CN113431593B - Shield tunneling machine and shield tail brush dynamic sealing performance monitoring control method thereof - Google Patents
Shield tunneling machine and shield tail brush dynamic sealing performance monitoring control method thereof Download PDFInfo
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- CN113431593B CN113431593B CN202110886191.6A CN202110886191A CN113431593B CN 113431593 B CN113431593 B CN 113431593B CN 202110886191 A CN202110886191 A CN 202110886191A CN 113431593 B CN113431593 B CN 113431593B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 125
- 238000007789 sealing Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005641 tunneling Effects 0.000 title claims description 29
- 239000004519 grease Substances 0.000 claims abstract description 106
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000005299 abrasion Methods 0.000 claims abstract description 25
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 238000012937 correction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a shield machine and a shield tail brush dynamic sealing performance monitoring control method thereof, wherein a plurality of annular shield tail brushes are arranged at intervals at the tail part of the shield machine, an annular grease cavity for injecting grease for sealing is arranged between the two shield tail brushes, a pressure sensor is arranged in the annular grease cavity, the two shield tail brushes positioned at the forefront are respectively provided with a monitoring sensor for monitoring wear loss and deformation, and the pressure sensor and the monitoring sensors are in signal connection with a control device. The shield tail brush sealing and abrasion conditions can be monitored in real time, the grease injection amount can be automatically adjusted according to actual feedback information, and the replacement operation of the detachable shield tail brush can be planned in advance according to the abrasion and deformation of the shield tail brush, so that the shield machine provided by the invention not only can prolong the service life of the shield tail brush and improve the shield tail sealing performance, but also can assist shield deviation correction on the shield machine, adjust the shield posture in real time, improve the quality of a formed tunnel, improve the safety and reduce the construction risk.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a shield tunneling machine and a shield tail brush dynamic sealing performance monitoring control method thereof.
Background
At present, most tail seals of shield machines adopt a plurality of shield tail brushes fixed on the inner wall of the shield tail of the shield machine in an annular dense arrangement mode and an annular grease cavity formed by two adjacent shield tail brushes in the front and the back for injecting grease to effectively seal.
When the shield machine normally tunnels, the shield tail brush is in close contact with the outer wall of the lined segment, which is a key sealing measure for preventing the shield tail from water leakage, sand gushing, mud channeling and the like, and the shield construction safety, quality and progress are directly influenced by the quality of the sealing performance of the shield tail brush.
However, as the shield tail brush is a vulnerable part, the shield tail brush is easy to wear and crush in shield construction, especially when grease injection is insufficient, the shield attitude deviates from a set route or a tunnel is driven in a small turn, the shield tail brush often has phenomena of rapid wear or permanent deformation failure, and the like, if the damaged position of the shield tail brush cannot be found in time, the problem of water leakage and slurry leakage occurs in a small scale, construction safety and progress are affected, soil body collapse is caused greatly, and safety accidents such as machine damage and human death are caused greatly.
Therefore, how to provide a shield machine to improve safety is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a shield tunneling machine to improve safety. The invention aims to provide a shield tail brush dynamic sealing performance monitoring and controlling method.
In order to achieve the purpose, the invention provides the following technical scheme:
a shield machine is provided with a plurality of annular shield tail brushes arranged at intervals at the tail part, an annular grease cavity for injecting grease for sealing is arranged between the two shield tail brushes, a pressure sensor is arranged in the annular grease cavity,
the two shield tail brushes positioned at the forefront are respectively provided with a monitoring sensor for monitoring the abrasion loss and the deformation quantity,
the pressure sensor and the monitoring sensor are in signal connection with a control device.
Preferably, be located the two in the forefront the shield tail brush is detachable, all the other the shield tail brush is welded fastening.
Preferably, the annular grease cavities are arranged in equal width,
annular grease chamber is provided with a plurality of notes fat holes along circumference, adopt single chamber single pump with annotate fat hole intercommunication control grease volume of living, adjacent two the arc length interval along circumference between the notes fat hole is not more than 2.5 m.
Preferably, the monitoring sensors are a plurality of, and the monitoring sensors are uniformly arranged in annular equal included angles.
Preferably, the two shield tail brushes positioned at the forefront are a first shield tail brush and a second shield tail brush from front to back in sequence,
the minimum included angle between the monitoring sensor on the first shield tail brush and the monitoring sensor on the second shield tail brush in the circumferential direction is 22.5 degrees,
the monitoring sensor on the first shield tail brush and the monitoring sensor on the second shield tail brush equally divide the shield tail brush into 16 areas on the cross section for real-time monitoring.
Preferably, the pressure sensors are arranged in a plurality of annular equal included angles.
The invention also provides a shield tail brush dynamic sealing performance monitoring and controlling method, based on any one of the shield tunneling machine, comprising:
step 1) normally tunneling by the shield machine, detecting the pressure value P of the annular grease cavity on the point position in real time by the pressure sensor and continuously transmitting the pressure value P to the control device,
the monitoring sensor detects the abrasion amount lambda and the deformation amount delta of the shield tail brush on the point position in real time and transmits the abrasion amount lambda and the deformation amount delta to the control device continuously;
step 2) the control device compares the pressure value P with a preset pressure value P0, when P is larger than or equal to P0, the grease in the annular grease cavity at the point position is in a saturated state,
when P is less than P0, grease in the ring-shaped grease cavity at the point position is in an unfilled state, the control device sends out a grease injection instruction until P is more than or equal to P0 and stops grease injection,
the control device respectively compares the wear amount lambda and the deformation amount delta with a preset wear amount lambda 0 and a preset deformation amount delta 0, when lambda is less than lambda 0 and delta is less than delta 0, the point where the shield tail brush is located has no problem,
when lambda is less than lambda 0 and delta is more than or equal to delta 0, the shield tail brush is in an over-compression state at the point position, the control device controls the shield tunneling machine to adjust the posture until lambda is less than lambda 0 and delta is less than delta 0,
and when the lambda is more than or equal to lambda 0, injecting grease or replacing the shield tail brush.
Preferably, the step 2) is specifically,
if the control device controls the shield tunneling machine to adjust the posture and cannot realize that lambda is larger than lambda 0 and delta is smaller than delta 0, comparing the number K of the monitoring sensors for measuring delta to be larger than or equal to delta 0 with the preset number K0, injecting grease when K is larger than K0, and replacing the shield tail brush when K is larger than or equal to K0.
Preferably, the step 2) is specifically,
when the lambda is larger than or equal to lambda 0, comparing the number M of the monitoring sensors with the preset number M0, wherein the number M of the monitoring sensors is larger than or equal to lambda 0, injecting grease when the number M is smaller than M0, and replacing the shield tail brush when the number M is larger than or equal to M0.
Preferably, the control device displays the values of the pressure sensor and the monitoring sensor, the compared result and the action command on a circular display panel according to the positions of the pressure sensor and the monitoring sensor on the cross section of the shield tunneling machine,
and a flashing indicator light which gives an alarm corresponding to the monitoring sensor is arranged on the display panel.
The shield machine provided by the invention has the advantages that the tail part is provided with a plurality of annular shield tail brushes which are arranged at intervals, an annular grease cavity for injecting grease for sealing is arranged between the two shield tail brushes, a pressure sensor is arranged in the annular grease cavity,
the two shield tail brushes positioned at the forefront are respectively provided with a monitoring sensor for monitoring the abrasion loss and the deformation quantity,
the pressure sensor and the monitoring sensor are in signal connection with a control device.
The shield machine provided by the invention can monitor the sealing and abrasion conditions of the shield tail brush in real time, automatically adjust the grease injection amount or the extension amount of the thrust cylinder according to actual feedback information, and plan the replacement operation of the detachable shield tail brush in advance according to the abrasion and deformation of the shield tail brush, so that the shield machine provided by the invention not only can prolong the service life of the shield tail brush and improve the sealing performance of the shield tail, but also can perform auxiliary shield deviation correction on the shield machine, adjust the shield posture in real time, improve the quality of a formed tunnel, improve the safety and reduce the construction risk.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a shield tunneling machine according to an embodiment of the present invention during operation;
fig. 2 is a schematic structural diagram of a shield tail brush part of a shield tunneling machine according to an embodiment of the present invention;
fig. 3 is a schematic combination diagram of a first shield tail brush and a second shield tail brush on a cross section of a shield tail brush provided by an embodiment of the present invention, where the first shield tail brush and the second shield tail brush monitor sensor arrangement points;
FIG. 4 is a schematic diagram of a location of a pressure sensor on a cross section of a shield tail brush provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of a display panel of a pressure sensor according to an embodiment of the present invention;
fig. 6 is a schematic view of a display panel of a monitoring sensor according to an embodiment of the present invention.
In the above FIGS. 1-6:
the shield tail brush comprises a shield tail brush 1, a monitoring sensor 2, a pressure sensor 3, an annular grease cavity 4, a welding type shield tail brush 5, a communication cable 6, a control device 7, a shield machine 8, a lining segment 9, a shield machine main control chamber 10, a propelling oil cylinder 11, a grease injection channel 12, a first shield tail brush 13, a second shield tail brush 14, a monitoring sensor arrangement point position 15 on the first shield tail brush, a monitoring sensor arrangement point position 16 on the second shield tail brush, a pressure sensor arrangement point position 17 and a grease injection hole 18.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 6, fig. 1 is a schematic diagram of a shield tunneling machine according to an embodiment of the present invention during operation;
fig. 2 is a schematic structural diagram of a shield tail brush part of a shield tunneling machine according to an embodiment of the present invention; fig. 3 is a schematic combination diagram of a first shield tail brush and a second shield tail brush on a cross section of a shield tail brush provided by an embodiment of the present invention, where the first shield tail brush and the second shield tail brush monitor sensor arrangement points; FIG. 4 is a schematic diagram of a location of a pressure sensor on a cross section of a shield tail brush provided by an embodiment of the invention; FIG. 5 is a schematic diagram of a display panel of a pressure sensor according to an embodiment of the present invention; fig. 6 is a schematic view of a display panel of a monitoring sensor according to an embodiment of the present invention.
The shield machine 8 provided by the embodiment of the invention has the advantages that the tail part is provided with a plurality of annular shield tail brushes 1 which are arranged at intervals, the shield tail brushes 1 are closely contacted with the outer wall of a lined duct piece 9, an annular grease cavity 4 for injecting grease for sealing is arranged between the two shield tail brushes 1, a pressure sensor 3 is arranged in the annular grease cavity 4,
the two shield tail brushes positioned at the forefront are both provided with monitoring sensors 2 for monitoring the abrasion loss and the deformation,
the pressure sensor 3 and the monitoring sensor 2 are in signal connection with a control device 7.
The shield machine 8 provided by the embodiment of the invention can monitor the sealing and abrasion conditions of the shield tail brush 1 in real time, automatically adjust the grease injection amount or the extension amount of the thrust cylinder 11 according to actual feedback information, and plan the replacement operation of the detachable shield tail brush in advance according to the abrasion and deformation amount of the shield tail brush 1, so that the shield machine provided by the embodiment of the invention not only can prolong the service life of the shield tail brush and improve the sealing performance of the shield tail, but also can perform auxiliary shield rectification on the shield machine 8 and adjust the shield posture in real time, thereby improving the quality of a formed tunnel, improving the safety and reducing the construction risk.
In order to further optimize the scheme, the annular grease cavity 4 is arranged in an equal-width mode, a plurality of grease injection holes 18 are formed in the annular grease cavity 4 along the circumferential direction, a single-cavity single pump is communicated with the grease injection holes 18 to control the grease injection amount, the arc length distance between every two adjacent grease injection holes 18 along the circumferential direction is not larger than 2.5m, as shown in fig. 4, as can be seen in fig. 4, two grease injection holes 18 are arranged in each of 8 regions which are equally divided by four diameter lines, the two grease injection holes 18 in the adjacent regions are in mirror symmetry relative to the middle diameter line, and the grease injection holes 18 are communicated to the annular grease cavity 4 through the grease injection channel 12.
