CN114033395A - Mud cake preventing device and method for earth pressure balance type shield machine - Google Patents
Mud cake preventing device and method for earth pressure balance type shield machine Download PDFInfo
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- CN114033395A CN114033395A CN202111263386.1A CN202111263386A CN114033395A CN 114033395 A CN114033395 A CN 114033395A CN 202111263386 A CN202111263386 A CN 202111263386A CN 114033395 A CN114033395 A CN 114033395A
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- 238000000034 method Methods 0.000 title claims description 12
- 239000002689 soil Substances 0.000 claims abstract description 167
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 238000012806 monitoring device Methods 0.000 claims abstract description 34
- 239000008235 industrial water Substances 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000004088 foaming agent Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 100
- 239000006260 foam Substances 0.000 claims description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 230000001276 controlling effect Effects 0.000 claims description 22
- 238000005086 pumping Methods 0.000 claims description 22
- 230000005641 tunneling Effects 0.000 claims description 17
- 230000002265 prevention Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 11
- 239000000243 solution Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
-
- 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
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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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
- E21D9/0685—Foaming agents
-
- 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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/124—Helical conveying means therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a mud cake preventing device for an earth pressure balance type shield machine, which comprises: the shield machine comprises a cutter head, a swing mechanism, a soil bin wall and a screw machine; a plurality of injection ports are formed in the cutter head and the soil bin wall; a soil bin is formed between the cutter head and the soil bin wall; the soil slag temperature monitoring device is arranged inside the shield machine and used for monitoring the soil slag temperature inside the shield machine; the pipeline system comprises an industrial water branch, a hydrogen peroxide solution branch and a foaming agent branch, and the pipeline system is communicated with the injection ports; and the control element is respectively connected with the soil residue temperature monitoring device and the pipeline system, and controls the pipeline system to inject industrial water, bubble bath or mixed liquid of the bubble bath and hydrogen peroxide into each injection port according to the temperature monitored by the soil residue temperature monitoring device. The invention can greatly reduce the times and time of shield machine halt and warehouse opening inspection, and ensure the construction period and the construction quality.
Description
Technical Field
The invention relates to the field of earth pressure balance type shield machines. More particularly, the invention relates to a mud cake preventing device and method for an earth pressure balance type shield machine.
Background
With the gradual development of urban rail transit, the shield method is more and more widely applied as a safe and convenient construction method. When the earth pressure balance type shield machine is used for construction in a cohesive soil layer, mud cakes are easily generated at a cutter head, the cutting torque of the shield machine is increased, the tunneling speed is reduced, the temperature in an earth bin is increased, and the service life of the shield machine is seriously influenced. In traditional solution, need earlier to shut down the shield structure machine, carry out the inspection of opening a warehouse again, frequently open a warehouse inspection on the one hand can the time limit for a project, improves construction cost, and on the other hand shield structure machine long-time stewing can increase the disturbance to the stratum, causes accidents such as excavation face unstability and ground collapse easily.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a mudcake prevention device for an earth pressure balanced shield machine, comprising:
the shield machine comprises a cutter head, a swing mechanism, a soil bin wall and a screw machine; the rotating mechanism is rotatably connected with the soil bin wall, the cutter head is fixedly connected with the rotating mechanism, and a plurality of injection ports are formed in the cutter head and the soil bin wall; a soil bin is formed between the cutter head and the soil bin wall, a soil inlet of the screw conveyor is arranged inside the soil bin, and a soil outlet of the screw conveyor is arranged outside the soil bin;
the soil slag temperature monitoring device is arranged inside the shield machine and used for monitoring the soil slag temperature inside the shield machine;
the pipeline system comprises an industrial water branch, a hydrogen peroxide solution branch and a foaming agent branch, and the pipeline system is communicated with the injection ports;
and the control element is respectively connected with the soil residue temperature monitoring device and the pipeline system, and controls the pipeline system to inject industrial water, bubble bath or mixed liquid of the bubble bath and hydrogen peroxide into each injection port according to the temperature monitored by the soil residue temperature monitoring device.
Preferably, the temperature monitoring device for the soil residues comprises a plurality of contact temperature sensors and non-contact temperature sensors; an annular groove is formed in the inner wall, close to the soil outlet, of the screw conveyor, and the plurality of contact type temperature sensors are arranged on one side, facing the cutter disc, of the soil bin wall and in the groove respectively; the device is characterized in that a belt conveyor is arranged below the soil outlet of the screw conveyor, and the non-contact temperature sensor is arranged above the belt conveyor.
Preferably, one end of the groove close to the soil outlet is inclined towards the axial direction of the soil outlet to form an inclined surface part.
Preferably, the industrial water branch comprises an industrial water system, a water valve and a first flow regulating device, and the water valve and the first flow regulating device are sequentially arranged on a pipeline communicated with the industrial water system; the foaming agent branch comprises a foaming agent box and a second flow regulating device, and the second flow regulating device is arranged on a pipeline communicated with the foaming agent box; the hydrogen peroxide solution branch comprises a hydrogen peroxide solution tank and a third flow regulating and controlling device, and the third flow regulating and controlling device is arranged on a pipeline communicated with the hydrogen peroxide solution tank.
Preferably, the pipeline system further comprises a foam mixing branch, the foam mixing branch comprises a foam generator and a fourth flow regulating and controlling device, and the fourth flow regulating and controlling device is arranged on a pipeline communicated with the output end of the foam generator; the input end of the foam generator is respectively connected with the first flow regulating device and the second flow regulating device.
Preferably, the pipeline system further comprises a mixed liquor branch of bubble bath and hydrogen peroxide, the mixed liquor branch of bubble bath and hydrogen peroxide comprises a mixing box and a fifth flow regulating and controlling device, the fifth flow regulating and controlling device is arranged on a pipeline communicated with the output end of the mixing box, and the fifth flow regulating and controlling device is communicated with each injection port through a pipeline; and the input end of the mixing box is respectively communicated with the fourth flow regulating and controlling device and the third flow regulating and controlling device.
Preferably, a stirrer is further installed in the mixing box.
Preferably, the first flow regulating and controlling device, the second flow regulating and controlling device, the third flow regulating and controlling device, the fourth flow regulating and controlling device and the fifth flow regulating and controlling device each include a flow regulating and controlling unit, the flow regulating and controlling unit includes a water pump, an electric regulating valve and a flow meter which are sequentially arranged along a flow direction of a pipeline, and the water pump, the electric regulating valve and the flow meter are respectively connected with the control element.
Preferably, the flow regulation and control unit further comprises a check valve, and the check valve is arranged at one end, far away from the electric control valve, of the flowmeter.
Still another object of the present invention is to provide a mud cake preventing method using a mud cake preventing device for an earth pressure balanced type shield machine, comprising the steps of:
s1, mounting a soil slag temperature monitoring device and a pipeline system on the shield machine;
step S2, after the shield machine starts working, the soil slag temperature monitoring device monitors the soil slag temperature in the shield machine in real time;
s3, when the temperature of the soil residues measured by the soil residue temperature monitoring device is less than or equal to 35 ℃, the pipeline system does not participate in the work of the shield machine; when the temperature of the soil residues is more than 35 ℃ and less than or equal to 40 ℃, the step S4 is carried out; when the temperature of the soil residues is higher than 40 ℃ and lower than or equal to 45 ℃, the step S5 is carried out; when the temperature of the soil residues is more than 45 ℃ and less than or equal to 50 ℃, the step S6 is carried out; when the temperature of the soil residues is higher than 50 ℃, stopping the shield tunneling machine for inspection;
step S4, pumping water in the industrial water system into a foam generator through a first flow regulating device, a fourth flow regulating device and a fifth flow regulating device in sequence, further pumping into a mixing box, and finally pumping into each injection opening;
step S5, pumping water and a foaming agent into a foam generator through a first flow regulating device and a second flow regulating device at the same time, pumping the generated foam into a mixing box through a fourth flow regulating device, and pumping the foam into each injection opening through a fifth flow regulating device;
step S6, water and a foaming agent are pumped into the foam generator through the first flow regulating device and the second flow regulating device at the same time, foam is generated and then pumped into the mixing box through the fourth flow regulating device, and the hydrogen peroxide solution is also pumped into the mixing box through the third flow regulating device, so that mixed liquid of bubble bath and hydrogen peroxide is formed in the mixing box and then pumped into each injection opening through the fifth flow regulating device.
The invention at least comprises the following beneficial effects:
according to the mud cake preventing device and method for the earth pressure balance type shield machine, the temperature of the soil residues is monitored by arranging the soil residue temperature monitoring device at the soil outlet of the screw machine, the hardening condition of the soil residues in the soil bin is judged according to the temperature of the soil residues, and different modifying agents are pumped into the cutterhead and the injection ports on the wall of the soil bin through the pipeline system according to different temperature conditions, so that the purpose of preventing mud cakes is achieved, the times and time for stopping the shield machine and checking the opening of the shield machine are greatly reduced, the complicated steps of soil residue improvement in the actual construction process are effectively avoided, and the construction period and the construction quality are guaranteed.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of the mud cake prevention device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a flow chart of the mud cake prevention method in the above embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 2, the present invention provides a mud cake prevention device for an earth pressure balanced shield machine, including:
the shield machine 1 comprises a cutter head 11, a slewing mechanism 13, a soil bin wall 12 and a screw machine 15; the rotating mechanism 13 is rotatably connected with the soil bin wall 12, the cutter head 11 is fixedly connected with the rotating mechanism 13, and a plurality of injection ports 14 are formed in the cutter head 11 and the soil bin wall 12; a soil bin is formed between the cutter head 11 and the soil bin wall 12, a soil inlet of the screw conveyor 15 is arranged inside the soil bin, and a soil outlet of the screw conveyor is arranged outside the soil bin;
the soil slag temperature monitoring device 2 is arranged inside the shield machine 1 and used for monitoring the soil slag temperature inside the shield machine 1;
a piping system including an industrial water branch 32, a hydrogen peroxide solution branch 31, and a foaming agent branch 33, the piping system communicating with each of the injection ports 14;
and the control element is respectively connected with the soil residue temperature monitoring device 2 and the pipeline system, and controls the pipeline system to inject industrial water, bubble bath or mixed liquid of the bubble bath and hydrogen peroxide into each injection port according to the temperature monitored by the soil residue temperature monitoring device 2.
In the technical scheme, when the shield machine 1 advances, the cutter head 11 at the front end of the shield machine is driven by the rotary structure 13 to rotate to dig the stratum soil body, the cut soil residues enter the soil bin, and then the soil residues are conveyed outwards through the screw machine 15. The shield machine 1 further comprises a front shield, a middle shield, a shield tail, an electrical system, a power system and other structures of the conventional earth pressure balanced shield machine, and details are not repeated herein. As the temperature of the soil residues during residue discharging of the soil pressure balanced type shield machine is closely related to the temperature in the soil bin, the hardening condition of the soil residues and the like, the temperature of the soil residues is about 30-35 ℃ under the normal condition, and when the temperature is higher than 35 ℃, mud cakes can be generated. Therefore, the soil slag temperature monitoring device 2 is arranged in the shield machine to measure the soil slag temperature in the shield machine. And judging the hardening condition of the soil residues in the soil bin according to the measured temperature. The control element receives the temperature data measured by the soil slag temperature monitoring device 2, the control element can be a PLC (programmable logic controller) or a combination of the PLC and an industrial personal computer, and the control element is not limited to the above, and the control element can receive the data and perform related logic operation and logic control. The control element controls the industrial water branch 32, the hydrogen peroxide solution branch 31 or the foaming agent branch 33 in the pipeline system, three modifying agents of industrial water, foam bath or foam bath and hydrogen peroxide mixed liquid are injected into the cutter head 11 and the injection ports 14 on the soil bin wall 12, the modifying agents are injected into the tunneling surface and the soil residues in the soil bin through the injection ports 14, the property of the soil residues is changed, the soil residues are not bonded into mud cakes or the bonded mud cakes with low hardening degree are dispersed, different modifying agents are provided according to different soil residue hardening conditions in the soil bin, and the purposes of modifying the soil residues and preventing and controlling the generation of the mud cakes are achieved. In the process, the shield machine 1 needs to be stopped for inspection only when the soil slag temperature monitoring device 2 measures that the soil slag temperature in the shield machine 1 is higher than 50 ℃. Therefore, the mud cake prevention device greatly reduces the times and time of shutdown and opening inspection of the shield machine 1, and effectively avoids the complicated step of soil residue improvement in the actual construction process, thereby ensuring the construction period and the construction quality.
