Ársrit Verkfræðingafjelags Íslands - 01.01.1914, Blaðsíða 30

Ársrit Verkfræðingafjelags Íslands - 01.01.1914, Blaðsíða 30
30 I had at flrst 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 depth 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 ofl'. 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 supprstructnre. 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, witli 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 wilh a sliding- plate. The end girders have íixed 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 lliere. None of the bridges built prior to this one exceeded 2t 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 with engine-power, a circular saw, a serew-culting-machine, and an emery-wheel. Finaly a screw-press, worked by hand to straighlen iron. AU the machines and instrument were bought for account of the bridge. AU 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 16th 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 d. Scaffolding............................. 3738 13 e. Instruments and machines ............... 6593 22 f. Expenses of engaging workmen, their travel to and fro etc.................... 598 18 g. Superintendance......................... 1700 57 Total 38720 11 Additional expenses including painling the following spring etc................... 738 25 Total expense kr. 39458 36 Under item. e) are included expenses of purchas- ing and placing the above-mentioned instruments and machines employed in building the bridge. 2. On bnilding regulations for Reykjavik. A lecture given in the Association of Civil-Engineers in Iceland on Nov.^S'x11912,by Rögnvaldur Ó1 a fss o n, the architect. Ten years have not passed, since the building regulations of Reykjavik became valid, but already they are thought to contain many faults. In my opinion, the regulalions are good on the whole, regarded as the first attempt. But just during these years many and great changes have come to pass in these matters, especially in building and in public opinion concerning it. When the regulations were made, and for a long time after that, houses here were almost exclusively built from wood. But now wooden houses are becoming unfashionable and a »stone age« is rising. Therefore we must have the building regulations altered in order to make clearer provisions witli reference to the building of stone- houses, especially buildings from concrele and several things in conneclion there with. It seems to me not unlikely, that the members of the building committee shonld better know than most others, where the shoe pinches in these malters. I liave had a seat in this commillee for some years, and should wish to touch on several points, which I think should be settled in the building regulations. The Engineers’ Associa- tion seems to me in a better situation to support this cause and more likely to undersland il than most olliers, therefore I thought this the proper plaee for the discussion of this matler. Some years ago, I


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