CN210507091U - Assembled prestressed combined box girder - Google Patents
Assembled prestressed combined box girder Download PDFInfo
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- CN210507091U CN210507091U CN201920916451.8U CN201920916451U CN210507091U CN 210507091 U CN210507091 U CN 210507091U CN 201920916451 U CN201920916451 U CN 201920916451U CN 210507091 U CN210507091 U CN 210507091U
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- plate
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- box girder
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Abstract
The utility model discloses an assembled prestressed composite box girder, which comprises a plurality of box girder units, wherein each box girder unit comprises a bottom plate, a web plate, an end plate and a top plate; the bottom plate is a concrete precast slab, and a plurality of mounting bases are pre-embedded on the upper surface of the bottom plate along the length direction of the slab; the top of the web plate is provided with a connecting reinforcement, the number of the web plates is matched with that of the mounting bases, and the web plates are arranged in parallel along the plate length direction and detachably connected with the mounting bases; the end plate is arranged on the bottom plate and detachably connected between two adjacent webs; the top plate is a concrete precast slab, a post-pouring hole penetrating the thickness of the slab is reserved on the top plate, and the top plate is arranged on the web plate to enable the post-pouring hole to be sleeved outside the connecting reinforcement. Because each part all is prefabricated in the mill, improved construction speed and quality, adopt the web of dismantling the connection to solve the not enough problem of support department concrete main tensile stress, also can avoid the additional stress that the shrink that produces among the traditional concrete beam concrete slab curing process warp and arouse the steel ripple steel web, ensure bearing capacity.
Description
Technical Field
The utility model belongs to the technical field of the bridge construction, especially, relate to an assembled prestressing force combination case roof beam.
Background
The bridge structure with more applications is the traditional reinforced concrete beam at present. The structure has self-weight and is not suitable for transportation; the tensile strength of the beam body is insufficient, and the beam body is easy to crack; the cast-in-place is mostly adopted, the wet operation amount is large, the construction speed is slow, and particularly, the economic benefit is obviously reduced when the urban bridge is built; low prestress utilization rate.
With the rapid development of the building industry, the requirements on the construction period are more and more strict, practitioners design corrugated steel web-concrete composite beams, and the problems are solved to a certain extent, but the following defects still exist:
a. the steel corrugated steel web plates are embedded into the concrete plates, and when concrete is cured, the concrete shrinkage can cause additional stress of the corrugated steel web plates, so that the bearing capacity of the corrugated steel web plates is adversely affected;
b. at present, the engineering mainly adopts a method of transporting the sub-beam sections prefabricated in factories to the site to be assembled into a whole, and the method has the problems of difficult transportation, easy damage of key components, high difficulty of site construction and the like;
c. at present, the corrugated steel web-prestressed concrete composite beam in engineering mainly adopts external prestressed tendons, and the external prestressed tendons have low durability, poor fatigue resistance, easy corrosion and easy fracture and have a plurality of potential safety hazards.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's weak point, provide an assembled prestressing force combination case roof beam of avoiding concrete contraction to influence web bearing capacity.
The utility model provides an assembled prestressed composite box girder, which comprises a plurality of box girder units, wherein each box girder unit comprises a bottom plate, a web plate, an end plate and a top plate; the bottom plate is a concrete precast slab, and a plurality of mounting bases are pre-embedded on the upper surface of the bottom plate along the length direction of the slab; the top of the web plate is provided with a connecting reinforcement, the number of the web plates is matched with that of the mounting bases, and the web plates are arranged in parallel along the plate length direction and detachably connected with the mounting bases; the end plate is arranged on the bottom plate and detachably connected between two adjacent webs; the top plate is a concrete precast slab, a post-pouring hole penetrating the thickness of the slab is reserved on the top plate, and the top plate is arranged on the web plate to enable the post-pouring hole to be sleeved outside the connecting reinforcement.
In one embodiment, the base plate is made as a unitary piece, comprising a plate body, an upper boss and a lower boss; the plate main body is a rectangular plate, the sections of the upper boss and the lower boss are both trapezoidal, the lower bottom surface of the upper boss is located on the upper surface of the plate main body, the lower bottom surface of the lower boss is located on the lower surface of the plate main body, and a hole for the steel bar bundles to pass through is formed in the lower boss along the length direction.
In order to facilitate connection, the web is an integral steel plate and comprises a corrugated section and straight sections on two sides, a row of mounting holes are formed in the bottom edge of the corrugated section, and a row of mounting holes are formed in the straight sections in the plate height direction.
In order to improve the integrity, the connection reinforcing piece comprises a strip-shaped plate and a plurality of groups of studs fixedly connected to the strip-shaped plate; the connection reinforcing part is fixedly connected to the top of the web plate through a strip-shaped plate, and the stud extends into the post-pouring hole.
