CN216276479U - Mechanical sleeve joint suitable for high-strength steel bars - Google Patents
Mechanical sleeve joint suitable for high-strength steel bars Download PDFInfo
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- CN216276479U CN216276479U CN202120903658.9U CN202120903658U CN216276479U CN 216276479 U CN216276479 U CN 216276479U CN 202120903658 U CN202120903658 U CN 202120903658U CN 216276479 U CN216276479 U CN 216276479U
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- sleeve
- auxiliary
- steel bars
- close
- main sleeve
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims description 23
- 230000000903 blocking effect Effects 0.000 claims description 14
- 239000004567 concrete Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 35
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 230000001737 promoting effect 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
- 238000005516 engineering process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The application relates to a mechanical sleeve joint suitable for high-strength steel bars, which comprises two steel bars and a main sleeve used for connecting the ends, close to each other, of the two steel bars, wherein the ends, close to each other, of the two steel bars are respectively provided with an external thread, and the directions of the two external threads are opposite; inner rings at two ends of the main sleeve are respectively provided with internal threads in opposite directions; the auxiliary sleeve is connected with the end of the steel bar in a threaded manner, and the outer wall of the auxiliary sleeve is provided with an external thread matched with the internal thread of the main sleeve; the inner ring of the auxiliary sleeve is in a conical shape, the end with the smaller sectional area is positioned at the position where the auxiliary sleeves are close to each other, and the inner diameter of the end with the larger sectional area is equal to the outer diameter of the end of the reinforcing steel bar; when the auxiliary sleeve is connected with the end of the steel bar, the outer wall of the auxiliary sleeve expands towards the inner wall of the main sleeve. This application has and makes when reinforcing bar end external diameter is less, reinforcing bar end can with the inseparable effect of muffjoint.
Description
Technical Field
The application relates to the field of steel bar connection technology, in particular to a mechanical sleeve joint suitable for high-strength steel bars.
Background
In the construction of reinforced concrete structure, the connected mode of reinforcing bar has ligature overlap joint, mechanical connection and welding, in present construction, not only can guarantee the bearing capacity requirement of reinforcing bar because of reinforcing bar mechanical connection, also need very long overlap joint length, also can save the quantity of steel moreover, reinforcing bar mechanical connection still has the construction facility in addition to and connect the higher advantage of quality, so comparatively commonly used in construction.
In the related technology, the mechanical connection of the construction steel bars is mainly realized through a steel bar connecting sleeve, and specifically, external threads are formed on two ends of the steel bars in the length direction in a cutting and rolling mode; the steel bar connecting sleeve is of a circular hollow structure, and an internal thread meshed with the steel bar end threads is arranged in the sleeve, so that when two adjacent steel bars are connected together, the two steel bar ends can be screwed in from the two ends of the steel bar connecting sleeve respectively, and the connection of the two adjacent steel bars is completed when the two ends of the two steel bar ends are abutted to each other.
In view of the above-mentioned related art, the inventor believes that there is a defect that when the precision of the equipment for processing the external thread of the reinforcing steel bar end is insufficient, the external diameter of the reinforcing steel bar end is slightly small, so that the reinforcing steel bar end is too loose when being connected with the sleeve, thereby reducing the connection strength between the reinforcing steel bar and the sleeve.
SUMMERY OF THE UTILITY MODEL
In order when reinforcing bar end external diameter is less, the reinforcing bar end still can be inseparable with muffjoint, this application provides a mechanical muffjoint who is suitable for high-strength steel bar.
