Cooling water pipe for gravity dam construction based on destroying laminar sublayer and method thereof

Abstract

The present application belongs to the technical field of mass concrete construction, and aims to solve the problem of high thermal resistance and slow heat dissipation of traditional cooling pipe laminar bottom layer, and discloses a gravity dam construction cooling water pipe based on destruction of laminar bottom layer and a method thereof. The cooling water pipe comprises a plurality of series water pipe units, each water pipe unit comprises a steel pipe, a flexible spring hose is arranged in the steel pipe, and the spring hose forms a spiral protruding turbulence structure along the inner wall of the steel pipe; the hose is fixed by pointwise anchoring and outer wall surface bonding with glue, and a ring is arranged at both ends for limiting and assisting turbulence. The present application breaks through the thermal resistance of laminar bottom layer, greatly improves the hydration heat conduction efficiency, is convenient to construct and has durable structure, and is suitable for mass concrete temperature control requirements.

Description

Technical Field

[0001] This invention belongs to the field of large-volume concrete construction technology, specifically to a method and mechanism for constructing cooling water pipes for gravity dams based on disrupting the laminar flow sublayer. Background Technology

[0002] In the construction of large-volume concrete structures such as gravity dams, cooling water is circulated through cooling water pipes. The heat exchange between the water flow inside the pipe and the concrete outside the pipe removes the heat of hydration, thus achieving temperature gradient control. The core objective is to enable the water flow to dissipate heat quickly. However, traditional cooling pipes are mostly steel pipes with smooth inner walls. The laminar flow layer (also known as the "dead water film") has excessively high thermal resistance, becoming the biggest bottleneck to heat transfer efficiency. Regardless of whether the water flow is laminar (flow velocity < 0.5 m / s) or turbulent (flow velocity 1-3 m / s), the viscous force between the smooth pipe wall and the water flow will form a "dead water film" with a flow velocity close to zero. Heat must first pass through the steel pipe wall from the concrete and then through this "dead water film" that relies solely on molecular heat conduction to reach the core of the water flow. The thermal resistance of this film accounts for 60% to 80% of the total thermal resistance, which is equivalent to adding a "heat insulation layer," resulting in very slow heat dissipation.

[0003] Slow heat dissipation prevents the hydration heat inside the concrete from escaping, resulting in a temperature control lag problem of "rapid heating and slow cooling," which easily leads to temperature cracks. Ultimately, this weakens the structure's load-bearing capacity, impermeability, and durability, becoming a core challenge in engineering quality control. More importantly, this "dead water film" is difficult to overcome: slow water flow results in a thicker film, allowing heat to accumulate for longer; even increasing the water pump power and flow rate can only slightly thin the film, failing to effectively impact the film layer, resulting in very limited improvement in heat dissipation, and still causing excessive temperature differences between the inside and outside of the concrete, leading to cracks.

[0004] Clearly, optimizing parameters such as "increasing flow rate and increasing pipe density" cannot completely solve the problem; only by upgrading the technology by starting with the structural design that "disrupts the laminar flow layer" can the heat transfer efficiency be fundamentally improved and the temperature control requirements of large-volume concrete be met. Summary of the Invention

[0005] Based on the problems existing in the background technology, the present invention proposes a gravity dam construction cooling water pipe and method based on disrupting the laminar flow layer.

[0006] Firstly, this technical solution proposes a gravity dam construction cooling water pipe based on disrupting the laminar flow sublayer. The pipe includes several pipe units connected in series. Each pipe unit comprises a steel pipe with a flexible spring hose embedded inside. The spring hose is fixedly connected to the inner wall of the steel pipe, and the spring hose forms a spiral protrusion along the inner wall of the steel pipe, creating an uneven, turbulent structure. The wall of the spring hose has several spaced through holes along the spiral line. The spring hose is filled with a first adhesive, which flows out through the through holes and connects to the inner wall of the steel pipe, solidifying to form several point anchoring points. The outer wall of the spring hose is bonded to the inner wall of the steel pipe with a second adhesive, forming a continuous reinforced structure along the spiral line.

[0007] Preferably, adjacent water pipe units are connected by welding, flanges, or pipe sections.

[0008] Preferably, the two ends of the spring hose are respectively connected to a ring sleeve, which is fitted inside the steel pipe and fixedly connected to the inner wall of the end of the steel pipe.

[0009] Preferably, the ring sleeve has a groove, and the end of the spring hose is fitted into the groove, the thickness of the groove being less than the diameter of the spring hose.

[0010] Secondly, this technical solution also proposes an assembly method for gravity dam construction cooling water pipes based on disrupting the laminar sublayer, which is used to construct gravity dam construction cooling water pipes based on disrupting the laminar sublayer. The steps include the following:

[0011] S1, Water pipe units are manufactured in the factory:

[0012] S11, Install a spring hose inside the steel pipe: Pull and stretch the spring hose to reduce its diameter, ensuring it can be smoothly inserted into the steel pipe; pass the spring hose through the steel pipe; release the spring hose and use its elastic restoring force to make it fit tightly against the inner wall of the steel pipe.

[0013] S12, Flattening and sealing of spring hose: An air bladder is installed inside the spring hose, with both ends of the air bladder extending outside the steel pipe; the air bladder is inflated, and as the air bladder expands, a compression space is formed between the air bladder and the inner wall of the steel pipe, flattening the spring hose; at this time, the through hole on the spring hose changes from "line contact" to "surface contact" with the inner wall of the steel pipe, and the through hole is completely covered.

[0014] S13, Point Anchoring: Inject the first glue into the spring hose. After the first glue flows out through the through hole, it comes into contact with the inner wall of the steel pipe. After curing, it forms several point anchoring points, thus achieving the initial fixation between the spring hose and the inner wall of the steel pipe.

[0015] S14, Surface bonding: Deflat the airbag and pull it out of the spring hose; drip a second adhesive along the outer wall of the spring hose, and the second adhesive flows naturally along the spiral line of the spring hose, filling the gap between the spring hose and the inner wall of the steel pipe, and achieving secondary reinforcement after curing;

[0016] Repeat steps S11-S14 to complete the fabrication of multiple water pipe units;

[0017] S2, On-site assembly:

[0018] Multiple water pipe units manufactured in the factory are transported to the construction site and connected in series according to the design requirements to form a complete cooling water pipe system.

[0019] Preferably, S1 also includes an installation ring, the specific method of which is as follows:

[0020] A groove is made on the ring, and the end of the spring hose is fitted into the groove and fixed; one of the rings is slid in along the axis of the steel pipe, and the spring hose is pulled by the ring, and the spring hose is automatically inserted into the steel pipe by gravity; after insertion, the two rings are positioned at the designed positions at the ends of the steel pipe and welded to fix them.

[0021] When the airbag is inflated, the ring acts as a limit; when the outer wall of the airbag contacts the inner wall of the ring, inflation stops to ensure that the spring hose is properly flattened and to avoid excessive deformation and damage.

[0022] The above technical solution has the following advantages:

[0023] 1. This invention, by installing a spring hose inside a steel pipe, creates an uneven, turbulent surface on the originally smooth inner wall. When water flows through, the spiral protrusions formed by the spring hose create a cutting-like disturbance in the water flow, fundamentally breaking through the thermal resistance bottleneck of the laminar flow layer in existing technologies. Ultimately, it enables heat to quickly penetrate the pipe wall and directly enter the core of the water flow, solving the fundamental problems of "slow heat dissipation and delayed temperature control" in traditional solutions. This significantly improves the efficiency of heat dissipation from hydration inside concrete.

[0024] 2. This invention overcomes thermal resistance structurally, eliminating the need for high flow rates or dense pipework. Under the same heat dissipation requirements, it effectively reduces pump power and pipe usage, while avoiding the impact of dense pipework on concrete structures.

[0025] 3. The spring hose adopts a point-to-surface fixing method. The first adhesive forms a point anchor through the through hole of the spring hose to prevent the spring hose from shifting axially. The second adhesive forms a surface bond along the spiral line. The second adhesive fills the gap between the spring hose and the inner wall of the steel pipe, so that the spiral protrusion and the steel pipe form an integral whole, avoiding local deformation or loosening caused by water flow impact. The double adhesive design effectively improves the structural adhesion, has good stability, and can withstand long-term water flow impact and vibration loads during the concrete curing period.

[0026] 4. The ring design serves three purposes: First, the ring can quickly guide the spring hose through the pipe, improving work efficiency; second, the ring can limit the compression amplitude when the airbag is inflated, preventing the spring hose from being excessively flattened and damaged; third, the rings of adjacent water pipe units can form additional local unevenness at the pipe joint, playing an additional role in assisting turbulence and compensating for unevenness. When water flows through the joint, it will first encounter the ring, and the originally smooth water flow will be blocked, forming a small-scale vortex. This can directly disperse any stagnant water film that may form at the joint, and form a relay turbulence with the spiral protrusion of the spring hose. That is, the spiral protrusion is responsible for the turbulence throughout the entire process, and the ring is responsible for strengthening the turbulence at the joint, ensuring that there are no weak points in the heat dissipation of the entire pipe; the presence of the ring can prevent smooth sections from appearing at the joints of adjacent units, keeping the inner wall of the entire cooling pipe (including the joint position) in an uneven state. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0028] Figure 1 This is a diagram showing the layout of cooling water pipes during the construction of a gravity dam that disrupts the laminar flow layer.

[0029] Figure 2 yes Figure 1 A three-dimensional diagram of cooling water pipes used in the construction of a gravity dam based on disrupting the laminar flow layer.

[0030] Figure 3 yes Figure 2 A perspective view of cooling water pipes used in the construction of a gravity dam based on disrupting the laminar flow layer.

[0031] Figure 4 It is a 3D view of a spring hose in a single water pipe unit.

[0032] Figure 5 This is an exploded view of adjacent water pipe units connected together.

[0033] Figure 6 This is a cross-sectional view of the spring hose being flattened by the airbag.

[0034] Figure 7 This is a perspective view of another embodiment of the water pipe unit.

[0035] Figure 8 yes Figure 7 A schematic diagram of the structure when the spring hose and the ring sleeve are engaged.

[0036] Figure 9 yes Figure 7 Perspective view of the greywater pipe unit.

[0037] Figure 10 yes Figure 7 Side view of the greywater pipe unit.

[0038] Figure 11 yes Figure 7 A schematic diagram of the structure of the greywater pipe unit with an internal airbag.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Water pipe unit; 2. Inlet pipe; 3. Outlet pipe; 4. Concrete chamber; 5. Spring hose; 6. Through hole; 7. Steel pipe; 8. Pipe section; 9. Airbag; 10. Ring; 11. Groove. Detailed Implementation

[0041] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1 - Figure 6 As shown in the figure, this embodiment proposes a cooling water pipe for gravity dam construction based on disrupting the laminar sublayer. The cooling water pipe includes several water pipe units 1 connected in series. During construction, the cooling water pipe as a whole can be arranged in a serpentine pattern within the concrete chamber 4. The two ends of the cooling water pipe are connected to an inlet pipe 2 and an outlet pipe 3, respectively. The specific structure of the water pipe unit 1 is as follows:

[0044] The water pipe unit 1 includes a steel pipe 7, inside which is a flexible spring hose 5. The spring hose 5 is fixedly connected to the inner wall of the steel pipe 7. The spring hose 5 forms a spiral protrusion along the inner wall of the steel pipe 7, so that the inner wall of the steel pipe 7 forms an uneven turbulence structure.

[0045] In this embodiment, the material of the spring hose 5 includes, but is not limited to, EPDM (ethylene propylene diene monomer) rubber, PE / TPR thermoplastic elastomer, nitrile rubber, and rubber-fiber composite materials. In this embodiment, EPDM rubber is preferred, with its core advantages: excellent elasticity, rapid recovery of its original shape after stretching to ensure tight contact with the inner wall of the steel pipe 7, resistance to water and cooling water corrosion, no aging even after long-term immersion in water, and a wide temperature range (-40℃~120℃), fully covering the temperature requirements for concrete cooling.

[0046] In this embodiment, steel pipe 7 can be Q235 low carbon steel pipe, a commonly used material in engineering.

[0047] In some embodiments, adjacent water pipe units 1 are connected by welding, flanges, or pipe sections 8. This part is a conventional pipe connection technique and will not be described in detail.

[0048] In some embodiments, the wall of the spring hose 5 is provided with a plurality of spaced through holes 6 along a spiral line, which ensure that glue can seep out.

[0049] The spring hose 5 is filled with a first adhesive. After the first adhesive flows out through the through hole 6, it connects with the inner wall of the steel pipe 7 and solidifies to form several point anchoring points.

[0050] The outer wall of the spring hose 5 is bonded and fixed to the inner wall of the steel pipe 7 with a second adhesive, forming a continuous reinforced structure along the spiral line.

[0051] As can be seen, the spring hose 5 adopts a point-to-surface fixing method. The first adhesive forms a point anchor through the through hole 6 of the spring hose 5 to prevent the spring hose 5 from shifting axially. The second adhesive forms a surface bond along the spiral line. The second adhesive fills the gap between the spring hose 5 and the inner wall of the steel pipe 7, so that the spiral protrusion and the steel pipe 7 form an integral whole, avoiding local deformation or loosening caused by water flow impact. The double adhesive design effectively improves the structural adhesion, has good stability, and can withstand long-term water flow impact and vibration loads during the concrete curing period.

[0052] In this embodiment, the first adhesive can be a fast-curing epoxy adhesive, used for anchoring through hole 6, possessing waterproof properties and bonding strength. The second adhesive can be a flexible epoxy adhesive, which has a certain degree of elasticity after curing, used for continuous spiral bonding, avoiding cracking due to temperature changes.

[0053] It should be noted that when the spring hose 5 is unfilled, it is in a flexible, hollow state, which is prone to problems such as local bulging and collapse, and spiral shape displacement when impacted by the water flow inside the hose, thus reducing the turbulence effect. However, after the first adhesive is filled and cured, the first adhesive and the spring hose 5 form a rigid spiral skeleton, which effectively improves its radial compressive strength. It can withstand the long-term impact of high-velocity water flow, ensuring the continuous and stable turbulence effect and avoiding the decrease in heat exchange efficiency due to structural deformation. In addition, after filling, the solid adhesive layer can act as a heat-conducting bridge, optimizing the heat transfer path and enhancing the heat exchange effect.

[0054] This embodiment also proposes an assembly method for cooling water pipes used in the construction of gravity dams based on disrupting the laminar sublayer, which includes the following steps:

[0055] S1, Water pipe unit 1 is manufactured in the factory:

[0056] S11, Install a spring hose 5 inside the steel pipe 7: Pull and stretch the spring hose 5 to reduce its diameter, ensuring it can be smoothly inserted into the steel pipe 7; pass the spring hose 5 through the steel pipe 7; loosen the spring hose 5 and use its elastic restoring force to make the spring hose 5 fit tightly against the inner wall of the steel pipe 7.

[0057] S12, Flattening of the spring hose 5 and sealing of the through hole 6: An air bladder 9 is fitted inside the spring hose 5, with both ends of the air bladder 9 extending outside the steel pipe 7; the air bladder 9 is inflated, and as the air bladder 9 expands, a compression space is formed between the air bladder 9 and the inner wall of the steel pipe 7, flattening the spring hose 5; at this time, the through hole 6 on the spring hose 5 and the inner wall of the steel pipe 7 change from "line contact" to "surface contact", and the through hole 6 is completely covered by the inner wall of the steel pipe 7, preventing glue leakage.

[0058] S13, Point Anchoring: Inject the first adhesive into the spring hose 5. After the first adhesive flows out through the through hole 6, it comes into contact with the inner wall of the steel pipe 7. After curing, it forms several point anchoring points, realizing the initial fixation between the spring hose 5 and the inner wall of the steel pipe 7. It should be noted that during operation, the first adhesive is injected from one end of the spring hose 5 until adhesive seeps out from the other end, ensuring that the through hole 6 is filled with adhesive. Let it stand for an appropriate time to cure, forming point anchoring points.

[0059] S14, Surface bonding: Depress the airbag 9 and pull it out of the spring hose 5; drip the second glue along the outer wall of the spring hose 5, the second glue flows naturally along the spiral line of the spring hose 5, fills the gap between the spring hose 5 and the inner wall of the steel pipe 7, and forms a continuous bonding layer after curing, thus achieving secondary reinforcement.

[0060] Repeat steps S11-S14 to complete the construction of multiple water pipe unit 1.

[0061] S2, On-site assembly:

[0062] Multiple water pipe units 1, manufactured in the factory, are transported to the construction site and connected in series according to design requirements to form a complete cooling water pipe system. Specifically:

[0063] According to the construction design drawings, the prefabricated water pipe unit 1 is transported to the site and can be connected in series using any of the following methods:

[0064] Welding connection: The ends of the adjacent steel pipes 7 are beveled, and the weld is ground after welding.

[0065] Flange connection: Pre-fabricated flanges are made at the 7-end of the steel pipe, and fastened with bolts. Rubber gaskets are added between the flanges for sealing.

[0066] Pipe section 8 connection: Select steel pipe sections with matching pipe diameter, apply sealant to the inner wall and then fit and fix them.

[0067] In addition, a pressure test is required after connection to ensure there are no leaks. During operation, cooling water is circulated inside the pipe, and the turbulence structure formed by the spiral protrusions disrupts the laminar sublayer, accelerating the removal of hydration heat.

[0068] Application results:

[0069] This invention, by installing a spring hose 5 inside the steel pipe 7, creates an uneven, turbulent surface on the originally smooth inner wall. When water flows through, the spiral protrusions formed by the spring hose 5 create a cutting-like disturbance to the water flow, fundamentally breaking through the thermal resistance bottleneck of the laminar flow layer in existing technologies. Ultimately, it enables heat to quickly penetrate the pipe wall and directly enter the core of the water flow, solving the fundamental problems of "slow heat dissipation and delayed temperature control" in traditional solutions. This significantly improves the efficiency of heat dissipation from the hydration inside concrete.

[0070] This invention overcomes thermal resistance structurally, eliminating the need for high flow rates or dense pipework. Under the same heat dissipation requirements, it effectively reduces pump power and pipe usage, while avoiding the impact of dense pipework on concrete structures.

[0071] Example 2:

[0072] like Figure 7 - Figure 11 As shown, based on Embodiment 1, the two ends of the spring hose 5 are respectively connected to a ring sleeve 10, which is fitted inside the steel pipe 7 and fixedly connected to the inner wall of the end of the steel pipe 7.

[0073] The sleeve 10 has a groove 11, and the end of the spring hose 5 is fitted into the groove 11. The thickness of the groove 11 is less than the diameter of the spring hose 5. The sleeve 10 can be a circular sleeve 10 made of the same material as the steel pipe 7. During assembly, the two ends of the spring hose 5 are respectively inserted into the grooves 11 of the two sleeves 10, and the two can be fixed together by adhesive.

[0074] This embodiment also proposes an assembly method for cooling water pipes in gravity dam construction based on disrupting the laminar sublayer. The specific process is as follows:

[0075] The other steps are the same as those in Embodiment 1, except that S1 also includes the installation ring 10, as detailed below:

[0076] A slot 11 is made on the ring 10, and the end of the spring hose 5 is fitted into the slot 11 and fixed. One of the rings 10 is slid in along the axis of the steel pipe 7, and the spring hose 5 is pulled by the ring 10. The spring hose 5 is automatically inserted into the steel pipe 7 by gravity. After insertion, the two rings 10 are positioned at the designed positions at the ends of the steel pipe 7 and welded to fix them.

[0077] During the inflation of the airbag 9, the ring 10 simultaneously serves a dual function of limiting protection and inflating status indication: on the one hand, the ring 10 can physically limit the maximum expansion range of the airbag, preventing the airbag 9 from being over-expanded and causing the spring hose 5 to be squeezed, deformed, or damaged; on the other hand, when the outer wall of the airbag 9 comes into contact with the inner wall of the ring 10, this contact state is an intuitive "stop inflation" signal - the operator can observe or use a simple contact sensor to judge this state and immediately stop inflation, which can accurately ensure that the spring hose 5 is appropriately flattened.

[0078] When water pipe units 1 with rings 10 are connected in series, the rings 10 can also play an additional role in assisting turbulence and compensating for unevenness. When water flows through the joint, it will first encounter the rings 10, and the originally smooth water flow will be blocked, forming a small-scale vortex. This can directly disperse any stagnant water film that may form at the joint, and form a relay turbulence with the spiral protrusions of the spring hose 5. That is, the spiral protrusions are responsible for the turbulence throughout the entire process, and the rings 10 are responsible for strengthening the turbulence at the joint, so that there are no weak points in the heat dissipation of the entire pipe. The presence of the rings 10 can prevent smooth sections from appearing at the joints of adjacent water pipe units 1, so that the inner wall of the entire cooling pipe (including the joint position) remains uneven.

[0079] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for assembling a gravity dam construction cooling water pipe based on destroying a laminar sublayer, for constructing a gravity dam construction cooling water pipe based on destroying a laminar sublayer, characterized in that, The gravity dam construction cooling water pipe based on the destruction of the bottom layer of laminar flow comprises a plurality of water pipe units (1) connected in series, the water pipe unit (1) comprises a steel pipe (7), a flexible spring hose (5) is arranged in the steel pipe (7), the spring hose (5) is fixedly connected with the inner wall of the steel pipe (7), the spring hose (5) is configured as a spiral protrusion along the inner wall of the steel pipe (7), so that the inner wall of the steel pipe (7) forms a concave-convex turbulence structure; a plurality of through holes (6) are arranged on the pipe wall of the spring hose (5) along the spiral line; the spring hose (5) is filled with first glue, the first glue flows out through the through holes (6) and is connected with the inner wall of the steel pipe (7), and a plurality of point type anchor points are formed after solidification; the outer wall of the spring hose (5) and the inner wall of the steel pipe (7) are fixedly connected through second glue, and a continuous reinforcing structure along the spiral line is formed; The assembly method comprises the following steps: S1, the water pipe unit (1) is manufactured in the factory: S11, the spring hose (5) is sleeved in the steel pipe (7): the spring hose (5) is pulled and stretched, so that the diameter of the spring hose (5) is reduced, and the spring hose (5) is smoothly inserted into the steel pipe (7); the spring hose (5) is arranged in the steel pipe (7); the spring hose (5) is loosened, and the spring hose (5) is tightly attached to the inner wall of the steel pipe (7) by using the elastic restoring force thereof; S12, the spring hose (5) is flattened and sealed with the through hole (6): the air bag (9) is sleeved in the spring hose (5), and the two ends of the air bag (9) extend out of the steel pipe (7); the air bag (9) is inflated, and as the air bag (9) expands, the spring hose (5) is flattened between the air bag (9) and the inner wall of the steel pipe (7); at this time, the through hole (6) on the spring hose (5) changes from "line contact" to "surface contact", and the through hole (6) is completely covered; S13, point type anchoring: the first glue is injected into the spring hose (5), the first glue flows out through the through hole (6) and contacts the inner wall of the steel pipe (7), and a plurality of point type anchor points are formed after solidification, so that the spring hose (5) and the inner wall of the steel pipe (7) are preliminarily fixed; S14, surface type bonding: the air bag (9) is deflated and taken out of the spring hose (5); the second glue is added along the outer wall of the spring hose (5), the second glue naturally flows along the spiral line of the spring hose (5), fills the gap between the spring hose (5) and the inner wall of the steel pipe (7), and realizes secondary reinforcement after solidification; Repeat S11-S14 to complete the manufacture of a plurality of water pipe units (1); S2, assemble at the construction site: The plurality of water pipe units (1) manufactured in the factory are transported to the construction site, and are connected in series according to the design requirements to form a complete cooling water pipe system.

2. The assembly method of the cooling water pipe for the gravity dam construction based on the destruction of the laminar sublayer according to claim 1, characterized in that, In S1, the mounting ring (10) is also included, and the specific method is as follows: A notch (11) is formed on the ring sleeve (10), the end of the spring hose (5) is embedded in the notch (11) and fixed; one of the ring sleeves (10) is slid along the axis of the steel pipe (7), the spring hose (5) is pulled through the ring sleeve (10), and the spring hose (5) is automatically arranged in the steel pipe (7) by gravity; after the arrangement, the two ring sleeves (10) are positioned at the designed positions of the ends of the steel pipe (7) and welded and fixed; When the air bag (9) is inflated, the ring sleeve (10) plays a limiting role; when the outer wall of the air bag (9) contacts the inner wall of the ring sleeve (10), the inflation is stopped, so that the spring hose (5) is moderately flattened, and excessive deformation and damage are avoided.

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