Bridges – Bridge construction method
Reexamination Certificate
1995-05-08
2002-02-12
Hartmann, Gary S. (Department: 3673)
Bridges
Bridge construction method
Reexamination Certificate
active
06345403
ABSTRACT:
TECHNICAL FIELD
The present invention relates to concrete diaphragms for bridges.
BACKGROUND OF INVENTION
U.S. Pat. Nos. 3,794,433 and 3,906,687 of Morris Schupack show concrete diaphragms which are cast-in-place.
DISCLOSURE OF INVENTION
A disadvantage of cast-in-place diaphragms is that they require considerable field time to prepare, thus slowing bridge construction.
It is an object of the invention to accelerate the provision of diaphragms in bridge construction.
Other objects of the invention will become apparent from the remainder of this specification as set forth below.
The invention provides precast concrete diaphragms to accomplish the objects of the invention.
A number of developments of the invention improve on this basic concept. For instance, in preferred modes of the invention, the ends of precast diaphragms are provided with pockets which receive concrete or group to accommodate variations in the relative positions of the longitudinal bridge beams and make a tight fit between them and the diaphragms. And, the longitudinal bridge beams may be prestressed against the diaphragms, this development of the invention being useful in the case of cast-in-place diaphragms as well. Other important characteristics of the invention will become apparent in the remaining explanations below.
REFERENCES:
patent: 4042991 (1977-08-01), Macy et al.
patent: 4710994 (1987-12-01), Kishida et al.
patent: 5634308 (1997-06-01), Doolan
patent: WO 94/10389 (1994-05-01), None
Hartmann Gary S.
Jones Tullar & Cooper P.C.
Schuylkill Products, Inc.
Sullivan Jr. Daniel A.
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