Rising wall and method of construction thereof

Abstract

To efficiently construct a rising wall on a concrete floor surface.SOLUTION: A post-construction anchor hole 5 is bored at a predetermined position of a concrete floor surface 1a, and an anchor bar 3 is supported and fixed to the post-construction anchor hole 5. A precast concrete wall body 11 having a hollow part 12 penetrating in a height direction is placed on the concrete floor surface 1a so that the anchor bar 3 is positioned in the hollow part 12. The hollow part 12 is filled with concrete 13 to construct a rising wall 10 on the concrete floor surface 1a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rising wall and a method for constructing the same, and more particularly to a rising wall made of concrete that is efficiently constructed on a concrete floor surface and a method for constructing the same. [Background technology]

[0002] In logistics warehouses and other facilities with large floor areas, floor specifications are determined based on the intended use to facilitate the handling of numerous stored items and their transportation within the warehouse. In many cases, the entire concrete floor is finished to a smooth finish using a mechanical trowel such as a trowel. In some cases, concrete rising walls are constructed on top of the concrete floor to divide the warehouse. In this case, multiple reinforcing bars are placed on the concrete floor at the location where the rising walls will be constructed, supporting the floor rebar to serve as anchoring reinforcement for the wall (rising wall). These reinforcing bars are cured to prevent the concrete from adhering to them during the pouring of the floor concrete. After the concrete is poured, the floor surface is smoothed using a trowel or similar tool, and the rising wall is then constructed through a series of processes (laying out the vertical and horizontal reinforcing bars in the wall, installing the formwork, pouring the wall concrete, and removing the formwork).

[0003] In addition, to speed up the construction of concrete floors, rising walls are sometimes made of precast concrete members (precast members). In such cases, the position of the insert bars, the length they protrude from the floor surface, and the inclination of the insert bars are precisely controlled, and the insert bars are inserted into the sleeves of mechanical joints housed within the precast members, and grout is filled between the sleeves and the insert bars to construct the structure.

[0004] In all of the above-mentioned conventional techniques, the multiple reinforcing bars installed in the floor concrete had to be attached to the floor rebars before the floor concrete was poured, so as to ensure a predetermined protrusion length from the concrete floor surface after pouring. To improve the efficiency of the reinforcing bar arrangement work, it is possible to attach the anchoring bars directly to the floor concrete surface using post-installed anchors after the floor concrete has been poured, but the use of post-installed anchors has traditionally been limited to applications such as connecting an existing reinforced concrete main structure to earthquake-resistant reinforcing structural members that reinforce it (Patent Document 1).

[0005] Patent Document 1 discloses an invention in which, when adding an earthquake-resistant reinforced structural wall to an opening defined by the columns and beams of an existing reinforced concrete building, multiple post-installed anchor bars are attached to the columns and beams surrounding the opening, and these anchor bars support the earthquake-resistant reinforced wall. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-221331 Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned method of constructing a rising wall, when the floor concrete is poured, the reinforcement bars protrude from the concrete floor surface, and in the process of leveling the concrete floor, it is not possible to use a trowel or other machine to level it, so it is necessary to level it in parts by hand, which reduces workability and makes the surface prone to unevenness.In addition, the large number of reinforcement bars protruding from the floor surface is dangerous as it can cause tripping and bumping during work.

[0008] Using precast members to join the rising walls with mechanical joints streamlines the work, but the situation remains the same: the reinforcing bars protrude from the floor surface. Also, because the mechanical joints of factory-fabricated precast members are precisely installed on the bottom surface of the precast members, the reinforcing bars installed on the floor concrete side must be installed with precision in terms of position, length, and angle.

[0009] Furthermore, in terms of using post-installed anchors, if it can be confirmed that sufficient anchor strength can be obtained, it is considered preferable to actively utilize post-installed anchors and precast concrete structures in the construction of various new structures in order to improve workability and ensure operational safety.

[0010] SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional techniques described above and to provide a rising wall that can be efficiently constructed on a concrete floor. [Means for solving the problem]

[0011] The present invention is a rising wall constructed at a predetermined position on a reinforced concrete floor surface, characterized in that the rising wall is made up of a precast concrete wall body having a hollow portion penetrating in the vertical direction, which is erected on the reinforced concrete floor surface with anchor bars supported on the reinforced concrete floor by post-installed anchors positioned within the hollow portion, and the hollow portion is filled with concrete.

[0012] The post-installed anchors are preferably provided at positions that avoid the positions of floor reinforcing bars in the reinforced concrete floor.

