Abstract: A clamped-down bridge comprises a superstructure supported by pontoons, each end of the bridge being fixedly secured to the bottom by means of anchors and anchor cables and clamped down to the expected maximum load by means of sinkers and sink cables. The anchor cables and the sink cables are wound in pairs onto common shafts in such manner that winding up of the sink cables causes unwinding of the anchor cables, and vice versa. The shafts are, by a motion transfer arrangement, connected with each other and with an automatic locking device which allows vertical adjustment of the bridge due to changes in the water level, but which locks against vertical adjustment due to wave action or the bridge being loaded.