CN114441117A - Method for detecting tightness of side suction port of trailing suction ship - Google Patents
Method for detecting tightness of side suction port of trailing suction ship Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
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Abstract
The invention relates to a method for detecting the tightness of a trailing suction side suction port of a trailing suction ship. The tightness detection of the suction port on the side of the trailing suction ship under the two conditions of positive pressure and negative pressure can be realized only by utilizing the water suction pump and the self equipment of the trailing suction ship without docking or diving operation and shore-based support; the pressure relief rate index is used as an evaluation index of the sealing performance of the broadside suction port, the pressure relief rate index is easy to calculate and obtain, and a scientific evaluation method is established for the sealing performance detection of the broadside suction port; the detection method is accurate, strong in operability, high in detection efficiency and high in safety, and the suction port on the other side of the trailing suction boat can be detected while single trailing construction is carried out, so that construction and detection of the trailing suction boat are realized.
Description
Technical Field
The invention belongs to the technical field of dredging engineering, and particularly relates to a method for detecting the tightness of a side suction port of a trailing suction ship.
Background
Two harrow pipes are generally arranged on two sides of a ship board of the harrow suction ship, the end parts of the harrow pipes are provided with harrow heads, the harrow heads are utilized to break earth in the sailing process of the harrow suction ship, the harrow pipes are put into water through a harrow pipe hanger, suction ports of elbow parts of the harrow pipes are in butt joint with suction ports of the ship board side, the butt joint faces are provided with rubber rings to ensure that the suction ports are sealed, and a closed conveying pipeline from the harrow heads to a mud pump is formed, as shown in figure 1. The mud pump of the drag suction ship is divided into an in-cabin pump and a drag arm pump, wherein the in-cabin pump is positioned in a ship pump cabin, and the drag arm pump is arranged on a drag arm. When the drag suction ship uses an in-cabin pump to suck mud, the joint of the elbow suction port of the drag pipe and the broadside suction port generally presents negative pressure (the absolute pressure is less than the standard atmospheric pressure); when the drag suction boat uses the drag arm pump to suck mud, the joint of the elbow suction port of the drag pipe and the broadside suction port generally presents positive pressure (the absolute pressure is greater than the standard atmospheric pressure).
In actual work progress, the butt joint department of harrow pipe elbow suction inlet and hull topside suction inlet often causes because of reasons such as wearing and tearing, corrosion not tight sealedly, and the intraductal negative pressure or the malleation circumstances of topside suction inlet department can appear leaking, can lead to clear water to flow into intraductally mud that causes of negative pressure to be diluted, harrow suction ship production efficiency decline, can lead to during the positive pressure mud to leak and cause water pollution and the decline of income cabin flow.
During the construction process of the trailing suction ship, the broadside suction port is always positioned below the water surface, when the butt joint of the rake pipe elbow suction port and the hull broadside suction port is not sealed tightly, the severity of the problem can be judged only through experience or docking inspection at present, a method which can be implemented on the construction site and can be used for scientific detection and evaluation is lacked, and a scientific basis cannot be provided for ship construction and maintenance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a detection method for the tightness of a suction port on the side of a trailing suction ship board, which does not need ship docking or diving operation and shore-based support, has the advantages of accuracy, strong operability, high detection efficiency and high safety, realizes scientific detection of the tightness of the suction port on the side of the trailing suction ship board under positive pressure and negative pressure conditions, and can detect the suction port on the other side of the trailing suction ship while single trailing construction is carried out on one side of the trailing suction ship, so that the influence on the construction operation of the trailing suction ship is low.
