Horizontal construction joint part reinforcing structure

Abstract

To provide a horizontal construction joint part reinforcing structure in which a position of a reinforcing member is hardly displaced.SOLUTION: A horizontal construction joint part reinforcing structure includes: reinforcement concrete 12 having a horizontal construction joint part side 12A; a holding member 20 erected from a lower face of the reinforcement concrete 12 and holding reinforcements 14 arranged in the reinforcement concrete 12; and a reinforcing member 30 arranged over a vertical direction of the horizontal construction joint part side 12A in a state of being fixed to the holding member 20 and bearing shearing stress generated in the horizontal construction joint part side 12A.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a horizontal joint reinforcement structure. [Background technology]

[0002] Patent Document 1 listed below discloses a concrete joint reinforcement structure for improving the shear strength of a horizontal joint surface between a lower concrete and an upper concrete joint placed above the lower concrete. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-180352 Summary of the Invention [Problem to be solved by the invention]

[0004] In the concrete joint reinforcement structure shown in Patent Document 1, the upper part of the hoop reinforcement (reinforcing member) embedded in the concrete below is held in a protruding state from the concrete below by an air bag. In this configuration, the reinforcing member is difficult to stabilize, and if it becomes misaligned, there is a possibility that sufficient shear strength will not be obtained.

[0005] The present invention takes into consideration the above facts and provides a horizontal joint reinforcement structure in which the position of the reinforcing member is less likely to shift. The purpose is to: [Means for solving the problem]

[0006] The horizontal joint reinforcement structure of claim 1 comprises reinforced concrete having a horizontal joint, a retaining member erected from the underside of the reinforced concrete and holding the reinforcing bars to be arranged in the reinforced concrete, and a reinforcing member fixed to the retaining member and positioned across the horizontal joint in the vertical direction, and bearing the shear stress generated in the horizontal joint.

[0007] In the horizontal joint reinforcement structure of claim 1, the reinforcing member is fixed to a retaining member that holds the reinforcing bar in a predetermined position when pouring concrete. This makes construction easier than a structure that requires a separate positioning member for the reinforcing member, and the reinforcing member is less likely to shift position when pouring concrete.

[0008] Furthermore, this reinforcing member is positioned across the horizontal joint in the vertical direction, and can bear the shear stress that occurs in the horizontal joint in the same way as conventional reinforcing members.

[0009] The horizontal joint reinforcement structure of claim 2 is the horizontal joint reinforcement structure of claim 1, in which the reinforcing member includes a steel member whose longitudinal direction is vertical, and a support plate that follows the horizontal plane and is fixed to the steel member above and below the horizontal joint.

[0010] When the upper and lower reinforced concrete sections in a horizontal joint are displaced relative to each other, gaps form on the joint surface. As a result, tensile forces act on the reinforcing members that straddle the joint surface. In the horizontal joint reinforcement structure of claim 2, the bearing pressure generated between the bearing plate and the concrete can resist the tensile forces acting on the reinforcing members.

[0011] The horizontal joint reinforcement structure of claim 3 is the horizontal joint reinforcement structure of claim 1, wherein the reinforcing member has a longitudinal direction that is vertical and is composed of steel material with through holes formed above and below the horizontal joint.

[0012] In the horizontal joint reinforcement structure of claim 3, concrete is filled into the through-hole, so that the tensile force can be resisted by the bearing pressure generated between the hole wall of the through-hole and the concrete. [Effects of the Invention]

[0013] According to the present invention, the reinforcing member is less likely to become misaligned. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an elevation view partially showing a building to which a horizontal joint reinforcement structure according to an embodiment of the present invention is applied. [Figure 2] 1A is an elevation view showing a horizontal joint reinforcement structure according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB of FIG. 1A. [Figure 3] 1 is a perspective view partially illustrating a horizontal joint reinforcement structure according to an embodiment of the present invention. FIG. [Figure 4] FIG. 1 is an elevation view showing a state in which gaps have occurred in a horizontal joint in a horizontal joint reinforcement structure according to an embodiment of the present invention. [Figure 5] (A) is an elevational view showing a modified example of a horizontal joint reinforcement structure according to an embodiment of the present invention, (B) is a cross-sectional view of (A) along line BB, and (C) is a cross-sectional view of (A) along line CC. [Figure 6] 1A is an elevation view showing another modified example of a horizontal joint reinforcement structure according to an embodiment of the present invention, and FIG. 1B is an elevation view showing yet another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a horizontal joint reinforcement structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0016] Furthermore, descriptions of overlapping configurations and symbols in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations, replacing them with different configurations, or combining one embodiment with various modified examples, within the scope of the purpose of the present disclosure.

[0017] <Horizontal joint reinforcement structure> 1 partially shows a building 10 to which a horizontal joint reinforcement structure according to an embodiment of the present invention is applied. The horizontal joint reinforcement structure is applied to a portion where a horizontal joint 12A is formed in a pressure plate provided at the bottom of the building 10, or in a reinforced concrete 12 such as a mat slab or foundation beam with a large cross section.

