DOC-生料庫滑模施工方案E.doc

生料庫滑模施工方案EMethod statement for raw material silo. Project description1.0 Raw material silo：RCC silo, outside diameter is 23.472m.A cone starts at 8.693. Ring foundation is adopted. Concrete structure for the top. . References1.0 Drawings of raw meal homogenizing silo & kiln feeding system 2.0 The construction organization and design3.0 The relative construction codes and regulations. Main construction method1.0 Preparations1.1 Equipment: Mobilization and commissioning of tower crane, sliding devices, welder, etc, so as to ensure the slip form works in the normal way.1.2 Materials: Work out the plan of steel and carry out the fabrication work, prepare the plan of concrete and other materials.1.3 Job site: Smooth and straight so as to ensure the convenience of material transportation.1.4 Adequate manpowers.2.0 Silo wall slip form construction2.1Slip form constructiona. ConcreteThe concrete adopted for this job will be ready mixed concrete. The following data shall be noted in the plan sheet: pouring and vibrating time, pouring section, strength requirement, slumps and the quantity (cubic meters) intended to be poured and planned time of pouring. When slipform starts, the concrete shall be continuous, and the masons follows to vibarte. The concrete will be put into formworks and vibrated at the same time from both directions, so as to avoid the occurrence of slots or cracks caused by the already hardened concrete when only work to one direction. The proper slump requirement for slipform is 90-140mm.Concrete transportation: the concrete in the self-fabricated tipcart will betransported by the headframe to the sliding platform, and supplied to place of pouring by the tipcart.Vertical transportation: After calculation, the capacity of the tower crane meets the actual transportation demand. At the same time vertical transportation of the concrete should meet the demand for different section, Therefore, three headframe, which could goes up with the platform, is needed for silo wall sliding up, and self-fabricated tipcart, actually the capacity of the lorry is 0.18 cubic meters.Concrete pouring: when the silo wall is sliding up, put the concrete from the tipcart onto the platform between two slip form supports, masons shovel all the concrete on the platform into the formwork, masons following to vibrate the concrete. The concrete shall be continuously, and put into formworks and vibrated at the same time to both directions, so as to avoid the occurrence of slots or cracks caused by the already hardened concrete when only work in one direction.After put the concrete into the formwork, vibrate it in time with poker vibrator. The working principle is “quick insert and slowly pull out”, “one vibrator after another”, “vibrating in parallel”. For each point, the vibrating time is 20s-30s, the vibration could not be stopped only when the concrete surface does not go down obviously, and there is no air bubble comes out, and thick liquid occurs on the concrete surface. When vibrating the upper layer, the insert to the lower layer could not more than 5cm and connection joints between these two layers shall be eliminated. No vibration and over vibration is forbidden.When concrete is delivered, slump should be checked. The proper slump for slip form construction is 90-140mm.Records must be taken and kept for the strength test, and mark out the pouring section and strength etc. The concrete shall be crushed at 7 and 28 days. When results are satisfactory, the documents shall be kept in the archives. As for the disqualified cubes, the reasons have to be found outand actions for that batch have to be taken.b. ReinforcementThe vertical rebars lapping shall staggered at 1/4, and the overlapped area of ring horizontal rebars shall be no less than 50d. when the overlapping joints staggered distance is longer than 1000, then one rebar could be overlapped in the same area every four pieces. The rebars above the door and of the silo wall shall be bond when sliding up, the binding works shall be done with the concrete grouting one after the other.The concrete cover and position of the rebars are ensured to be correct by the clips installed in the horizontal beam of the slip form supports. c. sliding-upPreliminary sliding-up: when begin with silo wall grouting, the concrete shall be grouted in 3 layers into the formwork of 1200mm on both directions. Try to slide up the wall after 4 or 5 hours with 2 to 4 courses. Test the concrete out of the formwork with hand, when there is only a slight fingerprint and the concrete does not stick to the hand, then the normal sliding up procedure could be carried out after a short break.After completion of the soleplate construction, the above-mentioned method shall be taken for the grouting of upper silo wall.Attention:When start constructing silo wall above the soleplate, please pay attention to see whether the concrete strength of the soleplate meet sliding-up requirement because the sliding-up will start immediately after finish soleplate grouting works. If the concrete is not strong enough, the sliding-up speed shall be decreased.Normal sliding up: each time sliding up 30cm, the concrete shall be grouted circularly on both directions. It shall be lifted at an interval of1.5-2.0 hours, and when the temperature is high, it could be lifted 1-2 courses additionally.Whenever sliding up, correction works has to be done to avoid excursionand torsion, in case the deviation of the plummets for excursion and torsion controlling exceed 15mm (generally if any deviation occurs), correction works shall be done.Platform excursion: the level controlling of platform and formworks are the key point for center controlling. Before sliding up the formworks, the whole platform and the level of the jack must be checked and corrected by water level. The support shall be checked by water level as well, it shall be checked every other grouting.Deviation of the platform shall be corrected by inclining, lift the jack on the deviated side to a proper height and sliding up when the platform is inclined (no more than 1%), after the deviation has been corrected, continue with normal sliding procedure.Platform torsion: torsion of the platform shall be corrected by dragging, 8 points shall be selected evenly along the periphery and dragged by manual hoists to the opposite direction of the torsion, the torsion will be corrected when lift up the formwork.Attention:The poles must be reinforced when lifting up the platform without concrete. Stop sliding: when the sliding up must be stopped due to construction necessity or special cases, it shall be lifted up 1-2 courses at an interval of 0.5-1.0 hour, until the formwork and concrete do not stick together (around 4 hours), and it shall be lifted up 1 course the next day.Special record sheets have been taken for this job for technical controlling of every item, detailed information see attachment.d.Embedded parts and openings: on the sliding platform, nameplates shall be installed for all the embedded parts and openings and marked the code of embedded parts, size, and elevation data, and one person shall specially manage these nameplates.Attention:During construction there are much more iron parts and openings,therefore, the responsible person of the platform shall review and check the drawing and construction markings carefully to avoid any mistake.e. Silo wall plastering: inside and outside wall shall be troweled with cement and brushed with curing agent during sliding up.2.4 Items shall pay attention to2.4.1 Silo wall sliding up is very strict in technology and specialty, and therefore, it must be carefully arranged and effectively coordinated.All the items shall be managed specially by different person with clearly defined responsibility; everybody must work full-time without part-time job. According to the management system, the persons who in charged above and below the platforms are under the leadership of the chief management.The persons who in charged material supply, tests, concrete grading and dosing, concrete mixing, concrete horizontal transport, rebar classification and lifting, accommodation and medicine are under leadership of the one who is responsible for the items below the platform.The persons who in charged concrete vertical transport, rebar binding, concrete grouting and vibrating, platform leveling correction, prolonging of the supports, height control, surface treatment of the concrete after taking away the formworks, installation of embedded parts of each section are under the leadership of the person who is responsible for the items above the platform.2.4.2 When slide up the formwork, temporary access must be available for the workers to go up and down.2.4.3 During slip form construction, whenever sliding up, correction works has to be done for excursion and torsion, twice vertical correction has to be done per shift, 4 symmetrical points shall be selected for each section to measure the perpendicularity, and compared with the deviation of plummet for excursion and torsion.2.4.4 The allowed tolerances in slip form constructionVertical tolerance:Total height: 0.3% of the total height, no more than +/- 80mm Per 7.5m in height: +/- 50 mmSilo diameter tolerance:0.1% of the diameter of silo wall section, no more than +/- 25 mmSilo wall thicknessNo thicker than regulated thickness: 10mmNo thinner than regulated thickness: 5 mm.The slip form system shall be dismantled 2 days after the concrete grouting has been completed. The working principle is “dismantlement after assemble”, the operators must comply with all the instructions, well fasten the safety belt, dismantlement must be done in right sequence, and take use of tower crane. Technology and Safety1.0 Slip form mainly works high above the ground, and very dangerous. Therefore, the staff works for this job must enhance their knowledge and improve their safety consciousness and conception to accomplish the job successfully.2.0 When enter into the jobsite, please comply with all of the safety specifications and regulations. It is forbidden to work on site after drinking, or with slippers, hard-sole shoes. It is not permitted to fight and play on site.3.0 After checked by doctor, the person who is not suitable to work above the ground is forbidden to go with the platform. The staff who works above the ground is forbidden to throw anything to the ground, if it is necessary to transfer something, it must be transferred through headframe or tower crane. When transfer something, the operator must be within the platform handrails and well fasten the safety belt.4.0 The platform must be assembled with rigidity and stability; theoperators must check the stability and correct the platform at any time. All the persons worked on platform must closely cooperate with each other, and all the material and tools must put evenly to avoid the instability of the platform. Whenever push the trolley, convey material or tools, or dump the concrete, all of these must be done carefully and slightly.5.0 Actions must be taken to ensure and improve safety works, safety production plate and nameplate must be erected in the striking places. During slip form construction above the ground, safety area must be marked definitely by white lines to prevent the entering of the persons not belongs to the working group. The jobsite must be temporarily fenced and installed with electrical lighting for nighttime.6.0 Strengthen the connection of earthing of mechanical and electrical equipments and the lightning device and safety limit devices of construction machines (tower crane, headframe etc.).7.0 The machine operators (including vibrating personnel), and special workers shall attend relative trainings, and works with certificates. Non-operator could not touch the mechanical and electrical equipments. 8.0 Strengthen the lighting of works during night. It is forbidden to connect the wires randomly. Comply with the power regulations, the telegraph pole shall be wooden, it could not be dragged everywhere and hung on the headframe or contact with steel pipes.9.0 In order to prevent somebody fall down from high altitude, the four openings and the places nearby shall be equipped with protection advices. The slip form platform, headframe platform and scaffold, chute access shall be vertically and horizontally complete-closed with safety net.10.0 The key point of safety works on site is “five preventions”, more attention shall be paid to everybody, and the responsible personnel. Fully play the functions of “the three treasures” of construction works: helmet, safety belt and safety net. Whenever explain the technical requirements and design intension, the safety works shall be mentioned as well.11.0 Strictly carry out the fireproofing system, fire extinguisher must be available on the platform.12.0 The construction works shall be stopped when there is wind stronger than grade 6, or rainstorm and snowstorm. 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