CN103909579A - Automatic control operation device for mixing mud - Google Patents
Automatic control operation device for mixing mud Download PDFInfo
- Publication number
- CN103909579A CN103909579A CN201410164171.8A CN201410164171A CN103909579A CN 103909579 A CN103909579 A CN 103909579A CN 201410164171 A CN201410164171 A CN 201410164171A CN 103909579 A CN103909579 A CN 103909579A
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- CN
- China
- Prior art keywords
- mud
- operation device
- control operation
- automatic control
- hopper
- 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.)
- Granted
Links
- 238000010276 construction Methods 0.000 claims abstract description 14
- 239000010865 sewage Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims description 48
- 238000005303 weighing Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 23
- 239000000843 powder Substances 0.000 abstract description 14
- 230000007246 mechanism Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 25
- 238000009472 formulation Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000003756 stirring Methods 0.000 description 7
- 210000004027 cell Anatomy 0.000 description 5
- 239000011268 mixed slurry Substances 0.000 description 4
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000306 recurrent effect Effects 0.000 description 2
- 238000009955 starching Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0422—Weighing predetermined amounts of ingredients, e.g. for consecutive delivery
- B28C7/044—Weighing mechanisms specially adapted therefor; Weighing containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
- B28C7/10—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of rotary members, e.g. inclinable screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Accessories For Mixers (AREA)
Abstract
The invention discloses an automatic control operation device for mixing mud. The automatic control operation device comprises a mud mixing tank, a conveyer, a storage bin, a water tank and a reversing valve, wherein a submersible sewage pump is arranged inside the mud mixing tank; the first end of the conveyer is communicated with the mud mixing tank; the second end of the conveyer is communicated with the storage bin; a water outlet of the water tank is communicated with the mud mixing tank; the reversing valve is respectively communicated with a discharge hole of the mud mixing tank and a construction site. When the automatic control operation device is used, a dry powder material is firstly put into the storage bin, water inside the water tank is conveyed to the mud mixing tank, meanwhile, the conveyer is started to convey the dry powder material into the mud mixing tank, then the submersible sewage pump is started to mix in cycle, finally, the reversing valve is reversed to be in a transmission state, and mud inside the mud mixing tank is conveyed to an appointed place. According to the invention, the mechanism integrating dry powder material storage, water supply control, feeding control, automatic mixing control and mud feeding control is achieved, mud with stable quality is provided for underground continuous wall construction, and the construction quality and the construction efficiency are greatly improved.
Description
Technical field
The present invention relates to foundation basic construction field, refer in particular to and a kind ofly safeguard the automatic control operation device of the stable mud mixing of cell wall for diaphram wall.
Background technology
Diaphram wall from grooving at the beginning, in order to safeguard the stable of cell wall, just must, toward perfusion mud in groove, make mud be full of all the time groove section space, until gone out groove by concrete replacement when placing concrete.In construction of diaphragm wall process, quality of mud fluid is most important, be directly connected to success or failure and the construction quality of construction, the preparation of mud is often all by manually operating at present, exist mixing speed slow, poor working environment, labour intensity is large, mud is inhomogeneous and the factor such as reinforced error has affected the preparation quality of mud.By literature search: China Patent No. is: 201220585779.4, name is called: a kind of full-automatic mixer metering device, this device comprises frame, water storage bucket, storage bin hopper, LOAD CELLS and switch board, switch board is installed in frame, LOAD CELLS is housed on switch board, on LOAD CELLS, is hung with water storage bucket and storage bin hopper.This device is mainly used in batching, deposit batching and the water after metering with switch board, water and batching come from the water storage bucket and the storage bin hopper that are suspended on the LOAD CELLS being contained on switch board, i.e. the metering of batching and water is by LOAD CELLS control, but this device is without agitating function.
Summary of the invention
Because the problems referred to above, the labour intensity that exists for mixing mud in prior art is large, mixing speed is slow, the deficiencies such as the inhomogeneous and reinforced error of the mud of poor working environment, mixing, the object of the present invention is to provide the automatic control operation device of mud mixing of the automatic managements such as a kind of energy accurate feed proportioning, fully stirring, slurry transportation, improve mixing efficiency and the quality of mud.
For achieving the above object, the invention provides the automatic control operation device of a kind of mud mixing, comprising:
Slurry mixing tank, described in mix in slurry cylinder and be provided with a submersible sewage pump;
Conveyer, the first end of described conveyer with described in mix slurry cylinder and be connected;
Storage bin, the second end of described conveyer is connected with described storage bin;
Tank, the delivery port of described tank with described in mix slurry cylinder and be connected;
Reversal valve, is connected with described discharging opening and construction site of mixing slurry cylinder respectively.
