CN115627912A - Construction method of assembled externally-mounted flower basket type overhanging scaffold - Google Patents
Construction method of assembled externally-mounted flower basket type overhanging scaffold Download PDFInfo
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- CN115627912A CN115627912A CN202211136780.3A CN202211136780A CN115627912A CN 115627912 A CN115627912 A CN 115627912A CN 202211136780 A CN202211136780 A CN 202211136780A CN 115627912 A CN115627912 A CN 115627912A
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 151
- 239000010959 steel Substances 0.000 claims abstract description 151
- 238000010408 sweeping Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- 238000005034 decoration Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 claims 1
- 238000003754 machining Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000007547 defect Effects 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
- 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
- E04G5/001—Safety or protective measures against falling down relating to scaffoldings
-
- 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
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/02—Scaffold feet, e.g. with arrangements for adjustment
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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
- E04G5/045—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on profiles, e.g. I or H profiles
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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
- E04G5/06—Consoles; Brackets
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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
- E04G5/08—Scaffold boards or planks
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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
- E04G5/12—Canopies
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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
- E04G5/14—Railings
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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
- E04G5/16—Struts or stiffening rods, e.g. diagonal rods
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Movable Scaffolding (AREA)
Abstract
The invention relates to the technical field of civil engineering construction, in particular to a construction method of an assembled type externally-mounted flower basket type overhanging scaffold; comprises a pre-buried screw; welding girder I-shaped steel; mounting 16# I-steel of the connecting beam; placing a floor sweeping rod; placing a longitudinal floor sweeping rod; arranging a stand column; installing a transverse floor sweeping rod; installing a first-step longitudinal horizontal rod; installing a first step of transverse horizontal rods; installing a wall connecting piece: mounting a second-step longitudinal horizontal rod; mounting a second step of transverse horizontal rods; installing a pull rod; erecting a railing; a cross brace is additionally arranged: the scissors supports are continuously arranged along the height of the cantilever frame body, and the angle is 45 to 60 degrees; paving a scaffold board; and (5) installing a steel plate net. The method changes the section steel cantilever beam and the floor beam plate into high-strength bolt anchoring connection, and the cantilever end is obliquely pulled on the upper layer beam plate by round steel to form an outer frame steel pipe erection platform. Compare traditional type frame of encorbelmenting, reduced the steel quantity, the girder steel length of encorbelmenting shortens more than half than traditional girder steel of encorbelmenting, the cost is reduced.
Description
Technical Field
The invention relates to the technical field of civil engineering construction, in particular to a construction method of an assembled type externally-mounted flower basket type overhanging scaffold.
Background
Because the traditional overhanging scaffold is long in setting time, workers need to continuously repeat high-altitude setting and dismounting operations, the workload is large, people fall down, and the risk is high; meanwhile, the traditional overhanging scaffold can damage the structure of an outer floor slab when I-shaped steel is erected and installed, and particularly, the damage capability of special parts of internal and external corners and a balcony is very large.
Disclosure of Invention
The invention aims to overcome the defects and provides a construction method of an assembled externally-mounted flower basket type overhanging scaffold.
