Methods for dismantling split-type casing structures and their application in deep-water construction.

Abstract

This invention relates to a method for dismantling a split-type casing structure and its application in deep-water construction, belonging to the field of engineering construction technology. The method includes the following steps: vertically lifting the removable casing from the permanent casing using a construction vessel; moving the removable casing horizontally a distance using the construction vessel to prevent collision between the removable casing and the concrete pile formed by the split-type casing structure; rotating the removable casing upwards in a vertical plane with its connection point to the construction vessel as the center until it floats on the water surface; and separating the first steel wire rope connecting the removable and permanent casings from both. This method, by designing the casing structure as a split structure comprising a permanent and a removable casing, facilitates the recycling of the removable casing after construction, thereby reducing construction costs.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering construction, and particularly relates to a method for disassembling a split-type casing structure and application of the method in deep water construction. BACKGROUND

[0002] A bored pile is a common way for deep water pile foundation construction. First, a casing is deeply inserted into water and vertically extended into the soil layer at the bottom of the water, then concrete is poured inside the casing, and after the pouring of the concrete is completed, the casing is disassembled. The traditional casing disassembly method usually adopts a cutting method at the middle of the casing. This method occupies the casing for a long time, consumes high cost, and the casing cannot be reused, resulting in waste of resources. In patent CN111926808A, a deep water pile foundation dismountable casing structure and a construction method thereof are disclosed. The casing structure is designed as a steel casing and a sleeve. The sleeve is inserted into the soil layer at the bottom of the water. After the pouring of the concrete is completed, the steel casing is separated from the sleeve to realize the reuse of the steel casing. Although the above dismountable casing effectively solves the problem of the non-reuse of the casing, in the prior art, the casing in the deep water pile foundation construction is lifted by double cranes and then turned over, or a single crane is used in cooperation with a pile turning device or a pile erecting trolley to erect the pile. The installation process of the casing is relatively complicated, which leads to the fact that the above dismountable casing also needs to be cooperated with double cranes or a crane in cooperation with a pile turning device or a pile erecting trolley during disassembly. The complicated disassembly construction of the casing undoubtedly increases the cost of the deep water pile foundation construction, and also increases the construction period.

[0003] Therefore, it is of great significance to design a method for dismounting a casing from deep water for deep water bored pile construction. SUMMARY

[0004] In view of the deficiencies in the related art, the present application provides a method for dismounting a split-type casing structure and application of the method in deep water construction. The casing structure is designed as a split-type structure including a dismountable casing and a permanent casing, so as to facilitate the recycling of the dismountable casing.

[0005] The present application provides a method for dismounting a split-type casing structure. The split-type casing structure includes a dismountable casing and a permanent casing. The dismountable casing and the permanent casing are detachably connected. The dismountable casing is connected to a construction ship, and the permanent casing is inserted into the soil layer at the bottom of the water. The method for dismounting the split-type casing structure includes the following steps:

[0006] Dismounting the dismountable casing from the permanent casing: the dismountable casing is vertically pulled up by the construction ship to separate the dismountable casing from the permanent casing;

[0007] Moving the dismountable casing away from the concrete pile: the construction ship drives the dismountable casing to move horizontally by a distance to prevent the dismountable casing from colliding with the concrete pile formed by the split-type casing structure.

[0008] Rotate the removable casing upwards: Rotate the removable casing upwards in a vertical plane with its connection point with the construction vessel as the center until the removable casing floats on the water surface;

[0009] Release the first wire rope from the removable casing and the permanent casing: separate the first wire rope used to connect the removable casing and the permanent casing from the removable casing and the permanent casing.

[0010] This technical solution designs the split casing structure as a separate structure including a removable casing and a permanent casing, so as to facilitate the recycling of the removable casing; the removable casing is separated from the permanent casing by the tension of the underwater soil layer when the construction vessel lifts the removable casing vertically upward; the removable casing is made to float on the water surface by rotating upward in the vertical plane under the action of buoyancy, thus facilitating the recovery of the removable casing.

