大跨度门式刚架结构吊装工法（Hoisting method of large span portal frame structure）

1、大跨度门式刚架结构吊装工法（Hoisting method of large span portal frame structure）Hoisting method of large span portal frame structure(JSGF14-2001)1. Scope of applicationThe construction method is suitable for the erection of assembled double hinged reinforced concrete portal frame structure, such as different spa

2、n can be adjusted by bracket height, steel wire rope, clamping ring and lifting machinery can also be applied to the construction method.2. Construction preparation2.1 familiar goes, learning standard, master portal frame hoisting requirement.2.2, calculate the height of the bracket, before the appr

3、oach to the erection of the bracket leveling, maintain the same level and prefabricated parts of the site, avoid the stent position.2.3 on site conditions, namely the cup bottom level, flatness, smoothness and bracket position, axis, prefabricated frame column length, node structure of itemized acce

4、ptance inspection site, precast concrete strength, establish the corresponding construction programs.2.4 make technical and safety disclosure according to design requirements, quality standards, specifications and regulations.2.5 careful analysis of the site conditions and rigid frame column, herrin

5、gbone beam production situation, the possible quality problems were analyzed, organize research, formulate preventive measures.3. Process flowCheck the bottom of the cup, cup and elevation elastic component installation, center line frame column and beam and plane displacement, Qimo frame column con

6、nections for hanging into the cup, to set up support, correction, symmetrical frame column verticality stopper into the cup to set up another bracket, plug, and verticality correction middle small, articulated beam hoisting installation welding.4. Key points of construction operationSelection of 4.1

7、 materials and making of special tools:4.1.1 frame column mould, steel wire rope with 6? 9 (phi 24.5), according to the position of the rings, in accordance with the straight after the frame column in a vertical tilt slightly to 2cm, as shown in Figure 1 the requirements of the production of special

8、 sling two, respectively for two rings on the column.4.1.2 cup oblique plug production: according to the cup size and the lower end of the column size to make the appropriate steel plug, such as Figure 2, weld 8mm.4.1.3 special bracket production: see Figure 3, weld 6mm.4.1.4 special oblique pad woo

9、d processing, see figure anchor preparation: the use of 2m long, 200 00mm? 4-8 square root buried cable position relatively deep 1.5m.Production of 4.1.6 cable wind rope clamp: see figure 5.The 4.2 frame column and beam Qimo before acceptance4.2.1 check the strength of the concrete before th

10、e start of the mould, whether the position of the hanging ring is offset or not.The geometrical dimension of the 4.2.2 inspection column and the beam, especially the two corresponding joint surfaces of the hinge point, meets the requirements of table 1.Table 1Item name checking item allowable deviat

11、ionMember length rigid frame + 2mmSectional dimension rigid frame + 5mmSide bent frame 2/1000Embedded position frame 5mm4.2.3 beam column should not be honeycomb, surface voids, broken off edge, lack of angle.4.3 beam Zhuqi mode and displacement.4.3.1 beam Zhuqi mode operation: frame column m

12、old using two jack card ring respectively in the two column rings, clamp clasp screw up from time to time, so as not to end up squeezing rod column edge damage. the center of the hook should be on the vertical surface of the hanging ring of the component, and the angle between the steel rope

13、and the plane of the component is not less than 90 degrees. mold the crane slowly lifted, to prevent the components and the underlying local bond, such as a local bond, with a flat zaozao in bonded joint. mode use the same square at three points, namely, rigid frame column column canti

14、lever pad.4.3.2 ensure the beam quality measures Zhuqi modeThe strength of the die shall not be less than 75% of the design strength. contact with the rope parts with 100? 00 wooden wheel and tire package, to prevent the local pressure is too large, the beam column corner injury.Displ

15、acement of 4.3.3 beam column.If the column is out of the service range of the crane, the component shall be transferred to the cranes spoke, and the crane is lifted by two cranes,In the column, column by bundling setting suitable lifting point shifted to the phase position still 3 points in