The application provides a mechanical muffjoint who is suitable for high-strength steel bar adopts following technical scheme:
a mechanical sleeve joint suitable for high-strength steel bars comprises two steel bars and a main sleeve used for connecting the ends, close to each other, of the two steel bars, wherein external threads are respectively arranged at the ends, close to each other, of the two steel bars, and the directions of the two external threads are opposite; the inner rings at the two ends of the main sleeve are respectively provided with internal threads in opposite directions, and the main sleeve is characterized in that: the auxiliary sleeve is in threaded connection with the end of the steel bar, and an external thread matched with the internal thread of the main sleeve is arranged on the outer wall of the auxiliary sleeve; the inner ring of the auxiliary sleeve is in a conical shape, one end with a smaller sectional area is positioned at the position where the auxiliary sleeves are close to each other, and the inner diameter of the end with the larger sectional area is equal to the outer diameter of the end of the reinforcing steel bar; when the auxiliary sleeve is connected with the end of the steel bar, the outer wall of the auxiliary sleeve expands towards the inner wall of the main sleeve.
By adopting the technical scheme, when two adjacent steel bars are connected together, the two auxiliary sleeves are respectively screwed into the inner rings at the two ends of the main sleeve, the auxiliary sleeve and the main sleeve are in a relatively loose threaded connection state, then the two steel bar ends lean against one end, far away from each other, of the two auxiliary sleeves and are aligned with the inner rings of the auxiliary sleeves, then the main sleeve is rotated, one ends, close to each other, of the two steel bars are gradually close to each other, in the process, the steel bar ends gradually move towards one end, small in the section area, of the inner rings of the auxiliary sleeves, so that the outer walls of the auxiliary sleeves gradually expand towards the inner wall of the main sleeve, when the steel bar ends reach one end, close to each other, of the auxiliary sleeves, the auxiliary sleeves expand tightly in the inner rings of the main sleeve, the inner rings of the auxiliary sleeves can tightly hold the steel bars, and then the steel bar ends are tightly connected in the main sleeve, the connection strength between two adjacent steel bars is improved.
Preferably, a blocking piece which forms a blocking with the end of the reinforcing steel bar is arranged at the end part of one end, close to each other, of the auxiliary sleeve, one end of the blocking piece is arranged on the end surface of one end, close to each other, of the auxiliary sleeve, and the other end of the blocking piece extends to the position of the axis of the auxiliary sleeve; the separation blade is provided with a plurality ofly, and a plurality of separation blades evenly set up around the axis of assisting the sleeve to there is the clearance between the one end that the separation blade is close to each other.
Through adopting above-mentioned technical scheme, when the reinforcing bar twists in the auxiliary sleeve, the separation blade can stop reinforcing bar end department and stretch out auxiliary sleeve, and the length that makes two reinforcing bar ends stretch into main sleeve part is difficult for having too big deviation to make two auxiliary sleeves can be more even through the joint strength between bloated tight mode and the main sleeve, and then make two reinforcing bars firmly link together.
Preferably, the one end that self and auxiliary sleeve junction are kept away from to the separation blade inclines to the position slope extension at another auxiliary sleeve place to when the separation blade on two auxiliary sleeves was each other supported, the one end that self and auxiliary sleeve junction were kept away from to the orientation of keeping away from each other of separation blade was buckled.
Through adopting above-mentioned technical scheme, because of the state that sets up of separation blade, when will assist the sleeve to twist in the main sleeve and make the mutual butt of separation blade on two assistance sleeves, if the separation blade does not take place deformation, then the one end that the assistance sleeve kept away from each other is outside the main sleeve, continue to twist after that and move the assistance sleeve and make the assistance sleeve to move to main sleeve middle part position, then the separation blade is kept away from self and is assisted the one end of muffjoint department and can be buckled to the direction of keeping away from each other, thereby make two assistance sleeves can receive the power of keeping away from each other and being on a parallel with self axis direction, so the screw thread of assistance sleeve outer lane can be supported tightly in the screw thread of main sleeve inner circle by the axial, then follow-up reinforcing bar end threaded connection is in assisting the sleeve after, joint strength between assistance sleeve and the main sleeve can obtain further promotion, help promoting the connection stability between two reinforcing bars.
