CN109853754B - Connecting structure of reinforced concrete beam longitudinal ribs and steel columns and construction method thereof - Google Patents
Connecting structure of reinforced concrete beam longitudinal ribs and steel columns and construction method thereof Download PDFInfo
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- CN109853754B CN109853754B CN201910189400.4A CN201910189400A CN109853754B CN 109853754 B CN109853754 B CN 109853754B CN 201910189400 A CN201910189400 A CN 201910189400A CN 109853754 B CN109853754 B CN 109853754B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 42
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 14
- 239000011440 grout Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a connecting structure of a reinforced concrete beam longitudinal rib and a steel column and a construction method thereof, and relates to the technical field of constructional engineering. The method is used for solving the problems that in the prior art, the connection construction difficulty of the longitudinal beam and the steel column is high, and potential safety hazards are easy to exist. The invention discloses a connecting structure of a reinforced concrete beam longitudinal rib and a profile steel column, which comprises a first connecting piece, a second connecting piece and a fixing structure, wherein the first connecting piece is fixed on one radial side of the profile steel column, the second connecting piece is fixed at one end of the beam longitudinal rib, the second connecting piece can be rotatably connected with the first connecting piece, and the fixing structure is used for fixing the second connecting piece on the first connecting piece.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a connecting structure of a reinforced concrete beam longitudinal rib and a steel column and a construction method thereof.
Background
In the building construction process, the beam longitudinal bars in the reinforced concrete are required to be connected with the steel columns.
In the prior art, the connection mode of beam longitudinal ribs and steel columns is generally two types: the first is to weld bracket plates on the profiled steel columns and then weld the longitudinal beam ribs on the bracket plates. And the second is to weld a sleeve on the flange of the steel column and then connect one end of the beam longitudinal rib with a screw with the sleeve.
The first connecting mode is adopted, so that the construction space is almost not reserved under the condition that two or more rows of beam longitudinal ribs are required to be arranged, and the construction difficulty is high; the problem can be solved by adopting the second connecting mode, but for the condition of oblique crossing of the longitudinal beam ribs and the flange of the profile steel column, the inclination of the sleeve and the inclination of the longitudinal beam ribs are easy to have errors, so that the longitudinal beam ribs are difficult to align with the sleeve, and the construction difficulty is high.
Disclosure of Invention
The invention provides a connecting structure of a reinforced concrete beam longitudinal rib and a steel column and a construction method thereof, which are used for solving the problems that the connecting construction of the beam longitudinal rib and the steel column is difficult and potential safety hazards are easy to exist in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
In a first aspect, the invention provides a connection structure of a reinforced concrete beam longitudinal rib and a steel column, which comprises a first connecting piece, a second connecting piece and a fixing structure, wherein the first connecting piece is fixed on one radial side of the steel column, the second connecting piece is fixed on one end of the beam longitudinal rib, the second connecting piece can be rotatably connected with the first connecting piece, and the fixing structure is used for fixing the second connecting piece on the first connecting piece.
Optionally, a mounting groove is formed in the first connecting piece, and the volume of the second connecting piece is smaller than that of the mounting groove.
Optionally, the fixing structure is a grouting material layer, and the grouting material layer is located between the mounting groove and the second connecting piece, and/or the grouting material layer is located between the mounting groove and the beam longitudinal rib.
Optionally, the mounting groove is of a strip-shaped structure.
Optionally, the second connecting piece is a connecting plate, and the first connecting piece is a C-shaped channel steel matched with the connecting plate.
Optionally, the notch width W of the first connecting piece satisfies: w=d+2mm; wherein D is the maximum diameter of a plurality of said beam longitudinal ribs connected to the respective said first connectors.
Optionally, the second connecting piece is welded on the beam longitudinal rib.
Optionally, the second connecting piece is connected with the beam longitudinal bar through bolts.
Optionally, the first connecting piece is welded on the profile steel column.
Optionally, at least two first connecting pieces are arranged on the profile steel column, and the at least two first connecting pieces are arranged along the vertical direction.
In a second aspect, an embodiment of the present invention further includes a construction method for a connection structure between a reinforced concrete beam longitudinal rib and a steel column in the above embodiment, including the following steps: the second connecting piece is fixed on the beam longitudinal rib, and the first connecting piece is fixed on one radial side of the profile steel column; the second connecting piece is connected with the first connecting piece, and the installation angle of the second connecting piece is adjusted to be the same as the installation angle of the longitudinal beam rib; the second connecting piece is fixed on the first connecting piece through a fixing structure.
