RU2418907C1 - System to attach board of ballast-free railway bridge floor to longitudinal beam of bridge span - Google Patents

Abstract

FIELD: construction. ^ SUBSTANCE: available system for attachment of ballast-free railway bridge floor board to a longitudinal beam of the bridge span, comprising a board of the ballast-free railway bridge floor attached to the upper shelf of the longitudinal beam of the bridge span, and an inner layer arranged between them, additionally includes plates hingedly joined with each other into triangular levers and arranged between the board of ballast-free railway bridge floor and the upper shelf of the longitudinal beam of the bridge span, and each plate has a common point of fixation with the neighbouring plate to the upper shelf of the longitudinal beam of the bridge span or to the plate of the bridge floor, at the same time the inner layer is formed with discrete elements, every of which is arranged between long lateral sides of neighbouring plates at the side of their fixation to the upper shelf of the longitudinal beam of the bridge span. ^ EFFECT: increased durability of ballast-free bridge floor and inner layer between plates of ballast-free bridge floor and the longitudinal beam of the bridge span. ^ 6 cl, 2 dwg

Description

The present invention relates to bridge structures and can be used when laying railway tracks on the bridge.

Known (RU patent No. 52013 U1), adopted as a prototype, a traditional system for attaching a plate of ballastless bridge bridge structure (BMP) to the longitudinal beam of the bridge span structure, including the plate of ballastless bridge bridge cloth attached to the longitudinal beam of the bridge span structure, and the gasket layer, located between the lower surface of the plate of ballastless bridge bridge and the upper shelf of the longitudinal beam of the bridge span.

The disadvantage of this design is the presence of sections with rigid hairpin attachment of a plate of ballastless bridge bridge to the longitudinal beam of the bridge span, as a result of which tensile stresses dangerous for concrete arise inside the plate due to passing rolling stock, leading to cracking and gradual exit of the plate out of service. In this case, cracks develop in the longitudinal beam of the bridge span. In addition, experiencing a constant load due to the tightening of high-strength studs with which the plate is attached to the longitudinal beam of the bridge span, the laying layer is destined to ensure a given smooth deflection (convexity) of the BMP flooring from the edges of the bridge to the middle.

These phenomena do not cause an immediate failure of the ballastless bridge web, however, they complicate the operation of the structure and can lead to an emergency situation and the cost of maintaining the bridge when the train load is exposed.

The objective of the present invention is to ensure trouble-free rail traffic.

The technical result that can be obtained by the implementation of the claimed invention is to increase the durability of ballastless canvas and a laying layer between BMP plates and the longitudinal beam of the bridge span.

The specified technical result in the implementation of the invention is achieved due to the fact that the known system for attaching a plate of ballastless bridge bridge to the longitudinal beam of the bridge span structure, including a plate of ballastless bridge bridge cloth, attached to the upper shelf of the longitudinal beam of the bridge span structure, and a spacer layer located between them , additionally contains located between the plate ballastless railway bridge and the upper shelf about the span beam of the bridge span pivotally connected to each other in the triangular levers of the plate, each of which has one common point of attachment to the upper flange of the longitudinal beam of the bridge span or to the bridge plate with the adjacent plate, while the spacer layer is formed by discrete elements, each of which is located between the long lateral sides of adjacent plates from the side of their attachment to the upper shelf of the longitudinal beam of the bridge span.

As a result of the application of the claimed system for attaching a plate of ballastless bridge bridge to the longitudinal beam of the bridge span using a system of plates (lamellas) connected to each other with the formation of a lever system, in contrast to that used in the prototype:

- bridge slabs are completely free from constant loads caused by tightening high-strength studs;

- eliminated pinching the edges of the plates with studs and the creation of dangerous stresses when a temporary load is applied from a passing rolling stock;

- the gasket layer is completely freed from constant load due to the tightening of high-strength studs, with which the plates in traditional systems are attached to the longitudinal beams of the bridge span structure, are not deformed, retains its original physicomechanical properties, as a result of which it effectively dampens the BMP.

The lever system plates used in the fastening system can be made of steel and can have a V-shaped transverse profile to increase compression resistance.

The mounting holes in the upper shelf of the longitudinal beam of the bridge span and the plate of ballastless railway bridge fabric are usually made in a row with the same pitch, while the rows of holes in the bridge plate of the ballastless bridge bridge and the upper shelf of the longitudinal beam of the bridge span are parallel and offset along horizontal relative to each other half this step

An additional technical result - the manufacturability of the structure is achieved due to the fact that the claimed system of plate attachment involves the use of existing and applicable structures of BMP plates, namely:

- for attaching the plates to the plate of ballastless railway bridge canvas, the technological holes available in it are used for fastening the countersink;

- for attaching the plates to the upper shelf of the longitudinal beam of the bridge span, the holes existing in it for high-strength studs used in the traditional system for attaching the plate of ballastless bridge bridge to the longitudinal beam of the bridge span are used.

