JP2024117092A - Floor frame lifting system, method for dismantling a structure, and method for constructing a structure - Google Patents

Abstract

To provide a floor frame lifting system that enables the construction and dismantling of buildings in a short construction period even when there are no supporting columns above the floor surface.
[Solution] A building demolition system 2 raises and lowers a crane 21 along a temporary pillar 90. The building demolition system 2 includes a temporary pillar 90 installed on the floor surface of the rooftop floor, a crane installation floor 20 that supports the crane 21, a reaction member 41 engaged with the upper end of the temporary pillar 90, and a strand jack 43 attached to the reaction member 41 and raising and lowering the crane installation floor 20. The temporary pillar 90 includes a base portion 91 temporarily fixed on the floor surface, and a first pillar portion 92 and a second pillar portion 93 extending upward from the base portion 91 and formed by connecting a plurality of pillar members 921, 931 that are retaining members.
[Selection] Figure 14

Description

The present invention relates to a floor frame lifting system, a method for dismantling a structure using this floor frame lifting system, and a method for constructing a structure using this floor frame lifting system.

Conventionally, existing buildings have been demolished due to deterioration of their facilities and structures. There are the following methods for demolishing these existing buildings:
For example, Patent Documents 1 and 2 disclose a demolition system for dismantling an existing structure. The demolition system includes a crane installation floor on which a crane is installed, a support column which is an existing column supporting the crane installation floor, and a lifting device which lowers the crane installation floor along the support column. When dismantling an existing structure, the lifting device is driven to lower the crane installation floor and temporarily support it on the support column, and the existing structure is dismantled in order from the upper layer to the lower layer.

Patent No. 6508958 Patent No. 6893136

The present invention aims to provide a floor frame lifting system, a method for dismantling a structure, and a method for constructing a structure, which enable the construction and dismantling of buildings in a short period of time, even when there are no supporting columns on the floor surface.

The floor frame lifting system of the first invention (e.g., building demolition system 2 and building construction system 4 described later) is a floor frame lifting system that lifts and lowers a floor frame (e.g., crane installation floor 20 described later) along a temporary column (e.g., temporary column 90, 90A described later), and is characterized in that it comprises a temporary column installed on a floor surface, the floor frame, a reaction member (e.g., reaction member 41, 41A described later) engaged with the upper end of the temporary column, and a lifting jack (e.g., strand jack 43 described later) attached to the reaction member and lifting and lowering the floor frame, and the temporary column comprises a base part (e.g., base part 91 described later) temporarily fixed on the floor surface, and a column part (e.g., first column part 92, second column part 93 described later) extending upward from the base part and connecting multiple steel beams (e.g., column members 921, 931 described later).

According to this invention, by temporarily fixing temporary columns onto the floor surface and having the floor frame supported by these temporary columns, even in cases where there are no support columns to support the floor frame, such as on the rooftop floor of a building, a floor frame system can be installed and the construction and demolition of a building can be carried out in a short construction period.
In addition, since the column section of the temporary pillar is constructed by connecting multiple steel beams, the temporary pillar can be easily dismantled and repurposed, thereby reducing construction costs.

The second invention is a method for demolishing a structure (e.g., existing building 1 described below) using the floor frame lifting system described above (e.g., building demolition system 2 described below), and includes a first step (e.g., step S1 described below) of temporarily fixing at least four of the temporary columns to the floor surface, attaching reaction members to the upper ends of the temporary columns, and temporarily supporting the floor frame on the temporary columns; a second step (e.g., step S2 described below) of disassembling the structure into predetermined floors; and The method is characterized by comprising a third step (e.g., steps S3 to S5 described below) of releasing the temporary support of the floor frame, lowering the floor frame along the temporary columns using the lifting jack device, and then temporarily supporting the floor frame on the temporary columns again; a fourth step (e.g., step S6 described below) of removing the upper part of the temporary columns and lifting and repositioning the reaction member downward; and a fifth step (e.g., step S7 described below) of repeating steps 2 to 4.

According to this invention, when demolishing a structure, for example, temporary columns are temporarily fixed on the floor surface of the rooftop floor, and a floor frame on which a crane is installed is temporarily supported by these temporary columns, and the floor frame is lowered along the temporary columns while the structure is demolished with the crane. Therefore, by installing a floor frame lifting system on the floor surface, the building can be demolished in a short construction period.

