JP2015168921A - Steel plate unit, precast skeleton, skeleton construction method, and skeleton structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve rationalization from the aspect of execution of work, cost reduction and global environmental conservation, and enable construction of a skeleton combining high strength with vibration control performance.SOLUTION: A permanent column form 1A is constructed from a plurality of column steel plate units 10 in which a plurality of column steel plates 11 are combined together and which each has an outer surface covered with a fiber sheet F, and a column 1 is constructed by placing concrete C into the column form 1A. A longitudinal rib 8 and a transverse rib 9 are formed in the steel plate 11 of the column steel plate unit 10. The column steel plate unit 10 is assembled in the state of making the longitudinal ribs 8 face each other, and the transverse ribs 9 are stacked for construction of the column form 1A.

Description

  The present invention mainly relates to a steel plate unit, a precast housing, a steel plate unit, a method for constructing a housing using the precast housing, and a housing structure that are suitable for use in building a housing of a concrete structure such as a building.

  For buildings such as columns and beams in buildings made of reinforced concrete or steel frames and reinforced concrete, formwork according to the outer shape of the building is constructed with concrete plywood at the site, and reinforcing bars and steel frames are installed inside the formwork as necessary. From this state, a construction method is known in which concrete is placed inside the formwork and the concrete plywood of the formwork is removed after curing the concrete (Patent Document 1).

JP 2011-094476 A

  In the above conventional construction method, it is necessary to remove the formwork, which takes time in construction and causes an increase in construction cost. In addition, the concrete plywood of the formwork is usually Lauan wood, which has a problem in terms of the global environment because it logs and uses raw wood. On the other hand, in terms of structure, there are limits to the improvement of various strengths such as bending resistance, shear resistance, axial strength of columns, and toughness, and construction technology that has more seismic control effects against earthquake shaking is desired. .

  The present invention has been made in view of the above circumstances, and the main technical problems thereof are construction of a frame having rationality in construction, cost reduction, global environmental conservation, and high strength and vibration control. An object of the present invention is to provide a steel plate unit, a precast housing, a housing construction method, and a housing structure.

  The steel plate unit of the present invention is a steel plate unit in which a permanent formwork of a casing is constructed, and after the construction of the formwork, concrete is cast inside and the casing is constructed, corresponding to the outer shape of the casing A plurality of steel plates are joined and combined into a shape, and ribs that protrude inward and face each other are formed at the joint ends of these steel plates, and are adhered in a state where the outer surface of the steel plate is covered with a fiber sheet (Claim 1). In addition, the permanent formwork said by this invention means the formwork until a building is demolished until it loses the presence and function of a housing itself.

  In the steel plate unit of the present invention, the joining end portion of the steel plate is a side end portion of the steel plate, and a vertical rib extending in the vertical direction is formed on the side end portion as the rib. (Claim 2).

  In the steel plate unit of the present invention, the ribs are opposed to each other in a state in which the ribs are in direct contact with each other or a viscoelastic member is sandwiched therebetween (Claim 3).

  Moreover, in the steel plate unit of this invention, the horizontal rib extended in a horizontal direction is formed in the up-and-down edge part of the said steel plate, It is characterized by the above-mentioned. (Claim 4).

  Next, in the construction method of the casing of the present invention, a permanent formwork of the casing is constructed using the steel plate unit according to any one of claims 1 to 4, and concrete is placed inside the formwork. (Claim 5).

  In the construction method of the housing of the present invention, the steel plate is in a state where the steel plate unit is subjected to a predetermined force in a state in which the horizontal rib is in direct contact or a viscoelastic member is sandwiched between the horizontal ribs. It joins in the state which can be moved relatively (Claim 6).

  Next, the precast case of the present invention is constructed by constructing a permanent formwork of the case using the steel plate unit according to any one of claims 1 to 4 and placing concrete inside the formwork. (Claim 7).

  Moreover, the construction method which joins the precast housing of the said Claim 7 and builds a housing is also the characteristics of the construction method of the housing of this invention (Claim 8).

