Photoelectric composite cable and composite pipe synchronously laid in pipeline

Abstract

The utility model discloses a photoelectric composite cable and a composite pipe used for being synchronously laid in a pipeline, the photoelectric composite cable comprises a first sheath pipe and a second sheath pipe which are externally connected and adjacently fixed, an optical fiber is arranged in the first sheath pipe, a conductor is arranged in the second sheath pipe, and the first sheath pipe and the second sheath pipe are fixedly connected. The joint of the first protective sleeve and the second protective sleeve can be torn to separate the first protective sleeve from the second protective sleeve; the wall thickness of the first sheath tube and the wall thickness of the second sheath tube are 0.1 mm to 1.5 mm; the outer diameter of the first sheath tube is smaller than that of the second sheath tube, and the maximum outer diameter of the photoelectric composite cable is 4-12 mm. The photoelectric composite cable can be laid in the pipeline, so that the photoelectric composite cable does not need to be suspended in a self-supporting manner, the design of the photoelectric composite cable is simplified, the thinner optical cable part is connected with the thicker cable part, and necessary tensile performance can be provided for the optical cable through the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber cable, and particularly relates to an optical fiber cable and a composite pipe. BACKGROUND

[0002] During building construction, a pipe is usually reserved in the building for future wiring. The pipe with an inner diameter of 6mm-13mm accounts for the highest proportion in the actual market. When the wiring construction is actually carried out, a network cable or an optical cable is laid in the pipe according to actual needs.

[0003] In the prior art, since the size of the pipe is relatively small, and the size of the optical fiber cable meeting the performance requirements on the market is much larger than the inner diameter of the pipe, the common practice during actual wiring is to pass a network cable or an optical cable through a pipe. Therefore, in order to complete the wiring in the building, a pipe needs to be configured for each network cable and optical cable, which causes low utilization of the pipe, repeated laying construction, and waste of manpower and resources. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides an optical fiber cable for synchronous laying in a pipe and a composite pipe, which are used to solve the technical problem that the existing optical fiber cable cannot be adapted to the market 6mm-13mm thin pipe to realize synchronous laying.

[0005] The present application provides an optical fiber cable for synchronous laying in a pipe, which comprises a first sheath pipe and a second sheath pipe which are fixedly connected to each other, an optical fiber is arranged in the first sheath pipe, and a conductor is arranged in the second sheath pipe, and the first sheath pipe and the second sheath pipe can be separated by tearing and pulling at the connection position of the first sheath pipe and the second sheath pipe.

[0006] The wall thickness of the first sheath pipe and the second sheath pipe is 0.1mm-1.5mm.

[0007] The outer diameter of the first sheath pipe is smaller than that of the second sheath pipe, and the maximum outer diameter of the optical fiber cable is 4mm-12mm.

[0008] Further, the outer diameter of the first sheath pipe is 1mm-4mm, and the outer diameter of the second sheath pipe is 5mm-10mm.

[0009] Further, the optical fiber is a tight-packaged optical fiber or a semi-tight-packaged optical fiber, and the breaking elongation of the tight-packaged material is greater than or equal to 100%.

[0010] Further, the thickness of the connection position of the first sheath pipe and the second sheath pipe is 0.1mm-1.45mm, which is smaller than that of the first sheath pipe and the second sheath pipe.

[0011] Further, the number of optical fibers is 1-4 cores.

[0012] Further, the conductor is a solid copper wire or a multi-stranded twisted copper wire, and the internal stress of the conductor is less than or equal to a first preset value.

[0013] Further, the first sheath pipe is further provided with reinforcing yarns, and there is no other reinforcing member inside and outside the first sheath pipe.

[0014] Further, the optical fiber composite cable has a torsion angle of less than or equal to 0.2° per 10 m.

[0015] In a second aspect of the present application, an optical fiber composite pipe is provided, comprising the optical fiber composite cable of the first aspect of the present application and a pipe, the optical fiber composite cable being laid in the pipe, the inner diameter D1 of the pipe being between 6 mm and 13 mm, and the maximum outer diameter D2 of the optical fiber composite cable satisfying D2+0.1≤D1.

