Rainwater sewage system in Gdynia

Implementation of the project: Construction of a water supply and sanitary sewage system in Kasprowicza street in Gdynia.

The scope of work included the execution of the rainwater drainage system, the section from the D-6 well to the D-8 well, through the D-7 well and the sanitary sewage system from the S-2 well to the S-3 well. As part of the entire task, trenchless laying of the channel was made of modular pipes PP 225x13.8x600 / 700 and 315x17.9x600 / 700. The total length of the rainwater drainage system made with the use of pipe 315 is approximately 60 meters. The total length of the sanitary installation performed using the 225 pipe is approximately 35 meters. The following study concerns the construction of a fragment of the rainwater system from the D-6 well to the D-7 well.

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The course of the rainwater drainage system D-6 -> D-7

There are utilities in the construction section of the storm water drainage system:
- sanitary sewage system,
- waterworks,
- telecommunications cables,
- power cables,
- gas pipelines,
- district heating channel

The route of the construction of the rainwater canal is marked on the roads and under the all-terrain stairs. The following parameters were adopted for the example section D-6 -> D-7:

F = 0,39 + 0,2 = 0,59ha
Q = 0,59 x 0,4 x 174 = 41,0 dm3/s
i = 24,0 %
Ø 0,30m
t = 5 cm
V = 6,0 m/s

profil
Profile of the rainwater drainage system D-6 -> D-7

The construction site was located in the vicinity of the seaside strip and the beach in Gdynia Redłowo. Despite the fact that, on the basis of the Regulation of the Minister of Transport, Construction and Maritime Economy of April 25, 2012, that the ground conditions in the investment area belong to the simple category, the construction area was classified as the second geotechnical category due to the depth of foundation of the installation.

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Picturesque coastal areas around Gdynia, surrounding the construction site. View of the Bay of Gdańsk.
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Location of the D-6 Start Well and the D-7 Intermediate Well.
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Narrow working area around the D-6 Start Well.
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A working set for making precise drilling using the Gravity Drilling technology.
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Starting well D-6. Preparation for pilot drilling.
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Drill rods prepared for the installation.
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A set of hydraulic aggregates for powering drilling equipment.
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Pilot drilling process.
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Verification of the correctness of the drilling trajectory using the Localization Kit.
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Online reading of the drilling head position. Visible reading of the current depth and percentage gravity drop.
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View of the construction site.
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D-6 starting well and drilling route under the stairs to the D-7 well.
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Gravity drilling rig in the D-6 well and pilot drilling.
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Preparation of intermediate wells D-7 for the implementation of gravity installation.
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Drilling the wall of the D-7 intermediate well as an operation to prepare for pipe pulling.
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Reaming the channel after passing the pilot drilling with simultaneous pulling of the pipe module.
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Construction of a pipe by connecting successive pipe modules together.
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Building a pipe and pulling in its successive segments.