Anti-compression and anti-deformation engineering steel pipe for municipal engineering

Abstract

The invention relates to the technical field of steel pipes, and particularly discloses a compression-resistant and deformation-resistant engineering steel pipe for municipal engineering, which comprises a pipe main body, and the pipe main body sequentially comprises a first pipe sleeve, a composite layer and a second pipe sleeve from inside to outside; the composite layer comprises a concrete pouring layer filled between the first pipe sleeve and the second pipe sleeve, and a hollow pipe and a prestressed steel strand are pre-buried in the concrete pouring layer; the second pipe sleeve is connected with annular reinforcing ribs through elastic connecting arms, the annular reinforcing ribs are distributed at intervals in the axial direction of the pipe body main body, tension bars are connected between the adjacent annular reinforcing ribs, and self-tightening anchorage devices are arranged between the annular reinforcing ribs and the prestressed steel strands. A dynamic prestress compensation mechanism composed of a prestress steel strand, a self-tightening anchorage device, a floating plate, a dynamic rod and a second spring is combined, and meanwhile cooperative supporting of an annular reinforcing rib and a tension rod is matched, so that the technical defects that a traditional steel pipe is insufficient in anti-pressure capacity, prestress is prone to loosening and the like are effectively overcome.

Description

Technical Field

[0001] This invention relates to the field of steel pipe technology, specifically to an engineering steel pipe for municipal engineering that is resistant to pressure and deformation. Background Technology

[0002] In municipal engineering construction, steel pipes serve as core components in key areas such as water supply and drainage, gas transmission, heating pipelines, and bridge support structures. Their performance directly affects the safety and lifespan of urban infrastructure. With the acceleration of urbanization and the intensive development of underground space, municipal engineering steel pipes face increasingly complex service environments, including multiple challenges such as deep burial soil pressure, heavy traffic dynamic loads, uneven foundation settlement, and groundwater corrosion.

[0003] Under long-term external static loads (such as soil pressure) and dynamic loads (such as vehicle traffic), traditional thin-walled steel pipes are prone to elliptic deformation or local buckling, resulting in a reduction in the effective cross-sectional area of ​​the pipe, a decrease in fluid transport efficiency, and in severe cases, even structural failure. In addition, when encountering earthquakes or foundation settlement, the flexibility and stiffness of the pipe are difficult to balance, making it extremely prone to plastic deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure-resistant and deformation-resistant engineering steel pipe for municipal engineering, in order to solve the problem mentioned in the background art that thin-walled steel pipes are prone to elliptic deformation or local buckling, which leads to a reduction in the effective area of ​​the pipe cross-section, a decrease in fluid transport efficiency, and even structural failure in severe cases.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pressure- and deformation-resistant engineering steel pipe for municipal engineering includes a main body. The main body comprises, from the inside out, a first sleeve, a composite layer, and a second sleeve. The first sleeve has two connecting ends, and each end has an annular mounting groove and connecting holes evenly distributed along the annular mounting groove. The composite layer includes a concrete pouring layer filling the space between the first and second sleeves. A hollow tube is embedded within the concrete pouring layer, and prestressed steel strands are threaded through the hollow tubes. The two ends of the prestressed steel strands are connected to the first sleeve. The second sleeve has annular reinforcing ribs connected by elastic connecting arms. The annular reinforcing ribs are spaced apart along the axial direction of the main body, and tension bars connect adjacent annular reinforcing ribs. Self-tightening anchors are provided between the annular reinforcing ribs and the prestressed steel strands.

[0006] Preferably, limit rings are fixedly installed inside both ends of the hollow tube, and both ends of the prestressed steel strand pass through the limit rings and are fixedly connected to anchor plates. A first spring is fixedly connected between the anchor plates and the limit rings.

[0007] Preferably, sealing gaskets are installed in the annular mounting grooves at both ends.

[0008] Preferably, the self-tightening anchor includes a pressure rod slidably connected to the second sleeve and a locking block fixedly installed on the prestressed steel strand, wherein both the pressure rod and the locking block have contact slopes.

[0009] Preferably, the self-tightening anchor further includes a float plate, and a secondary groove is formed on the bottom surface of the annular mounting groove. The float plate is slidably connected in the secondary groove, and an anchor hole is formed on the bottom surface of the secondary groove. A dynamic rod is fixedly installed on the float plate, the dynamic rod passes through the anchor hole and is located in the hollow tube, and a positioning pin is fixedly installed on the float plate. A positioning groove that matches the positioning pin is formed on the inner side wall of the secondary groove.

[0010] Preferably, a second spring is sleeved on the dynamic rod, and the two ends of the second spring are fixed to the stepped surface of the hollow tube and the stepped surface of the dynamic rod, respectively.

[0011] Preferably, the outer wall of the second sleeve is provided with a corrugated structure, and the annular reinforcing rib is elastically suspended at the trough of the corrugated structure through an elastic connecting arm, and the annular reinforcing rib is in contact with the self-tightening anchor.

[0012] Preferably, the annular reinforcing rib has a segmented structure, consisting of at least two arc-shaped reinforcing segments spaced apart end to end, with an expansion gap between adjacent arc-shaped reinforcing segments.

[0013] Preferably, the arc-shaped reinforcing section is a hollow structure filled with magnetorheological fluid, and an electromagnetic coil is wound around the outer wall of the arc-shaped reinforcing section. Adjacent electromagnetic coils are connected in series by flexible wires with reserved redundant lengths.

[0014] Preferably, the outer surface of the second sleeve is coated with a wear-resistant coating, and the inner wall of the first sleeve is coated with an anti-corrosion layer.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a multi-layer structure of "first sleeve - composite layer - second sleeve" in the main body of the pipe, combined with prestressed steel strands, self-tightening anchors and a dynamic prestress compensation mechanism composed of floating plate - dynamic rod - second spring, and with the coordinated support of annular reinforcing ribs and tension rods, the technical defects of traditional steel pipes, such as insufficient compressive strength, easy relaxation of prestress, unreliable connection sealing and poor structural stability, can be effectively solved. It can significantly improve the compressive and deformation resistance of steel pipes through the composite layer and prestressing system, and can achieve continuous and stable maintenance of prestress through the dynamic compensation mechanism and self-tightening anchors. Furthermore, through the design of the anti-corrosion layer of the first sleeve, the wear-resistant coating of the second sleeve and the sealing gasket, corrosion resistance, wear resistance and connection sealing are taken into account, extending the service life of steel pipes and adapting to complex municipal engineering conditions.

[0016] 2. By setting a sinusoidal corrugated structure on the outer wall of the second sleeve, and designing the annular reinforcing rib as a four-lobed structure, which is suspended at the trough of the corrugation by an elastic connecting arm, combined with the multiple protection design of magnetorheological fluid, electromagnetic coil and flexible wire, the adaptive switching of the load-bearing mode and uniform load transfer are realized. This effectively solves the technical defects of traditional steel pipes, such as poor load adaptability, local stress concentration and easy structural damage. Under light load, the magnetorheological fluid provides liquid buffering, and under larger load, it provides solidified rigid bearing. At the same time, the linkage self-tightening anchor realizes the real-time compensation of prestress, taking into account both buffering and bearing performance, and extending the service life and working reliability of the steel pipe in complex municipal working conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the first sleeve structure of the present invention; Figure 3 This is a schematic diagram of the connection end structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the tube body of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the main body of the tube of the present invention; Figure 6 This is a schematic diagram of the planar structure of the self-tightening anchor of the present invention; Figure 7 This is a schematic diagram of the annular reinforcing rib structure of the present invention; Figure 8 This is a schematic diagram of the installation of the electromagnetic coil of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 10. Pipe body; 11. First sleeve; 111. Connecting end; 112. Annular mounting groove; 113. Connecting hole; 114. Sealing gasket; 115. Secondary groove; 116. Anchor hole; 117. Positioning groove; 12. Composite layer; 121. Concrete pouring layer; 122. Hollow pipe; 123. Prestressed steel strand; 124. Limiting ring; 125. Anchor plate; 126. First spring; 13. Second sleeve; 20. Circular reinforcing rib; 21. Flexible connecting arm; 22. Arc-shaped reinforcing section; 23. Electromagnetic coil; 30. Tension bar; 40. Self-tightening anchor; 41. Pressure bar; 42. Locking block; 43. Float; 431. Positioning pin; 44. Dynamic rod; 45. Second spring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Refer to Figure 1 - Figure 8 A pressure- and deformation-resistant engineering steel pipe for municipal engineering includes a main pipe body 10. The main pipe body 10 comprises, from the inside out, a first sleeve 11, a composite layer 12, and a second sleeve 13. The inner wall of the first sleeve 11 is coated with an anti-corrosion layer made of epoxy resin-based material and applied using a high-pressure airless spraying process. This effectively isolates the steel pipe from the corrosion of moisture and chemical media, thereby extending its service life. The outer surface of the second sleeve 13 is coated with a wear-resistant coating prepared using a supersonic flame spraying process. The coating's main components are tungsten carbide and nickel-based alloys, exhibiting extremely high hardness and good impact resistance, making it suitable for long-term use under heavy traffic or harsh environmental conditions. In operation, the second sleeve 13, the first sleeve 11, and the composite layer 12 work together to bear external loads. Specifically, the first sleeve 11 provides reliable sealing and ease of installation through its inner anti-corrosion layer and precise connection structure; the composite layer 12, through the reinforcement of the concrete pouring layer 121 by the prestressed steel strands 123, gives the pipe body 10 excellent compressive strength; and the second sleeve 13, with its high strength and wear-resistant properties, provides an additional protective layer for the entire pipe body, further improving the adaptability and service life of the pipe body 10 under complex working conditions.

