屋面钢结构焊接、吊装技术交底（Roof steel structure welding and lifting technical disclosure）

1、屋面钢结构焊接、吊装技术交底（Roof steel structure welding and lifting technical disclosure）Note of technical disclosure (form C2-2-1)numberT3-3OneConstruction name *1 - 3 block construction unit, Beijing * two steel structural branch companyMay 10, 2005Summary: roof steel structure welding technical disclosureDis

2、closure content: steel structure installation welding technical disclosureI. construction preparation:1. construction materials and machines:1) welding material: E4303. Storage: should be placed in a dry, well ventilated warehouse (room temperature not less than 18C0, relatively wet)It is less than

3、50%) and placed away from the ground and wall at least 300mm, so as to prevent moisture from deterioration. Drying: drying temperature is200 degrees, heat preservation 1-1.5 hours, after drying the electrode is best put into the storage box, so as to use with. WeldersThe welding rod is put in the he

4、at preservation barrel. Two times drying electrode temperature of 200 degrees, time is 1 hours, and do the welding rodDrying record. Welding rod approach must have certificate, according to instructions for baking. Prohibit the use of damp, skin peelingAnd the electrode welding core rust.2) machine:

5、 AC arc welding machine, oven, thermostat, grinding machine, heat preservation cylinder, goggles, angle grinder, wire brush,Small hammer, flat shovel and so onTwo, construction process1. welding current selection: Phi 3.2mm 100A130A Phi 4mm 160A210A;2. welding speed: about 15cm/min;3. assembly condi

6、tions: 100mm on both sides of weld seam, grease and rust should be cleaned up; weld gap is 6-8mm;4. welding, vertical welding and overhead welding using multi-layer single pass welding method, horizontal welding using multi pass welding method. The location of each laneHave a good grasp of it. The b

7、ottom bead of groove shall be welded by welding electrode of no more than 3.2mm, so as to facilitate welding penetration;5. welding in strict accordance with the welding sequence: first welding the upper main beam, welding the lower main beam; welding the middle layer main beam; finally, the steel c

8、olumn butt welding;Sequence of welding between 6. steel column and steel column:1) two welders in relative positions, isothermal and constant speed welding.2) when the symmetrical surface is applied to the 3-4 layer bead, the bead is cleaned and transferred to another position. Two, the opposite sid

9、e is welded and welded to 7-8When the weld line, and then back to the first equal position, constant speed, isothermal welding, cycle until the weld full7. the spot welding must be performed by the welder with the welders qualification certificate and the welding material used for the spot welding s

10、hall be in accordance with the material used for the official constructionSimilarly, the spot welding height shall not exceed the design weld thickness of 2/3, the spot welding length shall be greater than 40mm, and shall be filled with the crater, if foundSpot welding has holes and cracks and must

11、be removed.The person in charge of the technology is the person who is the receiverNote of technical disclosure (form C2-2-1)numberT3-3TwoConstruction name *1 - 3 block construction unit, Beijing * two steel structural branch companyMay 10, 2005Summary: roof steel structure welding technical disclos

12、ureDisclosure content:Three, quality requirements(I) guarantee items1. the grade and performance of the welding rod, the steel, steel plate and section steel used in the joint shall comply with the design requirements. Check the factory certificateElectrode baking record.2. welders must pass the exa

13、mination. Check welder qualification certificate and date of examination.3. steel structure requirements and base material equal strength welding seam must be inspected by flaw detection.(two) basic items1. the weld shall be checked after the weld has cooled to the point of operation;2. welding seam

14、 surface wave should be uniform, no cracks, slag, overip, burn, craters and pinhole defects such as weldingThere shall not be any spatter in the junction area;3. allowable error of weld size (unit: mm)Check the project item level two level three level test methodB 200.5 20.5 2.5 0.5 3.5 welding seam

15、More than high B = 200.5 30.5 3.5, 0.5 41DockingWeld lineThe wrong side of the weld and delta 0.1 0.1 2 0 to +3K = 0 +1.5TwoFilletWeld fillet angleWidth K 0 +3ThreeT type joint requires weldingPermeable type K weldK= Delta /2 0 +1.5Weld seamGage inspectionNote: B is the weld width, K is the weld ang

16、le dimension, and delta is the base metal thickness.The person in charge of the technology is the person who is the receiverNote of technical disclosure (form C2-2-1)numberT3-3ThreeConstruction name *1 - 3 block construction unit, Beijing * two steel structural branch companyMay 10, 2005Summary: roo

17、f steel structure welding technical disclosureDisclosure content:Four, civilized and safe construction1. to participate in the welding of steel structure welders, Xu Jingping, horizontal, vertical, inverted test, after obtaining a certificate of qualification in order to hold the post.2. after the w

18、ind speed exceeds 5, the welding shall be stopped.3. welders should wear personal protective articles when soldering, so as not to burn the skin with strong arc light. And the occurrence of electric ophthalmiaAnd scald caused by welding metal spatter.4., the welding site of flammable and explosive m

