CN112901184A - Automatic stopping device of rectangle push pipe with pawl - Google Patents
Automatic stopping device of rectangle push pipe with pawl Download PDFInfo
- Publication number
- CN112901184A CN112901184A CN202110421180.0A CN202110421180A CN112901184A CN 112901184 A CN112901184 A CN 112901184A CN 202110421180 A CN202110421180 A CN 202110421180A CN 112901184 A CN112901184 A CN 112901184A
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- Prior art keywords
- pipe joint
- pipe
- pawl
- stopping
- fixing
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- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/005—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by forcing prefabricated elements through the ground, e.g. by pushing lining from an access pit
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of underground mechanical underground excavation construction, in particular to a rectangular jacking pipe automatic stopping device with a pawl, which comprises stopping parts and fixing parts, wherein the stopping parts are horizontally and symmetrically arranged on two sides of a pipe joint along the length direction of the pipe joint and used for fixing the pipe joint; the stopping component comprises a working support and a pawl, and a reserved groove matched with the pawl is formed in the surface of the pipe joint; the fixing part is used for fixing the retaining part and providing counter force for preventing the push bench and the pipe joint from returning, and comprises a fixing support, a fixing bolt, a spring and a spring fixing device; the stopping device realizes the technology of pipe pushing jack and pipe joint stopping under the cooperation of devices such as stopping part, fixed part at the in-process that pipe pushing jack and pipe joint constantly pushed forward, compares with traditional stopping measure, the device simple structure, and degree of automation is high, consuming time shorter, can not only effectively solve the pipe joint stopping, and the effective control earth's surface subsides, and can make the construction of pushing forward have more the continuity and effectively improve pipe-jacking efficiency of construction.
Description
Technical Field
The invention relates to the technical field of underground mechanical underground excavation construction, in particular to an automatic stopping device for a rectangular jacking pipe with a pawl, which is particularly suitable for long-distance rectangular jacking pipe construction and construction.
Background
In recent years, the 'green, safe, environment-friendly and efficient' rectangular pipe jacking technology has the advantages of avoiding ground traffic improvement and underground pipeline removal, causing little disturbance to soil bodies and little influence to urban ground environment during construction, can effectively control the surface subsidence, has the characteristics of high mechanization degree and the like, is gradually widely applied to the development of urban underground space, in the jacking process of the pipe jacking technology, a jack provides jacking force to overcome the front water and soil pressure and side frictional resistance borne by a pipe jacking machine and a pipe joint, but when the pipe joints are installed, the jack cylinder retracts, the jacking force can be removed, at the moment, the side frictional resistance is smaller than the water and soil pressure on the front side of the pipe pushing machine, the pipe pushing machine and the pushed pipe joints can be retracted, the soil body on the excavated surface is unstable, therefore, the ground surface subsidence is caused, and in order to prevent the ground surface subsidence caused by the withdrawal of the pipe jacking machine and the pipe joints, a pipe jacking stopping device is usually required to be arranged or other measures are taken.
Looking up the existing pipe-jacking construction data and related patents, the current measures for preventing pipe-jacking from returning are mainly two, one is to arrange a pre-embedded steel connecting piece on the wall of an originating well, and when a jack needs to be retracted, the related steel connecting piece is welded or rotated to connect a pipe joint and the wall of the originating well into a whole, so that the method needs to be continuously disassembled and assembled, and is complex in operation and more in time consumption; another kind is for setting up special stopping device, inserts the tube coupling with the stopping round pin and reserves the hole for hoist to be fixed in on the stopping equipment and can prevent that the tube coupling from returning, the device can occupy certain workspace, needs manual operation, and degree of automation is low, and work efficiency is lower.
Disclosure of Invention
In order to solve the problems, the invention aims to disclose the technical field of underground mechanical method underground excavation construction, and particularly relates to a rectangular jacking pipe automatic stopping device with a pawl.
