JP2020112004A - Construction method for top level part of blowing-through structure - Google Patents

Abstract

To reduce the construction period for a top level part of a blowing-through structure.SOLUTION: In construction of a top level part of a blowing-through structure 1, a plurality of a pair of temporary columns 6, 6 are disposed so as to sandwich a vertical hole penetration part 2 on a floor surface of a fourth floor layer F4 as the highest floor layer, and then a bridge girder main body part 10A is disposed on each of the plurality of the pair of temporary columns 6, 6. When disposing the bridge girder main body part 10A across the vertical hole penetration part 2, the bridge girder main body part 10A is supported at the start side by connecting a balancing part 10B to a rear end of the bridge girder main body part 10A. Next, a work floor 16 is disposed on the plurality of bridge girder main body parts 10A, and then a temporary scaffold 17 is disposed thereon. Subsequently, construction of the top level part is conducted on the temporary scaffold 17. In the construction of the top level part of the blowing-through structure 1, since the temporary scaffold is not built up from a floor surface of the blowing-through structure 1, but is built up from the highest floor layer, the construction period of the top level part of the blowing-through structure 1 can be reduced. The construction cost of the top level part of the blowing-through structure 1 can be also reduced.SELECTED DRAWING: Figure 18

Description

TECHNICAL FIELD The present invention relates to a method for constructing a top end portion of a blow-out building, for example, construction of a top end portion of a blow-out structure having a blow-out space penetrating a plurality of floors inside a building having a plurality of floors (new construction work and renovation work). (Construction) method.

Generally, when constructing the top of a blow-through structure, a method of assembling a temporary scaffold from the floor of the blow-out space to the top floor or a stage with a long span that crosses the blow-out space There is a method to install it on the floor immediately below by using heavy equipment installed on the floor.

Note that the construction of the roof end portion of the blow-out structure is described in, for example, Patent Document 1, and the temporary training body and the lifting work stage can be installed at the same time so that the temporary training body and the stage for tooth lifting work can be installed at the same time. A temporary structure integrated with a stage is disclosed. Further, for example, Patent Document 2 discloses a method of constructing an emergency bridge that crosses a river.

JP, 2010-270545, A JP-A-4-169611

However, in the case of assembling the temporary scaffolding from the floor of the blow-out space or the method of installing a long-span stage that crosses the blow-out space with heavy equipment, the cost of the materials used and the work costs are large, and Also becomes longer. This problem becomes more remarkable as the number of floors through which the blow-out space penetrates increases. In addition, it is necessary to prohibit traffic around the floor of the lowest floor during the construction of the roof. Furthermore, the load applied to the floor on which the temporary scaffolding or heavy equipment is installed is large, and it may not be possible to install the temporary scaffolding or heavy equipment depending on the blow-out structure.

The present invention has been made in view of the above technical background, and an object thereof is to shorten the construction period of the top end portion of a blow-out building.

Moreover, this invention is made|formed from the above technical background, and it aims at reducing the construction cost of the top end part of a blow-out building.

Further, the present invention has been made from the above-mentioned technical background, and it is an object of the present invention to enable the construction of the top end of a blow-out structure without hindering its use on the lower floors. And

Then, the present invention is made from the above technical background, and enables the construction of the top end portion of the blow-out building even if the temporary scaffolding or heavy equipment cannot be installed on the floor of the blow-out building. To aim.

In order to solve the above-mentioned problems, a method of constructing a roof end portion of a blow-out building according to the present invention is a step of installing a plurality of bridge girders bridging a blow-out space on the uppermost floor of the blow-out building, and Installing a work floor so as to span a plurality of bridge girders, installing a temporary scaffolding on the work floor, performing a construction of the top end of the blow-out building on the temporary scaffolding, After the construction of the top end, a step of removing the temporary scaffold, a step of removing the work floor after removing the temporary scaffold, and a step of removing the plurality of bridge girders after removing the work floor. It is characterized by having.

In the invention according to claim 2, in the invention according to claim 1, the step of installing the bridge girder includes a plurality of units along the longitudinal direction of the bridge girder on the starting side on the floor surface of the uppermost floor. Forming the bridge girder having a length capable of bridging the blowout space by connecting girder members in series; and moving the bridge girder from the starting side toward the arrival side through the blowout space. Sometimes the step of connecting a balance part for supporting the bridge girder on the starting side to the rear end of the bridge girder, and moving the bridge girder and the balance part from the starting side to the reaching side by the blow-out space A step of installing the bridge girder so as to bridge.

In the invention according to claim 3, in the invention according to claim 2, the step of forming the bridge girder includes a step of installing a first temporary column at a position adjacent to the blow-out space on the starting side, Installing the second temporary column at a position adjacent to the blow-out space on the arrival side, and the first unit girder member on the starting side with the first unit girder member being supported by the first carrying means. A step of carrying to the temporary column and temporarily fixing the tip of the first unit girder member on the first temporary column; and, on the starting side, supported by the first temporary column and the first carrying means. Further, the second unit girder member is carried to the rear end of the first unit girder member while being supported by the second carrying means, and the tip of the second unit girder member is brought to the first unit girder member. A step of connecting to the rear end of the first unit girder member and the second unit girder member supported by the first temporary pillar and the second carrying means on the starting side. Carrying a third unit girder member supported by the first carrying means, and connecting the tip of the third unit girder member to the rear end of the second unit girder member. It is characterized by

In the invention according to claim 4, in the invention according to claim 2, in the step of connecting the balance portion to the rear end of the bridge girder, the plurality of unit girder members are connected to the rear end of the bridge girder. It is characterized by having a process.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the step of forming the bridge girder and the step of connecting the balance portion to the rear end of the bridge girder are performed in the blowout space on the starting side. A step of installing a first temporary column at an adjacent position; a step of installing a second temporary column at a position adjacent to the blow-out space on the arrival side; and a first unit girder member on the starting side. Is carried by the first transporting means to the first temporary column, and the tip of the first unit girder member is temporarily fixed on the first temporary column; The second unit girder member is carried to the rear end of the first unit girder member supported by the first temporary pillar and the first carrying means in a state of being supported by the second carrying means, Connecting the tip of the second unit girder member to the rear end of the first unit girder member; and, on the starting side, the first temporary column and the first carrier supported by the second carrying means. The third unit girder member is carried to the rear ends of the unit girder member and the second unit girder member while being supported by the first carrying means, and the tip of the third unit girder member is moved to the second end. And a step of connecting to the rear end of the unit girder member.

According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the last unit girder member constituting the balance portion is carried among the first conveying means or the second conveying means. It is characterized in that the carrier means is used as a part of the balance part.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the step of moving the bridge girder and the balance portion from the starting side toward the reaching side is performed with the first unit girder member. The step of removing the temporary fixing to the first temporary pillar, and the first or second transporting means, which is not used as a part of the balance part, are the bridge girder and the second transporting means. A step of arranging the bridge girder installation body at the center of gravity of the bridge girder installation body including a balance part, and a step of moving the bridge girder installation body to the arrival side while supporting the bridge girder installation body by a transportation means arranged at the center of gravity of the bridge girder installation body; After the tip of the bridge girder of the bridge girder installation body reaches the second temporary pillar, the step of temporarily fixing the tip of the bridge girder to the second temporary pillar is provided.

