Steel pipe for spiral seam welded super-long pile

Abstract

The utility model relates to a steel pipe technical field especially spiral seam welded super long pile with steel pipe, including the pipe body, the pipe body spiral coil becomes tubular, has the spiral weld joint of welding fixation on the surface of pipe body, flange joint is provided with two and respectively welds and is sleeved in the both ends of pipe body, spiral ring is in the form of thread spiral coil and surrounds the outer wall of pipe body, and spiral ring is through the weld joint mode seal cover and is established in the spiral weld joint department of pipe body outer surface, the inside of spiral ring and the outer wall of pipe body form sealed gas storage cavity, the hoop is provided with multiple groups and is equidistantly sleeved in the outside of pipe body, gas inlet component installs one end of spiral ring outside and is connected with gas storage cavity, gas outlet component installs the other end of spiral ring outside and is connected with gas storage cavity, the utility model improves the corrosion resistance of weld joint and whole steel pipe, and then prolongs the service life of super long pile in complex severe service environment, reduces the maintenance cost and engineering safety hidden danger of later period.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe technology, and in particular to a steel pipe for spiral welded ultra-long piles. Background Technology

[0002] In the construction of large-scale infrastructure projects such as building construction, bridge construction, and port terminals, ultra-long piles serve as core load-bearing components, and their load-bearing performance and service life directly determine the safety and stability of the overall project. Spiral welded steel pipes, with their significant advantages such as high production efficiency and adaptability to large-diameter and ultra-long specifications, have become the mainstream choice for ultra-long piles. However, ultra-long piles often face complex and harsh service environments in practical applications, such as damp soil with high groundwater levels, saline marine atmospheres or groundwater, and corrosive media in industrial areas. These environmental factors can easily cause corrosion and damage to the critical structural components of the steel pipe.

[0003] Spiral welds are formed by welding processes. In long-term corrosive environments, external moisture, oxygen, corrosive ions, etc., can easily penetrate through the tiny defects of the weld, triggering metal oxidation reactions in the weld area, which in turn leads to weld corrosion and reduced strength. As corrosion continues to develop, the weld may experience problems such as leakage, cracking, or even breakage, seriously affecting the structural integrity and load-bearing capacity of ultra-long piles. This not only shortens the service life of the steel pipe but may also cause engineering safety hazards and increase later maintenance costs. Therefore, this application proposes a steel pipe for spiral welded ultra-long piles. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a steel pipe for spiral welded ultra-long piles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a steel pipe for spiral welded ultra-long piles, comprising: The tube body is spirally coiled into a tubular shape, and there are spiral welds fixed on the surface of the tube body. Two flange joints are provided and are welded and fitted onto both ends of the pipe body respectively; The spiral ring is spirally coiled around the outer wall of the tube body, and the spiral ring is sealed at the spiral weld on the outer surface of the tube body by welding. A sealed gas storage cavity is formed between the inner side of the spiral ring and the outer wall of the tube body. The clamps are provided in multiple sets and are equidistantly fitted onto the outside of the pipe body; The air intake assembly is installed at one end of the outer side of the spiral ring and communicates with the air storage chamber; The air outlet assembly is installed at the other end of the outer side of the spiral ring and is connected to the air storage chamber.

[0006] Furthermore, an integral outer ring and inner ring are fixedly installed on one side of the flange joint connecting the pipe body. The outer ring is sleeved on the outside of the pipe body and fits against its outer wall, while the inner ring is inserted into the inside of the pipe body and fits against its inner wall. The length of the inner ring is greater than that of the outer ring, and the thickness of the inner ring gradually decreases from the outside to the inside.

[0007] Furthermore, an annular sealing groove is provided on the side of the flange joint away from the pipe body, and a rubber sealing gasket is provided in the sealing groove. The thickness of the sealing gasket is greater than the depth of the sealing groove. Multiple through holes are provided in a circular array on the edge of the flange joint side, and a first bolt is inserted through each through hole.

[0008] Furthermore, the clamp is composed of two symmetrically distributed clamping rings spliced ​​together. The inner wall of the upper clamping ring has a notch that matches the spiral ring. A second bolt is inserted through the two ends of the two clamping rings, and anti-slip strips are provided at both ends of the inner wall of the two clamping rings.

