CN110439318B - Vertical conversion method for reverse demolition of existing building - Google Patents

Vertical conversion method for reverse demolition of existing building Download PDF

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Publication number
CN110439318B
CN110439318B CN201910777462.7A CN201910777462A CN110439318B CN 110439318 B CN110439318 B CN 110439318B CN 201910777462 A CN201910777462 A CN 201910777462A CN 110439318 B CN110439318 B CN 110439318B
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frame
supporting steel
dismantling
steel beam
layer
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CN110439318A (en
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郑子玥
郑文忠
许崇浩
王英
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/08Wrecking of buildings

Abstract

The invention discloses a vertical conversion method for reversely dismantling an existing building, relates to the field of building dismantling, and particularly relates to a construction method for reversely dismantling the existing building by utilizing vertical conversion. The invention aims to solve the problems that the existing vertical bearing members which cannot be simultaneously cut off in the reverse dismantling process have long dismantling period. The method fully considers the characteristic that the shearing-resistant bearing capacity of the normal section of the end of the frame beam is far higher than that of the oblique section, and the vertical load of the column is borne by the steel beam supported by the screw rod arranged on the lower side of the frame beam on the side surface of the column, so that the vertical load borne by the column is borne by the screw rod in the process of reversely dismantling the vertical component. The invention can replace the original vertical bearing member of the building to bear the weight in the reverse dismantling process, thereby ensuring the safety in the dismantling process.

