JPH03133896A - Installing method for atomic reactor building ceiling crane - Google Patents

Abstract

PURPOSE:To shorten the construction period of the whole atomic power plant by carrying in and temporarily installing a crane girder fitted with a power feed cable tray in advance after concrete is placed on a crane floor beam. CONSTITUTION:A power feed cable tray 11 is fitted to a crane girder 4 in advance on the ground to form a crane girder with tray 13, then it is carried in and temporarily installed. The crane girder with tray 13 is installed in parallel with the construction of roof steel skeletons 8. Cables 12 are installed in parallel with the assembly of an R/B (atomic reactor building) ceiling crane 7, and running, adjustment and test are started after the installation of cables 12 is completed. The construction of a crane floor beam 3 and fourth floor walls 5 and 6 are performed in parallel with the running, adjustment and test in the construction side. The installation of cables 12 can be started when the installation of the crane girder with tray 13 is completed without waiting the disassembling and removal of scaffolds 10 at the construction side.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a ceiling that can shorten the construction period of a nuclear reactor building (hereinafter referred to as R/B) when constructing a nuclear power plant. Concerning crane installation method.

(Prior Art) FIG. 3 is a sectional view showing the general configuration of an R/B, and FIG. 4 is a sectional view showing the positional relationship between the R/B and an R/B overhead crane. In Fig. 3, R/Bl is a four-story building, and the reactor containment vessel 15 is constructed from the first floor, that is, the basement, to the fourth floor floor 2, and the fourth floor wall above the fourth floor floor 2 is constructed. A crane floor beam 3 is installed on the floor.

A crane girder 4 is installed on this crane floor beam. In the figure, 5 indicates the fourth floor wall (2), 6 indicates the fourth floor wall (2), 7 indicates the R/B overhead crane that runs along the crane girder 4, and 8 indicates the roof steel frame.

When constructing the above R/Bl, first concrete is poured from the 1st floor to the 4th floor 2 of the R/Bl.
Next, concrete is poured up to the crane floor beam 3, and then the 4th floor wall above the crane floor beam 3 ■5
, In parallel with the concrete pouring in Part 6, the R/B ceiling crane 7 will be installed. In addition, the roof steel frame 8 will be erected in parallel with the erection of the crane floor beam 3, but prior to this, the crane girder 4 has been brought in and temporarily placed.

Its installation is carried out in parallel with the erection of the roof steel frame 8, so that these works are completed almost at the same time.

Next, on the machine side, as shown in FIG. 4, the crane rail 9 is installed on the crane girder 4, and the R/B ceiling crane 7 is assembled.

Furthermore, on the construction side, the construction of the fourth floor wall 5 is carried out in parallel with the assembly of the R/B overhead crane 7, and this construction is carried out as follows. That is, a scaffold 10 is erected between the upper surface of the crane floor beam 3 and the lower surface of the beam 5A provided at the upper end of the 4th floor wall 5, concrete is poured for the 4th floor wall 5 and the beam 5A, and the curing period is After the lapse of time, the scaffold 10 is dismantled and removed.

Furthermore, on the machine side, following this, a power supply cable tray 11 is constructed inside the crane girder 4, and after laying the cable 12 therein, running and adjustment tests of the R/B ceiling crane 7 are carried out. and undergo a witness inspection by a labor standards-related regulatory agency.

The above process is illustrated in FIG. 2B.

(Problems to be Solved by the Invention) However, the above-mentioned method of installing an R/B overhead crane has the following problems. Namely.

Installation of the power supply cable tray 11 is only possible after the curing period of the beam 4A has elapsed and the scaffolding 10 has been removed, which delays the start of testing of the R/B ceiling crane 7 and prevents the R/B ceiling crane 7 from being tested. There was a drawback that the start of service for the B overhead crane was delayed. In addition, the installation of the power supply cable tray 11 and the laying of the cables 12 must be performed in a narrow space, and the work procedure is extremely complicated and complicated.
The drawback was that the work related to the overhead crane would take a long time.

As mentioned above, the construction period related to the R/B overhead crane has a great influence on the overall construction period of a nuclear power plant, and is a major cause of the prolongation of the construction period of a nuclear power plant.

The present invention has been made based on the above-mentioned circumstances, and is a reactor building overhead crane that can shorten the construction period of the entire nuclear power plant by reducing the construction man-hours and construction period related to the R/B overhead crane. The purpose is to provide installation methods.

[Structure of the Invention] (Means for Solving the Problems) The installation method of the nuclear reactor building overhead crane of the present invention is such that the power supply cable tray is installed at the time when the concrete placement of the crane floor beam of the nuclear power plant building is completed. The present invention is characterized in that a crane girder with a tray attached in advance is carried in and temporarily placed, and cables are laid into the power supply cable tray regardless of the progress of construction work.

(Function) In the installation method of the reactor building ceiling crane of the present invention having the above configuration, curing of concrete on the top floor of the reactor building 1 is carried out.
No need to wait for scaffolding to be dismantled or removed.

It is possible to install a crane girder with a tray and lay cables, and it is possible to shorten the construction period related to R/B cranes.

(Example) The same parts as in FIGS. 3 and 4 are given the same reference numerals. FIG. 1 is a sectional view of an embodiment of the present invention, and FIGS. 2 A and B are the construction period of the installation method of the present invention and the conventional method. It is a process diagram showing a comparison with that of the installation method. In FIG. 1, in the installation method of the present invention, the crane girder is a tray-equipped crane girder 13 to which a power supply cable tray 11 is attached. In this way, by employing the crane girder 13 with a tray, the cable 12 can be laid regardless of the construction of the fourth floor wall. That is, as shown in FIG. 2A, a power supply cable tray is attached to the crane girder on the ground in advance to form the crane girder with tray 13, which is then brought in and temporarily placed. In parallel with the erection of step 8, the crane girder 13 with tray is installed.

Next, in parallel with the assembly of the R/B overhead crane, cable 1
2 and after the cable 12 has been installed.

Start driving, adjusting, and testing. In addition, on the construction side, construction of crane floor beam 3, 4th floor wall 5, and crane 6 will be carried out in parallel with the above-mentioned running and testing.

By employing the crane girder 13 with a tray as described above, cable installation can be started as soon as the installation of the crane girder 13 with a tray is completed, without waiting for the dismantling and removal of the scaffolding 10 on the construction side. In other words, the coordination of work between the machine side and the construction side, which was a problem in the conventional R/B overhead crane installation method, is reduced, and the work of installing the power supply cable tray and laying the cable 12 becomes extremely easy. In FIG. 2A, the part marked (shortened) indicates the shortened period of the construction period.

Therefore, the construction period related to the R/B overhead crane is significantly shortened, and at the same time, the workability and safety of such work are greatly improved.

[Effects of the Invention] As is clear from the above, the R/B overhead crane installation method of the present invention can significantly shorten the construction period for the R/B overhead crane, thereby reducing the construction period for the entire nuclear power plant. It is possible to significantly shorten the time and reduce construction costs.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of one embodiment of the present invention, Figures 2A and B are process diagrams comparing the installation period of the present invention and the conventional installation method, and Figure 3 is a diagram of the R/B installation method. A sectional view showing a general configuration, FIG. 4 shows the position of the R/B and the R/B overhead crane,
FIG. 3 is a cross-sectional view showing the relationship.

Claims (1)

[Claims] When the concrete placement of the crane floor beam of the nuclear power plant building is completed, the crane girder with the tray to which the power supply cable tray has been attached is brought in and placed temporarily, and the power supply cable tray is placed inside the power supply cable tray regardless of the progress of the construction work. An installation method for a nuclear reactor building overhead crane, which is characterized by laying cables to the reactor building.