The method for constructing a structure according to the third invention is a method for constructing a structure (e.g., Building 3 described below) using the floor frame lifting system described above (e.g., Building Construction System 4 described below), and includes a first step (e.g., Step S11 described below) of temporarily fixing at least four of the temporary columns to the floor surface, attaching reaction members to the upper ends of the temporary columns, and temporarily supporting the floor frame on the temporary columns; a second step (e.g., Step S12 described below) of constructing the structure for a predetermined number of floors; The method is characterized by comprising a third step (e.g., step S13 described below) of extending the floor frame toward the temporary pillars and lifting and repositioning the reaction member upward; a fourth step (e.g., steps S14 to S16 described below) of releasing the temporary support of the floor frame by the temporary pillars and using the lifting jack device to raise the floor frame along the temporary pillars so that the floor frame is temporarily supported by the temporary pillars again; and a fifth step (e.g., step S17 described below) of repeating steps 2 to 4.

According to this invention, when constructing a structure, temporary columns are temporarily fixed on the floor surface of a specified floor, and a floor frame on which a crane is installed is temporarily supported by these temporary columns, and the floor frame is raised along the temporary columns while the structure is constructed with the crane. Therefore, a floor frame lifting system can be installed on the floor surface, and a building can be constructed in a short construction period.

The present invention provides a floor frame lifting system, a method for dismantling a structure, and a method for constructing a structure, which enable the construction and dismantling of buildings in a short period of time, even when there are no supporting columns on the floor surface.

1 is a side view of a building demolition system to which a floor frame lifting system according to a first embodiment of the present invention is applied. FIG. 2 is a plan view of the building demolition system according to the first embodiment. FIG. 2 is an enlarged view of a portion of the building construction system shown in FIG. 1 surrounded by dashed line A. FIG. 4 is a view of the building construction system of FIG. 3 taken along the line II. FIG. 2 is a horizontal cross-sectional view of the building construction system of FIG. 3 along line II-II. FIG. 3 is a horizontal cross-sectional view of the building construction system taken along line III-III of FIG. FIG. 2 is a schematic diagram showing the operation of a lifting device constituting the building construction system according to the first embodiment. FIG. 1 is a schematic diagram (part 1) showing the operation of a locking device constituting the building construction system according to the first embodiment. FIG. 2 is a schematic diagram (part 2) showing the operation of the locking device constituting the building construction system according to the first embodiment. FIG. 6 is an enlarged view of a portion (vibration prevention device) surrounded by a dashed line B in the building construction system of FIG. 5 . FIG. 2 is a plan view showing the operation of the vibration prevention device constituting the building construction system according to the first embodiment. 1 is a flowchart of a procedure for demolishing an existing building using the building demolition system according to the first embodiment. FIG. 1 is an explanatory diagram (part 1) of the procedure for demolishing a building using the building demolition system according to the first embodiment. FIG. 2 is a side view of a temporary pillar used when demolishing a building in the building demolition system according to the first embodiment. 15 is a cross-sectional view of the temporary pillar taken along line IV-IV of FIG. 14. 15 is a cross-sectional view of the temporary pillar shown in FIG. 14 along the line VV. FIG. 2 is a side view of the cross portion of the temporary pillar according to the first embodiment. VI-VI cross-sectional view of the cross portion of the temporary pillar according to the first embodiment. FIG. FIG. 2 is an explanatory diagram (part 2) of the procedure for demolishing a building using the building demolition system according to the first embodiment. FIG. 5 is a side view of a building construction system according to a second embodiment of the present invention. 13 is a diagram showing the operation of a lifting device constituting a building construction system according to a second embodiment. FIG. FIG. 11 is an explanatory diagram of a procedure for constructing a building using the building construction system according to the second embodiment. FIG. 11 is an explanatory diagram (part 1) of a procedure for constructing a building using the building construction system according to the second embodiment. FIG. 11 is an explanatory diagram (part 2) of the procedure for constructing a building using the building construction system according to the second embodiment.

The present invention is a floor frame lifting system that lifts and lowers a floor frame along temporary columns 90, 90A that are temporarily fixed to a floor surface of a rooftop floor, etc. The temporary columns 90, 90A include a base portion 91 that is temporarily fixed to a floor surface of a rooftop floor, etc., and column portions 92, 93 that extend upward from the base portion 91 (see Figures 14 to 18).
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same components are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
First Embodiment
Fig. 1 is a side view of a building demolition system 2 to which a floor frame lifting system according to a first embodiment of the present invention is applied. Fig. 2 is a plan view of the building demolition system 2.
The building demolition system 2 is for demolishing an existing building 1 as a structure. The existing building 1 to be demolished is a rigid-frame building that is rectangular in plan view. The existing building 1 includes a number of existing columns 11, a number of existing steel-framed beams 12, and an existing floor 13 made of reinforced concrete. Some of the existing columns 11 are support columns 11A that support a crane installation floor 20.
Hereinafter, the longitudinal direction of this existing building 1 (building demolition system 2) is defined as the X direction, and the transverse direction substantially perpendicular to this X direction is defined as the Y direction.

