Split casing structure and its removal method

Abstract

The present invention relates to a split casing structure and a method for removing the same, belonging to the field of engineering construction technology. The split casing structure includes a permanent casing and a removable casing; the permanent casing is inserted into a submerged soil layer; the removable casing is coaxially arranged with the permanent casing and connected to the permanent casing by a first steel wire rope; the end of the removable casing away from the permanent casing is connected to a construction vessel, and the end of the removable casing close to the permanent casing is provided with a casing connection portion, which is detachably connected to the permanent casing. The split casing structure provided by the present invention is designed 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 submerged soil layer; by separating the removable casing from the permanent casing after construction is completed, the removable casing can be recycled, thereby reducing construction costs; moreover, the overall structure is simple, and the permanent casing and the removable casing are easy to remove.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering construction, and in particular relates to a split casing structure and a dismantling method thereof. Background Art

[0002] Bored piles are a common method for deep-water pile foundation construction. First, the casing is inserted deep into the water and vertically extended into the underwater soil layer. Then, concrete is poured inside the casing. After the concrete pouring is completed, the casing is removed. The traditional casing removal method often uses the method of cutting off the middle of the casing; this method occupies the casing for a long time, consumes high costs, and the casing cannot be reused, resulting in a waste of resources. Patent CN111926808A discloses a removable casing structure for a deep-water pile foundation and its construction method. The casing structure is designed to be a steel casing and a sleeve. The sleeve is inserted into the underwater soil layer. After the concrete is poured, the steel casing is separated from the sleeve to achieve the reuse of the steel casing. Although the above-mentioned removable casing effectively solves the problem that the casing cannot be reused, in the prior art, the casing in deep-water pile foundation construction is lifted and then turned over by a double crane ship, or a single crane ship is used in conjunction with a pile turner or a pile erecting trolley for pile erection. The installation process of the casing is relatively cumbersome, which results in the above-mentioned removable casing also needing to be dismantled with a double crane ship or a crane ship in conjunction with a pile turner or a pile erecting trolley. The cumbersome casing disassembly construction undoubtedly increases the cost of deep-water pile foundation construction and also increases the construction period.

[0003] Therefore, designing a method to facilitate the removal of casing from deep water is of great significance for deep-water bored pile construction. Summary of the Invention

[0004] In view of the deficiencies in the related art, the present invention provides a split casing structure and a dismantling method thereof, so as to design the casing to be split, thereby facilitating the recycling of the casing.

[0005] The present invention provides a split casing structure, comprising:

[0006] Permanent casing, which is inserted into the subaqueous soil;

[0007] The removable casing is coaxially arranged with the permanent casing and detachably connected to the permanent casing; one end of the removable casing away from the permanent casing is connected to the construction vessel; the removable casing and the permanent casing are also connected by a first steel wire rope.

[0008] This technical solution designs the casing structure as a split type, uses a removable casing to connect with the construction vessel, so as to facilitate the insertion of the permanent casing into the underwater soil layer; the removable casing is detachably connected to the permanent casing, so that after the construction is completed, the removable casing can be separated from the permanent casing, thereby realizing the recycling of the removable casing and reducing construction costs; by providing a first steel wire rope, the removable casing is firmly bound to the permanent casing when the permanent casing is inserted into the underwater soil layer, and the removable casing is flexibly connected to the permanent casing when the removable casing is removed, thereby preventing tail slippage.

[0009] In some embodiments, the permanent casing is provided with a first lifting lug, which is 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 is arranged corresponding to the first lifting lug and is located at the end of the removable casing close to the permanent casing; the third lifting lug is arranged corresponding to the second lifting lug and is 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 is connected to a first winch installed on the construction vessel, and the first winch is used to reel in or release the first wire rope.

[0010] This technical solution provides a first lifting eye and a second lifting eye, and uses a first steel wire rope to pass through the first lifting eye and the second lifting eye to connect the removable casing and the permanent casing; and provides a third lifting eye, and uses the first steel wire rope to bind the third lifting eye, so that when the first winch reels in the first steel wire rope, the first steel wire rope can increase the firmness of the connection between the removable casing and the permanent casing.

[0011] In some embodiments, the removable casing is connected to the construction vessel via a second steel wire rope; the construction vessel is provided with a second winch and a connecting piece, one end of the second steel wire rope is connected to the second winch, and the other end of the second steel wire rope passes through the fourth lifting lug of the removable casing and is connected to the connecting piece.

