CN109853398B - Temporary pre-stressing structure for prefabricated segment assembly bridge - Google Patents
Temporary pre-stressing structure for prefabricated segment assembly bridge Download PDFInfo
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- CN109853398B CN109853398B CN201910273512.8A CN201910273512A CN109853398B CN 109853398 B CN109853398 B CN 109853398B CN 201910273512 A CN201910273512 A CN 201910273512A CN 109853398 B CN109853398 B CN 109853398B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 239000011148 porous material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 22
- 238000009434 installation Methods 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 19
- 238000004873 anchoring Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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Abstract
The invention belongs to the technical field of bridge construction, and particularly relates to a temporary pre-stress structure for a prefabricated segment spliced bridge. Grooves are formed in the edges, intersecting with the cross section, of the outer surfaces of the top plate, the bottom plate and/or the web plate of the existing bridge segment, and penetrate through the outer surfaces and the cross section; the groove is internally provided with a pressure-bearing surface for tensioning temporary prestress; corresponding grooves on the front side and the rear side of the segment are communicated through temporary pre-stress pore canals, and a tensioning screw rod passes through the grooves. The invention has the advantages that the temporary prestress pore canal and the groove are reserved on the segment, the positioning hole is longitudinally opened on the beam body for installing the temporary prestress steel gear, and the risk of damaging the structure of the beam body is avoided; and meanwhile, when the reserved channel is poured, steel bars are put into the reserved channel to connect adjacent section beams, so that the integrity of the whole collapsed beam is ensured. And save traditional installation and demolish the steel gear bank and fill the step of trowelling locating hole by one, practiced thrift the engineering time greatly.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a temporary pre-stress structure for a prefabricated segment spliced bridge.
Background
The construction method for prefabricating and assembling segments includes dividing the upper structure of bridge into several standard segments, after prefabricating, assembling the segments on the lower structure of bridge in site with special assembling equipment, such as bridge girder erection machine, and applying prestress to form integral structure.
The method is suitable for construction of superstructure box beams or channel beams such as middle span (30-50 m), long total length of bridges, offshore, large-scale rivers and lakes, mountain bridges, urban overhead, light rails and the like; and the construction with a compact construction period is most suitable.
In the whole span segment assembling process, a temporary prestress needs to be applied for tightly connecting adjacent segments before the permanent prestress construction of the structure. The temporary prestress can ensure the tight connection between adjacent sections when being assembled, prevent the sections from misplacement, and ensure that compressive stress exists at the joint, thereby ensuring that the adhesive smeared at the joint is reliable and effective. When the bridge is in a bridge-forming state after the permanent prestressing force is applied, the temporary prestressing force can be removed.
The conventional temporary prestressing method is to temporarily fix a set of steel ridges on each segmental beam. The steel tooth bars are fastened and connected with the reserved holes on the top plate or the bottom plate of the bridge by high-strength bolts. And then, a group of corresponding steel tooth bars on two adjacent section beams are connected through a long screw rod, and the two ends are tensioned and fastened, so that temporary compressive stress is applied to the spliced section, the two section beams are tightly attached together, and preparation is made for applying permanent prestress later.
And then removing the tensioning screw rod and removing the steel gear ridge. The method needs additional steel gear assistance, and holes for passing through are reserved on the permanent structures of the section beams, so that the local strength of the top and bottom plate structures of the bridge is affected, and hidden danger is caused to the durability of the bridge.
The main bridge structure section comprises a bridge with a box section, and the vehicle load of the bridge is positioned on the top surface of the box structure; the channel section (also referred to as a U-section in recent years) has its vehicle load located on the floor.
Disclosure of Invention
The invention aims to provide a temporary pre-stressing structure for a prefabricated segment spliced bridge, which is simple in structure, low in cost and convenient to construct.
