JPH09235782A - Inner balcony provided with truss unit as upper structure and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balcony which can be easily constructed and reduce man-hours in the execution at the construction site and easily form a sufficient large opening between the upper structure and the balcony. SOLUTION: This inner balcony 10 is provided with a truss unit 16 as an upper structure and also provided with a lower structure 84 arranged at the lower part of the truss unit to support the truss unit 16. The truss unit 16 is provided with an outer truss 20 composed of diagonal members 24 and bottom members 28, an inner truss 52 composed of diagonal members 58 and bottom members 64, and members 70, 74 connecting the outer truss 20 and the inner truss 52. The lower structure 84 is provided with the front part supporting the outer truss 20 by columns 94 and the rear part supporting the inner truss 52 by at least wall panels 114.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner balcony using a truss unit as an upper structure and a method for constructing and constructing the same.

[0002]

[Related Art and Problems to be Solved by the Invention]
The inner balcony is constructed by on-site construction including the construction of its upper structure, and since its structure is different from other parts of the house in many cases, there is the problem that it requires a lot of man-hours for construction. there were.

Further, in the wall type construction method, since it is necessary to secure a bearing wall, there is a problem that a sufficient opening size cannot be secured in an inner balcony where a large opening is expected.

The present invention has been made in order to solve the above problems, and an object thereof is to provide an inner balcony which is easy to construct and can reduce the number of on-site construction steps, and a construction method thereof. To provide.

Another object of the present invention is to provide an inner balcony in which a sufficiently large opening can be easily formed between the inner balcony and the upper structure.

[0006]

[Means for Solving the Problems] In this section,
Means for achieving the above object will be described by associating reference numerals of the embodiments of the present application with respective constituent elements of the claims of the present application.

The inner balcony 10 according to the invention described in claim 1 is an inner balcony having a truss unit 16 as an upper structure, and the truss unit 16 which is the upper structure of the inner balcony 10 and the lower part of the truss unit. And a lower structure 84 for supporting the truss unit.
An outer truss 20 having 8 and a hypotenuse 58 and a base 64
An inner truss 52 having an outer truss and connecting members 70 and 74 for connecting between the outer truss and the inner truss, and the lower structure includes a front portion that supports the outer truss with a pillar 94, and at least a front portion. A rear portion that supports the inner truss with a wall panel 114.

According to the first aspect of the invention, the inner balcony is constituted by the truss unit including the outer truss, the inner truss, and the connecting member, and the lower structure for supporting the truss unit by the pillars and the wall panels. It Therefore, the inner balcony can be obtained by disposing and fixing the prefabricated truss unit on the lower structure, and the man-hours for on-site construction can be reduced.
Further, since the pillar is used for the lower structure, the opening can be easily formed between the upper truss unit and the upper truss unit. Furthermore, since a wall panel is also appropriately used in the rear part of the lower structure, it is possible to secure a bearing wall line for the entire house.

According to a second aspect of the present invention, in the inner balcony according to the first aspect of the present invention, the bottom portion of the outer truss is provided with a horizontal member 38 which is arranged at a predetermined interval, and a vertical member which is arranged at a distance. The material 40 defines an invention of an inner balcony characterized in that the outer shape as a whole is formed into a square shape, and that the assembly beam 36 has a length that extends over the entire width of the bottom portion.

According to the second aspect of the present invention, the outer truss has a square outer shape as a whole, because the outer truss has a bottom portion formed of horizontal members which are spaced apart from each other by a predetermined distance and vertical members which are spaced apart from each other. It has an assembly beam formed in a shape at its upper part or lower part. Therefore, the thickness of the bottom portion in the height direction can be increased without significantly increasing the weight of the entire bottom portion, and it is possible to form a wall surface that is preferable in design.
Further, it is possible to secure a sufficient thickness in the height direction for attaching the sash frame or the like.

According to a third aspect of the present invention, in the inner balcony according to the second aspect of the invention, a vertical member 40 penetrating from the upper surface to the lower surface of the assembled beam is provided at a portion where the pillar of the lower structure is located immediately below the assembled beam. The invention defines an inner balcony invention characterized by having

According to the invention of claim 3, in the assembled beam forming a part of the bottom portion of the outer truss, a vertical member penetrating from the upper surface to the lower surface is used in the portion where the pillar is located immediately below. .
Therefore, this assembled beam can be transmitted to other parts of the truss unit without dispersing the supporting force from the column. In addition, the supporting force from the pillar can be sufficiently endured.

