JPS5975888A - Fixing method of stern nozzle - Google Patents

Abstract

PURPOSE:To shorten occupation time of dock required for fixing by manufacturing a stern nozzle under the state splitted into four then fixing upper two nozzles when mooring while fixing lower two nozzles in dock. CONSTITUTION:A stern nozzle 11 is manufactured under the state splitted into four and under moooring state upper two nozzles 12, 13 are fixed through wires 22, 23. Then the hull is moved into dock to fix lower two nozzles 14, 15. Consequently occupation time of dock can be shortened while since the stern nozzle is splitted into four, propeller is not required to be removed.

Description

[Detailed description of the invention] The present invention relates to a method for installing a stern nozzle.

In recent years, in order to improve the efficiency of probers on ships,
As shown in Figure 1, there is a propeller (2) at the rear of the hull (1).
A stern nozzle (3) is attached to surround the stern nozzle (3). By the way, when installing such a stern nozzle on an existing ship, first put the ship into dock, and then remove the propeller (2) while in the dock as shown in Figure 2. (3) was installed on the hull (1). However, the above method has disadvantages in that the construction period in the dock is long and the dock cannot be used effectively.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an umbrella trigo qd7 method for a stern nozzle that can eliminate the above-mentioned drawbacks.

That is, in the present invention, the stern nozzle is manufactured in a state in which it is divided into four parts, vertically, horizontally, and horizontally, and then when the hull to which the stern nozzle is attached is in a berthed state, the two divided nozzles in the upper half are fixed to the hull, and then This method is characterized by moving this hull to a dock and installing two split nozzles in the lower half. According to this method, the period of use of the dock can be significantly reduced, and the stern nozzle can be installed. Since it is divided into four parts, there is no need to take the trouble to remove the propeller when installing the stern nozzle to the hull.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 14.

First, as shown in Fig. 3, the stern nozzle (hereinafter simply referred to as the nozzle) aυ, which has a perfect circular shape when viewed from the front, is divided horizontally along the hull center line and at the center in the vertical direction into four parts.
Assemble on the ground. In Fig. 3, the upper right part is the first divided nozzle (2), the upper left part is the second divided nozzle O, the lower left part is the third divided nozzle Q4, and the lower right part is the fourth divided nozzle. Say (to). When assembling on the ground, as shown in Figures 4 and 5, the center bracket Q119tl is attached to the first divided nozzle (2), but this center bracket Q is attached to the bottom of the first divided nozzle (2).
1 (12A), it is attached with a slightly protruding shape. By projecting the center plaque (00) downward in this way, when the first divided nozzle (6) and the first divided nozzle Q3 are to be combined later, they can be easily joined by fillet welding or the like.

For example, as shown in FIG.
4, it is necessary to extend the lower plate (1 wave) of the first divided nozzle toward the second divided nozzle. Therefore, when aligning the first and second divided nozzles Oj, K, the lower plate (12AX138) have to butt weld and contact each other, making welding work difficult and uncertain.
As shown in the figure, the lower plate (1
(13λ) and the upper plate (12'B
12A), welding during joining becomes easier. Note that even if the center bracket OQ is slightly protruded, the propulsion performance is not affected. And the above 1st to 4th
The split nozzle O (13Q4) QFj is assembled in a perfect circle on the ground, but in order to easily restore the perfect circle when installed on the ship's hull Q7), during temporary assembly on the ground, it is assembled as shown in Figure 6. A pair of joint fittings (18AX18B) are the first
Lower plate (12A) (1) of divided nozzle @ and first divided nozzle 0
3A) Attached to the lower surface (as shown in FIGS. 4 and 5), and the lower plate (laA) of the second and third divided nozzles 03a4 (1■ attached to the outer surface (as shown in FIG. 7), respectively, and the pole) (They are integrally connected to each other by 11.

Although not shown, the first and fourth divided nozzles W (
The US has the same structure. Further, each of the divided nozzles 403 is provided with a guide plate 4 for guiding the end face of the other divided nozzle tt(a<aυ) to a predetermined position.

Next, the installation work of the nozzle αυ will be explained.

First, as shown in FIG. 8, the water level of the docked ship Q is made as shallow as possible so that the lowest propeller boss C21) is located above the sea surface. Next, the first divided nozzle @ is lifted up by a crane or the like via the gear (2) and mounted at a predetermined position at the rear of the hull Q'I).

Next, lift the second divided nozzle (13) with a wire member in the same way as the above M1 divided nozzle @, and remove the first divided nozzle (2).
Match. At this time, the second split nozzle α is easily guided to the predetermined position by the guide plate fixed to the side of the center bracket Q (9). are matched with each other by fine adjustment, and connected to each other by 11. As soon as the perfect circle state in the upper half of the nozzle (B) is restored, the first and first divided nozzles Q1
A stopper piece (not shown) is welded to the joint portion of No. 3 to fix them together. Next, the upper half nozzles u4α, which are fixed to each other, are positioned with respect to the hull (17). This positioning method uses a propeller (c), so the positioning method for
A right angle ruler (E) that measures a predetermined distance from the rear end of the stun tube (C) toward the old man, and a final K on the nozzle αυ.
A positioning tool (with a positioning tool) that gives it a fixed position is used.

As shown in FIG. 9, the above-mentioned right angle ruler (A) is a device consisting of a plate-shaped main body part (26a) and a contact part (26b) that comes into contact with the rear end surface (25a) of the stun tube. teeth,
As shown in FIG. 11, it is composed of a plate-shaped main body (27a) having a notch (27c) at the tip, and a holding part (26b) that holds a propeller blade.

Here, the positioning work of the divided nozzle (6) (toward) in the upper half will be explained. First, remove the guard ring (not shown) of the probe boss Cυ, mark the θ° position (4) and the 90° position (Bl) on the outer circumference of the rear end of the stun tube, and mark the As shown in Figure 10, at the 00 position, the rear end surface of the stun tube (25a)
Place a square ruler (E) on the holder and secure it with a jack bolt. A mark (C) is hung from this square ruler (E) at a position equal to the distance axis at the rear end surface (reference surface) i of the nozzle aυ at the predetermined mounting position from the rear end surface C25a) of the stun tube. υ, prove the location of this landmark (C)! 2N) and set that position as point D. Then, point D of propeller boss η, point 00 on the outer periphery of the rear end of the stun tube, and point 90° (Bl and
Connect the 00 point (hull centerline position) (E) of the nozzle Uυ with piano wire (or thread). Next, measure the distance 11(l, For example, the correct mounting angle of this nozzle (11) can be determined. Next, a positioning jig is fixed to an arbitrary propeller blade (c) with bolts 011 facing toward the ship. At this time, as shown in FIG. 11, from the opening (27d) formed in the holding part (27b) of the positioning jig (A), the opening (27d) extends between the holding part (27b) and the propeller blade (C). Mark the eye mark (F). In this way, even if the positioning jig (1d) is displaced, it can be easily restored to its original position. And the first
As shown in Figures 3 and 14, the notch (27c) at the tip of the positioning jig is located at the 00 point (
E) and the rear end of the nozzle (B) and the notch (
27c) in the fore-and-aft direction and the radial direction (X) (
Measure Y).

Then, by rotating the propeller blade (E) along the nozzle (B) and moving the nozzle (Ill) so that each distance aO (2) is constant, the divided nozzle (2) in the upper half is moved. (2) Accurate positioning with respect to the hull aη can be performed.After that, the split nozzle (J
20 is welded and fixed to the hull (17). Note that this welding and fixing work may be performed in the dock, depending on the case.

By the way, in welding between split nozzles @(2) or between split nozzle 403 and hull Q7), welding inside nozzle αυ is performed on the upper plate (128X13B) and lower plate (12A) (13A) of split nozzle 0203. Construction hole 132 provided
It starts from +.

Also, this construction hole □□□ will be closed at the end.

When the installation of the divided nozzle (2) 0 in the upper half is completed, the hull←η is moved to the dock and the third and fourth divided nozzles (
141 (install 151. First, install the third divided nozzle (9
) via a wire using a crane or the like and align it with the second split nozzle (to). At this time, the first divided nozzle Q
4 is! It is easily guided to a predetermined position by a guide plate QQl fixed to the end of the two-split nozzle.

Furthermore, the joining metal fittings (18A
X18B) to match each other by fine adjustment, and bolt 01
Connect each other. Similarly, the first divided nozzle α
Align G with the first split nozzle (6), and attach the joint fitting (18
AX18B). In this way, when the perfect circle state in the lower half of the nozzle αυ is restored, the second and first divided nozzles aa a< and the first and fourth divided nozzles Q
2Qυ and the second and fourth divided nozzles f, t3
After welding a stopper bee (not shown) to the joint between J3 and the shoe piece of the hull Oη, we finally installed the split nozzle 041Q in the lower half! 9 is the hull αη
be welded and fixed. In addition, the above-mentioned upper and lower divided nozzles σ cleaning θ4
) and ■00 are partially opened (shown in Figure 7 G and H) to allow welding inside the nozzle, as the distance between the upper and lower plates is small. Shi, and finally it is blocked.

According to the above method, the period during which the dock is used can be significantly reduced, and since the stern nozzle is divided into four parts, there is no need to remove the propeller when attaching the stern nozzle to the hull.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing how the stern nozzle is installed, Fig. 2 is a view showing the conventional mounting method, Figs. FIG. 4 is an exploded perspective view of the nozzle, FIG. 4 is an enlarged perspective view of the center placket, FIG. 5 is a sectional view of the same, FIG. 6 is a perspective view of the joint fitting, FIG. Figure, Figure 10, Figure 12
FIG. 13 is a sectional view showing a comparative example according to the method. Cl1l...stern nozzle, 0...first division nozzle,
Q3-゛Single joint fitting, mountain...guide plate, C21)...
・Propeller boss, (E)... Stun tube, (25
a)...Rear end surface, (E)...Right angle ruler, (B)...
・Positioning jig, (c)...-propeller different agent
Yoshihiro Morimoto Figure 1 Rod 2 Figure 1153 Figure Valley'! ;5 F Yu'1 6th [mi1 Figure 7 rf't B tl<11 , Xi,, f'(5101・''f1Figure 12-X 2nta-1-/- m/4to1 T lower 151st month 1st θF”

Claims (1)

[Claims] 1. Manufactured by dividing the stern nozzle into four parts, top, bottom, left and right.
Next, when the hull to which the stern nozzle will be attached is in a berthed state, the two split nozzles on the upper half are fixed to the hull, and then this hull is moved to the dock and the two split nozzles on the lower half are installed. Features a stern nozzle installation method.