A distributed sensing optical cable long-distance tunnel rapid deployment device and method

Abstract

The invention provides a distributed sensing optical cable long-distance tunnel rapid deployment device, comprising a fixed-point strain sensing optical cable and a matching fixing fixture, wherein the fixed-point strain sensing optical cable comprises an optical cable inner core, an optical cable sheath is wrapped on the outer side of the optical cable inner core, a plurality of fixed-point position sleeves are arranged on the outer side of the optical cable sheath, and a plurality of convex reinforced rings are arranged circumferentially on the outer side of the fixed-point position sleeves; the matching fixing fixture uses a metal material as a base and is in a thin sheet strip shape, a bending groove is arranged in the middle of the matching fixing fixture corresponding to the fixed-point position sleeve, an annular groove is extended outwardly from the inner wall of the bending groove corresponding to the reinforced ring, and fixed holes are arranged around both sides of the matching fixing fixture; in view of the increasingly widespread application demand of distributed optical fiber sensing technology and the problems of low construction efficiency and high installation requirements in long-distance tunnel deployment, a series of optimized designs are carried out to make the application of distributed optical fiber technology in long-distance tunnel projects simpler and more efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering optical fiber monitoring, and in particular relates to a device and method for quickly laying out a distributed sensing optical cable in a long-distance tunnel. Background Art

[0002] Optical fiber sensing technology is a new type of sensing detection technology that has developed rapidly in the 1970s based on the development of optical fiber materials and optical fiber communication technology. It uses optical fiber as a medium and light as a carrier, and can achieve (quasi) distributed real-time sensing of external measured information over long distances. It has the advantages of strong electromagnetic and corrosion resistance, lightness and dexterity. In recent years, this technology has been applied to various aspects of civil engineering and has also been widely used in the field of tunnel engineering.

[0003] Compared with traditional conventional sensors, fiber optic sensing technology has good anti-electromagnetic interference capabilities, which is particularly important in detection applications. In particular, distributed fiber optic sensing technology can sense, transmit and locate physical quantities along the optical fiber. Before cracks, leakage and other damage occur along the fiber optic line, changes in strain and temperature are inevitable. Based on the above performance, distributed fiber optic sensing technology can perform large-scale real-time monitoring, avoiding the irrationality of human experience judgment, greatly reducing the probability of missed detection and missed reporting, and providing timely and accurate important information, which highlights the technical advantages in the field of long-distance tunnel engineering.

[0004] At present, the problems existing in distributed optical fiber sensing monitoring technology include the following points: it uses thin and low-strength optical fibers, which are difficult to deploy and have a low success rate; it uses high-strength distributed sensing optical cables, and the survival rate is guaranteed, but the optical cables are fixed by pressing the upper and lower fixing plates together, which on the one hand is easy to cause damage to the optical cables, and on the other hand has high requirements on the point position, and the two clamps fix them, so the deployment efficiency is low; in order to solve the above problems, a device and method for rapid deployment of distributed sensing optical cables in long-distance tunnels are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for quickly laying out distributed sensing optical cables in long-distance tunnels. In view of the increasingly widespread application needs of distributed optical fiber sensing technology and the problems of low construction efficiency and high installation requirements in long-distance tunnel laying, a series of optimized designs are carried out to make the application of distributed optical fiber technology in long-distance tunnel projects simpler and more efficient.

[0006] The present invention provides the following technical solutions:

[0007] A distributed sensing optical cable long-distance tunnel rapid deployment device comprises a fixed-point strain sensing optical cable and a matching fixing fixture, wherein the fixed-point strain sensing optical cable comprises an optical cable inner core, the outer side of the optical cable inner core is wrapped with an optical cable sheath, the outer side of the optical cable sheath is sheathed with a plurality of fixed-point position sleeves, and the outer side of the fixed-point position sleeves is circumferentially provided with a plurality of raised reinforced rings; the matching fixing fixture is made of metal material as a base and is in the shape of a thin sheet strip, a bending groove is provided in the middle of the matching fixing fixture corresponding to the fixed-point position sleeve, an annular groove is provided on the inner wall of the bending groove corresponding to the reinforced ring extending outward, and fixing holes are provided around both sides of the matching fixing fixture.

[0008] Furthermore, the optical cable sheath, the fixed point sleeve and the reinforcement ring are an integrally formed structure.

