CN105445181A - Method for measuring friction coefficients of pre-stressed ducts of water-drop-shaped cable saddle of stay cable - Google Patents
Method for measuring friction coefficients of pre-stressed ducts of water-drop-shaped cable saddle of stay cable Download PDFInfo
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- CN105445181A CN105445181A CN201510854761.8A CN201510854761A CN105445181A CN 105445181 A CN105445181 A CN 105445181A CN 201510854761 A CN201510854761 A CN 201510854761A CN 105445181 A CN105445181 A CN 105445181A
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- steel strand
- cable
- duct
- strand wires
- saddle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The invention provides a method for measuring the friction coefficients of pre-stressed ducts of a water-drop-shaped cable saddle of a stay cable. The method is used for measuring the friction coefficients of the pre-stressed ducts of the cable saddle and judging whether sufficient friction force can be provided to guarantee that a cable body does not slip in each cable saddle duct under the action of unbalanced load at two ends of the cable body. The measuring method comprises the following steps: 1) a steel strand is mounted and anchored; 2) the steel strand is pre-tightened; 3) the steel strand is tensioned; 4) a steel strand anchoring system is loosened and unloaded; 5) the measuring process from step 1) to step 4) is repeated for measurement of next duct; 6) the friction coefficients of all the ducts are calculated, and when the friction coefficient of each duct is larger than or equal to the friction coefficient corresponding to the maximum cable force difference of a single steel strand at two ends of a pylon, the steel strand does not slip in the duct under the action of unbalanced cable force.
Description
Technical field
The present invention relates to construction engineering technical field, be specifically related to a kind of method for suspension cable cable saddle prestressed pore passage measuring friction coefficient, mainly the friction factor of droplet-shaped cable saddle prestressed pore passage measured.
Background technology
Cable-stayed bridge is made up of girder, Sarasota and suspension cable three parts, girder generally adopts xoncrete structure, steel and xoncrete structure, unitized construction or steel construction, Sarasota mainly adopts xoncrete structure, suspension cable adopts the steel wire of Materials with High Strength or steel strand wires to make, suspension cable cable saddle is for being connected with Sarasota by steel strand wires, plays a supporting role.Because the cable saddle type adopted is different, the friction force in each duct of its correspondence is also different, cable body two ends are under the effect of unbalanced load, the friction force that each duct can provide enough can not be ensured, the slip of easy generation steel strand wires in duct, therefore needs to carry out frictional force measuring to each duct of same cable saddle.
Summary of the invention
The invention provides a kind of assay method of suspension cable droplet-shaped cable saddle prestress hole road friction coefficient, measure the friction factor of cable saddle prestressed pore passage, can judgement provide enough friction force, and ensure that cable body two ends are under the effect of unbalanced load, cable body slippage does not occur in cable saddle duct.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
An assay method for suspension cable droplet-shaped cable saddle prestress hole road friction coefficient, comprises the steps:
1) anchoring installed by steel strand wires: determine that one end of droplet-shaped cable saddle is stretching end, the other end is stiff end, steel strand wires penetrated the first duct of corresponding suspension cable cable saddle, installs backing plate, sensor, ground tackle and lifting jack successively;
2) steel strand wires pretension: use tensioning equipment to steel strand wires pretension;
4) steel strand tension: install the first mechanics sensor at steel strand tension end, installs the second mechanics sensor at fixed end of steel wire strand, adopts the mode stretch-draw of multistage loadings, and records the first mechanics sensor of every one-level and the numerical value of the second mechanics sensor;
5) loose unloading of steel strand anchoring system: adopt the supporting anchor restorer of lifting jack to move back anchor to anchoring system, after moving back anchor, pine gets intermediate plate, takes off the second mechanics sensor of cushion block and stiff end, withdrawing steel strand wires, completes the test in the first duct;
5) repeat step 1) ~ 4) mensuration process, carry out the test in next duct;
6) calculate the friction factor in all ducts, when the friction factor in duct is more than or equal to friction factor corresponding to design single steel strand Sarasota two end cable force difference maximal value, under the effect of uneven Suo Li, there is not slippage in steel strand wires in this duct.
Further, step 2) in, also need the position adjusting cushion block and stiff end sensor, it is capable and single hole anchor and sensor are remained on the axle center of transverse and longitudinal section of steel strand wires that steel strand wires are in the camber line of suspension cable cable saddle.
Further, step 3) in, the mode stretch-draw of described multistage loadings, its loading is carried out according to 10KN, 20KN, 30KN, 40KN, 50KN, 60KN, 70KN, 80KN, 90KN, 100KN, 110KN, 120KN, 130KN, 140KN, 150KN.
Preferably, after loading reaches 150KN, voltage stabilizing 5min is needed to record test number again.
Preferably, the maximal value of described design single steel strand Suo Li difference is 34.43KN, and corresponding friction factor is 0.37.
