Underwater steel pipe pile dismantling method

Abstract

The invention relates to the technical field of underwater cutting, and provides an underwater steel pipe pile dismantling method which comprises the steps that the cutting position of a to-be-dismantled steel pipe pile is determined; an operation machine is connected to the top of the to-be-dismantled steel pipe pile; cutting the cutting position based on an oxygen-arc cutting principle to obtain a cut steel pipe; and the cut steel pipe is hoisted out of the water surface through the operation machine. According to the method for dismantling the underwater steel pipe pile, oxygen and the to-be-dismantled steel pipe pile generate chemical reaction heat according to the oxygen-arc cutting principle, the to-be-dismantled steel pipe pile is heated and melted, molten metal and oxidized slag in a cutting seam are blown away by means of the impulsive force of oxygen flow, and therefore cutting of the to-be-dismantled steel pipe pile is completed; and in the cutting process, an operation machine is kept in a stress state, and rope clamping or other safety accidents caused by sudden overturning in the steel pipe pile cutting process are avoided, so that the steel pipe pile dismantling safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater cutting, and particularly to a method for removing underwater steel pipe piles. Background Art

[0002] In the field of bridge construction and maintenance, especially in the treatment of underwater structures, steel pipe piles, as a common foundation construction material, their installation and removal work has always been one of the key links in engineering technology. With the rapid development of social economy and the acceleration of urbanization, the demand for the transformation and renewal of old bridge facilities is increasing day by day, which requires continuous innovation and development in bridge construction and maintenance technologies. In this context, the efficient and safe extraction technology of steel pipe piles, especially underwater steel pipe piles, has become the focus of attention in the engineering field. Traditional methods for removing steel pipe piles mainly rely on mechanical excavation, blasting and other means. Among them, mechanical excavation is suitable for the treatment of shallow pile foundations, but it faces many limitations in the water environment; although the blasting method can solve the removal problem to a certain extent, its impact on the surrounding environment is relatively large. Especially in urban areas, factors such as noise pollution and vibration risk limit its application scope; In the prior art, the vibratory hammer technology has been widely used in the removal of underwater steel pipe piles due to its unique advantages. The vibratory hammer uses the principle of high-frequency vibration to reduce the friction between the steel pipe pile and the surrounding soil, so as to achieve the effect of easy removal.

[0003] However, although the vibratory hammer technology has shown excellent effects in many cases, it is still unable to cope with the removal of steel pipe piles in some special cases. For example, for those steel pipe piles that are tightly combined with the soil due to long-term immersion in water, or are difficult to be removed by vibration due to corrosion, deformation, etc., the effective removal of the steel pipe piles cannot be achieved. Summary of the Invention

[0004] The present invention provides a method for removing underwater steel pipe piles to solve the defect in the prior art that the effective removal of steel pipe piles cannot be achieved.

[0005] The present invention provides a method for removing underwater steel pipe piles, including: Determine the cutting position of the steel pipe pile to be removed; Connect the working machine to the top of the steel pipe pile to be removed; wherein, the working machine is located above the water surface; Cut the cutting position based on the oxygen-arc cutting principle to obtain the cut steel pipe after cutting; wherein, during the cutting process, the working machine is in a stressed state; Lift the cut steel pipe out of the transportation equipment above the water surface through the working machine.

[0006] According to an underwater steel pipe pile demolition method provided by the present invention, the cutting position is cut based on the oxygen-arc cutting principle, including: Based on the high temperature generated by the underwater electric arc, chemical reaction heat is generated between oxygen and the steel pipe pile to be demolished, so as to heat and melt the cutting position; Based on the impact force of the oxygen flow, the molten metal and oxidation slag generated at the cutting position are blown away to form a cutting seam at the cutting position.

[0007] According to an underwater steel pipe pile demolition method provided by the present invention, during the cutting process of the cutting position based on the oxygen-arc cutting principle, a preset cutting angle is provided between the cutting member and the steel pipe pile to be demolished.

[0008] According to an underwater steel pipe pile demolition method provided by the present invention, when connecting the working machine to the top of the steel pipe pile to be demolished, it includes: Apply a lifting hole at the top of the steel pipe pile to be demolished; Connect the boom of the working machine to the lifting hole.

