CN211368387U - Novel shear force component combination beam - Google Patents
Novel shear force component combination beam Download PDFInfo
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- CN211368387U CN211368387U CN201920820637.3U CN201920820637U CN211368387U CN 211368387 U CN211368387 U CN 211368387U CN 201920820637 U CN201920820637 U CN 201920820637U CN 211368387 U CN211368387 U CN 211368387U
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Abstract
The utility model provides a novel shear force spare combination beam, including concrete slab (1), stirrup (2), shear force spare (3) and girder steel (4), girder steel (4) set up in concrete slab (1) lower surface, concrete slab (1) is inside to be close to bottom surface department down and is provided with shear force spare (3), stirrup (2) set up perpendicularly in inside concrete slab (1), shear force spare (3) with stirrup (2) contact position welding. A novel shear force part combination beam realized that concrete slab reserves the accurate butt joint of hole site and girder steel connecting piece, the wholeness ability of guarantee concrete slab after reserving the hole site, full play shear force connecting piece's effect is connected steel construction and concrete structure and is become whole combined work.
Description
Technical Field
The utility model relates to a bridge construction field, concretely relates to combination beam.
Background
The steel-concrete composite structure is a structural form which integrates and works together a steel structure and a concrete structure through a shear connector, and the shear connector is the key of the stress performance of the steel-concrete composite structure. The structural form can give full play to the mechanical properties of steel and concrete materials, has the advantages of high bearing capacity, high rigidity, small self weight, good stability, convenient construction and the like, and is widely applied to the engineering fields of bridges, building structures, pipe galleries and the like.
With the development of engineering technology, people have higher and higher requirements on construction technology and engineering quality, and the application of the assembly type construction technology is increasingly wide. The structural assembly type construction can realize that all the components are finished in a factory, the component quality can be improved, the component material consumption is reduced, and the structural assembly type construction method has important significance for building energy conservation. The assembly type construction can greatly reduce the workload and time of site construction, and has important effects on projects with strict construction period requirements and severe site construction environments.
The assembly construction of the steel-concrete composite structure faces the problem of how to arrange the shear connectors. At present, the most widely used stud connectors need multi-point position coordination, reserved points in a precast concrete plate can be changed in position due to the shrinkage of concrete in the hardening process, and multi-point position matching in the installation process cannot be completed. The perforated steel plate connecting piece can not reserve a longitudinal penetrating seam in the precast concrete slab due to the fact that the perforated steel plate connecting piece penetrates through the precast concrete slab longitudinally and continuously, and effective connection of the perforated steel plate connecting piece and the precast concrete slab can not be achieved. In the existing separated type stud group connecting method, large holes are reserved in a concrete precast slab, longitudinal steel bars and transverse steel bars between the reserved holes are completely cut off, the integrity of a concrete slab is seriously influenced, force transmission is only carried out between the stud group and the precast concrete slab through post-cast concrete, and a stud connecting piece cannot fully play a role in connecting a steel structure and the concrete structure into a whole.
The assembly construction of the steel-concrete composite structure needs to solve three problems of the connecting piece. First, how the pre-formed holes in the precast concrete panels are precisely butted against the pin connectors on the steel structure. And secondly, how to reduce the reserved holes of the precast concrete plate and reduce the influence of the reserved holes on the integrity of the precast concrete plate. Thirdly, how to fully play the role of the shear connector to connect the steel structure and the concrete structure into a whole.
Patent CN201120487335 discloses a shear force spare that is arranged in fastening concrete of bridge construction, include the shear force spare body that comprises a plurality of interconnect's shear force spare unit, the shear force spare unit includes the backup pad, the both ends of backup pad are provided with the mounting panel, be provided with a plurality of groups of through-holes on the mounting panel, be provided with the support column between every group through-hole.
Although the patent adopts an integral formed by mutually connecting the shearing part units, the manufacturing process is also complicated due to the complicated structure of the supporting plate; meanwhile, due to the adoption of the arrangement mode of the shear member units, the shear members are integrated, but the influence on the integrity of concrete is large.
