Prestressed concrete metal corrugated pipe

Abstract

The utility model relates to the technical field of pipe structures, in particular to a prestressed concrete metal corrugated pipe which comprises a pipe body and a steel belt connector, the pipe body is provided with a pipe wall and spiral corrugations, the steel belt connector is provided with meshing protrusions and steel belts, and the two steel belt edges at the steel belt connector are folded into U-shaped groove structures which are connected in a hanging mode. The two U-shaped groove structures at the joint of the steel belt are pressed to form an occlusion bulge; the steel belt connectors of the prestressed concrete metal corrugated pipe are formed by pressing a plurality of layers of mutually-hung structures, connection at the steel belt connectors is firmer, the sealing performance is better, and the risk that water seepage and slurry leakage are caused at the connectors due to instability of weld joints is avoided; the connecting position of the prestressed concrete metal corrugated pipe is of a multi-layer structure, it is guaranteed that the prestressed corrugated pipe does not deform, the toothed pressing wheels are adopted, the friction force of press fit is improved, the press fit compactness is guaranteed, and the service life of the pipe body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe structures, and particularly relates to a prestressed concrete metal corrugated pipe. Background Technique

[0002] The prestressed metal corrugated pipe is a key material used in prestressed concrete structures, mainly used to protect the prestressed tendons from being eroded by concrete and to provide a passage during the tensioning process of the prestressed tendons.

[0003] 1. Materials and Structure: The prestressed metal corrugated pipe is usually made by mechanically rolling galvanized steel strips or stainless steel strips. This corrugated pipe has a corrugated outer shape, which increases the rigidity and compressive capacity of the pipe wall.

[0004] 2. Performance Characteristics: Corrosion Resistance: The surface of the metal corrugated pipe is usually treated with a coating (such as galvanizing) to enhance its corrosion resistance. Durability: The metal material has good durability and can have the same service life as the concrete structure. Rigidity: The metal corrugated pipe has high rigidity and can withstand greater pressure during the concrete pouring process. Connectivity: The metal corrugated pipe can be connected through special connectors to ensure the sealing performance and strength of the connection.

[0005] 3. Application Areas: It is used to protect prestressed tendons in structures such as prestressed concrete bridges, tunnels, and high-rise buildings. In prestressed concrete structures, the prestressed tendons are laid through the corrugated pipe and tensioned after the concrete hardens to provide a prestressing effect.

[0006] 4. Installation and Use: When installing the corrugated pipe, it needs to be laid according to the requirements of the design drawings, and is usually fixed on the formwork using brackets or tying. Before pouring the concrete, it is necessary to ensure that the inside of the corrugated pipe is unobstructed so that the prestressed tendons can be smoothly inserted. After pouring the concrete, when the concrete has hardened to a certain extent, the prestressed tendons can be inserted and tensioned.

[0007] 5. Specifications and Dimensions: The diameter and length of the prestressed metal corrugated pipe are customized according to the actual engineering requirements. The common diameter range varies from dozens of millimeters to hundreds of millimeters. The wall thickness and corrugation spacing of the corrugated pipe are also selected according to different usage conditions.

[0008] Prestressed metal bellows play an important role in modern architecture and civil engineering. Their excellent performance and wide application make them an indispensable part of prestressed concrete structures. Existing prestressed bellows made of metal are all welded at the steel belt joints during the machine rolling process. However, the welding cannot form an effective continuous weld, resulting in ineffective sealing at the pipe joints and the risk of water seepage and grout leakage at the joints, which reduces the bearing capacity and safety performance of the pipes. Welding forms welding slag inside and outside the pipe wall, affecting the use and aesthetics of the pipe. Welding will damage the coating on the surface of the steel belt, making it easy to rust starting from the weld, affecting the service life of the pipe body. Therefore, there is an urgent need to design a prestressed concrete metal bellows with a steel belt joint connection through a pressing technology to solve the problems of poor interface sealing and easy rusting of existing metal bellows. Summary of the Invention

[0009] Aiming at the problems existing in the prior art, the purpose of the present utility model is to provide a prestressed concrete metal bellows.

[0010] The technical solution adopted by the present utility model to solve its technical problems is: a prestressed concrete metal bellows, including a pipe body and a steel belt joint. The pipe body is provided with a pipe wall and spiral corrugations. The steel belt joint is provided with a biting protrusion and a steel belt. The two side edges of the steel belt at the steel belt joint are folded into a "U"-shaped groove structure that is mutually hooked, and the two "U"-shaped groove structures at the steel belt joint are pressed together to form a biting protrusion.

[0011] Specifically, the biting protrusion is located on the outer side of the pipe wall, and the biting protrusion is a planar structure on the inner side of the pipe wall.

[0012] Specifically, the outer side of the biting protrusion is provided with a pressing wheel groove, and the pressing wheel groove is formed by pressing with a toothed pressing wheel.

[0013] Specifically, the outer side of the pipe wall forms a protruding spiral corrugation, and the spiral corrugation forms a spiral groove on the inner side of the pipe wall.

[0014] Specifically, four spiral corrugations are formed on the width of the steel belt, and there are four spiral corrugations between the biting protrusions formed by the two side edges of the steel belt.

[0015] Specifically, the steel belt is made of galvanized steel belt or stainless steel belt.

[0016] The present utility model has the following beneficial effects:

[0017] The steel belt joint of the prestressed concrete metal bellows designed by the present utility model is pressed by a multi-layer mutually hooked structure. The connection at the steel belt joint is more firm and has better sealing performance, avoiding the instability of the weld seam and the risk of water seepage and grout leakage at the joint.

