JP2005048471A - Wood-steel composite structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of sufficiently securing safety when a fire occurs even in a wooden building. <P>SOLUTION: This wood-steel composite structure has a main frame 3 having ultimate yield strength capable of preventing at least collapse; and adopts a composite column formed of a column body composed of wood capable of supporting a long-term vertical load, and a suspending material 7 composed of a steel material for inserting its core part in the vertical direction, as a column 4 of the respective floors arranged separately from the main frame. The columns of the respective floors are continuously arranged in the vertical direction, and the uppermost part of a series of suspending materials in a series of these columns is connected to the main frame, and the ultimate vertical load can be suspended and supported by the main frame via the suspending materials. A connection member is interposed between the columns of the respective floors, and the mutual suspending materials of the respective floors are connected via the connection member. A thermally insulating material for thermally insulating these member and material, is interposed in a connecting part of the connection member and the suspending materials. The connection member is covered with a fire resistant material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a building, and more particularly, to a steel and steel composite structure in which wood and steel are mixed as structural materials.

  As is well known, wooden structures are subject to various regulations to ensure safety in the event of a fire because the structure itself is made of flammable materials. It has been considered unrealistic to use large-scale medium- and high-rise buildings as wooden structures, and the use of timber as a main structural member in large-scale buildings is various. It was difficult.

Therefore, composite materials combining wood and steel materials or concrete materials have also been developed. For example, Patent Document 1 proposes a composite material in which a concrete material is used as a base material and wood is laminated as a decorative material on the surface. Has been.
JP-A-5-331959

  The composite material as shown in Patent Document 1 looks like wood, and if it is used as a structural material, an appearance as if it is a wooden building can be obtained. Is not a wooden structure in terms of structure, and it does not fully utilize the various advantages and characteristics inherent in wooden structures.

  Although the present invention is basically wooden, it is possible to sufficiently secure safety in the event of a fire, and thus to provide an effective structure capable of realizing a large-scale medium- and high-rise wooden building. The purpose is that.

  The invention of claim 1 is a wood-steel composite structure in which wood and steel are mixed as a structural material of a building, and has a main frame having at least ultimate strength capable of preventing collapse, and separately from the main frame As the pillars on each floor, a composite pillar consisting of a pillar body made of wood that can support a long-term vertical load and a suspension material made of steel that penetrates the core in the vertical direction is adopted, and the pillars on each floor are made vertically It is characterized in that the vertical load at the end can be suspended and supported by the main frame via the suspension material by connecting the uppermost part of the suspension material in the series of columns to the main frame. To do.

  The invention of claim 2 is the wood-steel composite structure of the invention of claim 1, wherein a joint member is interposed between the pillars of each floor continuously arranged in the vertical direction, and the suspension members of each floor are jointed. It is characterized by being connected via a member.

  The invention of claim 3 is the wood-steel composite structure of the invention of claim 2, characterized in that a heat insulating material that thermally insulates them is interposed at a connection portion between the joint member and the suspension member. .

  The invention of claim 4 is the wood-steel composite structure of the invention of claim 2 or 3, characterized in that the joint member is covered with a refractory material.

  According to the first aspect of the present invention, a composite column in which a suspension material made of steel is incorporated in the core of a column main body made of wood is adopted, and the column main body of the column is not only the appearance but also the wooden column structurally as it is. As a series of suspension materials made of steel material inserted into the core part are supported so that they can be suspended and supported by the main frame, the main body of the pillar can be used at any floor in the event of a fire. Even if the damage to the vertical load is lost due to the disaster, the vertical load on the upper floor is supported by the main frame through the suspension material, so that at least the whole building collapses can be prevented. And fire safety can be ensured.

  According to the invention of claim 2, since the pillars of each floor are connected in the vertical direction via the joint member and the suspension members of each floor are connected via the joint member, the pillars of each floor are sequentially connected and stacked. The construction can be done easily by following it, and after a fire it can be easily restored by repairing or replacing only the pillars of the damaged floor.

  According to invention of Claim 3, since the heat insulating material was interposed in the connection part of a joint member and a suspension material, the fire spread to other floors via a suspension material and a joint member can be prevented. .

  According to invention of Claim 4, since the joint member was coat | covered with the refractory material, damage to the joint member at the time of a fire and the spread of fire to other floors through the joint member can be prevented.

  One embodiment when the present invention is applied to, for example, a building having 10 stories above the ground is shown in FIGS. As shown in FIG. 1, the building in the present embodiment has a large-scale main frame 3 including a core wall 1 (shown by a chain line) extending over the entire height and a hat truss 2 laid between the tops thereof. In the lower space of the hat truss 2, pillars 4 and floors 5 of each floor (the floor 5 includes a beam 12 as will be described later), and the structures of the pillars 4 and the floor 5 are basically wooden. It is a thing.