[0012] In some embodiments, the fourth lifting eye is located at an end of the removable casing close to the permanent casing, and the connecting member is provided close to the second hoist.

[0013] This technical solution provides a fourth lifting eye, which is used to connect the second steel wire rope, so that the second hoist can apply tension to the removable casing.

[0014] In addition, the present invention also provides a method for dismantling a split casing structure, which is used to dismantle the above-mentioned split casing structure; the method for dismantling a split casing structure comprises the following steps:

[0015] The first hoist releases the first steel wire rope to release the rigid constraint of the first steel wire rope on the removable casing and the permanent casing;

[0016] The construction vessel pulls the removable casing vertically upwards to separate the removable casing from the permanent casing;

[0017] The construction vessel drives the removable casing to move horizontally for a certain distance;

[0018] Rotate the removable casing upward in a vertical plane with the connection point between the removable casing and the construction vessel as the center of the circle until the removable casing floats on the sea surface;

[0019] The connection between the first wire rope and the third lifting eye is released, and the first winch reels in the first wire rope so that the end of the first wire rope away from the first winch is detached from the second lifting eye and the first lifting eye to completely separate the removable casing from the permanent casing.

[0020] In some embodiments, after the removable casing is separated from the permanent casing, the removable casing is flexibly connected to the permanent casing via a first steel wire rope so as to perform tail sliding of the removable casing.

[0021] In some embodiments, when the casing connection portion is separated from the permanent casing and the construction vessel drives the removable casing to move horizontally, the second winch continuously releases the second steel wire rope to prevent the second steel wire rope from applying tension to the removable casing.

[0022] In some embodiments, when the removable casing rotates upward, the second hoist reels in the second steel wire rope, so that the second steel wire rope applies tension to the removable casing to control the rotation speed of the removable casing and constrain its rotation direction.

[0023] In some embodiments, the removable casing rotates in a vertical plane under the action of buoyancy, gravity and / or tension of the second wire rope.

[0024] In some embodiments, the gravity and / or buoyancy of the removable casing is adjusted by adjusting the amount of water entering the removable casing.

[0025] Based on the above technical solution, the split casing structure in the embodiment of the present invention is designed 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 the construction is completed, the removable casing is separated from the permanent casing and the removable casing in the water is floated on the water surface by utilizing the deep water buoyancy to achieve the recycling of the removable casing, thereby reducing the construction cost. Moreover, the overall structure is simple, and the permanent casing and the removable casing are easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 This is a schematic diagram of the structure of the split casing structure of the present invention when assembled with a construction vessel;

[0028] Figure 2 A schematic structural diagram of the split casing structure of the present invention when assembled with a construction vessel from another angle;

[0029] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0030] Figure 4 A schematic structural diagram of a construction vessel for installing the split casing structure of the present invention;

[0031] Figure 5 This is a schematic structural diagram of the split casing structure of the present invention during transportation on the water surface;

[0032] Figure 6 This is a schematic structural diagram of the split casing structure of the present invention when it rotates downward in a vertical plane;

[0033] Figure 7 This is a schematic diagram of the structure of the split casing structure of the present invention when it is vertically arranged in water;

[0034] Figure 8 This is a structural schematic diagram of the split casing structure of the present invention when pile construction is completed;

[0035] Figure 9 This is a schematic diagram of the structure of the split casing structure of the present invention during piling construction;

[0036] Figure 10 It is a structural schematic diagram of the split casing structure of the present invention when the removable casing is separated from the permanent casing;

[0037] Figure 11 It is a structural schematic diagram of the removable casing in the split casing structure of the present invention when it moves horizontally;

[0038] Figure 12 It is a structural schematic diagram of the removable casing in the split casing structure of the present invention when it starts to rotate upward in a vertical plane;

[0039] Figure 13 This is a schematic diagram of the structure of the removable casing in the split casing structure of the present invention after being rotated upward by a certain angle in the vertical plane;

[0040] Figure 14 This is a schematic diagram of the structure of the removable casing floating on the water surface in the split casing structure of the present invention;

[0041] Figure 15This is a schematic diagram of the structure after the first steel wire rope in the split casing structure of the present invention releases the connection between the removable casing and the permanent casing.

