CN114165245A - Soil pressure balance and muddy water balance dual-mode shield tunneling conversion method and tunneling method - Google Patents
Soil pressure balance and muddy water balance dual-mode shield tunneling conversion method and tunneling method Download PDFInfo
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- CN114165245A CN114165245A CN202111491740.6A CN202111491740A CN114165245A CN 114165245 A CN114165245 A CN 114165245A CN 202111491740 A CN202111491740 A CN 202111491740A CN 114165245 A CN114165245 A CN 114165245A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 106
- 230000005641 tunneling Effects 0.000 title claims abstract description 105
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 56
- 239000002689 soil Substances 0.000 title claims description 164
- 238000010276 construction Methods 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims description 168
- 238000007599 discharging Methods 0.000 claims description 38
- 239000002002 slurry Substances 0.000 claims description 34
- 239000010802 sludge Substances 0.000 claims description 32
- 239000000440 bentonite Substances 0.000 claims description 26
- 229910000278 bentonite Inorganic materials 0.000 claims description 26
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 7
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000004927 clay Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000007704 transition Effects 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
- E21D9/0642—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
-
- 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
-
- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides an earth pressure balance and muddy water balance dual-mode shield tunneling conversion method and a tunneling method, relates to the field of shield construction, and solves the problems of low stratum adaptability and low tunneling efficiency.
Description
Technical Field
The invention relates to the field of shield construction, in particular to an earth pressure balance and muddy water balance double-mode shield tunneling conversion method and an earth pressure balance and muddy water balance double-mode shield tunneling method.
Background
The stratum conditions along the subway section tunnel are often greatly different, and the earth pressure balance and slurry balance shield tunneling modes are suitable for different stratum conditions. The subway tunnel of the water-rich clay stratum or the sand layer can adopt a mud-water balance tunneling mode, but if the content of fine particles in a soil body is high, the soil particle separation time in slurry is long, the mud-water separation efficiency is low, the tunneling efficiency is low, the construction period is influenced, and the subway tunnel should be switched to a soil pressure tunneling mode in the clay stratum with the high content of fine particles.
At present, in the process of mutual conversion between the earth pressure balance and slurry balance shield tunneling modes, relevant parts and equipment are required to be dismantled or installed, the construction strength is large, the construction time is long, the shield tunneling efficiency cannot be guaranteed, the stratum settlement cannot be controlled, and the adaptability to stratum condition change is poor.
At present, most shield methods adopted in subway tunnel construction are single-mode shield construction, and when the geological conditions of a tunnel change, if the tunneling mode is not changed, the tunneling efficiency of the shield can be influenced or the stratum sedimentation is overlarge, so that the tunneling mode is changed according to the change of the stratum conditions in the tunneling process of the shield tunnel, which is necessary to improve the tunneling efficiency of the shield and effectively control the stratum sedimentation.
Disclosure of Invention
The invention aims to design an earth pressure balance and muddy water balance double-mode shield tunneling conversion method and an earth pressure balance and muddy water balance double-mode shield tunneling method, so that mutual conversion of a muddy water balance mode and an earth pressure balance mode can be completed without dismantling any equipment in the construction process, and therefore, the tunneling method adopting the earth pressure balance and muddy water balance double-mode shield tunneling conversion method in subway tunnel construction has strong stratum adaptability, can change the tunneling mode according to stratum condition changes, improves the shield tunneling efficiency and can effectively control stratum settlement.
