CN104695333B - Construction method of curved-surface arc-shaped main towers of cross-river single-cable suspension bridge - Google Patents

Construction method of curved-surface arc-shaped main towers of cross-river single-cable suspension bridge Download PDF

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Publication number
CN104695333B
CN104695333B CN201410708019.1A CN201410708019A CN104695333B CN 104695333 B CN104695333 B CN 104695333B CN 201410708019 A CN201410708019 A CN 201410708019A CN 104695333 B CN104695333 B CN 104695333B
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China
Prior art keywords
tower
hanging basket
bridge
sections
head tower
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CN201410708019.1A
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Chinese (zh)
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CN104695333A (en
Inventor
李定有
黄文国
丁得志
杨铭
孙爱军
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中铁四局集团第五工程有限公司
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Publication of CN104695333A publication Critical patent/CN104695333A/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
    • E01D21/06Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00Suspension or cable-stayed bridges
    • E01D11/02Suspension bridges

Abstract

A construction method of curved-surface arc-shaped main towers of a cross-river single-cable suspension bridge comprises steps as follows: the double-curved-surface arc-shaped towers are manufactured in a factory, and the steel towers are disassembled and transported to bridge sites after assembled and matched; the steel towers are lifted by a floating crane, the floating crane lifts the steel towers with double hooks, tower body postures are adjusted preliminarily, the steel towers are lifted to mounting positions slowly and pin-connected and fixed through matching parts arranged in section box openings of the steel towers, the steel towers are mounted, a transverse brace is arranged in every other one section of tower body during mounting, the steel towers are limited and prevented from inclining inwards, and folding of the steel towers is facilitated; measurement positioning is performed, finally, reflective sheets are measured by an instrument, and tops of the box openings are measured and adjusted; the steel towers are welded through hanging of assembly type hanging baskets after positioned. Accurate lifting of the main towers of the cross-river suspension bridge is realized, curved-surface arc-shaped structure profiles of the tower bodies meet the design requirement, overwater and high-altitude super-tonnage lifting is safe and reliable, and the cost is saved.

Description

One kind is across river only cable suspension rope bridge curved surface arc Construction of Pylon method

Technical field

The present invention relates to one kind is across river only cable suspension rope bridge curved surface arc Construction of Pylon method.

Background technology

Recent year requires more and more higher, urban bridge design to the aesthetic appearance of urban facilities Multiformity and not repeated occurs.And in some large-scale across river suspension bridge Construction of Pylons, do not have The standby condition lifting tower body sections using tower crane, crawler crane, steel pipe support method, hyperboloid simultaneously Arcuate structure moulding is complicated, and manufacture, installation difficulty are big, and construction precision has high demands.

Tower crane method:Only two, the large-tonnage tower crane whole nation, fortune can be lifted at 100 meters at present Big to on-site consolidation place, assembling duration is long, because this bridge all has king-tower for thing two sides, because This could construct another after the completion of must waiting a construction, otherwise will rent two tower cranes, difficult Degree and expense are well imagined.

Crawler crane:Steeper for this bridge east bank bank gradient, and offshore side is farther out, needs to put into Plus large-tonnage tower crane, or fill out river, and one expense super large, its two pairs of natural river environment are made Become broken unreal.

Steel pipe support:Need using substantial amounts of steel pipe, expensive, support is high more than 100 meters, peace Full blast danger is big.

Content of the invention

Its purpose of the present invention is that offer one kind is applied across river only cable suspension rope bridge curved surface arc king-tower Work method it is achieved that in across river suspension bridge water king-tower accurate lifting, tower body curved surface arc tie Structure line style meets design requirement, and waterborne, high-altitude super-tonnage Hoisting Security is reliable, cost-effective.