In order to achieve the above object, the present invention is realized by:
a construction method of an assembled externally-arranged flower basket type overhanging scaffold comprises
step 1.1, erecting I-shaped steel of a flower basket cantilever frame above a lower-layer scaffold, and installing an anchor bolt embedded part;
step 1.2, jacking and reinforcing the balcony part and the upper pull rod part by using a steel pipe and a jacking wire before installation;
step 1.3, covering the part of a roof stair, inwards retreating the machine room layer east, west and south vertical building, laying a frame body at the part on the cast-in-place surface of the roof, generally laying 12# channel steel on the frame body as a base plate of the frame body, and conventionally erecting the frame body to the upper end to add 1.2m ultrahigh protection; the frame body and the frame body adjacent to the frame body are disconnected and erected;
step 1.4, the positions of the construction lifter and the safety channel, and a wall connecting piece and a transverse inclined support are added to an open type scaffold formed by arranging the construction lifter and the unloading platform according to the standard requirement;
step 2, welding girder I-steel:
temporarily erecting the cantilever section steel on a scaffold upright rod at the bottom of the cantilever section steel, placing the cantilever section steel on two longitudinal large cross rods in advance to jack the section steel, and fixing the section steel beam welded with the base steel plate on the side surfaces of a peripheral wall, a column and a beam of the main structure by using detachable high-strength bolts;
step 3, mounting 16# I-steel of the connecting beam;
step 4, placing a floor sweeping rod:
after the I-shaped steel for overhanging is completely installed in place, firstly arranging a ground sweeping rod of the overhanging frame on the I-shaped steel, and after the ground sweeping rod is arranged, sleeving the vertical rod on the reinforcing steel bar head and firmly connecting the vertical rod with the ground sweeping rod;
step 5, placing a longitudinal floor sweeping rod: a right-angle fastener is adopted to be fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod;
step 6, setting a stand column:
the distance between each joint and the upright post is not more than 500mm, and the joints are arranged in a staggered manner, are not synchronous and span the same;
step 7, installing a transverse floor sweeping rod: the transverse sweeping rod is also fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener;
step 8, mounting a first-step longitudinal horizontal rod;
step 9, mounting a first step transverse horizontal rod;
step 10, installing a wall connecting piece:
step 10.1, connecting wall connecting pieces on the north and south sides with a window opening through steel pipes, reserving 70mm round holes in the structure of the area without the opening of the gable on the east and west sides, and locking the steel pipes by using horizontal steel pipes after the steel pipes penetrate through the reserved holes;
step 10.2, the positions of the wall connecting points are arranged at the nodes intersected with the vertical rods and the longitudinal horizontal rods, the distance between the wall connecting points and the nodes is not more than 300mm, the wall connecting pieces are horizontally arranged at every 4-6 m and vertically arranged on each layer in a quincunx shape, the wall connecting pieces are required to be vertical to the wall surface, the heights of external scaffolds of the project are all less than 20m, and the wall connecting points are all arranged in a two-step three-span mode;
step 10.3, setting a pulling point on the scaffold and the building according to the arrangement requirement of the wall connecting piece in the calculation book, wherein the pulling point is encrypted in the corner range and at the top;
step 10.4, the wall connecting pieces are arranged along layers in the vertical direction, are horizontally arranged according to 3 spans at an interval of 4.5m, and are connected with wall connecting rods in the wall connecting pieces in a horizontal mode;
step 10.5, the wall connecting piece is arranged from the position of the longitudinal horizontal rod in the first step of the bottom layer, and when the position is difficult to arrange, other reliable measures are adopted for fixing;
step 10.6, the pulling node is ensured to be firm and prevented from moving and deforming, is arranged at the joint of the longitudinal and transverse horizontal rods of the outer frame as much as possible and is preferably arranged close to the main node, and the distance deviating from the main node is not more than 300mm;
step 10.7, the external wall decoration stage tie points also need to meet the requirements, and reliable and effective temporary tie points need to be re-arranged when the original tie points need to be removed in construction so as to ensure the safety and reliability of the external frame;
step 10.8, when the lower part of the scaffold can not be provided with the wall connecting piece temporarily, a overturn prevention measure is adopted, when the throwing support is erected, the throwing support adopts a full-length rod piece and is fixed on the scaffold by a rotary fastener, and the inclination angle between the throwing support and the ground is 45-60 degrees; the distance from the center of the connecting point to the main node is not more than 300mm, and the throwing support is detachable after the wall connecting piece is erected;
step 11, mounting a second-step longitudinal horizontal rod;
step 12, installing a second horizontal rod;
step 13, installing a pull rod:
step 13.1, erecting a frame body upwards to be not more than 6m before connecting the pull rod, forbidding stacking materials and operation on the frame, arranging a top support, when the strength of concrete at the pre-embedded position of the pull rod on the cantilever frame reaches C15, allowing the cantilever frame to bear force, and allowing the cantilever frame to bear load after the pull rod is stressed; ear plates are welded at two ends of the steel bar pull rod and are fixed with the upper end part of the steel beam and a hanging support fixed on a building by bolts;
step 13.2, the balcony part is directly connected with a structure Liang Lajie on the outer opening beam, and the diagonal draw bar is arranged on a structure Liang Waikou beam and is connected with the pull bar;
before the elevator enters the entrance of the hole and the elevator is not installed, protective railings or fixed gates are required to be arranged, the height of the protective railings or the fixed gates is 1.8m, the railings and/or the fixed gates are required to be toolized, finalized and normalized, and protective steel fences are completely installed on vertical planes of the railings on the four side surfaces of the shed roof;
step 15, additionally arranging a cross brace: the scissor supports are continuously arranged along the height of the cantilever frame body, and the angle is 45 to 60 degrees;
step 16, paving a scaffold board:
step 16.1, paving the scaffold boards of the operation layer fully and stably by using wood gangboards;
step 16.2, the length direction of the wood springboard is perpendicular to the large cross rod and is in butt joint and flat paving, four corners are firmly bound with the horizontal rod by applying No. 18 iron wires, and the length of a probe of a board head is not more than 150mm;
step 16.3, arranging the scaffold boards on the transverse horizontal rods, and when the length of each scaffold board is less than 2m, adopting two transverse horizontal rods for supporting, but reliably fixing the two ends of each scaffold board and the transverse horizontal rods to prevent the scaffold boards from tipping; when the scaffold boards are butted and tiled, two transverse horizontal rods are required to be arranged at the joint, the external extension of the scaffold boards is 130-150mm, and the sum of the external extension lengths of the two scaffold boards is not more than 300mm.
Step 16.4, reliably connecting the scaffold plates at the corners and the platform openings of the inclined chutes with the transverse horizontal rods to prevent sliding;
step 17, installing a steel plate net:
fixing a steel plate net on the outer side of the outer vertical rod of the scaffold; the steel plate net is filled on the outer side of the frame body, the keel is a galvanized square tube 20 multiplied by 1.5, the thickness of the panel before molding is 0.8, the specification is 1.5 multiplied by 1.8m, the steel plate net is continuously arranged, snap rings between the steel plate net are connected through bolts, the steel plate net is convenient to disassemble, the steel plate net and the square tube are fixed through drill tail screws or rivets, and the fixed distance is 200mm.
According to the construction method of the assembled type externally-mounted flower basket type overhanging scaffold, when the overhanging outer frame is constructed, a person-cargo ladder is left, two ends of the outer frame are disconnected and erected, two ends of an opening of the scaffold are required to be continuously provided with wall connecting pieces between layers, a cargo bed and the wall connecting pieces are independently arranged, and the distance between the wall connecting pieces and the wall connecting pieces is the height of a building layer; the open ends of the double-row scaffold are continuously provided with zigzag struts for reinforcement from bottom to top of each landing and overhanging section; the inclined struts are erected on the frame bodies on the two sides of the elevator, so that the stability of the frame bodies is guaranteed.
According to the construction method of the assembled externally-mounted basket type overhanging scaffold, the external corner overhanging beam or the anchor point of the pull rod is fixed with the section steel by adopting an embedded part bolt in the structure, the embedded part is an M20-8.8-level high-strength double-headed screw, a phi 25 metal sleeve is embedded into the structure by 150mm, and an overhanging beam bottom plate is connected with the embedded part in the building structure by the M20-8.8-level high-strength double-headed screw.
According to the construction method of the assembled type externally-mounted flower basket type overhanging scaffold, an external corner part or a steel section bottom plate is V-shaped, a movable positioning pile is arranged at a position 10-20 cm away from the front end of an I-shaped steel on an iron plate at the end part of the I-shaped steel so as to stabilize the upright rod of the scaffold, and the tail end of the I-shaped steel is fully welded with the I-shaped steel by adopting a steel plate.
According to the construction method of the assembled externally-mounted basket type overhanging scaffold, when a steel plate is fixed, the steel plate does not need to pass through a structural beam or a shear wall when meeting a shear wall or a structural beam or a structural column, and the embedded parts adopt embedded parts, namely phi 20 high-strength bolts and plastic sleeves.
The construction method of the assembled externally-mounted basket type overhanging scaffold comprises the step of processing a basket bolt. The carbon high-quality steel with the diameter of 20 multiplied by 1.6 meters and the diameter of 20 multiplied by 1.0 meter and three carbon high-quality steels with the diameter of 14 meters are welded on two sides, and the flower basket bolts which are processed and formed are combined and installed.
The method changes the construction method of anchoring the traditional section steel beam on the floor, changes the section steel cantilever beam and the floor beam plate into anchoring connection by adopting the high-strength bolt, and adopts round steel to be obliquely pulled on the upper beam plate at the overhanging end to form the outer frame steel pipe erection platform. Compare traditional type frame of encorbelmenting, reduced the steel quantity, the girder steel length of encorbelmenting shortens more than half than traditional girder steel of encorbelmenting, the cost is reduced.
