CN110439319B - Collapse prevention method for reversely dismantling high-rise concrete building structure - Google Patents
Collapse prevention method for reversely dismantling high-rise concrete building structure Download PDFInfo
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- CN110439319B CN110439319B CN201910777463.1A CN201910777463A CN110439319B CN 110439319 B CN110439319 B CN 110439319B CN 201910777463 A CN201910777463 A CN 201910777463A CN 110439319 B CN110439319 B CN 110439319B
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- E04G23/08—Wrecking of buildings
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Abstract
The invention discloses a collapse prevention method for reversely demolishing a high-rise concrete building structure, relates to the field of reversely demolishing buildings, and particularly relates to a collapse prevention method for reversely demolishing a high-rise concrete building structure. The invention aims to solve the problem that a building structure is easy to collapse under the action of wind load and earthquake in the reverse dismantling process. The method comprises the following steps: a cast-in-place reinforced concrete cylinder or a large-section solid column with a certain height is arranged in the elevator shaft in a rear mode, and a gap between the cylinder walls of the inner shaft and the outer shaft is filled with a plug block, so that lateral rigidity resistance and lateral bearing capacity resistance can be provided for a building structure in the reverse dismantling process, and collapse of an upper-layer reinforced concrete building structure under the action of wind load and earthquake in the reverse dismantling process is effectively avoided. The invention can avoid the collapse of the building structure in the reverse demolition process and provides safety guarantee for the reverse demolition.
Description
Technical Field
The invention relates to the field of reverse demolition of buildings, in particular to a collapse prevention method for reverse demolition of a high-rise concrete building structure.
Background
The technology of building demolition on one floor by applying a jacking system, a vertical conversion device and an anti-collapse method is called reverse demolition technology. The reverse demolition technology is suitable for demolition of dense buildings in cities and towns. When reversely dismantling, firstly dismantling the decoration, the filler wall, the suspension, the elevator and the like, and then dismantling the vertical members and the floor system of each layer of the building on one layer. However, after the vertical members such as columns and shear walls of a building are dismantled by using a reverse dismantling technology, the building structure is easy to collapse under the action of wind load and earthquake in the reverse dismantling process.
Disclosure of Invention
The invention aims to solve the problem that a building structure is easy to collapse under the action of wind load and earthquake in the reverse demolition process, and provides a collapse prevention method for reversely demolishing a high-rise concrete building structure.
A collapse prevention method for reversely demolishing a high-rise concrete building structure is specifically carried out according to the following steps:
firstly, determining the wind load in the dismantling period according to 10-year meeting, and determining the earthquake action in the dismantling period according to the exceeding probability of 2% in 5 years; according to wind load and earthquake action, calculating and determining the section size, reinforcing bars and height of the rear shaft according to the principle that the deformation of the rear shaft and the deformation of the elevator shaft at the elevation position at the top of the rear shaft are consistent;
secondly, reliably planting bars on the base top of the elevator shaft along the inner side of the elevator shaft;
thirdly, binding reinforcing steel bars of the rear shaft, respectively arranging permanent templates on the inner side and the outer side of a reinforcing steel bar framework of the rear shaft, and pouring concrete of the rear shaft to a preset height;
fourthly, when the reverse demolition of the building to be demolished is carried out, the method comprises the following steps: firstly, an L-shaped chock block and an inner right-angle double-L chock block are plugged at the top of a rear shaft, the L-shaped chock block and the inner right-angle double-L chock block are removed after single dismantling is completed, and the L-shaped chock block and the inner right-angle double-L chock block are reset again after a building to be dismantled descends;
fifthly, repeating the first step in the fourth step until the height of the elevator shaft is lower than that of the rear shaft;
sixthly, when the height of the elevator shaft is lower than that of the rear shaft, the method comprises the following steps: secondly, the top of the elevator shaft is filled with an L-shaped chock block and an outer right-angle double-L chock block to fill the gap between the elevator shaft and the rear shaft, reverse demolition is continuously carried out, the L-shaped chock block and the outer right-angle double-L chock block are removed when single demolition is completed, and the gap between the elevator shaft and the rear shaft is filled with the L-shaped chock block and the outer right-angle double-L chock block again at the top of the elevator shaft after the whole demolition building descends;
and seventhly, repeating the second step in the sixth step until the whole building to be dismantled is completely dismantled.
