CN209891234U - Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation - Google Patents
Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation Download PDFInfo
- Publication number
- CN209891234U CN209891234U CN201920158596.6U CN201920158596U CN209891234U CN 209891234 U CN209891234 U CN 209891234U CN 201920158596 U CN201920158596 U CN 201920158596U CN 209891234 U CN209891234 U CN 209891234U
- Authority
- CN
- China
- Prior art keywords
- steel
- pipe column
- foundation
- embedded
- bolt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Foundations (AREA)
Abstract
The utility model discloses an accurate positioning mechanism of pre-buried rag bolt of steel-pipe column concrete foundation has solved the problem of the accurate location difficulty of pre-buried rag bolt on the steel-pipe column concrete foundation. Including the steel-pipe column, steel-pipe column concrete foundation reinforcement (1) that the annular was arranged, portal frame (2) that the steel pipe was built, pre-buried lower margin bolt (5) and steel sheet holding ring (3), make steel sheet holding ring (3) of a simulation steel-pipe column ring flange, process out the bolt hole identical completely with the bolt hole on the steel-pipe column ring flange on steel sheet holding ring (3), cross-under pre-buried lower margin bolt on steel sheet holding ring (3), support the location to the holding ring that has cross-under pre-buried lower margin bolt through the steel pipe support, and be in the same place its template reinforcing bar fixed connection in with the steel-pipe column concrete foundation, pour the foundation concrete, after pouring the foundation concrete solidification, tear the holding ring down. Accurate positioning and embedding of the embedded anchor bolts are achieved.
Description
Technical Field
The invention relates to a steel pipe column concrete foundation, in particular to an accurate positioning mechanism and a positioning method for pre-buried foundation bolts which are connected and fixed with a flange plate at the bottom end of a steel pipe column on the steel pipe column concrete foundation.
Background
The steel pipe column foundation is generally a cast-in-place concrete foundation, foundation bolts are required to be embedded in a foundation slab, and the steel pipe column is connected with the embedded foundation bolts through a connecting flange arranged at the bottom of the steel pipe column so as to complete the fixation of the steel pipe column; whether the embedding of foundation bolt can accurate location, direct relation to subsequent smooth installation of steel-pipe column, promptly, when the steel-pipe column falls from high altitude hoist and mount, whether the bolt hole on the ring flange of its bottom can embolia smoothly on the embedded foundation bolt. The existing positioning method for embedding the foundation bolt before concrete pouring comprises the following steps: according to the positions of bolt holes in a flange plate at the bottom of the steel pipe column, accurately positioning positions of all foundation bolts are measured and marked on template steel bars of a concrete foundation of the steel pipe column, the foundation bolts are bound and fixed on the marked positions, then concrete pouring of the steel pipe column foundation is carried out, and the tail parts of the embedded bolts are exposed to the outside of the top surface of cast-in-place concrete; this positioning method has the following problems: (1) the method comprises the following steps of (1) inevitable measurement errors, (2) easy error in marking operation, and (3) easy displacement of embedded anchor bolts in the pouring of foundation concrete, so that the positioning of the embedded bolts is deviated, the embedded bolts cannot enter bolt holes of a steel pipe column flange plate when the steel pipe column is hoisted and installed, and the embedded bolts are fixed in concrete, so that the position adjustment is very difficult.
Disclosure of Invention
The invention provides a precise positioning mechanism and a precise positioning method for embedded foundation bolts of a steel pipe column concrete foundation, which solve the technical problem that the embedded foundation bolts on the steel pipe column concrete foundation are difficult to precisely position.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the positioning ring for simulating the steel pipe column flange plate is manufactured, bolt holes completely consistent with the bolt holes in the steel pipe column flange plate are processed in the positioning ring, pre-buried foundation bolts are connected on the positioning ring in a penetrating mode, the positioning ring connected with the pre-buried foundation bolts in a penetrating mode is supported and positioned through the steel pipe support, the positioning ring is fixedly connected with steel bars in a steel pipe column foundation template, then foundation concrete is poured, after the pouring foundation concrete is solidified, the positioning ring is detached, the steel pipe column flange plate is truly simulated through the positioning ring, and accurate pre-buried positioning of the pre-buried foundation bolts is achieved.
