CN115478710A - High-rise building roof cantilever structure dismantling construction method - Google Patents
High-rise building roof cantilever structure dismantling construction method Download PDFInfo
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- CN115478710A CN115478710A CN202211150021.2A CN202211150021A CN115478710A CN 115478710 A CN115478710 A CN 115478710A CN 202211150021 A CN202211150021 A CN 202211150021A CN 115478710 A CN115478710 A CN 115478710A
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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
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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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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- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a construction method for dismantling a roof overhanging structure of a high-rise building, which is characterized in that an independent overhanging platform is erected as a base, a safe construction platform and a vertical face safe protection are established, and nondestructive cutting and dismantling are realized.
Description
Technical Field
The invention belongs to the technical field of high-rise building construction, and particularly relates to a construction method for dismantling a roof cantilever structure of a high-rise building.
Background
In the process of city development and expansion, the living environment of people is seriously influenced due to the fact that a batch of high-rise buildings are poor in construction quality due to insufficient supervision, and the life safety of surrounding residents is seriously influenced due to the fact that concrete falls off and steel bars are corroded in part of the buildings and the concrete falls off.
The roof cantilever structure of the high-rise building is dismantled by edge operation, the construction difficulty is high, and great construction potential safety hazards exist. The hoisting difficulty is high, and the requirements on the arm length and the amplitude of the crane are high. In old urban areas, people are dense and streets are narrow, and large hoisting equipment is limited in erection conditions.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention provides a high-rise building roof overhanging structure dismantling construction method, an overhanging construction platform provides a closed and safe construction site, the safety of operators in the construction process is guaranteed, the influence of the construction process on the daily life of residents in a modified community is reduced to the maximum extent, the coordination work in the construction process is reduced, the damage of the original structural layer of the roof is reduced, the roof recovery cost is reduced, and the technical problems are solved.
A construction method for dismantling a roof cantilever structure of a high-rise building comprises the following construction steps:
s1: hoisting the prefabricated I-steel and the steel pipe to a roof, perforating a roof parapet and well protecting the ground;
s2: erecting a cantilever platform main body structure by utilizing prefabricated main beams, forming a cantilever structure by prefabricated I-beams through parapet wall preformed holes, arranging 2 elevation surfaces of the longitudinal and transverse main beams, arranging all longitudinal main beam I-beams on the lower layer, arranging all transverse main beam I-beams on the upper layer, and connecting and fixing the intersections of the longitudinal and transverse I-beams through U-shaped clamps with the diameter of 16, so that the longitudinal main beam I-beams and the transverse main beam I-beam cantilever structure platform are connected into a whole, and anchoring the I-beams and a roof shear wall to improve the stability of the whole platform, thereby completing the welding of the transverse beams and the longitudinal beams;
s3: the method comprises the following steps that after a main beam is checked and accepted, edge-facing channel steel is connected with an overhanging section distribution beam, the edge-facing channel steel and the distribution beam are manually installed by matching of an automobile crane, a cantilever section cross beam is connected with an I-shaped steel beam through a main beam overhanging section connecting plate, the main beam overhanging section connecting plate is fixed at an overhanging section of the steel beam through welding at intervals of 0.4m, the distribution beam connecting plates are fixed at two ends of the distribution beam through welding, and the overhanging section distribution beam is connected with the main beam through bolts;
s4: firstly, transversely placing a 3m multiplied by 2.50m punching steel plate on an overhanging fixed cantilever beam, enabling workers to go out of the punching steel plate, fixing the punching steel plate on a steel beam by using iron wires, increasing an operation surface, then installing side channel steel, sequentially exchanging and moving the punching steel plate, and completing the installation of the side channel steel, the overhanging section distribution beam and the pattern steel plate;
s5: the distributive girder and the main girder are connected by the distributive girder connecting plate, the patterned steel plate is fully paved, and the patterned steel plate and the cross girder are fixed into a whole by self-tapping screws, so that the disassembly and transition after completion are facilitated;
s6: inserting a vertical post of the vertical surface protection into a prefabricated seamless steel pipe support for fixing, arranging three horizontal cross rods in the middle, connecting and fixing a wall connecting rod piece with an original structural post hoop, determining the layout of the third horizontal cross rods according to the height of a dismantling structure, wherein the third horizontal cross rods are not lower than the dismantling structure, arranging a waist blocking rod according to the actually erected height, and arranging a layer of steel plate dense mesh net in an erected vertical surface protection frame after the horizontal rods and the waist blocking rod are erected;
s7: the steel wire rope of an automobile crane or a small cantilever crane is used for stabilizing the concrete block to be removed, the steel wire rope of the lifting hook is tightened and then cut by a wire saw, and the mass of the concrete block cut each time in the cutting process cannot exceed 500kg.
According to the construction method for dismantling the cantilever structure of the high-rise building roof, the prefabricated main beam in the step S2 is customized according to the size of the high-rise building roof and the length of the cantilever structure, the length of the cantilever section needs to be larger than the length of the cantilever structure by 0.5m, and the height of the vertical rod in the vertical surface protection system is higher than the height of the cantilever structure by 0.5m.
The overhanging sections are overhanging outdoors, every two overhanging sections form a group, before the overhanging sections are pushed outwards from the opening, a traction rope is tied on the end, meanwhile, one end of an anti-falling safety net is hung, when the overhanging sections are pushed outwards, the traction rope and the safety net are synchronously released, and after the overhanging sections are in place, the safety net is tensioned to form safety protection. And after the inner section of the building is fixedly installed, installing the cross beam of the platform.
The end of the overhanging I-steel is pre-erected to form a vertical surface protection support when being manufactured, a stand column of the vertical surface protection is fixed in a manner that a round steel pipe is inserted into the reserved support, a horizontal rod is connected with the stand column through a cross fastener, three horizontal rods are arranged, a waist rail is additionally arranged, and after the horizontal rod and the waist rail are erected, a steel plate dense mesh net is laid to complete the vertical surface protection erection.
In the step S2, the prefabricated main beam is fixed with the shear wall into a whole through the distribution room shear wall connecting plate and the chemical bolts, 6 anchoring points are reserved in the shear wall connecting plate and are welded with the side of the I-shaped steel in a surrounding mode, and the shear wall and the I-shaped steel are fixed together through anchoring of the chemical bolts.
According to the construction method for dismantling the cantilever structure of the roof of the high-rise building, before the concrete block is cut in the step S7, carbon fiber cloth is adopted for reinforcement, the carbon fiber cloth is arranged in a full length mode, the lap joint length is not less than 100mm, the primer thickness is not more than 0.4mm, and after the carbon fiber cloth is well adhered, the curing and maintaining time is not less than 3 days.
Generally, compared with the prior art, the technical scheme conceived by the invention can achieve the following beneficial effects:
1. according to the construction method for dismantling the overhanging structure of the high-rise building roof, the overhanging construction platform provides a closed and safe construction site, so that the safety of operators in the construction process is guaranteed, the influence of the construction process on the daily life of residents in a modified community is reduced to the greatest extent, and the coordination work in the construction process is reduced;
2. the construction method reduces the damage of the original structural layer of the roof, reduces the recovery cost of the roof, is convenient for turnover of main components for factory prefabrication, and reduces the resource investment and the material consumption.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a front view of an I-beam of the present invention in connection with a shear wall;
FIG. 2 is a side view of the I-beam of the present invention in connection with a shear wall;
FIG. 3 is a schematic view of the welding of the side channel steel and the longitudinal I-steel according to the present invention;
FIG. 4 is a schematic view of the welding of the edge channel steel and the transverse I-shaped steel according to the present invention; :
FIG. 5 is a schematic view of the position of the connection plate and the joist steel according to the present invention;
FIG. 6 is a schematic connection diagram of the cantilever section channel steel, the prefabricated support and the connecting plate;
FIG. 7 is a schematic view of the welding of the distributor beam to the web according to the present invention;
FIG. 8 is a schematic diagram illustrating the construction platform of the present invention;
in the figure: 1-shear wall connecting plate, 2-anchoring point, 3-longitudinal girder I-steel, 4-transverse girder I-steel, 5-edge channel steel, 6-parapet, 7-girder overhanging section connecting plate, 8-prefabricated seamless steel pipe support, 9-distribution beam and 10-distribution beam connecting plate.
Detailed Description
The invention relates to a construction method for dismantling a roof overhanging structure of a high-rise building, which is characterized in that a safe construction platform and vertical surface safety protection are established on the basis of erecting an independent overhanging platform, so that nondestructive cutting dismantling is realized.
Holes are formed in the parapet wall 6 of the roof in advance according to the specification of selected I-steel, and transverse and longitudinal main beam connecting plates and distribution beam connecting plates 10 are prefabricated, and the front view and the side view of the connection of the I-steel and the shear wall are shown in figures 1 and 2.
The installation of the overhanging platform follows a certain sequence, firstly longitudinal steel beams are installed, then transverse steel beams are installed, then four adjacent edge channel steels 5 and distribution beams 9 of overhanging sections are installed, and after the floor steel beams are all installed and welded, patterned steel plates of the overhanging sections are laid.
The longitudinal girder I-steel 3 and the transverse girder I-steel 4 penetrate through a reserved hole of the parapet wall 6 and are fixed with the shear wall into a whole through the shear wall connecting plate 1 and the chemical bolts, and the steel anchor plate reserves 6 anchoring points 2 and is welded with the side of the I-steel in a surrounding mode and anchored through the chemical bolts to fix the shear wall and the I-steel.
The section of encorbelmenting encorbelments in outdoor, encorbelmenting every two of section and be a set of, follow the entrance to a cave before outwards promoting, at the end system haulage rope, hang the one end of preventing weighing down the safety net simultaneously, when outwards promoting, haulage rope and safety net synchronous release encorbelment the back of targetting in place, take-up safety net forms safety protection, treat and carry out the crossbeam installation of platform again after building inner segment fixed mounting accomplishes.
2 elevation surfaces of longitudinal and transverse two-way I-beams are arranged, all longitudinal girder I-beams 3 are arranged on the lower layer, all transverse girder I-beams 4 are arranged on the upper layer, and the intersection positions of the longitudinal and transverse I-beams are connected and fixed through a U-shaped clamp with the diameter of 16, so that the cantilever structure platforms are connected into a whole, the stability of the platform is improved, and the possibility of slippage is reduced.
The main beam is connected with the edge channel steel 5 and the cantilever section distribution beam 9 after being checked and accepted, the edge channel steel 5 and the distribution beam 9 are installed manually by matching of a truck crane, the cantilever section cross beam is respectively connected with the longitudinal main beam I-steel 3 and the transverse main beam I-steel 4 through the main beam cantilever section connecting plate 7, the main beam cantilever section connecting plate 7 is fixed on the cantilever section of the steel beam through welding at intervals of 0.4 meter, the distribution beam connecting plate 10 is fixed at two ends of the distribution beam 9 through welding, and the cantilever section distribution beam 9 is connected with the main beam through bolts, as shown in figures 3 and 4, the welding schematic diagram of the edge channel steel 5, the longitudinal I-steel 3 and the transverse main beam I-steel 4 is shown.
Firstly, transversely arranging a 3m multiplied by 0.25m punching steel plate on an overhanging fixed overhanging beam, tying the punching steel plate by a hemp rope when the punching steel plate is externally arranged, preventing the punching steel plate from sliding down and falling down, then externally standing on the punching steel plate by workers, fixing the punching steel plate on a steel beam by an iron wire, increasing the working surface, then installing an edge channel steel 5, sequentially exchanging and moving the punching steel plate, and finishing the installation of the edge channel steel 5, the overhanging section distribution beam 9 and a pattern steel plate, as shown in figure 5, the invention has a schematic connection diagram of a connecting plate and a girder I-steel.
The distribution beam 9 is connected with the main beam by the distribution beam connecting plate 10, the patterned steel plate is fully paved, the patterned steel plate and the cross beam are fixed into a whole by self-tapping screws, and the disassembly and transition after completion are convenient, as shown in fig. 6 and 7, a schematic view of the connection relationship of the cantilever distribution beam 9, the prefabricated seamless steel pipe support 8 and the distribution beam connecting plate 10 is shown.
Inserting a vertical column of the vertical surface protection into a prefabricated seamless steel pipe support 8 for fixing, arranging three horizontal cross rods in the middle, connecting and fixing a wall connecting rod piece with an original structural column hoop, determining the layout of the third horizontal cross rods according to the height of a dismantling structure, setting a waist blocking rod according to the actual erection height, and arranging a layer of steel plate dense mesh net inside an erected vertical surface protection frame after the horizontal rods and the waist blocking rod are erected.
The support frame body is established to structure below encorbelmenting outward, and the construction platform that the striking was encorbelmented when preventing to encorbelment the structure and cut off prevents simultaneously that the hydraulic pressure rope saw chain is cliied to pergola roof beam in the cutting from influencing work efficiency.
The support body adopts the steel pipe fastener to set up three rows of support frames, according to encorbelment the structure vertical direction outward arrange vertical horizontal pole, horizontal pole, from construction platform face 0.2m set up indulge horizontal broom pole, set up the three-layer horizontal pole, the structure is encorbelmented outward that the support of third layer horizontal pole waited to demolish, highly according to demolising the structure and set up.
In order to prevent the concrete block from accidentally falling off and injuring people and objects in the dismantling process, anti-falling measures need to be made before dismantling, safe dismantling is guaranteed, a layer of carbon fiber cloth needs to be pasted on the structure in advance before dismantling, the concrete block which is weathered during cutting and hoisting is prevented from falling off, and dismantling can be started after the carbon fiber cloth reinforcing measures are completed.
After a steel wire rope of a standby automobile crane and a concrete block are stabilized, cutting is carried out after a hook steel wire rope needs to be tightened, after the cutting is finished, the steel wire rope is hoisted and transported to the ground by a crane, the mass of the concrete block to be cut each time in the cutting process does not exceed 500kg, and the main beam needs to be weighed during cutting.
When the construction environment does not meet the use conditions of the automobile crane, the small cantilever crane is installed on the steel structure construction platform, the crane is provided with a counter weight to ensure stability, after the steel wire rope of the cantilever crane is stabilized with the concrete block, the steel wire rope of the hook needs to be tightened and then cut, after the cutting is completed, the crane is used for hoisting and transporting the steel wire rope to the roof platform, the steel wire rope is transported to the ground after being crushed, the mass of the cut concrete block in the cutting process does not exceed 500kg at every time, and the crane needs to be weighed during the cutting. As shown in fig. 8, the construction platform of the present invention is completed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A construction method for dismantling a roof cantilever structure of a high-rise building is characterized by comprising the following construction steps:
s1: hoisting the prefabricated I-shaped steel and the steel pipe to the roof, opening a hole in the parapet wall (6) of the roof and well protecting the ground;
s2: the cantilever platform main body structure is built by utilizing a prefabricated girder, the prefabricated I-beams form a cantilever structure through a reserved hole of a parapet (6), 2 elevation surfaces of girders in longitudinal and transverse directions are arranged, all longitudinal girder I-beams (3) are arranged at the lower layer, all transverse girder I-beams (4) are arranged at the upper layer, and the intersections of the longitudinal girder I-beams and the transverse girder I-beams are connected and fixed through a U-shaped clamp with the diameter of 16, so that the cantilever structure platforms of the longitudinal girder I-beams (3) and the transverse girder I-beams (3) are connected into a whole, the I-beams are anchored and connected with a roof shear wall to improve the stability of the whole platform, and the welding of a cross beam and a longitudinal beam is completed;
s3: the main beam is connected with an overhanging section distribution beam (9) through edge-facing channel steel (5) after acceptance check, the edge-facing channel steel (5) and the distribution beam (9) are installed manually by matching with a truck crane, a cantilever section cross beam is connected with an I-shaped steel beam through a main beam overhanging section connecting plate (7), the main beam overhanging section connecting plate (7) is fixed on an overhanging section of the steel beam through welding at intervals of 0.4m, the distribution beam connecting plate (10) is fixed at two ends of the distribution beam (9) through welding, and the overhanging section distribution beam (9) is connected with the main beam through bolts;
s4: firstly, transversely arranging a 3m multiplied by 0.25m punching steel plate on an overhanging fixed cantilever beam, then, externally standing on the punching steel plate by a worker, fixing the punching steel plate on a steel beam by using an iron wire, increasing an operation surface, then, installing adjacent edge channel steel (5), and sequentially exchanging and moving the punching steel plate to complete the installation of the adjacent edge channel steel (5), the overhanging section distribution beam (9) and the pattern steel plate;
s5: the distributing beam (9) is connected with the main beam by the distributing beam connecting plate (10), the patterned steel plate is fully paved, and the patterned steel plate and the cross beam are fixed into a whole by self-tapping screws, so that the finished dismantling and transition are facilitated;
s6: inserting a vertical column of the vertical surface protection into a prefabricated seamless steel pipe support (8) for fixing, arranging three horizontal cross rods in the middle, connecting and fixing a wall connecting rod piece with an original structural column hoop, determining the layout of the third horizontal cross rods according to the height of a dismantling structure, wherein the third horizontal cross rods are not lower than the dismantling structure, arranging a waist blocking rod according to the actually erected height, and arranging a layer of steel plate dense mesh net in the erected vertical surface protection frame after the horizontal rods and the waist blocking rod are erected;
s7: the concrete block to be removed is stabilized by using a steel wire rope of an automobile crane, the steel wire rope of the hook is cut by using a rope saw after being tightened, and the mass of the concrete block cut each time in the cutting process cannot exceed 500kg.
2. The construction method for dismantling the cantilever structure of the roof of the high-rise building according to claim 1, wherein the prefabricated main beam in the step S2 is customized according to the size of the roof of the high-rise building and the length of the cantilever structure, the length of the cantilever structure needs to be greater than the length of the cantilever structure by 0.5m, and the height of an upright in the vertical surface protection system is greater than the height of the cantilever structure by 0.5m.
3. The high-rise building roof cantilever structure dismantling construction method according to claim 1, wherein in the step S2, the prefabricated main beam is fixed with the shear wall into a whole through a distribution room shear wall connecting plate (1) and chemical bolts, 6 anchoring points (2) are reserved in the shear wall connecting plate (1) and are welded with the side of the i-shaped steel in a surrounding mode, and the shear wall and the i-shaped steel are fixed together through chemical bolts in an anchoring mode.
4. The construction method for dismantling the cantilever structure of the roof of the high-rise building according to claim 1, wherein before the concrete block is cut in the step S7, a carbon fiber cloth is adopted for reinforcement, the carbon fiber cloth is arranged in a full length mode, the lap joint length is not less than 100mm, the primer thickness is not more than 0.4mm, and after the carbon fiber cloth is well adhered, the curing and maintaining time is not less than 3 days.
5. The method for dismantling the cantilever structure of the roof of the high-rise building according to claim 1, wherein in the step S7, when the construction environment does not meet the use conditions of an automobile crane, a small cantilever crane is installed on a steel structure construction platform, the crane is provided with a counterweight to ensure stability, after a steel wire rope of the cantilever crane to be used is stabilized with a concrete block, a steel wire rope of a hook needs to be tightened and then cut, after the cutting is completed, the steel wire rope is hoisted to the roof platform by using a crane, and then the roof platform is transported to the ground after being crushed, the mass of the concrete block cut each time in the cutting process does not exceed 500kg, and the crane needs to be weighed during the cutting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211150021.2A CN115478710A (en) | 2022-09-21 | 2022-09-21 | High-rise building roof cantilever structure dismantling construction method |
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| CN202211150021.2A CN115478710A (en) | 2022-09-21 | 2022-09-21 | High-rise building roof cantilever structure dismantling construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116163506A (en) * | 2023-04-18 | 2023-05-26 | 山西建设投资集团有限公司 | Movable construction operation platform for removing chimney |
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2022
- 2022-09-21 CN CN202211150021.2A patent/CN115478710A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116163506A (en) * | 2023-04-18 | 2023-05-26 | 山西建设投资集团有限公司 | Movable construction operation platform for removing chimney |
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