  Next, the frame structure of the present invention includes a permanent formwork of a building structure by a steel plate unit formed by joining a plurality of steel plates, and a fiber sheet that is coated and adhered to the outer surface of the steel plate of each formwork. And ribs that protrude inward and that face each other are formed at the joint ends of the steel plates that constitute the formwork. (Claim 9)

  In the frame structure of the present invention, the joining end portion of the steel plate is a side end portion of the steel plate, and a vertical rib extending in the vertical direction is formed on the side end portion as the rib. (Claim 10).

  In the housing structure of the present invention, the ribs face each other in a state in which the steel plates are relatively movable when subjected to a predetermined force in a state where they are in direct contact or with a viscoelastic member sandwiched therebetween. (Claim 11).

  In the casing structure of the present invention, the steel plate units are stacked one above the other and joined, and lateral ribs extending in the lateral direction are formed at the upper and lower ends of the steel plate, and the horizontal ribs are directly overlapped and contacted. The steel plates are laminated so as to be movable relative to each other when a predetermined force is applied in a state where the viscoelastic member is interposed therebetween (claim 12).

  In the present invention, at the construction site, concrete can be placed inside a mold made of a steel plate unit corresponding to the outer shape of the casing, and the target casing can be constructed while leaving the mold as a permanent mold. According to the present invention, since a formwork obtained by joining and combining a plurality of steel plate units is left as a permanent formwork, the work for removing the formwork is not required as in the prior art. For this reason, rationalization in construction and cost reduction are achieved. In addition, because it does not use conventional concrete plywood, it reduces the logging of raw Lauan timber and contributes to global environmental conservation.

  In addition, in a factory or the like, a plurality of steel plate units are joined together to construct a permanent form of the frame, and concrete is placed inside the form to produce a precast frame, which is then installed at the construction site. By assembling, the construction can be rationalized and the cost can be reduced.

  In terms of the structure, each steel plate unit becomes a strength member in order to leave a mold formed of a plurality of steel plate units as a permanent mold, and the ribs of the steel plate constituting each steel plate unit are embedded in concrete. Moreover, the fiber sheet is adhere | attached on the outer surface of the steel plate of each steel plate unit. With these configurations, various strengths such as bending resistance of the frame, shear resistance, axial strength of the column, and toughness are improved. Further, the ribs of the steel plate promote integration with concrete and further improve the strength.

  In addition, when a large force is received due to an earthquake or the like, friction may occur between the relatively movable ribs, and friction may also occur between the ribs and the concrete. This friction force suppresses vibration. It becomes a damper. For this reason, the damping effect with respect to seismic force is demonstrated. That is, in the present invention, the case where a predetermined force is received mainly assumes a case where a seismic force is received, and the rib exhibits a seismic control effect against the seismic force.

  The opposing ribs may be in a state of direct contact or a state in which a viscoelastic member is sandwiched therebetween. When the viscoelastic member is sandwiched between the opposing ribs, the viscoelastic member produces a viscoelastic damper effect when vibration is received due to an earthquake or the like, and the damping performance is effectively exhibited. For this reason, the effect which attenuates a shake and suppresses a shake quickly, or makes a shake small is acquired.

  According to the present invention, a steel plate unit, a precast housing, a construction method for a housing, which can be rationalized in terms of construction, cost reduction and global environment conservation, and can build a housing having high strength and vibration control, and There exists an effect that a frame structure is provided.

