CN115538817B - Dismantling system for high-rise building cantilever structure and construction method - Google Patents
Dismantling system for high-rise building cantilever structure and construction method Download PDFInfo
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- CN115538817B CN115538817B CN202211524288.3A CN202211524288A CN115538817B CN 115538817 B CN115538817 B CN 115538817B CN 202211524288 A CN202211524288 A CN 202211524288A CN 115538817 B CN115538817 B CN 115538817B
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- E—FIXED CONSTRUCTIONS
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- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- E—FIXED CONSTRUCTIONS
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- 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
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Abstract
The invention discloses a dismantling system and a construction method for a high-rise building overhanging structure, belonging to the technical field of dismantling of overhanging structures, wherein the system comprises a top truss, a semi-overhanging floor group, an upright post and a temporary reinforcing support; the semi-cantilever floor group sequentially comprises a first floor unit, a second floor unit and a third floor unit from top to bottom, wherein the third floor unit comprises a 8230A and an Nth floor unit, and each floor unit comprises a lower support section and an upper cantilever section; the temporary reinforcing support is arranged in the second floor unit and comprises a series of inclined strut steel beams; the upright column comprises a hanging column and a supporting column; bracing steel beams are arranged between the adjacent side supporting columns and between the side supporting columns and the adjacent hanging columns and between the adjacent hanging columns. The temporary reinforcing support is arranged in the second floor unit, the grid structure is formed in the second floor unit together with the upright posts to replace a top truss to become a new rooting point of the lower floor unit, and meanwhile, the first floor unit is supported, so that the stress stability of the structure is ensured, and safety accidents caused by the instability of the structure are avoided.
Description
Technical Field
The invention belongs to the technical field of cantilever structure dismantling, and particularly relates to a dismantling system and a construction method for a cantilever structure of a high-rise building.
Background
The generation of the overhanging structure has great influence on the artistic modeling of modern buildings and endows the modern buildings with strong artistic expressive force, and the overhanging structure is gradually used as a main means of the modeling of the modern buildings and is often used for important parts such as cornices, outer balconies, porches and the like. In many cases, the use of cantilevered structures allows the building to have open space, and the building space is further extended. Meanwhile, under the continuous updating of the construction technology, the overhanging scale and the application mode have new breakthroughs, the high-rise building and the overhanging structure are fused, the vertical face model of the high-rise building is increased, and the high-rise building with the overhanging structure is gradually increased along with the gradual improvement of the construction method.
When the large-span cantilever structure is reconstructed and dismantled, and a top truss and a cantilever structure upright post which are used as suspension points need to be dismantled, the top truss is taken as a rooting point for the lower cantilever part, and the bottom of the lower cantilever part is not supported, so that the stress structure of the lower cantilever part can be influenced by dismantling the top truss, and the construction risk of structural collapse exists; demolish the in-process of encorbelmenting the structure stand, very easily to the cause disturbance of primary structure, influence the stability of structure, simultaneously, the demolishment of stand also can change the structure atress, because the stiff end of the structure of encorbelmenting has great overturning moment, in case the stand is demolishd improperly, will lead to the circumstances such as local structure unstability, have great construction risk, consequently encorbelment the structure transformation and demolish the in-process, need carry out a large amount of calculations and safeguard procedures, lead to the construction procedure complicated, the structure of encorbelmenting demolishs the efficiency of construction lower.
Disclosure of Invention
The invention aims to provide a dismantling system and a construction method for an overhanging structure of a high-rise building, and aims to solve the problems of great potential safety hazard, complex construction and low construction efficiency in the process of dismantling the overhanging structure in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a demolition system for a cantilever structure of a high-rise building comprises a top truss, a semi-cantilever floor group, upright posts and a temporary reinforcing support; the top truss and the semi-cantilever floor group are arranged at the top of the building structure from top to bottom, the upright column is arranged on the semi-cantilever floor group, and the temporary reinforcing support and the upright column are connected to form a grid structure together;
the semi-cantilever floor group sequentially comprises a first floor unit, a second floor unit and a third floor unit from top to bottom, wherein the first floor unit, the second floor unit and the third floor unit are (8230) ('8230)', and the Nth floor unit is provided, and each floor unit comprises a lower support section and an upper cantilever section;
the temporary reinforcing support is arranged in the second floor unit and comprises a series of inclined strut steel beams;
the upright column comprises a hanging column and a supporting column; the support columns are arranged on the lower support section at intervals and comprise common support columns and side support columns; the suspension posts are arranged on the upper cantilever section at intervals; and diagonal bracing steel beams are arranged between the adjacent side supporting columns, between the side supporting columns and the adjacent hanging columns and between the adjacent hanging columns.
Furthermore, the diagonal bracing steel beam is of an I-shaped steel structure and is connected with the upright post in a welding mode.
Furthermore, a temporary jack is arranged on the third floor unit corresponding to the position of the side supporting column to be detached, the temporary jack comprises a jack and a supporting pipe, and the supporting pipe is arranged on the jack.
Furthermore, the jack is provided with a reading device, and the supporting tube is a square steel tube.
A construction method of a dismantling system for a cantilever structure of a high-rise building comprises the following steps:
step one, installing a temporary reinforcing support in a second floor unit;
step two, sequentially dismantling a hanging column of an overhanging section on the first floor unit and a to-be-dismantled side supporting column;
step three, dismantling a top truss;
step four, sequentially removing hanging columns from the third floor unit to the Nth floor unit;
fifthly, sequentially removing the third floor unit to the edge supporting column to be removed on the Nth floor unit;
step six, installing a temporary jack in the third floor unit;
removing the temporary reinforcing support on the second floor unit;
and step eight, sequentially dismantling the hanging columns of the second floor unit and the side supporting columns to be dismantled.
Further, in the first step, the method for installing the diagonal-bracing steel beam for temporary reinforcing support includes the following steps:
(1) Dismantling the partition wall and the pipeline which hinder the reinforcing construction, removing the fireproof coating on the connecting position of the upright post and the inclined strut steel beam, and polishing the fireproof coating smoothly;
(2) The diagonal bracing steel beam is transported to a position to be installed;
(3) Lifting lugs are arranged on the diagonal bracing steel beams, the lifting lugs are welded on the lower flange of the existing beam between the two vertical columns, the diagonal bracing steel beams are lifted to a specified height and angle through a chain block, and temporary fixation is performed;
(4) Welding the inclined strut steel beam with the upright post;
(5) And painting the surfaces of the diagonal bracing steel beam and the upright post.
Furthermore, in the first step, the peripheral diagonal bracing steel beam is installed firstly, and then the inner side diagonal bracing steel beam is installed.
Further, the method for dismantling the upright post comprises the following steps:
(1) Fixing the upright post by using a chain block;
(2) Chamfering the upper opening of the upright column, and dismantling by adopting a flame cutting mode, wherein the cutting position is 50cm away from the steel beam;
(3) Beveling the lower opening of the upright post, and removing by adopting a flame cutting mode, wherein the cutting position is 50cm away from the floor slab;
(4) Slowly laying down the upright post, and then hoisting and transporting away by using a tower crane.
Further, in the seventh step, the dismantling sequence of the steel beams of the inclined strut is opposite to the installing sequence in the first step.
Furthermore, before the upright post is dismantled, whether the stiffening ribs in the upright post meet the requirements of original drawing paper is verified, and if not, the stiffening ribs are supplemented by using a steel plate and then the upright post is continuously dismantled.
The invention has the following beneficial effects:
1. according to the dismantling system and the construction method for the cantilever structure of the high-rise building, the temporary reinforcing support is arranged in the second floor unit, the grid structure is formed in the second floor unit together with the upright column, the top truss is replaced to become a new root point of the lower floor unit, the dismantling of the top truss is facilitated, meanwhile, the first floor unit is supported, the stress stability of the structure is guaranteed, and safety accidents caused by structural instability are avoided.
2. The invention provides a dismantling system and a construction method for a high-rise building overhanging structure.
3. According to the dismantling system and the construction method for the cantilever structure of the high-rise building, provided by the invention, the series of diagonal bracing steel beams are welded and connected with the upright posts, so that the structure is simple, the connection is stable, the operation is convenient, a new construction idea is provided for dismantling all the cantilever structures, and the dismantling system and the construction method have wide reference values.
Drawings
FIG. 1 is a schematic structural view of a top truss and semi-overhanging floor set in accordance with the present invention;
FIG. 2 is a schematic view of the installation of a temporary reinforcing support according to the present invention;
fig. 3 is a schematic view illustrating installation of a diagonal bracing steel beam according to the present invention.
In the figure: 1-top truss, 2-half cantilever floor group, 3-upright post, 31-hanging post, 32-supporting post, 4-temporary reinforcing support and 41-inclined strut steel beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the demolition system and the construction method for the cantilever structure of the high-rise building provided by the invention include a top truss 1, a semi-cantilever floor group 2, an upright post 3 and a temporary reinforcing support 4, wherein the top truss 1 and the semi-cantilever floor group 2 are arranged at the top of the building structure from top to bottom, the upright post 3 is arranged on the semi-cantilever floor group 2, the temporary reinforcing support 4 and the upright post 3 are connected together to form a grid structure, and the temporary support is carried out in the process of demolishing the cantilever structure.
The upright column 3 comprises a hanging column 31 and a supporting column 32; the support columns 32 are arranged on the lower support section at intervals, and the floor slab of the lower support section is connected with the bottom of the building structure step by step through the support columns 32; the suspension posts 31 are arranged on the upper cantilever section at intervals, and the floor slab of the upper cantilever section is connected with the top truss 1 step by step through the suspension posts 31; the top truss 1 is taken as a rooting point by the hanging column 31; the support columns 32 include common support columns and edge support columns arranged adjacent to the upper cantilever section.
The temporary reinforcing support 4 is arranged in the second floor unit, namely, is separated from the top truss 1 by one floor unit and comprises a series of inclined strut steel beams 41, the inclined strut steel beams 41 are preferably I-shaped steel structures, adjacent side support columns are connected through the inclined strut steel beams 41 and are connected with the adjacent hanging columns 31 through the inclined strut steel beams 41, the adjacent hanging columns 31 are connected through the inclined strut steel beams 41, the support columns 32 and the hanging columns 31 jointly form a grid structure, and temporary support is performed in the cantilever structure dismantling process. The inclined strut steel beam 41 is connected with the hanging column 31 and the support column 32 by welding.
The cantilever structure is modified and dismantled, when a new column of the modified structure is superposed with a partial side supporting column of the original structure, the top truss 1, the suspension column 31 of the upper cantilever section and the superposed side supporting column need to be dismantled, and for convenience of description, the side supporting column superposed with the new column is collectively called as a side supporting column to be dismantled. Because the upper cantilever section takes the top truss 1 as a rooting point, the structural safety of each floor unit is influenced by removing the top truss 1, the invention provides a construction method for removing a high-altitude cantilever structure, which comprises the following steps:
step one, installing a temporary reinforcing support 4 in a second floor unit, and installing the peripheral inclined strut steel beam 41 firstly and then installing the inner inclined strut steel beam 41, wherein the installation method of the inclined strut steel beam 41 specifically comprises the following steps:
1) Dismantling partition walls, pipelines and the like which obstruct the reinforcing construction, then removing the fireproof paint at the connecting position of the upright post 3 and the inclined strut steel beam 41, and polishing the fireproof paint smoothly;
2) Transporting the diagonal bracing steel beam 41 to a position to be installed;
3) Lifting lugs are arranged at 1/3 of the upward inclined end of the diagonal bracing steel beam 41, the lifting lugs are welded on the lower flange of the existing beam between the two upright columns 3, a chain block is placed on the lifting lugs, a hook of the chain block is used for hooking the lifting lugs on the diagonal bracing steel beam 41, and the diagonal bracing steel beam 41 is lifted to a specified height and angle through chain block and is temporarily fixed;
4) Welding the inclined strut steel beam 41 with the upright post 3; when the length of the diagonal bracing steel beam 41 is long and the weight is large, the diagonal bracing steel beam 41 can be constructed in sections, namely the diagonal bracing steel beam 41 is divided into a plurality of construction section beams, the construction section beam of the diagonal bracing steel beam 41 positioned at the top end is welded with the upright post 3, and then the subsequent construction section beams are sequentially butted;
5) Painting the surfaces of the diagonal bracing steel beam 41 and the upright post 3;
step two, sequentially dismantling the hanging post 31 of the overhanging section of the first floor unit and the side supporting post to be dismantled, wherein the dismantling method of the upright post 3 comprises the following specific steps:
1) Fixing the upright post 3 by using a chain block;
2) Beveling the upper opening of the upright post 3, cutting the upper opening at a position 50cm away from the steel beam, and cutting by using propane oxygen flame;
3) Beveling the lower opening of the upright post 3, cutting the lower opening at a position 50cm away from the floor slab, and cutting by using propane oxygen flame;
4) Slowly laying down the upright posts 3, then hoisting and transporting away by using a tower crane, wherein the maximum weight of each section of the cut upright posts 3 is not more than 5 tons, and when the maximum weight of each section of the cut upright posts 3 exceeds 5 tons, performing sectional cutting;
step three, dismantling the top truss 1, dismantling the roof structure firstly, then dismantling the top truss 1, and hoisting and transporting away by using a tower crane after dismantling is finished;
step four, sequentially dismantling the hanging columns 31 from the third floor unit to the Nth floor unit from top to bottom, and after dismantling is completed, hoisting and transporting away by using a tower crane;
fifthly, sequentially dismantling the side supporting columns to be dismantled on the third floor unit to the Nth floor unit from top to bottom, and hoisting and transporting away by using a tower crane after dismantling is finished;
installing a temporary jack in the third floor unit, wherein the temporary jack is arranged corresponding to the side supporting column to be removed and comprises a jack and a supporting pipe, the supporting pipe is arranged on the jack, the jack is provided with a reading device, and the supporting pipe is a square steel pipe;
step seven, dismantling the temporary reinforcing supports 4 on the second floor unit, wherein the dismantling sequence of the inclined strut steel beams 41 is opposite to the installation sequence in the step one for convenience of transportation;
and step eight, sequentially dismantling the hanging columns 31 of the second floor unit and the side supporting columns to be dismantled.
After the steps are completed, the subsequent structure can be transformed and unloaded.
When the floor unit includes a plurality of sections of encorbelmenting on, the stand 3 of the section of encorbelmenting on the difference can be demolishd in step, each other does not influence, when nevertheless every stand 3 demolishs, need verify in the 3 interior stiffening rib of original structure stand whether accord with original drawing requirement, if do not accord with original drawing requirement, should stop demolishing, use the steel sheet to continue to demolish after supplementing to report supervision, construction unit.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A demolition system for a cantilever structure of a high-rise building is characterized by comprising a top truss (1), a semi-cantilever floor group (2), an upright post (3) and a temporary reinforcing support (4); the top truss (1) and the semi-cantilever floor group (2) are arranged at the top of the building structure from top to bottom, the upright columns (3) are arranged on the semi-cantilever floor group (2), and the temporary reinforcing supports (4) and the upright columns (3) are connected to form a grid structure together;
the semi-cantilever floor group (2) sequentially comprises a first floor unit, a second floor unit, a third floor unit, a fourth floor unit and a fifth floor unit from top to bottom, wherein each floor unit comprises a lower supporting section and an upper cantilever section;
the temporary reinforcing support (4) is arranged in the second floor unit and comprises a series of inclined strut steel beams (41);
the upright post (3) comprises a hanging post (31) and a supporting post (32); the support columns (32) are arranged on the lower support section at intervals and comprise common support columns and edge support columns; the suspension posts (31) are arranged on the upper cantilever section at intervals; and diagonal bracing steel beams (41) are arranged between adjacent side supporting columns, between the side supporting columns and adjacent hanging columns (31) and between adjacent hanging columns (31).
2. The demolition system for a high-rise building overhanging structure according to claim 1, wherein the bracing steel beam (41) is an i-steel structure and is welded to the column (3).
3. The demolition system for a tall building overhanging structure according to claim 1, wherein a temporary jack is provided on the third floor unit at a position corresponding to the side-supporting column to be demolished, the temporary jack comprising a jack and a support pipe, the support pipe being provided on the jack.
