CN111119914B - Working mode conversion method of shield machine with adjustable density - Google Patents
Working mode conversion method of shield machine with adjustable density Download PDFInfo
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- CN111119914B CN111119914B CN201911248808.0A CN201911248808A CN111119914B CN 111119914 B CN111119914 B CN 111119914B CN 201911248808 A CN201911248808 A CN 201911248808A CN 111119914 B CN111119914 B CN 111119914B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 126
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 230000005641 tunneling Effects 0.000 claims abstract description 51
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 230000001502 supplementing effect Effects 0.000 claims description 14
- 238000010790 dilution Methods 0.000 claims description 9
- 239000012895 dilution Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 239000011440 grout Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 235000019994 cava Nutrition 0.000 abstract description 5
- 239000002689 soil Substances 0.000 description 10
- 108010066114 cabin-2 Proteins 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001739 density measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a working mode conversion method of a density-adjustable shield machine, which is characterized in that when the shield machine is converted from a slurry water mode to the density-adjustable mode, the shield machine keeps tunneling, a slurry inlet pipeline, a screw machine and a slurry discharge pipeline keep working, high-density slurry is supplemented to a slurry water bin through a slurry adding injection pipeline, a density measuring pipeline is opened to measure and monitor the slurry density in the slurry water bin, the measured value is compared with a standard range, and the input quantity of the slurry adding injection pipeline and the output quantity of the screw machine are adjusted according to the comparison result, so that the density in the slurry water bin is kept in the standard range. Under special geological conditions such as karst caves and the like, mud films are damaged, mud escapes, the shield machine can be rapidly switched into a density-adjustable mode through the method, the stability of tunnel face pressure is further realized by controlling the density pressure gradient of a mud sump, the tunneling safety and the construction efficiency of the shield machine under the complex geological conditions are greatly improved, and the shield machine can better adapt to the construction conditions of complex geology.
Description
Technical Field
The invention relates to a working mode conversion method of a density-adjustable shield tunneling machine, which is suitable for being used in an interval with special geology such as karst caves and soil caves in a more geological complex rock stratum and belongs to the field of shield construction.
Background
The shield machine becomes one of the core components of the shield method construction of the current underground tunnel construction, and along with the development of science and technology, the requirement on the adaptive design of the shield machine is higher and higher. In the interval with large geological condition change, the condition of difficult tunneling can occur in the geological complex section, so that the construction period and the cost can be influenced, and even the occurrence of dangerous conditions such as collapse can occur, thereby bringing potential safety hazards to tunnel construction and safety construction. Therefore, the design concept of the shield machine is gradually changed from the design concept of the shield machine with a single mode to the design concept of the shield machine with multiple modes.
The shield machine with the form of combining soil pressure and muddy water gradually appears in the industry at present, and the mutual conversion between muddy water and soil pressure can be realized, for example, the invention patent with the application number of 2019106754166 discloses a muddy water and soil pressure dual-mode shield machine, but the dual-mode shield machine can not solve the problems that when a mud film in front of a cutter head is damaged, mud escapes and the face pressure can not be stabilized when a karst cave soil cave and other special geology are met.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for switching operating modes of a density adjustable shield tunneling machine.
In order to achieve the above purposes, the invention adopts the technical scheme that: a working mode conversion method of a density-adjustable shield tunneling machine comprises a shield body, an air cushion bin arranged in front of the shield body, a muddy water bin arranged in front of the air cushion bin, a cutter disc arranged in front of the muddy water bin, a slurry inlet pipeline with an output end connected to the muddy water bin, a slurry supplementing pipeline with an input end connected with the slurry inlet pipeline and an output end connected to the air cushion bin, a screw machine with an inlet connected to the bottom of the muddy water bin, a slurry box connected with an outlet of the screw machine, and a slurry discharging pipeline with an input end connected with the slurry box. The shield machine also comprises a mud adding injection pipeline with an output end connected to the mud sump, and a density measuring pipeline with an input end and an output end both connected with the mud sump, when the shield machine is converted from the mud mode to the density adjustable mode, the shield machine keeps tunneling, the slurry inlet pipeline, the screw machine and the slurry discharge pipeline keep working, high-density slurry is supplemented to the mud sump through the mud adding injection pipeline, the density measuring pipeline is opened to measure and monitor the density of the slurry in the mud sump, the measured value is compared with a standard range, and the input quantity of the mud adding injection pipeline and the output quantity of the screw machine are adjusted according to the comparison result, so that the density in the mud sump is kept in the standard range. The standard range herein refers to a predetermined density range or a predetermined density value.
