CN210152654U - Diameter-variable rectangular pipe jacking machine shield - Google Patents
Diameter-variable rectangular pipe jacking machine shield Download PDFInfo
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- CN210152654U CN210152654U CN201920892535.2U CN201920892535U CN210152654U CN 210152654 U CN210152654 U CN 210152654U CN 201920892535 U CN201920892535 U CN 201920892535U CN 210152654 U CN210152654 U CN 210152654U
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Abstract
The utility model relates to a push bench technical field especially relates to a rectangle push bench shield body of variable footpath, the utility model discloses a rectangle push bench shield body of variable footpath adopts the modularized design, and every individual shield body basic module all contains independent drive mechanism mount pad, motor mount pad and the hydro-cylinder structure of rectifying. The shield body basic modules are divided into peripheral shield body basic modules and middle shield body basic modules, and the rectangular pipe jacking machine with the required size can be combined through module connection. Adopt high strength bolted connection between module and the module, set up whole circle sealing washer on connecting the face, the effectual tunnel of having avoided excavating other cross sectional dimensions then need redesign customization a new rectangle pipe pushing jack shield body and lead to new equipment customization cycle length, and the expense is expensive to the extension that has caused construction cycle and the problem that construction cost improves.
Description
Technical Field
The utility model relates to a push bench technical field especially relates to a rectangle push bench shield body of variable footpath.
Background
At present, the pipe jacking machine technology becomes a main construction method for constructing urban tunnels of underground railways, telecommunications, electric power, water and sewer pipelines and the like. However, the size of the cross section of the rectangular tunnel is lack of mandatory specifications at present, the size of the cross section of the tunnel with various requirements is large, and the rectangular pipe jacking machine which is not variable in diameter and has a single size can only excavate the tunnel with a fixed size. The rectangular push bench with fixed size can not excavate tunnels with other section sizes after excavating a tunnel with a certain section size, so that equipment is idle and resources are wasted. If tunnels with other section sizes need to be excavated, a new rectangular push bench shield body needs to be redesigned and customized. However, the new equipment has long customization period and high cost, thereby prolonging the construction period and increasing the construction cost.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a rectangle push bench shield body of diameter-variable, the accessible the utility model discloses be under construction to different interface size's tunnel, need customize the customization cycle length that a new rectangle push bench shield body caused again when the effectual tunnel of avoiding other cross sectional dimension of excavation that mentions among the prior art, problem that construction cost is high.
The technical scheme of the utility model as follows:
a variable-diameter rectangular pipe jacking machine modular cutter head comprises a complete rectangular cutter head base formed by combining at least two pairs of independent rectangular cutter head base modules, so that the variable-diameter rectangular pipe jacking machine modular cutter head base can realize variable diameter in four directions including the upper direction, the lower direction, the left direction and the right direction of a tunnel, two cutter head mounting holes are formed in each independent rectangular cutter head base module, a rear end shaft of a single connecting rod crankshaft driving a cutter head to rotate extends into each of the two cutter head mounting holes, a front end shaft of the single connecting rod crankshaft is mounted on a speed reducer, the speed reducer is mounted with a motor rotating shaft, so that power can be transmitted to the speed reducer through a motor, and then the power is transmitted to the single connecting rod crankshaft through the speed reducer so as to drive; the rear end shaft of the single connecting rod crankshaft is sleeved with a layer of shell, the shell is fixedly installed on the cutter head base module, the rear end shaft of the single connecting rod crankshaft is sleeved with a roller bearing, and the roller bearing is fixed inside the shell sleeved with the rear end shaft.
Furthermore, a thrust bearing is sleeved at one end, far away from the cutter head base module, of the rear end shaft of the single-connecting-rod crankshaft, and the thrust bearing is fixed inside a shell sleeved on the periphery of the rear end shaft.
The front end shafts of the two single-connecting-rod crankshafts respectively inserted into the two cutter head mounting holes of the same cutter head base module penetrate through the same mounting sleeve, two through holes for the front end shafts to penetrate are formed in the mounting sleeve, and the roller bearings are mounted in the through holes and sleeved on the front end shafts.
