Space-planning solutions

From the conditions of the current urban planning situation, it became necessary to arrange a pedestrian crossing outside the level of the carriageway in order to separate the flows of pedestrians and vehicles. Considering that the construction of an underground pedestrian crossing is a rather expensive construction and the saturation of underground communications in this section, the most appropriate is the construction of an elevated pedestrian crossing. A big advantage of an elevated pedestrian crossing is the possibility of construction without stopping the movement of vehicles along an important city highway. The design solution involves the construction of an open pedestrian crossing with stairways and lifts to provide access for people with limited mobility. In terms of the pedestrian crossing has a Z-shape. The main bridge span across the avenue is an arch system based on two pillars located on the sidewalks of opposite sides of the avenue. The two secondary spans across the avenue are a beam system. The pedestrian crossing is provided with an organized rainwater drainage system. Ladder descents are also a monolithic system based on a span system and a support platform at ground level. An intermediate support is arranged in the middle of the stairway. Throughout the stairway, platforms have been arranged that provide a comfortable ascent for pedestrians. The pedestrian crossing and stairways are provided with a 1200 mm high fence. The railing consists of vertical posts and a horizontal handrail. It is planned to install 4 lifts and install additional handrails in the stairway fencing for people with limited mobility.

Brief description of the structures of the elevated pedestrian crossing

Based on the parameters of traffic flows at the intersection of the avenue and the avenue in the area of ​​the metro station, the main direction of pedestrian movement was identified, along which the main span is located. It runs diagonally across the intersection from the metro station. Side spans cross the avenue on both sides of the avenue. As a result, you can get to any side of the intersection through this elevated pedestrian crossing. The main span of the pedestrian overpass (through the avenue) is an arch span with a rigid arch and a flexible tie. The estimated span along the arch support axes is 69,1 m. The vault of the arch is made of a metal pipe 1120*16 mm with a lifting boom of 12,5 m; The walkway is made of prefabricated monolithic reinforced concrete of B820 concrete. The thickness of the slab in the span between the transverse beams is 100 mm, above the transverse beams - 200 mm, where the monolithic joint between the prefabricated slabs is carried out. In the supporting sections of the arched span, where the walkway passes into the side spans, the thickness of the slab is 200 mm both above the transverse beams and in the span between them. The slab itself in this area is monolithic. The passable part is oriented diagonally in relation to the arch in such a way that at the beginning of the span the passable part is to the left of the arch, in the middle of the span - along the axis with the plane of the arch, at the end of the span - to the right of the arch. Structurally, this location of the walkway is made by means of transverse beams, which are welded to the arch puff at a certain angle and with a variable long console. The transverse beams are oriented strictly perpendicular to the slab of the walkway and are located in increments of approximately 2,091 m. T-section transverse beams, wall height at the root of the console 800 mm, thickness 16 mm, wall height at the edge of the console 100 mm, in the place of the cable-stayed node 300 mm. Belt with a section of 400x20 mm, for the possibility of designing a joint of monolithic reinforced concrete slabs of the walkway. The pavement of the walkway of the pedestrian crossing is made of a layer of screed with a heating cable, 40 mm thick, on top of which a rigid-elastic highly filled coating of the Sika type is arranged, which is highly resistant to mechanical stress, and also performs the function of waterproofing the heating layer and the slab of the walkway. Flexible tightening with a prefabricated-monolithic reinforced concrete slab is supported by the arch arch by means of hangers with a step of 6,274 m. Rope hangers of closed design, rated load not less than 470 kN. Support is provided only on one side of the walkway - up to the middle of the bridge, the suspension plane is located on the right relative to the walkway, in the rest of it - on the left, as well as the location of the arch. Suspension attachment points are located on each third of the transverse tightening beam outside the prefabricated-monolithic slab of the walkway. The arched superstructure is supported by means of a support diaphragm, which is cantilevered towards the