JP2005155027A - Floor support member and floor support structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economically advantageous floor support member and a floor support structure using the same, which uses a thin lightweight steel and compensates for a lack of strength while remaining easy to handle, which is good wood products.
[MEANS FOR SOLVING PROBLEMS] A core material having a substantially U-shaped cross section made of a thin steel plate, leaving both end sides or both end sides and a part between them on both side surfaces 3a, 3b or any one side surface of a core material 2 made of wood. The reinforcing structural steels 5a and 5b having a length shorter than 2 were attached.
Moreover, it replaced with said substantially U-shaped reinforcement shape steel 5a, 5b, and comprised the shape steel for reinforcement with the square steel which consists of a thin steel plate.
[Selection] Figure 1

Description

  The present invention relates to a floor support member for a low-rise building and a floor support structure using the same, and more particularly to a floor support member effective for a floor of a wooden house or the like and a floor support structure using the same. .

  Conventionally, as a supporting member for a floor of a wooden house or the like, a lumber cut out from wood and processed into a predetermined size is generally used regardless of the conventional shaft assembly method, the framed wall method, or other methods. . There are many variations of the floor support structure and support method using these wood products, especially in the conventional frame construction method for each housing manufacturer (for example, issued by Japan Housing and Wood Technology Center (former construction) Supervised by the Ministry of Housing Bureau, Wooden Housing Promotion Office) "Summary of the 9th Wooden House Rationalization Certification System" (October 1998)) is, in short, an important part of structural strength, that is, the weight of the roof, walls, etc. The strength of the large cross section at the part that supports the load such as snow and the part that supports the seismic load and wind load, for example, right under the outer wall of the floor, right under the wall of the room, and around the stairs. The part that supports only the load on the floor on the surface of the floor in between is used to support the floor using a wooden member with a smaller cross section. The former is commonly called a beam, a torso, etc., and the latter is commonly called a floor joist. The dimensions and shape of these materials should originally be able to be calculated by structural calculation according to the building conditions of each building, but in reality, as described in the above references, each housing manufacturer It is decided as a general solution in the system.

  In addition, these wooden members must be connected to each other in order to construct a floor structure to ensure the performance required for the floor, but lessons learned from the 1995 Hyogoken-Nanbu Earthquake At present, it is a general technique to be connected through metal fittings called many joint hardwares.

  However, since wood has low strength, especially bending rigidity, wooden floor support members have been used for members with very large dimensions in order to increase the cross-sectional performance of members when dealing with large spans (wide layout). Therefore, the cost of the member is increased, which is economically disadvantageous. In addition, since the member becomes large and the weight of the member itself becomes heavy, the workability is very poor, and the deflection due to its own weight often reduces the quality performance of the floor. From these problems, it has been practically difficult to realize a floor structure having a large span, specifically, a span exceeding 4 to 5 m, using a wooden floor support member.

  By the way, after the new construction, if there are significant defects such as tilt and deflection in the floor structure as the basic structure part of the house, according to the “Act on Promotion of Housing Quality Assurance” enforced in April 2000 For ten years, contractors have been obligated to take responsibility for warranty, and it has become increasingly difficult to ensure the quality of timber lumber products. Therefore, it is difficult to apply to a large span.

  As one of the methods for solving these problems, wooden members (also called engineering wood) such as structural laminated materials and structural veneer laminates (LVL) have been developed. Originally, these materials are products that have been devised and processed so that raw materials that could not be used for structural purposes can be used. Here, in order to cover the quality of raw materials, it is a product that gathers thin materials and integrates them using adhesives, but it is impossible to completely hide the quality of the materials, in addition to lack of strength, dryness The actual situation is that it is far from a complete solution because it suffers from deterioration in quality due to the shrinkage of the tree, high cost, poor distribution and other problems.

Furthermore, in recent years, a thin steel plate that can be used as a building material is formed into a substantially U-shape by bending, and a substantially C-shape having a lip portion formed by bending the front ends of the flanges toward each other. A steel truss joint structure in which a shaped steel member is configured and a wooden material is fitted in the shaped steel member has been proposed (for example, see Patent Document 1).
JP 2001-329654 A

  The joint structure of the steel truss of Patent Document 1 is intended for a roof frame of a building, and is not assumed to be used as a floor support member, and when this is used as a floor support member, In addition to being heavy and inconvenient for construction, it is difficult to join with surrounding wooden floor support members.

