3PE anti-corrosion steel pipe

Abstract

The utility model relates to the technical field of spiral steel pipes, in particular to a 3PE anti-corrosion steel pipe which comprises a pipe body and outer shells, the two ends of the pipe body are provided with a front opening and a rear opening which are used for connection, the outer shells used for protection are symmetrically arranged on the pipe body, the pipe body is provided with upper protruding bodies used for limiting movement of the outer shells, and the outer shells are provided with lower protruding bodies used for limiting movement of the outer shells. A plurality of round nails for fixing the shell are arranged on the pipe body, a lower convex body is arranged on the pipe body, the front opening is matched with the rear opening, and a clamping block for splicing is arranged on the shell. The two sides of the pipe body are protected through the two shells, the two fragile sides of the pipe body are protected, then the shells are reinforced through the round nails and the square nails, the situation that the pipe body is damaged due to the fact that the shells are loosened due to the fact that the pipe body is buried for a long time is avoided, the lower end of the pipe body is trapezoidal, and the contact area between the pipe body and soil can be increased; therefore, the phenomenon that the pipe body deviates is reduced, and meanwhile the phenomenon that the shell deforms along with deviation of the pipe body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of spiral steel pipes, in particular to a 3PE anti-corrosion steel pipe. Background Art

[0002] The base materials of 3PE anti-corrosion steel pipes include seamless steel pipes, spiral steel pipes and straight seam steel pipes. The three-layer structure of polyethylene (3PE) anti-corrosion coating has been widely used in the petroleum pipeline industry due to its good corrosion resistance, water vapor permeability and mechanical properties, etc.

[0003] Referring to the patent document with the application number "CN202120071352.1" and the name of a new type of 3PE external anti-corrosion steel pipe, in this patent document, by setting wedge-shaped blocks, when the fixing blocks of the protective sleeve are placed in the fixing grooves, the wedge-shaped blocks will be extruded by the inner walls of the fixing grooves. With the setting that the size of the wedge-shaped blocks is smaller than that of the grooves, the wedge-shaped blocks will enter the grooves, and finally the wedge-shaped blocks can be fixed in the installation grooves, so that the protective sleeve is fixed outside the steel pipe body to protect it.

[0004] The protective sleeves in the prior art are fixedly connected to the grooves on the steel pipe body through buckles, and the whole steel pipe can be sleeved inside. Although the protective sleeve can protect the steel pipe body, when the 3PE steel pipe is buried deep underground, the corrugations on the surface of the protective sleeve will be continuously flattened over a long time, which will directly affect the steel pipe body over time, thereby reducing the service life of the steel pipe.

[0005] Therefore, we have designed a 3PE anti-corrosion steel pipe. Content of the Utility Model

[0006] The purpose of the utility model is to propose a 3PE anti-corrosion steel pipe to solve the problem that the protective sleeve is prone to deformation when buried underground for a long time.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A PE anti-corrosion steel pipe includes a pipe body and an outer shell. The two ends of the pipe body are provided with a front port and a rear port for connection. The pipe body is symmetrically provided with an outer shell for protection. The pipe body is provided with an upper convex body for restricting the movement of the outer shell. The pipe body is provided with a plurality of round nails for fixing the outer shell. The pipe body is provided with a lower convex body. The front port is adapted to the rear port. The outer shell is provided with a clamping block for splicing.

[0009] Preferably, the upper convex body is trapezoidal and fixedly connected to the pipe body, and a long hole is opened on the upper convex body.

[0010] Preferably, the round nails are linearly arranged on the upper convex body and penetrate through the inner wall of the upper convex body. A fixing strip for strengthening the round nails is provided on the upper convex body and is fixedly connected to the upper convex body. The round nails are adapted to the outer shell.

[0011] Preferably, the lower convex body is fixedly connected to the pipe body. A long hole is formed in the lower convex body. A plurality of square nails arranged linearly are provided on the lower convex body and penetrate through the inner wall of the lower convex body. The square nails are adapted to the outer shell. The lower convex body is adapted to the upper convex body.

[0012] Preferably, a front thread for connection is provided on the front opening, and a rear thread is provided on the rear opening and is adapted to the front thread.

[0013] Preferably, the clamping blocks are fixedly arranged at both ends of the outer shell. The clamping blocks are adapted to the upper convex body and the lower convex body. Buffer layers for reducing pressure are provided inside the outer shell.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model protects both sides of the pipe body through two outer shells, forming protection for the vulnerable sides of the pipe body. Then, the outer shell is strengthened by round nails and square nails, avoiding damage to the pipe body caused by the loosening of the outer shell due to the long burial time of the pipe body. Moreover, the lower end of the pipe body is trapezoidally arranged, which can increase the contact area between the pipe body and the soil, thereby reducing the phenomenon of pipe body deviation and simultaneously reducing the deformation of the outer shell caused by the deviation of the pipe body.

[0016] 2. The present utility model strengthens the round nails and square nails through the fixing strip, significantly improving the stability of the outer shell. At the same time, the arrangement of the square nails can also increase the stress area of the pipe body. In order to reduce the influence of excessive underground pressure on the protection ability of the outer shell, the buffer layer inside the outer shell can effectively reduce the loss of underground pressure, thereby improving the service life of the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a 3PE anti-corrosion steel pipe proposed by the present utility model;

[0018] Figure 2 is an enlarged view of the upper convex body of a 3PE anti-corrosion steel pipe proposed by the present utility model;

[0019] Figure 3 is an enlarged view of the lower convex body of a 3PE anti-corrosion steel pipe proposed by the present utility model;

[0020] Figure 4 is an elevation view of the outer shell of a 3PE anti-corrosion steel pipe proposed by the present utility model;

[0021] Figure 5 is a sectional view of the outer shell of a 3PE anti-corrosion steel pipe proposed by the present utility model.

[0022] In the figure: 1, pipe body; 2, outer shell; 3, upper convex body; 4, lower convex body; 5, long hole; 6, front port; 7, front thread; 8, rear port; 9, rear thread; 10, fixing strip; 11, round nail; 12, square nail; 13, clamping block; 14, buffer interlayer. Specific implementation mode

[0023] Refer to Figures 1 - 5 , a 3PE anti-corrosion steel pipe, including a pipe body 1 and an outer shell 2. The pipe body 1 is a 3PE anti-corrosion steel pipe in the prior art, and the pipe body 1 itself is buried underground all year round for oil transportation, etc. The outer shell 2 is a component for protecting the 3PE anti-corrosion steel pipe. It is made of anti-corrosion steel as a whole, which can avoid using plastic products buried underground. Being buried for a long time is likely to cause surface depressions and directly damage the 3PE anti-corrosion steel pipe. A front port 6 and a rear port 8 for connection are respectively arranged at the front and rear ends of the pipe body 1. The two are mainly used to make the connection between the pipe bodies 1 tight, and the outer shell 2 is mainly used for protection.

[0024] The pipe body 1 is provided with an upper convex body 3 for restricting the movement of the outer shell 2. The upper convex body 3 is mainly used to extend the stress area of the pipe body 1 and make the upper and lower ends of the pipe body 1 more stable in the soil, reducing the phenomenon of the pipe body 1 skewing and offsetting. The upper convex body 3 is trapezoidal, presenting a regular trapezoid as a whole, and is fixedly connected to the pipe body 1. The two are originally integrated. A long hole 5 is opened on the upper convex body 3. The function of the long hole 5 is mainly for the later connection of the outer shell 2.

[0025] The pipe body 1 is provided with a plurality of round nails 11 for fixing the outer shell 2. The round nails 11 are mainly used for fixing the outer shell 2 and have all been specially anti-corrosion treated. The round nails 11 are linearly arranged on the upper convex body 3 and penetrate the inner wall of the upper convex body 3. When the outer shell 2 is installed in the long hole 5, a plurality of round nails 11 can be arranged in a straight line on the upper convex body 3 and penetrate the connecting parts of the upper convex body 3 and the outer shell 2, so that the outer shell 2 is firmly fixed in the long hole 5. The upper convex body 3 is provided with a fixing strip 10 for strengthening the round nails 11. The surface of the fixing strip 10 is provided with the same number of holes as the round nails 11. The fixing strip 10 is heated at the bottom and then adhered to the surface of the upper convex body 3 to make the holes correspond to each round nail 11, forming a strengthening effect on the round nails 11, avoiding the aging of the connection part after being buried underground for a long time, and being fixedly connected to the upper convex body 3. The round nails 11 are adapted to the outer shell 2, and both ends of the outer shell 2 also match the round nails 11, and its surface is also provided with round holes corresponding to the round nails 11.

[0026] The tube body 1 is provided with a lower convex body 4. The lower convex body 4 is located at the bottom of the tube body 1 and has the same structure as the upper convex body 3, and its function is also the same. The lower convex body 4 is fixedly connected to the tube body 1 and is integrally arranged. A long hole 5 is provided on the lower convex body 4. Here, the long hole 5 is the same as the upper convex body 3. The lower convex body 4 is provided with a plurality of square nails 12 arranged linearly. The purpose of using the square nails 12 on the lower convex body 4 is to increase the contact area at the bottom of the tube body 1, so that the square nails 12 are always in a state of abutting against the ground and penetrate the inner wall of the lower convex body 4. The fixing method of the square nails 12 is the same as that of the round nails 11. The square nails 12 are adapted to the outer shell 2. The lower convex body 4 is adapted to the upper convex body 3. The lower convex body 4 and the upper convex body 3 have the same structure.