This existing building 1 is demolished using the following building demolition system 2.
The building demolition system 2 includes a crane installation floor 20 as a floor frame arranged above a floor to be demolished of the existing building 1, a crane 21 installed on the crane installation floor 20, a lifting device 22 attached to the support column 11A and lifting and lowering the crane installation floor 20 along the support column 11A, a locking device 23 provided on the crane installation floor 20 and capable of locking with the upper surface of the joint part 15 (see FIG. 6) of the support column 11A, and a vibration prevention device 24 (see FIG. 5) that suppresses horizontal vibration of the crane installation floor 20, i.e., prevents vibration. In this embodiment, there are six support columns 11A, and the lifting device 22, the locking device 23, and the vibration prevention device 24 are provided for each of the support columns 11A.

The crane installation floor 20 comprises a plurality of H-shaped steel beam members 30 that connect the lifting devices 22 together, and a plate-shaped floor member 31 (shown with diagonal lines in Figure 2) that is a covering plate placed on these beam members 30.
The crane 21 comprises a base 32 formed by erecting steel materials in a crane mounting floor 20 in a crane installation configuration, a mast 33 erected on the base 32, a crane body 34 rotatably supported on the mast 33, a jib 35 supported on the crane body 34 so that it can be raised and lowered, a hook (not shown) suspended from the tip of the jib 35, and a hoisting device 36 attached to the crane body 34 for raising and lowering the hook.

Fig. 3 is an enlarged view of a portion of the building demolition system 2 in Fig. 1 surrounded by a dashed line A. Fig. 4 is a view taken along the line II in Fig. 3. Fig. 5 is a horizontal cross-sectional view taken along the line II-II in Fig. 3. Fig. 6 is a horizontal cross-sectional view taken along the line III-III in Fig. 3.
The lifting device 22 comprises a rectangular frame 40 that surrounds the support pillar 11A and becomes part of the crane installation floor 20, a reaction member 41 engaged with the upper end of the support pillar 11A, a hanging material 42 that is wound around the reaction member 41 and has one end connected to the crane installation floor 20, and a strand jack 43 that is provided on the crane installation floor 20 and serves as a lifting jack that pulls the other end of the hanging material 42.

The frame 40 comprises a rectangular frame base 50, a gate-shaped jack support 51 rotatably mounted on the frame base 50, and a gate-shaped suspension support 52 rotatably mounted on the frame base 50 at a position opposite the jack support 51 across the support column 11A. The beam member 30 of the crane installation floor 20 connects the frame bases 50 of the lifting devices 22 together.

The frame base 50 comprises a pair of beam members 53A made of H-shaped steel extending approximately parallel to each other in the X direction, and a pair of beam members 53B made of H-shaped steel connecting the beam members 53A and extending approximately parallel to each other in the Y direction.
A jack support part 51 is rotatably supported on the upper surface of one beam member 53B. The strand jack 43 is fixed facing upward to the jack support part 51. A hanging member support part 52 is rotatably supported on the upper surface of the other beam member 53B. One end of the hanging member 42 is connected to this hanging member support part 52.

The reaction member 41 comprises a rectangular cylindrical box member 60 that is placed over the upper end of the support column 11A and has its upper end sealed, and a reaction beam 61 that is provided on the box member 60 and extends substantially horizontally.
The reaction beam 61 includes a pair of horizontal members 62 that are substantially parallel to each other, and a pair of pulleys 63 that are rotatably supported between both ends of the pair of horizontal members 62 .
The hanging material 42 is wound around a pair of pulleys 63, one end of which is connected to the hanging material support part 52 and the other end of which is connected to the strand jack 43 fixed to the jack support part 51.

In the above-described lifting device 22, as shown in FIG. 7(a), when the strand jack 43 pulls the hanging material 42, the crane installation floor 20 rises relative to the support column 11A. On the other hand, as shown in FIG. 7(b), when the strand jack 43 sends out the hanging material 42, the crane installation floor 20 descends relative to the support column 11A.

8 and 9 are schematic diagrams showing the operation of the locking device 23. In FIG.
5 and 6, the locking device 23 includes a pair of bar beams 70 and a pair of opening/closing mechanisms 71A, 71B that move substantially horizontally in a direction to move the pair of bar beams 70 closer to or farther apart. The locking device 23 locks the pair of bar beams 70 by placing them on the upper surfaces of the pair of joint parts 15 of the support column 11A.

