CN211446624U - Device for improving concrete construction quality of prefabricated box girder tensioning notch - Google Patents
Device for improving concrete construction quality of prefabricated box girder tensioning notch Download PDFInfo
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- CN211446624U CN211446624U CN201922215080.3U CN201922215080U CN211446624U CN 211446624 U CN211446624 U CN 211446624U CN 201922215080 U CN201922215080 U CN 201922215080U CN 211446624 U CN211446624 U CN 211446624U
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- box girder
- slab staggering
- steel sheet
- precast box
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Abstract
The utility model provides an improve precast box girder stretch-draw notch concrete construction quality's device, including precast box girder bottom steel sheet, precast box girder tip slab staggering structure, slab staggering jacking structure and slab staggering hypoplastron all set up one set respectively at the both ends of precast box girder bottom steel sheet, precast box girder tip slab staggering structure is formed by a plurality of upper portion slab staggering assemblies, every upper portion slab staggering steel sheet below sets up a slab staggering jacking structure, the slab staggering hypoplastron be one with the steel sheet structure of precast box girder bottom steel sheet parallel and level. The device changes the stress condition of the end part of the prefabricated box girder, so that the stretching notch at the bottom of the prefabricated box girder is not stressed when the side span box girder is subjected to prestress stretching and releasing, thereby ensuring that the concrete weak link at the bottom of the box girder is not damaged, realizing the damage of the concrete at the end part in the stretching of the prestressed tendon of the prefabricated box girder, improving the preparation quality of the prefabricated box girder and realizing the delicate construction of the prefabricated box girder.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering equipment, in particular to improve precast box girder stretch-draw notch concrete construction quality's device.
Background
With the rapid growth of economy in China, the construction of bridge engineering is unprecedented, and the construction of precast box girders in large-span bridge engineering is widely applied. The quality of the precast box girder plays a vital role for the bridge, but the bottom tensioning slot concrete at the side span end of the precast box girder is easy to cause diseases due to various reasons and has serious conditions, and the damaged precast box girder is repaired to bring hidden troubles to the engineering and seriously affect the construction period.
In order to ensure the smooth production of the precast box girder and the engineering quality, how to improve the construction quality of the concrete of the stretch-draw notch at the bottom of the side span end of the precast box girder becomes a problem which needs to be solved urgently.
Disclosure of Invention
To the problem that exists, the utility model aims at improving precast box girder limit stride end bottom stretch-draw notch concrete construction quality, guarantee that precast box girder produces smoothly, ensures the engineering quality.
The utility model provides an improve precast box girder stretch-draw notch concrete construction quality's device, includes precast box girder bottom steel sheet, precast box girder tip slab staggering structure, slab staggering jacking structure and slab staggering hypoplastron all respectively set up one set at the both ends of precast box girder bottom steel sheet, precast box girder tip slab staggering structure is formed by a plurality of upper portion slab staggering assembly, and every upper portion slab staggering steel sheet below sets up a slab staggering jacking structure, the slab staggering hypoplastron be one with the steel sheet structure of precast box girder bottom steel sheet parallel and level.
Furthermore, the length and the width of the steel plate at the bottom of the precast box girder are both larger than the size of the bottom of the precast box girder.
Further, the length of the steel plate at the bottom of the prefabricated box girder is 30m, the width of the steel plate is 1.0-1.5 m, and the thickness of the steel plate is 20-30 mm.
Furthermore, the staggered platform jacking structure (3) is a jack structure.
The utility model discloses compare prior art's beneficial effect does:
the device through the reasonable design and the construction process who optimizes, change prefabricated box girder tip atress condition, prefabricated box girder bottom stretch-draw notch department is not atress when making the limit stride box girder prestressing force stretch-draw put to open to guarantee that box girder bottom concrete weak link is not damaged, realized the destruction of tip concrete in the prefabricated box girder prestressing tendons stretch-draw, improved the preparation quality of prefabricated box girder, realized the exquisite construction of prefabricated box girder.
Drawings
FIG. 1 is the structure schematic diagram of the device of precast box girder sidespan end bottom stretch-draw notch concrete construction quality.
Detailed Description
As shown in fig. 1, the embodiment provides a device for improving the construction quality of precast box girder tensioning slot concrete, which comprises a precast box girder bottom steel plate 1, a precast box girder end slab staggering structure 2, a slab staggering jacking structure 3 and a slab staggering lower plate 4. The bottom steel plate of the prefabricated box girder is made of a steel plate material with a certain thickness, the length and the width of the bottom steel plate are larger than the bottom size of the prefabricated box girder, and the bottom steel plate is used as a bottom formwork template of the prefabricated box girder in use; the end staggered platform structure, the staggered platform jacking structure and the staggered platform lower plate of the prefabricated box girder are respectively provided with a set at two ends of a bottom steel plate of the prefabricated box girder, the end staggered platform structure of the prefabricated box girder is formed by assembling a plurality of upper staggered platform steel plates, and is flush with the bottom steel plate of the prefabricated box girder in a working state in use and used as a section of template at the end part; a staggered platform jacking structure is arranged below each upper staggered platform steel plate, and the staggered platform jacking structure is a jack structure; the slab staggering lower plate is of a steel plate structure which is flush with the steel plate at the bottom of the prefabricated box girder.
The using method of the device comprises the following steps:
firstly, laying a steel plate at the bottom of a prefabricated box girder and binding a prefabricated box girder steel bar;
secondly, mounting a slab staggering structure at the end part of the precast box girder, a slab staggering jacking structure and a slab staggering lower plate, and enabling the slab staggering structure at the end part of the precast box girder to be flush with a steel plate at the bottom of the precast box girder through the jacking slab staggering jacking structure;
thirdly, pouring concrete, and curing to reach the tension design strength;
fourthly, removing the concrete side formwork, and removing the slab staggering structure, the slab staggering jacking structure and the slab staggering lower plate at the end part of the prefabricated box girder; and fifthly, pre-stress tensioning.
Claims (4)
1. The utility model provides an improve precast box girder stretch-draw notch concrete construction quality's device, a serial communication port, including precast box girder bottom steel sheet (1), precast box girder tip slab staggering structure (2), slab staggering jacking structure (3) and slab staggering hypoplastron (4) all respectively set up one set at the both ends of precast box girder bottom steel sheet (1), precast box girder tip slab staggering structure (2) are formed by a plurality of upper portion slab staggering steel sheet assemblings, and every upper portion slab staggering steel sheet below sets up one slab staggering jacking structure (3), slab staggering hypoplastron (4) are one with the steel sheet structure of precast box girder bottom steel sheet (1) parallel and level.
2. The arrangement according to claim 1, characterized in that the length and width of the precast box girder bottom steel plate (1) are larger than the precast box girder bottom dimension.
3. The device according to claim 2, wherein the prefabricated box girder bottom steel plate (1) has a length of 30m, a width of 1.0m to 1.5m and a thickness of 20mm to 30 mm.
4. The device according to claim 1, characterized in that the staggered jacking structure (3) is a jack structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215080.3U CN211446624U (en) | 2019-12-12 | 2019-12-12 | Device for improving concrete construction quality of prefabricated box girder tensioning notch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215080.3U CN211446624U (en) | 2019-12-12 | 2019-12-12 | Device for improving concrete construction quality of prefabricated box girder tensioning notch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211446624U true CN211446624U (en) | 2020-09-08 |
Family
ID=72306645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922215080.3U Active CN211446624U (en) | 2019-12-12 | 2019-12-12 | Device for improving concrete construction quality of prefabricated box girder tensioning notch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211446624U (en) |
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2019
- 2019-12-12 CN CN201922215080.3U patent/CN211446624U/en active Active
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