JP6913469B2 - How to change the floor height of an existing building - Google Patents

Description

The present invention relates to a method for changing the floor height of an existing building in which an existing floor structure portion is erected on a plurality of existing columns.

When the existing building is used for another purpose, it may be preferable to change the floor height according to the purpose. In Patent Document 1, an existing floor structure erected on a plurality of existing columns is cut and separated from an existing building, moved in the height direction using a hydraulic jack or the like, and then re-fixed to the existing building. A method for changing the floor height of a building has been proposed. In this floor height changing method, the floor height of the existing building can be changed by reusing the existing floor structure portion of the existing building.

JP-A-2015-063793

In the above-mentioned conventional floor height changing method, the work of cutting and separating the existing floor structure from the existing building while appropriately supporting the existing floor structure with a hydraulic jack or the like, and appropriately supporting the cut and separated existing floor structure with a hydraulic jack or the like. However, it is necessary to move the floor structure in the height direction and to appropriately fix the existing floor structure whose height has been changed to the existing building. However, since the weight of the existing floor structure is rather large, the difficulty of each of these operations becomes extremely high. Therefore, there is an inconvenience that it is difficult to change the floor height of the existing building accurately and safely.

In view of this situation, the main problem of the present invention is that the difficulty level of each work is low, the floor height can be changed accurately and safely, and the floor structure portion after the height change is added as an added value. The point is to provide a method for changing the floor height of an existing building that can increase the allowable load and improve the earthquake resistance.

The first characteristic configuration of the present invention is a method of changing the floor height of an existing building in which an existing floor structure portion is erected on a plurality of existing columns.
The new floor structure is superposed on the existing floor structure to raise the floor, and the existing floor structure and the new floor structure are integrally joined so as to be able to transmit stress to form an integral floor structure. Bei to give a floor raised integrated step of,
The existing floor structure portion includes an existing beam structure having an existing beam and an existing floor structure supported by the existing beam structure.
The new floor structure portion includes a new beam structure having a new beam.
In the floor raising integration step, an opening is formed in the existing floor structure, and the existing beam structure and the new beam structure are joined through the opening .

According to this configuration, in the floor raising integration process, the new floor structure is superposed on the existing floor structure to raise the floor, so that the heavy existing floor structure is appropriately supported by a hydraulic jack or the like. However, there is no difficult work to be performed, and the floor height can be changed accurately and safely.
Moreover, in this floor raising integration process, the existing floor structure and the new floor structure are integrally joined so that stress can be transmitted to form an integrated floor structure, so that the floor is erected on a plurality of existing columns. The strength of the structural part can be increased, and as an added value, the allowable load of the floor structural part can be increased and the earthquake resistance can be improved.

Further, according to this configuration, by joining the existing beam structure of the existing floor structure part and the new beam structure of the new floor structure part, the existing floor is reinforced by the new beam structure. The structural part and the new floor structure part can be properly integrated.
Moreover, since the joining work between the existing beam structure and the new beam structure is performed by forming an opening in the existing floor structure, the work is significantly larger than that performed by removing most of the existing floor structure. Labor saving can be achieved. Further, the existing floor structure can be utilized for the work floor, and the work efficiency and safety can be improved.

The second characteristic configuration of the present invention is a method of changing the floor height of an existing building in which an existing floor structure portion is erected on a plurality of existing columns.
The new floor structure is superposed on the existing floor structure to raise the floor, and the existing floor structure and the new floor structure are integrally joined so as to be able to transmit stress to form an integral floor structure. Equipped with a floor raising integration process
The existing beam structure and the new beam structure are configured to include a beam having a diagonal member.
In the floor raising integration step, the diagonal member of the new beam structure is constructed in a state of extending the diagonal member of the existing beam structure.

According to this configuration, in the floor raising integration process, the new floor structure is superposed on the existing floor structure to raise the floor, so that the heavy existing floor structure is appropriately supported by a hydraulic jack or the like. However, there is no difficult work to be performed, and the floor height can be changed accurately and safely.
Moreover, in this floor raising integration process, the existing floor structure and the new floor structure are integrally joined so that stress can be transmitted to form an integrated floor structure, so that the floor is erected on a plurality of existing columns. The strength of the structural part can be increased, and as an added value, the allowable load of the floor structural part can be increased and the earthquake resistance can be improved.
Further, according to this configuration, when both the existing beam structure and the new beam structure include a beam having a diagonal member (for example, a truss beam), the diagonal member of the existing beam structure and the new beam structure It is possible to more appropriately transfer stress to and from the diagonal member, and it is possible to more appropriately integrate the existing floor structure portion with the newly constructed floor structure portion.
The third characteristic configuration of the present invention is that the new floor structure portion is joined to the existing pillar in the floor raising integration step.
According to this configuration, the shear strength of the joint portion of the integrated floor structure erected on a plurality of existing columns can be improved by joining the new floor structure to the existing columns. For example, the span of the columns can be increased. When it is short, it is possible to appropriately increase the allowable load of the floor structure. In addition, more stress can be transmitted from the integrated floor structure to the existing columns, and appropriate measures can be taken, for example, when measures for short-term loads rather than long-term loads are required.

Diagram showing the existing building before changing the floor height The figure which shows the floor raising integration process The figure which shows the floor raising integration process Diagram showing the existing building after changing the floor height The figure which shows the existing building after changing the floor height of another embodiment

An embodiment of a method for changing the floor height of an existing building according to the present invention will be described with reference to the drawings.
FIG. 1 shows a part of the existing building T before the floor height is changed. As shown in FIG. 1, the existing building T has a structure in which the existing floor structure portion 20 is erected between a plurality of existing pillars 10.

The existing columns 10 include various types such as steel frame (S structure), reinforced concrete structure (RC structure), steel frame reinforced concrete structure (SRC structure), filled steel pipe concrete structure (CFT structure) in which steel pipes are filled with concrete, and their composite structures. The structure can be adopted as appropriate. In the present embodiment, the existing pillar 10 is made of CFT structure.

As the existing floor structure portion 20, various structures such as S structure, RC structure, SRC structure, and a composite structure thereof can be appropriately used. In the present embodiment, the existing floor structure portion 20 is the existing beam structure 21 having the existing beam 21A whose both ends are joined to the outer peripheral surfaces of the plurality of existing columns 10 by joining means A such as bolts and welding. , The existing beam structure 21 is provided with an existing floor structure 22 supported from below.

The existing beam 21A is configured as, for example, a steel truss beam in which a plurality of diagonal members 21d are assembled between the upper chord member 21a and the lower chord member 21b, and the existing floor structure 22 is composed of, for example, concrete. ing. Although not shown, the small beams can be appropriately extended between the existing beams 21A that are parallel to each other at intervals in the depth direction in FIG.

Then, in the floor height changing method according to the present invention, as shown in FIGS. 2 to 4, the new floor structure portion 30 is superposed on the existing floor structure portion 20 to raise the floor, and the existing floor structure portion 20 is raised. As shown in FIG. 4, by executing the floor raising integration step of integrally joining the new floor structure portion 30 and the newly installed floor structure portion 30 at the floor joint portion 40 so as to be able to transmit stress integrally to form the integrated floor structure portion 50, as shown in FIG. The floor height of the existing building T is changed from the existing height H1 to the new height H2. This floor height changing method is suitably used to change the floor height according to the changed usage, for example, when changing the usage of the entire existing building T or a part thereof. Can be done.

In the present embodiment, the new floor structure portion 30 is configured to include a new beam structure 31 having a new beam 31A and a new floor structure 32 supported by the new beam structure 31 from below. As an example, the new floor structure portion 30 can appropriately use various structures such as S structure, RC structure, SRC structure, and a composite structure thereof, as in the case of the existing floor structure portion 20. ..
Here, the new beam 31A is made of a steel beam made of a shaped steel such as H-shaped steel, and the new floor structure 32 is made of, for example, concrete. Further, although not shown, the small beams can be appropriately extended between the newly installed beams 31A which are parallel to each other at intervals in the depth direction in FIG.

Hereinafter, the floor raising integration process will be described.
In this floor raising integration step, each work is performed by utilizing the existing floor structure 22 as a work floor without removing the existing floor structure 22.

First, as shown in FIG. 2, hole-shaped openings H such as a circle or a quadrangle for constructing the floor joint 40 are formed at a plurality of locations directly above the existing beam 21A in the existing floor structure 22. The formation location of the opening H is set, for example, at a location directly above the joint portion between the upper chord member 21a and the diagonal member 21d of the existing beam 21A in the existing floor structure 22.

Then, a steel-framed connecting member 41 constituting the floor joint 40 is arranged in a vertical posture in each opening H of the existing floor structure 22, and the lower end of the connecting member 41 and the upper end of the existing beam 21A are arranged. Join by appropriate joining means (not shown) such as bolts and welding.

Next, as shown in FIG. 3, a new beam 31A of the new beam structure 31 is arranged at a portion directly above the existing beam 21A in the existing floor structure 22, and the lower end of the new beam 31A and the upper end of the connecting member 41 are connected to each other. Join by appropriate joining means (not shown) such as bolts and welding.
In this way, the existing beam structure 21 and the new beam structure 31 are joined via the connecting member 41 constituting the floor joining portion 40, and the new floor structure portion 30 is joined to the plurality of existing columns 10.

Further, if necessary, both ends of the new beam 31A are joined to the outer peripheral surfaces of the existing columns 10 by appropriate joining means B such as bolts and welding. As the joint structure between the new beam 31A and the existing column 10, various joint structures such as rigid joints and semi-rigid joints can be appropriately selected.

Then, as shown in FIG. 4, the new floor structure 32 is constructed on the new beam structure 31 to complete the new floor structure 30, and the existing floor structure 20 and the new floor structure 30 are integrated. The floor structure portion 50 is integrated so that stress can be transmitted to the floor, and the floor height of the existing building T is changed from the existing height H1 to the new height H2.

In this way, in this floor height changing method, the floor is raised by superimposing the new floor structure portion 30 on the existing floor structure portion 20, so that the existing floor structure portion 20 having a large weight can be appropriately used with a hydraulic jack or the like. There is no difficult work to be done while supporting it, and the floor height can be changed accurately and safely.
Moreover, since the existing floor structure portion 20 and the new floor structure portion 30 are integrally joined so as to be able to transmit stress to form an integrated floor structure portion 50, the strength of the floor structure portion 50 can be increased, which is an added value. It is possible to increase the allowable load of the floor structure portion 50 and improve the earthquake resistance.

[Another Embodiment]
(1) In the above-described embodiment, the case where the existing beam 21A of the existing beam structure 21 and the new beam 31A of the new beam structure 31 are joined via the connecting member 41 in the vertical posture is shown. As shown in 5, when the new beam 31A has the upper chord member 31a and the diagonal member 31d, the diagonal member 31d of the new beam 31A is extended upward through the opening H. It may be constructed and the existing beam 21A of the existing beam structure 21 and the new beam 31A of the new beam structure 31 may be joined. In addition, in the figure, the same number is added to the same configuration part as the above-mentioned first embodiment.

In this case, for example, by joining the slanted lumber 21d of the existing beam 21A and the slanted lumber 31d of the new beam 31A in a coaxially aligned state, the slanted lumber 21d of the existing beam 21A is extended upward. The diagonal member 31d of the new beam 31A can be constructed.

In this way, stress transfer between the slanted lumber 21d on the existing beam structure 21 side and the slanted lumber 31d on the new beam structure 31 side can be performed more appropriately, and the existing floor structure portion 20 and the existing floor structure portion 20 can be subjected to stress transmission. The integration with the new floor structure portion 30 can be realized more appropriately.

In the illustrated example, the case where all the diagonal members 21d of the existing beam 21A and all the diagonal members 31d of the new beam 31A are joined is shown as an example, but a part of the diagonal members 21d of the existing beam 21A and the new beam A part of the diagonal member 31d of 31A may be joined, and in some cases, the upper chord member 21a of the existing beam 21A may be removed. The new beam 31A is not limited to the one composed of only the upper chord member 31a and the diagonal member 31d, and may further have a lower chord member.

(2) In the above-described embodiment, the opening H formed in the existing floor structure 22 is formed into a hole shape such as a circle or a quadrangle, and a vertical connecting member 41 is arranged in the opening H to form one existing beam. The case where the 21A and one new beam 31A are joined is shown as an example. For example, the opening H is formed into a slit shape extending over a plurality of existing beams 21A arranged side by side, and a long laterally oriented connecting member. May be arranged so as to extend over the plurality of existing beams 21A to join the plurality of existing beams 21A and the plurality of newly installed beams 31A.

(3) In the above-described embodiment, the case where the existing floor structure portion 20 is composed of the existing beam structure 21 and the existing floor structure 22 is shown as an example, but the existing floor as in the so-called flat slab structure. It may be composed of only the structure 22.
Similarly, the new floor structure portion 30 is not limited to the one composed of the new beam structure 31 and the new floor structure 32, and may be composed of only the new floor structure 32.

(4) In the above-described embodiment, the case where the new floor structure 32 is made of concrete is shown as an example, but it may be made of another material such as metal.

(5) The floor height changing method according to the present invention is not limited to changing the use of the entire existing building T or a part thereof, and can be suitably used in various situations where the floor height needs to be changed. can.

10 Existing columns 20 Existing floor structure 21 Existing beam structure 21d Slanted material 22 Existing floor structure 30 New floor structure 31 New beam structure 31d Slanted material 32 New floor structure 50 Floor structure T Existing building

Claims (3)

This is a method of changing the floor height of an existing building in which the existing floor structure is erected on multiple existing columns.
The new floor structure is superposed on the existing floor structure to raise the floor, and the existing floor structure and the new floor structure are integrally joined so as to be able to transmit stress to form an integral floor structure. Bei to give a floor raised integrated step of,
The existing floor structure portion includes an existing beam structure having an existing beam and an existing floor structure supported by the existing beam structure.
The new floor structure portion includes a new beam structure having a new beam.
A method for changing the floor height of an existing building in which an opening is formed in the existing floor structure and the existing beam structure and the new beam structure are joined through the opening in the floor raising integration step. This is a method of changing the floor height of an existing building in which the existing floor structure is erected on multiple existing columns.
The new floor structure is superposed on the existing floor structure to raise the floor, and the existing floor structure and the new floor structure are integrally joined so as to be able to transmit stress to form an integral floor structure. Equipped with a floor raising integration process
The existing beam structure and the new beam structure are configured to include a beam having a diagonal member.
Wherein the floor raising the integration step, the existing beam structure the diagonal member the new beam structure floor height changing existing building to build a diagonal member in the state of extending the. The method for changing the floor height of an existing building according to claim 1 or 2 , wherein the new floor structure portion is joined to the existing pillar in the floor raising integration step.

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