V3ctra
2017-05-06 13:14:08
- #1
Hello everyone,
We have now completed our input planning meeting. The draftsman pointed out that WU light wells may be required according to the soil investigation report. One light well including insulation is estimated to cost about €2000, and 4 units are planned.
We have already included light wells with drainage in the offer, but these are not watertight.
The report states the following:
Seepage water / accumulated seepage water / design water level
was not investigated on 10.01.2017.
The soil moisture within the soil layers explored in the boreholes can be described as dry to very moist. The occurrence of accumulated surface water on cohesive layers (e.g., silt/clay layers) as well as above the underlying rock horizon cannot be excluded.
The amount of accumulated surface water depends on previous rainfall and can be well managed during the construction period by means of surface water pumps (possibly in the form of a construction water retention system: system of drainage ditches/pipes and sump pumps).
The design water level is initially to be assumed here with a safety allowance of 1.0 m above the bottom edge of the floor slab (~1.6 m below the ground surface) based on experience with comparable soils/ground conditions. A refinement (allowance in case of indications of possible oxidation/reduction horizons, i.e. groundwater-influenced areas) can be made after inspection of the excavation base or the excavation itself. Furthermore, it is recommended to assign a gravel drainage layer around the lower third of the working space combined with a 0.20 m thick layer with capillary-breaking properties beneath the floor slab. This achieves rapid distribution of incoming water as well as regulation of local water inflows.
.....
When executed in WU concrete or as a white tank, the specifications of the WU guideline (DAfStb, 2006), DIN EN 206-1, and DIN 1045-2 apply; the standards DIN 18195-4 and 6 and VOB/C ATV 18336 do not apply according to own statements for constructions made of watertight concrete. The stress class 1 according to the WU guideline is to be assumed. The service class is to be determined by the specialist planner.
If light wells are to be executed here, they must be made pressure-water-tight or incorporated into the overall sealing concept or positioned at a corresponding height.
.....
If the light wells are now planned as high as possible, would it then be possible to use our "normal" light wells, right?
Thanks in advance for your answers.
Regards
We have now completed our input planning meeting. The draftsman pointed out that WU light wells may be required according to the soil investigation report. One light well including insulation is estimated to cost about €2000, and 4 units are planned.
We have already included light wells with drainage in the offer, but these are not watertight.
The report states the following:
Seepage water / accumulated seepage water / design water level
was not investigated on 10.01.2017.
The soil moisture within the soil layers explored in the boreholes can be described as dry to very moist. The occurrence of accumulated surface water on cohesive layers (e.g., silt/clay layers) as well as above the underlying rock horizon cannot be excluded.
The amount of accumulated surface water depends on previous rainfall and can be well managed during the construction period by means of surface water pumps (possibly in the form of a construction water retention system: system of drainage ditches/pipes and sump pumps).
The design water level is initially to be assumed here with a safety allowance of 1.0 m above the bottom edge of the floor slab (~1.6 m below the ground surface) based on experience with comparable soils/ground conditions. A refinement (allowance in case of indications of possible oxidation/reduction horizons, i.e. groundwater-influenced areas) can be made after inspection of the excavation base or the excavation itself. Furthermore, it is recommended to assign a gravel drainage layer around the lower third of the working space combined with a 0.20 m thick layer with capillary-breaking properties beneath the floor slab. This achieves rapid distribution of incoming water as well as regulation of local water inflows.
.....
When executed in WU concrete or as a white tank, the specifications of the WU guideline (DAfStb, 2006), DIN EN 206-1, and DIN 1045-2 apply; the standards DIN 18195-4 and 6 and VOB/C ATV 18336 do not apply according to own statements for constructions made of watertight concrete. The stress class 1 according to the WU guideline is to be assumed. The service class is to be determined by the specialist planner.
If light wells are to be executed here, they must be made pressure-water-tight or incorporated into the overall sealing concept or positioned at a corresponding height.
.....
If the light wells are now planned as high as possible, would it then be possible to use our "normal" light wells, right?
Thanks in advance for your answers.
Regards