KR101879817B1 - Reinforcing method of wood structure using steel bar embedded and steel plate attached lamination wood - Google Patents

Abstract

The method of reinforcing a tree structure using the reinforcing bars of the present invention and the steel plate-attached building materials comprises: Embedding reinforcing bars in the tensioning and compressing portions of the wood; Fixing the reinforcing bars embedded in the wood using an adhesive; And attaching an iron plate to the outside of the wood, wherein the adhesive is selected from the group consisting of an epoxy resin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood structure reinforcement method using a steel structure,

The present invention relates to a method for reinforcing a wooden structure, and more particularly, to a method of reinforcing a wood structure by reinforcing a reinforcing steel plate / steel plate- And a method for reinforcing a wooden structure using the same.

Recently, modern architecture has focused on environmentally friendly buildings in accordance with social demands, and eco-friendly materials are also attracting attention in building materials. Wood is the most representative eco-friendly material, such as conventional building materials.

On the other hand, after the Rio Environment Conference in 1992, forest resource-holding countries are taking measures such as banning the export of timber and imposing an export tax on the basis of its own forest protection and regulating the development of forest resources through the United Nations Environment Development Council (UNCED) The domestic and overseas timber industry structure is changing at a rapid pace as the supply of raw materials is unstable due to rising labor costs in Korea and the processing policies of the raw material producing countries. In addition, despite the sluggishness of the construction industry and the inadequacy of the legal system in Korea, the wooden buildings are showing a steady increase trend. In this social situation, the demand of general lumber is increasing, but supply is short. As the engineering wood which is developed to cover the demand of general lumber, there is a lumpy material. Because of the characteristics of the lumpy material, it can be used as timber by collecting the lumber after the lumbering and woodworking. .

In addition, compared with general wood, structural building materials are excellent in dimensional stability because they have few nodules such as shrinkage, twist, and heat. Second, they can guarantee performance according to the strength grade. Third, they have fire resistance performance. , And because it uses dry material, there is little burr and damage and CREEP phenomenon does not occur. Fifth, there is no limitation of dimension shape, and it is possible to manufacture suitable for design performance, , It is suitable for multi-layer structure, can standardize members and mechanization of processing, has a construction property that it is easy to construct and assemble, and is an excellent wood.

However, the structural building materials are manufactured by bonding the wood panels, making structural wood difficult because of the large difference in structural rigidity due to vertical and horizontal adhesion. Also, since the glued materials are likely to be brittle and suddenly destroyed, there is a problem in obtaining uniform stiffness and ductile behavior for use as an architectural structure.

Also, in order to solve the disadvantages of existing construction materials, research and development using various materials are underway. As a representative example, there is a FRP bar to replace the reinforcing bars. FRP bars have high tensile strength, elastic modulus, corrosion resistance, and light weight compared with steel bars. Therefore, it is used for repairing existing construction structures using reinforcing bars or for replacing reinforcing bars. However, in spite of this characteristic, since the material properties such as tensile strength and elastic modulus are very sensitive to temperature, it is necessary to consider the pre-construction temperature and the shear strength is not comparable to the reinforcing steel, There is a problem that the use of the material is very limited and the cost of the material is high. Especially, when FRP bars and reinforcing bars are compared with reinforcing bars, FRP bars have smaller shear strength than reinforcing bars, so that the deformation of the FRP bars is larger and the deflections and crack width of the structures increase after the cracks occur. Also, the FRP bar has a problem that the stress is linearly increased up to the maximum stress point at which the fracture occurs, and the brittle property is rapidly destroyed.

Korea Patent Publication No. 10-2009-0064830

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above problems of the prior art, and it is an object of the present invention to provide a method of manufacturing a reinforcing bar, which is capable of flexibly moving a collective material reaching a maximum load, And an object of the present invention is to provide a method for reinforcing a wooden structure using a laminated board.

In order to solve the above-mentioned problems, the present invention provides a method of reinforcing a wooden structure using a reinforcing bar and a steel plate- Embedding reinforcing bars in the tensioning and compressing portions of the wood; Fixing the reinforcing bars embedded in the wood using an adhesive; And attaching an iron plate to the outside of the wood, wherein the adhesive is selected from the group consisting of an epoxy resin.

The shape of the grooves of the wood for reinforcing bars may be saw-toothed.

The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

The reinforcing bar embedded in the wood may be a deformed reinforcing bar made up of a rod and a rib.

The length of the reinforcing bars embedded in the wood can be determined by the attachment length (2.5d _b ) according to the diameter of the reinforcing bars.

According to another aspect of the present invention, there is provided a method of reinforcing a tree structure using a reinforcing bar and a steel plate-attached building material, Embedding reinforcing bars in the tensioning and compressing portions of the wood; Fixing the reinforcing bars embedded in the wood using an adhesive; And a step of attaching an iron plate to the outside of the wood, wherein the reinforcing bars are slidably inserted into the troughs, the reinforcing bars include protrusions on the surface of the reinforcing bars, And one protrusion is formed on each of the right and left sides of the reinforcing bar in the form of a straight line, and the protrusion is formed in a structure in which the protrusion is protruded on the upper and lower sides at different heights from the left and right sides The shape of the trough may be a shape in which a reinforcing bar having a structure including the protruding portion can be inserted and slid into a rectangular groove structure formed in a " C " shape from the surface of the wood, Wherein the adhesive agent is formed in a shape including a recessed portion on the left and right sides of the trough, do.

The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

At least one or more of the grooves of the wood for reinforcing bars may be formed on the respective surfaces depending on the tensile portion of the wood and the surface area of the compressed portion.

According to another aspect of the present invention, there is provided a method of reinforcing a tree structure using a reinforcing bar and a steel plate-attached building material, Embedding reinforcing bars in the tensioning and compressing portions of the wood; Fixing the reinforcing bars embedded in the wood using an adhesive; And a step of attaching an iron plate to the outside of the wood, wherein the reinforcing bars can be slidably inserted into the inside of the trough, the reinforcing bars including concave portions on the surface of the reinforcing bars, Shaped grooves are respectively formed in the shape of an I-shaped reinforcing structure, and the shape of the grooves is such that the reinforcing bars of the structure including the concave portions can be slidably inserted, And a protrusion which can be engaged with recesses on the left and right sides of the reinforcing bar is additionally formed on the left and right sides of the trough, and the adhesive is selected from the epoxy resin system do.

The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

At least one or more of the grooves of the wood for reinforcing bars may be formed on the respective surfaces depending on the tensile portion of the wood and the surface area of the compressed portion.

The iron plate may be attached to the surface of the wood while enclosing the upper and lower surfaces of the wood in which the reinforcing bars are embedded as a "C"

Or "C" -shaped iron plate is further formed so as to include an iron plate protrusion in which the end of the iron plate protrudes toward the inner surface of the wood, and the left and right sides of the wood include two iron plate receiving grooves, The iron plate receiving groove is formed in a size and shape corresponding to the iron plate protrusion, and the iron plate is slidably inserted into the wood through the iron plate receiving groove and attached to the surface.

Or "C" shaped iron plate is further formed such that the end of the iron plate protrudes toward the inner surface of the wood, and the protrusion is formed to include two or more iron plate protrusions in the form of protrusions, and the left and right sides of the wood Wherein the iron plate projection receiving grooves are formed in a size and shape corresponding to the iron plate projections, wherein at least two or more receiving grooves are formed in a straight line at regular intervals, The steel plate may be attached to the surface of the wood in such a manner that the steel plate is engaged with the steel plate projection receiving grooves of the wood.

The reinforcing method of the wooden structure using the reinforcing bars and the steel plate-attached building materials according to the present invention has the following effects.

First, among the reinforcing materials, reinforcing bars having high tensile strength and shear strength characteristics are embedded in the building materials by using reinforcing materials, thereby enhancing the strength performance of the building materials, which is a problem in using the existing wood materials.

Second, the steel plate attached to the outside reinforces the strength of the wood, and also has an advantage in that it can solve the problem of the standstill occurring in the fiber direction of the wood.

Third, the problem of brittle fracture of the glued materials is solved by improving the ductility of the wood itself by embedding the reinforcing bars having the characteristics of soft destruction while exhibiting the nonlinear plastic behavior after the yield point, so that the glued material behaves softly It has the advantage of being able to.

Fourth, by attaching the reinforcing bars to the wood and simultaneously attaching the steel plates to the outside of the wood, the reinforcing strength by the reinforcing bars is reinforced within the wood, the flexural strength can be flexed when the reinforcing bars act on the reinforcing bars, It is possible to prevent detachment of the reinforcing bars embedded in the steel plate attached to the outside even if the bending stress is strong enough to be detached, that is, the bending stress exceeding the allowable value. Therefore, It has an advantage that excellent synergy effect can be generated in the circular holding side of the neck structure. Also, since the reinforcing bars are simultaneously installed in the tension portion and the compression portion, it is possible to simultaneously reinforce the compressive force and the tensile force (flexural strength) applied to the build material.

Fifth, the reinforcing bars and the reinforcing steel troughs each have a protruding portion or a concave portion and are formed to correspond to each other to increase the range of application of the adhesive, the contact range between the reinforcing bars and the troughs, And the adhesion strength between the adhesive and the adhesive can be improved. In addition, the shear strength can be improved according to the characteristic structure of the reinforcing bars and the reinforcing bars according to the present invention.

Sixthly, the iron plate attached to the outside of the wood also has a protruding portion or a concave portion in each of the iron plate and the iron plate trough, and is formed in a structure corresponding to each other so as to increase the application range of the adhesive and the contact range between the iron plate and the trough, It is possible to improve the adhesion strength between the steel plate attached to the plate and the binder and the adhesive. In addition, the shear strength can be improved according to the characteristic structure of the steel plate and the steel plate trough according to the present invention.

Seventh, when the reinforcing material is inserted into the inside, the problem of the existing reinforcing method, which can not be extended when the reinforcing material or the luting material is damaged, is widened. By embedding the reinforcing bar on the surface of the building material, It is possible to maintain the original shape of the wooden structure by replacing and repairing it.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a perspective view of a reinforcing material reinforced by embedding reinforcing bars in a serrated trough according to an embodiment of the present invention. FIG.
FIG. 2 is a perspective view of a reinforcing bar including a protrusion according to another embodiment of the present invention and a reinforcing bar reinforced with reinforcing bars in a trough formed by a structure corresponding to the reinforcing bar.
3 is a perspective view of an I-shaped reinforcing bar according to another embodiment of the present invention and a reinforcing reinforcing reinforcing bar embedded in a trough formed with a structure corresponding to the reinforcing bar.
FIG. 4 is a perspective view of a reinforcing member reinforced by simultaneously embedding reinforcing bars in a tension portion and a compression portion according to an embodiment of the present invention. FIG.
FIG. 5 is a perspective view of a reinforcing laminate reinforced by attaching reinforcing bars at the same time to a tension portion and a compression portion according to an embodiment of the present invention, and attaching a "C" shaped steel plate to the outside of the wood.
FIG. 6 is a perspective view illustrating a modified "? -Shaped iron plate in which a reinforcing bar is simultaneously embedded in a tension portion and a compression portion according to another embodiment of the present invention, and a distal end of the steel plate protrudes toward the inner surface of the wood, Is a perspective view of a building material reinforced by sliding insertion into an iron plate receiving groove of a wood formed with a structure corresponding to that of the building material.
FIG. 7 is a cross-sectional view illustrating a state in which a reinforcing bar is simultaneously embedded in a tension portion and a compression portion according to another embodiment of the present invention, and the end of the steel plate is formed as a " Is a perspective view of a reinforced laminated board in which an iron plate is engaged with and fitted to an iron plate projection receiving groove of a wood formed by a structure corresponding to the iron plate projection.
FIG. 8 is a view showing a procedure for reinforcing a reinforcing bar and a steel plate-adhered building material shown in FIGS. 1 to 7. FIG.
Fig. 9 is a view showing an actual operation of the reinforcement method of the present invention.
FIG. 10 is a perspective view showing the shape of a test specimen for performing an adhesion test for pulling a reinforcing bar with reinforcing bars embedded in a building material according to an embodiment of the present invention. FIG.

Hereinafter, a method for reinforcing a wooden structure using a reinforcing bar and a plate-attached building material according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a builder reinforced by embedding reinforcing bars in a sawtoothed trough according to an embodiment of the present invention. FIG. 2 is a perspective view of a reinforcing bar including protrusions according to another embodiment of the present invention, FIG. 3 is a perspective view of an I-shaped reinforcing bar according to another embodiment of the present invention, and reinforcing bars reinforced by embedding reinforcing bars in a groove corresponding to the reinforcing bars, FIG. 4 is a perspective view of a reinforcing plate reinforced by simultaneously embedding reinforcing bars in a tension portion and a compression portion according to an embodiment of the present invention, and FIG. 5 is a perspective view of a tensile portion according to an embodiment of the present invention. And FIG. 6 is a perspective view of a reinforcing material reinforced by attaching a reinforcing bar to the compression part at the same time and attaching a "C" shape steel plate to the outside of the wood. Purchase, of wood And a deformed "? &Quot; -shaped steel plate having an end of the steel plate protruding toward the inner surface of the wooden plate is slidably inserted into the steel plate receiving groove of the wooden plate corresponding to the steel plate, 7 is a cross-sectional view showing a state in which a reinforcing bar is simultaneously embedded in a tension portion and a compression portion according to another embodiment of the present invention, and the end of the steel plate is formed on the outer side of the wood with a " And FIG. 8 is a perspective view of the reinforcement of the reinforcing bars shown in FIGS. 1 to 7 and the reinforcing members attached to the iron plate. FIG. 8 is a perspective view of reinforced reinforcing bars bonded to the steel plate projection receiving grooves of the wood formed in a structure corresponding to the steel plate projections. FIG. 9 is a view showing the actual operation of the reinforcement method of the present invention. FIG.

As shown in FIGS. 8 to 9, the method of reinforcing a wooden structure using a reinforcing bar and a plate-attached builder according to an embodiment of the present invention includes: preparing a wood (S110); A wooden grooving step (S120); An adhesive application step; A reinforcing bar embedding step (S130); A step (S140) of reinforcing the wood with the adhesive to the wood trough, that is, using the adhesive to the wood; And attaching an iron plate to the outside of the wood (S150). In FIG. 8, the grooves of the wood are shown as regular rectangles, the reinforcing bars are formed as circular bars, and the troughs are formed as one piece in each of the wood compression part and the tension part, that is, the upper part and the lower part. It is to be understood by those skilled in the art that the present invention is not limited to such a structure.

Here, the wood preparation step (S110) is a step of preparing wood. In the present invention, an environmentally-friendly material, wood 10, preferably a lump, will be selected. It is a processing material made by adhering wood and pressing with high temperature and high pressure. It can freely shape and size, and can complement various disadvantages of ordinary wood. Therefore, it is advantageous that strength and characteristics are uniform compared with ordinary wood. Therefore, it is suitable for use as a structural wood as in the present invention. In addition, the wood preparation step S110 may include a surface planing step of the wood 10.

The type of the trough 101 in the wood grooving step S120 may be formed in a sawtoothed trough structure in which the surface of the groove is not smooth but is formed like a sawtooth shape as shown in Fig.

The saw-tooth-like trough structure is a trough structure designed in the present invention to increase the application range of the adhesive 20 applied to the surface of the wood 10. The serrated trough structure has an advantage that the adhesion strength between the reinforcing bars and the binder and the adhesive 20 can be increased by increasing the coverage of the adhesive 20 when compared with a general trough structure in which the surface of the groove is smooth.

In another embodiment of the present invention, the type of the trough 101 will be selected so as to accommodate specially designed reinforcing bars 200 in order to further improve the adhesion strength. Such a structure can be engaged with the shape of the reinforcing bar 200, and a groove can be formed so as to have the same cross-sectional shape as that of the reinforcing bar 200.

In other words, as shown in FIG. 2, the structure of the reinforcing bar 200 according to another embodiment of the present invention is such that the cross-section of the reinforcing bars is formed in a rectangular shape, and each of the left and right reinforcing bars has one protrusion And the protrusions 201 protrude from the left and right sides at different heights and protrude upward and downward, respectively. The structure of the trough 101 is such that the reinforcing bar 200 having the above-described structure can be slidably inserted into a groove structure of a rectangular shape formed from a surface of the wood 10, The recessed portion 102 may be formed on the left and right sides of the trough.

The protrusion 201 of the reinforcing bar 200 is coupled to the concave portion 102 of the trough 101 by forming protrusions on the left and right sides of the reinforcing bar 200 as shown in FIG. The strength between the reinforcing bars 200 and the troughs 101 can be improved. When the reinforcing bars are inserted into the wood, the bonding strength of the reinforcing bars may be different depending on the adhesion performance of the adhesive. However, since the bonding is formed between two objects having different physical properties, the strength against the shearing force is weak. However, due to the morphological characteristics of the reinforcing bar 200 and the trough 101 of the present invention, it is possible to exhibit strong strength against the shear force applied between the reinforcing bar 200 embedded in the binder and the trough 101, The possibility of fracture at the joint between the reinforcing bar 200 and the wood 10 can be lowered before the fracture occurs in the wood 10 itself.

In another embodiment of the present invention, the reinforcing bar 200 structure may be an I-shaped reinforcing bar 200 as shown in FIG. That is, the concave portions 202 are formed on the left and right sides of the rectangular reinforcing bars 200, respectively. The structure of the trough 101 is such that the reinforcing bar 200 having the above-described structure can be slidably inserted, and the reinforcing bars 200 can be inserted into the rectangular groove structure formed in the 'C' shape from the surface of the wood 10, A protrusion 103 that can be engaged with the concave portion 202 on the left and right sides may be additionally formed on the left and right sides of the trough 101.

The I-shaped reinforcing bars 200 have the H-shaped cross section so that the concave portions 202 like webs are formed between the flanges of the upper and lower portions to increase the overall moment of inertia of the reinforcing bars 200 themselves The upper and lower protrusions are widened in the attachment surface with the binder material and at the same time the lateral load on both the vertical and lower sides of the longitudinal direction of the reinforcing bars is dispersed So that the strength of the glued composite material can be increased and the ductile behavior ability can be improved.

The structure of the reinforcing bars 200 and the troughs 101 as shown in Figs. 2 and 3 increases the contact surface between the wood 10 and the reinforcing bar 200, and accordingly, the application range of the adhesive 20 is also increased, Is improved. In addition, since the reinforcing bars 200 and the troughs 101 are engaged with each other, not only the adhesive force of the adhesive 20 but also the bonding strength of the reinforcing bars 200 and the structure of the trough 101 itself is improved, Can be further improved.

In addition, at least one or more than one of the grooves 101 of the wood for reinforcing bars may be formed on each surface depending on the tensile portion of the wood and the surface area of the pressed portion. As the surface area is widened so that the embedded reinforcing bars exhibit uniform stiffness, the number of reinforcing bars embedded increases, thereby increasing the rigidity uniformly over the entire wood.

In addition, by embedding reinforcing steel (200) on the surface of the building material, it is possible to utilize the advantage of the building material as a building material having a high residual strength in the event of fire in the building structure and, in case of damage to the reinforcing material or the wood (10) It is different from the conventional reinforcement method in that it is easily replaced.

1 to 3, it is shown that only one of the troughs 101 is formed on the upper surface of the wood 10, but the troughs 101 and the reinforcing bars 200 are not shown in more detail It is to be understood that the invention is not limited to the embodiments shown in the drawings.

That is, as shown in FIG. 4, the troughs 101 can be formed simultaneously in the tensile and compressive portions of the wood, and the shapes of the troughs 101 and the reinforcing bars 200 are the same as those of the above- As shown in FIG. In FIG. 4, the shape of the trough 101 is shown as a regular rectangle. However, this is merely intended to illustrate that the reinforcement embedding is performed simultaneously in the tension portion and the compression portion, Will be clearly understood by those skilled in the art.

The step of applying the adhesive 20 is a step of applying the adhesive 20 to the trough 101 formed on the binding material to improve adhesion of the wood (binder) 10 and the reinforcing material (reinforcing bar) 200 . In one embodiment of the present invention, the method includes applying the adhesive 20 to a thickness of 2 mm. As the adhesive 20, an adhesive capable of bonding wood and carbon may be used. A preferred type of adhesive is an epoxy resin adhesive of a thermosetting resin adhesive. The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

The step of applying the adhesive 20 before the reinforcing bars 200 are inserted into the troughs 101 after the troughs 101 are formed may be performed by applying an epoxy coating to the surfaces of the reinforcing bars 200, Further effects such as adhesion and mechanical strength, heat resistance, chemical resistance, water resistance and the like can be added to the wood 10 as an additional effect. The epoxy resin-based adhesive 20 is excellent in adhesion between the same or different kinds of metals, woods and the like, and therefore is suitable for use as the adhesive 20 of the reinforcing bars 200 and the wood 10 of the present invention.

The reinforcing bar embedding step S130 is a step of applying the adhesive 20 to the wooden trough 101 in the adhesive applying step and then embedding the reinforcing bar 200 in the trough 101. [

The shape of the reinforcing bars 200 to be embedded in the glued laminated body is such that a circular reinforcing bar having no nodule and rib projections on the surface, a deformed reinforcing bar having ribs on the surface and protruding ribs, And may be selected from reinforcing bars manufactured in various forms to increase the strength.

In one embodiment of the present invention, the method includes embedding a deformed reinforcing bar 200 having protrusions of nodes and ribs on its surface. The deformed reinforcing bar is a reinforcing bar 200 having a protrusion such as a nodule and a rib formed on the surface of a circular reinforcing bar. When the reinforcing bar 200 is embedded in the building material, the cross- The adhesion strength between the adhesives can be improved.

In the reinforcing step (S140) of applying the adhesive 20 to the wood 10, the reinforcing bars 200 are embedded in the wooden troughs 101, and then the adhesive 20 is applied to the troughs (101). The coating thickness indicates the height of the adhesive 20 injected from the upper portion of the reinforcing bar 200. In the experimental example of the present invention, the coating thickness was 30 mm or 50 mm, and the adhesion strength according to the amount of the adhesive was compared.

As the adhesive 20 used for embedding the reinforcing bars 200 in the gluing material, an adhesive capable of bonding wood and carbon may be used. Preferably, an epoxy resin adhesive of a thermosetting resin adhesive will be used. The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

The epoxy resin used in the step of applying the adhesive 20 and the step S140 of injecting the adhesive 20 into the trough 101 has not only the adhesion performance but also the strong strength of the epoxy resin and the effect of preventing the corrosion of the reinforcing bars It is very preferable for embedding and attaching the reinforcing bars 200 to the build material.

Also, since the coating thickness of the epoxy may affect the adhesion characteristics, the adhesion strength between the reinforcing bar and the binder and the adhesive can be improved by setting a suitable coating thickness according to the type of the reinforcing bar 200 and the trough 101 as in the present invention There is an advantage that it can be improved.

The reinforcing step S140 of applying the adhesive 20 to the wood 10 may further include the step of injecting an epoxy resin into the trough 101 and then attaching the high strength fiber sheet to the upper surface of the epoxy resin injection have. Since the weight of the fiber itself is small, it is lightweight and natural corrosion does not occur. Therefore, it is possible to add high corrosion resistance and durability to the reinforced wood after reinforcement.

In step S150 of attaching the iron plate 300 to the outside of the wood, a step of attaching an iron plate to the outside of the surface of the wood on which the reinforcing bars are embedded, as shown in FIG. 5, .

By attaching the steel plate 300 in a form of covering the surface of the wood 10 on which the reinforcing bars 200 are embedded, the strength of the wood itself can be improved and the reinforcing bars 200, The attachment and binding force of the wood 10 can be reinforced by using the iron plate 300 which is a surface member. When the bending stress acts on the wire member, the wire member is much less likely to deviate from the heterogeneous member in contact with the wire member, even if the same adhesive agent having excellent adhesive performance is used because the contact area is significantly smaller than the surface member. When a wood structure is used in an architectural structure in which a larger load is expected, for example, in a large building structure, it is more preferable to insert the reinforcing steel in a linear shape alone or to reinforce one side of the wood by the steel plate alone. The iron plate 300 may be attached to the surface of the wood having the reinforcing bars 200 inserted therein to prevent the above-described detachment and to impart high strength to the wood.

The structure shown in FIG. 5 is a structure in which a steel plate 300 having a "C" shape is attached to the outside of the wood by using the adhesive 20 without the need to additionally form a groove on the surface of the wood to attach the steel plate 300 It is advantageous in that the construction is convenient.

In another embodiment of the present invention, the wood 10 has a receiving groove (not shown) that can accommodate a deformed "C" iron plate 300 to further improve the adhesion strength with the iron plate 300 131, 132). Such a structure is a structure in which the steel plate 300 and the wood 10 can be engaged with each other and the receiving grooves 131 and 132 can be formed to have the same cross section as the end face of the steel plate 300.

In other words, the structure of the iron plate 300 according to another embodiment of the present invention is a modified " C "shape iron plate as shown in FIG. 6, And may have a structure in which the end is formed so as to include the iron plate protrusion 301 in a form protruding toward the inner surface of the wood 10. Accordingly, the left and right sides of the wood 10 include two steel plate receiving grooves 131, and the steel plate receiving grooves 131 are formed in a size and shape corresponding to the iron plate protrusions 301, The iron plate 300 can be slidably inserted into the wood through the iron plate receiving groove 131 and attached to the surface.

The structure of the iron plate 300 as shown in FIG. 6 is such that the iron plate protrusion 301 is inserted into the inner surface of the wood 10 through the iron plate receiving groove 131 formed in the wood 10, It is possible to improve the binding force between the iron plates 300 attached to the outside.

In another embodiment of the present invention, the structure of the iron plate 300 is a modified " C "shape iron plate as shown in FIG. 7, and the modified" May be formed so as to protrude toward the inner surface of the wood, and the protrusions may be formed to include two or more iron plate protrusions 302 as protrusions. The iron plate receiving grooves 132 are formed on left and right sides of the wood to accommodate the iron plate protrusions 302 and the iron plate receiving grooves 132 are formed in a size corresponding to the iron plate protrusions 302 Two or more than two receiving grooves 132 are formed in a straight line with a predetermined interval so that the iron plate protrusions 302 are engaged with and engaged with the iron plate projection receiving grooves 132 of the wood, .

The structure of the iron plate 300 as shown in FIG. 7 is such that the iron plate protrusions 302 are inserted into the inner surface of the wood 10 through the iron plate projection receiving grooves 132 formed in the wood 10, It is possible to improve the binding force between the iron plates 300 attached to the outside of the wood. 6, the number of the iron plate protrusions 302 of the iron plate 300 to be attached is limited to the number corresponding to the number of the iron plate protrusions 302, Since the projection receiving grooves 132 are formed on the side surface of the wood 10, the loss of wood can be relatively reduced.

The combination of the iron plate protrusions 302 and the iron plate protrusion receiving grooves 132 can exhibit strong strength against the shear force applied between the iron plate 300 and the wood 10, It is possible to reduce the possibility that the coupling portion 10 is slipped and the coupling portion is destroyed. Since the plurality of iron plate protrusions 302 and the iron plate protrusion receiving grooves 132 are coupled to each other, the binding force can be maintained at a plurality of bonding sites even if fracture occurs at a small number of bonding sites The life of the reinforced wooden structure can be maintained longer.

6 and FIG. 7, since the projections or protrusions are included at the ends of the steel plate, the joining method in which the steel plates are inserted into the left and right sides of the wood can be firmly coupled by the structural coupling between the steel plate and the wood, Unlike the embodiment of FIG. 5, which must always use the adhesive, it is possible to selectively use the adhesive. In other words, the iron plate having the structure as shown in FIGS. 6 and 7 is different from the iron plate structure shown in FIG. 5 in that the iron plate can be structurally coupled even without using an adhesive for attaching the iron plate. However, since the adhesive 20 selected in the present invention can add to the wood 10 additional effects such as adhesiveness, mechanical strength, heat resistance, chemical resistance and water resistance, the adhesive 20 can be selectively used with the adhesive 20 Properties can also be added to the wood. As compared with the case of attaching the "C" shaped iron plate shown in FIG. 5 by using only the adhesive 20 on the outer side of the wood, the iron plate structures of FIGS. 6 and 7 do not use the adhesive at all or minimize the use of the adhesive It is more environmentally friendly. Especially, when the adhesive is not used, there is an advantage that it is easy to repair and replace when the steel plate attached to the wood or the wood or the steel plate attached to the wood is damaged.

In particular, according to the reinforcing method of the wood structure using the reinforcing bars embedded in the reinforcing bars as shown in FIGS. 5 to 7 and the wood-clad laminated building materials, the tensile and compression portions of the wood are reinforced through reinforcing bars and steel plates, It has the advantage of being able to fully reveal the characteristics of eco-friendly wood through the side part.

In addition, when wood is used in construction structures, it is common to require additional connecting structures to connect the wood to the wood. Especially, in order to secure the rigidity and ductility of the structural wood, the method using bonded steel is common, and the combined steel is also highly dependent on foreign imports. Due to the difference in the strength of the wood, the construction method using joining steel and bolt drilled pin occurs in the direction of the fiber direction of the wood, which can lead to brittle fracture and decrease the strength of the joint. That is, since the rigidity of the wood is low, there is a problem that the connection structure is easily broken in the connection structure portion of the wood, and recovery is not easy. However, according to the reinforcing method of the present invention using the reinforcing bars and the reinforcing wood structure using the iron-clad laminated building materials, the two woods can be connected through the steel plate attached to the tensioning portion and the compressing portion, Higher strength connections are possible. In addition, since the load received by the wood through the connection and the load acting on the connecting portion are dispersed through the steel plate attached to the outside of the wood, the overall rigidity of the wooden structure is improved and thus a more stabilized structure can be formed.

The step of attaching the iron plate 300 to the outside of the wood is performed in accordance with the shape and components of the iron plate 300 and the wood 10 shown in Figs. (20) is applied to the wood outer surface, the wooden attachment surface in the iron plate (300), the iron plate receiving groove (131), the iron plate receiving groove (132), the iron plate protrusion (301), and / . As the adhesive 20, an adhesive capable of bonding carbon and wood together, such as used for attaching between the trough 101 and the reinforcing bars 200, may be used, and a preferable type of adhesive is an epoxy resin adhesive of a thermosetting resin adhesive All. The epoxy resin adhesive may be selected from D-5250, AR-200, AR-16 and EFR-200.

In particular, the wood outer surface to which the iron plate 300 is attached, the wood attachment surface in the iron plate 300, the iron plate receiving groove 131, the iron plate receiving groove 132, the iron plate protrusion 301, and / The step of applying the adhesive 20 to the surface of the iron plate 300 may further include an epoxy coating effect on the surface of the iron plate receiving groove 131 or the surface of the iron plate receiving groove 132, Additional effects such as mechanical strength, heat resistance, chemical resistance, and water resistance can be added to the wood 10. The epoxy resin adhesive 20 is excellent in adhesion between the same or different kinds of metals or woods and is therefore suitable for use as the adhesive 20 of the steel plate 300 and the wood 10 of the present invention.

The metal plate receiving grooves 131 and the iron plate projection receiving grooves 132 formed on the wood as shown in Figs. 6 and 7 may be formed together when the trough 101 is formed in the wood grooving step S120, And the step of attaching the steel plate 300 to the outside of the step (S150).

In order to understand the effect of the present invention according to the reinforcement method of the wooden structure using the reinforcing bars and the steel plate-attached building materials, the present invention is characterized in that, using the same experimental model as that of FIG. 10, And the results of the adhesion test and the effect of the present invention are shown below as numerical data.

The thickness of the covering 20 of the adhesive 20, the type of the trough 101, the length of the reinforcing bar 200 according to the diameter of the reinforcing bar 200 and the length of the reinforcing bars 200 ) And the builder and adhesive (20). It will be apparent, however, to those skilled in the art that these examples are provided solely for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.

Experimental Example

(1) Experimental Plan

Table 1 shows a list of test objects. State variables of the specimens was planning to purchase method of the coating thickness, the general trough shape of purchase and purchase method, the diameter of the attachment length (2.5 d _b) and reinforced according to the diameter of the rebar trough of the sawtooth. The adhesive strength between the reinforcing bars embedded in the glued laminate and the glued laminate is investigated to determine the adhesive strength depending on the gutter type and the thickness of the glued laminate.

Specimen cross section as shown in FIG. 10 is a 350 × 350 mm, length is attached to the 25 d _b, the coating thickness is 30, 50 mm, was produced by deformed bar having a diameter of 10, 13, 16 mm.

(2) Experimental method

A simple drawing test was carried out in order to grasp the adhesion characteristics of reinforcing bars, adhesives and glues embedded in the glued materials. And, in order to investigate whether or not the yield point of the reinforcing bars reached during the test, the wire strain gage (W.S.G) was attached to the surface to examine the deformation of the reinforcing bars.

A universal testing machine (UTM) with a capacity of 2,000 kN was used. For all specimens, the pull force was constantly applied at a speed of 1 mm / min. In order to measure the slip length of the free end and the free end, two displacement detectors (hereinafter referred to as LVDT) were installed at the lower end and two LVDTs were installed at the free end to measure the slip length using four LVDTs.

(3) Experimental results

Table 2 shows the bond strength ( τ _b ), displacement, and failure modes between the reinforcing bars embedded in the wood and the binder and adhesive.

The bond strength ( tau _b ) was evaluated according to the following formula (1), and the displacement was represented by the displacement of the main rope installed at the fixed end.

(1)

(One)

Here, τ _b : adhesion strength

P _max : Load cell maximum load

Φ : the circumference of the major axis

L : Attachment length

In Table 2, it can be seen that the test specimens produced by serration show higher adhesion performance than the specimens prepared by general specimens. This shows a maximum increase of 79%, and all specimens showed a sudden decrease in load after maximum strength.

As can be seen from the experimental results,

First, the test specimens made of sawtooths showed higher adhesive strength than the specimens made of general troughs. In the general type test group, the attachment length increased from 300 mm in the test group to 300 mm in the serration test group, and 49 to 90% in the test group. In the comparison of the 500 mm test group, 79% bond strength. From this result, it can be concluded that the method of embedding the surface in sawtooth shape improves the bond strength between the reinforcing bar and the binder and the adhesive. It is considered that the sawtooth has a great influence on the bond strength, and it can be considered that the main adoption of the adhesive is caused.

Second, the bond strength of the specimens of 500 mm length was higher than that of specimens of 300 mm length.

Third, the specimens with high bond strength showed a tendency to increase the strain of the rebar.

Therefore, according to the reinforcing method of the present invention using the reinforcing bars and the wood-clad laminated building materials, the strength of the building material can be increased and the adhesion strength between the reinforcing bars and the building materials and the adhesive can be increased. The characteristic of the present invention is to overcome sudden brittle fracture which is an important problem as a structural wood of a structural building material, and it can add a soft behavior characteristic of the building material. In addition, according to the experimental results in the experimental example, the adhesion failure mechanism of the binder and reinforcing bar can be modeled and proposed.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100, 400, 500, 600, 700, 800, 900: Reinforcing and iron-clad laminates
10: Wood (laminated wood)
20: Adhesive
101: Leader
102: concave portion of the trough
103: protrusion of the trough
131: steel plate housing groove
132: steel plate projection receiving groove
200: Rebar
201: protrusion of reinforcing bar
202: concave portion of reinforcing steel
300: iron plate
301: iron plate protrusion
302: iron plate projection
S110: Wood preparation (planing) step
S120: Wood grooving step
S130: Reinforcing step
S140: Adhesive filling step
S150: Step of attaching iron plate

Claims (14)

delete delete delete delete delete Wood preparation stage;
Embedding reinforcing bars in the tensioning and compressing portions of the wood;
Fixing the reinforcing bars embedded in the wood using an adhesive; And
And attaching an iron plate to the outside of the wood,
The reinforcing bars may be slidably inserted into the inside of the trough,
The reinforcing bars each have a protruding portion on the surface of the reinforcing bars. The reinforcing bars have a rectangular cross section, and one protruding portion is formed on the left and right sides of the straight reinforcing bars. Are formed so as to protrude upward and downward at different heights from the left and right sides, respectively,
The shape of the troughs may be such that the reinforcing bars of the structure including the protrusions can be inserted and slid into engagement with the protrusions of the left and right sides of the reinforcing bars in a rectangular groove structure formed in a ' And the concave portion is additionally formed on the left and right sides of the trough,
The adhesive is selected from an epoxy resin system,
Wherein the step of fixing the reinforcing bars embedded in the wood using an adhesive further comprises the step of injecting the epoxy resin into the trough and then attaching the high strength fiber sheet to the upper surface of the epoxy resin injection hole. Reinforcing Method of Wooden Structures Using Steel Plate - attached.
The method according to claim 6,
Wherein the epoxy resin adhesive is selected from D-5250, AR-200, AR-16, and EFR-200, and reinforcing the wood structure using the iron-clad laminate.
The method according to claim 6,
Wherein at least one or more of the troughs for the purchase of reinforcing bars are formed on the respective surfaces according to the tensile portions of the wood and the surface area of the compressed portion.
Wood preparation stage;
Embedding reinforcing bars in the tensioning and compressing portions of the wood;
Fixing the reinforcing bars embedded in the wood using an adhesive; And
And attaching an iron plate to the outside of the wood,
The reinforcing bars may be slidably inserted into the inside of the trough,
The reinforcing bars include concave portions on the surface of the reinforcing bars. The reinforcing bars are formed in a structure in which concave portions are formed on left and right sides of a rectangular reinforcing bar, that is, an I-shaped reinforcing structure,
The shape of the trough is such that the reinforcing bars of the structure including the concave portions can be slidably inserted, and can be engaged with the concave portions of the left and right sides of the reinforcing bars in a rectangular groove structure formed in a " The protrusions are additionally formed on the left and right sides of the trough,
The adhesive is selected from among epoxy resins,
Wherein the step of fixing the reinforcing bars embedded in the wood using an adhesive further comprises the step of injecting the epoxy resin into the trough and then attaching the high strength fiber sheet to the upper surface of the epoxy resin injection hole. Reinforcing Method of Wooden Structures Using Steel Plate - attached.
10. The method of claim 9,
Wherein the epoxy resin adhesive is selected from D-5250, AR-200, AR-16, and EFR-200, and reinforcing the wood structure using the iron-clad laminate.
10. The method of claim 9,
Wherein at least one or more of the troughs for the purchase of reinforcing bars are formed on the respective surfaces according to the tensile portions of the wood and the surface area of the compressed portion.
12. The method according to any one of claims 6 to 11,
Wherein the iron plate is attached to the surface of the wood by wrapping the upper and lower surfaces of the wood embedded in the reinforcing bars as a "C" shape, and reinforcing the wood structure using the iron plate-attached build material.
12. The method according to any one of claims 6 to 11,
The "C" -shaped iron plate is further formed to include an iron plate protrusion in which the end of the iron plate protrudes toward the inner surface of the wood,
The left and right sides of the wood each include two steel plate receiving grooves, and the steel plate receiving grooves are formed in a size and shape corresponding to the iron plate projecting portions,
Wherein the iron plate is slidably inserted into the wood through the iron plate receiving groove and attached to the surface of the iron plate, and the reinforcing method of the wood structure using the iron plate-attached build material.
12. The method according to any one of claims 6 to 11,
The "C" shaped iron plate is further formed such that the end of the iron plate protrudes toward the inner surface of the wood, the protrusion is formed in a protrusion form so as to include two or more iron plate protrusions,
The iron plate projection receiving grooves are formed on the left and right sides of the wood to accommodate the iron plate projections. The iron plate projection receiving grooves are formed in a size and shape corresponding to the iron plate projections, and two or more receiving grooves are arranged in a straight line Respectively,
Wherein the iron plate is attached to the surface of the wood in such a manner that the iron plate protrusion is engaged with the iron plate projection receiving groove of the wood and is attached to the surface of the wood, thereby reinforcing the wood structure using the iron plate attached building material.

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