JP4648154B2 - Extension method of building and extension building - Google Patents

Description

  The present invention relates to an extension method for a building and an extension building, and more particularly, in an extension method for extending an existing building upward, an extension having sufficient strength can be constructed by a wooden frame structure. The present invention relates to a possible extension method and a building obtained by this method.

Conventionally, for example, when trying to expand a two-story house, if there is room in the site, it can be expanded using an available site, but if there is no room in the site, it can be expanded. There wasn't.
However, due to recent revisions to the Building Standards Act and deregulation, etc., the construction of three-story buildings is now allowed even in areas where only two-story buildings are conventionally approved. As a result, even if there is no room on the site, a two-story building can be expanded to a three-story building.

  However, in the past, for example, in order to make a two-story building into a three-story building, it is possible to construct a new three-story part above the second floor because of the strength of the pillars, walls, beams, etc. First of all, there was no other way but to remove all the existing two-story buildings and build a three-story building on the site, but such a conventional method is not only uneconomical, Industrial waste increased, and residents were forced to move until new buildings were completed.

Therefore, in view of such circumstances, one of the inventors of the present application makes use of an existing building, and a building method and a building that can be expanded as it is in the vertical direction without a resident moving temporarily. The thing is proposed (refer patent document 1).
The invention described in Patent Document 1 is based on a novel idea of constructing a new building above an existing building by providing a new foundation and pillar so as to surround the existing building. It is a very novel and excellent solution that can solve many of the problems associated with conventional extension methods.

In the technique disclosed in Patent Document 1, a steel column is used as a new column for extension.
This is because, for example, when the existing building is two stories and the extension building is three stories, the wooden pillar does not have strength.
However, the wooden frame structure, which is a traditional Japanese residential structure, has various advantages over the steel structure, and is more advantageous than the steel structure in terms of construction cost.
Therefore, the inventor of the present application has continued earnestly researching a method capable of overcoming the strength problem by incorporating a wooden frame structure into the invention described in Patent Document 1, and has completed the present invention.

JP 2000-282696 A

  The present invention has been made in view of the above circumstances, and in an extension method for extending an existing building upward, it is possible to construct an extension having sufficient strength even with a wooden frame structure. We intend to provide an extension method and a building obtained by this method.

  The invention according to claim 1 is characterized in that an extension foundation is provided outside the foundation of the existing building, and a plurality of extension pillars extending above the existing building are erected above the extension foundation. A building extension method for forming a new living space above an existing building by constructing a floor and a roof by laying a beam between the extension columns above the building. The column is composed of a lower column erected on the foundation for extension and an upper column erected above the lower column, and the lower column is erected with a gap parallel to each other A plurality of pillars made of a material, the end of the beam is sandwiched and fixed in the gap between the plurality of pillars, the upper pillar is erected on the upper surface of the beam, and the lower end of the upper pillar is the gap The present invention relates to a method for extending a building, characterized by sandwiching and fixing.

  The invention according to claim 2 is characterized in that, in the lower column of the plurality of extension columns, the end of the beam protrudes from the outer surface of the lower column, and the end of the trunk is joined to the protrusion. The method of extending a building according to claim 1.

  The invention according to claim 3 is characterized in that a connecting member for connecting the pillars is interposed between the plurality of pillars constituting the lower pillar. About.

  According to a fourth aspect of the present invention, a base plate is fixed to the upper surface of the extension foundation, a square steel pipe is erected and fixed to the upper surface of the base plate, and the square steel pipe is sandwiched by a plurality of columns constituting the lower column, 4. The building extension method according to claim 1, wherein the pillar and the square steel pipe are joined to each other.

  In the invention according to claim 5, an extension foundation is provided outside the foundation of the existing building, and a plurality of extension pillars extending above the existing building are erected above the extension foundation, A building in which a new living space is formed above an existing building by constructing a floor and a roof by building a beam between the extension columns above the existing building, and the extension A structure in which a pillar is composed of a lower pillar standing on the extension foundation and an upper pillar standing above the lower pillar, and the lower pillars are erected in parallel with a gap therebetween It consists of a plurality of columns made of a material, and the end of the beam is sandwiched and fixed in the gap between the plurality of columns, the upper column is erected on the upper surface of the beam, and the lower end of the upper column is the gap It is related with the building characterized by being pinched and fixed to.

  According to a sixth aspect of the present invention, in the lower column of the plurality of extension columns, the end of the beam protrudes from the outer surface of the lower column, and the end of the trunk is joined to the protruding portion. It is related with the building of Claim 5 characterized by the above-mentioned.

  The invention according to claim 7 relates to the building according to claim 5 or 6, wherein a connecting member for connecting the columns is interposed between the plurality of columns constituting the lower column. .