The invention is realized by the following technical scheme:
the invention provides a soil pressure balance and muddy water balance double-mode shield tunneling conversion method, which comprises a method for converting from a soil pressure balance mode to a muddy water balance mode, wherein the conversion process comprises the following steps:
a1, starting a cutter head and a screw conveyor, simultaneously injecting bentonite slurry into the soil pressure cabin, tunneling the soil pressure cabin forwards for 20cm, stopping tunneling the soil pressure cabin, and stopping the cutter head and the screw conveyor, wherein the slag outlet amount of the screw conveyor is counted in the process;
a2, starting the cutter head and the screw conveyer to slowly discharge slag at the slag outlet of the screw conveyer, and when the soil pressure at the front end of the cutter head is lower than 0.6bar or the slag discharge amount reaches 6m3Stopping the screw conveyor and closing the slag outlet gate to stop slag discharge, and counting the slag discharge amount at the slag outlet of the screw conveyor in the process;
a3, injecting bentonite slurry into the soil pressure cabin, and balancing the amount of the injected bentonite slurry with the total slag discharge amount in the steps A1 and A2, wherein the soil pressure on the front end of the cutter head is maintained to be not less than 0.6 bar;
a4, injecting bentonite slurry into the soil pressing bin at a constant flow rate continuously, and slowly discharging slag at a slag outlet of the screw conveyor; stopping slag discharging when the slag outlet of the screw conveyor has a gushing phenomenon, then adjusting the screw conveyor to rotate reversely and continue slag discharging, if the slag outlet has the gushing phenomenon, gradually reducing the opening degree of a gate of the slag outlet and continuously discharging slag until the gushing condition of the slag outlet is continuous, stopping slag discharging, and simultaneously stopping the cutter head; in the process, the slag discharge quantity at the slag outlet of the screw conveyor is counted;
a5, connecting a mud-water receiving hopper, and connecting a slag outlet of the screw conveyor with a mud discharge pipeline through a hose;
a6, starting a reverse washing mode, and washing the screw conveyer;
a7, starting a circulation mode, and circularly washing the cutter head and the soil pressing bin;
a8, starting the cutter head and the screw conveyor, opening a slag hole gate, and operating in a normal muddy water mode under the condition of no tunneling; in the process, the slag discharge quantity at the slag outlet of the screw conveyor is counted;
the method for converting the muddy water balance mode into the soil pressure balance mode is also included, and the conversion process comprises the following steps:
b1, starting the cutter head, injecting clear water into the soil pressure bin, starting tunneling, and partially opening a slag outlet gate of the screw conveyor to discharge mud when the soil pressure on the front end of the cutter head reaches 0.16 MPa; when the soil pressure value on the front end of the cutter head is lower than 0.06MPa, closing the slag hole gate, continuously tunneling forwards, and partially opening the slag hole gate of the screw conveyor to continuously discharge the sludge when the soil pressure bin pressure is maintained to be 0.16 MPa; in the process, the mud discharging volume, the mud discharging density, the clear water injection volume and the tunneling length data are recorded in detail, so that overbreak is prevented, and mud is discharged continuously;
b2, gradually increasing the opening of a slag outlet gate of the screw conveyor along with the increase of soil blocks in the muddy water, starting the screw conveyor, closing the slag outlet gate of the screw conveyor until the discharged sludge is large in blocks and can be transported through a belt, removing the muddy water receiving hopper and the hose, and installing the belt of the belt conveyor;
b3, when the pressure of the soil pressure cabin is stabilized at 0.1MPa, partially opening a slag outlet gate of the screw conveyor, continuously discharging slag through the belt conveyor, injecting foam into the soil pressure cabin in the process, and injecting clean water into the soil pressure cabin through a bentonite slurry injection port.
Further: in the step A1, after the cutter head torque is stable, the cutter head is tunneled forwards and slag is discharged.
Further: in step A3, grease is injected into the shield tail for sealing.
Further: in the step A2, the cutter head is operated at 0-0.5r/min, and the rotating speed of the screw conveyor is maintained at 1.5 r/min;
in the step A4, injecting bentonite slurry into the soil pressing bin at a flow rate of 400L/min;
in the step A6, the time for flushing the screw conveyer is 40s, and the sludge discharge pressure at the slag outlet during backwashing is 1.9 bar;
in the step A7, the front end pressure is adjusted by adjusting the opening of the flushing valve in the circulation process, and the sludge discharge concentration is ensured.
Further, in the step A4, bentonite slurry is injected into the soil pressure cabin from two paths, and the flow rate of each path is 200L/min.
Further: in step A8, the cutter head is operated at 0-0.5r/min, and the screw conveyor is operated at 1.5 r/min.
Further: in the step B1, after the cutter head is started and the torque of the cutter head is stable, the cutter head is continuously operated for more than 30s at the rotating speed of 1.2-1.5r/min, and then the tunneling is started;
in the step B1, the tunneling speed is controlled at 20 mm/min.
Further: step B1, sodium carbonate is added into the clean water injected into the soil compaction bin in advance, and the flow of the injected clean water is 30-50L/min;
in step B1, the opening degree of the slag hole gate of the partially opened screw conveyor is controlled to be about 20% (adjusted according to actual conditions).
Further, in the step B1, the soil pressure and the volume of the muddy water in the muddy water receiving hopper are observed during the sludge discharging process, the slag outlet gate of the screw conveyor is closed in advance when the muddy water receiving hopper is nearly full, and the sludge discharging is continued after the muddy water in the muddy water receiving hopper is poured.
Further: in the step B3, the tunneling speed is controlled to be 20-30 mm/min;
in the step B3, the opening degree of a slag hole gate of the partially opened screw conveyor is controlled to be about 40 percent;
in the step B3, the injection flow of the foam is 30-50L/min, so that the slag hole is prevented from being blocked and the slag soil is improved;
and step B3, sodium carbonate is added into the clean water injected into the soil compaction bin in advance, and the flow of the injected clean water is 30-50L/min, so that blockage is prevented.
Further: the method for converting the soil pressure balance mode into the muddy water balance mode further comprises the following steps: a9, when 80% of the accumulated residue soil in the soil pressure bin is discharged or the specific gravity of the discharged sludge meets the construction requirement of a normal sludge-water balance mode, completing the conversion from the soil pressure balance mode to the sludge-water balance mode;
the method for converting the muddy water balance mode into the soil pressure balance mode further comprises the following steps: and B4, when the slag outlet of the screw conveyor is continuous, the conversion of the slag soil replacement slurry in the soil pressure bin is finished, and the subsequent normal construction is carried out according to the soil pressure balance mode.
The invention also provides an earth pressure balance and muddy water balance double-mode shield tunneling method, wherein the conversion of the tunneling mode is carried out between earth pressure balance and muddy water balance by adopting the earth pressure balance and muddy water balance double-mode shield tunneling conversion method in shield tunneling. And after the tunneling mode conversion is completed, the corresponding tunneling mode is adopted to continue tunneling.
The invention has the following advantages and beneficial effects:
(1) according to the invention, the soil pressure balance and muddy water balance dual-mode shield tunneling conversion method can better solve the problem of mode switching between the soil pressure balance mode and the muddy water balance mode, does not need to disassemble any equipment in the conversion process, can realize mode conversion rapidly and safely, and can improve the construction efficiency.
(2) The soil pressure balance and muddy water balance dual-mode shield tunneling method adopts the soil pressure balance and muddy water balance dual-mode shield tunneling conversion method, the soil slag and the mud in the conversion process are conveyed by the screw conveyor, the replacement of the slag soil and the mud in the soil pressure bin is completed, and the mutual conversion of the soil pressure balance mode and the muddy water balance mode can be completed without dismantling any equipment in the construction process, so that the soil pressure balance and muddy water balance dual-mode shield tunneling method has stronger stratum adaptability.
(3) The invention can change the tunneling mode according to the change of the stratum condition so as to improve the tunneling efficiency of the shield and effectively control the stratum settlement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
the soil pressure balance and muddy water balance double-mode shield tunneling conversion method enables mutual conversion of a muddy water balance mode and an soil pressure balance mode to be completed without dismantling any equipment in the construction process, can realize mode conversion rapidly and safely, and can improve the construction efficiency:
the soil pressure balance and muddy water balance dual-mode shield tunneling conversion method comprises a method for converting from a soil pressure balance mode to a muddy water balance mode, and the conversion process comprises the following steps:
a1, starting a cutter head and a screw conveyor, simultaneously injecting bentonite slurry into the soil pressure cabin, tunneling the soil pressure cabin forwards for 20cm, stopping tunneling the soil pressure cabin, and stopping the cutter head and the screw conveyor, wherein the slag outlet amount of the screw conveyor is counted in the process;
a2, starting the cutter head and the screw conveyer to slowly discharge slag at the slag outlet of the screw conveyer, and when the soil pressure at the front end of the cutter head is lower than 0.6bar or the slag discharge amount reaches 6m3Stopping the screw conveyor and closing the slag outlet gate to stop slag discharge, and counting the slag discharge amount at the slag outlet of the screw conveyor in the process;
a3, injecting bentonite slurry into the soil pressure cabin, and balancing the amount of the injected bentonite slurry with the total slag discharge amount in the steps A1 and A2, wherein the soil pressure on the front end of the cutter head is maintained to be not less than 0.6 bar;
a4, injecting bentonite slurry into the soil pressing bin at a constant flow rate continuously, and slowly discharging slag at a slag outlet of the screw conveyor; stopping slag discharging when the slag outlet of the screw conveyor has a gushing phenomenon, then adjusting the screw conveyor to rotate reversely and continue slag discharging, if the slag outlet has the gushing phenomenon, gradually reducing the opening degree of a gate of the slag outlet and continuously discharging slag until the gushing condition of the slag outlet is continuous, stopping slag discharging, and simultaneously stopping the cutter head; in the process, the slag discharge quantity at the slag outlet of the screw conveyor is counted;
a5, connecting a mud-water receiving hopper, and connecting a slag outlet of the screw conveyor with a mud discharge pipeline through a hose;
a6, starting a reverse washing mode, and washing the screw conveyer;
a7, starting a circulation mode, and circularly washing the cutter head and the soil pressing bin;
a8, starting the cutter head and the screw conveyor, opening a slag hole gate, and operating in a normal muddy water mode under the condition of no tunneling; in the process, the slag discharge quantity at the slag outlet of the screw conveyor is counted;
the method for converting the muddy water balance mode into the soil pressure balance mode is also included, and the conversion process comprises the following steps:
b1, starting the cutter head, injecting clear water into the soil pressure bin, starting tunneling, and partially opening a slag outlet gate of the screw conveyor to discharge mud when the soil pressure on the front end of the cutter head reaches 0.16 MPa; when the soil pressure value on the front end of the cutter head is lower than 0.06MPa, closing the slag hole gate, continuously tunneling forwards, and partially opening the slag hole gate of the screw conveyor to continuously discharge the sludge when the soil pressure bin pressure is maintained to be 0.16 MPa; in the process, the mud discharging volume, the mud discharging density, the clear water injection volume and the tunneling length data are recorded in detail, so that overbreak is prevented, and mud is discharged continuously;
b2, gradually increasing the opening of a slag outlet gate of the screw conveyor along with the increase of soil blocks in the muddy water, starting the screw conveyor, closing the slag outlet gate of the screw conveyor until the discharged sludge is large in blocks and can be transported through a belt, removing the muddy water receiving hopper and the hose, and installing the belt of the belt conveyor;
b3, when the pressure of the soil pressure cabin is stabilized at 0.1MPa, partially opening a slag outlet gate of the screw conveyor, continuously discharging slag through the belt conveyor, injecting foam into the soil pressure cabin in the process, and injecting clean water into the soil pressure cabin through a bentonite slurry injection port.
In the embodiment, the soil pressure balance and muddy water balance dual-mode shield tunneling conversion method can better solve the problem of mode switching between the soil pressure balance mode and the muddy water balance mode, does not need to disassemble any equipment in the conversion process, can quickly and safely realize mode conversion, and can improve the construction efficiency.
Example 2:
the embodiment is further optimized on the basis of the embodiment:
in this embodiment, in step a1, after the cutter head torque is stabilized, the cutter head is tunneled forward and the slag is discharged.
In step A2, the cutter head is operated at 0-0.5r/min, and the rotation speed of the screw conveyer is maintained at 1.5 r/min.
In step A3, grease is injected into the shield tail for sealing.
In the step A4, bentonite slurry is injected into the soil compaction bin at a flow rate of 400L/min, specifically, the bentonite slurry is injected into the soil compaction bin from two paths, and the flow rate of each path is 200L/min.
In step A6, the screw conveyor was flushed for 40s, and the sludge discharge pressure at the slag outlet during backwashing was 1.9 bar.
In the step A7, the front end pressure is adjusted by adjusting the opening of the flushing valve in the circulation process, and the sludge discharge concentration is ensured.
In step A8, the cutter head is operated at 0-0.5r/min, and the screw conveyor is operated at 1.5 r/min.
And in the step B1, after the cutter head is started and the torque of the cutter head is stable, the cutter head continuously operates for more than 30s at the rotating speed of 1.2-1.5r/min, and then the tunneling is started.
In the step B1, the tunneling speed is controlled at 20 mm/min.
And step B1, sodium carbonate is added into the clean water injected into the soil pressing bin in advance, and the flow of the injected clean water is 30-50L/min.
In the step B1, the opening degree of a slag hole gate of the partially opened screw conveyor is controlled to be about 20 percent, and the specific opening degree can be adjusted according to the actual situation on site.
In the step B1, the soil pressure and the volume of the muddy water in the muddy water receiving hopper are kept in mind during the sludge discharging process, the slag outlet gate of the screw conveyor is closed in advance when the muddy water receiving hopper is nearly full, and the sludge discharging is continued after the muddy water in the muddy water receiving hopper is poured.
In the step B3, the tunneling speed is controlled to be 20-30 mm/min.
In the step B3, the opening degree of the slag hole gate of the partially opened screw conveyor is controlled to be about 40 percent, and the specific opening degree can be adjusted according to the actual situation on site.
In the step B3, the injection flow rate of the foam is 30-50L/min to prevent the slag hole from being blocked and improve the slag soil.
And step B3, sodium carbonate is added into the clean water injected into the soil pressing bin in advance, and the flow of the injected clean water is 30-50L/min, so that the slag hole is prevented from being blocked.
Example 3:
the embodiment is further optimized on the basis of the embodiment:
in this embodiment, the method for converting the soil pressure balance mode into the mud water balance mode further includes the steps of: and A9, when 80% of the accumulated residue soil in the soil pressure bin is discharged or the specific gravity of the discharged sludge meets the construction requirement of a normal mud-water balance mode, completing the conversion from the soil pressure balance mode to the mud-water balance mode.
The method for converting the muddy water balance mode into the soil pressure balance mode further comprises the following steps: and B4, when the slag outlet of the screw conveyor is continuous, the conversion of the slag soil replacement slurry in the soil pressure bin is finished, and the subsequent normal construction is carried out according to the soil pressure balance mode.
The preferred mode transition completion timing is determined by steps A9 and B4.
Example 4:
the embodiment is further optimized on the basis of the embodiment:
the embodiment also provides an earth pressure balance and muddy water balance dual-mode shield tunneling method, and the conversion of the tunneling mode is carried out between earth pressure balance and muddy water balance by adopting the earth pressure balance and muddy water balance dual-mode shield tunneling conversion method in the embodiment in the shield tunneling.
Specifically, this embodiment provides a better soil pressure balance and slurry balance dual-mode shield tunneling method based on embodiment 3, and performs construction according to a corresponding method when the formation conditions change and the tunneling mode needs to be changed.
The soil pressure balance mode-muddy water balance mode mutual conversion comprises a method for converting from the soil pressure balance mode to the muddy water balance mode and a method for converting from the muddy water balance mode to the soil pressure balance mode, wherein:
the method for converting the soil pressure balance mode into the muddy water balance mode comprises the following steps:
a1, starting the cutter head and the screw conveyor, simultaneously injecting bentonite slurry into the soil pressure cabin, tunneling forwards after the torque of the cutter head is stable, tunneling forwards for 20cm, stopping tunneling, stopping the cutter head and the screw conveyor, and counting the slag discharge amount at the slag outlet of the screw conveyor in the process.
A2, starting the cutter head and the screw conveyer, enabling the cutter head to run at 0-0.5r/min, maintaining the rotating speed of the screw conveyer at 1.5r/min to slowly discharge slag at a slag outlet of the screw conveyer, and when the soil pressure on the front end of the cutter head is lower than 0.6bar or the slag discharge amount reaches 6m3And stopping the screw conveyor and closing the slag outlet gate to stop slag discharging, and counting the slag discharging amount at the slag outlet of the screw conveyor in the process.
A3, injecting bentonite slurry into the soil pressure cabin through the partition plate, and balancing the amount of the injected bentonite slurry with the total slag output in the steps A1 and A2, wherein the soil pressure on the front end of the cutter head is maintained to be not less than 0.6bar, and grease is injected at the shield tail for sealing.
A4, keeping the cutter head running at 0-0.5r/min, continuously injecting bentonite slurry into the soil pressure bin, injecting the bentonite slurry into the soil pressure bin from two ways, wherein the flow rate of each way is 200L/min, and keeping the rotating speed of the screw conveyor running at 1.5r/min to slowly and continuously discharge slag at a slag outlet of the screw conveyor; stopping slag discharging when the slag outlet of the screw conveyor has a gushing phenomenon, then adjusting the screw conveyor to rotate reversely and continue slag discharging, if the slag outlet has the gushing phenomenon, gradually reducing the opening degree of a gate of the slag outlet and continuously discharging slag until the gushing condition of the slag outlet is continuous, stopping slag discharging, and simultaneously stopping the cutter head; and the slag discharge quantity at the slag outlet of the screw conveyor is counted in the process.
A5, connecting a mud-water receiving hopper, and connecting a slag outlet of the screw conveyor with a mud discharge pipeline through a hose.
A6, starting a backwashing mode, flushing the screw conveyer, wherein the time for flushing the screw conveyer is 40s, and the sludge discharge pressure at a slag outlet during backwashing is 1.9 bar.
A7, starting a circulation mode, circularly washing the cutter head and the soil pressure bin, and adjusting the front end pressure and ensuring the sludge discharge concentration by adjusting the opening of a washing valve in the circulation process.
A8, starting the cutter head and the screw conveyor, opening a slag outlet gate, enabling the cutter head to operate at 0-0.5r/min, enabling the screw conveyor to operate at 1.5r/min, and adopting a normal muddy water mode to operate under the condition of no tunneling so as to discharge residual muck in the soil pressing bin through a mud discharge pipeline; and the slag discharge quantity at the slag outlet of the screw conveyor is counted in the process.
And A9, when 80% of the accumulated residue soil in the soil pressure bin is discharged or the specific gravity of the discharged sludge meets the construction requirement of a normal muddy water balance mode, completing the conversion from the soil pressure balance mode to the muddy water balance mode, and then performing normal construction and tunneling according to the soil pressure balance mode.
During the construction process of converting the soil pressure balance mode into the muddy water balance mode, the slag amount needs to be strictly counted, and a specially-assigned person is assigned to measure and calculate and make detailed records. And in the residue soil replacement process, the ground position of the shield machine needs to be enhanced for settlement monitoring and safety inspection.
The method for converting the muddy water balance mode into the soil pressure balance mode comprises the following steps:
b1, starting the cutter head, after the torque of the cutter head is stable, enabling the cutter head to continuously operate for more than 30s at the rotating speed of 1.2-1.5r/min, then starting tunneling, injecting clear water into the soil pressure bin (sodium carbonate is added into the clear water in advance, the flow of the injected clear water is 30-50L/min), starting tunneling, controlling the tunneling speed at 20mm/min, when the soil pressure on the front end of the cutter head reaches 0.16MPa, opening a slag outlet gate of the spiral conveyor and controlling the opening degree of the slag outlet gate to be about 20% for discharging mud (the specific opening degree can be adjusted according to the actual situation on site); when the soil pressure value on the front end of the cutter head is lower than 0.06MPa, closing the slag hole gate, continuously tunneling forwards, and partially opening the slag hole gate of the screw conveyor to continuously discharge the sludge when the soil pressure bin pressure is maintained to be 0.16 MPa; in the process, the mud discharging volume, the mud discharging density, the clear water injection volume and the tunneling length data are recorded in detail, so that overbreak is prevented, and mud is discharged continuously; and in the sludge discharging process, the soil feeding pressure and the volume of the sludge water in the sludge water receiving hopper are kept, the slag outlet gate of the screw conveyor is closed in advance when the sludge water receiving hopper is nearly full, and the sludge is continuously discharged after the sludge water in the sludge water receiving hopper is poured.
B2, gradually increasing the opening of a slag hole gate of the screw conveyor along with the increase of soil blocks in the muddy water, starting the screw conveyor, closing the slag hole gate of the screw conveyor until the discharged sludge blocks become more and the sludge can be transported through a belt, removing the muddy water receiving hopper and the hose, and installing the belt of the belt conveyor.
And B3, continuously maintaining the operation of the cutter head and the screw conveyor to drive, enabling the cutter head to rotate at a speed of 1.2-1.5r/min, controlling the driving speed to be 20-30mm/min, opening a slag outlet gate of the screw conveyor and controlling the opening degree of the slag outlet gate to be about 40% (the specific opening degree can be adjusted according to the actual situation on site) when the pressure of the soil pressure bin is stabilized at 0.1MPa, continuously discharging slag through the belt conveyor, injecting foam with the flow rate of 30-50L/min into the soil pressure bin in the process to prevent the slag outlet from being blocked and improve the slag soil, and injecting clean water into the soil pressure bin through a bentonite slurry injection port to prevent the slag outlet from being blocked (sodium carbonate is added into the clean water in advance, and the flow rate of the injected clean water is 30-50L/min).
And B4, when the slag outlet of the screw conveyor is continuous, the conversion of the slag soil replacement slurry in the soil pressure bin is finished, and the subsequent normal construction tunneling is carried out according to the soil pressure balance mode.
