Supporting foundation, underwater work cabin, multi-stage negative pressure cylinder device and installation method thereof

Abstract

The application discloses a supporting foundation, an underwater work cabin, a multistage negative pressure cylinder device and a mounting method thereof, wherein the multistage negative pressure cylinder device comprises a primary cylinder body embedded in mud to a specific depth; a plurality of secondary cylinder bodies are sleeved with each other, the outermost secondary cylinder body is sleeved in the primary cylinder body and extends out of the lower end of the primary cylinder body, and among the two adjacent layers of the secondary cylinder bodies, the secondary cylinder body located at the inner layer extends out of the lower end of the secondary cylinder body located at the outer layer. The multistage negative pressure cylinder device provided by the application adopts a scheme that a plurality of cylinder bodies are connected in series, in addition to the primary cylinder body directly entering the mud, each secondary cylinder body is sleeved in the cylinder body of the upper stage (namely, the adjacent outer layer) and extends out of the cylinder body of the upper stage, so that the overall mud entering depth of the multistage negative pressure cylinder device is gradually increased, the stability is high, the occupied area is small, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of negative pressure cylinder, in particular to a supporting foundation, an underwater work cabin, a multi-stage negative pressure cylinder device and an installation method thereof. BACKGROUND

[0002] The negative pressure cylinder generally refers to a cylindrical barrel with a sealed top and an open bottom. In use, water or air in the barrel can be pumped out by a pump device, and then the barrel is embedded into mud by using the pressure difference between the inside and outside of the barrel to serve as a supporting foundation.

[0003] Please refer to Fig. 1-2 , Fig. 1 is a structural schematic view of a specific embodiment of a supporting foundation with three barrels in parallel in the prior art, Fig. 2 is a structural schematic view of a specific embodiment of a supporting foundation with four barrels in parallel in the prior art.

[0004] Due to the working principle of negative pressure, the pressure difference between the inside and outside of the barrel is limited, and the embedding depth of the negative pressure cylinder into the mud is shallow. Therefore, when used as a supporting foundation, a scheme of multiple negative pressure cylinders in parallel is usually adopted, such as three barrels in parallel as shown in Fig. 1 , four barrels in parallel as shown in Fig. 2 , etc., to improve the structural stability of the supporting foundation, but this undoubtedly leads to an increase in the land occupation area of the supporting foundation.

[0005] Therefore, how to provide a scheme to overcome the above-mentioned defects is still a technical problem to be solved by those skilled in the art. SUMMARY

[0006] The purpose of the present application is to provide a supporting foundation, an underwater work cabin, a multi-stage negative pressure cylinder device and an installation method thereof, wherein the multi-stage negative pressure cylinder device adopts a scheme of multiple barrels in series, has a small land occupation area, high stability and simple structure.

[0007] To solve the above-mentioned technical problems, the present application provides a multi-stage negative pressure cylinder device, which comprises a primary barrel embedded into the mud to a specific depth, and a plurality of secondary barrels in series, wherein the outermost secondary barrel is sleeved in the primary barrel and extends from the lower end of the primary barrel, and in the two adjacent layers of secondary barrels, the inner secondary barrel extends from the lower end of the outer secondary barrel.

[0008] Different from the prior art, the present application adopts a scheme of multiple barrels in series. Except for the primary barrel directly into the mud, each secondary barrel is sleeved in the barrel of the upper stage (i.e. the adjacent outer layer) and extends from the barrel of the upper stage, so as to gradually increase the overall embedding depth of the multi-stage negative pressure cylinder device provided by the present application, and thereby the problems of unreliable fixation and poor overall stability caused by the limited embedding depth of the single negative pressure cylinder in the prior art can be overcome.

[0009] Furthermore, the multi-stage negative pressure cylinder device formed by the above scheme has a land area only as large as that of the first-stage cylinder, and compared with the scheme of arranging multiple cylinders in parallel, the land area of the multi-stage negative pressure cylinder device can be greatly reduced.

[0010] In addition, after the scheme provided by the present application is adopted, the upper steel frame structure for connecting each cylinder arranged in parallel in the prior art can be omitted, which is beneficial to save steel and simplify the overall structure of the multi-stage negative pressure cylinder device when it is used as a support foundation, and has positive significance for reducing the construction period and cost.

[0011] Optionally, the limit structure is arranged between the first-stage cylinder and the outermost secondary cylinder and between two adjacent secondary cylinders.

[0012] Optionally, the limit structure between the first-stage cylinder and the outermost secondary cylinder is a first limit structure, the first limit structure comprises a first inner limit part arranged on the inner wall of the lower end of the first-stage cylinder and a first outer limit part arranged on the outer wall of the upper end of the outermost secondary cylinder, and the first inner limit part and the first outer limit part can abut along the axial direction; and / or, the limit structure between two adjacent secondary cylinders is a second limit structure, the second limit structure comprises a second inner limit part arranged on the inner wall of the lower end of the outer secondary cylinder and a second outer limit part arranged on the outer wall of the upper end of the adjacent inner secondary cylinder, and the second inner limit part and the second outer limit part can abut along the axial direction.

[0013] Optionally, a filler is arranged at the joint between the first-stage cylinder and the secondary cylinder and at the joint between two adjacent secondary cylinders; and / or, a filler is arranged in the first-stage cylinder and each secondary cylinder.

[0014] The present application also provides a mounting method of a multi-stage negative pressure cylinder device, which is suitable for the above multi-stage negative pressure cylinder device, and the mounting method comprises the following steps: step S1, embedding the first-stage cylinder into the mud to a specific depth by the negative pressure sedimentation method; step S2, at least partially removing the mud in the first-stage cylinder; and step S3, mounting each secondary cylinder by the negative pressure sedimentation method, and at least partially removing the mud in the adjacent outer secondary cylinder before mounting the inner secondary cylinder.

[0015] By using this scheme, when the inner-layer cylinder is mounted, the mud in the adjacent outer-layer cylinder has been at least partially removed, which can reduce the resistance caused by the mud in the adjacent outer-layer cylinder to the extension of the inner-layer cylinder when the inner-layer cylinder extends from the adjacent outer-layer cylinder, and thus the extension amount of the inner-layer cylinder relative to the adjacent outer-layer cylinder can be ensured to form the multi-stage negative pressure cylinder device with the gradually increasing mud-embedding depth.

[0016] Optionally, the negative pressure sedimentation method comprises the following steps: using gravity to make the to-be-sedimented cylinder sink into the mud; arranging a cover plate at the upper end of the to-be-sedimented cylinder, and installing a negative pressure source connected with the inside of the to-be-sedimented cylinder; and opening the negative pressure source to control the to-be-sedimented cylinder to sink.

[0017] Optionally, the negative pressure source is a suction pump, the cover plate is provided with a suction port, and the cover plate is detachably arranged at the upper end of the to-be-sedimented cylinder, and the suction pump is connected with the suction port.

[0018] Optionally, the way of removing the mud in the steps S2 and S3 is any one of air lifting, pumping, and mechanical grabbing.

[0019] Optionally, the method further comprises the following steps after the step S3: step S4, arranging a filler at the joint of the primary cylinder and the secondary cylinder and the joint of two adjacent secondary cylinders; and / or step S5, arranging a filler in the primary cylinder and each secondary cylinder.

[0020] The application further provides a support foundation adopting the negative pressure cylinder device, wherein the negative pressure cylinder device is the multi-stage negative pressure cylinder device.

[0021] The application further provides an underwater work cabin adopting the negative pressure cylinder device, wherein the negative pressure cylinder device is the multi-stage negative pressure cylinder device. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 FIG. 1 is a structural schematic diagram of one embodiment of a support foundation with three cylinders in parallel in the prior art;

[0023] Fig. 2 FIG. 2 is a structural schematic diagram of one embodiment of a support foundation with four cylinders in parallel in the prior art;

[0024] Fig. 3 FIG. 3 is a structural schematic diagram of one embodiment of the multi-stage negative pressure cylinder device provided by the application;

[0025] Fig. 4 FIG. 4 is a connection structure diagram of the primary cylinder, the cover plate, and the negative pressure source;

[0026] Fig. 5 FIG. 5 is an exploded enlarged view of the connection of the primary cylinder, the cover plate, and the negative pressure source;

[0027] Fig. 6 FIG. 6 is a local enlarged view of the connection of two adjacent secondary cylinders;

[0028] Fig. 7 FIG. 7 is a schematic diagram of the installation process of the multi-stage negative pressure cylinder device provided by the application;

[0029] Fig. 8 a flow chart of an embodiment of the installation method of the multi-stage negative pressure cylinder device provided by the present application;

[0030] Fig. 9 a connection structure diagram of the multi-stage negative pressure cylinder device provided by the present application as a support foundation and a fan assembly;

[0031] Fig. 10 a schematic diagram of the removal process of a steel pile when the multi-stage negative pressure cylinder device provided by the present application is used as an underwater working cabin.

[0032] Fig. 1-2 The reference signs in the drawings are explained as follows:

[0033] 01 negative pressure cylinder.

[0034] Fig. 3-10 The reference signs in the drawings are explained as follows:

[0035] 1 primary cylinder, 2 secondary cylinder, 3 outer limiting part, 4 inner limiting part, 5 cover plate, 51 suction port, 52 sealing part, 6 negative pressure source, 7 fan assembly, 8 steel pile, 9 filler. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] The term “several” as used herein refers to an indefinite number of multiple, usually more than two; and when “several” is used to represent the number of several components, it does not represent the mutual relationship in the number of the components.

[0038] The terms “first”, “second”, and the like as used herein are only for the convenience of describing structures and / or functions of the same or similar structures or components, and do not represent any special limitation on the order and / or importance.

[0039] Reference is made to Fig. 3-10 , Fig. 3 a structural schematic diagram of an embodiment of the multi-stage negative pressure cylinder device provided by the present application, Fig. 4 a connection structure diagram of the primary cylinder, the cover plate, and the negative pressure source, Fig. 5 an exploded enlarged view of the connection of the primary cylinder, the cover plate, and the negative pressure source, Fig. 6 a local enlarged view of the connection of two adjacent secondary cylinders, Fig. 7 a schematic diagram of the installation process of the multi-stage negative pressure cylinder device provided by the present application, Fig. 8 a flow chart of an embodiment of the installation method of the multi-stage negative pressure cylinder device provided by the present application, Fig. 9The connection structure diagram of the multi-stage negative pressure cylinder device provided by the application as a support foundation and a fan assembly, Fig. 10 The schematic diagram of the multi-stage negative pressure cylinder device provided by the application as an underwater working cabin for the removal process of a steel pile.

[0040] Embodiment one

[0041] As Fig. 3 shown, the application provides a multi-stage negative pressure cylinder device, which comprises a primary cylinder 1 embedded in mud to a specific depth, the specific value of which is not limited here; and a plurality of secondary cylinders 2 connected in series, the outermost secondary cylinder 2 is sleeved in the primary cylinder 1 and extends out of the lower end of the primary cylinder 1, among the two adjacent layers of secondary cylinders 2, the secondary cylinder 2 in the inner layer extends out of the lower end of the secondary cylinder 2 in the outer layer.

[0042] Different from the prior art, the embodiment of the application adopts the scheme of a plurality of cylinders connected in series, in addition to the primary cylinder 1 directly into the mud, each secondary cylinder 2 is sleeved in the cylinder of the upper stage (i.e. the adjacent outer layer) and extends from the cylinder of the upper stage, so as to gradually increase the overall embedding depth of the multi-stage negative pressure cylinder device provided by the application, and thus the problem of unreliable fixation and poor overall stability caused by the limited embedding depth of a single negative pressure cylinder in the prior art can be overcome.

[0043] It can be understood that the embedding depth of the multi-stage negative pressure cylinder device provided by the application is gradually accumulated by a plurality of stages, and the embedding depth of a single cylinder is actually not high, therefore, the length and weight of the primary cylinder 1 and each secondary cylinder 2 can not be large, so that the requirement for a floating crane ship when installing the multi-stage negative pressure cylinder device provided by the application can be lower, and the ship resources can be more easily obtained, which is beneficial to save the installation cost.

[0044] Moreover, the floor area of the multi-stage negative pressure cylinder device formed by the above scheme is only the floor area of the primary cylinder 1, compared with the scheme of a plurality of cylinders arranged in parallel, the floor area of the multi-stage negative pressure cylinder device can be greatly reduced.

[0045] In addition, in combination with the background technology Fig. 1 and Fig. 2 It can be known that when a plurality of cylinders are arranged in parallel, a complex upper steel frame structure needs to be set to connect between the cylinders, and after adopting the scheme provided by the application, the above-mentioned upper steel frame structure can be omitted, which is beneficial to save steel and can simplify the overall structure of the multi-stage negative pressure cylinder device as a support foundation, which has positive significance for shortening the construction period and reducing the cost.

[0046] In this embodiment, the number of secondary cylinders 2 is not limited, and in actual implementation, a person skilled in the art can design according to the actual depth of the mud and other parameters. Generally, the more the number of secondary cylinders 2, the greater the overall depth of the multi-stage negative pressure cylinder device into the mud.

[0047] The limiting structure can be arranged between the primary cylinder 1 and the outermost secondary cylinder 2 and between two adjacent secondary cylinders 2. The limiting structure can limit the axial direction between the two adjacent cylinders to prevent the inner cylinder from being pulled out of the adjacent outer cylinder (i.e., the two adjacent cylinders are disconnected). In addition, the amount of extension of the inner cylinder relative to the adjacent outer cylinder can also be controlled to prevent the two adjacent cylinders from being disconnected.

[0048] The limiting structure can include an outer limiting portion 3 arranged on the outer wall of the inner cylinder and an inner limiting portion 4 arranged on the inner wall of the adjacent outer cylinder. In the limit of the assembly state, that is, when the extension amount of the inner cylinder relative to the adjacent outer cylinder is the largest, the outer limiting portion 3 and the inner limiting portion 4 of the two adjacent cylinders can be axially abutted.

[0049] For the sake of description, the limiting structure between the primary cylinder 1 and the outermost secondary cylinder 2 can be referred to as a first limiting structure. The first limiting structure can include a first inner limiting portion (such as the inner limiting portion 4 in Fig. 4 ) arranged on the inner wall of the lower end of the primary cylinder 1 and a first outer limiting portion (refer to the outer limiting portion 3 in Fig. 6 ) arranged on the outer wall of the upper end of the outermost secondary cylinder 2. In the limit of the assembly state, that is, when the extension amount of the outermost secondary cylinder 2 relative to the primary cylinder 1 is the largest, the first inner limiting portion and the first outer limiting portion can be axially abutted.

[0050] The limiting structure between the two adjacent secondary cylinders 2 can be referred to as a second limiting structure. The second limiting structure can include a second inner limiting portion arranged on the inner wall of the lower end of the outer secondary cylinder 2 and a second outer limiting portion arranged on the outer wall of the upper end of the adjacent inner secondary cylinder 2. In the limit of the assembly state, that is, when the extension amount of the inner secondary cylinder 2 relative to the adjacent outer secondary cylinder 2 is the largest, the second inner limiting portion and the second outer limiting portion can be axially abutted.

[0051] Specifically, the inner limiting portion 4 can adopt an integral annular structure, such as an annular plate, etc. Alternatively, the inner limiting portion 4 can be a circumferentially non-enclosed structure, such as a limiting block protruding in the radial direction, an arc-shaped limiting plate, etc. The number of such limiting members can be one or more. When there are multiple limiting members, the limiting members can be distributed at intervals in the circumferential direction.

