JP5439121B2 - Building upside-down method - Google Patents

Description

  The present invention belongs to the technical field of the reverse driving method for constructing a basement structure of a building, and in particular, as a means for supporting the essential points of the basement main structure such as a built beam or floor as a supplement. It belongs to the technical field of reverse driving method that secures the strength and rigidity of the basement structure by installing column substitute means with a simple structure to replace the true pillar.

  As shown in FIG. 6, an example of a conventional reverse striking method for constructing a basement structure of a building is as follows. As shown in an example of a plan layout in FIG. 6, a retaining wall 1 in the ground (in the illustrated example, an H steel core 1 a in a soil cement pile However, this is not limited to this example.) And the structural pillar 2 (and its pile 21 = structural pillar) are constructed. Further, there is a case where a column is constructed at an intermediate position between the above-mentioned structural pillars 2 and 2, so that a necessary simple structural column 2 ′ (and its pile 21 ′ = construction base column) is placed between the beams 4 and 4. Build into the site. Then, the inner ground surrounded by the retaining wall 1 is excavated to a required depth, that is, first to a depth necessary to construct a main frame such as a beam and a floor of the ground level floor. A main frame such as a level floor beam and floor and an underground outer peripheral wall is constructed inside the retaining wall 1. In the following, these permanent structures will be used for the support work for retaining the mountain, and the ground will be excavated step by step at a certain depth in order toward the lower floor. It is already a well-known and well-known technique that constructs a basement structure by constructing a basement structure while constructing an intermediate pillar while constructing a frame and using it for support work. There are also many examples.

Japanese Patent Publication No. 6-57958

By the way, with regard to the design and construction of the above-described reverse driving method, the structure of the underground floor structure is not only the main pillar made of the construction pillar 2 but also, for example, many intermediate pillars are constructed to be structurally rational and economical. There is a desire to build a simple underground structure. On the other hand, the upper floor part of the basement floor has a demand for constructing it as a large space room for wide use from the consideration of multipurpose use such as underground shopping centers, etc. .
The middle column has a smaller load to be supported than the main column (hereinafter sometimes referred to as the main column) that continues to the top floor of the building based on the structural column 2, but is constructed in a downward direction. Therefore, it is necessary to support the floor at an intermediate position, so that it is inevitable to construct the construction pillar 2 ′ whose lower end is supported by the pile 21 ′. However, although it is a simple structural column 2 ′ (temporary structural column) and a pile 21 ′ (temporary structural column), it is not easy when actually constructed.
This is because the construction of structural pillars 2 and 2 ', even if it is a simple temporary structural pillar, excavates a pile hole that reaches the deep support layer in the ground, and the bottom of the hole (consolidation part) Even if it is a heavy concrete pile or temporary construction, instead of a concrete pile, a soil support pile (hereinafter also referred to as a pedestal column) that has been injected with cement milk into the ground and stirred is created and inserted into the borehole from the ground. It is indispensable to construct a steel pile (structure column) such as a shape steel by inserting the bottom end into the concrete pile, centering it, building it vertically, and then filling the pile hole with excavated soil. . That is, simple construction requires a lot of labor, work period, and cost, and it is often difficult to measure the vertical accuracy and ensure the accuracy of the construction pillar. However, it is technically difficult to reduce the number of structural pillars provided at the positions of pillars designed to support the floor to be constructed.
As mentioned above, it is easy in terms of design to add a simple column as a means to build a column in the basement structure, but in the actual construction, an additional column is added. Therefore, the burden of the complicated process, the extension of the construction period, and the increase in construction cost is great, and there is a great expectation for the development of other more effective and appropriate solutions.

