CN109838114B - Reinforced concrete structure reverse dismantling temporary support conversion device and operation method thereof - Google Patents
Reinforced concrete structure reverse dismantling temporary support conversion device and operation method thereof Download PDFInfo
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- CN109838114B CN109838114B CN201910255186.8A CN201910255186A CN109838114B CN 109838114 B CN109838114 B CN 109838114B CN 201910255186 A CN201910255186 A CN 201910255186A CN 109838114 B CN109838114 B CN 109838114B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 49
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
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- 238000010276 construction Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005422 blasting Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
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Abstract
A reinforced concrete structure reverse demolition temporary support conversion device and an operation method thereof belong to the technical field of building reverse demolition. The device comprises a jack, a bearing plate, a short column connecting piece, a supporting short column and L-shaped steel. According to the invention, the jack, the bearing plate, the supporting short columns and the L-shaped steel form the temporary supporting structure, the pair of temporary supporting structures are arranged on two sides of the structural column to replace the vertical bearing capacity transmitted by the structural column, the bearing capacity of the reinforced concrete structural column and the bearing capacity of the structural beam are fully utilized, so that the vertical load is transmitted to the temporary supporting structure through the structural beam, the bearing capacity is reasonably converted, and the safety in the reverse dismantling process is ensured. The support short column is mainly used for bearing vertical load, and the support short column is detachably spliced together and can be reused, so that a part of dismantling cost is reduced. The bearing plate is used for uniformly converting vertical supporting force, so that the effect of vertical supporting is ensured. The force is directly and safely applied through the vertical direct conversion of the force.
Description
Technical Field
The invention belongs to the technical field of reverse demolition of buildings, and particularly relates to a reverse demolition temporary support conversion device of a reinforced concrete structure and an operation method thereof.
Background
At present, the urban building is dismantled to a large extent and is in a reinforced concrete structure, reinforced concrete is generally and traditionally used for mainly mechanical dismantling and blasting dismantling, the manual dismantling is assisted in a dismantling mode, the high-rise building is still dismantled for mainly controlling blasting, and the blasting is dismantled and mechanically dismantled again. These traditional removal methods are more suitable for suburban, or more remote, houses. Construction demolition in areas of small building density in towns or urban areas takes into account the effects on the surrounding environment, including noise generation, dust generation, whether construction is possible at night, and the effects on surrounding traffic, etc. These factors all result in buildings in towns or urban areas that cannot be removed using traditional violence.
Reverse demolishment is from building bottom then from the layer by layer that down upwards demolishs, because the construction plane is on ground all the time in the demolishment process, the security that just so can be better assurance demolishd can be reduced to the apparatus carrying height, accelerates the construction progress simultaneously, can effectually reduce the influence of dust and noise moreover to can be at night operation, the reduction of erection time.
The difficulty in reverse demolition is how to safely transform the vertical support and to allow for more efficient construction. The invention discloses a reverse dismantling structure, which is characterized in that the application number 201810885073.1 is that a reinforced concrete structure reversely dismantles a vertical conversion supporting structure, the stress conversion of the structure is that the bracket is used for lateral conversion, each column on each layer needs to be punched and inserted with a stress member on the upper side column close to a beam during installation, and the lower side also needs to be punched and inserted with a stress member, so that the construction cost is increased, the construction progress is influenced, meanwhile, all the dies are required to be dismantled when the layer is constructed to the last short column, the labor intensity of workers is increased, and the construction progress is also influenced.
There is a need in the art for a new solution to this problem.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the technical problems of high construction cost, high labor intensity of workers and low construction progress of the reverse demolishing structure in the prior art are solved.
The reinforced concrete structure reverse dismantling temporary support conversion device comprises a jack, a bearing plate, a short column connecting piece, a support short column and L-shaped steel, wherein the jack is arranged on two sides of a reinforced concrete structure column, and the upper part of a jacking device of the jack is fixedly connected with the bearing plate; the upper part of the bearing plate is fixedly connected with the supporting short column through a short column connecting piece; the number of the support short columns is plural, the upper parts and the lower parts of the support short columns are fixedly provided with short column connecting pieces, the support short columns are sequentially and fixedly connected to the lower part of the structural beam from bottom to top through the short column connecting pieces, and the support short column at the uppermost part is fixedly connected with the bearing plate through the short column connecting pieces; the upper part of the supporting plate is fixedly connected with the L-shaped steel; two L-shaped steel are symmetrically arranged on the structural beam; the outer side of the bending part of the L-shaped steel is provided with an L-shaped steel bolt opening, one surface of the L-shaped steel is fixedly connected with the bottom surface of the structural beam, the other surface of the L-shaped steel is fixedly connected with the side wall of the structural beam, and the two symmetrically arranged L-shaped steels are fixedly connected through the L-shaped steel bolt opening and the bolts.
