High-pressure-resistant mpp composite cable conduit

Abstract

A kind of high pressure-resistant Mpp composite cable conduit, it is related to cable conduit field, including inner tube layer, the outer side end surface of the inner tube layer is covered with outer protective layer, several convex rib parts are arranged at equal intervals on the outer protective layer, inner embedding groove is arranged in the convex rib part, support ring body is embedded and installed in the inner embedding groove, the outer side end surface of the outer protective layer is covered with pressure-resistant layer, the outer side end surface of the pressure-resistant layer is covered with wear-resistant outer sleeve layer, the utility model forms longitudinal reinforcing rib structure by support ring body, improves axial compression resistance, so that cable conduit can withstand greater pressure without appearing to flatten, and it is provided with pressure-resistant strip on its surface, and the two form cross protection, interact to further improve the compression strength of cable conduit, the layered structure of overall design forms the four-level protection system of " inner tube support-support ring body reinforcement-pressure-resistant strip dispersion-flexible filler buffer", effectively guarantee the compression strength of cable conduit.

Description

Technical Field

[0001] This utility model relates to the field of cable conduits, and in particular to a high-pressure-resistant Mpp composite cable conduit. Background Technology

[0002] With the upgrading and renovation of urban power grids and the construction of underground integrated pipe corridors, municipal engineering projects are placing increasingly higher demands on the performance of cable protection pipes. Traditional cable conduits (such as PVC pipes and PE pipes) generally suffer from insufficient ring stiffness (SN4-SN8) and low compressive strength (typically <30kN / m). 2 Due to problems such as poor wear resistance, pipes are prone to failures such as crushing, excessive radial deformation (>5%), and mechanical damage to the outer wall in heavy-load areas such as main roads and transportation hubs.

[0003] Existing technologies employing single-material reinforcement or simple corrugated structures struggle to simultaneously meet the requirements for mechanical performance, flame retardancy, and long-term durability under complex working conditions. This is especially true in applications with high backfill earth pressure (>25kN / m). 2 ) and dynamic vehicle load (>40kN / m 2 Under superimposed working conditions, conventional pipes are prone to local collapse due to stress concentration, and lack an effective impact energy absorption mechanism, which seriously affects the safe operation of cable lines. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure-resistant Mpp composite cable conduit to solve the problems mentioned in the background art.

[0005] The technical problem solved by this utility model is achieved through the following technical solution:

[0006] A high-pressure-resistant Mpp composite cable conduit includes an inner tube layer, an outer protective layer covering the outer end face of the inner tube layer, a plurality of ribs evenly distributed on the outer protective layer, an embedded groove in the rib, a support ring embedded in the embedded groove, a pressure-resistant layer covering the outer end face of the outer protective layer, and a wear-resistant outer jacket layer covering the outer end face of the pressure-resistant layer.

[0007] Preferably, the outer surface of the compression-resistant layer is provided with a plurality of compression-resistant strips at equal intervals.

[0008] Preferably, the compression strip is configured as a cylinder with an elliptical cross-section.

[0009] Preferably, a filling cavity is formed between the pressure-resistant layer, the pressure-resistant strip, and the wear-resistant outer layer, and the filling cavity is filled with flexible flame-retardant filler.

[0010] Preferably, the support ring is made of steel strip.

[0011] Preferably, the outer surface of the wear-resistant outer jacket is coated with a wear-resistant coating, which is a polymer ceramic coating.

[0012] The advantages and positive effects of this utility model are:

[0013] This invention utilizes a longitudinally reinforcing rib structure formed by a supporting ring to enhance axial compressive strength, enabling the cable conduit to withstand greater pressure without flattening. Furthermore, anti-compression strips are installed on its surface, creating a cross-protective effect that further enhances the compressive strength of the cable conduit. Compared to traditional cable conduits, its compressive strength is increased several times. The overall layered design forms a four-level protection system: "inner tube support - supporting ring reinforcement - anti-compression strip dispersion - flexible filler buffer," effectively ensuring the compressive strength of the cable conduit. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of a high-pressure-resistant Mpp composite cable conduit according to this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the internal structure of a high-pressure-resistant Mpp composite cable conduit according to this utility model;

[0017] Figure 3 This is a schematic diagram of the main cross-sectional structure of a high-pressure-resistant Mpp composite cable conduit according to this utility model;

[0018] Figure 4 This is a schematic diagram of the outer protective layer in a high-pressure-resistant Mpp composite cable conduit according to this utility model.

[0019] The markings in the attached diagram are described as follows: Inner tube layer 10; Outer protective layer 11; Raised rib 12; Support ring 13; Pressure-resistant layer 14; Pressure-resistant strip 15; Wear-resistant outer layer 16; Inner groove 17; Filling cavity 18. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in an illustrative manner. Therefore, they only show the components related to the present invention.

