat Plastic Duct is manufactured from polypropylene (PP) but can also be manufactured from high density polyethylene (HDPE) when requested. It is even possible to localise the point of tendons leakage. As the pressure in the press is released, the strands are automatically locked in the conical holes of the anchor head. Corrugated pipe or duct. 1 Piece (Min. VSL bonded slab post-tensioning system has been successfully applied in many projects of building and bridge engineering. Grout . for oval(flat) ducts. 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. 2. Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. The post-tensioning system consists of a flat duct filled in with 4 prestressing strands, and live or dead-end anchorages. Specialty items such as Segmental Couplers have raised the bar regarding protection levels of tendons in bridge construction. The prestressing steel applied corresponds to international standards EURONORM 138-79, ASTM A 416-85, BS 5896. "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." The strands always remain in contact with the anchoring wedges during the stressing operation. Corrugated plastic duct shall be used and shall conform to standard sizes where possible. All tension components for the systems are designed to . World leaders in post-tensioning technology. High quality with good performance. Anchorages and wedges are used to hold back the forces. A post tensioning duct is a cold formed steel hollow tube which houses the PT Cables. Don't see what you need? these ducts are made for 4 strands of 15.24 mm diameter. On the other hand, the optional system of PT-Plus plastic ducts offers many advantages compared to traditional steel ducts. Figure 1 illustrates the concept in its basic form. Standard shipping length is 12m. . 4. For Municipal Engineering: Railway, Highway, Over Head Fast Speed Way, Metro Way, High-speed Railway, etc. Post Tensioning Duct Machine. C&K Johnson Industries, Inc 1061 Samoa Blvd Arcata, CA 95521. the minimum internal clear dimension shall be 25 mm vertically and 75 mm horizontally. Segmental Bridge Coupler System for IP 4 Ducts used for pre-cast segmental bridge installations. No. Fax (707) 822-5813 The external post-tensioning may be also used for strengthening or fastening the structures of buildings, silos and reservoirs. 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 for oval (flat) ducts. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. Wobble due to installation (CLICK HERE to view the video on how to calculate Angular and Wobble Coefficients in unbonded post-tensioning tendons.) It is important to place the beam coils above the formwork brackets. The electrically isolated post-tensioning tendons are reliably protected even in the environment with a high occurrence of stray currents. Long tendons may have intermediate anchors along their length to allow for stressing at construction joints. This style Oval Duct Production Line is special designed for manufacturing flat ducts, used for PT ducting industry. Prestressing force is applied to the tendons after the casting and curing of surrounding concrete. . Office Hours Monday - Friday 8:00am to 5:00pm. Post-tensioned high rise buildings in . Corrugated Duct can be used for service penetrations, post tensioning ducts and precast connections. 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. . 22.86. 3. Depending on your business needs or on your customers' requirements, you may need to procure corrugated metals, galvanized roofing sheets, or steel roofing sheets. 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. . Please give us a call to quote your next post-tensioning project. Heat Shrink Sleeve for Post-tensioning. 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. The external diameter of monostrand tendons is 19 mm. Contribution of post-tensioning in the reduction of the effect of dead load on the member. The post-tensioning technique involves installing and tensioning tendons in a concrete element, thereby applying compressive stress to the material. Galvanized Flat Steel Duct 1. Get Price. The spirals surround too much concrete in the zone behind the anchor plate. 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. For post-tensioning, wire, strand or bar is installed and stressed to its intended forces AFTER concreting has taken place. 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. Post Tensioning; Bar Couplers . HVAC Services; HVAC Products; Quality Assurance . Steel strand (12.7mm typically) is pushed through the duct (known as tendons) and the concrete is poured. A post-tensioning tendon is a high-strength steel bar or strand bundle combined with anchorages, a duct and grout. For Projects: Mining, Piling, Foundation, Slope and Rock Reinforcement, Hydropower Station, Anchoring Engineers, Water Conservancy Project, Oil or Gas Tank, etc. to transfer the post-tensioning force from the prestressing steel to the structure. 300 Ben Fairless Drive Fairless Hills, PA 19030; 2211, 22th Floor,19th Buildings, DongFeng Road North And Fengle Road East, Jinshui District, ZhengZhou City. 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). 2) Placement of the tendons. In a bonded system, the tendons in the ducts are buried intside the concrete and grouted after stressing. . 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).
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