It is a side view which shows the pillar which is the housing of one Embodiment of this invention, and a pillar and beam junction part. It is a cross-sectional view of the pillar of one Embodiment, Comprising: (a) shows the case where a column steel plate is U-shaped, (b) shows the case where a column steel plate is L-shaped. It is a cross-sectional view which shows the column steel plate unit of one Embodiment, Comprising: (a) shows the case where a column steel plate is U shape, (b) shows the case where a column steel plate is L shape. It is sectional drawing which shows the vertical rib of the column steel plate of the same column steel plate unit, (a) The state which the vertical ribs contact | abuts directly, The state which pinched | interposed the viscoelastic member between the vertical ribs is shown. . It is sectional drawing which shows the horizontal rib of the column steel plate of the column steel plate unit, (a) The state which the horizontal rib contact | abuts directly, (b) The state which pinched | interposed the viscoelastic member between horizontal ribs is shown . It is a cross-sectional view of the column / beam joint of one embodiment. It is a longitudinal cross-sectional view which shows the beam part of the column and beam junction part. It is a cross-sectional view of the column / beam steel plate unit of one embodiment. It is sectional drawing which shows the vertical rib formed in the side surface center steel plate and the side edge part steel plate of the pillar and beam steel plate unit, respectively, (a) The state where the vertical ribs are in direct contact, (b) Between the vertical ribs Shows a state in which a viscoelastic member is sandwiched.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a column 1 and a column / beam joint 2 which are a frame constructed according to an embodiment of the present invention. The column 1 is constructed between the floor slabs 4 constituting the floor around the column 1, and the column / beam junction 2, which is a junction between the column 1 and the beam 3, is constructed in a portion corresponding to the floor slab 4 between the columns 1. Has been. The beam 3 is constructed extending from the column / beam joint 2, and a floor slab 4 on the upper floor is constructed on the upper surface of the beam 3. Hereinafter, the structure after the construction of the column 1 and the column / beam joint 2 and the construction method for obtaining the structure will be described.

[1-1] Column Structure As shown in FIG. 2 (a), the column 1 has a square cross section, and is a permanent column type in which a plurality of column steel plate units 10 are stacked from the bottom to the top. In the frame 1A, a reinforcing bar rod 100 for reinforcement extending vertically is arranged and concrete C is placed. The reinforcing bar rod 100 is provided near the inner surface of the columnar frame 1A and extends vertically, and a plurality of strips 102 that are fastened to the outside of the main bars 101 at equal intervals in the vertical direction. It consists of.

  As shown in FIG. 3A, the column steel plate unit 10 constituting the column mold 1 </ b> A is a combination of a plurality of column steel plates 11 having a shape corresponding to the outer shape of the column 1, and is formed on the entire outer surface of these column steel plates 11. The fiber sheet F is wound and covered. The column steel plate 11 is formed by bending a middle portion in the longitudinal direction of a rectangular material steel plate at a right angle into a U-shape, and in a set of two sheets, the both ends are opposed to each other so that the cross-sectional shape of the rectangular column is obtained. They are combined into a square box in plan view that opens in the corresponding vertical direction.

  The column steel plate 11 shown in FIG. 3 (a) is formed in a U-shape, and a set of two steel plate units 10 is formed. However, as shown in FIG. The column steel plate unit 10 may be configured by forming an L shape and assembling the four sheets into the cross-sectional shape of the column 1. In the case of such an L-shaped column steel plate 11 as well, vertical ribs 8 are formed at both ends, and horizontal ribs 9 are formed at the upper and lower ends. FIG. 2 (b) shows the pillar 1 constructed when the pillar steel plate unit 10 is composed of a set of four L-shaped pillar steel plates 11.

  As shown to Fig.4 (a), the fixed rib vertical rib 8 which protrudes inside is formed in the both ends of the column steel plate 11 over the full length of the side edge part. Moreover, as shown to Fig.5 (a), the horizontal rib 9 of the fixed width | variety protruded inside is formed in the upper end edge and lower end edge of the column steel plate 11 over the full length of those end edges. The vertical rib 8 and the horizontal rib 9 have the same width, and are formed by bending the column steel plate 11. When the column steel plates 11 are combined in a box shape, the longitudinal ribs 8 are brought into direct contact with each other, and this state is temporarily fixed by a clip or the like so as to be slidable with each other, thereby maintaining the joined state.

  The thickness of the pillar steel plate 11 is, for example, about 1.6 to 3.2 mm, the height is, for example, about 300 to 600 mm, and the widths of the vertical ribs 8 and the horizontal ribs 9 are, for example, about 20 to 100 mm.