Optionally, the fixing structure is a grouting material layer, and fixing the second connecting piece on the first connecting piece through the fixing structure specifically includes: after the temporary fixing structure is arranged to fix the beam longitudinal ribs, grouting materials are injected into the first connecting piece until the age; and removing the temporary fixing structure.
Compared with the prior art, the connecting structure of the longitudinal rib and the profile steel column of the reinforced concrete beam and the construction method thereof provided by the invention have the advantages that the second connecting piece at one end of the longitudinal rib of the beam is rotatably connected with the first connecting piece at one radial side of the profile steel column, after the first connecting piece is connected with the second connecting piece, the second connecting piece can be rotated according to the included angle between the longitudinal rib of the beam and the profile steel column, so that the included angle between the second connecting piece and the first connecting piece is the same as the included angle between the longitudinal rib of the beam and the profile steel column, and then the second connecting piece is fixed on the first connecting piece through the fixing structure. Therefore, no matter the beam longitudinal ribs are obliquely or vertically intersected with the steel columns, the installation angle of the second connecting piece can be changed along with the actual installation angle of the beam longitudinal ribs, and the second connecting piece is simply rotated during operation, so that the construction difficulty is lower.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a connection structure between a longitudinal bar and a section steel column of a reinforced concrete beam according to an embodiment of the present invention;
Fig. 2 is a second schematic structural view of a connection structure between a longitudinal bar and a section steel column of a reinforced concrete beam according to an embodiment of the present invention;
Fig. 3 is a schematic structural view of a vertical connection between a beam longitudinal rib and a steel column in a connection structure of a reinforced concrete beam longitudinal rib and a steel column according to an embodiment of the present invention;
fig. 4 is a schematic structural view of oblique connection of a beam longitudinal rib and a steel column in a connection structure of the reinforced concrete beam longitudinal rib and the steel column according to an embodiment of the present invention;
Fig. 5 is a schematic cross-sectional view of a first connecting member in the connecting structure of the longitudinal bar and the steel column of the reinforced concrete beam according to the embodiment of the present invention;
Fig. 6 is a schematic structural view of welding a beam longitudinal rib and a second connecting piece in a connecting structure of a reinforced concrete beam longitudinal rib and a steel column according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a connection structure of a beam longitudinal rib and a second connecting piece in the connection structure of a reinforced concrete beam longitudinal rib and a steel column according to the embodiment of the invention;
fig. 8 is a schematic flow chart of a construction method for a connection structure of a reinforced concrete beam longitudinal bar and a steel column according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Referring to fig. 1 to 4, the connection structure of the reinforced concrete middle beam longitudinal bar 200 and the steel column 100 according to the embodiment of the present invention includes a first connection member 1, a second connection member 2, and a fixing structure 3, wherein the first connection member 1 is fixed on one radial side of the steel column 100, the second connection member 2 is fixed on one end of the beam longitudinal bar 200, the second connection member 2 is rotatably connected with the first connection member 1, and the fixing structure 3 is used for fixing the second connection member 2 on the first connection member 1.
Compared with the prior art, the connecting structure of the reinforced concrete beam longitudinal rib 200 and the steel column 100 provided by the invention has the advantages that the second connecting piece 2 at one end of the beam longitudinal rib 200 is rotatably connected with the first connecting piece 1 at one radial side of the steel column 100, after the first connecting piece 1 is connected with the second connecting piece 2, the second connecting piece 2 can be rotated according to the included angle between the beam longitudinal rib 200 and the steel column 100, so that the included angle between the second connecting piece 2 and the first connecting piece 1 is the same as the included angle between the beam longitudinal rib 200 and the steel column 100, and then the second connecting piece 2 is fixed on the first connecting piece 1 through the fixing structure 3. Therefore, no matter the beam longitudinal ribs 200 are obliquely or vertically intersected with the steel column 100, the installation angle of the second connecting piece 2 can be changed along with the actual installation angle of the beam longitudinal ribs 200, and the second connecting piece 2 is simply rotated during operation, so that the construction difficulty is lower.
Optionally, the first connector 1 and the second connector 2 are hinged; or the first connecting piece 1 is internally provided with the mounting groove 11, the volume of the second connecting piece 2 is smaller than the volume of the mounting groove 11, namely, the second connecting piece 2 is in clearance fit with the mounting groove 11, and the second connecting piece 2 can rotate in the mounting groove 11 so as to adjust the mounting angle of the second connecting piece 2 in the mounting groove 11.
