Peculiarities of Reconstruction Work …
21
Fig. 6 Schematic structural diagrams of destruction and reconstruction of bridge structures in case
of probable destruction variant 4: a superstructure after destruction of pier no. 15; b superstructure
after reconstruction
using methods, conceptual sketches of which are reproduced in Figs. 3, 4, 5 and 6
using black to indicate reconstructed bridge decks. And the adjacent spans of the
multi-span continuous girder, which remained undamaged and are shown in Figs. 3,
4, 5 and 6 in gray, as a result of destruction of one span, they turn into either simple
girders or into two-span or four-span structures instead of five-span or six-span ones.
Therefore, considering such significant transformation of the initial design layout,
the forces in structural members of the adjacent intact girder spans are increasing, and
the spans themselves according to the results of checking calculations will require
some reinforcement.
It is proposed to replace completely destroyed spans with newly manufactured
three types of similar inventory constructions of steel box girders and the carriageway
in form of steel orthotropic deck, in the first of which the distance between two
box girder axes is 9500 mm, in the second one—11,900 mm, and in the third one
it is planned to install three box girders at a distance of 7300 mm between them
(Fig. 7). It is interesting here that the indicated distances are caused by only one
objective criterion—the layout of girders on the support between the bearing structures of undamaged sections of the spans. The height of the girders for 87.0 m span
is taken 3600 mm, and for 56.0 m span—3100 mm. In addition, it should be noted
that according to the results of comparing the three proposed types of inventory
constructions, the second variant, in which two main girders are installed at a center
distance of 11,900 mm, turned out to be the most economic and least labor-intensive
for manufacturing and installation.
As for the design solution of proposed superstructure unit, it consists of seven
elements of the same type, suitable in size for railway transportation: two units
of box girders and five plates of the orthotropic deck. In this case, the plates are
only two makes—the intermediate plate and the end plate. The main girders of the
span are box-shaped, of rectangular cross-section, 2300 mm wide and 3100 and
3600 mm high, depending on the span. The lateral stiffness of the superstructure is
21
Fig. 6 Schematic structural diagrams of destruction and reconstruction of bridge structures in case
of probable destruction variant 4: a superstructure after destruction of pier no. 15; b superstructure
after reconstruction
using methods, conceptual sketches of which are reproduced in Figs. 3, 4, 5 and 6
using black to indicate reconstructed bridge decks. And the adjacent spans of the
multi-span continuous girder, which remained undamaged and are shown in Figs. 3,
4, 5 and 6 in gray, as a result of destruction of one span, they turn into either simple
girders or into two-span or four-span structures instead of five-span or six-span ones.
Therefore, considering such significant transformation of the initial design layout,
the forces in structural members of the adjacent intact girder spans are increasing, and
the spans themselves according to the results of checking calculations will require
some reinforcement.
It is proposed to replace completely destroyed spans with newly manufactured
three types of similar inventory constructions of steel box girders and the carriageway
in form of steel orthotropic deck, in the first of which the distance between two
box girder axes is 9500 mm, in the second one—11,900 mm, and in the third one
it is planned to install three box girders at a distance of 7300 mm between them
(Fig. 7). It is interesting here that the indicated distances are caused by only one
objective criterion—the layout of girders on the support between the bearing structures of undamaged sections of the spans. The height of the girders for 87.0 m span
is taken 3600 mm, and for 56.0 m span—3100 mm. In addition, it should be noted
that according to the results of comparing the three proposed types of inventory
constructions, the second variant, in which two main girders are installed at a center
distance of 11,900 mm, turned out to be the most economic and least labor-intensive
for manufacturing and installation.
As for the design solution of proposed superstructure unit, it consists of seven
elements of the same type, suitable in size for railway transportation: two units
of box girders and five plates of the orthotropic deck. In this case, the plates are
only two makes—the intermediate plate and the end plate. The main girders of the
span are box-shaped, of rectangular cross-section, 2300 mm wide and 3100 and
3600 mm high, depending on the span. The lateral stiffness of the superstructure is