Preferably, the mounting base is a T-shaped base and comprises a flat plate and a vertical plate, the vertical plate is a corrugated plate matched with the corrugated section, the vertical plate is provided with a through hole, and the vertical plate is fixedly connected to the flat plate; the flat plate is embedded in the bottom plate, the vertical plate extends to the upper surface of the bottom plate, and the web plate is fastened with the mounting base through a fastener penetrating through the mounting hole and the through hole.
In one embodiment, the end plate is a fitting comprising a bulkhead and a side plate; the partition plate and the side plates are rectangular plates, a pair of side plates are fixedly connected to the outer side of the partition plate, and connecting plates are arranged on the side plates; the end plates are arranged on the bottom plate and between two adjacent upper bosses, the two side plates are respectively connected with the corresponding web plates, one end of each connecting plate is connected with the strip-shaped plate, and the other end of each connecting plate is connected with the strip-shaped plate of the adjacent box girder unit to complete splicing.
In order to improve the stress performance, a reinforcing transverse plate is arranged in the box girder unit corresponding to the area between the two end plates and connected between the two webs, and a connecting plate is arranged at the top of the reinforcing transverse plate to be connected with the strip-shaped plate so as to improve the connection reliability.
In order to ensure the connection reliability, epoxy resin is filled in a gap between two adjacent box girder units.
The utility model discloses at first transport to the job site after each part is prefabricated in mill, lay the bottom plate earlier, then assemble web pre-buried installation base department on the bottom plate, install the end plate in the tip of web after that, place the roof on web and end plate again, make the post-cast hole cover outside connecting the reinforcement, at last behind cast in the hole cast concrete can. Because each part all is prefabricated in the mill, construction speed and quality have been improved greatly, adopt the web of dismantling the connection to replace and cut, the lower concrete of tensile stress, not only to the influence of environment the minimum, still alleviateed the roof beam body dead weight greatly, make the not enough problem of concrete main tensile stress of being close to support department also obtain solving, can also avoid the shrinkage deformation that produces in the traditional mixed beam concrete slab maintenance process and arouse the additional stress of steel corrugated steel web simultaneously, ensure bearing capacity.
Drawings
Fig. 1 is an axial view of a preferred embodiment of the present invention.
Fig. 2 is an exploded view of the preferred embodiment.
Sequence numbers of the drawings:
1-bottom plate, 11-plate body, 12-upper lug boss, 13-lower lug boss;
2-web, 21-corrugated section, 22-straight section;
3-end plate, 31-partition plate, 32-side plate, 33-connecting plate;
4-top plate, 41-post-pouring hole;
5, mounting a base, 51, a flat plate and 52, a vertical plate;
6-connecting a reinforcing part, 61-a strip-shaped plate, 62-a stud;
7-bolt.
Detailed Description
First preferred embodiment, as shown in fig. 1 and 2, the fabricated prestressed composite box girder disclosed in this embodiment is suitable for a case where the girder span is short, and includes a section of box girder unit, which includes a bottom plate 1, a web 2, an end plate 3 and a top plate 4.
As shown in fig. 1 and 2, the bottom plate 1 is a concrete precast monolithic plate, and includes a plate main body 11, an upper boss 12, and a lower boss 13. The plate main body is a rectangular plate, the cross sections of the upper boss and the lower boss are both trapezoidal, the lower bottom surface of the upper boss is located on the upper surface of the plate main body, and the lower bottom surface of the lower boss is located on the lower surface of the plate main body. The lower boss is internally provided with a hole passage for the tendon to pass through along the length direction, the tendon penetrates into the hole passage to exert prestress, wherein the tensioning of the prestress tendon can adopt a pre-tensioning method or a post-tensioning method according to the actual situation, and a reserved space is arranged between the lower boss and the end part of the bottom plate so as to facilitate the tensioning and anchoring of the prestress tendon and meet the requirements of the beam body on stress deformation and the like; the upper lug boss is internally embedded with an installation base 5. The mounting base 5 is a T-shaped base and comprises a flat plate 51 and a vertical plate 52, the vertical plate is a corrugated plate and is provided with through holes, and the vertical plate is fixedly connected to the flat plate; the flat plate is embedded in the bottom plate, and the vertical plate extends to the upper surface of the bottom plate and is used for mounting the web plate 2.
The web 2 is a high-strength integral steel plate and comprises a corrugated section 21 and straight sections 22 at two sides, a row of mounting holes are formed in the bottom edge of the corrugated section, a row of mounting holes are formed in the straight upper edge along the plate height direction, and a connecting reinforcement 6 is welded on the inner side of the top of the web 2; the connection reinforcement 6 comprises a strip-shaped plate 61 and a plurality of groups of studs 62 fixedly connected to the strip-shaped plate; the connecting reinforcing piece is welded on the top of the web plate by a strip-shaped plate; when the installation is carried out, the web plate is arranged on the flat plate and is attached to the vertical plate, and is fastened with the installation base through a bolt 7 which passes through the installation hole and the through hole and a nut; the end plate 3 is then assembled through the straight section 22.
