JP5601515B2 - Structure for improving friction of wood materials - Google Patents

Description

  The present invention relates to a structure for improving the frictional force of a wood material.

Conventionally, traditional wooden buildings in Japan, represented by shrines and temples, etc., are mainly composed of wooden frames with pillars and pierces (see, for example, Patent Document 1).
As shown in FIGS. 18 and 19 (a), this type of wooden frame assembly is formed by stacking horizontally long strip-like wall plates 2 made of eaves, for example, in multiple stages between left and right pillars 1. In particular, the wall plate 2 is constructed by alternately assembling the through holes 2a and the force plates 2b. Further, as shown in FIG. 19B, the through-hole 2a is locked by fitting a wedge into a mortise 1a formed at both ends of the pillar 1 and the force plate 2b is fixed at both ends of the pillar 1. It is mounted in a state where it is simply inserted into the vertical groove 1b formed in the above.

  Further, wooden dowels 4 are interposed at predetermined intervals in the horizontal joint portions S formed between the wall plates 2, that is, between the through holes 2a and the force plates 2b. The relative displacement (lateral deviation) in the horizontal direction (lateral direction T1) between the wall plates 2 is regulated. The wooden dowel 4 is generally made of a highly rigid saddle or the like, and is processed into a prismatic shape or a square bar shape as shown in FIG.

  The plate wall 3 configured as described above receives a horizontal force that causes the column 1 to rotate in the direction of falling and to deform the wall plates 2 of each step so as to shift in the horizontal direction (lateral direction T1) during an earthquake. . On the other hand, the wooden dowel 4 has a tenacious deformation performance depending on the indentation strength, and the wooden shaft assembly has its upper and lower wall plates 2 (plate walls 3) restrained by the wooden dowel 4, so that Deformation is suppressed and excellent horizontal strength is demonstrated.

JP 2009-2042 A

  However, when the wooden dowel 4 is subjected to repeated loads (repeatedly receiving shearing force), it undergoes indentation deformation and collapses, and a gap is formed between the dowel holes and the restoring force characteristics (damping characteristics) slip. It will change to a natural resilience characteristic. That is, the Q-δ loop (load-displacement loop) representing the restoring force characteristic becomes a horizontally long pattern as a whole, and the hysteresis attenuation becomes small. For this reason, the wooden dowel 4 alone does not necessarily provide sufficient damping performance (seismic performance), and a technique for further improving damping performance is required, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and can be applied to the wooden frame as described above, and the frictional force of the wooden material that can improve the frictional force between the wooden materials with a simple structure. The object is to provide an improved structure.

In order to achieve the above object, the structure for improving the frictional force of the wood material according to the present invention is a structure for improving the frictional force of the wood material for improving the friction force between the wood materials, and the friction surface between the wood materials. A particulate material that is harder than the wood material is interposed, and a roughening portion is formed on the friction surface of at least one of the wood material, and the granular material has a particle size that can be bitten into a groove of the roughening portion. It is said.

  In the present invention, since particulate materials such as sand grains are interposed between the friction surfaces between the wooden materials, a relative displacement in the shear direction occurs between the wooden materials, and friction occurs between the contact surfaces (friction surfaces). When this occurs, the particulate material harder than the wood material is in a state of being engaged with and locked into the grain of the wood material. This locked granular material forms an irregular convex portion on the friction surface and becomes a frictional resistance, so that the friction coefficient on the friction surface between the wood materials can be increased. Moreover, even when a wooden material is subjected to repeated loads (repetitive shearing force) due to, for example, an earthquake, the friction between the granular material harder than the wooden material and the wooden material reduces the wear of the granular material. Stability can be improved.

  This makes it possible to apply the frictional force improving structure of the present invention to a wide range of joints, contact parts, or wood vibration control structures between wooden materials such as traditional wooden buildings as well as wooden buildings such as ordinary houses. It becomes.

  Further, in the frictional force improving structure of the present invention, the frictional force improving structure can be formed by a simple operation of spreading an appropriate amount of particulate matter such as sand grains on the friction surface of the wooden material. Simplification can be achieved.

Further, in this case, the particulate matter is easily bitten into the groove of the roughening portion formed on the friction surface of the wood material, and the attachment of the particulate matter to the friction surface is improved. For this reason, even when relative displacement occurs between the wood materials, since the locked state is ensured without the particulate matter rotating on the friction surface, the frictional force can be further increased.
And since the particulate matter is caught in the roughening portion, even when a load is repeatedly applied to the wood material, the particulate matter is not dispersed due to the movement and the quantity is not reduced. It can be maintained.
Further, the roughening portion for the wood material can be easily formed, for example, by marking with a sword mountain.
Furthermore, for example, by adopting a granular material having a particle size smaller than the groove width of the roughening portion, the granular material can be surely caught in the groove and locked.

  Moreover, in the frictional force improving structure for a wood material according to the present invention, it is preferable that the particulate matter is adhered to the friction surface.

In this case, since the particulate matter is attached to the friction surface of the wooden material and is in a locked state, even if relative displacement occurs between the wooden materials, the particulate matter is Since the locked state is ensured without rotating at, the frictional force can be further increased.
The adhesion of the particulate material can be easily formed by spraying the fixing agent on the particulate material by spraying, for example.

  According to the structure for improving the frictional force of the wood material according to the present invention, the particulate material harder than the wood material is caught in the grain of the wood material, etc. with a simple structure in which the particulate material is interposed on the surface of the wood. Since it becomes a stopped state and becomes a frictional resistance, the friction coefficient on the friction surface between the wood materials can be increased, and the frictional force can be improved.

It is a front view which shows the earthquake-resistant board wall structure provided with the frictional force improvement structure of the wooden material by embodiment of this invention. It is a disassembled perspective view of the earthquake-resistant board wall structure shown in FIG. FIG. 2 is an enlarged front view of the vibration control structure shown in FIG. 1, in which some wall plates are omitted. It is the X1-X1 sectional view taken on the line shown in FIG. It is the front view which shows the friction damping member which formed the wedge insertion groove | channel, a top view, and a side view. It is the X2-X2 sectional view taken on the line shown in FIG. It is a side view for demonstrating a frictional force improvement structure. It is a perspective view which shows the friction surface of a frictional force improvement structure. It is the figure which expanded the friction surface of the frictional force improvement structure shown in FIG. It is a front view which shows the state which the earthquake-resistant board wall structure received the horizontal force and deform | transformed. It is a side view which shows the structure of the friction test apparatus by an Example. It is a figure which shows the relationship between the load and displacement which were obtained by the friction test. It is a graph which is a result of a friction test and shows distribution of a static friction coefficient. It is a result of a friction test, Comprising: It is a graph which shows distribution of a dynamic friction coefficient. It is the result of a friction test, Comprising: It is the graph which compared the static friction coefficient. It is a photograph which shows the state before the test of the friction surface of the test piece in Test 7. FIG. It is a photograph which shows the state before the test of the friction surface of the test piece in Test 8. FIG. It is a front view which shows the conventional board wall structure (wooden frame). It is a perspective view which shows the conventional board wall structure (wooden frame).

  Hereinafter, a structure for improving the frictional force of a wood material according to an embodiment of the present invention will be described with reference to the drawings.

A seismic plate wall structure A shown in FIG. 1 is applied to a wooden frame of a wooden building, and includes a frictional force improving structure C of a wooden material according to the present embodiment. That is, the seismic plate wall structure A is formed by stacking horizontally long strip-like wall plates 2 made of eaves, for example, in multiple stages between the left and right pillars 1 as in the conventional plate wall 3. The plate 2b is assembled alternately.
Here, the frictional force improving structure C is a structure in which wood materials (the wall plate 2, the friction damping member 7, and the wedge 9 shown in FIG. 2) are in frictional contact with each other. B is incorporated.

  Further, the through hole 2a is locked by fitting a wedge into a mortise 1a formed at both ends of the pillar 1 and the force plate 2b is simply inserted into a longitudinal groove 1b formed at the both ends of the pillar 1. It is installed in the state. Further, wooden dowels 4 are interposed at predetermined intervals between the upper and lower adjacent wall plates 2 (2a, 2b), that is, in the horizontal joint portions S of each step between the through plate 2a and the force plate 2b. Yes.

  In addition, in the seismic plate wall structure A, in addition to the wooden dowel 4, a seismic control structure B that forms the above-described frictional force improving structure is provided in the horizontal joint portion S. This damping structure B includes a pair of fitting grooves 5 and 6 formed in a pair of upper and lower wall plates 2 adjacent to each other (a through 2a and a force plate 2b adjacent to each other in the vertical direction), a friction damping member 7, And a wedge 9 engaged with a wedge fitting groove 8 formed in the friction damping member 7.

  As shown in FIGS. 2 to 4, one first fitting groove 5 of the pair of opposing fitting grooves 5, 6 is recessed upward from the lower end of the upper wall plate 2 and extends in the lateral direction T <b> 1. It is formed into a shape. The other second fitting groove 6 is recessed downward from the upper end of the lower wall plate 2 and is formed in a square shape extending in the lateral direction T1. The pair of fitting grooves 5 and 6 are provided so as to communicate with each other in a state where the pair of upper and lower wall plates 2 (2a and 2b) are stacked and installed at predetermined positions. Furthermore, in the present embodiment, the first fitting groove 5 and the second fitting groove 6 are formed with substantially the same depth and thickness, and the first fitting groove 5 is the second fitting groove 6. The width (the length in the horizontal direction T1) is made larger than that.

As shown in FIGS. 4 to 6, the friction damping member 7 is made of wood and has a rectangular flat plate shape. The friction damping member 7 is formed to have a thickness substantially equal to the thickness of the first fitting groove 5 and the second fitting groove 6, and a width substantially equal to the width of the second fitting groove 6. It is formed with. The friction damping member 7 is provided by fitting the upper end side into the first fitting groove 5 and the lower end side into the second fitting groove 6 with the center in the height direction (vertical direction T2) as a boundary. . At this time, as shown in FIG. 4, the friction damping member 7 is installed so that the one surface 7a and the other surface 7b are in close contact with the inner surfaces 5a and 6a of the first fitting groove 5 and the second fitting groove 6, respectively. Has been.
That is, as described above, since the first fitting groove 5 is formed with a width larger than that of the second fitting groove 6, as shown in FIG. 3, the lateral direction T1 on the upper end side of the friction damping member 7 is used. On the outside, the friction damping member 7 is installed in a state where the gap H of the first fitting groove 5 in which the upper end side of the friction damping member 7 is not fitted is left.

  Further, as shown in FIGS. 4 to 6, the friction damping member 7 is formed with a wedge fitting groove 8 recessed inward from the end (upper end), and a wedge 9 such as a hell wedge is driven into the wedge fitting groove 8. The one surface 7a and the other surface 7b of the friction damping member 7 are in close contact with the inner surfaces 5a and 6a of the fitting grooves 5 and 6, respectively. In this case, the friction damping member 7 can be widened outward by driving the wedge 9 into the wedge fitting groove 8, and the one surface 7 a and the other surface 7 b of the friction damping member 7 are respectively formed in the first fitting groove 5. It becomes possible to make it closely adhere to the inner surface 5a.

  Here, as shown in FIGS. 3 and 6, the wedge 9 has a dimension in the lateral direction T <b> 1 longer than that of the friction damping member 7 and is driven into the wedge insertion groove 8 of the friction damping member 7. The width dimension fills the gap H outside the horizontal direction T1. Therefore, when a repeated load (repeated shearing force) is applied, the friction damping member 7 can be slid laterally within the first fitting groove 5 by the gap H, whereas the wedge 9 It will be fixed in one fitting groove 5.

Furthermore, the inner surface 5 a of the first fitting groove 5, both surfaces 7 a and 7 b of the friction damping member 7 engaged with the first fitting groove 5, the groove side surfaces 8 a and 8 b of the wedge fitting groove 8, and the side surface of the wedge 9. The frictional force improving structure C is formed on each of the friction surfaces K of 9a and 9b.
As shown in FIGS. 7 to 9, the frictional force improving structure C has a groove-shaped roughening portion 10 formed by scoring the friction surfaces K of both wood materials (here, reference numerals 5 and 7) with, for example, Kenzan. The sand 11 (particulate matter) harder than wood is dispersed (fixed) by the fixing agent 12 on the formed and roughened surface.

  The sanding amount of the sand 11 is not particularly limited, but is in a state of being uniformly dispersed over the entire surface of the predetermined region. As this sand 11, for example, standard sand (0.1 to 0.3 mm) such as Toyoura sand, shaving sand (0.63 mm) obtained by scraping sandpaper # 40, or the like can be used. The fixing agent 12 is a spray material having adhesiveness, and the sand 11 is fixed to the respective surfaces 7 a, 7 b, 8 a, and 8 b of the friction damping member 7 by being sprayed from above the sand 11.

  Next, the effect | action of the earthquake-resistant board wall structure A mentioned above is demonstrated based on drawing.

  As shown in FIG. 10, in the seismic plate wall structure A of the wooden building of the present embodiment, the friction damping member 7 is provided in addition to the wooden dowel 4, so that a repeated load (horizontal force, repeated shear) is generated during an earthquake. 4 and 6, friction is generated on the friction surface between the friction damping member 7 and the first fitting groove 5, and the friction between the friction damping member 7 and the wedge 9 is received. Effective relative deformation also occurs on the surface and friction is generated, and vibration energy (earthquake energy) is absorbed by these frictions. Thus, since the friction surface formed in the damping structure B doubles, it becomes possible to double the frictional force per location of the damping structure B.

  That is, in the seismic plate wall structure A, the friction damping member 7 is fitted into the horizontal grooves S of the pair of upper and lower wall plates 2 (2a, 2b) in the fitting grooves 5, 6 as well as the conventional wooden dowels 4. When the horizontal force due to the earthquake is received, the friction between the one surface 7a and the other surface 7b of the friction damping member 7 and the inner surface 5a of the fitting groove 5, and the wedge insertion groove 8 and the wedge 9 of the friction damping member 7 are provided. The vibration energy can be absorbed by the friction.

  In the present vibration damping structure B, the friction damping member 7 can be widened outward by driving the wedge 9 into the wedge fitting groove 8, and the one surface 7a and the other surface 7b of the friction damping member 7 are respectively set to the first one. It is possible to firmly adhere to the inner surface 5a of the fitting groove 5. Accordingly, vibration energy can be absorbed more reliably and effectively by friction between the one surface 7a and the other surface 7b of the friction damping member 7 and the inner surface 5a of the first fitting groove 5.

  Further, as shown in FIGS. 7 to 9, in the frictional force improving structure C, between the wood materials (that is, between the friction damping member 7 and the first fitting groove 5 shown in FIG. Since sand 11 is interposed on the friction surface between the wedge 9 and the wedge 9, relative displacement in the shear direction occurs between the wood materials, and friction occurs on the contact surfaces (friction surface K). Sand 11 that is harder than the wood material is in a state of being engaged with and locked in the wood of the wood material. The locked sand 11 forms an irregular convex portion on the friction surface K and becomes a frictional resistance, so that the friction coefficient on the friction surface K between the wood materials can be increased. Moreover, even when the wood material is subjected to repeated loads (repeated shearing force) due to, for example, an earthquake, the friction between the sand 11 and the wood material, which is harder than the wood material, reduces the wear of the particulate material. Stability can be improved.

  As a result, the friction force of the present invention can be widely improved as a joint part, a contact part, or a wood vibration control structure between wooden materials such as a traditional wooden building as in the present embodiment as well as a wooden building such as a general house. The structure can be applied.

  In addition, since the structure for improving the frictional force can be formed by a simple operation of spreading an appropriate amount of sand 11 on the friction surface K of the wooden material, it is possible to facilitate the construction work of a wooden building or the like.

Further, in the frictional force improving structure C of the present embodiment, the roughening portion 10 is formed on the friction surface K of the wood material, so that the groove of the roughening portion 10 formed on the friction surface K of the wood material is formed. Sand 11 becomes easy to bite, and attachment of sand 11 to friction surface K is improved. Therefore, even when relative displacement occurs between the wood materials, the engagement state is ensured without the sand 11 rotating on the friction surface K, so that the frictional force can be further increased.
And since the sand 11 is biting into the roughening part 10, even when a load is repeatedly applied to the wood material, the sand 11 is not dispersed by the movement and the quantity is not reduced, and this causes a high friction coefficient. Can be maintained.
Moreover, the roughening part 10 with respect to a wooden material can be easily formed, for example by scribbling with a sword mountain etc.

Furthermore, in the frictional force improving structure C, the sand 11 is fixed to the friction surface K by the fixing agent 12, that is, the sand 11 is fixed to the friction surface K of the wood material and is in a locked state. Even when relative displacement occurs between the wood materials, since the sand 11 does not rotate on the friction surface K and the locked state is ensured, the frictional force can be further increased.
Then, the fixing of the sand 11 with the fixing agent 12 can be easily formed by spraying the fixing agent on the particulate material by spraying, for example.

  Furthermore, for example, by adopting sand 11 having a particle diameter smaller than the groove width of the roughening portion 10, the sand 11 can be surely bitten into the groove by engaging with the groove of the roughening portion 10. Can be stopped.

  As described above, in the structure for improving the frictional force of the wood material according to the present embodiment, the sand 11 is placed on the surface of the wood between the friction damping member 7 and the first fitting groove 5 and between the friction damping member 7 and the wedge 9. Since the sand 11 harder than the wood material is engaged and locked in the grain of the wood material, etc., with a simple structure that can only be crushed and intervened, it becomes a frictional resistance, so the friction surface between the wood materials The coefficient of friction at K can be increased, and the frictional force can be improved.

[Example]
Next, examples carried out to support the effect of the wood material friction force improving structure C according to the above-described embodiment will be described below.

In the present example, the static friction coefficient between the timbers was obtained using the friction test apparatus 20 shown in FIG. 11, and the comparison was made by changing the conditions applied to the timbers.
First, the friction test apparatus 20 contacts a base 21 for fixing the first test piece M1 and a pair of second test pieces M2 and M2 arranged at a certain distance from the upper surface of the first test piece M1. And a support base 22 that can be slid and moved in the horizontal direction (the direction of arrow E in FIG. 11). It is possible to place a predetermined weight on the support table 22 on the support table 22 by placing the plate-shaped weights 23 on the support table 22 so as to be opposed to each other above the base table 21. A surface pressure is applied between the test piece M1 and the second test piece M2, and a frictional force is generated.

The support base 22 is configured to be moved in the horizontal direction via a wire 25 provided with a load cell 24 by expansion and contraction of a jack (not shown). That is, the load load by the jack is measured by the load cell 24. Further, the friction test apparatus 20 is provided with a displacement meter (not shown), and the movement amount of the support base 22 with respect to the base 21 (that is, the movement amount of the second test piece M2 with respect to the first test piece M1) is measured. It has come to be.
In addition, in the 1st test piece M1 and the 2nd test piece M2, the surface which both contact in the state set to the friction test apparatus 20 is demonstrated as friction surfaces Ma and Mb, respectively.

  In the friction test apparatus 20 shown in FIG. 11, the first test piece M1 located on the lower side has a height dimension of 45 mm, a width dimension of 150 mm, and a length dimension of 300 mm, and a pair of second test pieces located on the upper side. M2 and M2 are shapes having a height dimension of 50 mm, a width dimension of 25 mm, and a length dimension of 50 mm, respectively. The first test piece M1 and the second test piece M2 are wood materials made of firewood, respectively.

  In this example, as shown in Table 1, on the friction surfaces Ma and Mb of the test pieces M1 and M2, the presence or absence of roughening, the presence or absence of two types of sand (sand sand of sandpaper # 40, standard sand), fixing The test (test 1 to test 8) was performed by combining eight patterns with different four conditions (friction surface conditions 1 to 4) of the presence or absence of the agent, the results were compared, and conventional examples without these friction surface conditions Comparison was also made.

The roughening of the friction surface condition 1 shown in Table 1 is to create the surface roughness by scoring the friction surfaces Ma and Mb of the test pieces M1 and M2 three times using Kenzan. .
The friction surface conditions 2 and 3 are those in which sand particles are interposed on the friction surfaces Ma and Mb between the first test piece M1 and the second test piece M2, respectively. The friction surface condition 2 is a roughness of # 40. The surface of sandpaper is sand particles (shaving sand) having a particle size of about 0.63 mm, and friction surface condition 3 is natural silica sand (standard sand) adjusted to a range of 0.1 to 0.3 mm. .
The friction surface condition 4 is to spray the fixing agent on the friction surfaces Ma and Mb by a commercially available adhesive spray.

  Test 1 is based on conditions where only roughening is applied to the wood surface. Test 2 is based on conditions in which shaving sand is fixed to the surface subjected to roughening with a fixing agent. Test 3 is based on conditions where only the fixing agent was sprayed on the wood surface. Test 4 is based on conditions based on a combination of roughening and fixing agent. Test 5 is roughening and shaving sand, and the shaving sand is based on the condition that the sand on the wood surface was wiped off with a cloth after being scattered. Test 6 is a condition in which shaving sand is spread on a surface without roughening and fixed with a fixing agent. Test 7 is based on conditions in which standard sand was spread on the roughened surface and fixed with a fixing agent. Test 8 is a condition in which shaving sand is fixed to the surface of the roughened wood surface with a fixing agent in the same manner as in Test 2 above, and is a test piece taken from the same wood as Test 7 and has the same density and moisture content. The condition wood is used.

Each test 1-8 uses the friction test apparatus 20 shown in FIG. 11, fixes the 1st test piece M1 to the base 21, and makes a support stand 22 hold | maintain a pair of 2nd test pieces M2 and M2. At this time, the friction surface Ma of the lower first test piece M1 and the friction surface Mb of the upper second test piece M2 are brought into contact with each other while receiving a predetermined surface pressure. Then, the jack is controlled to pull the wire 25, and the support base 22 on which the weight 23 is placed is moved in the horizontal direction at a predetermined speed. The load weight of the weight 23 at this time was 1856N.
That is, the support base 22 is moved 20 mm per time to generate a frictional force on the friction surfaces Ma and Mb between the first test piece M1 and the second test piece M2, and the static friction coefficient μ1 and the dynamic friction coefficient μ2 at this time are obtained. It calculated based on the measured value of the tensile load by the load cell 24, and the moving amount | distance of the support stand 22 by the displacement meter which is not shown in figure. Then, the movement of 20 mm per one time was repeated a plurality of times.

Here, the calculation method of the static friction coefficient μ1 and the dynamic friction coefficient μ2 will be specifically described.
FIG. 12 shows the relationship between the tensile load (frictional force) obtained by each test and the displacement by the displacement meter. The static friction coefficient μ1 is an average value obtained by dividing the static friction force fa (fa1, fa2, fa3) shown in FIG. 12 by the loaded weight G at the time of the test, and can be expressed by the equation (1).

  The dynamic friction coefficient μ2 is obtained by dividing the hatched area (s1, s2, s3) obtained by calculation from the dynamic friction force fb and displacement shown in FIG. 12 by the displacement δ (δ0, δ1, δ2, δ3) of the test piece. The average value can be expressed by the equation (2).

  Next, points that can be confirmed from the results of tests 1 to 8 described above will be described below with reference to FIGS.

(1) When there is a friction surface condition According to the calculation results shown in FIGS. 13 and 14, the static friction coefficient μ1 shown in FIG. 13 is compared with the result of Test 3 in which only roughening is performed in Test 1 and there is no roughening. From about 0.3 to about 0.45, and the dynamic friction coefficient μ2 from about 0.2 to about 0.32. That is, since Test 1 is about 1.5 times larger than Test 3, it was confirmed that the friction coefficient μ was increased by roughing. And the fluctuation | variation of the friction coefficient at this time is a grade which becomes a little small compared with the comparative example which does not give a friction surface condition, and there was a friction sound.

In Tests 2, 6, 7, and 8 in which sand (shaving sand, standard sand) is fixed with a fixing agent, the static friction coefficient μ1 is approximately 0.3 from the result of Test 3 without roughening regardless of whether or not roughing occurs. Thus, it was confirmed that the dynamic friction coefficient was about 0.2 to about 0.6 and about 2.5 to 3 times larger. Note that there is almost no effect of Test 3 using only the fixing agent, and it can be said that the effect of increasing the friction coefficient μ is the effect of sand.
Moreover, it was confirmed that the effect of sand was larger than the effect of roughening the eyes. This can also be confirmed from the fact that it is larger than the result of Test 5 in which the sand was removed from the friction surface of the test piece.
Further, when there is sand (Test 2, 6, 7, 8), the coefficient of friction changes less than when there is no (Test 3), and the friction noise at that time also decreases. It was.

  Further, when sand is fixed with a fixing agent, the decrease in the dynamic friction coefficient μ2 is larger in Test 6 without roughening than in Tests 2, 7, and 8 in which roughening is performed. The tendency to become was seen. This is because, in the case of Test 6, since the sand is only fixed on the surface of the wood and does not remain in a state where the sand is buried in the groove due to roughening, the surface of the wood (friction is increased as the number of repetitions increases. This is thought to be due to the fact that the fixing force of sand to the surface) decreases and the sand moves away from the friction surface and decreases. This is considered to be due to the effect that the sanding does not stop and move due to the roughening of the surface of the wood by applying the roughing, so that the number of sand on the friction surface does not decrease. Therefore, it is necessary to roughen the surface in order to maintain a high dynamic friction coefficient.

  Furthermore, in Test 3 in which only the fixing agent was sprayed on the friction surface of the wood surface, it was confirmed that there was no effect of increasing the friction coefficient. However, since the fixing agent can fix the sand to the surface of the wood like roughening, if the number of repetitions increases as described above, the fixing force by the fixing agent disappears, but it does not decrease from the friction surface. It can be said that there is a certain effect.

  Subsequently, when the test 7 and the test 8 are compared with respect to the effect of the sand type effect, the friction coefficient of the sand of the sandpaper # 40 of the test 8 having a particle size larger than that of the standard sand of the test 7 is the number of repetitions. It becomes smaller with the increase. On the other hand, it was confirmed that the friction coefficient of the test 7 of standard sand having a small particle size was increased as the number of repetitions was increased.

(2) When there is no friction surface condition In FIG. 15, the presence of the friction condition indicates the tests 2, 7, and 8 above, and the absence of the friction condition indicates a comparative example.
As shown in FIG. 15, it was confirmed that the influence of the tree type, the fiber direction, the grain, the loaded weight, and the loading speed was small with respect to the dynamic friction coefficient as well as the static friction coefficient. Here, the static friction coefficient was about 0.24, the dynamic friction coefficient was about 0.18, and the dynamic friction coefficient was about 0.75 times the static friction coefficient.
As for the static friction coefficient, the first value for the dynamic friction coefficient was larger than that for the second and subsequent times, which is considered to have an influence of the loading history. The second time was about 90% of the first time, and when it was repeated 3 to 4 times, both the static friction coefficient and the dynamic friction coefficient became stable, and about 80% of the first time.

(3) Comparison between Tests 2, 7, and 8 and Comparative Example From the results shown in FIG. 15, the coefficient of static friction is approximately 0.7 to 0.73 when there is a friction condition (Tests 2, 7, and 8). None (comparative example) is approximately 0.18 to 0.25. The dynamic friction coefficient is approximately 0.6 to 0.65 with a friction condition, and approximately 0.15 to 0.2 without a friction condition. For this reason, both the static friction coefficient and the dynamic friction coefficient are approximately three times greater when there is a friction condition than when there is no friction condition, and the frictional force is applied to wood that is not subjected to roughening and fixing the crushed sand with a fixing agent. Was confirmed to be improved.

In addition, FIG. 16 has shown the enlarged photograph of the wood surface in Test 7, and can confirm the state which the standard sand (code | symbol 11) latched to the roughening part 10. FIG.
FIG. 17 shows an enlarged photograph of the wood surface in Test 8, and it can be confirmed that the sand sand (reference numeral 11) by sandpaper is locked to the roughening portion 10.

As mentioned above, although embodiment of the frictional force improvement structure of the wooden material by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the present embodiment, the frictional force improving structure C is applied to the vibration control structure B of the seismic plate wall structure A. However, the present invention is not limited to adopting such a structure, but a wooden building or a wooden structure. It is possible to apply the frictional force improving structure C as a combination part or a base treatment. For example, a frictional force improving structure can be used at the joint between the column and the beam.

Further, in the present embodiment, the frictional force improving structure C is configured such that the roughening portion 10 is formed on the surface of the wood and the sand 11 is crushed and then the sand 11 is fixed with the fixing agent 12. The shape is not limited, and the roughening portion 10 and the fixing agent 12 can be omitted. The method is not limited to the method in which the fixing agent 12 is sprayed on the crushed sand 11 but may be a method in which a liquid obtained by mixing a particulate material in a liquid such as lacquer or pigment is applied with a brush. . In short, the purpose of the fixing agent is to fix the particulate material to the friction surface as an initial state, and it is not necessary to directly contribute to the improvement of the frictional force.
Moreover, the roughening part 10 does not need to be formed in both of a pair of wooden materials which comprise a friction surface, and should just be formed in the friction surface of at least one wooden material.

Furthermore, although this embodiment employs cocoons as the tree species of the wood material, it is not limited to tree species, and may be any wood-based material such as rice hiba, hiba, pine, and zelkova.
Furthermore, the configuration such as the groove width and roughness of the roughening portion 10 can be set as appropriate according to the particle size of the granular material, and the roughening method is not limited to that by Kenzan.
Moreover, in this Embodiment, although the sand and the sand with sandpaper are object as a granular material, it is not limited to this. In short, any granular material that is harder than the wood material to be rubbed may be used.

In addition, it is possible to adjust the coarse particle size of the granular material so as to have a target friction coefficient, and it is also possible to adjust the amount of distribution of the granular material so as to have a target friction coefficient.
By the way, in the above embodiment, the granular material is fixed to the friction surface, but it is not always necessary to fix the granular material so that it does not move. For example, the granular material is adhered to the friction surface with an adhesive, or with water. It is only necessary to temporarily attach the particulate material to the friction surface. Adhesion in this embodiment is used in the subordinate concept of adhesion. Furthermore, the particulate matter may adhere to the friction surface, but it may adhere to one friction surface but not to the other friction surface, and the friction surfaces may face each other, or may adhere to both friction surfaces. The friction surfaces may be opposed to each other.

1 pillar 2 wall plate 4 wooden dowel 5 first fitting groove 5a inner surface 6 second fitting groove 6a inner surface 7 friction damping member 7a one surface 7b other surface 8 wedge fitting groove 8a, 8b groove side surface 9 wedge 10 roughening portion 11 sand (Granular material)
12 Fixing agent 20 Friction test device 21 Base 22 Support base A Seismic plate wall structure B Damping structure C Friction force improving structure T1 Lateral direction (horizontal direction)
T2 vertical direction

Claims (2)

A structure for improving the frictional force of a wooden material to improve the frictional force between the wooden materials,
Interposing a particulate material harder than the wood material on the friction surface between the wood materials ,
A roughening portion is formed on the friction surface of at least one of the wooden materials,
The structure for improving the frictional force of a woody material, wherein the granular material has a particle size capable of being bitten in the groove of the roughening portion . 2. The structure for improving the frictional force of a woody material according to claim 1, wherein the particulate matter is adhered to the friction surface .