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Vsl Lift-Off Tests, Demonstrating post-tensioning Sys Tendon lift-off Surveillance Equipment Capability
	ML19317G854
Person / Time
Site:	Rancho Seco
Issue date:	06/12/1974
From:	Swanson D; SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	;
Shared Package
ML19317G849	List: ML19317G848; ML19317G854;
References
	NUDOCS 8004010700
	Download: ML19317G854 (2)
	v • d • e

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O VSL LIFT-OFF TESTS e

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Date:

June 12, 1974 location:

VSL Production Division

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1077 Dell Avenue, Campbell, Cal' fornia t

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Tests witnessed by:

F. E. Abdon, Bechtel SFMO E.;.

..'3 H. R. Reuter, Bechtel Corporation VX

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A. J. Landler, Southern California Edison M

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L. Beraton, U. S. Atomic Energy Commission J. Garvin, U. S. Atomic Energy Commission C. P. Ton, U. S. Atomic Energy Commission G. Drew, Socramento Municipal Utility District J. Hiltz, Socramento Municipal Utility District J. Sullivan, Socramento Municipal Utility District E. Davis, VSL Corporation i

R. Friedrich, VSL Corporation l

D. Swanson, VSL Corporation 1

Materials:

Two ES-55 strand anchor heads with wedges, Fifty-five 1/2" 270K strands 30' in length, Lock stress material, CF&l Pack #3095 Physical Properties:

Available from SMUD.

Test

Description:

A 30' E5-55 tendon was stressed to 70% with a normal 1000-ton VSL stressing jack. At one end of the tendon the

~ strands protruding from the anchor head were cut so that the protrusion was 7-1/2" maximum. Tails were then slipped over the outside strands and seated into a VSL 900-ton lift-off jack.

The lock was then slipped onto the short protrusions. Pulling wedges were lightlytopped into place with a hammer and a 2x4. The jock was then loaded to 200 psi on the gauge and unloaded. Wedges were topped again by the same process as

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obove. The jack then loaded the tendon until lift-off could l

be seen. The jack was then relaxed and the pulling wedges removed. This process was repeated fifteen times.

Following is a summary of the test data.

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VSt Lift-off Trsts

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Juna 12,1974 Test Number of lift-offs T.ime Reniorks Number 1

11:15 cm 15 Removed jack and pointed wedges. There was no sign that any stressing wedges had been unsected during lift-off procedure.

2 1:55 pm 2

Removed jock, inspected point and fou id no sign of stressing wedges breaking loose.

3 2:20.pm 2

Removed jack and inspected point. There was no ' sign of wedges and anchor head breaking loose.

4 2:35 pm 1