In order to achieve the purpose, the invention adopts the technical scheme that: the rectangular pipe jacking automatic retaining device with the pawl comprises a pipe jacking machine, an oil cylinder frame, a jack oil cylinder, a jacking iron, a guide rail and a plurality of sections of pipe joints, wherein the automatic retaining device comprises retaining parts and fixing parts, and the retaining parts are horizontally and symmetrically arranged on two sides of each pipe joint along the length direction of the pipe joint and used for fixing the pipe joints;
the anti-return component comprises a working support and a pawl which are integrally formed, a reserved groove matched with the pawl is formed in the surface of the pipe joint, and the pawl is connected with the reserved groove in a sliding fit mode; the fixing part is used for fixing the retaining part and providing counter force for preventing the push bench and the pipe joint from returning, and comprises a fixing support, a fixing bolt, a spring and a spring fixing device;
the tail part of the working support is provided with a tooth-shaped structure, the tail part of the working support is connected with the fixed support in a tooth shape, and a reserved hole for inserting the fixing bolt is formed between the teeth; the pawl is used as a main stressed component and structurally arranged as a wedge block, the wedge block comprises a wedge block front surface and a wedge block back surface, the wedge block front surface is a plane, the wedge block back surface is a wedge surface, and a lubricating layer is arranged on the surface of the wedge surface;
the fixed support is a main bearing component, a fixed bolt is arranged on the front surface of the fixed support, the back surface of the fixed support is fixed on the side wall of the well wall of the starting well, the fixed bolt is arranged at the tail part of the working support of the stopping component and used for restraining the displacement of the stopping component in the vertical direction and the horizontal direction, the stopping component horizontally rotates around the fixed bolt, the spring is connected between the fixed support and the working support so as to limit the rotating stroke of the stopping component relative to the fixed component, and spring fixing devices are respectively arranged at two ends of the spring and fixedly connected with the fixed support and the working support.
Preferably, the retaining devices are arranged on the lower half part of the pipe joint, and at least one group of retaining devices is arranged.
Preferably, the backstop member is provided with at least one pawl.
Preferably, the retaining member comprises a working support and three pawls.
Preferably, the retaining device comprises a retaining state and a non-retaining state, and when the retaining device is in the retaining state, the pawl slides into a reserved groove on the surface of the pipe joint; when the retaining device is in a non-retaining state, the pawl slides out of the reserved groove and is tightly attached to the outer wall of the pipe joint under the action of the tensile force of the spring, and the pipe joint horizontally moves relative to the retaining device.
Preferably, the spring is arranged on one side surface of the fixed support and the working support close to the pipe joint.
Preferably, the preformed groove is wedge-shaped, the surface of the preformed groove close to the side wall of the well wall of the initial well is a front surface and is of a plane structure, the back surface of the preformed groove is a wedge surface, the surface of the preformed groove is provided with a preformed groove steel plate matched with the preformed groove in shape, and the surface of the preformed groove steel plate is provided with a lubricating layer.
Preferably, the section form of reserve groove is trapezoidal, and its long limit sets up to 100mm, and its minor face sets up to 50mm, and the width of reserve groove sets up to 100mm, and its degree of depth sets up to 60mm, and every reserve groove interval sets up to 50mm, and the thickness of reserve channel-section steel is 5 mm.
The invention has the beneficial effects that: the rectangular pipe jacking automatic retaining device with the pawl has the advantages that the device is simple in structure, does not occupy working space, does not need manual operation, is high in automation degree, consumes less time, is more continuous in construction, can effectively solve the problem of withdrawal of a pipe jacking machine and a pipe joint, effectively controls surface subsidence, enables jacking construction to be more continuous, and effectively improves pipe jacking construction efficiency.
Drawings
FIG. 1 is a cross-sectional view of a rectangular push pipe automatic stop device with a pawl according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a rectangular push pipe automatic retaining device with a pawl according to an embodiment of the present invention.
FIG. 3 is a partial plan view of a rectangular push pipe automatic stop device with a pawl in a stop state according to an embodiment of the present invention.
FIG. 4 is a partial plan view of a rectangular push pipe automatic stop device with a pawl in a non-stop state according to an embodiment of the present invention.
FIG. 5 is a partial cross-sectional view of a rectangular push pipe automatic stop device with a pawl according to an embodiment of the present invention in a non-stop state.
FIG. 6 is a plan view of the rectangular push pipe automatic stop device with a pawl according to an embodiment of the present invention.
FIG. 7 is a sectional view of a rectangular automatic pipe jacking device with a pawl according to an embodiment of the present invention.
FIG. 8 is a plan view of a pipe joint pre-groove of a rectangular pipe jacking automatic retaining device with a pawl according to an embodiment of the present invention.
FIG. 9 is a sectional view of a pipe joint pre-groove of a rectangular pipe jacking automatic retaining device with a pawl according to an embodiment of the present invention.
FIG. 10 is an elevation view of a rectangular top pipe automatic stop device with a pawl according to an embodiment of the present invention.
