CN107988921B - Single-point continuous pushing construction method for overpass bridge over railway and highway - Google Patents
Single-point continuous pushing construction method for overpass bridge over railway and highway Download PDFInfo
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- CN107988921B CN107988921B CN201711034197.0A CN201711034197A CN107988921B CN 107988921 B CN107988921 B CN 107988921B CN 201711034197 A CN201711034197 A CN 201711034197A CN 107988921 B CN107988921 B CN 107988921B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention discloses a single-point continuous pushing construction method for a cross-line bridge of an upper cross-over railway and an expressway. The jacking operation of a section of beam body is continuously carried out through the continuous work of the jack, so that the jacking speed of the beam body is increased; the construction method is formed by improving, innovating and optimizing the actual situation of the overpass bridge of the overpass railway and the expressway on the basis of mature incremental launching construction technology at home and abroad; the pushing device is particularly suitable for the overpass bridge constructed in the railway skylight time period required to be notified by the supervision personnel in the railway department, the pushing device is high in automation degree and high in construction progress, the beam body is high in speed in the pushing process, stable in operation, safe and reliable, and the influence on the existing line is small.
Description
Technical field
The present invention relates to single-point successively incremeantal launching method construction fields, in particular to a kind of to be directed to overcrossing railway, highway
Cross-line bridge the actual conditions construction method that improves, innovate, optimize and formed.
Background technique
As China's highway, railway constantly develop, occur overcrossing railway, highway cross-line bridge increasingly
It is more, because cross-line bridge is influenced by factors such as construction time, construction site, clear height limitations, bridge rotating or the prefabricated installation of beam slab
A large amount of measure costs need to be put into, lead to long construction period, it is at high cost, security risk is big the defects of, be not able to satisfy specific environment and apply
Work needs.
Summary of the invention
The shadow that it is an object of the invention to solve to be limited etc. factors by construction time, construction site, clear height because of cross-line bridge
It rings, bridge rotating or the prefabricated installation of beam slab need to put into a large amount of measure costs, lead to long construction period, at high cost, security risk is big
The defects of, it is not able to satisfy the problem of specific environment construction needs；There is provided herein it is a kind of for overcrossing railway, highway across
Line bridge uses single-point successively incremeantal launching method construction method, makes full use of the construction time to reach, safe and reliable completion construction task.
The invention is realized in this way constructing a kind of overcrossing railway, the cross-line bridge single-point successively incremeantal launching method of highway is applied
Work method: it is realized and is connected using successively incremeantal launching method jack, steel wire bundle, automated tool anchor, fashioned iron reaction frame and preceding anchored end system
Continuous pushing tow；
It passes through the continuous work of successively incremeantal launching method jack, is carried out continuously the pushing tow operation of one section of beam body, to improve beam
The pushing tow speed of body, it is characterised in that: the following steps are included:
(1), unit in charge of construction marches into the arena, three supplies and one leveling；Impacted railway setting is transformed；Clear table is excavated to design
Excavation line；Smooth precasting yard place；
(2), construction abutment to platform cap, construction pile foundation of bridge pier, pier stud, bent cap；Pier of constructing is rigidly connected；Constructing prefabricated beam
Field, pedestal slideway；Chute system is formed by beam making bench slideway and each pier slideway, chute system is to realize the smooth pushing tow of box beam
Key, beam making bench slideway includes chute board, sliding block and cover board, and pier slideway includes slideway block, chute board and sliding block；Beam processed
Pedestal slideway uses continuous slideway, completely spreads chute board, sliding block, cover board on the continuous slideway wall of beam making bench；Chute board is Q235
Steel plate is made up of the stainless steel plate of dormant bolt outsourcing 2mm thickness, slideway board ends be all provided with transition slope section with non-slipping block it is mobile by
Resistance；Sliding block uses interlayer of steel plate hot pressing rubber and polyfluortetraethylene plate to suppress in factory with special process；Cover board is by 5mm thickness
Upper cover plate, 10mm thickness the Q235 steel plate of two kinds of specifications of lower cover plate be welded, as a part of bed die, to prevent box beam
Spillage when casting concrete, cover board upper and lower plates front-back staggered 10mm are connected in the form of mother-son mouth with bed die junction mismatch 10mm
It connects；Pier slideway is the important fulcrum slideway that box beam is advanced along pushing tow direction, is placed in pier using the structure of fashioned iron and steel plate composition
On platform；Pier slideway sliding block is identical as sliding block used in beam making bench；
(3), formwork supporting plate, assembling reinforcement pour box beam, stretch-draw prestressing force steel beam；One-piece casting completes whole cast-in-situ box girders；
And guardrail construction is completed in box beam two sides, central drainage facility is installed；The steel member of factory's definite value steel nose girder；
(4), the assembled steel nose girder on beam making bench；Slideway, pushing tow facility, guiding device are installed in pier top surface；Wear drawing
Hauling rope adjusts pulling equipment, and carries out test pushing tow to beam body, verifies pushing tow system effectiveness；
Wherein, pushing tow system includes successively incremeantal launching method jack, rear anchor beam, counterforce device and traction steel strand wires；Successively incremeantal launching method
Jack is the power device of pushing tow system, and according to the calculating to practical jacking force, it is very heavy that automatic continuous jacking is set on abutment
Top, successively incremeantal launching method jack front and back top is equipped with automated tool anchor and travel switch, and is furnished with the automatic continuous jacking of double oil circuits
Oil pump；To guarantee that successively incremeantal launching method axis is consistent with rear anchor beam anchor circle center and fixing successively incremeantal launching method jack, if even
Continuous pushing tow jack horizontal tray, successively incremeantal launching method jack are placed on horizontal tray；Horizontal tray by fashioned iron and steel plate welding and
At, by steel plate and pre-buried fining twisted steel welding be anchored on abutment platform cap；
(5), the sundries on steel nose girder, the sundries of removing case top surface of the beam are removed；Progress box beam incremental launching construction stage by stage, first
Stage, speed control was in 35~38cm/min, calculating speed 22m/h without Midspan sag, highway incremental launching construction；To box beam beam
Body is monitored, and prevents deviation, deformation, beam body creeping phenomenon during pushing tow；
Cloth postpones anchor beam on continuous box girder tail end face: rear anchor beam is main load transfer device, and rear anchor beam is by I-steel
Bearing beam, rear anchor girder and I-steel anchoring beam composition；
In the I-shaped real abdomen plate girder of variable cross-section that box beam vertical shift front end corresponds to web position setting；Exist as continuous box girder
Main force structure during pushing tow, steel nose girder serve during pushing tow it is very crucial, it must have it is enough just
Degree and bonding strength；Steel nose girder is customized using factory, on-site consolidation mode；Using Q345D steel；
(6), second stage box beam carries out Midspan sag, highway incremental launching construction, and speed control is calculated in 35~38cm/min
Speed 22m/h, is monitored box girder body, prevents deviation, deformation, beam body creeping phenomenon during pushing tow；Complete this stage
Gib is carried out to beam body and steel nose girder afterwards；
One observation station is set at abutment end, observes box beam and steel nose girder axis deviation and amount of deflection；At precast beam field abutment end
One observation station is set, beam making bench settling amount is observed；One observation station is set again in Abutment, during observation pushing tow and the quiet stopping time
Box beam deflection, pier settling amount and horizontal displacement；
Deviation-rectifying system is formed by deviation-rectifying bracket and correction voussoir, deviation-rectifying bracket is welded by fashioned iron and steel plate, by setting
It sets pre-embedded steel slab and fashioned iron reaction frame in bent cap side to weld, correction voussoir is made of two pieces of gad blocks；Since pier is all provided with
It is equipped with deviation-rectifying bracket, box beam can be controlled and " shaken the head " during pushing tow, to solve box beam " wagging the tail ", box beam is provided with and limits
Device, limiter and box beam contact position use bearing, can rotate to limit box beam offset with box beam movement, and meet pushing tow
Construction precision requirement；Limiter is fixed on beam making bench side by fining twisted steel；
(7), phase III box beam pushing tow dropping place, by beam body pushing tow dropping place to Abutment, speed control is in 35~38cm/
Min, calculating speed 22m/h；Box beam is fixed temporarily, prevents box beam from returning rebound backward because removing pulling equipment；It removes pre-
Beam making field, platform rear slide；
(8), steel nose girder is removed, beam-ends is smoothed out with concrete；Tensioning later period beam and the earlier beam of relaxation part；Traction is removed to set
It is standby, remove fashioned iron reaction frame；Permanent support is installed on bearing pad stone；Successively incremeantal launching method jack is set on pier,
Beam body is jacked up；Slideway and slideway cushion block is removed to be moved to steel pipe after slideway cushion block is removed with 5T chain coaster and take
If full hall formula workbench on, under the beam body edge of a wing, then with crane be hoisted to ground；
The full corresponding bracket frame pipe of hall formula workbench uses 48 × 3.5mm of φ fastener type steel pipe, lateral, longitudinal, vertical
It is set up with 90cm spacing, sets up first row transverse and longitudinal frame pipe from original ground 70cm height；The side in full hall formula workbench
The upper descending stair step of designer into bracket, except every uplink 1.8m high setting one in addition to 2.5m eminence is arranged in first order interval platform
Locate interval platform；It is closed with safety guard net full framing periphery；Before full hall formula workbench is set up, first to ground base
Artificial levelling compacting is carried out, and in the C30 concrete pad of every steel pipe bottom placement 20 × 20 × 10cm of；
(9), beam is fallen, simultaneously operating jack falls beam body steadily on beam to permanent support；Remove pier rigid connection；
Complete the construction of abutment hearing wall, bridge pier block；It bankets after construction platform, attachment strap；
(10), completion is secondary mats formation；Set up anti-throwing net, monitoring power grid；Complete central drainage facility；At bridge operation；
When box beam pushing tow, construction personnel station completes progress sliding block on the platform of bridge pier longitudinal direction two sides and is fed into, takes out, carries
Work；Beam body pushing tow in place after, Luo Liangqian, You Luoliang jack jack up girder about 3cm make beam body leave slideway, are cut with gas cutting
It is pulled on slideway to workbench except slideway and bent cap embedded board interconnecting piece, then with 5T chain coaster, it is minimum net under the beam body edge of a wing
Empty 2.69m, finally on crane handling slideway to ground.
It is public for overcrossing railway, high speed the invention discloses on the basis of a kind of mature Incremental Launching Construction Technology at home and abroad
The construction method that the actual conditions of the cross-line bridge on road improve, innovate, optimize and formed.Railway department is particularly adapted to want
The cross-line bridge constructed in the railway Window time section for asking supervisor to notify, incremental launching device high degree of automation, construction
Progress is fast, and speed is fast during pushing tow for beam body, runs smoothly, securely and reliably, small on both wired influences.The present invention uses single-point
Successively incremeantal launching method technology rationally designs, easy construction, has saved cost relative to the prefabricated installation of bridge rotating or beam slab, has shortened
Duration.
The cross-line bridge single-point successively incremeantal launching method construction method of overcrossing railway, highway, it is characterized in that the following steps are included:
Precasting yard is set along roadbed after the abutment of bridge y direction, continuous slideway is set on the beam making bench of precasting yard, is laid with sliding block,
Installation box girder formwork reinforcing bar and prestress pipe, pours box beam concrete, after concrete strength reaches design tensioning intensity, into
The tensioning of row prestressing tendon and hole path pressure grouting finally carry out sealing off and covering anchorage.After box beam makes, i.e., in box beam front end assembly steel nose girder,
It is exerted a force by level jack, by slideway, sliding block, using series connection punching continuous jack, steel wire bundle, automated tool
Anchor, rear reaction frame and preceding anchored end system realize successively incremeantal launching method by beam body pushing tow forward paragraph by paragraph, beam is fallen after in place, replaces formal branch
Seat.
The present invention has the advantage that compared with prior art, the beneficial effects of the present invention are:
(1) incremental launching device high degree of automation, construction speed is fast, and speed is fast during pushing tow for beam body, runs smoothly, pacifies
It is complete reliable, small on both wired influences.
(2) more (identical project scale about saves 50% investment) is saved than construction by swing investment.
(3) prefabrication of beam of the present invention, pushing tow are within the scope of the construction red line of roadbed and bridge, not additional land occupation,
And the engineerings such as bridge deck such as anticollision barrier are constructed together when prefabrication of beam and are finished, avoid rubbish of constructing during incremental launching construction
Rubbish, sundries, which fall, invades both wired situation, and energy conservation and environmental benefit are very significant.
Detailed description of the invention
Fig. 1 pushing tow system facade arrangement schematic diagram；
Fig. 2 pushing tow System planes arrangement schematic diagram；
Fig. 3 jack reaction frame and bracket arrangement figure；
Fig. 4 automatic continuous jacking system Mating graph；
Fig. 5 pushing tow jack counterforce device figure；
Anchor beam structural map after Fig. 6；
Fig. 7 a-7b steel nose girder schematic diagram；
Fig. 8 a beam making bench slideway；
Fig. 8 b is I-I schematic diagram in Fig. 8 a；
Fig. 9 a-9b pier chute system；
Figure 10 correction reaction frame pier top layout drawing；
Figure 11 a-11c correction voussoir schematic diagram；
Figure 12 a-12b box beam limiter；
Figure 13 a rigid connecting systems arrange elevation；
Figure 13 b rigid connecting systems plane of arrangement figure.
Wherein: 1 precast beam field+pedestal slideway, 2 slideway cushion blocks, 3 punching jack, 4 nose girders, 5 traction steel strand wires, 6 tops
Slideway, 7 pier top slideways.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in detail, and technical solution in the embodiment of the present invention carries out clear
Chu is fully described by, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
The present invention provides the cross-line bridge single-point successively incremeantal launching method construction of a kind of overcrossing railway, highway by improving herein
Method；The invention is realized in this way using series connection punching continuous jack, steel wire bundle, automated tool anchor, rear reaction frame
And preceding anchored end system realizes successively incremeantal launching method.It by the continuous work of jack, make the pushing tow operation of one section of beam body continuously into
Row, to improve the pushing tow speed of beam body, the interruption jacking phenomenon of beam body when avoiding pace type pushing tow, with meet especially on across
A kind of construction method that the incremental launching construction of railway having time limitation requires, comprising the following steps:
(1) unit in charge of construction marches into the arena, three supplies and one leveling；Impacted railway setting is transformed；Clear table is excavated to design and digs
Square line；Smooth precasting yard place.
(2) construction abutment to platform cap, construction pile foundation of bridge pier, pier stud, bent cap；Pier of constructing is rigidly connected；Constructing prefabricated beam
Field, pedestal slideway.
(3) formwork supporting plate, assembling reinforcement pour box beam, stretch-draw prestressing force steel beam；One-piece casting completes whole cast-in-situ box girders.
And guardrail construction is completed in box beam two sides, central drainage facility is installed；The steel member of factory's definite value steel nose girder.
(4) the assembled steel nose girder on beam making bench；Slideway, pushing tow facility, guiding device etc. are installed in pier top surface；Wear drawing
Hauling rope adjusts pulling equipment, and carries out test pushing tow to beam body, verifies pushing tow system effectiveness.
(5) sundries on steel nose girder, the sundries of removing case top surface of the beam are removed；Progress box beam incremental launching construction stage by stage, first
Stage, speed control was in 35~38cm/min, calculating speed 22m/h without Midspan sag, highway incremental launching construction；To box beam beam
Phenomena such as body is monitored, and prevents deviation during pushing tow, deformation, beam body from creeping.
(6) second stage box beam carries out Midspan sag, highway incremental launching construction, and speed control is calculated in 35~38cm/min
Phenomena such as speed 22m/h, is monitored box girder body, prevents deviation during pushing tow, deformation, beam body from creeping；Complete this rank
Gib is carried out to beam body and nose girder after section.
(7) phase III box beam pushing tow dropping place, by beam body pushing tow dropping place to Abutment, speed control is in 35~38cm/
Min, calculating speed 22m/h；Box beam is fixed temporarily, prevents box beam from returning rebound backward because removing pulling equipment；It removes pre-
Beam making field, platform rear slide etc..
(8) steel nose girder is removed, beam-ends is smoothed out with concrete；Tensioning later period beam and the earlier beam of relaxation part；Traction is removed to set
It is standby, remove reaction frame；Permanent support is installed on bearing pad stone；Jack is set on pier, beam body is jacked up；Remove slideway
And slideway cushion block is moved to (beam body on the full hall formula workbench that steel pipe is set up with 5T chain coaster after slideway cushion block is removed
Under the edge of a wing), then ground is hoisted to crane.
(9) beam is fallen, simultaneously operating jack falls beam body steadily on beam to permanent support；Remove pier rigid connection；It is complete
At the construction of abutment hearing wall, bridge pier block etc.；It bankets after construction platform, attachment strap etc..
(10) completion is secondary mats formation；Set up anti-throwing net, monitoring power grid etc.；Complete central drainage facility；At bridge operation.
The present invention is described in detail with reference to the accompanying drawing:
(1) pushing tow system: pushing tow system includes pushing tow jack, rear anchor beam, counterforce device and traction steel strand wires.
(2) successively incremeantal launching method jack: successively incremeantal launching method jack is the power device of pushing tow system, according to practical pushing tow
The calculating of power sets successively incremeantal launching method jack on abutment, and top is equipped with automated tool anchor and stroke before and after successively incremeantal launching method jack
Switch, and it is furnished with the automatic continuous jacking oil pump of double oil circuits.For guarantee axis it is consistent with rear anchor beam anchor circle center and
Fixed successively incremeantal launching method jack, if successively incremeantal launching method jack horizontal tray, jack are placed on horizontal tray；Horizontal tray is by type
Steel and steel plate are welded, and are anchored on abutment platform cap by steel plate and the welding of pre-buried fining twisted steel.
Pushing tow box beam Midspan sag, highway divide three phases to carry out: the first stage is that examination pushes away the stage, without Midspan sag
Incremental launching construction；Second stage is Midspan sag, highway pushing tow stage；Phase III is pushing tow dropping place rank after Midspan sag, highway
Section, by beam body pushing tow dropping place Abutment.
(3) anchor beam afterwards: rear anchor beam is main load transfer device, and rear anchor beam is by I-steel bearing beam, rear anchor girder and I-steel
Beam composition is anchored, and is arranged on continuous box girder tail end face by design requirement.Anchor beam construction is as shown in Figure 6 afterwards.
(4) draw steel strand wires: traction steel strand wires are the dresses that the pushing tow power that pushing tow jack provides is passed to rear anchor beam
It sets, using 15.2 steel strand wires of φ, steel strand wires direction across bridge should be arranged symmetrically.
(5) steel nose girder: steel nose girder is the hogging moment in order to reduce continuous box girder cantilever position during pushing tow, vertical in box beam
Move the I-shaped real abdomen plate girder of variable cross-section that front end corresponds to web position setting.It is main during pushing tow as continuous box girder
Force structure, steel nose girder serve very crucial during pushing tow, it must have enough rigidity and bonding strength.Steel is led
Beam is customized using factory, on-site consolidation mode.Using Q345D steel, quality of materials should meet " structural carbon steel " (GB700-
2006) related request standardized with " low-alloy high-tensile structural steel " (GB/T1591-2008).
(6) chute system: chute system is the key that realize the smooth pushing tow of box beam, sliding by beam making bench slideway and each pier
Road composition.Beam making bench slideway includes chute board, sliding block and cover board, and pier slideway includes slideway block, chute board and sliding block.Beam processed
Pedestal slideway uses continuous slideway, completely spreads chute board, sliding block, cover board on the continuous slideway wall of beam making bench.Beam making bench slideway
As shown in Figure 8.
Chute board is Q235 steel plate, is made up of the stainless steel plate of dormant bolt outsourcing 2mm thickness, slideway board ends were all provided with
Slope section is crossed to be obstructed with non-slipping block movement.Sliding block uses interlayer of steel plate hot pressing rubber and polyfluortetraethylene plate in factory with special process
It suppresses.Cover board is by 5mm(upper cover plate), 10mm(lower cover plate) the Q235 steel plates of two kinds of specifications is welded, as bed die
A part, spillage when to prevent box girder webs concrete, cover board upper and lower plates front-back staggered 10mm, with bed die junction mismatch
10mm is connected in the form of mother-son mouth.
Pier slideway is the important fulcrum slideway that box beam is advanced along pushing tow direction, is set using the structure that fashioned iron is formed with steel plate
In on pier.Pier slideway sliding block is identical as sliding block used in beam making bench.Pier slideway is as shown in Figure 9.
(7) measuring system: one observation station is set at abutment end, observes box beam and steel nose girder axis deviation and amount of deflection；Pre-
An observation station is arranged in beam making field abutment end, observes beam making bench settling amount；One observation station is set in Abutment again, observes pushing tow mistake
In journey and the box beam deflection in quiet stopping time, the settling amount of pier and horizontal displacement.
(8) deviation-rectifying system: deviation-rectifying system is made of deviation-rectifying bracket and correction voussoir.Deviation-rectifying bracket is welded by fashioned iron and steel plate
It forms, is welded by pre-embedded steel slab and fashioned iron reaction frame that bent cap side is arranged in, correction voussoir is made of two pieces of gad blocks.It entangles
As shown in Figure 10, correction voussoir is as shown in figure 11 for inclined reaction frame pier top arrangement.
Since pier is provided with deviation-rectifying bracket, it can control box beam and " shake the head " during pushing tow, to solve box beam " pendulum
Tail " is provided with box beam limiter, and limiter and box beam contact position use bearing, can rotate to limit case with box beam movement
Beam offset, and meet incremental launching construction required precision.Limiter is fixed on beam making bench side by fining twisted steel.Limiter is such as
Shown in Figure 12.
(9) pier rigid connecting systems: rigid connecting systems arrangement is as shown in figure 13.
(10) personnel working platform: setting up full framing workbench, and bracket frame pipe uses 48 × 3.5mm of φ fastener type
Steel pipe laterally, longitudinal direction, is vertically set up with 90cm spacing and (is set up first row transverse and longitudinal frame pipe from original ground 70cm height).In
The upper descending stair step of designer in operation platform interior direction bracket, except first order interval platform is arranged in addition to 2.5m eminence, often on
Interval platform at row 1.8m high setting one.It is closed with safety guard net full framing periphery.
Before workbench is set up, artificial levelling compacting first carried out to ground base, and every steel pipe bottom placement 20 ×
The C30 concrete pad of 20 × 10cm.
When box beam pushing tow, construction personnel station completes progress sliding block on the platform of bridge pier longitudinal direction two sides and is fed into, takes out, carries
Work；Rear (Luo Liangqian), You Luoliang jack jack up girder about 3cm make beam body leave slideway, are cut with gas cutting beam body pushing tow in place
Except slideway and bent cap embedded board interconnecting piece, then with (under the beam body edge of a wing, minimum is net on 5T chain coaster pulling slideway to workbench
Empty 2.69m), finally on crane handling slideway to ground.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (1)
1. the cross-line bridge single-point successively incremeantal launching method construction method of a kind of overcrossing railway, highway: using successively incremeantal launching method jack,
Steel wire bundle, automated tool anchor, fashioned iron reaction frame and preceding anchored end system realize successively incremeantal launching method；
It passes through the continuous work of successively incremeantal launching method jack, is carried out continuously the pushing tow operation of one section of beam body, to improve beam body
Pushing tow speed, it is characterised in that: the following steps are included:
(1), unit in charge of construction marches into the arena, three supplies and one leveling；Impacted railway setting is transformed；Clear table is excavated to design excavation
Line；Smooth precasting yard place；
(2), construction abutment to platform cap, construction pile foundation of bridge pier, pier stud, bent cap；Pier of constructing is rigidly connected；Constructing prefabricated beam field,
Pedestal slideway；Chute system is formed by beam making bench slideway and each pier slideway, chute system is to realize the smooth pushing tow of box beam
Key, beam making bench slideway include chute board, sliding block and cover board, and pier slideway includes slideway block, chute board and sliding block；Liang Tai processed
Seat slideway uses continuous slideway, completely spreads chute board, sliding block, cover board on the continuous slideway wall of beam making bench；Chute board is Q235 steel
Plate is made up of the stainless steel plate of dormant bolt outsourcing 2mm thickness, slideway board ends be all provided with transition slope section with non-slipping block it is mobile by
Resistance；Sliding block uses interlayer of steel plate hot pressing rubber and polyfluortetraethylene plate to suppress in factory with special process；Cover board is by 5mm thickness
Upper cover plate, 10mm thickness the Q235 steel plate of two kinds of specifications of lower cover plate be welded, as a part of bed die, to prevent box beam
Spillage when casting concrete, cover board upper and lower plates front-back staggered 10mm are connected in the form of mother-son mouth with bed die junction mismatch 10mm
It connects；Pier slideway is the important fulcrum slideway that box beam is advanced along pushing tow direction, is placed in pier using the structure of fashioned iron and steel plate composition
On platform；Pier slideway sliding block is identical as sliding block used in beam making bench；
(3), formwork supporting plate, assembling reinforcement pour box beam, stretch-draw prestressing force steel beam；One-piece casting completes whole cast-in-situ box girders；And
Guardrail construction is completed in box beam two sides, installs central drainage facility；The steel member of factory's customization steel nose girder；
(4), the assembled steel nose girder on beam making bench；Slideway, pushing tow facility, guiding device are installed in pier top surface；Dragline is worn to draw
Rope adjusts pulling equipment, and carries out test pushing tow to beam body, verifies pushing tow system effectiveness；
Wherein, pushing tow system includes successively incremeantal launching method jack, rear anchor beam, counterforce device and traction steel strand wires；Successively incremeantal launching method is very heavy
Top is the power device of pushing tow system, and according to the calculating to practical jacking force, automatic continuous jacking jack is set on abutment, even
Top is equipped with automated tool anchor and travel switch before and after continuous pushing tow jack, and is furnished with the automatic continuous jacking oil pump of double oil circuits；
To guarantee that successively incremeantal launching method axis is consistent with rear anchor beam anchor circle center and fixes successively incremeantal launching method jack, if successively incremeantal launching method
Jack horizontal tray, successively incremeantal launching method jack are placed on horizontal tray；Horizontal tray is welded by fashioned iron and steel plate, is passed through
Steel plate and the welding of pre-buried fining twisted steel are anchored on abutment platform cap；
(5), the sundries on steel nose girder, the sundries of removing case top surface of the beam are removed；Box beam incremental launching construction, first stage are carried out stage by stage
Without Midspan sag, highway incremental launching construction, speed control is in 35~38cm/min, calculating speed 22m/h；To box girder body into
Row monitoring, prevents deviation, deformation, beam body creeping phenomenon during pushing tow；
Cloth postpones anchor beam on continuous box girder tail end face: rear anchor beam is main load transfer device, rear anchor beam by I-steel bearing beam,
Anchor girder and I-steel anchoring beam composition afterwards；
In the I-shaped real abdomen plate girder of variable cross-section that box beam vertical shift front end corresponds to web position setting；As continuous box girder in pushing tow
Main force structure in the process, steel nose girder serve during pushing tow it is very crucial, it must have enough rigidity and
Bonding strength；Steel nose girder is customized using factory, on-site consolidation mode；Using Q345D steel；
(6), second stage box beam carries out Midspan sag, highway incremental launching construction, and speed control is in 35~38cm/min, calculating speed