[0009] Furthermore, the matching fixing fixture is made of stainless steel.

[0010] Furthermore, the matching fixing fixture is installed on the outside of the fixed point sleeve, so that the bending groove fits with the outer wall of the fixed point sleeve, the annular groove fits with the reinforcing ring, the fixing hole has a redundancy of 0.5-1mm from the installation position, and is pressed tightly by rivets.

[0011] A method for quickly laying out a distributed sensing optical cable in a long-distance tunnel comprises the following steps:

[0012] S1. Fixed point: mark the fixed point positions of the supporting fixing fixtures and fixed holes according to the designed route; S2. Drilling: drill holes according to the marked fixed point positions with a pistol drill according to the hole depth requirements; S3. First point fixation: determine the first fixed point position, fix the fixed point position with a supporting fixing fixture through rivets; S4. Pre-tensioning fixation: pre-stretch the inner core and sheath of the optical cable horizontally, use a dynamometer to manually control the stretching weight to keep it stationary, quickly install the supporting fixing fixture, then move the dynamometer with the stretching weight backward, install the next point, and install the supporting fixing fixtures for all remaining fixed points in this way; S5. Detection: after the phased layout of the fixed-point strain sensing optical cable is completed, a distributed strain demodulator is used to collect strain data.

[0013] Furthermore, the tension meter is fixedly connected to the optical cable inner core and the optical cable sheath via a soft rope, and the tension meter value is manually controlled until the installation at the corresponding fixed point position is completed.

[0014] The beneficial effects of the present invention are:

[0015] The invention discloses a method for quickly laying out a distributed sensing optical cable in a long-distance tunnel, which has the following advantages:

[0016] 1. The fixed-point fixing method is adopted, and the test section is the average strain between two adjacent fixed-point sets, which greatly improves the ability of the optical cable to resist large deformation and avoids local excessive deformation and cable disconnection;

[0017] 2. The fixed point position sleeve of the fixed point strain sensing optical cable is embedded and matched with the matching fixing fixture, and the matching fixing fixture covers the fixed point position sleeve position with a distance of 0.5-1mm from the measured structure, and is covered again by rivets to ensure that there is no relative slip between the two, thereby improving the test accuracy;

[0018] 3. The matching fixing fixture is in direct contact with the structure to be measured, which is a one-time fixation, greatly improving the efficiency of laying the sensor optical cable;

[0019] 4. The precise pre-tension control of the tension meter ensures that the sensing optical cable is at the same strain level, which facilitates the analysis and processing of subsequent data;

[0020] 5. The present invention is easy to operate and has relatively low requirements on the levelness of points. Construction personnel can start work and implement it after simple training. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the structure of the fixed-point strain sensing optical cable of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the supporting fixing fixture of the present invention;

[0024] Figure 3 It is a schematic flow chart of the method of the present invention;

[0025] The markings in the figure are: 1. fixed-point strain sensing optical cable, 11. optical cable inner core, 12. optical cable sheath, 13. fixed-point sleeve, 14. reinforced ring, 2. matching fixing fixture, 21. bending groove, 22. ring groove, 23. fixing hole, 3. dynamometer, 31. soft rope. DETAILED DESCRIPTION

[0026] like Figure 1-2As shown, a distributed sensing optical cable long-distance tunnel rapid deployment device includes a fixed-point strain sensing optical cable 1 and a matching fixing fixture 2, the fixed-point strain sensing optical cable 1 includes an optical cable inner core 11, the outer side of the optical cable inner core 11 is wrapped with an optical cable sheath 12, the outer side of the optical cable sheath 12 is sheathed with a plurality of fixed-point position sleeves 13, and the outer side of the fixed-point position sleeves 13 is circumferentially provided with a plurality of protruding reinforcing rings 14; the matching fixing fixture 2 is made of metal material as a base, and is in the shape of a thin sheet strip, a bending groove 21 is provided in the middle of the matching fixing fixture 2 corresponding to the fixed-point position sleeve 13, an annular groove 22 is extended outwardly from the inner wall of the bending groove 21 corresponding to the reinforcing ring 14, and fixing holes 23 are respectively provided around both sides of the matching fixing fixture 2.

[0027] Specifically, the optical cable sheath 12, the fixed point sleeve 13 and the reinforcing ring 14 are an integrally formed structure; the matching fixing fixture 2 is made of stainless steel; the matching fixing fixture 2 is covered and installed on the outside of the fixed point sleeve 13, so that the bending groove 21 fits with the outer wall of the fixed point sleeve 13, the annular groove 22 fits with the reinforcing ring 14, and the fixing hole 23 has a redundancy of 0.5-1mm from the installation position and is pressed tightly by rivets.

[0028] like Figure 3 As shown, a method for quickly laying out a distributed sensing optical cable in a long-distance tunnel comprises the following steps:

[0029] S1, fixed point: according to the design line, mark the fixed point position of the matching fixing fixture 2 and the fixing hole 23;

[0030] S2. Drilling: Drill holes according to the marked fixed point position with a pistol drill according to the hole depth requirements;

[0031] S3, first point fixation: determine the first fixed point position, and fix the fixed point position sleeve 13 by rivets and a matching fixing fixture 2;

[0032] S4, pre-tensioning and fixing: pre-stretch the inner core 11 and the sheath 12 of the optical cable horizontally, use the dynamometer 3 to manually control the stretching weight to keep it still, quickly install the matching fixing fixture 2, then move the dynamometer 3 with the stretching weight backward, install the next point, and install the matching fixing fixture 2 at all the remaining fixed points in this way;

[0033] S5. Detection: After the fixed-point strain sensing optical cable 1 is laid out in stages, a distributed strain demodulator is used to collect strain data.

[0034] Specifically, the tension meter 3 is fixedly connected to the optical cable core 11 and the optical cable sheath 12 through a soft rope 31, and the value of the tension meter 3 is manually controlled until the corresponding fixed point position is installed.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for rapidly laying out distributed sensing optical cables in long-distance tunnels, based on a device for rapidly laying out distributed sensing optical cables in long-distance tunnels, characterized in that: The distributed sensing optical cable long-distance tunnel rapid deployment device comprises a fixed-point strain sensing optical cable and a matching fixing fixture, wherein the fixed-point strain sensing optical cable comprises an optical cable inner core, the outer side of the optical cable inner core is wrapped with an optical cable sheath, the outer side of the optical cable sheath is sheathed with a plurality of fixed-point position sleeves, and the outer side of the fixed-point position sleeve is circumferentially provided with a plurality of convex reinforced rings; the matching fixing fixture is made of metal material as a base and is in the shape of a thin sheet strip, the middle part of the matching fixing fixture is provided with a bending groove corresponding to the fixed-point position sleeve, the inner wall of the bending groove is provided with a ring groove extending outward corresponding to the reinforced ring, and the sides of the matching fixing fixture are respectively provided with fixing holes; The optical cable sheath, the fixed point sleeve and the reinforcement ring are an integrally formed structure; The matching fixing fixture is made of stainless steel; The matching fixing fixture is installed on the outside of the fixed point sleeve so that the bending groove fits with the outer wall of the fixed point sleeve, the annular groove fits with the reinforcing ring, the fixing hole position has a redundancy of 0.5-1mm from the installation position, and is pressed tightly by rivets; The method for quickly laying out a distributed sensing optical cable in a long-distance tunnel comprises the following steps: S1. Fixed point: Mark the fixed point positions of the supporting fixing fixtures and fixing holes according to the designed route; S2. Drilling: Drill holes according to the marked fixed point position with a pistol drill according to the hole depth requirements; S3, first point fixation: determine the first fixed point position, fix the fixed point sleeve with rivets and matching fixing fixtures; S4, pre-tensioning and fixing: pre-stretch the inner core and sheath of the optical cable horizontally, use a tensile gauge to manually control the stretching weight to keep it stationary, quickly install the matching fixing fixture, then move the tensile gauge with the stretching weight backward, install the next point, and install the matching fixing fixtures at all the remaining fixed points in this way; S5. Detection: After the fixed-point strain sensing optical cable is laid out in stages, a distributed strain demodulator is used to collect strain data.

2. A method for rapid deployment of distributed sensing optical cables in long-distance tunnels according to claim 1, characterized in that: The tension meter is fixedly connected to the inner core of the optical cable and the sheath of the optical cable through a soft rope, and the tension meter value is manually controlled until the installation at the corresponding fixed point position is completed.

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