CN219571055U - Top iron device for pipe jacking construction - Google Patents
Top iron device for pipe jacking construction Download PDFInfo
- Publication number
- CN219571055U CN219571055U CN202320382567.4U CN202320382567U CN219571055U CN 219571055 U CN219571055 U CN 219571055U CN 202320382567 U CN202320382567 U CN 202320382567U CN 219571055 U CN219571055 U CN 219571055U
- Authority
- CN
- China
- Prior art keywords
- jacking
- iron
- shaped top
- shaped
- pipeline
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 104
- 238000010276 construction Methods 0.000 title claims abstract description 38
- 210000001503 joint Anatomy 0.000 claims abstract description 27
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 19
- 235000000396 iron Nutrition 0.000 abstract description 54
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 14
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 230000007547 defect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model relates to the technical field of pipe jacking construction equipment, and discloses a top iron device for pipe jacking construction, which comprises a jack, a guide rail and a pipeline, wherein the jack is installed in a working pit, the guide rail is installed in the working pit, the pipeline is installed in the working pit and is positioned on the guide rail and made of reinforced concrete, and a pipe jacking component is installed on the guide rail and positioned between the jack and the pipeline; wherein, the push pipe part includes U type top iron, is provided with butt joint integrated configuration on the U type top iron. According to the utility model, the U-shaped top irons can be arranged into a plurality of U-shaped top irons which are arranged in a straight line, and the adjacent U-shaped top irons are all installed and butted through the butt joint combined structure, so that the problem that when the service length of the U-shaped top irons needs to be prolonged in a pipe jacking construction process, the U-shaped top irons can be prolonged through the butt joint combined structure, the U-shaped top irons can be disassembled through the butt joint combined structure, and the U-shaped top irons are stacked and placed in the vertical direction after being disassembled, so that the U-shaped top irons can be conveniently carried out and transported.
Description
Technical Field
The utility model relates to the technical field of pipe jacking construction equipment, in particular to a top iron device for pipe jacking construction.
Background
The pipe jacking construction is a method for jacking a pipeline into a specified track according to a designed gradient and carrying away earthwork by overcoming the friction force between the pipeline and surrounding soil by means of the jacking force generated by jacking equipment in a working pit. And when the first section of pipeline is constructed, continuing the construction of the second section of pipeline.
The jacking iron plays a role in transferring and dispersing stress in the jacking system, the jacking system comprises jacks and guide rails, the power part is mainly the jacks, the jacks are arranged in a plurality, the jacks are sequentially arranged on the end face of one end of the jacking iron, and the pipeline is jacked under the action of the guide rails through the mutual matching of the jacks and the jacking iron.
For the top iron, it is required to be able to withstand the stress generated by the jacking equipment without deformation, and to be convenient for handling and transportation.
In the existing construction process, there are two types of cylindrical top irons and U-shaped top irons, for example, in chinese patent document with patent publication No. CN216583969U, which discloses a top pipe top iron, and the technical problems of the defects of the cylindrical top iron in the pipe construction are as follows: the short-distance jacking can adopt a cylindrical jacking iron as a force transmission device of the jacking pipe jack and the reinforced concrete pipeline. However, for long-distance or ultra-long-distance pipe jacking construction, jacking by adopting a jacking column is equivalent to the contact between a single point and a pipe wall, so that the pipe jacking instability and the pipeline rupture are easy to occur due to uneven stress.
Therefore, when the cylindrical top irons are used in the prior art, the number of the cylindrical top irons is usually two, as shown in the specification drawing of the patent document, the two cylindrical top irons are arranged on two sides of the pipeline, and when the two cylindrical top irons are in contact with the pipeline in the jacking process of the jack, the two cylindrical top irons are in point contact in practice, and when the stress generated by the jack on the two cylindrical top irons is large, the phenomenon of pipe jacking instability and pipeline cracking easily occurs.
Meanwhile, the U-shaped top iron used in the patent document can solve the problem caused by the cylindrical top iron, but as can be seen from the description of the specification and the drawings of the specification, certain technical defects still exist, for example, when the use length of the U-shaped top iron needs to be prolonged, it is difficult to butt-joint a plurality of U-shaped top irons in pairs.