  The present invention has been made to solve the above-mentioned problems. In recent years, it has been possible to use a thin lightweight steel that can be used as a building material in recent years, while remaining easy to handle, which is a good wood product. An object of the present invention is to provide a floor support member that compensates for a lack of strength and is economically advantageous, and a floor support structure using the same.

  The floor support member according to the present invention is made of a thin steel plate and has a substantially U-shaped cross section, leaving both end sides or both end sides and a part between them on both sides or any one side of a core made of wood. A reinforcing structural steel having a length shorter than the length of the core is attached.

  Moreover, it replaced with said substantially U-shaped reinforcement shape steel, and comprised the shape steel for reinforcement with the hollow square steel which consists of a thin steel plate.

  The upper or lower surface or any one surface of the reinforcing structural steel was positioned substantially on the same plane as the upper or lower surface or any one surface of the core material.

  The floor support structure according to the present invention is obtained by joining the end of the floor support member to a surrounding wooden floor support member or a floor support member.

The present invention is a composite member in which a steel member having a high bending stiffness is joined and integrated with the wooden member while retaining the features of a wooden member that is easy to use as a floor support member, and the bending stiffness, which is a weak point of wood, is reinforced. Needless to say, improvement in strength performance, it has become possible to provide a floor support structure for a large span floor, which has been difficult in the past, without increasing costs and reducing workability.
Further, according to the floor support member of the present invention, it is possible to suppress the deflection and deformation of the floor over a long period of time, and it is possible to obtain an effect of ensuring remarkable quality and performance improvement while ensuring the quality of the house.

  The floor support member according to the present invention has a lip groove made of a thin steel plate having a length shorter than the length of the wooden core material on either side surface or any one side surface of the core material made of wood (hereinafter referred to as a wooden core material). Shaped steel, grooved steel or hollow square steel is joined in an arrangement that does not cover both ends of the wooden core. This is a portion related to the basis of the present invention, by joining a lip grooved steel or a grooved steel or a square steel made of a thin steel plate having a higher bending rigidity than wood to the side of the wooden core material for a long time. The structure can improve the stability and strength (bending rigidity) of the dimension and shape, can be easily joined to other wooden floor support members, and does not adversely affect the floor base.

  The inventors first studied the required performance required for the floor support member and the characteristics of the wood used. As a result, the inventors strengthened the bending rigidity, which is a weak point of wood, and improved the performance as a floor support member. In order to achieve this, it is necessary to reinforce the strength against bending as a composite member with other materials with high bending rigidity (strength against bending). Furthermore, this reinforcing material has a high Young's modulus and is lightweight. We thought that the desired performance could be achieved by using thin steel plates that are easy to use, easy to obtain and economical.

The standard elastic modulus of wood lumber, for example, vegetation (Class 1 grade 1), is 1200KN / cm ² (Reference: “Wood structure design criteria, same explanation, one permissible stress and permissible strength design method-”) The Young's modulus of the steel sheet (steel) is 20,600 KN / cm ² (reference: “New steel for construction”, Steel Structure Publishing, 1998, p45). Therefore, it was considered that the purpose could be sufficiently achieved by using a member having a stiffening effect by a steel material. In addition, according to the Ministry of Land, Infrastructure, Transport and Tourism Notification No. 1641 promulgated in November 2001, “Defining Technical Standards Required for the Structure of Thin Lightweight Steel Structures or Structural Methods of Buildings” In response to the legal recognition of a structural steel made of thin steel sheets that is optimal for achieving this purpose (grooved steel with a lip, grooved steel, or square steel), The present invention has been proposed.
The inventors have also studied the floor support structure, that is, the assembly and joining of the floor support members, and maintained the workability and economy without complicating the connection with the wooden floor support members. They proposed the shape and configuration of the floor support members that can be made.

