CN114775993A - Construction method for overhanging structure high-support formwork buckling frame body - Google Patents
Construction method for overhanging structure high-support formwork buckling frame body Download PDFInfo
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- CN114775993A CN114775993A CN202210483130.XA CN202210483130A CN114775993A CN 114775993 A CN114775993 A CN 114775993A CN 202210483130 A CN202210483130 A CN 202210483130A CN 114775993 A CN114775993 A CN 114775993A
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- frame body
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- cantilever
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000009415 formwork Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 48
- 239000010959 steel Substances 0.000 claims description 48
- 238000003466 welding Methods 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000007665 sagging Methods 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 description 5
- 238000010408 sweeping Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- E04G5/045—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on profiles, e.g. I or H profiles
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to a construction method of a high-support formwork disc buckling frame body of an overhanging structure, belonging to the technical field of engineering construction.A disc buckling type scaffold is a novel portable support scaffold, has reliable bidirectional self-locking capability, does not have any movable part, and is convenient and rapid to transport, store, erect and dismantle; the bearing capacity is large, the building speed is high, and the adjustment can be freely realized; standardized packaging of products; the assembly is reasonable, and the safety and the stability are better than those of a door-type scaffold; the construction and deployment are reasonably carried out, the position of an embedded part is ensured to be accurate, the sagging deformation of the cantilever support system is reduced, the structural elevation of the cantilever part is ensured, and the smooth proceeding of the project is ensured.
Description
Technical Field
The invention relates to a construction method of a cantilever structure high-support formwork buckling frame body, and belongs to the technical field of engineering construction.
Background
Overhanging structures are one of the common structural forms in engineering structures, such as rain canopies, cornices, outer balconies, galleries, etc. in building engineering, and such structures are overhanging beams or plates from a main structure to form an overhanging structure, which is still a beam-plate structure in nature.
The project is a comprehensive building of a second hospital in Quyang county, with the building area of 31376.9m2The structure type is a frame shear wall; one underground floor, sixteen above ground floors and a total height of 69.9 m. The outer dimension of the building is 131.850 meters in total length and 36.775 meters in total width; the foundation type is beam raft foundation, the floor beam section size of encorbelmenting: cantilever beam 400x900 mm; boundary beam 400x800 mm; the frame beam 300x900mm has an overhang length of 5 m.
The project is a frame shear wall structure project, and the transmission requirements of the axis and the elevation are accurate; the structure length of encorbelmenting is big (5m), and apart from ground height (cantilever beam apart from ground 60m), and the template is established and is striden high (the height of setting up is 9.48m at the utmost), is erected a large amount, and reinforced concrete pouring volume is big, and the roof beam cross-sectional dimension is big (bxh is 400x900mm), and the safety in production problem is more outstanding.
The construction of the overhanging part of the project is assisted by a plurality of embedded parts, the overhanging length is large, how to reasonably construct and deploy and allocate resources such as manpower and material resources, and the like, and the key point of the project is to take the guarantee measures to ensure the accurate position of the embedded parts, reduce the sagging deformation of an overhanging support system, ensure the structural elevation of the overhanging part and ensure the smooth proceeding of the project.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a construction method of a disc buckling frame body of a high-support formwork of an overhanging structure.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a cantilever structure high-support formwork buckling frame body is characterized in that: comprises the following steps;
step one, embedding an I-shaped steel fixing snap ring according to a designed position.
And step two, processing and hoisting the cantilever I-steel in place.
And step three, embedding the lacing wire embedding piece.
And step five, correcting and adjusting the elevation position.
And step six, pre-checking and accepting.
And seventhly, placing a positioning line and paving a scaffold board.
And step eight, erecting a vertical rod.
Step nine, vertical and horizontal rods.
Step ten, setting a cross brace.
Step eleven, node setting.
And step twelve, elevation control.
And step thirteen, laying the main keel and the secondary keel.
Fourteen, paving the beam slab template.
And step fifteen, after the template is laid, measuring the elevation of the template by using a level gauge, and correcting.
Sixthly, applying a pre-pressing load and observing deformation.
Sixthly, checking and accepting.
The base is a 20# overhanging I-beam, a 100mm high phi 16 reinforcing steel bar fixing scaffold tube is welded on the I-beam at intervals of 1m, the first reinforcing steel bar is 500mm away from the side of a frame beam, 1250mm and 3250mm away from the outer end of the I-beam, pull rod stress supporting triangular prisms are respectively arranged below the I-beam, the peripheries of the triangular prisms are connected in a full welding mode, and each triangular prism is composed of three 12mm thick steel plates; a steel pipe baffle foot which is 200mm long and phi 48 is welded at the lower end of the I-steel and is 5250mm away from the outer end of the I-steel. The welding rod is E43 type, and the height of the welding seam is not less than 6 mm.
The template adopts a glued wood template with the thickness of 15 mm.
The invention has the beneficial effects that:
the disk buckle type scaffold is a novel portable supporting scaffold, has reliable bidirectional self-locking capability, does not have any movable part, and is convenient and quick to transport, store, set up and remove; the bearing capacity is large, the building speed is high, and the adjustment can be freely realized; standardized packaging of products; the assembly is reasonable, and the safety and the stability are better than those of a door type scaffold; the construction and deployment are reasonably carried out, the position of an embedded part is ensured to be accurate, the sagging deformation of the cantilever support system is reduced, the structural elevation of the cantilever part is ensured, and the smooth proceeding of the project is ensured.
Detailed Description
The technical solution of the present invention will be clearly and completely described below:
a construction method of a cantilever structure high-support template buckling frame body comprises the following steps;
step one, I-steel fixing snap rings are buried according to the designed positions and are made of phi 20 steel bars, two I-steel fixing snap rings are arranged for each I-steel, the first I-steel fixing snap ring is arranged in a frame beam, the distance between the second I-steel fixing snap ring and the edge of the beam is 3.6m, and concrete is anchored into each snap ring by 600 mm.
Step two, processing and hoisting overhanging I-beams in place, wherein the base is 20# overhanging I-beams, the interval between the I-beams is 1m, 100mm high phi 16 steel bar fixing scaffold tubes (the first steel bar is 500mm away from the frame beam edge) are welded on the I-beams, the positions 1250mm and 3250mm away from the outer ends of the I-beams are arranged, pull rod stress supporting triangular prisms are respectively arranged below the I-beams, the peripheries of the triangular prisms are connected in a full welding mode, and the triangular prisms are composed of three 12mm thick steel plates; a steel pipe blocking foot which is 200mm long and phi 48 is welded at the lower end of the I-steel at a position 5250mm away from the outer end of the I-steel, so that the I-steel is prevented from moving into a building under stress; welding reinforcing steel bar heads with the length of 100mm and the diameter of 16 mm on the I-shaped steel according to the detailed drawing requirement so as to support scaffold pipes. The welding rod is E43 type, and the height of the welding seam is not less than 6 mm.
Hoisting the processed I-steel tower crane to the position near the embedded ring, dispersedly placing, hoisting each I-steel into the embedded snap ring by using the tower crane, preliminarily taking a position, and fixing the I-steel firmly by using the wooden wedge.
And step three, embedding the lacing wire embedding piece, and placing 4 three-level phi 20 steel bars at the side face of the corresponding frame beam corresponding to the lower I-beam according to the design requirement of a drawing after the frame beam steel bars are bound.
And step four, processing and connecting the diagonal draw bars, and processing the diagonal draw bars. And (3) cutting and grinding the two ends of the diagonal-pulling steel bars to be flush according to the design calculation sizes of 4100mm and 5300mm, and performing threading according to the straight thread connection process requirement, wherein the deviation cannot exceed 2 threads.
Firstly, processing of the diagonal draw bars: and (3) cutting and grinding the two ends of the diagonal-pulling steel bars to be flush according to the design calculation sizes of 4100mm and 5300mm, and performing threading according to the straight thread connection process requirement, wherein the deviation cannot exceed 2 threads.
2.0m diagonal brace connection: connecting the inclined stay bars with the length of 4100mm in place, firstly installing nuts at the I-shaped steel, then installing straight thread sleeve joints at the upper frame beam, and screwing by using a torque wrench. After the diagonal braces on the two sides of each I-shaped steel are connected, nuts at the I-shaped steel are preliminarily fastened, and the balanced stress of the I-shaped steel is guaranteed.
Connecting the diagonal braces at the position of 4.0 m: and after finishing the installation of the diagonal braces at the positions 2.0m of all the I-shaped steel, installing the diagonal braces at the positions 4.0m according to the installation and connection sequence.
Fourthly, paving scaffold boards: the scaffold boards are laid in two steps, and before the diagonal braces at the position of 2.0m are connected, the scaffold boards are fully laid to the position 2.0m away from the frame beam; before the 4.0m diagonal braces are connected, the scaffold boards are fully paved to the position 4.0m away from the frame beams.
Fifthly, elevation position correction and adjustment: after the diagonal draw bars are installed, the distance between the connecting points is measured by a steel tape according to a frame beam control line, the front and rear positions of the I-shaped steel are finely adjusted, and the stress of the two nodes is ensured to be consistent with the design calculation; and measuring the elevations of the upper surfaces of all the I-beams by using a leveling instrument, ensuring that the I-beams are at the same horizontal elevation and the height of 4.0m is 20mm higher than that of the frame beam.
And step six, pre-checking and accepting. And checking the position and the elevation of the I-steel by field related technicians according to the scheme.
And seventhly, placing the positioning lines, paving scaffold boards, and placing the vertical rod positioning lines on the I-shaped steel according to the requirement of the vertical rod spacing layout of the scaffold. The scaffold boards are laid so as not to occupy the position of the vertical rod, the vertical rod can be guaranteed to be seated on the I-steel, the length of the scaffold boards is not less than 3m, and the thickness of the scaffold boards is not less than 50 mm.
Step eight, erecting upright rods, connecting the extension of the upright rods by using butt fasteners, wherein butt joints of two adjacent upright rods are not synchronous, the vertically staggered distance of the butt joints is not smaller than 500mm, and the center distance between each joint and the main node is not larger than 1/3 of the step distance.
Step nine, arranging floor sweeping rods at the bottoms of the vertical rods at a height which is not more than 200mm away from the ground along the longitudinal, transverse and horizontal directions in sequence from the longitudinal, lower and upper directions; a horizontal pull rod is arranged at the top end of the upright column at the bottom of the adjustable support along the longitudinal direction and the transverse direction; the horizontal rods are arranged between the two horizontal rods according to the equal division principle, and the distance is not more than 1.2 m. A horizontal pull rod is additionally arranged between two horizontal pull rods with the topmost step distance, namely the distance between the two horizontal pull rods at the topmost part is not more than 800mm, the end parts of all the horizontal pull rods are firmly propped against surrounding structural columns, and when no part can be propped, continuous cross braces are vertically arranged at the end parts and the middle parts of the horizontal pull rods.
Placing a longitudinal floor sweeping rod: the vertical rod is arranged on the inner side of the vertical rod and is fixed on the vertical rod which is not more than 200mm away from the base epithelium by a right-angle fastener, the length of the vertical rod is not suitable to be less than 3 spans, and the vertical rod are fixed in sequence from the corner.
The butt-joint fasteners of the longitudinal and transverse horizontal rods are arranged in a staggered mode, the joints of two adjacent longitudinal and transverse horizontal rods are not suitable to be arranged in a synchronous or same span, and the staggered distance is not smaller than 50 cm. The distance from the center of each joint to the nearest master node is preferably no greater than 1/3 for the longitudinal distance.
The steel pipe floor sweeping rod and the horizontal pull rod are in butt joint; the bridging adopts the overlap joint, and overlap joint length must be not less than 1000mm to adopt 3 rotatory fasteners to fix respectively in the department of being not less than 100mm from the rod end.
Step ten, setting the cross braces, namely arranging vertical continuous cross braces from bottom to top on the periphery of the outer side of the building, and arranging the vertical continuous cross braces along the length direction of the building, wherein the distance between every two adjacent cross braces is not more than 10 meters.
Eleventh, node setting: and at the positions of the outer sides and the middle of the periphery of the upright stanchions, frame columns are arranged, and each frame column is provided with a fixed joint with the frame body at every two steps according to the vertical height. The vertical rod extends for a length no greater than 500 mm.
And step twelve, elevation control, namely, a 50cm elevation control line is led to the vertical rod by using a level gauge, and the jackscrew at the upper part of the vertical rod is adjusted according to the bottom elevation of the plate designed by the drawing.
Step thirteen, paving main keels and secondary keels, wherein the main keels are steel pipes with the diameter phi of 48 x 3.0mm, the beam spacing is 500mm, and the plate spacing is 1000 mm; the secondary keel is 40 multiplied by 90mm, and the space between the wood beams is 200 mm.
And step fourteen, paving the beam slab template. After the supporting system is supported, the supporting system is sequentially arranged row by row from one side of the side span, firstly, the supporting system is paved from one side, the abutted seams are tight, and the self-adhesive tapes are adhered.
And step fifteen, after the template is laid, measuring the elevation of the template by using a level gauge, correcting and leveling by using a guiding ruler.
Sixthly, applying a pre-pressed load and observing deformation, wherein when the construction of the cantilever beam template is completed and before the steel bars are laid and bound, sand bags are uniformly placed on the template according to 70% of the calculated load, the load weight is increased by three times according to 30%, 50% and 70% of the calculated load, the middle interval is 30min, the deformation conditions of the cantilever system and the frame body supporting system are observed, and corresponding records are made; if no abnormal condition exists, when the load is loaded to 70% of the calculated load by weight and the load duration is 60min, continuously observing the deformation conditions of the cantilever system and the frame body supporting system and recording; the normal range is that the deformation of just sinking is no longer than 15mm without abnormal condition, thinks that the braced system bearing capacity of encorbelmenting can reach the design requirement, allows to carry out the construction next step. During unloading, the unloading is carried out in two stages (70% -50%, 50% -0) with an interval of 10 min.
Sixthly, checking and accepting, wherein after the frame body is erected, a unit sends a special person to check and accept, the check and acceptance is qualified, the next procedure can be performed for construction, the project to be checked is that the bottom of the vertical rod is flat and is seated on the I-shaped steel. The backing plate should meet the design requirements. The extension length of the jacking screw rod is in accordance with the specification. The gap at the joint of the jacking and the steel pipe is required to be compacted. The specification size and the verticality of the vertical rod meet the requirements, and eccentric load cannot occur. The arrangement of the floor sweeping rod, the horizontal pull rod, the cross brace, the pulling piece and the like accords with the regulations and is reliable in fixation. Various safety features should be satisfactory.
Claims (3)
1. A construction method of a cantilever structure high-support formwork buckling frame body is characterized in that: comprises the following steps;
step one, embedding an I-shaped steel fixing snap ring according to a design position.
And step two, processing and hoisting the cantilever I-steel in place.
And step three, embedding the lacing wire embedding piece.
And step five, correcting and adjusting the elevation position.
And step six, pre-checking and accepting.
And seventhly, placing a positioning line and paving a scaffold board.
And step eight, erecting a vertical rod.
Step nine, vertical and horizontal rods.
Step ten, setting a shear brace.
And step eleven, node setting.
And step twelve, elevation control.
And thirteen steps of laying the main keel and the secondary keel.
Fourteen, paving the beam slab template.
And step fifteen, after the template is laid, measuring the elevation of the template by using a level gauge, and correcting.
Sixthly, applying a preloading load and observing deformation.
Sixthly, checking and accepting.
2. The construction method of the overhanging structure high-support template buckling frame body according to claim 1, is characterized in that: the base is a 20# overhanging I-beam, a 100mm high phi 16 reinforcing steel bar fixing scaffold tube is welded on the I-beam at intervals of 1m, the first reinforcing steel bar is 500mm away from the side of a frame beam, 1250mm and 3250mm away from the outer end of the I-beam, pull rod stress supporting triangular prisms are respectively arranged below the I-beam, the peripheries of the triangular prisms are connected in a full welding mode, and each triangular prism is composed of three 12mm thick steel plates; and a steel pipe blocking foot which is 200mm long and phi 48 is welded at the lower end of the I-steel at a position 5250mm away from the outer end of the I-steel. The welding rod is E43 type, and the height of the welding seam is not less than 6 mm.
3. The construction method of the overhanging structure high-support template buckling frame body according to claim 1, is characterized in that: the template adopts a glued wood template with the thickness of 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483130.XA CN114775993A (en) | 2022-05-05 | 2022-05-05 | Construction method for overhanging structure high-support formwork buckling frame body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483130.XA CN114775993A (en) | 2022-05-05 | 2022-05-05 | Construction method for overhanging structure high-support formwork buckling frame body |
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| Publication Number | Publication Date |
|---|---|
| CN114775993A true CN114775993A (en) | 2022-07-22 |
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|---|---|---|---|
| CN202210483130.XA Pending CN114775993A (en) | 2022-05-05 | 2022-05-05 | Construction method for overhanging structure high-support formwork buckling frame body |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013160011A (en) * | 2012-02-08 | 2013-08-19 | Nisso Ind Co Ltd | Suspended scaffold and method for installing the same |
| CN103821360A (en) * | 2014-02-28 | 2014-05-28 | 中天建设集团有限公司 | Construction method for high-altitude long-span cantilever formwork |
| CN107587711A (en) * | 2017-09-25 | 2018-01-16 | 中铁五局集团建筑工程有限责任公司 | A kind of regularization assembled overhanging protection canopy and its assembly method |
| CN207211738U (en) * | 2017-08-16 | 2018-04-10 | 中国建筑第二工程局有限公司 | I-steel formwork that encorbelments |
| CN210316454U (en) * | 2019-06-28 | 2020-04-14 | 广东建星建造集团有限公司 | Large-span roof overhanging support system |
| CN215254604U (en) * | 2021-05-13 | 2021-12-21 | 中建城市建设发展有限公司 | Template support system encorbelments |
-
2022
- 2022-05-05 CN CN202210483130.XA patent/CN114775993A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013160011A (en) * | 2012-02-08 | 2013-08-19 | Nisso Ind Co Ltd | Suspended scaffold and method for installing the same |
| CN103821360A (en) * | 2014-02-28 | 2014-05-28 | 中天建设集团有限公司 | Construction method for high-altitude long-span cantilever formwork |
| CN207211738U (en) * | 2017-08-16 | 2018-04-10 | 中国建筑第二工程局有限公司 | I-steel formwork that encorbelments |
| CN107587711A (en) * | 2017-09-25 | 2018-01-16 | 中铁五局集团建筑工程有限责任公司 | A kind of regularization assembled overhanging protection canopy and its assembly method |
| CN210316454U (en) * | 2019-06-28 | 2020-04-14 | 广东建星建造集团有限公司 | Large-span roof overhanging support system |
| CN215254604U (en) * | 2021-05-13 | 2021-12-21 | 中建城市建设发展有限公司 | Template support system encorbelments |
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