The soil pressure balance and muddy water balance double-mode shield tunneling method adopts a soil pressure balance and muddy water balance double-mode shield tunneling conversion method, soil slag and mud in the soil pressure bin are conveyed by the screw conveyor in the conversion process, replacement of the soil slag and the mud in the soil pressure bin is completed, and mutual conversion of a soil pressure balance mode and a muddy water balance mode can be completed without dismantling any equipment in the construction process, so that the soil pressure balance and muddy water balance double-mode shield tunneling method has strong stratum adaptability. The invention can change the tunneling mode according to the change of the stratum condition so as to improve the tunneling efficiency of the shield and effectively control the stratum settlement.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. The soil pressure balance and muddy water balance double-mode shield tunneling conversion method is characterized by comprising the following steps of: the method comprises the step of converting the soil pressure balance mode into the muddy water balance mode, wherein the conversion process comprises the following steps:
a1, starting a cutter head and a screw conveyor, simultaneously injecting bentonite slurry into the soil pressure cabin, tunneling the soil pressure cabin forwards for 20cm, stopping tunneling the soil pressure cabin, and stopping the cutter head and the screw conveyor, wherein the slag outlet amount at a slag outlet is counted in the process;
a2, starting the cutter head and the screw conveyer to slowly discharge the slag at the slag outlet, and when the soil pressure at the front end of the cutter head is lower than 0.6bar or the slag discharge amount reaches 6m3Stopping slag discharge, and counting the slag discharge amount at the slag discharge port in the process;
a3, injecting bentonite slurry into the soil pressure cabin, and balancing the amount of the injected bentonite slurry with the total slag discharge amount in the steps A1 and A2, wherein the soil pressure on the front end of the cutter head is maintained to be not less than 0.6 bar;
a4, injecting bentonite slurry into the soil pressing bin at a constant flow rate continuously, and slowly discharging slag at a slag outlet; stopping slag discharging when the slag hole is just gushed, then regulating the screw conveyor to rotate reversely and continue to discharge slag, if the slag hole still has the gushing phenomenon, gradually reducing the opening of a gate of the slag hole and continuously discharging slag until the gushing condition of the slag hole is continuous, stopping slag discharging, and simultaneously stopping the cutter head; counting the slag outlet quantity at the slag outlet in the process;
a5, connecting a mud-water receiving hopper, and connecting a slag outlet with a mud discharge pipeline through a hose;
a6, starting a reverse washing mode, and washing the screw conveyer;
a7, starting a circulation mode, and circularly washing the cutter head and the soil pressing bin;
a8, starting the cutter head and the screw conveyor, opening a slag hole gate, and operating in a normal muddy water mode under the condition of no tunneling; counting the slag outlet quantity at the slag outlet in the process;
the method for converting the muddy water balance mode into the soil pressure balance mode is also included, and the conversion process comprises the following steps:
b1, starting the cutter head, injecting clear water into the soil pressure bin, starting tunneling, and partially opening the slag hole gate to discharge mud when the soil pressure reaches 0.16 MPa; when the soil loading pressure value is lower than 0.06MPa, closing the slag hole gate, continuously tunneling forwards, and partially opening the slag hole gate to continuously discharge the mud when the soil loading pressure is maintained to be 0.16 MPa; in the process, the mud discharging volume, the mud discharging density, the clear water injection volume and the tunneling length data are recorded in detail, so that overbreak is prevented, and mud is discharged continuously;
b2, gradually increasing the opening of the slag hole gate along with the increase of soil blocks in the muddy water, starting the screw conveyor, closing the slag hole gate until the large blocks of the discharged sludge become more and the sludge can be transported through the belt, removing the muddy water receiving hopper and the hose, and installing the belt of the belt conveyor;
b3, when the pressure of the soil pressing bin is stabilized at 0.1MPa, partially opening a slag outlet gate, continuously discharging slag through a belt conveyor, injecting foam into the soil pressing bin in the process, and injecting clear water into the soil pressing bin through a bentonite slurry injection port.
2. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 1, characterized in that: in the step A1, after the cutter head torque is stable, the cutter head is tunneled forwards and slag is discharged.
3. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 1, characterized in that: in step A3, grease is injected into the shield tail for sealing.
4. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 1, characterized in that:
in the step A2, the cutter head is operated at 0-0.5r/min, and the rotating speed of the screw conveyor is 1.5 r/min;
in the step A4, injecting bentonite slurry into the soil pressing bin at a flow rate of 400L/min;
in the step A6, the time for flushing the screw conveyer is 40s, and the sludge discharge pressure at the slag outlet during backwashing is 1.9 bar;
in the step A7, the front end pressure is adjusted by adjusting the opening of the flushing valve in the circulation process, and the sludge discharge concentration is ensured.
5. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 4, characterized in that: in step A8, the cutter head is operated at 0-0.5r/min, and the screw conveyor is operated at 1.5 r/min.
6. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 1, characterized in that: in the step B1, after the cutter head is started and the torque of the cutter head is stable, the cutter head is continuously operated for more than 30s at the rotating speed of 1.2-1.5r/min, and then the tunneling is started;
in the step B1, the tunneling speed is controlled at 20 mm/min.
7. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 1, characterized in that: step B1, sodium carbonate is added into the clean water injected into the soil compaction bin in advance, and the flow of the injected clean water is 30-50L/min;
in step B1, the opening of the partially opened slag hole gate is controlled to be about 20%.
8. The soil pressure balance and muddy water balance dual-mode shield tunneling conversion method according to claim 7, characterized in that: in the step B3, the tunneling speed is controlled to be 20-30 mm/min;
in the step B3, the opening degree of the partially opened slag hole gate is controlled to be about 40 percent;
in the step B3, the injection flow rate of the foam is 30-50L/min;
and step B3, sodium carbonate is added into the clean water injected into the soil pressing bin in advance, and the flow of the injected clean water is 30-50L/min.
9. The earth pressure balance and muddy water balance dual-mode shield tunneling conversion method according to any one of claims 1-8, characterized in that: the method for converting the soil pressure balance mode into the muddy water balance mode further comprises the following steps: a9, when 80% of the accumulated residue soil in the soil pressure bin is discharged or the specific gravity of the discharged sludge meets the construction requirement of a normal sludge-water balance mode, completing the conversion from the soil pressure balance mode to the sludge-water balance mode;
the method for converting the muddy water balance mode into the soil pressure balance mode further comprises the following steps: and B4, when the slag outlet of the screw conveyor is continuous, the conversion of the slag soil replacement slurry in the soil pressure bin is finished, and the subsequent normal construction is carried out according to the soil pressure balance mode.
10. The earth pressure balance and muddy water balance double-mode shield tunneling method is characterized in that: the soil pressure balance and muddy water balance double-mode shield tunneling conversion method is adopted to carry out tunneling mode conversion between soil pressure balance and muddy water balance in shield tunneling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025374A (en) * | 2023-01-04 | 2023-04-28 | 中交第二航务工程局有限公司 | Soil pressure-muddy water dual-mode shield deslagging construction method based on screw conveyor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203961986U (en) * | 2014-06-19 | 2014-11-26 | 广东省基础工程公司 | A kind of mud and water balance and earth pressure balanced reinforced plastic composite jack pipe machine |
| CN104695969A (en) * | 2015-02-28 | 2015-06-10 | 广东华隧建设股份有限公司 | Method for switching slurry tunneling mode to earth pressure tunneling mode of shield tunneling machine |
| CN104775826A (en) * | 2015-02-28 | 2015-07-15 | 广东华隧建设股份有限公司 | Continuous switching construction method of muddy water soil pressure double-mode type shield |
| CN109505617A (en) * | 2018-12-28 | 2019-03-22 | 中铁工程装备集团有限公司 | A kind of rock tunnel(ling) machine |
| CN109723452A (en) * | 2018-11-22 | 2019-05-07 | 上海隧道工程有限公司 | A kind of mud and water balance earth pressure balance bi-mode intelligent pipe jacking tunnelling machine |
| CN111219194A (en) * | 2020-03-20 | 2020-06-02 | 中铁隧道局集团有限公司 | Slurry/soil pressure dual-mode shield and tunneling mode conversion method thereof |
| CN111997631A (en) * | 2020-10-14 | 2020-11-27 | 中铁工程装备集团有限公司 | Tunnel construction method and shield tunneling machine |
-
2021
- 2021-12-08 CN CN202111491740.6A patent/CN114165245A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203961986U (en) * | 2014-06-19 | 2014-11-26 | 广东省基础工程公司 | A kind of mud and water balance and earth pressure balanced reinforced plastic composite jack pipe machine |
| CN104695969A (en) * | 2015-02-28 | 2015-06-10 | 广东华隧建设股份有限公司 | Method for switching slurry tunneling mode to earth pressure tunneling mode of shield tunneling machine |
| CN104775826A (en) * | 2015-02-28 | 2015-07-15 | 广东华隧建设股份有限公司 | Continuous switching construction method of muddy water soil pressure double-mode type shield |
| CN109723452A (en) * | 2018-11-22 | 2019-05-07 | 上海隧道工程有限公司 | A kind of mud and water balance earth pressure balance bi-mode intelligent pipe jacking tunnelling machine |
| CN109505617A (en) * | 2018-12-28 | 2019-03-22 | 中铁工程装备集团有限公司 | A kind of rock tunnel(ling) machine |
| CN111219194A (en) * | 2020-03-20 | 2020-06-02 | 中铁隧道局集团有限公司 | Slurry/soil pressure dual-mode shield and tunneling mode conversion method thereof |
| CN111997631A (en) * | 2020-10-14 | 2020-11-27 | 中铁工程装备集团有限公司 | Tunnel construction method and shield tunneling machine |
Non-Patent Citations (1)
| Title |
|---|
| 林向阳等: ""富水粉质黏土地层土压平衡和泥水平衡盾构掘进模式转换试验研究"" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116025374A (en) * | 2023-01-04 | 2023-04-28 | 中交第二航务工程局有限公司 | Soil pressure-muddy water dual-mode shield deslagging construction method based on screw conveyor |
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