[0011] In some embodiments, the removable casing rotates in a vertical plane under the influence of buoyancy and gravity, and the buoyancy and / or gravity acting on the removable casing is adjusted by regulating the amount of water entering it.

[0012] In some embodiments, during the upward rotation step of the removable casing, the buoyancy force on the removable casing is greater than its weight.

[0013] In some embodiments, the permanent casing is provided with a first lifting lug, the removable casing is provided with a second lifting lug and a third lifting lug, one end of the first wire rope is connected to a first winch installed on the construction vessel, and the other end of the first wire rope passes through the first and second lifting lugs and is then bound to the third lifting lug.

[0014] In some embodiments, during the disassembly of the removable casing and the permanent casing, a first winch releases a first wire rope to flexibly connect the removable casing and the permanent casing via the first wire rope, thereby tailing the removable casing.

[0015] This technical solution involves flexibly connecting a removable casing and a permanent casing via a first steel wire rope, so that the first steel wire rope can guide the removable casing as it rotates upwards.

[0016] In some embodiments, the second lifting lug is located at the end of the removable casing closer to the permanent casing, and the third lifting lug is located at the end of the removable casing further away from the permanent casing.

[0017] In some embodiments, in the step of releasing the flexible connection between the first wire rope and the removable casing and the permanent casing, the binding of the first wire rope to the third lifting lug is released, and the first winch winds up the first wire rope so that the first wire rope is detached from the first lifting lug and the second lifting lug, thereby completely separating the removable casing and the permanent casing.

[0018] In some embodiments, the removable casing and the permanent casing are arranged coaxially, and the removable casing is provided with a casing connection portion, which is detachably sleeved with the permanent casing.

[0019] In addition, the present invention also provides a method for constructing deep-water bored piles, comprising the following steps:

[0020] Piling: Transporting the split-type casing structure to the construction site using construction vessels;

[0021] Erecting piles: Vertically placing the split-type casing structure in the water;

[0022] Piling: A permanent casing is inserted vertically into the underwater soil layer using an impact hammer installed on a construction vessel;

[0023] Concrete pouring: Concrete is poured into the split casing structure to form concrete piles;

[0024] Removal of removable casing: The removable casing is separated from the permanent casing using the split casing structure removal method as described in any one of claims 1-8, and the removable casing is recycled.

[0025] In some embodiments, during the piling step, the first wire rope is wound up by a first winch to bind the removable casing to the permanent casing.

[0026] This technical solution designs the casing structure as a split type, using a permanent casing inserted into the underwater soil layer and a removable casing connected to the construction vessel to facilitate the insertion of the permanent casing into the underwater soil layer; the removable casing and permanent casing are detachably connected, and after construction is completed, the removable casing and permanent casing can be separated to achieve the recycling of the removable casing and reduce construction costs.

[0027] In some embodiments, the permanent casing is provided with a first lifting lug located at the end of the permanent casing away from the underwater soil layer; the removable casing is provided with a second lifting lug and a third lifting lug, the second lifting lug being correspondingly provided with the first lifting lug and located at the end of the removable casing closer to the permanent casing; the third lifting lug being correspondingly provided with the second lifting lug and located at the end of the removable casing away from the permanent casing; one end of the first wire rope is bound to the third lifting lug, and the other end of the wire rope is passed through the second lifting lug and the first lifting lug and connected to a first winch installed on the construction vessel, the first winch being used to wind up or release the first wire rope.

