Reyjkavik Havn
Foredrag, Holdt I Dansk Ingeniørforenings Sektion For Vej-, Vand- Og Jærnbanebygning Den 5. April 1918

15 once bent and straightened 180° round a cylinder with a diameter four times the thickness of the piece, without showing the slightest damage. The heads of the bolts shall be square; they shall have a thickness equal to and a side 2Vs times longer than the diameter of the bolt. The nuts shall be hexagonal, and shall have a thickness equal to and a diameter twice that of the bolt. The washers for the nuts shall be square, with a side three times the diameter of the bolt and a thickness 3/io of the diameter. There must be no weldings in the bolts. All screw-worms shall be fashioned on the Whitworth system. Sharp angles must be avoided in the strappings. The iron plates for the clothing of the piles shall be of wrought iron, and shall bear being bent to a right angle across a sharp edge at a right angle to the rolling-direction of the plate without receiv- ing any damage. They shall be plane, equally thick all over, with perfectly straight and whole edges, and homogeneous in the mass. The nails used for fastening the plates shall be 8 cm. in length, forged, and shall have large and strong heads. Their weight shall be at least 8,5 kg. per 1000 pieces. The di- stance between the nails must nowhere be more than 6 cm. At the joints the overlappings must be 5 cm. in breadth; 4 plates mnst nowhere lie over one another. The overlappings shall be provided with two rows of nails, the distance between the rows and the nails of each row being 21/« cm. The plates shall tightly and nicely fit the sides of the tree. After being placed the plates shall be smeared twice all over with blackvarnish. All plates, nails, spikes, bolts and straps employed shall be galvanized (by dipping into melted zinc) with particular care. IV. Concrete. The cement used for the composition of the concrete must be the best Portland Cement from a recognized good factory, and must be in accordance with the usual conditions made for deliveries of cement in the Contractor’s country. The other materials used for the composistion of concrete shall be perfectly clean and homo- geneous, the best that are to be obtained in the neighbourhood of Reykjavik. The composition shall be in every respect carefully executed. V. Stone-materials and Stone-work. The stone-materials employed shall be fresh, sound and unweathered. The glacis-stones of the coping of the moles shall have a fairly plane surface, and shall be dres- sed in such a manner as to present straight, vertical joining-surfaces of at least 5 cm. They shall have a thickness of at least 1/2 m. The outmost stones on both sides, shall have a straight edge and an ad- justed face at least 30 cm. in breadth, flush with the slope. The glacis-stones shall rest perfectly firm and tight on a layer of pebbles and coarse gravel. As the bottom under the outer halfs of the Batteri-mole and the Effersey-mole is so soft that it will not be able to support the moles without considerable settlement, proper measures must be taken for consolidating the bottom in those places, so that considerable settlement and undermining along the moles may be avoided. The stones for the hearting of the mole shall measure from 5 to 20 cm. The stone-filling shall everywhere be separated from the large stones by a layer at least 1 metre in thickness of stones measuring from 20 to 50 cm. The steps in the EiTersey mole shall be made of rubble with rough dressed upper surfaces and faces. The retaining wall before the platform at the pier projecting from Hafnarstræti shall be built of rubble, which shall be laid in bond without any cementing. The foundation of the retaining-wall shall consist of stones measuring from 5 to 50 cm., but the outmost slopes shall, however, be faced with a 1 m. thick layer of stones measuring from 20—50 cm. exclusively. VI. Excavation. The work of excavation shall be executed in such a way, that the depth within the stated limits after the completion of the work be nowhere less than 5 m. below low-water level. The Contractor shall do further dredging inside the harbour-moles for the payment fixed in the tender to such an extent as may be required by the Board of Work before the Contractor removes his plant. He shall in good time inform the Board of Work when this removal of his plant will take place. The Contractor must arrange the work in such a way as not to impede the navigation in the harbour. The dredged up matter must be removed so far out to sea as to prevent its being brought back by the tide or by currents within the territory of the harbour. The Contractor shall, however, if so be required, be bound to unload as much of the dredged matter as the depth of the water permits to be discharged from a hopper (a self-unloading barge) or by shovelling out, in case ordinary barges are employed, behind a quay-wall that the Town Council may possibly cause to be built as an extension of the platform at the Hafnarstræti-pier in a westerly direction. Besides, he shall, if so be possibly required of him and on receiving separate payment, be bound to furthermore discharge dredged matter between the said quay-wall and Hafnarstræti to such an extent as to produce horizontal ground, the surface of which shall be 6 m. above low-water level.