A Wiring Method for Borrowing and Connecting Strings of a Vibration String Monitoring Instrument When Buried Cables Are Damaged

Abstract

The present invention provides a method for borrowing and connecting wires of a vibrating wire monitoring instrument when an embedded cable is damaged, including a monitoring instrument, an embedded cable group, and an outgoing cable group. The monitoring instrument corresponding to the abnormal embedded cable group is denoted as the target monitoring instrument, and the corresponding outgoing cable group is denoted as the target outgoing cable group; the attribute output port of the target monitoring instrument is connected to the cable channel corresponding to the attribute in the target outgoing cable group through a cable channel corresponding to the attribute in a group of normal embedded cable groups; the attribute input port of the target monitoring instrument is connected to the loop cable channel corresponding to the attribute in the target outgoing cable group through a cable channel corresponding to the attribute in another group of normal embedded cable groups. In the case of damage to the embedded monitoring cable, the present invention processes the wiring method when the embedded cable of the monitoring instrument is damaged through the "wire borrowing method", and "borrows" the signal of the monitoring instrument corresponding to the damaged embedded cable and accesses it through the embedded monitoring cable of other monitoring instruments, which has the advantages of simplicity and convenience.

Description

Technical Field

[0001] The present invention relates to the field of the use of vibrating wire monitoring instruments, and particularly relates to a method for borrowing and connecting wires of a vibrating wire monitoring instrument when a buried cable is damaged. Background Technique

[0002] During engineering construction, monitoring instruments are needed to monitor the target. The commonly used monitoring instruments are mainly vibrating wire instruments and differential resistance instruments. The vibrating wire monitoring instrument is a widely used non-electric quantity electrical measurement sensor. Since it directly outputs the self-vibration frequency signal of the vibrating wire, it has the characteristics of strong anti-interference ability, small influence by electrical parameters, small influence by temperature, and stable and reliable performance. The vibrating wire monitoring instrument mainly measures the analog-digital signal (the square of the vibration frequency) and the temperature signal to monitor data such as stress and strain of the monitored part. The signal transmission generally uses a four-core shielded cable.

[0003] When using monitoring instruments, signal transmission cables such as cables are required. Cables laid in open pipes have a great influence on the signal stability. Therefore, it is very difficult to install monitoring cables in the way of open pipe laying, and generally the buried cable method is adopted. During the construction of tunnel projects, due to the problem of pouring sequence, it is generally necessary to bury the monitoring cable first and then install the monitoring instrument. Therefore, the integrity rate of the monitoring cable has become the key guarantee for restricting the signal transmission rate of the monitoring instrument. However, in reality, since construction such as pouring needs to continue after burying the cable, the situation of damaged monitoring cables is likely to occur. Once the monitoring cable is damaged, it will directly affect the signal transmission of the monitoring instrument. Summary of the Invention

[0004] In order to solve the problems existing in the background technique, the present invention proposes a method for borrowing and connecting wires of a vibrating wire monitoring instrument when a buried cable is damaged.

[0005] A method for borrowing and connecting wires of a vibrating wire monitoring instrument when a buried cable is damaged, including a monitoring instrument, a buried cable group, and a lead-out cable group. The monitoring instrument corresponding to the abnormal buried cable group is denoted as the target monitoring instrument, and the lead-out cable group corresponding to the abnormal buried cable group is denoted as the target lead-out cable group; the attribute of the monitoring instrument refers to the type of monitoring data, including temperature signal and analog-digital signal. The wiring method of the borrowing circuit for each attribute of the target monitoring instrument is: an output port of a certain attribute of the target monitoring instrument is connected to a cable channel of the same attribute in a group of normal buried cable groups through a cable channel of the same attribute in the target lead-out cable group; an input port of the same attribute of the target monitoring instrument is connected to a loop cable channel of the same attribute in the target lead-out cable group through a cable channel of the same attribute in another group of normal buried cable groups.

[0006] Based on the above, the attribute refers to the type of monitoring data of the monitoring instrument, including temperature signal and analog-digital signal.

[0007] Based on the above, the shielded cable port of the target monitoring instrument is connected to the shielded cable channel in the target outgoing cable group through a shielded cable channel in a group of normal pre-buried cable groups.

