Internal and external supporting rod type cable-arch structure

Abstract

The invention discloses an internal and external supporting rod type cable-arch structure. The internal and external supporting rod type cable-arch structure comprises an upper chord beam. The upper chord beam is provided with a plurality of sets of chord inhaul cables. Each set of inhaul cables include an upper inhaul cable and a lower inhaul cable, wherein the upper inhaul cable and the lower inhaul cable are arranged on the upper side and the lower side of the upper chord beam and are respectively in a V type, an opening of the upper inhaul cable is downward, an opening of the lower inhaul cable is upward, the front free ends and the rear free ends of the upper inhaul cable and the lower inhaul cable are hinged to the upper chord beam, the hinge points on the same side coincide, an upper supporting rod is downwards arranged from the folding point of the upper inhaul cable and located between the folding point and the upper chord beam, a lower supporting rod is upwards arranged from the folding point of the lower inhaul cable and located between the folding point and the upper chord beam, and the upper supporting rod and the lower supporting are hinged to the same point on the upper chord beam. A front hinge point of a rear set of chord inhaul cables coincides with the hinge point of a front set of supporting rods. A rear hinge point of a front set of chord inhaul cables coincides with the hinge point of a rear set of supporting rods. After a certain upper inhaul cable or lower inhaul cable loses efficacy, the whole structure will not immediately lose efficacy, collapse resistance is improved, the height of the whole section increases, and the bearing capacity is largely improved.

Description

technical field [0001] The invention relates to a cable arch structure, in particular to an inner and outer brace type cable arch structure. Background technique [0002] At present, there are more and more applications of long-span steel structures in the field of civil engineering. However, with the increase of the span, the self-weight increases sharply, and the structure faces the contradiction of the mutual restriction of the use function, design rationality and economic indicators. In order to meet the function of the structure and reduce the structure's own weight to improve the rigidity of the structure, prestressed string beams equipped with cables are more and more used in long-span steel structures. Through the arrangement of prestressed cables and struts, the bearing capacity and stiffness of the long-span steel structure have been greatly improved. [0003] Existing cable-arch structures such as figure 1 As shown, the existing string girder includes the uppe...

AI Technical Summary

Problems solved by technology

[0006] In general, there is one or more layers of PE protective layer on the surface of the cable 2, which is chemically unstable relative to the steel, so even if the friction force between the cable clamp 4 and the cable 2 is large enough during construction, it will not It can only keep the strut 3 vertical for a certain period of time, even if the friction test is done at that time, and the requirements are met, due to the chemical instability of PE, chemical changes (such as chemical decomposition, aging) will occur quickly, resulting in The cable slips at the connection point between the strut 3 and the cable 2, causing the cable 2 to become loose, thereby causing structural safety hazards

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