CN107664034B - Shield constructs with foam air multistage adjusting device - Google Patents
Shield constructs with foam air multistage adjusting device Download PDFInfo
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- CN107664034B CN107664034B CN201610613145.8A CN201610613145A CN107664034B CN 107664034 B CN107664034 B CN 107664034B CN 201610613145 A CN201610613145 A CN 201610613145A CN 107664034 B CN107664034 B CN 107664034B
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- 239000006260 foam Substances 0.000 title claims abstract description 179
- 239000002689 soil Substances 0.000 claims abstract description 54
- 230000005641 tunneling Effects 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000011550 stock solution Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 238000004378 air conditioning Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 14
- 230000006872 improvement Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005187 foaming Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a foam air multi-section adjusting device for a shield machine, which is arranged on the shield machine and comprises a control unit, an air flow fine adjusting unit, a foam solution flow coarse adjusting unit, a foam generating unit and a soil body sensing unit, wherein the air flow fine adjusting unit, the foam solution flow coarse adjusting unit, the foam generating unit and the soil body sensing unit are respectively in communication connection with the control unit, and the air flow fine adjusting unit and the foam solution flow coarse adjusting unit are respectively connected with the foam generating unit through pipelines. Compared with the prior art, the invention can improve the foam effect, avoid the risk factor of improper soil improvement caused by improper foam proportion, expand the adaptability of the shield machine in complex geology, greatly improve the safe production performance of the shield machine in tunneling construction, effectively reduce the tunneling construction and management cost, and generate obvious economic benefit and good social benefit.
Description
Technical Field
The invention belongs to the technical field of shield tunneling machines, and particularly relates to a foam air multi-section adjusting device for a shield.
Background
The earth pressure balance shield is a common engineering device for subway tunnel construction in soft soil areas. However, when the shield is used in a soil layer with poor cross flow plasticity, high water content and large permeability coefficient, the technical problems of liquefaction of disturbed soil, low propelling speed, easy caking of a cutter head and the like exist. Engineering examples prove that the foam is favorable for keeping the pressure balance of the soil on the excavation surface, the mechanical load and the cutter head torque are obviously reduced, and the soil after being adjusted by the foam has good fluidity, plasticity and water-proof permeability, so that the application of the foam enlarges the soil range suitable for excavation of the soil pressure balance shield machine, greatly reduces the cutter head torque and reduces the abrasion of cutters. At present, most of earth pressure balance shield machines are equipped with foam systems, and foams also become necessary additives for improving muck.
As a shield machine is specially used for technical intensive heavy engineering equipment of underground engineering, along with the development of shield machine manufacturing technology, a new material and a new process are applied to promote the shield machine manufacturing technical level to become a trend, and in the foam adjusting process, various factors of mixing and adjusting foam stock solution, water and air which generate foam need to be considered, so that a foam system has multiple adjusting links, the foam system is mutually influenced, the foam cannot be well treated, the foam cannot be properly proportioned, and the quality, safety, progress and engineering cost of shield tunneling engineering are further influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the foam air multi-section adjusting device for the shield, which can improve the foam effect, avoid the risk factor of improper soil body improvement caused by improper foam proportion, expand the adaptability of the shield machine in complex geology, greatly improve the safety production performance of the shield machine in tunneling construction, effectively reduce the tunneling construction and management cost and generate obvious economic benefit and good social benefit.
The purpose of the invention can be realized by the following technical scheme:
a foam air multi-section adjusting device for a shield machine is arranged on the shield machine and comprises a control unit, an air flow fine adjusting unit, a foam solution flow coarse adjusting unit, a foam generating unit and a soil body sensing unit, wherein the air flow fine adjusting unit, the foam solution flow coarse adjusting unit, the foam generating unit and the soil body sensing unit are respectively in communication connection with the control unit, and the air flow fine adjusting unit and the foam solution flow coarse adjusting unit are respectively connected with the foam generating unit through pipelines.
The air flow rate fine adjustment unit comprises an air supply assembly, the air supply assembly is connected with the foam generation unit through a pipeline, and an air flow meter, an air pressure sensor and an air proportion adjusting valve are sequentially arranged on the pipeline between the air supply assembly and the foam generation unit.
The air flow fine adjustment unit further comprises an air two-piece type ball valve arranged at an air outlet of the air supply assembly, an air pneumatic ball valve arranged at an air inlet of the foam generation unit and an air check valve arranged on a pipeline between the air pneumatic ball valve and the foam generation unit.
The air two-piece ball valve and the air pneumatic ball valve can conveniently cut off the supply of air.
The foam solution flow coarse adjustment unit comprises a water supply assembly, a foam stock solution tank and a foam solution tank, wherein the foam stock solution tank and the foam solution tank are respectively provided with a liquid level sensor, the water supply assembly and the foam stock solution tank are respectively connected with the foam solution tank through pipelines, the foam solution tank is connected with the foam generation unit through a pipeline, and a solution variable frequency regulating pump, a solution flowmeter and a solution pressure gauge are sequentially arranged on the pipeline between the foam solution tank and the foam generation unit.
The foam solution tank is characterized in that a solution metering pump, a solution adding flowmeter and a solution pneumatic ball valve are sequentially arranged on a pipeline between the foam solution tank and the foam solution tank, a water adding flowmeter and a water adding pneumatic ball valve are sequentially arranged on a pipeline between the water supply assembly and the foam solution tank, and a solution stirrer is further arranged in the foam solution tank.
The foam solution flow coarse adjustment unit further comprises a solution two-piece type ball valve arranged at an outlet of the foam solution tank, a solution check valve arranged at a liquid inlet of the foam generator and a Y-shaped filter arranged on a pipeline between the solution two-piece type ball valve and the solution variable-frequency adjusting valve.
The solution two-piece ball valve can conveniently cut off the supply of the foam solution.
The foam generator is characterized in that the foam generating unit is a foam generator, the foam generator comprises a container with a cavity and particles with the particle size of 3-5 mm filled in the cavity of the container, and an outlet pressure gauge is arranged at an outlet of the foam generator.
And the outlet of the foam generator is also provided with a low-pressure ball valve for maintenance.
The soil sensing unit comprises a cutter head torque sensor, a soil pressure value sensor and a tunneling rate sensor which are arranged on the shield tunneling machine.
When the shield machine works, the cutter head torque sensor senses that the cutter head torque force is increased, the soil pressure value sensor senses that the soil pressure value is increased, the tunneling speed sensor senses that the tunneling speed is reduced, signals are fed back to the controller, and the air flow and the foam liquid flow are increased under the control of the controller, so that the foam is matched with the soil body characteristics, automatic adjustment is performed according to the soil body change and the like, external interference is inhibited, the adjustment precision of the system is ensured, and the proportion of the air flow and the foam stock solution is met so as to achieve the best improvement of the tunneling construction soil body.
As an auxiliary means, the system can also detect the soil body discharged by the shield machine through an operator, and manually adjust the air flow and the foam solution flow through the controller according to the physical and chemical properties of the soil body, so that the shield machine can smoothly tunnel.
The solution variable-frequency regulating pump regulates the revolution number of a motor through a frequency converter to realize the supply quantity of the pump, although coarse regulation is carried out, the regulation is rapid, and a solution flowmeter is used for monitoring whether the output quantity of the solution variable-frequency regulating pump is the flow quantity matched with the air flow required by a system in real time.
The performance of air conditioning in the system determines whether the foam formed by the shield tunneling machine meets the tunneling construction requirements under different geological conditions, particularly the geological conditions needing to be improved, and directly determines the quality, safety, progress and engineering cost of the shield tunneling engineering. Therefore, the air flow regulation needs to be accurately controlled, the air flow regulation of the invention adjusts the air flow through the air proportion regulating valve, the flow regulation is linear and accurate, the invention is matched with the foam solution flow coarse regulation unit, and the measured signals are transmitted to the controller through various sensors to form a closed loop system, thereby being capable of matching the foam proportion which is suitable for the improvement requirement of the soil body of the tunneling construction site in real time.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention applies new materials and new processes to carry out brand new research and development on a foam air conditioning system in a foam system, provides a linearly-adjusted compressed air mixing process for the foam system through a brand new structure and an optimized control algorithm, forms a closed loop system with relevant parameters of a coarse adjustment link of the system, and easily achieves the foam proportioning which is suitable for the improvement requirement of a soil body on a tunneling construction site.
(2) According to the soil body improvement scheme, a fit foam ratio is provided, the soil body improvement efficiency is improved, the soil body improvement construction cost is effectively reduced, the potential safety hazard or the production accident caused by improper soil body improvement is effectively avoided, the safety level of the shield tunneling construction is improved, and the construction time and the related cost are effectively saved.
(3) The foam solution flow coarse adjustment unit can accurately match water with foam stock solution.
(4) By means of the control assembly, optimization algorithm design and programming are achieved, air and foam solution flow can be better controlled, and the shield tunneling machine is more stable and efficient in tunneling.
(5) Micro milky foam with the diameter of 30-400 mu m is generated through the particle gaps with the diameter of about 3-5 mm in the foam generator pipe and is injected into the digging face and the soil cabin, so that the soil body improvement of the excavated stratum is realized, and the foam effect is good.
After the foam is added into the soil serving as a supporting medium, the molding, the flowability, the seepage resistance and the elasticity of the soil are improved, the soil body is improved, the clay is prevented from being caked into mud cakes, the friction force is reduced, the driving power of the shield tunneling machine during tunneling can be reduced, and the lubricating and cooling effects can also be realized to reduce the abrasion of cutters. Aiming at the working states of the foam system in which multiple factors are intersected and mutually influenced, a control thought combining rough adjustment and fine adjustment is applied, the rough adjustment is that the precise proportion of foam stock solution and water is set according to the soil condition of a stratum, the foam solution flow meeting the field soil improvement is formed through the rough adjustment, and the fine adjustment achieves that the foam can improve the soil in the current construction interval to the maximum extent through adjusting the mixing amount of compressed air mixed with the foam solution.
Drawings
Fig. 1 is a schematic connection diagram of a multi-stage foam air conditioning device for a shield according to embodiment 1 of the present invention.
In the figure, 1 is an outlet pressure gauge, 2 is a foam generator, 3 is an air check valve, 4 is an air pneumatic ball valve, 5 is an air proportional control valve, 6 is an air pressure sensor, 7 is an air flow meter, 9 is an air two-piece ball valve, 10 is a water adding flow meter, 11 is a stock solution adding flow meter, 12 is a low-pressure ball valve, 13 is a solution check valve, 15 is a water adding starting ball valve, 16 is a stock solution pneumatic ball valve, 17 is a solution stirrer, 18 is a foam solution level sensor, 19 is a stock solution level sensor, 20 is a solution pressure meter, 21 is a solution flow meter, 22 is a solution variable frequency control valve, 23 is a Y-shaped filter, 24 is a solution two-piece ball valve, 25 is a foam solution tank, 26 is a stock solution metering pump, and 27 is a foam stock solution tank.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A multi-section foam air adjusting device for a shield machine is arranged on the shield machine and comprises a control unit, an air flow fine adjusting unit, a foam solution flow coarse adjusting unit, a foam generating unit and a soil body sensing unit, wherein the air flow fine adjusting unit, the foam solution flow coarse adjusting unit, the foam generating unit and the soil body sensing unit are respectively in communication connection with the control unit, and the air flow fine adjusting unit and the foam solution flow coarse adjusting unit are respectively connected with the foam generating unit through pipelines.
Wherein, air flow rate accurate adjustment unit includes the air feed subassembly, air feed subassembly and foam generation unit pass through the pipe connection, be equipped with air flowmeter 7, air pressure sensor 6 and air ratio control valve 5 on the pipeline between air feed subassembly and the foam generation unit in proper order, air flow rate accurate adjustment unit is still including setting up at the air two formula ball valves 9 of the gas outlet of air feed subassembly, setting up at the air pneumatic ball valve 4 of foam generation unit air inlet and setting up the air check valve 3 on the pipeline between air pneumatic ball valve 4 and foam generation unit.
