Building construction method and building

Abstract

To provide a building construction method for efficiently constructing a building, and a building.SOLUTION: Gantry piles 51 of a gantry 50 on which a construction machine 60 used in a construction work of a building is placed are provided at positions where they can be buried in columns 25c of an underground structure 20 of the building. Then, the gantry 50 is installed so as to be supported by the gantry piles 51. Thereafter, the gantry piles 51 are buried in the columns 25c of the underground structure 20 of the building.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a building and a method for constructing a building using a construction machine mounted on a gantry supported by gantry piles. [Background technology]

[0002] When constructing a building, the ground is excavated to create a space within the ground. For buildings with underground structures, the ground must be excavated deeply. In this case, a work platform is required to support the construction machinery used to excavate the ground. The work platform is supported by gantry piles supported on hard ground. However, when the hard ground is deep, the gantry piles become long, resulting in increased costs. Therefore, a structure in which the lower part of the gantry pile is buried in the upper part of the building pile has been considered (see, for example, Patent Document 1). In the method for forming a gantry pile described in this document, the lower part of the gantry pile for the work platform is driven into the upper part of a foundation pile formed in place to support the building's foundation, before the cast-in-place concrete of the foundation pile has solidified at the top. This embeds a portion of the gantry pile into the upper part of the foundation pile, integrating it with the foundation pile. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-129386 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the gantry piles described in Patent Document 1 are positioned to avoid the foundation columns and upper steel columns of the foundation frame of the building. Therefore, when constructing the frame of the building, it was necessary to remove the gantry piles above the foundation frame. Furthermore, the removed parts needed to be repaired after removal. When performing such removal and repair work, it was difficult to efficiently construct the building. [Means for solving the problem]

[0005] A method of constructing a building that solves the above problem involves placing gantry piles for a gantry on which construction machinery used in building construction work is placed in a position where they can be buried in the pillars of the building's underground structure, installing the gantry so that it is supported by the gantry piles, and burying the gantry piles in the pillars of the underground structure, thereby constructing the building. Furthermore, a building that solves the above problem is a building having an underground structure, and is constructed by burying gantry piles for a gantry on which construction machinery used in the construction work of the building is placed into the pillars of the underground structure. [Effects of the Invention]

[0006] According to the present disclosure, buildings can be constructed efficiently. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a front view illustrating the configuration of the work platform according to the embodiment. [Figure 2] FIG. 10 is an explanatory diagram illustrating a building in which the platform piles of the working platform of the embodiment are buried. [Figure 3] FIG. 2 is a perspective view illustrating the connection structure between the platform pile of the work platform and the above-ground structure of the building in the embodiment. [Figure 4] 1 is a flow chart illustrating a method for constructing a building in an embodiment. [Figure 5] FIG. 10 is a perspective view illustrating the connection structure between the gantry pile of the work gantry and the above-ground structure of the building in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] A method for constructing a building and an embodiment of the building will be described below with reference to Figures 1 to 4. Here, a method for constructing a building having an underground structure and a building constructed by this method will be described.

[0009] Fig. 1 is a front view showing the state in which the work gantry 50 is installed, and Fig. 2 is a front view showing the state in which the building B1 is installed. Fig. 3 is a perspective view illustrating the connection structure between the gantry pile 51 of the work gantry 50 and the column 31 of the above-ground structure 30 of the building B1.

[0010] (Configuration of Building B1) First, the configuration of the building B1 to be constructed will be described. 2, the building B1 is constructed in an underground excavation area 15 formed by excavating the ground G1 from the surface of the earth. The underground excavation area 15 is surrounded by an earth retaining wall 11.

[0011] The building B1 has an underground structure 20 and an above-ground structure 30. The underground structure 20 is made of reinforced concrete, and includes piles (permanent piles) 21 that support the building B1, and a basement floor portion 25.

[0012] The piles 21 reach down to the hard ground G2 below the ground G1, and the building B1 is supported by the hard ground G2. The basement floor portion 25 is disposed within the underground excavation area 15, and has a plurality of basement floor columns 25c and beams.

[0013] In this embodiment, above each pile 21, a basement pillar 25c is disposed so that the central axis of the pillar 25c and the central axis of the pile 21 are substantially aligned.

[0014] Furthermore, gantry piles 51 that support a work gantry 50 are embedded in a plurality of the columns 25c. The gantry piles 51 extend from the top of the piles 21 so as to penetrate through the top of the basement floor portion 25.

[0015] The above-ground structure 30 includes a plurality of steel columns (steel columns) 31 and a plurality of beams 35. The lower end of the column 31 is integrally fixed to the upper end of a platform pile 51 embedded in a column 25c of the basement floor portion 25.

[0016] 3, a substantially square-shaped top plate 52 at the upper end of the gantry pile 51 and a substantially square-shaped base plate 32 are fixed together with their opposing surfaces in contact with each other via bolts 33 and nuts 34. The base plate 32 is fixed integrally to the lower end of the column 31 of the above-ground structure 30 by welding.

