JP6144030B2 - Reinforcing structure of planar structure and reinforcing method of planar structure - Google Patents

Description

  The present invention relates to a reinforcing structure for a planar structure and a reinforcing method for the planar structure. More specifically, the present invention relates to a reinforcing structure of a planar structure that is provided via a structural housing and forms a space inside, and a reinforcing method of the planar structure.

  Conventionally, for example, a method disclosed in Patent Document 1 is known as a method for reinforcing a finishing material having a large area including a ceiling. In this reinforcing method, since the wire is connected to the ceiling base material (field edge or field edge receiver), the construction from the lower surface side of the ceiling is complicated.

JP 2008-121371 A

  In view of such conventional circumstances, the present invention provides a reinforcing structure for a planar structure and a reinforcement for the planar structure, which have a simple structure but are excellent in workability and can improve the strength against an earthquake or dead weight. It aims to provide a method.

  In order to achieve the above object, the feature of the reinforcing structure of the planar structure according to the present invention is that the planar structure is provided via a structural housing and reinforces the planar structure that forms a space inside. The body is a ceiling finishing material provided on a ceiling base material supported by a ceiling slab with a suspension material, and the space is an indoor space formed in a lower portion of the ceiling finishing material, and an end portion is formed on the structural housing. A string member to be connected; and a holding member that is fixed to the surface of the ceiling finishing material on the indoor space side and holds the string member on the surface of the ceiling finishing material; and It is arranged in a non-linear shape over the surface through a holding member, and the string-like member is held by the holding member so as to be slidable in the axial direction of the string-like member, and acts on the ceiling finishing material during an earthquake. To distribute the horizontal force load to the holding member. Located in. Here, the “non-linear shape” refers to a parabola, an arc, an elliptical arc, a sine curve, a hyperbola, a catenary line, and the like, and a polygon that substantially approximates these.

  According to the said structure, the said planar structure used as the object of reinforcement is the ceiling finishing material provided in the ceiling base material supported by the suspension material on the ceiling slab (ceiling surface). And the string-like member which fixed the edge part to the structure housing should just be arranged on the space side surface of a planar structure via a holding member, and construction is very easy. In addition, by arranging the string-like member in a non-linear shape on the surface of the planar structure on the space side, the string-like member has high rigidity with respect to the direction perpendicular to the axis connecting the ends of the string-like member. It is possible to improve the strength against. In addition, since the string-like member is held by the holding member so as to be slidable in the axial direction of the string-like member, both elastic rigidity and geometric rigidity are expressed, and the entire string-like member The load can be supported and the burden load can be dispersed. Therefore, it can endure a large load, and the reinforcement strength (seismic resistance) can be improved.

  The said structure WHEREIN: The said string-like member is good to be stretched between the said structural bodies in the state which removed the slack. By introducing the initial tension, the horizontal rigidity of the planar structure can be improved and the response displacement can be reduced. As a result, it is possible to avoid damage due to deformation of the member or collision with the peripheral member, and to improve the reinforcement strength such as earthquake resistance. Here, the initial tension of the string-like member is set to be greater than 0N and 1000N or less, for example. The stiffness can be adjusted by the initial tension.

  An initial tension may be applied to the string-like member. By arranging without slack, displacement can be constrained in the pulling direction of the string-like member.

  The non-linear shape is preferably a parabolic shape. With this shape, the load generated on the plane of the planar structure can be uniformly supported over the entire length of the string-like member, the burden load on the planar structure can be reduced, and the strength can be further improved. In this case, the sag depth of the string-like member is preferably ¼ of the distance between the structural bodies.

  A plurality of the holding members may be provided at equal intervals. Thereby, the load burden per holding member can be equalized, and the strength is improved.

  The holding member may be configured to have a recess that receives the string-like member at the center of the surface of the planar structure that is in close contact with the surface. Thereby, when tension is applied to the string-like member during an earthquake, the string-like member can be prevented from entering between the surface of the planar structure body and the holding member, and the horizontal proof stress can be further improved. .

  In any one of the characteristic configurations described above, for example, the structural casing is a pillar.

