CN107664034A - A kind of shield foam air multistage adjusting means - Google Patents
A kind of shield foam air multistage adjusting means Download PDFInfo
- Publication number
- CN107664034A CN107664034A CN201610613145.8A CN201610613145A CN107664034A CN 107664034 A CN107664034 A CN 107664034A CN 201610613145 A CN201610613145 A CN 201610613145A CN 107664034 A CN107664034 A CN 107664034A
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- CN
- China
- Prior art keywords
- foam
- air
- solution
- pipeline
- adjusting means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The present invention relates to a kind of shield foam air multistage adjusting means, it is arranged on shield machine, the air mass flow accurate adjustment unit, foam solution flow coarse adjustment unit, foam generating unit and the soil body sensing unit that connect are communicated including control unit and respectively with control unit, air mass flow accurate adjustment unit and foam solution flow coarse adjustment unit are connected by pipeline with foam generating unit respectively.Compared with prior art, the present invention can improve foam effect, evade the caused improper risk factors of soil improvement of improper foam proportioning, shield machine is expanded in complicated geological adaptability, greatly improve safety in production performance of the shield machine in tunneling construction, construction and the management cost of driving are effectively reduced, produces significant economic benefit and good social benefit.
Description
Technical field
The invention belongs to shield machine technical field, and in particular to a kind of shield foam air multistage adjusting means.
Background technology
Earth pressure balanced shield, EPBS is the conventional engineering equipment of soft clay area constructing metro tunnel.But shield pass through stream plasticity compared with
Difference, water content are high, infiltration coefficient larger soil layer when, the soil body be present and liquefaction, slow, the easy molding of cutterhead of fltting speed etc. occurred by disturbance
Some technical barriers.Case history proves, not only contributes to keep excavation face earth pressure balance, and mechanical load using foam
And cutter head torque is obviously reduced, because the soil after foam is adjusted has good mobility and plasticity and prevents water penetration
Property, so the use of foam expands the soil scope that balancing earth-pressure shielding machine suitably excavates, while greatly reduce cutterhead torsion
Square, reduce the abrasion of cutter.At present, balancing earth-pressure shielding machine is provided with greatly foaming system, and foam also turns into sediment improvement
Essential additive.
Shield machine is as a kind of technology-intensive Important Project equipment for being exclusively used in underground engineering, as shield machine manufactures skill
The development of art, turn into trend using new material, new technology to lift shield machine manufacturing technology level, and during foam regulation,
Need to consider to produce many factors for mixing regulation between the foam dope of foam, water and air, so foaming system have it is multiple
Governing loop, influence each other, processing is bad to cause foam proportioning improper, and then influence the quality of shield driving engineering, safety,
Progress and engineering cost.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind can improve foam effect
Fruit, evade the caused improper risk factors of soil improvement of improper foam proportioning, expand shield machine in complicated geological adaptability,
Safety in production performance of the shield machine in tunneling construction is greatly improved, effectively reduces construction and the management cost of driving, is produced aobvious
The shield of the economic benefit of work and good social benefit foam air multistage adjusting means.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of shield foam air multistage adjusting means, is arranged on shield machine, including control unit and respectively with control
Air mass flow accurate adjustment unit, foam solution flow coarse adjustment unit, foam generating unit and the soil body sensing of unit communications connection processed
Unit, described air mass flow accurate adjustment unit and foam solution flow coarse adjustment unit are connected by pipeline and foam generating unit respectively
Connect.
Described air mass flow accurate adjustment unit includes gas supply assembly, and described gas supply assembly passes through pipe with foam generating unit
Road connects, be sequentially provided with the pipeline between gas supply assembly and foam generating unit mass air flow sensor, air pressure probe and
AIR Proportional regulating valve.
Described air mass flow accurate adjustment unit also includes being arranged on the air two-chip type ball valve of gas supply assembly gas vent, set
The air pneumatic ball valve and being arranged between air pneumatic ball valve and foam generating unit put in foam generating unit air inlet is managed
Air back valve on road.
Air two-chip type ball valve and air pneumatic ball valve can easily cut off the supply of air.
Described foam solution flow coarse adjustment unit includes water supply component and is respectively equipped with the foam dope of liquid level sensor
Case and foam solution case, described water supply component and foam dope case are connected by pipeline with foam solution case respectively, described
Foam solution case is connected with foam generating unit by pipeline, on the pipeline between foam solution case and foam generating unit successively
Provided with solution variable frequency adjustment pump, liquid inventory meter and solution pressure table.
