Ship positioning method for construction of square wharf in narrow water area

Abstract

The invention belongs to the technical field of ship positioning, and relates to a ship positioning method for construction of a square wharf in a narrow water area. The method comprises the following steps: prefabricating a bollard; the crane ship moves to the position to be constructed, and the two rear anchor cables are anchored to the water bottom; whether the distance between the crane ship and the shore side exceeds a preset distance or not is judged; if not, the front anchor cable close to the shore side is anchored to the shore; if yes, a bollard is inserted into the hoisting hole of the installed square block, and the bollard is sleeved with the front anchor cable close to the shore side; further judging whether the installed square block prevents the front anchor cable far away from the offshore side from being anchored to the water bottom or not; if not, the front anchor cable far away from the offshore side is anchored to the water bottom; if yes, a bollard is inserted into the hoisting hole of the installed square block, and the bollard is sleeved with the front anchor cable far away from the offshore side. Through the design and application of the movable bollard matched with the hoisting hole in the square block, the positioning requirement of a crane ship during construction of a square wharf in a narrow water area can be met, and dragging of the crane ship is avoided.

Description

Technical Field

[0001] This invention belongs to the field of ship positioning technology, specifically relating to a ship positioning method for construction of block wharves in narrow waterways. Background Technology

[0002] Gravity block quays are a common port structure, assembled from multiple precast concrete blocks. They are robust, durable, and capable of withstanding heavy loads, and are commonly used for cargo loading and unloading or ship berthing. The block structure typically resembles... Figure 1 As shown, multiple lifting holes 11 are provided through the block 10. The upper part of each lifting hole 11 has an outwardly expanding conical hole 111, and the middle or lower part of each lifting hole 11 has a countersunk hole 112. The size of the countersunk hole 112 is larger than the size of the lifting hole 11. The lifting holes 11 and countersunk holes 112 can be round or square. During the construction of the block wharf, a crane vessel connected to a lifting device is required for the lifting, positioning, installation, and adjustment of the block 10. The lifting device includes an openable hook. The hook passes through the conical hole 111 and the lifting hole 11 into the countersunk hole 112 and then opens to lift the block 10.

[0003] Currently, the primary method for positioning crane vessels is by anchoring. Typically, two anchor cables are installed at the bow and two at the stern, using these four cables to achieve anchoring. If close to the shore, the crane vessel can also use a buried anchor on land. However, these methods are not entirely suitable for construction at block wharves in narrow waterways. This is because the crane vessel is positioned perpendicular to the wharf, with the length from bow to stern perpendicular to the length of the wharf. The bow of the crane vessel is closer to the wharf, and the forward anchor cable on that side cannot be deployed due to the block's obstruction. Furthermore, when the land is far from the vessel, anchoring via a buried anchor is also impossible.

[0004] To address these issues, some crane vessels temporarily place a concrete block on top of the installed blocks to act as a bollard for mooring lines. The block is typically made of concrete. The friction between the concrete block and the installed dock blocks helps stabilize the vessel. However, this method is unsuitable for large crane vessels. A large crane vessel's anchor winch weighs approximately 50 tons, and the coefficient of friction between the concrete block and the dock blocks is only about 0.5–0.8. Therefore, the minimum self-weight of the block needs to be over 100 tons. Considering the rough sea conditions, the instantaneous pulling force of the crane vessel is far greater than 50 tons, further increasing the block's weight. This results in a bulky block that is difficult to lift, and the temporary placement of the block on top of the installed blocks carries the risk of slippage and displacement, potentially causing the crane vessel to drag its anchor. Summary of the Invention

[0005] In view of the shortcomings of the related technologies, the present invention provides a method for ship positioning during the construction of a block wharf in a narrow waterway, so as to solve the technical problems mentioned in the background art.

[0006] This invention provides a method for vessel positioning during the construction of a block wharf in a narrow waterway, comprising the following steps: S1. Precast cable bollards, the shape and size of which are adapted to the hoisting holes on the block; S2. Positioning the crane vessel: The crane vessel has two forward anchor cables at its bow and two aft anchor cables at its stern. Step S2 includes: S21. The crane vessel is moved to the construction site, so that the length direction of the crane vessel is perpendicular to the length direction of the wharf of the block to be constructed, and the bow of the crane vessel is brought close to the wharf of the block to be constructed. S22. Anchor the two rear anchor cables to the bottom of the water respectively; S23. Determine whether the distance between the crane vessel and the shore exceeds the preset spacing; if not, anchor the front anchor cable near the shore to the shore; if so, insert a bollard into the hoisting hole on the installed block and loop the front anchor cable near the shore onto the bollard; further determine whether the installed block obstructs the front anchor cable away from the shore from being anchored to the bottom of the water; if not, anchor the front anchor cable away from the shore to the bottom of the water; if so, insert a bollard into the hoisting hole on the installed block and loop the front anchor cable away from the shore onto the bollard.

[0007] In some embodiments, the bow of the crane vessel is also provided with a secondary anchor cable, which is located between the two forward anchor cables; step S23 further includes determining whether the installed block blocks the secondary anchor cable from anchoring to the bottom of the water; if not, then anchoring the secondary anchor cable to the bottom of the water; if so, then inserting a bollard into the hoisting hole on the installed block and looping the secondary anchor cable onto the bollard.

[0008] In some embodiments, the bollard includes a bollard shell and a lower baffle; the bollard shell is a hollow shell with an upper opening, the outer dimensions of the bollard shell are adapted to the lifting hole on the block, and the inside of the bollard shell is filled with concrete; the lower baffle is fitted onto the outer wall of the bollard shell and connected to the upper middle part of the bollard shell, and the outer dimensions of the lower baffle are larger than the size of the conical hole on the block; in step S23, when the bollard is inserted into the lifting hole on the installed block, the lower baffle is pressed against the top surface of the block.

[0009] In some embodiments, the bollard also includes an upper baffle that is fitted onto the outer wall of the bollard shell and connected to the top of the bollard shell.

[0010] In some embodiments, the bollard also includes a lifting point, the lower part of which is embedded in the concrete at the top of the bollard.

[0011] In some embodiments, the height of the lower baffle from the bottom of the bollard is between 0.5 and 1 times the height of the block.

[0012] In some embodiments, the bollard further includes a plurality of annular ribs disposed inside the bollard shell, the plurality of annular ribs being spaced apart along the axial direction of the bollard shell; the outer ring of each annular rib is connected to the inner wall of the bollard shell.

[0013] In some embodiments, the bollard further includes a plurality of vertical ribs disposed inside the bollard shell, the plurality of vertical ribs being arranged circumferentially around the bollard shell; each vertical rib extends axially along the bollard shell and is connected to a plurality of annular ribs.

[0014] In some embodiments, the outer wall of the bollard tapers from top to bottom; the inclination angle of the outer wall of the bollard is between 0° and 5°.

[0015] Based on the above technical solution, the vessel positioning method for construction of a block wharf in narrow waters according to the embodiments of the present invention solves the problem that the anchor cable of the crane vessel cannot be anchored due to obstruction by the block or distance from the shore during the construction of a block wharf in narrow waters by designing and applying movable bollards adapted to the lifting holes on the block. The bollard position can be flexibly and conveniently adjusted according to the positioning needs of the crane vessel, thereby meeting the positioning needs of the crane vessel during the construction of a block wharf in narrow waters. Furthermore, the insertion setting of the bollard in the lifting hole on the installed block avoids the possibility of bollard displacement, thereby preventing the crane vessel from dragging its anchor, significantly improving the accuracy and reliability of crane vessel positioning during the construction of the block wharf, and thus improving the construction quality of the block wharf. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of the block; Figure 2 This is a schematic diagram of the vessel positioning method for the construction of a block wharf in a narrow waterway according to the present invention. Figure 3 This is a schematic diagram of the vessel positioning method for the construction of a block wharf in a narrow waterway according to the present invention (illustrated in point 2). Figure 4 This is a schematic diagram (3) of the vessel positioning method for the construction of a block wharf in a narrow waterway according to the present invention; Figure 5 This is a schematic diagram of the vessel positioning method for the construction of a block wharf in a narrow waterway according to the present invention (Figure 4). Figure 6 This is a schematic diagram (5) of the vessel positioning method for the construction of a block wharf in a narrow waterway according to the present invention; Figure 7 This is a schematic diagram of the cable pile in this invention.