4. A demolition system for a tall building overhanging structure according to claim 3 wherein the jack is provided with a reading device and the support tube is a square steel tube.
5. A construction method of a demolition system for an overhanging structure of a high-rise building according to any one of claims 1 to 4, comprising the steps of:
step one, installing a temporary reinforcing support (4) in a second floor unit;
step two, sequentially dismantling a suspension post (31) of the overhanging section on the first floor unit and a side supporting post to be dismantled;
step three, dismantling the top truss (1);
step four, sequentially dismantling the hanging columns (31) from the third floor unit to the Nth floor unit;
fifthly, sequentially removing the third floor unit to the side supporting columns to be removed on the Nth floor unit;
step six, installing a temporary jack in the third floor unit;
seventhly, dismantling the temporary reinforcing support (4) on the second floor unit;
and step eight, sequentially removing the hanging columns (31) of the second floor unit and the side supporting columns to be removed.
6. The construction method of a demolition system for an overhanging structure of a high-rise building according to claim 5, wherein the installation method of the diagonal-bracing steel beam (41) of the temporary reinforcing brace (4) in the first step comprises the steps of:
(1) Dismantling the partition wall and the pipeline which obstruct the reinforcing construction, removing the fireproof paint at the connecting position of the upright post (3) and the diagonal bracing steel beam (41), and polishing smoothly;
(2) The diagonal bracing steel beam (41) is transported to a position to be installed;
(3) Lifting lugs are arranged on the diagonal bracing steel beams (41), the lifting lugs are welded on the lower flange of the existing beam between the two upright columns (3), the diagonal bracing steel beams (41) are lifted to a specified height and angle through a chain block, and the diagonal bracing steel beams are fixed temporarily;
(4) Welding the inclined strut steel beam (41) with the upright post (3);
(5) Painting the surfaces of the diagonal bracing steel beam (41) and the upright post (3).
7. The construction method of a demolition system for an overhanging structure of a high-rise building according to claim 5, wherein the first step is to install the peripheral diagonal steel beams (41) and then install the inner diagonal steel beams (41).
8. A construction method of a demolition system for a high-rise building overhanging structure according to claim 5, characterized in that the demolition method of the column (3) comprises the steps of:
(1) Fixing the upright post (3) by using a chain block;
(2) The upper opening of the oblique cutting upright post (3) is dismantled by adopting a flame cutting mode, and the cutting position is 50cm away from the steel beam;
(3) The lower opening of the oblique cutting upright post (3) is dismantled by adopting a flame cutting mode, and the cutting position is 50cm away from the floor slab;
(4) The upright post (3) is slowly laid down and then lifted and carried away by a tower crane.
9. The construction method of a demolition system for an overhanging structure of a high-rise building according to claim 7, wherein the demolition order of the diagonal-bracing steel beams (41) in the seventh step is opposite to the installation order thereof in the first step.
10. A construction method of demolition system for cantilever structure of high-rise building according to claim 5 characterized in that before demolition of the columns (3), it is verified whether the stiffeners in the columns (3) meet the requirements of original paper, if not, the demolition is continued after using steel plate for augmentation.
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| CN104929364B (en) * | 2015-07-06 | 2017-03-22 | 广东省第四建筑工程有限公司 | Auxiliary construction method for longspan cantilever entire laminated Vierendeel truss structure |
| CN107806182A (en) * | 2017-11-10 | 2018-03-16 | 虞温乐 | A kind of multilayer cantilever steel construction and its constructive method |
| CN110158988A (en) * | 2019-06-28 | 2019-08-23 | 中冶建工集团有限公司 | A kind of building protection steel structure support and its quick method for dismounting |
| CN111021779B (en) * | 2019-12-19 | 2023-03-31 | 中建钢构工程有限公司 | Integral descending and dismantling construction method for space net rack and auxiliary supporting mechanism |
| CN114961334B (en) * | 2022-05-11 | 2023-08-18 | 北京市第三建筑工程有限公司 | High-altitude large-span overhanging structure closed protection dismantling system and construction method thereof |
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