[0027] The front port 6 is adapted to the rear port 8. Through the splicing of the tube body 1, the latter tube body 1 can dock the front port 6 to the rear port 8 of the former, and the latter tube body 1 is manually rotated to be connected to the former tube body 1. And rubber strips are provided at the edges of the front port 6 and the rear port 8 to reduce moisture erosion. A front thread 7 for connection is provided on the front port 6, and a rear thread 9 is provided on the rear port 8 and is adapted to the front thread 7. Both the front thread 7 and the rear thread 9 are connected by rotation.

[0028] The outer shell 2 is provided with clamping blocks 13 for splicing. After the two outer shells 2 are docked, the clamping blocks 13 are fixed in the upper convex body 3 and the lower convex body 4. The clamping blocks 13 are fixedly arranged at both ends of the outer shell 2. The clamping blocks 13 at both ends are fixed by rivets. The clamping blocks 13 are adapted to the upper convex body 3 and the lower convex body 4. After the two outer shells 2 are combined, when the clamping blocks 13 are progressive, they present an inverted trapezoid, which exactly coincides with the regular trapezoid of the upper convex body 3 and the lower convex body 4. Then, the two outer shells 2 on both sides are fixed by the round nails 11 and the square nails 12. A buffer sandwich 14 for reducing pressure is provided inside each outer shell 2. The buffer sandwich 14 is the hollow part inside each outer shell 2, and buffer materials such as buffer cotton are provided in the hollow part.

[0029] The working principle of the present utility model is as follows: After passing the clamping blocks 13 at both ends of the two outer shells 2 through the long holes 5 and abutting against each other, a plurality of round nails 11 and square nails 12 can be fixed on the upper convex body 3 and the lower convex body 4. In order to ensure the stability of the round nails 11 and the square nails 12, the fixing strip 10 after being heated at the bottom is embedded between the round nails 11 and the square nails 12, and the cooled fixing strip 10 will be fixedly connected to the upper convex body 3 and the lower convex body 4, so as to achieve the strengthening effect.

[0030] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A 3PE anti-corrosion steel pipe, comprising a pipe body (1) and an outer shell (2), wherein the pipe body (1) is provided with a front port (6) and a rear port (8) for connection at both ends, and the pipe body (1) is symmetrically provided with an outer shell (2) for protection, characterized in that: The tube body (1) is provided with an upper protrusion (3) for limiting the movement of the outer shell (2), the tube body (1) is provided with a plurality of round nails (11) for fixing the outer shell (2), the tube body (1) is provided with a lower protrusion (4), the front opening (6) is matched with the rear opening (8), and the outer shell (2) is provided with a clamping block (13) for splicing.

2. A 3PE anti-corrosion steel pipe according to claim 1, characterized in that: The upper convex body (3) is trapezoidal in shape and is fixedly connected to the tube body (1); a long hole (5) is provided on the upper convex body (3).

3. A 3PE anti-corrosion steel pipe according to claim 1, characterized in that: The round nail (11) is linearly arranged on the upper convex body (3) and penetrates the inner wall of the upper convex body (3). The upper convex body (3) is provided with a fixing strip (10) for reinforcing the round nail (11) and is fixedly connected to the upper convex body (3). The round nail (11) is adapted to the outer shell (2).

4. A 3PE anti-corrosion steel pipe according to claim 3, characterized in that: The lower convex body (4) is fixedly connected to the tube body (1); a long hole (5) is provided on the lower convex body (4); a plurality of linearly arranged square nails (12) are provided on the lower convex body (4) and penetrate the inner wall of the lower convex body (4); the square nails (12) are matched with the outer shell (2); and the lower convex body (4) is matched with the upper convex body (3).

5. The 3PE anti-corrosion steel pipe according to claim 1, characterized in that: The front opening (6) is provided with a front thread (7) for connection, and the rear opening (8) is provided with a rear thread (9) which is matched with the front thread (7).

6. A 3PE anti-corrosion steel pipe according to claim 4, characterized in that: The clamping blocks (13) are fixedly arranged at both ends of the outer shell (2); the clamping blocks (13) are matched with the upper convex body (3) and the lower convex body (4); and a buffer interlayer (14) for reducing pressure is provided inside the outer shell (2).

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