JP5985263B2 - Structure demolition method - Google Patents

Description

  The present invention relates to a structure demolition method.

  In Patent Document 1, in bridge floor slab dismantling work, the lifting force is applied to the lower surface of the existing floor slab while supporting the reaction force with the girder material (main construction), and the fixing between the main girder upper flange and the floor slab is released. Then, after separating the two, a floor slab dismantling method is disclosed in which an existing floor slab is removed.

  Patent Document 2 discloses a method for disassembling a floor slab in which the floor slab is cut obliquely so that the width of the upper surface of the block is larger than the width of the lower surface in the method of cutting the floor slab into blocks.

  Patent Document 3 discloses a dismantling method for cutting H steel while leaving a lower flange. Other related building demolition methods are disclosed in Patent Documents 4-6.

  However, there is a demand for more efficient dismantling of structures.

Patent 4073454 JP 61-60910 A JP 2012-1905 A JP 2012-1902 A JP 2012-1903 A JP 2012-1904 A

  In view of the above facts, an object of the present invention is to provide a structure demolition method capable of efficiently deconstructing a structure.

The structure dismantling method according to claim 1 includes a first step of placing a support beam on a steel material constituting the beam, and extending the support beam between the steel materials, and a support member between the support beam and the slab. A second step of providing and supporting the slab; and a third step of disassembling the slab.

In the structure dismantling method according to claim 1 , the support beam is placed on the steel material constituting the beam, the support beam is extended between the steel materials, and the support member is provided between the support beam and the slab to support the slab. To do. In this state, the slab is dismantled.

  Here, for example, in the case of a construction method in which a slab is supported by a support work and the slab is dismantled, the support work becomes an obstacle on the lower floor of the dismantling slab.

On the other hand, the slab to be disassembled by supporting the slab to be disassembled by the support beam and the support member that is placed between the steel materials by placing the support beam on the steel material that constitutes the beam as in this method of construction. Since the support beams do not get in the way on the lower floor, for example, the dismantling work can be performed on the lower floor in advance. Therefore, the efficiency of the structure dismantling work is improved.

  In the structure dismantling method according to claim 2, the support beam is a member that can expand and contract in the longitudinal direction.

  In the structure dismantling method according to the second aspect, the support beam can be extended and extended in accordance with the interval between the steel materials. Therefore, the support beam can be easily routed as compared with the case where the support beam does not expand and contract in the longitudinal direction. Therefore, the efficiency of the structure dismantling work is improved.

  According to the present invention, the structure can be efficiently dismantled.

It is a side view which shows the demolition building demolished using the demolition construction method which concerns on one Embodiment of this invention. It is process drawing which shows the descent | fall process (A)-(D) of the work equipment in the dismantling method which concerns on one Embodiment of this invention. It is process drawing which shows the descent | fall procedure (A)-(D) of the raising / lowering apparatus in the dismantling method which concerns on one Embodiment of this invention. It is explanatory drawing which showed a mode that the demolition building was demolished from the top to the bottom by the demolition construction method which concerns on one Embodiment of this invention from (A) to (C) in order. It is a side view which shows the slab disassembly process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the beam dismantling process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the outer periphery pillar dismantling process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the bearing wall dismantling process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the inner peripheral pillar dismantling process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the hat | hutdown (trademark) process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the fixing process in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the unloading process of the fixing device in the dismantling method which concerns on one Embodiment of this invention. It is a side view which shows the state which spanned the beam material on the H-section steel and supported the slab. (A) is a side view showing a state in which the beam material shown in FIG. 13 is extended in the longitudinal direction, and (B) is a side view showing a state in which the beam material is contracted in the longitudinal direction. It is a top view at the time of seeing the slab supported using the beam material from the upper part. It is a top view which shows the cutting line which cut | disconnects the slab supported using the beam material. It is a perspective view which shows the state which lifted the thrust block body with the crane. (A) is a perspective view which shows the cutting line which cut | disconnects the slab of the site | part corresponding to a beam, (A) is a perspective view which shows the state which removed the removal part. It is process drawing which shows process (A)-(C) which disassembles to a beam slab block body. It is process drawing which shows process (D)-(E) which disassembles to a beam slab block body. (A) It is a side view which shows the H-section steel before a cutting | disconnection, (B) It is a side view which shows the state by which the cut surface of the H-section steel was cut | disconnected by the T shape. (A) It is a side view which shows the H-section steel before a cutting | disconnection, (B) It is a side view which shows the state by which the cut surface of the H-section steel was cut | disconnected by Z shape. It is a side view which shows the state which cut | disconnected the steel pipe of the outer periphery of the column of the column beam block body in which the position away from the axial center of the column is a gravity center position in planar view. FIG. 23 shows a state where the crane is operated to loosen the suspended state of the wire, the column is tilted, bending stress is generated in the column, and the concrete inside the column is broken with respect to the column beam block body of FIG. It is a side view. It is a side view which shows the state which lifted the column beam block body with the crane after the fracture | rupture of FIG. (A) is a top view which shows the slab containing a jumping part, (B) is a side view which shows the state which lifted the beam slab block body containing a jumping part with the crane.

