JP-7857184-B2 - How to construct a structure

Inventors

• デヴィン グナワン
• 曽我部 直樹
• 小林 聖

Assignees

• 鹿島建設株式会社

Dates

Publication Date

20260512

Application Date

20220801

Claims (6)

1. A method for constructing a structure, Step (a) involves fixing a formwork to a reinforcing material embedded in the structure, and filling the inside of the formwork with concrete to form the interior of the structure. (b) A step of forming the outer shell of the structure by applying a hardening agent made of cement-based material to the inner outer surface of the structure, The structure is constructed by, A method for constructing a structure, characterized in that reinforcing bars to be embedded in the outer shell are arranged outside the formwork.
2. The method for constructing a structure according to claim 1, characterized in that the formwork is made of lath mesh, and the lath mesh is left on the outer surface inside the structure.
3. Shear reinforcement bars are embedded inside the aforementioned structure. A method for constructing a structure according to claim 1, characterized in that the lateral pressure during the filling of the concrete is supported by the shear reinforcement bars.
4. The method for constructing a structure according to claim 1, characterized in that the formwork is fixed to the inside of the main reinforcement bars and distribution reinforcement bars, which are reinforcing materials of the structure and embedded in the outer shell .
5. The method for constructing a structure according to claim 1, characterized in that the formwork is fixed using a fixing jig.
6. Shear reinforcement bars are embedded inside the aforementioned structure. The method for constructing a structure according to claim 5, characterized in that a fixing jig for the end of the shear reinforcement bar is used as the fixing jig.

Description

This invention relates to a method for constructing a structure, etc. When constructing concrete structures such as walls, the conventional method involves assembling reinforcing bars, constructing formwork, pouring concrete, and then removing the formwork after curing to a predetermined age. Thus, the construction of concrete structures involves multiple types of work, making the process complex. Furthermore, there has been a shortage of skilled construction workers in recent years, particularly carpenters, and it is anticipated that securing carpenters will become increasingly difficult in the future. Therefore, in recent years, there has been a demand for the development of simpler construction methods. For example, Patent Document 1 discloses a method of constructing a structure by forming the outer shell of a structure using a spray-on cement-based material such as mortar, and then using the outer shell as formwork to pour concrete into its interior. This simplifies the construction of structures by replacing conventional wooden formwork with a spray-on outer shell, thus addressing the shortage of workers. Japanese Patent Publication No. 2021-110156 A diagram showing the construction method of structure 1.A diagram showing wire mesh 3.A diagram showing the fixing jig 5.An example of fixing the lath mesh 3 inside the main reinforcement bars 21 and distribution reinforcement bars 22.A diagram showing the fixing jig 5a.A diagram showing reinforcing bars 4.A diagram showing mesh reinforcement 6 and net 7.An example using small diameter reinforcing bars (8).An example using sheet material 9.An example using separator 10. The following describes preferred embodiments of the present invention in detail with reference to the drawings. Figure 1 is a cross-sectional view showing each step of the construction method for a structure 1 according to an embodiment of the present invention. In this embodiment, a wall-like structure 1 is constructed, and each figure in Figure 1 shows a vertical cross-section in the thickness direction of the structure 1. The thickness direction of the structure 1 corresponds to the left-right direction in each figure. In this embodiment, as shown in Figure 1(a), first, the reinforcing bars 2, which are embedded in the structure 1, are assembled. In this embodiment, the reinforcing bars 2 of the structure 1 consist of main bars 21, distribution bars 22, and shear reinforcement bars 23. The main reinforcement bars 21 are vertical reinforcement bars, and multiple bars are arranged at intervals on both sides of the thickness direction of the structure 1, in the extension direction in the plane of the structure 1 (hereinafter simply referred to as the extension direction). The extension direction of the structure 1 is perpendicular to the thickness direction of the structure 1 in the plane, and corresponds to the plane normal direction in Figure 1. The reinforcement bars 22 are horizontal reinforcing bars, positioned on both sides of the thickness direction of the structure 1, along the extension direction of the structure 1. The reinforcement bars 22 are arranged vertically in multiple layers with spacing between them. The shear reinforcement bars 23 are horizontal reinforcement bars arranged along the thickness direction of the structure 1. The shear reinforcement bars 23 are arranged in multiple vertical rows with spacing between them, and these vertical rows of shear reinforcement bars 23 are arranged in multiple rows with spacing between them in the extension direction of the structure 1. In this embodiment, after the reinforcing bars 2 are positioned, the lath mesh 3 is fixed to the reinforcing bars 2 on both sides in the thickness direction of the structure 1, as shown in Figure 1(b). The lath mesh 3 functions as formwork when the concrete C is filled, as described later. The lath mesh 3 is a mesh-like member with numerous openings (mesh holes). For example, a steel blind metal can be used as the lath mesh 3. Figure 2(a) shows an elevation view of the blind metal, in which hexagonal openings 31 are arranged vertically and horizontally. Furthermore, as shown in Figure 2(b), orienting the openings 31 of the blind metal upwards can suppress leakage of concrete C during filling. The lath mesh 3 can be secured to the outside of the main reinforcement bars 21 or distribution reinforcement bars 22 by tying it with wire or the like. Alternatively, as shown in Figure 3, it is also possible to secure the lath mesh 3 to the outside of the main reinforcement bars 21 or distribution reinforcement bars 22 (distribution reinforcement bars 22 in the example of Figure 3) using a fixing jig 5, allowing for easy and reliable securing of the lath mesh 3. Note that "outside" refers to the external side of the structure 1, while the internal side of the structure 1 is referred to as "inside." The fixing jig 5 in Figure 3 has a configuration in which a male screw 52 is screwed into a female screw hole prov