CAISSON FOR UNDERWATER PIPELINE REPAIR Russian patent published in 2007 - IPC E02D23/02 

FIELD: foundations, excavations, embankments, particularly caissons able to be floated on water and to be lowered into water in situ.

SUBSTANCE: caisson comprises chamber with stiffening ribs. The chamber includes two releasable parts, namely upper and lower ones. Caisson also has working shaft, replaceable rings and releasable replaceable yokes. The stiffening ribs are arranged inside the chamber. Replaceable rings are formed of shells connected with each other by annular ribs. Sealing packing between pipeline and replaceable rings with crimp packing barrels is formed of flexible sheet rubber material. Releasable yokes are installed on lower chamber part so that the yokes may be displaced relatively replaceable rings in radial direction. Flanges with dog-bolts and nuts are arranged at upper and lower chamber parts and extend along joint perimeter. Sealing gaskets of flange connections, which connect upper and lower chamber parts and shaft sections with each other and with coaming of upper chamber part, are formed of sheet air-free rubber material having increased wear strength. The sealing gaskets are flush-mounted in one flange.

EFFECT: increased caisson strength and reduced labor inputs for caisson connection and disconnection from pipeline.

3 cl, 8 dwg