19、aterials to clean up.5. grounding of welding equipment and chassis must be good.6. welders should wear insulated gloves when they are pushed and pulled so as to avoid electric shock. The head is not just to prevent short circuitCause an arc spark to burn the face.7., if an electric shock accident, c

20、an not bare hand electric shock, should quickly cut off the power supply, rescue immediately.8. smoking is strictly forbidden at the scene, and alcohol is strictly forbidden.9. site construction personnel must strictly obey the management command.The person in charge of the technology is the person

21、who is the receiverNote of technical disclosure (form C2-2-1)numberT3-3FourConstruction name *1 - 3 block construction unit, Beijing * two steel structural branch companyMay 10, 2005Summary summary: roof steel structure hoisting construction technical disclosureDisclosure content:I. construction pre

22、paration:1. of construction materials and equipment: steel wire rope, iron wedge, Jack, cable, wire brush, polishing machine, tilting pad iron and steel,Theodolite, welding machine, E43 welding rod, wrench, total station, laser theodolite, level, level ruler, etc.2. steel column foundation inspectio

23、n:The plane position and elevation of steel column foundation is the foundation of high rise steel structure. Before the steel column is hoisted, the foundation bolt must be checkedCheck.Two, construction processIn order to control the error of the overall size of the steel beam, as well as the symm

24、etry and the whole in the process of the plane installation of the high-rise steel structureStability. The installation sequence of steel beams and steel columns should be extended around the center. This project 3#, 4# building two big work area sameIn order to increase the utilization ratio of tow

25、er crane, two working classes should be set aside to find the right and auxiliary labor time.1. lifting and welding sequence:The structure is assembled from the inside to the outside, and the position of the control center is first carried out welding, and then the welding is carried out to the circ

26、umference.(1) there are two layers of steel columns connected steel beam, beam welding joints should be welded again, beam connections.(2) the root steel column has three layers; when the steel beam is connected, the welding sequence is as follows: firstly welding the upper, the lower and the middle

27、 joint;Weld seam of post welding steel column interface.2. hoisting of steel column(1) the steel column shall be cleaned before the lifting of the column; the central line shall be ejected and the datum mark shall be marked well. Inspection columnFoot center line, hole spacing and hole between the d

28、iagonal and column bolt coincide. In case of deviation, repair shall be carried out before liftingTo ensure the successful lifting of steel posts.(2) in order to facilitate the operation of the next process, the ladder and operation platform should be welded together.(3) correcting the steel column:

29、 vertical and elevation measurements are made on the left and right axes (corrected by oblique iron). If the column axis appearsError, Jack, chain, iron wedge is adjusted to be available; the wedges elevation adjust tolerances. When the axis of the steel column planeThe location and elevation adjust

30、ment to meet the design requirements, the anchor bolts, the iron and steel column base plate welded pad.The person in charge of the technology is the person who is the receiverT3-3Note of technical disclosure (form C2-2-1)numberFiveConstruction name *1 - 3 block construction unit, Beijing * two stee

31、l structural branch companyMay 10, 2005Summary summary: roof steel structure hoisting construction technical disclosureDisclosure content:(4) temporary fixing of columns: the underground part is adjusted and fixed by cables; the 113 steel on the ground is made of 1/2The wire rope is adjusted and fix

32、ed to prevent the verticality of the column from changing.Attention should be paid to the verticality of the vertical column and side column in the elevator shaft, and the vertical of the adjacent steel column shall be monitored in time for the installation of the main beamDegree.TwoWhole structure

33、re calibrationWhen the whole column and column beam are all hoisted, a calibration, calibration and check shall be carried out to ensure that the design meets the requirementsThe welding area shall be welded only after the specification has been made.Three, quality standardsThe hoisting of steel str

34、ucture must be strictly carried out according to the design and specifications, and the accuracy must be achievedThe 1. main projects: (a component of the number of checks 10%, and less than 3)Check item tolerance memoAt the bottom of the column on the bottom axis positioning axis offset 3 of the to

35、tal station instrument rulerThe 1 axis positioning of total station, the rulerH/1000 single Jiezhu verticality, and less than 10 of total station, the rulerThe verticality of main structure (H/2500+10.0) and less than 50 of total station, the rulerThe whole plane bending of the main structure of the

36、 L/1500, and less than 25 of total station, the rulerTwoGeneral project: (a component of the number of checks 10%, and less than 3)The center line and the elevation datum mark of important components such as steel column should be complete. Installation inspection quantity: according to similar comp

37、onentsOr check the number of nodes 10%. Among them, the column and beam shall be no less than 3 pieces, and the main beam and the secondary beam shall not be less than 3 joints.Check itemThe upper and lower posts at the junction of the wrong mouthThe top of the same layer height differenceHeight difference between the ends of the same beam at the top of the same beamAllowable deviationThreeFiveL/1000, and less than 10RemarksS