CN102168405B - Construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge - Google Patents

Construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge Download PDF

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Publication number
CN102168405B
CN102168405B CN 201110065318 CN201110065318A CN102168405B CN 102168405 B CN102168405 B CN 102168405B CN 201110065318 CN201110065318 CN 201110065318 CN 201110065318 A CN201110065318 A CN 201110065318A CN 102168405 B CN102168405 B CN 102168405B
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China
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anchor box
steel anchor
lift
construction
sections
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CN 201110065318
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Chinese (zh)
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CN102168405A (en
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危接来
杨寿忠
赵志军
潘波
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重庆城建控股(集团)有限责任公司
重庆建工集团股份有限公司
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Priority to CN 201110065318 priority Critical patent/CN102168405B/en
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Abstract

The invention discloses a construction method of a steel-concrete mixed Y-shaped tower of a low-pylon cable-stayed bridge. The invention relates to the construction method of architectural details of a bridge structure, also relates to a lifting device used in the construction method, and aims at solving the problems of waste and the like caused by adoption of a super-tonnage tower crane in the prior art. The construction method comprises the following steps of: manufacturing a segment steel anchor box, and arranging a rod piece support lifting system on a girder at the root part of a pylon of the Y-shaped tower; lifting and fixing the segment steel anchor box by using the rod piece support lifting system, and carrying out concrete construction on the segment steel anchor box after lifting and fixing; and removing the rod piece support lifting system. Compared with the prior art, the rod piece support lifting system is adopted for lifting the steel box girder so that the waste caused by usage of the super-tonnage tower crane is avoided, and the construction method has extremely strong adaptability and flexibility.

Description

Construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge
Technical field
The present invention relates to a kind of construction of bridge construction architectural detail, also relate to the lifting appliance that uses in this engineering method.
Background technology
In Large Span Bridges, the form that its pier (or tower) post mainly adopted in the past is H shape.Along with the development of bridge construction technology, particularly the configuration design of city Very Large Bridge and environmental harmony have become the developing direction of Urban Bridge, and pier (or tower) design at present also might be selected A font, herringbone, Y-shaped, the form of falling the Y-shaped structure.On the one hand, these structures have increased the aesthetic feeling of building, and have also increased on the other hand difficulty of construction.
In at present typical engineering method, the cable stayed bridge steel work adopts the super-tonnage tower crane to lift by crane installation with concrete structure mixing leaning tower more, but the particularity due to lifting appliance, super-tonnage tower crane not only cost is high, and on the market seldom, especially for head tower sections negligible amounts, the head tower that outer dip angle is large adopts many super-tonnage tower cranes just to seem and very wastes.And common mast or gin-pole truck use more generally on the primary structural component lifting construction, and crane capacity is little, is not suitable for work high above the ground.
Summary of the invention
The invention is intended to provide a kind of construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge, to solve the problems such as waste because adopting the super-tonnage tower crane to bring in existing engineering method.
Purpose of the present invention can reach by following measures: the construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge in this programme is characterized in that comprising the following steps:
(1) make the sections steel anchor box, establish simultaneously rod member support Lift-on/Lift-off System on the girder of Y shape tower upper king-post strut root, being manufactured on the steel platform of the member of sections steel anchor box carried out, and the manufacturing of the member of described sections steel anchor box comprises the following steps: in sections steel anchor box body, anchor structure is assorted; Then described anchor structure and sections steel anchor box body and suspension cable sleeve pipe whole assorted carry out the sections steel anchor box assorted in advance on the steel platform;
(2) before the lifting of sections steel anchor box, first rod member support Lift-on/Lift-off System is lifted loading test in advance, the lifting of using described rod member support Lift-on/Lift-off System to carry out the sections steel anchor box is fixed, carry out concrete construction to lifting the sections steel anchor box of fixedly completing, in hoisting process first, after first sections steel anchor box rises and winches to section steel platform calibration position installation in position, the use chain block hangs or the first sections steel anchor box of jack fine setting is accurately located, then measure the axis of first sections steel anchor box, plan-position and elevation, after design and monitored instruction requirement are satisfied in described measurement, locking-typed steel bracket and sections steel anchor box bottom flap are installed,
In the hoisting process of the sections steel anchor box after described lifting first, when lifting N sections steel anchor box, carry out simultaneously being located by connecting between N sections steel anchor box and N-1 sections steel anchor box, when N is odd number, namely carry out the upper king-post strut concrete construction of N-1 sections steel anchor box height, after the lifting of minor details section steel anchor box is fixing, namely carry out the upper king-post strut concrete construction of minor details section steel anchor box height;
(3) dismounting of rod member support Lift-on/Lift-off System.
