- blast furnace foundation construction:
(1) According to the central radiation line of the flange at the top of the blast furnace, draw the circular masonry reference line of the furnace foundation on the furnace foundation concrete.
(2) Lay a layer of rigid plastic mortar conforming to the design thickness, and then start building blast furnace refractory fire bricks according to the datum line.
(3) After laying three layers of clay bricks, carry out the construction of carbon ramming materials, and then work alternately to the foundation pier surface.
(4) After masonry to the foundation pier surface of blast furnace, bind the reinforcement, and then pour the refractory concrete layer after verification.
- construction of water cooling pipe at the bottom of blast furnace:
(1) A layer of rigid plastic mortar conforming to the design thickness shall be laid on the upper surface of the foundation pier surface, and then the construction of heavy coating shall be carried out at the center line of the water cooling pipe.
(2) After the spraying is completed and the inspection is qualified, the operation of carbon ramming material shall be started, and the construction shall reach the horizontal elevation of the top surface of I-beam.
(3) After the construction of carbon ramming materials is completed and checked to be qualified, the installation and welding of furnace bottom sealing plate shall be started.
- Pressure grouting of blast furnace bottom plate:
(1) After the installation of the furnace bottom sealing plate is completed and the inspection is qualified, the grouting short pipe shall be welded at the reserved grouting hole of the furnace bottom sealing plate, and then the furnace bottom pressure operation shall be carried out.
(2) After the pressure grouting is completed and the construction quality is qualified, the installation and welding of the control grid can be carried out.
- Blast furnace bottom leveling construction:
(1) Check and measure the installed control grid. After confirming that it is correct, clean the furnace bottom and start the tamping operation of carbon tamping materials in layers.
(2) The carbonaceous ramming material shall be gradually carried out from the center to both sides. During the construction of the last layer of ramming material, scrape out the surface of the ramming material dressing layer with a scraper, and the horizontal elevation shall be about 3 ~ 5mm higher than the top surface of the flat steel, and then level with a shovel scraper. The square method is consistent with the ramming material construction at the water cooling pipe.
- Pointing of blast furnace cooling stave (plate):
(1) The matching specification and size of pointing and sealing iron sheet shall be determined according to the size and length of mortar joint.
(2) Seal the iron sheet tightly on the back of the cooling stave, tighten it with iron wire and bamboo stick and fix it on the front of the cooling stave.
(3) Pointing shall be carried out layer by layer and section by section from top to bottom and from inside to outside. Vertical joints shall be filled from top to bottom and circumferential joints shall be filled from inside to outside.
- Carbon brick masonry of blast furnace bottom:
(1) check and confirm the center line projected on the cooling stave, and mark the masonry center line by rotating 38 ° clockwise according to the center point of the blast furnace.
(2) The supporting carbon blocks shall be pre laid and laid dry, and the joints shall be inspected to be qualified, and then they can be built only after they are fixed with wood support.
(3) Use the crane to lift the central carbon block above the central point of the blast furnace, and then lower it slowly. In the process, constantly adjust the position of the carbon block to make it coincide with the upper and lower center lines and the masonry center line of the furnace bottom, and fix it in place.
(4) Use the same method to fix the carbon blocks on both sides of the central column at the specified position.
(5) Stagger and re draw the line from half of the center line of the central row of carbon blocks to make it coincide with the edge lines of the three carbon blocks, that is, the masonry edge line of the central row of carbon blocks.
(6) According to the masonry sideline, the second row of carbon blocks on one side shall be pre laid dry according to the design and construction requirements, and the joints shall be checked and confirmed to be correct, and then the support frame between this row of carbon blocks and the supporting carbon blocks shall be firmly supported.
(7) Take the second row of carbon blocks as the guide surface to build the central row of carbon blocks, and the masonry sequence shall be carried out from the center to both sides one by one.
(8) When the central row of carbon blocks is built to about five blocks, the jack shall be used to simultaneously force and tighten from both ends until the vertical joint meets the design allowable error. Both ends of the jack shall be uniform and stable to ensure that there is no dislocation or displacement of the carbon blocks, and the other two sides of each row of carbon blocks also need to be tightened.
(9) When the carbon bricks are laid in four rows according to the masonry requirements, the middle support frame can be removed and masonry can be carried out from both sides simultaneously.
(10) After the whole layer of carbon block masonry is completed, lay a layer of rubber with a certain thickness, and start the construction of surrounding carbon tamping materials layer by layer and section by section.
(11) Before the construction of surrounding carbonaceous ramming materials, the wooden wedges in the expansion joint shall be removed in turn, and the sundries in the joint shall be cleaned up.
(12) After the construction of ramming materials is completed, the furnace shall be cleaned and checked to be qualified, and then the construction of the upper layer of carbon ramming materials shall be carried out. The center lines of the upper and lower layers shall be rotated by 30 °.