  As the fiber sheet F, for example, a method in which a continuous sheet-like fiber processed into a strip shape is impregnated with an adhesive is wound while applying tension to the outer surface of the column steel plate unit 10. In this way, the single long fiber sheet F can be easily stretched over the entire surface of the column steel plate unit 10, and can be bonded to the outer surface of the column steel plate 11 simultaneously with winding by the impregnating adhesive.

  Examples of the fiber material of the fiber sheet F include polyethylene, carbon, glass, vinylon, aramid, and the like, and polyethylene and carbon excellent in alkali resistance are preferable.

[1-2] Column Construction Method Next, a construction method for constructing the column 1 will be described.
As described above, the two column steel plates 11 (four in the case of the L-shaped column steel plate 11 in FIG. 3B) are combined in a box shape by bringing the vertical ribs 8 at both ends into contact with each other. A plurality of column steel plate units 10 covered with a fiber sheet F wrapped around the entire outer surface of the steel plate 11 are sequentially stacked on the floor slab 4 of the lower floor to construct a permanent column form 1A. When constructing the column form frame 1A, as shown in FIG. 5 (a), the horizontal ribs 9 of the upper column steel plate 11 are placed on the horizontal ribs 9 of the lower column steel plate 11 and overlapped. The horizontal ribs 9 are in direct surface contact with each other.

  In this way, while placing the horizontal rib 9 at the lower end of each column steel plate 11 in the upper column steel plate unit 10 on the horizontal rib 9 at the upper end of each column steel plate 11 in the lower column steel plate unit 10, The column steel plate units 10 are stacked in multiple stages to construct a permanent column mold 1 </ b> A of the column 1. Note that the stacked columnar steel plate units 10 temporarily hold the stacked horizontal ribs 9 so as to be slidable with clips or the like, and suppress the displacement of the upper and lower column steel plate units 10. Further, reinforcing bar rods 100 for reinforcement are arranged in the column mold 1A. The reinforcing bar 100 is appropriately arranged together with the stacking of the column steel plate units 10, and for example, the main bar 101 is erected first and the band 102 is fastened to the main bar 101 from the bottom, or the pre-assembled reinforcing bar 100 is attached to the column mold 1A. For example, a method is adopted in which the steel plate unit 10 is dropped from above to arrange the bars, and the column steel plate units 10 are sequentially stacked around the reinforcing bar 100.

  Next, concrete C is filled and placed in the column mold 1A in which the reinforcing bar 100 is arranged, and the concrete C is cured.

[2-1] Structure of Column / Beam Joint As shown in FIG. 6, the beam 3 is constructed in a cross shape orthogonal to the four side surfaces of the column 1 and the beam 3 is joined to the four surfaces of the column 1. Is the column / beam joint 2. The width of the beam 3 is smaller than the width of the column 1, and four corners 1 a corresponding to the outer shape of the column 1 are formed. The column / beam joint portion 2 includes a column portion 2a and a beam portion 2b of a short beam extending horizontally from the column portion 2a in all directions. A floor slab 2 is constructed on the upper surface of the beam 3 including the beam portion 2b.

  As shown in FIGS. 6 and 7, the column / beam joint 2 is reinforced in the extending direction of the beam 3 inside the column / beam steel plate unit 20 having a shape corresponding to the outer shape of the column / beam joint 2. Reinforcing bar 200 is arranged and concrete C is cast.

  As shown in FIG. 7, the reinforcing bar rod 200 includes a main bar 201 at the lower end extending along the beam 3, a main bar 202 parallel to the main bar 201 arranged at a level in the floor slab 4, and these main bars 201, 202. And a plurality of gluteal muscles 203 which are tightly connected at equal intervals in the horizontal direction. In this case, in the column / beam joint 2, one column / beam steel plate unit 20 constitutes a permanent column / beam formwork.

