CN108331586B - Safe replacement device for soil pressure sensor - Google Patents
Safe replacement device for soil pressure sensor Download PDFInfo
- Publication number
- CN108331586B CN108331586B CN201810151394.9A CN201810151394A CN108331586B CN 108331586 B CN108331586 B CN 108331586B CN 201810151394 A CN201810151394 A CN 201810151394A CN 108331586 B CN108331586 B CN 108331586B
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- China
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- base
- pressure sensor
- soil pressure
- shield machine
- inserting plate
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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
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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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 invention relates to a safe replacement device of a soil pressure sensor, which comprises: the mounting hole is formed in the shield machine shell and communicated with an excavation cabin positioned in the front of the shield machine shell and the inside of the shield machine shell; the inserting plate is arranged in the shield machine shell and is arranged at the mounting hole, the inserting plate can slide on the shield machine shell, and the mounting hole is plugged by the inserting plate through sliding the inserting plate; and the soil pressure sensor is inserted in the mounting hole and is detachably connected with the inserting plate. The invention has the beneficial effects that: adopt slidable picture peg for before the base takes off from the picture peg together with soil pressure sensor, only slide the picture peg and can block up the mounting hole that is used for holding soil pressure sensor on the shield casing body, avoid excavating the underground muddy water in the storehouse and flow into the shield machine backward, and then the dismouting labour saving and time saving and the risk of soil pressure sensor are minimum when making the maintenance.
Description
Technical Field
The invention relates to equipment for shield tunnel construction, in particular to a safe replacement device for an earth pressure sensor, which belongs to the field of tunnel construction machinery.
Background
In China, the shield tunneling machine is widely applied to construction of subways, large-diameter tunnels, underground pipelines and the like by virtue of excellent ground settlement control, high excavation efficiency and wide bottom layer adaptability. The earth pressure balance shield machine is most widely applied to the construction of small-diameter tunnels such as subways. The most important characteristic of the earth pressure balance shield machine is to keep the balance between the pressure in the excavation chamber of the shield tunneling machine and the earth pressure on the front side of the earth body so as to prevent the settlement or the uplift of the ground, and the monitoring of the pressure in the excavation chamber of the shield tunneling machine is very important. The pressure sensor used for monitoring the pressure of the excavated bin is called as an earth pressure sensor, and a signal transmitted by the earth pressure sensor reaches a monitoring room, so that a worker can dynamically master the change of the pressure in the excavated bin. When the pressure in the excavation bin is abnormal, constructors can know the pressure through a signal sent back by the soil pressure sensor, and therefore corresponding countermeasures are taken. Once the sensors fail, the shield machine continues to tunnel at great risk.
At present, the remedial measure for the damage of the soil pressure sensor is to make workers enter an excavation bin for maintenance. However, working into the excavation chamber is a very risky operation in shield construction, and the efficiency is low, so that the measure cannot be taken in a very large way.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a safe replacement device for a soil pressure sensor, which can solve the problems of high maintenance risk and much time consumption of the prior sensor.
The technical scheme for realizing the purpose is as follows:
the invention provides a safe replacement device for a soil pressure sensor, which comprises:
the mounting hole is formed in the shield machine shell and communicated with an excavation cabin positioned in the front of the shield machine shell and the inside of the shield machine shell;
the inserting plate is arranged in the shield machine shell and is arranged at the mounting hole, the inserting plate can slide on the shield machine shell, and the mounting hole is plugged by the inserting plate through sliding the inserting plate; and
and the soil pressure sensor is inserted into the mounting hole and is detachably connected with the inserting plate.
The invention has the beneficial effects that the slidable plugboard is adopted, so that when the soil pressure sensor is disassembled, the plugging part can be used for plugging the mounting hole on the shield machine shell through sliding the plugboard, underground muddy water in an excavated bin is prevented from flowing back into the shield machine when the soil pressure sensor is disassembled, and further, the disassembly and the assembly of the soil pressure sensor are time-saving and labor-saving and the risk is extremely low when the soil pressure sensor is maintained.
