Method for demolishing existing building

Abstract

To provide a method for demolishing an existing building using heavy machinery for demolition.SOLUTION: A method for demolishing an existing building comprises: a step S1 in which a plurality of running boards 20 for heavy machinery are laid on a floor surface of a floor to be demolished of an existing building 1 so as to straddle between adjacent ones of girders 11 and beams 12 of the floor to be demolished, and the girders 11 and the beams 12 of the floor to be demolished are supported by support members 30 from a floor surface of an immediately lower floor; a step S2 of demolishing a floor to be demolished with a crusher 42 of a heavy machinery 40A, 40B for demolishing while the heavy machinery 40A, 40B for demolishing travels on the running board 20 for heavy machinery; a step S3 in which the running board 20 for heavy machinery is obliquely erected between a floor surface to be demolished and a floor surface of a floor immediately below the floor to be demolished, and a demolishing heavy machinery 40A, 40B are made to travel on the obliquely erected walking plate 20 for heavy machinery and are lowered to the floor immediately below the floor to be demolished; and a step S4 in which the step S1 to the step S3 are repeated toward the lower layer.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for demolishing an existing building. [Background technology]

[0002] BACKGROUND ART It has been proposed to support demolition heavy machinery with a girder-type support device when demolishing an existing building (see Patent Documents 1 and 2). Patent Document 1 proposes a girder-type excavator support device that is installed across adjacent floor beams on a floor to be demolished. The girder-type excavator support device includes a girder frame with an H-shaped cross section that has a work surface on which the excavator's blade rests, a non-slip surface welded to the work surface of the girder frame, and reinforcing bars and support plates installed at the bottom of the girder frame.

[0003] Patent Document 2 proposes a building demolition method using a girder-type support device. Specifically, a shovel is used to form a movable opening in the slab of an upper floor. Next, a girder-type support device is hung diagonally from the lower floor to the movable opening. Next, the shovel is moved from the movable opening to the upper floor along the girder-type support device. This process is repeated until the shovel is moved to the roof. After that, the shovel begins demolishing the building from the roof. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-371713 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-48586 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a method for demolishing an existing building using demolition machinery. [Means for solving the problem]

[0006] The method for demolishing an existing building according to the first aspect of the present invention is a method for demolishing an existing building (for example, existing building 1 described below), and includes a first step (for example, step S1 described below) of laying a plurality of erection members (for example, heavy equipment walkways 20 described below) on the floor surface of a floor (for example, rooftop floor described below) of the existing building that is to be demolished, straddling adjacent ones of floor beams (for example, main beams 11 and minor beams 12 described below) of the floor that is to be demolished, and supporting the floor beams of the floor that is to be demolished with support materials (for example, support materials 30 described below) from the floor surface of a floor immediately below the floor that is to be demolished (for example, nth floor described below); The demolition method is characterized by comprising: a second step (e.g., step S2 described below) of demolishing the floor to be demolished using a crusher (e.g., crusher 42 described below) of the demolition heavy equipment while the demolition heavy equipment (40A, 40B) travels on the erection members; a third step (e.g., step S3 described below) of erecting erection members obliquely between the floor surface of the floor to be demolished and the floor surface of the floor immediately below the floor to be demolished, and causing the demolition heavy equipment to travel on the erection members erected obliquely and lowering it to the floor immediately below the floor to be demolished; and a fourth step (e.g., step S4 described below) of repeating steps 1 to 3 toward lower floors.

[0007] According to this invention, multiple erection members are installed between the floor beams of the floor to be demolished, and the floor beams of the floor to be demolished are supported from below by support materials. Then, a self-propelled demolition machine moves on the erection members while demolishing the floor to be demolished. Therefore, the load of the demolition machine is transmitted in the order of erection members, beams, and columns. Therefore, even if the floor slabs of the floor to be demolished are weak, the existing building can be easily demolished from the upper floors to the lower floors using the self-propelled demolition machine. Furthermore, because the floor beams of the floor to be demolished are supported from below by support materials, the erection members can be reliably supported by the floor beams of the floor to be demolished without extensive reinforcement of the existing structure.

[0008] The second invention is a method for demolishing an existing building, characterized in that in the third step, the lower end of the diagonally erected erection member is temporarily fixed to the floor surface of the floor directly below the floor to be demolished with a post-installed anchor.

