CN110847041A - Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder - Google Patents
Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder Download PDFInfo
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- CN110847041A CN110847041A CN201911054700.8A CN201911054700A CN110847041A CN 110847041 A CN110847041 A CN 110847041A CN 201911054700 A CN201911054700 A CN 201911054700A CN 110847041 A CN110847041 A CN 110847041A
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- steel
- sleeve
- tooth block
- prefabricated section
- segmental
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- 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
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- 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
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- 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
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- 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
- E01D2101/30—Metal
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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 temporary anchoring structure for a segmental precast assembled concrete box girder, which is characterized in that a sleeve is pre-embedded in a segmental girder, bolt holes are arranged in the sleeve, and the openings of the bolt holes are upward and face the top of the segmental girder; the steel tooth block is installed on each prefabricated section beam, the steel tooth block is provided with a mounting hole and connected with the sleeve through a bolt, the steel tooth block is provided with a horizontal hole, and finish rolling twisted steel is stretched between the horizontal holes of the corresponding steel tooth blocks of the two adjacent prefabricated section beams to realize temporary anchoring. Through the structures and measures, the construction speed is greatly increased, the construction quality is guaranteed, and the overall landscape effect of the bridge is improved. The invention is a very practical and safe temporary anchoring scheme, and can be widely applied to the construction of the prefabricated segmental beam.
Description
Technical Field
The invention relates to the technical field of bridge structure design and construction, in particular to a temporary anchoring structure for a segmental precast assembled concrete box girder.
Background
At present, along with the rapid development of urban construction, the design and construction scheme of urban bridges increasingly attaches importance to rapid construction, construction quality, landscape effect and the like. The technology of the segmental precast assembled concrete box girder has the advantages of high construction speed, good construction quality, small influence on the existing traffic and the surrounding environment and the like, and is more and more widely applied to the concrete bridge girder structure. The technical scheme of the reliable temporary anchoring of the segmental assembling box girder is an important guarantee for improving the engineering quality and reducing the safety risk. According to survey, the currently mainly adopted temporary anchoring technical schemes mainly comprise the following steps: (1) and penetrating the top bottom plate by using a bolt, fixing the steel tooth block, and performing finish rolling on the twisted steel on the steel tooth block. The method has certain defects, and the main beam is provided with a plurality of bolt holes, so that the landscape is greatly influenced. (2) And adopting a reinforced concrete tooth block, and oppositely pulling and finish rolling the twisted steel on the concrete tooth block. And after the concrete tooth block is used, the concrete tooth block needs to be cut off, so that the construction is inconvenient. (3) The concrete shear cone is adopted, and the method needs to open a slot on the top and bottom plates and then backfill the slot after use. The method needs to cut off the steel bars of the main beam, is unfavorable for the stress of the main beam and has a complex construction process. The invention aims to solve the problems of the traditional temporary anchoring technical scheme by adopting a sleeve pre-embedding mode so as to achieve the purposes of good construction quality, high speed and good landscape effect.
Disclosure of Invention
The invention aims to provide a temporary anchoring structure for a segmental prefabricated assembled concrete box girder, which is suitable for segmental prefabricated assembled main girders and is convenient for temporary anchoring during main girder assembly construction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a temporary anchoring structure for a segmental precast assembled concrete box girder is characterized in that a sleeve is pre-embedded in a segmental girder, bolt holes are formed in the sleeve, and the openings of the bolt holes are upward and face the top of the segmental girder; the steel tooth block is installed on each prefabricated section beam, the steel tooth block is provided with a mounting hole and connected with the sleeve through a bolt, the steel tooth block is provided with a horizontal hole, and finish rolling twisted steel is stretched between the horizontal holes of the corresponding steel tooth blocks of the two adjacent prefabricated section beams to realize temporary anchoring.
Furthermore, a steel plate is welded below the sleeve, and the steel plate is welded with the transverse steel bar of the main beam in the prefabricated section beam, so that the sleeve is firmly anchored and accurately positioned.
Further, a leveling steel plate is arranged between the steel tooth block and the prefabricated section beam.
Furthermore, positioning steel bars are further arranged in the prefabricated section beams.
Further, when the section beam is poured, rubber sealing materials are arranged in the sleeve to prevent concrete from blocking the sleeve.
And after tensioning the girder steel bundle, removing the finish rolling twisted steel and the steel tooth block, and grouting and sealing the bolt hole.