When the automatic control operation device of mud mixing of the present invention uses, first dry powder formulation is put into storage bin, then again the water in tank is transported to and mixes slurry cylinder, in this process, starting conveyer is transported to dry powder formulation to mix in slurry cylinder, then start submersible sewage pump circulation stirring, finally reversal valve is commutated to feed status, will mix the interior slurry transportation of slurry cylinder to given place.The automatic control operation device of mud mixing of the present invention has been realized and has been integrated the mechanism that dry powder formulation stores, send water management, feeding control, automatic stirring control, send slurry to control, for construction of diaphragm wall provides stay-in-grade mud, construction quality and efficiency of construction are greatly improved.
The further improvement of the automatic control operation device of mud mixing of the present invention is, in described tank, be provided with an immersible pump, the delivery port of described immersible pump with described in mix slurry cylinder and be connected, described immersible pump with described in mix between slurry tin and be further provided with a flow sensor, can monitor the water yield of current.
The further improvement of the automatic control operation device of mud mixing of the present invention is, is further provided with a liquid level meter in described slurry mixing tank, can monitor the height of mixing liquid level in slurry cylinder.
The further improvement of the automatic control operation device of mud mixing of the present invention is, also comprises:
The hopper of weighing, described in being set up in by a pressure sensor, mixes by the described hopper of weighing on slurry cylinder, the discharging opening of the described hopper of weighing with described in mix slurry cylinder and be connected, described in the weigh feeding mouth of hopper and the first end of described conveyer be connected, the hopper of weighing can be monitored the weight of batching.
The further improvement of the automatic control operation device of mud mixing of the present invention is, described in weigh hopper and described in mix between slurry cylinder and be further provided with a baiting valve.
The further improvement of the automatic control operation device of mud mixing of the present invention is, is provided with a hopper wall vibrator on described storage bin, prevents that the batching in storage bin from piling up uneven.
The further improvement of the automatic control operation device of mud mixing of the present invention is, described in weigh on hopper and be provided with a hopper wall vibrator, the batching blanking inequality that prevents from weighing in hopper.
The further improvement of the automatic control operation device of mud mixing of the present invention is, described in mix on slurry cylinder and be provided with a guidance panel for setup parameter.
By above-mentioned improvement, when the automatic control operation device of mud mixing of the present invention uses, first set the weight of dry powder formulation by guidance panel, water consumption, the parameters such as mixing time, after setting completes, dry powder formulation is put into storage bin, then restart immersible pump, current in tank are entered and mixed slurry cylinder by flow sensor, in this process, starting conveyer is transported to dry powder formulation to weigh in hopper, when reaching, the water yield sets after the water yield, close immersible pump, when the dry powder formulation of weighing in hopper reaches after setting weight, close conveyer, open baiting valve, the batching of weighing in hopper is put into and mixed slurry cylinder, start submersible sewage pump circulation stirring to setting after mixing time, reversal valve is commutated to feed status, to mix the interior slurry transportation of slurry cylinder to given place, when mixing liquid level in slurry cylinder while reaching low liquid level, close submersible sewage pump, reversal valve is commutated to recurrent state, carry out next flow process.In whole operating process, hopper wall vibrator can prevent the batching that the batching in storage bin is piled up inequality and prevented from weighing in hopper
Blanking inequality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the automatic control operation device of mud mixing of the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Coordinate referring to shown in Fig. 1, the automatic control operation device 1 of mud mixing of the present invention, comprising:
Slurry mixing tank 10, is welded with in described slurry mixing tank 10 and forces current to become gyrate deflector, and the barrel of described slurry mixing tank 10 has water inlet and circulation stirring inlet port; Described mixing in slurry cylinder 10 is provided with a submersible sewage pump 110, plays circulation stirring and carries outward two effects; In described slurry mixing tank 10, be provided with a liquid level meter 120, be arranged at and approach two places that described submersible sewage pump 110 pump Senior Three are divided, can monitor the height of mixing slurry cylinder 10 interior liquid levels, in the time mixing the mud level arrival liquid level meter 120 of starching in cylinder 10, liquid level meter 120 is controlled submersible sewage pump 110 and is stopped; Described mixing on slurry cylinder 10 is also provided with a guidance panel 130 for setup parameter;
