CN112398076A - Buried high-strength pressure-resistant power cable protection sleeve and protection sleeve assembly thereof - Google Patents
Buried high-strength pressure-resistant power cable protection sleeve and protection sleeve assembly thereof Download PDFInfo
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- CN112398076A CN112398076A CN202011434850.4A CN202011434850A CN112398076A CN 112398076 A CN112398076 A CN 112398076A CN 202011434850 A CN202011434850 A CN 202011434850A CN 112398076 A CN112398076 A CN 112398076A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0468—Corrugated
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention provides a buried high-strength pressure-resistant power cable protective sleeve and a protective sleeve assembly thereof, wherein the power cable protective sleeve comprises an inner tube and an outer tube, the outer tube comprises wave crests and wave troughs which are alternately arranged on the outer side of the inner tube, the wave troughs are in contact with the outer wall of the inner tube, the cross sections of the wave troughs and the inner tube are circular, and the cross sections of the wave crests are polygonal; the corner of the wave crest is of an inwards concave arc structure, two ends of the inwards concave arc structure are arc chamfers which are in smooth transition with the outer wall of the wave crest, the outer wall of the wave trough is longitudinally provided with a first reinforcing structure, the end part of the first reinforcing structure is connected with the side surface of the arc chamfers, and the outer wall of the wave trough is transversely provided with a second reinforcing structure which is in cross connection with the first reinforcing structure; the inner diameter of the inner tube is 50-250 mm. The power cable protective sleeve has better mechanical strength and pressure resistance, so that the power cable protective sleeve can be universally used in green belts, pedestrian road sections and various high-pressure driving road sections.
Description
Technical Field
The invention relates to the technical field of power cable protective sleeves, in particular to a buried high-strength pressure-resistant power cable protective sleeve and a protective sleeve assembly thereof.
Background
The power cable protective sleeve is the most commonly used electric insulating tube for protecting wires and cables, and has the advantages of good insulating property, high chemical stability, good acid and alkali resistance, adaptability to the north and south environments and the like. In recent years, with the rapid progress of power cable burying works, higher demands have been made on the pressure resistance of buried power cable protective sleeves.
However, the ring stiffness of existing buried power cable protective sleeves can only typically reach 25-50kN/m2Therefore, the existing buried power cable protective sleeve has the defects of insufficient mechanical strength, poor pressure resistance and the like, and cannot be well adapted to the pressure resistance requirement of motor vehicles, particularly intensive high-pressure forced vehicle road sections of freight vehicles, so that the use of the protective sleeve is limited.
Disclosure of Invention
One of the purposes of the invention is to provide a buried high-strength pressure-resistant power cable protective sleeve aiming at the defects of the prior art, so as to further enhance the mechanical strength and pressure resistance of the power cable protective sleeve, further enable the power cable protective sleeve to be universally used in green belts, pedestrian road sections and various high-pressure driving road sections, solve the problem that different types of pipes are required for digging the buried cable protective sleeve in different green belts, pedestrian roads and driving road sections by the traditional cable protective sleeve, and save time and labor.
The invention also aims to overcome the defects of the prior art and provides a power cable protective sleeve assembly for communicating two adjacent buried high-strength pressure-resistant power cable protective sleeves.
Based on the technical scheme, the invention discloses a buried high-strength pressure-resistant power cable protection sleeve, which comprises an inner pipe and an outer pipe; the outer pipe comprises wave crests and wave troughs which are alternately arranged on the outer side of the inner pipe along the longitudinal direction of the outer pipe, the wave troughs are in contact with the outer wall of the inner pipe, the cross sections of the wave troughs and the inner pipe are circular, and the cross sections of the wave crests are polygonal; the corner of the wave crest is of an inwards concave arc structure, two ends of the inwards concave arc structure are arc chamfers which are in smooth transition with the outer wall of the wave crest, the outer wall of the wave trough is longitudinally provided with a first reinforcing structure, the end part of the first reinforcing structure is connected with the side surfaces of the arc chamfers, and the outer wall of the wave trough is transversely provided with a second reinforcing structure which is in cross connection with the first reinforcing structure; the inner diameter of the inner pipe is 50-250 mm.
Preferably, the cross section of the peak is hexagonal, heptagonal, octagonal, nonagonal, decagonal, undecamide or dodecagonal.
Preferably, the wave crest is transversely provided with an arc-shaped groove.
Preferably, each circular arc chamfer is connected with the first reinforcing structure, and the first reinforcing structure is columnar; the upper surface of the first reinforcing structure is flush with the upper surface of the arc chamfer.
Preferably, the upper surface of the second reinforcing structure is flush with the upper surface of the first reinforcing structure; the second reinforcing structure is columnar, and the shape of the cross section of the second reinforcing structure is the same as that of the cross section of the wave crest.
Preferably, the buried high-strength pressure-resistant power cable protective sleeve is prepared by taking modified polypropylene as a main raw material, wherein the modified polypropylene comprises the following raw materials in parts by weight:
wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
25-29 parts of light calcium carbonate
2.4-2.6 parts of nano calcium carbonate
0.5-3 parts of polypropylene grafted maleic anhydride;
the preparation steps of the modified calcium carbonate are as follows:
dispersing 0.5-3 parts of polypropylene grafted maleic anhydride in pure water, sequentially adding 2.4-2.6 parts of nano calcium carbonate and 25-29 parts of light calcium carbonate, ultrasonically dispersing for 90-120min, drying in a vacuum oven at 50-60 ℃ for 2-3h, and cooling to room temperature to obtain modified calcium carbonate;
wherein, the toughening agent is polyolefin elastomer grafted acrylic acid.
Further preferably, the toughening agent is butadiene rubber grafted acrylic acid;
the antioxidant is 1010;
the coupling agent is gamma-aminopropyl triethoxysilane;
the lubricant is pentaerythritol stearate.
Further preferably, the modified polypropylene comprises the following raw materials in parts by weight:
further preferably, the modified calcium carbonate comprises the following raw materials in parts by weight:
light calcium carbonate 25.5 parts
2.5 parts of nano calcium carbonate
And 2 parts of polypropylene grafted maleic anhydride.
Preferably, the inner diameter of the inner tube is 50mm, or 100mm, or 150mm, or 175mm or 200mm, or 250 mm.
The invention also discloses a power cable protective sleeve assembly which comprises a plurality of buried high-strength pressure-resistant power cable protective sleeves, and the two end parts of the inner pipe are respectively provided with a connecting part extending outwards so as to enable the two adjacent buried high-strength pressure-resistant power cable protective sleeves to be communicated.
The connecting parts of the two adjacent buried high-strength pressure-resistant power cable protective sleeves can be fixedly connected in a hot-melting welding spot connection mode. Or the connecting parts of the two adjacent buried high-strength pressure-resistant power cable protective sleeves are fixedly connected in a buckling connection mode.
Preferably, the power cable protective sleeve assembly further comprises a sealing rubber ring sleeved on the outer walls of two adjacent buried high-strength pressure-resistant power cable protective sleeves, and a buckle connecting pipe sleeved on the outer wall of the sealing rubber ring.
Further preferably, the cross-sectional shape of the snap connection pipe is the same as the cross-sectional shape of the wave crest; the two end parts of the buckle connecting pipe are provided with bending parts which are folded towards the middle and clamped in the wave troughs.
Compared with the prior art, the invention at least comprises the following beneficial effects:
compared with a single-wall sleeve, the power cable protective sleeve comprises an inner pipe and an outer pipe, is a double-wall sleeve with an outer corrugated structure and an inner flat-wall structure, plays a role in protecting buried cables and optical cables in a double-layer mode, and is higher in mechanical strength and better in pressure resistance; when the outer pipe is pressed by the road surface, the stress area of the outer pipe can be increased by adopting the changeable wave crests and wave troughs on the transverse surface, and the compression resistance of the outer pipe is improved; compared with the outer pipe with the same radius and the round or square cross section, the cross section of the outer pipe is a polygonal wave crest, so that the stress area of the outer pipe can be further increased, and the pressure resistance of the power cable protective sleeve is effectively improved; in addition, the power cable protective sleeve is provided with the concave arc structure at the corner of the wave crest, so that the defects of depression, damage and the like caused by the impact of external force on the corner of the wave crest can be effectively avoided, and the mechanical strength of the concave arc structure is greatly improved; compared with the mode that an outward convex chamfer is arranged at the corner of the wave crest, two arc chamfers are arranged at two ends of the inward concave arc structure, and the increased arc chamfers can share part of pressure; the side of this circular arc chamfer is connected with first additional strengthening, can effectively share this circular arc chamfer's partial pressure, and vertically and horizontally staggered's first additional strengthening and second additional strengthening can, can further promote this power cable protective case's mechanical strength and compressive property for this power cable protective case can be general in greenbelt, pedestrian's section and various high-pressure's driving highway section.
