Pot Bearing Intsallation Feb 11

INSTALLATION FOR BEARING POT BEARING Alignment & preparation of concrete box-out 1. Before casting of the headstock, use template c/w wooden pads taped onto the 50mm x 100mm pvc pipe to form the box-out (recesses) for the bottom cast on anchorage.

2. The dimension of the cast in dowels would be as indicated in Herlcules drawings. The box-out diameter will provide at least 15mm tolerance for the alignment of the cast anchorage.

3. Setting out of the box out be checked and confirmed by the QA Engineer prior to positioning installation.

4. The box out and concrete surface area where the bearing is to be positioned should be cleaned and roughened prior to positioning installation 5. Position the bearing such that the cast in anchorages are contained in the concrete.

GROUTING OF BOTTOM PLINTHS (POT BEARING-FIXED) 1. Form a pool or bottom plinth using timber formwork. Ensure the dimensions of plinth are 50mm all round large then the bearing base plate. 2. Reconfirm the alignment and the level of the beam thence bearing; grout the box out then bed the bearing plinth in one operation. 3. Grouting was carried out using the hose feeding in from only one side to the other sides of the bearing to ensure all air is expelled from the beneath the steel plate 4. Pouring should be slow and constant until the grout level on all side of bearing approximate 5mm above the soffit of the bearing base plate. This is to allow the settlement of the grout.

Pre-installing the pot bearing before grouting the bottom plinth.

Unloading the sikagrout-215 and pressure pump equipments

Delivered the equipments to the top of headstock

Setup for the pressure pump & clean the surface of grout area

Insert the hose feeding to the bottom of bearing.

Pump the sika-grout slow and constant and prevent idling, the grout must be continuous

The grout shall 5mm above the soffit of bearing plate to prevent settlement of grout.

Leveling the mortar grout to get desire surface and level.

GROUT FOR ELASTOMERIC BEARING (FREE FLOW TYPE)

Box out the bottom plinth using timber formwork. Ensure the dimensions of plinth are 50mm all round large then the bearing base plate.

After release into the

mixing, stir lightly with a spatula for a few seconds to any entrapped air. The grout is then poured immediately prepared formwork.

The mix ratio for pourable with 4.0 liter per pack of 25kg Sikagrout-215

Placing the grout over the form work and maintain a continuous flow throughout to avoid interruption

Leveling to desired level and expelled the entrapped air

Final product of mortar bedding for free flow bearing

HACKING EXISTING CONCRETE (ABUTMENT A&B)

Concrete to be hacked

1000mm

Completed hacking work. Pending for water proofing work for the inner side of abutment wall.