The single-connecting-rod crankshaft is characterized in that a layer of shell is sleeved on a front end shaft of the single-connecting-rod crankshaft, the shell sleeved on the front end shaft is fixedly installed on the installation sleeve, and a spacer ring, a thrust bearing and a roller bearing are sequentially sleeved from one end, close to the installation sleeve, of the front end shaft to one end, far away from the installation sleeve, of the front end shaft. The roller bearing installed in the through hole of the installation sleeve is separated from the thrust bearing sleeved on the front end shaft through the spacer ring.
Furthermore, for the purpose of facilitating processing and facilitating disassembly and assembly, an end cover is sleeved on the front end shaft, the end cover is connected with the shell of the front end shaft through a bolt, the end cover is close to one end, away from the mounting sleeve, of the roller bearing sleeved on the front end shaft, the inner diameter of the end cover is larger than that of the front end shaft and is smaller than the outer diameter of the roller bearing, the roller bearing is effectively prevented from displacing along the length direction of the front end shaft on the front end shaft, and an oil filling hole is formed in the end cover.
Still further, a speed reducer connecting sleeve is further installed at one end, far away from the installation sleeve, of the end cover, and the speed reducer connecting sleeve is installed on a shell of the speed reducer through a bolt.
Preferably, the utility model discloses a four make up side by side into complete rectangle blade disc base to solitary rectangle blade disc base module.
Further, be convenient for the utility model discloses an integrated device is more firm the welding has connecting spoke between every blade disc base module.
Preferably, three connecting spokes are welded between every two adjacent cutter head base modules and are respectively positioned at two ends and the middle position between every two adjacent cutter head base modules.
In order to facilitate the utility model provides a but the rectangle push bench modularization cutter head of reducing transports to the shield construction field, consequently the utility model also provides a but the rectangle push bench shield body of reducing.
A variable-diameter rectangular pipe jacking machine shield comprises a complete shield body structure formed by combining at least two pairs of shield body basic modules, so that the variable diameter in the upper, lower, left and right directions based on a tunnel can be realized by adjusting the mounting clearance between the shield body basic modules, the shield body basic modules are divided into peripheral shield body basic modules and middle shield body basic modules, the peripheral shield body basic modules comprise two shield body basic panels which are vertically mounted with each other, and the middle shield body basic modules comprise one shield body basic panel; one end that shield body foundation module is close to the blade disc is provided with the drive mechanism mounting panel of installing perpendicularly in shield body foundation panel, the lead has the through-hole that is used for installing the installation cover on the drive mechanism mounting panel to be provided with the mount pad that is used for installing the motor in the position department that shield body foundation module is close to shield body foundation module middle part, and the one end of keeping away from the blade disc at shield body foundation module is provided with the hydro-cylinder mounting panel of rectifying, it has two through-holes to be used for the installation hydro-cylinder of rectifying to lead on the hydro-cylinder mounting panel, the one end that shield body foundation module kept away from the blade disc has.
Further, all be provided with the semicircle arc surface of indent and the quarter arc surface of indent on the face that the drive mechanism mounting panel of peripheral shield body basic module and the drive mechanism mounting panel of another shield body basic module contacted for play two shield body basic module combination its semicircle arc surfaces of two indents and form a complete manhole, four shield body basic module assemble back four quarter arc surfaces and form a complete screw machine hole, and make the manhole be located the central horizontal line of shield body height after assembling the completion, its screw machine hole is located the one end near ground.
Furthermore, a plurality of reinforcing rib plates are arranged between the transmission mechanism mounting plate and the mounting seat for mounting the motor, and a plurality of reinforcing rib plates are also arranged between the mounting seat for mounting the motor and the deviation-correcting oil cylinder mounting plate.
Preferably, the shield body base modules are connected with each other through bolts, and the shield body base modules are connected with each other through bolts.
Furthermore, sealing rings are arranged on the contact surfaces of the connecting plates, which are in contact with each other, of the two adjacent shield body base modules.
Still further, after guaranteeing the reducing the utility model discloses a rectangle push bench shield body of variable diameter under the degree of stability, still include the reducing module, the reducing module sets up between two adjacent shield body basic module to be provided with two connecting plates respectively with pass through bolted connection between the connecting plate of the adjacent shield body basic module in reducing module both ends, and be provided with the sealing washer on its connection face.
Still further, a reinforcing rib plate is arranged between the two connecting plates of the reducing module.
