CN109322239A - A kind of design method of pipeline suspension crossing structures under wind system - Google Patents
A kind of design method of pipeline suspension crossing structures under wind system Download PDFInfo
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- CN109322239A CN109322239A CN201811309487.6A CN201811309487A CN109322239A CN 109322239 A CN109322239 A CN 109322239A CN 201811309487 A CN201811309487 A CN 201811309487A CN 109322239 A CN109322239 A CN 109322239A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D18/00—Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- G—PHYSICS
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- G06F30/00—Computer-aided design [CAD]
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
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Abstract
The present invention relates to a kind of pipeline suspension crossing structures under wind System Design methods, comprising: step 1, drafts horizontal wind resistance rope and is conjugated the curve element of rope；Step 2, finite element model and its vibration characteristics are established；Step 3, horizontal wind resistance rope and conjugation rope model are tentatively drafted；Step 4, it determines horizontal wind resistance rope and is conjugated the pretension of rope；Step 5, the scaled model of assembled conduit Cable-stayed wind resistance system and wind tunnel test is carried out, verifies the wind resistance security performance of scaled model under limiting condition；Step 6, final main rope, horizontal wind resistance rope and the Suo Li for being conjugated rope are calculated, and designs satisfactory main rope anchoring pier, conjugation rope anchoring pier and wind rope anchoring pier.The present invention realizes pipeline suspension crossing structure and resists horizontal wind excitation and wind load lift and improve structure laterally and the purpose of vertical rigidity, provides the new mode of one kind for solution aerial crossing pipeline structure wind resistance safety problem under the conditions of Valley.
Description
Technical field
The present invention relates to a kind of pipeline suspension crossing structures under wind System Design methods, belong to oil-gas pipeline overhead crossing engineering and set
Meter field.
Background technique
Pipeline suspension crossing engineering is long oil and gas pipeline across one of most common mode in river, and Cable-stayed has
There is the features such as span ability is strong, the rigidity of structure is small, damping is low, it is extremely sensitive to wind load, it is especially regional in valley river, by
The influence of ravine wind, wind induced structural vibration are one of the aspect that pipeline aerial crossing engineering is paid close attention to the most safely.In previous engineering design, generally
Using the biggish wind resistance cable system of angle with horizontal plane or the biggish bridge deck structure of rigidity is used, but is influenced by Valley,
Conventional wind resistance rope arrangement difficulty is very big, and is limited by the installation of wind resistance rope, cannot provide enough lateral and vertical rigidities, together
The biggish bridge deck structure bring engineering cost of Shi Gangdu is higher.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of pipeline suspension crossing structures under wind System Design sides
Method realizes large span pipeline suspension crossing knot by the way that reasonable horizontal wind resistance rope system (0.3o~1.5o) and conjugation rope system is arranged
The wind resistance safety of structure.The present invention provides one kind newly under the conditions of Valley, to solve aerial crossing pipeline structure wind resistance safety problem
Mode.