The safe soil pressure sensor replacing device is further improved by comprising a base, wherein a connecting surface for mounting the soil pressure sensor is formed on the side part of the base, which is close to the excavation bin, and the base is detachably connected to the inserting plate.
The safe replacement device for the soil pressure sensor is further improved in that the inserting plate is connected with a guide piece positioned in the shield machine shell, the guide piece is in threaded connection with a limiting piece, and the limiting piece is adjusted to abut against the side surface, positioned in the shield machine shell, of the base, so that supporting force towards the excavation cabin direction is provided for the base.
The safe replacement device for the soil pressure sensor is further improved in that the base is arranged on the inserting plate through a first bolt.
The safe replacement device for the soil pressure sensor is further improved in that a hole for the base to pass through is formed in the insertion plate corresponding to the mounting hole, a sealing strip is arranged at the position of the hole of the insertion plate, and a gap between the insertion plate and the base is sealed by the sealing strip.
The soil pressure sensor safety replacement device is further improved in that the sealing strip is arranged on the inner surface of the hole, so that in the process of disassembling the base, the sealing strip is always positioned between the inner surface of the hole and the outer surface of the base and blocks a gap between the inserting plate and the base.
The safe soil pressure sensor replacing device is further improved in that a cable hole for the communication cable of the soil pressure sensor to extend out is formed in the base, a second sealing ring is arranged at the cable hole on the side face, close to the excavation bin, of the base, and the gap between the base and the soil pressure sensor is sealed through the second sealing ring.
The safe soil pressure sensor replacing device is further improved in that the base comprises a first base and a second base embedded in the first base, the soil pressure sensor is mounted on the side face, close to the excavation bin, of the second base, and the side face, close to the excavation bin, of the soil pressure sensor is flush with the side face, close to the excavation bin, of the first base.
In the safety replacement device for an earth pressure sensor according to the present invention, a flange is formed on a side surface of the second base located inside the shield casing, an attachment surface is formed in the first base corresponding to the flange, and the flange is fixed to the attachment surface by a second bolt, so that the second base is fitted to the first base.
The safe replacement device for the soil pressure sensor is further improved in that a first sealing ring is arranged on the mounting surface of the first base, and the gap between the first base and the second base is sealed by the first sealing ring.
Drawings
Fig. 1 is a sectional view of a soil pressure sensor safety replacement device according to the present invention.
Fig. 2 is a schematic view illustrating the replacement of the soil pressure sensor using the safe soil pressure sensor replacement device according to the present invention.
Fig. 3 is a view in the direction a in fig. 1.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the present invention provides a safe replacement device for an earth pressure sensor, which is intended to safely pull out an earth pressure sensor damaged during a tunneling process from an excavated area for maintenance and safely install it back after maintenance, thereby improving construction safety and efficiency. The safety replacing device for soil pressure sensor according to the present invention will be described with reference to the accompanying drawings.
For convenience of description, the first side of the member is defined as the side close to the excavation chamber, and the second side of the member is defined as the side far from the excavation chamber.
Referring to fig. 1 and 3, a first side space of the shield machine housing 90 is an excavation chamber filled with underground muddy water and having a large pressure, a second side space of the shield machine housing 90 is the interior of the shield machine housing, the side is provided with the soil pressure sensor safety replacement device of the present invention, and the shield machine housing 90 is provided with a mounting hole for the soil pressure sensor 80 to extend into, and the mounting hole communicates the excavation chamber located at the front part of the shield machine housing with the interior of the shield machine housing. When in maintenance, maintenance personnel are positioned in the shield machine, the soil pressure sensor 80 is drawn out from the mounting hole of the shield machine shell 90 by using the safe soil pressure sensor replacing device for maintenance, and high-pressure underground muddy water in the excavation chamber is prevented from being filled into the shield chamber.
The invention relates to a safe replacement device of a soil pressure sensor, which comprises: the insert plate 10 is slidably installed at the second side of the shield casing 90, and the base is detachably installed at the second side of the insert plate 10, and the first side of the base is formed with a connection surface for installing the soil pressure sensor 80.
