Flyover under Construction over the Subway Tunnels


MODELING

MONITORING

Finite Element Analysis

Load Testing

Carousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel image


The first urban ring road
on the section from Dzerzhinskiy Ave.
to Tolstoy St. in Minsk

The complexity of the construction of the flyover was located under it and falling into the zone of influence of the construction of the tunnels running of the third line of the Minsk metro.

In order to ensure trouble-free operation of the structures, it was decided to conduct monitoring - continuous monitoring in full-scale conditions for deformations and forces in the main load-bearing building structures of the transport structure (the flyover), tunnels running, ventilation subway connetcion and checking their compliance with the calculated values.

We developed a program for monitoring the stress-strain state of the load-bearing structures of a flyover under construction, tunnels running and the metro ventilation subway connection in the area of influence of the transport structure construction
for continuous monitoring in full-scale conditions of deformations and forces
in the main building structures and checking their compliance with the calculated values ensuring trouble-free operation
of the structures.

Carousel imageCarousel imageCarousel image
Carousel imageCarousel imageCarousel imageCarousel imageCarousel imageCarousel image

Calculation on minimising the impact of the construction of a transport structure on the metro tunnels

The development of the design model was carried out on the basis of design drawings, the results of engineering and geological surveys and taking into account the technology of work on the construction of a transport structure.

Based on the analysis and generalisation
of the research materials and the calculation to minimise the impact of the transport structure on the metro tunnels,
a comprehensive assessment was carried out and recommendations were made
on the need for monitoring with scientific support for design and construction,
as well as on conducting full-scale tests
after the completion of construction
and installation work.


The point cloud, received resulting from 3D scanning, has been loaded into the developed spatial data model of the monitored objects.

The three-dimensional model and the point cloud were united due to coordinate snapping and altitude for sight control of the actual position of constructions on the construction site to the design position.

Carousel imageCarousel imageCarousel image
Carousel imageCarousel imageCarousel imageCarousel imageCarousel image

Monitoring of VAT structures
in the process of
construction of the overpass and underground tunnels

Continuous monitoring of the stress-strain state of the structures of the flyover and the tunnels running was carried out with the help of automated monitoring system SciBim.

SciBim SVW string overhead strain gauges and SciBim BIV two-axis inclinometers were installed to measure deformations in the load-bearing structures of the tunnels running.

Readings from strain gauges and two-axis inclinometers are interrogated by recorders installed in metro tunnels. The SciBim DL recorder is part of the SciBim Automated construction activity monitoring system , which allows you to query the readings of measuring equipment in offline and real-time mode and transmit them to a remote server.

In order to monitor the stress-strain state of the structures of the tunnels running and the flyover (in the piles, posts and grillages of the supports, as well as in the factory conditions when manufacturing the beams of the superstructures), were installed:

- 102 overhead SciBim SVW;

- 69 embedded SciBim EVW;

- 18 two-axis SciBim BIV inclinometers;

- 4 SciBim DL recorders.


Application of
RFID-technology

To solve the issue of electronic marking of structural elements, the authors, together with SciBim LLC, developed an object management and maintenance system based on RFID technology.

Carousel imageCarousel image
Carousel imageCarousel image


Full-scale tests of
flyover structures

The work program provided for loading the roadway of the flyover in several stages with concentrated temporary test loads.

During the tests, the following parameters are measured:

- stresses (relative strains) in the lower and upper fibers of the reinforced concrete beams of the superstructure in the most loaded sections;
- stresses (relative strains) in the lower fibers of the reinforced concrete slab of the roadway above the beams of the superstructures;
- vertical movements (deflections) of the most loaded beams of superstructures in the middle of the span;
- stresses (relative strains) in the fibers
of reinforced concrete structures of the metro tunnel section on the inner side;
- vertical and horizontal displacements
of the controlled sections
of the metro tunnel section.