CN114033399B - Intelligent monitoring system for synchronous grouting of subway tunnel shield - Google Patents
Intelligent monitoring system for synchronous grouting of subway tunnel shield Download PDFInfo
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- CN114033399B CN114033399B CN202111360318.7A CN202111360318A CN114033399B CN 114033399 B CN114033399 B CN 114033399B CN 202111360318 A CN202111360318 A CN 202111360318A CN 114033399 B CN114033399 B CN 114033399B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 93
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 238000009825 accumulation Methods 0.000 claims description 10
- 230000003993 interaction Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 14
- 230000002159 abnormal effect Effects 0.000 description 8
- 238000009530 blood pressure measurement Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000003814 drug Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
- E21D9/0609—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering with means for applying a continuous liner, e.g. sheets of plastics, between the main concrete lining and the rock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The intelligent monitoring system for synchronous grouting of the tunnel shield is characterized in that a synchronous grouting system of the tunnel shield is modified, and a branch pipe flowmeter set, a ball valve set and an emergency switching block device are sequentially arranged between an output port of a grouting pump and a shield tail according to a spatial relationship; the grouting liquid outlet, the branch pipe flowmeter, the ball valve, the emergency block-changing device and the grouting port of the shield tail are sequentially connected in series to form a slurry conveying path; the branch pipe flowmeter can accurately monitor the slurry consumption of the slurry conveying path in real time; after the pipeline or pump fails, the grouting path is switched to the slurry conveying path through the emergency switching block device to achieve logic judgment so as to achieve positioning of the failure point, and meanwhile, the system is ensured to keep synchronous grouting in real time under the condition of pump failure so as to control site engineering safety. The invention provides reliable data support and effective emergency treatment convenience for the construction of the subway tunnel shield machine.
Description
[ field of technology ]
The invention relates to the intelligent monitoring field of synchronous grouting of tunnel shield; specifically, the system provides a flow pressure monitoring and emergency control function for a subway tunnel shield synchronous grouting system. The system applies the differential pressure measurement technology to the measurement and calculation of the accumulated quantity of the shield synchronous grouting system for the first time, and is a brand new measurement device designed for effectively adapting to high-solid particle slurry for subway tunnel construction; meanwhile, the system organically combines flow pressure monitoring, fault judgment and emergency treatment to cope with the situation that the synchronous grouting system breaks down in the shield construction process, so that the normal work of the synchronous grouting system of the shield is continuously maintained.
[ background Art ]
Currently, the accumulated amount measuring method of the subway tunnel shield synchronous grouting system is that the calculated amount is obtained by counting the stroke times of a grouting pump and multiplying the stroke times by the theoretical amount of a single stroke; the final measuring and calculating result and the actual situation are far from each other because of the large error between the theoretical square quantity of the single stroke and the actual square quantity of the single stroke; on the other hand, a general flowmeter cannot adapt to a high-solid particle slurry (containing a large amount of sand grains) medium used by a shield synchronous grouting system, so that the high-solid particle slurry is very easy to damage, and a method capable of accurately and effectively measuring and calculating the accumulation amount of the synchronous grouting system is urgently needed for a subway tunnel shield.
The subway tunnel shield is generally provided with 2 grouting pumps, each grouting pump is provided with 2 grouting outlets, and thus, the 4 grouting outlets are respectively connected to 4 synchronous grouting outlets at the tail of a main machine of the shield machine, and the 4 grouting outlets at the tail of the shield machine are distributed at the upper left and the upper right, and the lower left and the lower right of the shield body. In the construction process, the high-solid particle slurry for the tunnel injected by the grouting system can cause slurry pipe blockage, and the grouting pump also fails due to abrasion and corrosion of the slurry to the grouting pump, once the conditions are met, the shield machine control system can not give an alarm and prompt in time, and workers are required to check and find on site, so that inconvenience is brought to construction production.
After the grouting pump works for a period of time, the conditions of easy damage part replacement, fault removal and the like can occur, when a certain grouting pump fails, the repair is not realistic soon, and in order to meet the normal propulsion requirement of the shield machine, the operation of the synchronous grouting system is reasonably selected by temporarily using one grouting pump without the fault. In general, a synchronous grouting system is temporarily carried out by using one grouting pump without faults, the shield machine needs to be stopped for pushing, the grouting pump needs to be stopped for working, a pipeline between the grouting pump and a grouting port is disassembled, and then the grouting pump is rearranged, so that a great deal of time is required to be spent, and the construction is influenced. If the shield machine is under a special working condition, for example, an important building exists above a tunnel being constructed, or the shield machine is crossing the tunnel at a short distance, the shield machine can not be stopped for a long time, otherwise, construction risks are brought.