The temporary pre-stressing structure for the prefabricated segment spliced bridge is based on the existing bridge segment structure. The existing bridge segment structure comprises a top plate, a bottom plate and a web plate, and a section 2 spliced between the segments; wherein:
grooves 3 are formed in the edges of the outer surfaces 1 of the top plates, the bottom plates and/or the webs of the sections intersecting the section 2, and the grooves 3 penetrate through the outer surfaces 1 and the section 2; one surface of the groove 3 is parallel to the section 2 and is used as a pressure-bearing surface 4 for tensioning temporary prestress;
corresponding grooves 3 are arranged at the sections 2 of the front side and the rear side of the segment; the two corresponding grooves 3 are communicated through a temporary pre-stress pore canal 6 which is arranged in the section and penetrates through the section, the temporary pre-stress pore canal 6 is perpendicular to the pressure bearing surface 4, and an opening is arranged on the pressure bearing surface 4 for a tensioning screw 7 to pass through;
the temporary pre-stressing tunnels 6 avoid permanent pre-stressing tunnels.
In the invention, the pressure bearing surface 4 is also provided with a steel backing plate 5 for dispersing local pressure; the steel backing plate 5 is correspondingly provided with an opening for the tension screw 7 to pass through at a position corresponding to the temporary pre-stress pore canal 6.
In the invention, a plurality of grooves 3 can be arranged on each side according to construction requirements.
In the present invention, the outer surface 1 is the top or bottom surface of the top plate, the top or bottom surface of the bottom plate, and the side surface of the web.
In the invention, a tensioning screw rod 7 is arranged in a temporary prestress pore canal 6 of one segment, the tensioning screw rod 7 is provided with external threads, the tensioning screw rods 7 of two adjacent segments are connected through a screw rod connector 9, the screw rod connector 9 is in a long tubular shape, and the pipe wall is internally provided with internal threads matched with the external threads of the tensioning screw rod 7; the tensioning screw rod 7 is also provided with an anchor nut 8, and the anchor nut 8 is tightly clung to the steel backing plate 5 and is screwed down.
In the invention, the diameter of the temporary pre-stress pore canal 6 is larger than the diameter of the screw connector 9 and smaller than the outer diameter of the anchor nut 8, so that the tension screw 7 can be conveniently pulled out during the dismantling process.
When the invention is used, a plurality of sections are spliced and formed in sequence, a tension screw 7 is used for penetrating through the prestressed duct, one tension screw 7 is inserted into the temporary prestressed duct of each section, and the tension screw 7 is connected with the previous section screw by using a screw connector in the butt joint groove of two adjacent sections; tensioning the tensioning screw rods 7 in the grooves of each section beam, tensioning to a preset tensile force through a jack after the installation is completed, then tightening by using the anchor nuts 8, and tightly attaching the inner side surfaces of the anchor nuts 8 to the steel backing plates on the bearing surfaces, wherein the steel backing plates further provide supporting force for the anchor nuts 8; the anchoring nut 8 on one side of the spliced segment is continuously screwed down to provide temporary prestress between the segments, so that the required compressive stress is achieved between the segments.
And finally, after all the sections of the bridge to be spliced are spliced, carrying out permanent prestress tensioning. After the permanent prestress tensioning is completed, the screw connector is screwed and disassembled, the anchor nut 8 is removed from the groove, and the tensioning screw 7 is pulled out.
After the permanent prestress tensioning construction is finished, cement mortar is filled in the temporary prestress pore canal, so that the construction is convenient compared with the vertical opposite perforation, and the hidden danger of filler falling does not exist;
or the temporary pre-stress pore canal can be left in the structure without filling, so that the maintenance of the post-reinforcing pre-stress again is facilitated. If the bridge is operated for a plurality of years, the permanent prestress needs to be reinforced due to factors such as vibration, aging and the like; so that the groove can be used again, and a tensioning screw rod can be inserted for reinforcing prestress; and the steel gear is not required to be additionally arranged, so that the maintenance of the bridge in the later stage is greatly facilitated.
The invention has the advantages that temporary pre-stress pore channels and grooves are reserved at the top plate, the bottom plate and/or the web plate of the section, so that the positioning holes are longitudinally formed in the beam body for mounting the temporary pre-stress steel tooth bank are removed, and the risk of damaging the structure of the beam body is avoided; moreover, the longitudinal holes are not formed, so that the longitudinal holes do not need to be filled, and the risk that the longitudinal fillers fall under the action of gravity after a long time is avoided; and meanwhile, when the reserved channel is poured, steel bars are put into the reserved channel to connect adjacent section beams, so that the integrity of the whole collapsed beam is ensured. And save traditional installation and demolish the steel gear bank and fill the step of trowelling locating hole by one, practiced thrift the engineering time greatly.
Drawings
FIG. 1 is a schematic view of the structure of a single segment in example 1.