In order to achieve the above object, the planar structure reinforcing method according to the present invention is characterized in that in the method of reinforcing a planar structure that is provided via a structural housing and forms a space inside, the planar structure is provided. The body is a ceiling finishing material provided on a ceiling base material supported by a suspension material on a ceiling slab, and the space is an indoor space formed in a lower portion of the ceiling finishing material, and the room of the ceiling finishing material A holding member is fixed to the surface on the space side, and a string-like member is arranged in a non-linear shape over the surface via the holding member, and an end portion of the string-like member is connected to the structural housing, The string-like member is held by the holding member so as to be slidable in the axial direction of the string-like member, and a load of a horizontal force acting on the ceiling finishing material at the time of an earthquake is distributed to the holding member.

  According to the features of the reinforcing structure of a planar structure and the reinforcing method of the planar structure according to the present invention, it is possible to improve the workability and improve the strength against earthquakes, dead weight, etc. while having a simple structure. became.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

It is a perspective view which shows the example which applied the reinforcement structure of the planar structure which concerns on this invention to the ceiling. It is a perspective view which shows an example of a holding member vicinity. It is a top view of the ceiling shown in FIG. It is a front view of a holding metal fitting, (a) is a pressing member having a U-shaped concave portion, (b) is another pressing member having a substantially V-shaped concave portion, and (c) is a wire in the metal fitting of (b). It is a figure which shows typically the state which went under. It is a top view of a holding metal fitting. It is sectional drawing of the ceiling of a pressing metal vicinity. It is a schematic diagram of wire end part vicinity. It is a figure which shows an example of a damper, (a) is a perspective view, (b) is a front view. It is a figure which shows an example of a connection member, (a) is a perspective view, (b) is a front view. It is a figure which shows an example of the connection part of a wire edge part. It is a figure which shows an example of the fixed metal fitting of a structure housing, (a) is a top view, (b) is a front view. It is a figure explaining the concentrated load with respect to a wire. It is a figure explaining the self-weight type load with respect to a wire. It is a figure explaining the equally distributed load with respect to a wire. It is a figure explaining the parabolic shape of a wire, (a) is a figure which shows the relationship with the string-like member which balances a y direction equal distribution load, (b) is a figure which shows the balance of a micro cable element. It is a figure explaining the sag in a parabola shape. It is a figure explaining the difference by the arrangement | positioning shape of a wire, (a) shows linear arrangement | positioning, (b) shows parabolic arrangement | positioning. It is explanatory drawing which shows the relationship between the magnitude | size of the seismic force which acts on a ceiling finishing material at the time of an earthquake, the tension | tensile_strength applied to the edge part of the wire which bears this seismic force, and a component force. It is explanatory drawing which shows the initial tension applied to a wire, the direction change of the initial tension in each pressing metal fitting, and the change of the magnitude of the component force. It is a figure which shows the example of the variation of the arrangement | positioning shape of a wire. It is a figure which shows an example of the other arrangement | positioning shape of a wire. It is a figure which shows the example of the other arrangement | positioning shape of a wire. The relationship between the parabolic symmetry axis X and the maximum displacement direction Xd1 or the maximum acceleration direction Xd2 is shown. (A) is a flat ceiling, (b) is a ceiling with an oblique gradient. It is.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings as appropriate. Hereinafter, in the present embodiment, a ceiling earthquake-resistant reinforcing structure will be described as an example of a reinforcing structure of a planar structure that is provided via a structural housing and forms a space therein.