The characteristics of technique scheme are: different from prior art employing super-tonnage tower crane is to have adopted the rod member support
Lift-on/Lift-off System carries out the lifting of steel case beam, just can built by common universal rod body, waste on the resource of having avoided using the large-tonnage tower crane and having brought, have very strong compliance and flexibility, social and economic effects is obvious, have broad application prospects, be applicable to the short leaning tower construction of cable stayed bridge steel work and concrete structure.
Being manufactured on the steel platform of the member of sections steel anchor box carried out, and the manufacturing of the member of described sections steel anchor box comprises the following steps: in sections steel anchor box body, anchor structure is assorted; Then described anchor structure and sections steel anchor box body and suspension cable sleeve pipe whole assorted carry out the sections steel anchor box assorted in advance on the steel platform.The sections steel anchor box is made in the place of standard can be to guarantee welding quality, particularly thick plates quality and outward appearance physical dimension.Carry out on the steel platform that pre-assembly unit can guarantee that the sections steel anchor box is linear, keyhole exactitude position and total quality.
Before the lifting of sections steel anchor box, first rod member support Lift-on/Lift-off System is lifted loading test in advance.Described pre-lifting loading test can check operability, the stability of rod member support Lift-on/Lift-off System, the reliability of hoist engine brake in rod member support Lift-on/Lift-off System, the balance of load, the safety of suspension centre colligation, the various security factors such as deformation of measuring simultaneously rod member support Lift-on/Lift-off System whether in the scope that design allows, the safety when above-mentioned inspection is confirmed can guarantee formally to use after errorless.
In hoisting process first, after first sections steel anchor box rises and winches to section steel platform calibration position installation in position, the use chain block hangs or the first sections steel anchor box of jack fine setting is accurately located, then measure axis, plan-position and the elevation of first sections steel anchor box, after design and monitored instruction requirement are satisfied in described measurement, locking-typed steel bracket and sections steel anchor box bottom flap are installed;
In the hoisting process of the sections steel anchor box after described lifting first, when lifting N sections steel anchor box, carry out simultaneously being located by connecting between N sections steel anchor box and N-1 sections steel anchor box, when N is odd number, namely carry out the upper king-post strut concrete construction of N-1 sections steel anchor box height, after the lifting of minor details section steel anchor box is fixing, namely carry out the upper king-post strut concrete construction of minor details section steel anchor box height.
Described N is the numbering of sections steel anchor box erection sequence, and described N is since 1 number consecutively.The below illustrates: after the first sections steel anchor box (being first sections steel anchor box) lifting is fixing, lift the second sections steel anchor box and itself and the first sections steel anchor box are located by connecting, then lift the 3rd sections steel anchor box and itself and the second sections steel anchor box are located by connecting, building the Y tower concrete of the second sections steel anchor box height this moment.And then lift fourth, fifth sections steel anchor box and it is located by connecting with third and fourth sections steel anchor box respectively, then build the Y tower concrete of the 4th sections steel anchor box height, by that analogy, carry out at last the concreting of last sections steel anchor box height.
Described technical scheme remains that 1 sections steel anchor box is in the state of not building, so that next sections steel anchor box is installed the effect of starting to control the system guiding, adjusting and being connected the high-strength bolt connection, avoid the concrete of building to cause interference to the accurate location and installation of sections steel anchor box, described concrete construction has comprised the operation of concrete being carried out maintenance.
