Dome construction method

Abstract

To provide a dome construction method that can achieve integration of a ring body and a lower structure even before an upper roof structure is constructed.SOLUTION: A dome construction method for a dome which comprises a structure, a ring body joined to the structure, and a roof structure joined to the ring body includes: a ring body construction step for constructing the ring body; a diameter expansion step for expanding the ring body by diameter expansion means; a ring body joining step for joining the expanded ring body to the structure; and a roof structure joining step for removing the diameter expansion means after constructing the roof structure on the expanded ring body.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a dome construction method. [Background technology]

[0002] Conventionally, a dome structure has been proposed in which a tension ring body and a compression ring body are connected by a beam (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-27594 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, a dome structure is constructed with a ring body to which tension is applied and an upper dome structure (also called a roof structure) that is assembled to the top of the ring body. When a vertical long-term load (such as roof material) is loaded, tension acts on the ring body, creating a stable structure for the entire dome.

[0005] The ring body cannot be integrated with the substructure until the ring body expands and deforms due to tension and the structure becomes stable, so the ring body needs to be suspended by a bent gantry or similar device during construction until they are integrated.

[0006] Furthermore, a mechanism must be provided during construction to attach a shell structure, beams, compression ring body, etc. to the ring body, so that when a load from above acts on the ring body and the ring body expands, the ring body with the shell structure, beams, compression ring body, etc. attached thereto will slide toward the lower structure.

[0007] As a result, in construction projects where the construction of the upper dome structure is delayed, the untensioned ring body will be left floating for long periods of time on the erection bent gantry, raising concerns about safety in the event of an earthquake. In addition, with regard to construction, as the integration does not progress, watertight construction and exterior wall construction will not progress, resulting in a problem of longer construction times.

[0008] In consideration of the above, the present disclosure aims to provide a dome construction method that can realize integration of a ring body and a lower structure before the upper roof structure is constructed. [Means for solving the problem]

[0009] The dome construction method of the first aspect is a dome construction method for a dome comprising a structural body, a ring body joined to the structural body, and a roof structural body joined to the ring body, and includes a ring body construction process for constructing the ring body, an expansion process for expanding the ring body by an expansion means, a ring body joining process for joining the expanded ring body to the structural body, and a roof structure joining process for constructing the roof structure on the expanded ring body and then removing the expansion means.

[0010] In the dome construction method according to the first aspect, a ring body is constructed in a ring body construction step.

[0011] In the diameter expanding step, the diameter of the ring body is expanded by the diameter expanding means.

[0012] In the ring body joining step, the ring body whose diameter has been expanded is joined to a structure.

[0013] In the roof structure joining step, after the roof structure is constructed on the diameter-expanded ring body, the diameter-expanding means is removed.

[0014] After the roof structure is constructed in the roof structure joining process, the expansion means is removed, but the load of the roof structure is transmitted to the ring body, which causes the ring body to expand in diameter and apply tension to it, so the dome remains stable for the long term; in other words, a stable structure is established for the dome as a whole.

[0015] A dome construction method according to a second aspect is a dome construction method for a dome comprising a structure including a plurality of pillars spaced apart circumferentially, a ring body joined to the pillars, and a roof structure joined to the ring body, and includes a ring body construction process for constructing the ring body, an expansion process for expanding the ring body using an expansion means, a ring body joining process for joining the expanded ring body to the pillars, a removal process for removing the expansion means, and a roof structure joining process for constructing the roof structure on the ring body and applying tension to the ring body.

[0016] In the dome construction method according to the second aspect, a ring body is constructed in a ring body construction step.

[0017] In the diameter expanding step, the diameter of the ring body is expanded by the diameter expanding means.

[0018] In the ring joining step, the rings whose diameters have been expanded are joined to the respective supports.

[0019] In the removal step, the diameter expanding means is removed. By removing the diameter expanding means, the ring body is reduced in diameter, and the pillars to which the ring body is joined are tilted inward, so that the ring body in a reduced diameter state is supported by the pillars.

[0020] In the roof structure joining process, the roof structure is joined to the ring body, which transfers the load of the roof structure to the ring body, causing the ring body to expand in diameter and apply tension to the ring body, while the inwardly tilted columns return to their original state, making the dome stable for a long period of time; in other words, a stable frame is established for the dome as a whole.

[0021] In the dome construction method of the third aspect, the expansion means is either a first group of jacks that pull the ring body in the diameter expansion direction from the outside, a second group of jacks that push the ring body in the diameter expansion direction from the inside, or a heating means that heats the ring body to expand it.

[0022] In the dome construction method according to the third aspect, the ring body can be expanded in diameter by pulling the ring body from the outside in the diameter expanding direction with the first jack group. Moreover, in the dome construction method according to the third aspect, the ring body can be expanded in diameter by pushing and expanding the ring body from the inside in the diameter expanding direction with the second jack group.

[0023] In a dome construction method according to a fourth aspect, the diameter expanding means is a heating means for heating the ring body to expand the diameter thereof.

[0024] In the dome construction method according to the fourth aspect, the ring body can be thermally expanded and its diameter can be increased by heating the ring body with the heating means.

[0025] In a dome construction method according to a fifth aspect, the structure is a support arranged on a circumference, and includes a temporary support column that is arranged along the support column and supports ring pieces that are connected to form the ring body, a vent member that slidably supports the temporary support column, and a fixing / unfixing member that fixes or unfixes the temporary support column and the vent member.

[0026] In the dome construction method according to the fifth aspect, a temporary support column is provided along the support column, and the vent member slidably supports the temporary support column. In addition, the temporary support column and the vent member can be fixed or released by a release member.

[0027] By releasing the fixation between the temporary tie pole and the vent member, the temporary tie pole and the vent member can be moved relative to each other.

[0028] When forming a ring body on the temporary bundle column and expanding the diameter of the ring body, the fixation between the temporary bundle column and the vent member can be released, and the temporary bundle column can be moved outward together with the ring body, so that the ring body can be joined onto the support column. Effect of the Invention

[0029] As described above, the dome construction method of the present invention has the excellent effect of realizing integration of the ring body and the lower structure before the upper roof structure is constructed. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view showing a building with a dome. [Diagram 2] 1A to 1E are explanatory views for explaining a dome construction method according to a first embodiment. [Diagram 3] FIG. 2A is a plan view showing a tension applying member, and FIG. 2B is a vertical cross-sectional view showing the tension applying member. [Figure 4] FIG. 2A is a plan view showing a tension applying member, and FIG. 2B is a vertical cross-sectional view showing the tension applying member. [Diagram 5] 6(A) to 6(E) are explanatory views for explaining a dome construction method according to a second embodiment. [Figure 6] 6(A) is a perspective view showing a lower ring body supported by a temporary column, and FIG. 6(B) is a perspective view showing the temporary column shown in FIG. 6(A). [Figure 7] FIG. 11 is a vertical cross-sectional view showing a dome during construction. [Figure 8] FIG. [Figure 9] FIG. 13 is a perspective view showing a dome having an upper ring body supported by a plurality of vent supports. [Figure 10] 1 is a cross-sectional view showing a dome during construction in which a lower ring body is supported on a substructure made of reinforced concrete. [Figure 11] FIG. 11 is a vertical cross-sectional view of a building showing a configuration in which a lower ring body is supported on a substructure made of reinforced concrete. [Figure 12] FIG. 11 is a vertical cross-sectional view of a dome showing a configuration in which a lower ring body is supported on a foundation. [Figure 13] 13A to 13C are perspective views showing a dome according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] [First embodiment] A dome construction method according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 4. 1 shows a perspective view of a building 14 having a dome 10 on a substructure 12 as an example of a structure of the present disclosure. The building 14 of this embodiment may be a stadium as an example, but may be something other than a stadium.

[0032] The lower structure 12 includes a plurality of steel columns 16 arranged in a circular shape on a foundation F. The steel columns 16 are an example of a support column of the present disclosure.

[0033] The dome 10 is connected to the upper part of a steel column 16. The dome 10 is composed of an annular lower ring body 18, an annular upper ring body 20 arranged inside the lower ring body 18 and above the lower ring body 18, a plurality of beams (upward beams) 22 connecting the lower ring body 18 and the upper ring body 20 and extending in the radial direction (radial direction) of the lower ring body 18 and the upper ring body 20, and a roof material (not shown). The dome 10 of this embodiment has a truncated cone shape as a whole. The lower ring body 18 can also be called a tension ring body, and the upper ring body 20 can also be called a compression ring body. In this embodiment, the lower ring body 18 is an example of a ring body of the present disclosure, and the upper ring body 20 and the beam member 22 are an example of a roof structure of the present disclosure.

[0034] The lower ring body 18 includes a plurality of ring pieces 18A formed in an arc shape, and adjacent ring pieces 18A are connected to each other. As an example, the ring pieces 18A are formed of a steel material or the like. The upper ring body 20 and the beam material 22 are also formed of a steel material or the like.

[0035] Next, an outline of the dome construction method of this embodiment will be described below. (1) First, as shown in FIG. 2(A), a plurality of steel columns 16 are arranged in a circular ring shape at intervals on a foundation F to construct a substructure 12. Additionally, a plurality of arc-shaped ring pieces 18A are connected in an annular shape on the upper side of the lower structure 12 to provide a lower ring body 18 on the upper side of the lower structure 12 (steel column 16) (one example of a ring body construction process of the present disclosure. See FIG. 1 for the ring pieces 18A.) A method of supporting the lower ring body 18 will be described later with reference to FIG. 6. Here, the diameter D of the lower ring body 18 disposed on the upper side of the lower structure 12 (steel columns 16 ) is set to be slightly smaller than the diameter of an imaginary circle C passing through the upper ends of the steel columns 16 .

[0036] (2) Pretension is applied to the lower ring body 18 to expand the diameter of the lower ring body 18, so that the diameter D of the lower ring body 18 is equal to the diameter of an imaginary circle C passing through the upper end of each steel column 16, as shown in Figure 2 (B) (an example of the tension applying process of the present disclosure. Note that the dotted line indicates the lower ring body 18 before expansion). The method of applying pretension to the lower ring body 18 to expand its diameter will be described in detail below with reference to FIGS.

[0037] (3) As shown in FIG. 2(C), the lower ring body 18, which has been pretensioned to expand its diameter, is integrated with the lower structure 12 (steel column 16) (an example of the ring body joining process of the present disclosure).

[0038] (4) While maintaining the tension as shown in FIG. 2(D), one end of the beam 22 is connected to the lower ring body 18 as shown in FIG. 2(E), and the other end of the beam 22 is connected to the upper ring body 20, thereby constructing the dome 10 on the lower structure 12. The method for constructing the dome 10 will be described in detail later with reference to FIG.

[0039] After constructing the dome 10 on the lower structure 12, the pretension applied to the lower ring body 18 is removed (an example of a roof structure joining process of the present disclosure). Note that a method for removing the pretension from the lower ring body 18 will be described in detail later.

[0040] The load of the upper ring body 20, the beam material 22, and the roof material (not shown) is transmitted to the lower ring body 18, so that tension is applied to the lower ring body 18. The application of tension causes the lower ring body 18 to stretch, thereby stabilizing the dome 10 over the long term; in other words, a stable structure is established for the dome 10 as a whole.

[0041] Therefore, even in construction work that delays the construction of the dome 10, the lower ring body 18 is not kept floating for a long period of time by an erected bent platform or the like, but is integrated with the lower structure 12, thereby improving safety even during earthquakes compared to when the lower ring body 18 is kept floating by an erected bent platform or the like.

[0042] Furthermore, in this embodiment, the lower ring body 18 is integrated with the lower structure 12 before constructing the dome 10, so that construction work for the dome 10 and construction of the exterior walls of the lower structure 12 can be carried out regardless of the completion of the dome 10, thereby making it possible to shorten the construction period of the building 14.

[0043] (Pretensioning method for the lower ring body (expansion method) Part 1) First, a first method for pretensioning the lower ring body 18 will be described below. To apply pretension to the lower ring body 18, a tension applying member 34 including a strut support 24, a strut intersection block 26, a strut 28, a hydraulic jack 30, and a load cell shown in Figures 3(A) and 3(B) is installed. The tension applying member 34 is an example of the second jack group of the present disclosure.

[0044] First, as shown in Figures 3(A) and 3(B), the lower ring body 18 is placed on the lower structure 12, and a strut support 24 is erected on the foundation F at the center of the lower structure 12. A strut intersection block 26 is provided on the upper part of the strut support 24, and multiple struts 28 are provided in the circumferential direction so as to span between the strut intersection block 26 and the lower ring body 18. A hydraulic jack 30 is provided midway on the struts 28, and a load cell (not shown) for measuring the force acting on the struts 28 is provided.

[0045] The lower ring body 18 is disposed horizontally, the strut intersection block 26 is disposed at the same height as the lower ring body 18, and the strut 28 is also horizontal.

[0046] After the tensioning members 34 are installed, the hydraulic jacks 30 of each strut 28 can be extended to expand the diameter of the lower ring body 18 and pretension can be applied to the lower ring body 18.

[0047] After the dome 10 is completed, the tensioning member 34 is removed.

[0048] (Method 2 for expanding the diameter of the lower ring body) Next, a second method for expanding the diameter of the lower ring body 18 will be described below. To apply pretension to the lower ring body 18, a tension applying member 38 including a back anchor receiving stand 32, a back anchor 35 such as a wire, a hydraulic jack 36, and a load cell (not shown) is installed as shown in Figures 4(A) and 4(B). The tension applying member 38 is an example of the first jack group of the present disclosure.

[0049] First, as shown in Figures 4(A) and 4(B), the lower ring body 18 is placed on the lower structure 12, the back anchor receiving stand 32 is erected in a circular shape on the outer periphery of the lower structure 12, and a hydraulic jack 36 and a load cell (not shown) are placed on the foundation F on the outer periphery of the back anchor receiving stand 32.

[0050] The lower ring body 18 is disposed horizontally, and the upper end of the back anchor receiving stand 32 is positioned at the same height as the lower ring body 18. The back anchor 35 has one end connected to the lower ring body 18 and the other end connected to the hydraulic jack 36 .

[0051] After the tensioning member 38 is installed, the back anchors 35 can be pulled radially outward with each hydraulic jack 36 to expand the diameter of the lower ring body 18 and apply pretension to the lower ring body 18.

[0052] After the dome 10 is completed, the tension applying member 38 is removed.

[0053] [Second embodiment] A dome construction method according to the second embodiment of the present disclosure will be described with reference to Fig. 5. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0054] The dome construction method of this embodiment will be described below. (1) First, as shown in FIG. 5(A), a plurality of steel columns 16 are arranged in a circular ring shape at intervals on a foundation F to construct a substructure 12. In addition, a plurality of ring pieces 18A formed in an arc shape are connected in an annular shape to provide a lower ring body 18 on the upper side of the lower structure 12 (steel column 16) (an example of the ring body construction process of the present disclosure. See FIG. 1 for ring pieces 18A). The diameter D of the lower ring body 18 disposed on the upper side of the lower structure 12 (steel columns 16 ) is set to be slightly smaller than the diameter of an imaginary circle C passing through the upper ends of the steel columns 16 .

[0055] (2) Using the tension applying member 34 or the tension applying member 38, pretension is applied to the lower ring body 18 to expand the diameter of the lower ring body 18, and the diameter of the lower ring body 18 is made equal to the diameter of an imaginary circle C passing through the upper end of each steel column 16, as shown in FIG. 5(B) (an example of the tension applying process of the present disclosure).

[0056] (3) As shown in FIG. 5(C), the lower ring body 18, which has been pretensioned to expand its diameter, is integrated with the lower structure 12 (steel column 16) (an example of the ring body joining process of the present disclosure).

[0057] (4) After the lower ring body 18 and the lower structure 12 are integrated, the pretension is released (removal of the tension applying member 34 or tension applying member 38). By removing the pretension from the lower ring body 18, the diameter of the lower ring body 18 is reduced, as shown in Fig. 5(D). As the diameter of the lower ring body 18 is reduced, the steel column 16 connected to the lower ring body 18 is elastically deformed so as to collapse toward the inside of the lower ring body 18 (note that in Fig. 5(D), the deformation of the steel column 16 is exaggerated for ease of understanding).

[0058] (5) Next, as shown in FIG. 5(E), the dome 10 is constructed on the substructure 12 (an example of a roof structure joining process of the present disclosure).

[0059] Since the load of the upper ring body 20, the beam material 22, and the roof material (not shown) is transmitted to the lower ring body 18, tension is applied to the lower ring body 18, causing the lower ring body 18, which had been reduced in diameter, to expand in diameter. As a result, the steel column 16, which had been elastically deformed, returns to its original shape (straight shape in the vertical direction). As in the first embodiment, the dome 10 remains stable over the long term, and a stable structure is established for the dome as a whole.

[0060] [Third embodiment] A dome construction method according to a third embodiment of the present disclosure will be described. In the first embodiment, the lower ring body 18 is expanded in diameter using the tension applying member 34, and in the second embodiment, the lower ring body 18 is expanded in diameter using the tension applying member 38, but in the third embodiment, the lower ring body 18 is expanded in diameter by heating (raising the temperature higher than the air temperature (ambient temperature)) the lower ring body 18 with a heating device such as an electric heater to expand it. The heating device is an example of the expanding means of the present disclosure.

[0061] After the dome 10 is constructed on the lower ring body 18 which has been heated and expanded in diameter, the heating device is removed, heating is stopped, and the lower ring body 18 is allowed to cool naturally.

[0062] In this embodiment, too, the load of the upper ring body 20, the beam material 22, and the roof material (not shown) is transmitted to the lower ring body 18, so that tension is applied to the lower ring body 18, and as in the first and second embodiments, the dome 10 is stable and a stable structure is established for the dome as a whole.

[0063] (Support method for the lower ring body) Before being connected to the steel column 16, the lower ring body 18 can be supported by the temporary column 40 as follows. As shown in Fig. 6(B), the temporary column 40 of this embodiment is configured to include a lower column member 40A made of H-shaped steel and an upper column member 40B made of H-shaped steel. The lower column member 40A is an example of the vent member of the present disclosure, and the upper column member 40B is an example of the temporary column of the present disclosure.

[0064] A rectangular first support plate 42 is joined to the upper end of the lower pillar member 40A, and a rectangular second support plate 44 is joined to the lower end of the upper pillar member 40B.

[0065] The second support plate 44 has a plurality of long holes 46 formed therein, and the first support plate 42 has a plurality of bolt holes (circular holes; not shown in FIG. 6(B)). Bolts 48, an example of a bolt member, are inserted through the long holes 46 of the second support plate 44 and the bolt holes of the first support plate 42, and nuts 50 are screwed onto the bolts 48 and tightened to secure the first support plate 42 and the second support plate 44 together. The long hole 46, the bolt 48, and the nut 50 are an example of a fixation / release member of the present disclosure.

[0066] In this embodiment, the long holes 46 are formed in the second support plate 44 and the bolt holes are formed in the first support plate 42, but it is also possible to form the bolt holes in the second support plate 44 and the long holes 46 in the first support plate 42.

[0067] Since the long hole 46 has a longitudinal direction oriented in the radial direction of the lower ring body 18, the lower ring body 18 is supported, and with the bolt 48 inserted through the long hole 46 and the bolt hole, the first support plate 42 and the second support plate 44 can be moved relative to each other in the radial direction of the lower ring body 18. In other words, the upper pillar member 40B can be moved relative to the lower pillar member 40A in the radial direction of the lower ring body 18.

[0068] 6(A), the temporary beam columns 40 can be installed on both sides of the steel column 16 below the lower ring body 18, and the upper ends of the upper column members 40B can be temporarily fixed to the lower surface of the lower ring body 18 before being fixed to the steel column 16. In other words, the temporary beam columns 40 are arranged along the lower structure 12.

[0069] Since the first support plate 42 and the second support plate 44 are capable of moving relative to one another in the radial direction of the lower ring body 18, it is possible to support the lower ring body 18 and expand the diameter of the lower ring body 18 using the tensioning member 34 or the tensioning member 38 without fixing the first support plate 42 and the second support plate 44 with the bolts 48 and nuts 50.

[0070] In addition, this temporary column 40 can be removed after the dome 10 is constructed on the lower ring body 18 and the lower ring body 18 and the lower structure 12 are integrated together.

[0071] (How to build a dome part 1) An example of a method for constructing the dome 10 on the lower ring body 18 mounted on the lower structure 12 will be described below with reference to FIGS.

[0072] As shown in Figure 7, the beam 22 lifted by a crane 52 and the upper ring body 20 are supported by multiple bent supports 54, while the lower ring body 18, the beam 22, and the upper ring body 20 are connected, and the dome 10 can be constructed on top of the lower structure 12, as shown in Figure 8.

[0073] As shown in FIG. 9, the upper ring body 20 can be supported by a plurality of bent support members 54 while the beam member 22 is connected to the lower ring body 18 and the upper ring body 20 at the upper portion.

[0074] Also, as shown in FIG. 10, the upper ring body 20 can be supported on a lower structure 12A made of reinforced concrete, and after the steel beams 22 are assembled on the ground surface, they can be lifted and erected.

[0075] [Other embodiments] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

[0076] In the above embodiment, a dome 10 in which the lower ring body 18 is supported on the upper part of a steel column 16 has been described, but the present disclosure is not limited to this, and the dome 10 may be in a form in which the lower ring body 18 is supported on a substructure 12A made of reinforced concrete, for example, as shown in FIG. 11, or in a form in which the lower ring body 18 is supported on a foundation F, as shown in FIG. 12.

[0077] In the above embodiment, the upper ring body 20 is disposed inside the lower ring body 18, and the ends of the beams 22 extending radially inward from the lower ring body 18 are connected to the upper ring body 20, but the connection target of the ends of the beams 22 is not limited to the upper ring body 20. For example, without providing the upper ring body 20, the ends of multiple beams 22 may be connected at the center of the lower ring body 18 as shown in Figures 13(A) and 13(B).

[0078] The dome 10 shown in Fig. 13(A) is an example in which a conical shape is formed using straight beam members 22. The dome 10 shown in Fig. 13(B) is an example in which a hemispherical shape is formed using arc-shaped beam members 22.

[0079] 13(C) is an example of a dome 10 having a hemispherical shape, which is made by using a plurality of arc-shaped beam members 22 that intersect with each other and have different radii of curvature. In this way, the dome 10 can have various shapes. [Explanation of symbols]

[0080] 10. Dome 12 Lower structure (structure) 14 Building 16 Steel pillar (support) 18 Lower ring body (ring body) 18A Ring piece 20 Upper ring body (roof structure) 22 Beams (roof structure) 34 Tensioning member (second jack group, expanding means) 38 Tensioning member (first jack group, expanding means) 40 Temporary beams 40A Lower column member (temporary column) 40B Upper column member (vent member) 42 First support plate 44 Second Support Plate 46 Long hole (fixing release part) 48 Bolt (fixing release member) 50 Nut (fixing release part)

Claims

1. A dome construction method for a dome including a structural body, a ring body joined to the structural body, and a roof structural body joined to the ring body, comprising the steps of: A ring body construction step of constructing the ring body; a diameter expanding step of expanding the diameter of the ring body by a diameter expanding means; a ring body joining step of joining the expanded ring body to the structure; a roof structure joining step of constructing the roof structure on the expanded ring body and then removing the expanding means; A dome construction method comprising the steps of:

2. A method for constructing a dome comprising a structure including a plurality of support columns spaced apart in a circumferential direction, a ring body joined to the support columns, and a roof structure joined to the ring body, the method comprising the steps of: A ring body construction step of constructing the ring body; a diameter expanding step of expanding the diameter of the ring body by a diameter expanding means; a ring body joining step of joining the expanded ring body to the support; a removal step of removing the diameter expanding means; a roof structure joining step of constructing the roof structure on the ring body and applying tension to the ring body; A dome construction method comprising the steps of:

3. The diameter expanding means is a first jack group that pulls the ring body from the outside in a diameter expanding direction, or a second jack group that pushes the ring body from the inside in a diameter expanding direction. The dome construction method according to claim 1 or 2.

4. The diameter expanding means is a heating means for heating the ring body to expand the diameter. The dome construction method according to claim 1 or 2.

5. The structure is a set of pillars arranged on a circumference, A temporary support column is provided along the support column and supports ring pieces that are connected to each other to form the ring body; A vent member that slidably supports the temporary column; A fixing / unfixing member for fixing or unfixing the temporary column and the vent member; having The dome construction method according to claim 1 or 2.

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