Torpedo anchor and using method thereof

Abstract

The invention provides a torpedo anchor and a using method thereof, and relates to the technical field of anchoring equipment.The torpedo anchor comprises an anchor body, an anchor head, an expandable air bag and an electric control igniter, the anchor body comprises a plurality of sub anchor bodies which are sequentially arranged in a nested mode, and a containing space is formed between top plates of any two mutually-nested sub anchor bodies; the anchor head is fixedly connected with the bottom of the sub anchor body on the innermost layer; an explosive medicament is placed in the inflatable air bag; an inflatable air bag is arranged in the accommodating space; the electric control igniter is used for igniting the medicament; the length of the torpedo anchor penetrating into the stratum is increased through an air bag expansion impact method, then the contact area and friction force of the torpedo anchor and the stratum are increased, the uplift bearing capacity of the torpedo anchor is remarkably improved, all the sub anchor bodies are simple in matching structure and high in stability, complex mechanical structures are not needed, and the cost is low. Therefore, on the premise that the torpedo anchor extends in a bottom layer, the torpedo anchor still has good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of anchoring equipment, and particularly to a torpedo anchor and its using method. Background Art

[0002] With the continuous exploration of global marine resources towards the deep sea, the safety and stability of offshore facilities such as offshore oil platforms have become increasingly crucial. Among various deep-water anchor foundation forms, the torpedo anchor has become a deep-water anchor foundation form with great development potential due to advantages such as economical cost, simple and efficient installation, and good mooring performance. In particular, it overcomes the drawback that the installation cost of traditional anchor foundations increases significantly with the increase of water depth. However, currently, the torpedo anchor mainly penetrates the soil by its own gravity, and its uplift resistance mainly depends on the frictional resistance between the side wall of the anchor body and the soil and the overlying soil pressure at the top. However, in the complex deep-sea environment, the uplift resistance of existing torpedo anchors is difficult to meet the growing engineering requirements, and there is a large room for improvement.

[0003] In the field of ocean engineering, increasing the length or uplift force of torpedo anchors has always been a research focus. Currently, there are various technical solutions, such as: traditional mechanical stretching type: by setting a mechanical stretching mechanism inside the anchor body, such as a lead screw nut structure or a hydraulic telescopic rod. During operation, an external power source drives the mechanical structure to make the segments of the anchor body slide relative to each other to achieve elongation. Although this solution can increase the length, the mechanical structure is complex, prone to failure, and has high installation and maintenance costs. Improved type on the anchor body surface: adding rib plates, protrusions and other structures on the surface of the torpedo anchor, or changing the shape of the anchor body to a spiral shape or barbed shape. By increasing the contact area and biting force between the anchor body and the soil to improve the uplift force. However, the uplift force increased by this method is limited, and the effect is unstable under complex geological conditions. Grouting reinforcement type: after the torpedo anchor penetrates the formation, grouting materials such as cement slurry are injected into the soil around the anchor through the grouting pipeline inside the anchor body. To form a more compact combination between the anchor body and the soil and enhance the uplift force. However, the control of the grouting process is difficult, the technical requirements for construction personnel are high, and the cost is relatively high.

[0004] In summary, the existing technologies for increasing the length or uplift force of torpedo anchors have many limitations. Most technologies only focus on unidirectionally improving the local bearing capacity of torpedo anchors and are difficult to comprehensively improve their bearing performance as a whole. In the technologies that rely on the deployment structure to improve the bearing capacity, factors such as the stiffness, quantity, and size of the deployment structure severely restrict the improvement effect, and the deployment structure is prone to reduce the overall stability. In addition, in practical applications, the deployment structure may also be insufficiently deployed due to large soil layer resistance, and thus the deployment failure may occur, making the uplift resistance of existing torpedo anchors difficult to meet the requirements of complex ocean engineering. Summary of the Invention

[0005] The object of the present invention is to provide a torpedo anchor and its using method to solve the problems existing in the above-mentioned prior art, and have good structural stability and high reliability.

