A pipe expansion apparatus according to the present invention is characterized in that a tube is easily inserted into an inner pipe due to being inserted in a state in which the outer diameter of the tube is reduced, and the inner pipe is easily inserted into an outer pipe due to being inserted while tightly fixed to the tube by expanding the tube after the tube is inserted into the inner pipe.
The present invention may manufacture a composite pipe by forming an adhesive layer and a resin layer on an outer surface of a metal pipe, and although the composite pipe is wound in a ring shape after the composite pipe is manufactured, a circular cross sectional shape may be maintained without deformation, and after the composite pipe is straightened for the purpose of construction, separation or buckling may be prevented, resulting in excellent transportability and constructability of a product.
B23K 31/00 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups
F16L 9/147 - Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
B29C 48/09 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
B29C 48/285 - Feeding the extrusion material to the extruder
B23K 31/02 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups relating to soldering or welding
B05D 1/26 - Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
B29C 48/28 - Storing of extruded material, e.g. by winding up or stacking
The present invention may manufacture a composite pipe by forming an adhesive layer and a resin layer on an outer surface of a metal pipe, and although the composite pipe is wound in a ring shape after the composite pipe is manufactured, a circular cross sectional shape may be maintained without deformation, and after the composite pipe is straightened for the purpose of construction, separation or buckling may be prevented, resulting in excellent transportability and constructability of a product.
F16L 9/127 - Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
F16L 9/147 - Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
B29C 48/09 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
B29C 48/285 - Feeding the extrusion material to the extruder
B05D 1/26 - Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
B29C 48/28 - Storing of extruded material, e.g. by winding up or stacking
4.
WATER TANK WITH IMPROVED DURABILITY BY HAVING STRUCTURE IN WHICH TRAINING WALL HAVING OPENING FOR MANHOLE FORMED THEREIN IS INTEGRATED WITH INNER AND OUTER WALLS OR BOTH SIDE WALLS
A water tank according to the present invention is characterized in that a training wall is installed to be integrally coupled to inner and outer tanks (in the case of a cylindrical water tank) or both side walls (in the case of a rectangular water tank) to support the inner and outer tanks or both side walls, the training wall is formed by a bent panel to have excellent supporting force, an opening for a manhole through which a worker can pass is formed in the training wall to allow the worker to move therethrough, and the opening for a manhole and a through-hole are disposed to allow stored water to flow in down-up and left-right directions in a zigzag manner due to a vortex.
The present invention is a composite pipe manufactured by forming an adhesive layer and a resin layer at the outer surface of a metal pipe. The manufactured composite pipe is resistant to damage and the original form of the cross-sectional surface of the composite pipe can be maintained even when wound into an annular shape. Peeling, buckling, etc. does not occur even when the complex pipe is returned to the form of a straight pipe for construction. Thus, the present invention enables the advantages of the significantly superior constructability and transportability of the product.
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