  The wood core material used here does not specifically specify the tree species (materials), but other wood species as well as the lumber of wood (matsu, hinoki, tsutsuga, tsugi, etc.) conventionally used for construction. There is no problem in achieving the object of the present invention even if a laminated material containing slag (including a single-plate laminated material, so-called LVL) is used. If it dares to say, it is the floor support member of the present invention that can solve practical problems even with low quality wood.

  Next, the material of the lip groove steel, groove steel or square steel made of thin steel plate (strength of steel plate, type of surface treatment, etc.) applied to increase the strength (flexural rigidity) of the floor support member according to the present invention. ) And dimensional shape (cross-sectional shape, web height, flange width, lip length, plate thickness, etc.) are important points, but in practice there is no need to specify them in order to achieve the purpose. What is considered necessary for achieving and satisfying the desired strength performance of the member may be examined in advance and selected for use. For example, “Surface treatment thin plate lightweight steel for building structure” in the Japan Iron and Steel Federation product regulations is one of the preferred materials that can be used without problems, but here, a material with a strength of 400 Mpa is applied, Surface treatment includes surface treatment materials such as hot dip galvanizing, hot dip zinc-5% aluminum plating, 55% aluminum galvanizing.

  However, it is not necessary to limit to this, and there is no problem even if a material such as light steel for general structure (JIS G3350) which has been conventionally JIS is used. Further, the dimension and shape are not particularly specified or limited, and as described above, a shape that can obtain the necessary cross-sectional performance may be selected and applied from the viewpoint of cost, availability, and other conveniences. In order to increase the reinforcement effect, the shape steel with a larger cross-sectional performance is better. However, if the shape steel with a larger cross section than that of the wooden core is used, other members can be used when forming the floor. Since the problem arises in connection with the connection, and the weight is increased and the problem also arises in the construction, it is practically difficult to apply the shape steel having a larger cross-sectional dimension than the wooden core material. In addition, the above-mentioned Japan Iron and Steel Federation product regulations stipulate a wide range of dimensions and shapes, which are useful as reference materials for selection.

  In addition, various techniques can be applied to the means for joining thin steel plate lip groove steel, groove steel or square steel and wooden core material as strength reinforcing steel. In view of quality stability, at present, the use of screws, nails, bolts and the like is surely and appropriate. In addition to screws, nails, bolts, etc., it is possible to apply techniques such as bonding to join thin steel sheets and wooden cores, but from the standpoint of ensuring performance over a long period of time, what is a sufficient alternative technique? I can not say.

  Furthermore, as an important component, the length of the lip groove steel, groove steel or square steel made of thin steel sheet is made shorter than the length of the wooden core, and both ends of the wooden core at the time of joining must be It is necessary to make it a stripped shape (joint part). This is because by adopting such a shape, the floor support member of the present invention has a shape that is not different from the wooden floor support member that has been used at both ends, and can be easily joined to other wooden support members. Therefore, the effectiveness of the floor support member according to the present invention can be further enhanced.

Moreover, the floor support structure according to the present invention is a construction method in which the floor support member is connected to a surrounding wooden floor support member or the floor support members are connected to each other. Compared to a simple construction, it is possible to economically construct a lightweight and strong floor.
Here, as a joining means when connecting the floor support member of the present invention to the surrounding wooden floor support member, in light of the object of the present invention, the mutual wood parts are directly connected without using the joint hardware. For example, a simple method of making a joint by engraving or the like and fastening it by nail fastening or the like is possible, and it is also possible to fasten it via a joint hardware. Of course, screws or bolts if possible can be used instead of nails. Similarly, in the portion of the present invention that connects the floor support members, the purpose is to join the wood supports of the floor support members according to the prior art in exactly the same manner as described above. Can be reached.
Embodiments of the present invention will be described below.

[Embodiment 1]
1 is a perspective view of a floor support member according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is an exploded perspective view of FIG.
In the figure, reference numeral 1 denotes a floor support member according to the present embodiment, which is fixed to both side surfaces of a wooden core 2 made of ordinary lumber lumber and a thin steel plate as a reinforcing structural steel. The pair of lip groove steels 5a and 5b having the same shape (hereinafter may be simply referred to as 5).

The wooden core 2 is a commonly used wood product having a length L ₁ , a component h ₁ , and a width W _{1 and} a rectangular cross section, and has not been subjected to any processing for carrying out the present invention.
Lip groove-shaped steel 5a is shaped steel reinforcing, 5b, the length L ₂ is shorter than the length L ₁ of the wooden core 2, formed of wooden heartwood 2 (blame) h ₁ and the same web height h _2, is formed in a substantially U-shape of the flange portion 7a, 7b are provided the width W ₂ having a lip 8a, 8b are vertically.

In the floor supporting member 1 as described above, lip groove-shaped steel 5a wooden core 2, to attach the 5b, leaving both end portions of the wooden core 2 by substantially the same length L ₃ (hereinafter, bonding this part Between the joint portions 4a and 4b) and one of the side surfaces (for example, 3a) of the wooden core 2, the upper surface of the upper flange 7a is substantially flush with the upper surface of the wooden core 2 (hereinafter referred to as a surface). The web 6 of the lip groove steel 5a is brought into contact with the opening being outside and fastened with a plurality of screws 20 and fixed. Similarly, the web 6 of the lip groove steel 5 a is brought into contact with the other side surface 3 b of the wooden core 2 and fixed with a plurality of screws 20.

The screw 20 used here is not particularly limited. However, the drilling tapping screw (JIS B 1059-2001) described in the notice regarding the thin plate lightweight steel structure and the Japan Iron and Steel Federation product regulations It is desirable to use a “steel house drill screw” that can be checked for quality. Regarding the fastening interval and the number of screws 20, for example, in the case of “steel house drill screw” in the above-mentioned provisions of the Japan Iron and Steel Federation, the shear strength (proof strength) of the screw has been clarified beforehand. An interval that can secure the required strength on the member structure is determined by calculation, and the distance may be fixed as it is. In the present embodiment, an example in which the screws 20 are fastened in two rows is shown, but this may also be one row or three rows if there is no structural problem by structural calculation (the following embodiments) The same applies to the above).
Further, the lip groove steel 5 has a length shorter than that of the wooden core material 2, and the joint portions 4a and 4b in which the wooden core material 2 is exposed are formed on both ends of the wooden core material 2. , the length L ₃ of 4b may be suitably determined within the range that can be bonded to the wood of the other members, not particularly defined.

Since the floor support member 1 according to the present embodiment is a composite member in which the wooden core material 2 and the lip groove steel 5 are integrally coupled as described above, the bending rigidity of the member as compared with the case of the wooden support member alone. Can be greatly increased. For this reason, a member applicable to a floor support structure with a large span could be realized with a minimum increase in weight and cost.
Further, since the upper and lower surfaces of the wooden core 2 and the upper and lower surfaces of the flange portions 7a and 7b of the lip groove steel 5a and 5b are substantially flush with each other, they are stuck on the floor support member 1. The floor base material to be attached (in some cases, the ceiling base material attached to the lower surface of the floor support member 1) does not cause a problem of unevenness.

FIG. 4 is a perspective view of another example of the floor support member according to the present embodiment and a cross-sectional view thereof taken along the line BB.
In this example, in place of the lip groove steels 5a and 5b in the example of FIG. 1, groove steels 10a and 10b (hereinafter simply referred to as 10) having a U-shaped cross section are used. Is the same as in the example of FIG.

FIG. 5 is a perspective view of still another example of the floor support member according to the present embodiment and a CC cross-sectional view thereof.
In this example, a hollow square steel 15 having a height substantially equal to that of the wooden core material 2 is attached to one side surface (for example, 3a) of the wooden core material 2 as a reinforcing structural steel, and the other side surface 3b is attached to the other side surface 3b. The lip groove steel 5 (or the groove steel 10) is attached, and other configurations are the same as those in FIG. In addition, since the square steel 15 is a closed cross section, it is difficult to fasten from the inside when joining to the wooden core 2. Therefore, the bolts or screws 21 having a length penetrating the wooden core material 2 are fastened from the other side surface 3b side through the lip groove steel 5 and fixed.
In the examples of FIGS. 4 and 5 as well, substantially the same effect as in the case of FIG. 1 can be obtained.