Furthermore, a check valve is arranged at the communication position of the muddy water bin and the air cushion bin, and when the pressure in the muddy water bin is lower than that in the air cushion bin, slurry in the air cushion bin is supplemented to the muddy water bin through the check valve.
Furthermore, the shield tunneling machine further comprises a slurry supplementing pipeline, wherein the input end of the slurry supplementing pipeline is connected with the slurry inlet pipeline, the output end of the slurry supplementing pipeline is connected to the air cushion bin, and when the liquid level in the air cushion bin drops, slurry is supplemented to the air cushion bin through the slurry supplementing pipeline, so that the liquid level in the air cushion bin is kept stable.
Furthermore, the shield tunneling machine further comprises an air pressure maintaining pipeline of which the output end is connected to the upper part of the air cushion bin so as to convey air to the air cushion bin to keep the pressure of the air cushion bin balanced, and the tunnel face pressure is adjusted through the air pressure maintaining pipeline and the grout supplementing pipeline.
Furthermore, the shield machine also comprises a dilution pipeline, wherein the input end of the dilution pipeline is connected with the slurry inlet pipeline, the output end of the dilution pipeline is connected to the slurry tank, and the dilution pipeline is used for washing and diluting the slurry tank.
Further, the density measuring pipeline comprises a pipeline, a density measuring circulating pump capable of enabling the slurry in the slurry cabin to circulate through the pipeline, and a densimeter for measuring the density of the slurry in the pipeline.
Further, the density of the slurry in the slurry inlet pipeline is 1.05-1.15t/m 3.
Further, the density of the high-density slurry is 1.3 to 1.5t/m 3.
Further, when the measured value is lower than the reference range, the flow rate of the mud feeding injection pipeline is reduced and the rotation speed of the screw machine is reduced, and when the measured value is larger than the reference range, the flow rate of the mud feeding injection pipeline is increased and the rotation speed of the screw machine is increased.
By adopting the technical scheme, the working mode conversion method of the density-adjustable shield tunneling machine can be applied to a slurry shield tunneling machine and a slurry-soil pressure dual-mode shield tunneling machine, a mud film is damaged and mud escapes under special geological conditions such as karst caves, the shield tunneling machine can be rapidly switched into a density-adjustable mode through the method, and the tunnel face pressure is stabilized through density control; the shield machine is additionally provided with a density measurement system, and the density pressure gradient of the slurry cabin is controlled through the interlocking modes of high-density slurry, slurry feeding, screw machine rotating speed adjustment and the like, so that the stability of tunnel face pressure is realized, the tunneling safety and the construction efficiency of the shield machine under the complex geological condition are greatly improved, and the shield machine can better adapt to the construction condition of complex geology.
Drawings
FIG. 1 is a schematic diagram of a density-adjustable shield tunneling machine in a muddy water working state and a density-adjustable working state according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of the density-adjustable shield tunneling machine in an earth pressure working state according to the second embodiment of the present invention.
The reference numbers in the figures are:
1. a shield body; 2. an air cushion bin; 3. a muddy water bin; 4. a screw machine; 5. a conveying device; 6. a mud tank; 7. a slurry discharge pipeline; 8. a slurry inlet pipeline; 9. a slurry supplementing pipeline; 10. Measuring a density pipeline; 101. measuring a density circulating pump; 11. flushing the pipeline; 12. preventing the pipeline from being blocked; 13. a mud injection pipeline; 14. an air pressure maintaining pipeline; 15. a crusher; 16. a bypass line; 17. a communicating pipe; 18. a dilution pipeline.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art.
