JP2005320819A - Existing column reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure having sufficient aseismatic performance, in an existing column for arranging, for example, an aluminum sash between columns. <P>SOLUTION: A first reinforcing member and a second reinforcing member respectively formed in a substantially U shape so as to be capable of surrounding a side half part of the existing column, are installed on the existing column so that the mutual free ends of these reinforcing members are opposed, and both reinforcing members are embedded by a reinforcing thickness increasing material. The reinforcing thickness increasing material is formed of resin mortar such as polymer cement mortar or resin concrete of mixing an aggregate in this resin mortar, or is formed by mixing a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide or concrete mainly composed of cement, sand and gravel at a rate of 1 : 3 to 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reinforcing structure for existing pillars.

  Conventionally, as a method of reinforcing a columnar structure, for example, in order to withstand earthquakes, etc., reinforcing bars are placed around the existing pillars, a formwork is assembled, concrete is placed, and thickening by reinforced concrete is performed. RC hoisting method or a steel plate hoisting method in which a steel plate is arranged on the outer periphery of an existing column, and a filler such as mortar is filled between the steel plate and the column so that the existing column and the steel plate are integrated. Etc. are known.

  Therefore, in order to further improve the deformation performance especially in the earthquake resistance, a tensile resistance material (steel plate, glass fiber sheet, etc.) is wound up through a spacer arranged at an interval on the outer peripheral surface of the existing column. A seismic reinforcement structure is disclosed in which an inflatable permanent material (for example, expansive concrete or expansive mortar) is injected between a material and an existing column, thereby applying lateral restraint pressure to the existing column (for example, Patent Documents) 1).

  However, expansive permanent materials (expandable concrete, expansive mortar, etc.) injected between the pulling resistance material and the existing pillar used in the conventional winding method have high hardness but are poor in adhesion and cracking. There was a risk of this.

  Moreover, in the conventional winding method, in the case of steel plate winding, it cannot be applied to a column with a sleeve wall, and in the case of RC winding method, a reinforcing bar is provided on the sleeve wall portion adjacent to the column. Although it is necessary to provide a through hole for passing through, it is extremely difficult to drill this through hole at a position close to the existing pillar, and noise is generated during the drilling work, which greatly limits the work time. Moreover, since it is necessary to joint end parts after letting a reinforcing bar pass through a through-hole, construction took time and the cost of the whole reinforcement construction was increased.

Accordingly, the present applicant attaches the first and second reinforcing members, which are respectively formed so as to be able to surround the side half of the existing pillar, to face each other across the sleeve wall extending from the existing pillar, The reinforcing member is embedded with reinforcing concrete, and the reinforcing concrete is composed of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide, and iron oxide, Or the reinforcement method of the column with a sleeve wall made into the polymer cement which mixed concrete which has cement, sand, and gravel as a main component in the ratio of 1: 3-10 was proposed (for example, refer patent document 2).
JP 09-59934 A Japanese Patent Laid-Open No. 2004-060269

  However, if the first and second reinforcing members, which are substantially U-shaped so as to be able to surround the side halves of the existing pillars, are applied to the pillars without sleeve walls as they are, rolls occur due to, for example, an earthquake. In such a case, as shown in FIG. 7, the free end portions of the first and second reinforcing members may open outward.

  However, in the conventional winding method, mortar and concrete for increasing the thickness of existing columns are inferior in adhesive strength, toughness, and flexibility, and may crack.

  An object of the present invention is to provide a reinforcing structure of an existing pillar that can solve the above-described problems.

  In order to solve the above-described problem, in the present invention according to claim 1, the first reinforcing member and the second reinforcing member, which are formed in a substantially U-shape so as to be able to surround the side half of the existing pillar, are reinforced. While attaching to the said existing pillar so that the free ends of a member may oppose, it was set as the reinforcement structure of the existing pillar which embed | buried both reinforcing members with the thickening material for reinforcement.

  In this invention of Claim 2, in the reinforcement structure of the existing pillar of Claim 1, the said thickening material for reinforcement was resin concrete which mixed the aggregate in resin mortars, such as a polymer cement mortar, or this resin mortar. It is characterized by that.

  According to a third aspect of the present invention, in the reinforcing structure for an existing column according to the first aspect, the thickening material for reinforcement includes a composite polymer emulsion mainly composed of an acrylate ester copolymer, silicon oxide, and calcium oxide. It is characterized by being produced by mixing a main material mainly composed of iron oxide or a concrete mainly composed of cement, sand and gravel at a ratio of 1: 3 to 8.