The purpose of the present invention is what is be achieved through the following technical solutions:
Pipeline suspension crossing structures under wind system includes:
Two main ropes, every main rope are each passed through the top of two pipeline suspension crossing bridge towers and are in throw in vertical direction
The setting of object line style, the main rope hoist cable that the lower section of two main ropes is arranged in parallel by several have hung pipeline suspension crossing bridge
Face；
Two horizontal wind resistance ropes, parabolically type is arranged in the horizontal direction, and exists with the pipeline suspension crossing bridge floor
It is concordant in horizontal direction, and it is separately positioned on the two sides of the pipeline suspension crossing bridge floor；Two horizontal wind resistance rope difference
The wind drag-line being arranged in parallel by several is connect with the pipeline suspension crossing bridge floor；
It is conjugated rope, is arranged in vertical direction in reversed parabolic type, and the bottom of the pipeline suspension crossing bridge floor is set
Portion；The conjugation Suo Lasuo that the conjugation rope is arranged in parallel by several is connect with the pipeline suspension crossing bridge floor；
Based on above-mentioned pipeline suspension crossing structures under wind system, the design side of the pipeline suspension crossing structures under wind system
Method the following steps are included:
Step 1, the orographic condition according to locating for pipeline suspension crossing structure, the curve for drafting horizontal wind resistance rope and conjugation rope are wanted
Element；
Step 2, it establishes the finite element model of the pipeline suspension crossing structure and calculates the pipeline suspension crossing structure
Vibration characteristics；
Step 3, horizontal wind resistance rope model according to pipeline suspension crossing structure their location calculation of wind speed and is tentatively drafted；Root
It requires tentatively to draft conjugation rope model according to the vertical rigidity of pipeline suspension crossing structure；
Step 4, it is required according to the vibration characteristics of the pipeline suspension crossing structure and the pipeline suspension crossing rigidity of structure true
Fixed horizontal wind resistance rope and the pretension for being conjugated rope；
Step 5, the scaled model of assembled conduit Cable-stayed wind resistance system and carry out scaled model full-bridge wind-tunnel examination
It tests, verifies the wind resistance security performance of the scaled model under limiting condition；If not being able to satisfy wind resistance safety requirements, adjust horizontal anti-
Wind funicular curve and conjugation funicular curve, repeat step 1~step 5；Such as meet wind resistance safety requirements, then carries out step 6；
Step 6, main rope, horizontal wind resistance rope and the Suo Li for being conjugated rope are calculated according to final horizontal wind resistance rope and conjugation rope,
And design the satisfactory main rope anchoring pier of factor against sliding and antidumping buckling safety factor, conjugation rope anchoring pier
Pier is anchored with wind rope, to complete the design of pipeline suspension crossing structures under wind system.
Further, in step 1, the parabola expression formula of the horizontal wind resistance rope and conjugation rope is equal are as follows:
Wherein: y is curve ordinate；X is curvilinear abscissa；H is the value of y as x=l；F is parabola rise；L is
Parabola total span；Horizontal wind resistance rope rise uses the 1/12~1/20 of horizontal wind resistance rope span, and conjugation rope rise is using conjugation
The 1/15~1/30 of rope span.
Further,
When horizontal wind resistance rope or conjugation rope parabola are using being arranged symmetrically, h=0, parabola expression formula are as follows:
When drafting horizontal wind resistance rope and being conjugated the curve element of rope, according to orographic condition locating for pipeline suspension crossing structure,
It is preferential to use the h value with smaller absolute value, it is chosen since h=0.
Further, in step 3, the main rope, horizontal wind resistance rope, conjugation rope, main rope hoist cable, wind drag-line and conjugation rope are drawn
Rope is made of several steel wires, and is drawn in the main rope, horizontal wind resistance rope, conjugation rope, main rope hoist cable, wind drag-line and conjugation rope
The both ends of rope are respectively arranged with anchor head, and the anchor head of the main rope, horizontal wind resistance rope and conjugation rope both ends is all connected with fork ear, the fork
Ear connection anchoring pier anchored end otic placode.
Further, the both ends of the pipeline suspension crossing bridge floor are arranged in main rope anchoring pier；Two main ropes are respectively equipped with
Corresponding main rope dorsal funciculus, the main rope dorsal funciculus are anchored on the main rope anchoring pier；
The both ends of the pipeline suspension crossing bridge floor are respectively equipped with the two horizontal wind resistance rope being arranged symmetrically anchoring piers, are used for
Anchor horizontal wind resistance rope；
The bottom both ends of the pipeline suspension crossing bridge floor are respectively equipped with conjugation rope anchoring pier, for anchoring conjugation rope.
Further, armored concrete gravity type anchoring pier, each design for anchoring pier are all made of to each anchoring pier in step 6
Meet the following conditions simultaneously:
Under the horizontal component effect of corresponding rope system, each pier that anchors is not slid, and the Against Sliding Stability peace of each anchoring pier
Overall coefficient is not less than 1.3；
Under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads, each pier that anchors does not topple, each to anchor the anti-of pier
The buckling safety factor that topples is not less than 1.5；
Under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads, each pier substrate maximum crushing stress that anchors is no more than amendment
1.2 times of groundwork bearing capacity feasible value；
The rope system includes main rope, horizontal wind resistance rope and conjugation rope.
Further, due to gravity, the horizontal wind resistance rope angle with horizontal plane range is between 0.3o~1.5o.