And furthermore, a shovel blade is arranged at one end, close to the excavation surface, of the complete shield body structure along the periphery of the shield body.
Preferably, the utility model is a complete shield structure formed by combining four pairs of shield basic modules,
the utility model has the advantages that: the utility model divides the cutter head base into a plurality of modules, thereby the diameter of the cutter head can be expanded through the combined clearance between the modules, the cutter head is arranged on the transmission mechanism through the cutter head mounting hole arranged on the cutter head base module, thereby the diameter-variable excavation of the cutter head is realized, thereby the diameter-variable tunnel push bench of the utility model can realize the diameter-variable excavation under a certain diameter-expanding size, the problems of long construction period and high construction cost caused by the need of manufacturing the cutter head again when tunnels with other sizes are excavated are avoided, and the utility model also provides a diameter-variable rectangular push bench shield body which is matched with a diameter-variable rectangular push bench modular cutter head, so that the diameter-variable cutter head can be directly assembled to the diameter-variable rectangular push bench shield body to be used, thereby avoiding the problem that the diameter-variable excavation can not be realized by the prior art, when tunnels with different sizes are excavated, a rectangular push bench matched with the tunnel size needs to be manufactured again, so that the problems of high construction cost and long construction period are caused.
Drawings
Fig. 1 is a schematic view of the installation relationship between a single cutter head base module and a drive according to the present invention;
fig. 2 is a schematic view of the internal structure of the driving device of the present invention;
FIG. 3 is a schematic view of the complete cutter head base of the present invention;
fig. 4 is a schematic view of the complete cutterhead base after diameter expansion according to the present invention;
FIG. 5 is a schematic view of the internal structure of the push bench of the present invention;
FIG. 6 is a schematic diagram of a peripheral shield foundation module of the present invention;
FIG. 7 is a schematic view of a basic module of the intermediate shield of the present invention;
fig. 8 is a schematic view of a diameter-changing module of the present invention;
FIG. 9 is a schematic view of the complete shield of the present invention;
FIG. 10 is a schematic view of the expanded shield of the present invention;
description of reference numerals: 101. a cutter head base module 101; 102. a single link crankshaft; 103. installing a sleeve; 104. a speed reducer; 105. an electric motor; 106. a rear end shaft; 107. a housing; 108. a roller bearing; 109. a thrust bearing; 110. a front end shaft; 111. a spacer ring; 112. a speed reducer connecting sleeve; 113. an end cap; 114. connecting spokes; 201. a peripheral shield foundation module; 202. a connecting plate; 203. a deviation rectifying oil cylinder; 204. a hinge ring mounting surface; 205. a screw machine hole; 206. a deviation rectifying oil cylinder mounting plate; 207. a mounting seat; 208. reinforcing rib plates; 209. a concave semi-circular arc surface; 210. an inward-concave quarter arc surface; 211. a shield body base panel; 212. a diameter-changing module; 213. a middle shield foundation module; 214. a manhole; 215. a transmission mechanism mounting plate; 216. a scraper knife.
Detailed Description
The invention is further described with reference to the accompanying drawings.
The diameter-variable rectangular pipe push bench modular cutter of the invention is described in detail with reference to the attached drawings 1 to 4, and comprises a complete rectangular cutter base formed by combining at least two pairs of independent rectangular cutter base modules 101, so that the diameter can be changed in four directions of the tunnel, each single rectangular cutter head base module 101 is provided with two cutter head mounting holes, the rear end shaft 106 of the single-connecting-rod crankshaft 102 for driving the cutter head to rotate extends into each cutter head mounting hole, the front end shaft 110 of the single-connecting-rod crankshaft 102 is arranged on the speed reducer 104, the speed reducer 104 is arranged with a rotating shaft of the motor 105, so that power can be transmitted to the speed reducer 104 through the motor 105, and then the power is transmitted to the single-connecting-rod crankshaft 102 through the speed reducer 104, so as to drive the cutter head to rotate; a layer of shell 107 is sleeved on a rear end shaft 106 of the single-connecting-rod crankshaft 102, the shell 107 is fixedly installed on the cutter head base module 101, a roller bearing 108 is sleeved on the rear end shaft 106 of the single-connecting-rod crankshaft 102, and the roller bearing 108 is fixed inside the shell 107 sleeved on the rear end shaft 106.
Furthermore, a thrust bearing 109 is sleeved on one end of the rear end shaft 106 of the single-link crankshaft 102, which is far away from the cutterhead base module 101, and the thrust bearing 109 is fixed inside a shell 107 sleeved on the periphery of the rear end shaft 106.
The front end shafts 110 of the two single-connecting-rod crankshafts 102 respectively inserted into the two cutter head mounting holes of the same cutter head base module 101 penetrate through the same mounting sleeve 103, two through holes for the front end shafts 110 to penetrate are formed in the mounting sleeve 103, and the roller bearings 108 are mounted in the through holes, so that the roller bearings 108 are sleeved on the front end shafts 110.
A layer of shell 107 is sleeved on a front end shaft 110 of the single-connecting-rod crankshaft 102, the shell 107 sleeved on the front end shaft 110 is fixedly installed on the installation sleeve 103, and a spacer ring 111, a thrust bearing 109 and a roller bearing 108 are sequentially sleeved on one end, close to the installation sleeve 103, of the front end shaft 110 to one end, far away from the installation sleeve 103. The roller bearing 108 mounted in the through hole of the mounting sleeve 103 is separated from the thrust bearing fitted on the front end shaft 110 by a spacer ring 111.
Furthermore, for the purpose of facilitating processing and dismounting, an end cover 113 is sleeved on the front end shaft 110, the end cover 113 is connected with the shell 107 of the front end shaft 110 through a bolt, the end cover 113 is close to one end, away from the mounting sleeve 103, of the roller bearing 108 sleeved on the front end shaft 110, the inner diameter of the end cover 113 is larger than the diameter of the front end shaft 110 and is smaller than the outer diameter of the roller bearing 108, displacement of the roller bearing 108 on the front end shaft 110 in the length direction of the front end shaft 110 is effectively prevented, and an oil filling hole is formed in the end cover 113.
Still further, a reducer connecting sleeve 112 is further installed at one end of the end cover 113 away from the installation sleeve 103, and the reducer connecting sleeve 112 is installed on the housing 107 of the reducer 104 through bolts.
Preferably, the utility model discloses a four make up side by side into complete rectangle blade disc base to solitary rectangle blade disc base module 101.
Further, be convenient for the utility model discloses an integrated device is more firm the welding has web spoke 114 between every blade disc base module 101.
Preferably, three connecting spokes 114 are welded between every two adjacent cutterhead base modules 101 and are respectively located at two ends and the middle position between every two adjacent cutterhead base modules 101.
The preferred embodiment of the present invention will be described in detail with reference to fig. 3.
As shown in the accompanying drawing 3, the utility model discloses a four complete rectangle blade disc bases of assembling into to solitary rectangle blade disc base module 101, it is a pair of about four height based on the tunnel when assembling to solitary rectangle blade disc base module 101, every pair rectangle blade disc base module 101 sets up side by side, be provided with two blade disc mounting holes on every rectangle blade disc base module 101 thereof, only need to reduce certain proportion or make the blade disc of the cross blade disc among the prior art or star type blade disc or other types again install alone to individual blade disc mounting hole can, clearance when assembling through adjusting each rectangle blade disc base module 101, and connect through connecting spoke 114, realize the reducing of blade disc base, thereby make the excavation diameter grow of the blade disc of installing on blade disc base module 101, thereby the reducing of blade disc has been realized.
In order to facilitate the utility model provides a but the rectangle push bench modularization cutter head of reducing transports to the shield construction field, consequently the utility model also provides a but the rectangle push bench shield body of reducing.
The diameter-variable rectangular push bench shield of the present invention is described in detail with reference to fig. 1 to 10, and the diameter-variable rectangular push bench shield includes a complete shield structure formed by combining at least two pairs of shield base modules, so that it can realize diameter variation in four directions, up, down, left and right, based on a tunnel by adjusting the installation gap between the shield base modules, the shield base modules are divided into a peripheral shield base module 201 and an intermediate shield base module 213, the peripheral shield base module 201 includes two shield base panels 211 installed perpendicular to each other, and the intermediate shield base module 213 includes one shield base panel 211; one end that shield body foundation module is close to the blade disc is provided with the drive mechanism mounting panel 215 of installing in shield body foundation panel 211 perpendicularly, the drive mechanism mounting panel 215 goes up to lead has the through-hole that is used for installing installation cover 103 to be provided with the mount pad 207 that is used for installing motor 105 in the position department that shield body foundation module is close to shield body foundation module middle part, and the one end of keeping away from the blade disc at shield body foundation module is provided with the hydro-cylinder mounting panel 206 of rectifying, lead the through-hole that is used for installing the hydro-cylinder 203 of rectifying on the hydro-cylinder mounting panel 206, the one end that the blade disc was kept away from to shield body foundation module has hinge ring installation.
Further, the surfaces of the transmission mechanism mounting plate 215 of the peripheral shield body base module 201, which are in contact with the transmission mechanism mounting plate 215 of another shield body base module, are provided with an inward concave semi-circular arc surface 209 and an inward concave quarter-circular arc surface 210, so that when two shield body base modules are combined, the two inward concave semi-circular arc surfaces 209 form a complete manhole 214, after the four shield body base modules are assembled, the four inward concave quarter-circular arc surfaces 210 form a complete screw hole 205, after the assembly, the manhole 214 is located on the central horizontal line of the height of the shield body, and the screw hole 205 is located at one end close to the ground.
Further, a plurality of reinforcing ribs 208 are provided between the transmission mounting plate 215 and the mounting seat 207 for mounting the motor 105.
Preferably, the connecting plates 202 are respectively arranged at the contact positions of two adjacent shield body base modules, and the two adjacent shield body base modules are fixed by connecting the two connecting plates 202 through bolts.
Further, sealing rings are arranged on the contact surfaces of the connecting plates 202, which are in contact with each other, of the two adjacent shield body base modules.
Still further, after guaranteeing the reducing the utility model discloses a rectangle push bench shield body of variable diameter under the degree of stability, still include reducing module 212, reducing module 212 sets up between two adjacent shield body basic module to be provided with on reducing module 212 two connecting plates 202 respectively with pass through bolted connection between the connecting plate 202 of the adjacent shield body basic module in reducing module 212 both ends, and be provided with the sealing washer on its connection face.
Still further, a reinforcing rib plate 208 is arranged between the two connecting plates 202 of the reducing module 212.
Still further, a scraper knife 216 is arranged along the periphery of the shield body at one end of the complete shield body structure close to the excavation surface.
The following describes in detail a preferred embodiment of a shield of a variable diameter rectangular push bench according to the present invention with reference to fig. 9 and 10.
The utility model discloses a four shield body basic module pieces together and become a complete rectangle push bench shield body, adopt two pairs of peripheral shield body basic module 201 and two pairs of middle shield body basic module 213 to piece together and become a complete rectangle push bench shield body, it is specific, shield body basic module is a pair of about highly based on the tunnel, and every is to setting up side by side between the shield body module to setting up between two pairs of peripheral shield body basic module 201, and it is fixed through bolted connection between every shield body basic module to formed complete rectangle push bench shield body, only need adjust the clearance between every shield body basic module during the reducing, again install reducing module 212 between two shield body basic modules, can realize the reducing of rectangle shield body.
The following description is carried out to the rectangle push bench in combination with fig. 1 to 10, and a variable diameter rectangle push bench is including installing the rectangle push bench modularization blade disc of a variable diameter on the rectangle push bench shield body of a variable diameter, will set up on the rectangle push bench modularization blade disc of a variable diameter the motor is installed on the mount pad 207 of the rectangle push bench shield body of a variable diameter, and will install set 103 erection fixation is on drive mechanism mounting panel 215, assembling each blade disc base module 101 and each shield body basic module to form a variable diameter rectangle push bench.
