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The last are used in concrete-steel composite structures as shear connectors. [6] Other uses include anchoring machines to poured concrete floors [7] and buildings to their concrete foundations. Various typically disposable aids, mainly of plastic, are produced to secure and align cast-in-place anchors prior to concrete placement.
In the case of hull breaches, these tools fastened steel plates over damaged areas. [3] These tools were developed by Mine Safety Appliances , for the United States Navy. [ 4 ] Powder-actuated tools were investigated and used prior to this development; they were used in anti-submarine warfare during the First World War and were the subject of a ...
Metal expansion joints have to be designed according to rules laid out by EJMA, for fabric expansion joints there are guidelines and a state-of-the-art description by the Quality Association for Fabric Expansion Joints. Pipe expansion joints are also known as "compensators", as they compensate for the thermal movement.
The global expansion continued throughout the 1960s and by 1971, Hilti's global turnover was 376 million Swiss francs across 45 countries, including new production facilities in Austria and in Germany. [11] In 1974 Hilti started to develop and market anchor bolts, and in 1977 Hilti introduced its first chemical anchor product line. Two more ...
Metal expansion joints (also called compensators) are compensating elements for thermal expansion and relative movement in pipelines, containers and machines. They consist of one or more metal bellows , connectors at both ends, and tie rods that depend on the application.
Figure 1 of the original patent for the molly bolt, U.S. Patent No. 2,018,251. The molly bolt was patented in 1934 by George Frederick Croessant. [3] Although his patent acknowledges that expandable fasteners of this general kind were already known, Croessant's patent is intended to provide "an improved and adequate anchoring grip that may be retightened if necessary and that will permit ...
The anchor selection, together with additional reinforcement, and rigging arrangements is influenced by: - The dead weight of the element - The number of anchors in the element and the configuration of the anchor - Capacity of the anchor at the specific concrete compressive strengths at time of lift - The dynamic loads applied during lifting ...
Such movement occurs as the strand load(s) is progressively transferred from the jack to the anchor, and results in a reduction in the prestressing force finally applied to the member. [2]: 25 [3]: 12 wire steel prestressing wire made from hot-rolled rods that is cold-drawn through dies to increase its strength. [1]: 15 wobble
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