The jack is connected with the electronic numerical control equipment, and the electronic numerical control equipment controls the jack to ascend or descend.
The outer surfaces of the bearing plates are rough surfaces.
The cross section of the support short column is round or rectangular.
The operation method for reversely dismantling the temporary support conversion device of the reinforced concrete structure comprises the following steps, which are sequentially carried out,
firstly, selecting a reversely dismantled starting floor according to the tonnage of a jack, dismantling a filling wall and an upper floor slab of the starting floor, and reserving a structural column and a structural beam of the dismantled floor;
symmetrically fixing a pair of L-shaped steel on the lower part and two sides of a structural beam of the demolition floor through an L-shaped steel bolt opening by using a high-strength bolt;
step three, fixedly mounting the jack on the ground or dismantling the upper part of a next floor structure beam of the floor;
fixing a supporting plate on the upper part of the jack, fixing and installing short column connecting pieces on the upper part and the lower part of the supporting short column, and connecting the supporting short column from bottom to top to right below the L-shaped steel by connecting the short column connecting pieces through high-strength bolts;
step five, fixedly connecting the support short columns on the top layer with the lower part of the L-shaped steel through high-strength bolts and bearing plates, and installing temporary support conversion devices on two sides of one structural column;
step six, repeating the step two to the step five until the temporary support conversion devices on both sides of all the structural columns of the demolition floor are installed;
step seven, setting a primary cutting height H on the electronic numerical control equipment, and simultaneously controlling and lifting a lifting device of the jack by the electronic numerical control equipment, wherein the lifting device is higher than the set primary cutting height H;
step eight, dismantling the structural columns of the dismantling floors in two ways, wherein one way is selected from the two ways to dismantle the structural columns;
1. the first dismantling mode is as follows:
(1) the height of the jack is kept unchanged, the temporary support conversion device bears vertical load, and the cutting equipment sequentially cuts the structural columns of the demolished floors at the height H from the bottom end and takes out the cut structural columns;
(2) lowering all jacks to the cutting height;
(3) selecting a structural column, descending a jack on one side of the structural column below a primary cutting height H, removing the uppermost support short column on the upper part of the side jack, and lifting the side jack to a supporting height;
(4) lowering a jack on the other side of the structural column below a primary cutting height H, removing the uppermost support short column on the upper part of the side jack, and lifting the side jack to a supporting height to enable temporary support conversion devices on two sides of the structural column to bear vertical loads;
(5) repeating the step (3) and the step (4) until the whole support short column of the lowest section of the layer is removed;
(6) repeating the steps (1) to (5) to cut the structural column of the layer section by section from bottom to top and remove the supporting short columns section by section from top to bottom, removing the L-shaped steel wrapped on the structural beam while removing the supporting short column of the last section, and reserving a section of the structural column, wherein the reserved height is higher than the height of the jack after the whole jacking device descends;
(7) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam, the structural beam is cut in sections through cutting equipment, and the structural beam is transported out by mechanical equipment;
2. the second dismantling mode is as follows:
(1) the height of the jack is kept unchanged, the temporary support conversion device bears vertical load, and the cutting equipment sequentially cuts the structural columns of the demolished floors at the height H from the bottom end and takes out the cut structural columns;
(2) lowering all jacks to the cutting height;
(3) taking the section of the cut structural column as a temporary vertical supporting load, and dismantling the uppermost support short columns on two sides of all the structural columns;
(4) the electronic numerical control equipment simultaneously controls all jacks to be lifted to the supporting height, so that temporary supporting conversion devices on two sides of the structural column bear vertical loads;
(5) repeating the steps (1) to (4) to cut the structural column of the layer section by section from bottom to top and remove the supporting short columns section by section from top to bottom, removing the L-shaped steel wrapped on the structural beam while removing the supporting short column of the last section, and reserving a section of the structural column, wherein the reserved height is higher than the height of the jack after the whole jacking device descends;
(6) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam, the structural beam is cut in sections through cutting equipment, and the structural beam is transported out by mechanical equipment;
and step nine, repeating the step one to the step eight to finish the dismantling of the whole building.