The foam solution flow coarse adjustment unit comprises a water supply assembly, a foam solution tank 27 and a foam solution tank 25, wherein the foam solution tank 27 and the foam solution tank 25 are respectively provided with a foam solution liquid level sensor 19 and a foam solution liquid level sensor 18, the water supply assembly and the foam solution tank 27 are respectively connected with the foam solution tank 25 through pipelines, the foam solution tank 25 is connected with the foam generation unit through a pipeline, a solution variable frequency control valve 22, a solution flowmeter 21 and a solution pressure gauge 20 are sequentially arranged on the pipeline between the foam solution tank 25 and the foam generation unit, a solution metering pump 26, a raw solution adding flowmeter 11 and a raw solution pneumatic ball valve 16 are sequentially arranged on the pipeline between the foam solution tank 27 and the foam solution tank 25, a water adding flowmeter 10 and a water adding pneumatic ball valve 15 are sequentially arranged on the pipeline between the water supply assembly and the foam solution tank 25, and a solution stirrer 17 is further arranged in the foam solution tank 25, the foam solution flow coarse adjustment unit also comprises a solution two-piece ball valve 24 arranged at the outlet of the foam solution tank 25, a solution check valve 13 arranged at the liquid inlet of the foam generator 2 and a Y-shaped filter 23 arranged on a pipeline between the solution two-piece ball valve 24 and the solution variable-frequency adjusting valve 22.
The foam generating unit is a foam generator 2, the foam generator 2 comprises a container with a cavity and particles with the particle size of 3-5 mm filled in the cavity of the container, and an outlet pressure gauge 1 is arranged at an outlet of the foam generator 2. The outlet of the foam generator 2 is also provided with a low-pressure ball valve 12 for maintenance.
The air pressure sensor 6, the solution pressure gauge 20 and the outlet pressure gauge 1 of the present embodiment are all diaphragm type pressure sensors.
The soil sensing unit comprises a cutter head torque sensor, a soil pressure value sensor and a tunneling rate sensor which are arranged on the shield tunneling machine. As an auxiliary means, the system can also detect the soil body discharged by the shield machine through an operator, manually adjust the air flow and the foam solution flow through the controller according to the physical and chemical properties of the soil body, so that the shield machine can smoothly tunnel (for example, the water content and the hardness of the soil body led out by the shield machine are detected, and when the water content is large and the hardness is large, the flow of the air and the foam solution is increased through the controller).
When the invention is used, the water-saving agent is added,
(1) solution proportioning: preferably, 95% of the total volume of the foaming solution tank 25 is filled with water and 5% of the total volume of the foaming solution tank 25 is filled with the raw foaming solution, and the mixture is uniformly stirred to form a foaming solution. The process of injecting water and stock solution can be monitored by respective flow meters, and the proportioning amount can be accurately injected. When the injection amount reaches the set value, the foam solution level sensor 18 feeds back a voltage signal to the pneumatic electromagnetic valve, and the water-adding pneumatic ball valve 15 and the raw liquid pneumatic ball valve 16 are closed in time to complete the proportioning injection.
(2) Aeration and solution:
the solution frequency conversion adjustment of the embodiment is to adjust the rotation number of the motor through the frequency converter to realize the supply amount of the pump. The solution flowmeter can monitor whether the solution pump output is the ratio of the solution required by the system and the air in real time. And adjusting the revolution of the motor according to the monitored value to achieve the matching amount required by the system.
In the embodiment, the normal supply pressure of the air compressor of the air supply assembly is preferably within a standard range of 0.7MPa, the air proportion regulating valve 5 is opened, the air flow rate is controlled to be set by outputting an analog quantity signal of 4-20 mA through the controller, and meanwhile, the air flow meter 7 monitors whether the air flow rate passing through the pipeline meets the proportioning requirement or not. The air pressure sensor 6 also feeds back the pressure value of the air in the pipeline.
(3) Foam generation:
the air and the foam solution are mixed through an air inlet and a liquid inlet of a foam generator (a foam gun), the foaming agent solution and the air are added simultaneously, and an outlet pressure sensor is arranged at the outlet end of the foam generator, so that the pressure of a pipeline of the foam generator and the pressure of an outlet of a cutter head are known in real time. And generating 30-400 mu m micro milky foam through gaps among stones with the diameters of about 3-5 mm in the foam generator pipe, and injecting the micro milky foam into the digging face and the soil cabin. And the soil body improvement of the excavated stratum is realized.