The invention also aims to provide a temporary anchoring method for the segmental precast assembled concrete box girder, which is suitable for segmental precast assembled main girders and is convenient for temporary anchoring during main girder assembly construction.
In order to achieve the purpose, the technical scheme of the invention is as follows: a temporary anchoring method for a segmental precast assembled concrete box girder is characterized by comprising the following steps:
A. pre-burying a sleeve in the prefabricated section beam, wherein a bolt hole is formed in the sleeve, and the opening of the bolt hole is upward and faces to the top of the prefabricated section beam;
B. a steel tooth block is arranged on each prefabricated section beam, a mounting hole is formed in the bottom of each steel tooth block and connected with the sleeve through a bolt, and a horizontal hole is formed in each steel tooth block;
C. stretching finish rolling twisted steel between horizontal holes of the corresponding steel tooth blocks of two adjacent prefabricated section beams to realize temporary anchoring;
D. and after tensioning the girder steel bundle, removing the finish rolling twisted steel and the steel tooth block, and grouting and sealing the bolt hole.
The invention solves the problems of inconvenient temporary anchoring operation and poor stress by embedding the sleeve anchoring steel tooth block on the prefabricated section beam, greatly accelerates the construction speed and ensures the construction quality. Compared with the prior art, the invention has the following advantages and effects: firstly, a steel sleeve is embedded, a main beam does not need to be penetrated, and the appearance quality of the main beam is good; secondly, a pre-embedded steel sleeve is adopted, the diameter of the sleeve is smaller, the main beam steel bars do not need to be cut off, and the safety of the main beam is facilitated; thirdly, the steel tooth blocks are anchored by bolts, so that the construction speed is high; fourthly, a steel plate is welded under the sleeve, and the steel plate is welded with the main beam steel bar, so that the construction quality is guaranteed.
Drawings
Fig. 1 is a sectional view of a temporary anchoring of a sectional box girder.
Fig. 2 is a plan view of a temporary anchoring of a section of box girder.
Fig. 3 is an elevation view of the installation of the steel tooth block.
Fig. 4 is a sectional view a-a of fig. 3.
The figure includes: the steel tooth block 1, the sleeve 2, the steel plate 3, the structure parting 4, the finish rolling twisted steel 5, the high-strength bolt 6, the leveling steel plate 7, the main beam transverse steel bar 8, the main beam transverse steel bar and steel plate welding part 9 and the positioning steel bar 10.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a temporary anchoring scheme for a segmental precast assembled concrete box girder, which mainly comprises the following components: (1) the sleeve 2 is embedded in the prefabricated section beam; (2) a steel tooth block 1; (3) finish rolling the twisted steel 5, and the like. The main implementation process is as follows: (1) according to the section form of the main beam, the positions of the temporary anchoring tooth blocks are selected, as shown in fig. 1, the temporary anchoring tooth blocks are generally arranged on two sides of a web plate for symmetric anchoring, and the anchoring positions need to avoid the positions of the prestressed steel beams. (2) The sleeve 2 is embedded in the prefabricated segmental beam in advance, as shown in fig. 3, a steel plate 3 is welded below the sleeve 2, and the steel plate 3 is welded with the transverse steel bar 8 of the main beam, so that the sleeve is ensured to be anchored firmly and positioned accurately. (3) And rubber blocks are filled in the sleeve 2 to prevent cement paste from entering the sleeve when the segmental beam is poured. (4) And after the cast-in-place of the segmental beam is finished, the steel tooth block 1 is installed. (5) And hoisting the segment beam on the construction site, and stretching and fine rolling the twisted steel 5 for anchoring.
And a leveling steel plate 7 is arranged between the steel tooth block 1 and the prefabricated section beam. And positioning steel bars are also arranged in the prefabricated section beams. The leveling steel plate 7 has the function of ensuring the levelness of the steel tooth block 1, and the positioning steel bars ensure that the relative position of the embedded sleeve is unchanged.
By adopting the temporary anchoring technical design and the construction scheme, the steel sleeve is pre-embedded in advance, the sleeve is ensured to be anchored firmly and accurately positioned by measures such as welding a steel plate by the steel sleeve and welding the steel sleeve and the main beam steel bars, and then the aim of quick and safe construction is fulfilled by quickly installing the steel structure tooth blocks on site. Through the structures and measures, the construction speed is greatly increased, the construction quality is guaranteed, and the overall landscape effect of the bridge is improved. The invention is a very practical and safe temporary anchoring scheme, and can be widely applied to the construction of the prefabricated segmental beam.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (5)
1. A temporary anchoring structure for a segmental precast assembled concrete box girder is characterized in that a sleeve is pre-embedded in a segmental girder, bolt holes are formed in the sleeve, and the openings of the bolt holes are upward and face the top of the segmental girder; the steel tooth block is installed on each prefabricated section beam, the steel tooth block is provided with a mounting hole and connected with the sleeve through a bolt, the steel tooth block is provided with a horizontal hole, and finish rolling twisted steel is stretched between the horizontal holes of the corresponding steel tooth blocks of the two adjacent prefabricated section beams to realize temporary anchoring.
2. A temporary anchoring structure according to claim 1, wherein: the steel plate is welded below the sleeve, and the steel plate is welded with the transverse steel bar of the main beam in the prefabricated section beam, so that the sleeve is firmly anchored and accurately positioned.
3. A temporary anchoring structure according to claim 1, wherein: and a leveling steel plate is arranged between the steel tooth block and the prefabricated section beam.
4. A temporary anchoring structure according to claim 1, wherein: and positioning steel bars are also arranged in the prefabricated section beams.
5. A temporary anchoring method for a segmental precast assembled concrete box girder is characterized by comprising the following steps:
A. pre-burying a sleeve in the prefabricated section beam, wherein a bolt hole is formed in the sleeve, and the opening of the bolt hole is upward and faces to the top of the prefabricated section beam;
B. a steel tooth block is arranged on each prefabricated section beam, a mounting hole is formed in the bottom of each steel tooth block and connected with the sleeve through a bolt, and a horizontal hole is formed in each steel tooth block;
C. stretching finish rolling twisted steel between horizontal holes of the corresponding steel tooth blocks of two adjacent prefabricated section beams to realize temporary anchoring;
D. and after tensioning the girder steel bundle, removing the finish rolling twisted steel and the steel tooth block, and grouting and sealing the bolt hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054700.8A CN110847041A (en) | 2019-10-31 | 2019-10-31 | Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054700.8A CN110847041A (en) | 2019-10-31 | 2019-10-31 | Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder |
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| CN110847041A true CN110847041A (en) | 2020-02-28 |
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| CN201911054700.8A Pending CN110847041A (en) | 2019-10-31 | 2019-10-31 | Temporary anchoring structure and anchoring method for segmental prefabricated assembled concrete box girder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111335136A (en) * | 2020-03-23 | 2020-06-26 | 中国建筑土木建设有限公司 | External prestress structure of segment box girder and construction method thereof |
| CN111438816A (en) * | 2020-03-27 | 2020-07-24 | 苏交科集团股份有限公司 | Construction method of concrete combined box girder integral prefabricated wall type guardrail |
| CN111608084A (en) * | 2020-05-29 | 2020-09-01 | 中国铁建大桥工程局集团有限公司 | Integral prefabrication and assembly construction method for reinforced concrete arch bridge arch ring segments |
| CN115506239A (en) * | 2022-01-27 | 2022-12-23 | 浙江理工大学 | Temporary connecting piece of initial stage quick location |
-
2019
- 2019-10-31 CN CN201911054700.8A patent/CN110847041A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111335136A (en) * | 2020-03-23 | 2020-06-26 | 中国建筑土木建设有限公司 | External prestress structure of segment box girder and construction method thereof |
| CN111335136B (en) * | 2020-03-23 | 2022-03-25 | 中国建筑土木建设有限公司 | External prestress structure of segment box girder and construction method thereof |
| CN111438816A (en) * | 2020-03-27 | 2020-07-24 | 苏交科集团股份有限公司 | Construction method of concrete combined box girder integral prefabricated wall type guardrail |
| CN111608084A (en) * | 2020-05-29 | 2020-09-01 | 中国铁建大桥工程局集团有限公司 | Integral prefabrication and assembly construction method for reinforced concrete arch bridge arch ring segments |
| CN111608084B (en) * | 2020-05-29 | 2022-03-29 | 中国铁建大桥工程局集团有限公司 | Integral prefabrication and assembly construction method for reinforced concrete arch bridge arch ring segments |
| CN115506239A (en) * | 2022-01-27 | 2022-12-23 | 浙江理工大学 | Temporary connecting piece of initial stage quick location |
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