CN102288157B - Method for monitoring deep settlement of foundation - Google Patents
Method for monitoring deep settlement of foundation Download PDFInfo
- Publication number
- CN102288157B CN102288157B CN 201110219540 CN201110219540A CN102288157B CN 102288157 B CN102288157 B CN 102288157B CN 201110219540 CN201110219540 CN 201110219540 CN 201110219540 A CN201110219540 A CN 201110219540A CN 102288157 B CN102288157 B CN 102288157B
- Authority
- CN
- China
- Prior art keywords
- flush type
- pressure
- liquid
- settlement
- pressure transducer
- 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.)
- Active
Links
Images
Abstract
The invention relates to a method for monitoring the deep settlement of a foundation, which is characterized in that: a liquid level static pressure monitoring method is adopted; in the liquid level static pressure monitoring method, a container provided with a pressure sensor and a secondary instrument is adopted, taken as a pressure measuring reference container and fixed on the ground which is not influenced by the foundation settlement; the height of a pressure sensing surface of the pressure sensor is greater than that of any one embedded settlement instrument; the embedded settlement instrument consists of a shell, a three-way joint, a pressure sensor, a secondary instrument circuit and a serial bus circuit and is electrically connected with other embedded settlement instruments and a ground measurement and control system through an electric serial bus; and the measurement and control system records a pressure value of each detection point, converts the pressure value into a foundation settlement value, and performs curve fitting to obtain a foundation section settlement outline.
Description
Technical field
The present invention relates to a kind of monitoring method of settlement of foundation, particularly disclose a kind of method for monitoring deep settlement of foundation, belong to field of civil engineering.
Background technology
Construct on the ground, all can cause settlement of foundation such as buildings, highway, dam etc.Settlement of foundation method of testing in the past roughly is divided into two classes, and a class is that the pre-buried tubular type of vertical drilling is measured, and have advantage simple in structure, with low cost, but its precision is lower, and in work progress fragile causing of settlement monitoring pipe can't measure.Another kind of is the transverse section buried tube type, measures the method at inclination angle and indirectly measures, and has the higher advantage of precision, but its equally easily in work progress the pipe laying deformed damaged cause and can't measure.
Summary of the invention
Purpose of the present invention addresses the deficiencies of the prior art, the method that adopts pressure differential detection principle and liquid level static pressure to detect, and design does not a kind ofly affect the flush type detection method of construction reliably, and the assurance measuring accuracy.
The present invention is achieved in that a kind of method for monitoring deep settlement of foundation, it is characterized in that: adopt liquid level static pressure monitoring method, described liquid level static pressure monitoring method adopts the container that pressure transducer and secondary instrument are installed, be fixed on and be not subjected on the ground that settlement of foundation affects as the measuring pressure basis container, and the height of the pressure-sensitive face of pressure transducer wherein is higher than the height of any one flush type sedimentometer, the benchmark container links to each other with the three-way interface of at least one flush type sedimentometer on imbedding tested ground by liquid line, the water delivering orifice of last flush type sedimentometer connects the valvular liquid line of a band, extends to beyond the operation side; Described flush type sedimentometer is made of housing, threeway, pressure transducer, secondary instrument circuit and universal serial bus circuit, the pressure transducer of flush type sedimentometer is connected to an interface of threeway, two other interface of threeway can link to each other by the liquid of liquid line with ground benchmark container and other flush type sedimentometer, and the flush type sedimentometer can be electrically connected by electric universal serial bus and other flush type sedimentometer and ground observing and controlling system; Described flush type sedimentometer is cascaded by liquid line and electric universal serial bus, and before foundation construction, shallow embedding enters underground, and links to each other with TT﹠C system with ground benchmark container with electric universal serial bus by liquid line; Pour into liquid in the described benchmark container, until liquid is full of the whole piece liquid line, till being with valvular pipeline to have liquid to flow out, with the valve locking, continue afterwards in the benchmark container, to pour into liquid, until liquid level reaches 50% ~ 80% of benchmark vessel volume.
Described TT﹠C system is read the force value of each pressure transducer
P i , by pressure elevation reduction formula, calculate each pressure transducer pressure-sensitive face with respect to the height value of liquid level
h i
The pressure elevation converts and can finish by following formula:
?，
Wherein:
PBe force value,
ρBe the density of liquid,
gBe acceleration of gravity,
hBe the height of benchmark vessel level to pressure transducer pressure-sensitive face.
The height value that described TT﹠C system converses the pressure transducer on the benchmark container
h 0 The height value that converses with pressure transducer in each sedimentometer
h i Subtract each other, obtain
Δ h i , as the altitude datum value record of each sedimentometer before the settlement of foundation in TT﹠C system.Namely have:
?，
Wherein:
iNumbering for sedimentometer.
Described each flush type sedimentometer since wherein pressure transducer and the liquid level of benchmark container change, produce one from foundation construction before the different force value that is recorded
P Ij , TT﹠C system records these values and converts and can obtain each sedimentometer this moment and to be installed in the liquid level value that is not subjected to the benchmark container that settlement of foundation affects
h Ij Record simultaneously the force value of the pressure transducer on the benchmark container
P 0j , and converse the height value of itself and benchmark vessel level
h 0j
Described TT﹠C system will
h 0j With each
h Ij Subtract each other, obtain
Δ h Ij , as behind the settlement of foundation
jDuring inferior detection, the height value of sedimentometer.Namely have:
Wherein:
iNumber for sedimentometer.
Each that will calculate respectively after the described TT﹠C system
Δ h Ij With record before the settlement of foundation each
Δ h i Subtract each other, can obtain
jDuring inferior detection, the sedimentation value of sedimentometer.Namely have:
Wherein:
S Ij Be
iIndividual sedimentometer
jDuring inferior detection, the sedimentation value that ground is front with respect to construction.
The invention has the beneficial effects as follows: method for monitoring deep settlement of foundation of the present invention adopts the force value of a pressure transducer that is not subjected to settlement influence as benchmark, is subjected to settlement influence with pressure transducer in other flush type sedimentometer and the force value that changes is compared and obtained sedimentation value.Owing to adopt same fluid pipeline, so the impact that not changed by external atmosphere pressure and owing to adopt the conversion pressure measuring method, has also reduced manyly so be acted upon by temperature changes, these advantages are to adopt other monitoring method unexistent.
The great advantage of method for monitoring deep settlement of foundation of the present invention is not affect construction, can greatly improve operating efficiency, and can not caused measurement point to be scrapped by the construction operation damage.By the remote-transmission module of in TT﹠C system, installing, the sedimentation value of construction area All Jobs monitoring point under all right Centralized Monitoring.
Description of drawings
Fig. 1 is the liquid level static pressure monitoring method schematic diagram of the inventive method.
Fig. 2 is the scheme of installation of liquid level static pressure monitoring system of the present invention before foundation construction.
Fig. 3 is the A section enlarged drawing of Fig. 2.
Fig. 4 is that the sedimentation view occurs behind foundation construction liquid level static pressure monitoring system.
Among the figure: 1, secondary instrument circuit board; 2, pressure transducer; 3, reference field; 4, liquid; 5, benchmark container; 6, liquid line; 7, universal serial bus; 8, TT﹠C system; 9, flush type sedimentometer; 10, valve; 11, water inlet; 12, gas outlet; 13, water delivering orifice; 14, ground; 15, earth and rock works; 16, sedimentation datum plate; 17, Inlet and outlet water interface; 18, threeway; 19, housing; 20, hermetically-sealed cable interface.
Embodiment
With reference to the accompanying drawings 1,2,3 and 4, a kind of method for monitoring deep settlement of foundation of the present invention, it adopts liquid level static pressure monitoring method.Liquid level static pressure monitoring method is to adopt the container that pressure transducer 2 and secondary instrument are installed, it is upper as measuring pressure basis container 5 to be fixed on the ground (being reference field 3) that not affected by settlement of foundation, and the height of the pressure-sensitive face of pressure transducer wherein is higher than the height of any one flush type sedimentometer 9, the benchmark container links to each other with the three-way interface of at least one flush type sedimentometer 9 on imbedding tested ground by liquid line, the water delivering orifice 13 of last flush type sedimentometer 9 connects the liquid line with valve 10, extends to beyond the operation side.
Pour into liquid 4 in the benchmark container 5, until liquid 4 is full of whole piece liquid line 6, till the pipeline with valve 10 has liquid to flow out, with valve 10 lockings, continue afterwards in benchmark container 5, to pour into liquid 4, until liquid level reaches 50% ~ 80% of benchmark vessel volume.
With reference to the accompanying drawings 2,3 and 4, the inventive method liquid level static pressure monitoring method has adopted three flush type sedimentometers to install before foundation construction.
At benchmark container 5 water inlet 11, gas outlet 12, water delivering orifice 13 are arranged, its bottom is equipped with pressure transducer 2 and reaches supporting with it secondary instrument circuit board 1, and secondary instrument circuit board 1 links to each other with each flush type sedimentometer with TT﹠C system 8 by universal serial bus 7.Pressure transducer 2 wherein can perception liquid 4 pressure, and be converted to electric weight and pass to secondary instrument circuit board 1, by the digitized processing of secondary instrument circuit board 1, change digital signal into and pass to TT﹠C system 8.
The flush type sedimentometer is made of enclosure-type housing 19, sedimentation datum plate 16, threeway 18, Inlet and outlet water interface 17, pressure transducer 2, secondary instrument circuit board 1, universal serial bus 7 and hermetically-sealed cable interface 20.The pressure of the liquid 4 that the pressure-sensitive face of pressure transducer 2 can be injected by benchmark container 5 by threeway 18 perception, and be converted to electric weight, the digitized processing through secondary instrument circuit board 1 becomes serial signal, passes to TT﹠C system 8 by universal serial bus 7.
The present invention adopts liquid level static pressure monitoring method embodiment as follows:
On the reference field 3 of the settlement influence of not constructed, settle benchmark container 5, its setting height(from bottom) is higher than arbitrary flush type sedimentometer.Before ground 14 constructions, with liquid line 6 that container 5 and all settlement monitors 9 are interconnected, with universal serial bus TT﹠C system 8 is linked to each other with all settlement monitors 9.Afterwards, shallow embedding settlement monitor 9 on ground, and can be water, anti freezing solution etc. to benchmark container 5 filling liquid 4(by water inlet 11), until valve 10 overflows, extrude all gas in the liquid line 6 with this.At this moment, valve-off continues filling liquid, until exceed 50%～80% of benchmark container 5 capacity.
Owing to pressure differential is arranged and is converted to electric weight between the liquid level of pressure transducer 2 perception in each settlement monitor 9 and the liquid level of pressure transducer 2 perception in the benchmark container, receive and record these values by TT﹠C system 8 by secondary instrument circuit 1, universal serial bus 7, as the front reference value of construction on the ground 14 (such as the earth and rock works 15 of piling up etc.).
According to the pressure altitude reduction formula:
Can learn that the value according to liquid level that each pressure transducer is responded to is before ground 14 constructions:
Wherein:
h 0 For the pressure-sensitive face of the pressure transducer 2 on the benchmark container 5 poor with the liquid level of liquid 4;
P 0 Be the force value of its perception,
h i The pressure-sensitive face that is i pressure transducer (i=1,2,3) is poor with the liquid level of liquid 4;
P i It is the force value of i pressure transducer perception.
At this moment, the pressure transducer on the benchmark container 5 and the alternate position spike between the pressure transducer in each sedimentometer are:
?，
TT﹠C system 8 is preserved these differences, as the sedimentation reference value before the foundation construction.
Begin afterwards earth and rock works 15 construction operations, in the process of construction and subsequent in the several years, settlement monitor 9 will the sedimentation along with the sedimentation of ground.The alternate position spike of itself and ground benchmark container 5 will change thereupon, corresponding, difference in height between the liquid level of the liquid 4 in the pressure-sensitive face of the pressure transducer 2 in the sedimentometer and the ground benchmark container 5 will be along with change, and the pressure transducer below the benchmark container 5 and the difference in height of liquid level then remain unchanged.With these variable quantities of perception and be converted to electric weight, TT﹠C system 8 is in record these differences again, with value before the sedimentation relatively, converting by pressure-degree of depth to draw the settlement of foundation value.
It is as follows to begin pressure in the rear sedimentometer-height change value with the formulae express settlement of foundation:
Wherein:
h 0j Be
jDuring inferior monitoring, the pressure-sensitive face of the pressure transducer 2 on the benchmark container 5 is poor with the liquid level of liquid 4;
P 0j Be the force value of its perception,
h Ij The pressure-sensitive face that is i pressure transducer (i=1,2,3) is poor with the liquid level of liquid 4.
Each that will calculate respectively after the described TT﹠C system
Δ h Ij Each that records before (i=1,2,3) and the settlement of foundation
Δ h i Subtract each other, can obtain
jDuring inferior detection, the sedimentation value of sedimentometer.Namely have:
Wherein:
S Ij Be
iIndividual sedimentometer
jDuring inferior detection, the sedimentation value that ground is front with respect to construction.
Claims (1)
1. method for monitoring deep settlement of foundation, it is characterized in that: adopt liquid level static pressure monitoring method, described liquid level static pressure monitoring method adopts the container that pressure transducer and secondary instrument are installed, be fixed on and be not subjected on the ground that settlement of foundation affects as the measuring pressure basis container, and the height of the pressure-sensitive face of pressure transducer wherein is higher than the height of any one flush type sedimentometer, the benchmark container links to each other with the three-way interface of at least one flush type sedimentometer on imbedding tested ground by liquid line, the water delivering orifice of last flush type sedimentometer connects the valvular liquid line of a band, extends to beyond the operation side; Described flush type sedimentometer is made of housing, threeway, pressure transducer, secondary instrument circuit and universal serial bus circuit, the pressure transducer of flush type sedimentometer is connected to an interface of threeway, two other interface of threeway links to each other by the liquid of liquid line with ground benchmark container and other flush type sedimentometer, and the flush type sedimentometer is electrically connected by electric universal serial bus and other flush type sedimentometer and ground observing and controlling system; Described flush type sedimentometer is cascaded by liquid line and electric universal serial bus, and before foundation construction, shallow embedding enters underground, and links to each other with TT﹠C system with ground benchmark container with electric universal serial bus by liquid line; Pour into liquid in the described benchmark container, until liquid is full of the whole piece liquid line, till being with valvular pipeline to have liquid to flow out, with the valve locking, continue afterwards in the benchmark container, to pour into liquid, until liquid level reaches 50% ~ 80% of benchmark vessel volume; Described TT﹠C system is read the force value of each pressure transducer at this moment, records simultaneously the force value of the pressure transducer of terrestrial reference container; Described each flush type sedimentometer is in the foundation construction process and subsequent in during the several years, can produce sedimentation along with the sedimentation of ground, this moment wherein pressure transducer can produce one from foundation construction before the different force value that is recorded, TT﹠C system record these values and with construction before the force value that is recorded relatively, can draw the settlement of foundation value of each check point through converting, through curve, obtain ground Settlement Profiler profile again, computing formula is
