Vinterstøping av fjellfundament

Winter Concreting of Rock Foundations

Norut Narvik, in collaboration with HeatWork and local contractors, tests and documents the efficiency of foundation construction methods in rock below 0 °C on behalf of Statnett.

Winter Concreting 2014/15

Layout at the beginning of ground heating on 27 Feb 2015. Sites of 4 foundations are labeled. The ground of foundations 1 and 2 is heated with an electrical system powered by a generator, foundations 3 and 4 are heated with a hydronic system (HeatWork MY35).

Measurements

Winter concreting work started on 27 Feb 2015 with heating of the ground. Rock bolts were set on 2 Mar 2015. Follow the progression of events at http://bm180.blogspot.no/.

Participating in construction of 4 foundations: Norut Narvik, HeatWork, Prestjord Maskin, Statnett.

13 Apr 2015Norut Narvik

Site of BM 180, Lavangen

Photo archive (older photos)

Temperature measurements are currently available in the following formats:

  • An Excel 2007 spreadsheet with data is here (.xlsx).

    This file can be opened with MS Office 2007 or later, MS Office Excel viewer, or Libre Office.

    Note: An Excel (xls) file can be generated as follows: Go to www.convertfiles.com, enter http://ndat.no/vs/data/BM180_consolidated_data.xlsx in the second box ("download it from") and click "Convert".

  • Raw data files are available here. The mapping file describing the measurements is here (.xml).
Files are updated up to 4 times a day (by 5:00, 11:00, 17:00, 23:00 UTC+1), and hourly while the battery is being charged.

Example measurements:

  • Battery Voltage: 12.3 V (24 Jun 2015, 10:00)
  • Air Temperature: 12.1 °C (24 Jun 2015, 10:00)
  • Temperature 1 m in the Rock: 5.9 °C (24 Jun 2015, 10:00)

See also weather forecast in the region (Gratangen turiststasjon) at yr.no.

Grouting Anchors

Rock Temperatures at Foundation 1, reference (interactive figure,png)
Rock Temperatures at Foundation 1, not-heated hole (interactive figure,png)
Rock Temperatures at Foundation 1, heated hole (interactive figure,png)
Rock Temperatures at Foundation 2, reference (interactive figure,png)
Rock Temperatures at Foundation 2, not-heated hole (interactive figure,png)
Rock Temperatures at Foundation 2, heated hole (interactive figure,png)
Rock Temperatures at Foundation 3, reference (interactive figure,png)
Rock Temperatures at Foundation 3, not-heated hole (interactive figure,png)
Rock Temperatures at Foundation 3, heated hole (interactive figure,png)
Rock Temperatures at Foundation 4, reference (interactive figure,png)
Rock Temperatures at Foundation 4, not-heated hole (interactive figure,png)
Rock Temperatures at Foundation 4, heated hole (interactive figure,png)
Data logger battery voltage starting 27 Feb 2015 (interactive figure, png) Battery charger is connected to generator used for Foundations 1 and 2. Note: Figure is not getting updated, anymore.
Hydronic system operation parameters (interactive figure, png) The high heating fluid flow rates may be measurement artefacts during de-airing of the system. Note: Figure is not getting updated, anymore.

Casting Footing and Column, Scheduled for 20 and 23 Mar

Footing Temperatures of Foundation 1 (interactive figure,png)
Column Temperatures of Foundation 1 (interactive figure,png)
Footing Temperatures of Foundation 2 (interactive figure,png)
Column Temperatures of Foundation 2 (interactive figure,png)
Footing Temperatures of Foundation 3 (interactive figure,png)
Column Temperatures of Foundation 3 (interactive figure,png)
Footing Temperatures of Foundation 4 (interactive figure,png)
Column Temperatures of Foundation 4 (interactive figure,png)

General

Rock Temperatures at Reference Site (interactive figure, png)
Rock Temperatures at Test Site (interactive figure, png) Data acquisition until 27 Feb 2015, only.
Data logger battery voltage (interactive figure, png)

Modeling

Senorge.no presents interpolated daily averaged temperature and precipitation fields throughout Norway. Interpolated weather data for the location of BM180, including one week of forecast is shown here. This plot is generated by the servers serving senorge.no. Note that no quality check of senorge.no data specific to the site of BM180 has been performed.
senorge.no weather plot 20171120-20171218
Weather plot for BM180 generated by senorge.no.
Using air temperature data of senorge.no for the location of BM180, the seasonal rock temperature development is being modeled by Norut. The model assumes that the rock is dry (note, however, that Prestjord Maskin found water approximately 3 m deep into the rock on 27 Oct 2014), no snow cover is present, skies are overcast, and that it is windy. Rock thermal properties are taken to be the same as at Djupvik, and a typical background heat flux from the mantle has been assumed. The model has been spun up for 100 years with monthly climatology data of the 1960s, followed by calculations based on air temperatures since 1 Jan 1958.
Results show that the 0°C isotherm reaches 6 to 9 m depth every winter. This deep penetration is due to the annual average air temperature being close to 0°C.
Using current air temperature data from senorge.no, including one week of temperature forecasts (data used are available here), the average temperature for 5 different layers is shown. To put model results of this season into perspective, modeled temperatures are also shown for the winters from 2000/2001 to 2013/2014.
BM180 rock temperature model
Modeled rock temperature at BM180 for winters since 2000/01 and for current year. Model assumes exposed rock and absence of snow.

Winter Concreting 2013/14

Documented construction of a power mast foundation was planned for January 2014 but had to be moved to a test site due to a series of circumstances (http://fm65.blogspot.no/). Winter construction of a rock foundation and documentation took place at a test site in Djupvik near Narvik mostly between 28 February and 6 March 2014.

Participating in the test construction: Norut Narvik, HeatWork, A. Markussen, Betong Renovering Rehab.

5 Mar 2014Norut Narvik

Winter concreting field test at Djupvik

About Norut

Norut (Northern Research Institute) is a Norwegian research group that produces knowledge with practical applicability relevant to the High North within technology and social science. We carry out research commissions for both private and public sectors.

About ColdTech

ColdTech is a project to develop and apply competence in Cold Climate Technology to the benefit of northern Norway. ColdTech is hosted by Norut Narvik and Narvik University College.

Get in Touch

  • Phone:
    +47 76 96 53 50
  • Email:
    info@tek.norut.no
  • Address:
    Norut Narvik
    Rombaksveien 47
    8517 Narvik, Norway