Stoste measuring pump plus stock solution flow are sequentially provided with pipeline between described foam dope case and foam solution case
Count with stoste pneumatic ball valve, be sequentially provided with the pipeline between described water supply component and foam solution case and add water ga(u)ge and add
Water pneumatic ball valve, solution stirrer is additionally provided with described foam solution case.
Described foam solution flow coarse adjustment unit also includes the solution two-chip type ball for being arranged on the outlet of foam solution case
Valve, the solution check-valves for being arranged on foam maker liquid-inlet and it is arranged on solution two-chip type ball valve and solution variable frequency adjustment valve
Between y-type filter on pipeline.
Solution two-chip type ball valve can easily cut off the supply of foam solution.
Described foam generating unit is foam maker, and the foam maker includes the container with chamber and is filled in
The particle that particle diameter in the container cavity is 3~5mm, the outlet of foam maker is provided with delivery gauge.
The outlet of described foam maker is additionally provided with the low pressure ball valve for maintenance.
Described soil body sensing unit includes cutter head torque sensor, soil pressure value sensor and the pick being arranged on shield machine
Enter rate sensor.
When shield machine works, cutter head torque sensor sensing to cutterhead torsion becomes big, soil pressure value sensor sensing to soil pressure
Value increase, Advance rate sensor sensing are slack-off to driving speed, and signal is fed back into controller, under the control of the controller,
Increase air mass flow and foam liquid flow, so that foam matches with soil body feature, according to progress such as soil body changes certainly
Dynamic regulation, suppresses extraneous interference, the precision of true system fading margin, meets the ratio of air mass flow and foam dope to reach to institute
The optimal improvement of the tunneling construction soil body.
As supplementary means, the system can also be detected by the soil body that operating personnel discharge to shield machine, and root
According to the physicochemical properties of the soil body, by controller, manually air mass flow and foam solution flow are adjusted so that shield
Machine driving is smooth.
Solution variable frequency adjustment pump realizes the quantity delivered of pump by frequency converter come regulation motor revolution, though what is carried out is coarse adjustment,
But regulation is rapid, whether it is needed for system and air that liquid inventory meter is used for monitoring solution variable frequency adjustment pump delivery in real time
The flow of flows match.
The performance of air adjustment determines whether the foam that shield machine is formed meets under different geological conditions in system, special
Be not the tunneling construction requirement under the geological conditions that need to be improved, directly decide the quality of shield driving engineering, safety, progress and
Engineering cost.Thus the Flow-rate adjustment of air needs accurate control, and both air flow modulation of the invention is adjusted by AIR Proportional
Valve carries out the regulation of air mass flow, and Flow-rate adjustment is linear, and control is accurate, and foam solution flow coarse adjustment unit matching, and leads to
Cross each sensor and the signal measured is passed into controller, form closed-loop system, tunneling construction must be adapted to so as to match somebody with somebody in real time
The foam proportioning that the improvement of the live soil body requires.
Compared with prior art, the invention has the advantages that：
(1) present invention is completely newly researched and developed using new material, new technology to foam air regulating system in foaming system, entirely
New construction and by system optimizing control, the compressed air hybrid technique of a linear regulation is provided for foaming system, with being
The relevant parameter of the coarse adjustment link of system forms a closed-loop system, easily reaches the improvement for matching out the adaptation tunneling construction scene soil body
It is required that foam proportioning.
(2) can be according to soil improvement scheme, there is provided the foam proportioning agreed with, improve the efficiency of soil improvement, effectively
Soil improvement construction cost is reduced, safety and production hidden danger or accident, improve shield caused by effectively avoiding improper soil improvement
The level of security of structure machine tunneling construction, effectively save engineering time and relevant cost.
(3) foam solution flow coarse adjustment unit can be matched accurately to water and foam dope.
(4) by control assembly, optimize algorithm design processed and program composition, control air and foam that can be better be molten
Flow quantity so that shield machine driving is more steady efficient.
(5) by 3~5mm of foam maker pipe interior diameter or so particulate interspaces, 30 μm~400 μm fine emulsus are generated
Foam, digging face and soil cabin are injected into, the soil improvement on stratum is excavated in realization, and foam effect is good.
