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Three-joist trussed steel beam linear control method

A technology of linear control and steel truss girders, which is applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., and can solve problems that cannot well meet the construction requirements of three-truss steel truss girders

Active Publication Date: 2009-08-19
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the existing technology cannot well meet the construction requirements of the three-truss steel truss girder

Method used

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  • Three-joist trussed steel beam linear control method

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] The invention provides a method for controlling the alignment of a three-truss steel truss girder, including elevation control and plane alignment control, such as figure 1 As shown, the elevation control includes the following steps:

[0020] A1: When assembling the main truss members between two adjacent steel truss girders, punch nails and high-strength bolts with 35% of the total number of holes in the upper foot evenly distributed according to 50% of the total number of holes, and loosen the hook after general tightening; Punching nails with 30% of the total number of holes and high-strength bolts with 30% of the total number of holes are punched into other rods, and the hooks are loosened. The diameter of the punching nails is 0.3-0.5mm smaller than the theoretical hole diameter;

[0021] A2: During the erection process, the height difference caused by ...

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Abstract

The invention relates to a steel truss girder linear control method of the bridge upper structure construction field and provides a three-truss steel truss girder linear control method. The control method comprises vertical control and plane linear control. The vertical control comprises A1. a main truss rod component between two adjacent steel truss girders and other rod components are assembled, the diameter of a punching nail is 0.3-0.5mm less than theoretical aperture; A2. the altitude difference caused by the uneven settlement of a temporary bearing is adjusted in advance by adjusting a pivot of next segment; the altitude difference caused by uneven load is adjusted by applying external force by the punching nail through the clearance of the aperture; the plane linear control adjusts and positions the midline of a middle truss according to the design line shape by a chain fall; and the midline of two lateral trusses is adjusted within the range of standard requirement with the midline of the middle truss as a reference line by adjustable profile steel. During the spanning process, the invention can control and adjust the altitude, the altitude difference and the plane line shape of three trusses effectively in time and ensures that the integral line shape and truss width of three trusses meet the requirement, thereby ensuring that three trusses are jointed successfully.

Description

technical field [0001] The invention relates to a steel truss girder alignment control method in the field of bridge superstructure construction, in particular to a three-truss steel truss girder alignment control method. Background technique [0002] At present, the erection process of steel truss girders is aimed at two main truss steel girders, but with the development of society, railway bridges across large rivers and rivers generally use four-line railways. Therefore, more and more three-truss steel truss bridges Has been put into construction. The overall rigidity of the three-truss steel truss is high. Deviations during assembly will affect the force of the structure. At the same time, the closing will be difficult to proceed smoothly. This requires us to strengthen the control of installation accuracy during the construction process, which cannot be well satisfied by the existing technology. Construction requirements. Contents of the invention [0003] The techn...

Claims

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Application Information

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IPC IPC(8): E01D21/00
Inventor 秦顺全宋伟俊潘军董广文牟翔尚庆果崔巍查道宏邓树强戴贤荣
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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