JPS6343280B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating dock used to manufacture a large caisson on the sea and tow it to a predetermined installation location. This invention relates to a floating dock that can be used not only as a work boat but also as a work boat with spuds or as a self-elevating work platform.

[Conventional technology]

Floating docks with sidewalls have disadvantages such as the weight of the dock itself and the increased wind pressure area, which requires a large amount of water to offset the buoyancy when sinking, and requires a large amount of power to tow. In order to improve the above-mentioned sidewalls, on both sides of the deck body with adjustable ballast,
For example, a floating dock in which a support is established and a floating body is built on the support so that it can move up and down is disclosed in Japanese Patent Application Laid-Open No. 1983-
Described in Publication No. 11920 and Publication No. 56-108384,
It is already publicly known.

[Problem that the invention seeks to solve]

However, in these known structures, supports are fixedly installed on the upper surface of both sides of the deck body, and the floating body is moved up and down along the supports. Located inward, published in 1983
Even in the case of the floating dock described in Publication No. 108384, only a portion of the outer periphery protrudes outward from the deck body.

For this reason, the area of the deck must be larger than the work area actually required for manufacturing the caisson, and the floating body is simply a vertically movable version of the conventionally fixed sidewall. Correspondingly, the dock itself had a large weight and a large wind pressure area, and even if the above-mentioned drawbacks were improved, they were still extremely insufficient.

An object of the present invention is to provide a floating dock which solves these problems and which can be used not only as a floating dock but also as a work boat with spuds or a self-elevating work platform.

[Means for solving problems]

The configuration of the present invention adopted to achieve the above object will be described based on examples as follows.

The main deck part 1 has a configuration in which the ballast can be adjusted.
A plurality of connecting beams 3 are protruded and fixed on the outer surface thereof, and a support column 4 is erected and erected on the outer end surface of each connecting beam 3 so that it can be connected and fixed or released as necessary.

The deck sub-part 2 which has a floating structure on the above-mentioned pillar 4 is
It is fitted so that it can move up and down. This deck subsection 2 is
When in the lowest moving position and parallel to the outside of the deck main part 1, a flush deck body A having the required area necessary for the caisson manufacturing work is formed together with the deck main part 1. Configure.

At that time, the secondary deck part 2 is, with respect to the main deck part 1,
The configuration is such that it is possible to arbitrarily select and set a fixed relationship or leave the fixed relationship released.

Further, an elevating device 5 such as an inchworm-type elevating hydraulic jack is mounted on the support column 4 so as to be movable up and down, and the deck sub-portion 2 is suspended from it.

In the above, the sub-deck part 2 is a rectangular frame that surrounds the entire periphery of the rectangular main deck part, or a U-shaped frame that surrounds three sides, or two opposing sides, that is, left and right sides, as shown in the examples below. They may be rectangular parallelepipeds located separately along the ship's side. however,
When using a rectangular frame, it is necessary to have a structure in which one side can be opened, closed, or removed, and the caisson can be pulled out.

[Effect]

To manufacture and tow caisson B, the sub-deck section 2 is placed parallel to the outside of the main deck section 1, and the caisson B is mounted on the main deck section 1 while the deck body A, which consists of both of them, is floating on the sea surface. Since the area of deck body A is set to be large enough for the production work of the caisson concerned, workability is good, and the sidewalls and floating bodies can be used as the deck body, unlike conventional ones. Unlike those installed protruding above, the wind blowing area is small, the center of gravity is low, and the stability is good.

Therefore, anchor force and towing resistance during mooring are also small.

To sink and pull out the manufactured caisson B, water was poured into the ballast tank of the main deck part 1, and
This is done by raising the sub-deck part 2 along the struts 4 using the elevating device 5. Since the distance from the center of the main deck part 1 to the center of the sub-deck part 2 is long, the restorability of the main part 1 of the deck on which the caisson B is mounted is extremely good.

In addition to the above-mentioned original method of using the floating dock, there is also a state in which the sub-deck part 2 is fixed to the main deck part 1 with bolts or the like in a lowered position where it is parallel to the main part 1 of the deck. That is, by bringing the deck sub-section 2 into a fixed relationship with the deck main section 1, releasing the connection and fixed relationship between the connecting beam 3 and the column 4, and operating the lifting device 5, the column 4 is fixed to the deck sub-section 1. 2
Therefore, when the main deck part 1 is made to be able to move up and down, the deck body A is floated to the sea surface, and the lifting device 5 extends the support column 4 downward from the deck body A, so that the lower end reaches the seabed. It can also be used as a work boat with spuds to compensate for the lack of anchor force when moored, or as a self-elevating work vessel in which the deck body A is further raised by the elevating device 5 and positioned above the sea surface, and the entire body is supported by each support 4. It can also be used as a stand.

〔Example〕

The illustrated embodiment will be described in detail below.

1 is the main part of the deck with adjustable ballast,
2, 2 is a rectangular parallelepiped deck subpart that has a floating structure.
These deck sub-parts 2, 2 can be arranged in parallel on the outside of the port and starboard sides of the deck main part 1, and in that case, when the deck main part 1 and the deck sub-parts 2, 2 are in a parallel state, both A flat deck body A having the required area necessary for the manufacturing work of the caisson is constructed.

Reference numeral 3 denotes hollow connecting beams which are horizontally protruded and fixed to the outer surfaces of the port and starboard sides of the deck main portion 1, and in this embodiment, four are installed at the front and rear of the outer surfaces of the port and starboard sides.

Reference numeral 4 denotes a hollow support column installed on the outer end surface of each of the connecting beams 3 so as to be connected and fixed or to be able to be released from the connection if necessary.

The sub-deck parts 2, 2 are mounted on the two front and rear columns 4, 4 so as to be able to move up and down, respectively, and take a downward movement position on the lower surface where they are parallel and flush with the main deck part 1. A necessary recess into which the connecting beam 3 is fitted is provided so that the connecting beam 3 can be fitted into the connecting beam 3.

Reference numeral 5 denotes a lifting device, such as a known inchworm type lifting hydraulic jack used for work scaffolding, etc., which is mounted on each of the above-mentioned supports 4, and suspends the deck sub-sections 2, 2.

That is, the deck sub-parts 2, 2 are moved up and down along the support column 4 by the lifting device 5.

However, when the sub-deck parts 2, 2 are in the downward movement position where they are flush and parallel to the main deck part 1, they may be configured to be fixed to the main deck part 1, for example, by bolts or the like. Therefore, in a state where the sub-deck parts 2, 2 are in a fixed relationship with the main deck part 1, by releasing the fixed connection between the connecting beam 3 and the support column 4 and operating the lifting device 5, Pillar 4
can be freely moved up and down with respect to the deck main part 1 as well as the deck sub-parts 2, 2.

Inside the main deck section 1 and connecting beam 3, piping, valves, pumps, etc. for injecting water into the ballast tank are installed.
This will serve as a passageway leading to the area, a space for electrical wiring, etc. Furthermore, a jib crane or the like is installed on each support column 4 (not shown).

To manufacture and tow caisson B, as shown in Figure 3, the sub-deck parts 2, 2 are parallel to the main deck part 1,
This is carried out by mounting the caisson B on the main deck part 1 with the deck body A floating on the sea surface. Deck body A
As mentioned above, the area is set to the size necessary for the manufacturing work of the caisson, and the workability is good, the wind blowing area is small, the center of gravity is low, and the stability is good. Therefore, anchor force and towing resistance during mooring are also small, which is advantageous.

The first stage of settling the manufactured caisson B is to inject water into the ballast tank of the main deck part 1, and to raise the sub-deck parts 2, 2 a little along the struts 4 using the lifting device 5, to lower the main deck part 1. The top surface is aligned with the sea surface (Figure 4).

Generally, the stability of a floating dock is at its worst at this time, so a necessary restoring force is required. However, since the distance from the center of the deck main part 1 to the center of the deck sub-parts 2, 2 is long, the restorability of the deck main part 1 on which the caisson B is mounted is extremely good.

This good resilience is achieved by injecting water into all the ballast tanks in the main deck section 1 and by injecting water into all the ballast tanks in the main deck section 1,
further rise along the pillar 4, and the main deck part 1
The same effect can be achieved in the situations shown in FIGS. 5 and 6, where the water is completely submerged in water.

In the state shown in Fig. 6, the main deck part 1 is sunk the deepest, and the caisson B is able to float even with allowances for increased weight due to manufacturing errors and rocking due to waves. A slight gap is created between the caisson B and the upper surface of the floating dock, allowing the caisson B to be safely pulled out from inside the floating dock.

The above explanation is the original method of using a floating dock. In this case, each support column 4 is fixedly supported on the outer end surface of each connecting beam 3, and the deck sub-parts 2, 2 are movable up and down with respect to the support column 4. The sub-deck parts 2, 2 are placed in a lower position where they are flush with the main deck part 1, and bolts, etc., are inserted into the main deck part 1 as described above. In a state in which the secondary deck parts 2, 2 are in a fixed relationship with the main deck part 1, the connecting beam 3 and the support column 4 are
By releasing the above-mentioned connection and fixing relationship and operating the lifting device 5, the column 4 can be moved up and down with respect to the deck sub-sections 2, 2 and therefore the deck main section 1, as shown in FIG. Or as shown in Figure 8,
It can also be used as a work boat with spuds or a self-elevating work platform.

That is, FIG. 7 shows a structure in which the deck body A is floated to the sea surface, and the lifting device 5 is used to extend the support column 4 downward from the deck body A, so that the lower end reaches the seabed, thereby compensating for the lack of anchor force during mooring. This shows the case where it is used as a work boat with spuds.

FIG. 8 shows how the deck body A is lifted from the seventh
This figure shows a case in which the workbench is further elevated from the state shown in the figure and positioned above the sea level, and is used as a self-elevating workbench supported by each support 4 as a whole.

〔Effect of the invention〕

As is clear from the detailed description above, the present invention has a deck main part configured to allow adjustment of the ballast, and a plurality of connecting beams protruding and fixed on the outer surface thereof, and the outer end surface of each connecting beam has the following features: The pillars are erected and fixed so that they can be connected and fixed or released as necessary, and a sub-deck part with a floating structure is fitted to the pillars so as to be able to move up and down, and this sub-deck part is at the lowest movable position. and when placed in parallel on the outside of the main deck section, together with the main deck section they form a flush deck body having the required area for caisson fabrication work, and the sub deck section is , it has a configuration that allows you to select and set it to be in a fixed relationship with the main part of the deck or to leave it in a fixed relationship, and furthermore, the above-mentioned support is equipped with a lifting device such as an inchworm type lifting hydraulic jack. The deck is mounted so as to be movable up and down, and the deck sub-portion is suspended from it, so the following effects can be achieved.

The construction and towing of a caisson can be carried out with the deck body, with the sub-deck section parallel to the outside of the main deck section, floating on the sea surface, in which case:
The area of the deck body is set to be large enough for the production work of the caisson, so it is easy to work with and is different from conventional models where side walls and floating bodies protrude above the deck body. death,
Small wind area, low center of gravity, and good stability. Therefore, the anchor force and towing resistance during mooring are small, making it economical.

When the caisson is settled and pulled out, water is poured into the ballast tank in the main part of the deck, and
This is done by raising the sub-deck part along the pillars using a lifting device, but the sub-deck part, which has a floating structure, is located above the outside of the main deck part,
Since the distance from the center of the main deck section to the center of the sub-deck section is long, the restorability of the main deck section carrying the caisson is extremely good.

In addition to the original usage of the floating dock mentioned above,
A state in which the sub-deck part is in a lowered position parallel to the main deck part and fixed to the main part of the deck, for example by bolts, that is, the sub-deck part is in a fixed relationship with the main part of the deck. When the column is moved up and down with respect to the sub-deck part and therefore the main part of the deck by releasing the fixed connection between the connecting beam and the column and operating the lifting device, It can be used as a work boat with spuds that compensates for the lack of anchoring force when moored by raising the constituent deck body to the sea surface and using its lifting device to extend the support below the deck body so that the lower end reaches the seabed. It can also be used as a self-elevating work platform by raising the body further using the elevating device and positioning it above the sea level, supporting the entire body with each support.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view, Fig. 2 is a side view, Figs. 3 to 6 show the original usage of the floating dock, and Fig. 3 shows the caisson being manufactured. Figures 4 to 6 are side views of the caisson in its lowered and withdrawn state;
7 and 8 are side views of a work boat with spuds and a state in which it is used as a self-elevating work platform. 1... Main part of the deck, 2... Sub-deck part, 3... Connecting beam, 4... Support, A... Deck body, 5... Lifting device such as inchworm type lifting hydraulic jack.

Claims (1)

[Claims] 1 Main part of the deck with adjustable ballast,
A plurality of connecting beams protrude and fixed on the outer surface of the connecting beam, a column is erected so that it can be connected and fixed to the outer end surface of each connecting beam or can be released as necessary, and it is fitted to this column so that it can move up and down. When it is in its lowest moving position and parallel to the outside of the main deck part, together with the main part of the deck, it forms a flush deck body having the required area necessary for the caisson manufacturing work. At the same time, a sub-deck part that can be fixed to the main part of the deck and has a floating structure, and an inchworm-type lift that is mounted on each of the above-mentioned supports and suspends the sub-deck part. A floating dock characterized by comprising a lifting device such as a hydraulic jack.