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 such 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 plan view, the pedestrian crossing has a horseshoe shape. The bridge span is a beam system supported by three pillars. The central support is located on the dividing strip of the carriageway. The other two supports are located on the sidewalks of opposite sides of the street. The pedestrian crossing is provided with an organized rainwater drainage system. Ladder descents are also a beam system based on a span system and a support platform at ground level. An intermediate support is arranged in the middle of the stairway. The steps of the stairs are equipped with ramps for the possibility of lifting prams. Throughout the stairway, platforms have been arranged that provide a comfortable ascent for pedestrians. The pedestrian crossing and stairways are provided with a 1100 mm high fence. The railing consists of vertical posts and a horizontal handrail. Also, the fence is provided with additional handrails for people with limited mobility. 

GENERAL CHARACTERISTICS OF THE PEDESTRIAN CROSSING

In accordance with the approved planning decisions, the design documentation provides for the construction of a pedestrian crossing. As a recommended option for an overhead crossing, the design of an open two-span pedestrian crossing with a span length in the axes lp = 20,2 m was adopted. The vertical clearance above the carriageway is assumed to be at least 5.5 m. under the transition. The minimum width of the passage for pedestrians on the superstructure is 3,0 m, the width of the passage on the stairways is taken from 3,5 m at the junction with the superstructure to 4,2 m at ground level.

MEASURES THAT PROVIDE ACCESSIBILITY OF THE PEDESTRIAN CROSSING BY LOW-MOBILE POPULATION GROUPS.

The project provides for the following activities:

• The main measure is the installation of two vertical lifts, which ensure the lifting of the MMGN from the ground level to the level of the top of the superstructure of the designed pedestrian. This event fully provides access for MMGN. Section II Design of the ROW
• An additional measure is the arrangement of steps on stairways with a height of 120 mm and a width of 400 mm. A platform 1500 mm wide is arranged every six steps.
• Additional handrails at the height of 900 mm and 700 mm are installed on the stairway railing.
• Borders with a height of 100 mm are provided on the stairways and on the span along the edges.
• At the steps of stairways, ramps are arranged for the possibility of lifting wheelchairs.

GENERAL CHARACTERISTICS OF THE PEDESTRIAN CROSSING

In accordance with the approved planning decisions, the design documentation provides for the construction of a pedestrian crossing. As a recommended option for an overhead crossing, the design of an open two-span pedestrian crossing with a span length in the axes lp = 20,2 m was adopted. The vertical clearance above the carriageway is assumed to be at least 5.5 m. under the transition. The minimum width of the passage for pedestrians on the superstructure is 3,0 m, the width of the passage on the stairways is taken from 3,5 m at the junction with the superstructure to 4,2 m at ground level. To meet the needs of people with limited mobility, the project provides for the installation of four lifting devices in glazed shafts. Platforms provide lifting to a height of up to 7 meters (lifting platform BK A-111 manufactured by LK "Afonskaya" or equivalent).

Bearing structures of the transition. Supports

At the pedestrian crossing, it is planned to install reinforced concrete supports of three types of individual design:

• three single-column supports for spans with a variable width of the bearing racks, the section of the pillars of the supports OP1, OP3 on the bottom is 1,6x1,2 m, on top 1,6x1,6 m, the section of the rack OP2 on the bottom is 1,0x1,2 m, on top 1,0, 1,6xXNUMX m;
• single-column supports of stair descents with the size of the racks on the bottom 1,0x1,2 m, on top 1,0x1,4 m;
• massive wall supports for the end sections of ramps and stairways on a natural base.
Grillages of rack supports on the basis of bored pillars with a diameter of 1,0 m. The maximum load on the pile is 1023 kPa, the bearing capacity of the pile on the ground is 1180 kPa. Massive supports of staircases on shallow foundations, the design pressure on the base of the foundation is 86 kPa, the bearing capacity of the foundation soil, taking into account the replacement of fluid-plastic loam to a depth of 1 m with a layer-by-layer compacted gravel-sand mixture, is 186 kPa. The support body material is concrete of B25 compressive strength class, F300 frost resistance grade and W8 water resistance grade. The material of the grillage and bored piles is concrete of B25 compressive strength class, F200 frost resistance grade and W6 water resistance grade.

