JP6976887B2 - How to build a building - Google Patents

Description

The present invention relates to a method for constructing a building having an upper beam structure in which a beam is assembled on a predetermined installation floor of the atrium while constructing a building having the atrium.

In the atrium provided in a building such as a high-rise apartment, an upper beam structure in which a beam is assembled on a predetermined installation floor may be installed, and the upper beam structure may be used as a floor of an electric room.
In the conventional installation method of such an upper beam structure, when the building is constructed at least up to the installation floor of the upper beam structure, the materials for constructing the upper beam structure are lifted to the installation floor. , The material is assembled on the installation floor of the atrium.

In the construction work of a building having such a stairwell, a tower crane for lifting building materials is usually installed in the stairwell.
As such a tower crane, a floor climbing type is known (see, for example, Patent Document 1). The floor climbing type tower crane is configured to enable floor climbing in which the mast is replaced with the base pedestal on the upper floor side with the elevating device that can raise and lower the crane part along the mast fixed to the building frame. There is.

Jikkenhei 04-109987

In the atrium of a building, the work of installing the upper beam structure on a predetermined installation floor is a work in a narrow and narrow atrium, so that it is difficult to carry out the work efficiently.
In addition, the installation work of the upper beam structure on the installation floor in the atrium is performed when the base frame of the tower crane installed in the atrium is replaced on the upper floor side of the installation floor, or the atrium. When the tower crane is completely removed from the tower crane, it is necessary to prepare a lifting device for lifting the materials constituting the upper beam structure to the installation floor of the atrium, separately from the tower crane, and work efficiency. It becomes a factor of further deterioration of.

In view of this situation, the main subject of the present invention is a narrow / narrow atrium in a building method in which an upper beam structure is installed on a predetermined installation floor of the atrium while constructing a building having the atrium. The point is to provide a technology that can efficiently install the upper beam structure on the upper installation floor.

The first characteristic configuration of the present invention is a method of constructing a building in which an upper beam structure in which a beam is assembled on a predetermined installation floor of the atrium is installed while constructing a building having the atrium.
A step of attaching the upper beam structure to the base frame of the floor climbing type tower crane installed in the atrium is executed in advance on the lower side of the installation floor in the atrium.
A point of executing an upper beam structure relocation step of relocating the upper beam structure attached to the base pedestal raised by the floor climbing of the tower crane to the installation floor on the installation floor side of the atrium. It is in.

According to this configuration, in the construction work of a building having an atrium, for example, the base pedestal of a floor climbing type tower crane installed in a narrow or narrow atrium is a lower floor below the installation floor of the upper beam structure. By executing the upper beam structure attachment step at the time point located at, the upper beam structure can be attached in advance to the base pedestal of the tower crane by a simple operation on the lower floors. Then, as the construction work progresses, the base pedestal rises step by step due to the floor climbing of the tower crane. Can be raised to the installation floor side above the atrium without the need for. Then, for example, when the base pedestal of the tower crane is located near or above the installation floor, the upper beam structure relocation step is executed to blow through the upper beam structure previously attached to the raised base pedestal. It can be relocated to the floor where the department is installed.
Therefore, according to the present invention, it is possible to provide a building method capable of efficiently installing an upper beam structure on an upper installation floor in a narrow / narrow atrium in a building having a stairwell. ..

The second characteristic configuration of the present invention is that the upper beam structure attached to the base frame has a fall prevention portion for preventing a falling object downward over substantially the entire cross section of the atrium. ..

According to this configuration, since the upper beam structure attached to the base frame has a fall prevention portion such as a deck plate over substantially the entire cross section of the atrium portion, it is not necessary to separately perform drop curing, and the atrium portion does not need to be separately dropped. It is possible to prevent objects falling below the base frame.

The third characteristic configuration of the present invention is that the upper beam structure attached to the base frame has a scaffolding portion for work in the upper beam structure relocation process.

According to this configuration, since the upper beam structure attached to the base pedestal has a work scaffolding portion, the upper beam structure attached to the base pedestal without separately preparing a scaffold in the process of relocating the upper beam structure. The upper beam structure can be relocated to the installation floor by using the work scaffold of the object.

The fourth characteristic configuration of the present invention is that in the upper beam structure mounting process, the base pedestal that has been released from fixing is temporarily floated before the first floor climbing of the tower crane at the atrium. The point is that the upper beam structure is attached in a suspended state.