[0021] Specifically, refer to Figure 2The first sleeve 11 has two ends as connection ends 111. The two ends of the first sleeve 11 are provided with annular mounting grooves 112 and connection holes 113 evenly distributed along the annular mounting grooves 112. Furthermore, sealing gaskets 114 are installed in the annular mounting grooves 112 at both ends to achieve waterproof sealing when adjacent pipes are connected. The connection holes 113 are connected by bolts to enhance the connection strength and stability between pipes, which is suitable for installation requirements under complex working conditions.

[0022] Specifically, refer to Figure 4 and Figure 5 and Figure 6 The composite layer 12 includes a concrete pouring layer 121 filled between the first pipe sleeve 11 and the second pipe sleeve 13. Hollow tubes 122 are pre-embedded in the concrete pouring layer 121. These hollow tubes 122 are evenly distributed along the pipe body axis. Prestressed steel strands 123 are threaded through the hollow tubes 122. The two ends of the prestressed steel strands 123 are connected to the first pipe sleeve 11 to form a pre-compression stress distribution on the concrete pouring layer 121. This composite layer 12 structure not only significantly improves the overall rigidity of the pipe body 10, but also effectively offsets the tensile stress caused by external loads through the prestressing effect, thereby greatly enhancing the compressive and deformation resistance of the pipe body 10.

[0023] The second sleeve 13 is connected to annular reinforcing ribs 20 via elastic connecting arms 21. The annular reinforcing ribs 20 are spaced apart along the axial direction of the main body 10. A tension rod 30 is connected between adjacent annular reinforcing ribs 20. The axial constraint of the tension rod 30 further improves the deformation resistance of the main body 10 under radial pressure. A self-tightening anchor 40 is provided between the annular reinforcing ribs 20 and the prestressed steel strands 123. The self-tightening anchor 40 is used to suppress the relaxation of the prestressed steel strands 123 under external load, thereby ensuring the continuous action of prestress.

[0024] During the operation of the engineering steel pipe, the prestressed steel strands 123 generate pre-compressive stress through tension, thereby significantly improving the overall compressive strength of the pipe body 10. Specifically, during the manufacturing stage, the prestressed steel strands 123 are arranged in the hollow tube 122 within the composite layer 12, and axial tension is applied to them through a tensioning process. According to the principles of mechanics of materials, this tension will generate tensile stress inside the prestressed steel strands 123, and simultaneously, through the bonding effect between the hollow tube 122 and the concrete pouring layer 121, the tensile stress is transferred to the concrete and the pipe body 10 structure. When the pipe body 10 is subjected to external loads, such as axial pressure or bending stress, the pre-compressive stress applied by the prestressed steel strands 123 can effectively offset part or all of the tensile stress caused by the external load, thereby reducing the risk of plastic deformation of the pipe body 10. In addition, the presence of prestress ensures that the main body 10 of the pipe maintains a certain compressive stress state during the stress process. This compressive stress distribution not only improves the compressive bearing capacity of the main body 10 of the pipe, but also delays the generation and propagation of microcracks, thereby enhancing the durability of the structure.

