CN103290786A - System and method for rapidly reinforcing railway bridge by external prestressing - Google Patents
System and method for rapidly reinforcing railway bridge by external prestressing Download PDFInfo
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- CN103290786A CN103290786A CN2013101647461A CN201310164746A CN103290786A CN 103290786 A CN103290786 A CN 103290786A CN 2013101647461 A CN2013101647461 A CN 2013101647461A CN 201310164746 A CN201310164746 A CN 201310164746A CN 103290786 A CN103290786 A CN 103290786A
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Abstract
The invention discloses a system and a method for rapidly reinforcing a railway bridge by external prestressing. The system is characterized in that prestressed reinforcing steel bars tightened between web plates on two sides are assembled on two sides of diaphragm plates of T beams, prefabricated concrete diaphragm plates perpendicular to the web plates are additionally arranged among the diaphragm plates, and prestressed reinforcing steel bars tightened between the web plates on the two sides are also assembled in the prefabricated concrete diaphragm plates. The system and the method have the advantages that traffic closing is unneeded during reinforcing, so that no influence on operation is achieved; a construction period is short, economic benefits are obvious, required concrete slabs and the prestressed reinforcing steel bars can be prefabricated in factories, and protecting caps, spacers and the like used by anchoring of the prestressed reinforcing steel bars are the same in size, so that a series of prefabricated standard parts are formed; damage to original structures is small, concrete strength cannot become lower while concrete performance cannot become poorer, clearance under bridge can be unaffected, and grade elevation cannot be increased; influences on stress of abutments and foundations are small, reinforcing of the abutments and the foundations can be saved, and bending resistance and shear resistance of the T beams are improved remarkably; maintenance management is less after reinforcing.
Description
Technical field
The present invention relates to the railroad bridge field of civil engineering, be specifically related to a kind of system and method for utilizing external prestressing reinforcing bar and precast concrete plank that double-disk T sections road and bridge beam superstructure is reinforced fast.
Technical background
The railroad bridge of China is most of by being built after the founding of the state, bridge age is generally in 30～50 years, the domestic overwhelming majority adopts the concrete prefabricated T beam of split blade type always, span is that 32m and following simply supported girder bridge account for 80%, though it is generally on the low side to have gone through repeatedly the improvement split blade type T beam lateral stiffness of standard map.Phenomenons such as existing many bridges generations at present are aging, crack, breakage, unsafe bridge increases year by year, and supporting capacity obviously descends.In recent years along with the continuous speed-raising of railway, provide requirement safe, quick, that heavy duty is travelled also more and more higher to railway, train obviously increases the impact of line bridge device, especially on aged bridge, once repeatedly took place to damage because reasons such as bridge vibration is excessive cause bridge construction, so that it is a lot of that train accident of off-line on bridge takes place.
In order to satisfy the requirement of train speed raising, need reinforce bridge, traditional reinforcement means is to set up level board to improve lateral stiffness in T lower flange of girder edge place total length, the analysis showed that consolidation effect will be no longer remarkable when level board length surpasses 16m.And existing reinforcement means is big to the interference of transportation, cost is high, and it is bigger to increase deadweight simultaneously, considers behind bridge pier and the beam body coupled vibrations improving integral bridge lateral stiffness DeGrain.Adopt external prestressing rapid reinforcement technology of the present invention that bridge is reinforced and can be good at addressing this problem, and expense is about 60%～70% of other reinforcement means expenses.
Summary of the invention
External prestressing rapid reinforcement technology of the present invention is as a kind of reinforcement means of active, be as force application means with steel such as bar reinforcement, steel strand or high tensile steel wires, structure is applied external prestressing, offset the internal force that the part external load produces with the recurvation square that pre-applied force produces, improve the structure functional performance and improve its ultimate bearing capacity thereby reach, and the purpose that in reinforcing process, does not need close traffic.
Solution of the present invention is on the basis of existing reinforcing technique, provide more economically a kind of, efficient and optimize novel external prestressing method for rapidly reinforcing, according to external prestressing rapid reinforcement technology of the present invention, to arrange the precast concrete diaphragm of reserving the prestressed reinforcement duct along overall length of bridge, variation by tension of prestressed tendon stress and arrangement form, make bridge internal force redistribution and effectively improve the lateral stiffness of bridge, thus two T beams that make double-disk T type bridge better collaborative work improved the effect of bridge strengthening significantly.
The main body of railroad bridge of the present invention is a kind of double-disk T type bridge, and it is made of two paired T beams; Between the web of two T beams, be provided with several rows of perpendicular to web and with the web structure be the diaphragm of one.The invention reside in: be equipped with the prestressed reinforcement of tension between the web of both sides in the diaphragm both sides.And, between diaphragm, set up the precast concrete diaphragm perpendicular to web, in the precast concrete diaphragm, also be equipped with the prestressed reinforcement of tension between the web of both sides.
Benefit of the present invention and advantage are:
1, need not carry out wet trade, stress reinforcing technique equipment needed thereby is simple, human input is few, construction period is short, and economic benefit is obvious, and required concrete slab and prestressed reinforcement all can be prefabricated in the factory, simple operations is only carried out at the scene, close traffic not in the reinforcing process, less to structure operation influence, can under the condition that does not limit use, carry out strengthening construction.
2, less to original structure damage, can not make the concrete strength step-down and degradation can accomplish not influence under-clearance, and not increase grade elevation.
3, external prestressing strengthening need not to increase end face, can not influence architectural space.
4, the increase constant weight is few, so it is very little to pier and the influence of basic stress situation, can save the reinforcing to pier and basis, and the mechanical relationship of consolidation effect clearly can be regulated the stress state in the original structure flexibly, can improve and adjust the stressing conditions of original structure greatly, improve rigidity, the crack resistance of load-carrying members.The maximum load-carrying capacity that can reach after reinforcing is relevant with reinforcement ratio and the concrete strength of former beam, generally speaking, the original structure bearing capacity can be improved 40%～50%.
When 5, having significantly improved bending resistance, the shear-carrying capacity of T type beam, can improve bridge in the performance of operational phase.
6, the maintenance management work after the reinforcing is less.
7, the reserving hole channel by the precast concrete diaphragm carries out stretch-draw and the anchoring of prestressed reinforcement at the Liang Leichu of T beam, thereby makes diaphragm and two T beams form whole co-operation.
8, the concrete diaphragm of using in the reinforcement means and prestressed reinforcement all can carry out prefabricated according to standard map in factory, the protective cap that the prestressed reinforcement anchoring is used and pad equidimension all are identical, thereby form a series of prefabrication standard component.
9, classification, subsection tension are adopted in prestressed reinforcement stretch-draw, and the prestressed reinforcement arrangement adopts linear.
Description of drawings
Fig. 1 is the elevation of double-disk T type bridge
Fig. 2 is A-A section (left side turn 90 degrees) figure among Fig. 1, namely has diaphragm place profile.
Fig. 3 is B-B section (left side turn 90 degrees) figure among Fig. 1, namely increases precast concrete diaphragm place profile newly.
Fig. 4 is precast concrete diaphragm figure.
Fig. 5 is the local figure of prestressed reinforcement anchoring.
Among the figure: the 1st, double-disk T type bridge, 1-1 is web, the 2nd, diaphragm, the 3rd, precast concrete diaphragm, the 4th, prestressed reinforcement, the 5th, stretch-draw hole, the 6th, protective cap, the 7th, pad.
The specific embodiment
Referring to Fig. 1-Fig. 5, the present invention reinforces railroad bridge system and method thereof fast for a kind of external prestressing, and the main body of railroad bridge of the present invention is a kind of double-disk T type bridge 1, and it is made of two paired T beams; Between the web 1-1 of two T beams, be provided with several rows of perpendicular to web 1-1 and with web 1-1 structure be that the diaphragm 2(said structure of one is existing structure).The invention reside in: be equipped with the prestressed reinforcement 4 of tension between the web 1-1 of both sides in diaphragm 2 both sides.The prestressed reinforcement 4 of diaphragm 2 each side is the 2-4 root.And, set up precast concrete diaphragm 3 perpendicular to web 1-1 2 of diaphragms, in precast concrete diaphragm 3, also be equipped with the prestressed reinforcement 4 of tension between the web 1-1 of both sides.Described prestressed reinforcement 4 is the 4-6 root.See shown in Figure 4ly, be shaped on stretch-draw hole 5 in the precast concrete diaphragm 3 in advance, stretch-draw hole 5 is similarly the 4-6 hole, evenly distributes in precast concrete diaphragm 3.During installation, each prestressed reinforcement 4 is through in the stretch-draw hole 5, and tension is between the web 1-1 of both sides.Prestressed reinforcement 4 two ends of diaphragm 2 both sides and prestressed reinforcement 4 two ends in the precast concrete diaphragm 3 are anchored at respectively by protective cap 6 on the web 1-1 on both sides.Between protective cap 6 and the web 1-1 outside, be equipped with pad 7.
Described prestressed reinforcement also can replace with steel strand.
External prestressing of the present invention is reinforced the preparation method of railroad bridge fast, may further comprise the steps:
A, precast concrete diaphragm, prestressed reinforcement, protective cap and pad etc.;
Handle at B, the web interface that prestressed reinforcing bar place is desired in former diaphragm both sides;
C, the web interface of setting up precast concrete diaphragm place is handled;
D, installation precast concrete diaphragm, prestressed reinforcement passes the stretch-draw hole in the concrete diaphragm;
E, pad are in place, with prestressed reinforcement stretch-draw, anchoring;
F, protective cap is installed at prestressed reinforcement two.
In described steps A, the precast concrete diaphragm should carry out prefabricated according to railroad bridge standard map relative dimensions.Prestressed reinforcement should carry out prefabricated in factory according to the size of diaphragm, should adopt cold drawn ⅣJi Gang muscle; Pad should adopt thickly to be made for the steel plate of 15-18mm, in centre-drilling hole; The size that protective cap should be taked to be complementary with prestressed reinforcement is carried out prefabricated.
In described step B, according to the prestressed reinforcement punch position hair and boring are cut a hole in the web both sides on both sides in original diaphragm both sides.
In described step C, hair is cut a hole in the web both sides on precast concrete diaphragm both sides, and holes at one side web earlier, treat that the precast concrete diaphragm is in place after, according to the accurate position of precast concrete diaphragm the another side web is holed.
In described step D, the precast concrete diaphragm is in place, and after prestressed reinforcement passed the stretch-draw hole, earlier prestressed reinforcement one side is carried out anchoring.Adjust precast concrete diaphragm and prestressed reinforcement position to guarantee that grinding one's teeth does not appear in the stretch-draw hole, crooked phenomenon.
In described step e, the web outside that prestressed reinforcement is passed both sides, and prestressed reinforcement carried out stretch-draw.Should be temporary fixed before the precast concrete diaphragm initial tensioning, produce when preventing stretch-draw displacement and train by the time drop.Prefabricated diaphragm and former diaphragm both sides prestressed reinforcement initial tensioning Stress Control are at 50kN, and whole stretch-draw stretching force is 200kN, and integral tension is pretensioning span centre section in proper order, then other sections of order stretch-draw.During each precast concrete diaphragm prestressed reinforcement stretch-draw, middle two of first simultaneous tension, other reinforcing bars of stretch-draw then.In stretching process when if micro-cracks appears in diaphragm bottom, should stop stretch-draw immediately and adjust back stretching force slightly.
In described step F, protective cap is installed at last, and protective cap is installed in every prestressed reinforcement anchoring both sides.Should guarantee before installing that prestressed reinforcement anchorage zone drying and unmatchful reinforcing bar cause the impurity of corrosion.The sealing that should bond after the protective cap fastening is handled, to guarantee to prevent sewage permeation.Before bonding sealing glue parches, tackle protective cap carry out temporary fixed, with prevent train by the time cause the opening and closing phenomenon.
The feature of external prestressing reinforcing bar rapid reinforcement technology of the present invention also is to have adopted pad, thereby has solved the anchored end problem of stress concentration effectively, has solved the concrete local compression and has carried hypodynamic problem.
Feature of the present invention is that also the external prestressing reinforcing bar passes in reserving hole, and the creationary protective cap of having used, thereby has created the environment of a sealing for prestressed reinforcement, has solved the corrosion problem of external prestressing reinforcing bar.
Adopt this reinforcement means to be particularly suitable for following several situation:
(1) because the structural bearing capacity that various diseases cause decline;
(2) needs improve the class of loading of bridge;
(3) need raising to the control of bridge vibration amplitude;
(4) the fatigue stress amplitude that is used for controlling beam body crack and reduces reinforcing bar;
(5) bridge strengthening duration weak point, and require uninterrupted traffic.
Claims (10)
1. an external prestressing is reinforced the railroad bridge system fast, and the main body of railroad bridge is double-disk T type bridge (1), and it is made of two paired T beams; Between the web 1-1 of two T beams, be provided with several rows of perpendicular to web 1-1 and with web 1-1 structure be the diaphragm 2 of one; It is characterized in that: be equipped with the prestressed reinforcement 4 of tension between the web 1-1 of both sides in diaphragm 2 both sides; And, between diaphragm 2, set up the precast concrete diaphragm 3 perpendicular to web 1-1, in precast concrete diaphragm 3, also be equipped with the prestressed reinforcement 4 of tension between the web 1-1 of both sides.
2. system according to claim 1 is characterized in that: the prestressed reinforcement 4 of diaphragm 2 each side is the 2-4 root; Prestressed reinforcement 4 in precast concrete diaphragm 3 is the 4-6 root.
3. system according to claim 1, it is characterized in that: be shaped on stretch-draw hole 5 in the precast concrete diaphragm 3 in advance, stretch-draw hole 5 is the 4-6 hole, evenly distributes in precast concrete diaphragm 3.
4. system according to claim 1, it is characterized in that: prestressed reinforcement 4 two ends of diaphragm 2 both sides and prestressed reinforcement 4 two ends in the precast concrete diaphragm 3 are anchored at respectively by protective cap 6 on the web 1-1 on both sides.Between protective cap 6 and the web 1-1 outside, be equipped with pad 7.
5. according to the described system of claim 1-4, it is characterized in that: described prestressed reinforcement also can replace with steel strand.
6. an external prestressing is reinforced the railroad bridge method fast, may further comprise the steps:
A, precast concrete diaphragm, prestressed reinforcement, protective cap and pad etc.;
Handle at B, the web interface that prestressed reinforcing bar place is desired in former diaphragm both sides;
C, the web interface of setting up precast concrete diaphragm place is handled;
D, installation precast concrete diaphragm, prestressed reinforcement passes the stretch-draw hole in the concrete diaphragm;
E, pad are in place, with prestressed reinforcement stretch-draw, anchoring;
F, protective cap is installed at prestressed reinforcement two.
7. system according to claim 6 is characterized in that:
In described steps A, the precast concrete diaphragm should carry out prefabricated according to railroad bridge standard map relative dimensions; Prestressed reinforcement should carry out prefabricated in factory according to the size of diaphragm, should adopt cold drawn ⅣJi Gang muscle; Pad should adopt thickly to be made for the steel plate of 15-18mm, in centre-drilling hole; The size that protective cap should be taked to be complementary with prestressed reinforcement is carried out prefabricated;
In described step B, according to the prestressed reinforcement punch position hair and boring are cut a hole in the web both sides on both sides in original diaphragm both sides;
In described step C, hair is cut a hole in the web both sides on precast concrete diaphragm both sides, and holes at one side web earlier, treat that the precast concrete diaphragm is in place after, according to the accurate position of precast concrete diaphragm the another side web is holed.
8. according to claim 6 or 7 described systems, it is characterized in that: in described step D, the precast concrete diaphragm is in place, and after prestressed reinforcement passed the stretch-draw hole, earlier prestressed reinforcement one side is carried out anchoring.Adjust precast concrete diaphragm and prestressed reinforcement position to guarantee that grinding one's teeth does not appear in the stretch-draw hole, crooked phenomenon.
9. system according to claim 8 is characterized in that: in described step e, and the web outside that prestressed reinforcement is passed both sides, and prestressed reinforcement carried out stretch-draw; Should be temporary fixed before the precast concrete diaphragm initial tensioning, produce when preventing stretch-draw displacement and train by the time drop; Prefabricated diaphragm and former diaphragm both sides prestressed reinforcement initial tensioning Stress Control are at 50kN, and whole stretch-draw stretching force is 200kN, and integral tension is pretensioning span centre section in proper order, then other sections of order stretch-draw; During each precast concrete diaphragm prestressed reinforcement stretch-draw, middle two of first simultaneous tension, other reinforcing bars of stretch-draw then.In stretching process when if micro-cracks appears in diaphragm bottom, should stop stretch-draw immediately and adjust back stretching force slightly.
10. system according to claim 9, it is characterized in that: in described step F, protective cap is installed at last, and protective cap is installed in every prestressed reinforcement anchoring both sides.Should guarantee before installing that prestressed reinforcement anchorage zone drying and unmatchful reinforcing bar cause the impurity of corrosion; The sealing that should bond after the protective cap fastening is handled, to guarantee to prevent sewage permeation; The reply protective cap carries out temporary fixed before bonding sealing glue parches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101647461A CN103290786A (en) | 2013-05-07 | 2013-05-07 | System and method for rapidly reinforcing railway bridge by external prestressing |
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| CN2013101647461A CN103290786A (en) | 2013-05-07 | 2013-05-07 | System and method for rapidly reinforcing railway bridge by external prestressing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106320189A (en) * | 2016-08-30 | 2017-01-11 | 中铁四局集团第四工程有限公司 | Transverse reinforcing construction method of existing railway line T beam |
| CN106758873A (en) * | 2016-11-11 | 2017-05-31 | 太原理工大学 | A kind of punching prestressing force strengthens the method that diaphragm plate is connected with girder |
| CN107142829A (en) * | 2017-07-06 | 2017-09-08 | 内蒙古综合交通科学研究院有限责任公司 | A kind of transverse prestress I-shaped box-beam structure |
| CN107165061A (en) * | 2017-07-04 | 2017-09-15 | 北京市市政四建设工程有限责任公司 | A kind of prestressed anchor and tensioning equipment |
| CN107288024A (en) * | 2017-07-25 | 2017-10-24 | 武汉理工大学 | Assembled beam body and its construction method |
| CN108425312A (en) * | 2018-05-22 | 2018-08-21 | 沙洲职业工学院 | A kind of precast prestressed modularization viaduct |
| CN109972535A (en) * | 2018-12-14 | 2019-07-05 | 中铁科学研究院有限公司 | Railway Simple T-Girders transverse prestress reinforcement means |
| CN113047186A (en) * | 2021-03-24 | 2021-06-29 | 华东交通大学 | Bridge reinforcing apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106320189A (en) * | 2016-08-30 | 2017-01-11 | 中铁四局集团第四工程有限公司 | Transverse reinforcing construction method of existing railway line T beam |
| CN106758873A (en) * | 2016-11-11 | 2017-05-31 | 太原理工大学 | A kind of punching prestressing force strengthens the method that diaphragm plate is connected with girder |
| CN107165061A (en) * | 2017-07-04 | 2017-09-15 | 北京市市政四建设工程有限责任公司 | A kind of prestressed anchor and tensioning equipment |
| CN107142829A (en) * | 2017-07-06 | 2017-09-08 | 内蒙古综合交通科学研究院有限责任公司 | A kind of transverse prestress I-shaped box-beam structure |
| CN107288024A (en) * | 2017-07-25 | 2017-10-24 | 武汉理工大学 | Assembled beam body and its construction method |
| CN107288024B (en) * | 2017-07-25 | 2020-01-31 | 武汉理工大学 | Assembled beam body and construction method thereof |
| CN108425312A (en) * | 2018-05-22 | 2018-08-21 | 沙洲职业工学院 | A kind of precast prestressed modularization viaduct |
| CN109972535A (en) * | 2018-12-14 | 2019-07-05 | 中铁科学研究院有限公司 | Railway Simple T-Girders transverse prestress reinforcement means |
| CN113047186A (en) * | 2021-03-24 | 2021-06-29 | 华东交通大学 | Bridge reinforcing apparatus |
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Application publication date: 20130911 |