Fig. 2 is an enlarged schematic view of the area a in fig. 1.
FIG. 3 is a schematic view of the steel gasket plate of example 1.
Fig. 4 is a schematic top view of a three-segment splice of example 1.
Fig. 5 is an enlarged schematic view of the area B in fig. 4.
Reference numerals in the drawings: 1 is an outer surface, 2 is a section, 3 is a groove, 4 is a pressure bearing surface, 5 is a steel backing plate, 6 is a temporary pre-stress duct, 7 is a tensioning screw, 8 is an anchor nut, and 9 is a screw connector.
Detailed Description
Example 1
The method comprises the steps of selecting a U-shaped section beam with two webs, wherein the sections are formed by integrally casting concrete, and the precast section of the concrete beam is divided into a bottom plate and a flange plate (web), wherein the length of the beam is 29.4m, the height of the beam is 2.2m, the top width is 9.928m, and the bottom width is 7.706m; the two flange plates are respectively arranged at the two ends of the bottom plate, and the support adopts a beam double-point support. Each bridge consists of 10 segments of beams, each about 40t.
The plane of the upper surface of the bottom plate and the plane of the top end part of the web plate are taken as the outer surface 1, and are grooved at the intersection position of the plane and the cross section 2 to form a cube groove 3 penetrating through the outer surface 1 and the cross section 2; the recess 3 is a rectangular parallelepiped (without a top end face and a front end face).
Only one vertical face (namely the rear end face of the cuboid) in the groove 3 is parallel to the section 2 and is used as a pressure bearing face 4; a concave table is arranged on the pressure-bearing surface 4; the steel backing plate 5 is preset on the pressure bearing surface 4, a boss matched with the concave table is arranged on one surface of the pressure bearing surface 4, the boss is integrally formed with the steel backing plate 5 and embedded in the concave table, and when the steel backing plate 5 is arranged on the pressure bearing surface 4, the position of the steel backing plate 5 is fixed by the concave table and cannot be misplaced due to external force. The pressure-bearing surface 4 is provided with an opening for the passage of a tensioning screw 7, and the diameter of the opening is smaller than that of the temporary pre-stressing pore canal 6.
The steel backing plate 5 is integrally formed on the pressure bearing surface 4 during segmental casting.
The temporary prestressed duct 6 is also integrally formed in the preset section during pouring; the temporary prestressed duct 6 is perpendicular to the section 2, namely perpendicular to the bearing surface 4, and is used for the tensioning screw 7 and the steel bars to pass through; the opening of the temporary pre-stress pore canal 6 is positioned on the pressure bearing surface 4; the temporary pre-stressing tunnels 6 avoid permanent pre-stressing tunnels. The diameter of the temporary pre-stress pore canal 6 is larger than that of the screw connector 9 and smaller than that of the anchoring nut 8, and the tension screw 7 is conveniently pulled out during dismantling.
One groove 3 is arranged on each side of the two webs, and two grooves 3 are arranged on each side of the bottom plate.
During construction, the segments are spliced in sequence, and after the two segments are spliced, a tensioning screw rod 7 is inserted into each segment; screwing each anchor nut 8 from the same end of each tensioning screw 7 into the groove 3, and tightly attaching the anchor nuts to the steel backing plate 5;
simultaneously, two tensioning screws 7 are connected in the butted groove 3 through screw connectors 9; the screw connector 9 is in a long pipe shape, a through hole is arranged in the middle of the screw connector, and an internal thread matched with the external thread of the tensioning screw 7 is arranged in the through hole; the two tensioning screws 7 are respectively screwed into the two ends of the screw connector 9 to achieve a fixed connection state.
Specifically:
the first segment is screwed down with an anchor nut 8 at the position of the (front cross-section) groove 3 of the first cross-section 2;
the first segment is screwed with an anchor nut 8 at the position of the (rear cross-section) groove 3 of the second cross-section 2;
tensioning screws 7 on the first section and the second section are screwed and connected through screw connectors 9; then, the second section is stretched to a preset tension value by arranging a jack at the position of the groove 3 of the second section 2 (the rear section); the anchoring nut 8 is screwed down to provide temporary prestress between the segments;
thereby completing the splicing of the first and second two-piece segments.
