JP5419013B2 - Joining structure, composite material, and joining method - Google Patents

Description

  The present invention relates to a joining structure of a wood-based member and a steel plate, a composite material, and a joining method.

  Timber has been used as a representative building material in Japan for a long time, and in recent years there has been an increase in demand for active use of wood again due to consideration for environmental issues. However, when using wood as a structural member, it is necessary to consider variations in material strength, weak joints, and restrictions on distribution dimensions caused by the characteristics of wood, such as the inclination of nodes and fibers.

  In order to compensate for these disadvantages, there has been proposed a composite material in which a steel plate is sandwiched between wooden members such as wooden members or laminated materials and bolts are inserted and fastened (see, for example, Patent Document 1). In addition, in order to add sufficient proof stress, a frictional shear member is inserted into the bolt insertion hole, and a presser member is disposed outside each wooden member, so that the contact surface between the bottom surface of the shear member and the steel plate for bonding Some have been proposed to ensure the pressure (see, for example, Patent Document 2 and Non-Patent Document 1).

  On the other hand, by arranging wooden members around the shape steel, such as H-shaped steel and I-shaped steel, the strength as a structural member of the wooden building is secured, and other wooden members such as flooring are directly nail. There has also been proposed one that can be joined by (see, for example, Patent Document 3).

JP 2003-239453 A JP 2006-002556 A JP 2009-197455 A

Hiroyasu Sakata et al., Axial Characteristics of Sugi-steel Hybrid Equipment Using Friction Bonded Connectors, Architectural Institute of Japan, 627, pp811-817, 2008

  However, in the case of the techniques described in Patent Document 2 and Non-Patent Document 1, the joining structure becomes complicated as the shear member is inserted, which is disadvantageous economically. Moreover, in the technique described in Patent Document 3, the use of the shape steel increases the weight of the steel material sandwiched between the wooden members, resulting in high costs. Furthermore, in the case of the technique described in the above-mentioned Patent Document 1, due to the unique properties of wood-based members such as nodes and fiber inclination, variation in material strength occurs in the wood-based members. Simply tightening may not stabilize the yield strength of the joint structure and may change over time.

  Therefore, the present inventor has compressed a composite material in which a steel plate is sandwiched between wooden members in order to examine how much tightening is preferable. As a result, it was greatly disappointing that it would break as the compressive strain increased, and as shown in FIG. 4, the finding that the stiffness increased exponentially after the compressive strain exceeded 50%. Got.

  The present invention has been made based on the above knowledge, and provides a joining structure, a composite material, and a joining method of a wood-based member and a steel plate, which can ensure a stable yield strength with a simple configuration at low cost. With the goal.

The present invention employs the following means in order to solve the above problems.
The joining structure according to the present invention includes a steel plate, a first wood member disposed on one surface of the steel plate, and the first wood member sandwiched between the steel plates on the other surface of the steel plate. A second wood member disposed in an opposing position, and a fastening member that is inserted through the first wood member and the second wood member in the thickness direction of the steel plate and presses and fixes them to the steel plate And the fastening member comprises a high-strength bolt and a nut fastened to the high-strength bolt, and compressive strain of the first wood member and the second wood member by the fastening member Is 50% or more and 80% or less.

  In the joining method according to the present invention, the first wooden member is disposed on one surface of the steel plate, and the first wooden member is opposed to the other surface of the steel plate with the steel plate interposed therebetween. An arrangement step of arranging the second wood member at a position, and inserting and tightening a high-strength bolt in the thickness direction of the steel plate to the first wood member and the second wood member, and fastening them with the steel plate A fastening step for fixing by crimping, wherein the fastening step is performed so that the compressive strain of the first wood member and the second wood member is 50% or more and 80% or less. .

  The present invention provides a steel plate and a first wood-based member with a high-strength bolt having a high clamping force so that the compressive strain of the first wood-based member and the second wood-based member is 50% or more and 80% or less. And the 2nd wood system member is clamped and joined. Therefore, it is possible to greatly reduce the porosity of the joint portion between the first wood member and the second wood member, support a high pressure after deformation, and maintain rigidity even if there is a variation in material strength before compression. Can be raised and joined.

  Moreover, the joining structure which concerns on this invention is the said joining structure, Comprising: The said high strength bolt is a torcia type high strength bolt, It is characterized by the above-mentioned.

  According to the present invention, it is possible to visually confirm that the bolt is fastened with a predetermined tightening force, and it is possible to easily manage the tightening torque.

  Moreover, the joining structure which concerns on this invention is the said joining structure, Comprising: The counterbore part in which the head or the said nut of the said high strength volt | bolt is accommodated is a said 1st wood type member and a said 2nd wood type member It is arranged in.

  According to the present invention, the compression amount of the first wood member and the second wood member and the bolt tightenable length can be suitably adjusted according to the depth of the counterbore hole.

  Moreover, the joining structure which concerns on this invention is the said joining structure, Comprising: The fastening direction of the said fastening member and the fiber direction of said 1st wood type member and said 2nd wood type member cross | intersect, It is characterized by the above-mentioned.

  The present invention can increase the rigidity in the orthogonal direction of the wood fibers of the first wood member and the second wood member, and preferably the compressed state after the deformation of the first wood member and the second wood member. The rigidity can be maintained.

  The composite material according to the present invention includes the joining structure according to the present invention, the steel plate has a longitudinal direction and a plate width direction orthogonal to each other, and the first wood material member and the second wood material member are made of the steel plate. It is arranged on both end sides in the plate width direction.

  According to the present invention, the composite material can have a cross-sectional shape similar to that of a shape steel such as H-shaped steel, and the rigidity of the steel plate can be increased. Moreover, the usage-amount of steel materials can be reduced compared with H-section steel, and an inexpensive thing can be provided. Furthermore, it is possible to join the other wood-based member, the first wood-based member, and the second wood-based member with nails while maintaining a higher proof strength than that of a normal wood-based beam member.

  ADVANTAGE OF THE INVENTION According to this invention, in the joining of a steel plate and a wooden material member, the stable yield strength can be ensured with a simple structure at low cost. Moreover, since the wood-based member used in the present invention is thin and short, thinned wood such as shrubs and cedars that have been cut in the Tama region without being used much as main wood can be used. Therefore, even in a situation where it is becoming difficult to obtain imported timber, a new composite material of a wood-based member and a steel plate can be provided.

It is a perspective view which shows the composite material which concerns on one Embodiment of this invention. It is II-II sectional drawing of FIG. It is sectional drawing which shows the fastening state in the fastening process of the joining method which concerns on one Embodiment of this invention. It is a graph which shows the relationship between the load and distortion degree of the wood type member which concerns on one Embodiment of this invention. It is sectional drawing which shows the other example of the junction structure which concerns on one Embodiment of this invention. It is a graph which shows the shear test result of (a) joining structure (b) comparative example which concerns on one Embodiment of this invention.

An embodiment according to the present invention will be described with reference to FIGS.
The composite material 1 according to the present embodiment includes a joining structure 10 as shown in FIGS. 1 and 2.

  That is, the joint structure 10 includes a steel plate 11, a first wood member 12 disposed on one surface 11A of the steel plate 11, and a first wood system sandwiching the steel plate 11 between the other surface 11B of the steel plate 11. And a second wood-based member 13 disposed at a position facing the member 12, and has a cross-sectional structure similar to that of the H-section steel. The joining structure 10 includes a fastening member 15 that is inserted through the first wood member 12 and the second wood member 13 in the plate thickness direction X of the steel plate 11 and presses and fixes them to the steel plate 11.

  The steel plate 11 has a longitudinal direction Y and a plate width direction Z that are orthogonal to each other. The fastening member 15 includes a high-strength bolt 16, a nut 17 that is screwed with the high-strength bolt 16, and a washer 18. In the plate thickness direction X of the steel plate 11, a first through hole 20a into which the bolt portion of the high strength bolt 16 is inserted is arranged.

  The 1st wood system member 12 and the 2nd wood system member 13 are square members using thinning materials, such as cedar, and the 2nd penetration hole 20b in which the bolt part of high strength bolt 16 is inserted is arranged in the fastening direction. . And the counterbore 20c in which the head 16A of the high strength bolt 16 and the nut 17 are accommodated with the washer 18 is arranged on the surface with a predetermined depth. The second through hole 20b is preferably in a direction orthogonal to the fiber direction of the first wood member 12 and the second wood member 13. In addition, the 1st wood type member 12 and the 2nd wood type member 13 may be a wooden material or a laminated material.

  The first wood member 12 and the second wood member 13 are accommodated in the counterbore 20c so that the compressive strain is 50% or more and 80% or less, more preferably 70% to 80%. The washer 18 is tightened so as to be recessed.

  In the composite material 1, the first wood system member 12 and the second wood system member 13 are arranged on both end sides in the sheet width direction Z of the steel plate 11. At this time, both end surfaces 11C of the steel plate 11 in the plate width direction Z and the surfaces of the first wooden member 12 and the second wooden member 13 are arranged on the same plane.

Next, the joining method according to this embodiment will be described.
This joining method includes an arrangement step and a fastening step.

  In the arranging step, the first wood member 12 is arranged on one surface 11A of the steel plate 11 so that the first through hole 20a and the second through hole 20b communicate with each other. Similarly, the second surface 11B of the steel plate 11 is secondly positioned at a position facing the first wooden member 12 so that the first through hole 20a and the second through hole 20b communicate with the steel plate 11 therebetween. A wood-based member 13 is disposed.

  As shown in FIG. 3, the fastening process includes inserting a high-strength bolt 16 into the second through hole 20 b of the first wood member 12 and the second wood member 13 and fastening the nut 17. These are fixed to the steel plate 11 by being crimped into the first wood member 12 and the second wood member 13.

  Here, FIG. 4 shows the result of compressing the composite material in which the steel plate is sandwiched between the wooden members in order for the inventor to examine how much tightening is preferable when the steel plate is sandwiched between the wooden members. It is. The expectation that the composite material would break due to the compression of the composite material was greatly deviated, and as shown in FIG. 4, from the point where the compression strain exceeded 50%, the knowledge that the stiffness increased exponentially was obtained. . In this way, as the wood is compressed, the compression strain starts to increase from around 50%, and when it exceeds 70%, the rigidity becomes the same as the initial rigidity, and the proof stress continues to increase. Tightening is performed so that the compressive strain of the single wood member 12 and the second wood member 13 is 50% or more and 80% or less, and preferably 70% to 80%.

  When the length of the composite material 1 is insufficient, another composite material 1 may be connected to each other at the steel plate 11 portion and added in the length direction to secure a long one.

  According to the composite material 1 and the joint structure 10, the steel plate 11 and the first wood system are so arranged that the compressive strain of the first wood system member 12 and the second wood system member 13 is 50% or more and 80% or less. The member 12 and the second wood system member 13 are joined. Therefore, the porosity of the joining part of the 1st wood system member 12 and the 2nd wood system member 13 can be reduced significantly, and even if there is variation in material strength before compression, it can be joined with increased rigidity. . And a high pressure can be supported after a deformation | transformation and the fluctuation | variation of a yield strength can be suppressed suitably.

  In particular, since it is fastened with a high-strength bolt having a high tightening force, the first wood system member 12 and the second wood system member 13 can be compressed until the above-described compression strain is reached.

  Moreover, since the counterbore 20c in which the head 16A or the nut 17 of the high strength bolt 16 is accommodated is disposed in the first wood member 12 and the second wood member 13, the counterbore 20c By adjusting the depth, the compression amount of the first wood system member 12 and the second wood system member 13 and the tightenable length of the high strength bolt 16 can be suitably adjusted.

  Furthermore, when the fastening direction of the fastening member 15 and the fiber directions of the first wood member 12 and the second wood member 13 are crossed, the wood fibers of the first wood member 12 and the second wood member 13 The rigidity in the orthogonal direction can be increased, and the compressed state after deformation of the first wood member 12 and the second wood member 13 can be suitably maintained to maintain the rigidity.

  Moreover, the composite material 1 can be made into the same cross-sectional shape as shape steels, such as H-section steel, and the rigidity of the steel plate 11 can be improved. Moreover, the usage-amount of steel materials can be reduced compared with H-section steel, and an inexpensive thing can be provided. Furthermore, it is possible to join the other wooden members, the first wooden member 12 and the second wooden member 13 with a nail while maintaining a higher proof strength than a normal wooden member.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, instead of the high-strength bolt 16 and the nut 17 as the fastening member 15, a torcia bolt 21 may be used as shown in FIG. In this case, the completion of tightening of the bolt can be visually confirmed by the breakage of the pin tail 22 as shown in FIGS. 5 (b) to 5 (c). Further, since the breaking strength of the pin tail 22 is constant, the tightening axial force can be stabilized and the torque check at the completion of tightening can be omitted.

  Moreover, the some 1st wood type member and the 2nd wood type member may be arranged with respect to the long steel plate in the state spaced apart to the longitudinal direction.

  Furthermore, it is arranged so that both end faces 11C in the plate width direction Z of the steel plate 11 and the surfaces of the first wood system member 12 and the second wood system member 13 are on the same plane, but not limited thereto, You may distribute | arrange so that any one of the 1st wood type member 12, the 2nd wood type member 13, and the steel plate 11 may protrude with respect to the other.

  Moreover, by adjusting the lengths of the first wood member 12 and the second wood member 13 with respect to the sheet width direction Z of the steel plate 11, the resistance of the composite material 1 and the fire resistance performance of the steel plate 11 are suitably adjusted. Can do.

  About the joining structure 10 which concerns on this embodiment, when the board width direction Z of the steel plate 11 was made into the perpendicular direction, the upper 1st wood type member 12 and the lower 2nd wood type member 13 were each pressed to the perpendicular direction. Load [N] and 1/2 of the sum of the deviations of the first wood member 12 and the steel plate 11 and the second wood member 13 and the steel plate 11 are defined as the average deviation [d], and the average deviation [d ] And the load [N] were confirmed by a test. At this time, a similar shear test was performed using a conventional structure as described in Patent Document 2 as a comparative example. The shear test results are shown in FIG.

  It turned out that the joining structure 10 which concerns on this embodiment has the inclination of secant rigidity larger than a comparative example, and has high tolerance.

DESCRIPTION OF SYMBOLS 1 Composite material 10 Joining structure 11 Steel plate 11A One surface 11B The other surface 12 1st wood system member 13 2nd wood system member 15 Fastening member 16 High strength bolt 16A Head 17 Nut 20c Counterbore part X Thickness direction Y Longitudinal direction

Claims (9)

Steel sheet,
A first wood-based member disposed on one surface of the steel plate;
A second wood-based member disposed at a position facing the first wood-based member on the other surface of the steel plate with the steel plate interposed therebetween;
A fastening member that is inserted through the first wood member and the second wood member in the plate thickness direction of the steel plate, and press-fixes these and the steel plate,
With
The fastening member is a high-strength bolt;
A nut fastened to the high-strength bolt;
With
The joint structure, wherein the compression strain of the first wood member and the second wood member by the fastening member is 50% or more and 80% or less.   The joining structure according to claim 1, wherein the high-strength bolt is a Torcia-type high-strength bolt.   The counterbore hole part in which the head of the said high strength volt | bolt or the said nut is accommodated is distribute | arranged to the said 1st wood type member and the said 2nd wood type member, The Claim 1 or 2 characterized by the above-mentioned. Bonding structure.   The joining structure according to any one of claims 1 to 3, wherein a fastening direction of the fastening member intersects with a fiber direction of the first wood member and the second wood member. The bonding structure according to any one of claims 1 to 4, comprising:
The steel plate has a longitudinal direction and a plate width direction orthogonal to each other, and the first wood member and the second wood member are arranged on both ends in the plate width direction of the steel plate. Wood. The first wood member is disposed on one surface of the steel plate, and the second wood member is disposed on the other surface of the steel plate at a position facing the first wood member with the steel plate interposed therebetween. An arrangement process to
Fastening a high-strength bolt in the plate thickness direction of the steel plate to the first wood member and the second wood member and fastening them, and fastening these to the steel plate,
With
In the fastening process, the first wood member and the second wood member are fastened so that the compressive strain is 50% or more and 80% or less.   The joining method according to claim 6, wherein the high-strength bolt is a Torcia-type high-strength bolt.   The counterbore hole portion in which a head of the high-strength bolt or a nut fastened to the bolt is accommodated is arranged in the first wood member and the second wood member. The joining method according to 6 or 7. The joining method according to any one of claims 6 to 8, wherein a fastening direction of the fastening member intersects with a fiber direction of the first wood member and the second wood member.

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