  The seismic reinforcement structure 1 for a ceiling according to the present embodiment is roughly provided between a ceiling slab and a column 6 as a “structural frame” integrally supporting a ceiling slab (ceiling surface) (not shown) and supporting the ceiling slab. The field edge receiver 2 and the field edge 3 as the ceiling foundation material that defines the back space, the ceiling finishing material 4 as the “planar structure” attached to the lower surface of the field edge 3, and the ceiling finishing material 4 The wire 5 as a “string-like member” disposed on the space side surface (lower surface) 4a facing the indoor space formed in the lower part and the surface 4a of the ceiling finishing material 4 are secured with a gap therebetween, and the wire 5 is It comprises a plurality of presser fittings 10 as “holding members” for holding the wires 5 so as to be arranged in a non-linear shape on the surface 4 a of the ceiling finishing material 4. Both ends of the wire 5 are fixed to pillars 6 as a structural housing. The non-linear shape is a single curve shape (parabola, arc, elliptical arc, sine curve, hyperbola, catenary, etc.) or a polygonal shape substantially equivalent to this curve shape connecting the ends of the wire 5. Any curved shape or polygonal shape that is axially symmetric with respect to a perpendicular bisector with respect to a straight line connecting both ends of the wire 5 may be used. In the example of illustration of this embodiment, the wire 5 is arrange | positioned at the polygonal shape which exhibits substantially parabolic shape. Note that this ceiling is a suspended ceiling in which the field edge receiver 2 and the field edge 3 as the ceiling base material are suspended from a ceiling slab (not shown) by a suspension material.

  Here, for example, a C channel is used for the field edge receiver 2 and the field edge 3. In the present embodiment, a gypsum board (PB) 41 and a rock wool sound absorbing plate 42 are used for the ceiling finishing material 4. In the present embodiment, the wire 5 having a diameter of 6 mm is used.

  As shown in FIGS. 4 and 5, the presser fitting 10 includes a flat portion 11 that is in close contact with the lower surface 4 a (the surface on the indoor space side) of the ceiling finishing material 4, and a concave portion in which the wire 5 is disposed at the center of the flat portion 11. The flat portion 11 is provided with a plurality of through-holes 14 through which screws 13 as fixing members for fixing the mounting bracket 10 to the lower surface 4 a of the ceiling finishing material 4 are formed on both sides of the recess 12. .

  The wire 5 is merely disposed in the recess 12 and is not fixed to the ceiling material 4 and the pressing metal 10 by the pressing metal 10. That is, the wire 5 is disposed so as to be slidable in the axial direction of the wire 5 with respect to the ceiling material 4.

  Here, the presser fitting 10 as the holding member has a recess 12 for receiving the wire 5 as the string-like member at the center of the surface in close contact with the surface 4a of the ceiling finishing material 4 as the planar structure. It is configured. That is, the width W1 and the depth D1 of the recess 12 are approximately the same as the diameter of the wire, and the cross-sectional shape of the recess 12 is substantially square. Thereby, in the state which has arrange | positioned the wire 5 in the ceiling finishing material 4, as shown to FIG.1, 2,6, the movement to the horizontal direction and the perpendicular direction orthogonal to the axial direction of the wire 5 is restrict | limited. Therefore, the deformation of the metal fitting 10 due to the movement of the wire 5 is prevented when vibrating, and when a tension is applied to the string-like member (wire 5) during an earthquake, the string-like member (wire 5) becomes a surface of the planar structure ( It is possible to prevent a dive between the lower surface 4a) of the ceiling finishing material 4 and the holding member (holding metal fitting 10), and the horizontal proof stress can be further improved. In addition, what has the clearance of the grade which the wire 5 can slide to the axial direction (concave longitudinal direction) is included with substantially the same dimension.

  Further, the shape of the concave portion 12 of the presser fitting 10 is preferably substantially U-shaped as shown in FIG. According to the experiments by the inventors, it has been found that the substantially horizontal U-shaped recess 12 has a larger maximum horizontal proof stress compared to the substantially V-shaped recess 12 ′ shown in FIG. . In the case of the substantially V-shaped recess 12 ′, as shown in FIG. 5C, when a horizontal load is applied to the wire 5, the wire 5 sinks between the surface 4 a of the ceiling finishing material 4 and the metal fitting 10. It may be because there are cases.

  Further, a rubber plate 15 may be provided in the recess 12 as a cushioning material at the bottom, as indicated by a one-dot chain line in FIG. This prevents the wire 5 in the recess 12 from moving in the vertical direction Z and the accompanying vibration noise.