  The main frame 3 has a sufficient fire resistance, and even if a fire occurs in the building and the pillar 4 inside the building loses its strength, at least the whole building can be prevented from collapsing. Designed to have ultimate strength. The structure of the core wall 1 is realistically made of reinforced concrete, and the structure of the hat truss 2 is realistically made of steel frame by a steel pipe or the like, or when desired rigidity and fire resistance can be ensured In addition, the core wall 1 and the hat truss 2 can also be made of a wooden structure or a similar structure.

  As shown in FIG. 2, a composite pillar made up of a pillar body 6 made of wood and a suspension member 7 made of steel with its core portion inserted vertically is adopted as the pillar 4 on each floor. The column 4 is continuously provided in the vertical direction via the joint member 8. The column body 6 in this example is made of wood having a circular cross section, and is itself designed to function structurally as a wooden column and support a long-term vertical load. As the suspension member 7, a PC steel rod or a PC steel stranded wire can be suitably used, and the upper end portion and the lower end portion of the suspension member 7 on each floor are respectively connected to the above-mentioned joint member 8 so as to be finished. A series of parts from the lowermost floor to the uppermost floor is provided via the mouth member 8, and the uppermost end of the series of suspension members 7 is connected to the hat truss 2.

  The joint member 8 is made of a steel material, and a plate body 10 made of a circular steel plate is welded to the upper and lower sides of a short tube member 9 made of a thick-walled steel pipe, respectively, and the end portion of the suspension member 7 is each plate body 10. The nut member 11 is screwed into the center hole and fixed to the joint member 8. The short pipe member 9 is provided with an opening for tightening the nut member 11.

  The joint member 8 is provided with a joining plate 13 for joining the beam 12 around the joint member 8. The joint member 8 is arranged in the joint portion and the columns 4 are joined to the upper and lower sides thereof, and The beam 12 is joined to the periphery via a joining plate 13, and a floor material 15 and a ceiling material 16 are attached to the upper and lower sides of the beam 12 via a base plate 14, respectively. The floor 5 in which the beam 12 is built is formed. In this example, wood is used as the beam 12 and the base plate 14, and a panel having a fire-resistant performance such as diatomaceous earth is used as the flooring 15 and the ceiling 16 so that the structure of the floor 5 is as follows. Although it is basically made of wood, the floor 5 has sufficient fire resistance by providing a floor material 15 and a ceiling material 16 having fire resistance performance above and below the beam 12, respectively. It can be formed.

  In addition, a refractory material 17 made of a concrete plate or the like is interposed between the joint member 8 and the column 4 to prevent the joint member 8 from being directly exposed to a high temperature in the event of a fire. It has come to be. Further, a heat insulating material 18 is interposed between the connecting point of the suspension member 7 and the joint member 8, that is, between the plate body 10 and the nut member 11, and they are thermally insulated so that the heat conduction is cut off. ing.

  According to the above structure, the column body 6 in the column 4 functions as a wooden column not only in appearance but also in structure, so that a long-term vertical load is directly applied to the column body 6 as in the case of a normal wooden building. Can be made. Further, according to the above structure, in the event that the column main body 6 is damaged in an arbitrary floor due to the occurrence of a fire and loses proof strength against the vertical load, the vertical load on the upper floor is higher than the suspension material 7. Therefore, it is possible to prevent a situation in which at least the entire building collapses and to ensure fire safety.

  In other words, in the case of a conventional simple wooden building, if a wooden pillar is damaged by a fire, the vertical load on the upper floor cannot be supported and the entire building collapses early. However, according to the structure of the present embodiment, even if the column main body 6 is damaged and loses its proof strength, the upper floor vertical load is suspended by the main frame 3 via the suspension material 7. Since it is supported, at least the building can be prevented from collapsing. For example, as shown in FIG. 1B, even if a fire occurs on the fourth floor and the column main body 6 on that floor burns out, the vertical load on the fourth floor or higher is hatted via the suspension material 7 as indicated by the arrow. Since the truss 2 and the core wall 1 are stably supported as they are, they do not collapse. Of course, even if the hat truss 2 is damaged and its proof strength is lost, there is no concern of collapse if the pillars 4 on each floor are healthy.

  That is, the structure of the present embodiment normally functions in the same way as a conventional wooden building, but automatically switches to a kind of suspension structure by the main frame 3 and the suspension material 7 in the event of a fire. Although it is basically a wooden structure, it can naturally ensure sufficient fire safety. Therefore, in the past, it was difficult to make a wooden structure from the viewpoint of fire safety. It can be applied to buildings or special-purpose buildings without any problems.

