CN113338161A - Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof - Google Patents
Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof Download PDFInfo
- Publication number
- CN113338161A CN113338161A CN202110404999.6A CN202110404999A CN113338161A CN 113338161 A CN113338161 A CN 113338161A CN 202110404999 A CN202110404999 A CN 202110404999A CN 113338161 A CN113338161 A CN 113338161A
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- box girder
- concrete box
- top surface
- prestressed steel
- tensioning
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- 239000004567 concrete Substances 0.000 title claims abstract description 71
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000004873 anchoring Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 210000002435 tendon Anatomy 0.000 claims 5
- 238000004904 shortening Methods 0.000 abstract description 2
- 239000011513 prestressed concrete Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a prestressed steel bundle tensioning structure for the top surface of a concrete box girder and a construction method thereof. The invention changes the tension anchoring operation of the prestressed steel beams to the bridge deck slab, and the prestressed steel beams are intensively anchored on the top surface of the concrete box girder, thereby realizing the bridge deck tension anchoring of the prestressed steel beams, optimizing the construction conditions, improving the bridge construction speed, shortening the construction period, saving the construction cost, and realizing the simultaneous construction of front and rear bridges. The invention stretches the prestressed steel beam on the bridge floor, the stretching equipment is convenient to transfer, the construction efficiency and the construction safety are improved, the construction quality is ensured, and the sealing anchor of the prestressed steel beam is carried out on the top surface of the concrete box girder, so that the sealing anchor quality is improved.
Description
Technical Field
The invention belongs to a prestressed steel beam tensioning technology of a prestressed concrete cast-in-place continuous box girder bridge, and particularly relates to a prestressed steel beam tensioning structure of a concrete box girder top surface and a construction method of the prestressed steel beam tensioning structure of the concrete box girder top surface.
Background
The road construction in China realizes the leap-type development and obtains remarkable achievement. With the development of high-grade roads and the three-dimensional construction process of urban traffic, the prestressed concrete cast-in-place continuous box girder bridge is increasingly adopted in the construction of urban bridges and interchange overpasses due to the advantages of good integrity, strong spanning capability, strong applicability, simple and attractive bridge shape and the like.
However, in the existing construction of the prestressed concrete cast-in-place continuous box girder bridge, the situation that all the bridges cannot be simultaneously cast-in-place construction due to the fact that a single-seat bridge is large in size and large in number of the bridges and limited by a beam end prestressed steel beam tensioning space often occurs, and construction is slow.
Under the condition that the tensioning space of the pre-and post-bridging prestressed steel bundles is not influenced, the conditions for simultaneously constructing all the full bridges are met, and the structural stress rationality can be considered, so that the construction period is saved, which is a technical problem to be solved urgently in the industry at present.
Disclosure of Invention
The invention aims to provide the prestressed steel beam tensioning structure for the top surface of the concrete box girder, which has the advantages of reasonable structural stress, construction quality guarantee, engineering cost saving, simplicity and rapidness in construction and capability of realizing simultaneous construction of front and rear bridges.
The first object of the invention is achieved by the following technical measures: the utility model provides a concrete box girder top surface prestressing force steel beam stretch-draw structure, its characterized in that, it includes bellows and prestressing steel beam, sets up flutedly in the top surface both sides of concrete box girder and the position corresponding to its web, the bellows is along vertical pre-buried in the web of concrete box girder, prestressing steel beam wears to establish in the bellows, and its one end anchor, the other end is held as the stretch-draw and is stretched to in the recess and through the anchor behind the stretch-draw.
The invention changes the stretching anchoring operation of the prestressed steel beams to the bridge deck slab, and the prestressed steel beams are intensively anchored on the top surface of the concrete box girder, thereby realizing the bridge deck stretching anchoring of the prestressed steel beams, solving the problem of mutual interference of the beam end prestress stretching between adjacent bridges, optimizing the construction conditions, obviously improving the bridge construction speed, shortening the construction period, saving the construction cost, and realizing simultaneous construction of front and rear bridges. The prestressed steel beam is tensioned on the bridge floor, the tensioning equipment is convenient to transfer, the construction efficiency can be improved, the construction safety is improved, the construction quality is ensured, and the anchor sealing quality can be effectively improved by performing anchor sealing on the prestressed steel beam on the top surface of the concrete box girder.