Optionally, in some embodiments, the first connector 1 and the second connector 2 are fixed by a plurality of bayonet connections. In other embodiments, the fixing structure 3 is a grouting material layer, which is located between the mounting groove 11 and the second connecting piece 2, or between the mounting groove 11 and the beam longitudinal rib 200, or between the mounting groove 11 and the second connecting piece 2, but also between the mounting groove 11 and the beam longitudinal rib 200. Compared with the mode of fixing the second connecting piece 2 and the first connecting piece 1 through a plurality of bayonets, the number of bayonets is limited, the angle of the second connecting piece 2 can be adjusted only in a limited plurality of ranges, and the angle of the second connecting piece 2 can be adjusted at will, so that the angle adjusting range of the second connecting piece 2 is wider. Therefore, the latter solution is preferably adopted in the embodiments of the present invention. Specifically, the grouting material layer is a slurry layer with the performances of specified fluidity, early strength, high strength, micro expansion after hardening and the like.
It should be noted that: the mounting groove 11 may have various shapes, such as arc shape and C shape, and the mounting groove 11 is provided with a notch 111 matching with the longitudinal beam rib 200, so that the grouting material can be directly injected into the mounting groove 11. In addition, the width W of the notch 111 is larger than the maximum diameter D of the plurality of beam longitudinal ribs 200, that is, the notch 111 is in clearance fit with the beam longitudinal ribs 200, so that the second connecting piece 2 can rotate relative to the first connecting piece 1.
Further, the mounting groove 11 is of a strip-shaped structure, that is, the mounting groove 11 is an adjusting groove, and the second connecting piece 2 can move along the extending direction of the mounting groove 11, so that the distance between two adjacent beam longitudinal ribs 200 can be adjusted, and the operation is simple and the adjustment is convenient.
It should be noted that: the shape of the second connector 2 may be the same as or different from the shape of the mounting groove 11.
Optionally, the second connecting piece 2 may be a connecting plate, correspondingly, the first connecting piece 1 is a C-shaped channel steel matched with the connecting plate, so that the upper and lower side walls of the connecting plate are convenient to be matched with wing plates of the channel steel, and the first connecting piece 1 and the second connecting piece 2 are common structural members, so that the processing is convenient; alternatively, the second connecting piece 2 may be a circular arc connecting piece, and correspondingly, the first connecting piece 1 is a square guide rail, and a mounting groove 11 with a circular arc cross section is formed on one side of the square guide rail away from the profile steel column 100, and when the second connecting piece 2 rotates in the mounting groove 11, the second connecting piece 2 is not easy to be blocked. In addition, the second connecting piece 2 can also be made of steel materials, and the steel materials adopted by the first connecting piece 1 and the second connecting piece 2 can be the same or different, so long as the steel materials have enough strength and rigidity, and the connection parts of the first connecting piece 1, the second connecting piece 2 and the components can be ensured not to be damaged when the stress of the beam longitudinal rib 200 reaches the design strength.
Referring to fig. 5, if the width W of the notch 111 of the first connector 1 is too small, the orientation adjustment and movement of the second connector 2 are not facilitated; if the width W of the notch 111 of the first connector 1 is too large, the structural strength and rigidity of the first connector 1 are low. Therefore, the width W of the notch 111 of the first connector 1 in the embodiment of the present invention satisfies: w=d+2mm; where D is the maximum diameter of the plurality of beam longitudinal ribs 200 (i.e., the same row of beam longitudinal ribs 200) connected to the corresponding first connector 1.
Further, the second connecting member 2 is connected to the longitudinal beam 200 in various manners. For example, in some embodiments, the second connecting piece 2 is welded to the beam longitudinal rib 200, as shown in fig. 6, and has high connection strength and good connection performance; in other embodiments, the second connecting piece 2 is connected with the beam longitudinal rib 200 by bolts, as shown in fig. 7, so that the installation is convenient, and the connection strength is high.
Accordingly, the first connecting member 1 and the steel column 100 can be connected in various manners. For example, in some embodiments, the first connector 1 is welded to the steel column 100; in other embodiments, the first connector 1 is bolted to the steel column 100. Because the bolt connection needs to be provided with a matching hole on the steel column 100 to affect the structural strength of the steel column 100, the first connecting piece 1 is welded on the steel column 100 in the embodiment of the invention.
Alternatively, only one row of beam longitudinal ribs 200 may be provided on the steel column 100. Therefore, the profile steel column 100 is provided with a first connecting piece 1, each beam longitudinal rib 200 is provided with a first connecting piece 1, and the first connecting piece 1 can be connected with the whole row of beam longitudinal ribs 200 through the second connecting piece 2. In order to adapt to the situation that multiple rows of beam longitudinal ribs 200 need to be fixed on the steel column 100, further, two or more first connecting pieces 1 are arranged on the steel column 100 in the embodiment of the invention, the first connecting pieces 1 are arranged along the vertical direction, and each first connecting piece 1 can be connected with two or more second connecting pieces 2.
The section steel column 100 can be I-steel, cross steel and rectangular steel, the bearing capacity of the section steel concrete column is more than one time higher than that of the reinforced concrete column with the same section, the section of the section steel column 100 is reduced, the use area can be increased, and the economic benefit is great; compared with a reinforced concrete structure, the ductility of the steel reinforced concrete column is obviously improved, and the steel reinforced concrete column has good anti-seismic performance; compared with a pure steel column, the steel reinforced concrete column has better durability, fire resistance and the like, and has less steel consumption than the pure steel column. Therefore, in the reinforced concrete structure, the adoption of the steel reinforced concrete column can generate better economic benefit.
Referring to fig. 8, the embodiment of the present invention further includes a construction method for the connection structure of the reinforced concrete beam longitudinal bar 200 and the steel column 100, including the steps of: the second connecting piece 2 is fixed on the beam longitudinal rib 200, and the first connecting piece 1 is fixed on one radial side of the steel column 100; the second connecting piece 2 is connected with the first connecting piece 1, and the installation angle of the second connecting piece 2 is adjusted to be the same as the installation angle of the beam longitudinal rib 200; the second connector 2 is fixed to the first connector 1 by a fixing structure 3. The construction method can change the installation angle of the second connecting piece 2 along with the installation angle of the beam longitudinal rib 200, so that the construction difficulty is reduced. The step of fixing the second connecting piece 2 on the beam longitudinal rib 200 and the step of fixing the first connecting piece 1 on one radial side of the profile steel column 100 can be completed in a factory, and the factory mass production and the processing are convenient and the cost is lower; and the two subsequent steps are completed on the construction site, so that the construction efficiency and the construction quality are improved.
Further, the fixing structure 3 is a grouting material layer, and the fixing the second connecting member 2 to the first connecting member 1 through the fixing structure 3 specifically includes: after the temporary fixing structure fixing beam longitudinal ribs 200 are arranged, grouting materials are injected into the first connecting piece 1 and reach the age; and (5) removing the temporary fixing structure. Then, the next working procedure construction can be carried out, and the age can be 24 hours after grouting is completed.
It should be noted that: after the grouting is completed for 28 days, if the beam longitudinal ribs 200 of the reinforced concrete are pulled, the pulling force can be transferred to the first connecting piece 1 through the second connecting piece 2, and then transferred to the profile steel column 100 through the connecting structure (such as welding seams) of the first connecting piece 1 and the profile steel column 100; if the reinforced concrete beam longitudinal ribs 200 are pressed, the pressure can be transmitted to the first connecting piece 1 through the second connecting piece 2 and the hardened grouting material layer, and then transmitted to the steel column 100 through the connecting structure of the first connecting piece 1 and the steel column 100; if the beam longitudinal bar 200 of the reinforced concrete is subjected to shearing force, the shearing force can be transmitted to the first connecting piece 1 through the notch 111 near one side of the beam longitudinal bar 200, and then transmitted to the steel column 100 through the connecting structure of the first connecting piece 1 and the steel column 100, so that after the beam longitudinal bar 200 and the steel column 100 are connected through the connecting structure, various stress requirements can be met.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. The connecting structure of the reinforced concrete beam longitudinal rib and the steel column is characterized by comprising a first connecting piece, a second connecting piece and a fixing structure, wherein the first connecting piece is fixed on one radial side of the steel column, the second connecting piece is fixed at one end of the beam longitudinal rib, the second connecting piece is rotatably connected with the first connecting piece, and the fixing structure is used for fixing the second connecting piece on the first connecting piece;
A mounting groove is formed in the first connecting piece; the second connecting piece is the connecting plate, the second connecting piece with mounting groove clearance fit connects, just the second connecting piece can rotate in the mounting groove.
2. The connection structure of a reinforced concrete beam longitudinal rib and a section steel column according to claim 1, wherein the fixing structure is a grouting material layer, the grouting material layer is located between the mounting groove and the second connecting piece, and/or the grouting material layer is located between the mounting groove and the beam longitudinal rib.
3. The connection structure of a reinforced concrete beam longitudinal bar and a section steel column according to claim 1, wherein the installation groove is of a long strip structure.
4. The connection structure of a reinforced concrete beam longitudinal bar and a section steel column according to claim 1, wherein the first connection member is a C-shaped channel steel matched with the connection plate.
5. The connection structure of a reinforced concrete beam longitudinal bar and a section steel column according to claim 1 or 4, wherein the notch width W of the first connecting member satisfies: w=d+2mm; wherein D is the maximum diameter of a plurality of said beam longitudinal ribs connected to the respective said first connectors.
6. The connection structure of a reinforced concrete beam longitudinal rib and a steel column according to claim 1, wherein the second connection member is welded to the beam longitudinal rib.
7. The connection structure of a reinforced concrete beam longitudinal bar and a steel column according to claim 1, wherein the second connection member is bolted to the beam longitudinal bar.
8. The connection structure of a reinforced concrete beam longitudinal rib and a section steel column according to claim 1, wherein the first connecting member is welded to the section steel column.
9. The connection structure of a reinforced concrete beam longitudinal rib and a section steel column according to claim 1, wherein at least two first connecting pieces are arranged on the section steel column, and at least two first connecting pieces are arranged in the vertical direction.
10. A construction method for the connection structure of the reinforced concrete beam longitudinal bar and the section steel column according to any one of the preceding claims 1 to 9, characterized by comprising the steps of:
the second connecting piece is fixed on the beam longitudinal rib, and the first connecting piece is fixed on one radial side of the profile steel column;
the second connecting piece is connected with the first connecting piece, and the installation angle of the second connecting piece is adjusted to be the same as the installation angle of the longitudinal beam rib;
the second connecting piece is fixed on the first connecting piece through a fixing structure.
11. The method for constructing a connection structure for reinforced concrete according to claim 10, wherein the fixing structure is a grout layer, and the fixing of the second connection member to the first connection member by the fixing structure specifically comprises:
After the temporary fixing structure is arranged to fix the beam longitudinal ribs, grouting materials are injected into the first connecting piece until the age;
and removing the temporary fixing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910189400.4A CN109853754B (en) | 2019-03-13 | 2019-03-13 | Connecting structure of reinforced concrete beam longitudinal ribs and steel columns and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910189400.4A CN109853754B (en) | 2019-03-13 | 2019-03-13 | Connecting structure of reinforced concrete beam longitudinal ribs and steel columns and construction method thereof |
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| CN109853754A CN109853754A (en) | 2019-06-07 |
| CN109853754B true CN109853754B (en) | 2024-07-19 |
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| CN113482170A (en) * | 2021-07-20 | 2021-10-08 | 上海建工一建集团有限公司 | Construction method of outwards-extending connecting piece of stiff concrete joint |
| CN115596085A (en) * | 2022-11-11 | 2023-01-13 | 海南大学（Cn） | Connecting structure of steel column and reinforced concrete beam and construction method thereof |
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| CN207959495U (en) * | 2018-01-18 | 2018-10-12 | 华东建筑设计研究院有限公司 | A kind of beam column node connection device suitable for prefabricated concrete structure |
| CN209760465U (en) * | 2019-03-13 | 2019-12-10 | 悉地（北京）国际建筑设计顾问有限公司 | Reinforced concrete beam longitudinal bar and profile steel column connecting structure |
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| JP5272923B2 (en) * | 2009-06-26 | 2013-08-28 | 株式会社タニガキ建工 | Earth retaining structure |
| CN103821230A (en) * | 2014-02-27 | 2014-05-28 | 王睿敏 | Reinforced concrete structure connection component, manufacturing method and construction method thereof |
| KR101549782B1 (en) * | 2014-04-01 | 2015-09-07 | 서울시립대학교 산학협력단 | Angle Adjustable Tendon Anchoring Apparatus for external post-tensiong |
| CN105155773B (en) * | 2015-08-18 | 2017-08-25 | 同济大学 | A kind of removable concrete component construction method |
| CN205476091U (en) * | 2015-12-31 | 2016-08-17 | 中冶建筑研究总院有限公司 | Cast in situ concrete is reinforcing bar connecting sleeve that is in milk entirely for structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207959495U (en) * | 2018-01-18 | 2018-10-12 | 华东建筑设计研究院有限公司 | A kind of beam column node connection device suitable for prefabricated concrete structure |
| CN209760465U (en) * | 2019-03-13 | 2019-12-10 | 悉地（北京）国际建筑设计顾问有限公司 | Reinforced concrete beam longitudinal bar and profile steel column connecting structure |
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