According to a fourth aspect of the present invention, in the inner balcony according to any one of the first to third aspects of the invention, the pillar of the lower structure has a shape in which a square pillar is vertically divided into two.
The invention defines an inner balcony characterized in that it is formed by pasting together square pieces 96 of a book and sandwiches the fixing portion 104 of the battledore bolt 102.

According to the invention of claim 4, the fixing portion of the battledore bolt can be hidden inside the pillar, and the bolt portion of the battledore bolt can be projected from the center of the pillar of the lower structure. Therefore, since the fixing part of the battledore bolt is not exposed on the side surface of the pillar, not only the pillar becomes aesthetically excellent, but also the bolt part can be attached to the pillar with sufficient mounting strength via the fixing portion. it can. Also, when the bolt part is passed through the bottom part of the truss unit and tightened with nuts etc., the binding force is applied directly above the column, and an unnecessary shear force component is generated on the bottom part of the truss unit. Never.

According to a fifth aspect of the present invention, in the inner balcony according to any one of the first to fourth aspects of the present invention, the connecting members located on the side surfaces of the truss unit are laterally separated from each other for a predetermined period. The inner balcony is characterized in that the outer shape as a whole is formed in a square shape by the members 78 and the vertical members 76 arranged at intervals, and that the truss unit has an assembly beam having a length extending over the entire depth. Defines the invention of.

According to the fifth aspect of the present invention, the connecting member located on the side surface of the truss unit is an assembly beam having a hollow portion, and has a length extending over the entire depth of the truss unit. Therefore, the connecting member having a predetermined thickness in the height direction can be realized with a relatively light weight. Moreover, it is possible to sufficiently withstand the horizontal stress in the direction from the truss unit to the adjacent house structure.

A method of constructing an inner balcony according to a sixth aspect of the present invention is a method of constructing an inner balcony 10 having a truss unit 16 which is an upper structure and a lower structure 84, wherein the lower structure which supports the truss unit. , The outer truss 20, and the inner truss 52
And a step of fixing the truss unit having the connecting members 70 and 74 connecting the outer truss and the inner truss to the upper portion of the lower structure.

According to the sixth aspect of the present invention, the inner balcony is constructed by constructing the lower structure for supporting the truss unit by the pillar and the wall panel and fixing the truss unit to the upper portion thereof. Therefore,
The inner balcony can be constructed with a small number of on-site construction steps.

According to a seventh aspect of the present invention, in the method of constructing an inner balcony according to the sixth aspect of the present invention, in the step of fixing the truss unit to the lower structure, the hanging jigs 130 attached to four positions of the truss unit. The invention defines a method of constructing an inner balcony, characterized in that the suspension member of the crane is engaged with the truss unit and the truss unit is suspended above the lower structure.

According to the invention described in claim 7, the truss unit can be hung by a crane and fixed on the lower structure. Therefore, the inner balcony can be constructed safely with a small number of on-site construction steps.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

FIG. 1 shows an inner balcony 1 of this embodiment.
It is the perspective view which showed 0 as the state before a roofing material, a finishing material, etc. are attached. As shown in this figure, the inner balcony 10 of the present embodiment has a structure using a truss, and a truss unit 16 forming the upper part of the inner balcony and a truss unit 16 located below the truss unit 16 are provided. And a supporting substructure 84.

The truss unit 16 includes, as shown in FIG. 1, an outer truss 20, an inner truss 52, and an outer truss 20.
And connecting members 70 and 74 for connecting the inner truss 52, and has a triangular prism shape as a whole,
The lower structure 84 with its widest square face down
It is installed on. In addition, this truss unit 16
Is manufactured in advance in the factory. Therefore, by arranging and fixing the truss unit 16 on the lower structure 84, the inner balcony 10 can be obtained, and the man-hours for on-site construction can be reduced.

The outer truss 20 has a triangular shape as a whole, and is constituted by two oblique sides 24, a bottom side, and a gusset plate 48 connecting the respective sides. The bottom portion 28 is formed by joining a beam 32 made of a normal square member, for example, a laminated member, and an assembled beam 36, as shown in an exploded perspective view of a part thereof.