  A dismantling method to which the present invention is applied will be described with reference to the drawings. In addition, as FIG.1, FIG.4 etc. show, the demolished building 10 to which the present invention is applied and demolished is a high-rise hotel. Moreover, as shown in FIG. 1 etc., the demolished building 10 is a CFT column 28 (see FIG. 14, FIG. 15, FIG. 17 etc.) in which a high strength concrete 28B is densely filled in a cylindrical steel pipe 28A. ), A steel frame 30, a reinforced concrete slab 32, a reinforced concrete bearing wall 63 (see FIG. 7 and the like) including a steel brace 206, and the like, and an outer wall panel 34 is installed on the outer wall surface. Yes. That is, the column 28 constitutes a frame column, the beam 30 constitutes a frame beam, and the slab 32 constitutes a frame floor.

  The standard floor of the dismantling floor is the Nth floor, the floor one floor below the standard floor is the N-1 floor, the floor two floors below the standard floor N is the N-2 floor, and the floor three floors below the standard floor N The N-3 floor and the floor above the reference floor N are defined as the N + 1 floor.

<Working equipment>
First, the overall configuration of the work facility 900 according to the embodiment of the present invention will be described. The work facility 900 includes a dismantling space construction system, a lifting system, an energy management system, and the like.

  As shown in FIG. 1, a demolition work space 904 (see also FIGS. 2 and 4) is formed by surrounding the upper portion of the demolition building 10 by a curing unit 902 constituting the work facility 900. By performing the demolition work in the demolition work space 904, vibration, noise, dust, and the like that occur during the demolition work and reach the periphery of the demolition building 10 are suppressed.

  Also, the dismantled dismantling block 906 is lowered by the crane 112 (crane 112D described later in FIG. 1) using the transport space 908 (see also FIG. 4) provided in the dismantling building 10 along the vertical direction. To go. And as shown to (A)-(D) of FIG. 4 in order, the work equipment 900 (curing | curing | curing part 902) is lowered | hung and the demolished building 10 is demolished one by one from the top to the bottom.

  In this way, the work facility (mobile dismantling factory (hat)) 900 is installed at the upper part of the demolition building 10, and the demolition building 10 is sequentially dismantled while moving the work facility 900 from the upper floor to the lower floor. The construction method is referred to as a “HAT DOWN (registered trademark) construction method”. As described above, the dismantling equipment including the crane 112 is integrated in the work equipment 900, and the work equipment 900 descends without gaps while wrapping the building housing of the dismantling building 10, and the dismantling material is lowered through the inside of the dismantling building 10, so that the conventional construction method is used. Compared to, disassembly is safer and more environmentally friendly.

  In the present embodiment, an example in which the present invention is applied to the “HAT DOWN (registered trademark) method” will be described, but the present invention is not limited to this. The present invention can be widely applied to the dismantling of structures.

(Dismantling space construction system)
Next, the dismantling space construction system will be described.

  As shown in FIG. 1, the dismantling space construction system has a curing unit 902 configured to include a movable enclosure 12, a wall structure 14, a gap curing device 170, and the like. The movable enclosure 12 includes an outer structure 16 as a frame and an elevating device 18 as an elevating unit that raises and lowers the outer structure 16.

  The exterior 16 constituting the mobile enclosure 12 constituting the curing unit 902 is a plurality of dismantling floors (in this embodiment, N + 1 floor, N floor, N-1 floor, and N-2 floor) of the dismantling building 10. It is arranged so as to surround the entire outer periphery. In addition, the wall structure 14 constituting the curing unit 902 includes a frame scaffold 60 and a soundproof wall 62.

  The struts 20 (see FIG. 3) are made of H-section steel and are arranged side by side in the direction of the beam and are arranged so as to constitute a truss and a pair of outer frames 36 that are arranged substantially vertically and connect the pair of outer frames 36 to each other. And a member (not shown). A receiving beam 64 is provided at the lower end of the outer frame 36 so as to project outside the outer structure 16 (on the side away from the demolished building 10). A scaffold plate (not fixed) installed on the receiving beam 64 is provided. A frame scaffold 60 is built on top of the structure so as to form a plurality of layers.

  The external structure 16 includes a plurality of support columns 20, a connecting beam (not shown) that connects the adjacent support columns 20, and a brace member (attached illustration) that connects the adjacent support columns 20 and restrains the support column 20. ). Further, the end of the brace member is joined to a gusset plate (not shown) by tightening the bolt. Then, by tightening, loosening, or loosening the bolt, it is possible to adjust the joining force of the joint between the support column 20 (the gusset plate) and the end of the brace member. That is, the restraining force that restrains the support column 20 by the brace member can be changed.

  The soundproof wall 62 is composed of a plurality of soundproof panels 66 that are attached to the side surface of the frame scaffold 60 and are arranged with substantially no gap. A solar panel 128 is fixed to a part of the outer wall surface of the soundproof panel 66 (see also FIG. 4).

  An openable roof 118 is installed so as to cover the upper surface of the dismantling work space 904. The openable roof 118 is configured to be opened and closed by a curtain-shaped opening and closing member. And by opening the open / close roof 118, the dismantling work space 904 is effectively ventilated, and the work environment of the dismantling work space 904 can be kept good, and as a result, the efficiency of the dismantling work is improved.

(Lifting system)
Next, the lifting system will be described.

  As shown in FIG. 1, the lifting system includes a plurality of cranes 112 </ b> A to 112 </ b> E and beams 114 and 116 disposed in the dismantling work space 904. The beam 116 is made of H-shaped steel, and moves in parallel in the column direction by running on a rail laid on the receiving beam 40 that is laid on and opposed to the column 20.

  The crane 112 </ b> A is movable in the direction between the beams of the demolished building 10 along a rail 120 made of H-section steel attached to the lower surface of the beam 116. The crane 112 </ b> B is installed in the vicinity of the left and right ends of the beam 114, and the crane 112 </ b> C is installed in the approximate center of the beam 114. The crane 112D is installed on the right end of the beam 114, and is configured to move up and down by a winch 124 that winds up a wire 111 suspended downward through a direction change sheave 122 attached to the beam 114. The crane 112E is installed on the uppermost frame scaffold 60.

  These cranes 112A to 112E are classified into three types: a fixed type, a one-way movement type, and a two-way movement type. The fixed type is a crane that does not move in the horizontal direction, the one-way movement type is a crane that can move only in the beam direction, and the two-way movement type is a crane that can move in two directions, the beam direction and the beam direction. It is. The crane 112E corresponds to the one-way type crane, the cranes 112B, 112C, and 112D correspond to the fixed type crane, and the crane 112A corresponds to the two-way movement type crane.

  And the dismantled dismantling block 906 is lowered | hung by each crane 112 using the conveyance space 908 (refer also FIG. 4) provided in the dismantling building 10 along the up-down direction.

  As described above, the lifting system improves the work efficiency of the dismantling work by operating the plurality of cranes 112 in the dismantling work space 904.

(Energy management system)
Next, the energy management system will be described.

  Electric energy generated by the regenerative system provided in the cranes 112A to 112E and the vibration power generator G provided in the vibrating portion such as the column 28 and the slab 302 of the demolished building 10 is charged in a storage battery (not shown). Further, the electric energy generated by the solar panel 128 fixed to the side wall of the curing unit 902 (outer wall surface of the soundproof panel 66) and the roof is also charged in a storage battery (not shown).

  And the electric power charged by the storage battery is utilized by dismantling work. Thus, the energy management system reduces the electric power supplied from the outside by converting the kinetic energy and sunlight which generate | occur | produce with a dismantling work into electrical energy, and using it as electric power.

<Descent procedure of work equipment>
Next, the descending procedure of the work equipment 900 will be described. In addition, as shown in FIG. 4 etc. mentioned above, the construction method which lowers | hangs the work equipment (hat) 900 and dismantles the demolished building 10 sequentially from top to bottom is called "HAT DOWN (registered trademark)". The process of lowering the work equipment 900 is referred to as a “HAT DOWN (registered trademark) process”.

  3 (A) to 3 (H), the case where the arm members 86 and 88 are joined to the fixing device 90 fixed to the column 28 on the outer periphery of the demolished building 10 at that position is “◯”. A case where the arm members 86 and 88 are not fixed to the fixing device 90 at the position is indicated by a symbol “x”. Further, in FIG. 3, the symbols of the arm members 86 and 88 are shown only in (A) in order to avoid the figure from becoming complicated.

  First, as shown in FIGS. 2 (A) and 3 (A), the fixing device 90 is attached to the outer pillars 28 of the N floor, N-1 floor, and N-2 floor of the demolished building 10, and the arm member 86 is attached. 88, the curing unit 902 (FIG. 2A) of the work equipment 900 is fixed.

  Next, temporary beam members 100 (see also FIG. 13 and FIG. 14) to support the slab 32 are installed on the Nth floor to the N-3th floor, which are reference floors, and various dismantling operations are performed in the dismantling work space 904. I do. Details of the dismantling work will be described later. Further, the dismantled dismantling block is lowered to the ground floor by the cranes 112 </ b> A to 112 </ b> E and carried out of the dismantling building 10. FIG. 2A shows a state in which a beam block body 31 described later is suspended by a crane 112.

  As shown in FIGS. 2B and 3B, the N-level arm members 86 and 88 are not fixed to the fixing device 90 of the demolished building 10. FIG. 2B shows a state in which a later-described column beam block body 50 is suspended by a crane 112. Moreover, the fixing device 90 is installed on the N-3 floor.

  As shown in FIG. 3C, after the arm member 86 is not fixed to the fixing device 90 on each floor, the bolts are loosened or loosened and removed, and the end of the brace member not shown is gusseted. By reducing the joining force that joins the plate, the restraining force that restrains the column 20 by the brace member is weakened.

  As shown in FIGS. 2 (C) and 3 (D), the electric motor 72 (see FIG. 3) is operated, and the column 20 surrounding the demolished building 10 is simultaneously lowered with respect to the inner column 68, so that 16 (see FIG. 2) is lowered by one floor.

  2D and 3E, after the descent of the first floor of the external structure 16 is completed, the bolts are tightened and the arm member 86 is fixed to the column 28 on the outer periphery of the demolished building 10. The support 20 is fixed to the demolished building 10 by joining to the fixing devices 90 on the N-1 floor, the N-2 floor, and the N-3 floor.

  Next, as shown in FIG. 3 (F), after the arm member 88 is not fixed to the fixing device 90 on each floor, the electric motor 72 is operated as shown in FIG. On the other hand, the inner support 68 is lowered by one floor.

  Then, as shown in FIG. 3 (H), the arm member 88 is joined to the N-1 floor, N-2 floor, and N-3 floor fixing devices 90 fixed to the pillars 28 on the outer periphery of the demolished building 10. The inner strut 68 is fixed to the demolished building 10.

  By repeating the same cycle as such steps (FIGS. 2A to 2D and 3A to 3H), the demolished building 10 is moved from the top to the bottom while the work equipment 900 is lowered. And dismantled sequentially.

<Details of dismantling method>
Next, details of each step of the dismantling method will be described. As described above, the reference floor of the dismantling floor is the Nth floor, the floor immediately below the reference floor is the N-1th floor, the second floor below the Nth floor which is the reference floor is the N-2th floor, the reference floor The 3rd floor below the Nth floor is the N-3th floor, and the floor above the Nth floor which is the reference floor is the N + 1th floor.

  First, a temporary beam material (supporting beam) 100 (described later) that supports the slab 32 on the Nth floor, which is the reference floor, and the lower floors near the Nth floor (for example, N-1 to N-3). 14 is also installed, and then the dismantling work is performed in the dismantling work space 904.

(Slab dismantling process)
As shown in FIGS. 5, 13, and 15, a beam material (peco beam) 100 as an example of a support beam is hung on the H-shaped steel 30 </ b> A of the beam 30 that supports the slab 32 to be disassembled. As shown in FIG. 15, the beam members 100 are stretched in parallel and connected by a steel pipe 110. As shown in FIG. 13, when the size of the H-shaped steel 30 </ b> A to be passed is different, the height is adjusted by sandwiching an adjustment member 115 such as a steel pipe. A jack 108 as an example of a support member is provided between the beam member 100 and the slab 32 to support the slab 32.

  Here, as shown in FIG. 14, the beam material (peco beam) 100 of this embodiment has an insertion / removal structure in which the inner beam 102 and the outer beam 104 can be inserted and removed in the longitudinal direction, and can be expanded and contracted in the longitudinal direction. It has become. Further, the inner beam 102 and the outer beam 104 having different lengths can be combined.

  As shown in FIG. 5, a lashing belt 202 is wound around the N + 1 floor pillar 28, and the lashing belt 202 is stretched between the pillars 28. Then, the slab 32 constituting the N + 1 floor (the slab 32 constituting the N floor ceiling) is cut by the load cutter 200. At this time, as shown in FIG. 16, the slab 32 is cut into a rectangular shape (notched) as indicated by a cutting line S1. Further, two cuts are made in parallel at both ends of the beam 30 as shown by the cutting line S2. And as shown in FIG. 17, the slab block body 33 which cut the slab 32 into the rectangular shape is hung with the crane 112, and is lowered | hung from the conveyance space 908 (refer FIG.1 and FIG.4) to the ground floor.

  In addition, simultaneously with the dismantling operation of the slab 32, the hoist operator is performing the slinging operation on the Nth floor below the slab 32 to be dismantled. Further, on the N-1 floor below, the outer wall panel 34 is being removed. Moreover, the installation work of the fixing device 90 is performed on the N-2 floor below. In addition, on the N-3 floor below, a marking work for cutting the slab 32 with the load cutter 200 is performed, and a drilling hole 33A for hanging the slab block body 33 with the crane 112 (FIGS. 16 and 17). Drilling work is performed.

(Beam dismantling process)
As shown in FIGS. 18, 19-1 (A), and 19-1 (B), the removal portion 29 between the cutting lines S 2 of the slab 32 of the beam 30 is removed by applying an impact with a hammer or the like. The H-section steel 30A is exposed. In addition, the space | interval (width | variety of the rectangular-shaped site | part to expose) of the two cutting lines S2 is about 50 mm in this embodiment. Further, a part from which the removing unit 29 is removed is referred to as an exposed part 27. Then, as shown in FIG. 19-1 (C), a cutting device (not shown) such as a gas melting step breaker is inserted from the exposed portion 27 and cut while leaving a part of the H-section steel 30A (cutting). Details will be described later). In addition, you may perform the operation | work so far before lifting the slab block body 33 in the case of the slab disassembly process mentioned above. In FIG. 17, the removal portion 29 is removed before the slab block body 33 is lifted.

  As shown in FIG. 6, the concrete at the junction between the N-th floor bearing wall 63 and the beam 30 and the column 28 is suspended, and a gusset plate (not shown) that joins the bearing wall 63 and the upper beam 30 is cut. .

  As shown in FIGS. 6 and 19-2 (C), the wire 111 of the crane 112 (see FIG. 1) is hung on the beam 30. As shown to FIG. 19-2 (D), the site | part left without cut | disconnecting in H-section steel 30A is cut | disconnected. Then, the beam block body 31 is lifted by the crane 112 (see FIG. 1) and lowered from the transport space 908 (see FIGS. 1 and 4) to the ground floor (see also FIGS. 2A and 6).

  As shown in FIG. 6, simultaneously with the disassembly work of the beam 30, the beam material 100, the steel pipe 110, etc. (see FIG. 13 and FIG. 14) are disassembled and carried out on the N floor. In addition, on the N-2 floor below the second floor, the fixing device 90 is continuously installed. In addition, on the N-3 floor below, the marking work for cutting with the load cutter 200 is continuously performed, and the drilling work is performed in advance.

  In addition, although the part which leaves a part of H-section steel 30A may be left in any way, in this dismantling work, it is either of the following two.

  As shown in FIG. 20, it cut | disconnects so that the cut surface of H-section steel 30A may become a T-shape. That is, it cut | disconnects so that lower flange part 30D and lower part 30CT of web 30C may be left. Or as shown in FIG. 21, it cut | disconnects so that a cut surface may become Z shape. That is, it cut | disconnects so that any one end part 30BT and the other end part 30DT of the other side of the left-right direction of lower flange part 30D may be left in the left-right direction of the upper flange part 30B. In addition, in FIG. 19-1 (C), it cut | disconnects like FIG.

(Outer peripheral column dismantling process)
As shown in FIG. 7, a net 204 is set up on the Nth floor. And it disassembles | disassembles into the column beam block body 50 comprised by the outer periphery pillar 28, the beam 30, etc. FIG. Note that FIG. 7 and FIG. 8 to be described next show internal structures such as the pillar 208 and the steel brace 206 provided in the load bearing wall 63.

  Here, in the beam disassembly process described above, as shown in FIGS. 7 and 22, both directions from the column 28 in the column beam block body 50 remaining after the beam block body 31 (see FIG. 19-2 (D)) is removed. The beam 52 and the beam 54 are cut so that their weights are different. In this embodiment, since the beam 52 and the beam 54 have the same structure, the weight can be reduced by cutting the beams 52 with different lengths (in this embodiment, the beam 52 is longer than the beam 54). Are different.

  That is, as shown in FIG. 22, the beam 52 and the beam 54 extending from the column 28 are cut so that the position away from the axis center G1 of the column 28 in the plan view becomes the gravity center position G2 of the column beam block body 50. In this dismantling method, the two cutting line S2 portions (see FIG. 8) of the slab 32 are put in such a length during the slab disassembling process described above.

  As shown in FIG. 22, the wire 111 of the crane 112 is hung on the column beam block body 50 (see also FIG. 7). At this time, the position of the hanging tool 113 is set to be closer to the column 28 than the gravity center position G2. Further, a gusset plate (not shown) for joining the bearing wall 63 (see FIG. 7) and the outer pillar 28 is cut. Note that the wire 111 of the crane 112 may be applied before the H-section steel 30A is cut.

  As shown in FIG. 22, the steel pipe 28A on the outer periphery of the column 28 is cut by a cutter, gas fusing, or the like (cutting portion 23C). As shown in FIG. 23, the crane 112 is operated to loosen the suspended state of the wire 111, the column 28 is tilted toward the center of gravity position G2, and a bending stress is generated in the concrete 28B inside the column 28 to generate concrete. Break 28B. 24, after breaking, the column beam block 50 is lifted by the crane 112 (see FIG. 1) and lowered from the transport space 908 (see FIGS. 1 and 4) to the ground floor (FIG. 2B). (See also FIG. 7).

  As shown in FIG. 7, simultaneously with the dismantling work of the outer peripheral column 28, the cutting work of the slab 32 is started in advance by the load cutter 200 on the second floor N-2 of the Nth floor.

(Bearing wall dismantling)
As shown in FIG. 8, the wire 111 is hung on the bearing wall 63. A gusset plate (not shown) that joins the load-bearing wall 63 to the inner column 28 and the lower beam 30 is cut. The load-bearing wall 63 is lifted by the crane 112 and lowered from the transport space 908 (see FIGS. 1 and 4) to the ground floor. Note that the slab 32 is cut with the load cutter 200 on the N-2 floor.

(Internal pillar dismantling)
As shown in FIG. 9, the column beam block body 65 composed of the inner column 28 and the beam 30 is also disassembled in the same manner as the outer peripheral column disassembly process described above. That is, as shown in FIG. 22, the beam 52 and the beam 54 extending from the column 28 are cut so that the position away from the axis center G1 of the column 28 in the plan view becomes the gravity center position G2 of the column beam block body 50. As shown in FIG. 22, the steel pipe 28A on the outer periphery of the column 28 is cut by a cutter, gas fusing, or the like (cutting portion 23C). As shown in FIG. 23, the column 28 is tilted toward the center of gravity position G2 to break the concrete 28B inside the column 28, and is lifted by a crane 112 (see FIG. 1) to be transported space 908 (see FIGS. 1 and 4). To the ground floor.

  Moreover, the joining of the arm member 86 to the fixing device 90 on the Nth floor and the (N-1) th floor is released, and the bolts are loosened or loosened and removed to make the restraining force for restraining the support column 20 weakened. Note that the slab 32 is cut with the load cutter 200 on the N-2 floor.

(Hutdown (registered trademark) process)
As shown in FIG. 10, a hat (registered trademark) is performed.

(Fixing process (outer frame bolting process)
As shown in FIG. 11, arm members 86 and 88 are joined to the fixing devices 90 on the Nth floor-1 and the N-2th floor, and bolts are tightened. At this time, the slab 32 is cut on the Nth floor.

  The details of the above-described (Hutdown (registered trademark) step) and (Fixing step (outer frame bolting step) have already been described in detail with reference to FIGS. 12 and 13, so only the outline will be briefly described here. explained.

(Unloading process of fixing device)
As shown in FIG. 12, the fixing device 90 on the N floor is lifted by a crane 112 and unloaded to the lower floor. In addition, the slab 32 is cut.

  On the N-2 floor, the outer wall panel 34 and the studs are removed. Further, on the N-3 floor, the unloading fixing device 90 is temporarily placed on the slab 32 and then installed.

(Disassembly structure of the jumping part)
Next, the disassembly of the jumping portion (the jumping edge) 78 shown in FIG. 25 will be described. The jumping portion 78 is a portion having a beam, a slab, a wall, or the like on the outer side (outdoor direction) of the outer column 28 (see FIG. 1). If it demonstrates from another viewpoint, the protrusion part will be the edge part of the form of the protrusion which carried outside rather than outer walls, such as a balcony.

  In this embodiment, the hanging tool 113 of the crane 112 moves only to the position P of the root portion of the jumping portion 78. That is, the jumping part 78 is an area outside the work range of the crane 112.

  In the dismantling of the protruding part 78, the slab 32 of the protruding part 78 is supported by the pipe support and the beam 30 is supported by the strong support. Two cutting lines S2 are provided at both ends of the portion corresponding to the beam 30 of the slab 32 in the same manner as described above (beam disassembling process). Similarly, the portion between the cutting lines S2 is removed by applying an impact with a hammer or the like to expose the H-section steel 30A and cut the H-section steel 30A (see FIGS. 18 and 19).

  The hanging tool 113 of the crane 112 is moved to the position P (or the vicinity thereof) which is the movement limit in the outdoor direction, and the wire 111 is applied. The slab 32 is cut along the cutting line S3. Note that this cutting balances the weight so that the center of gravity position G3 of the beam slab block body 77 constituted by the protruding portion 78 and the indoor portion 79 becomes a position P that is the movement limit of the hanging tool 113 in plan view. And cut.

  Then, the beam slab block body 77 is lifted by the crane 112 (see FIG. 1) and lowered from the transport space 908 (see FIGS. 1 and 4) to the ground floor.

  Here, in the present embodiment, the beam slab block body 77 including the protruding portion 78 is cut with a weight balance, but the present invention is not limited to this. The beam block body of the beam 30 including the protruding portion 78 and the slab block body of the slab 32 including the protruding portion 78 may be cut in a weight balance.

  Moreover, you may cut | disconnect the column beam block body containing the jumping part 78 in a weight balance. In the case of a column beam block body, the jumping direction (outdoor direction) in plan view is cut with a weight balance, and in the left-right direction orthogonal to the jumping direction, the position away from the axis center of the column is the center of gravity position. The steel pipe on the outer periphery of the column or the rebar embedded in the vicinity of the column may be cut, the crane may be operated to generate bending stress on the column, and the concrete may be broken (disassembly work of the outer column demolition) (See FIGS. 22-24)).

<Action and effect>
The operation and effect of this embodiment will be described.

(Slab dismantling)
As shown in FIGS. 13 to 17 and the like, in this embodiment, the beam material 100 is stretched between the H-section steel 30A constituting the existing beam 30, and the jack 108 is interposed between the beam material 100 and the slab 32. Provide and support the slab 32. In this state, the slab 32 is disassembled.

  Here, in the case of a construction method in which the slab 32 is supported by the support works arranged in the vertical direction and the slab 32 is disassembled, the support works on the lower floor of the slab 32 to be disassembled.

  On the other hand, the beam material 100 does not interfere with the work by supporting the slab 32 to be disassembled by the beam material 100 and the jack 108 as in the present construction method. Therefore, the dismantling work etc. can be easily performed in advance on the lower floor of the slab 32 to be dismantled. Therefore, the efficiency of the demolition work of the demolition building 10 improves (refer FIGS. 5-12).

  Further, the beam member 100 can be stretched and stretched according to the interval between the beams 30 (H-shaped steel 30A). Therefore, compared with the case where the beam material 100 does not expand and contract in the longitudinal direction, the beam material 100 can be easily passed (see FIG. 14). Therefore, the efficiency of the demolition work of the demolition building 10 is further improved.

  In this embodiment, the beam material 100 uses a peco beam, but is not limited thereto. For example, a holly beam or an AX beam may be used.

(Dismantling of beams)
As shown in FIGS. 18 and 19, two cuts are made in the slab 32 on the H-section steel 30A constituting the beam 30, and the removal portion 29 between the two cuts is impacted with a hammer or the like. The removal portion 29 is removed to expose the H-section steel 30A. And H section steel 30A exposed from the exposed part 27 after the removal part 29 was removed is cut | disconnected.

  Therefore, as compared with the case where the removal portion 29 is removed by rolling with a breaker or the like, the removal portion 29 can be easily removed to expose the H-section steel 30A, and dust and noise are suppressed. Therefore, the efficiency of the demolition work of the demolition building 10 is improved.

  Moreover, the part which remained without cut | disconnecting is cut | disconnected in the state hung with the crane 112 after leaving a part of cross section of H-section steel 30A.

  Therefore, compared with the case where all the H-section steel 30A is cut at a time, the time for hanging by the crane 112 can be shortened. Therefore, the crane 112 can be used efficiently, and as a result, the efficiency of the dismantling work is further improved. In addition, what is necessary is just to obtain | require the site | part and magnitude | size which leave H-section steel 30A (steel material) suitably by structural calculation.

  Moreover, as shown in FIG. 20, it cut | disconnects so that the site | part which remains after the cutting | disconnection of H-section steel 30A may turn into an inverted T shape by lower part 30CT (part) of lower flange part 30D and web 30C. (The web 30C of the H-section steel 30A is cut leaving all or part of it). And by cutting the web 30C of the H-section steel 30A leaving all or a part in this way, it becomes strong against twisting after partly cutting, and as a result, shaking due to twisting after partly cutting is suppressed. Is done.

  In addition, you may leave the upper part of the upper flange part 30B and the web 30C. By cutting in this way, the upper flange portion 30B can be cut from one direction in front.

  Further, by leaving the lower flange portion 30D or the upper flange portion 30B in this way, the rigidity of the H-section steel 30A after cutting the matching portion is effectively improved.

  Further, as shown in FIG. 21, one end 30BT of the upper flange portion 30B and the other end 30DT of the lower flange portion 30D are left so that the cut surface of the H-shaped steel material 30A has a Z shape. By cutting, the rigidity in the diagonal direction of the H-section steel 30A after cutting the coincidence portion is effectively improved.

(Dismantling the pillar)
As shown in FIGS. 22 to 24, the beam 30 extending from the column 28 is cut so that the position away from the axial center G1 of the column 28 in the plan view is the center of gravity position G2, and provided on the outer periphery of the column 28. The steel pipe 28A is cut. And the crane 112 hung on the column beam block body 50 is operated, the wire 111 is loosened, the bending stress is generated in the column 28, and the internal concrete 28B is fractured.

  Therefore, for example, it is not necessary to break the concrete 28B inside the pillar 28 by protruding from the side with a breaker, so that the pillar 28 can be easily cut. Therefore, the efficiency of the demolition work of the demolition building 10 is improved.

  In the present embodiment, the present invention is applied to the CFT column 28 in which the high-strength concrete 28B is densely filled in the cylindrical steel pipe 28A. However, the present invention is not limited to this. It can also be applied to reinforced concrete columns (RC columns). Specifically, the reinforcing bar embedded in the vicinity of the outer periphery of the column is cut to leave the concrete inside the column. In this state, the crane 112 placed on the column beam block body 50 is operated to loosen the wire 111 to generate a bending stress on the column, thereby breaking the concrete inside the column.

  In the dismantling work, since the cutting position can be set freely, eccentric cutting with the position away from the center of the axis of the column as the center of gravity is possible.

(Dismantling of the jumping part)
As shown in FIG. 25, the beam slab block body 77 composed of the jumping portion 78 and the indoor portion 79 is cut with a weight balance so that the center of gravity position G3 of the beam slab block body 77 becomes the position of the hanger 113.

  Therefore, the beam slab block body 77 can be lifted without taking up the suspension. In particular, the beam slab block body 77 can be lifted without being lifted by a reach balancer or the like even when the lifting tool 113 of the crane 112 does not reach like the jumping portion 78. Therefore, the efficiency of the demolition work of the demolition building 10 is improved.

  As described above, in the dismantling work, since the cutting position can be set freely, balanced cutting with a balanced weight is possible.

  Further, in the case of the column beam block body including the jumping portion 78, the jumping direction (outdoor direction) in plan view is cut while taking a weight balance, and the horizontal direction intersecting the jumping direction is a position away from the axis center of the column Cut so that is at the center of gravity. And the steel pipe of the outer periphery of a pillar, or the reinforcement embed | buried near the outer periphery is cut | disconnected, a bending stress is generated in a pillar by operating a crane, and the concrete inside a pillar can be fractured | ruptured.

<Others>

  The present invention is not limited to the above embodiment.

  For example, in the said embodiment, although the steel frame which comprises the beam 30 was H-section steel, it is not limited to this. Steel frames other than H-section steel may be used.

  Moreover, although the said embodiment demonstrated in the example which applied this invention to the "HAT DOWN (trademark) construction method", it is not limited to this. The present invention can be widely applied to the dismantling of structures. Furthermore, the present invention is applied to structures of various structures and scales such as reinforced concrete structures, steel structures, steel reinforced concrete structures, CFT structures (Concrete-Filled Steel Tubes), and mixed structures thereof. can do.

  Moreover, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10 Demolition building (example of structure)
30 beam 30A H-section steel (an example of steel)
32 slab 108 jack (an example of a support member)
100 beet material (an example of a support beam)

Claims (2)

A first step of placing a support beam on the steel material constituting the beam and passing the support beam between the steel materials;
A second step of providing a support member between the support beam and the slab to support the slab;
A third step of dismantling the slab;
A structure dismantling method comprising The support beam is a member that can expand and contract in the longitudinal direction,
The structure demolition construction method according to claim 1.