The reserved hole site in the precast concrete slab can be accurately butted with a stud connecting piece on a steel structure; the prepared hole of the concrete slab is smaller; and connecting the steel structure and the concrete structure into an integral composite beam.
Disclosure of Invention
The utility model discloses a solve concrete slab among the prior art and reserve the peg connecting piece butt joint precision on hole site and the steel construction, reduce the influence to precast concrete slab wholeness, the problem of full play shear force connecting piece's effect provides a novel shear force combination beam, and its concrete slab wholeness is high, and the preformed hole is less, and above-mentioned problem has been solved in easy accurate butt joint.
The invention provides a novel shear force component combination beam which comprises a concrete slab, stirrups, shear force components and a steel beam, wherein the steel beam is arranged on the lower surface of the concrete slab, the shear force components are arranged in the concrete slab and close to the lower bottom surface, the stirrups are vertically arranged in the concrete slab, and the contact positions of the shear force components and the stirrups are welded.
According to the novel shear force component combination beam, as a preferred mode, the shear force component comprises a pin bolt steel bar, a perforated steel plate and an embedded perforated steel plate, the perforated steel plate is provided with a mounting hole, the perforated steel plate is vertically arranged on the upper surface of a steel beam, the pin bolt steel plate is arranged in the mounting hole, a through hole is formed in the surface of the embedded perforated steel plate, the perforated steel plate is arranged in the through hole, and the embedded perforated steel plate is embedded in the bottom surface of a concrete structure. The two ends of the embedded steel plate with holes are aligned with the top of the formwork, so that the situation that the position of the embedded steel plate is changed in the concrete pouring process and cannot be matched and installed with a pre-designed connecting piece is avoided.
According to the novel shear component combination beam, as a preferred mode, the stirrups comprise the broken stirrups and the common stirrups, the broken stirrups are uniformly arranged on a vertical plane where the through holes of the pre-buried perforated steel plates are located, two ends of the broken stirrups are arranged on the bottom surfaces of two sides of the through holes of the pre-buried perforated steel plates, and the common stirrups are uniformly arranged on the vertical planes of two sides of the through holes of the pre-buried perforated steel plates.
The pin bolt steel bar mounting plate is buried in the concrete structure, so that the hole site butting precision of the shear connecting piece is improved; the pin bolt steel bar and the pin bolt steel bar mounting plate are simple, convenient, quick and reliable to connect. The steel plate with holes is provided with a preformed hole at a design position, the steel plate with holes is installed, and the two ends of the steel plate with holes are flush with the top of the template, so that the position is not changed in the concrete pouring process, and the accurate butt joint of the hole positions of the shear connectors is realized. After the foraminiferous steel sheet finishes installing in concrete structure, lay ordinary stirrup and disconnection stirrup to weld it with pre-buried foraminiferous steel sheet, the vertical reinforcing bar of this position department of foraminiferous steel sheet fungible has avoided this position department vertical reinforcing bar to break off because of the preformed hole, improves structural integrity.
The connecting method of the connecting piece is characterized in that after the concrete slab and the steel structure are prefabricated, the pin bolt steel bar is inserted into the pin bolt steel bar mounting plate after the through hole positions of the steel plates with holes are butted, and the reliable fixed connection of the shear connecting piece is completed.
The two kinds of prepared holes on the pin bolt steel bar mounting plate and the steel plate with holes are properly enlarged in consideration of concrete shrinkage and various error influences.
According to the novel shear force component combination beam, as a preferred mode, the embedded steel plate with holes is welded with the stirrups.
According to the novel shear force combination beam, as a preferable mode, the steel plates with holes are arranged longitudinally or transversely along the steel beam. The pin bolt steel column connecting plates can also be arranged along the transverse direction of the beam, so that the transverse shear resistance is improved. The pin bolt steel column connecting plates can be longitudinally arranged along the beam, and longitudinal shear resistance can be improved.