[Embodiment 2]
FIG. 6 is a perspective view of a floor support member according to Embodiment 2 of the present invention and a DD sectional view thereof.
In the first embodiment, the floor support member 1 is configured by joining the lip groove steel 5 or the groove steel 10 or the square steel 15 which is a reinforcing steel shape to both side surfaces 3a and 3b of the wooden core 2. As shown, in the present embodiment, these reinforcing steel shapes are joined only to one side surface of the wooden core material 2.
In this example, the web 6 of the lip groove steel 5 is brought into contact with one side surface (for example, 3 a) of the wooden core 2, leaving the joint portions 4 a and 4 b at both end sides, and is fastened by a plurality of nails 22. The other configurations are almost the same as those in the first embodiment.

FIG. 7 is a perspective view of another example of the floor support member according to the present embodiment and its EE sectional view, and FIG. 8 is a perspective view of still another example of the present embodiment and its EE sectional view. is there.
In the example of FIG. 7, a structural laminated material is used for the wooden core material 2 instead of the lumber lumber, and the web 6 of the lip groove steel 5 is applied to one side surface (the case shown in FIG. 3b). The other structure is the same as that shown in FIG.
Further, the example of FIG. 8 uses a structural single plate laminated material as the wooden core material 2, and the other configuration is the same as that of FIG.

  The nail 22 used here is not particularly limited, but as an example of a screw nail described in the notice regarding the thin and light steel structure, the “screw nail for steel house” in the Japan Iron and Steel Federation product regulations. It is desirable to use the one that can confirm the quality such as “”. The fastening interval and the number of nails 22 may be handled in the same manner as in the case of the screw 20. In the present embodiment, the screw 20 may be used in the same manner as in the first embodiment instead of the nail 22. .

  According to the present embodiment, the strength (bending rigidity) is slightly lower than that of the floor support member of the first embodiment, but a sufficient performance improvement effect can be obtained. The structural laminated material constituting the wooden core material 2 in FIG. 7 or the structural veneer laminate in FIG. 8 can also be used as the wooden core material 2 in the first embodiment, and is also described in the following third embodiment. It can also be used as the wooden core 2 of ˜5.

[Embodiment 3]
FIG. 9 is a perspective view of a floor support member according to Embodiment 3 of the present invention.
In the present embodiment, a plurality of pairs of lip groove steels 5a, 5b, 5c, which are shorter than the lip groove steel 5 of the first embodiment (two pairs are shown in the figure). The floor support member 1 is configured by using 5d and joining the lip groove shapes 5a, 5b and 5c, 5d with the respective pairs of the wooden core materials 2 between them.

  That is, a pair of lip groove steels 5a and 5b are joined to both side surfaces of the wooden core 2 with screws 20 or the like, leaving the joint 4a on one end side, and a predetermined amount of the lip groove steels 5a and 5b is fixed. A pair of other lip groove steels 5c and 5d are joined to both side surfaces of the wooden core member 2 with a space left and the joint portion 4b remaining on the other end portion side. The joint portions 4a and 4b are provided, and a third joint portion 4c is configured between the lip groove steels 5a and 5b and 5c and 5d. In addition, although the figure showed the case where the lip channel steel 5 of the same length was used for each pair, and the 3rd junction part 4c was provided in the intermediate part of the longitudinal direction of the wooden core 2, it is limited to this Instead, the third joint 4c may be provided at a desired position by appropriately changing the length of the lip groove steel 5 depending on each pair.

In the above description, a case where a plurality of lip groove steels 5 having a short length are joined to both side surfaces of the wooden core 2 and the third joint 4c is provided between them is shown. A lip groove steel 5 having a short length is joined to one side surface (for example, 3a) of 2 at a predetermined interval, and a long length (for example, L ₂ in FIG. 3) is joined to the other side surface 3b. The lip groove steel 5 may be joined, and the third joint 4c may be provided only on one side surface 3a of the wooden core 2 (see FIG. 15).
In the above description, the case where the lip groove steel 5 is used as the reinforcing steel material is shown. However, the groove steel 10 or the square steel 15 may be used. You may join only to one side of 2. Further, the web height of the reinforcing structural steel, the mounting position on the wooden core 2 and the mounting means may be as described in the fourth and fifth embodiments described later.

