Buried diamond-shaped cable protection composite sleeve with high compressive strength and external force resistance and sleeve assembly

Abstract

The present invention discloses a buried diamond-shaped cable protection composite sleeve and a sleeve assembly with high compressive resistance and external force resistance, which are used for buried cable installation. It includes an inner wall for placing the cable and providing the innermost layer of protection for the cable, and an outer wall located outside the outer circle of the inner wall; the outer wall includes outer wall wave valleys and outer wall wave peaks providing the outermost layer of protection. The outer wall wave valleys include inner wave valleys providing a secondary outer layer of protection and protection members arranged on the outer surface of the inner wave valleys for providing at least one secondary outer layer of protection. The present invention has a total of four layers of protection, which can more effectively cope with various pressure situations required after the cable is buried; the protection members covered on the outer surface of the inner wave valleys can improve the ring stiffness of the entire outer circle of the outer wall wave valleys, that is, can effectively improve the overall strength and bearing capacity of the outer wall.

Description

Technical Field

[0001] The present invention belongs to the field of cable protection, and particularly relates to a buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance and a sleeve assembly. Background Art

[0002] At present, with the rapid development of the project of burying power cables, higher requirements such as higher strength are put forward for cable sleeves. In order to ensure that the sleeve can protect the cable, commonly used are plastic pipes, generally made of polyvinyl chloride plastic or U-PVC. The specific structural design mostly adopts a double-wall structure, that is, an outer wall and an inner wall. Although the double-wall can greatly increase the overall strength and stiffness of the plastic pipe, if the outer wall is damaged due to excessive external pressure, the inner wall, as the layer closest to the sleeve, has too small a load-bearing and resistance function, and a single inner wall cannot protect the cable.

[0003] Therefore, the prior art needs to be improved. Summary of the Invention

[0004] The main purpose of the present invention is to provide a buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance and a sleeve assembly to solve the technical problem that the outer wall in the double-wall structure in the background art is easily damaged due to excessive external pressure.

[0005] In the first aspect of the present invention, there is provided a buried diamond-shaped cable protection composite sleeve for burying cables, including an inner wall for placing the cable and providing the innermost layer of protection for the cable and an outer wall located outside the outer circle of the inner wall; the outer wall includes an outer wall wave valley and an outer wall wave peak providing the outermost layer of protection, and the outer wall wave valley includes an inner wave valley providing a secondary outermost layer of protection and a protection member provided on the outer surface of the inner wave valley for providing at least one secondary outermost layer of protection.

[0006] On the basis of the first aspect, the outer wall wave peak has a first hollow area for placing the inner wall, and eight wave peak components for providing the outermost layer of protection are formed outside the periphery of the first hollow area.

[0007] On the basis of the first aspect, the radial cross-section of the wave peak component is square.

[0008] On the basis of the first aspect, the radial cross-section of the inner wave valley is annular, and the protection member covers at least a section of the outer circle of the annulus.

[0009] On the basis of the first aspect, the protection member is a strip-shaped rib, and the strip-shaped rib is connected between adjacent outer wall wave valleys.

[0010] On the basis of the first aspect, the protection member is at least one turn of annular rib, and the annular rib is laid around the outer surface of the inner wave valley.

[0011] Based on the first aspect, the protective casing is made of modified polypropylene as the main raw material, and the modified polypropylene comprises the following raw materials in parts by weight:

[0012]

[0013] Among them, the modified calcium carbonate comprises the following raw materials in parts by weight:

[0014] Light calcium carbonate 23 - 28 parts

[0015] Nano calcium carbonate 2 - 3 parts

[0016] Polypropylene grafted maleic anhydride 0.5 - 1.5 parts.

[0017] Based on the first aspect, the toughening agent is polyolefin elastomer grafted with acrylic acid.

[0018] Based on the first aspect, the inner wall, inner trough, protective member and outer wall peak are distributed from inside to outside in the axial direction of the cable.

[0019] In the second aspect of the present invention, there is provided a casing assembly, comprising a plurality of the above-mentioned buried high - compressive - strength and anti - external - force diamond - shaped cable protection composite casings, and the plurality of buried high - compressive - strength and anti - external - force diamond - shaped cable protection composite casings are connected by snap - fasteners or by hot - melting.

