JP6267495B2 - Crack control reinforcement and reinforced concrete using the same - Google Patents

Description

  The present invention relates to a crack-suppressing reinforcing material embedded in a position near the surface of concrete in order to suppress cracks generated in the concrete, and reinforced concrete using the same.

  In the case of concrete produced by stirring and mixing mainly cement, represented by Portland cement, fine aggregate, coarse aggregate, and water, calcium hydroxide is generated in the process of cement reacting with water. It is known that cracks occur near the surface due to the effects of heat of hydration and self-shrinkage / dry shrinkage in the curing process.

  Conventionally, many reinforcing materials for suppressing cracks in concrete have been proposed. For example, in the following Patent Document 1, it is a crack suppressing material for a hardened cement body, and the crack suppressing material is a combination of a first thread and a second thread having a shorter length than the first thread in a net shape. A crack-suppressing material for a hardened cement body having a net-like body and (tensile stiffness of the first yarn) / (tensile stiffness of the second yarn) of 1.5 to 30 has been proposed.

  Further, in Patent Document 2 below, a concrete reinforcing material embedded near the surface of the concrete, which has a net-like body mainly made of metal wire or non-metallic fiber, and the net-like body is substantially perpendicular to the net-like surface. A large number of convex portions protruding in the distribution are provided, and when the concrete reinforcing material is brought into contact with a mold frame for concrete molding, the convex portions are arranged so that the mesh body is predetermined from the surface of the mold frame. Concrete reinforcements that are separated by a length have been proposed. The net-like body is formed by weaving a yarn in which non-metallic fibers are twisted or a cord-like body in which non-metallic fibers are bundled, and is a three-way line, yarn or string that crosses each other at an angle of approximately 60 °. Is included.

  Furthermore, a welded wire mesh (wire mesh) in which wires made of iron or stainless steel are orthogonally arranged in a lattice shape in the longitudinal direction and the transverse direction and the intersections are electrically resistance welded is also used as a reinforcing material for concrete.

JP 2009-126730 A JP 2001-232624 A

Funato et al., “Crack Width of Reinforced Concrete Members Using Aramid Triaxial Mesh with Sand”, 59th Annual Conference of Japan Society of Civil Engineers (Japan Society of Civil Engineers), September 2004, p649-650

  The crack suppressing material (alkali-resistant glass fiber net) according to Patent Document 1 has excellent tensile rigidity and adhesion to concrete, effectively suppresses excessive cracks, and produces a highly durable concrete cured body. However, since the elastic modulus is only about 1/3 that of iron and about twice that of concrete, the effect of suppressing cracking in concrete is also limited. In addition, it is lightweight and easy to handle, but it is flexible and easily deformed, so it requires labor to fix it to the reinforcing bar. It was necessary to do carefully while paying. Furthermore, there is a problem that the material cost is expensive and the construction cost increases.

  Next, according to Non-Patent Document 1, the concrete reinforcing material (sanded aramid triaxial mesh) according to Patent Document 2 has almost no effect of suppressing the occurrence of cracks, and can only be expected to have an effect of suppressing the crack width. . In addition, since it is flexible and easily deformed, it requires labor to fix it to the reinforcing bar, and it is necessary to carefully perform it while paying sufficient attention to prevent deformation when placing concrete. The problem that the material cost is expensive and the construction cost increases is the same as that of the crack suppressing material according to Patent Document 1.

  Since the welded wire mesh has an elastic coefficient similar to that of a reinforcing bar, it can be expected to have an effect of suppressing the occurrence of cracks and is superior to others in that it is inexpensive. However, the diameter of the wire is 2.6 mm at the minimum, and since this crosses the cross direction, a minimum installation thickness of 5.2 mm is required, which greatly affects the cover. Moreover, there is a problem that the degree of restraint of concrete is weak because the intersection is welded. At present, there are many demands for welded wire mesh for slabs (floor slabs) such as condominiums, offices, warehouses, bridges, and concrete pavers, but for other applications, mainly simple structures are used. In contrast, it is used in a limited way.

  Therefore, the main problem of the present invention is a reinforcing material embedded in the vicinity of the surface of the concrete along the surface to suppress cracks, which reliably resists the tensile stress that causes cracks, and the occurrence of cracks itself. In addition, it has various advantages such as easy fixation to rebar, easy placement of concrete, and low cost, and also contributes greatly to strengthening concrete. Another object of the present invention is to provide a crack suppressing reinforcing material and a reinforced concrete using the same.

