Methods for demolishing structures

Abstract

To provide a floor frame lifting system which can construct and disassemble a building in a short construction period, even if a support column does not exist on a floor surface.SOLUTION: A building disassembling system 2 lifts a crane 21 along a temporary column 90. The building disassembling system 2 includes the temporary column 90 installed on a floor surface of a roof floor, a crane installation floor 20 for supporting the crane 21, a reaction force member 41 which is engaged with the upper end of the temporary column 90, and a strand jack 43 which is mounted on the reaction force member 41 and lifts the crane installation floor 20. The temporary column 90 includes a base part 91 which is temporarily fixed to the floor surface, and a first column part 92 and a second column part 93 which extend upward from the base part 91 and connect column members 921 and 931 as a plurality of earth-retaining materials.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present invention relates to a floor frame lifting system, a method for demolishing a structure using the floor frame lifting system, and a method for constructing a structure using the floor frame lifting system.

Background Art

[0002] Conventionally, existing buildings have been demolished due to aging of facilities and structures, and the following methods are available for demolishing such existing buildings. For example, Patent Documents 1 and 2 disclose a demolition system for demolishing an existing structure. The demolition system comprises a crane installation floor on which a crane is installed, support columns that are existing columns supporting the crane installation floor, and a lifting device that lowers the crane installation floor along the support columns. When demolishing an existing structure, the existing structure is sequentially demolished from the upper floor to the lower floor by repeatedly driving the lifting device to lower the crane installation floor and temporarily support it on the support columns.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0004] An object of the present invention is to provide Solution a method for demolishing a structure that enables construction of a building in a short construction period , structure even when no support pillar exists on the floor surface Law .[[-END]]

Means for Solving the Problem

[0005] The floor frame lifting system of the first invention (for example, the building demolition system 2 and building construction system 4 described later) is a floor frame lifting system that lifts a floor frame (for example, the crane installation floor 20 described later) along a temporary column (for example, the temporary columns 90 and 90A described later), comprising: a temporary column installed on the floor surface; the floor frame; a reaction force member (for example, the reaction force members 41 and 41A described later) locked to the upper end of the temporary column; and a lifting jack (for example, the strand jack 43 described later) attached to the reaction force member for lifting the floor frame, wherein the temporary column comprises a base portion (for example, the base portion 91 described later) temporarily fixed on the floor surface; and a column portion (for example, the first column portion 92 and second column portion 93 described later) extending upward from the base portion and connecting a plurality of shaped steels (for example, the column members 921 and 931 described later).

[0006] According to this invention, by temporarily fixing temporary columns to the floor surface and supporting the floor frame on these temporary columns, the floor frame system can be installed and the construction or demolition of a building can be carried out in a short period of time, even in cases where there are no support columns to support the floor frame, such as on the rooftop floor of a building. Furthermore, since the column section of the temporary column is constructed by connecting multiple structural steel sections, the temporary column can be easily dismantled and reused, thereby reducing construction costs.

[0007] The second invention is a method for dismantling a structure using the floor frame lifting system described above (for example, the building demolition system 2 described later), the method comprising: a first step (for example, step S1 described later) of temporarily fixing at least four of the temporary columns on 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 (for example, step S2 described later) of dismantling the structure into predetermined floor sections; and using the temporary columns... The method is characterized by comprising: a third step (for example, steps S3 to S5 described later) of releasing the temporary support of the floor frame, lowering the floor frame along the temporary column using the lifting jack device, and then temporarily supporting the floor frame on the temporary column again; a fourth step (for example, step S6 described later) of removing the upper part of the temporary column and lifting the reaction force member and repositioning it downwards; and a fifth step (for example, step S7 described later) of repeating the second to fourth steps.

[0008] According to this invention, when demolishing a structure, for example, temporary columns are temporarily fixed to the floor surface of the rooftop, and a floor frame on which a crane is installed is temporarily supported by these temporary columns. The floor frame is then lowered along the temporary columns while the structure is demolished with the crane. Thus, by installing a floor frame lifting system on the floor surface, the building can be demolished in a short period of time.

[0009] The third invention is a method for constructing a structure using the floor frame lifting system described above (for example, the building construction system 4 described later), comprising: a first step (for example, step S11 described later) of temporarily fixing at least four of the temporary columns on 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 (for example, step S12 described later) of constructing the structure for a predetermined number of floors; and raising the temporary columns The invention is characterized by comprising: a third step (for example, step S13 described later) of extending the reaction force member in one direction and lifting it to move it upward; a fourth step (for example, steps S14 to S16 described later) of releasing the temporary support of the floor frame by the temporary column and raising the floor frame along the temporary column using the lifting jack device to temporarily support the floor frame on the temporary column again; and a fifth step (for example, step S17 described later) of repeating the second to fourth steps.

[0010] According to this invention, when constructing a structure, temporary columns are temporarily fixed to the floor surface of a predetermined floor, and a floor frame on which a crane is installed is temporarily supported by these temporary columns. While constructing the structure with the crane, the floor frame is raised along the temporary columns. Therefore, by installing a floor frame lifting system on the floor surface, the building can be constructed in a short period of time. [Effects of the Invention]

[0011] According to the present invention, even if there are no support columns on the floor surface, the building Solution The body can be constructed in a short period of time. , structure Methods of dismantling creations Law We can provide it. [Brief explanation of the drawing]

[0012] [Figure 1] This is a side view of a building demolition system to which the floor frame lifting system according to the first embodiment of the present invention is applied. [Figure 2] This is a plan view of the building demolition system according to the first embodiment. [Figure 3]It is an enlarged view of the portion surrounded by broken line A of the building construction system in Fig. 1. [Figure 4] It is a view along the line I-I of the building construction system in Fig. 3. [Figure 5] It is a horizontal sectional view taken along line II-II of the building construction system in Fig. 3. [Figure 6] It is a horizontal sectional view taken along line III-III of the building construction system in Fig. 3. [Figure 7] It is a schematic diagram showing the operation of the lifting device constituting the building construction system according to the first embodiment. [Figure 8] It is a first schematic diagram showing the operation of the locking device constituting the building construction system according to the first embodiment. [Figure 9] It is a second schematic diagram showing the operation of the locking device constituting the building construction system according to the first embodiment. [Figure 10] It is an enlarged view of the portion surrounded by broken line B (sway prevention device) of the building construction system in Fig. 5. [Figure 11] It is a plan view showing the operation of the sway prevention device constituting the building construction system according to the first embodiment. [Figure 12] It is a flowchart of a procedure for demolishing an existing building using the building demolition system according to the first embodiment. [Figure 13] It is a first explanatory diagram of a procedure for demolishing a building with the building demolition system according to the first embodiment. [Figure 14] It is a side view of a temporary column used when demolishing a building with the building demolition system according to the first embodiment. [Figure 15] It is a sectional view taken along line IV-IV of the temporary column in Fig. 14. [Figure 16] It is a sectional view taken along line V-V of the temporary column in Fig. 14. [Figure 17] It is a side view of a cross portion of the temporary column according to the first embodiment. [Figure 18] It is a sectional view taken along line VI-VI of the cross portion of the temporary column according to the first embodiment. [Figure 19] It is a second explanatory diagram of a procedure for demolishing a building with the building demolition system according to the first embodiment. [Figure 20] This is a side view of a building construction system according to a second embodiment of the present invention. [Figure 21] This diagram shows the operation of the lifting device that constitutes the building construction system according to the second embodiment. [Figure 22] This is an explanatory diagram illustrating the procedure for constructing a building using the building construction system according to the second embodiment. [Figure 23] This is a diagram (part 1) illustrating the procedure for constructing a building using the building construction system according to the second embodiment. [Figure 24] This is a diagram (part 2) illustrating the procedure for constructing a building using the building construction system according to the second embodiment. [Modes for carrying out the invention]

[0013] The present invention is a floor frame lifting system that raises and lowers a floor frame along temporary columns 90 and 90A that are temporarily fixed to the floor surface of a rooftop or other floor. The temporary columns 90 and 90A each consist of a base portion 91 that is temporarily fixed to the floor surface of a rooftop or other floor, and column portions 92 and 93 that extend upward from the base portion 91 (see Figures 14 to 18). Embodiments of the present invention will be described below with reference to the drawings. In the following description of embodiments, identical components will be denoted by the same reference numerals, and their descriptions will be omitted or simplified. [First Embodiment] Figure 1 is a side view of a building demolition system 2 to which the floor frame lifting system according to the first embodiment of the present invention is applied. Figure 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 structure building with a rectangular shape in plan view. This existing building 1 comprises multiple existing columns 11, multiple existing steel beams 12, and an existing reinforced concrete floor 13. Here, a portion of the existing columns 11 are used as support columns 11A that support the crane installation floor 20. Hereafter, the longitudinal direction of this existing building 1 (building demolition system 2) will be referred to as the X direction, and the transverse direction, which is approximately perpendicular to the X direction, will be referred to as the Y direction.

[0014] This existing building 1 will be demolished using the following building demolition system 2. The building demolition system 2 comprises a crane mounting floor 20 as a floor frame positioned above the floor to be demolished of the existing building 1, a crane 21 installed on the crane mounting floor 20, a lifting device 22 attached to the support column 11A to raise and lower the crane mounting floor 20 along the support column 11A, a locking device 23 provided on the crane mounting floor 20 that can be locked to the upper surface of the joint portion 15 (see Figure 6) of the support column 11A, and a sway-preventing device 24 (see Figure 5) that suppresses horizontal swaying of the crane mounting floor 20, i.e., prevents swaying. In this embodiment, there are six support columns 11A, and the lifting device 22, locking device 23, and sway-preventing device 24 are provided for each of the support columns 11A.

[0015] The crane installation floor 20 comprises a beam member 30 which is a plurality of H-shaped steel beams that connect the lifting devices 22, and a plate-shaped floor member 31 (shown as a diagonal line in Figure 2) which is a covering plate that is placed on top of these beam members 30. The crane 21 comprises a base 32 provided on a crane installation floor 20 by arranging steel materials in a grid pattern, 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 as to be able to be raised and lowered, a hook (not shown) suspended from the tip of the jib 35, and a hoisting device 36 provided on the crane body 34 for raising and lowering the hook.

[0016] Figure 3 is an enlarged view of the area enclosed by the dashed line A in Figure 1's building demolition system 2. Figure 4 is a view taken along arrow II in Figure 3. Figure 5 is a horizontal cross-sectional view taken along line II-II in Figure 3. Figure 6 is a horizontal cross-sectional view taken along line III-III in Figure 3. The lifting device 22 comprises a rectangular frame 40 that surrounds the support column 11A and becomes part of the crane installation floor 20, a reaction force member 41 that is locked to the upper end of the support column 11A, a suspension member 42 that is wrapped around the reaction force 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 acts as a lifting jack to pull the other end of the suspension member 42.

[0017] 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 member support 52 rotatably mounted on the frame base 50 at a position opposite the jack support 51, with the support column 11A in between. The beam members 30 of the crane installation floor 20 connect the frame bases 50 of the lifting device 22.

[0018] The frame base 50 comprises a pair of beam members 53A made of H-shaped steel extending substantially 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 substantially parallel to each other in the Y direction. A jack support 51 is rotatably supported on the upper surface of one beam member 53B. A strand jack 43 is fixed upward to the jack support 51. A suspension member support 52 is rotatably supported on the upper surface of the other beam member 53B. One end of the suspension member 42 is connected to this suspension member support 52.

[0019] The reaction force 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 closed, and a reaction force beam 61 that is provided on top of the box member 60 and extends substantially horizontally. The reaction beam 61 comprises a pair of horizontal members 62 that are substantially parallel to each other, and a pair of pulleys 63 that are rotatably supported between the ends of the pair of horizontal members 62. The suspension member 42 is wound around a pair of pulleys 63, with one end connected to the suspension member support section 52 and the other end connected to a strand jack 43 fixed to the jack support section 51.

[0020] In the lifting device 22 described above, as shown in Figure 7(a), when the strand jack 43 pulls the lifting member 42, the crane installation floor 20 rises relative to the support column 11A. On the other hand, as shown in Figure 7(b), when the strand jack 43 releases the lifting member 42, the crane installation floor 20 lowers relative to the support column 11A.

[0021] Figures 8 and 9 are schematic diagrams illustrating the operation of the locking device 23. As shown in Figures 5 and 6, the locking device 23 comprises a pair of bolt beams 70 and a pair of opening and closing mechanisms 71A and 71B that move substantially horizontally in a direction that brings the pair of bolt beams 70 closer together or further apart. The locking device 23 locks the pair of bolt beams 70 by placing them on the upper surfaces of the pair of joint portions 15 of the support column 11A.

[0022] As shown in Figures 5 and 6, the opening and closing mechanism 71A is provided on one beam member 53A of the frame base 50 and includes a pair of support parts 72 that support one end of a pair of crossbeams 70 from below, and a moving mechanism 73 that moves this pair of support parts 72 substantially horizontally.

[0023] The support portion 72 includes a horizontal piece 721 that supports the bottom surface of the crossbeam 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 sides of the crossbeam 70. The distance h1 from the upper surface of the horizontal piece 721 of the support 72 to the lower surface of the beam member 53A is slightly higher than the height dimension h2 of the crossbeam 70. This allows the crossbeam 70 to move horizontally without interfering with the beam member 53A.

[0024] The moving mechanism 73 includes a motor 74, a pulley 75 rotatably mounted at a horizontal distance from the motor 74, and a chain 76 wound between the motor 74 and the pulley 75. One support portion 72 is fixed to the upper part of the chain 76, and the other support portion 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, thereby allowing the tension of the chain 76 to be adjusted.

[0025] 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 end of the pair of crossbeams 70 from below, and a moving mechanism 73 that moves this pair of support parts 72 substantially 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.

[0026] The locking device 23 locks the crane installation floor 20 to the upper surface of the joint portion 15 that protrudes laterally from the support column 11A in the following manner (see Figure 3). In other words, by driving the motors 74 of the opening and closing mechanisms 71A and 71B to rotate the chain 76 in the direction of the arrow in Figure 8, the pair of bolt beams 70 supported by the support portion 72 are brought closer together, and the pair of bolt beams 70 are positioned on the joint portion 15 of the support column 11A. In this state, when the lifting device 22 lowers the crane installation floor 20, the latch 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 latch beam 70 (see Figure 3). As a result, the crane installation floor 20 is supported by the support column 11A. At this time, the bolt beam 70 moves upward relative to the support portion 72, but since the pair of vertical pieces 722 of the support portion 72 are in contact with both sides of the bolt beam 70, the bolt beam 70 can be prevented from falling off even when it moves upward.

[0027] Meanwhile, the locking device 23 releases the locking state of the joint portion 15 of the crane installation floor 20 in the following manner. Specifically, the lifting device 22 slightly raises the crane installation floor 20, causing the crossbar beam 70 to move downward relative to the support section 72 and rest on the horizontal piece 721 of the support section 72. This creates a gap between the upper surface of the crossbar beam 70 and the lower surface of the beam member 53A. In this state, the motors 74 of the opening and closing mechanisms 71A and 71B are driven to rotate the chain 76 in the direction of the arrow in Figure 9, thereby separating the pair of bolt beams 70 supported by the support portion 72. The pair of bolt beams 70 are moved out of the joint portion 15 of the support column 11A. As a result, the bolt beams 70 can move smoothly horizontally without contact between the bolt beams 70 and the beam member 53A.

[0028] Figure 10 is an enlarged view of the area enclosed by the dashed line B (sway bracing device 24) of the building demolition system 2 in Figure 5. The sway-preventing devices 24 are installed on the crane mounting floor 20 and suppress horizontal swaying of the crane mounting floor 20 by pressing the side surfaces of the corners of the support columns 11A with the column-holding parts 84 described later. Specifically, as shown in Figure 5, four sway-preventing devices 24 are arranged for each support column 11A, and by bringing the column-holding parts 84 of the four sway-preventing devices 24 into contact with the side surfaces of the corners of the support columns 11A, relative horizontal movement of the crane mounting floor 20 with respect to the support columns 11A is prevented.

[0029] The sway-preventing device 24 includes a base 80 supported on the crane installation floor 20, a movable part 81 positioned on the base 80, a first moving mechanism 82 for relative movement of the movable part 81 in the Y direction relative to the base 80, a guide mechanism 83 for guiding the relative movement of the movable part 81 in the Y direction relative to the base 80, a column-holding part 84 that can abut against the side surface of the corner of the support column 11A, a second moving mechanism 85 provided on the movable part 81 for relative movement of the column-holding part 84 in the X direction, and a locking mechanism 86 for temporarily fixing the column-holding part 84 to the base 80. Approximately horizontal support plates 87 are attached to the beam members 53A and 53B of the crane installation floor 20. The base 80 is flat and fixed on the support plates 87. The movable part 81 is flat and rests on the base 80. The first moving mechanism 82 comprises 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 is in contact with the side surface of the male screw fixing part 851, which will be described later. By rotating the bolt 822 and pushing against the side surface of the male screw fixing part 851, the movable part 81 is moved relative to the base part 80 in the Y direction.

[0030] The guide mechanism 83 comprises a pair of elongated holes 831 formed in the movable part 81 extending in the Y direction, and a pair of bolts 832 screwed into the base 80 and inserted through the pair of elongated holes 831. According to the guide mechanism 83, the relative movement of the movable part 81 in the Y direction with respect to the base 80 is guided by the movement of the bolts 832 within the elongated holes 831. Furthermore, the position and orientation of the movable part 81 with respect to the base 80 are temporarily fixed by tightening the bolts 832. Furthermore, the column retaining portion 84 is provided with a cylindrical insertion portion 841 through which the male screw 852, described later, is inserted.

[0031] The second moving mechanism 85 includes a pair of male screw fixing parts 851 that protrude from the moving part 81, a male screw 852 that extends in the X direction and is installed between the pair of male screw fixing parts 851, and a pair of nuts 853 that are screwed onto the male screw 852 and sandwich the insertion part 841 of the column retaining part 84 from both ends. By rotating the pair of nuts 853, the insertion part 841 of the column retaining part 84 is moved relative to the moving part 81 in the X direction. The locking mechanism 86 includes a column-holding part 861 that protrudes from the base 80 and has an elongated hole 862 formed therein, a pair of bolts 863 provided on the column-holding part 84 and inserted through the elongated hole 862 of the column-holding part 861, and a pair of nuts 864 that are screwed onto each bolt 863 and sandwich the column-holding part 861 from both sides. By loosening the nuts 864 of the locking mechanism 86, the column-holding part 84 is moved in the X and Y directions, and then the nuts 864 of the locking mechanism 86 are tightened to sandwich the column-holding part 861, thereby temporarily fixing the position and orientation of the column-holding part 84 with respect to the base 80.

[0032] The operation of the vibration damping device 24 described above will now be explained. Specifically, the procedure for moving the column restraining portion 84 from a state where it is separated from the support column 11A, as shown in Figure 10, to a state where it is in contact with the side surface of the support column 11A, as shown in Figure 11, will be explained. First, loosen the bolt 832 of the guide mechanism 83 and the nut 864 of the locking mechanism 86. Next, rotate the bolt 822 of the first moving mechanism 82 to move the moving part 81 relative to the base 80 in the Y direction. Next, tighten the bolt 832 of the guide mechanism 83 to temporarily fix the position of the moving part 81 relative to the base 80. Next, rotate the nut 853 of the second moving mechanism 85 to move the column retaining part 84 relative to the moving part 81 in the X direction. Next, tighten the nut 864 of the locking mechanism 86 to temporarily fix the position of the column retaining part 84 relative to the base 80.

[0033] The procedure for demolishing the existing building 1 using the building demolition system 2 will be explained below, referring to the flowchart in Figure 12. Note that Figures 13 and 19 show only a portion of the building demolition system 2. In step S1, as shown in Figure 13, the building demolition system 2 is constructed on the rooftop floor of the existing building 1. Specifically, 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 floor of the existing building 1. Here, since there are no support columns 11A on the rooftop floor, temporary columns 90 are temporarily fixed to the floor surface of the rooftop floor in place of the support columns 11A, and the reaction force member 41 is locked to the top of these temporary columns 90. In addition, the bolt beam 70 of the locking device 23 is placed on the temporary beam 923 of the temporary column 90, thereby temporarily supporting the crane installation floor 20 on the temporary column 90.