The hopper 20 of weighing, for monitoring the weight of batching, described in the hopper 20 of weighing mix on slurry cylinder 10 described in being set up in by frame 200, described in weigh on hopper 20 and be provided with a pressure sensor 210, the measurement category of this pressure sensor 210 is 200g～200kg; Described discharging opening of weighing hopper 20 is provided with a baiting valve 220, described baiting valve 220 with described in mix slurry cylinder 10 and be connected, described pressure sensor 210 by the startup of the weigh value control baiting valve 220 of setting with close; On the described hopper 20 of weighing, be also provided with a hopper wall vibrator 60, the batching blanking inequality that prevents from weighing in hopper 20;
Conveyer 70, is Shaftless screw conveyor, for delivery of batching, the first end 710 of described conveyer 70 with described in the weigh feeding mouth of hopper 20 be connected, described pressure sensor 210 stops by conveyer 70 described in the weigh value control of setting;
Storage bin 30, for store ingredients, the second end 720 of described conveyer 70 is connected with described storage bin 30, is also provided with a hopper wall vibrator 60 on described storage bin 30, prevents that the batching in storage bin 30 from piling up uneven;
Tank 40, in described tank 40, be provided with an immersible pump 410, the delivery port of described immersible pump 410 with described in mix slurry cylinder 10 and be connected, described immersible pump 410 and described in mix between slurry cylinder 10 and be further provided with a flow sensor 420, this flow sensor 420 is turbine flow transducer, and described flow sensor 420 stops and controlling the startup of submersible sewage pump 110 by the water yield value control immersible pump 410 of setting;
Reversal valve 50, for electric three-way reversal valve, the primary outlet of described reversal valve 50 with described in mix slurry cylinder 10 discharging opening be connected, second outlet of described reversal valve 50 is connected with construction site, the 3rd outlet of described reversal valve 50 is connected with described submersible sewage pump 110; Reversal valve 50 can be operated by manual or electronic two kinds of methods, the program that electromotive signal comes from described liquid level meter 120 and sets.
When the automatic control operation device 1 of mud mixing of the present invention uses, first pass through guidance panel
130 set the weight of dry powder formulation, water consumption, the parameters such as mixing time, after setting completes, dry powder formulation is put into storage bin 30, then restart immersible pump 410, current in tank 40 are entered and mixed slurry cylinder by flow sensor 420, in this process, starting conveyer 70 is transported to dry powder formulation to weigh in hopper 20, when reaching, the water yield of carrying sets after the water yield, close immersible pump 410 and start submersible sewage pump 110, when the dry powder formulation of weighing in hopper 20 reaches after setting weight, close conveyer 70, open baiting valve 220, the batching of weighing in hopper 20 is put into and mixed slurry cylinder 10, circulation stirring is to setting after mixing time, reversal valve 50 is commutated to feed status, to mix the slurry transportation of starching in cylinder 10 to given place, when mixing liquid level in slurry cylinder 10 while reaching low liquid level, close submersible sewage pump 110, reversal valve 50 is commutated to recurrent state, carry out next flow process.In whole operating process, hopper wall vibrator 60 can prevent the batching blanking inequality that the batching in storage bin 30 is piled up inequality and prevented from weighing in hopper 20.
The above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (8)
1. the automatic control operation device of mud mixing, is characterized in that comprising:
Slurry mixing tank, described in mix in slurry cylinder and be provided with a submersible sewage pump;
Conveyer, the first end of described conveyer with described in mix slurry cylinder and be connected;
Storage bin, the second end of described conveyer is connected with described storage bin;
Tank, the delivery port of described tank with described in mix slurry cylinder and be connected;
Reversal valve, is connected with described discharging opening and construction site of mixing slurry cylinder respectively.
2. the automatic control operation device of mud mixing as claimed in claim 1, it is characterized in that being provided with in described tank an immersible pump, the delivery port of described immersible pump with described in mix slurry cylinder and be connected, described immersible pump with described in mix between slurry tin and be further provided with a flow sensor.
3. the automatic control operation device of mud mixing as claimed in claim 1, is characterized in that being further provided with in described slurry mixing tank a liquid level meter.
4. the automatic control operation device of mud mixing as claimed in claim 1, characterized by further comprising:
The hopper of weighing, described in weigh that to mix slurry cylinder described in being set up in by a pressure sensor upper for hopper, described in weigh hopper discharging opening with described in mix slurry tin and be connected, described in the weigh feeding mouth of hopper and the first end of described conveyer be connected.
5. the automatic control operation device of mud mixing as claimed in claim 4, described in it is characterized in that, weigh hopper and described in mix between slurry cylinder and be further provided with a baiting valve.
6. the automatic control operation device of mud mixing as claimed in claim 1, is characterized in that being provided with on described storage bin a hopper wall vibrator.
7. the automatic control operation device of mud mixing as claimed in claim 4, is provided with a hopper wall vibrator on the hopper of weighing described in it is characterized in that.