  Since the floor support member 1 according to the present embodiment is further provided with the third joint 4c between the joints 4a and 4b on both ends, the floor support member 1 is a wooden floor support member having a floor support structure. Is replaced with the third joint portion 4c by joining the joint portion (4a or 4b) of the floor support member 1 according to the first and second embodiments or the fourth and fifth embodiments described later. Thus, a stronger floor support structure can be obtained.

[Embodiment 4]
FIG. 10 is a schematic cross-sectional view of a floor support member according to Embodiment 4 of the present invention.
In the first to third embodiments, the lip groove steel 5, the groove steel 10 or the square steel 15, which is a reinforcing steel having the same web height as that of the wooden core 2, is attached to both side surfaces of the wooden core 2. Alternatively, the case where the floor support member 1 is configured by joining the upper and lower surfaces of the one side to the upper and lower surfaces of the wooden core 2 to form the floor support member 1 is described. Only one of the upper and lower surfaces of the lip groove steel 5 or the like, which is a shape steel, is flush with the upper or lower surface of the wooden core 2.

FIG. 10A shows a pair of lip groove steels 5a and 5b whose web height is lower (shorter) than that of the wooden core 2 and the upper surface of the upper flange 7a faces the upper surface of the wooden core 2. The web 6 is joined to both side surfaces of the wooden core 2 with screws 20 or the like.
FIG. 10B shows a pair of lip groove steels 5a and 5b that are similarly joined to both side surfaces of the lower flange 7b so that the lower surface of the lower flange 7b is flush with the lower surface of the wooden core 2. It is a thing.

  Further, FIG. 10 (c) shows that one lip groove steel (for example, 5a) has the same web height as that of the wooden core 2 and the other lip groove steel 5b. Use a web whose web height is lower than that of the wooden core 2 and make the upper surfaces of the upper flanges 7a of the lip groove steels 5a, 5b flush with the upper surface of the wooden core 2. The wooden core 2 is joined to both side surfaces by screws 20 or the like. In this case, you may join so that the lower surface of the lower flange 7b of both the lip channel steel 5a, 5b may be flush with the lower surface of the wooden core 2.

In the above description, the lip groove steel 5a having a web height equal to that of the wooden core 2 and / or the lip groove steel having a lower web height than that of the wooden core 2 is formed on both sides of the wooden core 2. Although the case where 5b was joined was shown, the lip groove steel 5 may be attached only to one side of the wooden core 2. Similarly, instead of the lip groove steel 5a and 5b, the groove steel 10 Or you may join the square steel 15 or these combining suitably.
Also in the present embodiment, the strength (bending rigidity) of the floor support member 1 is improved, and a sufficient improvement effect is obtained. Therefore, the floor support member 1 can be appropriately employed in consideration of workability and economic efficiency.

[Embodiment 5]
FIG. 11 is a schematic cross-sectional view of a floor support member according to Embodiment 5 of the present invention, and FIG. 12 is a schematic cross-sectional view of another example of the floor support member according to Embodiment 5 of the present invention.
In the present embodiment, the hollow square steel 15 described in the second embodiment is basically joined to both side surfaces of the wooden core material 2, but the ready-made (factory product) square steel 15 is Since it is a closed cross section, it cannot be fastened to the wooden core 2 with screws 20 or the like from the inside. Therefore, in the present embodiment, substantially the same performance and effects as those obtained when the square steel 15 is joined to the wooden core 2 by other means are obtained.

  In the example of FIG. 11, first, the web 6 of the lip groove shape steel 5a, 5b whose web height is lower than that of the wooden core 2 is joined to both side surfaces of the wooden core 2 with screws 20 or the like. On the outside of the section steels 5a and 5b, grooved steels 10a and 10b whose inner height of the web 6 is almost equal to the web height of the lip groove shaped steels 5a and 5b are fitted with the opening portions on the inside, and the flange portions thereof 12a and 12b are superposed on top and bottom of the flange portions 7a and 7b of the lip groove steel 5a and 5b, and both flange portions 7a and 12a, 7b and 12b are fixed with screws 20 or the like, and integrated.

In the example of FIG. 12A, groove steels 10a and 10b are joined to both sides of the wooden core 2 by screws 20 or the like instead of the lip groove steels 5a and 5b of FIG. 10c and 10d are fitted, and both flange portions 12a, 12a, 12b, and 12b are fixed by screws 20 or the like and integrated.
In the example of FIG. 12 (b), the square steel 15 is brought into contact with one side surface of the wooden core 2, and the lip groove steel 5 (or the groove steel 10) is brought into contact with the other side surface. It is fixed to the wooden core 2 with a long screw, bolt 21 or the like. Next, the grooved steel 10 is fitted from the outside of the lip grooved steel 5, and both flange portions 7a and 12a, 7b and 12b are fixed with screws 20 or the like, and integrated.

  In the above description, the lip groove steel 5, the groove steel 10 or the square steel 15 having a web height lower than that of the wooden core material 2 is used, and the both sides of the wooden core material 2 are substantially in the middle in the vertical direction. Although the case where these were joined was shown, the web height of the grooved steel 10 provided on the outer side is substantially equal to the formation of the wooden core, and accordingly, the inner lip grooved steel 5 or the grooved steel 10 You may increase the web height. Further, the upper surface of the upper flange 12a or the lower flange 12b of the grooved steel 10 provided on the outside is arranged by placing the lip grooved steel 5 or the grooved steel 10 provided on the inner side above or below the side surface of the wooden core material 2. Or you may attach so that the lower surface or the upper surface or lower surface of the square steel 15 may be flush with the upper surface or lower surface of the wooden core 2. Further, as the lip groove steel 5, the groove steel 10, or the square steel 15, as shown in FIG. 10 (c) of the fourth embodiment, those having different web heights on the left and right sides of the wooden core material 2 may be used. Good. These reinforcing steel shapes may be joined only to one side surface of the wooden core 2.

  In the present embodiment, the lip groove steel 5 or the groove steel 10 fixed to both side surfaces of the wooden core 2 and the groove steel 10 fitted to the outside thereof are firmly fixed and integrated. Thus, the same cross-sectional performance as when the square steel pipe 15 is attached to the side surface of the wooden core 2, that is, the strength can be secured, so that it can be applied to a floor support structure with a large span. .

Next, an embodiment of the floor support member according to the present invention will be described with reference to FIG. The present example is intended for the floor support member according to the first embodiment.
As the wooden core material 2, a material made of rice husk material having a length L ₁ : 4.55 m, a composition h ₁ : 23.5 cm, and a width W ₁ : 4 cm was used.
The lip groove shape steel 5 which is a reinforcing shape steel is obtained by bending a thin steel plate having a thickness t: 1.6 mm, a length L ₂ : 4.25 m, and a web height h ₂ : 23.5 cm. A flange width W _{2 of} 4 cm was used.

In joining the lip groove steel 5 as described above to the wooden core material 2, first, the upper surface of the upper flange portion 7 a is flush with the upper surface of the wooden core material 2 on one side surface of the wooden core material 2. In addition, the web 6 of the lip groove steel 5a is brought into contact with the joints 4a and 4b at both ends, and the thread length is 2 cm and the thread outer diameter is 4 in the upper and lower rows at intervals of 30 cm or less in the longitudinal direction. An 8 mm drilling tapping screw 20 was screwed into the wooden core 2 from the web 6 and fixed. Similarly, the floor support member 1 was configured by fixing the lip groove steel 5b to the other side surface of the wooden core 2.
As a result, the floor support member 1 having a strength (flexural rigidity) about 3.5 times that of the conventional wooden floor support member made of substantially the same material as the wooden core material 2 could be obtained.
The above-described embodiment shows an example, and it is needless to say that materials, dimensions of each part, and the like can be appropriately changed.

