KR20130049598A - Apparatus for partial floating in dry dock and method thereof - Google Patents

Abstract

PURPOSE: An apparatus and a method for partially launching a ship in a dry dock are provided to remove a deballasting work in additional ballasting works and resetting works. CONSTITUTION: An apparatus for partially launching a ship in a dry dock(10) comprises a bogie(16), multiple lifting actuators(20), pressure control valves(28), pressure sensors(20a), and a control unit(32). The bogie is moved by moving wheels(18) in the dry dock. The lifting actuators are installed on the top of the bogie and vertically move to load points positioned in the lower part of a partially launched hull(14). The pressure control valves are installed in a hydraulic pipe(26) to control hydraulic pressure. The pressure sensors sense the pressure of the load points of the partially launched hull. The control unit controls the pressure control valves based on the pressure of the load points detected by the pressure sensors.

Description

Apparatus for partial floating in dry dock and method

The present invention relates to a partial launching apparatus for a partial launching hull which is formed when the complete launching hull and the partially launching hull are dried together in a dry dock. By implementing the partial launching of the partial launch hull as a hydraulic support system, the process required for the preparation of the partial launching is reduced, and the ballasting and deballasting operations are abolished, respectively. An apparatus and method for partial launching in a dry dock that can greatly shorten the time required for the present invention.

In general, ships are built in onshore workshops, dry docks, or floating docks. Among them, the drying operation performed in the dry dock has the advantage of making the launching of the completed hull easier. In addition, the construction of the ship in the dry dock is made by accommodating not only full ships (wires) but also partial ships (partial ships) in order to utilize the internal space of the dock more efficiently.

In this case, if the construction work for the complete launch hull is preceded by the partial launch hull inside the dry dock, the partial launch hull under construction should also be launched to move the completed complete launch hull to the design wall. .

As described above, the work on the partial launching that launches the full launching hull together with the launching of the full launching hull in a single dry dock is carried out through the following process. It is called `` Launching '' and the hexadecimal hull is called partial floating and is distinguished from full hexadecimal.

1) Preparation work of partial launch

Preparations for partial launching include dismantling of various utility utilities installed for the construction of partial launching hulls in dry docks, access holes, water barriers, pre-painting to prevent corrosion of the inner plates and ballasting tanks under the repair, This includes the blinding of pipes, cleaning the dock, fixing lumber, checking the flood, installing temporary bulkheads, and performing reinforcement measures as necessary.

2) Create Hex Bill

The launch bill is a drawing that calculates the weight and center of the launch ship and the buoyancy to find the amount of ballast needed for trim and heel adjustment after launch, and helps to make accurate ballasting work on site. It should be written at launch time.

3) Ballasting work

The ballasting operation is carried out using the pipelines at the dock side's cavity as a duct, rather than the ballast line of the ship, by placing the specified amount of seawater or fresh water in the designated tank with reference to the launch calculation at the hydraulic panel of the payload.

4) Watering work in dry dock

Watering is the operation of pumping seawater into the dock by operating a pump installed around the dock gate.

5) Bottom check

This is a work to check the watertightness and leakage of each ship by the number of people who were injected into the dock at the time when the bottom of each launching line was touched.In this case, if water leakage or abnormal condition occurs, stop the water immediately and You must continue.

6) Draft reading

After all launching ships have been floated, the draft is measured on the quay or dock side. If, as a result of the draft measurement of the partial launch hull, there is a problem with the reset operation due to trim or heel, ballasting and deballasting shall be added to adjust it.

7) Open gate of dry dock

If the sea level in the dock is nearly identical to the sea level outside the dock, the dock gate is opened and the towing ship is ready for movement of the full launch hull.

8) Launch ship

Corresponds to the movement of the complete launching hull to the specified quay. At this time, the partial launch hull performs preparation for moving back to the reset position in the dry dock.

9) Resetting

After closing the dock gate, this is the job of positioning the partial launch hull while draining the seawater in the dock back to the outside using a pump.

10) Partial Hull Deballasting

It is the work of removing the seawater or fresh water ballasted in the partial launch hull after resetting.

11) Dock Cleaning

Corresponds to cleaning the inside of the dry dock again. At this time, the cleaning work on the partial launch hull should also be carried out.

Therefore, the launching work for the partial launch hull in the conventional dry dock should be carried out various engineering work such as weight calculation and launching calculation to calculate flotation draft and ballasting amount. Adjustments to ballasting and deballasting are required to maintain the trim.

In addition, lumber must be placed and installed to withstand the weight of the partial launch hull and the number of ballasts in the dry dock, and equipment such as pumps for ballasting and deballasting must be prepared separately. Pre-corrosion painting in hull shells and ballasting tanks and washing of hulls after deballasting should be carried out.

As a result, in constructing and launching a full launch hull and a partial launch hull together in a conventional dry dock, a series of operations for partial launch of a partial launch hull are not only complicated, but also post-finishing with preliminary work. This results in the required time, the elapse of time required for the addition of various operations, and thus a delay in the drying period.

Accordingly, the present invention has been made in view of the above-mentioned matters, and when drying the complete launching hull and the partial launching hull simultaneously in a single dry dock, the process of partial launching on the partial launching hull is required for drying. The aim is to reduce the period of time required to improve the turnover of the dock.

The present invention for achieving the above object is a device for the partial launch of the partial launch hull in a dry dock, the cart is installed to be movable through the moving wheel in the dry dock;

A plurality of lifting actuators installed to be movable upward and downward through pressure control toward respective load points positioned at the lower portion of the partial launching hull at the upper portion of the bogie;

A pressure control valve for controlling the hydraulic pressure provided and installed in the hydraulic pipe leading to the lifting actuator;

A pressure sensor installed at a contact portion with the partial launching hull to detect pressure at each load point of the partial launching hull; And

And a control unit configured to perform pressure control on the pressure control valve via the pressure on each load point detected by the pressure sensor.

In the present invention, the pressure sensor is characterized in that it is installed in the contact portion with the partial launch hull at the leading end of the lifting actuator.

In the present invention, the support actuator is installed in the lower portion of the bogie to move up and down toward the bottom of the dry dock, and is installed in the hydraulic line leading to the support actuator for fixing or releasing the position of the partial launch hull, It further comprises an opening and closing control valve for controlling the supply and shut off of the hydraulic pressure, the control unit is characterized in that for controlling the pressure supplied to the supporting actuator via the switching of the opening and closing control valve.

The present invention provides a method of adjusting the lifting height for the partial launch hulls for the full launch hull and the partial launch hull in a dry dock, comprising: installing the partial launch hull in the dry dock to enable movement and adjustment of the lifting height;

Pouring water into the dry dock and checking a watertight state of the partial launch hull and whether water is leaked;

Performing pressure control in the dry dock to support the partial launch hull to a target draft lower than an expected flotation draft;

Opening the gate of the dry dock and moving the complete launching hull to a chairman's quay wall;

Closing the gate of the dry dock and discharging seawater to the outside of the dock for resetting of the floated hull hull;

Resetting the partial launching hull by adjusting a lifting height after discharging seawater of the dry dock; And

Moving the reset partial launching hull in the dry dock to a working position for wire drying.

In the present invention, the step of performing the pressure control for raising the partial launch hull to a target draft lower than the expected flotation draft is to detect the pressure change value for adjusting the lifting height for each load point of the partial launch hull Calculating an average pressure change value of the detected pressure change value;

Individually determining whether the pressure change value detected at each load point is less than an error range for each load point;

If all of the pressure change values detected at each load point in the step are less than the error range, the draft of the partial launch hull in the dry dock is compared with the target draft (lower than the expected flotation draft) in the dry dock. step; And

If all the pressure change values detected at each load point in the step are less than the error range, it is determined whether the draft of the partial launch hull reaches the target draft, and if the draft of the partial launch hull reaches the target draft, each load Ending the pressure control for the adjustment of the lifting height to the point is characterized in that it consists of.

In the present invention, among the pressure change values detected individually at each load point in the step, the load points out of the error range are compared with the average pressure change value, and accordingly individual pressure control for adjusting the lifting height is performed. It is characterized by the implementation.

In the present invention, if the pressure change value detected at each load point in the step is more than the average pressure change value, the duty is increased in the pressure control for adjusting the lifting height, and the pressure detected at each load point in the step If the change value is smaller than the average pressure change value, the duty is reduced in the pressure control for adjusting the lifting height.

In the present invention, after the duty control for adjusting the lifting height for each load point in the step, the pressure change value for each load point of the partial launch hull is detected, and the average pressure of the detected pressure change value The following steps of calculating the change value are sequentially performed.

In the present invention, in mixing and drying a full launch hull and a partial launch hull together in a dry dock, a partial launch method for simultaneous launching of a partial launch hull for complete launch of a complete launch hull is completed. In addition to the abolition of some processes such as pre-painting required for launching of hulls, various engineering tasks for calculation of flotation draft and ballasting amount for partial launching can be minimized. In addition to in-tank ballasting operations for flotation, additional ballasting operations to maintain even trims of the partial launch hull after launching and deballasting operations upon resetting can be abolished, respectively.

In addition, the present invention can facilitate the movement of the partial launch hull to the position of the correct coordinates (initial working position) in the dry dock in the resetting operation, and in particular the complete after-drying of the partial launch hull in the dry dock Since it is possible to more easily perform the seat shift to the working position in preparation for launching, it is possible to further increase the productivity of shipbuilding by improving the rotation rate of the dock with a shortening of the time required for drying.

1 is a plan view of a dry dock to which the present invention is applied, a view for explaining a state in which a complete launch hull and a partial launch hull are dried together.
Figure 2 schematically shows the configuration of a device for partial launching in a dry dock according to the present invention.
Figure 3 is a flow chart for explaining a method of adjusting the lifting height for the partial launch in the dry dock according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings.

As shown in FIG. 1, a plurality of complete launching hulls 12 and partial launching hulls 14 are provided in a single dry dock 10. The dry dock 10 is configured to control the inflow of seawater into the interior by opening and closing the gate 10a.

The partial launch hull 14 in the dry dock 10 is installed to be able to move and adjust the lifting height via a hydraulic support facility, the hydraulic support facility is shown in Figure 2, the trolley 16 ) And wheel (18), lifting actuator (20), supporting actuator (22), hydraulic pump (24), hydraulic pipe (26), pressure control valve (28), on / off control valve (30), and control unit ( 32).

The trolley 16 is installed to be movable through a plurality of moving wheels 18 in the dry dock 10. The moving wheel 18 is preferably composed of an omni-directional driving wheel having a drive and steering means or the like to freely move the working position in the dry dock 10.

The lifting actuator 20 is a hydraulic cylinder installed to be movable upward and downward toward the bottom of the partial launch hull 14, and serves to firmly support each load point located below the partial launch hull 14. To perform. At this time, the lifting actuator 20 can be freely adjusted for each height by the pressure control, the quantity is determined so as to withstand the load applied from the partial launch hull 14 sufficiently. In particular, the lifting actuator 20 supports a plurality of load points located below the partial launch hull 14, and is distributed and installed in a plurality of positions in the longitudinal direction as well as the width direction of the hull. In addition, the pressure sensor 20a is installed to detect the pressure at each load point of the partial launch hull 14, the pressure sensor 20a is between the partial launch hull 14 and the lifting actuator 20 It is implemented as a piezo element installed in the contact portion of.

The supporting actuator 22 is a hydraulic cylinder which is installed to be movable up and down with respect to the bottom of the dry dock 10 with respect to the bogie 16 and, when inflated, the bogie 16 of the bogie 16 in the dry dock 10. In addition to performing a function of maintaining a fixed position, a function of allowing the free movement of the trolley 16 through the moving wheel 18 by releasing the fixed state of the trolley 16 during contraction. To perform. At this time, the supporting actuator 22 is also provided in a proper amount for the lower portion of the bogie 16 in consideration of the load of the partial launch hull 14.

The hydraulic pump 24 is installed to provide separate hydraulic pressure to the lifting actuator 20 and the supporting actuator 22, wherein the hydraulic pump 24 and the lifting actuator 20 and the supporting actuator 22 are provided between the hydraulic pump 24 and the hydraulic actuator 24. Independent hydraulic conduits 26 are provided, and each hydraulic conduit 26 is provided with a pressure control valve 28 for pressure control and an opening and closing control valve 30 for opening and closing control of the flow path.

That is, the pressure control valve 28 is installed in the hydraulic pipeline 26 from the hydraulic pump 24 to the lifting actuator 20 to duty control the hydraulic pressure required for the operation of the lifting actuator 20, The opening / closing control valve 30 is installed in the hydraulic line 26 from the hydraulic pump 24 to the supporting actuator 22 to control the on / off of the hydraulic pressure required for the operation of the supporting actuator 22. To this end, the control unit 32 performs duty control on the lifting actuator 20 separately with on / off control on the supporting actuator 22 and the hydraulic pump 24, respectively.

Meanwhile, the hydraulic line 26 disposed between the lifting actuators 20 and the supporting actuators 22 from the hydraulic pump 24 shows only a path for supplying hydraulic pressure in FIG. 2 for convenience of illustration. The paths for the return and the drain of are corresponding to the conventional configurations and thus will not be shown.

Hereinafter, a partial launch method in a dry dock according to the present invention will be described in detail.

The process for partially launching the partial launch hull 14 in order to move the complete launching hull 12, which has been pre-dried in the dry dock 10, to the chairman's quay wall is as follows.

The lower portion of the partial launch hull 14 is installed in the dry dock 10 using a hydraulic support facility in a state capable of adjusting a moving and lifting height. This process is preceded by the drying process of the partial launch hull 14.

Subsequently, the seawater is poured into the dry dock 10, and the watertight state of the partial launch hull 14 and the leak state are checked. In this process, the partial launch hull 14 supported in the dry dock 10 is lifted to a target draft lower than the expected draft by pressure control of the hydraulic support facility.

Subsequently, the gate 10a of the dry dock 10 is opened to prepare for the movement of the complete launching hull 12, and the complete launching hull 12 is moved to the design wall using a towing ship.

Subsequently, after closing the gate 10a of the dry dock 10, seawater is discharged to the outside of the dock for resetting of the floated partial launch hull 14.

Subsequently, after the seawater is discharged from the dry dock 10, the partial launch hull 14 is lowered through pressure control of the hydraulic support facility.

Subsequently, the partial launching hull 14 which is lowered by the hydraulic support in the dry dock 10 is moved to the working position for resetting by driving control of the moving wheel 18 of the bogie 16. End the series of work processes for, and start the drying work again.

A series of pressure control processes for adjusting the lifting height in order to raise the partial launch hull 14 to a lower draft than the expected flotation draft is shown in FIG. 3.

First, the control unit 32 turns on the driving of the hydraulic pump 24 and opens the pressure control valve 28 of the hydraulic support device to lift the lifting height for each load point of the partial launch hull 14. Prepare pressure control for adjustment. (S10, S20)

Subsequently, the control unit 32 receives the pressure change value detected at each load point of the partial launch hull 14 via the pressure sensor 20a, and then averages the pressure change value detected at each load point. The pressure change value is calculated (S30).

Subsequently, the control unit 32 separately determines whether the pressure change value detected at each load point is included in the error range by classifying each load point. (S40)

In this process, the control unit 32 determines whether the draft of the partial launch hull 14 reaches the target draft if all of the pressure change values individually detected at each load point are less than the error range. )

In this process, when the draft of the partial launch hull 14 reaches the target draft, the control unit 32 turns off the pressure control valve 28 and the hydraulic pump 24, respectively, to lift the lifting height for each load point. End pressure control for adjustment (S60, S70)

In addition, if any one of the pressure change values detected individually at each load point is greater than the error range, the control unit 32 may be lifted through the execution of individual pressure control for the load points with the detected pressure change value greater than or equal to the error range. Adjust the height That is, if the pressure change value in the above process is greater than the error range, the pressure change value detected at each load point and the average pressure change value is compared (S42), and accordingly for the pressure control valve 28 of the hydraulic support equipment Duty control is performed separately.

For example, if the pressure change value detected in the above process is equal to or greater than the average pressure change value, the duty is increased in the pressure control for adjusting the lifting height (S44). On the contrary, if the pressure change value is smaller than the average pressure change value, the lifting The pressure is reduced in the pressure control for adjustment of the height. (S46)

In addition, the control unit 32 detects a pressure change value for each load point of the partial launch hull 14 after the duty control for the pressure control valve 28, and averages the detected pressure change values. The following process (S30) which calculates a pressure change value is performed sequentially.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the particular details of the embodiments set forth herein. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

10-dry dock 10a-gate
12-Full Hull 14-Part Hull
16-bogie 18-shift wheel
20-lifting actuator 20a-pressure sensor
22-supporting actuator 24-hydraulic pump
26-Hydraulic Pipeline 28-Pressure Control Valve
30-opening control valve 32-control unit

Claims (8)

Apparatus for the partial launching of the partial launch hull 14 in the dry dock 10,
A trolley 16 installed to be movable through the moving wheel 18 in the dry dock 10;
A plurality of lifting actuators 20 which are installed in the upper portion of the trolley 16 so as to be movable upward and downward through pressure control toward respective load points positioned at the lower portion of the partial launch hull 14;
A pressure control valve 28 for controlling the oil pressure provided and installed in the hydraulic pipe line 26 leading to the lifting actuator 20;
A pressure sensor 20a installed at a contact portion with the partial launching hull 14 to detect pressure at each load point of the partial launching hull 14; And
Partial launch in the dry dock, characterized in that it comprises a control unit 32 for performing the pressure control on the pressure control valve 28 via the pressure for each load point detected from the pressure sensor 20a Device for. The method according to claim 1,
The pressure sensor (20a) is a device for partial launch in the dry dock, characterized in that installed in the contact portion with the partial launch hull (14) at the tip of the lifting actuator (20). The method according to claim 1,
A supporting actuator 22 which is installed to be movable upward and downward from the lower portion of the trolley 16 toward the bottom of the dry dock 10 to fix or release the position of the partial launching vessel 14; and the supporting actuator It is further provided with an opening and closing control valve (30) installed in the hydraulic passage 26 leading to the (22) to control the supply and shutoff of the hydraulic pressure, the control unit 32 mediates the switching of the opening and closing control valve (30) Apparatus for partial launch in a dry dock, characterized in that for controlling the pressure supplied to the supporting actuator (22). As a method for launching the full launch hull 12 and the partial launch hull 14 in the dry dock 10,
Installing the partial launch hull 14 in the dry dock 10 so as to allow movement and adjustment of a lifting height;
Pouring water into the dry dock (10), and checking the watertight state of the partial launch hull (14) and whether the water leaks;
Performing pressure control to raise the partial launch hull 14 in the dry dock 10 to a target draft lower than an expected flotation draft;
Opening the gate (10a) of the dry dock (10) and moving the complete launching vessel (12) to a design hull;
Closing the gate (10a) of the dry dock (10), and then draining seawater out of the dock for resetting of the floated partial launching vessel (14);
Resetting the partial launch hull 14 by adjusting the lifting height after discharging the seawater of the dry dock 10; And
Partial launch method in a dry dock, characterized in that it comprises the step of moving the partial launch hull (14) lowered in the dry dock (10) to the working position for resetting. The method of claim 4,
The step of performing the pressure control for raising the partial launch hull 14 to a target draft lower than the expected flotation draft
Detecting a pressure change value for adjusting a lifting height for each load point of the partial launch hull 14 and calculating an average pressure change value of the detected pressure change value;
Individually determining whether the pressure change value detected at each load point is less than an error range for each load point;
Comparing the draft of the partial launch hull 14 in the dry dock 10 with a target draft if all of the pressure change values individually detected at each load point in the step are less than the error range; And
If all of the pressure change values detected at each load point in the step are less than the error range, it is determined whether the draft of the partial launch hull 14 reaches the target draft, and the draft of the partial launch hull 14 is the target draft. Reaching a pressure control for adjusting the lifting height for each load point. The method according to claim 5,
Among the pressure change values detected at each load point in the above step, the load points outside the error range are compared with the average pressure change value, and accordingly, individual pressure control for adjusting the lifting height is performed. How to Heal My Partial Dry Dock. The method of claim 6,
If the pressure change value detected at each load point in the step is equal to or greater than the average pressure change value, the duty is increased in the pressure control for adjusting the lifting height, and the pressure change value detected at each load point in the step is the average pressure. If less than the change value, the partial launch method in a dry dock, characterized in that to reduce the duty in the pressure control for adjustment of the lifting height. The method of claim 7,
After the duty control for adjusting the lifting height for each load point in the step, the pressure change value for each load point of the partial launch hull 14 is detected, and the average pressure change value of the detected pressure change value Partial launching method in a dry dock, characterized in that for sequentially performing the following steps to calculate the.

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