  As shown in FIG. 8, the column / beam steel plate unit 20 is in contact with the side surface central steel plate 21 that forms the side surface of the column portion 2 a and the beam portion 2 b extending from the column portion 2 a and the side end portion of the side surface central steel plate 21. The side surface end steel plates 22 that form the beam portions 2b and the lower surface steel plates 23 that are joined to cover the lower ends corresponding to the beam portions 2b of the steel plates 21 and 22 to form the lower surface are combined. The fiber sheet F is coated on the entire outer surface of 23.

  The side central steel plate 21 is bent into a substantially M-shaped cross section that forms an outer shape including a corner portion 1a with a central portion extending from the column portion 2a to the beam portion 2b, and has four pieces so as to form the column portion 2a. The side surface steel plate 21 is disposed, and the side surface end steel plate 22 is brought into contact with the side end portion of the side surface central steel plate 21. As shown in FIG. 9 (a), vertical ribs 8 extending in the vertical direction projecting inward and extending in the vertical direction are provided at the abutting ends of the side central steel plate 21 and the side end steel plates 22, respectively. Each is formed over the entire length of the part. The side central steel plate 21 and the side end steel plate 22 are brought into contact with each other by vertically superimposing the vertical ribs 8, and this state is temporarily fixed by a clip or the like so as to be slidable with each other. Moreover, the lower surface steel plate 23 is joined to the lower end surface of each side surface central steel plate 21 and each side surface end steel plate 22 by welding.

  The longitudinal ribs 8 of the side central steel plate 21 and the side end steel plates 22 are formed by bending the side end portions of the steel plates 21 and 22. The thickness of the side central steel plate 21 and the side end steel plate 22 and the vertical ribs 8 are about 1.6 to 3.2 mm, for example, and the width of the vertical ribs 8 is about 20 to 100 mm, for example. Is used.

  The fiber sheet F is made of the same material as that of the column steel plate unit 10, and the one processed into a strip shape and impregnated with an adhesive is adhered to the entire surface of the column / beam steel plate unit 20. In the column / beam joint 2, as shown in FIG. 7, a plurality of tie bars 7 extending in the horizontal direction are passed through and fastened to predetermined positions of the beam 2b, thereby fastening the steel plate due to the lateral pressure generated when the concrete C is placed. The spread of 21 and 22 is suppressed.

[2-2] Construction Method for Column / Beam Joint 2 Next, a construction method for constructing the pillar / beam joint 2 will be described.
As described above, the four side surface central steel plates 21 are combined so as to form the column portion 2a, and the side end steel plates 22 are disposed at the ends of the side surface central steel plates 21, respectively. A column / beam steel plate unit 20 in which the lower ends of the beam portions 2b are covered with the lower surface steel plates 23 and the outer surfaces of these steel plates 21, 22, 23 are covered with the fiber sheet F is connected to a predetermined column / beam joint portion. Set in 2 construction points. Next, the reinforcing bar 200 is arranged in the column / beam steel plate unit 20. Usually, the column / beam joint 2 is often constructed simultaneously with the column 1, and in that case, the column is placed on the uppermost column steel plate unit 10 of the column mold 1A before filling the concrete C therein. The beam steel plate unit 20 is joined and set, and the reinforcing bar rods 100 and 200 are arranged in the column / beam formwork 1A and the column / beam steel plate unit 20, respectively. Then, the tie bar 7 is fixed to the column / beam steel plate unit 20.

  Next, the concrete C is filled and placed in the column / beam steel plate unit 20 in which the reinforcing bar 200 is arranged, and the concrete C is cured. When the column 1 and the beam joint 2 are simultaneously constructed together with the column 1, the concrete C is filled into the column mold 1 </ b> A and the column / beam steel plate unit 20.

  The above is the structure of the column and the column / beam joint 2 and the construction method. The beam 3 is continuously constructed on the beam 2b of the column / beam junction 2, and the floor slab 4 is formed on the top of the beam 3. It is constructed.

