SU1416593A1 - Method of reinforcing and expanding ferroconcrete-steel bridge span structure - Google Patents

Abstract

The invention relates to bridge construction, and can be used in the reconstruction of typical beam concrete concrete bridge span structures. The aim of the invention is to reduce the material intensity of reinforcement and broadening, increase the bearing capacity of the superstructure without reinforcement of the metal main beams and girders. With reinforcement and broadening, disassembly of the monolithic concrete between the high points and in the windows 8 stops, cutting of reinforcement loops of the stops, disassembly of monolithic concrete of the longitudinal and transverse joints, cutting of connecting strips connecting the plates above the girder 3, cutting the reinforcement of the transverse joints are performed. After this, the existing precast slabs 4 of the reinforced concrete roadway and sidewalk blocks 10 are temporarily dismantled, reinforced stops are fixed on the upper surfaces of the main beams 1 and girders 3, the reinforcement and the formwork are installed. Out of the longitudinal ribs Pi 12 with a height greater than that of the existing ribs, the dismantled plates 4 are set at an elevated level to the same place in plan, arranging a positive ceiling formwork with reinforcement of new transverse ribs 13 under the existing cross seams of the plates 4, and formwork reinforcing cages of the cantilever parts 14 of the existing plates 4 and the new transverse rib 15 - under the consoles of the existing and new sections of the plates, the welding of reinforcement releases is made 4 times with itself, with stops and ribs reinforcement. and the concreting of the longitudinal P and 12, the transverse 13 and 15 ribs and the new cantilever sections of prefabricated plates 4. After the concrete has been set to strength, the production is carried out. dt installation of pavement blocks 10, insulation and pavement device. 5 il. (/ O) ate with bo

Description

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Claims (4)

Claim A method of reinforcing and broadening the steel-reinforced concrete span of the bridge, including increasing the working section height and broadening the consoles, the existing reinforced concrete slab of the carriageway, consisting of prefabricated windows with stops for plates placed on the upper belts of metal main beams and girders, connected to each other in transverse welds releases of reinforcement with cast-in-place concrete and in longitudinal seams above the girders - connecting plates and cast-in-place concrete, and with main beams by welding loop outlets and up. a ditch with monolithic concrete in the slab windows, characterized in that, in order to reduce the material consumption of the reinforcement and broadening, increase the bearing capacity of the span without reinforcing the metal main beams and girders, the monolithic concrete of the windows in the slabs are disassembled before broadening the existing slab main beams and girders, cutting reinforcing · loops and connecting strips, dismantling monolithic concrete and cutting reinforcement of transverse joints, prefabricated plates, their dismantling, installation of reinforced stops, reinforcement and formwork rodolnyh ribs on verhIzobretenie relates to Mostostroy NIJ and can be used in the reconstruction of standard beam of composite bridge spans. The purpose of the invention is to reduce the material consumption of amplification and broadening, increase the bearing capacity of the span without reinforcing the metal main beams and girders. Figure 1 shows the span (before reconstruction), a cross section in the middle of the span; on fig 2 - section aa in figure 1; on Fig. 3 - span after reinforcement and broadening, cross section; in Fig.4 - diagram of the distribution of normal stresses in the section of the span after amplification; Fig. 20 shows the span after reinforcement and broadening, top view. Steel reinforced concrete span before reinforcement and broadening includes two steel main beams 1, 25 link system 2, run based on them 3 and reinforced concrete slab of the carriageway, including prefabricated slabs 4 with low longitudinal ribs 5 and flanges 6, a longitudinal seam 7 of monolithic-30 slabs 4, monolithic concrete windows 8 of the construction of combining slabs 4 'with the main beams 1 by means of stops and reinforcing loops (not shown conditionally), transverse spaced 35 night seams 9 of the articulation and paving blocks 10. Strengthening and broadening of the existing span is carried out in the following sequence. Proe-40 disassemble monolithic concrete between the pipes. Beat the windows with 8 stops, cut reinforcing loops of the stops, disassemble. monolithic concrete of longitudinal 7 and transverse 9 joints, cutting of connecting 45 steel strips uniting, plates 4 above run 3, cutting reinforcement of transverse joints 9. After this, the existing prefabricated plates 4 and sidewalk blocks are temporarily dismantled. upper belts of the main cans 1 and runs 3 fix reinforced stops, install reinforcement and formwork (not shown) new longitudinal ribs 11 and 12 with a height greater than $$ than that of existing ribs 5, install the dismantled existing plates 4 on the mounting tables for fishing . at the same level in the plan of the month of the main beams and girders, the installation of dismantled precast plates on the tables at the same place in the plan, the installation of suspended formwork with reinforcement under the transverse joints of the plates, welding of reinforcing plate outlets with each other, with stops and reinforcement ribs and concreting of longitudinal and transverse ¹ re ⁵ ber. A-A of FIG. 2 it- 4 - \ —- ^f 0 ---------- ^ν - ~ Η ------ PJ - 0 X- ⁴ g-7 ΖΖΖΖΖΖΣΖΖΖΖΖΖΖΖΖΖΖΖ ^ ΖΖΖΖΖΖΖΖΖ2ΖΖΖΖΖ0ΖΖΖ ^ * “- / - / g / / ЧЛГ ’,, α L3—” zzzz2zzzzzfczzzzzzzzitezzz ± zz22zzzzzzzzzz2 ί / ί ί ΖΖΖΖΖΖΖΖ2 ^ ΖΖΖΖΖΖΖΖ2ΖΖΖΖ22Ζ3ίέζΖΖΖΖΖΖΖ / ί Λ / • / Jul --- 7 τ ^ ~ ψυ * .5 1 .. fi fO th B