According to the novel shear force component combination beam, as a preferred mode, the pin bolt steel bar comprises the first round platform, the second round platform, the cylindrical connecting part and the first round platform, the second round platform and the cylindrical connecting part are coaxial, the lower bottom surfaces of the first round platform and the second round platform are arranged on the two bottom surfaces of the cylindrical connecting part, and the area of the lower bottom surfaces of the first round platform and the second round platform is smaller than or equal to that of the bottom surface of the cylindrical connecting part.
And the shuttle-like pin bolt steel bar is adopted, so that the positioning during splicing is facilitated, and the splicing efficiency is improved.
According to the novel shear part combination beam, as a preferable mode, the pin bolt steel bar is in interference fit with the mounting hole.
The enlargement of 1-2 mm should be considered when opening the hole to consider various error influences.
According to the novel shear force component combination beam, as a preferred mode, the concrete slab comprises a concrete body and high-performance fiber concrete, the concrete slab body is of a plate type, a reserved hole is formed in the lower bottom surface of the concrete slab body, a shear force component is arranged in the reserved hole, and the reserved hole is filled with the high-performance fiber concrete.
Considering the convenience of site construction, the self-compacting steam curing-free micro-expansive ultrahigh-performance fiber concrete is selected.
According to the novel shear force assembly beam, as an optimal mode, the through holes of the pre-buried steel plates with the holes are arranged corresponding to the reserved holes.
The stirrup comprises a disconnected stirrup connected with the shear connector and a common stirrup not connected with the shear connector, the position of the steel plate with holes on the orthographic projection surface is provided with the disconnected stirrup, and the position of the steel plate without holes on the orthographic projection surface is provided with the common stirrup.
The utility model provides a novel shear force spare combination beam construction method, including following step:
s1, manufacturing a pin bolt steel bar;
s2, manufacturing a steel beam and a steel plate with holes, wherein the steel plate with holes is welded on the top surface of the steel beam;
s3, manufacturing a concrete slab embedded steel plate with holes;
s4, carrying out on-site assembly, and carrying out butt joint assembly on the steel plate with the holes of the steel structure and the reserved hole sites of the concrete slab; inserting a pin bolt steel bar into the steel plate with the holes of the steel beam through the reserved holes of the concrete plate and the opposite ends of the embedded steel plates with the holes;
and S5, pouring self-compacting steam-curing-free micro-expansive ultrahigh-performance fiber concrete at the reserved hole position.
A novel shear force spare combination beam construction method, as preferred mode, step S3 specifically includes:
s31, supporting a prefabricated reinforced concrete structural template, laying a steel plate with holes, laying transverse common stirrups and broken stirrups at reserved hole positions, and welding the transverse common stirrups and the broken stirrups with the pre-buried steel plate with holes;
s32, laying longitudinal common steel bars;
s33, arranging a preformed hole at the position of the concrete slab connecting piece;
and S34, pouring concrete, and removing the formwork after the concrete is cured.
The utility model discloses beneficial effect as follows:
(1) the steel plate with the holes is pre-embedded in the reinforced concrete structure, so that the influence of concrete shrinkage is greatly reduced, and the accurate positioning of the hole position of the shear connector of the assembled steel-concrete structure is realized;
(2) the steel plate with holes is pre-embedded in the reinforced concrete structure and is welded with the common stirrups and the stirrups at the section openings, so that the influence of the disconnection of the stirrups at the reserved hole positions is avoided, and the structural integrity is improved;
(3) the steel plate with holes embedded in the reinforced concrete structure can replace the longitudinal steel bar at the position, so that the longitudinal steel bar at the position is prevented from being broken due to the reserved hole positions, and the structural integrity is improved;
(4) after the steel structure and the concrete structure are installed according to the reserved hole sites, the steel structure and the concrete structure are integrated by installing the pin bolt steel bar in the steel plate with the hole, so that the construction convenience is considered, the effective connection of the connecting piece can be ensured, the pin bolt steel bar has higher rigidity, the shearing force between the steel structure and the concrete structure can be effectively transmitted, and the lifting between the concrete structure and the steel structure is effectively resisted;
(5) the steel plates with holes can be flexibly arranged according to the longitudinal direction and the transverse direction of the beam, the space between the steel plates and the length of the steel plates with holes, wherein the sizes of the holes and the pin bolt steel bars can be flexibly arranged according to the actual assembly type engineering requirement, and the steel plates with holes have higher applicability;
(6) after the steel structure and the concrete structure are installed, self-compacting steam-curing-free micro-expansive ultrahigh-performance fiber concrete is poured in the reserved hole, and the operability of site construction is considered. The ultra-high performance fiber concrete and the common concrete are both cement-based materials, can be reliably bonded, has a compact material structure and good durability, and effectively transmits the force between a steel structure and a concrete structure and simultaneously more effectively protects the structure at the shear connection position.
