JPH07324386A - Method for connecting joint part of fiber-reinforced columnar member, and connecting auxiliary member - Google Patents

Abstract

PURPOSE:To connect and fix a fiber-reinforced columnar member to a fiber- reinforced auxiliary member, and enhance the joint by closely adhering one surface of the outer wall of a cylindrical connecting auxiliary member and the ground to the fastening surface of each fiber-reinforced columnar member, and fastening and fixing them by a bolt and a nut. CONSTITUTION:An I-shaped sectional column 4 is connected to a beam 5 of the same form by use of a connecting auxiliary member 6. Namely, the connecting auxiliary member 6 is mounted on the I-shaped column 4 and the beam 5 by mounting bolts 7, 7 substantially symmetrically to the longitudinal central line of the column 4 and the beam 5 and inserting the bolts 7, 7 through the whole width of the column 4 and the beam 5. A fiber-reinforced cylindrical member 3 having two or more connecting contact surfaces to the outer wall at prescribed angles as the connecting auxiliary tool 6 is enhanced in strength reliability of each part from the view point of manufacturing method to allow the continuous automatic production. Each auxiliary member is cut crosswise at extrusion or use so that the length can be freely selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention interposes a fiber-reinforced connecting auxiliary material made of a tubular material in a joint portion of a structure for connecting two fiber-reinforced columnar materials to each other. The present invention relates to a method for connecting a joint portion of a fiber-reinforced columnar material and a connection auxiliary material for the purpose of connecting and fixing and by connecting bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, two fiber-reinforced columnar members (I-shaped section)
To connect the right-angled joints of the above, a dust-proof molded article having two surfaces that are at right angles to each other and the two surfaces connected by a triangular web is formed. A technique has been proposed in which, as a connection auxiliary material, the two surfaces are brought into contact with the respective connection surfaces of the columnar material, and then the corresponding contact portions are connected and fixed with bolts and nuts.

[0003]

However, since the conventional connection auxiliary material is manufactured by the resin transfer method (hereinafter referred to as the RTM method), the inner side thereof can be easily formed by a normal punched taper core, but the outer side is a drafted taper. Therefore, there is a problem in that the outer mold has to be a disassembled mold, which is extremely inferior in productivity, and thus relatively expensive.

Further, when the RTM method is carried out, the installation position of the reinforcing mat may be displaced, and therefore the strength may be nonuniform, so that the reliability is deteriorated and the preform mat is used to avoid this. If used, there was a problem that it would lead to soaring material costs.

[0005]

According to the present invention, a long hollow polygonal molded product whose cross section is substantially triangular, square or the like is produced by a pultrusion molding method or another manufacturing method, and this is cut into a ring and connected. By using the auxiliary material, the above-mentioned conventional problems have been solved. By the above, the strength nonuniformity of the connection auxiliary material is remarkably improved, the management at the time of manufacturing is facilitated, and the productivity is remarkably improved as compared with the RTM method. Can now be provided to.

That is, according to the invention of the method, one end face of one of the two fiber-reinforced columnar members is brought into contact with the other end face thereof at a predetermined angle, and a connection auxiliary member is interposed in the abutting joint portion, In a connection method for fixing two columnar members and a connection auxiliary member, the connection auxiliary member is a cylindrical member, and one surface of an outer wall of the cylindrical member is brought into contact with a tightening surface of the one columnar member. Along with, the other surface is brought into contact with the tightening surface of the other columnar material, and the columnar material and the tubular material of each of the close contact portions are tightened and fixed by bolts and nuts, respectively. This is the connection method for the joint section.

Further, the invention of the present invention is a connector connecting aid for a fiber reinforced columnar material, characterized in that it is a fiber reinforced tubular material having at least two connecting contact surfaces on the outer wall at a predetermined angle. Another invention of the present invention is the connection auxiliary member for a fiber reinforced columnar member according to claim 2, wherein the fiber reinforced tubular material is formed by cutting a long hollow pultruded product into slices.

When an external force that changes the angle between the pillar and the beam to be connected when the above-mentioned connection auxiliary material is used, a force that necessarily changes the angle formed by the connection auxiliary material and the contact surface However, the connection auxiliary material exhibits rigidity with respect to the external force that attempts to change the angle,
It can play the role of a connector sufficiently.

The connection auxiliary material for carrying out the method of the present invention has high rigidity against an external force for changing an angle from a desired angle formed by columns and beams or beams and beams (hereinafter, only the former including the latter field). Need to be shown. Therefore, the extrusion molding method of the thermoplastic resin, which continuously produces a long product having the same shape as the connection auxiliary material used for carrying out the method of the present invention, is an inappropriate molding method from the viewpoint of the rigidity of the molded product. Is.

That is, in view of the high rigidity of the connection auxiliary material as well as the creep resistance and the shape thereof, a filament winding method (hereinafter referred to as FW method) or a hand lay-up method may be used in addition to the pultrusion method. A manufacturing method is considered in which a hollow columnar body is made and then cut into slices. These methods have an advantage that the volume fraction of the effective fiber reinforcement that contributes to the rigidity against the force from the side surface of the connection auxiliary material can be increased more than the pultrusion molding method. On the other hand, however, since the molded product has a large thickness, it is difficult to form a flat surface having a desired angle to be in contact with the pillar and the beam in an angularly correct manner. According to these methods, a molded product is produced by a batch operation with a length of 0.5 to several meters, and then it requires time and labor to perform a round slice as another work. Further, in these molding methods, a core that is required to form a hollow is prepared for each molding by some method, or since it takes time to cure and die, it becomes a core. There is a problem that many types must be prepared.

As a result, these molding methods are more economical than the RTM method for producing a high dust removal connection auxiliary material, but are less economical than the pultrusion molding method. Therefore, in order to provide an inexpensive and reliable connection method for columns and beams, it is preferable to form the connection auxiliary material by the pultrusion method, but even if it is made by other methods, it is included in the connection method of the present invention. .

In order to increase the rigidity of the connection auxiliary material,
The material needs to be a fiber reinforced thermosetting resin.

Next, examples of the fibrous reinforcing material include long fibers such as glass fibers, carbon fibers and wholly aromatic nylon (aramid) fibers. The factors that control the rigidity of a molded product having the same cross-sectional shape are at least the elastic modulus of the reinforcing material fiber and the volume content of the fiber in the molded product. Therefore, it is desirable to use high-rigidity carbon fiber and to increase the volume content thereof to 30% or more in the production of the connection auxiliary material for carrying out the method of the present invention. However, from the viewpoint of material cost and molding operation, the volume content of glass fiber should be 3%.
It is generally set to 0% or more. As the liquid resin which is the other one of the main raw materials used for producing the connection auxiliary material which is a composite material, α, β-unsaturated polyester,
Examples thereof include radical curable resins such as vinyl ester and urethane methacrylate, and ion curable resins such as various epoxy resins and resol phenolic resins. Since the difference between these resins has little influence on the rigidity of the molded product, α, β-unsaturated polyester or vinyl ester is most commonly used for the selection of the resin because of the price and ease of molding operation. Target. Another important method for increasing the rigidity of the molded product is to increase the wall thickness of the hollow molded product. From such a viewpoint, it is desirable that the thickness of the connection auxiliary material is 5 mm or more, while if it is unnecessarily increased, the molding speed will be significantly reduced. The appropriate thickness should be empirically determined because it depends on the strength of the pillars or beams, as well as the bolts and nuts used for fixing, and in many cases it is about 5 to 13 mm. It is also effective to improve the rigidity that the corners of the connection auxiliary member and the vicinity thereof have a larger wall thickness than other portions. The cross section of the connection aid is substantially three to square. Further, it is necessary for the connection auxiliary member to have a contact surface (which may be a normal surface or a fitting concavo-convex surface) that should come into close contact with the respective flat surface portions of the pillar and the beam that intersect at a desired angle. The planes do not necessarily have to be adjacent, and for example may be trapezoidal in cross section of the connecting piece. The cross-sectional shape and dimensions of the connection aid should be such that it does not interfere with its operation when bolting it to a column or the like.
As the most common example, when the crossing angle is 90 degrees, the cross-sectional shape of the connection auxiliary material is close to a square having two surfaces intersecting at 90 degrees, and the length of one side is usually about 80 to 200 mm. The cross-sectional shape of the connection auxiliary material is not limited to having a flat surface in contact with the pillar and the beam, but it is also possible to consider a part that is an arc and a pentagonal shape, but since no special advantage is found, They are also included in the scope of the present invention as long as the connection auxiliary material is made in the same manner as described above and the connection between the column and the beam is made by bolting. The shape in which the supporting plate is provided in the hollow portion inside the connection supporting member is also a connection supporting member suitable for practicing the present invention, but the position of the supporting plate is such that it does not cause any trouble when mounting it on a pillar or the like. Need to be specified in. The length of the connection aid is usually the same as the width of the column or beam to be connected. When the length is short, the force accompanying the change in the angle formed by the post and the beam after connection is intensively applied to the connection auxiliary member, which is disadvantageous in that the strength tends to be insufficient.

The pultrusion molding method for producing the connection auxiliary material is carried out by using a known curing agent and / or curing accelerator depending on the liquid resin used and a release agent. For the usage of these auxiliaries and molding conditions, the knowledge known for each liquid resin can be utilized.

That is, the method of chemically forming the connection auxiliary material is not different from the conventional technique, but for the purpose of adjusting the viscosity of the resin so that it can be operated easily, the liquid resin is used together with a filler of about 5 to 30% by weight. Sometimes. As the filler, calcium carbonate and aluminum hydroxide are generally used, and this point is no different from the conventional knowledge. As a hollow pultrusion method, it is usual to use a metal fixed mandrel (core type) that is cantilevered so as to form a hollow. It is also possible to insert it into a molding die on the outside together with the fiber reinforcing material, which is to be used as a twist core. In the latter case, the core material is attached to the inside of the completed connection auxiliary material. In many cases it can be used as a connection aid without stripping. Since the connection auxiliary material molded as described above is thick, the method of using the conventional impregnation tank has higher reliability of the impregnation than the injection drawing method. Roving, which is a fiber-reinforced material necessary for the drawing operation (a bundle of fibers in one direction), does not contribute so much to the rigidity of the connection auxiliary material with respect to the change in the angle formed by the column and the beam. Since the rigidity is mainly given by a cloth or a mat (nonwoven fabric), it is desirable to increase the usage amount as much as possible, and it is possible to carry out the usage at 17% by volume or more without great difficulty. In the RTM method, the matte content is only 17% by volume at the maximum. If compared, the connection auxiliary material used in the method of the present invention and the connection auxiliary material formed by the known bamboo dust collecting RTM method are While saying that the shapes are different, it can be seen that the former has high rigidity.

After the pultrusion molding, it is advantageous to cut the long piece of the connection auxiliary material by using a cutting material attached to the pultrusion molding machine and sequentially cutting into a predetermined length while molding. Is. Of course, it can also be stored as a certain length of material and cut into slices if necessary at a later date.

To attach one of the connection auxiliary members to the pillar and the beam, bolts and nuts are used. Although an attachment method using an adhesive can be considered, there is a problem in relying only on the adhesive to maintain sufficient adhesive strength for a long period of time. The position of the hole for inserting the bolt is not different from that of iron. There are various materials for bolts and nuts such as iron, brass, stainless steel, composite materials containing glass fiber, liquid crystal polymer, ceramic, etc.
The structure made of beams will be selected in consideration of the purpose of use and the environment. For example, in the case of a building where it is necessary to avoid electromagnetic interference, a non-metallic material, especially a composite material containing glass fibers, is preferred. When the structure is required to have corrosion resistance, a composite material containing stainless steel or glass fiber is usually used depending on the content of the corrosion resistance.

The present invention will be described in more detail with reference to the following examples. In addition, "parts" and "%" are "parts by weight" and "% by weight" unless otherwise specified.

