Reinforcement spacer

Abstract

To provide a spacer for bar arrangement allowing its cover thickness to be secured and its positioning to be easily carried out.SOLUTION: A spacer for bar arrangement used upon forming concrete skin used in a terre armee method is provided with: a body in a plate-like shape; a bar arrangement holding part arranged on an upper part of the body to hold the bar arrangement; and a connective insertion hole arranged on a lower part of the body, to which a connective is inserted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforcing bar spacer used when forming a concrete skin used in the Terre Armee method. [Background technology]

[0002] The Terre Armée method is known as a construction method for supporting the load of embankments and preventing slope collapse. The Terre Armée method involves installing a concrete skin on the front of the embankment, and connecting a metal band called a strip to the connective that protrudes from the back of the concrete skin.The strip is then extended over the embankment, and the embankment is laid on top of this strip, so that the load of the embankment acts on the strip, which functions as an anchor, fixing the concrete skin connected to this strip and supporting the load of the embankment (see Patent Document 1, Figure 10).

[0003] The concrete skin used in the Terre Armée method is formed by pouring and hardening concrete into a formwork that contains reinforcement inside. The reinforcement is arranged by using donut-shaped spacers (see Patent Document 2), which have been widely used in the past, on the surface side of the concrete skin to maintain the cover thickness from the concrete skin surface. Meanwhile, the connective is placed inside the formwork while being suspended by a separate hanging frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-108701 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-54565 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional concrete skins have double reinforcement in the thickness direction. When using a single layer of reinforcement to reduce the amount of rebar and the weight of the concrete skin, the cover thickness becomes large. In this case, if a conventional doughnut-shaped spacer is used, the following problems arise: (1) With conventional donut-shaped spacers, the spacer must be made larger to increase the cover thickness, which reduces the quality of the concrete skin. (2) Conventional donut-shaped spacers are exposed on the surface of the concrete skin after demolding, which may cause cracks in the concrete skin due to freeze-thaw cycles. (3) The connectives fixed to the hanging frame and the reinforcement held in place by the spacers are separate, so each needs to be positioned. (4) In the case of concrete skins with a textured surface design, it is not possible to ensure sufficient cover thickness using spacers on the surface side.

[0006] An object of the present invention is to provide a reinforcement spacer that can ensure a sufficient covering thickness and can be easily positioned. [Means for solving the problem]

[0007] The reinforcing bar spacer of the present invention comprises a flat plate-shaped main body, a reinforcing bar holding portion provided on the upper part of the main body to hold the reinforcing bar, and a connective insertion hole provided on the lower part of the main body to insert a connective. The reinforcement holding portion consists of a first holding claw located in the lateral center of the main body and a second holding claw located on both sides of the first holding claw, and the first holding claw and the second holding claw are each approximately semicircular, one forming an arc on the front side of the main body and the other on the rear side of the main body. The main body may be partially opened to provide a notch. [Effects of the Invention]

[0008] With the above-described configuration, the present invention has at least one of the following effects. (1) By installing a reinforcing bar spacer on the connective fixed to the hanging frame, the cover thickness can be ensured. (2) Large spacers are not required, and the quality of the concrete skin is not compromised. (3) Unlike conventional doughnut-shaped spacers, they are not exposed on the surface of the concrete skin after removal from the formwork, which means there is no risk of cracks in the concrete skin due to freezing and thawing of the exposed parts. (4) The connective fixed to the hanging frame and the reinforcement are integrated, making positioning easy. (5) Since no spacers are required on the surface side, it can also be used for concrete skins with textured designs on the surface. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a reinforcing bar spacer according to the present invention; [Figure 2] An explanatory diagram of the use of the reinforcing bar spacer of the present invention (1) [Figure 3] An explanatory diagram of the use of the reinforcing bar spacer of the present invention (2) DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the reinforcing bar spacer of the present invention will be described in detail with reference to the drawings. [Example]

[0011] <1> Structure of reinforcement spacer The reinforcing bar spacer of the present invention comprises a main body 1, a reinforcing bar holding portion 2 provided on the upper part of the main body 1, and a connective insertion hole 3 provided on the lower part of the main body 1. The reinforcing bar spacer of the present invention is made of resin such as polypropylene (PP), recycled polypropylene (PP), or polyethylene (PE).

