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Lead or Rumour info - Tunnel aldershot

Discussion in 'Leads, Rumours and News...' started by oldblagger, Aug 20, 2016.

  1. oldblagger

    oldblagger 28DL Full Member
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    The tunnel opposite tesco in Aldershot seems to be open, it's nothing major but as far as I know there's no photographs of the inside, maybe of interest to someone...
     

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  2. Bertie Bollockbrains

    Bertie Bollockbrains 28DL Regular User
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    Interesting and thanks for the info. From a discussion on another website dated 2014, here's some quotes:

    There is a ventilation shaft that sticks out the ground positioned at the top of the old army cemetery in the wooded area this is for the tunnels they are all filled with water and the entrances are locked and sealed. Your best bet to visit an entrance is to walk over the other side of the road from Tesco car park and see the sealed hatch.

    There is an entrance to the tunnels on the other side of the road to Tesco. My Grandad had permission and went in to the tunnels with the MOD when he was building Tesco. I have lot of information on them but I’ll be in big trouble to share on this site, sorry.




    Finally, here's a document posted on a local history board talking of an MOD underground Command Centre under Cemetery Hill. I know nothing about the geography of Aldershot but wondering if this this it?
    To:- C.R.E.,
    1st Tunnelling Engineers,
    Tunbridge Wells


    SUMMARY OF CONSTRUCTION OF ALDERSHOT AREA SHELTER.
    Cemetery Hill, Map Ref. 31.4 70.9


    1. BORE HOLES.

    Prior to the commencement of the work, four boreholes were put down by No. 1 Boring Section R.E. From the information obtained from these, it was decided to provide for 75' of cover above the Chambers. This allowed for 10' of clay roof in the chambering.


    2. LAY OUT.

    This consisted of 2 parallel adits (6' x 7'), each approximately 370' in length and 170' apart. A Chamber system and Galleries (10' x 9') connecting the Adits extended to a total linear footage of 659', representing, with the Adits, a total of 76610 cu. ft. of excavation. The Adits were lined for the most part with timber sets, made of old railway sleepers, and partly with small Colliery Arches (5' x 6' 6"). The Chambering was lined with large Colliery Arches (8' x 9'). The general gradient throughout the system was 1 in 200.


    3. DIFFICULTIES MET WITH.

    (a) It was originally intended that one of the Adits should be an Incline, with the object of reducing the work entailed in excavating two long Adits. Shortly after commencing the Incline, running sand was encountered. In view of this unfavourable condition, it was decided to continue this Incline for instructional purposes only, and if completed, would form a third entrance to the Dugout. Later, as the work proceeded in the Incline, water was encountered immediately above the clay bed, and the work was abandoned. No difficulties were found in the construction of the Adits. Shortly after Chambering was commenced in the clay, the immediate need for support became necessary, as the clay, on exposure to air, became friable and cracked, and the general movement of the clay resulted. The lining of Colliery Arches standing on sole plates at 2' 9" centres, wrapped with galvanised iron sheeting, were not sufficiently strong to withstand the pressure. When work had reached the West end of the Chamber system, it was found that the clay bed overheade (sic) did not conform to that exposed in the nearest borehole. An intrusion of running sand was situated within the clay bed, leaving only about two feet of clay in the hanging. This came away and blocked the main gallery joining the Adits. The fall was followed by wet sand and considerable caving took place. In view of the water and disturbed nature of the ground at this end, a by-pass to the West Adit was constructed and the chambering was extended at the East end where the ground overhead was less disturbed.

    (b) The clay pressure previously mentioned distorted the Colliery Arches, bulged the galvanised iron sheeting between them, and thrust in the legs of the Arches themselves.


    4. METHOD OF STRENGTHENING ADOPTED.

    (a) Large Colliery Arches were erected between the existing sets, including the junction sets, throughout the Dugout system.

    (b) Sills formed of railway sleepers were placed between the sets.

    (c) Struts of wood were placed between the sets throughout, and where necessary bulging iron was cut out first.

    (d) Owing to the water seepage at the West end, a drainage system was installed and discharged by gravitation through buried pipes down one of the adits.

    (e) Concrete flooring was laid throughout the dugout. This was commenced by the Company and completed by Civil Contractors.


    5. DISPOSAL OF SOIL.

    All spoil was trammed out on the level to one tipping point from which the soil was transported to lorries to a dump about a quarters (sic) of a mile distant.


    6. METHOD OF WORK.

    The Galleries were driven by pneumatic spaders and the spoil was hand filled into steel tubs and trammed to the tip. The compressor, which was run on diesel oil, was maintained at a working pressure of 100 lbs per cubic foot.


    7. GENERAL.
    The excavating work provided the full accommodation for this shelter was commenced on 26.10.40 and was completed on 28.2.41. From 28.2.41 to 5.4.41 a reduced working party of the Company was employed on a programme of strengthening the lining, etc., as previously outlined. A Detachment of the 185th A.M.P.C.(50 Group) assisted in the work from 17.1.41 to 5.4.41.

    (Signed) A.C.R.M Sim
    Major R.E.
    Officer Commanding,
    171 Tunnelling Coy. R.E.
    12th April 1941.
     
  3. oldblagger

    oldblagger 28DL Full Member
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    Good stuff
     
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