CN204085828U - The device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection - Google Patents
The device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection Download PDFInfo
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- CN204085828U CN204085828U CN201420194107.XU CN201420194107U CN204085828U CN 204085828 U CN204085828 U CN 204085828U CN 201420194107 U CN201420194107 U CN 201420194107U CN 204085828 U CN204085828 U CN 204085828U
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- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000005622 photoelectricity Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract description 2
- 238000012113 quantitative test Methods 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
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Abstract
The utility model discloses the device of a kind of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection, comprise steel strand wires, weight, displacement meter, steel strand wires lower end hangs weight makes steel strand wires tighten, weight side binding displacement meter.The utility model is mainly used in the method accurately measuring hoist cable/arched bridge pre-stressed boom main arch rib amount of deflection.This measuring method and the device necessary equipment being the test of bridge conventional load used thereof, acquisition cost is low, and decreases measuring technique personnel than use total powerstation, photoelectricity flexometer at the trial, has saved cost; Meanwhile, because the two kinds of surveying instrument precision used all can reach 0.01mm, the main arch rib amount of deflection precision recorded can reach submillimeter level, meets the requirement contrasting quantitative test with calculated value, is beneficial to and grasps bridge technology situation more accurately.
Description
Technical field
The utility model belongs to deck type and half-through hoist cable/arched bridge pre-stressed boom loading test detection technique field, particularly relates to the device of a kind of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection.
Background technology
Hoist cable/suspension rod class arch bridge comprises deck type and half-through arch bridge, is made up of main arch rib, lateral ties and suspension system, and main arch rib majority adopts concrete filled steel tube, and suspension system adopts high strength steel strand or finish rolling reinforcing bar.This type of bridge type can reduce bridge elevation, shorten two ends access bridge length, certainly still have with the same good leap performance of traditional lower bearing arch bridge, arch springing directly can be laid in river course or two sides, valley, centre does not need to arrange bridge pier, especially cross over deep valley, more highlight its cost and technical advantage.Along with the development of Modern Traffic, deck type and the half-through arch bridge of Long span get more and more, and play a part very important in traffic route.For grasping this kind of bridge technology situation, understanding its load-bearing capacity, regularly it is detected very necessary, and loading test is the detection method the most directly judging load carrying capacity of bridge, during test, the amount of deflection of main arch rib is again one of very important basis for estimation, therefore, the amount of deflection of main arch rib be loading test detect must survey parameter.
Measure the conventional instrument and equipment of structural deflection have total powerstation, photoelectricity flexometer, gps system, communicating pipe spirit-leveling instrument, precision level, displacement meter etc.
Deck type and half-through arch bridge are under the trial load effect of equivalent arrangements load, and the amount of deflection of main arch rib is generally little, and hundred meters of arch bridges across footpath, at about 10mm, therefore, require that measuring accuracy reaches submillimeter level.Main total powerstation and the photoelectricity flexometer of using is measured at present, but when using this two kinds of instruments, can only be erected on the ground of stable near bridge site, intervisibility, because bridge is longer, sighting distance is all larger, more mainly accuracy of instrument and measuring error cause arriving submillimeter level, its measurement data to the qualitative judgement of main arch rib deformation tendency still can, but comparatively accurately comparing calculation value to determine quantitative analysis not enough.Use gps system static schema to measure, the test duration is longer, and the time of in most cases testing traffic control does not allow, and accuracy of instrument also cannot reach millimetre-sized requirement still more.Use communicating pipe spirit-leveling instrument to measure, require that reference point and measuring point will be maintained at the same horizontal plane substantially, main arch rib is vertical warp architecture, and the discrepancy in elevation is comparatively large, can not meet this requirement, and communicating pipe spirit-leveling instrument therefore cannot be used to measure its amount of deflection.The measuring accuracy of precision level can reach 0.01mm, meets and measures requirement, but is in high-altitude due to main arch rib major part, and the gradient is very steep, directly cannot set up spirit-leveling instrument on arch ring and measure its amount of deflection.Displacement meter precision (can reach 0.005mm, even higher) equally also meet and measure requirement, but this type of arch bridge is larger with mistake height across footpath, bridge deck structure still more immediately below main arch rib, equally also there is distortion during test, can not set up and require do not have the test bracket be out of shape directly to use displacement meter to measure.
Utility model content
The technical problems to be solved in the utility model be to provide a kind of design science, structure simple, use easily, the device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib that precision is higher and bridge floor Relative Deflection.