According to this configuration, the base pedestal of the tower crane is fixed on the lower floor near the ground such as the first floor before the first floor climbing, so that it is on the lower floor in the upper beam structure mounting process. The upper beam structure can be attached to the base mount more easily. In addition, when attaching the upper beam structure to the base pedestal of the tower crane on the lower floors, the base pedestal that has been released from fixing is temporarily floated, so it was installed in the space secured below the floated base pedestal. The upper beam structure can be easily attached in a suspended state.

The fifth characteristic configuration of the present invention is to attach the upper beam structure to the base frame in a suspended state in the upper beam structure attaching step.
In the process of relocating the upper beam structure, the upper beam structure attached to the base pedestal is relocated to the installation floor in a state where the base pedestal is fixed above the installation floor. ..

According to this configuration, since the upper beam structure is attached to the base pedestal of the tower crane in a suspended state, the base pedestal is fixed and stabilized above the installation floor in the upper beam structure relocation process. Then, the upper beam structure attached to the base pedestal in a suspended state can be safely relocated to the installation floor.

The figure which shows the state of the 1st process (a) and 2nd process (b) in the method of refilling a work scaffold using the lifting device of a tower crane. The figure which shows the state of the 3rd process (c) and 4th process (d) in the method of refilling a work scaffold using the elevating device of a tower crane. A diagram showing a state in which a work scaffold is connected to an elevating device in a tower crane. The figure which shows another form of the method of refilling the scaffolding for work using the lifting device of a tower crane. The figure which shows the state of the 1st step (a) and 2nd step (b) of the scaffolding ascending process executed prior to the floor climbing of a tower crane. The figure which shows the state of the 1st process (c) and 2nd process (d) in the floor climbing of a tower crane. The figure which shows the state of the 3rd process (e) and 4th process (f) in the floor climbing of a tower crane. The figure which shows the 5th process (g) in the floor climbing of a tower crane. The figure which shows the state which fixed the base pedestal of a tower crane to the building frame A plan view (a) showing an interference avoidance state of the receiving beam fixed to the base pedestal, and a plan view (b) showing the fixing state of the receiving beam fixed to the base pedestal. The figure explaining the state of a building having a stairwell part

An embodiment of the present invention will be described with reference to the drawings.
In this embodiment, a building construction method and a work scaffolding replacement method carried out in the building construction work will be described.
As shown in FIG. 11, the building A to be built has a stairwell portion B in a substantially central portion like a high-rise condominium or the like, and is constructed so as to surround the atrium portion B. Then, in the atrium B of the building A, for example, a tower parking P or the like is installed on the ground side, and an electric room R or the like is installed above the tower parking P or the like. Further, the electric room R is constructed on the upper beam structure R1 to which a beam fixed to the building frame A1 surrounding the atrium B is assembled.

Then, in the construction work of such a building A, as shown in FIG. 1 and the like, the tower crane C for lifting the building material and the wall portion surrounding the atrium B are constructed in the atrium B. A work scaffold S for performing the above is provided.

As shown in FIG. 3, the work scaffold S is arranged in a substantially square shape in a plan view along the inner wall surface of the building frame A1 surrounding the atrium B, and further surrounds the mast C5. The elevating device C2 is configured to have an elevating device entry space S2 that can be entered from above.
Further, the gantry S1 that supports the work scaffold S can be fixed to the inner wall surface of the building frame A1 via the bracket 10.
That is, in the atrium B, the brackets 10 are fixed to a plurality of places on the inner wall surface of the building frame A1 with anchor bolts or the like, and the gantry S1 is erected on the brackets 10. Then, the work scaffold S can be fixed to the building frame A1 by installing the work scaffold S on the upper surface of the gantry S1. Further, the upper end portion of the work scaffold S thus fixed is connected to the building frame A1 via the wire S3 in order to prevent the work scaffold S from touching.

The detailed configuration of the tower crane C will be described below with reference to FIGS. 5 to 10.
As shown in FIG. 5 and the like, the tower crane C is provided with an elevating device C2 capable of raising and lowering the crane portion C1 along the mast C5.

The elevating device C2 has the same configuration as a known elevating device provided in a general tower crane. For example, the elevating device C2 alternately fixes or opens the upper frame and the lower frame to the mast C5 by the lock pins, and expands and contracts the distance between the upper frame and the lower frame by the hydraulic jack to expand and contract the mast C5. It can be configured to rise or fall along.