Further, in described step (2): be provided with stress distribution to drag-line between corresponding upper king-post strut, this feature helps to control upper king-post strut root concrete stress in work progress, reduce the impact of horizontal component, to reduce the deflection of cantilever construction, thereby be convenient to control the upper king-post strut line style, the construction subsidiary stress is controlled in the design allowed band, guarantee structural safety.
Further: described rod member support Lift-on/Lift-off System comprises upstream rod member support and the downstream lever dolly that is located at respectively girder upstream and downstream both sides, two cage rod member supports are laterally respectively established in the upstream and downstream both sides, described upstream rod member support and downstream lever dolly all are connected with the built-in fitting established on the girder of Y shape tower upper king-post strut root, and upstream rod member support, downstream lever dolly and tower seat are in length and breadth to being equipped with the horizontal-associate beam; All respectively be provided with a cover mast Lift-on/Lift-off System on upstream rod member support and downstream lever dolly.The arm of described mast Lift-on/Lift-off System is the four limbs lattice variable cross-section fish belly shape structure that the shaped steel assembly welding becomes, and every cover mast Lift-on/Lift-off System is established a lifting hoist engine and a luffing hoist engine.The characteristics of technique scheme are: the cost that in this programme, the manufacturing of rod member support Lift-on/Lift-off System is used is much lower than the large-tonnage tower crane, and do not need special material and equipment, highly versatile, use universal rod body just can assembly unit to be barricaded as, recyclable reusing, save the cost of whole engineering, be suitable for the short leaning tower construction of Steel concrete structure.
Further: described upstream rod member support and downstream lever dolly are provided with rear cable wind rope, and described rear cable wind rope has been strengthened the resistance to overturning of Lift-on/Lift-off System.
Further: described horizontal-associate beam is provided with rail flat car, is convenient to carry out the transhipment of material on the mast Lift-on/Lift-off System.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the normotopia schematic diagram of Y shape tower in the embodiment of the present invention;
Fig. 2 is the side position schematic diagram of Y shape tower in the embodiment of the present invention.
The specific embodiment
In following proposal, known concrete structure and characteristic are no longer set forth at this, carry out in the steps below.
One, Lift-on/Lift-off System is installed and test
(1) design of rod member support Lift-on/Lift-off System and installation
Lift pylon and mast Lift-on/Lift-off System as depicted in figs. 1 and 2: rod member support Lift-on/Lift-off System is established built-in fitting on 2 No. zero piece spares of girder of Y shape tower upper king-post strut 1 root, adopt universal rod body assembly unit pylon, the upstream and downstream both sides laterally are respectively equipped with upstream rod member support 31 and downstream lever dolly 32, two cage universal stands (as shown in Figure 2) are laterally respectively established in the upstream and downstream both sides, upstream and downstream both sides lifting pylon and tower seat are in length and breadth to being provided with horizontal-associate beam 33, and the horizontal-associate beam of below is provided with rail flat car 34.Pylon overall length 32m, net span are 16m; Lifting pylon height is 34m, and width is 8m.
One cover mast Lift-on/Lift-off System respectively is installed on upstream rod member support 31 and downstream lever dolly 32, is used for lifting and the installation of steel anchor box.Arm 4 adopts four limbs lattice variable cross-section fish belly shape structure, is formed by the shaped steel assembly welding, and its length is 22.6m, and every cover mast Lift-on/Lift-off System is established a lifting hoist engine and a luffing hoist engine, rear cable wind rope 35 is set to strengthen the resistance to overturning of Lift-on/Lift-off System.
The arm design bearing capacity adds 30% impact force by maximum steel anchor box weight to be considered, its intensity, rigidity and stability are calculated and all satisfied the related specifications requirement.
(2) lift in advance loading test
Before first sections steel anchor box lifting, first lift in advance loading test, the scene utilizes reinforcing bar as trial load.Before test, reply rod member support Lift-on/Lift-off System checks comprehensively, then prepares to satisfy the 17t reinforcing bar of trial load loading environment.Lifting test loads and is divided into three grades, is respectively 50%, 100%, 120% and carries out the classification examination and hang.
Before the lifting test, reinforcing bar is tied up in batches, checked its safety, and be transported to the Heave Here.After arm leaves platform 0.2m with the slow lifting of trial load, more slowly fall 4~5 times repeatedly.Check the operability, stability, the reliability of hoist engine brake, the balance of load, the safety of suspension centre colligation of rod member support Lift-on/Lift-off System, measure simultaneously the deformation of universal rod body pylon whether in the scope that design allows; Check whether the suspension arm variable-amplitude angle meets designing requirement, sensitivity, the reliability of the safety guards such as the luffing indicator of arm and various lead limit switches are confirmed can formally use after errorless.
Two, steel anchor box manufacturing
(1) steel anchor box manufacturing
Steel anchor box makes to guarantee welding quality in factory, particularly thick plates quality and outward appearance physical dimension.
(2) steel anchor box is assorted in advance
The pre-assembly unit of all members of steel anchor box and steel anchor box is all carried out on through the flat steel platform of essence, with linear, keyhole exactitude position and the total quality that guarantees steel anchor box.Carry out in three steps:
1. the interior anchor structure of steel anchor box body is assorted;
2. anchor structure and casing and suspension cable sleeve pipe is whole assorted;
3. steel anchor box is assorted.
(3) how much control accuracies of steel anchor box outward appearance
According to single segmental manufacturing and pre-fixing survey achievement, steel anchor box is made how much control accuracies of outward appearance:
The anchor point coordinate of steel anchor box (Δ x, Δ y, Δ z) maximum deviation is less than 5mm;
The pre-assembly unit axis of steel anchor box (comprising longitudinal and transverse axis) deviation is less than 10mm.
Three, steel anchor box lifting and location
(1) preparation is installed
First sections steel anchor box is arranged in the space scope of king-post main reinforcement and steel anchor box WELDING STUDS with regard to bit platform, first sections steel anchor box and concrete joint portion section steel platform in place is installed, and with Y shape tower concrete embedded part firm welding, measure and the first sections steel anchor box of accurate calibration on-station position.Site inspection sections steel anchor box apparent size also meets design requirement and the pre-assembly unit requirement of factory.
(2) steel anchor box lifting
Steel anchor box is transported to the position, Heave Here by land transportation by the rail flat car on the horizontal-associate beam.During the arm lifting, take to establish angle pulley on king-post, utilize the 5t hoist engine on trestle to draw guiding, after making the lifting hawser vertical, the mast Lift-on/Lift-off System is removed the guiding pull rope with the accurate installation in position of steel anchor box.
(3) accurately location and locking of first sections steel anchor box:.
After first sections steel anchor box is lifted to section steel platform calibration position installation in position, using chain block to hang with the first sections steel anchor box of jack fine setting accurately locates, measure axis, plan-position and the elevation of first sections steel anchor box, after checking that satisfied design and monitored instruction require, welding is installed immediately prevents displacement, the locking-typed steel bracket of overturn-preventing and steel anchor box bottom flap.
(4) steel anchor box is in place
1) the sections steel anchor box is in place
End face keyhole contraposition on the adjacent segment steel anchor box, accurately measure steel anchor box axis, plan-position and elevation, use mast Lift-on/Lift-off System, jack fine setting sections steel anchor box accurately to locate, its plane deviation is controlled in 5mm, passes through the high-strength bolt bolt between the steel anchor box of up and down.Adopt the closely connected rate between clearance gauge check joint face, guarantee that it has 〉=50% the closely connected rate of area; In the situation that do not satisfy 50% closely connected rate, adopt stalloy choker block space, to guarantee the closely connected rate designing requirement of area.
After steel anchor box is in place, then carry out repetition measurement one time, if find that there are the phenomenons such as skew in steel anchor box, unclamp high-strength bolt, utilize mast Lift-on/Lift-off System, jack to finely tune, and the filling stalloy, after repeatedly accurately measuring and meeting design requirement, again tighten high-strength bolt.Measure situation according to choker block situation and working control, install to provide to measure for lower sections steel anchor box and control parameter.
