JP7440050B1 - Prestressed wood structure and its manufacturing method - Google Patents

Abstract

[Problem] To obtain a prestressed wooden structure in which a tensioned steel wire insertion groove can be easily formed and structural weaknesses are eliminated as much as possible. [Solution] A process of forming a plurality of grated plates 30 whose fiber direction is the longitudinal direction, forming tensioned steel wire insertion grooves 20 over the entire length on the joint surface of the grated plates 30, and inserting the tensioned steel wires. A step of forming protrusions 21 protruding from both walls at positions desired to serve as nodes for buckling deformation of the groove 20, and joining the grated plate 30 with and without the tensioned steel wire insertion groove 20 formed thereon. a step of constructing the wooden structure 29 by inserting the tension steel wire 28 of the prestressing device 36 into the tension steel wire insertion groove 20 and tensioning the tension steel wire 28; It consists of a step of applying compressive stress and fixing both ends of the tensioned steel wire 28 at both ends of the wooden structure 29 by a fixing device 32. [Selection diagram] Figure 1

Description

The present invention provides a prestressed wooden structure that prevents buckling of wooden structures such as laminated timber, CLT timber (orthogonal grain timber), LVL timber (parallel timber timber), beam timber, column timber, and flat timber, and a method for manufacturing the same. It is related to.

The applicant proposed a prestressed elongated structure 10 as shown in FIG. 11 (Patent Document 1).
This elongated structure 10 is made up of three pieces connected together with a length within the buckling length, and a through hole 11 is bored in the axial direction, and the elongated structure 10 in this through hole 11 is A fitting recess 19 is formed in the connecting surface of the tension member 12, and a tendon position holding piece 18 is disposed therein. is passed through the through hole 11 and the circular hole 18a of the tendon position holding piece 18, and prestress is applied to both ends by the fixing device 14 via the plate 13 so as to produce a predetermined compressive force.
Such a configuration prevents the three-piece elongated structure 10 from bending due to buckling.

Furthermore, in Patent Document 1, when one elongated structure has a buckling length or more, a fitting hole is drilled from the side at a position of the buckling length in the middle of the elongated structure to maintain the tendon position. An example is shown in which a piece is fitted and a tendon is inserted.

JP2020-7708A

In the elongated structure 10 described in Patent Document 1, the tendon position holding pieces 18 must be arranged on each connecting surface of the elongated structure 10 in which a plurality of pieces divided within the buckling length are connected. The structure becomes a little complicated, and it is a little troublesome to form the fitting recess 19 in which the tendon position holding piece 18 is placed. Since they are perpendicular to each other, there was a problem with the structure, which was a weak point.
In addition, if the member length of one long structure is longer than the buckling length, a fitting hole is drilled from the side in the middle, a tension member position holding piece is fitted, and the tension member is inserted. There was a problem in that the position of the fitting hole drilled from the side became a structural weakness of the elongated structure.

The present invention has been made in order to solve the above problems, and takes advantage of the characteristics of the wooden structure and uses tensioned steel wires at the stage of making a single sawn board or a sawn board block consisting of a plurality of boards before laminating them into a wood structure. An insertion groove is formed in which the insertion groove is set, and this member is laminated and bonded together with a sawn board without an insertion groove to form a wooden structure and prestress is applied.

The method for manufacturing a prestressed wooden structure according to claim 1,
a sawing board forming step of forming a plurality of sawn boards 30 whose fiber direction is the longitudinal direction;
A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of one of the drawing plates 30 with the other drawing board 30, and a tension steel wire insertion groove 20 is formed at both sides of the position where the tensioned steel wire insertion groove 20 is desired to be a node of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion 21 protruding from the wall;
A wooden structure in which a wooden structure 29 is formed by joining one of the grounding plates 30 in which the tensioned steel wire insertion grooves 20 are formed and the other drawing board 30 in which the tensioned steel wire insertion grooves 20 are not formed. configuration process,
By inserting the tension steel wire 28 of the prestressing device 36 into the tension steel wire insertion groove 20 and tensioning the tension steel wire 28 with a jack or the like, an axial compressive stress is applied to the wooden structure 29, and the tension steel It is characterized by comprising the step of applying an axial compressive force to fix both ends of the wire 28 to both ends of the wooden structure 29 by a fixing device 32.

The method for manufacturing a prestressed wooden structure when the wooden structure consists of a flat member 35 is as follows:
a sawing board forming step of forming a plurality of sawn boards 30 whose fiber direction is the longitudinal direction;
a planar member forming step of joining the plurality of sawn boards 30 whose fiber directions intersect with each other to form a planar member 35;
A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of the one drawing board 30 forming the planar member 35 with the other drawing board 30, and buckling deformation of the tensioned steel wire insertion groove 20 is performed. a step of forming a tensioned steel wire insertion groove to form a protrusion 21 protruding from both walls at a position desired to be a node;
A planar wooden structure 29 is constructed by joining the one grated plate 30 in which the tensioned steel wire insertion groove 20 is formed and the other grated plate 30 in which the tensioned steel wire insertion groove 20 is not formed. Wooden structure construction process,
By inserting the tension steel wire 28 of the prestressing device 36 into the tension steel wire insertion groove 20 and tensioning the tension steel wire 28 with a jack or the like, an axial compressive stress is applied to the wooden structure 29, and the tension steel It is characterized by comprising the step of applying an axial compressive force to fix both ends of the wire 28 to both ends of the wooden structure 29 by a fixing device 32.