The utility model provides an accurate positioning mechanism of pre-buried rag bolt of steel-pipe column concrete foundation, including the steel-pipe column, the steel-pipe column concrete foundation reinforcing bar that the annular was arranged, the portal frame that the steel pipe was built, pre-buried rag bolt and steel sheet holding ring, the bottom mounting at the steel-pipe column is provided with the fixed connection ring flange, be provided with pre-buried bolt cross-under hole equidistantly on the fixed connection ring flange, the bottom mounting at pre-buried rag bolt is provided with the bottom plate, upper end step is provided with on the upper portion of pre-buried rag bolt, the top of pre-buried rag bolt above the upper end step is provided with the male screw thread, be provided with pre-buried bolt cross-under hole equidistantly on the steel sheet holding ring equidistantly, the shape of steel sheet holding ring is the same completely with the shape of the fixed connection ring flange that the steel-pipe column bottom mounting set up, pre-buried bolt cross-under hole equidistantly that equidistantly set up equidistantly on the steel sheet holding ring flange Fully coincident; the steel pipe column concrete foundation reinforcing steel bar is respectively tied along the same horizontal plane and is provided with annular inner side positioning ribs and annular outer side positioning ribs, a frame reinforcing steel bar is lapped between the annular inner side positioning ribs and the annular outer side positioning ribs at equal intervals of radian, a portal frame which is built by steel pipes is erected at equal intervals of radian on the annular steel pipe column concrete foundation reinforcing steel bar, a steel plate positioning ring is lapped on a top cross beam of the portal frame, a bottom supporting plate which is fixedly arranged at the bottom end of an embedded foundation bolt is placed on the frame reinforcing steel bar, and the top end of the embedded foundation bolt penetrates through the embedded bolt which is arranged at the equal intervals of radian on the steel plate positioning ring to be in advance connected with a nut in a screwed mode.
The lower bottom surface of the steel plate positioning ring is lapped on an upper end step arranged at the upper part of the embedded anchor bolt; the portal frame built by the steel pipes erected on the steel pipe column concrete foundation steel bars arranged in the annular shape at equal intervals in radian is radially arranged by taking the central axis of the steel pipe column concrete foundation steel bars arranged in the annular shape as the center.
The accurate positioning method for the embedded foundation bolt of the steel pipe column concrete foundation comprises the following steps:
the method comprises the following steps that firstly, a steel plate positioning ring is manufactured, pre-embedded bolt pre-penetration holes are processed in the steel plate positioning ring, the shape of the steel plate positioning ring is completely the same as that of a fixed connecting flange plate fixedly arranged at the bottom end of a steel pipe column, and the pre-embedded bolt pre-penetration holes arranged at equal intervals in radian are completely overlapped with pre-embedded bolt penetration holes arranged at equal intervals in the fixed connecting flange plate; manufacturing a portal frame by using a steel pipe;
secondly, determining binding elevations of the annular inner side positioning rib and the annular outer side positioning rib according to the elevation of the steel pipe column to be installed and the height of the embedded anchor bolt, and binding the annular inner side positioning rib and the annular outer side positioning rib on the concrete foundation steel bar of the steel pipe column;
thirdly, erecting portal frames at equal intervals in radian on the annularly arranged steel pipe column concrete foundation steel bars, wherein the portal frames are radially arranged by taking the central axis of the annularly arranged steel pipe column concrete foundation steel bars as the center; adjusting the height of each portal frame to ensure that the cross beam of each portal frame is arranged in the installation elevation plane of a fixed connecting flange fixedly arranged at the bottom end of the steel pipe column, welding and fixing a steel plate positioning ring on the cross beam of the portal frame, and ensuring that the central axis of the steel plate positioning ring is superposed with the central axis of the concrete foundation steel bar of the steel pipe column;
fourthly, penetrating the top end of the embedded anchor bolt out of an embedded bolt pre-through hole which is arranged on the steel plate positioning ring at equal intervals in radian from bottom to top, placing a bottom supporting plate fixedly arranged at the bottom end of the embedded anchor bolt on the frame reinforcing bar, and screwing a nut at the top end of the embedded anchor bolt;
fifthly, arranging a concrete pouring template of the steel pipe column concrete foundation on the tower, pouring concrete, and exposing the steel plate positioning ring on the top surface of the concrete foundation;
sixthly, after the concrete to be poured is solidified, removing the nut, and taking down the steel plate positioning ring from the positioned embedded anchor bolt;
and seventhly, hoisting and installing the steel pipe column.