[0008] Based on the above, when there are four groups corresponding to the monitoring instrument, the pre-buried cable group, and the outgoing cable group respectively, and there are two groups of abnormal pre-buried cable groups; a certain attribute output port of the first target monitoring instrument is connected to the cable channel with the same attribute in the first target outgoing cable group through a cable channel with the same attribute in the first normal pre-buried cable group; the input port with the same attribute of the first target monitoring instrument is connected to the loop cable channel with the same attribute in the first target outgoing cable group through a cable channel with the same attribute in the second normal pre-buried cable group; a certain attribute output port of the second target monitoring instrument is connected to the cable channel with the same attribute in the second target outgoing cable group through another cable channel with the same attribute in the first normal pre-buried cable group; the input port with the same attribute of the second target monitoring instrument is connected to the loop cable channel with the same attribute in the second target outgoing cable group through another cable channel with the same attribute in the second normal pre-buried cable group.

[0009] The present invention has prominent substantive features and remarkable progress compared with the prior art. Specifically, when the pre-buried monitoring cable is damaged, the present invention uses the "cable borrowing method" to handle the wiring method when the pre-buried cable of the monitoring instrument is damaged, and "borrows" the signal of the monitoring instrument corresponding to the damaged pre-buried cable to access through the pre-buried monitoring cable of other monitoring instruments, which has the advantages of convenient use, simple and fast operation, and low cost. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the "2 with 3" wiring method of the present invention.

[0011] Figure 2 It is a schematic diagram of the "2 with 4" wiring method of the present invention. Detailed Embodiments

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0013] A wiring method for borrowing and connecting a vibrating wire monitoring instrument when an embedded cable is damaged, including a monitoring instrument, an embedded cable group, and an outgoing cable group. The monitoring instrument refers to a vibrating wire monitoring instrument. Generally, a vibrating wire monitoring instrument has five ports. Two ports form a loop through cables for transmitting and monitoring temperature signals. Two ports form a loop through cables for transmitting and monitoring analog-digital signals. The last port is connected to a shielded cable for shielding interference factors such as peripheral electromagnetic signals. Correspondingly, the cable group described in this solution is a four-core shielded cable, which includes two cables for transmitting temperature signals, two cables for transmitting analog-digital signals, and one shielded cable in the group. In reality, the temperature monitoring port and the analog-digital monitoring port of the monitoring instrument are respectively connected to the outgoing cable through the embedded cable and form a loop.

[0014] A normal monitoring instrument is connected to a corresponding normal outgoing cable group through a corresponding normal embedded cable group. The monitoring instrument corresponding to the abnormal embedded cable group is denoted as the target monitoring instrument, and the outgoing cable group corresponding to the abnormal embedded cable group is denoted as the target outgoing cable group; a certain attribute output port of the target monitoring instrument is connected to the cable channel of the same attribute in the target outgoing cable group through a cable channel of the same attribute in a group of normal embedded cable groups; the input port of the same attribute of the target monitoring instrument is connected to the loop cable channel of the same attribute in the target outgoing cable group through a cable channel of the same attribute in another group of normal embedded cable groups. The attribute refers to the monitoring data type of the monitoring instrument, including temperature signals and analog-digital signals.

[0015] The shielded cable port of the target monitoring instrument is connected to the shielded cable channel in the target outgoing cable group through a shielded cable channel in a group of normal embedded cable groups.

[0016] Illustrated with specific embodiments as follows:

[0017] Embodiment 1

[0018] In this embodiment, two groups of normal embedded cable groups are used to connect three monitoring instruments, that is, the "2 with 3" wiring method:

[0019] As Figure 1 shown, the first embedded cable group and the third embedded cable group are normal embedded cable groups. The first monitoring instrument is normally connected to the first outgoing cable group through the first embedded cable group, and the third monitoring instrument is normally connected to the third outgoing cable group through the third embedded cable group.

[0020] The second embedded cable group is a damaged embedded cable group, that is, an abnormal embedded cable group. Its corresponding second monitoring instrument is the target monitoring instrument, and its corresponding second outgoing cable group is the target outgoing cable group.