[0052] The structure of the outer limiting part 3 can be consistent with the inner limiting part 4. It should be noted that if the outer limiting part 3 and the inner limiting part 4 are not an integral annular structure, the installation direction of the adjacent two layers of cylinder bodies needs to be paid attention to during installation, so as to ensure that the outer limiting part 3 can be axially abutted with the inner limiting part 4. Alternatively, as shown in Fig. 6 the outer limiting part 3 can also be a flange plate arranged at the end of the corresponding cylinder body. At this time, the outer limiting part 3 not only bears the function of cooperating with the inner limiting part 4 to realize axial limiting, but also can serve as the connecting part of the corresponding cylinder body and the cover plate 5. The function of the cover plate 5 and the specific connecting structure can refer to Embodiment Two.

[0053] The filler 9 can be cement slurry, which can be arranged at the joint between the primary cylinder body 1 and the secondary cylinder body 2 and the joint between the adjacent two secondary cylinder bodies 2. The filler 9 can solidly connect the cylinder bodies into a whole, which is beneficial to improve the reliability of the joint between the cylinder bodies and further improve the overall performance of the multi-stage negative pressure cylinder device provided by the application. In addition, the adjacent two layers of cylinder bodies can also be connected by welding or other mechanical connection methods. However, compared with the cement slurry pouring method, the cement slurry pouring method is simpler and more convenient to operate, which is the preferred scheme of the embodiment of the application.

[0054] Further, the filler 9, which can be cement slurry, can be arranged in the primary cylinder body 1 and each secondary cylinder body 2. At this time, the cylinder bodies can form a solid whole, so as to have excellent pull-out resistance and overturning resistance, which is more conducive to the multi-stage negative pressure cylinder device provided by the application as a support foundation.

[0055] Embodiment Two

[0056] For the multi-stage negative pressure cylinder device involved in each embodiment of Embodiment One, as shown in Fig. 8 the application further provides a method for installing the multi-stage negative pressure cylinder device. The method comprises the following steps: step S1, embedding the primary cylinder body 1 into the mud to a specific depth by the negative pressure settlement method; step S2, at least partially removing the mud in the primary cylinder body 1; and step S3, installing each secondary cylinder body 2 by the negative pressure settlement method, and at least partially removing the mud in the adjacent outer secondary cylinder body 2 before installing the inner secondary cylinder body 2.

[0057] By adopting this scheme, when the inner layer cylinder body is installed, the mud in the adjacent outer layer cylinder body has been at least partially removed, which can reduce the resistance of the mud in the adjacent outer layer cylinder body to the extension of the inner layer cylinder body from the adjacent outer layer cylinder body, so as to ensure the extension amount of the inner layer cylinder body relative to the adjacent outer layer cylinder body, so as to form the multi-stage negative pressure cylinder device with the gradually increasing mud-embedding depth involved in each embodiment of Embodiment One.

[0058] When installing, the mud in the outer cylinder can be completely removed. This installation method can be seen from Fig. 7 At this time, the inner layer cylinder is basically only in friction with the external mud during the extension process, and the inner layer cylinder can have the maximum extension relative to the adjacent outer layer cylinder; or, only part of the mud in the outer cylinder can be removed, and at this time, the remaining part of the mud in the outer cylinder can fill the joint between the adjacent two layers of cylinders during the extension of the inner layer cylinder relative to the adjacent outer layer cylinder, which has a positive effect on ensuring the connection reliability of the joint between the adjacent cylinders.

[0059] The mud in the innermost layer cylinder can be removed or not removed, depending on the purpose of the multi-stage negative pressure cylinder device. For example, when the multi-stage negative pressure cylinder device is used as a support foundation, the mud in the innermost layer cylinder can not be removed to improve the strength; when the multi-stage negative pressure cylinder device is used as an underwater working cabin, the mud in the innermost layer cylinder can be partially removed or completely removed, which can be determined according to the actual working conditions.

[0060] The aforementioned negative pressure sedimentation method can include the following steps: step a, using gravity to make the sedimentation cylinder sink into the mud, where the sinking into the mud means that the lower end of the sedimentation cylinder is embedded in the mud by a certain depth, and the specific embedding depth is related to the gravity of the sedimentation part and the looseness of the soil; step b, setting a cover plate 5 on the upper end of the sedimentation cylinder, and installing a negative pressure source 6 connected to the inside of the sedimentation cylinder; step c, starting the negative pressure source 6 to control the sedimentation of the sedimentation cylinder.