The invention has the beneficial effects that:
according to the invention, the cast-in-place reinforced concrete cylinder or the large-section solid column with a certain height is arranged in the elevator shaft, and the gap between the cylinder walls of the inner shaft and the outer shaft is filled with the chock block, so that the lateral stiffness and the lateral bearing capacity are provided for the building structure in the reverse dismantling process, the collapse of the high-rise reinforced concrete building structure under the action of wind load and earthquake in the reverse dismantling process is effectively avoided, and the safety guarantee is provided for the reverse dismantling.
Drawings
Fig. 1 is a schematic diagram of the relative positions of parts of an elevator shaft above a rear shaft;
fig. 2 is a schematic diagram of the relative positions of parts of an elevator shaft below a rear shaft;
FIG. 3 is a schematic structural view of an L-shaped chock;
FIG. 4 is a schematic structural view of an inner right angle double L-shaped chock;
fig. 5 is a structural schematic diagram of an outer right-angle double-L chock.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and the collapse prevention method for reversely demolishing the high-rise concrete building structure of the embodiment specifically comprises the following steps:
firstly, determining the wind load in the dismantling period according to 10-year meeting, and determining the earthquake action in the dismantling period according to the exceeding probability of 2% in 5 years; according to wind load and earthquake action, calculating and determining the section size, reinforcing bars and height of the rear shaft 2 according to the principle that the rear shaft 2 and the elevator shaft 1 deform at the elevation position at the top of the rear shaft 2 in a consistent manner;
secondly, reliably planting bars on the base top of the elevator shaft 1 along the inner side of the elevator shaft 1;
thirdly, binding reinforcing steel bars of the rear shaft 2, respectively arranging permanent templates on the inner side and the outer side of a reinforcing steel bar framework of the rear shaft 2, and pouring concrete of the rear shaft 2 to a preset height;
fourthly, when the reverse demolition of the building to be demolished is carried out, the method comprises the following steps: firstly, an L-shaped chock block 3 and an inner right-angle double-L chock block 4 are plugged at the top of a rear shaft 2, the L-shaped chock block 3 and the inner right-angle double-L chock block 4 are removed after single dismantling is completed, and the L-shaped chock block 3 and the inner right-angle double-L chock block 4 are reset again after a building to be dismantled descends;
fifthly, repeating the first step in the fourth step until the height of the elevator shaft 1 is lower than that of the rear shaft 2;
sixthly, when the height of the elevator shaft 1 is lower than that of the rear shaft 2, the method comprises the following steps: secondly, the gap between the elevator shaft 1 and the rear shaft 2 is filled by the L-shaped chock 3 and the outer right-angle double-L chock 5 at the top of the elevator shaft 1, reverse demolition is continuously carried out, the L-shaped chock 3 and the outer right-angle double-L chock 5 are removed when single demolition is completed, and the gap between the elevator shaft 1 and the rear shaft 2 is filled by the L-shaped chock 3 and the outer right-angle double-L chock 5 at the top of the elevator shaft 1 again after the whole demolition building descends;
and seventhly, repeating the second step in the sixth step until the whole building to be dismantled is completely dismantled.