[0017] In the diagram: 10. Cube; 11. Lifting hole; 111. Conical hole; 112. Countersunk hole; 20. Crane vessel; 21. Forward anchor cable; 22. Rear anchor cable; 23. Secondary anchor cable; 30. Bollard; 31. Bollard shell; 32. Upper baffle; 33. Lower baffle; 34. Lifting point; 35. Circular rib; 36. Vertical rib. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "top", "bottom", "inner", "outer", "left", "right", "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] refer to Figures 1 to 7 As shown, this invention provides a vessel positioning method for the construction of a block wharf in a narrow waterway. This method is used to position the crane vessel 20 used in the construction of the block wharf. The accuracy and reliability of the crane vessel 20's positioning directly affect the installation and positioning accuracy and reliability of the blocks 10, thereby affecting the construction quality of the block wharf. The method includes the following steps S1 to S2.

[0022] Step S1: Prefabricate the bollards 30. The shape and dimensions of the bollards 30 are adapted to the lifting holes 11 on the block 10, and multiple bollards 30 are prefabricated. Specifically, the shape of the bollards 30 is designed according to the shape of the lifting holes 11 on the block 10. For example, when the lifting hole 11 on the block 10 is circular, the bollard 30 is cylindrical, and its outer diameter matches the diameter of the lifting hole 11; when the lifting hole 11 on the block 10 is square, the bollard 30 is rectangular, and its outer circumference matches the circumference of the lifting hole 11. Further explanation: the fitting design of the bollards 30 and the lifting holes 11 on the block 10 is a clearance fit design, which facilitates the smooth insertion and removal of the bollards 30 from the lifting holes 11 on the block 10.

[0023] Step S2: Positioning of the crane vessel 20; The crane vessel 20 is equipped with two forward anchor cables 21 at the bow and two aft anchor cables 22 at the stern. Step S2 specifically includes the following steps S21 to S23.

[0024] Step S21: The crane vessel 20 enters the water and moves to the construction location, so that the length direction of the crane vessel 20 is perpendicular to the length direction of the block wharf to be constructed, that is, the crane vessel 20 is positioned perpendicular to the block wharf, and the bow of the crane vessel 20 is close to the block wharf to be constructed, while the stern is away from the block wharf to be constructed.

[0025] Step S22: Anchor the two aft anchor cables 22 on the stern side of the crane vessel 20 to the bottom of the water; specifically, the two aft anchor cables 22 are crossed and then anchored to the bottom of the water to form a diagonal constraint and improve the crane vessel 20's ability to resist wind and waves.

[0026] Step S23: Determine whether the distance between the crane vessel 20 and the shore exceeds the preset spacing. If the distance between the crane vessel 20 and the shore does not exceed the preset spacing, anchor the front anchor cable 21 closest to the shore to the shore. If the distance between the crane vessel 20 and the shore exceeds the preset spacing, insert a bollard 30 into a lifting hole 11 on an installed block 10, with the top of the bollard 30 protruding above the top surface of the block 10, and attach the front anchor cable 21 closest to the shore to the bollard 30. It should be noted that the preset spacing is determined and specifically set by technicians based on whether the front anchor cable 21 closest to the shore can be reliably anchored to the shore at a suitable angle and length.

[0027] Further determine whether the installed block 10 obstructs the anchor cable 21 away from the shore from anchoring to the bottom of the water. If the installed block 10 does not obstruct the anchor cable 21 away from the shore from anchoring to the bottom of the water, then anchor the anchor cable 21 away from the shore to the bottom of the water. If the installed block 10 obstructs the anchor cable 21 away from the shore from anchoring to the bottom of the water, then insert a bollard 30 into a lifting hole 11 on an installed block 10, with the top of the bollard 30 protruding above the top surface of the block 10, and then attach the anchor cable 21 away from the shore to the bollard 30. It is understandable that, because the wharf of the block to be constructed is located on the bow side of the crane vessel 20, the two anchor cables 21 near the shore and away from the shore extend obliquely outward in the direction away from the crane vessel 20, that is, the two anchor cables 21 are outwardly extended, which is different from the form of the two aft anchor cables 22 crossing and then extending outward.

[0028] To further explain, the adaptable design of the bollard 30 and the lifting hole 11 on the block 10 in step S1 facilitates smooth insertion and removal between the bollard 30 and the lifting hole 11 on the block 10, preventing the bollard 30 from getting stuck in the lifting hole 11 on the block 10 and achieving the mobility of the bollard 30. In actual construction, the bollard 30 is lifted by a barge crane and inserted or removed from the lifting hole 11 of the block 10 with the assistance of on-site workers.

[0029] According to the construction process of the block wharf, refer to Figures 2-6 The positioning method of crane vessel 20 during the construction of the block wharf is further explained: like Figure 2 As shown, when installing the lower-layer blocks 10 from the shore to the sea, the crane vessel 20 moves to a position close to the shore and within a preset distance, anchoring the two aft anchor cables 22 to the seabed, anchoring the forward anchor cable 21 closest to the shore to the shore, and anchoring the forward anchor cable 21 furthest from the shore to the seabed, thus positioning the crane vessel 20. Then, the crane vessel 20 uses its lifting device to sequentially install the first lower-layer block 10, the second block 10, ... in the area between the two forward anchor cables 21 forward of the bow, until it is restricted by the forward anchor cable 21 furthest from the shore and cannot continue installing blocks 10. Then, the crane vessel 20 uses the forward anchor cable 21 and the aft anchor cable 22 to lift the crane... The vessel 20 is moved along the length of the block wharf in a direction away from the shore to the next vessel position, continuing the installation of block 10. Understandably, the anchoring positions of the aft anchor cable 22 and the forward anchor cable 21 can be adjusted during construction to meet the moving and positioning requirements of the crane vessel 20. When the crane vessel 20 moves to a distance exceeding the preset spacing from the shore, a bollard 30 is inserted into a lifting hole 11 on an already installed block 10. The forward anchor cable 21 closest to the shore is released from its anchoring on the shore and fitted onto the bollard 30. The forward anchor cable 21 furthest from the shore is temporarily anchored to the seabed because it is not obstructed by the lower installed block 10, thus achieving the positioning of the crane vessel 20. Figure 3As shown, continue the installation of block 10 in the current layer; during the construction process, the specific insertion position of the bollard 30 on the installed block 10 and the anchoring position of other anchor cables can be adjusted to meet the hoisting and positioning requirements of the crane vessel 20. When installing the next layer of blocks 10 from the sea side to the shore, initially the distance between the crane vessel 20 and the shore exceeds the preset spacing. The front anchor cable 21 closer to the shore is still anchored using the bollards 30 inserted into the installed blocks 10, while the front anchor cable 21 farther from the shore is temporarily anchored to the seabed because it is not obstructed by the first layer of installed blocks 10. Figure 4 As shown, the crane vessel 20 uses a hoisting device to install the second layer of blocks 10 sequentially. During this process, the crane vessel 20 is moved along the length of the block wharf towards the shore as needed to continue installing the blocks 10. When the movement of the crane vessel 20 causes the front anchor cable 21, which is far from the shore, to be unable to continue anchoring to the bottom due to being blocked by the installed blocks 10, another bollard 30 is inserted into a hoisting hole 11 on an installed block 10. This releases the anchor of the front anchor cable 21 far from the shore from the bottom of the water and places it on the bollard 30. The front anchor cable 21 near the shore is still anchored using the bollard 30. That is, the two front anchor cables 21 of the crane vessel 20 are anchored using bollards 30 respectively, thereby achieving the positioning of the crane vessel 20. Figure 5 As shown, continue installing block 10; when the crane vessel 20 moves to a distance less than the preset spacing from the shore, disconnect the front anchor cable 21 closest to the shore from the bollard 30 and anchor it to the shore, while the front anchor cable 21 furthest from the shore remains anchored using the bollard 30, thus achieving the positioning of the crane vessel 20, as shown. Figure 6 As shown, continue installing block 10 in the current layer; Referring to the positioning principle of the crane ship 20 mentioned above, continue installing the next layer of block 10 until the installation of all layers of block 10 at the block dock is completed.

[0030] The above illustrative embodiment, through the design of a movable bollard 30 adapted to the lifting hole 11 on the block 10, allows the crane vessel 20 to be positioned when its anchor cable is blocked by the block 10 or too far from the shore and cannot be anchored. The bollard 30 can be inserted into the lifting hole 11 on the block 10 and the anchor cable can be fitted onto the bollard 30. This solves the problem of the crane vessel 20 being unable to anchor during the construction of a block wharf in narrow waters. Furthermore, the position of the bollard 30 can be flexibly and conveniently adjusted according to the positioning requirements of the crane vessel 20. Moreover, the insertion of the bollard 30 into the lifting hole 11 on the installed block 10 avoids the possibility of the bollard 30 shifting, thereby preventing the crane vessel 20 from dragging its anchor. This significantly improves the positioning accuracy and reliability of the crane vessel 20 during the construction of the block wharf, thus improving the construction quality of the block wharf.

[0031] refer to Figures 1 to 7As shown, in some embodiments, the bow of the crane vessel 20 is also provided with a secondary anchor cable 23, which is located between the two forward anchor cables 21; furthermore, the secondary anchor cable 23 is closer to the forward anchor cable 21 that is furthest from the shore. Step S23 also includes determining whether the installed block 10 prevents the secondary anchor cable 23 from anchoring to the bottom of the water; if the installed block 10 does not prevent the secondary anchor cable 23 from anchoring to the bottom of the water, then the secondary anchor cable 23 is anchored to the bottom of the water, such as... Figure 2 , Figure 3 As shown; if the installed block 10 has blocked the secondary anchor cable 23 from anchoring to the bottom of the water, then insert a bollard 30 into a lifting hole 11 on the installed block 10, with the top of the bollard 30 protruding above the top surface of the block 10, and then loop the secondary anchor cable 23 onto the bollard 30, as shown. Figures 4-6 As shown. It can be understood that the secondary anchor cable 23 extends obliquely outward in a direction away from the crane vessel 20 to facilitate the installation of the block 10 in the area between the forward anchor cable 21 and the secondary anchor cable 23 near the shore. This illustrative embodiment, through the arrangement of the secondary anchor cable 23, assists in the positioning of the crane vessel 20, further improving the accuracy and reliability of the crane vessel 20's positioning.

[0032] refer to Figure 1 , Figure 7 As shown, in some embodiments, the bollard 30 includes a bollard shell 31 and a lower baffle 33. The bollard shell 31 is a hollow shell with an upper opening, and its external dimensions are adapted to the lifting hole 11 on the block 10; the bollard shell 31 can be machined from 12mm steel plate. Concrete is poured into the interior of the bollard shell 31 and compacted to give the bollard 30 a certain weight and improve the stability of the shape and size of the bollard 30. The lower baffle 33 is fitted onto the outer wall of the bollard shell 31 and connected to the upper middle part of the bollard shell 31. The lower baffle 33 is annular, including but not limited to circular annular or square annular; the external dimensions of the lower baffle 33 are larger than the size of the conical hole 111 on the block 10. In step S23, when the bollard 30 is inserted into the hoisting hole 11 on the installed block 10, the lower baffle 33 presses against the top surface of the block 10. This means that the bollard 30 is in place, thus realizing the insertion of the bollard 30 on the block 10. The front anchor cable 21 can be placed on the bollard 30 above the lower baffle 33 to anchor the front anchor cable 21.

[0033] Furthermore, the outer wall of the bollard 30 tapers from top to bottom, meaning the bollard 30 has a shape that is thicker at the top and thinner at the bottom, which makes it easier to smoothly insert the bollard 30 into the lifting hole 11 on the block 10. The inclination angle of the outer wall of the bollard 30 can be between 0° and 5°.

[0034] Furthermore, the height of the lower baffle 33 to the bottom surface of the bollard 30 is between 0.5 and 1 times the height of the block 10; this setting ensures the stability of the bollard 30 inserted into the block 10 on the one hand, and avoids the bottom end of the bollard 30 protruding outside the block 10 and interfering with the mud surface or the lower block 10 on the other hand.

[0035] refer to Figure 7 As shown, in some embodiments, the bollard 30 further includes an upper baffle 32, which is sleeved on the outer wall of the bollard shell 31 and connected to the top of the bollard shell 31. The upper baffle 32 is annular, including but not limited to circular or square annular shapes. When the front anchor cable 21 is to be sleeved onto the bollard 30, the front anchor cable 21 is sleeved onto the section of the bollard 30 between the upper baffle 32 and the lower baffle 33. Thus, the upper baffle 32 and the lower baffle 33 limit the attachment position of the front anchor cable 21 on the bollard 30 and prevent the front anchor cable 21 from jumping off the bollard 30.

[0036] refer to Figure 7 As shown, in some embodiments, the bollard 30 further includes a lifting point 34, the lower part of which is embedded in the concrete at the top of the bollard 30. Specifically, the lifting point 34 is made of round steel, and the embedment depth and diameter of the lifting point 34 are set according to the weight of the bollard 30. The setting of the lifting point 34 facilitates the lifting and moving of the bollard 30, improving the portability of the bollard 30.

[0037] refer to Figure 7 As shown, in some embodiments, the bollard 30 further includes a plurality of annular ribs 35 disposed inside the bollard shell 31, the plurality of annular ribs 35 being spaced apart along the axial direction of the bollard shell 31; the outer ring of each annular rib 35 is connected to the inner wall of the bollard shell 31; by setting the annular ribs 35, the radial stiffness and compressive strength of the bollard shell 31 are improved, avoiding deformation or local dents of the bollard 30 under the tension of the front anchor cable 21, thereby enhancing the structural stability and durability of the bollard 30.

[0038] Furthermore, the bollard 30 also includes multiple vertical ribs 36 disposed inside the bollard shell 31, with the multiple vertical ribs 36 arranged circumferentially around the bollard shell 31; each vertical rib 36 extends axially along the bollard shell 31 and is connected to multiple annular ribs 35; through the arrangement of the vertical ribs 36, an interlaced spatial grid-like reinforcing structure is formed with the annular ribs 35, which improves the axial bending resistance and torsional resistance of the bollard 30, reduces stress concentration, and further improves the structural strength and service life of the bollard 30.

[0039] In summary, the vessel positioning method for construction of block wharves in narrow waters of the present invention, through the design and application of movable bollards 30 adapted to the lifting holes 11 on the block 10, solves the problem that the anchor cable of the crane vessel 20 cannot be anchored due to obstruction by the block 10 or its distance from the shore during the construction of block wharves in narrow waters. Furthermore, the position of the bollards 30 can be flexibly and conveniently adjusted according to the positioning requirements of the crane vessel 20, thereby meeting the positioning needs of the crane vessel 20 during the construction of block wharves in narrow waters. Moreover, the insertion-type setting of the bollards 30 within the lifting holes 11 on the installed block 10 avoids the possibility of displacement of the bollards 30, thereby preventing the crane vessel 20 from dragging its anchor. This significantly improves the positioning accuracy and reliability of the crane vessel 20 during the construction of block wharves, thus improving the construction quality of the block wharf.

[0040] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for vessel positioning during the construction of a square wharf in a narrow waterway, characterized in that, Includes the following steps: S1. Precast cable piles, the shape and size of which are adapted to the hoisting holes on the block; S2. Positioning the crane vessel: The crane vessel has two forward anchor cables at its bow and two aft anchor cables at its stern. Step S2 includes: S21. The crane vessel is moved to the construction location, so that the length direction of the crane vessel is perpendicular to the length direction of the construction block wharf, and the bow of the crane vessel is brought close to the construction block wharf. S22. Anchor the two rear anchor cables to the bottom of the water respectively; S23. Determine whether the distance between the crane vessel and the shore exceeds a preset distance; if not, anchor the front anchor cable near the shore to the shore; if so, insert a bollard into the hoisting hole on the installed block and loop the front anchor cable near the shore onto the bollard; further determine whether the installed block prevents the front anchor cable away from the shore from anchoring to the bottom of the water; if not, anchor the front anchor cable away from the shore to the bottom of the water; if so, insert a bollard into the hoisting hole on the installed block and loop the front anchor cable away from the shore onto the bollard.

2. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 1, characterized in that, The bow of the crane vessel is also equipped with a secondary anchor cable, which is located between the two forward anchor cables; step S23 further includes determining whether the installed block is blocking the secondary anchor cable from anchoring to the bottom of the water; if not, then anchor the secondary anchor cable to the bottom of the water; if so, then insert a bollard into the hoisting hole on the installed block and loop the secondary anchor cable onto the bollard.

3. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 1 or 2, characterized in that, The cable pile includes a pile shell and a lower baffle; the pile shell is a hollow shell with an upper opening, and the outer dimensions of the pile shell are adapted to the lifting hole on the block, and the pile shell is filled with concrete; the lower baffle is sleeved on the outer wall of the pile shell and connected to the upper middle part of the pile shell, and the outer dimensions of the lower baffle are larger than the size of the conical hole on the block; in step S23, when the cable pile is inserted into the lifting hole on the installed block, the lower baffle is pressed against the top surface of the block.

4. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 3, characterized in that, The cable pile also includes an upper baffle, which is sleeved on the outer wall of the pile shell and connected to the top of the pile shell.

5. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 3, characterized in that, The bollard also includes a lifting point, the lower part of which is embedded in the concrete at the top of the bollard.

6. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 3, characterized in that, The height of the lower baffle from the bottom of the cable pile is between 0.5 and 1 times the height of the block.

7. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 3, characterized in that, The cable pile also includes multiple annular ribs disposed inside the pile shell, the multiple annular ribs being arranged at intervals along the axial direction of the pile shell; the outer ring of each annular rib is connected to the inner wall of the pile shell.

8. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 7, characterized in that, The cable pile also includes multiple vertical ribs disposed inside the pile shell, the multiple vertical ribs being arranged circumferentially around the pile shell; each of the vertical ribs extends axially along the pile shell and is connected to multiple annular ribs.

9. The method for ship positioning during the construction of a block wharf in a narrow waterway according to claim 1 or 2, characterized in that, The outer wall of the cable pile gradually tapers from the top to the bottom; the inclination angle of the outer wall of the cable pile is between 0° and 5°.

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