[0017] (Work platform configuration) Next, the configuration of the work platform 50 will be described with reference to Figure 1. This work platform 50 carries a construction machine 60 used in construction work such as excavating the ground to construct the above-mentioned building B1.

[0018] As shown in Figure 1, the work gantry 50 has gantry piles 51, joists 55, joists 56, 57, and a covering plate 58. The lower part of the gantry pile 51 is fixed to the upper part of the pile 21 of the building B1. The gantry pile 51 supports the work gantry 50 on the hard ground G2 via the pile 21.

[0019] In this embodiment, as shown in FIG. 2, each gantry pile 51 is arranged so that its central axis substantially coincides with the central axis of the pile 21.

[0020] The gantry pile 51 is made of an H-shaped steel. A top plate 52 made of a steel plate is fixed to the top end of the gantry pile 51. The joists 55 are disposed on the top plates 52 of the gantry piles 51. The joists 55 are made of H-shaped steel and are disposed so as to extend in a direction perpendicular to the plane of the paper in FIG.

[0021] The joists 56, 57 are arranged in a direction perpendicular to the joists 55. The joists 56 are fixed in a state in which they are placed on the joists 55. The joists 57 are fixed in a state in which they are stretched across the joists 55 at the left end and the ground. The covering plate 58 is hung over the joists 56, 57. A construction machine 60 is placed on the covering plate 58.

[0022] (How to build a building) Next, a method for constructing the building B1 will be described with reference to FIG. First, piles are installed (step S1). Specifically, first, a retaining wall 11 is buried in the ground G1 around the land on which the building B1 is to be installed. Then, pile holes are excavated in the ground G1. Then, a reinforcing bar cage is placed in the pile hole, and concrete is poured into the pile hole to form the pile 21. Here, before the concrete in the pile 21 completely hardens, the lower end of the gantry pile 51 is buried in the top of the pile 21. In this way, the gantry pile 51 is integrated with the pile 21. In this case, the gantry pile 51 is positioned to be buried in the column 25c of the basement floor portion 25.

[0023] Next, the work platform 50 is set up (step S2). Specifically, the joists 55, the floor joists 56, 57, and the covering plate 58 are placed. Next, excavation work is carried out using the construction machine 60 placed on the work platform 50 (step S3). Specifically, the construction machine 60 is used to form the underground excavation area 15.

[0024] Next, the basement floor of the building is constructed (step S4). Here, a foundation framework is formed on the multiple piles 21, and the basement floor 25 is constructed from below. Specifically, first, on the lower floors, rebar is arranged and formwork is placed so that the gantry pile 51 is embedded in the center. Then, concrete is poured into the formwork and allowed to harden, forming columns 25c from reinforced concrete with the gantry pile 51 embedded in it. Thereafter, beams and the like of the basement floor 25 are constructed. In this way, after the lower floors have been constructed in the basement floor 25, the construction of the upper floors is repeated, thereby gradually constructing the basement floor 25 from below. Here, when construction of the basement floor portion 25 is completed, the upper end of the platform pile 51 is left protruding upward from the basement floor portion 25.

[0025] Thereafter, the above-ground portion of the building is constructed (step S5) as shown in Fig. 2. First, the top plate 52 of the gantry pile 51 protruding from below and the base plate 32 of the column 31 are integrated using bolts 33 and nuts 34. Then, the work gantry 50 in the area where the building portion is to be constructed is partially dismantled, and the building portion of this area is constructed using construction machines 60 mounted on the surrounding work gantry 50. In this way, the columns 31 and beams 35 of the above-ground structure 30 of building B1 are constructed using the construction machines 60 mounted on the work gantry 50. Then, the above-ground structure 30 is constructed by repeating the partial dismantling of the work gantry 50 and the partial construction of the above-ground portion of building B1. As a result, when building B1 is completed, all of the work gantry 50 is removed.

[0026] (Action of this embodiment) The gantry piles 51 that support the work gantry 50 are positioned to be buried in the pillars 25c of the underground structure 20, so that when the pillars 25c are constructed, the gantry piles 51 are buried in the pillars 25c.

[0027] (Effects of this embodiment) (1) In this embodiment, the gantry piles 51 that support the work gantry 50 are embedded in the columns 25c of the underground structure 20 of the building B1. This eliminates the need to cut and remove the gantry piles 51 when constructing the basement floor portion 25, allowing the building B1 to be constructed efficiently.

[0028] (2) In this embodiment, the gantry pile 51 is provided at a position where it is embedded not only in the column 25c but also in the pile 21. As a result, even if the hard ground G2 is located deep, by embedding the lower end of the gantry pile 51 in the upper part of the pile 21, the gantry pile 51 can be made short and can be firmly supported.

[0029] (3) In this embodiment, the base plate 32 fixed to the lower end of the column 31 of the above-ground structure 30 is integrally fixed to the top plate 52 fixed to the upper end of the gantry pile 51. This allows the gantry pile 51 to function as an anchor, so that the column 31 can be firmly fixed to the underground structure 20.

[0030] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the gantry pile 51 is positioned so as to be embedded in the pile 21 and the column 25c of the basement floor portion 25. As long as the gantry pile 51 can be embedded in the column 25c, the pile 21 and the basement floor portion 25 may not be aligned in a straight line but may be offset. In this case, the gantry pile does not necessarily have to be embedded in the pile 21. In this case, for example, after forming a foundation framework that will be the lowest position where the columns of the basement floor will be constructed, the gantry pile may be provided on this foundation framework at a position where it will be embedded in the columns of the basement floor that will be constructed later.

[0031] In the above embodiment, the lower part of the gantry pile 51 is buried in the upper part of the pile 21. If the hard ground G2 is shallow, the gantry pile may be supported directly on the hard ground G2. Even in this case, by burying the gantry pile in a column in the basement floor, there is no need to remove the gantry pile or to repair the basement floor after the removal.

[0032] In the above embodiment, the gantry piles 51 embedded in the columns 25c of the basement floor portion 25 are integrated with the steel-framed columns 31 of the above-ground structure 30 of building B1. The columns of the above-ground structure of the building do not have to be made of steel. For example, the above-ground structure of the building may be made of reinforced concrete (SRC) with embedded steel members. In this case, by fixing the steel members embedded in the columns of the above-ground structure to the gantry piles, the columns of the above-ground structure can be firmly fixed to the underground structure.

[0033] In the above embodiment, the top plate 52 of the gantry pile 51 and the base plate 32 of the column 31 of the above-ground structure 30 are integrated (fixed) together using bolts 33 and nuts 34. The configuration for fixing the gantry pile 51 to the column 31 of the above-ground structure 30 is not limited to a configuration in which the plates (52, 32) are fixed in contact with each other. For example, the column 31 may be fixed to the gantry pile 51 with a space provided between the gantry pile 51 and the column 31 of the above-ground structure 30.

[0034] Specifically, as shown in FIG. 5 , a plurality of anchor bolts 71 are provided between the top plate 52 of the gantry pile 51 and the base plate 32. The anchor bolts 71 are arranged near each corner of the plates (52, 32). Both ends of each anchor bolt 71 have a threaded shape, and are fastened with nuts 75, 76 or the like while passing through the plates (52, 32), thereby fastening the plates (52, 32). This eliminates the need to adjust the height of the upper end surface (top plate 52) of the gantry pile 51 and the height of the lower end surface (base plate 32) of the column 31 so that the plates (52, 32) abut against each other. This ensures flexibility in the connection structure between the gantry pile 51 and the column 31.

[0035] In the above embodiment, the basement floor portion 25 is constructed sequentially from the bottom up. However, this is not limited to this, and the basement floor portion may be constructed by a top-down construction method in which the basement floor portion is constructed from the top down within the underground excavation area 15. In the above embodiment, the gantry pile 51 is made of H-shaped steel. However, the gantry pile is not limited to being made of H-shaped steel, and may be made of other steel frame members.

[0036] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) A method for constructing a building as described in claim 1 or 2, characterized in that the gantry pile is installed in a position where it is buried in the pile supporting the building and the column of the underground structure located above the pile, and at least the lower end of the gantry pile is buried in the upper part of the pile.

[0037] (b) A method for installing a platform on which construction machinery used in building construction work is placed, characterized in that a platform pile supporting the platform is provided at a position where it can be embedded in a pillar of an underground structure of the building. [Explanation of symbols]

[0038] B1...building, G1...ground, G2...hard ground, 11...retaining wall, 15...underground excavation area, 20...underground structure, 21...pile, 25...basement floor portion, 25c...column, 30...above-ground structure, 31...column as steel column, 32...base plate, 33...bolt, 34...nut, 35...beam, 50...work platform, 51...platform pile, 52...top plate, 55...joists, 56, 57...joists, 58...covering plate, 60...construction machinery, 71...anchor bolt, 75, 76...nut.

Claims

1. a gantry pile for a gantry on which construction machinery used in the construction of the building is placed is provided at a position where it can be embedded in a pillar of the underground structure of the building; positioning the gantry so as to be supported by the gantry piles; A method for constructing a building, comprising: burying the platform piles in the columns of the underground structure to construct the building.

2. The gantry pile is composed of a steel frame member having a top plate fixed to its upper end, The above-ground structure of the building has a steel column to which a base plate is fixed, The method for constructing a building according to claim 1, characterized in that the above-ground structure is constructed by fixing the top plate and the base plate of the gantry pile.

3. A building having an underground structure, A building characterized in that the gantry piles for the gantry on which construction machinery used in the construction work of the building is placed are buried in the pillars of the underground structure.

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