[Embodiment 6]
Next, an example of a floor support structure using the floor support member 1 according to the present invention will be described.
FIG. 13 shows the floor support member 1 according to the present invention (in the figure, the floor support member 1 according to the first embodiment is shown but is not limited thereto) to the surrounding wooden floor support member 30. The state joined via the joint metal fitting 35 is shown.
The floor support member 1 is orthogonal to the wooden floor support member 30, and the upper surface (the upper surface of the joint 4a and the flange portion 7a of the lip groove steel 5a, 5b) is flush with the upper surface of the wooden floor support member 30 ( The end portion (joint portion 4a) is in contact with the side surface of the wooden floor support member 30, and is fixed by screws, nails, etc. 36 by means of a metal fitting 35, and both are joined together. To do. Here, the joint hardware 35 can be an angle-shaped hardware, a stool-shaped hardware, or the like.

  A structural plywood 32 or a similar base material is affixed to the upper surface of the floor support structure thus configured as a floor base. Thereby, since the joining portions 4a and 4b are provided at the end portion of the floor support member 1, joining to the wooden support member 30 is very easy. Further, since the floor support member 1 is reinforced with the reinforcing structural steel, the floor support member 1 is structurally stable without being bent or bent over a long period of time, and the top surfaces of the wooden floor support member 30 and the floor support member 1. Since it is flush, a floor support structure that does not cause problems such as uneven floors can be obtained.

  FIG. 14 shows another example of the floor support structure. In this example, the end portion of the floor support member 1 (the floor support member 1 according to the fourth embodiment is shown in the figure, but is not limited to this) by carving on the wooden floor support member 30. A joint portion 31 corresponding to the shape of the joint portion 4a is provided, the joint portion 4a of the floor support member 1 is inserted into the joint portion 31, and screws, nails 36, etc. are obliquely fastened and joined. It is.

  FIG. 15 shows still another example of the floor support structure. In this example, the floor support member 1 according to the third embodiment is used in place of the wooden floor support member 30, and the third joint portion 4c is used. The end portion of the floor support member 1 is fitted to the side surface via the joint metal fitting 35. According to this example, the strength (rigidity) of the floor support structure can be further increased.

  In the above description, the case where the floor support member according to the present invention is used in a floor support structure has been shown, but the present invention can also be applied to a ceiling base structure.

It is a perspective view of the floor support member concerning Embodiment 1 of the present invention. It is AA sectional drawing of FIG. FIG. 2 is an exploded perspective view of FIG. 1. It is the perspective view of the other example of Embodiment 1 of this invention, and its BB sectional drawing. It is the perspective view of other example of Embodiment 1, and its CC sectional drawing. It is the perspective view of the floor support member which concerns on Embodiment 2 of this invention, and its DD sectional drawing. It is the perspective view of the other example of Embodiment 2, and its EE sectional drawing. It is the perspective view of the further another example of Embodiment 2, and its FF sectional drawing. It is a perspective view of the floor support member concerning Embodiment 3 of the present invention. It is a typical sectional view of the floor support member concerning Embodiment 4 of the present invention. It is a typical sectional view of the floor support member concerning Embodiment 5 of the present invention. FIG. 10 is a schematic cross-sectional view of another example of the fifth embodiment. It is explanatory drawing of an example of the floor support structure which concerns on Embodiment 6 of this invention. It is explanatory drawing of the other example of a floor support structure. It is explanatory drawing of the further another example of a floor support structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor support member, 2 Wooden core material, 4a-4c Joint part, 5 Lip groove steel, 7a, 7b, 12a, 12b Flange part, 10 Channel steel, 15 Square steel, 20 Screw, 22 Nail, 30 Wooden support member 35 Joint hardware.

Claims (4)

  On both sides or either side of the core made of wood, both ends or both ends and a part in between are left, and the length is shorter than the length of the core made of a thin steel plate with a substantially U-shaped cross section. A floor supporting member, characterized in that a shape steel for reinforcement is attached.   2. The floor support member according to claim 1, wherein the reinforcing structural steel is constituted by a hollow square steel made of a thin steel plate instead of the substantially U-shaped reinforcing steel.   The floor support according to claim 1 or 2, wherein the upper and lower surfaces or any one surface of the reinforcing structural steel is positioned substantially on the same plane as the upper and lower surfaces or any one surface of the core material. Element. The floor support structure characterized by joining the edge part of the floor support member which concerns on any one of Claims 1-3 to the surrounding wooden floor support member or a floor support member.

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