  As shown in FIG. 7, both end portions of the wire 5 are connected and fixed to a column 6 as a “structural frame” through a connecting member 50 and a fixed hardware 60 each including a turnbuckle 51 and a damper 52. The end of the wire 5 is connected to one end of the turnbuckle 51 via a connecting member 53 such as a griple 53a or a thimble 53b. In the example of the figure, the damper 52 is a hydraulic type.

  The damper 52 is not limited to a hydraulic system, and may be configured as shown in FIG. 10 by attaching dampers using high damping rubber as shown in FIGS. 8 and 9 and eye nuts at both ends thereof, for example. . Furthermore, there are various methods such as using a hydraulic system and a spring in parallel, using an air spring and a damper together, using a viscoelastic damper, and using a plastic damper.

  The other end of the turnbuckle 52 is connected to the fixed hardware 60 via the damper 52. As shown in FIG. 11, the fixed hardware 60 is generally composed of a mounting plate 61 and a substantially U-shaped bolt 62, and is fixed to a column. Thereby, the wire 5 is connected and fixed to the column 6.

Next, the effect of the polygonal arrangement shape on the earthquake will be described.
In this reinforcing method, the wire 5 is fastened to the ceiling finishing material 4 with the metal fitting 10 while keeping the wire 5 along the parabola on the surface 4a of the ceiling finishing material 4 on the indoor side, and the end of the wire 5 is anchored to the column. Therefore, when the seismic force is input, the wire 5 aims at the effect of suppressing the horizontal behavior of the entire ceiling.

  The significance of the parabolic cable shape will be described with reference to FIGS. Since the string-like member such as the wire 5 has no compressive force or resistance to bending, the force is transmitted to the fulcrum only by the pulling force while changing the shape of the string-like member according to the force or distribution to be borne. Examples of the shape when the string-like member naturally supports the force in the concentrated load and the distributed load are shown in FIGS.

  In the concentrated load as shown in FIG. 12, naturally, a straight line that bends at one point where the load acts is drawn. On the other hand, in the distributed load, when a uniform distributed load per unit length along the string-like member such as its own weight when the string-like member is hung is applied, and on the horizontal surface like the string-like member supporting the suspension bridge. On the other hand, the shape differs depending on when a load with equal distribution is applied. The former is a catenary as shown in FIG. 13 and the latter is a parabola as shown in FIG.

  When the ceiling is reinforced by the string-like member, the horizontal force on the ceiling surface caused by the earthquake is transmitted to the string-like member via the fastening bracket. For this reason, when an uneven distribution of force occurs, stress may concentrate on one metal fitting and the metal fitting may come off. Therefore, it is necessary to support the load evenly over the entire length of the string-like member and distribute the burden load. Further, as described above, when the load evenly distributed is supported by the tensile force of the string-like member, it is most natural to draw a parabola in the shape (FIG. 14).

  As shown in Fig. 15 and (1) to (6), when considering the shape of the cable when the load of equal distribution is naturally supported in the horizontal direction, the parabola shape supports the load of equal distribution in the horizontal direction. doing.

  From the balance in the x direction, the following equations (1) and (2) are established. H represents a horizontal tension component (horizontal reaction force H), which is a constant value. T indicates the axial tension of the wire 5.

（Ｈは、水平方向張力成分を示し、一定値） From the balance in the x direction,

(H represents the horizontal tension component and is a constant value)

  From the balance in the y direction, equations (3) to (6) are established. Therefore, it turns out that the wire 5 should arrange | position in a parabolic shape. In addition, q shows the y direction equal distribution load (the horizontal distribution force H and the equal distribution load supported).

よって、放物線となる。

Therefore, it becomes a parabola.

  For example, as shown in FIG. 16, the parabola that intersects the pillars at an angle of 45 ° at the pillars at both ends of the span of the room (space), the sag depth S is the distance L between the pillars according to the equations (7) to (10). It turns out that it becomes 1/4 of.

  Here, it is desirable that the presser fittings 10 are arranged at equal intervals in the span of the room with respect to the parabolic arrangement of the wire 5 described above. In this case, when the seismic force F in the direction perpendicular to the span of the room is received, each pressing metal fitting 10 receives a force equal to qL ′ (L ′ is a burden width per metal fitting 10). The upper limit value U / L ′ of q is determined from the horizontal allowable strength U of the metal fitting 10. On the other hand, considering the relationship of q = 2H / Ly 'when x = L / 2 from Equation (7), if q is constant, the horizontal reaction force H can be reduced as y' increases. That is, the deeper parabola has less burden on the boundary structure. Further, from the equation (2), the upper limit value of the tension T can be obtained by substituting the upper limit value of q from T = 2q / (2sin θ) from q = 2T / Lsinθ.

（８）は、水平反力Ｈと支えている等分布荷重の関係を示す。
（１０）より、サグがＬ／４。 When x = L / 2 and y ′ = 1,

(8) shows the relationship between the horizontal reaction force H and the uniformly distributed load that is supported.
From (10), the sag is L / 4.

  Here, for example, in a linear arrangement, as shown in FIG. 17A, most of the load is borne only by the cables at both ends. On the other hand, as shown in FIG. 17 (b), in the case of a parabolic shape, since the cable is supported uniformly over the entire length of the cable, the burden load on the ceiling can be reduced evenly, which is a favorable situation as a reinforcement support situation of the ceiling against an earthquake load. .

  When the ceiling is reinforced with a straight cable, the cable located inside the brackets at both ends is subjected to an axial force in the direction perpendicular to the seismic force, so almost no load is applied to the brackets at that part ( FIG. 17 (a)). Therefore, most of the load for suppressing the horizontal behavior of the ceiling is borne by the metal fittings at both ends. If the metal parts are removed due to the concentration of the load on some metal parts, the metal parts may be removed one after another in a chain. When the bracket is removed, the reinforcing effect of the cable is lost, and there is a possibility of damage due to the fall of the bracket. This must be avoided.

  On the other hand, since the cables are arranged in a parabolic shape, they are uniformly supported over the entire length of the cable, so that the burden load of each metal fitting can be evenly distributed (FIG. 17B). This also makes it possible to calculate the number of brackets because the horizontal load capacity of the bracket is less than the horizontal bearing strength with respect to the input horizontal force by clarifying the horizontal bearing strength of the bracket in advance. .

  Here, the vibration characteristics of the ceiling before the reinforcement were grasped by the static loading experiment, the sweep excitation experiment, and the free vibration experiment conducted before the cable reinforcement. After that, sweep excitation experiment and free vibration experiment were conducted on the ceiling reinforced with cable using the cable introduction tension as a parameter. In the following, the relationship between the introduced tension and the maximum response displacement obtained from the sweep excitation experiment will be discussed.

FIG. 18 shows that the string-like member 5 is provided as a parabola, the seismic force acting on the ceiling finishing material 4 during an earthquake, the tension T applied to both ends of the wire 5 that bears this seismic force, and the string It is explanatory drawing which shows the relationship between the magnitude of the component force V of the perpendicular direction to the line which connects between the both ends of the wire 5 in each edge part of the shaped member 5, and the component force H along the said line direction.
The formula indicating the parabolic shape of the string-like member 5 is expressed by the following formula (11).

y = ax ² (11)
When the equation (11) is differentiated, the equation (12) is obtained.

y ′ = 2ax (12)
Since the value of a in equation (12) is x = L / 2 and y = D (D is the size of the sag), equation (13) is obtained.

^{D = a · (L / 2} ) 2 = aL 2/4 ... (13)
∴a = 4D / L ²
Here, the force acting on the wire 5 is calculated.
When the magnitude of the force to be borne by the unit length of the ceiling portion borne by the wire 5 is ρ and the acceleration at the time of the earthquake is α, the equation (14) is obtained.

V = α · ρ · L / 2 (14)
This equation can be equivalent to V = y ′ (x = L / 2) · H, and the following equations (15) and (16) are obtained.