The invention is realized in this way, a method for detecting the leak tightness of a trailing suction side suction port of a trailing suction ship, a pressure gauge is arranged at the bottom of a pipeline between the side suction port and a suction port gate valve, and the leak tightness of the side suction port is detected by adopting different detection methods under two conditions of positive pressure and negative pressure in the pipeline at the side suction port:
(1) the side suction port is internally pressurized by positive pressure
The harrow tube is lifted to the deck surface to enable the water in the harrow tube to flow out, and the side suction opening is spaced from the deck surfaceThe height from the still water surface is h1The reading of the pressure gauge is the water pressure head rho gh at the side suction port of the trailing suction ship1；
Closing a suction port gate valve, starting each harrow pipe hanger and a winch to ensure that the position of a harrow pipe suction port is the lowest and the position of a harrow head is the highest, slowly lowering the whole harrow pipe at a certain angle with the horizontal plane, and keeping the middles of the harrow head and the harrow pipe above the water surface when the harrow pipe suction port is butted with the broadside suction port;
keeping a drag winch in the drag still, slowly lowering a drag head winch until the drag head is immersed in water, so that two ends of a drag pipe are water bodies, and the middle part of the drag pipe is closed air;
then synchronously lowering a drag head winch and a drag center winch to ensure that the lower part of the drag pipe is filled with water and the upper part of the drag pipe is filled with air, wherein the height of the interface of the water and the air in the drag pipe from the hydrostatic surface is h2The reading of the pressure gauge is equal to the water pressure rho gh at the interface of the water body and the air in the rake pipe2；
Keeping the posture of the harrow tube unchanged, observing the reading of a pressure gauge, and if the reading of the pressure gauge is continuously constant and the water surface at the upper part of the topside suction port does not splash, indicating that the topside suction port has good sealing performance; if the water surface at the upper part of the topside suction port is splashed with water and the reading of the pressure gauge is slowly reduced, the topside suction port is indicated to be not tightly sealed when bearing positive pressure, and the reading of the pressure gauge is recorded from rho gh2Down to ρ gh1Time t of1Calculating the pressure relief rate
(2) The side suction port is internally born with negative pressure
Arranging a water pump and a driving motor on the deck surface of the drag suction ship, lifting a drag pipe to the deck surface and placing the drag pipe on a drag frame, leading a crew into the drag pipe from a drag pipe suction port, leading a water suction pipe into the drag pipe, leading a suction head of the water suction pipe to be fixed near the drag pipe suction port, and leading the other head of the water suction pipe out of the drag head and connecting the suction pipe with the water pump;
the drag suction boat keeps no-load, closes the suction port gate valve, starts each drag pipe hanger and the winch to ensure that the position of the drag pipe suction port is the lowest and the drag head is the highest, the whole drag pipe and the horizontal plane form a certain angle and are slowly lowered down, and when the butt joint of the drag pipe suction port and the shipboard suction port is finished, the middle parts of the drag head and the drag pipe are still above the water surface;
starting a water pump to pump water in the rake pipe, so that the interior of the rake pipe is completely filled with air, and the reading of a pressure gauge is close to 0; at the moment, a mud pump on the other side of the trailing suction ship pumps water into the mud cabin or fills mud into the mud cabin in normal construction, the draught of the trailing suction ship is increased and finally stabilized, and the height of the side suction port from the hydrostatic surface is h4The outside water pressure of the pipeline at the side suction port is rho gh4The water pressure in the pipeline is 0;
observing the reading of the pressure gauge, and if the reading of the pressure gauge is continuously constant, indicating that the sealing performance of the topside suction port is good; if the reading of the pressure gauge is gradually increased, the pressure gauge is not tightly sealed when the suction port on the side is under negative pressure, and the reading of the pressure gauge is recorded to be increased from 0 to rho gh4Time t of2Calculating the pressure relief rate
In the above technical solution, preferably, the suction head of the suction pipe is fixed near the suction port of the harrow pipe by using a permanent magnet.
In the above technical scheme, preferably, the suction pipe is a flexible steel wire ring spiral hose formed by splicing multiple sections.
By rate of pressure relief f1And f2The tightness of the suction port on the side of the trailing suction ship is judged when the suction port bears positive pressure and negative pressure respectively, the greater the pressure relief rate index is, the poorer the tightness is, when the pressure relief rate index exceeds a limit value, the suction port on the side of the trailing suction ship needs to be maintained, otherwise, the production efficiency of the ship and the surrounding water environment of a construction area are influenced.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the method uses the pressure release rate index as the evaluation index of the sealing performance of the broadside suction port, the pressure release rate index is easy to calculate and obtain, and a scientific evaluation method is established for the sealing performance detection of the broadside suction port.
2. The invention can realize the tightness detection of the suction port at the side of the trailing suction ship under the two conditions of positive pressure and negative pressure only by utilizing the self equipment of the water suction pump and the trailing suction ship without docking or diving operation and shore-based support, and the detection conditions are easy to meet.
3. The detection method provided by the invention is accurate, strong in operability, high in detection efficiency and high in safety, the suction port on the other side of the trailing suction boat can be detected while single trailing construction is carried out, the influence on the construction operation of the trailing suction boat is low, and the construction and detection of the trailing suction boat are realized.
Drawings
FIG. 1 is a schematic illustration of a drag suction boat drag tube and side of a boat provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a gate valve and a pressure gauge in a pump chamber according to an embodiment of the present invention;
FIG. 3 is a first schematic diagram of the detection of the positive pressure of the broadside suction port according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the detection of the positive pressure of the broadside suction port according to the embodiment of the present invention;
FIG. 5 is a third schematic view of the detection of the positive pressure in the broadside suction port according to the embodiment of the present invention;
FIG. 6 is a schematic view of the permanent magnet fixing of the suction head of the barrel according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a water pump and suction pipe arrangement provided by an embodiment of the present invention;
FIG. 8 is a first schematic view of the detection of the suction pressure of the broadside suction port according to the embodiment of the present invention;
FIG. 9 is a schematic view of the detection of the suction pressure of the broadside suction port according to the embodiment of the present invention.
In the figure, 1-the upper part of a harrow tube, 2-the suction port of the harrow tube, 3-a slideway, 4-a broadside suction port, 5-a broadside hull, 6-a suction port gate valve, 7-a pressure gauge, 8-the lower part of the harrow tube, 9-a universal joint, 10-a harrow tube hanger, 11-a steel wire rope, 12-a harrow head, 13-air, 14-a water body, 15-a still water surface, 16-a water suction tube, 17-a permanent magnet and 18-a deck surface; 19-water pump and drive motor.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
in the embodiment, a pressure gauge 7 is arranged at the bottom of a pipeline between a topside suction port 4 and a suction port gate valve 6, as shown in fig. 2.
For the two conditions of positive pressure and negative pressure in the pipe at the topside suction port 4, two detection methods are designed for detecting the tightness of the topside suction port 4.
(1) Pressure inside the side suction port 4 (when using the rake arm pump to suck mud)
The harrow tubes are lifted to a deck surface 18 through each harrow tube hanger 10 and a winch, so that water in the harrow tubes flows out through harrow heads 12, and the height of the broadside suction port 4 from a hydrostatic surface is h1The reading of the pressure gauge 7 is the water pressure head rho gh at the suction port 4 of the trailing suction ship board side1。
Closing the suction port gate valve 6, starting the harrow tube hangers 10 and the winches to enable the position of the harrow tube suction port 2 to be lowest and the position of the harrow head 12 to be highest, enabling the whole harrow tube to slowly descend at a certain angle with the horizontal plane, and when the butt joint of the harrow tube suction port 2 and the broadside suction port 4 is completed, the harrow head 12 and the middle part of the harrow tube (hereinafter called harrow middle) are still above the water surface as shown in figure 3.
And keeping the winch in the harrow still, slowly lowering the harrow head winch until the harrow head 12 is immersed in water, so that the two ends of the harrow tube are provided with water bodies 14, and the middle part of the harrow tube is provided with closed air 13, as shown in figure 4.
Then a drag head winch and a drag winch are synchronously lowered, the water 14 at the side suction port 4 end of the original drag pipe flows to the lower part 8 of the drag pipe under the action of gravity, so that the lower part 8 of the drag pipe is filled with the water 14, the closed space at the upper part 1 of the drag pipe is filled with air 13, and the height of the interface of the water 14 and the air 13 in the drag pipe from the hydrostatic surface is h2The reading of the pressure gauge 7 is equal to the water pressure rho gh at the interface of the water body 14 and the air 13 in the rake pipe 213 pressure ρ gh of air in the pipe at the side suction port 42Greater than water pressure rho gh outside the pipe1As shown in the figure 5, the method can be realized,
keeping the posture of the harrow tube unchanged, observing the reading of a pressure gauge 7, and if the reading of the pressure gauge 7 is continuously constant and the water surface at the upper part of the topside suction port 4 does not splash, indicating that the topside suction port 4 has good sealing performance; if the water surface at the upper part of the topside suction port 4 is splashed with water and the reading of the pressure gauge 7 is slowly reduced, the indication shows that the topside suction port 4 is positionedWhen bearing positive pressure, the sealing is not tight, and the reading of the pressure gauge 7 is recorded from rho gh2Down to ρ gh1Time t of1Calculating the pressure relief rate
(2) The inboard suction port 4 is internally born with negative pressure (when using a pump in the cabin to suck mud)
A water pump and a driving motor 19 are arranged on the deck 18 of the drag suction ship, drag pipes are lifted to the deck 18 through various drag pipe hangers 10 and winches and are placed on a drag frame, a crew enters the drag pipes from a drag pipe suction port 2, a water suction pipe 16 is led into the drag pipes, a suction head of the water suction pipe 16 is fixed near the drag pipe suction port 2 by using a permanent magnet 17, and the other head of the water suction pipe is led out from the drag head 12 and is connected with a suction pipe of the water pump, as shown in figures 6 and 7.
The trailing suction ship keeps no-load, the draught of boats and ships is little, close suction inlet gate valve 6, start each harrow pipe gallows 10 and winch, make 2 positions of harrow pipe suction inlet minimum, drag head 12 positions are the highest, the whole certain angle of personally submitting of harrow pipe and level is slowly transferred, when harrow pipe suction inlet 2 and topside suction inlet 4 butt joint are accomplished, drag head 12, harrow pipe middle part still are more than the surface of water, harrow pipe upper portion 1 is full of water 14 this moment, and harrow pipe lower part 8 is full of air 13, as figure 8, the height of topside suction inlet 4 apart from the hydrostatic surface is h this moment3The reading of the pressure gauge 7 is the water pressure head rho gh at the suction port 4 of the trailing suction ship board side3。
And starting a water pump to pump the water body 14 in the rake pipe, wherein the reading of the pressure gauge 7 is gradually reduced, and when the reading of the pressure gauge 7 is close to 0, the water body 14 in the rake pipe is pumped completely, and the rake pipe is completely filled with air 13. At the moment, the mud pump on the other side of the trailing suction ship pumps water into the mud cabin or fills mud into the mud cabin in normal construction, the draught of the trailing suction ship is increased and finally stabilized, as shown in figure 9, the height of the broadside suction port 4 from the hydrostatic surface is h4The outside water pressure of the pipeline at the side suction port 4 is rho gh4Since the water pressure inside the pipe is 0, a difference ρ gh between the pressure inside and outside the pipe is generated4。
The reading of the pressure gauge 7 is observed, and if the reading of the pressure gauge 7 is continuously constant, the tightness of the topside suction port 4 is good; if the reading of the pressure gauge 7 is gradually increased, the gaugeThe port 4 on the port side is not tightly sealed when bearing negative pressure, and the reading of the pressure gauge 7 is recorded to be increased from 0 to rho gh4Time t of2Calculating the pressure relief rate
After detection is finished, the harrow tube is lifted to a deck surface 18 through each harrow tube hanger 10 and a winch and is placed on the harrow frame, a crew enters the harrow tube from the harrow tube suction port 2, the handle of the permanent magnet 17 is moved, the suction force of the permanent magnet 17 is eliminated, and the water suction tube 16 is detached.
By rate of pressure relief f1And f2The tightness of the trailing suction side suction port 4 of the trailing suction ship is judged when the trailing suction side suction port bears positive pressure and negative pressure respectively, the greater the pressure relief rate index is, the poorer the tightness is, when the pressure relief rate index exceeds a limit value, the trailing suction side suction port 4 of the trailing suction ship needs to be maintained, otherwise, the production efficiency of the trailing suction ship and the water environment around a construction area are influenced.
The following is a specific embodiment to illustrate the specific implementation of the present invention:
a certain cabin capacity is 18000 square trailing suction dredger, the light-load draught is 5.5m, the heavy-load draught is 11m, the diameter of a trailing tube is 1.2m, the length of the trailing tube is 45m, two trailing arms are arranged on two sides, a trailing arm pump is arranged in the middle of a left trailing tube, mud is pumped by the trailing arm pump and is loaded in a cabin, a right trailing arm pump is not provided with the trailing arm pump, and mud is pumped by an in-cabin pump and is loaded in the cabin. During construction, the tightness of the two side suction ports 4 is checked, and a critical value of the positive pressure relief rate of 0.02 mH is set2O/s, critical value of negative pressure relief rate of 0.01 m.H2And O/s. The operation process is as follows:
(1) detection of tightness of left rake broadside suction port 4
Lifting the left harrowing pipe to the deck surface 18, wherein the draught at the suction port 4 on the side of the harrowing and sucking ship is 5.5m, and the reading of a pressure gauge 7 is 0.55 bar; closing the suction port gate valve 6, starting the rake pipe hangers 10 and the winches to enable the positions of the rake pipe suction ports 2 to be lowest and the positions of the rake heads 12 to be highest, enabling the whole rake pipes to slowly descend at a certain angle with the horizontal plane, enabling the rake pipe suction ports 2 to descend along the slide ways, and enabling the rake heads 12 and the middles of the rake pipes (in the lower rake) to be still above the water surface when the butt joint of the rake pipe suction ports 2 and the broadside suction ports 4 is completed, as shown in fig. 3. HoldingThe drag head winch is slowly lowered until the drag head 12 is immersed in water, the two ends of the drag pipe are water bodies 14, and the middle part of the drag pipe is closed air 13, as shown in fig. 4. Then synchronously lowering a drag head winch and a drag center winch, wherein the water body 14 at the side suction port 4 end of the original drag pipe flows to the lower part 8 of the drag pipe under the action of gravity, and the drag head 12 and the drag center are lowered to a certain depth, and then the posture of the drag pipe is kept, and the reading of a pressure gauge 7 is 1.25bar at the moment, as shown in figure 5. Observing the water surface at the upper part of the topside suction port 4 to have water splash and a large amount of bubbles to float out of the water surface, slowly reducing the reading of the pressure gauge 7, recovering the reading of the pressure gauge 7 to 0.55bar after 70s, keeping stable, indicating that the topside suction port 4 is not tightly sealed when bearing positive pressure, and calculating the pressure relief rate
Exceeds the critical value of the pressure relief rate by 0.02 mH2O/s。
(2) Tightness detection of right rake board side suction port 4
A small-sized movable water pump and a driving motor 19 are arranged on the deck 18 of a trailing suction ship by utilizing a crane of the trailing suction ship, the rated flow of the water pump is 100 square/hour, the power of the motor is 30kw, a sailor carries a flexible steel wire ring spiral hose with the pipe diameter of 80mm and the length of 10m to enter a trailing suction pipe, 6 sections of the hoses are spliced section by section to form a water suction pipe 16, the suction head of the water suction pipe 16 is fixed near the suction port 2 of the trailing suction pipe by using a permanent magnet 17, and the other end of the water suction pipe is led out from the trailing suction head 12 and connected with the suction pipe of the water pump, as shown in figures 6 and 7. The drag suction ship keeps no load and draught of 5.5m, the suction port gate valve 6 is closed, each drag pipe hanger 10 and the winch are started, the position of the drag pipe suction port 2 is lowest, the position of the drag head 12 is highest, the whole drag pipe is slowly transferred at a certain angle with the horizontal plane, the drag pipe suction port 2 descends along the slideway 