[0009] According to an underwater steel pipe pile demolition method provided by the present invention, the distance between the lifting hole and the top end of the steel pipe pile to be demolished is greater than or equal to 8 cm.

[0010] According to an underwater steel pipe pile demolition method provided by the present invention, the method further includes: Cutting the cutting position based on a wire saw mechanism; wherein, the wire saw mechanism includes a beaded wire and a driving component, and the beaded wire is wound around the driving component and the cutting position of the steel pipe pile to be demolished.

[0011] According to an underwater steel pipe pile demolition method provided by the present invention, the driving component includes a driving member, a driven wheel, a driving wheel connected to the driving member, and a transmission member cooperatively connected to the driven wheel and the driving wheel; The beaded wire is cooperatively connected to the driven wheel and the driving wheel.

[0012] According to an underwater steel pipe pile demolition method provided by the present invention, the wire saw mechanism further includes a first guiding member for the movement of the beaded wire.

[0013] According to an underwater steel pipe pile demolition method provided by the present invention, determining the cutting position of the steel pipe pile to be demolished includes: Determine the riverbed elevation of the area of the steel pipe pile to be demolished; Based on the riverbed elevation, install a cutting elevation positioning member at the mud surface position in the area of the steel pipe pile to be demolished; Determine the cutting position based on the cutting elevation positioning member.

[0014] According to a method for removing an underwater steel pipe pile provided by the present invention, after cutting the cutting position based on the oxygen-arc cutting principle, the method further includes: Obtaining cutting environment parameters; the cutting environment parameters include cutting flame and / or slag flow direction; Based on the cutting environment parameters, determining that the cutting position is penetrated.

[0015] The method for removing an underwater steel pipe pile provided by the present invention uses the oxygen-arc cutting principle to cause oxygen to react chemically with the steel pipe pile to be removed to generate heat, heat and melt the steel pipe pile to be removed, and blow out the molten metal and oxidized slag in the cutting seam by means of the impact force of the oxygen flow, thereby completing the cutting of the steel pipe pile to be removed; and during the cutting process, the operating machinery is kept in a stressed state to avoid rope jamming or other safety accidents caused by the sudden overturning of the steel pipe pile during cutting, thereby improving the safety of removing the steel pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is one of the flow schematic diagrams of the method for removing an underwater steel pipe pile provided by the present invention.

[0018] Figure 2 is another flow schematic diagram of the method for removing an underwater steel pipe pile provided by the present invention.

[0019] Figure 3 is the structural schematic diagram of the underwater oxygen-arc cutting mechanism provided by the present invention.

[0020] Figure 4 is one of the structural schematic diagrams of the cutting assembly provided by the present invention.

[0021] Figure 5 is another structural schematic diagram of the cutting assembly provided by the present invention.

[0022] Figure 6 is one of the structural schematic diagrams of the cutting piece provided by the present invention.

[0023] Figure 7 is another structural schematic diagram of the cutting piece provided by the present invention.

[0024] Figure 8 is the third flow schematic diagram of the method for removing an underwater steel pipe pile provided by the present invention.

[0025] Figure 9 This is a schematic structural diagram of the wire saw mechanism provided by the present invention.

[0026] Reference numerals: 110, oxygen cylinder; 120, oxygen pipeline; 130, pressure reducer; 210, cutting cabinet; 220, cutting member; 221, pipe body; 222, cutting wire; 223, coating; 224, waterproof layer; 230, second guiding member; 310, power supply; 320, power-off control member; 330, cable; 400, steel pipe pile to be demolished; 510, bead wire; 520, driving component; 521, driven wheel; 522, driving wheel; 523, transmission member; 530, first guiding member. Detailed implementation manners

[0027] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of 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 operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0032] The following combines Figures 1-9 to describe the method for removing underwater steel pipe piles of the present invention.

[0033] An embodiment of the first aspect of the present invention proposes a method for removing underwater steel pipe piles, as Figure 1 shown, the removal method includes the following steps: Step 10: Determine the cutting position of the steel pipe pile 400 to be removed.

[0034] Step 20: Connect the working machine to the top of the steel pipe pile 400 to be removed; wherein, the working machine is above the water surface.