H = V / (y ′ (x = L / 2)) = (α · ρ · L / 2) (1 / (2a / (L / 2))
= Αρ / 2a = αρL ² / 8D (15)

T = (V ² + H ² ) ^1/2 = ((α · ρ · L / 4) ² + (αρL ² / 8D) ² ) ^1/2 (16)

  FIG. 19 shows the initial tension T applied to the wire 5, the initial tension T transmitted to the wire 5, the direction change of the initial tension T acting on each press fitting 10, and the component force V of the initial tension T changed in this direction. It is explanatory drawing which shows the change of the magnitude | size of H. V, H, and T are obtained by the above formulas (14) to (16). The elastic rigidity is generated when the wire expands and contracts, and is improved by increasing the Young's modulus and cross-sectional area of the wire. The horizontal component force H is axisymmetric and cancels out, and the vertical component force V increases as it moves in the y direction. As a result, the durability in the vertical direction is improved. Further, considering geometric rigidity, it is improved by applying an initial tension T, and occurs when the wire is displaced in a direction different from the expansion and contraction direction.

Finally, reference is made to the possibilities of other embodiments of the invention. In addition, the same code | symbol is attached | subjected to the member similar to the above-mentioned embodiment.
The shape, direction, number, and the like of the parabola described above are not limited to the above-described embodiments. For example, as shown in FIG. 20, various combinations are possible. The arrangement shapes listed in FIG. 20 are only examples of variations, and are appropriately selected according to the ceiling structure, dimensions, and the like. Moreover, as shown in FIG. 21, it is also possible to combine the thing of another arrangement shape with the arrangement of a parabola shape. Further, for example, as shown in FIG. 22, an arrangement in which a parabola formed by a wire whose end is fixed on the ceiling long side and a parabola formed by a wire whose end is fixed on the short side of the ceiling intersect (a substantially lattice shape) ) Is also possible. In this way, all combinations (superposition) of parabolas are possible. In addition, in FIG. 20-22, symbol (circle) shows the position of structural enclosures, such as a pillar.

  When the plane shape of the ceiling is asymmetrical, there is an asymmetrical wire shape in which a parabola is converted to balance the asymmetrical in-plane load. The same effect as in the case can be obtained.

  In the above embodiment, a laminate made of gypsum board (PB) 41 and rock wool sound absorbing plate 42 is used for the ceiling finishing material 4. However, the material and structure of the ceiling finishing material is not limited to this.

  In the said embodiment, although the diameter of the wire 5 was set to (phi) 6, it is not restricted to this. Moreover, although the wire 5 is used as a string-like member, what is necessary is just provided with tensile and compressive strength, such as a rope and a rope.

  In the said embodiment, the depth (sag depth S) of the curved part was made into 1/4 of the distance between housings. However, when the shape approximates a straight line, the above effect becomes thin. On the other hand, the upper limit only needs to be within the ceiling material 4.

  In the above embodiment, it is not always necessary to apply tension to the wire 5. When it is arranged without applying tension, stress is generated at the end of the wire only during an earthquake, resulting in a short-term load in design, and a load up to 1.5 times the long-term load can be borne.

  When the string-like member 5 is stretched between the structural housings 6 with the slack removed, a tension of about 100 N is applied, for example.

  When the initial tension is applied to the string-like member 5, it is desirable to apply an initial tension of about 100 to 300N from the results of FIGS. Furthermore, you may add 300-1000N. However, these numerical values are based on the result of using a ceiling portion in which the span of the wire 5 extending portion is 9 m and the span of the ceiling is 6 m. If the ceiling span is widened, it is expected that the ceiling span and the initial tension are directly proportional to each other or proportional to the square of the ceiling span. The proportional relationship varies depending on the pitch at which the wires are provided and the number of hardware in the direction orthogonal to the ceiling span.

According to the configuration of the present invention, large shaking (displacement) of the ceiling can be prevented. Therefore, the natural frequency of the ceiling becomes a higher value. In addition, it has a suppressing effect on the direction in which the acceleration due to displacement increases. On the other hand, in terms of shape, the direction of symmetry of the parabola that stretches the wire has the highest suppression effect.
From these effects, it is desirable that the parabolic symmetry axis X is oriented in the maximum displacement direction Xd1 or the maximum acceleration direction Xd2, as shown in FIG. The maximum displacement direction Xd1 and the maximum acceleration direction Xd2 may be the same or different.

  Moreover, in the said embodiment, the ceiling was demonstrated to the example as a planar structure. However, the installation direction of the planar structure is not limited to the horizontal direction, and may be a vertical direction. For example, the planar structure can be applied to a wall surface as a planar structure. Furthermore, the present invention can also be applied to a ceiling with an oblique gradient as shown in FIG.

  In the said embodiment, the both ends of the wire 5 were fixed to the pillar 6 as a structural housing. However, the present invention is not limited to the above embodiment, and may be fixed to a structure such as a beam or a wall in addition to the pillar 6.

  The present invention can be used, for example, as a seismic reinforcement method for a suspended ceiling and a seismic reinforcement structure for a suspended ceiling. Moreover, it can utilize also as a reinforcement structure and reinforcement method of finishing materials of large areas other than a ceiling, and can also apply to a wall surface. Furthermore, the present method and structure have excellent durability against long-period earthquakes, but are effective not only for earthquake resistance but also for normal gravity.

1: Reinforcement structure, 2: Field edge receiver, 3: Field edge, 4: Ceiling finishing material (planar structure), 4a: Lower surface (space side surface), 5: Wire (string-shaped member), 6: Column ( (Structural housing) 10: Presser bracket, 11: Flat part, 12: Recessed part, 13: Screw (fixing member), 14: Through hole, 15: Rubber plate (buffer material), 41: Gypsum board (plaster board, PB) 42: Rock wool sound absorbing board, 50: connecting member, 51: turn buckle, 52: damper, 53: connecting member, 53a: griple, 53b: thimble, 60: fixed hardware, 61: mounting plate, 62: bolt, F : Seismic force

Claims (9)

A reinforcing structure of a planar structure that reinforces a planar structure that is provided via a structural housing and forms a space inside,
The planar structure is a ceiling finishing material provided on a ceiling base material supported by a suspension material on a ceiling slab,
The space is an indoor space formed in a lower part of the ceiling finishing material,
A string-like member whose end is connected to the structural housing;
A fixing member fixed to the surface of the ceiling finishing material on the indoor space side and holding the string-like member on the surface of the ceiling finishing material;
The string-like member is placed on the surface via the holding member and arranged in a non-linear shape, and the string-like member is held by the holding member so as to be slidable in the axial direction of the string-like member,
A reinforcing structure of a planar structure that distributes a load of a horizontal force acting on the ceiling finishing material to the holding member during an earthquake. The reinforcing structure for a planar structure according to claim 1, wherein the string-like member is stretched between the structural housings in a state where slack is removed. The reinforcing structure for a planar structure according to claim 1, wherein an initial tension is applied to the string-like member. The reinforcing structure for a planar structure according to claim 1, wherein the non-linear shape is a parabolic shape. The reinforcing structure for a planar structure according to claim 4, wherein a sag depth of the string-like member is 1/4 of a distance between the structural housings. The reinforcing structure for a planar structure according to any one of claims 1 to 5, wherein a plurality of the holding members are provided at equal intervals. The reinforcing structure for a planar structure according to any one of claims 1 to 6, wherein the holding member has a recess for receiving the string-like member at the center of the surface of the planar structure that is in close contact with the surface. . The reinforcing structure for a planar structure according to any one of claims 1 to 7, wherein the structural casing is a pillar. A method of reinforcing a planar structure that reinforces a planar structure that is provided via a structural housing and forms a space inside,
The planar structure is a ceiling finishing material provided on a ceiling base material supported by a suspension material on a ceiling slab,
The space is an indoor space formed in a lower part of the ceiling finishing material,
A holding member is fixed to the surface of the ceiling finishing material on the indoor space side, and a string-like member is arranged in a non-linear shape over the surface via the holding member, and the end of the string-like member is Connected to the structural frame, the string-like member is held by the holding member so as to be slidable in the axial direction of the string-like member, and the load of horizontal force acting on the ceiling finishing material in the event of an earthquake is distributed to the holding member A method for reinforcing a planar structure.

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