22m/h is monitored box girder body, prevents deviation, deformation, beam body creeping phenomenon during pushing tow；It is right after this stage to complete
Beam body and steel nose girder carry out gib；
One observation station is set at abutment end, observes box beam and steel nose girder axis deviation and amount of deflection；It is arranged at precast beam field abutment end
Beam making bench settling amount is observed in one observation station；One observation station is set in Abutment again, observes the case during pushing tow with the quiet stopping time
Beam deflection, the settling amount of pier and horizontal displacement；
Deviation-rectifying system is formed by deviation-rectifying bracket and correction voussoir, deviation-rectifying bracket is welded by fashioned iron and steel plate, is existed by setting
The pre-embedded steel slab and fashioned iron reaction frame of bent cap side weld, and correction voussoir is made of two pieces of gad blocks；Since pier is provided with
Deviation-rectifying bracket can control box beam and " shake the head " during pushing tow, to solve box beam " wagging the tail ", be provided with box beam limiter, limit
Position device and box beam contact position use bearing, can rotate to limit box beam offset with box beam movement, and meet incremental launching construction
Required precision；Limiter is fixed on beam making bench side by fining twisted steel；
(7), phase III box beam pushing tow dropping place, by beam body pushing tow dropping place to Abutment, speed control is in 35~38cm/min, meter
Calculate speed 22m/h；Box beam is fixed temporarily, prevents box beam from returning rebound backward because removing pulling equipment；Dismounting precast beam field,
Platform rear slide；
(8), steel nose girder is removed, beam-ends is smoothed out with concrete；Tensioning later period beam and the earlier beam of relaxation part；Pulling equipment is removed,
Remove fashioned iron reaction frame；Permanent support is installed on bearing pad stone；Successively incremeantal launching method jack is set on pier,
Beam body is jacked up；It removes slideway and slideway cushion block and is moved to what steel pipe was set up with 5T chain coaster after slideway cushion block is removed
On full hall formula workbench, under the beam body edge of a wing, then with crane it is hoisted to ground；
The full corresponding bracket frame pipe of hall formula workbench uses 48 × 3.5mm of φ fastener type steel pipe, laterally, it is longitudinal, vertical with
90cm spacing is set up, and sets up first row transverse and longitudinal frame pipe from original ground 70cm height；In full hall formula workbench interior direction branch
The upper descending stair step of designer in frame, except first order interval platform is arranged in addition to 2.5m eminence, at every uplink 1.8m high setting one between
It has a rest platform；It is closed with safety guard net full framing periphery；Before full hall formula workbench is set up, first ground base is carried out
Artificial levelling compacting, and in the C30 concrete pad of every steel pipe bottom placement 20 × 20 × 10cm of；
(9), beam is fallen, simultaneously operating jack falls beam body steadily on beam to permanent support；Remove pier rigid connection；It completes
The construction of abutment hearing wall, bridge pier block；It bankets after construction platform, attachment strap；
(10), completion is secondary mats formation；Set up anti-throwing net, monitoring power grid；Complete central drainage facility；At bridge operation；
When box beam pushing tow, construction personnel station completes progress sliding block on the platform of bridge pier longitudinal direction two sides and is fed into, takes out, porter
Make；Beam body pushing tow in place after, Luo Liangqian, You Luoliang jack jack up girder about 3cm make beam body leave slideway, are cut off with gas cutting
Slideway and bent cap embedded board interconnecting piece, then pulled on slideway to workbench with 5T chain coaster, under the beam body edge of a wing, minimum headroom
2.69m, finally on crane handling slideway to ground.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108625271B (en) * | 2018-06-29 | 2020-02-07 | 李坤华 | Continuous beam bridge and incremental launching construction method thereof |
| CN111058379A (en) * | 2018-10-16 | 2020-04-24 | 武汉思力特种工程机械施工有限公司 | Walking type sliding and pushing construction method for bridge construction |
| CN110080102A (en) * | 2019-04-26 | 2019-08-02 | 中铁武汉勘察设计研究院有限公司 | A kind of bridge deck drainage structure across railroad bridge |
| CN113322832A (en) * | 2021-07-13 | 2021-08-31 | 广西北投公路建设投资集团有限公司 | Bridge incremental launching construction technology |
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