In a preferred embodiment of the present invention, both ends of the prestressed steel strand are anchored by an anchor provided at a pipe end of the corrugated pipe.
The anchorage device, the corrugated pipe and the prestressed steel bundles are divided into a plurality of groups, each group is vertically arranged in a web plate of the concrete box girder, and the tensioning ends of the prestressed steel bundles of each group are longitudinally arranged in the grooves. The diameter of the corrugated pipe can be determined according to the number of the prestressed steel bundles required to be arranged in the corrugated pipe.
As a recommended embodiment of the present invention, a plurality of step-shaped fixing seats are disposed in the groove, each group of anchors, corrugated pipes, and prestressed steel bundles corresponds to each fixing seat, and the tension end of each group of prestressed steel bundles is parallel to the top surface of the corresponding fixing seat and penetrates through the end surface of the fixing seat to be anchored.
The width of the fixing seat is not larger than that of a concrete box girder web, and the specific width of the fixing seat can be determined according to the requirement of a horizontal space for tensioning a prestressed steel beam.
The concrete box girder is a cast-in-place concrete box girder.
The corrugated pipe is a plastic corrugated pipe or a metal corrugated pipe.
The second purpose of the invention is to provide a construction method of the concrete box girder top surface prestress steel bundle tensioning structure.
The second object of the invention is achieved by the following technical measures: the construction method of the concrete box girder top surface prestress steel beam tensioning structure is characterized by comprising the following steps of:
s1, installing a support and a template of the concrete box girder, binding reinforcing steel bars, and pre-embedding a corrugated pipe and an anchorage device connected to the pipe end of the corrugated pipe at a position corresponding to a web plate of the concrete box girder;
s2, arranging grooves on two sides of the top surface of the concrete box girder by adopting templates;
s3, casting the concrete box girder in situ, and curing until the concrete box girder meets the design strength requirement;
s4, penetrating the prestressed steel beam into the corrugated pipe, anchoring one end of the prestressed steel beam, extending the other end of the prestressed steel beam into the groove as a tensioning end, tensioning the prestressed steel beam at the tensioning end, and anchoring the tensioning end on an anchorage device;
s5, grouting into the corrugated pipe and sealing the anchor;
and S6, pouring concrete into the groove.
Compared with the prior art, the invention has the following remarkable effects:
the top surface of the concrete box girder is provided with the groove, so that bridge deck tensioning and anchoring of prestressed steel bundles are realized, the problem of mutual interference of beam end prestress tensioning and pulling between adjacent bridges is avoided, construction conditions are optimized, the bridge construction speed is remarkably improved, the construction period is shortened, the engineering cost is saved, and simultaneous construction of front and rear bridges can be realized.
According to the invention, the prestressed steel beams can be tensioned on the bridge floor, the tensioning equipment is convenient to transfer, the construction efficiency can be improved, the construction safety is improved, and the construction quality is ensured.
According to the invention, during construction, the prestressed steel beam sealing anchor is carried out on the top surface of the concrete box girder, so that the anchor sealing quality can be effectively improved.
Drawings
The invention is described in further detail below with reference to the figures and the specific embodiments.
FIG. 1 is a perspective view of the present invention in perspective;
fig. 2 is a cross-sectional view of the present invention.
Detailed Description
As shown in fig. 1 and 2, the prestressed steel beam tension structure for the top surface of a concrete box girder according to the present invention is provided on the concrete box girder 1, the concrete box girder 1 includes a pair of web plates 6, a top plate 7 and a bottom plate 8, upper and lower ends of the pair of web plates 6 are respectively connected with both sides of the top plate 7 and the bottom plate 8 to form a hollow portion 10 of the concrete box girder 1, portions of the top plate 7 extending to both sides form flange plates 9, and connecting portions between the components are provided with chamfers. The concrete box girder 1 is constructed by adopting a template in a cast-in-place mode.
The prestressed steel beam tensioning structure for the top surface of the concrete box girder comprises an anchorage device 4, a corrugated pipe 2 and prestressed steel beams 5, wherein the corrugated pipe 2 is a plastic corrugated pipe or a metal corrugated pipe, and the diameter of the corrugated pipe 2 is determined according to the number of the penetrated prestressed steel beams. Grooves 3 are formed in the two sides of the top surface of the concrete box girder 1 and correspond to the positions of the web plates 6, in the embodiment, one groove 3 is formed in each side of the top surface of the concrete box girder 1, and the grooves 3 are located at one end of the top surface of the concrete box girder. Bellows 2 is along vertical pre-buried in the web 6 of concrete box girder 1, and bellows 2 extends towards the both ends of concrete box girder top surface promptly, and ground tackle 4 is pre-buried at the both ends of bellows 2, and prestressing steel 5 wears to establish in bellows 2, and its one end is through the ground tackle anchor of locating this pipe end of bellows, and the other end is held as the stretch-draw and is stretched to in the recess 3 and through the anchor 4 anchor of locating this pipe end of bellows 2 after the stretch-draw.
The anchorage 4, the corrugated pipe 2 and the prestressed steel bundles 5 are provided in several groups, in this embodiment, three groups are respectively provided in a pair of webs 6 of the concrete box girder 1, the three groups are vertically arranged in the webs 6 of the concrete box girder 1, and the tensioning ends of the prestressed steel bundles 5 of each group are longitudinally arranged in the grooves 3. Be equipped with the fixing base of a plurality of step-like in the recess 3, the width of fixing base is not more than the width of 1 web 6 of concrete box girder, and in practical application, the width of fixing base can be confirmed according to the horizontal space demand of prestressing force steel beam stretch-draw. Each group of anchorage devices 4, the corrugated pipe 2 and the prestressed steel bundles 5 correspond to each fixing seat, the tensioning end of each group of prestressed steel bundles 5 is parallel to the top surface 11 of the corresponding fixing seat and penetrates out of the end surface 12 of the fixing seat for anchoring, and in the embodiment, the end surface, through which the uppermost prestressed steel bundle 5 penetrates out, is the groove wall at one end of the groove 3.
The concrete box girder 1, the corrugated pipe 2, the groove 3, the anchorage 4 and the prestressed steel beam 5 are combined into a whole to form a stable prestressed structure.
In practical application, the specific number of the grooves on the top surface of the concrete box girder is determined according to the number of the prestressed steel bundles, and the specific opening position and angle of the grooves on the top surface of the concrete box girder are determined according to the line type of the prestressed steel bundles.
A construction method of the concrete box girder top surface prestress steel bundle tensioning structure comprises the following steps:
s1, installing a support and a template of the concrete box girder 1, binding reinforcing steel bars, and pre-embedding the corrugated pipe 2 and the anchorage device 4 connected with the pipe end of the corrugated pipe 2 at a position corresponding to the web 6 of the concrete box girder 1;
s2, arranging grooves 3 on two sides of the top surface of the concrete box girder 1 by adopting templates;
s3, the cast-in-place concrete box girder 1 is cured until the design strength requirement is met;
s4, the prestressed steel beam 5 is arranged in the corrugated pipe 2 in a penetrating mode, one end of the prestressed steel beam is anchored, the other end of the prestressed steel beam serves as a tensioning end and extends into the groove 3, the prestressed steel beam 5 is tensioned at the tensioning end, and then the tensioning end is anchored on the anchorage device 4;
s5, grouting into the corrugated pipe 2 and sealing the anchor;
and S6, pouring concrete into the groove 3.
And constructing a bridge deck waterproof layer, paving asphalt, installing auxiliary facilities and the like to finish the construction of the concrete box girder top surface structure.
The embodiments of the present invention are not limited thereto, and according to the above-mentioned contents of the present invention, the present invention can be modified, substituted or changed in other various forms without departing from the basic technical idea of the present invention.
Claims (8)
1. The utility model provides a concrete box girder top surface prestressing force steel bundle tensioning texture which characterized in that: it includes bellows and prestressing steel bundle, sets up flutedly in the top surface both sides of concrete box girder and the position that corresponds to its web, the bellows is along vertical pre-buried in the web of concrete box girder, prestressing steel bundle wears to establish in the bellows, and its one end anchor, the other end as stretch-draw end extend in the recess and through the anchor behind the stretch-draw.