  In the above-described embodiment, at the construction site, the column steel plate unit 10 and the column / beam steel plate unit 20 are joined and combined according to the outer shapes of the column 1 and the column / beam junction 2 which are the casings, respectively. , 20 and concrete C can be placed inside, and the target column 1 and the column / beam joint 2 can be constructed with the steel plate units 10 and 20 left as permanent molds. Since the formwork obtained by joining and combining the steel plate units 10 and 20 is left as a permanent formwork, the work of removing the formwork is not required as in the prior art. For this reason, rationalization in construction and cost reduction are achieved. In addition, because it does not use conventional concrete plywood, it reduces the logging of raw Lauan timber and contributes to global environmental conservation.

  In terms of the structure, the steel plate units 10 and 20 remain as permanent molds, so that the steel plate units 10 and 20 become strength members, and the vertical ribs of the plurality of steel plates 11, 21, 22 and 23 constituting the steel plate units 10 and 20. 8 and horizontal ribs 9 are embedded in the concrete C, and fiber sheets F are bonded to the outer surfaces of the steel plates 11, 21, 22, 23 of the steel plate units 10, 20, respectively. With these configurations, various strengths such as bending resistance, shear resistance, and toughness of the frame, that is, the column 1 and the column / beam joint 2 are improved, and the axial strength in the column 1 is improved. Furthermore, the vertical rib 8 and the horizontal rib 9 of each steel plate 11, 21, 22 promote integration with the concrete C and further improve the strength.

  Further, when a large force is received due to an earthquake or the like, friction is generated between the contacting vertical ribs 8 and the horizontal ribs 9, and this frictional force becomes a damper that suppresses the movement. For this reason, the damping effect with respect to seismic force is demonstrated.

  In particular, between the horizontal ribs 9 of the column steel plate units 10 in which the horizontal ribs 9 overlap each other, when the seismic force swaying in the horizontal direction is applied, the steel plates 11 individually move in the horizontal direction or deform (referred to as shear deformation). In other words, the horizontal ribs 9 that overlap each other are relatively displaced and rubbed with each other, and friction is generated between them. The frictional force in this case corresponds to the load applied from the lateral rib 9 of the upper steel plate 11 to the rib 9 of the lower steel plate 11, but the lower rib 9 directly applies the load from the upper rib 9. In order to receive, the load which the lower rib 9 receives is large. For this reason, the frictional force against the seismic force becomes large, the frictional force becomes a damper, the movement of the steel plate 11 in the horizontal direction is suppressed, and the seismic control effect is remarkably obtained.

  On the other hand, when receiving an earthquake force that shakes in the vertical direction due to an earthquake, the steel plates 11, 21, 22 move individually in the vertical direction or deform (the above-described shear deformation), and the steel plates 11, 22, 22. The vertical ribs 8 in contact with each other are relatively displaced and rub against each other, and friction is generated between them. The frictional force generated between the vertical ribs 8 that contact in this way becomes a damper, and the movement of the steel plates 11, 21, 22 in the vertical direction is suppressed, and the vibration control effect is remarkably obtained.

  Further, when the vertical rib 8 and the horizontal rib 9 move together with the steel plates 11, 21 and 22 due to a large force due to an earthquake or the like, between the vertical rib 8 and the concrete C or between the horizontal rib 9 and the concrete C There is also a case where friction occurs, and this frictional force becomes a damper that suppresses vibration and exhibits a seismic control effect on the seismic force.

  In the above embodiment, the vertical ribs 8 and the horizontal ribs 9 are in direct contact with each other. However, as shown in FIGS. 4B, 5B, and 9B, the vertical ribs 8 are in contact with each other. The viscoelastic member 6 may be sandwiched between the 8 or the lateral ribs 9. As the viscoelastic member 6, for example, a material made of rubber such as natural rubber or synthetic rubber is used. When the viscoelastic member 6 is sandwiched between the vertical ribs 8 and the horizontal ribs 9 in this way, the viscoelastic member 6 produces a viscoelastic damper effect when receiving vibration due to an earthquake or the like, and the damping performance is effectively improved. Demonstrated. For this reason, the effect which attenuates a shake and suppresses a shake quickly, or makes a shake small is acquired.

