CN104099874B - Using antiskid key as the stretch-draw construction method of the guy of twisted steel cable of locking device - Google Patents
Using antiskid key as the stretch-draw construction method of the guy of twisted steel cable of locking device Download PDFInfo
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Abstract
The invention discloses a kind of stretch-draw construction method of the guy of twisted steel cable using antiskid key as locking device, at every root steel strand when there being the side stretch-draw of antiskid key, nonreactive feather key side also must simultaneous tension, remain in stretching process that the stretching force of nonreactive feather key side is greater than and has antiskid key side stretching force, between the difference of both sides is 1 ~ 2 times of actual measurement frictional resistance; When every root steel strand are having the side stretch-draw of antiskid key to described target stretching rope power f
ctime, first anchoring, then by the side stretch-draw of nonreactive feather key to ultra stretching power f
kdrop to target stretching rope power f again
c, then anchoring, completes the stretching construction of guy of twisted steel cable.Present invention optimizes mounting method, make that the Suo Li of guy of twisted steel cable outside king-post two is identical, antiskid key and king-post closely connected and possess enough reservation for pressure, make every root steel strand identical at the internal force of king-post both sides, improve the degree of safety of whole bundle drag-line, antiskid key coupling mechanism force is more reliable, site operation is conveniently not easy to make mistakes, and ultra stretching power can not cause excessive impact to structural entity.
Description
Technical field
The present invention relates to cable-stayed bridge cable technical field of construction, particularly relate to a kind of stretch-draw construction method of the guy of twisted steel cable using antiskid key as locking device.
Background technology
Wear tower steel strand stay cable and be mainly used in low-pylon cable-stayed bridge.The Objective Concept Frenchman JacguesMathivat of the type bridge proposes, and Japan has built up First low-pylon cable-stayed bridge in the world, and Japan is the country that the type bridge construction is maximum up to now.Domestic from 2000, in succession build up Construction of Wuhu Changjiang River Bridge, Zhangzhou, Fujian war preparedness bridge etc., have accumulated certain design experiences.
Saddle (as shown in Figure 1) is the key constructs of low-pylon cable-stayed bridge king-post, its basic function allows skew drag-line and pass through king-post continuously with continual form, and by anchoring structure, drag-line and king-post are locked, mainly contain double-jacket tube structure and point fiber tube structure.
Wherein, the article " Stay Cables Design of Zhangzhou War Preparation Bridge " being published in " bridge construction " 2002 1 interim discusses relevant double-jacket tube structure (as shown in Figure 2), has found deficiency in the application: 1) because distortion after machining deviation and operation makes saddle internal pipeline be difficult to change; 2) between double-jacket tube, contact surface is narrow and small make pipe under stress concentration phenomenon serious; 3) between double-jacket tube, space is narrow and small makes mud jacking leakiness thus causes body cracking destruction.For overcoming above deficiency, proposing point fiber tube saddle scheme (as shown in Figure 3) and being put to practical application, achieving good effect
But above two kinds are configured in the shortcoming that the design initial stage all exists anti-slide performance deficiency, usually need at king-post outer setting anti-slip anchoring tube (as shown in Figure 4) in large bridge uses, anchorage drum is installed usually before drag-line bears out-of-balance force effect, to overcome uneven Suo Li.Specifically can the interim article " Stay Cables Design of Zhangzhou War Preparation Bridge " of the interim article " Stay Cables Design of Zhangzhou War Preparation Bridge " of bibliography " bridge construction " 2012 4, " bridge construction " 2002 1, the article of the 4th phase in 2013 " railway construction journal " " low-pylon cable-stayed bridge spatial analysis research is protected in Tianjin " and " world's bridge " 2012 5 interim article " Lhasa receive the research of golden bridge bridge tower sections full scale model test ".
But anchorage drum also exposes some problems after a procedure: 1) in cylinder, mortar and exposed steel strand are bonded together, guy system can not carry out the replacing of single steel strand, and economy is not good; 2) out-of-balance force is passed to king-post by the anchor slab of saddle end and makes local, king-post surface region tension by anchorage drum, and the anchoring of anchor slab and king-post exists drawing fatigue effect; 3) under variable action because girder bending-down makes drag-line occur micro-corner at nearly king-post position, anchorage drum limits drag-line and freely rotates, and the anchoring structure of the joint portion of anchorage drum and anchor slab, anchor slab and king-post all will bear flexural fatigue effect.Therefore, scholar is had to advise cancelling the way that also needs to arrange grouting-type anchorage drum beyond saddle with simplified design, construction and later maintenance (can see the article of 2 phases in 2007 " Southeast China University's journal (natural science edition) " " test of low-pylon cable-stayed bridge cable saddle section model and design search ").
Recent year have developed point fiber tube saddle mechanical friction skidding device (as shown in Figure 5) and for real bridge (can see " bridge construction " 2012 the 6 interim article Study and appliance of antiskid key " intersect in low-pylon cable-stayed bridge "), the pattern of employing steel strand one-sided antiskid key lock, bidirectional crossed layout realizes the overall antiskid anchoring of drag-line, its simple structure and can realize the replacing of single steel strand, overcomes the shortcoming of anchorage drum structure.
But adopt the guy of twisted steel cable of antiskid key still to have problems when mounted, this adopts form compression antiskid key (as shown in Figure 6) applying ultra stretching power (ultra stretching coefficient is less than 3%) in one-sided (the nonreactive feather key side) of single steel strand when being configured in construction, the steel strand of half quantity in the whole bundle drag-line of each ultra stretching in the every side of king-post.This method makes every root steel strand different at the internal force of king-post both sides (saddle with antiskid key beyond), and different design safety factors appears in same steel strand.From a certain section of whole bundle drag-line (saddle and antiskid key beyond), the pulling force of every root steel strand is different, and execute-in-place is easily made mistakes, and whether construction monitoring personnel are difficult to define whole Shu Suoli deviation and meet the demands.Therefore, necessary improvement, using antiskid key as the method for stretching of the guy of twisted steel cable of locking device, realizes the optimization in design, construction and monitoring.
Summary of the invention
Because the above-mentioned deficiency of prior art, the present invention proposes one can realize that design, construction and monitoring are upper to be optimized, make that the Suo Li of guy of twisted steel cable outside king-post is identical, antiskid key and king-post closely connected and possess the stretch-draw construction method of the guy of twisted steel cable using antiskid key as locking device of enough reservation for pressure.
For achieving the above object, a kind of stretch-draw construction method of the guy of twisted steel cable using antiskid key as locking device, king-post is equipped with the guy of twisted steel cable using antiskid key as locking device, each root steel strand is provided with primary antibodie feather key, described antiskid key is crisscross arranged on the both sides of king-post, comprises the following steps:
Step one, one-sided ultra stretching power put on does not arrange on the guy of twisted steel cable of antiskid key in nearly king-post side.
The one-sided guy of twisted steel cable of step 2, king-post is at the steel strand of construction stage ultra stretching half quantity respectively.
Step 3, often restraint guy of twisted steel cable when stretch-draw should from be positioned at middle part steel strand, then successively outside.
It is F that step 4, note often restraint guy of twisted steel cable target stretching rope power
c, steel strand quantity is N, then every root steel strand are at the target stretching rope power f of construction stage
c=F
c/ N.
Step 5, often bundle guy of twisted steel cable surveyed coefficient of friction resistance μ before stretch-draw: tested steel twisted wire two ends are installed jack and prepare sensor, one end is set to fixed end, other end stretch-draw is to construction Suo Li, and the rope force rate calculating fixed end and ultra stretching end is worth stretch-draw efficiency factor K, by K=e
-μ θ, in conjunction with recording the accumulative steering angle θ of guy of twisted steel cable in king-post inside, can coefficient of friction resistance μ be obtained.
Step 6, remember that the ultra stretching power of every root steel strand is f
k, then f
k=f
c/ (2K-1).
Step 7, every root steel strand are at nonreactive feather key side pretensioning, and its stretching force need be greater than actual measurement frictional resistance, to ensure that antiskid key is close to cable saddle end face.
Step 8, every root steel strand are when there being the side stretch-draw of antiskid key, and nonreactive feather key side also must simultaneous tension, remain that the stretching force of nonreactive feather key side is greater than and has antiskid key side stretching force in stretching process, between the difference of both sides is 1 ~ 2 times of actual measurement frictional resistance.
Step 9, there iing the side stretch-draw of antiskid key to described target stretching rope power f when every root steel strand
ctime, first anchoring, then by the side stretch-draw of nonreactive feather key to ultra stretching power f
kdrop to target stretching rope power f again
c, then anchoring, completes the stretching construction of guy of twisted steel cable.
Preferably, after completing described step 5, before carrying out described step 6, also be provided with a coefficient of friction resistance and check step: exchange force direction, by fixed end stretch-draw before this, ultra stretching end is fixed, and oppositely measures and show that coefficient of friction resistance μ ' checks, the error of coefficient of friction resistance μ and μ ' is less than 0.01 and performs described step 6, otherwise remeasures coefficient of friction resistance μ and μ '.