  In the invention according to claim 8, a base plate is fixed to the upper surface of the extension base, a square steel pipe is erected and fixed to the upper surface of the base plate, and the square steel pipe is sandwiched by a plurality of columns constituting the lower column, The building according to any one of claims 5 to 7, wherein these columns and the square steel pipe are joined.

According to the invention which concerns on Claim 1 and 5, each pillar of the extension was made into the multiple pillar which consists of a laminated material standing in parallel mutually with the clearance gap, Therefore The pillar made from normal natural wood Compared to the above, it is possible to greatly improve the strength of the extension columns, and furthermore, the end of the beam is sandwiched and fixed in the gap between the multiple columns, so that the multiple columns can be The strength of the extension column is reinforced by the beam. In addition, the extension column consists of an upper column and a lower column, the upper column is erected on the upper surface of the beam, and the lower end of the upper column is sandwiched and fixed in the gap between the lower columns, thereby maintaining the strength of the extension column. However, it can extend greatly upward.
Therefore, the existing building can be reborn into an extension that is extended upward and has sufficient strength while using the wooden frame structure.

  According to the invention which concerns on Claim 2 and 6, in the lower column of a plurality of extension pillars, the edge part of a beam protrudes from the outer surface of a lower pillar, and the edge part of a trunk is joined to this protrusion part Further, it is possible to obtain a structure in which the extension pillar, the beam, and the torso are firmly integrated, and the strength of the extension can be increased.

  According to the invention which concerns on Claim 3 and 7, the seat of the lower pillar which comprises a pillar for extension by interposing the connection member which connects between pillars between the several pillars which comprise a lower pillar It is possible to reliably prevent bending.

  According to the inventions according to claims 4 and 8, the base plate is fixed to the upper surface of the extension foundation, the square steel pipe is erected and fixed to the upper surface of the base plate, and the square steel pipe is sandwiched between the plurality of columns constituting the extension column. Since these columns and the square steel pipe are joined, the extension columns are reinforced by the square steel pipe and firmly integrated with the foundation, so that an extension having a stable high strength can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a building extension method and an extension building according to the present invention will be described with reference to the drawings.
First, the basic configuration of the present invention will be described.
1 to 4 are front views schematically showing an extension method according to the present invention, which are shown in the order of construction steps from FIG. 1 to FIG. In these figures, only the framework of the building is shown.

FIG. 1 is a diagram showing a state before the construction of the extension method according to the present invention, and shows an existing wooden structure composed of a two-story house. However, the present invention can also be applied to a case where the existing building has one floor or three floors or more. In addition, the type of the existing building is not limited to a wooden structure, and may be another type of building such as a lightweight steel structure.
In the method according to the present invention, first, as shown in FIG. 2, the extension foundation (3) for supporting the extension part at a position near the outside of the existing foundation (2) supporting the pillar of the existing building (1) is provided. Provide.

  The boundary (see the circle in FIG. 5) between the existing foundation (2) and the extension foundation (3) may be structurally separated and connected by an expansion joint as shown in FIG. 5 (a). Alternatively, they may be structurally integrated as shown in FIG. As a method of integration, for example, the concrete of the existing foundation (2) is exposed to expose the reinforcing bars, then the exposed reinforcing bars are connected to the reinforcing bars for the extension foundation (3), and finally the existing foundation exposed. A method of covering the reinforcing bars of (2) and the reinforcing bars of the extension foundation together with concrete can be exemplified.

Next, an extension pillar (4) having a height extending above the existing building (1) is erected on the upper part of the extension foundation (3) (see FIG. 3).
As shown in FIGS. 6A and 6B, the extension pillar (4) is erected so as to surround the periphery of the existing building (1). The interval between adjacent extension pillars (4) can be set by structural calculation.

Next, the roof (5) and the beam (6) are constructed above the existing building (1) by using the extension pillar (4) standing so as to surround the existing building (1). .
At this time, the roof (shed and tile) of the existing building (1) may be removed, and a beam (6) may be installed on the removed portion of the existing roof (see FIG. 3), or the existing building (1) The beam (6) can be installed above the existing roof without removing the roof (see FIG. 7).

  When the roof of the existing building (1) is removed, the load on the existing building (1) is reduced, and the earthquake resistance of the existing building (1) portion can be improved. By removing the roof of the existing building after the construction of the new roof (5), residents in the existing building can continue to live during the construction.

  Subsequently, a new floor is provided above the beam (6), and a new wall is provided outside the extension pillar (4) so as to surround the existing building (1). The extension building in which a new living space (7) is formed above is completed (see FIG. 4). In the example shown in FIG. 4, the new living space (7) is a living space on the third floor.

It is preferable to interpose a cushioning material (8) between the pillar of the existing building (1) and the extension pillar (4).
The number and position of the cushioning material (8) are not particularly limited, but it is preferably provided at least on the floor and ceiling of the existing building (1) and on the beam portion located at the boundary of each floor, as shown.
As the buffer material (8), synthetic rubber or elastite is preferably used, but is not particularly limited thereto.