  Moreover, in the structure of the present embodiment, all the horizontal loads are borne by the main frame 3, and the column main body 6 only needs to bear a long-term vertical load. The material 7 and the main frame 3 need only be resisted with ultimate strength in the event of a fire, so that they are extremely rational in terms of structure.

  Of course, the joint member 8 and the suspension member 7 are non-combustible materials, and the joint member 8 is covered with the refractory material 17 as in the above embodiment, and is insulated at the connection point between the joint member 8 and the suspension member 7. It is certain that it will spread to other floors via the joint member 8 and the suspension member 7 by interposing the material 18 and attaching an appropriate fireproof sealing material to the important point as necessary. Can be prevented.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and appropriate design changes can be made. For example, as a modification of the joint member 8 shown in FIG. The one shown in 3 is also conceivable. In this configuration, the short pipe member 9 in the joint member 8 is omitted, and the upper and lower plate bodies 10 are directly connected to each other by the joining plate 13 to transmit the stress.

  In the above embodiment, one suspension member 7 is inserted into the pillar 4 on each floor. However, if necessary, two or more suspension members 7 may be used, and the suspension member 7 may be a desired suspension member. As long as it can bear the load, not only PC steel bars and PC steel stranded wires, but also appropriate steel materials such as small cross-section steel frames can be employed. Of course, various configurations can be considered for the form of the joint member 8 and the fireproofing and heat insulation treatments for the joint member 8. For example, in the embodiment shown in FIG. 4, the column main body 6 is formed in a cylindrical shape, and two suspension members 7 are inserted through the core portion of the column body 6. A total of four suspension members 7 are fixed to the upper and lower two. In this case, in order to avoid interference between the upper and lower suspension members 7, they may be arranged alternately. Further, it is preferable to thermally insulate the upper and lower sides of the joint member 8 by interposing a heat insulating material 19. Although not shown, the joint member 8 is made of an appropriate refractory material as in the above embodiment. It is preferable to cover with a refractory sealant or to place a refractory sealant at a critical point.

  Moreover, since the suspension member 7 of each floor was connected via the joint member 8 in the said embodiment, the construction can be performed sequentially for every floor, and the restoration after a fire should be performed only in a disaster floor. However, in some cases, it is conceivable that a long suspension material 7 is passed from the hat truss 2 to the lowermost floor, and the joint member 8 or the column main body 6 of each floor is mounted in the middle of the suspension material 7. However, in that case, it is necessary to reliably prevent the fire spread through the suspension material 7 by performing sufficient heat treatment on the suspension material 7 and the joint member 8.

  Furthermore, in the above embodiment, the main frame 3 is configured by the core wall 1 and the hat truss 2, but as long as the vertical load of each floor can be supported via the suspension member 7 and the collapse can be prevented, the main frame 3 The structure and form are arbitrary, and the structure and form of the beam 12 and the floor 5 are the same. The pillar 4 is not limited to a circular cross section, and may be a square cross section. Needless to say, the pillar body 6 may be made of either a solid material or a laminated material.

It is a figure which shows the outline | summary of the steel-steel composite structure which is one Embodiment of this invention. It is an enlarged view which shows the example of 1 structure of a joint part similarly. It is an enlarged view which shows the other structural example of a joint part similarly. It is an enlarged view which shows the other structural example of a joint part similarly.

Explanation of symbols

1 Core Wall 2 Hat Truss 3 Main Frame 4 Pillar (Composite Pillar)
DESCRIPTION OF SYMBOLS 5 Floor 6 Column main body 7 Suspension material 8 Joint member 9 Short pipe member 10 Plate body 11 Nut member 12 Beam 13 Joint plate 14 Base plate 15 Floor material 16 Ceiling material 17 Refractory material 18 Thermal insulation material 19 Thermal insulation material

Claims (4)

It is a steel and steel composite structure that mixes wood and steel as a structural material of a building,
It has a main frame with ultimate strength that can prevent at least collapse, and as a pillar of each floor provided separately from the main frame, a pillar body made of wood that can support long-term vertical load, and its core part in the vertical direction Adopting composite pillars with suspension material made of steel material to be inserted,
Columns on each floor are connected in the vertical direction, and the top of a series of suspension members in the series of columns is connected to the main frame, so that the vertical load at the end is suspended and supported by the main frame via the suspension members. A steel-steel composite structure characterized by being made possible.   The wood-steel composite structure according to claim 1, wherein a joint member is interposed between pillars of each floor continuously provided in the vertical direction, and suspension members on each floor are connected via the joint member. Characteristic wood composite structure.   3. The wood-steel composite structure according to claim 2, wherein a heat insulating material that thermally insulates the connection portion between the joint member and the suspension member is interposed.   4. The wood-steel composite structure according to claim 2, wherein the joint member is covered with a refractory material.

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