The drawings show:

Figure 1 is a top view of the attachment system;

Figure 2, a) is a sectional attachment system;

Figure 2, b) is a top view of the lamella system.

Below on a particular example of the execution of the claimed design provides information confirming the possibility of carrying out the invention with the receipt of the above technical results.

The plate 1 of the ballastless railway bridge with track rails 2 is fastened to the longitudinal beam 3 of the bridge span by means of steel plates (lamellas) 4, connected to each other by hinges into triangular levers with the formation of an oblique lever system. To the longitudinal beam (upper flange of the longitudinal beam) of the bridge span, each plate is fastened with a short bolt 5 through the hole in the upper flange of the longitudinal beam, each plate is fastened to the BMP by bolt 6 of the counter-link 7. Each plate of the system has one common attachment point to the subsequent adjacent plate the longitudinal beam of the bridge span, and with the adjacent previous plate - one common point of attachment to the bridge plate. Holes for fasteners in the upper flange of the longitudinal beam of the bridge span and holes for bolts for fastening counter-wings (they are also holes for fastening counter-wings to BMP) are made with the same pitch. The rows of mounting holes in the bridge plate and the upper flange of the longitudinal beam are parallel and offset horizontally relative to each other by half this value (half step). Each of the plates has a V-shaped transverse profile for resistance to compression. The gasket layer 8 between the longitudinal beam and the BMP is formed by discrete circular cushioning elements, each of which is located between the long lateral sides of two adjacent lamellas from the side of their fastening to the beam of the bridge span.

The main body of the cushioning element may consist of wood or multilayer plywood impregnated with moisture-proof compounds, composite material or concrete, the upper layer of the gasket (in contact with the BMP) is made of shock-absorbing material (for example, rubber or polyurethane).

In the proposed fastening system, standard technological holes are used to fasten the lamellas to the upper flange of the longitudinal beam of the bridge span, into which high-strength studs are passed with a typical fastening option (see prototype).

The claimed system of fastening the plate ballastless railway bridge to the longitudinal beam of the span of the bridge works as follows.

When braking or accelerating the rolling stock passing over the bridge, the BMP experiences a horizontally directed load 9, which is transmitted through the bolt of the countersink to the lamella system connected to each other with the formation of a lever system that holds the BMP in place due to the reaction forces 9 '(Fig. 2 b). Vertical movement 10, 11 (figure 2, a.) BMP cause a response of 10 ', 11' (figure 2, a), respectively, of the lever system.

Steel plates (lamellas), combined into a lever system, as shown in the drawings, perform two functions:

1) restrict due to its elastic properties BMP movements in the vertical direction that occur when exposed to periodic alternating load from the rolling stock;

2) prevent the BMP from shifting in the horizontal direction, which can occur during acceleration / deceleration of rolling stock while passing along the bridge.

Claims (6)

1. The system for attaching a plate of ballastless bridge bridge to the longitudinal beam of the bridge span structure, including a plate of ballastless bridge bridge cloth attached to the upper shelf of the longitudinal beam of the bridge span structure, and a spacer layer located between them, characterized in that it further comprises between the plate ballastless railway bridge web and the upper flange of the longitudinal beam of the bridge span articulated to each other in triangular levers of the plate, each of which has one common point of attachment to the upper flange of the longitudinal beam of the bridge span or to the plate of the bridge web with the adjacent plate, while the spacer layer is formed by discrete elements, each of which is located between the long lateral sides of adjacent plates on the side of them fastenings to the upper shelf of the longitudinal beam of the bridge span. 2. The plate attachment system according to claim 1, characterized in that for attaching the plates to the plate of a ballastless railway bridge web, the technological holes existing therein are used for attaching a countersink. 3. The plate mounting system according to claim 1 or 2, characterized in that for attaching the plates to the upper shelf of the longitudinal beam of the bridge span, using the mounting holes therein. 4. The plate attachment system according to claim 1, characterized in that the mounting holes in the upper flange of the longitudinal beam of the bridge span and the ballastless railway bridge slab are made in a row with the same pitch, while the rows of holes in the bridge plate of the ballastless railway bridge and the top the shelf of the longitudinal beam of the bridge span is parallel and offset horizontally relative to each other by half this step. 5. The plate attachment system according to claim 1, or 2, or 4, characterized in that the plates are made of steel. 6. The plate attachment system according to claim 1, or 2, or 4, characterized in that the plates have a V-shaped transverse profile.

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