RAILROAD TIE |
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申请号 | US13078989 | 申请日 | 2011-04-03 | 公开(公告)号 | US20120248215A1 | 公开(公告)日 | 2012-10-04 |
申请人 | Javad Mirmohamad Sadeghi; Mohammad Worya Khordebinan; | 发明人 | Javad Mirmohamad Sadeghi; Mohammad Worya Khordebinan; | ||||
摘要 | An improved railroad tie comprises a monolithic elongate tie body divided into a pair of end sections and a narrow mid section interconnecting the pair of end sections. Further, the top surface of each end section divided into a proximal and distal surface sections interconnected by a rail seat section whereon a rail is fixedly mounted. The proximal and distal surface sections slope downwards, in opposing directions, as they extend longitudinally from the rail seat section and connect the top surface of the mid section and the extreme lateral edge of the top surface of the end section respectively. The mid section is of uniform trapezoidal cross-section. The railroad tie further comprises a plurality of steel rebars cast within the tie body. | ||||||
权利要求 | What is claimed is: |
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说明书全文 | This invention relates to railway engineering and more particularly to railroad ties. Concrete railroad ties are reinforced or pre-stressed concrete beams generally configured to have a uniform and trapezoidal cross-section. Steel bars are typically embedded into a railroad tie for reinforcement purposes. The top surface at each end of the railroad tie is fitted with a rail attachment means (called fastening system). The base of the railroad tie is wider than its top surface so as to have the ties-ballast contact pressure less than the allowable amounts. Although these typical railroad ties are effective in carrying out their purpose, they are not optimally designed and hence not cost-effective. More particularly, although, the central section of the railroad tie is not subjected to the same amount of load as the end sections of the railroad tie, nonetheless, the former is “invested” with the same amount of raw material (concrete). This superfluous material on the central section not only makes the railroad tie expensive but also bulky and heavy. Furthermore, the amount of steel bars used in the conventional ties is not optimum. Therefore, in the light of the above discussion, there is a need in the art for an improved railroad tie that has an optimal design, and is thereby cost-effective. Such a railroad tie should also possess all mechanical and structural characteristics required by the international standards. The present invention is an improved railroad tie which aims to address the above mentioned need: to have an optimal structural configuration and thereby, being cost-effective. The railroad tie is a longitudinal beam which comprises a monolithic elongate tie body divided a pair of end sections interconnected by a mid section. The top surface of each end section includes a rail seat section whereon a rail sits. The mid section is narrower and is of uniform trapezoidal cross-section. Compared to the typical concrete railroad ties discussed above, the railroad tie of the present invention consumes lesser amount of raw material, i.e., concrete and steel, owing to the narrow structural configuration of the mid section. Steel bars are cast within the railroad tie for pre-stressing. The improved railroad tie, while possessing all the mechanical and structural characteristics required by international standards, is lighter, less bulky, and essentially cost-effective compared to traditional concrete railroad ties. Also, less ballast is needed for the railroad tie since its structural configuration causes a more uniform stress distribution of the pressure on the ballast and thereby less stress concentration on and within the ballast layer. The other objects and advantages of the embodiments herein will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
In the following detailed description, a reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense. Referring to Still referring to The length of the tie body is divided into three sections, viz., a pair of end sections 14, and a mid section 16 interconnecting the pair of end sections. Referring to Still referring to Referring to Referring to While there is a myriad of possibilities as to, to what dimensions the railroad tie 10 is to be made, The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the appended claims. Although the embodiment herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the invention with modifications. However, all such modifications are deemed to be within the scope of the claims. It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between. |