Equipment

Equipment

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Monostrand Post-Tensioning System

DYWIDAG Monostrand Equipment

Stressing Data

Strand Capacity0.5 in12.7 mm0.6 in15.2 mm
Jacking Force (tons short) 20 tons 20 tons 30 tons 30 tons
Jack Stroke 8 in 202.3 mm 8¼ in 209.6 mm
Jack Weight 38 lbs 17.3 kg 87 lbs 39.5 kg
DYWIDAG Monostrand Equipment

An open throat, twin ram jack for stressing 0.5 (12.7 mm) or 0.6 (15.2 mm) single strand is suitable for stressing at tendon ends or at intermediate tendon anchors.

For tendon elongation greater than the stroke of the jack, the wedges are temporarily seated after partial stressing and the jack is recycled.

There are many stressing systems available from DYWIDAG. To obtain drawings of a system best suited for your particular project, contact your DYWIDAG representative.

DYWIDAG Monostrand Equipment

Note: Detailed operating and safety instructions are provided with all stressing units. Read and understand these instructions before operating the equipment. 

Tendons may be placed in bands or in a uniform distribution depending upon the structural requirements. 

DYWIDAG Tendons are cut to length, marked, coiled, and tagged for ease of handling and identifying in the field.

DYWIDAG Stressing Anchors and the Pocket Former assembly are normally secured to the forms using ring shank nails.
DYWIDAG Stressing Anchors and the Pocket Former assembly are normally secured to the forms using ring shank nails.
DYWIDAG Stressing Anchors and the Pocket Former assembly are normally secured to the forms using ring shank nails.
Where intermediate stressing anchors are used, the balance of the tendon length is left coiled adjacent to the completed pour until needed.
DYWIDAG Stressing Anchors and the Pocket Former assembly are normally secured to the forms using ring shank nails.
After strand tensioning is complete and the results accepted by the engineer, the strand extensions are burned off.

Steel Stress Level

Where required, strands are stressed to the maximum jacking levels shown. These are temporary forces applied to the strand to overcome friction losses. Maximum jacking forces must not be exceeded. After the wedges are seated, the stresses at anchorage or coupler locations shall not exceed anchorage values shown, while the maximum force in the entire strand shall be less than anchorage force given in the table.

The average final forces after all losses for typical installations are noted as effective forces. These values can be calculated more accurately for each project by the design engineers or DYWIDAG considering interactive time-depending losses: concrete shrinkage, creep, and steel stress relaxation.

DYWIDAG-Systems International USA Inc.

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