And in the first step, the tonnage of the lower floor body of the starting floor is larger than that of the jack.
In the first step, the integral tonnage of the building body is smaller than that of the jack, and the initial floor is one layer.
Through the design scheme, the invention has the following beneficial effects:
according to the invention, the jack, the bearing plate, the supporting short columns and the L-shaped steel form the temporary supporting structure, the pair of temporary supporting structures are arranged on two sides of the structural column to replace the vertical bearing capacity transmitted by the structural column, the bearing capacity of the reinforced concrete structural column and the bearing capacity of the structural beam are fully utilized, so that the vertical load is transmitted to the temporary supporting structure through the structural beam, the bearing capacity is reasonably converted, and the safety in the reverse dismantling process is ensured. The support short column is mainly used for bearing vertical load, and the support short column is detachably spliced together and can be reused, so that a part of dismantling cost is reduced. The bearing plate is used for uniformly converting vertical supporting force, so that the effect of vertical supporting is ensured. The force is directly and safely applied through the vertical direct conversion of the force.
The invention has high initial cost, but all the dismantling components can be recycled, so that not only the dismantling cost is reduced, but also the dismantling process risk coefficient can be reduced by working on a low platform, and the dismantling progress is quickened.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
fig. 1 is a schematic structural view of a device for reverse dismantling temporary support conversion device and an operation method thereof for a reinforced concrete structure.
Fig. 2 is a schematic structural view of the reinforced concrete structure reverse dismantling temporary support conversion device and the operation method thereof according to the present invention in an embodiment.
In the figure, the lifting jack is 1-jack, the supporting plate is 2-jack, the connecting piece of the short column is 3-jack, the short column is 4-support, the section steel is 5-L, the section steel is 6-L, the bolt opening is 7-structure column, the section steel is 8-structure beam, and the cutting height is H-one time.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures, which can be embodied in a number of different ways, as defined in the claims.
As shown in the figure, the reinforced concrete structure is reversely dismantled to temporarily support the conversion device, and comprises a jack 1, a bearing plate 2, a short column connecting piece 3, a support short column 4 and L-shaped steel 5. The temporary support conversion device is supported at the bottom of the reinforced concrete structure, which is close to the layer of structural beam 8. The jack 1 is located at the lowest end of the layer of support structure, i.e. connected to the lowest section of support stud 4. The support short columns 4 are mainly used for bearing vertical loads, and the support short columns 4 are detachably spliced together. The pair of L-shaped steel 5 are integrally fixed on the side face and the bottom face of the structural beam 8 respectively from the left and the right of the structural beam 8, and the lower part of the L-shaped steel 5 is connected with the uppermost section of supporting short column 4. The bearing plate 2 is connected below the pair of L-shaped steel 5 and at the joint of the jack 1 and the supporting short column 4 by bolts and is used for uniformly converting vertical supporting force and ensuring the effect of vertical supporting.
The general size of the bearing plate 2 is slightly smaller than the width of the structural beam 8, so that the bearing plate can be more conveniently placed below a pair of L-shaped steel 5, and meanwhile, the bearing plate is used for more uniformly transferring vertical loads from the structural beam 8 to a temporary support conversion device, the outer surface of the bearing plate 2 is a roughened surface, friction force is increased, and support safety is improved.
The jack 1 is controlled by a set of electronic numerical control equipment, and the electronic numerical control equipment can simultaneously and uniformly control the jack 1 of all the layers to lift or control the individual jacks 1 to lift.
The support short columns 4 are mainly used for bearing vertical loads, and the support short columns 4 are detachably spliced together and can be reused, so that a part of dismantling cost is reduced. The support post 4 is usually 0.8m, and the cross section of the support post 4 can be various shapes, generally circular, rectangular, etc. The stub coupling member 3 fixedly couples the support stubs 4 together by means of high strength bolts.
The support post 4, the post connector 3 and the carrier plate 2 are connected together and finally act together with the jack 1 to form a support conversion device.