[0034] Figure 14 is a side view of the temporary column 90. Figure 15 is a cross-sectional view of the temporary column 90 in Figure 14 along line IV-IV. Figure 16 is a cross-sectional view of the temporary column 90 in Figure 14 along line VV. Figure 17 is a side view of the cross section 911 of the temporary column 90. Figure 18 is a cross-sectional view of the cross section 911 in Figure 17 along line VI-VI. The temporary column 90 comprises a base portion 91 temporarily fixed to 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.

[0035] The base section 91 is located directly above the existing support column 11A and comprises a cross section 911 made of H-shaped steel that is roughly cross-shaped in plan view, and four column joint sections 912 extending upward from the cross section 911. The cross section 911 comprises four extension sections 913. Each extension section 913 is located directly above the existing beam 12 at the rooftop floor level. Horizontal members 914 are positioned on the upper surface of the extension section 913 and on the lower surface of the existing beam 12 at the rooftop floor level, and these horizontal members 914 are connected to each other by bolts 915 that penetrate the existing beam 12 on the rooftop floor. The first column section 92 and the second column section 93 each comprise column members 921 and 931, which are structural steel retaining members, and connecting members 922 and 932, which are retaining members that connect the four column members 921 at an intermediate height. A temporary beam 923 is provided at an intermediate height of the first column section 92, protruding from the side of the first column section 92.

[0036] In step S2, as shown in Figure 19(a), the existing building 1 is disassembled one floor at a time from the rooftop floor, leaving the support columns 11A intact, using the crane 21. At this time, the joint portion 15 of the existing column 11 that will become the support column 11A is left intact.

[0037] In step S3, the temporary support of the crane installation platform 20 by the temporary columns 90 is released. Specifically, tension is introduced to the suspension members 42 by the strand jacks 43, lifting the crane installation platform 20 slightly above ground level. In this state, the opening and closing mechanisms 71A and 71B of the locking device 23 are driven to move the pair of crossbeams 70 away from the temporary beams 923 of the temporary columns 90, thereby releasing the temporary support provided by the temporary columns 90.

[0038] In step S4, as shown in Figure 19(a), the strand jack 43 is driven to lower the crane installation floor 20 by one layer along the temporary column 90. In step S5, as shown in Figure 19(a), the crane installation floor 20 is temporarily supported again on the support column 11A. That is, the opening and closing mechanisms 71A and 71B of the locking device 23 are driven to position the bolt beam 70 on the joint portion 15 of the support column 11A. Next, the crane installation floor 20 is lowered using the strand jack 43 to lock the bolt beam 70 to the upper surface of the joint portion 15.

[0039] In step S6, as shown in Figure 19(b), the reaction member 41 is moved downwards. Specifically, the reaction member 41 is lifted by the crane 21 and removed from the temporary column 90. Next, the second column section 93, which is the upper part of the temporary column 90, is removed. After that, the reaction member 41 is lifted by the crane 21 and placed back on the top of the first column section 92 of the temporary column 90, and the reaction member 41 is temporarily fixed again to the top of the first column section 92 of the temporary column 90.

[0040] Step S7 involves repeating steps S2 through S6 to demolish the existing building 1 from the rooftop floor downwards. In step S7, during the repeating steps S5 and S6, the crossbeam 70 is secured to the joint 15 of the support column 11A, rather than to the temporary beam 923 of the temporary column 90. Also, in step S7, during the repeating steps S5 and S6, instead of removing the second column section 93 and re-placing the reaction member 41 on the top of the first column section 92, the upper part of the support column 11A is cut off and removed, and the reaction member 41 is re-placing on the top of the lower part of the support column 11A.

[0041] This embodiment provides the following effects. (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, the building demolition system 2 can be installed and the demolition of the existing building 1 can be carried out in a short period of time, 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. Furthermore, since the first column section 92 and the second column section 93 of the temporary column 90 are constructed by connecting the column members 921, 931 and connecting members 922, 932, which are retaining materials, the temporary column 90 can be easily dismantled and reused, thereby reducing construction costs.

[0042] (2) When demolishing the existing building 1, temporary columns 90 are temporarily fixed to the floor surface of the rooftop of the existing building 1, and the crane mounting platform 20 on which the crane 21 is installed is temporarily supported by these temporary columns 90. The existing building 1 is demolished with the crane 21 while the crane mounting platform 20 is lowered along the temporary columns 90. Thus, the building demolition system 2 is installed on the floor surface of the rooftop of the existing building 1, and the building can be demolished in a short period of time.

[0043] [Second Embodiment] In this embodiment, the building 3 as a structure is constructed using 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. Figure 20 is a side view of the building construction system 4. In this embodiment, the structure of the frame 40A, the reaction member 41A, and the temporary column 90A differs from that of the first embodiment. In other words, frame 40A is equipped with another jack support section 51 instead of a suspension member support section, and a strand jack 43 is provided on this jack support section 51. Furthermore, the reaction member 41A includes a pair of locking parts 64 that engage with the temporary beam 923 on the side of the temporary column 90A, a connecting beam 65 that straddles the support column 11A and connects the pair of locking parts 64, and a beam temporary fixing mechanism 66 provided on each of the pair of locking parts 64 to temporarily fix the connecting beam 65. The suspension members 42 of the strand jack 43 are connected to each of the pair of locking parts 64. In this way, the pair of locking parts 64 and the pair of connecting beams 65 form a gate-shaped, highly rigid frame in a side view.

[0044] A communication hole 67 is formed in the locking portion 64, and the connecting beam 65 is inserted through this communication hole 67, allowing it to move horizontally. The beam temporary fixing mechanism 66 includes a wedge member 68 for temporarily fixing the connecting beam 65 to the locking portion 64, and a retaining bolt 69 for restricting the movement of the wedge member 68. The wedge member 68 has a shape that tapers towards the tip and is movable horizontally. When the wedge member 68 moves forward, it 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 moves backward, the temporary fixation of the connecting beam 65 to the locking portion 64 is released. The retaining bolt 69 is screwed into the locking portion 64, and by rotating the retaining bolt 69, the tip surface of the retaining bolt 69 is brought into contact with the base end surface of the wedge member 68, thereby preventing the wedge member 68 from moving backward.

[0045] In the lifting device 22A described above, when the strand jack 43 pulls the lifting member 42, the crane mounting floor 20 rises relative to the support column 11A. Conversely, when the strand jack 43 releases the lifting member 42, the crane mounting floor 20 lowers relative to the support column 11A. Furthermore, as shown in Figure 21, by retracting the retaining bolt 69 of the reaction member 41 and the wedge member 68, the temporary fixing of the connecting beam 65 to the locking portion 64 is released, allowing the connecting beam 65 to move horizontally. Subsequently, the connecting beam 65 is manually moved horizontally to move it away from above the support column 11A. This releases the connection between the pair of locking portions 64. The temporary column 90A differs from the temporary column 90 in that a temporary beam 923 is provided at an intermediate height of the second column section 93, protruding from the side of the second column section 93 (see Figure 23(a)).

[0046] The procedure for constructing Building 3 using Building Construction System 4 will be explained below, referring to the flowchart in Figure 22. Note that Figures 23 and 24 show only a portion of Building Construction System 4. In step S11, as shown in Figure 23(a), the building construction system 4 is constructed on the floor surface of a predetermined floor (for example, the nth floor) of the building 3. That is, a temporary column 90A is installed on the floor surface of a 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 that protrudes from the side of the second column portion 93 of the temporary column 90A.

[0047] In step S12, the crane 21 is used to construct one floor of building 3. In step S13, the reaction member 41A is moved upward. Specifically, as shown in Figure 23(b), the connecting beam 65 of the reaction member 41A is moved to a position above the temporary column 90A. In this state, a column member, which is a retaining member, is attached to the temporary column 90A to extend the temporary column 90A upward by one layer. Next, as shown in Figure 24(a), the reaction member 41A is lifted by the crane 21 and moved upward by one layer. After that, the connecting beam 65 is moved and the pair of locking parts 64 are reconnected.

[0048] In step S14, the temporary support of the crane installation platform 20 by the temporary column 90A is released. That is, tension is introduced to the suspension member 42 by the strand jack 43, lifting the crane installation platform 20 slightly upward and lifting it off the ground. In this state, the opening and closing mechanisms 71A and 71B of the locking device 23 are driven to move the pair of crossbeams 70 away from the temporary beams 923 of the temporary column 90A. In step S15, as shown in Figure 24(b), the strand jack 43 is driven to raise the crane installation floor 20 by one level along the temporary column 90A.

[0049] In step S16, the crane installation platform 20 is temporarily supported again on the temporary column 90. That is, the opening and closing mechanisms 71A and 71B of the locking device 23 are driven to position the pair of crossbeams 70 on the temporary beam 923 of the temporary column 90A. Next, the crane installation platform 20 is lowered using the strand jack 43 to lock the crossbeams 70 to the upper surface of the temporary beam 923 of the temporary column 90A. In step S17, steps S12 through S16 are repeated.

[0050] According to this embodiment, in addition to the effect of (1) described above, the following effects are obtained. (3) When constructing building 3, temporary columns 90A are temporarily fixed to 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. While constructing building 3 with the crane 21, the crane installation floor 20 is raised along the temporary columns 90A. Thus, the building construction system 4 is installed on the floor surface, and building 3 can be constructed in a short period of time.

[0051] Furthermore, the present invention is not limited to the embodiments described above, and any modifications, improvements, etc., that can achieve the objectives of the present invention are included within the scope of the present invention. [Explanation of Symbols]

[0052] 1…Existing building (structure) 2…Building demolition system (floor frame lifting system) 3…Building (structure) 4…Building construction system (floor frame lifting system) 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... Anti-sway 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 member 43... Strand jack (lifting jack) 50...Frame base 51...Jack support section 52...Suspension member support section 53A...Beam member 53B...Beam member 60...Box member 61...Reaction beam 62...Horizontal member 63...Pulley 64...Locking part 65...Connection beam 66...Beam temporary fixing mechanism 67...Communication hole 68...Wedge member 69...Retaining bolt 70...Blocking beam 71A, 71B...Opening / closing mechanism 72...Support part 73...Moving mechanism 74...Motor 75...Pulley 76...Chain 80...Base 81...Moving part 82...First moving mechanism 83...Guide mechanism 84...Column holding section 85...Second movement mechanism 86...Locking mechanism 87...Support plate 90, 90A... Temporary column 91... Base section 92... First column section 93... Second column section 721... Horizontal piece 722... Vertical piece 821...Female threaded section 822...Bolt 831...Slotted hole 832...Bolt 841... Insertion part 851... Fixing part 852... Male thread 853... Nut 861...Retaining part 862...Slotted hole 863...Bolt 864...Nut 911...Cross section 912...Column joint section 913...Extension section 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

[Claim 1] A method for dismantling a structure using a floor frame lifting system, The floor frame lifting system comprises a temporary column installed on the floor surface, the floor frame, a reaction member locked to the upper part of the temporary column, and a lifting jack attached to the reaction member for raising and lowering the floor frame, wherein the temporary column comprises a base portion temporarily fixed on the floor surface, and a column portion extending upward from the base portion and formed by connecting a plurality of shaped steel sections. The first step involves temporarily fixing at least four of the temporary columns to the floor surface of the rooftop level, attaching reaction members to the upper ends of the temporary columns, and temporarily supporting the floor frame on the temporary columns. A second step involves disassembling the aforementioned structure into predetermined floor sections, A third step involves releasing the temporary support of the floor frame by the temporary column, lowering the floor frame along the temporary column using the lifting jack, and then temporarily supporting the floor frame on the existing support column of the structure located below the temporary column. The fourth step involves removing the upper part of the temporary column and lifting the reaction member and repositioning it to the lower part of the temporary column. A fifth step involves disassembling the aforementioned structure into predetermined floor sections, A sixth step involves releasing the temporary support of the floor frame by the support columns, lowering the floor frame along the support columns using the lifting jacks, and then temporarily supporting the floor frame again on the support columns. A seventh step involves removing the support column to a predetermined height and lifting the reaction member and repositioning it downwards. A method for dismantling a structure, characterized by comprising an eighth step which involves repeating the fifth to seventh steps described above.

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