[0020] The beneficial effects of the buried high - compressive - strength and anti - external - force diamond - shaped cable protection composite casing of the present invention are as follows:

[0021] 1. The protective member formed on the outer surface of the inner trough in the outer wall can provide at least one - layer of outer protection, that is, it can improve the strength of the inner trough, and the combination of the protective member and the inner trough forms at least two - layer of outer protection. In some special cases, even if the outer wall peak is damaged, the combination of the protective member and the inner trough can still enable the outer wall to provide at least two - layer of outer protection, avoiding cable damage caused by direct contact of external pressure with the inner wall for pressure application.

[0022] 2. The outer wall peaks in the outer wall can provide the outermost protection around at least eight directions on the outer - circle side of the inner wall, that is, regardless of the application direction of external impact force and pressure, the outer wall peaks can always provide the outermost protection, serving as the first layer of barrier to resist external impact force and pressure first, and avoiding the external impact force from impacting the inner trough and the protective member first.

[0023] 3. At least four layers of protective layers can be formed based on the inner wall, inner trough, protective member and outer wall peak in the protection composite casing, improving the load - bearing effect of resisting external pressure, and protecting layer by layer to more effectively cope with external pressure.

[0024] 4. The protective composite pipe of the present invention will not cause pollution to the environment during the production process, has environmental protection, and belongs to an environmental protection product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a three-dimensional schematic diagram of the first embodiment of the buried high-compression and anti-external force diamond-shaped cable protection composite sleeve of the present invention;

[0027] Figure 2 It is the front view of the first embodiment of the buried high-compression and anti-external force diamond-shaped cable protection composite sleeve of the present invention;

[0028] Figure 3 It is a sectional view taken along the Figure 2 A-A section line in;

[0029] Figure 4 It is the structural schematic diagram of the first embodiment of the buried high-compression and anti-external force diamond-shaped cable protection composite sleeve of the present invention;

[0030] Figure 5 It is the structural schematic diagram of a protection sleeve mentioned in the prior art;

[0031] Figure 6 It is for Figure 5 The mapping schematic diagrams of three conventional sizes corresponding to the existing such protection sleeves shown;

[0032] Figure 7 It is the structural schematic diagram marked with dimensions of one specification of the buried high-compression and anti-external force diamond-shaped cable protection composite sleeve of the present invention;

[0033] Figure 8 It is the schematic diagram of buckling connection of multiple buried high-compression and anti-external force diamond-shaped cable protection composite sleeves of the present invention;

[0034] Figure 9 It is the schematic diagram of hot-melt connection of multiple buried high-compression and anti-external force diamond-shaped cable protection composite sleeves of the present invention.

[0035] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0037] It should be noted that related terms such as "first", "second", etc. can be used to describe various components, but these terms do not limit the components. These terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component can be referred to as the second component, and similarly, the second component can also be referred to as the first component. The term "and / or" refers to any combination of one or more of the related items and the described items.

[0038] First Embodiment

[0039] As Figure 1 、 Figure 2 、 Figure 3 shown, the buried diamond-shaped cable protection composite sleeve with high compressive strength and external force resistance of the present invention is used to protect cables; it includes an inner wall 20 that provides the innermost layer of protection and has an inner cavity 21 for accommodating the cable, and an outer wall 30 located outside the outer circle of the inner wall 20; the inner wall 20 and the outer wall 30 are distributed from the inside to the outside in the radial direction of the cable; based on the settings and position distributions of the inner and outer walls, the two protective walls can provide double-layer protection for the cable inside and outside, and are extremely suitable for being buried to ensure the structural integrity and stability of the cables buried under most driving environment roads. Among them, the inner wall 20 and the outer wall 30 can be integrally extruded and formed to form an integral structure to enhance the connection firmness of the inner and outer walls.

[0040] Among them, for the inner wall 20, as the protective layer closest to the cable, it is generally a hollow cylinder as a whole, and the hollow part is the inner cavity 21 for threading a round shaft cable; the cross-sectional shape of the inner wall is circular to be suitable for most general round shaft cables; and there are no protrusions on the wall surface of the inner wall, that is, the inner wall is designed as a flat wall; it is more convenient to thread the cable, and because of the flat wall design, the contact area between the inner wall in the protective sleeve and the cable is larger and the friction is smaller, so the cable threading resistance is smaller, more convenient and easier, and the cable will not be damaged during cable threading.

[0041] Among them, at least a part of the outer wall 30 can be attached to the outer circumference of the inner wall 20. The higher the degree of attachment, the better the inner and outer layer protection effects formed; the outer wall 30 includes outer wall peaks 31 that can provide the outermost layer of protection in at least eight directions around the outer circumference of the inner wall, and outer wall valleys 32 located on the outer side of the inner wall 20; the outer wall valleys 32 include inner valleys 35 that provide a secondary outermost layer of protection and protective members 33 provided on the outer surface of the inner valleys 35 that provide at least one secondary outermost layer of protection. That is, the outer wall 30 can provide the outermost layer of protection in at least eight directions around the outer circumference of the inner wall 20 relying on the outer wall peaks 31. That is, regardless of the direction of the impact force and pressure applied from the outside, the outer wall peaks 31 can always give the outermost layer of protection to serve as the first layer of barrier to resist the external impact force and pressure first, and prevent the external impact force from first impacting the inner valleys and the protective members 33.

[0042] As Figure 3 shown, the axial cross-section of the outer wall 30 is in a regular corrugated shape. That is, the number of outer wall peaks 31 in the outer wall 30 corresponds to the number of outer wall valleys 32, and the maximum radial dimension of the outer wall peaks 31 is greater than the maximum radial dimension of the outer wall valleys 32; based on the maximum protection and maximum resistance ability that the outer wall peaks 31 can provide, it is preferred that the outer wall peaks 31 resist the external impact force faster than the outer wall valleys 32 to prevent the external impact force from first impacting the inner valleys and the protective members 33. And the outer wall valleys 32 can resist and defend against the pressure applied from the outside for the second layer. And when the protective member 33 exists, in addition to the protective member itself providing at least one additional secondary outermost layer of protection, the protective member 33 combined with the inner valley 35 forms at least two secondary outermost layers of protection, which can also improve the pressure resistance performance.

[0043] As Figure 1 shown, the protective member 33 can be a strip-shaped rib. That is, the length direction of the strip-shaped rib is along the axial direction of the inner valley 35; one end of the strip-shaped rib is connected to the side end surface of an adjacent outer wall peak, and the other end of the strip-shaped rib is connected to the opposite side end surface of an adjacent outer wall peak. That is, the protective member can also strengthen the connection firmness and toughness of two adjacent outer wall peaks, that is, it can improve the ring stiffness of the entire protective sleeve.

[0044] Among them, the number of strip-shaped ribs can be multiple, and multiple strip-shaped ribs are arranged in an array on the outer surface of the outer circumference of the same inner valley. That is, each strip-shaped rib is respectively connected between two adjacent outer wall peaks, and the intervals between adjacent strip-shaped ribs are substantially the same. It can improve the connection firmness of most regions of almost all the opposite two end surfaces on two adjacent outer wall peaks. At the same time, the strip-shaped ribs can also be stacked, that is, two strip-shaped ribs are stacked layer by layer on the outer circumference of the inner valley to form two secondary outermost layers of protection.

[0045] As Figure 3As shown, the protective member 33 can be an annular rib, which is laid around the outer surface of the inner trough, that is, the annular rib forms a closed loop sleeved on the outer radial circle of the inner trough; at the same time, there can be multiple such annular ribs, which are arranged side by side to cover the outer radial circle of the inner trough, so as to strengthen the secondary outer protection provided by the inner trough by increasing the covered surface area between the protective member and the outer surface of the inner trough, that is, the ring stiffness of the outer surface of the inner trough can be improved; similarly, there can be at least two annular ribs, and at least two annular ribs can be stacked layer by layer on the outer circle of the inner trough to form at least two layers of secondary outer protection. When there is 1 annular rib, the annular rib covers the central position of the outer surface of the inner trough, and the central position of the outer surface of the inner trough represents the central position of the outer circle of the inner trough in the radial direction. The above-mentioned annular steel bars can be detachable, that is, multiple parts of the annular steel bars can be placed in the corresponding areas on the outer surface of the inner trough 35 respectively, and then connection and fixation can be achieved based on splicing and other methods; finally, maintenance personnel can quickly and conveniently sleeved the annular steel bars on the outer surface of the outer wall trough 32. The protective member can also be a reinforcing rib with a triangular cross-section, and this common reinforcing rib structure can also achieve the improvement of the strength of the inner trough.

[0046] Among them, the protective member 33 and the inner trough 35 can be integrally designed; that is, the protective member is the convex part of the inner trough 35; the protruding direction of this convex part is from the inner wall of the inner trough 35 towards the corresponding outer wall; based on the firm connection brought by the integral design, it is beneficial to improve the overall secondary outer protection effect of the protective member 13 and the inner trough 35.

[0047] As Figure 3 shown, a buffer block (not shown in the figure) can be filled in the spaced inner cavity 34 formed between the outer wall peak 31 and the inner wall 20. After filling, a buffer space is formed between the buffer block and the inner wall of the outer wall peak 31. First, when the buffer space gives a certain deformation space to the outer wall peak 31 when a large external force applied from the outside impacts the outer wall peak 31, and then if the outer wall peak 31 cannot resist, the buffer block combines with the inner wall to provide certain buffering and force relief functions.

[0048] As Figure 4 shown, among them, the outer wall peak 31 has a first hollow area for placing the inner wall 20, and eight peak components for providing the outermost protection are formed around the periphery of the first hollow area, and the outer end surface of each peak component is a smooth end surface. The smooth end surface design means that there will be no concave part on the end surface (different from Figure 4 the existing protective sleeve provided), such as Figure 3The outer end surface 521 of the first upper connecting part 52 is a smooth end surface; then, the outer end surfaces of each peak component are used as the outermost layer of protection, so that no matter from which direction the external pressure is applied, the outer end surfaces of each peak component resist the external pressure in the corresponding area by contacting with a complete and larger surface area.

[0049] Among them, the eight peak components include a top peak part 51 for providing top surface protection, a bottom peak part 55 for providing bottom surface protection, a left peak part 53 for providing left side surface protection, a right peak part 57 for providing right side surface protection, a first upper connecting part 52 connected between the top peak part and the left peak part, a second upper connecting part 58 connected between the top peak part and the right peak part, a first lower connecting part 54 connected between the left peak part and the bottom peak part, and a second lower connecting part 56 connected between the right peak part and the bottom peak part; among them, the outer end surface 521 of the first upper connecting part 52 is a smooth end surface, the outer end surface 581 of the second upper connecting part 58 is a smooth end surface, the outer end surface 561 of the second lower connecting part 56 is a smooth end surface, and the outer end surface 541 of the first lower connecting part 54 is a smooth end surface; the outer end surface of the top peak part 51 is a smooth end surface, the outer end surface of the left peak part 53 is a smooth end surface, the outer end surface of the bottom peak part 55 is a smooth end surface, and the outer end surface of the right peak part 57 is a smooth end surface; that is, while ensuring that the outer side end surfaces of each peak component are smooth end surfaces, a complete closed outer end surface formed by sequentially connecting 8 smooth end surfaces, due to the absence of concave parts, the surface area formed for providing the outermost layer of protection is larger, so it can more effectively resist the external pressure in the corresponding area respectively.

[0050] Among them, the contour of the outer end surface 521 of the first upper connecting part 52 includes a straight line segment ( Figure 6 a 35 mm line segment in it) and two arc segments connected to both ends of the straight line segment (the contours of the second upper connecting part, the first lower connecting part, and the second lower connecting part are the same as that of the first upper connecting part 52, which will not be elaborated here); the contour of the outer end surface of the top peak part 51 is a straight line segment, and the contours of the outer end surfaces of the left peak part 53, the bottom peak part 55, and the right peak part 57 are also straight line segments, that is, a complete circle of line segments without inward bends can be formed, that is, there will be no obvious weak parts for the external force in this complete circle of contour. No matter from which direction the external force is applied, each contour part of this complete circle of contour formed can more effectively resist the external pressure in the corresponding area respectively.

[0051] Among them, the outer wall wave crest is a hollow octagonal prism, that is, the outer wall wave crest 31 can resist the pressure applied from all angles through a total of eight faces, realizing all-round protection for the outer wall wave trough 32, greatly enhancing the pressure resistance ability, and facilitating the use on the road in the driving environment. The radial cross-section of the outer wall wave crest 31 is octagonal, avoiding the phenomenon that one side bears the pressure in one direction. Through multi-sided sharing, the ring stiffness of the pipe is increased; each side represents the outer end face of each wave crest component, dividing 360 degrees into 8 regions, and each wave crest part in the corresponding region resists the external pressure, increasing the ring stiffness of the pipe.