The L-shaped steel 5 is a thickened steel plate with an L shape, and screw holes reserved in advance are formed in corners of the steel plate and used as L-shaped steel bolt openings 6 for connecting a pair of L-shaped steel bolts, so that force transmission is more uniform. A pair of L-shaped steel 5 is taken to form an integral body from the left and right sides of the structural beam 8 and is fixed on the side face and the bottom face of the structural beam 8, so that the part of the structural beam 8 can be protected from being damaged when vertical load is received, and the bearing plate 2 can be used for replacing stress on the part of the L-shaped steel.
The invention provides a pair of temporary support conversion devices to replace the vertical bearing capacity transferred by the structural columns 7, fully utilizes the bearing capacities of the structural columns 7 and the structural beams 8 of the reinforced concrete structure, transfers the vertical load to the temporary support conversion devices through the structural beams 8, reasonably converts the bearing capacity and ensures the safety in the reverse dismantling process.
This interim support conversion equipment can be when reinforced concrete structure is reverse demolishs, through support short column connecting piece 3 and bearing board and jack 1 with the vertical load conversion of this layer of structural column to a pair of strutting arrangement on, make full use of the bearing capacity of structural beam, make vertical load obtain reasonable conversion, guarantee the security of reverse demolishs in-process reinforced concrete structure.
Examples:
in this embodiment, the temporary support conversion devices are symmetrical pairs, and are respectively arranged at two opposite sides of the layer structure column 7, so that vertical load is reasonably converted, and the safety of the reinforced concrete structure in the reverse dismantling process is ensured.
The bearing plate 2 is a part of the layer of structural beam 8, which is close to the structural column 7, a pair of reserved L-shaped steel bolt openings 6 are reserved at the sides of the corners of the L-shaped steel 5, the L-shaped steel 5 can be fixed on the structural beam 8 through high-strength bolts, on one hand, the bearing plate can be used for dispersing concrete pressure generated by concentrated stress on concrete, on the other hand, the force of vertical load can be enabled to act on the structural beam 8 more uniformly, and in order to save time, of course, the bearing plate 2 can be directly used for dispersing load.
The bearing plate 2 further comprises a bearing plate 2 at the joint of the jack 1 and the supporting short column 4, the bearing plate 2 can be fixed on the supporting short column 4 in a bolt connection mode and the like, so that the bearing capacity of the supporting short column 4 in vertical load transmission can be increased or the jack 1 can more uniformly support the load from the vertical direction.
The temporary support conversion device further comprises a jack 1, the bottom layers of the pair of jacks 1 are positioned on the supporting short columns 4 and are connected with the supporting short columns 4 at the bottom layer, the pair of supporting short columns 4 are arranged below the structural beams 8 beside each layer of structural column 7, the bottom ends of the supporting short columns 4 are numerical control jacks 1, and the tonnage of each jack 1 is determined by the dead weight of the reinforced concrete structure to be dismantled. Through setting up jack 1, can conveniently accomplish the cutting of structural column 7 and support the altitude mixture control of short column 4, guarantee reinforced concrete structure's reverse smooth and the security of demolishing.
All pairs of jacks 1 are controlled by a unified set of numerical control equipment, so that the jacks can be lifted up and fallen down uniformly, and can be lifted up and fallen down singly and freely. The support studs 4 are detachably spliced together. The temporary supports are used for replacing the original structural columns 7, a section of structural columns 7 can be cut off uniformly in the dismantling process, the cutting length is controlled within the maximum height of the lifting of the jack 1, the cut reinforced concrete structural columns 7 can be taken out from the bottom of the columns conveniently, the whole cutting height is limited, then the cut surface of the structural columns 7 is enabled to be in uniform falling to the cut position of the structural columns 7 by the numerical control electronic jack 1, after the cut surface of the structural columns 7 is abutted with the lower cut of the chiseled, the cut structural columns 7 bear loads, then fall back to the jack 1, fall back to the cutting height and then unload the uppermost supporting short columns 4, the supporting short columns 4 are fixedly connected through short column connecting pieces 3 and high-strength bolts, the connecting structural strength between the adjacent supporting short columns 4 can be ensured, and then the supporting plate 2 on the uppermost supporting short columns 4 is installed on the second section supporting short columns 4.
