Compliance Report of Adit-1A, Adit-II and Face-1,2,3 & 4


                                                            COMPLIANCE REPORT                                                         
           
100/MHPA/HRT/General Correspondence/2019/                                                        Date: 03.06.2019

REF:     1. Inspection Report of HRT of Mangdechhu Hydroelectric Project on 23rd May 2019 submitted by HRT Inspection Team from DHPS, DGPC & the internal HRT inspection team from MHPA. (After Emptying the WCS)
            2. Letter from Consultant, NHPC No NH/DD-II/Mang/11/33 dated 01.05.2019 (Leakage of water from HRT Adits and Gates)
            3. Tour Report of Design Team from NHPC vide letter no NH/DD-II/Mang/11/2383 dated 20.05.2019.
The compliance has been done as per discussion with Chief Engineer I/c (HRT) and as directed. The compliance report is submitted for HRT Adit-IA, Adit-II & Face 1-2-3&4.
ADIT- IA:
  • ·         Face of Adit Plug was treated with 3 layers of Penetron.
  • ·         The unplugged Grout hole in Gallery was re-grouted and plugged with Epoxy mortar.
  • ·         Gallery treatment with one layer of V-groove finished with Epoxy and 3 layers of Penetron was done where some dampness was observed.
  • ·         Daily monitoring of seepage was carried out by installing V-notch (Readings attached as Annexure-1)
  • ·         The other portion of Adit Plug towards Portal was completely dry and no seepage was observed. No additional consolidation grouting in the Adit beyond the concrete plug up to 10m from the last leakage point towards Adit portal was done.

·         ADIT-II:
  • ·         Daily monitoring of seepage was carried out by installing V-notch (Readings attached as Annexure-2)
  • ·         3 Nos. Holes, 6 mtr length were drilled along the adit Plug one at centre and two nos above SPL on either side beyond the adit plug. Grouting was carried out at the pressure of 3-5 Kg/cm2 .
  • ·         Additional 4.5 mtr long hole was drilled at location on the left crown behind adit plug where some seepage was observed earlier. Grouting was carried out at the pressure of 3-5 Kg/cm2. 
  • ·         Consolidation grouting beyond concrete plug up to 10 mtr was carried out at three sections 3 m c/c .
  • ·         For 7th and 8th panel joints of inspection gallery, 4 Nos. of 500mm depth grout holes was drilled and grouted. V-groove finished with 3 layers of penetron was applied.
  • ·         Face of Adit Plug where dampness was observed, one layer of V-groove finished with Epoxy and 3 layers of Penetron was carried out.

FACE-IV:
  • ·         As pointed out in the Inspection Report, Cold joint at RD 15 m was rectified by providing V-groove finished with Epoxy treatment.
  • ·         Grout hole at RD 680 m (r/s) was plugged with a mixture of Bentonite and Epoxy.
  • ·         Grout holes at RD 1400 m (r/s & l/s) was plugged with a mixture of Bentonite and Epoxy.
  • ·         Fine debris deposited on the Invert b/w RD 1440 – 1460 m was removed.

Submitted for kind information and further instruction, if any please.


      Signed                                                                                                                                          
(ChengaPenjor)                                                                                                                       (HimanshuNagpal)
AEE. Adit-II                                                                                                                                        EE, Adit-I & II


Chief Engineer I/c (HRT)

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