[0025] The first sleeve 11, as the inner structure of the main body 10, primarily functions to provide excellent corrosion resistance and reliable connections. By coating its inner wall with an anti-corrosion layer, the first sleeve 11 effectively resists the erosion of environmental media, thereby extending the service life of the main body 10. Simultaneously, the annular mounting grooves 112 and connecting holes 113 at both ends facilitate the installation of the sealing gasket 114 and the connection between pipe sections, ensuring the waterproof and sealing performance of the main body 10 during long-term use.

[0026] The composite layer 12, as the core structural component of the main body 10, consists of a concrete pouring layer 121, a pre-embedded hollow tube 122, and prestressed steel strands 123. The concrete pouring layer 121 bears most of the external load due to its high compressive strength, while the prestressed steel strands 123 further enhance the load-bearing capacity of the composite layer 12 through the application of prestress. Furthermore, the hollow tube 122 not only provides space for the arrangement of the prestressed steel strands 123 but also reduces the self-weight of the concrete pouring layer 121, thereby optimizing the overall performance of the main body 10.

[0027] The second sleeve 13, serving as the outer layer of the main body 10, provides additional protection for the main body 10 through its high-strength and wear-resistant coating. The wear-resistant coating significantly reduces the abrasive effects of external environmental factors on the surface of the main body 10, thereby improving its durability. Simultaneously, the second sleeve 13, together with the first sleeve 11 and the composite layer 12, forms a synergistic working mechanism through close cooperation, ensuring that external loads are evenly distributed throughout the entire main body 10 structure, preventing localized stress concentration.

[0028] The annular reinforcing ribs 20 and tension bars 30, as auxiliary structures of the main body 10, play a crucial role in improving overall stability. The annular reinforcing ribs 20 are connected to the second sleeve 13 via elastic connecting arms 21, forming multiple closed annular structures. These annular structures effectively disperse external loads, thereby improving the bending resistance of the main body 10. The tension bars 30, by connecting adjacent annular reinforcing ribs 20, further enhance the longitudinal stability of the main body 10, preventing structural instability caused by external loads. Furthermore, the self-tightening anchors 40 play a key role in maintaining prestress stability and the compactness of the main body 10 structure. Through their unique design, the self-tightening anchors 40 can automatically adjust the magnitude of the prestress during the stress process of the main body 10, thereby ensuring that the main body 10 is always in an optimal stress state.

[0029] Reference Figure 6 Limiting rings 124 are fixedly installed inside both ends of the hollow tube 122. Both ends of the prestressed steel strand 123 pass through the limiting rings 124 and are fixedly connected to anchor plates 125. A first spring 126 is fixedly connected between the anchor plates 125 and the limiting rings 124.

[0030] During the manufacturing of the main body 10, the prestressed steel strands 123 are not initially taut. The slack prestressed steel strands 123 are first passed through the hollow tube 122. A tensioning device is used to clamp the steel strands and pull them outward. When the prestressed steel strands 123 are stretched to the designed length, they are immediately locked at the end with an anchor plate 125. After the tensioning device is removed, the prestressed steel strands 123 try to retract, but are held in place by the anchor plate 125, thus maintaining a huge tension at all times.

[0031] The self-tightening anchor 40 includes a pressure rod 41 slidably connected to the second sleeve 13 and a locking block 42 fixedly installed on the prestressed steel strand 123. Both the pressure rod 41 and the locking block 42 have contact slopes.

[0032] When an external load is applied to the annular reinforcing rib 20, the annular reinforcing rib 20 will experience a decrease in force. Since the pressure rod 41 and the locking block 42 have a matching contact slope, the axial movement of the pressure rod 41 will be converted into the radial displacement of the locking block 42. The radial displacement of the locking block 42 pulls the prestressed steel strand 123, and the prestressed steel strand 123 is tightened. At the moment when the pipeline deforms, the prestress immediately increases, directly resisting the deformation trend.

[0033] The self-tightening anchor 40 also includes a float plate 43. The bottom surface of the annular mounting groove 112 is provided with a secondary groove 115. The float plate 43 is slidably connected in the secondary groove 115. An anchor hole 116 is provided in the bottom surface of the secondary groove 115. A dynamic rod 44 is fixedly installed on the float plate 43. The dynamic rod 44 passes through the anchor hole 116 and is located in the hollow tube 122. A positioning pin 431 is fixedly installed on the float plate 43. A positioning groove 117 that matches the positioning pin 431 is provided on the inner side wall of the secondary groove 115.

