CN102979041B - Soft overhead reinforcing jacking method for construction of span box bridge of jacking block of underpass turnout group of railway - Google Patents
Soft overhead reinforcing jacking method for construction of span box bridge of jacking block of underpass turnout group of railway Download PDFInfo
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- CN102979041B CN102979041B CN201210573745.8A CN201210573745A CN102979041B CN 102979041 B CN102979041 B CN 102979041B CN 201210573745 A CN201210573745 A CN 201210573745A CN 102979041 B CN102979041 B CN 102979041B
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Abstract
The invention discloses a soft overhead reinforcing jacking method for construction of a span box bridge of a jacking block of an underpass turnout group of a railway. The method comprises the steps of: arranging fulcrum piles symmetrically at both ends of an overhead line; splicing a cross beam and preparing a vertical beam; establishing a soft overhead system of the line in a slow travelling period of a train, and installing a sliding fulcrum assembly of a section of track; jacking a prefabricated box bridge in position by means of an interval when the train passes at a limited velocity; and finally disassembling the cross beam and the vertical beam. The method has the advantage that the cross beam and the dead load of a line device on a hole digging part under the line are mainly burdened by the vertical beam, and the force is transferred to a main fulcrum; when the train passes at the limited velocity, the cross beam on the hole digging part under the line, the dead load of the line device and the dynamic load of the train are mainly borne by the cross beam, and the force is respectively transferred to a box bridge top plate and a roadbed at both ends of the cross beam; and meanwhile, the soft overhead system can be used for large span overhead lines with multiple station tracks in a plane, turnout group in a station yard, curve and oblique crossing and the like.
Description
Technical field
The present invention relates to down and wear existing railway case bridge jacking construction method, especially relate to a kind of soft built on stilts reinforcing jacking of undercrossing tunnel turnout group jacking wide-span case bridge construction.
Background technology
Last century 70 and the eighties, under the built on stilts material worn in existing railway case bridge jacking construction method adopt the part rod member in " low-alloy steel assembled truss beam " (figure number: specially bridge-0119) and the assembled laggard row line of accessory is built on stilts reinforces more.Because the method accessory used when spelling is many especially, in work progress, accessory loses especially severe, causes very large waste.Afterwards by optimal design, the junction plate easily lost directly is welded on design attitude, is formed and horizontally lift beam column part, greatly reduce the quantity of accessory.To the nineties in last century, because on existing railway Business Line, a large amount of increasing builds overpass bridge, overpass bridge not only aperture is large, hole count is many, circuit becomes oblique state with case bridge center line and build again busy main line in or multiply road, field of standing, under turnout group or curve, railway interests also requires guaranteeing that the based uplink vehicle speed speed limit of traffic safety must not lower than 45km/h simultaneously, construction experience traditionally uses former horizontally lifts beam column part, must lift within case bay is reduced to 400mm by horizontal, change the concrete of existing railway pillow into sleeper could construct simultaneously, add work difficulty, and turnout group fixed track usage plan reinforcing aspect does not almost relate to.
Summary of the invention
The object of the present invention is to provide a kind of soft built on stilts reinforcing jacking of safe and reliable undercrossing tunnel turnout group jacking wide-span case bridge construction.
For achieving the above object, the present invention can take following technical proposals:
The soft built on stilts reinforcing jacking of undercrossing tunnel turnout group jacking wide-span case bridge construction of the present invention, it comprises following construction sequence:
The first step, fulcrum stake is laid
The two main fulcrum hole digging pile of row and secondary fulcrum hole digging piles are laid in the two ends of overhead wire symmetry, the interim fulcrum hole digging pile of two row or multi-row is laid between main fulcrum hole digging pile, corresponding to treating that the overhead wire opposite side of jacking prefabricated case beam is provided with anti-back stake, offer groove on the top of anti-back stake, in groove, be placed with location i iron;
Second step, assembledly horizontally lifts beam
Set up assembly jig in the front end of prefabricated case beam and both sides, assembledly on the top of assembly jig and prefabricated case beam horizontally lift beam, what be assembled into horizontally lifts the cross section width that beam length meets fixed track usage plan;
3rd step, makes longeron
I iron is connected into longeron by supramarginal plate, inframarginal and web;
4th step, sets up the soft built on stilts system of circuit
Go slowly period at train, by twice one group, longeron is seated on the main fulcrum hole digging pile laid along line direction, secondary fulcrum hole digging pile and interim fulcrum hole digging pile successively; Ballast tub under excavation sleeper, is arranged in through rear spaced horizontal successively horizontally lifts beam row by horizontal beam of lifting bottom longeron, and to lift on beam at the bottom of with hardwood plate supporting rail or at the bottom of sleeper horizontal; Then longeron and horizontal beam of lifting are connected as a single entity by U bolt, wood are set outside track and between longeron i iron and support fixing, horizontal beam, longeron and the circuit lifted is connected as a single entity; Horizontal beam row left side of lifting corresponding to precast box bridge position extends to the front top of precast box bridge, and right-hand member extends on the location i iron of anti-back stake upper end, locks onto on the i iron of location by U-shaped hang spring;
5th step; Section of track sliding fulcrum assembly is installed
Two lower sections of track laid by precast box bridge top board, lift below beam and interval, corresponding section, lower section of track position on precast box bridge top board fixedly mounts the section of track horizontal, rail contact face between the upper section of track and the lower section of track is shiny surface, and at the track upper surface coating butter of the lower section of track;
6th step, the jacking of precast box bridge
After the soft built on stilts Establishing of circuit, the gap after utilizing train speed limit to pass through, uses conventional method by place for the jacking of precast box bridge, is removed by interim fulcrum hole digging pile successively in jack-in process; Prefabricated case beam after in place forms support across overhead wire to it;
7th step, removes and horizontally lifts beam and longeron
Successively horizontal beam of lifting is extracted out by root, disintegrated, and backfill ballast aggregate in time, adjustment line level; Remove longeron and disintegrate.
The horizontal Liang Paishang of lifting between two longerons is provided with pressure beam, and described pressure beam is connected mutually by U bolt and described horizontal beam of lifting.
When the invention has the advantages that the jacking of case bridge is carried out in the gap passed through at train speed limit 45km/h, horizontal under circuit in borehole part lifts beam, line facility dead load is undertaken primarily of longeron i iron, and its power passes to main fulcrum stake; Train speed limit by time, case bridge stops jacking, and horizontal under circuit in borehole part is lifted beam, built-in unit dead load and Train induced load and lifted joist support load primarily of horizontal, its power pass to respectively horizontal lift beam two ends case bridge top board and roadbed on; Simultaneously this soft built on stilts system can meet multiply road in isoplanar, the large span fixed track usage plan of the stand states such as field turnout group, curve and oblique, be also convenient to the fixing of the equipment such as semaphore in turnout group, contact net bar.
Accompanying drawing explanation
Fig. 1 is that turnout group fixed track usage plan of the present invention reinforces model schematic cross-sectional view.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
Detailed description of the invention
As shown in Figure 1, 2, the soft built on stilts reinforcing jacking of undercrossing tunnel turnout group jacking wide-span case bridge construction of the present invention, it comprises following construction sequence:
The first step, fulcrum stake is laid
The two main fulcrum hole digging pile 1 of row and secondary fulcrum hole digging piles 2 are laid in the two ends of overhead wire symmetry, the interim fulcrum hole digging pile 3 of two row or multi-row is laid between main fulcrum hole digging pile 1, corresponding to treating that the overhead wire opposite side of jacking prefabricated case beam 4 is provided with anti-back stake 5, offer groove on the top of anti-back stake 5, in groove, be placed with location i iron 6;
Second step, assembledly horizontally lifts beam
Assembly jig is set up in the front end of prefabricated case beam and both sides, assembledly on the top of assembly jig and prefabricated case beam horizontally lift beam 7, horizontal beam 7 of lifting selects [3703] rod member of the dimensions such as 12 meters, 6 meters, 4 meters, 2 meters assembled back-to-back, and connect into design length by high-strength bolt, what be assembled into horizontally lifts the cross section width that beam 7 length meets fixed track usage plan;
3rd step, makes longeron
Select the I100 i iron of 16 meters, 8 meters that supramarginal plate, inframarginal and web high-strength bolt are connected into longeron 8;
4th step, sets up the soft built on stilts system of circuit
Go slowly period at train, by twice one group, longeron 8 is seated on the main fulcrum hole digging pile 1 laid along line direction, secondary fulcrum hole digging pile 2 and interim fulcrum hole digging pile 3 successively; Ballast tub under excavation sleeper, is arranged in through rear spaced horizontal successively horizontally lifts beam row by horizontal beam 7 of lifting bottom longeron 8, and to lift on beam at the bottom of with hardwood plate supporting rail or at the bottom of sleeper horizontal; Then longeron 8 and horizontal beam 7 of lifting are connected as a single entity by U bolt, two cap is all with by bolt; Arranging wood outside track and between longeron i iron supports fixing, and horizontal beam, longeron and the circuit lifted is connected as a single entity; Horizontal beam row (making again joist arrange) left side of lifting corresponding to precast box bridge 4 position extends to the front top of precast box bridge 4, right-hand member extends on the location i iron 6 of anti-back stake 5 upper end, locked onto on the i iron of location by U-shaped hang spring, prevent from driving circuit to move during 4 jacking of precast box bridge; Lift after beam 7 and longeron 8 install horizontal, need pressure beam 11 is installed between the line not arranging longeron; Pressure beam 11 generally arranges two groups, and two groups of misconnection are installed, and pressure beam 11 is fixed together by U bolt and horizontal beam 7 of lifting; Semaphore, contact net bar column are temporarily fixed at and horizontally lift on beam 7;
5th step; Section of track sliding fulcrum assembly is installed
Two lower sections of track 9 laid by precast box bridge 4 top board, lift below beam 7 and interval, corresponding section, the lower section of track 9 position on precast box bridge top board fixedly mounts the section of track 10 horizontal, rail contact face between the upper section of track 10 and the lower section of track 9 is shiny surface, and at the track upper surface coating butter of the lower section of track 9; The upper and lower section of track is formed by P12 light rail and Plate Welding, the rail level of the upper section of track 10 down, be fixed on U bolt and angle bar and horizontally lift beam 7 times, in precast box bridge 4 jack-in process, the upper section of track 10 is motionless, the lower section of track 9 moves forward with precast box bridge 4, with the upper section of track 10, relative sliding occurs, and load is passed to the upper section of track 10 by horizontal beam 7 of lifting and then passed to the lower section of track 9;
6th step, the jacking of precast box bridge
After the soft built on stilts Establishing of circuit, the gap after utilizing train speed limit to pass through, uses conventional method by place for precast box bridge 4 jacking, is removed by interim fulcrum hole digging pile 3 successively in jack-in process; Prefabricated case beam 4 after in place forms support across overhead wire to it;
7th step, removes and horizontally lifts beam and longeron
Successively with 16-25t crane, 5t hoist engine and movable pulley horizontal beam 7 of lifting is extracted out by root, disintegrated, take out a horizontal beam of lifting and backfill ballast aggregate in time, adjustment line level, be transitioned on frame bridge by being temporarily fixed at the horizontal contact net bar column lifted on beam 7, semaphore moves on to original position; Remove longeron 8 and disintegrate; Maintenance circuit is to recovering train constant speed.
Claims (2)
1. a soft built on stilts reinforcing jacking for undercrossing tunnel turnout group jacking wide-span case bridge construction, is characterized in that: it comprises following construction sequence:
The first step, fulcrum stake is laid
The two main fulcrum hole digging pile (1) of row and secondary fulcrum hole digging piles (2) are laid in the two ends of overhead wire symmetry, the interim fulcrum hole digging pile (3) of two row or multi-row is laid between main fulcrum hole digging pile (1), corresponding to treating that the overhead wire opposite side of jacking prefabricated case beam (4) is provided with anti-back stake (5), offer groove on the top of anti-back stake (5), in groove, be placed with location i iron (6);
Second step, assembledly horizontally lifts beam
Set up assembly jig in the front end of prefabricated case beam and both sides, assembledly on the top of assembly jig and prefabricated case beam horizontally lift beam (7), what be assembled into horizontally lifts the cross section width that beam (7) length meets fixed track usage plan;
3rd step, makes longeron
I iron is connected into longeron (8) by supramarginal plate, inframarginal and web;
4th step, sets up the soft built on stilts system of circuit
Go slowly period at train, by twice one group longeron (8) is seated in successively lay along line direction main fulcrum hole digging pile (1), on secondary fulcrum hole digging pile (2) and interim fulcrum hole digging pile (3); Ballast tub under excavation sleeper, is arranged in through rear spaced horizontal from longeron (8) bottom successively horizontally lifts beam row by horizontal beam (7) of lifting, and to lift on beam at the bottom of with hardwood plate supporting rail or at the bottom of sleeper horizontal; Then longeron (8) and horizontal beam (7) of lifting are connected as a single entity by U bolt, wood are set outside track and between longeron i iron and support fixing, horizontal beam, longeron and the circuit lifted is connected as a single entity; Horizontal beam row left side of lifting corresponding to precast box bridge (4) position extends to precast box bridge (4) front top, and right-hand member extends on the location i iron (6) of anti-back stake (5) upper end, locks onto on the i iron of location by U-shaped hang spring;
5th step; Section of track sliding fulcrum assembly is installed
Two lower sections of track (9) laid by precast box bridge (4) top board, the section of track (10) is fixedly mounted at horizontal interval, the lower section of track (9) corresponding section, position of lifting on beam (7) below and precast box bridge top board, rail contact face between the upper section of track (10) and the lower section of track (9) is shiny surface, and at the track upper surface coating butter of the lower section of track (9);
6th step, the jacking of precast box bridge
After the soft built on stilts Establishing of circuit, the gap after utilizing train speed limit to pass through, uses conventional method by place for precast box bridge (4) jacking, interim fulcrum hole digging pile (3) is removed successively in jack-in process; Prefabricated case beam (4) after in place forms support across overhead wire to it;
7th step, removes and horizontally lifts beam and longeron
Successively horizontal beam (7) of lifting is extracted out by root, disintegrated, and backfill ballast aggregate in time, adjustment line level; Remove longeron (8) and disintegrate.
2. the soft built on stilts reinforcing jacking of undercrossing tunnel turnout group jacking wide-span case bridge construction according to claim 1, it is characterized in that: the horizontal Liang Paishang of lifting between described two longerons (8) is provided with pressure beam (11), and described pressure beam (11) is connected mutually by U bolt and described horizontal beam (7) of lifting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210573745.8A CN102979041B (en) | 2012-12-26 | 2012-12-26 | Soft overhead reinforcing jacking method for construction of span box bridge of jacking block of underpass turnout group of railway |
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| CN201210573745.8A CN102979041B (en) | 2012-12-26 | 2012-12-26 | Soft overhead reinforcing jacking method for construction of span box bridge of jacking block of underpass turnout group of railway |
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| CN102979041A CN102979041A (en) | 2013-03-20 |
| CN102979041B true CN102979041B (en) | 2015-01-21 |
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| CN104099872B (en) * | 2014-06-30 | 2016-08-17 | 中铁四局集团第四工程有限公司 | A kind of undercrossing tunnel large span box culvert is vertical to be chosen and horizontal lifts jacking construction method |
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| CN110965486A (en) * | 2019-12-18 | 2020-04-07 | 中铁七局集团郑州工程有限公司 | Method for constructing frame culvert in existing railway hard overhead |
| CN111576111A (en) * | 2020-05-29 | 2020-08-25 | 中铁六局集团有限公司 | Frame bridge jacking railway turnout reinforcement construction method |
| CN112878216A (en) * | 2020-11-30 | 2021-06-01 | 中国十七冶集团有限公司 | Suspension type railway underpass box culvert jacking track reinforcing method |
| CN113718784B (en) * | 2021-09-29 | 2022-06-10 | 西安建筑科技大学 | High-water-level loess stratum multi-track railway composite overhead system and construction method thereof |
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