Ársrit Verkfræðingafjelags Íslands - 01.01.1914, Blaðsíða 30

Ársrit Verkfræðingafjelags Íslands - 01.01.1914, Blaðsíða 30
30 I had at first intended to build the eastern pier in the same way, but it proved impossible to dig down the site to a further depth than 1,6 melres. As the current and the deplh of the water were in- considerable there, I resolved to cover the bottom with a layer of concrete, shot down through a funnel and then pump out the water from within the pile- planking. The layer of concrete was made V2 metre thick, and then the water was pumped out. The bot- tom proved tight and the pileplanking likewise, but on one side the water leaked in between the bottom and the planking, as it had been neglected to move the funnel once along by the side. Then the pier was built. A filling of stones was heaped up round the out- side of the piers. The western pile-planking was re- moved, but the eastern planking was too firmly fixed to be got loose, and so it had to bee left standing, but the tops of the piles were sawed off. On the out side of the piers all joints were trim- med. Covering piers with a layer of cement has been found to answer very badly (Thjórsá, Ölfusá etc). 3. The supprstructure. The length of the bridge is 92 metres, the breadth of the roadway 2,6 metres. The continuous girders are Gerbergirders wilh suspension links in the end spans, everywhere of equal height, with a Warren frame; the calculated height is 3 metres. The length of the panels varies from 2,75 metres to 3,625 metres. The middle girder is 40 m. long, and extends 5,5 metres beyond either pier. It has fixed bearings on the one pier but rests on the other with a sliding- plate. The end girders have fixed bearings on the abutments and are joined to the middle girder with suspension links. The superstructure was made in the govern- ment's Bridge-Building workshop at Reykjavik, this bridge being the first large bridgebuilt there. None of the bridges built prior to this one exceeded 24 metres in length and few and small instruments were used. But the building of this bridge necessitated the add- ition of several instruments and machines and a 6 HP electromotor to work them. The principal instru- ments and machines used were the following: Two drills, both worked wilh engine-power, a circular saw, a serew-culting-machine, and an emery-wheel. Finaly a screw-press, worked by hand to straighten iron. All the machines and instrument were bought for account of the bridge. All work at fashioning the separate parts of the bridge, and framing and erecting it, was done ex- clusively by Icelandic workmen, unused to the work. The work at the site began on the 16u» of May and was over on the 31st of August. 4. The Expenses were the following: kr. au. a. Substructure .................. 7084 92 b. Superstructure ............... 16983 59 c. Road to and from............... 2021 50 Scaffolding................. 3738 13 Instruments and machines......... 6593 22 Expenses of engaging workmen, their travel to and fro etc............. 598 18 Superintendance............... 1700 57 d. e. f. g- Total 38720 11 Additional expenses including painting the following spring etc............. 738 25 Total expense kr. 39458 36 Under item. e) are included expenses of purchas- ing and placing the above-menlioned instruments and machines employed in building the bridge. 2. Oii building regulations for Reykjavik. Alecturegiven in the Association of Civil-Engineersin lceland onNov. 22n<i 1912, by Rögnvaldur Ólafsson, the architect. Ten years have not passed, since the building provisions wilh reference to the building of stone- regulalions of Reykjavik. became valid, but already houses, especially buildings from concrete and several they are thought lo contain many faults. In my things in connection there with. It seems to me not opinion, the regulalions are good on the whole, unlikely, that the members of the building committee regarded as the first altempt. But just during these should better know than most others, where the shoe years many and great changes have come to pass in pinches in these malters. I have had a seat in this these matters, especially in building and in public commillee for some years, and should wish to touch opinion concerning it. When the regulations were on several points, which I think should be settled made, and for a long time after that, houses here in the building regulations. The Engineers' Associa- were almost exclusively built from wood. But now tion seems to me in a better situation to support wooden houses are becoming unfashionable and a this cause and more likely to understand it than »stone age« is rising. Therefore we must have the most others, therefore I thought this the proper place building regulations allered in order to make clearer for the discussion of this matter. Some years ago, I


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