[0009] Furthermore, the intake assembly includes a fixed tube, a sealing plug, a threaded cap, and a venting insert. The fixed tube is installed on the outer wall of the spiral ring and communicates with the air storage chamber. The venting insert is installed inside the fixed tube. The sealing plug is interference-fitted into the end of the fixed tube away from the air storage chamber. The threaded cap is threaded onto the outside of the fixed tube and compresses the sealing plug.

[0010] Furthermore, the ventilation plug includes a sealing tube, a positioning tube, a sealing plug, and a spring. The sealing tube is fixedly installed inside the fixed tube and has an inner cavity. The end of the inner cavity away from the air storage cavity has a funnel-shaped opening. The positioning tube is fixedly inserted into the end of the inner cavity away from the opening, and the end of the positioning tube away from the opening has an opening that communicates with the air storage cavity. Multiple air holes are provided on the side wall of the positioning tube. One end of the sealing plug has a slot, and the slot is movably fitted onto the end of the positioning tube away from the air storage cavity. The shape of the other end of the sealing plug is adapted to the opening, and the sealing plug can be inserted into the opening. The spring is sleeved on the outside of the positioning tube, and the two ends of the spring are respectively connected to the inner wall of the inner cavity and the end of the sealing plug with the slot.

[0011] Furthermore, the exhaust assembly and the intake assembly have the same structure, but the venting insert in the exhaust assembly is arranged in the opposite direction to the venting insert in the intake assembly.

[0012] The beneficial effects of this utility model are: The spiral weld seam on the pipe body surface is covered by a spiral ring in a welded sealing manner, forming a sealed air storage chamber. This effectively isolates the weld seam from direct contact with external humid environments, salt, corrosive ions and other corrosive media, preventing oxidation, leakage and cracking caused by minor defects in the weld seam. This significantly improves the corrosion resistance of the weld seam and the entire steel pipe, thereby extending the service life of ultra-long piles in complex and harsh service environments and reducing later maintenance costs and engineering safety hazards.

[0013] The flange joint adopts an integrated double-fit design of outer and inner rings. The inner ring extends deep into the pipe body and has a gradually changing thickness, while the outer ring fits the outside of the pipe body. With the rubber sealing gasket that is interference-fitted in the sealing groove, the sealing performance between steel pipes is greatly enhanced, preventing moisture and gas from entering through the connection gap. At the same time, multiple sets of equidistant clamps are fixed by splicing upper and lower clamping rings. The notch of the upper clamping ring is precisely matched with the spiral ring, which does not damage the sealing structure of the spiral ring, but also forms a uniform and stable clamping protection for the pipe body, reducing the risk of pipe deformation during transportation, installation and use.