After the foam is added into the soil serving as a supporting medium, the molding, the flowability, the seepage resistance and the elasticity of the soil are improved, the soil body is improved, the clay is prevented from being caked into mud cakes, the friction force is reduced, the driving power of the shield tunneling machine during tunneling can be reduced, and the lubricating and cooling effects can also be realized to reduce the abrasion of cutters. Aiming at the working states of the foam system in which multiple factors are intersected and mutually influenced, a control thought combining rough adjustment and fine adjustment is applied, the rough adjustment is that the precise proportion of foam stock solution and water is set according to the soil condition of a stratum, the foam solution flow meeting the field soil improvement is formed through the rough adjustment, and the fine adjustment achieves that the foam can improve the soil in the current construction interval to the maximum extent through adjusting the mixing amount of compressed air mixed with the foam solution.
Claims (3)
1. A multi-section foam air adjusting device for a shield machine is arranged on the shield machine and is characterized by comprising a control unit, and an air flow fine adjusting unit, a foam solution flow coarse adjusting unit, a foam generating unit and a soil body sensing unit which are respectively in communication connection with the control unit, wherein the air flow fine adjusting unit and the foam solution flow coarse adjusting unit are respectively connected with the foam generating unit through pipelines;
the air flow fine adjustment unit comprises an air supply assembly, the air supply assembly is connected with the foam generation unit through a pipeline, an air flow meter (7), an air pressure sensor (6) and an air proportion adjusting valve (5) are sequentially arranged on the pipeline between the air supply assembly and the foam generation unit, the air flow fine adjustment unit further comprises an air two-piece ball valve (9) arranged at an air outlet of the air supply assembly, an air pneumatic ball valve (4) arranged at an air inlet of the foam generation unit and an air check valve (3) arranged on the pipeline between the air pneumatic ball valve (4) and the foam generation unit;
the foam solution flow coarse adjustment unit comprises a water supply assembly, a foam stock solution tank (27) and a foam solution tank (25) which are respectively provided with a liquid level sensor, the water supply assembly and the foam stock solution tank (27) are respectively connected with the foam solution tank (25) through pipelines, the foam solution tank (25) is connected with the foam generation unit through a pipeline, a solution variable frequency control valve (22), a solution flowmeter (21) and a solution pressure gauge (20) are sequentially arranged on the pipeline between the foam solution tank (25) and the foam generation unit, a stock solution metering pump (26), a stock solution adding flowmeter (11) and a stock solution pneumatic ball valve (16) are sequentially arranged on the pipeline between the foam stock solution tank (27) and the foam solution tank (25), a water adding flowmeter (10) and a water adding pneumatic ball valve (15) are sequentially arranged on the pipeline between the water supply assembly and the foam solution tank (25), the foam solution tank (25) is also internally provided with a solution stirrer (17), and the foam solution flow coarse adjustment unit also comprises a solution two-piece type ball valve (24) arranged at the outlet of the foam solution tank (25), a solution check valve (13) arranged at the liquid inlet of the foam generator (2) and a Y-shaped filter (23) arranged on a pipeline between the solution two-piece type ball valve (24) and the solution variable-frequency adjusting valve (22);
the soil sensing unit comprises a cutter head torque sensor, a soil pressure value sensor and a tunneling rate sensor which are arranged on the shield tunneling machine.
2. The multi-stage foam air conditioning device for the shield according to claim 1, wherein the foam generating unit is a foam generator (2), the foam generator (2) comprises a container with a chamber and particles with the particle size of 3-5 mm filled in the chamber of the container, and an outlet pressure gauge (1) is arranged at an outlet of the foam generator (2).
3. The multi-stage foam air conditioning device for the shield according to claim 2, characterized in that the outlet of the foam generator (2) is further provided with a low pressure ball valve (12) for maintenance.
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 |
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| Publication Number | Publication Date |
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| CN107664034A CN107664034A (en) | 2018-02-06 |
| CN107664034B true CN107664034B (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610613145.8A Active CN107664034B (en) | 2016-07-29 | 2016-07-29 | Shield constructs with foam air multistage adjusting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102018214262A1 (en) * | 2018-08-23 | 2020-02-27 | Holger Gawryck | Device for producing foamed building materials |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3052942B2 (en) * | 1998-09-30 | 2000-06-19 | ダイキン工業株式会社 | 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 |
| CN102606164B (en) * | 2012-04-13 | 2014-02-19 | 大连华峰发展公司 | Foam injection system for shield machine and operating method of foam injection system |
| US20140029371A1 (en) * | 2012-07-27 | 2014-01-30 | Paul M. Falco | 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 |
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