A work gondola apparatus is provided with: a work cage into which a worker boards; equipment mounting parts disposed on both outer sides of the work cage; battery-driven elevating/lowering mechanisms which are mounted to the respective equipment mounting parts and which elevate/lower the work cage to a working location by means of cables that are being suspended; and batteries for driving the respective elevating/lowering mechanisms.

A method for removal of a temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, and equipment therefor. The removal method comprises the following steps: removing cantilever beams; removing lateral pier support systems and loading same onto a truck; removing outer-side main beam sections connected to lateral pier support systems and loading same onto a truck; removing, horizontally displacing, and lowering a main beam middle section connected to the main pier support system; hoisting, lowering, and laying flat a main truss system, and loading same onto a truck; and removing a main pier vertical support system and a pad beam.

A method for removal of a temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, and equipment therefor. The removal method comprises the following steps: removing cantilever beams; removing lateral pier support systems and loading same onto a truck; removing outer-side main beam sections connected to lateral pier support systems and loading same onto a truck; removing, horizontally displacing, and lowering a main beam middle section connected to the main pier support system; hoisting, lowering, and laying flat a main truss system, and loading same onto a truck; and removing a main pier vertical support system and a pad beam.

A method for removal of a temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, and equipment therefor. The removal method comprises the following steps: removing cantilever beams; removing lateral pier support systems and loading same onto a truck; removing outer-side main beam sections connected to lateral pier support systems and loading same onto a truck; removing, horizontally displacing, and lowering a main beam middle section connected to the main pier support system; hoisting, lowering, and laying flat a main truss system, and loading same onto a truck; and removing a main pier vertical support system and a pad beam.

A method for removal of a temporary support system for a road bridge pre-fabricated small box girder-type concealed bent cap, and equipment therefor. The removal method comprises the following steps: removing cantilever beams; removing lateral pier support systems and loading same onto a truck; removing outer-side main beam sections connected to lateral pier support systems and loading same onto a truck; removing, horizontally displacing, and lowering a main beam middle section connected to the main pier support system; hoisting, lowering, and laying flat a main truss system, and loading same onto a truck; and removing a main pier vertical support system and a pad beam.

A concrete deck demolition method for demolishing a concrete deck. The demolition method includes cutting two access windows into the concrete deck, installing a guide rail along a structural beam, making two tilted cuts on an upper surface of the structural beam, supporting the weight of the concrete deck utilizing an arching effect created by the geometry of the tilted cuts and lifting away a concrete deck cut portion for further demolition process.

A concrete deck demolition method for demolishing a concrete deck. The demolition method includes cutting two access windows into the concrete deck, installing a guide rail along a structural beam, making two tilted cuts on an upper surface of the structural beam, supporting the weight of the concrete deck utilizing an arching effect created by the geometry of the tilted cuts and lifting away a concrete deck cut portion for further demolition process.

A suspension cable replacement device includes a power unit and a plurality of adjustment units. The plurality of adjustment units is disposed around a suspension cable to be replaced. The power unit is configured to power the plurality of adjustment units. Each adjustment unit includes a support frame, a connector, and a steel strand. The power unit includes two jacks each including a main body. The support frame includes two support columns, a top part, and a bottom part. The top part includes a first through hole, and a nut fixed on an anchor is disposed in the first through hole; a hanger rod is disposed through the anchor and the nut, and fixed in the nut. The bottom part includes a second through hole, and the steel strand is disposed through the second through hole. The connector is disposed in the central cavity of the support frame.

A base material adjusting method capable of removing an already-existing coating film with one time construction, which is suitable in terms of prevention of health problems of operators and in terms of environmental protection, and capable of suppressing disposal costs of waste. The base material adjusting method includes a coating film removing step of removing an already-existing coating film of a work object of the repainting operation by a wet blast method, and a rust removing step of removing rust generated after the coating film removing step by a dry blast method, and rust inhibitor is not included in slurry used in the wet blast method in the coating film removing step.

The present invention provides a structure protection sheet capable of dramatically reducing a construction period to place protective layers on surfaces of structures such as concrete, protecting the structures for a long time, preventing swelling phenomena caused by water vapor inside the concrete, and preventing a decrease in attachability. The present invention relates to a structure protection sheet including: a polymer cement cured layer on a side facing a structure; and a resin layer on the polymer cement cured layer, the structure protection sheet having a water vapor transmission rate of 10 to 50 g/m.sup.2.Math.day.