Preferably, the direction of the internal thread at one end of the main sleeve is the same as the direction of the external thread on the end of the corresponding connected steel bar.
Through adopting above-mentioned technical scheme, when rotating the main sleeve and making the reinforcing bar end screw in the auxiliary sleeve gradually, the same screw thread direction can be at the reinforcing bar end screw in auxiliary sleeve's in-process, and auxiliary sleeve is difficult for being twisted out from the main sleeve gradually to make the connection between main sleeve and the reinforcing bar more firm.
Preferably, a lug is arranged at one end of the auxiliary sleeve, which is far away from the auxiliary sleeve; and a clamping groove matched with the bump is arranged in the inner ring at the end part of the main sleeve, and the inner wall of one side of the clamping groove, which is close to the port part of the main sleeve, is communicated with the outside.
Through adopting above-mentioned technical scheme, under the cooperation of lug and draw-in groove, the reinforcing bar end twists the in-process of assisting the sleeve, and it is difficult for in main telescopic inner circle to assist the sleeve to rotate, makes the internal thread that makes assisting telescopic external screw thread and main sleeve inner circle be difficult for taking place wearing and tearing to make assisting sleeve and main sleeve be difficult for appearing taking off the silk phenomenon.
Preferably, the surface of one side of the lug, which is close to the inner ring of the main sleeve, is in a step shape, and the shape of the inside of the clamping groove is matched with the lug.
Through adopting above-mentioned technical scheme, on the one hand for area of contact between lug and the draw-in groove increases, thereby can promote the connection compactness between supplementary sleeve and the main sleeve, and on the other hand makes supplementary sleeve and main sleeve be difficult for appearing taking off a phenomenon more, helps promoting the joint strength between two reinforcing bars.
Preferably, the outer wall of the main sleeve is provided with a mounting groove for concrete to flow into.
Through adopting above-mentioned technical scheme, the reinforcing bar that the installation is good is when concreting, and the concrete can flow in the mounting groove, makes the area of contact increase between main sleeve and the concrete to can promote building structure's intensity.
Preferably, the mounting groove extends around the outer surface of the main sleeve in a stepped bending manner.
Through adopting above-mentioned technical scheme, on the one hand for main sleeve week side surface is more even with the joint strength of concrete, thereby can promote the joint strength between whole reinforcing bar and the concrete, and on the other hand can be with the department of buckling of one of them one end embedding mounting groove stair structure of L shape spanner, then just can exert the turning force to main sleeve through L shape spanner, thereby the operator is convenient for rotate main sleeve, helps promoting the efficiency of construction.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the arrangement that the main sleeve and the auxiliary sleeve inner ring are in the shape of the conical surface, in the process that the ends of the reinforcing steel bars are gradually screwed in from the end with the larger cross-sectional area of the auxiliary sleeve inner ring, the outer ring of the auxiliary sleeve can be gradually expanded, and the auxiliary sleeve inner ring can tightly hold the ends of the reinforcing steel bars, so that the ends of the reinforcing steel bars are tightly connected in the main sleeve, and the connection strength between two adjacent reinforcing steel bars is improved;
2. due to the arrangement of the blocking pieces, the lengths of the two reinforcing steel bar ends extending into the main sleeve are not prone to overlarge deviation, so that the connection strength between the two auxiliary sleeves and the main sleeve can be more uniform through an expansion mode, and the two reinforcing steel bars can be firmly connected together;
3. through the setting of lug and draw-in groove, the reinforcing bar end twists the in-process of assisting the sleeve, and it is difficult for continuing to rotate in main telescopic inner circle to assist the sleeve, makes the difficult emergence wearing and tearing of the internal thread that makes assisting telescopic external screw thread and main sleeve inner circle to make and assist sleeve and main sleeve difficult appearance and take off the silk phenomenon.
Drawings
FIG. 1 is an exploded view of a mechanical muff coupling in an embodiment of the application.