In order to solve the above-mentioned problem, the present invention according to claim 1 is a reinforcing material embedded in the vicinity of the surface of the concrete along the surface and for suppressing cracking,
As the material of the steel strip plate longitudinal dimension is formed longer than the width B, and the steel strip plate, a large number of circular holes with a maximum dimension or size of the coarse aggregate to be mixed Are formed in a regular pattern of a multi-row staggered arrangement ,
The thickness of the steel ribbon is 2 mm or less, and the width B of the steel ribbon is a diameter R × number of rows plus a dimension of the connecting width portion A × 2, The diameter R is at least 20 mm or more, the dimension of the connecting width portion A is 2.5 to 10 mm, the dimension C between the holes is 7 to 20 mm, and is a line connecting the center points of three adjacent holes A crack-suppressing reinforcing material is provided which is a continuum of regular hexagonal turtle shell lines .

In the invention described in claim 1, wherein, crack suppression reinforcement as a material of the steel strip plate longitudinal dimension is formed longer than the width, in the steel thin strip, coarse aggregate to be mixed into A large number of circular holes having a size equal to or larger than the maximum diameter of the material are formed in a regular pattern of a plurality of rows in a staggered arrangement . First, since steel strips are used as a material, the cross-sectional area sharing the stress is larger than that of the above-mentioned conventional reinforcing material, and the elastic modulus is the same as that of the reinforcing bar. It is possible to reliably resist the tensile stress that causes cracking and to suppress the occurrence of cracks. In addition, since a thin steel plate is used, the problem of securing the cover is solved, and there are advantages such as easy fixation to a reinforcing bar and the like, easy placement of concrete, and lower cost.

The hole is a circular shape, because it is formed in the size of the largest diameter or more of the coarse aggregate to be mixed, with no inhibiting the flow and arrangement of coarse aggregate of concrete, the concrete is filled in the hole In the hardened state, integrity with concrete can be expected without depending on adhesion. In the hole portion where the concrete is filled, the concrete is constrained by the surrounding thin steel plate, and the crack does not occur in the concrete at this portion. And, it is thought that tensile stress that causes cracking occurs between the hole filled with concrete and the hole, but steel material exists between this hole and the hole (grade part), and the rigidity is high At the same time, since the steel material resists the tensile stress, the occurrence of cracks itself can be suppressed. Furthermore, since the crack-suppressing reinforcing material can resist structurally as a tensile material, if it is placed in a region where tensile stress is generated by bending, it can contribute to strengthening the concrete itself. It becomes.

Thickness before Symbol steel thin strip is 2mm or less, the width B of the steel strip plate is sized to the sum of the dimensions of the connecting width portion A × 2 diameter R × number of columns of holes, said holes The diameter R is at least 20 mm or more, the dimension of the connecting width portion A is 2.5 to 10 mm, the dimension C between the holes is 7 to 20 mm, and connects the center points of three adjacent holes. The line is a continuum of regular hexagonal turtle shell lines.

If 2mm hereinafter the plate thickness of the steel thin strip, it is possible to easily deformed by combined manual and formation of pores, it is also easy to install improved handling properties. Moreover, it can have moderate hardness which does not deform | transform easily at the time of concrete placement.

The hole, the staggered arrangement of the plurality of rows, was connected to the center point of the three adjacent holes lines (hereinafter, the stress dispersion structure lines) Ru Ttei such a continuum of regular hexagonal hexagonal wire. Tensile stress due to self-shrinkage and drying shrinkage, which cause cracks, is expected to occur in any direction, but it is stable by forming a structurally stable turtle shell-shaped stress distribution structure line. Therefore, it is possible to resist the tensile stress in any direction and suppress the occurrence of cracks.

As the present invention according to claim 2, wherein the hole is formed by punching, and processing the punching member to the clip-like, cracking inhibition reinforcing material according to claim 1 Symbol placement used as temporary fasteners for connecting between crack suppression reinforcement Is provided.

In the invention according to the second aspect, as a way of effectively using the remaining material generated by the hole formation, the punched member (remaining material) generated by the punching formation of the hole is processed into a clip shape, and the crack suppressing reinforcing materials are connected to each other. It is used as a temporary fastener.

As a third aspect of the present invention, there is provided a reinforced concrete in which the crack suppressing reinforcing material according to any one of the first and second aspects is embedded along the surface at a position near the surface of the concrete. .