The method for manufacturing a prestressed wooden structure when the wooden structure consists of column members 34 is as follows:
a sawing board forming step of forming a plurality of sawn boards 30 whose fiber direction is the longitudinal direction;
a pillar member forming step of joining the plurality of sawn boards 30 to form a pillar member 34;
Tensioned steel wire insertion grooves 20 are formed over the entire length of the joint surfaces of at least two of the other grounded plate 30 of the one of the grounded plates 30 forming the column member 34, and the tensioned steel wire insertion grooves 20 are a tension steel wire insertion groove forming step of forming protrusions 21 protruding from both walls at positions desired to be nodes of buckling deformation;
A wooden structure in which the one column member 34 in which the tensioned steel wire insertion groove 20 is formed and the other pillar member 34 in which the tensioned steel wire insertion groove 20 is not formed are joined to form a columnar wooden structure 29. body composition process,
By inserting the tensioned steel wire 28 of the prestressing device 36 into the tensioned steel wire insertion groove 20 and tensioning the tensioned steel wire 28, an axial compressive stress is applied to the wooden structure 29, and the tensioned steel wire 28 is It is characterized by comprising the step of applying an axial compressive force to both ends of the wooden structure 29 using a fixing device 32.

In order to prevent the wooden structure 29 from buckling in the width direction, the protrusions 21 protrude in the width direction of the ground board 30 from both walls at positions where the tensioned steel wire insertion groove 20 is desired to be buckling deformation nodes. It is characterized by being formed by

In order to prevent buckling in the direction orthogonal to the width direction of the wooden structure 29, the protrusion 21 is inserted into the ground plate 30 from both walls of the tensioned steel wire insertion groove 20 at a position where the buckling deformation node is desired. It is characterized by being formed to protrude in a direction perpendicular to the width direction.

The prestressed wooden structure of the present invention is
In a wooden structure 29 in which a plurality of sawn boards 30 whose fiber direction is the longitudinal direction are joined together,
A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of one of the drawing plates 30 with the other drawing board 30, and a position in the middle of the tensioned steel wire insertion groove 20 that is desired to be a node of buckling deformation is formed. The wooden structure 29 is made by joining together a plurality of sawn plates 30 with and without the tensioned steel wire insertion grooves 20 and the protrusions 21 formed thereon. By inserting the tension steel wire 28 of the prestressing device 36 into the tension steel wire insertion groove 20 and tensioning the tension steel wire 28, an axial compressive stress is applied to the wooden structure 29. Both ends of the tensioned steel wire 28 are fixed at both ends of the wooden structure 29 by a fixing device 32, and axial compression is applied to the wooden structure 29 so that the tensioned steel wire 28 is in contact with the weak axis direction of the protrusion 21. It is characterized by being made of something that has been given power.

The prestressed wooden structure made of planar members of the present invention is
A wooden structure 29 formed by joining in the plane direction two or more planar members 35 formed by joining a plurality of sawn boards 30 whose fiber directions are orthogonal to each other, and one of the planes to be joined. A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of the member 35, and a protrusion 21 is formed that protrudes from both walls at a position where the tensioned steel wire insertion groove 20 is desired to be a node of buckling deformation. A planar wooden structure 29 is constructed by joining the planar member 35 on which the tensioned steel wire insertion groove 20 and the protrusion 21 are formed, and the planar member 35 without the projection 21 . By inserting the tensioned steel wire 28 of the stress device 36 and tensioning the tensioned steel wire 28 with a jack or the like, an axial compressive stress is applied to the wooden structure 29, and both ends of the tensioned steel wire 28 are connected to the wooden structure. 29 and is fixed by a fixing device 32 at both ends thereof.

The prestressed wooden structure consisting of the column member of the present invention is
A wooden structure 29 formed by joining a plurality of sawn boards 30 whose fiber direction is in the longitudinal direction to constitute a column member 34, the other sawn board 30 of the one sawn board 30 forming the pillar member 34. Tensioned steel wire insertion grooves 20 are formed over the entire length in at least two joint surfaces of the tensioned steel wire insertion grooves 20, and protrusions 21 protruding from both walls at positions desired to be nodes of buckling deformation of the tensioned steel wire insertion grooves 20 are formed. However, the one protrusion 21 is formed to protrude in the width direction of the grinding board 30 from both walls at the position desired to be the node of buckling deformation of the tensioned steel wire insertion groove 20, and The portions 21 are formed to protrude in a direction perpendicular to the width direction of the drawing board 30 from both walls at positions where buckling deformation nodes of the tensioned steel wire insertion groove 20 are desired. A columnar wooden structure 29 is constructed by joining the sawn plate 30 with the protrusion 20 and the sawn plate 30 without the protrusion 21 formed thereon, and the tensioned steel wire 28 of the prestressing device 36 is inserted into the tensioned steel wire insertion groove 20. By inserting the tensioned steel wire 28 into the wooden structure 29 and tensioning it with a jack or the like, an axial compressive stress is applied to the wooden structure 29. It is characterized by being made up of things that are firmly established.

According to the invention described in claim 1, the method for manufacturing a prestressed elongated wooden structure comprises:
a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
A tensioned steel wire insertion groove is formed over the entire length on the joint surface of one of the drawn plates with the other drawn plate, and a groove protrudes from both walls at a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion;
a wooden structure construction step of configuring a wooden structure by joining the one sawn board in which the tensioned steel wire insertion groove is formed and the other ground board in which the tensioned steel wire insertion groove is not formed;
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. The process consists of applying an axial compressive force that is fixed by a fixing device at both ends of the tension member, so there is no need to arrange tendon position holding pieces as in the past, simplifying the structure and making it easier to arrange tendon position holding pieces. There is no need to form fitting recesses that are perpendicular to each other, and the orthogonal fitting recesses do not become a structural weakness.
Further, there is no need to drill a fitting hole from the side in the middle of the elongated structure, and this does not become a structural weakness of the wooden structure. Moreover, the working process is easy.

According to the invention as claimed in claim 2,
a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
a planar member forming step of forming a planar member by joining the plurality of sawn boards whose fiber directions intersect with each other;
A tensioned steel wire insertion groove is formed over the entire length of the joint surface of one of the grounding plates forming the planar member with the other drawing board, and a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion protruding from both walls;
A wooden structure construction step of forming a planar wooden structure by joining the one sawn board with the tensioned steel wire insertion groove formed therein and the other grounded board without the tensioned steel wire insertion groove formed therein. and,
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. and a step of applying an axial compressive force to fix the material by a fixing device at both ends of the material. Therefore, the present invention can be used when forming a planar member.

According to the invention recited in claim 3,
a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
a pillar member forming step of joining a plurality of the sawn boards to form a pillar member;
Tensioned steel wire insertion grooves are formed over the entire length in at least two joint surfaces of the other one of the two grated plates forming the column member, and the tensioned steel wire insertion grooves are formed at nodes of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion protruding from both walls at the desired position;
a wooden structure construction step of forming a columnar wooden structure by joining the one column member in which the tensioned steel wire insertion groove is formed and the other pillar member in which the tensioned steel wire insertion groove is not formed;
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. and a step of applying an axial compressive force to fix the material using a fixing device at both ends of the material. Therefore, the present invention can be used when forming a pillar member.

According to the invention described in claim 4,
The protrusions are formed to protrude in the width direction of the sawn board from both walls at the positions desired to be nodes of buckling deformation of the tensioned steel wire insertion groove, so that if buckling occurs in the width direction of the wooden structure. is effective.

According to the invention described in claim 5,
The protrusions are formed so as to protrude from both walls in a direction perpendicular to the width direction of the sawn board at positions where buckling deformation nodes of the tensioned steel wire insertion groove are desired, so that buckling occurs in the width direction of the wooden structure. It is effective when it occurs in a direction perpendicular to .

According to the invention described in claim 6,
In a wooden structure made by joining multiple sawn boards with the fiber direction in the longitudinal direction,
A tensioned steel wire insertion groove is formed over the entire length of the joint surface of one of the drawn plates with the other drawn plate, and a tensioned steel wire insertion groove is formed in the middle of the tensioned steel wire insertion groove from both walls at a position desired to be a node of buckling deformation. A protruding protrusion is formed, and the wooden structure is formed by joining a plurality of sawn plates having the tensioned steel wire insertion groove and the protrusion formed thereon and a sawn board having the tensioned steel wire insertion groove and the protrusion not formed. The tensioned steel wire of the prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are is fixed by a fixing device at both ends of the wooden structure, and an axial compressive force is applied to the wooden structure so as to contact the tensioned steel wire in the direction of the weak axis of the protrusion. 1 has the same effect.

According to the invention described in claim 7,
A wooden structure formed by joining two or more planar members in the planar direction, each of which is formed by joining a plurality of sawn boards whose fiber directions are orthogonal to each other, and the joining of one of the planar members to be joined. A tensioned steel wire insertion groove is formed on the surface over the entire length, and a protrusion protruding from both walls is formed at a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. A planar wooden structure is constructed by joining a planar member on which a protrusion is formed and a planar member on which the tensioned steel wire insertion groove and no protrusion are formed, and a prestressing device is installed in the tensioned steel wire insertion groove. An axial compressive stress is applied to the wooden structure by inserting a tensioned steel wire and tensioning the tensioned steel wire, and both ends of the tensioned steel wire are fixed at both ends of the wooden structure by a fixing device. Therefore, the same effect as in claim 2 is obtained.

According to the invention described in claim 8,
A wooden structure formed by joining a plurality of sawn boards whose fiber direction is in the longitudinal direction to form a column member, wherein at least two joints of one sawn board forming the pillar member and the other sawn board form the pillar member. A tensioned steel wire insertion groove is formed on the surface over the entire length, and protrusions protruding from both walls are formed at positions desired to be nodes of buckling deformation of the tensioned steel wire insertion groove, and one of the projections is The other protrusion is formed to protrude in the width direction of the board from both walls at positions desired to be nodes of buckling deformation of the tensioned steel wire insertion groove, and the other protrusion is formed to prevent buckling deformation of the tensioned steel wire insertion groove. The tensioned steel wire insertion groove and the tensioned steel wire insertion groove are formed by protruding from both walls in a direction perpendicular to the width direction of the board at the position where the deformation node is desired, and have the tensioned steel wire insertion groove and the protrusion formed therein. A column-shaped wooden structure is constructed by joining a sawn board with no protrusions, and the tensioned steel wire of the prestressing device is inserted into the tensioned steel wire insertion groove to tension the tensioned steel wire. Since axial compressive stress is applied to the wooden structure and both ends of the tensioned steel wire are fixed by a fixing device at both ends of the wooden structure, the same effect as in claim 3 can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged partially cutaway plan view showing Example 1 of a prestressed wooden structure and a method for manufacturing the same according to the present invention. 2 is a perspective view of the tensioned steel wire insertion groove 20 in FIG. 1. FIG. (a) is a side view of the wooden structure 29 in FIG. 1, and (b) is an enlarged sectional view taken along the line AA in FIG. (a) is a cross-sectional view showing an example in which the inclined surface 22 of the protrusion 21 is curved, and (b) is a cross-sectional view showing an example in which the tension steel contact surfaces 23 of the opposing protrusion 21 are misaligned. . It is a perspective view showing an example in which prestress is applied to a wooden structure 29 made of a planar member 35 in which sawn boards 30 whose fibers intersect with each other are joined together in a direction that intersects with each other. FIG. 3 is a perspective view showing an example in which tensioned steel wire insertion grooves 20 are formed in the joint surfaces of two planar members 35. In a wooden structure 29 consisting of a column member 34 made by joining a plurality of sawn boards 30, (a) to (f) are different structures in which an X-axis tension wire insertion groove 20X and a Y-axis tension wire insertion groove 20Y are formed. FIG. 3 is an end view showing an example. It is an end view which shows the example which formed the tension wire insertion groove 20X for X-axis, and the tension wire insertion groove 20Y for Y-axis in the wooden structure 29 which consists of the pillar member 34 which joined the plurality of sawn boards 30. It is a sectional view showing an example in which a long wooden structure 29 is prestressed so as to be in a curved state. A cross-sectional view showing an example in which the buckling length is divided into three with respect to the length of the long wooden structure 29 by forming protrusions 21 at a plurality of locations (two locations) on the long wooden structure 29. It is. FIG. 2 is a partially cutaway plan view showing a conventional example in which prestressing is applied.

The prestressed long wooden structure of the present invention is
a sawn board forming step of forming a sawn board 30 in which the fiber direction is the longitudinal direction;
A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of the drawing board 30 with another drawing board 30, and a protrusion protrudes from both walls of the tensioned steel wire insertion groove 20 at the position where buckling occurs. a tension steel wire insertion groove forming step for forming 21;
a wooden structure construction step of configuring a wooden structure 29 by joining the milled board 30 with the tensioned steel wire insertion grooves 20 formed thereon and the grounded board 30 without the tensioned steel wire insertion grooves;
a tensioned steel wire fixing step of inserting the tensioned steel wire 28 of the prestressing device 36 into the tensioned steel wire insertion groove 20 and fixing the tensioned steel wire 28 at both ends of the wooden structure 29 by the fixing device 32;
and an axial compressive force applying step of applying an axial compressive force to the wooden structure 29 on the fixed tensioned steel wire 28 in contact with the protrusion 21 in the weak axis direction.

The prestressed elongated wooden structure consisting of the planar member 35 of the present invention is as follows:
a sawn board forming step of forming a sawn board 30 in which the fiber direction is the longitudinal direction;
a planar member forming step of forming a planar member 35 by joining sawn boards 30 whose fiber directions intersect with each other;
A tensioned steel wire insertion groove 20 is formed over the entire length of the plane member 35 at the joint surface with another member, and a protrusion 21 protrudes from both walls of the tensioned steel wire insertion groove 20 at the position where buckling occurs. forming a tension steel wire insertion groove;
a wooden structure configuring step of configuring a planar wooden structure 29 by joining the planar member 35 in which the tensioned steel wire insertion groove 20 is formed and another member in which the tensioned steel wire insertion groove 20 is not formed;
a tensioned steel wire fixing step of inserting the tensioned steel wire 28 of the prestressing device 36 into the tensioned steel wire insertion groove 20 and fixing the tensioned steel wire 28 at both ends of the wooden structure 29 by the fixing device 32;
and an axial compressive force applying step of applying an axial compressive force to the wooden structure 29 on the fixed tensioned steel wire 28 in contact with the protrusion 21 in the weak axis direction.

