CN106120568B - The construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure - Google Patents

The construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure Download PDF

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Publication number
CN106120568B
CN106120568B CN201610688768.1A CN201610688768A CN106120568B CN 106120568 B CN106120568 B CN 106120568B CN 201610688768 A CN201610688768 A CN 201610688768A CN 106120568 B CN106120568 B CN 106120568B
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China
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steel pipe
steel
pipe column
plate
construction
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CN201610688768.1A
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Chinese (zh)
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CN106120568A (en
Inventor
栾彬
孙安
李长圣
刘志旺
张子贵
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德州市公路工程总公司
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Publication of CN106120568A publication Critical patent/CN106120568A/en
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Publication of CN106120568B publication Critical patent/CN106120568B/en

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

Abstract

The present invention relates to cross a river Main Bridge bridge pier secondary locking temporary consolidation structure, mainly include steel pipe column, steel pipe column connection end, anchor cable, screw-thread steel, bracket, temporary support and adjustable form support system, steel pipe column is arranged on cushion cap, and anchored with the steel pipe column connection end that is embedded in cushion cap, anchor cable and screw-thread steel are provided with steel pipe column, anchor cable and screw-thread steel anchoring lower ends are in the connection end plate in steel pipe column connection end, and upper end is anchored in cast-in-situ box girder bottom plate;Pier top is installed in temporary support, temporary support and is provided with pre-buried screw-thread steel;Set on steel pipe column bracket and support seat is set on bracket, bracket, support seat top surface installs bed die, and monoblock type flank template adjusts setting angle by adjustable strut, and is connected with bed die;Core is supported by adjustable cross inner support.The present invention uses secondary anchoring system, successfully solves 0#Discontinuity problem when block is constructed.Present invention also offers the construction method of above-mentioned cross a river Main Bridge bridge pier secondary locking temporary consolidation structure.

Description

The construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure
Technical field
The present invention relates to a kind of construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure.Belong to bridge work Journey field, it is adaptable to Main Bridge bridge pier 0#The temporary consolidation construction of block, is particularly suitable for use in the main pier 0 under pier beam oblique operating mode#Block Construction.
Background technology
With the development of society, the across footpath of continuous bridge is increasing, it is more and more that the blue construction method of extension is used, but adopts The problem of there is system transform with the continuous bridge for hanging blue construction method foundation, No. zero block exists by temporary consolidation in the construction stage Become into the system transform of bridge seat, different anchor types have opposite impacts on to No. zero block internal force, therefore in the design should Take into full account the anchor type of No. zero block.
In No. zero block anchoring temporarily design of continuous bridge, traditional anchoring temporarily form directly sets interim on main pier Bearing, by fining twisted steel by No. zero block and main pier temporary consolidation, or on main pier sets up interim bracket, to No. zero block Temporary consolidation is carried out, the construction of such temporary consolidation method is simple, but be difficult to ensure that under pier beam oblique operating mode the stress of No. zero block Equilibrium, for the situation of pier beam oblique, existing follow-on temporary consolidation form, for example, set temporary support in pier top at present Set simultaneously on main cushion cap in temporary rest pier, temporary support and temporary rest pier and prestressing tendon all be set using cast-in-place concrete, The beam bottom of cushion cap, buttress and No. zero block is consolidated by prestressing tendon, but the construction of such a temporary consolidation method is complex, Particularly temporary rest pier inner concrete pour and prestressing tendon it is embedded, further relate to temporary rest pier stability problem, exist compared with Big optimization space.
In consideration of it, needing that a kind of constructing operation of invention is simple badly at present, 0 under pier beam oblique operating mode#Block stress equalization, economic skill No. zero block temporary consolidation structure and construction method that art benefit is protruded.The present invention uses secondary anchoring system, in pier top both sides system Make temporary support, and in the pre-buried fining twisted steel in every side, 0 is stretched into by temporary support#In block, the 1st Dun Liang locking is formed, together When screw-thread steel and anchor cable are buried in supporting steel tubing string, be anchored on cast-in-situ box girder bottom plate, form the 2nd locking of cushion cap, beam, So as to be effectively ensured 0#Block uniform force, wherein steel pipe column are anchored by the built-in fitting in bolt and cushion cap, and in the middle part of steel pipe Set buckle-type fixation steel plate that all steel pipe columns are connected into integral, greatly improve the stability of steel pipe support, and difficulty of construction It is small, with preferable economic technology benefit.
The content of the invention
It is high it is an object of the invention to provide a kind of safety of structure, 0 under pier beam oblique operating mode#Block stress equalization, and warp Cross a river Main Bridge bridge pier secondary locking temporary consolidation structure and construction method that technical benefits of helping is protruded.
To realize above-mentioned technical purpose, present invention employs following technical scheme:
A kind of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure, it is characterised in that mainly including steel pipe column, steel pipe Post connection end, anchor cable, screw-thread steel, bracket, temporary support and adjustable form support system, steel pipe column are arranged on cushion cap, and Anchored with the steel pipe column connection end that is embedded in cushion cap, anchor cable and screw-thread steel, anchor cable and screw-thread steel lower end are provided with steel pipe column The connection end plate in steel pipe column connection end is anchored in, upper end is anchored in cast-in-situ box girder bottom plate;Pier top installs temporary support, interim branch Pre-buried screw-thread steel is provided with seat;It is provided with steel pipe column bracket on bracket, bracket and support seat is set, support seat top surface installs bed die, Monoblock type flank template adjusts setting angle by adjustable strut, and is connected with bed die;Core passes through adjustable cross Type inner support is supported.
Further, steel pipe column connection end main body is in and welds to set connection end plate in the middle of cylindrical structure, barrel, pre- on connection end plate Anchor cable hole and screw-thread steel hole are stayed, it is disc structure, disk that barrel bottom, which is reserved at the top of the horizontal cage bar holes of cushion cap, steel pipe column connection end, Steel pipe column link bolt hole is uniformly reserved on surface, and disk absolute altitude is consistent with cushion cap top surface absolute altitude.
Described steel pipe column bottom is provided with annular bottom plate, and annular bottom plate uniformly reserves steel pipe column link bolt hole, aperture, hole Away from consistent with the disk at the top of steel pipe column connection end, provided with two layers of annular wing plate in the middle of steel pipe column, set between annular wing plate Buckle-type fixation steel plate is put, steel pipe column top is provided with bracket.
The described rectangular ring-type of buckle-type fixation steel plate, by four blocks of L-shaped steel plates, anchoring is formed mutually, L-shaped steel plate two ends End plate is equipped with, end plate is provided with bolt hole.
Anchor cable bottom in described steel pipe column is provided with anchored end, from bottom to top through the connection end in steel pipe column connection end Plate is anchored on cast-in-situ box girder bottom plate, and cast-in-situ box girder base plate interior presets pvc pipe and is used as anchor cable passage.
Screw-thread steel bottom in described steel pipe column is provided with anchored end, from bottom to top through the connection in steel pipe column connection end End plate is anchored on cast-in-situ box girder bottom plate, and cast-in-situ box girder base plate interior presets pvc pipe and is used as screw-thread steel passage.
Described bracket is main assembled by beret truss, in the shaped steel distribution beam of steel pipe column bracket, and and pier Built-in connection anchoring on wall.
Described temporary support is arranged on the permanent bearing both sides of pier top, and temporary support both sides are provided with regulatable supporter screw rod, Pre-buried screw-thread steel in the fully wrapped around pier stud of temporary support concrete, and screw-thread steel upper end stretched into cast-in-situ box girder.
Described monoblock type flank template is supported using Bailey beam, and monoblock type flank die head is provided with to drawing steel to twist Line.
Described core is separate structure up and down, is fixed using adjustable cross inner support and jury strut.
Present invention also offers the construction method of the cross a river Main Bridge bridge pier secondary locking temporary consolidation structure, its is main Construction procedure is as follows:
(1)Suspended deck structure pouring construction:According to design drawing colligation cushion cap reinforcing bar after Stake head handling in pile foundation, setting Position pre-buried steel tubing string connection end is counted, and cushion cap horizontal cage bar in part is passed through into the preformed hole of steel pipe column connection end, and welds solid It is fixed, anchor one section of screw-thread steel and anchor cable on the connection end plate of steel pipe column connection end in advance, then install cushion cap template casting concrete, And pour expansive concrete in steel pipe column connection end;
(2)Pier shaft pouring construction:After the completion of bearing platform construction, colligation pier stud reinforcing bar, and connected according to the pre-buried bracket of design drawing Fitting, while setting pre-buried screw-thread steel in pier top relevant position, then installs pier body formwork casting concrete;
(3)Temporary support and permanent bearing are installed:After the completion of pier shaft concrete curing, installed according to design drawing in pier top Permanent bearing and temporary support, wherein temporary support use C50 concrete cast-in-situs, are arranged in permanent bearing both sides, temporary support Surrounding installs regulatable supporter screw rod;
(4)Screw-thread steel, anchor cable are synchronous with steel pipe column to be installed:Screw-thread steel is penetrated after steel pipe column with anchor cable, is hung using 25t loop wheel machines Dress, before steel pipe column is in place, using connector by the screw-thread steel in steel pipe column and anchor cable and the screw-thread steel in steel pipe column connection end with Anchor cable is connected one to one, then is anchored by steel pipe column dropping place and with steel pipe column connection end, and card is installed between the annular wing plate of steel pipe column Button fixation steel plate and laying bridging;
(5)Bracket system is assembled:Bracket first forms Bailey beam structure using beret truss assembly, in advance in steel pipe column during installation Set on bracket shaped steel distribution beam, shaped steel distribution beam fix after ceiling mount bracket system, and by the part beret truss and pier in bracket Post built-in fitting is connected;
(6)Bed die is installed:Use and bed die laying is manually carried out for the mode of main mechanical engagement, before laying in advance on bracket Lay and preset pier stud reserved steel bar and steel pipe column internal thread steel, the duct of anchor cable on support seat, bed die, and carry out the envelope in duct gap Stifled measure;
(7)Monoblock type flank template is installed:Monoblock type flank template is installed using crane, is existed before installing according to construction drawing Flank falsework is set up using beret truss on the basis of existing bracket, passes through the adjustable support in Bailey beam support after the completion of setting up Bar and adjustable diagonal brace adjust flank template angle, position and reinforced;
(8)Colligation bottom plate, web, partition wall reinforcing bar and prestressed pore passage:According to design requirement, first regular reinforcement is made Plane or three-dimensional framework, integral hoisting, placement after welding, colligation shaping;Wherein baseplate reinforcing bar according to design drawing in steel pipe column The pre-buried pvc pipe of position directly above, and the anchor cable in steel pipe column is fixed temporarily with baseplate reinforcing bar, prevent from sliding in steel pipe; After the completion of web and tabula beam steel bar colligation, the installation of bellows and anchor plate is carried out according to design requirement;
(9)Core is installed:Core pre-production is into block up and down, by the lifting of whole section of autocrane, then carries out on beam section Assembly between section is connected, and is equidistantly used as main support, conventional steel pipe support conduct using adjustable cross inner support Jury strut is fixed, and half block relevant position sets anchor plate under core, by the screw-thread steel and anchorage cable anchoring in steel pipe column;
(10)Pour 0# block beam body concrete:Concrete is conveyed into mould by concrete mixer, first bottom plate, rear abdomen during cast Plate, place is carried out from low to high, and ensures symmetrically to pour, and the 1st Dun Liang locking is formed using the reserved steel bar in pier stud;
(11)Top plate, the reinforcing bar of edge of a wing plate part, concrete construction:Bottom plate, web concrete casting complete can enter after 3 days Row top plate, the reinforcing bar of flange plate and concrete construction, the same bottom plate of its construction method, web are essentially identical, wherein both sides flange plate Top sets steel strand;
(12)Maintenance, dismounting core:Using watering maintenance, the surface wettability of box beam concrete is kept, box beam concrete is strong Degree removes core when reaching the 50% of design strength, and the anchor cable in steel pipe column is carried out tensioning formed cushion cap, the 2nd time of beam it is complete Full locking;
(13)Prestressed stretch-draw:Beam body concrete strength reaches that design allows tensioning intensity and the age of concrete meets design It is required that after, carry out prestressed stretch-draw;
(14)Slip casting sealing off and covering anchorage:After tension of prestressed tendon, hole path pressure grouting construction is carried out using vacuum aid grouting method;
(15)Form removal, removal falsework:The Demolition Construction of falsework is carried out after sealing off and covering anchorage on request.
The characteristics of present invention has following and beneficial effect:
(1)The present invention uses secondary anchoring system, and temporary support is made in pier top both sides, and in the pre-buried finish rolling screw thread in every side Steel, 0 is stretched into by temporary support#In block, the 1st Dun Liang locking is formed;Screw-thread steel and anchor are buried in supporting steel tubing string simultaneously Rope, is anchored on cast-in-situ box girder bottom plate, the 2nd locking of cushion cap, beam is formed, so as to be effectively ensured 0#Block uniform force.
(2)Steel pipe support and bracket combination application are effectively improved efficiency of construction, wherein steel pipe column passes through bolt by the present invention Anchored with the built-in fitting in cushion cap, and set buckle-type fixation steel plate that all steel pipe columns are connected into integral in the middle part of steel pipe, greatly Width improves the stability of steel pipe support.
(3)The present invention uses monoblock type flank template, and can be adjusted by the adjustable strut in Bailey beam support and diagonal brace Setting angle and position are saved, while core uses adjustable cross inner support as main support, conventional steel pipe is supported as auxiliary Help support to fix, greatly improve the installation accuracy and speed of cast-in-situ box girder template, the construction quality of cast-in-situ box girder is effectively ensured.
Brief description of the drawings
Fig. 1 is cross a river Main Bridge bridge pier secondary locking temporary consolidation structure elevation;
Fig. 2 is cross a river Main Bridge bridge pier secondary locking temporary consolidation structure side view;
Fig. 3 is Fig. 2 along A-A profiles.
In figure:1- pile foundations;2- cushion caps transverse direction cage bar;The vertical cage bar of 3- cushion caps;4- cushion caps;5- connection end plates;6- steel pipes Post connection end;7- end plate nuts;8- steel pipe column connecting bolts;9- screw-thread steels;10- steel pipe columns;11- pier studs;12- anchor cables;13- rings Shape wing plate;14- buckle-type fixation steel plates;15- brackets;16- yoke crossties;17- cradle couplers;18- pallet stringers;On 19- Portion's shaped steel distribution beam;20- supports seat;The permanent bearings of 21-;22- bed dies;23- flank falseworks;24-PVC is managed;25- anchor plates; The adjustable struts of 26-;The adjustable diagonal braces of 27-;28- adjusting meanss;29- monoblock type flank templates;30- cores;31- adjustable ten Font inner support;32- jury struts;33- steel strands;34- cast-in-situ box girders;35- steel strand anchorings end;36- bridgings;37- Bottom shaped steel distribution beam;38- temporary supports;The pre-buried screw-thread steels of 39-;40- regulatable supporter screw rods;41- cavitys;42-L shape steel plates End plate;43-L shape steel plate connecting screw rods;44-L shape steel plate coupling nuts.
Embodiment
Reinforcing bar colligation construction technical requirement in present embodiment, the construction process requirement of concreting, reinforcement welding work Skill requirement etc. is repeated no more, and emphasis illustrates the reality of the cross a river Main Bridge bridge pier secondary locking temporary consolidation structure being related to of the present invention Apply mode.
Fig. 1 is cross a river Main Bridge bridge pier secondary locking temporary consolidation structure elevation, and Fig. 2 is that cross a river Main Bridge bridge pier is secondary Lock temporary consolidation structure side view, Fig. 3 is Fig. 2 along A-A profiles.Referring to the drawings the shown secondary lock of cross a river Main Bridge bridge pier Determine temporary consolidation structure, mainly by steel pipe column 10, steel pipe column connection end 6, anchor cable 12, screw-thread steel 9, bracket, temporary support 38, can Mode form bracing system etc. is constituted.
Steel pipe column 10 is arranged on cushion cap 4, and is anchored with the steel pipe column connection end 6 that is embedded in cushion cap, in steel pipe column 10 Be provided with anchor cable 12 and screw-thread steel 9, anchor cable 12 and the anchoring lower ends of screw-thread steel 9 in the connection end plate 5 in steel pipe column connection end 6, on End is anchored in the bottom plate of cast-in-situ box girder 34;The top of pier stud 11, which is installed in temporary support 38, temporary support 38, is provided with pre-buried screw-thread steel 39;Set on steel pipe column bracket 15 and support seat 20 is set on bracket, bracket, support seat 20 top surface installs bed die 22, monoblock type flank mould Plate 29 adjusts setting angle by adjustable strut 26, and is connected with bed die 22;Core 30 is by adjustable cross Support 31 is supported.
During construction, pile crown cut finish pile measurement it is qualified after adopted according to design drawing colligation cushion cap reinforcing bar, cushion cap reinforcing bar With HRB335 grades, cushion cap specification is 15300mm × 10800mm × 2500mm, in the pre-buried 8 steel pipe column connection ends 6 of design attitude, The wherein external diameter 800mm of steel pipe column connection end 6, wall thickness 10mm, the top connection external diameter 1400mm of end plate 5, connection end plate 5 are reserved 6 Diameter 16mm bolt hole, passes through part cushion cap horizontal cage bar 2 when pre-buried the preformed hole at fastener for connection end, aperture is 15mm, And be welded and fixed, and one section of screw-thread steel 9 and anchor cable are anchored on the connection end plate 5 in each pre-buried steel tubing string connection end 6 in advance 12, screw-thread steel 9 uses JL32 finish rolling screw thread bar reinforcements, and quantity is 2, and a diameter of 21.6mm of anchor cable 12, quantity is 1, then is propped up If cushion cap template pours C35 concrete, cushion cap template is made up of the standard steel mould of standard 900 × 1500, mutually splicing shaping, then Expansive concrete to top is poured in pre-buried steel tubing string connection end and connects end plate absolute altitude.
After the completion of cushion cap 4 is constructed, colligation pier stud reinforcing bar is same using HRB335 grades of reinforcing bars, and pier stud is highly 10850mm, And according to the pre-buried cradle coupler 17 of design drawing, while setting pre-buried screw-thread steel 39, pre-buried screw-thread steel in pier top relevant position 39 anchoring lower ends 1500mm in pier shaft, anchors 1100mm through temporary consolidation in box beam bottom plate, then installs pier body formwork C35 concrete is poured, wherein pinner size is 240mm × 120mm × 60mm.After the completion for the treatment of pier shaft concrete curing, according to setting Count drawing and permanent bearing 21 and temporary support 38 are installed in pier top, wherein temporary support 38 uses C50 concrete cast-in-situs, is arranged in The permanent both sides of bearing 21, the surrounding of temporary support 38 installs regulatable supporter screw rod 40.
After bearing installation, screw-thread steel 9 and anchor cable 12 are penetrated into steel pipe column 10, lifted using 25t loop wheel machines, each No. zero Block designs 800 × 10mm of φ steel pipe columns 8 altogether, before steel pipe column 10 is in place, using connector by the screw-thread steel 9 and anchor in steel pipe column Rope 12 connects one to one with the screw-thread steel 9 in steel pipe column connection end 6 and anchor cable 12, then by the dropping place of steel pipe column 10 and and steel pipe column Connection end 6 is anchored, and is finally installed buckle-type fixation steel plate 14 between the annular wing plate 13 of steel pipe column and is laid bridging 36, wherein Buckle-type fixation steel plate 14 uses strength grade to be formed for Q335 steel are prefabricated.As illustrated, buckle-type fixation steel plate 14 is in Rectangular ring, by four blocks of L-shaped steel plates, anchoring is formed mutually, and L-shaped steel plate two ends are equipped with end plate 42, and end plate 42 is provided with bolt Hole.
After the rigging out of steel pipe column 10, the interim colligation of anchor cable 12 at top is fixed, bracket is subsequently mounted, bracket is first used Beret truss assembly forms Bailey beam structure, sets I45 shaped steel distribution beams, shaped steel distribution during installation on steel pipe column bracket 15 in advance Beam lifts 4 groups of Bailey beam crossbeams after fixing, Bailey beam top sets I28 shaped steel distribution beams, and top sets 450mm × 450mm step pitches Bowl button support and support seat, and the part beret truss in Bailey beam and pier stud built-in fitting are connected, side form support is using 2 groups of shellfishes Lei Liang.
After the completion of pallet body lifting, bed die 22 and monoblock type flank template 29 are installed, pin, circular arc portion are using customization steel Template, template is installed using crane lifting human assistance, and wherein monoblock type flank template 29 passes through adjustable diagonal brace 27 and can The adjusting means 28 of mode strut 26 adjusts angle, position and reinforced.According to design requirement after model sheetinstallat, first by regular reinforcement Plane or three-dimensional framework, integral hoisting, placement after welding, colligation shaping is made;Wherein baseplate reinforcing bar according to design drawing in steel The pre-buried diameter 600mm of the position directly above of tubing string 10 pvc pipe 24, and the anchor cable 12 in steel pipe column 10 and baseplate reinforcing bar is temporarily solid It is fixed, prevent from sliding in steel pipe;After the completion of web and tabula beam steel bar colligation, prestress pipe peace is carried out according to design requirement Set position, string beam.
After qualified on inspection, the vertical core 30 of branch, colligation roof steel bar.The pre-production of core 30 is into block up and down, by automobile Whole section of lifting of heavy-duty machine, then the assembled connection on beam between progress section and section, and equidistantly use adjustable cross inner support 31 As main support, conventional steel pipe support is fixed as jury strut 32, and half block relevant position sets anchor plate 25 under core, will Screw-thread steel 9 and anchor cable 12 in steel pipe column are anchored.
Box beam uses C50 concretings, and concrete is conveyed into mould by concrete mixer, first bottom plate, rear abdomen during cast Plate, place is carried out from low to high, and ensures symmetrically to pour, and the 1st Dun Liang locking is formed using the reserved steel bar in pier stud.Bottom plate, Web concrete casting complete can carry out top plate, the reinforcing bar of flange plate and concrete construction after 3 days, its construction method and bottom plate, Web is essentially identical, and diameter 12mm steel strand 33 is wherein set at the top of the flange plate of both sides.
Box beam concrete is conserved using watering, and holding surface moistening, box beam concrete intensity reaches the 50% of design strength When, remove core 30, and the anchor cable 12 in steel pipe column is carried out tensioning formed cushion cap, the 2nd time of beam it is fully locked.Treat internal pre- After stress rib tensioning, hole path pressure grouting construction is carried out using vacuum aid grouting method, press mortar is that neat slurry is mixed and stirred at scene, is adopted With the Portland cements of P.O 42.5, the water of qualified water.
After the completion of above-mentioned construction, interim making, and progressively removal bracket and steel pipe column are cut, construction is completed.
The construction key step of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure is as follows:
(1)Suspended deck structure pouring construction:According to design drawing colligation cushion cap reinforcing bar after Stake head handling in pile foundation 1, Design attitude pre-buried steel tubing string connection end 6, and cushion cap horizontal cage bar 2 in part is passed through into the preformed hole of steel pipe column connection end 6, and weld Connect and anchor one section of screw-thread steel 9 and anchor cable 12 on fixation, the connection end plate 5 of steel pipe column connection end 6 in advance, then install cushion cap template and pour Concrete is built, and expansive concrete is poured in steel pipe column connection end 6.
(2)Pier shaft pouring construction:After the completion of cushion cap 4 is constructed, the reinforcing bar of colligation pier stud 11, and according to the pre-buried bracket of design drawing Connector 17, while setting pre-buried screw-thread steel 39 in pier top relevant position, then installs pier body formwork casting concrete.
(3)Temporary support and permanent bearing are installed:After the completion of pier shaft concrete curing, installed according to design drawing in pier top Permanent bearing 21 and temporary support 38, wherein temporary support 38 use C50 concrete cast-in-situs, are arranged in the permanent both sides of bearing 21, The surrounding of temporary support 38 installs regulatable supporter screw rod 40.
(4)Screw-thread steel, anchor cable are synchronous with steel pipe column to be installed:Screw-thread steel 9 is penetrated after steel pipe column 10 with anchor cable 12, using 25t Loop wheel machine is lifted, before steel pipe column 10 is in place, using connector by the screw-thread steel 9 in steel pipe column and anchor cable 12 and steel pipe column connection end 6 Interior screw-thread steel connects one to one with anchor cable, then is anchored by steel pipe column dropping place and with steel pipe column connection end, finally in steel pipe column Buckle-type fixation steel plate 14 is installed between annular wing plate 12 and bridging 36 is laid.
(5)Bracket system is assembled:Bracket first forms Bailey beam structure using beret truss assembly, in advance in steel pipe column during installation On bracket 15 set shaped steel distribution beam, shaped steel distribution beam fix after ceiling mount bracket system, and by the part beret truss in bracket with Pier stud built-in fitting is connected.
(6)Bed die is installed:Use and manually carry out bed die 22 for the mode of main mechanical engagement and lay, in advance in bracket before laying Upper lay presets pier stud reserved steel bar and steel pipe column internal thread steel, the duct of anchor cable on support seat 20, bed die, and carries out duct gap Close measure.
(7)Monoblock type flank template is installed:Monoblock type flank template 29 is installed using crane, according to construction drawing before installing Flank falsework 23 is set up using beret truss on the basis of existing bracket, by adjustable in Bailey beam support after the completion of setting up Formula strut and adjustable diagonal brace adjust flank template angle, position and reinforced.
(8)Colligation bottom plate, web, partition wall reinforcing bar and prestressed pore passage:According to design requirement, first regular reinforcement is made Plane or three-dimensional framework, integral hoisting, placement after welding, colligation shaping;Wherein baseplate reinforcing bar according to design drawing in steel pipe column The pre-buried pvc pipe 24 of position directly above, and the anchor cable 12 in steel pipe column is fixed temporarily with baseplate reinforcing bar, prevent from sliding into steel pipe It is interior;After the completion of web and tabula beam steel bar colligation, the installation of bellows and anchor plate 25 is carried out according to design requirement.
(9)Core 30 is installed:The pre-production of core 30 is into block up and down, and by autocrane, whole section lifts, then enterprising in beam Assembled connection between row section and section, and main support, conventional steel pipe branch are equidistantly used as using adjustable cross inner support 31 Support is fixed as jury strut 32, and half block relevant position sets anchor plate 25 under core, by the screw-thread steel 9 and anchor cable in steel pipe column 12 anchorings.
(10)Pour 0# block beam body concrete:Concrete is conveyed into mould by concrete mixer, first bottom plate, rear abdomen during cast Plate, place is carried out from low to high, and ensures symmetrically to pour, and the 1st Dun Liang locking is formed using the reserved steel bar in pier stud.
(11)Top plate, the reinforcing bar of edge of a wing plate part, concrete construction:Bottom plate, web concrete casting complete can enter after 3 days Row top plate, the reinforcing bar of flange plate and concrete construction, the same bottom plate of its construction method, web are essentially identical, wherein both sides flange plate Top sets steel strand 33.
(12)Maintenance, dismounting core:Using watering maintenance, the surface wettability of box beam concrete is kept, box beam concrete is strong Degree removes core when reaching the 50% of design strength, and the anchor cable in steel pipe column is carried out tensioning formed cushion cap, the 2nd time of beam it is complete Full locking.
(13)Prestressed stretch-draw:Beam body concrete strength reaches that design allows tensioning intensity and the age of concrete meets design It is required that after, carry out prestressed stretch-draw.
(14)Slip casting sealing off and covering anchorage:After tension of prestressed tendon, hole path pressure grouting construction is carried out using vacuum aid grouting method.
(15)Form removal, removal falsework:The Demolition Construction of falsework is carried out after sealing off and covering anchorage on request.

Claims (9)

1. the construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure, it is characterised in that the cross a river Main Bridge Bridge pier secondary locking temporary consolidation structure mainly includes steel pipe column, steel pipe column connection end, anchor cable, screw-thread steel, bracket, temporary support With adjustable form support system, steel pipe column is arranged on cushion cap, and is anchored with the steel pipe column connection end that is embedded in cushion cap, steel Anchor cable and screw-thread steel are provided with tubing string, anchor cable and screw-thread steel anchoring lower ends are in the connection end plate in steel pipe column connection end, upper end It is anchored in cast-in-situ box girder bottom plate;Pier top is installed in temporary support, temporary support and is provided with pre-buried screw-thread steel;Set on steel pipe column bracket It is equipped with bracket, bracket and support seat is set, support seat top surface installs bed die, and monoblock type flank template is adjusted by adjustable strut and installed Angle, and be connected with bed die;Core is supported by adjustable cross inner support;
The construction method key step is as follows:
(1)Suspended deck structure pouring construction:According to design drawing colligation cushion cap reinforcing bar after Stake head handling in pile foundation, in design position Pre-buried steel tubing string connection end is put, and cushion cap horizontal cage bar in part is passed through into the preformed hole of steel pipe column connection end, and is welded and fixed, steel Anchor one section of screw-thread steel and anchor cable on the connection end plate of tubing string connection end in advance, then install cushion cap template casting concrete, and Steel pipe column pours expansive concrete in connection end;
(2)Pier shaft pouring construction:After the completion of bearing platform construction, colligation pier stud reinforcing bar, and according to the pre-buried cradle coupler of design drawing, Pre-buried screw-thread steel is set in pier top relevant position simultaneously, pier body formwork casting concrete is then installed;
(3)Temporary support and permanent bearing are installed:After the completion of pier shaft concrete curing, install permanent in pier top according to design drawing Bearing and temporary support, wherein temporary support use C50 concrete cast-in-situs, are arranged in around permanent bearing both sides, temporary support Regulatable supporter screw rod is installed;
(4)Screw-thread steel, anchor cable are synchronous with steel pipe column to be installed:Screw-thread steel is penetrated after steel pipe column with anchor cable, is lifted using 25t loop wheel machines, Before steel pipe column is in place, using connector by the screw-thread steel in steel pipe column and anchor cable and the screw-thread steel and anchor cable in steel pipe column connection end Connect one to one, then anchored by steel pipe column dropping place and with steel pipe column connection end, buckle-type is installed between the annular wing plate of steel pipe column Fixation steel plate and laying bridging;
(5)Bracket system is assembled:Bracket first forms Bailey beam structure using beret truss assembly, in advance in steel pipe column bracket during installation Upper setting shaped steel distribution beam, ceiling mount bracket system after shaped steel distribution beam is fixed, and the part beret truss and pier stud in bracket is pre- Embedded part is connected;
(6)Bed die is installed:Use and bed die laying is manually carried out for the mode of main mechanical engagement, laid in advance on bracket before laying Support and pier stud reserved steel bar and steel pipe column internal thread steel, the duct of anchor cable are preset on seat, bed die, and carry out the closure in duct gap and arrange Apply;
(7)Monoblock type flank template is installed:Monoblock type flank template is installed using crane, according to construction drawing existing before installing Flank falsework is set up using beret truss on the basis of bracket, after the completion of setting up by the adjustable strut in Bailey beam support and Adjustable diagonal brace regulation flank template angle, position are simultaneously reinforced;
(8)Colligation bottom plate, web, partition wall reinforcing bar and prestressed pore passage:According to design requirement, plane first is made in regular reinforcement Or three-dimensional framework, integral hoisting, placement after welding, colligation shaping;Wherein baseplate reinforcing bar according to design drawing steel pipe column just on Pre-buried pvc pipe is put in orientation, and the anchor cable in steel pipe column is fixed temporarily with baseplate reinforcing bar, prevents from sliding in steel pipe;In web And after the completion of tabula beam steel bar colligation, the installation of bellows and anchor plate is carried out according to design requirement;
