An ultra-wide front fulcrum hanging basket

Abstract

An ultra-wide fore-fulcrum hanging basket comprises a front transverse beam (1), a middle transverse beam (2), a rear transverse beam (3), two sets of main longitudinal beams (4), two sets of edge auxiliary longitudinal beams (5) and two sets of middle auxiliary longitudinal beams (6). Web members (7) are connected between every two main longitudinal beams (4), every two edge auxiliary longitudinal beams (5) and every two middle auxiliary longitudinal beams (6), small longitudinal beams (8) are connected between the front transverse beam (1) and the middle transverse beam (2), and C-shaped walking hanging hooks (10) are fixedly connected to the two ends of the middle transverse beam (2) respectively. Arc heads (9) are fixedly connected to the front ends of the main longitudinal beams (4), and walking reverse rolling wheels (12) are arranged at the rear ends of the edge auxiliary longitudinal beams (5). The wedge-shaped thrust keys (11) are fixedly connected to the parts, between the middle transverse beam (2) and the rear transverse beam (3), of the edge auxiliary longitudinal beams (5), and wedge-shaped grooves (16) matched with the spherical surfaces of contact surfaces of the wedge-shaped thrust keys (11) are formed in the joint parts of main beam inclined web members and a bottom plate. The ultra-wide fore-fulcrum hanging basket has the advantages that the height of the hanging basket can be reduced, local stress concentration can be prevented, and the requirements for large horizontal component thrust, effective force transmission and no-load walking can be met.

Description

technical field [0001] The invention relates to the technical field of a front fulcrum hanging basket, in particular to an ultra-wide front fulcrum hanging basket. Background technique [0002] Long-span concrete cable-stayed bridges are especially suitable for construction by the cantilever cast-in-place method. In the 1970s and 1980s in my country, most of the cantilever pouring construction of cable-stayed bridges continued to use the rear anchor point hanging basket commonly used by continuous beams. This form of hanging basket is single cantilever bearing force, which bears a large negative bending moment, and the length of the pouring section is greatly limited. The ratio of the hanging basket's self-weight to the gravity of the poured beam section is generally above 0.7, and may even reach 1.0-2.0 , these characteristics limit the wide application of the rear anchor hanging basket in the construction of cable-stayed bridges. In 1988, the Dames Corner Bridge (referre...

AI Technical Summary

Problems solved by technology

The structure of the front fulcrum hanging basket must not only meet the requirements of strength, but also meet the requirements of stiffness. However, when the main beam spans large, the weight is heavy, and the height of the hanging basket is limited, it must meet the requirements of small deformation (deflection) of the hanging basket. quite difficult

In addition, due to the large horizontal component force of the cable stay, the thrust device is required to transmit force clearly and effectively, not only to meet the strength requirements, but also to have the requirement of active compression. It is difficult for ordinary thrust devices to meet the requirements of large thrust transmission functions.

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