JP4624290B2 - How to install the prime mover on the hull - Google Patents

Description

  The present invention relates to a method of installing a prime mover on a ship, for example, an aluminum alloy hull, in particular, a structurally weak hull such as a large aluminum alloy hull. On the other hand, it is a new method for installing the prime mover, and it is possible to install the prime mover in a short time without drilling bolt holes for installation bolts etc. in the hull stand (installation base). It is to provide.

  In large vessels, not limited to aluminum alloy vessels, a high-power, high-speed gas turbine engine is installed in the center of the hull as the prime mover in the engine room. In some cases, a method of driving a propulsion device such as a screw or an impeller of an axial flow pump with a long propulsion shaft may be employed.

  Specifically, large aluminum using aluminum alloy for the main part of the hull structure, with a captain of 140m, a ship width of 30m, an output of 28000 kW, and a high-output, high-speed gas turbine engine arranged on the left and right In the case of an alloy high-speed ship, an impeller shaft having a hollow diameter of 440 mm and a length of 8.5 m is connected to a thrust shaft having a length of 7.8 m by an assembly type hydraulic joint.

  In general, a hull is constructed accurately and efficiently on a stern in a dock, and various devices such as an engine are sequentially mounted in the hull in parallel with the process. The stern propulsion unit and the engine are connected by connecting the impeller shaft and the thrust shaft, which have been placed in the ship in advance, in a state where the hull is launched and floated on the sea.

  In ordinary ship construction work, the engine and the propulsion shaft are rarely attached only by adjusting the length by a single "shaft core line-out operation", and machining for adjusting the length of the propulsion shaft is required. Propulsion shafts are machined to a predetermined length, and are usually used by connecting the shafts with flanges, and the length of the shaft is adjusted using the thickness of this flange portion. ing.

  In particular, the installation surface of the lower part of a heavy engine, which is heavy, has a plurality of installation legs, and each installation leg has a plurality of bolt holes. In addition, a plurality of metal plates for height adjustment for fixing the installation legs on the hull platform are prepared, and it is necessary to drill bolt holes in advance.

  Therefore, if an error occurs from the initial position where the engine is fixed, it is necessary to correct this, but the subsequent correction work (that is, the reverse work) is unexpectedly complicated, and many Need a period of time. In particular, this modification work is a major obstacle to shortening the engine installation process.

  An example of a series of installation steps for a general large gas turbine engine is as follows. This method is described in Non-Patent Document 1, for example.

  1) Axial line-of-sight work: Measure the positional relationship between the center of the boss of the stern propulsion shaft and the center of the output shaft of the engine, and determine the installation position of the engine.

  2) Marking work on the engine mounting base plate: Using the dimensions measured in the above-mentioned shaft core line-of-sight work, the marking work of the bolt hole drilling position of the engine installation part is performed.

  3) Drilling holes for installation bolt holes on the engine mounting base plate: Drilling holes of predetermined dimensions at the positions of the bolt holes marked in the step 2 above.

4) Engine mounting operation: A gas turbine engine is mounted on the engine mounting platform.
5) Centering work: The centering work of the engine mounted on the engine platform determines the front / back / left / right / top / bottom installation positions between the propeller and the engine, and the clearance between each mounting leg and the tensioning liner is determined. measure.

  6) Liner measurement work: Drilling holes in the installation baseboard are performed before the engine is installed and before the launch.

7) Liner machining: The thickness of the liner is adjusted by machining.
8) Liner insertion work: The liner whose thickness has been adjusted in the previous process is inserted between the installation base (hull base) and the installation leg of the engine.

  9) Tightening of installation bolts: In the bolt holes drilled in multiple metal plates from the upper surface of the engine installation legs to the installation base, from the top to the bottom of the installation base Pass the fixing bolt and tighten the nut on the lower side of the bolt to fix the engine on the installation base.

The method for mounting an engine or the like inside the hull is described in the following non-patent documents.
"Ship System and Propeller", Ishihara Tsuji, Naruyamado Shoten

  An example of a high-power, high-rotation gas turbine engine E as a main engine installed on the large-sized aluminum alloy hull is as shown in FIGS. The engine E is a large structure having a width B of 280 cm, and there are 10 mounting legs F on one side and 20 on both sides.

  Further, although not shown in the drawing, an anti-vibration rubber is provided below the mounting leg F via a fixing plate, and this fixing plate is a large one having a width of 200 mm and a length of 500 mm. . A reduction gear G is connected to the output shaft of the engine E, and a propulsion shaft is connected to the output shaft of the reduction gear G. In addition, the mounting leg F, which is the foundation of the engine E, has a considerably complicated structure in which various metal plates are combined as described below.

  When the engine E of the size is used as a main engine, there are usually at least six bolt holes on the mounting base corresponding to the bolt holes formed in one mounting leg F. In order to install the gas turbine engine of the stand, the number of bolt holes on the mounting base plate is 120 to 180.

  Moreover, the hulls of large aluminum alloy ships are much less rigid than ordinary steel hulls. Displacement occurs, and the mounting portion is also displaced.

  As mentioned above, the engine is often fixed on the mounting base of the aluminum alloy hull before launch, but the hull is floated on the sea in such a state that the engine is installed on the mounting base. A subtle displacement occurs in the hull. In this state, a deviation occurs between the accurate mounting position of the propulsion shaft measured by the “shaft core view work” and the actual position of the propulsion shaft after launch. Therefore, in the case of a gas turbine engine with high output and high speed, it is necessary to accurately and carefully adjust its installation position.

  When the engine is installed on the hull base as described above, the number of installation bolt holes in the hull base reaches 120 to 180, and the position of the engine once installed can be changed in the subsequent work. To make adjustments, remove the engine from the hull stand, adjust the size of the bolt holes that have been drilled first, increase the size of the bolt holes, fill the original holes, and drill holes in another location. A retroactive work was necessary.

The adjustment of the bolt holes on the hull base must be performed individually in response to a large number of bolt holes by operating a small tool in the narrow engine room. Therefore, such an operation is quite complicated. It is an inefficient work and needs to be improved. In addition, it is a method that must be avoided particularly in the case of an aluminum alloy hull that is difficult to weld.
(Example of conventional engine installation leg structure)

  FIG. 4 shows an example of the structure of a conventional engine installation leg, and the bottom member of the aluminum alloy hull is an aluminum alloy ship bottom 15, from which an aluminum alloy support plate 16 is attached. It is planted by welding, and further, an aluminum hull stand 17 is welded and fixed on the support plate 16 to constitute an engine mounting base.

  An aluminum alloy tension liner 18 (for example, 20 mm) is welded on the hull stand 17, and an aluminum alloy adjustment liner 19 (for example, 40 mm) is disposed on the tension liner 18. An installation leg portion (made of iron, thickness is 20 mm) 20 of the gas turbine engine which is the main machine is placed on the top.

  A drilling hole is drilled through the mounting bolt hole 21 with a drilling machine so as to be exactly linear from the mounting leg 20 of the engine to the hull base 17 below. In addition, although this bolt hole 21 is opened to each member and may be united later, in this case, although it is slight, the center of a bolt hole may shift | deviate.

  One bolt hole 21 needs to be formed by penetrating a plurality of metal layers accurately from the mounting leg portion 20 of the main engine, the adjustment liner 19, the tension liner 18, and further to the hull platform 17. According to the conventional engine installation method, one installation bolt hole 21 is continuously formed in a plurality of thick metal plates from the mounting leg 20 of the gas turbine engine, which is the main engine, to the hull base 17. Thus, drilling with a drilling machine was necessary.

  By the way, as shown in FIG. 3, in the case of a gas turbine with an output of 28000 kW, a set of 6 to 8 or more installation bolt holes (for example, a diameter of about 20 mm) in the mounting leg portion is set. Moreover, since there are at least 20 mounting legs, the total number of bolt holes does not drop by 120.

  As described above, in the case of a large aluminum alloy hull having a captain exceeding 140 m, displacement occurs in each part of the hull when the ship is launched. In particular, it causes subtle deformation in the mounting position of the heavy engine. Specifically, an error occurs in the distance between the stern propulsion unit and the engine on the hull platform 17 formed in the engine room, and therefore, it is necessary to adjust the fixed position of the engine.

  To adjust the bolt holes related to the mounting legs of this engine, the original bolt holes are filled with welding, and bolt holes are drilled at different positions, or the surroundings of the original holes are cut and widened. Work is necessary. This correction work requires about two weeks in the case of an aluminum alloy hull of the above-mentioned size, which increases the construction cost and the number of days.

  The present invention determines the position of the engine accurately just by mounting the engine once on the hull platform, and then fixes the prime mover to various hulls, particularly large aluminum alloy hulls that can be quickly fixed. It provides a way to

  In order to achieve the above object, a method for fixing a prime mover to a hull according to the present invention, particularly an aluminum alloy hull, is fixed as follows.

  1) The aluminum plate of the tension liner composed of aluminum plate / iron plate is welded and fixed on the hull stand on the aluminum hull stand formed on the hull, and the lower surface of the installation leg of the prime mover The iron adjustment liner is fixed with bolts and the motor is arranged at a predetermined position, and then the iron plate side of the tensioning liner and the adjustment liner are fixed by welding.

2) In the method of attaching the prime mover to the hull stand made of amyl formed on the hull, the aluminum plate side of the tension liner composed of the clad material made of aluminum plate / iron plate is arranged on the hull stand, A step of welding to a predetermined position, a step of fixing an iron adjustment liner to a mounting leg portion of the prime mover with a bolt, a position where the prime mover is disposed above the tension liner, a position to be fixed is measured, and the position is determined. a step of determining is characterized by comprising the step of welding the said adjusting liner and pinning the liner in said determined position.

3) combined with said adjustment liner which is bolted to the mounting leg of the prime mover, and said steel plate side of the clad material made of welded aluminum sheet / iron plate hull base at the bottom of the hull, the prime mover shaft core after adjusting the position of the measured motor by threading process is characterized by fixed by welding a steel plate and the adjusting liner of the clad material.

  The present invention relates to a ship made of an aluminum alloy by fixing a bolt between an engine mounting leg and an adjustment liner made of an iron plate for height adjustment in an engine room inside the hull, particularly an aluminum alloy hull. A clad material made of an aluminum alloy and an iron plate is arranged on the upper surface of the shell base (installation leg), and the iron plate is arranged on the upper surface by welding the plate side of the aluminum alloy. Then, the hull is launched and floated on the sea, and the displacement that occurs when the hull stabilizes is generated in a straightforward manner.

Then, the engine is positioned in a state where the propulsion unit and the engine are connected by the propulsion shaft.
After that, after the position of the adjustment liner made of iron plate fixed with bolts under the mounting leg portion is determined, the adjustment liner and the iron plate side of the tension liner are welded and fixed.

  That is, in the engine fixing method of the present invention, the member to be bolted is only between the mounting leg and the adjustment liner. Moreover, since welding is employed as a fixing method after positioning after launching, the operation is extremely simple and can be completed in a short time, and the engine can be installed efficiently. In addition, since there is no engine mounting error, it is possible to eliminate "reversing work" such as adjusting the position of the mounting bolt holes.

Next, embodiments of the present invention will be described with reference to the drawings.
Hereinafter, for the sake of explanation, an aluminum alloy hull will be described as a hull. However, it is apparent that the present invention can be applied even when only the hull base on which the hull engine made of a steel plate is installed is made of an aluminum alloy.

  FIG. 1 is a cross-sectional view showing a fixing structure according to the present invention, which is drawn in comparison with the fixing structure of a mounting leg portion of the conventional engine shown in FIG.

  A hull base 17 made of an aluminum alloy plate is fixed to a predetermined position on a bottom 15 of the aluminum alloy hull through a support plate 16 made of an aluminum alloy plate. A tension liner 25 using clad steel made of an aluminum alloy plate 25a and an iron plate 25b is placed on the hull platform 17, and the aluminum alloy plate 25a side is fixed by an aluminum weld 26.

  An adjustment liner 27 having a thickness adjusted by the following process is fastened to the lower side of the installation leg portion 20 of the engine with an installation bolt 28. Then, the adjustment liner 27 fixed to the engine side is placed on the tension liner 25.

  Then, after the engine is positioned at a predetermined position through the following work steps, a state in which the engine is fixed by iron welding is shown.

  Next, the features of the present invention will be described by comparing the work process according to the present invention with the conventional work processes described in (). In the present invention, all the work processes described in () are described. Since it can be omitted, the engine installation process can be significantly shortened.

1) Axis line-of-sight work: Accurately measure the shaft line between the shaft hole of the stern propulsion unit and the output shaft of the engine to confirm the installation position of the engine. The tension liner 25 is previously welded onto the hull base 17 made of aluminum alloy.
The tension liner 25 uses clad steel made of an aluminum alloy plate 25a / iron plate 25b, and the aluminum alloy plate 25a side is fixed on the hull stand 17 with an aluminum weld 26.
(The conventional method does not use a tension liner made of clad steel.)
2): Simple confirmation of the installation position of the engine.
(In the conventional method, it was necessary to make a ruled line at the position where a hole was to be drilled for each installation bolt hole in the shaft line-of-sight work.)
3) Engine mounting work: Do not drill mounting bolts.

    The engine is mounted on a tension liner 25 that is aluminum-welded on the hull platform 17. Therefore, it is not necessary to adjust the holes of the installation bolts, so it is possible to speed up the installation work of the engine, and there is time to spare. It is also possible to do this.

4) Centering work: Jack bolts are used for engine centering work.
5) Liner measurement work: The installation position of the front / rear / left / right / upper / lower of the engine is determined by centering work, the gap between each installation leg and the adjustment liner 27 is measured, and the thickness at which the liner 27 is cut is determined.
6) Liner machining: Machine the adjustment liner 27 and drill holes for installation bolts in the same place as the installation legs 20 of the engine. In addition, this drilling operation is decided once.
(In the conventional method, drilling of the hull base 17 is performed before the equipment is installed and before the launch. However, in the case of a large ship, there is a considerable amount of displacement in the hull due to the installation or launch of the equipment on the hull. However, there were many cases where the position of the installation bolt holes that had been drilled in advance did not match the design position of the engine that was determined by aligning the shaft center in the previous process. Etc., backtracking work often occurred.)

7) Liner insertion operation: The adjusting liner 27 machined in the above process is inserted between the installation leg 20 of the engine and the tension liner 25.
8) Installation bolt fastening: The installation bolt 28 is passed through the installation bolt hole 20a formed in the engine installation leg 20 and screwed into the screw hole 27a provided in the adjustment liner 27, so that the installation leg 20 and the adjustment liner 27 are engaged. Is united.
9) Installation work by welding: If the adjustment liner 27 is placed on the upper surface of the tension liner 25 as described above, the upper iron plate 25b side of the clad steel and the engine installation leg 20 which is an iron plate are connected to the iron. Weld 29 to fix the engine in place.

    As described above, the present invention adopts the steps 1) to 9) to accurately determine the position of the engine within the hull after launching the hull. The engine installation operation can be completed only by ordinary welding of the adjustment liner 27 made of an iron plate and the iron plate 25b side of the tensioning liner 25 without complicated processing such as mechanical cutting.

    According to the prior art, the work period required from the launch of the aluminum alloy hull to the installation of the engine required one month. However, according to the present invention, there is no reversible machining and so on. The work can be completed in about half a week in a week, and the installation position of the engine is more accurate than the conventional method, and the engine can be operated smoothly over a long period of time.

It is sectional drawing of the support structure of the engine which concerns on this invention. It is sectional drawing which shows an example of the internal structure of the stern part of the aluminum alloy hull. It is explanatory drawing of the installation leg part of a gas turbine engine, (A) is a front view, (B) is a bottom view. It is sectional drawing of the support structure of the conventional engine shown corresponding to FIG.

Explanation of symbols

15 Ship bottom (aluminum alloy hull) 16 Support plate (aluminum alloy)
17 Hull Base (Installation Base) 18 Installation Liner 19 Adjustment Liner 20 Engine Installation Leg 25 Tension Liner (Aluminum Alloy / Steel Clad Steel)
27 Adjustment liner

Claims (3)

  The aluminum plate side of the tension liner made of clad steel of aluminum plate / iron plate is welded and fixed onto the hull stand on the aluminum hull stand formed on the hull. A method of fixing a prime mover to a hull, wherein an iron adjustment liner is fixed with a bolt, the prime mover is arranged at a predetermined position, and then the iron plate side of the tension liner and the adjustment liner are fixed by welding. In the method of attaching the prime mover to the aluminum hull base formed on the hull, the aluminum plate side of the tension liner made of clad steel of aluminum plate / iron plate is placed on the hull stand and welded in place A step of fixing an iron adjustment liner to a mounting leg portion of the prime mover with an installation bolt, a step of arranging the prime mover above the tension liner, measuring a position to be fixed, and determining the position; the method of installing the motor to the hull, characterized in that it consists of a step of welding the steel plate side of the adjusting liner and pinning the liner in the determined position. And the adjusting liner fixed by foundation bolts in mounting the legs of the prime mover, the sticking liner made from the hull of the bottom of the hull base to welded aluminum sheet / iron clad steel combined with the steel plate side, the prime mover after adjusting the position of the prime mover is determined by the axial forecast process, the iron plate of the clad steel, the adjusting liner and a method of installing the motor to the hull of claim 2, wherein a fixed by welding.

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