CN113653359A - Newly-added beam and existing column joint annular steel plate hoop conversion connection structure - Google Patents
Newly-added beam and existing column joint annular steel plate hoop conversion connection structure Download PDFInfo
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- CN113653359A CN113653359A CN202111110063.9A CN202111110063A CN113653359A CN 113653359 A CN113653359 A CN 113653359A CN 202111110063 A CN202111110063 A CN 202111110063A CN 113653359 A CN113653359 A CN 113653359A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/027—Preventive constructional measures against earthquake damage in existing buildings
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Abstract
The invention discloses a conversion connection structure of a newly added beam and an existing column node annular steel plate hoop, which comprises an existing column, wherein vertical steel plates are arranged around the existing column, the vertical steel plates are fixedly connected with the existing column through mechanical anchor bolts, and adjacent vertical steel plates are connected by single-edge groove partial penetration butt welding seams; the invention is suitable for the technical field of building transformation and reinforcement, and the invention adopts a reasonable node connection mode, effectively improves the force transmission and stress performance of beam column nodes, obviously increases the safety performance and the anti-seismic performance of the nodes, simultaneously has simple and convenient construction, saves the cost, and solves various defects and risks existing in the conventional connection method.
Description
Technical Field
The invention belongs to the technical field of building reconstruction and reinforcement, and particularly relates to a conversion connection structure of a newly added beam and an existing column joint annular steel plate hoop.
Background
Since the development of the eighties of the last century, various house buildings and facilities in ChinaThe number of applications is increasing dramatically and it is statistically estimated that the total area of various existing buildings is at least 100 hundred million m2The above. With the advance of urbanization, the building number of buildings is controlled, the service life of the existing buildings is prolonged, and the use functions of the existing buildings are improved and promoted, so that the building is more and more an important subject in the field of buildings, and unprecedented development opportunities and market spaces are brought to the building reinforcement and repair industry.
Aiming at a newly-added layer which is widely met in reconstruction and reinforcement, two modes of a newly-added reinforced concrete beam slab or a steel beam and a profiled steel sheet are generally adopted, and the connection method of the newly-added beam and an existing concrete column needs to be solved, wherein the method of the newly-added concrete beam is that longitudinal steel bars of the beam are anchored into the column in a bar planting mode, and the method of the newly-added steel beam is that steel plates are fixed on the side surface of the column through mechanical anchor bolts and then the steel beam and the steel plates are hinged through ear plates.
Both of the above two conventional methods have certain disadvantages. According to the requirements of the provisions of GB50367-2013 in the concrete structure reinforcement design Specification, the anchoring of longitudinal reinforcing steel bars of a beam into a column at least reaches more than 25D, and the horizontal spacing of the longitudinal reinforcing steel bars is not less than 5D (D is the diameter of the longitudinal reinforcing steel bars of the beam and is usually 25 mm-22 mm), on one hand, under the influence of concrete stones and the like in the existing column, the straight holes formed within the length range of 600 mm-700 mm are difficult to ensure by adopting the percussion drilling hole, on the other hand, as the number of longitudinal reinforcing steel bars of the beam is more, at least 2 rows or even 3 rows are needed, and the diameter of the drilling hole is generally 7-8mm larger than that of the reinforcing steel bars, the drilling hole can cause serious damage to the concrete between the drilling holes and the section of the whole existing column, especially, when the four sides of the column need to be embedded with the bars, the drilling holes in two directions can cause the situation that the concrete of the existing column is all crisped in the range of the height of the beam. The cost itself such as girder steel connected mode, girder steel and profiled sheet is higher than reinforced concrete, and all steel construction all need remove rust and fire prevention and handle for the cost further increases. In addition to the cost, the steel structure mode has a large influence on the net height because the connection mode of the steel beam belongs to a hinge mode, the height of the steel beam is increased, and the thickness of a profiled steel plate with the thickness of 150mm is also increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a conversion connection structure of an additional beam and an existing column node annular steel plate hoop.
In order to achieve the purpose, the invention adopts the following technical scheme:
the newly-added beam and existing column node annular steel plate hoop conversion connection structure comprises an existing column, wherein vertical steel plates are arranged on the periphery of the existing column, the vertical steel plates are fixedly connected with the existing column through mechanical anchor bolts, and adjacent vertical steel plates are connected through partially-penetrated butt welding seams with single-side grooves;
the vertical steel plate outside is provided with rather than the cyclic annular steel plate hoop of vertically twice, and the cyclic annular steel plate hoop of twice corresponds the position of longitudinal reinforcement about newly-increased roof beam respectively, and cyclic annular steel plate hoop and vertical steel plate adopt fillet weld welding, and longitudinal reinforcement about newly-increased roof beam respectively with upper and lower annular steel plate hoop welding, the welding has a plurality of pegs on the vertical steel plate in newly-increased roof beam cross-sectional range.
Preferably, the number of the mechanical anchor bolts is determined based on shear force of the anchor bolt bearing beam ends.
Preferably, the thickness and the length of the annular steel plate hoop are equal to the tensile bearing capacity of the newly added beam longitudinal steel bar.
Preferably, when the calculated data of the upper longitudinal steel bar or the lower longitudinal steel bar of the newly added beam is larger than 6 phi 25, the exceeding part of the newly added beam bypasses the column edge to form a through longitudinal steel bar, and the corresponding beam section is subjected to armpit processing at the column edge, so that the beam-column connection node forms a splayed structure.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, through setting a reasonable node connection mode, the force transmission and stress performance of the beam-column node is effectively improved, the safety performance and the anti-seismic performance of the node are obviously improved, meanwhile, the construction is simple and convenient, the cost is saved, and various defects and risks existing in the conventional connection method are solved.
Drawings
FIG. 1 is a front view of a conversion connection structure of a newly added beam and an existing column node annular steel plate hoop;
FIG. 2 is a top view of the conversion connection structure of the newly added beam and the existing column node annular steel plate hoop of the present invention;
FIG. 3 is a schematic view of a splayed structure in the conversion connection structure of the newly added beam and the existing column node annular steel plate hoop.
Reference numerals: 1. existing columns; 2. a vertical steel plate; 3. an annular steel plate hoop; 4. newly adding a beam; 5. a mechanical anchor bolt; 6. a stud; 7. longitudinal reinforcing steel bars; 8. adding axillary sections; 9. through the longitudinal reinforcement.
Detailed Description
The following further describes a specific embodiment of the conversion connection structure of the newly added beam and the existing column node annular steel plate hoop with reference to fig. 1-3. The conversion connection structure of the added beam and the existing column node annular steel plate hoop is not limited to the description of the following embodiments.
Example 1:
the embodiment provides a specific implementation mode of a newly-added beam and existing column node annular steel plate hoop conversion connection structure, and as shown in fig. 1-3, the structure comprises an existing column 1, vertical steel plates 2 are arranged around the existing column 1, the vertical steel plates 2 are fixedly connected with the existing column 1 through mechanical anchor bolts 5, and adjacent vertical steel plates 2 are connected through a single-edge groove partial penetration butt weld;
the 2 outsides of vertical steel sheet are provided with rather than the cyclic annular steel sheet hoop 3 of vertically twice, and the cyclic annular steel sheet hoop 3 of twice corresponds the position of longitudinal reinforcement 7 about newly-increased roof beam 4 respectively, and cyclic annular steel sheet hoop 3 adopts fillet weld to weld with vertical steel sheet 2, and the longitudinal reinforcement 7 is welded with upper and lower annular steel sheet hoop 3 respectively about newly-increased roof beam 4, and the welding has a plurality of pegs 6 on the vertical steel sheet 2 of newly-increased roof beam 4 cross-sectional range.
Further, the number of the mechanical anchor bolts 5 is determined based on the shear force of the anchor bolt bearing beam end.
Furthermore, the thickness and the length of the annular steel plate hoop 3 are equal to the tensile bearing capacity of the upper longitudinal steel bar 7 and the lower longitudinal steel bar 7 of the newly added beam 4.
By adopting the technical scheme:
And annular steel plate hoops 3 perpendicular to the vertical steel plates 2 on four sides of the existing column 1 are arranged at positions corresponding to the upper and lower longitudinal reinforcements of the newly added beam 4 (concrete beam), the annular steel plate hoops 3 and the vertical steel plates 2 are welded by adopting angle welding, and the thickness and the length of the annular steel plate hoops 3 are calculated and determined according to the principle of the tensile bearing capacity of the upper and lower longitudinal reinforcements 7 of the beam.
The studs 6 or the short ribs are welded on the vertical steel plates 2 on the four sides of the existing column 1 in the section range of the newly added beam 4 (concrete beam), and friction between the newly added beam 4 and the vertical steel plates 2 is increased, so that the shearing force of the beam end is effectively transmitted.
The section and the reinforcing bars of the newly added beam 4 are calculated and set according to the conventional method.
Through welding stud 6 or short muscle on mechanical crab-bolt fixed steel sheet 2 and the fixed steel sheet 2, effectively solve the roof beam problem of shearing, through setting up cyclic annular steel sheet hoop 3 and with the welding of roof beam longitudinal reinforcement 7, solve the effective anchor of the newly-increased concrete beam longitudinal reinforcement 7 in post both sides ingeniously and link up the purpose to realize the reliable connection of new and old structural member connected node.
The reasonable node connection mode effectively improves the force transmission and stress performance of the beam column node, the concept of structural stress is clear and definite, the effect of cast-in-place of the new and old concrete member connection node can be achieved, the construction is simple and easy, the field quality inspection is visual and reliable, and the cost for reinforcing the structure reconstruction is economic and controllable. Various defects and risks existing in the conventional connection method are overcome.
Example 2:
the present embodiment provides a specific implementation manner of a new beam and existing column node annular steel plate hoop conversion connection structure, as shown in fig. 1 to 3, other structures of the present embodiment are equal to those of embodiment 1, when the calculated data of the upper longitudinal steel bar 7 or the lower longitudinal steel bar 7 of the new beam 4 is greater than 6 Φ 25, the excess part of the new beam bypasses the column edge to form a vertical through longitudinal steel bar 9, and the corresponding beam cross section is subjected to haunched treatment at the column edge to form an haunched section 8, so that the beam-column connection node forms a splayed structure.
By adopting the technical scheme:
the newly added beam 4 has larger calculated span and load area, and when the number and the diameter of the longitudinal steel bars 7 at the upper part and the lower part of the newly added beam 4 are more than 6 phi 25, the problems of placement, anchoring and force transfer of the steel bars are effectively solved through adding the armpits, the section width of the newly added beam 4 is reduced, and the anti-seismic performance and the safe storage of the newly added beam 4 and the beam column node are obviously improved.
The working principle is as follows: as shown in fig. 1-3, the newly added beam and existing column node annular steel plate conversion connection structure makes full use of the high shear bearing capacity of the mechanical anchor bolt 5 in the concrete column (existing column 1), and the annular steel plate hoops 3 to realize effective anchoring and communication of the longitudinal steel bars of the beams on both sides of the column (by welding with the annular steel plate hoops 3). The shear force of the beam end is transmitted to the mechanical anchor bolt through the vertical steel plates on four sides of the column under the combined action of the annular steel plate hoop 3, the anchor bolt fastener (including an anchor bolt exposed part) and the stud 6 or the short rib, the shear bearing capacity of the group anchor is calculated according to the shear damage type of the anchor bolt specified in the technical specification of post anchoring of concrete structure (JGJ145-2013), and the design value of the shear bearing capacity of the group anchor of the mechanical anchor bolt is larger than the design value of the shear force of the beam end. The anchoring and the pulling force of the longitudinal beam steel bars are sequentially transmitted to the unilateral annular steel plate by the longitudinal steel bars 7 and the annular steel plate hoops 3 through double-sided welding 5D, the unilateral annular steel plate is transmitted to the two lateral annular steel plate hoops 3 perpendicular to the unilateral annular steel plate and the column four-side vertical steel plates 2 through welding seams and finally transmitted to the existing column 1, and the pull force of the upper longitudinal steel bar 7 and the lower longitudinal steel bar 7 is calculated in an equivalent generation according to the tensile strength of the steel bars and the welding seams in the concrete structure design specification (GB50010-20102015 edition).
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (4)
1. Newly add roof beam and the cyclic annular steel sheet hoop conversion connection structure of existing post node, its characterized in that: the steel column comprises existing columns, vertical steel plates are arranged on the peripheries of the existing columns, the vertical steel plates are fixedly connected with the existing columns through mechanical anchor bolts, and adjacent vertical steel plates are connected through partial penetration butt welds with single-side grooves;
the vertical steel plate outside is provided with rather than the cyclic annular steel plate hoop of vertically twice, and the cyclic annular steel plate hoop of twice corresponds the position of longitudinal reinforcement about newly-increased roof beam respectively, and cyclic annular steel plate hoop and vertical steel plate adopt fillet weld welding, and longitudinal reinforcement about newly-increased roof beam respectively with upper and lower annular steel plate hoop welding, the welding has a plurality of pegs on the vertical steel plate in newly-increased roof beam cross-sectional range.
2. The newly-added beam and existing column joint annular steel plate hoop conversion connection structure of claim 1, characterized in that: the number of the mechanical anchor bolts is determined based on the shear force of the anchor bolt bearing beam end.
3. The newly-added beam and existing column joint annular steel plate hoop conversion connection structure of claim 1, characterized in that: the thickness and the length of the annular steel plate hoop are equal to the tensile bearing capacity of the longitudinal steel bar of the newly added beam.
4. The newly-added beam and existing column joint annular steel plate hoop conversion connection structure of claim 1, characterized in that: when the calculated data of the longitudinal steel bars at the upper part or the lower part of the newly added beam is larger than 6 phi 25, the exceeding part of the newly added beam bypasses the column edge to form a through longitudinal steel bar, and the armpit processing is performed on the column edge corresponding to the beam section, so that the beam-column connection node forms a splayed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111110063.9A CN113653359A (en) | 2021-09-18 | 2021-09-18 | Newly-added beam and existing column joint annular steel plate hoop conversion connection structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111110063.9A CN113653359A (en) | 2021-09-18 | 2021-09-18 | Newly-added beam and existing column joint annular steel plate hoop conversion connection structure |
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| CN113653359A true CN113653359A (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111110063.9A Pending CN113653359A (en) | 2021-09-18 | 2021-09-18 | Newly-added beam and existing column joint annular steel plate hoop conversion connection structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982310A (en) * | 2021-11-18 | 2022-01-28 | 中铁建设集团基础设施建设有限公司 | Structure for additionally arranging cantilever structure on existing reinforced concrete beam and construction method |
-
2021
- 2021-09-18 CN CN202111110063.9A patent/CN113653359A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982310A (en) * | 2021-11-18 | 2022-01-28 | 中铁建设集团基础设施建设有限公司 | Structure for additionally arranging cantilever structure on existing reinforced concrete beam and construction method |
| CN113982310B (en) * | 2021-11-18 | 2022-11-08 | 中铁建设集团基础设施建设有限公司 | Structure for additionally arranging cantilever structure on existing reinforced concrete beam and construction method |
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