  In the above embodiment, the pillar steel plate unit 10 and the pillar / beam steel plate unit 20 are configured so that the necessary number is manufactured in advance at a factory or the like, and is transported to the construction site. A method is also included in which concrete is cast into the interior of the housing to produce a precast housing, which is assembled at the construction site. According to this, it is possible to shorten the construction time and build the housing at the site, and rationalize the construction and reduce the cost.

  In addition, stress such as tension and shear is transmitted from the concrete C to the fiber sheet F through the steel plates 11, 22, 22, and 23. The fiber sheet F has a high resistance to such stress, and for example, may have a tensile strength of about 10 times or more compared with a normal steel plate. For this reason, the column 1 and the column / beam joint 2 which are the casings have high strength and toughness.

1 ... Pillar (frame)
1A ... Column form 2 ... Column / beam joint (frame)
6 ... Viscoelastic member 8 ... Vertical rib 9 ... Horizontal rib 10 ... Column steel plate unit 11 ... Column steel plate 20 ... Column / beam steel plate unit (column / beam formwork)
21 ... side central steel plate 22 ... side end steel plate 23 ... bottom steel plate C ... concrete F ... fiber sheet

Claims (12)

It is a steel plate unit in which a permanent formwork of a frame is constructed, and after the construction of the formwork, concrete is placed inside and the frame is constructed.
A plurality of steel plates are joined and combined in a shape corresponding to the outer shape of the casing, and ribs that protrude inward and face each other are formed at the joint ends of these steel plates, and a fiber sheet is formed on the outer surface of the steel plate. A steel plate unit that is bonded in a coated state.   The steel plate unit according to claim 1, wherein the joining end portion of the steel plate is a side end portion of the steel plate, and a vertical rib extending in the vertical direction is formed on the side end portion as the rib. .   3. The steel plate unit according to claim 1, wherein the ribs face each other in a state in which the ribs are in direct contact or in a state in which a viscoelastic member is sandwiched therebetween.   The steel plate unit according to any one of claims 1 to 3, wherein horizontal ribs extending in a horizontal direction are formed at upper and lower ends of the steel plate.   A method for constructing a casing, comprising constructing a permanent formwork of the casing using the steel plate unit according to any one of claims 1 to 4, and placing concrete in the inside of the formwork.   In a state where the lateral ribs are in direct contact, or in a state where a viscoelastic member is sandwiched between the lateral ribs, the steel plate unit is bonded to a state in which the steel plate is relatively movable when a predetermined force is applied. The construction method of the frame of Claim 5 characterized by the above-mentioned.   A precast casing comprising a permanent formwork of a box using the steel plate unit according to any one of claims 1 to 4 and placing concrete inside the formwork.   A construction method for a chassis, comprising building the chassis by joining the precast chassis according to claim 7. A permanent formwork of a building frame by a steel plate unit formed by joining a plurality of steel plates;
A fiber sheet coated and bonded to the outer surface of the steel plate of each mold,
Having concrete cast inside the mold,
A casing structure in which ribs that protrude inward and face each other are formed at joint ends of the steel plates constituting the mold.   The casing structure according to claim 9, wherein the joining end portion of the steel plate is a side end portion of the steel plate, and a vertical rib extending in the vertical direction is formed on the side end portion as the rib. .   The ribs are opposed to each other so that the steel plates can be moved relative to each other when a predetermined force is applied in a state in which the ribs are in direct contact with each other or a viscoelastic member is sandwiched therebetween. The housing structure according to claim 10. The steel plate units are stacked on top and bottom and joined,
Lateral ribs extending in the lateral direction are formed on the upper and lower ends of the steel plate,
The steel sheet is laminated in a state in which the transverse ribs can be relatively moved when receiving a predetermined force in a state where the lateral ribs are in direct contact with each other or in a state where a viscoelastic member is sandwiched therebetween. The housing structure according to any one of claims 9 to 11.

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