Scaffoldless tank erection method
AssigneeChicago Bridge & Iron Company
InventorsHarold B. (“Scott”) Christian, William R. Easter
Life of this patent
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Abstract
A method of erecting the shell of an aboveground storage tank involves erection of the first shell ring; erecting the second and higher shell rings by using a mobile man lift to provide access for the construction personnel to the shell plates being erected; and anchoring the structure to reduce the risk of blow-ins from ambient wind.
Claims24
A method for building a storage tank without the need for erecting a stationary scaffold, the method comprising the steps of:
- placing shell plates in a first ring;
- providing temporary stiffening to the shell plates;
- placing shell plates in an upper ring above the first ring;
- and
- using a lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring.
A method for building a storage tank without the need for erecting a stationary scaffold, the method comprising the steps of:
- placing shell plates in a first ring;
- placing shell plates in an upper ring above the first ring;
- using a lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring;
- and
- assessing wind conditions by evaluating ambient wind speed in association with the diameter and height of the tank to determine if temporary stiffening is required.
A method for building a storage tank without the need for erecting a stationary scaffold, the method comprising the steps of:
- placing shell plates in a first ring;
- placing shell plates in an upper ring above the first ring;
- using a lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring;
- and
- providing temporary stiffening by installing shell anchors to the shell plates in the first ring.
A method for building a storage tank without the need for erecting a stationary scaffold, the method comprising the steps of:
- placing shell plates in a first ring;
- placing shell plates in an upper ring above the first ring;
- using a lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring;
- and
- providing temporary stiffening by temporarily installing a stiffener member at an intermediate position on the shell.
A method for building a storage tank without a scaffold, the method comprising the steps of:
- positioning a lift inside the periphery of the tank;
- placing shell plates in a first ring;
- providing temporary stiffening to some of the shell plates;
- placing shell plates in an upper ring above the first ring;
- using the lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring;
- removing the lift through an opening in the tank after substantially all of the shell plates have been placed;
- and
- sealing the opening after the lift is removed.
A method for building a storage tank without a scaffold, the method comprising the steps of:
- placing shell plates in a first ring;
- assessing wind conditions to determine if additional stiffening is desirable to reduce the risk of the placed shell plates buckling as a result of wind-produced air pressure differentials and, when it is determined that additional stiffening is desirable, providing temporary stiffening to the shell plates;
- placing shell plates in an upper ring above the first ring;
- using a lift to provide construction personnel with access to the shell plates in the upper ring for setting the shell plates and fitting seams in the upper ring;
- and
- suspending a carriage from an upper plate edge, and using the carriage as a platform for welding seams in the upper ring.
Dependencies are inferred from the claim text.