[0012] <2> Main unit The main body 1 is a flat plate that is roughly trapezoidal in plan view, and is configured with a hole in one part as a cutout portion 11. Providing the cutout portion 11 makes it possible to reduce the amount of resin used during manufacturing, and also, the concrete that forms the concrete skin fills the cutout portion 11 and hardens, forming a strong, integrated structure.

[0013] <3> Reinforcement holding part The reinforcement retaining portion 2 protrudes upward from the top of the main body 1 and consists of a first retaining claw 21 located in the center in the horizontal direction and second retaining claws 22 located on both sides of the first retaining claw 21. The first holding claw 21 and the second holding claw 22 are each substantially semicircular, with one forming an arc on the front side of the main body 1 and the other on the rear side of the main body 1 .

[0014] <4> Connective insertion hole The connective insertion hole 3 is a horizontally elongated hole that penetrates the lower part of the main body 1 in the front-rear direction. Two protrusions 31 are formed at a predetermined interval on the inner bottom surface of the connective insertion hole 3.

[0015] <5> Usage status The reinforcing bar spacer of the present invention holds the reinforcing bars 4 with the upper reinforcing bar holding portion 2. At this time, the connective 5 is inserted into the connective insertion hole 3 and is left as one piece with the connective 5. Because the connective insertion hole 3 has a ridge 31 inside, there is less interference between the connective 5 and the connective insertion hole 3, making it easier to insert the connective 5. In addition, the ridge 31 prevents rattling of the connective 5 in the perpendicular and vertical directions after insertion. The reinforcement holding portion 2 holds one side of the reinforcement 4 with a first holding claw 21 and holds the other side of the reinforcement 4 with a second holding claw 22. By holding both sides of the reinforcing bars 4 with one first holding claw 21 and two second holding claws 22, the reinforcing bars 4 do not shift vertically or horizontally, especially when pouring concrete or vibrating the formwork 6. This eliminates the need for cap spacers, resulting in cost reduction.

[0016] The concrete skin is formed by pouring and hardening concrete into the formwork 6. At this time, the connective 5 is fixed to the suspension frame 7 via fixing devices 71 such as bolts. The reinforcing bar spacer of the present invention has its lower part fixed to the connective 5 and its upper reinforcing bar holding part 2 holding the reinforcing bar 4, thereby ensuring the covering thickness of the reinforcing bar 4 from the formwork 6. Since the connective 5 fixed to the hanging frame 7 and the reinforcing bar 4 are integrated, positioning is easy. The reinforcing bar spacer of the present invention is fixed to the connective 5 to hold the reinforcing bar 4, so there is no need for a large spacer to ensure a large cover thickness, and the quality of the concrete skin is not compromised. In addition, it is not exposed on the surface of the concrete skin, so there is no risk of cracks in the concrete skin due to freezing and thawing of the exposed parts. Furthermore, because there is no need for spacers on the surface side, it can also be used for concrete skins with uneven designs on the surface. Since the reinforcing bar spacer of the present invention is made of resin, the reinforcing bar 4 and the connective 5 are electrically insulated, preventing corrosion of the connective 5 and the strips connected thereto. [Explanation of symbols]

[0017] 1 Main unit 2 Reinforcement holding part, 21 First holding claw, 22 Second holding claw 3 connecting holes, 31 ridges 4 Reinforcement 5 Connective 6. Formwork 7 Hanging frame, 71 Fixtures

Claims

1. A flat body, A reinforcement holding portion provided on the upper portion of the main body to hold reinforcement; A connective insertion hole is provided at the bottom of the main body and into which the connective is inserted. Reinforcement spacer.

2. The reinforcement holding portion is The device comprises a first holding claw provided at the center of the body in the lateral direction, and a second holding claw provided on both sides of the first holding claw, The first holding claw and the second holding claw are each substantially semicircular, one of which forms an arc on the front side of the main body and the other on the rear side of the main body. The reinforcing bar spacer according to claim 1 .

3. The main body is characterized in that a part thereof is opened to provide a notch. The reinforcing bar spacer according to claim 1 or 2.

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