JPS62121237A - Equipment foundation construction method - Google Patents

Abstract

PURPOSE:To shorten the term of construction, by casting floor concrete, after a foundation-setting trestle is set on the floor bottom section, reinforcements are arranged on the floor, and an apparatus foundation block is set on the trestle. CONSTITUTION:After a foundation-setting trestle 2 is set on a floor bottom section 1, reinforcements 3a, 3b are arranged on the floor. Then, after a prefabricated apparatus-foundation block 4 is set on the trestle 2, floor concrete 5 is cast.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for constructing a foundation for equipment, and in particular, for the construction of a foundation for a rotating machine such as a motor or generator, or a floor pit (concavity) such as in a control room. This article relates to a method for constructing a concrete foundation, such as a board platform, in which cables are laid and routed.

[Background of the invention]

In recent years, the central control room of a nuclear power plant has been reduced in size,
In order to optimize the overall layout of the plant, the conventional method of installing it inside the control building is being replaced by a method of installing it inside the reactor building. Furthermore, when installed in a reactor building, the central control room will be installed on the upper floor from the viewpoint of appropriate layout.

In the past, construction work for the central control room could be done separately from the reactor building, but construction work usually starts from the lower floor, so the central control room is installed inside the reactor building. In this case, construction work related to the central control room cannot begin until the construction work of the reactor building has progressed to a certain extent. Meanwhile, the equipment that has been installed will begin testing, but at this point the central control room must be completed. In other words, central control room construction has become a critical path in the overall construction process.

For similar reasons, cable construction from the central control room to field equipment is also becoming a critical path. The wiring inside the central control room is separated from the cable work between field equipment and the collective terminal board, making it possible to carry out advance work on the latter.

On the other hand, for wiring between the collective terminal board and the central control room control board, as shown in FIG. is launched from the bottom of the panel, streamlining cable installation.

Regarding the basic construction of the control room, for example,
As described in Japanese Patent Application Laid-open No. 52-21592, there is a method of combining concrete columns and engineering steel.

In this method, the concrete pillars that serve as the foundation for the board were set one by one after the floor concrete was poured, and the frames were constructed one by one. There are approximately 10 concrete pillars in the central control room.
As the number of pieces reached 0, the foundation work for the central control room, including adjusting the position and height of the panel foundation and laying the cable tray, was
It has become a critical path in the process, and reducing the number of man-hours and construction period has become an important issue.

In addition, concrete foundations are used as foundations for rotating equipment such as motors and generators due to their earthquake resistance and strength, but the conventional method of creating foundations after pouring concrete for the floor does not require foundation blocks. - It takes time to form the concrete floor, and it takes about two months to complete the foundation after handing over the concrete floor, including curing and finishing, which causes delays in the construction of the piping connected to the equipment.

[Purpose of the invention]

An object of the present invention is to provide an equipment foundation construction method that allows equipment concrete foundation work to be completed in a short period of time.

[Summary of the invention]

A feature of the present invention is that equipment foundation blocks are created in parallel with on-site construction, and before the floor concrete is poured, the foundation blocks are placed on a setting frame to set the position, and then the floor concrete is poured. At the point. By preparing the foundation blocks in advance in this way, only one concrete pouring is required on site, significantly shortening the foundation construction period.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on examples.6 FIG. 1 is a flowchart showing an embodiment of the equipment foundation construction method according to the present invention.

In step A, when the lower part of the floor 1 is constructed, a foundation setting frame or frame 2 is brought in and installed. This frame is used to set the height and position of the equipment foundation.

In step B, floor reinforcements 3a and 3b are installed.

In step C, the equipment foundation block 4 prepared in advance is carried in and installed on a setting pedestal.

Finally, in step D, the floor concrete is poured,
Complete foundation work.

It is clear that even if steps B and C are reversed, the advantages of the present invention will not change.

FIG. 2 shows an example of the equipment basic block 4. As shown in FIG.

FIG. 2(a) is an external view of the block, and FIG. 2(b) is a sectional view of the block. Basic block 4 is.

The reinforcing bars 22 protrude from the bottom and are connected to the floor concrete 5. Here, a linear shape is shown as an example, but it goes without saying that an angular shape may also be used. Further, bolts 21 for fixing the equipment are embedded, and a portion of the bolts protrudes from the top of the block. A device (not shown) and the block 4 are connected by bolts 21-.

FIG. 3 shows another example of the equipment basic block 4.

In FIG. 3, there is an embedded metal fitting 31 in the upper part of the block, which is connected to the equipment by welding.

The example in FIG. 1 is shown for one foundation block 4, but if there are multiple foundations, the multiple foundation blocks 4 may be brought in and set up as one. Fourth
In Figure 9, which is an example of the appearance of integrated foundation blocks, foundation blocks 4a, 4b, 4c, 4d,
4e, 4f are embedded metal parts 31a, 31b, 31c, 31
d.

3Le and 31f are connected to the beam 41 by welding.

When carrying in the foundation blocks, they are carried in by being suspended by a crane 42 while being integrated, and set at the 7th position of the setting frame 2. In this case, after placing the floor concrete, the beam 41
Removed and completed the foundation work.

In this way, the dimensions between the foundation blocks can be maintained with high precision. In the example shown in FIG. 4, six blocks are integrated, but any number of blocks can be brought in and set in the same way.

In addition, regarding the foundation block that uses the bolts shown in Figure 2 instead of the foundation block with the embedded metal fittings shown in Figure 3,
It goes without saying that when the parts are integrated with a beam as shown in the figure and transported and set up, the box L1-21 can also be used for attachment to the beam.

The above is an example of carrying in and setting the foundation block after setting the setting frame, but as shown in FIG. 5, the foundation block 4a,
4b is integrated with the setting frame 2, and the crane 42
There is also a way to import and configure it. In this case, there is an advantage that the product only needs to be transported once.

〔Effect of the invention〕

According to the method of the present invention, the following effects can be obtained.

1. Work such as reinforcement construction, formwork construction, molding, and surface finishing of the equipment foundation foundation at the equipment foundation construction site is no longer necessary, and it becomes possible to create alternative foundation blocks in parallel with the on-site construction work. This greatly reduces the number of on-site production steps.

Construction period can be shortened. In particular, setting and adjusting the block position and its height is a part that conventionally requires a lot of man-hours, but according to the foundation block integrated setting method of the present invention, such adjustment work at the construction site can be greatly reduced. It can be reduced.

2. Since the foundation blocks, tray blocks, and foundation setting frames or their integrated manufacturing can be carried out in a factory, processing and welding are facilitated, making it possible to reduce manufacturing costs and improve quality. In particular, by standardizing the basic blocks, which have a large number of them, on-site production becomes possible, resulting in significant cost reductions.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing the construction procedure of the equipment foundation construction method according to the present invention, Fig. 2 is a diagram showing a precast foundation block in which equipment is fixed to the foundation foundation with bolts, and Fig. 3 is a diagram showing a precast foundation block in which equipment is fixed to the foundation foundation with bolts. Figure 4 is a diagram showing a foundation block that is fixed in place. Figure 4 is a diagram showing how multiple precast foundation blocks are integrated with a beam, suspended by a crane, and placed on a setting frame. Figure 5 is a diagram showing a foundation block and a setting frame. FIG. 6 is a diagram showing the state of the wiring around the collective terminal board. 1... Lower floor, 2... Frame for foundation setting, 3... Floor reinforcement, 4... Precast foundation block, 5... Floor concrete, 9... Cable tray, 11... Collective terminal board, 12... Prefabricated cable, 21... Equipment fixing bolt, 22... Foundation block reinforcement, 31.
...embedded hardware, 41...beam, 42...crane.

Claims (1)

[Scope of Claims] 1. A method for constructing an equipment foundation having a floor pit for inter-equipment wiring, etc., including the steps of A. arranging a foundation setting frame on the lower part of the floor, and B. arranging floor reinforcement. A method for constructing an equipment foundation, comprising the steps of: (C) setting a pre-prepared equipment foundation block on the pedestal; and (D) pouring floor concrete. 2. Claim 1 is characterized in that when there are a plurality of equipment foundation blocks, some of the equipment foundation blocks and the setting frame are integrated in advance, and the above steps A and C are performed simultaneously. equipment foundation construction method. 3. A method for constructing an equipment foundation according to claim 1, characterized in that, when there are a plurality of equipment foundation blocks, several of the blocks are integrated in advance by a beam, and are carried in and set at the same time.