JP6184738B2 - Reinforcing structure for concrete member and method for constructing the same - Google Patents

Description

  The present invention relates to a reinforcing structure for a concrete member and a reinforcing construction method thereof.

  Conventionally, there has been a wound reinforcing structure using a steel plate or a fiber sheet as a reinforcing structure for a concrete member.

  Further, the inventors of the present application provide a concrete laminated material comprising a core material, a single material or a single material member arranged around the core material, and a restraint portion (lateral restraint material) for restraining them as a whole, and its A construction method has been proposed (see Patent Document 1 below).

JP 2011-226172 A

  However, in these conventional winding reinforcement structures, there is a problem in that a portion that receives a compressive force due to bending acts on a member, buckles, and breaks. In addition, for example, in the case of steel plate winding reinforcement, welding and mortar filling are necessary, and thus, the construction is troublesome and expensive.

  Moreover, when using the concrete laminated material which the present inventors proposed as a reinforcement structure, it is necessary to arrange many small members (single material) around the concrete member to be reinforced as a core material. However, the simple arrangement method has not been proposed so far, and there has been a problem that field work becomes complicated.

  In view of the above situation, an object of the present invention is to provide a reinforcing structure for a concrete member and a method for constructing the reinforcing member, in which a concrete member is reinforced by using a laminated structure, and the field work is quick.

In order to achieve the above object, the present invention provides
[1] In a reinforcing structure of a concrete member using a laminated structure in which a single material is arranged around the periphery and tightened with a lateral restraint material as a reinforcement of the concrete member, a minute protrusion for increasing frictional force on the surface of the single material or the core material characterized by comprising provided.

[ 2 ] In the reinforcing structure of a concrete member using a laminated structure in which a single material is arranged around the concrete member as a reinforcement of the concrete member and tightened with a lateral restraint material, in order to enhance the restraining force that the single material gives to the concrete member, It is characterized by bending a single material outward in advance .

[ 3 ] In a reinforcing structure for a concrete member using a laminated structure in which a single material is arranged around the concrete member as a reinforcement of the concrete member and tightened with a laterally restraining material, the single material is partially bound separately from the laterally restraining material that restrains the whole. It is characterized by being partially bundled by two .

[ 4 ] In a concrete member reinforcement structure using a laminated structure in which a single material is arranged around the concrete member as a reinforcement of the concrete member and tightened with a transverse restraint material, the single material is partially bound separately from the transverse restraint material that restrains the whole It is characterized by being knitted and bound with a material .

[ 5 ] In the reinforcing structure of a concrete member using a laminated structure in which a single material is arranged around the concrete member as a reinforcement of the concrete member and tightened with a transverse restraint material, a part of the single material is separated from the lateral restraint material which restrains the whole. Is partially bundled together with the concrete member .

[ 6 ] In the concrete member reinforcement construction method, a single prefabricated material is prepared in advance by fixing it to a temporary horizontal binding wire or a lateral constraining material in the state where the single material is thinned, and this single material of the lattice is made concrete It is characterized in that a single material is inserted into a gap which is fastened to the outer periphery of the member and thinned.

  According to the present invention, it is possible to improve the yield strength and toughness performance of a concrete member while reducing the construction cost and speeding up the field work.

It is a schematic diagram which shows the interdigital prefabricated single material which shows the Example of this invention. FIG. 2 is a drawing-substituting photograph of the interdigital prefabricated single material in FIG. 1. It is explanatory drawing which shows the method of combining the comb-shaped prefabricated single material of FIG. It is a drawing substitute photograph which shows the state of the operation | work which combines the comb-shaped prefabricated single material of this invention around a concrete member. It is a drawing substitute photograph which shows the state which arrange | positioned the comb-like prefabricated single material and was restrained by the fastening band. It is explanatory drawing which shows the schematic diagram of the grid | lattice-like prefab single material in the other Example of this invention, and the method of combining around a concrete member. It is an image figure of the state which assembled | stacked the lattice-shaped prefab single material roundly. It is the conceptual diagram which showed the result of performing the repeated bending loading of a simple beam form about the effect at the time of giving a laminated reinforcement to a concrete member. It is a figure which shows the example which provides the microprotrusion for frictional force reinforcement | strengthening on the surface of the round steel used as a single material, or a core material. It is a figure which shows the example which bent the single material beforehand outward in order to strengthen the restraint force which a single material gives to a core material. It is a figure which shows the example which gave prestress (tensile force) to the reinforcing bar beforehand in order to raise the yield strength and energy absorption capability of a member. It is a figure which shows the example made to arrange | position around a core material more than double in order to increase the quantity of a single material. FIG. 4 is a diagram showing an example in which a single material is previously bundled two by a partial binding material separately from a laterally restraining material that restrains the whole. It is a figure which shows the example which knitted and tied the single material with the partial binding member separately from the horizontal restraint material which restrains the whole. FIG. 5 is a diagram showing an example in which a part of a single material is partially bound together with a concrete member separately from a laterally restraining material that restrains the whole.

Reinforcing structure of the concrete member of the invention, arranged around a single material as a reinforcement for concrete members, Ri Na using the assembled structure tightened Confined material, frictional strength to the surface of the single material or a core material The minute projections are provided .

  Hereinafter, embodiments of the present invention will be described in detail.

  1A and 1B are schematic views showing an interdigital prefabricated material according to an embodiment of the present invention. FIG. 1A is a plan view arranged in an interdigital shape, and FIG. 1B is an interdigital prefabricated single material. FIG. 2 is a drawing-substituting photograph of the interdigital prefabricated single material. FIG.

  As shown in these figures, the dowel-shaped prefabricated single material 2 is preliminarily formed by partially bundling a plurality of single materials 1 of about a dozen or so in the range of size and weight that does not hinder manual transportation. A concrete laminated structure is constructed using a method of producing and combining this with the concrete member 3 on site. Here, the single material 1 is a small member such as round steel. It is also possible to use a steel plate that has been formed into a strip shape, a semicircle, a quarter circle, or the like and divided into a single material. Furthermore, it is possible to use a single material that has been disassembled and reused after using this laminated reinforcement.

  FIG. 3 is an explanatory diagram showing a concept in a case where a utility pole manufactured at a factory is reinforced by a prefabricated structure before building, and a method of combining the interdigital prefabricated materials of FIG.

  Since each comb-like prefabricated material has a weight of about 30 kg per piece, when assembling the prefabricated single material to a concrete member manually, a laminated structure is constructed with temporary fastening as described below. I will do it. First, as shown in FIG. 3 (a), the first prefabricated single material 12A is arranged around the concrete member 11, and as shown in FIG. . Next, as shown in FIG. 3 (c), the whole is rotated, and as shown in FIG. 3 (d), the second prefabricated single material 12B is placed adjacent to the first prefabricated single material 12A. Then, as shown in FIG. 3E, the second temporary fastening is performed. Next, as shown in FIG. 3 (f), the first temporary fastening is released and removed, and then the second temporary fastening is tightened as shown in FIG. 3 (g). By repeating the procedures of FIGS. 3D to 3G until the prefabricated single material 12 is sequentially adjacent to make a round of the concrete member 11, a reinforcing structure for the concrete member is configured.

  For example, as shown in FIG. 3 (h), when the first prefabricated single material 12A to the fourth prefabricated single material 12D are sequentially disposed, the sling 13 is disposed below the concrete member 11, and is Hang and tighten the wire. Next, as shown in FIG. 3 (i), the prefabricated single material 12E is arranged, and then, although not shown, the width fits the gap remaining between the prefabricated single material 12E and the first prefabricated single material 12A. If the interdigital prefabricated single material is disposed, and a gap is finally generated, the single material can be added one by one, and the entire material can be tightened with the lateral restraint material, so that the single material can be disposed without any gap.

  4 is a drawing-substituting photograph showing a state of the work of combining the interdigital prefabricated material of the present invention around the concrete member, and FIG. It is a drawing substitute photograph shown.

  In this way, the concrete member can be reinforced with the interdigital prefabricated single material. In the above-mentioned Patent Document 1, a method using a single unit is shown. However, according to the present invention, the single prefabricated material is interdigitally bent and can be freely bent, so that it can be deformed according to the cross-sectional shape of the object to be reinforced. The workability is improved.

  In addition, when reinforcing the existing concrete member already erected on site, the rotation from (b) to (c) in FIG. 3 is not performed. Moreover, the process of hanging and tightening with the crane shown to (h) of FIG. 3 is not performed.

  Next, a concrete member reinforcing method according to a second embodiment of the present invention will be described.

  FIG. 6 is an explanatory view of another method for reinforcing a concrete member of the present invention. FIG. 6 (a) is a schematic view showing a single piece of prefabricated grid according to the present invention, and FIG. 6 (b) is a single piece of prefabricated lattice. Sectional drawing which shows the state which attached the material to the concrete member, FIG. 7 is an image figure of the state which assembled | assembled the grid-like prefabricated single material roundly.

  As shown in these figures, for example, four pieces out of the number corresponding to the length of one round of the concrete member, that is, a single material 21 thinned out to a small number of about one per 90 degrees, is used for fastening the concrete member to the concrete member. A lattice-shaped prefabricated single material 23 is prepared in advance by binding to a temporary laterally bound material or a fastening band 22, and the single material from above or below the gap portion remaining after being fastened to the concrete member 24 in the field. The reinforcement structure of a concrete member is comprised by inserting.