[0034] Furthermore, a second spring 45 is sleeved on the dynamic rod 44, and the two ends of the second spring 45 are fixed to the stepped surface of the hollow tube 122 and the stepped surface of the dynamic rod 44, respectively.

[0035] When the pipeline is installed at the construction site, adjacent pipe sections are joined and the sealing gasket 114 is squeezed. The sealing gasket 114 is compressed and generates an outward rebound force. This pressure acts directly on the outer end face of the float plate 43. After the pipeline is buried and put into service, external soil pressure, vehicle load, internal water pressure and other factors act on the pipe body, causing the annular reinforcing rib 20 to undergo slight deformation. This causes the pressure rod 41 to press down and drive the locking block 42 through the inclined plane, achieving immediate self-tightening under force. At the same time, the sealing pressure at the connection point is always present, the float plate 43 is continuously pressed into the secondary groove 115, the second spring 45 remains in a compressed state, and the dynamic rod 44 continuously provides tension to the prestressed steel strand 123, so that the steel strand will not loosen due to concrete creep and steel creep.

[0036] When uneven settlement of the foundation or seismic disturbance causes the pipeline to undergo tensile, bending or radial deformation, a slight gap change trend will appear at the pipe connection. If the pressure at the interface decreases instantaneously, the pressure of the sealing gasket 114 on the float 43 will decrease, the second spring 45 will release elastic potential energy, and push the dynamic rod 44 to move outward. The dynamic rod 44 will drive the float 43 to slide outward. At the same time, the annular reinforcing rib 20 will be subjected to excessive force, and the anchor plate 125 will displace too much synchronously, pushing the dynamic rod 44, causing the float 43 to produce a slight displacement and squeeze the sealing gasket 114, further realizing instant self-tightening under force.

[0037] Example 2: Refer to Figure 4 - Figure 8 The second sleeve 13 serves as the outer protective and force-bearing auxiliary structure of the pipe body. Its outer wall is provided with a corrugated structure in the shape of a regular sine wave. The annular reinforcing rib 20 is elastically suspended at the trough of the corrugated structure through the elastic connecting arm 21. The annular reinforcing rib 20 is in contact with the self-tightening anchor 40.

[0038] The inner wall of the annular reinforcing rib 20 contacts the top of the pressure rod 41 of the self-tightening anchor 40, forming a movable fit. When the annular reinforcing rib 20 is displaced by an external load, it can directly act on the pressure rod 41 of the self-tightening anchor 40, driving the self-tightening anchor 40 to start working and realize the instant self-tightening of prestress. It works in synergy with the working logic of the self-tightening anchor 40 in Embodiment 1. At the same time, combined with the elasticity of the corrugated structure, it achieves dual protection of elastic buffering and prestressed self-tightening.

[0039] The annular reinforcing rib 20 has a segmented structure, consisting of at least two arc-shaped reinforcing segments 22 spaced apart end to end. In this embodiment, there are four arc-shaped reinforcing segments 22, evenly distributed along the circumference of the tube. There is a telescopic gap between adjacent arc-shaped reinforcing segments 22. This gap can adaptively expand and contract according to the size of the external load and the deformation range of the tube, avoiding stress concentration caused by rigid collision at the splicing point of the segmented structure, and providing space for the radial displacement of the arc-shaped reinforcing segments 22. Each arc-shaped reinforcing segment 22 is a hollow structure, filled with magnetorheological fluid. The magnetorheological fluid is a nanoscale magnetorheological material with high magnetic permeability and low viscosity. It is liquid under normal conditions and has good fluidity. It can solidify instantly under the action of an external magnetic field, exhibiting high shear strength and rigidity, realizing a rapid switch from liquid buffering to solid load bearing. The outer wall of the arc-shaped reinforcing segment 22 is wound with an electromagnetic coil 23. Adjacent electromagnetic coils 23 are connected in series by flexible wires with reserved redundant length to avoid the wires being pulled and broken.

[0040] After the main body 10 is installed, it is in a normal stress balance state. The corrugated structure of the second sleeve 13 is naturally extended, and the elastic connecting arm 21 is in a preset slightly bent state, providing stable suspension support for each arc-shaped reinforcing section 22. This ensures that the segmented annular reinforcing rib 20 and the trough of the second sleeve 13 maintain a gap, and the expansion gap between adjacent arc-shaped reinforcing sections 22 is at the initial width, avoiding stress concentration caused by rigid contact of the structure under normal conditions. The annular reinforcing rib 20 is in light contact with the pressure rod 41 of the self-tightening anchor 40, and the self-tightening anchor 40 is in a standby state. The prestressed steel strands 123 in the composite layer 12 maintain a preset preload, so that the entire pipe body is in a compressed state. The electromagnetic coil 23 is in a de-energized state, and the magnetorheological fluid inside the arc-shaped reinforcing section 22 is in a liquid state with good fluidity, preparing to buffer minor external loads.

[0041] When the external radial pressure increases, such as deep soil pressure or dynamic load from heavy vehicles, and the pressure reaches a preset threshold, the electromagnetic coil 23 is automatically energized (which can be triggered by a pressure sensor, which is embedded in the outer wall of the arc-shaped reinforcing section 22), generating a uniform magnetic field that acts on the magnetorheological fluid inside the arc-shaped reinforcing section 22. The magnetorheological fluid solidifies instantly under the action of the magnetic field, exhibiting high shear strength and rigidity, making each arc-shaped reinforcing section 22 a rigid load-bearing unit, thereby making the segmented annular reinforcing rib 20 form a rigid annular structure as a whole, greatly improving the compressive bearing capacity.

[0042] The cured magnetorheological fluid can effectively transfer the load. The annular reinforcing rib 20, as a rigid support component, bears most of the radial pressure and transmits the pressure evenly to the trough of the second sleeve 13 through the circumferentially distributed elastic connecting arms 21, further absorbing the pressure energy and realizing the synergistic effect of rigid bearing and flexible buffering. This avoids the pressure from concentrating in the local area of ​​the tube body and effectively prevents the second sleeve 13 from undergoing local buckling and elliptic deformation.

[0043] When the external load continues to increase, or when the foundation settlement causes radial deformation of the pipe, each arc-shaped reinforcing section 22 will be subjected to greater pressure and undergo slight radial displacement. At this time, the arc-shaped reinforcing section 22 will press down on the pressure rod 41 of the corresponding self-tightening anchor 40. Since the pressure rod 41 and the locking block 42 of the self-tightening anchor 40 have mutually cooperating contact inclined surfaces, the axial displacement of the pressure rod 41 will be converted into the radial displacement of the locking block 42. The locking block 42 pulls the prestressed steel strand 123, making the steel strand further tightened, and the prestress increases immediately. The reverse tension of the prestress offsets part of the external pressure, delaying the further development of pipe deformation, and realizing the linkage effect of "load increase → prestress automatic compensation". During this process, the magnetorheological fluid remains in a solidified state to ensure the rigid bearing capacity of the annular reinforcing rib 20. At the same time, the redundant length of the flexible conductor can adapt to the displacement of the arc-shaped reinforcing section 22, avoiding the conductor from being pulled and broken, and ensuring the continuous and stable operation of the electromagnetic coil 23.

[0044] It should be noted that the flexible conductor, as the core component for power supply and series connection of the electromagnetic coil 23, directly affects the working stability of the magnetorheological structure. The main body 10 is often used in underground soil and humid environments, and is easily affected by construction disturbances, soil friction, and collisions with debris. Therefore, comprehensive protection of the flexible conductor is essential. Specific protection measures and reasons are as follows: First, the silicone sheath of the flexible conductor itself possesses basic wear resistance, corrosion resistance, and waterproof properties, which can initially isolate the conductor from the erosion of moisture and acid / alkali media in the soil, preventing oxidation of the conductor. Short circuit; secondly, along the laying path of the flexible conductor, namely the outer wall of the arc-shaped reinforcing section 22 and the gaps between adjacent arc-shaped reinforcing sections 22, wear-resistant and waterproof sleeves are used to further isolate the conductor from damage caused by soil friction and sharp debris, preventing the conductor from being exposed after the sheath is damaged; finally, the redundant part of the flexible conductor at the expansion gap is wrapped with a retractable corrugated tube. The corrugated tube can expand and contract synchronously with the displacement of the arc-shaped reinforcing section 22, which not only protects the redundant conductor from being pulled or bent excessively, but also prevents soil particles from entering the conductor connection, ensuring the conductivity of the series circuit. Through the above multiple protection measures, the service life of the flexible conductor can be effectively extended, avoiding the de-energization of the electromagnetic coil 23 and the inability of the magnetorheological fluid to solidify or liquefy properly due to conductor damage, thereby ensuring the stable performance of the self-adaptive load-bearing function of the segmented annular reinforcing rib 20.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of engineering steel pipe for municipal engineering that is resistant to pressure and deformation, characterized in that, The tube body (10) includes a first sleeve (11), a composite layer (12), and a second sleeve (13) from the inside to the outside. The two ends of the first sleeve (11) are connection ends (111). The two ends of the first sleeve (11) are provided with annular mounting grooves (112) and connection holes (113) evenly distributed along the annular mounting grooves (112). The composite layer (12) includes a concrete pouring layer (121) filled between the first sleeve (11) and the second sleeve (13), a hollow tube (122) is pre-embedded in the concrete pouring layer (121), and a prestressed steel strand (123) is threaded through the hollow tube (122), with both ends of the prestressed steel strand (123) connected to the first sleeve (11); The second sleeve (13) is connected to an annular reinforcing rib (20) by an elastic connecting arm (21). The annular reinforcing rib (20) is distributed at intervals along the axial direction of the main body (10). A tension rod (30) is connected between adjacent annular reinforcing ribs (20). A self-tightening anchor (40) is provided between the annular reinforcing rib (20) and the prestressed steel strand (123).

2. The engineering steel pipe for municipal engineering that is resistant to compression and deformation according to claim 1, characterized in that, Limiting rings (124) are fixedly installed inside both ends of the hollow tube (122). Both ends of the prestressed steel strand (123) pass through the limiting rings (124) and are fixedly connected to anchor plates (125). A first spring (126) is fixedly connected between the anchor plates (125) and the limiting rings (124).

3. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 1, characterized in that, Sealing gaskets (114) are installed in the annular mounting grooves (112) at both ends.

4. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 1, characterized in that, The self-tightening anchor (40) includes a pressure rod (41) slidably connected to the second sleeve (13) and a locking block (42) fixedly installed on the prestressed steel strand (123). Both the pressure rod (41) and the locking block (42) have contact slopes.

5. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 4, characterized in that, The self-tightening anchor (40) also includes a float plate (43). The bottom surface of the annular mounting groove (112) is provided with a secondary groove (115). The float plate (43) is slidably connected in the secondary groove (115). An anchor hole (116) is provided in the bottom surface of the secondary groove (115). A dynamic rod (44) is fixedly installed on the float plate (43). The dynamic rod (44) passes through the anchor hole (116) and is located in the hollow tube (122). A positioning pin (431) is fixedly installed on the float plate (43). A positioning groove (117) that matches the positioning pin (431) is provided on the inner side wall of the secondary groove (115).

6. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 5, characterized in that, A second spring (45) is sleeved on the dynamic rod (44), and the two ends of the second spring (45) are fixed to the stepped surface of the hollow tube (122) and the stepped surface of the dynamic rod (44), respectively.

7. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 1, characterized in that, The outer wall of the second sleeve (13) is provided with a corrugated structure. The annular reinforcing rib (20) is elastically suspended at the trough of the corrugated structure through the elastic connecting arm (21). The annular reinforcing rib (20) is in contact with the self-tightening anchor (40).

8. The compression-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 7, characterized in that, The annular reinforcing rib (20) is a segmented structure, consisting of at least two arc-shaped reinforcing segments (22) spaced apart end to end, with an expansion gap between adjacent arc-shaped reinforcing segments (22).

9. A pressure-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 8, characterized in that, The arc-shaped reinforcing section (22) is a hollow structure filled with magnetorheological fluid. The outer wall of the arc-shaped reinforcing section (22) is wound with an electromagnetic coil (23). Adjacent electromagnetic coils (23) are connected in series by flexible wires with reserved redundant length.

10. A pressure-resistant and deformation-resistant engineering steel pipe for municipal engineering according to claim 1, characterized in that, The outer surface of the second sleeve (13) is coated with a wear-resistant coating, and the inner wall of the first sleeve (11) is coated with an anti-corrosion layer.

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