A method for rapid transportation and installation of an integral prefabricated dry dock

Abstract

The present invention relates to a method for rapid transportation and installation of an integral prefabricated dry dock, which belongs to the technical field of water conservancy engineering. The method comprises the following steps: selecting a site at the edge of an offshore island as a preset position for a dry dock, constructing a dry dock foundation trench whose bottom surface reaches a preset elevation requirement at the preset position of the dry dock, and the side of the dry dock foundation trench close to the offshore is open to form a foundation trench entrance connected to the offshore; using a construction ship to transport a prefabricated dry dock, placing the prefabricated dry dock in the dry dock foundation trench, and fixing it to the dry dock foundation trench; wherein, before transporting the prefabricated dry dock, the dock opening of the prefabricated dry dock is closed; when the prefabricated dry dock is placed in the dry dock foundation trench, the dock opening of the prefabricated dry dock and the foundation trench entrance are located in the same direction. The method for rapid transportation and installation of an integral prefabricated dry dock can rapidly build a dry dock on an offshore island for prefabrication of prefabricated components or maintenance of ships.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy projects, and in particular relates to a method for rapid transportation, installation and construction of an integral prefabricated dry dock. Background Art

[0002] A dry dock is a dock artificially built on the shore, mainly used for building, refitting and repairing ships. The construction process of a dry dock usually includes building a cofferdam, stopping water around the proposed dry dock area, reducing water inside the cofferdam, leveling the land, excavating the foundation pit, laying a gravel cushion, pouring a concrete bottom plate, building a reinforced concrete dock wall, installing a dock mouth, etc. The construction process is very cumbersome, the construction period is long, and the construction efficiency is low.

[0003] In the construction of offshore water conservancy projects, offshore natural islands or artificial islands have important utilization value. As offshore islands for offshore water conservancy projects, it is usually necessary to build a dry dock on the offshore island and build a prefabrication plant in the dock to prefabricate building components for construction. However, the construction period of the prefabrication plant is long and requires the offshore island to have a large enough area. If the prefabrication plant is built on other land sites and the prefabricated components are transported to the island, there is a problem of high transportation costs; at the same time, it is also necessary to build a dry dock on the island or use a floating dock to repair the construction ship. However, building a dry dock on the island has a long construction period, and using a floating dock has high costs and complex operations.

[0004] Therefore, how to quickly build a dry dock on an offshore island for the prefabrication of building components and the maintenance of construction ships is a technical problem that urgently needs to be solved. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a method for rapid transportation, installation and construction of an integral prefabricated dry dock, which can quickly build a dry dock on an offshore island for prefabrication of prefabricated components or maintenance of ships.

[0006] The present invention provides a method for rapid transportation and installation of an integral prefabricated dry dock, comprising the following steps:

[0007] Construction of dry dock foundation trench: select a site at the edge of an offshore island as the preset position for the dry dock, and construct a dry dock foundation trench with a bottom surface that meets the preset elevation requirements at the preset position of the dry dock. The side of the dry dock foundation trench close to the offshore is open to form a foundation trench entrance connected to the offshore;

[0008] Dry dock installation: The prefabricated dry dock is transported as a whole by a construction vessel, placed in the dry dock foundation trench, and fixed to the dry dock foundation trench; before transporting the prefabricated dry dock, the dock opening of the prefabricated dry dock is closed; when placing the prefabricated dry dock in the dry dock foundation trench, the dock opening of the prefabricated dry dock and the entrance of the foundation trench are located in the same direction.

[0009] In some of the embodiments, in the dry dock foundation pit construction steps, the steps of forming the dry dock foundation pit are: excavating a foundation pit at a preset position of the dry dock, constructing a supporting slope while excavating, until the excavation reaches a preset elevation to form a dry dock foundation pit; or, when the offshore island is an artificial island, after the artificial island is filled to a preset elevation, a cofferdam is set at the preset position of the dry dock to enclose the dry dock foundation pit, and the part outside the cofferdam is continued to be filled to form an artificial island, so as to reserve a dry dock foundation pit on the completed artificial island.

[0010] In some of the embodiments, the dry dock foundation pit construction step, after the dry dock foundation pit is constructed, further includes: filling the bottom of the dry dock foundation pit with blocks of stone and tamping it to form a block stone cushion layer, laying crushed stone on the block stone cushion layer and leveling it to form a crushed stone base bed; in the dry dock installation step, the prefabricated dry dock is placed on the crushed stone base bed.

[0011] In some of the embodiments, the construction steps of the block stone cushion layer are: a stone dumping and tamping ship enters the dry dock foundation pit, and gradually performs block stone dumping and tamping construction from one end of the dry dock foundation pit away from the foundation pit entrance toward the foundation pit entrance; the construction steps of the crushed stone base bed are: a leveling ship enters the dry dock foundation pit, and gradually performs crushed stone laying and leveling construction from one end of the dry dock foundation pit away from the foundation pit entrance toward the foundation pit entrance.

[0012] In some of the embodiments, the preset elevation is determined based on the difference between the lowest tide level at low tide at an offshore island and the lowest water level required for a ship to enter and exit the prefabricated dry dock.

[0013] In some of the embodiments, a ballast water tank is provided in the prefabricated dry dock, and a lifting point is provided on the top of the prefabricated dry dock; the construction vessel is a catamaran, and a portion of the space below the connecting bridge of the catamaran and between the two hulls is a cargo space;

[0014] In the dry dock installation step, the specific steps of using a construction vessel to transport the prefabricated dry dock and placing the prefabricated dry dock in the dry dock foundation groove are as follows:

[0015] Dock-ship connection: make the prefabricated dry dock float on the water, drive the catamaran to the top of the prefabricated dry dock and place the prefabricated dry dock in the cargo space of the catamaran, connect the hanging point of the prefabricated dry dock to the catamaran, and keep the relative position of the prefabricated dry dock and the catamaran fixed;

[0016] Transport and sinking: Use a catamaran to transport the prefabricated dry dock to the entrance of the foundation trench, winch the prefabricated dry dock into the dry dock foundation trench through the entrance of the foundation trench, and inject ballast water into the ballast water tank of the prefabricated dry dock so that the prefabricated dry dock can rest on the bottom of the dry dock foundation trench; Alternatively, use a catamaran to transport the prefabricated dry dock as a whole into the dry dock foundation trench, inject ballast water into the ballast water tank of the prefabricated dry dock, and use the catamaran to sink the prefabricated dry dock so that the prefabricated dry dock can rest on the bottom of the dry dock foundation trench.

[0017] In some of the embodiments, the catamaran is a self-propelled immersed tube transporting and installing integrated ship for transporting and sinking immersed tubes, and the width of the prefabricated dry dock is smaller than the distance between the two hulls of the self-propelled immersed tube transporting and installing integrated ship.

[0018] In some of the embodiments, the top of the prefabricated dry dock is open, and before the prefabricated dry dock is transported, the top opening of the prefabricated dry dock is closed.

[0019] In some of the embodiments, a first mooring post is provided at the center of the top of the prefabricated dry dock away from the dock entrance, and a second mooring post is provided near two corners respectively, and a third mooring post is provided near two corners respectively on the top of the prefabricated dry dock near the dock entrance; with the side of the dry dock foundation groove where the foundation groove entrance is provided as the front, before the prefabricated dry dock is moved, a traction winch and at least two first control winches are provided near the rear side of the dry dock foundation groove on the offshore island, the traction winch is located on the center line of the dry dock foundation groove, and the two first control winches are respectively located on the left and right sides of the traction winch and near the left and right sides of the dry dock foundation groove; the catamaran is provided with second control winches near the two hulls;

[0020] In the transportation and sinking step, the specific steps of winching the prefabricated dry dock into the dry dock foundation trench include:

[0021] When the catamaran transports the prefabricated dry dock to the entrance of the base trench, the prefabricated dry dock is temporarily moored and fixed, the connection between the prefabricated dry dock and the catamaran is disconnected, and the catamaran is moved to the side away from the dry dock base trench so that the prefabricated dry dock is located between the catamaran and the entrance of the dry dock base trench, and the catamaran is moored to a stationary position;

[0022] A twisting and shifting traction cable is connected between the first mooring post of the prefabricated dry dock and the traction winch, a first twisting and shifting control cable is respectively connected between the two second mooring posts and the two corresponding first control winches on the offshore island, and a second twisting and shifting control cable is respectively connected between the two second mooring posts and the two corresponding second control winches on the catamaran;

[0023] The traction winch reels in the twisting and moving traction cable, and at the same time, the first control winch reels in the first twisting and moving control cable and the second control winch releases the second twisting and moving control cable to twist and move the prefabricated dry dock into the dry dock foundation trench; during the twisting and moving process, the moving direction of the prefabricated dry dock is controlled by controlling the speed at which the two first control winches reel in the first twisting and moving control cables and the speed at which the two second control winches release the second twisting and moving control cables.

[0024] In some of the embodiments, in the dock-ship connection step, ballast water is injected into the ballast water tank of the floating prefabricated dry dock so that the prefabricated dry dock sinks until the freeboard height of the prefabricated dry dock reaches a first designed freeboard height, and then the prefabricated dry dock is connected to the catamaran, wherein the first designed freeboard height is less than the vertical distance between the bottom surface of the connecting bridge and the water surface when the catamaran floats on the water surface; in the transportation and sinking step, when the prefabricated dry dock is located between the catamaran and the entrance of the foundation pit, the ballast water in the ballast water tank of the prefabricated dry dock is discharged so that the prefabricated dry dock floats until the freeboard height of the prefabricated dry dock reaches a second designed freeboard height, and then the prefabricated dry dock is winched and moved using a traction winch, wherein the difference between the height of the prefabricated dry dock and the second designed freeboard height is less than the average water level in the dry dock foundation pit at high tide during the construction period.

[0025] In some of the embodiments, if the height of the prefabricated dry dock is less than or equal to the highest water level in the dry dock foundation trench at high tide, then after the prefabricated dry dock is sunk, it also includes: installing prefabricated blocks on the top of the prefabricated dry dock until the total height of the prefabricated dry dock and the prefabricated blocks is greater than the highest water level in the dry dock foundation trench at high tide, and water stopping is performed between the prefabricated blocks and the top of the prefabricated dry dock so that the prefabricated blocks and the prefabricated dry dock are connected as one.

[0026] In some of these embodiments, the prefabricated blocks are transported by a catamaran along with the prefabrication dry dock.

[0027] In some of the embodiments, the dock opening is closed by closing the dock door of the prefabricated dry dock; alternatively, a temporary sealing door is installed at the dock opening to close the dock opening, and after the prefabricated dry dock is sunk, the temporary sealing door is removed and the prefabricated dock door is installed.

[0028] In some of the embodiments, a plurality of first compartments are opened in the dock wall of the prefabricated dry dock, and the first compartments are extended from the inside of the dock wall to the top of the dock wall; the bottom plate of the prefabricated dry dock includes a bottom plate body and a cover plate, the bottom plate body is connected to the bottom of the dock wall, and a plurality of second compartments are opened in the part of the bottom plate body located within the encirclement of the dock wall, and the second compartments are extended from the inside of the bottom plate body to the top of the bottom plate body, and the cover plate is covered on the top of the part of the bottom plate body located within the encirclement of the dock wall; in the dry dock installation step, when the prefabricated dry dock is transported, the first compartments and the second compartments are both empty, and when the prefabricated dry dock is fixed to the dry dock foundation trench, stones are backfilled into the first compartments and the second compartments, and after backfilling, the cover plate is placed within the encirclement of the dock wall and covered on the bottom plate body to cover the through openings of the second compartments at the top of the bottom plate body and form a flat bottom surface of the dock.

[0029] In some of the embodiments, a flange is prefabricated on the bottom periphery of the prefabricated dry dock; in the dry dock installation step, the specific step of fixing the prefabricated dry dock to the dry dock base trench includes: filling the portion between the dry dock base trench and the prefabricated dry dock with stones to press the flange so that the prefabricated dry dock is fixed in the dry dock base trench.

[0030] In some of the embodiments, before filling with stones, the process also includes: stopping water between the entrance of the foundation trench and the outer wall of the prefabricated dry dock, draining the space between the dry dock foundation trench and the prefabricated dry dock, and filling with stones after drainage.

[0031] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0032] 1. The method for rapid transportation and installation of an integral prefabricated dry dock provided by the present invention only requires excavation of a dry dock foundation trench on an offshore island, and the prefabricated dry dock is transported integrally by a construction ship, and the prefabricated dry dock is placed in the dry dock foundation trench for installation, so that the dry dock construction can be completed quickly, thereby realizing rapid maintenance of ships and prefabrication of components in the prefabricated dry dock, and has good application prospects in offshore water conservancy project construction;

[0033] 2. The method for rapid transportation and installation of an integral prefabricated dry dock provided by the present invention can realize rapid transfer and reuse of the prefabricated dry dock, which is beneficial to saving construction costs and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 A flowchart of a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0036] Figure 2 A top view of a dry dock foundation trench obtained by construction on an offshore island in a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0037] Figure 3 For along Figure 2 Sectional view along line AA;

[0038] Figure 4 A schematic diagram of the process of constructing a block stone cushion layer and a crushed stone base bed in a dry dock foundation trench in a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0039] Figure 5 A top view of a prefabricated dry dock in a method for rapid transportation and installation of an integral prefabricated dry dock provided by an embodiment of the present invention;

[0040] Figure 6 A front view of a prefabricated dry dock in a method for rapid transportation and installation of an integral prefabricated dry dock provided by an embodiment of the present invention;

[0041] Figure 7A schematic diagram of the connection state between a construction vessel and a prefabricated dry dock in a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0042] Figure 8 A schematic diagram of a process of winching a prefabricated dry dock to a dry dock foundation trench and sinking the prefabricated dry dock in a neutral plane direction in a method for rapid transportation and installation of an integral prefabricated dry dock provided by an embodiment of the present invention;

[0043] Fig. 9 A schematic diagram of a process of winching a prefabricated dry dock to a dry dock foundation trench in a top-down direction in a method for rapid transportation and installation of an integral prefabricated dry dock provided by an embodiment of the present invention;

[0044] Fig.10 A schematic diagram of fixing a prefabricated dry dock to a dry dock foundation trench in the vertical direction of a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0045] Fig.11 A schematic diagram of fixing a prefabricated dry dock to a dry dock foundation trench in a top view in a method for rapid transportation and installation of an integral prefabricated dry dock provided by one embodiment of the present invention;

[0046] Fig.12 A schematic diagram of the process of transporting a prefabricated dry dock as a whole into a dry dock foundation trench, sinking it and installing prefabricated blocks in a method for rapid transportation and installation of an integral prefabricated dry dock provided by another embodiment of the present invention;

[0047] Fig.13 A top view of a prefabricated dry dock used in a method for rapid transportation and installation of an integral prefabricated dry dock provided in yet another embodiment of the present invention;

[0048] Fig.14 for Fig.13 A top view of the prefabricated dry dock without the cover;

[0049] Fig.15 For along Fig.13 Cross-sectional view along line BB.

[0050] In the figure:

[0051] 1. Offshore islands; 2. Cofferdam; 3. Dry dock foundation trench; 4. Riprap tamping ship; 5. Leveling ship; 6. Prefabricated dry dock; 7. Catamaran; 8. Towing winch; 9. First control winch; 10. Second control winch; 11. Twisting traction cable; 12. First twisting control cable; 13. Second twisting control cable; 14. Stone; 15. Waterstop wall; 16. Prefabricated blocks;

[0052] 31. Block stone cushion; 32. Gravel base bed;

[0053] 61. Dock door; 62. Ballast water tank; 63. Lifting point; 64. First mooring post; 65. Second mooring post; 66. Third mooring post; 67. Flange; 68. Dock wall; 681. First compartment; 69. Bottom plate; 691. Bottom plate body; 6911. Second compartment; 692. Cover plate;

[0054] 71. Sheet body; 72. Connecting bridge. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0056] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] As attached Figure 1 As shown, an exemplary embodiment of the present invention provides a method for rapid transportation and installation of an integral prefabricated dry dock, comprising the following steps:

[0059] S1 Dry dock foundation trench construction: select a site at the edge of the offshore island 1 as the preset position of the dry dock, and construct a dry dock foundation trench 3 with a bottom surface that meets the preset elevation requirements at the preset position of the dry dock. The side of the dry dock foundation trench 3 close to the offshore is open to form a foundation trench entrance connected to the offshore;

[0060] S2 Dry dock installation: Use the construction vessel to transport the prefabricated dry dock 6 as a whole, place the prefabricated dry dock 6 in the dry dock foundation trench 3, and fix it to the dry dock foundation trench 3; before transporting the prefabricated dry dock 6, close the dock opening of the prefabricated dry dock 6; when placing the prefabricated dry dock 6 in the dry dock foundation trench 3, make the dock opening of the prefabricated dry dock 6 and the entrance of the foundation trench in the same direction.

[0061] The above-mentioned integral prefabricated dry dock rapid transportation and installation construction method only needs to dig the dry dock foundation trench 3 on the offshore island 1, use the construction ship to transport the prefabricated dry dock 6 as a whole, and place the prefabricated dry dock 6 in the dry dock foundation trench 3 for installation, which can quickly complete the dry dock construction, thereby realizing rapid maintenance of ships and prefabrication of components in the prefabricated dry dock 6, and has good application prospects in offshore water conservancy project construction. Moreover, the above-mentioned integral prefabricated dry dock rapid transportation and installation construction method can realize the rapid transfer and reuse of the prefabricated dry dock 6, which is conducive to saving construction costs and has good economic benefits.

[0062] Regarding the S1 dry dock foundation trench construction steps, in some embodiments, Figure 2 and Figure 3 As shown, when the offshore island 1 is an artificial island, since the offshore artificial island is usually formed by filling construction, in order to save the construction workload of the dry dock foundation trench 3, in the construction step of the dry dock foundation trench 3, after the artificial island is filled to a preset elevation, a cofferdam 2 is set at a preset position of the dry dock to enclose the dry dock foundation trench 3, and the part outside the cofferdam 2 continues to be filled to form an artificial island, so as to reserve a dry dock foundation trench 3 on the completed artificial island.

[0063] It is understandable that the dry dock foundation trench 3 can also be formed by excavating on the offshore island 1. The specific construction steps include: excavating a foundation pit at a preset position of the dry dock, and constructing a supporting slope while excavating until the excavation reaches a preset elevation to form the dry dock foundation trench 3. It should be noted that the excavation of the foundation pit can be carried out by a grab dredger; the supporting slope construction can adopt conventional supporting slope construction technology in the field, as long as the slope stability of the dry dock foundation trench 3 can be ensured.

[0064] In order to ensure that the bottom surface of the dry dock foundation trough 3 has sufficient bearing capacity to support the prefabricated dry dock 6, Figure 4As shown, in the S1 dry dock foundation trench construction step, after the dry dock foundation trench 3 is formed, the step further includes: throwing and filling stones at the bottom of the dry dock foundation trench 3 and tamping them to form a stone cushion layer 31, laying and tamping gravel on the stone cushion layer 31 to form a gravel base bed 32; in the dry dock installation step, the prefabricated dry dock 6 is placed on the gravel base bed 32. It should be noted that the stone throwing and tamping construction uses the stone throwing and tamping ship 4 used for the construction of the immersed tube tunnel base bed (for example, the synchronous stone throwing and tamping ship disclosed in patent CN212772372U), and the construction steps of the stone cushion layer 31 are: the stone throwing and tamping ship 4 enters the dry dock foundation trench 3, and gradually performs stone throwing and tamping construction from the end of the dry dock foundation trench 3 away from the foundation trench entrance to the foundation trench entrance. The stone throwing and tamping construction is carried out using the stone throwing and tamping ship 4 used for the construction of the immersed tube tunnel base bed, and its construction efficiency is high. It should also be noted that the gravel laying and leveling construction uses the leveling ship 5 used for the construction of the immersed tube tunnel foundation bed (such as the leveling ship disclosed in patents CN203846501U, CN207260218U, etc.), and the construction steps of the gravel foundation bed 32 are: the leveling ship 5 enters the dry dock foundation trench 3, and gradually performs gravel laying and leveling construction from the end of the dry dock foundation trench 3 away from the foundation trench entrance toward the foundation trench entrance. The gravel laying and leveling construction using the leveling ship 5 used for the construction of the immersed tube tunnel foundation bed has high leveling efficiency and high precision.

[0065] It should also be noted that in order to ensure that ships can enter and exit the prefabricated dry dock 6 normally after construction, the preset elevation is determined based on the difference between the lowest tide level at low tide at the offshore island 1 and the lowest water level required for ships to enter and exit the prefabricated dry dock 6.

[0066] Regarding the S2 dry dock installation steps, in this embodiment, Figure 5 and Figure 6 As shown, a ballast water tank 62 is provided in the prefabricated dry dock 6 to adjust the freeboard of the prefabricated dry dock 6 in a floating state, so as to facilitate the transportation and installation of the prefabricated dry dock 6; a hanging point 63 is provided on the top of the prefabricated dry dock 6 to facilitate the connection with the construction vessel; Figure 7 As shown, the construction vessel is a catamaran 7, and the space below the connecting bridge 72 of the catamaran 7 and between the two sheets 71 is a cargo space; Figure 8 and Fig. 9 As shown, the specific steps of transporting the prefabricated dry dock 6 by using a construction vessel and placing the prefabricated dry dock 6 in the dry dock foundation trench 3 are as follows:

[0067] S21 Dock-ship connection: make the prefabricated dry dock 6 float on the water, sail the catamaran 7 above the prefabricated dry dock 6 and place the prefabricated dry dock 6 in the cargo space of the catamaran 7, connect the lifting point 63 of the prefabricated dry dock 6 to the catamaran 7, and keep the relative positions of the prefabricated dry dock 6 and the catamaran 7 fixed; in this step, it should be noted that before the catamaran 7 sails toward the prefabricated dry dock 6, it is necessary to ensure that there is a certain distance between the top surface of the prefabricated dry dock 6 and the bottom surface of the connecting bridge 72 of the catamaran 7 in the vertical direction to avoid collision between the catamaran 7 and the prefabricated dry dock 6; when connecting the prefabricated dry dock 6 to the catamaran 7, tighten the connection between the prefabricated dry dock 6 and the catamaran 7 to keep the relative positions of the prefabricated dry dock 6 and the catamaran 7 fixed.

[0068] S22 transport and sinking: use the catamaran 7 to transport the prefabricated dry dock 6 to the entrance of the foundation trench, winch the prefabricated dry dock 6 into the dry dock foundation trench 3 through the entrance of the foundation trench, and inject ballast water into the ballast water tank 62 of the prefabricated dry dock 6 so that the prefabricated dry dock 6 can rest on the bottom of the dry dock foundation trench 3.

[0069] In this embodiment, the prefabricated dry dock 6 is transported by a catamaran 7 straddling the prefabricated dry dock 6, without the assistance of a tugboat, and the transportation efficiency is high. Moreover, the catamaran 7 transports the prefabricated dry dock 6 to a position close to the entrance of the foundation trench, and the prefabricated dry dock 6 is moved into the dry dock foundation trench 3 by winching, which can avoid the collision between the catamaran 7 and the dry dock foundation trench 3, which is conducive to reducing construction risks and ensuring construction safety.

[0070] Preferably, the catamaran 7 can be a self-propelled submerged tube transport and installation integrated ship for transporting and sinking submerged tubes, and the width of the prefabricated dry dock 6 is less than the distance between the two sheets 71 of the self-propelled submerged tube transport and installation integrated ship, so as to achieve the reuse of the self-propelled submerged tube transport and installation integrated ship, without the need for specially customized ships, which is conducive to reducing construction costs. It should be noted that, for example, the self-propelled submerged tube transport and installation integrated ship disclosed in patent CN106516021B can be used, and the prefabricated dry dock 6 can be connected by a pulling and lifting device set on the ship.

[0071] It should be noted that, in this embodiment, before transporting the prefabricated dry dock 6, the dock door 61 of the prefabricated dry dock 6 is closed to seal the dock opening. It is understandable that, in order to reduce the transportation weight of the prefabricated dry dock 6 and facilitate the rapid transfer of the prefabricated dry dock 6, a temporary sealing door (such as a steel plate) can also be installed at the dock opening to seal the dock opening. After the prefabricated dry dock 6 is sunk, the temporary sealing door is removed and the prefabricated dock door 61 is installed. The prefabricated dock door 61 can be transported together with the prefabricated dry dock 6 by the catamaran 7, or can be prefabricated on site.

[0072] It should also be noted that the top of the prefabricated dry dock 6 is open, and before transporting the prefabricated dry dock 6, the top opening of the prefabricated dry dock 6 needs to be sealed to prevent a large amount of water from entering the prefabricated dry dock 6 from the top opening of the prefabricated dry dock 6 during transportation, thereby affecting the stability of the ship during transportation. For example, the top opening of the prefabricated dry dock 6 can be sealed by welding steel plates, custom-made sealing covers, etc., as long as most of the water can be prevented from entering the prefabricated dry dock 6.

[0073] In order to safely and quickly move the prefabricated dry dock 6 into the dry dock foundation groove 3, Figure 5 As shown, a first mooring post 64 is provided at the center of the top of the prefabricated dry dock 6 away from the dock entrance, and second mooring posts 65 are provided near two corners, respectively. A third mooring post 66 is provided near two corners of the top of the prefabricated dry dock 6 near the dock entrance, respectively, so as to facilitate mooring the prefabricated dry dock 6; Figure 8 and Fig. 9 As shown, with the side of the dry dock foundation groove 3 provided with the foundation groove entrance as the front, before the prefabricated dry dock 6 is winched, a traction winch 8 and at least two first control winches 9 are arranged on the offshore island 1 near the rear side of the dry dock foundation groove 3, the traction winch 8 is located on the center line of the dry dock foundation groove 3, and the two first control winches 9 are respectively located on the left and right sides of the traction winch 8 and near the left and right sides of the dry dock foundation groove 3; the catamaran 7 is respectively provided with second control winches 10 near the two sheets 71; in the S22 transportation and sinking step, the specific steps of winching the prefabricated dry dock 6 into the dry dock foundation groove 3 include:

[0074] S221. After the catamaran 7 transports the prefabricated dry dock 6 to the entrance of the foundation trench, the prefabricated dry dock 6 is temporarily moored and fixed, the connection between the prefabricated dry dock 6 and the catamaran 7 is disconnected, and the catamaran 7 is moved to the side away from the dry dock foundation trench 3, so that the prefabricated dry dock 6 is located between the catamaran 7 and the entrance of the foundation trench of the dry dock foundation trench 3, and the catamaran 7 is moored and stationed; in this step, it should be noted that when disconnecting the connection between the prefabricated dry dock 6 and the catamaran 7, the connection between the prefabricated dry dock 6 and the catamaran 7 is first loosened to make the prefabricated dry dock 6 sink slightly, so that the top surface of the prefabricated dry dock 6 is separated from the bottom surface of the connecting bridge 72 of the catamaran 7, so as to avoid collision or friction with the top surface of the prefabricated dry dock 6 when the catamaran 7 moves.

[0075] S222, connecting the twisting and shifting traction cable 11 between the first mooring post 64 of the prefabricated dry dock 6 and the traction winch 8, connecting the first twisting and shifting control cables 12 between the two second mooring posts 65 and the two corresponding first control winches 9 on the offshore island 1, and connecting the second twisting and shifting control cables 13 between the two second mooring posts 65 and the two corresponding second control winches 10 on the catamaran 7;

[0076] S223, the traction winch 8 reels in the twisting and moving traction cable 11, and at the same time, the first control winch 9 reels in the first twisting and moving control cable 12, and the second control winch 10 releases the second twisting and moving control cable 13, so as to twist and move the prefabricated dry dock 6 into the dry dock foundation groove 3; during the twisting and moving process, the moving direction of the prefabricated dry dock 6 is controlled by controlling the speed of the two first control winches 9 for winding up the first twisting and moving control cables 12 and the speed of the two second control winches 10 for releasing the second twisting and moving control cables 13.

[0077] In the above embodiment, after the prefabricated dry dock 6 is temporarily moored and fixed, the catamaran 7 is moved to the side away from the dry dock foundation groove 3, so that the prefabricated dry dock 6 stays at a position between the catamaran 7 and the foundation groove entrance of the dry dock foundation groove 3, and then, by tying the first mooring bit 64 and the second mooring bit 65 on the side of the prefabricated dry dock 6 close to the dry dock foundation groove 3 to the traction winch 8 and the first control winch 9 provided on the offshore island 1 respectively, and tying the third mooring bit 66 on the side of the prefabricated dry dock 6 close to the catamaran 7 to the second control winch 10 on the catamaran 7, the offshore island 1 and the moored catamaran 7 provide fixed points for the mooring of the prefabricated dry dock 6, and the prefabricated dry dock 6 is accurately moved into the dry dock foundation groove 3 by the control of the traction winch 8, the first control winch 9 and the second control winch 10. The above method of mooring the prefabricated dry dock 6 into the dry dock foundation groove 3 can safely and quickly move the prefabricated dry dock 6 into the dry dock foundation groove 3, and the construction is convenient.

[0078] It should be noted that in order to further improve the construction safety when the prefabricated dry dock 6 is moved into the dry dock foundation trench 3, especially when the height of the prefabricated dry dock 6 is greater than or equal to the highest water level in the dry dock foundation trench 3 at high tide, in order to prevent the prefabricated dry dock 6 from colliding with the dry dock foundation trench 3, as shown in FIG. Figure 8 and Fig. 9As shown, in this embodiment, in the dock-ship connection step S21, ballast water is injected into the ballast water tank 62 of the floating prefabricated dry dock 6 to make the prefabricated dry dock 6 sink until the freeboard height of the prefabricated dry dock 6 reaches the first designed freeboard height, and then the prefabricated dry dock 6 is connected to the catamaran 7, wherein the first designed freeboard height is less than the vertical distance between the bottom surface of the connecting bridge 72 and the water surface when the catamaran 7 floats on the water surface; in the transportation and sinking step S22, when the prefabricated dry dock 6 is located between the catamaran 7 and the entrance of the foundation pit, the ballast water in the ballast water tank 62 of the prefabricated dry dock 6 is discharged to make the prefabricated dry dock 6 float until the freeboard height of the prefabricated dry dock 6 reaches the second designed freeboard height, and then the prefabricated dry dock 6 is winched by the traction winch 8, wherein the second designed freeboard height is greater than the first designed freeboard height, and the difference between the height of the prefabricated dry dock 6 and the second designed freeboard height is less than the average water level in the dry dock foundation pit 3 at high tide during the construction period. In this embodiment, the prefabricated dry dock 6 is firstly sunk by ballasting, so as to control the freeboard height of the prefabricated dry dock 6 to the first designed freeboard height, so as to facilitate the catamaran 7 to straddle the prefabricated dry dock 6, and to reserve floating space for the subsequent prefabricated dry dock 6 to be moved into the dry dock foundation trench 3; after the prefabricated dry dock 6 is transported to the right place, the freeboard height of the prefabricated dry dock 6 is controlled to the second designed freeboard height by discharging ballast water, so as to reserve a certain safety distance between the bottom of the prefabricated dry dock 6 and the bottom surface of the dry dock foundation trench 3, so as to avoid the prefabricated dry dock 6 from hitting the bottom surface of the dry dock foundation trench 3 when it is moved, thereby causing an accident.

[0079] Regarding the S2 dry dock installation steps, it should be noted that in order to facilitate the fixing of the prefabricated dry dock 6 in the dry dock base groove 3, as shown in FIG. Figure 5 and Figure 6 As shown, in this embodiment, the bottom periphery of the prefabricated dry dock 6 is prefabricated with a flange 67; Fig.10 and Fig.11 As shown, the specific steps of fixing the prefabricated dry dock 6 to the dry dock foundation trench 3 include: filling the portion between the dry dock foundation trench 3 and the prefabricated dry dock 6 with stones 14 to press the flange 67, so that the prefabricated dry dock 6 is fixed in the dry dock foundation trench 3. The prefabricated dry dock 6 is fixed in the dry dock foundation trench 3 in the above manner. When the prefabricated dry dock 6 is used and needs to be dismantled, the stones 14 filled between the dry dock foundation trench 3 and the prefabricated dry dock 6 are removed, and the ballast water in the ballast water tank 62 of the prefabricated dry dock 6 is discharged, so that the prefabricated dry dock 6 can float up to leave the dry dock foundation trench 3, so that the prefabricated dry dock 6 can be recycled and reused.

[0080] In order to prevent water from impacting the stones 14 filled between the dry dock foundation trench 3 and the prefabricated dry dock 6 and affecting the firmness of the prefabricated dry dock 6, in this embodiment, before filling the stones 14, the following steps are further performed: stopping water between the foundation trench entrance and the outer wall of the prefabricated dry dock 6, draining the space between the dry dock foundation trench 3 and the prefabricated dry dock 6, and filling the stones 14 after draining. It should be noted that, if Fig.11As shown, in this embodiment, a water stop wall 15 is cast between the foundation trench entrance and the outer wall of the dock wall of the prefabricated dry dock 6, thereby achieving water stopping between the foundation trench entrance and the outer wall of the dock wall of the prefabricated dry dock 6. It is understandable that those skilled in the art can also use other methods to stop water between the foundation trench entrance and the outer wall of the dock wall of the prefabricated dry dock 6.

[0081] like Fig.12 As shown, in another exemplary embodiment of the present invention, when the width of the dry dock foundation trough 3 is much larger than the width of the catamaran 7, that is, when the catamaran 7 can safely enter the dry dock foundation trough 3, when the dry dock is transported and sunk, the prefabricated dry dock 6 is transported as a whole into the dry dock foundation trough 3 by the catamaran 7, ballast water is injected into the ballast water tank 62 of the prefabricated dry dock 6, and the prefabricated dry dock 6 is sunk by the catamaran 7, so that the prefabricated dry dock 6 is seated on the bottom in the dry dock foundation trough 3. By transporting the prefabricated dry dock 6 as a whole into the dry dock foundation trough 3 by the catamaran 7, the prefabricated dry dock 6 can be transported to the place in one step without winching, thereby simplifying the construction steps; moreover, the prefabricated dry dock 6 can be controlled by the catamaran 7 to be sunk into place quickly and vertically.

[0082] like Fig.12 As shown, due to the height limit of the catamaran 7 connecting bridge 72 from the water surface, and considering the transportation safety of the prefabricated dry dock 6, the height of the transported prefabricated dry dock 6 should not be designed too high. When the height of the prefabricated dry dock 6 is less than or equal to the highest water level in the dry dock foundation groove 3 at high tide, after the prefabricated dry dock 6 is sunk, it also includes: installing a prefabricated block 16 on the top of the prefabricated dry dock 6 until the total height of the prefabricated dry dock 6 and the prefabricated block 16 is greater than the highest water level in the dry dock foundation groove 3 at high tide, and stopping the water between the prefabricated block 16 and the top of the prefabricated dry dock 6, so that the prefabricated block 16 and the prefabricated dry dock 6 are connected as one. In this embodiment, the height of the prefabricated dry dock 6 is increased by installing a prefabricated block 16, so as to meet the use requirements of the dry dock. It should be noted that the water stop between the prefabricated block 16 and the top of the prefabricated dry dock 6 can adopt a water stop belt, such as a grouting type water stop belt.

[0083] In order to reduce transportation costs, Fig.12 As shown, in this embodiment, the prefabricated block 16 is transported by the catamaran 7 together with the prefabricated dry dock 6. It should be noted that the prefabricated block 16 can be placed on the deck of the catamaran 7 or above the connecting bridge 72 for transportation.

[0084] like Figure 13-Figure 15As shown, in another exemplary embodiment of the present invention, a plurality of first compartments 681 are provided in the dock wall 68 of the prefabricated dry dock 6, and the first compartments 681 are extended from the inside of the dock wall 68 to the top of the dock wall 68; the bottom plate 69 of the prefabricated dry dock 6 includes a bottom plate body 691 and a cover plate 692, the bottom plate body 691 is connected to the bottom of the dock wall 68, and a plurality of second compartments 6911 are provided in the portion of the bottom plate body 691 located within the range surrounded by the dock wall 68, and the second compartments 6911 are extended from the inside of the bottom plate body 691 to the top of the bottom plate body 691, and the cover plate 692 is provided. The plate 692 is covered on the top of the portion of the bottom plate body 691 that is located within the encirclement of the dock wall 68; in the dry dock installation step, when the prefabricated dry dock 6 is transported, the first compartment 681 and the second compartment 6911 are both empty. When the prefabricated dry dock 6 is fixed to the dry dock base trench 3, stones are backfilled into the first compartment 681 and the second compartment 6911. After backfilling, the cover plate 692 is placed within the encirclement of the dock wall 68 and covered on the bottom plate body 691 to cover the through opening of the second compartment 6911 at the top of the bottom plate body 691 and form a flat bottom surface inside the dock. In this embodiment, by arranging the first compartment 681 and the second compartment 6911 in the dock wall 68 and the bottom plate 69 of the prefabricated dry dock 6, when the prefabricated dry dock 6 is transported, the first compartment 681 and the second compartment 6911 are left empty, so that the transportation weight of the prefabricated dry dock 6 can be reduced. After the prefabricated dry dock 6 is placed on the dry dock foundation groove 3, the prefabricated dry dock 6 can be transformed into a gravity structure by backfilling stones into the first compartment 681 and the second compartment 6911 to ensure stable bottoming. It should be noted that the top of the part of the bottom plate body 691 where the second compartment 691 is opened is provided with a groove to accommodate the cover plate 692. After the cover plate 692 is covered, the top of the cover plate 692 is flush with the top surface of the surrounding bottom plate body 691.

[0085] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for rapid transportation and installation of an integral prefabricated dry dock, characterized in that: The steps include: Construction of dry dock foundation trench: select a site at the edge of an offshore island as the preset position of the dry dock, and construct a dry dock foundation trench with a bottom surface that meets the preset elevation requirements at the preset position of the dry dock. The side of the dry dock foundation trench close to the offshore is open to form a foundation trench entrance connected to the offshore; Dry dock installation: The prefabricated dry dock is transported as a whole by a construction vessel, and the prefabricated dry dock is placed in the dry dock foundation groove and fixed to the dry dock foundation groove; wherein, before transporting the prefabricated dry dock, the dock opening of the prefabricated dry dock is closed; when the prefabricated dry dock is placed in the dry dock foundation groove, the dock opening of the prefabricated dry dock and the entrance of the foundation groove are located in the same direction; In the dry dock foundation pit construction step, the step of forming the dry dock foundation pit is: excavating a foundation pit at a preset position of the dry dock, and constructing a supporting slope while excavating until the excavation reaches the preset elevation to form the dry dock foundation pit; or, when the offshore island is an artificial island, after the artificial island is filled to the preset elevation, a cofferdam is set at the preset position of the dry dock to enclose the dry dock foundation pit, and the part outside the cofferdam is continuously filled to form the artificial island, so as to reserve the dry dock foundation pit on the completed artificial island; The step of constructing the dry dock foundation trench, after the dry dock foundation trench is formed, further comprises: filling the bottom of the dry dock foundation trench with blocks of stone and tamping it to form a block stone cushion layer, and laying and leveling crushed stone on the block stone cushion layer to form a crushed stone bed; in the step of installing the dry dock, the prefabricated dry dock is placed on the crushed stone bed; A ballast water tank is provided in the prefabricated dry dock, and a lifting point is provided on the top of the prefabricated dry dock; the construction vessel is a catamaran, and the space below the connecting bridge of the catamaran and between the two hulls is a cargo space; In the dry dock installation step, the specific steps of using the construction vessel to transport the prefabricated dry dock and placing the prefabricated dry dock in the dry dock foundation trench are: Dock-ship connection: the prefabricated dry dock is floated on the water, the catamaran travels above the prefabricated dry dock and places the prefabricated dry dock in the cargo space of the catamaran, the hanging point of the prefabricated dry dock is connected to the catamaran, and the relative positions of the prefabricated dry dock and the catamaran are kept fixed; Transport and sinking: using the catamaran to transport the prefabricated dry dock to the entrance of the foundation trench, winching the prefabricated dry dock into the dry dock foundation trench through the entrance of the foundation trench, injecting ballast water into the ballast water tank of the prefabricated dry dock, so that the prefabricated dry dock can rest on the bottom of the dry dock foundation trench; or using the catamaran to transport the prefabricated dry dock as a whole into the dry dock foundation trench, injecting ballast water into the ballast water tank of the prefabricated dry dock, and sinking the prefabricated dry dock using the catamaran, so that the prefabricated dry dock can rest on the bottom of the dry dock foundation trench; The prefabricated dry dock is provided with a first mooring post at the center of the top of the side away from the dock entrance, and second mooring posts are respectively provided near the two corners, and third mooring posts are respectively provided near the two corners of the top of the side close to the dock entrance of the prefabricated dry dock; with the side of the dry dock base trough provided with the base trough entrance as the front, before the prefabricated dry dock is winched, a traction winch and at least two first control winches are provided on the offshore island near the rear side of the dry dock base trough, the traction winch is located on the center line of the dry dock base trough, and the two first control winches are respectively located on the left and right sides of the traction winch and near the left and right sides of the dry dock base trough; the catamaran is provided with second control winches near the two hulls; In the transporting and sinking step, the specific steps of winching the prefabricated dry dock into the dry dock foundation trench include: After the catamaran transports the prefabricated dry dock to the entrance of the base trench, the prefabricated dry dock is temporarily moored to the prefabricated dry dock, the connection between the prefabricated dry dock and the catamaran is disconnected, and the catamaran is moved to the side away from the dry dock base trench so that the prefabricated dry dock is located between the catamaran and the entrance of the dry dock base trench, and the catamaran is moored to a stationary position; A twisting and shifting traction cable is connected between the first mooring post of the prefabricated dry dock and the traction winch, a first twisting and shifting control cable is respectively connected between the two second mooring posts and the two first control winches corresponding to the offshore island, and a second twisting and shifting control cable is respectively connected between the two second mooring posts and the two second control winches corresponding to the catamaran; The traction winch reels in the twisting and moving traction cable, and at the same time, the first control winch reels in the first twisting and moving control cable and the second control winch releases the second twisting and moving control cable, so as to twist and move the prefabricated dry dock into the dry dock foundation groove; during the twisting and moving process, the moving direction of the prefabricated dry dock is controlled by controlling the speed of the two first control winches reeling in the first twisting and moving control cables and the speed of the two second control winches releasing the second twisting and moving control cables; A plurality of first compartments are provided in the dock wall of the prefabricated dry dock, and the first compartments are extended from the inside of the dock wall to the top of the dock wall; the bottom plate of the prefabricated dry dock comprises a bottom plate body and a cover plate, the bottom plate body is connected to the bottom of the dock wall, a plurality of second compartments are provided in the portion of the bottom plate body located within the encirclement of the dock wall, the second compartments are extended from the inside of the bottom plate body to the top of the bottom plate body, and the cover plate is provided on the top of the portion of the bottom plate body located within the encirclement of the dock wall; in the dry dock installation step, when the prefabricated dry dock is transported, the first compartments and the second compartments are both in an empty state, and when the prefabricated dry dock is fixed to the dry dock foundation trench, stones are backfilled into the first compartments and the second compartments, and after backfilling, the cover plate is placed within the encirclement of the dock wall and covers the bottom plate body to cover the through opening of the second compartment at the top of the bottom plate body and form a flat bottom surface of the dock.

2. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: The construction steps of the block stone cushion layer are as follows: a stone dumping and tamping ship sails into the dry dock foundation pit, and gradually performs block stone dumping and tamping construction from one end of the dry dock foundation pit away from the foundation pit entrance toward the foundation pit entrance; the construction steps of the crushed stone base bed are as follows: a leveling ship sails into the dry dock foundation pit, and gradually performs crushed stone laying and leveling construction from one end of the dry dock foundation pit away from the foundation pit entrance toward the foundation pit entrance.

3. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: The preset elevation is determined according to the difference between the lowest tide level at the offshore island during low tide and the lowest water level required for ships to enter and exit the prefabricated dry dock.

4. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: The catamaran is a self-propelled integrated ship for transporting and sinking submerged tubes, and the width of the prefabricated dry dock is smaller than the distance between the two hulls of the self-propelled integrated ship for transporting and sinking submerged tubes.

5. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: The top of the prefabricated dry dock is open, and before the prefabricated dry dock is transported, the top opening of the prefabricated dry dock is closed.

6. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: In the dock-ship connection step, ballast water is injected into the ballast water tank of the floating prefabricated dry dock so that the prefabricated dry dock sinks until the freeboard height of the prefabricated dry dock reaches a first designed freeboard height, and then the prefabricated dry dock is connected to the catamaran, wherein the first designed freeboard height is less than the vertical distance between the bottom surface of the connecting bridge and the water surface when the catamaran floats on the water surface; in the transportation and sinking step, when the prefabricated dry dock is located between the catamaran and the entrance of the foundation pit, the ballast water in the ballast water tank of the prefabricated dry dock is discharged so that the prefabricated dry dock floats until the freeboard height of the prefabricated dry dock reaches a second designed freeboard height, and then the prefabricated dry dock is winched by the traction winch, wherein the difference between the height of the prefabricated dry dock and the second designed freeboard height is less than the average water level in the dry dock foundation pit at high tide during the construction period.

7. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: If the height of the prefabricated dry dock is less than or equal to the highest water level in the dry dock foundation trench at high tide, then after the prefabricated dry dock is sunk, the method further includes: installing prefabricated blocks on the top of the prefabricated dry dock until the total height of the prefabricated dry dock and the prefabricated blocks is greater than the highest water level in the dry dock foundation trench at high tide, and water stopping is performed between the prefabricated blocks and the top of the prefabricated dry dock so that the prefabricated blocks are connected to the prefabricated dry dock as a whole.

8. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 7 is characterized in that: The prefabricated blocks are transported together with the prefabricated dry dock by the catamaran.

9. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1 is characterized in that: The dock opening is closed by closing the dock door of the prefabricated dry dock; or, a temporary sealing door is installed at the dock opening to close the dock opening, and after the prefabricated dry dock is sunk, the temporary sealing door is removed and a prefabricated dock door is installed.

10. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 1, characterized in that: The bottom periphery of the prefabricated dry dock is prefabricated with a flange; in the dry dock installation step, the specific step of fixing the prefabricated dry dock to the dry dock base trench includes: filling the portion between the dry dock base trench and the prefabricated dry dock with stones to press the flange so that the prefabricated dry dock is fixed in the dry dock base trench.

11. The method for rapid transportation and installation of an integral prefabricated dry dock according to claim 10, characterized in that: Before filling the stones, the method further includes: stopping water between the entrance of the foundation trench and the outer wall of the prefabricated dry dock, draining the space between the dry dock foundation trench and the prefabricated dry dock, and filling the stones after draining.

Images