The technical scheme realized above-mentioned purpose and take, including step

1) hyperboloid arc tower manufactures in factory, and after head tower always spells coupling, disintegrating transportation is to bridge Position;

2) head tower sections is installed, and using crane barge, head tower is lifted, and during crane barge lifting, leads to Cross double hook lifting, just successive step tower body attitude, be slowly promoted to installation site, by head tower section In section case mouth, the matching parts pin joint positioning of setting, realizes the installation of head tower, in installation process, often Interval one section tower body position setting cross-brace, carries out to head tower spacing, prevents head tower lean-in Tiltedly, close up beneficial to head tower;

3) measurement and positioning, finally by apparatus measures reflecting piece, measures to case mouth tip position Adjustment;

4), after the completion of head tower positioning, by hanging assembled Hanging Basket, head tower is welded;

When head tower sections is installed, all first will by the double-hook hoisting of crane barge highly difference in cargo ship The angle of inclination of king-tower sections and pose adjustment are to design attitude, then are hung king-tower sections by crane barge It is transported to design attitude coarse positioning, matching parts is realized by jack and jack and substantially docks, finally By squeezing into steel pin in each matching parts, realize the Dock With Precision Position of mouth under head tower, according to measurement Targeting scheme measures to the three-dimensional coordinate of sections measuring point suitable for reading and the axis of symmetry, adjusts king-tower Under sections, mouth seam is wide, finally realizes the angle of inclination of head tower and plan-position meets design requirement, After the completion of head tower position adjustment, by location-plate, head tower is positioned, start to segmental joints Welding, is finally measured to king-post each point suitable for reading position after the completion of welding and is carried out with design attitude Relatively, record deviation is to instruct follow-up sections to install;

Measurement and positioning adopts total powerstation three-dimensional coordinate method, adopts two TS30 certainly during measurement and positioning The inside and outside side reflector plate of dynamic servo type total powerstation observation tower simultaneously is accurately positioned;By bridge Design coordinate system is converted into coordinate system, and the coordinate system Y-axis of foundation is the bridge axle of this bridge Line, Y-axis coordinate then reflects each section mileage of bridge, and X-axis coordinate then reflects that king-tower deviates bridge axle Line position, Z axis then reflect the absolute altitude of king-tower, and four parameters translate (X0, Y0) two for coordinate system Individual parameter, angle rotation T parameter and scale factor K parameter, according to above-mentioned calculated four This GPS can be controlled the Design of Bridge Coordinate Conversion at all control point in net to this bridge by parameter Coordinate system coordinate, provide field technician use;

Head tower welds, and scene outside girth welding adopts assembled Hanging Basket as jig, pacifies During dress Hanging Basket, lift circular arc wallboard Hanging Basket first, secondly lifting inner side wall plate Hanging Basket, finally hangs Dress outside wallboard Hanging Basket, Hanging Basket is provided with 8 hangers, and wherein 4 hangers are lifted for tower crane Used by Hanging Basket, in addition 4 hangers are used for installing Hanging Basket positioning wire rope, suitable for reading with tower sections hang Ear connects, and Hanging Basket is lifted one by one 1.4 meters of positions to circumferential weld, positioning wire rope on Hanging Basket First length must be regulated, each Hanging Basket has been fastened cable wind rope, Hanging Basket is positioned steel by operating worker Cord is attached with the interim hanger of tower body external surface top, when tower sections outer surface circumferential weld week After the Hanging Basket enclosing all hangs, operating worker pass through head tower outside cat ladder down in Hanging Basket, Ran Houtong Cross cable wind rope, chain block pulls and is interconnected and fixed Hanging Basket split bolt, welder hangs Implement outer side weld gouge back chipping, polishing, welding sequence in basket.

Beneficial effect

Compared with prior art the present invention has advantages below.