[0021] When wiring by the "borrowing line" method, a temperature signal monitoring port of the second monitoring instrument (since the attached drawing is a schematic diagram, the port is not clearly shown in the figure, and only the intersection of the monitoring instrument and the signal line is shown in the figure) is connected to a temperature outgoing cable of the second outgoing cable group through a temperature signal line and a buried temperature signal line of the first buried cable group. Another temperature signal monitoring port of the second monitoring instrument (there is no need to distinguish between the input port or the output port) is connected to another temperature outgoing cable of the second outgoing cable group through a temperature signal line and a buried temperature signal line of the third buried cable group, thereby forming a temperature signal monitoring loop. Similarly, a digital-analog signal monitoring port of the second monitoring instrument is connected to a digital-analog outgoing cable of the second outgoing cable group through a digital-analog signal line and a buried digital-analog signal line of the first buried cable group. Another digital-analog signal monitoring port of the second monitoring instrument is connected to another digital-analog outgoing cable of the second outgoing cable group through a digital-analog signal line and a buried digital-analog signal line of the third buried cable group, thereby forming a digital-analog signal monitoring loop. The shielding port of the second monitoring instrument is connected to the shielding cable in the second outgoing cable group through a shielding cable and the buried shielding cable in the first buried cable group.

[0022] Embodiment 2

[0023] In this embodiment, two normal buried cable groups are used to connect four monitoring instruments, that is, the "2 with 4" wiring method:

[0024] As Figure 2 shown, the first buried cable group and the fourth buried cable group are normal buried cable groups. The first monitoring instrument is normally connected to the first outgoing cable group through the first buried cable group, and the fourth monitoring instrument is normally connected to the fourth outgoing cable group through the fourth buried cable group.

[0025] The second buried cable group is a damaged buried cable group, that is, an abnormal buried cable group. The corresponding second monitoring instrument is the first target monitoring instrument, and the corresponding second outgoing cable group is the first target outgoing cable group. The third buried cable group is a damaged buried cable group, that is, an abnormal buried cable group. The corresponding third monitoring instrument is the second target monitoring instrument, and the corresponding third outgoing cable group is the second target outgoing cable group.

[0026] When wiring by the "borrowing line" method, one temperature signal monitoring port of the second monitoring instrument is connected to a temperature outgoing cable of the second outgoing cable group through a temperature signal line and a buried temperature signal line of the first buried cable group. Another temperature signal monitoring port of the second monitoring instrument is connected to another temperature outgoing cable of the second outgoing cable group through a temperature signal line and a buried temperature signal line of the fourth buried cable group, thus forming a temperature signal monitoring loop. Similarly, one analog-digital signal monitoring port of the second monitoring instrument is connected to an analog-digital outgoing cable of the second outgoing cable group through an analog-digital signal line and a buried analog-digital signal line of the first buried cable group. Another analog-digital signal monitoring port of the second monitoring instrument is connected to another analog-digital outgoing cable of the second outgoing cable group through an analog-digital signal line and a buried analog-digital signal line of the fourth buried cable group, thus forming an analog-digital signal monitoring loop. The shielding port of the second monitoring instrument is connected to the shielding cable in the second outgoing cable group through a shielding cable and the buried shielding cable in the first buried cable group. One temperature signal monitoring port of the third monitoring instrument is connected to a temperature outgoing cable of the third outgoing cable group through a temperature signal line and another buried temperature signal line of the first buried cable group. Another temperature signal monitoring port of the third monitoring instrument is connected to another temperature outgoing cable of the third outgoing cable group through a temperature signal line and another buried temperature signal line of the fourth buried cable group, thus forming a temperature signal monitoring loop. Similarly, one analog-digital signal monitoring port of the third monitoring instrument is connected to an analog-digital outgoing cable of the third outgoing cable group through an analog-digital signal line and another buried analog-digital signal line of the first buried cable group. Another analog-digital signal monitoring port of the third monitoring instrument is connected to another analog-digital outgoing cable of the third outgoing cable group through an analog-digital signal line and another buried analog-digital signal line of the fourth buried cable group, thus forming an analog-digital signal monitoring loop. The shielding port of the third monitoring instrument is connected to the shielding cable in the third outgoing cable group through a shielding cable and the buried shielding cable in the fourth buried cable group.

[0027] The target monitoring instrument has a total of two groups of monitoring signals, namely temperature signals and analog-digital signals. Each signal requires two transmission lines to transmit the signal. When the same-attribute transmission signals of the two monitoring instruments are connected to the two transmission lines of the same attribute in the same buried cable group, the transmitted signals will cross and cause data errors. Therefore, the signal transmission of the target monitoring instrument borrows one buried transmission cable from each of the two undamaged buried cable groups, which ensures that the channels of each group of signals are independent of each other and avoids data transmission errors. The shielding cable is mainly used to shield external interference signals. Using a common buried shielding cable for the two monitoring instruments has no impact on the instrument readings.

[0028] The commonly used detection instruments at present are mainly vibrating wire instruments and differential resistance transducers. The differential resistance transducer uses a set of differential resistors R1 and R2 to form a bridge circuit with a resistance ratio bridge to measure two parameters, namely the resistance ratio and the resistance value, and then calculates the stress (deformation) borne by the instrument and the temperature of the measuring point. Generally, the signal is transmitted by a five-core cable, and the requirement for resistance is relatively high. When using the "borrowed wire" wiring method, on the one hand, problems such as resistance series connection and signal crossover are likely to occur, and on the other hand, due to the high requirement for resistance, signal distortion is likely to occur. Therefore, this wiring method is not applicable to differential resistance transducers.

[0029] The "borrowed wire" wiring method is mainly applicable to the emergency treatment when the embedded monitoring cable is damaged. According to the working principle of the vibrating wire instrument, it is possible to realize the method of connecting multiple sensors in parallel with a common cable. However, considering the safety of signal transmission, it is not recommended to use this wiring method under normal circumstances.

[0030] In this embodiment, the "2 with 3" and "2 with 4" borrowed wire wiring methods are described. Although theoretically, more borrowed wires can solve more problems of damaged detection signal transmission. However, in order to ensure the safety of the signal in the later stage, it is not recommended to use wiring methods such as "2 with multiple" or "3 with multiple". The borrowed wire method is only applicable to the situation where the embedded monitoring cable is damaged and cannot be repaired, which can ensure the complete output of the monitoring instrument signal and improve the integrity rate of the instrument signal.

[0031] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A method for borrowing and connecting wires of a vibrating wire monitoring instrument when an embedded cable is damaged, including a monitoring instrument, an embedded cable group, and an outgoing cable group, characterized in that: The monitoring instrument corresponding to the abnormal embedded cable group is denoted as the target monitoring instrument, and the outgoing cable group corresponding to the abnormal embedded cable group is denoted as the target outgoing cable group; The attribute of the monitoring instrument refers to the type of monitoring data, including temperature signals and analog-digital signals. The method for wiring the borrowing circuit of each attribute of the target monitoring instrument is as follows: an output port of a certain attribute of the target monitoring instrument is connected to a cable channel of the same attribute in a group of normal embedded cable groups, and then connected to the cable channel of the same attribute in the target outgoing cable group; The input port of the same attribute of the target monitoring instrument is connected to a cable channel of the same attribute in another group of normal embedded cable groups, and then connected to the loop cable channel of the same attribute in the target outgoing cable group.

2. The method for borrowing and connecting wires of a vibrating wire monitoring instrument when an embedded cable is damaged according to claim 1, characterized in that: The shielded cable port of the target monitoring instrument is connected to the shielded cable channel in the target outgoing cable group through a shielded cable channel in a group of normal embedded cable groups.

3. The method for borrowing and connecting wires of a vibrating wire monitoring instrument when an embedded cable is damaged according to claim 1, characterized in that: There are four groups corresponding to the monitoring instrument, the embedded cable group, and the outgoing cable group respectively. When there are two abnormal embedded cable groups; An output port of a certain attribute of the first target monitoring instrument is connected to a cable channel of the same attribute in the first normal embedded cable group, and then connected to the cable channel of the same attribute in the first target outgoing cable group; The input port of the same attribute of the first target monitoring instrument is connected to a cable channel of the same attribute in the second normal embedded cable group, and then connected to the loop cable channel of the same attribute in the first target outgoing cable group; An output port of a certain attribute of the second target monitoring instrument is connected to another cable channel of the same attribute in the first normal embedded cable group, and then connected to the cable channel of the same attribute in the second target outgoing cable group; The input port of the same attribute of the second target monitoring instrument is connected to another cable channel of the same attribute in the second normal embedded cable group, and then connected to the loop cable channel of the same attribute in the second target outgoing cable group.

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