After foam is added, its plastotype, mobility, barrier properties and elasticity are improved soil as Supporting Media,
The soil body is improved, prevents clay from forming mud cake, while plays reduction frictional force, shield machine driving driving power may be reduced by, and also have
The abrasion of cutter can also be reduced by playing a part of lubrication.Crossed for foaming system multiple factors, interactional work
State, the control thinking being combined using coarse adjustment with accurate adjustment, coarse adjustment set foam dope and water i.e. with the soil body situation on stratum
Precise proportions, and coarse adjustment forms the foam solution flow for meeting live soil improvement, accurate adjustment is mixed by adjusting with foam solution
Compressed air combined amount, reaching foam can realize for section soil improvement of constructing instantly to greatest extent.
Brief description of the drawings
Fig. 1 is the shield foam air multistage adjusting means connection diagram of the embodiment of the present invention 1.
In figure, 1 is delivery gauge, and 2 be foam maker, and 3 be air back valve, and 4 be air pneumatic ball valve, and 5 be sky
Gas ratio adjusting valve, 6 be air pressure probe, and 7 be mass air flow sensor, and 9 be air two-chip type ball valve, and 10 be to add water-carrying capacity
Meter, 11 is add stock solution flow meter, and 12 be low pressure ball valve, and 13 be solution check-valves, and 15 is add water to start ball valve, and 16 be that stoste is pneumatic
Ball valve, 17 be solution stirrer, and 18 be foam solution liquid level sensor, and 19 be stoste liquid level sensor, and 20 be solution pressure table,
21 be liquid inventory meter, and 22 be solution variable frequency adjustment valve, and 23 be y-type filter, and 24 be solution two-chip type ball valve, and 25 be that foam is molten
Liquid case, 26 be stoste measuring pump, and 27 be foam dope case.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of shield foam air multistage adjusting means, as shown in figure 1, be arranged on shield machine, including control unit
And air mass flow accurate adjustment unit, foam solution flow coarse adjustment unit, the foam generating unit connected respectively with control unit communication
With soil body sensing unit, described air mass flow accurate adjustment unit and foam solution flow coarse adjustment unit pass through pipeline and foam respectively
Generating unit connects.
Wherein, air mass flow accurate adjustment unit includes gas supply assembly, and described gas supply assembly passes through pipe with foam generating unit
Road is connected, and mass air flow sensor 7, air pressure probe 6 are sequentially provided with the pipeline between gas supply assembly and foam generating unit
With AIR Proportional regulating valve 5, air mass flow accurate adjustment unit also includes the air two-chip type ball for being arranged on gas supply assembly gas vent
Valve 9, the air pneumatic ball valve 4 for being arranged on foam generating unit air inlet and be arranged on air pneumatic ball valve 4 and foam occur it is single
Air back valve 3 between member on pipeline.
Foam solution flow coarse adjustment unit includes water supply component and is respectively equipped with foam dope liquid level sensor 19 and foam
The foam dope case 27 and foam solution case 25 of solution level sensor 18, described water supply component and foam dope case 27 are distinguished
It is connected by pipeline with foam solution case 25, described foam solution case 25 is connected with foam generating unit by pipeline, foam
Solution variable frequency adjustment valve 22, liquid inventory meter 21 and solution are sequentially provided with pipeline between liquor box 25 and foam generating unit
Pressure gauge 20, stoste measuring pump 26 plus stoste stream are sequentially provided with the pipeline between foam dope case 27 and foam solution case 25
Gauge 11 and stoste pneumatic ball valve 16, are sequentially provided with the pipeline between described water supply component and foam solution case 25 plus current
Gauge 10 and plus water pneumatic ball valve 15, be additionally provided with solution stirrer 17 in described foam solution case 25, foam solution flow is thick
Unit is adjusted also to include being arranged on the solution two-chip type ball valve 24 of the outlet of foam solution case 25, be arranged on the liquid of foam maker 2
The solution check-valves 13 of import and the Y type mistakes being arranged between solution two-chip type ball valve 24 and solution variable frequency adjustment valve 22 on pipeline
Filter 23.
Foam generating unit is foam maker 2, and the foam maker 2 includes the container with chamber and is filled in the appearance
The particle that particle diameter in device cavity is 3~5mm, the outlet of foam maker 2 is provided with delivery gauge 1.Described foam occurs
The outlet of device 2 is additionally provided with the low pressure ball valve 12 for maintenance.
The air pressure probe 6, solution pressure table 20 and delivery gauge 1 of the present embodiment are passed using diaphragm type pressure
Sensor.
Soil body sensing unit includes cutter head torque sensor, soil pressure value sensor and the Advance rate being arranged on shield machine
Sensor.As supplementary means, the system can also be detected by the soil body that operating personnel discharge to shield machine, and according to
The physicochemical properties of the soil body, by controller, manually air mass flow and foam solution flow are adjusted so that shield machine
Driving smoothly (such as detects, when water content is big, hardness is big to the water content and hardness of the soil body derived from shield machine
Wait, the flow of air and foam solution is increased by controller).
In the use of the present invention,
(1) solution ratio：It is preferably injected the water and the total measurement (volume) 5% of foam solution case 25 of the total measurement (volume) 95% of foam solution case 25
Foam dope carry out uniform stirring form a kind of foam solution.Inject during water and stoste can by respective flowmeter come
Monitoring, accurately injects proportional quantity.Air-powered electromagnetic can be fed back to when injection rate reaches foam solution liquid level sensor 18 when setting is put
One voltage signal of valve, close add water pneumatic ball valve 15 and stoste pneumatic ball valve 16 to complete proportioning injection in time.
(2) blowing air and solution：
The solution variable frequency adjustment of the present embodiment is to realize the quantity delivered of pump by frequency converter come regulation motor revolution.Solution
Whether it is solution needed for system with air proportional quantity that flowmeter can monitor solution pump delivery in real time.Adjusted according to monitoring value
Motor rotations are saved, reach proportional quantity needed for system.
The air compressor normal supply pressure 0.7MPa value critical fields of the preferred gas supply assembly of the present embodiment, AIR Proportional
Regulating valve 5 is opened, and it, which controls air mass flow size, is set up by 4~20mA of a controller output analog signalses,
Whether mass air flow sensor 7 also meets ratio requirement in the air mass flow that monitored pipeline passed through simultaneously.Air pressure probe 6
Simultaneously in feedback pipe air pressure value.
(3) foam occurs：
The mixing of air and foam solution is added simultaneously by the air intlet and liquid-inlet of foam maker (foam gun)
Enter foam agent solution and air, the foam maker port of export sets outlet pressure sensor, understands foam maker pipeline in real time
And the pressure size of cutterhead outlet.By the gap between 3~5mm of foam maker pipe interior diameter or so stone, 30 μm of generation~
400 μm of fine creamy heads, are injected into digging face and soil cabin.Realize the soil improvement for excavating stratum.
After foam is added, its plastotype, mobility, barrier properties and elasticity are improved soil as Supporting Media,
The soil body is improved, prevents clay from forming mud cake, while plays reduction frictional force, shield machine driving driving power may be reduced by, and also have
The abrasion of cutter can also be reduced by playing a part of lubrication.Crossed for foaming system multiple factors, interactional work
State, the control thinking being combined using coarse adjustment with accurate adjustment, coarse adjustment set foam dope and water i.e. with the soil body situation on stratum
Precise proportions, and coarse adjustment forms the foam solution flow for meeting live soil improvement, accurate adjustment is mixed by adjusting with foam solution
Compressed air combined amount, reaching foam can realize for section soil improvement of constructing instantly to greatest extent.
Claims (9)
1. a kind of shield foam air multistage adjusting means, is arranged on shield machine, it is characterised in that including control unit and
Respectively with control unit communication connection air mass flow accurate adjustment unit, foam solution flow coarse adjustment unit, foam generating unit and
Soil body sensing unit, described air mass flow accurate adjustment unit and foam solution flow coarse adjustment unit are sent out by pipeline and foam respectively
Raw unit connection.
A kind of 2. shield according to claim 1 foam air multistage adjusting means, it is characterised in that described air
Flow accurate adjustment unit includes gas supply assembly, and described gas supply assembly is connected with foam generating unit by pipeline, gas supply assembly with
Mass air flow sensor (7), air pressure probe (6) and AIR Proportional regulation are sequentially provided with pipeline between foam generating unit
Valve (5).
A kind of 3. shield according to claim 2 foam air multistage adjusting means, it is characterised in that described air
Flow accurate adjustment unit also includes being arranged on the air two-chip type ball valve (9) of gas supply assembly gas vent, is arranged on foam generation list
The air pneumatic ball valve (4) of first air inlet and it is arranged on sky between air pneumatic ball valve (4) and foam generating unit on pipeline
Gas check-valves (3).
A kind of 4. shield according to claim 1 foam air multistage adjusting means, it is characterised in that described foam
Liquid inventory coarse adjustment unit includes water supply component and is respectively equipped with the foam dope case (27) and foam solution case of liquid level sensor
(25), described water supply component and foam dope case (27) are connected by pipeline with foam solution case (25) respectively, described bubble
Foam liquor box (25) is connected with foam generating unit by pipeline, the pipeline between foam solution case (25) and foam generating unit
On be sequentially provided with solution variable frequency adjustment valve (22), liquid inventory meter (21) and solution pressure table (20).