The invention is designed for solving the practical construction difficulty and trouble.
[ invention ]
In order to overcome the defects of the prior art, the purpose of the application is to provide an intelligent monitoring system and method for synchronous grouting of a tunnel shield, which are used for shield grouting, accurately measuring the accumulated quantity of grouting, automatically judging and analyzing the cause of faults of the synchronous grouting system of the shield, effectively assisting the pushing construction of a shield machine and reducing the construction risk.
The technical scheme of the application is as follows:
the intelligent monitoring system comprises a synchronous grouting system of the tunnel shield, wherein the synchronous grouting system of the tunnel shield is distributed on a shield tail and a trolley, a left upper grouting port, a right upper grouting port, a left lower grouting port, a right lower grouting port and matched grouting port ball valve groups (QW 1, QW2, QW3 and QW 4) are arranged at the shield tail, two grouting pumps (1 # grouting pump and 2# grouting pump) are arranged on the trolley, each grouting pump provides two grouting liquid output ports, and four grouting liquid output ports are provided in total;
the system also comprises a PLC control system in the operation room;
the synchronous grouting system of the tunnel shield is modified, and a branch pipe flowmeter set, a ball valve set and an emergency switching block device are sequentially arranged between an output port of a grouting pump and a shield tail according to a spatial relationship; the branched pipe flowmeter group comprises four branched pipe flowmeters; the ball valve group comprises four ball valves; the emergency switching block device is provided with four inlets and four outlets, so that four grouting liquid output ports, four branch pipe flow meters, four ball valves, the emergency switching block device and four grouting ports at the tail of the shield are sequentially connected in series to form four slurry conveying paths; a pressure sensor is designed in the structure of the branched pipe flowmeter;
the system comprises a pipeline or pump, an emergency switching block device, a grouting path, a control system and a control system, wherein the pipeline or pump is in fault, and then the emergency switching block device switches the slurry conveying path to complete logic judgment so as to realize the positioning of fault points;
the branch pipe flowmeter can accurately monitor the slurry consumption of the slurry conveying path in real time;
the PLC control system comprises a slurry consumption calculation module, a fault monitoring judgment module and a man-machine interaction module;
the input of the PLC control system is connected with the branch pipe flowmeter to obtain the pressure of the conveying slurry path in real time; the slurry consumption calculation module calculates and obtains the slurry consumption on the branch according to the pressure of the slurry conveying path, obtains the slurry consumption sum after four paths of addition and accumulation time, provides the slurry consumption sum for the fault monitoring and judging module to analyze, and displays the result in the man-machine interaction module;
the output of the PLC control system is connected with the emergency switching block device, and the PLC control system is matched with the fault monitoring judgment and the man-machine interaction module to help the staff judge and confirm the condition of the tunnel shield synchronous grouting system.
The inlet end of the emergency switching block device is connected with four ball valves; the four ball valves are respectively an upper left ball valve (Q1), an upper right ball valve (Q2), a lower left ball valve (Q3) and a lower right ball valve (Q4), and are all manual ball valves; the four branch pipe flow meters are respectively an upper left branch pipe flow meter (A1), an upper right branch pipe flow meter (A2), a lower left branch pipe flow meter (A3) and a lower right branch pipe flow meter (A4); the left upper grouting liquid input port and the right upper grouting liquid input port are communicated with a No.1 grouting pump; the left lower grouting liquid inlet and the right lower grouting liquid inlet are communicated with a No.2 grouting pump; the emergency switching block device comprises a left switching block and a right switching block which are not communicated with each other;
taking a left side switching block as an example;
the switching block comprises two grouting pipes which are horizontally parallel up and down, two inlets, two grouting pipes which are obliquely parallel up and down, two outlets and two pneumatic switching plugs;
the two pneumatic switching plugs are specifically an upper left pneumatic switching plug (1#) and a lower left pneumatic switching plug 3#) and can be respectively arranged in the upper left through hole 331) and the lower left through hole 333; upper left through holes 331) are arranged on the upper horizontal grouting pipes, and the upper left through holes 331) are positioned between the two inclined grouting pipes; a left lower through hole 333) is arranged on the inclined upper grouting pipe, and the left lower through hole 333) is positioned between the two horizontal grouting pipes;
when the two pneumatic switching plugs (1#, 3#) are closed, the inlet of the upper left grouting pipe and the inlet of the lower left grouting pipe flow out from the upper left grouting liquid outlet and the lower left grouting liquid outlet respectively;
when the left upper pneumatic switching plug 1# is opened, the slurry at the inlet of the left upper grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
when the left lower pneumatic switching plug (3#) is opened, the slurry at the inlet of the left lower grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
the right side switching block is provided with a corresponding right upper pneumatic switching plug (2#) and a right lower pneumatic switching plug (4#) which can be respectively arranged on the right upper through hole (332) and the right lower through hole (334); the mechanism is the same as above;
thus, four inlets in the emergency switching block device: the left upper inlet, the right upper inlet, the left lower inlet and the right lower inlet are respectively and correspondingly connected with the left upper ball valve (Q1), the right upper ball valve (Q2), the left lower ball valve (Q3) and the right lower ball valve (Q4) in the four ball valves; four outlets in the emergency switching block device: the upper left grouting liquid outlet, the upper right grouting liquid outlet, the lower left grouting liquid outlet and the lower right grouting liquid outlet are respectively and correspondingly connected with the upper left grouting path (NO. 1), the upper right grouting path (NO. 2), the lower left grouting path (NO. 3) and the lower right grouting path (NO. 4).
The trolley is provided with two grouting pumps (grouting pump 1#, grouting pump 2#); the 1# grouting pump is provided with two grouting liquid output ports which are respectively connected with a left upper grouting inlet in the left switching block and a right upper grouting inlet in the right switching block; the No.2 grouting pump is provided with two grouting liquid output ports which are respectively connected with a left lower grouting inlet in the left switching block and a right lower grouting inlet in the right switching block.
The branch pipe flow measuring instruments are arranged on a conveying slurry path, each branch pipe flow measuring instrument comprises A, B two pressure measuring points, and two pressure sensors are respectively arranged at the two pressure measuring points;
the device also comprises a channel device, wherein a wedge block is arranged in the channel device, a non-homogeneous slurry fluid pressure field is formed in the channel device through the wedge block, and two pressure sensors are respectively arranged at the end sides of the channel device to obtain a pressure measurement value P A And P B And is provided for a PLC control system.
The slurry consumption calculation module algorithm is as follows:
step one: firstly, calculating the instantaneous flow value of the slurry of a single slurry conveying pipeline from a pressure measurement point B to a pressure measurement point A of a branch pipe flow meter:
wherein:
Q V flow from point B to point A, m 3 /s
-a constant flow-out;
-slurry swell value;
m-the ratio of the through pulp area,
S general purpose medicine Area of general flow of blood, m 2
S General purpose medicine Is calculated by (1):
r-the tube diameter, m;
Δp—pressure difference from measurement point a to measurement point B, pa;
rho-slurry density, kg/m 3 ；
h, the height of the slurry through hole, m;
step two: integrating the calculated instantaneous flow value from the branch pipe flow measuring instrument pressure point B to the pressure point A for the time t from the pressure point B to the pressure point A, and obtaining the volume V of the slurry from the pressure point B to the pressure point A;
step three: and accumulating the accumulated quantities of the 4 branch pipes to obtain the total accumulated quantity of grouting of the synchronous grouting system.
