CN103276674A - Method for reinforcing bridge by external transverse prestressing tendons - Google Patents
Method for reinforcing bridge by external transverse prestressing tendons Download PDFInfo
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- CN103276674A CN103276674A CN2013102389151A CN201310238915A CN103276674A CN 103276674 A CN103276674 A CN 103276674A CN 2013102389151 A CN2013102389151 A CN 2013102389151A CN 201310238915 A CN201310238915 A CN 201310238915A CN 103276674 A CN103276674 A CN 103276674A
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- transverse prestress
- stretch
- prestress muscle
- external transverse
- bridge
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Abstract
The invention belongs to a method for reinforcing a bridge by external transverse prestressing tendons. The method is characterized in that finish-rolled deformed steel bars are used as the transverse prestressing tendons, the tensioning ends and the fixing ends of the transverse prestressing tendons are cone anchors. The finish-rolled deformed steel bars are used as the transverse prestressing tendons, so that influences of vehicle load and bridge vibration on anchoring effect are reduced; the tensioning ends and the fixing ends are the cone anchors, so that loss of prestress is reduced effectively; loss of prestress of the finish-rolled deformed steel bars in an operation period is low; and meanwhile, the finish-rolled deformed steel bars can be tensioned quite conveniently, are simple in structure and high in practicality, and has high popularization and application value.
Description
Technical field
The invention belongs to the Technology Bridge Strengthening field, relate in particular to a kind of method of external transverse prestress muscle reinforcement bridge.
Background technology
Tradition adopts the method for external prestressing strengthening bridge, it is vertical generally to be applied to bridge, can be easy to improve the anti-bending bearing capacity of spaning middle section like this, improve structure stress, but for the assembling hollowcore slab, because its horizontal hollowcore slab is more, the general 8-12 sheet of arranging adopts and vertically applies external prestressing, though improved the stressed of each hollowcore slab, but applying of longitudinal prestressing, it is stressed to change bridge lateral, even aggravates the stressed possibility of horizontal veneer, and assembling hollowcore slab most important reason is the lateral ties weakness, must start with and improve its bearing capacity from improving lateral stiffness, add transverse prestress in the plate bottom application exactly and improve the lateral stiffness best bet, make hinge seam lower edge have certain compressive stress, thereby under the outer load effect, hinge is stitched not only Transfer of Shear, and transmits moment of flexure.
Summary of the invention
The invention provides a kind of method of external transverse prestress muscle reinforcement bridge, be intended to solve the method that tradition adopts the external prestressing strengthening bridge, it is vertical generally to be applied to bridge, can't change the stressed problem of bridge lateral.
The object of the present invention is to provide a kind of method of external transverse prestress muscle reinforcement bridge, this method adopts fining twisted steel as the transverse prestress muscle, and stretch-draw end and the fixed end of transverse prestress muscle all adopt conical surface ground tackle.
Further, described conical surface ground tackle adopts YGM type anchor, and YGM type anchor is made of anchor plate and nut.
Further, described YGM type anchor structure form has two kinds on taper seat and plane.
Further, stretch-draw end and fixed end all adopt conical surface ground tackle.
Further, the nut of fining twisted steel needs two times tensioning.
Further, transverse prestress muscle, tension tonnage are 17t.
Further, all adopt conical surface ground tackle at stretch-draw end and anchoring section.
Further, the loss of prestress of fining twisted steel is between 1%-4%;
Further, fining twisted steel can easily be mended stretch-draw.
Further, stretch-draw end and fixed end all adopt conical surface ground tackle.
The method of external transverse prestress muscle reinforcement bridge provided by the invention, this method adopt fining twisted steel as the transverse prestress muscle, and stretch-draw end and the fixed end of transverse prestress muscle all adopt conical surface ground tackle; The present invention adopts fining twisted steel as the transverse prestress muscle, vehicular load and bridge vibration have been reduced to the influence of anchoring effect, stretch-draw end and fixed end all adopt conical surface ground tackle, reduced loss of prestress effectively, fining twisted steel loss of prestress during runing is little, and fining twisted steel can easily be mended stretch-draw simultaneously, and is simple in structure, practical, have stronger popularization and using value.
Description of drawings
Fig. 1 is the transverse prestress arrangement diagram of external transverse prestress muscle reinforcement bridge provided by the invention;
Fig. 2 is the YGM type anchor structure schematic diagram of external transverse prestress muscle reinforcement bridge provided by the invention.
Among the figure: 1, anchor plate; 2, nut; 3, YGM type anchor.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further described in detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in and limit invention.
Below in conjunction with drawings and the specific embodiments application principle of the present invention is further described.The object of the present invention is to provide a kind of method of external transverse prestress muscle reinforcement bridge, Fig. 1 illustrates the transverse prestress arrangement diagram of a kind of external transverse prestress muscle reinforcement bridge provided by the invention; This method adopts fining twisted steel as the transverse prestress muscle, and stretch-draw end and the fixed end of transverse prestress muscle all adopt conical surface ground tackle.
Fig. 2 illustrates YGM type anchor 3 structural representations of a kind of external transverse prestress muscle reinforcement bridge provided by the invention.In embodiments of the present invention, conical surface ground tackle adopts YGM type anchor 3, and YGM type anchor 3 is made of anchor plate 1 and nut 2.
The present invention is by the transformation to fining twisted steel stretch-draw end anchor device, reduce the loss of prestress of fining twisted steel, adopt fining twisted steel as the presstressed reinforcing steel material, start with from the stretch-draw anchor end, reduce the loss of stretching force, can in bridge operation process, easily mend stretch-draw simultaneously.
Fining twisted steel is as prestressed material, be mainly used in the vertical prestressing of bridge construction, then use less, conventional prestressing force fining twisted steel employing YGM ground tackle at external prestressing and carry out anchoring, the YGM ground tackle is made up of anchor plate 1 and nut 2, and form of structure has two kinds on taper seat and plane.
Be used for the prestressing force fining twisted steel on the bridge construction, generally adopt the mode of single-ended stretch-draw to carry out.Adopt conical surface ground tackle in anchored end, adopt the plane ground tackle at the stretch-draw end, because conical surface ground tackle opposite planar type ground tackle contact area is big, and respective nut 2 is reserved with pintongs type notch, increased the frictional force between nut 2 and the backing plate, effectively reduced the loosening of nut 2, the type ground tackle generally is used for fixed end.And the plane ground tackle is plane contact between nut 2 and the anchor plate 1, and the frictional force of the two is corresponding less, and nut 2 is easier to become flexible, and generally is used for the anchoring of stretch-draw end, makes things convenient for the confinement of nut 2 in the stretching process.But because the nut 2 of plane contact is easily loosening, therefore generally need two times tensioning.
The present invention adopts the transverse prestress reinforcement bridge, tension tonnage is 17t, and the fining twisted steel tension tonnage that is used for vertical prestressing is 54t, is significantly less than the latter, under the effect of little tonnage stretching force, it is particularly important that the loss of prestress of fining twisted steel seems, if adopt traditional approach, the stretch-draw end adopts the plane ground tackle, and anchored end adopts conical surface ground tackle, action of long-term load lower nut 2 may become flexible, and is unfavorable to structure.
Therefore, utilize little tonnage stretch-draw characteristics, all adopt conical surface ground tackle at stretch-draw end and anchoring section, for the stretch-draw end, because tension tonnage is less, practice adopts conical surface ground tackle can't increase the difficulty of confining nut 2, improved the anchoring effect of fining twisted steel on the contrary, in stretching process, by the setting pressure ring fining twisted steel and prestress wire are compared monitoring, result such as following table:
Table with test results in the fining twisted steel stretching process
| ? | First strides | Second strides | The 4th strides | The design stretching force |
| Before the stretch-draw | 0 | 0 | 0 | ? |
| Stretch-draw 100% | 176.4 | 178.6 | 177.5 | 173 |
| After returning back to top | 173.5 | 170.1 | 176.9 | ? |
| Lose after the anchoring | -1.6％ | -4.8％ | -0.3％ | ? |
Table with test results in the prestress wire stretching process
| ? | The 5th strides | The 6th strides | The 7th strides | The design stretching force |
| Before the stretch-draw | 0 | 0 | 0 | ? |
| Stretch-draw 100% | 170 | 169.8 | 169.8 | 169.3 |
| After returning back to top | 161.3 | 158.9 | 158.8 | ? |
| Lose after the anchoring | -5.1％ | -6.4％ | -6.5％ | ? |
Can find out that from last table in the steel strand tension process, loss of prestress is generally about 5%, and the loss of prestress of fining twisted steel does not wait at 1%-4%.The loss of prestress of fining twisted steel in stretching process is less than steel strand.This mainly is that its amount of recovery of regulation and stipulation is generally 6mm because steel strand tension leans on the anchoring of intermediate plate retraction fully.Be to leave certain space between intermediate plate and the anchor plate 1, during stretch-draw, presstressed reinforcing steel can freely extend like this, and intermediate plate can not cause damage to the power muscle.Therefore steel strand tension is fairly simple, reaches tension tonnage, holds lotus direct oil return release in 5 minutes, the automatic anchoring of intermediate plate.And after fining twisted steel is stretched to builder's tonnage, could the oil return release after must urgent nut 2.At this moment, nut 2 degree direct influence of tightening the effective prestress after the anchoring.This bridge transverse prestress tension tonnage is little, so nut 2 is easy to tighten, and the compressive force after nut 2 is tightened even might surpass stretch-draw prestressing force, and therefore, its loss of prestress that causes is less.
By effective prestress in the operation process being observed test result such as following table:
| The position | 2010-11 | 2011-6 | 2012-6 | The internal force loss |
| Right 67 | 195.9 | 187 | 181 | 7.61％ |
| Right 80 | 196.3 | 186 | 183 | 6.78％ |
| Right 93 | 188 | 179 | 174 | 7.45％ |
| A left side 91 | 173 | 166 | 160 | 7.51％ |
| A left side 107 | 187.2 | 177 | 172 | 8.12％ |
| Right 107 | 176.7 | 167.8 | 171 | 3.23％ |
As can be seen from the above table, fining twisted steel is lost in 3%～8% in operation in phase phase, and under the action of long-term load, loss of prestress is less, can satisfy instructions for use.
The present invention adopts fining twisted steel as the transverse prestress muscle, reduces vehicular load and bridge vibration to the influence of anchoring effect; Stretch-draw end and fixed end all adopt conical surface ground tackle, effectively reduce loss of prestress; The loss of fining twisted steel in the tension of prestressed tendon process is less than steel strand; Fining twisted steel loss of prestress during runing is little; Fining twisted steel can easily be mended stretch-draw.
The method of the external transverse prestress muscle reinforcement bridge that the embodiment of the invention provides, this method adopt fining twisted steel as the transverse prestress muscle, and stretch-draw end and the fixed end of transverse prestress muscle all adopt conical surface ground tackle; The present invention adopts fining twisted steel as the transverse prestress muscle, vehicular load and bridge vibration have been reduced to the influence of anchoring effect, stretch-draw end and fixed end all adopt conical surface ground tackle, reduced loss of prestress effectively, fining twisted steel loss of prestress during runing is little, and fining twisted steel can easily be mended stretch-draw simultaneously, and is simple in structure, practical, have stronger popularization and using value.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for an external transverse prestress muscle reinforcement bridge is characterized in that, this method adopts fining twisted steel as the transverse prestress muscle, and stretch-draw end and the fixed end of transverse prestress muscle all adopt conical surface ground tackle.
2. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, described conical surface ground tackle adopts YGM type anchor, and YGM type anchor is made of anchor plate and nut.
3. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, described YGM type anchor structure form has two kinds on taper seat and plane.
4. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, stretch-draw end and fixed end all adopt conical surface ground tackle.
5. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, the nut of fining twisted steel needs two times tensioning.
6. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, transverse prestress muscle, tension tonnage are 17t.
7. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, all adopts conical surface ground tackle at stretch-draw end and anchoring section.
8. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, the loss of prestress of fining twisted steel is between 1%-4%.
9. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, fining twisted steel can easily be mended stretch-draw.
10. the method for external transverse prestress muscle reinforcement bridge as claimed in claim 1 is characterized in that, stretch-draw end and fixed end all adopt conical surface ground tackle.
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| CN2013102389151A CN103276674A (en) | 2013-06-17 | 2013-06-17 | Method for reinforcing bridge by external transverse prestressing tendons |
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| CN2013102389151A CN103276674A (en) | 2013-06-17 | 2013-06-17 | Method for reinforcing bridge by external transverse prestressing tendons |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105200929A (en) * | 2015-09-10 | 2015-12-30 | 临沂市公路勘察设计院 | Reinforcement method of hoop prestressed tendons for beam bridge based on single beam bearing |
| CN105297640A (en) * | 2015-10-22 | 2016-02-03 | 王壹帆 | Method for applying external prestress to assembled slab bridge |
| CN105421813A (en) * | 2015-12-07 | 2016-03-23 | 中国建筑第八工程局有限公司 | External prestressing reinforcing method for concrete truss |
| CN105735153A (en) * | 2016-04-12 | 2016-07-06 | 沈阳建筑大学 | Reinforcement structure for inclined cracks in main girder web plate of box girder bridge and construction method thereof |
| CN109577560A (en) * | 2018-11-07 | 2019-04-05 | 同济大学 | A kind of fixing end p-type anchorage |
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| CN2511711Y (en) * | 2001-12-07 | 2002-09-18 | 沈阳铁路局科学技术研究所 | Prestressed lateral strengthened concrete beam |
| CN2658264Y (en) * | 2003-10-31 | 2004-11-24 | 柳州欧维姆机械股份有限公司 | Vertical prestress anchornig device |
| CN101949135A (en) * | 2010-10-12 | 2011-01-19 | 郑州大学 | Transverse anchorage system outside hollow slab bridge body and construction process thereof |
| KR20120016863A (en) * | 2010-08-17 | 2012-02-27 | 한국건설기술연구원 | Bridge construction method to adjust curvature for psc t-girder |
| CN202881855U (en) * | 2012-10-15 | 2013-04-17 | 浙江省交通工程建设集团有限公司第二分公司 | Cast-in-place box beam vertical prestress stainless steel tension connection device |
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2013
- 2013-06-17 CN CN2013102389151A patent/CN103276674A/en active Pending
Patent Citations (5)
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| CN2511711Y (en) * | 2001-12-07 | 2002-09-18 | 沈阳铁路局科学技术研究所 | Prestressed lateral strengthened concrete beam |
| CN2658264Y (en) * | 2003-10-31 | 2004-11-24 | 柳州欧维姆机械股份有限公司 | Vertical prestress anchornig device |
| KR20120016863A (en) * | 2010-08-17 | 2012-02-27 | 한국건설기술연구원 | Bridge construction method to adjust curvature for psc t-girder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105200929A (en) * | 2015-09-10 | 2015-12-30 | 临沂市公路勘察设计院 | Reinforcement method of hoop prestressed tendons for beam bridge based on single beam bearing |
| CN105200929B (en) * | 2015-09-10 | 2016-08-31 | 临沂市公路勘察设计院 | The reinforcement means of single slab bearing beam bridge hoop presstressed reinforcing steel |
| CN105297640A (en) * | 2015-10-22 | 2016-02-03 | 王壹帆 | Method for applying external prestress to assembled slab bridge |
| CN105297640B (en) * | 2015-10-22 | 2016-09-14 | 王壹帆 | A kind of assembled slab bridge external prestressing applying method |
| CN105421813A (en) * | 2015-12-07 | 2016-03-23 | 中国建筑第八工程局有限公司 | External prestressing reinforcing method for concrete truss |
| CN105735153A (en) * | 2016-04-12 | 2016-07-06 | 沈阳建筑大学 | Reinforcement structure for inclined cracks in main girder web plate of box girder bridge and construction method thereof |
| CN109577560A (en) * | 2018-11-07 | 2019-04-05 | 同济大学 | A kind of fixing end p-type anchorage |
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Application publication date: 20130904 |