Drawings
Fig. 1 is a perspective view of a power cable protective sleeve of the present invention.
Fig. 2 is a front view of the power cable protective sleeve of the present invention.
Fig. 3 is a side view of the power cable protective sleeve of the present invention.
Fig. 4 is a cross-sectional view of the power cable protective sleeve of the present invention at a-a in fig. 3.
Fig. 5 is a schematic partial perspective view of a power cable protective sleeve assembly of the present invention.
The reference numbers illustrate: 1, an inner tube; 11 a connecting part; 2, an outer tube; 21 wave crest; 211 an arc-shaped groove; 212 concave arc structure; 213 arc chamfering; 22 wave troughs; 221 a first reinforcing structure; 222 a second reinforcing structure; 3, sealing the rubber ring; 4, buckling a connecting pipe; 41 curved portion.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
The buried high-strength pressure-resistant power cable protection sleeve of the embodiment, referring to fig. 1-2, comprises an inner pipe 1 and an outer pipe 2, which are double-wall sleeves with an outer ripple and inner flat-wall structure, and compared with a single-wall sleeve, the double-wall sleeve plays a role in double-layer protection of buried cables and optical cables, and has higher mechanical strength and better pressure resistance. The outer tube 2 comprises wave crests 21 and wave troughs 22 alternately arranged on the outer side of the inner tube 1 along the longitudinal direction thereof; therefore, when the outer tube is pressed by the road surface, the stress area of the outer tube 2 can be increased by adopting the wave crests 21 and the wave troughs 22, and the compression resistance of the outer tube is improved; moreover, the wave crests 21 and the wave troughs 22 are adopted by the outer tube 2, so that the heat dissipation area can be increased, and the heat dissipation speed can be increased. In order to further increase the force bearing area of the outer tube 2, the wave crest 21 is transversely provided with an annular arc-shaped groove 211.
Referring to fig. 3-4, the wave trough 22 is close to the outer wall of the inner tube 1, and the cross sections of the wave trough 22 and the inner tube 1 are circular; therefore, the inner wall of the circular inner pipe 1 is smooth, and wires and cables can be conveniently threaded. Wherein, the inner diameter of the inner tube 1 is 50-250mm, and the inner diameter of the inner tube 1 is preferably 200 mm; or the inner diameter of the inner tube 1 is changed to 50 mm; or the inner diameter of the inner tube 1 is changed to 100 mm; or the inner diameter of the inner tube 1 is changed to 150 mm; or the inner diameter of the inner tube 1 is changed to 175 mm; or the inner diameter of the inner tube 1 is changed to 200 mm; or the inner diameter of the inner tube 1 is changed to 250 mm.
Referring to fig. 4, the cross-section of the peak 21 is hexagonal; therefore, the pipe pillow does not need to be used for fixing during installation and construction, the workload is greatly reduced, the pipe pillow is saved, and the construction cost is reduced; moreover, compared with the outer tube with the same radius and the round or square cross section, the hexagonal cross section wave crest 21 can further increase the stress area of the outer tube 2 and effectively improve the pressure resistance of the power cable protective sleeve. Or, the cross section of the peak 21 is heptagon; or the cross section of the wave peak 21 is octagonal; or the cross section of the wave peak 21 is nonagon; or the cross section of the peak 21 is decagon; or the cross section of the peak 21 is an undegon; or alternatively the cross-section of the peaks 21 is dodecagonal.