The invention has the benefit that
The present invention provides a kind of complete wind resistance System Design method for pipeline suspension crossing structure, can satisfy suspension cable
The wind resistance of the wind resistance safety requirements of Oil pipeline, the Cable-stayed for being suitable for that low-angle wind rope (0.3o~1.5o) is arranged is set
Meter.By the way that horizontal wind resistance rope and wind drag-line, vertical conjugation rope and conjugation Suo Lasuo is arranged, realizes pipeline suspension crossing structure and support
Anti- horizontal wind excitation and wind load lift and improve structure laterally and vertical rigidity purpose, be Valley under the conditions of, solve
Certainly aerial crossing pipeline structure wind resistance safety problem provides a kind of new mode.
Detailed description of the invention
Fig. 1 is the horizontal wind rope and conjugation bands shape equation curve of pipeline suspension crossing structures under wind system；
Fig. 2 is the limited element calculation model of pipeline suspension crossing structures under wind system；
Fig. 3 is one first order mode of FEM calculation of pipeline suspension crossing structures under wind system；
Fig. 4 is that crucial vibration shape fundamental frequency variation under the conditions of different pretensions of pipeline suspension crossing structures under wind system is shown
It is intended to；
Fig. 5 is pipeline suspension crossing structures under wind system main view of the present invention；
Fig. 6 is pipeline suspension crossing structures under wind system top view of the present invention；
Fig. 7 is horizontal wind resistance rope anchor system schematic diagram；
Fig. 8 is conjugation rope anchor system schematic diagram；
Wherein, the horizontal wind resistance rope of 1-, 2- wind drag-line, 3- are conjugated rope, and 4- is conjugated Suo Lasuo, and the horizontal wind resistance rope of 6- anchors pier,
7- conjugation rope anchoring pier, 8- main rope anchoring pier, 10- main rope dorsal funciculus, 11- main rope, 12- pipeline suspension crossing bridge tower, 13- bridge pier,
14- cushion cap, 15- pipeline suspension crossing bridge floor, the horizontal wind resistance rope anchor system of 21-, 22- are conjugated rope anchor system.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of pipeline suspension crossing structures under wind system, as shown in Figure 5,6, if there are two pipeline suspension crossing bridge tower 12,
The pipeline suspension crossing bridge tower 12 is fixed on bridge pier 13, and cushion cap 14 is equipped with below the bridge pier 13.Two main ropes 11 are distinguished
Across two pipeline suspension crossing bridge towers 12 top and vertical direction parabolically type be arranged, two main ropes 11
Pipeline suspension crossing bridge floor 15 has been hung by several main rope hoist cables being arranged in parallel vertically in lower section.The pipeline suspension crossing bridge
The both ends in face 15 are respectively equipped with main rope anchoring pier 3；Two main ropes 11 are respectively equipped with corresponding main rope dorsal funciculus 10, the main rope dorsal funciculus
10 are anchored on the main rope anchoring pier.
The pipeline suspension crossing structures under wind system further include:
Two horizontal wind resistance ropes 1, in the horizontal direction parabolically type be arranged, and with the pipeline suspension crossing bridge floor 15
It is concordant in the horizontal direction, and it is separately positioned on the two sides of the pipeline suspension crossing bridge floor 15.Due to gravity, the water
Flat 1 angle with horizontal plane range of wind resistance rope can be between 0.3 °~1.5 °.Two horizontal wind resistance ropes 1 pass through several respectively
The wind drag-line 2 of parallel arrangement is connect with the pipeline suspension crossing bridge floor 15.It is drawn by two horizontal wind resistance ropes 1 and several wind
Rope 2, can resist the horizontal direction ant wind load of pipeline suspension crossing structure, and provide the lateral rigidity of pipeline suspension crossing.Institute
The both ends for stating pipeline suspension crossing bridge floor 15 can be respectively equipped with the two horizontal wind resistance rope being arranged symmetrically anchoring piers 6, for anchoring
Horizontal wind resistance rope 1.As shown in fig. 7, being equipped with horizontal wind resistance rope anchor system 21 in horizontal wind resistance rope anchoring pier 6.
