Conventional drilling and grouting methods are used for this method of underpinning.
The work has been much more expensive than was envisaged initially because of the time involved and the amount of grouting that needs to be done.
I am bound to say, in reply to his speech, that with regard to grouting, my information, which may not be correct, is contrary to his.
Progress with the grouting is satisfactory, and the necessity for it will not cause any delay to the tunnelling.
It has done a thermal survey and has four rigs in the area, drilling and injecting grouting to fill the voids left by the burning seam.
The process is called grouting.
The grouting of one house is now complete and tests have been carried out.
An alternative might be to undertake a major repair work of grouting with concrete.
