CN214459550U - Prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint - Google Patents
Prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint Download PDFInfo
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- CN214459550U CN214459550U CN202022772064.7U CN202022772064U CN214459550U CN 214459550 U CN214459550 U CN 214459550U CN 202022772064 U CN202022772064 U CN 202022772064U CN 214459550 U CN214459550 U CN 214459550U
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Abstract
The utility model discloses a prefabricated assembled steel-concrete composite beam bolted in longitudinal section, which comprises a prefabricated girder segment, a longitudinal connecting segment and a transverse connecting segment, wherein the prefabricated girder segment comprises a steel beam, a concrete slab and a shear connecting piece, and the steel beam comprises a top plate, a bottom plate and a web plate; the adjacent bottom plate and the web plate are fastened and connected through a connecting plate and a first bolt, the adjacent top plate is fastened and connected through a connecting plate and a second bolt, the tail part of the second bolt penetrates through the connecting plate above the top plate and then extends upwards, a first nut and a second nut are screwed on the extending part, and the first nut is used for locking the top plate; the connection of the adjacent prefabricated main beam sections is realized at the longitudinal connecting section through the wet joint of the longitudinal connecting section; and the connection of the adjacent main beam structures is realized at the transverse connecting sections through the wet joints of the transverse connecting sections. The steel-concrete composite beam is prefabricated in sections, so that the transportation and the hoisting are convenient; the whole bolt connection is adopted, so that the welding of the bottom plate on the top is avoided, and the construction is convenient.
Description
Technical Field
The utility model relates to a bridge technical field, in particular to prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint.
Background
With the acceleration of the urbanization process, the construction of traffic and municipal infrastructure of various provinces and cities in China gradually gets into climax, and a large number of projects with large project quantity and long construction period emerge.
For municipal bridge projects, the traditional cast-in-place construction easily causes sudden drop of traffic capacity in construction areas due to the fact that urban areas are crossed, so that smooth traffic and safety of roads are affected, even traffic interruption often occurs, and working life of residents is greatly affected. In addition, the traditional cast-in-place site has large workload, low construction efficiency, high overall energy consumption and serious disturbance to residents. The assembled bridge can remarkably accelerate the construction progress, reduce the interference to the existing traffic and be beneficial to environmental protection through the industrialized manufacturing and the assembled construction of the components.
The reinforced concrete composite beam connects the concrete bridge deck and the steel beam into a whole through the shear connector, and the advantages of respective materials are exerted by utilizing the tension of the steel beam and the compression of the concrete bridge deck, so that the reinforced concrete composite beam is a bridge structure with strong competitiveness, is easy to design into an assembly type member, and is convenient and fast to construct on site.
The design method of the assembly type steel-concrete composite beam commonly used at the present stage is to set a main beam as a large longitudinal through long component and cast longitudinal wet joints in situ. Although the construction speed is high, the transportation and hoisting in the city are limited, and the bridge span length is small. For example, in the project of rapid transformation of the long-sand Xiang Fu road, the span of the steel-concrete composite beam is 30m, and the steel consumption of the small-span steel-concrete composite beam is large, so that the structural advantages of the steel-concrete composite beam are not brought into full play.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a prefabricated assembled steel-concrete composite beam of vertical segmentation bolt to solve the problem that provides among the above-mentioned background art.
The technical scheme adopted for solving the technical problems is as follows: a prefabricated assembled steel-concrete composite beam bolted in longitudinal sections comprises a plurality of prefabricated main beam sections, longitudinal connecting sections and transverse connecting sections, wherein adjacent prefabricated main beam sections are connected through the longitudinal connecting sections to form a main beam structure, and adjacent main beam structures are connected through the transverse connecting sections to form a bridge span structure; the precast main beam segment comprises a steel beam, a concrete plate and a plurality of shear connectors, the steel beam comprises a top plate, a bottom plate and a web plate connected between the top plate and the bottom plate, the concrete plate is positioned above the top plate, one ends of the shear connectors are poured and fixed in the concrete plate, and the other ends of the shear connectors are welded and fixed on the top plate;
the adjacent bottom plate and the web plate are in butt joint and then are in fastening connection through a connecting plate and a first bolt, the adjacent top plate is in fastening connection through a connecting plate and a second bolt after being in butt joint, the second bolt penetrates through the top plate from bottom to top, the head of the second bolt abuts against the connecting plate below the top plate, the tail of the second bolt penetrates through the connecting plate above the top plate and extends upwards, a first nut and a second nut are screwed on the tail of the second bolt, the first nut abuts against the connecting plate above the top plate after being screwed, the second nut is screwed on the extending part of the second bolt, and the second nut stays at the longitudinal connecting section;
the connection of the adjacent prefabricated main beam sections is realized at the longitudinal connecting sections through longitudinal connecting section wet joints; and the connection of the adjacent main beam structures is realized at the transverse connecting sections through the wet joints of the transverse connecting sections.