It is conjugated rope 3, is arranged in vertical direction in reversed parabolic type, and the pipeline suspension crossing bridge floor 15 is set
Bottom；The conjugation Suo Lasuo 4 that the conjugation rope 3 is arranged in parallel by several is connect with the pipeline suspension crossing bridge floor 15；
By the setting of conjugation rope 3 and several conjugation Suo Lasuo 4, the lift of pipeline suspension crossing wind loads on structure can be resisted, and mention
For the vertical rigidity of pipeline suspension crossing structure.The bottom both ends of the pipeline suspension crossing bridge floor 15 are respectively equipped with conjugation rope anchor
Gu pier 7, for anchoring conjugation rope 3.As shown in figure 8, being equipped with conjugation rope anchor system 22 in the conjugation rope anchoring pier 7.
The design method of the pipeline suspension crossing structures under wind system the following steps are included:
Step 1, the orographic condition according to locating for pipeline suspension crossing structure, the curve for drafting horizontal wind resistance rope and conjugation rope are wanted
Element.
Horizontal wind resistance rope system mainly undertakes horizontal direction wind load and provides vertical rigidity, horizontal wind resistance rope and horizontal plane angle
Control is at 0.3 °~1.5 °, and horizontal wind resistance rope is linear using space parabola, it is contemplated that the installation of horizontal wind resistance rope, wind drag-line is most
Small length is not less than 3m.Conjugation rustling sound owner will provide vertical rigidity, the linear reversed parabola using with horizontal plane
It is linear (linear contrary with main rope).
As shown in Figure 1, the parabola expression formula of the horizontal wind resistance rope and conjugation rope is equal are as follows:
Wherein: y is curve ordinate；X is curvilinear abscissa；H is the value of y as x=l；F is parabola rise；L is
Parabola total span；Horizontal wind resistance rope rise uses the 1/12~1/20 of horizontal wind resistance rope span, and conjugation rope rise is using conjugation
The 1/15~1/30 of rope span.
When horizontal wind resistance rope or conjugation rope parabola are using being arranged symmetrically, h=0, parabola expression formula are as follows:
When drafting horizontal wind resistance rope and being conjugated the curve element of rope, according to orographic condition locating for pipeline suspension crossing structure,
It is preferential to be chosen since h=0 using the h value with smaller absolute value, as far as possible using symmetrical linear (h=0).
Step 2, the finite element model of the pipeline suspension crossing structure is established, as shown in Fig. 2, and to calculate the pipeline outstanding
The vibration characteristics of rope Oil pipeline.
Since the mechanical characteristic of each section in pipeline suspension crossing structure is different, needed in modeling according to their own spy
Property the suitable cell type of selection, by taking common finite element ANSYS as an example, wherein stiffening truss channel steel part uses BEAM44 unit
Simulation is connected by freedom degree release simulation with main rope hoist cable.Bridge tower and stiff girder other parts use BEAM4 unit simulation.
Main rope, main rope hoist cable, horizontal wind resistance rope and wind drag-line use LINK10 unit simulation, and by designating unit set of options, it is
Tension unit.Pipeline uses BEAM4 unit, and pipe support is simulated using MASS21 mass unit.
According to the material property of each component, corresponding material properties are assigned to each structural unit, specific material property is shown in Table
1.In static nonlinear analysis and model analysis, the dead load of structure is only considered.
The material property table of 1 structure of table
It is practical according to pipeline suspension crossing design feature and engineering, choose the constraint of pipeline suspension crossing structural finite element model
Condition is as follows:
1. the anchored end of main rope, horizontal wind resistance rope is by the way of consolidation；
2. the mobile rotation with the face z-y, x-z of frame both ends limitation；
3. bottom consolidates, tower top and main rope are considered by same displacement constraint, using 6 freedom degrees of coupling；
4. main rope is all made of with main rope hoist cable, horizontal wind resistance rope and wind drag-line, main rope hoist cable and truss, wind drag-line and truss
Hingedly.
5. pipeline is secured to pier using consolidation, constrains along the direction that bridge collapses, couple the longitudinal degress of feedom with truss bridge seat.
Taking stiffening truss center is coordinate origin, and coordinate, establishes the position of each key point of full-bridge depending on the relative position.Main rope
Each key point coordinate value presses facade and horizontal plane two sides second-degree parabola by the arrangement input of facade second-degree parabola, horizontal wind resistance rope
Input.According to the design feature of suspension bridge, makees suitably to simplify, establish the finite element model of full-bridge.
Step 3, horizontal wind resistance rope model according to pipeline suspension crossing structure their location calculation of wind speed and is tentatively drafted；Root
It requires tentatively to draft conjugation rope model according to the vertical rigidity of pipeline suspension crossing structure.
Basic wind speed is defined as 100 year return period at the height of 10 meters of the open flat ground in bridge location or more
10min is averaged yearly maximum wind speed, can be according to national basic wind speed value and basic when at spanning position without dependent observation data
Wind speed profile figure determines basic wind speed.
The design checking of pipeline suspension crossing structure upper and lower part structural elements is considered as the effect of wind load.It acts on
Designed wind load on bridge by the equivalent static gust load and the superposition of structure inertia Dynamic Wind Loads under design basis wind speed and
At.Equivalent static gust load is defined as the wind load that equivalent gustiness calculates.It is on the basis of 10 minutes mean wind speeds
Multiplied by an equivalent gustness factor GVIt obtains, which includes the background responses in Wind Loads Acting and fluctuating wind.GVIt is answered in calculating
Consider the influence of the spatial coherence, different roughness of ground surface, different bridge altitude datums of wind.
In the case where cross-bridges aweather acts on, cross force, vertical force and the torque acted in stiff girder unit length is respectively as follows:
In formula, ρ is atmospheric density, VgFor wind speed；CH,CV,CMRespectively the girder that measures of Segment Model dynamometer check is lateral
Force coefficient, vertical force coefficient and torque coefficient；H, B are respectively stiff girder feature height, characteristic width.
The main rope 11, horizontal wind resistance rope 1, conjugation rope 3, main rope hoist cable, wind drag-line 2 and conjugation Suo Lasuo 4 are by several
Root steel wire composition, and in the main rope 11, horizontal wind resistance rope 1, conjugation rope 3, main rope hoist cable, wind drag-line 2 and conjugation Suo Lasuo 4
Both ends are respectively arranged with anchor head；The main rope hoist cable, wind drag-line 2 and be conjugated Suo Lasuo 4 both ends anchor head be separately connected cord clip and
Ear is pitched, for main rope, horizontal wind resistance rope 1 or the connection for being conjugated rope 3 and pipeline suspension crossing bridge floor 15, to realize the transmitting of power.
The anchor head of the main rope, horizontal wind resistance rope and conjugation rope both ends is all connected with fork ear, the fork ear connection anchoring pier anchored end otic placode.
By taking 360m main span suspension crossing engineering as an example, by the horizontal wind resistance rope model for calculating selection are as follows: poly- using hot extrusion
Ethylene parallel steel wire rope is made of the galvanizing coating high tensile steel wire of 151 diameter 5mm, and single cable effective sectional area is 2964mm2,
Nominal fracture load 4951kN.Crowded bilayer PE anti-corrosion outside, PE outer layer color is using red, strength assurance coefficient >=2.50.Rope system
Anchorage uses hot casting anchor, and both ends anchor head is all connected with fork ear, fork ear connection anchoring pier anchored end otic placode.
Conjugation rope is made of the galvanizing coating high tensile steel wire of 73 diameter 5mm, and single cable effective sectional area is 1433mm2, mark
Claim fracture load 2394kN.Crowded bilayer PE anti-corrosion outside, PE outer layer color is using red.Rope system anchorage uses hot casting anchor, both ends anchor
Head is all connected with fork ear, and fork ear is connect with anchoring pier anchored end otic placode.
Step 4, it is required according to the vibration characteristics of the pipeline suspension crossing structure and the pipeline suspension crossing rigidity of structure true
Fixed horizontal wind resistance rope and the pretension for being conjugated rope.
By taking 360m main span suspension crossing engineering as an example, choose corresponding rope lashing power i.e. pretension be respectively 2000KN,
Five kinds of situations of 2500KN, 3000KN, 3500KN, 4000KN are analyzed.
As shown in figs. 34, the vibration characteristics according to the pipeline suspension crossing structure, as horizontal wind resistance rope is opened in advance
Power increases, and pipeline suspension crossing structural key vibration shape fundamental frequency significantly improves, especially larger to torsional frequency increase rate,
Horizontal wind resistance rope is displaced and the vertical displacement of girder is as horizontal wind resistance cable force improves simultaneously.According to analysis using design rope
Power 20% when, pipeline suspension crossing structural key vibration shape fundamental frequency improve it is the most obvious, with horizontal wind resistance cable force after
Continuous to increase, pipeline suspension crossing structural key vibration shape fundamental frequency increase rate is smaller, therefore horizontal wind resistance cable force is used and set
It counts proper when the 20% of Suo Li.
Being conjugated influence of the rope pretension to vertical rigidity has same effect, also according to analysis using the pre- of 200kN
Tension is relatively reasonable.
Step 5, the scaled model of assembled conduit Cable-stayed wind resistance system and carry out scaled model full-bridge wind-tunnel examination
It tests, verifies the wind resistance security performance of the scaled model under limiting condition；If not being able to satisfy wind resistance safety requirements, adjust horizontal anti-
Wind funicular curve and conjugation funicular curve, repeat step 1~step 5；Such as meet wind resistance safety requirements, then carries out step 6.
It for main span 360m suspension crossing wind tunnel test, is carried out in large-sized low-speed return circuit wind tunnel, tests 36 meters of segment length,
22.5 meters wide, 4.5 meters high, wind speed range is 0~16.5m/s, 1.0% or less turbulence level.In view of crossing over overall length and large size
The geometry scaling factor of model is set to CL=1/30, then the long 12m of model main span by the size of low-speed wind tunnel test section, installs model
Air bound degree of the model in wind-tunnel less than 3%, (answer by ordinary circumstance, air bound degree of the model in wind tunnel in wind-tunnel afterwards
Less than 5%).In test, it can use accelerometer or displacement meter carry out the dynamic respond of measurement model.
Obtained according to test result: when incoming flow is uniform flow, air spring pole is under various operating conditions, in test wind speedss
(wind speed is 0~53m/s at real bridge bridge floor height), does not occur the aerodynamic unstability of the amplitudes such as flutter, galloping, quiet wind unstability diverging
Phenomenon；When incoming flow is turbulent flow, air spring pole under various operating conditions, in test wind speedss (at real bridge bridge floor wind speed be about 0~
36m/s), do not occur the aerodynamic unstabilities phenomenons such as flutter and the galloping of amplitude diverging.The various test works in test wind speedss
Under condition, in directions such as lateral, vertical and torsions apparent vortex-induced vibration does not occur for model girder, meets wind resistance safety requirements.
Step 6, main rope, horizontal wind resistance rope and the Suo Li for being conjugated rope are calculated according to final horizontal wind resistance rope and conjugation rope,
And design the satisfactory main rope anchoring pier of factor against sliding and antidumping buckling safety factor, conjugation rope anchoring pier
Pier is anchored with wind rope, to complete the design of pipeline suspension crossing structures under wind system.
Armored concrete gravity type anchoring pier is all made of to each anchoring pier in step 6, is formed by C30 concreting, it is interior
If framework of steel reinforcement and anchor system；The design of each anchoring pier meets the following conditions simultaneously:
Under the horizontal component effect of corresponding rope system pulling force, each pier that anchors is not slid, and the antiskid of each anchoring pier is steady
Dingan County's overall coefficient is not less than 1.3；
Under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads, each pier that anchors does not topple, each to anchor the anti-of pier
The buckling safety factor that topples is not less than 1.5；
Under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads, each pier substrate maximum crushing stress that anchors is no more than amendment
1.2 times of groundwork bearing capacity feasible value.
The rope system includes main rope, horizontal wind resistance rope and conjugation rope.