The method also changes the traditional construction method of unloading by using the steel wire rope, the upper part of the beam end is connected by using round steel, the tightening stress of the turn buckle can play the roles of fixing, unloading and relieving the bending moment of the steel beam support, and the turn buckle and the round steel can be recycled for secondary use, so that the method is safer, economic and reasonable compared with the conventional steel wire rope and reduces the cost.
Because the girder steel of encorbelmenting needn't stretch into in the building, need not the wall and reserve the entrance to a cave, need not to seal the benefit once more during the wall construction, do not influence follow-up operation floor face terrace construction, need not to wait to encorbelment the girder steel and demolish the back and carry out terrace construction, accelerate the interior decoration progress again, reduced the quality general fault of entrance to a cave infiltration and shortened the time limit for a project again.
Drawings
Fig. 1 is a schematic diagram of the connection of the embedded screws.
Fig. 2 is a schematic connection diagram of the wall connecting member.
Fig. 3 is a schematic view of the tie bar connection.
Fig. 4 is a schematic view of the connection of the scaffold board.
Fig. 5 is a schematic view of the cantilever external frame.
Fig. 6 is a schematic view of an external corner cantilever beam node.
Fig. 7 is a structural schematic diagram of a turn buckle.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in figures 1 to 7, the construction method of the assembled type externally-mounted flower basket type overhanging scaffold comprises the following steps
step 1.1, erecting I-shaped steel of a flower basket cantilever frame above a lower-layer scaffold, and installing an anchor bolt embedded part;
step 1.2, jacking and reinforcing the balcony part and the upper pull rod part by using a steel pipe and a jacking wire before installation;
step 1.3, covering the part of a roof stair, inwards retreating the machine room layer east, west and south vertical building, laying a frame body at the part on the cast-in-place surface of the roof, generally laying 12# channel steel on the frame body as a base plate of the frame body, and conventionally erecting the frame body to the upper end to add 1.2m ultrahigh protection; the frame body and the frame body adjacent to the frame body are disconnected and erected;
step 1.4, the positions of the construction elevator and the safety channel, and the frame body is additionally provided with a wall connecting piece and a transverse inclined support according to the standard requirement for an open type scaffold formed by arranging the construction elevator and the unloading platform;
step 2, welding girder I-steel:
temporarily erecting the cantilever section steel on a scaffold upright rod at the bottom of the cantilever section steel, placing the cantilever section steel on two longitudinal large cross rods in advance to jack the section steel, and fixing the section steel beam welded with the base steel plate on the side surfaces of a peripheral wall, a column and a beam of the main structure by using detachable high-strength bolts;
step 3, mounting 16# I-steel of the connecting beam;
step 4, placing a floor sweeping rod:
after the I-shaped steel for overhanging is completely installed in place, firstly arranging a ground sweeping rod of the overhanging frame on the I-shaped steel, and after the ground sweeping rod is arranged, sleeving the vertical rod on the reinforcing steel bar head and firmly connecting the vertical rod with the ground sweeping rod;
step 5, placing a longitudinal floor sweeping rod: a right-angle fastener is adopted to be fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod;
step 6, setting a stand column:
the distance between each joint and the upright post is not more than 500mm, and the joints are arranged in a staggered manner, are not synchronous and span the same;
step 7, installing a transverse floor sweeping rod: the transverse sweeping rod is also fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener;
step 8, mounting a first-step longitudinal horizontal rod;
step 9, installing a first step transverse horizontal rod;
step 10, installing a wall connecting piece:
step 10.1, connecting wall connecting pieces on the north and south sides with a window opening through steel pipes, reserving 70mm round holes in the structure of the area without the opening of the gable on the east and west sides, and locking the steel pipes by using horizontal steel pipes after the steel pipes penetrate through the reserved holes;
step 10.2, the positions of the wall connecting points are arranged at the nodes intersected with the vertical rods and the longitudinal horizontal rods, the distance between the wall connecting points and the nodes is not more than 300mm, the wall connecting pieces are horizontally arranged at every 4-6 m and vertically arranged on each layer in a quincunx shape, the wall connecting pieces are required to be vertical to the wall surface, the heights of external scaffolds of the project are all less than 20m, and the wall connecting points are all arranged in a two-step three-span mode;
