JP7373962B2 - Pin joint structure and metal plate used in this pin joint structure - Google Patents

Description

The present invention relates to a pin joining structure that can join pieces of wood together, for example, without using a tenon or a battledore, and a metal plate used in this pin joining structure.

As shown in FIG. 11, for example, as a joining structure for joining a wooden pillar 101 and a wooden beam 102, a base 103a of a metal plate 103 is fixed to the pillar 101 with screws, and a protruding plate part of the metal plate 103 is fixed to the pillar 101 with screws. Insert the slit portion 102a formed on the end side of the beam 102 into 103b, and align the through hole 103c formed on the protruding plate portion 103b and the through hole 102b formed on the end side of the beam 102. A pin joining structure 100 is known in which a drift pin 104 is driven through these through holes 102b and 103c.

Note that Patent Document 1 discloses a pin joint structure that joins a pillar and a beam fixed to the upper surface or lower surface of the pillar.

Incidentally, the deformation/destruction properties of pin joint structures under tensile load can be roughly divided into the following three types.
(1) Bending deformation of drift pin (does not result in destruction)
(2) Splitting or tensile failure of wood members (brittle)
(3) Tensile yield and tensile fracture of steel metal plates (almost not fracture)

In a typical pin joint structure, the deformation performance of the pin joint structure is ensured by the above (1), which often ultimately leads to the failure of the above (2). In this case, the variation in the deformation/destruction properties described in (2) above is large, and the performance evaluation is often underestimated.

Japanese Patent Application Publication No. 2018-53499

On the other hand, in a design in which the above (3) is destroyed first, the metal plate is deformed only in a small area around the drift pin on the joining side (load force side), so that the deformation performance cannot be expected to be very good.

In view of the above circumstances, the present invention provides a pin joint structure and a metal plate in which high deformation performance can be obtained in the metal plate even if the pin joint structure is designed to undergo tensile yield and breakage of the metal plate first.

In order to solve the above problems, the pin joint structure of the present invention includes a first through hole formed in the metal plate, and a second through hole formed in an arrangement corresponding to the arrangement of the first through hole. The metal plate is stacked on a structural material, and a pin is inserted through the first through hole and the second through hole, the pin being located at one end side of the first through hole. , a space is formed between the side surface of the pin and the other end side of the first through hole by elongating the first through hole in the direction of the end surface of the structural material that joins with another member, and the space The length is 10 mm or more and 150 mm or less.

With the above configuration, by forming the space in the first through hole, stress is widely distributed at the peripheral edge of the first through hole, increasing the deformation area, and improving deformation performance as a whole. do. That is, high deformation performance can be obtained even with a design in which the above-mentioned tensile yielding and destruction of the metal plate is preceded.

When a plurality of first through holes and a plurality of second through holes are respectively formed in the direction of an end surface of the structural material that joins to another member, the first through hole located closest to the end surface among the first through holes It is preferable that the space is formed in the through hole. That is, when a tensile load is generated, the first through hole corresponding to the pin at the outermost edge has the above-mentioned space, so that deformation performance after yielding can be efficiently ensured.

The mutually facing hole edges of the first through-holes forming the space may extend parallel to each other in the direction of the end surfaces to be joined, or may extend non-parallel to each other in the direction of the end surfaces to be joined.

Further, in the metal plate of the present invention, the first through hole used in the pin joint structure is formed. This metal plate may have a joint surface portion for joining with the other member at the end on the side where the space is formed.

The present invention has the effect that high deformation performance can be obtained in a pin-jointed structure even if the tensile yielding and destruction of the metal plate is preceded.

FIG. 3 is a perspective view showing the pin joint structure of this embodiment. FIG. 1A is an explanatory diagram showing the arrangement relationship of the steel plates and drift pins used in the pin joint structure of FIG. 1, and FIG. 1B is an explanatory diagram of the spatial length. It is a perspective view showing the pin joint structure of other embodiments. FIG. 4 is an explanatory diagram showing the arrangement relationship of a steel plate and a drift pin used in the pin joint structure of FIG. 3. FIG. FIG. 4 is an explanatory diagram illustrating locations where the pin joint structure of FIG. 1 and the pin joint structure of FIG. 3 are used in a building. It is a graph showing the relationship between displacement and load between a normal round through hole formed in a steel plate and a long through hole according to an embodiment, obtained by finite element analysis. The same figure (A) is an explanatory diagram showing the difference in stress at each location when a round through hole is formed in a steel plate, and the same figure (B) is an explanatory diagram showing the difference in stress at each location when a round through hole is formed in a steel plate, and the same figure (B) is an explanatory diagram showing the difference in stress at each location when a round through hole is formed in a steel plate. FIG. 2 is an explanatory diagram showing the difference in stress at each location when a long through hole is formed in a steel plate using the depth of color. It is a figure which shows embodiment, Comprising: It is an explanatory view showing an example of a long hole through-hole formed in a steel plate. It is a figure which shows embodiment, Comprising: It is explanatory drawing which showed the other example of a through-hole formed in a steel plate. Figure (A) is a dimensional diagram of a metal plate targeted for finite element analysis, and Figure (B) is an explanatory diagram showing the applied conditions. FIG. 2 is a perspective view showing a conventional pin joint structure.

Embodiments of the present invention will be described below based on the accompanying drawings.
As shown in FIG. 1, the pin joint structure 10 of this embodiment is used, for example, as a joint structure for joining a wooden beam 1 and a wooden bundle 2 provided on the upper surface thereof.

A steel plate (metal plate) 3 is attached to the upper surface of the beam 1. This steel plate 3 is provided with a joint surface portion 3a for joining the bundle 2, which is a structural member, with another member (in this example, the beam 1), and has a through-hole formed in the joint surface portion 3a. The steel plate 3 is fixed to the beam 1 by screwing the screw 5 into the hole. Further, the steel plate 3 includes a protruding plate portion 3b that protrudes upward from the joint surface portion 3a. The joint surface portion 3a and the protruding plate portion 3b are fixed to each other by, for example, welding. The protruding plate portion 3b has, for example, four first through holes 3c, two in the direction of the end surface to be joined to the beam 1 (other member) in the bundle 2, and two in the direction of the end surface to be joined to the beam 1 (other member). It is formed in two rows and two columns in the direction.

A slit 2a into which the protruding plate portion 3b is inserted is formed at the end of the bundle 2. Further, four second through holes 2b are formed on the end side surface of the bundle 2 so as to cross the slit 2a in the same arrangement as the first through holes 3c. Insert the protruding plate portion 3b into the slit 2a, align the first through hole 3c and the second through hole 2b, and pass through the first through hole 3c and second through hole 2b to form four holes. A metal drift pin 4 is driven in.

As shown in FIG. 2A, among the two first through holes 3c lined up in the direction of the end surface of the bundle 2 that joins the beam 1, the first through hole 3c is located closest to the end surface of the bundle 2. The through-hole 3c is a first through-hole 3c(L) in the shape of an elongated hole whose facing edges extend parallel to each other in the direction of the end surface of the bundle 2 (the direction approaching the joint surface portion 3a).

The two drift pins 4 closest to the end surface of the bundle 2 are located on one end side (the side far from the joint surface portion 3a) of the first through hole 3c(L), and Since the first through hole 3c(L) is long in the direction of the end surface of the bundle 2 that joins with the beam 1, the first through hole 3c(L) is extended from the peripheral surface (side surface) of the drift pin 4 to A space G is formed between the end sides. That is, the first through hole corresponding to the drift pin located at the outermost edge when a tensile load is generated has the space G.

Further, as shown in FIG. 2(B), the length L of the space G, that is, on the center line that is parallel to the longitudinal direction of the first through hole 3c (L) and passes through the center of the drift pin 4. The length L from point P1 on the circumferential surface of the drift pin 4 to point P2 on the center line on the other end side of the first through hole 3c(L) is 10 mm or more and 150 mm or less, preferably From the viewpoint of increasing the deformation area of the steel plate 3, it is preferably 20 mm or more, more preferably 30 mm or more. On the other hand, the length L of the space G is determined based on the fact that the deformation length is 30 mm or less when evaluating the load deformation of general wooden joints, and that the elongation performance of the steel material is 20% or more and the compression Considering the stability (buckling prevention) of the steel plate during operation, etc., the thickness is preferably 120 mm or less, and more preferably 100 mm or less.