The embodiment ensures that the reinforced concrete high-rise building structure does not collapse in the process of reverse demolition under the action of wind load and earthquake.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: and step two, the base top of the elevator shaft 1 is a raft foundation or a piled raft foundation. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: and step three, the permanent template is a plastic template or a reactive powder concrete template. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: fourthly, the thickness of one side of the L-shaped chock 3 is the net distance between the rear shaft 2 and the wall of the elevator shaft 1. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the elevator shaft 1, the rear shaft 2, the L-shaped chock blocks 3, the inner right-angle double-L chock blocks 4 and the outer right-angle double-L chock blocks 5 jointly provide lateral rigidity resistance and lateral bearing capacity resistance for a building to be dismantled. The rest is the same as one of the first to fourth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows: a collapse prevention method for reversely demolishing a high-rise concrete building structure is specifically carried out according to the following steps:
firstly, determining the wind load in the dismantling period according to 10-year meeting, and determining the earthquake action in the dismantling period according to the exceeding probability of 2% in 5 years; according to wind load and earthquake action, calculating and determining the section size, reinforcing bars and height of the rear shaft 2 according to the principle that the rear shaft 2 and the elevator shaft 1 deform at the elevation position at the top of the rear shaft 2 in a consistent manner;
secondly, reliably planting bars on the base top of the elevator shaft 1 along the inner side of the elevator shaft 1;
thirdly, binding steel bars of the rear shaft 2, and respectively arranging permanent templates on the inner side and the outer side of a steel bar framework of the rear shaft 2; pouring concrete of the rear shaft 2 to a preset height;
fourthly, when the reverse demolition of the building to be demolished is carried out, the method comprises the following steps: firstly, an L-shaped chock block 3 and an inner right-angle double-L chock block 4 are plugged at the top of a rear shaft 2, the L-shaped chock block 3 and the inner right-angle double-L chock block 4 are removed after single dismantling is completed, and the L-shaped chock block 3 and the inner right-angle double-L chock block 4 are reset again after a building to be dismantled descends;
fifthly, repeating the first step in the fourth step until the height of the elevator shaft 1 is lower than that of the rear shaft 2;
sixthly, when the height of the elevator shaft 1 is lower than that of the rear shaft 2, the method comprises the following steps: secondly, the gap between the elevator shaft 1 and the rear shaft 2 is filled by the L-shaped chock 3 and the outer right-angle double-L chock 5 at the top of the elevator shaft 1, reverse demolition is continuously carried out, the L-shaped chock 3 and the outer right-angle double-L chock 5 are removed when single demolition is completed, and the gap between the elevator shaft 1 and the rear shaft 2 is filled by the L-shaped chock 3 and the outer right-angle double-L chock 5 at the top of the elevator shaft 1 again after the whole demolition building descends;
and seventhly, repeating the second step in the sixth step until the whole building to be dismantled is completely dismantled.
This embodiment is at the cast-in-place reinforced concrete section of thick bamboo or the solid post of big cross-section of certain height of postposition in the elevator pit shaft to with the clearance of chock stopper solid between inside and outside pit shaft section of thick bamboo wall, provide anti side rigidity and anti side bearing capacity for reverse building structure who demolishs the in-process, effectively avoid reverse demolishs the collapse of in-process high-rise reinforced concrete building structure under wind load and earthquake effect, provide the safety guarantee for reverse demolishment.
Claims (5)
1. The collapse prevention method for reversely demolishing the high-rise concrete building structure is characterized by comprising the following steps of:
firstly, determining the wind load in the dismantling period according to 10-year meeting, and determining the earthquake action in the dismantling period according to the exceeding probability of 2% in 5 years; according to wind load and earthquake action, calculating and determining the section size, reinforcing bars and height of the rear shaft (2) according to the principle that the rear shaft (2) and the elevator shaft (1) deform at the elevation of the top of the rear shaft (2) in a consistent manner;
secondly, reliably planting bars on the base top of the elevator shaft (1) along the inner side of the elevator shaft (1);
thirdly, binding steel bars of the rear shaft (2), and arranging permanent templates on the inner side and the outer side of a steel bar framework of the rear shaft (2); pouring concrete of the rear shaft (2) to the height of the rear shaft (2) determined in the step one;
fourthly, when the reverse demolition of the building to be demolished is carried out, the method comprises the following steps: firstly, an L-shaped chock block (3) and an inner right-angle double-L chock block (4) are plugged at the top of a rear shaft (2), the L-shaped chock block (3) and the inner right-angle double-L chock block (4) are removed after single dismantling is finished, and the L-shaped chock block (3) and the inner right-angle double-L chock block (4) are reset again after a building to be dismantled descends;
fifthly, repeating the first step in the fourth step until the height of the elevator shaft (1) is lower than that of the rear shaft (2);
sixthly, when the height of the elevator shaft (1) is lower than that of the rear shaft (2), the method comprises the following steps: secondly, filling a gap between the elevator shaft (1) and the rear shaft (2) with an L-shaped plug block (3) and an outer right-angle double-L plug block (5) at the top of the elevator shaft (1), continuously performing reverse demolition, removing the L-shaped plug block (3) and the outer right-angle double-L plug block (5) when finishing single demolition, and filling the gap between the elevator shaft (1) and the rear shaft (2) with the L-shaped plug block (3) and the outer right-angle double-L plug block (5) at the top of the elevator shaft (1) again after the whole demolition building descends;
and seventhly, repeating the second step in the sixth step until the whole building to be dismantled is completely dismantled.
