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<br />~. <br />f>' <br />~ <br />~ <br /> <br />iii. <br />~. <br />~ <br />~. <br /> <br />( <br /> <br />Abutments: New concrete abutment at north end. <br />Trestle Removal: Approximately 55' at north end and 80' at <br />soutb end. <br />Salvage: Present deck plate girders and X~Bracing. <br /> <br />Estimate <br /> <br />$215,300 <br /> <br />b. Deck Support: Existing girders raised to form thru girders <br />with f1o~r beams. <br />Top Flange Bracing: Trapezoidal plate from floor beams to top <br />flange inside and extra width stiffeners <br />outside. <br />X-Bracing: Throughout bottom flange. <br />Piers: Extend present piers and footings. Add piers at south <br />end of last existing pier. <br />Abutments: As in a. above. <br />Trestle Removal: As in a. above. <br />Salvage: X-Bracing. <br /> <br />Estimate <br /> <br />$272,000 <br /> <br />c. Deck Support: 4 trusses with variable section. <br />X-Bracing: At 1/6 span points. <br />Sway Bracing: .Throughout top and bottom flanges. <br />Piers: As in ihl:. above except pier extensions not needed. <br />Abutments: As in a. above. <br />Trestle Removal: As in a. above. <br />Salvage: As in a. above. <br /> <br />Estimate <br /> <br />$287,400 <br /> <br />The following items are not included in the above estimates: Temporary <br />falsework, earth work, trestle adaption, salvage and contingencies. <br />Method a. was selected as the most economical and feasible' method of <br />alteration. A detailed estimate is shown in Table 2, appendix B. <br /> <br />12-13. Interim bridge facility. For the purposes of estimating it was <br />assumed that the portion of bridge supported by steel girders would be <br />temporarily supported by timber falsework while the new support system <br />is being built. The system used would be similar to that presently <br />employed to support the track at the most northerly and southerly spans <br />of the existing bridge. <br /> <br />',-.- <br />, ',' <br /> <br />39 <br />