  In this invention of Claim 4, in the reinforcement structure of the existing pillar of any one of Claims 1-3, the free ends which the said 1st reinforcement member and 2nd reinforcement member oppose are at least. It is connected at one place.

  In this invention of Claim 5, in the reinforcement structure of the existing pillar of any one of Claims 1-4, the said 1st reinforcement member and the 2nd reinforcement member are each a some vertical reinforcement, The first reinforcing member and the second reinforcing member are shared by a plurality of horizontal bars, and at least one of the plurality of horizontal bars is shared.

  In this invention of Claim 6, the 1st reinforcement steel plate and the 2nd reinforcement steel plate which were formed in the cross-sectional view substantially U-shape respectively so that the side half part of the existing column can be enclosed are made to the said existing column via an adhesive agent. The adhesive is made of resin mortar such as polymer cement mortar or resin concrete mixed with aggregate in this resin mortar.

  In this invention of Claim 7, the 1st reinforcement steel plate and the 2nd reinforcement steel plate which were formed in the cross-sectional view substantially U-shape respectively so that the side half part of the existing column can be enclosed are made to the said existing column via an adhesive agent. In addition, the adhesive is a composite polymer emulsion mainly composed of an acrylate ester copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or cement, sand, It was produced by mixing concrete composed mainly of gravel at a ratio of 1: 3-8.

  In the present invention according to claim 8, in the reinforcing structure of the existing column according to claim 6 or 7, the opposing free ends of the first reinforcing steel plate and the second reinforcing steel plate are arranged in the longitudinal direction of the existing column. In the present invention, at least one point is connected.

  In the present invention of claim 9, the existing pillar is surrounded by a reinforcing member, and the reinforcing member is a reinforcing mortar made of resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in this resin mortar. Buried.

  In the present invention according to claim 10, the existing pillar is surrounded by a reinforcing member, the reinforcing member is embedded with a reinforcing thickening material, and the reinforcing thickening material is mainly composed of an acrylate copolymer. The composite polymer emulsion and the main material mainly composed of silicon oxide, calcium oxide and iron oxide, or the concrete mainly composed of cement, sand and gravel are mixed at a ratio of 1: 3 to 8 to form. did.

  (1) In the first aspect of the present invention, the first reinforcing member and the second reinforcing member, which are formed in a substantially U-shape so as to be able to surround the side half of the existing column, are connected to the free ends of these reinforcing members. Even when an aluminum sash or the like is attached between the existing pillars because the reinforcing members are attached to the existing pillars so as to face each other and the reinforcing members are reinforced with the reinforcing pillars embedded in the reinforcing thickening material. Existing work can be reinforced with simple construction. Moreover, since it is not necessary to install a formwork with respect to the existing pillar, the cost of reinforcement work can be significantly reduced. Moreover, the reinforcing thickness of the reinforcing concrete is also relatively thin compared to the conventional case, and there is no possibility of narrowing the column installation space.

  (2) In the present invention according to claim 2, since the reinforcing thickener is resin mortar such as polymer cement mortar or resin concrete mixed with aggregate in this resin mortar, adhesion strength, tensile strength, bending Since the strength is high and it has sufficient toughness and flexibility, the adhesive force with the reinforcing member is also strong, and a sufficient seismic structure can be obtained.

  (3) In the present invention according to claim 3, the reinforcing thickener is a composite polymer emulsion mainly composed of an acrylate copolymer, and mainly composed mainly of silicon oxide, calcium oxide and iron oxide. Because it is a polymer cement mortar produced by mixing materials, or concrete mainly composed of cement, sand, and gravel, in a ratio of 1: 3-8, it has extremely high adhesive strength, sufficient tensile strength and bending strength. Furthermore, since it has sufficient toughness and flexibility, the adhesive force with the reinforcing member is extremely strong, and a more reliable seismic structure can be obtained.

  (4) In this invention of Claim 4, since it was set as the structure which connected the free ends which the said 1st reinforcement member and the 2nd reinforcement member oppose at least one place, the free end part of a reinforcement member is The reinforcing strength can be further increased by reliably preventing the outward opening.

  (5) In the present invention described in claim 5, the first reinforcing member and the second reinforcing member are each composed of a plurality of vertical bars and a plurality of horizontal bars, and at least one of the plurality of horizontal bars. Since the first reinforcing member and the second reinforcing member are shared, the desired reinforcing strength can be easily obtained by setting the number of reinforcing bars, and the first reinforcing member and the second reinforcing member are connected to each other. Is very simple and advantageous in terms of cost.

