Method for forming a pile wall in ground and a corresponding pile wall

A method for forming a unified watertight pile wall in ground using a drilling device with a reamer and flushing with a medium to remove drilling waste during drilling, and non-rotating pipe piles each equipped with interlocks extending outside a diameter of the reamer and including a long interlocking member having a first length and a short interlocking member having a second length shorter than the first length, the method comprising steps of:

• drilling a first vertical drill hole in the ground using the drilling device while simultaneously using the drilling device to draw a first one of the non-rotating pipe piles into the first vertical drill hole:
• drilling at least one subsequent vertical drill hole in the ground adjacent the first vertical drill hole using the drilling device while simultaneously using the drilling device to draw a subsequent one of the non-rotating pipe piles into the at least one subsequent vertical drill bole, wherein the long interlocking member of the subsequent pipe pile interlocks with the short interlocking member of the first pipe pile to guide the subsequent pip pile into the at least one subsequent vertical drill hole;
• installing reinforcements in each of the vertical drill holes;
• casting concrete into each of the pipe piles installed in a respective one of the vertical drill holes to form respective concrete piles;
• lifting the pipe piles at least partly out of some of the adjacent vertical drill boles after the concrete has been cast, but before a transition of the concrete from a fluid concrete paste to a rigid concrete to expand the concrete of each concrete pile laterally to adjacent vertical drill holes to form the unified watertight pile wall;
• wherein the drilling includes drilling at least some of the vertical holes only down to a surface of a bedrock;
• placing in the reinforcements at least one hollow reinforcement inside of which is a reserve pipe;
• leaving the reserve pipe empty during concrete casting;
• after lifting of the pipe piles and hardening of the concrete pile, drilling a locking hole in the bedrock through the reserve pipe;
• and
• setting a rock bolt in the reserve pipe to lock the pile wall to the bedrock.

A method for forming a unified watertight pile wall in ground using a drilling device with a reamer and flushing with a medium to remove drilling waste during drilling, and non-rotating pipe piles each equipped with interlocks extending outside a diameter of the reamer and including a long interlocking member having a first length and a short interlocking member having a second length shorter than the first length, the method comprising steps of:

• drilling a first vertical drill hole in the ground using the driling device while simultaneously using the drilling device to draw a first one of the non-rotating pipe piles into the first vertical drill hole;
• drilling at least one subsequent vertical drill hole in the ground adjacent the first vertical drill hole using the drilling device while simultaneously using the drilling device to draw a subsequent one of the non-rotating pipe piles into the at least one subsequent vertical drill hole, wherein the long interlocking member of the subsequent pipe pile interlocks with the short interlocking member of the first pipe pile to guide the subsequent pipe pile into the at least one subsequent vertical drill hole;
• installing reinforcements in each of the vertical drill holes;
• casting concrete into each of the pipe piles installed in a respective one vertical drill holes to form respective concrete piles;
• and
• lifting the pipe piles at least partly out of some of the adjacent vertical drill holes after the concrete has been cast, but before a transition of the concrete from a fluid concrete paste to a rigid concrete to expand the concrete of each concrete pilelaterally to adjacent vertical drill holes to form the unified watertight pile wall that extends in contact with a body of water in a form of a harbour structure;
• wherein the lifting the pipe piles comprises raising at least a part of the pipe piles at least partially out of a respective one of the vertical drill holes by at least part of a length of the vertical drill hole in an area of the ground of a floor of the body of water after casting of the concrete but before the transition of the cast concrete from the fluid concrete paste to the rigid concrete, wherein the pipe piles remain as a part of the pile wall above the ground of the body of water.

A method for forming a unified watertight pile wall in ground using drilling device with a reamer and flushing with a medium to remove drilling waste during drilling, and non-rotating pipe piles each equipped with interlocks extending outside a diameter of the reamer and including a long interlocking member having a first length and a short interlocking member having a second length shorter than the first length, the method comprising steps of:

• drilling a first vertical drill hole in the ground using the drilling device while simultaneously using the drilling device to draw a first one of the non-rotating pipe piles into the first vertical drill hole;
• drilling at least one subsequent vertical drill hole in the ground adjacent the first vertical drill hole using the drilling device while simultaneously using the drilling device to draw a subsequent one of the non-rotating pipe piles into the at least one subsequent vertical drill hole, wherein the long interlocking member of the subsequent pipe pile interlocks with the short interlocking member of the first pipe pile to guide the subsequent pipe pile into the at least one subsequent vertical drill hole;
• installing reinforcements in each of the vertical drill holes;
• casting concrete into each of the pipe piles installed in a respective one of the vertical drill holes to form respective concrete piles;
• lifting the pipe piles at least partly out of some of the adjacent vertical drill holes after the concrete has been cast, but before a transition of the concrete from a fluid concrete paste to a rigid concrete to expand the concrete of each concrete pile laterally to adjacent vertical drill holes to form the unified watertight pile wall;
• installing the pipe pile in a sensitive area using compressed air inside the pipe pile for flushing up the drilled material mainly inside the pipe pile;
• and
• during drilling with compressed air, pumping water simultaneously to the drill hole in an area of a lower end of the pipe pile through a channel located outside the pipe pile to limit dropping of groundwater levels in the vertical drill hole.

A unified pile wall, comprising:

• parallel concrete piles extending only down to an upper surface of a bedrock as a stable, uncompressed layer of drilled ground, each concrete pile including:
• an essentially circularly shaped cross-section;
• an outer surface;
• vertical reinforcements set inside the concrete pile;
• transverse reinforcements binding the vertical reinforcements in the concrete piles to each other;
• wherein the concrete piles are connected in a row at a constant distance from each other by a fully integrated concrete structure comprising a sector of 1°-50° of a cross-section of each concrete pile at a whole depth of each concrete pile to form the unified pile wall having a contact surface formed on the outer surface of the concrete piles, the unified pile wall being integrated with the bedrock;
• further comprising a reserve pipe fitted inside a vertical reinforcement of at least one of the concrete piles;
• and
• a rock bolt fitted through the reserve pipe into a locking hole drilled into the rock through the reserve pipe to lock the concrete piles into the bedrock horizontally.

A unified pile wall, comprising:

• parallel concrete piles, each concrete pile including
• an essentially circularly shaped cross-section;
• an outer surface;
• vertical reinforcements set inside the concrete pile;
• and
• transverse reinforcements binding the vertical reinforcements in the concrete piles to each other;
• wherein the concrete piles are connected in a row at a constant distance from each other by a fully integrated concrete structure comprising a sector of 1°-50° of a cross-section of each concrete pile at a whole depth of each concrete pile to form the unified pile wall having a contact surface formed on the outer surface of the concrete piles, the unified pile wall being integrated with a stable, uncompressed layer of drilled ground;
• and
• wherein the transverse reinforcements are spring reinforcements joined to the vertical reinforcements, the transverse reinforcements being configured to be compressed inside a pipe pile and to spread in essentially a transverse direction of the pipe piles and in a longitudinal direction of the unified pile wall prior to the concrete of the concrete piles hardening to reinforce the unified pile wall when lifting the pipe pile.