Referring to fig. 1, the working mode conversion method of the density-adjustable shield tunneling machine in this embodiment includes a shield body 1, an air cushion chamber 2 disposed in front of the shield body 1, a muddy water chamber 3 disposed in front of the air cushion chamber 2, a cutter head disposed in front of the muddy water chamber 3, a slurry inlet pipeline 8 having an output end connected to the muddy water chamber 3, a slurry supplementing pipeline 9 having an input end connected to the slurry inlet pipeline 8 and an output end connected to the air cushion chamber 2, a screw machine 4 having an inlet connected to the bottom of the muddy water chamber 3, a slurry tank 6 connected to an outlet of the screw machine 4, a slurry discharge pipeline 7 having an input end connected to the slurry tank 6, a slurry adding injection pipeline 13 having an output end connected to the muddy water chamber 3, and a density measuring pipeline 10 having an input end and an output end both connected to the muddy water chamber 3.
In this embodiment, the density measuring pipeline 10 includes a pipeline, a density measuring circulating pump 101 capable of circulating the slurry in the slurry tank 3 through the pipeline, and a densimeter for measuring the density of the slurry in the pipeline. During measurement, the density measuring circulating pump 101 pumps out slurry in the slurry bin 3, and the slurry flows through the densimeter to be measured and then is pumped back to the slurry bin 3.
When the shield tunneling machine tunnels in a slurry mode, the slurry cabin 3 is communicated with the air cushion cabin 2, slurry is injected into the slurry cabin 3 through the slurry inlet pipeline 8, and slurry mixed sand and stone at the bottom of the slurry cabin 3 are conveyed to the slurry box 6 through the screw machine 4 and discharged through the slurry discharge pipeline 7. The density of the mud injected into the mud pipeline 8 is preferably 1.05-1.15t/m3。
The high-density slurry injected into the mud injection pipeline 13 is modulated in advance according to the geological survey and calculation data and the tunnel face pressure and recommended density parameters provided by the ground, so that preparation is made for the adjustable density mode tunneling. The density of the high-density slurry is preferably 1.3-1.5t/m3。
When a karst cave occurs in a tunneling section of the shield tunneling machine, a corresponding pressure sensor in the shield tunneling machine obviously changes, mud escapes from the mud bin 3, and the shield tunneling machine needs to be converted from a mud mode to an adjustable density mode, wherein the method comprises the following steps: the shield machine keeps tunneling, the slurry inlet pipeline 8, the screw machine 4 and the slurry discharge pipeline 7 keep working, high-density slurry is supplemented to the slurry cabin 3 through the slurry adding injection pipeline 13, the density measuring pipeline 10 is opened to measure and monitor the density of the slurry in the slurry cabin 3, the measured value is compared with a standard range, the input quantity of the slurry adding injection pipeline 13 and the output quantity of the screw machine 4 are adjusted according to the comparison result, and the density in the slurry cabin 3 is kept within the standard range.
Specifically, the input amount of the sludge injection line 13 and the output amount of the screw machine 4 are adjusted by adjusting the flow rate of the sludge injection line 13 and the rotation speed of the screw machine 4, respectively. More specifically, when the measured value is lower than the reference range, the flow rate of the sludge injection line 13 is decreased and the rotation speed of the screw machine 4 is decreased, and when the measured value is larger than the reference range, the flow rate of the sludge injection line 13 is increased and the rotation speed of the screw machine 4 is increased.
Preferably, the injection rate of the high density slurry is determined by the ratio of the high density slurry flow rate to the output of the screw machine 4, which is typically controlled to be between 20% and 40%. The injection rate is defined herein as the ratio between the flow rate of the high density mud and the volume of the excavated earth.
When the geological condition changes, the shield tunneling machine is switched from a muddy water mode to a variable density control mode according to a formula:
P=ρ·g·h （1）
in the formula (1): p is palm face pressure (kPa) of the shield tunneling machine in the stratum, rho is reference density (t/m) and g is gravity acceleration (m/s) during thin-walled carbon dioxide gas chromatography2) (ii) a And h is the depth from the ground surface to the axis of the shield tunneling machine. Therefore, the density pressure gradient control is used for replacing the traditional pressure control, and the high-efficiency tunneling under complex geology is realized.
In a more preferable embodiment, the mud water bin 3 is connected with the air cushion bin 2 through a communication pipe 17, a check valve is arranged at the communication pipe 17, and when the pressure in the mud water bin 3 is lower than that in the air cushion bin 2, mud in the air cushion bin 2 is supplemented to the mud water bin 3 through the check valve.
In a more preferable embodiment, the shield machine further comprises a slurry supplementing pipeline 9 with an input end connected with the slurry inlet pipeline 8 and an output end connected with the air cushion bin 2, and when the liquid level in the air cushion bin 2 drops, slurry is supplemented to the air cushion bin 2 through the slurry supplementing pipeline 9 to keep the liquid level in the air cushion bin 2 stable.
In a more preferred embodiment, the shield tunneling machine further comprises an air pressure maintaining pipeline 14, the output end of which is connected to the upper part of the air cushion chamber 2 to convey air into the air cushion chamber 2 to keep the air cushion chamber 2 in pressure balance, and the tunnel face pressure is adjusted through the air pressure maintaining pipeline 14 and the grout adding pipeline 9.
In a more preferred embodiment, the outlet of the screw machine 4 is provided with a crusher 15, which is capable of crushing large solid matter.
In a more preferred embodiment, the shield tunneling machine further comprises a dilution line 18 with an input end connected with the slurry inlet line 8 and an output end connected to the slurry tank 6, and the slurry tank 6 is washed and diluted through the dilution line 18.
In a more preferable embodiment, the shield tunneling machine further comprises an anti-stagnation exhaust pipeline 12, the input end of which is connected with the lower parts of the mud and water cabin 3 and the air cushion cabin 2, and the output end of which is connected with the mud tank 6, and the anti-stagnation exhaust pipeline is used for conveying the mud slurry accumulated in the air cushion cabin 2 and the mud and water cabin 3 into the mud tank 6 to wash and dilute, so that the problem of mud deposition at the bottoms of the air cushion cabin 2 and the mud and water cabin 3 is solved.
Example two
Referring to fig. 1 and fig. 2, the shield machine in the present embodiment is a muddy water and soil pressure dual-mode shield machine, which is different from the shield machine in the reference 1 only in that the shield machine in the present embodiment further includes a conveying device 5 detachably connected to an outlet of the screw machine 4 and used for conveying muck, and preferably, the conveying device 5 in the present embodiment is a belt conveyor. The shield machine in the embodiment further comprises a bypass pipeline 16, an input end of the bypass pipeline 16 is connected with the muddy water bin 3, an output end of the bypass pipeline is connected to the slurry discharge pipeline 7, and the bypass pipeline 16 can output the slurry in the muddy water bin 3 when the screw machine 4 does not work, and is not generally used in a muddy water mode and an adjustable density mode.
The shield machine in this embodiment further has an earth pressure mode, and when the slurry mode is switched from the slurry mode to the earth pressure mode, the slurry inlet pipeline 8 is firstly stopped to feed slurry, the rotation of the screw machine 4 is stopped, the gate of the screw machine 4, the air pressure maintaining system 14 and the communicating pipe 17 are closed, the bypass valve group 16 is opened, the shield machine still keeps slowly tunneling, and slurry in the slurry sump 3 is accumulated along with the residue and soil and is conveyed out of the tunnel to the slurry discharge pipeline 7 through the bypass pipeline 16. After the mud in the mud water bin 3 is completely replaced (namely, the mud is discharged, and the mud in the mud water bin 3 is muck), the mud tank 6, the crusher 15 and the mud discharge pipeline 7 are dismantled, the conveying device 5 is replaced, the screw machine 4 is rotated in the forward rotation and reverse rotation directions, large particles are discharged, the opening degree of the gate is gradually increased until the normal soil pressure mode is switched for tunneling.
The method for converting the slurry water mode into the density adjustable mode of the shield machine in the embodiment is the same as that in the first embodiment.
The working mode conversion method of the density-adjustable shield tunneling machine in the embodiment can be applied to a slurry shield tunneling machine and a slurry-soil pressure dual-mode shield tunneling machine, a mud film is damaged and mud escapes under special geological conditions such as karst caves, the shield tunneling machine can be rapidly switched into a density-adjustable mode through the method, and the tunnel face pressure is stable through density control; the shield machine is additionally provided with the density measurement system, and the density pressure gradient of the slurry cabin is controlled through the interlocking modes of high-density slurry, slurry feeding, screw machine rotating speed adjustment and the like, so that the stability of the tunnel face pressure is realized, the tunneling safety and the construction efficiency of the shield machine under the complex geological condition are greatly improved, and the shield machine can better adapt to the construction condition of complex geology
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A working mode conversion method of a density-adjustable shield tunneling machine comprises a shield body (1), an air cushion bin (2) arranged in front of the shield body (1), a muddy water bin (3) arranged in front of the air cushion bin (2), a cutter head arranged in front of the muddy water bin (3), a slurry inlet pipeline (8) of which the output end is connected to the muddy water bin (3), a slurry box (6) of which the input end is connected to the slurry inlet pipeline (8) and the output end is connected to a slurry supplementing pipeline (9) of the air cushion bin (2), a screw machine (4) of which the inlet is connected to the bottom of the muddy water bin (3), a slurry discharge pipeline (7) of which the input end is connected to the outlet of the screw machine (4) and the slurry discharge pipeline (7) of which the slurry box (6) are connected, wherein when the shield tunneling machine is in a muddy water mode, the muddy water bin (3) is communicated with the air cushion bin (2), advance slurry pipe way (8) to mud is injected into in muddy water storehouse (3), screw machine (4) will the mud mixed grit of muddy water storehouse (3) bottom is carried extremely mud case (6), warp arrange slurry pipe way (7) and discharge its characterized in that: the shield machine also comprises a mud adding injection pipeline (13) with an output end connected to the muddy water bin (3), an input end and an output end which are connected with a density measuring pipeline (10) connected with the muddy water bin (3), when the shield machine is converted from a muddy water mode to an adjustable density mode, the shield machine keeps tunneling, a slurry inlet pipeline (8), a screw machine (4) and a slurry discharge pipeline (7) keep working, high-density slurry is supplemented to the muddy water bin (3) through the mud adding injection pipeline (13), the density measuring pipeline (10) is opened to measure and monitor the mud density in the muddy water bin (3), a measured value is compared with a standard range, the input quantity of the mud adding injection pipeline (13) and the output quantity of the screw machine (4) are adjusted according to a comparison result, so that the density in the muddy water bin (3) is kept in the standard range,
the shield machine further comprises a pressure sensor capable of changing parameters when mud escapes from the mud sump, and when the parameters of the pressure sensor change, the shield machine is converted from a mud water mode to an adjustable density mode.
2. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the mud water storehouse (3) with the intercommunication department in air cushion storehouse (2) is provided with the check valve, works as mud water storehouse (3) internal pressure is less than when air cushion storehouse (2), mud passes through in the air cushion storehouse (2) the check valve supply extremely mud water storehouse (3).
3. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the shield tunneling machine further comprises a slurry supplementing pipeline (9) with an input end connected with the slurry inlet pipeline (8) and an output end connected to the air cushion bin (2), and when the liquid level in the air cushion bin (2) descends, slurry is supplemented to the air cushion bin (2) through the slurry supplementing pipeline (9), so that the liquid level in the air cushion bin (2) is kept stable.
4. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the shield machine further comprises an air pressure maintaining pipeline (14) of which the output end is connected to the upper part of the air cushion bin (2) so as to convey gas into the air cushion bin (2) to enable the air cushion bin (2) to keep pressure balance, and the tunnel face pressure is adjusted through the air pressure maintaining pipeline (14) and the grout supplementing pipeline (9).
5. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the shield tunneling machine further comprises a dilution pipeline (18) with an input end connected with the slurry inlet pipeline (8) and an output end connected to the slurry box (6), and the slurry box (6) is washed and diluted through the dilution pipeline (18).
6. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the density measuring pipeline (10) comprises a pipeline, a density measuring circulating pump (101) which can enable the slurry in the slurry bin (3) to circulate through the pipeline, and a densimeter which is used for measuring the density of the slurry in the pipeline.
7. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the density of the slurry in the slurry inlet pipeline (8) is 1.05-1.15t/m3。
8. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: the density of the high-density slurry is 1.3-1.5t/m3。
9. The method for converting the working mode of the shield tunneling machine with the adjustable density according to claim 1, wherein: -reducing the flow rate of the sludging injection line (13) and reducing the rotation speed of the screw machine (4) when the measured value is lower than the standard range, and-increasing the flow rate of the sludging injection line (13) and increasing the rotation speed of the screw machine (4) when the measured value is greater than the standard range.
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