CN107091100B - Antifriction system of rectangle push bench - Google Patents
Antifriction system of rectangle push bench Download PDFInfo
- Publication number
- CN107091100B CN107091100B CN201710432881.8A CN201710432881A CN107091100B CN 107091100 B CN107091100 B CN 107091100B CN 201710432881 A CN201710432881 A CN 201710432881A CN 107091100 B CN107091100 B CN 107091100B
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- foam
- conveying
- liquid
- mixed liquid
- air supply
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- 239000006260 foam Substances 0.000 claims abstract description 111
- 239000007788 liquid Substances 0.000 claims abstract description 103
- 238000001514 detection method Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 229910000278 bentonite Inorganic materials 0.000 claims description 29
- 239000000440 bentonite Substances 0.000 claims description 29
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 29
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 238000005086 pumping Methods 0.000 claims description 16
- 239000002689 soil Substances 0.000 claims description 14
- 239000011259 mixed solution Substances 0.000 claims description 12
- 239000011550 stock solution Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 6
- 238000012546 transfer Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
- E21D9/08—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
Landscapes
- 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 provides an antifriction system of a rectangular pipe pushing jack, which comprises a foam generating device, wherein the foam generating device comprises a first controller, an air supply assembly, a foam mixed liquid conveying assembly and a gas-liquid mixing assembly for mixing air supply gas and foam mixed liquid, the air supply assembly comprises a first flowmeter for detecting air supply gas flow and a flow valve for adjusting air supply gas flow, the foam mixed liquid conveying assembly comprises a first conveying pump for conveying foam mixed liquid, and the first controller respectively sends control instructions to the flow valve and the first conveying pump according to detection signals of the first flowmeter to control air supply gas output flow and conveying amount of the foam mixed liquid. The invention has the advantages of accurate control, simplicity, reliability, service life and the like.
Description
Technical Field
The invention relates to the technical field of push bench, in particular to an antifriction system of a rectangular push bench.
Background
Along with the development of domestic underground engineering, the existing subway entrance pedestrian passageway and street underground pedestrian passageway are increasingly constructed by adopting shield push bench. Because the effective use area of the rectangular section is about 20% larger than that of the circular section, the conventional shield push bench adopts the rectangular section to ensure that the tunnel utilization space is economical and reasonable, but the construction geology is complex, and the problem that the ballast soil needs to be improved exists. The existing mode adopts foam to improve the abrasion and soil pressure performance of a cutter head, but the existing rectangular pipe pushing jack antifriction system has the following problems: 1. the foam generating device adopts closed-loop control, and flow control feedback is required to be arranged on each path, so that the control is complex, the foam has certain corrosiveness, and the requirement of arranging a plurality of paths of flow detectors on the corrosion resistance of materials is high, and the cost is high; 2. in the propelling process, the pipe joint of the push bench and the periphery of the soil layer are worn greatly, and the running reliability and the safety of equipment are low.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the antifriction system of the rectangular push bench, which is accurate in control, simple and reliable and has a long service life.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides an antifriction system of rectangle push bench, includes foam generating device, foam generating device includes first controller, air feed subassembly, foam mixed liquor conveying component and is used for the gas-liquid mixing component with air feed gas and foam mixed liquor mixture, air feed subassembly is including the first flowmeter that is used for detecting air feed gas flow and the flow valve that is used for adjusting air feed gas flow, foam mixed liquor conveying component is including the first delivery pump that is used for carrying foam mixed liquor, first controller sends control command respectively for flow valve and first delivery pump according to the detected signal of first flowmeter, control air feed gas output flow and foam mixed liquor's delivery volume.
As a further improvement of the above technical scheme:
the air supply assembly further comprises an air supply pipeline, a filtering pressure reducing valve and a pressure gauge for detecting air supply pressure, wherein the pressure gauge, the flow valve and the first flow gauge are arranged on the air supply pipeline and are positioned at the downstream of the filtering pressure reducing valve.
The foam mixed liquid conveying assembly further comprises a mixed liquid conveying pipeline and a flow indicator, wherein the flow indicator is arranged on the mixed liquid conveying pipeline and is positioned at the downstream of the first conveying pump.
And the gas supply pipeline and the mixed liquid conveying pipeline are respectively provided with a stop valve for controlling the on-off of the pipeline and a check valve for preventing the gas and the liquid from flowing backwards.