[0018] As shown in FIG. 2(A), the horizontal joint reinforcement structure includes reinforced concrete 12 having a horizontal joint 12A, a retaining member 20, and a reinforcing member 30.

[0019] In the reinforced concrete 12, a horizontal joint 12A is formed in a portion where concrete was poured over several days.

[0020] Furthermore, reinforcing bars 14 are arranged in the reinforced concrete 12. The reinforcing bars 14 are laid before the concrete is poured. The reinforcing bars 14 (for example, upper end reinforcing bars) arranged above the horizontal joint 12A are also laid before the concrete is poured.

[0021] (holding member) The holding members 20 are jigs for holding the reinforcing bars 14 at a predetermined height, and multiple holding members 20 are installed on the concrete pouring surface (upper surface of the formwork) at intervals necessary to hold the reinforcing bars 14. The holding members 20 are configured to include a lower member 20A and an upper member 20B.

[0022] The lower member 20A is a steel angle member with its lower end fixed to the base plate 22 and with a reinforcing member 30 welded to its upper end. On the other hand, the upper member 20B is a steel angle member with a reinforcing bar holding portion 24 fixed to its upper end and with a reinforcing member 30 welded to its lower end.

[0023] That is, the lower member 20A is welded to the lower end of the reinforcing member 30, and the upper member 20B is welded to the upper end of this reinforcing member 30, thereby holding the reinforcing bar holding portion 24 at a predetermined height. This allows the reinforcing bar 14 placed on the reinforcing bar holding portion 24 to be held at a predetermined height.

[0024] As shown in Figure 2, the reinforcing bars 16 are placed on the reinforcing bar holding parts 24, and the reinforcing bars 14 are placed on the reinforcing bars 16. In the present invention, "reinforcing bars arranged in reinforced concrete" includes not only slab bars but also various types of reinforcing bars such as reinforcing bars.

[0025] In this embodiment, the holding member 20 is formed by dividing it into the lower member 20A and the upper member 20B, but the embodiment of the present invention is not limited to this. For example, the lower member 20A and the upper member 20B may be formed integrally.

[0026] That is, the "retaining member erected from the underside of reinforced concrete and holding reinforcing bars arranged in the reinforced concrete" in the present invention includes at least the following two aspects.

[0027] One embodiment is a holding member 20 in which the lower member 20A and the upper member 20B are separated as described above, and each is capable of holding the reinforcing bar 14 while being fixed to the reinforcing member 30. Another embodiment is a holding member in which the lower member 20A and the upper member 20B are integrated, and can hold the reinforcing bar 14 alone (without the reinforcing member 30).

[0028] (reinforcing member) 2(B) and 3, the reinforcing member 30 is configured to include steel members 32, which are angle members. The steel members 32 are arranged with their longitudinal direction aligned vertically.

[0029] The steel material 32 is fixed to the retaining member 20 (both the lower member 20A and the upper member 20B) and is arranged to straddle the horizontal joint 12A in the vertical direction, and bears the shear stress generated in the horizontal joint 12A.

[0030] Furthermore, bearing plates 34 that run along the horizontal surface are fixed to the steel material 32 above and below the horizontal joint 12A. The bearing plates 34 are fixed to both flanges of the steel material 32.

[0031] In the support plate 34, a notch is formed in a portion that is located at the inside corner of both flanges that form the steel material 32. As a result, a through hole 34H is formed between the support plate 34 and the steel material 32.

[0032] By providing this through hole 34H, concrete can flow through this through hole 34H when pouring, and air pockets are less likely to form between the bearing plate 34 and the steel material 32.

[0033] Furthermore, ribs 36 extending in the vertical direction (i.e., the longitudinal direction of the steel material 32) are welded to the support plate 34. The ribs 36 are also welded to the steel material 32.

[0034] <Installation procedure> To form the horizontal joint reinforcement structure described above, first, a spacer S is placed on the pouring surface where reinforced concrete 12 will be poured. Then, a retaining member 20 with a reinforcing member 30 fixed thereto is placed on the pouring surface. Then, reinforcing bars 14 are laid.

[0035] When laying reinforcing bars 14 other than the upper and lower end bars, the reinforcing bars 14 can be arranged at the desired height by using spacers S of different heights, lower members 20A and upper members 20B of different lengths, and reinforcing members 30 of different lengths.

[0036] Next, concrete is poured. The height of the first concrete pour is not particularly limited, but it should be at least at a position sandwiched between the upper and lower support plates 34. Preferably, it should be at the center position of the upper and lower support plates 34.

[0037] Next, a second layer of concrete is poured over the next day (or after a certain time has elapsed). The second layer of concrete is poured so that all of the reinforcing bars 14 are embedded. This forms a horizontal joint reinforcement structure in which reinforcing members 30 are arranged across the horizontal joint 12A in the vertical direction.

[0038] <Action and effect> In the horizontal joint reinforcement structure according to the embodiment of the present invention, the reinforcing member 30 is fixed to the retaining member 20, which holds the reinforcing bar 14 in a predetermined position when pouring concrete. This makes construction easier than a structure in which a separate positioning member for the reinforcing member 30 is provided, and the position of the reinforcing member 30 is less likely to shift when pouring concrete.