As shown in fig. 1 to 3, a sliding groove 12 is formed in the insertion plate 10, a fixing groove is formed in a second side of the shield machine housing 90 corresponding to the sliding groove 12, a limit bolt penetrates through the sliding groove 12 and is fixed to the corresponding fixing groove, and the insertion plate 10 can slide on the surface of the shield machine housing 90 along the sliding groove 12 by loosening the limit bolt. The insert plate 10 has a plugging portion having an area larger than that of the mounting hole of the shield casing 90 for plugging the mounting hole when the base is taken out, and a mounting portion having a hole corresponding to the mounting hole for the base to pass through the insert plate 10, the base being selectively drawn out or inserted into the hole. The hole is provided with a sealing strip 11, the gap between the inserting plate 10 and the base is sealed by the sealing strip 11, and preferably, the sealing strip 11 is arranged on the inner surface of the hole, so that in the process of drawing the base out of the hole, the sealing strip 11 is always positioned between the inner surface of the hole and the outer surface of the base and seals the gap between the inserting plate 10 and the base, and underground muddy water is prevented from seeping out of the gap and flowing into the inside of the shield tunneling machine.
Referring to fig. 1 and 3, the base includes a first base 30 and a second base 20 embedded in the first base 30, and the soil pressure sensor 80 is mounted on a first side of the second base 20. The first base 30 is a cylindrical member, and the second side is provided with a flange 32, in a preferred embodiment, the flange 32 is uniformly provided with a plurality of through holes, the inserting plate 10 is provided with threaded holes corresponding to the through holes, and a first bolt passes through the corresponding through hole and is screwed in the corresponding threaded hole on the inserting plate 10, so that the end surface of the flange 32 is tightly attached to the inserting plate 10, and the first base 30 passes through the hole on the inserting plate 10, thereby realizing the detachable installation of the first base 30 on the inserting plate 30. Preferably, the first bolts are four and evenly distributed on the flange 32, and the first side of the first base 30 is flush with the first side of the shield casing 90.
In another preferred embodiment, a plurality of through holes are uniformly formed on the flange 32, threaded holes are formed on the board 10 corresponding to the through holes, the guide members 40 pass through the corresponding through holes and are screwed in the corresponding threaded holes, the guide members 40 are threadedly connected with position-adjustable position-limiting members 41, and end surfaces of the position-limiting members 41 abut against the surface of the flange 32. Preferably, the limiting member 41 is an adjusting nut. When the soil pressure sensor operates normally, the position of the limiting member 41 is adjusted to be closest to the board 10, so that the end surface of the flange 32 is tightly attached to the board 10, and the first base 30 can be detachably mounted on the board 30. When the soil pressure sensor needs to be maintained, the first base 30 can be slowly pulled out by slowly adjusting the position of the limiting piece 41, the guide piece 40 plays a role in guiding in the pulling-out process, the limiting piece 41 always provides a supporting force for the first base 30 to offset the pressure of underground muddy water inside the excavation bin on the first base 30, and therefore the first base 30 is prevented from being suddenly popped out due to the pressure to hurt a maintenance worker in the pulling-out process. Preferably, there are four guides 40 evenly distributed on the flange 32. In addition, the guiding element 40 may also be arranged along the edge of the flange 32, and the limiting element includes a washer abutting against the surface of the first base 30 and an adjusting nut abutting against the washer.
It should be noted that the first base 30 can be more firmly installed on the board 10 by the first bolt, and the guide member 40 and the limiting member 41 can serve to slowly draw out the first base 30, and the two have different emphasis points, so that the soil pressure sensor safety replacement device can achieve the best effect when both are installed on the flange 32.