  Examples of the concrete member described above include a utility pole, and the concrete member is reinforced by fastening a single prefabricated material to the outer periphery of the utility pole with a fastening band. Since the present invention is excellent in workability, it is particularly useful when applied to existing concrete members that are actually constructed. Moreover, for example, it can be applied to application to members other than concrete such as steel pipe columns.

  Of the examples where the present structure is applied to a concrete member, matters relating to mechanical performance will be described.

  FIG. 8 is a conceptual diagram showing a result of repeated bending loading of a simple beam type with respect to the effect when the reinforcement is applied to the concrete member. The vertical axis P represents the bending load, and the horizontal axis δ represents the displacement amount of the applied point. The case (1) where the reinforcement is applied is greater than the case (2) where the reinforcement is applied, and a structure having a greater load in the large deformation region and excellent in toughness can be obtained.

  By adopting the method shown in FIGS. 9 to 15 for the curve (1) below, it is possible to further improve the proof stress and toughness like the curve (3).

  In FIG. 9, minute protrusions 32 for increasing the frictional force are provided on the surface of a reinforcing bar or core material 31 used as a single material.

  In FIG. 10, the single material 41 is bent outward in advance in order to increase the restraining force that the single material 41 gives to the core material (concrete member) 42.

  In FIG. 11, prestress (tensile force) is applied to the single material 52 in advance after being attached to the core material (concrete member) 51 in order to increase the proof stress and energy absorption capability of the member after reinforcement.

  In FIG. 12, in order to increase the quantity of the single material 61, it arrange | positions around the core material (concrete member) 62 more than double.

  In FIG. 13, two single materials 71 are partially bound by a partial binding material 73 separately from a lateral restraint material (fastening band) for fastening the entire core material (concrete member) 72.

  In FIG. 14, a single material 81 is knitted and bound by a partial binding material 83 separately from a lateral binding material (fastening band) that restrains the entire core material (concrete member) 82.

  In FIG. 15, apart from the lateral restraint material (fastening band) that restrains the entire core material (concrete member) 92, a part of the single material 91 is partially bound together with the concrete member 92 by the partial binding material 93. .

  In this way, it is possible to reinforce the concrete member with a single lattice prefabricated material. In the above-mentioned Patent Document 1, a method using a single member is used. However, according to the present invention, the prefabricated single member can be freely bent as a lattice and a single member can be inserted into the gap. In addition, deformation is possible according to the cross-sectional shape of the object to be reinforced, and the workability is improved.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The concrete member reinforcement structure of the present invention can be used as a concrete member reinforcement structure and a method for constructing the reinforcement thereof, by quickly preparing a prefabricated single material in advance.

1, 21, 31, 41, 52, 61, 71, 81, 91 Single material 2 Interdigital prefabricated single material 3, 11, 24, 42, 51, 62, 72, 82, 92 Core material (concrete member)
12A to 12E First to fifth prefabricated single material 13 Sling 22 Temporary lateral restraint material or fastening band 23 Lattice-shaped prefabricated single material 32 Projection 73, 83, 93 Partial binding material

Claims (6)

In the reinforcing structure of a concrete member using a laminated structure in which a single material is arranged around the periphery as a reinforcement of the concrete member and tightened with a lateral restraint material, a minute protrusion for increasing the frictional force is provided on the surface of the single material or the core material. reinforcing structure of the concrete member, characterized by comprising. In the reinforcement structure of a concrete member using a laminated structure in which a single material is arranged around the periphery as a reinforcement of the concrete member and tightened with a lateral restraint material, in order to enhance the restraining force that the single material exerts on the concrete member, A reinforcing structure for a concrete member, which is bent outward in advance . In the reinforcement structure of a concrete member that uses a laminated structure in which a single member is placed around as a reinforcement of a concrete member and tightened with a lateral restraint material, a single member is placed around and tightened with a transverse restraint member as a reinforcement of a concrete member In the reinforcing structure of a concrete member using a structure, the single member is partially bound by a partial binding material separately from the lateral restraint material for restraining the whole, and the concrete member reinforcing structure is characterized in that In the reinforcement structure of a concrete member using a laminated structure in which a single material is arranged around the periphery and tightened with a lateral restraint material as a reinforcement of the concrete member, the single material is braided with a partial binding material separately from the lateral restraint material that restrains the whole. A reinforcing structure for a concrete member, characterized by being bundled . In the reinforcing structure of a concrete member using a laminated structure in which a single material is arranged around the periphery as a reinforcement of the concrete member and tightened with a lateral restraint material, a part of the single material is separated from the concrete material separately from the lateral restraint material that restrains the whole. A reinforcing structure for a concrete member, characterized by being partially bound together with the member.   In a state where the single material is thinned, it is fixed to a temporary horizontal binding wire or a lateral restraint material, and a lattice-shaped prefabricated single material is prepared in advance, and the lattice-shaped single material is fastened to the outer periphery of the concrete member and thinned. A method for reinforcing construction of a concrete member, wherein a single material is inserted into the gap.

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