The tunnel shield synchronous grouting system comprises four branches: the 1# grouting pump injects slurry to the left upper slurry path (NO. 1) and the right upper slurry path (N0.2), and the 2# grouting pump injects slurry to the left lower slurry path (NO. 3) and the right lower slurry path (NO. 4);
the system faults are classified into a grouting pipe blocking fault or a grouting pump fault;
no matter which fault is detected, when any grouting pipeline of the grouting system is in fault, a branch pipe flow measuring instrument of the fault grouting pipeline measures that the flow value approaches to 0, the pressure value reaches a set upper limit ('abnormal'), and a human-computer interface operation panel in an operation chamber of the shield machine gives an 'abnormal' prompt;
taking the NO.1 slurry path in four paths as an example;
the working mechanism of the fault monitoring judgment and man-machine interaction module is as follows:
when the fault monitoring judgment and man-machine interaction module displays that the pressure value of the left upper slurry path (NO. 1) is higher than a preset value, the grouting pressure at the pressure measuring point B of the left upper slurry path (NO. 1) is abnormal, and the grouting accumulation amount of the left upper slurry path (NO. 1) is abnormal;
the staff timely turns off the 1# grouting pump and the 2# grouting pump, and turns off the two paths of upper left ball valves (Q1) and upper right ball valves (Q2) of the 1# grouting pump ports corresponding to the upper left grouting path (NO. 1), so that the 1# grouting pump and a system connecting path (isolating the 1# grouting pump) are cut off; simultaneously, the left lower grouting port ball valve (Q) at the tail part of the shield W3 ) Ball valve Q of right lower grouting port W4 ) Closing; meanwhile, an instruction of switching to 1-2 is executed by an emergency block switching device through an emergency switch in an operation panel, namely the PLC controls the left lower pneumatic switching plug 3# and the right lower pneumatic switching plug 4# to be pulled out;
restarting the 2# grouting pump (so, the normally working 2# grouting pump replaces the 1# grouting pump to grouting the No.1 and the No.2 grouting paths, namely grouting the left upper grouting port and the right upper grouting port), and observing:
if the fault monitoring judgment and man-machine interaction module displays that the pressure value of the left lower slurry path (NO. 3) is higher than a preset value, the grouting pressure at the pressure measuring point B of the left lower slurry path (NO. 3) is abnormal, and the grouting accumulation amount of the left lower slurry path (NO. 3) is abnormal; it can be finally judged that the left upper slurry path (No. 1) is blocked, and countermeasures are taken at the moment: timely adopting routine pipeline dredging measures in the field;
otherwise, if no abnormality exists, the upper left slurry path (NO. 1) can be judged to be capable of normally grouting, but the isolated 1# slurry pump fails; countermeasures at this time: reopening left lower grouting port ball valve Q at shield tail W3 ) Ball valve of right lower grouting port (Q) W4 ) After the adjustment, the 2# grouting pump independently supports synchronous grouting system work, grouting is carried out on 4 grouting openings at the tail of the shield, normal propulsion of the shield machine is maintained, overhaul time is obtained for the isolated 1# grouting pump, and the condition that engineering stops working is avoided.
The invention has the following beneficial effects:
reliable data support and effective emergency treatment convenience are provided for the construction of the subway tunnel shield machine, and the value of the device can be fully reflected along with being applied to more shield machines.
Drawings
FIG. 1 is a schematic diagram of grouting pipelines of a tunnel shield synchronous grouting intelligent monitoring system
FIG. 2 is a schematic diagram of grouting pipeline at shield tail of shield tunneling machine
FIG. 3 is a schematic main structure of the grouting system in the trolley part
FIG. 4 is an enlarged block diagram of portion B of FIG. 3
FIG. 5 is a schematic view of the internal structure of the portion B in FIG. 3
FIG. 6 is a left side switching block cross-sectional view
FIG. 7 is a schematic diagram of a flow meter for a branched pipe
FIG. 8 is a sectional view of a branched flow meter
FIG. 9 is a schematic view of an operation panel display screen shot
FIG. 10PLC controlled pneumatic switching plug flow chart
FIG. 11 is a flow chart for judging the failure of the NO.1 pipeline
Layout diagram of shield construction process device of FIG. 12 system
Digital annotation tags:
quick-switching block device 3, horizontal grouting pipe 31, inclined grouting pipe 32, upper left through hole 331, lower left through hole 333, upper right through hole 332, lower right through hole 334, ball valve group 2, leftThe upper ball valve Q1, the right upper ball valve Q2, the left lower ball valve Q3, the right lower ball valve Q4, the branch pipe flowmeter group 1, the left upper branch pipe flowmeter A1, the right upper branch pipe flowmeter A2, the left lower branch pipe flowmeter 3, the right lower branch pipe flowmeter A4, the left upper pneumatic switching plug 1#, the left lower pneumatic switching plug 3#, the right upper pneumatic switching plug 2#, the right lower pneumatic switching plug 4#, the left upper grouting port ball valve Q W1 Ball valve Q of upper right grouting port W2 Ball valve Q with left lower grouting port W3 Ball valve Q of right lower grouting port W4 。
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples. The technical scheme principle of the invention is illustrated by taking a shield machine with two pumps as an example.
As shown in fig. 1, 3 and 12, the main design structure is:
the area A is a shield tail schematic diagram of the shield tunneling machine, and comprises a left upper grouting port, a right upper grouting port, a left lower grouting port and a right lower grouting port, wherein each grouting port is provided with a manual ball valve.
As shown in fig. 4, the area B is the emergency switching device 3, the ball valve group 2 and the branch pipe flowmeter group 1 designed in the application.
The region C is two grouting pumps on a 1# trolley of the shield tunneling machine, and the two grouting pumps are respectively numbered as a 1# grouting pump and a 2# grouting pump, which are the prior art.
The structure shown in the area A is arranged at the tail of the shield machine, and the structure shown in the area B, C is arranged in a trolley area of the shield system.
As shown in fig. 2, the shield tail of the shield tunneling machine mainly comprises 4 shield tail grouting openings and 4 standby grouting openings, and when the pipeline is blocked, the problems of pipeline replacement, pipeline connection to the standby grouting openings and the like can be solved according to the conditions.
As shown in fig. 5, the four branch pipe flowmeters, the four ball valves and the emergency switching block device are sequentially connected in series; the four ball valves are respectively an upper left ball valve Q1, an upper right ball valve Q2, a lower left ball valve Q3 and a lower right ball valve Q4, and are all manual ball valves; the four branch pipe flow meters are respectively an upper left branch pipe flow meter A1, an upper right branch pipe flow meter A2, a lower left branch pipe flow meter A3 and a lower right branch pipe flow meter A4, and respectively correspond to four grouting liquid input ports; the four grouting liquid inlets comprise a left upper grouting liquid inlet, a left lower grouting liquid inlet, a right upper grouting liquid inlet and a right lower grouting liquid inlet, wherein the left upper grouting liquid inlet and the right upper grouting liquid inlet are communicated with a grouting pump 1# and the left lower grouting liquid inlet and the right lower grouting liquid inlet are communicated with a grouting pump 2 #; the emergency switching block device comprises a left switching block and a right switching block which are arranged in parallel and are not communicated with each other; as shown in fig. 7 and 8, each of the branched pipe flow measuring instruments is provided with a group of pressure measuring points a and B, and each pressure measuring point is provided with a pressure sensor; the pneumatic switching plug is controlled by a cylinder. The lower part of the branch pipe flow measuring instrument is provided with an equipment rack, and the upper part of the branch pipe flow measuring instrument is provided with a protective cover plate.
As shown in fig. 6, the switching block comprises two grouting pipes horizontally parallel up and down and two inlets, two grouting pipes obliquely parallel up and down and two outlets, and two pneumatic switching plugs;
the two pneumatic switching plugs, specifically an upper left pneumatic switching plug 1#, a lower left pneumatic switching plug 3#, can be respectively installed in the upper left through hole 331 and the lower left through hole 333; the horizontal upper grouting pipe is provided with a left upper through hole 331, and the left upper through hole 331 is positioned between the two inclined grouting pipes; a left lower through hole 333 is arranged on the inclined upper grouting pipe, and the left lower through hole 333 is positioned between the two horizontal grouting pipes;
when the two pneumatic switching plugs (1#, 3#) are closed, the inlet of the upper left grouting pipe and the inlet of the lower left grouting pipe flow out from the upper left grouting liquid outlet and the lower left grouting liquid outlet respectively;
when the left upper pneumatic switching plug 1# is opened, the slurry at the inlet of the left upper grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
when the left lower pneumatic switching plug 3# is opened, the slurry at the inlet of the left lower grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
the right side switching block is provided with a corresponding right upper pneumatic switching plug 2# and a right lower pneumatic switching plug 4# in the same way, and can be respectively arranged in the right upper through hole 332 and the right lower through hole 334; the mechanism is the same as above;
thus, under normal conditions, when the left emergency switching block device and the right emergency switching block device work, the left upper grouting pipe inlet, the left lower grouting pipe inlet, the right upper grouting pipe inlet and the right lower grouting pipe inlet respectively flow out from the left upper grouting liquid outlet, the left lower grouting liquid outlet, the right upper grouting liquid outlet and the right lower grouting liquid outlet;
when the upper left pneumatic switching plug 1# and the upper right pneumatic switching plug 2# are simultaneously opened, the slurry at the inlet of the upper left grouting pipe flows out from the upper left grouting liquid outlet and the lower left grouting liquid outlet simultaneously; simultaneously, the slurry at the inlet of the upper right grouting pipe flows out from the upper right grouting liquid outlet and the lower right grouting liquid outlet simultaneously;
when the left lower pneumatic switching plug 3# and the right lower pneumatic switching plug 4# are simultaneously opened, the slurry at the inlet of the left lower grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously; simultaneously, the slurry at the inlet of the right lower grouting pipe flows out from the right upper grouting liquid outlet and the right lower grouting liquid outlet simultaneously;
thus, four inlets in the emergency switching block device: the left upper inlet, the right upper inlet, the left lower inlet and the right lower inlet are respectively correspondingly connected with the left upper ball valve Q1, the right upper ball valve Q2, the left lower ball valve Q3 and the right lower ball valve Q4 in the four ball valves; four outlets in the emergency switching block device: the upper left grouting liquid outlet, the upper right grouting liquid outlet, the lower left grouting liquid outlet and the lower right grouting liquid outlet are respectively and correspondingly connected with the upper left grouting path NO.1, the upper right grouting path NO.2, the lower left grouting path NO.3 and the lower right grouting path NO. 4.
Synchronous grouting system accumulation measuring working principle:
each branch pipe flow measuring instrument is connected with a grouting liquid output port of the grouting pump, and the grouting liquid passes through a branch pipe flow measuring instrument pressure measuring point B and a pressure measuring point A, and a pressure sensor is respectively arranged at two positions of A, B to measure the pressure P A And P B The flow of slurry from the branch pipe flow measuring instrument pressure point B to the pressure point A can be calculated by the system through the following calculation:
the slurry consumption calculation module algorithm is as follows:
step one: firstly, calculating the instantaneous flow value of the slurry of a single slurry conveying pipeline from a pressure measurement point B to a pressure measurement point A of a branch pipe flow meter:
wherein:
Q V flow from point B to point A, m 3 /s
-a constant flow-out;
-slurry swell value;
m-the ratio of the through pulp area,
S general purpose medicine Area of general flow of blood, m 2
S General purpose medicine Is calculated by (1):
r-the tube diameter, m;
Δp—pressure difference from measurement point a to measurement point B, pa;
rho-slurry density, kg/m 3 ；
h, the height of the slurry through hole, m;
step two: integrating the calculated instantaneous flow value from the branch pipe flow measuring instrument pressure point B to the pressure point A for the time t from the pressure point B to the pressure point A, and obtaining the volume V of the slurry from the pressure point B to the pressure point A;
step three: and accumulating the accumulated quantities of the 4 branch pipes to obtain the total accumulated quantity of grouting of the synchronous grouting system. The PLC control system displays the instant pressure, the pipe separation accumulation amount and the total accumulation amount of system grouting of each pipe separation pressure measurement point A and pressure measurement point B on an operation panel of a main control room of the shield machine, and provides important reference data for site construction.
The fault judging and disposing method of the synchronous grouting system comprises the following steps:
as shown in fig. 9, in a normal condition, when the left emergency switching block device and the right emergency switching block device work, the left upper grouting pipe inlet, the left lower grouting pipe inlet, the right upper grouting pipe inlet and the right lower grouting pipe inlet flow out from the left upper grouting liquid outlet, the left lower grouting liquid outlet, the right upper grouting liquid outlet and the right lower grouting liquid outlet respectively;
when the grouting system is in fault (such as the grouting pipe is blocked or the grouting pump is in fault), the flow value measured by the branch pipe flow measuring instrument of the fault slurry path is approaching to 0, the pressure value reaches the set upper limit, the abnormal grouting system alarm lamp of the operation panel in the operation chamber of the shield machine will flash in red, and the flow, the pressure display frame and the number corresponding to the fault slurry path will flash in red.