As shown in Figures 5 and 6, the opening and closing mechanism 71A is provided on one of the beam members 53A of the frame base 50, and includes a pair of support parts 72 that support one end side of the pair of bar beams 70 from below, and a moving mechanism 73 that moves the pair of support parts 72 approximately horizontally.

The support portion 72 comprises a horizontal piece 721 that supports the bottom surface of the bar beam 70 from below, and a pair of vertical pieces 722 that extend vertically from both ends of the horizontal piece 721 and abut against both side surfaces of the bar beam 70.
The distance h1 from the upper surface of the horizontal piece 721 of the support portion 72 to the lower surface of the beam member 53A is slightly greater than the height dimension h2 of the bar beam 70. This allows the bar beam 70 to move horizontally without interfering with the beam member 53A.

The movement mechanism 73 includes a motor 74, a pulley 75 that is rotatably mounted at a position horizontally spaced apart from the motor 74, and a chain 76 that is wound around the motor 74 and the pulley 75. One support part 72 is fixed to the upper part of the chain 76, and the other support part 72 is fixed to the lower part of the chain 76. By rotating the screw 77, the pulley 75 moves closer to or further away from the motor 74, making it possible to adjust the tension of the chain 76.

As shown in Figures 5 and 6, the opening/closing mechanism 71B is provided on the other beam member 53A of the frame base 50, and includes a pair of support parts 72 that support the other ends of the pair of bar beams 70 from below, and a moving mechanism 73 that moves the pair of support parts 72 approximately horizontally. The support parts 72 and moving mechanism 73 of the opening/closing mechanism 71B have the same configuration as the support parts 72 and moving mechanism 73 of the opening/closing mechanism 71A.

The locking device 23 locks the crane installation floor 20 to the upper surface of the joint portion 15 protruding laterally from the support column 11A in the following manner (see FIG. 3).
That is, by driving the motors 74 of the opening and closing mechanisms 71A, 71B and rotating the chain 76 in the direction of the arrow in Figure 8, the pair of bar beams 70 supported by the support portions 72 are brought closer to each other, and the pair of bar beams 70 are positioned above the joint portions 15 of the support pillars 11A.
In this state, when the crane installation floor 20 is lowered by the lifting device 22, the bar beam 70 engages with the upper surface of the joint portion 15 of the support column 11A, and the beam member 53A of the crane installation floor 20 engages with the bar beam 70 (see FIG. 3). As a result, the crane installation floor 20 is supported by the support column 11A.
At this time, the bar beam 70 moves upward relative to the support part 72, but since a pair of vertical pieces 722 of the support part 72 abuts against both side surfaces of the bar beam 70, even if the bar beam 70 moves upward, the bar beam 70 can be prevented from falling off.

On the other hand, the locking device 23 releases the locked state of the joint portion 15 of the crane installation floor 20 in the following manner.
That is, the lifting device 22 slightly raises the crane installation floor 20, and the bar beam 70 is moved downward relative to the support portion 72 and placed on the horizontal piece 721 of the support portion 72. As a result, a gap is formed between the upper surface of the bar beam 70 and the lower surface of the beam member 53A.
In this state, the motors 74 of the opening/closing mechanisms 71A, 71B are driven to rotate the chains 76 in the direction of the arrow in Fig. 9, thereby separating the pair of bar beams 70 supported by the support parts 72. The pair of bar beams 70 are retracted from above the joint parts 15 of the support columns 11A. This allows the bar beams 70 to move horizontally smoothly without contacting the bar beams 70 with the beam member 53A.

FIG. 10 is an enlarged view of the portion (vibration prevention device 24) surrounded by dashed line B of the building demolition system 2 in FIG.
The anti-sway devices 24 are provided on the crane installation floor 20 and suppress horizontal swaying of the crane installation floor 20 by pressing the side surfaces of the corners of the support pillars 11A with column pressing parts 84 described below. Specifically, as shown in Fig. 5, four anti-sway devices 24 are provided for each support pillar 11A, and the column pressing parts 84 of the four anti-sway devices 24 are brought into contact with the side surfaces of the corners of the support pillars 11A to prevent horizontal movement of the crane installation floor 20 relative to the support pillars 11A.

The anti-sway device 24 comprises a base 80 supported on the crane installation floor 20, a moving part 81 arranged on the base 80, a first moving mechanism 82 that moves the moving part 81 in the Y direction relative to the base 80, a guide mechanism 83 that guides the relative movement of the moving part 81 in the Y direction relative to the base 80, a pillar holding part 84 that can abut against the side of the corner of the support pillar 11A, a second moving mechanism 85 provided on the moving part 81 and that moves the pillar holding part 84 relatively in the X direction, and a locking mechanism 86 that temporarily fixes the pillar holding part 84 to the base 80.
A substantially horizontal support plate 87 is attached to the beam members 53A, 53B of the crane installation floor 20. The base 80 has a flat plate shape and is fixed onto the support plate 87.
The moving part 81 is in the shape of a flat plate and is placed on the base part 80 .
The first moving mechanism 82 includes a pair of female threaded portions 821 protruding from the base portion 80 , and a bolt 822 extending in the Y direction and screwed into the pair of female threaded portions 821 .
The head of the bolt 822 abuts against the side of a male screw fixing portion 851 described below, and by rotating the bolt 822 and pressing against the side of the male screw fixing portion 851, the moving portion 81 is moved relative to the base portion 80 in the Y direction.

The guide mechanism 83 includes a pair of elongated holes 831 formed in the moving part 81 and extending in the Y direction, and a pair of bolts 832 screwed into the base 80 and inserted into the pair of elongated holes 831. According to the guide mechanism 83, the bolts 832 move within the elongated holes 831, thereby guiding the relative movement of the moving part 81 in the Y direction with respect to the base 80. Furthermore, the position and orientation of the moving part 81 with respect to the base 80 is temporarily fixed by tightening the bolts 832.
The column holder 84 is also provided with a cylindrical insertion portion 841 into which a male screw 852 (described later) is inserted.

The second moving mechanism 85 includes a pair of male screw fixing parts 851 provided to protrude from the moving part 81, a male screw 852 extending in the X direction and bridged between the pair of male screw fixing parts 851, and a pair of nuts 853 screwed into the male screw 852 to sandwich the insertion part 841 of the pillar holding part 84 from both ends. By rotating the pair of nuts 853, the insertion part 841 of the pillar holding part 84 is moved in the X direction relative to the moving part 81.
The locking mechanism 86 includes a pillar holding holder 861 that is provided to protrude from the base 80 and has an elongated hole 862 formed therein, a pair of bolts 863 that are provided on the pillar holding portion 84 and inserted into the elongated holes 862 of the pillar holding holder 861, and a pair of nuts 864 that are screwed onto each bolt 863 and sandwich the pillar holding holder 861 from both sides. The position and orientation of the pillar holding portion 84 with respect to the base 80 are temporarily fixed by loosening the nuts 864 of the locking mechanism 86 and moving the pillar holding portion 84 in this state in the X direction and Y direction, and then tightening the nuts 864 of the locking mechanism 86 to sandwich the pillar holding holder 861.

The operation of the above-mentioned anti-sway device 24 will be described. Specifically, the procedure for changing the state in which the column holder 84 is separated from the support column 11A shown in Fig. 10 to the state in which the column holder 84 is in contact with the side surface of the support column 11A shown in Fig. 11 will be described.
First, the bolt 832 of the guide mechanism 83 is loosened, and the nut 864 of the lock mechanism 86 is loosened. Next, the bolt 822 of the first moving mechanism 82 is rotated to move the moving part 81 relative to the base 80 in the Y direction. Next, the bolt 832 of the guide mechanism 83 is tightened to temporarily fix the position of the moving part 81 relative to the base 80. Next, the nut 853 of the second moving mechanism 85 is rotated to move the pillar holding part 84 relative to the moving part 81 in the X direction. Next, the nut 864 of the lock mechanism 86 is tightened to temporarily fix the position of the pillar holding part 84 relative to the base 80.

Hereinafter, a procedure for demolishing an existing building 1 using the building demolition system 2 will be described with reference to the flowchart of Fig. 12. Note that Figs. 13 and 19 show only a part of the building demolition system 2.
In step S1, as shown in Fig. 13, a building demolition system 2 is constructed on the rooftop of an existing building 1. That is, a crane installation floor 20, a crane 21, a lifting device 22, a locking device 23, and a swing prevention device 24 are constructed on the rooftop of the existing building 1.
Here, since there is no support column 11A on the rooftop floor, a temporary column 90 is temporarily fixed on the floor surface of the rooftop floor in place of the support column 11A, and the reaction member 41 is engaged with the top of this temporary column 90. In addition, the latch beam 70 of the engaging device 23 is placed on a temporary beam 923 (described later) of the temporary column 90, so that the crane installation floor 20 is temporarily supported by the temporary column 90.

Fig. 14 is a side view of the temporary pillar 90. Fig. 15 is a IV-IV cross-sectional view of the temporary pillar 90 in Fig. 14. Fig. 16 is a V-V cross-sectional view of the temporary pillar 90 in Fig. 14. Fig. 17 is a side view of the cross part 911 of the temporary pillar 90. Fig. 18 is a VI-VI cross-sectional view of the cross part 911 in Fig. 17.
The temporary column 90 comprises a base portion 91 temporarily fixed on the floor surface of the rooftop floor of the existing building 1, a first column portion 92 extending upward from the base portion 91, and a second column portion 93 connected to the first column portion 92 and extending upward.

