JP2018150753A - How to demolish a building roof - Google Patents

Abstract

The present invention provides a method for demolishing a roof of a building that can suppress an increase in the amount of work and cost even in the dismantling work of a larger-scale roof structure in safety measures for the dismantling work. A building 1 to be demolished includes a roof structure 3 configured by combining a plurality of truss members, and a support structure 2 that receives a load in the vertical direction of the roof structure 3. The first disassembly step S1 is a step of removing the truss member included in the first disassembly target region FD formed between the virtual reference line including the second support end of the second support truss and the work side portion 7A. The first dismantling target area FD is specified not to include the first support end. The second dismantling step S2 is performed after the first dismantling step S1, and the truss member included in the second dismantling target region SD including the first support end is removed. [Selection] Figure 3

Description

  The present invention relates to a method for demolishing a roof of a building.

  In dismantling the roof structure, the structures that bear the structural load are sequentially removed. Therefore, since the state of the structure tends to become unstable, safety measures are taken so that the structure can be disassembled stably. For example, there is a method of constructing a temporary structure below the roof structure and proceeding with the disassembly while supporting the load of the roof structure with the temporary structure.

Japanese Patent Laid-Open No. 11-44104

  However, when temporary structures are used, time and cost increase for constructing them. Therefore, Patent Document 1 discloses a dome roof disassembly method for dismantling the dome roof safely without using a temporary structure.

  In the field, dismantling work of a larger scale roof structure may be performed. In such a dismantling operation, using a temporary structure requires more time and cost. Therefore, the present invention provides a method for demolishing a roof of a building that can suppress an increase in work amount and cost even in a dismantling operation of a larger roof structure, as a safety measure for the dismantling operation.

One aspect of the present invention is a method for demolishing a roof of a building. The building includes a roof structure configured by combining a plurality of structural members, and a support structure coupled to the roof structure so as to receive a load in the vertical direction of the roof structure, and the roof structure being demolished The body includes at least one support side connected to the support structure and receiving a support force, and a work side different from the support side.
The dismantling method is formed by a structural member, and includes a first support portion including a first support end constituting a support side portion, and a structural member, and the support side portion is constituted by a first support end. And a second support portion including a second support end that is separated from the work side, wherein the first support portion and the second support portion extend in a direction away from the work side. And removing the structural member included in the first disassembly target region formed between the virtual reference line including the second support end of the second support part and the work side, wherein the first disassembly target region is The first disassembly step that does not include the first support end of the first support portion, and the second disassembly step that is performed after the first disassembly step and removes the structural member included in the second disassembly target region including the first support end. And having.

  In the dismantling method, when the structural members constituting the roof structure are removed, the diagonal truss functions as a so-called fire-fire, thereby suppressing the strength of the roof structure being dismantled. First, in the first dismantling process, the structural member is removed so as to leave the structural member in a region having a high contribution to the strength of the roof structure. Then, the roof structure is lightened by the removed structural member. When the mass of the roof structure is reduced, structural members that can be removed even if removed. Therefore, in the second dismantling process, it is possible to remove the structural member that has no problem. By repeatedly performing these steps, it is possible to proceed with the dismantling work while suppressing a decrease in strength to the roof structure. Then, it becomes possible to dismantle a larger-scale roof structure without constructing a temporary structure for supporting the roof structure being dismantled. Therefore, the amount of work and cost can be increased.

  The first disassembly step may include a step of dividing the first disassembly target region into a plurality of region portions and a step of removing the structural member for each of the plurality of region portions. According to this method, the roof structure can be easily dismantled.

  The first dismantling target region may further include a step of removing the structural member in the region portion formed between the first support portion and the work side portion. According to this method, the structural member in the vicinity of the support end is removed. When the extra structural member is removed, the load applied to the support end is reduced, so that the roof structure is further stabilized. Therefore, the dismantling work is further facilitated.

  ADVANTAGE OF THE INVENTION According to this invention, the method of demolishing the roof of the building which can advance a demolishing operation | work, keeping the state in the roof structure in the demolishing stable is provided.

FIG. 1 is a perspective view schematically showing a building to which the dismantling method according to the present embodiment is applied. Part (a) of FIG. 2 is a plan view of the roof structure shown in FIG. 1, and part (b) of FIG. 2 is a front view of the roof structure. FIG. 3 is a flowchart showing the main steps of the dismantling method according to this embodiment. 4A is a plan view showing a process of designating a support truss in the first dismantling step, and FIG. 4B is a process of designating a first dismantling target area in the first dismantling step. It is a top view which shows the process of removing the truss member of 1 dismantling object area | region. Part (a) of FIG. 5 is a plan view showing a step of designating the second dismantling target area in the first dismantling step and a step of removing the truss member in the second dismantling target area, and part (b) of FIG. These are top views which show the process of designating the support truss in a 2nd disassembly step. FIG. 6A is a plan view showing a step of designating a first dismantling target region in the second dismantling step and a step of removing the truss member in the first dismantling target region, and FIG. These are top views which show the process of designating the 2nd dismantling object area | region in a 2nd dismantling step, and the process of removing the truss member of a 2nd dismantling object area | region. Part (a) of FIG. 7 is a plan view showing the process of designating the support truss in the third dismantling step, and part (b) of FIG. 7 is the process of designating the first dismantling target area in the third dismantling step and It is a top view which shows the process of removing the truss member of 1 dismantling object area | region. FIG. 8A is a plan view showing a step of designating the second dismantling target region in the third dismantling step and a step of removing the truss member in the second dismantling target region, and FIG. These are top views which show the process of designating the support truss in a 4th dismantling step. FIG. 9A is a plan view showing a step of designating the first dismantling target area in the fourth dismantling step and a step of removing the truss member in the first dismantling target area, and FIG. These are top views which show the process of designating the 2nd dismantling object area | region in a 4th dismantling step, and the process of removing the truss member of a 2nd dismantling object area | region. Part (a) of FIG. 10 is a plan view showing a process of designating a dismantling target area in the final dismantling step, and part (b) of FIG. 10 shows a process of removing the truss member in the dismantling target area in the final dismantling step. It is a top view.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

<Roof structure>
The dismantling method according to the present embodiment is used for dismantling a building 1 having a large roof structure such as a movable roof of a stadium shown in FIG. The building 1 has a support structure 2 and a roof structure 3. The roof structure 3 is bridged between the support structures 2.

  The support structure 2 supports the load of the roof structure 3. This support means that a load loaded on the roof structure 3 such as a load in the vertical direction due to the mass of the roof structure 3 or a snow load caused by snow accumulated on the roof structure 3 is supported. Therefore, the support structure 2 may allow the roof structure 3 to move in the horizontal direction. The support structure 2 may not allow the roof structure 3 to move, and the roof structure 3 may be fixed to the support structure 2.

  The support structure 2 has a pair of wall structures 2A and 2B. The wall structures 2A and 2B extend along the X direction. One wall structure 2A is separated from the other wall structure 2B in the Y direction. The lower ends of the wall structures 2A and 2B are fixed by being embedded in the ground or the like, and extend in a substantially vertical direction with respect to the ground. The wall structures 2A and 2B are connected to the roof structure 3 on the upper end side.

  The roof structure 3 is provided so as to cover a predetermined region 4 formed between the wall structures 2A and 2B, and blocks sunlight and rain. The predetermined area 4 may include, for example, a field where various sports competitions are held, a parking area for maintaining an aircraft, and the like. In the region 4 used for such an application, a support structure such as a support column is basically not disposed, but the disassembly method according to the present embodiment is also applicable to a structure in which the support structure is disposed. .

  As described above, the roof structure 3 is stretched in an arch shape from one wall structure 2A to the other wall structure 2B. Accordingly, the roof structure 3 has an arc-shaped cross section included in the YZ plane, and has an outer shape such that the arc-shaped cross section is swept in the X direction.

  The roof structure 3 has a rectangular shape in plan view. The roof structure 3 has a support side part 6 and a free side part 7. Each of the support side portions 6 extends in the X direction. In other words, the pair of support side portions 6 extend in the same direction as the wall structures 2A and 2B. The support side 6 is connected to the wall structures 2A and 2B. Therefore, the support side 6 is a simple support end to which a support force is applied from the wall structures 2A and 2B. The pair of free side portions 7 extend in the Y direction so as to connect the pair of support side portions 6 respectively. No support structure such as the wall structures 2A and 2B is disposed between the free side portion 7 and the ground. Accordingly, the free side portion 7 is a free end to which no support force is applied from the wall structures 2A, 2B and the like due to the structure.

  As a method for dismantling the building 1, the roof structure 3 is sequentially dismantled along the X direction. For example, the dismantling work proceeds from one free side 7 toward the other free side 7. Therefore, for convenience of explanation, the disassembly of the roof structure 3 is started, the side where the disassembly is performed is called a work side 7A, and the last remaining side in the disassembly work is called the rear free side 7B. .

  The roof structure 3 is a structure having a so-called truss structure, and a roof is configured by arranging film-like members such as sheets on the truss structure. 2A is a simplified plan view looking down on the roof structure 3 from above, and FIG. 2B is a front view of the roof structure 3. Note that FIG. 2 illustrates the truss structure in the wall structures 2A and 2B and the roof structure 3, and illustration of accompanying components such as sheets is omitted.

  The truss structure has a triangular unit structure in which a plurality of truss members (a plurality of structural members) are combined. The truss structure is configured by combining a plurality of these unit structures. Therefore, when the roof structure 3 is viewed microscopically, a plurality of triangular areas can be confirmed, and a plurality of quadrangular areas can also be confirmed. On the other hand, when the roof structure 3 is viewed macroscopically, a plurality of vertical trusses 8, a plurality of lateral trusses 9, and a plurality of oblique trusses T (supporting portions) can be confirmed.

  The vertical truss 8 extends in the X direction, and is configured by connecting ends of a plurality of truss members P arranged in parallel to the X direction. Therefore, the longitudinal truss 8 has a long shape in which one end 8a is included in the working side portion 7A and the other end 8b is included in the rear free side portion 7B. The roof structure 3 has 26 vertical trusses 8. A plurality of these vertical trusses 8 are arranged at predetermined intervals in the Y direction, and adjacent vertical trusses 8 are connected to each other by a horizontal truss 9.

  The lateral truss 9 extends in the Y direction, and is configured by connecting ends of a plurality of truss members P arranged in parallel to the Y direction. Accordingly, the lateral truss 9 has a long shape in which one end 9a is included in one support side 6A and the other end 9b is included in the other support side 6B. The roof structure 3 has eleven lateral trusses 9. A plurality of horizontal trusses 9 are arranged at predetermined intervals in the X direction, and the adjacent horizontal trusses 9 are connected to each other by a vertical truss 8. The direction in which the lateral truss 9 extends is defined as the Y direction. To be precise, the direction in which the lateral truss 9 extends is an arc shape in the YZ plane (see part (b) of FIG. 2). In the following description, the dismantling method will be described in plan view of the arched roof structure 3, and therefore the extending direction of the lateral truss 9 is assumed to be the Y direction.

  The oblique truss T is configured by a plurality of truss members P that connect diagonals in a rectangular region formed by the vertical truss 8 and the horizontal truss 9. A plurality of the oblique trusses T are arranged at a predetermined interval in the X direction or the Y direction. The plurality of oblique trusses T include one end (support end SR1) included in the support side portion 6A and the other end (free end SR1a) included in the rear free side portion 7B, for example, as the oblique truss TR1. There is. Such an oblique truss T is called a support truss in the following description. For example, in the part (a) of FIG. 2, the right-side oblique trusses TR1 to TR5 are support trusses since the support ends SR1 to SR5 are included in the support side part 6A. Similarly, the left oblique trusses TL1 to TL5 are support trusses because the support ends SL1 to SL5 are included in the support side 6B. For example, the oblique truss TN is not a support truss because one end is included in the work side 7A and the other end is included in the rear free side 7B, and neither end is included in the support side.

The roof structure 3 shown in FIGS. 1 and 2 is an example. Therefore, the roof structure 3 to which the disassembling method according to the present embodiment is applied is the roof structure 3 shown in FIGS. 1 and 2. It is not limited to.
For example, the dismantling method according to the present embodiment is not limited to the dismantling of the arched roof structure, and may be a flat plate shape.

<Dismantling method of roof structure>
Hereinafter, the process of disassembling the roof structure 3 having the truss structure shown in FIG. 2 will be described in detail. As shown in FIG. 3, the disassembly method according to the present embodiment repeatedly performs the disassembly step with the first disassembly step S1 (n) and the second disassembly step S2 (n) as one disassembly step. . Note that n is an integer greater than or equal to 1, and indicates the number of steps repeated. For example, the first disassembly step S1 (1) and the second disassembly step S2 (1) indicate a first disassembly step. Moreover, 1st dismantling process S1 (2) and 2nd dismantling process S2 (2) show the 2nd dismantling step.

<First dismantling step>
First, the first dismantling step S1 (1) is performed. The first dismantling step S1 (1) includes a step S1a (1) for designating a support truss, a step S1b (1) for designating a first dismantling target region, and a step S1c for removing the truss member P in the first dismantling target region. (1).

  As shown in part (a) of FIG. 4, a support truss is designated (step S1a (1)). The diagonal truss TR1 is designated as the first support truss (first support portion), and the diagonal truss TR2 is designated as the second support truss (second support portion). The first support truss has a support end SR1 (first support end) that is closest to the working side portion 7A among the plurality of support ends SR1 to SR5. Therefore, when the truss member is removed from the working side 7A side, the diagonal truss T having the support end closest to the working side 7A is in the order of the diagonal truss TR1, the diagonal truss TR2, the diagonal truss TR3, and the diagonal truss TR4. It will change. The second support truss is located closer to the rear free side 7B than the first support truss. Now, when the oblique truss TR1 is designated as the first support truss, any one of the oblique trusses TR2, TR3, TR4, TR5 can be designated as the second support truss. Here, the diagonal truss TR2 adjacent to the diagonal truss TR1 and having the support end SR2 (second support end) is designated as the second support truss.

  Next, as shown in part (b) of FIG. 4, the first disassembly target area FD (1) is designated (step S1b (1)). The first dismantling target area FD (1) includes an oblique truss TR1 that is the first support truss between the virtual reference line L1 including the support end SR2 of the oblique truss TR2 that is the second support truss and the work side 7A. It is specified not to include. More specifically, the first dismantling target area FD (1) is designated so as not to include the support end SR1 of the oblique truss TR1.

  Next, the truss member in the first dismantling target area FD (1) is removed (step S1c (1)). Specifically, first, all the truss members in the first region F1 (1) are removed. Thereafter, all the truss members P in the second region F2 (1) are removed. Here, a plurality of truss members exist in the first dismantling target area FD (1). When removing the truss member, for example, the truss member may be removed at a time while maintaining the truss structure in the first dismantling target area FD (1). Specifically, after maintaining the truss structure in the first dismantling target area FD (1), the truss structure in the first dismantling target area FD (1) and the truss structure outside the first dismantling target area FD (1) are connected. The truss structure in 1st dismantling object area | region FD (1) may be removed by cut | disconnecting some truss members currently performed. Moreover, you may remove the truss member in 1st dismantling object area | region FD (1) for every several truss members. Further, the truss members may be removed one by one. Thus, when the truss member in the first dismantling target area FD (1) is divided and removed, the work can be performed more easily.

  In a state where the truss member in the first dismantling target area FD (1) is removed, the support ends SR1 to SR5 of the oblique trusses TR1 to TR5 are respectively connected to the wall structure 2A. Further, the support ends SL1 to SL5 of the diagonal trusses TL1 to TL5 are connected to the wall structure 2B. Therefore, since these diagonal trusses TR1 to TR5 and TL1 to TL5 play a role of so-called firing, the strength reduction of the roof structure 3 is suppressed.

  Next, 2nd dismantling process S2 (1) is implemented. The second dismantling step S2 (1) includes a step S2a (1) for designating a second dismantling target region and a step S2b (1) for removing the truss member P in the second dismantling target region.

  As shown in part (a) of FIG. 5, the second dismantling target area SD (1) is designated (step S2a (1)). The second dismantling target area SD (1) is an area including a part of the oblique truss TR1 that is the first support truss. The part of the oblique truss TR1 is the support end SR1 of the oblique truss TR1.

  Next, the truss member in the second dismantling target area SD (1) is removed (step S2b (1)). In the second dismantling step S2 (1), the support end SR1 of the oblique truss TR1 designated as the original first support truss is removed. Therefore, in the state where the support end SR1 is removed, the oblique trusses TL1, TL2, TL3, TL4, TL5 arranged on the left side and the oblique trusses TR2, TR3, TR4, TR5 arranged on the right side become the support truss and the roof structure. 3 is suppressed.

  The disassembly method according to the present embodiment advances the disassembly work of the roof structure 3 by repeating the first disassembly step S1 (n) and the second disassembly step S2 (n) described above. As the dismantling work proceeds, the designated support truss, the first dismantling target area FD (n), and the second dismantling target area SD (n) are designated each time. Hereinafter, the dismantling method according to the present embodiment will be further described while showing a specific method of dismantling work, a support truss designated each time, a first dismantling target area FD (n), and a second dismantling target area SD (n). To do.

<Second dismantling step>
A second dismantling step is performed. The second dismantling step includes a first dismantling process S1 (2) and a second dismantling process S2 (2).

  1st dismantling process S1 (2) is implemented. As shown in part (b) of FIG. 5, a support truss is designated (step S1a (2)). In the state shown in part (b) of FIG. 5, among the left support ends SL1 to SL5, the one closest to the working side portion 7A is the support end SL1. Therefore, the diagonal truss TL1 having the support end SL1 is designated as the first support truss. Then, the diagonal truss TL3 that is farther from the working side 7A than the diagonal truss TL1 is designated as the second support truss. By specifying the diagonal truss TL3 as the second support truss, the virtual reference line L2 passing through the support end SR3 of the diagonal truss TL3 is determined.

  As shown in part (a) of FIG. 6, the first disassembly target area FD (2) is designated (step S1b (2)). The first dismantling target area FD (2) is designated so as not to include the diagonal truss TL1 that is the first support truss between the virtual reference line L2 and the work side portion 7A. More specifically, the first dismantling target area FD (2) is designated so as not to include the support end SL1 of the oblique truss TL1. Next, the truss member P in the first dismantling target area FD (2) is removed (step S1c (2)). Specifically, all the truss members P in the first region F1 (2) are first removed. Thereafter, all the truss members P in the second region F2 (2) are removed. Finally, all the truss members P in the third region F3 (2) are removed.

  Next, 2nd dismantling process S2 (2) is implemented. As shown in part (b) of FIG. 6, the second dismantling target area SD (2) is designated (step S2a (2)). The second dismantling target area SD (2) is an area including a part of the oblique truss TL1 that is the first support truss. Specifically, the part of the oblique truss TL1 is the support end SL1 of the oblique truss TL1. Next, the truss member in the second dismantling target area SD (2) is removed (step S2b (2)). In the second dismantling step S2 (2), the support end SL1 of the oblique truss TL1 designated as the original first support truss is removed. Therefore, in the state shown in part (b) of FIG. 6, the diagonal trusses TR2, TR3, TR4, and TR5 arranged on the right side and the diagonal trusses TL2, TL3, TL4, and TL5 arranged on the left side serve as a support truss. The strength reduction of the structure 3 is suppressed.

<Third dismantling step>
A third disassembly step is performed. The third disassembly step has a first disassembly step S1 (3) and a second disassembly step S2 (3).

  1st dismantling process S1 (3) is implemented. As shown in part (a) of FIG. 7, a support truss is designated (step S1a (3)). In the state shown in part (a) of FIG. 7, the support end SL2 is the closest to the working side portion 7A among the left support ends SL2 to SL5. Therefore, the diagonal truss TL2 having the support end SL2 is designated as the first support truss. Then, the diagonal truss TL5 that is farther from the working side 7A than the diagonal truss TL2 is designated as the second support truss. By designating the oblique truss TL5 as the second support truss, the virtual reference line L3 passing through the support end SL5 of the oblique truss TL5 is determined.

  As shown in part (b) of FIG. 7, the first dismantling target area FD (3) is designated (step S1b (3)). The first dismantling target area FD (3) is designated so as not to include the diagonal truss TL2 that is the first support truss between the virtual reference line L3 and the work side 7A. More specifically, the first dismantling target area FD (3) is designated so as not to include the support end SL2 of the oblique truss TL2. Next, the truss member in the first dismantling target area FD (3) is removed (step S1c (3)). Specifically, first, the first dismantling target area FD (3) is divided into a first area part F1 (3) to a 15th area part F15 (3) which are a plurality of area parts. And the truss member in each area | region part is removed in order of 1st area | region part F1 (3)-15th area | region part F15 (3). Here, the tenth region F10 (3) is a region portion (third region portion) formed between the oblique truss TL2 that is the first support truss and the work side portion 7A. By removing the tenth region F10 (3) around the support end SL2, no excessive force is applied to the support end SL2, and the arch truss can be stably supported.

  Next, 2nd dismantling process S2 (3) is implemented. As shown in part (a) of FIG. 8, the second dismantling target area SD (3) is designated (step S2a (3)). The second dismantling target area SD (3) is an area including a part of the oblique truss TL2 that is the first support truss. Specifically, the part of the oblique truss TL2 is the support end SL2 of the oblique truss TL2. Next, the truss member in the second dismantling target area SD (3) is removed (step S2b (3)). In the second dismantling step S2 (3), the support end SL2 of the oblique truss TL2 designated as the original first support truss is removed. Therefore, in the state shown in FIG. 8A, the oblique trusses TR2, TR3, TR4, and TR5 arranged on the right side and the oblique trusses TL3, TL4, and TL5 arranged on the left side serve as a support truss and the roof structure. 3 is suppressed.

<4th dismantling step>
A fourth disassembly step is performed. The fourth disassembly step has a first disassembly step S1 (4) and a second disassembly step S2 (4).

  1st dismantling process S1 (4) is implemented. As shown in part (b) of FIG. 8, a support truss is designated (step S1a (4)). In the state shown in part (b) of FIG. 8, among the right support ends SR2 to SR5, the one closest to the working side portion 7A is the support end SR2. Therefore, the diagonal truss TR2 having the support end SR2 is designated as the first support truss. Then, the diagonal truss TR5 that is further away from the work side 7A than the diagonal truss TR2 is designated as the second support truss. By designating the oblique truss TR5 as the second support truss, the virtual reference line L4 passing through the support end SR5 of the oblique truss TR5 is determined.

  As shown in part (a) of FIG. 9, the first dismantling target area FD (4) is designated (step S1b (4)). The first dismantling target area FD (4) is designated so as not to include the diagonal truss TR2 that is the first support truss between the virtual reference line L4 and the work side 7A. More specifically, the first dismantling target area FD (4) is designated so as not to include the support end SR2 of the oblique truss TR2. Next, the truss member in the first dismantling target area FD (4) is removed (step S1c (4)).

  Next, 2nd dismantling process S2 (4) is implemented. As shown in part (b) of FIG. 9, the second dismantling target area SD (4) is designated (step S2a (4)). The second dismantling target area SD (4) is an area including a part of the diagonal truss TR2 that is the first support truss. Specifically, the part of the oblique truss TR2 is the support end SR2 of the oblique truss TR2. Next, the truss member in the second dismantling target area SD (4) is removed (step S2b (4)). In the second dismantling step S2 (4), the support end SR2 of the oblique truss TR2 designated as the original first support truss is removed. Therefore, in the state shown in part (b) of FIG. 9, the diagonal trusses TR3, TR4, TR5 arranged on the right side and the diagonal trusses TL3, TL4, TL5 arranged on the left side serve as support trusses. Strength reduction is suppressed. Moreover, since the horizontal truss 9, which is a vertical truss that forms one surface, exerts an arch effect, the occurrence of deflection is suppressed.

<Final dismantling step>
As shown in part (a) of FIG. 10, in the final dismantling step, the truss members in the respective region portions are removed in the order of the dismantling target region portion N1 to the dismantling target region portion N8.

  As shown in part (b) of FIG. 10, after repeatedly performing from the first disassembly step to the fourth disassembly step, the final disassembly step is performed to complete the disassembly of the roof structure 3.

  By the way, when disassembling the dome-shaped roof structure 3, a method of disassembling sequentially from the outer periphery of the dome roof in one direction is common. However, this method may impair the stability of the undisassembled part. Then, when the present inventors earnestly examined, in addition to the vertical truss 8 and the horizontal truss 9, the roof structure 3 shown by FIG. Among these, the horizontal truss 9 and the diagonal truss T have an arch effect and contribute to the strength of the roof structure 3. Therefore, the inventors paid attention to the arch effect of the lateral truss 9 and the support ends SR and SL of the oblique truss T. Specifically, the truss member on the inner side is removed while leaving the oblique truss T as effectively as possible (that is, as many support ends SR and SL as possible). According to this method, it is possible to disassemble the lateral truss 9 in order from the work side 7A while supporting the undisassembled roof structure 3 with the diagonal truss T (while making the roof of the undisassembled part self-supporting).

  According to the dismantling method described above, the load acting on the support ends SL and SR is reduced by removing the truss member in the first dismantling target region. Eliminate the instability of the foundation. Furthermore, since the diagonal truss T plays the role of firing, the stability of the arch truss roof can be maintained until the final stage of dismantling. Specifically, in the dismantling method, the dismantling operation can be performed while supporting the entire truss structure up to the final stage of dismantling with two or more support ends SL and SR. Therefore, the dismantling work can be performed while maintaining the balance of the roof structure 3. Moreover, according to the dismantling method, the load acting on the support ends SL and SR can be reduced while reducing the weight of the truss structure of the support ends SL and SR. In addition, since the diagonal truss T plays the role of firing, the deflection of the one-side truss structure can be suppressed and the roof structure 3 can be made independent, and the occurrence of inclination can be suppressed to counter the tensile load, and further stability can be achieved. Can be maintained. When the final one-side truss is disassembled, the diagonal truss T becomes a break point by pulling it forward (or backward), so that it can be disassembled stably.

  In short, the disassembling method according to the present embodiment is such that when the truss members constituting the roof structure 3 are removed, the oblique trusses TR1 to TR4 and TL1 to 4 function as so-called fire-fighting, thereby disassembling the roof structure being disassembled. 3 to suppress the strength reduction. First, the truss member P is removed so as to leave a truss member (that is, a supporting truss) in a region where the contribution to the strength of the roof structure 3 is high. Then, the roof structure 3 is lightened by the removed truss member P. When the mass of the roof structure 3 decreases, a support truss that can be removed even if it is removed appears. Therefore, it is possible to remove the support truss without any problem. By repeatedly performing these steps, it is possible to proceed with the dismantling work while suppressing a decrease in strength to the roof structure 3. As a result, safety can be secured while reducing the cost required for dismantling and shortening the construction period.

  The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.

  For example, application of the dismantling method is not limited to a roof structure having a truss structure. The present invention is also applicable to a roof structure having a structure having an arch effect (for example, reinforced concrete). Furthermore, in the said embodiment, although the wall structure was illustrated as a support structure, a support structure is not limited to a wall structure. The support structure is not particularly limited as long as it supports the roof structure, and may be a column structure, for example. In addition, in the above embodiment, the roof structure has been described as a configuration in which a film-like member such as a sheet is disposed in the truss structure. However, since the dismantling method can be applied to a roof structure having a truss structure, for example, instead of a film-like member such as a sheet, a metal roof plate is attached. Good.

  Moreover, in the said embodiment, the original roof structure illustrated what has a pair of support edge part 6 and a pair of free edge part 7. FIG. The application of the dismantling method according to the present invention is not limited to such a roof structure. For example, the roof structure may have a rectangular shape in plan view, and among the four sides, three sides may be support sides and one side may be a free side. Further, the roof structure may have a rectangular shape in plan view, and all of the four sides may be support sides.

  The disassembly method according to the present invention is not limited to the order of disassembly described above as long as the second disassembly process is performed after the first disassembly process.

  For example, after the truss member in the first dismantling target area FD (1) is removed, the truss member in the first dismantling target area FD (2) is removed. Then, after removing the truss member in the second dismantling target area SD (1), the truss member in the second dismantling target area SD (2) may be removed. Also in this case, after the first dismantling step (the step of removing the truss members in the first dismantling target region FD (1) and the first dismantling target region FD (2)), the second dismantling step (second dismantling target region SD) (1) and the step of removing the truss member in the second dismantling target area SD (2).

  Moreover, after removing the truss members in the first dismantling target area FD (1), the truss members in the second dismantling target areas SD (1) and SD (2) may be removed. Also in this case, the truss in the second dismantling process (second dismantling object areas SD (1), SD (2) after the first dismantling process (the process of removing the truss member in the first dismantling object area FD (1)). The step of removing the member) is performed.

DESCRIPTION OF SYMBOLS 1 ... Building, 2 ... Support structure, 3 ... Roof structure, 2A ... Wall structure, 2B ... Wall structure, 6, 6A, 6B ... Support side part, 7 ... Free side part, 7A ... Work side part, 7B: Rear free side, 8 ... Vertical truss, 9 ... Horizontal truss, T, TR1, TR2, TR3, TR4, TR5, TL1, TL2, TL3, TL4, TL5, TN ... Oblique truss (supporting part), P ... Truss member (structural member), SR1, SR2, SR3, SR4, SR5, SL1, SL2, SL3, SL4, SL5 ... support end, FD ... first dismantling object area, SD ... second dismantling object area, L1, L2, L3, L4 ... Virtual reference line.

Claims (3)

A method of dismantling the roof of a building,
The building is
A roof structure configured by combining a plurality of structural members;
A support structure coupled to the roof structure to receive a load in a vertical direction of the roof structure,
The roof structure being disassembled includes at least one support side connected to the support structure and receiving a support force, and a work side different from the support side,
A first support part formed by the structural member and including a first support end constituting the support side part, and formed by the structural member and constituting the support side part from the first support end. And a second support portion including a second support end separated from the work side, wherein the first support portion and the second support portion extend in a direction away from the work side. The step of specifying;
Removing the structural member included in a first disassembly target region formed between a virtual reference line including a second support end of the second support portion and the work side portion, the first disassembly target The region includes a first disassembly step that does not include the first support end of the first support portion;
A method of demolishing a roof of a building, comprising: a second demolition step that is performed after the first demolition step and removes the structural member included in a second demolition target region including the first support end. The first dismantling step includes
Dividing the first dismantling target area into a plurality of area parts;
The method of demolishing the roof of a building according to claim 1, comprising removing the structural member for each of the plurality of region portions.   The said 1st dismantling object area | region further disassembles the roof of the building of Claim 2 which further includes the process of removing the said structural member in the area | region part formed between the said 1st support part and the said working edge part. Method.

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