[0028] Based on the above technical solution, the method for dismantling the split-type casing structure in this embodiment of the invention designs the casing structure as a split structure including a permanent casing and a removable casing. The removable casing is connected to the construction vessel to facilitate the insertion of the permanent casing into the underwater soil layer. After construction is completed, the removable casing is separated from the permanent casing by the pulling force of the underwater soil layer on the permanent casing and the pulling force of the construction vessel on the removable casing. Furthermore, the buoyancy of the water is used to float the removable casing on the water surface, enabling its recycling and thus reducing construction costs. Moreover, the overall structure is simple, and the permanent casing and the removable casing are easy to disassemble. Attached Figure Description

[0029] 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:

[0030] Figure 1 This is a schematic diagram of the assembly of the split-type casing structure with the construction vessel in the dismantling method of the split-type casing structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the split-type casing structure and its assembly with the construction vessel during the dismantling method of the split-type casing structure of the present invention, from another angle.

[0032] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the construction vessel used in the dismantling method for the split-type casing structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the split-type casing structure during water transport in the dismantling method of the split-type casing structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the split-type casing structure rotating downwards in the vertical plane in the dismantling method of the split-type casing structure of the present invention;

[0036] Figure 7 This is a schematic diagram of the split-type casing structure vertically installed in the water in the method for dismantling the split-type casing structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure after the pile construction is completed in the method for dismantling the split-type casing structure of the present invention;

[0038] Figure 9 This is a schematic diagram of the structure during pile driving construction in the method for dismantling the split-type casing structure of the present invention.

[0039] Figure 10 This is a schematic diagram of the structure when the removable casing and the permanent casing are separated in the method for dismantling the split casing structure of the present invention;

[0040] Figure 11 This is a schematic diagram of the structure of the removable casing during horizontal movement in the method for dismantling the split casing structure of the present invention;

[0041] Figure 12 This is a schematic diagram of the structure of the detachable casing in the method for dismantling the split casing structure of the present invention, showing the casing beginning to rotate upward in the vertical plane;

[0042] Figure 13 This is a schematic diagram of the structure of the removable casing after it has been rotated upwards at a certain angle in the vertical plane, as described in the method for dismantling the split casing structure of the present invention.

[0043] Figure 14 This is a schematic diagram of the structure of the removable casing floating on the water surface in the method for dismantling the split casing structure of the present invention;

[0044] Figure 15 This is a schematic diagram of the structure after the first steel wire rope is disconnected from the removable casing and the permanent casing in the dismantling method of the split casing structure of the present invention.

[0045] In the picture:

[0046] 1. Split-type casing structure; 2. Hull; 3. Gantry frame; 4. First winch; 5. Impact hammer; 6. Rotating mechanism; 7. Drilling rig; 8. Second wire rope; 9. First wire rope; 10. Underwater soil layer;

[0047] 11. Removable casing; 12. Permanent casing; 13. Shear-resistant blocks;

[0048] 111. Casing connection; 112. Second lifting lug; 113. Third lifting lug; 121. First lifting lug; 21. Second winch; 22. Connecting piece; 23. Limiting groove;

[0049] 31. Hook. Detailed Implementation

[0050] 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.

[0051] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0052] The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature.

[0053] 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.

[0054] It should also be noted that, for the purpose of illustrating the construction process, in Figures 5-15 The removable casing 11 has been simplified. Figures 1-15 In order to facilitate the illustration of the connection relationship and position of the construction vessel and the split casing structure 1 in a certain construction step, components that are not closely related to the construction step or are not used in the construction step have been simplified or omitted to varying degrees without affecting the understanding of the technical solution of the present invention.

[0055] As attached Figures 1-15 As shown, in an illustrative embodiment of the method for dismantling the split-type casing structure of the present invention, a split-type casing structure 1 is dismantled; the method for dismantling the split-type casing structure includes the following steps:

[0056] Disassembly of removable casing 11 and permanent casing 12: The removable casing 11 is lifted vertically upward by the construction vessel to separate the removable casing 11 from the permanent casing 12.

[0057] The removable casing 11 is kept away from the concrete pile: the construction vessel moves the removable casing 11 horizontally a certain distance to prevent the removable casing 11 from colliding with the concrete pile formed by the split casing structure.

[0058] Rotate the removable casing 11 upwards: Rotate the removable casing 11 upwards in the vertical plane with the connection point with the construction vessel as the center until the removable casing 11 floats on the water surface;

[0059] Release the first wire rope 9 from the removable casing 11 and the permanent casing 12: separate the first wire rope 9, which is used to connect the removable casing 11 and the permanent casing 12, from the removable casing 11 and the permanent casing 12.

[0060] In the above-mentioned method for dismantling the split-type casing structure, the casing structure is designed as a split structure including a permanent casing 12 and a removable casing 11. The removable casing 11 is connected to the construction vessel so that the permanent casing 12 can be inserted into the underwater soil layer 10. After the construction is completed, the removable casing 11 is separated from the permanent casing 12, which can realize the recycling of the removable casing 11, thereby reducing the construction cost. Moreover, the overall structure is simple, and the permanent casing 12 and the removable casing 11 are easy to disassemble.

[0061] In the above-mentioned method for dismantling the split-type casing structure, such as Figures 1-3 As shown, the split-type casing structure 1 includes a permanent casing 12 and a removable casing 11. The removable casing 11 and the permanent casing 12 are arranged coaxially and connected to the rotating mechanism 6. The end of the removable casing 11 away from the rotating mechanism 6 is provided with a casing connection part 111, which is detachably sleeved with the permanent casing 12. The removable casing 11 and the permanent casing 12 are respectively provided with through cavities extending along their axial direction. The through cavity inside the removable casing 11 is connected to the through cavity inside the permanent casing 12 to form a casting cavity. Concrete is poured into the casting cavity to form a concrete pile. The permanent casing 12 is inserted into the underwater soil layer 10. After the concrete pile is formed, the removable casing 11 is separated from the permanent casing 12 so that the removable casing 11 can be recycled and reused.

[0062] In order to facilitate the tailing of the removable casing 11, such as Figure 10As shown, the removable casing 11 is connected to the construction vessel and the permanent casing 12 via a first steel wire rope 9; the permanent casing 12 is provided with a first lifting lug 121, which is located on the outer periphery of the end of the permanent casing 12 away from the underwater soil layer 10; the removable casing 11 is provided with a second lifting lug 112 and a third lifting lug 113, the second lifting lug 112 is correspondingly provided with the first lifting lug 121 and located at the end of the removable casing 11 near the permanent casing 12, and the third lifting lug 113 is correspondingly provided with the second lifting lug 112 and located at the end of the removable casing 11 away from the permanent casing 12. One end of the first wire rope 9 is tied to the third lifting lug 113, and the other end of the first wire rope 9 passes through the second lifting lug 112 and the first lifting lug 121 in sequence before being connected to the first winch 4 on the construction vessel. The first winch 4 winds up the first wire rope 9 to firmly connect the permanent casing 12 and the removable casing 11; the first winch 4 releases the first wire rope 9 to flexibly connect the permanent casing 12 and the removable casing 11, thereby allowing the removable casing 11 to be slid along during dismantling. It should be noted that the construction vessel is equipped with... The system is equipped with two first winches 4, which are connected to two first wire ropes 9 and respectively to the split-type casing structure 1 through the corresponding first wire ropes 9, so as to balance the forces on the split-type casing structure 1. Correspondingly, the permanent casing 12 is provided with two first lifting lugs 121 at the end away from the bottom soil layer 10, and the two first lifting lugs 121 are symmetrically arranged on the outer periphery of the end of the permanent casing 12 away from the bottom soil layer 10. The removable casing 11 is provided with two second lifting lugs 112 at the end connected to the permanent casing 12, and the two second lifting lugs 112 are connected to the two first wire ropes 9. The lifting lugs 121 are positioned and symmetrically arranged on the outer periphery of the end where the removable casing 11 and the permanent casing 12 are connected; the removable casing 11 is provided with two third lifting lugs 113 at the end away from the permanent casing 12, and the two third lifting lugs 113 are positioned and symmetrically arranged on the outer periphery of the end of the removable casing 11 away from the permanent casing 12; it should also be noted that when the permanent casing 12 is inserted into the underwater soil layer 10, the permanent casing 12 and the removable casing 11 are rigidly connected by the first steel wire rope 9 to increase the firmness of the connection between the two.

[0063] Based on the above-mentioned method for dismantling the split-type casing structure, such as Figures 10-15 As shown, the present invention also provides a method for constructing deep-water bored piles, which includes the following steps:

[0064] Piling: The split-type casing structure 1 is transported to the construction location using construction vessels;

[0065] Erecting piles: Vertically placing the split-type casing structure 1 in the water;

[0066] Piling: The permanent casing 12 is inserted vertically into the underwater soil layer 10 using an impact hammer 5 installed on the construction vessel;

[0067] Concrete pouring: Concrete is poured into the split casing structure 1 to form concrete piles;

[0068] Removal of the removable casing: Using the above-mentioned method for removing the split casing structure, the removable casing 11 is separated from the permanent casing 12, and the removable casing 11 is recycled.

[0069] In the above-mentioned deep-water bored pile construction methods, such as Figure 4 As shown, the construction vessel includes a hull 2, a gantry crane 3, a rotating mechanism 6, and a first winch 4. The hull 2 ​​has a horizontally extending limiting groove 23 that extends vertically through the hull 2, used to limit the position of the split-type casing structure 1 on the water surface. The gantry crane 3 is installed on the hull 2 ​​and located above the limiting groove 23, and is connected to a hook 31 for hoisting or towing the split-type casing structure 1. The rotating mechanism 6 is rotatably connected to the hull 2 ​​and located near the limiting groove 23. The rotating mechanism 6 is connected to the split-type casing structure 1 so that the split-type casing structure 1 is rotatably connected to the hull 2 ​​via the rotating mechanism 6. The rotating mechanism 6 is prior art and will not be described further here. The first winch 4 is installed on the hull 2 ​​and is used to wind or release the first wire rope 9. It should be noted that the limiting groove 23 extends horizontally along the left-right direction of the hull 2, and two first winches 4 are symmetrically arranged on both sides before and after the limiting groove 23. It should also be noted that... The hull 2 ​​is also equipped with a pile gripper and an impact hammer 5. The pile gripper is connected to the end of the removable casing 11 away from the permanent casing 12 and is located near the limiting groove 23 to hold the removable casing 11 tightly and prevent the split casing structure 1 from tilting during the pile driving process. The impact hammer 5 is used to apply a downward force to the split casing structure 1 to insert the permanent casing 12 into the underwater soil layer 10. In actual construction, the impact action of the impact hammer 5 alone may not be able to insert the permanent casing 12 to a specific depth. Therefore, the hull 2 ​​is also equipped with a drilling rig 7 located near the gantry 3. The drilling rig 7 drills the underwater soil layer 10, and then the impact hammer 5 assists in inserting the permanent casing 12 into the underwater soil layer 10 to a specified depth. In addition, it should be noted that in order to prevent the removable casing 11 and the permanent casing 12 from rotating relative to each other along the axial direction during the drilling process of the drilling rig 7 drilling the underwater soil layer 10, an anti-shear block 13 is provided between the removable casing 11 and the permanent casing 12.

[0070] In some embodiments, in order to facilitate the transport of the split-type protective sleeve structure 1, the limiting groove 23 is provided with a slot opened in the horizontal direction. The slot is opened on the hull 2 ​​and extends in a direction away from the rotating mechanism 6 so that the split-type protective sleeve structure 1 can be inserted into the limiting groove 23.

