A method for removing existing steel sheet piles at a wharf

Abstract

The present application relates to the technical field of wharf reconstruction, and provides a wharf existing steel sheet pile removing method, which comprises the following steps: inserting a cutting guide pile into the side of the steel sheet pile to be removed, the cutting guide pile being provided with a guide through slot on the side thereof facing the steel sheet pile; arranging a first cutting device in the cutting guide pile, moving the first cutting device along the axial direction of the cutting guide pile, so that the first cutting device cuts the steel sheet pile through the guide through slot, and cuts the steel sheet pile into at least two segments, and excavating the soil on the side of the steel sheet pile to a specified elevation; and using a hoisting device to pull out the segments of the steel sheet pile from the ground respectively. The present application can overcome the technical problem that the existing technology adopts a whole pulling-out mode of the steel sheet pile by using a hoisting device, and needs to overcome the sum of the dead weight of the steel sheet pile and the transverse connecting structure, and the sum of the side friction of the steel sheet pile and the transverse connecting structure and the soil, and the hoisting capacity is very easy to be insufficient, and even the hoisting device is damaged.

Description

Technical Field

[0001] This invention relates to the field of wharf renovation technology, and in particular to a method for removing existing steel sheet piles at a wharf. Background Technology

[0002] To achieve purposes such as support, retaining soil, and waterproofing, some wharves install steel sheet piles on the water-facing side. The bottom of the steel sheet piles is driven into the soil, and the top of the steel sheet piles is filled with a concrete breast wall. To ensure structural stability, the steel sheet piles often have a considerable depth, often penetrating into hard soil layers and below, exceeding 20m in depth, and sometimes even exceeding 40m. Furthermore, there are often transverse connecting structures, such as steel tie rods, between two rows of steel sheet piles to connect the steel sheet piles into a whole.

[0003] Sometimes, due to the needs of subsequent construction or new projects, it is necessary to remove these sheet piles. However, as mentioned above, most of the sheet pile structure is located underground or underwater, and commonly used demolition equipment, such as crushers and excavators, can only work on the ground and cannot go deep underground. Therefore, it is difficult to remove these sheet piles. The existing demolition method is often to use lifting equipment to pull the sheet pile out of the soil as a whole.

[0004] However, since sheet piles and their lateral connections rub against the surrounding soil, this removal method requires the lifting capacity of the crane to be at least greater than the sum of the self-weight of the sheet piles and the lateral connections, as well as the sum of the lateral friction between the sheet piles, the lateral connections, and the soil. It is often only suitable for removing sheet piles that are small in size or shallow in depth. If applied to the removal of sheet piles at wharves, it is easy for the sheet piles to be unable to be pulled out or even for the crane to be damaged. Therefore, it is necessary to develop a new type of sheet pile removal solution for wharves. Summary of the Invention

[0005] The purpose of this invention is to overcome the technical problems of existing technologies that use lifting equipment to pull out sheet piles as a whole when dismantling them. These problems require overcoming the combined weight of the sheet piles and the transverse connecting structures, as well as the combined lateral friction between the sheet piles, the transverse connecting structures, and the soil. This can easily lead to insufficient lifting capacity or even damage to the lifting equipment. The invention provides a method for dismantling existing sheet piles at wharves.

[0006] In a first aspect, the present invention provides a method for removing existing steel sheet piles at a wharf, comprising the following steps:

[0007] S1. Insert a cutting guide pile into at least one side of the sheet pile to be demolished. The angle between the axis of the cutting guide pile and the horizontal is greater than zero. The cutting guide pile is hollow inside and a guide groove is provided on the side of the cutting guide pile facing the sheet pile.

[0008] S2. A first cutting device is installed inside the cutting guide pile. The position of the first cutting device along the axial direction of the cutting guide pile is adjustable. The first cutting device is moved along the axial direction of the cutting guide pile so that the first cutting device cuts the steel sheet pile through the guide groove and cuts the steel sheet pile into at least two segments along the first direction, which is parallel to the axial direction of the cutting guide pile. The soil on the side of the steel sheet pile is excavated to the specified elevation.

[0009] S3. Use lifting equipment to pull the steel sheet piles out of the ground in sections.

[0010] In this method, when removing sheet piles, a cutting guide pile is first inserted into at least one side of the sheet pile. Since the cutting guide pile is a tubular component, it is easily driven into the ground and reaches the bottom of the sheet pile. The side of the cutting guide pile facing the sheet pile has a guide groove. Therefore, if the first cutting device is placed inside the cutting guide pile, the cutting component of the first cutting device, such as a saw blade or a grinding wheel, can pass through the guide groove and contact the sheet pile, cutting the corresponding position of the sheet pile after activation. Then, the first cutting device is moved along the axial direction of the cutting guide pile to cut the sheet pile along the moving path until the sheet pile is cut into at least two smaller segments distributed along the length of the sheet pile. Therefore, the weight of a single segment and the lateral friction between it and the soil are reduced compared to before cutting. At the same time, this method also excavates the soil on the side of the sheet pile, further reducing the lateral friction between the sheet pile segments and the soil, thereby reducing the lifting capacity required for each lifting operation, significantly reducing the difficulty of extracting the sheet pile, and reducing the risk of damage to the lifting equipment.

[0011] Preferably, the following steps are included before step S3:

[0012] The second cutting device is used to cut the exposed portion of the steel sheet pile in a second direction, where the angle between the second direction and the first direction is greater than zero.

[0013] Since the soil on the side of the sheet pile is excavated in step S2 of this scheme, the sections of the sheet pile will be partially exposed in the soil. This makes it relatively easy to cut these sections of the sheet pile into at least two smaller sections distributed along the height direction. This can further reduce the weight of a single section and the lateral friction between it and the soil, thereby further reducing the difficulty of extracting the sheet pile and improving the work efficiency.

[0014] Preferably, cutting steel sheet piles using a second cutting device includes the following steps:

[0015] A second cutting device is provided, which includes a wire saw main unit, a cutting rope, a fixed pulley, and a movable pulley; at least one fixed pulley is provided on each of the opposite sides of the sheet pile, and a movable pulley and the wire saw main unit are provided on the shore. The position of the movable pulley relative to the fixed pulley is adjustable; the cutting rope is connected to the wire saw main unit in sections by passing around the fixed pulley, the movable pulley, and the sheet pile.

[0016] Start the wire saw to cut the sheet pile segments along the second direction, and adjust the position of the movable pulley relative to the fixed pulley to keep the tension of the cutting rope within the specified working range until the sheet pile segments are cut along the second direction.

[0017] Since the sheet piles at the wharf face water on one side, at least one side of the exposed portion of the sheet piles will be underwater. Therefore, the deployment of the second cutting device is likely to involve a large amount of underwater work, which will increase the construction period, cost, and safety risks of the cutting operation. In order to reduce the amount of underwater work, this solution recommends using a wire saw as the second cutting device. Only the fixed pulley and cutting rope, which are simple in structure, lightweight, and easy to install, will be involved in underwater operations, while the wire saw main unit and movable pulley, which are complex in structure, heavy, and difficult to install, can be set up on land. This can significantly reduce the need for underwater operations in the deployment of the second cutting device, thereby reducing the construction period, cost, and safety risks of the cutting operation.

[0018] Preferably, when steel tie rods are connected between adjacent sections of two sheet piles, the following steps are included before step S3:

[0019] Use a third cutting device to cut the steel tie rod between the segments of two adjacent sheet piles.

[0020] The steel tie rod connects the sheet piles at both ends of the steel tie rod into a whole. If the whole structure is lifted without cutting the steel tie rod, the lifting capacity required to pull out the sheet piles will increase exponentially. Furthermore, the weight of the steel tie rod and the lateral friction between the steel tie rod and the soil will further increase the difficulty of pulling out the sheet piles. Therefore, this solution cuts the steel tie rod before pulling out the sheet piles, so that the sheet piles at both ends of the steel tie rod can be pulled out separately, reducing the lifting capacity and operational difficulty required for a single lifting operation.

[0021] Preferably, the following steps are included before step S2:

[0022] Use a negative pressure suction device to remove mud and sand from the cutting guide pile.

[0023] Because the side wall of the cutting guide pile has a guide groove, some mud and sand will enter the interior of the cutting guide pile when it is driven, which may interfere with the operation of the subsequent first cutting device. Therefore, this solution cleans the cutting guide pile before step S2 to prevent the mud and sand in the cutting guide pile from interfering with the subsequent cutting operation.

[0024] Preferably, before excavating the soil on the side of the sheet pile in step S2, the following steps are also included:

[0025] Connect the sheet piles to the breast wall structure that has not been removed.

[0026] In step S2, excavating the soil on the side of the sheet pile will reduce the soil's support for the sheet pile, which may lead to insufficient support and the sheet pile to topple over, thus causing a safety accident. Therefore, this plan connects the sheet pile to the breast wall structure that has not yet been demolished before excavating the soil on the side of the sheet pile, so as to ensure that the sheet pile will not topple over when excavating the soil on its side.

[0027] Preferably, in step S2, when excavating the soil on the side of the sheet pile, the soil on both sides of the sheet pile is excavated.

[0028] This solution can prevent the sheet pile from tipping over due to unbalanced forces on both sides.

[0029] Preferably, the first cutting device includes at least one of a saw cutting machine, abrasive wheel cutting machine, oxy-flame cutting machine, electric arc cutting machine, sandblasting cutting machine, wire saw, and laser cutting machine.

[0030] This plan recommends six specific forms of the first cutting device.

[0031] Preferably, in step S2, at least one of a grab dredger, a hydraulic sand pump, and an excavator is used to excavate the soil on the side of the sheet pile.

[0032] This plan recommends specific equipment for two of the excavation methods.

[0033] Preferably, in step S3, a crane vessel is used to pull the sections of the sheet piles out of the ground.

[0034] This plan recommends using a crane vessel to extract the sheet pile sections. This avoids driving heavy ground lifting equipment into the demolition site and interfering with the demolition work. Furthermore, since sheet piles are often very large in length, using a crane vessel to lift them on water also facilitates towing them, reducing transportation difficulties and preventing interference between the sheet piles and the ground or above-ground structures.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] This invention provides a method for removing existing sheet piles at a wharf. By inserting a cutting guide pile into the side of the sheet pile, a first cutting device can be guided to move underground along the cutting guide pile, thereby cutting the sheet pile into at least two smaller and lighter segments. At the same time, the soil on the side of the sheet pile is excavated to further reduce the lateral friction between the sheet pile segments and the soil, thereby reducing the lifting capacity required for each lifting operation, significantly reducing the difficulty of extracting the sheet pile, and reducing the risk of damage to the lifting equipment. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the plan layout of the sheet piles to be demolished in Example 1;

[0038] Figure 2 This is a schematic diagram of the plan layout of the working platform in a method for removing existing steel sheet piles at a wharf, as shown in Example 1.

[0039] Figure 3 This is a frontal sectional view of the sheet pile to be demolished in Example 1;

[0040] Figure 4 This is a front view schematic diagram of the cutting guide pile and working platform in a method for removing existing steel sheet piles at a wharf in Example 1;

[0041] Figure 5 This is a schematic diagram illustrating the principle of cutting the steel sheet piles using the guide pile in a method for removing existing steel sheet piles at a wharf, as described in Example 1.

[0042] Figure 6 This is a side view schematic diagram illustrating the working principle of the second cutting device in a method for removing existing steel sheet piles at a wharf in Embodiment 2.

[0043] Figure 7 This is a top view schematic diagram of the working principle of the second cutting device in a method for removing existing steel sheet piles at a wharf in Embodiment 2;

[0044] Figure 8 This is a side view schematic diagram illustrating the working principle of the third cutting device in a method for removing existing steel sheet piles at a wharf in Embodiment 3.

[0045] Figure 9 This is a front view schematic diagram of the working principle of the first cutting device in a method for removing existing steel sheet piles at a wharf, as described in Example 4. Figure 1 ;

[0046] Figure 10 This is a top view schematic diagram illustrating the working principle of the first cutting device in an existing steel sheet pile removal method for a wharf, as shown in Example 4. Figure 1 ;

[0047] Figure 11 yes Figure 9 A magnified schematic diagram of the local structure at point I;

[0048] Figure 12 This is a schematic diagram of the cross-sectional structure at the cutting guide pile in a method for removing existing steel sheet piles at a wharf in Example 4;

[0049] Figure 13 This is a schematic diagram of the working principle of the negative pressure suction device for a method of removing existing steel sheet piles at a wharf according to the present invention.

[0050] Figure 14 This is a front view schematic diagram of the working principle of the first cutting device in a method for removing existing steel sheet piles at a wharf, as described in Example 4. Figure 2 ;

[0051] Figure 15 This is a top view schematic diagram illustrating the working principle of the first cutting device in an existing steel sheet pile removal method for a wharf, as shown in Example 4. Figure 2 ;

[0052] Icons: 1-Sheet pile; 2-Steel tie rod; 3-Breast wall; 4-Soil; 5-Cutting guide pile; 6-First cutting device; 7-Second cutting device; 8-Winch; 9-Working platform; 10-Negative pressure suction device;

[0053] 51-Guide groove; 52-Guide strip; 61-Lifting lug; 62-Counterweight block; 63-Guide pulley; 71-Wire saw main unit; 72-Cutting rope; 73-Fixed pulley; 74-Moving pulley; 75-Rack; 76-Gear; 77-Gear seat; 101-Suction nozzle; 102-Compressed air delivery pipe; 103-Sand and mud delivery pipe. Detailed Implementation

[0054] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0055] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0056] Furthermore, the use of terms such as "horizontal," "vertical," "suspension," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspension," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0057] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0058] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0059] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0060] Example 1

[0061] This embodiment takes the demolition operation of a certain dock as an example, such as... Figure 1 and Figure 3The diagram shows the distribution of sheet piles 1 at the wharf, including circular sheet pile head sections, pipe-sheet composite pile transition sections, and grid sheet piles 1 arranged sequentially from the shore to the sea. Each cell of the grid sheet piles 1 is backfilled with sand, and the sheet piles 1 on both sides of the cell are connected by steel tie rods 2. Furthermore, the top surface of each sheet pile 1 is connected to a water-retaining breast wall 3. These sheet piles 1 are extremely large; for example, a single cell of the grid sheet pile 1 exceeds 27m in length and 20m or more in depth, making it impossible to directly pull them out as a whole using existing lifting equipment. Therefore, this embodiment proposes a method such as... Figures 1 to 5 The method for removing existing steel sheet piles at the wharf shown includes the following steps:

[0062] S1, such as Figure 4 As shown, a crawler crane and a hydraulic vibratory hammer are used to insert and clamp a cutting guide pile 5 on at least one side of the sheet pile 1 to be demolished; as shown Figure 12 As shown, the cutting guide pile 5 is a hollow columnar component. The side of the cutting guide pile 5 facing the sheet pile 1 is provided with a guide groove 51. When inserting the cutting guide pile 5, the angle between the axis of the cutting guide pile 5 and the horizontal should be greater than zero, preferably 90°. However, it can also be other angles, such as 85° or 95°, depending on the actual situation and cutting requirements.

[0063] The specific parameters of the cutting guide post 5, such as the inner diameter and the width of the guide groove 51, should match the first cutting device 6 to be installed later. For example, the inner diameter of the cutting guide post 5 should be sufficient to accommodate the first cutting device 6; the width of the guide groove 51 should be greater than the cutting part of the first cutting device 6, such as the width of the saw blade or grinding wheel.

[0064] The number and distribution of the cutting guide piles 5 are determined according to the actual cutting requirements. For example, if the sheet pile 1 is to be cut into n segments distributed along the length of the sheet pile 1, at least n-1 sets of cutting guide piles 5 should be set at intervals along the length of the sheet pile 1 to generate n-1 cutting seams at the corresponding positions of the sheet pile 1. When driving the cutting guide piles 5, care should be taken to avoid the steel tie rod 2.

[0065] The number of cutting guide piles 5 in each group of cutting guide piles 5 depends on the cutting method of the first cutting device 6. If the first cutting device 6 includes a saw cutting machine, abrasive wheel cutting machine, oxy-flame cutting machine, electric arc cutting machine, sandblasting cutting machine, laser cutting machine, or other cutting devices that can cut the sheet pile 1 from one side, then each group of cutting guide piles 5 can contain only one cutting guide pile 5, as long as the cutting parts of each cutting device, such as saw blade, abrasive wheel, and cutting head, can cut the sheet pile 1 through the guide groove 51 respectively. However, if the first cutting device 6 includes a wire saw or other cutting device that needs to cut the sheet pile 1 from both sides simultaneously, then each group of cutting guide piles 5 contains at least two cutting guide piles 5 distributed on both sides of the sheet pile 1.

[0066] In an optional embodiment, the guide groove 51 can be set along the entire length of the cutting guide post 5, thereby maximizing the cutting range of the cutting rope 72 while keeping the length of the cutting guide post 5 constant.

[0067] In an optional embodiment, after the cutting guide pile 5 is driven in, a negative pressure suction device 10 can be used to remove the mud and sand inside the cutting guide pile 5. For example... Figure 13 The diagram shows a specific negative pressure suction device 10, which includes a suction nozzle 101, a compressed air delivery pipe 102, and a mud and sand delivery pipe 103. The bottom opening of the suction nozzle 101 is used to suck up mud and sand, and the top of the suction nozzle 101 is connected to one end of the mud and sand delivery pipe 103. The other end of the mud and sand delivery pipe 103 extends to the outside of the cutting guide pile 5 and is used to spray out mud and sand. One end of the air delivery pipe extends into the mud and sand delivery pipe 103 and the outlet faces upward. The other end of the air delivery pipe is connected to an air compressor to deliver compressed air into the air delivery pipe, which can drive the air in the mud and sand delivery pipe 103 to move upward, thereby forming a negative pressure in the mud and sand delivery pipe 103, so that mud, sand and other debris can be sucked in by the suction nozzle 101 and transported to the outside of the cutting guide pile 5 through the mud and sand delivery pipe 103.

[0068] In an optional embodiment, both the mud and sand conveying pipe 103 and the air conveying pipe may include steel wire hoses.

[0069] In an optional embodiment, since a first cutting device 6 needs to be placed in the cutting guide pile 5 and the first cutting device 6 needs to be controlled to move along the cutting guide pile 5 and cut the sheet piles 1 along the way, after the cutting guide pile 5 is driven, it can also be done as follows: Figure 2 and Figure 4 As shown, a working platform 9 is set above the cutting guide pile 5. The working platform 9 has a through hole at the position corresponding to the steel sheet pile 1, which allows construction personnel to easily insert the first cutting device 6 into the cutting guide pile 5 and control the first cutting device 6 through the through hole.

[0070] In optional embodiments, depending on the requirements of the cutting position or the cutting form of the first cutting device 6, such as Figure 2 As shown, some of the cutting guide piles 5 are close together. For these cutting guide piles 5, multiple cutting guide piles 5 can share one working platform 9 to improve the utilization rate of the working platform 9.

[0071] S2. A first cutting device 6 is installed inside the cutting guide pile 5. The position of the first cutting device 6 along the axial direction of the cutting guide pile 5 is adjustable. The first cutting device 6 is moved along the axial direction of the cutting guide pile 5 so that the first cutting device 6 cuts the steel sheet pile 1 through the guide groove 51 and cuts the steel sheet pile 1 into at least two segments along the first direction, which is parallel to the axial direction of the cutting guide pile 5. The soil 4 on the side of the steel sheet pile 1 is excavated to the specified elevation.

[0072] In an optional embodiment, the first cutting device 6 includes at least one of a saw cutting machine, a grinding wheel cutting machine, an oxy-flame cutting machine, an electric arc cutting machine, a sandblasting cutting machine, a wire saw, and a laser cutting machine, and the cutting part of the first cutting device 6, such as a saw blade, a grinding wheel, and a cutting head, points to the sheet pile 1 through a guide groove 51.

[0073] In optional embodiments, the adjustable position of the first cutting device 6 within the cutting guide pile 5 includes, but is not limited to: providing a slide rail slider mechanism between the first cutting device 6 and the cutting guide pile 5, with the length direction of the slide rail along the axial direction of the cutting guide pile 5; providing a gear and rack mechanism between the first cutting device 6 and the cutting guide pile 5; directly making the outer wall of the first cutting device 6 clearance-fitted with the inner wall of the cutting guide pile 5; and providing a traveling device, such as a traveling wheel, track, or traveling foot, on the first cutting device 6.

[0074] In an optional embodiment, the first cutting device 6 is provided with a lifting lug 61, and the working platform 9 is provided with a winch 8. The cable of the winch 8 is connected to the lifting lug 61, so that the first cutting device 6 can be pulled within the cutting guide pile 5 by the winch 8 raising and lowering the cable.

[0075] In an optional embodiment, a guide strip 52 is provided on one of the cutting guide post 5 and the first cutting device 6, and a guide groove is provided on the other of the cutting guide post 5 and the first cutting device 6. The length direction of both the guide strip 52 and the guide groove is along the axial direction of the cutting guide post 5, and the guide strip 52 and the guide groove are slidably connected. For example Figure 12 As shown, the cutting guide post 5 has a round steel bar inside as a guide bar 52, and the first cutting device 6 has a guide groove of a corresponding shape, so that the movement of the first cutting device 6 can be guided by the mutual limiting of the guide groove and the guide bar 52; and two or more guide bars 52 can be provided, and they are distributed in a centrally symmetrical or axially symmetrical manner relative to the axis of the cutting guide post 5, so as to provide a more uniform guiding effect.

[0076] In an optional embodiment, since the first cutting device 6 disturbs the surrounding soil 4 when cutting, sand, gravel, cutting fragments and other debris will enter the cutting guide pile 5 from the guide channel 51. If the amount of debris is too large, it may cause the cutting guide pile 5 to be blocked. Therefore, a negative pressure suction device 10 can also be connected to the first cutting device 6 to transport the mud and sand in the cutting guide pile 5 to the outside of the cutting guide pile 5, prevent the cutting guide pile 5 from being blocked, and ensure that the first cutting device 6 can operate smoothly in the cutting guide pile 5.

[0077] In an optional embodiment, the suction nozzle 101 is located at the bottom of the first cutting device 6, thereby clearing the mud and sand below the first cutting device 6 before the first cutting device 6 moves downward, preventing the first cutting device 6 from getting stuck in the cutting guide post 5 due to mud and sand.

[0078] In an optional implementation, step S2 involves using at least one of a grab dredger, an excavator, or a hydraulic sand pump to excavate the soil 4 on the side of the sheet pile 1. For example, a grab dredger is used to excavate the soil 4 on the water-facing side of the sheet pile 1, while an excavator and a hydraulic sand pump are used to extract the backfill sand from the compartments of the grid-shaped sheet pile 1.

[0079] In an optional implementation, when excavating the soil 4 on the side of the sheet pile 1 in step S2, excavation is carried out on both sides of the sheet pile 1. The specific excavation depth depends on the lifting capacity of the lifting equipment and the stress condition of the sheet pile 1. For example, if the lifting capacity of the lifting equipment is insufficient, the excavation depth can be increased; if the support forces on both sides of the sheet pile 1 are unbalanced, the excavation depth of the soil 4 on the side with higher support force can be increased. Correspondingly, the excavation of the soil 4 in two adjacent compartments of the lattice sheet pile 1 can be carried out simultaneously to avoid excessive height differences in the soil 4 on both sides of the sheet pile 1, which could lead to the sheet pile 1 tipping over.

[0080] In an optional embodiment, the sheet pile 1 can be connected to the undisturbed breast wall 3 structure before excavating the soil 4 on the side of the sheet pile 1. For example, round steel is installed on the undisturbed breast wall 3, holes are drilled in the sheet pile 1, and a lifting chain is installed between the drilled hole and the round steel.

[0081] After completing step S2, the work platform 9 can be dismantled, or a crane can be used to move the work platform 9 to the next cutting station.

[0082] S3. Use lifting equipment to pull the sections of sheet pile 1 out of the ground one by one.

[0083] In an alternative implementation, a crane boat with a vibratory hammer is used to pull the sections of the sheet pile 1 out of the ground one by one; if they cannot be pulled out, the height of the soil 4 on the side of the sheet pile 1 can be reduced, or the sections of the sheet pile 1 can be cut again.

[0084] In an optional implementation, the crane vessel lifts the sections of the sheet pile 1 and places them on the deck of another vessel, which then transports the sections to a designated location.

[0085] It is important to note that Figure 2 This is only used to demonstrate the installation positions of multiple working platforms 9 and their corresponding cutting guide piles 5. However, these working platforms 9 do not necessarily need to be set up and perform cutting operations simultaneously. They can also be set up and perform cutting operations in batches as the work progresses. Figures 1 to 5 and subsequent Figures 6 to 8 In the diagram, the direction indicated by arrow Z represents the height direction, while arrows X and Y represent two mutually perpendicular directions parallel to the horizontal plane.

[0086] Example 2

[0087] like Figures 6 to 7 As shown, a method for removing existing steel sheet piles at a wharf, based on Example 1, includes the following steps before step S3:

[0088] The second cutting device 7 is used to cut the exposed soil 4 of the steel sheet pile 1 in the second direction. The angle between the second direction and the first direction is greater than zero, preferably 90°, that is, the second direction is horizontal. However, it can also be other angles, such as 85° or 95°, depending on the actual situation and cutting requirements.

[0089] The second cutting device 7 may include at least one of a saw cutting machine, abrasive wheel cutting machine, oxy-flame cutting machine, electric arc cutting machine, sandblasting cutting machine, wire saw, and laser cutting machine; when in use, a guide mechanism along the second direction can be set underwater to guide the second cutting device 7, or underwater manual operation can be carried out by divers.

[0090] In an optional embodiment, cutting the sheet pile 1 using the second cutting device 7 includes the following steps:

[0091] A second cutting device 7 is provided, which includes a wire saw main unit 71, a cutting rope 72, a fixed pulley 73, and a movable pulley 74. At least one fixed pulley 73 is provided on each of the opposite sides of one end of the sheet pile 1 along its length. The movable pulley 74 and the wire saw main unit 71 are provided on the shore, i.e. above the water surface, such as on the working platform 9 or on the breast wall 3 that has not been removed. The position of the movable pulley 74 relative to the fixed pulley 73 is adjustable. The cutting rope 72 is connected to the wire saw main unit 71 in sections, passing around the fixed pulley 73, the movable pulley 74, and the sheet pile 1.

[0092] Start the wire saw host 71 to make the cutting rope 72 cut the segments of the steel sheet pile 1 along the second direction, and adjust the position of the movable pulley 74 relative to the fixed pulley 73 to keep the tension of the cutting rope 72 within the specified working range until the segments of the steel sheet pile 1 are cut along the second direction.

[0093] It is important to note that Figure 7 The position of the fixed pulley 73 was adjusted to facilitate the display of the fixed pulley 73 on the sheet pile 1 and to prevent it from being obscured by the work platform.

[0094] Example 3

[0095] like Figure 8As shown, a method for removing existing sheet piles at a wharf, based on Embodiments 1 and 2, further includes the following steps before step S3 when steel tie rods 2 connect the segments of two adjacent sheet piles 1, for example, for the steel tie rods 2 between the sheet piles 1 on both sides of a grid-shaped sheet pile 1:

[0096] Use the third cutting device to cut the steel tie rod 2 between the segments of two adjacent sheet piles 1.

[0097] The third cutting device may include at least one of a saw cutting machine, abrasive wheel cutting machine, oxy-flame cutting machine, electric arc cutting machine, sandblasting cutting machine, wire saw, and laser cutting machine. In use, a guide mechanism along the second direction can be installed underwater to guide the second cutting device 7, or underwater manual operation by divers can be employed.

[0098] In an optional embodiment, cutting the sheet pile 1 using a third cutting device includes the following steps:

[0099] Use an excavator and / or a hydraulic sand pump to lower the filling level in the grid-shaped sheet pile 1 compartment, exposing the parts of the steel tie rod 2 to be cut, such as the connection between the steel tie rod 2 and the sheet pile 1.

[0100] A wire saw host 71 and corresponding fixed pulleys 73 and movable pulleys 74 are set up on the shore, so that the cutting rope 72 passes around the fixed pulleys 73, movable pulleys 74 and steel rods 2 and is connected to the wire saw host 71; and the cutting rope 72 can pass around multiple steel rods 2 at one time to cut multiple steel rods 2 at one time; divers can be used when winding the cutting rope 72.

[0101] Start the wire saw main unit 71 to make the cutting rope 72 cut the steel tie rod 2, and adjust the position of the movable pulley 74 relative to the fixed pulley 73 to keep the tension of the cutting rope 72 within the specified working range until the steel tie rod 2 is cut.

[0102] Example 4

[0103] like Figures 9 to 15 As shown, a method for removing existing steel sheet piles at a wharf, based on embodiments 1 to 3, includes a first cutting device 6 comprising a guide pulley 63 for winding a cutting rope 72. Correspondingly, at least one cutting guide pile 5 is distributed on both sides of the steel sheet pile 1. The working platform 9 is equipped with a movable pulley 74, a fixed pulley 73, and a wire saw host 71. The wire saw host 71 is connected to the cutting rope 72, which passes around the guide pulley 63, the fixed pulley 73, and the movable pulley 74. The cutting rope 72 passes through a guide groove 51 between two adjacent cutting guide piles 5 and is used to cut the steel sheet pile 1 between two adjacent cutting guide piles 5.

[0104] In this embodiment, a wire saw is used to cut the steel sheet pile 1. Compared with other methods, such as saw cutting machine or abrasive wheel cutting machine, this embodiment can set the power of the wire saw, i.e. the wire saw host 71, on the working platform 9, and only the guide pulley 63 needs to be set in the cutting guide pile 5. Therefore, the structural complexity and size of the first cutting device 6 and the cutting guide pile 5 can be greatly reduced.

[0105] It is important to note that, in Figures 9 to 10 The image shows a single working platform with nine wire saw main units 71 and corresponding fixed pulleys 73 and movable pulleys 74. Figure 9 The different configurations of the first cutting settings within the guide piles 5 on the left and right sides are only to demonstrate the cases of connecting the negative pressure suction device 10 and not connecting the negative pressure suction device 10. In actual use, the negative pressure suction device 10 can be installed on both sides, or neither side can be equipped with the negative pressure suction device 10. Figures 14 to 15 The image shows a single work platform 9 equipped with two sets of wire saw main units 71 and corresponding fixed pulleys 73 and movable pulleys 74;

[0106] In the above embodiments, taking the case including two cutting guide piles 5 as an example, such as... Figure 9 and Figure 10 As shown, the cutting rope 72 starts from the motor outlet turntable on the left side of the wire saw host 71, and after being turned by a set of fixed pulleys 73, it enters the interior of the left cutting guide pile 5 through the top opening of the left cutting guide pile 5. Then it goes around the guide pulley 63 inside the left cutting guide pile 5, and then passes out through the guide slot 51 of the left cutting guide pile 5. It then goes into the right cutting guide pile 5 through the guide slot 51 of the right cutting guide pile 5 and goes around the corresponding guide pulley 63. Then it goes out through the top opening of the right cutting guide pile 5, and passes around a set of fixed pulleys 73, a set of movable pulleys 74, and a set of fixed pulleys 73 in sequence, before returning to the motor inlet turntable on the right side of the wire saw host 71, forming a rotation cycle of the cutting rope 72. It should be noted that the winding sequence of the cutting rope 72 described here is only for the convenience of understanding the path of the cutting rope 72, and does not mean that the cutting rope 72 must pass through each structure in the same order. Moreover, the arrangement and number of fixed pulleys 73 and movable pulleys 74 can be changed according to the actual site requirements.

[0107] In the above embodiments, for cases involving three or more cutting guide piles 5, two or more guide slots 51 need to be set on some of the pipe piles. Taking the case involving three cutting guide piles 5 arranged side by side as an example, the cutting guide piles 5 on the left and right sides need to have a guide slot 51 set on their right and left sides respectively, while the cutting guide pile 5 in the middle needs to have guide slots 51 set on both its left and right sides. In this way, the cutting rope 72 can be set between the right cutting guide pile 5 and the middle cutting guide pile 5 after being erected on the left cutting guide pile 5 and the middle cutting guide pile 5.

[0108] In an optional embodiment, the cutting rope 72 includes at least one of a diamond wire saw, a shaped stone cutting rope 72 saw, and a combination cutting rope 72 saw.

[0109] In an optional embodiment, the work platform 9 is further provided with a rack 75 and a gear seat 77. The rack 75 is fixed to the work platform 9. The bottom of the gear seat 77 is provided with a traveling wheel, which allows it to move on the work platform 9 along the direction of the rack 75. A gear 76 and a movable pulley 74 are rotatably connected to the gear seat 77. The gear 76 meshes with the rack 75, and the gear 76 is also connected to a drive motor, such as a stepper motor or a servo motor. The drive motor can drive the gear 76 to rotate, thereby causing the gear seat 77 to move along the length direction of the rack 75, and thus causing the movable pulley 74 to move closer to or away from the fixed pulley 73.

[0110] The counterweight 62 increases the cutting force of the cutting rope 72, thereby enabling the cutting rope 72 to cut the sheet pile 1 more efficiently and quickly.

[0111] In an optional embodiment, a counterweight 62 is detachably connected to the first cutting device 6. At least two counterweights 62 are connected to the bottom of the first cutting device 6 by threaded rods and nuts. The number of counterweights 62 can be increased or decreased according to actual usage needs, thereby changing the total weight of the counterweights 62 to adapt to different cutting requirements.

[0112] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for removing existing steel sheet piles at a wharf, characterized in that, It includes the following steps: S1. Insert at least one cutting guide pile (5) on both sides of the sheet pile (1) to be demolished. The angle between the axis of the cutting guide pile (5) and the horizontal is greater than zero. The cutting guide pile (5) is hollow inside. A guide groove (51) is provided on the side of the cutting guide pile (5) facing the sheet pile (1). S2. A first cutting device (6) is installed inside the cutting guide post (5). The position of the first cutting device (6) along the axial direction of the cutting guide post (5) is adjustable. The first cutting device (6) includes a guide pulley (63) for winding the cutting rope (72). The cutting rope (72) passes through the guide groove (51) between two adjacent cutting guide posts (5). A negative pressure suction device (10) is connected to the first cutting device (6). The suction nozzle (101) of the negative pressure suction device (10) is located at... At the bottom of the first cutting device (6), the mud and sand in the cutting guide pile (5) are transported to the outside of the cutting guide pile (5); the first cutting device (6) is moved along the axial direction of the cutting guide pile (5) so that the first cutting device (6) cuts the steel sheet pile (1) through the guide groove (51) and cuts the steel sheet pile (1) into at least two segments along the first direction, the first direction being parallel to the axial direction of the cutting guide pile (5); the soil (4) on the side of the steel sheet pile (1) is excavated to the specified elevation; S3. Use lifting equipment to pull out the sections of the sheet pile (1) from the ground.

2. The method for removing existing steel sheet piles at a wharf according to claim 1, characterized in that, The following steps precede step S3: The second cutting device (7) is used to cut the exposed soil (4) portion of the sheet pile (1) along the second direction, where the angle between the second direction and the first direction is greater than zero.

3. The method for removing existing steel sheet piles at a wharf according to claim 2, characterized in that, Cutting the sheet pile (1) using the second cutting device (7) includes the following steps: The second cutting device (7) is provided, which includes a wire saw main unit (71), a cutting rope (72), a fixed pulley (73), and a movable pulley (74). At least one fixed pulley (73) is provided on each of the opposite sides of the sheet pile (1), and the movable pulley (74) and the wire saw main unit (71) are provided on the shore. The position of the movable pulley (74) relative to the fixed pulley (73) is adjustable. The cutting rope (72) passes around the fixed pulley (73), the movable pulley (74), and the sheet pile (1) and is connected to the wire saw main unit (71) in sections. Start the wire saw host (71) so that the cutting rope (72) cuts the steel sheet pile (1) into segments along the second direction, and adjust the position of the movable pulley (74) relative to the fixed pulley (73) to keep the tension of the cutting rope (72) within the specified working range until the steel sheet pile (1) is cut along the second direction.

4. The method for removing existing steel sheet piles at a wharf according to claim 1, characterized in that, When steel tie rods (2) are connected between the segments of two adjacent sheet piles (1), the following steps are included before step S3: The steel tie rod (2) between the segments of two adjacent sheet piles (1) is cut using a third cutting device.

5. A method for removing existing steel sheet piles at a wharf according to any one of claims 1 to 4, characterized in that, Before excavating the soil (4) on the side of the sheet pile (1) in step S2, the following steps are also included: The sheet pile (1) is connected to the unremoved breast wall (3) structure.

6. A method for removing existing steel sheet piles at a wharf according to any one of claims 1 to 4, characterized in that, In step S2, when excavating the soil (4) on the side of the sheet pile (1), the soil (4) on both sides of the sheet pile (1) is excavated.

7. A method for removing existing steel sheet piles at a wharf according to any one of claims 1 to 4, characterized in that, In step S2, at least one of a grab dredger, an excavator, or a hydraulic sand pump is used to excavate the soil (4) on the side of the sheet pile (1).

8. A method for removing existing steel sheet piles at a wharf according to any one of claims 1 to 4, characterized in that, In step S3, a crane vessel is used to pull the sections of the sheet pile (1) out of the ground.

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