As the present invention according to claim 4 , in the connection portion in which the crack suppressing reinforcing materials are arranged in series, the respective holes located on the end side of two adjacent crack reinforcing materials are overlapped and exist in the hole. 4. The reinforced concrete according to claim 3, wherein the structural continuity is maintained through the concrete.

In order to ensure the structural continuity of the joint part of the crack suppression reinforcing material embedded in the concrete, the invention according to the above-mentioned fourth aspect of the present invention, each of which is located on the end side of two adjacent crack reinforcing materials. The holes are overlapped to maintain structural continuity through the concrete present in the holes.

As the present invention according to claim 5, there is provided the reinforced concrete according to any one of claims 3 and 4 , wherein a ring-shaped reinforcing material or a rod-like fiber is mixed together with the crack suppressing reinforcing material.

As a sixth aspect of the present invention, there is provided the reinforced concrete according to any one of the third and fourth aspects, wherein a ring-shaped reinforcing material and a rod-like fiber are mixed together with the crack suppressing reinforcing material.

The inventions according to claims 5 and 6 include mixing a ring-shaped reinforcing material or a rod-shaped fiber together with the crack-suppressing reinforcing material, or mixing a ring-shaped reinforcing material and a rod-shaped fiber together with the crack-controlling reinforcing material. By doing this, it is noted that a synergistic proof strength enhancement effect that exceeds the combined proof strength appears compared to the case where each is used alone.

  As described above in detail, according to the present invention, the reinforcing material is embedded along the surface in the vicinity of the surface of the concrete and suppresses cracks, and reliably resists the tensile stress that causes cracks. In addition to being able to suppress the occurrence itself, it has various advantages such as easy fixation to rebar, easy placement of concrete, low cost, etc. It is possible to provide a crack-suppressing reinforcing material that can greatly contribute and a reinforced concrete using the same.

The 1 row model 1A of the crack suppression reinforcement 1 is shown, (A) is a front view, (B) is a side view. The three-row model 1B of the crack suppression reinforcement 1 is shown, (A) is a front view, and (B) is a side view. It is a figure for demonstrating the crack suppression mechanism of a crack suppression reinforcement (3 row model 1B). The temporary metal fitting 5 is shown, (A) is a front view and (B) is a side view. The connection point of the crack suppression reinforcing material 1 is shown, (A) is a front view, and (B) is a side view. It is a figure which shows the bending strength test result of the concrete using the crack suppression reinforcement 1 which concerns on this invention. It is a figure which shows the bending strength test result of the concrete using the conventional alkali-resistant glass fiber net. It is a figure which shows the bending strength test result of the concrete using the conventional aramid triaxial mesh with sand. It is a figure which shows the bending strength test result of the various crack suppression reinforcement which concerns on this invention. It is a figure which shows the bending strength test result for verifying the difference between the case where each hole located in the edge part side is overlap | superposed, and the case where it does not overlap in the connection part of crack suppression reinforcements. It is a figure which shows the bending strength test result for verifying the reinforcement effect at the time of using a ring-shaped reinforcement material together. It is a figure which shows the bending test result for verifying the reinforcement effect at the time of using a ring-shaped reinforcement material and a rod-shaped fiber together.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the crack suppressing reinforcing material 1 according to the present invention is a reinforcing material that is embedded along the surface in the vicinity of the surface of the concrete to suppress cracking, and has a width dimension. On the other hand, the steel ribbon 2 having a long longitudinal dimension is used as a raw material, and the steel ribbon 2 is polygonal, circular, or elliptical or larger than the maximum diameter of the coarse aggregate to be mixed. A large number of holes 3, 3... Are formed in a regular pattern of one or more rows. The thickness t of the steel ribbon 2 is 2 mm or less, preferably 1.6 mm or less, more preferably 0.8 to 1.2 mm.

  The details will be described below.

First, the example shown in FIG. 1 is an example of a one-row model 1A of the crack suppression reinforcing material 1 according to the present invention. The width dimension B of the steel ribbon 1 is a dimension obtained by adding the dimension of the connecting width portion A × 2 to the diameter R of the hole 3. The diameter R of the hole 3 is larger than the maximum dimension of the coarse aggregate used. The maximum size of coarse aggregate is defined by the Standard Specification for Concrete (Japan Society of Civil Engineers) as 1/5 of the minimum member size or 3/4 of the minimum perforation of the reinforcing bar and 3/4 of the cover. In general, it is set to 20 mm or 25 mm, and when the cross-sectional dimension is large, 40 mm is standard. Accordingly, the diameter R of the hole 3 is at least 20 mm, preferably 30 to 45 mm. The dimensions of the consolidated width part A, 2.5~10mm, preferably is a preferably about 5 to 7 mm, the dimension C between the hole 3 and the hole 3, 7~20mm, preferably 10~15mm It is said.

  The shape of the hole 3 is hexagonal or more polygonal, circular or elliptical. The diameter R in the case of a polygonal shape is the dimension of the minimum inner diameter. In the case of a polygonal shape, it is preferably an octagon or more, and most preferably a circular or elliptical shape. The hole 3 is formed by punching with a press.

Next, the example shown in FIG. 2 is an example of a three-row model 1B of the crack suppression reinforcing material 1 according to the present invention. The width dimension B of the steel ribbon 1 is a dimension obtained by adding the dimension of the connecting width portion A × 2 to the diameter R × 3 of the hole 3. The diameter R of the hole 3 is the same as the one-line model 1A in that the diameter R is larger than the maximum size of the coarse aggregate to be used, and is generally 20 mm or 25 mm. 40 mm. Accordingly, the diameter R of the hole 3 is at least 20 mm, preferably 30 to 45 mm. The dimensions of the consolidated width part A, 2.5~10mm, preferably is a preferably about 5 to 7 mm, the dimension C between the hole 3 and the hole 3, 7~20mm, preferably 10~15mm It is said. The shape of the holes 3 is the same as that of the one-line model 1A. In the case of a multi-row model, the holes 3, 3,... Are arranged in a staggered manner.

  In the present embodiment, the one-row model 1A and the three-row model 1B have been described, but the same applies to the two-row model and the four-row model or more. In short, the number of suitable rows (width B of the reinforcing material 1) is determined according to the size of the concrete and the installation location.

  The effect of the present reinforcing material 1 will be described by taking the above three-row model 1B as an example. As shown in FIG. 3, in the hardened state in which the holes 3, 3,. Unity can be expected. In the three holes filled with concrete, the concrete is constrained by the surrounding thin steel plate, and no cracks occur in the concrete at this part. And it is thought that the tensile stress which causes a crack generate | occur | produces between the hole 3 and the hole 3 with which concrete was filled, but steel materials exist between this hole 3 and the hole 3 (score part P). However, since the steel material is resistant to tensile stress as well as having high rigidity, the occurrence of cracks itself can be suppressed. Furthermore, since the crack-suppressing reinforcing material 1 can resist structurally as a tensile material, if it is arranged in a region where a tensile stress is generated by bending, it can contribute to an increase in strength of the concrete itself. It will be a thing.

  In particular, in the case of the multi-row model crack suppression reinforcing material 1B, as shown in FIG. 3, a line connecting the center points of the three adjacent holes 3, 3. It is a continuum of hexagonal turtle shell lines. Tensile stress due to self-shrinkage / dry shrinkage, which causes cracking, is expected to occur in any direction, but by constructing a turtle shell-shaped stress distribution structure line 4 that is structurally stable, It is possible to stably resist tensile stress in any direction and suppress the occurrence of cracks.

  The hole 3 of the crack suppressing reinforcing material 1 is formed by punching, but this punching member (remaining material) is processed into a clip shape as shown in FIG. 4 to connect the crack suppressing reinforcing materials 1 and 1 to each other. It is desirable to use as the temporary fixing metal fitting 5 to be performed. The example shown in FIG. 4 is an example in which the hole 3 is circular, but an arc-shaped cut is made with a part (the connecting portion 5a) inside the outer shape, and the cut piece 5A is formed. As shown in FIG. 4 (B), it is made to stand upright. FIG. 5 shows a connection mode of the one-row model 1A. In the connection portion where the crack suppression reinforcing materials 1A and 1A are arranged in series, the end side of two adjacent crack reinforcing materials 1A and 1A is shown. If the left and right crack restraining reinforcing materials 1A and 1A are connected so that one or a plurality of holes located in each of them are overlapped, or three holes in the illustrated example, the portion between the holes 3 and 3 is It is sandwiched and restrained by the cut piece 5A of the temporary fixing metal 5. The placed concrete enters the hole 3, and the crack-suppressing reinforcing materials 1A and 1A maintain the structural continuity (transmission of acting force) through the concrete.

<Example 1>
The strength performance comparison test of the crack suppression reinforcement material 1 which concerns on this invention, and the conventional reinforcement material was done.