[0035] Step 30: Cut the cutting position based on the oxygen-arc cutting principle to obtain the cut steel pipe after cutting; wherein, the working machine is in a stressed state during the cutting process.

[0036] Step 40: Lift the cut steel pipe out of the transportation equipment above the water surface through the working machine.

[0037] It can be understood that first determine the cutting position of the underwater steel pipe pile 400 to be removed, cut the cutting position based on the oxygen-arc cutting principle. During the cutting process, the working machine is connected to the top of the steel pipe pile 400 to be removed, and the working machine should maintain a stressed state to avoid rope jamming or other safety accidents caused by the sudden overturning of the steel pipe pile during the cutting process.

[0038] It is understandable that the oxygen-arc cutting principle utilizes the high temperature generated by the underwater electric arc and the chemical reaction heat generated by oxygen and the metal elements of the steel pipe pile 400 to be demolished, heats and melts the steel pipe pile 400 to be demolished, and blows out the molten metal and oxidized slag in the cutting seam by means of the impact force of the oxygen flow, thereby forming a cutting seam; and as the underwater electric arc continuously moves and oxygen is continuously supplied, the cutting position of the steel pipe pile 400 to be demolished obtains the required cutting length, achieving the purpose of cutting off the steel pipe pile 400 to be demolished, so as to complete the cutting of the steel pipe pile 400 to be demolished.

[0039] The underwater steel pipe pile demolition method provided by the embodiment of the present invention utilizes the oxygen-arc cutting principle to make oxygen generate chemical reaction heat with the steel pipe pile 400 to be demolished, heats and melts the steel pipe pile 400 to be demolished, and blows out the molten metal and oxidized slag in the cutting seam by means of the impact force of the oxygen flow, thereby completing the cutting of the steel pipe pile 400 to be demolished; and during the cutting process, the operating machinery is kept in a stressed state to avoid sudden overturning of the steel pipe pile during cutting and causing rope jamming or other safety accidents, thereby improving the safety of steel pipe pile demolition.

[0040] In an embodiment of the present invention, step 10 may include the following contents: Determine the riverbed elevation of the area of the steel pipe pile 400 to be demolished; based on the riverbed elevation, install a cutting elevation positioning member at the mud surface position in the area of the steel pipe pile 400 to be demolished; determine the cutting position based on the cutting elevation positioning member.

[0041] It is understandable that check the situation of the steel pipe pile position, explore and feel the riverbed elevation of the construction area around the steel pipe pile position, and install a cutting elevation positioning hoop at the mud surface position in the area of the steel pipe pile 400 to be demolished. The cutting elevation positioning hoop is attached to the mud surface, and the cutting position is determined based on the cutting elevation positioning member.

[0042] Exemplarily, the cutting elevation positioning member may adopt a positioning hoop, and the steel pipe pile 400 to be demolished is cut multiple times from top to bottom, thereby determining multiple cutting positions arranged from top to bottom of the steel pipe pile 400 to be demolished, and cutting at multiple cutting positions in sequence from top to bottom. It should be noted here that after the cutting at the uppermost cutting position is completed, the cut steel pipe after cutting is hoisted out of the transportation equipment on the water surface by the operating machinery, and then the operating machinery is connected to the top of the remaining steel pipe pile 400 to be demolished after cutting, and cutting is carried out again. Repeat this way to complete the cutting at multiple cutting positions from top to bottom, and further complete the underwater steel pipe pile demolition.

[0043] In an embodiment of the present invention, step 20 may include the following contents: Apply a lifting hole at the top of the steel pipe pile 400 to be demolished, and connect the boom of the operating machinery to the lifting hole.

[0044] It is understandable that before each cutting, a lifting hole is applied to the top of the steel pipe pile 400 to be demolished. The lifting arm of the working machine is connected to the lifting hole, and during the cutting process, the working machine remains in a stressed state.

[0045] In this embodiment, the working machine uses a crawler crane. Two symmetrically arranged lifting holes are opened at the top of the steel pipe pile 400 to be demolished. The aperture size of the lifting hole should be such that a 10t (ton) shackle can smoothly penetrate. It should be noted that the two-point lifting method is used during lifting, which can meet the safety requirements.

[0046] Optionally, the distance between the lifting hole and the top end of the steel pipe pile 400 to be demolished is greater than or equal to 8 cm to ensure safe lifting.

[0047] In an embodiment of the present invention, as Figure 2 shown, step 30 may include the following steps: Step 31: Based on the high temperature generated by the underwater electric arc, make oxygen react chemically with the steel pipe pile 400 to be demolished to generate chemical reaction heat, so as to heat and melt the cutting position.

[0048] Step 32: Based on the impact force of the oxygen flow, blow away the molten metal and oxidized slag generated at the cutting position to form a cut at the cutting position.

[0049] Optionally, in step 30, the cutting position is cut based on the oxygen-arc cutting principle, specifically based on an underwater oxygen-arc cutting mechanism.

[0050] As Figure 3 shown, the underwater oxygen-arc cutting mechanism includes a gas supply component, a cutting component, and an arc ignition component.

[0051] The gas supply component includes an oxygen cylinder 110 and an oxygen pipeline 120. The oxygen cylinder 110 is located above the water, and the first end of the oxygen pipeline 120 is connected to the oxygen cylinder 110.

[0052] The cutting component includes a cutting cabinet 210 located underwater and a cutting piece 220. The cutting cabinet 210 is connected to the second end of the oxygen pipeline 120. The cutting piece 220 is connected to the cutting cabinet 210, and there is a preset cutting angle between the cutting piece 220 and the steel pipe pile 400 to be demolished.

[0053] The arc ignition component includes a power supply 310 located above the water and a power-off control part 320. The power supply 310 is connected to the cutting cabinet 210 through the power-off control part 320, and the power supply 310 is connected to the steel pipe pile 400 to be demolished. The function of the arc ignition component is to ignite an arc for the cutting piece 220. After the cutting piece 220 burns stably, the power-off control part 320 is controlled to close, thereby disconnecting the power supply 310.

[0054] It can be understood that one end of the power supply 310 is connected to the cutting cabinet 210 through a power-off control member 320, and the other end of the power supply 310 is connected to the steel pipe pile 400 to be demolished. At the same time, the cutting cabinet 210 is connected to the oxygen cylinder 110 through an oxygen pipeline 120, and oxygen is sent from the oxygen cylinder 110 to the cutting cabinet 210. The power-off control member 320 is in an open state, and an arc is ignited by the contact between the end of the cutting member 220 and the steel pipe pile 400 to be demolished. After the arc burns stably, the power-off control member 320 is in a closed state, and the underwater operator cuts the steel pipe pile 400 to be demolished by moving the cutting member 220.

[0055] It should be noted that the oxygen cylinder 110 provides oxygen for the cutting cabinet 210 to maintain the continuous burning of the cutting member 220, and the impact force of the oxygen flow blows out the molten metal and oxidized slag in the cutting seam, thereby removing the slag of the steel pipe pile 400 to be demolished, so as to facilitate the formation of a cutting seam.

[0056] It can be understood that there is a preset cutting angle between the cutting member 220 and the steel pipe pile 400 to be demolished to improve the cutting effect. That is to say, during the cutting process of the cutting position based on the oxygen-arc cutting principle, there is a preset cutting angle between the cutting member and the steel pipe pile to be demolished.

[0057] It can be understood that the underwater oxygen-arc cutting mechanism uses the high temperature generated by the underwater arc to cause a chemical reaction heat between oxygen and the steel pipe pile 400 to be demolished, heat and melt the steel pipe pile 400 to be demolished, and blow out the molten metal and oxidized slag in the cutting seam by means of the impact force of the oxygen flow, thereby forming a cutting seam, and there is a preset cutting angle between the cutting member 220 and the steel pipe pile 400 to be demolished, effectively improving the cutting effect, and further facilitating the removal of the workpiece after cutting.

[0058] In an embodiment of the present invention, as Figure 4 shown, the preset cutting angle α between the cutting member 220 and the steel pipe pile 400 to be demolished is less than 60°. Optionally, the preset cutting angle α is less than or equal to 45°.

[0059] It can be understood that the steel pipe pile 400 to be demolished is a steel pipe pile. To improve the cutting effect, when cutting the steel pipe pile, especially in the initial arc ignition stage, the cutting angle α between the cutting member 220 and the steel pipe pile 400 to be demolished is equal to 45°. It should be noted here that the cutting angle α between the cutting member 220 and the steel pipe pile 400 to be demolished is the included angle between the plane where the cutting member 220 is located and the tangent of the steel pipe pile.

