1 What difficulties are commonly associated with deep trench

1.            What difficulties are commonly associated with deep trenching? What techniques are commonly used to address such difficulties?

2.            What are the mods of failure that a driven end-bearing pile could experience?

3.       Discuss three of the possible causes of false pile bearing values.

4.       What safety measures should be taken while inspecting a pile driving operation?

5.       Discuss with examples some of the effects that admixtures can have on the concrete mix.

6.       What are the steps needed to properly remove forms from concrete?

7.       What are some of the possible reasons for delivered aggregate and reinforcing steel to fail inspection on site?

Solution

1.

Difficulties in deep trenching:

Techniques :

Vacuum dewatering by means of drains: This system is mainly used for the construction of sewerage systems and for pipelines as well as projects for dewatering large areas. The installed drains are directly connected to the pumps.

Installation of Geo-textiles: With specific adaptions to the drainage machine we are able to install a vertical screen of Geo-textile into the ground up to a depth of 5-6 metres.