[0009] According to this invention, an erection member is erected diagonally between the floor slab of the floor to be demolished and the floor slab of the floor immediately below the floor to be demolished, and the lower end of this erection member is temporarily fixed to the floor surface of the floor immediately below the floor to be demolished with a post-installed anchor. This prevents the diagonal erection member from shifting when the demolition heavy equipment is lowered by running it over the diagonal erection member, so the demolition heavy equipment can be lowered safely to the floor immediately below. [Effects of the Invention]

[0010] According to the present invention, a method for demolishing an existing building using demolition machinery can be provided. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a vertical cross-sectional view of a structural body of an existing building to which a method for demolishing an existing building according to one embodiment of the present invention is applied. [Figure 2] This is a plan view of the structure of an existing building. [Figure 3] 1 is a flowchart of the demolition procedure for an existing building. [Figure 4] This is an explanatory diagram of the demolition procedure for an existing building (Part 1, a longitudinal cross-section of the existing building with erection members and support materials in place). [Figure 5] This is an explanatory diagram of the demolition procedure for an existing building (Part 2, a floor plan of the existing building with erection members and support materials in place). [Figure 6] This is an explanatory diagram of the demolition procedure for the existing building (part 3, cross section AA of the existing building with the support material in place in Figure 4). [Figure 7] This is an explanatory diagram of the demolition procedure for the existing building (part 4, cross-sectional view of the existing building with the support material in place as shown in Figure 6). [Figure 8] This is an explanatory diagram of the demolition procedure for an existing building (part 5, diagram showing the demolition status of the floor to be demolished). [Figure 9] This is an explanatory diagram of the demolition procedure for an existing building (part 6, diagram showing the movement of demolition machinery). [Figure 10]FIG. 10 is an enlarged view of the area surrounded by the dashed line C in FIG. 9. [Figure 11] FIG. 11 is a plan view of FIG. [Figure 12] A vertical cross-sectional view showing the state in which support materials are placed on the structure of an existing building in a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention relates to a method for demolishing an existing building that allows for easy demolition of an existing building from upper floors to lower floors using demolition machinery, even if the floor slabs on the floors to be demolished are weak. The method also provides a heavy machinery runway (construction member) for use in the method. In this method, the positions of floor beams on the floor to be demolished are marked, heavy machinery runways are laid between adjacent floor beams, and the floor beams of the floor to be demolished are supported by support materials on the floor surface of the floor directly below the floor to be demolished. In this state, the floor to be demolished is demolished by running the demolition machinery over the heavy machinery runway. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a vertical cross-sectional view of the structure of an existing building 1 to which a method for demolishing an existing building according to one embodiment of the present invention is applied. Fig. 2 is a plan view of the structure of the existing building 1. The existing building 1 is an n-story building made of reinforced concrete, and comprises columns 10, main girders 11 as floor beams provided between the tops of the columns 10, secondary girders 12 as floor beams provided between the main girders 11, and a floor slab 13 supported by the main girders 11 and secondary girders 12.

[0013] The procedure for demolishing the existing building 1 will be described below with reference to the flowchart of FIG. In step S1, as shown in Figs. 4 to 7, a heavy machine running board 20 is laid as an erection member, and a support material 30 is erected. Specifically, multiple heavy equipment walkways 20 are laid on the floor surface of the rooftop floor (R floor), which is the floor to be demolished of the existing building 1, spanning between adjacent girders 11 and joists 12 of the rooftop floor. Specifically, the positions of the girders 11 are marked on the floor surface of the rooftop floor (R floor), and multiple heavy equipment walkways 20 are laid out in the marked positions. In addition, the girders 11 and joists 12 of the floor to be demolished are supported by support materials 30 from the floor surface of the nth floor, the floor directly below the R floor. These support materials 30 are erected for the three floors directly below the rooftop floor, which is the floor to be demolished.

[0014] Furthermore, self-propelled demolition machines 40A and 40B are hoisted by a large lifting machine and placed on the heavy machine runway 20 on the rooftop floor, which is the floor to be demolished. Demolition machines 40A and 40B are backhoes 41 with crushers 42 attached as attachments.

[0015] As shown in Figures 10 and 11, the heavy equipment running board 20 comprises a floor board 21 extending in a predetermined direction, side boards 22 provided at both ends of the width of the floor board 21, three H-shaped steel beams (not shown) provided on the underside of the floor board 21 and extending in the length direction of the floor board 21, a pair of stiffening plates (not shown) provided on the underside of the floor board 21 and at both ends of the H-shaped steel beams in the length direction, and a tie rod (not shown) connecting the pair of stiffening plates together.

[0016] In step S2, as shown in Figure 8, demolition heavy equipment 40A, 40B travels on heavy equipment running boards 20 while crushers 42 of demolition heavy equipment 40A, 40B demolish the rooftop floor, which is the floor to be demolished. At this time, although not shown, demolition debris is laid between heavy equipment running boards 20 to prevent the heavy equipment running boards 20 from shifting.

[0017] In step S3, as shown in FIG. 9, demolition heavy machinery 40A and 40B are lowered onto the floor of the rooftop floor, which is the floor to be demolitioned, and onto the nth floor, which is the floor immediately below the floor to be demolitioned. Specifically, a heavy equipment running board 20 is erected and temporarily fixed diagonally between the floor surface of the rooftop floor, which is the floor to be demolished, and the floor surface of the nth floor, which is the floor directly below the floor to be demolished. That is, as shown in Figures 10 and 11, a heavy equipment running board 20 is placed on the floor slab 13 of the nth floor as a stopper in a direction intersecting the diagonal heavy equipment running board 20, and the lower end of the diagonal heavy equipment running board 20 is engaged with this heavy equipment running board 20 that serves as a stopper. Then, post-installed anchors 50 are driven into the side of this heavy equipment running board 20 that serves as a stopper to serve as a slip-stop material. Then, demolition heavy machinery 40A, 40B is run on heavy machinery running board 20 erected at an angle and lowered to the nth floor, which is the floor immediately below the floor to be demolition. In step S4, steps S1 to S3 are repeated toward the lower floors of the existing building 1.

[0018] According to this embodiment, the following effects are obtained. (1) Multiple heavy equipment walkways 20 are installed between the girders 11 and girders 12 of the floors to be demolished, and the girders 11 and girders 12 of the floors to be demolished are supported from below by support materials 30. Self-propelled demolition equipment 40A and 40B then travel on the heavy equipment walkways 20 to demolish the floors to be demolished. Therefore, the load of the demolition equipment 40A and 40B is transmitted in the order of the heavy equipment walkways 20, the girders 11 and girders 12, and the columns 10. Therefore, even if the floor slabs 13 of the floors to be demolished are weak, the existing building 1 can be easily demolished from the upper floors to the lower floors using the self-propelled demolition equipment 40A and 40B. Furthermore, because the girders 11 and girders 12 of the floors to be demolished are supported from below by support materials 30 across three floors, the heavy equipment walkways 20 can be reliably supported by the girders 11 and girders 12 of the floors to be demolished without extensive reinforcement of the existing structure.

[0019] (2) A heavy equipment running board 20 is erected diagonally between the floor slab 13 of the floor to be demolished and the floor slab 13 of the floor directly below the floor to be demolished, and post-installed anchors 50 are driven into the lower end of this diagonally erected heavy equipment running board 20 to prevent it from shifting. This prevents the diagonal heavy equipment running board 20 from shifting when the demolition heavy equipment 40A, 40B is driven over and lowered on the diagonal heavy equipment running board 20, allowing the demolition heavy equipment 40A, 40B to be lowered safely to the floor directly below.

[0020] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. For example, in the above-described embodiment, the girders 11 and the girders 12 are supported from below by support materials 30 across three floors. However, this is not limiting. Support materials 30 may be provided on only one floor, across two floors, or across four or more floors depending on the strength of the existing skeleton of the existing building 1 and the weight of the demolition machinery. Also, as shown in FIG. 12 , on the (n-2)th floor, support materials 30 supporting the girders 12 may not be provided, and a carry-out space S for transporting the demolished debris may be secured. In this case, H-shaped steel 51 is placed across the girders 11 on the floor surface of the (n-1)th floor, which is the floor above the carry-out space S, and post-installed anchors 52 are used to prevent shear stress on the H-shaped steel 51. Furthermore, support materials 30 supporting the girders 12 are installed on the H-shaped steel 51. [Explanation of symbols]

[0021] 1…Existing building 10…Column 11…Gallery (floor beam) 12...Small beam (floor beam) 13...Floor slab 20... Heavy machinery walkway (construction member) 21... Floor board 22... Side board 30...Support material 40A, 40B... Demolition heavy equipment 41... Backhoe 42... Crusher 50... Post-installed anchor 51... H-beam 52... Post-installed anchor

Claims

1. A method for demolishing an existing building, comprising: a first step of laying a plurality of erection members on the floor surface of the floor to be demolished of the existing building, straddling adjacent ones of the floor beams of the floor to be demolished, and supporting the floor beams of the floor to be demolished with support materials from the floor surface of the floor directly below the floor to be demolished; A second step of demolishing the floor to be demolished by a crusher of the demolition heavy equipment while the demolition heavy equipment is traveling on the erection members; a third step of erecting an erection member obliquely between the floor surface of the floor to be demolition and the floor surface of the floor directly below the floor to be demolition, and running the demolition heavy machine on the erection member obliquely erected, and lowering it to the floor directly below the floor to be demolition; A method for demolishing an existing building, comprising a fourth step of repeating the first to third steps toward lower floors.

2. The method for demolishing an existing building as described in claim 1, characterized in that in the third step, the lower end of the diagonally erected erection member is temporarily fixed to the floor surface of the floor immediately below the floor to be demolished with a post-installed anchor.

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