In the above example of the shape of the first through hole 3c(L), the center of the drift pin 4 located on one end side (the side far from the joint surface portion 3a) of the first through hole 3c(L) and the first through hole 3c(L) are connected to each other. The distance between the centers of the drift pins 4 virtually located on the other end side (the side closer to the joint surface portion 3a) of the first through hole 3c(L) corresponds to the length L of the space G.

Further, the beam 1 may be a concrete foundation beam. In this case, the number of through holes formed in the joint surface portion 3a (in the example of FIG. 1, the screws 5 are provided) is, for example, four, and the anchor bolts protruding from the upper surface of the concrete foundation beam are inserted into these through holes. is inserted, and the joint surface portion 3 is fixed to the upper surface of the concrete foundation beam using a nut (not shown). Further, the joint surface portion 3a is not a flat plate, but has a structure in which a flat plate is attached to a cross-shaped vertical plate portion standing between the four through holes of the joint surface portion 3a, and the protruding plate portion 3b is provided on this flat plate. Good too.

Next, a pin joint structure 10A of another embodiment is shown in FIG. This pin joint structure 10A is used, for example, as a joint structure for joining a wooden column 11 and a wooden beam 12.

A steel plate 13 is attached to the top of the pillar 11. This steel plate 13 includes a joint surface (base) 13a for joining the beam 12 with another member (in this example, the column 11), and has a through hole formed in the joint surface 13a. The steel plate 13 is fixed to the column 11 by screwing the screw 15 into the column. Further, the steel plate 13 includes a protruding plate portion 13b that protrudes in the horizontal direction from the joint surface portion 13a. The protruding plate portion 13b has, for example, eight first through holes 13c, two in the direction of the end surface of the beam 12, which is a structural member, that joins with the column 11 (other member), and two holes in the direction of the end surface that joins with the column 11 (other member). They are formed in four rows and two columns in a direction perpendicular to the direction.

A vertical slit 12a into which the protruding plate portion 13b is inserted is formed on the end side of the beam 12. Furthermore, eight second through holes 12b are formed on the end side surface of the beam 12 so as to cross the slit 12a in the same arrangement as the first through holes 13c. The protruding plate portion 13b is inserted into the slit 12a, the first through hole 13c and the second through hole 12b are aligned, and the first through hole 13c and the second through hole 12b are penetrated. A book drift pin 14 is driven in.

As shown in FIG. 4, among the two first through holes 13c lined up in the direction of the end surface of the beam 12 that joins the pillar 11, the first through hole 13c located closest to the end surface of the beam 12 is The edges of the holes facing each other form elongated first through holes 13c(L) extending parallel to each other in the direction of the end face of the beam 12 (the direction approaching the joint surface portion 13a).

The four drift pins 14 closest to the end surface of the beam 12 are located on one end side (the side far from the joint surface portion 13a) of the first through hole 13c(L), and Since the first through hole 13c(L) is long in the end surface direction of the beam 12, there is a space G between the peripheral surface (side surface) of the drift pin 14 and the other end side of the first through hole 13c(L). is formed. The length of the space G is the same as the length L exemplified in the previous embodiment.

FIG. 5 illustrates a location in a building 50 to which the pin joint structures 10 and 10A are applied. The above-mentioned pin joint structure 10 is suitable for a joint part (A location) that receives an axial tensile and compressive force such as a column, a bundle, a truss, etc. On the other hand, the above-mentioned pin joint structure 10A can be used at a column-beam joint, etc. (location B) that receives bending rigidity. At each location, it is required to ensure not only initial rigidity but also secondary toughness.

Figure 6 is a graph showing the results calculated using finite element analysis regarding the relationship between displacement and load when the same load is applied to the through holes formed in the steel plate due to differences in the shape of the through holes. It is. Table 1 shows the material information of the steel plate that is the analysis target in this finite element analysis, and Table 2 shows the dimensions of each part of the steel plate. In addition, Fig. 10(A) shows the numbers of the dimensions of each part of the steel plate and the through hole corresponding to Table 2, and Fig. 10(B) shows the conditions for applying force to the steel plate and the through hole. There is. This application condition indicates that force is applied to one end side of the steel plate (the side to be joined to another member) and the arcuate edge of the through hole that is far from the one end side. In addition, the yield condition is assumed to be Von Mises.

Furthermore, Fig. 7 is an explanatory diagram showing the difference in stress values occurring at the peripheral edge of a through hole in a steel plate by color density, based on the results calculated by the above finite element analysis. It is shown that the lighter the color, the higher the stress value, and the lighter the color, the lower the stress value. FIG. 7(A) shows a case where a round through hole is formed in a steel plate, and FIG. 7(B) shows a case where a long through hole is formed in a steel plate. From these figures, it can be seen that when long through holes are formed in the steel plate 13, stress is widely distributed around the first through holes 3c (L) and 13c (L), and the deformation area increases. I understand.

According to the pin joint structure 10, 10A, the space G is formed in the first through hole 3c(L), 13c(L), so that the first through hole 3c(L), 13c(L) The stress is widely distributed around the area and the deformation area increases, which improves the deformation performance as a whole. That is, high deformation performance can be obtained even when the steel plate is designed to undergo tensile yielding and destruction in advance.

In the above example, when a plurality of the first through holes 3c, 13c and the second through holes 2b, 12b are formed in the direction of the end surface of the bundle 2 and the beam 12, which are structural members, to be joined to other members, respectively. , among the first through holes 3c and 13c, the space G was formed in the first through holes 3c(L) and 13c(L) located closest to the end surfaces of the bundle 2 and the beam 12; When one through hole 3c, 13c and one second through hole 2b, 12b are formed in the direction of the joining end surfaces of the bundle 2 and the beam 12, the one first through hole is a long hole. There are certain first through holes 3c(L) and 13c(L).

Further, in the above example, the first through holes 3c(L) and 13c(L) forming the space G are long holes extending parallel to the end surface direction of the bundle 2 and the beam 12, which are structural members. However, in such a long hole, as shown in FIG. The width may be narrower than the diameter of the portion, or the width may be wider than the diameter.

In addition to the elongated holes as described above, for example, as shown in FIG. It may be long and non-parallel to the end face direction.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope or equivalent scope of the present invention.

1: Beam (other parts)
2: Bundle (structural material)
2a: Slit 2b: Second through hole 3: Steel plate 3a: Joint surface portion 3b: Projecting plate portion 3c: First through hole (round hole)
3c(L): First through hole (long hole)
4: Drift pin (pin)
5: Screw 10: Pin joint structure 10A: Pin joint structure 11: Column (other parts)
12: Beam (structural material)
12a: Slit 12b: Second through hole 13: Steel plate 13a: Joint surface portion 13b: Projecting plate portion 13c: First through hole (round hole)
13c(L): First through hole (long hole)
14: Drift pin (pin)
15: Screw 50: Building G: Space

Claims (5)

A first through hole is formed in the metal plate, and the metal plate is stacked on a structural member in which a second through hole is formed in an arrangement corresponding to the arrangement of the first through hole. 2. A pin joint structure in which a pin is inserted through the through hole,
The pin is located on the arcuate edge of one end of the first through hole, and the first through hole is lengthened in the direction approaching the end surface of the structural material that joins with another member, so that the side surface of the pin and the first through hole are elongated. A space is formed between the other end of the through hole,
The length of the space is 10 mm or more and 150 mm or less ,
A pin joint structure characterized in that the pin contacts the arcuate edge on the one end side on a center line that is parallel to the longitudinal direction of the first through hole and passes through the center of the pin, and a load is applied to the arcuate edge. . In the pin joint structure according to claim 1, a plurality of the first through holes and a plurality of second through holes are each formed in a direction approaching an end surface of the structural material to be joined to another member, and the first through hole A pin joint structure characterized in that the space is formed in the first through hole located closest to the end surface. In the pin joint structure according to claim 1 or 2, the mutually facing hole edges of the first through holes forming the space extend parallel to each other in a direction approaching the end surface to be joined, or A pin joint structure characterized by extending non-parallel to each other in the direction approaching the end face. A metal plate in which the first through hole is formed and used in the pin joint structure according to any one of claims 1 to 3. 5. The metal plate according to claim 4, having a joint surface portion for joining with the other member at the end on the side where the space is formed.

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