  (6) In the present invention described in claim 6, the first reinforcing steel plate and the second reinforcing steel plate, which are formed in a substantially U shape in cross section so as to be able to surround the side half of the existing column, are bonded to the existing column. Since the adhesive is resin mortar such as polymer cement mortar or resin concrete mixed with aggregate in this resin mortar, the adhesive strength, tensile strength, bending strength of the adhesive is used. Since it is high and has sufficient toughness and flexibility, the adhesive strength with the reinforcing steel plate is also strong, and a sufficient earthquake resistant structure can be obtained. Due to the extremely high adhesive strength, tensile strength, bending strength, and sufficient toughness and flexibility of the adhesive, the adhesive strength to the reinforced steel sheet is also sufficient, and sufficient reinforcement and earthquake resistance effects can be obtained with thin reinforcement. it can.

  (7) In the present invention according to claim 7, the first reinforcing steel plate and the second reinforcing steel plate, which are formed in a substantially U shape in cross section so as to be able to surround the side half of the existing column, are bonded to the existing column. The adhesive is attached in a facing state through an agent, and the adhesive is composed of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide or iron oxide, or cement. In order to obtain a polymer cement mortar produced by mixing sand and concrete mainly composed of gravel at a ratio of 1: 3 to 8, an extremely high adhesive strength of adhesive, sufficient tensile strength and bending strength, Since it has sufficient toughness and flexibility, the adhesive force with the reinforcing steel plate is also sufficient, and a more reliable reinforcing effect and seismic effect can be obtained by thin reinforcement.

  (8) In this invention of Claim 8, since the free ends which the said 1st reinforcement steel plate and the 2nd reinforcement steel plate oppose were connected in at least one place in the vertical direction of the said existing pillar, It is possible to reliably prevent the free end portion from opening outward as if it is a double door opening, thereby increasing the reinforcement strength.

  (9) In the present invention of claim 9, the existing pillar is surrounded by a reinforcing member, and the reinforcing member is made of resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in this resin mortar. Because it is embedded with a thick material, the reinforcing material has increased adhesion, tensile strength and bending strength, and has sufficient toughness and flexibility, so it has strong adhesion to the reinforcing member. A sufficient seismic structure can be obtained while adopting a conventional winding method.

  (10) In the present invention of claim 10, the existing pillar is surrounded by the reinforcing member, the reinforcing member is embedded with the reinforcing thickener, and the reinforcing thickener is made of the acrylate copolymer. A composite polymer emulsion mainly containing silicon and a main material mainly containing silicon oxide, calcium oxide and iron oxide, or concrete mainly containing cement, sand and gravel at a ratio of 1: 3 to 8. As a result, the adhesive strength to the reinforcing member is sufficient due to the extremely high adhesive strength, sufficient tensile strength and bending strength of the reinforcing thickener, and sufficient toughness and flexibility. While adopting, it is possible to obtain a more reliable reinforcement effect and earthquake resistance effect while reducing the thickness.

  The present invention provides a first reinforcing member and a second reinforcing member, each of which is formed in a substantially U shape so as to be able to surround the side half of the existing column, and the existing columns so that the free ends of these reinforcing members face each other. And a reinforcing structure of an existing pillar in which both reinforcing members are embedded with a reinforcing thickening material.

  In order to obtain such a reinforcing structure, if a reinforcing method comprising a kelen process on the surface of an existing column, an undercoating process with an undercoat material, a reinforcing member attaching process, and a thickening process with the reinforcing thickener is employed. Good.

  The reinforcing thickening material may be a resin mortar such as a polymer cement mortar or a resin concrete in which an aggregate is mixed in the resin mortar. Resin mortar and resin concrete have higher adhesive strength, tensile strength, and bending strength than ordinary mortar and concrete, and have sufficient toughness and flexibility. , You can get enough seismic structure.

  Furthermore, these resin mortars and resin concretes include composite polymer emulsions mainly composed of acrylate copolymers and main materials mainly composed of silicon oxide, calcium oxide and iron oxide, or cement, sand and gravel. It is preferable to produce the main component concrete by mixing it at a ratio of 1: 3 to 8.

  In the thickening step, a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide, and iron oxide are mixed at a ratio of 1: 3.5. After spraying or brushing the first type thickening material comprising the polymer cement mortar produced in this manner, the second type comprising the polymer cement mortar in which the composite polymer emulsion and the main material are mixed at a ratio of 1: 7. What is necessary is just to repeat this several times until it becomes the predetermined | prescribed thickness for the operation | work which coats the iron of a type thickening material continuously on the surface as 1 set.

  Such a reinforcing structure by the construction method is particularly suitable when an aluminum sash or the like is provided between the existing pillars.

  In other words, the existing pillars can be reinforced by simple construction without damaging the sash frame provided close to the inner surface of the existing pillar, without interfering with the sash frame, and without having to form a formwork. Is possible. The reinforcing thickness of the reinforcing thickening material is also relatively thin compared to the conventional case, and there is no risk of narrowing the space.

  In addition, the thickening material for reinforcement having the above structure has extremely high adhesive strength, tensile strength, bending strength, and has sufficient toughness and flexibility, so that the adhesive strength to the reinforcing member is also strong. , You can get enough seismic structure.

  In addition, as the undercoat material, the same material as the first thickening material having the above-described configuration can be used, and it may be sprayed or brushed.

  In addition, as a more desirable embodiment as a thickening material made of polymer cement mortar, ZnO is used as a cross-linking material, and glycine which is one of amino acids and is contained in a large amount of animal protein as an auxiliary material. It is. According to such a configuration, the physical properties of the polymer cement mortar can be further improved, and further, even if the existing column is displaced due to an earthquake or the like, the movement follows the movement, so that the reinforcing portion cracks or collapses later. Can be reliably prevented. In addition, since it has been confirmed that the rust prevention function is fulfilled, even if the reinforcing member is made of steel such as a reinforcing bar, it can be prevented from rusting and deteriorating, and the reinforcing effect can be sustained over a long period of time. A sufficient seismic effect can be obtained.

  By the way, it is desirable that the opposing free ends of the first reinforcing member and the second reinforcing member are connected in at least one place.

  In this way, by connecting the free ends of the first reinforcing member and the second reinforcing member at least at one place, the free end portion of the reinforcing member is outward even if the column rolls due to an earthquake or the like. It is possible to improve the reinforcing strength.

  The first reinforcing member and the second reinforcing member may each be composed of a plurality of main bars (vertical bars) and a plurality of band bars (horizontal bars), and at least of the plurality of band bars facing each other. What is necessary is just to connect a pair of straps to do.

  Alternatively, if at least one of the plurality of strips is shared by the first reinforcing member and the second reinforcing member, as a result, the first reinforcing member and the second reinforcing member face each other. It becomes simpler to have a configuration in which the free ends are connected to each other, and an existing material may be used, which is advantageous in terms of cost. Further, with such a configuration, a desired reinforcing strength can be easily obtained by setting the number of horizontal bars to be shared.

  Further, as another embodiment, a first reinforcing steel plate and a second reinforcing steel plate, each of which is formed in a substantially U shape in cross section so as to be able to surround the side half of the installation column, are bonded to the existing column via an adhesive. The adhesive may be resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in the resin mortar.

  In addition, as the adhesive, a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or mainly composed of cement, sand and gravel. Polymer cement mortar produced by mixing concrete with a ratio of 1: 3 to 8 can be obtained.

  In this case, the adhesive having the above structure has extremely high adhesive strength, tensile strength, bending strength, and sufficient toughness and flexibility. Therefore, the adhesive strength with the reinforcing steel plate is also sufficient, and thin-walled reinforcement is sufficient. Reinforcement effect and seismic effect can be obtained.

  And if the free ends which the said 1st reinforcement steel plate and the 2nd reinforcement steel plate oppose are further connected in at least one place in the vertical direction of the said existing pillar, the free end part of a reinforcement steel plate will be as if it is a double-spreading. Opening outwards can be reliably prevented, and the reinforcing strength can be further increased. In addition, as a material to be connected, a part of the reinforcing steel plates may be connected to each other by welding with the same quality connecting steel plates, or the outer circumferences of the first reinforcing steel plate and the second reinforcing steel plate are wound with reinforcing bars. It may be.

  By the way, in embodiment mentioned above, although demonstrated as what is suitable especially when the aluminum sash etc. were provided between the existing pillars and pillars, when reinforcing the usual pillar single-piece | unit, As a configuration, an earthquake resistance effect can be obtained.

  That is, an existing pillar is surrounded by a reinforcing member, and this reinforcing member is embedded with a reinforcing thickening material made of resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in this resin mortar.

  In other words, the adhesive strength, tensile strength and bending strength of the thickening material for reinforcement are increased, and since it has sufficient toughness and flexibility, the adhesive force with the reinforcing member is also strong, and has been conventionally known. A sufficient seismic structure can be obtained while adopting the winding method.

  Further, the existing pillar is surrounded by a reinforcing member, the reinforcing member is embedded with a reinforcing thickening material, and the reinforcing thickening material is combined with a composite polymer emulsion mainly composed of an acrylate copolymer, It may be produced by mixing a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or a concrete mainly composed of cement, sand and gravel at a ratio of 1: 3 to 8. .

  In this case, the thickening material for reinforcement can be expected to have higher adhesion, sufficient tensile strength and bending strength, and sufficient toughness and flexibility than the resin mortar and resin concrete described above. It becomes high, and it is possible to obtain a more reliable reinforcement effect and earthquake resistance effect while adopting a conventional winding method, making the reinforcement thin.

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

(First embodiment)
FIG. 1 is an explanatory view showing a reinforcing structure of an existing pillar according to the first embodiment, and FIG. 2 is a transverse sectional view thereof. In the present embodiment, a plurality of existing pillars 1 are erected at a predetermined interval, a front opening is formed between the existing pillars 1, and an aluminum sash (not shown) is attached in the front opening. And

  In order to improve the seismic resistance of the existing pillar 1, the reinforcing structure according to the present embodiment is substantially U-shaped so that the side halves 11 and 12 of the existing pillar 1 can be surrounded as shown in FIGS. 1 and 2. The first reinforcing member 3a and the second reinforcing member 3b formed in a shape are attached so as to hold the existing column 1 so that the free ends of the reinforcing members 3a and 3b are opposed to each other.

  The first reinforcing member 3a and the second reinforcing member 3b are arranged along the outer peripheral surface of the main reinforcing bar 31 serving as a vertical bar for each half-side peripheral surface (front and rear half-side peripheral surfaces in the drawing) of the existing column 1. In addition, the strips 32 are arranged in a nectar state at appropriate intervals, and the horizontal streaks 32 that are substantially U-shaped in plan view are also densely arranged in the vertical direction on each half-side peripheral surface of the existing pillar 1. In addition, each main bar 31 is welded to each other. The main bar 31 is connected and fixed to the existing column 1 via a mounting bracket (not shown) having an anchor or the like directly driven into the existing column 1.

  The first reinforcing member 3 a and the second reinforcing member 3 b are embedded with the reinforcing thickening material 4.

  The reinforcing thickening material 4 is a ratio of 1: 3 to 8 of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide. The material is polymer cement mortar produced by mixing in the above. Further, ZnO can be used as a cross-linking material, and glycine can be used as an auxiliary agent to promote metal cross-linking. In addition, it is good also as concrete which replaces with the said main material and has cement, sand, and gravel as a main component.

  The polymer cement mortar has extremely high adhesive strength, tensile strength and bending strength, and has sufficient toughness and flexibility. Therefore, even if the existing pillar 1 which is a concrete frame is displaced, it follows the movement. The reinforcing portion can be reliably prevented from cracking or collapsing later, and the first and second reinforcing members 3a and 3b can be firmly gripped. Therefore, it has sufficient strength as an earthquake-resistant structure while the reinforcement thickness is relatively thin, and the space where the existing pillars 1 are arranged is not reduced after reinforcement.

  The strong adhesion of the polymer cement mortar is thought to result from the following mechanism.

That is, an inorganic substance generally has a crystal structure in which constituent elements are regularly arranged and has excellent properties such as a large mechanical strength and a high melting point, but also has a large surface structural defect and is also characterized as a brittle body. . Such a surface tends to adsorb and stabilize water, and water H ⁺ dissociated on the surface combines with surface oxygen to form a hydroxyl group OH. This hydroxyl group is chemically reactive with organic substances, and the surface of silicon oxide in the main material is highly polar and rich in reactivity so that various organic reactions are possible. Also, CaO, which is a cement component, is a strong basic oxide that elutes the Ca ⁺² component and promotes hydration to the inside.

  When an inorganic material is brought into contact with a solution such as water, a potential difference is generated at the interface due to dissociation of surface hydroxyl groups, adsorption of ions, dipole orientation of molecules, and the like, and an electric double layer is formed. The property of electrification on the surface of inorganic materials has a great influence on surface modification by dispersion, adsorption, electrodeposition and adsorption between materials. This charge is negatively charged in an alkaline environment. In addition, the amount of adsorption increases under alkaline and electrolyte conditions.

  The reinforcing thickening material 4 made of the polymer cement mortar described above has such a property that the inorganic base agent has, as a composite polymer emulsion mainly composed of a water-soluble acrylate ester having a large number of hydrophilic groups and having flexibility. It is considered that a strong adhesive force is generated by mixing and forming an adhesive layer excellent in water resistance and environmental resistance with high adsorption performance to the solid surface by the interaction.

  Moreover, as described above, since the cement component is in a strong alkaline environment, rust that tends to occur in the first and second reinforcing members 3a and 3b and the mounting bracket is a kind of immobile oxide and its main component is water. Corrosion can be prevented by modifying the oxide film (black rust), which is iron oxide (II). Therefore, the reinforcing effect can be maintained for a very long time.

  Further, the above-mentioned polymer cement mortar is harmless, and there is no risk of generating harmful gases or igniting / exploding during and after construction.

  As described above, in this embodiment, the main reinforcing bar 31 connected and fixed to the existing pillar 1 is attached with a substantially U-shaped band streak 32 and densely arranged vertically so as to hold the half side portion of the existing pillar 1. Therefore, it was experimentally confirmed that even if an aluminum sash or the like is disposed between the existing pillars 1, it can be easily constructed and has sufficient strength.

  In addition, by using the reinforcing thickening material 4 described above, a sufficient seismic effect can be obtained only by reinforcing thin enough to coat the first and second reinforcing members 3a and 3b.

  The reinforcing structure described above is constructed according to the following procedure.

(1) Keren process First, the surface of the existing pillar 1 is shaved with a disk sander or the like, and the old coating film is peeled off.

(2) Undercoating step Next, an undercoating material composed of the same component as the above thickening material is sprayed or brushed on the surface of the existing pillar 1. In this case, the undercoat material is a mixture of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide in a ratio of 1: 3.5. Has been generated.

(3) Reinforcing member attaching step The first and second reinforcing members 3a and 3b formed so as to be able to surround the side halves 11 and 12 of the existing pillar 1 are attached in an opposing state. That is, the main reinforcing bars 31 constituting the reinforcing members 3a and 3b are arranged in a dense state along the outer peripheral surfaces of the side halves 11 and 12 of the existing pillar 1 using a mounting bracket (not shown). Next, band bars 32 bent in advance in a substantially U-shape are densely arranged in the vertical direction while being welded to the main bars 31 so as to correspond to the side halves 11 and 12 of the existing pillar 1. With the arrangement of the main bars 31 and the band bars 32, the first and second reinforcing members 3 a and 3 b are constructed to face the side halves 11 and 12 of the existing column 1.

  At this time, as shown in FIG. 3, among the plurality of strips 32, an appropriate strip 32 is used as a common strip 32 'shared by the first reinforcing member 3a and the second reinforcing member 3b, When the 1st and 2nd reinforcement members 3a and 3b are constructed | assembled, it shall be in the state connected by the said common band 32 'which both shared.

(4) Thickening step Then, the reinforcing thickening material 4 having the above-described component structure is laminated to embed the first reinforcing member 3a and the second reinforcing member 3b. As one thickening step, a thickening material composed of the same components as the undercoat is sprayed or brushed to increase the thickness by a predetermined thickness. That is, the reinforcing thickening material 4 here is a 1: 3 composite polymer emulsion mainly composed of an acrylate ester copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide. It is produced by mixing at a ratio of .5.

  Subsequently, in succession to the first thickening step, a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide are 1: 7. A second thickening step of applying the reinforcing thickener 4 produced by mixing at a ratio of iron is executed to obtain a predetermined thickening amount.

  Then, the first thickening step and the second thickening step are repeated as many times as necessary so that the thickening amount becomes a predetermined thickness necessary for reinforcement.

(5) Curing process Thereafter, the reinforcing thickener 4 is solidified and cured at an appropriate time, and the reinforcement of the existing pillar 1 is completed.

  In this way, sufficient reinforcement can be performed by an extremely simple construction, and the operation cost can be greatly reduced as compared with the conventional case. In addition, since at least one of the plurality of strips 32 is shared by the first reinforcing member 3a and the second reinforcing member 3b, the first reinforcing member 3a and the second reinforcing member 3b are connected to each other. As a result, each free end portion of the first and second reinforcing members 3a and 3b can be reliably prevented from opening outward as if double-spreading (see FIG. 6). The reinforcing strength can be increased.

  In addition, the connection between the first reinforcing member 3a and the second reinforcing member 3b becomes extremely simple, the cost can be reduced, and the desired reinforcing strength can be easily obtained by setting the number of the reinforcing bars 32. Become.

  In the reinforcing member attaching step (3), at least one of the plurality of strips 32 has been described as being shared by the first reinforcing member 3a and the second reinforcing member 3b. Of the plurality of straps 32 provided in the one reinforcing member 3a and the second reinforcing member 3b, at least a pair of the strips 32 that are opposed to each other may be connected by another connecting member. As the connecting member, a metal material having the same quality as the band 32 can be used, and this can be connected by welding.

  By the way, the reinforcing members 3a and 3b are each composed of the main bar 31 and the band bar 32, but as a modification, instead of the first mesh body having a mesh shape in advance as shown in FIG. 5a and the second mesh body 5b can also be used as the first reinforcing member 3a and the second reinforcing member 3b. The reinforcing effect in this case is the same as described above. In this case, when the first and second mesh bodies 5a and 5b are arranged along the existing pillar 1, they may be directly attached using a mounting bracket (not shown). Further, the first and second mesh bodies 5a and 5b use the same mesh body as a connecting material, and weld both ends of the connecting material to the first and second mesh bodies 5a and 5b, respectively. do it.

(Second embodiment)
FIG. 5 shows a second embodiment, in which first and second reinforcing steel plates 6a and 6b are used in place of the first and second reinforcing members 3a and 3b. In FIG. 5, the same reference numerals are used for the same components as those in the first embodiment.

  That is, the first and second reinforcing steel plates 6a and 6b, which are formed in a substantially U-shape in cross-section so as to be able to surround the both side halves 11 and 12 of the existing pillar 1, are placed through the adhesive 7 so as to face each other. Are installed.

  Moreover, the adhesive 7 is composed of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or mainly composed of cement, sand and gravel. It is made the polymer cement mortar produced | generated by mixing the made concrete with the ratio of 1: 3-8.

  That is, in this case, after the keren process, the adhesive 7 is applied to the entire side halves 11 and 12 of the existing pillar 1 and then substantially U-shaped so as to correspond to the side halves 11 and 12 of the existing pillar 1. The first and second reinforcing steel plates 6 a and 6 b formed in a shape are arranged and fixedly connected to the existing pillar 1 with anchor bolts 8.

  Although the first and second reinforcing steel plates 6a and 6b are exposed on the outer peripheral surface of the existing pillar 1, the existing pillar 1 and the reinforcing steel plates 6a, 6a, 6b is substantially integrated, and sufficient reinforcement with high earthquake resistance can be performed.

  In this case as well, the thickness required for reinforcement is thin, so that the column arrangement space is not narrowed. In addition, the reinforcement work is very simple and advantageous in terms of cost.

  Also in this case, the opposing free ends of the first reinforcing steel plate 6 a and the second reinforcing steel plate 6 b may be connected at least at one place in the longitudinal direction of the existing pillar 1.

  With such a configuration, it is possible to reliably prevent the free end portions of the first and second reinforcing steel plates 6a and 6b from opening outward as if they are double doors (see FIG. 6), and increase the reinforcing strength. Can do. In addition, as a material to connect, a part of 1st, 2nd reinforcement steel plates 6a and 6b may be connected by welding etc. with the same quality steel plate for connection, or the 1st reinforcement steel plate 6a and the 2nd The outer periphery of the reinforcing steel plate 6b can be wound with a reinforcing bar similar to the band 32 shown in the first embodiment. At this time, the reinforcing bars, the first reinforcing steel plate 6a, and the second reinforcing steel plate 6b may be appropriately welded.

(Third embodiment)
FIG. 6 shows a third embodiment. In the first and second embodiments described above, it has been described as being particularly suitable when an aluminum sash or the like is provided between the existing pillars. However, when reinforcing an ordinary pillar alone, The seismic effect can be obtained with the following configuration. In FIG. 6, the same reference numerals are used for the same components as those in the first and second embodiments.

  As shown in FIG. 6, in this embodiment, the entire existing pillar 1 is surrounded by a reinforcing member 9, and the reinforcing member 9 is made of resin mortar such as polymer cement mortar or resin in which aggregate is mixed in this resin mortar. It is buried with reinforcing thickener 4 made of concrete.

  Here, the reinforcing member 9 is the reinforcing bar composed of the main bar 31 and the band bar 32 as in the first embodiment. However, the reinforcing member 9 may be a mesh body as described in the modification of the first embodiment, or the second embodiment. It may be a steel plate as described in.

  That is, the reinforcing thickener 4 is replaced with normal mortar, concrete, or the like by using resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in this resin mortar. Adhesive strength, tensile strength, and bending strength can be improved. Furthermore, since resin mortar and resin concrete have toughness and flexibility more than ordinary mortar and concrete, Adhesive strength is also strong, and a sufficient seismic structure can be obtained while adopting a conventionally known winding method.

  Further, as the reinforcing thickener, a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or mainly cement, sand and gravel. It can be produced by mixing the component concrete with a ratio of 1: 3-8.

  In this case, the thickening material for reinforcement can be expected to have higher adhesion, sufficient tensile strength and bending strength, and sufficient toughness and flexibility than the resin mortar and resin concrete described above. It becomes high, and it is possible to obtain a more reliable reinforcement effect and earthquake resistance effect while adopting a conventional winding method, making the reinforcement thin.

It is explanatory drawing which shows the reinforcement structure of the existing pillar which concerns on 1st Example. FIG. It is explanatory drawing of a common band. It is explanatory drawing which shows the modification of the reinforcement structure. It is explanatory drawing which shows the reinforcement structure of the existing pillar which concerns on 2nd Example. It is explanatory drawing which shows the reinforcement structure of the existing pillar which concerns on 3rd Example. It is explanatory drawing of the reinforcement structure of the conventional existing pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing pillar 3a 1st reinforcement member 3b 2nd reinforcement member 4 Thickening material for reinforcement 6a 1st reinforcement steel plate 6b 2nd reinforcement steel plate 7 Adhesive 9 Reinforcement member

Claims (10)

The first reinforcing member and the second reinforcing member, which are formed in a substantially U shape so as to surround the side half of the existing column, are attached to the existing column such that the free ends of these reinforcing members are opposed to each other, A reinforcing structure for an existing pillar, wherein both reinforcing members are embedded with a reinforcing thickening material. 2. The reinforcing structure for an existing pillar according to claim 1, wherein the reinforcing thickening material is resin mortar such as polymer cement mortar or resin concrete in which aggregate is mixed in the resin mortar. The reinforcing thickening material is composed mainly of a composite polymer emulsion mainly composed of an acrylate copolymer and a main material mainly composed of silicon oxide, calcium oxide and iron oxide, or cement, sand and gravel. The reinforcing structure for an existing pillar according to claim 1, wherein the concrete is produced by mixing with concrete in a ratio of 1: 3 to 8. The reinforcing structure for an existing pillar according to any one of claims 1 to 3, wherein the free ends of the first reinforcing member and the second reinforcing member facing each other are connected to each other at least at one place. Each of the first reinforcing member and the second reinforcing member includes a plurality of vertical bars and a plurality of horizontal bars, and at least one of the plurality of horizontal bars is the first reinforcing member and the second reinforcing member. The reinforcement structure of the existing pillar of any one of Claims 1-4 characterized by the above-mentioned. The first reinforcing steel plate and the second reinforcing steel plate, each of which is formed in a substantially U shape in cross-section so as to be able to surround the side half of the existing column, are attached to the existing column in an opposing state via an adhesive, and A reinforcing structure for an existing pillar, wherein the adhesive is a resin mortar such as a polymer cement mortar or a resin concrete in which an aggregate is mixed in the resin mortar. The first reinforcing steel plate and the second reinforcing steel plate, each of which is formed in a substantially U shape in cross-section so as to be able to surround the side half of the existing column, are attached to the existing column in an opposing state via an adhesive, and A composite polymer emulsion mainly composed of an acrylate copolymer and an adhesive mainly composed of silicon oxide, calcium oxide and iron oxide, or concrete composed mainly of cement, sand and gravel. The reinforcing structure of the existing pillars produced by mixing at a ratio of 1: 3-8. The existing pillar reinforcing structure according to claim 6 or 7, wherein the opposing free ends of the first reinforcing steel plate and the second reinforcing steel plate are connected to each other in at least one place in the longitudinal direction of the existing pillar. . The existing pillar is surrounded by a reinforcing member, and the reinforcing member is embedded with a reinforcing mortar made of resin mortar such as polymer cement mortar or resin concrete mixed with aggregate in this resin mortar. Reinforcement structure. An existing pillar is surrounded by a reinforcing member, and this reinforcing member is embedded with a reinforcing thickening material. The reinforcing thickening material is combined with a composite polymer emulsion mainly composed of an acrylate copolymer, and silicon oxide. Of existing pillars characterized by being produced by mixing a main material mainly composed of calcium oxide and iron oxide, or a concrete mainly composed of cement, sand and gravel at a ratio of 1: 3 to 8. Reinforced structure.

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