As an improvement of the above scheme, the concrete slab comprises reinforcing steel bars distributed transversely and longitudinally, two ends of the reinforcing steel bars extend out of the concrete slab, and the reinforcing steel bars extend to the longitudinal connecting section and the transverse connecting section respectively.
As a modification of the above, the top plate has a width greater at both ends than in the middle.
As an improvement of the scheme, the number of the prefabricated main beam sections is 3, the middle beam is positioned in the middle, and the edge beams are connected to the two ends of the middle beam.
As an improvement of the scheme, the bottom of the middle position of the middle beam is provided with a first reinforcing rib.
As an improvement of the scheme, the bottom of the edge beam is provided with a long hole.
As a modification of the above scheme, the bottom of the middle beam is provided with a second reinforcing rib along the axial direction.
As an improvement of the scheme, a cross beam is arranged between the prefabricated main beam sections.
The utility model has the advantages that:
the conventional longitudinal through-length prefabricated steel-concrete composite beam is longitudinally segmented, the problem that large segments are difficult to transport and hoist is solved, the bridge span is favorably improved, the structural advantages of the steel-concrete composite beam are fully exerted, the construction is fast and convenient, the industrial production, the segmented transport and the assembly construction can be realized, and the traffic interference time is shortened. The prefabricated main beam sections are connected through the full bolts, so that the problem of welding quality possibly caused by overhead welding of the bottom plate is avoided, and construction is facilitated. The roof is widened for the pressurized area of girder structure increases, accomplishes to demolish interim mound after the bolt joint is accomplished, has reduced the traffic interference to the road below greatly. The second bolt has not only realized the fastening between the roof, still can be with girder steel and concrete post-cast section even whole, has avoided the setting of this position toggle, has simplified the construction.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a top view of a longitudinally sectioned bolted prefabricated assembled steel-concrete composite beam;
FIG. 2 is a schematic cross-sectional view of a prefabricated assembled steel-concrete composite beam bolted in longitudinal sections;
FIG. 3 is a transverse cross-sectional schematic view of a prefabricated main beam segment;
FIG. 4 is a schematic view of the attachment of a second bolt-on top plate;
FIG. 5 is a top view of a prefabricated main beam segment;
FIG. 6 is a schematic cross-sectional view of a beam disposed between the main beam structures.
Detailed Description
Referring to fig. 1 to 6, the utility model relates to a prefabricated steel-concrete composite beam of vertical segmentation bolt joint, including a plurality of prefabricated girder segments, longitudinal joint section and transverse connection section, adjacent prefabricated girder segment passes through the girder structure that longitudinal joint section connects formation target span, and adjacent girder structure passes through the transverse connection section and connects formation bridge span structure.
Specifically, the precast main girder segment comprises a steel girder 10, a concrete plate 20 and a plurality of shear connectors 30, wherein the steel girder 10 comprises a top plate 11, a bottom plate 13 and a web plate 12 connected between the top plate 11 and the bottom plate 13, the concrete plate 20 is located above the top plate 11, one ends of the plurality of shear connectors 30 are poured and fixed in the concrete plate 20, and the other ends of the plurality of shear connectors 30 are welded and fixed on the top plate 11. The steel beam 10 may be an i-shaped steel or a channel steel.
The adjacent base plate 13 and the web plate 12 are butted and then fastened by a connecting plate 50 and a first bolt 41, wherein the first bolt 41 is a common bolt. The adjacent top plates 11 are in butt joint and then are in fastening connection through a connecting plate 50 and a second bolt 42, the second bolt 42 is a lengthened bolt, the second bolt 42 penetrates through the top plate 11 from bottom to top, the head of the second bolt 42 abuts against the connecting plate 50 below the top plate 11, the tail of the second bolt 42 penetrates through the connecting plate 50 above the top plate 11 and extends upwards, the tail of the second bolt 42 is in threaded connection with a first nut 43 and a second nut 44, the first nut 43 abuts against the connecting plate 50 above the top plate 11 after being screwed, the second nut 44 is in threaded connection with the extending part of the second bolt 42, and the second nut 44 stays at the longitudinal connecting section.