The base portion 91 is located directly above the existing support column 11A, and includes a cross portion 911 made of H-shaped steel that is approximately cross-shaped in a plan view, and four column joint portions 912 extending upward from the cross portion 911.
The cross section 911 has four extensions 913. Each extension 913 is located directly above an existing beam 12 at the rooftop floor level. Horizontal members 914 are disposed on the upper surfaces of the extensions 913 and the lower surfaces of the existing beams 12 at the rooftop floor level, and these horizontal members 914 are connected to each other by bolts 915 that pass through the existing beams 12 on the rooftop floor.
The first column portion 92 and the second column portion 93 each include column members 921, 931 which are retaining members as shaped steel, and connecting members 922, 932 which are retaining members that connect the four column members 921 at an intermediate height. At an intermediate height of the first column portion 92, a temporary beam 923 protruding from a side surface of the first column portion 92 is provided.

In step S2, as shown in FIG. 19(a), a crane 21 is used to disassemble one floor of the existing building 1 from the rooftop floor, leaving only the support columns 11A. At this time, the joints 15 of the existing columns 11 that will become the support columns 11A are left.

In step S3, the temporary support of the crane installation floor 20 by the temporary pillars 90 is released. Specifically, tension is introduced into the hanging material 42 by the strand jacks 43, and the crane installation floor 20 is lifted slightly upward and cut off from the ground. In this state, the opening and closing mechanisms 71A, 71B of the locking device 23 are driven to move the pair of latch beams 70 away from above the temporary beams 923 of the temporary pillars 90, and the temporary support by the temporary pillars 90 is released.

In step S4, as shown in FIG. 19(a), the strand jack 43 is driven to lower the crane installation floor 20 along the temporary pillars 90 by one layer.
19A, the crane installation floor 20 is temporarily supported on the support column 11A again. That is, the opening and closing mechanisms 71A and 71B of the locking device 23 are driven to position the bar beam 70 above the joint portion 15 of the support column 11A. Next, the crane installation floor 20 is lowered by the strand jack 43 to lock the bar beam 70 onto the upper surface of the joint portion 15.

In step S6, as shown in FIG. 19(b), the reaction member 41 is repositioned downward. Specifically, the reaction member 41 is lifted by the crane 21 and removed from the temporary pillar 90. Next, the second pillar portion 93, which is the upper part of the temporary pillar 90, is removed. After that, the reaction member 41 is lifted by the crane 21 and placed again on the top of the first pillar portion 92 of the temporary pillar 90, and this reaction member 41 is temporarily fixed again to the top of the first pillar portion 92 of the temporary pillar 90.

In step S7, steps S2 to S6 are repeated to demolish the existing building 1 from the rooftop floor toward the lower floors. In steps S5 to S6 repeated in step S7, the bar beam 70 is engaged with the joint 15 of the support column 11A, not with the temporary beam 923 of the temporary column 90. In steps S5 to S6 repeated in step S7, the second column section 93 is not removed and the top of the first column section 92 is not re-covered with the reaction member 41, but rather the upper part of the support column 11A is cut and removed, and the top of the lower part of the support column 11A is re-covered with the reaction member 41.

According to this embodiment, the following effects are obtained.
(1) By temporarily fixing temporary columns 90 on the floor surface of the rooftop floor and having the crane installation floor 20 supported by these temporary columns 90, even in cases where there are no support columns to support the crane installation floor 20, such as on the rooftop floor of a building, the building demolition system 2 can be installed and the existing building 1 can be demolished in a short period of time.
In addition, since the first column portion 92 and the second column portion 93 of the temporary column 90 are constructed by connecting column members 921, 931 and connecting members 922, 932, which are retaining members, the temporary column 90 can be easily dismantled and repurposed, thereby reducing construction costs.

(2) When demolishing the existing building 1, temporary columns 90 are temporarily fixed on the floor surface of the rooftop floor of the existing building 1, and the crane installation floor 20 on which the crane 21 is installed is temporarily supported by this temporary column 90. While demolishing the existing building 1 with the crane 21, the crane installation floor 20 is lowered along the temporary column 90. Thus, by installing the building demolition system 2 on the floor surface of the rooftop floor of the existing building 1, the building can be demolished in a short construction period.

Second Embodiment
This embodiment differs from the first embodiment in that a building 3 as a structure is constructed by a building construction system 4 to which the floor frame lifting system according to the second embodiment is applied. The building construction system 4 differs from the building demolition system 2 in the following configuration.
FIG. 20 is a side view of the building construction system 4.
In this embodiment, the structures of a frame 40A, a reaction member 41A, and a temporary pillar 90A are different from those of the first embodiment.
That is, the frame 40A has another jack support portion 51 in place of the hanging material support portion, and this jack support portion 51 is provided with a strand jack 43.
The reaction member 41A also includes a pair of locking portions 64 that lock onto the temporary beams 923 on the side surfaces of the temporary column 90A, a connecting beam 65 that is disposed across the support column 11A and connects the pair of locking portions 64, and a beam temporary fixing mechanism 66 that is provided on each of the pair of locking portions 64 and temporarily fixes the connecting beam 65. The hanging members 42 of the strand jacks 43 are respectively connected to the pair of locking portions 64. In this manner, the pair of locking portions 64 and the pair of connecting beams 65 form a gate-shaped frame with high rigidity in a side view.

A communication hole 67 is formed in the locking portion 64, and the connecting beam 65 is inserted into this communication hole 67 so as to be horizontally movable.
The beam temporary fixing mechanism 66 includes a wedge member 68 that temporarily fixes the connecting beam 65 to the locking portion 64 , and a holding bolt 69 that restricts the movement of the wedge member 68 .
The wedge member 68 is shaped to become thinner toward the tip, and is horizontally movable. When the wedge member 68 advances, the wedge member 68 is interposed between the communication hole 67 of the locking portion 64 and the connecting beam 65, and the connecting beam 65 is temporarily fixed to the locking portion 64. On the other hand, when the wedge member 68 retreats, the temporary fixation of the connecting beam 65 to the locking portion 64 is released. The holding bolt 69 is screwed into the locking portion 64, and by rotating the holding bolt 69 to bring the tip surface of the holding bolt 69 into contact with the base end surface of the wedge member 68, the wedge member 68 is prevented from retreating.

In the above-described lifting device 22A, when the strand jack 43 pulls the hanging material 42, the crane installation floor 20 rises relative to the support column 11A. On the other hand, when the strand jack 43 delivers the hanging material 42, the crane installation floor 20 descends relative to the support column 11A.
21, the retaining bolt 69 of the reaction member 41 is retracted and the wedge member 68 is retracted, whereby the temporary fixation of the connecting beam 65 to the locking portion 64 is released, and the connecting beam 65 becomes movable horizontally. Thereafter, the connecting beam 65 is manually moved horizontally to retreat from above the support column 11A. This releases the connection between the pair of locking portions 64.
The temporary pillar 90A differs from the temporary pillar 90 in that a temporary beam 923 protruding from the side surface of the second pillar portion 93 is provided at the mid-height of the second pillar portion 93 (see FIG. 23(a)).

A procedure for constructing a building 3 by the building construction system 4 will be described below with reference to the flowchart in Fig. 22. Note that Figs. 23 and 24 show only a part of the building construction system 4.
23(a), the building construction system 4 is constructed on the floor surface of a predetermined floor (e.g., the nth floor) of the building 3. That is, a temporary column 90A is installed on the floor surface of the predetermined floor of the building 3, and the building construction system 4 is supported by this temporary column 90A. At this time, the locking portion 64 of the reaction member 41A of the lifting device 22 is locked to the temporary beam 923 protruding from the side surface of the second column portion 93 of the temporary column 90A.

In step S12, one story of the building 3 is constructed using the crane 21.
In step S13, the reaction member 41A is repositioned upward. Specifically, as shown in Fig. 23(b), the connecting beam 65 of the reaction member 41A is moved and retracted from directly above the temporary column 90A, and in this state, a column member that is a retaining member is attached to the top of the temporary column 90A, and the temporary column 90A is extended upward by one layer. Next, as shown in Fig. 24(a), the reaction member 41A is lifted by the crane 21 and repositioned upward by one layer, and then the connecting beam 65 is moved and the pair of locking parts 64 are connected to each other again.

In step S14, the temporary support of the crane installation floor 20 by the temporary columns 90A is released. That is, tension is introduced into the hanging materials 42 by the strand jacks 43 to lift the crane installation floor 20 slightly upward and to cut it off the ground. In this state, the opening and closing mechanisms 71A, 71B of the locking device 23 are driven to move the pair of bar beams 70 away from above the temporary beams 923 of the temporary columns 90A.
In step S15, as shown in FIG. 24(b), the strand jack 43 is driven to raise the crane installation floor 20 by one layer along the temporary columns 90A.

In step S16, the crane installation floor 20 is temporarily supported again by the temporary column 90. That is, the opening and closing mechanisms 71A, 71B of the locking device 23 are driven to position the pair of bar beams 70 on the temporary beams 923 of the temporary column 90A. Next, the crane installation floor 20 is lowered by the strand jack 43 to lock the bar beam 70 onto the upper surface of the temporary beam 923 of the temporary column 90A.
In step S17, steps S12 to S16 are repeated.

According to this embodiment, in addition to the above-mentioned effect (1), the following effect is obtained.
(3) When constructing the building 3, temporary columns 90A are temporarily fixed on the floor surface of the nth floor, and the crane installation floor 20 on which the crane 21 is installed is temporarily supported by these temporary columns 90A, and the crane installation floor 20 is raised along the temporary columns 90A while the building 3 is being constructed by the crane 21. Thus, the building construction system 4 is installed on the floor surface, and the building 3 can be constructed in a short construction period.

The present invention is not limited to the above-described embodiment, and any modifications or improvements that can achieve the object of the present invention are included in the present invention.

1... Existing building (structure) 2... Building demolition system (floor frame lifting system)
3... Building (structure) 4... Building construction system (floor frame lifting system)
Reference Signs List 11: Existing column 11A: Support column 12: Existing beam 13: Existing floor 15: Joint 20: Crane installation floor (floor frame) 21: Crane 22, 22A: Lifting device 23: Locking device 24: Swing prevention device 30: Beam member 31: Floor member 32: Base 33: Mast 34: Crane body 35: Jib 36: Hoisting device 40, 40A: Frame 41, 41A: Reaction member 42: Suspension material 43: Strand jack (lifting jack)
50...Frame base 51...Jack support portion 52...Suspension member support portion 53A...Beam member 53B...Beam member 60...Box member 61...Reaction beam 62...Horizontal member 63...Pulley 64...Latching portion 65...Connecting beam 66...Temporary beam fixing mechanism 67...Communicating hole 68...Wedge member 69...Pressing bolt 70...Latching beam 71A, 71B...Opening and closing mechanism 72...Support portion 73...Moving mechanism 74...Motor 75...Pulley 76...Chain 80...Base 81...Moving portion 82...First moving mechanism 83...Guide mechanism 84...Column holding portion 85...Second moving mechanism 86...Lock mechanism 87...Support plate 90, 90A...Temporary column 91...Base portion 92...First column portion 93...Second column portion 721...Horizontal piece 722...Vertical piece 821...Female threaded portion 822...Bolt 831...Slotted hole 832...Bolt 841...Insertion portion 851...Fixed portion 852...Male thread 853...Nut 861...Retaining portion 862...Slotted hole 863...Bolt 864...Nut 911...Cross portion 912...Column joint portion 913...Extension portion 914...Horizontal member 915...Bolt 921...Column member (shaped steel) 922...Connecting member 923...Temporary beam 931...Column member (shaped steel) 932...Connecting member

Claims (3)

A floor frame lifting system for lifting and lowering a floor frame along a temporary column,
A temporary pillar installed on the floor;
The floor frame;
A reaction member engaged with an upper portion of the temporary pole;
a lifting jack attached to the reaction member for lifting and lowering the floor frame installation floor,
The temporary column has a base portion temporarily fixed on the floor surface,
A floor frame lifting system comprising: a column portion extending upward from the base portion and formed by connecting a plurality of steel beams. A method for dismantling a structure using the floor frame lifting system of claim 1, comprising:
A first step of temporarily fixing at least four of the temporary columns on a floor surface, attaching reaction members to upper ends of the temporary columns, and temporarily supporting the floor frame on the temporary columns;
A second step of disassembling the structure into predetermined floors;
a third step of releasing the temporary support of the floor frame by the temporary columns, lowering the floor frame along the temporary columns by the lifting jack device, and then temporarily supporting the floor frame on the temporary columns again;
A fourth step of removing the upper part of the temporary column and lifting the reaction member and placing it downward;
a fifth step of repeating the second step to the fourth step. 13. A method for constructing a structure using the floor frame lifting system of claim 1, comprising:
A first step of temporarily fixing at least four of the temporary columns on a floor surface, attaching reaction members to upper ends of the temporary columns, and temporarily supporting the floor frame on the temporary columns;
A second step of constructing the structure for a predetermined number of floors;
A third step of extending the temporary column upward and lifting the reaction member upward;
a fourth step of releasing the temporary support of the floor frame by the temporary columns, and raising the floor frame along the temporary columns by the lifting jack device so that the floor frame is temporarily supported by the temporary columns again;
A method for constructing a structure, comprising a fifth step of repeating the second step to the fourth step.

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