Similarly, the third section is spliced with the second section, the third section is stretched to a preset tensile force by arranging a jack at the position of the groove 3 of the second section 2 (the rear section), and then the anchoring nut 8 is screwed down to provide temporary prestress for the sections, so that the second section and the third section are spliced.
All the sections are connected in the same way, the tensioning screw rods 7 are spliced in sequence, the tensioning screw rods 7 are butted in the same way, the tensioning screw rods are tensioned to a preset tensile force through the jack, and then the anchor nuts 8 are tightened and fixed.
And after the construction such as splicing and the like of the final integral bridge segment beam is completed, setting a permanent tensioning screw rod 7 in the permanent pre-stress pore canal, removing an anchor nut 8 in the groove 3 after the permanent pre-stress fastening is carried out, removing a screw rod connector 9, and extracting the tensioning screw rod 7. And then, connecting steel bars are placed in the temporary prestressed duct, and reserved grooves are poured and filled up, so that the construction of the large bridge pavement can be performed.
Example 2
The box-shaped segmental beams are selected and integrally cast, each span beam consists of 10 segmental beams, and each segmental beam is about 40t.
Grooving the intersection position of the outer surface 1 of the upper part of the bottom plate and the section 2, and grooving the intersection position of the outer surface 1 of the upper part of the top plate and the section 2, so as to form a cube groove 3 penetrating through the outer surface 1 and the section 2; the rest of the structure and construction are the same as in example 1.
After the construction such as splicing is completed on each section of the integral bridge, the length of the bridge section beam group is longer after permanent prestress fastening, the screw connector 9 can be removed from the middle groove 3 in a segmented mode, and then the respective tension screws are directly extracted from the groove 3 by utilizing the deformable characteristic of the long screws. And then, connecting steel bars are placed in the temporary prestressed duct, and reserved grooves are poured and filled up, so that the construction of the large bridge pavement can be performed.
In the invention, when the tensioning construction is carried out, the possibility of stress failure of the anchor nuts is considered, and the whole tensioning construction can be carried out after all the anchor nuts far away from the tensioning side on the prefabricated section are unscrewed. And after the tensioning construction is completed, the anchor nuts are tightened again. The anchor nuts on each prefabricated segment near the tension side are then inspected. The tightening operation is performed again on these anchor nuts, if necessary.
Moreover, during the life of the bridge, its permanent prestressing may be weakened, so that it is necessary to supplement the permanent prestressing of the tensioning; therefore, the original groove 3 can be directly utilized to apply the new permanent prestress, so that the stress level of the structure is readjusted, steel gear is not required to be perforated again, and the convenience of bridge maintenance and reinforcement is improved.
The invention is equally applicable to other types of concrete beams.
The invention provides a novel temporary prestress connecting device, which simplifies complicated procedures in the past construction process and reduces damage to a beam body structure in the concrete beam precast segment assembly construction process. The invention inserts the permanent prestressing tendons into the temporary prestressing holes after the temporary prestressing construction and seals the holes, thereby greatly improving the integrity and stability of the beam body.
Claims (5)
1. A temporary pre-stressing structure for a bridge segment beam, the bridge segment structure comprising a top plate, a bottom plate and a web plate, and a section (2) spliced between segments;
the method is characterized in that a groove (3) is arranged at the edge where the outer surface (1) of the top plate, the bottom plate and/or the web plate of the segment intersects with the section (2), and the groove (3) penetrates through the outer surface (1) and the section (2); one surface of the groove (3) is parallel to the section (2) and is used as a pressure-bearing surface (4) for tensioning temporary prestress;
corresponding grooves (3) are arranged at the sections (2) of the front side and the rear side of the segment; the two corresponding grooves (3) are communicated through a temporary pre-stress pore canal (6) which is arranged in the section and penetrates through the section, the temporary pre-stress pore canal (6) is perpendicular to the pressure bearing surface (4), and an opening is arranged on the pressure bearing surface (4) for a tensioning screw (7) to pass through;
the temporary pre-stressing tunnels (6) avoid permanent pre-stressing tunnels.
2. Temporary pre-stressing structure for bridge segment beams according to claim 1, characterized in that said pressure-bearing face (4) is further provided with steel pads (5) for distributing the local pressure; the steel backing plate (5) is correspondingly provided with an opening for the tension screw (7) to pass through at a position corresponding to the temporary pre-stress pore canal (6).