The connection of adjacent prefabricated main beam sections is realized at the longitudinal connecting sections through longitudinal connecting section wet joints 60; the connection of adjacent main beam structures is achieved at the transverse connecting sections by transverse connecting section wet joints 70, thereby forming a bridge span structure.
Preferably, the concrete slab 20 includes reinforcing bars 21 distributed transversely and longitudinally therein, and both ends of the reinforcing bars 21 are protruded from the concrete slab 20. The reinforcing steel bars 21 extend to the longitudinal connecting section and the transverse connecting section respectively, the reinforcing steel bars 21 can be vertically inserted into the area provided with the second bolt 42, the wet joint 60 of the longitudinal connecting section is constructed after the reinforcing steel bars 21 are connected with the second bolt 42 conveniently, and then the adjacent prefabricated main beam sections are connected to form a main beam structure.
The second bolts 42 not only realize the fastening between the top plates 11, but also can connect the steel beam 10 and the concrete post-cast section into a whole, thereby avoiding the arrangement of the studs at the position and simplifying the construction. Wherein the first nut 43 screwed below the second bolt 42 is used for the connection of the top plate 11, the second nut 44 positioned above is used for resisting the pull-out force of the post-cast concrete, and the body portion of the second bolt 42 is used for resisting the horizontal force of the post-cast concrete. A washer is provided between the first nut 43 and the connecting plate 50 and between the head of the second bolt 42 and the connecting plate 50 to secure the fastening effect.
The main girder structure is mainly manufactured in a prefabricating factory, is favorable for ensuring the engineering quality, is suitable for the steel-concrete composite girder with larger span, and has good technical and economic benefits and wide application prospect. The conventional longitudinal through-length prefabricated steel-concrete composite beam is longitudinally segmented, the problem that large segments are difficult to transport and hoist is solved, the bridge span is favorably improved, the structural advantages of the steel-concrete composite beam are fully exerted, the construction is fast and convenient, the industrial production, the segmented transport and the assembly construction can be realized, and the traffic interference time is shortened. The prefabricated main beam sections are connected through the full bolts, so that the welding quality problem possibly caused by overhead welding of the bottom plate 13 is avoided, and the construction is facilitated.
Preferably, the top plate 11 is set to have a width greater at both ends than in the middle for improved structural stability and increased area of the compression region. The top plates 11 at the two ends of the prefabricated main beam sections are widened and can be thickened properly if necessary, and the shear connectors 30 are also arranged above the widened areas of the top plates 11. The top plate 11 is widened, so that the pressed area of the main beam structure is increased, the temporary pier can be detached after bolting, and the traffic interference to the road below is greatly reduced.
Preferably, in order to enable the longitudinal connecting sections to avoid the position with the maximum positive bending moment in the midspan, the number of the prefabricated main beam sections is 3, the middle beam is arranged in the middle, and the edge beams are connected to the two ends of the middle beam.
In order to further improve the material utilization rate and increase the pre-bending moment, the manufacturing length of the middle beam is lengthened, and a first stiffening rib is arranged at the bottom of the middle beam. The steel beam 10 adopts a groove-shaped section to improve the torsion resistance and distortion resistance of the steel beam, a long hole is formed in a bottom plate 13 of the side beam to reduce the steel consumption, and a second reinforcing rib is axially arranged at the bottom of the middle beam to improve the structural stability in the pre-bending process.
A construction method of a prefabricated assembled steel-concrete composite beam bolted in longitudinal sections comprises the following steps:
s1, prefabricating the prefabricated girder segments;
s2, arranging a temporary pier below the longitudinal connecting section, hoisting the prefabricated main beam sections, and completing splicing of adjacent prefabricated main beam sections through bolt connection;
and S3, screwing the second nut 44 at the tail part of the second bolt 42, connecting the reinforcing steel bars 21 of the concrete slab 20 and pouring the longitudinal connecting section wet joint 60 and the transverse connecting section wet joint 70.
