SU1362769A1 - Bridge span structure - Google Patents

Abstract

This invention relates to bridge construction. The aim of the invention is to reduce the metal consumption of the superstructure. The span of the bridge includes metal main beams 1, reinforced concrete slab 2, Sprengel 3, horizontally flexible devices 4 for fixing slab 2 on main beams 1, rigid fixture 5 for fixing slab 2 in the central part, imeyr1; its length is 1 / 20- 1/30 of the span length, supporting diaphragms 6, projecting above the upper ones along the main beams 1 themselves, on which the plate 2 is supported with the possibility of longitudinal displacements. The ratio of slab thickness to the height of the main beams is from 1/10 to 1/15. The design is prestressed with a spindle 3 of high-strength cables. Horizontally compliant devices 4 serve to secure plate 2 from buckling and keep it from lateral shearing relative to beam 1. When shrinkage and creep deformation proceeds, the end of plate 2 is freely displaced relative to beam 1. When tension is applied to the spindle shaft, plate 2 is crimped and a moment occurs in beam I , the reverse of the moment from the external load. 3 il. (/) 77/777 oo 05 tsD About CO

Description

The invention relates to bridge construction and can be used primarily in spans of road bridges.

The purpose of the invention is to reduce the metal intensity of the superstructure.

FIG. 1 shows the bridge span; FIG. 2 is the same, with a trapezoidal arrangement of the sprengel; in fig. 3 - continuous bridge span with sprengel.

The span of the bridge includes metal main beams 1, reinforced concrete slab 2, Sprengel 3, horizontally compliant fixtures 4 for fixing plate 2, rigid fixture 5 in fixing plate 2 in the central part, supporting diaphragms 6 bred above the upper beams 1, Thickness ratio the slab 2 to the height of the main beams 1 is from 1/10 to 1/15.

Reinforced concrete plate 2 is placed on horizontally flexible devices 4 n on rigid device 5, located on the center of metal beam 1 and supporting diaphragms 6. In the middle part of the span plate 2 is attached to beam 1 by rigid device 5, the length of which is assigned depending on the braking forces and the way of tensioning the sprengel and is between 1/20 and 1/30 of the span length. .

The structure is prestressed with a high-strength rope sprengel. The horizontally compliant devices 4 serve to secure the plate 2 from buckling and keep it away from the transverse shear relative to the beam 1.

When the flow of shrinkage deformations: and creep, the end of the shit is 2

is shifted relative to the beam I, in order to facilitate the work of the plate 2 in the zone of transfer of concentrated effort to it. from sprengel 3, the plate in this zone is supported on the supporting diaphragm 6 with the possibility of longitudinal displacements.

When tensioning the sprengel 3, the iron-concrete plate 2 is crimped, and in the metal beam 1 a moment occurs that is inverse to the moment from the external load. The use of the proposed construction reduces the metal capacity of the superstructure, expands the range of use of iron-iron-1 concrete structures in bridge construction,

F o rmula of the invention

0

The span of the bridge, including metal main beams with supporting diaphragms, a reinforced concrete slab with devices for fixing it on the main beams, a push-pull tightening anchored by the ends on the end faces of the reinforced concrete slab and associated with the main beams in the lower part, characterized in that, in order to reduce the metal consumption of the span, the fixture for fixing the plate in the central part of the span is rigid and has a length equal to 1 / 20-1 / 30 of the span length, and the remaining fixtures the fixings of the slab are horizontally flexible, with the supporting diaphragms protruding above the upper main beams themselves, and the plate is supported by the ends of these diaphragms with the possibility of longitudinal movements, and the ratio of the thickness of the slab to the height of the main beams is from 1/10 to 1/15,

five

0

// uh ////

Phage.g

7 // 7777/7

Compiled by V.Gonik Editor M.Nedoluzhenko Tehred M.Didyk

Subscription

Order 6350/18 Circulation 489iiuM i

VNIIPI USSR State Committee

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

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

Fi. J

Proofreader V.Girn to

Subscription

Claims (1)

Formula isobl - beams The span of the bridge, which includes metal main with supporting diaphragms, reinforced concrete slab with devices for fixing it on the main beams, truss tightening, anchored by the ends on the end faces of the reinforced concrete slab and connected with the main beams in their lower part, characterized in that, in order to reduce the metal span of the span, the device for fixing the plate in the central part of the span is rigid and has a length equal to 1 / 20-1 / 30 of the length of the span, and the rest of the device for fixing the plate made horizontally malleable, while the supporting diaphragms protrude above the upper zones of the main beams, and the plate is supported by the ends on these diaphragms with the possibility of longitudinal movements, and the ratio of the thickness of the plate to the height of the main beams is from 1/10 to 1/15.