From above technical scheme, the present invention is by the steel strand wires in stretching oblique drag-line cable saddle duct step by step, the friction factor in each duct is measured, by comparing with the maximal value of design single steel strand Suo Li difference, ensure that cable body two ends are under the effect of unbalanced load, there is not slippage in cable body in cable saddle duct.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of preferred implementation of the present invention is described in detail.
First make saddle pulling test platform model, the present embodiment, in conjunction with the design of bridge low-pylon cable-stayed bridge in Huaihe River on Huaihe River, has made the rig for model test of the AT250-43ATM droplet-shaped cable saddle of correspondingly-sized.Put on the droplet-shaped oil tube pulling wiping and move back mould agent in the water droplet hole site that each dividing plate of saddle is corresponding, between every two dividing plates, noted grouting material, after grouting material initial set, extract oily tube pulling out, water droplet hole forming, maintenance is to certain intensity.
Its width of the saddle that cable saddle sets up and span make empirical model in strict accordance with the ratio of 1:1, and empirical model is reinforced concrete structure.When saddle model commerical ready-mixed concrete is built to cable saddle bottom level, cable saddle hand-operated gantry frame is adjusted on saddle.The connection of cable saddle and saddle suitably increases reinforcement at weight bearing area.Whole process need prevent and avoid possible collision to cause oily tube pulling to damage.The professional prestressed pore passage inserts of cable saddle part is built, and the gap filling material island in cable saddle between oily tube pulling shakes fully, does not have space or hole.
Then saddle laboratory bench model is used to measure suspension cable cable saddle prestressed pore passage friction factor, adopt monolateral stretch-draw static load anchoring system, use an intelligent tensioning equipment, a 25T lifting jack, one Daepori leads to hydrant cart, 38 6m galvanized strand wires, 38 cover suspension cable single hole anchor devices, 8 pieces of cushion blocks, 250KN sensor two.
1 this assay method is described below by reference to the accompanying drawings:
1) anchoring installed by galvanized strand wires: determine that one end of droplet-shaped cable saddle is stretching end, the other end is stiff end, steel strand wires penetrated the first duct of corresponding suspension cable cable saddle, installs backing plate, sensor, ground tackle and lifting jack successively.
2) steel strand wires pretension: after steel strand anchoring, owing to finding owing to being in lax state after Action of Gravity Field and steel strand wires installation in actual installation, cushion block is easily by related for steel strand wires tenesmus, therefore need to make steel strand wires pretension with tensioning equipment, and according to actual conditions adjustment cushion block and the position of stiff end sensor, ensure on the camber line that steel strand wires are in the cable saddle of design and single hole anchor and sensor are remained on the axle center of transverse and longitudinal section of steel strand wires.
3) steel strand tension: mechanics sensor is shown force value zeroing in the process that instrument prepares, ensure measuring accuracy.During stretch-draw, install the first mechanics sensor at steel strand tension end, install the second mechanics sensor at fixed end of steel wire strand, adopt the mode stretch-draw of multistage loadings, the loading of intelligent tensioning equipment is in slowly uniform state all the time.Load and carry out according to 10KN, 20KN, 30KN, 40KN, 50KN, 60KN, 70KN, 80KN, 90KN, 100KN, and record the first mechanics sensor of every one-level and the numerical value of the second mechanics sensor.After loading reaches 100KN, need voltage stabilizing 5min to record test number again.
4) loose unloading of steel strand anchoring system: adopt the supporting anchor restorer of lifting jack to move back anchor to anchoring system, after moving back anchor, use conventional oil pump truck pine to get intermediate plate, take off the second mechanics sensor of cushion block and stiff end, withdrawing steel strand wires, complete the test in the first duct.
5) repeat step 1) ~ 4) mensuration process, carry out the test in next duct.
6) calculate the friction factor in all ducts, when the friction factor in duct is more than or equal to friction factor corresponding to design single steel strand Sarasota two end cable force difference maximal value, under the effect of uneven Suo Li, there is not slippage in steel strand wires in this duct.
The droplet-shaped cable saddle that the present embodiment adopts has 43 ducts, and in order to improve accuracy, existing measures the friction factor in 6th ~ 43 ducts, and wherein 6th ~ 35 ducts are the duct of not oil-containing tube pulling, and 36th ~ 43 holes are the duct containing the tube pulling of plastic material oil.
Experimental data:
1. without oily tube pulling cable saddle duct calculation of friction coefficient table
As can be seen from this table, without the friction factor in oily tube pulling cable saddle duct at 0.649 ~ 0.672. average friction coefficient u
sand=0.659.
2. oil-containing tube pulling cable saddle duct calculation of friction coefficient table
As can be seen from this table, the friction factor in oil-containing tube pulling cable saddle duct is at 0.22 ~ 0.239. average friction coefficient u
contain=0.231.
The maximal value that the uneven Suo Li of the present embodiment Huaihe River bridge low-pylon cable-stayed bridge designs single steel strand Suo Li difference is 34.43KN, for friction factor u
if=0.37.
By contrast without oily tube pulling cable saddle duct friction factor u
sand, oil-containing tube pulling cable saddle duct friction factor u
containand the friction factor u required under the effect of design unbalanced load
if, learn u
contain<u
if<u
sand.
Embodiment result shows: 1, there is great impact in the arc duct of different medium for the friction factor in steel strand wires and duct; 2, oil-containing tube pulling cable saddle duct, single steel strand provides the friction force value of 25KN, is less than the maximal value 34.43KN of design single steel strand Suo Li difference, under the effect of uneven Suo Li, there is slippage in steel strand wires, therefore the type duct does not meet design requirement in arc duct; 3, without oily tube pulling cable saddle duct, single steel strand can provide the friction force value of 55KN, is greater than the maximal value 34.43KN of design single steel strand Suo Li difference, under the effect of uneven Suo Li, there is not slippage in steel strand wires, therefore the type duct meets design requirement in arc duct.
Be applied to saddle in engineering should adopt and there is good opposing uneven Suo Li difference effect, form drops by high-strength grout and divide threaded pipe type without the high strength grout droplet-shaped saddle system of oily tube pulling cable saddle duct profile.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (5)
1. an assay method for suspension cable droplet-shaped cable saddle prestress hole road friction coefficient, is characterized in that, comprise the steps:
1) anchoring installed by steel strand wires: determine that one end of droplet-shaped cable saddle is stretching end, the other end is stiff end, steel strand wires penetrated the first duct of corresponding suspension cable cable saddle, installs backing plate, sensor, ground tackle and lifting jack successively;
2) steel strand wires pretension: use tensioning equipment to steel strand wires pretension;
4) steel strand tension: install the first mechanics sensor at steel strand tension end, installs the second mechanics sensor at fixed end of steel wire strand, adopts the mode stretch-draw of multistage loadings, and records the first mechanics sensor of every one-level and the numerical value of the second mechanics sensor;
5) loose unloading of steel strand anchoring system: adopt the supporting anchor restorer of lifting jack to move back anchor to anchoring system, after moving back anchor, pine gets intermediate plate, takes off the second mechanics sensor of cushion block and stiff end, withdrawing steel strand wires, completes the test in the first duct;
5) repeat step 1) ~ 4) mensuration process, carry out the test in next duct;
6) calculate the friction factor in all ducts, when the friction factor in duct is more than or equal to friction factor corresponding to design single steel strand Sarasota two end cable force difference maximal value, under the effect of uneven Suo Li, there is not slippage in steel strand wires in this duct.
2. assay method according to claim 1, it is characterized in that, step 2) in, also need the position adjusting cushion block and stiff end sensor, it is capable and single hole anchor and sensor are remained on the axle center of transverse and longitudinal section of steel strand wires that steel strand wires are in the camber line of suspension cable cable saddle.
3. assay method according to claim 1, it is characterized in that, in step 3), the mode stretch-draw of described multistage loadings, its loading is carried out according to 10KN, 20KN, 30KN, 40KN, 50KN, 60KN, 70KN, 80KN, 90KN, 100KN, 110KN, 120KN, 130KN, 140KN, 150KN.
4. assay method according to claim 3, is characterized in that, needs voltage stabilizing 5min to record test number again after loading reaches 150KN.
5. assay method according to claim 1, is characterized in that, the maximal value of described design single steel strand Suo Li difference is 34.43KN, and corresponding friction factor is 0.37.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510854761.8A CN105445181A (en) | 2015-11-25 | 2015-11-25 | Method for measuring friction coefficients of pre-stressed ducts of water-drop-shaped cable saddle of stay cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510854761.8A CN105445181A (en) | 2015-11-25 | 2015-11-25 | Method for measuring friction coefficients of pre-stressed ducts of water-drop-shaped cable saddle of stay cable |
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| CN105445181A true CN105445181A (en) | 2016-03-30 |
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| CN201510854761.8A Pending CN105445181A (en) | 2015-11-25 | 2015-11-25 | Method for measuring friction coefficients of pre-stressed ducts of water-drop-shaped cable saddle of stay cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908378A (en) * | 2017-02-15 | 2017-06-30 | 中国核工业华兴建设有限公司 | A kind of prestress hole road friction coefficient accurate measuring method |
| CN107101764A (en) * | 2017-06-03 | 2017-08-29 | 西南交通大学 | A kind of experimental rig for being used to test main push-towing rope side force |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908378A (en) * | 2017-02-15 | 2017-06-30 | 中国核工业华兴建设有限公司 | A kind of prestress hole road friction coefficient accurate measuring method |
| CN106908378B (en) * | 2017-02-15 | 2019-08-13 | 中国核工业华兴建设有限公司 | A kind of prestress hole road friction coefficient accurate measuring method |
| CN107101764A (en) * | 2017-06-03 | 2017-08-29 | 西南交通大学 | A kind of experimental rig for being used to test main push-towing rope side force |
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Application publication date: 20160330 |