CN109853398A - A kind of interim prestressed structure for Precast Concrete Segmental Bridges formula bridge - Google Patents
A kind of interim prestressed structure for Precast Concrete Segmental Bridges formula bridge Download PDFInfo
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- CN109853398A CN109853398A CN201910273512.8A CN201910273512A CN109853398A CN 109853398 A CN109853398 A CN 109853398A CN 201910273512 A CN201910273512 A CN 201910273512A CN 109853398 A CN109853398 A CN 109853398A
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- screw rod
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- groove
- tensioning
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- 239000011178 precast concrete Substances 0.000 title abstract description 7
- 239000011148 porous material Substances 0.000 claims abstract description 29
- 230000002146 bilateral effect Effects 0.000 claims abstract description 3
- 239000006185 dispersion Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 23
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 238000009499 grossing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012407 engineering method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to technical field of bridge construction, specially a kind of interim prestressed structure for Precast Concrete Segmental Bridges formula bridge.It is equipped with groove with the edge that section is intersected in the top plate and bottom plate of existing bridge subsection and/or the outer surface of web, groove penetrates through outer surface and section；And there is a tensioning temporarily prestressed pressure-bearing surface in groove；It is connected between the corresponding groove of the forward and backward bilateral of segment by interim prestressed pore passage, is passed through for tensioning screw rod.It is an advantage of the current invention that interim prestressed pore passage and groove are reserved in segment, eliminate to install interim prestressing force steel-tooth bank and longitudinally open location hole in beam body, avoids damage girder construction risk；Reinforcing bar is put into when finally pouring reserved conduit simultaneously and connects adjacent beam sections, ensure that the globality of the whole beam that collapses.And it saves traditional installation and removes steel-tooth bank and fill the step of smoothing out location hole one by one, the construction time is greatly saved.
Description
Technical field
The invention belongs to technical field of bridge construction, and in particular to a kind of for the interim pre- of Precast Concrete Segmental Bridges formula bridge
Stress structure.
Background technique
Bridge superstructure is exactly divided into several standard beam sections by precast segment assembling construction engineering method, principle,
It is standby on bridge substructure with the installing of the special spliceds such as Bridge Erector at the scene after the completion of prefabricated place matching is prefabricated, in order
Block-by-block spelling, while applying prestressing force, overall structure is made, and promoted by cross along scheduled installation direction, by cross
It is assembled.
It is suitable for Medium Spans (30~50m), bridge total length longer marine, Large River lake, Bridges in Mountainous Areas
And the superstructures such as overhead road of city and light rail box beam or beam channel are constructed；And the duration it is tight engineering use it is the most suitable.
And during whole across section assembling, before the permanent pre-stress construction of structure, to connect adjacent segment closely
And need to apply an interim prestressing force.Interim prestressing force closely connects between can guarantee adjacent segment in assembly, prevents segment
Dislocation, and make edge joint position there are compression, so that the binder for smearing edge joint position is reliably effective.Permanent when bridge pre- is answered
When being in bridge completion state after power applies completion, between segment, interim prestressing force can be removed.
The interim method for applying prestressing force routinely used now, is that one group of steel-tooth is fixed temporarily in each beam sections
Bank.These steel-tooth banks are to be fastened and connected using high-strength bolt with the hole reserved on bridge top plate or bottom plate.Then adjacent
One group of corresponding steel-tooth bank in two beam sections is connected by long bolt, both ends tensioning fastening, thus to completing to spell
The segment connect applies interim compression, and two beam sections are close to together, apply permanent prestressing force for after and prepare.
Tensioning screw rod is removed later, removes steel-tooth bank.This method needs additional steel-tooth bank to assist, and will be in segment
Through hole is reserved on the permanent structure of beam, both will affect the top of bridge, the local strength of floor structure, it also can be to bridge
Durability causes a hidden trouble.