  Thus, by interposing the cushioning material (8) between the structural material of the existing building (1) and the structural material of the extension part, the collision between the existing building (1) and the extension part in the event of an earthquake. Can be prevented, and vibrations can be absorbed and relaxed to suppress shaking of the entire building.

  In this invention, it replaces with the structure which interposes a shock absorbing material (8) between the pillar of an existing building (1), and the pillar for extension (4), and is the existing building (1 in the part of a shock absorbing material (8). ) And the extension column (4) can be rigidly joined.

The above is the basic configuration of the present invention. Next, the characteristic configuration of the present invention employed in addition to the above basic configuration will be described.
FIG. 8 is a perspective view showing an extracted portion of the characteristic configuration of the present invention.
In the present invention, the extension pillar (4) described above is composed of a lower pillar (41) standing on the extension foundation (3) and an upper pillar (42) standing above the lower pillar. The

Each of the lower pillars (41) is composed of a plurality of pillars (hereinafter referred to as small pillars) standing in parallel with a gap therebetween.
Normally, there are two small pillars as shown in the figure, but three or more can be juxtaposed in order to further increase the strength of the extension pillar (4).

The gap between the small pillars is set to be substantially equal to the planar view width of the beam (6), and the small pillars are located near the upper end of the lower pillar (41) located above the existing building (1). The beam (6) is clamped and fixed in the gap. When there are three or more small pillars, there are two or more gaps between the small pillars. Therefore, the beam (6) may be sandwiched between the gaps.
By adopting such a structure, a plurality of small columns are joined through the beam (6), and the strength of the lower column (41) constituting the extension column (4) is increased by the beam (6). Reinforced.
The small column (the lower column (41)) and the beam (6) can be fixed using a known joining means such as a nail or a hardware.

In the lower pillar (41) of the plurality of extension pillars (4) erected so as to surround the existing building (1), the end of the beam (6) is from the outer surface of the lower pillar (41) Protruding.
This projecting length is set to be approximately equal to the planar width of the body insert (9), and the end of the body insert (9) is joined to this projecting portion, so that the adjacent extension columns (4) are connected to each other. It is connected by a torso (9).

The lower column (41) is disposed above the joint between the extension column (4) and the beam (6), more specifically, on the upper surface of the beam (6) in the gap between the small columns constituting the lower column (41). An upper column (42) extending upward is provided.
The lower end portion of the upper column (42) is sandwiched and fixed in the gaps between the small columns constituting the individual lower columns (41).
The upper column (42) and the lower column (41) can be fixed using known joining means such as bolts, nails, and hardware.

As described above, by joining the upper column (42) above the lower column (41), the upper column (42) can be erected in a stable state above the lower column (41).
As a result, the extension pillar (4) can be extended to a height that is difficult to obtain with the lower pillar (41) alone, and a high extension can be obtained.

In this invention, a laminated material is used for the extension pillar (4) and the beam (6).
Glulam has a structure that is laminated and integrated after removing defects such as knots and cracks from artificially dried ground boards, etc., so the quality is uniform and it can exhibit higher strength than natural wood. it can.

In this invention, it becomes possible to improve the intensity | strength of the extension pillar (4) significantly by using a laminated material as an extension pillar (4) and a beam (6), and combining these by the above-mentioned structure. Thereby, it becomes possible to reinvent an existing building into an extension that is extended upward with sufficient strength using a wooden frame structure without using a steel frame or the like as a structural material.
Of the extension pillars (4), the upper pillar (41) can be made of ordinary natural wood instead of laminated wood if the length is short.

The height of the lower column (41) and the upper column (42) constituting the extension column (4) is substantially equal to the height of the building after extension (hereinafter referred to as an extension building) as a whole.
The lower pillar (41) has a height that extends at least above the existing construction (1), and the remaining height is supplemented by the upper pillar (42). At this time, it is preferable that the lower column (41) is longer than the upper column (42).
For example, if the existing building is one-story or two-story and the extension building is three-story, the lower pillar (41) is slightly higher than the height of the second floor, and the upper pillar (42) The height of the remaining first floor can be compensated.

A connecting member (10) for connecting the small columns is interposed between the plurality of small columns constituting the lower column (41).
This connecting member (10) is made of a rectangular parallelepiped-shaped piece of wood, is arranged so as to fill the gap between the small columns, and is joined to the small columns on both sides by bolts, nails, hardware or the like.
The connecting member (10) is provided to prevent buckling of the extension column (4), and is interposed in a part of the lower column (41) in the length direction as shown in the figure. The number is not limited to one as in the illustrated example, and the number can be increased according to the length (height) of the lower column (41).