slab of the walkway. On each support there are two spherical support parts of the Maurer Sohne type - the first 200 tons directly along the axis of the arch, the second 100 tons at a distance of 2 m, which ensures the stability of the arch in space from overturning. The vault of the arch and the puff are welded to the wall of the support diaphragm in one unit. The supporting diaphragm is an I-beam 1200 mm high, wall thickness 20 mm and belts 500x25 mm. Beam spans (through the avenue) are similar in design to the puffing design of an arch span in terms of a monolithic reinforced concrete slab and metal beam structures. The transverse beams have the same sections as on the arched superstructure, but are oriented centrally with respect to the beam (pipe 820x16 mm). At the ends, these superstructures have supporting diaphragms of the same sections as on the arched superstructure. The support is carried out through 2 spherical support parts 100t Maurer Sohne type at each end of the superstructure at a distance of 1 m from the axis of the beam. The span structure on the side of the station has design spans of 21,9 m + 19,6 m, on the opposite side 21,3 m + 21,6 m. The supports at the junction of the arch and beam spans are made of massive monolithic hollow concrete B520. Also, these supports are adjoined by a ladder descent, monolithic with the body of the support, and a lifting device located on the grillage of this support. The support is a spatial structure with 4 walls with a slab concreted on top, 200 mm thick. The main load-bearing walls are located: the first is under the supporting diaphragm of the arch span, the second is at a distance of 1650 mm in the light parallel to the first. The thickness of the bearing walls is 500 mm. On the other two sides of the wall 200 mm thick. A technical room with an area of ​​4,4 m2 is organized inside the support. Between the bearing walls under the supporting diaphragm of the beam span, a crossbar is organized, 500 mm thick to support the beam span. There is a 1 m wide opening in the wall under the crossbar for access to the technical room. On the opposite side of the support, in continuation of the beam span, on the slab of the grillage, the structure of the lifting device shaft is located. The base of the support is made on 4 piles with a diameter of 520 mm and a length of 19 m. The grillage has dimensions in terms of 3150x5165 mm and a height of 1500 mm. The stairway in this place consists of three marches. The first two flights of stairs are monolithic with a support body, which is a monolithic reinforced concrete wall with a section of 5480x600 mm. The marches are cantilevered on opposite sides of the support along its larger edge and are united at the end of the support by a monolithic reinforced concrete platform located on a crossbar with a cross section of 600x500 mm. The third flight of stairs is made monolithic with a support of stairs and a massive support of superstructures, in places of platforms it has reinforcements in the form of crossbars with a section of 700x500 mm. The base of the staircase support is made on two piles with a diameter of 520 mm and a length of 19 m. The grillage of the support is made of monolithic B30 concrete and has dimensions of 5980x1100 mm in plan and a height of 1000 mm. The bodies of the intermediate supports of the side spans have a flange support at the bottom on a monolithic grillage made of VZO concrete. The base of this support is piled and has one pile with a diameter of 520 mm and a length of 19 m. A reinforced concrete grillage is concreted on top with overall dimensions in terms of 1020x1020 mm, height 1 m. The body of the support is monolithic, made of B35 concrete, of variable section, with a grillage of rectangular section 820x1500 mm, on top of a T-shaped section with a monolithic reinforced concrete slab on top, 200 mm thick. The slab is made monolithic and goes into a flight of stairs. Monolithic flights of stairs made of B35 concrete. Support is carried out in places of horizontal platforms on round monolithic reinforced concrete supports with a diameter of 500 mm. The support posts are made of B35 concrete and pass below into a pile with a diameter of 520 mm, a length of 19 m, made of B25 concrete. All monolithic structures of flights of stairs, supports of flights of stairs and monolithic supports are made of B35 concrete. The pile foundations of all supports are made according to the Fundex technology - a driven pile with a left metal tip, the material of the piles is B25 concrete. The metal structures of the superstructures, as well as the bodies of the intermediate supports of the beam superstructures, are made of metal 09G2S. Expansion seam waterproof with a rubber compensator. Water drainage is carried out along the walkway due to the longitudinal slope to the ends of the span, where a plastic drainage tray is located.