Building renovation methods

Abstract

To provide a building repair method capable of changing the height of floor structure parts of multiple floors at a low cost and in a short construction period by utilizing existing floor structure parts and an existing skeleton supporting the same.SOLUTION: A building repair method for changing the height of a floor structure part 2 without changing the height of a roof structure part 3 in an existing skeleton K of a building has a batch floor height changing process of removing the floor structure parts 2 of multiple floors, whose height is to be changed, from the existing skeleton K while including a pole 1 coupling the floor structure parts each other, moving them by batch along a height direction and fixing them again to the existing skeleton K at a destination height.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a building renovation method that can be suitably used when changing the use of the interior of a building, and in particular to a building renovation method for changing the height of a floor structure of an existing building frame without changing the height of a roof structure. [Background technology]

[0002] As this type of building renovation method, Patent Document 1 describes a building renovation method having a floor height changing step of separating the floor structure of one floor to be changed in height from the existing structure, moving it along the height direction, and re-fixing it to the existing structure at the new height. With this building renovation method, the height of the floor structure of one floor to be changed can be changed by using the existing floor structure and the existing structure that supports it as it is. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-063793 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when changing the use of the entire building, there are cases where it is desired to change the height of the floor structure across multiple floors, not just one floor inside the building. In such cases, the building renovation method described in Patent Document 1 requires a floor height change process to be performed for each floor whose height is to be changed, which leads to problems of increased costs and longer construction periods.

[0005] In view of this situation, the main objective of the present invention is to provide a building renovation method that can change the height of the floor structures of multiple floors that are to be changed at low cost and in a short construction period, while utilizing the existing floor structures and the existing framework that supports them. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a building renovation method for changing the height of a floor structure part without changing the height of a roof structure part in an existing skeleton of a building, The floor structure parts of the multiple floors to be changed in height are separated from the existing structure, including the columns connecting them, and moved in a lump along the height direction, and then re-fixed to the existing structure at the new height. death, The floor structure of the plurality of floors to be changed in height is divided into a plurality of divided blocks each including the pillar in a plan view, and the collective floor height change process is executed for each divided block in sequence. The point is to

[0007] According to this configuration, when it is desired to change the height of the floor structure parts across multiple floors, the floor structure parts of the multiple floors to be changed in height can be collectively changed. floor By executing the height changing process, the height of the floor structure parts of multiple floors can be changed all at once, including the columns connecting them to each other. Therefore, the height of the floor structure parts of the multiple floors to be changed can be changed at low cost and in a short construction period while utilizing the existing floor structure parts and the existing framework supporting them as is. Furthermore, according to this configuration, the floor structure parts of the multiple floors to be changed in height can be collectively floor The height change is performed for each divided block including the pillars in plan view, so it is a batch process that can be performed at once. floor The target range of the height change process can be reduced. This makes it possible to prevent a significant decrease in the rigidity of the entire building during the collective floor height change process, which temporarily separates the target range of the existing structure, and makes it possible to change the height of the floor structure of multiple floors more safely. In addition, the difficulty of the work can be reduced, improving workability, and equipment such as lifting jacks and temporary columns can be used for the collective work of each divided block. floor The amount of equipment can be reduced by gradually reusing it during the height changing process. A second characteristic feature of the present invention is that the collective floor height changing process is carried out sequentially while repurposing materials for each divided block.

[0010] In the present invention, the lumped structure is applied to a part of a height change area in a plan view of the existing structure. floor A height changing step is carried out, floorThe floor structure parts of the plurality of floors of the height change area in which the height change has been executed, floor A step may be formed between the floor structure portions of the multiple stories of the non-height changing areas in the other parts in a plan view where no height change is performed.

[0011] According to this configuration, the height of a part of the existing structure in plan view can be changed at once. floor By executing the height changing process, steps that can be suitably used for purposes such as truck berths can be formed across multiple floors in one go between floor structure portions of height changing areas and floor structure portions of non-height changing areas on multiple floors of a building.

[0012] The third characteristic configuration of the present invention is the above-mentioned floor When supporting the load of the floor structure parts of the multiple floors to be changed in height during the height changing process, The feature is that a lifting jack is placed at the lower end of the column connecting the floor structure parts of the multiple floors to be changed in height, and a temporary column is provided to support the cut end parts on the outer periphery of the floor structure parts of the multiple floors to be changed in height, and a lifting jack is placed at the lower end of the temporary column.