Description

Vertical conversion method for reverse demolition of existing building
Technical Field
The invention relates to the field of building demolition, in particular to a construction method for reversely demolishing an existing building by utilizing vertical conversion.
Background
The technology for completing the building demolition at one floor by means of the lifting and lifting system is called reverse demolition technology, and the reverse demolition technology is suitable for demolition of dense buildings in cities and towns. In the reverse dismantling process, an appropriate vertical conversion device is required to replace the original vertical bearing member of the building so as to ensure the safety in the dismantling process. At present, a jack supported below a column is mainly used for replacing an original column for bearing in the reverse dismantling process, so that in order to ensure that the vertical load can still be effectively transferred when the vertical member of a building is cut off, all columns in the same layer cannot be cut off simultaneously during dismantling, only part of columns can be cut off one by one and the corresponding jacks are lifted for supporting, and the dismantling period is long.
Disclosure of Invention
The invention aims to solve the problems that vertical bearing members which cannot be simultaneously cut off in the existing reverse demolition process are long in demolition construction period, and provides a vertical conversion method for reverse demolition of an existing building.
The vertical conversion method for reversely dismantling the existing building is specifically carried out according to the following steps:
firstly, determining the vertical load borne by a single frame column by the existing building structure to be dismantled by the shearing-resistant bearing capacity of the normal sections of the ends of the frame beams of several layers; selecting two opposite side surfaces with large direct shear bearing capacity of the frame column and each layer of frame beam as support positions for arranging the screw rods and the bearing steel beams; the length of the screw rod is not lower than the corresponding height of the floor; the bearing capacity of the supporting steel beam is not less than the bearing capacity of the right section of the beam end of the frame beam;
drilling four circular holes in the floor area where the frame columns are located, enabling four screw rods to respectively penetrate through the circular holes, the supporting steel beams arranged on the lower surface of each layer of frame beams and the locking nuts arranged below the supporting steel beams from top to bottom, and enabling the locking nuts to be anchored and supported on the base top through large nuts;
synchronously rotating a locking nut below the supporting steel beam to enable the supporting steel beam to be in close contact with the bottom surface of the supported frame beam;
fourthly, removing a certain length of the frame column, wherein the length is greater than the height of the jack but not greater than the maximum stroke of the oil cylinder of the height of the jack;
fifthly, arranging a jack in the frame column dismantling section, delivering oil by the jack, supporting the lower end face of the partially dismantled frame column by an oil cylinder to separate a supporting steel beam from the bottom face of the supported frame beam, synchronously rotating all locking nuts downwards to the length extended out by the oil cylinder, and enabling the supporting steel beam to descend along with the locking nuts;
sixthly, returning oil by the jack, retracting the extended oil cylinder, moving away from the jack, and continuously removing a section of the frame column, wherein the length of the section is the extended length of the oil cylinder;
seventhly, repeating the fifth step and the sixth step in sequence until all the layered frame columns are dismantled;
and eighthly, dismantling the floor system with the layers of the frame columns and the frame beams removed completely, and dismantling layer by layer according to the steps to finally finish the reverse dismantling of the existing building.
The invention has the beneficial effects that:
the invention not only utilizes the jack supported below the column to replace the original column to bear the weight, but also utilizes the screw and the supporting steel beam to bear the weight, and can simultaneously cut off and remove all columns in the same layer, thereby effectively saving the construction period and ensuring the safe reverse dismantling.
Drawings
FIG. 1 is a schematic view showing the relative positions of a screw, a supporting steel beam, a frame column and a frame beam;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic structural diagram of the frame column after being removed by a certain length in the fourth step;
FIG. 4 is a schematic structural view of the fifth step of placing the jack on the frame column after removing the section;
FIG. 5 is a schematic structural view of the fifth step of synchronously rotating all the lock nuts downward to the length of the protruding cylinder;
FIG. 6 is a schematic structural diagram of the jack after oil return in the sixth step;
FIG. 7 is a schematic structural diagram of the sixth step after a section of the frame column is removed;
FIG. 8 is a schematic view of the vertical conversion system with the lowest locking nut removed and the steel support beam removed;
FIG. 9 is a schematic view of the vertical transition system at each level of the top of the screw when the lowest layer of lock nuts and supporting steel beams are removed.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 9, and the vertical conversion method for reverse demolition of an existing building of the embodiment specifically includes the following steps:
firstly, determining the vertical load borne by a single frame column 2 by the existing building structure to be dismantled by the shearing-resistant bearing capacity of the beam-end normal section of the frame beams 3 of several layers; selecting two opposite side surfaces of the frame column 2 and each layer of frame beam 3 with large direct shear bearing capacity as supporting positions for arranging the screw rods 1 and the supporting steel beams 4; the length of the screw rod 1 is not less than the corresponding height of the floor; the bearing capacity of the supporting steel beam 4 is not less than the bearing capacity of the right section of the beam end of the frame beam;
drilling four circular holes in the floor area where the frame columns 2 are located, enabling four screw rods 1 to respectively penetrate through the circular holes, the supporting steel beams 4 arranged on the lower surface of each layer of frame beam 3 and the locking nuts 5 arranged below the supporting steel beams 4 from top to bottom, and enabling the four screw rods to be anchored and supported on a base top through large nuts 6;
thirdly, synchronously rotating a locking nut 5 below the supporting steel beam 4 to ensure that the supporting steel beam 4 is tightly contacted with the bottom surface of the supported frame beam 3;
fourthly, removing a certain length of the frame column 2, wherein the length is greater than the height of the jack 7 but not greater than the maximum stroke of the oiling cylinder 8 at the height of the jack 7;
placing a jack 7 in the frame column 2 dismantling section, delivering oil to the jack 7, supporting the lower end face of the partially dismantled frame column 2 by an oil cylinder to separate the supporting steel beam 4 from the bottom face of the frame beam 3 supported by the supporting steel beam, synchronously rotating all the locking nuts 5 downwards to the length extended by the oil cylinder 8, and enabling the supporting steel beam 4 to descend along with the locking nuts 5;
sixthly, returning oil by the jack 7, retracting the extended oil cylinder 8, moving away the jack 7, and continuously removing a section of the frame column 2, wherein the length of the section is the length extended by the oil cylinder 8;
seventhly, repeating the fifth step and the sixth step in sequence until all the layered frame columns 2 are dismantled;
and eighthly, dismantling the floor system on which the frame columns 2 and the frame beams 3 are completely removed, and dismantling layer by layer according to the steps to finally finish the reverse dismantling of the existing building.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: step one, the selection of the material, the section and the size of the supporting steel beam 4 is based on the principle that the bearing capacity of the supporting steel beam 4 is not less than the bearing capacity of the beam-end normal section of the supporting frame beam 3. 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 in the first step, the sum of the beam end normal section shear bearing capacity of the frame beams 3 with the determined number of layers is larger than the vertical load of the frame column 2. 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: when constructed to the frame beam 3, can be directly removed without special treatment. 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: when the bottom surface of a certain layer of frame beam 3 is removed, the screw rod 1 is lifted, the supporting steel beam 4 at the upper part of the layer of frame beam 3 is moved to the top surface of the layer of frame beam 3, the screw rod 1 is suspended on the top surface of the supporting steel beam 4 by fixing the locking nut 5, the locking nut 5 and the supporting steel beam 4 at the lower part of the layer of frame beam 3 are removed, the screw rod 1 is supported on the base, and the supporting steel beam 4 at the upper part is reset. 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: the vertical conversion method for reversely dismantling the existing building is specifically carried out according to the following steps:
firstly, determining the vertical load borne by a single frame column 2 by the existing building structure to be dismantled by the shearing-resistant bearing capacity of the beam-end normal section of the frame beams 3 of several layers; selecting two opposite side surfaces of the frame column 2 and each layer of frame beam 3 with large direct shear bearing capacity as supporting positions for arranging the screw rods 1 and the supporting steel beams 4; the length of the screw rod 1 is not less than the corresponding height of the floor; the bearing capacity of the supporting steel beam 4 is not less than the bearing capacity of the right section of the beam end of the frame beam;
drilling four circular holes in the floor area where the frame columns 2 are located, enabling four screw rods 1 to respectively penetrate through the circular holes, the supporting steel beams 4 arranged on the lower surface of each layer of frame beam 3 and the locking nuts 5 arranged below the supporting steel beams 4 from top to bottom, and enabling the four screw rods to be anchored and supported on a base top through large nuts 6;
thirdly, synchronously rotating a locking nut 5 below the supporting steel beam 4 to ensure that the supporting steel beam 4 is tightly contacted with the bottom surface of the supported frame beam 3;
fourthly, removing a certain length of the frame column 2, wherein the length is greater than the height of the jack 7 but not greater than the maximum stroke of the oiling cylinder 8 at the height of the jack 7;
placing a jack 7 in the frame column 2 dismantling section, delivering oil to the jack 7, supporting the lower end face of the partially dismantled frame column 2 by an oil cylinder to separate the supporting steel beam 4 from the bottom face of the frame beam 3 supported by the supporting steel beam, synchronously rotating all the locking nuts 5 downwards to the length extended by the oil cylinder 8, and enabling the supporting steel beam 4 to descend along with the locking nuts 5;
sixthly, returning oil by the jack 7, retracting the extended oil cylinder 8, moving away the jack 7, and continuously removing a section of the frame column 2, wherein the length of the section is the length extended by the oil cylinder 8;
seventhly, repeating the fifth step and the sixth step in sequence until all the layered frame columns 2 are dismantled;
and eighthly, dismantling the floor system on which the frame columns 2 and the frame beams 3 are completely removed, and dismantling layer by layer according to the steps to finally finish the reverse dismantling of the existing building.
The invention not only utilizes the jack supported below the column to replace the original column to bear the weight, but also utilizes the screw and the supporting steel beam to bear the weight, and can simultaneously cut off and remove all columns in the same layer, thereby effectively saving the construction period and ensuring the safe reverse dismantling.