Design of spans and stairways

The span structure of the pedestrian bridge is individual, metal, continuous, the span scheme is 2x20,2m. The main beam of the superstructure is box-shaped with inclined walls. The vertical height of the main beam wall is 900mm, the width of the lower and upper chords is 3200mm and 1400mm. The wall thickness of the main beam is 12mm, the thickness of the lower chord is variable - in the support zones - 32mm, in the span - 20mm, the thickness of the upper chord - 14mm. Longitudinal and transverse strip stiffeners are welded onto the inner surfaces of the walls and chords of the main beam. In the support sections inside the boxes of the main beams, solid-walled diaphragms reinforced with stiffeners are welded along the support axis. Mounting joints of the main beam of superstructures are welded. The span material is low-alloy steel for bridge construction grades 15KhSND and 15KhSND-2. Metal structures are protected from corrosion by the Steelpaint coating system. The bridge deck on the walkway of the span consists of a single-layer asphalt pavement laid over the Technoelast-most-C waterproofing layer. The design cross slope of the walkway of 2% towards the drainage devices is achieved due to the variable thickness of the asphalt pavement. The railing of the walkway is metal with a height of 1.1m. Water is drained from a trough formed by a transverse slope into drainage pipes with an internal diameter of 60 mm (pipe installation step is 3 m), followed by discharge into a longitudinal drainage tray under the span, and further along the extreme supports into the storm sewer. The installation of the span structure of the pedestrian bridge is carried out on temporary supports. Stair descents of the pedestrian bridge are made of monolithic reinforced concrete, continuous according to an individual project. The clear width of the stairways between the railings is variable - at the top it is 3,9m, at the bottom it is 4.3m. The material of stair descents is structural heavy concrete of strength class B30, grades F300, W12 according to GOST 26633-91. Protection of open surfaces of stair descents is carried out by the Steelpaint coating system. Pedestrian bridge stairways are concreted on temporary supports. The shafts of the lifting devices of the pedestrian bridge are metal (frame type) with glazing, the height of the structures is ~ 10 m, in the section of the shaft - a round shape with a radius of 1.3 m. The foundation of the shafts of lifting devices is made of monolithic concrete. Design solutions for the recommended option are presented in the drawings of the kit 01.0063-02-KR

The composition of the project

Volume 1.1 0061-PZ Part 1. General explanatory note. Initial data.
Volume 1.2 0061-PZ.IGD Part 2. Report on engineering and geodetic surveys.
Volume 1.3 0061-PZ.IGL Part 3. Report on engineering and geological surveys.
Volume 1.4 0061-PZ.IE Part 4. Report on engineering and environmental surveys.
Section II Right-of-way design
Volume 2.1 0061-PPO. FDI Part 1. Property and legal inventory report.
Volume 2.2 0061-PPO.OIZ Part 2. Justification for the withdrawal and provision of land
Section III Technological and design solutions for a linear facility. Artificial constructions.
Volume 3.1 0061-TKR Part 1. Structural solutions
Volume 3.2 0061-TKR.AR Part 2. Architectural solutions
Volume 3.3 0061-TKR.SVP Part 3. Territory preparation. Master plan of networks
Volume 3.4 0061-TKR.EP Part 4. Electric heating of a pedestrian crossing
Volume 3.5 0061-TKR.NVK Part 5. Reconstruction of water supply and sewerage
Volume 3.6 0061-TKR.SS Part 6. External communication networks
Volume 3.7.1 0061-TKR.EO Part 7.
Book 1. Reorganization of outdoor lighting and contact network
Volume 3.7.2 0061-TKR.EO Part 7.
Book 2. Lighting, power supply
Volume 3.8 0061-TKR.OZ Part 8. Landscaping and gardening
Volume 3.9 0061-TKR.TSODD Part 9. Technical means of organizing traffic
Section V Construction Organization Project
Volume 5.1 0061-POS Part 1. Construction organization project. SVSU
Volume 5.2 0061-POS.OD Part 2. Organization of traffic for the period of construction
Section VII Environmental Protection Measures
Volume 7.1 0061-OOS Part 1. Measures for environmental protection
Volume 7.2 0061-OOS.TR Part 2. Technological regulations for handling construction waste at the facility
Section VIII Measures to ensure fire safety
Volume 8 0061-MPB Measures to ensure fire safety
Section IX Construction estimate
Volume 9 0061-CM Estimate for the construction of an elevated pedestrian crossing