3, when the butt joint of the drag pipe suction port 2 and the shipboard suction port 4 is completed, the middle parts of the drag head 12 and the drag pipe are still above the water surface, at the moment, the upper part 1 of the drag pipe is filled with a water body 14, the lower part 8 of the drag pipe is filled with air 13, and as shown in figure 8, the reading of a pressure gauge 7 is 0.55bar at the moment. And starting a water pump to pump the water body 14 in the rake pipe, and after 8min, gradually reducing the reading of a pressure gauge 7 to 0.03bar, wherein the water pump cannot continuously drain, which indicates that the water body 14 in the rake pipe is completely pumped, the rake pipe is filled with air 13, and only water with the bottom of about 0.3m is left. Then left harrow for harrow suction boatIn common construction, slurry is filled into the cabin, the draught of the trailing suction ship is increased to 8m and then the trailing suction ship is kept stable, as shown in fig. 9, the external water pressure of the pipeline at the side suction port 4 is 0.8bar, and the internal water pressure of the pipeline is 0.03bar, so that the difference between the internal pressure and the external pressure of the pipeline is 0.77 bar. Observing the reading of the pressure gauge 7, keeping the reading of the pressure gauge 7 at 0.03bar after 5min, and keeping the pressure relief rate f2＝0m·H2O/s, indicating that the port side suction port 4 is well sealed when subjected to negative pressure.
After detection is finished, the harrow tubes are lifted to a deck surface 18 through each harrow tube hanger 10 and a winch and are placed on the harrow frame, a crew enters the harrow tubes from the harrow tube suction port 2, the handles of the permanent magnets 17 are moved, the suction force of the permanent magnets 17 is eliminated, and the water tubes are detached.
The tightness detection of the suction port 4 on the side of the trailing suction ship under positive pressure and negative pressure can be realized only by utilizing the water pump and the self equipment of the trailing suction ship without docking or diving operation and shore-based support; the pressure release rate index is used as the evaluation index of the tightness of the broadside suction opening 4, the pressure release rate index is easy to calculate and obtain, and a scientific evaluation method is established for the tightness detection of the broadside suction opening 4. The detection method is accurate, strong in operability, high in detection efficiency and high in safety, and the suction port on the other side of the trailing suction boat can be detected while single trailing construction is carried out, so that construction and detection of the trailing suction boat are realized.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a detection method of trailing suction ship topside suction inlet leakproofness, its characterized in that installs the manometer bottom the pipeline between topside suction inlet and suction inlet slide valve, to two kinds of circumstances of the intraductal malleation and the negative pressure that bear of topside suction inlet department, adopts different detection methods to carry out the leakproofness of topside suction inlet and detects:
(1) the side suction port is internally pressurized by positive pressure
Lifting the harrow tube to the deck surface to ensure that the harrow tubeThe inner water flows out, and the height of the topside suction port from the hydrostatic surface is h1The reading of the pressure gauge is the water pressure head rho gh at the side suction port of the trailing suction ship1；
Closing a suction port gate valve, starting each harrow pipe hanger and a winch to ensure that the position of a harrow pipe suction port is the lowest and the position of a harrow head is the highest, slowly lowering the whole harrow pipe at a certain angle with the horizontal plane, and keeping the middles of the harrow head and the harrow pipe above the water surface when the harrow pipe suction port is butted with the broadside suction port;
keeping a drag winch in the drag still, slowly lowering a drag head winch until the drag head is immersed in water, so that two ends of a drag pipe are water bodies, and the middle part of the drag pipe is closed air;
then synchronously lowering a drag head winch and a drag center winch to ensure that the lower part of the drag pipe is filled with water and the upper part of the drag pipe is filled with air, wherein the height of the interface of the water and the air in the drag pipe from the hydrostatic surface is h2The reading of the pressure gauge is equal to the water pressure rho gh at the interface of the water body and the air in the rake pipe2；
Keeping the posture of the harrow tube unchanged, observing the reading of a pressure gauge, and if the reading of the pressure gauge is continuously constant and the water surface at the upper part of the topside suction port does not splash, indicating that the topside suction port has good sealing performance; if the water surface at the upper part of the topside suction port is splashed with water and the reading of the pressure gauge is slowly reduced, the topside suction port is indicated to be not tightly sealed when bearing positive pressure, and the reading of the pressure gauge is recorded from rho gh2Down to ρ gh1Time t of1Calculating the pressure relief rate
(2) The side suction port is internally born with negative pressure
Arranging a water pump and a driving motor on the deck surface of the drag suction ship, lifting a drag pipe to the deck surface and placing the drag pipe on a drag frame, leading a crew into the drag pipe from a drag pipe suction port, leading a water suction pipe into the drag pipe, leading a suction head of the water suction pipe to be fixed near the drag pipe suction port, and leading the other head of the water suction pipe out of the drag head and connecting the suction pipe with the water pump;
the drag suction boat keeps no-load, closes the suction port gate valve, starts each drag pipe hanger and the winch to ensure that the position of the drag pipe suction port is the lowest and the drag head is the highest, the whole drag pipe and the horizontal plane form a certain angle and are slowly lowered down, and when the butt joint of the drag pipe suction port and the shipboard suction port is finished, the middle parts of the drag head and the drag pipe are still above the water surface;
starting a water pump to pump water in the rake pipe, so that the interior of the rake pipe is completely filled with air, and the reading of a pressure gauge is close to 0; at the moment, a mud pump on the other side of the trailing suction ship pumps water into the mud cabin or fills mud into the mud cabin in normal construction, the draught of the trailing suction ship is increased and finally stabilized, and the height of the side suction port from the hydrostatic surface is h4The outside water pressure of the pipeline at the side suction port is rho gh4The water pressure in the pipeline is 0;
observing the reading of the pressure gauge, and if the reading of the pressure gauge is continuously constant, indicating that the sealing performance of the topside suction port is good; if the reading of the pressure gauge is gradually increased, the pressure gauge is not tightly sealed when the suction port on the side is under negative pressure, and the reading of the pressure gauge is recorded to be increased from 0 to rho gh4Time t of2Calculating the pressure relief rate
2. The method for testing the tightness of a suction port at the side of a trailing suction vessel as claimed in claim 1, wherein said suction head of said suction pipe is fixed to the vicinity of said suction port of said trailing tube by a permanent magnet.
3. The method for detecting the tightness of the suction port at the side of the trailing suction vessel as claimed in claim 1, wherein the suction pipe is a flexible steel wire loop spiral hose formed by splicing a plurality of segments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111597711.8A CN114441117A (en) | 2021-12-24 | 2021-12-24 | Method for detecting tightness of side suction port of trailing suction ship |
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| CN202111597711.8A CN114441117A (en) | 2021-12-24 | 2021-12-24 | Method for detecting tightness of side suction port of trailing suction ship |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115712A (en) * | 2013-01-28 | 2013-05-22 | 中交天津航道局有限公司 | Method for testing dragging force of rake pipe of trailing suction dredger |
| CN210005187U (en) * | 2019-06-22 | 2020-01-31 | 中交天航滨海环保浚航工程有限公司 | Pressure testing device for trailing suction hopper dredger |
| CN113465843A (en) * | 2021-07-21 | 2021-10-01 | 上海外高桥造船有限公司 | Equipment and method for detecting tightness of ship pipeline system |
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2021
- 2021-12-24 CN CN202111597711.8A patent/CN114441117A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115712A (en) * | 2013-01-28 | 2013-05-22 | 中交天津航道局有限公司 | Method for testing dragging force of rake pipe of trailing suction dredger |
| CN210005187U (en) * | 2019-06-22 | 2020-01-31 | 中交天航滨海环保浚航工程有限公司 | Pressure testing device for trailing suction hopper dredger |
| CN113465843A (en) * | 2021-07-21 | 2021-10-01 | 上海外高桥造船有限公司 | Equipment and method for detecting tightness of ship pipeline system |
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