[0042] In the picture:

[0043] 1. Split casing structure; 2. Hull; 3. Gantry; 4. First winch; 5. Impact hammer; 6. Rotating mechanism; 7. Drilling rig; 8. Second wire rope; 9. First wire rope; 10. Submerged soil layer;

[0044] 11. Removable casing; 12. Permanent casing; 13. Shear block;

[0045] 111, casing connection; 112, second lifting eye; 113, third lifting eye; 121, first lifting eye; 21, second hoist; 22, connector; 23, limit slot;

[0046] 31. Hook. DETAILED DESCRIPTION

[0047] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0049] The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of such features.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] It should also be noted that in order to facilitate the illustration of the construction process, Figure 5-Figure 15 The removable casing 11 is simplified in Figures 1-15 In order to facilitate the illustration of the connection relationship and position status between the construction vessel and the split casing structure 1 in a certain construction step, without affecting the understanding of the technical solution of the present invention, the components that are not highly relevant to the construction step or are not used in the construction step are simplified or omitted to varying degrees.

[0052] As attached Figure 1-Figure 3 As shown, in an exemplary embodiment of the split casing structure of the present invention, the split casing structure includes a permanent casing 12 and a removable casing 11; the removable casing 11 and the permanent casing 12 are coaxially arranged and connected to the rotating mechanism 6, and the end of the removable casing 11 away from the rotating mechanism 6 is provided with a casing connecting portion 111, and the casing connecting portion 111 is detachably sleeved with the permanent casing 12 so that the removable casing 11 and the permanent casing 12 are detachably connected; the removable casing 11 and the permanent casing 12 are respectively provided with a through cavity extending along the axial direction thereof, the through cavity inside the removable casing 11 is connected with the through cavity inside the permanent casing 12 and forms a casting cavity, and concrete is poured into the casting cavity to form a concrete pile; the permanent casing 12 is inserted into the underwater soil layer 10, and the removable casing 11 is separated from the permanent casing 12 after the concrete pile is cast and formed, so that the removable casing 11 can be recovered and recycled.

[0053] The above-mentioned split casing structure is designed as a split structure including a permanent casing 12 and a removable casing 11, and 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 the construction is completed, the removable casing 11 is separated from the permanent casing 12, and the removable casing 11 can be recycled, thereby reducing construction costs; moreover, the overall structure is simple, and the permanent casing 12 and the removable casing 11 are easy to disassemble.

[0054] In order to increase the firmness of the connection between the permanent casing 12 and the removable casing 11, as shown in FIG. Figure 10As shown, the permanent casing 12 is connected to the removable casing 11 through the first steel wire rope 9. When the permanent casing 12 is inserted into the submerged soil layer 10, the permanent casing 12 and the removable casing 11 are rigidly connected through the first steel wire rope 9 to increase the firmness of the connection between the two. When the removable casing 11 is recovered, the permanent casing 12 and the removable casing 11 are flexibly connected through the first steel wire rope 9 to perform tail sliding during the upward rotation of the removable casing 11. It should be noted that the permanent casing 12 is provided with a first lifting lug 121, which is provided on the outer periphery of the permanent casing 12 away from the submerged soil layer 10. The removable casing 11 is provided with a second lifting eye 112 and a third lifting eye 113. The second lifting eye 112 is provided corresponding to the first lifting eye 121 and is located at the end of the removable casing 11 close to the permanent casing 12. The third lifting eye 113 is provided corresponding to the second lifting eye 112 and is located at the end of the removable casing 11 away from the permanent casing 12. One end of the first wire rope 9 is bound to the third lifting eye 113, and the other end of the first wire rope 9 passes through the second lifting eye 112 and the first lifting eye 121 in sequence and is connected to the first winch 4 on the construction vessel. The first winch 4 reels in the first wire rope 9 to make the permanent casing 1 2 is firmly connected to the removable casing 11; the first winch 4 releases the first steel wire rope 9 to flexibly connect the permanent casing 12 to the removable casing 11, thereby preventing the removable casing 11 from slipping during the removal of the removable casing 11; it should also be noted that two first winches 4 are installed on the construction vessel, and the two first winches 4 are correspondingly connected to the two first steel wire ropes 9 and are respectively connected to the split casing structure 1 through the corresponding first steel wire ropes 9, so that the split casing structure 1 is balanced in force; accordingly, the end of the permanent casing 12 away from the underwater soil layer 10 is provided with two first lifting ears 1 21. Two first lifting eyes 121 are symmetrically arranged on the outer periphery of the end of the permanent casing 12 away from the underwater soil layer 10; two second lifting eyes 112 are arranged on the end of the removable casing 11 connected to the permanent casing 12. The two second lifting eyes 112 are arranged in positions corresponding to the two first lifting eyes 121 and are symmetrically arranged on the outer periphery of the end of the removable casing 11 connected to the permanent casing 12; two third lifting eyes 113 are arranged on the end of the removable casing 11 away from the permanent casing 12. The two third lifting eyes 113 are arranged in positions corresponding to the two second lifting eyes 112 and are symmetrically arranged on the outer periphery of the end of the removable casing 11 away from the permanent casing 12. In addition, it should be noted that in some embodiments, the fourth lifting eye is the second lifting eye 112, that is, the second lifting eye 112 is connected to both the first steel wire rope 9 and the second steel wire rope 8, so as to simplify the structure of the removable casing 11.

[0055] In order to restrict the direction of rotation of the removable casing 11 in the vertical plane, as shown in FIG. Figure 7As shown, the construction vessel is connected to the removable casing 11 through the second steel wire rope 8; the removable casing 11 is provided with a fourth lifting eye, and a connecting piece 22 is provided on the hull 2. One end of the second steel wire rope 8 is connected to the second winch 21 installed on the construction vessel, and the other end of the second steel wire rope 8 passes through the fourth lifting eye and is connected to the connecting piece 22. The connecting piece 22 is arranged corresponding to the second winch 21 and is located on the left side of the hull 2; the second winch 21 reels or releases the second steel wire rope 8 to rotate the removable casing 11 in a vertical plane and constrain the rotation direction of the removable casing 11; it should be noted that During the removal of the removable casing 11, the second steel wire rope 8 applies tension to the removable casing 11 to prevent the removable casing 11 from tilting and controls the speed of releasing the second steel wire rope 8 by the second winch 21 to control the speed of the split casing structure 1 rotating from the horizontal direction to the vertical direction; it should also be noted that in order to make the removable casing 11 evenly stressed, a second winch 21 is respectively provided on the front and rear sides of the limiting groove 23, and the two second winches 21 are correspondingly connected to two second steel wire ropes 8 and are respectively connected to the removable casing 11 through the corresponding second steel wire ropes 8.

[0056] In the above-mentioned split casing structure, the removable casing 11 includes several casing segments, and the heads and tails of the several casing segments are detachably connected so that the length of the removable casing 11 can be spliced ​​according to actual construction needs to meet different water depth requirements; the casing segment has a first end and a second end, and the second end is provided with a segment connecting portion, which is socketed with the first end of the adjacent casing segment; it should be noted that the adjacent casing segments are sealed with sealing members to prevent concrete from leaking from the gaps between the adjacent casing segments during pouring.

[0057] Based on the above split casing structure, Figure 10-15 As shown, the present invention also provides a method for removing a split casing structure, which is used to remove the above-mentioned removable casing 11; the method for removing the removable casing 11 includes the following steps:

[0058] The first winch 4 releases the first steel wire rope 9 to release the rigid constraint of the first steel wire rope 9 on the removable casing 11 and the permanent casing 12; it should be noted that when the permanent casing 12 is inserted into the underwater soil layer 10, the first steel wire rope 9 firmly binds the removable casing 11 and the permanent casing 12. Therefore, when removing the removable casing 11, it is necessary to first release the rigid constraint of the first steel wire rope 9 on the removable casing 11 and the permanent casing 12.

[0059] The construction vessel vertically pulls up the removable casing 11 to separate the casing connection portion 111 from the permanent casing 12; it should be noted that, since concrete piles are formed in the casting cavity, the removable casing 11 must be separated not only from the permanent casing 12 but also from the concrete piles; it should also be noted that, in the process of the construction vessel vertically pulling up the removable casing 11, the first winch 4 needs to continue to release the first steel wire rope 9 to prevent the construction vessel from pulling the removable casing 11 upward. The pulling force of the construction vessel is transmitted to the permanent casing 12 through the first steel wire rope 9, thereby preventing the permanent casing 12 from being pulled upward under the action of the first steel wire rope 9.

[0060] The construction vessel drives the removable casing 11 to move horizontally for a distance to prevent the end of the removable casing 11 connected to the permanent casing 12 from colliding with the concrete pile when it rotates upward; it should be noted that the removable casing 11 and the permanent casing 12 are flexibly connected by the first wire rope 9 to allow the removable casing 11 to slide; it should also be noted that when the casing connection part 111 is separated from the permanent casing 12 and the construction vessel drives the removable casing 11 to move horizontally, the second winch 21 continuously releases the second wire rope 8 to prevent the second wire rope 8 from applying tension to the removable casing 12.

[0061] The removable casing 11 is rotated upward in a vertical plane with the connection between it and the construction vessel as the center until the removable casing 11 floats on the sea surface; it should be noted that during the upward rotation of the removable casing 11, the second winch 21 reels the second steel wire rope 8, so that the second steel wire rope 8 applies tension to the removable casing 11 to control the rotation speed of the removable casing 11 and constrain its rotation direction; since the removable casing 11 is prone to tilt in the horizontal plane during the vertical upward rotation process, the second steel wire rope 8 is set to pull the removable casing 11 to constrain the direction of the removable casing 11; it should also be noted that the second steel wire rope 8 can also apply upward pulling force to the removable casing 11 to rotate the removable casing 11 upward.

[0062] The connection between the first wire rope 9 and the third lifting eye 113 is released, and the first hoist 4 reels the first wire rope 9 so that the end of the first wire rope 9 away from the first hoist 4 is detached from the second lifting eye 112 and the first lifting eye 121 to completely separate the removable casing 11 from the permanent casing 12.

[0063] It should be noted that when the buoyancy of the removable casing 11 is greater than the gravity it is subjected to, the removable casing 11 floats on the water surface, and when the buoyancy of the removable casing 11 is less than the gravity it is subjected to, the removable casing 11 sinks into the water; since the removable casing 11 is connected to the hull 2, the end of the removable casing 11 away from the hull 2 ​​rotates in the vertical plane under the action of buoyancy; when the removable casing 11 is removed, the buoyancy of the removable casing 11 increases, and the end of the removable casing 11 close to the permanent casing 12 rotates upward in the vertical plane; the adjustment of buoyancy is a common knowledge technology and will not be repeated here; it should also be noted that By adjusting the amount of water in the internal cavity of the removable casing 11, the buoyancy of the removable casing 11 can be adjusted, thereby controlling the movement of the removable casing 11. In addition, it should be noted that when the removable casing 11 is removed, the speed at which the removable casing 11 rotates upward may be too fast or too slow. When the speed at which the removable casing 11 rotates upward is too fast, the downward pulling force applied to the removable casing 11 by the first steel wire rope 9 can reduce the speed at which the removable casing 11 rotates upward. The removable casing 11 can be rotated upward smoothly by the combined action of the gravity and buoyancy of the first steel wire rope 9, the second steel wire rope 8 and the removable casing 11.

[0064] The above-mentioned method for removing the split casing structure is easy and simple to operate, takes a short time, causes little damage to the removable casing 11 and the permanent casing 12 , and can realize the recovery and recycling of the removable casing 11 .

[0065] In actual application, the above-mentioned split casing structure is transported, installed and removed by construction vessels; Figure 4As shown, the construction vessel includes a hull 2, a gantry 3, a rotating mechanism 6 and a first winch 4; the hull 2 ​​is provided with a limit groove 23 extending in the horizontal direction, and the limit groove 23 is arranged to pass through the hull 2 ​​in the vertical direction. The limit groove 23 is used to limit the position of the split casing structure 1 on the water surface to constrain the position of the split casing structure 1 during transportation; the gantry 3 is installed on the hull 2 ​​and is located above the limit groove 23. The gantry 3 is connected to a hook 31 for lifting or dragging the split casing structure 1; the rotating mechanism 6 is rotatably connected to the hull 2 ​​and close to the limit groove The groove 23 is provided, and the rotating mechanism 6 is connected to the split casing structure 1 so that the split casing structure 1 is rotatably connected to the hull 2 ​​through the rotating mechanism 6; the rotating mechanism 6 belongs to the prior art and will not be described here; the first winch 4 is installed on the hull 2 ​​for winding or releasing the first wire rope 9; it should be noted that the limiting groove 23 extends in the left and right directions of the hull 2 ​​in the horizontal plane, and the two first winches 4 are symmetrically arranged on both sides of the limiting groove 23; in order to facilitate the transportation of the split casing structure 1, the limiting groove 23 is provided with a notch opened in the horizontal direction, and the groove The opening is opened in the hull 2 ​​and extends in a direction away from the rotating mechanism 6, so that the split casing structure 1 can be extended into the limiting groove 23. It should also be noted that a pile gripper and an impact hammer 5 are also installed on the hull 2. The pile gripper is connected to the end of the removable casing 11 away from the permanent casing 12 and is arranged near the limiting groove 23 to hold the removable casing 11 tightly and prevent the split casing structure 1 from tilting after the pile is erected or during the piling 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 permanent casing 12 may not be inserted to a specific depth by the impact of the impact hammer 5 alone. Therefore, the hull 2 ​​is also equipped with a drilling rig 7 arranged near the gantry 3. The drilling rig 7 drills the underwater soil layer 10 to assist the impact hammer 5 in inserting the permanent casing 12 to the specified depth of the underwater soil layer 10. 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 of the underwater soil layer 10 by the drilling rig 7, a shear block 13 is provided between the removable casing 11 and the permanent casing 12.

[0066] Taking the water intake construction of the Yellow River to Jining Project in Qinghai Province as an example, the application of the split casing structure in deep-water bored pile construction and the removal method of the removable casing 11 after the construction is completed are introduced in detail.

[0067] The deep-water bored pile construction method specifically comprises the following steps:

[0068] Pile transportation: adjust the amount of ballast water in the casting cavity of the split casing structure 1 so that the buoyancy of the split casing structure 1 is greater than its own weight, so that the split casing structure 1 floats on the water surface; use a tugboat to extend the split casing structure 1 from the notch into the limit groove 23 to limit the movement of the split 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 casing structure 1 is transported to the construction location under the pulling force of the hook 31 and the deep water buoyancy.

[0069] Stake erection: connect the second steel wire rope 8 to the second hoist 21, the connector 22, and the split casing structure 1; reduce the buoyancy of the split casing structure 1 so that the split casing structure 1 rotates vertically downward until the split casing structure 1 is vertically placed in the water; when the split casing structure 1 begins to rotate vertically downward, the second hoist 21 releases the second steel wire rope 8, which is used to constrain the vertical downward rotation direction of the split casing structure 1 to prevent the split casing structure 1 from tilting along the front and rear direction of the hull 2; and the hook 31 pulls up one end of the removable casing 11 away from the permanent casing 12 to prevent the permanent casing 12 from contacting the underwater soil layer 10 and damaging the permanent casing 12.

[0070] Pile driving: After the verticality test of the split casing structure 1 is completed and the verticality of the split casing structure 1 meets the construction requirements, the first winch 4 reels the first steel wire rope 9 to tighten the first steel wire rope 9 to increase 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 holds the removable casing 11 tightly, and the impact hammer 5 hammers the removable casing 11 to insert the permanent casing 12 into the underwater soil layer 10; after the impact hammer 5 hammers the removable casing 11 for a period of time, if the permanent casing 12 is inserted into the underwater soil layer If the depth of the soil layer 10 remains unchanged and has not reached the design construction depth, after the drilling rig 7 drills the underwater soil layer 10, the impact hammer 5 continues to hammer the removable casing 11 to increase the depth of the permanent casing 12 inserted into the underwater soil layer 10; if 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 construction depth, the drilling rig 7 drills the underwater soil layer 10 again, and the impact hammer 5 continues to hammer the removable casing 11, and the cycle continues until the depth of the permanent casing 12 inserted into the underwater soil layer 10 meets the construction requirements.

[0071] Pouring concrete: concrete is poured into the through cavity of the split casing structure 1 through a grouting pipe provided on the construction vessel to form a concrete pile.

[0072] Removing the removable casing: The first winch 4 releases the first steel wire rope 9, and the hook 31 pulls the removable casing 11 vertically upward until the removable casing 11 is separated from the permanent casing 12 and the concrete pile; the construction vessel drives the removable casing 11 to move horizontally away from the concrete pile; at the same time, the second winch 21 releases the second steel wire rope 8 to prevent the second steel wire rope 8 from exerting tension on the removable casing 11; the buoyancy of the removable casing 11 is increased, and the second winch 21 reels the second steel wire rope 8. The second steel wire rope 8 applies tension to the removable casing 11, causing the end of the removable casing 11 away from the construction vessel to rotate upward in the vertical direction until the removable casing 11 floats on the water surface in the horizontal direction; the connection between the first steel wire rope 9 and the third lifting eye 113 is released, and the first winch 4 reels the first steel wire rope 9, so that the first steel wire rope 9 is separated from the first lifting eye 121 and the second lifting eye 112, and the connection between the removable casing 11 and the permanent casing 12 is released, thereby realizing the recovery of the removable casing 11.

[0073] The above-mentioned deep-water bored pile construction method utilizes a split casing structure 1 for construction, and utilizes a removable casing 11 to be connected to a construction vessel so as to facilitate the insertion of a permanent casing 12 into the underwater soil layer 10; by separating the removable casing 11 from the permanent casing 12 after the construction is completed, the removable casing 11 can be recycled, thereby reducing construction costs; and the method for disassembling and separating the permanent casing 12 from the removable casing 11 is simple and easy to operate.

[0074] 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.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A split casing structure, characterized in that: include: Permanent casing, which is inserted into the subaqueous soil; The permanent casing is provided with a first lifting lug, and the first lifting lug is located at an end of the permanent casing away from the bottom soil layer; A removable casing is coaxially arranged with the permanent casing and detachably connected to the permanent casing; the end of the removable casing away from the permanent casing is connected to the construction vessel; the removable casing is provided with a second lifting lug and a third lifting lug, the second lifting lug is arranged corresponding to the first lifting lug and is located at the end of the removable casing close to the permanent casing; the third lifting lug is arranged corresponding to the second lifting lug and is located at the end of the removable casing away from the permanent casing; The removable casing is also connected to the permanent casing by a first steel wire rope; one end of the first steel wire rope is bound to the third lifting eye, and the other end of the steel wire rope is passed through the second lifting eye and the first lifting eye and then connected to the first winch installed on the construction vessel, and the first winch is used to reel in or release the first steel wire rope.

2. The split casing structure according to claim 1, characterized in that: The removable casing is connected to the construction vessel through a second steel wire rope; the construction vessel is provided with a second winch and a connecting piece, one end of the second steel wire rope is connected to the second winch, and the other end of the second steel wire rope passes through the fourth lifting lug of the removable casing and is connected to the connecting piece.

3. The split casing structure according to claim 2, characterized in that: The fourth lifting eye is located at one end of the removable casing close to the permanent casing, and the connecting piece is arranged close to the second hoist.

4. A method for dismantling a split casing structure, for dismantling the split casing structure according to claim 3; characterized in that: The split casing structure removal method comprises the following steps: The first hoist releases the first steel wire rope to release the rigid constraint of the first steel wire rope on the removable casing and the permanent casing; The construction vessel vertically pulls the removable casing upward to separate the removable casing from the permanent casing; The construction vessel drives the removable casing to move horizontally for a certain distance; Rotating the removable casing upward in a vertical plane with the connection point between the removable casing and the construction vessel as the center of the circle until the removable casing floats on the sea surface; The connection between the first steel wire rope and the third lifting eye is released, and the first hoist reels in the first steel wire rope so that the end of the first steel wire rope away from the first hoist is detached from the second lifting eye and the first lifting eye, thereby completely separating the removable casing from the permanent casing.

5. The method for removing the split casing structure according to claim 4, characterized in that: After the removable casing is separated from the permanent casing, the removable casing is flexibly connected to the permanent casing via the first steel wire rope so as to slide the removable casing.

6. The method for removing a split casing structure according to claim 4, wherein: When the casing connection portion is separated from the permanent casing and the construction vessel drives the removable casing to move horizontally, the second winch continuously releases the second steel wire rope to prevent the second steel wire rope from applying tension to the removable casing.

7. The method for removing the split casing structure according to claim 6, characterized in that: During the upward rotation of the removable casing, the second hoist reels in the second steel wire rope, so that the second steel wire rope applies tension to the removable casing to control the rotation speed of the removable casing and constrain its rotation direction.

8. The method for removing the split casing structure according to claim 7, characterized in that: The removable casing rotates in a vertical plane under the action of buoyancy, gravity and / or the tension of the second steel wire rope.

9. The method for removing a split casing structure according to claim 8, characterized in that: The gravity and / or buoyancy of the removable casing is adjusted by adjusting the amount of water entering the removable casing.

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