CN101343861A - Construction method for replacing old frame bridge by new frame bridge in existing railway lines - Google Patents
Construction method for replacing old frame bridge by new frame bridge in existing railway lines Download PDFInfo
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- CN101343861A CN101343861A CNA2008100542067A CN200810054206A CN101343861A CN 101343861 A CN101343861 A CN 101343861A CN A2008100542067 A CNA2008100542067 A CN A2008100542067A CN 200810054206 A CN200810054206 A CN 200810054206A CN 101343861 A CN101343861 A CN 101343861A
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Abstract
Disclosed is a construction method for replacing the old frame bridge by a new frame bridge on the existing railway. The construction method comprises the required jacking force of the old frame bridge according to the formula; the existing railway line is strengthened; a line strengthening system and a reinforcing steel bar drawing ring are tightened through a jack; a lately supplemented triangular block is arranged at the rear end of the bottom plate of the old frame bridge; a cantilever bracket is arranged; a new bridge back is arranged, and a jacking column and a jacking pickaxe are respectively arranged between the new frame bridge and the new bridge back and between the old frame bridge and the cantilever bracket; a plurality of thixotropic slurry holes are formed on both sides of the old frame bridge and the bottom surface of the bottom plate, and thixotropic slurry is filled into the thixotropic slurry holes; the old frame bridge is jacked out; when the old frame bridge is jacked out, the new frame bridge is jacked in. Under the precondition that the railway operation is not interrupted, the construction method can rapidly jack the old frame bridge out, the application scope is wide, and the construction method can not be limited by time and space. In addition, because the conventional reinforcement method of a lock rail plus longitudinal and horizontal beams is adopted in the existing railway line, the construction method is suitable for various railway situations such as a straight line section and the curved line section, and the security is high.
Description
Technical field
The invention belongs to a kind of railway engineering job practices, particularly relate to a kind of job practices of replacing old frame bridge by new frame bridge in existing railway lines.
Background technology
Frame bridge is arranged on the intersection of rail track and road usually, mainly is made of top board, side panel (side body of wall), base plate and ancillary facility.Wherein the existing railway circuit is arranged on the end face of frame bridge, and the road that is positioned at frame bridge bottom is the perpendicular or oblique with rail track then.Carry out raising with people's living standard fast along with the urbanization construction, some existing public transit facility can not satisfy fast-developing society need, and therefore reconstructing, extend on the basis of existing structure has become the common project of constructing in the present city.Road can be by widening the generation that reduces the traffic congestion phenomenon, but, the narrow frame bridge that is under the existing railway circuit just becomes the unimpeded bottleneck of road completely, how narrow old frame bridge is abolished, simultaneously roomy new frame bridge is headed into, become the new research direction of frame bridge jacking construction.
The job practices of in the past removing old frame bridge jacking new frame bridge mainly is to adopt just that beam adds the existing railway circuit that is seated on the old frame bridge end face, utilize the crisscross mode of sleeper buttress and i iron to support old frame bridge, and cut the both wings and the base plate of old frame bridge with the patterning method piecemeal, then use jack jacking new frame bridge.When installing just beam, this method need seal rail track, will influence the normal operation of railway like this, and owing to be subjected to the just restriction of beam span, thereby can not satisfy the requirement of width frame bridge greatly, and when the existing railway circuit is curved section or multiply road, sweep and distance between centers of tracks are all had strict restriction, and just beam can not be used for track switch simultaneously.Another kind of job practices is to adopt blasting method to remove old frame bridge, and jacking new frame bridge promptly adopts blasting procedure that old frame bridge is removed then, uses jack jacking new frame bridge then.But this method bursting work application difficulty, blasting quality is wayward simultaneously, and is big to surrounding environment influence, and safety is relatively poor.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of applied range that has, be not subjected to time and spatial constraints, be adapted to different kinds of railways circuit situations such as straightway and curved section, and safety is good, in track strengthening and jack-in process, need not to interrupt railway operation, only need the restriction train speed to get final product, thereby influencing railway, normally to run degree low, simultaneously move speed is than very fast, so possess the job practices of the replacing old frame bridge by new frame bridge in existing railway lines of advantages such as reduction of erection time greatly.
In order to achieve the above object, the job practices of replacing old frame bridge by new frame bridge in existing railway lines provided by the invention comprises the following step that carries out in order:
1) calculate the required jacking power of old frame bridge according to formula, and according to mending corner block behind quantity, model and size, the old bridge of result of calculation to fore-set and top pick and the bracket reinforcement ratio designs;
2) the existing railway circuit that will be positioned at old frame bridge top is cleaned out, and adopts conventional 3-5-3 button rail to add in length and breadth the reinforcing mode of beam the existing railway circuit is reinforced, to form the track strengthening system;
3) with jack reinforcing bar draw ring pre-buried on track strengthening system and the new frame bridge top board is strained;
4) when existing railway circuit and road oblique, the base plate rear end that corner block is arranged on old frame bridge will be mended behind a plurality of old bridge that design in the step 1), install by parallel center line direction with assurance fore-set and top pick, thereby guarantee that the new frame bridge heads into along the center line direction;
5) on the top board surface of new frame bridge a plurality of cross sections are set and are trapezoidal or rectangular bracket, the hypotenuse of mending corner block behind the side that makes bracket simultaneously and the base plate rear end of old frame bridge or the old bridge parallels, and the position is corresponding mutually;
6) at the rear of new frame bridge new bridge back is set, fore-set is installed respectively and is pushed up pick mending between the base plate rear end of new frame bridge or new bridge corner block and the new bridge back and behind the base plate rear end of old frame bridge or the old bridge between the corresponding bracket of corner block and new frame bridge in succession then;
7) ancillary facility such as the barricade of leading the way of the old frame bridge of dismounting, the benefit basil, then with luoyang spade from the both sides of old frame bridge and the base plate bottom surface form a plurality of thixotropic slurries hole along the width of old frame bridge, in this hole, inject thixotropic slurry with grouting pump then, on the both sides of old frame bridge and base plate bottom surface, to form the mud curtain;
8) utilize the top pick link to each other with old frame bridge base plate both sides respectively to apply top power, make old frame bridge carry out the trace rotation in position, to eliminate the bonding between itself and ground;
9) soil that will be positioned at pick below, top digs out and removes, with jack the jacking equipment between new frame bridge and the tension of track strengthening system and new bridge corner block and the new bridge back is being held startup top pick under the power state then, old frame bridge is ejected the distance of above-mentioned shoveling to the direction that deviates from the new frame bridge, to push up pick withdrawal afterwards, restart top pick, and in the tension jack, utilize top pick with the distance of new frame bridge to the above-mentioned shoveling of direction jacking of old frame bridge, to push up pick withdrawal then, increase fore-set afterwards, top iron, restart top pick to holding the power state, repeating said process at last is ejected until old frame bridge, the new frame bridge heads into the designing requirement position simultaneously, thereby finishes whole construction course.
Thixotropic slurry bore dia in the described step 7) is Φ 150mm.
The job practices of replacing old frame bridge by new frame bridge in existing railway lines provided by the invention can eject old frame bridge under the prerequisite of not interrupting railway operation quickly and easily, applied range not only, and be not subjected to the restriction in time and space.In addition, because the existing railway circuit is to adopt the button rail to add the conventional reinforcing mode of beam in length and breadth, therefore be applicable to different kinds of railways circuit situations such as straightway and curved section, and safe, and have can the reduction of erection time, easy construction simply reaches advantages such as construction cost is low.
Description of drawings
Fig. 1 is new, old frame bridge and existing railway circuit relative position structural representation before utilizing job practices provided by the invention and constructing.
Structural representation when Fig. 2 carries out in the work progress existing railway circuit reinforced for utilizing job practices provided by the invention.
Structural representation when Fig. 3 carries out in the work progress jack being set for utilizing job practices provided by the invention.
Fig. 4 carries out in the work progress bracket being set and new structural representation when mending corner block on old frame bridge on the new frame bridge for utilizing job practices provided by the invention.
Structural representation when Fig. 5 carries out being provided with in the work progress fore-set and top pick for utilizing job practices provided by the invention.
Structural representation when Fig. 6 carries out using in the work progress luoyang spade to form the thixotropic slurry hole for utilizing job practices provided by the invention.
Structural representation when Fig. 7 carries out in the work progress old frame bridge ejected in advance for utilizing job practices provided by the invention.
Structural representation when Fig. 8 carries out in the work progress ejecting old frame bridge with the new frame bridge for utilizing job practices provided by the invention.
Symbol description among the figure:
1---old frame bridge; 2---the new frame bridge; 3---the track strengthening system;
31---the existing railway circuit; 35---the reinforcing bar draw ring; 36---jack;
41---bracket; 42---mend corner block behind the old bridge; 43---the new bridge base plate;
44,54---fore-set; 45,55---top pick; 46---new bridge back;
50---new bridge corner block 51---thixotropic slurry hole;
Specific implementation method
The job practices of new frame bridge under the existing railway circuit provided by the invention being changed old frame bridge below in conjunction with the drawings and specific embodiments is elaborated.
Shown in Fig. 1～8, the job practices of replacing old frame bridge by new frame bridge in existing railway lines provided by the invention comprises the following step that carries out in order:
1) calculates the required jacking power of old frame bridge 1 according to formula, and mend corner block 42 after to fore-set 44,54 and quantity, model and the size of top pick 45,55, old bridge and bracket 41 reinforcement ratio design according to result of calculation;
Old frame bridge top power design formulas: P=K[N
1f
1+ (N
1+ N
2) f
2+ 2Ef
3+ RA]
In the formula: N
1f
1---the end face frictional resistance
N
1---track strengthening is heavy
N
2---dead load
(N
1+ N
2) f
2---the bottom surface frictional resistance
f
1, f
2---friction factor
2Ef
3---the side frictional resistance
E=0.5 ξ γ H
2B---quiet earth lateral pressure
RA---basil frontal drag is ignored in this job practices
K---design factor is got K=1.2
2) the existing railway circuit 31 that will be positioned at old frame bridge 1 top is cleaned out, and adopt conventional 3-5-3 button rail to add in length and breadth the reinforcing mode of beam existing railway circuit 31 is reinforced, to form track strengthening system 3, wherein detain rail and adopt common rail, beam then adopts the bigger i iron of model in length and breadth, purpose is not influence under the normal prerequisite of runing of railway in assurance old frame bridge 1 is ejected fast, simultaneously new frame bridge 2 is headed into;
3) with jack 36 reinforcing bar draw ring pre-buried on track strengthening system 3 and new frame bridge 2 top boards 35 is strained, traversing to prevent that existing railway line road 31 from producing;
4) when existing railway circuit 31 and road oblique, the base plate rear end that corner block 42 is arranged on old frame bridge 1 will be mended behind a plurality of old bridge that design in the step 1), install by parallel center line direction with assurance fore-set 44 and top pick 45, thereby guarantee that new frame bridge 2 heads into along the center line direction; Because existing corner block can not satisfy the needs of new and old bridge displacement construction on the old frame bridge 1, so existing corner block need be cut, and according to top power result of calculation arrangement of reinforcement, concreting again, in addition, mend behind the old bridge corner block 42 reinforcing bar must with the reinforcing bar firm welding of old frame bridge 1 upper plate; In addition, after then not needing old bridge is set during with the road orthogonal, existing railway circuit 31 do not mend corner block 42;
5) on the top board surface of new frame bridge 2 a plurality of cross sections are set and are trapezoidal or rectangular bracket 41, the hypotenuse of mending corner block 42 behind the side that makes bracket 41 simultaneously and the base plate rear end of old frame bridge 1 or the old bridge parallels, and the position is corresponding mutually; This is because new frame bridge 2 is different with the clear height of old frame bridge 1, usually new frame bridge 2 is slightly high, thereby the base plate that causes two bridges is not to be positioned at same horizontal plane, so jacking equipment can't be installed between new frame bridge 2 and old frame bridge 1, so adopt the mode of putting bracket 41 on the top board surface that new frame bridge 2 is established, with eject " back " as old frame bridge 1, eject in place after immediately with its dismounting; In addition, because bracket 41 can be in associating stress curved, that cut, turn round in work progress, so install template after should reinforcing bar binding being finished in strict accordance with designing requirement, and bracket concrete must be finished with the concrete one-time-concreting on new frame bridge 2 top boards;
6) at the rear of new frame bridge 2 new bridge back 46 is set, then in succession between the base plate rear end of new frame bridge 2 or new bridge corner block 50 and the new bridge back 46 and mend behind the base plate rear end of old frame bridge 1 or the old bridge between the corresponding bracket 41 of corner block 42 and new frame bridge 2 fore-set 54 is installed respectively, 44 and the top pick 55,45; Should multiply by 1.8 times coefficient according to the result who calculates in the step 1) above-mentioned jacking equipment is set;
7) ancillary facility such as the barricade of leading the way of the old frame bridge 1 of dismounting, the benefit basil, to reduce the front frictional resistance of old frame bridge 1, then with luoyang spade from the both sides of old frame bridge 1 and the base plate bottom surface form the thixotropic slurry hole 51 that a plurality of diameters are Φ 150mm along the width of old frame bridge 1, old frame bridge 1 is broken away from mutually with surrounding soil, in this hole, inject thixotropic slurry with grouting pump then, on the both sides of old frame bridge 1 and base plate bottom surface, forming the mud curtain, thereby reduce frictional resistance;
In addition, described thixotropic slurry is formulated according to certain ratio by sodium bentonite, soda ash and water, and it is to the supporting and the high lubricating effect of soil layer.In addition, the mud jacking point pressure is generally got (1.0-1.2) γ H.
8) utilize the top pick 45 link to each other with old frame bridge 1 base plate both sides respectively to apply top power, make old frame bridge 1 carry out the trace rotation in position,, shown in arrow A, B among Fig. 7, promptly old frame bridge 1 is ejected in advance to eliminate the bonding between itself and ground;
9) soil that will be positioned at pick 45 belows, top digs out and removes, with jack 36 the jacking equipment between new frame bridge 2 and 3 tensions of track strengthening system and new bridge corner block 50 and the new bridge back 46 is being held startup top pick 45 under the power state then, to guarantee that the top power that is applied on the old frame bridge 1 finally acts on the new bridge back 46, thereby old frame bridge 1 is ejected the distance of above-mentioned shoveling to the direction that deviates from new frame bridge 2, to push up pick 45 afterwards regains, restart top pick 55, and in tension jack 36, utilize top pick 55 with the distance of new frame bridge 2 to the above-mentioned shoveling of direction jacking of old frame bridge 1, to push up pick 55 then regains, increase fore-set afterwards, top iron, restart top pick 55 to holding the power state, repeating said process at last is ejected until old frame bridge 1, new frame bridge 2 heads into the designing requirement position simultaneously, thereby finishes whole construction course.In addition, should be noted that the control of two bridge center lines, elevation in the jack-in process, can transmit according to designing requirement, prevent the stress raisers problem thus to guarantee top power.
Claims (2)
1, a kind of job practices of replacing old frame bridge by new frame bridge in existing railway lines is characterized in that: described job practices comprises the following step that carries out in order:
1) calculate the required jacking power of old frame bridge (1) according to formula, and according to mending corner block (42) behind quantity, model and size, the old bridge of result of calculation to fore-set (44,54) and top pick (45,55) and bracket (41) reinforcement ratio designs;
2) the existing railway circuit (31) that will be positioned at old frame bridge (1) top is cleaned out, and adopts conventional 3-5-3 button rail to add in length and breadth the reinforcing mode of beam existing railway circuit (31) is reinforced, to form track strengthening system (3);
3) with jack (36) reinforcing bar draw ring (35) pre-buried on track strengthening system (3) and new frame bridge (2) top board is strained;
4) when existing railway circuit (31) and road oblique, the base plate rear end that corner block (42) is arranged on old frame bridge (1) will be mended behind a plurality of old bridge that design in the step 1), install by parallel center line direction with assurance fore-set (44) and top pick (45), thereby guarantee that new frame bridge (2) heads into along the center line direction;
5) on the top board surface of new frame bridge (2) a plurality of cross sections are set and are trapezoidal or rectangular bracket (41), the hypotenuse of mending corner block (42) behind the side that makes bracket (41) simultaneously and the base plate rear end of old frame bridge (1) or the old bridge parallels, and the position is corresponding mutually;
6) at the rear of new frame bridge (2) new bridge back (46) is set, then in succession between the base plate rear end of new frame bridge (2) or new bridge corner block (50) and the new bridge back (46) and mend behind the base plate rear end of old frame bridge (1) or the old bridge between the corresponding bracket (41) of corner block (42) and new frame bridge (2) fore-set (54 is installed respectively, 44) and the top pick (55,45);
7) remove old frame bridge (1) the barricade of leading the way, mend ancillary facility such as the basil, then with luoyang spade from the both sides of old frame bridge (1) and the base plate bottom surface form a plurality of thixotropic slurries hole (51) along the width of old frame bridge (1), in this hole, inject thixotropic slurry with grouting pump then, on the both sides of old frame bridge (1) and base plate bottom surface, to form the mud curtain;
8) utilize the top pick (45) link to each other with old frame bridge (1) base plate both sides respectively to apply top power, make old frame bridge (1) carry out the trace rotation in position, to eliminate the bonding between itself and ground;
9) soil that will be positioned at top pick (45) below digs out and removes, with jack (36) the jacking equipment between new frame bridge (2) and track strengthening system (3) tension and new bridge corner block (50) and the new bridge back 46 is being held startup top pick (45) under the power state then, old frame bridge (1) is ejected the distance of above-mentioned shoveling to the direction that deviates from new frame bridge (2), to push up pick (45) withdrawal afterwards, restart top pick (55), and in tension jack (36), utilize top pick (55) with the distance of new frame bridge (2) to the above-mentioned shoveling of direction jacking of old frame bridge (1), to push up pick (55) withdrawal then, increase fore-set afterwards, top iron, restart top pick (55) to holding the power state, repeating said process at last is ejected until old frame bridge (1), new frame bridge (2) heads into the designing requirement position simultaneously, thereby finishes whole construction course.
2, the job practices of replacing old frame bridge by new frame bridge in existing railway lines according to claim 1 is characterized in that: thixotropic slurry hole (51) diameter in the described step 7) is Φ 150mm.
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|---|---|---|---|
| CN2008100542067A CN101343861B (en) | 2008-08-22 | 2008-08-22 | Construction method for replacing old frame bridge by new frame bridge in existing railway lines |
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|---|---|---|---|
| CN2008100542067A CN101343861B (en) | 2008-08-22 | 2008-08-22 | Construction method for replacing old frame bridge by new frame bridge in existing railway lines |
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| CN101343861A true CN101343861A (en) | 2009-01-14 |
| CN101343861B CN101343861B (en) | 2010-06-02 |
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| CN106702912A (en) * | 2016-11-16 | 2017-05-24 | 中铁六局集团天津铁路建设有限公司 | Construction method of dismantling old beam top and introducing new bridge on existing railway |
| CN107447672A (en) * | 2017-09-13 | 2017-12-08 | 中铁六局集团天津铁路建设有限公司 | The construction method of jacking casing under a kind of hump line |
| CN107447672B (en) * | 2017-09-13 | 2018-10-12 | 中铁六局集团天津铁路建设有限公司 | The construction method of jacking babinet under a kind of hump line |
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| CN111593665A (en) * | 2020-05-09 | 2020-08-28 | 中铁第五勘察设计院集团有限公司 | Bridge construction method integrating dismantling and construction |
| CN111910538A (en) * | 2020-07-02 | 2020-11-10 | 中铁六局集团有限公司 | Construction method for dismantling existing frame bridge by using rope saw reverse cutting method |
| CN113742829A (en) * | 2021-09-03 | 2021-12-03 | 中国铁路设计集团有限公司 | Bridge structure arbitrary section reading processing and section characteristic calculating method |
| CN113742829B (en) * | 2021-09-03 | 2023-06-20 | 中国铁路设计集团有限公司 | Method for reading and processing arbitrary section of bridge structure and calculating section characteristics |
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