Drawings
FIG. 1 is a schematic longitudinal section of a composite beam concrete slab;
FIG. 2 is a schematic view of a composite beam shear;
FIG. 3 is a schematic view of a pin bolt steel bar of the shear member of the composite beam;
FIG. 4 is a perspective schematic view of a composite beam concrete slab;
fig. 5 is a flow chart of a construction method of the composite beam.
Reference numerals:
1. a concrete slab; 11. a concrete slab body; 12. high performance fiber concrete; 2. hooping; 21. common hooping; 22. disconnecting the stirrups; 3. a shear member; 31. bolting the steel bar; 311. a first circular table; 312. a second circular table; 313. a cylindrical connecting portion; 32. a steel plate with holes; 33. pre-burying a steel plate with holes; 4. a steel beam.
Detailed Description
The technical solutions in the embodiments of the present invention will be made clear below by referring to the attached drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
As shown in fig. 1, a novel shear force component combination beam comprises a concrete slab 1, stirrups 2, shear force components 3 and a steel beam 4, wherein the steel beam 4 is arranged on the lower surface of the concrete slab 1, the shear force components 3 are arranged inside the lower bottom surface of the concrete slab 1, the stirrups 2 are vertically arranged inside the concrete slab 1, and the contact positions of the shear force components 3 and the stirrups 2 are welded.
As shown in fig. 2, the shear member 3 includes a pin steel bar 31, a perforated steel plate 32, and a pre-embedded perforated steel plate 33, wherein the largest plane of the perforated steel plate 32 is provided with a mounting hole, the perforated steel plate 32 is vertically arranged on the upper surface of the steel beam 4, the pin steel bar 31 is arranged in the mounting hole, the surface of the pre-embedded perforated steel plate 33 is provided with a through hole, the perforated steel plate 32 is arranged in the through hole, and the pre-embedded perforated steel plate 33 is embedded in the bottom surface of the concrete slab. The pin bolt steel bar 31 is in interference fit with the mounting hole. The enlargement of 1-2 mm should be considered when opening the hole to consider various error influences. The two ends of the steel plate are flush with the top of the template, so that the situation that the position of the embedded steel plate is changed in the concrete pouring process and cannot be matched and installed with a pre-designed connecting piece is prevented.
As shown in fig. 3, the pin-headed steel bar 31 includes a first circular truncated cone 311, a second circular truncated cone 312, a cylindrical connecting portion 313, and a first circular truncated cone 311, the second circular truncated cone 312 and the cylindrical connecting portion 313 are coaxial, lower bottom surfaces of the first circular truncated cone 311 and the second circular truncated cone 312 are disposed on two bottom surfaces of the cylindrical connecting portion 313, and the area of the lower bottom surfaces of the first circular truncated cone 311 and the second circular truncated cone 312 is less than or equal to that of the bottom surface of the cylindrical connecting portion 313. The pin bolt steel bar mounting plate 2 is made of a steel plate, the diameter of a round hole of the pin bolt steel bar mounting plate is matched with the diameter of a base circle of a cylindrical connecting part of the pin bolt steel bar, and the root of the pin bolt steel bar mounting plate is welded to the top of a steel structure.
As shown in fig. 4, the stirrup 2 comprises a breaking stirrup 22 and a common stirrup 21, the breaking stirrup 22 is uniformly arranged on a vertical plane where the through hole of the pre-buried perforated steel plate 33 is located, two ends of the breaking stirrup 22 are arranged on the bottom surfaces of two sides of the through hole of the pre-buried perforated steel plate 33, and the common stirrup 21 is uniformly arranged on the vertical plane of two sides of the through hole of the pre-buried perforated steel plate 33. The pre-buried steel plate with holes 33 is welded with the stirrups 2. The perforated steel plates 32 are arranged longitudinally or transversely along the steel beam 4. The concrete slab 1 comprises a concrete slab body 11 and high-performance fiber concrete 12, the concrete body 11 is of a plate type, a reserved hole is formed in the lower bottom surface of the concrete body 11, a shear part 3 is arranged in the reserved hole, and the high-performance fiber concrete 12 fills the reserved hole. The sizes of the reserved holes are arranged unevenly relative to the positions of the mounting through holes, one mounting through hole is a central line, the length of one mounting through hole is the total length of the pin bolt steel bar, the length of the counter bore of one mounting through hole is a half counter bore, the depth of the counter bore is slightly larger than the height of the steel plate 32 with holes, and the width of the counter bore is slightly larger than the width of the steel plate 32 with. The distance between the steel plates 2 with holes, the length of the steel plates and the arrangement form can be designed and determined according to the actual engineering requirements.
As shown in fig. 5, the novel construction method of the shear member combination beam comprises the following steps:
s1, manufacturing a pin bolt steel bar 31;
s2, manufacturing a steel beam 4 and a steel plate with holes 32, wherein the steel plate with holes 32 is welded on the top surface of the steel beam 4;
s3, manufacturing a concrete slab 1 and embedding a steel plate 33 with a hole;
s4, carrying out on-site assembly, and carrying out butt joint assembly on the steel plate 32 with the hole in the steel structure and the reserved hole site of the concrete plate 1; inserting a pin bolt steel bar 31 into the steel plate 32 with holes of the steel beam 4 through the reserved hole of the concrete plate 1 and the opposite end of the embedded steel plate with holes 33;
and S5, pouring self-compacting steam-curing-free micro-expansive ultrahigh-performance fiber concrete 12 at the reserved hole position.
Step S3 specifically includes:
s31, supporting a prefabricated reinforced concrete structural template, laying a steel plate with holes 32, laying a transverse common stirrup 21 and a broken stirrup 22 at a reserved hole site, and welding the transverse common stirrup 21 and the broken stirrup 22 with an embedded steel plate with holes 33;
s32, laying longitudinal common steel bars;
s33, arranging a preformed hole at the position of the concrete slab connecting piece;
and S34, pouring concrete, and removing the formwork after the concrete is cured.
The preformed hole with the foraminiferous steel sheet 2 assorted on the steel construction is reserved in the concrete structure prefabrication process, reserves simultaneously and can get into the preformed hole of reserving the steel sheet with the installation of cotter pin rod iron 1. Both prepared holes allow for proper enlargement to account for concrete shrinkage and various error effects.
The pre-buried perforated steel plate 33 is provided with a preformed hole at a design position, the pre-buried perforated steel plate 33 is installed, two ends of the pre-buried perforated steel plate 33 are flush with the top of the template, the position is not changed in the concrete pouring process, and the accurate butt joint of the hole positions of the shear connectors is realized. After the pre-buried perforated steel plate 33 is installed in the concrete structure, ordinary stirrups and broken stirrups are laid and welded with the pre-buried perforated steel plate 33.
After the prefabrication of the concrete structure and the steel structure is finished and the butt joint is finished according to the reserved hole positions, the pin bolt steel bar 1 is inserted into the steel plate 2 with the hole, and the reliable fixed connection of the shear connecting piece is finished.
After the concrete structure and the steel structure are assembled, self-compacting steam-curing-free micro-expansion ultrahigh-performance fiber concrete is poured in the reserved hole, and construction convenience and connection reliability are considered.
The utility model provides a shear connector and a construction method for an assembled steel-concrete composite structure, which is characterized in that a perforated steel plate 33 is pre-embedded in a concrete structure and is welded with stirrups, and a perforated steel plate 2 is welded on the top surface of a steel beam; after the prefabrication in a factory is finished, the steel bar is fixed through the pin bolt steel bar 1 after being installed through the reserved hole sites; and after the installation is finished, pouring self-compacting steam-curing-free micro-expansive ultrahigh-performance fiber concrete in the reserved hole. The connection mode greatly improves the integrity of the assembled steel-concrete composite structure, effectively enhances the shear strength and rigidity of the assembled steel-concrete composite structure, and ensures the cooperative work of a steel structure and a concrete structure.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (9)
1. The utility model provides a novel shear force spare combination beam which characterized in that: including concrete slab (1), stirrup (2), shear force spare (3) and girder steel (4), girder steel (4) set up in concrete slab (1) lower surface, concrete slab (1) is inside to be close to bottom surface department down and is provided with shear force spare (3), stirrup (2) set up perpendicularly in inside concrete slab (1), shear force spare (3) with stirrup (2) contact position welding.
2. The novel shear force combination beam of claim 1, wherein: shear force spare (3) are including cotter rod (31), foraminiferous steel sheet (32), pre-buried foraminiferous steel sheet (33), foraminiferous steel sheet (32) are provided with the mounting hole, foraminiferous steel sheet (32) vertical set up in girder steel (4) upper surface, cotter rod (31) set up in the mounting hole, pre-buried foraminiferous steel sheet (33) face is provided with the through-hole, foraminiferous steel sheet (32) set up in the through-hole, pre-buried foraminiferous steel sheet (33) inlay in concrete slab (1) bottom surface position.
3. The novel shear force combination beam of claim 2, wherein: stirrup (2) are including disconnection stirrup (22) and ordinary stirrup (21), disconnection stirrup (22) evenly set up in the vertical plane at pre-buried foraminiferous steel sheet (33) through-hole place, disconnection stirrup (22) both ends set up in pre-buried foraminiferous steel sheet (33) through-hole both sides bottom surface, ordinary stirrup (21) evenly set up in the vertical plane of pre-buried foraminiferous steel sheet (33) through-hole both sides.
4. The novel shear force combination beam of claim 3, wherein: the embedded steel plate with holes (33) is welded with the stirrups (2).
5. The novel shear force combination beam of claim 4, wherein: the steel plate with holes (32) is arranged along the longitudinal direction or the transverse direction of the steel beam (4).
6. A novel shear member combination beam as claimed in any one of claims 4 to 5, wherein: the pin bolt steel bar (31) comprises a first round platform (311), a second round platform (312) and a cylindrical connecting portion (313), wherein the first round platform (311) is coaxial with the second round platform (312), the bottom surfaces of the first round platform (311) and the second round platform (312) are arranged on two bottom surfaces of the cylindrical connecting portion (313), and the area of the bottom surface of the first round platform (311) and the area of the bottom surface of the second round platform (312) are smaller than or equal to the area of the bottom surface of the cylindrical connecting portion (313).
7. The novel shear force combination beam of claim 5, wherein: the pin bolt steel bar (31) is in interference fit with the mounting hole.
8. The novel shear force combination beam of claim 5, wherein: concrete slab (1) includes concrete slab body (11) and high performance fiber concrete (12), concrete slab body (11) are board-like, the bottom surface is provided with the preformed hole under concrete slab body (11), the preformed hole is the through-hole, be provided with in the preformed hole shear force spare (3), high performance fiber concrete (12) are filled the preformed hole.
9. The novel shear force combination beam of claim 8, wherein: the through holes of the pre-buried steel plates with holes (33) are arranged corresponding to the preformed holes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110158464A (en) * | 2019-06-03 | 2019-08-23 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of novel shear key combination beam and its construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110158464A (en) * | 2019-06-03 | 2019-08-23 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of novel shear key combination beam and its construction method |
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