[0061] It should be noted that the above steps a and b do not have a sequence, as long as they are completed before step c. After the sedimentation cylinder with the cover plate 5 and the negative pressure source 6 is installed and sinks into the mud, the cover plate 5, the cylinder wall of the sedimentation cylinder and the mud surface can form a closed space, at this time, the negative pressure source 6 is started, and a negative pressure can be formed in the above-mentioned closed space, and the pressure difference between the inside and outside of the sedimentation cylinder can control the further sedimentation of the sedimentation cylinder.

[0062] The above-mentioned negative pressure source 6 can be a suction pump, and the cover plate 5 can be provided with a suction port 51. The cover plate 5 is detachably installed on the upper end of the sedimentation cylinder, which can be fixed by connecting members such as bolts and screws. The connection part between the sedimentation cylinder and the cover plate 5 can be the outer limiting part 3 mentioned in embodiment one, and a sealing member 52 in the form of a sealing ring or a sealing pad can be provided between the cover plate 5 and the sedimentation cylinder to realize the sealing between the cover plate 5 and the sedimentation cylinder. The suction pump and the suction port 51 can also be fixed by connecting members such as bolts and screws, and a sealing member 52 can also be provided therebetween to ensure the sealing performance.

[0063] After the settlement of one to be settled cylinder is completed, the cover plate 5 connected with the to be settled cylinder and the negative pressure source 6 need to be removed, and then the settlement of another to be settled cylinder is carried out. In this process, the negative pressure source 6 and the mud cleaning equipment used later can be reused.

[0064] The way of removing the mud in steps S2 and S3 can be any one of air lifting, pumping, mechanical grabbing and the like. Taking the air lifting and pumping schemes as examples, when the mud is removed, high-pressure water can be sprayed into the cylinder (or water is poured and mechanical crushing is matched) to form mud slurry, and then the mud slurry in the cylinder is removed by air lifting or pumping.

[0065] It should be noted that air lifting is commonly used in downhole lifting of crude oil, which refers to a process of injecting high-pressure gas into a well from the ground to mix with the fluid in the well, reducing the density of the mixed liquid in the cylinder by gas expansion, and then lifting the mixed liquid in the well to the ground. Pumping is to set a pump body to pump out the mud slurry in the cylinder. The mechanical grabbing method does not need to inject water, but directly grabs the mud of the cylinder by mechanical equipment.

[0066] After step S3, steps S4 and / or S5 can be further included. In step S4, a filler 9 is arranged at the joint between the primary cylinder 1 and the secondary cylinder 2 and the joint between two adjacent secondary cylinders 2. In step S5, the filler 9 is arranged in the primary cylinder 1 and each secondary cylinder 2. The filler 9 can be cement slurry, which can fixedly connect the cylinders as a whole, so that the multi-stage negative pressure cylinder device has excellent pull-out resistance and overturning resistance.

[0067] In the traditional scheme, if the mud penetration depth of the negative pressure cylinder is to be increased, a large pile hammer or the like is usually needed, which on the one hand increases energy consumption and on the other hand causes noise pollution. After the installation method of the multi-stage negative pressure cylinder device provided by the present application is adopted, the pile hammer is not needed, and a sufficient mud penetration depth can be ensured, and noise is basically not generated, which is beneficial to protecting the marine ecology.

[0068] Embodiment Three

[0069] As shown in Fig. 9 The present application also provides a support foundation adopting the negative pressure cylinder device, which can be the multi-stage negative pressure cylinder device involved in the embodiments of embodiment one, and is used for supporting the wind turbine assembly 7 arranged on the sea and the like.

[0070] Since the multi-stage negative pressure cylinder device in embodiment one has the technical effects as above, the support foundation with the multi-stage negative pressure cylinder device also has similar technical effects, which are not described here.

[0071] When operating at sea, there are many components buried in the seabed, and when not in use, the removal of these components often has great difficulty.

[0072] For this purpose, as Fig. 10 shown, the application can also provide an underwater work cabin, using a negative pressure cylinder device, which can be a multi-stage negative pressure cylinder device involved in the embodiments of embodiment one. Taking the steel pile 8 buried in the seabed as an example, in specific practice, each cylinder can be placed step by step, and then the steel pile 8 can be removed in sections.

[0073] It should be emphasized that the support foundation and the underwater work cabin here are only two specific application scenarios of the multi-stage negative pressure cylinder device provided by the application, and in addition to this, the multi-stage negative pressure cylinder device provided by the application can also be used in other fields, that is, the application field cannot actually limit the implementation range of the multi-stage negative pressure cylinder device provided by the application.

[0074] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled persons in the art, without departing from the principles of the application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A method for installing a multi-stage negative pressure cylinder device for an underwater working chamber, characterized in that, The underwater working chamber adopts a negative pressure cylinder device, which is a multi-stage negative pressure cylinder device. The multi-stage negative pressure cylinder device includes a first-stage cylinder (1) and several nested secondary cylinders (2). The installation method includes the following steps: Step S1: The first-stage cylinder (1) is embedded into the mud to a set depth using the negative pressure settling method; Step S2, at least partially remove the mud from the inside of the first-stage cylinder (1); Step S3: Install each of the secondary cylinders (2) using the negative pressure settling method. Before installing the inner secondary cylinder (2), at least partially remove the mud inside the adjacent outer secondary cylinder (2). The outermost secondary cylinder (2) is fitted inside the first-stage cylinder (1) and extends out of the lower end of the first-stage cylinder (1) to be partially embedded in the mud. In the two adjacent secondary cylinders (2), the inner secondary cylinder (2) extends out of the lower end of the outer secondary cylinder (2) to be partially embedded in the mud. After step S3, the method further includes step S4, where filler (9) is provided at the junction of the primary cylinder (1) and the secondary cylinder (2) and at the junction of two adjacent secondary cylinders (2). The process includes step S5 after step S3, where filler (9) is placed inside the first-stage cylinder (1) and each of the secondary cylinders (2).

2. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to claim 1, characterized in that, The negative pressure sedimentation method includes the following steps: Gravity is used to cause the sedimentation cylinder to sink into the mud. A cover plate (5) is installed at the upper end of the settling cylinder, and a negative pressure source (6) connected to the inside of the settling cylinder is installed. Turn on the negative pressure source (6) to control the settling of the cylinder to be settled.

3. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to claim 2, characterized in that, The negative pressure source (6) is a suction pump. The cover plate (5) is provided with a suction port (51). The cover plate (5) is detachably installed on the upper end of the cylinder to be settled, and the connection between the two is sealed. The suction pump is connected to the suction port (51).

4. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to any one of claims 1-3, characterized in that, Limiting structures are provided between the primary cylinder (1) and the outermost secondary cylinder (2), and between adjacent secondary cylinders (2).

5. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to claim 4, characterized in that, The limiting structure between the first-stage cylinder (1) and the outermost secondary cylinder (2) is a first limiting structure. The first limiting structure includes a first inner limiting part on the inner wall of the lower end of the first-stage cylinder (1) and a first outer limiting part on the outer wall of the upper end of the outermost secondary cylinder (2). The first inner limiting part and the first outer limiting part can abut against each other along the axial direction.

6. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to claim 4, characterized in that, The limiting structure between two adjacent secondary cylinders (2) is a second limiting structure. The second limiting structure includes a second inner limiting part disposed on the inner wall of the lower end of the outer secondary cylinder (2) and a second outer limiting part disposed on the outer wall of the upper end of the adjacent inner secondary cylinder (2). The second inner limiting part and the second outer limiting part can abut against each other along the axial direction.

7. The installation method of the multi-stage negative pressure cylinder device for the underwater working chamber according to any one of claims 1-3, characterized in that, The mud removal methods in steps S2 and S3 are any one of air lift, pumping, and mechanical gripping.

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