[0052] Among them, the top wave crest part, the bottom wave crest part, the left wave crest part, the right wave crest part, the first upper connection part, the second upper connection part, the first lower connection part, and the second lower connection part are the same in shape and size; that is, it means that the external forces that the eight components in the outer wall wave crest can bear are the same, and there will be no phenomenon of a weaker anti-external force area. And when applied to cable buried underground, no matter how the protection sleeve turns, it can ensure the same resistance and the same ring stiffness.

[0053] Among them, the radial cross-section of the wave crest component can be square, that is, under the structural design that the radial cross-sections of the 8 wave crest components are all square, compared with the traditional circular radial cross-section, it is not easy to roll, tumble, or twist after being placed at the construction position during construction.

[0054] As Figure 3 shown, the outer wall wave crest 31 and the outer wall wave trough 32 are arranged at staggered intervals in the axial direction of the cable, that is, there is an outer wall wave trough 32 between two adjacent outer wall wave crests 31, and there is an outer wall wave crest 31 between two adjacent outer wall wave troughs 32; this design enables each section of the area covered by the outer wall on the inner wall 20 to have at least three layers of protection, that is, one layer is the outermost protection provided by the outer wall wave crest 31, and the at least two sub-outer layer protections are the sub-outer layer protections provided by the protection parts and the inner wave troughs in the outer wall wave trough 32.

[0055] That is, the outer wall 30 itself also has two layers of protection inside and outside to block large external force damage. Greatly improving the protection of the inner wall 30, that is, even if there are large external forces and pressures, only the two inner and outer layers of the outer wall 30 will be damaged first, and the inner wall will not be damaged, thus effectively protecting the cable in the pipe from being damaged.

[0056] Among them, the outer wall peak 31 and the outer wall valley 32 are respectively components of the outer wall, and the two can be integrally extruded. Integral extrusion is beneficial to improving the connection firmness and toughness between the two. When the outer wall peak 31 and the outer wall valley 32 are not damaged, the above-mentioned outer wall peak 31 and outer wall valley 32, combined with the inner wall 20, form at least four layers of protection, surrounding the outer circle of the cable to form layer upon layer of protection, greatly improving the resistance effect and ring stiffness, and thus being able to greatly improve the protection of the cable over a long period of time. In the actual use of the protective sleeve, only in the case of road surface collapse, temporary construction under the road, etc., there may be problems with the damage of the protective pipe; and when the outer wall peak is damaged due to super strong external force (such as a house collapse or a dump truck passing over the road surface), the remaining protective parts in the outer wall valley 32 and the inner valley form at least three protective walls in combination with the inner wall 30 for subsequent protection (there may be a phenomenon of untimely maintenance and repair).

[0057] In order to avoid the phenomenon that the external pressure directly damages the inner wall and the cable during a period of time after the outer wall peak 31 is damaged (without timely maintenance and replacement of the protective pipe); the protective part 33 on the outer surface of the outer wall valley 32 is the key. The protective part 33 can combine with the inner valley 35 and the inner wall 20 to temporarily form three layers of protection to provide temporary and effective protection for the cable in the above special situation, and the area where the outer wall peak 31 is damaged in the protective sleeve still has a certain ring stiffness during this period of time.

[0058] Among them, the inner wall 30, the inner valley 35, the protective part 33, and the outer wall peak 31 are distributed from the inside to the outside in the radial direction of the cable; therefore, during a period of time after the outer wall peak 31 is damaged, the protective part 33 can be used as the outermost layer of protection during this period of time to cope with external pressure and other situations. Based on the overall ring stiffness and toughness improvement brought by the protective part 13, it can protect the inner wall 30 and the cable. The shape of the protective part 13 can be annular, that is, it can cover the entire circle of the outer wall valley 32 to achieve the protection effect on multiple positions of the inner wall, and during this period of time, the protective part 13, the outer wall valley 32, and the inner wall 30 also form three protective walls to protect the cable.

[0059] In actual use, the length of the cable is adjusted according to the actual situation and the road section; therefore, in the second aspect of the present invention, a sleeve assembly is provided, including a plurality of buried high-compression and anti-external-force diamond-shaped cable protection composite sleeves to adapt to different cable lengths; the sleeve assembly can be a plurality of buried high-compression and anti-external-force diamond-shaped cable protection composite sleeves connected by snap connection (such as Figure 8 shown) or by hot melt connection (such as Figure 9 shown). In Figure 8When the multiple buried high-compression and external-force-resistant diamond-shaped cable protection composite sleeves 500 are connected in a snap-fastening manner, a rubber gasket 301 is sleeved between adjacent buried high-compression and external-force-resistant diamond-shaped cable protection composite sleeves to be connected. When the two protection composite sleeves are butted, a rubber gasket should be sleeved on both sides, and then they are clamped with a snap-fastening pipe fitting 300. Among them, the snap-fastening connection is simple and convenient, and can meet the construction under special conditions. And it can be constructed in stages, with half of the road under construction and half of it open to normal traffic; the construction can be carried out as soon as that night at the fastest. After the construction is completed, the sandy soil can be backfilled immediately, and the road can be opened to traffic the next day, with the lowest impact on road traffic. While for the hot-melt connection method, in Figure 9 , it is necessary to generate hot-melt welding points 305 at the splicing joints, and the requirements for the site are relatively high, requiring a relatively wide site. Generally, the pipe is 6 meters long. If two pipes are to be connected, there should be at least a distance of more than 12 meters. If multiple pipes are connected, the required length space is even longer. Among them, because it is an octagonal diamond shape, the pipes can be directly arranged side by side, and can be covered layer by layer up and down. Concrete encapsulation can be selectively carried out according to the specific construction environment and conditions, while reducing the total project cost. Among them, there is an easy problem of low connection firmness between adjacent outer wall wave peaks 31 in the spliced protection sleeve. To solve this technical problem, preferably, the protection member 33 completely covers the outer wall of the inner wave valley 35; that is, the protection member plays a role in improving the connection firmness of adjacent outer wall wave peaks 31 in this case.

[0060] As Figure 5 shown, it is a protection sleeve disclosed in an existing technology. The difference between this existing protection sleeve and the first embodiment is that: for the first upper connection part, the second upper connection part, the first lower connection part, and the second lower connection part of the eight wave peak components in the outer wall wave peak, the outer end faces of the above four connection parts are all concave inward towards the center of the sleeve. This structural design with an inward concave surface makes the concave part unable to provide the outermost layer of protection, and this inward concave design makes the surface area that each wave peak component can provide for the outermost layer of protection smaller, that is, the contact with a smaller surface area, obviously reducing the external-force resistance strength and also reducing the overall ring stiffness and overall strength of each wave peak component. From Figure 7 the perspective, the contour of the outer end face 521 of the first upper connection part 52 in the protection composite sleeve of the first embodiment includes a 35-mm straight line segment and two arc segments connected to both ends of the straight line segment (the same applies to the other connection parts 58, 56, 54); this smooth end face design and Figure 4The differences shown are relatively large, and a large surface contact can be formed to resist the external pressure in the corresponding area respectively. It should be noted that the 35-mm line segment corresponds to the length of one of the specifications of the present invention; it does not limit the length of the middle straight line in the contour of the outer end surface 521 of the first upper connection part 52; the present invention includes multiple specifications, such as DN50, DN100, DN150, DN175, DN250, etc. (i.e., DN50-250, where DN represents the inner wall diameter).

[0061] At the same time, it should be noted that during construction in special sites (such as subway construction sites), most of the pipes mentioned in the background art are circular. These circular pipes are laid in the soil and are relatively smooth, and the soil cannot hold them; when threading cables, the threading force will be relatively large, and it is easy to drag the pipes out. However, based on the overall shape being similar to an octagonal rhombus, that is, based on the radial cross-section of the wave crest component being square, the formed protective composite casing has a certain thickness and connection strength. Due to the square structure, it is not easy for the threading force to drag the pipes out of the soil encapsulation layer between the pipes and the pipes.

[0062] Figure 6 For Figure 5 the surveying and mapping data of this existing protective casing, from Figure 6 it can be seen that the ring stiffness measured for the above three specifications of protective casings (two of them are lower than the 80 kN / m measured in the second embodiment 2 ). It should be noted that the composite protective casing of the present application can, according to customer requirements, produce a ring stiffness of 100 kN / m 2 or even 150 kN / m 2 ring stiffness.

[0063] Second Embodiment

[0064] In this embodiment, the buried high-compression and anti-external-force rhombus-shaped cable protective composite casing is made of modified polypropylene as the main raw material, and the modified polypropylene includes the following raw materials in parts by weight:

[0065]

[0066] Among them, the modified calcium carbonate includes the following raw materials in parts by weight:

[0067] Light calcium carbonate 23-28 parts

[0068] Nano calcium carbonate 2-3 parts

[0069] Polypropylene grafted maleic anhydride 0.5-1.5 parts.

[0070] Among them, the toughening agent is polyolefin elastomer grafted with acrylic acid; the antioxidant is antioxidant 1010; the coupling agent is γ-aminopropyltriethoxysilane; the lubricant is pentaerythritol stearate.

[0071] Among them, the preparation steps of the modified calcium carbonate include:

[0072] Step S1, prepare modified calcium carbonate: Take the formulated amount of polypropylene grafted maleic anhydride and disperse it in pure water, then sequentially add the formulated amount of nano calcium carbonate and light calcium carbonate. After ultrasonic dispersion for 90 - 120 min, dry it in a vacuum oven at 50 - 60 °C for 2 - 3 h, and cool it to room temperature to obtain the modified calcium carbonate.

[0073] Step S2, prepare modified polypropylene: Mix the formulated amount of polypropylene resin, modified calcium carbonate, toughening agent, antioxidant, coupling agent and lubricant evenly, and then melt, extrude and pelletize it through a twin-screw extruder. Among them, the screw diameter is 68 mm, the length-diameter ratio is 25∶1, the screw speed is 120 r / min, and the extrusion temperature is 180 - 220 °C.

[0074] The modified polypropylene first uses polypropylene grafted maleic anhydride to perform surface modification on nano calcium carbonate and light calcium carbonate to obtain modified calcium carbonate, so as to promote the uniform dispersion of modified calcium carbonate in the polypropylene resin. Among them, the nano calcium carbonate and light calcium carbonate in the modified calcium carbonate can play a synergistic effect and effectively improve the strength and heat resistance of the polypropylene resin. Moreover, to adapt to the construction of the power cable protection sleeve at the turning point, the modified polypropylene uses polyolefin elastomer grafted with acrylic acid as the toughening agent, adds it to the polypropylene resin, and then cooperates with the coupling agent, antioxidant and lubricant to prepare modified polypropylene with excellent strength, toughness and heat resistance, so as to meet the construction and use requirements of the power cable protection sleeve in high-pressure driving sections and turning channels. It should be particularly noted that for the existing coated steel pipes mentioned in the background technology, if the glue joint breaks, it is easy to rust; and for the existing glass steel pipes (such as BWFRP pipes), when encountering moisture, chemical reactions will occur, and they are easy to delaminate and fall off. However, the protective composite sleeve made of the modified polypropylene in the second embodiment can be constructed in various acid-base-salt environments without damage. Moreover, compared with other existing pipes on the market, such as coated steel pipes, glass steel pipes, BWFRP pipes, etc., the above existing pipes are polluting to the environment during the production process, while our pipe is made of the above-mentioned selected main raw materials and will not pollute the environment during the production process, and has environmental protection.

[0075] Comparative Example 1

[0076] The difference between the power cable protection sleeve of this Comparative Example 1 and the third embodiment is 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.

[0077] Comparative Example 2

[0078] The difference between the power cable protection sleeve in this Comparative Example 2 and the third embodiment is that the polyolefin elastomer grafted acrylic acid, which is the raw material of the modified polypropylene in the third embodiment, is replaced by cis-butadiene rubber.

[0079] Performance test: Performance tests were carried out on the power cable protection sleeves of the third embodiment and Comparative Examples 1-2, and the test results are shown in Tables 1-2 below; among them, the size specifications of the power cable protection sleeves used in the test are as follows: nominal inner diameter is 200mm, minimum average inner wall thickness is 1.8mm, minimum outer shape side length is 242mm, and maximum outer shape side length is 246mm.

[0080] Table 1

[0081]

[0082]

[0083] Table 2

[0084] Comparative Example 1 Comparative Example 2 Second Embodiment Ring Stiffness (23 + 2)°C 60 kN / m 65 kN / m 80 kN / m Bending Radius 12D 16D 18D

[0085] As can be seen from Tables 1-2, the buried high-compression and anti-external-force diamond-shaped cable protection composite sleeve of the second embodiment has high ring stiffness, good pressure resistance, and it also has an excellent bending radius, which can reach at least 15D, has good toughness, can be bent into a row of pipes, adapts to ground settlement or changes in the construction foundation, and ensures the normal protection of the cable by the pipe. It can meet the construction and use requirements of cable protection composite sleeves in high-pressure and heavy-traffic sections and turning channels.

[0086] For the buried high-compression and anti-external-force diamond-shaped cable protection composite sleeve of the present invention, the product characteristics and beneficial effects are as follows:

[0087] 1. New design: The combination of the outer wall wave crest (overall similar to an octagonal diamond shape) and the circular inner wave valley reduces the cable-pulling resistance and enhances the compressive performance;

[0088] 2. High strength: The unique external structure and the composite environmentally friendly modified polypropylene material make it have a relatively high ring stiffness, which can reach a minimum of 50 kN / m 2

[0089] 3. High heat resistance: Using special modified polypropylene raw materials, the heat resistance temperature is high, and the heat resistance temperature ≥ 136 °C.

[0090] ​4. Corrosion resistance: Composite polypropylene has the advantages of corrosion resistance, acid and alkali resistance, and its service life can reach more than 50 years.

[0091] 5. Low-temperature resistance: The pipe has good low-temperature impact resistance. When it is accidentally impacted at a lower temperature, it has better impact resistance.

[0092] 6. Strong toughness: It has good toughness and can be bent into a row of pipes to adapt to ground settlement or changes in the construction site. The minimum bending radius is 15DN, ensuring the normal protection of the pipe for the cable.

[0093] 7. The outer shape is an octagonal rhombus. When installing and constructing, pipe pillows do not need to be used for fixation, which greatly reduces the workload and saves pipe pillows at the same time; the connection between pipes adopts snap-on or hot-melt type. According to the construction site environment, it can be selected whether to use concrete encapsulation. When choosing not to use concrete encapsulation, it can save concrete costs, construction labor costs, time costs, etc., and can reduce the total project cost.

[0094] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance, which is used for burying cables. It is characterized in that It includes an inner wall for placing cables and providing the innermost protection for the cables, and an outer wall located on the outer circle of the inner wall; the outer wall includes outer wall valleys and outer wall peaks providing the outermost protection, the outer wall valleys include inner valleys providing a secondary outermost protection and protective members provided on the outer surface of the inner valleys for providing the secondary outermost protection; the protective members are annular ribs, the annular ribs are laid around the outer surface of the inner valleys, and at least two of the annular ribs are stacked layer by layer and sleeved on the outer circle of the inner valleys; a buffer block is filled in the inner cavity formed between the inner wall and the inner wall of the outer wall peaks, and a buffer space is formed between the buffer block and the inner wall of the outer wall peaks after filling. The outer wall peaks have a first hollow area for placing the inner wall, and eight peak components for providing the outermost protection are formed on the periphery of the first hollow area; the radial cross-section of the peak components is square.

2. The buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance according to claim 1, wherein, The radial cross-section of the inner valley is annular, and the protective member covers at least a section of the annular outer circle.

3. The buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance according to claim 1, characterized in that, The protective member is a strip-shaped rib, and the strip-shaped rib is connected between two adjacent outer wall valleys.

4. The buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance as claimed in claim 1, wherein The protective composite sleeve is made of modified polypropylene as the main raw material, and the modified polypropylene includes the following raw materials in parts by weight: 65 - 70 parts of polypropylene resin 5 - 9 parts of modified calcium carbonate 4 - 6 parts of toughening agent 0.1 - 0.3 parts of antioxidant 0.1 - 0.2 parts of coupling agent 0.2 - 0.5 parts of lubricant 0.5 - 1 part of colorant Among them, the modified calcium carbonate includes the following raw materials in parts by weight: 23 - 28 parts of light calcium carbonate 2 - 3 parts of nano calcium carbonate 0.5 - 1.5 parts of polypropylene grafted maleic anhydride.

5. The buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance according to claim 4, characterized in that, The toughening agent is polyolefin elastomer grafted with acrylic acid.

6. The buried diamond-shaped cable protection composite sleeve with high compressive resistance and external force resistance according to claim 1, characterized in that The inner wall, inner valley, protective member and outer wall peak are distributed from the inside to the outside in the axial direction of the cable.

7. A sleeve assembly, comprising a plurality of the buried high-compression and anti-external-force diamond-shaped cable protection composite sleeves as described in any one of claims 1 - 6, and the plurality of buried high-compression and anti-external-force diamond-shaped cable protection composite sleeves are connected by snap connection or by hot melting connection.

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