[0071] To prevent the split-type casing structure 1 from tilting along the fore-and-aft direction of the hull 2 ​​during pile erection, such as Figure 1The removable casing 11 is connected to the hull 2 ​​via a second steel wire rope 8. The hull 2 ​​is equipped with a second winch 21 for winding or releasing the second steel wire rope 8. During pile driving of the split casing structure 1, the second steel wire rope 8 applies tension to the split casing structure 1 to prevent it from tilting. The speed at which the second winch 21 releases the second steel wire rope 8 is controlled to control the speed at which the split casing structure 1 rotates from the horizontal direction to the vertical direction. It should be noted that, in order to ensure uniform force on the split casing structure 1, the front and rear sides of the limiting groove 23 are symmetrically designed. There is a second winch 21, and two second winches 21 are connected to two second wire ropes 8 respectively and are connected to the split-type casing structure 1 through the corresponding second wire ropes 8. In order to facilitate the connection or separation of the second wire ropes 8 and the split-type casing structure 1, the split-type casing structure 1 is provided with a fourth lifting lug 114. The hull 2 ​​is provided with a connector 22. The end of the second wire rope 8 away from the second winch 21 passes through the fourth lifting lug 114 and is connected to the connector 22. The connector 22 is used to bind the second wire rope 8. The connector 22 is correspondingly set with the second winch 21 and is located on the left side of the hull 2.

[0072] It should be noted that when the buoyancy force on the removable casing 11 is greater than its weight, the removable casing 11 floats on the water surface; when the buoyancy force on the removable casing 11 is less than its weight, the removable casing 11 sinks in the water. Since the removable casing 11 is connected to the hull 2, the end of the removable casing 11 furthest from the hull 2 ​​rotates in the vertical plane under the influence of buoyancy. When the removable casing 11 is removed, the buoyancy force on the removable casing 11 increases, and the end of the removable casing 11 closest to the permanent casing 12 rotates upwards in the vertical plane. The adjustment of buoyancy is common knowledge and will not be elaborated upon here. It should also be noted that… By adjusting the amount of water in the internal cavity of the removable sleeve 11, the buoyancy of the removable sleeve 11 can be adjusted, thereby controlling the movement of the removable sleeve 11. In addition, it should be noted that when the removable sleeve 11 is removed, the upward rotation speed of the removable sleeve 11 may be too fast or too slow. When the upward rotation speed of the removable sleeve 11 is too fast, the downward pulling force applied to the removable sleeve 11 by the first steel wire rope 9 can reduce the upward rotation speed of the removable sleeve 11. Under the combined action of the first steel wire rope 9, the second steel wire rope 8, and the gravity and buoyancy of the removable sleeve 11, the removable sleeve 11 can be rotated upward smoothly.

[0073] The following section uses the construction of the water intake of the Qinghai Province Yellow River Diversion Project in Jining as an example to detail the construction method of deep-water bored piles using a split-type casing structure 1, as well as the removal method of the removable casing 11 after construction. The specific steps of this deep-water bored pile construction method are as follows:

[0074] S1 Piling: Adjust the ballast water volume inside the split-type casing structure 1 so that the buoyancy of the split-type casing structure 1 is greater than its own weight, thereby making the split-type casing structure 1 float on the water surface; use a tugboat to extend the split-type casing structure 1 from the slot opening into the limiting slot 23 to restrict the movement of the split-type casing structure 1 on the water surface; connect the end of the removable casing 11 away from the permanent casing 12 to the rotating mechanism 6 and the hook 31 so that the split-type casing structure 1 can be transported to the construction position under the action of the pulling force of the hook 31 and the buoyancy of deep water.

[0075] S2 Pile Erection: Connect the second wire rope 8 to the second winch 21, connector 22, and split-type casing structure 1 to reduce the buoyancy of the split-type casing structure 1, so that the split-type casing structure 1 rotates vertically downward until it is vertically positioned in the water; when the split-type casing structure 1 begins to rotate vertically downward, the second winch 21 releases the second wire rope 8, and the hook 31 pulls upward to remove the end of the casing 11 away from the permanent casing 12, to prevent the permanent casing 12 from contacting the bottom soil layer 10 and damaging it.

[0076] S3 Piling: After the verticality of the split-type casing structure 1 is tested and meets the construction requirements, the constraint of the second steel wire rope 8 on the split-type casing structure 1 is released, and the first winch 4 winds up the first steel wire rope 9 to tighten it, increasing the firmness of the connection between the removable casing 11 and the permanent casing 12; the pile gripper and the impact hammer 5 cooperate with each other, the pile gripper grips the removable casing 11, and the impact hammer 5 hammers the removable casing 11 to insert the permanent casing 12 into the underwater soil layer 10; the impact hammer 5 hammers the removable casing 11 for a period of time. If the depth of the permanent casing 12 inserted into the underwater soil layer 10 remains unchanged and has not reached the design depth, the drilling rig 7 drills into the underwater soil layer 10, and the impact hammer 5 continues to hammer to remove the casing 11, increasing the depth of the permanent casing 12 inserted into the underwater soil layer 10. If, after the impact hammer 5 continues to hammer for a period of time, the depth of the permanent casing 12 inserted into the underwater soil layer 10 no longer changes and has not reached the design depth, the drilling rig 7 drills into the underwater soil layer 10 again, and the impact hammer 5 continues to hammer to remove the casing 11. This cycle continues until the depth of the permanent casing 12 inserted into the underwater soil layer 10 meets the construction requirements.

[0077] S4 Concrete pouring: Concrete is poured into the cavity of the split-type casing structure 1 through the grouting pipe installed on the construction vessel to form a concrete pile;

[0078] S5 Removal of the removable casing includes the following steps:

[0079] S5.1 Disassembly of the removable casing 11 and the permanent casing 12: The first winch 4 needs to release the first wire rope 9 to release the rigid connection between the removable casing 11 and the permanent casing 12. The construction vessel pulls the removable casing 11 vertically upward to separate the casing connection 111 from the permanent casing 12. It should be noted that when the construction vessel pulls the removable casing 11 upward, if the removable casing 11 and the permanent casing 12 are rigidly connected, the construction vessel will transmit an upward pulling force to the permanent casing 12 through the first wire rope 9, causing the permanent casing 12 to also be pulled upward under the action of the first wire rope 9.

[0080] S5.2 The removable casing 11 is kept away from the concrete pile: The construction vessel moves the removable casing 11 horizontally a certain distance to prevent the end of the removable casing 11 connected to the permanent casing 12 from colliding with the concrete pile formed by the casting of the split casing structure 1 when it rotates upward.

[0081] S5.3 Removable casing 11 rotates upward: The removable casing 11 is rotated vertically in a plane with its connection point with the construction vessel as the center until it floats on the water surface. It should be noted that, since the first wire rope 9 is connected to the permanent casing 12 by passing through both the first lifting lug 121 and the second lifting lug 112, the distance between the first lifting lug 121 and the second lifting lug 112 increases as the removable casing 11 rotates upward. If the length of the first wire rope 9 remains unchanged, it will exert a downward pulling force on the upwardly rotating removable casing 11, thus preventing it from rotating. Therefore, the first winch 4 needs to continuously release the first wire rope 9 to prevent the removable casing 11 from failing to rotate under the pulling force of the first wire rope 9. It should also be noted that the upward rotation speed of the removable casing 11 can be adjusted by adjusting the length of the first wire rope 9 during the upward rotation process.

[0082] S5.4 Release the constraint of the first wire rope 9 on the removable casing 11 and the permanent casing 12: Release the connection between the first wire rope 9 and the third lifting lug 113, and the first winch 4 winds up the first wire rope 9 so that the end of the first wire rope 9 originally connected to the third lifting lug 113 is disconnected from the second lifting lug 112 and the first lifting lug 121, thereby releasing the constraint on the first lifting lug 121 and the second lifting lug 112, thereby releasing the constraint of the first wire rope 9 on the removable casing 11 and the permanent casing 12, and thus completely separating the removable casing 11 and the permanent casing 12.

[0083] The above-mentioned deep-water bored pile construction method utilizes a split casing structure 1 for construction. The removable casing 11 is connected to the construction vessel to facilitate the insertion of the permanent casing 12 into the underwater soil layer 10. After construction is completed, the removable casing 11 can be separated from the permanent casing 12, which enables the recycling of the removable casing 11 and reduces construction costs. Furthermore, the method for disassembling and separating the permanent casing 12 from the removable casing 11 is simple and easy to operate.

[0084] 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.

[0085] 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 of removing a split casing structure for removing a split casing structure, characterized by, The split casing structure comprises a removable casing and a permanent casing, the removable casing is detachably connected with the permanent casing; the removable casing is connected with a construction ship, and the permanent casing is inserted into a soil layer under water; the split casing structure dismounting method comprises the following steps: Dismounting the removable casing from the permanent casing: the removable casing is vertically pulled up by the construction ship to separate the removable casing from the permanent casing; Moving the removable casing away from the concrete pile: the construction ship moves the removable casing horizontally by a distance to prevent the removable casing from colliding with the concrete pile formed by the split casing structure; Rotating the removable casing upward: the removable casing is rotated upward in a vertical plane with the connection between the removable casing and the construction ship as the center until the removable casing floats on the water surface; Releasing the flexible connection of the first steel wire rope to the removable casing and the permanent casing: the first steel wire rope used for connecting the removable casing and the permanent casing is separated from the removable casing and the permanent casing.

2. The split casing structure demolition method according to claim 1, wherein The removable casing rotates in a vertical plane under the action of buoyancy and gravity, and the buoyancy and / or gravity acting on the removable casing is adjusted by adjusting the water inflow in the removable casing.

3. The split casing structure demolition method according to claim 2, wherein In the step of rotating the removable casing upward, the buoyancy acting on the removable casing is greater than the gravity acting on the removable casing.

4. The split casing structure demolition method according to claim 1, wherein The permanent casing is provided with a first lifting lug, the removable casing is provided with a second lifting lug and a third lifting lug, one end of the first steel wire rope is connected with a first winch installed on the construction ship, and the other end of the first steel wire rope is bound with the third lifting lug after passing through the first lifting lug and the second lifting lug.

5. The method of claim 4, wherein, In the step of dismounting the removable casing from the permanent casing, the first winch releases the first steel wire rope to flexibly connect the removable casing and the permanent casing through the first steel wire rope to slide the tail of the removable casing.

6. The split casing structure demolition method according to claim 5, wherein The second lifting lug is located at one end of the removable casing close to the permanent casing, and the third lifting lug is located at one end of the removable casing away from the permanent casing.

7. The split casing structure demolition method according to claim 4, wherein In the step of releasing the flexible connection of the first steel wire rope to the removable casing and the permanent casing, the first steel wire rope is unbound from the third lifting lug, the first winch winds the first steel wire rope to make the first steel wire rope separate from the first lifting lug and the second lifting lug, so that the removable casing and the permanent casing are completely separated.

8. The split casing structure demolition method according to claim 1, wherein The removable casing and the permanent casing are coaxial, and the removable casing is provided with a casing connecting part which is detachably sleeved with the permanent casing.

9. A method of constructing a deep water bored pile, characterized by, The method comprises the following steps: Transporting the pile: the split casing structure is transported to a location to be constructed by the construction ship; Standing the pile: the split casing structure is vertically arranged in water; Driving the pile: the permanent casing is inserted into a soil layer under water in a vertical direction by an impact hammer installed on the construction ship; Pouring concrete: concrete is poured in the split casing structure to form a concrete pile; Dismantling the removable casing: separating the removable casing from the permanent casing using the method of dismantling the split casing structure according to any one of claims 1-8, and recycling the removable casing.

10. The method of construction of a deep water bored pile according to claim 9, wherein, In the piling step, the first wire rope is wound by a first winch to bind the removable casing with the permanent casing.

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