[0016] Advantages

[0017] The optical fiber composite cable for synchronous laying in a pipe according to the present application provides an optical fiber composite cable with a thin wall thickness and a small overall size, so that a thin pipe with a diameter of 6-13 mm on the market can be simultaneously provided with an optical cable and an electrical cable at one time, saving the amount of pipe and laying time, and widening the use occasions of such pipes and improving the utilization rate of the pipes.

[0018] The optical fiber composite cable described above does not need to be self-supporting overhead, so the design of the optical fiber composite cable is simplified, and the thinner optical cable part can provide the necessary tensile performance for the optical cable through connection with the thicker electrical cable part, so the corresponding design for achieving the tensile performance of the optical cable part can be simplified, thereby ensuring that the optical fiber composite cable according to the present application still meets the tensile performance requirements in the case of small size. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0020] Figure 1 is a cross-sectional view of an optical fiber composite cable according to an embodiment of the present application.

[0021] Figure 2 is a cross-sectional view of a second optical fiber composite cable according to an embodiment of the present application.

[0022] Figure 3 is a cross-sectional view of a third optical fiber composite cable according to an embodiment of the present application.

[0023] Figure 4 Fig. 4 is a cross-sectional view of a fourth optical fiber cable according to an embodiment of the present application.

[0024] Figure 5 Fig. 5 is a cross-sectional view of the fourth optical fiber cable according to an embodiment of the present application when twisted.

[0025] Figure 6 Fig. 6 is a longitudinal cross-sectional view of the fourth optical fiber cable according to an embodiment of the present application in a pipe.

[0026] Figure 7 Fig. 7 is a cross-sectional view of the fourth optical fiber cable according to an embodiment of the present application in a pipe.

[0027] In the drawings, the following reference numerals are used:

[0028] First sheath tube 1, reinforcing yarn 2, joint 3, optical fiber 4, conductor 5, insulation layer 6, second sheath tube 7, isolation skeleton 8, pipe 9. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In the description of the present application, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0032] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] This embodiment provides a fiber optic composite cable that can be installed in a small-diameter conduit 9. The conduit 9 is a common type of conduit used in engineering, typically with an inner diameter of 6mm-13mm, and is pre-embedded in the building walls during construction. During subsequent cable laying, the pre-embedded conduit 9 is used for cable installation. Each conduit 9 is usually used to install a single cable, such as a high-voltage cable, a low-voltage cable, or a fiber optic cable.

[0034] like Figure 1 The diagram shown is a cross-sectional schematic of an optical fiber composite cable for synchronous laying in a pipe, provided by an embodiment of the present invention. The optical fiber composite cable of this embodiment can achieve a cross-sectional dimension smaller than the pipe 9 at the maximum outer diameter, so the optical fiber composite cable can be laid in the pipe 9 in one go.

[0035] Depend on Figure 1 It is known that the optoelectronic composite cable includes an optical cable part and an electrical cable part, that is, it is provided with an externally connected and fixed first sheath tube 1 and a second sheath tube 7. The first sheath tube 1 contains an optical fiber 4 to form the optical cable part, and the second sheath tube 7 contains a conductor 5 to form the electrical cable part. The first sheath tube 1 can protect the optical fiber 4 therein, and the second sheath tube 7 can protect the conductor 5 therein.

[0036] Because optical fiber 4 is thinner, while conductor 5 is generally made of copper wire, which is thicker than optical fiber 4, the outer diameter of the first sheath tube 1 is smaller than the outer diameter of the second sheath tube 7. Therefore, the maximum outer diameter of the optical-electric composite cable is 4.0mm-12mm, thus adapting to current 6mm-13mm conduit resources. In some specific embodiments, the outer diameter of the first sheath tube 1 is 1mm-4mm, and the outer diameter of the second sheath tube 7 is 5mm-10mm, which can be determined according to the required cable specifications.