A kind of 5. shield according to claim 4 foam air multistage adjusting means, it is characterised in that described foam
Stoste measuring pump (26) plus stock solution flow meter (11) are sequentially provided with pipeline between stoste case (27) and foam solution case (25)
With stoste pneumatic ball valve (16), it is sequentially provided with the pipeline between described water supply component and foam solution case (25) and adds water-carrying capacity
Count (10) and add water pneumatic ball valve (15), solution stirrer (17) is additionally provided with described foam solution case (25).
A kind of 6. shield according to claim 5 foam air multistage adjusting means, it is characterised in that described foam
Liquid inventory coarse adjustment unit also includes being arranged on the solution two-chip type ball valve (24) of the outlet of foam solution case (25), is arranged on bubble
The solution check-valves (13) of foam generator (2) liquid-inlet and it is arranged on solution two-chip type ball valve (24) and solution variable frequency adjustment valve
(22) y-type filter (23) between on pipeline.
A kind of 7. shield according to claim 1 foam air multistage adjusting means, it is characterised in that described foam
Generating unit is foam maker (2), and the foam maker (2) includes the container with chamber and is filled in the container cavity
Particle diameter be 3~5mm particle, the outlet of foam maker (2) is provided with delivery gauge (1).
A kind of 8. shield according to claim 7 foam air multistage adjusting means, it is characterised in that described foam
The outlet of generator (2) is additionally provided with the low pressure ball valve (12) for maintenance.
A kind of 9. shield according to claim 1 foam air multistage adjusting means, it is characterised in that the described soil body
Sensing unit includes cutter head torque sensor, soil pressure value sensor and the Advance rate sensor being arranged on shield machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610613145.8A CN107664034B (en) | 2016-07-29 | 2016-07-29 | Shield constructs with foam air multistage adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610613145.8A CN107664034B (en) | 2016-07-29 | 2016-07-29 | Shield constructs with foam air multistage adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107664034A true CN107664034A (en) | 2018-02-06 |
| CN107664034B CN107664034B (en) | 2020-09-15 |
Family
ID=61115756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610613145.8A Active CN107664034B (en) | 2016-07-29 | 2016-07-29 | Shield constructs with foam air multistage adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107664034B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018214262A1 (en) * | 2018-08-23 | 2020-02-27 | Holger Gawryck | Device for producing foamed building materials |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000104943A (en) * | 1998-09-30 | 2000-04-11 | Daikin Ind Ltd | Air-conditioning unit |
| CN201339473Y (en) * | 2008-12-24 | 2009-11-04 | 中铁隧道集团有限公司 | Foam injection device for composite shield ground conditioning system |
| 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 |
| CN103566784A (en) * | 2012-07-27 | 2014-02-12 | 保罗·M·法尔可 | Foam production system and method |
| CN104234719A (en) * | 2014-09-20 | 2014-12-24 | 辽宁三三工业有限公司 | Foaming system of shield tunneling machine |
| CN205895246U (en) * | 2016-07-29 | 2017-01-18 | 上海力行工程技术发展有限公司 | Shield constructs with foam air multistage adjusting device |
-
2016
- 2016-07-29 CN CN201610613145.8A patent/CN107664034B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000104943A (en) * | 1998-09-30 | 2000-04-11 | Daikin Ind Ltd | Air-conditioning unit |
| CN201339473Y (en) * | 2008-12-24 | 2009-11-04 | 中铁隧道集团有限公司 | Foam injection device for composite shield ground conditioning system |
| 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 |
| CN103566784A (en) * | 2012-07-27 | 2014-02-12 | 保罗·M·法尔可 | Foam production system and method |
| CN104234719A (en) * | 2014-09-20 | 2014-12-24 | 辽宁三三工业有限公司 | Foaming system of shield tunneling machine |
| CN205895246U (en) * | 2016-07-29 | 2017-01-18 | 上海力行工程技术发展有限公司 | Shield constructs with foam air multistage adjusting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018214262A1 (en) * | 2018-08-23 | 2020-02-27 | Holger Gawryck | Device for producing foamed building materials |
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| Publication number | Publication date |
|---|---|
| CN107664034B (en) | 2020-09-15 |
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