The end plate 3 is an assembly comprising a partition plate 31 and a side plate 32; the partition plate and the side plates are rectangular plates, a pair of side plates are fixedly connected to the outer side of the partition plate, mounting holes are formed in the side plates, and a connecting plate 33 is welded to the top of each side plate to be attached to the strip-shaped plate; the connecting plate and the strip-shaped plate can be directly welded, and the connection has the advantages that the problem of space reservation does not need to be considered when the top is manufactured, but the connection is inconvenient to disassemble; when a space is reserved on the concrete top plate, the strip-shaped plates and the connecting plates can be connected through bolts so as to be convenient to disassemble. When the assembly is carried out, the end plates are arranged on the bottom plate and between the two adjacent upper bosses, and the two side plates are respectively attached to the straight sections of the corresponding web plates and fastened through bolts and nuts which penetrate through the mounting holes. In order to improve the stress effect, a partition plate and a connecting plate can be additionally arranged between two end plates in the web plate, two sides of the partition plate are directly welded to the web plate respectively, or corrugated side plates with shapes matched with those of corrugated sections are welded to two sides of the partition plate, and the corrugated side plates are connected with the corrugated sections of the web plate through bolts; the top plate 4 is installed after the end plate is assembled.
The top plate 4 is a concrete precast slab, a post-cast hole 41 penetrating the thickness of the slab is reserved on the top plate, and the top plate is arranged on the web plate to enable the post-cast hole to be sleeved outside the stud connected with the reinforcing part; after the top plate is placed, concrete is poured into the post-pouring hole, and the overall effect is improved through the post-pouring concrete.
The second preferred embodiment is different from the first preferred embodiment in that the second preferred embodiment is suitable for the condition of longer beam span and comprises a plurality of sections of box girder units, each section of box girder unit is spliced through a connecting plate on an end plate, strip-shaped plates in two adjacent box girder units extend to the same connecting plate and then are welded to complete the splicing of a steel structure, concrete is poured into a post-pouring hole to ensure the integrity, and epoxy resin is filled in a splicing seam between two adjacent box girder units to ensure the reliable connection.
Additionally, the utility model discloses can also set up multi-box or single box according to the different width of roof beam.
To sum up, the utility model discloses according to different beam width, roof beam stride the combination of chooseing for use different when specifically using, at first transport each part to the job site after the mill prefabrication during the preparation, lay the bottom plate earlier, then assemble web pre-buried installation base department on the bottom plate, install the end plate in the tip of web after that, place the roof on web and end plate again, make the post-cast hole cover outside connecting the reinforcement, at last to pour into a mould the concrete in the hole backward can.
Compared with the prior art, the method has the following advantages: the prefabricated plate type assembly structure of the factory greatly improves the construction speed and quality; the detachably connected high-strength light corrugated steel web is adopted to replace concrete with low shearing and tensile stress, so that the influence on the environment is reduced to the minimum degree, the self weight of the beam body is greatly reduced, the problem of insufficient main tensile stress of the concrete close to the support is solved, the additional stress of the steel corrugated steel web caused by shrinkage deformation generated in the traditional concrete slab curing process of the mixed beam can be avoided, and the bearing performance is ensured; compared with the traditional prestressed concrete beam, the concrete bottom plate is provided with a plurality of prestressed tendon installation pore channels, and the horizontal compressive capacity of the corrugated steel web plate is very low, so that the prestressed tendons and the concrete compressive capacity of the top plate are more fully utilized; a post-pouring hole is reserved in the concrete top plate, so that the upper top plate can be conveniently assembled on site; when the beam span is longer, the sectional type assembling is adopted, so that adverse effects caused by concrete shrinkage and creep are reduced, the construction progress is accelerated, and the economic benefit is effectively improved.
Claims (8)
1. The utility model provides an assembled prestressing force combination case roof beam which characterized in that: the box girder comprises a plurality of box girder units, wherein each box girder unit comprises a bottom plate, a web plate, an end plate and a top plate;
the bottom plate is a concrete precast slab, and a plurality of mounting bases are pre-embedded on the upper surface of the bottom plate along the length direction of the slab;
the top of the web plate is provided with a connecting reinforcement, the number of the web plates is matched with that of the mounting bases, and the web plates are arranged in parallel along the plate length direction and detachably connected with the mounting bases;
the end plate is arranged on the bottom plate and detachably connected between two adjacent webs;
the top plate is a concrete precast slab, a post-pouring hole penetrating the thickness of the slab is reserved on the top plate, and the top plate is arranged on the web plate to enable the post-pouring hole to be sleeved outside the connecting reinforcement.