As shown in FIG. 9, a receiving beam C4 is fixed to a base frame C3 provided at the lower end of the mast C5, and the receiving beam C4 is attached to the inner wall surface of the building frame A1 surrounding the atrium B. Can be fixed via the bracket 11.
That is, in the atrium B, the brackets 11 are fixed to a plurality of places on the inner wall surface of the building frame A1 with anchor bolts or the like, and the receiving beams C4 are erected on the brackets 11. Then, by fixing the base pedestal C3 provided at the lower end of the mast C5 to the upper surface of the receiving beam C4, the base pedestal C3 can be fixed to the building skeleton A1.

As shown in FIG. 10, the base pedestal C3 has a base portion C3a protruding radially from the lower end portion of the mast C5 and a pair of telescopic beam portions C3b fixed to the lower surface side of the base portion C3a and having both ends expandable and contractible. The receiving beams C4 are fixed to both ends of the pair of telescopic beam portions C3b. Then, by retracting both ends of the telescopic beam portion C3b inward, as shown in FIG. 10A, the receiving beam C4 is separated from the inner wall surface of the building frame A1 provided with the bracket 11. , It is possible to set the interference avoidance state in which the interference between the bracket 11 and the receiving beam C4 in the vertical direction can be avoided. On the other hand, by projecting both ends of the telescopic beam portion C3b outward, as shown in FIG. 10B, the receiving beam C4 is brought close to the inner wall surface of the building frame A1 provided with the bracket 11. , The receiving beam C4 can be set in a fixed state in which the receiving beam C4 can be erected on the bracket 11.

As shown in FIG. 5A, the tower crane C is configured so that the lifting device C2 can be separated from the crane section C1 in a state where the crane section C1 is fixed to the mast C5, and the tower crane C is lifted and lowered in that state. The device C2 can move up and down along the mast C5.
The tower crane C, which will be described in detail later, has the mast C5 on the upper floor side together with the base pedestal C3 in a state where the elevating device C2 capable of raising and lowering the crane portion C1 along the mast C5 is fixed to the building frame A1. It is configured as a floor climbing type that is configured to enable floor climbing.

(How to replace the scaffolding for work)
In the construction work of the building A, a method of refilling the work scaffold S for executing the scaffold elevating step of raising and lowering the work scaffold S by using the elevating device C2 in the tower crane C is executed.
Hereinafter, the details of the method of refilling the work scaffold S will be described with reference to FIGS. 1 and 2.

In the first step of the method of refilling the work scaffold S shown in FIG. 1 (a), the work scaffold S is constructed on the lower floor (for example, the first floor) of the atrium B. At this time, the work scaffold S can be fixed to the building frame A1 via the bracket 10 as described above, but in the present embodiment, the work scaffold S is constructed on the support structure 13 provided on the ground. Then, the work scaffold S is supported by the support structure 13.
Further, in this first step, the elevating device C2 of the tower crane C is located above the mast C5 in a state of being connected to the crane portion C1.

Next, in the second step of the method of refilling the work scaffold S shown in FIG. 1 (b), the crane portion C1 of the tower crane C is fixed on the upper side of the mast C5. The elevating device C2 is separated from C1, and the separated elevating device C2 is lowered to the elevating device entry space S2 formed inside the work scaffold S on the lower side. At this time, the portion of the work scaffold S that interferes with the elevating device C2 may be disassembled as appropriate.
Then, the bottom of the lowered elevating device C2 and the gantry S1 of the work scaffold S are connected in close proximity to each other, and the support structure 13 supporting the work scaffold S (see (a) in FIG. 1). .) Is removed. Then, the work scaffold S is in a state of being supported by the elevating device C2.

Next, in the third step of the method of refilling the work scaffold S shown in FIG. 2 (c), the work scaffold S connected to the elevating device C2 is predetermined by raising the elevating device C2. Raise to the height position of. The process of raising and lowering the work scaffold S by using the lifting device C2 in the tower crane C as in the third step is called a scaffold raising and lowering step.
Then, after raising the work scaffold S to an arbitrary height position, the gantry S1 supporting the work scaffold S is fixed to the inner wall surface of the building frame A1 via the bracket 10.

In this third step, the work scaffold S is connected to the elevating device C2 separated from the crane portion C1 and raised, so that it is for work regardless of the climbing time of the tower crane C and the height of the crane portion C1 at that time. The scaffold S can be raised to any height at any time. Therefore, after climbing the tower crane C, the work scaffold S is refilled a plurality of times to reduce the size of the work scaffold S.
In the present embodiment, the embodiment in which the work scaffold S is raised and refilled has been described, but the work scaffold S can also be lowered and refilled by the same method.

Then, in the fourth step of the method of refilling the work scaffold S shown in FIG. 2D, which is executed next, the work scaffold S is fixed at a predetermined height position in the third step. The elevating device C2 is separated from the work scaffold S. Then, the evacuation device C2 thus separated from the work scaffold S is raised toward the crane portion C1 and retracted from the evacuation device entry space S2 formed inside the work scaffold S.
Then, in this fourth step, the disassembled portion can be reconstructed as appropriate to complete the replacement of the work scaffold S.
In this fourth step, by executing the evacuation step, the elevating device C2 that interferes with the subsequent work on the work scaffold S is separated from the work scaffold S fixed at a predetermined height position. The separated elevating device C2 can be raised and retracted.

Further, as shown in FIG. 4, when a plurality of tower cranes C (two in FIG. 4) are installed in a relatively wide atrium B, along the inner wall surface of the building frame A1 surrounding the atrium B. The work scaffolding S arranged in the above direction can be replaced on the upper floor side by using a plurality of elevating devices C2 provided on the plurality of tower cranes C.
That is, when the work scaffolding S is replaced by using the plurality of elevating devices C2, the crane portions C1 are fixed on the upper side of the mast C5 with the crane portions C1 of each of the plurality of tower cranes C fixed. A plurality of elevating devices C2 separated from the above are lowered to the elevating device entry space S2 formed inside the work scaffold S on the lower side, and the bottom thereof and the gantry S1 of the work scaffold S are connected in close proximity to each other. .. Then, by simultaneously raising the plurality of elevating devices C2 connected to the bottom of the work scaffold S, the work scaffold S connected to the plurality of elevating devices C2 can be raised to a predetermined height position. ..
Further, also in this method of replacing the work scaffold S, since the work scaffold S is connected to the elevating device C2 separated from the crane portion C1 and raised, the work scaffold S is used in each of the plurality of tower cranes C. Climbing of the crane unit C1 by the elevating device C2 can be executed at an arbitrary timing different from the refilling timing.

(Floor climbing)
In the construction work of the building A, floor climbing for climbing the crane portion C1 is executed in the tower crane C. Further, prior to this floor climbing, a scaffold raising step of raising the work scaffold S to the uppermost portion is executed.
The details of the scaffolding ascending process and the subsequent floor climbing will be described below with reference to FIGS. 5 to 8.

The first step and the second step of the scaffolding raising step shown in FIGS. 5A and 5A are scaffolding raising and lowering steps executed prior to floor climbing, and in this scaffolding raising and lowering step, the work scaffolding S is used. Raise to the top. That is, in the first step shown in FIG. 5A, the tower crane C is installed in the atrium B with the base pedestal C3 fixed on a lower floor near the ground, for example, the first floor. The work scaffold S is fixed at a predetermined height position in the atrium B by the above-mentioned method of refilling the work scaffold S. Further, in this state, the receiving beam C4 is already fixed to the base frame C3.

In this first step, with the crane portion C1 of the tower crane C fixed on the upper side of the mast C5, the elevating device C2 is separated from the crane portion C1, and the separated elevating device C2 is used as a work scaffold on the lower side. It is lowered to the elevating device entry space S2 formed inside S. Then, the lowered elevating device C2 and the gantry S1 of the work scaffold S are connected in close proximity to each other, and the bracket 10 supporting the work scaffold S is removed to elevate the work scaffold S. Supported by C2.

In the second step shown in FIG. 5B, which is executed next, by raising the elevating device C2, the work scaffold S connected to the elevating device C2 is attached to the uppermost portion of the building skeleton A1 under construction. Raise to the height of. Then, the gantry S1 that supports the raised work scaffold S is fixed to the inner wall surface of the building frame A1 via the bracket 10. Further, the elevating device C2 is separated from the work scaffold S and raised to be connected to the crane portion C1.
Then, after executing the first step and the second step, the first floor climbing after the third step described later is executed, and at the time of the execution, the work scaffold S rises to the top. Therefore, the base pedestal C3 can be rearranged as upward as possible without the work scaffolding S getting in the way.

In the first step of floor climbing shown in FIG. 6 (c), the lifting device C2 connected to the crane section C1 is formed inside the work scaffold S after the crane section C1 is released from being fixed to the mast C5. The hoisting device is lowered to the approach space S2. Then, in this state, the elevating device C2 is fixed to the building skeleton A1 via the receiving beam C2a erected on the building skeleton A1.

Next, in the second step of floor climbing shown in FIG. 6 (d), the elevating device C2 is operated in a state where the base pedestal C3 to which the receiving beam C4 is fixed is not fixed to the building frame A1 to operate the mast. C5 is raised, and the base mount C3 that has been released from fixing is temporarily floated. Then, on the lower floor near the ground below the base pedestal C3 once floated in this way, the upper beam structure serving as the floor of the electric room R (see FIG. 11) installed on the predetermined installation floor of the atrium B. Insert R1 from the side.

Next, in the third step of floor climbing shown in FIG. 7 (e), the elevating device C2 is operated in the direction opposite to the second step to lower the mast C5, and the mast C5 is lowered to the lower floor of the atrium B. The base mount C3 is brought close to the upper surface of the inserted upper beam structure R1. Then, in this state, as shown in FIG. 9, the upper beam structure R1 is attached to the base frame C3 in a suspended state by using the inverted U-shaped frame body 15.
Then, as in the third step of floor climbing, the step of attaching the upper beam structure R1 to the base frame C3 of the tower crane C in advance on the lower floor below the installation floor of the upper beam structure R1 in the atrium B. Is called the upper beam structure mounting process. That is, by executing such an upper beam structure mounting step, for example, the base pedestal C3 of the tower crane C installed in the narrow / narrow atrium B is a lower layer below the installation floor of the upper beam structure R1. At the time of being located on the floor, the upper beam structure R1 can be attached to the base pedestal C3 in advance by a simple operation on the lower floor.

Next, in the fourth step of floor climbing shown in FIG. 7 (f), the elevating device C2 is operated to raise the mast C5, and the base pedestal C3 is raised to the next fixing floor. At this time, on the next fixing floor of the base pedestal C3, brackets 11 for erection of the receiving beam C4 of the base pedestal C3 are fixed in advance to a plurality of places on the inner wall surface of the building frame A1 and fixed to the base pedestal C3. As described above, the receiving beam C4 is separated from the inner wall surface of the building frame A1 to avoid interference between the bracket 11 and the receiving beam C4 in the vertical direction as an interference avoidance state (state shown in FIG. 10A). is doing.

Then, in the fifth step of floor climbing shown in FIG. 8 (g), which is executed next, when the base pedestal C3 rises to the fixing floor, the receiving beam C4 fixed to the base pedestal C3 is as described above. As a fixing state (the state shown in FIG. 10B) close to the inner wall surface of the building skeleton A1, the receiving beam C4 is fixed to the bracket 11 and the base pedestal C3 is fixed to the building skeleton A1.
At this time, as shown in FIGS. 9 and 10B, the fixing portion of the receiving beam C4 to the bracket 11 is located outside the receiving beam C4, whereas the fixing work is performed inside the receiving beam C4. It needs to be done by the existing worker.

Therefore, the receiving beam C4 is formed with an opening C4a for work, and a worker inside can perform bolt tightening work or the like through the opening C4a. In the illustrated example, the openings C4a are formed at the central portion and both ends of the receiving beam C4, but the formed portion and shape of the opening C4a for this work can be appropriately modified. For example, a notch portion formed by notching a flange portion of the shaped steel constituting the receiving beam C4 may be used. Further, when the building skeleton A1 has an opening for work and the bolt can be tightened from the building skeleton A1 side through the opening, the opening C4a formed in the receiving beam C4 is omitted. It doesn't matter.
Then, in this fourth step, after the base frame C3 is fixed to the building frame A1, the crane portion C1 can be raised to a predetermined height position by the elevating device C2 to complete the floor climbing.

Further, when the above-mentioned floor climbing is performed one or more times, the base pedestal C3 passes through the installation floor where the upper beam structure R1 is installed, rises, and is fixed above the installation floor. , The upper beam structure relocation step of relocating the upper beam structure R1 attached to the base rack C3 to the installation floor is executed.
That is, as the construction work progresses, the base pedestal C3 rises stepwise due to the floor climbing of the tower crane C. Therefore, as the base pedestal C3 rises, the upper beam structure R1 previously attached to the base pedestal C3 can be raised to the installation floor side above the atrium B without requiring other lifting work. Then, for example, when the base pedestal C3 is located near or above the installation floor, by executing such an upper beam structure relocation step, the upper beam structure R1 previously attached to the raised base pedestal C3 is performed. Can be relocated to the installation floor of the atrium B.

It should be noted that this upper beam structure relocation step can also be carried out in the fourth step of floor climbing (see (f) in FIG. 7) without fixing the base frame C3. That is, when the elevated base pedestal C3 passes through the installation floor on which the upper beam structure R1 is installed, the base pedestal C3 is temporarily stopped ascending on the installation floor side of the atrium B. The upper beam structure R1 attached to can be relocated to the installation floor.

Further, as shown in FIG. 9, the upper beam structure R1 includes a deck plate R1a over substantially the entire cross section of the atrium B. The deck plate R1a is previously attached to the base pedestal C3 of the tower crane C, and thus functions as a fall prevention portion for preventing falling objects downward over substantially the entire cross section of the atrium portion B. It will be.
Further, in the beam structure relocation process, the upper beam structure R1 attached to the base frame C3 and the deck plate R1a included therein can be used as a work scaffolding portion.

Further, when the work of relocating the upper beam structure R1 to the installation floor in the atrium B is completed, for example, concrete is placed on the deck plate included in the relocated upper beam structure R1 to perform the floor. Complete the construction work of the electric room R by constructing a part.

[Another Embodiment]
Other embodiments of the present invention will be described. It should be noted that the configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.
(1) In the above embodiment, the upper beam structure R1 that is previously attached to the base frame C3 of the tower crane C and is relocated to the predetermined installation floor of the atrium B of the building A is the electric chamber R (see FIG. 10). ), However, another beam structure constituting the electric chamber R or a beam structure other than the electric chamber R may be used as the upper beam structure R1.

(2) In the above embodiment, the deck plate R1a is included in the upper beam structure R1 previously attached to the base frame C3 of the tower crane C, and the deck plate R1a is made to function as a fall prevention unit for preventing falling objects from the downward side. However, the deck plate R1a is installed after the upper beam structure R1 is moved to a predetermined installation floor of the atrium B of the building A without including the deck plate R1a in the upper beam structure R1. It doesn't matter.

(3) In the above embodiment, in the beam structure relocation process, the upper beam structure R1 attached to the base frame C3 is used as a work scaffolding portion, but another scaffolding is installed to form the upper beam structure R1. The work of relocating the atrium B to the installation floor may be performed.

(4) In the above embodiment, before the first floor climbing of the tower crane C in the atrium B, the base pedestal C3 that has been released from fixing is temporarily floated, and the upper beam structure R1 is installed below the base pedestal C3 and once floated. The base pedestal C3 was lowered and the upper beam structure R1 was attached to the base pedestal C3 in a suspended state. However, the attachment method and attachment timing of the upper beam structure R1 to the base gantry C3 may be appropriately modified. No. For example, the upper beam structure R1 installed below the base pedestal C3 once floated or fixed at a height of the second floor or higher may be lifted and attached by a hoist or the like. ..

A Building B Atrium C Tower crane C3 Base mount R1 Upper beam structure (working scaffolding part, fall prevention part)

Claims (5)

It is a construction method of a building in which an upper beam structure in which a beam is assembled on a predetermined installation floor of the atrium is installed while building a building having an atrium.
A step of attaching the upper beam structure to the base frame of the floor climbing type tower crane installed in the atrium is executed in advance on the lower side of the installation floor in the atrium.
A building that executes an upper beam structure relocation step of relocating the upper beam structure attached to the base pedestal raised by the floor climbing of the tower crane to the installation floor on the installation floor side of the atrium. How to build. The method for building a building according to claim 1, wherein the upper beam structure attached to the base frame has a fall prevention portion for preventing a falling object from falling downward over substantially the entire cross section of the atrium. The building construction method according to claim 1 or 2, wherein the upper beam structure attached to the base frame has a scaffolding portion for work in the upper beam structure relocation process. In the upper beam structure mounting step, before the first floor climbing of the tower crane in the atrium, the upper beam structure is suspended from the base pedestal in a state where the fixed base pedestal is temporarily floated. The method for constructing a building according to any one of claims 1 to 3 to be attached in. In the upper beam structure attaching step, the upper beam structure is attached to the base mount in a suspended state.
Claim 1 for relocating the upper beam structure attached to the base pedestal to the installation floor in a state where the base pedestal is fixed above the installation floor in the upper beam structure relocation step. The building method according to any one of 4 to 4.

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