2. The collapse prevention method for reverse demolition of a high-rise concrete building structure according to claim 1, wherein the foundation top of the elevator shaft (1) in the second step is a raft foundation or a piled raft foundation.
3. The collapse prevention method for reverse demolition of a high-rise concrete building structure according to claim 1, wherein the permanent form in step three is a plastic form or a reactive powder concrete form.
4. The collapse prevention method for the reverse demolition of the high-rise concrete building structure according to claim 1, characterized in that in the step four, the thickness of one side of the L-shaped chock (3) is the net distance between the rear shaft (2) and the shaft wall of the elevator shaft (1).
5. The collapse prevention method for reverse demolition of a high-rise concrete building structure according to claim 1, characterized in that the elevator shaft (1), the rear shaft (2), the L-shaped chock (3), the inner right-angle double-L chock (4) and the outer right-angle double-L chock (5) jointly provide lateral rigidity and lateral bearing capacity for the building to be demolished.
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| CN110439319B true CN110439319B (en) | 2021-05-07 |
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| CN111794134A (en) * | 2020-07-29 | 2020-10-20 | 建研科技股份有限公司 | Reverse dismantling and core-pulling conversion device for reinforced concrete structure and construction method |
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| JP5285850B2 (en) * | 2006-10-19 | 2013-09-11 | 株式会社竹中工務店 | Seismic isolation repair method and seismic isolation device insertion method |
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| CN105484498A (en) * | 2016-01-04 | 2016-04-13 | 中国建筑第八工程局有限公司 | Anti-slurry-leakage construction method of core tube wall |
| CN107642251A (en) * | 2017-09-20 | 2018-01-30 | 江山（福建）建设工程有限公司 | A kind of high-rise cast-in-place concrete building demolition construction method |
| CN109838114A (en) * | 2019-04-01 | 2019-06-04 | 吉林建筑大学 | Reinforced concrete structure inversely removes temporary support conversion equipment and its operating method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107740596A (en) * | 2017-11-30 | 2018-02-27 | 中建三局第建设工程有限责任公司 | A kind of non-open cut Demolition Construction method of underground structure being drilled into |
| CN108678423B (en) * | 2018-08-06 | 2023-12-08 | 中建研科技股份有限公司 | Vertical conversion supporting structure is demolishd in reverse direction to reinforced concrete structure |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5285850B2 (en) * | 2006-10-19 | 2013-09-11 | 株式会社竹中工務店 | Seismic isolation repair method and seismic isolation device insertion method |
| CN105442866A (en) * | 2014-08-28 | 2016-03-30 | 上海宝冶集团有限公司 | Protective dismantle and assembly method for large-scale towering steel structures |
| CN105484498A (en) * | 2016-01-04 | 2016-04-13 | 中国建筑第八工程局有限公司 | Anti-slurry-leakage construction method of core tube wall |
| CN107642251A (en) * | 2017-09-20 | 2018-01-30 | 江山（福建）建设工程有限公司 | A kind of high-rise cast-in-place concrete building demolition construction method |
| CN109838114A (en) * | 2019-04-01 | 2019-06-04 | 吉林建筑大学 | Reinforced concrete structure inversely removes temporary support conversion equipment and its operating method |
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