JP2012077567A - Composite beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite beam which is a main member in a conventional framework construction method of a wooden house or the like and is to be joined to a metallic material inserted to a column.SOLUTION: For the composite beam, a light-gauge channel for a beam material is formed by bending a strip-shaped steel plate in a light-gauge channel shape in the longitudinal direction, is provided with a plurality of bolt holes 4 on webs 1 at both longitudinal end parts, and is provided with a plurality of projection parts 1a on the web back side other than the vicinity of the bolt holes 4 of the webs 1. In the roughly light-gauge channel having nail holes 7 at a prescribed interval on a lip 3 extending outwards from the distal end of upper and lower flanges 2 of the light-gauge channel, a pair of the roughly light-gauge channel webs 1 are piled up with each other, the projection parts 1a of the webs are integrated by connection of caulking 5, a cross section is formed into an approximately H shape, lumber 6 is inserted between the lips 3 extending from the upper and lower flanges 2, and the lumber 6 is fixed with nails 8 from the nail holes 7 provided on the lips 3.

Description

The present invention relates to a composite beam (beam cross-section) that is joined to a hardware (plate shape) that is previously inserted into a wooden pillar at a joint between a pillar and a beam of a main member in a conventional frame construction method such as a wooden house. The center part of this is a steel plate, and the upper and lower beams use small-diameter wood) and its manufacture.

Conventionally, most residential buildings are wooden buildings, and most of them are framed. Other than the three-story structure of the wooden frame construction method, there are few legal restrictions, and structural designers were able to design and construct freely without any intervention from the design stage, so there was a great deal of structural variation. is the current situation. However, since the Great Hanshin-Awaji Earthquake, research on the traditional frame construction method, which was heavily damaged, has increased rapidly, and detailed design methods are being completed. In recent years, the CO2 absorption effect in forests (in the case of young trees) has attracted attention in the environment, and the CO2 emission allowance due to forest conservation and the activation of forestry that also serves as regional regeneration through forestry promotion have been screamed. On the other hand, large-diameter timber and qualitatively superior timber are no longer available as natural wood, and small-diameter wood logs such as thinned wood are effectively used. A laminated material obtained by laminating and bonding a plurality of layers (also referred to as a ground plate) is widely used for structural materials such as columns and beams in wooden buildings.

The government is approaching environmental conservation and utilization of idle resources, and the Ministry of Agriculture, Forestry and Fisheries has shown a policy of aiming for a timber self-sufficiency rate of 50% or more in 10 years in the agriculture and forestry / forestry regeneration plan compiled last year. The “Wood Utilization Promotion Bill” clearly states that the national and local governments will take the initiative in using domestically produced timber, and is considering making it mandatory for schools and government buildings built by the government. However, even if we want to make public buildings and private non-housing large-scale structures made of wood, we cannot divert the technology of wooden houses that have accumulated due to the difference in scale. In other words, the current situation is that large-scale wooden techniques are not systematized.

The frame construction method for wooden houses, etc. is a construction method in which a frame is first composed of columns and beams, and walls and floors are attached to it. There are “through columns” and “tube columns” in the columns, and the structural role of the columns is to support vertical loads in both the through columns and tube columns, resist compressive and tensile forces acting on the outer periphery as load bearing walls, and It is to prevent deformation at the outer wall surface that receives wind pressure (horizontal force).

2. Description of the Related Art Conventionally, through columns in a frame construction method such as a wooden house insert a beam in the middle of the column, the cross-sectional defect of the column is large, bending strength cannot be expected, and tensile force is often insufficient. Therefore, in order to ensure the required performance in the Building Standard Law Related Notification No. 1460, the joints and joints clearly specify reinforcements and sub-assemblies in combination with hozos and lacks.

In recent years, in Japanese Unexamined Patent Publication No. 2007-284944 (first known example), the laminated wood is expensive and expensive compared to lumber, so there are no advantages of the laminated wood (there is no concern about strength reduction due to cracks like solid wood) It is possible to realize a large cross-section wooden beam, which was difficult with lumbering, and because the weak points are dispersed, the variation in strength and rigidity is small, so the design can be rationalized, etc.) A wooden beam reinforced with a steel plate by combining a plurality of lumbers has been disclosed for the purpose of reducing the cost while making use of it.

Japanese Utility Model Publication No. 57-1119021 (second publicly known example) discloses a method of increasing the efficiency of wood mounting work as a composite crosspiece for a house wall, although it is not a beam.

JP 2007-284944 A Shokai 57-1119021

However, the laminated wood that is often used for structural materials such as pillars and beams in wooden buildings is expensive because only high-strength tree species of lamina (grinding board) are used. An efficient cross-sectional shape is selected from a range of tree species. However, this increases management and increases inventory. Furthermore, it is necessary to manage lamina warpage, cracking, and knotting, and ensuring strength and cost are inversely proportional, and efforts are being made to reduce costs, but they are still more expensive than lumber products. In addition, there is a possibility that water will be absorbed from the wooden mouthpiece, and it is necessary to deal with rainy weather at the construction site (curing management of material storage, discontinuation of construction, etc.).

Next, in the case of the first known example, a plurality of lumber products are stacked in the beam forming direction and fixed to the steel plates arranged on the side surfaces of the plurality of lumber products with a scissors, but each lumber product is warped.・ It has defects such as cracks, joints, bends and twists, and of course it can be assembled considering the defects of each lumber product, but it is difficult to keep dimensional accuracy in terms of cost, and the lumber product at the time of assembling There is a possibility that the steel plate is fitted and fixed to the ridge, and quality problems such as the shape, bending, and twisting of the member may occur.

Further, in the case of the second known example, in the cited document devised as a composite bar material for a housing wall, a strip-like plate-like body 20 is provided for each portion where spots are provided between the plate-like bodies 15a and 15b. The order of manufacturing is such that the long plate-like body 15 is assigned an allocation position and the strip-like plate-like body 20 is combined. Then, temporary attachment is performed while paying attention to the position of the strip-like plate-like body 20 (interval, right angle, in / out, etc.). After the temporary attachment, it is considered to be a process of checking the shape of the member (bending, spacing, right angle, entering / exiting, etc.) and checking the dimensional accuracy, then spotting and inspecting the product. Can be cumbersome and costly. In addition, the timber 14 is brought into contact with the sword tip 22 and fixed with a jig or other tool such as a press. However, depending on the type of wood and the state of curing, there is a risk that the timber will break, and the product dimensions and construction Although it is not clear where the error is adjusted, it is not certain. However, when a plurality of composite crosspieces are assembled, it seems that the smoothness of the decorative plywood 24 on the finished surface cannot be maintained.

The problem to be solved by the present invention is to solve the above-mentioned problems of quality and cost, and further to solve the technical problems of large-scale buildings that could not be handled by conventional wooden beams. It is. Moreover, while promoting the utilization of low-strength tree species such as cedar, it provides a synthetic beam with an efficient cross-sectional shape and high cross-sectional performance at a low cost.

  As a result of studying to solve the above problems, the present inventor uses a steel plate for the part requiring bending strength and tensile strength, and a technique using a small-diameter wood for the part requiring accommodation. Gained knowledge. Specifically, beams in wooden houses are subjected to bending stress due to the load of furniture and residents inside the house, resulting in bending stress, compressive stress on the upper side of the beam, and tensile stress on the lower side. Has occurred. Therefore, high-strength tree bay pine and the like are used in conventional wooden house beams. In the technique of the present invention, a steel plate is used as a location to deal with stress, and a low-strength tree species is used as a joint location at a beam teno or the like. In other words, by making use of the characteristics of each material, it has been conceived that both the securing of strength and the utilization of low-strength tree species can be achieved. The gist is as follows.

(1) A belt-shaped steel plate is formed into a light grooved steel shape along the longitudinal direction, and has a plurality of bolt holes in the web at both ends of the longitudinal direction. Is a light groove-shaped steel for beam material having a plurality of protrusions, and has a nail hole at a predetermined interval on a lip extending outward from the top and bottom flange ends of the light groove-shaped steel. A substantially light groove-shaped steel, wherein a pair of the light groove-shaped steel webs are polymerized, the web protrusions are integrated by caulking, and the cross section is formed in a substantially H shape, The present invention relates to a composite beam characterized in that wood is inserted between lips extending from the lip, and the wood is fixed with a nail from a nail hole provided in the lip, and more preferably, the center of the lip described above A groove having a convex surface curved inward in the vicinity of the portion Masui.

(2) The present invention relates to a composite beam characterized in that a long auxiliary material having a U-shape is inserted inside the substantially H-shaped lip, and more preferably, the U-shape. It is desirable to provide a groove or the like with the convex surface curved inward in the vicinity of the center of the short side of the shape.

(3) A strip-shaped steel plate is first bent into a light groove shape along the longitudinal direction, and a plurality of bolt holes are provided on the webs at both ends of the longitudinal direction. Is a light groove-shaped steel for a beam material having a plurality of protrusions, and a lip extending outward from the top and bottom flange ends of the light groove-shaped steel is provided with nail holes at predetermined intervals. In a substantially light groove-shaped steel, a pair of the light groove-shaped steel webs are superposed, the protrusions of the web are integrated by caulking, the cross section is formed in a substantially H shape, and then extended from the upper and lower flanges. The present invention relates to a method of manufacturing a composite beam, wherein wood is inserted between existing lips, and the wood is fixed with a nail from a nail hole provided in the lip, and in the above, a convex surface is provided on the lip. A structure in which a groove or the like curved inward is preferable.

(4) The present invention relates to a method for manufacturing a composite beam, characterized in that a long steel plate bent into a U-shape is inserted inside the substantially H-shaped lip, A structure in which a groove having a convex surface curved inward is provided on the short side of the U shape.

(A) According to the composite beam according to the present invention, the metal piece (plate shape) inserted on the center line of the wooden column, the composite beam, and the brace have an axial center in the same direction. Structure. Therefore, with a strong bearing wall of the axial force system, it is possible to rationally design with an emphasis on earthquake resistance and durability, resulting in a tenacious structure. Further, unlike the conventional wooden beam, there are obtained effects such as little creep phenomenon (floor deflection does not return to its original state).

(B) According to the composite beam according to the present invention, when a wooden through-column is made into a large cross section, a ramen-based bearing wall with semi-rigid connection can be formed. Specifically, the double web of the composite beam is inserted into a metal piece (plate shape) inserted on the center line of the through pillar having a large cross section. That is, the plate (metal) resists bending stress by fastening the two webs in the sandwich state with bolts. Therefore, a structure with a large span is possible even in a place other than a wooden house, etc., and a design that emphasizes earthquake resistance and durability can be rationally performed, and a tenacious structure can be obtained.

(C) The composite beam according to the present invention is a composite beam in which both strength can be secured and low-strength tree species can be utilized by utilizing each feature by combining different materials. For example, a steel plate is processed and used for the part where strength is required, and cedar or the like is placed at a joint portion between the beam and a stud such as a stud to form an efficient cross section. Therefore, it is possible to cope with long spans, obtain a highly practical composite beam with high cross-sectional performance and low cost, and use low-strength tree species such as cedar with abundant domestic forest resources. Utilization can be promoted for effective utilization.

(D) According to the composite beam according to the present invention, the joint (shape) in the conventional method at the joint portion of the pair of light groove shaped steel beams is the joint between the double web backs at both ends of the light groove shaped steel beam. A gusset plate (single plate) is inserted and fastened with bolts or the like. Further, a plurality of short plate (paddle) equivalent to the thickness of the gusset plate is inserted between the two web backs of the intermediate portion of the light grooved steel to form a beam, and the gusset plate and the The axis of the light groove shaped steel beam coincides. However, in the case of the present invention, the axial center of the composite beam and the gusset plate coincide with each other even without a paddle. Therefore, since a board is unnecessary, the weight of the steel material is reduced, the manufacturing process is shortened, and the production efficiency is increased. In addition, quality control is simplified. That is, a composite beam can be obtained at a low cost.

It is a schematic diagram which shows the 1st Example of the composite beam which concerns on this invention, (a) is AA sectional drawing, (b) is BB sectional drawing, (c) is CC top view. . It is explanatory drawing which shows an example of the manufacturing process of the substantially light groove-shaped steel which forms the composite beam of 1st Example, (a) is before the process of the projection part web of a substantially light groove-shaped steel, (b) is protrusion. It is a schematic diagram after the processing of the partial web. It is a schematic diagram which shows the 2nd Example of the composite beam which concerns on this invention, (a) is AA sectional drawing, (b) is BB sectional drawing. It is explanatory drawing which shows an example of the manufacturing process of the substantially light groove-shaped steel which forms the composite beam of a 2nd Example, (a) is before the process of the protrusion web of a substantially light groove-shaped steel, (b) is protrusion. It is a schematic diagram after the processing of the partial web. It is a schematic diagram which shows the 2nd Example of an auxiliary material.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
In addition, as a material of the steel plate for synthetic beams, a hot dip galvanized steel plate, a molten 55% aluminum-zinc alloy plated steel plate and the like are desirable, but are not particularly limited. The machine to be manufactured is not particularly limited. For example, as a method of forming the shape of the light grooved steel, it can be formed by any one of a pultrusion method, a press method, a roll forming method, and the like. The wood material can be selected from low-strength tree species such as cedar.

Example 1
FIG. 1 is a schematic view showing a first embodiment of a composite beam according to the present invention, where (a) is a cross-sectional view taken along the line AA, (b) is a cross-sectional view taken along the line BB, and (c) is a cross-sectional view taken along the line CC. FIG. 2 is an explanatory view showing an example of a manufacturing process of a substantially light groove-shaped steel forming a composite beam, (a) is before processing a protrusion web of the substantially light groove-shaped steel, and (b) is a protrusion. It is a schematic diagram after the processing of the partial web. In this example, the web 1, the hat web 1 a, the flange 2, the lip 3, the curved groove 3 a, the bolt hole 4, the crimp 5, the wood 6, the nail hole 7, and the nail 8 are configured. Hereinafter, it demonstrates along this.

First, a substantially light groove steel is manufactured, but before bending the long steel plate, drilling of the nail hole 7 having a diameter of about 4.5 mm is performed at intervals of about 300 mm in the vicinity of both ends of the long side of the steel plate. . Next, as shown in FIG. 2 (a), the long steel plate in which the nail hole 7 is processed is bent into a U-shape along the longitudinal direction to form the web 1 and the flange 2, and The ends of the U-shaped upper and lower flanges 2 are bent at right angles up and down to form a lip 3. At that time, the vicinity of the center of the lip 3 is formed in the shape of the curved groove 3a.

A part of the lip 3 is formed into a curved groove 3a, as shown in FIG. 1 (b) and the like, in a cross section in which the substantially light groove steel is paired, between the curved grooves 3a. This is because, when the wood 6 slightly larger than between the curved grooves 3a is inserted, the wood 6 is held by the effect of the springback action.

As the spring back function, the shape of the curved groove 3a is shown as a representative. However, the present invention is not limited to this, and the same function as that of the curved groove 3a (when wood is sandwiched by the spring back function) Any known method can be used as long as satisfactory pinching strength can be obtained. For example, the groove | channels, such as a triangle, trapezoid, semicircle, a semi-elliptical shape, and an arcuate shape, can be mentioned.

Next, as shown in FIG. 2B, the entire surface of the web 1 is drawn at a predetermined interval to produce a plurality of lunch box-shaped hat-shaped webs 1a. As shown in FIG. 1, the bent box-shaped hat-shaped web 1a and the web 1 are stepped, as shown in FIG. 1, in which both ends of the composite beam having a slit shape are inserted into columns (not shown). This is because the two webs 1 are inserted into and fitted together to form a sandwich shape. Therefore, the column and the beam are integrated and firmly connected by the action of the bolt (not shown) inserted into the bolt hole 4 of the web 1 and tightened. The squeezing depth of the lunch box-shaped hat-shaped web 1a is about half that of a plate (not shown) inserted into the column. That is, as shown in FIG. 1C, a gap is formed between adjacent lips 1 by superposing the web protrusions 1a into a pair, and the gap is inserted into the column. -It becomes a thick space. Therefore, the squeezing depth of the lunch box-like hat web 1a is about half of the gusset plate thickness.

The positions, shapes, dimensions, etc. of the web 1 and the lunch box-shaped hat-shaped web 1a are determined according to various conditions during design. For example, first, the frame construction method (axial force system / ramen system, etc.) is determined, and then the design load, external force, etc. are calculated to determine the cross-sections of through columns, beams and the like. The composite beam end web 1 has a shape and dimensions that match the plate (not shown) inserted in the column. In the case of an axial load bearing wall at the intermediate part of the composite beam, When the position of the bearing wall brace is determined, the position of the tube column is determined, and from this, the position, shape, dimensions, etc. of the hat-shaped web 1a are determined with reference to the position of the tube column. That is, a pipe column mounting plate and brace gusset plate (not shown) is inserted into the gap between the double webs 1 at the tube column position of the composite beam, and bolts are inserted between the sandwich-shaped twin webs. Tightening is carried out (not shown), but the location adjacent to the web 1 that is in contact with the gusset plate is the position of the hat-type web 1a. Further, in the case of a ramen bearing wall, the pipe pillars and braces are unnecessary, so the webs 1a are provided at predetermined equal intervals. Intervals that can be suppressed against twisting in the direction. Thereby, the synthetic beam which can be firmly fixed between the webs of the substantially light groove-shaped steel can be made. The size of the substantially light groove-shaped steel is determined by various conditions at the time of design. The web dimension is about 200 to 600 mm, the flange dimension is about 50 to 100 mm, and the length can be made to about 3 to 12 m. The thickness is about 1.6 to 6.0 mm.

