RU2164976C1 - Movement joint of bridge roadway - Google Patents

Abstract

FIELD: construction of bridge roadways and overpasses. SUBSTANCE: bridge roadways and overpasses have broken-stone filled movement joints at connection of spans, those with piers, and at approach sections of embankments with adapter slab. Novelty is that broken-stone fill is enclosed in roving glass- fabric shell with steel-fiber-concrete distributing slab on top. Broken-stone placed in shell may be impregnated with water-repelling flexible material. EFFECT: enhanced service life and repairability of joint; facilitated movement over bridge roadway joints. 2 cl, 1 dwg

Description

 The invention relates to the design of the carriageway of road bridges and overpasses in the interface zone of superstructures, superstructures with abutments, as well as the mates of approaching sections of embankments with a transition plate.

 The closest invention in technical essence is the expansion joint with crushed stone filling [1].

 The disadvantage of this design is the fragility of the seams.

 The objective of the invention is to increase the durability and maintainability of the seam, improving the comfort of travel in the interface zone of the roadway of the bridge.

 This task is achieved by the fact that in the expansion joint of the carriageway of the bridge with gravel filling, the gravel filling is enclosed in a cage of roving fiberglass, over which a steel-fiber-reinforced concrete distribution plate is laid.

 Crushed stone in the holder can be impregnated with a hydrophobic elastic material.

 The drawing shows a longitudinal section of an expansion joint.

 On the span 7, a leveling layer of concrete 4 is laid, then waterproofing 5 and a traditional drainage device. A waterproofing layer 6 is placed on the waterproofing, and the gap is closed by a cover 10. Crushed stone is laid in the thus prepared seam in a cage of fiberglass fabric 1, on top of which a sheet 9 of antifriction material is placed and a steel-fiber-reinforced concrete slab 2 is concreted. In the gap between the slab and the coating of the carriageway 3 put mastic 8.

This design has the following advantages:
- the gap between the spans is divided into two parts and, therefore, its size is half that of a conventional expansion joint;
- the joint between the steel-reinforced concrete slab and the pavement is located above the solid part of the span;
- crushed stone "pillow" in a holder made of roving fabric allows you to maintain a constant volume during vertical and horizontal movements;
- steel-fiber concrete slab has impact strength and abrasion an order of magnitude greater than reinforced concrete, and evenly distributes the force from the moving load on the crushed stone "pillow", increasing its durability;
- with a prefabricated steel-reinforced concrete slab, the maintainability of the seam is fully ensured.

 A positive effect from the use of the proposed expansion joint is to increase its durability by 1.5-2 times, increase the turnaround time and increase driving comfort (by reducing the impact when hitting a car’s wheel on a steel-fiber concrete “pillow”, since it rests on both spans, and crushed stone "pillow" plays the role of an elastic base for the slab, allowing you to perceive vertical movements of at least 15 mm).

Sources of information
1. Recommendations on the design of expansion joints with crushed stone filling. M., Union Health, 1987.

Claims (2)

 1. Deformation seam of the carriageway of the bridge with gravel filling, characterized in that the gravel filling is enclosed in a cage of roving fiberglass, on top of which a steel-fiber-reinforced concrete distribution plate is laid.  2. The design of the expansion joint according to claim 1, characterized in that the crushed stone in the holder is impregnated with a hydrophobic elastic material.