![]() ![]() Pouring the new concrete before the bonding agent dries.Coating the footing surface with a bonding agent in order to achieve the required bond between old and new concrete.The diameter and number of steel bars should be according to the design. Fastening the new steel bars with the dowels using steel wires.Installing dowels at 25-30cm spacing in both directions using an appropriate epoxy material.Cleaning and roughening the concrete surface.Steps of Isolated Footing Strengthening An isolated footing is strengthened by increasing the size of the footing and the reinforcement steel bars as follows: To avoid this splitting of concrete, sufficient number of closed rings with sufficient overlap or welded connection should be provided around the footing. There can be a split of new concrete from the old concrete surface under the action of loads. Attention shall be given during construction in order that the excavations for the new "jackets" do not affect the existing adjacent foundations. The size of the "jacket" shall be selected such that the average maximum foundation pressure does not exceed the recommended allowable value. If the column is also being jacketed, the transfer of load from column to footing becomes easy. ![]() When the bearing area of footing is not sufficient, the size of the footing should be increased. This can be accomplished by drilling holes into existing concrete of footing and epoxy grouting the longitudinal reinforcement of jacket.Īnother possibility is to provide full anchorage length for longitudinal reinforcement by extending the column jacket at the top of footing. The new jacket should be properly anchored to the existing footing and column neck in order to guarantee proper transfer of loads. Widening and strengthening of existing foundations may be carried out by constructing a concrete jacket to the existing footings. □ Reading time: 1 minuteStrengthening of columns foundations is required in the case of applying additional loads.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |