JP2002234484A - Load test method for work barge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To very easily and safely apply a test load corresponding to a load in actual work to execute a load test. SOLUTION: A derrick 3 is mounted on a deck 1b of a hull 1 through a substructure 2 supporting an upper deck 7. A testing tank 21 is connected to an end part of a suspension wire 5 suspending an excavator through a suspension hole 1a formed in the hull 1 from the derrick 3. A solid heavy object or a liquid heavy object such as muddy water or seawater is put into the testing tank 21 as the test load, and the load test is executed. After completion of the test, the internal liquid is discharged from a discharge port 25 to empty and recover the testing tank 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load test method for a work boat such as an excavation ship or an exploration ship provided with an excavation device suspended from a derrick.

[0002]

2. Description of the Related Art Conventionally, a work boat such as an excavator for excavating underground resources such as petroleum or an exploration ship for exploring the deep part of the earth, as shown in FIG. The excavator 4 is suspended from the derrick 3 by a suspension wire 1 through a suspension hole 1 a formed in the center of the hull 1. The hanging wire 5 is wound around a sheave 6 provided on the upper part of the derrick 3, and is wound and fed by a winch 8 fixed to an upper deck 7 on which the derrick 3 is erected. I have.

[0003] Then, while feeding muddy water produced on the hull 1 into drill pipes 10 connected to each other to suspend the drilling rig 4, the drill bit 9 of the drilling rig 4 drills the seabed to excavate underground resources. And deep earth exploration. Further, the drilling device 4 is provided with a blowout prevention device 11 called a blowout pre-bender (BOP), which prevents the blowout of underground reserves such as gas and oil from the drilling site when drilling with the drill bit 9. It has become.

In the above-mentioned work boat, a heavy drill pipe 10 having a weight of up to 10,000 m may be suspended during drilling work. , It is necessary to carry out a load test.

Conventionally, as a load test, as shown in FIGS. 5 and 6, an eye plate 13 having an engaging hole 12 is provided on an upper deck 7 on which a derrick 3 is erected and various equipment is installed. For example, welding and fixing to four places, a test wire 14 is fixed to these, and each end is hooked to a suspender 15 provided at an end of the hanging wire 5,
In this state, the wire 5 suspended by the winch 8
Was wound and a test load (approximately 150 tons) was applied to perform a load test on structures such as the derrick 3, the suspending wire 5, and the suspender 15.

[0006]

However, in recent years,
Further, a work boat for deep water excavation that excavates at a deep water is built, and in the case of such a work boat for deep water excavation, the weight of the suspended drill pipe 10 increases.
For this reason, in such a working boat for deep water excavation, since the test load also exceeds 1000 tons, in the test method described above, the number of the eye plates 13 and the test wires 14 must be increased, As described above, when the numbers of the eye plates 13 and the test wires 14 are increased, the balance of the tension of the test wires 14 may be lost, and the load may be in a one-sided state and the test may not be performed safely. there were.

At the time of excavation, together with Derrick 3,
Although a load is also applied to the substructure 2 supporting the derrick 3, the test method described above secures the test wire 14 to the upper deck 7 on which the derrick 3 is erected, and raises the wire. 2, the opposite load was applied. Therefore, the load test of the upper deck 7 and the substructure 2 was not performed, and the reliability was lacking. Moreover, after the test, the eye plate 1 welded to the upper deck 7 at the time of the test is used.
3 had to be removed, and there was a problem that the removal work required a great deal of work.

The present invention has been made in view of the above circumstances, and has a load on a work boat capable of performing a load test extremely easily and safely by applying a test load corresponding to a load during actual work. It is intended to provide a test method.

[0009]

According to a first aspect of the present invention, there is provided a work boat load test method, comprising the steps of: providing a derrick on a deck of a hull via a substructure supporting the upper deck; In a work boat in which an excavator is suspended from the derrick via a suspension hole formed in a hull, a test tank is connected to an end of a suspending wire for suspending the excavator, and then the test It is characterized in that a load test is performed by putting a heavy object consisting of an individual or a liquid in the tank,

That is, a test tank is connected to a suspension wire for suspending an excavator from a derrick and suspended. Thereafter, a heavy object is put into the test tank. Therefore, a plurality of eye plates are welded and fixed to an upper deck. It is extremely easy and safe to connect the hanging wire with multiple test wires, pull the hanging wire, and remove the eye plate again after the test is completed. The load test can be performed at the same time, and the removal operation after the test is completed can be facilitated. Moreover, since the load can be applied in the same way as when the drilling rig is actually suspended, the way the test load is applied to the upper deck or substructure in the opposite way as in the conventional load test may be reversed. , An accurate load test can be performed, and the reliability of the test can be improved.

According to a second aspect of the present invention, there is provided a load test method for a work boat according to the first aspect of the present invention, wherein the test tank has muddy water or a muddy water formed for use at the time of excavating the seabed by the drilling apparatus. It is characterized in that seawater is injected and the test tank is used as a test load.

That is, since the muddy water or the seawater around the hull made for excavation on board is used as the load to be put in the test tank, it is not necessary to prepare a special load. Cost can be reduced. Further, by discharging the seawater or muddy water injected into the test tank and collecting an empty test tank, the test can be completed very easily.

According to a third aspect of the present invention, there is provided a load test method for a work boat according to the first or second aspect, wherein an upper portion and a lower portion of the test tank are provided with a liquid to be loaded. It is characterized in that an inlet and an outlet are provided respectively.

As described above, since the injection port and the discharge port are provided at the upper and lower portions of the test tank, it is possible to extremely easily inject and discharge the liquid as the load into the test tank. It is possible to further facilitate the load test.

According to a fourth aspect of the present invention, in the load test method for a work boat according to any one of the first to third aspects, the test tank is attached to the excavator. It is characterized in that it has substantially the same outer shape as the eruption prevention device for preventing eruption of underground reserves during excavation.

That is, since the test tank is formed to have substantially the same outer shape as the spout prevention device for preventing spouting of the underground reserves during excavation, the load test is performed by regarding the test tank as the spout prevention device. And a more realistic load test can be performed.

According to a fifth aspect of the present invention, there is provided a load test method for a work boat according to any one of the first to fourth aspects, wherein the blowout prevention device is lifted to the upper deck and conveyed. A transport crane is provided, and a load test of the transport crane is performed by lifting and transporting the test tank containing a heavy object by the transport crane.

As described above, the load test of the transport crane can be easily performed by transporting the test tank containing the heavy objects by the transport crane that lifts and transports the ejection prevention device.

According to a sixth aspect of the present invention, there is provided a load test method for a work boat according to any one of the first to fifth aspects, wherein the jet-out preventing device is mounted on a deck of the hull. And a load test for the transport trolley is performed by placing the test tank containing the heavy object on the transport trolley and transporting the test tank.

In other words, the load test of the transport trolley can be easily carried out by transporting the test tank containing the heavy objects by the transport trolley for transporting the mounted ejection prevention device.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a load test method for a work boat according to the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to the same structural parts as those of the above-described conventional technology, and description thereof will be omitted. As shown in FIG. 1, a test tank 21 is mounted on the work boat of this embodiment.
The test tank 21 is formed in a box shape having a rectangular cross section, and has an inlet 2 having a valve 22 at an upper end thereof.
A discharge port 25 having a valve 24 is provided on a side surface near the lower end.

The test riser pipe 2 is connected to the test tank 21 via a connector 26 at the upper end thereof.
7 are connected. A spider 27a, which is a connecting tool, is provided at the upper end of the test riser pipe 27. The spider 27a has a riser handling, which is a connecting tool, connected to the hanging tool 15 via a link 28. The tool 29 is connected.

By connecting the test riser pipe 27 and the test tank 21 and the test riser pipe 27 and the riser handling tool 29 to each other, the suspension suspended from the upper end of the derrick 3 by the suspension wire 5. The test tank 21 is suspended from the fixture 15. In addition, the hanger 15
Rail 30 provided along the vertical direction of derrick 3
Are slidably supported.

Next, a load test method using the test tank 21 will be described. First, as described above, the test tank 21 is connected to the suspender 15 of the suspending wire 5 via the test riser pipe 27 and suspended.
In this state, the valve 22 of the injection port 23 of the test tank 21 is opened, and seawater or muddy water formed on the hull 1 for excavation is injected through the hose 31. The outlet 25
Valve 24 is closed in advance.

Thus, the test tank 21 is
The load is increased by seawater or muddy water injected inside. Then, when the entire test tank 21 reaches the test load, the injection of seawater or muddy water is stopped, the valve 22 is closed, and the test tank 21 having the test load is reached.
In a state in which is suspended, a load test is performed on a structure such as the derrick 3, the suspension wire 5 and the suspension tool 15. When the test is completed, the valve 24 of the discharge port 25 of the test tank 21 is opened to discharge the seawater or muddy water injected therein, and the test tank 21 is removed from the hanging device 15.

As described above, according to the load test method for a work boat, the test tank 21 is connected to the suspension wire 5 for suspending the excavator 4 from the derrick 3 and suspended. Since a plurality of eye plates 13 are welded and fixed to the upper deck 7, the hanging wires 5 are connected by a plurality of test wires 14, and the hanging wires 5 are pulled. The load test can be performed very easily and safely without problems such as a one-sided effect of the load, and the removal work after the end of the test can be facilitated as compared with the conventional load test in which the test is removed again. .

Further, since a load can be applied in the same manner as when the excavator 4 is actually suspended, the manner in which the test load is applied to the upper deck 7 and the substructure 2 is reversed as in the conventional load test. Thus, an accurate load test can be performed, and the reliability of the test can be improved.

Furthermore, since the muddy water or the seawater around the hull 1 used for drilling on the ship is used as the load to be put into the test tank 21, it is not necessary to prepare a special load. In addition, the test cost can be reduced. Further, by discharging the seawater or muddy water injected into the test tank 21 and collecting the empty test tank 21, the test can be completed very easily.

Further, since the injection port 23 and the discharge port 25 are provided at the upper and lower portions of the test tank 21, it is very easy to inject and discharge the liquid as a load into the test tank 21. The load test can be further facilitated. Further, the test tank 21
However, since it is formed to have substantially the same outer shape as the ejection prevention device 11 for preventing ejection of the underground reserves during excavation, the load test can be performed by regarding the test tank 21 as the ejection prevention device 11. An actual load test can be performed.

The contents to be put into the test tank 21 are selected according to the test load. In addition to seawater and muddy water, a steel material or a concrete lump may be added as a fixed ballast to adjust the test load to an appropriate value. In particular, when a large test load is required, a fixed ballast is charged, and muddy water having a specific gravity (about 2.2) larger than the specific gravity of seawater (about 1.0) is injected.

Next, another load test using the test tank 21 will be described. As shown in FIGS. 2 and 3, the upper deck 7 has a BO that is movable along one side thereof.
A P transport crane 32 is provided, and the BOP transport crane 32 can lift and transport the ejection prevention device 11. Also, deck 1b
Is provided with a BOP carrier 33 movable between the outside of the sub-structure 2 and the center.
The ejection prevention device 11 can be placed on the P transport carriage 33 and transported to the center position of the substructure 2.

A load test of the BOP transport crane 32 and the BOP transport cart 33 can be performed using the test tank 21. To perform this test,
First, seawater or muddy water is injected into the test tank 21 so that the load is substantially equal to that of the spout prevention device 11. In this state, the test tank 21 is lifted by the BOP transport crane 32 and the BOP is moved along one side of the upper deck 7.
It is transported to the upper part of the P transport carriage 33.

Next, the test tank 21 is lowered and B
It is placed on the OP transport carriage 33. Further, the BOP transport carriage 33 is driven to transport the test tank 21 to the center position of the substructure 2. Thereafter, the BOP carrier 33 is driven in the opposite manner to
1 is transported out of the substructure 2, lifted by the BOP transport crane 32, transported to a predetermined position, lowered, and installed at a predetermined location. Then, the seawater or muddy water injected into the test tank 21 is discharged.

By transporting the test tank 21 by the BOP transport crane 32 and the BOP transport cart 33 as described above, the BOP transport crane 32 transports the ejection prevention device 11 between the storage location and the hanging location.
In addition, the load test of the BOP transport carriage 33 can be easily performed. That is, it is possible to test in advance whether the BOP transport crane 32 and the BOP transport cart 33 that transport the extremely expensive ejection prevention device 11 are driven reliably,
It is possible to confirm whether or not the ejection prevention device 11 can safely and reliably convey.

[0035]

As described above, according to the load test method for a work boat of the present invention, the following effects can be obtained. According to the load test method for a work boat according to claim 1, a test tank is connected to a suspension wire for suspending an excavator from a derrick and suspended.
Since heavy objects are put in the test tank, multiple eye plates are welded and fixed to the upper deck, the hanging wires are connected by multiple test wires, the hanging wires are pulled, and after the test is completed, the eye plates are removed again Compared with the conventional load test, the load test can be performed very easily and safely without problems such as one-sided effect of the load,
In addition, the removal operation after the test is completed can be facilitated. In addition, since the load can be applied in the same way as when the drilling rig is actually suspended, the way the test load is applied to the upper deck or substructure may be reversed, as in the conventional load test. Therefore, an accurate load test can be performed, and the reliability of the test can be improved.

According to the load test method for a work boat according to the second aspect, since the muddy water or seawater surrounding the hull used for excavation on the ship is used as the load to be put into the test tank, Thus, it is possible to eliminate the need to prepare a suitable load, and to reduce the test cost. Further, by discharging the seawater or muddy water injected into the test tank and collecting an empty test tank, the test can be completed very easily.

According to the load test method for a work boat according to the third aspect, since the injection port and the discharge port are provided at the upper and lower portions of the test tank, the load on the test tank can be extremely easily reduced. Injection and discharge of the liquid to be performed can be performed, and the load test can be further facilitated.

According to the load test method for a work boat according to the fourth aspect, the test tank is formed to have substantially the same outer shape as the ejection prevention device for preventing the ejection of underground reserves during excavation. The load test can be performed by regarding the tank as a blowout prevention device, and a more realistic load test can be performed.

According to the load test method for a work boat according to the fifth aspect of the present invention, the load test of the transport crane is carried out by transporting the test tank containing the heavy object by the transport crane which lifts and transports the ejection prevention device. Can also be easily performed.

According to the load test method for a work boat according to the sixth aspect, the test tank containing a heavy object is transported by the transport vehicle that transports the mounted jet-out prevention device. A load test can also be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a work boat illustrating an embodiment of a load test method for the work boat according to the present invention.

FIG. 2 is a side view of a test tank lifted by a BOP transport crane for explaining an embodiment of a load test method for a work boat according to the present invention.

FIG. 3 is a side view of a test tank mounted on a BOP transport trolley for explaining an embodiment of a load test method for a work boat according to the present invention.

FIG. 4 is a schematic side view of the work boat during excavation of the seabed, illustrating the configuration and structure of the work boat.

FIG. 5 is a schematic cross-sectional view of a work boat explaining a conventional example of a load test method for the work boat.

FIG. 6 is a perspective view of an upper deck for explaining a conventional example of a load test method for a work boat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 1a Suspension hole 1b Deck 2 Substructure 3 Derrick 4 Drilling rig 5 Suspension wire 7 Upper deck 11 Spout prevention device 21 Test tank 23 Inlet 25 Outlet 32 Transport crane 33 Carriage truck

Claims (6)

[Claims] 1. A work boat in which a derrick is installed on a deck of a hull via a substructure supporting an upper deck, and an excavator is suspended from the derrick via a suspension hole formed in the hull. A test tank is connected to an end of a suspension wire for suspending the excavator, and then, in the test tank,
A load test method for a work boat, wherein a load test is performed by placing a heavy object made of an individual or a liquid. 2. The test tank according to claim 1, wherein muddy water or seawater produced for use in excavating the seabed by the excavator is injected into the test tank, and the test tank is used as a test load. Load test method for work boats. 3. The test tank according to claim 1, wherein an inlet and an outlet for a liquid to be loaded are provided at an upper portion and a lower portion of the test tank, respectively. Load test method for work boats. 4. The test tank according to claim 1, wherein the test tank is attached to the excavator and has substantially the same outer shape as an eruption prevention device for preventing eruption of underground reserves during excavation. The load test method for a work boat according to any one of claims 1 to 3. 5. A transport crane that lifts and transports the spout prevention device is provided on the upper deck, and the transport tank is lifted and transported by the transport crane to transport the test tank containing a heavy object. The load test method for a work boat according to any one of claims 1 to 4, wherein a load test is performed on the crane. 6. A carrier for transporting the mounted jet-prevention device is provided on a deck of the hull, and the test tank containing a heavy object is placed on the carrier and transported. The load test method for a work boat according to any one of claims 1 to 5, wherein a load test is performed on the carrier trolley.