16、the pad, the installation of wind cable clamps and installed on the cable wind rope for hanging X. beam Qimo should stand on the ground, both sides use square brace, while on the top of the beam to column in the installation of wind cable, correction after the installation of welding.Lifting

17、and installation of 4.4 componentsSelection of 4.4.1 crane:According to the frame column beam weight, length, site conditions, installation elevation, hoisting elevation, hoisting method (span or hoisting method) the reasonable selection of various factors, under normal circumstances, the choice of

18、two auto crane, a hoisting weight is mainly used for column and beam is larger, a plane shift and help the erection bracket, so are beneficial to the entire construction period and economic benefits.4.4.2 operation requirements: hoisting first pieces of rigid frame, if cable wind rope has no

19、place to stay, should consider the pre buried anchor. use special sling for the top two rings, the main crane hook lifting, micro cantilever column in upward tilt state, into the cup, with a steel plug alignment cup Moxian temporary fixation. use the auxiliary crane hanging bracket und

20、er the cantilever column, and 3 tons of steel wire rope hoist inclined bracket in the horizontal axis direction will support in the column, until the oblique timbers and cantilever bottom plane, the bottom surface of the bracket pad. slowly hook the main crane to the slight stress state of th

21、e wire rope.The top two sides adjustment wind cable vertical shaft to. adjust the two cables on both sides of the cantilever to the hinge joint center to control on the axis. (using theodolite or hanging wire hammer method) main crane slowly fall hook to loosen the wire rope, r

22、e inspect two direction transverse to ensure verticality within 5mm, and 1cm in the longitudinal control of camber, plugged steel plug.Hoisting another rigid frame column by . installation of intermediate miter beam.When the 0 herringbone beam is in place, the inclined pads on t

23、he two supports are knocked to the middle of the midspan for two, and the contact points are equal and the verticality is corrected.1 4 welders were symmetrically welded at the two upper contacts, and pay attention to observe the transverse verticality changes, adjust the welding program.4.4.

24、2.12 two contact welding fixed after decoupling, the two upper hoist will loosen skids to mid span can be removed under the mobile bracket of a rigid frame installation, check and correct cup filling.5. Construction machineryNumber of machines name unit number using partsHoisting of 1 lifting dies f

25、or 1 30T truck crane2 16T car crane 1 component translation, support the demolition of an emergency3 welding platform 4 installation welding4 support sleeve 2 support rigid frame column5 cable wind fixture 8 cable wind ropeHoisting of 6 steel wire rope root 6 x 19 mm 24.54 rigid frame column beamWin

26、d correction of 76 x 19 mm 9.332 cable8 theodolite Table 2 measuring verticality99 clamping ring only 4 column hoistingHoisting of 104.9 clamping rings with only 4 beams111.4 clip ring only 40 cable wind125 tons of gourd only 2 correction column133 tons of gourd only 2 correction6. Labor Organizatio

27、n6.1, skilled workers should be selected for on-site operation, all types of work should be closely coordinated with each other, unified command of construction personnel, obey the command.6.2 command 1 people at high altitude, 2 technicians, 4 welders, 6 crane and 3 crane drivers.7, ensure safety m

28、easures7.1 around the hoisting site, temporary railings should be set up, clear signs should be hung, and non staff members should be prohibited.7.2 the workers work at high altitude and set up temporary operating platform.7.3 equipped with suspended reclining ladder, for people to go up and down.7.

29、4 if you need to walk on the suspended roof truss, set up safety railing on it.7.5, when there are more than six class strong winds and thunderstorms, aerial work may not be carried out, must be appropriate to take appropriate safety measures.7.6 strictly according to the safety operation procedures, wearing helmets, aerial work must be safety belts.8, quality assurance measures8.1 the center line of the rigid frame should be accurate, and make the center