RU92027U1 - PRE-STRESSED BEAM OF THE SPAN STRUCTURE OF THE ROAD BRIDGE - Google Patents

Abstract

1. Pre-stressed beam span of the road bridge containing a wall and a slab, characterized in that the wall of the span beam in support sections is made with a thickness of not less than 350 mm at a length of not less than 0.1 of the length of the beam on each side to ensure its operation on the main voltages determined by the formula:! ! where σmc, σmt are the main compressive and tensile stresses,! σbx - normal horizontal stresses,! σby - normal vertical stresses,! τb - tangential stresses,! and tangential stresses by the formula: τb = τq + τt≤mb6Rb, sh, where! τq - shear stress from shear force,! τt is the shear stress from torsion,! Rb, sh is the calculated concrete resistance,! mb6 is the reliability coefficient; ! while the transitional wall section from the thickened supporting section to the middle part of the section has a slope of 1:16 to 1:20. ! 2. The prestressed beam of the superstructure of the road bridge according to claim 1, characterized in that, in combination with other similar beams, forms a continuous system by combining them along the entire length of the high-strength reinforcement passed in the body of the beams.

Description

The utility model relates to the field of bridge construction and relates to the construction of superstructures of reinforced concrete road bridges.

Known beam reinforced concrete span bridge, containing a slab and a wall of constant cross-sectional length (VN Baykov. Building structures. M, "Higher School", 1976, p.323, Fig. XV1.3).

The disadvantage of the design is that it does not meet the requirements for strength at high loads, as well as its high material consumption and the inability to use in continuous systems.

The objective of the utility model is to increase the strength and crack resistance of the span beams at modern high loads, increase the distance between the beams in the span and the possibility of the formation of continuous systems from prestressed split beams by combining them along the entire length of the high-strength reinforcement passed in the body of the beams.

The technical result of the proposed utility model is achieved by the fact that in the prestressed beam of the span of the road bridge containing the wall and the plate, the wall of the span of the span in supporting sections is made with a thickening of at least 350 mm over a length of at least 0.1 of the length of the beam on each side to ensure its work on the main stresses, determined by the formula:

where σ _mc , σ _mt are the main compressive and tensile stresses,

σ _bx - normal horizontal stresses,

σ _by - normal vertical stresses,

τ _b - shear stresses

and shear stresses according to the formula: τ _b = τ _q + τ _t ≤m _b6 R _{b, sh} ,

where τ _q is the shear stress from the shear force,

τ _t is the shear stress from torsion,

R _{b, sh} is the design resistance of concrete,

m _b6 is the reliability coefficient.

The transition wall section from the thickened supporting section to the middle part of the section has a slope of 1:16 to 1:20. In conjunction with other similar beams, the proposed prestressed span beam has the ability to form continuous systems from prestressed split beams by combining them along the entire length with high-strength reinforcement passed in the body of the beams.

The essence of the proposed utility model is illustrated by drawings, where

figure 1 shows a view from the side of the beam of the T-section,

figure 2 shows a longitudinal section of the beam (aa in figure 2),

on fit.3 shows a view from the end of the beam of the T-section,

figure 4 shows a continuous span formed from the beams of the proposed design.

The prestressed beam of the bridge span consists of plate 1 and wall 2. At both ends of the beam, the wall has a bulge 3 at a length of at least 0.1 of the length of the beam on each side. The transitional section of the wall 4 from the thickened supporting section 3 to the middle part of section 5 has a slope of 1:16 to 1:20. In combination with other similar beams, the proposed prestressed span beam can form a continuous system of prestressed split beams by combining them along the entire length of high-strength reinforcement 6, passed in the body of the beams.

Using the proposed utility model, it is possible to withstand modern increased loads while reducing the material consumption of the beam of the bridge span, increase its bearing capacity, and also allows the formation of continuous systems from prestressed split beams.

Claims (2)

1. Pre-stressed beam span of the road bridge containing a wall and a slab, characterized in that the wall of the span beam in support sections is made with a thickness of not less than 350 mm at a length of not less than 0.1 of the length of the beam on each side to ensure its operation on the main stresses determined by the formula:

, where σ _mc , σ _mt are the main compressive and tensile stresses, σ _bx - normal horizontal stresses, σ _by - normal vertical stresses, τ _b - tangential stresses, and tangential stresses by the formula: τ _b = τ _q + τ _t ≤m _b6 R _{b, sh} , where τ _q - shear stress from shear force, τ _t is the shear stress from torsion, R _{b, sh} is the design resistance of concrete, m _b6 is the reliability coefficient; while the transitional wall section from the thickened supporting section to the middle part of the section has a slope of 1:16 to 1:20. 2. The prestressed beam of the superstructure of the road bridge according to claim 1, characterized in that, in combination with other similar beams, forms a continuous system by combining them along the entire length of high-strength reinforcement passed in the body of the beams.