[0014] The air inlet and outlet components employ a double-sealing structure of sealing plugs and threaded caps, combined with the automatic sealing design of the venting insert. In the non-venting state, the spring pushes the sealing plug to tightly fit the opening, achieving a reliable seal of the air storage chamber and preventing gas leakage or intrusion of external media. When air intake is required, external air pressure pushes the sealing plug to compress the spring, and gas enters the air storage chamber through the vent. When air exhaust is required, the air pressure inside the air storage chamber pushes the sealing plug to compress the spring, and gas exits the air storage chamber through the vent. This design ensures both sealing performance and flexible ventilation, allowing for pressure adjustment or media replacement within the air storage chamber as needed, further enhancing corrosion resistance. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a cross-sectional structural diagram of the flange joint of this utility model; Figure 4 This is a schematic diagram of the structure of the clamp of this utility model; Figure 5 This is a schematic diagram of the structure of the spiral ring, air intake assembly and air outlet assembly of this utility model; Figure 6 This is a cross-sectional structural diagram of the air intake assembly of this utility model; Figure 7 This is a cross-sectional structural diagram of the air outlet component of this utility model; Figure 8 This is a cross-sectional structural diagram of the connection between the sealing tube and the positioning tube of this utility model; In the picture: 1. Pipe body; 2. Flange joint; 3. Spiral ring; 4. Clamp; 5. Inlet assembly; 6. Outlet assembly; 11. Spiral weld; 21. Inner ring; 22. Outer ring; 23. Sealing groove; 24. Sealing gasket; 25. Through hole; 26. First bolt; 31. Gas storage chamber; 41. Clamping ring; 42. Notched groove; 43. Second bolt; 45. Anti-slip strip; 51. Fixed tube; 52. Sealing plug; 53. Threaded cap; 541. Sealing tube; 542. Inner cavity; 543. Through port; 544. Positioning tube; 545. Air hole; 546. Sealing plug; 547. Slot; 548. Spring. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please see Figures 1-8 This utility model provides a technical solution: a steel pipe for ultra-long spiral welded piles, comprising a pipe body 1, which is spirally coiled into a tubular shape, with a spiral weld 11 fixed on the surface of the pipe body 1. Two flange joints 2 are provided and welded to both ends of the pipe body 1 respectively. A spiral ring 3 is spirally coiled around the outer wall of the pipe body 1, and the spiral ring 3 is sealed at the spiral weld 11 on the outer surface of the pipe body 1 by welding. A sealed air storage cavity 31 is formed between the inner side of the spiral ring 3 and the outer wall of the pipe body 1. Multiple sets of clamps 4 are provided and equidistantly sleeved on the outside of the pipe body 1. An air intake assembly 5 is installed at one end of the outer side of the spiral ring 3 and connected to the air storage cavity. The gas chamber 31 is connected, and the gas outlet component 6 is installed on the other end of the spiral ring 3 and connected to the gas storage chamber 31. The spiral weld 11 is formed by spiraling the pipe body 1 and fixed by welding. Combined with the flange joint 2 welded at both ends, the spiral ring 3 that seals and covers the spiral weld 11 and forms the gas storage chamber 31, multiple sets of equidistant clamps 4, and the gas inlet component 5 and gas outlet component 6 connected to the gas storage chamber 31, a complete and functional overall design is constructed. The sealing and protection structure of the gas storage chamber 31 and the spiral ring 3 provides targeted protection for the spiral weld 11. At the same time, the flange joint 2 and the clamps 4 ensure the connection stability and the structural strength of the pipe body 1.

[0018] like Figure 2 and Figure 3As shown, an integral outer ring 22 and inner ring 21 are fixedly installed on one side of the flange joint 2 connected to the pipe body 1. The outer ring 22 is fitted around the outside of the pipe body 1 and fits against its outer wall. The inner ring 21 is inserted into the inside of the pipe body 1 and fits against its inner wall. The length of the inner ring 21 is greater than that of the outer ring 22, and the thickness of the inner ring 21 gradually decreases from the outside to the inside. The integral outer ring 22 and inner ring 21 fit against the outside of the pipe body 1 and are inserted into the inside, respectively. The inner ring 21 is longer, which allows the connection between the flange joint 2 and the pipe body 1 to be tighter, greatly improving the fit and connection firmness. It effectively prevents external corrosive media from entering from the connection between the flange joint 2 and the pipe body 1, significantly enhancing the sealing protection performance and structural stability of the end connection of the pipe body 1, and providing reliable end protection for the overall corrosion resistance and deformation resistance of the pipe body 1.

[0019] like Figure 2 and Figure 3 As shown, an annular sealing groove 23 is provided on the side of the flange joint 2 away from the pipe body 1. A rubber sealing gasket 24 is provided in the sealing groove 23, and the thickness of the sealing gasket 24 is greater than the depth of the sealing groove 23. Multiple through holes 25 are arranged in a circular array on the edge of the side of the flange joint 2. A first bolt 26 is inserted through each through hole 25. The rubber sealing gasket 24, which is interference fit in the annular sealing groove 23, can form a tight seal when the flange joint 2 is connected, completely blocking the path of moisture, corrosive ions, etc. to penetrate through the connection gap. The cooperation between the circular array of through holes 25 and the first bolt 26 can realize the firm splicing between multiple pipe bodies 1, which not only ensures the stability of the connection, but also further enhances the sealing performance of the flange joint 2 connection through the elastic sealing effect of the sealing gasket 24, ensuring the overall airtightness of the pipe body 1 after splicing, and adapting to the use requirements of connecting multiple pipe body 1 in ultra-long pile construction.

[0020] like Figure 2 and Figure 4 As shown, the clamp 4 is composed of two symmetrically distributed clamping rings 41 spliced ​​together. The inner wall of the upper clamping ring 41 has a notch 42 that matches the spiral ring 3. A second bolt 43 is inserted through both ends of the two clamping rings 41. Anti-slip strips 45 are provided at both ends of the inner wall of the two clamping rings 41. The splicing form of the symmetrical clamping rings 41 facilitates installation and disassembly. The notch 42 on the inner wall of the upper clamping ring 41 is precisely matched with the spiral ring 3, which can achieve a stable clamping of the pipe body 1 without damaging the sealing structure of the spiral ring 3. The second bolts 43 at both ends can realize the docking and fixing of the two clamping rings 41. The anti-slip strips 45 on the inner wall can increase the friction between the clamp 4 and the pipe body 1, effectively preventing the clamp 4 from sliding. Multiple sets of clamps 4 with equal spacing can form uniform protection for the pipe body 1 and strengthen the stability of the weld between the spiral ring 3 and the pipe body 1.

[0021] like Figure 6 , Figure 7 and Figure 8As shown, the air intake assembly 5 includes a fixed pipe 51, a sealing plug 52, a threaded cap 53, and a venting insert. The fixed pipe 51 is installed on the outer wall of the spiral ring 3 and communicates with the air storage chamber 31. The venting insert is installed inside the fixed pipe 51. The sealing plug 52 is interference-fitted into the end of the fixed pipe 51 away from the air storage chamber 31. The threaded cap 53 is threaded onto the outside of the fixed pipe 51 and compresses the sealing plug 52. The air intake assembly 5 achieves double sealing protection through the combined design of the fixed pipe 51, sealing plug 52, threaded cap 53, and venting insert. The fixed pipe 51 serves as a ventilation channel communicating with the air storage chamber 31. The sealing plug 52 is interference-fitted and compresses the threaded cap 53, achieving reliable sealing in non-ventilated conditions and preventing gas leakage or intrusion of external media into the air storage chamber 31. The venting insert provides a channel for air pressure regulation or media replacement in the air storage chamber 31, ensuring both reliable sealing and flexible ventilation functions. This lays the structural foundation for subsequent corrosion protection and strengthening through the air storage chamber 31.

[0022] like Figure 6 , Figure 7 and Figure 8 As shown, the venting insert includes a sealing tube 541, a positioning tube 544, a sealing plug 546, and a spring 548. The sealing tube 541 is fixedly installed inside the fixing tube 51. An inner cavity 542 is formed inside the sealing tube 541. A funnel-shaped opening 543 is formed at the end of the inner cavity 542 away from the air storage chamber 31. The positioning tube 544 is fixedly inserted into the end of the inner cavity 542 away from the opening 543, and the end of the positioning tube 544 away from the opening 543 has an opening communicating with the air storage chamber 31. Multiple air holes 545 are formed on the side wall of the positioning tube 544. A slot 547 is formed at one end of the sealing plug 546, and the slot 547 is movably fitted onto the end of the positioning tube 544 away from the air storage chamber 31. The shape of the other end of the sealing plug 546 is adapted to the opening 543, and the sealing plug 546 can be inserted into the opening 543. The spring 548... The spring 548 is sleeved on the outside of the positioning tube 544, and its two ends are respectively connected to the inner wall of the inner cavity 542 and the end of the sealing plug 546 with the slot 547. The inner cavity 542 of the sealing tube 541 and the funnel-shaped opening 543 form a reasonable airflow channel. The positioning tube 544 communicates with the gas storage chamber 31 through the opening and the air hole 545. Under the action of the spring 548, the sealing plug 546 can fit tightly against the opening 543 to achieve automatic sealing in the non-ventilated state and ensure the sealing effect. When it is necessary to inject inert gas into the gas storage chamber 31, the injected gas can push the sealing plug 546 to compress the spring 548, so that the gas can smoothly enter and exit the gas storage chamber 31 through the air hole 545. This not only ensures the sealing reliability of the gas storage chamber 31, but also makes the ventilation operation convenient and efficient, and can achieve gas pressure regulation or medium replacement in the gas storage chamber 31 without additional complicated operations.

[0023] like Figure 6 and Figure 7As shown, the structure of the air outlet component 6 is the same as that of the air inlet component 5. The venting plug in the air outlet component 6 is set in the opposite direction to the venting plug in the air inlet component 5, forming a bidirectional ventilation circuit in the air storage chamber 31. This allows the gas to smoothly enter from the air inlet component 5 and exit from the air outlet component 6, ensuring more efficient and uniform gas pressure regulation and medium replacement in the air storage chamber 31, and avoiding problems such as gas stagnation or poor flow.

