CN215714553U - Box girder steel bundle beam-end tensioning post-cast strip structure - Google Patents
Box girder steel bundle beam-end tensioning post-cast strip structure Download PDFInfo
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- CN215714553U CN215714553U CN202121949744.XU CN202121949744U CN215714553U CN 215714553 U CN215714553 U CN 215714553U CN 202121949744 U CN202121949744 U CN 202121949744U CN 215714553 U CN215714553 U CN 215714553U
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Abstract
The utility model provides a box girder steel bundle beam end tensioning post-pouring belt structure which comprises a box girder bridge pier and a box girder body, wherein a longitudinal steel bundle anchored at the end part of the girder body is arranged in the box girder body, and post-pouring belts are reserved at the end parts of two adjacent box girder bodies. Furthermore, post-cast strip department all is equipped with the pre-buried in the crossbeam structure along the bridge to reinforcing bar, vertical reinforcing bar to and the pre-buried horizontal reinforcing bar in cantilever department. For the tensioning of the longitudinal steel bundles between adjacent beam bodies of the urban viaduct, the reserved post-cast strips are respectively arranged at the end parts of two adjacent connected beam bodies on the pier top, so that the working space for tensioning the steel bundles is ensured, the longitudinal steel bundles of the beam bodies can extend into the beam ends, the stress of the whole structure is more reasonable, the adverse effect of the conventional top plate grooving on the end stress is avoided, and the construction progress can be accelerated; in order to enhance the connection and common stress of the post-cast strip and the beam body, the three-way embedded steel bars are arranged in advance, so that the integrity of the post-cast strip can be enhanced.
Description
Technical Field
The utility model belongs to the field of bridge construction, and particularly relates to a post-tensioning casting belt structure for a box girder steel bundle beam end.
Background
With the rapid development of economy in China and the continuous promotion of urbanization process, the demand for travel is higher and higher. The urban viaduct is used as an important component of a three-dimensional traffic system, provides convenience for urban fast travel, and is an indispensable infrastructure in the urban development process.
For the urban continuous beam bridge, the proper span is selected to effectively reduce the cost of a substructure and a foundation, so that a conventional equal-height prestressed concrete structure is mostly adopted. The viaduct is generally long in total length, reduces the space occupation for investment saving, is convenient to construct, and generally adopts a continuous beam structure, so that more bridge branches are easy to appear. And (3) performing construction according to the requirements during construction to finally form an integral viaduct system.
The prestress is used as an important link in the construction of the superstructure, and has great influence on the construction period. In order to make the continuous beam reasonably stressed, the longitudinal steel bundles in the beam body are usually arranged in a full length mode so as to provide enough resistance in the main stress direction of the bridge structure, and therefore the steel bundles mostly need to extend to the end portion of the beam. At the end part of the box girder, in order to ensure the driving comfort, usually, only an expansion joint space of about 10-16 cm is arranged between each sub-connection, and a space for stretching a steel beam is not provided, or the next connection construction is carried out after the construction of one connection bridge girder is finished, so that the construction period of the project is seriously influenced. In addition, a roof tensioning method is also adopted in the engineering, so that the construction of adjacent sub-connected bridges is not influenced mutually. However, the method has the disadvantages that the top plate is provided with a plurality of grooves, the structure is damaged greatly, the grooves are horizontally arranged, and the prestressed anchorage device is easily influenced by weather and damaged due to the fact that the prestressed anchorage device is soaked by rainwater. In addition, for a bridge with a part of beams with higher height and larger span, the end part of the beam body is bent to a top plate for tensioning in advance due to the steel beam, and the end part does not have a longitudinal steel beam, so that the stress of the beam body structure is easily adversely affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a post-tensioning casting belt structure for a box girder steel bundle girder end, so that a longitudinal steel bundle can penetrate through a box girder body, the box girder is stressed reasonably, the construction of adjacent girder bodies is not influenced mutually, and the construction progress is improved.
The technical scheme adopted by the utility model is as follows:
a box girder steel beam end tensioning post-cast strip structure comprises a box girder bridge pier and a box girder body, wherein a beam structure is arranged at the end part of the box girder body, and the box girder body is erected on the top of the box girder bridge pier through the beam structure at the end part;
longitudinal steel bundles anchored at the end parts of the beam bodies are arranged in the box beam bodies, and post-cast strips are reserved at the end parts of two adjacent box beam bodies.
Furthermore, post-cast strip department all is equipped with the pre-buried in the crossbeam structure along the bridge to reinforcing bar, vertical reinforcing bar to and the pre-buried horizontal reinforcing bar in cantilever department.
Furthermore, a small cantilever is reserved on the uppermost side of the post-cast strip.
Further, a manhole is arranged in the beam structure.
Further, the width of the post-cast strip is more than or equal to 0.5 m.
Furthermore, expansion joint preformed groove is arranged at the end part of the box girder body.
Further, the width of the post-cast strip is determined according to the width of the reserved slot of the expansion joint.
The utility model has the beneficial effects that:
for the tensioning of longitudinal steel bundles between adjacent beam bodies of the urban viaduct, the reserved post-cast strips are respectively arranged at the end parts of two adjacent beam bodies on the pier top, so that the working space for tensioning the steel bundles is ensured, the longitudinal steel bundles of the beam bodies can extend into the beam ends, the stress of the whole structure is more reasonable, the adverse effect of the conventional top plate grooving on the end stress is avoided, and the damage of bad weather such as rainwater and the like to the anchorage device in the top plate groove opening can be avoided due to the small cantilever. In order to enhance the connection and common stress of the post-cast strip and the beam body, the three-way embedded steel bars are arranged in advance, so that the integrity of the post-cast strip can be enhanced. The structure ensures that the construction procedures of adjacent beam bodies in the viaduct are not influenced mutually, and can ensure that the longitudinal steel bundles penetrate through the beam bodies, so that the stress of the structure is more reasonable; the influence of bad weather on the anchorage device is reduced, the construction is convenient, and the construction progress can be accelerated.
Drawings
FIG. 1 is an elevation view of a tensioned post-cast strip structure at a beam end of a steel bundle of a box girder according to an embodiment of the utility model.
FIG. 2 is a plan view of a post-tensioned casting strip structure at the beam end of the steel bundle of the box girder in the embodiment of the utility model.
In the figure: the method comprises the following steps of 1-box girder bridge pier, 2-box girder body, 3-box girder end part cross beam structure, 4-box girder longitudinal steel bundle, 5-longitudinal pre-embedded steel bars along the bridge direction, 6-post-cast strip, 7-vertical steel bars, 8-horizontal steel bars, 9-manhole, 10-box girder end expansion joint reserved notch and 11-small cantilever.
Detailed Description
The utility model will be further described with reference to the accompanying drawings in which:
for urban viaducts, when the number of the box girders of the upper structure is large and the number of the sub-bridges is large, in order to save the construction period, the processes of the different sub-bridge girders are not affected by each other. For the urban continuous beam bridge, the prestressed steel beams need to be arranged as long as possible so as to improve the integral stress performance of the urban continuous beam bridge. Therefore, in order to avoid mutual process influence at the beam end steel bundle tensioning place, a certain working space, namely a post-pouring zone, is reserved in the scheme, so that the construction progress can be accelerated, and the stress of the box beam is more reasonable.
The tensioning post-cast strip structure for the steel beam ends of the box beams in the embodiment of the utility model is shown in fig. 1 and 2 and comprises box beam piers 1, box beam bodies 2, box beam end beam structures 3 poured at the pier tops of the piers by the box beams, box beam longitudinal steel beams 4 needing to be anchored at the end parts in the beam bodies, and most key beams reserved post-cast strips 6.
In addition, 6 departments of post-cast strip still are equipped with pre-buried in the crossbeam along the bridge to embedded reinforcing bar 5, vertical reinforcement 7 to and pre-buried horizontal reinforcement 8 in cantilever department, simultaneously, set up manhole 9 in the crossbeam. The actual structure of the box girder can be combined, if the box girder needs to be grooved due to the expansion joint, the expansion joint reserved notch 10 at the end of the box girder is reserved when the post-cast strip 6 is poured, and the small cantilever 11 is reserved at the uppermost side of the box girder. The width of the post-cast strip 6 can be determined according to the width of the reserved notch.
The concrete box girder 2 is usually provided with a solid structure, namely a box girder end cross beam, at the bridge pier due to the arrangement of the support, so as to bear the concentrated load caused by the negative reaction force of the support. In order to ensure that the longitudinal prestressed steel beam 4 at the beam end can be smoothly tensioned and is not influenced by the process of the adjacent span structure, enough working space needs to be reserved in the adjacent two-bridge structure so that a jack of the steel beam and workers can normally work. Therefore, the post-cast strip 6 is reserved at the beam end, and the two connection beam bodies are respectively reserved, so that the space is increased, and the width of the single-side post-cast strip is reduced as much as possible. The concrete width of the expansion joint can be determined according to the width of the reserved notch of the expansion joint to be arranged on the beam body, and if the beam body is not provided with the reserved groove of the expansion joint, the width of the expansion joint can be arranged according to the working space and is generally not less than 0.5 m.
In addition, a small cantilever 11 is reserved on the uppermost side of the post-cast strip 6, so that the adverse effects of rainwater and the like on the anchorage device are reduced in the tensioning steel bundle maintenance time. The pre-embedded steel bars at the edge concrete of the post-cast strip are arranged in advance at the cross beam, so that the post-cast concrete can be better connected with the beam body and is integrally stressed. Considering the three-dimensional stress, the forward embedded steel bars 5, the vertical embedded steel bars and the horizontal embedded steel bars at the cantilever of the cross beam are arranged. And after the beam concrete is cured to the required strength, entering a space reserved in the post-cast strip from the top of the box girder or a manhole, tensioning the steel bundle, and then grouting. And binding the beam body reinforcing steel bars at the position of the post-cast strip 6 after the strength of the post-cast strip reaches the requirement, and pouring concrete. Whether the manhole 9 is closed or not can be determined according to the actual engineering requirements, and after the concrete strength of the post-cast strip 6 meets the requirements, the support is dismantled to complete the beam construction.
The scheme is realized as follows:
the concrete box girder body reserves a construction space for tensioning the longitudinal steel bundle at the cross beam at the pier end.
And post-cast strips are respectively arranged on two adjacent connecting beam bodies to form a section of working space along the bridge direction.
The width of the post-cast strip can be determined according to the specific required operation space and the width of the opening of the expansion joint reserved groove required to be arranged on the beam body.
In order to ensure the safe and reasonable structure of the support top at the pier, the post-cast strip needs to be cast for the second time after construction.
In order to ensure the connection effect of new and old concrete during secondary pouring, the three-way embedded steel bars are preset for overall stress.
In order to ensure that the anchor is not influenced by rainwater in the maintenance period after the steel bundle is tensioned, the post-cast strip is provided with a small cantilever.
And after the beam body and the post-cast strip are maintained, the support is detached, and the box beam construction is completed.
The post-cast strip structure for tensioning the beam ends of the box girder steel bundles enables a working space for prestress construction to be reserved between box girder bodies, construction procedures of all the sub-bridge girders are not affected mutually, the longitudinal steel bundles can extend to the beam ends and have enough space for normal tensioning, the beam bodies are guaranteed to be stressed reasonably, the structure is less affected, and beam end anchorage devices can be effectively protected. Meanwhile, the embedded steel bars are arranged, secondary concrete pouring is carried out on the post-cast strip, the integrity of new and old concrete is enhanced, the integral stress of the structure is reasonable, and the construction progress can be widened.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. A box girder steel beam end tensioning post-cast strip structure is characterized by comprising a box girder pier and a box girder body, wherein a beam structure is arranged at the end part of the box girder body, and the box girder body is erected on the top of the box girder pier through the beam structure at the end part;
longitudinal steel bundles anchored at the end parts of the beam bodies are arranged in the box beam bodies, and post-cast strips are reserved at the end parts of two adjacent box beam bodies.
2. A box girder steel bundle beam-end tensioning post-cast strip structure according to claim 1, wherein the post-cast strip is provided with a longitudinal reinforcement and a vertical reinforcement which are embedded in the beam structure, and a horizontal reinforcement which is embedded in the cantilever.
3. A box girder steel bundle beam-end tensioning post-cast strip structure according to claim 1, characterized in that a small overhang is reserved on the uppermost side of the post-cast strip.
4. A tension post-cast strip structure for a box girder steel bundle girder end according to claim 1, wherein a manhole is provided in the beam structure.
5. The tension post-cast strip structure for the beam end of the box girder steel strand according to claim 1, wherein the width of the post-cast strip is greater than or equal to 0.5 m.
6. A tension post-cast strip structure at the beam end of a box girder steel bundle according to claim 1, wherein an expansion joint reserved groove is formed at the end part of the box girder body.
7. A box girder steel bundle beam end tensioning post-cast strip structure according to claim 6, wherein the width of the post-cast strip is determined according to the width of the reserved groove of the expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121949744.XU CN215714553U (en) | 2021-08-19 | 2021-08-19 | Box girder steel bundle beam-end tensioning post-cast strip structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121949744.XU CN215714553U (en) | 2021-08-19 | 2021-08-19 | Box girder steel bundle beam-end tensioning post-cast strip structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302623A (en) * | 2022-08-26 | 2022-11-08 | 中铁十六局集团第三工程有限公司 | Narrow space beam end prestress tensioning process and continuous box girder structure |
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2021
- 2021-08-19 CN CN202121949744.XU patent/CN215714553U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302623A (en) * | 2022-08-26 | 2022-11-08 | 中铁十六局集团第三工程有限公司 | Narrow space beam end prestress tensioning process and continuous box girder structure |
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