Disclosure of Invention
The utility model aims to solve the defects in the prior art, and provides a top iron device for top pipe construction.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the jacking iron device for jacking pipe construction comprises a jack, a guide rail and a pipeline, wherein the jack is installed in a working pit, the guide rail is installed in the working pit, the pipeline is installed in the working pit and is positioned on the guide rail, the jack is horizontally installed, a piston rod of the jack faces the pipeline, and a jacking pipe component is installed on the guide rail and positioned between the jack and the pipeline;
the pipe jacking component comprises a U-shaped top iron, and a butt joint combined structure is arranged on the U-shaped top iron.
As the preferable technical scheme, the opening of the U-shaped top iron is upward, and the bottom of the outer side wall of the U-shaped top iron is in sliding connection with the guide rail.
As an optimal technical scheme, one end of the U-shaped top iron is abutted against the end part of a piston rod of the jack, and the other end of the U-shaped top iron is abutted against the lower side of the circular end face of the pipeline to form surface contact.
As the preferable technical scheme, the U-shaped top iron is provided with an intrados, and a plurality of reinforcing ribs are fixedly arranged on the intrados.
As a preferable technical scheme, a plurality of reinforcing ribs are arranged on the intrados at equal intervals.
As an optimal technical scheme, the butt joint combined structure comprises a U-shaped jacking pipe head fixedly arranged on one side end surface of a U-shaped jacking iron and a U-shaped clamping groove formed in the end surface of one end of the U-shaped jacking iron opposite to the U-shaped jacking pipe head;
when the U-shaped top iron is arranged in a plurality of U-shaped top irons, the U-shaped top pipe head can be inserted and installed in the U-shaped clamping groove.
Compared with the prior art, the utility model has the beneficial effects that:
1. in order to solve the problem that in the existing pipe jacking construction process, only a U-shaped top iron can be singly used, the utility model comprises the following steps: when the length of use of needs extension U type top iron, it is difficult to carry out two liang of butt joints with a plurality of U type top irons, consequently, in this embodiment, can set up a plurality of U type top irons, and a plurality of U type top irons carry out sharp range, all install the butt joint through butt joint integrated configuration between the adjacent U type top iron to can solve when the length of use of needs extension U type top iron in push pipe construction technology, can prolong a plurality of U type top irons through butt joint integrated configuration.
2. In the utility model, the plurality of U-shaped top irons can be installed through the butt joint combination structure, otherwise, the U-shaped top irons can be disassembled through the butt joint combination structure, and the U-shaped top irons are stacked and placed in the vertical direction after being disassembled, so that the U-shaped top irons can be conveniently carried and transported.
3. According to the utility model, one end of the U-shaped top iron is abutted against the end part of the piston rod of the jack, and the other end is abutted against the lower side of the circular end surface of the pipeline and is in surface contact, and as the end of the U-shaped top iron facing the pipeline is in surface contact with the lower side of the circular end surface of the pipeline, the situation that the pipe is unstable and broken due to uneven stress of the pipeline in the jacking process is avoided.
4. According to the utility model, under the action of the plurality of reinforcing ribs, the rigidity intensity of the U-shaped top iron can be enhanced, the reinforcing ribs are arranged on the inner cambered surface at equal intervals, so that when the U-shaped top iron and the plurality of reinforcing ribs are stressed, the stress between the adjacent reinforcing ribs is the same, the whole U-shaped top iron is more stable, and the U-shaped top iron can bear larger stress without deformation.
5. According to the utility model, when the number of the U-shaped top irons is multiple, the U-shaped top pipe heads can be inserted and installed in the U-shaped clamping grooves, so that the installation and the butt joint of the multiple U-shaped top irons can be facilitated.
Drawings
Fig. 1 is a schematic three-dimensional structure of a U-shaped top iron in a top iron device for pipe jacking construction according to the present utility model;
fig. 2 is a schematic three-dimensional structure diagram of a jacking iron device for jacking pipe construction, wherein two U-shaped jacking irons are butted and combined;
fig. 3 is a schematic three-dimensional structure diagram of a jacking iron device for jacking pipe construction, in which two U-shaped jacking irons are combined and opened;
fig. 4 is a schematic structural diagram of a jacking system in a jacking iron device for jacking pipe construction.
In the figure: 1. a jack; 2. a guide rail; 3. a push pipe part; 31. a U-shaped top iron; 311. an intrados surface; 312. reinforcing ribs; 313. a U-shaped top tube head; 314. u-shaped clamping groove.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
The pipe jacking construction is a method for jacking a pipeline into a specified track according to a designed gradient and carrying away earthwork by overcoming the friction force between the pipeline and surrounding soil by means of the jacking force generated by jacking equipment in a working pit. And when the first section of pipeline is constructed, continuing the construction of the second section of pipeline.
The jacking iron plays a role in transferring and dispersing stress in the jacking system, the jacking system comprises jacks and guide rails, the power part is mainly the jacks, the jacks are arranged in a plurality, the jacks are sequentially arranged on the end face of one end of the jacking iron, and the pipeline is jacked under the action of the guide rails through the mutual matching of the jacks and the jacking iron.
For the top iron, it is required to be able to withstand the stress generated by the jacking equipment without deformation, and to be convenient for handling and transportation.
In the existing construction process, there are two types of cylindrical top irons and U-shaped top irons, for example, in chinese patent document with patent publication No. CN216583969U, which discloses a top pipe top iron, and the technical problems of the defects of the cylindrical top iron in the pipe construction are as follows: the short-distance jacking can adopt a cylindrical jacking iron as a force transmission device of the jacking pipe jack and the reinforced concrete pipeline. However, for long-distance or ultra-long-distance pipe jacking construction, jacking by adopting a jacking column is equivalent to the contact between a single point and a pipe wall, so that the pipe jacking instability and the pipeline rupture are easy to occur due to uneven stress.
The inventor has worked for a long time to perform pipe jacking construction, and found that when cylindrical top irons are used in the prior art, the number of the cylindrical top irons is usually two, as shown in the specification drawing of the patent document, the two cylindrical top irons are arranged on two sides of a pipeline, and when the two cylindrical top irons are contacted with the pipeline in the jacking process of a jack, the point contact is actually equivalent, and when the stress generated by the jack on the two cylindrical top irons is large, the phenomena of pipe jacking instability and pipeline breakage are easy to occur.
Meanwhile, for the U-shaped top iron used in the patent document, the problem caused by the cylindrical top iron can be solved, however, as can be seen from the description of the specification and the attached drawing, certain technical defects still exist, for example, when the service length of the U-shaped top iron needs to be prolonged, it is difficult to butt-joint a plurality of U-shaped top irons in pairs, and in order to solve the technical problem, the device is more convenient for pipe jacking construction:
referring to fig. 1-4, the present utility model provides a technical solution:
as shown in fig. 1 to 4, a jacking iron device for jacking pipe construction comprises a jack 1 installed in a working pit, a guide rail 2 installed in the working pit and a pipeline which is installed in the working pit and is positioned on the guide rail 2 and is made of reinforced concrete, wherein the jack 1 is horizontally installed, a piston rod of the jack 1 faces the pipeline, and a jacking pipe part 3 is installed on the guide rail 2 and positioned between the jack 1 and the pipeline;
wherein, push pipe part 3 includes U type top iron 31, is provided with butt joint integrated configuration on the U type top iron 31.
In order to solve the problem that in the existing pipe jacking construction process, only the U-shaped top iron 31 can be used singly, for example: when the length of use of U type top iron needs to be prolonged, it is difficult to carry out two liang of butt joints with a plurality of U type top iron, consequently, in this embodiment, can set up U type top iron 31 into a plurality of, a plurality of U type top iron 31 carry out the inline, all install the butt joint through butt joint integrated configuration between the adjacent U type top iron 31 to can solve when the length of use of needs extension U type top iron in push pipe construction technology, can prolong a plurality of U type top iron 31 through butt joint integrated configuration.
Meanwhile, in the present embodiment, since the plurality of U-shaped top irons 31 can be mounted through the butt joint combination structure, otherwise, they can be disassembled through the butt joint combination structure, and stacked in the vertical direction after being disassembled, thereby being convenient for carrying and transporting.
Example two
As shown in fig. 1 to 4, the improvement is based on the first embodiment:
further, the opening of the U-shaped top iron 31 is upward, and the bottom of the outer side wall of the U-shaped top iron 31 is slidably connected with the guide rail 2.
In this embodiment, the bottom of the cylinder barrel of the jack 1 is abutted against the wall surface of the working pit, the end of the piston rod of the jack 1 is abutted against one end surface of the U-shaped top iron 31, the U-shaped top iron 31 can slide on the guide rail 2 through the jack 1, and in the sliding process, the other end is abutted against the circular end surface of the pipeline, so that the jacking of the pipeline is realized.
Further, one end of the U-shaped top iron 31 is abutted against the end of the piston rod of the jack 1, and the other end is abutted against the lower side of the circular end face of the pipe, and surface contact is formed.
In the present embodiment, since the end of the U-shaped top iron 31 facing the pipe forms surface contact with the lower side of the circular end surface of the pipe, the situation that the pipe is unstable and broken due to uneven stress in the jacking process is avoided.
Further, the U-shaped top iron 31 has an inner arc surface 311, and a plurality of reinforcing ribs 312 are fixedly installed on the inner arc surface 311.
In the present embodiment, the rigidity strength of the U-shaped top iron 31 can be enhanced by the plurality of reinforcing ribs 312.
Further, a plurality of reinforcing ribs 312 are arranged equidistantly on the intrados 311.
In this embodiment, the reinforcing ribs 312 are equidistantly arranged on the inner cambered surface 311, so that when the U-shaped top iron 31 and the plurality of reinforcing ribs 312 are stressed, the stress between the adjacent reinforcing ribs 312 is the same, and therefore, the whole of the U-shaped top iron 31 is more stable, and the U-shaped top iron 31 can bear larger stress without deformation.
Further, the butt joint combined structure comprises a U-shaped jacking pipe head 313 fixedly installed on one side end surface of the U-shaped jacking iron 31, and a U-shaped clamping groove 314 formed on the end surface of the U-shaped jacking iron 31 opposite to the U-shaped jacking pipe head 313;
when the U-shaped top irons 31 are provided in plurality, the U-shaped push pipe heads 313 can be inserted and installed in the U-shaped clamping grooves 314, so that the plurality of U-shaped top irons 31 can be conveniently installed and abutted in pairs.
In summary, the working procedure of the utility model: in order to solve the problem that in the existing pipe jacking construction process, only the U-shaped top iron 31 can be used singly, for example: when the service length of the U-shaped top irons needs to be prolonged, the U-shaped top irons are difficult to butt-joint in pairs, so that in the embodiment, the U-shaped top irons 31 can be arranged into a plurality of U-shaped top irons, the U-shaped top irons 31 are arranged in a straight line, and the adjacent U-shaped top irons 31 are all installed and butt-jointed through a butt joint combined structure, so that in the jacking pipe construction process, the problem that when the service length of the U-shaped top irons needs to be prolonged, the U-shaped top irons 31 can be prolonged through the butt joint combined structure is solved;
the plurality of U-shaped top irons 31 can be installed through the butt joint combination structure, otherwise, the U-shaped top irons can be disassembled through the butt joint combination structure, and are stacked in the vertical direction after being disassembled, so that the U-shaped top irons can be conveniently carried and transported;
the bottom of the cylinder barrel of the jack 1 is abutted against the wall surface of the working pit, the end part of the piston rod of the jack 1 is abutted against one end face of the U-shaped top iron 31, the U-shaped top iron 31 can slide on the guide rail 2 through the jack 1, and in the sliding process, the other end of the U-shaped top iron is abutted against the circular end face of the pipeline, so that the jacking of the pipeline is realized;
one end of the U-shaped top iron 31 is abutted against the end part of a piston rod of the jack 1, the other end is abutted against the lower side of the circular end surface of the pipeline and is in surface contact, and as the U-shaped top iron 31 is in surface contact with the lower side of the circular end surface of the pipeline towards one end of the pipeline, the situation that the pipe jacking instability and the pipe cracking are caused by uneven stress of the pipeline in the jacking process is avoided;
under the action of the plurality of reinforcing ribs 312, the rigidity strength of the U-shaped top iron 31 can be enhanced, the reinforcing ribs 312 are arranged on the inner cambered surface 311 at equal intervals, and the U-shaped top iron 31 and the plurality of reinforcing ribs 312 can bear the same stress between the adjacent reinforcing ribs 312 when being stressed, so that the whole of the U-shaped top iron 31 is more stable, and the U-shaped top iron 31 can bear larger stress without deformation;
when the U-shaped top irons 31 are provided in plurality, the U-shaped push pipe heads 313 can be inserted and installed in the U-shaped clamping grooves 314, so that the plurality of U-shaped top irons 31 can be conveniently installed and abutted in pairs.
The above-mentioned different embodiments can be mutually combined, replaced and matched for use.
None of the utility models are related to the same or are capable of being practiced in the prior art. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a top iron device for push pipe construction, includes installs jack (1) in the work pit, installs guide rail (2) in the work pit to and install in the work pit and be in the pipeline of being made by reinforced concrete on guide rail (2), its characterized in that: the jack (1) is horizontally arranged, a piston rod of the jack (1) faces towards the pipeline, and a pipe jacking component (3) is arranged on the guide rail (2) and positioned between the jack (1) and the pipeline;
the pipe jacking component (3) comprises a U-shaped top iron (31), and a butt joint combined structure is arranged on the U-shaped top iron (31).
2. The jacking iron device for jacking pipe construction according to claim 1, wherein: the opening of the U-shaped top iron (31) is upward, and the bottom of the outer side wall of the U-shaped top iron (31) is in sliding connection with the guide rail (2).
3. The jacking iron device for jacking pipe construction according to claim 2, wherein: one end of the U-shaped top iron (31) is abutted against the end part of a piston rod of the jack (1), and the other end of the U-shaped top iron is abutted against the lower side of the circular end face of the pipeline to form surface contact.
4. The jacking iron device for jacking pipe construction according to claim 3, wherein: the U-shaped top iron (31) is provided with an inner cambered surface (311), and a plurality of reinforcing ribs (312) are fixedly arranged on the inner cambered surface (311).
5. The jacking iron device for jacking pipe construction according to claim 4, wherein: the reinforcing ribs (312) are equidistantly arranged on the inner cambered surface (311).
6. The jacking iron device for jacking pipe construction according to claim 1, wherein: the butt joint combined structure comprises a U-shaped jacking pipe head (313) fixedly arranged on one side end surface of the U-shaped jacking iron (31), and a U-shaped clamping groove (314) formed in the end surface of one end, opposite to the U-shaped jacking pipe head (313), of the U-shaped jacking iron (31);
when the U-shaped top iron (31) is arranged in a plurality of mode, the U-shaped top pipe head (313) can be inserted and installed in the U-shaped clamping groove (314).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320382567.4U CN219571055U (en) | 2023-03-03 | 2023-03-03 | Top iron device for pipe jacking construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320382567.4U CN219571055U (en) | 2023-03-03 | 2023-03-03 | Top iron device for pipe jacking construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219571055U true CN219571055U (en) | 2023-08-22 |
Family
ID=87646676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320382567.4U Active CN219571055U (en) | 2023-03-03 | 2023-03-03 | Top iron device for pipe jacking construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219571055U (en) |
-
2023
- 2023-03-03 CN CN202320382567.4U patent/CN219571055U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211574406U (en) | PCCP pipeline installation device | |
| CN110440052B (en) | Movable smooth jacking mechanism for pipe jacking construction | |
| CN213177042U (en) | Guiding device for pipe jacking construction | |
| CN112128469B (en) | Jacking pipe relay jacking conversion device and construction method | |
| JP6071581B2 (en) | Pipe laying method | |
| CN219571055U (en) | Top iron device for pipe jacking construction | |
| CN104668876A (en) | Quick rounding device for steel cylinder section pairing | |
| CN110258357B (en) | Construction method for steel pipe arch rib segment air connection | |
| CN111894626A (en) | Large-diameter negative ring pipe piece reinforcing construction method | |
| CN209793010U (en) | High-precision, simple and convenient steel pipe butt joint device | |
| CN111550271A (en) | Method for removing shield negative ring duct piece in vertical shaft transverse passage | |
| CN210081084U (en) | Side-entry blowout preventer transferring device | |
| CN216715394U (en) | Old pipe joint separating device | |
| CN215618961U (en) | Positioning device for pouring nodular cast iron jacking pipe | |
| CN209229130U (en) | A kind of circular top iron applied to pipe-jacking with large diameter construction | |
| CN212928987U (en) | Construction equipment for quickly installing pipeline in pipe gallery | |
| CN212026256U (en) | Guide platform for building | |
| CN210034667U (en) | Reinforced anti-settling jacking pipe for trenchless construction | |
| CN210139382U (en) | Petroleum pipeline joint installation device | |
| CN219841143U (en) | Pipeline jacking device | |
| CN220792273U (en) | Automatic tensioning device for pipeline internal pulling method construction | |
| CN219669928U (en) | Special pipeline vertical installation fixing and lifting device | |
| CN111609213A (en) | Construction method for quickly installing pipeline in pipe gallery | |
| CN114215156B (en) | Butt joint installation guiding device for concrete grooved and tongued pipeline | |
| CN212480337U (en) | Adjustable guide rail system for pipe jacking |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |