JPH0232444B2 - PURANTOBAAJI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a plant barge for constructing various plants, such as a chemical plant, a steel plant, a desalination plant, or a power generation plant, on a ship berth combined with concrete blocks.

[Technical background of the invention and its problems] Conventionally, when constructing these plants,
After sending the large number of equipment and parts produced at the factory to the plant construction site, they are assembled, installed, and connected to each other with piping.
Alternatively, complex processes were required, including electrical wiring work, instrumentation work, grounding work, etc., as well as various tests and trial runs. However, with this conventional plant construction method, the work environment varies widely depending on local circumstances, so the construction period and cost fluctuate significantly, and there are many unexpected dangers associated with land transportation and on-site work. It was hot. Therefore, one method is to build the entire plant or a part of it as a buoyant structure like a ship's hull, and use that buoyancy to transport and install the plant to a predetermined value. A plant barge method is being used to construct a The plant barge method will be explained below using a thermal power plant as an example.

Traditionally, the construction of a thermal power plant starts with civil engineering work at the power plant construction site, as described above, and includes construction of the foundation for the turbine generator, construction of the turbine building, construction of the boiler steel frame, raising the boiler drum, The main components were being installed in line with the progress of civil engineering and turbine building construction. At sites with poor local installation conditions, these installation works took a long time and had a large impact on the power plant construction price. In addition, it was important to transport and bring in each element of the power plant's component equipment in accordance with the installation period, which increased transportation costs. In particular, securing skilled engineers was a problem for power plants built in underdeveloped areas. In contrast, recently power plant components such as boilers, turbines, generators, transformers, and their auxiliary equipment, as well as turbine buildings, have been installed on floating platforms.
One huge package is manufactured and assembled in the factory, and this package is transported as a single unit using a submersible purge system using waterways such as sea or rivers to near the power plant construction site, and then towed to a pre-prepared installation location. However, by injecting water into the ballast tank installed on the ship's platform, the area is backfilled and connected to electricity, water, fuel equipment, etc. outside the package, thereby greatly shortening the on-site installation period. A package-type power generation plant system is used, in which power generation equipment is manufactured in-house with sufficient quality control.

The package type power generation equipment will be explained below using the drawings. Figure 1 is a partially cutaway plan view, Figure 2 is a sectional view (side view) taken along the straight line in Figure 1, and Figure 3 is a cross-sectional view (side view) taken along the straight line in Figure 1.
The figure is a cross-sectional view (front view) taken along the straight line - in Figure 1.
It is. In the figure, reference numeral 1 denotes a ship's platform, which has a ballast tank 1' and is manufactured in a dock in a factory like a normal ship. Main equipment such as generator 4, transformers 5, 6, 7, etc., and their auxiliary equipment such as forced draft fan 8, chimney 9, condenser 1
0, power plant including circulating water pump 11, diarerator 12, compressor equipment 13, water supply pump equipment 14, hydrogen gas generator 15, storage battery equipment 16, control room 17, crane and hoist equipment 18, emergency power generation equipment 19, etc. Most of the component equipment is mounted and configured as one huge package P.
Reference numeral 20 in the figure is a turbine generator building for protecting these devices. Each of these devices constituting the power generation package is manufactured in a factory in a short period of time under strict control, and then assembled and mounted on the ship's platform 1.

FIG. 4 is a diagram showing the state of sea transportation of the power generation package P. In the figure, P is the power generation package, and B is a submersible purge for mounting the power generation package P. Further, T is a towing boat for towing this submersible purge B, and S is the sea. In this way, the power generation package is towed close to the power plant construction site by the towing boat T.

In this way, package-type power generation plants allow the power generation plant equipment and the building that houses it to be manufactured and assembled at the manufacturer's desired location, and can also be installed anywhere in the world as long as it can be transported by water. Can be done.

It is also clear that the power generation package described above can be used as a mobile power station that does not have to be fixedly installed on land, but is fixed while floating on water and transmits the generated power to land for a predetermined period of time.

Above, we explained plant barges using power plants as an example, but chemical plants, steel plants, etc.
It goes without saying that the same method can be applied to various plant barges such as desalination plants and water treatment plants. This is because the plant structure can be assembled to a nearly completed state in the factory, and as a result, a large amount of on-site construction work can be omitted, and the plant structure, which is built as a floating body, can be assembled along a waterway. Transport becomes significantly easier by navigating to the ground;
Moreover, it has many advantages such as the installation work can be carried out safely and accurately using extremely simple means using buoyancy.

By the way, when installing electrical equipment on a plant barge, as with electrical equipment installed on land,
Grounding is required to prevent danger to humans and protect electrical equipment from ground faults that occur in equipment and electrical circuits. For this reason, if the platform of the plant barge is made of steel plates, (1) Place a grounding net inside the platform to ground each electrical device, pull out one or more ends of the grounding net outside the platform, and connect it to the outside. A method of completing the grounding system for the entire plant by connecting it to the grounding system (2) Connect each electrical device on the cradle directly to the cradle, connect the cradle to the external grounding system at one or multiple points,
A method of completing the grounding system for the entire plant by using the ship's platform itself as a grounding busbar has been adopted. On the other hand, in the case of a concrete boat platform, as mentioned in (2) above, the boat platform cannot be used as a grounding busbar, so there is a problem in that it is not possible to construct a grounding system as easily as with a steel plate platform. The only method that could be implemented was to construct a grounding system by laying a grounding net on the cradle for grounding, similar to (1) for the steel plate cradle. However, this method not only complicates the grounding network, but also requires space for the grounding network, and is grounded in such a way that the voltage rise on the ground bus in the event of an accident does not exceed a predetermined value. The busbar configuration and equipment layout must be configured.
There were many restrictive conditions, such as the structure not allowing people to easily approach the grounding wire.

[Object of the Invention] In view of the above-mentioned problems, the present invention provides a blunt barge that is safe and accurate, does not require any particular space for grounding, and has a sufficient grounding network using a simple method. With the goal.

[Summary of the Invention] Therefore, in the present invention, when constructing concrete blocks that are combined to form a boat platform, the through-holes for the tightening wire between the blocks are shared, or if necessary, a through-hole for the ground bus bar is provided separately, and the concrete blocks are combined. When converting into a boat platform, a ground bus bar is embedded separately from the wire for tightening the concrete block, so that no particular ground bus bar is required on the boat platform.

[Embodiment of the Invention] The present invention will be described below with reference to an embodiment shown in FIGS. 5, 6, and 7. As shown in FIGS. 5 and 6, the concrete slipway has a plurality of concrete blocks 21 and a vertical tightening wire 2 that tightens between the concrete blocks.
3. The wire 24 for lateral tightening and the end of the platform are generally constructed of reinforcing bars 22 hardened with concrete. In order to pass the vertical and horizontal block tightening wires,
When manufacturing the concrete block 21, a through hole 100 for the wire is provided, and when manufacturing the platform, that is, when joining the concrete blocks, the wires 23, 24 are inserted into the through hole 100.
Through this, the concrete blocks are tightened. If the conductivity is high and the tightening wires 23 and 24 can be used as a ground bus, there is no problem in using them as a ground bus, but it goes without saying that the tightening wires 23 and 24 are It is necessary to tighten the blocks together using a force of 2.5 mm, and ordinary wires made of copper or aluminum alloy, which have high electrical conductivity, are useless. Therefore, at present, these wires 23 and 24 are usually made of hard piano wire or the like with a strong tensile force. Moreover, as shown in FIGS. 5 and 6, these tightening wires 2
3 and 24 are composed of a plurality of wires even for one concrete block in order to tighten the block 21 with an even force.

In the present invention, since it is difficult to use the tightening wires 23 and 24 of the concrete block 21 as a grounding busbar as described above, the grounding wires 23 and 24 of the concrete block 21 are grounded separately from the tightening wire through holes 100 between the blocks when the concrete block 21 is constructed. When forming a through hole 101 exclusively for the bus bar and further combining concrete blocks 21 to form a ship's platform,
A ground bus bar 102 is embedded in this through hole 101 to form a ground bus network for equipment mounted on the ship's platform. Further explanation will be given using FIG. 7 to clarify the relationship with onboard electrical equipment. 25 is onboard equipment, 27
is a grounding wire from the onboard equipment 25, 26 is a branch line from the grounding bus, 28 is a connection line between the grounding buses, 29 is an external grounding wire for connection to the underground mesh, and 30 is a grounding wire for grounding. It is an embedded mesh. When the concrete blocks 21 are combined to form a boat platform as described above, the ground bus bar 102 is embedded into the boat platform through the through hole 101 dedicated to the ground bus bar. Furthermore, the connections of the single ground bus 102 in the vertical and lateral directions are made at the ground bus connection lines 28 to form a ground bus network within the concrete block. The onboard equipment 25 has a ground branch line 26
It is connected to a ground bus network via a ground line 27.
Furthermore, by connecting the ground bus network inside the ship's platform to a ground mesh 30 buried underground by an external ground wire 29 at one or multiple points, an entire electrical ground network can be constructed.

[Effects of the Invention] By embedding the ground bus 102 in the concrete block 21 as described above, there is no main ground bus on the ship's platform except for some ground branch lines 26, so it is easy to install a ground net. Not only does this eliminate the need for special space for wiring, which is advantageous in terms of equipment placement, but the structure also prevents people from getting close to the grounding wire, which helps prevent danger in the event of a ground fault in electrical equipment. Furthermore, since the onboard equipment 25 is directly connected to the ground bus 102 through the grounding branch line 26 and the grounding wire 27 from the equipment 25, it goes without saying that it can be expected to be effective in protecting the electrical equipment itself in the event of a ground fault. .

In addition, make the through hole for the tightening wire larger,
Pass the tightening wire and ground bus through the same hole,
It is also highly recommended from the present invention to create a similar ground bus network, or to create a ground bus network by using part of the tightening wire through hole as a hole for passing the ground bus, and the same effect can be expected.

As explained above, according to the present invention, a simple and safe ground bus system can be constructed for mounting electrical equipment on a concrete ship platform, and an inexpensive and safe plant barge can be provided.

[Brief explanation of drawings]

Figure 1 is a partially cutaway sectional view of the power generation package assembled on the ship's platform, and Figure 2 is a straight line from Figure 1.
Figure 3 is a cross-sectional (front) view taken along the straight line - in Figure 1, Figure 4 is a diagram for explaining an example of transportation of the power generation package, and Figure 5 is the configuration of the ship's platform. 6 is a sectional view taken along the straight line - in FIG. 5, and FIG. 7 is a diagram for explaining the grounding system for a plant barge of the present invention. 1...Ship, 1'...Ballast tank, 2...
Boiler, 3...turbine, 4...generator, P...
...Package type power generation equipment, B...Barge, 21...
...Concrete block, 22...Reinforcement bar, 23,
24...Wire for tightening concrete block, 25...Mounted equipment, 26...Grounding branch line, 2
7...Grounding wire from onboard equipment, 28...Connection line between ground busbars, 29...External grounding wire, 30...Mesh buried underground for grounding, 100...Wire through hole for tightening concrete block, 101...Grounding Through hole for embedding bus bar, 102...Ground bus bar.

Claims (1)

[Claims] 1 Combine concrete blocks to make a boat platform,
In a plant barge on which electrical equipment is mounted as at least part of the plant on the cradle, a ground bus bar is embedded in the concrete block separately from the concrete tightening wire, so that there is no particular need for a ground bus bar on the cradle. plant barge.