According to the invention, before the steel pipe column foundation is poured, the steel plate positioning ring which truly simulates the steel pipe column flange plate is erected right above the steel pipe column foundation steel bar, the embedded foundation bolts are screwed on the steel plate positioning ring, the bottom ends of the embedded foundation bolts are accurately supported and positioned on the steel pipe column foundation steel bar, then the steel pipe column foundation concrete is poured, the accurate positioning and embedding of the embedded foundation bolts are realized, the installation precision of the foundation bolts is improved, and the installation of the subsequent steel pipe column is time-saving and smooth.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a steel pipe column foundation reinforcement of the present invention;
FIG. 3 is a diagram showing the fitting relationship among the steel pipe column foundation steel bar, the portal frame 2 and the steel plate positioning ring 3 according to the present invention;
fig. 4 is a schematic structural view of the embedded anchor bolt 5 of the present invention;
FIG. 5 is a diagram showing the fitting relationship among the steel plate positioning ring 3, the embedded anchor bolts 5 and the annular positioning ribs according to the present invention;
FIG. 6 is a schematic structural diagram of the steel pipe column foundation after concrete is poured;
fig. 7 is a schematic structural view of the steel pipe column foundation of the present invention after forming.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
an accurate positioning mechanism for embedded foundation bolts of a steel pipe column concrete foundation comprises a steel pipe column, steel pipe column concrete foundation steel bars 1 which are arranged in an annular mode, a portal frame 2 constructed by the steel pipe, embedded foundation bolts 5 and a steel plate positioning ring 3, wherein the portal frame 2 has enough rigidity, strength and stability, a fixed connecting flange is fixedly arranged at the bottom end of the steel pipe column, embedded bolt through holes are arranged on the fixed connecting flange at equal intervals in an arc mode, a bottom supporting plate 8 is fixedly arranged at the bottom end of the embedded foundation bolts 5, an upper end step 9 is arranged at the upper portion of the embedded foundation bolts 5, male threads 10 are arranged at the top end of the embedded foundation bolts 5 above the upper end step 9, embedded bolt pre-through holes 11 are arranged on the steel plate positioning ring 3 at equal intervals in an arc mode, and the shape of the steel plate positioning ring 3 is completely the same as that of the fixed connecting flange plate fixedly arranged at the bottom end of the steel pipe column, the pre-embedded bolt pre-penetration holes 11 arranged on the steel plate positioning ring 3 at equal intervals in radian are completely overlapped with the pre-embedded bolt penetration holes arranged on the fixed connecting flange plate at equal intervals in radian; the steel pipe column concrete foundation reinforcing steel bar 1 is respectively tied and provided with an annular inner side positioning rib 6 and an annular outer side positioning rib 7 along the same horizontal plane, a frame reinforcing steel bar 12 is lapped between the annular inner side positioning rib 6 and the annular outer side positioning rib 7 at equal intervals of radian, a portal frame 2 built by steel pipes is erected on the steel pipe column concrete foundation reinforcing steel bar 1 arranged in an annular mode at equal intervals of radian, a steel plate positioning ring 3 is lapped on a top cross beam of the portal frame 2, a bottom supporting plate 8 fixedly arranged at the bottom end of an embedded foundation bolt 5 is placed on the frame reinforcing steel bar 12, and the top end of the embedded foundation bolt 5 penetrates through an embedded bolt pre-penetrating hole 11 formed in the steel plate positioning ring 3 at equal intervals of radian and then is connected with a nut 4 in a screwed mode.
The lower bottom surface of the steel plate positioning ring 3 is lapped on an upper end step 9 arranged at the upper part of the embedded ground bolt 5; the portal frame 2 constructed by steel pipes erected on the steel pipe column concrete foundation steel bars 1 arranged in the annular shape at equal intervals in radian is radially arranged by taking the central axis of the steel pipe column concrete foundation steel bars 1 arranged in the annular shape as the center.
The accurate positioning method for the embedded foundation bolt of the steel pipe column concrete foundation comprises the following steps:
firstly, a steel plate positioning ring 3 is manufactured, an embedded bolt pre-penetration hole 11 is processed on the steel plate positioning ring 3, the shape of the steel plate positioning ring 3 is completely the same as that of a fixed connecting flange plate fixedly arranged at the bottom end of a steel pipe column, the embedded bolt pre-penetration holes 11 arranged on the steel plate positioning ring 3 at equal intervals in radian are completely superposed with embedded bolt penetration holes arranged on the fixed connecting flange plate at equal intervals in radian, the thickness of the steel plate positioning ring 3 is 10 millimeters, and the diameter of each embedded bolt penetration hole is 1 millimeter larger than the outer diameter of a male thread 10 arranged at the top end of an embedded foundation bolt 5; manufacturing a portal frame 2 by using a steel pipe;
secondly, determining binding elevations of an annular inner side positioning rib 6 and an annular outer side positioning rib 7 according to the elevation of the installed steel pipe column and the height of the embedded foundation bolts 5, and binding the annular inner side positioning rib 6 and the annular outer side positioning rib 7 on the steel pipe column concrete foundation steel bar 1;
thirdly, erecting portal frames 2 on the steel pipe column concrete foundation steel bars 1 which are annularly arranged at equal intervals in a radian manner, wherein the portal frames 2 are radially arranged by taking the central axis of the steel pipe column concrete foundation steel bars 1 which are annularly arranged as the center; adjusting the height of each portal frame 2 to ensure that the cross beam of each portal frame 2 is arranged in the installation elevation plane of a fixed connecting flange fixedly arranged at the bottom end of the steel pipe column, welding and fixing a steel plate positioning ring 3 on the cross beam of the portal frame 2, and ensuring that the central axis of the steel plate positioning ring 3 is superposed with the central axis of the concrete foundation steel bar 1 of the steel pipe column;
fourthly, penetrating the top end of an embedded anchor bolt 5 out of an embedded bolt pre-through hole 11 which is arranged on a steel plate positioning ring 3 at equal intervals in radian from bottom to top, placing a bottom supporting plate 8 fixedly arranged at the bottom end of the embedded anchor bolt 5 on a frame reinforcing bar 12, screwing a nut 4 at the top end of the embedded anchor bolt 5, adjusting the height of the top of the anchor bolt 5 through the tightness of the nut 5, and controlling the top end elevation of the anchor bolt 5 to be consistent through the measurement of a level gauge; under the condition that the bottom of the embedded anchor bolt 5 is ensured not to deviate and sink, the frame reinforcing bar 12 is welded with the bottom supporting plate 8 fixedly arranged at the bottom end of the embedded anchor bolt 5, and then the frame reinforcing bar 12 is respectively welded with the annular inner side positioning bar 6 and the annular outer side positioning bar 7;
fifthly, arranging a concrete pouring template of the steel pipe column concrete foundation on the tower, pouring concrete, and exposing the steel plate positioning ring 3 on the top surface of the concrete foundation; before concrete is poured, a screw and a nut at the upper part of the embedded foundation bolt 5 are coated with solid butter and then wrapped by plastic cloth, and are fastened by an iron wire to protect a screw thread; in concrete pouring, particularly when pumping concrete is adopted for construction, the condition that the embedded anchor bolts 5 are extruded by the concrete to cause the anchor bolts to move is avoided; the concrete pump pipe is prevented from being directly poured against the embedded anchor bolts 5, and manual pouring concrete distribution is adopted within the range of 300 mm around the embedded anchor bolts 5 as far as possible; when the vibrating spear is used, the vibrating over-frequency is not carried out within the range of 300 mm around the embedded anchor bolt 5; when concrete is poured, constructors need to monitor the positions of the embedded anchor bolts 5, the positions of all groups of the embedded anchor bolts 5 are rechecked at any time by using a level gauge and a theodolite, and once deviation is found, correction is carried out immediately;
sixthly, after the concrete to be poured is solidified, the nut 4 is removed, and the steel plate positioning ring 3 is taken down from the positioned embedded anchor bolt 5;
and seventhly, hoisting and installing the steel pipe column.
