CN111851987A - Construction method of attached short-limb I-steel flower basket pull rod knot type cantilever frame - Google Patents
Construction method of attached short-limb I-steel flower basket pull rod knot type cantilever frame Download PDFInfo
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- CN111851987A CN111851987A CN202010892325.0A CN202010892325A CN111851987A CN 111851987 A CN111851987 A CN 111851987A CN 202010892325 A CN202010892325 A CN 202010892325A CN 111851987 A CN111851987 A CN 111851987A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 172
- 239000010959 steel Substances 0.000 title claims abstract description 172
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 238000003466 welding Methods 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000003754 machining Methods 0.000 claims abstract description 5
- 230000007547 defect Effects 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims description 20
- 238000005520 cutting process Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 230000008520 organization Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/007—Devices and methods for erecting scaffolds, e.g. automatic scaffold erectors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
- E04G5/046—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on walls
Abstract
The invention discloses a construction method of an attached short-limb I-steel flower basket pull rod knot type cantilever frame, which specifically comprises the following steps: the method comprises the following steps: setting up preparation work; step two: manufacturing the cantilever frame body material: the method comprises the steps of blanking and welding of a steel plate at the end part of an I-shaped steel, machining of a turn buckle and manufacturing and welding of a pull rod; step three: inspecting the material of the cantilever frame body: checking the model, specification, quantity, component appearance and connecting plate defects of the cantilever frame accessory, bolt holes and bolts, and filling in a check list; step four: embedding a sleeve in the wall body ring beam; step five: mounting an overhanging I-shaped steel cantilever beam; step six: and (5) installing a basket diagonal draw bar. The invention has the technical effects that the integral frame body support forms a triangular stress stabilizing system; the steel consumption is reduced, the cost is reduced, and energy conservation and emission reduction are realized; the quality of water seepage of the hole is reduced; short construction period, convenient operation, simple assembly and disassembly, safety and reliability.
Description
Technical Field
The invention relates to the technical field of cantilever frame construction processes, in particular to a construction method of an attached short-limb I-steel flower basket pull rod knot type cantilever frame.
Background
In recent years, with the rapid development of the building industry in China, high-rise and super high-rise buildings are continuously increased, the construction environment is more and more complex, and in order to meet the requirements of structural construction and external decoration construction, the application forms the construction method of the attached short-limb I-steel basket pull rod pull-knot type cantilever frame by deeply researching the external scaffold of the cantilever type steel pipe fastener, optimizes the I-steel complex process for placing the previous cantilever scaffold, saves the materials of the I-steel, and brings convenience to decoration construction. The method has the characteristics of wide adaptability, strong bearing capacity, convenience in erection and disassembly and the like, and has obvious guiding significance for similar projects.
Disclosure of Invention
The invention aims to provide a construction method of an attached short-limb I-steel flower basket pull rod knot type cantilever frame, so as to achieve the technical effects provided in the background technology.
In order to realize the purpose, the invention provides the following technical scheme: an attached short-limb I-steel flower basket pull rod knot type cantilever frame construction method specifically comprises the following steps:
the method comprises the following steps: setting up preparation work: familiar with engineering building structure construction drawings, compiling cantilever frames and scaffold construction organization designs, determining the segmental height of the scaffolds according to the construction drawings, determining the longitudinal distance between the cantilever frames and the building, determining the use types of the cantilever frames, communicating with technical departments and coordinating when finding that the field conditions are inconsistent with the design types, modifying the design, and drawing a cantilever scaffold arrangement plan view and a profile view on the basis to serve as one of construction organization contents;
step two: manufacturing the cantilever frame body material: the method comprises the steps of blanking and welding of a steel plate at the end part of an I-shaped steel, machining of a turn buckle and manufacturing and welding of a pull rod;
wherein the blanking and the welding of I-steel tip steel sheet specifically include: mechanically drilling holes with the diameter phi of 24 holes and the hole pitch of 90mm by using a bench drill at a distance of 130mm from the lower side and 45mm from the side edge by using a 200X 180X 10mmQ235 medium-thickness steel plate at the end part of the I-shaped steel; cutting the I-steel according to the designed length size by gas cutting, fully welding C25 reinforcing steel bars on one side of the I-steel 100mm away from the front end of the I-steel, welding 100 x 10mmQ235 medium-thickness steel plates 100mm away from the welded reinforcing steel bar head, performing groove welding on the tail end of the I-steel by adopting 200 x 180 x 10mmQ235 medium-thickness steel plates and the I-steel, wherein the effective height of a welding line is 10mm, and the quality grade of the welding line is one grade;
the processing of turn buckle wherein specifically includes: taking a phi 50 x 80mm straight thread sleeve and internally penetrating a phi 18 screw to perform double-side welding with three 600mm long phi 14 steel bars, wherein the lap joint length is 80mm, the effective length of a welding line is 26mm, the quality grade of the welding line is one level, and the machined and molded turn buckle bolts are combined and installed into a positive tooth tool and a negative tooth tool;
the pull rod preparation and welding specifically include:
the upper pull rod of the common main beam adopts phi 18X 1500mm round steel and 250X 100X 10mmQ235 medium thick steel plates for groove welding, and the lower pull rod adopts phi 18X 1200mm round steel and 220X 100X 10mmQ235 medium thick steel plates for welding;
the upper pull rod of the lengthened main beam adopts round steel with the diameter of 18X 2500mm or 18X 2000mm to be welded with a middle thick steel plate with the diameter of 250X 100X 10mm Q235 in a bevel mode, and the lower pull rod adopts round steel with the diameter of 18X 1500mm to be welded with a middle thick steel plate with the diameter of 220X 100X 10mm Q235 in a bevel mode.
Step three: inspecting the material of the cantilever frame body: checking the model, specification, quantity, component appearance and connecting plate defects of the cantilever frame accessory, bolt holes and bolts, and filling in a check list;
step four: embedding a sleeve in a wall ring beam: the method comprises the following specific steps:
firstly, after a top plate template is erected and before a beam outer mold is closed, accurately releasing a positioning line on the template surface according to a drawn scaffold I-steel plane layout drawing;
then, the upper end: embedding one sleeve with 25-x structural thickness at the corresponding position of the upper floor of the I-shaped steel cantilever, sealing two ends of the sleeve by using adhesive tapes, and welding the sleeve on a beam and a wall column; lower end: embedding a high-strength bolt sleeve before cantilever by adopting a phi 25-structure-thickness hollow galvanized steel pipe, sealing two ends by using adhesive tapes, and embedding the high-strength bolt sleeve into a steel bar binding beam and a wall column for welding and fixing;
finally, after the sleeve is pre-buried, a specially assigned person is assigned to recheck the plane arrangement size and the height position of the sleeve to ensure that the position deviation of the sleeve is reduced to the minimum, the specially assigned person is assigned to track the sleeve in the concrete pouring process, the position with the pre-buried sleeve is strictly forbidden to carry out blanking, and an operator is strictly forbidden to collide with the sleeve in the vibrating process;
step five: installing an overhanging I-steel cantilever beam: the method specifically comprises the following steps:
firstly, after the strength of concrete reaches C10, removing side molds of a beam, dredging an inner sleeve of an embedded beam, penetrating phi 25-structure-thickness high-strength bolts and gaskets from inside to outside through sleeve holes, sleeving the end parts of processed I-beams into two placed high-strength bolts, then respectively adding the gaskets on the bolts to match with two high-strength nuts, screwing the nuts by using a spanner, placing the I-beams at corners in a cross arm mode because the embedded bolts cannot be embedded and the angles are limited, and finally, after the strength of the concrete reaches C15, erecting a steel pipe fastener scaffold.
Step six: installing a basket diagonal draw bar: the method specifically comprises the following steps:
after the upper layer of concrete to be overhung reaches C10, a high-strength bolt gasket is penetrated out from a sleeve from inside to outside, an ear plate of an upper pull rod and the high-strength bolt are firmly fixed through a nut gasket, a lower pull rod and an ear plate on I-shaped steel are preliminarily fixed through an M20 high-strength bolt gasket, the upper pull rod is firmly fixed after extending into the upper pull rod, a basket bolt hole and a lower pull rod screw thread are in butt joint and continuously rotate, then the ear plate screw is loosened, the basket bolt extends into the upper pull rod screw thread and the lower pull rod screw thread to rotate, the exposed length of a screw rod is not less than 50mm, and finally, after the scaffold of the overhanging layer is erected, the overhanging layer is sealed by using an old template in time.
Preferably, the height standard of the scaffold sections determined in the step one is less than or equal to 20m in each section.
Preferably, the types of the cantilever used in the first step include a general type and an elongated type, wherein the general type is: the length of the I-steel is more than 1250mm at 1800 or more, wherein the length of the I-steel is as follows: the length of the I-steel is more than 1800mm and is more than 3000.
Preferably, when the round steel and the medium steel plate of the upper pull rod of the common main beam and the upper pull rod of the lengthened main beam in the step two are subjected to groove welding, the bending degree is 20 degrees, the punching aperture is phi 24mm, and the cutting groove distance is 100 x 20 mm; and step two, when the round steel of the common main beam lower pull rod and the lengthened main beam lower pull rod in the step two is subjected to groove welding with the medium steel plate, the hole diameter of the hole is phi 24 mm.
Preferably, the method also comprises the following steps: the pulling knot is pulled well, all dental appliances are protected by being wrapped by grease, and whether the turnbuckle is rusted or loosened is regularly checked.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame, the stress of a traditional I-steel cantilever beam is changed into the stress of a simple support end. The end part of the steel beam is fixed by a high-strength bolt, and the upper part of the overhanging end is screwed by a turn buckle to bear force. The integral support body support is a triangular stress stabilizing system.
2. The construction method of the attached type short-limb I-steel flower basket pull rod knot type cantilever frame changes the construction method of anchoring the traditional steel beam on the floor, changes the use of the steel cantilever beam and fixes the steel cantilever beam on the peripheral structure of a building through bolts, shortens the length of the cantilever steel beam, reduces the consumption of steel, reduces the cost, saves energy and reduces emission.
3. According to the construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame, the cantilever steel beam does not need to extend into a building, a hole does not need to be reserved in a wall surface, the wall surface does not need to be sealed and repaired again during construction, and the water seepage quality of the hole is reduced.
4. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame has the advantages that the construction of the terrace on the subsequent operation floor is not influenced, the terrace construction is not required to be carried out after the cantilever steel beam is dismantled, and the construction period is shortened.
5. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame is convenient to operate, simple to install and disassemble, safe and reliable.
Drawings
FIG. 1 is a schematic structural diagram of an I-steel base in an embodiment in front view;
FIG. 2 is a schematic side view of a common I-steel base and an elongated I-steel base in the embodiment;
FIG. 3 is a front view of the turn buckle assembly of the embodiment;
FIG. 4 is a side view of the turn buckle assembly of the embodiment;
FIG. 5 is a schematic view of a processing plane of the upper and lower tie bars in the embodiment;
FIG. 6 is a schematic view of a sleeve processing structure in the embodiment;
FIG. 7 is a schematic view of the installation of the angle I-beam in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: an attached short-limb I-steel flower basket pull rod knot type cantilever frame construction method specifically comprises the following steps:
the method comprises the following steps: setting up preparation work: familiar with engineering building structure construction drawings, compiling cantilever frames and scaffold construction organization designs, determining the segmental height of the scaffolds according to the construction drawings, determining the longitudinal distance between the cantilever frames and the building, determining the use types of the cantilever frames, communicating with technical departments and coordinating when finding that the field conditions are inconsistent with the design types, modifying the design, and drawing a cantilever scaffold arrangement plan view and a profile view on the basis to serve as one of construction organization contents;
step two: manufacturing the cantilever frame body material: the method comprises the steps of blanking and welding of a steel plate at the end part of an I-shaped steel, machining of a turn buckle and manufacturing and welding of a pull rod;
wherein the blanking and the welding of I-steel tip steel sheet specifically include: mechanically drilling 12 holes in the end steel plate of the I-shaped steel 14, which is a 200X 180X 10mm Q235 medium-thickness steel plate 11, at a distance of 130mm from the lower side and 45mm from the side edge by using a bench drill, wherein the diameter of each hole is phi 24, and the hole distance is 90 mm; cutting the I-steel 14 by gas cutting according to the designed length dimension, fully welding a C25 reinforcing steel bar 15 on one side 100mm away from the front end of the I-steel 14, welding a 100 x 10mmQ235 medium thick steel plate 100mm away from the welding reinforcing steel bar head, performing groove welding on the tail end of the steel I-steel 13 by adopting a 200 x 180 x 10mmQ235 medium thick steel plate 11, wherein the effective height of a welding line is 10mm, and the quality grade of the welding line is one level; the i-steel 14 and the medium steel plate form an i-steel base, wherein the i-steel base is as shown in fig. 1 and 2, and the i-steel base comprises a common i-steel base and an elongated i-steel base.
As shown in fig. 3 and 4, the machining of the turn buckle specifically includes: taking a phi 50 x 80mm straight thread sleeve 17 and a phi 18 screw rod 18 penetrating through the sleeve to perform double-side welding with three 600mm phi 14 steel bars 16, wherein the lapping length is 80mm, the effective length of a welding line is 26mm, the quality grade of the welding line is one level, and the machined and formed turnbuckle is combined and installed into a positive and negative tooth tool;
as shown in fig. 5, the manufacturing and welding of the tie rod specifically includes:
the upper pull rod of the common main beam adopts phi 18X 1500mm round steel to perform groove welding with 250X 100X 10mm Q235 medium thick steel plates 19, and the lower pull rod adopts phi 18X 1200mm round steel to perform groove welding with 220X 100X 10mm Q235 medium thick steel plates 20;
the upper pull rod of the lengthened main beam is subjected to groove welding by round steel with the diameter of 18 × 2500mm or 18 × 2000mm and a middle thick steel plate 19 of 250 × 100 × 10mmQ235, and the lower pull rod is subjected to groove welding by round steel with the diameter of 18 × 1500mm and a middle thick steel plate 20 of 220 × 100 × 10mmQ 235.
Step three: inspecting the material of the cantilever frame body: checking the model, specification, quantity, component appearance and connecting plate defects of the cantilever frame accessory, bolt holes and bolts, and filling in a check list;
step four: embedding a sleeve in a wall ring beam: the method comprises the following specific steps:
firstly, after a top plate template is erected and before a beam outer mold is closed, accurately releasing a positioning line on the template surface according to a drawn scaffold I-steel plane layout drawing;
as shown in fig. 6, then, upper end: embedding one sleeve with 25-x structural thickness at the corresponding position of the upper floor of the I-shaped steel cantilever, sealing two ends of the sleeve by using adhesive tapes, and welding the sleeve on a beam and a wall column; lower end: embedding a high-strength bolt sleeve before cantilever by adopting a phi 25-structure-thickness hollow galvanized steel pipe 22, sealing two ends by using adhesive tapes, and embedding the steel pipes into a steel bar binding beam and a wall column for welding and fixing;
finally, after the sleeve is pre-buried, a specially assigned person is assigned to recheck the plane arrangement size and the height position of the sleeve to ensure that the position deviation of the sleeve is reduced to the minimum, the specially assigned person is assigned to track the sleeve in the concrete pouring process, the position with the pre-buried sleeve is strictly forbidden to carry out blanking, and an operator is strictly forbidden to collide with the sleeve in the vibrating process;
step five: installing an overhanging I-steel cantilever beam: the method specifically comprises the following steps:
as shown in fig. 7, after the strength of the concrete of the main structure 23 reaches C10, the side die of the beam is removed, the inner sleeve of the embedded beam is dredged, the high-strength bolt with the structure thickness of phi 25 x passes through the sleeve hole from inside to outside, the end of the processed overhanging i-steel 26 is sleeved into the two placed high-strength bolts, then the bolts are respectively provided with the gasket and are matched with two high-strength nuts, the nuts are screwed by a spanner, the i-steel at the corner is placed in a cross arm mode because the embedded bolts cannot be embedded and the angle is limited, and finally, after the strength of the concrete reaches C15, a steel pipe fastener scaffold is erected, wherein positioning piles 24 are arranged on the overhanging i-steel 26 and the cross arm i-steel 25, and the overhanging i-steel 26 and the cross arm i-steel 25 are fixedly connected through the steel plates 27 and the U-shaped anchor rings 28.
Step six: installing a basket diagonal draw bar: the method specifically comprises the following steps:
after the upper layer of concrete to be overhung reaches C10, a high-strength bolt gasket is penetrated out from a sleeve from inside to outside, an ear plate of an upper pull rod and the high-strength bolt are firmly fixed through a nut gasket, a lower pull rod and an ear plate on I-shaped steel are preliminarily fixed through an M20 high-strength bolt gasket, the upper pull rod is firmly fixed after extending into the upper pull rod, a basket bolt hole and a lower pull rod screw thread are in butt joint and continuously rotate, then the ear plate screw is loosened, the basket bolt extends into the upper pull rod screw thread and the lower pull rod screw thread to rotate, the exposed length of a screw rod is not less than 50mm, and finally, after the scaffold of the overhanging layer is erected, the overhanging layer is sealed by using an old template in time.
In this embodiment, the step one of determining the height standard of the scaffold section is that each section is less than or equal to 20 m.
In this embodiment, the types of the cantilever used in the first step include a general type and an elongated type, wherein the general type is: the length of the I-steel is more than 1250mm at 1800 or more, wherein the length of the I-steel is as follows: the length of the I-steel is more than 1800mm and is more than 3000.
In the embodiment, when the round steel of the upper pull rod of the common main beam and the upper pull rod of the lengthened main beam in the second step is subjected to groove welding with the medium steel plate, the bending degree is 20 degrees, the punching aperture is phi 24mm, and the cutting groove distance is 100 x 20 mm; and step two, when the round steel of the common main beam lower pull rod and the lengthened main beam lower pull rod in the step two is subjected to groove welding with the medium steel plate, the hole diameter of the hole is phi 24 mm.
In this embodiment, the method further includes the following maintenance: the pulling knot is pulled well, all dental appliances are protected by being wrapped by grease, and whether the turnbuckle is rusted or loosened is regularly checked.
The application cases are as follows:
case 1: residential building projects in the northern region of the original site of the Yangtze district in Xian city are positioned in the southern section of the Juque street in the Yangtai region, in the northern side of the latitude zero road, and have the building areas of 56877.05m2, 47499.14m2 on the ground and 9377.91m2 under the ground. The engineering and building engineering is of one-level grade, the seismic fortification intensity is 8 degrees, the foundation is a pile foundation cap and a raft foundation, and the main body is a frame-shear wall structure. The construction method of the attached short-limb I-steel flower basket drawknot type cantilever frame is used for the second layer above the ground, and the use effect is good.
Case 2: the Yuanhuan project of the Houzhou city is located in Xuzhou city of Jiangsu province, the West Zhujiang road is intersected with the south Huashan road, twenty-two to twenty-six floors are arranged on the ground, one floor (a garage and a basement of a main building) is arranged underground, 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 12#, and 13# ten high floors, and the total building area is 145534.94m2(ii) a In the shear wall structure, an attached short-limb I-steel flower basket pull-knot type cantilever frame construction method is used for six layers on the ground, and the using effect is good.
Firstly, the method comprises the following steps: checking and calculating the strength of the upper pull rod:
calculating the angle of the upper pull rod piece: α 1-arctanL 1/L2-arctan (2900/1150) -68.369 °;
upper tie member seating force:
design values: RS1 ═ nzR2 ═ 1 × 16.841 ═ 16.841 kN;
the design value of the axial force of the main beam is NSZ1 RS1/tan alpha 1 16.841/tan68.369 degree 6.678 kN;
axial force of upper pull rod:
design values: NS1 ═ γ 0RS1/sin α 1 ═ 1 × 16.841/sin68.369 ° -18.117 kN;
design value of maximum axial tension of the upper pull rod piece: NS max [ ns1.. NSi ] ═ 18.117 kN;
calculating the axial tension stability:
σ＝NS/A＝18.117×103/254.5＝71.187N/mm2≤f＝205N/mm2；
meets the requirements.
II, secondly: checking and calculating the turn buckle:
σ＝Ns/(π×de2/4)＝18.117×103/(π×162/4)＝90.108N/mm2≤[ft]＝170N/mm2；
meets the requirements.
Thirdly, the method comprises the following steps: calculating a lifting lug plate:
with reference to GB50017-2017, the following verifications were performed on the attachment lugs:
(1) the structural requirements of the ear plate are as follows: 2t +16 2 × 10+16, 36mm ≤ b, 40 mm; the requirements are met; 4 Be/3-4 x 36/3-48 mm ≤ a-60 mm; meets the requirements.
(2) And (3) checking and calculating the tensile strength of the clean section of the ear plate hole: calculating the width: b1 min (2t +16, b-d0/3) min (2 × 10+16, 40-24/3) 32 mm;
σ＝Ns/(2tb1)＝18.117×103/(2×10×32)＝28.308N/mm2≤f＝205N/mm2；
the tensile strength of the net section of the lug hole meets the requirement.
(3) Checking calculation of tensile (splitting) strength of section of end part of ear plate
σ ═ Ns/[2t (a-2d0/3) ] -18.117 × 103/[2 × 10 × (60-2 × 24/3) ] -20.588N/mm 2 ≦ f ═ 205N/mm 2; the tensile strength of the section of the end part of the ear plate meets the requirement.
(4) Checking and calculating the shear strength of the ear plate: width of shear section of end of ear plate:
Z＝[(a+d0/2)2-(d0/2)2]0.5＝[(60+24/2)2-(24/2)2]0.5＝70.993mm；
τ＝Ns/(2tZ)＝18.117×103/(2×10×70.993)＝12.76N/mm2≤fv＝125N/mm2；
the shear strength of the ear plate meets the requirement.
Checking calculation of connection anchor bolt of upper pull connecting plate and building
The upper pull rod 1: tension applied to the bolt connected with the building:
Nt1＝Ns1×sin(90-α1)＝18.117×sin(90°-68.369°)＝6.678kN；
shear force applied to the bolt connected with the building:
Nv1＝Ns1×cos(90-α1)＝18.117×cos(90°-68.369°)＝16.841kN；
tension values to which the individual bolts are subjected: nt1/n1 6.678/1 6.678 kN;
shear force values to which a single bolt is subjected: nv1/n1 16.841/1 16.841 kN; design value of shear-resisting bearing capacity of single high-strength bolt:
nvb ═ nv pi d2 effvb/4 ═ 1 × 3.142 × 17.652 × 250/(4 × 1000) ═ 61.167 kN; design value of tensile bearing capacity of each high-strength bolt: ntb ═ d2eftb/4 ═ 3.142 × 17.652 × 400/(4 × 1000) ═ 97.868 kN;
the bearing capacity of the bolt is equal to or less than 1 and meets the requirement of [ (NV/Nvb)2+ (Nt/Ntb)2]0.5 ═ 16.841/61.167)2+ (6.678/97.868)2]0.5 ═ 0.284.
Fifthly, checking and calculating the overall stability of the cantilever girder:
main beam axial force: n | [ ((-NSZ 1)) ] |/nz | [ (-6.678)) ] |/1 ═ 6.678 kN; strength of the press-bent member: σ max ═ γ 0[ Mmax/(γ W) + N/a ] ═ 1 × [2.964 × 106/(1.05 × 141 × 103) +6.678 × 103/2610] ≦ 22.58N/mm2 ≦ f ≦ 215N/mm 2; a coefficient of plastic development γ; meets the requirements.
And (3) analyzing the overall stability of the flexural member:
wherein
-the overall stability factor of the uniformly curved flexural member:
the steel structure design standard is obtained by looking up a table (GB50017-2017),
due to the fact that
More than 0.6, according to the attached table C of the design Standard of Steel Structure (GB50017-2017), obtaining
The value was 0.93.
Meets the requirements.
Sixthly, the method comprises the following steps: calculating the bearing capacity of the high-strength bolt:
it is assumed that each bolt bears equal tension and shear forces transmitted from the main beam.
V＝1×9.916＝9.916kN，N＝1×6.678＝6.678kN；
The shearing force value NV (V/n) borne by a single high-strength bolt is 9.916/2 (4.958 kN);
the tensile force value Nt of a single high-strength bolt is 6.678/2 is 3.339 kN;
design value of shear resistance and bearing capacity of single high-strength bolt
Nvb＝nvπd2efvb/4＝1×3.142×17.652×250/(4×1000)＝61.167kN；
Design value of tensile bearing capacity of each high-strength bolt
Ntb＝πd2eftib/4＝3.142×17.652×400/(4×1000)＝97.868kN；
The design value of bearing capacity Ncb is d multiplied by dt multiplied by fcb/1000 is 20 multiplied by 385/1000 is 154 kN;
[(NV/Nvb)2+(Nt/Ntb)2]0.5＝[(4.958/61.167)2+(3.339/97.868)2]0.5＝0.088≤1；
NV 4.958kN Ncb/1.2 154/1.2 128.333 kN; the bearing capacity meets the requirements.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame, the stress of a traditional I-steel cantilever beam is changed into the stress of a simple support end. The end part of the steel beam is fixed by a high-strength bolt, and the upper part of the overhanging end is screwed by a turn buckle to bear force. The integral support body support is a triangular stress stabilizing system.
2. The construction method of the attached type short-limb I-steel flower basket pull rod knot type cantilever frame changes the construction method of anchoring the traditional steel beam on the floor, changes the use of the steel cantilever beam and fixes the steel cantilever beam on the peripheral structure of a building through bolts, shortens the length of the cantilever steel beam, reduces the consumption of steel, reduces the cost, saves energy and reduces emission.
3. According to the construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame, the cantilever steel beam does not need to extend into a building, a hole does not need to be reserved in a wall surface, the wall surface does not need to be sealed and repaired again during construction, and the water seepage quality of the hole is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The pull rod knot type cantilever frame construction method of the attached short-limb I-shaped steel basket is characterized in that: the method specifically comprises the following steps:
the method comprises the following steps: setting up preparation work: familiar with engineering building structure construction drawings, compiling cantilever frames and scaffold construction organization designs, determining the segmental height of the scaffolds according to the construction drawings, determining the longitudinal distance between the cantilever frames and the building, determining the use types of the cantilever frames, communicating with technical departments and coordinating when finding that the field conditions are inconsistent with the design types, modifying the design, and drawing a cantilever scaffold arrangement plan view and a profile view on the basis to serve as one of construction organization contents;
step two: manufacturing the cantilever frame body material: the method comprises the steps of blanking and welding of a steel plate at the end part of an I-shaped steel, machining of a turn buckle and manufacturing and welding of a pull rod;
wherein the blanking and the welding of I-steel tip steel sheet specifically include: mechanically drilling holes with the diameter phi of 24 holes and the hole pitch of 90mm by using a bench drill at a distance of 130mm from the lower side and 45mm from the side edge by using a 200X 180X 10mmQ235 medium-thickness steel plate at the end part of the I-shaped steel; cutting the I-steel according to the designed length size by gas cutting, fully welding C25 reinforcing steel bars on one side of the I-steel 100mm away from the front end of the I-steel, welding 100 x 10mmQ235 medium-thickness steel plates 100mm away from the welded reinforcing steel bar head, performing groove welding on the tail end of the I-steel by adopting 200 x 180 x 10mmQ235 medium-thickness steel plates and the I-steel, wherein the effective height of a welding line is 10mm, and the quality grade of the welding line is one grade;
the processing of turn buckle wherein specifically includes: taking a phi 50 x 80mm straight thread sleeve and internally penetrating a phi 18 screw to perform double-side welding with three 600mm long phi 14 steel bars, wherein the lap joint length is 80mm, the effective length of a welding line is 26mm, the quality grade of the welding line is one level, and the machined flower basket bolts are combined and installed into a positive tooth tool and a negative tooth tool;
the pull rod preparation and welding specifically include:
the upper pull rod of the common main beam adopts phi 18X 1500mm round steel and 250X 100X 10mmQ235 medium thick steel plates for groove welding, and the lower pull rod adopts phi 18X 1200mm round steel and 220X 100X 10mmQ235 medium thick steel plates for welding;
the upper pull rod of the lengthened main beam adopts round steel with the diameter of 18X 2500mm or 18X 2000mm to perform groove welding with the middle thick steel plate of 250X 100X 10mmQ235, and the lower pull rod adopts round steel with the diameter of 18X 1500mm to perform groove welding with the middle thick steel plate of 220X 100X 10mmQ 235;
step three: inspecting the material of the cantilever frame body: checking the model, specification, quantity, component appearance and connecting plate defects of the cantilever frame accessory, bolt holes and bolts, and filling in a check list;
step four: embedding a sleeve in a wall ring beam: the method comprises the following specific steps:
firstly, after a top plate template is erected and before a beam outer mold is closed, accurately releasing a positioning line on the template surface according to a drawn scaffold I-steel plane layout drawing;
then, the upper end: embedding one sleeve with 25-x structural thickness at the corresponding position of the upper floor of the I-shaped steel cantilever, sealing two ends of the sleeve by using adhesive tapes, and welding the sleeve on a beam and a wall column; lower end: embedding a high-strength bolt sleeve before cantilever by adopting a phi 25-structure-thickness hollow galvanized steel pipe, sealing two ends by using adhesive tapes, and embedding the high-strength bolt sleeve into a steel bar binding beam and a wall column for welding and fixing;
finally, after the sleeve is pre-buried, a specially assigned person is assigned to recheck the plane arrangement size and the height position of the sleeve to ensure that the position deviation of the sleeve is reduced to the minimum, the specially assigned person is assigned to track the sleeve in the concrete pouring process, the position with the pre-buried sleeve is strictly forbidden to carry out blanking, and an operator is strictly forbidden to collide with the sleeve in the vibrating process;
step five: installing an overhanging I-steel cantilever beam: the method specifically comprises the following steps:
firstly, after the strength of concrete reaches C10, removing side molds of a beam, dredging an inner sleeve of an embedded beam, penetrating phi 25-structure-thickness high-strength bolts and gaskets from inside to outside through sleeve holes, sleeving the end parts of processed I-beams into two placed high-strength bolts, then respectively adding the gaskets on the bolts to match with two high-strength nuts, screwing the nuts by using a spanner, placing the I-beams at corners in a cross arm mode because the embedded bolts cannot be embedded and the angles are limited, and finally, after the strength of the concrete reaches C15, erecting a steel pipe fastener scaffold.
Step six: installing a basket diagonal draw bar: the method specifically comprises the following steps:
after the upper layer of concrete to be overhung reaches C10, a high-strength bolt gasket is penetrated out from a sleeve from inside to outside, an ear plate of an upper pull rod and the high-strength bolt are firmly fixed through a nut gasket, a lower pull rod and an ear plate on I-shaped steel are preliminarily fixed through an M20 high-strength bolt gasket, the upper pull rod is firmly fixed after extending into the upper pull rod, a basket bolt hole and a lower pull rod screw thread are in butt joint and continuously rotate, then the ear plate screw is loosened, the basket bolt extends into the upper pull rod screw thread and the lower pull rod screw thread to rotate, the exposed length of a screw rod is not less than 50mm, and finally, after the scaffold of the overhanging layer is erected, the overhanging layer is sealed by using an old template in time.
2. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame as claimed in claim 1, is characterized in that: in the step one, the standard of the height of each section of the scaffold is determined to be less than or equal to 20 m.
3. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame as claimed in claim 1, is characterized in that: the use types of the cantilever frame in the first step comprise a common type and an elongated type, wherein the common type comprises the following steps: the length of the I-steel is more than 1250mm at 1800 or more, wherein the length of the I-steel is as follows: the length of the I-steel is more than 1800mm and is more than 3000.
4. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame as claimed in claim 1, is characterized in that: when the round steel of the upper pull rod of the common main beam and the upper pull rod of the lengthened main beam in the step two is subjected to groove welding with the medium steel plate, the bending degree is 20 degrees, the punching aperture is phi 24mm, and the cutting groove distance is 100 x 20 mm; and step two, when the round steel of the common main beam lower pull rod and the lengthened main beam lower pull rod in the step two is subjected to groove welding with the medium steel plate, the hole diameter of the hole is phi 24 mm.
5. The construction method of the attached short-limb I-steel flower basket pull rod knot type cantilever frame as claimed in claim 1, is characterized in that: also includes the maintenance in the later period: the pulling knot is pulled well, all dental appliances are protected by being wrapped by grease, and whether the turnbuckle is rusted or loosened is regularly checked.
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