JP2000297476A - Building method for dome structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily construct a dome structure by simple and efficiently lifting a dome roof built on a floor slab into an upper space. SOLUTION: The building method for the dome structure constructs a dome roof, which has a domy shell surface section 12, a peripheral ring section 14 arranged on the outer circumference of the shell surface section 12 and PC steel materials 16 arranged along the circumferential direction of the peripheral ring section 14 as the dome roof 10 on a floor slab 20 and into which prestress in the circumferential direction is introduced by tensing and fixing the PC steel materials 16. The dome roof 10 into which prestress is introduced is lifted and supported in the upper space of the floor slab 20. A peripheral side wall 50 is built to the lower section of the lifted dome roof 10, and the peripheral side wall 50 and the dome roof 10 are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a building structure having a dome-shaped roof structure, such as a tank structure serving as a reservoir.

[0002]

2. Description of the Related Art A dome structure is characterized by a spherically-shaped dome roof such as a bowl. The dome roof is supported only by its outer peripheral edge and does not have a support structure such as a pillar on the center side, so the internal space can be widely used and effectively used. Such a dome structure is useful for a tank structure, a warehouse, or the like that contains a liquid or the like inside.

In the construction of a dome structure, a slab and a peripheral side wall are sequentially constructed on a construction surface, and then a dome roof is constructed on an upper portion of the peripheral side wall. In order to construct a dome roof without pillar support structure, a shoring or dome form that reaches the dome roof position is built in the inner space of the peripheral side wall, and these shoring and formwork are used. The construction work of the dome roof, such as arranging reinforcing bars and casting concrete, will be performed.

[0004] In such a method of constructing a dome roof, there is a problem that the supporting work and the work of erection of the formwork are extremely large, and the work time and work cost are increased. In addition, since the construction of the dome roof is all performed in an upper space away from the ground, there are many technical difficulties, and it is troublesome to secure the safety associated with working at heights. To solve these problems,
There has been proposed a method of constructing a dome structure by building a dome roof on the ground and then lifting the completed dome roof to above the peripheral side wall. If the dome roof is built on the ground, large-scale support work and formwork erection work are not required, and work can be performed efficiently and safely.

[0005] Japanese Patent Application Laid-Open No. 11-6325 discloses a method in which a dome roof constructed on a floor slab is lifted above a side wall via a cable by a lifting gantry installed at the top of the side wall.

[0006]

In the above prior art, it is necessary to construct the dome roof in an independent state that is not supported by the peripheral side walls, and to lift the constructed dome roof alone into the upper space. The strength of the dome roof must be sufficiently high. For this reason, it is necessary to increase the thickness of the concrete constituting the dome roof or to arrange a large number of reinforcing bars inside, and there is a problem that construction takes time and costs are high.

When the weight of the dome roof is increased in order to increase its strength, it is difficult to lift the dome roof from the ground to an upper space. In the above-described hanging method using a cable, a thick cable must be used, or the number of cables must be increased, and a large-scale facility is required.
Work efficiency also decreases. In addition, the cable suspension device has to be installed at the upper part of the peripheral side wall, that is, at a high place, and the operation requires time and cost. In order to support a heavy dome roof, it is necessary to increase the thickness and strength of the peripheral side wall, which also increases labor and cost.

In addition, the dome roof has a structure that, if its own weight is excessively increased, the structural strength is rather lowered and the load applied to the peripheral side wall is increased, so that the durability of the dome structure after construction is adversely affected. Therefore, an object of the present invention is to make it possible to easily and efficiently lift a dome roof constructed on a floor slab into an upper space, thereby facilitating construction of a dome structure.

[0009]

SUMMARY OF THE INVENTION A method of constructing a dome structure according to the present invention comprises a floor slab, a peripheral side wall erected on the floor slab, and a dome disposed above the peripheral side wall and covering the inside of the peripheral side wall. A method of constructing a dome structure having a roof and
It includes the following steps (a) to (c). On the floor slab, as a dome roof, having a dome-shaped shell surface portion, a peripheral ring portion arranged on the outer periphery of the shell surface portion, and a PC steel material arranged along the circumferential direction of the peripheral ring portion, Step (a) of constructing a dome roof in which circumferential prestress has been introduced by tensioning and fixing PC steel.

