JPH04276595A - Construction method for concrete container - Google Patents

Abstract

PURPOSE:To shorten a construction period for a reactor facility by ensuring a state for delivering machines and pipes, etc., to be arranged in a steel structure of an introduction space at the early stage of the construciton work for the top slab and arranging early the machines, etc., through the introduction space. CONSTITUTION:A top slab liner 13 put on a temporary lower beam 26 is hug down via a hanging part 28 from temporary upper beam 26 bridged between temporary pillers 23 and 25 on a reactor shield wall 2 and a concrete container 3, and the top slab liner 13 is also supported from the bottom by the temporary lower beam 26 to lay the top slab 14.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a concrete containment vessel for, for example, a nuclear power plant.

0002

2. Description of the Related Art As a conventional method for constructing a concrete containment vessel for a nuclear power plant or the like, there is a method as shown in FIG. 2, for example.

[0003] In this construction method, a reactor shield wall 2 and a concrete containment vessel wall 3 are erected on a floor surface 4, and are arranged concentrically with a reactor pressure vessel wall 1 at a predetermined distance from each other.
A steel structure 7 is constructed in the space formed between the reactor shield wall 2 and the concrete containment vessel wall 3, and piping 5 such as the main steam pipe of the reactor pressure vessel is introduced into the upper part of the space. An introduction space 6 is provided for carrying in, temporarily storing, and installing other equipment, and then a large number of temporary supports 8, 8 are erected within the introduction space 6 and on the steel structure 7 to carry out each temporary installation. A temporary beam 11 is installed horizontally between the outer peripheral surface 9 of the upper end of the reactor shield wall 2 and the inner peripheral surface 10 of the upper end of the concrete containment vessel wall 3 on the supports 8, 8, and then an end is installed on the temporary beam 11. A top slab liner 13 made of a steel plate whose part is connected to the concrete containment vessel wall 3 is placed, and then a top slab 14 is placed around the top slab liner 13 and the upper end of the concrete containment vessel wall 3 for pouring. After assembling the formwork 15 and arranging reinforcing bars 16 within the casting formwork 15, concrete 17 is poured and the top slab 14 of the concrete storage container is cast.

After pouring the top slab 14, not only the pouring formwork 15 but also the temporary supports 8, 8 and the temporary beam 11 temporarily installed in the introduction space 6 are removed, and the introduction space 6 is removed.
For example, the piping 5 of the reactor pressure vessel wall 1 is introduced from the reactor pressure vessel wall 1 and disposed within the steel structure 7.

In the figure, reference numeral 18 is a temporary bracket that supports the reactor pressure vessel side end of the temporary beam 11 fixed to the upper end outer peripheral surface 9 of the reactor shield wall 2, and reference numeral 19 is the reactor shield. A subrection jumper is shown, which is disposed in the lower space between the wall 2 and the concrete containment vessel wall 3 and serves as the base for constructing the steel structure 7.

[0006]

[Problems to be Solved by the Invention] However, in the conventional concrete containment vessel construction method, as described above, when placing the top slab liner 13, the reactor shield wall 2
In order to erect a large number of temporary supports 8, 8, which will not be removed until after the top slab 14 has been placed, in the introduction space 6 between the top slab 14 and the concrete containment vessel wall 3, Until the pillars 8, 8, etc. are removed, it is not possible to install, for example, the piping 5 of the reactor pressure vessel wall 1, which is installed inside the steel structure 7 via the introduction space 6, and the nuclear power Construction of power plants, etc. tended to take longer.

The present invention was developed in view of the above-mentioned circumstances, and is intended to ensure that equipment, piping, etc. to be installed inside a steel structure can be brought into the installation space at an early stage of top slab construction work. It is an object of the present invention to provide a method for constructing a concrete containment vessel, which enables early installation of the equipment and the like by passing through the introduction space, thereby shortening the construction period of a nuclear reactor facility.

[0008]

[Means for Solving the Problems] The present invention provides a method for erecting temporary supports on the reactor shield wall and the concrete containment vessel wall, which are arranged concentrically at a predetermined distance from each other, and between the temporary supports. While the upper beam is installed horizontally, a temporary lower beam is installed horizontally between the outer peripheral surface of the upper end of the reactor shield wall and the inner peripheral surface of the upper end of the containment vessel wall, and a top slab liner is installed on the temporary lower beam. and the lower end of the hanging material whose upper end is fixed to the temporary upper beam is fixed to the top slab liner to support the liner in a suspended state from the temporary upper beam, and then concrete is stored around the top slab liner. A formwork for pouring the top slab of the container is assembled, reinforcing bars are placed in the formwork, concrete is poured into the formwork, and the top slab is poured.

[0009]

[Operation] The concrete containment vessel construction method of the present invention is as follows:
First, temporary supports are erected on the reactor shield wall and the concrete containment vessel wall, which are arranged concentrically at a predetermined distance from each other, and then a temporary upper beam is horizontally installed between the temporary supports, while the reactor A temporary lower beam is laid horizontally between the outer circumferential surface of the upper end of the shield wall and the inner circumferential surface of the upper end of the containment vessel, a top slab liner is placed on the temporary lower beam, and then the liner is placed on the temporary upper side. After the top slab is supported in a suspended state from a beam, a formwork for pouring the top slab of the concrete containment vessel is assembled around the top slab liner, reinforcing bars are arranged within the formwork, and reinforcing bars are placed inside the formwork for pouring. The top slab is placed by pouring concrete.

[0010] In this way, the top slab liner placed on the temporary lower beam is suspended by the temporary upper beam, and the liner is also supported from below by the temporary lower beam to cast the top slab. This makes it possible to ensure that equipment, piping, etc. installed inside the steel structure can be brought into the introduction space at an early stage of top slab construction work, and as a result, the equipment can be transported through the introduction space. The construction period for nuclear reactor facilities can be shortened by allowing early installation of such facilities.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the figure, the same components as those shown in FIG. 2 are given the same reference numerals.

In the construction method of the concrete containment vessel according to the embodiment of the present invention, as shown in FIG. 1, the reactor shield wall 2 and the concrete containment vessel wall 3 are erected on the floor 4.
At this time, temporary brackets 21 and 21 are provided protrudingly on the outer peripheral surface 9 of the upper end of the reactor shield wall 2 and the inner peripheral surface 10 of the upper end of the concrete containment vessel wall 3, respectively, and on the outer peripheral surface 22 of the upper end of the concrete containment vessel wall 3. A holding foundation 24 is provided.

A steel structure 7 is constructed in the space between the reactor shield wall 2 and the concrete containment vessel wall 3 so that an introduction space 6 is formed above the space, and then the reactor shield wall 2 and the supporting foundation are constructed. Temporary supports 23 and 25, each longer than the thickness and width of the top slab 14 of the concrete containment vessel, are erected on top of 24, and then the temporary upper beam 20 is horizontally installed between each of the temporary supports 23 and 25.

On the other hand, a temporary lower beam 26 is horizontally suspended between temporary brackets 21, 21 which are protruded from the outer peripheral surface 9 of the upper end of the reactor shield wall 2 and the inner peripheral surface 10 of the upper end of the concrete containment vessel wall 3. Then, the top slab liner 13 having an L-shaped cross section is placed on the temporary lower beam 26, and then the lower end 29 of the hanging material 28, such as wire, piano wire, or chain, whose upper end 27 is fixed to the temporary upper beam 20 is placed. It is fixed to the liner 13, and the liner 13 is supported in a suspended state on the temporary upper beam 20.

Next, a large number of reinforcing bars 16 are arranged at short pitches on the tip side of each hanging member 28 using, for example, fastening strings (not shown) such as wires, and then a top slab is installed around the top slab liner 13. 14 pouring forms 15 are assembled, concrete 17 is poured into the pouring forms 15, and the top slab 14 is poured.

After the top slab 14 is placed, the hanging members 28 protruding from the top slab 14 are cut and removed,
Casting formwork 15, temporary supports 23, 25, temporary upper beam 20
Furthermore, the temporary lower beam 26 temporarily installed in the introduction space 6 is selectively removed.

In this way, the top slab liner 13 placed on the temporary lower beam 26 is suspended from the temporary upper beam 20 by the hanging members 28, and the top slab liner 13 is also supported from below by the temporary lower beam 26. Since the top slab 14 is poured by
It is possible to ensure that the pipes 5 and equipment installed in the steel structure 7 can be transported into the introduction space 6 at an early stage of the construction work of the top slab 14 when the hanging of the top slab liner 13 is completed. As a result, the pipes 5 and the like can be installed quickly by passing through the introduction space 6, and the construction period of a nuclear power plant or the like can be shortened.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in the embodiments, a base for a temporary support is provided on the outer peripheral surface of the upper end of the concrete containment vessel. However, this is not always necessary; for example, the concrete containment vessel wall may be made thicker and the temporary supports may be erected on the outer periphery of the upper end surface of the containment vessel wall. In the above, the reinforcing bars are fastened to the hanging members, but the reinforcing bars are not necessarily limited to this, for example, they may simply be housed in the pouring form, and other various design changes may be made within the scope of the gist. Of course.

[0020]

[Effects of the Invention] As described above, the present invention enables the top slab to be cast by suspending the top slab liner placed on the temporary lower beam from the temporary upper beam using a hanging member. It is possible to ensure that equipment, piping, etc. to be installed inside the steel structure can be brought into the installation space early in the construction work, and this allows for early installation of the equipment, etc. by passing through the installation space. This has the effect of shortening the construction period for nuclear reactor construction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a top slab casting process of a concrete containment vessel construction method according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a top slab pouring process in a conventional concrete containment vessel construction method.

[Explanation of symbols]

2 Reactor shield wall 3 Concrete containment vessel wall 9 Upper end outer peripheral surface 10 Upper end inner peripheral surface 13 Top slab liner 14 Top slab 15. Formwork for pouring 16 Rebar 17 Concrete 20 Temporary upper beam 23, 25 Temporary support 24 Retention basics 26 Temporary lower beam 27 Upper end 28 Hanging material 29 Lower end

Claims (1)

[Claims] Claim 1: Temporary supports are erected on the reactor shield wall and the concrete containment vessel wall, which are arranged concentrically at a predetermined distance from each other, and a temporary upper beam is horizontally suspended between the temporary supports; A temporary lower beam is horizontally suspended between the outer peripheral surface of the upper end of the reactor shield wall and the inner peripheral surface of the upper end of the containment vessel wall, and a top slab liner is placed on the temporary lower beam. The lower end of the hanging material fixed to the temporary upper beam is fixed to the top slab liner, the liner is supported in a suspended state on the temporary upper beam, and then the top slab of the concrete containment vessel is placed around the top slab liner. A construction method for a concrete containment vessel, which comprises assembling a formwork, arranging reinforcing bars in the formwork, pouring concrete into the pouring form, and placing the top slab.