2. The fabricated prestressed composite box girder of claim 1, wherein: the bottom plate is an integral piece and comprises a plate main body, an upper boss and a lower boss; the plate main body is a rectangular plate, the sections of the upper boss and the lower boss are both trapezoidal, the lower bottom surface of the upper boss is located on the upper surface of the plate main body, the lower bottom surface of the lower boss is located on the lower surface of the plate main body, and a hole for the steel bar bundles to pass through is formed in the lower boss along the length direction.
3. The fabricated prestressed composite box girder of claim 1, wherein: the web is whole steel sheet, including the straight section of ripple section and both sides, the bottom edge of ripple section is equipped with one row of mounting hole, and is equipped with a row of mounting hole along the board height direction on straight.
4. The fabricated prestressed composite box girder of claim 3, wherein: the connection reinforcing piece comprises a strip-shaped plate and a plurality of groups of studs fixedly connected to the strip-shaped plate; the connection reinforcing part is fixedly connected to the top of the web plate through a strip-shaped plate, and the stud extends into the post-pouring hole.
5. The fabricated prestressed composite box girder of claim 3, wherein: the mounting base is a T-shaped base and comprises a flat plate and a vertical plate, the vertical plate is a corrugated plate matched with the corrugated section, the vertical plate is provided with a through hole, and the vertical plate is fixedly connected to the flat plate; the flat plate is embedded in the bottom plate, the vertical plate extends to the upper surface of the bottom plate, and the web plate is fastened with the mounting base through a fastener penetrating through the mounting hole and the through hole.
6. The fabricated prestressed composite box girder of claim 4, wherein: the end plate is an assembly part and comprises a partition plate and a side plate; the partition plate and the side plates are rectangular plates, a pair of side plates are fixedly connected to the outer side of the partition plate, and connecting plates are arranged on the side plates; the end plates are arranged on the bottom plate and between two adjacent upper bosses, the two side plates are respectively connected with the corresponding web plates, one end of each connecting plate is connected with the strip-shaped plate, and the other end of each connecting plate is connected with the strip-shaped plate of the adjacent box girder unit to complete splicing.
7. The fabricated prestressed composite box girder of claim 6, wherein: the box girder unit is internally provided with a reinforcing transverse plate corresponding to the area between the two end plates, the reinforcing transverse plate is connected between the two webs, and the top of the reinforcing transverse plate is provided with a connecting plate to be connected with the strip-shaped plate to increase the connection reliability.
8. The fabricated prestressed composite box girder of claim 1, wherein: and epoxy resin is filled in a gap between every two adjacent box girder units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920916451.8U CN210507091U (en) | 2019-06-18 | 2019-06-18 | Assembled prestressed combined box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920916451.8U CN210507091U (en) | 2019-06-18 | 2019-06-18 | Assembled prestressed combined box girder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210507091U true CN210507091U (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920916451.8U Expired - Fee Related CN210507091U (en) | 2019-06-18 | 2019-06-18 | Assembled prestressed combined box girder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117931A (en) * | 2019-06-18 | 2019-08-13 | 中南大学 | Prefabricated PC combined box beam |
| CN111893884A (en) * | 2020-07-06 | 2020-11-06 | 湖北工业大学 | Asynchronous construction method for full-prefabricated assembled construction corrugated steel web bridge |
| CN112942052A (en) * | 2021-02-03 | 2021-06-11 | 江苏旭辰交通科技发展有限公司 | Fabricated combined box girder for constructing earthquake-resistant structure and construction method thereof |
| CN113062197A (en) * | 2021-03-31 | 2021-07-02 | 浙江师范大学 | Assembly type stiffening large cantilever corrugated steel web PC combined box girder and construction method thereof |
-
2019
- 2019-06-18 CN CN201920916451.8U patent/CN210507091U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117931A (en) * | 2019-06-18 | 2019-08-13 | 中南大学 | Prefabricated PC combined box beam |
| CN111893884A (en) * | 2020-07-06 | 2020-11-06 | 湖北工业大学 | Asynchronous construction method for full-prefabricated assembled construction corrugated steel web bridge |
| CN112942052A (en) * | 2021-02-03 | 2021-06-11 | 江苏旭辰交通科技发展有限公司 | Fabricated combined box girder for constructing earthquake-resistant structure and construction method thereof |
| CN113062197A (en) * | 2021-03-31 | 2021-07-02 | 浙江师范大学 | Assembly type stiffening large cantilever corrugated steel web PC combined box girder and construction method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200512 Termination date: 20210618 |
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| CF01 | Termination of patent right due to non-payment of annual fee |