Therefore, the purpose of the present invention is to construct a rational and economical basement structure by constructing the main pillars necessary for the basement, in accordance with the construction of the reverse striking method for constructing the basement structure of the building. It is to provide a method for installing temporary support means (bar steel material) that is effective for the construction, and a construction method for constructing a main pillar on the assumption of the temporary support means.
Furthermore, it is a construction method that is suitable for constructing the pillars necessary for the basement structure in accordance with the construction of the reverse driving method, in which construction is proceeded downward, which is easy to construct and contributes to shortening the construction period. An object of the present invention is to provide a reverse driving method including a method for installing a large temporary support means (bar steel material) and a construction method for constructing a main pillar on the assumption of the temporary support means.
The next object of the present invention is to install the above-mentioned temporary support means and construct the basement structure of the building, and to construct a basic pillar premised on the temporary support means to make the basement structure rational and simple. In addition to the construction of the main pillar, the construction of the main pillar was omitted (not built) for the basement of the underground floor where there is a margin in the strength and rigidity of the specific basement It is to provide a reverse construction method for buildings that can form a large basement.

As a means for solving the above-mentioned problem, the building backlash method according to the invention described in claim 1 is:
The retaining wall 1 and the pillar 2 are constructed in the ground 3, and the inner ground 3 surrounded by the retaining wall 1 is excavated to a certain depth to construct a main structure such as a beam 4 and a floor 5 on the ground level floor ( 1FL), and this permanent structure is used for supporting the retaining wall 1, and the ground 3 is further excavated step by step at a certain depth, so that the permanent structure such as beams and floors on each underground floor ( (B1FL, B2FL) In the building-up method of building the basement structure by building the basement structure in the downward direction,
As a temporary support means to support the main points of the lower basement main building to be constructed, the steel bar 6 such as a reinforcing bar is fixed to the upper main building (1FL) with sufficient structural support capability. Hanging, fixing this bar steel material 6 to the lower case main frame (B1FL), constructing the lower floor main frame, and adding and extending the bar steel material 6 further downward from the main frame When,
In the same manner, the step of performing stepwise excavation of the ground 3 extending to a certain depth, adding and extending the steel bar 6 downward and fixing it to the lower case main frame, and constructing the main frame, The stage of repeatedly proceeding sequentially toward
Constructing the lowermost foundation structure 7 and fixing the lower end of the steel bar 6 delivered to the foundation structure 7 to the foundation structure 7;
And a step of installing a column reinforcing bar 8 at a position where a main column is to be installed and placing concrete to construct a main column 9 made of reinforced concrete.

The invention described in claim 2 is the reverse driving method of the building described in claim 1,
The stage of constructing the reinforced concrete main pillar 9 by installing the column reinforcement 8 at the position where the main pillar is to be constructed and placing concrete is to construct the lower floor permanent structure supported by the steel bar 6. Proceeding in parallel with the process, or constructing the foundation structure 7 on the lowest floor, and fixing the steel bar 6 delivered to the foundation structure 7 to the foundation structure 7, and then moving upward from the foundation structure level. It is characterized by proceeding toward the main building of each basement floor.
The invention described in claim 3 is the building reverse driving method according to claim 1 or 2,
At the stage where the reinforced concrete main pillar 9 is constructed by installing the column reinforcement 8 at the position where the main pillar is to be constructed and placing concrete, the basement main building on the upper floor is structurally capable If there is room, the construction of the main pillar between the main housing on the specific floor and the main housing on the lower floor will be omitted, and the steel bar 6 will be removed and removed to form a large space room. It is characterized by.

According to the first to third aspects of the present invention, the temporary support means (bar material) and the construction of the main column 9 on the premise of the temporary support means (bar material) are constructed by constructing a conventional temporary column and placing the temporary column on the temporary column. Compared to the number of work required for the construction method to build a pillar and build it into a main pillar, construction period, construction cost, etc., construction is very easy, and it is extremely beneficial for saving construction cost, shortening construction period, etc. Excellent flexibility of application.
That is, the installation of the steel bar 6 as the temporary support means of the present invention has a sufficient structural support capability. For example, the steel bar 6 such as a reinforcing bar is attached to the main frame (1FL) such as the ground level beam 4 and the floor 5. The steel bar 6 is fixed and suspended on the main frame when constructing the main frame such as the floors 51 and 52 on the floor immediately below. Compared with the case of constructing a pillar, the contents of the construction become very simple, and a great effect is obtained in the reduction of the construction cost and the shortening of the construction period.

According to the present invention, the temporary support means adds and extends the bar steel material 6 downward to construct and suspend and support the bar steel material 6 to the main housing when constructing the main housing of the immediately lower floor. Since it is only necessary to repeat the process downward, construction is extremely easy.
The present invention constructs the foundation structure 7 on the lowermost floor, fixes the lower end portion of the steel bar 6 that has reached the base structure 7 to the base structure 7, and the bar 6 Column rebar 8 is attached or, regardless of the position of the steel bar 6, assuming the state of temporary support by the steel bar 6, the column rebar is installed at the position where the main pillar should be constructed and the concrete is cast And building a reinforced concrete main pillar 9, but the method of building the main pillar 9 is to construct each basement above the level of the foundation structure 7 after the foundation structure 7 is constructed. The main pillar 9 is constructed in the upward direction toward the main structure of the floor, or in parallel with the process of proceeding with the construction of the main structure of each floor in accordance with the original construction method of the reverse driving method. Can be implemented by selecting either of the methods.
Thus, by constructing the main pillar 9 and supporting the main housing, it is possible to secure the strength and rigidity of the basement structure sufficiently and to realize a rational basement structure.

  In addition, the feature of the present invention is that in the process of constructing the above-mentioned main pillar 9, the basement main frame (1FL) of a specific upper floor (for example, the ground level floor) has a sufficient structural support capacity. If there is no need to support the main pillar, the main pillar is not constructed between the specific main body (1FL) and the main body (B1FL) on the lower floor. The steel bar 6 is cut out and removed to form a large space room, and the design and construction flexibility and the degree of freedom of selection are such that the large space room can be used for multipurpose use such as parking lots and underground malls.

It is the conceptual top view which showed the planar arrangement | positioning in the Example of the reverse driving method by this invention about the corner part. It is sectional drawing which showed the last step of the process of carrying out the suspension support in implementation of the reverse striking method of the building basement structure by this invention about the principal part. The foundation structure of the bottom floor is constructed by implementing the reverse construction method of the basement structure of the building according to the present invention, and the bottom part of the steel bar material that reaches the foundation structure is fixed to the foundation structure. It is sectional drawing shown about. The cross section showing the main part of the implementation of the reverse striking method of the basement structure of the building according to the present invention, the step of attaching the column reinforcing bar to the steel bar and placing the concrete into the main column of the reinforced concrete structure FIG. It is sectional drawing which showed notionally the Example of the coupling | bonding which adds and extends the bar steel material to the floor, and the means to fix the bar steel material below. FIG. 5B is a cross-sectional view conceptually showing an embodiment different from FIG. 5A. Furthermore, it is sectional drawing which showed the different Example notionally. It is the conceptual top view which showed the planar arrangement | positioning in the Example of the conventional reverse driving method about one corner part.

According to the building reverse construction method according to the present invention, the retaining wall 1 and the construction pillar 2 are constructed in the ground 3, and the inner ground 3 surrounded by the retaining wall 1 is excavated to a certain depth to obtain a ground level floor. The main frame (1FL) such as beams and floors will be constructed, and this ground will be used for supporting the retaining wall 1, and the ground 3 will be excavated step by step at a certain depth. In the construction method of building the basement structure of the building by proceeding downward the process of sequentially building the main frame (B1FL and B2FL) such as beams and floors,
As a temporary support means to support the important points of the main housing, such as the lower basement floor to be constructed, deformed bars or PC steel bars on the upper housings 4, 5 (1FL) on the upper floor with sufficient capacity for structural support The steel bar 6 is fixed and suspended, and the steel bar 6 is fixed to the lower case main frame (B1FL) to construct the lower case main frame, and the main frame is suspended and supported. And extending the steel bar 6 further downward and extending,
Similarly, stepwise excavation of the ground 3 over a certain depth, and the steel bar 6 is extended and extended downward, and is fixed to the main frame such as the floor of the lower floor to construct and support the main frame. A step of sequentially repeating the process of making the process downward,
And while constructing the foundation structure 7 of the lowest floor, fixing the lower end part of the said steel bar material 6 which reached the foundation structure 7 to the foundation structure 7,
And a step of constructing a reinforced concrete main pillar 9 by installing a column reinforcing bar 8 at a position where the main pillar is to be placed and placing concrete.

However, the method of proceeding with the process of constructing the main pillar is a method of constructing the main pillar 9 sequentially in parallel with the process of constructing the lower case permanent structure supported by the steel bar 6 as temporary support means, Alternatively, after building the foundation structure 7, the column reinforcement 8 is installed at the position where the main pillar should be installed from the level of the foundation structure toward the upper basement main frame (B2FL and B1FL). Alternatively, it is possible to appropriately select and implement either a method in which a column reinforcing bar 8 is attached to the steel bar 6, concrete is cast, and the process of building the main column 9 made of reinforced concrete is advanced.
In addition, the process of constructing the reinforced concrete main pillar 9 is that the upper basement floor main frame (for example, the ground level floor main frame = 1FL) has a sufficient structural support capacity. If there is no need for support by a pillar, a permanent pillar is not constructed between the permanent housing on the specific floor and the permanent housing on the immediately lower floor, and the steel bar 6 is further removed and removed. You can choose to form a large space without a pillar.
In this document, “main construction” refers to a structural element that constitutes a permanent building, and “temporary construction” refers to a structural element that is temporarily used in constructing a building (for example, a retaining wall core, It means a mountain retaining support. In other words, the steel bar 6 that is the temporary support means of the present invention is a structural element that is temporarily used. On the other hand, the steel bar 6 has a two-sided property that is also used as a permanent structural element (main pillar). I want you to understand that

In the following, the present invention will be described based on illustrated embodiments.
As shown in FIG. 1, the building reverse construction method according to the present invention is also started by constructing the retaining wall 1 and the structural pillar 2 in the ground. However, the intermediate column pillars 2 ′ and 21 ′ in the intermediate position in the conventional example shown in FIG. 6 are not constructed. Although the mountain retaining wall 1 of FIG. 1 has shown the structure which inserted the H steel core material 1a in the soil cement pile, it is not a limit of this example.
Next, the inner ground 3 surrounded by the retaining wall 1 is moved to a certain depth, specifically, as shown in FIG. 1FL) is excavated to an appropriate depth, and a process of constructing a main frame such as a beam 4 and a floor 5 on the ground level floor and an underground outer peripheral wall in the same place is advanced. The main frame (1FL) such as the beams 4 and 4 'and the floor 5 on the ground level floor can be used for supporting the retaining wall 1 after completion as well as a work floor for proceeding with the construction of the basement structure. , And later, it is also used as a work floor for constructing the ground floor structure, as in the prior art, and the floor 5 is reinforced and stiffened by beams 4 and 4 '.
After that, the ground 3 is further excavated to a depth appropriate for the construction of the next lower-floor floor 51 and the like (B1FL), and the basement 1st floor, such as the beam 4 and the floor 5, is constructed. In this way, the same steps are repeatedly performed downward and the basement structure of the building is basically constructed in the same manner as in the previous embodiment of the reverse driving method.
As shown in FIG. 2, the lower end of the structural pillar 2 is centered to the center of a concrete pile 21 (so-called structural support pillar) formed on the bottom of the pile hole that reaches the support layer in the ground. It is built by performing backfilling after securing the vertical accuracy.
Incidentally, FIG. 2 shows a stage where the construction has progressed to the main frame (B2FL) such as the beam 4 and the floor 52 on the second basement floor. Reference numeral 20 in FIG. 2 is constructed in advance of an integrated structure to the lower floor portion (neck portion) of the structural pillar 2 in accordance with the construction of the main frame such as the beams 4 and floors 5 and 51, 52 of each basement floor. This shows the head of the main pillar.

As a feature of the present invention, FIG. 2 suspends and supports the main points of the following basement floors 51 and 52 from the first basement floor (B1FL), that is, the substantially central part between the spans of the above-mentioned construction pillars 2 and 2. As the temporary support means, the upper end of a plurality of deformed reinforcing bars or PC steel bars or other steel bars 6 is attached to the beam 4 ′ constituting the main frame of the ground level floor (1FL) via the fixing steel plate 61. This shows a stage where the basement floors 51 and 52 are suspended and supported by being fixed and suspended. As described above, the main frame (1FL) on the ground level floor is also constructed as a work floor with a beam 4 'provided at almost the central part between the spans, so that the structural support capacity is sufficient. It is used because it is.
If the plurality of steel bars 6 are deformed reinforcing bars, the upper ends of the steel bars 6 can be used as pillar main bars when constructing the main pillar 9 later, and the ground level floor (1FL) Are fixed and suspended by means such as using a fixing steel plate 61 in the beam 4 ′, which is the main housing of the above. In the case where the steel bar 6 is a PC steel bar, it is installed in a suitable arrangement for supporting the main frame on the lower floor as an arrangement considering the necessity of separately arranging column main bars.
Then, the steel bar 6 was fixed to the floor 51 on the floor immediately below (the B1FL floor in the case of FIG. 2), and the building frame was constructed (concrete casting). In this stage, fixing to the floor 51 is completed, and the main housing is suspended and supported. FIG. 2 shows a structure in which the main section frame of the B2FL floor is constructed, and the steel bars 6 of the next order are further added to project the length that can be processed downward.

Incidentally, a specific example of a configuration in which the steel bar 6 is fixed to the main frame such as the beam 4 or the floor 51 to enable suspension support, and a configuration in which the next steel bar 6 is added downward and can be processed. This is shown in FIGS.
In the embodiment of FIG. 5A, the male screw portion 6a is processed within a certain length range of the lower end portion of the steel bar 6, and the male screw portion 6a is screwed into the female screw hole of each fixing steel plate 61 to perform screw coupling. The male threaded portion 6a projects the female threaded hole of the fixing steel plate 61 downward by a certain length, further projects downward from the lower surface of the floor 51 (or 52), and is added to the lower end of the machine. The structure which screw-joined the upper half of the coupling 11 is shown. That is, fixing is performed by using one fixing steel plate 61 for each steel bar 6 and embedding each fixing steel plate 61 in the concrete of the floor 51 or 52.
In FIG. 5A, the process of extending and extending the steel bar 6 downward is performed by processing the male screw part 6b in the reverse direction in a certain length range of the upper end part of the steel bar 6 of the next rank, and the male screw part 6b in the reverse direction. Is screwed from the lower end side of the mechanical joint 11, and is screwed together while securing a screwing amount of approximately equal length up and down. That is, with respect to the means for fixing the bar steel material 6 to the main housing and the means for extending the bar steel material 6 by sequentially adding downward, it is possible to implement by adopting approximately the current technical level as appropriate.

In addition, as the mechanical joint 11 for joining the upper and lower steel bars 6, 6 in the material axial direction, specifically, a known sleeve joint, squeeze joint, grip joint or the like is appropriately selected and used. Can do. Alternatively, it is also possible to suitably implement a pressure welding joint in which two upper and lower reinforcing bars are butted in the material axis direction and heated and joined by a gas flame or electric heating.
Furthermore, as shown in FIG. 5C, it is also preferable that the mechanical joint 11 is installed in an arrangement so as to be placed on the upper surface of the floor form 10 and embedded in the floor concrete frame in advance. When this method is carried out, the male thread portion 6a formed in advance at the lower end portion of the upper steel bar 6 is screwed into the upper half of the female thread hole of the mechanical joint 11 so as to protrude downward from the fixing steel plate 61. Keep it. Then, the lower half of the female screw hole of the mechanical joint 11 is preliminarily cured to block the female screw hole so that the concrete does not flow, and then placed on the floor formwork 10 to cast concrete. . According to this method, the extension extension portion of the steel bar material 6 does not protrude downward from the floor formwork 10, so that the structure and assembly work of the floor formwork 10 are simplified and convenient. After disassembling the floor form 10, the lower steel bar 6 is screw-coupled to the female screw hole of the mechanical joint 11 with the male screw part 6 b of the reverse screw machined on the upper end thereof.

FIG. 5B shows a different embodiment of the means for fixing the steel bar 6 to the floor 5 or the main frame such as 51 or 52. In the embodiment of FIG. 5B, assuming that the steel bar 6 is a deformed reinforcing bar capable of expecting the adhesion of concrete, a certain length range of its lower end (or upper end) is bent outward substantially at right angles. This is a method in which a shape fixing portion 62 is formed, and this L-shaped fixing portion 62 is arranged in a crossing manner with an orthogonal floor reinforcing bar 63 so that floor concrete is placed and buried in the concrete frame.
FIG. 5B shows that the lower end of the upper steel bar 6 (deformed bar) and the upper end of the lower steel bar 6 are formed in the L-shaped fixing part 62 and fixed on the floor 5 or 51 or 52, etc. Further, the lower steel bar material 6 shows a configuration in which the steel bar 6 of the next order is connected from below via the mechanical joint 11 so that downward addition is possible.

  By the way, in the above-described embodiment, the reaction force of the suspension support of the steel bar 6 is obtained in the beam 4 ′ which is the main frame (1FL) on the ground level floor, and the main frame such as the floor 51 or 52 on the lower floor. The structure which suspends and supports each (B1FL floor or B2FL floor) is shown. However, depending on the design conditions of the building, the floor 51 of the B1FL floor is also provided with the same beam 4 ′ at the substantially central portion between the spans, and the upper end of the steel bar 6 is fixed to the beam 4 ′ of the B1FL floor. It can also be implemented in a configuration that obtains a reaction force that suspends and supports the main housing such as the floor 52 on the lower floor.

  According to the present invention, the construction method of the reverse construction of the building is a stepwise excavation of the ground 3 (so-called root-cutting) to the depth appropriate for the construction of the main building of each lower-level basement floor. Construction is carried out and the steel bar 6 is further extended and extended further downward, and then a main frame such as a floor immediately below is constructed, and the bar 6 is fixed and supported on the main frame. Then, the work of adding and extending the steel bar 6 further downward is sequentially repeated in the downward direction.

As a final stage of the construction of the reverse driving method as described above, FIG. 3 shows a pressure plate 71 and a foundation beam 72 constituting the foundation structure 7 on the lowest floor, and in the illustrated example, a pile of each structural pillar 2. 21 shows a state constructed at a position directly above 21 (a structural pillar). At that time, in parallel with the step of constructing the foundation structure 7, a process of fixing the lower end portion of the steel bar 6 delivered to the foundation structure 7 to the corresponding foundation beam 72 of the foundation structure 7 is performed. Do.
The process of fixing the lower end of the steel bar 6 to the foundation beam 72 of the foundation structure 7 is performed by inserting the lower end of the bar steel 6 into the foundation beam 72 constituting the foundation structure 7 as shown in FIG. A method of embedding and fixing the lower end portion of the steel bar 6 in the concrete frame of the foundation beam 72 by concrete placement of the foundation structure 7 can be suitably implemented.

FIG. 3 also shows the step of fixing the lower end portion of the bar steel material 6 to the foundation structure 7 as described above, and when the bar steel material 6 is a deformed reinforcing bar, the bar steel material 6 is used as a column main bar. Is a PC steel bar with low adhesion of concrete, after placing the column main reinforcement separately, for example, a hoop reinforcement is attached as the column reinforcement 8 and the column form frame 12 corresponding to the height of each floor is assembled. An example is shown in which concrete is laid and reinforced concrete main pillars 9 are constructed for each level to support B2FL and B1FL basement main housings. However, the gist of the present invention is not limited to the construction of the main column 9 using the presence of the steel bar 6 as described above. Assuming that the steel bar 6 exists as a temporary support means, select the position where the main pillar is really necessary, install the column reinforcement 8 independently, assemble the column formwork 12, and cast concrete Although the technical idea of constructing the main pillar 9 is included, the illustration of this embodiment is omitted. In this case, after the construction of the main column 9, the useless steel bar 6 is cut and removed at that time.
FIG. 4 shows a stage in which the construction of the reinforced concrete main pillar 9 is completed between the heights of the basement main housing from the foundation structure 7 to the upper B2FL and B1FL.
In the case of FIG. 4, the constructed main column 9 functions as a main column that supports a substantially intermediate portion of the main frame (B2FL and B1FL) on each underground floor by obtaining a support reaction force on the beam 72 of the foundation structure 7. Contributes to the construction of underground structures with high strength and rigidity.

By the way, the feature of the reverse driving method according to the present invention is that the process of constructing the above-mentioned main pillar 9 has the flexibility of time selection.
Explaining this as an example in which the steel bar 6 is used for the construction of the main pillar, the first construction method is to construct a lower floor main frame that is supported by the bar steel 6 fixed on the upper floor. Concurrently with the step of attaching the column reinforcement 8 to the steel bar 6 between the floor heights of the floor concerned, assembling the column formwork and placing the concrete, and constructing the reinforced concrete main pillar 9 Is a method of proceeding in parallel.
In addition, as a second method in accordance with the construction procedure of the reverse driving method, the above-described foundation structure 7 is constructed, and as a process after fixing the lower end of the steel bar 6 to the foundation structure 7, the foundation structure level From the top to the basement main building (B2FL and B1FL) above, the column reinforcement 8 is attached to the steel bar 6 on each floor, the column form is assembled, and the concrete for the column is placed. It is possible to implement a method of constructing the main pillar 9 and supporting the main housing of each underground floor.
Whether the above-described first or second method is selected and carried out may be determined according to design conditions, construction conditions, and the like for constructing the basement structure. Of course, even in the case of the method of constructing the main pillar 9 at a different position without using the steel bar 6, the same procedure as described above is executed.

By the way, when implementing the above-mentioned 1st, 2nd construction method, the following construction methods can also be implemented together. For example, the above-mentioned ground level main frame (1FL) is provided with the beam 4 ′ on the premise that it is used for various work floors, and there is a surplus in the structural support capacity. Therefore, regarding the ground level main frame (1FL), it is considered that there is no particular need for a pillar that supports it. On the other hand, the underground floor space between the ground level main building (1FL) and the floor 51 of the directly lower floor (B1FL) is configured as a large space room with few pillars such as an underground shopping center or an underground parking lot. There are often requests that you want to use. In the case of the above-mentioned conditions, there is no need to construct the above-mentioned main pillar 9 between the main structure (1FL) at the ground level and the floor 51 of the directly lower floor (B1FL). Building itself is also an obstacle.
Therefore, in the present invention, as a countermeasure for satisfying the above conditions, as shown in FIG. 4, a permanent pillar for supporting a ground-level permanent structure (1FL) with a margin in structural support capability is constructed. It is also a feature that the selection and construction of not to be made possible.
That is, in the embodiment of FIG. 4, the steel bar 6 (see FIG. 3) suspended between the underground base level main frame (1FL) at the ground level and the main base frame (B1FL) on the floor immediately below is provided. All are excised and removed, and there is no main pillar between the floor heights of the two (do not build), and a large underground basement room is formed. The time to excise and remove the steel bar 6 (see FIG. 3) hung between the ground level basement main frame (1FL) and the main floor (B1FL) directly below it, It is after the stage in which the main pillars 9 constructed between the upper floors of the lower-level main housings B1FL and B2FL and the foundation structure 7 exhibit sufficient and sufficient strength.

In short, according to the present invention, the design and construction of whether or not the main pillar 9 is constructed from the foundation structure 7 to any basement main housing above it (up to B1FL in FIG. 4) between each floor height. Can be freely selected and determined according to the structure of the basement of the building, its usage, design policy, and the like.
In any of the above embodiments, in addition to the main pillar that is the main pillar that continues to the top floor of the building on the basis of the construction pillar 2, a different main pillar that supports the basement structure of the basement floor is constructed. Compared to the conventional method of constructing a temporary structural stem column (pile portion) as in the prior art and building the temporary structural column on top of it, the steel bar 6 as in the temporary support means of the present invention. Is fixed to the main building on the upper floor, and the construction method is carried out by suspending and supporting the lower main building with the same steel bar material 6. The construction method is exceptionally simple and has a great effect on shortening the construction period. Is played.

  Although the present invention has been described based on the illustrated embodiment, the gist of the present invention is not limited to the illustrated embodiment. It will be mentioned as a reminder that the present invention includes the scope of design changes and other modifications / applications made by those skilled in the art as needed.

DESCRIPTION OF SYMBOLS 1 Retaining wall 1a Retaining wall core material 2 Truth pillar 3 Ground 4 Beam 5, 51, 52 Floor 6 Steel bar material (temporary support means)
61 Steel sheet for fixing
7 Foundation structure 70 Floor of foundation structure 8 Column reinforcement 9 Main column 11 Mechanical joint

Claims (3)

Building a retaining wall and a pillar in the ground, excavating the inner ground surrounded by the retaining wall to a certain depth to construct a ground structure such as beams and floors on the ground level floor. Is used for supporting the retaining wall, and the ground is further excavated step by step at a certain depth. In the reverse construction method of building
As a temporary support means to support the important points of the lower basement main building to be constructed, steel bars such as reinforcing bars are fixed and suspended on the upper main building with sufficient structural support capacity. Fixing the steel bar material to the lower case main frame, constructing the lower level main frame, adding and extending the bar steel material further downward from the main frame; and
In the same manner, the step of performing stepwise excavation of the ground extending to a certain depth, adding the steel bar material downward and extending it, fixing it to the lower case main frame, and constructing the main frame is directed downward. A step that repeats sequentially,
Constructing the lowermost foundation structure and fixing the lower end of the steel bar material delivered to the foundation structure to the foundation structure;
A method of reversing a building, comprising the step of installing a column reinforcing bar at a position where a permanent column is to be installed and placing concrete to construct a permanent column made of reinforced concrete.   The stage of constructing the reinforced concrete main pillar by installing the column reinforcing bar at the position where the main pillar should be installed and placing concrete is in parallel with the process of constructing the lower floor permanent structure supported by steel bars Or after constructing the foundation structure of the lowest floor and fixing the steel bar material delivered to the foundation structure to the foundation structure, each basement main building structure above the foundation structure level The method of striking a building according to claim 1, wherein the building is reverse-turned.   At the stage of constructing a reinforced concrete main pillar by installing a column reinforcing bar at the position where the main pillar should be installed and placing concrete, the basement main frame of the upper specific floor has a sufficient capacity for structural support The construction of the main pillar between the main housing of the specific floor and the main housing of the floor immediately below is omitted, and the steel bar material is also cut out and removed to form a large space room. The method of reversing a building according to claim 1 or 2.

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