The extension foundation (3) is a cloth foundation in the illustrated example, but may be an independent foundation. Moreover, although it is preferable to set it as a reinforced concrete structure, a concrete structure may be sufficient.
In the present invention, a base plate type fixing method of a ramen structure is used as shown in FIG. 9 without installing a wooden base on a foundation as in a normal wooden building.

A metal base plate (11) is fixed on the upper surface of the extension foundation (3), and a short square steel pipe (12) is fixed upright on the upper surface of the base plate (11).
The square steel pipe (12) is sandwiched between a plurality of small pillars constituting the lower pillar (41), and the small pillar and the square steel pipe (12) are fastened and fixed by bolts.
The square steel pipe (12) plays a role as a reinforcing material that reinforces the strength of the lower column (41) and a shock absorbing material that buffers vibration caused by an earthquake or the like.
Furthermore, the outer side surface of the small pillar which comprises a lower pillar (41) is joined to the foundation for extension (3) using an angle material (13).

  By fixing the extension pillar (4) to the extension foundation (3) in this way, the extension pillar (3) is reinforced by the square steel pipe (13), and the extension foundation (3) and Since the extension pillar (4) is firmly integrated, a stable extension having high strength can be obtained.

  The present invention is used for extending a building upward using a wooden frame structure.

It is a front view which shows roughly the 1st process of the extension method which concerns on this invention. It is a front view which shows roughly the 2nd process of the extension method which concerns on this invention. It is a front view which shows roughly the 3rd process of the extension method which concerns on this invention. It is a front view which shows roughly the 4th process of the extension method which concerns on this invention. It is sectional drawing which shows the structure of the existing foundation and the foundation for extension. It is a schematic plan view which shows an example of the standing position of the pillar for extension. It is a schematic front view which shows the example of a change of the extension method which concerns on this invention, Comprising: It is a figure which shows the example maintained as it is, without removing the roof of an existing building. It is a perspective view which extracts and shows the part of the characteristic composition of the extension building concerning the present invention. It is a figure which shows the junction part of the foundation for extension of the extension building which concerns on this invention, and the pillar for extension.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 Existing foundation 3 Extension foundation 4 Extension pillar 41 Lower pillar 42 Upper pillar 5 New roof 6 Beam 7 New living space 9 Trunk 10 Connection member 11 Base plate 12 Rectangular steel pipe

Claims (8)

  An extension foundation is provided outside the foundation of the existing building, and a plurality of extension pillars are provided above the extension foundation so as to extend above the existing building, and the extension building is disposed above the existing building. A building extension method in which a new living space is formed above an existing building by constructing a floor and a roof by laying beams between columns, wherein the extension column is placed on the extension foundation. The lower column is composed of a lower column and an upper column that is disposed above the lower column, and the lower column is a plurality of columns made of laminated material that is erected with a gap in parallel to each other. The end of the beam is clamped and fixed in the gap between the plurality of columns, the upper column is erected on the upper surface of the beam, and the lower end of the upper column is clamped and fixed in the gap. How to add buildings.   2. The building according to claim 1, wherein, in a lower column of the plurality of extension columns, an end portion of the beam is protruded from an outer surface of the lower column, and an end portion of a trunk is joined to the protruding portion. How to add things.   The building extension method according to claim 1 or 2, wherein a connecting member for connecting the columns is interposed between the plurality of columns constituting the lower column.   A base plate is fixed to the upper surface of the extension base, a square steel pipe is erected and fixed to the upper surface of the base plate, and the square steel pipe is sandwiched by a plurality of columns constituting the lower column, and these columns and the square steel tube are The building extension method according to any one of claims 1 to 3, wherein the building is joined.   An extension foundation is provided outside the foundation of the existing building, and a plurality of extension pillars are provided above the extension foundation so as to extend above the existing building, and the extension is provided above the existing building. A building in which a new living space is formed above an existing building by constructing a floor and a roof by laying a beam between the building columns, wherein the extension column is the foundation for extension It is composed of a lower column that is erected above and an upper column that is erected above the lower column, and the lower column is composed of a plurality of columns made of laminated material that is erected with a gap in parallel with each other The end of the beam is clamped and fixed in the gap between the plurality of columns, the upper column is erected on the upper surface of the beam, and the lower end of the upper column is clamped and fixed in the gap. Characteristic building.   6. The lower column of the plurality of extension columns, wherein an end portion of the beam protrudes from an outer surface of the lower column, and an end portion of a trunk is joined to the protruding portion. Building.   The building according to claim 5 or 6, wherein a connecting member for connecting the columns is interposed between the plurality of columns constituting the lower column. A base plate is fixed to the upper surface of the extension base, a square steel pipe is erected and fixed to the upper surface of the base plate, and the square steel pipe is sandwiched by a plurality of columns constituting the lower column, and these columns and the square steel tube are The building according to any one of claims 5 to 7, wherein the building is joined.

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