[0010] The dome roof into which prestress has been introduced is
Step (b) of lifting and supporting the space above the floor slab. (C) constructing a peripheral side wall below the lifted dome roof and connecting the peripheral side wall and the dome roof; [Dome structure] It can be applied to ordinary water distribution tanks, warehouses, stadiums, gatherings, exhibition halls, and other structures requiring a dome-shaped space.

The dome structure has a floor slab, a peripheral side wall, and a dome roof. In the case of a container-like structure such as a water distribution tank, a substantially closed space is formed. Depending on the purpose, an opening serving as a doorway for a person or an article may be provided in the dome roof or a part of the peripheral side wall. [Construction of Dome Roof] The structure of the dome roof can basically adopt the same shape and structure as those of the dome roof in a normal dome structure. The basic material of the dome roof is concrete, but steel materials, wood, synthetic resins, glass and the like can be used in combination.

The dome roof is composed of a dome-shaped shell surface constituting a so-called round roof, a circumferential ring portion arranged on the outer periphery of the shell surface portion, and a PC steel material arranged along the circumferential direction of the circumferential ring portion. Have. The shell surface portion usually has a curved surface shape obtained by cutting a part of a spherical surface, but even if it is not an exact spherical surface, it can be regarded as a substantially spherical surface, a curved surface shape other than a spherical surface, or a spherical surface. It may be a combination of shapes other than a spherical surface.

A steel material for prestressed concrete (hereinafter referred to as a PC steel material) is arranged in the circumferential direction along the circumferential direction, and is fixed in a state of being tensioned by applying a strong tensile force to the PC steel material. I do. As a result, the stress generated in the shell surface portion is in a state in which only the axial force acts, and it is only necessary to have a structure that can cope with only this axial force. The PC steel material may be embedded in the peripheral portion of the dome roof, or may be wound around the outer periphery of the peripheral portion. The strength of the prestress to be introduced varies depending on conditions such as the structure of the dome roof and the required strength. However, a compressive force corresponding to the own weight of the shell surface and the loaded load is introduced into the peripheral ring.

By employing such a prestress structure, the strength and durability of the dome roof are improved. As a result, the thickness of the dome roof, particularly the shell surface, can be reduced. Further, the number of reinforcing bars arranged on the dome roof can be reduced or the wire diameter can be reduced. The specific dimensions of the dome roof are
Depending on the overall dimensions of the dome structure,
The dome roof has a radius of 10 to 50m, and the shell has a thickness of 10
It is set to about 15 cm. This thickness is defined by the thickness of the structure of the shell surface portion, and does not include the thickness of the decorative mortar or paint applied for finishing the surface.

The dome roof can be constructed of cast-in-place concrete or a PC panel method using a precast concrete panel. In the case of cast-in-place concrete, a formwork corresponding to the shape of the dome roof is installed, reinforcing bars are arranged as necessary, and concrete is cast into the formwork. In the PC panel method, the entire shape of the shell surface of the dome roof is formed by combining a plurality of precast panels. The precast panel is obtained by dividing the approximate spherical shape of the shell surface portion into a plurality of fan surfaces in the circumferential direction, or by dividing the shell surface portion in the circumferential direction and dividing it into a plurality of stages in the radial direction.

Each precast panel is made of a concrete plate in which reinforcing bars are arranged vertically and horizontally. The precast panel may be produced at a factory and carried into a construction site, or may be manufactured by casting concrete on a panel formwork at the construction site. You may. When constructing the dome roof, a metal fitting used for lifting the dome roof, which will be described later, can be attached. It is preferable that the metal fitting is attached to the peripheral ring. [Dome Roof Lifting] The technique of lifting heavy objects in ordinary civil engineering and building technology can be applied. Lifting devices such as cranes and jacks are used.

The following method can be employed as a method for reliably and easily lifting a heavy dome roof to a predetermined position. At multiple locations along the outer periphery of the dome roof, erection jacks having a load receiver that supports the dome roof and can move up and down are arranged. The location of the erection jack is set outside or inside the floor slab, so as not to interfere with the construction of the peripheral side wall.

As the erection jack, a jack device for civil engineering driven by ordinary hydraulic pressure or the like is used. The number and arrangement of erection jacks are appropriately set according to the weight and structure of the dome roof. However, it is set so that the weight of the dome roof can be supported by at least a part, usually only half, of the erection jacks to be used. On the dome roof,
A receiving fitting can be provided at a position where the load receiving base of the erection jack abuts. The metal fitting is made of steel or the like.
The shape and arrangement of the fittings are set so that the loads on the entire dome roof can be supported by the fittings at a plurality of locations.

The working steps include the following steps (b-1) and (b-2)
Repeat (b-3). Step (b-1): At some of the erection jacks at a plurality of erection jacks, the load receiving stand is raised to lift the dome roof. The number of erection jacks for raising the load receiver can be arbitrarily set, and it is sufficient that at least one erection jack that does not raise the load receiver remains. Usually, half of the total number of erection jacks is used. In this case, every other erection jack arranged on the outer periphery of the dome roof may be used. The height at which the dome roof is lifted is set to the height of one or a plurality of post blocks described later.

Step (b-2): The support block is inserted between the load receiving pedestal and the dome roof with the erection jack without raising the load receiving pedestal, and the support block is fixed to the dome roof. The support block is made of a steel material such as a steel plate or a steel bar or an assembly of steel materials, and has a connection structure for connecting the support blocks to each other up and down. As the connection structure, a connection structure similar to that of a normal shoring or the like can be adopted, and a fastening structure using bolts, a fitting structure, and the like can be given. If the receiving structure of the dome roof is provided with the same connection structure as the support block, the support block can be easily fixed to the dome roof.

One or more support blocks are inserted for each erection jack to fill the gap between the dome roof and the load receiver. When inserting a plurality of support blocks, the support blocks arranged vertically are connected and fixed. Step (b-3): With the erection jack with the load cradle raised, lower the load cradle to provide a gap with the dome roof, insert a support block into this gap, and attach the support block to the dome roof. Fix it. The erection jack for lowering the load receiving table may be all the erection jacks raised in the previous process, or may be some of the erection jacks. If the erection jack with the load cradle raised is divided into multiple sets and this process is performed in order, finally, for all erection jacks, a support block will be placed between the load cradle and the dome roof. Will be inserted.

As a result of the above steps, the dome roof is supported on all the erection jacks via the support blocks. The dome roof will be lifted by the height of the inserted support block. By repeating the above steps (b-1), (b-2) and (b-3), the dome roof can be raised to a desired height and stably supported in that state. In this state, if a space for constructing the peripheral wall is provided inside the erection jack and the support block, the peripheral wall can be constructed while supporting the dome roof. [Construction of Peripheral Side Wall] A technique for constructing a peripheral side wall in a normal dome structure can be applied.

On-site construction in which a form is constructed at a construction site and concrete is poured into the form can be employed. It is also possible to adopt a method of assembling pre-manufactured precast panels, placing a thinning concrete in a gap between the panels, and joining and integrating them. Prestress can be introduced into the peripheral side wall in one or both of the circumferential direction and the axial direction.

After constructing the peripheral side wall, the peripheral side wall and the dome roof are joined and integrated. Specifically, the gap between the peripheral side wall and the dome roof may be filled with concrete casting or the like.
Reinforcing bars connecting the peripheral side wall and the dome roof can be arranged. Vertical prestress can be introduced between the peripheral side wall and the dome roof. Specifically, a PC steel material penetrating at least a part of the peripheral side wall and the dome roof is arranged, and both ends of the PC steel material are fixed to both the peripheral side wall and the dome roof in a state where tension is applied to the PC steel material. Good. P
Both ends of the C steel material can be fixed to the floor slab with the dome roof and the peripheral side wall interposed therebetween.

When the dome roof is supported by the peripheral side wall, the support structure of the dome roof such as the erection jack and the support block can be removed. For dome structures consisting of peripheral walls and dome roofs, finish mortar on the outer surface, install piping, electrical wiring, stairs and handrails for workers to climb, and other necessary equipment. The work is performed, and the construction of the dome structure is completed.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for constructing a dome structure whose schematic structure is shown in FIG. 1 will be described. The dome structure includes a circular floor slab 20, a cylindrical peripheral side wall 50 erected on the floor slab 20 along the outer periphery of the floor slab 20, and a substantially spherical slab disposed on the upper end of the peripheral side wall 50. And a dome roof 10. [Construction process of floor slab 20] The floor slab 20 is constructed basically in the same process as that of a normal dome structure.

More specifically, as shown in FIG. 2, the ground slab 20 is formed by digging a little into the ground, installing a formwork, arranging reinforcing steel if necessary, and casting concrete. .
On the outer periphery of the floor slab 20, an accommodation recess 22 for installing the erection jack 30 is formed. As shown in FIG. 3, accommodation recesses 22 are formed in the floor slab 20 for each of the erection jacks 30 arranged at a plurality of positions at equal intervals along the outer periphery of the dome roof 10.

The erection jack 30 is provided at its upper end with a load receiving table 32 which can move up and down. The load jack 32 at the upper end of the erection jack 30 accommodated in the accommodation recess 22 is arranged at the same position as or slightly above the upper surface of the floor slab 20. The load receiving table 32 is operated by hydraulic pressure so that the operation of the erection jacks 30 at a plurality of locations can be intensively controlled by a separately installed control device or the like. [Construction Step of Dome Roof 10] The dome roof 10 is constructed on the floor slab 20.

The dome roof 10 includes a curved shell portion 12 having a part of a spherical surface cut off, and a peripheral ring portion 14 surrounding the outer periphery of the shell surface portion 12 and being thicker than the shell surface portion 12. As shown in FIG. 3, the shell surface portion 12 having a planar circular shape is formed.
Is constituted by a plurality of substantially fan-shaped precast panels 12a obtained by dividing a circle in the circumferential direction. Each panel 12
Filling concrete 12b is cast at the vertex where the boundary of a and the tips of all the panels 12a gather.

As shown in FIG. 2, the peripheral ring portion 14 is
4b and the upper part 14a. This is because the lower surface 14b is formed by casting concrete, the shell surface portion 12 is formed thereon, and then the upper portion 14a is formed to complete the peripheral ring portion 14. By adopting such a structure, the shell surface portion 12 can be easily formed, the load on the shell surface portion 12 can be reliably supported by the peripheral ring portion 14, and the structural strength of the entire dome roof 10 is increased.

As shown in FIG. 3, a PC steel material 16 is embedded in the circumferential ring portion 14 along the circumferential direction. As shown in FIG. 2, a plurality of PC steel materials 16 are arranged vertically.
After the concrete of the circumferential ring portion 14 is cast and cured, the PC steel material 16 is tensioned by applying a strong tensile force in the axial direction, and so-called prestress is introduced. This prestress acts in the direction of compressing and shrinking the peripheral ring portion 14 and the inner shell surface portion 12 toward the center side, and opposes the force of deforming the shell surface portion 12 so as to expand to the outer peripheral side. Improve strength or durability.

In the construction work of the dome roof 10 described above,
Installing concrete formwork on floor slab 20,
For this purpose, works such as supporting works and installing scaffolds for work are performed. However, since the height of the dome roof 10 relative to the floor slab 20, that is, the ground, is at most as large as the bulging of the shell surface portion 12, the height of the support, the scaffolding, or the formwork may be relatively low, and the work is easy. Yes, it is easy to ensure worker safety.

If sand or clay is deposited on the floor slab 20 in a curved shape along the lower surface of the dome roof 10 to be constructed, instead of installing a shoring or a formwork, this deposit can be obtained. The dome roof 10 can be constructed by casting concrete in accordance with the curved surface of the above. On the outer peripheral side surface of the peripheral ring portion 14 of the dome roof 10, the metal fitting 3 against which the load receiving base 32 of the erection jack 30 installed in the concave portion 22 of the floor slab 20 abuts
4 is attached so as to project outward. [Step of Lifting Dome Roof 10] FIGS. 4 to 8 show steps of lifting the dome roof 10 stepwise.

As shown in FIG. 2, the work starts from a state in which the dome roof 10 is supported by a plurality of erection jacks 30. As shown in FIG. 4, the load receiving table 32 is raised by the erection jacks 30 which are arranged every other in the circumferential direction among the plurality of erection jacks 30. In the case of the arrangement shown in FIG. 3, the load receiving table 32 is raised by every other three installation jacks 30a among the six installation jacks 30, and the remaining three installation jacks 30b are not operated. The operation of the erection jack 30 is performed by controlling a control valve, a hydraulic pump, and the like of a hydraulic pipe to be supplied to each erection jack 30 according to a predetermined program. Hydraulic piping systems for driving are connected to each other so that the operations of the plurality of erection jacks 30 to be raised at the same time are linked.

The dome 10 supported by the load receiving table 32 via the metal fitting 34 is lifted upward. By controlling the operation amounts of the plurality of erection jacks 30 in a balanced manner, the roof dome 10 can be reliably lifted by a predetermined distance in a horizontal state. At the place of the erection jack 30b where the load receiving table 32 was not raised, the load receiving table 3
There is a gap between 2 and the receiving member 34.

As shown in FIG. 5, the support block 3 is provided in the gap between the load receiving table 32 of the installation jack 30b and the receiving member 34.
Insert 6. The support block 36 is made by assembling and joining steel materials, and has a large load resistance in the vertical direction. The support blocks 36 can be connected vertically by fastening means such as bolt connection. The metal fitting 34 also has a connection structure similar to that of the support block 36, and the support block 36 is fixed to the metal fitting 34 using this connection structure.

As shown in FIG. 6, the load receiving table 32 which has been raised by the erection jack 30a is lowered to the original position. The roof block 10 is supported by a load receiving stand 32 of the erection jack 30b via a support block 36. There is a gap between the load receiving table 32 of the erection jack 30a and the metal fitting 34 of the dome roof 10. As shown in FIG. 7, the support block 36 is inserted between the load receiving base 32 of the erection jack 30a and the receiving member 34, and the supporting column block 36 is attached to the receiving member 34.
Fixed to.

In this state, all the erection jacks 30a,
The load cradle 32 of 30b is located at the same height position, and one support block 36 is disposed between all the load cradle 32 and the metal fitting 34. The dome roof 10 has been lifted up by one post block 36. Next, as shown in FIG. 8, when the group of erection jacks 30 a is extended again, the dome roof 10 is lifted, and at the remaining erection jacks 30 b, the support block 36 is lifted up together with the metal fittings 34. , There is a gap with the load receiving table 32. This state is the same as the above-described state of FIG. 4 except that one support block 36 exists.

Thereafter, if the same operation as in FIGS. 4 to 7 is performed, two support blocks 36 are arranged between all the erection jacks 30a and 30b and the metal fittings 34, and the dome roof 10 is connected to the support blocks 36. Is lifted upward by two. By repeating such operations sequentially, any number of support blocks 36 can be inserted between the dome roof 10 and the erection jack 30, and the dome roof 10 can be raised to a desired height. Dome roof 1
Even if the position of 0 is increased, the work of inserting the support block 36 may be always performed at the position of the erection jack 30, so that the work can be performed easily and efficiently, and the safety of the operator can be easily secured.

As shown in FIG. 1, the dome roof 10 is raised to a position where a peripheral side wall 50 can be constructed below the dome roof 10. [Construction process of the peripheral side wall 50] In the state where the dome roof 10 is lifted to a predetermined height and supported, the dome roof 1
The peripheral side wall 50 is constructed in the space below 0. The construction work can be performed in the same manner as the construction of the peripheral side wall 50 in the normal dome structure.

In the embodiment shown in FIG. 1, a rectangular precast panel 52 made in advance is placed upright between the floor slab 20 and the dome roof 10 and arranged circumferentially.
A plurality of panels 52 are integrally joined to each other to form a peripheral side wall 50 by filling concrete between the gaps. When constructing the peripheral side wall 50, the structural strength of the peripheral side wall 50 is improved by embedding a PC steel material along the circumferential direction inside the peripheral side wall 50 and introducing the same pre-stress into the PC steel material. be able to. As the above-described panel 52, a panel in which a PC steel material is embedded in advance can be used.

After the peripheral side wall 50 is constructed, the peripheral side wall 50
If the dome roof 10 and the dome roof 10 are integrally joined by casting concrete or the like, a basic structural portion of the dome structure is completed. Peripheral side wall 50 and peripheral ring 1 of dome roof
Introducing a pre-stress also between the peripheral wall 5 and
0 and the peripheral ring portion 14, that is, the dome roof 10 can be made more integral. Specifically, as shown in FIG. 1, a PC steel material 54 that vertically penetrates the peripheral side wall 50 and the peripheral ring portion 14 may be arranged, and the PC steel material 54 may be fixed by applying a tensile force.

The support block 36 and the erection jack 30 supporting the dome roof 10 may be removed after the dome roof 10 and the peripheral side wall 50 are integrally joined. The metal fitting 34 attached to the outer periphery of the dome roof 10 is removed if it becomes unnecessary. The inside or outside of the dome structure is coated with mortar for finishing,
Finishing work such as installation of plumbing, work stairs, and handrails is performed to complete the dome structure.

[0044]

The method of constructing a dome structure according to the present invention uses a dome roof into which circumferential prestress has been introduced, so that even a relatively thin and lightweight dome roof has sufficient structural strength. This makes it easy and efficient to lift and support the dome roof in the space above the floor slab. The construction of the dome roof can be done on the ground,
The construction work of the dome roof is easy, and the safety of workers is also easily ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention and illustrating a construction state of a dome roof on the ground.

FIG. 2 is a plan view showing the structure of a dome roof.

FIG. 3 is a schematic process diagram showing a first stage of a dome roof lifting operation.

FIG. 4 is a schematic process chart showing a second stage of the dome roof lifting operation.

FIG. 5 is a schematic process diagram showing a third stage of the dome roof lifting operation.

FIG. 6 is a schematic process diagram showing a fourth stage of the dome roof lifting operation.

FIG. 7 is a schematic process diagram showing a fifth stage of the dome roof lifting operation.

FIG. 8 is a partially cutaway front view showing a construction work of the peripheral side wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dome roof 12 Shell surface part 14 Peripheral ring part 16 PC steel material 20 Floor slab 22 Housing concave part 30 Construction jack 32 Load receiving stand 34 Metal fittings

Claims (5)

[Claims] 1. A method for constructing a dome structure having a floor slab, a peripheral side wall erected on the floor slab, and a dome roof disposed on the peripheral side wall and covering the inside of the peripheral side wall, On the floor slab, the dome roof has a dome-shaped shell surface portion, a peripheral ring portion arranged on the outer periphery of the shell surface portion, and a PC steel material arranged along the circumferential direction of the peripheral ring portion. , PC
(A) constructing a dome roof in which circumferential prestress has been introduced by tensioning and fixing the steel material, and lifting the dome roof in which the prestress has been introduced into the space above the floor slab to support it (B) constructing a peripheral wall below the lifted dome roof, and (c) coupling the peripheral wall and the dome roof. 2. The method for constructing a dome structure according to claim 1, wherein said step (a) comprises assembling a precast concrete panel to construct a shell surface portion of a dome roof. 3. In the step (b), erection jacks having a load receiving base that supports the dome roof and can move up and down are arranged at a plurality of locations along the outer periphery of the dome roof. The process of raising the load receiving platform and lifting the dome roof with some of the erection jacks
(b-1) and inserting a support block between the load support and the dome roof with an erection jack that does not raise the load support, and fixing the support block to the dome roof (b-2). A step of lowering the load receiver and providing a gap between the load receiver and the dome roof, inserting a support block into the gap, and fixing the support block to the dome roof (b). 3. The method for constructing a dome structure according to claim 1, wherein the following is repeated. 4. The step (c) includes arranging a PC steel material vertically penetrating a peripheral side wall and a peripheral ring portion of the dome roof, tensioning and fixing the PC steel material, and perpendicularly interposing the peripheral side wall and the dome roof. The method for constructing a dome structure according to any one of claims 1 to 3, wherein a directional prestress is introduced. 5. The method for constructing a dome structure according to claim 1, wherein said dome structure is a PC tank.