Disaster damage reducing and longitudinal beam falling preventing device for beam type bridge

Abstract

The device is specially used in the field of traffic engineering and can prevent longitudinal falling of a beam body when bridge pier column supporting of a beam type bridge fails due to various major disasters, and therefore disaster losses are reduced. The safety protection device is characterized in that at least two high-strength ropes are embedded in advance in the bridge span direction at the top of a bridge abutment or a single-thrust pier during bridge construction, and the ropes are transversely locked and connected at intervals to form the safety protection device of the upper structure of a bridge body; the section size and the number of the longitudinal main bearing ropes are determined according to the strength of the used rope material and the weight of the upper structure of two adjacent spans of the bridge (the number of the longitudinal main bearing ropes below each beam is not less than two). The attached figure is a beam bridge structure under a general condition, a gravity bridge abutment, a pile column type pier and an upper prefabricated beam simply-supported continuous bridge deck structure are adopted, when the bridge deck structure is used for a beam bridge structure with more spans, all that is needed is to longitudinally penetrate through a whole set of ropes or a whole bridge, and the situation that only one pier column is lost for supporting is considered by the inventor, which is the applicable limitation of the invention.

Description

Technical Field

[0001] This device is a kind of device specially designed for beam bridges in the field of civil engineering of highway, railway and municipal road traffic. It can prevent the beam from falling immediately in the longitudinal direction when the bridge piers are seriously displaced or damaged due to major disasters such as earthquakes, floods, mudslides, impacts and squeezing, thereby reducing the expansion of losses caused by the disaster and avoiding more serious disaster losses in a short period of time. Background Art

[0002] A common feature of bridge accidents is that when a disaster occurs, the beam bridge loses support and the beam falls longitudinally.

[0003] The emergence and development of bridge technology also has a characteristic: simultaneity and antiquity. Rope bridges (suspension bridges) were created at the same time as single-log bridges (beam bridges). Both types of bridges are very old. With the development of modern science and technology and the advancement of material technology, various high-strength materials have emerged, such as high-strength steel, carbon fiber, composite materials, etc., which has provided the possibility for the mutual support and common development of these two types of bridges. Summary of the invention

[0004] The device for reducing disaster damage and preventing longitudinal beam drop of beam bridges is to bury at least two high-strength ropes in the abutment or single thrust pier in the direction of the bridge span when the bridge is built, and to lock and connect these ropes horizontally at intervals to form a safety rope protection device for the upper structure of the beam body. The cross-sectional size and number of the longitudinal main load-bearing ropes shall be determined according to the strength of the rope material used and the weight of the upper structure of the two adjacent spans of the bridge (no less than two ropes under each beam). With such a rope protection device, the longitudinal drop of the beam body can be prevented when the bridge loses support locally, thereby achieving the purpose of reducing disaster losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Application for the device for reducing damage and preventing longitudinal beam fall of beam bridge Figure 1 Figure 2 It is a schematic diagram of a three-span beam bridge structure under general circumstances, which also adopts gravity abutments, pile-column piers, upper simply supported prefabricated beams, and simply supported continuous bridge deck structures; the present invention is also applicable to beam bridge structures with more spans, such as a group of four-span continuous bridge decks or a group of five-span continuous bridge decks. In actual use, it is only necessary to longitudinally penetrate the entire group of ropes. However, the inventor and the designers during implementation can only consider the situation where the support of one pier is lost, and do not consider the situation where multiple adjacent piers are lost at the same time. This is the applicability limitation of the present invention. DETAILED DESCRIPTION

[0006] The diagram of the device for reducing disaster damage and preventing longitudinal beam falls of a beam bridge also adopts gravity abutments, pile-column piers, upper simply supported prefabricated beams, and simply supported continuous bridge deck structures. The present invention is also applicable to beam bridge structures with more spans, such as a group of four spans with continuous bridge decks or a group of five spans. When designing the bridge, the weight of the two longitudinal beams of the two adjacent spans plus the weight of the bridge deck pavement above the beams is selected in combination with the strength, cross-sectional size, and number of longitudinal main ropes. There are no less than two main ropes under each beam, and three or more main ropes can also be provided. The transversely connected cable rope only serves to stabilize the main rope. The two ends of the main rope are respectively anchored in the abutments or single thrust piers. In order to increase the anchoring force, in addition to sufficient anchoring length, anchor rods or force-sharing anchor cables must be transversely consolidated on the main rope. The device is pre-buried during the construction of the bridge piers and the installation of the device is completed before the installation of the beams, and the bridge construction is not affected afterwards.

Claims

1. This technology of longitudinally arranging ropes to protect beams from falling onto the span is used in the construction and operation of beam bridges.

2. The creativity of using this device in new and renovated beam bridges.

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