[0013] It is preferable that the precast concrete wall body has a plurality of hollow portions formed therein.

[0014] The precast concrete wall preferably comprises a thin plate frame that forms the outer shell of the rising wall.

[0015] It is preferable that a plurality of anchor reinforcements are arranged within the hollow portion.

[0016] The anchor bars are preferably deformed steel bars with a nominal diameter of D10 to D16.

[0017] The present invention is a method for constructing a rising wall, which is characterized by drilling post-installed anchor holes at predetermined positions in a reinforced concrete floor surface 1a, supporting and fixing anchor bars in the post-installed anchor holes, placing a precast concrete wall body having a hollow portion penetrating in the height direction on the reinforced concrete floor surface 1a so that the anchor bars are positioned within the hollow portion, and filling the hollow portion with concrete to construct a wall on the reinforced concrete floor surface.

[0018] It is preferable that the post-installed anchor holes are drilled to avoid the positions of the floor reinforcing bars in the reinforced concrete floor. [Effects of the Invention]

[0019] According to the present invention, the workability of a concrete floor is improved, and a rising wall can be efficiently constructed on the concrete floor surface. [Brief explanation of the drawings]

[0020] [Figure 1] 1(a) and 1(b) are a perspective view and a partial cross-sectional view taken along line Ib-Ib in FIG. 1(a), showing an embodiment of a rising wall of the present invention. [Figure 2] FIG. 2 is a plan view of a concrete floor showing the relationship between the post-installed anchors in FIG. 1 and the rising wall position. [Figure 3] 2A and 2B are plan and front views showing one form of precast concrete wall used in the rising wall shown in FIG. 1. [Figure 4] 4(a) is a schematic diagram illustrating the concrete and reinforcement of the concrete floor slab on which the rising wall shown in FIG. 1 is constructed, and a partial cross-sectional view taken along line IVb-IVb in FIG. 4(a). [Figure 5]An explanatory diagram showing the state after holes for post-installed anchors have been drilled into the concrete floor slab shown in Figure 4, and a partial cross-sectional view along line Vb-Vb in Figure 5(a). [Figure 6] An explanatory diagram showing the state in which anchor bars for fixing the wall are attached as post-installed anchors to the concrete floor slab shown in Figure 5 and the precast concrete wall (Figure 2) is installed, and a partial cross-sectional view along line VIb-VIb in Figure 6(a). [Figure 7] An explanatory diagram showing the state in which concrete is being poured into the hollow space of a precast concrete wall installed on the concrete floor shown in Figure 6, and a partial cross-sectional view taken along line VIIb-VIIb in Figure 7(a). [Figure 8] FIG. 10 is a plan view showing the configuration of a rising wall constructed using a modified precast concrete wall body. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, one embodiment of the configuration of the rising wall 10 of the present invention and a method for constructing the same will be shown and described with reference to the accompanying drawings, FIGS. 1 to 7. FIG. [Example]

[0022] Each figure in FIG. 1 shows the configuration of one embodiment of a rising wall 10 of the present invention and a partial cross section taken along line Ib-Ib in FIG. 1(a). In the present invention, the floor 1 on which the rising wall 10 is constructed is made of a reinforced concrete slab (hereinafter referred to as the concrete floor 1). In this embodiment, the slab thickness of the concrete floor 1 is 180 mm, and floor reinforcing bars 2 are used, each consisting of deformed steel bars (nominal diameter D13) spaced 150 mm apart and arranged in a grid pattern at the top and bottom of the cross section. Note that the floor reinforcing bars 2 can be deformed steel bars with a nominal diameter of approximately D10-16 and spaced 100-150 mm apart, depending on the floor's intended use. The floor surface 1a is finished smooth by mechanical leveling. Furthermore, as shown in FIGS. 1(b) and 2, multiple anchor bars 3 are attached to the concrete floor 1 to support the rising wall 10 (shown by phantom lines in FIG. 2), which will be described later, so as to avoid the grid-like arrangement of the floor reinforcing bars 2.

[0023] The rising wall 10 of this embodiment is configured by placing a precast concrete wall body (hereinafter referred to as precast wall body 11) shown in Figure 3 on a concrete floor 1, and filling the hollow portions 12 of the precast wall body 11 with concrete to integrate it with the concrete floor 1. At this time, to integrate the rising wall 10 with the concrete floor 1, anchor reinforcing bars 3 are arranged using post-installed anchors 4 at predetermined positions on the concrete floor surface 1a. As shown in Figure 3, the drilling positions for installing the post-installed anchors 4 are set with dimensional accuracy such that they do not come into contact with the floor reinforcing bars 2 arranged in a grid pattern, and protrude into the hollow portions 12 provided in the precast member.