The second base 20 is also a cylindrical member, and the second side is provided with a flange 22, an accommodating space for accommodating the second base 20 and the soil pressure sensor 80 is formed in the first base 30, the size and shape of the accommodating space are matched with the size and shape of the second base 20 provided with the soil pressure sensor 80, and an installation surface is formed in the accommodating space corresponding to the flange 22 of the second base 20, so that a stepped structure is formed on the second side of the first base 30. The flange 22 of the second base 20 is uniformly provided with a plurality of through holes, the mounting surface is provided with threaded holes corresponding to the through holes, and second bolts pass through the corresponding through holes and are screwed in the corresponding threaded holes on the mounting surface, so that the end surface of the flange 22 of the second base 20 is tightly attached to the mounting surface, and the second base 20 can be detachably mounted on the first base 30. Preferably, the second bolts are four and evenly distributed on the flange 22 of the second base 20. The first sealing ring 31 is arranged on the mounting surface of the first base 30, the first sealing ring 31 is positioned between the mounting surface and the end surface of the flange 22 of the second base 20, and the first sealing ring 31 seals the gap between the first base 30 and the second base 20, so that underground muddy water is prevented from seeping out of the gap and flowing into the shield tunneling machine.
The second base 20 is provided with a cable hole 23 for the communication cable of the soil pressure sensor 80 to extend out, and the end surface of the first side of the second base 20 is provided with the soil pressure sensor 80. Preferably, an internal thread is formed at a position close to the soil pressure sensor 80 in the cable hole 23, a protrusion is formed on a second side end surface of the soil pressure sensor 80, an external thread is formed on the protrusion, and the soil pressure sensor 80 is in threaded connection with the second base 20 through the protrusion. In a preferred embodiment, the second sealing ring 21 is disposed on the end surface of the first side of the second base 20, the second sealing ring 21 is disposed along the outer periphery of the cable hole 23 and is located between the second base 20 and the soil pressure sensor 80, and the gap between the second base 20 and the soil pressure sensor 80 is sealed by the second sealing ring 21, so that the muddy water is prevented from seeping out of the gap and flowing into the cable hole 23.
Make soil pressure sensor 80 locate the first side of base with the mode of embedding through first base 30 and second base 20, soil pressure sensor 80 only first side contacts with the muddy water in the excavation storehouse, and takes out soil pressure sensor through taking whole base out when changing soil pressure sensor, can protect soil pressure sensor 80 betterly at the in-process of taking out to make soil pressure sensor 80's installation and the equal convenient and fast of dismantlement.
Preferably, when the first base 30 is mounted on the insert 10, the first side of the first base 30 is flush with the first side of the soil pressure sensor 80, so that when the base is drawn out, the first sides of the first base 30 and the soil pressure sensor 80 can be flush with the first side of the shield casing 90, so that the space in the hole of the insert 10 is filled with the first base 30 and the soil pressure sensor 80, and excessive muddy water is not brought out when the base is taken out after the insert 10 is slid.
The following describes a process of using the soil pressure sensor replacement safety device according to the present invention.
Referring to fig. 1 to 3, when the soil pressure sensor 80 needs to be repaired, first, four first bolts (i.e., bolts with corresponding reference numbers in fig. 3) connecting the first base 30 and the insert plate 10 are removed. Then the positions of the four retaining pieces 41 on the guide piece 40 are slowly adjusted, and the base can slowly and automatically withdraw from the excavation bin in the process of loosening the retaining pieces 41 because the muddy water in the excavation bin generates pressure on the base. When the base is withdrawn to the position shown in fig. 2, that is, the base is withdrawn from the mounting hole of the shield casing 90 but still in the hole of the insertion plate 10, the insertion plate 10 is slid so that the plugging portion of the insertion plate 10 plugs the mounting hole of the shield casing 90, and the base is also slid to the bottom due to the sliding of the insertion plate 10, so that the base can be completely pulled out to repair the soil pressure sensor 21. And after the maintenance is finished, the base can be reloaded by reversely operating the steps.
The safe replacement device for the soil pressure sensor has the beneficial effects that:
1. according to the safe replacement device for the soil pressure sensor, the base provided with the sensor can be pulled out, so that the sensor can be pulled out from the excavation cabin when being maintained, workers do not need to risk to enter the excavation cabin for maintenance, and the operation safety is greatly improved.
2. The safe replacement device for the soil pressure sensor has the advantages that the part structure is simple, the complex processing technology is not needed, the structural parts are all detachably mounted, and the mounting and the dismounting are convenient, so the construction efficiency is improved, and the construction period is shortened.
3. According to the safe replacement device for the soil pressure sensor, the sealing rings are arranged between the inserting plate and the first base, between the first base and the second base and between the second base and the soil pressure sensor, so that underground muddy water is effectively prevented from entering the shield machine.
4. According to the safe replacement device for the soil pressure sensor, the inserting plate slides downwards to plug the mounting hole of the shield machine shell before the base is completely extracted, so that the danger that muddy water flows backwards into the shield machine during maintenance is avoided.
5. According to the safe replacement device for the soil pressure sensor, the guide piece is arranged, so that the base cannot pop up suddenly under the huge pressure of underground muddy water when the base is pulled out, and the safety of maintenance workers is guaranteed.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (6)
1. The utility model provides a soil pressure sensor safety replacement device which characterized in that includes:
the mounting hole is formed in the shield machine shell and communicated with an excavation cabin positioned in the front of the shield machine shell and the inside of the shield machine shell;
the inserting plate is arranged in the shield machine shell and is arranged at the mounting hole, the inserting plate can slide on the shield machine shell, and the mounting hole is plugged by the inserting plate through sliding the inserting plate; and
the soil pressure sensor is inserted into the mounting hole and is detachably connected with the inserting plate;
the side part of the base, which is close to the excavation bin, is provided with a connecting surface for mounting the soil pressure sensor, and the base is detachably connected to the plugboard; the base comprises a first base and a second base embedded in the first base, the soil pressure sensor is mounted on the side surface, close to the excavation bin, of the second base, and the side surface, close to the excavation bin, of the soil pressure sensor is flush with the side surface, close to the excavation bin, of the first base;
the side surface of the second base, which is positioned in the shield machine shell, is provided with a flange, an installation surface is formed in the first base corresponding to the flange, and the flange is fixed on the installation surface through a second bolt, so that the second base is embedded in the first base.
2. The device for safely replacing the soil pressure sensor according to claim 1, wherein a guide member located inside the shield casing is connected to the inserting plate, a limiting member is connected to the guide member in a threaded manner, and the limiting member is adjusted to abut against a side surface of the base located inside the shield casing, so that a supporting force in the direction towards the excavation chamber is provided for the base.
3. The soil pressure sensor safety replacement device according to claim 1, wherein the base is attached to the insert plate by a first bolt.
4. The safe replacement device for the soil pressure sensor according to claim 1, wherein a hole for the base to pass through is formed in the insertion plate corresponding to the mounting hole, a sealing strip is arranged at the hole of the insertion plate, and the gap between the insertion plate and the base is sealed by the sealing strip.
5. The soil pressure sensor safety replacement device according to claim 4, wherein the sealing strip is provided on the inner surface of the hole, so that the sealing strip is always positioned between the inner surface of the hole and the outer surface of the base and blocks the gap between the insert plate and the base during the process of detaching the base.
6. The soil pressure sensor safety replacement device according to claim 1,
a first sealing ring is arranged on the mounting surface of the first base, and a gap between the first base and the second base is sealed by the first sealing ring;
offer the cable hole that the communication cable that supplies the soil to press the sensor stretches out on the second base, be equipped with the second sealing washer on the terminal surface of the first side of second base, the second sealing washer is followed the periphery setting of cable hole just is located between second base and the soil pressure sensor, through the shutoff of second sealing washer the second base with clearance between the soil pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810151394.9A CN108331586B (en) | 2018-02-14 | 2018-02-14 | Safe replacement device for soil pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810151394.9A CN108331586B (en) | 2018-02-14 | 2018-02-14 | Safe replacement device for soil pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108331586A CN108331586A (en) | 2018-07-27 |
| CN108331586B true CN108331586B (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810151394.9A Active CN108331586B (en) | 2018-02-14 | 2018-02-14 | Safe replacement device for soil pressure sensor |
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| CN (1) | CN108331586B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017933B (en) * | 2019-05-20 | 2024-02-06 | 厦门厦工中铁重型机械有限公司 | Soil pressure sensor changing device |
| CN110779647B (en) * | 2019-11-06 | 2021-09-28 | 河海大学 | Embedding device convenient for replacing soil pressure gauge and replacement method of soil pressure gauge |
| CN112268648B (en) * | 2020-11-16 | 2021-07-23 | 河海大学 | Baffle box for positioning soil pressure measuring instrument in hole, positioning device and positioning method |
| CN112483100B (en) * | 2021-01-04 | 2022-04-05 | 中铁工程装备集团有限公司 | Soil pressure sensor, valve replacing tool and replacing method thereof |
| CN112924067B (en) * | 2021-01-26 | 2022-06-17 | 中铁工程装备集团有限公司 | Soil pressure sensor changes device |
| CN112879029B (en) * | 2021-01-28 | 2022-01-18 | 安徽唐兴装备科技股份有限公司 | Rotary replacing device for earth pressure sensor of push bench |
| CN112780284B (en) * | 2021-01-29 | 2022-09-13 | 安徽唐兴装备科技股份有限公司 | Automatic replacement device for soil pressure sensor of pipe jacking machine |
| CN113216983B (en) * | 2021-05-28 | 2022-11-15 | 安徽唐兴装备科技股份有限公司 | Device for replacing soil pressure sensor of pipe jacking machine |
| CN114922633B (en) * | 2022-05-25 | 2023-07-25 | 中建交通建设集团有限公司 | Soil pressure detection device for shield tunneling machine and application method of soil pressure detection device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3458343B2 (en) * | 1995-09-04 | 2003-10-20 | ミネベア株式会社 | Earth pressure gauge |
| JPH11200784A (en) * | 1998-01-14 | 1999-07-27 | Komatsu Ltd | Protective structure of earth pressure cell |
| CN201539258U (en) * | 2009-06-03 | 2010-08-04 | 北京华隧通掘进装备有限公司 | Soil pressure sensor mounting seat for shield machine |
| CN102587925B (en) * | 2012-03-15 | 2013-06-12 | 中交天和机械设备制造有限公司 | Shielding earth pressure gage replacing device |
| CN103061772B (en) * | 2013-01-07 | 2015-04-01 | 上海隧道工程股份有限公司 | Safe replacement device for soil pressure sensor |
| CN204666285U (en) * | 2015-06-14 | 2015-09-23 | 中铁二十局集团西安工程机械有限公司 | A kind of soil pressure case mounting structure of balancing earth-pressure shielding machine |
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2018
- 2018-02-14 CN CN201810151394.9A patent/CN108331586B/en active Active
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Effective date of registration: 20211215 Address after: No. 1099, No. 5, Wan Ping Nan Road, Xuhui District, Shanghai Patentee after: SHANGHAI TUNNEL ENGINEERING Co.,Ltd. Patentee after: Shanghai Waigaoqiao tunnel machinery Co.,Ltd. Address before: No. 1099, No. 5, Wan Ping Nan Road, Xuhui District, Shanghai Patentee before: SHANGHAI TUNNEL ENGINEERING Co.,Ltd. |
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Address after: No. 1099, No. 5, Wan Ping Nan Road, Xuhui District, Shanghai Patentee after: SHANGHAI TUNNEL ENGINEERING Co.,Ltd. Patentee after: Shanghai urban construction tunnel equipment Co., Ltd Address before: No. 1099, No. 5, Wan Ping Nan Road, Xuhui District, Shanghai Patentee before: SHANGHAI TUNNEL ENGINEERING Co.,Ltd. Patentee before: Shanghai Waigaoqiao tunnel machinery Co., Ltd |