What are the 2 types of formwork ties?
Form ties are majorly classified into two types and they are,
- Continuous Single Member type.
- Internal Disconnecting type.
What does form ties mean?
Form ties (sometimes referred to as tie bolts) connect opposite faces of wall formwork to restrain the applied concrete pressures. They transmit loads in tension between stiff vertical and/or horizontal members associated with the main formwork.
What are snap ties in a concrete wall?
Concrete form Snap ties are basically tension members. They are designed to resist the lateral pressure of fresh concrete on vertical forms. When properly fitted with cones or other they hold the wall forms at the proper distance to create the desired concrete wall thickness.
What is Dywidag bar?
Dywidag Prestressing steel is a high tensile alloy steel bar which features a coarse right hand thread over its full length. The system is proven worldwide and offers versatility in a range of applications.
What are snap ties used for?
Snap Ties are used to vertically form concrete walls that can have a wide variety of widths and heights. There are various systems you can use to create the form system you require depending on your needs. Snap ties make the installation of concrete formwork and the subsequent removal extremely easy and efficient.
What is done to break off snap ties?
The snap ties have indentations along each edge which allow them to be broken off after the forms are removed with the “snapped” end of the plate being slightly below the surface of the concrete.
How far apart should snap ties be?
Horizontal tie spacing: 2 ft., Outside Corner (O.C.), Strongback spacing: 6 ft., Outside Corner (O.C.)
What are Dywidag bar used for?
DYWIDAG Threadbar™ systems can be adjusted with ease for use as versatile tie rods. DYWIDAG Threadbar™ systems can transfer tensile forces and be used as tie rods. The systems can be adjusted on-site, independent of installation conditions or existing deviations or alterations.
What is a strand anchor?
Strand anchors are structural elements installed and grouted in predrilled holes in soil or rock to transmit an applied tensile load into the ground.
What are the 6 requirements for quality formwork?
Requirements of good formwork
- Strong enough to withstand dead and live loads.
- Capable of retaining its shape by being efficiently propped and braced horizontally and vertically.
- Joints should prevent leakage of cement grout.
- Should be capable of being removed in various parts without damaging the concrete.
What is most commonly used material for formwork?
Wood products
Materials used for the construction of concrete formwork range from traditional materials such as Timber, steel, aluminum, and plywood to nontraditional materials such as fiberglass. The systems used can be a combination of two materials. Wood products are the most widely used material for formwork.
Where do snap ties break off?
What is the main purpose of the cone on a snap tie?
The cones allow the snap tie to be broken off inside the concrete for surface patching. Features: One-piece ties are also called through ties because the rod extends through the wall and both form sides.
What does N16 bar mean?
The digits refer to the nominal diameter of the bar. For example, N16 has a diameter of 16 mm.
What is y bar reinforcement?
Rebar (short for reinforcing bar), collectively known as reinforcing steel and reinforcement steel, is a steel bar used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in compression.
What is a DYWIDAG form tie?
The DYWIDAG Form Tie System is based on the original DYWIDAG Threadbar with hot-rolled, continuous thread on both sides. Together with matching accessories, it is used by formwork manufacturers around the world and has proven itself countless times on jobsites.
What kind of thread do you use for form ties?
DYWIDAG Form Tie Systems 2 3 DYWIDAG Form Tie System The DYWIDAG Form Tie System is based on the original DYWIDAG Threadbar with hot-rolled, continuous thread on both sides. Together with matching accessories, it is used by formwork manufacturers around the world and has proven itself countless times on jobsites.
Where can I buy form ties and Concrete Accessories?
DY.CO supplies the widest range of materials for industrial, commercial, and residential construction across Europe here: DY.CO Outside the European region, DYWIDAG designs, manufactures, and supplies a wide range of form ties and concrete accessories, including taper ties, shebolts, and thru ties.
What are the safety instructions for form ties?
Safety Instructions Appropriate use of form ties and accessories is necessary to prevent accidents and failure. All products are intented to be used by qualified and experienced workmen. It is the user´s responsibility to continually inspect working hardware for wear and to discard worn parts.