Construction method

Abstract

To create areas where reinforcing bars do not protrude from a preceding slab to improve work efficiency on the preceding slab.SOLUTION: A construction method comprises: a preceding floor construction step of embedding a sheath pipe 70 into a joint portion 35 of a designated area SA and embedding a reinforcement bar 41 into the joint portion 35 of a non-designated area SB to construct a first-floor slab 32A; a non-designated area construction step of constructing a high-rise portion 12 of the non-designated area SB of the preceding floor 32A while utilizing the constructed slab 32A; and a designated area construction step of constructing a lower portion 14 of the designated area SA by inserting column main reinforcement bars 40 into a first tubular member 70 of the designated area SA.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a construction method. [Background technology]

[0002] Patent Document 1 discloses a technique for joining precast concrete columns and beams, which enables beams to be joined at the column-beam joints using on-site joints. In this prior art, precast concrete columns of the lower floor are erected, with column joint members embedded in the column capitals to connect the column main reinforcement. The beam ends of multiple precast concrete beams are placed on the end faces of the column capitals of the lower floor columns so that the beam bodies extend, for example, in the left-right and / or front-to-back directions within the same horizontal plane. The beam main reinforcement connection ends protruding from the opposing beam ends are connected using on-site beam joints. Precast concrete columns of the upper floor, which have column joint members at the column capitals and column main reinforcement connection ends protruding from the end faces of the column bases, are placed above the lower floor columns and beams. The column main reinforcement connection end of the upper floor column is passed between the on-site beam joint means and the beam main reinforcement connection end and inserted into the column joint member of the lower floor column, and a filler such as concrete or mortar is poured into the joint surrounded by the upper and lower floor columns and multiple beams, and the column main reinforcement connection end of the upper floor column is fixed within the column joint member of the lower floor column.

[0003] Patent Document 2 discloses a technique for a structure composed of an above-ground framework and an underground framework separated by a leading floor used for a work platform, and a method for constructing the same. This prior art includes a ground excavation process in which a retaining wall is constructed and the ground is excavated down to the bedding surface, a foundation framework construction process in which pressure-resistant concrete (foundation framework) is constructed on the bedding surface, a subway frame erection process in which a steel framework composed of steel columns and steel beams is erected on top of that, and a leading floor construction process in which a leading floor is constructed on top of the steel framework, and by constructing the above-ground framework using the leading floor as a work platform, the construction work for the above-ground framework and the underground framework can be carried out in parallel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-144894 [Patent Document 2] Japanese Patent Application Publication No. 2023-102967 Summary of the Invention [Problem to be solved by the invention]

[0005] The preceding floor has protruding rebars, such as the reinforcing bars where the main column reinforcement is connected. The protruding rebars can get in the way, for example, when the preceding floor is used as a material storage area or when working with heavy machinery, and can reduce work efficiency.

[0006] In view of the above, the present invention aims to improve work efficiency on the preceding floor by providing an area on the preceding floor where reinforcing bars do not protrude. [Means for solving the problem]

[0007] The first aspect is a construction method comprising a preceding floor construction step of constructing a preceding floor by embedding a first tubular member in the joint portion of a set area and embedding column reinforcing bars in the joint portion of an outside set area; a set outside area construction step of constructing the outside set area on the floor above the preceding floor while using the constructed preceding floor; and a set area construction step of dropping column main reinforcement bars into the first tubular member in the set area to construct the set area on the upper floor.

[0008] In the construction method of the first aspect, since no reinforcing bars protrude into the set area of ​​the preceding floor, work efficiency at the preceding floor is improved.

[0009] A second aspect is the construction method according to the first aspect, further comprising a lower floor column construction step in which a second tubular member is attached to the tip of the column main reinforcement for the column directly below the set area of ​​the floor below the preceding floor, and the column main reinforcement is dropped into the first tubular member and the second tubular member in the set area construction step.

[0010] In the second construction method, by constructing a pillar directly below the set area of ​​the floor below the preceding floor, the load-bearing capacity of the set area of ​​the preceding floor is increased compared to when there is no pillar directly below the set area.

[0011] A third aspect is a construction method according to the first or second aspect, in which the preceding floor is supported by structural columns, and in the non-designated area construction process, the non-designated area is constructed on the basement floor and the ground floor.

[0012] In the construction method of the third aspect, the advance floor is supported by the structural columns, so that the advance floor can be used without supporting it with shoring or the like, even before the columns directly below the designated area of ​​the advance floor are constructed. [Effects of the Invention]

[0013] According to the present invention, an area where no reinforcing bars protrude from the preceding floor can be provided, thereby improving work efficiency on the preceding floor. [Brief explanation of the drawings]

[0014] [Figure 1] This is a process diagram of the construction method of the first embodiment in which a retaining wall, a pile for a structural column, and a structural column are constructed. [Figure 2] This is a process diagram of the construction method of the first embodiment, in which the first floor floor and beams have been constructed with the structural columns as support. [Figure 3] This is a process diagram of the construction method of the first embodiment, showing the state in which the set outside area of ​​the first floor above ground and the floor and beams of the first basement floor have been constructed. [Figure 4] This is a process diagram of the construction method of the first embodiment, showing the state in which the pillars on the first basement floor have been constructed. [Figure 5] This is a process diagram of the construction method of the first embodiment, in which the set area on the first floor is used as a material storage area and heavy machinery is placed on it for work. [Figure 6] FIG. 10 is a process diagram of the construction method of the first embodiment when dropping the column main reinforcement into the sheath pipe. [Figure 7] FIG. 4 is a cross-sectional view of a main part of the setting area of ​​the first floor in the process diagram of FIG. 3. [Figure 8]5 is a cross-sectional view of a main part for explaining a method of constructing a pillar in a set area of ​​the process chart of FIG. 4. FIG. [Figure 9] This is a process diagram of the construction method of the second embodiment, in which the set area on the first floor is used as a material storage area and heavy machinery is placed on it for work. [Figure 10] FIG. 10 is a process diagram of the construction method of the second embodiment when dropping the column main reinforcement into the sheath pipe. [Figure 11] FIG. 1 is a schematic structural diagram of a building. [Figure 12] This is a process diagram of a modified construction method when dropping main column reinforcement into a precast concrete column. DETAILED DESCRIPTION OF THE INVENTION

[0015] First Embodiment A method for constructing a building according to a first embodiment of the present invention will now be described. The building according to this embodiment is constructed using a reverse construction method.

[0016] It should be noted that each drawing is merely a schematic illustration. Furthermore, the dimensions, ratios, etc. of each element shown in the drawings may not necessarily correspond to the actual ones. Furthermore, the dimensions, ratios, number, etc. of each element may not necessarily correspond between multiple drawings. Furthermore, in this embodiment, explanations of configurations not directly related to the present invention and well-known configurations may be omitted or simplified. This also applies to the second embodiment and modified examples described below.

[0017] [Buildings] First, the general structure of the building of this embodiment will be described.

[0018] The building 10 of this embodiment shown in Figure 11 is constructed with reinforced concrete columns 30, floors 32, and beams 34 (see Figures 2 and 8, etc.) as its main frame. Note that "floor" can also be referred to as "slab." Note that the floor of the first floor, which is an example of a preceding floor, may be designated as floor 32A with an A added after the reference number. When there is no need to distinguish between them, the floor of the first floor will also be referred to as floor 32.

[0019] The building 10 has a ground floor 16 and a basement floor 18, and the ground floor 16 has a high-rise section 12 and a low-rise section 14 that is lower than the high-rise section 12. Reference numeral 40 denotes the main reinforcement of a reinforced concrete column 30. Reference numeral 11 denotes a retaining wall, reference numeral 20 denotes a pile for a structural column, and reference numeral 22 denotes a structural column 22.

[0020] The symbol SA denotes a set area on the first floor 32A, and the symbol SB denotes a non-set area on the first floor 32A. The set area SA and the non-set area SB will be described later.

[0021] [Construction method] Next, a construction method for the building 10 of this embodiment will be described with reference to Figures 1 to 8. As described above, the building 10 of this embodiment is constructed by the inverted construction method.

[0022] First, the reverse construction method will be briefly explained.

[0023] The inverted construction method is a construction method in which the underground structure of a building is constructed from the top down. Specifically, the floors of each floor below ground level are constructed as supports to hold down the earth retaining walls, while the ground is dug down one layer at a time.

[0024] Structurally, floors are supported by pillars and beams, so pillars are required to construct the floors. Therefore, pillars called structural pillars are buried in the ground beforehand, and then these structural pillars are excavated and the beams and floors of the basement floor are constructed.

[0025] In the construction method of the building 10 of this embodiment, first, as shown in Figure 1, a frame-shaped earth retaining wall 11 is constructed on the ground G. Then, a plurality of structural column piles 20 are constructed inside the earth retaining wall 11, and a structural column 22 is buried in each structural column pile 20.

[0026] Next, as shown in Figure 2, the ground G is excavated slightly to unearth the structural columns 22, and the first floor 32A and beams 34, which serve as an example of a preliminary floor, are constructed using the structural columns 22 as support. At this time, sheath pipes 70, which serve as an example of a first tubular member, are embedded in the joints 35 of the columns 30 in the set area SA (see also Figure 7). Furthermore, cross bars 41, which serve as an example of reinforcing bars, are embedded in the joints 35 of the columns 30 in the non-set area SB. For ease of understanding, the sheath pipes 70 are shown in dashed lines except in Figures 7 and 8.

[0027] The set area SA in this embodiment is an area in which the first floor 32A is used as a work area. In this embodiment, the area of ​​the low-rise section 14 is set as the set area SA, and the area of ​​the high-rise section 12 is set as the non-set area SB. In this embodiment, the reinforcing bars 41 are embedded in the outer periphery of the first floor 32A, but the reinforcing bars 41 do not have to be embedded in the outer periphery.

[0028] Furthermore, "intersection bars" refer to reinforcing bars that are installed in advance at the locations where concrete is to be poured in order to integrate the structure. In this embodiment, the intersection bars 41 are integrated with the column main reinforcement bars 40 by joints. The intersection bars 41 constitute part of the column main reinforcement bars 40. The joint type that can be used includes lap joints, pressure joints, welded joints, mechanical joints, etc.

[0029] Next, as shown in Figure 3, the constructed first floor 32A is used as shoring to support the retaining wall 11, and the set outside area SB for the first floor of the above-ground floor 16 is constructed. In addition, the depth of one basement floor is dug down to construct the floor 32 and beams 34 of the first basement floor of the basement floor 18, and reinforcing bars 41 are buried in each joint 35.

[0030] Next, the pillars 30 on the first basement floor are constructed as shown in Fig. 4. Here, the construction of the pillars 30 on the first basement floor directly below the set area SA will be described with reference to Fig. 8.

[0031] As shown in Figure 8, first, a column 30 is constructed partway. A sheath pipe 72, an example of a second tubular member, is inserted and attached to the tip of the column main reinforcement 40 arranged at the upper end 31 of the partially constructed column 30. It is made to protrude from the upper end 31. The upper end 72A of the protruding sheath pipe 72 is joined and connected to the lower end 70A of the sheath pipe 70 at the joint 35 of the first floor floor 32A. Then, a gap K is formed between the upper end 31 of the partially constructed column 30 and the joint 35.

[0032] Next, as shown in Figure 5, the set area SA on the first floor 32A is used as a material storage area and heavy machinery 90 is placed on it for work. Then, the upper section 12 of the above-ground floor 16 and the basement floor 18 are constructed simultaneously. Note that before the columns 30 on the first basement floor are constructed, the set area SA may be used as a material storage area and heavy machinery 90 may be placed on it for work.

[0033] Next, as shown in Figure 6, when it is no longer necessary to use the set area SA of the first floor 32A as a material storage area or to place heavy machinery 90 thereon for work, the column main reinforcement bars 40 are dropped into the sheath pipes 70, 72, and the sheath pipes 70, 72 are filled with grout. Then, as shown in Figure 11, the above-ground floor 16 of the set area SA is constructed, and the building 10 is completed.

[0034] It is also possible to omit the work of joining the sheath pipe 70 and the sheath pipe 72 by previously setting the length of the sheath pipe 70 to include the length of the sheath pipe 72 on the lower floor. Alternatively, the sheath pipe 72 may be omitted, and the main column reinforcement 40 of the column 30 on the lower floor may be made to protrude from the upper end portion 31, and integrated in the gap K region using pressure welding or a mechanical joint.

[0035] [Effect] Next, the operation of this embodiment will be described.

[0036] In the joint section 35 of the set area SA of the first floor floor 32A, which is the preceding floor, the sheath pipe 70 is buried without placing the reinforcement bars 41. Then, after the use of the set area SA of the floor 32A has finished, the main column reinforcement bars 40 are dropped in from above. In this way, the reinforcement bars 41 do not protrude from the set area SA of the first floor floor 32A when in use, which improves work efficiency on the floor 32A compared to when the reinforcement bars 41 protrude when in use.

[0037] Furthermore, by constructing a pillar 30 directly below the set area SA on the first basement floor below the first floor floor 32A, the load-bearing capacity of the set area SA of floor 32A is increased compared to when there is no pillar 30 directly below the set area SA.

[0038] Second Embodiment Next, a method for constructing a building according to the second embodiment will be described. The building according to this embodiment is constructed using the inverted construction method. The same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted or simplified. This embodiment is also similar to the building 10 shown in FIG. 11.

[0039] [Construction method] The construction method of the building 10 of this embodiment will be explained using Figures 9 and 10. The building 10 of this embodiment is also constructed by the inverted construction method, as in the first embodiment. Also, only the parts of the construction process that are different from the first embodiment will be explained.

[0040] In this embodiment, the steps are the same as those in Fig. 3. In the construction method of this embodiment, as shown in Fig. 9, only the pillars 30 directly below the set area SA on the first basement floor below the first floor 32A are not constructed, and the set area SA on the floor 32A is used as a material storage area or heavy machinery 90 is placed on it for work.

[0041] As shown in Figure 10, when it is no longer necessary to use the set area SA on the first floor 32A as a material storage area or to carry heavy machinery 90 thereon, the column main reinforcement 40 is dropped into the sheath pipe 70, the column 30 directly below the set area SA on the first basement floor is constructed, and grout is filled into the sheath pipe 70. Then, as shown in Figure 11, the above-ground floor 16 of the set area SA is constructed, and the building 10 is completed.

[0042] [Effect] Next, the operation of this embodiment will be described.

[0043] Since the reinforcement bars 41 do not protrude into the set area SA of the first floor floor 32A, which is the preceding floor, work efficiency on the floor 32A is improved compared to when the reinforcement bars 41 protrude.

[0044] Furthermore, since the area directly below the set area SA on the first basement floor, which is the floor below the first floor floor 32A, is supported by structural columns 22, even before the columns 30 directly below the set area SA are constructed, the set area SA on floor 32A can be used as a material storage area or heavy machinery 90 can be placed on it for work without supporting floor 32A with shoring or the like.

[0045] <Other> The present invention is not limited to the above embodiment.

[0046] For example, in the above embodiment, only the column main reinforcement bars 40 are dropped into the sheath pipes 70, 72, but this is not limited to this. For example, as shown in Fig. 12, the column main reinforcement bars 40 protruding from a precast concrete column 92 may also be dropped into the sheath pipes 70, 72.

[0047] Furthermore, for example, in the above embodiment, the construction method of the present invention is applied to the inverted construction method, but is not limited to this, and may also be applied to the forward construction method.

[0048] In addition, for example, in the above embodiment, the preceding floor that is the set area SA used as a material storage area or on which heavy machinery 90 is placed for work is the first floor 32A, but this is not limited to this. The preceding floor that is the set area SA may be the basement floor 32 or the second or higher floor 32 above ground.

[0049] In addition, for example, in the above embodiment, the reinforcing bars 41 are embedded in the joint portion 35 of the set out area SB of the first floor 32A as an example of the preceding floor, but this is not limited to this. Reinforcing bars other than the reinforcing bars 41 may also be used.

[0050] Furthermore, for example, in the above embodiment, the set area SA is the lower floor section 14 of the ground floor 16, but is not limited to this. The set area can be set freely.

[0051] In addition, for example, in the above embodiment, the column main reinforcements 40 are dropped into the entire set area SA of the floor 32A, but the present invention is not limited to this. For example, depending on the construction situation, the column main reinforcements 40 may be dropped into only a part of the set area SA of the floor 32A to construct part of the low-rise section 14, and then the column main reinforcements 40 may be dropped into the remaining area of ​​the set area SA to construct the rest of the low-rise section 14.

[0052] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. A plurality of embodiments and modifications can be implemented in combination as appropriate. [Explanation of symbols]

[0053] 10 Buildings 16 Ground Floor 18 Basement Floor 22 Structure pillar 30 pillars 32 beds Floor 32A (example of a previous floor) 34 Beam 35 Joint 40 Column main reinforcement 41 Reinforcement bar (an example of a reinforcing bar protruding from a preceding floor) 70 Sheath tube (an example of a first tubular member) 72 Sheath tube (an example of a second tubular member) G Ground SA configuration area SB outside setting area

Claims

1. a preliminary floor construction step of embedding a first tubular member in the joint portion of the set area and embedding a reinforcing bar in the joint portion of the non-set area to construct a preliminary floor; A non-set area construction process for constructing the non-set area on the upper floor of the preceding floor while using the constructed preceding floor; a setting area construction step of constructing the setting area on the upper floor by dropping column main reinforcement into the first tubular member in the setting area; A construction method comprising:

2. The column directly below the set area of ​​the lower floor of the preceding floor further includes a lower floor column construction step of attaching a second tubular member to the tip of the column main reinforcement and connecting it to the first tubular member, In the setting area construction step, the column main reinforcement is dropped into the first tubular member and the second tubular member. The construction method according to claim 1.

3. The preceding floor is supported by structural columns, In the non-set area construction step, the non-set area is constructed on the basement floor and the ground floor.

3. The construction method according to claim 1 or claim 2.

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