[0006] To achieve the above object, the present invention provides the following solution:

[0007] The present invention provides a torpedo anchor, including: an anchor body, an anchor head, an inflatable airbag and an electric control igniter. The anchor body includes a plurality of nested sub-anchor bodies in sequence. Any two nested sub-anchor bodies are slidably matched along the axial direction. There is an accommodation space between the top plates of any two nested sub-anchor bodies. Any two nested sub-anchor bodies have a storage state and an extended state. The relative sliding of any two nested sub-anchor bodies can be converted from the storage state to the extended state; the anchor head is fixedly connected to the bottom of the innermost sub-anchor body; the inflatable airbag is used to place an explosive agent; the inflatable airbag is arranged in the accommodation space; the inflatable airbag has a contracted state and an inflated state; the contracted inflatable airbag can reach the inflated state after the agent explodes; the electric control igniter is used to ignite the agent; in the initial state, any two adjacent sub-anchor bodies are in the storage state, and the inflatable airbag is in the contracted state; after the torpedo anchor penetrates into the bottom layer, the electric control igniter is used to ignite the agent and make the inflatable airbag reach the inflated state, while driving the relative sliding of the two nested sub-anchor bodies and reaching the extended state.

[0008] Preferably, any two nested sub-anchor bodies are slidably matched through a slideway and a slider.

[0009] Preferably, a locking structure is further included. After any two nested sub-anchor bodies reach the extended state, the locking structure can lock the relative positions of the any two nested sub-anchor bodies.

[0010] Preferably, a delay controller is further included, and the delay controller can delay the control of the electric control igniter to ignite the agent.

[0011] Preferably, a sealing ring is arranged in the annular gap between any two adjacent sub-anchor bodies.

[0012] Preferably, the inflated inflatable airbag is in a cylindrical structure.

[0013] Preferably, except for the innermost sub-anchor body, limiting members are arranged on the inner walls of the remaining sub-anchor bodies. The limiting members are arranged close to the top plates of the sub-anchor bodies. One end of the limiting members in any two nested sub-anchor bodies away from the inner wall of the outer sub-anchor body is located in the cylindrical space where the outer wall of the inner sub-anchor body is located.

[0014] Preferably, any two of the sub-anchor bodies nested with each other include an inner sub-anchor body and an outer sub-anchor body. A spring post is arranged on the outer wall of the inner sub-anchor body, and a clamping groove is arranged on the inner wall of the outer sub-anchor body. The clamping groove is arranged near the bottom of the outer sub-anchor body, and the spring post is arranged near the top of the inner sub-anchor body. The relative sliding of the inner sub-anchor body with respect to the outer sub-anchor body can drive the spring post to move along a first path. The clamping groove is arranged at the end of the first path. When the spring post moves to be opposite to the clamping groove, the spring post extends and enters the clamping groove.

[0015] The present invention also provides a method for using the torpedo anchor as described above, including:

[0016] Inspection: Before deployment, comprehensively check the connection of each component of the torpedo anchor and whether the functions are normal;

[0017] Deployment: At a designated target position, lift the torpedo anchor with the working anchor chain and deploy it. The torpedo anchor finally sinks to the designated position;

[0018] Extension: Control the electric ignition device to ignite the agent from top to bottom in sequence through a delay controller.

[0019] Preferably, the time difference of the delay of the delay controller in any two adjacent accommodation spaces is 100-150 seconds.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The present invention uses the airbag expansion impact method to lengthen the length of the torpedo anchor after it penetrates into the formation, thereby increasing the contact area and friction force between the torpedo anchor and the formation, significantly improving the anti-pulling bearing capacity of the torpedo anchor. In addition, the matching structure of each sub-anchor body in this application is simple and has high stability, without complex mechanical structures. Therefore, on the premise that the torpedo anchor can be extended in the bottom layer, it still maintains good stability. In addition, the impact force generated by the explosion of the agent is large, which can overcome the resistance in the formation, so that the device can be extended in the formation better and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the following drawings are only 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.

[0023] Figure 1 It is a schematic structural diagram of the torpedo anchor in the initial state provided by the embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the torpedo anchor in the first-level extended state;

[0025] Figure 3 is Figure 2 partial enlarged view in

[0026] Figure 4 Cross-sectional view of any two mutually nested sub-anchor bodies;

[0027] In the figure: 1 - anchor body; 101 - sub-anchor body; 2 - anchor head; 3 - slideway; 4 - slider; 5 - locking structure; 501 - clamping groove; 502 - spring post; 6 - top plate; 7 - inflatable airbag; 8 - sealing ring; 9 - medicament; 10 - electric ignition device; 11 - delay controller; 12 - limiting member; 13 - wire; 14 - anchor chain; 15 - fin. Specific implementation manner

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The purpose of the present invention is to provide a torpedo anchor and its usage method to solve the problems existing in the prior art and have good structural stability and high reliability.

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0031] Next, in conjunction with Figures 1 to 4 , the embodiments of the present invention will be described.

[0032] Embodiment 1

[0033] The embodiment of the present invention provides a torpedo anchor, comprising: an anchor body 1, an anchor head 2, an expandable airbag 7 and an electronically controlled igniter 10, wherein the anchor body 1 comprises a plurality of sub-anchor bodies 101 which are nested in sequence, any two sub-anchor bodies 101 which are nested with each other slide together along the axial direction, and there is a receiving space between the top plates 6 of any two sub-anchor bodies 101 which are nested with each other, and any two sub-anchor bodies 101 which are nested with each other have a storage state and an extended state, and any two sub-anchor bodies 101 which are nested with each other can slide relative to each other and be converted from the storage state to the extended state; the anchor head 2 is fixedly connected to the bottom of the innermost sub-anchor body 101, and the anchor head 2 is used to guide the fish when penetrating into the formation and in subsequent work torpedo anchor direction; the inflatable airbag 7 is used to place explosive agent 9; the inflatable airbag 7 is arranged in the accommodating space; the inflatable airbag 7 has a contracted state and an expanded state; the inflatable airbag 7 in the contracted state can reach an expanded state after the agent 9 explodes; the electronically controlled igniter 10 is used to ignite the agent 9; in the initial state, any two adjacent sub-anchor bodies 101 are in the stored state, and the inflatable airbag 7 is in the contracted state; after the torpedo anchor penetrates the bottom layer, the electronically controlled igniter 10 is used to ignite the agent 9 and make the inflatable airbag 7 reach the expanded state, while driving the two sub-anchor bodies 101 nested with each other to slide relative to each other and reach the extended state.

[0034] The present invention adopts the air bag expansion impact method to lengthen the length of the torpedo anchor after penetrating the formation, thereby increasing the contact area and friction between the torpedo anchor and the formation, and significantly improving the pull-out bearing capacity of the torpedo anchor. In addition, the sub-anchor bodies 101 in the present application have a simple matching structure and high stability, and do not require a complex mechanical structure, so that the torpedo anchor can maintain good stability while achieving the extension of the torpedo anchor in the bottom layer. In addition, the impact force generated by the explosion of the agent 9 is large, which can overcome the resistance in the formation, so that the device can be better extended in the formation.

[0035] Compared with the existing traditional mechanical stretching solution, the present application utilizes the impact force generated by the expansion of the airbag to open the cylinder, and has a simple structure and higher reliability.

[0036] Compared with the existing anchor body surface improvement solutions, the present application significantly increases the contact area and friction with the formation by spreading the sub-anchor body 101 layer by layer, and the pull-out bearing capacity is more significantly improved.

[0037] Compared with the grouting reinforcement scheme, the present invention adopts the air bag expansion impact method, which is relatively simple to operate and has controllable costs.

[0038] In summary, the torpedo anchor proposed in this application uses the airbag inflation impact method to increase the length of the torpedo anchor. Through the unique airbag inflation impact principle, it can not only effectively increase the length of the torpedo anchor, expand the contact area with the formation, but also improve the uplift bearing capacity while ensuring the stability of the overall structure. It solves the problems of the existing technology from a global perspective and provides a more reliable and efficient solution for marine engineering anchoring, with remarkable innovation and practicality.

[0039] For the convenience of description, any two nested sub-anchor bodies 101 are respectively defined as an inner sub-anchor body and an outer sub-anchor body, and the inner sub-anchor body is nested inside the outer sub-anchor body.

[0040] In some embodiments, any two nested sub-anchor bodies 101 are slidably mated through a slideway 3 and a slider 4.

[0041] This embodiment provides a way of sliding fit. Specifically, the slideway 3 can be arranged on the inner wall of the outer sub-anchor body or the outer wall of the inner sub-anchor body, and the slider 4 is correspondingly arranged on the outer wall of the inner sub-anchor body or the inner wall of the outer sub-anchor body. In other examples, the slider 4 can also be a slide bar.

[0042] In some examples, three slideways 3 and three sliders 4 are provided, and the three slideways 3 and the three sliders 4 are arranged at equal intervals of 120°. This example is used to improve the sliding stability.

[0043] In some embodiments, the medicament 9 is a mixed medicament of guanidine nitrate and copper oxide, and the mass ratio of guanidine nitrate to copper oxide is 2:1. The chemical reaction is triggered by an electric control igniter 10 to generate gas for expansion.

[0044] In some embodiments, the inflatable airbag 7 is a foldable rubber airbag.

[0045] In some embodiments, the embodiment of the present invention further includes a locking structure 5. After any two nested sub-anchor bodies 101 reach the extended state, the locking structure 5 can lock the relative positions of any two nested sub-anchor bodies 101.

[0046] The locking structure 5 in this embodiment can improve the stability of the anchor body 1 in the extended state.

[0047] The locking structure 5 can specifically adopt the following scheme:

[0048] On the outer wall of the inner sub-anchor body, there are elastic columns 502 provided, and on the inner wall of the outer sub-anchor body, there is a clamping groove 501 provided. The clamping groove 501 is arranged near the bottom of the outer sub-anchor body, and the elastic columns 502 are arranged near the top of the inner sub-anchor body. When the inner sub-anchor body slides relative to the outer sub-anchor body, it can drive the elastic columns 502 to move along the first path. The clamping groove 501 is arranged at the end of the first path. When the elastic column 502 moves to be opposite to the clamping groove 501, the elastic column 502 extends and enters the clamping groove 501. Of course, in addition to this, any other locking structure 5 can also be adopted, and the present invention does not limit this.

[0049] The above-mentioned elastic column 502 is a columnar structure with a telescopic function. Preferably, the present invention is a combination of a rigid column and a spring. There is an installation hole on the outer wall of the inner sub-anchor body, and the spring and the rigid column are sequentially installed in the installation hole. At least part of the rigid column extends out of the installation hole. Under normal conditions, under the limiting effect inside the outer sub-anchor body, the rigid column is inserted deeper into the installation hole, that is, the spring is in a compressed state. When the rigid column moves to be opposite to the clamping groove 501, the rigid column extends under the elastic force of the spring and enters the clamping groove 501, thereby achieving the purpose of locking the outer sub-anchor body and the inner sub-anchor body.

[0050] In some embodiments, the clamping groove 501 is arranged at the position of 3 / 5 to 4 / 5 of the length of the outer sub-anchor body to prevent excessive extension and lock the extension length.

[0051] In some embodiments, the embodiment of the present invention further includes a delay controller 11, and the delay controller 11 can delay the control of the electronic ignition device 10 to ignite the agent 9.

[0052] This embodiment can realize the delayed deployment of the torpedo anchor, and then can realize the deployment after the torpedo anchor is inserted into the formation, and can realize the step-by-step deployment. Assuming that the outermost and the second outermost sub-anchor bodies 101 realize the first-stage expansion, then, after the torpedo anchor is inserted into the formation, the agent 9 inside the torpedo anchor is controlled to explode in sequence to realize the first-stage expansion, the second-stage expansion, the third-stage expansion... in sequence.

[0053] In some embodiments, a sealing ring 8 is arranged in the annular gap between any two adjacent sub-anchor bodies 101.

[0054] This embodiment can prevent muddy water from flowing into the annular gap between two adjacent sub-anchor bodies 101, and the pre-compression amount of the sealing ring 8 is 15%-20%.

[0055] In some embodiments, the expandable airbag 7 in the expanded state is in a columnar structure.

[0056] In some embodiments, except for the innermost sub-anchor body 101, the inner walls of the remaining sub-anchor bodies 101 are provided with limiting members 12, and the limiting members 12 are arranged close to the top plate 6 of the sub-anchor bodies 101. The ends of the limiting members 12 in any two mutually nested sub-anchor bodies 101 away from the inner wall of the outer sub-anchor body are located in the cylindrical space where the outer wall of the inner sub-anchor body is located.

[0057] The limiting member 12 in this embodiment is used to limit the inner anchor body from further moving toward the inside of the outer anchor body, so that there is a space for placing the inflatable airbag 7 between the outer anchor body and the inner anchor body.

[0058] In some examples, the stopper 12 may be a block structure or an annular structure. When it is an annular structure, the inner diameter of the annular stopper plate in any sub-anchor body 101 is smaller than the outer diameter of another sub-anchor body 101 nested inside the sub-anchor body 101 .

[0059] In some embodiments, the anchor body 1 preferably includes 3 to 4 sub-anchor bodies 101 .

[0060] In some embodiments, the sub-anchor body 101 is substantially cylindrical.

[0061] Embodiment 2

[0062] The embodiment of the present invention provides a method for using the torpedo anchor described in Embodiment 1, comprising:

[0063] Inspection: Before launching, thoroughly check the connection of all parts of the torpedo anchor and whether they function normally;

[0064] Dropping: At the designated target location, the torpedo anchor is hoisted with the working anchor chain 14 and dropped, and the torpedo anchor finally sinks to the designated location;

[0065] Extension: The delay controller 11 controls the electronically controlled igniter 10 from top to bottom to ignite the reagent 9.

[0066] This embodiment adopts the air bag expansion impact method to lengthen the length of the torpedo anchor after penetrating the formation, thereby increasing the contact area and friction between the torpedo anchor and the formation, and significantly improving the pull-out bearing capacity of the torpedo anchor. In addition, the sub-anchor bodies 101 in the present application have a simple matching structure and high stability, and do not require a complex mechanical structure, so that the torpedo anchor can maintain good stability while achieving the extension of the torpedo anchor in the bottom layer. In addition, the impact force generated by the explosion of the agent 9 is large, which can overcome the resistance in the formation, so that the device can be better extended in the formation.

[0067] In some embodiments, the delay time difference of the delay controllers 11 in any two adjacent containing spaces is 100-150 seconds.

[0068] After the agent 9 explodes, the expansion of two adjacent sub-anchor bodies 101 can be completed within 3 seconds. However, since it takes 97 - 147 seconds of stillness to stabilize the formation that has become unstable due to the explosion shock, thereby improving the uplift bearing capacity of the torpedo anchor and preventing the torpedo anchor from coming out of the formation during the next-level explosion.

[0069] The specific embodiments are as follows:

[0070] Deployment preparation and deployment: At the designated target location, before deployment, comprehensively check the connection of each component of the torpedo anchor and whether its functions are normal. After confirmation, use the working anchor chain 14 to lift the torpedo anchor and deploy it, so that the torpedo anchor finally sinks to the predetermined formation position.

[0071] Start the inflation process: After the torpedo anchor penetrates the formation, apply a pre-tightening force of 20 - 30 kN through the working anchor chain 14 to activate the delay controller 11, and then start the inflatable airbag 7.

[0072] As Figure 2 shown, the first-stage inflatable airbag works: The delay controller 11 triggers the electric igniter 10 in a preset order. The first-stage inflatable airbag completes inflation within 3 seconds after being triggered. The powerful thrust generated pushes the top plate 6 of the inner sub-anchor body 101 away from the top plate 6 of the outer sub-anchor body 101. The inner sub-anchor body 101 slides along the slideway 3 and is locked by the locking structure 5 after moving to the extended state. At this time, the moving amount of the sub-anchor body 101 is 4 / 5 of the length of the sub-anchor body 101.

[0073] Subsequent airbags work in sequence: Subsequent stages of inflatable airbags 7 are triggered and inflated in sequence at intervals of 100 - 150 seconds under the control of the delay controllers 11 of each layer until the required anchoring length is reached. During this process, each inflated airbag pushes the adjacent top plate 6, thereby gradually expanding the adjacent sub-anchor bodies 101 layer by layer. As the length of the torpedo anchor increases, its contact area and friction with the formation increase, and the uplift bearing capacity is significantly improved. When all the airbags have completed inflation and locking, the entire stretching and anchoring process of the torpedo anchor is completed.

[0074] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A torpedo anchor, characterized in that: include: An anchor body, the anchor body comprises a plurality of sub-anchor bodies nested in sequence, any two sub-anchor bodies nested in each other slide together along the axial direction, there is a receiving space between the top plates of any two sub-anchor bodies nested in each other, any two sub-anchor bodies nested in each other have a storage state and an extended state, and any two sub-anchor bodies nested in each other can slide relative to each other to switch from the storage state to the extended state; An anchor head, fixedly connected to the bottom of the innermost sub-anchor body; An inflatable airbag, wherein an explosive agent is placed in the inflatable airbag; the inflatable airbag is arranged in the accommodating space; the inflatable airbag has a contracted state and an expanded state; the inflatable airbag in the contracted state can reach an expanded state after the agent explodes; An electronically controlled igniter, the electronically controlled igniter being used to ignite the reagent; In the initial state, any two adjacent sub-anchor bodies are in a retracted state, and the inflatable airbag is in a contracted state; after the torpedo anchor penetrates the bottom layer, the electronically controlled igniter is used to ignite the agent and make the inflatable airbag reach an inflated state, while driving the two nested sub-anchor bodies to slide relative to each other and reach an extended state.

2. The torpedo anchor according to claim 1, characterized in that: Any two mutually nested sub-anchor bodies are slidably matched through the slideway and the slider.

3. The torpedo anchor according to claim 1, characterized in that: It also comprises a locking structure, and after any two sub-anchor bodies nested with each other reach an extended state, the locking structure can lock the relative positions of the two sub-anchor bodies nested with each other.

4. The torpedo anchor according to claim 1, characterized in that: It also includes a delay controller, which can delay the control of the electronically controlled igniter to ignite the medicine.

5. The torpedo anchor according to claim 1, characterized in that: A sealing ring is provided in the annular gap between any two adjacent sub-anchor bodies.

6. The torpedo anchor according to claim 1, characterized in that: The inflatable airbag in the inflated state has a cylindrical structure.

7. The torpedo anchor according to claim 1, characterized in that: Except for the innermost sub-anchor body, the inner walls of the remaining sub-anchor bodies are all provided with limiting members, and the limiting members are arranged close to the top plate of the sub-anchor body. One end of the limiting members of any two mutually nested sub-anchor bodies away from the inner wall of the outer sub-anchor body is located in the cylindrical space where the outer wall of the inner sub-anchor body is located.

8. The torpedo anchor according to claim 1, characterized in that: Any two of the sub-anchor bodies nested in each other include an inner sub-anchor body and an outer sub-anchor body, the outer wall of the inner sub-anchor body is provided with an elastic column, the inner wall of the outer sub-anchor body is provided with a slot, the slot is provided close to the bottom of the outer sub-anchor body, the elastic column is provided close to the top of the inner sub-anchor body, the inner sub-anchor body slides relative to the outer sub-anchor body to drive the elastic column to move along a first path, the slot is provided at the end of the first path, and when the elastic column moves to face the slot, the elastic column extends and enters the slot.

9. A method for using a torpedo anchor according to any one of claims 1 to 8, characterized in that: include: Inspection: Before launching, thoroughly check the connection of all parts of the torpedo anchor and whether they function normally; Dropping: At the designated target location, the torpedo anchor is hoisted with the working anchor chain and dropped, and the torpedo anchor finally sinks to the designated location; Extension: The electronically controlled igniter is controlled from top to bottom in sequence by a delay controller to ignite the reagent.

10. The method for using a torpedo anchor according to claim 9, characterized in that: The delay time difference between the delay controllers in any two adjacent accommodating spaces is 100-150 seconds.

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