Main bridge structure section includes the bridge of box section, and vehicular load is located at the top surface of box-structure；Slot
Shape section (is also known as U-shaped section) in recent years, and vehicular load is located on bottom plate.
Summary of the invention
At low cost the purpose of the present invention is to provide a kind of structure is simple, construction is easily used for Precast Concrete Segmental Bridges formula
The interim prestressed structure of bridge.
Interim prestressed structure provided by the present invention for Precast Concrete Segmental Bridges formula bridge is based on existing bridge
Bay structural.Existing bridge subsection structure includes the section spliced between top plate and bottom plate and web and segment and segment
2；Wherein:
It is equipped with groove 3 with the edge that section 2 is intersected in the top plate and bottom plate of segment and/or the outer surface 1 of web, which passes through
Lead to the outer surface 1 and section 2；And have that a face is parallel with section 2 in groove 3, as the interim prestressed pressure-bearing surface 4 of tensioning；
Corresponding groove 3 is equipped at the section 2 of the forward and backward bilateral of segment；Pass through setting between two corresponding grooves 3
Interim prestressed pore passage 6 in segment and through segment is connected to, and the interim prestressed pore passage 6 is perpendicular to pressure-bearing surface 4, and aperture
On pressure-bearing surface 4, passed through for tensioning screw rod 7；
The interim prestressed pore passage 6 avoids permanent prestressed pore passage.
In the present invention, the billet 5 of dispersion local pressure is additionally provided on the pressure-bearing surface 4；It is corresponding interim on billet 5
The position of prestressed pore passage 6 is provided with the aperture passed through for tensioning screw rod 7 accordingly.
In the present invention, the groove 3 can be set multiple according to the every side of construction needs.
In the present invention, the outer surface 1 is the top surface or bottom surface of top plate, the top surface or bottom surface of bottom plate and the side of web
Face.
In the present invention, a tensioning screw rod 7 is set, and tensioning screw rod 7 is with outer in the interim prestressed pore passage 6 of a segment
The tensioning screw rod 7 of screw thread, two neighboring segment is connected by screw rod connector 9, and screw rod connector 9 is elongated tubular, is set in tube wall
There is the matched internal screw thread of same 7 external screw thread of tensioning screw rod；Bolt-nut 8 is additionally provided on tensioning screw rod 7, bolt-nut 8 is close to steel pad
On plate 5 and tighten.
In the present invention, interim 6 diameter of prestressed pore passage is greater than 9 diameter of screw rod connector, is less than outside bolt-nut 8
Diameter is extracted out convenient for tensioning screw rod 7 when dismounting.
The present invention in use, by several segments successively spicing forming type in order, pass through prestress hole using tensioning screw rod 7
Road is inserted into a tensioning screw rod 7 in the interim prestressed pore passage of each segment, in the groove of two neighboring segment docking, makes
It is linked together with the last period screw rod with screw rod connector；Tensioning screw rod 7 in each beam sections groove, after being installed
It by jack tension to set pulling force, then, is tightened with bolt-nut 8,8 medial surface of bolt-nut is close on pressure-bearing surface
Billet, billet are further that bolt-nut 8 provides support force；The bolt-nut 8 on spliced segment one side is constantly tightened,
Interim prestressing force is provided between segment and segment, makes to reach between it required compression.
After concatenation construction is completed in all segments finally wait spell bridge beam, permanent prestressed stretch-draw is carried out.It is permanent pre-
After the completion of stress tension, twists and send and unload screw rod connector, remove bolt-nut 8 in a groove, tensioning screw rod 7 is extracted out.
After the completion of permanent tensioning construction, filled in interim prestressed pore passage with cement mortar, relative to vertical
It is easy for construction for perforation, and the hidden danger that filler is fallen is not had；
Alternatively, the interim prestressed pore passage can be retained in structure and be not filled with, convenient for the prestressed dimension of reinforcement again in later period
Shield.After the bridge operation several years, due to factors such as vibration, agings, permanent prestressing force needs reinforcement；It can utilize again in this way
Groove is inserted into tensioning screw rod, carries out reinforcement prestressing force；Due to greatly facilitating later period bridge it is not necessary that steel-tooth bank is in addition arranged again
Maintenance.
It is an advantage of the current invention that segment top plate and bottom plate and/or web etc. reserve interim prestressed pore passage and groove,
It eliminates to install interim prestressing force steel-tooth bank and longitudinally opens location hole in beam body, avoid damage girder construction risk；Moreover,
Without longitudinal hole, also just without filling longitudinal hole, there will be no longitudinal fillers due to falling after of long duration under the effect of gravity
The risk fallen；Reinforcing bar is put into when finally pouring reserved conduit simultaneously and connects adjacent beam sections, ensure that the globality of the whole beam that collapses.
And it saves traditional installation and removes steel-tooth bank and fill the step of smoothing out location hole one by one, when construction is greatly saved
Between.
Detailed description of the invention
Fig. 1 is the structure diagram of single segment in embodiment 1.
Fig. 2 is the enlarged structure schematic diagram of a-quadrant in Fig. 1.
Fig. 3 is billet structure diagram in embodiment 1.
Fig. 4 is the plan structure schematic diagram of three sections of segments splicing in embodiment 1.
Fig. 5 is the enlarged structure schematic diagram of B area in Fig. 4.
Figure label: 1 is outer surface, and 2 be section, and 3 be groove, and 4 be pressure-bearing surface, and 5 be billet, and 6 be interim prestressing force
Duct, 7 be tensioning screw rod, and 8 be bolt-nut, and 9 be screw rod connector.
Specific embodiment
Embodiment 1
The U-shaped beam sections of two webs are selected, segment is the molding of concrete formed by integrally casting, which is divided into bottom
Plate and flange plate (web) two parts, beam length 29.4m, deck-molding 2.2m, top width 9.928m, bottom width 7.706m；There are two flange plates,
The both ends of bottom plate are respectively arranged at, bearing is supported using crossbeam two point.Every bridge is made of 10 beam sections, every agreement that contracts a film or TV play to an actor or actress 40t.
Plate upper surface plane and web top end part plane as outer surface 1, slot with 2 intersection location of section, shape
At the cube groove 3 of perforation outer surface 1 and section 2；The groove 3 is a cuboid (no top end face and front end face).
Only one facade (i.e. the rear end face of cuboid) is parallel with section 2 in the groove 3, as pressure-bearing surface 4；Pressure-bearing
Face 4 is equipped with a concave station；Billet 5 is preset on pressure-bearing surface 4, the one side that billet 5 is fitted in pressure-bearing surface 4 is equipped with and concave station
The boss to match, the boss are integrally formed with billet 5, in concave station, are set on pressure-bearing surface 4 with this billet 5
When, by the fixed position of concave station, will not be misplaced due to external force.Pressure-bearing surface 4 is equipped with the aperture passed through for tensioning screw rod 7, this is opened
Bore dia is less than the diameter of interim prestressed pore passage 6.
It is integrally formed and is set on pressure-bearing surface 4 when the billet 5 is poured by segment.
Interim prestressed pore passage 6 is also in being preset in segment, integrated molding when pouring；Interim prestressed pore passage 6 perpendicular to
Section 2 passes through that is, perpendicular to pressure-bearing surface 4 for tensioning screw rod 7 and reinforcing bar；The aperture of interim prestressed pore passage 6 is located at pressure-bearing surface 4
On；Interim prestressed pore passage 6 avoids permanent prestressed pore passage.Interim 6 diameter of prestressed pore passage is greater than 9 diameter of screw rod connector,
Less than 8 outer diameter of bolt-nut, when dismounting, extracts out convenient for tensioning screw rod 7.
A groove 3 is respectively set on one side on two webs, respectively sets two grooves 3 on one side on bottom plate.
When construction, segment and segment are successively spliced, and after two segment splicings, a tensioning is respectively inserted into each segment
Screw rod 7；In 3 position of groove, each bolt-nut 8 is screwed into from phase the same end of every tensioning screw rod 7, clings to billet 5；
Meanwhile two tensioning screw rods 7 are connected in the groove 3 of docking by screw rod connector 9；Screw rod connector 9 is elongated tubular,
Centre is equipped with through-hole, is equipped in through-hole with the matched internal screw thread of 7 external screw thread of tensioning screw rod；Two tensioning screw rods 7 are screwed into spiral shell respectively
9 both ends of rod connector, reach the state of being fixedly connected.
Specifically:
It is tightened in 3 position of (starting section) groove in first section 2 with bolt-nut 8 first segment；
It is tightened in 3 position of (rear section) groove in second section 2 with bolt-nut 8 first segment；
First, the tensioning screw rod 7 on second segment connection tightened by screw rod connector 9；Then, on second segment
3 position of (rear section) groove in second section 2 passes through setting jack tension to set default value of thrust；It again will be at this
Bolt-nut 8 is tightened, and interim prestressing force is provided between segment and segment；
Thus first, second two panels segment splicing are completed.
Similarly, third segment and second segment are spliced, and (the rear section) on third segment in second section 2 is recessed
3 position of slot is tightened by setting jack tension to set pulling force, then by bolt-nut 8 at this, between segment and segment
Interim prestressing force is provided, second, the splicing of third two panels segment are thus completed.
Each segment connection and so below, tensioning screw rod 7 successively in splicing, is docked, lead in the same way
It crosses setting jack tension and carries out tightening fixation to set pulling force, then bolt-nut 8.
After last whole bridge subsection girder completes the construction such as splicing, permanent tensioning spiral shell is set in permanent prestressed pore passage
Bar 7 after carrying out permanent prestressing force fastening, removes bolt-nut 8 in groove 3, removes screw rod connector 9, tensioning screw rod 7 is taken out
Out.Then it is put into connection reinforcing bar in interim prestressed pore passage, pours reserved groove and fills and leads up, bridge pavement construction can be carried out.
Embodiment 2
Box beam sections, integrated pouring molding are selected, every bridge is made of 10 beam sections, every agreement that contracts a film or TV play to an actor or actress 40t.
It slots in bottom plate outer surface of upper 1 with 2 intersection location of section, and intersects in top plate outer surface of upper 1 with section 2
Position fluting, forms the cube groove 3 of perforation outer surface 1 and section 2；Remaining structure and form of construction work are the same as embodiment 1.
After the construction such as splicing is completed in the last whole each segment of bridge, after carrying out permanent prestressing force fastening, bridge subsection
Beam group length is longer, segmentation can remove screw rod connector 9 from intermediate groove 3, then using long bolt can Deformation Features,
Directly extract respective tension screw rod out from groove 3.Then connection reinforcing bar is put into interim prestressed pore passage, pour reserve it is recessed
Slot is filled and led up, and bridge pavement construction can be carried out.
The present invention is when carrying out stretching construction, it is contemplated that the possibility of bolt-nut stress failure, it can will be on prefabricated subsection
Whole stretching construction is all unscrewed and then carried out to multiple bolt-nuts far from tensioning side.After the completion of construction to be tensioned,
These bolt-nuts are tightened again.Then the bolt-nut on each prefabricated subsection close to tensioning side is checked.If it is necessary, to this
A little bolt-nuts are tightened operation again.
Moreover, permanent prestressing force may weaken in bridge validity period, permanently answered in advance to require supplementation with tensioning
Power；In this way, newly-increased permanent prestressed application directly can be carried out using original groove 3, answering for structure is readjusted with this
Power is horizontal, without punching installation steel-tooth bank again, improves the convenience of bridge inspection and maintenance reinforcement.
Present invention is equally applicable to other kinds of beams of concretes.
The present invention provides a kind of new interim prestressing force attachment devices, in beams of concrete Precast Concrete Segmental Bridges work progress
In, the cumbersome process in previous work progress is simplified, the destruction to girder construction is reduced.The present invention is applied in interim prestressing force
Permanent presstressed reinforcing steel has been placed in after work in interim prestress hole, and has been closed, the integrality of beam body and steady is substantially increased
It is qualitative.
Claims (5)
1. a kind of interim prestressed structure for bridge subsection girder, bridge subsection structure includes top plate and bottom plate and web, with
And the section (2) spliced between segment and segment；
It is characterized in that, being equipped in the edge of outer surface (1) same to section (2) intersection of the top plate and bottom plate and/or web of segment
Groove (3), the groove (3) penetrate through the outer surface (1) and section (2)；And have the same section in a face (2) in groove (3) in parallel, make
For the interim prestressed pressure-bearing surface (4) of tensioning；
Corresponding groove (3) is equipped at the section (2) of the forward and backward bilateral of segment；Lead between two corresponding grooves (3)
It crosses and is set in segment and is connected to through the interim prestressed pore passage (6) of segment, the interim prestressed pore passage (6) is perpendicular to pressure-bearing
Face (4), and aperture is located on pressure-bearing surface (4), passes through for tensioning screw rod (7)；
The interim prestressed pore passage (6) avoids permanent prestressed pore passage.
2. being used for the interim prestressed structure of bridge subsection girder as described in claim 1, which is characterized in that the pressure-bearing surface
(4) billet (5) of dispersion local pressure is additionally provided on；The position of interim prestressed pore passage (6) is corresponded on billet (5),
It is provided with the aperture passed through for tensioning screw rod (7) accordingly.
3. being used for the interim prestressed structure of bridge subsection girder as claimed in claim 1 or 2, which is characterized in that the appearance
Face (1) is the top surface or bottom surface of top plate, the top surface or bottom surface of bottom plate and the side of web.
4. being used for the interim prestressed structure of bridge subsection girder as claimed in claim 3, which is characterized in that segment is faced
When prestressed pore passage (6) in a tensioning screw rod (7) is set, tensioning screw rod (7) has external screw thread, the tensioning of two neighboring segment
Screw rod (7) is connected by screw rod connector (9), and screw rod connector (9) is elongated tubular, is equipped with same tensioning screw rod (7) outside in tube wall
The matched internal screw thread of screw thread；It is additionally provided on tensioning screw rod (7) bolt-nut (8), bolt-nut (8) is close on billet (5) simultaneously
It tightens.
5. being used for the interim prestressed structure of bridge subsection girder as claimed in claim 4, which is characterized in that described temporarily to answer in advance
Power duct (6) diameter is greater than screw rod connector (9) diameter, is less than bolt-nut (8) outer diameter, is convenient for tensioning screw rod (7) when dismounting
Extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910273512.8A CN109853398B (en) | 2019-04-05 | 2019-04-05 | Temporary pre-stressing structure for prefabricated segment assembly bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910273512.8A CN109853398B (en) | 2019-04-05 | 2019-04-05 | Temporary pre-stressing structure for prefabricated segment assembly bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109853398A true CN109853398A (en) | 2019-06-07 |
| CN109853398B CN109853398B (en) | 2024-02-23 |
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| 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 |
| US20170203547A1 (en) * | 2016-01-19 | 2017-07-20 | Enclos Corporation | Pre-stressed plate or shell structures |
| 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 |
-
2019
- 2019-04-05 CN CN201910273512.8A patent/CN109853398B/en active Active
Patent Citations (9)
| 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 |
| US20170203547A1 (en) * | 2016-01-19 | 2017-07-20 | Enclos Corporation | Pre-stressed plate or shell structures |
| 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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| CN109853398B (en) | 2024-02-23 |
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