[0024] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steel pipe for a spiral seam welded super-long pile, characterized by, include: The tube body (1) is spirally coiled into a tube shape, and there is a spiral weld (11) fixed on the surface of the tube body (1). Flange joints (2) are provided in two and are welded to both ends of the pipe body (1); The spiral ring (3) is spirally coiled around the outer wall of the tube body (1) and the spiral ring (3) is sealed on the spiral weld (11) on the outer surface of the tube body (1) by welding. A sealed gas storage cavity (31) is formed between the inner side of the spiral ring (3) and the outer wall of the tube body (1). Clamps (4) are provided in multiple sets and are equidistantly fitted on the outside of the pipe body (1); The intake assembly (5) is installed at one end of the outer side of the spiral ring (3) and communicates with the air storage chamber (31); The air outlet assembly (6) is installed on the other end of the spiral ring (3) and communicates with the air storage chamber (31).

2. A steel pipe for a spiral seam welded super-long pile according to claim 1, characterized in that, The flange joint (2) is fixedly installed with an integral outer ring (22) and inner ring (21) on one side of the pipe body (1). The outer ring (22) is sleeved on the outside of the pipe body (1) and fits against its outer wall. The inner ring (21) is inserted into the inside of the pipe body (1) and fits against its inner wall. The length of the inner ring (21) is greater than that of the outer ring (22), and the thickness of the inner ring (21) gradually decreases from the outside to the inside.

3. The steel pipe for spiral welded ultra-long piles according to claim 1, characterized in that, The flange joint (2) has an annular sealing groove (23) on the side away from the pipe body (1). A rubber sealing gasket (24) is provided in the sealing groove (23), and the thickness of the sealing gasket (24) is greater than the depth of the sealing groove (23). Multiple through holes (25) are arranged in a circular array at the edge of the side of the flange joint (2), and a first bolt (26) is inserted through each through hole (25).

4. A steel pipe for a spiral seam welded super-long pile according to claim 1, characterized by The clamp (4) is composed of two symmetrically distributed clamping rings (41) spliced ​​together. The inner wall of the upper clamping ring (41) is provided with a notch (42) that matches the spiral ring (3). A second bolt (43) is inserted through the two ends of the two clamping rings (41). Anti-slip strips (45) are provided at both ends of the inner wall of the two clamping rings (41).

5. A steel pipe for a spiral seam welded super-long pile according to claim 1, characterized by The air intake assembly (5) includes a fixed tube (51), a sealing plug (52), a threaded cap (53), and a venting insert. The fixed tube (51) is installed on the outer wall of the spiral ring (3) and communicates with the air storage chamber (31). The venting insert is installed inside the fixed tube (51). The sealing plug (52) is interference-fitted into the end of the fixed tube (51) away from the air storage chamber (31). The threaded cap (53) is threaded onto the outside of the fixed tube (51) and compresses the sealing plug (52).

6. A steel pipe for use in a spiral seam welded super-long pile according to claim 5, characterized in that, The ventilation insert includes a sealing tube (541), a positioning tube (544), a sealing plug (546), and a spring (548). The sealing tube (541) is fixedly installed inside the fixing tube (51). The sealing tube (541) has an inner cavity (542) inside. The end of the inner cavity (542) away from the air storage cavity (31) has a funnel-shaped opening (543). The positioning tube (544) is fixedly inserted into the end of the inner cavity (542) away from the opening (543), and the end of the positioning tube (544) away from the opening (543) has an opening communicating with the air storage cavity (31). The sidewall of the tube (544) is provided with multiple air holes (545). One end of the sealing plug (546) is provided with a slot (547), and the slot (547) is movably sleeved on the end of the positioning tube (544) away from the air storage chamber (31). The shape of the other end of the sealing plug (546) is adapted to the opening (543), and the sealing plug (546) can be inserted into the opening (543). The spring (548) is sleeved on the outside of the positioning tube (544), and the two ends of the spring (548) are respectively connected to the inner wall of the inner cavity (542) and the end of the sealing plug (546) with the slot (547).

7. A steel pipe for use in a spiral seam welded super-long pile according to claim 6, characterized in that, The air outlet assembly (6) has the same structure as the air inlet assembly (5), and the air outlet plug in the air outlet assembly (6) is arranged in the opposite direction to the air inlet assembly (5).

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