The assembled beam 36 has a length that extends over the entire width of the bottom portion 28, and is a cross member 38 that is spaced apart from each other by a predetermined distance.
And the vertical members 40 arranged at intervals, the outer shape as a whole is formed in the shape of a square member, and has a length over the entire width of the bottom portion 28. The beam 32 and the assembled beam 36 are
As shown in FIG. 3 as a partial exploded perspective view, the bottom portion 28 is fixed and integrated with each other. That is, the hanger bolt 34 is screwed in from the lower surface 30 of the beam 32 to a predetermined depth, and the hanger bolt 34 is attached to the assembled beam 3.
The beam 32 and the assembly beam 36 are brought close to each other until they penetrate through the through holes 46 provided in the cross member 38 at the upper part of 6, and the nuts 44 are clamped by sandwiching the washer 42 from the inside of the assembly beam 36 to fix them to each other. Such beams 32 and assembled beams 3
Fixing with 6 is carried out so as to proceed in parallel at a plurality of points.

As described above, the assembly beam 36 of the bottom portion 28 of the outer truss 20 is provided with the cross members 38 which are arranged so as to be separated from each other for a predetermined period.
And the vertical members 40 arranged at intervals, the upper portion or the lower portion of the assembly beam 36 whose outer shape as a whole is formed in a square shape. Therefore, the bottom part 2
8 without increasing the weight of the entire
The thickness in the height direction can be increased, and it becomes possible to form a wall surface that is preferable in terms of design. Further, it is possible to secure a sufficient thickness in the height direction for attaching the sash frame or the like.

Further, the assembly beam 36 of the bottom portion 28 of the outer truss 20 is, as shown in FIGS.
A vertical member 40 that penetrates from the upper surface to the lower surface is used in the portion where is located. Therefore, this assembly beam 36 is
The supporting force from the pillar 94 can be transmitted to other parts of the truss unit 16 without being dispersed. Further, the supporting force from the pillar 94 can be sufficiently endured.

As shown in FIG. 1, the inner truss 52 has a triangular shape similar to that of the outer truss 20, and connects two oblique sides 58, a bottom side 64, and each of them. It is configured to include a gusset plate 48.

There are a plurality of connecting members 70 and 74, which are arranged between the outer truss 20 and the inner truss 52 to connect them. As shown in FIG. 1, the connecting members 74 located on the side surfaces of the truss unit 16 include the horizontal members 78 that are separated by a predetermined distance and the vertical members 7 that are arranged at intervals.
As a whole, the outer shape of the truss unit 16 is formed in the shape of a square bar, and the truss unit 16 has a length that extends over the entire depth.

As described above, the connecting members 70 and 74 are assembly beams having a hollow portion, and have a length extending over the entire depth of the truss unit 16. Therefore, the connecting member 74 having a predetermined thickness in the height direction can be realized with a relatively light weight. Moreover, it is possible to sufficiently withstand the horizontal stress in the direction from the truss unit 16 to the adjacent house structure.

The lower structure 84 is located below the truss unit 16 and supports the truss unit 16. As shown in FIG. 1, the lower structure 84 includes a front portion that mainly supports the outer truss 20 by the pillars 94, that is, a side facing the outdoors, and a rear portion that mainly supports the inner truss 52 by the wall panels 114 and the pillars 92. It is configured to include a portion which also serves as a wall portion 114 of an adjacent house structure. As described above, since the columns 92 and 94 are used in the lower structure 84, the opening 120 can be easily formed between the lower structure 84 and the upper truss unit 16. Further, since the wall panel 114 is also appropriately used in the rear portion of the lower structure 84, the load bearing wall line of the entire house can be secured.

The columns 92 and 94 of the lower structure 84 have a special structure for fixing the truss unit 16 installed above. That is, as shown in FIG. 4 as a part of an exploded perspective view, the columns 92 and 94 are two rectangular columns.
It is formed by sticking together two square pieces 96 in a vertically divided shape, and the battledore bolt 102 is sandwiched between the two square pieces 96. And battledore bolt 1
Most of the bolt part 106 of 02 is the pillar 9 pasted together.
It protrudes from the upper end surface of 2,94. This bolt part 10
6 is used for fixing the truss unit 16 and the lower structure 84, as described later.

As described above, the pillars 92 and 94 of the lower structure 84 of this embodiment hide the fixing portion 104 of the battledore bolt 102 inside the pillars 92 and 94, and the bolts of the battledore bolt 102 from the center of the pillars 92 and 94. The portion 106 can be projected. Therefore, since the fixing portion 104 of the battledore bolt 102 is not exposed on the side surfaces of the pillars 92 and 94, not only does the pillar become aesthetically excellent, but also the bolt portion 106 is attached with sufficient strength through the fixing portion 104. You can take it and attach it to a pillar. Further, when the bolt portion 106 is passed through the truss unit 16 and tightened with a nut or the like, the binding force is applied directly above the column, and unnecessary shear force components are applied to the bottom portion 28 of the truss unit 16. It never happens.

Further, as is apparent from FIG. 1, the pillar 94 at the front portion of the lower structure 84 is shorter than the pillar 92 at the rear portion. As a result, the height of the bottom portion 28 of the outer truss 20 located above can be increased, and the design balance between the wall surfaces above and below the opening 120 on the outdoor side of the inner balcony 10 can be improved. be able to.

Here, the inner balcony 1 of the present embodiment.
The construction of 0 is explained according to the steps.

First, the columns 92 and 94 and the wall panel 114.
The substructure 84 described above that supports the truss unit 16 is constructed. At this time, as shown as an exploded perspective view in FIG. 4, the bolt portion 106 of the battledore bolt 102 projects from the upper ends of the columns 92 and 94 of the lower structure.

Next, as described above, the truss unit 16 having the outer truss 20, the inner truss 52, and the connecting members 70 and 74 for connecting the outer truss 20 and the inner truss 52.
Are fixed to the upper part of the lower structure 84. FIG. 5 is an exploded perspective view showing a suspending jig 130 used when suspending the truss unit 16 of this embodiment. As shown in this figure, the hanging jig 130 has a fixed portion 132 to which a nut 136 is welded, and an engaging portion 134 that can be screwed to the fixed portion 132 and that is to be engaged with a hanging member such as a crane. Since only the fixing portion 132 that does not protrude from the truss unit 16 can be attached to the truss unit 16 in advance in the hanging jig 130, there is no protruding portion from the outer shape of the truss unit 16 even if the fixing portion 132 is attached. . Therefore, it is convenient when the truss unit 16 is transported. Moreover, the engaging portion 134 can be easily fixed on the spot.
It can be screwed to 32. As shown in FIG. 6, in the truss unit 16 of the present embodiment, the fixing portions 132 are provided at four positions of the truss unit 16, that is, the inner side surface of the oblique side portion 24 of the outer truss 20 and the oblique side portion of the inner truss 52. It is attached to the inner surface of 58. In the truss unit 16, as shown in FIG. 7, a hanging member 142 such as a crane is engaged with the engaging portion 134 of the hanging jig 130 in which the engaging portion 134 is screwed and coupled to the fixing portions 132. , Is suspended and fixed on the lower structure 84.

The lower structure 8 of the truss unit 16
Fixing to 4 is performed as follows.

As described above, the bolt portion 106 of the battledore bolt 102 projects from each of the columns 92 and 94 of the lower structure 84. This bolt portion 106 is used for the outer truss 2 when the truss unit 16 is hoisted down.
The truss unit 16 is hung so as to pass through the through holes provided in the bottom portions 28 and 64 of the 0 and the inner truss 52. In FIG. 8, the bolt portion 106 protruding from the front pillar 94 of the lower structure 84 is the bottom portion 2 of the outer truss 20.
8 shows the state of penetrating the through hole 66 of the assembly beam 36 of No. 8 as an exploded perspective view. The bolt portion 106 also penetrates a through hole (not shown) of the beam 32 shown in FIG. 1 located further above, and a nut is tightened at the upper portion thereof. Each other pillar 92,
Similarly, the bolt portion 106 protruding from 94 also penetrates the bottom portions 28 and 64 of the outer truss 20 or the inner truss 52, and is nut-fastened from the upper portions of the bottom portions 28 and 64. FIG. 9 is an exploded perspective view showing details in the vicinity of the area surrounded by the chain double-dashed line in FIG. 1, in which the bolt portion 106 protruding from the pillar 92 at the rear portion of the lower structure 84 is the bottom portion 6 of the inner truss 52.
4 shows a state before passing through 4.