Pipeline suspension crossing engineering design main span span 360m, southern bank anchor span 109.9m, northern bank anchor span 75.7m, overall length
545.6m.Main rope ratio of rise to span uses 1/10, and horizontal wind resistance rope facade projection span 360m, plane projection beam overall 54.6m, level resist
Wind rope ratio of rise to span uses 1/15.A main rope anchoring pier is respectively arranged with across southern side and north side and two horizontal wind resistance ropes anchor
Pier.Twice are set below bridge deck structure and are conjugated rope, conjugation rope hoist cable range is 290m, and ratio of rise to span uses 1/42, in Nan Anhe
A conjugation rope anchoring pier is respectively arranged in northern bank.
Anchoring pier is arranged altogether and shares 8 for pipeline suspension crossing engineering, and wherein main rope anchors 2, pier, and wind rope anchors 4, pier,
It is conjugated rope and anchors 2, pier.With reference to Fig. 2, southern side is left side main rope anchoring pier using armored concrete gravity type anchoring pier, is used
C30 concrete, if soil layer is uneven, unified lower digging 1m is changed using piece stone concrete and is filled out.Right side main rope anchors pier, two sides water
Flat wind resistance rope anchoring pier and conjugation rope anchoring pier are all made of armored concrete gravity type anchoring pier, using C30 concrete.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of design method of pipeline suspension crossing structures under wind system, which is characterized in that the pipeline suspension crossing structure
Wind resistance system includes:
Two main ropes (11), every main rope (11) are each passed through the top of two pipeline suspension crossing bridge towers (12) and in vertical sides
To parabolically type is arranged, the main rope hoist cable that the lower section of two main ropes (11) is arranged in parallel by several has hung pipeline
Suspension crossing bridge floor (15)；
Two horizontal wind resistance ropes (1), in the horizontal direction parabolically type be arranged, and with the pipeline suspension crossing bridge floor (15)
It is concordant in the horizontal direction, and it is separately positioned on the two sides of the pipeline suspension crossing bridge floor (15)；Two horizontal wind resistances
Rope (1) is connect by the wind drag-line (2) of several parallel arrangements with the pipeline suspension crossing bridge floor (15) respectively；
It is conjugated rope (3), is arranged in vertical direction in reversed parabolic type, and be arranged in the pipeline suspension crossing bridge floor (15)
Bottom；The conjugation Suo Lasuo (4) and the pipeline suspension crossing bridge floor (15) that conjugation rope (3) is arranged in parallel by several
Connection；
The design method of the pipeline suspension crossing structures under wind system the following steps are included:
Step 1, the orographic condition according to locating for pipeline suspension crossing structure drafts horizontal wind resistance rope and is conjugated the curve element of rope；
Step 2, it establishes the finite element model of the pipeline suspension crossing structure and calculates the vibration of the pipeline suspension crossing structure
Dynamic characteristic；
Step 3, horizontal wind resistance rope model according to pipeline suspension crossing structure their location calculation of wind speed and is tentatively drafted；According to pipe
The vertical rigidity of road Cable-stayed requires tentatively to draft conjugation rope model；
Step 4, it requires to determine water according to the vibration characteristics of the pipeline suspension crossing structure and the pipeline suspension crossing rigidity of structure
The pretension of flat wind resistance rope and conjugation rope；
Step 5, the scaled model of assembled conduit Cable-stayed wind resistance system and scaled model full-bridge wind tunnel test is carried out, tested
Demonstrate,prove the wind resistance security performance of the scaled model under limiting condition；If not being able to satisfy wind resistance safety requirements, horizontal wind resistance rope is adjusted
Curve and conjugation funicular curve, repeat step 1~step 5；Such as meet wind resistance safety requirements, then carries out step 6；
Step 6, main rope, horizontal wind resistance rope and the Suo Li for being conjugated rope are calculated according to final horizontal wind resistance rope and conjugation rope, and set
Count the satisfactory main rope anchoring pier of factor against sliding and antidumping buckling safety factor, conjugation rope anchoring pier and wind
Rope anchors pier, to complete the design of pipeline suspension crossing structures under wind system.
2. the design method of pipeline suspension crossing structures under wind system according to claim 1, which is characterized in that step 1
In, the parabola expression formula of the horizontal wind resistance rope and conjugation rope is equal are as follows:
Wherein: y is curve ordinate；X is curvilinear abscissa；H is the value of y as x=l；F is parabola rise；L is parabolic
Line total span；Horizontal wind resistance rope rise use horizontal wind resistance rope span 1/12~1/20, conjugation rope rise using conjugation rope across
The 1/15~1/30 of degree.