Subsequently, the substantially light groove-shaped steel manufactured as described above is assembled to form a substantially H-shape. First, as shown in FIG. 1, the webs 1 of substantially light groove-shaped steels arranged back to back are superposed to confirm the position of the web 1, the presence or absence of a horizontal step of the flange 2, the contact status of the web 1 a, etc. As shown in FIG. 1 (b) and FIG. 1 (c), a caulking process 5 is applied to a predetermined position of the polymerized web 1a to produce a substantially fixed substantially H-shaped shape steel. Examples of the fixing means include caulking, tightening with bolts and nuts, screwing, welding, and the like, but any known method may be used as long as a required strength is obtained. Further, the intervals for caulking and the like are arranged and processed in a well-balanced manner in consideration of the strength (allowable proof stress) per piece. The H-shaped steel can be manufactured to a web size of about 200 to 600 mm, a flange size of about 100 to 200 mm, and a length of about 3 to 12 m.

As shown in FIG. 1, the wood 6 in which both ends of the wood 6 are slit in advance is inserted between the upper and lower lips 3 of the H-shaped steel. In this case, the width of the wood 6 is made slightly larger than between the curved grooves 3a. By inserting the wood 6 between the curved grooves 3a, the lips 3 on both sides are slightly opened, and the wood 6 is held by the effect of the spring back action of the lip 3. Subsequently, the nail 8 or the like is inserted into the nail hole 7, but since the warp of the wood 6 is held in advance by the convex surface of the curved groove 3a, the fluctuation of the wood 6 during the tightening operation of the nail 8 etc. This makes it possible to easily perform the installation work and improve the work efficiency. The fixing means includes nails, wood screws, glue ram rivets, draft pins, lug screws, bolts and nuts, etc., but any known method may be used as long as the required strength is obtained.

The above-described slits for machining the both ends of the wood 6 are mainly for braces in the axial force system (strut) construction method, and are slits through which the gusset plate penetrates. -In the case of men, etc., a slit may be unnecessary.

(Example 2)
3A and 3B are schematic views showing a second embodiment of the composite beam according to the present invention, in which FIG. 3A is a cross-sectional view taken along the line AA, FIG. 3B is a cross-sectional view taken along the line BB, and FIG. It is explanatory drawing which shows an example of the manufacturing process of the substantially light groove-shaped steel to do, (a) is before the process of the protrusion web of a substantially light groove-shaped steel, (b) is a schematic diagram after the process of a protrusion web. . In this example, it comprises a web 1, a hat-shaped web 1 a, a flange 2, a lip 3, a curved groove 3 a, a bolt hole 4, a caulking 5, a wood 6, a nail hole 7, a nail 8 and an auxiliary material 9. Hereinafter, it demonstrates along this.

First, a substantially light groove steel is manufactured, but before bending the long steel plate, drilling of the nail hole 7 having a diameter of about 4.5 mm is performed at intervals of about 300 mm in the vicinity of both ends of the long side of the steel plate. . Next, as shown in FIG. 4 (a), the long steel sheet in which the nail holes 7 are processed is bent into a U-shape along the longitudinal direction to form the web 1 and the flange 2, and The tips of the U-shaped upper and lower flanges 2 are bent at right angles to form the lip 3.

Next, as shown in FIG. 4B, the entire surface of the web 1 is drawn at a predetermined interval to produce a plurality of lunch box-like hat webs 1a. As shown in FIG. 3, the bent box-shaped hat-shaped web 1a and the web 1 are stepped, as shown in FIG. 3, with both ends of the composite beam having a slit shape inserted into columns (not shown). This is because the two webs 1 are inserted into and fitted together to form a sandwich shape. Therefore, the column and the beam are integrated and firmly connected by the action of the bolt (not shown) inserted into the bolt hole 4 of the web 1 and tightened. The squeezing depth of the lunch box-shaped hat-shaped web 1a is about half that of a plate (not shown) inserted into the column. That is, as shown in FIG. 1C, a gap is formed between adjacent lips 1 by superposing the web protrusions 1a into a pair, and the gap is inserted into the column. -It becomes a thick space. Therefore, the squeezing depth of the lunch box-like hat web 1a is about half of the gusset plate thickness.

The positions, shapes, dimensions, etc. of the web 1 and the lunch box-shaped hat-shaped web 1a are determined according to various conditions during design. For example, first, the frame construction method (axial force system / ramen system, etc.) is determined, and then the design load, external force, etc. are calculated to determine the cross-sections of through columns, beams and the like. The composite beam end web 1 has a shape and dimensions that match the plate (not shown) inserted in the column. In the case of an axial load bearing wall at the intermediate part of the composite beam, When the position of the bearing wall brace is determined, the position of the tube column is determined, and from this, the position, shape, dimensions, etc. of the hat-shaped web 1a are determined with reference to the position of the tube column. That is, a pipe column mounting plate and brace gusset plate (not shown) is inserted into the gap between the double webs 1 at the tube column position of the composite beam, and bolts are inserted between the sandwich-shaped twin webs. Tightening is carried out (not shown), but the location adjacent to the web 1 that is in contact with the gusset plate is the position of the hat-type web 1a. In the case of a ramen bearing wall, the pipe 1 and the brace are not required, so the webs 1a are provided at predetermined equal intervals. The intervals are balanced in consideration of the joining strength of the caulking process 5 and the like. Arrange well. Thereby, the synthetic beam which can be firmly fixed between the webs of the substantially light groove-shaped steel can be made. The size of the substantially light groove-shaped steel is determined by various conditions at the time of design. The web dimension is about 200 to 600 mm, the flange dimension is about 50 to 100 mm, and the length can be made to about 3 to 12 m. The thickness is about 1.6 to 6.0 mm.

On the other hand, the auxiliary material 9 is manufactured in a separate process. First, before bending the long steel plate, drilling of the nail holes 7 is performed in the vicinity of both ends of the long side of the steel plate. As shown in FIG. It is placed. Therefore, the interval between the nail holes 7 is matched with the nail hole 7 of the lip 3 and the nail hole diameter is slightly larger than the nail hole diameter 7 in consideration of manufacturing errors. Next, as shown in FIG. 5, the auxiliary steel 9 is manufactured by bending the long steel plate in which the nail hole 7 is processed into a U shape along the longitudinal direction. At this time, the vicinity of the central portion of the short side of the auxiliary material 9 is applied to the shape of the curved groove 3a.

A part of the short side of the auxiliary material 9 is formed into a curved groove 3a, as shown in FIG. 3B or the like, in the cross section of the auxiliary material 9 placed on the flange 2, This is because, when the wood 6 slightly larger than between the curved grooves 3a is inserted between the grooves 3a, the wood 6 is held by the effect of the springback action. The size of the reinforcing material is determined by various conditions at the time of design, but the web size is about 91.0 mm to 188.0 mm, the flange size is about 40 to 70 mm, and the length can be manufactured to about 3 to 12 m. The plate thickness is about 1.6 to 9.0 mm.

As the spring back function, the shape of the curved groove 3a is shown as a representative. However, the present invention is not limited to this, and the same function as that of the curved groove 3a (when wood is sandwiched by the spring back function) Any known method can be used as long as satisfactory pinching strength can be obtained. For example, the groove | channels, such as a triangle, trapezoid, semicircle, a semi-elliptical shape, and an arcuate shape, can be mentioned.

Subsequently, as shown in FIG. 3, the substantially light groove-shaped steel manufactured as described above is assembled into a substantially H shape, and the auxiliary material 9 is further assembled. First, the webs 1 of substantially light grooved steels arranged back to back are polymerized, and the position of the web 1, the presence or absence of a horizontal step of the flange 2, the contact status of the web 1a, etc. are confirmed. As shown in (c), caulking processing 5 is applied to a predetermined position of the polymerized web 1a to produce a substantially H-shaped shape steel firmly fixed. Next, the auxiliary material 9 is inserted between the lips 3. Examples of the fixing means include caulking, tightening with bolts and nuts, screwing, welding, and the like, but any known method may be used as long as a required strength is obtained. Further, the intervals for caulking and the like are arranged and processed in a well-balanced manner in consideration of the strength (allowable proof stress) per piece. The H-shaped steel can be manufactured to a web size of about 200 to 600 mm, a flange size of about 100 to 200 mm, and a length of about 3 to 12 m.

In addition, by placing the auxiliary material 9 above and below the flange 2 as described above, an effect can be obtained when it is desired to keep the beam (height) small due to design restrictions. For example, in the sectional secondary moment, the sectional area of the portion effective for the sectional secondary moment is increased by the distance from the neutral shaft to the upper (lower) flange and the lip is shortened. That is, by adding the auxiliary material 9 with the plate thickness adjusted to the extent that the vertical distance is reduced from the neutral axis, the cross-sectional area of the flange and the lip is increased to obtain an even cross-sectional performance.

As shown in FIG. 3, the wood 6 having both ends of the wood 6 slit in advance is inserted between the upper and lower curved grooves 3 a of the H-shaped steel. In this case, the width of the wood 6 is made slightly larger than between the curved grooves 3a. By inserting the wood 6 between the curved grooves 3a, the lips 3 on both sides are slightly opened, and the wood 6 is held by the effect of the spring back action of the lip 3. Subsequently, the nail 8 or the like is inserted into the nail hole 7, but since the warp of the wood 6 is held in advance by the convex surface of the curved groove 3a, the fluctuation of the wood 6 during the tightening operation of the nail 8 etc. This makes it possible to easily perform the installation work and improve the work efficiency. The fixing means includes nails, wood screws, glue ram rivets, draft pins, lug screws, bolts and nuts, etc., but any known method may be used as long as the required strength is obtained.

The above-mentioned slits for processing both ends of the wood 6 are mainly for braces in the axial force system (strut) construction method, and are slits through which the gusset plate penetrates. In the case of men, etc., a slit may be unnecessary.

As described above, the composite beam according to the present invention is a composite beam that can achieve both strength securing and utilization of small-diameter low-strength tree species such as thinned wood by utilizing the characteristics of different materials by combining different materials. is there. That is, the structural design of a wooden house or a large-scale building can be rationally performed because of its high cross-sectional performance, low cost, extremely practicality, and importance on earthquake resistance and durability. It can also promote the effective use of low-intensity tree species such as Japanese cedar, which has abundant domestic forest resources, and has an enormous effect on the construction industry and the environment related to CO2.

1 Web 1a Hat-type web
2 Flange 3 Lip 3a Curved groove 4 Bolt hole 5 Caulking 6 Wood 7 Nail hole 8 Nail
9 Auxiliary materials

Claims (4)

A strip-shaped steel plate is formed into a light groove-shaped steel shape along the longitudinal direction, has a plurality of bolt holes in the web at both ends of the longitudinal direction, and a plurality of bolt holes on the back side of the web other than the vicinity of the bolt holes of the web A light groove-shaped steel for a beam material having a protrusion, which is a substantially light groove shape having nail holes at predetermined intervals on a lip extending outward from the top and bottom flange ends of the light groove-shaped steel. In steel, a pair of the substantially light groove-shaped steel webs are superposed, the protrusions of the webs are integrated by caulking, the cross section is formed in a substantially H shape, and between the lips extending from the upper and lower flanges Further, the wood is fixed by a nail through a nail hole inserted into the lip and provided in the lip. The composite beam according to claim 1, wherein a long auxiliary material having a U-shape is inserted inside the substantially H-shaped lip. A strip-shaped steel plate is first formed into a light groove shape along the longitudinal direction, and a plurality of bolt holes are formed in the web at both ends of the longitudinal direction. A light grooved steel for a beam material having a protruding portion of the above, and a lip extending outwardly from the top end of the upper and lower flanges of the light grooved steel, is formed with a nail hole at a predetermined interval. In the grooved steel, a pair of the substantially light grooved steel webs are superposed, the protrusions of the webs are integrated by caulking, the cross section is formed in a substantially H shape, and then extends from the upper and lower flanges. A method for producing a composite beam, wherein wood is inserted between lips and the wood is fixed with nails from a nail hole provided in the lip. The method for manufacturing a composite beam according to claim 1, wherein a long steel plate bent into a U-shape is inserted inside the substantially H-shaped lip.

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