Cable-stayed bridge concrete beam combined hanging basket construction method

Abstract

The invention discloses a cable-stayed bridge concrete beam combined hanging basket construction method. Stay cable construction is divided into two times of tensioning, the two times of tensioning are conducted after segment pouring and hanging basket walking respectively, the internal force influence on new concrete and old concrete due to different working conditions is reduced, cross operationis reduced, and effective control over the line shape of a finished bridge is enhanced; due to the fact that a small cross beam is arranged between two box chambers of a main beam, when a hanging basket moves forwards after concrete pouring is completed, due to blocking of the cross beam, a hanging basket bottom die system needs to be lowered firstly. Therefore, small wood molds convenient to mount and demount should be adopted for the cross beam portion plate, the demounted formwork and the demounted support are flatly laid on the hanging basket bottom mold, the lowering height of the hanging basket hanging system is reduced, lowering time is saved, and the underbridge navigation clearance requirement can be met. The method is applied to the field of bridge hanging basket construction.

Description

technical field [0001] The invention relates to the field of bridge hanging basket construction, in particular to a construction method for a cable-stayed bridge concrete beam combined hanging basket. Background technique [0002] As a long-span bridge form, cable-stayed bridges are often used to span large rivers or existing lines. Cable-stayed bridges with larger spans usually adopt steel girder structures in consideration of operating loads and construction progress, while cable-stayed bridges with smaller spans, From the point of view of overall construction cost and later maintenance cost, concrete cast-in-place beam structure can be adopted. Due to the large span of the cable-stayed bridge, the cantilever pouring method is commonly used in the construction of the main concrete girder. Generally, the cables of the inclined bridge are used as the traction system of the hanging basket equipment, which is called the pulling cable hanging basket. The cable hanging basket c...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of the existing cable hanging baskets are: the structure of the first cable hanging basket is complex, the front fulcrum of the traditional cable hanging basket is only pulled by the cable stays at both ends, and the larger the width of the bridge deck, the greater the span between the two cables , the greater the rigidity requirement for the lower platform of the hanging basket; for the wide-flange cable-stayed bridge, the C-shaped hook at the middle fulcrum for the forward movement of the hanging basket also needs to be strengthened accordingly

The construction process of the two-stay cable hanging basket is complicated, and a large load change will inevitably occur during the concrete pouring process of the beam section. The cable-stayed cable is used as the front fulcrum traction system of the hanging basket, and the change of the force on the cable will inevitably lead to an increase in elongation. As a result, the bridge alignment of the beam section is affected, so the cable force should be adjusted accordingly according to the change of the load to eliminate the above-mentioned influence

Therefore, the construction of the dragline hanging basket has high requirements on concrete performance, supply and pouring methods, the process of cable force adjustment process and force system conversion is more complicated, there are many cross operations, and the construction period is long