DYWIDAG Bonded Post-Tensioning Systems Using Strands

Contents Contents 3 DYWIDAG Post-Tensioning Systems 4 Standard Strands 6 Corrugated Duct 7 PE/PP Round Duct 8 ETA Approvals 9 Anchorages 10 Overview 13 Installation

DYWIDAG Post-Tensioning Systems DYWIDAG Post-Tensioning Systems are world renowned for reliability and performance, most suitable for all applications in post-tensioned construction. They embrace the whole spectrum from bridge construction, buildings, to civil applications. The first ever structure built with a prototype DYWIDAG Post-Tensioning System using Bars was the arch-bridge Alsleben (Germany) in 1927. From that time on DYWIDAG has continuously improved its systems to keep up with the growing demand of modern construction technology. In addition to the traditional post-tensioning system...

DYWIDAG Post-Tensioning Systems

Standard Strands Strands are made from 7 individual cold-drawn wires, 6 helically wound outer wires and one center wire (king wire). The mechanical properties of the strand as well as corrosion protection properties are most important to DYWIDAG. For a maximum in corrosion protection we offer electrically isolated systems using polyethylene (PE) or polypropylene (PP) ducts. See also page 8. Strands are usually packaged in so-called coils that can weigh up to 3.5 tons. Technical Data Type after 1,000 h at 0.7 x Ultimate Strength fpk Specification Yield Strength fp0.1k Ultimate Strength fpk Nominal...

Corrugated Duct Metal ducts represent the most economical means to create a void for tensile elements. These thin-walled (0.25 - 0.60mm), ribbed sheet metal ducts provide a fair secondary corrosion protection with excellent bond behavior between tendon and concrete. Primary corrosion protection is provided by the alkalinity of grout and concrete. Dimensions of Corrugated Duct (Standard Sizes) Tendon Type The tendon type number (e.g. 5901, 6801) is composed as follows: the first digit (5 or 6) identifies the nominal strand diameter in tenth of inches, i.e. 0.5" or 0.6"/ 0.62", the last two digits...

PE/PP Round Duct Thick-walled polyethylene/ polypropylene plastic ducts provide long-term secondary corrosion protection especially in aggressive environments such as in case of waste water treatment plants, acid tanks, silos or structures exposed to de-icing salts. DYWIDAG-Systems International offers polyethylene/polypropylene ducts in straight lengths up to ≈24m for all sizes. Standard shipping length is ≈12m. Longer lengths in coils are available for all sizes except 130mm. Dimensions of Round Corrugated PE/PP Duct (Standard Size) Tendon Type 0.5" Wall Thickness Flat PE/PP Duct Tendon Type...

ETA Approvals Construction products with an European Technical Approval (ETA) meet all essential demands given in the Construction Products Regulation (CPR). The ETA holder is authorized to apply the CE-marking (Conformité Européenne) on his product. The CE-marking certifies the conformity with the technical specification and is the basis for the free movement of goods within the EU member states. DYWIDAG is proud to have European Technical Approvals for its PT-systems with bars, bonded strands and unbonded strands.

Anchorages Multiplane Anchorage MA The two-part multiplane anchorage is primarily used for longitudinal tendons in beams and bridges. The wedge plate and the multiplane anchor body with usually three load transfer planes introduce the pre-stressing force continuously into the member with minimal front area. The MA anchorage can be installed with and without helix reinforcement. The separation of anchor body and wedge plate makes it possible to insert the strand after casting the concrete. The wedge plate self-centers on the anchor body providing consistent assembly and installation as well as...

Anchorages Coupler R (Fixed Coupler) Coupler R is designed to couple on to already installed and stressed tendons. The coupler consists of a multiplane anchor body and a coupler wedge plate where the strands are overlapped. The continuing strands can be installed easily and independently. Fixed Floating Ultimate Load Coupler Coupler [kN] from to ✓ – 1,201 10,323 Coupler D (Floating Coupler) To lengthen unstressed tendons, e.g. in segmental bridge construction, coupler D is put to use. The splice chuck consists of two spring-loaded wedges that connect two strands individually. Fixed Floating Ultimate...

Anchorages Bond Head Anchorage HL/HR Primarily used with prefabricated tendons, it is also possible to fabricate this anchorage on site. The strand wires are plastically deformed to ensure a safe load transfer up to ultimate capacity in the area of the bond head proven in static as well as in dynamic applications. Depending on the boundary conditions either a rather flat or a bulky bond head anchorage pattern is available. Stressing Dead End Anchorage Ultimate Load Anchorage Accessible not Accessible [kN] from to – – ✓ 721 6,138 Coupler M/ME (Floating Anchorage Block) Rotation symmetric structures...

Overview Tendon Type 59… Anchorage Type Multiplane Anchorage MA Plate Anchorage SD Plate Anchorage Type ED Coupler R Coupler D Loop Anchorage HV Bond Head Anchorage HL/HR Flat Multiplane Anchorage FMA Other sized tendons on request Tendon Type 68… Anchorage Type Multiplane Anchorage MA Plate Anchorage SD Plate Anchorage Type ED Coupler R Coupler D Loop Anchorage HV Bond Head Anchorage HL/ HR Coupler M and ME Flat Multiplane Anchorage FMA Other sized tendons on reques

Slab with unbonded Strand Tendons External Wire Tendons Internal DYWIDAG Strand Tendons

DYWIDAG Form Ties DYWIDAG Bar Tendons

Installation DYWIDAG-Systems International has developed three different methods to insert strands into ducts. The selection of the insertion method depends on the boundary conditions of the structure and the job site. Method 1: Pushing To push strands into the duct on the job site is very economical and can be done either before or after casting the concrete. The pushing equipment can be installed remotely and connected flexibly to the insertion point. DYWIDAG strand pushers provide relatively high speed of up to 8 m/s and require minimal operating personnel of only two men. These advantages...