Reference is made to the accompanying drawings in which:
the device comprises a pipe jacking machine 1, a pipe joint 2, a pipe joint 3, a backstop device 4, a well wall side wall of a starting well, a jacking iron 5, a jack oil cylinder 6, an oil cylinder frame 7, a guide rail 8, a reserved groove 9, a pipe joint 21-Nth-1, a pipe joint 22-Nth, a pipe joint 23-Nth +1, a pipe joint 24-Nth +2, a backstop part 31, a fixing part 32, a pipe joint reserved groove 229-Nth, a reserved groove 239-Nth +1, a working support 311, a pawl 312, a fixing support 321, a fixing bolt 322, a spring 323, a spring fixing device 324, a reserved groove steel plate 91 and an anchor bar 92.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings:
the invention provides a rectangular pipe jacking automatic retaining device 3 with a pawl 312, which comprises a pipe jacking machine 1, an oil cylinder frame 7, a jack oil cylinder 6, a jacking iron 5, a guide rail 8 and a plurality of sections of pipe joints 2, wherein the automatic retaining device 3 comprises retaining parts 31 and fixing parts 32, the retaining parts 31 are horizontally and symmetrically arranged on two sides of the pipe joints 2 along the length direction of the pipe joints 2 and used for fixing the pipe joints 2, in the embodiment, the retaining devices 3 are arranged on the lower half parts of the pipe joints 2, and at least one group of retaining devices 3 is arranged; the pipe jacking stopping device 3 realizes the technology of stopping the pipe jacking machine 1 and the pipe joint 2 under the matching action of the stopping component 31, the fixing component 32 and other devices in the process of continuously jacking the pipe jacking machine 1 and the pipe joint 2;
the retaining component 31 comprises a working support 311 and a pawl 312 which are integrally formed, a reserved groove 9 matched with the pawl 312 is formed in the surface of the pipe joint 2, and the pawl 312 is connected with the reserved groove 9 in a sliding fit mode; the fixing part 32 is used for fixing the retaining part 31 and providing counter force for preventing the push bench 1 and the pipe joint 2 from retracting, and the fixing part 32 comprises a fixing support 321, a fixing bolt 322, a spring 323 and a spring fixing device 324;
the working support 311 is a force transmission component, the pawl 312 is a main stress component, the structure of the pawl is a wedge, preferably a wedge-shaped steel component, and the wedge comprises a wedge front surface and a wedge back surface, wherein the wedge front surface is a plane, a stress surface and a side close to the door, the wedge back surface is a wedge surface, a sliding surface and a side far away from the door, and a lubricating layer is arranged on the surface of the wedge surface;
the fixed support 321 is a main bearing component, the front surface of the fixed support 321 is provided with a fixed bolt 322, the back surface of the fixed support is fixed on the sidewall 4 of the well wall of the starting well, and the fixed support 321 is convenient to disassemble and assemble and can bear enough load;
the fixing bolt 322 is arranged at the tail of the working support 311 of the retaining component 31 and used for restricting the displacement of the retaining component 31 in the vertical and horizontal directions, the retaining component 31 horizontally rotates around the fixing bolt 322, the spring 323 is connected between the fixing support 321 and the working support 311 to limit the rotation stroke of the retaining component 31 relative to the fixing component 32, and two ends of the spring 323 are respectively provided with a spring fixing device 324 fixedly connected with the fixing support 321 and the working support 311;
in order to ensure the working stability of the retaining member 31, in this embodiment, the retaining member 31 includes a working support 311 and three pawls 312, the pawls 312 and the working support 311 are formed by cutting a whole steel plate, the tail of the working support 311 is provided with a tooth-shaped structure and is provided with a reserved insertion hole, the tail of the working support 311 is connected with the fixed support 321 in a tooth shape, and a reserved hole for inserting the fixing bolt 322 is formed between the teeth;
the retaining device 3 comprises a retaining state and a non-retaining state, and when the retaining device 3 is in the retaining state, the pawl 312 slides into the reserved groove 9 on the surface of the pipe joint 2; when the retaining device 3 is in a non-retaining state, the pawl slides out of the reserved groove 9 and clings to the outer wall of the pipe joint 2 under the action of the tensile force of the spring 323, and the pipe joint 2 moves horizontally relative to the retaining device 3;
the spring 323 is arranged on the fixed support 321 and one side surface of the working support 311 close to the pipe joint 2, and has enough elastic coefficient, and the spring 323 is in tension when in the stopping state and the non-stopping state of the stopping device 3;
when the retaining device 3 is converted from the non-retaining state to the retaining state, namely the preformed groove 9 moves forward to the position near the pawl 312 along with the pipe joint 2, the pawl 312 naturally slides into the preformed groove 9 and is tightly clamped in the preformed groove 9 under the action of the spring 323; when the retaining device 3 is converted from the retaining state to the non-retaining state, namely under the thrust action of the jack cylinder 6, the pipe joint 2 moves forwards, the pawl 312 slides out of the reserved groove 9 and is continuously attached to the outer wall of the pipe joint 2 under the action of the spring 323;
as shown in fig. 8-10, the positions and the number of the preformed grooves 9 should correspond to the pawls 312, and should avoid the positions of the main bars of the pipe joint 2, while leaving enough thickness of the protective layer for the reinforcing bars; the reserved groove 9 is wedge-shaped, one surface of the reserved groove, close to the side wall 4 of the well wall of the starting well, is a front surface and is of a plane structure, the back surface of the reserved groove is a wedge surface, the arrangement of a wedge angle of the wedge surface ensures that the pawl 312 can naturally slide out when the pipe joint 2 is subjected to the action of a pushing force, a reserved groove steel plate 91 matched with the reserved groove 9 in shape is arranged on the surface of the reserved groove 9, a lubricating layer is arranged on the surface of the reserved groove steel plate 91, and the size of the reserved groove 9 is slightly larger than that of the pawl 312 in order to ensure that the;
in this embodiment, the section of each of the preformed grooves 9 is trapezoidal, the long side of each of the preformed grooves is 100mm, the short side of each of the preformed grooves is 50mm, the width of each of the preformed grooves 9 is 100mm, the depth of each of the preformed grooves is 60mm, the distance between every two of the preformed grooves 9 is 50mm, and the thickness of each of the preformed groove steel plates 91 is 5 mm;
specifically, to make the working process of the retaining device 3 more clear, as shown in fig. 3-5, the pipe joint 2 includes an N-1 th pipe joint 21, an N-1 th pipe joint 22, an N +1 th pipe joint 23, and an N +2 th pipe joint 24, the reserve groove 9 includes an N-1 th pipe joint reserve groove 229 and an N +1 th pipe joint reserve groove 239 respectively disposed on the N-1 th pipe joint 22 and the N +1 th pipe joint 23, before the N +1 th pipe joint 23 is installed, the jack cylinder 6 is pushed forward, the retaining device 3 is fixed on the wall 4 of the well bore, under the action of the pushing force, the N +1 th pipe joint reserve groove 239 moves forward along with the N +1 th pipe joint 23 to the pawl 312 and naturally slides into the N +1 th pipe joint reserve groove 239, and then the cylinder retracts, at this time, the retaining member 31 is in the retaining state to play the retaining function; when the (N + 1) th pipe joint 23 is installed and starts to jack, the jack cylinder 6 pushes forward to gradually apply jacking force to the pipe pushing machine 1 and the pipe joint 2, at the moment, the pawl 312 slides out of the (N + 1) th pipe joint reserved groove 239, continuously clings to the outer wall of the pipe joint 2 under the action of the spring 323, and moves relative to the pipe joint, at the moment, the retaining part 31 is in a non-retaining state, and when the subsequent pipe joint 2 is installed and jacked, the working process is repeated.
The above embodiments are only preferred embodiments of the present invention, and not intended to limit the technical scope of the present invention, and those skilled in the art may make modifications and variations within the spirit of the present invention, and all modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. The rectangular pipe jacking automatic retaining device with the pawl comprises a pipe jacking machine, an oil cylinder frame, a jack oil cylinder, a jacking iron, a guide rail and a plurality of sections of pipe joints, and is characterized in that the automatic retaining device comprises retaining parts and fixing parts, wherein the retaining parts are horizontally and symmetrically arranged on two sides of each pipe joint along the length direction of the pipe joint and used for fixing the pipe joints;
the anti-return component comprises a working support and a pawl which are integrally formed, a reserved groove matched with the pawl is formed in the surface of the pipe joint, and the pawl is connected with the reserved groove in a sliding fit mode; the fixing part is used for fixing the retaining part and providing counter force for preventing the push bench and the pipe joint from returning, and comprises a fixing support, a fixing bolt, a spring and a spring fixing device;
the tail part of the working support is provided with a tooth-shaped structure, the tail part of the working support is connected with the fixed support in a tooth shape, and a reserved hole for inserting the fixing bolt is formed between the teeth; the pawl is used as a main stressed component and structurally arranged as a wedge block, the wedge block comprises a wedge block front surface and a wedge block back surface, the wedge block front surface is a plane, the wedge block back surface is a wedge surface, and a lubricating layer is arranged on the surface of the wedge surface;
the fixed support is a main bearing component, a fixed bolt is arranged on the front surface of the fixed support, the back surface of the fixed support is fixed on the side wall of the well wall of the starting well, the fixed bolt is arranged at the tail part of the working support of the stopping component and used for restraining the displacement of the stopping component in the vertical direction and the horizontal direction, the stopping component horizontally rotates around the fixed bolt, the spring is connected between the fixed support and the working support so as to limit the rotating stroke of the stopping component relative to the fixed component, and spring fixing devices are respectively arranged at two ends of the spring and fixedly connected with the fixed support and the working support.
2. The rectangular push pipe automatic backstop device with the pawl is characterized in that the backstop device is arranged on the lower half part of a pipe joint, and at least one group of backstop devices is arranged.
3. The rectangular push pipe automatic retaining device with the pawls as claimed in claim 1, wherein the retaining member is provided with at least one pawl.
4. The rectangular push pipe automatic retaining device with the pawls as claimed in claim 1 or 3, wherein the retaining member comprises a working support and three pawls.
5. The rectangular pipe jacking automatic stopping device with the pawl is characterized in that the stopping device comprises a stopping state and a non-stopping state, and when the stopping device is in the stopping state, the pawl slides into a reserved groove in the surface of a pipe joint; when the retaining device is in a non-retaining state, the pawl slides out of the reserved groove and is tightly attached to the outer wall of the pipe joint under the action of the tensile force of the spring, and the pipe joint horizontally moves relative to the retaining device.
6. The automatic rectangular pipe jacking stop device with the pawl according to claim 5, wherein the spring is arranged on one side of the fixed support and the working support close to the pipe joint.
7. The rectangular pipe jacking automatic retaining device with the pawls as claimed in claim 6, wherein the pre-groove is wedge-shaped, the side of the pre-groove close to the side wall of the well wall of the initial well is a front side and is of a plane structure, the back side of the pre-groove is a wedge surface, the surface of the pre-groove is provided with a pre-groove steel plate matched with the shape of the pre-groove, and the surface of the pre-groove steel plate is provided with a lubricating layer.
8. The rectangular pipe jacking automatic retaining device with the pawls as claimed in claim 7, wherein the sectional form of the preformed groove is trapezoidal, the long side of the preformed groove is set to be 100mm, the short side of the preformed groove is set to be 50mm, the width of the preformed groove is set to be 100mm, the depth of the preformed groove is set to be 60mm, the distance between every two preformed grooves is set to be 50mm, and the thickness of the preformed groove steel is 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421180.0A CN112901184A (en) | 2021-04-19 | 2021-04-19 | Automatic stopping device of rectangle push pipe with pawl |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421180.0A CN112901184A (en) | 2021-04-19 | 2021-04-19 | Automatic stopping device of rectangle push pipe with pawl |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112901184A true CN112901184A (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110421180.0A Pending CN112901184A (en) | 2021-04-19 | 2021-04-19 | Automatic stopping device of rectangle push pipe with pawl |
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| Country | Link |
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| CN (1) | CN112901184A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215525A (en) * | 2021-12-14 | 2022-03-22 | 中铁工程装备集团有限公司 | Stopping device, upward jacking type vertical shaft tunneling equipment and vertical shaft construction method |
| CN115012950A (en) * | 2022-06-08 | 2022-09-06 | 中铁一局集团(广州)建设工程有限公司 | Water-rich sand layer pipe jacking construction method close to subway |
| CN115958686A (en) * | 2023-02-01 | 2023-04-14 | 新乡市瑞特机械有限公司 | Transfer trolley for continuous maintenance of concrete dropping leaking plate |
-
2021
- 2021-04-19 CN CN202110421180.0A patent/CN112901184A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215525A (en) * | 2021-12-14 | 2022-03-22 | 中铁工程装备集团有限公司 | Stopping device, upward jacking type vertical shaft tunneling equipment and vertical shaft construction method |
| CN115012950A (en) * | 2022-06-08 | 2022-09-06 | 中铁一局集团(广州)建设工程有限公司 | Water-rich sand layer pipe jacking construction method close to subway |
| CN115958686A (en) * | 2023-02-01 | 2023-04-14 | 新乡市瑞特机械有限公司 | Transfer trolley for continuous maintenance of concrete dropping leaking plate |
| CN115958686B (en) * | 2023-02-01 | 2023-08-29 | 新乡市瑞特机械有限公司 | Transfer trolley for continuous curing of concrete manure leakage plates |
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