Claims (4)

1. A vertical conversion method for reverse demolition of an existing building is characterized by comprising the following steps:
firstly, determining the vertical load borne by a single frame column (2) by the existing building structure to be dismantled by the shearing-resistant bearing capacity of the beam end normal section of the frame beams (3) of several layers; selecting two opposite side surfaces with large direct shear bearing capacity of the frame column (2) and each layer of frame beam (3) as support positions for arranging the screw rod (1) and the bearing steel beam (4); the length of the screw (1) is not less than the corresponding height of the floor; the bearing capacity of the supporting steel beam (4) is not less than the bearing capacity of the right section of the beam end of the frame beam;
drilling four circular holes in a floor area where the frame columns (2) are located, enabling four screw rods (1) to respectively penetrate through the circular holes, the supporting steel beams (4) arranged on the lower surface of each layer of frame beam (3) and the locking nuts (5) arranged below the supporting steel beams (4) from top to bottom, and anchoring and supporting the supporting steel beams and the locking nuts on a base top through large nuts (6);
synchronously rotating a locking nut (5) below the supporting steel beam (4) to enable the supporting steel beam (4) to be in close contact with the bottom surface of the supported frame beam (3);
fourthly, removing a certain length of the frame column (2), wherein the length is greater than the height of the jack (7) but not greater than the maximum stroke of the oil filling cylinder (8) at the height of the jack (7);
placing a jack (7) in a frame column (2) dismantling section, delivering oil to the jack (7), supporting the lower end face of the partially dismantled frame column (2) by an oil cylinder, separating a supporting steel beam (4) from the bottom face of a frame beam (3) supported by the supporting steel beam, synchronously rotating all locking nuts (5) downwards to the length extended by the oil cylinder (8), and descending the supporting steel beam (4) along with the locking nuts (5);
sixthly, returning oil by the jack (7), retracting the extending oil cylinder (8), moving away from the jack (7), and continuously removing a section of the frame column (2), wherein the length of the section is the extending length of the oil cylinder (8);
seventhly, repeating the fifth step and the sixth step in sequence until all the layered frame columns (2) are dismantled;
eighthly, dismantling the floor system with the layers of the frame columns (2) and the frame beams (3) removed completely, and dismantling layer by layer according to the steps to finally finish the reverse dismantling of the existing building;
when the bottom surface of a certain layer of frame beam (3) is dismounted, the screw rod (1) is lifted, the supporting steel beam (4) at the upper part of the layer of frame beam (3) is moved to the top surface of the layer of frame beam (3), the screw rod (1) is suspended on the top surface of the supporting steel beam (4) by fixing the locking nut (5), the locking nut (5) and the supporting steel beam (4) at the lower part of the layer of frame beam (3) are dismounted, the screw rod (1) is supported on the base top, and the supporting steel beam (4) at the upper part is reset.
2. A method of vertical conversion for reverse demolition of an existing building according to claim 1, characterized in that the material, section and dimensions of the supporting steel beam (4) in step one are selected according to the principle that the bearing capacity of the supporting steel beam (4) is not less than the normal section bearing capacity of the beam end of the supported frame beam (3).
3. The vertical conversion method for the reverse demolition of the existing building according to claim 1, characterized in that the sum of the beam end normal section shear bearing capacities of the frame beams (3) of the determined number of floors in the step one is larger than the vertical load of the frame columns (2).
4. A vertical conversion method for reverse demolition of an existing building according to claim 1, characterized in that it is directly removed without special treatment when constructing to the frame beams (3).
CN201910777462.7A 2019-08-22 2019-08-22 Vertical conversion method for reverse demolition of existing building Active CN110439318B (en)

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Publication number Priority date Publication date Assignee Title
CN113863715B (en) * 2021-10-13 2022-10-04 中国建筑第八工程局有限公司 Building structure reverse-operation demolition method and building structure reverse-operation demolition auxiliary equipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2608614Y (en) * 2003-03-21 2004-03-31 成志全 Early disassembling fully suspended supporting bracket
JP2016079759A (en) * 2014-10-22 2016-05-16 前田建設工業株式会社 Method and device for demolishing high-rise building
CN207260635U (en) * 2017-09-30 2018-04-20 江苏速捷模架科技有限公司 Separate type adjustable supports structure
CN108049656A (en) * 2017-12-27 2018-05-18 山东省建筑科学研究院 A kind of the reverse of chimney removes device and method for dismounting
CN108868193A (en) * 2018-07-27 2018-11-23 建研科技股份有限公司 The construction method that steel building is inversely removed
CN208578354U (en) * 2018-06-07 2019-03-05 国网冀北电力有限公司张家口供电公司 Remove wall height-adjustable support device
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2608614Y (en) * 2003-03-21 2004-03-31 成志全 Early disassembling fully suspended supporting bracket
JP2016079759A (en) * 2014-10-22 2016-05-16 前田建設工業株式会社 Method and device for demolishing high-rise building
CN207260635U (en) * 2017-09-30 2018-04-20 江苏速捷模架科技有限公司 Separate type adjustable supports structure
CN108049656A (en) * 2017-12-27 2018-05-18 山东省建筑科学研究院 A kind of the reverse of chimney removes device and method for dismounting
CN208578354U (en) * 2018-06-07 2019-03-05 国网冀北电力有限公司张家口供电公司 Remove wall height-adjustable support device
CN108868193A (en) * 2018-07-27 2018-11-23 建研科技股份有限公司 The construction method that steel building is inversely removed
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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