[0039] Note that "a configuration in which a positioning member for the reinforcing member 30 is separately provided" is a configuration in which the reinforcing member 30 is not fixed to a holding member (holding member 20 or other holding member) that holds the reinforcing bar 14 in a predetermined position, but rather the reinforcing member 30 is held in a predetermined position by some member other than the holding member.

[0040] Furthermore, this reinforcing member 30 is disposed across the horizontal joint 12A in the vertical direction, and can bear the shear stress occurring in the horizontal joint 12A in the same way as conventional reinforcing members.

[0041] 4, when a horizontal force acts on the reinforced concrete 12 during an earthquake or the like, causing the upper and lower reinforced concrete pieces 12 at the horizontal joint 12A to shift relative to each other and deform, gaps form at the joint surface. As a result, a tensile force acts on the reinforcing member 30 that straddles the joint surface. In the horizontal joint reinforcement structure according to the embodiment of the present invention, the bearing pressure generated between the bearing plate 34 of the reinforcing member 30 and the concrete can resist the tensile force acting on the reinforcing member 30.

[0042] In addition, a compressive stress σ occurs at the joint surface of the horizontal joint 12A as a reaction force to the tensile force acting on the reinforcing member 30. Therefore, the shear force that can be transmitted in this horizontal joint reinforcement structure is the compressive stress σ acting on the joint surface multiplied by a friction coefficient μ depending on the condition of the joint surface. Furthermore, when an axial force acts on the joint surface, the axial stress can be added to the compressive stress.

[0043] Specifically, the shear strength per unit area is τ u [N / mm 2], the cross-sectional area of ​​the reinforcing member 30 per unit area of ​​the joint surface is p s [mm 2 ], the standard yield point of the reinforcing member 30 is σ y [N / mm 2 ], the normal component of stress per unit area is σ0 [N / mm 2 ](However, σ y is 800 [N / mm 2 ] exceeds 800 [N / mm 2 ]), and the compressive strength of concrete is σ B [N / mm 2 ], the following intensity equation holds:

[0044] τ u =μ(p s σ y +σ0) where τ u <0.3σ B

[0045] <Other embodiments> The reinforcing member of the present invention can be implemented in various forms. For example, as shown in Figures 5(A) to 5(C), a steel material may be used in which the longitudinal direction is vertical and through holes H are formed above and below the horizontal joint 12A. The number of through holes H is not limited to two, and three or more may be provided.

[0046] According to this embodiment, concrete is filled into the through hole H, so that the tensile force can be resisted by the bearing pressure generated between the hole wall of the through hole H and the concrete.

[0047] In addition, the reinforcing member 40 is provided with ribs 44 on the outer periphery of the through hole H, protruding in the axial direction of the through hole H. This makes it possible to increase the bearing pressure. However, such ribs 44 do not necessarily have to be provided.

[0048] 6(A) and 6(B), reinforcing members 50 and 60 may be used as the reinforcing members. Hooks 52 are provided on both ends of the reinforcing member 50 to make it easier to resist tensile forces.

[0049] Furthermore, in the reinforcing member 60, support plates 64 are provided on both ends of the straight reinforcing bars 62 to make it easier to resist tensile forces. Note that in order to avoid interference between the support plates 64 and the lower member 20A and the upper member 20B, protruding members 26 can be provided on the lower member 20A and the upper member 20B. The reinforcing bars 62 are fixed to the protruding members 26 and are held in positions spaced apart from the lower member 20A and the upper member 20B.

[0050] As described above, the present invention is not particularly limited to a specific form of the reinforcing member, and as long as the attachment length L can be sufficiently secured, the reinforcing member is not limited to a reinforcing bar, and for example, a steel material such as an angle may be used without providing the hook 52 or the bearing plate 64. As described above, the present invention can be embodied in various forms. [Explanation of symbols]

[0051] 12 Reinforced concrete 12A Horizontal joint 14 Reinforced concrete 16 Preparation reinforcement (reinforcing bars) 20 Retaining member 30 Reinforcement member 32 Steel materials 34 Bearing plate 40 Reinforcement member 50 Reinforcement member 60 Reinforcement member H through hole

Claims

1. Reinforced concrete having horizontal joints; a holding member that stands upright from the underside of the reinforced concrete and holds reinforcing bars to be arranged in the reinforced concrete; A reinforcing member that is fixed to the retaining member and arranged across the horizontal joint in the vertical direction, and bears the shear stress generated in the horizontal joint; Equipped with Horizontal splice reinforcement structure.

2. The reinforcing member is A steel material with its longitudinal direction in the vertical direction; A bearing plate along a horizontal surface fixed to the steel material above and below the horizontal joint; It is composed of The horizontal joint reinforcement structure according to claim 1.

3. The reinforcing member is The longitudinal direction is vertical, and the horizontal joint portion is configured to include a steel material having a through hole formed above and below the steel material. The horizontal joint reinforcement structure according to claim 1.

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