In order to further optimize the scheme, the monitoring sensors 2 are multiple, the monitoring sensors 2 are uniformly arranged in an annular equal included angle mode, and the point position real-time monitoring and the multi-point position real-time synchronous monitoring are achieved.
Wherein, the two shield tail brushes that are located foremost are detachable, and other shield tail brushes are welded fastening, are welded type shield tail brush 5. The two shield tail brushes at the forefront are a first shield tail brush 13 and a second shield tail brush 14 in sequence from front to back, namely the first shield tail brush 13 and the second shield tail brush 14 are detachable shield tail brushes,
the minimum angle between one monitoring sensor 2 on the first shield tail brush 13 and one monitoring sensor 2 on the second shield tail brush 14 in the circumferential direction is 22.5 degrees,
the monitoring sensors 2 on the first shield tail brush 13 and the monitoring sensors 2 on the second shield tail brush 14 divide the shield tail brush into 16 areas on the cross section for real-time monitoring, as shown in fig. 3, fig. 3 is a combination schematic diagram of the arrangement positions of the monitoring sensors of the first shield tail brush and the second shield tail brush 14, that is, for the convenience of understanding, the monitoring sensors 2 on the first shield tail brush 13 and the second shield tail brush 14 are superposed on a diagram to form an included angle of 22.5 °, where the minimum included angle is 22.5 °, that is, on the superposed diagram, an included angle between one monitoring sensor 2 on the first shield tail brush 13 and one monitoring sensor 2 on the second shield tail brush 14 closest to the former is 22.5 °, the identification position aligned by the diameter line in fig. 2 is the monitoring sensor arrangement position 15 on the first shield tail brush, the identification position not aligned by the diameter line in fig. 2 is the monitoring sensor arrangement position 16 on the second shield tail brush, it can be seen that the two sensors are arranged at intervals, that is, a monitoring sensor arrangement point 16 on the second shield tail brush is arranged between the monitoring sensor arrangement points 15 on the two first shield tail brushes, a monitoring sensor arrangement point 15 on the first shield tail brush is arranged between the monitoring sensor arrangement points 16 on the two second shield tail brushes, and it can be seen on the coincidence diagram that the monitoring sensor arrangement points 15 on the first shield tail brush and the monitoring sensor arrangement points 16 on the second shield tail brush equally divide the shield tail brushes into 16 regions on the cross section.
In order to further optimize the above scheme, the number of the pressure sensors 3 is multiple, the pressure sensors 3 are uniformly arranged in an annular shape with equal included angles, so that the point location real-time monitoring and the multi-point real-time synchronous monitoring are realized, as shown in fig. 4, in 8 regions equally divided by four diameter lines, each region is provided with one pressure sensor arrangement point location 17 for fixing the pressure sensors 3.
The embodiment of the invention also provides a shield tail brush dynamic sealing performance monitoring and controlling method, based on any one of the shield tunneling machine, which comprises the following steps:
step 1) the shield machine 8 normally tunnels, the pressure sensor 3 detects the pressure value P of the annular grease cavity 4 at the point position in real time and transmits the pressure value P to the control device 7 uninterruptedly,
the monitoring sensor 2 detects the abrasion amount lambda and the deformation amount delta of the tail brush of the shield at the point position in real time and transmits the abrasion amount lambda and the deformation amount delta to the control device 7 continuously;
step 2) the control device 7 compares the pressure value P with a preset pressure value P0, when P is more than or equal to P0, the grease in the point where the annular grease cavity 4 is located is in a saturated state,
when P is less than P0, the grease in the ring-shaped grease cavity 4 is not filled at the point, the control device 7 sends out a grease injection command until P is more than or equal to P0 to stop grease injection,
the control device 7 compares the wear amount lambda and the deformation amount delta with the preset wear amount lambda 0 and the preset deformation amount delta 0 respectively, when lambda is less than lambda 0 and delta is less than delta 0, the point where the shield tail brush 1 is located has no problem,
when lambda is less than lambda 0 and delta is more than or equal to delta 0, the shield tail brush 1 is in an overcompressed state at the point position, the control device 7 controls the shield tunneling machine 8 to adjust the posture until lambda is less than lambda 0 and delta is less than delta 0,
when the lambda is more than or equal to lambda 0, grease is injected or the shield tail brush 1 is replaced.
Specifically, the step 2) is specifically that,
if the control device 7 controls the shield tunneling machine 8 to adjust the posture so as not to realize lambda < lambda 0 and delta < delta 0, the posture can be limited to be not realized within a certain time, the specific time is set according to the actual situation, the number K of the monitoring sensors 2 measuring delta > delta 0 is compared with the preset number K0, grease is injected when K is less than K0, and the shield tail brush 1 is replaced when K is more than K0.
Specifically, the step 2) is specifically that,
when the lambda is larger than or equal to the lambda 0, comparing the number M of the monitoring sensors 2 with the preset number M0, wherein the measured lambda is larger than or equal to the lambda 0, injecting grease when the M is smaller than M0, and replacing the shield tail brush 1 when the M is larger than or equal to M0.
Specifically, the control device 7 displays the values, the comparison results and the action instructions of the pressure sensor 3 and the monitoring sensor 2 on a circular display panel according to the positions of the values and the comparison results on the cross section of the shield tunneling machine 8, and the display panel is provided with a flashing indicator light which gives an alarm corresponding to the monitoring sensor 2. As shown in fig. 5 and 6, the control device 7 is provided with a shield tail pressure monitoring display panel, namely a pressure sensor display panel, and a shield tail brush wear monitoring display panel, namely a monitoring sensor display panel, which can respectively display the pressure and wear monitoring point states in real time.
As shown in fig. 5, the circular cross section of the shield machine 8 corresponds to the circular cross section of the shield machine 8, and the positions of the marks Y1, Y2, Y3 and YN correspond to the positions of the pressure sensor 3 on the circular cross section of the shield machine 8, so that the display is more intuitive, and a pressure monitoring point N, a set value P0, an actual measurement value PN and a comparison result are displayed in a small area near each YN position. As shown in fig. 6, the circle corresponds to the circular cross section of the shield machine 8, the positions of the markers MX1, MX2, MX3 up to MXN correspond to the positions of the monitoring sensor 2 on the circular cross section of the shield machine 8, the display is more intuitive, and a small area beside each MXN position displays a wear/deformation monitoring point N, set values λ 0 and δ 0, actual measured values λ N and δ N, and the comparison result. And two flashing indicator lamps are arranged beside each MXN position, namely a flashing red lamp and a flashing yellow lamp, the red flashing point digit M, the system preset point digit M0 and a comparison result are displayed above the middle area, and the yellow flashing point digit K, the system preset point digit K0 and a comparison result are displayed below the middle area.
According to the shield machine and the shield tail brush dynamic sealing performance monitoring control method thereof provided by the embodiment of the invention, a plurality of shield tail sealing brushes arranged on the inner wall of the shield tail of a shield machine 8 are used, an annular grease cavity 4 is formed between a front shield tail brush and a rear shield tail brush 1, a built-in pressure sensor 3 is arranged on the inner wall of the shield tail of each annular grease cavity 4, monitoring sensors 2 are arranged on two detachable shield tail brushes according to the number of monitoring points, all the sensors are directly connected with a control device 7 in a shield machine main control room 10 by adopting communication cables 6, specifically, the head ends of the communication cables 6 are respectively connected with the monitoring sensors 2 and the pressure sensors 3, and the tail ends of the communication cables are connected with the control device 7. The information fed back by the sensor is received and analyzed by the control device 7, the real-time condition at the monitoring point is displayed, and the shield machine 8 is adjusted and processed in a targeted manner according to the display result. The control device 7 controls the regulating system.
Wherein, removable shield tail brush links firmly through bolt and shield tail inner wall, welded type shield tail brush 5 is direct and the internal welded fastening of shield, and 4 intervals in the annular grease chamber between every adjacent two shield tail brushes 1 are the same around, and every annular grease chamber 4 sets up a plurality of notes fat points along circumference, annotates fat hole 18 promptly, and the biggest L of single chamber single pump control grease injection volume and every adjacent two points along circumference arc length interval is not more than 2.5m, as shown in fig. 4.
As shown in fig. 3, the monitoring sensor 2 can be distributed in the setting position of the detachable shield tail brush according to the number of actual monitoring points along the circumferential direction of the shield tail in a shape like a Chinese character 'mi', and the first annular detachable shield tail brush, namely the first shield tail brush 13, and the second annular detachable shield tail brush, namely the second shield tail brush 14, are distributed in a shape like a Chinese character 'mi' along the circumferential direction between two adjacent monitoring points. The first shield tail brush 13 and the second shield tail brush 14 are uniformly distributed along the circumferential direction to divide the two detachable shield tail brushes into 16 regions for real-time monitoring.
The pressure sensors 3 are built-in pressure sensors, are uniformly distributed in the shield tail inner wall of the annular grease cavity 4 along the annular direction, and carry out real-time multipoint monitoring on the pressure value in the annular grease cavity 4.
Specifically, on the different monitoring point positions of each detachable shield tail brush along the annular direction, the abrasion loss lambda 0 and the deformation delta 0 set by the system are set according to the requirements of actual working conditions. At different monitoring points in each annular grease chamber 4, a system pressure set value P0 is set according to actual working conditions. And on the same annular monitoring point position in different annular grease cavities 4, a system pressure set value P0 is set according to actual working conditions. And each pressure monitoring point position is adjacent to a grease area containing at least one grease injection point position, and the grease injection amount of the grease area is adjusted in a targeted manner through the control device 7.
In the shield tail brush dynamic sealing performance monitoring control method provided by the embodiment of the invention, during actual operation, the pressure monitoring of the annular grease cavity 4 comprises the following steps:
firstly, normally tunneling a shield machine 8, detecting the pressure value of an annular grease cavity 4 at the point position in real time by each pressure sensor 3, and continuously transmitting the pressure value to a control device 7 in a digital signal form through a communication cable 6;
the control device 7 rapidly analyzes and processes the signals after receiving the signals, calculates the actual pressure value P of the signal transmitting point, compares the actual pressure value P with a preset pressure value P0 in the system, and displays the test value and the comparison result on a pressure monitoring display panel;
the comparison result obtained in the second step is as follows: if P is larger than or equal to P0, and the grease at the monitoring point position of the annular grease cavity 4 is in a saturated state at the moment, the control device 7 sends a command of stopping the injection of the grease to the corresponding grease injection system, and the grease injection pump stops working;
if P is less than P0, at the moment, grease at the monitoring point of the annular grease cavity 4 is in an unfilled state, the control device 7 sends a grease injection instruction to the corresponding grease injection system, the corresponding grease region grease injection pump starts to work, and the grease injection pump stops working until P is greater than or equal to P0 according to the comparison result of the monitoring point.
The wear monitoring of the detachable shield tail brush comprises the following steps:
firstly, the shield machine 8 normally tunnels, each monitoring sensor 2 detects the abrasion and deformation conditions of the detachable shield tail brush at the point position in real time, and the abrasion and deformation conditions are transmitted to the control device 7 through the communication cable 6 uninterruptedly in a digital signal form;
the control device 7 rapidly analyzes and processes the signals after receiving the signals, calculates the actual abrasion amount lambda and the deformation amount delta of the signal transmitting point, compares the actual abrasion amount lambda 0 and the deformation amount delta 0 with the abrasion amount lambda 0 and the deformation amount delta 0 which are preset in the system, and displays the measured value and the comparison result on an abrasion monitoring display panel;
the comparison result obtained in the second step is as follows: if lambda is less than lambda 0 and delta is less than delta 0, the state of the detachable shield tail brush on the monitoring point position is good at the moment, and the flicker indicator lamp does not display, the control device 7 sends a normal propulsion instruction to the corresponding propulsion system, the shield posture is good, and the detachable shield tail brush does not need to be replaced;
if lambda is less than lambda 0 and delta is more than or equal to delta 0, the detachable shield tail brush on the monitoring point location is in an overcompressed state at the moment, and the flashing yellow lamp of the corresponding point location shows a high-brightness yellow flashing state, the control device 7 sends out an extending instruction to the propulsion system of the corresponding area to adjust the shield posture until the comparison result of the monitoring point shows that lambda is less than lambda 0 and delta is less than delta 0 again, and the flashing yellow lamp is turned off;
if no matter how the shield posture is adjusted, the comparison result always shows that delta is larger than or equal to delta 0, a certain time can be limited, and a bright yellow flashing state continuously exists, the detachable shield tail brush on the monitoring point position can be permanently deformed or crushed, at the moment, when the number K of the points, which is larger than or equal to delta 0, of the comparison result is smaller than the preset number K0 of the system, the grease injection amount of the points is manually controlled to seal, and when the number K of the points, which is larger than or equal to delta 0, of the comparison result is larger than or equal to the preset number K0 of the system, a shield tail brush replacement instruction appears on the wear monitoring display panel, and at the moment, the shield tail brush 1 replacement planning operation state is required to be rapidly entered, and preparation is made in advance for the replacement operation of the shield tail brush 1;
if lambda is larger than or equal to lambda 0, the corresponding monitoring point position on the wear monitoring display panel shows a highlight red flashing state and gives out a corresponding alarm sound, wherein when the number M of highlight red flashing points is smaller than the number M0 of preset point positions of the system, the grease injection amount of the point position is manually controlled to seal, when the number M of highlight red flashing points is larger than or equal to the number M0 of the preset point positions of the system, a command for replacing the shield tail brush 1 appears on the wear monitoring display panel, at the moment, the shield tail brush 1 needs to enter a replacement planning operation state rapidly, and preparation is made in advance for replacement operation of the shield tail brush 1.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A shield machine is characterized in that a pressure sensor is arranged in the annular grease cavity, and the two shield tail brushes positioned at the forefront are provided with monitoring sensors for monitoring abrasion loss and deformation quantity;
the pressure sensor and the monitoring sensor are in signal connection with a control device, when the shield tunneling machine normally tunnels, the pressure sensor detects the pressure value P of the annular grease cavity on the point where the pressure sensor is located in real time and transmits the pressure value P to the control device continuously, and the monitoring sensor detects the abrasion amount lambda and the deformation amount delta of the shield tail brush on the point where the pressure sensor is located in real time and transmits the abrasion amount lambda and the deformation amount delta to the control device continuously;
the control device compares the pressure value P with a preset pressure value P0, and when P is larger than or equal to P0, the grease in the point position where the annular grease cavity is located is in a saturated state; when P is less than P0, grease in the ring-shaped grease cavity at the point position is in an unfilled state, and the control device sends a grease injection instruction until P is more than or equal to P0 and stops grease injection;
the control device respectively compares the wear amount lambda and the deformation amount delta with a preset wear amount lambda 0 and a preset deformation amount delta 0, and when lambda is smaller than lambda 0 and delta is smaller than delta 0, the point position where the shield tail brush is located has no problem; when lambda is larger than lambda 0 and delta is larger than or equal to delta 0, the shield tail brush is in an over-compression state at the point position, and the control device controls the shield tunneling machine to adjust the posture until lambda is larger than lambda 0 and delta is larger than delta 0; and when the lambda is more than or equal to lambda 0, injecting grease or replacing the shield tail brush.
2. The shield tunneling machine of claim 1, wherein the two foremost shield tail brushes are detachable, and the rest of the shield tail brushes are welded and fixed.
3. The shield tunneling machine of claim 1, wherein the annular grease cavity is of equal width,
annular grease chamber is provided with a plurality of notes fat holes along circumference, adopt single chamber single pump with annotate fat hole intercommunication control grease volume of living, adjacent two the arc length interval along circumference between the notes fat hole is not more than 2.5 m.
4. The shield tunneling machine of claim 1, wherein the number of the monitoring sensors is multiple, and the monitoring sensors are uniformly arranged in an annular shape with equal included angles.
5. The shield tunneling machine of claim 4, wherein the two foremost shield tail brushes are a first shield tail brush and a second shield tail brush from front to back,
the minimum included angle between the monitoring sensor on the first shield tail brush and the monitoring sensor on the second shield tail brush in the circumferential direction is 22.5 degrees,
the monitoring sensor on the first shield tail brush and the monitoring sensor on the second shield tail brush equally divide the shield tail brush into 16 areas on the cross section for real-time monitoring.
6. The shield tunneling machine of claim 1, wherein the number of the pressure sensors is multiple, and the pressure sensors are uniformly arranged in an annular shape with equal included angles.
7. A shield tail brush dynamic sealing performance monitoring control method is characterized in that the shield machine based on any one of the claims 1-6 comprises the following steps:
step 1) normally tunneling by the shield machine, detecting the pressure value P of the annular grease cavity on the point position in real time by the pressure sensor and continuously transmitting the pressure value P to the control device,
the monitoring sensor detects the abrasion amount lambda and the deformation amount delta of the shield tail brush at the point position in real time and transmits the abrasion amount lambda and the deformation amount delta to the control device continuously;
step 2) the control device compares the pressure value P with a preset pressure value P0, when P is larger than or equal to P0, grease in the annular grease cavity is in a saturated state at the point position,
when P is less than P0, the grease in the ring-shaped grease cavity at the point position is in an unfilled state, the control device sends out a grease injection instruction until P is more than or equal to P0 to stop grease injection,
the control device compares the wear amount lambda and the deformation amount delta with a preset wear amount lambda 0 and a preset deformation amount delta 0 respectively, when lambda is less than lambda 0 and delta is less than delta 0, the point where the shield tail brush is located has no problem,
when lambda is less than lambda 0 and delta is more than or equal to delta 0, the point where the shield tail brush is located is in an over-compression state, the control device controls the shield tunneling machine to adjust the posture until lambda is less than lambda 0 and delta is less than delta 0,
and when the lambda is more than or equal to lambda 0, injecting grease or replacing the shield tail brush.
8. The shield tail brush dynamic sealing performance monitoring and controlling method according to claim 7, wherein the step 2) is specifically,
if the control device controls the shield tunneling machine to adjust the posture and cannot realize that lambda is larger than lambda 0 and delta is smaller than delta 0, comparing the number K of the monitoring sensors for measuring delta to be larger than or equal to delta 0 with the preset number K0, injecting grease when K is larger than K0, and replacing the shield tail brush when K is larger than or equal to K0.
9. The shield tail brush dynamic sealing performance monitoring and controlling method according to claim 7, wherein the step 2) is specifically,
when the lambda is larger than or equal to lambda 0, comparing the number M of the monitoring sensors with the preset number M0, wherein the number M of the monitoring sensors is larger than or equal to lambda 0, injecting grease when the number M is smaller than M0, and replacing the shield tail brush when the number M is larger than or equal to M0.
10. The shield tail brush dynamic sealing performance monitoring and controlling method according to claim 7, wherein the control device displays the values of the pressure sensor and the monitoring sensor, the compared result and the action command on a circular display panel according to the corresponding positions of the values on the cross section of the shield tunneling machine,
and a flashing indicator light which gives an alarm corresponding to the monitoring sensor is arranged on the display panel.
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| CN114061925A (en) * | 2021-11-01 | 2022-02-18 | 中铁工程装备集团有限公司 | Online monitoring method for abrasion loss of sealing brush in shield tail sealing system |
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