CN102926299B - Railway elevating and fixing device and railway bridge and culvert construction method adopting railway elevating and fixing device - Google Patents

Railway elevating and fixing device and railway bridge and culvert construction method adopting railway elevating and fixing device Download PDF

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CN102926299B
CN102926299B CN201210467428.8A CN201210467428A CN102926299B CN 102926299 B CN102926299 B CN 102926299B CN 201210467428 A CN201210467428 A CN 201210467428A CN 102926299 B CN102926299 B CN 102926299B
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stake
longeron
sleeper
horizontal
fulcrum
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CN102926299A (en
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李维平
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房士杰
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Abstract

The invention discloses a railway elevating and fixing device and a railway bridge and culvert construction method adopting the railway elevating and fixing device. The railway elevating and fixing device comprises longitudinal beams and a sleeper beam, the sleeper beam penetrates through a track downwards and is parallel to a concrete sleeper, the top parts at the two ends of the sleeper beam are respectively and fixedly connected with one longitudinal beam perpendicular to the sleeper beam, and a support point pile used for supporting a beam body is fixed under the longitudinal beam. The railway elevating and fixing device and the railway bridge and culvert construction method adopting the railway elevating and fixing device solve the problem that the fixing effect of the traditional railway bridge and culvert construction method can not meet the requirements for the railway speed, and the elevation span can not meet the requirements for large span bridge and culvert passing.

Description

The built on stilts fastening devices of a kind of railway and the method that adopts this device increasing to build railway bridges and culverts
Technical field
The invention belongs to road and bridge engineering field, be specifically related to the built on stilts fastening devices of a kind of railway and adopt this device to increase the method for building railway bridges and culverts.
Background technology
Current national railway network basically forms, and road network grade is more and more higher, along with expanding economy, the fast developments such as urban road, highway, shipping traffic, the phenomenon of highway, across-river railway is very general, and it is also increasing to pass through span, railway grade separation develops into porous big frame by the little bridges and culverts of original single hole.Original D type horizontal beam construction method of lifting of beam construction method and hanger rail of constructing just increases bridge construction at current existing track circuit to contain span increasing, in big frame construction and the current increasing situation of line conditions, many deficiencies are presented, mainly contain following aspect: 1, the D type just beam of constructing is single-beam series, the maximum span 24m that is suitable for, because not being connected to continuous beam, thus limited by span, inapplicable when big frame jacking.2, the D type just sleeper beam spacing of beam of constructing is fixed as 67cm, and the spacing of III type concrete crosstie is 60cm, therefore, and demanding party's pillow and take out pillow while setting a roof beam in place is large to circuit disturbance.3, the construct longeron quality of just beam of D type is large, and span is long, is unfavorable for lifting under the contact net of electric railway, and traffic condition and Road Site condition are all restricted.There is following shortcoming in the horizontal beam method of lifting of hanger rail: 1, the horizontal beam method of lifting of hanger rail does not have fulcrum stake on roadbed, horizontally lifts beam and hanger rail beam does fulcrum by roadbed completely, therefore, excavates roadbed in the situation that there is no reliable guarantee, has potential safety hazard to exist.2, the horizontal horizontal beam stress span of lifting of lifting beam method of hanger rail is large, causes the horizontal beam deflection of lifting large, affects circuit driving, even has potential safety hazard.3, the railway system, because of the needs of transport power, require the minimum Speed limit of 48kmh of construction to be not less than 45 kilometers, and the horizontal beam method of lifting of hanger rail only can meet 35 kilometers/following speed limit per hour, therefore can not adapt to the actual needs of current rail system at present.
Summary of the invention
Increase and build that railway bridges and culverts form of construction work fixed effect can not meet existing railway rate request and built on stilts span is little cannot meet the problems such as large span bridges and culverts passes through in order to solve tradition, the present invention has designed the built on stilts fastening devices of a kind of railway and has adopted this device to increase the method for building railway bridges and culverts.
The technical scheme that the present invention addresses the above problem is: a kind of railway is maked somebody a mere figurehead fastening devices, described device comprises longeron and sleeper beam, under sleeper beam, wear track and be parallel to concrete pillow, top, sleeper beam two ends is fixedly connected with respectively a perpendicular longeron, and longeron below is fixed with the fulcrum stake of brace summer body.Its advantage is: the longeron at sleeper beam two ends is with the form overhead wire of continuous beam, taking distribute fulcrum stake as fulcrum transmit load of roadway, in the time of jacking big frame bridges and culverts, not limited by girder span, as long as according to circuit different situations, fulcrum is rationally set, just can meet the built on stilts fixing needs of big frame circuit, and ensure every safety technics index of circuit to meet railway minimum operation speed 45km/h requirement.Adopt this apparatus structure hardened link, circuit physical dimension can keep train in constant speed standard, and circuit is stable, and vertical transverse beam rigidity is large, safe and reliable, and driving steadily.
The built on stilts fastening devices of described railway, longeron one side is fixed with gear cap stake in parallel, and gear cap stake and the fulcrum stake top corresponding with its position have wears under vertical and the horizontal beam group of lifting of support stringer.Its advantage is: the horizontal beam group of lifting is made up of large-scale i iron, be located at fulcrum stake, gear cap stake and frame bridge top, when frame bridge jacking is during to fulcrum stake fulcrum, lift beam transition through horizontal, frame bridge bears the horizontal load of lifting beam group, by fulcrum stake unloading, and the first row fulcrum stake of removing, other row's fulcrum stake simultaneously ensures that track circuit is stable.Even while removing last row's fulcrum stake, also there is the stake of gear cap as the strong point, ensure the frame bridge reliable fulcrum that often taken a step forward, prevent track circuit distortion displacement, until that frame bridge continues jacking is in place to frame bridge.
The built on stilts fastening devices of described railway, gear cap stake top is stepped gear cap, horizontal one end of lifting beam group withstands on the sidewall of gear cap.Its advantage is: gear cap stake top is stepped gear cap, and gear cap sidewall withstands horizontal one end of lifting beam group, horizontally while preventing frame bridge jacking lifts the orbit displacement that horizontal sliding force that beam group produces track causes.
The built on stilts fastening devices of described railway, the stake of gear cap with horizontal lift beam group by pre-buried rail be fixedly connected with.Its advantage is: prevent horizontal lift beam group while outwards sliding track produce horizontal sliding force and cause to skew.
The built on stilts fastening devices of described railway, longeron by multiple works just beam connect by junction plate equal strength.Its advantage is: longeron can select I115 type work just beam, I100 type work just beam, X38 case beam etc. are fixedly connected with, be just beam of I115 type work by the transformation of the way of H100 type rice steel, and changing material into Q345B bridge steel by original No. three steel does, strengthen the use span of longeron, strengthen the intensity of longeron, reduce the amount of deflection of beam, strengthened the moment of inertia of beam, improved the rigidity of beam.
The built on stilts fastening devices of described railway, junction plate is by web, outer cover plate and inner cover plate composition fixedly cover work just between beam, by bolt by work just beam be connected to one.Its advantage is: just the bonding strength between beam is identical with beam body to ensure work, no effect on longitudinal-beam span and fulcrum stake position.
The built on stilts fastening devices of described railway, track is fixedly connected with by fastener with sleeper beam.Its advantage is: control circuit direction and gauge, every sleeper beam arranges 2 pairs of rail fastenings, controls orbital position constant.
The built on stilts fastening devices of described railway, fastener and track contact position are lined with nylon insulation angle.Its advantage is: avoid the generation of track circuit connection electrification.
Structure of the present invention has been drawn D type beam and the horizontal advantage of lifting beam method of traditional hanger rail, has avoided the deficiency of above-mentioned two kinds of construction methods, single hole just beam become the continuous beam that can extend to greatest extent, shortened the stressed span of longeron simultaneously; The intensive horizontal beam of lifting is become to the horizontal beam group of lifting, reduced the friction point of circuit and framework; Anti-ly move stake and become the fulcrum stake of distribution what concentrate, the framework reliable fulcrum carrying circuit that often taken a step forward, then in conjunction with the measure of control circuit direction and gauge, make circuit remain at steady, firm, safe state.This hardened link structure, circuit physical dimension can make train remain on constant speed standard, and circuit is stable, and vertical transverse beam rigidity is large, safe and reliable, and driving is steadily.
Adopt the built on stilts fastening devices of railway to increase a method of building railway bridges and culverts, it comprises the steps:
1) fulcrum stake and gear cap pile driving construction, in the built on stilts fastening devices of railway longeron yet to be built below, and be parallel to longeron one side for the fixing horizontal beam group position of lifting, determine fulcrum, borehole is also built steel concrete and is formed fulcrum stake and the stake of gear cap.
2) wear sleeper beam, sleeper beam is worn track from concrete pillow is aerial vertical;
3) set up longeron, by work just erection at top, sleeper beam two ends, be fixedly connected into longeron by junction plate;
4) longeron and sleeper beam fixed connection;
5) fastener for installing, is fixed as one track and sleeper beam by fastener;
6) penetrate the horizontal beam group of lifting, horizontal lifting worn to longeron and be fixed on fulcrum stake and gear cap stake top under beam group, complete circuit built on stilts fixing;
7) excavation roadbed, simultaneously frame bridge jacking;
8), in the time that frame bridge front end arrives at first row fulcrum stake limit, frame bridge bears the horizontal load of lifting beam group, by fulcrum stake unloading, and the first row fulcrum stake of removing;
9) continue shoveling jacking, the process of repeating step 8, until frame bridge is in place.
In sum, beneficial effect of the present invention is: 1, owing to being fabricated construction, can rationally arrange according to different engineering characteristics, be applicable to various circuits, framework and geological condition; 2, because sleeper beam spacing is adjustable, little to perturbing of railway roadbed when overhead wire, do not destroy existing line physical dimension, security performance is good; 3, simple in structure, set up and spell prescription just; 4, automobile, trailer all can transport, and get the raw materials ready conveniently, and hoisting transportation cost is low; 5, the railway that is not only applicable to railway main track, station track is maked somebody a mere figurehead, and the railway that is also applicable to bottle-neck section siding is simultaneously built on stilts.
Brief description of the drawings
Fig. 1 is cross section of the present invention and jacking schematic diagram;
Fig. 2 is track strengthening floor map of the present invention;
Fig. 3 is the built on stilts vertical section of circuit of the present invention schematic diagram;
Fig. 4 is just girder construction front view of work of the present invention;
Fig. 5 is just girder construction top view of work of the present invention;
Fig. 6 is just girder construction sectional view of work of the present invention;
Fig. 7 be work of the present invention just beam connect into longeron schematic diagram;
In figure, 1, longeron; 2, sleeper beam; 3, concrete pillow; 4, fulcrum stake; 5, gear cap stake; 6, the horizontal beam group of lifting; 7, track; 8, pre-buried rail; 9, frame bridge; 10, just beam of work; 11, outer cover plate; 12, inner cover plate; 13, web.
Detailed description of the invention
Below in conjunction with accompanying drawing, structure of the present invention is explained in detail to explanation, detailed description of the invention is that a kind of railway is maked somebody a mere figurehead fastening devices, if Fig. 2 is track strengthening floor map of the present invention, comprise longeron 1 and sleeper beam 2, longeron by multiple works just beam 10 connect by junction plate equal strength.If just Fig. 4-6 are work girder construction schematic diagram of the present invention; Junction plate is by web 13, and outer cover plate 11 and inner cover plate 12 form, just fixedly cover between work beam, as Fig. 7 be work of the present invention just beam connect into longeron schematic diagram, by bolt by work just beam be connected to one.Under sleeper beam, wear track 7 and be parallel to concrete pillow 3, top, sleeper beam two ends is fixedly connected with respectively a perpendicular longeron, and longeron below is fixed with the fulcrum stake 4 of brace summer body.Longeron one side is fixed with gear cap stake 5 in parallel, if Fig. 1 is cross section of the present invention and jacking schematic diagram.Gear cap stake and the fulcrum stake top corresponding with its position have wears under vertical and the horizontal beam group 6 of lifting of support stringer.Described gear cap stake, top is stepped gear cap, horizontal one end of lifting beam group withstands on the sidewall of gear cap.Gear cap stake with horizontal lift beam group by pre-buried rail 8 be fixedly connected with.Track is fixedly connected with by fastener with sleeper beam.Fastener and track contact position are lined with nylon insulation angle.
Adopt the built on stilts fastening devices of railway to increase the method for building railway bridges and culverts, comprise the steps:
1) fulcrum stake and gear cap pile driving construction; The scope of determining hardened link is to determine according to the flange of rail to the height of framework bottom and the gradient of stable side slope.If Fig. 2 is track strengthening floor map of the present invention, in the built on stilts fastening devices of railway longeron yet to be built below, and be parallel to longeron one side for the fixing horizontal beam group position of lifting, fulcrum quantity is by calculating, combined circuit actual conditions determines position of the fulcrum, and borehole is also built steel concrete formation fulcrum stake and the stake of gear cap.Parallel or staggered in the situation that at many track circuits, can determine according to the distance between track circuit the quantity of fulcrum stake, longeron fulcrum adopts fulcrum stake, the plane layout of fulcrum stake will be according to the width of frame bridge and the length of circuit of needing reinforcement, the span of comprehensive longeron and horizontally lift the stressing conditions of beam group and determine.The stake footpath of fulcrum stake and length will be determined according to the height of geological condition and framework.
Determine the scope of hardened link, framework is wide+both sides stable side slope length, and stable side slope length=framework is high × slope ratio.Stable side slope is determined according to geologic information, when bearing capacity of foundation soil is in the time that 120Kpa is above, set by 1:1, bearing capacity of foundation soil below 120Kpa, 80Kpa is when above, by 1:1.5 setting, bearing capacity of foundation soil below 80Kpa time, is set by 1:2.Pilespacing is adjusted between 6.5m-9.5m, and principle is to consider horizontal ability to bear of lifting beam, also will consider economic factor, to guarantee that safety is as main.Stake footpath is generally not less than 120cm, when stake exposure height is in the time that 12m is above, calculate and determine through inspection.Stake is long, and ordinary circumstance is not less than 3 meters with framework bottom to the stake end, in the time that substrate soil property bearing capacity is poor, calculates and determine through inspection.Stake top mark is high,, has and horizontally lifts pushing up from horizontal of beam and lift 20cm under beam from the following 55cm of the flange of rail without horizontal stake top of lifting beam group.Pile wall can be used cast-in-situ steel reinforced concrete retaining wall, also can use concrete reinforced pipe open caisson; Pile body adopts the above concreting of C20 level.In the built on stilts fastening devices of railway longeron yet to be built below, and be parallel to longeron one side for the fixing horizontal beam group position of lifting, by the good fulcrum of calculative determination, borehole is also built steel concrete and is formed fulcrum stake and the stake of gear cap.
2) wear sleeper beam; Adopt standard sleeper beam to wear track from concrete pillow is aerial vertical, circuit limiting operation, utilize train travel gap, penetrate sleeper beam by wearing one principle every six, wear one of a tamping, while penetrating sleeper beam, wherein have under a track and need to be encased inside insulation rubber cushion, prevent track circuit short circuit, affect signal and driving.If Fig. 3 is the built on stilts vertical section of circuit of the present invention schematic diagram, the long 4940mm of sleeper beam, every concrete sky is worn one, adopts Φ 22 high-strength bolts to connect mutually with longeron, in order to stop the generation of track circuit connection electrification, at sleeper beam and rail contact position, the neoprene insulation rubber cushion that 20mm is thick is set.
3) set up longeron; Longeron is installed, track blockade, electrified circuit has a power failure; Lifting longeron is in place, and every a slice longeron in place, at least first connects two sleeper beams, the stable rear longeron junction plate of installing, and the rubber cushion that insulate on track underlay, connects all sleeper beams, first-class fastener.By work just erection at top, sleeper beam two ends, be fixedly connected into longeron by junction plate.Work just beam has plurality of specifications model: I115 type work is just beam, X38 case beam etc. of beam, I100 type work just, according to different line conditions, require to select according to track clearance, and when distance between centers of tracks is subject in limited time, available X38 molding box beam; Work just waits strong connection between beam.The setting of longeron length will be according to works construct span and engineering geology situation, to meet the prerequisite that stabilizes to of side slope.Work just beam adopts 8,12,16 meters of different lengths, taking 12 meters long as main assembled, can be 36 meters, 48 meters, 60 meters etc.As Fig. 7 be work of the present invention just beam connect into longeron schematic diagram, just longeron adopt material be Q345B bridge steel I115 type work beam form.Deck-molding 1150mm, deck-siding 380mm, longeron is to adopt equal strength connection method to be linked to be large span longeron on 12 meters of small-sized just beams of fixing modulus, the work just junction plate between beam is made up of 2 blocks of webs, 2 upper and lower outer cover plates and 4 upper and lower inner cover plate.Adopt material 40B, Φ 22 high-strength bolts connect mutually with longeron, and bolt hole is Φ 24.
4) longeron and sleeper beam connect; Be fixedly connected with sleeper beam and longeron with high-strength bolt; Load of roadway is delivered to longeron by standard sleeper beam, and sleeper beam two ends connect with high-strength bolt with two of left and right longeron lower wing plate respectively; Connect and adopt Φ 22 bolts, material 40B, bolt hole is Φ 24.
5) fastener for installing; By fastener, track and sleeper beam are fixed as one, control circuit direction, nylon insulation angle on fastener and rail contact position pad.
6) penetrate the horizontal beam group of lifting; Horizontal lifting worn to longeron and be fixed on fulcrum stake and gear cap stake top under beam group, complete circuit built on stilts fixing, the horizontal beam group of lifting is made up of large-scale i iron, is located at fulcrum stake top and framework top, and the horizontal beam group of lifting is fixedly connected with by pre-buried rail with crown fulcrum stake.The horizontal beam of lifting is according to fulcrum span, line conditions, and through mechanics, inspection is calculated and definite shaped steel and quantity and length that adopts different model.The horizontal Liang Zushi that lifts is installed, and circuit all just after beam control, utilizes headway time interval that horizontal railway roadbed and the roadbed of lifting beam group position dug through by work, while having train to pass through, sets up interim fulcrum in advance with short sleeper, and supporting track, guarantees that train smooth passes through; When frame bridge jacking is to approaching horizontal lifting behind beam group termination, start to penetrate the horizontal beam group of lifting, and on stake top place pad, be not less than the rubber cushion of 20cm.
7) excavation roadbed, simultaneously frame bridge 9 jackings, if Fig. 1 is that cross section of the present invention and jacking schematic diagram and Fig. 3 are the built on stilts vertical section of circuit of the present invention schematic diagram.
8) in the time that frame bridge front end arrives at first row fulcrum stake limit, frame bridge bears the horizontal load of lifting beam group, and all horizontal beams of lifting all ride on framework, coaster is set under beam or rolls bar horizontal lifting, then fulcrum stake upper padding plate is removed, by fulcrum stake unloading, and the first row fulcrum stake of removing.
9) continue shoveling jacking, when frame bridge front end arrives at second row fulcrum stake limit, repeating step 8) process, until frame bridge is in place.
Technique scheme has only embodied the optimal technical scheme of technical solution of the present invention, and those skilled in the art have all embodied the principle of invention to some variations that wherein some part may be made, within belonging to protection scope of the present invention.

Claims (5)

1. the built on stilts fastening devices of railway, the built on stilts fastening devices of described railway comprises many longerons (1) and many sleeper beams (2), under described sleeper beam (2), wear track (7) and be parallel to concrete pillow (3), it is characterized in that, every sleeper beam (2) top, two ends is fixedly connected with respectively a perpendicular described longeron (1), and every longeron (2) below is fixed with the many fulcrum stakes (4) of supporting its beam body; One side of described longeron (2) is fixed with many gear cap stakes in parallel (5), and described gear cap stake (5) and fulcrum stake (4) top corresponding with its position have the horizontal beam group (6) of lifting of wearing and support simultaneously described many longerons (2) under vertical; The top of described gear cap stake (5) is stepped gear cap, and described horizontal one end of lifting beam group (6) withstands on the sidewall of this gear cap; Described gear cap stake (5) is fixedly connected with by the pre-buried rail (8) being embedded in this gear cap stake (5) with the corresponding horizontal beam group (6) of lifting; Described longeron (2) is just connected by junction plate equal strength between beam (10) by multiple works; Described junction plate is made up of 2 blocks of webs (13), 2 upper and lower outer cover plates (11) and 4 upper and lower inner cover plate (12), described junction plate fixedly covers work just between beam, and by bolt by multiple works just beam (10) be connected to one and form described longeron (1); Described track (7) is fixedly connected with by fastener with described sleeper beam (2); Described fastener and described track (7) contact position are lined with nylon insulation angle.
2. adopt the built on stilts fastening devices of claim 1 railway to increase a method of building railway bridges and culverts, it is characterized in that, it comprises the steps:
1) fulcrum stake and gear cap pile driving construction:
First, in the built on stilts fastening devices of railway longeron yet to be built below, and be parallel to longeron one side for the fixing horizontal beam group position of lifting, according to the fulcrum quantity of calculating, combined circuit actual conditions determines position of the fulcrum, and borehole is also built steel concrete formation fulcrum stake and the stake of gear cap; Then, determine the scope of hardened link, for framework wide+both sides stable side slope length, stable side slope length=framework is high × slope ratio, when bearing capacity of foundation soil is in the time that 120Kpa is above, set stable side slope by 1:1, bearing capacity of foundation soil below 120Kpa, 80Kpa is when above, press 1:1.5 and set stable side slope, bearing capacity of foundation soil is below 80Kpa time, by 1:2 setting stable side slope; Wherein, pilespacing is adjusted between 6.5m-9.5m, and stake footpath is not less than 120cm, and stake is long is an extremely stake end of framework bottom, is not less than 3 meters, and pile wall is with cast-in-situ steel reinforced concrete retaining wall or use concrete reinforced pipe open caisson; Pile body adopts the above concreting of C20 level;
2) wear sleeper beam:
Adopt standard sleeper beam to wear track from concrete pillow is aerial vertical, penetrate sleeper beam by wearing one principle every six, wear one of a tamping, while penetrating sleeper beam, wherein have under a track and need to be encased inside insulation rubber cushion, every concrete sky is worn one, adopts high-strength bolt to connect mutually with longeron, at sleeper beam and rail contact position, neoprene insulation rubber cushion is set;
3) set up longeron:
Lifting longeron is in place, and every a slice longeron in place, at least first connects two sleeper beams, longeron junction plate is installed after stable, and the rubber cushion that insulate on track underlay, connects all sleeper beams, first-class fastener, by work just erection at top, sleeper beam two ends, be fixedly connected into longeron by junction plate; The work just junction plate between beam is made up of 2 blocks of webs, 2 upper and lower outer cover plates and 4 upper and lower inner cover plate, adopts high-strength bolt to connect mutually with longeron;
4) longeron and sleeper beam fixed connection:
Be fixedly connected with sleeper beam and longeron with high-strength bolt, sleeper beam two ends connect with high-strength bolt with two of left and right longeron lower wing plate respectively;
5) fastener for installing:
By fastener, track and sleeper beam are fixed as one, control circuit direction, nylon insulation angle on fastener and rail contact position pad;
6) penetrate the horizontal beam group of lifting:
Horizontal lifting worn to longeron and be fixed on fulcrum stake and gear cap stake top under beam group, complete circuit built on stilts fixing, the horizontal beam group of lifting is made up of large-scale i iron, is located at fulcrum stake top and framework top, and the horizontal beam group of lifting is fixedly connected with by pre-buried rail with fulcrum stake; The horizontal Liang Zushi that lifts is installed, and circuit all just after beam control, utilizes headway time interval that horizontal railway roadbed and the roadbed of lifting beam group position dug through by work; When frame bridge jacking is to approaching horizontal lifting behind beam group termination, start to penetrate the horizontal beam group of lifting, and on stake top place pad rubber cushion;
7) excavation roadbed, simultaneously frame bridge (9) jacking;
8) in the time that frame bridge front end arrives at first row fulcrum stake limit, frame bridge bears the horizontal load of lifting beam group, and all horizontal beams of lifting all ride on framework, coaster is set under beam or rolls bar horizontal lifting, then fulcrum stake upper padding plate is removed, by fulcrum stake unloading, and remove the stake of first row fulcrum;
9) continue shoveling jacking, repeating step 8) process, until frame bridge is in place.
3. the method for railway bridges and culverts is built in increasing according to claim 2, it is characterized in that: in step 1), parallel or staggered in the situation that at many track circuits, determine the quantity of fulcrum stake according to the distance between track circuit, longeron fulcrum adopts fulcrum stake, the plane layout of fulcrum stake will be according to the width of frame bridge and the length of circuit of needing reinforcement, the span of comprehensive longeron and horizontally lift the stressing conditions of beam group and determine, and the stake footpath of fulcrum stake and length are definite according to the height of geological condition and framework.
4. the method for building railway bridges and culverts according to the increasing described in claim 2 or 3, is characterized in that: in step 1), when stake exposure height is in the time that 12m is above, calculate and determine through inspection, in the time that substrate soil property bearing capacity is poor, calculates and determine that stake is long through inspection; Stake top mark is high,, has and horizontally lifts pushing up from horizontal of beam group and lift 20cm under beam from the following 55cm of the flange of rail without horizontal stake top of lifting beam group.
5. the method for railway bridges and culverts is built in increasing according to claim 4, it is characterized in that: in step 3), work just waits strong connection between beam; Arranging according to works construction span and engineering geology situation of longeron length, to meet the prerequisite that stabilizes to of side slope, it is the just beam formation of I115 type work of Q345B bridge steel that longeron adopts material, and longeron will be fixed 12 meters of small-sized just beams of modulus and adopt equal strength connection methods to be linked to be large span longeron.
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