For solving the problems of the technologies described above, the utility model is by the following technical solutions: the device accurately measuring hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection, comprise steel strand wires, weight, displacement meter, steel strand wires lower end hangs weight makes steel strand wires tighten, weight side binding displacement meter.
The device of above-mentioned accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection, also comprise tripod, a cartridge clip is fixed in tripod upper end, and cartridge clip entangles steel strand wires.
Steel strand wires nominal diameter is not more than 5.0mm; Weight weight is 8 ~ 12 times of suspention steel strand wires weight, and is not less than 5.0kg.
Steel strand wires nominal diameter is 3.0mm.
Cartridge clip internal diameter 1.0mm larger than steel strand wires diameter.
There is the problems such as practical operation difficulty, measuring accuracy is not enough in the method for traditional measurement hoist cable/arched bridge pre-stressed boom main arch rib amount of deflection, we have established a kind of method of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib amount of deflection.This method utilizes elevation transfer principle, precision level is used to measure bridge floor amount of deflection Δ 2 under trial load effect, use displacement meter to measure the Relative Deflection Δ 1 of bridge floor and main arch rib, recycling geometric relationship formula Δ=Δ 2-Δ 1 accurately calculates the amount of deflection Δ of main arch rib simultaneously.For ease of applying, inventor have also been devised the device of a kind of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection.This measuring method and the device necessary equipment being the test of bridge conventional load used thereof, acquisition cost is low, and decreases measuring technique personnel than use total powerstation, photoelectricity flexometer at the trial, has saved cost; Meanwhile, because the two kinds of surveying instrument precision used all can reach 0.01mm, the main arch rib amount of deflection precision recorded can reach submillimeter level, meets the requirement contrasting quantitative test with calculated value, is beneficial to and grasps bridge technology situation more accurately.
Accompanying drawing explanation
Fig. 1 is that bridge is longitudinally along center line cut-away illustration (totally 7 pairs of hoist cable/suspension rods).
Fig. 2 is bridge lateral cut-away illustration (I-I cut-away illustration).
Fig. 3 is the schematic diagram of the utility model measurement mechanism mounting arrangements.
Fig. 4 is the enlarged diagram of measurement mechanism in Fig. 3.
In figure: 1 main arch rib; Main arch rib after 2 load deflections; 3 bridge deck structures; Bridge deck structure after 4 load deflections; 5 hoist cables/suspension rod; 6 steel strand wires; 7 weights; 8 abuts; 9 columns; 10 tripods; Lateral ties between 11 main arch ribs; 12 hoist cables/suspender sheath; 13 displacement meters; 14 displacement meter pointers; 15 billets; 16 bridge floor amount of deflection measuring points.
Embodiment
Set up the method (Fig. 1 to Fig. 4) accurately measuring hoist cable/arched bridge pre-stressed boom main arch rib amount of deflection
The reference point facilitating measurement of the level buried underground by the ground that <1> is stable near bridge site, preferably arranges two or more, vertical deformation observation system as built in bridge, also can utilize its existing reference point;
<2> suspends steel strand wires in midair at the testing section of main arch rib, and (nominal diameter is not more than 5.0mm, first-selected 3.0mm), steel strand wires lower end hangs a weight, and (weight is 8 ~ 12 times of suspention steel strand wires weight, and be not less than 5.0kg) steel strand wires are tightened, be about 15cm apart from bridge floor bottom weight; In weight side, binding displacement meter (joins acquisition system, precision is not less than 0.01mm, range ability is-50mm ~ 50mm), the billet that the conflict of displacement meter pointer is firmly bonded at bridge floor in level (is of a size of 15cm × 25cm, thickness is 5mm, the parallel bridge in long limit is laterally laid) on, the Relative Deflection Δ 1 of bridge floor and main arch rib when loading in order to measure; In order to stop steel strand wires to shake, arrange on a tripod at bridge floor, a cartridge clip is fixed in tripod upper end, and cartridge clip internal diameter 1.0mm larger than steel strand wires diameter, is entangling steel strand wires from the height of bridge floor about 1.0m.The test of Relative Deflection, can must survey parameter with the another one of loading test---strain shares collector, operates simultaneously, need not increase technician, also not increase workload during test.
