JPH0750169Y2 - Puzzle type laminated wood - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] This invention compensates for the shortcomings of wood,
More specifically, the present invention relates to a puzzle-type laminated lumber that is bonded by combining lumbers that maximize the diameter of raw wood.

[0002]

2. Description of the Related Art Conventionally, lumber having a quadrangular cross section, which is generally called a lumber horn, is made by using a log of too large diameter, cypress or the like. However, even if it is a good quality log such as Sugi and Hinoki, it has little use as a lumber if it is a small diameter tree or the small diameter part is left as it is. For this reason, it is processed into a small square member 22 for laminated wood and is used as a general-purpose laminated wood 21 having a large cross section.

Laminated wood 21 is a lumber or small square wood 22.
Etc. are assembled and adhered into one block material. As shown in FIG. 4, the lumber or small square members 22 are assembled and laminated in the thickness and width directions. In domestic demand materials, mainly because the grain pattern is pleasing,
At present, as shown in FIG. 4, a laminated member 21 having a veneer 23 applied to make it look like a beveled corner is often used. Such a laminated material 21 is characterized in that it is possible to reduce the nonuniformity of the strength of the raw wood and to improve the yield of utilization of the raw wood.

[0004]

[Problems to be Solved by the Invention] On the other hand, since a large number of thin lumbers and the like are laminated, it takes time and effort to make it into a laminated lumber It wasn't an effective way to do it. Therefore, an object of the present invention is to provide a laminated lumber that effectively utilizes the thickness of a small-diameter tree or the like to form a lumber having a larger diameter and has a good appearance.

[0005]

In the present invention, a means for solving the above-mentioned problems is a square cross section in which a plurality of lumbers cut from a raw wood are combined and bonded so that the wood grains are parallel to each other. The sawn timber of claim 1, wherein the lumber is divided into two pieces along the diameter from the one log having a diameter H, and is further cut out from both to form a substantially triangular cross-section having a bottom along the diameter. A chamfered surface having a width d newly formed by chamfering by cutting at a predetermined distance a from this end at one of both bottom angles of this cross section and the bottom of the other. At the corner, an end cut from the bottom corner is abutted to form a right-angled strip-shaped side surface having a width a and a convex portion having a chamfered surface having the width d and an abutting surface having the same shape. By forming the chamfered surface, A puzzle-shaped drawing material having a bottom surface having a width h (= Ha) including sides is formed, and four such puzzle-shaped drawing materials are used to be adjacent to the chamfered surface of each puzzle-shaped drawing material. By combining the abutting surfaces with each other, the bottom surface having the width h and the strip-shaped side surface having the width a form each side surface having the width H of the laminated wood, and the cross section of the laminated wood is formed. It exists in laminated wood.

[0006]

According to the laminated wood described above, a log having a small diameter (diameter H) has a substantially triangular cross section having a base along the diameter, and one of the two base angles of the triangle of this cross section is from the end. Chamfering to a predetermined width and shape, the other bottom corner is formed by abutting a portion corresponding to the bottom corner of the end cut at the bottom corner to form a convex portion forming an angle at right angles with the bottom, A strip-shaped side surface having a width a and an abutting surface having a width d are formed on the newly formed convex portion, and as a result, the bottom surface including the bottom along the diameter is formed to have a width h (= Ha). To be done. In other words, this puzzle-shaped lumber is chamfered at one of the base angles of an isosceles triangle whose base is a circular chord that is almost inscribed in a semicircular shape, and the chamfered part is attached to the other base corner. It is configured to have. Therefore, the diameter H (= h +) can be obtained by abutting the abutting surface and the chamfered surface of the four convex puzzle-shaped lumbers.
It is possible to manufacture a regular-angle laminated material having a) as one side. Further, since the four lumbers are combined with each other, the strength of the lumber is improved. Further, since the two side faces of each lumber form the side faces including the corners of the laminated lumber as it is, the cornering is also easy. Furthermore, by combining in this way, it is possible to reduce twisting and warping,
Since the wood grain centered inside the raw wood appears on the surface side of the laminated lumber, it is a laminated lumber that can reduce the number of knots that appear on the surface of the laminated lumber and can also be unknotted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to a square-shaped (1 side 12 cm) square-shaped puzzle-shaped laminated member 1 having a cross section shown in FIG. As the raw material of the present invention, for example, logs such as sugi, karamatsu, and cypress are used and have a diameter H of 12 cm. The length is 4m.
The type of tree is selected according to the purpose and use, the diameter H of the raw tree is selected according to the length of one side of the regular angle to be made, and the length is selected according to the use. The raw material of this raw material is dried. In addition, the diameter mentioned here is an effective diameter at the time of cutting, and does not include the outer skin of the raw wood.

