SU1717693A1 - Reinforced beam bridge - Google Patents

Abstract

The invention relates to bridge construction and can be used to enhance slab-beam bridges with non-sprinkling foundations. The purpose of the invention is the reduction of the material and labor intensity of construction. The reinforced girder bridge includes a slab-beam span structure, supports and reinforcement structure, made in the form of a pair of frames, each of which is adjacent to the corresponding support and made with an upper bolt and a lower girder mono-molded with it, combined with upper racks and buried in the ground base, and the frame is interconnected by racks monolithic reinforced concrete elements. 3 il.

Description

The invention relates to bridge construction and can be used to enhance slab-beam bridges with non-sprinkling foundations.

The purpose of the invention is to reduce the material and labor intensity of construction.

Figure 1 shows the described bridge, combined longitudinal section and front view; figure 2 - combined sections aa and bb in figure 1; on fig.Z - section bb In figure 1.

The reinforced girder bridge includes a slab-beam span structure 1, non-loose foundations with front walls 2 and opening walls 3, reinforcement structure in the form of two closed frames, upper girders 4 of which are monolithic With girder 1, lower girders 5 are supported on the base (natural, reinforced soil or pile, depending on the soil-geological conditions), and the pillars 6 are adjacent to the slope walls 3 and interconnected by monolithic reinforced concrete elements 7. The space between the lower girders 5 frames and a layer 8 fortified The bottom of the channel is filled with coarse stone material 9 to prevent erosion.

The upper girders 4 are more rigid compared to the split span structure 1, since the deflection W of the split beam by span I from a uniformly distributed load g is determined by

H

ABOUT

Yu

with

W 384

For the same beam, pinched from two ends, the expression of the deflection has the form

W 384

those. 5 times less. Therefore, they perceive a significant part of the temporary load, thereby unloading the extreme, most loaded plates of the superstructure 1. Reinforced concrete elements 7 are combined with the front walls 2 abutments and serve to transfer horizontal forces from the front wall 2 to the frame racks. The upper girders 4 and the lower girders 5 of the frames are spacers between the uprights 6, which work on horizontal forces like beams, clamped at both ends. If we compare the expressions for the maximum bending moment from a uniformly distributed

d I

loads g for a console of length I (M) and for a beam clamped at both ends,

L

span I2 (M). then it can be seen that the bending moment decreases 6 times. This allows, with identical sections, to have a construction 6 times narrower, i.e. from a solid rack-wall to make two separate stand64

| 2

ki The arrangement of reinforcement structures not under the span structure 1, but adjacent to it, allows one to simplify the technology of laying monolithic concrete, to exclude the jacking process.

Claims (1)

Invention Formula Reinforced girder bridge, including a slab-beam span structure, supports and reinforcement construction, characterized in that, in order to reduce the material intensity and labor-consuming construction, the reinforcement design is made in the form of pairs of frames, each of which is adjacent to the corresponding support and is made with an upper bolt and a lower bolt, which is located under the span and is monolithic with it, combined with 20 upper struts and a base recessed into the ground, the frames being interconnected in monolithic reinforced concrete poles by the elements. FIG. / LJ Bb Heaven J i o - f J