[0021] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0022] The following is combined with Figure 1-4 This utility model will be described in detail below. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 3 The directions of front, back, left, right, up, and down in the view are consistent. Figure 3 The directions shown are consistent with the front-facing, back-facing, left-right, up-down directions of the device.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0025] Please see Figure 1-4This utility model provides an embodiment of a high-pressure-resistant Mpp composite cable conduit, comprising an inner tube layer 10, an outer protective layer 11, a pressure-resistant layer 14, and a wear-resistant outer jacket layer 16. The inner tube layer 10 is in direct contact with the cable, providing a smooth inner wall to reduce cable friction loss and ensure smooth cable laying. Modified polypropylene can be selected as the inner tube layer 10 to meet the cable heating conditions and has a low coefficient of friction. The outer protective layer 11 covers the outer end face of the inner tube layer 10, and several convex ribs 12 are evenly distributed on the outer protective layer 11 to form a longitudinal reinforcing rib structure, improving axial pressure resistance and enabling the cable conduit to withstand greater pressure without flattening. It should be noted that, to further improve pressure resistance, an embedded groove 17 is provided in the convex rib 12, and a support ring 13 is embedded in the embedded groove 17. The support ring has strong compressive strength and can be made of bent steel strip or metal mesh, significantly enhancing ring stiffness (up to SN12 level or above) and preventing radial deformation. The outer protective layer 11 can be made of high-density polyethylene (HDPE) and 30% glass fiber reinforcement. A pressure-resistant layer 14 is provided on the outer end face of the outer protective layer 11. Several pressure-resistant strips 15 are evenly distributed on the outer surface of the pressure-resistant layer 14. The pressure-resistant strips 15 and the support ring 13 form cross protection, and the interaction between the two further improves the compressive strength of the cable conduit. A wear-resistant outer jacket 16 is provided on the outer end face of the pressure-resistant layer 14, and the outer surface is coated with a high-molecular ceramic polymer coating as a wear-resistant coating. The surface hardness can reach 6H, the wear resistance is 5-8 times that of ordinary PE, and the weather resistance is improved by more than 3 times (no cracking after 3000h of UV irradiation).

[0026] It is worth mentioning that, in this embodiment, the pressure-resistant strip 15 is configured as a column with an elliptical cross-section, forming a multi-arched pressure-bearing structure, which can disperse the vertical pressure.

[0027] It should be noted that, in this embodiment, a filling cavity 18 is formed between the compression-resistant layer 14, the compression-resistant strip 15, and the wear-resistant outer layer 16. The filling cavity 18 is filled with flexible flame-retardant filler, thus providing both buffering (absorbing 10-15% of impact energy) and fire resistance (oxygen index ≥32). The layered structure design achieves stress gradient distribution, improving the overall compressive strength (up to 50kN / m). 2 ).

[0028] In practical implementation, when cables need to be laid under main roads to alleviate power supply pressure in the central area, the cable conduits need to have high compressive strength due to the large number of vehicles passing by on the ground. When using the cable conduit of this invention, a rib structure with an embedded steel strip supporting ring (SN12 ring stiffness) is adopted, combined with a multi-arched compressive strip design in the compressive layer, which can withstand the underground soil pressure (30kN / m). 2) and ground vehicle dynamic load (equivalent to 50kN / m 2 To prevent pipe flattening or radial deformation, the flexible flame-retardant filler in the filling cavity absorbs impact energy and addresses local stress concentration caused by uneven backfilling during construction. The wear-resistant outer layer with a high-molecular ceramic polymer coating (hardness 6H) resists underground sand and gravel friction and mechanical pipe jacking construction damage, avoiding the problem of easy scratching of traditional PE pipes. The HDPE+30% glass fiber outer protective layer is resistant to soil salt and alkali corrosion and has a service life of more than 50 years.

[0029] It should be emphasized that the embodiments described in this utility model are illustrative rather than limiting. Therefore, this utility model is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this utility model are also within the scope of protection of this utility model.

Claims

1. A high-pressure-resistant Mpp composite cable conduit, comprising an inner tube layer (10), characterized in that: An outer protective layer (11) is provided on the outer end face of the inner tube layer (10). A plurality of protruding ribs (12) are provided on the outer protective layer (11) at equal intervals. An inner groove (17) is provided in the protruding rib (12). A support ring (13) is embedded in the inner groove (17). A pressure-resistant layer (14) is provided on the outer end face of the outer protective layer (11). A wear-resistant outer jacket layer (16) is provided on the outer end face of the pressure-resistant layer (14).

2. The high-pressure-resistant Mpp composite cable conduit according to claim 1, characterized in that: The outer surface of the pressure-resistant layer (14) is provided with several pressure-resistant strips (15) distributed at equal intervals.

3. The high-pressure-resistant Mpp composite cable conduit according to claim 2, characterized in that: The compression strip (15) is configured as a cylinder with an elliptical cross-section.

4. The high-pressure-resistant Mpp composite cable conduit according to claim 3, characterized in that: A filling cavity (18) is formed between the pressure-resistant layer (14), the pressure-resistant strip (15) and the wear-resistant outer layer (16), and the filling cavity (18) is filled with flexible flame-retardant filler.

5. The high-pressure-resistant Mpp composite cable conduit according to claim 1, characterized in that: The supporting ring (13) is a steel strip or a metal mesh.

6. The high-pressure-resistant Mpp composite cable conduit according to claim 1, characterized in that: The outer surface of the wear-resistant outer jacket (16) is coated with a wear-resistant coating, which is a polymer ceramic coating.

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