Claims (9)
1. A variable-diameter rectangular pipe jacking machine shield body is characterized by comprising a complete shield body structure formed by combining at least two pairs of shield body basic modules, so that the variable diameter in four directions, namely the upper direction, the lower direction, the left direction and the right direction based on a tunnel can be realized by adjusting the mounting clearance between the shield body basic modules, the shield body basic modules are divided into peripheral shield body basic modules (201) and a middle shield body basic module (213), the peripheral shield body basic modules (201) comprise two shield body basic panels (211) which are vertically mounted, and the middle shield body basic module (213) comprises one shield body basic panel (211); one end that shield body basic module is close to the blade disc is provided with drive mechanism mounting panel (215) of installing in shield body basic panel (211) perpendicularly, it has the through-hole that is used for installing installation cover (103) to lead on drive mechanism mounting panel (215), and be provided with mount pad (207) that are used for installing motor (105) in the position department that shield body basic module is close to shield body basic module middle part, and the one end of keeping away from the blade disc at shield body basic module is provided with deviation-correcting oil cylinder mounting panel (206), it has the through-hole that is used for installing deviation-correcting oil cylinder (203) to lead on deviation-correcting oil cylinder mounting panel (206), the one end reservation that the blade disc was kept away from to shield body basic module has articulated loop installation.
2. The variable-diameter rectangular push bench shield body according to claim 1, wherein the surfaces of the transmission mechanism mounting plates (215) of the peripheral shield body base modules (201) contacting with the transmission mechanism mounting plate (215) of another shield body base module are provided with an inner concave semi-circular arc surface (209) and an inner concave quarter-circular arc surface (210), so that when two shield body base modules are combined, the two inner concave semi-circular arc surfaces (209) form a complete manhole (214), the four inner concave quarter-circular arc surfaces (210) form a complete screw hole (205), after the four shield body base modules are assembled, the manhole (214) is located on the central horizontal line of the height of the shield body, and the screw hole (205) is located at one end close to the ground.
3. The shield of a variable diameter rectangular push bench according to claim 1, wherein a plurality of reinforcing ribs (208) are provided between the transmission mounting plate (215) and the mounting seat (207) for mounting the motor (105).
4. The shield of the variable-diameter rectangular pipe pushing jack of claim 1, wherein connecting plates (202) are respectively arranged at the contact positions of two adjacent shield base modules, and the two adjacent shield base modules are fixed by connecting the two connecting plates (202) through bolts.
5. The variable diameter rectangular push bench shield according to claim 4, wherein the contact surface of the connecting plate (202) where two adjacent shield base modules contact is provided with a sealing ring.
6. The shield of claim 1, wherein a scraper (216) is arranged along the perimeter of the shield at the end of the complete shield structure near the excavation face.
7. The shield of the variable diameter rectangular pipe pushing jack of claim 1, wherein four pairs of shield base modules are assembled to form a complete rectangular pipe pushing jack shield, two pairs of peripheral shield base modules (201) and two pairs of middle shield base modules (213) are assembled to form a complete rectangular pipe pushing jack shield, the shield base modules are paired up and down based on the height of the tunnel, each pair of shield base modules are arranged side by side, two pairs of middle shield base modules (213) are arranged between two pairs of peripheral shield base modules (201), and each shield base module is fixed by bolts.
8. The rectangular push bench shield body of any one of claims 1 to 7, further comprising a diameter-changing module (212), wherein the diameter-changing module (212) is disposed between two adjacent shield base modules, two connecting plates (202) disposed on the diameter-changing module (212) are respectively connected with the connecting plates (202) of the shield base modules adjacent to both ends of the diameter-changing module (212) by bolts, and sealing rings are disposed on the connecting plates.
9. The shield of the rectangular tube push bench with variable diameter according to claim 8, wherein a reinforcing rib plate (208) is arranged between two connecting plates (202) of the variable diameter module (212).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892535.2U CN210152654U (en) | 2019-06-14 | 2019-06-14 | Diameter-variable rectangular pipe jacking machine shield |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920892535.2U CN210152654U (en) | 2019-06-14 | 2019-06-14 | Diameter-variable rectangular pipe jacking machine shield |
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| CN210152654U true CN210152654U (en) | 2020-03-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173271A (en) * | 2019-06-14 | 2019-08-27 | 中铁工程服务有限公司 | A kind of rectangular pipe jacking machine shield body of reducing |
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2019
- 2019-06-14 CN CN201920892535.2U patent/CN210152654U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173271A (en) * | 2019-06-14 | 2019-08-27 | 中铁工程服务有限公司 | A kind of rectangular pipe jacking machine shield body of reducing |
| CN110173271B (en) * | 2019-06-14 | 2024-02-27 | 中铁工程服务有限公司 | Diameter-variable rectangular shield body of push bench |
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