RU2476637C1 - Reinforcing structure of pier table of arched bridge span - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: reinforcing structure of a pier table of an arched bridge span includes arches that rest with their ends against permanent bridge supports, support stands, a beam grid, made of longitudinal and transverse beams and longitudinal beams of filling between spans, resting on longitudinal beams,- and a traffic area with movement joints. Under the transverse beam, which is extreme in the span and adjoins the pier table, there is a flat reinforcement truss mounted, attached to support stands, between the extreme transverse beam in the span that adjoins the pier table and the flat reinforcement truss there are additional longitudinal beams that rest on the flat reinforcement truss and are brought to the transverse beam arranged in the middle part of the span. On additional longitudinal beams there are additional transverse reinforcement beams installed, against which ends of longitudinal beams of filling between spans via tangential support parts of higher movements rest, and via wedged packages of steel sheets - ends of existing longitudinal beams adjoining the pier table of the span. The flat reinforcement truss has bearing capacity that is not lower than the bearing capacity of the transverse beam, which is extreme in the span and adjoins the pier table.

EFFECT: higher bearing capacity of an arched bridge span.

2 cl, 6 dwg

Description

The invention relates to bridge construction and can be used to strengthen the supporting section of the arch span of the bridge.

Known arched span, including arches, resting at their ends on the permanent supports of the bridge, support pillars, beam cage, consisting of longitudinal and transverse beams and longitudinal beams of inter-span filling, based on longitudinal beams, and the carriageway with expansion joints / 1 /. Elements of the arch span were reinforced by placing prestressed high-strength reinforcement in the beam cage of the carriageway and the use of ropes connecting the semi-arches.

The aforementioned reinforcement structures cannot be used to reduce the bearing capacity due to corrosion damage to the nodes of the longitudinal and transverse beams located under the expansion joints. As a result of leakage of the expansion joints, massive leakages of water from the roadway to the underlying metal structures occur.

The objective of the present invention is to strengthen the beam cells in the zones of expansion joints and in structures located in the area of the supporting section of the arch span of the bridge.

The problem is solved due to the fact that in the construction of reinforcing the support section of the arch span, including arches, resting at their ends on the permanent bridge supports, support pillars, beam cage, consisting of longitudinal and transverse beams and longitudinal beams of inter-span filling, based on longitudinal beams , and the carriageway with expansion joints, under the extreme in the span of the transverse beam adjacent to the support section, mounted a flat reinforcement truss attached to the support posts, between In the span, the transverse beam adjacent to the support section and the flat reinforcement truss have additional longitudinal beams resting on a flat reinforcement truss and suspended from the transverse beam located in the middle of the span, with additional transverse reinforcing beams installed on the additional longitudinal beams, on which through the tangential supporting parts of increased displacements, the ends of the longitudinal beams of the span filling are supported and, through the wedged packages of steel sheets, the ends are existing x longitudinal beams adjacent to the support section of the span.

A flat reinforcement truss has a bearing capacity not lower than the bearing capacity of the extreme in-span transverse beam adjacent to the support section.

The invention is illustrated by drawings, where:

- figure 1 shows a fragment of the arch span of the bridge with schematically shown structures reinforcing the support section, side view;

- figure 2 is a cross-section aa in figure 1 (gain design is not shown);

- figure 3 shows a flat truss reinforcement with additional longitudinal beams, a view along the axis of the bridge;

- figure 4 shows an additional longitudinal beam with transverse reinforcement beams and resting on them longitudinal beams of span filling, side view;

- figure 5 shows the bearing of the longitudinal beams of the span filling on the transverse beams of reinforcement, view along the axis of the bridge;

- figure 6 shows the bearing of the longitudinal beams of the beam cells on the transverse reinforcement beams, view along the axis of the bridge.

An arched span consists of arches 1, resting at their ends on permanent supports 2, support pillars 3, longitudinal 4 and transverse 5 beams of the beam cage, longitudinal beams of inter-span filling 6, based on the transverse beams 5, and the carriageway 7 with expansion joints (not shown).

As a result of the survey, the following shortcomings of the existing arch span were revealed: a decrease in bearing capacity due to corrosion damage to the nodes of the longitudinal and transverse beams located under the expansion joints. As a result of leakage of the expansion joints, massive leakage of water from the roadway to the underlying metal structures occurred. The tables 8, mounted on the longitudinal beams 4, rusted and could not bear the load from the longitudinal beams of the span filling 6.

To eliminate the above disadvantages, the support section of the arch span was strengthened. For this purpose, a flat reinforcing truss 10 attached to the support posts 3 was mounted under an extreme transverse beam 9 adjacent to the abutment section 3. The bearing capacity of this flat reinforcing truss 10 has a bearing capacity not less than the carrying capacity of the extreme transverse beam 9 adjacent to the abutment section in order to absorb the load in case of destruction of the latter, that is, a flat reinforcement truss 10 duplicates the extreme transverse beam 9 in the span adjacent to the abutment section. Between the flat reinforcing truss 10 and the extreme in the span transverse beam 9 adjacent to the support section, additional longitudinal beams 11 are installed, resting at one end on the flat reinforcing truss 10, suspended with their other end to the transverse beam 12, located in the middle part of the span. On top of a number of installed additional longitudinal beams 11, additional transverse beams 13 are mounted, on which the ends of the longitudinal beams of the span filling 6 are supported through the tangential supports of increased displacements 6. The ends of the longitudinal beams 4 adjacent to the support section are supported by additional transverse beams 13 with the purpose of a tight fit using wedged packages of steel sheets 15.

It should be noted that additional longitudinal beams 11 perform a dual function: on the one hand, they allow you to transfer forces from the extreme in the span of the transverse beam 9 adjacent to the support section to a flat truss reinforcement 10, excluding the extreme in the span of the transverse beam 9 adjacent to the support section , from work, and on the other hand serve as the basis for additional transverse beams 13.

The completed reinforcement constructions will make it possible to completely duplicate the structures of the beam cell in the support section with new elements without significant dismantling of the structures and without stopping the movement on the bridge. Mounted reinforcement structures completely excluded from work the most damaged beam cell structures in the supporting part of the arch span.

Information sources

1. USSR Copyright Certificate No. 178393, cl. Е01D 21/02, priority from 11/14/1964.

Claims (2)

1. The reinforcement structure of the supporting section of the arch span, including arches, resting at their ends on the permanent bridge supports, support stands, beam cage, consisting of longitudinal and transverse beams and longitudinal beams of inter-span filling, based on longitudinal beams, and the carriageway with expansion joints characterized in that under the extreme in the span of the transverse beam adjacent to the support section, a flat reinforcement truss is mounted, attached to the support posts, between the extreme in the span of the transverse An additional beam, adjacent to the support section, and a flat reinforcing truss, have additional longitudinal beams resting on a flat reinforcing truss and suspended from a transverse beam located in the middle of the span, with additional transverse reinforcing beams installed on additional longitudinal beams, through which they are tangentially supported parts of increased displacements support the ends of the longitudinal beams of the span filling and through the wedged packages of steel sheets - the ends of the existing longitudinal beams, adjacent nai to the support section of the superstructure. 2. The reinforcement design of the support section of the arch span according to claim 1, characterized in that the flat reinforcement truss has a bearing capacity not lower than the bearing capacity of the transverse beam extreme in the span adjacent to the support section.

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