Post-grouting method for immersed tube joint base

A method for grouting a base of a final joint between immersed tubes, the method comprising:

• disposing a plurality of grouting tubes in furrows between gravel mattresses on an underwater geologic structure, wherein the plurality of grouting tubes are configured to output a solidifiable slurry, the furrows comprise (i) a first large furrow between edges of first and second ones of the gravel mattresses, (i) a second large furrow between edges of the second one of the gravel mattresses and a third one of the gravel mattresses, and (iii) small furrows in a top of the gravel mattresses, the small furrows being smaller than the large furrows;
• disposing stop components in the small furrows, wherein the stop components fill the small furrows;
• after disposing the stop components, simultaneously backfilling the final joint and the immersed tubes;
• and then
• grouting the base of the final joint and the immersed tubes using the plurality of grouting tubes.

A method for grouting a base of a joint between immersed tubes, the method comprising:

• disposing a grouting tube in a furrow between gravel mattresses on an underwater geologic structure, wherein the grouting tube is configured to output a solidifiable slurry, wherein the furrow comprises (i) a large furrow between edges of adjacent ones of the gravel mattresses, and (ii) small furrows in a top of the gravel mattresses, the small furrows being smaller than the large furrow;
• disposing stop components in the small furrows, wherein the stop components fill the small furrows;
• after disposing the stop components, simultaneously backfilling the immersed tubes;
• and then
• grouting the base of the joint between the immersed tubes using the grouting tube.