Finally, when the uppermost support short column 4 and the jack 1 are dismounted, the fact that the transmission of force is unstable is considered to cause the unstable transmission of vertical load is considered, in order to ensure the effectiveness of vertical load conversion, in order to ensure the bearing effect of the support short column 4 on the vertical direction of the structural column 7, the uppermost support short column 4 can be dismounted by inserting, then the support plate 2 is mounted, immediately after the jack 1 is lifted back to enable the support short column 4 to be in the same height as the structural column 7 after being cut, and then the next pair of top support short columns 4 are dismounted, so that the construction progress is repeatedly accelerated, the labor, the materials and the mechanical cost are saved, the effectiveness of the vertical force transmission in the dismounting process and the influence of horizontal force possibly generated are ensured, and the safety of reverse dismounting is ensured.
When the reinforced concrete structure is reversely dismantled by using the reinforced concrete structure reverse dismantling temporary support conversion device, the following steps are adopted:
firstly, selecting a reversely dismantled starting floor according to the tonnage of a jack 1, dismantling a filling wall and an upper floor slab of the starting floor, and reserving a structural column 7 and a structural beam 8 of the dismantled floor to prepare for reversely dismantling the reinforced concrete structural beam 8 and the structural column 7;
if the integral tonnage of the building body is larger than the tonnage of the jack 1, selecting an initial floor from the middle floor, wherein the tonnage of the lower-layer building body with the limit selected as the initial floor is larger than the tonnage of the jack 1; the integral tonnage of the building body is smaller than that of the jack 1, and the initial floor is one layer.
And secondly, symmetrically fixing a pair of L-shaped steel 5 on the lower part and two sides of the structural beam 8 of the demolition floor through the L-shaped steel bolt openings 6 by using high-strength bolts.
And thirdly, fixedly mounting the jack 1 on the ground or dismantling the upper part of a next floor structure beam 8 of the floor.
Fixing a bearing plate 2 on the upper part of the jack 1, fixing and installing a short column connecting piece 3 on the upper part and the lower part of a short support column 4, and connecting the short support column 4 to the short support column connecting piece 3 through high-strength bolts, wherein the short support column 4 is sequentially and fixedly connected from bottom to top until the short support column is right below the L-shaped steel 5;
step five, fixedly connecting the support short columns 4 on the top layer with the lower part of the L-shaped steel 5 through high-strength bolts and bearing plates 2, and installing temporary support conversion devices on two sides of one structural column 7;
step six, repeating the step two to the step five until the temporary support conversion devices on both sides of all the structural columns 7 of the demolition floor are installed;
step seven, setting a primary cutting height H on the electronic numerical control equipment, and simultaneously controlling and lifting a lifting device of the jack 1 by the electronic numerical control equipment, wherein the lifting device is slightly higher than the set primary cutting height H;
step eight, the structural columns 7 of the demolishing floors are demolished in two modes, and one mode is selected from the two modes to demolish the structural columns 7;
1. the first dismantling mode is as follows:
(1) the height of the jack 1 is kept unchanged, the temporary support conversion device bears vertical load, and the structural columns 7 of the demolished floors are sequentially cut at the height H from the bottom end by cutting equipment, and the cut structural columns 7 are taken out;
(2) lowering all jacks 1 to the cutting height;
(3) selecting one structural column 7, taking the structural structure into consideration if the structural structure is a statically indeterminate structure, adopting other temporary support conversion devices except for temporary support conversion devices on two sides of the selected structural column 7 to bear vertical load at the moment, lowering the jack 1 on one side of the structural column 7 to be lower than a primary cutting height H, removing the uppermost support short column 4 on the upper part of the side jack 1, and lifting the side jack 1 to the supporting height;
(4) lowering the jack 1 on the other side of the structural column 7 below the primary cutting height H, removing the uppermost support short column 4 on the upper part of the side jack 1, and lifting the side jack 1 to the supporting height to enable the temporary support conversion devices on the two sides of the structural column 7 to bear vertical load;
(5) repeating the step (3) and the step (4) until the lowest section of the support short column 4 of the layer is completely removed;