Claims (2)
1. An accurate positioning mechanism for embedded foundation bolts of a steel pipe column concrete foundation comprises a steel pipe column, steel pipe column concrete foundation steel bars (1) which are arranged in an annular mode, a portal frame (2) which is built by steel pipes, embedded foundation bolts (5) and steel plate positioning rings (3), wherein a fixed connecting flange is fixedly arranged at the bottom end of the steel pipe column, embedded bolt through holes are formed in the fixed connecting flange at equal intervals in an arc manner, a bottom supporting plate (8) is fixedly arranged at the bottom end of the embedded foundation bolts (5), an upper end step (9) is arranged at the upper portion of the embedded foundation bolts (5), male threads (10) are arranged at the top end of the embedded foundation bolts (5) above the upper end step (9), and the accurate positioning mechanism is characterized in that the embedded bolt through holes (11) are formed in the steel plate positioning rings (3) at equal intervals in an arc manner in advance, the shape of the steel plate positioning rings (3) is completely identical to that the fixed connecting flange plates are fixedly arranged at the bottom ends, pre-embedded bolt pre-penetration holes (11) arranged at equal intervals in radian on the steel plate positioning ring (3) are completely superposed with pre-embedded bolt penetration holes arranged at equal intervals in radian on the fixed connecting flange plate; the steel pipe column concrete foundation reinforcing steel bar fixing device is characterized in that an annular inner side positioning rib (6) and an annular outer side positioning rib (7) are respectively tied and arranged on a steel pipe column concrete foundation reinforcing steel bar (1) along the same horizontal plane, a frame reinforcing steel bar (12) is lapped between the annular inner side positioning rib (6) and the annular outer side positioning rib (7) at equal intervals of radian, a portal frame (2) built by steel pipes is erected on the steel pipe column concrete foundation reinforcing steel bar (1) arranged in an annular mode at equal intervals of radian, a steel plate positioning ring (3) is lapped on a top cross beam of the portal frame (2), a bottom supporting plate (8) arranged at the bottom end of a pre-buried foundation bolt (5) is placed on the frame reinforcing steel bar (12), and the top end of the pre-buried foundation bolt (5) penetrates through a pre-buried bolt pre-penetrating hole (11) arranged at equal intervals of the steel plate positioning ring (3) and.
2. The accurate positioning mechanism for the embedded anchor bolts of the steel pipe column concrete foundation as claimed in claim 1, wherein the lower bottom surface of the steel plate positioning ring (3) is lapped on an upper end step (9) arranged at the upper part of the embedded anchor bolt (5); the portal frame (2) built by steel pipes erected on the steel pipe column concrete foundation steel bars (1) which are annularly arranged at equal intervals in a radian mode is radially arranged by taking the central axis of the steel pipe column concrete foundation steel bars (1) which are annularly arranged as the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920158596.6U CN209891234U (en) | 2019-01-30 | 2019-01-30 | Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920158596.6U CN209891234U (en) | 2019-01-30 | 2019-01-30 | Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209891234U true CN209891234U (en) | 2020-01-03 |
Family
ID=69016237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920158596.6U Active CN209891234U (en) | 2019-01-30 | 2019-01-30 | Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209891234U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853610A (en) * | 2019-01-30 | 2019-06-07 | 山西三建集团有限公司 | Steel pipe column concrete foundation pre-embedded anchoring bolts precise positioning mechanism and localization method |
| CN112283507A (en) * | 2020-10-20 | 2021-01-29 | 中国建筑第八工程局有限公司 | High-precision pre-embedding installation method for flange of group flow-making pump in special-shaped concrete structure |
| CN114809672A (en) * | 2022-05-06 | 2022-07-29 | 山西三建集团有限公司 | Accurate positioning method for steel beam connection embedded bottom plate of frame structure factory building |
-
2019
- 2019-01-30 CN CN201920158596.6U patent/CN209891234U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853610A (en) * | 2019-01-30 | 2019-06-07 | 山西三建集团有限公司 | Steel pipe column concrete foundation pre-embedded anchoring bolts precise positioning mechanism and localization method |
| CN112283507A (en) * | 2020-10-20 | 2021-01-29 | 中国建筑第八工程局有限公司 | High-precision pre-embedding installation method for flange of group flow-making pump in special-shaped concrete structure |
| CN112283507B (en) * | 2020-10-20 | 2022-03-01 | 中国建筑第八工程局有限公司 | High-precision pre-embedding installation method for flange of group flow-making pump in special-shaped concrete structure |
| CN114809672A (en) * | 2022-05-06 | 2022-07-29 | 山西三建集团有限公司 | Accurate positioning method for steel beam connection embedded bottom plate of frame structure factory building |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209891234U (en) | Accurate positioning mechanism for embedded foundation bolt of steel pipe column concrete foundation | |
| EP2458094A1 (en) | Installing method for anchor cage and installing method for industrial equipment | |
| JP4850151B2 (en) | Hybrid tower for wind power generation and its construction method | |
| JP2011236731A (en) | Apparatus and method for producing concrete foundation | |
| CN109853610A (en) | Steel pipe column concrete foundation pre-embedded anchoring bolts precise positioning mechanism and localization method | |
| CN101736698B (en) | Accurate positioning method for cable-stayed bridge pylon cable guide pipe | |
| CN107806205B (en) | Mounting structure and mounting method of lining-free steel dome | |
| CN203247603U (en) | High-position foundation bolt positioning device | |
| CN204001428U (en) | A kind of Large-diameter Steel tubing string suspension column is installed pre-buried location structure and suspension column structure thereof | |
| CN212104166U (en) | Accurate positioning device for embedded bolt of safety injection box of nuclear power station | |
| JP6595404B2 (en) | Steel tower foundation concrete form and steel tower foundation concrete construction method | |
| CN107246026B (en) | Tower equipment foundation bolt embedding construction mold and embedding method thereof | |
| CN201560398U (en) | Inner steel mould for accurately positioning tower column cable sleeves of cable-stayed bridge | |
| CN204001429U (en) | A kind of Large-diameter Steel tubing string suspension column structure and suspension column absolute altitude adjustment fixing structure thereof | |
| KR101632006B1 (en) | Installation method of equipment and anchor member supporting mechanism and anchor bolt unit | |
| CN115613694A (en) | Method for installing and positioning foundation bolts | |
| JP6654918B2 (en) | Fixing method and joint structure of joint steel frame in composite structure | |
| CN105821770B (en) | Connecting and locating method for multiple tower roots and large-size concrete bearing platform foundation of steel structure main tower | |
| CN107059913A (en) | A kind of reactor built-in fitting supporting construction and method for embedding | |
| CN105735138A (en) | Construction method for steel-concrete joint section of bridge | |
| CN111021252A (en) | Construction method of bent cap core rod penetrating hanging rack formwork supporting system | |
| KR20210068958A (en) | Basic column rod fixing system for pricast concrete column | |
| CN218715103U (en) | Girder steel anchor mounting structure encorbelments | |
| CN220225407U (en) | Municipal works foundation construction is with built-in fitting positioner | |
| CN113216591B (en) | Climbing formwork climbing auxiliary steel structure and construction method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |