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7/29/2019 FE001P DD ST 001 Technical Report
http://slidepdf.com/reader/full/fe001p-dd-st-001-technical-report 1/20
7/29/2019 FE001P DD ST 001 Technical Report
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Rev. 0 Date
Mar. 2013
Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 1
TECHNICAL REPORT
INDEX
1. INTRODUCTION ....................................................................................................... 2
2. SCOPE OF WORK ..................................................................................................... 4
3. SURVEY ACTIVITIES .............................................................................................. 5
4. EXISTING UNDERGROUND UTILITIES ........................................................... 10
5. DESCRIPTION OF WORKS................................................................................... 12
6. CONCLUSIONS ........................................................................................................ 19
7/29/2019 FE001P DD ST 001 Technical Report
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Rev. 0 Date
Mar. 2013
Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 2
1. INTRODUCTION
Doubling of line No.1 between Hofuf and Siding No. 5 and between Siding No. 9 and km
443+600 in Riyadh includes the doubling of the existing bridge located at km 426+617.
The existing bridge’s deck consist of a 3 span concrete post-tensioned box girders, with a
constant height of 3.00 m. Girders are simply supported over each span.
Bridge view.
Girder section.
Each pier consist of a circular column with 3.00 m diameter and a height of 10.25 m. On
the top of each column are placed 4 elastomeric bearings.
Pier’s foundation are made by a 15x10x2.70 m plinth, placed about 6.00 m beneath the
ground level. Each footing is already prepared for the doubling of the bridge and rebars for
the connections with the future column are provided and protected by a small concrete
column.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 3
Column for protection of rebars anchors.
Abutments consists of a single column per deck, with the same dimensions as the pier’s
one, and a earth-retaining wall 3.55 m high. Columns are sustained by the same
15x10x2.70 m footing as the pier: also abutment’s foundations are prepared for the
doubling of the bridge. On the top of each column are placed 2 elastomeric bearings.
Differently from the pier, on abutments columns for the new deck are already builded.
The bearings layout provides free restraints on each abutment, 2 fixed and 2 free bearing
on one pier and 4 fixed bearings on the other pier. Each bearing is fixed in the direction
transverse to the deck axis.
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Rev. 0 Date
Mar. 2013
Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 4
2. SCOPE OF WORK
The targets of this project, as requested by Saudi Railway Organization, are:
1. doubling of the existing line located at km 426+617.
2. construction of a new bridge capable to 32.5 ton/axes loads, according to UIC
codes and Eurocodes;
An accurate diagnostic activity has been required to assess the actual conditions of the
structure.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 5
3. SURVEY ACTIVITIES
The examination of the existing structure has been carried out by mean of visual
inspections and laboratory test performed on specimens extracted from deck, columns and
footings. Also original drawings, structural calculation and geological report have been
found.
The visual inspection shown a structure in quiet good conditions, especially considering
that the structure dates back 30 years ago. Also the bearings, that usually are the first part
of the structure to need maintenance, seem to be in good conditions.
Deck external view.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 6
Deck internal view.
Pier’s column.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 7
Free bearing on abutment.
Fixed bearing on pier.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 8
Performed laboratory tests consist of:
• carbonation test by mean of phenolphthalein;
• uniaxial compression test for the determination of the compression strength of the
concrete;
• uniaxial compression test for the determination of the Young Modulus of the
concrete;
• ultrasonic test on concrete specimens;
• tensile test on steel bars.
A total number of 27 concrete specimens and 9 steel specimens have been collected.
Concrete specimens.
Steel specimen.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 9
Generally the tests shown concrete strength values lower than expected, while steelstrength abide the design value. No significant carbonation was detected on concrete
specimens.
Even if visual inspection gave a good impression of the structure, considering the low
strength values of the concrete and the fact that design loads are increased by 30% it was
decided to realize a new bridge with two spans (new abutments, new piers and new decks
with two spans: 28.45m and 34.45m).
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 10
4. EXISTING UNDERGROUND UTILITIES
A sewage pipe with 2400mm diameter (RCP V pipe) is localized under the central span of
the existing bridge.
Existing sewage pipe
The footing of the new pier is realized near the sewage pipe.
A “Π” shaped concrete structure is realized between the pier and sewage pipe. That
structure will serve as a protection for the sewage pipe.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 11
New pier and existing sewage pipe
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 12
5. DESCRIPTION OF WORKS
Considering the results of the survey activities work will consist in:
1. realization of “Π” shaped concrete structure for protection of sewage pipe;
2. realization of new abutments and piers;
3. realization of new deck adjacent to the existing one (on doubling line);
4. demolition of the existing piers;
5. removal of the existing deck and its demolition;
6. realization of new deck along the existing line.
The above activities will be scheduled in 16 phases.
Phase 1
In this phase is realized the “Π” shaped concrete structure for protection of sewage pipe.
After this is constructed the cofferdam for the new abutment on Riyadh side.
Phase 2
In this phase is realized the new abutment on Riyadh side.
Phase 2 – Part of longitudinal section
Phase 3-4-5
In these phases is realized the new pier.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 13
Phase 3-4-5- Part of longitudinal section
Phase 6-7-8
In these phases is realized the new abutment on Hofuf side.
Phases 6-7-8- Part of longitudinal section
Phase 9-10-11
In these phases is realized the new deck on doubling line. After phase 11 the rail traffic is
deviated on doubling line.
The new deck consist in a post-tensioned concrete box girder, with a constant height of
3.00 m.
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HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 14
New girder section.
Phases 9-10-11-Plan and longitudinal section
Structural pot bearings are provided on piers and abutments. For each span longitudinally
fixed restraint on one end and free restraint on the other end are provided; each end is
restrained transversally.
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Title: TECHNICAL REPORT
Page 15
Bearing layout provides:
• free longitudinal restraints on both abutments;
• two pairs of longitudinally fixed restraints on pier;
Bearings layout.
Phase 12-13-14-15
In these phases is demolished the existing deck and realized the new deck on existing line.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 16
Phases 12-13-14-15-Plan and longitudinal section
Phase 12 involves the demolition of the existing deck. Considering the closeness of the
train traffic on new deck the demolition plan has been studied with the aims of avoid
dangerous situations and reduce annoyance to the train circulation.
The demolition of the existing bridge involves the following sub-phases:
1. removal of rails, ballast and sand;
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Title: TECHNICAL REPORT
Page 17
2. removal of parapets;
3. demolition of the external cantilever;
4. demotion of internal cantilever;
5. lift of residual box girder, deposit at ground level and demolition.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 18
Phase 16 In this phase is completed the rail line on existing line, is realized the definitive road in
front of new abutment on Hofuf side and rail traffic is deviated on both lines.
Phass 16-Plan and longitudinal section
For further details regarding to construction phases, refers to the specific drawings.
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Project.: DOUBLING OF LINE BETWEEN
HOFUF AND RIYADH –
BRIDGE AT KM 426+617
Title: TECHNICAL REPORT
Page 19
6. CONCLUSIONS
The proposed design of the doubling of bridge at km. 426+617 has been carried out with
two targets:
• realize a new bridge adjacent to the existing one;
• ensure the structure’s safety under 32.5 ton/axis loads for both bridges.
Considering the increase of train loads and results of the laboratory tests on concrete
specimens, the existing structure was deemed not safe under new design loads and so it
was decided to realize a new bridge with two spans: 28.45 m and 34.45m: this solution
leads to an adequate safety level of the structure under new design loads.
In order to ensure safety conditions for the train traffic even during the works on the
bridge, the demolition of the existing bridge has been carefully planned, providing partial
demolition of the girder and then its removal and final demolition at ground level.
Also all phases of construction have been thought in order to minimize traffic
inconvenience.