[0013] According to this configuration, floor During the height change process, the lifting jacks arranged at the lower ends of the columns connecting the floor structure parts of the multiple floors to be changed in height support the load on the center side of the floor structure parts of the multiple floors, while the lifting jacks arranged at the lower ends of the temporary columns supporting the cut ends on the outer periphery of the floor structure parts of the multiple floors support the cut ends on the outer periphery of the floor structure parts of the multiple floors, which become unstable cantilever-like. Therefore, the entire floor structure parts of the multiple floors to be changed in height can be properly supported, and the entire structure can be collectively floor This makes it possible to prevent damage, etc. from occurring to the floor structure parts of the multiple floors that are the subject of height changes during the height changing process. A fourth characteristic configuration of the present invention is that the collective floor height changing process is carried out sequentially while repurposing the equipment including the temporary columns and the lifting jacks for each divided block. [Brief description of the drawings]

[0014] [Figure 1] Schematic diagram of the building before the floor height change [Diagram 2] A schematic diagram showing the preparation process for the collective floor height change process. [Diagram 3] A schematic diagram showing the cutting process of the integrated floor height change process [Figure 4] A schematic diagram showing the moving and fixing process of the collective floor height change process [Diagram 5] Schematic diagram of the building after changing the floor height [Figure 6] FIG. 1 is a schematic diagram showing the planar arrangement of the lifting jacks at the lower end of the column to be cut. [Figure 7] A diagram showing the planar arrangement of height change areas and division blocks. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of a building renovation method according to the present invention will be described with reference to the drawings. Figure 1 shows the building before renovation. This building is constructed as a multi-story building, and includes an existing structure K, including multiple columns 1, multiple floor structural parts (floor parts) 2 supported by the multiple columns 1, and a roof structural part (roof part) 3 supported by the upper ends of the multiple columns 1.

[0016] As column 1, various structures can be used, such as steel frame construction (S construction), reinforced concrete construction (RC construction), steel reinforced concrete construction (SRC construction), concrete filled steel pipe construction (CFT construction), and a composite structure of these.

[0017] The floor structure 2 is composed of a beam structure assembled with girders installed between adjacent columns 1 and small beams installed between adjacent girders, and a floor slab of reinforced concrete or the like supported by the beam structure. The beam structure can also be of various constructions such as steel, reinforced concrete, and steel reinforced concrete.

[0018] The roof structure 3 is composed of a roof beam structure assembled with roof girders installed between adjacent columns 1 and small roof beams installed between adjacent roof girders, and a roof slab and metal roof supported by the roof beam structure. The roof beam structure can also be made of various structures such as steel, reinforced concrete, and steel reinforced concrete.

[0019] In this building renovation method, as shown in Figures 2 to 5, floor structure parts 2 of multiple floors as parts located directly below a roof structure part 3 in an existing skeleton K inside a building are set as height change targets. Then, a collective floor height change process is executed in which the floor structure parts 2 of the multiple floors as height change targets are separated from the existing skeleton K, including the columns 1 connecting them to each other, moved downward in the height direction as a whole, and re-fixed to the existing skeleton K at the height of the moved destination, so that the heights of the floor structure parts 2 as height change targets can be changed collectively across multiple floors to a new height lowered from the existing height, as shown in Figure 5.

[0020] In addition, in this building renovation method, the height change area K1 in the plan view of the existing structure K is changed at once. floor By executing the height change process, floor The floor structure part 2 of the height change area K1 where the height change process has been performed, floor A step D (see Figure 5) that can be used for a truck berth, etc., can be formed in one go across multiple floors between the floor structure part 2 of the non-height changing area K2 in the plan view where the height changing process is not performed.

[0021] Below, we will explain each step of the collective floor height changing process (preparation step, cutting step, moving and fixing step).

[0022] (preparation process) In this preparation process, as shown in Fig. 2, in order to lower the floor structure 2 in each of the subsequent processes without causing damage, etc., hydraulic or other lifting jacks J1 are installed at the lower ends of multiple existing columns 1 (hereinafter, sometimes referred to as columns 11 to be cut) that connect the floor structure 2 of the multiple floors to be changed in height (the third floor in the illustrated example) at the center side in a plan view. Furthermore, temporary columns 4 are provided to support the cut ends 21 (see Fig. 3) on the outer periphery of the floor structure 2 of the multiple floors to be changed in height across the multiple floors, and lifting jacks J2 are also installed at the lower ends of the temporary columns 4.