[0024] In this embodiment, capsule-type adhesive anchors are used as the post-installed anchors 4, and deformed steel bars with a nominal diameter of D10 are used as the anchor reinforcing bars 3. For the anchor reinforcing bars 3, it is preferable to use deformed steel bars with a nominal diameter of D22 or less, considering the relationship between the drilling depth of the anchor holes 5 and the thickness of the concrete floor 1. Furthermore, when considering the workability and cost-effectiveness of the drilling work, it is preferable to use deformed steel bars with a small diameter of approximately D10 to D16. The drilling depth is set to be 7.5d or more relative to the anchor reinforcing bar diameter d, and to be the floor thickness (slab thickness) - 30 mm.

[0025] The precast wall body 11 of the rising wall 10 is placed at a predetermined position on the concrete floor surface 1a so that each anchor reinforcing bar 3 is positioned in each hollow portion 12, and while it is temporarily fixed, concrete 13 of a predetermined strength is filled into the hollow portions 12, forming the rising wall 10 integrated with the concrete floor 1. At this time, the rising wall 10 can function as a wall structure by arranging the necessary reinforcement inside the precast wall body 11.

[0026] [How to build a rising wall] A method for constructing the above-mentioned rising wall 10 will be described below with reference to FIGS. 4 to 7 along the steps from constructing the concrete floor 1 to completing the rising wall 10. FIG. (Concrete floor construction) As shown in each of Figures 4, the concrete floor 1 on which the rising wall 10 of the present invention is erected employs floor reinforcing bars 2 necessary for floor performance, regardless of whether or not the rising wall 10 is present. In this embodiment, deformed reinforcing bars with a nominal diameter of D13 are arranged in a grid pattern with a spacing of 150 mm as two-tiered reinforcing bars at the top and bottom. Next, floor concrete of the specified concrete strength is poured, and the floor surface is finished. At this time, because only the main column reinforcement bars (not shown) protrude from the concrete floor surface 1a at sufficient intervals, a concrete leveling machine such as a trowel can be used to finish the large area of the floor surface 1a in one go.

[0027] (Drilling holes for post-installed anchors) After the floor concrete has hardened to a predetermined strength, as shown in Figures 2 and 5, the position where the precast wall body 11 of the rising wall 10 will be installed (shown by a virtual line in Figure 2) is marked out, and the position of the floor reinforcing bars 2 in the concrete floor 1 is confirmed using a radar reinforcing bar detector or the like, and the position of the floor reinforcing bars 2 is marked on the floor surface 1a. Then, holes for post-installed anchors 4 are drilled into the concrete surface at positions included in the hollow portions 12 that penetrate vertically through the precast wall body 11, avoiding the locations where the floor reinforcing bars 2 are arranged in a grid pattern. An electric drill or core drill is preferably used for drilling. The diameter of the drilled holes is determined according to the diameter of the anchor reinforcing bars 3.

[0028] (Installation of anchor reinforcement - Installation of precast members) The inside of the anchor hole 5 of the post-installed anchor 4 is cleaned to remove concrete chips and other debris. Then, a specified adhesive is placed in the anchor hole 5, and the anchor reinforcing bar 3 is inserted and fixed in place with the adhesive. Either capsule or injection adhesive can be used, but the anchor reinforcing bar 3 is installed according to the procedure that will achieve the appropriate adhesive effect for each method. As mentioned above, the drilling depth of the post-installed anchor 4 is set to 7.5d or more relative to the anchor reinforcing bar diameter d and to the floor thickness (slab thickness) minus 30mm. Considering the thickness of the concrete floor 1, deformed steel bars with a nominal diameter of D22 or less are used for the anchor reinforcing bar 3. Considering the ease of drilling and cost-effectiveness of the work, it is preferable to use small-diameter deformed steel bars with a nominal diameter of approximately D10 to D16.

[0029] For post-installed anchors 4, rather than using a small number of large-diameter anchor bars 3, increasing the number of small-diameter anchor bars 3 so that the total cross-sectional area of the deformed steel bars is the same reduces the amount of concrete drilled and the amount of adhesive resin used, thereby reducing costs. Furthermore, since the drilling depth is determined by the diameter of the anchor bars 3, small-diameter anchor bars 3 have a lower risk of penetrating the floor. Also, a small drilling diameter is preferable so that the drilling avoids the floor reinforcing bars 2.

[0030] Next, as shown in each of Figures 6, with the anchor bars 3 placed in the concrete floor 1, the precast wall body 11 of the rising wall 10 is placed at the marked position. As shown in each of Figures 3 and 6, the precast wall body 11 has a shape with multiple hollow sections 12 that penetrate in the vertical direction, and the precast wall body 11 is placed on the concrete floor 1 so that the anchor bars 3 on the concrete floor 1 side are located within each hollow section 12.

[0031] (Completion of the rising wall) To complete the rising wall 10, concrete 13 is filled into the hollow portion 12 of the precast wall 11 placed on the concrete floor 1a (see Figure 7). Because the precast wall 11 is a relatively heavy component, there is little risk of it shifting position when the concrete 13 is filled into the hollow portion 12. However, it is also preferable to temporarily fix the precast wall 11 to the concrete floor 1a. If a gap occurs between the precast wall 11 and the concrete floor 1a, it is preferable to adjust the gap by inserting a liner plate or the like to keep the precast wall 11 upright, or to apply mortar or mortar as needed. After filling the hollow portion 12 with concrete 13, the top surface of the concrete 13 is leveled with a trowel. After a predetermined curing period, the rising wall 10 is completed.

[0032] [Modifications of precast wall structures] In the above description, the precast wall 11 shown in each of Figures 3 is used to construct the rising wall 10. In contrast, Figure 8 shows a plan view of a modified precast wall 11. The precast wall 11 shown in Figure 8 has four side panels 11a formed in a frame shape using thin concrete plates. This precast wall 11 functions as a formwork for concrete 13 poured into the internal space (corresponding to the hollow portion 12) surrounded by the side panels 11a, and after the concrete 13 in the internal space hardens, it integrates with the concrete 13 to form the outer shell component of the rising wall 10. When using this precast wall 11, it is preferable to use a lattice-shaped wall reinforcement 15 using the anchor reinforcement 3 in addition to the anchor reinforcement 3. This ensures the structural strength of the concrete 13 poured in the internal space of the precast wall 11. The frame-shaped wall that serves as the outer shell component described above can be made of concrete plates, as well as synthetic resin plates, metal plates, ceramic plates, antiseptic-treated wooden boards, or other wall materials suitable for the intended purpose.

[0033] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. In other words, embodiments obtained by combining technical means modified appropriately within the scope of the claims are also included in the technical scope of the present invention. [Explanation of symbols]

[0034] 1 Concrete floor (reinforced concrete floor) 1a Concrete floor 2 Floor reinforcement 3 Anchor bars 4 Post-installed anchors 5 anchor holes 10. Rising Wall 11 Precast concrete wall (precast wall) 12 Hollow part 13 Concrete

Claims

1. A rising wall constructed at a predetermined position on a reinforced concrete floor surface, The rising wall is characterized in that it is a precast concrete wall body having a hollow portion penetrating in the vertical direction, which is erected on the reinforced concrete floor surface with anchor bars supported on the reinforced concrete floor by post-installed anchors positioned within the hollow portion, and the hollow portion is filled with concrete.

2. 2. The raised wall according to claim 1, wherein the post-installed anchors are provided at positions that avoid floor reinforcing bars in the reinforced concrete floor.

3. The precast concrete wall according to claim 1, wherein the hollow portion is formed at a plurality of locations.

4. 2. The rising wall according to claim 1, wherein the precast concrete wall body is made of a thin plate frame body that forms an outer shell of the rising wall.

5. The rising wall according to claim 1 , wherein a plurality of the anchor reinforcements are arranged in the hollow portion.

6. The rising wall according to claim 1, wherein the anchor reinforcement is a deformed steel bar having a nominal diameter of D10 to D16.

7. A method for constructing a raised wall, comprising drilling post-installed anchor holes at predetermined positions on a reinforced concrete floor surface, supporting and fixing anchor bars in the post-installed anchor holes, placing a precast concrete wall having a hollow portion penetrating in the height direction on the reinforced concrete floor surface so that the anchor bars are positioned within the hollow portion, and filling the hollow portion with concrete to construct a wall on the reinforced concrete floor surface.

8. The method for constructing a standing wall according to claim 7, wherein the post-installed anchor holes are drilled to avoid positions of floor reinforcing bars in the reinforced concrete floor.

Images