Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1989-10-05
1992-06-23
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
249 86, 264154, 264156, 264219, 264228, 264229, 264277, 264278, 264279, 2642791, 2642979, 264333, 264334, 264337, 425111, 425121, 425123, B28B 114, B28B 1306
Patent
active
051240939
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/EP89/00644 filed Jun. 8, 1989 and based upon German national application P38 23 860.8 filed Jul. 14, 1988 under the International Convention.
1. Field of the Invention
My present invention relates to a process for the production of concrete switching cross ties in a prestressing-bed casing whose bottom plate has holes through which means can be asserted for fixing fastening devices for construction elements of the cross ties during the pouring of the concrete and which are repeatedly insertable for cross ties of different lengths and different arrangements of the construction components.
2. Background of the Invention
As a rule, because of the large-series production, casings for concrete series-produced finished parts are manufactured very rigidly and expensively. This applies particularly to cross ties produced in succession in a prestressing bed. In these cases, there are very high demands for a particularly accurate measurement of the position of the construction components. Therefore, the construction elements are fastened in bores of the casing, which have to be measured extremely accurately.
In the case of cross ties, the construction components, e.g.; anchor screws or tube sockets for the fastening screws of the track cross ties, are located on the upper side of the cross tie. The upper side of the cross tie lies in the casing, on the casing bottom. Thus, the bottom plate serves as a pattern for the insertion of the construction components.
In large series, a hole template is often used. The pattern which has to be produced for each type of cross ties influences the cost of the individual cross tie only slightly. But in the case of smaller production series of a certain cross-tie type, the costs related to the bottom plate serving as a pattern for the construction components can make the process uneconomical.
Particularly complicated is the making of the holes in the patterns for the switch cross ties. In normal track ties, the rail axes cross the cross ties perpendicularly. The construction components for the fastening of the rail to the cross tie and correspondingly the bores fixing them to the bottom plate of the casing are located on the median axis, in the case of normal track ties. Things are different in the case of switch cross ties: Here as a rule, the rail axes cross the cross tie axes at various angles, usually not right angles. Up to now, for the fastening of rail tracks which were not crossing at right angles also axially bored slabs were also used and required construction components arranged in numerous axes scattered over the surface of the cross ties for the fastening screws of the slabs and corresponding boreholes for the fastening of the construction components in the bottom plate of the casing. A casing for switch cross ties made of concrete is known from the German patent 3440247. This casing has a bottom plate made of steel which is embedded with accuracy of fit between lateral parts. The production of new bottom plates with holes on different spots and their insertion is expensive.
Objects of the Invention
It is the object of the invention to provide a process according to which a bottom plate of a prestressing-bed casing for the production of smaller series of concrete switch cross ties with various arrangements of the construction components can be repeatedly used.
SUMMARY OF THE INVENTION
These objects and others which will become apparent hereinafter in a process wherein, according to a first aspect, after the first use of the bottom plate, a thin, nonslidable covering is applied to the bottom plate which covers the holes of the previous use, and, depending on the respective selected material, is thick enough to extend over the covered holes even under the load created by the pressure of fresh concrete during the finishing operation and to remain undamaged, and whereupon the position of the fastening devices corresponding to the new use are marked.
In a second aspect of
REFERENCES:
patent: 3685783 (1972-08-01), Hilson
patent: 4102957 (1978-07-01), Da Re
patent: 4242071 (1980-12-01), Stinton
patent: 4290991 (1981-09-01), Thim
patent: 4495127 (1985-01-01), Thim
patent: 4738605 (1988-04-01), Aerts et al.
Die Bundesbahn Band 9 Sep. 1982 (De) H. Schultheiss: "Erstmals Bei Der DB: Weiche Auf Spannbetonschwellen".
Revue Generale Des Chemins De Fer, Band 221, Feb. 1986, Gaughier-Villars, (Paris, FR) J. Oeconomos et al.: "Branchement Deux Voies Sur Plancher En Beton Precontraint".
Aftergut Karen
Dubno Herbert
Wayss & Freytag Aktiengesellschaft
Wilford Andrew
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