The prestressed elongated wooden structure consisting of the column member 34 of the present invention is
a sawn board forming step of forming a sawn board 30 in which the fiber direction is the longitudinal direction;
a pillar member forming step of joining a plurality of the ground boards 30 to form a pillar member 34;
Tensioned steel wire insertion grooves 20 are formed over the entire length in at least two joint surfaces with other members in the column member 34, and protrude from both walls of the tensioned steel wire insertion groove 20 at the position where buckling occurs. a tension steel wire insertion groove forming step for forming the protrusion 21;
a wooden structure construction step of joining the pillar member 34 with the tensioned steel wire insertion groove 20 and the pillar member 34 without the tensioned steel wire insertion groove to form a columnar wooden structure 29;
a tensioned steel wire fixing step of inserting the tensioned steel wire 28 of the prestressing device 36 into the tensioned steel wire insertion groove 20 and fixing the tensioned steel wire 28 at both ends of the wooden structure 29 by the fixing device 32;
and an axial compressive force applying step of applying an axial compressive force to the wooden structure 29 on the fixed tensioned steel wire 28 in contact with the protrusion 21 in the weak axis direction.

In order to be used when buckling occurs in the width direction of the wooden structure 19, the protrusions 21 protrude in the width direction of the ground board 30 from both walls of the tensioned steel wire insertion groove 20 at the buckling occurrence position. to form.

In order to be used when buckling occurs in a direction perpendicular to the width direction of the wooden structure 19, the protrusion 21 extends from both walls of the tensioned steel wire insertion groove 20 at the buckling occurrence position of the grated plate 30. It is formed to protrude in a direction perpendicular to the width direction.

In a wooden structure 29 in which a plurality of sawn boards 30 whose fiber direction is the longitudinal direction are joined together,
A tensioned steel wire insertion groove 20 is formed over the entire length on the joint surface of the drawn plate 30, and a protrusion 21 is formed that protrudes from both walls of the part where buckling occurs in the middle of the tensioned steel wire insertion groove 20, The wooden structure 29 is constructed by joining together a plurality of sawn plates 30 with and without the tensioned steel wire insertion grooves 20 and projections 21, and The tensioned steel wire 28 of the prestressing device 36 is inserted, and the tensioned steel wire 28 is fixed at both ends of the wooden structure 29 by the fixing device 32, and the tensioned steel wire 28 is attached in the direction of the weak axis of the protrusion 21. The wooden structure 29 is formed by applying an axial compressive force to the wooden structure 29 so that they are in contact with each other.

A wooden structure 29 formed by joining two or more planar members 35 formed by joining sawn boards 30 whose fiber directions are orthogonal to each other in the planar direction, and in which one of the planar members 35 to be joined is A tensioned steel wire insertion groove 20 is formed over the entire length of the joint surface, and protrusions 21 protruding from both walls of the tensioned steel wire insertion groove 20 at the buckling occurrence position are formed to form the tensioned steel wire insertion groove 20. A planar wooden structure 29 is constructed by joining the planar member 35 with the protrusion 21 and the planar member 35 without the protrusion 21, and inserts the tensioned steel wire of the prestressing device 36 into the tensioned steel wire insertion groove 20. 28, and the tensioned steel wire 28 is fixed by a fixing device 32 at both ends of the wooden structure 29. It consists of a body 29 to which an axial compression force is applied.

A wooden structure 29 formed by joining a plurality of sawn boards 30 in which the fiber direction is the longitudinal direction to constitute a column member 34, wherein at least two joint surfaces of the sawn boards 30 with other sawn boards 30 are bonded. A tensioned steel wire insertion groove 20 is formed over the entire length, and protrusions 21 protruding from both walls of the tensioned steel wire insertion groove 20 at the buckling occurrence position are formed, and one of the projections 21 is connected to the tensioned steel wire insertion groove 20. The other protrusion 21 is formed to protrude from both walls of the steel wire insertion groove 20 at the buckling occurrence position of the tensioned steel wire insertion groove 20 in the width direction of the drawing plate 30. are formed so as to protrude from both walls in a direction perpendicular to the width direction of the grated plate 30, and the grated plate 30 is formed with the tensioned steel wire insertion groove 20 and the protrusion 21, and the grated plate 30 is not formed. They are joined to form a columnar wooden structure 29, and the tensioned steel wire 28 of the prestressing device 36 is inserted into the tensioned steel wire insertion groove 20, and the tensioned steel wire 28 is fixed at both ends of the wooden structure 29. The tensioned steel wire 28 is fixed by a device 32, and an axial compressive force is applied to the wooden structure 29 in contact with the protrusion 21 in the direction of the weak axis.

Embodiment 1 of the present invention will be described below with reference to FIGS. 1 to 4.
1 and 2 show an elongated wooden structure 29 of the present invention. This wooden structure 29 is an example in which prestressing is applied to an LVL type 26 type structural beam material in which sawn boards 30 are laminated with (fiber) grains oriented in the same direction. It is shown in FIG. 3(a).
This elongated wooden structure 29 is, for example, a beam member 37 with a width of 220 mm, a thickness of 570 mm, and a length of 10 to 15 m. The thickness of the laminated sawn boards 30 is about 20 to 50 mm, and they are not only laminated in the thickness direction but also connected in the length direction by cutting the ends into a V-shape or the like as necessary.

As shown in FIGS. 1 and 2, the strained steel wire insertion groove 20 is formed in the ground plate 30, into which the strained steel wire 28 of the prestressing device 36 is inserted before being laminated. This tensioned steel wire insertion groove 20 has, for example, a width of 40 mm and a depth of 20mm, and in the middle of this tensioned steel wire insertion groove 20, there are protrusions that protrude inwardly (in the width direction) from the wall surfaces on both sides to oppose each other. 21 is formed. The protrusion 21 is formed into a chevron shape with a tensioned steel material contacting surface 23 and an inclined surface 22, and has a gap 33 between the tensioned steel material contacting surfaces 23 facing each other, which is large enough for the tensioned steel wire 28 to pass through. The length of the tensioned steel contact surface 23 and the inclined surface 22 is about 30 to 50 mm, and the protrusions 21 are formed at one or more positions depending on the buckling length of the wooden structure 29. Assuming that the diameter of the tensioned steel wire 28 made of stranded PC steel wire or the like is 17.8 mm, the width of the gap 33 is approximately 18 to 20 mm, which is slightly wider than the diameter of the tensioned steel wire 28. The inclined surface 22 is formed as gently as possible so as not to become a structural weakness when the wooden structure 29 is bent.

More specifically, assuming that the thickness of the tensioned steel wire 30 is 40 mm, the tensioned steel wire insertion groove 20 is about 20mm deep x 30 to 40mm wide, and as shown in FIG. A protrusion 21 is formed at a bent position of the wooden structure 29 in the groove 20.
In the embodiment shown in FIGS. 1 and 2, the protrusion 21 is composed of a straight tensioned steel contact surface 23 and an inclined surface 22. However, the present invention is not limited to this example, and as shown in FIG. The steel material contact surface 23 and the inclined surface 22 may be formed in an arcuate shape without a boundary. Further, as shown in FIG. 4(b), the tension steel contact surfaces 23 of the opposing protrusions 21 may be formed to be shifted by a predetermined distance B. It is desirable that this distance B is not too large.

As described above, the grated plates 30 with tensioned steel wire insertion grooves 20 and the grated plates 30 without tensioned steel wire insertion grooves 20 are sequentially stacked and joined as shown in FIGS. 3(a) and 3(b). .
After the lamination bonding is completed, the tensioned steel wire 28 of the prestressing device 36 is inserted into the gap 33 between the opposing protrusions 21 in the tensioned steel wire insertion groove 20, and the tensioned steel wire 28 is inserted into the tensioned steel wire insertion groove 20. Both ends are made to protrude from both sides of the grinding board 30.
The laminated position of the grated plates 30 in which the tensioned steel wire insertion grooves 20 are formed is the center position in the width direction of the wooden structure 29, but it may be approximately in the center in the thickness direction, or it may be in a position slightly shifted up and down. .
A plate 31 and a fixing device 32 are fitted into the tensioned steel wire 28 protruding from both ends, and a prestress is applied to the wooden structure 29 by applying a predetermined load. Then, the wooden structure 29 tends to buckle if the introduced prestress force exceeds the buckling load of the wooden structure 29, but the tensioned steel wire 28 does not close to the gap 33 as shown in FIG. Further bending deformation is suppressed by coming into close contact with the tensile steel material contact surface 23 on the weak axis side that is about to buckle, resulting in a long wooden structure 29 that does not buckle, thereby preventing lateral warping.

In the first embodiment shown in FIGS. 1 to 4, the wooden structure 29 is an example of a beam member 37 with a width of 220 mm, a thickness of 570 mm, and a length of 10 to 15 m, so buckling occurs in the width direction where the thickness is thinner. Although this is likely to occur, in the second embodiment, an example in which flat members 35 as shown in FIGS. 5 and 6 are joined will be described.
As shown in FIG. 5, the present invention can also be applied to a wooden structure 29 made of planar members 35 laminated and bonded so that the fiber directions of the sawn boards 30 are orthogonal to each other.
In addition, in FIG. 5, the length in the X direction and the Y direction is shorter than the thickness in the Z direction for the purpose of explaining the drawing, so it is represented as a member that does not buckle, but the thickness in the X direction and The present invention is applied when the length in the Y direction is sufficiently long and there is a possibility that buckling will occur.
In FIG. 5, tensioned steel wire insertion grooves 20 and protrusions 21 are formed in the X-direction grounding plate 30 and the Y-direction drawing board 30, respectively, before lamination. The tensioned steel wire 28 of the prestressing device 36 is inserted into the tensioned steel wire insertion groove 20 and the projection 21, respectively, so that both ends of the tensioned steel wire 28 protrude from both sides of the drawing plate 30.
A plate 31 and a fixing device 32 are fitted into the tensioned steel wire 28 protruding from both ends of the tensioned steel wire insertion groove 20, and a prestress is applied to the wooden structure 29 by applying a predetermined load. Then, the wooden structure 29 made of the planar member 35 is prestressed and becomes a long wooden structure 29 that does not buckle in either the X direction or the Y direction, and lateral warping is prevented.

FIG. 6 shows an example in which two planar members 35 similar to those shown in FIG. At the same time, protrusions 21 are formed that protrude from both walls of the tensioned steel wire insertion groove 20 at the position where buckling occurs.
A planar wooden structure 29 is constructed by joining the planar member 35 in which the tensioned steel wire insertion groove 20 is formed and another planar member 35 in which the tensioned steel wire insertion groove 20 is not formed.
By inserting the tension steel wire 28 of the prestressing device 36 into the tension steel wire insertion groove 20 and tensioning the tension steel wire 28 with a jack or the like, an axial compressive stress is applied to the wooden structure 29, and the tension steel Both ends of the wire 28 are fixed at both ends of the wooden structure 29 by a fixing device 32.
In this way, a wooden structure 29 made of a flat member 35 that does not buckle is obtained.
In addition, in FIG. 6, although the joint surface where the tensioned steel wire insertion groove 20 is formed is shown as being short, it is highly effective against a long joint surface that may cause buckling.

7 and 8 are examples in which the present invention is applied to a column member 34 having substantially the same thickness in the vertical and horizontal directions.
In FIG. 8, when the column member 34 has substantially the same thickness in the vertical and horizontal directions, it is unclear whether the direction in which buckling occurs is the X direction or the Y direction in the figure. Therefore, for example, the protrusion 21 (upper side in the figure) of one of the X-axis tensioned steel wire insertion grooves 20X is designed such that prestress is applied in the X direction (lateral direction) to cause buckling. It is formed so as to protrude from both walls of the position in the width direction of the board 30.
Further, the protrusion 21 (lower side in the figure) of the other Y-axis tensioned steel wire insertion groove 20Y is formed so that prestress acts in the Y direction (vertical direction). With such a configuration, it can be configured to function for buckling in any of the X and Y directions.

In FIG. 7, a column member 34a on the left side and a column member 34b on the right side are joined to form a column member 34 having substantially the same thickness in the vertical and horizontal directions, and a tension steel wire insertion groove 20X for the X axis and a tension steel wire for the Y axis are inserted. An example in which a groove 20Y is formed is shown.
In (a), an X-axis tensioned steel wire insertion groove 20X is formed on the upper side of the left column member 34a, a Y-axis tensioned steel wire insertion groove 20Y is formed on the lower side, and an upper side of the right column member 34b is formed. An example is shown in which an X-axis tensioned steel wire insertion groove 20X is formed and a Y-axis tensioned steel wire insertion groove 20Y is formed on the lower side.
(b) shows an example in which an X-axis tensioned steel wire insertion groove 20X is formed on the upper side of the left column member 34a, and a Y-axis tensioned steel wire insertion groove 20Y is formed on the lower side of the right column member 34b. ing.
In (c), an X-axis tensioned steel wire insertion groove 20X is formed on the upper side of the left column member 34a, a Y-axis tensioned steel wire insertion groove 20Y is formed on the lower side, and an upper side of the right column member 34b is formed. An example is shown in which a Y-axis tensioned steel wire insertion groove 20Y is formed and an X-axis tensioned steel wire insertion groove 20X is formed on the lower side.
(d) shows an example in which an X-axis tensioned steel wire insertion groove 20X is formed above the left column member 34a, and a Y-axis tensioned steel wire insertion groove 20Y is formed above the right column member 34b. There is.
In (e), an X-axis tension steel wire insertion groove 20X is formed on the upper side of the joint surface between the left column member 34a and the right column member 34b, and a Y-axis tension steel wire insertion groove 20Y is formed on the lower side. An example is shown.
(f) shows an example in which a Y-axis tensioned steel wire insertion groove 20Y is formed on the lower side of the left column member 34a, and an X-axis tensioned steel wire insertion groove 20X is formed on the upper side of the right column member 34b. ing.
The above is an example, and other similar configurations are possible.

In FIG. 9, when the width of the gap 33 between the two sets of projections 21 is widened and prestress is applied to the wooden structure 29, the elongated wooden structure 29 is actively curved by a distance C. An example of a wooden structure 29 is shown.

In FIG. 10, not only one projection 21 is formed approximately at the center of the tensioned steel wire insertion groove 20 formed in the wooden structure 29, but also projections 21 are formed at every distance D of the tensioned steel wire insertion groove 20. A prestress may be applied to the protrusion 21 by passing the tensioned steel wire 28 therethrough.

In addition, when the thickness of the grated plate 30 is the depth at which the tensioned steel wire insertion groove 20 is formed, the gap between the opposing surfaces of the two left and right grated plates 30 laminated in the same layer is defined as the The tensioned steel wire insertion groove 20 may also have a protrusion 21 .

DESCRIPTION OF SYMBOLS 10... Elongated structure, 11... Through hole, 12... Tensile material, 13... Plate, 14... Fixing device (nut), 18... Tensile material position holding piece, 19... Fitting recessed part, 20... Tensioned steel wire insertion groove , 20X...X-axis tensioned steel wire insertion groove, 20Y...Y-axis tensioned steel wire insertion groove, 21...Protrusion, 22...Slanted surface, 23...Tensioned steel material contact surface, 24...Groove processing mold, 25...Gap formation Type, 26... LVL type, 27... CLT type, 28... Tensioned steel wire, 29... Wooden structure, 30... Chipboard, 31... Plate, 32... Fixing device, 33... Gap, 34... Pillar member, 35... Plane Member, 36... Prestress device, 37... Beam member.

Claims (8)

a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
A tensioned steel wire insertion groove is formed over the entire length on the joint surface of one of the drawn plates with the other drawn plate, and a groove protrudes from both walls at a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion;
a wooden structure construction step of configuring a wooden structure by joining the one sawn board in which the tensioned steel wire insertion groove is formed and the other ground board in which the tensioned steel wire insertion groove is not formed;
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. A method for manufacturing a prestressed wooden structure, comprising the step of applying an axial compressive force to both ends of the body using a fixing device. a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
a planar member forming step of forming a planar member by joining the plurality of sawn boards whose fiber directions intersect with each other;
A tensioned steel wire insertion groove is formed over the entire length of the joint surface of one of the grounding plates forming the planar member with the other drawing board, and a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion protruding from both walls;
A wooden structure construction step of forming a planar wooden structure by joining the one sawn board with the tensioned steel wire insertion groove formed therein and the other grounded board without the tensioned steel wire insertion groove formed therein. and,
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. A method for manufacturing a prestressed wooden structure, comprising the step of applying an axial compressive force to both ends of the body using a fixing device. a sawn board forming step of forming a plurality of sawn boards with the fiber direction in the longitudinal direction;
a pillar member forming step of joining the plurality of sawn boards to form a pillar member;
Tensioned steel wire insertion grooves are formed over the entire length in at least two joint surfaces of the other one of the two grated plates forming the column member, and the tensioned steel wire insertion grooves are formed at nodes of buckling deformation. a step of forming a tensioned steel wire insertion groove to form a protrusion protruding from both walls at the desired position;
a wooden structure construction step of forming a columnar wooden structure by joining the one column member in which the tensioned steel wire insertion groove is formed and the other pillar member in which the tensioned steel wire insertion groove is not formed;
A tensioned steel wire of a prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are inserted into the wooden structure. A method for manufacturing a prestressed wooden structure, comprising the step of applying an axial compressive force to both ends of the body using a fixing device. The prestressing plate according to claim 1, 2 or 3, wherein the protrusions are formed so as to protrude in the width direction of the grated board from both walls at positions where the tensioned steel wire insertion grooves are desired to be nodes of buckling deformation. A method of manufacturing a wooden structure. 2. The protruding portion is formed to protrude from both walls in a direction perpendicular to the width direction of the ground board at a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. 3. The method for manufacturing a prestressed wooden structure according to 3. In a wooden structure made by joining multiple sawn boards with the fiber direction in the longitudinal direction,
A tensioned steel wire insertion groove is formed over the entire length of the joint surface of one of the drawn plates with the other drawn plate, and a tensioned steel wire insertion groove is formed in the middle of the tensioned steel wire insertion groove from both walls at a position desired to be a node of buckling deformation. A protruding protrusion is formed, and the wooden structure is formed by joining a plurality of sawn plates having the tensioned steel wire insertion groove and the protrusion formed thereon and a sawn board having the tensioned steel wire insertion groove and the protrusion not formed. The tensioned steel wire of the prestressing device is inserted into the tensioned steel wire insertion groove and the tensioned steel wire is tensioned to apply axial compressive stress to the wooden structure, and both ends of the tensioned steel wire are is fixed by a fixing device at both ends of the wooden structure, and an axial compressive force is applied to the wooden structure so that it contacts the tensioned steel wire in the direction of the weak axis of the protrusion. Prestressed wood structure. A wooden structure formed by joining two or more planar members in the planar direction, each of which is formed by joining a plurality of sawn boards whose fiber directions are orthogonal to each other, and the joining of one of the planar members to be joined. A tensioned steel wire insertion groove is formed on the surface over the entire length, and a protrusion protruding from both walls is formed at a position where the tensioned steel wire insertion groove is desired to be a node of buckling deformation. A planar wooden structure is constructed by joining a planar member on which a protrusion is formed and a planar member on which the tensioned steel wire insertion groove and no protrusion are formed, and a prestressing device is installed in the tensioned steel wire insertion groove. An axial compressive stress is applied to the wooden structure by inserting a tensioned steel wire and tensioning the tensioned steel wire, and both ends of the tensioned steel wire are fixed at both ends of the wooden structure by a fixing device. A prestressed wood structure characterized by consisting of. A wooden structure formed by joining a plurality of sawn boards whose fiber direction is in the longitudinal direction to form a column member, wherein at least two joints of one sawn board forming the pillar member and the other sawn board form the pillar member. A tensioned steel wire insertion groove is formed on the surface over the entire length, and protrusions protruding from both walls are formed at positions desired to be nodes of buckling deformation of the tensioned steel wire insertion groove, and one of the projections is The other protrusion is formed to protrude in the width direction of the board from both walls at positions desired to be nodes of buckling deformation of the tensioned steel wire insertion groove, and the other protrusion is formed to prevent buckling deformation of the tensioned steel wire insertion groove. The tensioned steel wire insertion groove and the tensioned steel wire insertion groove are formed by protruding from both walls in a direction perpendicular to the width direction of the board at the position where the deformation node is desired, and have the tensioned steel wire insertion groove and the protrusion formed therein. A column-shaped wooden structure is constructed by joining a sawn board with no protrusions, and the tensioned steel wire of the prestressing device is inserted into the tensioned steel wire insertion groove to tension the tensioned steel wire. A prestressed wooden structure characterized by applying axial compressive stress to the wooden structure and fixing both ends of the tensioned steel wire at both ends of the wooden structure using a fixing device.

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