[0037] To ensure the protection of the first sheath tube 1 and the second sheath tube 7, the thickness of the first sheath tube 1 and the second sheath tube 7 should be sufficient. Since the pipe 9 can be laid through the pipe 9 in the present embodiment, the pipe 9 itself provides certain support and protection to the optical fiber composite cable, and thus the tensile strength requirement for the optical fiber composite cable, especially the more fragile optical fiber part, is lower. Therefore, the thickness requirement for the first sheath tube 1 and the second sheath tube 7 does not need to be too large, and additional strengthening structures such as tensile rods do not need to be provided. The wall thickness of the first sheath tube 1 and the second sheath tube 7 is 0.1mm-1.5mm in the present embodiment, and the wall thickness of the first sheath tube 1 is smaller than that of the second sheath tube 7. Generally, the wall thickness of the first sheath tube 1 is 0.3mm-0.5mm, and the wall thickness of the second sheath tube 7 is 0.5mm-1mm. The specific thickness can be determined by comprehensively considering the required strength of the optical fiber composite cable and the diameter of the pipe 9, to ensure that the first sheath tube 1 and the second sheath tube 7 can balance the protection, tensile strength and overall size control within the range.

[0038] The cross-sectional profile of the optical fiber composite cable is determined by the shape, number and connection relationship of the first sheath tube 1 and the second sheath tube 7. Common cross-sectional shapes of the first sheath tube 1 and the second sheath tube 7 include both circular rings, one circular ring and one polygonal ring, and two polygonal rings, wherein polygonal refers to three or more sides.

[0039] In some preferred embodiments, as shown in Figure 1 the cross-sectional shapes of the first sheath tube 1 and the second sheath tube 7 are both circular rings and both are 1, and the contact surface between the entire optical fiber composite cable and the pipe 9 during pipe laying is an arc surface, which is beneficial to generate less friction and not easy to produce stress concentration during laying, thereby facilitating laying and preventing damage to the optical fiber composite cable.

[0040] In addition to the cross-sectional form as shown in Figure 1 , Figures 2 to 4 three other typical embodiments of the cross-sectional profile of the optical fiber composite cable are also shown. Figure 2 An optical fiber composite cable with one first sheath tube 1 having an elliptical ring cross-section and one second sheath tube 7 having a circular ring cross-section is shown. Figure 3 An optical fiber composite cable with two first sheath tubes 1 and one second sheath tube 7 is shown, wherein the two first sheath tubes 1 are arranged adjacent to each other outside the second sheath tube 7, and the cross-sections of the first sheath tube 1 and the second sheath tube 7 are both circular rings. Figure 4 An optical fiber composite cable with one first sheath tube 1 having a three-sided ring cross-section and one second sheath tube 7 having a circular ring cross-section is shown.

[0041] It should be noted that the above-described embodiments with different outlines are merely illustrative and do not exhaustively describe all possible embodiments that satisfy the concept of this application. For ease of explanation, unless otherwise specified, the embodiments of the present invention are mainly based on... Figure 1 The cross-sectional style shown is explained below; the corresponding parts of the other embodiments can be referred to. Figure 1 The introduction will be implemented accordingly.

[0042] The connection between the first sheath tube 1 and the second sheath tube 7 should meet the following requirements: the first sheath tube 1 and the second sheath tube 7 should remain connected when separation is not required, and separation of the first sheath tube 1 and the second sheath tube 7 should be easily achieved when separation is required. Furthermore, since the outer diameter of the optoelectronic composite cable needs to be as small as possible, the connection point 3 should be as short and thin as possible while maintaining the connection between the first sheath tube 1 and the second sheath tube 7. That is, the connection point 3 should be shorter in the direction connecting the first sheath tube 1 and the second sheath tube 7 and thinner perpendicular to that direction. A short, thin wall exists between the two thicker walls, allowing for easy separation when separation is required. By using the first sheath tube 1 and the second sheath tube 7 as the point of force application and shearing along the extension direction of the short, thin wall, the separation of the first sheath tube 1 and the second sheath tube 7 is achieved.

[0043] Therefore, in some preferred embodiments, the thickness of the connection 3, i.e., in the direction perpendicular to the first sheath 1 and the second sheath 7, is set such that the dimension of the connection 3 is 0.1mm-1.45mm smaller than the smaller wall thickness of the first sheath 1 and the second sheath 7, and the length of the connection 3 is such that the dimension in the direction connecting the first sheath 1 and the second sheath 7 is less than 0.1mm. For example, if the wall thickness of the first sheath 1 is 0.3mm and the wall thickness of the second sheath 7 is 0.6mm, the thickness of the connection 3 is 0.2mm smaller than the wall thickness of the first sheath 1, i.e., 0.1mm, and the length of the connection 3 is 0.05mm. (See attached figure.) Figure 1 As shown, the connection 3 is located between the first sheath tube 1 and the second sheath tube 7, and its size is extremely small, so it is not shown in the figure. This makes the cross-section of the entire optoelectronic composite cable approximately a figure-eight shape with one end larger than the other.

[0044] In some preferred embodiments, the first sheath 1, the second sheath 7, and the connection 3 are made of flame-retardant materials such as LSZH (low smoke halogen-free cable) or PVC.

[0045] In some preferred embodiments, the optical fiber 4 is a tight-buffered fiber or a semi-tight-buffered fiber, and the tight-buffered material has a breaking elongation greater than or equal to 100%. Thus, by using tight-buffered or semi-tight-buffered fibers, the size of the optical cable portion is minimized. In some specific embodiments, tight-buffered fibers are selected, and the outer diameter of the tight-buffered fiber is controlled between 0.4mm and 0.9mm, which can be determined based on the inner diameter of the conduit 9. The material of the tight-buffered layer surrounding the optical fiber 4 is preferably a thermoplastic material such as LSZH, PVC, PA, TPU, or TPEE, and the tight-buffered material can be stripped at a time with Miller pliers at a depth of more than 3cm without damaging the optical fiber.

[0046] In some preferred embodiments, the number of optical fibers 4 is 1-4 cores. Optical fibers 4 are preferably G657 with excellent bending performance to accommodate bending installations with smaller diameters indoors.

[0047] like Figure 1 In the illustrated embodiment, a reinforcing yarn 2 is also provided on the outside of the optical fiber 4 to enhance the tensile strength of the optical cable. The reinforcing yarn 2 can be made of tensile-resistant yarn materials such as aramid, glass fiber, or polyester. In this embodiment, the strength of the optical cable part depends partly on the reinforcing yarn 2 and partly on the cable part. Therefore, apart from the reinforcing yarn 2, there are no other reinforcing components inside or outside the first sheath tube 1.

[0048] In some preferred embodiments, the conductor 5 is a solid copper wire or a multi-strand stranded copper wire. To prevent a significant change in the final relative position of the optical cable and electrical cable sections along the length of the cable due to the twisting of the conductor 5, the internal stress of the conductor 5 is less than or equal to a first preset value. Figure 1 In the illustrated embodiment, the conductor 5 is constructed using four pairs of twisted copper wires. Each pair of twisted copper wires includes two copper wires and a corresponding insulation layer 6, forming four conductors 5 with an outer diameter of 22AWG-26AWG. In this embodiment, an isolation frame 8 is also provided inside the first sheath to separate the four pairs of twisted wires to optimize transmission performance. In some embodiments, if the transmission performance requirement is met even without the isolation frame 8, the isolation frame 8 can be removed, thus reducing the size of the conductor 5 portion.

[0049] An embodiment of the present invention also provides a method for processing an optoelectronic composite cable, the method comprising the following steps:

[0050] Step S101: Using an extrusion device, wrap the first sheath tube 1 and the second sheath tube 7 around the outermost parts of the optical fiber 4 and the conductor 5 respectively, and fix the first sheath tube 1 and the second sheath tube 7 externally adjacent to each other to obtain a primary optical fiber composite cable.

[0051] Step S102, the primary optical fiber cable is sequentially subjected to at least first vacuum cooling forming and second vacuum cooling forming, the temperature of the first vacuum cooling forming is T1, the temperature of the second vacuum cooling forming is T2, and T1 is greater than T2.

[0052] The above processing method passes the components inside the first sheath pipe 1 and the second sheath pipe 7 through the extrusion equipment according to the designed position, the extrusion equipment melts the materials of the first sheath pipe 1 and the second sheath pipe 7 through high temperature of about 200 DEG C, and forms the shape of the first sheath pipe 1 and the second sheath pipe 7 through a mold to wrap the corresponding components, and the first sheath pipe 1 and the second sheath pipe 7 are adjacent. Figure 1 The optical fiber cable shown in the figure, that is, the optical fiber 4 and the reinforcing yarn 2 are wrapped into the first sheath pipe 1 through the extrusion equipment, the copper wire, the insulating layer 6 and the isolation skeleton 8 are wrapped into the second sheath pipe 7, and the first sheath pipe 1 and the second sheath pipe 7 form a connection similar to an 8-shaped connection.

[0053] The temperature of the first sheath pipe 1 and the second sheath pipe 7 of the primary optical fiber cable just made from the extrusion equipment is high and soft, at this time, the first sheath pipe 1 and the second sheath pipe 7 and the components inside them have not yet completed the final tight wrapping and setting, at this time, by two-stage vacuum cooling forming, that is, passing the primary optical fiber cable through the vacuum forming equipment for step-by-step cooling, the first sheath pipe 1 and the second sheath pipe 7 can slowly shrink, shrink uniformly, ensure the roundness of the optical fiber cable, and be beneficial to the final forming of the first sheath pipe 1 and the second sheath pipe 7, so that the inner and outer diameters of the final product of the optical fiber cable are uniform.

[0054] In some preferred embodiments, T1 is 75 DEG C-55 DEG C, T2 is 50 DEG C-30 DEG C, and the temperature difference between T1 and T2 is 15 DEG C-30 DEG C.

[0055] Strict size and shape control is extremely important for the optical fiber cable of the embodiment.

[0056] On the one hand, for the optical fiber cable inside, the first sheath pipe 1 and the internal optical fiber 4 are uniformly wrapped, and the uniform and flat surface is not easy to cause excessive extrusion of the optical fiber 4 in some positions and cause damage to the optical fiber 4 and increase the attenuation. The second sheath pipe 7 and the conductor 5 inside are uniformly wrapped, which is beneficial to reduce the stress of the conductor 5, ensure the transmission performance, and make the cable of the conductor 5 part keep stable pitch. The stress of the conductor 5 mainly comes from Figure 1The multi-stranded twisted copper wire in the embodiment shown, if the stress is not removed, can cause the relative position of the first sheath tube 1 and the second sheath tube 7 of the optical fiber composite cable to change in the length direction of the optical fiber composite cable during the extrusion molding, that is, the optical fiber composite cable appears to be twisted. Since the optical fiber composite cable needs to be finally laid in the pipe 9, if the optical fiber composite cable appears to be significantly twisted, the relative position relationship between the optical fiber composite cable and the pipe 9 can change at different cross-sectional positions during the pipe laying, which is not conducive to the pipe laying and can easily cause abrasion to the optical cable at some positions when the optical cable is in close contact with the pipe 9.

[0057] In another aspect, since the optical fiber composite cable needs to be laid in the pipe 9, and the inner diameter of the pipe 9 and the overall outer diameter of the optical fiber composite cable are both small, the gap therebetween is also small. For example, the inner diameter of the pipe 9 is 13 mm, the maximum outer diameter of the optical fiber composite cable that can be laid is 12 mm, and the gap therebetween is only 1 mm. If the outer diameter of the optical fiber composite cable is not well controlled, especially if the outer diameter is too large, the friction during the pipe laying will be large or even the optical fiber composite cable cannot pass through. In addition, poor outer diameter or significant twisting of the optical fiber composite cable can also cause the optical cable to be severely squeezed between the optical cable and the inner wall of the pipe 9, resulting in damage to the optical cable.

[0058] Therefore, based on the above reasons, in some preferred embodiments, before the first sheath tube 1 and the second sheath tube 7 are respectively wrapped around the optical fiber 4 and the conductor 5 by the extrusion equipment, the method comprises:

[0059] Step S100, the conductor 5 is twisted according to a first untwisting parameter to reduce the internal stress of the conductor 5. The above-mentioned first untwisting parameter is provided by the untwisting device. After the untwisting device untwists the conductor 5 at the first untwisting parameter before the conductor 5 enters the extrusion equipment to reduce the internal stress of the conductor 5 as much as possible, the optical fiber composite cable thus formed is less likely to twist.

[0060] Whether the untwisting of the above-mentioned conductor 5 is appropriate needs to be judged after the optical fiber composite cable is formed, so as to feedback adjust whether the untwisting parameter setting is appropriate according to the result after the formation.

[0061] In some preferred embodiments, after the primary optical fiber composite cable is sequentially subjected to at least the first vacuum cooling molding and the second vacuum cooling molding, the method comprises:

[0062] Step S103, the optical fiber composite cable is straightened and sequentially passes through a marking device to obtain a plurality of first marks on the surface of the optical fiber composite cable.

[0063] Step S104, if the change of the relative position of the several first marks along the length direction of the optical-electric composite cable to the first sheath pipe 1 and the second sheath pipe 7 is greater than a second preset value, the first twist-off parameter is adjusted to a second twist-off parameter until the change of the relative position is less than or equal to the second preset value.

[0064] By the above method, the optical-electric composite cable is processed through the marking device, and because the marking position of the marking device is fixed, theoretically, a uniform relative position relationship between the plurality of marks along the length direction of the optical-electric composite cable and the optical-electric composite cable should be formed. However, once the optical-electric composite cable is twisted, the relative position between the cable part and the conductor 5 part will change in different length direction cross sections. For example, if the twist direction is right-handed or left-handed, the cable part is located directly above the cable part in a certain cross section, and along the length direction, the position of the cable part will gradually change in the clockwise or counterclockwise direction around the cable. Generally, the greater the stress of the conductor 5, the greater the degree of twisting, and the more obvious the change in the relative position relationship between the cable part and the cable part. Therefore, by the above relative position change and the size of the change between the first mark and the first sheath pipe 1 and the second sheath pipe 7, whether the first sheath pipe 1 and the second sheath pipe 7 have a relative position change in different cross sections can be reflected. For example, in a certain cross section, the first mark is located on the second sheath pipe 7 and is located in the clockwise direction relative to the first sheath pipe 1, and in another cross section, the first mark is located on the first sheath pipe 1. Therefore, the position of the first mark has obviously changed, and the first twist-off parameter can be adjusted until the first mark uniformly and stably appears on the optical-electric composite pipe, so that it is considered that the twisting of the optical-electric composite cable is controlled within a reasonable range.

[0065] The same as the above method, the present application also provides other embodiments to solve the problem of reflecting the twisting of the above optical-electric composite cable. In these preferred embodiments, after the primary optical-electric composite cable is sequentially subjected to at least first vacuum cooling forming and second vacuum cooling forming, the method comprises:

[0066] Step S105, the optical-electric composite cable is straightened to obtain the first sheath pipe 1 center position A1, the second sheath pipe 7 center position B1 at the first cross section position of the optical-electric composite cable, and the first sheath pipe 1 center position A2, the second sheath pipe 7 center position B2 at the second cross section position.

[0067] Step S105, the optical-electric composite cable is straightened to obtain the first sheath pipe 1 center position A1, the second sheath pipe 7 center position B1 at the first cross section position of the optical-electric composite cable, and the first sheath pipe 1 center position A2, the second sheath pipe 7 center position B2 at the second cross section position.

[0068] Step S106: Calculate the angle θ between the center line A1B1 and the center line A2B2. If the rate of change of the angle θ in the length direction of the optoelectronic composite cable is greater than a third preset value, adjust the first untwisting parameter to the second untwisting parameter until the change in the relative position is less than or equal to the third preset value.

[0069] like Figure 5 As shown, in one embodiment, after taking two different cross-sections 10m apart on the optical fiber composite cable and overlapping them, it can be seen that B1 and B2 are at the same position, while A1 and A2 are at different positions. The angle θ between the center line A1B1 and the center line A2B2 is 90°. However, in this embodiment, it is necessary to control the angle θ to be less than or equal to 0.2° on the two cross-sections 10m apart. That is, the third preset value is that the aforementioned angle θ is less than or equal to 0.2° for every 10m of the optical fiber composite cable. Therefore, the actual angle θ in this embodiment is 90°, which significantly exceeds the third preset value. The first un-twist parameter should be adjusted until the angle θ is measured again and is less than the third preset value.

[0070] To ensure successful installation through conduit and protect the fiber optic cable section, such as Figure 6 and Figure 7 As shown, embodiments of this application also provide a construction method for the optoelectronic composite cable in the above embodiments of this application or the optoelectronic composite cable obtained by the processing method embodiments of this application, wherein the optoelectronic composite cable is threaded through a pipe with an inner diameter of 6mm-13mm for use.

[0071] Furthermore, the method includes the following steps:

[0072] Step S201: Select the maximum outer diameter D2 of the optical fiber composite cable according to the inner diameter D1 of the pipe 9 to be installed, satisfying D2+0.1≤D1.

[0073] Step S202: Insert the optoelectronic composite cable into the pipe 9 with the second sheath tube 7 tightly attached to the inner wall of the pipe 9 and the first sheath tube 1 far away from the inner wall of the pipe 9.

[0074] In some preferred embodiments, when the optoelectronic composite cable is threaded through a conduit, the position where the second sheath 7 is close to the inner wall of the conduit 9 is near the area where the center line connecting the first sheath 1 and the second sheath 7 intersects with the cross section of the conduit 9 on one side of the second sheath 7.

[0075] like Figure 6As shown, the outer wall of the second sheath pipe 7 is in close contact with the inner wall of the pipeline 9, and the first sheath pipe 1 is located on the opposite side of the close contact between the second sheath pipe 7 and the pipeline 9, so that the first sheath pipe 1 can be kept away from the pipeline 9, thereby reducing the possibility of the fragile optical cable part contacting the pipeline 9 and the possibility of damage to the optical cable during the pipe-laying process.

[0076] In order to achieve the pipe-laying in the manner described in the above embodiments, in some preferred embodiments, the pipe-laying of the fiber-optical composite cable into the pipeline 9 in the manner that the second sheath pipe 7 is in close contact with the inner wall of the pipeline 9 and the first sheath pipe 1 is kept away from the inner wall of the pipeline 9, comprises:

[0077] Step S2021, an elongated flexible wire is configured as a guide, the length of the guide before the free end of the fiber-optical composite cable is greater than the length of the pipeline 9, and one end of the guide is fixed to the free end of the fiber-optical composite cable. The guide is used to provide a pulling force from the outlet side of the pipeline 9 to enable the fiber-optical composite cable to move from the inlet side to the outlet side of the pipeline 9 under the action of the pulling force during the pipe-laying.

[0078] Step S2022, the free end of the guide is inserted into the first end of the pipeline 9 and pulled out from the second end of the pipeline 9. The first end is the inlet side of the pipeline 9, and the second end is the outlet side of the pipeline 9. At this time, the fiber-optical composite cable is still outside the pipeline 9 without pulling the guide.

[0079] Step S2023, a first area on the pipeline 9 is determined as a close contact area between the pipeline 9 and the fiber-optical composite cable during the pipe-laying. The first area is determined at the inlet side of the pipeline 9 before formally pulling the guide, thereby providing a guide for the pulling direction of the guide. Under the action of the correct pulling direction, the fiber-optical composite cable can be ensured to be laid in the manner as shown in Figure 6 and Figure 7 .

[0080] Step S2024, according to the first area corresponding to a first orientation on the second end of the pipeline 9, the pulling direction of the guide is determined as between the first orientation and the outlet direction along the second end of the pipeline 9.

[0081] Step S2025, the guide is pulled in the pulling direction until the fiber-optical composite cable is pulled from the first end to the second end of the pipeline 9.

[0082] Since the pipe 9 is long, a first orientation of a first region determined at an inlet side of the pipe 9 is found along the pipe 9 when the first region theoretically extends to an outlet side of the pipe 9, and a force direction includes a pulling force F2 along a first end to a second end of the pipe 9 and a pressure F1 along the first orientation, so that the optical fiber cable can be threaded into the pipe 9 in a manner shown in Figure 6 and Figure 7

[0083] In some preferred embodiments, the first orientation of the first region at the second end of the pipe 9 includes:

[0084] According to a marked position outside the pipe 9, a relative position relationship between the first region and the marked position is determined, and the first orientation is determined at the second end of the pipe 9 according to the relative position relationship.

[0085] In some preferred embodiments, an included angle between the force direction and an outlet direction of the second end of the pipe 9 is 10°-60°.

[0086] Through the construction method provided by the above embodiments, the optical cable can be ensured not to be subjected to external pressure during construction, and normal attenuation is ensured.

[0087] The embodiment also provides an optical fiber cable, which includes the optical fiber cable provided by the above embodiments and a pipe, the optical fiber cable is laid in the pipe, an inner diameter D1 of the pipe is between 6mm and 13mm, and a maximum outer diameter D2 of the optical fiber cable satisfies D2+0.1≤D1.

[0088] The optical fiber cable with the pipe can realize the laying of the cable during the construction of the building by reserving excess optical fiber cable at both ends of the pipe, and saves the process.

[0089] The above is only an embodiment of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.​

Claims

1. A fiber optic composite cable for synchronous laying in a pipeline, characterized in that, The first sheath pipe and the second sheath pipe are connected, and the first sheath pipe and the second sheath pipe can be separated by tearing and pulling; The wall thickness of the first sheath pipe and the second sheath pipe is 0.1mm-1.5mm; The outer diameter of the first sheath pipe is smaller than the outer diameter of the second sheath pipe, and the maximum outer diameter of the optical fiber composite cable is 4mm-12mm.

2. The optical-electrical composite cable according to claim 1, characterized in that, The outer diameter of the first sheath pipe is 1mm-4mm, and the outer diameter of the second sheath pipe is 5mm-10mm.

3. The optical-electrical composite cable according to claim 1, wherein, The optical fiber is tight-packaged or semi-tight-packaged, and the breaking elongation of the tight-packaging material is greater than or equal to 100%.

4. The fiber optic ribbon of claim 1, wherein the at least one optical fiber is a single fiber. The thickness of the connection between the first sheath pipe and the second sheath pipe is 0.1mm-1.45mm, which is smaller than the wall thickness of the smaller one of the first sheath pipe and the second sheath pipe.

5. The optical-electrical composite cable according to claim 1, wherein, The number of the optical fiber is 1-4 cores.

6. The fiber optic ribbon of claim 1, wherein the at least one optical fiber is a single fiber. The conductor is a solid copper wire or a multi-stranded twisted copper wire, and the internal stress of the conductor is less than or equal to a first preset value.

7. The fiber optic ribbon of claim 1, wherein the at least one optical fiber is a single fiber. The first sheath pipe is provided with reinforcing yarn, and there is no other reinforcing member inside and outside the first sheath pipe.

8. The fiber optic ribbon cable of any of claims 1-7, wherein the cable further comprises a cable jacket surrounding the plurality of optical ribbons. The twist angle of the optical fiber composite cable per 10m is less than or equal to 0.2°.

9. A photovoltaic tube, characterized by The optical fiber composite cable and a pipeline are provided, the optical fiber composite cable is laid in the pipeline, the inner diameter D1 of the pipeline is 6mm-13mm, and the maximum outer diameter D2 of the optical fiber composite cable satisfies D2+0.1≤D1.

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