JP7652557B2 - Building renovation methods - Google Patents

Description

The present invention relates to a building renovation method that can be used effectively when changing the use of the interior of a building, and in particular, to a building renovation method that changes the height of the floor structure of an existing building frame without changing the height of the roof structure.

As an example of this type of building renovation method, Patent Document 1 describes a building renovation method that has a floor height change process in which the floor structure of a floor to be changed is separated from the existing structure, moved along the height direction, and re-fixed to the existing structure at the new height. With this building renovation method, the height of the floor structure of a floor to be changed can be changed by using the existing floor structure and the existing structure that supports it as is.

JP 2015-063793 A

However, when changing the use of the entire building, it may be necessary 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 carried out for each floor whose height is to be changed, which can lead to increased costs and longer construction periods.

In light 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 structure of multiple floors that are the subject of height changes at low cost and in a short construction period while still utilizing the existing floor structure and the existing framework that supports it.

A 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,
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 ;
The floor structure portions of the multiple floors to be subjected to height changes are divided into a plurality of divided blocks each including the columns in a plan view, and the collective floor height changing process is carried out sequentially for each of the divided blocks .

According to this configuration, when it is desired to change the height of floor structure parts across multiple floors, a collective floor height change process can be executed on the floor structure parts of the multiple floors whose heights are to be changed, thereby making it possible to change the height of the floor structure parts of the multiple floors 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.
Furthermore, according to this configuration, the collective floor height change of the floor structure parts of the multiple floors to be changed in height is performed for each of the multiple divided blocks that each include a column in a plan view, so that the target range of the collective floor height change process to be performed at one time can be reduced. Therefore, it is possible to prevent a significant decrease in the rigidity of the entire building during the collective floor height change process in which the target range of the existing structure is temporarily separated, and the height of the floor structure parts of the multiple floors can be changed more safely. In addition, the difficulty of the work can be reduced to improve workability, and the amount of equipment can be reduced by sequentially reusing equipment such as lifting jacks and temporary columns in the collective floor height change process for each divided block.
A second characteristic feature of the present invention is that the collective floor height changing step is carried out sequentially while repurposing materials for each divided block.

In the present invention, the collective floor height change process may be performed on a part of a height change area in a planar view of the existing structure, and a step may be formed between the floor structure portion of multiple floors of the height change area where the collective floor height change has been performed and the floor structure portion of multiple floors of the other part of a non-height change area in a planar view where the collective floor height change is not performed.

According to this configuration, by executing a collective floor height change process for a portion of the height change area in a plan view of an existing structure, steps that can be suitably used for purposes such as truck berths can be formed in a single step across multiple floors between the floor structure parts of the height change area and the floor structure parts of the non-height change area on multiple floors of a building.

A third characteristic configuration of the present invention is a method for supporting the load of the floor structure parts of the plurality of floors to be changed in height during the collective floor height changing process,
The feature is that a lifting jack is placed at the lower end of the column that connects 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.

According to this configuration, during the collective floor height changing 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, and 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 cantilevered. Therefore, the entire floor structure parts of the multiple floors to be changed in height can be properly supported, and damage to the floor structure parts of the multiple floors to be changed in height can be suppressed during the collective floor 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 equipment including the temporary columns and the lifting jacks for each divided block.

Schematic diagram of the building before the floor height change A schematic diagram showing the preparation process for the collective floor height change process. A schematic diagram showing the cutting process of the integrated floor height change process A schematic diagram showing the moving and fixing process of the collective floor height change process Schematic diagram of the building after changing the floor height FIG. 1 is a schematic diagram showing the planar arrangement of the lifting jacks at the lower end of the column to be cut. A diagram showing the planar arrangement of height change areas and division blocks.

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

Column 1 can be made of various structures such as steel frame (S), reinforced concrete (RC), steel reinforced concrete (SRC), concrete filled steel pipe (CFT), or a combination of these.

The floor structure 2 is composed of a beam structure that includes girders that are installed between adjacent columns 1 and small beams that are installed between adjacent girders, and a floor slab of reinforced concrete or the like that is supported by the beam structure. The beam structure can also be made of various structures such as steel, reinforced concrete, and steel reinforced concrete.

The roof structure 3 is composed of a roof beam structure that includes roof girders installed between adjacent columns 1 and roof beams installed between adjacent roof girders, and a roof slab and metal roof that are supported by the roof beam structure. The roof beam structure can also be made of various types of structures such as steel, reinforced concrete, and steel reinforced concrete.

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

Furthermore, in this building renovation method, by executing a collective floor height changing process on a portion of a height change area K1 in a planar view of an existing structure K, a step D (see Figure 5) that can be used for a truck berth, etc., can be formed in a single step across multiple floors between the floor structure part 2 of the height change area K1 in which the collective floor height changing process has been executed and the floor structure part 2 of the other non-height change area K2 in a planar view in which the collective floor height changing process has not been executed.

Below is an explanation of each step in the collective floor height change process (preparation step, cutting step, moving and fixing step).

(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., a hydraulic or other lifting jack J1 is installed at the lower end of a plurality of existing columns 1 (hereinafter, sometimes referred to as columns 11 to be cut) that connect the floor structure 2 of the plurality of floors to be changed in height (the third floor in the illustrated example) at the center side in a plan view. Furthermore, a temporary column 4 is provided to support the cut end 21 (see Fig. 3) on the outer periphery of the floor structure 2 of the plurality of floors to be changed in height across the plurality of floors, and a lifting jack J2 is also installed at the lower end of the temporary column 4.

As shown in Figures 2 and 6, the four lifting jacks J1 on the lower end of the column to be cut 11 are arranged to surround the column to be cut 11 in a 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 a position extending in a direction intersecting the left-right direction (front-to-back direction) in a plan view. Therefore, by operating and adjusting each of the four lifting jacks J1 in the moving and fixing process described below, the erection of the column to be cut 11 can be adjusted after the floor height is changed.

As shown in FIG. 2, a temporary support structure 5 is constructed to transmit the load of the roof structure 3 to the columns 1 on both outer sides (hereinafter, sometimes referred to as non-cut columns 12) so as not to cause deformation, etc., in the roof structure 3 that remains without changing its height above the floor structure 2 of the multiple floors whose height is to be changed in each subsequent process. 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 point of the column 11 to be cut, which is the part located below it, with a steel-frame temporary brace 51, and by connecting the parts directly above the cut points of adjacent columns 11 to be cut with steel-frame temporary cross members 52.

(Cutting process)
In the cutting process which is carried out following the preparation process, as shown in Figure 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.

Specifically, in this cutting process, the following cutting points (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 them to be reconnected.
At this time, at the first cutting location S1 on the lower end side of the column 11 to be cut, two locations 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 portion 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 parts 2 of the multiple floors to be changed in height are separated from the existing framework K so as to be freely lowered.

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. In addition, the cutting order of the second cutting points S2 on each floor can be, for example, from the lower floor to the upper floor, in which case the axial force introduced to the lifting jack J2 during cutting can be checked sequentially for each floor to be cut.

(Moving and fixing process)
In the moving and fixing process which is carried out following the cutting process, as shown in Figure 4, a lifting jack J1 installed at the lower end of the column 11 to be cut which connects the central side of the multi-floor floor structure section 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 section 21 of the multi-floor floor structure section 2 are both operated approximately simultaneously, and the multi-floor floor structure section 2 is lowered to the target height position while the entire multi-floor floor structure section 2 is supported by the lifting jacks J1 and J2.

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 structure K at the height after movement by welding or the like.
In addition, the cut ends of the first cutting point S1 on the lower end side of the column to be cut 11, 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 to be cut 11 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 connecting the floor structure parts 2 of the 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.

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

Furthermore, in this building renovation method, as shown in FIG. 7, the floor structure 2 of the multiple floors to be height-changed is divided into multiple divided blocks B each including a column 1 in plan view, and the collective floor height change process described above is carried out for each divided block B. In this embodiment, the multiple divided blocks B are divided into a central divided block Bc that is arranged toward the center of the building in plan view, and a pair of outer periphery divided blocks Bo that are arranged on the outer periphery of the building with the central divided block Bc sandwiched between them in plan view. Then, the collective floor height change process is carried out in the order of one outer periphery divided block Bo, the other outer periphery divided block Bo, and the central divided block Bc, while repurposing 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.

In this way, by performing the collective floor height changing process for each divided block B, the target range of the collective floor height changing process performed at one time can be reduced, and a significant decrease in the rigidity of the existing structure K during the collective floor height changing process can be suppressed. Furthermore, the difficulty of the work can be reduced to improve workability, and the amount of temporary materials and equipment such as the temporary columns 4, the temporary support structures 5, and the lifting jacks J1, J2 can be reduced.

[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.

(1) In the above-described embodiment, an example was shown in which, in the collective floor height change process, 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. However, the floor structure parts 2 of the multiple floors to be changed in height may also be raised and then re-fixed to the existing structure K at the height after raising.

(2) In the above embodiment, the building is divided into a plurality of divided blocks B each including a pillar 1 in a plan view.
Although an example has been given of a case in which the collective floor height change process is executed for each divided block B, depending on the size and structure of the multi-story floor structure portion 2 to be subjected to height changes, the collective floor height change process may be executed for the entirety without dividing it into divided blocks B.

Reference Signs List 1 Pillar 2 Floor structure 21 Cut end 3 Roof structure 4 Temporary pillar B Divided block D Step J1 Lifting jack J2 Lifting jack K Existing structure K1 Height change area K2 Non-height change area

Claims (4)

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 subjected 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. The building renovation method according to claim 1, in which the collective floor height change process is carried out sequentially while repurposing the equipment for each divided block. 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. The building renovation method according to claim 3, in which the collective floor height change process is carried out sequentially while repurposing the equipment including the temporary columns and the lifting jacks for each divided block.

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