SU1231098A1 - Box-shaped metal span structure of bridge - Google Patents

Description

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The invention relates to construction and can be used in the construction of railway bridges with metal spans with a ride on top.

The purpose of the invention is to provide the possibility of increasing the length of the span to be covered with maximum utilization of the loading gauge.

FIG. 1 shows the main beam of the superstructure; in fig. 2 - the same example; in fig. 3 - placement of the L-shaped block in the envelope; in fig. 4 is the same, an example of the arrangement in FIG. 5 - enlarged mounting blocks before installation in the span; in fig. 6 - the same, an example.

The main beam of the span structure is longitudinally connected to the river-shaped blocks 1. Each block, comprising half of the top 2 or bottom 3 of the horizontal plate and part of the wall 4, which can be vertical or inclined, is manufactured at the factory. The main joint 5, which includes the slab in cooperation with the wall, is welded. The elements of cross-links 6 give the block the necessary rigidity during transportation to the place of assembly.

The connection between the blocks along the walls 7 can be flanged, overlapped, butt-joint and made either on high-strength bolts or on welding. The configuration of the unit (vertical or inclined wall) and the cross-sectional dimensions are determined on one side by loading dimensions 8 with the respective vehicles 95 as the other — by general dimensions and designation. In particular, for railway

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The width of the flight structures of bridges depends on the number of tracks. In one design, it is possible to combine blocks with vertical and inclined

5 walls.

The union along the walls of the two L-shaped blocks, reinforced, if necessary, by an additional element of the cross-linking 10, form a branch that can be completely installed in the span. Since the weight of each branch is two times less than the weight of a structure with a full cross section, you can use either less powerful cranes,

tS or the same cranes with which the structure with full section is mounted overlap large spans. In the latter case, it is possible to exclude the construction of temporary intermediate supports.

The two branches installed in span and the joining beam joints at joints 11 in plates 2 and 3. Joints can be flanged on bolts, with a fairly reliable connection of cross-links adjacent to these joints, the function of the longitudinal joint in plates can be sealing the internal cavity of the beam. In structures that are intensively working in torsion (for example, double-track span structures with a small cross-section of the closed part of the beam), it may be advantageous to set the estimated number of high-strength bolts in these joints.

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The invention makes it possible to use the advantages of closed cross section beams for spans of greater magnitude.

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Compiled by V. Dankov Editor E. Kopcha Techred N. Bonkalo Proofreader A.T.

Order 25A2 / 32 Circulation 514 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

fae. 6

Claims (1)

Metal casket BRIDGE BRIDGE comprising box-bikes with L -shaped blocks and butt joints, characterized in that ,, in order to provide the possibility of increasing the span length overlapped with the maximum use of loading gauge, L-shaped blocks raspolo- ¹ wife in each box girder symmetrically with respect to its main axes of _t symmetry, and the butt joints of box-shaped beams are located in the planes of their symmetry. 123