Abstract: A dust solidification apparatus including a storage tank for storing dust; a forming member that is disposed at a lower portion of the storage tank, the forming member being provided with a forming hole to allow the dust in the storage tank to flow in; and a first rod and a second rod that are opposed to each other, wherein the first rod and the second rod are driven to reciprocate by advancing into and withdrawing from the forming hole, and advance into the forming hole to compress the dust in the forming hole, wherein the first rod includes a rod tip and a rod base. The axially vertical cross-section of the rod tip of the first rod is larger than the axially vertical cross-section of the rod base of the first rod and is made smaller than the axially vertical cross-section of the forming hole.

Abstract: A dust solidification system includes: a preduster for sucking dust with a negative pressure generated by a negative pressure generating source, removing solidification-inhibiting substances from the dust, and making the dust with a reduced solidification-inhibiting substance content rate flow toward the source; a dust capturing mechanism for capturing the dust flowing from the preduster and allowing the dust to fall; a storage tank for storing the dust captured by and falling from the capturing mechanism; and a dust solidifying mechanism for solidifying the dust in a forming chamber; and further includes one or more of the following: a dust re-scattering prevention mechanism for preventing re-scattering of the dust falling from the capturing mechanism; a stirring mechanism for stirring the dust loaded into the solidifying mechanism; and an air releasing mechanism for preventing air from entering the forming chamber by releasing air flowing into the storage tank from the solidifying mechanism.

Abstract: A soft landing structure to be installed on the water bottom ground with decreased cost and construction time. The soft landing structure includes a ballast tank for storing a desired amount of water, a lower structure connected to a top of the ballast tank under the surface of the sea water, and an upper structure mounted on the lower structure at least a part of the upper structure is positioned above the surface of the sea water. The soft landing structure is placed on the water bottom ground which has been improved to increase strength of the ground against overall weight of the soft landing structure.