And S4, after the prefabricated girder segments are bolted, transferring the dead weight load of the prefabricated girder segments to the adjacent prefabricated girder segments, and then removing the temporary piers.
In step S1, when prefabricating a prefabricated girder segment located at the middle portion of a girder structure, beam tops fixed to both ends of the prefabricated girder segment by using reaction frames are set, jacks are provided at the bottom of the prefabricated girder segment and a jacking force is applied, the jacking force is replaced by a mid-span beam bottom support when the jacking force reaches a predetermined value, and then a concrete slab 20 at the top of the girder 10 is poured.
When the number of the prefabricated main beam sections is 3, the prefabricated middle beam is set to be a pre-bending structure so as to adapt to larger positive bending moment of the middle beam and be beneficial to full play of material performance; the bending moment of the prefabricated edge beam is small, so that pre-bending is not carried out, and the prefabrication cost is saved.
The prefabricated main beam sections meet the requirement of coordination of the engineering building modulus, industrial large-scale production is facilitated, the width of the wet joint 70 of the transverse connecting section is adjustable, and the prefabricated main beam sections are suitable for application of the widening section.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those skilled in the art.
Claims (8)
1. The utility model provides a prefabricated assembled steel-concrete composite beam of vertical segmentation bolt, its characterized in that: the bridge structure comprises a plurality of prefabricated main beam sections, longitudinal connecting sections and transverse connecting sections, wherein adjacent prefabricated main beam sections are connected through the longitudinal connecting sections to form a main beam structure, and adjacent main beam structures are connected through the transverse connecting sections to form a bridge span structure; the precast main beam segment comprises a steel beam, a concrete plate and a plurality of shear connectors, the steel beam comprises a top plate, a bottom plate and a web plate connected between the top plate and the bottom plate, the concrete plate is positioned above the top plate, one ends of the shear connectors are poured and fixed in the concrete plate, and the other ends of the shear connectors are welded and fixed on the top plate;
the adjacent bottom plate and the web plate are in butt joint and then are in fastening connection through a connecting plate and a first bolt, the adjacent top plate is in fastening connection through a connecting plate and a second bolt after being in butt joint, the second bolt penetrates through the top plate from bottom to top, the head of the second bolt abuts against the connecting plate below the top plate, the tail of the second bolt penetrates through the connecting plate above the top plate and extends upwards, a first nut and a second nut are screwed on the tail of the second bolt, the first nut abuts against the connecting plate above the top plate after being screwed, the second nut is screwed on the extending part of the second bolt, and the second nut stays at the longitudinal connecting section;
the connection of the adjacent prefabricated main beam sections is realized at the longitudinal connecting sections through longitudinal connecting section wet joints; and the connection of the adjacent main beam structures is realized at the transverse connecting sections through the wet joints of the transverse connecting sections.
2. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 1, characterized in that: the concrete slab comprises reinforcing steel bars which are distributed transversely and longitudinally, two ends of each reinforcing steel bar extend out of the concrete slab, and the reinforcing steel bars extend to the longitudinal connecting section and the transverse connecting section respectively.
3. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 2, characterized in that: the top plate has a width at both ends greater than a width in the middle.
4. The longitudinally segmented bolted precast concrete composite beam according to any one of claims 1 to 3, characterized in that: the prefabricated girder sections are 3 in number, the middle beam is positioned in the middle, and the edge beams are connected to the two ends of the middle beam.
5. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 4, characterized in that: and a first reinforcing rib is arranged at the bottom of the middle position of the middle beam.
6. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 5, characterized in that: and the bottom of the edge beam is provided with a long hole.
7. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 6, characterized in that: and a second reinforcing rib is arranged at the bottom of the middle beam along the axial direction.
8. The longitudinally segmented bolted precast assembled steel-concrete composite beam of claim 4, characterized in that: and a cross beam is arranged between the prefabricated main beam sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022772064.7U CN214459550U (en) | 2020-11-25 | 2020-11-25 | Prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022772064.7U CN214459550U (en) | 2020-11-25 | 2020-11-25 | Prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint |
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| Publication Number | Publication Date |
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| CN214459550U true CN214459550U (en) | 2021-10-22 |
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| CN202022772064.7U Active CN214459550U (en) | 2020-11-25 | 2020-11-25 | Prefabricated assembled steel-concrete composite beam of vertical segmentation bolt joint |
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