Open bottom fiber reinforced precast concrete arch unit
Inactive Publication Date: 2007-11-15
CONTECH BRIDGE SOLUTIONS
View PDF39 Cites 23 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Benefits of technology
[0004] The present invention is directed to an improved one-piece open bottom precast concrete arch unit which is designed for underground use and to be buried in compacted soil. The arch unit of the invention provides all of the desirable features mentioned above and is effective to utilize the surrounding soil mass efficiently as a resistance support for the arch unit and thereby
Problems solved by technology
While an arch unit may be precasted in two or more sections to facilitate transportation, substantial additional
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016]FIG. 1 illustrates a plurality or series of longitudinally aligned one-piece open bottom fiber reinforced precast concrete arch units 10 constructed in accordance with the invention and supported by parallel spaced elongated concrete footers 12 which may be cast in place at the construction site or be part of a poured concrete floor. The arch units 10 are buried in compacted soil 15 (FIG. 2) and define a passage 16 through which pedestrians, vehicles or water may pass. The arch units may also be provided with end walls to define a chamber in which water may be temporarily stored, for example, run-off water received from a large parking lot.
[0017] Referring to FIGS. 1 & 3, each of the precast concrete arch units 10 has a length L, for example, eight feet, and includes a pair of curved or arcuate opposite legs or side wall portions 18 integrally connected by a curved or arcuate top wall portion 22, and the arcuate length of each portion 18 and 22 may be generally the same, as s...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
A one-piece open bottom fiber reinforced precast concrete arch unit is buried in compacted soil and has an arcuate top wall portion integrally connecting arcuate side wall portions. The fiber reinforced wall portions have a configuration which provides ductility and flexure strength for effectively utilizing the surrounding compacted soil to resist deflection of the unit in response to a load and to redistribute stresses in the unit. Each of the side wall portions of the unit has a reducing wall thickness towards its bottom and has a radius of curvature greater than the rise of the unit and at least twice the radius of curvature of the top wall portion. A fiber reinforced end arch unit includes an integrally precast and fiber reinforced vertical collar connected to fiber reinforced wing walls by bolts extending through the collar and into anchor nuts embedded in the wing walls.
Description
RELATED APPLICATION [0001] This application is a continuation-in-part of patent application Ser. No. 11 / 074,488, filed Mar. 8, 2005.BACKGROUND OF THE INVENTION [0002] This invention relates to open bottom precast concrete arch units of the type constructed to be buried in the ground or soil and as generally disclosed, for example, in U.S. Pat No. 3,482,406, U.S. Pat. No.4,558,969, U.S. Pat. No.5,281,053, U.S. Pat. No.6,161,342, U.S. Pat. No.6,205,717, U.S. Pat. No.6,406,220, U.S. Pat. No.6,408,581 and U.S. Pat. No.6,640,505. Such precast concrete arch units are produced in various sizes and spans, for example, by Bebotech Corporation in Middletown, Ohio who offers part elliptical and part circular shapes and as a single or one-piece casting or as a twin or two-piece casting with spans from 12 feet to 84 feet. In such precast concrete arch units, it is common to have a wall thickness of 8 to 14 inches and to have embedded in the concrete walls steel reinforcing bars or rods which may...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more