Referring to fig. 1 and 3, the power cable protective sleeve sets the corners of the wave peak 21 as the concave arc structures 212, so that the defects of dent, damage and the like caused by external impact on the corners of the wave peak 21 can be effectively avoided, and the mechanical strength of the concave arc structures 212 is greatly improved. Both ends of the concave arc structure 212 are provided with an arc chamfer 213 which is in smooth transition with the outer wall of the wave crest 21, compared with the mode that an outward convex chamfer is arranged at the corner of the wave crest, the two ends of the concave arc structure 212 have two arc chamfers 213, and the increased arc chamfers 213 can share part of pressure. Referring to fig. 1 and 2, the outer wall of the wave trough 22 is longitudinally provided with a first reinforcing structure 221, the end of the first reinforcing structure 221 is connected with the side of the arc chamfers 213, and preferably, each arc chamfers 213 is connected with the first reinforcing structure 221; the first reinforcing structure 221 can effectively share a part of the pressure of the arc chamfer 213, thereby improving the mechanical strength and pressure resistance of the power cable protective sleeve. Therefore, the power cable protective sleeve can be universally used in green belts, pedestrian road sections and various high-voltage driving road sections, and the application of the power cable protective sleeve is expanded. Specifically, the first reinforcing structure 221 has a cylindrical shape. The upper surface of the first reinforcing structure 221 may be lower than the upper surface of the rounded chamfer 213; alternatively, it is preferable that the upper surface of the first reinforcing structure 221 is flush with the upper surface of the rounded chamfer 213.
Referring to fig. 1 and 2, in order to improve the pressure resistance of the power cable protective sleeve, the outer walls of the wave troughs 22 are further provided with second reinforcing structures 222 transversely connected with the first reinforcing structures 221. The upper surface of the second reinforcing structure 222 is preferably flush with the upper surface of the first reinforcing structure 221 to share the external pressure applied to the first reinforcing structure 221; the second reinforcing structure 222 is in a column shape, and the cross-sectional shape of the second reinforcing structure 222 is the same as the cross-sectional shape of the wave crest 21, so as to further improve the pressure resistance of the power cable protective sleeve.
The buried high-strength pressure-resistant power cable protection sleeve is prepared by taking modified polypropylene as a main raw material, wherein the modified polypropylene comprises the following raw materials in parts by weight:
wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
light calcium carbonate 25.5 parts
2.5 parts of nano calcium carbonate
And 2 parts of polypropylene grafted maleic anhydride.
Wherein the toughening agent is butadiene rubber grafted acrylic acid; the antioxidant is antioxidant 1010; the coupling agent is gamma-aminopropyl triethoxysilane; the lubricant is pentaerythritol stearate.
The preparation steps of the modified polypropylene are as follows:
s1 preparation of modified calcium carbonate: and dispersing the polypropylene grafted maleic anhydride in the pure water according to the formula amount, sequentially adding the nano calcium carbonate and the light calcium carbonate according to the formula amount, ultrasonically dispersing for 90-120min, drying in a vacuum oven at 50-60 ℃ for 2-3h, and cooling to room temperature to obtain the modified calcium carbonate.
S2 preparation of modified polypropylene: uniformly mixing the polypropylene resin, the modified calcium carbonate, the toughening agent, the antioxidant, the coupling agent and the lubricant according to the formula ratio, and then melting, extruding and granulating the mixture by a double-screw extruder to obtain the polypropylene modified calcium carbonate. Wherein the diameter of the screw is 68mm, the length-diameter ratio is 25: 1, the rotating speed of the screw is 120r/min, and the extrusion temperature is 180-220 ℃.
The modified polypropylene is prepared by carrying out surface modification on nano calcium carbonate and light calcium carbonate by adopting polypropylene grafted maleic anhydride to obtain modified calcium carbonate so as to promote uniform dispersion of the modified calcium carbonate in polypropylene resin; the nano calcium carbonate and the light calcium carbonate in the modified calcium carbonate can play a role in synergy, so that the strength and the heat resistance of the polypropylene resin are effectively improved; in addition, in order to adapt to the construction of the power cable protective sleeve at a corner, the modified polypropylene takes butadiene rubber grafted acrylic acid as a toughening agent, the toughening agent is added into polypropylene resin, and then a coupling agent, an antioxidant and a lubricant are matched, so that the modified polypropylene with excellent strength, toughness and heat resistance can be prepared, and the construction and use requirements of the power cable protective sleeve of a high-pressure forced driving road section and a turning passage can be met.
Example 2
The buried high-strength pressure-resistant power cable protective sleeve of the embodiment is basically the same as the embodiment 1, and is different from the embodiment 1 in that the modified polypropylene comprises the following raw materials in parts by weight:
wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
light calcium carbonate 25 parts
2.4 parts of nano calcium carbonate
0.5 part of polypropylene grafted maleic anhydride.
Example 3
The buried high-strength pressure-resistant power cable protective sleeve of the embodiment is basically the same as the embodiment 1, and is different from the embodiment 1 in that the modified polypropylene comprises the following raw materials in parts by weight:
wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
29 portions of light calcium carbonate
2.6 parts of nano calcium carbonate
3 parts of polypropylene grafted maleic anhydride.
Example 4
A power cable protective sleeve assembly of this embodiment, see fig. 1-2 and fig. 5, includes a plurality of buried high-strength voltage-resistant power cable protective sleeves of embodiment 1, and both ends of the inner pipe 1 are provided with connecting portions 11 extending outward, so that two adjacent buried high-strength voltage-resistant power cable protective sleeves are communicated.
Wherein, the connecting parts 11 of two adjacent buried high-strength pressure-resistant power cable protective sleeves can be fixedly connected in a hot-melting welding spot connection mode. Or two adjacent buried high-strength pressure-resistant power cable protective sleeves are fixedly connected in a buckling connection mode; the method comprises the following specific steps: this power cable protective case subassembly, including sealed rubber ring 3 and buckle connecting pipe 4, during the connection, earlier locate the outer wall of two adjacent withstand voltage power cable protective case of ground formula high strength with 3 covers of sealed rubber ring, locate the outer wall of sealed rubber ring 3 with 4 covers of this buckle connecting pipe again. Specifically, in order to make the snap connection more stable and firm, the two ends of the snap connection tube 4 are further provided with bending parts 41 which are folded towards the middle and are clamped in the wave troughs 22; and the cross section shape of the buckle connecting pipe 4 is the same as that of the wave crest 21, so that the friction area between the buckle connecting pipe 4 and the outer wall of the wave crest 21 can be increased, and the buckle connecting mode is more stable and firm. The snap connection pipe 4 is preferably formed by processing the modified polypropylene of the embodiments 1 to 3 as a main raw material.
Comparative example 1
The power cable protective sleeve of this comparative example is substantially the same as example 1, except that the raw material modified calcium carbonate in the modified polypropylene includes 28 parts of light calcium carbonate and 2 parts of polypropylene-grafted maleic anhydride, and does not contain nano calcium carbonate, as in example 1.
Comparative example 2
The power cable protective sleeve of this comparative example is substantially the same as example 1, except that the raw material butadiene rubber graft acrylic acid of the modified polypropylene in example 1 was replaced with butadiene rubber.
Performance test the performance test was performed on the power cable protective sleeves of examples 1 to 3 and comparative examples 1 to 2, and the test results are shown in the following tables 1 to 2; the size specification of the power cable protective sleeve used for the test is as follows: the nominal inner diameter is 200mm, the minimum average inner flat wall thickness is 1.8mm, the minimum outer shape side length is 242mm, and the maximum outer shape side length is 246 mm.
