Constructive decisions

The length of the repaired section (artificial structure with approaches) - 155,2 m; the length of the artificial structure (bridge) is 19,88 m. The overhaul involves the dismantling of the existing bridge structures and approaches with their subsequent restoration in accordance with modern requirements. Accepted load in the calculation of pavement structures of the roadway - A10, artificial structures - A14H14. The width of the existing carriageway is 6,0 m, the width of the shoulders (on each side) is 1,5 m. The radii of the curves in the plan are 15 and 50 m. The cross profile of the street in the section under consideration is gable. Restoration of approaches, sidewalks and lawns is envisaged in accordance with the existing horizontal layout, with the installation of sidewalks with curbstones and VOC service areas. The width of the roadway on the repaired bridge is 8,0 m. The radii of the concave curves, taking into account the elevation of the roadway on the bridge up to 13,22-13,37 m, are taken as 500 m, the maximum longitudinal slope is 16,5‰. The transverse slope along the carriageway is 20‰, along the sidewalks 15‰. Side stones separating the carriageway from sidewalks - concrete BR100.30.18, in lawns - concrete BR 100.20.8, at pedestrian crossings - granite GPV (baring height 4,0 cm). Surface drainage is provided in the designed storm water wells located in the tray of the carriageway. In order to avoid waterlogging of the subgrade, drainage is arranged from corrugated pipes with perforation d = 110 in the filter, at a distance of 0,4 m from the side stone. Pavement designs are adopted in accordance with the calculations according to ODN 218.046-01 and in accordance with the standard ones. 1. Designs of carriageways: hot dense fine-grained asphalt concrete type A, grade I, GOST 9128-2009, - 5,0 cm; hot porous coarse-grained asphalt concrete, grade I, GOST 9128-2009, - 10,0 cm; crushed granite grade 1000, fraction 40-70, with cleats, GOST 8267-93, 25607-2009 - 26,0 cm; fine sand (content of silt-clay fraction 5%), Kf≥3 m/day, GOST 8736-93*, – 70,0 cm; 2. Pavement structures with asphalt concrete pavement: asphalt concrete hot sandy dense type G grade II, GOST 9128-2009 - 4,0 cm; crushed granite grade 1000, fraction 40-70, with cleats, GOST 8267-93, 25607-2009 - 15,0 cm; fine sand (content of silt-clay fraction 5%), GOST 8736-93* - 30,0 cm; At the intersections with existing road structures, it is planned to lay the geogrid “Ha Telit” C 40/17 between the layers of asphalt concrete pavement. The existing bridge - a single-span girder 14.0 m long, made of rolled steel beams with a reinforced concrete slab, on metal piled single-row supports - was built approximately in the 50s. 20th century, in 1970-1975 was reconstructed. It is currently in an unsatisfactory condition. During the development of the project for the overhaul of the bridge, the dimension of the bridge was G-8 with two sidewalks of 1,5 m each. The overhaul includes the replacement of the span structure, including the bridge deck, the reconstruction of supports and junctions of the bridge with approaches. Loads A14, NK100. During the overhaul of the bridge, vehicular traffic will be carried out on a temporary bypass road downstream. For the new bridge, it is planned to use a prefabricated reinforced concrete girder span 15,0 m long according to a standard design Inventory No. 54124-M, designed for loads A14 and NK100. The bridge deck consists of Dorflex waterproofing, a protective layer of poured asphalt concrete, and a coating of ShchMA-15. Enclosing structures are adopted in the form of prefabricated reinforced concrete parapets of the Starkom type. Supports 1 and 2 are made of piles, single-row of driven reinforced concrete piles with a section of 40x40 cm, immersed using leader holes with a diameter of 350 mm. The piles are united by a reinforced concrete grillage-nozzle, on which the cabinet wall is concreted. Supporting parts - rubber, expansion joints - type "Brake-Joint". The interface of the bridge with the approach embankments is made using reinforced concrete adapter slabs. Measures against erosion of the channel and undermining of the fortification consist in the installation of a geogrid filled with crushed stone in a section along the river channel at a distance of 5 m above and below the bridge on both sides of the river and a blind area of ​​the river channel with rock fill under the bridge and at a distance of 5 m above and below flow. The temporary bypass road uses a culvert to cross the river. The foundation for the treatment plant (WTP) is designed as a monolithic reinforced concrete slab 300 mm thick. The depth of the slab is 1,87 m, the material is B25, F150, W4 class concrete, ASh class reinforcement. Under the slab, concrete preparation is provided from concrete of class B7,5 with a thickness of 100 mm on a sand cushion of medium-grained sand with layer-by-layer compaction. The ascent has been calculated.

Engineering equipment, utility networks, engineering activities

The design documentation for the re-laying of the gas pipeline was made in accordance with the decisions on the overhaul of the facility and in accordance with the technical specifications. Within the boundaries of road works there is a section of a low-pressure distribution gas pipeline made of a polyethylene pipe Dn225 mm. The project documentation provides for the re-laying of the gas pipeline section with the removal of the designed roadbed from the slope within the boundaries of the overhaul of the facility. The length of the section is ~60,0 m. The gas pipeline is designed underground with the preservation of the diameter and material of the pipe. Polyethylene pipes according to GOST R 50838 were used for the gas pipeline. The laying method is open. The construction of the trench for the gas pipeline was made taking into account the data of engineering and geological surveys with the arrangement of the base and sand backfill. To indicate the places of laying gas pipelines, the following are used: signal tape indicators of the location of underground utilities. The planned and altitude position of the gas pipeline is linked to the adjacent sections and other engineering communications within the boundaries of the work. In connection with the overhaul of the bridge, the project documentation provides for the dismantling of 4 existing supports and the installation of 4 new supports and their connection according to the existing scheme without increasing power. The luminaires are of the ZhKU-250 type, the power supply is designed from the existing KUO-031 (TP031). The length of the reconstructed section is 200 m. The design documentation provides for the protection of existing communication networks that fall into the area of ​​work on the repair of the bridge, with reinforced concrete slabs 2,99 * 3,38 * 0,2 - 11 pcs. and 2,99 * 0,78 * 0,07 - 5 pcs. The project documentation provides for the removal of surface runoff. In connection with the location of the approaches of the bridge in the water protection zone of the river. PK 0+33,96 provides for the installation of treatment facilities. Treatment facilities of the company Flotenk with a capacity of 3 l / s are provided, consisting of: a sand separator, an oil separator, a sorption filter. The concentrations of pollutants in the rain runoff before treatment are: according to wt - 3000 mg / l, according to n / a - 20 mg / l, after cleaning - according to vv - 3.0 mg / l, according to n / a - 0.05 mg/l. The construction of the trench for the rainwater sewer network was made taking into account the data of engineering and geological surveys with the construction of the base and sand backfill, as well as taking into account measures to ensure the safety of existing communications.