Preferably, described step 5 is chosen the coefficient of friction resistance of often restrainting first and second root of guy of twisted steel cable and the actual measurement of last root steel strand and is noted down.
Target of the present invention is to optimize mounting method, make that the Suo Li of guy of twisted steel cable outside king-post is identical, antiskid key and king-post closely connected and possess enough reservation for pressure.Below the theoretical basis of its calculating and key Design method are discussed further in detail:
(1) theoretical basis is calculated
When the effect of guy of twisted steel cable out-of-balance force can be passed to mechanical friction skidding device, every root steel strand cannot reach balance in saddle, namely direction all deviates from out-of-balance force side, and guy of twisted steel cable relies on mechanical friction skidding device place and bears extruding force and just can reach balance.Get mechanical friction skidding device as slider (as shown in Figure 7), its stress can be stated with following formula:
F
a+f
m＝F
be
-μθ(1)
In formula, F
afor Cantilever Construction or the target Suo Li becoming bridge stage steel strand; f
mfor the extruding force that mechanical friction skidding device bears; F
bfor the Suo Li of steel strand ultra stretching end; μ is the coefficient of friction resistance of guy of twisted steel cable in saddle; θ is the accumulative steering angle (rad) of guy of twisted steel cable in king-post inside.
For engineering design, do not wish that the friction skidding device closely connected with anchor slab is drawn out, the standard that is set as follows is to meet design requirement:
f
m≥γ
dΔf(2)
In formula, Δ f is the out-of-balance force effect that guy of twisted steel cable is subject to; γ
dfor design pressure deposit safety factor.
Get friction skidding device as slider, can obtain with reference to formula (1):
F
a+γ
dΔf≤F
be
-μθ(3)
(2) key Design method
Consider to utilize reverse friction power to eliminate the excessive ultra stretching power of guy of twisted steel cable revealed section, control the difference of saddle both sides exit Suo Li to greatest extent and ensure that antiskid key is not drawn out:
1) first will without friction skidding device side ultra stretching to F
k, have friction skidding device side to be stretched to pass line power F
a(F
a<F
k), (reservation for pressure is a and a>=γ to make friction skidding device (i.e. antiskid key) pressurized
dΔ f).
2) pass line power F will be loaded onto without friction skidding device side dumping again
b, then anchoring, utilizes reverse friction power during unloading to retain suitable reservation for pressure (as shown in Figure 8) at friction skidding device place.With reference to formula (3), theoretical model is expressed as formula (4):
F
a+a＝F
ke
-μθ(4)
According to calculating target, saddle is made to export two end cable forces identical, i.e. F
b=F
aand f=0, assuming that the reverse friction when side dumping of guy of twisted steel cable ultra stretching is carried is identical with positive frictional resistance, reservation for pressure can be expressed as formula (5):
a＝F
k(1-e
-μθ)(5)
Bring formula (5) into formula (4) and formula (6) can be obtained:
Formula (5) ~ (6) can according to F
a, μ, θ solve, therefore the method set up of the present invention is feasible.
Now, guy of twisted steel cable is implementing the elongation L of ultra stretching side
bin available Fig. 8, " curve 2 " and horizontal axis surround area divided by guy of twisted steel cable elastic modulus E
swith sectional area A
sand obtain:
Due to friction skidding device still closely connected king-post under live loading (on the left of king-post), the left side Suo Li F in Fig. 8
af cannot be surmounted
ke
-μ θ.And ultra stretching side is subject to positive frictional resistance under live loading affects its Suo Li F
balso F cannot be surmounted
ke
-μ θ.Therefore, the maximum internal force of guy of twisted steel cable in saddle pipeline is F
ke
-μ θ, be also F
a+ a.
The beneficial effect of the stretch-draw construction method of the guy of twisted steel cable using antiskid key as locking device of the present invention is as follows:
1) present invention optimizes mounting method, make that guy of twisted steel cable Suo Li of (saddle is with beyond antiskid key) outside king-post two is identical, antiskid key and king-post closely connected and possess enough reservation for pressure.
2) the invention enables every root steel strand identical at the internal force of king-post both sides (saddle with antiskid key beyond), improve the degree of safety of whole bundle guy of twisted steel cable, antiskid key coupling mechanism force is more reliable, the distortion of guy of twisted steel cable in saddle district is less, guy of twisted steel cable is constant at the maximum internal force in saddle district, therefore there is not fatigue problem.
3) site operation is conveniently not easy to make mistakes, and guy of twisted steel cable is operate thus ultra stretching power to single steel strand to cause excessive impact to structural entity when implementing ultra stretching.
4) the design Suo Li of guy of twisted steel cable revealed section every root steel strand is identical, and construction monitoring personnel are convenient to the Suo Li deviation controlling whole bundle guy of twisted steel cable.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is structure of saddle schematic diagram.
Fig. 2 is double-jacket tube organigram.
Fig. 3 is a point fiber tube organigram.
Fig. 4 is anti-slip anchoring tube organigram.
Fig. 5 is antiskid key organigram.
Fig. 6 is the method for stretching schematic diagram of the guy of twisted steel cable using antiskid key as locking device.
Fig. 7 is mechanical friction skidding device slider force analysis figure.
Fig. 8 is the Suo Li distribution map after ultra stretching end is put.
Fig. 9 is guy of twisted steel cable one-sided ultra stretching power applying method schematic diagram.
Figure 10 is king-post and saddle total structure schematic diagram.
Detailed description of the invention
As shown in Figure 9 and Figure 10, the stretch-draw construction method of a kind of guy of twisted steel cable using antiskid key as locking device of the present embodiment, king-post is equipped with the guy of twisted steel cable using antiskid key as locking device, each root steel strand is provided with primary antibodie feather key, described antiskid key is crisscross arranged on the both sides of king-post, comprises the following steps:
Step one, one-sided ultra stretching power put on does not arrange on the guy of twisted steel cable of antiskid key in nearly king-post side.
The one-sided guy of twisted steel cable of step 2, king-post is at the steel strand of construction stage ultra stretching half quantity respectively.
Step 3, often restraint guy of twisted steel cable when stretch-draw should from be positioned at middle part steel strand, then successively outside.
It is F that step 4, note often restraint guy of twisted steel cable target stretching rope power
c, steel strand quantity is N, then every root steel strand are at the target stretching rope power f of construction stage
c=F
c/ N.
Step 5, often bundle guy of twisted steel cable surveyed coefficient of friction resistance μ before stretch-draw: tested steel twisted wire two ends are installed jack and prepare sensor, one end is set to fixed end, other end stretch-draw is to construction Suo Li, and the rope force rate calculating fixed end and ultra stretching end is worth stretch-draw efficiency factor K, by K=e
-μ θ, in conjunction with recording the accumulative steering angle θ of guy of twisted steel cable in king-post inside, can coefficient of friction resistance μ be obtained; Then force direction is exchanged, by fixed end stretch-draw before this, ultra stretching end is fixed, and oppositely measures and show that coefficient of friction resistance μ ' checks, the error of coefficient of friction resistance μ and μ ' is less than 0.01 and performs described step 6, otherwise remeasures coefficient of friction resistance μ and μ '; Wherein, the coefficient of friction resistance of often restrainting first and second root of guy of twisted steel cable and the actual measurement of last root steel strand can be chosen to note down.
Step 6, remember that the ultra stretching power of every root steel strand is f
k, then f
k=f
c/ (2K-1).
Step 7, every root steel strand are at nonreactive feather key side pretensioning, and its stretching force need be greater than actual measurement frictional resistance, to ensure that antiskid key is close to cable saddle end face.
Step 8, every root steel strand are when there being the side stretch-draw of antiskid key, and nonreactive feather key side also must simultaneous tension, remain that the stretching force of nonreactive feather key side is greater than and has antiskid key side stretching force in stretching process, between the difference of both sides is 1 ~ 2 times of actual measurement frictional resistance.
Step 9, there iing the side stretch-draw of antiskid key to described target stretching rope power f when every root steel strand
ctime, first anchoring, then by the side stretch-draw of nonreactive feather key to ultra stretching power f
kdrop to target stretching rope power f again
c, then anchoring, completes the stretching construction of guy of twisted steel cable.
Concrete, design principles according to the present invention apply on certain bridge the present embodiment using antiskid key the stretch-draw construction method as the guy of twisted steel cable of locking device: the guy of twisted steel cable of this bridge have employed mechanical type friction skidding device (the antiskid key of many steel strand is relative to king-post center line arranged crosswise), and king-post and saddle total structure are as shown in Figure 10.Shown in composition graphs 9, the maximal unbalanced force caused with bridge permanent action and variable action act as according to determining guy of twisted steel cable friction skidding device minimum pressure deposit, ensure that the maximum （normal） stress of guy of twisted steel cable operation phase meets specification and designing requirement, ensure the interim antiskid safety of guy of twisted steel cable in saddle district by the maximum uneven weight of restriction Cantilever Construction.Operation phase unbalanced load have employed full-bridge spatial beam model to carry out loading and solves, and during cantilever construction, maximum permissible unbalance weight is by considering that the FEM (finite element) model of construction overall process solves based on linear superposition theorem.Have employed method of the present invention and calculate the stress of guy of twisted steel cable in saddle district, according to field measurement coefficient of friction resistance data mu=0.06, obtain the result in table 1.
The guy of twisted steel cable in certain Bridge Construction stage of table 1 gathers in the stress in saddle district
Through calculating, guy of twisted steel cable is identical at the Suo Li of king-post both sides (saddle with antiskid key beyond), antiskid key and king-post closely connected and possess enough reservation for pressure, this method reaches predeterminated target.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. one kind using antiskid key as the stretch-draw construction method of the guy of twisted steel cable of locking device, king-post is equipped with the guy of twisted steel cable using antiskid key as locking device, each root steel strand is provided with primary antibodie feather key, described antiskid key is crisscross arranged on the both sides of king-post, it is characterized in that, comprise the following steps:
Step one, one-sided ultra stretching power put on does not arrange on the guy of twisted steel cable of antiskid key in nearly king-post side;
The one-sided guy of twisted steel cable of step 2, king-post is at the steel strand of construction stage ultra stretching half quantity respectively;
Step 3, often restraint guy of twisted steel cable when stretch-draw should from be positioned at middle part steel strand, then successively outside;
It is F that step 4, note often restraint guy of twisted steel cable target stretching rope power
c, steel strand quantity is N, then every root steel strand are at the target stretching rope power f of construction stage
c=F
c/ N;
Step 5, often bundle guy of twisted steel cable surveyed coefficient of friction resistance μ before stretch-draw: tested steel twisted wire two ends are installed jack and prepare sensor, one end is set to fixed end, other end stretch-draw is to construction Suo Li, and the rope force rate calculating fixed end and ultra stretching end is worth stretch-draw efficiency factor K, by K=e
-μ θ, in conjunction with recording the accumulative steering angle θ of guy of twisted steel cable in king-post inside, can coefficient of friction resistance μ be obtained;
Step 6, remember that the ultra stretching power of every root steel strand is f
k, then f
k=f
c/ (2K-1);
Step 7, every root steel strand are at nonreactive feather key side pretensioning, and its stretching force need be greater than actual measurement frictional resistance, to ensure that antiskid key is close to cable saddle end face;
Step 8, every root steel strand are when there being the side stretch-draw of antiskid key, and nonreactive feather key side also must simultaneous tension, remain that the stretching force of nonreactive feather key side is greater than and has antiskid key side stretching force in stretching process, between the difference of both sides is 1 ~ 2 times of actual measurement frictional resistance;
Step 9, there iing the side stretch-draw of antiskid key to described target stretching rope power f when every root steel strand
ctime, first anchoring, then by the side stretch-draw of nonreactive feather key to ultra stretching power f
kdrop to target stretching rope power f again
c, then anchoring, completes the stretching construction of guy of twisted steel cable.
2. as claimed in claim 1 using antiskid key as the stretch-draw construction method of the guy of twisted steel cable of locking device, it is characterized in that: after completing described step 5, before carrying out described step 6, also be provided with a coefficient of friction resistance and check step: exchange force direction, by fixed end stretch-draw before this, ultra stretching end is fixed, and oppositely measures and show that coefficient of friction resistance μ ' checks, the error of coefficient of friction resistance μ and μ ' is less than 0.01 and performs described step 6, otherwise remeasures coefficient of friction resistance μ and μ '.
3. as claimed in claim 1 or 2 using antiskid key as the stretch-draw construction method of the guy of twisted steel cable of locking device, it is characterized in that: described step 5 is chosen the coefficient of friction resistance of often restrainting first and second root of guy of twisted steel cable and the actual measurement of last root steel strand and noted down.
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| CN114657893B (en) * | 2022-04-26 | 2024-06-25 | 中交一公局集团有限公司 | Stay cable single synchronous tensioning device based on space special-shaped |
| CN114934451B (en) * | 2022-05-10 | 2024-05-14 | 柳州欧维姆结构检测技术有限公司 | Dismantling method of steel strand stay cable with steering cable saddle |
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