FIG. 1 shows a laminated member 1 having a regular angle of 12 cm on each side.
A cross section of is shown. This laminated member 1 is formed by combining four puzzle-shaped lumber 3 having a length of 4 m and having four cross sections 3a of the same shape. FIG. 2 shows a state in which the puzzle-shaped lumber 3 is cut out from a 12 cm diameter log. The puzzle-shaped lumber 3 is divided into two pieces in the length direction with the center line (diameter) w of the cross section sandwiching the center tree, and the arc sides on both sides also have the center line w in a predetermined shape with the center line w sandwiched between the left and right sides of the tree. It is cut along the depth direction. That is, two lumbers 3 are cut out from one raw wood, and each lumber 3 has a substantially triangular cross section, and is formed on the bottom side 4 along the center line w of the raw wood and on the arc side of the raw wood. It is composed of sides.

The surface of the pulling material 3 formed in the lengthwise direction is composed of a flat bottom surface 5 including a bottom side 4 and joints 6a and 6b including two sides on the arc side. In FIG. 2, an isosceles triangle is drawn along the center line w with the diameter H of the raw tree as the base 4 and the imaginary lines a and b as sides of equal length. Hereinafter, the puzzle-shaped pulling material 3 will be described using these virtual lines a and b.

First, the joint 6a corresponding to this virtual line a
Is a predetermined width a from the end of the bottom 4 where this joint 6b is located.
(1.5 cm in the present embodiment) From the inside of the raw wood, there is a step and a depth equal to the width a, and the bottom 4
Two stairs are formed so that their corners coincide with the virtual line a. The first and second steps of this staircase are chamfered 8a and 8b with a predetermined width. Furthermore this 2
A step at a right angle is formed on the bottom side 4 from the end portion at the back of the step, and after contacting the virtual line a, a slanted portion 8c having a predetermined width is formed along the virtual line a. Further, an apex portion 8d, which is a surface parallel to the base 4, is formed. Here, the surface corresponding to the step of the first staircase is the chamfered surface 6c, and this width is d. In this embodiment, the width d is equal to the width a.

The stairs 6b corresponding to the imaginary line b have steps having the same width and depth as the stairs of the stairs 6a from the end of the bottom 4 and the depths are substantially equal (a = 1.5 cm). b
A slanted portion 7d that is formed along the outer side of the stairs and that extends obliquely from the end of the third stairway from the bottom surface 4 along the imaginary line b of a predetermined width, and the apex portion formed on the joint 6a. It is formed on a flat surface continuous with 8d. Further, the corners of the second and third steps from the bottom 4 are chamfered 7b and 7c to have a predetermined width, like the port 6a. The corner 7a of the first step remains unchanged (right angle). Here, the strip-shaped side surface corresponding to the step of the first staircase is 6e, the width thereof is a, and the side surface corresponding to the depth of this staircase is the abutting surface 6.
The width is d and the width is d. In the present embodiment, this width d
Becomes equal to the width a. This abutting surface 6d is a joint 6a
It is the same as the chamfered surface 6c. That is, 1 formed by the strip-shaped side surface 6e and the abutting surface 6d
The stairs of the step correspond to the convex portion according to claim 1. In addition,
The widths of the slanted portions 8c and 7d formed on both the joints 6a and 6b are equal.

As described above, the cross section of the pulling material 3 is obtained by cutting the width a from the diameter H initially set as the bottom side 4. As a result, the length of the bottom side of the cross section of the puzzle-shaped pulling material 3 becomes Ha, and when this is h, the bottom surface 5 has a width h (1
0.5 cm). At this time, between the diameter H of the raw wood, the width h of the bottom surface 5 and the width a of the strip-shaped side surface 6e, H
The relationship of = h + a is established. That is, as described above, the joints 6a and 6b of the individual puzzle-shaped pulling materials 3 are formed left-right unsymmetrically with the center line d interposed therebetween. Then, as shown in FIG.
By fitting the second and third stairs into the two recesses of the joint 6a, respectively, the convex portion formed by the strip-shaped side surface 6e and the abutting surface 6d perpendicular to the bottom surface 5 and the chamfered surface 6c are formed. It has a substantially triangular shape. Further, when the convex portion including the strip-shaped side surface 6e is butted against the chamfered surface 6c on the side of the joint 6a, the base H becomes a substantially isosceles triangle having (h + a). That is, the joint 6a and the joint 6b of one pulling member 3 have a structure which complements each other, and when they are finally filled with each other, four joints are formed to form a square with one side H. The puzzle-shaped pulling material 3 has a substantially isosceles triangular cross-section that can be formed.

Two such puzzle-shaped pulling materials 3 are cut out as a reference with the center line w interposed therebetween. Therefore, although the end faces of the two lumbers 3 cut as shown in FIG. 2 are not the same, the end face of one lumber shown in FIG. 2 and the end face of the other lumber 3 shown in FIG. The other end face which is not formed has the same shape, and the two pulling members 3 have the same shape. It should be noted that the flat bottom surface 5 of the puzzle-shaped lumber 3 has a grain (board grain) near the diameter of the raw tree. This wood grain part forms most of the side surface 1a of the puzzle-shaped laminated wood 1. Furthermore, another two puzzle-shaped lumbers 3 are cut out from a log having the same shape as above.

The four puzzle-shaped lumbers 3 having the same shape formed in this way are combined in parallel with each other in the grain direction so that the end faces of the same shape are combined to form the upper and lower end faces 2 of the laminated wood 1. ing. As shown in FIG. 1, the two puzzle-shaped pulling materials 3 and the strip-shaped side surface 6e of one of the joints 6b.
And the bottom surface 5 of the other pulling member 3 are combined so as to form the same plane. Therefore, each lumber 3
The strip-shaped side surface 6e and the bottom surface 5 of the joint 4b directly form an angle in the longitudinal direction of the laminated material 1. As a result, the three stairs of the joints 6b mesh with the stairs of the adjacent joints 6a, and the chamfered surface 6c of the joint 6a and the abutting surface 6d of the joint 6b are abutted. In this way, the joints 4a and 4b are butted one after another, and a total of four pulling members 3
By combining all of them, the laminated material 1 having a square cross section 2 and a length of 4 m is formed. Appropriate adhesives are applied to these joints 6a and 6b and then combined and adhered.

As is apparent from FIG. 1, the four side surfaces 1a of the laminated material 1 are always formed by the bottom surface 5 of the ground material 3 and the strip-shaped side surface 6e of the joint 6b of the ground material 3 from the end of the side surface 1a. One seam 9a is formed in the longitudinal direction. At this time, since the width of the bottom surface 5 is 10.5 cm and the width of the strip-shaped side surface 6e is 1.5 cm, 1
The side is 12 cm, which is equal to the diameter H of the raw wood. Moreover, a surface having a grain along the centerline w of the raw wood appears on the side surface 1 a of the laminated wood 1.

Furthermore, in the cross-section 2 of the laminated wood 1, there are 3 parts at the joints 9 between the joints 6 of the puzzle-shaped lumber 3
A square hole 10 is formed. This hole 10 is provided with chamfered corners 7b, 7
c and 8a, 8b are formed by abutting the recessed right angle between the stairs. Therefore, each of the four holes 10 is formed between the four joints 9 formed in the cross section 2 of the laminated lumber 1, and a total of 16 holes 10 are penetrated along the grain direction of the laminated lumber. become. The size of each hole 10 is the same.

Excessive adhesive out of the adhesive applied to the joints 6a and 6b is squeezed out through the holes 10 to form the joints 6a and 6b.
It is provided so that b can be brought into close contact with each other accurately. In addition, after joining, it becomes an air vent hole of the laminated material 1 and the humidity of the laminated material 1 is maintained at an appropriate level. Furthermore, a large square hole 11 is formed in the center of the four puzzle-shaped pulling members 3. This hole 11 also has the same function as the above hole 10. Even if such holes 10 and 11 are formed, the strength of the laminated member 1 is not reduced.

The lumber 3 cut from the raw wood in this way
Is usually cut out from a log with a diameter H of 12 cm and has a width h
It has a puzzle shape with a bottom surface 5 of (10.5 cm) and a substantially triangular cross section. The bottom surface 5 having a width h of 10.5 cm and the strip-shaped side surface 6 e having a width a of this sawing material 3 are provided on the side surface 1 of the laminated material 1.
By arranging it in a, it is possible to manufacture one united lumber 1 having a square cross section with a side of 12 cm equal to the diameter H (= h + a) of the raw wood and a length of 4 m. That is, unlike the conventional laminated lumber, it is possible to form the laminated lumber 1 with four lumbers and it is easy to square the laminated lumber 1 without using a large number of small timbers or lumbers. Moreover, this laminated lumber 1 is a laminated lumber with high strength due to the stepwise combination of the lumber 3 with each other, and the dense and hard part of the center of the raw wood is on the surface 1a side of the laminated lumber 1. The stress generated in the material 1 can be effectively suppressed.

Further, since the center side of the raw wood comes to the surface 1a side of the laminated wood 1, the laminated wood 1 has few or no knots. Further, unlike the conventional laminated wood, the natural grain of the grain appears on the entire side surface 1a, and the original grain of the raw tree is effectively utilized. It is possible to reduce twisting, warping and cracking as in the conventional laminated wood.

Further, holes 10 and holes 11 are formed in the laminated member 1, the joint portion 9 and the central portion. The holes 10 and 11 are formed.
A preservative can also be injected into. Further, by increasing the holes 10 and 11 within a range in which the strength of the laminated member 1 is maintained without lowering the adhesive strength between the puzzle-shaped pulling members 3, the weight of the structural laminated member can be reduced,
It is possible to insert a suitable core material or the like, or wire an electric wire or the like. Further, if necessary, it is possible to apply makeup to the surface of the laminated material 1.

It is to be noted that the same laminated wood 1 can be made from a 12 cm raw wood having a length of 8 m, for example. It is also possible to join the puzzle-shaped lumber 3 in the length direction to make a longer laminated lumber 1. In this case, the seams are dispersed in the length direction.

The way of cutting out the puzzle-shaped pulling material 3, that is, the shape of its cross section is not limited to that shown in this embodiment. Any shape may be used as long as they can be combined with each other and firmly adhered to each other, and can form a corner of the laminated member 1 by one side face and one end face formed at right angles. Further, in the present embodiment, the bottom side 4 is made to coincide with the center line w of the raw wood, but it is not always necessary to make it coincident, and the bottom surface 5 having the width h can be formed and the convex portion can be formed. It may be the bottom along the diameter.

[0023]

As described above, according to the present invention, four pieces of puzzle material cut out from a log having a diameter of H in a puzzle shape are combined with each other and bonded to each other to have a square cross section of one side H. You can make a laminated lumber with a square shape. Therefore, it is possible to produce the laminated wood that makes the most of the diameter of the raw wood and utilizes the natural wood grain at a low cost. In addition, it has the advantage of correcting the unevenness of raw wood as laminated wood,
The appearance is like a rake, and it has become a highly demanded laminated timber even if it is the base material because the grain is exposed on the surface. further,
It can be of low knot or no knot, which is highly valuable as a construction material.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a puzzle-type laminated wood.

FIG. 2 is a cross-sectional view showing a cut-out state of a puzzle-shaped lumber from raw wood.

FIG. 3 is a diagram showing the mutual relationship of the shapes of the two joints of the lumber.

FIG. 4 is a cross-sectional view of a conventional laminated material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Puzzle type laminated wood 1a ... Side surface of laminated wood 2 ... Cross section 3 ... Puzzle-shaped lumber 4 ... Bottom 5 ... Bottom of width h 6c ... Chamfered surface of width d 6d ... Butt surface of width d 6e ... Of width a Strip side

Claims (1)

[Scope of utility model registration request] 1. A laminated lumber having a square cross section, which is bonded by combining a plurality of lumbers cut from raw wood so that the grain of the lumber is parallel to each other, wherein the lumber has a diameter H. Is divided into two along the diameter from the raw wood, and is further cut out from both to be formed into a substantially triangular cross-section having a bottom along the diameter.
One of the bottom angles of this cross section has a predetermined distance a from this end.
Then, a chamfered surface having a width d newly formed by being chamfered at a predetermined angle with respect to the base and a width at which the end cut from the bottom corner is abutted to the other bottom corner to form a right angle. A convex portion having a strip-shaped side surface of a and a chamfered surface of the width d and an abutting surface of the same shape is formed, and
By forming the chamfered surface, the width h
A puzzle-shaped drawing material having a bottom surface having (= Ha) is formed, and four chamfered drawing materials are used to match the chamfered surface of each puzzle-shaped drawing material with the abutting surface adjacent to the chamfered surface. As a result, the puzzle-type laminated material is configured such that the bottom surface having the width h and the strip-shaped side surface having the width a form each side surface having the width H of the laminated material and also a cross section of the laminated material.