SU885404A1 - Bridge - Google Patents

Description

(54) BRIDGE

I

The invention relates to a bridge construction and can be used in the construction of prestressed reinforced concrete split bridges.

A bridge is known that includes a pre-stressed span structure with a shear bolt.

The disadvantage of this bridge lies in its increased metal intensity, reduction of the bridge clearance, and increased labor intensity of installation, due to the presence of the transponder hook.

The closest to the proposed is a bridge that includes supports and split span structures installed on them, made of tensioned reinforced concrete beams, and to ensure the required pre-compression of the span structures, the beam is provided with a reinforcement 2 positioned at the bottom.

The disadvantage of the known bridge lies in its increased metal intensity and labor intensity of production, due to the presence of prestressed reinforcement in reinforced concrete beams.

The purpose of the invention is to reduce the metal consumption and the laboriousness of making a bridge by eliminating the prestressed reinforcement of reinforced concrete beams.

This goal is achieved by the fact that the bridge, which includes the supports and the split spans installed on them, made of straps

IS of reinforced concrete beams, provided with spacer, wedge and fixing elements, and the end sections of reinforced concrete beams facing each other adjacent span structures are made

Claims (2)

30 with niches in their lower part, with spacers rigidly fixed on facing end faces of niches with a gap one relative to the other and supported on respective supports, and each wedge element is installed with a gap relative to the upper edge of the corresponding niche between a pair of corresponding spacer elements with the ability to interact with them with an effort equal to the magnitude of the calculated force of the preliminary reduction, with the fixing elements placed in the gaps between the upper edges of the niches and the corresponding wedge elements. FIG. 1 shows the end portion of a current of a reinforced concrete beam with a niche; in fig. 2 shows section A-A in FIG. one; FIG. 3 shows the assembly on the support of the adjacent split span structures of the bridge. The bridge contains supports, split span structures installed on them, made of tensile reinforced concrete beams 2, spacer 3, wedge 4 and fixing 5 elements End sections facing each other 6 reinforced concrete beams 2 adjacent span structures with niches 7 in the bottom parts. Spacer elements 3 are rigidly fixed on facing end faces of niches 7 with a gap relative to each other and supported on corresponding supports 1, and each V-wedge element 4 is installed in the gap between a pair of corresponding spacer elements 3 with a gap relative to the upper holes of niches and interacts with spacers with a force equal to the calculated force of pre-compression of the reinforced concrete beams 2. To ensure close mutual contact with the wedge element, each expansion element is made with mowing the edge, corresponding to the angle of inclination of the faces of the wedge element. The locking elements 5 are placed between the upper faces of the niches 7 and the corresponding wedge element 4 and are intended for fixing the position of the wedge elements against possible displacements from dynamic and temperature effects and relaxing the force of preliminary reduction. In order to provide crack resistance at the stages of transportation and installation, reinforced concrete beams are made in the lower along the cross section of reinforced concrete beams to install a certain amount of temporary tension reinforcement (not shown). The process of pre-crimping the extended zones of the beams 2 by wedging them with the wedge elements 4 is carried out using jacks or weights that provide controlled vertical movement of the wedge element. The proposed bridge design reduces the steel consumption and labor-intensiveness of the construction of the superstructures due to the failure of reinforced concrete beams with prestressing reinforcement. BACKGROUND OF THE INVENTION A bridge including supports and split spans mounted on them made of tensioned reinforced concrete beams, so that, in order to reduce the metal intensity and complexity of the manufacture of the bridge by eliminating the stress reinforcement pre-reinforced concrete beams, bridges equipped with spacers; wedge and fixing elements, and facing each other end sections of reinforced concrete beams of adjacent spans are outlined with three niches in their lower parts, with spacers rigidly fixed on facing end faces of niches with a gap one relative to the other and supported corresponding supports, and each wedge element is installed with a gap relative to the upper edge of the corresponding niche between a pair of corresponding spacer elements with the ability to interact with them with a force equal to the values The design force of the preliminary reduction of the beams, while the fixed 1st elements are placed in the gaps between the upper faces of the niches and the corresponding wedge elements. Sources of information taken into account during the examination 1. P. Franchik and M. Tohachek. Pre-stressed steel structures. M., stroiizdat, 1979, p. 3 1-312. 2. Kryltsov E.I. etc. Modern reinforced concrete bridges. M., Transport, 1974, p. 91.