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Method Statement of UCONPT Post-Tensioning System

The Post-Tensioning system commonly used in building and bridge construction are grouped into two principal categories. These are the Bonded and unbonded system.

General :

UCONPT Post Tensioning System are developed and maintained by UCONPT Structural System Pte Ltd Singapore serviced and distributed to a worldwide network of subsidiaries owned by the UCONPT Corporation, Singapore.

Our system comply with international specifications and recommendations eg: ASTM, AASHTO, BS, EUROCODE, DIN, AUSTRIAN CODE, SIA, FIP, EOTA, IS CODE, etc. The quality of UPS products and services is in full compliance with the above.

This method statement has been developed to provide guidance for all personnel involved in the project in using UPS system which covers the installation, stressing and grouting operations.

Materials :

PT Strands :
Strands 0.50 inches 0.60 inches
Nominal Diameter 12.7mm 15.24mm
Nominal Area 100mm2 140mm2
Nominal Weight 0.775kg/m 1.102kg/m
Tensile Strength 1860N/mm2 1860N/mm2
Modulus of elasticity 195kN/mm2 195kN/mm2
Min breaking load of strand 183.7kN 260.7kN
Sheathings :

The sheathings for bonded tendons shall be spirally wound galvanized steel tubing made from galvanized steel strips of 0.3 mm thickness.

The sheathings shall be mortar tight to prevent entrance of cement grout during concreting and shall be corrugated for better bonding.

The sheathings shall be sufficiently strong to retain shapes and to resist damages during construction.

The round sheathings with various outer diameters from 68mm to 135mm have been widely used in UPS Multiplane anchorage system.

The sheathings used flat anchorage system shall be oval in shape with the dimension of 80 mm in width and 25 mm depth for accommodating 5nos of strand and 54 mm in width, 25mm depth for accommodating 3nos of strand.


The types of anchorage used are Flat Anchorage (FA), Multiplane Anchorage (MA), Coupler, Plate Anchorage and Bond Head (Dead End) Anchorage. The various types of anchorage are available to serve the different requirement of the projects. The purpose of the anchorage is transferring the tendon force to the concrete structure after the strands are stressed.

Anchorages used in this project shall be of flat anchorage (FA) & (MA) Types as the structural member intend to use is slab as well as beams.

Design data for friction / elongation calculation
Friction of coefficient, u 0.2 Or as per the consultant´s recommendation.
Wobble factor k 0.0017/m
Draw in of wedge 6mm
Stressing anchorage Type FA, MA and Coupler
Loss in jack Varies from 0 ~ 2.0%
Handling and storage of materials
General Work Procedures
Guidelines for Tendon Installation
Stressing :

Stressing shall not commence unless the main contractor has confirmed the concrete of the slab / beam has achieved the minimum cube strength at transfer.

Compressive Strength required for commencing stressing operation shall be 70% of the concrete grade used or minimum of 25 N/mm2.

Preparation for stressing

Stressing of Multiplane Tendons
Stressing of Flat Tendons

A sample of the Stressing Report and interpretation of stressing report are shown in Appendix A.4.

De-Shuttering at pour strip area can be carried out after completion of concreting in that area and after achievement of required compressive strength

Unbalance load from the floor under construction to be distributed with calculated spacing of props.

Stressing of Flat Tendons

Grouting shall not commence unless the consultant has approved the stressing result.

Preparation for grouting
Proposed grout mix
Tests for grouting
Viscosity test
Compressive strength test
Grouting of tendon
Precautions to be taken during grouting