Fig. 2 is a sectional structural view of a mechanical muff coupling in the embodiment of the present application.
Description of reference numerals: 1. reinforcing steel bars; 2. a main sleeve; 3. an auxiliary sleeve; 4. a baffle plate; 5. a bump; 6. a card slot; 7. and (4) mounting the groove.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a mechanical sleeve joint who is suitable for high-strength steel bar. Referring to fig. 1 and 2, the mechanical sleeve joint includes a main sleeve 2 for connecting two reinforcing bars 1 together and auxiliary sleeves 3 respectively connected to the two reinforcing bars 1, specifically, the main sleeve 2 is in a hollow circular tube shape, and inner rings at two ends of the main sleeve 2 are respectively provided with inner threads in opposite directions; the auxiliary sleeve 3 is also in the shape of a hollow round tube, and the two auxiliary sleeves 3 are respectively in threaded connection with the inner rings at two ends of the main sleeve 2, and in this embodiment, when the auxiliary sleeve 3 is not subjected to an external force, the auxiliary sleeve 3 and the main sleeve 2 are in a relatively loose threaded connection state, and the auxiliary sleeve 3 needs to be made of a material with deformation capability.
Referring to fig. 1 and 2, the inner ring of the auxiliary sleeve 3 is in a conical surface shape, and the inner ring sectional area of the auxiliary sleeve 3 close to one end is smaller than the inner ring sectional area of one end away from each other, in this embodiment, 1 end of the steel bar is screwed into the inner ring of the auxiliary sleeve 3, the external thread on the end of the steel bar 1 is the same as the external thread on the auxiliary sleeve 3, and the internal diameter of one end away from each other of the auxiliary sleeve 3 is consistent with the external diameter on the end of the steel bar 1, so that the end of the steel bar 1 can be screwed into the auxiliary sleeve 3.
Referring to fig. 1 and 2, when the main sleeve 2 is rotated, the two reinforcing bars 1 are gradually screwed into the auxiliary sleeve 3 and move towards the direction close to each other, in the process, the outer ring of the auxiliary sleeve 3 gradually expands outwards, when the end face of one end of the reinforcing bars 1 close to each other reaches the end face of one end of the auxiliary sleeve 3 close to each other, the auxiliary sleeve 3 expands tightly in the main sleeve 2, and the end of the reinforcing bar 1 is tightly embraced by the inner ring of the auxiliary sleeve 3, so that the two reinforcing bars 1 are connected together under the matching of the main sleeve 2 and the auxiliary sleeve 3.
Referring to fig. 1 and 2, assist sleeve 3 and be close to integrative being fixed with separation blade 4 on the terminal surface of one end each other, it is concrete, separation blade 4 one end is fixed on assisting sleeve 3 and being close to the terminal surface of one end each other, the other end extends to the position at auxiliary sleeve 3 axis place, and can extend to the slope of another auxiliary sleeve 3 place position, in this embodiment, separation blade 4 is provided with a plurality ofly, a plurality of separation blades 4 evenly set up around auxiliary sleeve 3's axis, and separation blade 4 is close to one end each other and has the interval, so that separation blade 4 is difficult for interfering the deformation of assisting sleeve 3.
Referring to fig. 1 and 2, in this embodiment, before the end of the steel bar 1 is not screwed into the auxiliary sleeve 3, the two auxiliary sleeves 3 are screwed into the main sleeve 2 first, and the blocking pieces 4 on the two auxiliary sleeves 3 are abutted against each other, if the blocking pieces 4 are not deformed, the end of the two auxiliary sleeves 3 which is far away from each other will be outside the main sleeve 2, and then the auxiliary sleeves 3 are screwed, in the process, the stopping sheet 4 is bent away from the connection part of the stopping sheet and the auxiliary sleeve 3 to the direction away from each other, so that the auxiliary sleeve 3 is subjected to the force away from each other and parallel to the axis direction of the auxiliary sleeve, therefore, the thread of the outer ring of the auxiliary sleeve 3 can be axially pressed in the thread of the inner ring of the main sleeve 2, after the end of the subsequent steel bar 1 is in threaded connection in the auxiliary sleeve 3, the connection strength between the auxiliary sleeve 3 and the main sleeve 2 can be further improved, and the connection stability between the two steel bars 1 can be improved.
Referring to fig. 1 and 2, one of keeping away from each other of auxiliary sleeve 3 serves an organic whole and is fixed with lug 5, and lug 5 is close to one side surface of 2 inner circles of main sleeve and is the ladder shape, in this embodiment, draw-in groove 6 with lug 5 looks adaptation is seted up to an organic whole in the inner circle of 2 tip departments of main sleeve, and draw-in groove 6 is linked together with the outside near one side inner wall of 2 port departments of main sleeve, then when will assist sleeve 3 and twist into main sleeve 2, lug 5 just can be in draw-in groove 6, then at the in-process of twisting auxiliary sleeve 3 with reinforcing bar 1, auxiliary sleeve 3 is difficult to rotate in the inner circle of main sleeve 2 because of the influence of reinforcing bar 1, thereby make the external screw thread of auxiliary sleeve 3 and the internal screw thread of main sleeve 2 difficult wearing and tearing, and then make auxiliary sleeve 3 and main sleeve 2 difficult the phenomenon of taking off the silk of appearing.
Referring to fig. 1 and 2, an installation groove 7 is formed on the circumferential side surface of the main sleeve 2, specifically, the installation groove 7 extends along the circumferential side surface of the main sleeve 2 along the axis of the main sleeve 2, and the installation groove 7 extends in a stepped bending manner, so that on one hand, after subsequent concrete is poured, the concrete flows into the installation groove 7, thereby improving the connection strength between the main sleeve 2 and the concrete, and on the other hand, one end of the L-shaped wrench can be embedded into the stepped bending part of the installation groove 7, and then, a rotational force can be better applied to the main sleeve 2 through the L-shaped wrench, thereby more quickly connecting the steel bars 1 together and facilitating the improvement of the construction efficiency.
The implementation principle of the mechanical sleeve joint suitable for the high-strength steel bar is as follows: when will connecting two adjacent reinforcing bars 1 together, twist the inner circle at 2 both ends of main sleeve respectively with two auxiliary sleeve 3 earlier, treat that lug 5 is in when draw-in groove 6, auxiliary sleeve 3 just finishes the installation, support two reinforcing bars 1 respectively after that on the one end of keeping away from each other at two auxiliary sleeve 3, then rotate main sleeve 2, then two reinforcing bars 1 can twist gradually in the auxiliary sleeve 3, treat that two reinforcing bars 1 are close to one end each other and support when receiving separation blade 4, the inflation can take place for the outer lane of auxiliary sleeve 3, and can expand tightly in the inner circle of main sleeve 2, thereby just accomplished the connection between two adjacent reinforcing bars 1.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A mechanical sleeve joint suitable for high-strength steel bars comprises two steel bars (1) and a main sleeve (2) used for connecting one ends, close to each other, of the two steel bars (1), wherein external threads are respectively arranged at one ends, close to each other, of the two steel bars (1), and the directions of the two external threads are opposite; the inner rings at the two ends of the main sleeve (2) are respectively provided with internal threads with opposite directions, and the main sleeve is characterized in that: the auxiliary sleeve (3) is connected with the end of the steel bar (1), the auxiliary sleeve (3) is in threaded connection with the end of the steel bar (1), and an external thread matched with the internal thread of the main sleeve (2) is arranged on the outer wall of the auxiliary sleeve (3); the inner ring of the auxiliary sleeve (3) is in a conical shape, the end with the smaller sectional area is positioned at the position where the auxiliary sleeves (3) are close to each other, and the inner diameter of the end with the larger sectional area is equal to the outer diameter of the end of the steel bar (1); when the auxiliary sleeve (3) is connected with the end of the steel bar (1), the outer wall of the auxiliary sleeve (3) expands towards the inner wall of the main sleeve (2).
2. The mechanical muffjoint for high-strength steel bars according to claim 1, wherein: a blocking piece (4) forming a blocking piece with the end of the reinforcing steel bar (1) is arranged on the end part of one end, close to each other, of the auxiliary sleeve (3), one end of the blocking piece (4) is arranged on the end surface of one end, close to each other, of the auxiliary sleeve (3), and the other end of the blocking piece extends to the position where the axis of the auxiliary sleeve (3) is located; the blocking pieces (4) are arranged in a plurality of numbers, the blocking pieces (4) are uniformly arranged around the axis of the auxiliary sleeve (3), and a gap is reserved between the ends, close to each other, of the blocking pieces (4).
3. The mechanical muffjoint for high-strength steel bars according to claim 2, wherein: one end of the separation blade (4) far away from the connection position of the separation blade and the auxiliary sleeve (3) extends towards the position of the other auxiliary sleeve (3) in an inclined mode, and when the separation blades (4) on the two auxiliary sleeves (3) are mutually abutted, one end of the separation blade (4) far away from the connection position of the separation blade and the auxiliary sleeve (3) is bent towards the direction of mutual far away.
4. The mechanical muffjoint for high-strength steel bars according to claim 1, wherein: the direction of the internal thread at one end of the main sleeve (2) is the same as the direction of the external thread on the end of the corresponding connected steel bar (1).
5. The mechanical muffjoint for high-strength steel bars according to claim 1, wherein: a lug (5) is arranged at one end of the auxiliary sleeve (3) which is far away from each other; a clamping groove (6) matched with the bump (5) is arranged in the inner ring at the end of the main sleeve (2), and the inner wall of one side, close to the port of the main sleeve (2), of the clamping groove (6) is communicated with the outside.
6. The mechanical muffjoint for high-strength steel bars according to claim 5, wherein: the surface of one side, close to the inner ring of the main sleeve (2), of the convex block (5) is in a step shape, and the shape of the inner part of the clamping groove (6) is matched with that of the convex block (5).
7. The mechanical muffjoint for high-strength steel bars according to claim 1, wherein: and an installation groove (7) for concrete to flow into is arranged on the outer wall of the main sleeve (2).
8. The mechanical muffjoint for high-strength steel bars according to claim 7, wherein: the mounting groove (7) extends around the outer surface of the main sleeve (2) in a stepped bending manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120903658.9U CN216276479U (en) | 2021-04-28 | 2021-04-28 | Mechanical sleeve joint suitable for high-strength steel bars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120903658.9U CN216276479U (en) | 2021-04-28 | 2021-04-28 | Mechanical sleeve joint suitable for high-strength steel bars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216276479U true CN216276479U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120903658.9U Expired - Fee Related CN216276479U (en) | 2021-04-28 | 2021-04-28 | Mechanical sleeve joint suitable for high-strength steel bars |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216276479U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753512A (en) * | 2022-06-02 | 2022-07-15 | 郑州大学综合设计研究院有限公司 | Connecting device for assembling building components |
| CN115679812A (en) * | 2022-11-03 | 2023-02-03 | 中铁大桥勘测设计院集团有限公司 | Main tower vertical steel bar sectional type reinforcing structure and construction method thereof |
-
2021
- 2021-04-28 CN CN202120903658.9U patent/CN216276479U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753512A (en) * | 2022-06-02 | 2022-07-15 | 郑州大学综合设计研究院有限公司 | Connecting device for assembling building components |
| CN115679812A (en) * | 2022-11-03 | 2023-02-03 | 中铁大桥勘测设计院集团有限公司 | Main tower vertical steel bar sectional type reinforcing structure and construction method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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