JP6237061B2 - Joint base material - Google Patents

Description

  The present invention relates to a joint base material that covers a joint of an interior finishing material.

  In order to increase the fire resistance of the steel structure, it is possible to use a fire-resistant coating method or fire-resistant steel. However, these techniques have problems such as poor construction environment and high cost. Therefore, as a technique for ensuring fire resistance at low cost, a membrane fire resistance technique using an interior finishing material as a heat shield is known. In the membrane fireproof technology, a support member that supports the interior finishing material (for example, called a field edge in the case of the ceiling) is extended to the back side of the joint part of the interior finishing material, and used as a base material covering the joint part. Is common. By arranging the base material, it is possible to prevent heat from entering the back side of the interior finishing material even if a gap is generated in the joint portion during a fire.

  However, generally, the joints of the interior finishing material exist in two directions, for example, vertically and horizontally. Nevertheless, in order to facilitate construction, the support members are often only extended in one direction parallel to each other (one-way through). Therefore, the joint portion in the direction intersecting with the support member, which is present in the interior finishing material, is not covered with the base material, and is often in an unprotected state against the occurrence of a gap during a fire. On the other hand, Patent Document 1 describes a technique in which a T-shaped steel joiner is disposed at a joint portion in a direction perpendicular to the field edge of the ceiling interior finishing material and used as a base material.

Japanese Patent No. 3474400

  However, the T-shaped steel joiner (underlying material) described in Patent Document 1 is sandwiched between the interior finishing material and the field edge, and is fixed to the field edge with screws that penetrate from the front side to the field edge of the interior finishing material. Is done. In the case of such a structure, the base material has to be attached in a state where the interior finishing material is removed from the field edge, and there is a problem that it is not always easy to construct the base material.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to improve the heat shielding performance of the joint portion of the interior finishing material that intersects the support member with simple construction. It is an object of the present invention to provide a new and improved joint base material.

In order to solve the above-described problem, according to one aspect of the present invention, a first joint running in the first direction and a second joint running in the second direction intersecting the first direction are provided. An interior finishing material, and a plurality of support members that extend in parallel to each other in the first direction and are coupled to the back surface of the interior finishing material to support the interior finishing material and at least partially cover the first joint. In the interior structure including the first and second support members adjacent to each other among the plurality of support members, the joint base material is disposed along the back surface of the interior finish material. The flat surface covering the joint portion of the flat plate and both ends of the flat surface rise along the side surfaces of the first and second support members, respectively, and the joint portion base material is fixed to the first and second support members. It includes a rising surface of the pair and to the flat Plane, in synchronization with the thermal deformation of the interior finish, joints underlying material is deformable in close contact with the interior finish is provided.

  In the joint base material, the flat surface and the pair of rising surfaces may be formed of a steel plate. The steel plate may be a thin steel plate. The width of the flat surface with respect to the second direction may be 10 mm or more. The joint base material further includes a pair of wraparound surfaces formed by wrapping each end of the pair of rising surfaces along the first or second support member. The joint base material is fixed to the first and second support members by fitting the first or second support members inside the groove shapes respectively formed by the rising surface and the pair of wraparound surfaces. Also good. In the joint base material, the pair of rising surfaces may be fastened to the side surfaces of the first or second support member by fastening means.

  The joint base material has a rising surface that rises along the side surface of the support member, and the rising surface fits inside the groove that forms the wraparound surface, or the rising surface is the support member. It is fixed to the support member by being fastened to the side surface of the. Therefore, for example, compared to a joint material that is sandwiched between the interior finish material and the support member, the joint material is similarly covered to improve the heat shielding performance of the joint, but the construction is more It is simple.

  As described above, according to the present invention, it is possible to improve the heat shielding performance of the joint portion of the interior finishing material that intersects the support member with a simple construction.

It is a perspective view of the ceiling structure in which the joint part base material which concerns on one Embodiment of this invention is installed. It is a figure for demonstrating the position of the joint part of the interior finishing material in the ceiling structure shown in FIG. It is a perspective view of the joint part base material which concerns on one Embodiment of this invention. It is a figure which shows the state by which the joint part base material shown in FIG. 3 was arrange | positioned at the ceiling structure. It is sectional drawing of the attachment structure of the joint part base material shown in FIG. It is sectional drawing of the attachment structure of the joint part base material which concerns on other embodiment of this invention. It is sectional drawing of the attachment structure of the joint part base material which concerns on other embodiment of this invention. It is sectional drawing of the attachment structure of the joint part base material which concerns on other embodiment of this invention. It is a figure for demonstrating the outline | summary of the heating test implemented prior to the heat conduction analysis. 10 is a graph for explaining the conversion of the joint width in the heat test shown in FIG. 9 into a gap area in the heat conduction analysis. It is a graph which shows a heat conduction analysis result at the time of setting a maximum clearance area to 7.50%. It is a graph which shows a heat conduction analysis result at the time of setting a maximum gap area to 0.75%. It is a graph which compares the heat conduction analysis result for every maximum clearance area about the lower surface temperature of a floor. It is a graph which shows the result of the thermal deformation analysis about the thickness of a joint part base material.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(1. Ceiling structure)
First, with reference to FIG. 1 and FIG. 2, the ceiling structure in which the joint base material which concerns on one Embodiment of this invention is installed is demonstrated. FIG. 1 is a perspective view of a ceiling structure. FIG. 2 is a diagram for explaining the positions of joint portions of the interior finishing material in the ceiling structure shown in FIG. As shown in FIG. 1, the ceiling structure 1 includes a ceiling finishing material 2, a field edge 3, a field edge receiver 4, a floor 5, and a suspension member 6.

  The ceiling finishing material 2 is an example of the interior finishing material in the present embodiment. In the ceiling structure 1, since the membrane fireproof technology is adopted, the ceiling finishing material 2 has a heat shielding property. Moreover, the ceiling finishing material 2 is divided into rectangles having a predetermined size in order to improve workability. Therefore, the ceiling finishing material 2 has joint portions 21 at the boundaries of the divided rectangles. As shown in FIG. 2, the joint portion 21 includes a joint portion 21a that runs in the first direction (x-axis direction in the drawing) and a second direction that intersects the first direction (y-axis direction in the drawing). ) Running joint part 21b.

  The field edge 3 is an example of a support member in the present embodiment. The field edge 3 is coupled to the back side of the ceiling finishing material 2 using screws or the like to support the ceiling finishing material 2. In the present specification, the side where the ceiling finishing material 2 constitutes the ceiling surface will be described as the front side, and the side where the field edge 3 is joined to the ceiling finishing material 2 will be described as the back side. In the present embodiment, a plurality of field edges 3 are extended in parallel with each other in a first direction (x-axis direction in the drawing).

  Here, the field edge 3 includes a wide field edge 3a disposed along the joint part 21a, and a narrow field edge 3b disposed between the wide field edges 3a at a position without the joint part 21a. The wide field edge 3a and the narrow field edge 3b are both formed by cold forming a thin steel plate, for example, and may have a common cross-sectional shape (in the illustrated example, both are lip channel steel) Is). Alternatively, the wide field edge 3a and the narrow field edge 3b may have different cross-sectional shapes. Since the wide field edge 3a is coupled to the ceiling finishing material 2 on both sides of the joint portion 21a, the wide field edge 3a has a wider width than the narrow field edge 3b. The field edge 3 does not necessarily include the wide field edge 3a and the narrow field edge 3b. For example, for the purpose of facilitating material procurement, the width, height, plate thickness, and the like may be common to all the field edges 3.

  The field edge receiver 4 extends in a second direction (y-axis direction in the drawing) intersecting the field edge 3 and is coupled to each of the field edges 3 using a clip or the like to support the field edge 3. The field edge receiver 4 is suspended by a suspension member 6 from the floor 5 of the upper floor. With such a structure, the ceiling finishing material 2 is supported in a state where a ceiling back space having a predetermined height is formed between the ceiling finishing material 2 and the floor 5 of the upper floor.

  In such a ceiling structure 1, in order to minimize the influence on the upper floor at the time of a fire on the lower floor, it is necessary to suppress the heat intrusion into the space behind the ceiling and suppress the temperature rise of the floor 5. It is. Although the ceiling finishing material 2 itself has a heat shielding property, a gap is generated in the joint portion 21 due to contraction of the ceiling finishing material 2 due to heat in the event of a fire. Here, with respect to the joint portion 21a running in the first direction (x-axis direction in the drawing), the wide field edge 3a functions as a base material. That is, since the gap generated in the joint portion 21a at the time of a fire is covered by the wide field edge 2a, intrusion of heat from the gap into the ceiling space is suppressed. On the other hand, in the state shown in FIG. 2, the joint portion 21b running in the second direction (y-axis direction in the figure) has no base material. In this state, if a gap occurs in the joint portion 21b at the time of a fire, heat cannot be prevented from entering the ceiling space from the gap. In addition, the clearance gap between the joint parts 21b is generated not only by the contraction of the ceiling finishing material 2 due to heat but also by the joint part 21b being expanded by the field edge 3 that is bent toward the ceiling finishing material 2 due to heat. .

  Therefore, in the present embodiment, by separately providing a joint base material for covering the joint portion 21b, intrusion of heat from the gap generated in the joint portion 21b during a fire into the ceiling space is suppressed. Hereinafter, the joint base material will be further described.

(2. Structure of joint base material)
The structure of the joint base material according to the embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a perspective view of the joint base material. FIG. 4 is a view showing a state in which the joint base material shown in FIG. 3 is arranged in the ceiling structure. FIG. 5 is a cross-sectional view of the joint base material mounting structure shown in FIG. As shown in FIG. 3, the joint base material 10 includes a flat surface 11, a pair of rising surfaces 12, and a pair of wraparound surfaces 13.

  The flat surface 11 is arrange | positioned along the back surface of the ceiling finishing material 2, and covers the joint part 21b. The flat surface 11 has a sufficient width to cover the gap generated in the joint portion 21b during a fire. Although this width depends on the size of the ceiling finishing material 2, for example, if it is 10 mm or more, the gap generated in the joint portion 21 b in many cases can be covered. Further, as will be described later, the flat surface 11 is desirably deformed in synchronism with the deformation amount of the ceiling finishing material 2 due to heating at the time of fire. For this purpose, when the flat surface 11 is formed of a steel plate, The thickness is desirably 3 mm or less. Therefore, for example, the joint base material 10 may be integrally formed of a thin steel plate (thickness less than 3 mm) by cold forming (roll forming or the like).

  As shown in FIG. 5, the rising surface 12 is formed by rising both ends of the flat surface 11 along the side surface 31 of the field edge 3. For example, in the example shown in FIG. 4, the joint base material 10 is installed between the wide field edge 3a (example of the first support member) and the narrow field edge 3b (example of the second support member). Therefore, one rising surface 12 rises along the side surface of the wide field edge 3a, and the other rising surface 12 rises along the side surface of the narrow field edge 3b. The rising surface 12 forms a groove shape together with the wrapping surface 13 described below, and the wide field edge 3a or the narrow field edge 3b is fitted inside the rising surface 12 to thereby form the wide field edge 3a and the narrow field edge 3b. The joint base material 10 is fixed to the surface.

  As shown in FIG. 5, the wraparound surface 13 is formed by each end portion of the rising surface 12 wrapping along the field edge 3. In the illustrated example, the wrapping surface 13 wraps around the lip surface 32 of the narrow field edge 3b made of lip channel steel, and the inside of the narrow field edge 3b from the end of the lip surface 32 And a side portion 13b. A portion including the side surface 31 and the lip surface 32 of the narrow field edge 3b is fitted inside the groove formed by the top portion 13a and the side portion 13b of the wraparound surface 13 and the rising surface 12, whereby a joint is obtained. The partial base material 10 is fixed to the narrow field edge 3b. Since the narrow field edge 3b is fixed to the ceiling finishing material 2 with screws 7, the joint base material 10 is fixed to the ceiling finishing material 2 via the narrow field edge 3b. Accordingly, the joint base material 10 can stably cover the joint 21b. In the example shown in FIG. 4, since the wide field edge 3a is also formed of lip groove steel, the joint base material 10 is the same as in the case of the narrow field edge 3b shown in FIG. It can also be fixed to the edge 3a.

  By installing the joint base material 10 as described above, a gap generated in the joint portion 21b of the ceiling finishing material 2 at the time of a fire is covered by the flat surface 11 of the joint base material 10, and the ceiling is formed from this gap. Intrusion of heat into the back space is suppressed.

  Further, the joint base material 10 is different from, for example, a type that is sandwiched and fixed between the ceiling finishing material 2 and the field edge 3, for example, the ceiling finishing material 2 and the field edge 3 are once fixed by screws 7. Even after this, it is possible to construct without removing the edge 3 from the ceiling finishing material 2. Therefore, the joint base material 10 is, for example, newly added to the already constructed ceiling structure 1 to construct the joint base material, or the joint base material already constructed on the ceiling structure 1 is replaced for some reason. It is advantageous when doing so.

(3. Modification of mounting structure)
Subsequently, with reference to FIGS. 6 to 8, a joint structure for a joint base material according to another embodiment of the present invention will be described. 6-8 is sectional drawing of the attachment structure of the joint part base material which concerns on other embodiment of this invention.

  In the example shown in FIG. 6, the joint base material 10 is attached to a narrow-width field edge 3 c made of a horizontally placed lip groove steel. In this example, the joint portion base material 10 has a narrow width by fitting the narrow field edge 3 c as a whole inside the groove formed by the rising surface 12 and the wraparound surface 13 of the joint portion base material 10. It is fixed to the field edge 3c. That is, in the illustrated example, the rising surface 12 rises along the side surface 33 (the bottom surface of the lip groove steel) of the narrow field edge 3c, and the top portion 13a of the wraparound surface 13 is the top surface 34 of the narrow field edge 3c ( The side portion 13b wraps around the upper side of the side surface 35 opposite to the narrow field edge 3c (the portion including the lip surface of the lip channel steel).

  Note that the joint structure of the joint base material 10 is the same as that of the example shown in FIG. 6 even when the wide field edge 3a is formed of lip channel steel that is placed horizontally. In addition, when the field edge 3 is formed of, for example, a square steel, a lip Z-shaped steel, a lip groove-shaped steel that is placed horizontally, or the like, the rising surface 12 and the wrap-around surface 13 are similar to the above example. The joint portion base material 10 can be fixed to the field edge 3 by fitting the field edge 3 as a whole inside the groove shape to be formed.

  In the example of FIG. 6 described above, the attachment portions of the joint base materials 10L and 10R installed on both sides of the narrow field edge 3c interfere on the narrow field edge 3c. In each joint base material 10, the dimensions of the rising surface 12 and the wraparound surface 13 are adjusted. For example, in the joint base material 10L, the dimensions of the rising surface 12 and the wraparound surface 13 surround the rising surface 12 and the wraparound surface 13 of the joint base material 10R that surrounds the outer periphery of the narrow field edge 3c from the outside. Set to

  In the example shown in FIG. 7, the joint base material 10 is fixed to a narrow field edge 3 b made of a lip groove steel, as in the example shown in FIG. 5. Further, in this example, the rising surface 12 of the joint base material 10 and the side surface 31 of the narrow field edge 3 b are fastened by the screws 8. The screw 8 is an example of a fastening unit, and a bolt or a rivet may be used as the fastening unit. In this case, for example, when a force acts in a first direction (x-axis direction in the drawing) that intersects the second direction (y-axis direction in the drawing) in which the joint base material 10 extends due to, for example, an earthquake However, it is prevented that the joint base material 10 is displaced from the original installation position and does not cover the joint 21b. Similarly to the other examples described above, the joint base material 10 can be fixed to the wide field edge 3a in the same manner using the fastening means.

  When the rising surface 12 and the side surface of the field edge 3 are fastened by fastening means as in the above example, the field edge 3 is fitted inside the groove formed by the rising surface 12 and the wraparound surface 13. The joint base material 10 can be fixed to the field edge 3 regardless of the condition. Therefore, for example, the joint base material 10 may be configured by the flat surface 11 and the rising surface 12 without providing the wraparound surface 13 as in the example shown in FIG. 8. In this case, the rising surface 12 only needs to have a sufficient area to be fastened by the side surface 31 of the narrow field edge 3b and the screw 8, and as in the example shown in FIG. The upper end may not be reached.

(4. Results of heat conduction analysis)
Next, with reference to FIG. 9 to FIG. 14, the result of the heat conduction analysis performed by the present inventors will be described in order to verify the effect of the joint base material according to the embodiment of the present invention. In the heat conduction analysis, the gap area generated in the ceiling material was set based on the result of the heating test performed in advance, and then the analysis was performed for the case where the joint base material was not installed.

  FIG. 9 is a diagram for explaining the outline of the heating test performed prior to the heat conduction analysis. In the test, in the ceiling structure 1 as shown in FIG. 1, heat assumed at the time of a fire is applied from the surface side of the ceiling finishing material 2, and the upper surface (P1) of the floor 5, the lower surface (P2) of the floor 5, and the floor 5 The temperature of the center of the ceiling back space (P3) between the ceiling finishing material 2 and the top surface (P4) of the ceiling finishing material 2 was measured. Note that similar temperature measurement points P <b> 1 to P <b> 4 are set in the heat conduction analysis described later. The distance from the ceiling finishing material 2 to the lower surface of the floor 5, that is, the height of the space behind the ceiling is 1000 mm. The ceiling finishing material 2 is provided with a joint portion 21. The ceiling finishing material 2 has a heat shielding performance, but shrinks when the temperature rises. Therefore, a gap having a width d is generated in the joint portion 21 due to heating, and the width d of the gap increases as the temperature of the ceiling finishing material 2 increases. Enlarged.

  FIG. 10 is a graph for explaining the conversion of the joint width to the gap area in the heat conduction analysis in the heating test shown in FIG. 9. As described above, in the heating test, a gap having a width d occurred in the joint portion 21 of the ceiling finishing material 2 due to heating. In the heat conduction analysis, this gap was converted into a ratio of the gap area to the entire area of the ceiling finishing material 2. When the result of the heat conduction analysis performed by changing the ratio of the gap area and the result of the above heating test were compared, the gap area (maximum) when the average temperature (P4) of the ceiling finishing material 2 reached 1000 ° C. When the gap area was 7.50%, the temperature analysis values at the temperature measurement points P1 to P4 in the heat conduction analysis matched well with the temperature experimental values at the temperature measurement points P1 to P4 in the heating test.

  Therefore, in the following heat conduction analysis, when the joint base material is not disposed, the ceiling finishing material 2 contracts due to the evaporation of moisture in the ceiling finishing material 2 after the average temperature of the ceiling finishing material 2 reaches 100 ° C. Therefore, a gap area is generated (until 0% until then), and then the ratio of the gap area increases to 7.50% of the entire ceiling finishing material 2 until the average temperature of the ceiling finishing material 2 reaches 1000 ° C. It was supposed to be. Further, in the heat conduction analysis, as a reproduction of the state when the joint base material 10 is arranged, the gap of the joint portion 21 is covered by the joint base material 2, so that the maximum clearance area of the ceiling finishing material 2 is increased. The analysis was performed for a case where it decreased to 0.75%.

  FIG. 11 is a graph showing the result of heat conduction analysis when the maximum gap area is set to 7.50%. FIG. 12 is a graph showing a heat conduction analysis result when the maximum gap area is set to 0.75%. Comparing these graphs, P1 (top surface temperature of the floor 5), P2 (bottom surface temperature of the floor 5), P3 (temperature in the center of the ceiling space), and P4 (top surface temperature of the ceiling finishing material 2) It can be seen that the temperature decreases as the maximum gap area decreases. In particular, for P2 (the temperature of the lower surface of the floor 5) and P3 (the temperature at the center of the ceiling space), the temperature drop is remarkable (P2 is about 200 ° C. and P3 is about 500 as compared at the time 120 minutes later). It can be seen that suppressing the gap area at the joint portion 21 by installing the joint base material 10 is effective for preventing heat from entering the ceiling space.

  FIG. 13 is a graph comparing the heat conduction analysis results for each maximum gap area with respect to the bottom surface temperature of the floor. In addition to the cases of the maximum gap areas of 7.50% and 0.75% shown in FIGS. 11 and 12, the heat conduction analysis was performed for the case of the maximum gap area of 3.75%. The results shown were obtained. As shown in the figure, the lower surface temperature (P2) of the floor 5 decreases as the maximum gap area decreases. In the analysis result shown in the figure, P2 after 120 minutes exceeds 300 ° C. when the maximum gap area is 7.50%, whereas P2 after 120 minutes is 100 when the maximum gap area is 0.75%. It is over about ℃ and is suppressed to about half or less.

  From the results of the heat conduction analysis described above, the installation of the joint base material 10 is effective for suppressing the heat intrusion from the joint part 21 to the ceiling space during a fire and suppressing the temperature rise of the floor 5. It was confirmed that.

(5. Study on thickness of joint base material)
Then, with reference to FIG. 14, the examination result regarding the thickness of the joint part base material which concerns on one Embodiment of this invention is demonstrated. FIG. 14 is a graph showing the result of thermal deformation analysis for the thickness of the joint base material.

  In the event of a fire, large heat is applied from the front side of the ceiling finishing material 2. Since the ceiling finishing material 2 has a heat shielding property, intrusion of heat into the ceiling space on the back side is prevented, but the strength and rigidity of the ceiling finishing material 2 itself are lowered when the surface is heated. Therefore, the ceiling finishing material 2 is easily bent by its own weight. Moreover, when the temperature on the front side of the ceiling finishing material 2 becomes higher than that on the back side, the ceiling finishing material 2 warps little by little toward the front side.

  At this time, if the amount of deflection deformation of the flat surface 11 that is arranged along the back surface of the ceiling finishing material 2 and covers the joint portion 21b is smaller than the amount of deflection deformation of the ceiling finishing material 2, the joint portion base material 10 becomes the ceiling. It floats from the finishing material 2, and the gap generated in the joint portion 21b is not covered. Therefore, it is desirable that the joint base material 10 has a deflection amount equivalent to or higher than that of the ceiling finishing material 2 on the flat surface 11.

  In order to specify the thickness of the joint base material 10 that satisfies the above conditions, the present inventors use a 1500 mm long steel plate with both ends fixed, and when the thickness t is 3 mm and 5 mm. Then, the thermal deformation analysis according to the ISO834 standard heating curve was performed, and the deflection amount in the vertical direction was examined. As a result, the amount of deformation was larger when the thickness t was 3 mm, and reached about 1.6 mm 30 minutes after the start of heating. On the other hand, when the thickness t was 5 mm, the deformation after 30 minutes was about 0.8 mm. From this result, it can be said that the smaller the thickness t of the steel sheet, the larger the amount of deformation due to the lower rigidity of the steel sheet after heating.

  Here, the amount of deformation of the ceiling finishing material 2 with respect to heating under the same conditions was about 1.0 mm after 30 minutes. Therefore, when the thickness t of the steel sheet is 5 mm, the amount of deformation of the flat surface 11 of the joint base material 10 is smaller than the amount of deformation of the ceiling finishing material 2, that is, the flat surface 11 is from the ceiling finishing material 2. It will float. On the other hand, when the thickness t is 3 mm, the amount of deformation of the flat surface 11 of the joint base material 10 is larger than the amount of deformation of the ceiling finishing material 2. In this case, since the flat surface 11 is pressed against the ceiling finishing material 2, the actual deflection amount of the flat surface 11 is synchronized with the deflection amount of the ceiling finishing material 2, that is, the ceiling finishing material 2 and the flat surface. 11 is deformed while maintaining a close contact state. Accordingly, even if the ceiling finishing material 2 is deformed by heating, the flat surface 11 can continue to cover the gap generated in the joint portion 21b.

  From the above, when the flat surface 11 of the joint base material 10 is formed of a steel plate, it can be said that the thickness is preferably 3 mm or less (as can be seen from the result of the thermal deformation analysis shown in FIG. May be slightly thicker than 3 mm). Therefore, for example, the flat surface 11 of the joint base material 10 is formed of a thin steel plate (usually less than 3 mm in thickness) or formed of a steel plate having a thickness of about 3 mm even if not a thin steel plate. Is desirable.

  In the above embodiment, the steel plate is exemplified as a material capable of forming the flat surface 11 having the same amount of deformation as the ceiling finishing material 2 or larger than the ceiling finishing material 2, but the embodiment of the present invention is not limited to this. It is not restricted to such an example. In addition to the steel plate, any material that can bend and deform by heat, such as another metal material, can be used as the material for forming the flat surface 11 or the joint base material 10 as a whole.

  Further, in the above embodiment, the case where the joint base material 10 is installed in the ceiling structure 1 has been described by exemplifying the ceiling finishing material 2 as the interior finishing material and the field edge 3 as the support member. The embodiment of the present invention is not limited to such an example. For example, the joint base material 10 may be installed on a wall surface structure. In this case, the interior finishing material may be a wall finishing material, and the support member may be a frame coupled to the back side of the wall finishing material.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Ceiling structure 2 Ceiling finishing material 3 Field edge 3a Wide width edge 3b, 3c Narrow width edge 4 Field edge receiving 5 Floor surface 10 Joint part base material 11 Flat surface 12 Standing surface 13 Round surface 13a Top part 13b Side part

Claims (6)

An interior finishing material having a first joint running in a first direction and a second joint running in a second direction intersecting the first direction, and extending in the first direction parallel to each other And an interior structure including a plurality of support members coupled to the back surface of the interior finish material to support the interior finish material and at least a part of which covers the first joint portion. A joint base material installed between the first and second support members adjacent to each other,
A flat surface disposed along the back surface of the interior finishing material and covering the second joint portion;
A pair of both ends of the flat surface is formed by rising along side surfaces of the first and second support members, respectively, and fixes the joint base material to the first and second support members. and a rising surface,
The flat surface can be deformed in close contact with the interior finishing material in synchronization with thermal deformation of the interior finishing material.
Joint base material.   The joint base material according to claim 1, wherein the flat surface and the pair of rising surfaces are formed of a steel plate.   The joint base material according to claim 2, wherein the steel plate is a thin steel plate.   The joint base material according to any one of claims 1 to 3, wherein a width of the flat surface with respect to the second direction is 10 mm or more. A pair of wraparound surfaces formed by wrapping each end of the pair of rising surfaces along the first or second support member;
The first and second support members are formed by fitting the first or second support member inside the groove formed by the pair of rising surfaces and the pair of wraparound surfaces. The joint part base material according to claim 1, wherein the joint part base material is fixed to the joint part base material.   The joint base material according to any one of claims 1 to 5, wherein the pair of rising surfaces are fastened to side surfaces of the first or second support member by fastening means, respectively.

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