1), this engineering head tower is hyperboloid arcuate structure, and each king-post supporting leg divides 10 sections, In factory during Slab element spelling, according to design line style integral assembling on stand, to each king-post Case mouth is mated, and controls king-post line style and matching precision from source, is easy to king-tower lifting Precision controlling;

2), after the overall sleeping spelling on stand of king-tower tower body, adjustment completes case mouth merging precision, Weld matching parts in case mouth position, be attached using steel pin, in present hoisting process, high-altitude After Primary Location, mated steel pin by squeezing into, you can realize accurately mate, positioning;

3), the present invention is lifted using crane barge, can flexibly realize the master of thing two sides Tower replaces lifting construction, more existing Support Method lifting, crawler crane lifting, tower crane hanging method section About hoisting cost;

4), by changing tower body design coordinate system to coordinate system, the independence of foundation is sat Mark system Y-axis is the bridge axle line of this bridge, and Y-axis coordinate then reflects each section mileage of bridge, and X-axis is sat Mark then reflects that king-tower deviates bridge axle line (center line) position, and Z axis then reflect the absolute altitude of king-tower, from And simplify head tower tower body deviation data, it is easy to head tower adjustment;

5), pass through to paste reflecting piece in tower body specified location, using total powerstation, reflecting piece is entered Row positioning measurement, not only achieves the positioning of head tower, also effectively avoids invar tower to slope inwardly When survey crew positioning when personal safety hidden danger.

Brief description

The invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is construction flow chart of the present invention;

Fig. 2 is head tower matching parts scheme of installation in the present invention;

Fig. 3 is head tower lifting schematic diagram in the present invention;

Fig. 4 is head tower temporary support schematic diagram in the present invention;

Fig. 5 is total powerstation three-dimensional localization steel king-tower schematic diagram in the present invention;

Fig. 6 is tower sections scene girth welding Hanging Basket schematic diagram in the present invention;

Fig. 7 is tower sections circumferential weld inner surface weld job schematic diagram in the present invention;

Fig. 8 is A-A sectional view in Fig. 7.

Specific embodiment

As shown in figure 1, inclusion step

1) hyperboloid arc tower manufactures in factory, and after head tower always spells coupling, disintegrating transportation is to bridge Position;

2) head tower sections is installed, and using crane barge, head tower is lifted, and during crane barge lifting, leads to Cross double hook lifting, just successive step tower body attitude, be slowly promoted to installation site, by head tower section In section case mouth, the matching parts pin joint positioning of setting, realizes the installation of head tower, in installation process, often Interval one section tower body position setting cross-brace, carries out to head tower spacing, prevents head tower lean-in Tiltedly, close up beneficial to head tower;

3) measurement and positioning, finally by apparatus measures reflecting piece, measures to case mouth tip position Adjustment;

4), after the completion of head tower positioning, by hanging assembled Hanging Basket, head tower is welded.

Described head tower is always spelled coupling and on assembled moulding bed, head tower is carried out with minute wheel time preassembling, each After the completion of the total spelling of round head tower, matching parts, each sections case are welded to adjacent segment case mouth position 6 Block- matching parts are welded in mouth position, install steel latch in a free state simultaneously, and matching parts is installed After the completion of, remove lower steel latch, carry out head tower sections disintegration.

Suspension centre is welded on tower body, setting 4 on each sections of head tower is hung during described head tower processing Point, modeling determine each sections center of gravity after, by configure the corresponding rope capacity of each suspension centre Lai Ensure that during lifting, steel wire rope and sections center of gravity are in a vertical straight line, thus reaching steel after lifting The pose adjustment that tower can not reach requires.

When head tower sections is installed, all first will by the double-hook hoisting of crane barge highly difference in cargo ship The angle of inclination of king-tower sections and pose adjustment are to design attitude, then are hung king-tower sections by crane barge It is transported to design attitude coarse positioning, matching parts is realized by jack and jack and substantially docks, finally By squeezing into steel pin in each matching parts, realize the Dock With Precision Position of mouth under head tower, according to measurement Targeting scheme measures to the three-dimensional coordinate of sections measuring point suitable for reading and the axis of symmetry, adjusts king-tower Under sections, mouth seam is wide, finally realizes the angle of inclination of head tower and plan-position meets design requirement, After the completion of head tower position adjustment, by location-plate, head tower is positioned, start to segmental joints Welding, is finally measured to king-post each point suitable for reading position after the completion of welding and is carried out with design attitude Relatively, record deviation is to instruct follow-up sections to install.

