Closure method for height variable continuous steel truss girder

Abstract

The invention discloses a closure method for a height variable continuous steel truss girder. A left side girder section and a right side girder section are in splice connecting to form into the constructed height variable continuous steel truss girder and girder section temporary supporting seats are arranged on pier tops of bridge piers which support the height variable continuous steel truss girder. The closure method for the height variable continuous steel truss girder comprises constructing the left side girder section and the right side girder section and closing. The closing process comprises installing a bottom chord connecting rod, installing a first connecting rod, installing an upper chord connecting rod and connecting every rod member; connecting the bottom chord connecting rod and the left side girder section through a first closure hinge which comprises a first connecting plate and two hinged shafts and enabling a first long round hole and a first round hole to be formed in the first connecting plate and the bottom chord connecting rod; and connecting the upper chord connecting rod and the left side girder section through a second closure hinge. The closure method for the height variable continuous steel truss girder has the advantages of being simple in step, reasonable in design, simple to use and operate, convenient to achieve and good in utilization effect and being capable of solving the problems that the existing height-variable continuous steel truss girder cannot achieve high accuracy, low risk and high efficiency closing in construction.

Description

technical field [0001] The invention relates to a closing method of bridges, in particular to a closing method of variable-height continuous steel truss girders. Background technique [0002] The variable height continuous steel truss girder refers to the continuous steel truss girder whose top chord is variable height. Nowadays, when constructing steel truss girders with large spans and variable heights on the upper chord, gantry cranes, floating cranes or a combination of the two are generally used to erect them, and the specific construction methods are as follows: side spans are erected using lifting stations at each Assembled on the temporary buttress under the first node, the mid-span erection uses the cross-line gantry or floating crane with the construction channel as the track to carry out the cantilever assembly of the steel beams and rods, and close them at the mid-span. [0003] At present, when closing the mid-span of continuous steel truss girders, the main co...

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Problems solved by technology

[0003] At present, when closing the mid-span of continuous steel truss girders, the main construction method is "long round hole + round hole closing hinge". The estuary is located in the center of the Yellow River channel and the closing time is in December when the weather is cold, coupled with factors such as strong wind restrictions on the construction site, it is difficult and risky to set up the construction platform at the closing position, and auxiliary pushing and stretching devices are required. Weather factors need to be considered, and construction can only be carried out when the temperature and sunshine are suitable

To sum up, in actual construction, the above-mentioned existing closing methods have practical problems such as large material consumption, long closing time, and difficulty in achieving high-precision, low-risk, and high-efficiency closing for large-span upper chord variable-height continuous steel truss girders.

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