step 10.3, setting a pulling point on the scaffold and the building according to the arrangement requirement of the wall connecting piece in the calculation book, wherein the pulling point is encrypted in the corner range and at the top;
step 10.4, the wall connecting pieces are arranged along layers in the vertical direction, are horizontally arranged according to 3 spans at an interval of 4.5m, and are connected with wall connecting rods in the wall connecting pieces in a horizontal mode;
step 10.5, the wall connecting piece is arranged from the position of the longitudinal horizontal rod in the first step of the bottom layer, and when the position is difficult to arrange, other reliable measures are adopted for fixing;
step 10.6, the pulling node is ensured to be firm and prevented from moving and deforming, is arranged at the joint of the longitudinal and transverse horizontal rods of the outer frame as much as possible and is preferably arranged close to the main node, and the distance deviating from the main node is not more than 300mm;
step 10.7, the external wall decoration stage tie points also need to meet the requirements, and reliable and effective temporary tie points need to be re-arranged when the original tie points need to be removed in construction so as to ensure the safety and reliability of the external frame;
step 10.8, when the lower part of the scaffold can not be provided with the wall connecting piece temporarily, a overturn prevention measure is adopted, when a throwing support is erected, the throwing support adopts a through long rod piece and is fixed on the scaffold by a rotary fastener, and the inclination angle between the throwing support and the ground is 45-60 degrees; the distance from the center of the connecting point to the main node is not more than 300mm, and the throwing support is detachable after the wall connecting piece is erected;
step 11, mounting a second-step longitudinal horizontal rod;
step 12, installing a second horizontal rod;
step 13, installing a pull rod:
step 13.1, erecting a frame body upwards to be not more than 6m before connecting the pull rod, forbidding stacking materials and operation on the frame, arranging a top support, when the strength of concrete at the pre-embedded position of the pull rod on the cantilever frame reaches C15, allowing the cantilever frame to bear force, and allowing the cantilever frame to bear load after the pull rod is stressed; ear plates are welded at two ends of the steel bar pull rod and are fixed with the upper end part of the steel beam and a hanging support fixed on a building by bolts;
step 13.2, the balcony part is directly connected with a structure Liang Lajie on the outer opening beam, and the diagonal draw bar is arranged on a structure Liang Waikou beam and is connected with the pull bar;
before the elevator enters the entrance of the hole and the elevator is not installed, protective railings or fixed gates are required to be arranged, the height of the protective railings or the fixed gates is 1.8m, the railings and/or the fixed gates are required to be toolized, finalized and normalized, and protective steel fences are completely installed on vertical planes of the railings on the four side surfaces of the shed roof;
step 15, additionally arranging a cross brace: the scissor supports are continuously arranged along the height of the cantilever frame body, and the angle is 45 to 60 degrees;
step 16, paving a scaffold board:
step 16.1, paving the scaffold boards of the operation layer fully and stably by using wood springboards;
step 16.2, the length direction of the wood springboard is perpendicular to the large cross rod and is in butt joint and flat paving, four corners are firmly bound with the horizontal rod by applying No. 18 iron wires, and the length of a probe of a board head is not more than 150mm;
step 16.3, the scaffold board is arranged on the transverse horizontal rods, when the length of the scaffold board is less than 2m, the scaffold board is supported by the two transverse horizontal rods, but two ends of the scaffold board are reliably fixed with the scaffold board, so that the scaffold board is prevented from tipping over; when the scaffold boards are butted and tiled, two transverse horizontal rods are required to be arranged at the joint, the external extension of the scaffold boards is 130-150mm, and the sum of the external extension lengths of the two scaffold boards is not more than 300mm.
Step 16.4, the scaffold boards at the corners and the platform openings of the inclined chutes are reliably connected with the transverse horizontal rods to prevent sliding;
step 17, installing a steel plate net:
fixing a steel plate net outside the outer vertical rod of the scaffold; the steel plate net is filled on the outer side of the frame body, the keel is a galvanized square tube 20 multiplied by 1.5, the thickness of the panel before molding is 0.8, the specification is 1.5 multiplied by 1.8m, the steel plate net is continuously arranged, snap rings between the steel plate net are connected through bolts, the steel plate net is convenient to disassemble, the steel plate net and the square tube are fixed through drill tail screws or rivets, and the fixed distance is 200mm.
According to the construction method of the assembled external flower basket type overhanging scaffold, during construction of the overhanging outer frame, the position of a people and goods ladder is vacant, two ends of the outer frame are disconnected and erected, two ends of an opening of the scaffold are required to be continuously provided with wall connecting pieces, namely, a goods material platform and wall connecting pieces are arranged independently between layers, and the distance between the wall connecting pieces and the wall connecting pieces is the height of a building layer; the open ends of the double-row scaffold are continuously provided with zigzag struts for reinforcement from bottom to top of each landing and overhanging section; the inclined struts are erected on the frame bodies on the two sides of the elevator, so that the stability of the frame bodies is guaranteed.
According to the construction method of the assembled externally-mounted basket type overhanging scaffold, the external corner overhanging beam or the anchor point of the pull rod is fixed with the section steel by adopting an embedded part bolt in the structure, the embedded part is an M20-8.8-level high-strength double-headed screw, a phi 25 metal sleeve is embedded into the structure by 150mm, and an overhanging beam bottom plate is connected with the embedded part in the building structure by the M20-8.8-level high-strength double-headed screw.
According to the construction method of the assembled externally-mounted flower basket type cantilever scaffold, an external corner part or a section steel bottom plate is V-shaped, a movable positioning pile is arranged at a position 10 to 20 cm away from the front end of an I-shaped steel on an iron plate at the end part of the I-shaped steel so as to stabilize the upright rod of the scaffold, and the tail end of the I-shaped steel is fully welded with the I-shaped steel through a steel plate.
According to the construction method of the assembled externally-mounted basket type overhanging scaffold, when a steel plate is fixed, the steel plate does not need to pass through a structural beam or a shear wall when meeting a shear wall or a structural beam or a structural column, and the embedded parts adopt embedded parts, namely phi 20 high-strength bolts and plastic sleeves.
The construction method of the assembled externally-mounted basket type overhanging scaffold comprises the step of processing a basket bolt. The carbon high-quality steel with the diameter of 20 multiplied by 1.6 meters and the diameter of 20 multiplied by 1.0 meter and three carbon high-quality steels with the diameter of 14 meters are welded on two sides, and the flower basket bolts which are processed and formed are combined and installed.
The method changes the construction method of anchoring the traditional section steel beam on the floor, changes the section steel cantilever beam and the floor beam plate into anchoring connection by adopting the high-strength bolt, and adopts round steel to be obliquely pulled on the upper beam plate at the overhanging end to form the outer frame steel pipe erection platform. Compare traditional type frame of encorbelmenting, reduced the steel quantity, the girder steel length of encorbelmenting shortens more than half than traditional girder steel of encorbelmenting, the cost is reduced.
The method also changes the traditional construction method of unloading by using the steel wire rope, the upper part of the beam end is connected by using round steel, the tightening stress of the turn buckle can play the roles of fixing, unloading and relieving the bending moment of the steel beam support, and the turn buckle and the round steel can be recycled for secondary use, so that the method is safer, economic and reasonable compared with the conventional steel wire rope and reduces the cost.
Because the girder steel of encorbelmenting needn't stretch into in the building, need not the wall and reserve the entrance to a cave, need not to seal the benefit once more during the wall construction, do not influence follow-up operation floor face terrace construction, need not to wait to encorbelment the girder steel and demolish the back and carry out terrace construction, accelerate the interior decoration progress again, reduced the quality general fault of entrance to a cave infiltration and shortened the time limit for a project again.
Claims (7)
1. A construction method of an assembled externally-mounted flower basket type overhanging scaffold is characterized by comprising the following steps: comprises that
Step 1, pre-embedding a screw:
step 1.1, erecting I-shaped steel of a flower basket cantilever frame above a lower-layer scaffold, and installing an anchor bolt embedded part;
step 1.2, jacking and reinforcing the balcony part and the upper pull rod part by using a steel pipe and a jacking wire before installation;
step 1.3, covering the part of a roof stair, inwards retreating the machine room layer east, west and south vertical building, laying a frame body at the part on the cast-in-place surface of the roof, generally laying 12# channel steel on the frame body as a base plate of the frame body, and conventionally erecting the frame body to the upper end to add 1.2m ultrahigh protection; the frame body and the frame body adjacent to the frame body are disconnected and erected;
step 1.4, the positions of the construction lifter and the safety channel, and a wall connecting piece and a transverse inclined support are added to an open type scaffold formed by arranging the construction lifter and the unloading platform according to the standard requirement;
step 2, welding girder I-steel:
temporarily erecting the cantilever section steel on a scaffold upright rod at the bottom of the cantilever section steel, placing the cantilever section steel on two longitudinal large cross rods in advance to jack the section steel, and fixing the section steel beam welded with the base steel plate on the side surfaces of a peripheral wall, a column and a beam of a main structure by using detachable high-strength bolts;
step 3, mounting 16# I-steel of the connecting beam;
step 4, placing a floor sweeping rod:
after the cantilever I-shaped steel is completely installed in place, firstly arranging a cantilever frame floor sweeping rod on the I-shaped steel, and after the floor sweeping rod is arranged, sleeving the vertical rod on the steel bar head and firmly connecting the vertical rod with the floor sweeping rod;
step 5, placing a longitudinal floor sweeping rod: a right-angle fastener is adopted to be fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod;
step 6, setting a stand column:
the distance between each joint and the upright post is not more than 500mm, and the joints are arranged in a staggered manner, are not synchronous and span the same;
step 7, installing a transverse floor sweeping rod: the transverse sweeping rod is also fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener;
step 8, mounting a first-step longitudinal horizontal rod;
step 9, installing a first step transverse horizontal rod;
step 10, installing a wall connecting piece:
step 10.1, connecting wall connecting pieces on the north and south sides with a window opening through steel pipes, reserving 70mm round holes in the structure of the area without the opening of the gable on the east and west sides, and locking the steel pipes by using horizontal steel pipes after the steel pipes penetrate through the reserved holes;
step 10.2, the positions of the wall connecting points are arranged at the nodes intersected with the vertical rods and the longitudinal horizontal rods, the distance between the wall connecting points and the nodes is not more than 300mm, the wall connecting pieces are horizontally arranged at every 4-6 m and vertically arranged on each layer in a quincunx shape, the wall connecting pieces are required to be vertical to the wall surface, the heights of external scaffolds of the project are all less than 20m, and the wall connecting points are all arranged in a two-step three-span mode;
step 10.3, setting a pulling point on the scaffold and the building according to the arrangement requirement of the wall connecting piece in the calculation book, wherein the pulling point is encrypted in the corner range and at the top;
step 10.4, the wall connecting pieces are vertically arranged along layers, horizontally arranged according to 3 spans at an interval of 4.5m, wall connecting rods in the wall connecting pieces are horizontally arranged, and when the wall connecting pieces cannot be horizontally arranged, the wall connecting rods are connected downwards obliquely to one end of a scaffold;
step 10.5, the wall connecting piece is arranged from the position of the longitudinal horizontal rod in the first step of the bottom layer, and when the position is difficult to arrange, other reliable measures are adopted for fixing;
step 10.6, the pulling node is ensured to be firm and prevented from moving and deforming, is arranged at the joint of the longitudinal and transverse horizontal rods of the outer frame as much as possible and is preferably arranged close to the main node, and the distance deviating from the main node is not more than 300mm;
step 10.7, the external wall decoration stage tie points also need to meet the requirements, and reliable and effective temporary tie points need to be re-arranged when the original tie points need to be removed in construction so as to ensure the safety and reliability of the external frame;
step 10.8, when the lower part of the scaffold can not be provided with the wall connecting piece temporarily, a overturn prevention measure is adopted, when a throwing support is erected, the throwing support adopts a through long rod piece and is fixed on the scaffold by a rotary fastener, and the inclination angle between the throwing support and the ground is 45-60 degrees; the distance from the center of the connecting point to the main node is not more than 300mm, and the throwing support is detachable after the wall connecting piece is erected;
step 11, mounting a second-step longitudinal horizontal rod;
step 12, installing a second horizontal rod;
step 13, installing a pull rod:
step 13.1, erecting a frame body upwards to be not more than 6m before connecting the pull rod, forbidding stacking materials and operation on the frame, arranging a top support, when the strength of concrete at the pre-embedded position of the pull rod on the cantilever frame reaches C15, allowing the cantilever frame to bear force, and allowing the cantilever frame to bear load after the pull rod is stressed; ear plates are welded at two ends of the steel bar pull rod and are fixed with the upper end part of the steel beam and a hanging support fixed on a building by bolts;
step 13.2, the balcony part is directly connected with a structure Liang Lajie on the outer opening beam, and the diagonal draw bar is arranged on a structure Liang Waikou beam and is connected with the pull bar;
step 14, setting up a railing:
before the elevator enters the entrance of the hole and the elevator is not installed, protective railings or fixed gates are required to be arranged, the height of the protective railings or the fixed gates is 1.8m, the railings and/or the fixed gates are required to be toolized, finalized and normalized, and protective steel fences are completely installed on vertical planes of the railings on the four side surfaces of the shed roof;
step 15, additionally arranging a cross brace: the scissor supports are continuously arranged along the height of the cantilever frame body, and the angle is 45 to 60 degrees;
step 16, paving a scaffold board:
step 16.1, paving the scaffold boards of the operation layer fully and stably by using wood springboards;
step 16.2, the length direction of the wood springboard is perpendicular to the large cross rod and is in butt joint and flat paving, four corners are firmly bound with the horizontal rod by applying No. 18 iron wires, and the length of a probe of a board head is not more than 150mm;
step 16.3, the scaffold board is arranged on the transverse horizontal rods, when the length of the scaffold board is less than 2m, the scaffold board is supported by the two transverse horizontal rods, but two ends of the scaffold board are reliably fixed with the scaffold board, so that the scaffold board is prevented from tipping over; when the scaffold boards are butted and tiled, two transverse horizontal rods are required to be arranged at the joint, the external extension of the scaffold boards is 130-150mm, and the sum of the external extension lengths of the two scaffold boards is not more than 300mm.
2. Step 16.4, the scaffold boards at the corners and the platform openings of the inclined chutes are reliably connected with the transverse horizontal rods to prevent sliding;
step 17, installing a steel plate net:
fixing a steel plate net outside the outer vertical rod of the scaffold; the steel plate net is filled on the outer side of the frame body, the keel is a galvanized square tube 20 multiplied by 1.5, the thickness of the panel before molding is 0.8, the specification is 1.5 multiplied by 1.8m, the steel plate net is continuously arranged, snap rings between the steel plate net are connected through bolts, the steel plate net is convenient to disassemble, the steel plate net and the square tube are fixed through drill tail screws or rivets, and the fixed distance is 200mm.
3. The method for constructing an assembled externally-mounted flower basket type overhanging scaffold according to claim 1, wherein: when the overhanging outer frame is constructed, the position of a man-cargo ladder is vacated, two ends of the outer frame are disconnected and erected, two ends of the opening of the scaffold are required to be continuously provided with wall connecting pieces between layers, and the wall connecting pieces are independently arranged, and the distance between the wall connecting pieces and the cargo platform is the height of a building layer; the open ends of the double rows of scaffolds are continuously provided with the zigzag supports for reinforcement from bottom to top in each landing and overhanging section; the inclined struts are erected on the frame bodies on the two sides of the elevator, so that the stability of the frame bodies is guaranteed.
4. The method for constructing an assembled externally-mounted flower basket type overhanging scaffold according to claim 1, wherein: the external corner cantilever beam or the pull rod anchoring point is fixed with the section steel by adopting an embedded part bolt in the structure, the embedded part is a high-strength double-headed screw of M20-8.8 level, a phi 25 metal sleeve is embedded into the structure for 150mm, and the cantilever beam bottom plate is connected with the embedded part in the building structure by using the high-strength double-headed screw of M20-8.8 level.
5. The method for constructing an assembled externally-mounted flower basket type overhanging scaffold according to claim 1, wherein: and a movable positioning pile is arranged at the position of an external corner or a V-shaped structural steel bottom plate, the distance between an iron plate at the end part of the I-shaped steel and the front end of the I-shaped steel is 10 to 20 centimeters so as to stabilize the vertical rod of the scaffold, and the tail end of the I-shaped steel is fully welded with the I-shaped steel by adopting a steel plate.
6. The method for constructing an assembled externally-mounted flower basket type overhanging scaffold according to claim 1, wherein: when the steel plate is fixed, the shear wall or the structural beam and the structural column do not need to pass through the structural beam and the shear wall, and the embedded part adopts an embedded part, namely a phi 20 high-strength bolt and a plastic sleeve.
7. The method for constructing an assembled externally-mounted flower basket type overhanging scaffold according to claim 1, wherein: machining the turn buckle: the carbon high-quality steel with the diameter of 20 multiplied by 1.6 meters and the diameter of 20 multiplied by 1.0 meter and three carbon high-quality steels with the diameter of 14 meters are welded on two sides, and the flower basket bolts which are processed and formed are combined and installed.
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| CN115961774A (en) * | 2023-02-07 | 2023-04-14 | 中国二十二冶集团有限公司 | Construction method of outer protection frame corresponding to engineering elevator |
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