Measurement and positioning adopts total powerstation three-dimensional coordinate method, adopts two TS30 certainly during measurement and positioning The inside and outside side reflector plate of dynamic servo type total powerstation observation tower simultaneously is accurately positioned;By bridge Design coordinate system is converted into coordinate system, and the coordinate system Y-axis of foundation is the bridge axle of this bridge Line, Y-axis coordinate then reflects each section mileage of bridge, and X-axis coordinate then reflects that king-tower deviates bridge axle Line position, Z axis then reflect the absolute altitude of king-tower, and four parameters translate (X0, Y0) two for coordinate system Individual parameter, angle rotation T parameter and scale factor K parameter, according to above-mentioned calculated four This GPS can be controlled the Design of Bridge Coordinate Conversion at all control point in net to this bridge by parameter Coordinate system coordinate, provide field technician use.

Head tower welds, and scene outside girth welding adopts assembled Hanging Basket as jig, pacifies During dress Hanging Basket, lift circular arc wallboard Hanging Basket first, secondly lifting inner side wall plate Hanging Basket, finally hangs Dress outside wallboard Hanging Basket, Hanging Basket is provided with 8 hangers, and wherein 4 hangers are lifted for tower crane Used by Hanging Basket, in addition 4 hangers are used for installing Hanging Basket positioning wire rope, suitable for reading with tower sections hang Ear connects, and Hanging Basket is lifted one by one 1.4 meters of positions to circumferential weld, positioning wire rope on Hanging Basket First length must be regulated, each Hanging Basket has been fastened cable wind rope, Hanging Basket is positioned steel by operating worker Cord is attached with the interim hanger of tower body external surface top, when tower sections outer surface circumferential weld week After the Hanging Basket enclosing all hangs, operating worker pass through head tower outside cat ladder down in Hanging Basket, Ran Houtong Cross cable wind rope, chain block pulls and is interconnected and fixed Hanging Basket split bolt, welder hangs Implement outer side weld gouge back chipping, polishing, welding sequence in basket.

Embodiment

Controlled for guaranteeing installation line style source, when manufacturing in factory, adopt 1:1 positioning Stand, carries out overall sleeping assembly to head tower tower body, and by checking and accepting, meet after design requirement can be by Tower is transported to bridge location scene.When head tower measures positioning, conventional construction is put using earth coordinates Sample, this measuring method data Gansu Province is long, and it is relevant that instruction deviation data and instrument set station location, increase Head tower high-altitude positioning measurement difficulty.By being calculated using four parameters, earth coordinates are carried out Be converted to coordinate system, simplify head tower measurement data, specify tower body measured deviation direction, real Existing steel body quickly adjusts.Head tower lifting is lifted using crane barge, and it is same that crane barge equipment has double hook When lift advantage, by design head tower hoisting point position, realize head tower lifting raising before, by head tower Attitude is tentatively adjusted in place, and quickly realizes curved surface arcuate structure and installs, crane barge moves twice simultaneously, Realize flexibly alternately lifting of suspension bridge both sides king-tower.Control from the king-tower tower body accuracy of manufacture, water The technological packages such as upper crane barge lifting, spatial attitude positioning are summarized it is achieved that hanging across river The accurate lifting of king-tower in cable bridge water, tower body curved surface arc structure lines type meets design requirement, water Upper, high-altitude super-tonnage Hoisting Security is reliable, cost-effective.

By project study, than selecting and being expounded through peer review, this engineering hyperboloid arc tower is made in factory After making sleeping spelling, disintegrating transportation to bridge location, using crane barge, head tower is lifted.During crane barge lifting, Lifted by crane by double hook, just successive step tower body attitude, be slowly promoted to installation site, by head tower The matching parts pin joint positioning of setting in sections case mouth, realizes the installation of head tower, finally by instrument Measurement reflecting piece, measures adjustment to case mouth tip position.After the completion of head tower positioning, by hanging Assembled Hanging Basket, welds to head tower.In this engineering head tower installation process, at interval of a section Tower body position arranges cross-brace, head tower is carried out spacing, prevents head tower from sloping inwardly, is beneficial to Head tower closes up.

1st, construction technology process

As shown in Figure 1.

2nd, Steel tower fabrication and total spelling

Head tower is produced on factory floor and completes blanking, unit piece assembling, welding;Spell moulding bed total On complete the overall package of head tower sections, welding, finishing, line and fine cut.In assembled moulding bed On head tower carried out with minute wheel time preassembling, control integral linear.It is transported to after the completion for the treatment of painting operation Deposit Liang Chang to be deposited, when bridge location installation needs, water transportation is to bridge location.

According to structure design characteristic it is contemplated that head tower complex structure, weld seam is intensive, melt-through weld More, produced welding deformation and residual stress larger, be control structure welding deformation, protect Card product total quality, Steel tower fabrication adopts " part, part, unit, entirety, preassembling " Mode produces.

In order to ensure bridge location erection precision, determine bridge location reference for installation, install needed for bridge location erection Frock, guarantee that head tower is linear etc., after steel tower column sections whole detection is qualified, enters to head tower sections Row horizontal preassembling fills.Invar tower tower height 100m, is to mate in building site segment lifting order, existing The total spelling in field needs 4 Pin simultaneously carry out simultaneously.And in engineering place limited it is impossible to simultaneously meet make The long stand of 4 Pin 100m, therefore, this engineering head tower is always spelled using point two rounds.

This bridge head tower medial wall line style is the circular curve of radius 380m, therefore, this abutment frame top Absolute altitude circular curve arrangement for 380m according to radius, same stand disclosure satisfy that whole Pin head tower divides The total requirement spelled of two-wheeled.The first round always spells T2~T6 sections, corrects head tower case mouth size, mistake Platform, measurement medial wall arc absolute altitude, check whether it meets design circular curve.Total spelling corrects conjunction After lattice, sections is disintegrated, single segmental carries out sandblasting application.T6 sections is moved to former T2 stand Position, continues the second round and always spells, the assembled T6~T10 sections of the second wheel, and T6 sections is stayed Lower coupling, is for ensureing the coherent of the pre-splicing line style of whole two sections of tower body, beneficial to quality control.

The pre-splicing operation of tower sections continuous coupling is not only realized using the program it is ensured that head tower line style matter Amount.Its short construction period simultaneously, input amount of moulding bed is few, cost-effective.

3rd, matching parts is installed

After the completion of the total spelling of each round head tower, matching parts is welded to adjacent segment case mouth position, such as Shown in Fig. 2.6 Block- matching parts are welded in each sections case mouth position, pacify in a free state simultaneously Steel loading latch.After matching parts installation, remove lower steel latch, carry out head tower sections disintegration.Spray It is transported to bridge location lifting after the completion of sand application.During bridge location lifting, head tower tentatively lifts to design attitude When, drawn by jack, make one group of matching parts complete para-position first, squeeze into steel pin.By falling Chain and jack cooperation, realize other matching parts and tentatively dock, after squeezing into steel pin, you can be quick The accurate docking realizing this case mouth, faulting of slab ends is with total to spell precision consistent.

4th, design of lifting points is installed

King-tower is arc tower, and king-post tilts, head tower totally 50 sections, 8 sections of crossbeam, 6 sections are preced with by tower.For ensureing lifting precision, improve lifting speed, in tower body during head tower processing Upper welding suspension centre, design of lifting points requires to meet lifting requirements for intensity, and suspension centre arrangement meets tower body Preliminary pose adjustment.

4 suspension centres are arranged on each sections of king-tower, after modeling determines each sections center of gravity, by joining Put the corresponding rope capacity of each suspension centre to ensure that during lifting, steel wire rope and sections center of gravity are at one In vertical straight line, thus the pose adjustment that after reaching lifting, head tower can not reach requires.

5th, head tower lifting

When head tower sections is installed, all first will by the double-hook hoisting of crane barge highly difference in cargo ship The angle of inclination of king-tower sections and pose adjustment are to design attitude, then are hung king-tower sections by crane barge It is transported to design attitude coarse positioning, matching parts is realized by jack and jack and substantially docks, finally By squeezing into steel pin in each matching parts, realize the Dock With Precision Position of mouth under head tower.According to measurement Targeting scheme measures to the three-dimensional coordinate of sections measuring point suitable for reading and the axis of symmetry, adjusts king-tower Under sections, mouth seam is wide, finally realizes the angle of inclination of head tower and plan-position meets design requirement. After the completion of head tower position adjustment, by location-plate, head tower is positioned, start to segmental joints Welding.After the completion of welding, king-post each point suitable for reading position is finally measured and carry out with design attitude Relatively, record deviation is to instruct follow-up sections to install.

Setting between T3, T5, T7, T9 sections is needed in king-tower each sections installation process Stull it is ensured that king-tower is linear and king-tower installation process in stablize, these sections need in a pre-installation Temporary weld to reserve ring flange in same position.Stull adopts φ 630mm (δ=10mm) Steel pipe manufactures, and using welding between stull and sections, passes through method between vertical supporting and cross-brace Blue disk is attached, as shown in Figure 3, Figure 4.

6th, head tower measurement and positioning

In order to more intuitively reflect the installation measured deviation of head tower, thus timely and effectively being entangled Partially, this engineering head tower lifting set up independence control networks, will bridge design coordinate system change to The coordinate system that we are set up.The coordinate system Y-axis set up is the bridge axle line of this bridge, Y-axis coordinate then reflects each section mileage of bridge, X-axis coordinate then reflect king-tower deviate bridge axle line (in Line) position, Z axis then reflect the absolute altitude of king-tower.So, in measurement process, instrument reflection Deviation be prolong axis direction around, upper lower deviation, operator can quickly identify tune Perfect square is to thus quickly adjust.And pass through this conversion means, can intuitively recognize steel Tower mounting axis deviation.

The design coordinate system of bridge is changed the coordinate system set up to us, four parameter meters A key technology at last, four parameters are coordinate system translation (X0, Y0) two parameters, angle rotation Turn (T) parameter and scale factor (K) parameter.

The four parameter key points calculating this bridge Coordinate Conversion determine:According to the setting-out of job site place Convenient;Determine YHD1 (YHK0+338.956) and the YHD2 on bridge main line center line (YHK1+231.473) 2 points as four-parameter conversion key point, such as following table:

Table 1 four-parameter conversion key point

Four parameter result of calculations:

This GPS can be controlled all control point in net according to above-mentioned four calculated parameters Design of Bridge Coordinate Conversion, to the coordinate system coordinate of this bridge, provides field technician to make With.

In order to better control over the construction survey precision on bridge top, this secondary control screen cloth is located at former net On the basis of carry out equal accuracy densification network measurement, 4 control point are encrypted in bridge west bank, and bridge east bank adds Close 3 control point, in order to improve certainty of measurement, infilling control point should all be built into pressure and return Heart mark.

Steel tower column locating measurement method is using total powerstation three-dimensional coordinate method, adopts during positioning measurement It is accurately fixed that the inside and outside side reflector plate of two TS30 automatic servo type total powerstations observation tower simultaneously is carried out Position, as shown in Figure 5.

After next section steel skeleton lifting is in place (before not carrying out welding locking), site technology Personnel should carry out repetition measurement to mounted steelframe, and by repetition measurement data in time feed back to design and Monitoring unit, is easy to design and with monitoring unit, pre- inclined parameter computation model is carried out verifying, improves. If repetition measurement data feedback value and predictive value have larger difference, reason should be analyzed and in subsequent construction Process considers suitable regulating measures.

7th, head tower welding

Because head tower segment lifting adopts crane barge to install, cause in the operation of circumferential weld position erecting and welding Platform is highly difficult, and later stage dismantling operation platform all there is great security risk even cannot Remove.For this reason, scene outside girth welding adopts assembled Hanging Basket as jig, such as scheme Shown in 6.

Hanging Basket overall dimensions effective depth 1200mm, wide 1000mm, and outside height is increased 800mm.Hanging Basket chord member adopt ∠ 70*6 angle steel, chord member be directly spaced 600mm setting vertical web rod, Diagonal web member, web member adopts the pipe of φ 42*3, and the Seem Lablab Album stricture of vagina steel plate of 3mm is laid in bottom, outward Side is safeguarded with 0.5mm color steel, and rubber all used by the chord member contacting with head tower wallboard inside Hanging Basket Pad parcel, puts only coating layer outside scratch tower.

When Hanging Basket is installed, lift circular arc wallboard Hanging Basket first, secondly lifting inner side wall plate Hanging Basket, Finally lifting outside wallboard Hanging Basket.8 hangers are provided with Hanging Basket, wherein 4 hangers are tower Hang used by lifting Hanging Basket, in addition 4 hangers are used for installing Hanging Basket positioning wire rope, with tower sections Hanger suitable for reading connects.Hanging Basket is lifted one by one 1.4 meters of positions to circumferential weld, Hanging Basket positions Steel wire rope first must regulate length, and each Hanging Basket has fastened cable wind rope.Operating worker is by Hanging Basket Positioning wire rope is attached with the interim hanger of tower body external surface top, when tower sections outer surface After Hanging Basket around circumferential weld all hangs, operating worker pass through head tower outside cat ladder down in Hanging Basket, Then pulled by cable wind rope, chain block and Hanging Basket split bolt is interconnected and fixed.Weldering Work implements the operations such as outer side weld gouge back chipping, polishing, welding in Hanging Basket.

Tower inner platform adopts, and the manhole on dividing plate, with springboard laying, uses dog between springboard It is connected with each other, as shown in Figure 7, Figure 8.

Tower hat sections girth welding content is mainly angle between wallboard circumferential weld, rib of slab embedding benefit section and wallboard Weld seam, rib of slab are embedding to mend section and the butt weld of rib of slab.Assembling quality to head tower sections before welding Checked comprehensively, physical dimension that the scope of examination includes assembling, groove size and assembly clearance, Cleaning situation of weld seam position and surrounding etc..

Welder first carries out being interrupted positioning welding in each corner location of circumferential weld, and carries out internal circular seam weldering Take bottom, after welding completes internal butt weld, notify crane barge slowly loose hook, crane barge can be installed Next sections.Now, using tower crane, Hanging Basket is installed, carries out remaining outer side weld in Hanging Basket Welding.

Before wallboard, ribbed stiffener plate weld, remove the attachment on wallboard, solder side should keep dry Dry, clean and tidy, forbid directly in rain work, such as need construction operation, necessary protection will be taken Measure.

After the completion of welding, circular seam welding and embedding benefit section floor are carried out with 100% ultrasound wave inspection Survey and 10% X-ray detects.After self-inspection is qualified, third party's detection unit is reported to be sampled Detection, detection ratio is the 30% of self-inspection.

8th, head tower application

After the completion of tower hat lifting, carry out tower hat application.Sections position while welding is preced with by head tower tower, needs to carry out Tower body panel is processed, and then applies priming, intermediate coat and finish paint.Remaining position is preced with to head tower tower, Only need to carry out after superficial stain cleaning to first finish paint, brushing second layer finish paint.Complete this Engineering hyperboloid arc tower is constructed.

Claims (1)

1. one kind is across river only cable suspension rope bridge curved surface arc Construction of Pylon method, including step
1)Hyperboloid arc tower manufactures in factory, and after head tower always spells coupling, disintegrating transportation is to bridge location;
2)Head tower sections is installed, and using crane barge, head tower is lifted, during crane barge lifting, lifted by crane by double hook, just successive step tower body attitude, is slowly promoted to installation site, by the matching parts pin joint positioning of setting in head tower sections case mouth, realize the installation of head tower, in installation process, at interval of a section tower body position setting cross-brace, head tower is carried out spacing, prevent head tower from sloping inwardly, close up beneficial to head tower;
3)Measurement and positioning, finally by apparatus measures reflecting piece, measures adjustment to case mouth tip position;
4)After the completion of head tower positioning, by hanging assembled Hanging Basket, head tower is welded;It is characterized in that,
When head tower sections is installed,Highly different arrive the angle of inclination of king-tower sections and pose adjustment of double-hook hoisting all first passing through crane barge in cargo ship designs attitude,Again king-tower sections is hoisted to by design attitude coarse positioning by crane barge,Realize matching parts by jack and jack substantially to dock,Squeeze into steel pin finally by each matching parts,Realize the Dock With Precision Position of mouth under head tower,According to measurement and positioning scheme, the three-dimensional coordinate of sections measuring point suitable for reading and the axis of symmetry are measured,Under adjustment king-tower sections, mouth seam is wide,Finally realize the angle of inclination of head tower and plan-position meets design requirement,After the completion of head tower position adjustment,By location-plate, head tower is positioned,Start to segmental joints welding,After the completion of welding, king-post each point suitable for reading position is finally measured and be compared with design attitude,Record deviation is to instruct follow-up sections to install;
Measurement and positioning adopts total powerstation three-dimensional coordinate method, is accurately positioned using the inside and outside side reflector plate of two TS30 automatic servo type total powerstations observation tower simultaneously during measurement and positioning;The design coordinate system of bridge is converted into coordinate system, the coordinate system Y-axis set up is the bridge axle line of this bridge, and Y-axis coordinate then reflects each section mileage of bridge, and X-axis coordinate then reflects that king-tower deviates bridge axle line position, Z axis then reflect the absolute altitude of king-tower, and four parameters translate for coordinate system(X0、Y0)Two parameters, angles rotate T parameter and scale factor K parameter, this GPS can control according to above-mentioned four calculated parameters the coordinate system coordinate of the Design of Bridge Coordinate Conversion at all control point in net to this bridge, provide field technician to use;
Head tower welds,Scene outside girth welding adopts assembled Hanging Basket as jig,When Hanging Basket is installed,Lift circular arc wallboard Hanging Basket first,Secondly lifting inner side wall plate Hanging Basket,Finally lifting outside wallboard Hanging Basket,8 hangers are provided with Hanging Basket,Wherein 4 hangers are used by tower crane lifting Hanging Basket,Other 4 hangers are used for installing Hanging Basket positioning wire rope,Hanger suitable for reading with tower sections is connected,Hanging Basket is lifted one by one 1.4 meters of positions to circumferential weld,On Hanging Basket, positioning wire rope must first regulate length,Cable wind rope has been fastened on each Hanging Basket,The interim hanger of Hanging Basket positioning wire rope and tower body external surface top is attached by operating worker,After Hanging Basket around tower sections outer surface circumferential weld all hangs,Operating worker is by cat ladder outside head tower down in Hanging Basket,Then pass through cable wind rope、Chain block pulls and is interconnected and fixed Hanging Basket split bolt,Welder implements outer side weld gouge back chipping in Hanging Basket、Polishing、Welding sequence.
CN201410708019.1A 2014-11-27 2014-11-27 Construction method of curved-surface arc-shaped main towers of cross-river single-cable suspension bridge CN104695333B (en)

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