[0060] According to the underwater oxygen-arc cutting mechanism of the present invention, the arc ignition assembly further includes a copper arc ignition plate (not shown in the figure), the copper arc ignition plate is arranged on the steel pipe pile 400 to be demolished, and the other end of the power supply 310 is connected to the copper arc ignition plate.

[0061] It can be understood that the underwater cutting operator presses the oxygen flow control valve on the cutting cabinet 210 to deliver oxygen, contacts and slides the end of the cutting piece 220 with the copper arc-starting plate to ignite the arc, and turns off the power-off control piece 320 after the arc burns stably; the underwater operator moves the end of the cutting piece 220 to the steel pipe pile 400 to be removed for cutting.

[0062] It can be understood that the underwater oxygen arc cutting mechanism uses the high temperature generated by the underwater electric arc to make the oxygen generate chemical reaction heat with the steel pipe pile 400 to be removed, heat and melt the steel pipe pile 400 to be removed, and use the impact of the oxygen flow to blow away the molten metal and oxidized slag in the cutting seam. As the underwater electric arc continues to move and the oxygen is continuously supplied, the required cutting length is obtained, thereby achieving the purpose of cutting off the steel pipe pile 400 to be removed. It has the characteristics of easy and flexible operation, simple equipment, low cost, and can be widely used for underwater cutting at greater water depths.

[0063] In one embodiment of the present invention, Figure 6 and Figure 7 As shown, the cutting member 220 includes a tube body 221 , a coating 223 and a plurality of cutting wires 222 . The plurality of cutting wires 222 are passed through the tube body 221 , and the coating 223 is arranged on the outer surface of the tube body 221 .

[0064] It is understandable that the cutting piece 220 adopts a cored cutting strip, and the cutting piece 220 includes a tube body 221 and a plurality of cutting wires 222 arranged in the tube body 221. The tube body 221 is coated with a cored strip skin to form a cored strip skin 223 on the outer surface of the tube body 221.

[0065] When the coating 223 burns, it generates a large amount of gas, separating the cutting tube 221 from the water. The coating 223 burns slower than the melting speed of the tube 221, forming a sleeve structure at the end of the tube 221. It should be noted that during underwater cutting, the cutting electrode of the tube 221 can contact the workpiece. Before cutting, each cutting wire 222 should be inspected to ensure good contact.

[0066] In one embodiment of the present invention, Figure 6 and Figure 7 As shown, the cutting piece 220 further includes a waterproof layer 224 coated on the outer surface of the medicine coating 223 .

[0067] Optionally, the waterproof layer 224 can be a waterproof paint applied to the outer surface of the coating 223 to prevent the coating 223 from absorbing water and getting damp. The coating 223 contains easily ionized components to stabilize the arc.

[0068] In one embodiment of the present invention, the tube body 221 has a limiting portion inside for positioning a plurality of cutting wires 222 .

[0069] It can be understood that the limiting part is a limiting block installed inside the pipe body 221. A number of grooves matching the cutting wire 222 are provided on the limiting block for limiting and installing the cutting wire 222. A clamping block is installed in the groove of the limiting block, and the clamping block is clamped with a clamping groove. The clamping groove is opened on the cutting wire 222 for clamping and limiting the cutting wire to prevent it from being blown off by oxygen during use.

[0070] Furthermore, an adhesive layer is coated on the outside of the pipe body 221, and a coating 223 is arranged outside the adhesive layer. Thus, an adhesive layer is provided between the pipe body 221 and the coating 223. After the cutting arc is initiated, there is no need to continue power supply, the cutting member 220 continues to burn, and the arc has high heat and strong cutting penetration.

[0071] In an embodiment of the present invention, as Figure 5 shown, the cutting assembly further includes a second guiding member 230. The second guiding member 230 is arranged at the cutting position of the steel pipe pile 400 to be demolished, and provides a guiding function for the movement of the cutting member 220 to improve the accuracy of the cutting line.

[0072] Optionally, the second guiding member 230 can be a guide hoop structure arranged in the cutting cabinet 210 and placed at the cutting position of the steel pipe pile 400 to be demolished to ensure the accuracy of the cutting line.

[0073] Furthermore, the second guiding member 230 is connected to the cutting cabinet 210, and the second guiding member 230 has an outer arc surface matching the outer surface of the steel pipe pile 400 to be demolished. The second guiding member 230 can be placed on a part of the circumferential surface of the steel pipe pile 400 to be demolished.

[0074] In an embodiment of the present invention, the positive pole of the power supply 310 is connected to the steel pipe pile 400 to be demolished, and the negative pole of the power supply 310 is connected to the cutting cabinet 210.

[0075] It can be understood that in this embodiment, the direct current straight connection method is adopted. The cutting member 220 is connected to the positive pole of the power supply 310, and the steel pipe pile 400 to be demolished is connected to the positive pole of the power supply 310.

[0076] In an embodiment of the present invention, as Figure 3 shown, the gas supply assembly further includes a pressure reducer 130. The pressure reducer 130 is arranged between the first end of the oxygen pipeline 120 and the oxygen cylinder 110.

[0077] It can be understood that the output end of the oxygen cylinder 110 is connected with a pressure reducer 130. The oxygen pipeline 120 uses an oxygen rubber hose. One end of the oxygen rubber hose is connected to the pressure reducer 130, and the other end of the oxygen rubber hose is connected to the cutting cabinet 210. The pressure reducer 130 adjusts the outlet pressure of the oxygen cylinder 110 to a safe and usable pressure level.

[0078] In an embodiment of the present invention, the power-off control member 320 includes a power-off controller or a control switch. Among them, the control switch can adopt a one-way single-throw knife switch to realize the on-off of the power supply 310.

[0079] In a specific embodiment of the present invention, the assembly process of the underwater oxygen arc cutting mechanism is as follows: Connect the pressure reducer 130 to the oxygen cylinder 110, and connect one end of the oxygen hose to the pressure reducer 130, and the other end of the oxygen hose to the cutting torch.

[0080] Connect the cutting cable to one pole of the power supply 310, connect it to the cutting torch through the power-off control member 320, directly connect the other pole of the power supply 310 to the steel pipe pile 400 to be demolished with a cutting cable, and the cutting torch is connected with a cutting member 220.

[0081] Among them, the power supply 310, the power-off control member 320, the oxygen cylinder 110 and the pressure reducer 130 are placed on the water surface facility; a part of the cutting cable and the oxygen hose is above the water surface, and the remaining part is underwater; the cutting cabinet 210 and the cutting member 220 are located underwater.

[0082] It should be noted that the steel pipe pile 400 to be demolished is an underwater steel pipe pile, and the steel pipe pile is cut in sections. For example, the length of the steel pipe pile cut each time does not exceed 12 m, that is, the cutting positions of the cutting member 220 for cutting the steel pipe pile twice should be arranged at intervals along the axial direction of the steel pipe pile, and the distance between the two cutting positions does not exceed 12 m.

[0083] The working process of the underwater oxygen arc cutting mechanism in this embodiment is specifically as follows: First, prepare before cutting and connect the components of the mechanism; among them, the power-off control member 320 is in the off state.

[0084] Secondly, perform underwater cutting; among them, the cutting assembly and the steel pipe pile 400 to be demolished are underwater. The underwater cutting operator gently presses the oxygen flow control valve on the cutting cabinet 210 to send out oxygen, and the onshore staff opens the power-off control member 320, contacts and slides the end of the cutting member 220 with the steel pipe pile 400 to be demolished to ignite the arc; after the arc burns stably, the onshore staff disconnects the power-off control member 320; the underwater operator moves the end of the cutting member 220 to the cutting position of the steel pipe pile 400 to be demolished for cutting. It should be noted that when performing underwater cutting operations, the cutting member does not swing and does not perform stringer bead welding, but only operates along the cutting line; when the cutting member burns to a remaining length of 35 mm from the cutting torch jaw, the cutting should be stopped and a new cutting member should be replaced to prevent damage to the cutting torch and difficulty in replacing the cutting strip.

[0085] Finally, after cutting is completed, disassemble each component. It should be noted here that after the steel pipe pile 400 to be demolished is cut, the cut workpiece section is lifted to effectively remove the steel pipe pile.

[0086] It should be noted that in this embodiment, oxygen is turned on first and then the arc is initiated, and after cutting is completed, the arc is interrupted first and then the oxygen is turned off to improve the cutting effect and avoid burning the cutting piece 220.

[0087] It should be noted that operating machinery is arranged above the water surface to effectively remove the steel pipe pile; during the cutting process of the steel pipe pile, the operating machinery is connected to the steel pipe pile through a wire rope, and during the cutting process of the steel pipe pile, the operating machinery should maintain a stressed state; after cutting is completed, the cut steel pipe pile is lifted out of the water and lifted onto a flatbed truck or a transport barge. Among them, a crawler crane can be used as the operating machinery.

[0088] The working principle of the underwater oxygen-arc cutting mechanism in this embodiment: Utilize the high temperature generated by the underwater electric arc and the chemical reaction heat generated by oxygen and the metal elements of the steel pipe pile 400 to be demolished to heat and melt the steel pipe pile 400 to be demolished, and blow out the molten metal and oxidation slag in the cutting seam with the impact force of the oxygen flow, thereby forming a cutting seam. As the underwater electric arc continuously moves and oxygen is continuously supplied, the cutting piece 220 continuously cuts the steel pipe pile 400 to be demolished to obtain the required cutting length and achieve the purpose of cutting off the steel pipe pile 400 to be demolished.

[0089] In an embodiment of the present invention, during the cutting process, a cutting line guide hoop can be placed at the cutting position to ensure the accuracy of the cutting line. In addition, before cutting, a working platform frame is placed underwater, and the cutting assembly is arranged on the working platform frame, and then the underwater cutting of the steel pipe pile 400 to be demolished is started; after cutting is completed, the working platform frame is removed, and the cut steel pipe is lifted out of the water and lifted onto a flatbed truck or a transport barge.

[0090] In an embodiment of the present invention, as Figure 8 shown, before step 40, the demolition method further includes the step: Step 50: Cut the cutting position based on the wire saw mechanism.

[0091] It can be understood that when concrete is poured into the steel pipe pile 400 to be demolished, the steel pipe pile cannot be effectively cut based on the oxygen-arc cutting principle, so the wire saw mechanism can be used to cut the cutting position.

[0092] Furthermore, before step 30, the demolition method further includes the following content: Determine whether concrete is poured into the steel pipe pile 400 to be demolished, and select a corresponding cutting method based on the determination result. Specifically, when concrete is poured into the steel pipe pile, step 50 is executed; when no concrete is poured into the steel pipe pile, step 30 is executed.

[0093] It should be noted that the steel pipe pile without concrete poured inside can be cut based on the oxygen-arc cutting principle or based on a wire saw mechanism.

[0094] Optionally, an image of the steel pipe pile 400 to be demolished is taken by an imaging mechanism, and based on the image information of the steel pipe pile 400 to be demolished, it is determined whether concrete is poured into the steel pipe pile.

[0095] As Figure 9 shown, the wire saw mechanism includes a beaded wire 510 and a driving component 520. The beaded wire 510 is wound around the driving component 520 and the cutting position of the steel pipe pile 400 to be demolished. The driving component 520 drives the beaded wire 510 to move at the cutting position of the steel pipe pile 400 to cut the steel pipe pile.

[0096] In this embodiment, as Figure 9 shown, the driving component 520 includes a driving member, a driven wheel 521, a driving wheel 522 connected to the driving member, and a transmission member 523 that is cooperatively connected to the driven wheel and the driven wheel 521. The beaded wire 510 uses a diamond beaded wire. The beaded wire 510 is cooperatively connected to the driven wheel and the driven wheel 521. The driving member drives the driving wheel 522 to rotate, and the driving wheel 522 drives the driven wheel 521 to rotate through the transmission member 523, so that the beaded wire 510 rotates around the steel pipe pile, and during the rotation of the beaded wire 510, the steel pipe pile is cut. It should be noted that the driving member can drive the beaded wire 510 to rotate reciprocally along the outer circumference direction of the steel pipe pile.

[0097] Furthermore, the wire saw mechanism further includes a first guiding member 530 for the movement of the beaded wire 510.

[0098] In an embodiment of the present invention, after step 30, the demolition method further includes the following content: Obtain cutting environment parameters; the cutting environment parameters include cutting flame and / or the flow direction of molten slag; based on the cutting environment parameters, determine that the cutting position is penetrated.

[0099] It can be understood that during the cutting of the steel pipe pile or after cutting for a certain period of time, the cutting environment parameters are obtained, and based on the cutting environment parameters, it is determined that the cutting position is penetrated.

[0100] Optionally, the cutting environment parameter can be the cutting flame. Observe the cutting flame. If there is a subsidence phenomenon in the cutting flame, determine the cutting position to be completely penetrated. The cutting environment parameter can also be the slag flow direction. When the slag flow direction is along the water flow direction or along the oxygen flow impact direction, determine the cutting position to be completely penetrated. Of course, the cutting environment parameter can also include both the cutting flame and the slag flow direction at the same time.

[0101] It should be noted that after determining that the cutting position is completely penetrated, a thin sheet or a relatively hard and thin object can be inserted into the cut seam to check along the cut seam. If it passes through smoothly, it indicates that the cutting is completely penetrated. Otherwise, it indicates that there are uncut-through areas and supplementary cutting is required.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for removing underwater steel pipe piles, characterized in that, Including: Determine the cutting position of the steel pipe pile to be demolished; Connect the working machine to the top of the steel pipe pile to be demolished; wherein, the working machine is above the water surface; Cut the cutting position based on the oxygen-arc cutting principle to obtain the cut steel pipe after cutting; wherein, keep the working machine in a stressed state during the cutting process; Lift the cut steel pipe out of the transportation equipment above the water surface through the working machine.

2. The underwater steel pipe pile demolition method according to claim 1, wherein, The cutting the cutting position based on the oxygen-arc cutting principle includes: Based on the high temperature generated by the underwater electric arc, make oxygen react with the steel pipe pile to be demolished to generate chemical reaction heat to heat and melt the cutting position; Based on the impact force of the oxygen flow, blow away the molten metal and oxidation slag generated at the cutting position to form a cut seam at the cutting position.

3. The underwater steel pipe pile demolition method according to claim 2, wherein During the process of cutting the cutting position based on the oxygen-arc cutting principle, there is a preset cutting angle between the cutting piece and the steel pipe pile to be demolished.

4. The underwater steel pipe pile demolition method according to claim 1, wherein, In the connecting the working machine to the top of the steel pipe pile to be demolished, it includes: Apply a lifting hole at the top of the steel pipe pile to be demolished; Connect the boom of the working machine to the lifting hole.

5. The underwater steel pipe pile demolition method according to claim 4, characterized in that, The distance between the lifting hole and the top end of the steel pipe pile to be demolished is greater than or equal to 8 cm.

6. The underwater steel pipe pile demolition method according to any one of claims 1 to 5, characterized in that, The method further includes: Cut the cutting position based on a wire saw mechanism; wherein, the wire saw mechanism includes a bead string and a driving component, and the bead string is wound around the driving component and the cutting position of the steel pipe pile to be demolished.

7. The underwater steel pipe pile demolition method according to claim 6, wherein The driving component includes a driving piece, a driven wheel, a driving wheel connected to the driving piece, and a transmission member cooperatively connected to the driven wheel and the driven wheel; The bead string is cooperatively connected to the driven wheel and the driven wheel.

8. The underwater steel pipe pile demolition method according to claim 7, characterized in that, The wire saw mechanism further includes a first guiding member for the movement of the bead string.

9. The underwater steel pipe pile demolition method according to any one of claims 1 to 5, characterized in that The determining the cutting position of the steel pipe pile to be demolished includes: Determine the riverbed elevation of the area of the steel pipe pile to be demolished; Based on the riverbed elevation, install a cutting elevation positioning member at the mud surface position in the area of the steel pipe pile to be demolished; Determine the cutting position based on the cutting elevation positioning member.

10. The underwater steel pipe pile demolition method according to any one of claims 1 to 5, characterized in that After cutting the cutting position based on the oxygen-arc cutting principle, the method further includes: Obtain cutting environment parameters; the cutting environment parameters include cutting flame and / or molten slag flow direction; Based on the cutting environment parameters, determine that the cutting position is penetrated.

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