Further, the truss unit 16 is fixed to the adjacent wall portion 164 of the house structure to prevent the truss unit 16 from falling to the outside. FIG. 10 is an exploded perspective view showing a state of the portion shown by the chain double-dashed line in FIG. 1 as seen from the direction of arrow A. As shown in this figure, the hanger bolt 150, which is also shown in FIG. 11A as a perspective view, is screwed into a predetermined position in advance on the bottom portion 64 of the inner truss 52. After the bottom portion 64 of the truss unit 16 is installed on the upper portion of the wall panel 114 of the lower structure 84, the mounting member 158 (FIG. 11B) that engages with the hanger bolt 150 is
As shown by the chain double-dashed line in FIG.
Is pierced through the opening 160, and is attached to a predetermined position of the wall portion 164 of the adjacent house structure with a nail or the like.
Then, the hanger bolt 150 protruding from the opening 160 of the mounting member 158 is tightened by the nut 154. Since the hanger bolt 150 is provided with the stopper 152 as shown in the figure, the hanger bolt 150 is screwed into the bottom side portion 64 to a predetermined position as described above, and the mounting member 158 is attached to the wall portion. 1
If it is installed in place of 64, nut 15
The truss unit 16 is attached to the wall portion 1 by tightening 4 and bringing the attachment member 158 into contact with the stopper 152.
It can be fixed in a predetermined horizontal position with respect to 64.

As described above, in the inner balcony 10 of this embodiment, the lower structure 84 for supporting the truss unit 16 is constructed by the columns 92, 94 and the wall panel 114, and the truss unit 16 is fixed to the upper part thereof. Be built. Therefore, the inner balcony 10 can be constructed with a small number of on-site construction steps. Further, since the truss unit 16 is hung by the crane and installed on the lower structure 84, the inner balcony 10 can be constructed more safely than in the case where only the manpower is used.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications are possible within the scope of the gist of the present invention or the equivalent range of the claims. Modifications are possible.

For example, in the hanging jig 130, the fixing portion 132 and the engaging portion 134 are not necessarily separable as shown in the above embodiment, and the fixing portion 132 and the engaging portion 13 are not necessary.
You may use what was integrally formed with 4.

The bottom portion 28 of the outer truss 20 of the truss unit 16 of this embodiment is the bottom portion 64 of the inner truss 52.
The thickness in the vertical direction is thicker, and correspondingly, the front pillar 94 of the lower structure 84 corresponds to the rear pillar 9 of the lower structure 84.
Although it is shorter than 2, it is not necessarily limited to this, and the vertical thickness of the bottom portion 28 of the outer truss 20 and the inner truss 52 are not limited to this.
It may be the same as that of the outer truss 2
The thickness of the bottom portion 28 of 0 in the vertical direction may be thinner than that of the inner truss 52. Needless to say, the height relationships of the front and rear pillars 94, 92, etc. of the lower structure 84 need to be adapted accordingly.

[0045]

According to the invention of claim 1, an inner balcony can be obtained by arranging and fixing a prefabricated truss unit on the lower structure, and it is possible to reduce man-hours for on-site construction. it can. Further, since the pillar is used for the lower structure, the opening can be easily formed between the upper truss unit and the upper truss unit. Furthermore, since a wall panel is also appropriately used in the rear part of the lower structure, it is possible to secure a bearing wall line for the entire house.

According to the second aspect of the present invention, the thickness of the bottom portion in the height direction can be increased without significantly increasing the weight of the entire bottom portion, and it is possible to form a wall surface which is preferable in design. Becomes Further, it is possible to secure a sufficient thickness in the height direction for attaching the sash frame or the like.

According to the third aspect of the invention, the assembled beam can transmit the supporting force from the column to the other portion of the truss unit without dispersing the supporting force. In addition, the supporting force from the pillar can be sufficiently endured.

According to the invention of claim 4, since the fixing portion of the battledore bolt is not exposed on the side surface of the pillar, not only the pillar becomes aesthetically excellent, but also the bolt portion can be mounted with sufficient mounting strength. It can be attached to a pillar via a fixing part.
Also, when the bolt part is passed through the bottom part of the truss unit and tightened with nuts etc., the binding force is applied directly above the column, and an unnecessary shear force component is generated on the bottom part of the truss unit. Never.

According to the fifth aspect of the present invention, the connecting member having a predetermined thickness in the height direction can be realized with a relatively light weight. Moreover, it is possible to sufficiently withstand the horizontal stress in the direction from the truss unit to the adjacent house structure.

According to the sixth aspect of the invention, the inner balcony can be constructed with a small number of on-site construction steps.

According to the seventh aspect of the invention, the inner balcony can be constructed safely with a small number of on-site construction steps.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inner balcony of an embodiment in a state before a roof material, a finishing material and the like are attached.

FIG. 2 is an exploded perspective view showing a part of the bottom portion of the outer truss.

FIG. 3 is an exploded perspective view showing a fixed state between a beam on the bottom portion of the outer truss and the assembled beam.

FIG. 4 is an exploded perspective view of a column of a lower structure.

FIG. 5 is an exploded perspective view showing a hanging jig used when hoisting the truss unit of the embodiment.

FIG. 6 is a perspective view showing a state in which a fixing portion of a hanging jig is attached to a truss unit.

FIG. 7 is a perspective view showing a state in which the truss unit is suspended.

FIG. 8 is an exploded perspective view showing a state in which a bolt protruding from a column penetrates an assembled beam at a bottom portion of the outer truss.

9 is an exploded perspective view showing details in the vicinity of a region indicated by a two-dot chain line in FIG.

10 is a diagram showing fixation of a truss unit to an adjacent house structure as an exploded perspective view of a portion indicated by a chain double-dashed line in FIG. 1 as viewed in the direction of arrow A. FIG.

FIG. 11A is a perspective view of a hanger bolt used to fix a truss unit to an adjacent house structure. FIG. 6B is a perspective view of a mounting member that engages with the hanger bolt.

[Explanation of symbols]

 10 Inner Balcony 16 Truss Unit 20 Outer Truss 24,58 hypotenuse part 28,64 bottom part 36 assembly beam 38 horizontal member 40 vertical member 52 inner truss 70,74 connecting member 76 vertical member 78 horizontal member 84 lower structure 92,94 pillar 96 Square bar 102 Battledore bolt 104 Fixed part 130 Hanging jig

Claims (7)

[Claims] 1. An inner balcony having a truss unit as an upper structure, the truss unit being an upper structure of the inner balcony, and a lower structure located below the truss unit and supporting it, the truss The unit has an outer truss having a hypotenuse portion and a bottom portion, an inner truss having a hypotenuse portion and a bottom portion, and a connecting member that connects the outer truss and the inner truss, and the lower structure Is a front part that supports the outer truss with a pillar,
A rear portion supporting the inner truss with at least a wall panel;
Inner balcony characterized by having. 2. The outer shape of the outer truss as claimed in claim 1, wherein the outer truss has a rectangular outer shape as a whole by a horizontal member and a vertical member that are spaced apart from each other. An inner balcony having an assembled beam having a length extending over the entire width of the bottom portion. 3. The inner balcony according to claim 2, wherein the assembled beam has a vertical member penetrating from an upper surface to a lower surface in a portion where the pillar of the lower structure is located directly below the assembled beam. 4. The pillar of the lower structure according to any one of claims 1 to 3, wherein the pillar of the lower structure is formed by sticking two square members in a shape in which a quadrangular prism is vertically divided into two, and a battlement plate bolt is formed. Inner balcony characterized by sandwiching the fixed part of. 5. The connecting member located on the side surface of the truss unit according to any one of claims 1 to 4, wherein the connecting members are separated from each other by a predetermined distance, and the longitudinal members are arranged at an interval. An inner balcony having an overall beam shape formed into a square bar shape, and having an assembly beam having a length extending over the entire depth of the truss unit. 6. A method of constructing an inner balcony having a truss unit which is an upper structure and a lower structure, the method comprising constructing the lower structure supporting the truss unit, an outer truss, an inner truss, and A step of fixing the truss unit having an outer truss and a connecting member for connecting the inner truss to an upper part of the lower structure, and a method for constructing an inner balcony. 7. The truss unit according to claim 6, wherein in the step of fixing the truss unit to the lower structure, the hanging members of the crane are engaged with hanging jigs attached to four positions of the truss unit. Is hung on the upper part of the lower structure, and the inner balcony is constructed.