(6) repeating the steps (1) to (5) to cut the structural columns 7 of the layer section by section from bottom to top and remove the supporting short columns 4 section by section from top to bottom, removing the L-shaped steel 5 wrapped on the structural beam 8 while removing the supporting short columns 4 of the last section, and reserving a section of the structural columns 7, wherein the reserved height is higher than the height of the jack 1 after the whole lifting device descends;
(7) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks 1 to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam 8, the structural beam 8 is cut in sections through cutting equipment, safety and convenience in outward transportation are ensured during cutting, and the structural beam 8 is transported away and loaded by mechanical equipment such as a forklift;
2. the second dismantling mode is as follows:
(1) the height of the jack 1 is kept unchanged, the temporary support conversion device bears vertical load, and the structural columns 7 of the demolished floors are sequentially cut at the height H from the bottom end by cutting equipment, and the cut structural columns 7 are taken out;
(2) lowering all jacks 1 to the cutting height;
(3) taking the fact that the structure is not a statically indeterminate structure into consideration, taking the section of the cut structural column 7 as a temporary vertical supporting load, and removing the uppermost support short columns 4 on two sides of all the structural columns 7;
(4) the electronic numerical control equipment simultaneously controls all jacks 1 to be lifted to the supporting height, so that the temporary supporting conversion devices at two sides of the structural column 7 bear vertical loads;
(5) repeating the steps (1) to (4) to cut the structural columns 7 of the layer section by section from bottom to top and remove the supporting short columns 4 section by section from top to bottom, removing the L-shaped steel 5 wrapped on the structural beam 8 while removing the supporting short columns 4 of the last section, and reserving a section of the structural columns 7, wherein the reserved height is higher than the height of the jack 1 after the whole lifting device descends;
(6) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks 1 to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam 8, the structural beam 8 is cut in sections through cutting equipment, safety and convenience in outward transportation are ensured during cutting, and the structural beam 8 is transported away and loaded by mechanical equipment such as a forklift;
and step nine, repeating the step one to the step eight, wherein the position of the jack 1 is fixed, and the temporary support conversion device is assembled again to finish the dismantling of the whole building. It should be noted that there is a greater number of support studs 4 than the initial storey, since there is a section of structural post 7 left unremoved by the next storey.
Claims (4)
1. Reverse temporary support conversion equipment that demolishs of reinforced concrete structure, characterized by: the lifting device comprises a jack (1), a bearing plate (2), short column connecting pieces (3), supporting short columns (4) and L-shaped steel (5), wherein the jack (1) is arranged on two sides of a reinforced concrete structural column (7), and the upper parts of lifting devices of the jack (1) are fixedly connected with the bearing plate (2); the upper part of the bearing plate (2) is fixedly connected with the supporting short column (4) through the short column connecting piece (3); the number of the support short columns (4) is plural, the upper parts and the lower parts of the support short columns (4) are fixedly provided with short column connecting pieces (3), the support short columns (4) are sequentially and fixedly connected to the lower parts of the structural beams (8) from bottom to top through the short column connecting pieces (3), and the support short columns (4) at the uppermost part are fixedly connected with the bearing plates (2) through the short column connecting pieces (3); the upper part of the supporting plate (2) is fixedly connected with the L-shaped steel (5); two L-shaped steel (5) are symmetrically arranged on the structural beam (8); an L-shaped steel bolt opening (6) is formed in the outer side of the bending part of the L-shaped steel (5), one surface of the L-shaped steel (5) is fixedly connected with the bottom surface of the structural beam (8), the other surface of the L-shaped steel (5) is fixedly connected with the side wall of the structural beam (8), and the two symmetrically arranged L-shaped steels (5) are fixedly connected through the L-shaped steel bolt opening (6) and a bolt;
the jack (1) is connected with electronic numerical control equipment, and the electronic numerical control equipment controls the jack (1) to lift or descend;
the outer surfaces of the supporting plates (2) are rough surfaces;
the cross section of the supporting short column (4) is round or rectangular.
