This construction method includes rehabilitating the ground with a Jet Grout Column.

 

MACHINE / EQUIPMENT

 

The Machinery-Equipment summarized below will be used in the construction of the work.

 

Drilling Machine

It will be done with a CASAGRANDE C6/C8 or equivalent machine with a diameter of 4" or φ90 mm, which can go down to the depth shown in the project and can perform rotary drilling.

 

Jet Grout Equipment

Injection equipment will consist of high pressure hydraulic pumps with a capacity of 400-700 Bar and high turbulence injection units.

 

Secondary Machines

Other equipment to be used in addition to the machines mentioned in 2.1 and 2.2 above, respectively:

 

Compressor

Water pump

Silo vs.

 

CONSTRUCTION METHOD

Columns with a diameter of ..... cm seen in the project will be manufactured at the points shown in the project.

 

Drilling Method

As stated above, the drilling will be done rotary with the help of water and with a diameter of φ90 mm. Drilling will be carried out in one step and up to the specified depth.

 

 

 

. The area where the jet grout will be produced will be leveled and a smooth working platform will be created on which the machine will walk.

 

. The points where the jet grout manufacturing axes will be applied on the working platform will be precisely marked.

 

. Jet grout pre-drilling will be made up to the depths shown in the project with the help of an average 4" or 90 mm diameter drilling tool and water jet (See Appendix).



Test

Before starting the works, a few test columns are manufactured to determine the parameters to be used in jet grout column production, preferably close to the working areas and in the same formation, and after 1-2 days, the surroundings are opened and observations are made. The parameters used in the diameter closest to the determined diameter are used in the application.

Creating a Jet Grout Column

• When the desired depth is reached, the "orifice" at the drill bit will be closed and a 1/1 cement/water mixture will be pressed onto the ground with high pressure from two nozzles located just behind the drill bit, defined as the monitor.

• In order to form jet grout columns with D = ....... m diameter and ....... Jet grout columns will be manufactured using the most ideal parameters obtained during the test phase of the jet grout pressure to be applied.

Whether or not jet grout columns of the diameter and length envisaged in the project with the above-recommended values can be formed in the ground conditions at the work site will be determined by the tests carried out under the supervision of the Employer at the beginning of the work. Following these tests, the jet grout pressure to be applied, the constant drawing speed rotation values will be decided. The Contractor shall comply with the instructions of the Employer and/or the Engineer regarding these matters.

• The diameters of the nozzles used will be constantly checked and changed if necessary. During production, the pump pressure gauge will be checked continuously, and if the pump pressure exceeds the specified pressure value, jet grout production will be stopped and the nozzle will be checked whether it is clogged.