Metal superstructure bridge with welded by

 

(57) Abstract:

The invention relates to the field of bridge engineering, in particular to the design of the metal superstructure of the bridge with a seamless way. Metal superstructure bridge with welded by contains two main farm, related links and relies on support through the movable and stationary support part, roadway, consisting of ballastless bridge deck in the form of a flat concrete blocks attached to them rails and longitudinal beams, pribalenych attached to the nodes of the driving belt of the main trusses transverse beams. Blocks at site 1 of the superstructure is rigidly connected with the longitudinal beams, and at site II laid on longitudinal beams through a pad of friction material with a device on the bottom surface of the block of metal embedded parts, equipped with limit switches. Technical result provided by the invention, consists in the reduction in the rails jointless tracks the longitudinal force resulting from the joint work of the superstructure and rails from changes in ambient temperature and avoid large gaps in the field of accidental fracture of rails. 4 silt. the build a lattice structure, having two main farm with relationships between them and the roadway, consisting of ballastless bridge deck (made of flat blocks of reinforced concrete slab and connected to the nodes of the driving belt farms transverse beam supported on longitudinal beams, which are fixed blocks slabs [1] . The disadvantage of this solution is the large temperature longitudinal force in the rails jointless tracks mounted on reinforced concrete slab along the entire length of the superstructure due to the joint work of the superstructure and rails.

Known solution [2] was chosen for the prototype on which to exclude collaboration metal superstructure having two main farm with connections between them, resting on the supports through the movable and stationary support part, and the roadway of the ballast bridge deck on the cross and longitudinal and transverse beams, the length of the span of more than 15 m connection of the deck with longitudinal beams roadway arranged longitudinally movable. The disadvantage of this solution in a significant gap in place of random kink rail at low temperatures in the absence of pinning mateyunas jointless tracks on the bridge. Arranged to prevent this surge devices in rail tracks, providing free deformation of the rails on the bridge, cause difficulties in operation.

The objective of the invention is the reduction in the rails continuous jointless tracks on the bridge longitudinal force resulting from the joint work of the superstructure and rails ballastless slab bridge deck from changes in ambient temperature, avoiding large gaps in the field of accidental fracture of rails, at the expense of the device longitudinally-movable joint concrete slab ballastless bridge deck and the longitudinal beams of the roadway on the length of the superstructure from its end resting on the movable support parts. This is achieved due to the fact that the metal span building bridge with welded by containing two main farm with relationships between them and the roadway of ballastless bridge deck, the longitudinal and transverse beams supported on the supports through the movable and stationary support part, on the length of the superstructure from its end resting on the movable support parts, concrete slab baseballist is a, moreover, in places bearing plate through the spacer installed side limiters from the transverse displacements of the plate, and the rest of the length of the superstructure plate fixed to the longitudinal beams rigidly.

In Fig. 1 shows a diagram of the proposed superstructure, the facade of Fig. 2 - cross sections a-a and b-b of Fig. 3 node a in Fig. 2; Fig. 4 - node B in Fig. 2.

Metal superstructure bridge with welded by contains two main farm 1, which are interconnected by the links 2 and resting on the supports through 3 mobile and stationary 4 basic parts, roadway, consisting of ballastless bridge deck in the form of a flat concrete blocks 5 mounted on them rails 6 and the longitudinal beams 7, pribalenych attached to the nodes of the driving belt of the main trusses transverse beams 8, and blocks 5 at site 1 of the superstructure is rigidly connected with the longitudinal beams 7 by means of high strength bolts 9, tighten after hardening of the cement-sand mortar 10, the site II laid on longitudinal beams 7 through the installation of antifriction material 11 with the device on the bottom surface of the block 5 metal embedded parts 12, with ogranicite, for example, raising the temperature of the superstructure 1 is extended in the direction of the movable support parts 3 and at site 1 of the superstructure there are the forces of interaction between the rails 6 and spans 1, leading to the emergence of the longitudinal force in the rail 6, while in section II due to the lack of interaction forces efforts in the rails 6 does not occur, and the magnitude of the disclosure gap accidental fracture of the rail is limited due to the presence on site 1 hard links between the rails 6 and the longitudinal beams 7 of the superstructure.

The proposed structure of the metal superstructure gives the chance to reduce the rails continuous jointless tracks on the bridge longitudinal force resulting from the joint work of the superstructure and rails ballastless slab bridge deck from changes in ambient temperature, avoiding large gaps in the field of accidental fracture of rails, thus increasing the reliability and safety of operation of the facility.

Sources of information:

1. Bridges and tunnels on the Railways. Ed. by C. O. Osipov, M., Transport, 1988, S. 367.

2. Standards for the design of bridges Germany DS 820/820 01 Deut the two main farm, interconnected resting on a support through the movable and stationary support part, and a roadway consisting of ballastless bridge deck in the form of a flat concrete blocks attached to them rails and longitudinal beams, pribalenych attached to the nodes of the driving belt of the main trusses transverse beams, characterized in that the length of the superstructure from its end resting on the movable support parts, concrete slab ballastless bridge deck laid on longitudinal beams through seals made of antifriction material, in places the bearing plate through the spacer installed side limiters from the transverse displacements of the plate, and the rest of the length of the superstructure plate fixed to the longitudinal beams rigidly.

 

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