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20 CONSTRUCTION OF LOCK' 3, ERIE BARGE CANAL. BY OSCAR HASBROUCK, C. E., IN THE Engin- eering Record. Lock 3 is a good example of the general type of the miter locks used on the Barge canal. It is situated at Waterford, N. Y., and is one of the six locks, including the lock at ihe Troy dam, which constitutes the lift between the Hudson and Mohawk riv- ers against the 18 locks of the pres- 'ent Erie canal. It has the character- istic dimensions of 45 ft. between the face of walls; 328 ft. between hollow 22-50% see my STIFFENING AND BRACING Forms : Details of Forms Used at. quoinss and 12 ft. of water on the miter sill, and it contains 31,000 cu. yd. of concrete. between miter sills, or the lift, is 34.5 it# The water is fed into the lock by the main culvert well, which is located just ahead of the upper gate; from this it is led off into two culverts which run the length of both lock walls, having their intake above the 'upper ~ gate and outlet below ~the lower gate. At the end of each of the culverts there are valves for filling and emptying the lock. From each culvert' in the chamber walls 'there are 14 cast iron port pipes ott. in diameter, spaced 19.5 ft. apart, through which the water finds an inlet and outlet from the main chamber. There are also other appurtenances, stich as line hooks and ladders in 'the 'walls and capstans and shubbing posts' on the lock walls. The concrete is furnished by a Hains mixer situated about 500 ft.. from the lock and transported by three trains of © four cars each in Stuebner bottom- dump buckets, two to the car, to the site of the lock, one train being eS in the lock. The mixture is a 1: 2%: "to hoist forms and The difference in elevation: "each. _was to "be finished off, the concrete THe Marine REVIEW "and is mixed in six-bag batches,. the average run for the day being 250 batches, It is then hoisted into place by derricks, 'three being able to take care of the total output though there are five in all, the others being needed other materials when not in use for concrete. They are supplied with steam ftom a central boiler: plant. The floor of the lock was first con- structed along the lines -b b shown in the general section; this was laid in 16 ft. sections by setting templates to grade. The track was then laid over rae A A YA Y N N 4 Y UZ = Section of Lock | BS eK 2 Wedges driven qo0esed Bracine ar Top of Form Lock Three, Barge Canal. this. and the side walls commenced along the line a a, the grade being set to the floor of the culvert. As soon as the work had progressed sufficiently the port pipes were set and-concreted in. 'At the same time the side walls were being constructed, the breast wall and head wall were carried up. The side' walls were built up in 48-ft. sections, a tarred expansion joint being provided at the end of ~In "all ~cases. where a' floor was brought to that elevation and the part in question finished before work was resumed. The culvert linings 'to which the valves are fastened were 'set by low- ering the bottom plate in a soft bed of concrete and grout, and tamping them until they were thoroughly im- bedded and rested on their flanges on blocks set 'to grade. - When had sufficiently set, the were bolted on. The miter' sills were set to grade and line by resting them on small rectangular boxes, and the anchorages suspended from them. They were then concreted in, after which the boxes were removed and the Holes filled: side plates "was reached. 'planking nailed to studs, 'backed by two heavy timbers. 4° 4. 10 in. these The anchorages for the gates were. supported on chairs at the right ele- vation and line before concreting be- gan, as monolithic construction was required within certain limits. All other imbedded materials were sus- pended in position before their, grade The panel forms, which are thie unique feature of the work, consist of which are The general size is°5 x 12 ft, though different sizes were used according to their purpose. The standard panel consisted of five 2 x 12 in. planking 12 ft. long nailed to six 3 x 6 in. studs long, and these in turn bolted to 8 x 8-in. timbers 12-ft. long. The bolts were countersunk on the face of the studs and at the back on each end. ~When in use these were set one on each other and held in place by ~wedges driven behind the 8 x 8-in, pieces and between them. They were also supported 'by being bolted to -each other by two bolts and held in "dine by a 12° x 1234-in. steel plate © at the corners, each 'plate covering four panels and held to them by four lag screws. Through the center of each plate there ran a rod having a sleeve nut at. least 6 in. inside the form, at the back, it being bent down to the level of the panel below where it was fastened to the back form, 'an iron rod driven 'into the concrete, or a post imbedded in the concrete, according to whether it had a rock backing or not. The top was held to line by a wooden strut braced at the back against the rock, an imbedded post, or back form, and at the front against the upper half of the iron plate. iS The panels were brought into line from a 2-ft. offset. line with a transit, by either tightening the nut on the front of the plate or driving wedges, opposed to each other when neces- sary, between the end of the strut and the plate. All curved 'surfaces were con- structed by nailing 7%-in. ship lap over templates and holding it in place by rods and struts similar to the above. The above method has worked very satisfactorily, no giving away of forms having been' experienced. It is eco- nomical and is to be recommended: for use in heavy construction. The contracting is being done: by the Ferguson Constracting' Co. of New York, and the engineering by the department of state engineer and sur- veyor.