8. the automatic control operation device of the mud mixing as described in any one in claim 1 to 7, mixes described in it is characterized in that on slurry cylinder and is provided with a guidance panel for setup parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410164171.8A CN103909579B (en) | 2014-04-23 | 2014-04-23 | Mud mixing automatically controls operation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410164171.8A CN103909579B (en) | 2014-04-23 | 2014-04-23 | Mud mixing automatically controls operation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103909579A true CN103909579A (en) | 2014-07-09 |
| CN103909579B CN103909579B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410164171.8A Active CN103909579B (en) | 2014-04-23 | 2014-04-23 | Mud mixing automatically controls operation device |
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| Country | Link |
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| CN (1) | CN103909579B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989301A (en) * | 2015-07-17 | 2015-10-21 | 河海大学 | Device capable of automatically preparing high-quality slurry |
| CN107140392A (en) * | 2017-05-05 | 2017-09-08 | 温州中环正源水务有限公司 | A kind of sludge conveying system |
| CN107443573A (en) * | 2017-08-25 | 2017-12-08 | 上海隧道工程有限公司 | A kind of full-automatic mud mixing method |
| CN107553717A (en) * | 2017-08-25 | 2018-01-09 | 上海隧道工程有限公司 | A kind of full-automatic mud mixing system |
| CN109877973A (en) * | 2019-03-18 | 2019-06-14 | 广东省长大公路工程有限公司 | A kind of UHPC material feed proportioning system and its application |
| CN111844441A (en) * | 2019-12-31 | 2020-10-30 | 申旭正 | A cement slurry feeding device |
| CN111958835A (en) * | 2020-09-09 | 2020-11-20 | 山东奥英重工科技设备有限公司 | A kind of red mud pulping equipment and control system |
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|---|---|---|---|---|
| CN1652908A (en) * | 2001-06-20 | 2005-08-10 | 株式会社大林组 | Weighing equipment for concrete material |
| CN101456214A (en) * | 2008-11-19 | 2009-06-17 | 陕西长大西筑路面机械科技有限公司 | Novel stirring station |
| CN203063775U (en) * | 2012-12-18 | 2013-07-17 | 江阴市卡利格机械有限公司 | Concrete mixing vehicle with rotating-speed-controllable mixing tank |
| CN203228318U (en) * | 2012-12-27 | 2013-10-09 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Hydraulic-hybrid control system for concrete stirring carrier |
-
2014
- 2014-04-23 CN CN201410164171.8A patent/CN103909579B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652908A (en) * | 2001-06-20 | 2005-08-10 | 株式会社大林组 | Weighing equipment for concrete material |
| CN101456214A (en) * | 2008-11-19 | 2009-06-17 | 陕西长大西筑路面机械科技有限公司 | Novel stirring station |
| CN203063775U (en) * | 2012-12-18 | 2013-07-17 | 江阴市卡利格机械有限公司 | Concrete mixing vehicle with rotating-speed-controllable mixing tank |
| CN203228318U (en) * | 2012-12-27 | 2013-10-09 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Hydraulic-hybrid control system for concrete stirring carrier |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989301A (en) * | 2015-07-17 | 2015-10-21 | 河海大学 | Device capable of automatically preparing high-quality slurry |
| CN104989301B (en) * | 2015-07-17 | 2018-03-20 | 河海大学 | The device of high quality mud can be prepared automatically |
| CN107140392A (en) * | 2017-05-05 | 2017-09-08 | 温州中环正源水务有限公司 | A kind of sludge conveying system |
| CN107443573A (en) * | 2017-08-25 | 2017-12-08 | 上海隧道工程有限公司 | A kind of full-automatic mud mixing method |
| CN107553717A (en) * | 2017-08-25 | 2018-01-09 | 上海隧道工程有限公司 | A kind of full-automatic mud mixing system |
| CN109877973A (en) * | 2019-03-18 | 2019-06-14 | 广东省长大公路工程有限公司 | A kind of UHPC material feed proportioning system and its application |
| CN111844441A (en) * | 2019-12-31 | 2020-10-30 | 申旭正 | A cement slurry feeding device |
| CN111958835A (en) * | 2020-09-09 | 2020-11-20 | 山东奥英重工科技设备有限公司 | A kind of red mud pulping equipment and control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103909579B (en) | 2016-08-24 |
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Effective date of registration: 20151123 Address after: 200232 Shanghai city Xuhui District Wanping Road No. 1099 5 floor Applicant after: SHANGHAI TUNNEL ENGINEERING CO., LTD. Applicant after: SHANGHAI TUNNEL ENGINEERING CO., LTD. Applicant after: SHANGHAI TUNNEL FOUNDATION ENGINEERING CO., LTD. Address before: 200082 No. 118, Dalian Road, Shanghai, Yangpu District Applicant before: Shanghai Tunnel Engineering Co., Ltd. Applicant before: SHANGHAI TUNNEL FOUNDATION ENGINEERING CO., LTD. |
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