3. the design method of pipeline suspension crossing structures under wind system according to claim 2, which is characterized in that
When horizontal wind resistance rope or conjugation rope parabola are using being arranged symmetrically, h=0, parabola expression formula are as follows:
When drafting horizontal wind resistance rope and being conjugated the curve element of rope, according to orographic condition locating for pipeline suspension crossing structure, preferentially
Using the h value with smaller absolute value, chosen since h=0.
4. the design method of pipeline suspension crossing structures under wind system according to claim 1, which is characterized in that step 3
In, the main rope (11), horizontal wind resistance rope (1), conjugation rope (3), main rope hoist cable, wind drag-line (2) and be conjugated Suo Lasuo (4) by
Several steel wires composition, and the main rope (11), horizontal wind resistance rope (1), conjugation rope (3), main rope hoist cable, wind drag-line (2) and
The both ends of conjugation Suo Lasuo (4) are respectively arranged with anchor head, the main rope (11), horizontal wind resistance rope (1) and are conjugated rope (3) both ends
Anchor head is all connected with fork ear, the fork ear connection anchoring pier anchored end otic placode.
5. the design method of pipeline suspension crossing structures under wind system according to claim 1, which is characterized in that
Main rope anchors pier and is arranged at the both ends of the pipeline suspension crossing bridge floor (15)；Two main ropes (11) are respectively equipped with accordingly
Main rope dorsal funciculus (10), the main rope dorsal funciculus (10) are anchored on main rope anchoring pier (8)；
The both ends of the pipeline suspension crossing bridge floor (15) are respectively equipped with the two horizontal wind resistance rope being arranged symmetrically anchorings pier (6),
For anchoring horizontal wind resistance rope (1)；
The bottom both ends of the pipeline suspension crossing bridge floor (15) are respectively equipped with conjugation rope anchoring pier (7), for anchoring conjugation rope
(3)。
6. the design method of pipeline suspension crossing structures under wind system according to claim 5, which is characterized in that step 6
In armored concrete gravity type anchoring pier is all made of to each anchoring pier, each design for anchoring pier meets the following conditions simultaneously:
Under the horizontal component effect of corresponding rope system, each pier that anchors is not slid, and the Against Sliding Stability of each anchoring pier is safely
Number is not less than 1.3；
Under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads, each pier that anchors does not topple, each antidumping for anchoring pier
Buckling safety factor is not less than 1.5；
It is each to anchor pier substrate maximum crushing stress no more than after amendment under corresponding rope system pulling force and corresponding anchoring pier Gravitative Loads
1.2 times of base bearing capacity feasible value；
The rope system includes main rope, horizontal wind resistance rope and conjugation rope.
7. the design method of pipeline suspension crossing structures under wind system according to claim 1, which is characterized in that due to weight
Power effect, horizontal wind resistance rope (1) the angle with horizontal plane range is between 0.3 °~1.5 °.
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| CN112395797A (en) * | 2020-11-27 | 2021-02-23 | 四川石油天然气建设工程有限责任公司 | Oil-gas pipe suspension cable crossing simulation analysis method |
| CN112464534A (en) * | 2020-11-27 | 2021-03-09 | 四川石油天然气建设工程有限责任公司 | Oil-gas pipe suspension cable crossing simulation analysis model and construction method thereof |
| CN113389131A (en) * | 2021-07-26 | 2021-09-14 | 刘顺民 | Three-cable bridge |
| CN114150891A (en) * | 2021-12-30 | 2022-03-08 | 柳州欧维姆工程有限公司 | Inhaul cable replacing method for space cable net supporting structure |
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Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: China Petroleum Pipeline Engineering Co.,Ltd. Applicant after: DESIGN BRANCH OF CHINA PETROLEUM PIPELINE ENGINEERING Corp. Address before: 100120 Beijing Xicheng District six laying Kang Applicant before: China National Petroleum Corp. Applicant before: China Petroleum Pipeline Engineering Co.,Ltd. Applicant before: DESIGN BRANCH OF CHINA PETROLEUM PIPELINE ENGINEERING Corp. |
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