In another embodiment, the temperature monitoring device 2 comprises a plurality of contact temperature sensors 21 and non-contact temperature sensors; an annular groove 151 is formed in the inner wall, close to the soil outlet, of the screw machine 15, and the plurality of contact temperature sensors 21 are respectively arranged on one side, facing the cutter head 11, of the soil bin wall 12 and in the groove 151; a belt conveyor is arranged below the soil outlet of the screw conveyor 15, and the non-contact temperature sensor is arranged above the belt conveyor.
In this solution, the temperature of the soil residue in the soil bin is directly measured by the contact temperature sensor 21 disposed on the side of the soil bin wall 12 facing the cutter head 11. Considering that other electrical equipment is also included on the soil silo wall 12, and the heat generated by the equipment during operation affects the measurement accuracy of the temperature sensor 21 on the soil silo wall 12, the temperature sensor 21 is also arranged in the groove 151 of the soil outlet of the screw machine 15, and the temperature of the soil residues at the soil outlet is measured. Further, a belt conveyor is arranged below the soil outlet of the screw conveyor 15 and used for conveying the soil residues out of the shield machine 1, and therefore the non-contact temperature sensor is arranged above the belt conveyor and used for measuring the temperature of the soil residues on the belt conveyor. Then, the average value of the soil slag temperatures measured by the three measuring points is taken to represent the soil slag temperature in the shield tunneling machine 1 measured by the soil slag temperature monitoring device 2, namely the reference value for judging the condition of the soil cake in the soil bin.
In another embodiment, one end of the groove 151 near the soil outlet is inclined toward the axial direction of the soil outlet to form an inclined surface portion. The inclined surface portion is arranged to prevent soil from accumulating in the groove 151, and therefore the measurement accuracy of the temperature sensor 21 is affected.
In another embodiment, the industrial water branch 32 includes an industrial water system 321, a water valve 322 and a first flow control device 323, and the water valve 322 and the first flow control device 323 are sequentially disposed on a pipeline communicated with the industrial water system 321; the foaming agent branch 33 comprises a foaming agent tank 331 and a second flow regulating device 332, and the second flow regulating device 332 is arranged on a pipeline communicated with the foaming agent tank 331; the hydrogen peroxide solution branch 33 includes a hydrogen peroxide solution tank 311 and a third flow rate control device 312, and the third flow rate control device 312 is disposed on a pipeline communicated with the hydrogen peroxide solution tank 311.
In this embodiment, a pipe communicating with the industrial water system 321, a pipe communicating with the foaming agent tank 331, and a pipe communicating with the hydrogen oxide solution tank 311 are respectively communicated with the injection ports 14. In view of the simplicity of the piping connections, a connection interface 36 may be provided between each injection port and the piping system. The first flow rate regulating device 323, the second flow rate regulating device 332 and the third flow rate regulating device 312 are respectively connected with the control element, and according to instructions sent by the control element, water, a foaming agent or a hydrogen peroxide solution are respectively pumped into pipelines communicated with the injection ports 14 from the industrial water system 321, the foaming agent tank 331 or the hydrogen peroxide solution tank 311, and the pumped flow rates are regulated.
In another embodiment, the pipeline system further comprises a foam mixing branch 34, the foam mixing branch 34 comprises a foam generator 343 and a fourth flow regulating device 344, and the fourth flow regulating device 344 is arranged on a pipeline communicated with an output end of the foam generator 343; the input end of the foam generator 343 is connected to the first flow control device 323 and the second flow control device 332, respectively.
In this solution, the foam mixing branch 34 is respectively communicated with the industrial water branch 32 and the foaming agent branch 33. The foam is injected into each injection port 14 and mixed well through the foam mixing branch 34, so that the improvement effect on the soil residues in the cutter head 11 and the soil bin is ensured. When foam is required to be injected into each injection port 14, the first flow control device 323 and the second flow control device 332 are controlled by the control element to simultaneously pump water and a foaming agent into the foam generator 343, mix the water and the foaming agent by the foam generator 343 to produce foam, and then pump the foam into each injection port 14 by the fourth flow control device 344. When it is only necessary to inject water into each injection port 14, water may be pumped from the industrial water system 321 into the foam generator 343 through the first flow rate control device 323, and then injected into each injection port 14 through the fourth flow rate control device 344.
In another embodiment, the pipeline system further includes a bubble bath and hydrogen peroxide mixed liquor branch 35, the bubble bath and hydrogen peroxide mixed liquor branch 35 includes a mixing tank 352 and a fifth flow regulation device 353, the fifth flow regulation device 353 is disposed on a pipeline communicated with an output end of the mixing tank 352, and the fifth flow regulation device 353 is communicated with each injection port through a pipeline; the input end of the mixing box 352 is connected to the fourth flow control device 344 and the third flow control device 312.
In this technical solution, the foam bath and hydrogen peroxide mixed liquor branch 35 is respectively communicated with the foam mixing branch 34 and the hydrogen peroxide solution branch 33. Through the foam bath and hydrogen peroxide mixed liquid branch 35, the foam and hydrogen peroxide mixed liquid injected into each injection opening 14 and mixed well is ensured to improve the effect of the cutter head 11 and the soil residues in the soil bin. When the mixed liquid of foam and hydrogen peroxide needs to be injected into each injection port 14, the mixed foam is firstly produced through the foam mixing branch 34, then the fourth flow rate control device 344 and the third flow rate control device 312 are controlled by the control element to simultaneously pump the foam and the hydrogen peroxide solution into the mixing box 352, the foam and the hydrogen peroxide solution are mixed in the mixing box 352 to obtain the mixed liquid of foam and hydrogen peroxide, and then the mixed liquid is pumped into each injection port 14 through the fifth flow rate control device 353. When only foam is required to be injected into each injection port, the foam mixing branch 34 may first produce mixed foam, and then the foam may be sequentially pumped into the mixing tank 352 and each injection port 14 through the fourth flow control device 344 and the fifth flow control device 353. When it is only necessary to inject water into each injection port 14, water is sequentially pumped from the industrial water system 321 to the foam generator 343, the mixing tank 352 and each injection port 14 through the first flow rate regulating device 323, the fourth flow rate regulating device 344 and the fifth flow rate regulating device 353.
In another embodiment, an agitator 351 is also mounted within the mixing box 352. The liquid in the mixing tank 352 is uniformly mixed by the stirrer 351.
In another embodiment, each of the first flow rate regulating device 323, the second flow rate regulating device 332, the third flow rate regulating device 312, the fourth flow rate regulating device 344 and the fifth flow rate regulating device 353 includes a flow rate regulating unit 30, the flow rate regulating unit 30 includes a water pump 301, an electric control valve 302 and a flow meter 303 sequentially arranged along a flow direction of a pipeline, and the water pump 301, the electric control valve 302 and the flow meter 303 are respectively connected to the control element.
In this solution, the water pump 301 is used to deliver liquid, and the electric control valve 302 regulates the flow according to the data measured by the flow meter 303. Therefore, the flow control of water, foam and the mixed liquid of foam and hydrogen peroxide can be realized through the first flow regulating device 323, the second flow regulating device 332, the third flow regulating device 312, the fourth flow regulating device 344 and the fifth flow regulating device 353; the proportion of two modifying agents, namely foam, a foam and hydrogen peroxide mixed solution, can be controlled through the first flow regulating device 323, the second flow regulating device 332, the third flow regulating device 312 and the fourth flow regulating device 344.
In another embodiment, the flow regulating unit 30 further includes a check valve 304, and the check valve 304 is disposed at an end of the flow meter 303 away from the electrical control valve 302. The reverse flow of the liquid caused by the reverse rotation of the water pump 301 or the like can be prevented by the check valve 304.
As shown in fig. 3, the present invention also provides a mud cake preventing method using a mud cake preventing device for an earth pressure balanced shield machine, comprising the steps of:
step S1, installing a soil slag temperature monitoring device 2 and a pipeline system on the shield machine 1;
step S2, after the shield machine 1 starts working, the soil slag temperature monitoring device 2 monitors the soil slag temperature in the shield machine 1 in real time;
s3, when the temperature of the soil residues measured by the soil residue temperature monitoring device 2 is less than or equal to 35 ℃, the pipeline system does not participate in the work of the shield machine; when the temperature of the soil residues is more than 35 ℃ and less than or equal to 40 ℃, the step S4 is carried out; when the temperature of the soil residues is higher than 40 ℃ and lower than or equal to 45 ℃, the step S5 is carried out; when the temperature of the soil residues is more than 45 ℃ and less than or equal to 50 ℃, the step S6 is carried out; when the temperature of the soil residues is higher than 50 ℃, stopping the shield tunneling machine 1 for inspection;
step S4, pumping the water in the industrial water system into the foam generator 343 through the first flow rate control device 323, the fourth flow rate control device 344 and the fifth flow rate control device 353, and then further pumping the water into the mixing tank 352, and finally pumping the water into each injection port 14;
step S5, pumping water and a foaming agent into the foam generator 343 through the first flow rate control device 323 and the second flow rate control device 332 at the same time, generating foam, pumping the foam into the mixing tank 352 through the fourth flow rate control device 344, and pumping the foam into each injection port 14 through the fifth flow rate control device 353;
step S6, pumping water and foaming agent into the foam generator 343 through the first flow rate control device 323 and the second flow rate control device 332 at the same time, pumping the foam into the mixing tank 352 through the fourth flow rate control device 344 after generating foam, pumping the hydrogen peroxide solution into the mixing tank 352 through the third flow rate control device 312, forming a mixed solution of bubble bath and hydrogen peroxide in the mixing tank 352, and pumping the mixed solution into each injection port 14 through the fifth flow rate control device 353.
In the technical scheme, the temperature of the soil residues during slag discharging of the soil pressure balanced type shield machine is closely related to the temperature in the soil bin, the hardening condition of the soil residues and the like, the temperature of the soil residues is about 30-35 ℃ under the normal condition, and when the temperature is higher than 35 ℃, mud cakes can be generated. Therefore, the formation of mud cakes can be prevented to a great extent by monitoring the temperature of the soil residues and immediately disposing the soil residues in front of the excavation surface. When the temperature of the soil residues at the soil outlet, measured by the soil residue temperature monitoring device 2, is less than 35 ℃, the soil residues basically have no hardening condition, at the moment, the pipeline system does not participate in the work of the shield tunneling machine, and the shield tunneling machine normally operates; when the temperature of the soil residues measured by the soil residue temperature monitoring device 2 is between 35 ℃ and 40 ℃, the soil residue is less hardened, and only water is required to be injected into each injection opening 14; when the temperature of the soil residues measured by the soil residue temperature monitoring device 2 is between 40 ℃ and 45 ℃, the soil residues are hardened seriously, and foam needs to be injected into each injection opening 14 to improve the soil residues and disperse mud cakes; when the temperature of the soil residues measured by the soil residue temperature monitoring device 2 is between 45 ℃ and 50 ℃, the soil residues are seriously hardened, and a mixed solution of bubble bath and hydrogen peroxide is required to be injected into each injection opening 14, so that the soil residues are further improved, and mud cakes are dispersed; when the temperature of the soil residues measured by the soil residue temperature monitoring device 2 is higher than 50 ℃, the shield machine needs to be stopped for inspection to check specific reasons.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a prevent mud cake device for earth pressure balanced type shield constructs machine which characterized in that includes:
the shield machine comprises a cutter head, a swing mechanism, a soil bin wall and a screw machine; the rotating mechanism is rotatably connected with the soil bin wall, the cutter head is fixedly connected with the rotating mechanism, and a plurality of injection ports are formed in the cutter head and the soil bin wall; a soil bin is formed between the cutter head and the soil bin wall, a soil inlet of the screw conveyor is arranged inside the soil bin, and a soil outlet of the screw conveyor is arranged outside the soil bin;
the soil slag temperature monitoring device is arranged inside the shield machine and used for monitoring the soil slag temperature inside the shield machine;
the pipeline system comprises an industrial water branch, a hydrogen peroxide solution branch and a foaming agent branch, and the pipeline system is communicated with the injection ports;
and the control element is respectively connected with the soil residue temperature monitoring device and the pipeline system, and controls the pipeline system to inject industrial water, bubble bath or mixed liquid of the bubble bath and hydrogen peroxide into each injection port according to the temperature monitored by the soil residue temperature monitoring device.
2. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 1, wherein the earth slag temperature monitoring device comprises a plurality of contact temperature sensors and non-contact temperature sensors; an annular groove is formed in the inner wall, close to the soil outlet, of the screw conveyor, and the plurality of contact type temperature sensors are arranged on one side, facing the cutter disc, of the soil bin wall and in the groove respectively; the device is characterized in that a belt conveyor is arranged below the soil outlet of the screw conveyor, and the non-contact temperature sensor is arranged above the belt conveyor.
3. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 2, wherein one end of the groove near the earth outlet is inclined toward the axial direction of the earth outlet to form an inclined surface portion.
4. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 1, wherein the industrial water branch comprises an industrial water system, a water valve and a first flow regulating device, and the water valve and the first flow regulating device are sequentially arranged on a pipeline communicated with the industrial water system; the foaming agent branch comprises a foaming agent box and a second flow regulating device, and the second flow regulating device is arranged on a pipeline communicated with the foaming agent box; the hydrogen peroxide solution branch comprises a hydrogen peroxide solution tank and a third flow regulating and controlling device, and the third flow regulating and controlling device is arranged on a pipeline communicated with the hydrogen peroxide solution tank.
5. The mud cake prevention device for the earth pressure balanced type shield tunneling machine according to claim 4, wherein the pipeline system further comprises a foam mixing branch, the foam mixing branch comprises a foam generator and a fourth flow regulating device, and the fourth flow regulating device is arranged on a pipeline communicated with the output end of the foam generator; the input end of the foam generator is respectively connected with the first flow regulating device and the second flow regulating device.
6. The mud cake preventing device for the earth pressure balance type shield tunneling machine according to claim 5, wherein the pipeline system further comprises a bubble bath and hydrogen peroxide mixed liquor branch, the bubble bath and hydrogen peroxide mixed liquor branch comprises a mixing box and a fifth flow regulating device, the fifth flow regulating device is arranged on a pipeline communicated with the output end of the mixing box, and the fifth flow regulating device is communicated with each injection port through a pipeline; and the input end of the mixing box is respectively communicated with the fourth flow regulating and controlling device and the third flow regulating and controlling device.
7. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 6, wherein a stirrer is further installed in the mixing box.
8. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 6, wherein the first flow regulating device, the second flow regulating device, the third flow regulating device, the fourth flow regulating device and the fifth flow regulating device each comprise a flow regulating unit, the flow regulating unit comprises a water pump, an electric control valve and a flow meter which are sequentially arranged along a pipeline flow direction, and the water pump, the electric control valve and the flow meter are respectively connected with the control element.
9. The mud cake preventing device for the earth pressure balanced type shield tunneling machine according to claim 8, wherein the flow regulating and controlling unit further comprises a check valve, and the check valve is arranged at one end of the flowmeter, which is far away from the electric regulating valve.
10. The mud cake preventing method using the mud cake preventing device for the earth pressure balanced type shield tunneling machine according to any one of claims 1 to 9, comprising the steps of:
s1, mounting a soil slag temperature monitoring device and a pipeline system on the shield machine;
step S2, after the shield machine starts working, the soil slag temperature monitoring device monitors the soil slag temperature in the shield machine in real time;
s3, when the temperature of the soil residues measured by the soil residue temperature monitoring device is less than or equal to 35 ℃, the pipeline system does not participate in the work of the shield machine; when the temperature of the soil residues is more than 35 ℃ and less than or equal to 40 ℃, the step S4 is carried out; when the temperature of the soil residues is higher than 40 ℃ and lower than or equal to 45 ℃, the step S5 is carried out; when the temperature of the soil residues is more than 45 ℃ and less than or equal to 50 ℃, the step S6 is carried out; when the temperature of the soil residues is higher than 50 ℃, stopping the shield tunneling machine for inspection;
step S4, pumping water in the industrial water system into a foam generator through a first flow regulating device, a fourth flow regulating device and a fifth flow regulating device in sequence, further pumping into a mixing box, and finally pumping into each injection opening;
step S5, pumping water and a foaming agent into a foam generator through a first flow regulating device and a second flow regulating device at the same time, pumping the generated foam into a mixing box through a fourth flow regulating device, and pumping the foam into each injection opening through a fifth flow regulating device;
step S6, water and a foaming agent are pumped into the foam generator through the first flow regulating device and the second flow regulating device at the same time, foam is generated and then pumped into the mixing box through the fourth flow regulating device, and the hydrogen peroxide solution is also pumped into the mixing box through the third flow regulating device, so that mixed liquid of bubble bath and hydrogen peroxide is formed in the mixing box and then pumped into each injection opening through the fifth flow regulating device.
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| CN202111263386.1A CN114033395B (en) | 2021-10-28 | 2021-10-28 | Mud cake preventing device and method for earth pressure balance type shield machine |
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