For example, when the system detects that the pressure value of the No.1 slurry path is higher than a preset value, a red flicker appears on an operating room interface grouting system abnormality alarm lamp, a grouting pressure display frame and a digital red flicker appear at a No.1 slurry path pressure measuring point B, and a grouting accumulation amount display frame and a digital red flicker appear on the No.1 slurry path.
At the moment, the grouting system is stopped to run in time (two pumps are closed at the same time), a left upper ball valve Q1 and a right upper ball valve Q2 of a 1# grouting pump port corresponding to a NO.1 slurry path are closed, and a connection path between the 1# grouting pump and the system is cut off; simultaneously, the left lower grouting port ball valve Q at the tail part of the shield W3 Ball valve Q of right lower grouting port W4 When the switch is closed and the safety is ensured, an emergency change-over switch is used in the operation panel, the switch is turned to '1-2', and the system automatically controls the action of a pneumatic change-over plug.
The 2# grouting pump is restarted.
Through the series of operations, the 2# grouting pump which is operated normally before is used for grouting (namely grouting to the No.1 and No.2 grouting paths) on the left upper grouting port and the right upper grouting port instead of the 1# grouting pump.
If the system detects that the pressure value of the No.3 slurry path is higher than the preset value, a red flicker appears on an abnormal alarm lamp of the grouting system at the interface of the operation room, a grouting pressure display frame and a digital red flicker appear at a pressure measuring point B of the No.3 slurry path, a grouting accumulation amount display frame and a digital red flicker appear on the No.3 slurry path, and the situation that the original No.1 slurry path is blocked can be judged, and corresponding pipeline dredging measures should be timely adopted.
If the alarm flickering condition does not occur, the NO.1 grouting path can perform normal grouting, and then the isolated 1# grouting pump can be judged to have faults, at the moment, the operation of a grouting system is suspended, and the left lower grouting port ball valve Q at the tail part of the shield is opened again W3 Ball valve Q of right lower grouting port W4 After the adjustment, the No.2 grouting pump independently plays a role of synchronous grouting system operation, grouting is carried out on 4 grouting openings at the tail of the shield, normal propulsion of the shield machine is maintained, and the isolated No.1 grouting pump also obtains maintenance time.
In order to better understand the control mode of the PLC, the invention is described with respect to keys of '1- > 2' and '2- > 1' on a human-computer interface:
1- > 2: when the emergency switch in the operation panel slides from stop to 1-2, the PLC controls to open left lower pneumatic switching plugs 3# and right lower pneumatic switching plugs 4# of the left emergency switch block and the right emergency switch block in the area B of the system, and at the moment, the 2# grouting pump can grouting left lower slurry path NO.3 and right lower slurry path NO.4 and grouting left upper slurry path NO.1 and right upper slurry path NO. 2.
2- > 1: similarly, when the emergency switch in the operation panel slides from stop to 2 to 1, the PLC controls to open the left upper pneumatic switching plug 1# and the right upper pneumatic switching plug 2# of the left emergency switch block and the right emergency switch block in the region B of the system, and at the moment, the 1# grouting pump can grouting left upper slurry path NO.1 and right upper slurry path NO.2 and grouting left lower slurry path NO.3 and right lower slurry path NO. 4.
The invention provides reliable data support and effective emergency treatment convenience for the construction of the subway tunnel shield machine, and the value of the device can be fully reflected along with being applied to more shield machines.
Claims (1)
1. The intelligent monitoring system comprises a synchronous grouting system of the tunnel shield, wherein the synchronous grouting system of the tunnel shield is distributed on a shield tail and a trolley, a left upper grouting port, a right upper grouting port, a left lower grouting port, a right lower grouting port and matched grouting port ball valve groups (QW 1, QW2, QW3 and QW 4) are arranged at the shield tail, two grouting pumps, namely a 1# grouting pump and a 2# grouting pump, are arranged on the trolley, each grouting pump provides two grouting liquid output ports, and four grouting liquid output ports are provided in total;
the system also comprises a PLC control system in the operation room; the method is characterized in that:
the synchronous grouting system of the tunnel shield is modified, and a branch pipe flowmeter set, a ball valve set and an emergency switching block device are sequentially arranged between an output port of a grouting pump and a shield tail according to a spatial relationship; the branched pipe flowmeter group comprises four branched pipe flowmeters; the ball valve group comprises four ball valves; the emergency switching block device is provided with four inlets and four outlets, so that four grouting liquid output ports, four branch pipe flow meters, four ball valves, the emergency switching block device and four grouting ports at the tail of the shield are sequentially connected in series to form four slurry conveying paths; a pressure sensor is designed in the structure of the branched pipe flowmeter;
the system comprises a pipeline or pump, an emergency switching block device, a grouting path, a control system and a control system, wherein the pipeline or pump is in fault, and then the emergency switching block device switches the slurry conveying path to complete logic judgment so as to realize the positioning of fault points;
the branch pipe flowmeter can accurately monitor the slurry consumption of the slurry conveying path in real time;
the PLC control system comprises a slurry consumption calculation module, a fault monitoring judgment module and a man-machine interaction module;
the input of the PLC control system is connected with the branch pipe flowmeter to obtain the pressure of the conveying slurry path in real time; the slurry consumption calculation module calculates and obtains the slurry consumption on the branch according to the pressure of the slurry conveying path, obtains the slurry consumption sum after four paths of addition and accumulation time, provides the slurry consumption sum for the fault monitoring and judging module to analyze, and displays the result in the man-machine interaction module;
the output of the PLC control system is connected with the emergency switching block device, and the PLC control system is matched with the fault monitoring judgment and the man-machine interaction module to help the staff judge and confirm the condition of the tunnel shield synchronous grouting system;
the inlet end of the emergency switching block device is connected with four ball valves; the four ball valves are respectively an upper left ball valve (Q1), an upper right ball valve (Q2), a lower left ball valve (Q3) and a lower right ball valve, and are all manual ball valves; the four branch pipe flow meters are respectively an upper left branch pipe flow meter (A1), an upper right branch pipe flow meter (A2), a lower left branch pipe flow meter (A3) and a lower right branch pipe flow meter (A4); the upper left grouting liquid inlet and the upper right grouting liquid inlet are communicated with a No.1 grouting pump; the left lower grouting liquid inlet and the right lower grouting liquid inlet are communicated with a No.2 grouting pump; the emergency switching block device comprises a left switching block and a right switching block which are not communicated with each other;
taking a left side switching block as an example;
the switching block comprises two grouting pipes which are horizontally parallel up and down, two inlets, two grouting pipes which are obliquely parallel up and down, two outlets and two pneumatic switching plugs;
the two pneumatic switching plugs are specifically an upper left pneumatic switching plug (1#) and a lower left pneumatic switching plug (3#) and can be respectively arranged on the upper left through hole (331) and the lower left through hole (333); the horizontal upper grouting pipe is provided with an upper left through hole (331), and the upper left through hole (331) is positioned between the two inclined grouting pipes; a left lower through hole (333) is arranged on the inclined upper grouting pipe, and the left lower through hole (333) is positioned between the two horizontal grouting pipes;
when the two pneumatic switching plugs (1#, 3#) are closed, the inlet of the upper left grouting pipe and the inlet of the lower left grouting pipe flow out from the upper left grouting liquid outlet and the lower left grouting liquid outlet respectively;
when the left upper pneumatic switching plug (1#) is opened, the slurry at the inlet of the left upper grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
when the left lower pneumatic switching plug (3#) is opened, the slurry at the inlet of the left lower grouting pipe flows out from the left upper grouting liquid outlet and the left lower grouting liquid outlet simultaneously;
the right side switching block is provided with a corresponding right upper pneumatic switching plug (2#) and a right lower pneumatic switching plug (4#) in the same manner, and can be respectively arranged in the right upper through hole and the right lower through hole; the mechanism is the same as above;
thus, four inlets in the emergency switching block device: the left upper inlet, the right upper inlet, the left lower inlet and the right lower inlet are respectively correspondingly connected with the left upper ball valve (Q1), the right upper ball valve (Q2), the left lower ball valve (Q3) and the right lower ball valve in the four ball valves; four outlets in the emergency switching block device: the upper left grouting liquid outlet, the upper right grouting liquid outlet, the lower left grouting liquid outlet and the lower right grouting liquid outlet are respectively and correspondingly connected with the upper left grouting path (NO. 1), the upper right grouting path (NO. 2), the lower left grouting path (NO. 3) and the lower right grouting path (NO. 4).
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