CN108086172A - A kind of method that spandrel arch bridge is reinforced using adjustment dead load thrust line - Google Patents
A kind of method that spandrel arch bridge is reinforced using adjustment dead load thrust line Download PDFInfo
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- CN108086172A CN108086172A CN201711373586.6A CN201711373586A CN108086172A CN 108086172 A CN108086172 A CN 108086172A CN 201711373586 A CN201711373586 A CN 201711373586A CN 108086172 A CN108086172 A CN 108086172A
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- arch
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- thrust line
- load thrust
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D4/00—Arch-type bridges
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of method for reinforcing spandrel arch bridge using adjustment dead load thrust line, according to the actual arch of arch bridge（1）With dead load thrust line（2）Deviation, using increasing weight concrete on arch ring（3）Method make dead load thrust line（2）As far as possible close to the actual arch of arch bridge main arch ring（1）, improve arch bridge stress.This method consolidation effect is notable, reinforcing expense is low, construction is simple；Durability, economic rationality and the working security of structure can be improved, a kind of reinforcement means efficiently, practical is provided for spandrel arch bridge.
Description
Technical field
The invention belongs to old bridge reinforcement technical field, and in particular to a kind of to reinforce open web type using adjustment dead load thrust line
The method of arch bridge.
Background technology
Arch bridge is a kind of bridge type of most China's national characters, and before reform and opening-up, the highway bridge in China about 70% is arch
Bridge；So far mostly runed 30~40 years, with scientific and technological progress, the promotion of social industrialized level, the increasing of vehicle capacity
Greatly, speed is continuously improved, and people also proposed higher requirement to the service level of road, still, the bridge that early stage builds, by
Low in construction criteria, bearing capacity and traffic capacity deficiency have been unable to meet fast-developing daily need；Therefore in number with ten thousand
In the old bridge of meter, there is substantial amounts of arch bridge to need reinforcement, otherwise will seriously affect the normal operation of traffic, economic development is formed
The restriction of " bottleneck " formula, wherein long-span arch bridge are mostly spandrel arch bridge.
Dilapidated bridge is reinforced, maintenance task is very heavy, in order to ensure smooth traffic, to these old bridges as being added by repair
Though it is allowed to maintain the method for an economical rationality of can yet be regarded as that is normally open to traffic, it is newly-built all to take down the old bridge, neither science,
It is unrealistic.It was verified that using appropriate reinforcement technique, to recovering and improving the bearing capacity of old bridge and using ability, extend
The service life of bridge is practicable to meet the needs of modern transportation transport.The effect of old bridge reinforcement not only embodies
Raising of improvement, bearing capacity in bridge structure function etc., moreover it is possible to save great amount of investment, generate huge society, warp
Ji benefit.
The common reinforcement means of arch bridge mainly includes at present：Enlargement of Section, bonding steel plate method, affixing carbon fabric method,
Increase auxiliary part method for strengthening, external prestressed strengthening method etc..More than reinforcement means is for actual arch and dead load thrust line
The little arch bridge of deviation can effectively improve the stress of arch bridge.But excessive arch bridge, actual arch axis are deformed for main arch ring
The deviation of line and dead load thrust line is larger, at this time if using conventional reinforcement means, cannot effectively improve master
The force-bearing situation of arch ring, consolidation effect is bad, some do not have consolidation effect even.For this kind of arch bridge, using concrete matched
Weight method is very necessary.
The content of the invention
It is an object of the invention to be directed to intrinsic dead load thrust line and actual arch to have certain deviation or process
Reinforcing is not achieved using conventional reinforcement means in the spandrel arch bridge that dead load thrust line deviates with actual arch after runing for many years
Under effect, a kind of method that spandrel arch bridge is reinforced using concrete weight coating method is provided.This method is not influencing full-bridge safety
In the case of, apply concrete weight coating in hogback, dead load thrust line is made to be overlapped as far as possible with actual arch, can significantly be improved
Main arch ring internal force improves consolidation effect, improves durability, economic rationality and the working security of structure, is pressure line and arch
There are the arch bridges of deviation to provide a kind of reinforcement means efficiently, practical, with good economic efficiency and social benefit for axis.
To achieve these goals, present invention employs following technical schemes：
A kind of method for reinforcing spandrel arch bridge using adjustment dead load thrust line, comprises the following steps successively：
A. the actual arch of arch bridge by the way of field survey, is determined according to the both stateful of spandrel arch bridge first；
B. according to the actual dead load of arch bridge, its dead load thrust line is determined, the equation of dead load thrust line is：
Wherein, m is arch axis coefficient, gjIntensity, g are distributed for vault dead loaddIntensity is distributed for arch springing dead load, f is rise, chk
ξ is hyperbolic cosine；
C. the deviation of actual arch and dead load thrust line is compared, adjusts dead load thrust line, dead load thrust line is made to try one's best and reality
Arch overlaps；Specifically method of adjustment is：
The curve location relation of dead load thrust line and actual arch is first determined whether, it is then determined that applying the position of weight concrete
With with weight, i.e.,：
（1）If dead load thrust line in the top of actual arch, should increase the arch axis coefficient m of dead load thrust line, make dead load pressure
The y values of the line of force reduce；According to formulaIt understands, should increased amount be needed according to arch axis coefficient m, really
Moment of flexure at fixed 1/4 span of archMoment of flexure at incrementss and arch springingReduction amount, so that it is determined that needing what is applied to match somebody with somebody on hogback
The position of loaded concrete and with weight；
（2）If dead load thrust line in the lower section of actual arch, should reduce the arch axis coefficient m of dead load thrust line, make dead load pressure
The y values of the line of force increase；According to formulaIt understands, the amount reduced should be needed according to arch axis coefficient m, really
Moment of flexure at fixed 1/4 span of archMoment of flexure at reduction amount and arch springingIncrementss, so that it is determined that needing what is applied to match somebody with somebody on hogback
The position of loaded concrete and with weight.
The present invention further illustrates that, when the main arch ring cross-section of arch bridge need not increase, used weight concrete is only
Make structure driven bearing by counterweight effect to adjust arch ring internal force；When arch bridge main arch ring cross-section needs to increase, it usually needs increase
The position in section is identical with the position of weight concrete, by the way of the bar planting casting concrete on main arch ring, mixes counterweight
Solidifying soil forms whole, common stress with main arch ring, while plays the role of increasing section and adjustment arch ring internal force.
Present invention further explanation, the intensity of used weight concrete and the concrete strength phase of the main arch ring of arch bridge
It is same or slightly higher.
The present invention further illustrates that this method, which is suitable for intrinsic dead load thrust line and the arch of main arch ring, to be had centainly
Deviation or the spandrel arch bridge that the actual arch of dead load thrust line and main arch ring deviates after runing for many years.
Advantages of the present invention：
1. making it as far as possible close with the actual arch of main arch ring by adjusting dead load thrust line, it can effectively reduce main arch ring
Moment of flexure gives full play to the good compressive property of arch bridge.Ancillary method as other reinforcement means in this way can make master
Arch ring stress is more reasonable.
2. deforming excessive arch bridge for main arch ring, the deviation of actual arch and dead load thrust line is larger, is added using this
The consolidation effect of solid method is more prominent.
Description of the drawings
Fig. 1 is the mechanics line schematic diagram of one embodiment of the invention.
Reference numeral：The actual archs of 1-, 2- dead load thrust lines, 3- weight concretes.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
A kind of method for reinforcing spandrel arch bridge using adjustment dead load thrust line, comprises the following steps successively：
A. the actual arch 1 of arch bridge by the way of field survey, is determined according to the both stateful of spandrel arch bridge first；
B. according to the actual dead load of arch bridge, its dead load thrust line 2 is determined, the equation of dead load thrust line is：
Wherein, m is arch axis coefficient, gjIntensity, g are distributed for vault dead loaddIntensity is distributed for arch springing dead load, f is rise；
C. the deviation of actual arch and dead load thrust line is compared, adjusts dead load thrust line, dead load thrust line is made to try one's best and reality
Arch overlaps；Specifically method of adjustment is：
The curve location relation of dead load thrust line 2 and actual arch 1 is first determined whether, it is then determined that applying weight concrete 3
Position and with weight, i.e.,：
（1）If dead load thrust line in the top of actual arch, should increase the arch axis coefficient m of dead load thrust line, make dead load pressure
The y values of the line of force reduce；According to formulaIt understands, should increased amount be needed according to arch axis coefficient m, really
Moment of flexure at fixed 1/4 span of archMoment of flexure at incrementss and arch springingReduction amount, so that it is determined that needing what is applied to match somebody with somebody on hogback
The position of loaded concrete and with weight；
（2）If pressure line in the lower section of arch, should reduce the arch axis coefficient m of dead load thrust line, make the y values of dead load thrust line
Increase；According to formulaIt understands, the amount reduced should be needed according to arch axis coefficient m, determine 1/4 span of arch
The moment of flexure at placeMoment of flexure at reduction amount and arch springingIncrementss, so that it is determined that needing the weight concrete applied on hogback
Position and with weight.
When the main arch ring cross-section of arch bridge need not increase, used weight concrete only makes structure driven bearing by counterweight
It acts on adjusting arch ring internal force；When arch bridge main arch ring cross-section needs to increase, it usually needs the position and counterweight for increasing section are mixed
It is identical to coagulate the position of soil, by the way of the bar planting casting concrete on main arch ring, weight concrete is made to be formed with main arch ring whole
Body, common stress, while play the role of increasing section and adjustment arch ring internal force.The intensity and arch of used weight concrete
The concrete strength of the main arch ring of bridge is identical or slightly higher.
Example：
Certain spanning degree is the open web type box plate arch of 140m, and the dead load hogging moment of left semiarch arch springing is more much larger than right semiarch arch springing,
Left semiarch arch springing stress is caused to be unsatisfactory for code requirement, it is necessary to reinforce.
First according to the both stateful of this bridge, by the way of multiple field survey, the actual arch 1 of bridge is determined；
Then according to the actual dead load of arch bridge, its dead load thrust line 2 is determined, the equation of load pressure line is：Wherein, m is arch axis coefficient, gjIntensity, g are distributed for vault dead loaddIt is distributed for arch springing dead load
Intensity, f are rise；
The actual arch 1 of the bridge and dead load thrust line 2 are as shown in Figure 1, the actual arch 2 of left one side of something is located at dead load thrust line 1
Lower section, the right actual arch 2 of one side of something are located at the top of dead load thrust line 1.
Specific adjustment mode is according to the present invention：Increase the arch axis coefficient of the dead load thrust line of left half of arch, subtract simultaneously
The arch axis coefficient of the dead load thrust line of small right half of arch.
According to formulaIt understands：
Left one side of something should be increased, reduce it is left half of, reduce it is right half of, increase it is right half of.Cause
This, applies weight concrete on right half of hogback, reduces the dead load hogging moment of left semiarch arch springing, increase the perseverance of right semiarch arch springing
Moment of flexure is loaded with, makes the dead load internal force of arch springing at two tend to be close.
After applying weight concrete, the deviation of the arch of dead load thrust line and main arch ring is significantly reduced, significantly
The stress of main arch ring is improved, clearly, the stress of main arch ring and deformation disclosure satisfy that code requirement to effect.
Claims (4)
- A kind of 1. method that spandrel arch bridge is reinforced using adjustment dead load thrust line, it is characterised in that：Include following step successively Suddenly：A. the actual arch of arch bridge by the way of field survey, is determined according to the both stateful of spandrel arch bridge first；B. according to the actual dead load of arch bridge, its dead load thrust line is determined, the equation of dead load thrust line is：Wherein, m is arch axis coefficient, gjIntensity, g are distributed for vault dead loaddIt is distributed for arch springing dead load Intensity, f are rise, and chk ξ are hyperbolic cosine；C. the deviation of actual arch and dead load thrust line is compared, adjusts dead load thrust line, dead load thrust line is made to try one's best and reality Arch overlaps；Specifically method of adjustment is：The curve location relation of dead load thrust line and actual arch is first determined whether, it is then determined that applying the position of weight concrete With with weight, i.e.,：（1）If dead load thrust line in the top of actual arch, should increase the arch axis coefficient m of dead load thrust line, make dead load pressure The y values of the line of force reduce；According to formulaIt understands, should increased amount be needed according to arch axis coefficient m, really Moment of flexure at fixed 1/4 span of archMoment of flexure at incrementss and arch springingReduction amount, so that it is determined that needing what is applied to match somebody with somebody on hogback The position of loaded concrete and with weight；（2）If dead load thrust line in the lower section of actual arch, should reduce the arch axis coefficient m of dead load thrust line, make dead load pressure The y values of the line of force increase；According to formulaIt understands, the amount reduced should be needed according to arch axis coefficient m, really Moment of flexure at fixed 1/4 span of archMoment of flexure at reduction amount and arch springingIncrementss, so that it is determined that needing what is applied to match somebody with somebody on hogback The position of loaded concrete and with weight.
- 2. the method according to claim 1 that spandrel arch bridge is reinforced using adjustment dead load thrust line, it is characterised in that：When When the main arch ring cross-section of arch bridge need not increase, used weight concrete only makes structure driven bearing by counterweight effect to adjust Arch ring internal force；When arch bridge main arch ring cross-section needs to increase, it usually needs increase the position in section and the position of weight concrete It is identical, by the way of the bar planting casting concrete on main arch ring, make weight concrete and main arch ring formed it is whole, jointly by Power, while play the role of increasing section and adjustment arch ring internal force.
- 3. the method according to claim 1 that spandrel arch bridge is reinforced using adjustment dead load thrust line, it is characterised in that：Institute The intensity of the weight concrete of use is identical or slightly higher with the concrete strength of the main arch ring of arch bridge.
- 4. the method according to claim 1 that spandrel arch bridge is reinforced using adjustment dead load thrust line, it is characterised in that：This Method, which is suitable for intrinsic dead load thrust line and the arch of main arch ring, certain deviation or the dead load after runing for many years The spandrel arch bridge that the actual arch of pressure line and main arch ring deviates.
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| CN201711373586.6A CN108086172A (en) | 2017-12-19 | 2017-12-19 | A kind of method that spandrel arch bridge is reinforced using adjustment dead load thrust line |
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| CN201711373586.6A CN108086172A (en) | 2017-12-19 | 2017-12-19 | A kind of method that spandrel arch bridge is reinforced using adjustment dead load thrust line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371804A (en) * | 2018-09-22 | 2019-02-22 | 胡常福 | A kind of empty stomach Deck Arch Bridges optimal distance and its determining method |
| CN111364378A (en) * | 2020-03-12 | 2020-07-03 | 中铁大桥局武汉桥梁特种技术有限公司 | Method for dismantling double-arch bridge |
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| CN102322026A (en) * | 2011-08-24 | 2012-01-18 | 重庆交通大学 | Reinforcing method of masonry arch bridge |
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| WO2017014660A1 (en) * | 2015-07-21 | 2017-01-26 | Fonseca João | Structural system for arch bridges, with mobilization of external reactions through definitive ties |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371804A (en) * | 2018-09-22 | 2019-02-22 | 胡常福 | A kind of empty stomach Deck Arch Bridges optimal distance and its determining method |
| CN111364378A (en) * | 2020-03-12 | 2020-07-03 | 中铁大桥局武汉桥梁特种技术有限公司 | Method for dismantling double-arch bridge |
| CN111364378B (en) * | 2020-03-12 | 2021-07-20 | 中铁大桥局武汉桥梁特种技术有限公司 | Method for dismantling double-arch bridge |
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