CN211524824U - Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction - Google Patents
Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction Download PDFInfo
- Publication number
- CN211524824U CN211524824U CN201922496596.XU CN201922496596U CN211524824U CN 211524824 U CN211524824 U CN 211524824U CN 201922496596 U CN201922496596 U CN 201922496596U CN 211524824 U CN211524824 U CN 211524824U
- Authority
- CN
- China
- Prior art keywords
- connecting plate
- propulsion
- propelling
- cam
- oil cylinder
- 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
Landscapes
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model provides a shield constructs not damaged automatic compensation arrangement of small radius operation propulsion protection section of jurisdiction, includes hydraulic pressure propulsion cylinder, props boots, section of jurisdiction, still includes connecting plate, propulsion board, support cylinder and cam, and the connecting plate with prop the boots and be connected, the propulsion board contacts with the terminal surface of section of jurisdiction, and support cylinder installs on the propulsion board, and the cam passes through drive arrangement and installs on the connecting plate, still can set up connecting device between connecting plate, the propulsion board. The utility model discloses a set up connecting plate, propulsion board, support cylinder and cam structure between hydraulic pressure propulsion cylinder and section of jurisdiction terminal surface, when making sharp propulsion and turn propulsion operation, the propulsion board homoenergetic and section of jurisdiction terminal surface full contact, and also be full contact all the time between hydraulic pressure propulsion cylinder and the connecting plate, angle modulation during the turn relies on the cooperation between support cylinder and the cam, has protected hydraulic pressure propulsion cylinder and section of jurisdiction not receive the damage, and the connecting plate can be dismantled with the propulsion board, and it is convenient to maintain.
Description
Technical Field
The utility model relates to an engineering construction equipment technical field especially relates to a shield constructs small radius operation propulsion protection section of jurisdiction not damaged automatic compensation arrangement.
Background
The shield segment is an important component in shield construction and tunnel support, and is simultaneously assembled into a ring along with the propulsion of a shield machine, so that on one hand, the shield segment provides main support for the tunnel, plays a role in supporting and resisting soil layer pressure, underground water pressure, other loads and water resistance, and forms a complete formed tunnel; on the other hand, a supporting force is provided for the propelling of the shield tunneling machine in the shield construction process, and a piston rod of a propelling oil cylinder of the shield tunneling machine pushes against the end face of the assembled last ring segment to push the segment to advance. Most of currently used thrust cylinders are rigid supports, when a shield tunneling machine is linearly propelled, piston rods of the hydraulic cylinders are in overall contact with the end faces of pipe pieces, the contact area is large, the end faces of the concrete pipe pieces comprehensively receive friction force from a cutting soil layer of the shield tunneling machine and reaction force for forward propulsion, the pipe pieces bear water and soil pressure of cutter heads, thrust force of upper soil body friction force is overcome, surrounding rock friction thrust force is overcome, soil (rock) cutting force required by excavation is overcome, rear matched traction thrust force is achieved, and the sum of all thrust force is about 2000 tons. When the shield machine is in curve turning operation, the axis direction of the segment is gradually separated from the axis of the hydraulic oil cylinder to form an included angle, so that the hydraulic oil cylinder is in local contact with the end face of the segment, and particularly when the shield machine is in small-radius turning, the contact area is reduced sharply, and the local pressure is increased sharply. The risk that the segment is damaged due to huge pressure is generated when the straight shield of the shield machine is pushed, the probability of damage is increased when the curve is pushed, and therefore the problem that the pressure is increased sharply due to the reduction of the contact area when the shield machine turns is necessary to be researched and solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide a but shield that automatic angle of adjustment made hydraulic cylinder and section of jurisdiction terminal surface full contact constructs operation section of jurisdiction not damaged automatic compensation arrangement.
The utility model discloses a realize through following technical scheme:
a shield small-radius operation propelling protection duct piece nondestructive automatic compensation device comprises a hydraulic propelling oil cylinder, a supporting shoe, a duct piece, a connecting plate, a propelling plate, a supporting oil cylinder and a cam, wherein the supporting shoe is connected with a piston rod of the hydraulic propelling oil cylinder, the connecting plate is connected with the supporting shoe, and the propelling plate is in contact with the end face of the duct piece and is opposite to the connecting plate; the supporting oil cylinder is arranged on the pushing plate and is used for being in contact with the connecting plate to support the supporting shoe; the cam is installed on the connecting plate, and the axis of the cam is horizontally arranged and is perpendicular to the axis of the hydraulic propulsion oil cylinder, and is used for being in contact with the connecting plate to support the supporting shoe during turning. When the shield tunneling machine is linearly propelled, the propelling plate is propped against the end face of the duct piece and is in full contact with the end face of the duct piece, a piston rod of the supporting oil cylinder is perpendicular to the propelling plate, a piston rod of the supporting oil cylinder is in perpendicular contact with the connecting plate, the hydraulic propelling oil cylinder is indirectly propped against the end face of the duct piece to drive the shield tunneling machine to advance, and at the moment, the cam is not in contact with the propelling plate and is in an idle state; when the shield machine turns, the piston rod of the supporting oil cylinder is adjusted, and meanwhile, the driving cam is driven to rotate to be in contact with the pushing plate and push the pushing plate to be in contact with the end face of the duct piece, so that the pushing plate can be guaranteed to be in full contact with the end face of the duct piece all the time to guarantee that the end face is not damaged due to overlarge local pressure.
Further, still be provided with connecting device between connecting plate, the propulsion board, connecting device includes telescopic link, sleeve and reset spring, the sleeve is fixed on the propulsion board, telescopic link one end articulates on the connecting plate, another pot head is established can follow the sleeve and slide in the sleeve, reset spring sets up the telescopic link with between the sleeve. When the shield tunneling machine needs to turn, the connecting plate rotates relative to the telescopic rod and the pushing plate, and the telescopic rod slides along the sleeve to offset the micro displacement generated by rotation; when the shield tunneling machine is converted into linear propulsion, the reset spring enables the connecting plate and the propulsion plate to reset.
Further, the two cams are installed on the connecting plate in parallel. Set up two cams, on the one hand can increase area of contact, make pressure dispersion, on the other hand when the section of jurisdiction is located the side of turning point relatively, the accessible is adjusted two cams and is carried out angle modulation so that propulsion plate and section of jurisdiction terminal surface full contact with the contact point of propulsion plate.
Furthermore, each cam is connected with an independent driving mechanism, each driving mechanism comprises a driving oil cylinder, a rack, a gear and a support frame, the rack is slidably connected to the connecting plate, the driving oil cylinder is connected with the rack to drive the rack to move, and the rack is in meshing transmission connection with the gear; the support frame fixed connection be in on the connecting plate, the pivot of gear passes through bearing rotatable coupling and is in on the support frame, the pivot of gear simultaneously with the pivot fixed connection of cam. The driving oil cylinder drives the rack to slide, and the rack driving gear rotates to drive the cam to rotate the utility model discloses in, the cam only needs to rotate the angle of little angle in order to adjust the propulsion plate, simultaneously with supporting oil cylinder together play certain supporting role.
Further, be connected with the carriage on the connecting plate, be provided with the spout on the carriage, be provided with the draw runner on the rack, the rack passes through but the cooperation sliding connection of draw runner and spout is in on the carriage.
Further, still include hydraulic control system, hydraulic control system includes computer programming controller, oil tank, high-pressure oil pump, oil pipeline, oil return line, high-pressure oil pump is connected with the oil tank, oil pipeline and high-pressure oil pump connection, computer programming controller respectively with high-pressure oil pump, oil pipeline's valve, oil return line's valve electricity are connected, oil pipeline respectively with support cylinder and actuating cylinder connect. The computer programmable controlled hydraulic system can determine relevant parameters according to the shield drawing (radius, horizontal curve, vertical curve, hollow angle and elevation angle) of the tunnel, and implement computer programming, and when the shield machine digs into any position in the tunnel, the relevant internal and external deviation elements on each hydraulic oil cylinder can be calculated in advance to be deduced and implemented, and the adjustment and compensation are carried out when the shield machine digs, so that the tunnel segment is protected from being damaged. When turning, according to the direction and angle of turning required, the control cam rotates to contact with the pushing plate and further push the pushing plate to be in full contact with the end face of the segment.