2. The operation method for reversely dismantling the temporary support conversion device by the reinforced concrete structure, which is characterized in that: comprising the following steps, and the following steps are carried out in sequence,
firstly, selecting a reversely dismantled starting floor according to the tonnage of a jack (1), dismantling a filling wall and an upper floor of the starting floor, and reserving a structural column (7) and a structural beam (8) of the dismantled floor;
symmetrically fixing a pair of L-shaped steel (5) on the lower part and two sides of a structural beam (8) of the demolition floor through an L-shaped steel bolt opening (6) by using a high-strength bolt;
step three, fixedly mounting the jack (1) on the ground or dismantling the upper part of a next floor structure beam (8) of the floor;
fixing a bearing plate (2) on the upper part of the jack (1), fixing short column connecting pieces (3) on the upper part and the lower part of a short support column (4), and fixedly connecting the short support column (4) from bottom to top in sequence until the short support column (4) is right below the L-shaped steel (5) through the short support column connecting pieces (3) by high-strength bolts;
step five, fixedly connecting the support short columns (4) on the top layer with the lower part of the L-shaped steel (5) through high-strength bolts and bearing plates (2), and installing temporary support conversion devices on two sides of one structural column (7);
step six, repeating the step two to the step five until the temporary support conversion devices on both sides of all the structural columns (7) of the demolition floor are installed;
step seven, setting a primary cutting height H on the electronic numerical control equipment, and simultaneously controlling and lifting a lifting device of the jack (1) by the electronic numerical control equipment, wherein the lifting device is higher than the set primary cutting height H;
step eight, the structural columns (7) of the demolishing floors are demolished, the demolishing modes are divided into two, and one of the two modes is selected for demolishing the structural columns (7);
1. the first dismantling mode is as follows:
(1) the height of the jack (1) is kept unchanged, the temporary support conversion device bears vertical load, and the structural columns (7) of the demolishd floors are sequentially cut at the height H from the bottom end by cutting equipment and the cut structural columns (7) are taken out;
(2) lowering all jacks (1) to the cutting height;
(3) selecting a structural column (7), lowering a jack (1) at one side of the structural column (7) below a primary cutting height H, removing the uppermost support short column (4) at the upper part of the side jack (1), and then lifting the side jack (1) to a supporting height;
(4) lowering the jack (1) at the other side of the structural column (7) below a primary cutting height H, removing the uppermost support short column (4) at the upper part of the side jack (1), and then lifting the side jack (1) to a supporting height to enable the temporary support conversion devices at the two sides of the structural column (7) to bear vertical loads;
(5) repeating the step (3) and the step (4) until the lowest section of the support short column (4) of the layer is completely dismantled;
(6) repeating the steps (1) to (5) to cut the structural columns (7) of the layer section by section from bottom to top and remove the supporting short columns (4) section by section from top to bottom, removing the L-shaped steel (5) wrapped on the structural beam (8) while removing the supporting short columns (4) of the last section, reserving a section of the structural columns (7), and keeping the reserved height higher than the height of the jack (1) after the lifting device is completely lowered;
(7) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks (1) to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam (8), the structural beam (8) is cut in sections through cutting equipment, and the structural beam (8) is transported out by adopting mechanical equipment;
2. the second dismantling mode is as follows:
(1) the height of the jack (1) is kept unchanged, the temporary support conversion device bears vertical load, and the structural columns (7) of the demolishd floors are sequentially cut at the height H from the bottom end by cutting equipment and the cut structural columns (7) are taken out;
(2) lowering all jacks (1) to the cutting height;
(3) taking the section of the cut structural column (7) as a temporary vertical supporting load, and dismantling the uppermost support short columns (4) on two sides of all the structural columns (7);
(4) the electronic numerical control equipment simultaneously controls all jacks (1) to be lifted to the supporting height, so that temporary supporting conversion devices at two sides of the structural column (7) bear vertical loads;
(5) repeating the steps (1) to (4) to cut the structural columns (7) of the layer section by section from bottom to top and remove the supporting short columns (4) section by section from top to bottom, removing the L-shaped steel (5) wrapped on the structural beam (8) while removing the supporting short columns (4) of the last section, reserving a section of the structural columns (7), and keeping the reserved height higher than the height of the jack (1) after the lifting device is completely lowered;
(6) the electronic numerical control equipment simultaneously controls the jacking devices of all jacks (1) to descend to the lowest point, solid wood cushion blocks or steel cushion blocks are placed at the lower part of the structural beam (8), the structural beam (8) is cut in sections through cutting equipment, and the structural beam (8) is transported out by adopting mechanical equipment;
and step nine, repeating the step one to the step eight to finish the dismantling of the whole building.
3. The method for operating a device for reverse demolishing a reinforced concrete structure, according to claim 2, characterized in that: the tonnage of the lower floor body of the initial floor in the step one is larger than that of the jack (1).
4. The method for operating a device for reverse demolishing a reinforced concrete structure, according to claim 2, characterized in that: in the first step, the integral tonnage of the building body is smaller than the tonnage of the jack (1), and the initial floor is one layer.
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