[0023] Incidentally, as shown in Figures 2 and 6, four lifting jacks J1 on the lower end side of the column to be cut 11 are arranged to surround the column to be cut 11 in plan view via large steel brackets b1 protruding from both the left and right sides of the column to be cut 11 and steel support bases b2 attached to the lower ends of the brackets b1 in an orientation extending in a direction intersecting the left-right direction (front-to-back direction) in plan view. Therefore, by operating and adjusting each of the four lifting jacks J1 in the moving and fixing process described later, it is possible to adjust the erection of the column to be cut 11 after changing the floor height.

[0024] 2, a temporary support structure 5 is constructed to transmit the load of the roof structural part 3 to the columns 1 on both outer sides (hereinafter, sometimes referred to as non-cut columns 12) so as to prevent deformation, etc., from occurring in the roof structural part 3 that remains without changing the height above the floor structural parts 2 of the multiple floors to be changed in the subsequent processes. In this embodiment, the temporary support structure 5 is configured by connecting the upper part of the non-cut column 12 to the part directly above the cut part of the column to be cut 11, which is the part located below it, with a steel-framed temporary brace 51, and by connecting the parts directly above the cut parts of adjacent columns to be cut 11 with steel-framed temporary cross members 52.

[0025] (cutting process) In the cutting process which is carried out following the preparation process, as shown in FIG. 3, the load of the floor structure parts 2 of the multiple floors to be changed in height is transferred to each lifting jack J1, J2, while the floor structure parts 2 of the multiple floors are separated from the existing structure K, including the columns 11 to be cut which connect them to each other.

[0026] Specifically, in this cutting process, the cutting point (first cutting point S1) on the lower end of the column to be cut 11 connecting the floor structure sections 2 of the multiple floors to be changed in height, the cutting point (second cutting point S2) on the outer periphery of the floor structure sections 2 of the multiple floors to be changed in height, and the cutting point (third cutting point S3) on the upper end of the column to be cut 11 connecting the floor structure sections 2 of the multiple floors to be changed in height are cut in a state that allows reconnection. At this time, at the first cutting point S1 on the lower end side of the column 11 to be cut, two points above and below with a gap corresponding to the lowering dimension (height change dimension) of the floor structure part 2 are cut to remove the intermediate column part 11a, and a space is formed on the lower end side of the column 11 to be cut to provide a movement allowance for lowering the floor structure part 2. In this manner, the floor structure portion 2 of the multiple stories to be changed in height is separated from the existing framework K so as to be freely lowered.

[0027] Incidentally, the cutting order is preferably the third cutting point S3 at the upper end of the column 11 to be cut, the first cutting point S1 at the lower end of the column 11 to be cut, and the second cutting point S2 at the outer periphery of the floor structure 2 of the floors to be changed in height, in order to keep the behavior of the part to be cut during cutting and the axial force introduced to the lifting jacks J1 and J2 within an expected range. Also, the cutting order of the second cutting points S2 on each floor can be, for example, in the order of the floors from the lower floor side to the upper floor side, in which case the axial force introduced to the lifting jack J2 during cutting can be checked in sequence for each floor to be cut.

[0028] (moving / fixing process) In the moving and fixing process which is carried out following the cutting process, as shown in FIG. 4, a lifting jack J1 installed at the lower end of the column 11 to be cut which connects the central sides of the multi-story floor structure parts 2 to be changed in height, and a lifting jack J2 installed at the lower end of the temporary column 4 which supports the cut end parts 21 of the multi-story floor structure parts 2 are both operated substantially simultaneously, and the multi-story floor structure part 2 is lowered to the target height position while the entire multi-story floor structure part 2 is supported by the lifting jacks J1 and J2.