,
S Ij Be
iIndividual flush type sedimentometer
jDuring inferior detection, the sedimentation value that ground is front with respect to construction,
Δ h i Be the difference in height that i flush type sedimentometer is initial and the benchmark container converses,
Δ h Ij Be the difference in height that i flush type sedimentometer the j time converses with the benchmark container when detecting, formula is passed through in the conversion of pressure elevation
Finish, wherein:
PBe force value,
ρBe the density of liquid,
gBe acceleration of gravity,
hBe the liquid level of the benchmark container height to pressure transducer pressure-sensitive face, the height value that converses after pressure transducer is measured in the height value that the pressure transducer on the benchmark container is conversed and each flush type sedimentometer subtracts each other, and obtains
Δ h
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110219540 CN102288157B (en) | 2011-08-02 | 2011-08-02 | Method for monitoring deep settlement of foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110219540 CN102288157B (en) | 2011-08-02 | 2011-08-02 | Method for monitoring deep settlement of foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102288157A CN102288157A (en) | 2011-12-21 |
| CN102288157B true CN102288157B (en) | 2013-01-23 |
Family
ID=45334783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110219540 Active CN102288157B (en) | 2011-08-02 | 2011-08-02 | Method for monitoring deep settlement of foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102288157B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007854A (en) * | 2017-11-07 | 2018-05-08 | 芜湖赛宝信息产业技术研究院有限公司 | A kind of real-time automatic monitoring device of novel salt fog sedimentation rate |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607518B (en) * | 2012-02-22 | 2016-05-18 | 石家庄铁道大学 | Horizontal multiple spot settlement monitoring device and the monitoring method thereof measured based on fluid power |
| CN102620715A (en) * | 2012-04-16 | 2012-08-01 | 河海大学 | Observation method of foundation settlement based on liquid level difference |
| CN102721407B (en) * | 2012-07-06 | 2014-08-06 | 中国石油大学(华东) | Device and method for measuring ground surface settlement of underground salt cavern gas storage |
| CN103499340B (en) * | 2013-09-27 | 2015-06-10 | 河海大学 | Measurement device and measurement method for vertical great-height difference height transmission |
| CN104792304B (en) * | 2015-04-29 | 2018-01-02 | 中交上海三航科学研究院有限公司 | Fluid pressure type laminated settlement meter and method for embedding, measuring method |
| CN104976988B (en) * | 2015-07-14 | 2024-03-01 | 江苏省电力公司南京供电公司 | Tunnel large-elevation-difference sedimentation measurement system |
| CN105095671B (en) * | 2015-08-24 | 2018-08-14 | 三峡集团西藏能源投资有限公司 | Settle Monitoring and forecasting system in real-time instrument and system and implementation method |
| CN107655452A (en) * | 2017-10-19 | 2018-02-02 | 罗锦华 | Hydraulic sensing formula settlement observation system |
| CN107727065B (en) * | 2017-11-08 | 2023-10-24 | 山东科技大学 | Drilling sedimentation deformation monitoring system and monitoring method thereof |
| CN108731635A (en) * | 2018-07-12 | 2018-11-02 | 浙江省水利水电勘测设计院 | A kind of dam profundal zone large deformation settlement observer and method |
| CN109458982A (en) * | 2018-11-27 | 2019-03-12 | 山东康威通信技术股份有限公司 | A kind of tunnel subsidence monitoring device and method |
| CN111058435B (en) * | 2019-11-29 | 2021-09-21 | 上海建工集团股份有限公司 | Method and device for layered settlement monitoring of deep soil body of soft soil stratum |
| CN111058436A (en) * | 2019-11-29 | 2020-04-24 | 上海建工集团股份有限公司 | Radial implantation device and method for settlement signal marker in soft soil stratum drill hole |
| CN113155086B (en) * | 2021-02-26 | 2022-11-25 | 广西北投交通养护科技集团有限公司 | Device and method for monitoring section settlement of filling subgrade in highway reconstruction and extension |
| CN113483734A (en) * | 2021-06-29 | 2021-10-08 | 中石化宁波工程有限公司 | Device and method for monitoring embankment settlement |
| CN115493557B (en) * | 2022-10-18 | 2023-07-25 | 杭州余杭建筑设计院有限公司 | Building foundation subsides measuring device |
| CN116481491B (en) * | 2023-06-20 | 2023-08-29 | 深圳市勘察研究院有限公司 | Deep foundation pit ground subsidence monitoring devices |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0561318A1 (en) * | 1992-03-19 | 1993-09-22 | Hitachi, Ltd. | Foundation and manufacturing method therefor, and method and apparatus for measuring vertical sinkage of foundation |
| CN201567560U (en) * | 2009-12-30 | 2010-09-01 | 山东大学 | Digital settlement device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07306040A (en) * | 1994-05-11 | 1995-11-21 | Tokyo Sokki Kenkyusho:Kk | Displacement meter |
| JP3725815B2 (en) * | 2001-11-15 | 2005-12-14 | 株式会社奥村組 | Height difference measuring apparatus and height difference measuring method |
-
2011
- 2011-08-02 CN CN 201110219540 patent/CN102288157B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0561318A1 (en) * | 1992-03-19 | 1993-09-22 | Hitachi, Ltd. | Foundation and manufacturing method therefor, and method and apparatus for measuring vertical sinkage of foundation |
| CN201567560U (en) * | 2009-12-30 | 2010-09-01 | 山东大学 | Digital settlement device |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2003-148954A 2003.05.21 |
| JP特开平7-306040A 1995.11.21 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007854A (en) * | 2017-11-07 | 2018-05-08 | 芜湖赛宝信息产业技术研究院有限公司 | A kind of real-time automatic monitoring device of novel salt fog sedimentation rate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102288157A (en) | 2011-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102288157B (en) | Method for monitoring deep settlement of foundation | |
| CN102494670A (en) | Method for monitoring foundation settlement by using static water level gauge and static water level gauges used in method | |
| CN103292774B (en) | A kind of dynamic deflection metrology method of bridge | |
| CN104976988B (en) | Tunnel large-elevation-difference sedimentation measurement system | |
| CN102121357A (en) | Drilling fluid return flow measuring method and measuring device thereof | |
| WO2016070626A1 (en) | On-line detection device and method for tension of suspension ropes or stabilising ropes in construction vertical shaft | |
| CN108691536A (en) | A kind of horizontal effective stress test method and test device | |
| CN102269578A (en) | Device for measuring vertical deformation of spatial structure | |
| CN101787712A (en) | Inclination measuring device and measuring method of sunk well | |
| CN201392265Y (en) | Bridge deflection intelligent monitoring device | |
| CN202372170U (en) | Static level instrument | |
| CN208547406U (en) | A kind of oily whey interface liquid level gauge of hydrometer method measurement | |
| CN203534644U (en) | Gas pumping and exhausting pipeline flow measuring device | |
| CN203274737U (en) | Replaceable seawall subsidence monitoring device | |
| CN102864794B (en) | Method for monitoring displacement of anchor structure by utilizing pressure difference | |
| CN201803708U (en) | Device for measuring vertical deformation of space structure | |
| CN201606060U (en) | Mud pressure and density logging instrument | |
| CN107702740B (en) | Underwater foundation grouting fullness monitoring system and method | |
| CN207813607U (en) | A kind of horizontal effective stress test device | |
| CN107560595A (en) | Building and geology Monitoring method of the subsidence | |
| CN101624831B (en) | Open caisson capable of warning in construction and early warning method thereof | |
| CN206132048U (en) | Subside a glass monitoring system | |
| CN204875752U (en) | Geotechnical engineering deviational survey pipe | |
| CN215064774U (en) | High-precision water level automatic measuring and monitoring device | |
| CN115854851B (en) | Goaf earth surface movement deformation monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 1111, Level 11, E Section 1515, Zhongshan North Second Road, Hongkou District, Shanghai, 200092 Patentee after: Shanghai Tonghe Engineering Technology Co., Ltd. Address before: 200092 Shanghai city Yangpu District Guokang Road No. 46 Tongji Science and Technology Building Room 1403 Patentee before: Toehold Civil Engineering Technology Co., Ltd., Shanghai |