Optical fiber anti-intrusion device for underground comprehensive pipe gallery

Abstract

The present invention relates to the field of underground integrated pipe gallery protection technology, specifically to an optical fiber anti-intrusion device for underground integrated pipe gallery, comprising a diaphragm differential pressure gauge and a mounting head fixed on one side of a to-be-detected area, wherein one end of the mounting head close to the to-be-detected area is fixedly sleeved with an elastic rod, the elastic rod is arranged along the length direction of the to-be-detected area and extends to the other side of the to-be-detected area, an end of the elastic rod away from the mounting head is externally sleeved with a connecting elbow, an end of the elastic rod located in the connecting elbow is hinged with a connecting head, and the other end of the connecting head is hinged with a piston, a water tank is provided at the other end of the connecting elbow and is submerged underwater, and the diaphragm differential pressure gauge comprises a sealed metal shell, a pressure diaphragm is provided in the metal shell, an optical fiber grating is fixed on the pressure diaphragm, and both sides of the pressure diaphragm of the diaphragm differential pressure gauge are connected to the connecting elbow. The present invention can avoid the problem of underreporting easily caused by point detection, and has the advantages of simple structure and low monitoring cost.

Description

Technical Field

[0001] The invention relates to the technical field of underground comprehensive pipe gallery protection, and in particular to an optical fiber anti-intrusion device for an underground comprehensive pipe gallery. Background Art

[0002] The underground comprehensive pipeline corridor, also known as the common trench, is a municipal public tunnel that is uniformly planned, designed, constructed and maintained. It is built underground in the city for the centralized laying of various municipal pipelines such as water supply, drainage, gas, electricity, and communications.

[0003] Since there are a large number of electrical cables, optical cables and metal objects inside the integrated utility corridor, accidents affecting the safe operation of the integrated utility corridor due to human theft often occur. After the equipment and facilities are stolen, the illegal intruders only gain very little benefit, but the safety hazards and direct economic losses to the safe operation inside the utility corridor will be immeasurable.

[0004] Among them, the optical fiber cables used for communication are of high value and have a high probability of being stolen. Therefore, it is necessary to design an intrusion detection system or device to promptly detect illegal intrusions. Existing detection systems include monitoring systems based on interference structures and those based on fiber grating vibration technology. Based on the principle of fiber interference, due to its wide detection band, high cost, and discontinuous distribution, there will be a slightly higher false alarm rate and detection blind spots. Perimeter products based on fiber grating vibration technology connect fiber grating vibration sensors in series into a vibration detection array, attached to a protective net, and can alarm for intrusions. However, the existing type requires the deployment of a large number of sensors, has a complex structure, and also has the problem of high cost. Summary of the invention

[0005] The purpose of the present invention is to provide an optical fiber anti-intrusion device for an underground comprehensive pipe gallery, which can avoid the problem of underreporting easily caused by point detection and has the advantages of simple structure and low monitoring cost.

[0006] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0007] An optical fiber intrusion prevention device for an underground integrated pipe gallery comprises a diaphragm differential pressure gauge and a mounting head fixed on one side of an area to be detected, wherein an end of the mounting head close to the area to be detected is fixedly sleeved with an elastic rod, the elastic rod is arranged along the length direction of the area to be detected and extends to the other side of the area to be detected, an end of the elastic rod away from the mounting head is movably sleeved with a connecting elbow, an end of the elastic rod located in the connecting elbow is hinged with a connecting head, and an end of the connecting head away from the elastic rod is hinged with a piston adapted to the inner peripheral wall of the connecting elbow, a water tank is provided at the other end of the connecting elbow, and the end of the connecting elbow is submerged under water, the diaphragm differential pressure gauge comprises a sealed metal shell, a pressure diaphragm is provided in the metal shell, a fiber grating is fixed on the pressure diaphragm, and both sides of the pressure diaphragm of the diaphragm differential pressure gauge are connected to the connecting elbow;

[0008] When the elastic rod is subjected to external pressure, it deforms, and the end of the elastic rod drives the piston to pull outward. The water in the water tank is sucked into the connecting elbow and causes the pressure diaphragm to displace, driving the fiber optic Bragg grating installed on the center of the diaphragm to deform. By measuring the changes in the characteristic wavelength reflected by the fiber optic Bragg grating, the detection of external intrusion behavior is achieved.

[0009] In the optical fiber anti-intrusion device for underground comprehensive pipe gallery described in the present invention, the optical fiber Bragg grating is attached to the pressure diaphragm by bonding.

[0010] In the optical fiber intrusion prevention device for the underground integrated pipe gallery described in the present invention, the pressure diaphragm is a metal diaphragm.

[0011] In the underground integrated pipe gallery optical fiber intrusion prevention device described in the present invention, the water tank is an open water tank.

[0012] Compared with the prior art, the present invention provides an optical fiber anti-intrusion device for an underground integrated pipe gallery, which has the following beneficial effects: the present invention utilizes the deformation of an elastic rod due to intrusion and converts it into the displacement of a pressure diaphragm on a diaphragm differential pressure gauge, thereby driving the optical fiber grating to deform to achieve the purpose of monitoring, thereby avoiding the problem of underreporting caused by improper sensitivity setting that may be introduced by point detection; and at the same time has the advantages of simple structure and low monitoring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the optical fiber anti-intrusion device of the present invention.

[0014] In the figure: 1. mounting head; 2. elastic rod; 3. connecting head; 4. piston; 5. connecting elbow; 6. water tank; 7. diaphragm differential pressure gauge; 8. pressure diaphragm; 9. fiber Bragg grating. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example: See Figure 1 The present application provides an optical fiber intrusion prevention device for an underground integrated pipe gallery, comprising a diaphragm type differential pressure gauge 7 and an installation head 1 fixed on one side of an area to be detected, wherein an elastic rod 2 is fixedly sleeved on one end of the installation head 1 close to the area to be detected, and the elastic rod 2 is arranged along the length direction of the area to be detected and extends to the other side of the area to be detected, and a connecting elbow 5 is movably sleeved on the outside of one end of the elastic rod 2 away from the installation head 1, and an end of the elastic rod 2 located in the connecting elbow 5 is hinged with a connecting head 3, and an end of the connecting head 3 away from the elastic rod 2 is hinged with a piston 4 adapted to the inner circumferential wall of the connecting elbow 5, an open water tank 6 is provided at the other end of the connecting elbow 5, and the end of the connecting elbow 5 is submerged in water, and the diaphragm type differential pressure gauge 7 comprises a sealed metal shell, a metal pressure diaphragm 8 is provided in the metal shell, a fiber grating 9 is attached and fixed to the pressure diaphragm 8 by bonding, and both sides of the pressure diaphragm 8 of the diaphragm type differential pressure gauge 7 are connected to the connecting elbow 5.

[0017] When the anti-intrusion device provided by the present application is deployed and monitored, when the elastic rod 2 is subjected to external pressure such as touch, the elastic rod 2 is deformed. Since the elastic rod 2 is fixed at one end close to the installation head 1, the other end of the solid elastic rod 2 drives the piston 4 to be pulled outward along the inner wall of the connecting elbow 5, and the pressure in the connecting elbow 5 is reduced. The water in the water tank 6 is sucked into the connecting elbow 5 under the action of the pressure difference and causes the pressure diaphragm 8 to be displaced, thereby driving the fiber optic Bragg grating 9 installed in the center of the diaphragm to deform, and the detection of external intrusion behavior is achieved by measuring the change in the characteristic wavelength reflected by the fiber optic Bragg grating 9.

[0018] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical fiber anti-intrusion device for underground integrated pipe gallery, characterized by: The invention comprises a diaphragm differential pressure gauge (7) and a mounting head (1) fixed on one side of an area to be detected, wherein an end of the mounting head (1) close to the area to be detected is fixedly sleeved with an elastic rod (2), the elastic rod (2) is arranged along the length direction of the area to be detected and extends to the other side of the area to be detected, an end of the elastic rod (2) away from the mounting head (1) is movably sleeved with a connecting elbow (5), an end of the elastic rod (2) located inside the connecting elbow (5) is hingedly connected with a connecting head (3), and the connecting head ( 3) A piston (4) adapted to the inner circumferential wall of the connecting elbow (5) is hingedly connected to one end away from the elastic rod (2); a water tank (6) is provided at the other end of the connecting elbow (5), and the end of the connecting elbow (5) is submerged under water; the diaphragm differential pressure gauge (7) comprises a sealed metal shell, a pressure diaphragm (8) is provided in the metal shell, a fiber grating (9) is fixed on the pressure diaphragm (8), and both sides of the pressure diaphragm (8) of the diaphragm differential pressure gauge (7) are connected to the connecting elbow (5); When the elastic rod (2) is subjected to external pressure, the elastic rod (2) is deformed, and the end of the elastic rod (2) drives the piston (4) to pull outward, so that the water in the water tank (6) is sucked into the connecting elbow (5) and causes the pressure diaphragm (8) to be displaced, driving the optical fiber Bragg grating (9) installed at the center of the diaphragm to be deformed, and detecting the external intrusion behavior is achieved by measuring the change of the characteristic wavelength reflected by the optical fiber Bragg grating (9); The optical fiber Bragg grating (9) is attached to the pressure membrane (8) by bonding; The pressure diaphragm (8) is a metal diaphragm; The water tank (6) is an open water tank (6).

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