The foam generating device further comprises a foam mixed liquid generating assembly, the foam mixed liquid generating assembly comprises a second controller, a water supply unit, a foam raw liquid conveying unit and a mixed liquid generating unit for mixing the foam raw liquid with water, the water supply unit comprises a second flowmeter for detecting water flow, the foam raw liquid conveying unit comprises a second conveying pump for conveying the foam raw liquid, and the second controller sends a control instruction to the second conveying pump according to a detection signal of the second flowmeter to control conveying quantity of the foam raw liquid.
The water supply unit further comprises a water supply pipeline, the foam stock solution conveying unit further comprises a stock solution conveying pipeline, the water supply pipeline is communicated with the mixed solution generating unit through a communication pipeline, and a filter for filtering the foam mixed solution is arranged on the communication pipeline.
The water supply pipeline and the stock solution conveying pipeline are respectively provided with a ball valve for controlling the on-off of the pipeline and a check valve for preventing liquid from flowing backwards, and the check valve is arranged at the downstream of the ball valve.
The mixed liquor generating unit comprises a foam mixed liquor storage tank and three groups of limit switches for detecting the liquid level of the foam mixed liquor, wherein the three groups of limit switches comprise a first liquid level switch for preventing the foam mixed liquor from overflowing, a second liquid level switch for ensuring the foam mixed liquor storage tank to store normal liquid level and a third liquid level switch for preventing the first conveying pump from idling, which are sequentially arranged from top to bottom along the side wall of the foam mixed liquor storage tank.
The bentonite pumping device is arranged in the middle shield of the pipe jacking machine and is positioned at the upper half part of the middle shield.
The bentonite pumping device comprises a plurality of radial injection holes, a flow guide channel and a plurality of flow guide strips, wherein the radial injection holes are circumferentially arranged along the upper half part of the middle shield, the flow guide channel is arranged at the radial injection holes, the flow guide strips are circumferentially arranged along the upper half part of the middle shield in the flow guide channel, the flow guide channel is arranged along the direction from the middle shield to the tail shield, and the flow guide strips are parallel to the tunneling direction of the rectangular push bench.
Compared with the prior art, the invention has the advantages that:
the invention adopts the flowmeter to detect the air supply flow, and realizes the accurate control of the injection amount of the foam mixed liquid through the detection and feedback of the air flow, namely, the injection amount of the foam mixed liquid and the air supply flow are in open loop control, and the air supply flow is realized by a group of flowmeters for detecting the air flow, thereby effectively avoiding the condition that the closed loop control is adopted and the flow control feedback is required to be arranged in each path, effectively reducing the complexity of the system and having simple and reliable control; meanwhile, the set of flowmeter effectively reduces the replacement cost of the flowmeter in a corrosive environment, and the service life of the equipment is long.
The invention further adopts the bentonite pumping device to pump bentonite slurry between the pipe piece and the soil layer, plays a role in lubricating and protecting the shield shell and the soil layer, further reduces abrasion of pipe joints in the propelling process, effectively protects the pipe joints, improves the safety and reliability of equipment operation, and simultaneously, can effectively fill the clearance between the pipe pieces by utilizing the expansibility of the bentonite, and plays a role in preventing the stratum from loosening and supporting the solidified soil body. The bentonite pumping device further comprises a flow guide channel and a flow guide strip, wherein the flow guide channel ensures that bentonite slurry is diffused along the middle shield to the tail shield, and plays a role in protecting the outer shell of the shield; meanwhile, the flow guide strips are parallel to the tunneling direction of the rectangular pipe jacking machine, and the diffusion of bentonite slurry between a soil layer and a shield body gap is accelerated before the slurry is solidified by utilizing the surface tension of fluid, so that the bentonite slurry is uniformly distributed between a shield body shell and the soil layer, and the subsequent construction is facilitated.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic structural view of a foam generating apparatus of the present invention.
FIG. 2 is a schematic structural view of a foam mix generating assembly of the present invention.
Fig. 3 is a schematic structural diagram of the bentonite pumping device of the present invention in a specific application.
Fig. 4 is an enlarged schematic view of a portion a of fig. 3.
FIG. 5 is a schematic distribution of the deflector strip of the present invention.
The reference numerals in the drawings denote:
1. a gas supply assembly; 11. a first flowmeter; 12. a flow valve; 13. an air supply duct; 14. a filter pressure reducing valve; 15. a pressure gauge; 2. a foam mixed liquor conveying assembly; 21. a first transfer pump; 22. a mixed liquid conveying pipeline; 23. a flow indicator; 3. a gas-liquid mixing assembly; 4. a stop valve; 5. a one-way valve; 6. a foam mixture generating assembly; 61. a water supply unit; 611. a second flowmeter; 612. a water supply pipe; 613. pneumatic ball valves; 62. a foam stock solution conveying unit; 621. a second transfer pump; 622. a stock solution conveying pipeline; 623. a foam raw liquid tank; 624. a fourth limit switch; 63. a mixed liquid generating unit; 631. a foam mixed liquid storage tank; 632. a first liquid level switch; 633. a second liquid level switch; 634. a third liquid level switch; 64. a communication pipe; 65. a filter; 66. a ball valve; 67. a check valve; 7. a bentonite pumping device; 71. a radial injection hole; 72. a diversion channel; 73. a flow guiding strip; 8. middle shield; 9. tail shield; 10. and a valve body.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the invention.
As shown in fig. 1, the antifriction system of the rectangular push bench of the present embodiment includes a foam generating device, the foam generating device includes a first controller, a gas supply assembly 1, a foam mixed liquid conveying assembly 2 and a gas-liquid mixing assembly 3, wherein the gas supply assembly 1 includes a first flowmeter 11 for detecting a flow rate of gas supply and a flow valve 12 for adjusting the flow rate of gas supply, the foam mixed liquid conveying assembly 2 includes a first conveying pump 21 for conveying foam mixed liquid, and the gas-liquid mixing assembly 3 is used for mixing gas supply and foam mixed liquid. In this embodiment, the first controller sends control instructions to the flow valve 12 and the first transfer pump 21 according to the detection signal of the first flow meter 11, respectively, to control the supply gas output flow rate and the transfer amount of the foam mixture. The invention adopts the first flowmeter 11 to detect the air supply flow, and realizes the accurate control of the injection quantity of the foam mixed liquid through the detection and feedback of the air flow, namely, the injection quantity of the foam mixed liquid and the air supply flow ratio are controlled in an open loop mode, and the air supply flow ratio is realized by a group of flowmeters for detecting the air flow, thereby effectively avoiding the condition that the closed loop control is adopted and the flow control feedback is required to be arranged in each path, effectively reducing the complexity of the system and having simple and reliable control; meanwhile, the set of flowmeter effectively reduces the replacement cost of the flowmeter in a corrosive environment, and the service life of the equipment is long.
In this embodiment, timely feedback of the air demand by the first flowmeter 11 is a basis for ensuring that the system realizes open loop control and follows, the first controller transmits a detection signal of the first flowmeter 11 to the flow valve 12 to adjust the switching value of the flow valve, and simultaneously controls the rotation speed of the variable frequency motor of the first delivery pump 21 to adjust the pumping of the foam mixed liquid, so as to finally realize accurate proportioning of the foam mixed liquid and compressed air. In the embodiment, the ratio of the compressed air to the foam mixed liquid is 1:8-25 according to the dosage of the foam mixed liquid required by the expansion ratio.
In this embodiment, the gas supply assembly 1 further includes a gas supply pipe 13, a filter pressure reducing valve 14, and a pressure gauge 15 for detecting the pressure of the supplied gas. Wherein, two ends of the air supply pipeline 13 are respectively communicated with an air supply source and the air-liquid mixing assembly 3; the filter pressure reducing valve 14 is used for pretreating the supplied gas to remove air impurities and provide a stable pressure value. In this embodiment, the pressure gauge 15, the flow valve 12, the filter pressure reducing valve 14 and the first flowmeter 11 are all disposed on the gas supply pipe 13, and the flow valve 12, the pressure gauge 15 and the first flowmeter 11 are all located downstream of the filter pressure reducing valve 14 to perform pressure adjustment and detection on the stable gas supply.
In this embodiment, the foam mixed liquor delivery assembly 2 further includes a mixed liquor delivery conduit 22 and a flow indicator 23. Wherein, two ends of the mixed liquor conveying pipeline 22 are respectively communicated with the foam mixed liquor generating component 6 and the gas-liquid mixing component 3; the flow indicator 23 is provided on the mixed liquid delivery pipe 22 downstream of the first delivery pump 21 for monitoring the injection amount of the foam mixed liquid in real time.
In this embodiment, the air supply pipe 13 and the mixed liquid conveying pipe 22 are provided with a stop valve 4 and a check valve 5. The two stop valves 4 are respectively arranged at the liquid inlet end and the liquid outlet end of the pipeline and used for controlling the integral on-off of the pipeline, so that the pipeline is convenient to maintain; the check valve 5 is arranged at the downstream of the stop valve 4 at the liquid outlet end and is used for preventing the gas and the liquid from flowing backwards. In this embodiment, the stop valve 4 is a ball valve, and the check valve 5 is a vertical check valve.
In this embodiment, foam mixed liquid and compressed air in the gas-liquid mixing assembly 3 are fully mixed and then the produced foam is injected into the push bench, so that smooth discharge of dregs is ensured, stability of a digging surface is ensured, the soil subjected to foam adjustment has good fluidity, plasticity and waterproof permeability, the soil range of digging of the push bench is enlarged, meanwhile, the torque of a cutter head is greatly reduced, and the abrasion of a cutter is reduced. In this embodiment, the output end of the gas-liquid mixing assembly 3 is provided with a pressure regulating valve for regulating the output quantity of foam and a ball check valve for controlling the output of foam.
As shown in fig. 2, in the present embodiment, the foam generating apparatus further includes a foam mixed liquid generating unit 6, and the foam mixed liquid generating unit 6 includes a second controller, a water supply unit 61, a foam raw liquid transporting unit 62, and a mixed liquid generating unit 63 for mixing the foam raw liquid with water. Wherein the water supply unit 61 comprises a second flowmeter 611 for detecting water flow rate, the foam concentrate conveying unit 62 comprises a second conveying pump 621 for conveying the foam concentrate, and the second controller sends a control command to the second conveying pump 621 according to a detection signal of the second flowmeter 611 to control the conveying amount of the foam concentrate. Specifically, after the mixing ratio of the foam stock solution and the water is determined, the system enters a working state, at this time, the water supply unit 61 starts to supply water, and the water flow is detected by the second flowmeter 611, the controller determines the required foam stock solution amount according to the ratio and transmits a signal to the second conveying pump 621, the motor of the second conveying pump 621 drives the variable frequency to adjust the rotating speed of the second conveying pump 621, the detected result is compensated, and then the accurate control of the ratio of the mixed solution is realized, and the control is convenient and the ratio reliability is high. In the embodiment, the ratio of the foam stock solution to the water is 0.8-5%.
In this embodiment, the water supply unit 61 further includes a water supply pipe 612, the foam concentrate delivery unit 62 further includes a concentrate delivery pipe 622, the water supply pipe 612 and the concentrate delivery pipe 622 are connected to the mixed liquor generating unit 63 through a connecting pipe 64, and a filter 65 is disposed on the connecting pipe 64, where the filter 65 is used for pre-treating the foam mixed liquor to remove large particle impurities in the foam mixed liquor.
In the embodiment, the water supply pipeline 612 and the stock solution conveying pipeline 622 are respectively provided with a ball valve 66 and a check valve 67, and the ball valve 66 is arranged at the liquid inlet end of the pipeline and is used for controlling the on-off of the pipeline, so that the pipeline is convenient to maintain; a check valve 67 is provided downstream of the ball valve 66 for preventing the reverse flow of the liquid. In the present embodiment, the second flowmeter 611 is provided between the ball valve 66 and the check valve 67, and the second transfer pump 621 is provided between the ball valve 66 and the check valve 67.
In this embodiment, the pneumatic ball valve 613 is disposed at the upstream of the ball valve 66 of the water supply pipe 612, the mixed solution generating unit 63 includes a foam mixed solution storage tank 631 and three sets of limit switches, the foam mixed solution storage tank 631 is used for temporarily storing foam mixed solution formed by mixing foam raw solution with water, the three sets of limit switches include a first liquid level switch 632, a second liquid level switch 633 and a third liquid level switch 634 which are sequentially disposed along the side wall of the foam mixed solution storage tank 631 from top to bottom, wherein the first liquid level switch 632 and the second liquid level switch 633 are connected with a third controller capable of sending control instructions to the pneumatic ball valve 613, which effectively prevents overflow of the foam mixed solution, ensures that the foam mixed solution storage tank 631 stores normal liquid level, and the third liquid level switch 634 is used for preventing idle running of the first conveying pump 21. In this embodiment, the foam concentrate conveying unit 62 includes a foam concentrate tank 623, and a fourth limit switch 624 is disposed on the foam concentrate tank 623, where the fourth limit switch 624 is used to detect the level of the foam concentrate.
As shown in fig. 3 to 5, in this embodiment, the antifriction system of the rectangular push bench further includes a bentonite pumping device 7, the bentonite pumping device 7 is disposed at the upper half of the middle shield 8 of the push bench, that is, bentonite is actively injected into the upper half of the middle shield 8, so that the phenomenon that no fluid is worn and big on the upper half of the shield body is avoided.
In this embodiment, the bentonite pumping device 7 includes a diversion channel 72, a plurality of radial injection holes 71 and a plurality of diversion bars 73. Wherein, a plurality of radial injection holes 71 are arranged along the circumferential direction of the upper half part of the middle shield 8, bentonite is pumped out through the radial injection holes 71, and pumping between the pipe piece and the soil layer is realized; the diversion channel 72 is arranged at the radial injection hole 71 and is arranged along the direction from the middle shield 8 to the tail shield 9, so that the bentonite slurry is ensured to diffuse towards the tail shield 9 along the diversion channel 72, and the effect of effectively protecting the shield body is achieved; the plurality of guide strips 73 are circumferentially arranged along the upper half part of the middle shield 8, the guide strips 73 are arranged in the guide channels 72, the guide strips 73 are parallel to the tunneling direction of the rectangular pipe jacking machine, and the diffusion of bentonite slurry between a soil layer and a shield body gap is accelerated before the slurry is solidified by utilizing the surface tension of fluid, so that the bentonite slurry is uniformly distributed between a shield body shell and the soil layer, and the subsequent construction is facilitated. In other embodiments, bentonite pumping device 7 may also inject bentonite into the front of the cutterhead, depending on the geological conditions of the formation.
In this embodiment, the radial injection hole 71 is provided with a valve body 10 for controlling the injection of bentonite, the injection speed of bentonite is matched with the pushing speed, the injection pressure is monitored by a pressure sensor, and the injection and injection amount of bentonite are controlled by the valve body 10, and in other embodiments, the injection and injection amount of bentonite can also be controlled manually.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (7)
1. The antifriction system of the rectangular push bench is characterized by comprising a foam generating device, wherein the foam generating device comprises a first controller, an air supply assembly, a foam mixed liquid conveying assembly and a gas-liquid mixing assembly for mixing air supply gas and foam mixed liquid, the air supply assembly comprises a first flowmeter for detecting air supply gas flow and a flow valve for adjusting air supply gas flow, the foam mixed liquid conveying assembly comprises a first conveying pump for conveying foam mixed liquid, the first controller respectively sends control instructions to the flow valve and the first conveying pump according to detection signals of the first flowmeter to control air supply gas output flow and conveying amount of the foam mixed liquid,
the foam generating device also comprises a foam mixed liquid generating component, the foam mixed liquid generating component comprises a second controller, a water supply unit, a foam raw liquid conveying unit and a mixed liquid generating unit for mixing the foam raw liquid with water, the water supply unit comprises a second flowmeter for detecting water flow, the foam raw liquid conveying unit comprises a second conveying pump for conveying the foam raw liquid, the second controller sends a control command to the second conveying pump according to a detection signal of the second flowmeter to control the conveying amount of the foam raw liquid,
the water supply unit also comprises a water supply pipeline, the foam stock solution conveying unit also comprises a stock solution conveying pipeline, the water supply pipeline is communicated with the stock solution conveying pipeline and the mixed solution generating unit through a communication pipeline, a filter for filtering the foam mixed solution is arranged on the communication pipeline,
the mixed liquid generating unit comprises a foam mixed liquid storage tank and three groups of limit switches for detecting the liquid level of the foam mixed liquid, wherein the three groups of limit switches comprise a first liquid level switch for preventing the foam mixed liquid from overflowing, a second liquid level switch for ensuring the foam mixed liquid storage tank to store normal liquid level and a third liquid level switch for preventing the first conveying pump from idling, which are sequentially arranged from top to bottom along the side wall of the foam mixed liquid storage tank.
2. The antifriction system of the rectangular push bench of claim 1, wherein the air supply assembly further comprises an air supply line, a filter pressure reducing valve, and a pressure gauge for detecting the pressure of the air supply gas, the pressure gauge, the flow valve, and the first flow gauge being disposed on the air supply line downstream of the filter pressure reducing valve.
3. The antifriction system of the rectangular push bench of claim 2 wherein the foam mixed liquor delivery assembly further comprises a mixed liquor delivery conduit and a flow indicator disposed on the mixed liquor delivery conduit downstream of the first delivery pump.
4. The antifriction system of the rectangular push bench according to claim 3, wherein the gas supply pipeline and the mixed liquid conveying pipeline are provided with a stop valve for controlling the on-off of the pipeline and a check valve for preventing the gas-liquid backflow.
5. The antifriction system of the rectangular push bench according to any one of claims 1 to 4, wherein ball valves for controlling on-off of the pipelines and check valves for preventing backflow of the liquid are provided on the water supply pipeline and the raw liquid delivery pipeline, and the check valves are provided downstream of the ball valves.
6. The antifriction system of the rectangular push bench according to any one of claims 1 to 4 further comprising bentonite pumping means for pumping bentonite between the push bench segments and the soil layer, the bentonite pumping means being provided in the middle shield of the push bench and in the upper half of the middle shield.
7. The antifriction system of the rectangular pipe pushing jack of claim 6, wherein the bentonite pumping device comprises a plurality of radial injection holes circumferentially arranged along the upper half of the middle shield, a diversion channel arranged at the radial injection holes, and a plurality of diversion bars circumferentially arranged along the upper half of the middle shield and arranged in the diversion channel, wherein the diversion channel is arranged along the direction from the middle shield to the tail shield, and the diversion bars are parallel to the tunneling direction of the rectangular pipe pushing jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432881.8A CN107091100B (en) | 2017-06-09 | 2017-06-09 | Antifriction system of rectangle push bench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432881.8A CN107091100B (en) | 2017-06-09 | 2017-06-09 | Antifriction system of rectangle push bench |
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| Publication Number | Publication Date |
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| CN107091100A CN107091100A (en) | 2017-08-25 |
| CN107091100B true CN107091100B (en) | 2023-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710432881.8A Active CN107091100B (en) | 2017-06-09 | 2017-06-09 | Antifriction system of rectangle push bench |
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| CN (1) | CN107091100B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110721506A (en) * | 2019-10-19 | 2020-01-24 | 长兴国晨工程机械科技有限公司 | Water supply device for muddy water balance push bench |
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| JPH06299779A (en) * | 1993-04-15 | 1994-10-25 | Mitsubishi Heavy Ind Ltd | Underwater tunnel excavator |
| CN101463724A (en) * | 2008-12-30 | 2009-06-24 | 上海隧道工程股份有限公司 | Construction method for connection passage by double-row hole horizontal freezing method |
| CN101575976A (en) * | 2009-06-04 | 2009-11-11 | 上海建工（集团）总公司 | Space enclosing structure convenient for opening door opening, construction method and use method thereof |
| CN102278120A (en) * | 2010-06-08 | 2011-12-14 | 上海力行工程技术发展有限公司 | Shield center cutting device for rotating by separately driving |
| CN202140088U (en) * | 2011-07-22 | 2012-02-08 | 中铁十一局集团城市轨道工程有限公司 | Shield machine foam agent injecting pipeline system capable of injecting bentonite symultaneously |
| CN102606164A (en) * | 2012-04-13 | 2012-07-25 | 大连华氏流体设备有限公司 | Foam injection system for shield machine and operating method of foam injection system |
| CN207161086U (en) * | 2017-06-09 | 2018-03-30 | 中国铁建重工集团有限公司 | A kind of abrasion reducing system of rectangular pipe jacking machine |
-
2017
- 2017-06-09 CN CN201710432881.8A patent/CN107091100B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06299779A (en) * | 1993-04-15 | 1994-10-25 | Mitsubishi Heavy Ind Ltd | Underwater tunnel excavator |
| CN101463724A (en) * | 2008-12-30 | 2009-06-24 | 上海隧道工程股份有限公司 | Construction method for connection passage by double-row hole horizontal freezing method |
| CN101575976A (en) * | 2009-06-04 | 2009-11-11 | 上海建工（集团）总公司 | Space enclosing structure convenient for opening door opening, construction method and use method thereof |
| CN102278120A (en) * | 2010-06-08 | 2011-12-14 | 上海力行工程技术发展有限公司 | Shield center cutting device for rotating by separately driving |
| CN202140088U (en) * | 2011-07-22 | 2012-02-08 | 中铁十一局集团城市轨道工程有限公司 | Shield machine foam agent injecting pipeline system capable of injecting bentonite symultaneously |
| CN102606164A (en) * | 2012-04-13 | 2012-07-25 | 大连华氏流体设备有限公司 | Foam injection system for shield machine and operating method of foam injection system |
| CN207161086U (en) * | 2017-06-09 | 2018-03-30 | 中国铁建重工集团有限公司 | A kind of abrasion reducing system of rectangular pipe jacking machine |
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| Publication number | Publication date |
|---|---|
| CN107091100A (en) | 2017-08-25 |
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