試験結果を下表２に示すとともに、各供試体の曲げじん性試験結果を図６〜図８に示す。なお、曲げ靭性係数は、JHS 730-2003「繊維補強覆工コンクリートの曲げ靭性試験方法」に準拠して求めた。

本発明補強材は、曲げ強度及び曲げ靭性ともに最も高く、耐アルカリ性ガラス繊維ネットと比較すると、曲げ強度では1.13倍、曲げ靭性では1.37倍に向上し、ひび割れの発生及びひび割れ幅の抑制に大きく寄与することが判明した。 The specimen was a concrete specimen of □ 150 mm × L530 mm, and each reinforcing material was placed at a position 20 mm from the lower surface of the concrete specimen. The crack-suppressing reinforcing material 1 according to the present invention has three single-row models each having a plate thickness of 1 mm, a width of 45 mm, and a hole diameter of 40 mm. As a conventional reinforcing material, an alkali-resistant glass fiber net (width 150 mm) and an aramid triaxial mesh with sand (width 150 mm) were used. The concrete composition is shown in Table 1 below, and three concrete specimens were prepared for each reinforcing material.

The test results are shown in Table 2 below, and the bending toughness test results of each specimen are shown in FIGS. The bending toughness coefficient was determined according to JHS 730-2003 “Bending toughness test method for fiber-reinforced lining concrete”.

The reinforcing material of the present invention has the highest bending strength and bending toughness. Compared to the alkali-resistant glass fiber net, the bending strength is improved 1.13 times in bending strength and 1.37 times in bending toughness. Turned out to be.

<Example 2>
The crack suppressing reinforcing material 1 according to the present invention includes a single-row model and a multi-row model. When the multi-row model is used, the strength performance of the single-row model was tested as compared with the single-row model.

  As a one-row model, reinforcing materials with a plate thickness of 1 mm, a width of 45 mm, and a hole diameter of 40 mm are used. Two types of concrete are provided: holes arranged in a square arrangement and holes arranged in a staggered arrangement. A specimen (same composition as Example 1) was prepared. In addition, as a multi-row model, a concrete specimen (same composition as in Example 1) using one staggered hole reinforcing material having a plate thickness of 1 mm, a width of 130 mm, and a hole diameter of 40 mm was prepared and tested.

特に、３列モデルの曲げ靭性は、１列モデルに比べて、約５７％程度向上することが判明した。また、１列モデルの場合、孔が正方配列になるように設置するよりも、千鳥配置となるように配置した方が曲げ強度及び曲げ靭性が向上できることが確認できた。 The test results are shown in Table 3 below and shown in FIG.

In particular, it has been found that the bending toughness of the three-row model is improved by about 57% compared to the single-row model. In the case of the single-row model, it was confirmed that the bending strength and the bending toughness can be improved by arranging the holes in a staggered arrangement rather than installing them in a square arrangement.

<Example 3>
Furthermore, in the present Example 3, in the connection part which arranged the crack suppression reinforcements 1 and 1 in series, each hole located in the edge part side of two adjacent crack reinforcements 1 was overlapped and connected. Bending strength test results for verifying the difference between the case and the case where they were arranged in series without overlapping were performed.

  In the test, as in <Example 1>, the specimen was a concrete specimen of □ 150 mm × L530 mm, and the crack-suppressing reinforcing material 1 was placed at a position 20 mm from the lower surface of the concrete specimen. The crack suppressing reinforcing material 1 according to the present invention is arranged such that three single-row models having a plate thickness of 1 mm, a width of 45 mm, and a hole diameter of 40 mm are arranged, and the crack suppressing reinforcing material 1 and two holes are overlapped at the connecting portion. I did it.

  The test results are shown in FIG. As can be seen from FIG. 10, it was confirmed that the bending strength and the bending toughness can be improved when the holes are overlapped at the connecting portions of the crack suppression reinforcing members 1 and 1 as compared with the case where the cracks are not overlapped.

<Example 4>
In the present Example 4, it tested about the effect at the time of using together with another crack reinforcement material 1 with the crack suppression reinforcement material 1 which concerns on this invention.

(1) Effect by combined use of ring-shaped reinforcement material Along with a ring-shaped reinforcement material (1.5 vol% mixed) together with the crack suppression reinforcement material 1 (plate thickness 1 mm, width 45 mm, hole diameter 40 mm) A test was conducted for the combined use. This ring-shaped reinforcing material is a ring-shaped reinforcing material obtained by further punching a punched member (residual material) generated by punching holes.

  The test includes a strength test when the crack suppressing reinforcement 1 according to the present invention is used alone, a strength test when the ring-shaped reinforcing material is used alone, and a crack suppression reinforcing material 1 and a ring reinforcing according to the present invention. A bending strength test was conducted for the case where the materials were used in combination.

The results of this bending strength test are shown in FIG. A composite curve obtained by superimposing a load-deflection curve in the case of using a crack-suppressing reinforcing material alone according to the present invention and a load-deflection curve in the case of using a ring-shaped reinforcing material alone, and a crack-suppressing reinforcing material according to the present invention And the load-deflection curve in the case of the combined use of the ring-shaped reinforcing material is compared, and the difference is the synergistic effect by the combined use, but as shown in Table 4 below, about 30% of the composite curve It has been found that the toughness improving effect can be synergistically expected.

(2) Effect of Combined Use of Ring-shaped Reinforcement and Rod-shaped Fiber Next, the crack-reinforcement reinforcement (one-row model with 3 mm plate thickness, 45 mm width, 40 mm hole diameter) according to the present invention and a ring-shaped reinforcement material A strength test was conducted for the case of using both 1.5 vol% mixed) and rod-like fibers (0.5 vol% mixed).

  The test includes a strength test in the case where the crack suppressing reinforcing material 1 according to the present invention and the ring-shaped reinforcing material are used in combination, a case where PP rod-like fiber (0.5 vol%) is further mixed therein, and a steel rod-like fiber (0.5%). Bending test was conducted for the case of mixing vol.

なお、上記試験結果から、本発明に係るひび割れ抑制補強材１とともに、リング状補強材に代えて棒状繊維を併用した場合についても靭性向上効果が相乗的に見込めることが容易に予想できるものと考えられる。 The test results are shown in FIG. As a result of obtaining the bending toughness coefficient based on this test result, as shown in Table 5 below, when PP rod-like fibers (0.5 vol%) are mixed, the bending toughness is improved by about 20%, and steel rod-like fibers ( When 0.5 vol%) was mixed, the bending toughness was improved by about 70% and the bending strength was improved by about 30%.

From the above test results, it can be easily expected that the effect of improving toughness can be expected synergistically when a crack-like reinforcing material 1 according to the present invention is used together with a rod-like fiber instead of a ring-shaped reinforcing material. It is done.

  In the above embodiment, a steel material is used as a material for the crack suppression inhibitor. However, it is also possible to use a metal material other than the steel material as long as the required performance can be ensured.

  DESCRIPTION OF SYMBOLS 1 ... Crack suppression reinforcement material, 2 ... Steel strip, 3 ... Hole, 4 ... Stress distribution structural line, 5 ... Temporary fastener, P ... Rating part

Claims (6)

It is embedded along the surface near the surface of the concrete and is a reinforcing material for suppressing cracking,
As the material of the steel strip plate longitudinal dimension is formed longer than the width B, and the steel strip plate, a large number of circular holes with a maximum dimension or size of the coarse aggregate to be mixed Are formed in a regular pattern of a multi-row staggered arrangement ,
The thickness of the steel ribbon is 2 mm or less, and the width B of the steel ribbon is a diameter R × number of rows plus a dimension of the connecting width portion A × 2, The diameter R is at least 20 mm or more, the dimension of the connecting width portion A is 2.5 to 10 mm, the dimension C between the holes is 7 to 20 mm, and is a line connecting the center points of three adjacent holes Is a continuation of regular hexagonal turtle shell lines . The holes are formed by punching, and processing the punching member to the clip-like, according to claim 1 Symbol placement crack suppressing reinforcement used as a temporary fastener for connecting together crack suppressing reinforcement. A reinforced concrete in which the crack-suppressing reinforcing material according to any one of claims 1 and 2 is embedded in the vicinity of the surface of the concrete along the surface. In the connection part where the crack suppressing reinforcing materials are arranged in series, the respective holes located on the end side of two adjacent crack reinforcing materials are overlapped, and the structural continuity is achieved through the concrete existing in the holes. 4. The reinforced concrete according to claim 3 , wherein the reinforced concrete is maintained. The reinforced concrete according to any one of claims 3 and 4 , wherein a ring-shaped reinforcing material or a rod-shaped fiber is mixed together with the crack suppressing reinforcing material. The reinforced concrete according to any one of claims 3 and 4 , wherein a ring-shaped reinforcing material and rod-shaped fibers are mixed together with the crack suppressing reinforcing material.

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