In the invention according to claim 8, in the invention according to claim 6, before moving the bridge girder and the balance part, a single member lighter than the unit girder member at the tip of the bridge girder on the starting side. It is characterized by having a step of connecting.

According to a ninth aspect of the present invention, in the invention according to the eighth aspect, the step of moving the bridge girder and the balance portion from the starting side toward the reaching side is performed with the first unit girder member. A step of removing the temporary fixing to the first temporary column, and a carrying means, which is not used as a part of the balance part, of the first carrying means or the second carrying means, Placing the bridge girder installation body at the center of gravity of the bridge girder installation body including the bridge girder and the balance part, and supporting the bridge girder installation body by the transportation means arranged at the center of gravity of the bridge girder installation body to the arrival side. And a step of temporarily fixing the tip of the bridge girder to the second temporary pillar after the tip of the bridge girder of the bridge girder installation body reaches the second temporary pillar. To do.

According to a tenth aspect of the present invention, in the invention according to any one of the third to fifth aspects, the first temporary column and the second temporary column have a height of the temporary column. It is characterized by having height changing means for changing.

According to an eleventh aspect of the present invention, in the invention according to any one of the third, fifth and tenth aspects, the first conveying means and the second conveying means are a moving means and the moving means. And a height changing means for changing the height of the carrying means.

According to a twelfth aspect of the present invention, in the invention according to any one of the second to eleventh aspects, the unit girder member has a truss structure.

According to a thirteenth aspect of the present invention, in the invention according to any one of the fourth to twelfth aspects, the plurality of unit girder members are connected in a step of forming one bridge girder among the plurality of bridge girders. It is characterized in that it is used as the bridge girder in the step of forming a bridge girder next to the plurality of bridge girders without disassembling the balance part formed in (1).

According to the present invention, at the time of construction of the top end of the blow-out structure, the temporary scaffolding is not assembled from the floor surface of the blow-out structure, but is assembled from the uppermost floor. It is possible to shorten the construction period.

In addition, when constructing the roof of the blow-out structure, the temporary scaffolding is not built up from the floor of the blow-out structure, but from the top floor, so the construction cost of the top of the blow-out structure is reduced. It becomes possible to do.

In addition, when constructing the roof of the blow-out structure, the temporary scaffolding is not built up from the floor of the blow-out structure, but it is built up from the top floor, so it can be used on lower floors without disturbing the top end. It becomes possible to carry out the construction.

Furthermore, even if temporary scaffolding or heavy equipment cannot be installed on the floor of the blow-out structure, it is possible to carry out the construction of the top end of the blow-out structure.

It is a principal part top view of the blow-through building which concerns on one embodiment of this invention. It is a principal part sectional drawing of the II line of FIG. FIG. 2 is a main-portion cross-sectional view taken along the line II-II of FIG. 1. It is a principal part top view of a blow-out building at the time of the temporary pillar installation process which is one process of the construction method of the ceiling part of the blow-out building of FIG. FIG. 5 is a cross-sectional view of the principal part taken along the line I-I of FIG. 4. It is an expansion perspective view of the unit girder member shown in FIG. FIG. 5 is a cross-sectional view of a portion corresponding to the line II of FIG. 4 during the process of forming the bridge girder main body after the process of FIG. 4. FIG. 8 is a cross-sectional view of a portion corresponding to the line I-I of FIG. 4 during the process of forming the bridge girder main body after the process of FIG. 7. FIG. 9 is a cross-sectional view of a portion corresponding to the line II of FIG. 4 during the process of forming the bridge girder main body after the process of FIG. 8. FIG. 10 is a cross-sectional view of a portion corresponding to line I-I of FIG. 4 during formation of the bridge girder main body after the step of FIG. 9. FIG. 11 is a cross-sectional view of a portion corresponding to the line II of FIG. 4 during the process of forming the bridge girder main body after the process of FIG. 10. FIG. 12 is a cross-sectional view of a portion corresponding to the line II of FIG. 4 during the process of forming the balance portion after the process of FIG. 11. FIG. 13 is a cross-sectional view of a portion corresponding to the line II of FIG. 4 during the process of forming the balance portion after the process of FIG. 12. It is a principal part top view of the blow-through building in the movement preparation process of the bridge girder main part and balance part after the process of FIG. It is a principal part sectional drawing of the II line of FIG. FIG. 15 is a cross-sectional view of the main parts of the blow-through structure during the moving process of the bridge girder main body and the balance part after the process of FIG. 14. It is a principal part top view of the blow-through structure after the process of FIG. It is a principal part sectional drawing of the II line of FIG. It is a principal part sectional drawing of the II-II line of FIG. It is a principal part top view of the blow-out building after the process of FIG. It is a principal part sectional drawing of the II line of FIG. FIG. 22 is a plan view of the main parts of the blow-through structure after the step of FIG. 21. It is a principal part sectional drawing of the III-III line of FIG. It is a principal part top view of the blow-through building after the process of FIG. FIG. 25 is a plan view of a main part of the blow-through building after the step of FIG. 24. It is a principal part sectional drawing of the III-III line of FIG. It is a principal part sectional drawing of the II-II line of FIG. FIG. 26 is a plan view of the main parts of the blown-out building after the installation step of the work floor after the step of FIG. 25. It is a principal part sectional drawing of the II line of FIG. It is a principal part sectional drawing of the II-II line of FIG. FIG. 29 is a main-portion cross-sectional view of a portion corresponding to the II line in FIG. 28 after the step in FIG. 28. It is a principal part top view of a blow-out building in the dismantling process of a temporary scaffold. It is a principal part sectional drawing of the IV-IV line of FIG. FIG. 33 is a plan view of a main part of the blow-through structure during the dismantling process of the temporary scaffolding after the process of FIG. 32. FIG. 35 is a plan view of the main parts of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 34. FIG. 36 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 35 after the step in FIG. 35; FIG. 37 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 35 after the step in FIG. 36. It is a principal part top view of the blow-out building after the process of FIG. FIG. 39 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 38 after the step in FIG. 38. FIG. 40 is a plan view of the main parts of the blow-through structure after the step of FIG. 39. FIG. 41 is a plan view of the main parts of the blown-out building after the step of FIG. FIG. 36 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 35 after the step in FIG. 35; FIG. 43 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 35 after the step in FIG. 42. FIG. 44 is a plan view of the main parts of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 43. FIG. 45 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 44 after the step in FIG. 44. FIG. 47 is a plan view of a main part of the blow-through structure during the dismantling process of the temporary scaffolding after the process of FIG. 45. FIG. 51 is a main-portion cross-sectional view of a portion corresponding to the VV line in FIG. 46 after the step in FIG. 46. FIG. 48 is a plan view of a main part of the blow-through structure during the dismantling process of the temporary scaffolding after the process of FIG. 47.

Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. In addition, in the drawings for describing the embodiments, the same components are denoted by the same reference symbols in principle, and repeated description thereof will be omitted.

(First embodiment)

First, an example of the blow-through structure according to the present embodiment will be described with reference to FIGS. 1 to 3. 1 is a plan view of a main part of a blow-through structure according to the present embodiment, FIG. 2 is a cross-sectional view of the main part taken along the line I-I of FIG. 1, and FIG. 3 is a cross-sectional view of the main part taken along the line II-II of FIG. is there. 2 and 3 show the second floor F2, the third floor F3, the fourth floor (uppermost floor) F4, and the ceiling floor (top end portion) TE of the blow-out structure 1.

The blow-out building 1 is a building having a vertical hole penetrating portion (blowing space) 2 penetrating a plurality of floors inside a building having a plurality of floors. The vertical hole penetrating portion 2 has, for example, a blow-out portion 2a and an escalator installation portion 2b in a plan view, and in a cross-sectional view, for example, it penetrates the fourth floor F4 and the third floor F3 from the ceiling surface to form the second floor F2. It is installed to reach the floor.

Handrails 4a and 4b are installed at positions adjacent to the vertical hole penetrating portion 2 on the floor surfaces of the third floor F3 and the fourth floor F4. In addition, a skylight part 5 is installed above the vertical hole penetrating part 2 in the ceiling layer TE, so that outside light can be taken into each floor in the blown-out building 1 through the skylight part 5 and the vertical hole penetrating part 2. Has become.

Next, an example of a method for constructing the top end portion of the blow-out structure 1 of the present embodiment will be described with reference to FIGS. 4 to 41.

4 is a plan view of a main part of the blown-out structure at the time of installing the temporary column which is one step of the method for constructing the top end of the blown-out structure of FIG. 1, and FIG. 5 is a main part of the line I-I in FIG. FIG. 6 is a sectional view and FIG. 6 is an enlarged perspective view of the unit girder member shown in FIG. In this example, the right side of the vertical hole penetrating portion 2 is the starting side and the left side of the vertical hole penetrating portion 2 is the arrival side.

First, as shown in FIG. 4, a plurality of temporary columns (first temporary column, second temporary column) 6 are fixedly installed on the floor surface of the uppermost 4-level F4. The temporary columns 6 are arranged at predetermined positions along the vertical direction in FIG. 4 at positions adjacent to the vertical hole penetrating portion 2 on both the starting side and the arriving side. The plurality of temporary columns 6 adjacent to each other in the vertical direction of FIG. 4 are connected to each other by a steel single pipe 7 connected to the legs thereof. As a result, it is possible to prevent the plurality of temporary columns 6 from swinging on each of the starting side and the arriving side. In addition, as shown in FIGS. 4 and 5, the temporary columns 6 arranged in the left-right lateral direction are installed so as to face each other with the vertical hole penetrating portion 2 interposed therebetween.

Further, as shown in FIG. 5, the temporary pillar 6 is installed outside the handrail portion 4b (position farther from the vertical hole penetrating portion 2 than the handrail portion 4b). Each temporary column 6 has a height changing portion 6j provided on its leg and a column portion 6h installed on it. The height changing portion 6j of each temporary pillar 6 is formed of, for example, a jack or the like, and the height of each temporary pillar 6 is set to be higher than that of the handrail portion 4b. The column portion 6h of each temporary column 6 has, for example, a truss structure configured by connecting steel pipes. As a result, the temporary column 6 can be made light and durable.

Further, a plurality of unit girder members U are carried to the fourth floor F4. The unit girder member U is a basic member for forming a bridge girder main body portion and a balance portion, which will be described later, and is configured by connecting steel pipes, for example, like the strut portion 6h of the temporary column 6 described above. Have a truss structure. That is, as shown in FIG. 6, the unit girder member U has a main pipe Pm, a sub pipe Ps, and a truss pipe Pt. The main pipes Pm are arranged parallel to each other at each corner of the quadrangle. The sub-pipe Ps is arranged so as to be orthogonal to the main pipe Pm, and is connected near both ends in the longitudinal direction (axial direction) of each main pipe Pm so as to connect the main pipes Pm adjacent to each other. There is. The truss pipe Pt is connected so as to draw a substantially triangular shape in a plane formed by a pair of main pipes Pm adjacent to each other and a pair of sub pipes Ps connecting them. With such a truss structure, the unit girder member U can be made light and durable. The diameter of each pipe is not particularly limited, but is, for example, 48.6 mm as in the case of a single pipe.

Further, for example, circular flange portions Pf in a plan view are formed on both end surfaces in the longitudinal direction of the main pipe Pm of the unit girder member U. Each of the flange portions Pf is provided with four bolt holes Ph that penetrate in the thickness direction. When joining a plurality of unit girder members U, the flange portions Pf of the main pipe Pm of each unit girder member U are abutted with the bolt holes Ph aligned with each other, and the bolt holes Ph of both flange portions Pf are joined. A bolt (not shown) is passed through and a nut (not shown) is used to stop the connection. However, the joining of the unit girder members U is not limited to using bolts and nuts, and various modifications such as using clamps are possible. Thereby, the unit girder members U can be easily connected to each other or the connection can be released.

The weight of the unit girder member U is a weight that can be carried manually, and is not particularly limited, but is, for example, about 50 kg. The length of the unit girder member U in the axial direction of the main pipe Pm is not particularly limited, but is, for example, about 2 m. The axial length of the sub-pipe Ps of the unit girder member U is not particularly limited, but is, for example, about 450 mm. Therefore, the unit girder member U can be lifted and lowered by a general elevator or the like. Further, the operator can carry the unit girder member U by a simple carrying means such as the carts 8A and 8B shown in FIG. 5 without using heavy equipment.

The two carts 8A and 8B have exactly the same configuration. That is, the trucks 8A and 8B have small wheel portions (moving means) 8cy of legs, a height changing portion 8j installed thereon, and a column portion 8h installed thereon. The height changing portions 8j of the carriages 8A and 8B are configured by, for example, jacks, and the height of the carriages 8A and 8B is higher than that of the handrail portion 4b and is the same as or slightly higher than the height of the temporary pillar 6. Is set. The pillar portions 8h of the trucks 8A and 8B have the same truss structure as the pillar portions 6h of the temporary pillar 6 and the unit girder member U described above. As a result, the pillar portions 8h of the carts 8A and 8B can also be made light and durable. The height changing portion 8j of the carriages 8A and 8B can be omitted.

Further, here, for example, the pillar portion 6h of the temporary pillar 6 and the pillar portion 8h of the carriages 8A and 8B are configured by the unit girder member U described above. For this reason, since the diameters of the pipes of the support columns 6h and 8h and the unit girder member U are the same, when the unit girder member U is temporarily fixed to the support columns 6h and 8h as will be described later, the support columns 6h and 8h and the unit girder member The member U can be easily connected or disconnected by a connecting member having a simple structure such as a clamp.

Next, the step of forming the bridge girder main body, which is one step of the method for constructing the top end of the blow-out structure after the step of FIG. 4, will be described with reference to FIGS. 7 to 11. 7 to 11 are sectional views of a portion corresponding to the line II in FIG. 4 in the step of forming the bridge girder main body.

First, as shown in FIG. 7, after connecting two unit girder members U with bolts and nuts (not shown), the two unit girder members (first unit girder members) U are trolleyed (first). 1 transportation means) 8A is mounted on the column 8h of the carriage 8A, and the two unit girder members U and the column 8h of the carriage 8A are temporarily fixed by a clamp or the like. Subsequently, the two unit girder members U are carried by the carriage 8A to the temporary column 6 on the starting side, and the tip ends of the two unit girder members U are placed on the temporary column 6 on the starting side and clamped on the starting side with a clamp or the like. Temporarily fixed to the temporary pillar 6. As a result, the two unit girder members U are supported by the temporary pillar 6 on the start side and the carriage 8A.

Subsequently, one unit girder member (second unit girder member) U is placed on the column portion 8h of the carriage (second transportation means) 8B, and one unit girder member U and the column portion 8h of the carriage 8B. After temporarily fixing and with a clamp or the like, one unit girder member U is carried to the rear end of two unit girder members U by the carriage 8B. Then, as shown in FIG. 8, one unit girder member U supported by the truck 8B is bolted to the rear ends of the two unit girder members U supported by the temporary column 6 on the start side and the truck 8A. And a nut (not shown). Thus, the three unit girder members U are supported by the temporary pillar 6 on the start side and the carriage 8B, and the temporary fixing of the carriage 8A and the unit girder member U is released.

Next, as shown in FIG. 9, one unit girder member U is placed on the column 8h of the truck 8A, and one unit girder U and the column 8h of the truck 8A are temporarily fixed by a clamp or the like. The carriage 8A conveys one unit girder member U to the rear ends of the three unit girder members U. Then, as shown in FIG. 10, one unit girder member U supported by the carriage 8A is bolted to the rear ends of the three unit girder members U supported by the temporary pillar 6 on the start side and the carriage 8B. And a nut (not shown). Thus, the four unit girder members U are supported by the temporary pillar 6 on the start side and the carriage 8A, and the temporary fixing of the carriage 8B and the unit girder member U is released.

Next, one unit girder member U is placed on the column 8h of the carriage 8B, and one unit girder member U and the column 8h of the carriage 8B are temporarily fixed by a clamp or the like, and then one unit girder 8B is used. The unit girder member U is carried to the rear ends of the four unit girder members U. Then, as shown in FIG. 11, one unit girder member U supported by the carriage 8B is bolted to the rear ends of the four unit girder members U supported by the temporary pillar 6 on the start side and the carriage 8A. And a nut (not shown) are connected to release the temporary fixing between the carriage 8A and the unit girder member U. In this way, the bridge girder main body portion (bridge girder) 10A including the plurality of unit girder members U is formed.

Next, the step of forming the balance portion, which is one step in the method for constructing the top end portion of the blown-out building after the step of FIG. 11, will be described with reference to FIGS. 12 and 13. 12 and 13 are cross-sectional views of a portion corresponding to the line I-I of FIG. 4 in the step of forming the balance portion after the step of FIG. 11.

First, as shown in FIG. 12, one unit girder member U is placed on the support column 8h of the truck 8A, and one unit girder member U and the support column 8h of the truck 8A are temporarily fixed by a clamp or the like. , One unit girder member U is carried by the carriage 8A to the rear end of the bridge girder body 10A supported by the temporary pillar 6 on the start side and the carriage 8B. After that, one unit girder member U supported by the carriage 8A is connected to the rear end of the bridge girder main body 10A with bolts and nuts (not shown).

After that, by repeating the same operation as the step of forming the bridge girder main body 10A, as shown in FIG. 13, the balance portion 10B having a plurality of unit girder members U is formed at the rear end of the bridge girder main body 10A.

The balance portion 10B is a counterweight for supporting the bridge girder main body 10A from the starting side when the bridge girder main body 10A is moved to the vertical hole penetrating portion 2 side. That is, when the bridge girder main body 10A is moved to the vertical hole penetrating portion 2 side and the tip of the bridge girder main body 10A reaches the center of the span of the vertical hole penetrating portion 2, the tip portion of the bridge girder main body 10A protruding into the vertical hole penetrating portion 2 is reached. As the bridge becomes heavier, the tip portion of the bridge girder main body 10A tilts downward. At this time, since the bridge girder main body 10A cannot be supported from below by the vertical hole penetrating portion 2, it is necessary to support the bridge girder main body 10A on the starting side and balance the bridge girder main body 10A so as not to tilt. The balance section 10B is a weight for achieving the balance. In the present embodiment, the balance portion 10B can be formed by extending the step of forming the bridge girder main body portion 10A, so that the work can be simplified.

In this example, the truck 8B (or the truck 8A) used to carry the last unit girder member U is also used as a part of the balance portion 10B. As a result, the number of unit girder members U required to form the balance portion 10B can be reduced by one, so that the overall lateral length of the balance portion 10B can be shortened. Therefore, even if it is not possible to secure a sufficient space for assembling the balance portion 10B having the same size as the bridge girder body portion 10A on the starting side, the balance portion 10B can be arranged.

Further, the balance section 10B may be configured by a weight separately prepared. In this case, the balance section 10B may be configured by the unit girder member U and a weight separately prepared, or the balance section 10B may be entirely configured by only the separately prepared weight. As a result, the balance portion 10B can be arranged even when a sufficient space cannot be secured on the starting side.

Next, the step of forming the bridge girder installation body, which is one step in the method of constructing the top end portion of the blow-out building after the step of FIG. 13, will be described with reference to FIGS. 14 to 19. 14 is a plan view of a main part of a blow-through structure in the process of preparing the movement of the bridge girder main body and the balance part after the process of FIG. 13, FIG. 15 is a cross-sectional view of the main part of the line I-I of FIG. 14, and FIG. 17 is a cross-sectional view of the main parts of the blow-through structure during the moving process of the bridge girder main body and the balance part after the process of FIG. 17, FIG. 17 is a plan view of the main parts of the blow-out structure after the process of FIG. 16, and FIG. FIG. 19 is a main-portion cross-sectional view taken along line I, and FIG. 19 is a main-portion cross-sectional view taken along line II-II in FIG.

First, as shown in FIGS. 14 and 15, a single pipe (single member) 10C is connected to the tip of the bridge girder main body 10A. The single pipe 10C is made of one steel pipe lighter than the unit girder member U, and is installed so as to protrude by a predetermined length from the tip of the bridge girder main body 10A. Thereby, the bridge girder installation body 10 including the single pipe 10C, the bridge girder main body 10A, and the balance part 10B is formed.

Further, as shown in FIG. 15, the carriage 8A is arranged at the center of gravity of the bridge girder installation body 10, and the unit girder member U of the bridge girder installation body 10 and the column portion 8h of the carriage 8A are connected and temporarily fixed by a clamp or the like. The dolly 8A serves as a fulcrum for weight-balancing the bridge girder main body 10A (five unit girder members U) and the single pipe 10C, and the balance part 10B (four unit girder members U and dolly 8B). This dolly 8A is arranged so as to be located in front of the temporary column 6 on the starting side when at least the single pipe 10C reaches the temporary column 6 on the arrival side. Prior to the movement of the bridge girder installation body 10, a fall prevention net (not shown) may be installed so as to cover the vertical hole penetrating portion 2 below the bridge girder installation body 10 during movement.

Subsequently, the temporary fixing of the unit girder member U at the tip of the bridge girder installation body 10 (bridge girder main body portion 10A) and the temporary pillar 6 on the starting side is released, and the bridge girder installation body 10 is moved to the vertical hole penetrating portion 2 by the carriages 8A and 8B. Move towards. At this time, the bridge girder installation body 10 does not come into contact with the temporary column 6 on the starting side and moves right beside it. After that, as shown in FIG. 16, when the single pipe 10C reaches the temporary column 6 on the arrival side, the load of the bridge girder installation body 10 is supported by the temporary column 6 on the arrival side.

Then, the connection between the dolly 8A and the unit girder member U is released, and the dolly 8A is moved rearward (a direction away from the vertical hole penetrating portion 2). However, the rearward movement of the dolly 8A is such that when the bridge girder installation body 10 is moved until the tip of the bridge girder main body portion 10A is located on the tentative post 6 on the arrival side, the dolly 8A moves to the temporary post 6 on the start side. If the vehicle stops before the position (that is, the carriage 8A does not collide with the temporary pillar 6 on the starting side), it may be omitted. At this time, if the tip of the single pipe 10C is lower than the temporary column 6 or the handrail 4b on the arrival side, the height changing portion 8j of the carriage 8A is made higher or the height changing portion 8j of the carriage 8B is made lower. Then, you may adjust the height.

Subsequently, as shown in FIGS. 17 to 19, after moving the bridge girder installation body 10 further forward and placing the tip of the bridge girder main body 10A on the temporary pillar 6 on the arrival side and temporarily fixing the bridge girder main body 10A, The rear end is placed on the temporary column 6 on the starting side and temporarily fixed. After that, as shown in FIGS. 17 and 18, the single pipe 10C on the arrival side (see FIG. 16 and the like) is removed. In this way, one bridge girder main body portion 10A is installed so as to straddle the vertical hole penetrating portion 2.

Next, the step of forming the second bridge girder installation body after the step of FIG. 17 will be described with reference to FIGS. In this example, the bridge girder main body 10A, the second bridge girder main body 10A, the third bridge girder main body 10A, and the fourth bridge girder main body 10A are referred to in this order from the top in the plan view.

20 is a plan view of a main part of the blown-out building after the process of FIG. 17, FIG. 21 is a cross-sectional view of a main part of the I-I line of FIG. 20, and FIG. 22 is a plan view of the main part of the blown-out structure after the process of FIG. FIG. 23 is a cross-sectional view of the main part of the line III-III of FIG. 22, FIG. 24 is a plan view of the main part of the blown-out building after the process of FIG. 22, and FIG. 26 is a main-portion cross-sectional view taken along line III-III in FIG. 25, and FIG. 27 is a main-portion cross-sectional view taken along line II-II in FIG.

First, as shown in FIGS. 20 and 21, a bridge girder with the entire balance part 10B at the rear end of the first bridge girder body 10A (an assembly of a plurality of unit girder members U) supported by carriages 8A and 8B. Remove from the main body 10A. Then, the aggregate of the plurality of unit girder members U is carried by the carriages 8A and 8B to the second bridge girder main body installation position. After that, as shown in FIG. 22 and FIG. 23, the tips of the aggregates of the plurality of unit girder members U are placed on the temporary pillar 6 on the starting side at the second bridge girder main body installation position and temporarily fixed, The aggregate of the unit girder members U of 1 is supported by the temporary pillar 6 on the starting side and the carriage 8B.

Next, one unit girder member U is placed on the column 8h of the truck 8A, and one unit girder U and the column 8h of the truck 8A are temporarily fixed by a clamp or the like, and then one unit girder member The U is carried to the rear end of the assembly of the unit girder members U. Subsequently, one unit girder member U supported by the carriage 8A is connected to the rear end of the assembly of the plurality of unit girder members U with bolts and nuts (not shown). After that, the same work as that of the first bridge girder installation body 10 is performed to form the bridge girder main body 10A on the second starting side as shown in FIG. As described above, in the present embodiment, the aggregate of the plurality of unit girder members U used as the balance portion 10B in the first bridge girder main body installation portion is used as it is as the bridge girder main body portion 10A in the second bridge girder main body installation portion. It is possible to simplify the installation work of the second and later bridge girder main body portions 10A. Further, the installation work time of the second and later bridge girder main body portions 10A can be shortened.

Next, after forming the balance portion 10B at the rear end of the second bridge girder main body 10A in the same manner as described above, the single pipe pipe 10C is connected to the tip end of the bridge girder main body 10A in the same manner as described above to form the bridge girder installation body 10. Form. Then, the bridge girder installation body 10 is moved from the starting side to the arrival side in the same manner as above, and the second bridge girder main body 10A is installed. By repeating such work at other bridge girder main body installation positions, as shown in FIGS. 25 to 27, a plurality of bridge girder main body portions 10A are installed so as to straddle the vertical hole penetrating portion 2. Note that, as shown in FIG. 25, the balance portion 10B used last can be used when disassembling a plurality of bridge girder main body portions 10A, and thus may be left as it is. However, if there is no place to store the balance section 10B, it is disassembled into individual unit girder members U and stored.

Next, the installation process of the work floor and the temporary scaffolding, which is one process of the method for constructing the top end portion of the blow-out structure after the process of FIG. 25, will be described with reference to FIGS. 28 to 31. 28 is a plan view of a main part of the blown-out building after the installation process of the work floor after the process of FIG. 25, FIG. 29 is a cross-sectional view of the main part of the line I-I of FIG. 28, and FIG. 31 is a cross-sectional view of the main part of the line, and FIG. 31 is a cross-sectional view of the main part of the part corresponding to the line II of FIG. 28 after the step of FIG. 28.

After the plurality of bridge girder main body portions 10A are installed on the vertical hole penetrating portion 2 as described above, the work floor 16 is installed so as to span the plurality of bridge girder main body portions 10A as shown in FIGS. 28 to 30. In addition, the code|symbol Cw of FIG. 29 has shown the curtain for blindfold.

Subsequently, as shown in FIG. 31, a movable temporary scaffold 17 is installed on the work floor 16. After that, the worker rides on the temporary scaffold 17 and replaces the skylight part 5 as an example of construction of the top end part.

Next, the dismantling process of the temporary scaffolding, which is one process of the method for constructing the top end portion of the blow-out structure after the process of FIG. 31, will be described with reference to FIGS. 32 to 41. 32 is a plan view of a main part of the blow-out structure during the dismantling process of the temporary scaffold, FIG. 33 is a cross-sectional view of the main part of the IV-IV line of FIG. 32, and FIG. 34 is a dismantling process of the temporary scaffold after the process of FIG. 32. FIG. 35 is a plan view of the main parts of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 34.

First, after removing the temporary scaffold 17 and the work floor 16 shown in FIG. 31 in order, as shown in FIG. 32 and FIG. 33, the bridge girder main body 10A (here, the fourth bridge girder main body 10A of FIG. 32) to be removed. ) Is connected to the single pipe 10C and the balancer 10B is connected to the rear end of the bridge girder main body 10A to form the bridge girder installation body 10. At this time, the balance portion 10B (an assembly of a plurality of unit girder members U (see FIG. 25)) used when the bridge girder main body portion 10A is installed on the vertical hole penetrating portion 2 is used as it is. As a result, it is possible to shorten the removal work time of the bridge girder main body 10A, as compared with the case where the unit girder members U are connected one by one to form the balance portion 10B.

Further, as shown in FIG. 33, the trucks 8A and 8B are arranged at the front and rear ends of the balance portion 10B at the rear end of the bridge girder main body portion 10A to be removed, and the unit girder member U and the trucks 8A and 8B of the balance portion 10B are arranged. The column portion 8h is connected with a clamp or the like and temporarily fixed. The dolly 8A is arranged as close as possible to the temporary column 6 on the starting side at the time of installation. Then, after disconnecting the connection between the front and rear ends of the bridge girder body 10A and the temporary columns 6 and 6 on the starting side and the reaching side, as shown in FIG. 34, the bridge girder installation body 10 from the reaching side to the starting side ( 34) to the right) and stop when the single pipe 10C is positioned on the temporary column 6 on the arrival side.

Next, as in the case shown in FIG. 16, the connection state between the carriage 8A and the balance portion 10B is released, and the carriage 8A is moved forward (leftward in FIG. 16). This is because the carriage 8A is arranged at the center of gravity of the bridge girder installation body 10. Therefore, if the carriage 8A can be arranged at the center of gravity of the bridge girder installation body 10 from the beginning (stage of FIG. 33), this work is unnecessary. Subsequently, as shown in FIG. 35, the balancer part 10B on the starting side further moves toward the starting side (to the right in FIG. 35) from the reaching side while supporting the bridge girder installation body 10. The cross section taken along the line IV-IV of FIG. 35 is the same as that of FIG. In this way, the fourth bridge girder body 10A is moved to the starting side.

Next, FIG. 36 is a cross-sectional view of an essential part of a portion corresponding to the line IV-IV of FIG. 35 after the step of FIG. 35, and FIG. 37 is a sectional view of a portion corresponding to the line IV-IV of the figure after the step of FIG. 38 is a main-portion plan view of the blow-out building after the step of FIG. 37, and FIG. 39 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV of FIG. 38 after the step of FIG. 38. 40 is a plan view of the main parts of the blown-out building after the process of FIG. 39, and FIG. 41 is a plan view of the main parts of the blown-out structure after the process of FIG. 40.

First, after removing the single pipe 10C at the tip of the fourth bridge girder main body 10A shown in FIG. 35 and temporarily fixing it to the temporary column 6 on the starting side, as shown in FIG. 36, the bridge girder installation body 10 (FIG. 15), the connection state between the bogie 8A located near the center of gravity and the balance portion 10B is released, and the bogie 8A is moved to the lower center of the second unit girder member U from the rear end of the balance portion 10B. Subsequently, after the truck 8A is connected to the unit girder member U and temporarily fixed, as shown in FIG. 37, the unit girder member U at the rear end of the balance portion 10B is separated while being supported by the truck 8B. At this time, the plurality of unit girder members U of the fourth bridge girder main body 10A and the balance portion 10B are supported by the temporary column 6 and the carriage 8A. Then, as shown in FIG. 38, the unit girder member U supported by the carriage 8B is carried to the rear end of the third bridge girder main body 10A and connected to the rear end of the third bridge girder main body 10A.

Next, as shown in FIG. 39, the carriage 8B carrying the unit girder member U to the third bridge girder main body 10A is moved to the second end from the rear end of the plurality of unit girder members U at the rear end of the fourth bridge girder main body 10A. The unit girder member U is moved to the lower center. Subsequently, the truck 8B is connected to the unit girder member U and temporarily fixed, and then the fourth and last unit girder member U is cut off while being supported by the truck 8A, and as shown in FIG. It is carried to the unit girder member U connected to the rear end of the third bridge girder body 10A and connected to the unit girder member U.

By repeating such work, as shown in FIG. 41, the unit girder member U is connected to the rear ends of the plurality of bridge girder main body portions 10A to form the balance portion 10B. Then, similarly to the above, each of the plurality of bridge girder body portions 10A is moved from the arrival side to the start side and removed. The cross section taken along the line VV of FIG. 41 is the same as that of FIG.

As another method, for example, the following can be performed. That is, after the state shown in FIG. 39, the unit girder member U on the dolly 8A is lowered, and the dolly 8A is moved below the unit girder member U in front of the dolly 8B (on the side of the vertical hole penetrating portion 2) to obtain the unit girder. After connecting the member U and the carriage 8A, the unit girder member U on the carriage 8B is separated and then lowered. By repeating such work, the entire balance part 10B and a part of the bridge girder body part 10A are disassembled, and the bridge girder body part 10A has the same length as the balance part 10B (the number of unit girder members U of the bridge girder body part 10A is balanced. When the number of unit girder members U for forming the portion 10B is reached, the temporary fixing to the fourth temporary pillar 6 is removed, and the third girder main body portion 10A is moved to the rear and joined. After that, the third bridge girder body 10A is moved and disassembled in the same manner as described above.

In addition, although the case where two bogies are used is described here, by using four bogies, two bridge girder installation bodies 10 (for example, the first and fourth bridge girder installation bodies) are obtained in the same manner as above. Since it is possible to dismantle at the same time in 10), the construction period for dismantling the bridge girder main body 10A can be halved.

As described above, in the present embodiment, the temporary scaffold 17 is not assembled from the floor of the vertical hole penetrating portion 2 at the time of construction of the top end portion of the blown-out building 1, but is assembled from the uppermost floor, so It is possible to shorten the construction period for the top end of No.1. Further, the number of parts of the temporary scaffold 17 can be reduced, and since the heavy equipment is not used for installing the work floor, the construction cost of the top end portion of the blow-out structure 1 can be reduced. Moreover, these effects do not change even if the number of layers through which the vertical hole penetrating portion 2 penetrates increases.

Further, since the temporary scaffolding 17 is assembled only on the uppermost floor during the construction of the roof portion of the blown-out building 1, the rooftop portion of the blown-out building 1 can be installed without hindering the use of traffic on lower floors than the top floor. Construction can be carried out.

In addition, during the construction of the roof of the open-air structure 1, temporary scaffolds and heavy equipment are not installed on the floor of the open-air structure 1, so it is not possible to install temporary scaffolds or heavy equipment for structural reasons. Even in the case, the work of the top can be carried out.

Further, since the bridge girder main body portion 10A and the balance portion 10B can be formed and removed only with the two carriages 8A and 8B, the work area can be simplified. Also, the cost of temporary scaffolding can be reduced.

(Second embodiment)

In the present embodiment, a modified example of the disassembling process of a plurality of bridge girder main body parts will be described with reference to FIGS. 42 to 48. The steps up to FIG. 35 are the same as those in the first embodiment.

42 is a main-portion cross-sectional view of a portion corresponding to the line IV-IV in FIG. 35 after the step of FIG. 35, and FIG. 43 is a main-portion cross-section of the portion corresponding to the line IV-IV in FIG. 35 after the step of FIG. FIG. 44 is a plan view of a main part of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 43, and FIG. 45 is a main part of a portion corresponding to the line IV-IV of FIG. 44 after the process of FIG. 44. 46 is a cross-sectional view, FIG. 46 is a plan view of a main part of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 45, and FIG. 47 is a view of a portion corresponding to the line VV of FIG. 46 after the process of FIG. 48 is a plan view of a main part of the blow-out structure during the dismantling process of the temporary scaffolding after the process of FIG. 47.

First, as described in the above embodiment with reference to FIG. 35, after moving the bridge girder main body portion 10A and the balance portion 10B to the starting side, the single pipe 10C is removed. Subsequently, as shown in FIG. 42, after the carriage 8A is moved below the unit girder member U at the tip of the balance portion 10B, the unit girder member U at the tip of the balance portion 10B and the carriage 8A are connected. Further, a dolly 8C is arranged below the center of the unit girder member U at the rear end of the bridge girder main body 10A and connected to the unit girder member U. The structure of the carriage 8C is the same as that of the carriages 8A and 8B.

Next, as shown in FIG. 43, the bridge girder main body portion 10A and the balance portion 10B are separated. In this case, the bridge girder main body 10A is supported by the temporary pillar 6 on the starting side and the carriage 8C, and the balance portion 10B is supported by the carriages 8A and 8B. Subsequently, with the balance portion 10B supported by the carriages 8A and 8B, as shown in FIG. 44, the balance portion 10B is carried to the rear end of the second bridge girder main body portion 10A and connected. Thereby, the balance portion 10B is formed at the rear end of the second bridge girder body portion 10A. Although the fourth balance portion 10B is connected to the rear end of the second bridge girder body portion 10A here, the invention is not limited to this, and the rear portion of any of the first to third bridge girder body portions 10A. You may connect to the end. Further, the balance portion 10B connected to the second bridge girder body portion 10A is supported by the temporary pillar 6 and the carriage 8B.

Next, as shown in FIG. 45, the carriage 8A is moved to and connected under the unit girder member U at the tip of the fourth bridge girder main body 10A. Subsequently, after releasing the connection state between the tip of the fourth bridge girder main body 10A and the temporary pillar 6, the fourth bridge girder main body 10A is supported by the carriages 8A and 8C, as shown in FIG. 46. Carry and connect to the rear end of the third bridge girder body 10A. In addition, here, the fourth bridge girder main body 10A is connected to the rear end of the third bridge girder main body 10A, but it is not limited to this, and any of the first to third bridge girder main body 10A is connected. You may connect to the rear end. The fourth bridge girder body 10A connected to the third bridge girder body 10A is supported by the temporary pillar 6 and the carriage 8C.

Next, as shown in FIG. 47, the carriage 8A at the tip of the fourth bridge girder body 10A connected to the rear end of the third bridge girder body 10A is moved to the lower center of the second unit girder member U from the rear end. Then, as shown in FIG. 48, the rearmost unit girder member U of the plurality of unit girder members U connected to the rear end of the third bridge girder body 10A is disconnected, and the first bridge girder is separated by the carriage 8C. It is carried and connected to the rear end of the main body 10A. Thereby, the balance portion 10B is formed at the rear end of the third bridge girder body portion 10A.

Then, similarly to the above-described embodiment, the carriage 8C is moved to the center of gravity of the third bridge girder installation body, and the third bridge girder main body 10A is moved from the arrival side to the start side. Then, similarly to the above-mentioned embodiment, the carriage 8C is moved to the center of gravity of the second bridge girder installation body, and the second bridge girder main body 10A is moved from the arrival side to the start side.

After that, the second and third unit girder members U are moved to the first position to form the balance part 10B, and similarly, the first girder main body part 10A is moved from the reaching side to the starting side, and all bridge girders are moved. The main body 10A is removed.

As described above, in the present embodiment, when the plurality of bridge girder main body portions 10A installed on the vertical hole penetrating portion 2 are removed, each bridge girder main body portion 10A is moved by moving the assembly of the plurality of unit girder members U in a connected state. By forming the balance portion 10B at the rear end, compared with the case where the unit girder members U are connected one by one to form the balance portion 10B, the work time for removing the plurality of bridge girder main body portions 10A can be shortened. You can

Although the invention made by the inventor has been specifically described based on the embodiments, the embodiments disclosed in the present specification are exemplifications in all respects, and are limited to the disclosed technology. is not. That is, the technical scope of the present invention should not be interpreted restrictively based on the description of the above-mentioned embodiment, but should be interpreted according to the description of the claims to the last. All modifications are included without departing from the scope of the claims and the technology equivalent to the described technology.

For example, in the above-described embodiment, the case where the bridge girder installation bodies (bridge girder main body) are erected one by one has been described, but the present invention is not limited to this, and several bridge girder installation bodies (bridge girder main body) can be simultaneously installed. The bridge girder installation body (bridge girder main body) may be installed at the same time. As a result, it is possible to shorten the work time for constructing the bridge girder main body.

Moreover, in the said embodiment, although the bridge girder main body part was demonstrated along the long side direction of a vertical hole penetration part (namely, so as to be orthogonal to the short side of a vertical hole penetration part), it explained. When there is a room in the work space, it is preferable to install a plurality of bridge girder main body parts along the short side direction of the vertical hole penetrating portion (that is, so as to be orthogonal to the long side of the vertical hole penetrating portion).

Further, in the above-described embodiment, the case where the invention is applied to the repair work of the roof end portion of the blow-out building has been described, but the present invention is not limited to this, and is applied to a new construction work of the roof top portion of the blow-out structure, for example. You can also do it. In this case, if there is no handrail part adjacent to the vertical hole penetrating part, the temporary column is not necessary.

In addition, three or more height changing portions 8j and small wheel portions 8cy of the bogie 8 are prepared, and when assembling the first to third bridge girder main body portions 10A, the work is performed using three or more bogies 8 Then, at the time of the fourth assembly, the unit girder member U that has been used as the supporting column 8h of the bogie 8 may be used for the bridge girder main body 10A and the balance portion 10B by dismantling the minimum required two bogies. In this case, at the time of dismantling, conversely, three or more trucks 8 may be created by using the unit girder member U generated when the first bridge girder main body 10A and the balance portion 10B are dismantled.

In the above description, the case where the construction method of the roof end portion of the blow-out structure of the present invention is applied to the repair work of the skylight part, for example, the construction method of the ceiling plate or the lighting installed on the ceiling surface, etc. It can be applied to the construction method of the top end of various blown-out structures, such as electrical construction method.

1 Blown structure 2 Vertical hole penetrating part 2a Blowing part 2b Escalator installation part 3 Temporary column 4a, 4b Handrail part 5 Skylight part 6 Temporary column 6j Height changing part 6h Strut part 7 Single pipe 8A, 8B, 8C Truck 8cy Small Wheel section 8j Height change section 8h Strut section 10 Bridge girder installation body 10A Bridge girder main body section 10B Balance section 10C Single pipe pipe 16 Working floor 17 Temporary scaffolding F2 2 layer F3 3 layer F4 4 layer TE Ceiling layer U Unit girder member Pm Main pipe Ps Sub pipe Pt Truss pipe Pf Flange part Ph Bolt hole

Claims (13)

A process of installing a plurality of bridge girders that bridge the void space on the top floor of the void structure
Installing a work floor so as to span the plurality of bridge girders;
Installing a temporary scaffold on the work floor,
Carrying out construction of the top end of the blow-out structure on the temporary scaffold,
Removing the temporary scaffolding after construction of the top end,
Removing the work floor after removing the temporary scaffold,
Removing the plurality of bridge girders after removing the work floor,
A method for constructing the crown of a blow-out structure, characterized by having. The step of installing the bridge girder,
On the starting side on the floor surface of the uppermost floor, a plurality of unit girder members are connected in series along the longitudinal direction of the bridge girder to form the bridge girder having a length capable of bridging the blowout space. Process,
Connecting a balance part for supporting the bridge girder on the starting side to the rear end of the bridge girder when moving the bridge girder from the starting side toward the arrival side through the blowout space;
Installing the bridge girder so as to bridge the blowout space by moving the bridge girder and the balance portion from the starting side toward the arrival side,
The method for constructing a top end portion of a blow-through structure according to claim 1, further comprising: The step of forming the bridge girder comprises:
Installing a first temporary column at a position adjacent to the blow-out space on the starting side;
Installing a second temporary column at a position adjacent to the blow-out space on the arrival side;
On the starting side, the first unit girder member is carried to the first temporary column while being supported by the first carrying means, and the tip of the first unit girder member is placed on the first temporary column. A process of temporarily fixing,
On the starting side, a second unit girder member is supported by a second carrier on the rear end of the first unit girder member supported by the first temporary column and the first carrier. Carrying in a state and connecting the tip of the second unit girder member to the rear end of the first unit girder member;
On the starting side, the third unit girder member is provided at the rear ends of the first unit girder member and the second unit girder member supported by the first temporary pillar and the second transporting means. Carrying in a state of being supported by the first carrying means, and connecting the tip of the third unit girder member to the rear end of the second unit girder member;
The method for constructing a top end portion of a blow-out structure according to claim 2, further comprising: The top end portion of the blow-through structure according to claim 2, wherein the step of connecting the balance portion to the rear end of the bridge girder includes the step of connecting the plurality of unit girder members to the rear end of the bridge girder. Construction method. The step of forming the bridge girder and the step of connecting the balance portion to the rear end of the bridge girder,
Installing a first temporary column at a position adjacent to the blow-out space on the starting side;
Installing a second temporary column at a position adjacent to the blow-out space on the arrival side;
On the starting side, the first unit girder member is carried to the first temporary column while being supported by the first carrying means, and the tip of the first unit girder member is placed on the first temporary column. A process of temporarily fixing,
On the starting side, a second unit girder member is supported by a second carrier on the rear end of the first unit girder member supported by the first temporary column and the first carrier. Carrying in a state and connecting the tip of the second unit girder member to the rear end of the first unit girder member;
On the starting side, the third unit girder member is provided at the rear ends of the first unit girder member and the second unit girder member supported by the first temporary pillar and the second transporting means. Carrying in a state of being supported by the first carrying means, and connecting the tip of the third unit girder member to the rear end of the second unit girder member;
The method for constructing a top end portion of a blow-out structure according to claim 4, characterized in that: 6. The one of the first transport means and the second transport means, which transports the last unit beam member constituting the balance portion, is used as a part of the balance portion. Construction method for the top of the blown-out building. The step of moving the bridge girder and the balance portion from the starting side toward the reaching side,
Removing the temporary fixing between the first unit girder member and the first temporary column;
A step of arranging one of the first transportation means or the second transportation means that is not used as a part of the balance portion at the center of gravity of a bridge girder installation body including the bridge girder and the balance portion; ,
A step of moving the bridge girder installation body to the arrival side while supporting the bridge girder installation body by a transportation means arranged at the center of gravity of the bridge girder installation body;
After the tip of the bridge girder of the bridge girder installation body reaches the second temporary column, temporarily fixing the tip of the bridge girder to the second temporary column;
The method for constructing a top end portion of a blow-out building according to claim 6, further comprising: 7. The blow-out structure according to claim 6, further comprising a step of connecting a single member lighter than the unit girder member to the tip of the bridge girder on the starting side before moving the bridge girder and the balance portion. How to construct the crown. The step of moving the bridge girder and the balance portion from the starting side toward the reaching side,
Removing the temporary fixing between the first unit girder member and the first temporary column;
Of the first transportation means or the second transportation means, a transportation means not used as a part of the balance portion is used as a center of gravity of a bridge girder installation body including the single member, the bridge girder and the balance portion. The step of placing,
A step of moving the bridge girder installation body to the arrival side while supporting the bridge girder installation body by a transportation means arranged at the center of gravity of the bridge girder installation body;
After the tip of the bridge girder of the bridge girder installation body reaches the second temporary column, temporarily fixing the tip of the bridge girder to the second temporary column;
The method for constructing a top end portion of a blow-through structure according to claim 8, further comprising: The said 1st temporary column and the said 2nd temporary column have height changing means which changes the height of this temporary column, The any one of Claim 3, 5-9 characterized by the above-mentioned. How to construct the top of a skyscraper. The first transporting means and the second transporting means have a moving means and a height changing means installed on the moving means and changing a height of the moving means. The method for constructing the top end portion of the blow-through structure according to any one of 3, 5 to 10. The said unit girder member has a truss structure, The construction method of the top end part of the blow-through structure of any one of Claims 2-11 characterized by the above-mentioned. In the step of forming the next bridge girder of the plurality of bridge girders without disassembling the balance portion formed by connecting the plurality of unit girder members in the step of forming one bridge girder of the plurality of bridge girders, It is used as a bridge girder, The method for constructing the top end portion of a blow-out building according to any one of claims 4 to 12.

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