[0029] Thereafter, as shown in FIG. 5, the cut ends 21 of the multi-story floor structure 2 are reconnected (rejoined) to the uncut columns 12 of the existing framework K by welding or the like at the height after the movement. In addition, the cut ends of the first cutting point S1 on the lower end side of the column 11 to be cut, which connects the floor structure sections 2 of multiple floors, are directly reconnected (rejoined) by welding, filling with grout, etc. after the erection of the column 11 to be cut is adjusted using four lifting jacks J1 (see Figure 6). Furthermore, between the cut ends of the second cutting points S2 on the upper end side of the cutting target columns 11 that connect the floor structure parts 2 of multiple floors, intermediate column parts 11b corresponding to the lowering dimension of the floor structure parts 2 are interposed and indirectly rejoined by welding, grout filling, etc. Note that the intermediate column parts 11a removed in the cutting process may be used as the intermediate column parts 11b.

[0030] Then, the temporary materials and equipment such as the temporary columns 4, the temporary support structures 5, and the lifting jacks J1, J2 are removed. In this manner, the height of the floor structure 2 of the existing framework K can be changed from the existing height to the new height across multiple floors all at once.

[0031] Furthermore, in this building renovation method, as shown in Fig. 7, the floor structure portion 2 of the multiple floors to be changed in height is divided into multiple divided blocks B each including a column 1 in a plan view, and the above-mentioned collective floor height change process is performed for each divided block B. In this embodiment, the multiple divided blocks B are divided into a central side divided block Bc arranged on the center side of the building in a plan view, and a pair of outer periphery side divided blocks Bo arranged on the outer periphery side of the building in a state in which the central side divided block Bc is sandwiched between them in a plan view. Then, the collective floor height change process is performed in the order of one outer periphery side divided block Bo, the other outer periphery side divided block Bo, and the central side divided block Bc, while reusing temporary materials and equipment such as temporary columns 4, temporary support structures 5, and lifting jacks J1 and J2, as shown in Figs. 2 to 5.

[0032] In this way, by executing the collective floor height change process for each divided block B, floor The target range of the height change process is reduced, and floorIt is possible to prevent a significant decrease in the rigidity of the existing structure K during the height changing process. Furthermore, it is possible to reduce the difficulty of the work and improve workability, and to reduce the amount of temporary materials and equipment such as the temporary columns 4, the temporary support structure 5, and the lifting jacks J1 and J2.

[0033] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0034] (1) In the above embodiment, floor In the height changing process, an example has been shown in which the floor structure parts 2 of the multiple floors to be changed in height are lowered and then re-fixed to the existing structure K at the height after lowering, but it is also possible to raise the floor structure parts 2 of the multiple floors to be changed in height and then re-fix them to the existing structure K at the height after raising.

[0035] (2) In the above embodiment, the building is divided into a plurality of divided blocks B each including a pillar 1 in plan view. Although the example shows a case where the collective floor height change process is performed for each divided block B, depending on the scale and structure of the floor structure part 2 of the multiple floors to be changed in height, it is possible to perform the process for all of them at once without dividing them into divided blocks B. floor A height changing step may be performed. [Explanation of symbols]

[0036] 1 Pillar 2 Floor structure 21 Cut end 3 Roof structure 4 Temporary Pillars B Split block D. Step J1 Lifting jack J2 Lifting jack K Existing frame K1 Height change area K2 Non-height change area

Claims

1. A building renovation method for changing the height of a floor structure without changing the height of a roof structure in an existing building structure, comprising: A collective floor height changing process is provided in which the floor structure parts of the plurality of floors to be changed in height are separated from the existing structure, together with the columns connecting them to each other, and moved in a collective manner along a height direction, and then re-fixed to the existing structure at the height of the moved location; A building renovation method comprising: dividing the floor structure of multiple floors to be subject to height changes into multiple divided blocks each including the columns when viewed in a plan view; and sequentially executing the collective floor height change process for each divided block.

2. The building renovation method according to claim 1 , wherein the collective floor height change process is carried out sequentially while repurposing materials for each divided block.

3. When supporting the load of the floor structure parts of the multiple floors to be changed in height during the execution of the collective floor height changing process, A building renovation method as described in claim 1 or 2, comprising the steps of: placing a lifting jack on the lower end side of the column connecting the floor structure portions of the multiple floors to be changed in height; and providing a temporary column supporting the cut end portions on the outer periphery of the floor structure portions of the multiple floors to be changed in height; and placing a lifting jack on the lower end side of the temporary column.

4. The building renovation method according to claim 3, wherein the collective floor height changing process is carried out sequentially while repurposing equipment including the temporary columns and the lifting jacks for each divided block.

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