Conductive steel strip and pccp pipe
By designing a bonding structure between the arc-shaped conductive steel strip and the prestressed steel wire, the problems of easy deformation and gaps in the conductive steel strip in PCCP pipes were solved, achieving better electrical continuity and structural reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG ELECTRIC POWER PLANNING SURVEY & DESIGN INST
- Filing Date
- 2023-07-20
- Publication Date
- 2026-07-28
AI Technical Summary
The existing conductive steel strip is prone to deformation and gaps in PCCP pipes, which leads to cracks or breaks in the prestressed steel wires and poor electrical continuity.
The main body of the conductive steel strip is designed with an arc-shaped structure. The first surface is an arc surface, the second surface is an arc surface or other smooth shape, and the first and second ends are pointed. It is combined with protrusions to fit the concrete core and prestressed steel wire, and is manufactured using a roll forming process.
It improves the fit between the conductive steel strip and the prestressed steel wire, avoids gaps and stress concentration, enhances electrical continuity, reduces the risk of breakage, and improves structural reliability and electrical connection performance.
Smart Images
Figure CN116928459B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of prestressed steel cylinder concrete pipe structure technology, and in particular to a conductive steel strip and PCCP pipe. Background Technology
[0002] Prestressed concrete cylinder pipe (PCCP) is a new type of composite pipe made from four basic raw materials: steel plate, prestressed steel wire, concrete, and cement mortar. It undergoes processes such as steel cylinder forming, concrete pouring, application of prestress control technology, and protective layer spraying. PCCP pipes are suitable for large-scale water transmission projects between regional water sources, water supply and distribution networks for tap water, industrial and agricultural irrigation systems, power plant circulating water pipelines, various municipal pressure sewage main pipelines, and inverted siphon pipes, and are widely used globally.
[0003] When PCCP pipes are used, since they are often buried underground, cathodic protection corrosion control is required for the pipes, especially the prestressed steel wires inside, to extend their service life and ensure the reliability of water resource transportation. Current PCCP pipe manufacturing must comply with the national standard GB / T 28725-2012 "Catholic Protection of Buried Prestressed Steel Cylinder Concrete Pipes". To achieve electrical continuity of the steel structure, especially the prestressed steel wires, between PCCP pipes, a thin steel strip is installed longitudinally along the concrete core during pipe manufacturing. Circumferential prestressed steel wires are wound around the outside of this thin steel strip, which extends to both ends of the PCCP pipe for cross-connecting cables between pipes.
[0004] Specifically, such as Figures 1 to 3 As shown, existing PCCP pipes generally include a concrete core 61, a prestressed steel wire 62 wound around the concrete core 61, a conductive steel strip 63 disposed between the concrete core 61 and the prestressed steel wire 62, and a cement mortar layer (not shown) disposed outside the prestressed steel wire 62; the concrete core 61 further includes an inner concrete layer, a steel cylinder, and an outer concrete layer 611 (the inner concrete layer and steel cylinder are not shown in the figure) arranged sequentially from the inside to the outside, that is, the prestressed steel wire 62 is wound around the outer concrete layer 611, and the conductive steel strip 63 is located between the outer concrete layer 611 and the prestressed steel wire 62, thereby being electrically connected to the prestressed steel wire 62.
[0005] However, as Figure 2 and Figure 3 As shown, since the cross-section of the current conductive steel strip 63 is generally rectangular (according to standard requirements, its cross-section should be 20mm × 2mm, that is, 20mm wide and 2mm thick), it has the following problems in actual use:
[0006] 1. Since the conductive steel strip 63 is a straight structure, it will be deformed in the transverse cross-section after direct use (because the outer concrete layer 611 is a cylindrical structure, its shape needs to be adapted to the shape of the outer concrete layer 611 to fit the surface of the outer concrete layer 611, thus causing it to deform). This deformation stress can easily lead to cracks or even breakage of the conductive steel strip 63.
[0007] 2. Because the outer concrete layer 611 has a circular cross-section, and the prestressed steel wire 62 also has a circular cross-section after winding, while the conductive steel strip 63 has a rectangular cross-section and a certain thickness on both sides, the prestressed steel wire 62 cannot be completely adhered to the outer concrete layer 611 at both sides of the conductive steel strip 63, resulting in a gap 60 between the prestressed steel wire 62 and the outer concrete layer 611. This gap 60 can easily lead to insufficient spraying of concrete mortar over the prestressed steel wire 62 later, posing a potential hazard to the actual use of the prestressed steel wire 62. At the same time, stress concentration will occur at the corners 631 on both sides of the conductive steel strip 63, making the prestressed steel wire 62 susceptible to cracks or even breakage during long-term use. Summary of the Invention
[0008] The purpose of this invention is to provide a conductive steel strip that can fit well with the concrete core and the prestressed steel wire, avoid gaps between the prestressed steel wire and the concrete core, and avoid stress concentration problems in the prestressed steel wire.
[0009] This invention provides a conductive steel strip for placement between the concrete core and prestressed steel wire of a PCCP pipe. The conductive steel strip includes a main body having opposing first and second surfaces. The first surface is for contacting the outer surface of the concrete core, and the second surface is for contacting the prestressed steel wire. The second surface has an arc-shaped structure, and the first surface is at least partially an arc-shaped structure. The arc centers of the second surface and the first surface are both located on the side of the first surface away from the second surface. Along the width direction of the conductive steel strip, the main body has opposing first and second ends. The opposing sides of the first surface and the opposing sides of the second surface intersect at the positions of the first and second ends, respectively, so that the first and second ends of the main body are both pointed structures.
[0010] In one feasible approach, the second surface is an arc-shaped structure.
[0011] In one possible implementation, the first surface is a monolithic arcuate surface structure.
[0012] In one possible implementation, the conductive steel strip further includes a protrusion disposed on a first surface of the main body portion, the protrusion extending from the first surface toward a side away from the second surface.
[0013] In one possible implementation, along the width direction of the conductive steel strip, the protrusion is located at the center of a first surface of the main body; the first surface includes a first portion and a second portion, the first portion being located between the protrusion and the first end, and the second portion being located between the protrusion and the second end, both the first portion and the second portion being arc-shaped structures.
[0014] In one feasible manner, the maximum thickness of the conductive steel strip is less than or equal to 2 mm.
[0015] In one feasible manner, the method for manufacturing the conductive steel strip includes the following steps:
[0016] A rolling device and steel are provided; the rolling device includes a first roller and a second roller arranged vertically opposite each other, the first roller includes a first rolling part, the second roller includes a second rolling part, the first rolling part and the second rolling part are arranged vertically opposite each other; the surface of the first rolling part is a concave arc-shaped structure, and the surface of the second rolling part is at least partially a convex arc-shaped structure;
[0017] The steel is rolled using the first and second rolling sections of the rolling device to form the conductive steel strip.
[0018] The present invention also provides a PCCP pipe, comprising a concrete core and a prestressed steel wire disposed on the outer wall of the concrete core. The PCCP pipe further comprises the aforementioned conductive steel strip disposed between the concrete core and the prestressed steel wire. The first surface of the main body is in contact with the outer surface of the concrete core, and the second surface of the main body is in contact with the prestressed steel wire.
[0019] In one possible implementation, the first surface of the main body is an integral arc-shaped structure, and the center of the arc of the first surface of the main body is located on the axis of the concrete core.
[0020] In one possible implementation, the conductive steel strip further includes a protrusion disposed on a first surface of the main body, the protrusion extending from the first surface toward a side away from the second surface; a groove is provided on the outer surface of the concrete core, and the protrusion is located in the groove.
[0021] In one feasible embodiment, the concrete core includes an inner concrete layer, a steel cylinder, and an outer concrete layer arranged sequentially from the inside out; the prestressed steel wire is disposed on the outer wall of the outer concrete layer; the conductive steel strip is located between the outer concrete layer and the prestressed steel wire; and the first surface of the main body is in contact with the outer surface of the outer concrete layer.
[0022] The conductive steel strip provided by the present invention, by setting the second surface of the main body to an arc-shaped structure, setting at least part of the first surface of the main body to an arc-shaped structure, and setting both the first end and the second end of the main body to a pointed structure, so that the cross-section of the main body is crescent-shaped, the main body of which can fit well with the concrete core and the prestressed steel wire, thereby avoiding gaps between the prestressed steel wire and the concrete core, avoiding stress concentration and other problems of the prestressed steel wire, avoiding the risk of cracks or breaks in the conductive steel strip and the prestressed steel wire, improving structural reliability, and having better electrical continuity performance. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a PCCP pipe in the prior art.
[0024] Figure 2 for Figure 1 A schematic diagram of its cross-section.
[0025] Figure 3 for Figure 2 A magnified schematic diagram of the structure at position A in the middle.
[0026] Figure 4 This is a schematic cross-sectional view of the PCCP pipe in an embodiment of the present invention.
[0027] Figure 5 for Figure 4 A magnified schematic diagram of the structure at position B in the middle.
[0028] Figure 6 for Figure 5 A schematic diagram of the cross-section of the central conductive steel strip.
[0029] Figure 7 This is an enlarged schematic diagram of the cross-sectional structure of the PCCP pipe in another embodiment of the present invention.
[0030] Figure 8 for Figure 7 A schematic diagram of the cross-section of the central conductive steel strip.
[0031] Figure 9 This is a cross-sectional schematic diagram of the roller pressing device in an embodiment of the present invention.
[0032] Figure 10 This is a cross-sectional schematic diagram of the roller pressing device in another embodiment of the present invention. Detailed Implementation
[0033] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0034] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0035] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed by this invention.
[0036] like Figures 4 to 6 As shown, the conductive steel strip 1 provided in this embodiment of the invention is used to be disposed between the concrete core 2 and the prestressed steel wire 3 of a PCCP pipe. The conductive steel strip 1 includes a main body 11, which has a first surface 111 and a second surface 112 facing each other. The first surface 111 is used to contact the outer surface of the concrete core 2, and the second surface 112 is used to contact the prestressed steel wire 3. The second surface 112 has an arc-shaped structure (i.e., the cross-section of the second surface 112 is an arc-shaped structure), and the first surface 111 is at least partially an arc-shaped structure (i.e., the cross-section of the second surface 112 is at least partially an arc-shaped structure; specifically, the first surface 111 is at least near the first end 11A and the second end 11B with an arc-shaped structure). The arc center of the second surface 112 and the arc center of the arc-shaped structure portion of the first surface 111 are both located on the side of the first surface 111 away from the second surface 112 (i.e., from...). Figure 6 In the middle view, both the second surface 112 and the first surface 111 are curved downwards, causing the main body 11 to bend downwards as a whole.
[0037] Along the width direction W of the conductive steel strip 1, the main body 11 has a first end 11A and a second end 11B. The opposite sides of the first surface 111 and the opposite sides of the second surface 112 intersect at the positions of the first end 11A and the second end 11B, respectively, so that the first end 11A and the second end 11B of the main body 11 are both pointed structures (i.e., the thickness of the main body 11 at the positions of the first end 11A and the second end 11B is 0 or close to 0), thereby making the cross-section of the main body 11 a crescent-shaped structure with the thickness gradually decreasing from the middle position toward the two sides.
[0038] Specifically, the conductive steel strip 1 provided in this embodiment has an arc-shaped structure on the second surface 112 of the main body 11 and at least partially an arc-shaped structure on the first surface 111 of the main body 11. The first end 11A and the second end 11B of the main body 11 are both pointed structures, which makes the cross-section of the main body 11 crescent-shaped. The crescent-shaped main body 11 can fit well with the concrete core 2 and the prestressed steel wire 3, thereby avoiding gaps between the prestressed steel wire 3 and the concrete core 2, and avoiding stress concentration problems in the prestressed steel wire 3. It also avoids the risk of cracks or breaks in the conductive steel strip 1 and the prestressed steel wire 3, improving the structural reliability while having better electrical continuity performance (because the conductive steel strip 1 can fit better with the prestressed steel wire 3, the contact area is larger, so the electrical connection performance between the two is better).
[0039] like Figure 6 As shown, in one embodiment, the second surface 112 of the main body 11 has an arc-shaped structure, so that the conductive steel strip 1 can better fit with the prestressed steel wire 3.
[0040] It should be noted that, since the concrete core 2 is a cylindrical structure, the part of the first surface 111 of the main body 11 that contacts the outer wall of the concrete core 2 is an arc-shaped structure; while the second surface 112 of the main body 11 contacts the prestressed steel wire 3. The prestressed steel wire 3 has a certain degree of flexibility, and its shape can adapt to the shape of the second surface 112 of the main body 11, so as to fit the second surface 112. Therefore, the second surface 112 of the main body 11 can be an arc-shaped structure or other smooth arc-shaped structures.
[0041] In one implementation, the curvature of the first surface 111 and the curvature of the second surface 112 can be determined according to the outer diameter of the concrete core 2.
[0042] like Figure 6 As shown, in one embodiment, the first surface 111 of the main body 11 is an integral arc-shaped structure (that is, the cross-section of the first surface 111 of the main body 11 is an integral arc-shaped structure), that is, the cross-section of the conductive steel strip 1 is an integral crescent-shaped structure.
[0043] like Figure 7 and Figure 8 As shown, in another embodiment, the conductive steel strip 1 further includes a protrusion 12, which is disposed on the first surface 111 of the main body 11. The protrusion 12 protrudes from the first surface 111 toward the side away from the second surface 112. The width of the protrusion 12 is smaller than the width of the main body 11. The opposite sides of the protrusion 12 are spaced a certain distance from the first end 11A and the second end 11B, respectively.
[0044] Specifically, a groove 20 is pre-formed on the outer surface of the concrete core 2. When the conductive steel strip 1 is installed, the protrusion 12 of the conductive steel strip 1 is located in the groove 20, thereby fixing the conductive steel strip 1 to the concrete core 2 and achieving the effect of pre-fixing the conductive steel strip 1. This facilitates the subsequent installation of the prestressed steel wire 3 (i.e., when the prestressed steel wire 3 is wound on the concrete core 2, it will not slip because the conductive steel strip 1 is pre-fixed, thus facilitating the installation of the prestressed steel wire 3). At the same time, the conductive steel strip 1 of this structure can also fit tightly with the prestressed steel wire 3 and the concrete core 2, avoiding gaps between the prestressed steel wire 3 and the concrete core 2, and avoiding stress concentration problems in the prestressed steel wire 3.
[0045] like Figure 7 and Figure 8 As shown, in one embodiment, along the width direction W of the conductive steel strip 1, the protrusion 12 is located at the middle position on the first surface 111 of the main body 11; the first surface 111 includes a first part 1111 and a second part 1112, the first part 1111 is located between the protrusion 12 and the first end 11A, and the second part 1112 is located between the protrusion 12 and the second end 11B, and both the first part 1111 and the second part 1112 are arc-shaped structures.
[0046] like Figure 7 and Figure 8 As shown, in one embodiment, the cross-section of the protrusion 12 can be a rectangular, inverted trapezoidal, or arc-shaped structure (in this embodiment, the cross-section of the protrusion 12 is a rectangular structure).
[0047] like Figure 6 As shown, in one embodiment, the maximum thickness T of the conductive steel strip 1 is less than or equal to 2 mm, that is, the thickness of the conductive steel strip 1 at the middle position is less than or equal to 2 mm.
[0048] As one implementation method, the conductive steel strip 1 is manufactured by roll forming. Roll forming is not only simple and easy to implement, but also has simple processing equipment and low cost.
[0049] As one implementation method, the manufacturing method of the conductive steel strip 1 includes the following steps:
[0050] Provide the roller pressing device 5 and steel (the steel can be a standard 20mm × 2mm steel strip); such as Figure 9As shown, the roller pressing device 5 includes a first roller 51 and a second roller 52 arranged vertically opposite each other. The first roller 51 is located above the second roller 52. The first roller 51 includes a first pressing part 511, and the second roller 52 includes a second pressing part 521. The first pressing part 511 and the second pressing part 521 are arranged vertically opposite each other. The surface of the first pressing part 511 is a concave arc-shaped structure, and the surface of the second pressing part 521 is at least partially a convex arc-shaped structure.
[0051] The steel is rolled using the first roll forming part 511 and the second roll forming part 521 of the roll forming device 5 to extrude the steel into the required shape, thereby obtaining the conductive steel strip 1.