(9)Core is installed:Core pre-production is into block up and down, by whole section of lifting of autocrane, then progress section and section on beam Between assembled connection, and equidistantly using adjustable cross inner support as main support, conventional steel pipe support is used as auxiliary Strut is fixed, and half block relevant position sets anchor plate under core, by the screw-thread steel and anchorage cable anchoring in steel pipe column;
(10)Pour 0# block beam body concrete:Concrete is conveyed into mould by concrete mixer, first bottom plate, trailing web during cast, Place is carried out from low to high, and ensures symmetrically to pour, and the 1st Dun Liang locking is formed using the reserved steel bar in pier stud;
(11)Top plate, the reinforcing bar of edge of a wing plate part, concrete construction:Bottom plate, web concrete casting complete can be pushed up after 3 days Plate, the reinforcing bar of flange plate and concrete construction, the same bottom plate of its construction method, web are essentially identical, wherein at the top of the flange plate of both sides Steel strand is set;
(12)Maintenance, dismounting core:Using watering maintenance, the surface wettability of box beam concrete is kept, box beam concrete intensity reaches To design strength 50% when, remove core, and tensioning carried out to the anchor cable in steel pipe column and form cushion cap, the 2nd time of beam lock completely It is fixed;
(13)Prestressed stretch-draw:Beam body concrete strength reaches that design allows tensioning intensity and the age of concrete meets design requirement Afterwards, prestressed stretch-draw is carried out;
(14)Slip casting sealing off and covering anchorage:After tension of prestressed tendon, hole path pressure grouting construction is carried out using vacuum aid grouting method;
Form removal, removal falsework:The Demolition Construction of falsework is carried out after sealing off and covering anchorage on request.
2. construction method according to claim 1, it is characterised in that described steel pipe column connection end main body is in cylindrical structure, Weldering sets and anchor cable hole and screw-thread steel hole is reserved on connection end plate, connection end plate in the middle of barrel, and the horizontal cage bar of cushion cap is reserved in barrel bottom It is disc structure at the top of hole, steel pipe column connection end, disc surfaces uniformly reserve steel pipe column link bolt hole, disk absolute altitude and cushion cap Top surface absolute altitude is consistent.
3. construction method according to claim 2, it is characterised in that described steel pipe column bottom is provided with annular bottom plate, annular Bottom plate uniformly reserves consistent, the steel pipe column on the disk at the top of steel pipe column link bolt hole, aperture, pitch-row and steel pipe column connection end Centre is provided between two layers of annular wing plate, annular wing plate and sets buckle-type fixation steel plate, and steel pipe column top is provided with bracket.
4. construction method according to claim 3, it is characterised in that the described rectangular ring-type of buckle-type fixation steel plate, by Anchoring is formed four blocks of L-shaped steel plates mutually, and L-shaped steel plate two ends are equipped with end plate, and end plate is provided with bolt hole.
5. construction method according to claim 1, it is characterised in that the anchor cable bottom in steel pipe column is provided with anchored end, under And on be anchored in through the connection end plate in steel pipe column connection end on cast-in-situ box girder bottom plate, cast-in-situ box girder base plate interior presets PVC Pipe is used as anchor cable passage.
6. construction method according to claim 1, it is characterised in that the screw-thread steel bottom in steel pipe column is provided with anchored end, by It is anchored on down through the connection end plate in steel pipe column connection end on cast-in-situ box girder bottom plate, cast-in-situ box girder base plate interior is preset Pvc pipe is used as screw-thread steel passage.
7. construction method according to claim 1, it is characterised in that described bracket is main assembled by beret truss, peace Anchored in the shaped steel distribution beam of steel pipe column bracket, and with the built-in connection on Dun Bi.
8. construction method according to claim 1, it is characterised in that described temporary support is arranged on the permanent bearing of pier top Both sides, temporary support both sides are provided with screw-thread steel pre-buried in regulatable supporter screw rod, the fully wrapped around pier stud of temporary support concrete, And screw-thread steel upper end is stretched into cast-in-situ box girder.
9. construction method according to claim 1, it is characterised in that described monoblock type flank template uses Bailey beam branch Support, monoblock type flank die head is provided with steel strand.
CN201610688768.1A 2016-08-18 2016-08-18 The construction method of cross a river Main Bridge bridge pier secondary locking temporary consolidation structure CN106120568B (en)

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