Static molds – Uniting preform with molding material – Rail or railway type preform
Patent
1988-04-27
1990-08-14
Housel, James C.
Static molds
Uniting preform with molding material
Rail or railway type preform
52701, 249 39, 249 91, 249177, 2492191, B28B 2300
Patent
active
049480898
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCT/EP 87/00487 filed 27 August 1987 and based upon German application P36 29 030.0 filed 27 August 1986 under the International Convention.
FIELD OF THE INVENTION
The invention relates to the emplacement of tubular components in finished concrete parts, particularly for the attachment of fastening screws for rails in switch cross ties of prestressed concrete. More particularly the invention relates to devices consisting of a pin, upon which a tubular component can be plugged, and a nipple provided in its bottom, with which the fixture can be inserted into a corresponding recess in a concrete form.
BACKGROUND OF THE INVENTION
In the case of railroad ties it is necessary that rail fastening screws, which determine positioning of the track lie exactly at prescribed positions. This applies particularly to ties for switches is which this position varies from tie to tie.
The position of the rail fastening screws in the cross tie is fixed by means of screw anchors into which the screws are turned, or by means of tubes through which the screws are turned, or by means of tubes through which the screws are passed. The positionally correct assembly of these components for the fastening screws for the rails which continually change position in the cross tie represent a considerable cost factor in the manufacture of cross ties, which one endeavors to keep as small as possible through simplification of the design of these components and their fastening and by shortening of the assembly time. In addition, in cross ties produced in prestressing fixtures, the fastening of the components on the concrete form must not impede the movement of the tie resulting from setting up and prestressing in the form during the manufacturing process.
From FR PS 15 65 510, FIG. 2, a holding fixture is known for a component displaceable from the inner side of the concrete form with a nipple reduced in cross section opposite the retaining pin. This holding fixture has the disadvantage that it is not anchored in the concrete form. In rough handling at assembly it can drop out. During forming it could remain attached to the part being produced, and would have to be removed by a time-consuming post-forming operation from the anchor hole after concreting. Furthermore, it may be subjected to large shear forces between the concrete form and the part being produced when that part changes length during the production process.
Furthermore, an assembly anchor for ties is known from DE 30 39 931 which is connected in one piece to a fastening means of about equal cross section, which can be inserted into a bore of corresponding size in the concrete form. In this fastening means connected to the anchor it is considered a disadvantage that it cannot be recovered. Due to its relatively large cross section the fastening means has such strength that, even when there is a desired breaking point, the intended break does not occur with assurance. At removal of the tie from the form, the anchor thus can remain attached to the bottom of the form, and is pulled out of the concrete.
OBJECT OF THE INVENTION
It is the object of the invention to provide a recoverable fastening means for inserts in such a way that the nipple fixing the fastening means on the concrete form is solidly anchorable in the corresponding recess of the concrete form, and shears off easily when shear forces arise during the hardening and prestressing of the finished part without transferring stresses to the finished part, and can be replaced after shearing off by a new nipple with little effort.
SUMMARY OF THE INVENTION
This object is achieved in that the pin and nipple are independent parts, separate from one another, detachably connected to one another by suitable connecting means, the nipple has an upper and a lower stop such that with the upper stop the nipple can be anchored in the pin and with the lower stop can be anchored in the base plate of the concrete form, and mean
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No. 1,926,398 Arthur Fischer Tumlingen, Kunststroffdubel, Dec. 19, 1964.
Bergenthal Wolfgang
Knodel Rolf
Schimpff Frithjof
Zander Thomas
Dubno Herbert
Housel James C.
Wayss & Freytag Aktiengesellschaft
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