2) high-strength bolt connects
Check the high-strength bolt presentation quality when steel anchor box is installed, can use after qualified; High-strength bolt is strictly taken by the length of design code, and its packing ring, nut are strictly taken in accordance with regulations, and notes the positive and negative of packing ring.Only accurately apply torsion on the high-strength bolt nut, execute and twist at the beginning of turning round minute and eventually stubborn two stages carry out.The high-strength bolt that uses constant torque wrench that steel anchor box is connected carries out just twisting, and its moment of torsion is about 50% of construction moment of torsion, adopts the electric twisting spanner to carry out end and twists.
3) erection sequence of steel anchor box
This engineering method steel anchor box is installed and is taked and rope district corresponding king-post section concrete timed delivery arranged for construction, when king-post has the first segment section concrete construction of rope district, after taking lifting to locate 3 sections steel anchor boxes, build the Y tower concrete of front 2 sections steel anchor box height, reserve 1 sections steel anchor box as the initial alignment platform of next cycle installation steel anchor box; Each sections concrete construction of king-post later on after taking first to lift 2 sections steel anchor boxes, then is built 2 sections steel anchor box height Y tower concrete.Remain that 1 sections steel anchor box is in the state of not building, so that next sections steel anchor box is installed the effect of starting to control the system guiding, adjusting and being connected the high-strength bolt connection.
Four, Y tower construction monitoring
(1) for realizing accurate location and the linear control of Y shape tower king-post concrete construction of steel anchor box, control the deflection of king-post cantilever construction, prevent that the inboard concrete of king-post root from larger tensile stress occurring and causing possible cracking, guarantee steel and concrete structure construction quality and safety, must monitor steel anchor box installation and the concrete construction of Y shape tower between implementation period.
(2) cause the elastic deformation of the Y shape tower cantilever construction of having built according to steel anchor box location and king-post concrete construction, template deformation, the impacts such as shrinkage and creep, and sunshine, the temperature difference and working load etc. are controlled parameter, and want structural behavior in conjunction with the bridge main that design document and relevant constructure scheme provide, the construction operating mode, the data such as working load are carried out control analysis, steel anchor box is installed and control parameter and the monitored results of king-post concrete construction in conjunction with measuring, lower sections steel anchor box installation and king-post concrete construction control are proposed necessary adjustment to satisfy the expection after constructing.
Five, king-post template and concreting
(1) king-post template
Y shape king-post upstream and downstream symmetry is carried out, and adopts the bulk typing to turn over mould (punching block) construction technology without support, and every layer of template worn operating platform.The design of template need consider the impact that the Y shape king-post is the factors such as cantilever construction and working load, and its intensity, rigidity and stability should satisfy code requirement.Taked template to grow limit button minor face for " Y " shape tower template, fixed to pull bar is set in length and breadth, the four sides template is coupled to integral body.
For preventing the template flare, taked with die drawing bar inside and outside king-post connect, upstream and downstream king-post template is to the measure such as drawing, and guaranteed safe, the linear and quality of " Y " tower construction.
(2) king-post concrete
1) concrete mix: concrete has the performances such as workability, pumpability and slow setting are early strong, mixes Admixture and reduces the unit cement consumption reduction heat of hydration.
2) concrete casting building technology: during the king-post concrete construction, put in storage by the concrete pump pumping of concrete, layer-by-layer distribution, placement layer by layer, lift height are 40cm, plug-in type and attached vibrator vibration compacting.
3) king-post concrete curing and treatment of construction joints: adopt corresponding curing at moisture-retention and heat-insulation according to weather.Constuction joint adopts the manual method dabbing, uses high pressure water washing.
Six, Y shape tower construction level is to drawing measure
(1) for control upper king-post strut 1 root concrete stress in work progress, king-post is linear and Stability Analysis of Structures, safety, prestressing force must be set to drawing measure when the Y shape tower is constructed.To drawing arranging of prestressed cable to need according to factor analysis calculative determinations such as the deadweight of Y shape tower cantilever construction, working load, designing requirement, construction technology, temperature.
(2) this engineering method is provided with the twice stress distribution to drag-line when " Y " shape tower column structure is constructed.First is below the binding site of upper king-post strut 1 Steel concrete, and second is arranged in the middle part of the Steel concrete combined segment, and drag-line is adopted prestress wire.At upper king-post strut 1 per pass stress distribution, drag-line is arranged four to drag-line, first is 12.5t to every rope pretension of drag-line, amounts to 50t; The second level is 27.5t to every pretension of drag-line, amounts to 110t.Level is not less than 3.5 to the safety coefficient K of drag-line.After construction is complete, carry out the dismounting of hanging device.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; under the prerequisite that does not break away from structure of the present invention; can also make some distortion and improvement; these also should be considered as protection scope of the present invention, and these can not affect effect of the invention process and practical applicability.

Claims (5)

1. construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge is characterized in that comprising the following steps:
(1) make the sections steel anchor box, establish simultaneously rod member support Lift-on/Lift-off System on the girder of Y shape tower upper king-post strut root, being manufactured on the steel platform of the member of sections steel anchor box carried out, and the manufacturing of the member of described sections steel anchor box comprises the following steps: in sections steel anchor box body, anchor structure is assorted; Then described anchor structure and sections steel anchor box body and suspension cable sleeve pipe whole assorted carry out the sections steel anchor box assorted in advance on the steel platform;
(2) before the lifting of sections steel anchor box, first rod member support Lift-on/Lift-off System is lifted loading test in advance, the lifting of using described rod member support Lift-on/Lift-off System to carry out the sections steel anchor box is fixed, carry out concrete construction to lifting the sections steel anchor box of fixedly completing, in hoisting process first, after first sections steel anchor box rises and winches to section steel platform calibration position installation in position, the use chain block hangs or the first sections steel anchor box of jack fine setting is accurately located, then measure the axis of first sections steel anchor box, plan-position and elevation, after design and monitored instruction requirement are satisfied in described measurement, locking-typed steel bracket and sections steel anchor box bottom flap are installed,
In the hoisting process of the sections steel anchor box after described lifting first, when lifting N sections steel anchor box, carry out simultaneously being located by connecting between N sections steel anchor box and N-1 sections steel anchor box, when N is odd number, namely carry out the upper king-post strut concrete construction of N-1 sections steel anchor box height, after the lifting of minor details section steel anchor box is fixing, namely carry out the upper king-post strut concrete construction of minor details section steel anchor box height;
(3) dismounting of rod member support Lift-on/Lift-off System.
2. construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge according to claim 1, is characterized in that in described step (2): be provided with stress distribution to drag-line between corresponding upper king-post strut.
3. construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge according to claim 2, it is characterized in that: described rod member support Lift-on/Lift-off System comprises upstream rod member support and the downstream lever dolly that is located at respectively girder upstream and downstream both sides, two cage rod member supports are laterally respectively established in the upstream and downstream both sides, described upstream rod member support and downstream lever dolly all are connected with the built-in fitting established on the girder of Y shape tower upper king-post strut root, and upstream rod member support, downstream lever dolly and tower seat are in length and breadth to being equipped with the horizontal-associate beam; All respectively be provided with a cover mast Lift-on/Lift-off System on upstream rod member support and downstream lever dolly, the arm of described mast Lift-on/Lift-off System is the four limbs lattice variable cross-section fish belly shape structure that the shaped steel assembly welding becomes, and every cover mast Lift-on/Lift-off System is established a lifting hoist engine and a luffing hoist engine.
4. construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge according to claim 3, it is characterized in that: described upstream rod member support and downstream lever dolly are provided with rear cable wind rope.
5. construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge according to claim 4, it is characterized in that: described horizontal-associate beam is provided with rail flat car.
CN 201110065318 2011-03-18 2011-03-18 Construction method of steel-concrete mixed Y-shaped tower of low-pylon cable-stayed bridge CN102168405B (en)

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