[0019]

According to the present invention, since the fiber reinforced tubular member having at least two connecting contact surfaces at a predetermined angle on the outer wall is used as the connection assisting tool, the strength reliability of each part is high in the manufacturing method and the continuous automatic operation is possible. In addition to being producible, each of the auxiliary materials may be used in a sliced shape at the time of extrusion or use, so that the length can be freely selected.

[0020]

Example 1 As described above, various known methods can be considered as the method for forming the connection auxiliary material, but the most preferable pultrusion molding method will be described with reference to an example.

That is, bisphenol type vinyl ester 10
10 parts of calcium carbonate powder having an average particle size of 2 μm was added to 0 part.
Parts, and 1 part of Moldvith EQ-6 (manufactured by Axel Co., USA) as a release agent was added. The viscosity of the liquid is 12 at 25 ° C.
It was 00 CPS. Perbutyl O (manufactured by NOF CORPORATION) and Percure HI (manufactured by NOF CORPORATION) were added to the liquid as hardeners in an amount of 1% each to prepare a molding liquid used for pultrusion. The mold consists of an outer mold and a core mold, and the total length is 1.2 m. The temperature of the first half and the second half of the mold is 1
Through a glass roving 1 and a continuous glass fiber mat 2 which were kept at 40 ° C. and 150 ° C. and impregnated with the molding liquid, a cylindrical molded product 3 having a cross-sectional shape of an isosceles right triangle was obtained. The thickness of each side is 10
mm, and the length of the sides orthogonal to each other is 100 mm. The thickness around each corner 3a is increased. In this molded product, the volume content rates of the continuous glass fiber mat 2 and the glass roving 1 were 22% and 18%. A length of 100 mm was cut while drawing was carried out to obtain a connection auxiliary member 6 for use in the present invention.

FIG. 1 shows the state of a joint in which a beam 5 of the same shape as a column 4 having an I-shaped cross section with a flange width of 100 mm and an overall height of 100 mm is connected by using the connection auxiliary material. . Various sectional shapes of the pillar 4 and the beam 5 can be used as shown in FIG. That is, the connection auxiliary member is attached to the I-shaped column 4 and the beam 5 with bolts 7 and 7 and nuts 8 and 8, and the column 4 and the beam 5 are connected and fixed. Since the bolts 7 and 7 are attached substantially symmetrically with respect to the center line of the column 4 and the beam 5 in the longitudinal direction, the number of bolts 7 is four in total. As for the method of mounting the bolt, it is preferable that the bolt is penetrated over the entire width of the pillar 4 and the beam 5, and the nut is tightened on the outside thereof. Although illustration is omitted, there is a case in which the connection auxiliary member is brought into contact only with the upper side of the beam and tightened and fixed with bolts and nuts, but in this case, attention must be paid to strength.

[0023]

Example 2 Using the molding liquid shown in Example 1, pultrusion molding was performed to obtain a connection auxiliary member 9 having a trapezoidal cross section and a length of 100 mm. FIG. 2 shows an example in which an L-shaped beam 8 having a width of 80 mm is attached to the same pillar 4 as in Example 1 at an acute angle by using it. That is, in FIG. 2, the connection auxiliary member 9 is the pillar 4 and the beam 12 is the bolt 1
It is attached with 0, 11 and nuts 13, 13 and serves as a connection. Bolt 1 in connection auxiliary material 9
Both surfaces to which 0 and 11 are attached form the same angle as the crossing angle formed by the pillar 4 and the beam 12, and the thickness is 6
mm. The other two sides are parallel and each has a thickness of 10 mm.
The length of the long side in the cross section is about 150 mm, and the short side is 75 mm.

[0024]

Example 3 5 parts of calcium carbonate powder having an average particle diameter of 2 μm and 1.5 parts of zinc stearate as a mold release agent were added to 100 parts of an It-based unsaturated polyester containing propylene glycol isophthalate as a main component. The viscosity of the liquid is 25 ℃
It was 1950 CPS. Perroyl TCP (manufactured by NOF CORPORATION) and Perbutyl Z as curing agents in the liquid
(Manufactured by Nippon Oil & Fats Co., Ltd.) was added at a rate of 1% to prepare a pulling molding liquid for pultrusion molding. A mold having a total length of 1 m consisting of an outer mold and a core mold was molded by holding the first half at 135 ° C. and the second half at 145 ° C., and cutting it to a length of 100 mm to obtain a connection aid 14.

An effective flange width of 30 mm, a total height of 100 mm and a total height of 100 mm, and a fiber reinforcement 14 having the same sectional shape as in FIG.
mm From the end of the flange to the other end is 100 mm and the total height is 80 mm
1 is a fiber reinforcement having a cross-sectional shape of FIG.
FIG. 5 shows a state in which a joint is formed by using the connection auxiliary member 14 shown in FIG. That is, the drawing shows a connection auxiliary member 14 having planes intersecting at right angles and having a pentagonal cross section attached to a column 4 and a beam 15 with bolts 16 and 17 and nuts 18 and 18. Since these bolts are present opposite to the center lines of the columns 4 and the beams 15 in the lengthwise direction, eight bolts were used for mounting the connection auxiliary member 14 and one. The cross-section lengths of the surfaces of the connection auxiliary member 14 in contact with the columns 4 and the beams 14 are about 100 mm, and the cross-section wall thickness is 10 mm.

[0026]

According to the present invention, when a fiber-reinforced columnar material (column, beam) or the like is joined, a fiber-reinforced cylindrical material (connection auxiliary material) is interposed in the joint portion of the fiber-reinforced columnar material. Since the fiber-reinforced tubular material is tightened and fixed with bolts and nuts (fiber-reinforced material), it is possible to obtain a joint which is homogeneous and strong and has high reliability in strength. Further, since the fiber-reinforced tubular material is configured to have at least two connecting contact surfaces at a predetermined angle on the outer wall, it is possible to accurately maintain the contact angle of the columnar member and the like, and to make close contact with the contact surface. There is an effect that a strong joint can be configured.

Further, since the fiber reinforced tubular material is formed by cutting a long hollow pultruded product into slices, it has high strength reliability and can be mass-produced relatively inexpensively.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment in connection of a joint according to the present invention.

FIG. 2 is a partial cross-sectional view of another embodiment of the same.

FIG. 3 is a partial cross-sectional view of another embodiment of the same.

FIG. 4 is a view showing a cross section of the drawn tubular material as well, (a)
I section view, (b) II section view, (c) U section view, (d) Square section view, (e) L section view,
(F) Gate-shaped cross-sectional view, (g) External square, inner rectangular cross-sectional view.

[Explanation of symbols]

 1 Glass Roving 2 Glass Fiber Mat 3 Cylindrical Molded Product 4 Pillars 5, 12, 15 Beams 6, 9, 14 Connection Auxiliary Materials 7, 10, 11, 16, 17 Bolts 8, 13, 18 Nuts

Claims (3)

[Claims] 1. An end face of one of the two fiber-reinforced columnar members is abutted against the other end face at a predetermined angle, and a connection auxiliary member is interposed in the abutting joint portion to form the two ends of the two fiber-reinforced columnar members. In a connection method for fixing a columnar member and a connection auxiliary member, the connection auxiliary member is a cylindrical member, and one surface of an outer wall of the cylindrical member is brought into contact with a tightening surface of the one columnar member, and The surface of the columnar member is brought into contact with the tightening surface of the other columnar member, and the columnar member and the tubular member of each of the close contact portions are clamped and fixed by bolts and nuts, respectively. How to connect. 2. A connection auxiliary material for a joint portion of a fiber-reinforced columnar material, which is a fiber-reinforced cylindrical material having at least two connecting contact surfaces on the outer wall at a predetermined angle. 3. The connection auxiliary material for a joint portion of a fiber-reinforced columnar material according to claim 2, wherein the fiber-reinforced tubular material is formed by cutting a long hollow pultruded product into slices.