RU-2861416-C1 - PERMANENT FORMWORK DEVICE OF BRIDGE STRUCTURE AND METHOD FOR WIDENING BRIDGE STRUCTURE USING SAID DEVICE

Abstract

FIELD: bridge building. SUBSTANCE: invention can be used for widening and insulating the superstructure and the roadway by means of a permanent formwork on both sides of the superstructure in the form of a cantilever. The permanent formwork of a bridge structure consists of U-shaped beams, paired transversely to the beams of the superstructure on both sides, forming cantilever parts outside it. Each pair of beams is united in the cantilever parts by means of overlay anchor devices and a crossbar welded to the U-shaped beams to form a rigid structure. The overlay anchor devices are located between the U-shaped beams and consist of two U-shaped channels welded together along their larger side to form an I-beam, and angles welded to the outer side of the I-beam from the inside. In the central part of the overlay anchor devices, two holes are made at a distance from each other for passing ropes therethrough. The ropes are located along all paired transverse U-shaped beams from the inside of each pair, and on the outside of the cantilever parts they are fixed with anchor devices for fixation after tensioning the ropes. Plates made of foam glass crushed stone in a basalt composite mesh are attached to the cantilever parts of the formed structure from below by means of staples and tying wire. The method for widening a bridge structure using a permanent formwork consists in that on both sides of the superstructure, U-shaped beams are preliminarily fixed in pairs with staples to form cantilever parts, which are then interconnected in the cantilever parts by installing and welding the overlay anchor devices and crossbars, which are welded transversely to the U-shaped beams. The overlay anchor devices are made by welding two U-shaped channels along the larger side to form an I-beam and welding the angles to the outer side of the I-beam from the inside. Then, holes are drilled at a distance from each other in the overlay anchor devices, through which ropes are passed transversely across the entire superstructure along each pair of U-shaped beams from the inside of each pair. Then, on the outside of the cantilever parts, the ropes are fixed with anchor devices after their tension. After that, plates made of foam glass crushed stone in a basalt composite mesh are fastened to the cantilever parts of the formed structure from below using tying wire to the crossbars, as well as with staples encompassing the ropes and passing through the thickness of each plate, then fixed with clips. Next, the cantilever part of the formed structure is concreted. EFFECT: creation of a permanent formwork device with thermal insulation characteristics and simplification of the bridge widening method. 2 cl, 2 dwg

Inventors

• Kazarian Vilgelm Iurevich

Dates

Publication Date

20260505

Application Date

20250919

Claims (2)

1. 1. A permanent formwork for a bridge structure consisting of U-shaped beams, fixed in pairs across the beams of the superstructure on both sides, with the formation of cantilever parts beyond it, wherein each pair of beams is united in the cantilever parts by means of overlay anchor devices and a crossbar welded to the U-shaped beams to form a rigid structure, wherein the overlay anchor devices are located between the U-shaped beams and consist of two U-shaped channels, connected to each other by welding along their larger side to form an I-beam, and angles welded to the outer side of the I-beam from the inside, and in the central part of the overlay anchor devices two openings are made at a distance from each other for passing ropes through them, wherein the ropes are located along all paired U-shaped crossbeams from the inside of each pair, and on the outer side of the cantilever parts they are secured by anchor devices for fixing after tensioning the ropes, in addition, to The cantilever parts of the formed structure are secured from below with slabs of foam glass crushed stone in a basalt composite mesh using staples and binding wire.
2. 2. A method for widening a bridge structure using permanent formwork according to paragraph 1, which consists in the fact that U-shaped beams are first fastened in pairs on both sides of the superstructure with brackets to form cantilever parts, which are then connected to each other in the cantilever parts by installing and welding overlay anchor devices and crossbars that are welded across the U-shaped beams, wherein the overlay anchor devices are made by welding two U-shaped channels along the longer side to form an I-beam and welding corners to the outside of the I-beam from the inside, then holes are drilled at a distance from each other in the overlay anchor devices through which cables are pulled across the entire superstructure along each paired U-shaped beams from the inside of each pair, then from the outside of the cantilever parts the cables are fixed with anchor devices after they are tensioned, after which the cantilever parts of the formed structure are The foam glass crushed stone slabs are secured from below in a basalt composite mesh using binding wire to the crossbars, as well as with staples that cover the ropes and pass through the thickness of each slab, then secured with clips, and then the cantilever part of the resulting structure is concreted.

Description

The invention relates to bridge construction and can be used in the reconstruction of a bridge structure, in particular for widening and insulating the span structure and roadway. Russian Federation Patent No. 2205914, "Method for Widening a Bridge Structure," is known. The invention relates to bridge construction and can be used in bridge reconstruction, specifically for widening the span and roadway. What is new is that in order to form additional cantilever parts, at least one through channel and blind holes in the head part and body of the existing supports are drilled in the head part of each existing support relative to its longitudinal axis, then hollow channel formers are fixed in the through channels coaxially with them on one or both sides of each support, the protruding part of which is made with a length corresponding to the length of the additional cantilever parts being formed, after which the ends of the reinforcement bars are sealed in all the blind holes, the reinforcement bars are then tied together by additional reinforcement bars into a single frame of additional cantilever parts, after which an anchor device is mounted to the hollow channel former and the additional cantilever parts are formed by concreting the created frame with hollow channel formers in the formwork and after the appropriate curing of the concrete, high-strength reinforcement is introduced into the channel formers through the anchor devices, then it is tensioned with subsequent injection of the through channel with a hardening material. The technical result of the invention consists in reducing labor costs and material consumption, as well as reducing the time required to carry out work without interrupting traffic during the reconstruction period, while simultaneously ensuring the reliability of the operation of both the widened support structure and the bridge structure as a whole. The disadvantage of this invention is the complex design and time required to complete the work on widening the bridge structure, and the invention is also made without insulation of the cantilever part, which reduces its performance qualities. The Russian Federation patent for invention No. 2046879 “DESIGN FOR WIDENING A SPAN STRUCTURE” is known. In the span widening design, the beam reinforcement elements are designed as at least a pair of ribs, symmetrically positioned relative to the span's longitudinal axis on the cantilevered overhangs of the capping slab or joined at the top by an additional slab within the main span. When placing ribs on the cantilevered overhangs, each rib can have a U-shaped cross-section. The rib can be aligned with the roadway barrier or guardrail. The capping slab can be rigidly attached to the existing span or freely supported by a flexible layer. The disadvantage of this invention is the complex design and time required to complete the work on widening the bridge structure, and the invention is also made without insulation of the cantilever part, which reduces its performance qualities. The objective of the proposed invention is to create a simplified method for widening a bridge structure using permanent formwork with improved thermal insulation characteristics. The technical result of the claimed invention is: • Creation of a permanent formwork device with thermal insulation characteristics, due to the use of foam glass crushed stone mats in the device, which in turn is economical and safe for the environment. • Creation of a simplified method of widening a bridge by using permanent formwork, which reduces construction time and does not require dismantling and stripping. The technical result is achieved by using permanent formwork for the bridge structure consisting of U-shaped beams, fixed in pairs across the superstructure beams on both sides, projecting beyond the superstructure to form a cantilever. Each pair is connected by means of overlay anchor devices and a crossbar, forming a rigid structure. The overlay anchor devices consist of two U-shaped channels, welded together to form an I-beam, and angles welded to the outer side of the I-beam from the inside. Two openings are made in the central part of the overlay anchor devices for the passage of cables. The cables are located along the entire structure from the inside, and are secured on the outside by anchor devices. The lower part of the cantilever contains slabs of foam glass aggregate in a basalt composite mesh. First, pairs of U-shaped beams are secured to the superstructure on both sides with brackets. They are then connected at the protruding cantilever sections by installing overhead anchors and crossbars welded transversely to the U-shaped beams. The overhead anchors are made by welding two U-shaped channels along the longer side to form an I-beam, and angles are welded to the outside of the I-beam from the inside. Next, cables are pulled across the entire superstructure along each pair of U-shaped beams from the inside of each pair through