TABLE 1
TABLE 2
| Comparative example 1 | Comparative example 2 | Example 1 | |
| Ring stiffness (23+2) deg.C | 61kN/m2 | 55kN/m2 | 71kN/m2 |
| Radius of curvature | 13D | 16D | 19D |
As can be seen from tables 1 to 2, the power cable protective sleeves of examples 1 to 3 have high loop stiffness, good pressure resistance, and excellent bending radius, and can meet the requirements of construction and use of power cable protective sleeves for high-voltage forced driving roads and turning passages.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A buried high-strength pressure-resistant power cable protective sleeve is characterized by comprising an inner pipe and an outer pipe; the outer pipe comprises wave crests and wave troughs which are alternately arranged on the outer side of the inner pipe along the longitudinal direction of the outer pipe, the wave troughs are in contact with the outer wall of the inner pipe, the cross sections of the wave troughs and the inner pipe are circular, and the cross sections of the wave crests are polygonal; the corner of the wave crest is of an inwards concave arc structure, two ends of the inwards concave arc structure are arc chamfers which are in smooth transition with the outer wall of the wave crest, the outer wall of the wave trough is longitudinally provided with a first reinforcing structure, the end part of the first reinforcing structure is connected with the side surfaces of the arc chamfers, and the outer wall of the wave trough is transversely provided with a second reinforcing structure which is in cross connection with the first reinforcing structure; the inner diameter of the inner pipe is 50-250 mm.
2. A buried high strength pressure-resistant power cable protective sleeve according to claim 1, wherein the cross section of the wave crests is hexagonal, heptagonal, octagonal, nonagonal, decagonal, undecamberic, or dodecagonal;
the inner diameter of the inner tube is 50mm, or 100mm, or 150mm, or 175mm or 200mm, or 250 mm.
3. A buried high strength pressure-resistant power cable protective sleeve according to claim 1, wherein the wave crests are transversely provided with arc-shaped grooves.
4. The underground high-strength pressure-resistant power cable protective sleeve as claimed in claim 1, wherein each of the arc chamfers is connected with the first reinforcing structure, and the first reinforcing structure is columnar; the upper surface of the first reinforcing structure is flush with the upper surface of the arc chamfer.
5. A buried high strength pressure resistant power cable protective sleeve according to claim 1 wherein the upper surface of the second reinforcing structure is flush with the upper surface of the first reinforcing structure; the second reinforcing structure is columnar, and the shape of the cross section of the second reinforcing structure is the same as that of the cross section of the wave crest.
6. The underground high-strength pressure-resistant power cable protective sleeve as claimed in claim 1, which is prepared from modified polypropylene as a main raw material, wherein the modified polypropylene comprises the following raw materials in parts by weight:
wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
25-29 parts of light calcium carbonate
2.4-2.6 parts of nano calcium carbonate
0.5-3 parts of polypropylene grafted maleic anhydride;
wherein, the toughening agent is polyolefin elastomer grafted acrylic acid.
7. The buried high-strength pressure-resistant power cable protective sleeve as claimed in claim 6, wherein the modified polypropylene comprises the following raw materials in parts by weight:
8. the buried high-strength pressure-resistant power cable protective sleeve as claimed in claim 6 or 7, wherein the modified calcium carbonate comprises the following raw materials in parts by weight:
light calcium carbonate 25.5 parts
2.5 parts of nano calcium carbonate
2 parts of polypropylene grafted maleic anhydride;
the toughening agent is butadiene rubber grafted acrylic acid.
9. A power cable protective sleeve assembly comprising a plurality of buried high strength pressure resistant power cable protective sleeves according to any one of claims 1 to 8, wherein each end of the inner tube is provided with an outwardly extending connecting portion to connect two adjacent buried high strength pressure resistant power cable protective sleeves.
10. The power cable protection sleeve assembly as claimed in claim 9, further comprising a sealing rubber ring sleeved on the outer wall of two adjacent buried high strength pressure-resistant power cable protection sleeves, and a snap-fit connection pipe sleeved on the outer wall of the sealing rubber ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434850.4A CN112398076B (en) | 2020-12-10 | 2020-12-10 | Buried high-strength pressure-resistant power cable protection sleeve and protection sleeve assembly thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434850.4A CN112398076B (en) | 2020-12-10 | 2020-12-10 | Buried high-strength pressure-resistant power cable protection sleeve and protection sleeve assembly thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112398076A true CN112398076A (en) | 2021-02-23 |
| CN112398076B CN112398076B (en) | 2022-12-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117028683A (en) * | 2023-08-25 | 2023-11-10 | 广东安恒塑业有限公司 | High-strength compression-resistant composite pipe using plastic to replace steel and forming die thereof |
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| CN112398076B (en) | 2022-12-30 |
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