As a further supplement, the propulsion plate and the contact of the end face of the segment can be provided with a sensor on the surface, the sensor is connected with the hydraulic control system for sensing whether the propulsion plate is in full contact with the end face of the segment. The sensor is an infrared sensor.
The utility model discloses a set up connecting plate, propulsion board, support cylinder and cam structure between hydraulic pressure propulsion cylinder and section of jurisdiction terminal surface, when making straight line propulsion and turn propulsion operation, the propulsion board homoenergetic with the section of jurisdiction terminal surface full contact, and also be full contact all the time between hydraulic pressure propulsion cylinder and the connecting plate, angle modulation during turning relies on the cooperation between support cylinder and the cam, has protected hydraulic pressure propulsion cylinder and section of jurisdiction not receive the damage, and connecting plate and propulsion board can be dismantled, it is convenient to maintain; the dual adjusting structure of the two cams and the two supporting oil cylinders is convenient for angle adjustment and is also beneficial to pressure dispersion; a connecting device is arranged between the connecting plate and the pushing plate, so that operation switching is facilitated, and the control system can realize automatic control.
Drawings
Fig. 1 is an installation schematic diagram of the embodiment of the present invention and a segment end surface.
Fig. 2 is a schematic structural diagram of a segment at a position in fig. 1 according to an embodiment of the present invention.
Fig. 3 is a schematic view of the structure of the bending operation in fig. 2.
Fig. 4 is a schematic structural diagram of a connection device according to an embodiment of the present invention.
Fig. 5 is a schematic view of an installation structure of a cam driving mechanism in an embodiment of the present invention.
Fig. 6 is an enlarged schematic view of the structure of the cam driving mechanism in the embodiment of the present invention.
Fig. 7 is another schematic view of the embodiment of the present invention and another installation of the end face of the duct piece.
Fig. 8 is a schematic structural diagram of the duct piece at B in fig. 7 according to the embodiment of the present invention.
Reference numerals: 1-hydraulic propulsion oil cylinder; 2-supporting the boot; 3-a pipe piece; 4-connecting plates; 5-a pushing plate; 6-supporting the oil cylinder; 7-a cam; 8-a connecting device; 9-a drive mechanism; 91-gear; 92-a rack; 93-driving oil cylinder; 94-a carriage; 95-a support frame; 81-telescopic rod; 82-a sleeve; 83-return spring.
Detailed Description
During shield structure operation, assemble the section of jurisdiction of completion as shown in figure 1 or figure 7, the utility model discloses a shield structure operation section of jurisdiction not damaged automatic compensation arrangement contacts with the terminal surface of single section of jurisdiction. A shield small-radius operation propelling protection segment nondestructive automatic compensation device comprises a hydraulic propelling oil cylinder 1, a supporting shoe 2 and a segment 3, and further comprises a connecting plate 4, a propelling plate 5, a supporting oil cylinder 6 and a cam 7, wherein the supporting shoe 2 is connected with a piston rod of the hydraulic propelling oil cylinder 1, the connecting plate 4 is connected with the supporting shoe 2, and the propelling plate 5 is in contact with the end face of the segment 3 and is opposite to the connecting plate 4; the supporting oil cylinder 6 is arranged on the pushing plate 5 and is used for contacting with the connecting plate 4 to support the supporting shoe 2; the cam 7 is installed on the connecting plate 4, the axis of the cam 7 is horizontally arranged and is perpendicular to the axis of the hydraulic propulsion oil cylinder 1, and the cam 7 is used for being in contact with the connecting plate 4 to support the supporting shoe 2 during turning.
As shown in fig. 2, when the shield tunneling machine is linearly propelled, the propelling plate 5 is pushed against the end surface of the segment 3 and is in full contact with the end surface of the segment 3, the piston rod of the supporting oil cylinder 6 is perpendicular to the propelling plate 5, the piston rod of the supporting oil cylinder 6 is in perpendicular contact with the connecting plate 4, and the hydraulic propelling oil cylinder 1 indirectly pushes against the end surface of the segment 3 to drive the shield tunneling machine to advance. At this time, the cam 7 may be in an idle state without contacting the thrust plate 5, or may contact the thrust plate 5 to support the thrust plate together with the support cylinder 6.
As shown in figure 3, when the shield machine turns, the piston rod of the support oil cylinder 6 is adjusted, and the driving cam 7 rotates to contact with the pushing plate 5 and push the pushing plate to contact with the end face of the duct piece 3, so that the pushing plate can be ensured to be in full contact with the end face of the duct piece 3 all the time to ensure that the end face is not damaged due to overlarge local pressure.
As shown in fig. 4, a connecting device 8 is further disposed between the connecting plate 4 and the pushing plate 5, the connecting device 8 includes a telescopic rod 81, a sleeve 82 and a return spring 83, the sleeve 82 is fixed on the pushing plate 5, one end of the telescopic rod 81 is hinged to the connecting plate 4, the other end of the telescopic rod is sleeved in the sleeve 82 and can slide along the sleeve 82, and the return spring 83 is disposed between the telescopic rod 81 and the sleeve 82. When the shield tunneling machine needs to turn, the connecting plate 4 rotates relative to the telescopic rod 81 and the pushing plate 5, and the telescopic rod slides along the sleeve 82 to offset the micro displacement generated by rotation; when the shield tunneling machine is converted into the linear propulsion, the return spring 83 returns the connecting plate 4 and the propulsion plate 5.
The two cams 7 are arranged on the connecting plate 4 in parallel, the installation positions of the cams depend on the space configuration where the duct piece is located, for example, when the duct piece is located at the top, the two cams are arranged on the same horizontal plane in parallel, and when the duct piece is located at the side, the two cams are arranged in parallel up and down. Two cams 7 are arranged, so that the contact area can be increased, the pressure can be dispersed, and when the duct piece 3 is relatively positioned on the side surface of a turning point, as shown in fig. 3, the angle can be adjusted by adjusting the contact points of the two cams 7 and the pushing plate 5, so that the pushing plate 5 is in full contact with the end surface of the duct piece 3.
As shown in fig. 5 and 8, each of the cams is connected to an independent driving mechanism 9, as shown in fig. 5 and 6, the driving mechanism 9 includes a driving cylinder 93, a rack 92, a gear 91, a supporting frame 95 and a sliding frame 94, the supporting frame 95 and the sliding frame 94 are both fixedly connected to the connecting plate 4, a sliding groove is formed in the sliding frame 94, a sliding strip is arranged on the rack 92, and the rack 92 is slidably connected to the sliding frame 94 through the matching of the sliding strip and the sliding groove. The driving oil cylinder 93 is connected with the rack 92 to drive the rack 92 to move, and the rack 92 is in meshed transmission connection with the gear 91; the rotating shaft of the gear 91 is rotatably connected to the supporting frame 95 through a bearing, and the rotating shaft of the gear 91 is fixedly connected with the rotating shaft of the cam 7. The actuating cylinder 93 drives the rack 92 to slide, and the rack 92 drives the gear 91 to rotate to drive the cam 7 to rotate the utility model discloses in, the cam 7 only needs to rotate the angle of little angle in order to adjust the propulsion plate, simultaneously with support cylinder 6 together play certain supporting role.
This embodiment still includes hydraulic control system, hydraulic control system includes computer programming controller, oil tank, high-pressure oil pump, oil pipeline, oil return line, high-pressure oil pump is connected with the oil tank, oil pipeline is connected with high-pressure oil pump, computer programming controller respectively with high-pressure oil pump, oil pipeline's valve, oil return line's valve electricity are connected, oil pipeline respectively with support cylinder and actuating cylinder 93 are connected. The computer programmable controlled hydraulic system can determine relevant parameters according to the drawing (radius, horizontal curve, vertical curve, depression angle and elevation angle) of the tunnel shield, and implement computer programming, and when the shield machine digs into any position in the tunnel, the relevant internal and external deviation elements on each hydraulic oil cylinder can be calculated in advance to be deduced and implemented, and the adjustment and compensation are carried out when the shield machine digs, so that the tunnel segment is protected from being damaged. When turning, according to the direction and the angle that need turn, the flexible volume of control support cylinder 6 piston rod comes the angle of adjustment, and control cam 7 rotates simultaneously and in order to contact with propulsion board 5 and further promote propulsion board 5 and the full contact of section of jurisdiction 3 terminal surface.
As one embodiment, a plurality of sensors may be further disposed on the surface of the propulsion plate 5 contacting the end face of the segment 3, and the sensors are connected to the control system for sensing whether the propulsion plate 5 is in full contact with the end face of the segment 3. The sensor is an infrared sensor.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.
Claims (6)
1. A shield small-radius operation propelling protection segment nondestructive automatic compensation device comprises a hydraulic propelling oil cylinder, a supporting shoe and a segment, and is characterized by further comprising a connecting plate, a propelling plate, a supporting oil cylinder and a cam, wherein the supporting shoe is connected with a piston rod of the hydraulic propelling oil cylinder, the connecting plate is connected with the supporting shoe, and the propelling plate is in contact with the end face of the segment and is opposite to the connecting plate; the supporting oil cylinder is arranged on the pushing plate and is used for being in contact with the connecting plate to support the supporting shoe; the cam is installed on the connecting plate, and the axis of the cam is horizontally arranged and is perpendicular to the axis of the hydraulic propulsion oil cylinder, and is used for being in contact with the connecting plate to support the supporting shoe during turning.
2. The non-damage automatic compensation device for the shield small-radius operation propelling protection segment according to claim 1, wherein a connecting device is further arranged between the connecting plate and the propelling plate, the connecting device comprises a telescopic rod, a sleeve and a return spring, the sleeve is fixed on the propelling plate, one end of the telescopic rod is hinged to the connecting plate, the other end of the telescopic rod is sleeved in the sleeve and can slide along the sleeve, and the return spring is arranged between the telescopic rod and the sleeve.
3. The apparatus according to claim 2, wherein two cams are mounted on the connecting plate in parallel to each other.
4. The device for automatically compensating the damage-free advanced protective segment for the shield small-radius operation according to claim 2 or 3, wherein each cam is connected with an independent driving mechanism, each driving mechanism comprises a driving oil cylinder, a rack, a gear and a support frame, the rack is slidably connected onto the connecting plate, the driving oil cylinder is connected with the rack to drive the rack to move, and the rack is in meshing transmission connection with the gear; the support frame fixed connection be in on the connecting plate, the pivot of gear passes through bearing rotatable coupling and is in on the support frame, the pivot of gear simultaneously with the pivot fixed connection of cam.
5. The nondestructive automatic compensation device for the shield small-radius operation propelling protective segment as recited in claim 4, wherein a sliding frame is connected to the connecting plate, a sliding groove is formed in the sliding frame, a sliding strip is arranged on the rack, and the rack is slidably connected to the sliding frame through the matching of the sliding strip and the sliding groove.