[0052] like Figure 9 As shown, in one implementation method, when processing such as Figure 6 When the conductive steel strip 1 is connected, the surface of the second roller pressing part 521 of the roller pressing device 5 is an integral outwardly convex arc-shaped structure.
[0053] like Figure 10 As shown, as another implementation, when processing such as Figure 8 When the conductive steel strip 1 is shown, a groove (not labeled) is provided at the center of the surface of the second roller pressing part 521 of the roller pressing device 5, and the surfaces of the second roller pressing part 521 on both sides of the groove are convex arc-shaped structures. The depth of the groove can be determined according to the thickness of the protrusion 12.
[0054] like Figures 4 to 6 As shown, this embodiment of the invention also provides a PCCP (Prestressed Concrete Cylinder Pipe), comprising a concrete core 2, prestressed steel wires 3 disposed on the outer wall of the concrete core 2, and the aforementioned conductive steel strip 1. The prestressed steel wires 3 are wound around the outer wall of the concrete core 2, and the conductive steel strip 1 is disposed between the concrete core 2 and the prestressed steel wires 3. The first surface 111 of the main body 11 is in contact with the outer surface of the concrete core 2, and the second surface 112 of the main body 11 is in contact with the surface of the prestressed steel wires 3, so that the conductive steel strip 1 is electrically connected to the prestressed steel wires 3. At the same time, the conductive steel strip 1 extends along the axial direction of the concrete core 2, and the opposite ends of the conductive steel strip 1 extend to the opposite sides of the concrete core 2.
[0055] like Figures 4 to 6 As shown, in one embodiment, the first surface 111 of the main body 11 is an integral arc-shaped structure, and the arc center of the first surface 111 of the main body 11 is located on the axis of the concrete core 2 (i.e., the two are concentrically arranged), and the first surface 111 of the main body 11 is in contact with the outer surface of the concrete core 2.
[0056] like Figures 4 to 6 As shown, in one embodiment, the concrete core 2 includes an inner concrete layer (not shown), a steel cylinder (not shown), and an outer concrete layer 21 arranged sequentially from the inside to the outside. The prestressed steel wire 3 is disposed on the outer wall of the outer concrete layer 21, and the conductive steel strip 1 is located between the outer concrete layer 21 and the prestressed steel wire 3. The first surface 111 of the main body 11 is in contact with the outer surface of the outer concrete layer 21.
[0057] like Figure 7 and Figure 8 As shown, in one embodiment, the conductive steel strip 1 further includes a protrusion 12, which is disposed on the first surface 111 of the main body 11. The protrusion 12 protrudes from the first surface 111 toward the side away from the second surface 112. A groove 20 is provided on the outer surface of the concrete core 2 (specifically, the groove 20 is disposed on the outer surface of the outer concrete layer 21), and the protrusion 12 is located in the groove 20. The first surface 111 includes a first part 1111 and a second part 1112. The first part 1111 is located between the protrusion 12 and the first end 11A, and the second part 1112 is located between the protrusion 12 and the second end 11B. Both the first part 1111 and the second part 1112 are arc-shaped structures, and the first part 1111 and the second part 1112 are respectively attached to the outer surfaces of the concrete core 2 on both sides of the groove 20.
[0058] In one embodiment, the PCCP pipe also includes a cement mortar layer (not shown), which is disposed on the outer surface of the concrete core 2 and covered with prestressed steel wires 3.
[0059] The conductive steel strip 1 provided in this embodiment of the invention features an arc-shaped structure on the second surface 112 of the main body 11, and at least partially arc-shaped structure on the first surface 111 of the main body 11. Furthermore, both the first end 11A and the second end 11B of the main body 11 are pointed, resulting in a crescent-shaped cross-section for the main body 11. This crescent-shaped structure allows the main body 11 to fit well with the concrete core 2 and the prestressed steel wire 3, thus avoiding gaps between the prestressed steel wire 3 and the concrete core 2, and preventing stress concentration in the prestressed steel wire 3. This also avoids the risk of cracks or breaks in the conductive steel strip 1 and the prestressed steel wire 3, improving structural reliability while providing superior electrical continuity. Additionally, the conductive steel strip 1 is easy to process and has low manufacturing costs, providing superior mechanical and corrosion-resistant properties for PCCP pipes in practical applications.