[0018] The connection part of the prestressed concrete metal corrugated pipe designed by the utility model is a multi-layer structure, which ensures that the prestressed corrugated pipe does not deform. And a toothed pressing wheel is adopted to increase the friction force of the pressing operation, ensure the pressing compactness, and improve the service life of the pipe body. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural view of a prestressed concrete metal corrugated pipe.

[0020] Figure 2 It is a partial cross-sectional view of a prestressed concrete metal corrugated pipe.

[0021] Figure 3 It is a cross-sectional view of the two sides of the steel strip at the steel strip interface being folded into a mutually hooked and un-pressed state.

[0022] In the figure: 1 - pipe body, 1.1 - pipe wall, 1.2 - spiral corrugation, 1.3 - spiral groove;

[0023] 2 - steel strip interface, 2.1 - engaging protrusion, 2.2 - steel strip, 2.3 - pressing wheel groove. Specific Embodiment

[0024] The following will further clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] As Figures 1 - 3 shown, a prestressed concrete metal corrugated pipe includes a pipe body 1 and a steel strip interface 2. The pipe body 1 is provided with a pipe wall 1.1, a spiral corrugation 1.2 and a spiral groove 1.3. The outer side of the pipe wall 1.1 forms a protruding spiral corrugation 1.2, and the spiral corrugation 1.2 forms a spiral groove 1.3 on the inner side of the pipe wall 1.1. The spiral corrugation 1.2 and the spiral groove 1.3 improve the rigidity and pressure-bearing capacity of the pipe body.

[0026] The steel strip interface 2 is provided with an engaging protrusion 2.1, a steel strip 2.2 and a pressing wheel groove 2.3. The two sides of the steel strip 2.2 at the steel strip interface 2 are folded into a mutually hooked "U"-shaped groove structure, as Figure 3As shown, the "U"-shaped groove structures and hook-like shapes on both sides of the steel strips 2.2 are buckled together, and it is ensured that the two steel strips 2.2 on the inner side of the pipe wall 1.1 are flush, so that the steel strip interface 2 on the inner side of the pipe wall 1.1 is in an uneven state, and the steel strip interface 2 on the outer side of the pipe wall 1.1 forms a protrusion. The inner side of the pipe wall 1.1 is sleeved on the roller shaft of the pressing and coiling machine, and the steel strip interface 2 on the outer side of the pipe wall 1.1 is pressed by a toothed pressing wheel, and the two "U"-shaped groove structures at the outer steel strip interface 2 are pressed into an engaging protrusion 2.1. The steel strip interface 2 is a multi-layer structure to ensure that the prestressed corrugated pipe does not deform, and a toothed pressing wheel is used to increase the friction force of the pressing operation, ensure the pressing density, and improve the service life of the pipe body 1.

[0027] The engaging protrusion 2.1 is located on the outer side of the pipe wall 1.1, and the engaging protrusion 2.1 is a planar structure on the inner side of the pipe wall 1.1. A pressing wheel groove 2.3 is provided on the outer side of the engaging protrusion 2.1, and the pressing wheel groove 2.3 is formed by pressing with a toothed pressing wheel.

[0028] Four spiral corrugations 1.2 are formed in the width of the steel strip 2.2. There are four spiral corrugations 1.2 between the engaging protrusions 2.1 formed by the two edges of the steel strip 2.2. The engaging protrusions 2.1 form a continuous protrusion structure, which is adapted to the spiral state of the spiral corrugations 1.2.

[0029] The steel strip 2.2 is made of galvanized steel strip or stainless steel strip.

[0030] The connection at the steel strip interface 2 is more firm and has better sealing performance, avoiding the instability of the weld seam and the risk of water seepage and slurry leakage at the interface.

[0031] The present utility model is not limited to the above embodiments. Any person should know that structural changes made under the inspiration of the present utility model, as long as they have the same or similar technical solutions as the present utility model, all fall within the protection scope of the present utility model.

[0032] The technologies, shapes, and structures not described in detail in the present utility model are all well-known technologies.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0034] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A prestressed concrete metal corrugated pipe, characterized in that: It includes a tube body and a steel belt interface, wherein the tube body is provided with a tube wall and spiral corrugations, the steel belt interface is provided with a bite protrusion and a steel belt, the two steel belt edges at the steel belt interface are folded into a "U"-shaped groove structure that is hung on each other, and the two "U"-shaped groove structures at the steel belt interface are pressed into a bite protrusion.

2. The prestressed concrete metal corrugated pipe according to claim 1, characterized in that: The engaging protrusion is located on the outside of the tube wall, and the engaging protrusion is a plane structure on the inside of the tube wall.

3. The prestressed concrete metal corrugated pipe according to claim 2, characterized in that: A pressing wheel groove is arranged on the outer side of the engaging protrusion, and the pressing wheel groove is formed by pressing a toothed pressing wheel.

4. The prestressed concrete metal corrugated pipe according to claim 1, characterized in that: The outer side of the tube wall forms a raised spiral corrugation, and the spiral corrugation forms a spiral groove on the inner side of the tube wall.

5. The prestressed concrete metal corrugated pipe according to claim 4, characterized in that: Four spiral corrugations are formed on the width of the steel strip, and four spiral corrugations are formed between the bite protrusions formed on the two edges of the steel strip.

6. The prestressed concrete metal corrugated pipe according to claim 1, characterized in that: The steel belt is a galvanized steel belt or a stainless steel belt.

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