1X330火力发电站烟囱钢内筒施工方案(英文).doc

3.5 Construction Statements for the Steel Liners Erection3.5.1 Preparation at the construction site: The embedded items will be installed along with the rising construction platform, complying severely with the requirements of the drawing (see the drawing).3.5.1.1 After the steel formworks have been promoted, the platform will be applied to carry on the installation of elevator bearers and wires, hanging the steel wires for elevating circular platform, conducting the reinforcement of pulleys through the application of the elevator in the center, and installing of limit device and suspension loops and so forth.3.5.1.2 In prior to the removal of promote platform, the 193m platform will be installed through the application of the jumpform of construction platform. After that, a 2t winch will be lifted to the platform in a appropriate distance of 3-4m to the elevator as the fixing position. The 193m platform will also be utilized to install the 180m platform. And similarly it comes to the 140m one.3.5.1.3 After the promote platform removed, the distribution of cables will be conducted by the utilization of human-and-cargo elevator and cage, as well as installing, fixing and debugging for the winch. Meanwhile carry on the installation and welding of suspension points, and steel wire hanging at the 140m platform.3.5.1.4 Before the steel liners have been hoisted, a railway rolling chute will be laid in the midst of the preformed hole at the bottom of chimney stack, on which a manpowered vechicle was installed to take the steel liners in place and carry out the upset transportation from the storage yard to the erection position.3.5.1.5 The winch on the promote platform will be employed to fix the welder, winch, and the side basket as the vertical tranporting tools for platform and hydraulic lifting equipments. And in ahead of lowing-down, the installation and welding of lateral bearer, bearers of suspension points and elevator, and guide pulleys on the top must be completed and in preparation.3.5.1.6 The leveling, setting out and embedded items of the pedestal of steel liner should be examined and kept with records to prepare for the febrication and installation.3.5.1.7 Preparation for hydraulic lifting equipment: it must be tested and in preparation. There will be one 5t two-tube winch, one 5t winch, one 2t winch, two 3t winches installed and in preparation. The human-and-cargo elevator can be available after it has been debugged and tested with its net load. 3.5.2 Operational ProcedureThe six layers of platforms, straightened ladders, winding stairs, components and embedded items will be manufactured in advance as well as the steel flues will also be febricated at site. The fabrication process is: raw material accessing to the yardverifying the specification and certification of materialcarrying out the stretching , bending, percussion and welding testtemplate-makingfabrication & preparation on the materialalignment of componentsbeing compressed into formationcombination and jointinginspection on the processweldingexamination and alignment for deformational partsmaking holesself-inspection and specilized examinationcleaning up the footing coarse of metaldust removel, oil-painting and corrosion protectionpiling-up and numbering of semi-manufactured products.With the template-making, the sample plates and items must be made, complying with the right shape and dimension and a proportion of 1:1 indicated on the work drawing, and being coodinated with relevant clamping fixture. Only after the sample plate has been to transmit to the technical staff and inspector and given by permittion, it can be carried out with its febrication, of which the drawing number, names of components, certification and specification of material must be signed. And preserve enough amount according to different processing measures. For the large sheet material, its geometry dimension, side length and diagonal lines must be controlled and verified, as well as accumulated error considered for the item consists of multiple components. Both corrosion protection of final product members and footing course treatment need be in accordance with design and specifications, and make sure the adhensive strength between the membrane and primer. And the painting thickness and layers must be controlled stricktly as well as the material diluted comply with the mixing proportion. The storage yard for steel members must be flat and with no contamination and accumulated water, and the workpieces must be supported firmly with no displacement or sedimentation permitted. Numbering must be conducted, and give clear indication of the setting-out line and center line at the same time. For those special ones , their schematic points , names and elevation should be symblolized to facilitate for the verification and transportation. 3.5.2.1 Manufacture of steel platform, windingstairs, restraining points a