[0060] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A conductive steel strip for placement between the concrete core (2) and prestressed steel wire (3) of a PCCP pipe, characterized in that, The conductive steel strip (1) includes a main body (11), which has a first surface (111) and a second surface (112) facing each other. The first surface (111) is used to contact the outer surface of the concrete core (2), and the second surface (112) is used to contact the prestressed steel wire (3). The second surface (112) has an arc-shaped structure, and the first surface (111) is at least partially an arc-shaped structure. The arc center of the second surface (112) and the arc center of the first surface (111) are... Both are located on the side of the first surface (111) away from the second surface (112); along the width direction (W) of the conductive steel strip (1), the main body (11) has a first end (11A) and a second end (11B) opposite to each other, and the opposite sides of the first surface (111) and the opposite sides of the second surface (112) intersect at the positions of the first end (11A) and the second end (11B) respectively, so that the first end (11A) and the second end (11B) of the main body (11) are both pointed structures.
2. The conductive steel strip as described in claim 1, characterized in that, The second surface (112) has a circular arc surface structure.
3. The conductive steel strip as described in claim 1, characterized in that, The first surface (111) is an integral arc-shaped structure.
4. The conductive steel strip as described in claim 1, characterized in that, The conductive steel strip (1) also includes a protrusion (12), which is disposed on the first surface (111) of the main body (11) and protrudes from the first surface (111) toward the side away from the second surface (112).
5. The conductive steel strip as described in claim 4, characterized in that, Along the width direction (W) of the conductive steel strip (1), the protrusion (12) is located at the middle position on the first surface (111) of the main body (11); the first surface (111) includes a first part (1111) and a second part (1112), the first part (1111) is located between the protrusion (12) and the first end (11A), and the second part (1112) is located between the protrusion (12) and the second end (11B). Both the first part (1111) and the second part (1112) are arc-shaped structures.
6. The conductive steel strip as described in claim 1, characterized in that, The maximum thickness (T) of the conductive steel strip (1) is less than or equal to 2 mm.
7. The conductive steel strip as described in any one of claims 1-6, characterized in that, The method for manufacturing the conductive steel strip (1) includes the following steps: A rolling device (5) and steel are provided; the rolling device (5) includes a first roller (51) and a second roller (52) arranged opposite each other, the first roller (51) includes a first rolling part (511), the second roller (52) includes a second rolling part (521), the first rolling part (511) and the second rolling part (521) are arranged opposite each other; the surface of the first rolling part (511) is a concave arc-shaped structure, and the surface of the second rolling part (521) is at least partially a convex arc-shaped structure; The steel is rolled using the first rolling section (511) and the second rolling section (521) of the rolling device (5) to form the steel into the conductive steel strip (1).
8. A PCCP pipe, comprising a concrete core (2) and prestressed steel wires (3) disposed on the outer wall of the concrete core (2), characterized in that, The PCCP pipe further includes a conductive steel strip (1) as described in any one of claims 1-7, the conductive steel strip (1) being disposed between the concrete core (2) and the prestressed steel wire (3); the first surface (111) of the main body (11) is in contact with the outer surface of the concrete core (2), and the second surface (112) of the main body (11) is in contact with the prestressed steel wire (3).
9. The PCCP pipe as described in claim 8, characterized in that, The first surface (111) of the main body (11) is an integral arc-shaped structure, and the center of the arc of the first surface (111) of the main body (11) is located on the axis of the concrete core (2).
10. The PCCP pipe as described in claim 8, characterized in that, The conductive steel strip (1) further includes a protrusion (12), which is disposed on the first surface (111) of the main body (11). The protrusion (12) extends from the first surface (111) toward the side away from the second surface (112). The outer surface of the concrete core (2) is provided with a groove (20), and the protrusion (12) is located in the groove (20).
11. The PCCP pipe as described in claim 8, characterized in that, The concrete core (2) includes an inner concrete layer, a steel cylinder and an outer concrete layer (21) arranged sequentially from the inside to the outside. The prestressed steel wire (3) is disposed on the outer wall of the outer concrete layer (21). The conductive steel strip (1) is located between the outer concrete layer (21) and the prestressed steel wire (3). The first surface (111) of the main body (11) is in contact with the outer surface of the outer concrete layer (21).