SU1477809A2 - Girder bridge - Google Patents

Abstract

The invention relates to bridge construction and can be used in girder concrete bridges. The purpose of the invention is to reduce the consumption of concrete and reinforcement, improve the torsional spans and prevent the formation of longitudinal cracks when using a continuous roadway coating. The beam bridge includes supports, a reinforced concrete span structure longitudinally divided into blocks 1, consisting of a plate 2 of the carriageway and a lower longitudinal edge 3, supporting parts 4 arranged in pairs under each section, transverse prestressed reinforcement elements 5 placed in the gaps between the blocks 1, sealing elastic gaskets 6, in the upper part of the ribs 3, rows of transverse holes 7 are formed, and each reinforcing element 5 is located under the slab 2 of the carriageway and passed without adhesion through a series of coaxial transverse holes 7 in the ribs 3. Channels can be formed in the slabs of the extreme blocks, in which the ends of the prestressed reinforcing elements are anchored. f-ly, 4 ill.

Description

/ Fig. 1

h

N:

The invention relates to bridge construction, can be used in girder concrete bridges and is an improvement of the invention according to the author. St. No. 1073362.

The purpose of the invention is to reduce the consumption of concrete and reinforcement, improve the torsional spans and prevent the formation of longitudinal cracks when using a continuous roadway coating.

FIG. 1 shows a span structure combined by transverse prestressed reinforcing elements, a cross section; in fig. 2 — node I in FIG. 1 (arrangement of the tension elements in the plates of the carriageway of the extreme sections along the entire length of the console); in fig. 3 - node II in FIG. one; in fig. 4 - Tavrov section of the superstructure, cross section.

The beam bridge includes supports (not shown), a reinforced concrete superstructure, longitudinally divided into blocks 1, consisting of a plate 2 of the carriageway and a lower longitudinal bearing rib 3, support parts 4 arranged in pairs under each section, transverse prestressed reinforcing elements 5 placed in the gaps between the blocks 1 sealing elastic gaskets 6, and in the upper part of the ribs 3 are formed a series of transverse holes 7, and each reinforcing element 5 is located under the plate 2 of the roadway and passed without adhesion through a plurality of coaxial transverse holes 7 in the ribs 3,

Channels 8 can be formed in the plates of the two extreme blocks, in which the ends of the prestressed reinforcing elements 5 are anchored.

Each block 1 of the superstructure is made with a layer of waterproofing 9, wound up on the ends of the slab of the carriageway, and covering 10, laid in factory conditions.

It is possible to calculate the transverse prestressing mainly on the transverse force, which allows a significant reduction in the number of tensioned elements. At the same time, there is a need to perceive a bending moment in the slab of the carriageway, since otherwise openly available tensioned reinforcement will work for endurance,

, -,

e

m

ten

15

20

25

thirty

35

40

45

50

55

that at the existing levels of prestressing, anchors used and methods of protection against corrosion, it is impractical. In connection with this, the blocks are mounted on paired bearings, allowing their torsional rigidity to be ensured. Due to it, as well as due to the spatial rigidity of the entire span (which is absent when the section is located with a gap), the bending moment from the bridge load can be perceived without significant force changes in the prestressed reinforcing element.

The invention can be used for girder concrete bridges with spans up to 33 m. At the same time, in spans up to 12 m, the proposed structure can compete, for example, with a known one, reducing the consumption of materials and improving the performance characteristics of the superstructure; At the same time, the technological indicators of the design are somewhat reduced due to the need for transverse prestressing.

Claims (2)

1. Beam bridge on the bus. St. No. 1073362, characterized in that, in order to reduce the consumption of concrete and reinforcement, improve torsional spans and prevent the formation of longitudinal cracks when using a continuous roadway cover, the bridge is provided with transverse prestressed reinforcement elements and sealing resilient gaskets, the upper part of the block edges along the axis of the bridge are formed by rows of transverse holes, with each prestressed reinforcing element located under the slab of the carriageway and skipped without clinging through a series of coaxial transverse holes in the ribs, and elastic gaskets placed in the gaps between the blocks. 2. The bridge according to claim 1, about tl and h and y - y and with the fact that channels are formed in the slabs of the extreme blocks ankles horses of prestressed reinforcing elements. Ri, gg Fi, b. $ and, GL