Emergency construction method for single auxiliary pile of double-steel-pile cutter suction dredger

Abstract

The invention relates to a single auxiliary pile emergency construction method for a double-steel-pile cutter suction dredger. According to the method, two auxiliary lines are symmetrically arranged in a digging groove, the distance between the two auxiliary lines can be calculated according to the conditions such as reamer footage, the ends of mooring cables on mooring winches on the two sides of the tail of a ship body are each additionally provided with a swing anchor, the mooring winches are retracted and released to achieve swing of a stern, and auxiliary piles are located on the two auxiliary lines in turn for transverse excavation. And continuous footage of the cutter suction dredger is realized. Continuous footage dredging of the cutter suction dredger can be achieved only through one auxiliary pile and the mooring winch, the cutter suction dredger is high in positioning precision and accurate in footage, ship transformation is not needed, it is guaranteed that the cutter suction dredger can conduct emergency continuous construction when the main pile and the trolley are damaged or break down, and the adaptive capacity of the cutter suction dredger to deal with special working conditions is improved. According to the method, the cutter suction dredger can still continue to construct under the emergency condition that the main pile and / or the trolley of the cutter suction dredger cannot work normally, and the problems that the interest rate is reduced during construction and the construction period is affected due to long-time shutdown of the construction ship are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction methods of cutter suction dredgers, and in particular relates to an emergency construction method of a double-steel-pile cutter suction dredger with a single auxiliary pile. Background Art

[0002] Cutter suction dredgers are one of the most common types of dredgers in dredging projects. Most dredger suction dredgers are equipped with double steel piles, main piles and auxiliary piles. During operation, the bottom of the main pile is fixed in the seabed soil. The main pile is installed on a mobile trolley. The hull moves forward or backward under the push of the trolley hydraulic cylinder. The auger of the dredger suction dredger moves in an arc around the main pile under the action of the transverse system to achieve continuous excavation. The function of the auxiliary pile is to temporarily drop the steel pile to fix the ship's position when the main pile trolley reaches the maximum stroke and needs to return to zero. The auxiliary pile does not participate in the excavation process of the dredger suction dredger, and the main pile and trolley system are subjected to the effects of auger excavation, water flow and wave force for a long time, which are often prone to impact damage or fatigue damage, resulting in the main pile or trolley being unable to be used. The dredger suction dredger cannot move the auger forward or backward, and the dredger suction dredger must face a long period of shutdown. As shown in the attached Figure 1 and attached Figure 2 as shown in .

[0003] If the dredger suction dredge is to be guaranteed to continue construction without using main piles and trolleys, a new excavation construction method needs to be developed relying on existing equipment for the dredger suction dredge that is not equipped with other positioning equipment. Summary of the invention

[0004] The purpose of the present invention is to provide an emergency construction method for a double steel pile cutter suction dredger with a single auxiliary pile, so that in an emergency situation where the main pile and / or the trolley cannot work normally, the cutter suction dredger can still continue construction, thereby avoiding the problem of a decrease in construction time and affecting the construction period due to a long-term shutdown of the construction vessel.

[0005] The technical solution adopted by the present invention is: a double steel pile cutter suction ship single auxiliary pile emergency construction method, comprising the following steps:

[0006] Step S1, two auxiliary lines are symmetrically arranged between two trenching edges, the auxiliary pile is located at the point O on one side of the auxiliary line, two transverse anchors are thrown out of the trench by an anchor boat, a swing anchor is installed at each end of the mooring cable on the mooring winch on both sides of the stern of the hull, and two swing anchors are thrown out of the trench by an anchor boat, the starting point of the auger excavation is set at point A, the mooring cable is loosened, the transverse winch is started, and the auger rotates around point O to the intersection point B of the digging arc and the auxiliary line, and stops dredging;

[0007] Step S2, close the auger, keep the auger head in contact with the mud surface at point B, raise the auxiliary pile, start the mooring winches on both sides of the stern of the hull, tighten the mooring rope, collect one side of the mooring rope and release the other side, so that the hull rotates around point B until the auxiliary pile moves to point M on the auxiliary line on the other side, drop the auxiliary pile, and loosen the mooring rope;

[0008] Step S3, start the auger, start the transverse winch to continue dredging, the hull rotates around point M, and after the auger head excavates to point C of the edge line, the auger is lifted off the mud surface, the hull quickly swings in the opposite direction to point D on the auxiliary line where the auger and the auxiliary pile are located, the auger is closed, the auger head is lowered to contact the mud surface, the auxiliary pile is lifted, the mooring winches on both sides of the stern of the hull are started, and after tightening the mooring rope, one side of the mooring rope is collected and the other side is released, the hull rotates around point D until the auxiliary pile moves to point N on the auxiliary line on the other side, the auxiliary pile is dropped, and the mooring rope is loosened;

[0009] Step S4, the auger is lifted off the mud surface, the transverse winch is started, the hull is quickly swung to point E on the starting edge line, the auger is started, the auger head is lowered to contact the mud surface, the transverse winch is started to start dredging, and the auger is rotated around point N to the intersection point F of the digging arc and the auxiliary line, and dredging stops;

[0010] Step S5, repeating steps S1 to S4 to achieve continuous emergency construction of a single auxiliary pile by a dredger suction vessel.

[0011] Preferably, the method for determining the auxiliary line spacing in step S1 is:

[0012] Assume BM=BO=l,NO=a,MP=x,

[0013] Then BN=la,

[0014] In ΔBMP there is BM 2 =MP 2 +BP 2 ,

[0015] Right now

[0016] The auxiliary line spacing is

[0017] The advantages and positive effects of the present invention are:

[0018] The present invention provides an emergency construction method for a double-steel-pile cutter suction vessel with a single auxiliary pile. The cutter suction vessel uses a mooring winch to swing the stern of the vessel so that the auxiliary pile is always located on the auxiliary line for transverse excavation. The present invention can achieve continuous footage of the cutter suction vessel with only one auxiliary pile and a mooring winch, ensuring that the cutter suction vessel can perform emergency continuous construction when the main pile or trolley is damaged or fails, thereby improving the adaptability of the cutter suction vessel to special working conditions.

[0019] (1) The present invention symmetrically arranges two auxiliary lines in the trench, calculates the distance between the two auxiliary lines based on the hull size, excavation depth, cutter penetration and other conditions of the dredger suction dredge, completes the arrangement of the auxiliary lines, and obtains the auxiliary navigation diagram for the dredger suction dredge construction.

[0020] (2) The present invention adds a swing anchor to each end of the mooring cable on the mooring winches on both sides of the stern of the hull, without the need for other ship modifications. The swing anchor is thrown outside the trench, and the auger head contacts the mud surface to keep the auger position fixed. The auxiliary pile coordinates are moved by retracting and extending the mooring winch.

[0021] (3) The auxiliary piles are placed on two auxiliary lines in turn, and the cutter positioning accuracy of the suction dredger is high, and the footage is continuous and accurate.

[0022] (4) The present invention can achieve continuous advance of the dredger suction dredge by relying on only one auxiliary pile and a mooring winch, ensuring that the dredger suction dredge can continue construction in an emergency when the main pile or the trolley is damaged or fails, thereby improving the adaptability of the dredger suction dredge to special working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the side view of a double steel pile cutter suction dredger;

[0024] Figure 2 This is a top view of a double steel pile cutter suction dredger;

[0025] Figure 3 is a schematic diagram of step S1 of the construction method;

[0026] Figure 4 is a schematic diagram of step S2 of the construction method;

[0027] Figure 5 is a schematic diagram of step S3 of the construction method;

[0028] Figure 6 This is a schematic diagram of auxiliary line spacing.

[0029] In the figure:

[0030] 1. Axle cutter; 2. Main pile; 3. Auxiliary pile; 4. Trolley; 5. Trench edge line; 6. Auxiliary line; 7. Mooring cable; 8. Swing anchor; 9. Transverse cable; 10. Transverse anchor. DETAILED DESCRIPTION

[0031] In order to further understand the content, features and effects of the present invention, the following embodiments are given to explain in detail.

[0032] See also Figures 3 to 5 The double steel pile cutter suction ship single auxiliary pile emergency construction method of the present invention comprises the following steps:

[0033] Step S1, two auxiliary lines are symmetrically arranged between two trenching edges, the auxiliary pile is located at the point O on one side of the auxiliary line, two transverse anchors are thrown out of the trench by an anchor boat, a swing anchor is installed at each end of the mooring cable on the mooring winch on both sides of the stern of the hull, and two swing anchors are thrown out of the trench by an anchor boat, the starting point of the auger excavation is set at point A, the mooring cable is loosened, the transverse winch is started, and the auger rotates around point O to the intersection point B of the digging arc and the auxiliary line, and stops dredging;

[0034] Step S2, close the auger, keep the auger head in contact with the mud surface at point B, raise the auxiliary pile, start the mooring winches on both sides of the stern of the hull, tighten the mooring rope, collect one side of the mooring rope and release the other side, so that the hull rotates around point B until the auxiliary pile moves to point M on the auxiliary line on the other side, drop the auxiliary pile, and loosen the mooring rope;

[0035] Step S3, start the auger, start the transverse winch to continue dredging, the hull rotates around point M, and after the auger head excavates to point C of the edge line, the auger is lifted off the mud surface, the hull quickly swings in the opposite direction to point D on the auxiliary line where the auger and the auxiliary pile are located, the auger is closed, the auger head is lowered to contact the mud surface, the auxiliary pile is lifted, the mooring winches on both sides of the stern of the hull are started, and after tightening the mooring rope, one side of the mooring rope is collected and the other side is released, the hull rotates around point D until the auxiliary pile moves to point N on the auxiliary line on the other side, the auxiliary pile is dropped, and the mooring rope is loosened;

[0036] Step S4, the auger is lifted off the mud surface, the transverse winch is started, the hull is quickly swung to point E on the starting edge line, the auger is started, the auger head is lowered to contact the mud surface, the transverse winch is started to start dredging, and the auger is rotated around point N to the intersection point F of the digging arc and the auxiliary line, and dredging stops;

[0037] Step S5, repeating steps S1 to S4 to achieve continuous emergency construction of a single auxiliary pile by a dredger suction vessel.

[0038] See also Figure 6 , the method for determining the auxiliary line spacing in step S1 is:

[0039] Assume BM=BO=l,NO=a,MP=x,

[0040] Then BN=la,

[0041] In ΔBMP there is BM 2 =MP 2 +BP 2 ,

[0042] Right now

[0043] The auxiliary line spacing is

[0044] A specific engineering example is given below to illustrate the above method.

[0045] A dredging vessel was put into a dredging project, with a dredging depth of 15m, a swing width of 120m, and a cutter penetration of 1.2m. When the cutter depth was 15m, the horizontal projection length from the cutter head to the auxiliary pile was 105m. Due to the bad sea conditions, the main piles suffered fatigue damage and were at risk of breaking, so construction could not continue. The remaining project volume was 300,000 cubic meters. There was no shipyard around the project site that could meet the needs of steel pile maintenance, so the dredging vessel was facing suspension of work.

[0046] Adopt this double steel pile cutter suction boat single auxiliary pile emergency construction method,

[0047] Reamer penetration a=1.2m,l=105,

[0048] Then the auxiliary line spacing x is calculated as follows:

[0049]

[0050] The swing width of the cutter suction dredger is adjusted to 120-11.2=108.8m, and the distance between the auxiliary line and the adjacent trench edge is

[0051] (108.8-11.2) / 2=48.8m.

[0052] Install 5t swing anchors at the ends of the mooring ropes on the mooring winches on both sides of the stern, tie anchor cables and floats to the swing anchors, use anchor boats to deploy two swing anchors 25m outside the 108.8m trench edge line, and use anchor rods to deploy two transverse anchors 15m outside the 108.8m trench edge line. Adjust the ship's position through two transverse winches and two mooring winches, deploy auxiliary piles on one side of the auxiliary line, start dredging according to this method, and successfully complete the remaining 300,000 cubic meters of dredged soil operation task.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A double steel pile cutter suction ship single auxiliary pile emergency construction method, characterized by: The following steps are included: Step S1, two auxiliary lines are symmetrically arranged between two trenching edges, the auxiliary pile is located at the point O on one side of the auxiliary line, two transverse anchors are thrown out of the trench by an anchor boat, a swing anchor is installed at each end of the mooring cable on the mooring winch on both sides of the stern of the hull, and two swing anchors are thrown out of the trench by an anchor boat, the starting point of the auger excavation is set at point A, the mooring cable is loosened, the transverse winch is started, and the auger rotates around point O to the intersection point B of the digging arc and the auxiliary line, and stops dredging; Step S2, close the auger, keep the auger head in contact with the mud surface at point B, raise the auxiliary pile, start the mooring winches on both sides of the stern of the hull, tighten the mooring rope, collect one side of the mooring rope and release the other side, so that the hull rotates around point B until the auxiliary pile moves to point M on the auxiliary line on the other side, drop the auxiliary pile, and loosen the mooring rope; Step S3, start the auger, start the transverse winch to continue dredging, the hull rotates around point M, and after the auger head excavates to point C of the edge line, the auger is lifted off the mud surface, the hull quickly swings in the opposite direction to point D on the auxiliary line where the auger and the auxiliary pile are located, the auger is closed, the auger head is lowered to contact the mud surface, the auxiliary pile is lifted, the mooring winches on both sides of the stern of the hull are started, and after tightening the mooring rope, one side of the mooring rope is collected and the other side is released, the hull rotates around point D until the auxiliary pile moves to point N on the auxiliary line on the other side, the auxiliary pile is dropped, and the mooring rope is loosened; Step S4, the auger is lifted off the mud surface, the transverse winch is started, the hull is quickly swung to point E on the starting edge line, the auger is started, the auger head is lowered to contact the mud surface, the transverse winch is started to start dredging, and the auger is rotated around point N to the intersection point F of the digging arc and the auxiliary line, and dredging stops; Step S5, repeating steps S1 to S4 to achieve continuous emergency construction of a single auxiliary pile by a dredger suction vessel.

2. The double steel pile cutter suction vessel single auxiliary pile emergency construction method as claimed in claim 1, characterized in that: The method for determining the auxiliary line spacing in step S1 is: Assume BM = BO = l, NO = a, MP = x, Then BN=la, In NΔBMP there is BM 2 =MP 2 +BP 2 , Right now The auxiliary line spacing is

Images