2. The concrete box girder top surface prestress tendon tensioning structure according to claim 1, wherein: and two ends of the prestressed steel bundles are anchored through an anchorage device arranged at the end of the corrugated pipe.
3. The concrete box girder top surface prestress tendon tensioning structure according to claim 2, wherein: the anchorage devices, the corrugated pipes and the prestressed steel beams are divided into a plurality of groups, each group is vertically arranged in a web plate of the concrete box girder, and the tensioning ends of the prestressed steel beams of each group are longitudinally arranged in the grooves.
4. The concrete box girder top surface prestressed tendon tensioning structure according to claim 3, wherein: the groove is internally provided with a plurality of step-shaped fixed seats, each group of anchorage devices, corrugated pipes and prestressed steel bundles correspond to each fixed seat, and the tensioning end of each group of prestressed steel bundles is parallel to the top surface of the fixed seat corresponding to the prestressed steel bundles and penetrates out of the end surface of the fixed seat for anchoring.
5. The concrete box girder top surface prestress tendon tensioning structure according to claim 4, wherein: the width of the fixing seat is not larger than that of the concrete box girder web.
6. The concrete box girder top surface prestress strand tensioning structure according to any one of claims 1 to 5, wherein: the concrete box girder is a cast-in-place concrete box girder.
7. The concrete box girder top surface prestressed tendon tensioning structure according to claim 6, wherein: the corrugated pipe is a plastic corrugated pipe or a metal corrugated pipe.
8. A construction method of a concrete box girder top surface prestress strand tensioning structure according to any one of claims 1 to 7 is characterized by comprising the following steps:
s1, installing a support and a template of the concrete box girder, binding reinforcing steel bars, and pre-embedding a corrugated pipe and an anchorage connected to the end of the corrugated pipe at a position corresponding to a web plate of the concrete box girder;
s2, arranging grooves on two sides of the top surface of the concrete box girder by adopting templates;
s3, casting the concrete box girder in situ, and curing until the concrete box girder meets the design strength requirement;
s4, penetrating the prestressed steel beam into the corrugated pipe, anchoring one end of the prestressed steel beam, extending the other end of the prestressed steel beam into the groove as a tensioning end, tensioning the prestressed steel beam at the tensioning end, and anchoring the tensioning end on an anchorage device;
s5, grouting into the corrugated pipe and sealing the anchor;
and S6, pouring concrete into the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404999.6A CN113338161A (en) | 2021-04-15 | 2021-04-15 | Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110404999.6A CN113338161A (en) | 2021-04-15 | 2021-04-15 | Concrete box girder top surface prestress steel beam tensioning structure and construction method thereof |
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| CN113338161A true CN113338161A (en) | 2021-09-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113897862A (en) * | 2021-09-29 | 2022-01-07 | 中电建路桥集团有限公司 | Semi-rigid base pavement maintenance structure |
| CN114263121A (en) * | 2022-01-13 | 2022-04-01 | 中工武大设计集团有限公司 | Prestressed steel beam tensioning structure in concrete box girder structure system conversion and construction method |
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| CN110878609A (en) * | 2019-12-03 | 2020-03-13 | 上海宝冶集团有限公司 | Construction method of unbonded prestressed waffle slab |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030182883A1 (en) * | 2001-05-04 | 2003-10-02 | Won Dae Yon | Prestressed composite truss girder and construction method of the same |
| CN201087321Y (en) * | 2007-07-31 | 2008-07-16 | 中铁二局股份有限公司 | Prestressed concrete pretensioning box beam prefabricated force transmission column |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113897862A (en) * | 2021-09-29 | 2022-01-07 | 中电建路桥集团有限公司 | Semi-rigid base pavement maintenance structure |
| CN114263121A (en) * | 2022-01-13 | 2022-04-01 | 中工武大设计集团有限公司 | Prestressed steel beam tensioning structure in concrete box girder structure system conversion and construction method |
| CN114263121B (en) * | 2022-01-13 | 2023-07-04 | 中工武大设计集团有限公司 | Prestressed steel beam tensioning structure in concrete box girder structure system transformation and construction method |
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Application publication date: 20210903 |