6. The non-damage automatic compensation device for the shield small-radius operation propelling protection segment according to claim 4, and is characterized by further comprising a hydraulic control system, wherein the hydraulic control system comprises a computer programming controller, an oil tank, a high-pressure oil pump, an oil conveying pipeline and an oil return pipeline, the high-pressure oil pump is connected with the oil tank, the oil conveying pipeline is connected with the high-pressure oil pump, the computer programming controller is respectively electrically connected with the high-pressure oil pump, a valve of the oil conveying pipeline and a valve of the oil return pipeline, and the oil conveying pipeline is respectively connected with the supporting oil cylinder and the driving oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922496596.XU CN211524824U (en) | 2019-12-31 | 2019-12-31 | Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922496596.XU CN211524824U (en) | 2019-12-31 | 2019-12-31 | Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211524824U true CN211524824U (en) | 2020-09-18 |
Family
ID=72468382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922496596.XU Active CN211524824U (en) | 2019-12-31 | 2019-12-31 | Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211524824U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780290A (en) * | 2021-01-07 | 2021-05-11 | 河北机电职业技术学院 | Hydraulic propelling structure of shield tunneling machine |
| CN113513332A (en) * | 2021-05-10 | 2021-10-19 | 机械科学研究总院青岛分院有限公司 | Gear transmission type duct piece clamping device for shield machine |
| CN113606205A (en) * | 2021-08-04 | 2021-11-05 | 盾构及掘进技术国家重点实验室 | TBM props boots device based on distributing type initiative plunger |
-
2019
- 2019-12-31 CN CN201922496596.XU patent/CN211524824U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780290A (en) * | 2021-01-07 | 2021-05-11 | 河北机电职业技术学院 | Hydraulic propelling structure of shield tunneling machine |
| CN113513332A (en) * | 2021-05-10 | 2021-10-19 | 机械科学研究总院青岛分院有限公司 | Gear transmission type duct piece clamping device for shield machine |
| CN113513332B (en) * | 2021-05-10 | 2023-08-25 | 机械科学研究总院青岛分院有限公司 | Gear transmission type segment clamping device for shield machine |
| CN113606205A (en) * | 2021-08-04 | 2021-11-05 | 盾构及掘进技术国家重点实验室 | TBM props boots device based on distributing type initiative plunger |
| CN113606205B (en) * | 2021-08-04 | 2023-09-15 | 盾构及掘进技术国家重点实验室 | TBM props boots device based on distributed initiative plunger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211524824U (en) | Shield constructs not damaged automatic compensation arrangement of small diameter operation propulsion protection section of jurisdiction | |
| CN201090229Y (en) | Engine-carried type supporting machine | |
| CN215057495U (en) | Three-station push beam and anchoring device thereof | |
| CN111706370A (en) | Hydraulic anchor rod drill carriage and three-station push beam thereof | |
| CN104033168A (en) | Self-moving flat-bed drilling anchor vehicle | |
| CN206662012U (en) | Hydraulic pipe bender | |
| CN209510238U (en) | A kind of lane Di Chou drill carriage | |
| CN213540403U (en) | Angle adjusting device for push bench | |
| CN210264700U (en) | TBM advancing mechanism structure and device | |
| EP2715068B1 (en) | Tunneling apparatus | |
| CN207526516U (en) | A kind of removable alley hydraulic support | |
| NO170559B (en) | ANTENNA MASTER SWITCH | |
| CN203383731U (en) | Push pointing type rotary guide well drilling device | |
| CN210829278U (en) | Segment propulsion device of shield machine | |
| CN102322268A (en) | Protecting device of shield machine thrust oil cylinder | |
| CN202970431U (en) | Drilling mechanism for mine rock drilling tunneling | |
| CN203961786U (en) | The mining one rig of a kind of super narrow moulded coal | |
| CN208587180U (en) | Adapt to a variety of coal winning technology hydraulic supports | |
| CN204038581U (en) | Novel tube pulling unit | |
| CN201381868Y (en) | Hydraulic support telescopic top beam with face guard mechanism | |
| CN212958688U (en) | Hydraulic anchor rod drill carriage and three-station push beam thereof | |
| CN201891424U (en) | Hydraulic support with support adjusting jack | |
| CN212958689U (en) | Hydraulic anchor rod drill carriage and three-station push beam and rotary switching device thereof | |
| CN202228081U (en) | Propelling cylinder protection device for shield machine | |
| CN209892102U (en) | Drilling vehicle for pipeline installation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |