CN108750015B - Construction method of channel steel cofferdam floating transportation device - Google Patents

Construction method of channel steel cofferdam floating transportation device Download PDF

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Publication number
CN108750015B
CN108750015B CN201810640161.5A CN201810640161A CN108750015B CN 108750015 B CN108750015 B CN 108750015B CN 201810640161 A CN201810640161 A CN 201810640161A CN 108750015 B CN108750015 B CN 108750015B
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steel cofferdam
double
tugboat
floating
wall steel
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CN108750015A (en
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李勇海
周新亚
章好龙
孙小猛
杨嘉毅
项远方
胡晓东
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China Tiesiju Civil Engineering Group Co Ltd CTCE Group
China Railway Group Ltd CREC
Second Engineering Co Ltd of CTCE Group
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China Tiesiju Civil Engineering Group Co Ltd CTCE Group
China Railway Group Ltd CREC
Second Engineering Co Ltd of CTCE Group
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/62—Towing or pushing equipment characterised by moving of more than one vessel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/02—Restraining of open water
    • E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Transportation (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Revetment (AREA)
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Abstract

The invention discloses a construction method of a shipping busy and narrow-area channel steel cofferdam floating device, which mainly comprises a double-wall steel cofferdam, a tugboat, a side boat and a cable, wherein the method is that the side boat is driven by the tugboat, the side boat drives the double-wall steel cofferdam, and the cable is connected and fixed in multiple directions to ensure that the double-wall steel cofferdam, the tugboat and the side boat are relatively stable and form an integral structure; the double-wall steel cofferdam floating transportation device has the characteristics of simple structure, convenience and reliability in operation and safety, and can be widely applied to projects such as bridges.

Description

Construction method of channel steel cofferdam floating transportation device
Technical Field
The invention relates to the technical field of bridge building construction, in particular to a construction method of a channel steel cofferdam floating transportation device.
Background
In the construction of a railway bridge in a mountain area, the construction is limited by complex terrain and geological conditions, a main bridge pier is inevitably positioned in a channel deepwater area in the engineering, and the foundation needs to be constructed by adopting a double-wall steel cofferdam so as to be matched with the construction of a large-diameter drilling pile group foundation in deepwater. For construction convenience, the cofferdam is usually divided into a plurality of sections for assembly, the bottom sections are transported to a construction site by floating, as shown in fig. 1, the floating system is arranged as follows: the front and the back of the steel cofferdam are respectively provided with a hanging tug and a jacking wheel, and the two sides of the steel cofferdam are symmetrically provided with side boats. The floating transportation principle is as follows: the forward power is provided by the hanging tug and the jacking wheel, and the position of the steel cofferdam is kept relatively stable by the ship at the two sides of the steel cofferdam. Thus, during the floating, it occupies a channel width of two side ship widths + steel cofferdam diameter. However, in a narrow channel where ships pass through the busy channel, the width of the channel occupied by floating transportation of the steel cofferdam is too large, so that channel closure is caused.
Disclosure of Invention
The invention aims to provide a construction method of a channel steel cofferdam floating device, which aims to reduce the width of a channel occupied by the steel cofferdam in floating.
In order to achieve the above purposes, the invention adopts a construction method of a channel steel cofferdam floating device, the floating device comprises a tugboat, a side boat and a double-wall steel cofferdam, the boat body of the side boat is tangent with the outer wall plate of the double-wall steel cofferdam along the length direction, the boat body of the side boat is close to and parallel to the boat body of the tugboat, the bow of the tugboat is close to and directed at the double-wall steel cofferdam and close to the double-wall steel cofferdam, and the construction method comprises the following steps:
calculating the minimum horsepower of the tugboat during the floating transportation according to the resistance area of the double-wall steel cofferdam and the hydrological data of the floating transportation water area, and selecting the model of the tugboat according to the minimum horsepower;
calculating the height of the acting point of the dragging force borne by the double-wall steel cofferdam during the floating transportation according to the size and the distribution condition of the resistance borne by the floating transportation device during the floating transportation, and arranging a climbing lug at the height;
carrying out counterweight ballast on the tugboat and the side boat so as to enable the gravity centers of the tugboat and the side boat to be flush with the positions of the lugs;
during floating transportation, the side boat and the tugboat are both connected with the climbing ears through cables, and the side boat and the tugboat are connected through cables;
and driving the side boat and the double-wall steel cofferdam to travel to the bridge foundation position through the tugboat, and completing the water assembly of the double-wall steel cofferdam.
Preferably, the calculating the minimum horsepower of the tugboat during the floating period according to the resistance area of the double-wall steel cofferdam and the hydrological data of the floating water area, and the selecting the tugboat according to the minimum horsepower comprises the following steps:
calculating the resistance area of the double-wall steel cofferdam according to the stress balance principle, wherein the resistance area comprises a water resistance area and a wind resistance area;
calculating wind resistance and water resistance of the floating device during the floating period according to the resistance area of the double-wall steel cofferdam and hydrological data of a floating water area;
calculating the minimum horsepower of the tugboat according to the wind resistance and the water resistance borne by the floating device;
the model of the tug is selected according to the minimum horsepower of the tug.
Preferably, the method for calculating the height of the acting point of the dragging force borne by the double-wall steel cofferdam during the floating transportation according to the size and distribution of the resistance borne by the double-wall steel cofferdam during the floating transportation, and arranging the climbing lug at the height comprises the following steps:
based on the bending moment balance principle, the height of a towing force acting point is calculated according to the following formula:
Figure BDA0001702119500000021
in the formula: h istFor the height of the dragging force acting point of the double-wall steel cofferdam FWater (W)Is the sum of the resistances of water to the floating device, HWater (W)Is the height of the action point of water resistance; fWind powerThe sum of the resistance of wind to the floating device; hWind powerThe height of the acting point of the wind resistance is;
and a plurality of climbing lugs are arranged at the height of the dragging force acting point of the double-wall steel cofferdam.
Preferably, the height of the traction force acting point of the double-wall steel cofferdam is provided with a plurality of climbing lugs, and the climbing lugs comprise:
the middle of the double-wall steel cofferdam outer wall plate along the advancing direction is provided with a first climbing lug for being connected with a wrapping head cable, the front part of the double-wall steel cofferdam outer wall plate, close to a ship-boarding position, is provided with a second climbing lug for being connected with a towing cable, the rear part of the double-wall steel cofferdam outer wall plate is symmetrically provided with a third climbing lug and a fourth climbing lug for being connected with splayed cables, and the middle of the double-wall steel cofferdam outer wall plate is provided with a fifth climbing lug for being connected with an operating cable.
Preferably, shackles are arranged on the stern, the bow and one side of the hull tangent to the outer wall plate of the double-wall steel cofferdam, and the shackles are arranged on the stern, the bow and two sides of the hull of the tugboat;
the shackle arranged at the stern of the ship side is connected with the shackle arranged at the stern of the tugboat through an operating cable, and the shackle arranged on the hull of the ship side is connected with the shackle arranged on the hull of the tugboat at the side close to the tugboat through the operating cable;
shackles arranged on the bow of the ship side are respectively connected with a first climbing lug on the outer wall plate through a head-wrapping cable and connected with a second climbing lug on the outer wall plate through a towing cable;
shackles arranged at the bow of the tugboat are respectively connected with a third climbing lug and a fourth climbing lug on the outer wall plate through splayed cables;
and the shackle arranged on the hull on the side, away from the side boat, of the tugboat hull is connected with the fifth climbing lug on the outer wall plate through an operating cable.
Compared with the prior art, the invention has the following technical effects: the invention selects the tugboat and the side boat with proper boat types, and arranges a certain number of climbing lugs on the outer wall plate of the double-wall steel cofferdam, wherein the climbing lugs are used for connecting and fixing the side boat and the tugboat in a multi-azimuth way through cables during the floating transportation so as to relatively stabilize the double-wall steel cofferdam, the tugboat and the side boat, thereby forming an integral structure. In the floating transportation device, a tugboat drives a side boat and the side boat drives a double-wall steel cofferdam to carry out floating transportation, the whole device is only powered by the tugboat, the side boat is used for stabilizing the double-wall steel cofferdam, and the width of an occupied channel during the floating transportation of the steel cofferdam is the width of the side boat plus the diameter of the steel cofferdam. Compared with the traditional method that the occupied channel width is the tug width, the side ship width and the steel cofferdam diameter, the occupied channel width during the floating transportation of the steel cofferdam is reduced, and the influence of the eddy phenomenon during the floating transportation of the double-wall steel cofferdam is reduced.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a double-wall steel cofferdam floating device;
FIG. 2 is a schematic flow chart of a construction method of the channel steel cofferdam floating device of the invention;
FIG. 3 is a schematic structural view of a channel steel cofferdam floating device of the invention;
fig. 4 is a schematic view of the position structure of the climbing lug on the outer wall plate of the double-wall steel cofferdam in fig. 3.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 2 to 3, the embodiment discloses a construction method of a channel steel cofferdam floating device, the floating device comprises a tug 1, a ship wall 2 and a double-wall steel cofferdam 3, the ship wall of the ship wall 2 is tangent to the outer wall plate of the double-wall steel cofferdam 3 along the length direction, the ship wall of the ship wall 2 is adjacent to and parallel to the ship wall of the tug 1, and the bow of the tug 1 is directed to the double-wall steel cofferdam 3 and is adjacent to the double-wall steel cofferdam 3. Wherein, the tugboat 1 provides power for the whole floating device, the ship side wall 2 does not need to provide power, and the function of the tugboat is to keep the transverse stability of the double-wall steel cofferdam 3.
The construction steps of the floating device include S101 to S105:
s101, calculating the minimum horsepower of the tug 1 during the floating transportation according to the resistance area of the double-wall steel cofferdam 3 and the hydrological data of the floating transportation water area, and selecting the model of the tug 1 according to the minimum horsepower;
wherein, the water resistance area and the wind resistance area of the double-wall steel cofferdam 33 are calculated according to the stress balance principle, and the specific calculation process is as follows:
Figure BDA0001702119500000041
A0＝L·h，
A1＝L·(H-h)，
in the formula: m is the quality of the steel cofferdam; g is the acceleration of gravity; s is the bottom area of the steel cofferdam; h is the draft of the steel cofferdam; rho is water density; a. the0To receive the water resistance area, A1Is the area of wind resistance; l is the width of the steel cofferdam; h is the total height of the floating steel cofferdam, and the product is represented by- ".
The calculation process of the minimum horsepower of the tug 1 is as follows:
Fhorsepower of＝FWater (W)+FWind power，
Wherein:
Figure BDA0001702119500000051
in the formula: a is the resistance area of the ship and the steel cofferdam; gamma rayωIs the specific gravity of water; v is consignment speed; g is the acceleration of gravity; k is the coefficient of resistance.
FWind power＝A1·βZ·μs·μz·Wo，
Wherein wk is standard value of wind load, β z is wind vibration coefficient at height z, mus is body type coefficient of wind load, muz is height variation coefficient of wind pressure, and W isoThe basic wind pressure is obtained.
The corresponding vessel is then selected as the tug 1 according to the minimum horsepower of the tug 1.
S102, calculating the acting point height of the dragging force applied to the double-wall steel cofferdam 3 during the floating transportation according to the size and distribution condition of the resistance applied to the floating transportation device during the floating transportation, and arranging a climbing lug at the height;
the position of the traction force impact point is determined by a bending moment balance principle, and the specific calculation process is as follows:
Figure BDA0001702119500000052
in the formula: h istThe height of the acting point of the dragging force; fWater (W)The sum of the resistance of water to the ship and the steel cofferdam; hWater (W)Is the height of the action point of water resistance; fWind powerThe sum of the resistance of wind to the ship and the steel cofferdam; hWind powerIs the height of the acting point of the wind resistance.
The welding lug climbing in the embodiment is used for connecting and fixing the steel cofferdam with the tugboat 1 and the side boat 2 during floating transportation, so that the double-wall steel cofferdam 3, the tugboat 1 and the side boat 2 are relatively stable.
S103, carrying out counterweight ballast on the tugboat and the side boat so as to enable the gravity centers of the tugboat and the side boat to be flush with the positions of the lugs;
s104, during floating transportation, the side boat and the tug boat are both connected with the climbing ears through cables, and the side boat and the tug boat are connected through cables;
in the steps, the gravity center positions of the tugboat 1 and the side boat 2 are basically flush with the positions of the lugs through counterweight ballasting, so that the connecting lines of the tugboat 1 and the side boat 2 and the lugs and the connecting lines between the tugboat 1 and the side boat 2 are all located on the same plane, and the relative stability among the side boat 2, the tugboat 1 and the double-wall steel cofferdam 3 is ensured.
And S105, driving the side boat and the double-wall steel cofferdam to travel to the position of the bridge foundation by the tug boat, and completing the water assembly of the double-wall steel cofferdam.
It should be noted that the idea of the floating construction method in this embodiment is to drive the side ship 2 by the tug 1, and drive the double-wall steel cofferdam 3 to move by the side ship 2. The tugboat 1, the side boat 2 and the double-wall steel cofferdam 3 are fixed in multiple directions through cables, so that an integral structure is formed, and the three are relatively stable. Referring to fig. 3, the width of the channel occupied by the steel cofferdam in floating transportation is the diameter of the double-wall steel cofferdam 3 plus the width of the upper ship 2, so that the channel width occupied by the double-wall steel cofferdam 3 in floating transportation is reduced, and the influence of eddy current phenomenon on the double-wall steel cofferdam in floating transportation is reduced. And in the narrow and small area, the busy channel of ship of passing, can avoid causing the channel to seal the navigation because of steel cofferdam floating transportation.
Further, as shown in fig. 4, the specific setting conditions of the ear climbing include: the middle of the outer wall plate of the double-wall steel cofferdam along the advancing direction is provided with a first climbing lug 51 used for being connected with a wrapping head cable, the front part of the outer wall plate of the double-wall steel cofferdam is provided with a second climbing lug 52 used for being connected with a towing cable at a position close to a ship wall, the rear part of the outer wall plate of the double-wall steel cofferdam is symmetrically provided with a third climbing lug 53 and a fourth climbing lug 54 used for being connected with a splayed cable, and the middle of the outer wall plate of the double-wall steel cofferdam is provided with a fifth climbing lug 55 used for being connected with a control cable.
Further, as shown in fig. 3, the ship hull of the ship with side walls 2 is provided with shackles at the stern, at the side of the bow close to the steel cofferdam and at the side tangent to the outer wall plate of the double-wall steel cofferdam 3. Shackles are arranged on the stern, two sides of the bow and two sides of the hull of the tug 1. During the floating transportation, group's ship 2 and tug 1 all connect through hawser and climbing the ear, group's ship 2 and tug 1 connect through the hawser, specifically are:
the shackle arranged at the stern of the side boat 2 is connected with the shackle arranged at the stern of the tugboat 1 through the control cable 2-1, and the shackle arranged at the hull of the side boat 2 is connected with the shackle arranged at the hull of the side boat 1 close to the tugboat 1 through the control cable 1-1; shackles arranged at the bow of the helper 2 are respectively connected with a first climbing lug 51 on an outer wall plate through a head-covering cable 3-1 and connected with a second climbing lug 52 on the outer wall plate through a towing cable 1-2;
shackles arranged on two sides of the bow of the tug 1 are respectively connected with a third climbing lug 53 on the outer wall plate through a splayed cable 4-1 and connected with a fourth climbing lug 54 on the outer wall plate through a splayed cable 4-2;
the shackle arranged on the hull of the tug 1 at the side far away from the side boat 2 is connected with the fifth climbing lug 55 on the outer wall plate through the control cable 2-2.
Specifically, 1 group of 27mm diameter steel cables are used for the towing cables 1-1 and 1-2. The control cable 2-1 uses 2 groups of 27cm diameter steel cables, and the control cable 2-21 uses a group of 27cm diameter steel cables. The head covering cable 3-1 adopts 1 group of steel cables with the diameter of 27mm and 1 group of nylon ropes with the diameter of 50 mm. The splayed cable 4-1 adopts 2 groups of steel cables with the diameter of 27mm, and the splayed cable 4-2 adopts 1 group of nylon ropes with the diameter of 50 mm.
The side ship 2 is connected with the tug 1 through a towing cable 1-1 and an operating cable 2-1 to complete the stress transmission between the two ships and increase the rotation performance of a fleet; the double-wall steel cofferdam is connected with the upper ship 2 through the heading cable 3-1 and the towing cable 1-2, so that the effects of preventing the double-wall steel cofferdam from moving backwards or outwards relative to the upper ship and transferring stress in the floating transportation process are respectively realized; the steel cofferdam is connected with the tug 1 through the splayed cable 4-1, the splayed cable 4-2 and the control cable 2-2, so that the transverse strength of the fleet and the double-wall steel cofferdam is enhanced, and the backing traction force is provided.
During the floating transportation, the tug 1 runs backwards to drive the side boat 2 and the double-wall steel cofferdam to run backwards and leave the shallow water area, and after the double-wall steel cofferdam runs away from the shallow water area, the rudders of the tug 1 and the side boat 2 are adjusted to enable the advancing directions of the tug 1 and the side boat 2 and the steel cofferdam 3 to be parallel.
So, the atress is relatively stable between the three, provides power for whole transportation by water conservancy diversion system through tow boat 1, and the moving direction of entire system when changing double-walled steel cofferdam floating clouds through tow boat 1. An anchoring point is provided for the double-wall steel cofferdam through the side boat 2, the double-wall steel cofferdam is driven to advance and retreat in a synergic mode, the double-wall steel cofferdam is limited to rotate, and the center of gravity of the whole floating transportation system is located on the central line of the tug boat 1. The flexibility of the double-wall steel cofferdam in floating transportation is increased. And the structure is simple, the operation is convenient and reliable, the floating transportation is safe, and the method can be widely applied to the engineering of bridges and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. A construction method of a channel steel cofferdam floating device is characterized in that the floating device comprises a tugboat, a side boat and a double-wall steel cofferdam, wherein the hull of the side boat is tangent to an outer wall plate of the double-wall steel cofferdam along the length direction, the hull of the side boat is close to and arranged in parallel with the hull of the tugboat, the bow of the tugboat points to the double-wall steel cofferdam and is close to and arranged with the double-wall steel cofferdam, and the construction method comprises the following steps:
calculating the minimum horsepower of the tugboat during the floating transportation according to the resistance area of the double-wall steel cofferdam and the hydrological data of the floating transportation water area, and selecting the model of the tugboat according to the minimum horsepower;
calculating the height of the acting point of the dragging force borne by the double-wall steel cofferdam during the floating transportation according to the size and the distribution condition of the resistance borne by the floating transportation device during the floating transportation, and arranging a climbing lug at the height;
carrying out counterweight ballast on the tugboat and the side boat so as to enable the gravity centers of the tugboat and the side boat to be flush with the positions of the lugs;
during floating transportation, the side boat and the tugboat are both connected with the climbing ears through cables, and the side boat and the tugboat are connected through cables;
and driving the side boat and the double-wall steel cofferdam to travel to the bridge foundation position through the tugboat, and completing the water assembly of the double-wall steel cofferdam.
2. The method for constructing a floating installation of a channel steel cofferdam according to claim 1, wherein the calculating of the minimum horsepower of the tug during the floating according to the resistance area of the double-walled steel cofferdam and the hydrological data of the floating water area, and the model selection of the tug according to the minimum horsepower comprises:
calculating the resistance area of the double-wall steel cofferdam according to the stress balance principle, wherein the resistance area comprises a water resistance area and a wind resistance area;
calculating wind resistance and water resistance of the floating device during the floating period according to the resistance area of the double-wall steel cofferdam and hydrological data of a floating water area;
calculating the minimum horsepower of the tugboat according to the wind resistance and the water resistance borne by the floating device;
the model of the tug is selected according to the minimum horsepower of the tug.
3. The construction method of the floating transportation device of the channel steel cofferdam of claim 1, wherein the step of calculating the force acting point height of the dragging force applied to the double-wall steel cofferdam during the floating transportation according to the magnitude and distribution of the resistance applied to the double-wall steel cofferdam during the floating transportation, and arranging the climbing lug at the height comprises the following steps:
based on the bending moment balance principle, the height of a towing force acting point is calculated according to the following formula:
Figure FDA0002394319140000021
in the formula: h istFor the height of the dragging force acting point of the double-wall steel cofferdam FWater (W)Is the sum of the resistances of water to the floating device, HWater (W)Is the height of the action point of water resistance; fWind powerThe sum of the resistance of wind to the floating device; hWind powerThe height of the acting point of the wind resistance is;
and a plurality of climbing lugs are arranged at the height of the dragging force acting point of the double-wall steel cofferdam.
4. The construction method of the floating transportation device of the channel steel cofferdam of claim 3, wherein the step of arranging a plurality of climbing lugs at the height of the acting point of the dragging force of the double-wall steel cofferdam comprises the following steps:
the middle of the double-wall steel cofferdam outer wall plate along the advancing direction is provided with a first climbing lug for being connected with a wrapping head cable, the front part of the double-wall steel cofferdam outer wall plate, close to a ship-boarding position, is provided with a second climbing lug for being connected with a towing cable, the rear part of the double-wall steel cofferdam outer wall plate is symmetrically provided with a third climbing lug and a fourth climbing lug for being connected with splayed cables, and the middle of the double-wall steel cofferdam outer wall plate is provided with a fifth climbing lug for being connected with an operating cable.
5. The construction method of the navigation channel steel cofferdam floating device of claim 4, wherein the stern, bow and hull of the side boat tangent to the double-wall steel cofferdam outer wall plate are provided with shackles, and the stern, bow and both sides of the hull of the tug boat are provided with shackles;
the shackle arranged at the stern of the ship side is connected with the shackle arranged at the stern of the tugboat through an operating cable, and the shackle arranged on the hull of the ship side is connected with the shackle arranged on the hull of the tugboat at the side close to the tugboat through the operating cable;
shackles arranged on the bow of the ship side are respectively connected with a first climbing lug on the outer wall plate through a head-wrapping cable and connected with a second climbing lug on the outer wall plate through a towing cable;
shackles arranged at the bow of the tugboat are respectively connected with a third climbing lug and a fourth climbing lug on the outer wall plate through splayed cables;
and the shackle arranged on the hull on the side, away from the side boat, of the tugboat hull is connected with the fifth climbing lug on the outer wall plate through an operating cable.
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