3. Temporary prestressing for bridge segment beams according to claim 1 or 2, characterized in that the outer surface (1) is the top or bottom surface of the top plate, the top or bottom surface of the bottom plate, and the sides of the web.
4. A temporary pre-stressing structure for a bridge segment girder according to claim 3, characterized in that one tensioning screw (7) is arranged in the temporary pre-stressing duct (6) of one segment, the tensioning screws (7) are provided with external threads, the tensioning screws (7) of two adjacent segments are connected through screw connectors (9), the screw connectors (9) are long tubular, and internal threads matched with the external threads of the tensioning screws (7) are arranged in the pipe wall; an anchor nut (8) is further arranged on the tensioning screw (7), and the anchor nut (8) is tightly clung to the steel backing plate (5) and is screwed down.
5. Temporary pre-stressing structure for bridge segment beams according to claim 4, characterized in that the temporary pre-stressing channels (6) have a diameter larger than the screw connector (9) and smaller than the outer diameter of the anchor nut (8), facilitating the extraction of the tensioning screw (7) when removed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910273512.8A CN109853398B (en) | 2019-04-05 | 2019-04-05 | Temporary pre-stressing structure for prefabricated segment assembly bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910273512.8A CN109853398B (en) | 2019-04-05 | 2019-04-05 | Temporary pre-stressing structure for prefabricated segment assembly bridge |
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| CN109853398A CN109853398A (en) | 2019-06-07 |
| CN109853398B true CN109853398B (en) | 2024-02-23 |
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| US5094044A (en) * | 1983-12-09 | 1992-03-10 | Dykmans Maximilliaan J | Multi-purpose dome structure and the construction thereof |
| JP2009133178A (en) * | 2007-11-01 | 2009-06-18 | Kyokuto Kogen Concrete Shinko Kk | Prestressed structure |
| CN103215894A (en) * | 2013-04-26 | 2013-07-24 | 中铁第一勘察设计院集团有限公司 | Mobile temporary prestress tension anchor block |
| CN105484142A (en) * | 2015-10-30 | 2016-04-13 | 河海大学 | Assembling type sectional precast concrete hollow plate girder structure and manufacturing method thereof |
| CN105735101A (en) * | 2016-05-11 | 2016-07-06 | 石家庄铁道大学 | High-speed railway rush repair beam capable of being converted into permanent bridge structure, and rush repair method of high-speed railway rush repair beam |
| CN108677729A (en) * | 2018-06-19 | 2018-10-19 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN208545670U (en) * | 2018-06-19 | 2019-02-26 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN210194433U (en) * | 2019-04-05 | 2020-03-27 | 上海公路桥梁（集团）有限公司 | Temporary prestress structure for prefabricated section assembled bridge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10913243B2 (en) * | 2016-01-19 | 2021-02-09 | Enclos Corporation | Pre-stressed plate or shell structures |
-
2019
- 2019-04-05 CN CN201910273512.8A patent/CN109853398B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094044A (en) * | 1983-12-09 | 1992-03-10 | Dykmans Maximilliaan J | Multi-purpose dome structure and the construction thereof |
| JP2009133178A (en) * | 2007-11-01 | 2009-06-18 | Kyokuto Kogen Concrete Shinko Kk | Prestressed structure |
| CN103215894A (en) * | 2013-04-26 | 2013-07-24 | 中铁第一勘察设计院集团有限公司 | Mobile temporary prestress tension anchor block |
| CN105484142A (en) * | 2015-10-30 | 2016-04-13 | 河海大学 | Assembling type sectional precast concrete hollow plate girder structure and manufacturing method thereof |
| CN105735101A (en) * | 2016-05-11 | 2016-07-06 | 石家庄铁道大学 | High-speed railway rush repair beam capable of being converted into permanent bridge structure, and rush repair method of high-speed railway rush repair beam |
| CN108677729A (en) * | 2018-06-19 | 2018-10-19 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN208545670U (en) * | 2018-06-19 | 2019-02-26 | 中国铁路总公司 | A kind of interim prestressing apparatus for precast segment spliced girder |
| CN210194433U (en) * | 2019-04-05 | 2020-03-27 | 上海公路桥梁（集团）有限公司 | Temporary prestress structure for prefabricated section assembled bridge |
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