RU2689009C1 - Method of reconstruction of the bridge span structure with metallic double-cantilever arch - Google Patents

Abstract

FIELD: construction.SUBSTANCE: invention relates to bridge-building, particularly, to reconstruction and reinforcement of existing bridge span. Method of bridge span reconstruction with metal double-cantilever arch consists in installation of steel sheet in lower part of end support transverse beam. Then cavity of the end support transverse beam is concreted with fiber concrete. Forming of formwork in lower part at end sections of main beam, then concreting end sections of main beam fiber concrete. After that holes are arranged in metal diaphragms and holes are drilled in concreted end sections of main beams. Then, bundles of ropes are pulled through end sections and main beam diaphragms. After that stepwise pre-stressing of main beam is performed by means of tension of bundles of ropes, clips are fixed and anchors with three-petal clamp are fixed. It is then filled with an injected solution. Then bottom bottom formwork is installed along main beams length. After that, there are installed the pout-formers, and then the main beam compartments are concreted with fiber-concrete.EFFECT: reinforcing damaged cross links of metal double-cantilever arch by increasing cross-section with metal sheets by means of welding.1 cl, 7 dwg

Description

The invention relates to the field of bridge construction, and in particular to a method for the reconstruction and strengthening of the existing bridge span.

Known patent for the invention of the Russian Federation No. 2640855 MPK E01D 22/00 "METHOD OF STRENGTHENING THE BRIDGE STRING". The invention relates to the field of bridge construction, and in particular to a method for the reconstruction and strengthening of the existing bridge span. A method of strengthening the bridge span includes drilling at least two holes in the diaphragms of adjacent beams of the span along the entire reinforced section; installation of tufts of strands in the holes drilled in the diaphragms; tension and fastening of the strand bundles by anchor elements at the extreme diaphragms; drilling in the upper plates at the joints of adjacent beams, in the area of voids between the orifices of the holes, the number of which depends on the number of voids between the diaphragms; construction of formwork under the apertures of adjacent beams; filling the voids between the diaphragms with concrete through the holes in the upper plates of adjacent beams and dismantling the formwork after the concrete has set.

The disadvantages of this invention is the excessive weighting of the construction of the superstructure of the bridge.

Known patent for the invention of the Russian Federation No. 2476637 IPC E01D 22/00 "STRUCTURE STRENGTHENING NADOPORNOUS PLOT AROCHNY BRANCH STRUCTURE OF THE BRIDGE". The invention relates to a bridge and can be used in the construction of the reinforcement of the support section of an arched superstructure. The reinforcement structure of the nadoporny section of the arched span includes arches supported by their ends on permanent supports of the bridge, support legs, a beam cell consisting of longitudinal and transverse beams and longitudinal beams of inter-span filling, supported by longitudinal beams, and a roadway with expansion joints. Below the transverse beam in the span adjacent to the nadoporny section, a flat reinforcement truss mounted to the support posts is mounted, between the extreme transverse beam in the span adjacent the nadoporny section and the reinforcement planar farm, additional longitudinal beams are placed, supported on the planar reinforcement truss and suspended to the transverse beam located in the middle of the span. On additional longitudinal beams, additional transverse reinforcement beams are installed, on which, through the tangential bearing parts of increased displacements, the ends of the longitudinal beams of inter-span filling are supported and the ends of the existing longitudinal beams adjoining the superstructure of the superstructure through the wedged steel sheet packages. The flat girder truss has a bearing capacity not lower than the bearing capacity of the extreme one in the span of the transverse beam adjacent to the overhead section. The bearing capacity of the arch span of the bridge is increased.

The disadvantages of this invention is the construction of a large number of additional supporting elements.

The task of the invention is the creation of a simple low-cost method for the reconstruction of the span of the bridge with a metal dual console arch, which provides the ability to increase the load, thereby increasing the reliability of the existing span of the bridge.

The problem is solved due to the fact that the method of reconstruction of the span of the bridge with a metal double console arch is that the steel sheet is installed in the lower part of the end supporting transverse beam. After that, the cavity of the end supporting crossbeam is concreted with fibrous concrete. Install the formwork in the lower part on the end sections of the main beam, then concrete the end sections of the main beam with fiber-reinforced concrete. Then arrange holes in the metal diaphragms and drill holes in the concrete ends of the main beams. Then pull the bundles of ropes through the ends and the diaphragm of the main beam. After that, a stepwise prestressing of the main beam is performed by means of tensioning the rope bundles, the clamps are fastened and the anchor is secured with a three-lobe clamp. Then fill in the injected solution. Next, install the bottom formwork along the entire length of the main beams. After that, the hollow cores are installed, and then the sections of the main beam are concreted with fibrous concrete. Strengthen the damaged cross-links of the metal double-console arch by increasing the cross-section of metal sheets by welding.

The essence of the claimed invention is illustrated by drawings where:

FIG. 1 - General view of the bridge span with a metal double console arch

FIG. 2 - View of the bridge span with a metal double-console arch in cross section.

FIG. 3 - Top view of the bridge span with a metal dual console arch

FIG. 4 - View of the end transverse beam in cross section.

FIG. 5 - Cross-section in the end part of the longitudinal main beam of the bridge with a metal double console arch with installed bundles of strands.

FIG. 6 - Cross-section of the longitudinal main beam of the bridge with a double-console metal arch with installed hollow cores.

FIG. 7 - View of a metal double console arch in cross section.

Bridges with a metal double console arch are important infrastructure facilities of small cities of Russia, through which a large number of both urban and transit transport moves daily. Engineering structures built in the middle of the last century and designed for the load, which today, taking into account the transport situation, has already been exceeded. Over the years of operation of the bridges, their construction, including the bridge deck, sidewalk walkways, supporting structures, have come to an unsatisfactory condition.

Metal structures under the slabs of the carriageway are subject to a deep degree of corrosion. A large number of elements have a layered corrosion. Some elements are disturbed to the extent of loss of the section of the element and are in an emergency condition. Some rivets have lost their bearing capacity due to corrosion processes and must be replaced.

The main type of defects in reinforced concrete spans are cracks in concrete. The presence of cracks of an unacceptable opening can lead to intensive corrosion of the reinforcement and a decrease in the bearing capacity of the structure. Particularly dangerous corrosion prestressed wire fittings. Therefore, when maintaining reinforced concrete bridges, special attention is paid to maintaining the waterproofing, drainage system and preventing the occurrence and development of cracks, primarily those that can reduce the bearing capacity of the structure. Such cracks primarily include inclined cracks in the walls and longitudinal cracks in the zone of junction of the roadway plate to the walls of the beams.

The proposed method for the reconstruction of the bridge span with a metal dual console arch has been developed for bridge structures with metal beams with diaphragms.

The essence of the claimed invention is that:

Pre-set the steel sheet 3 in the lower part of the end support transverse beam 5, after which the cavity 6 between the diaphragms of the end support transverse beam 4 is concreted with fibrous concrete to create a more durable construction (see Figs. 1, 3, 4).

After that, formwork 7 is installed in the lower part of the end sections 10 of the main beam 8, then the end sections 9 of the main beam 8 are filled with fibrous concrete. Then arrange the holes in the metal diaphragms 12 and drill the corresponding holes in the concrete ends of the main beams 13 so that tunnels are formed for pulling the bundles of ropes 14. Next, metal plates are installed on top of the ends 9 of the main beams 8. Then in the end sections 9 and the diaphragms 11 of the main beam 8 through the holes 12, 13 pull bundles of ropes 14 along the entire reinforced section of the span of bridge 1. After pulling bundles of ropes 14 perform a phased prestressing of both main beams 8 by tensioning the bundles of rope 14. Next, fix the yoke 15 and secure the anchor with a three-lobe clamp 16 (see Fig. 1, 3, 5). Then the remaining voids in the arranged holes 12, 13 with bundles of rope 14 are filled with an injected solution for non-mechanical fixation. After that, formwork of the bottom bottom 18 is installed along the entire remaining length of the main beams 8. After that, to facilitate the construction, the emptying masks 19 are installed in the cavities arranged inside the main beam 8, and then the main beam 8 is completely filled from inside with fiber-reinforced concrete (see Fig. 1, 2, 3 6). Thus, the weight of the span of bridge 1 with a metal dual console arch 2 can be significantly reduced. After that, arrange a polyurethane waterproofing along the entire length in the upper part of the main beam 8.

After that, the damaged cross-links of the metal double-console arch are strengthened by increasing the cross-section with metal sheets by welding (see Figs. 1, 2, 7).

Industrial applicability is that the proposed method is quite simple and does not require large material costs and additional equipment. Since the drilling of holes, the construction of the formwork and the filling of the holes with concrete can be made by several working tools available during the construction and repair of any construction object.

All the above indicates the solution of the task, namely: the creation of a simple, low-cost method for the reconstruction of the bridge span with a metal double console arch, which provides the possibility of increasing the load, thereby increasing the reliability of the existing bridge span.

List of positions

1. bridge span

2. metal dual console arch

3. steel sheet

4. end support transverse beam

5. the lower part of the end support transverse beams

6. cavity end support transverse beams

7. formwork

8. main beam

9. end sections

10. the lower part of the end sections

11. metal diaphragm

12. holes in metal diaphragms

13. holes in the concrete ends of the main beams

14. bundles of ropes

15. clips

16. anchor with three-lobe clamp,

17. the bottom of the main beams

18. floor formwork

19. waste formers

20. compartments of the main beam

21. cross connections of a metal two-console arch

22. cross section of a metal double console arch

23. metal sheets

Claims (1)

The method of reconstruction of the bridge span with a metal double console arch is that the steel sheet is installed in the lower part of the end supporting crossbeam, after which the cavity of the end supporting crossbeam is concrete-cast with fiber-reinforced concrete; install the formwork in the lower part at the end sections of the main beam, then concrete the end sections of the main beam with fiber-reinforced concrete, then arrange holes in the metal diaphragms and drill holes in the concrete end sections of the main beams, then draw ropes bundles through the end sections and diaphragms of the main beam, then perform stepwise prestressing of the main beam by means of tensioning the rope bundles, fixing the sleeves and fastening the anchor with a three-lobe clamp, then filling and etsirovannym solution further adjusted lower bottom formwork for the entire length of the main beams, after which the set blockouts, then concreted sections of fiber concrete main beam; strengthen the damaged cross-links of the metal double-cantilevered arch by increasing the cross-section of metal sheets by welding.

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