<3> is laid with bridge floor deflection observation point on billet, (precision is not less than 0.01mm to use precision level, join foot rest, Sopwith staff and foot pin), load respectively according to second-order levelling standard in test, preferentially select closed path from reference point pilot measurement, twice meter calculates variable quantity (i.e. amount of deflection) Δ 2 of its elevation; Usually this amount of deflection is also the amount of deflection that bridge deck structure must be surveyed at the trial, and data are dual-purpose, do not increase the workload of measurement.
<4>, according to geometric relationship, calculates the amount of deflection Δ=Δ 2-Δ 1 when main arch rib test loads; Δ 1, Δ 2, Δ symbol definition are for just to represent downwarp, and negative indication arches up.
The all amounts of deflection drafted when testing section loads of bridge both sides main arch rib can be tested with method.
Embodiment 1
According to the measuring method of above-mentioned foundation, certain loading test of half-through CFST arch bridge main arch rib spaning middle section is detected.
First before one week at bridge testing, according to second-order levelling standard, stablize near bridge site and on the ground be convenient for measuring, set up the reference point of bridge deck structure measurement of the level, and supposing that the elevation of reference point is 0.
Install measurement mechanism by Fig. 1 to 4, and get out counterweight truck as test with adding loads.
Test ready after, start loading before, according to second-order levelling standard from reference point pilot measurement to bridge floor amount of deflection measuring point, measure preferentially select closed circuit, record its initial elevation H0 (3.55674m); Debug the acquisition system of displacement meter simultaneously, made the zero setting of displacement meter reading.
Then, according to pre-prepd weight, bridge floor is loaded, after bridge structure stabilization, again according to second-order levelling standard from reference point pilot measurement to bridge floor amount of deflection measuring point, measure and preferentially select closed circuit, record the elevation H1 (3.54110m) after its load deflection, Δ 2=H0-H1=3.55674m-3.54110m=0.01564m=15.64mm; Read displacement meter numerical value simultaneously, draw the relative displacement Δ 1 (7.29mm) of main arch rib and bridge deck structure after loading; Again according to geometric relationship formula Δ=Δ 2-Δ 1, calculate the amount of deflection Δ=15.64mm-7.29mm=8.35mm of main arch rib spaning middle section.
Claims (4)
1. accurately measure the device of hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection for one kind, it is characterized in that comprising steel strand wires, weight, displacement meter and tripod, steel strand wires lower end hangs weight makes steel strand wires tighten, weight side binding displacement meter, a cartridge clip is fixed in tripod upper end, and cartridge clip entangles steel strand wires.
2. the device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib according to claim 1 and bridge floor Relative Deflection, is characterized in that: described steel strand wires nominal diameter is not more than 5.0mm; Described weight weight is 8 ~ 12 times of suspention steel strand wires weight, and is not less than 5.0kg.
3. the device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib according to claim 2 and bridge floor Relative Deflection, is characterized in that: described steel strand wires nominal diameter is 3.0mm.
4. the device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib according to claim 3 and bridge floor Relative Deflection, is characterized in that: described cartridge clip internal diameter 1.0mm larger than steel strand wires diameter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194107.XU CN204085828U (en) | 2014-04-21 | 2014-04-21 | The device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection |
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|---|---|---|---|
| CN201420194107.XU CN204085828U (en) | 2014-04-21 | 2014-04-21 | The device of accurate measurement hoist cable/arched bridge pre-stressed boom main arch rib and bridge floor Relative Deflection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940561A (en) * | 2014-04-21 | 2014-07-23 | 广西交通科学研究院 | Method for measuring deflection of main arch rib of sling (rod) arch bridge precisely and device thereof |
| CN108918057A (en) * | 2018-06-13 | 2018-11-30 | 武汉知行建科工程技术有限公司 | Deflection detector and detection method |
| CN111400809A (en) * | 2020-03-31 | 2020-07-10 | 广西交科集团有限公司 | Static force identification method for damage of simply supported beam under uncertain load |
-
2014
- 2014-04-21 CN CN201420194107.XU patent/CN204085828U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940561A (en) * | 2014-04-21 | 2014-07-23 | 广西交通科学研究院 | Method for measuring deflection of main arch rib of sling (rod) arch bridge precisely and device thereof |
| CN108918057A (en) * | 2018-06-13 | 2018-11-30 | 武汉知行建科工程技术有限公司 | Deflection detector and detection method |
| CN108918057B (en) * | 2018-06-13 | 2024-05-24 | 武汉知行建科工程技术有限公司 | Deflection detection device and detection method |
| CN111400809A (en) * | 2020-03-31 | 2020-07-10 | 广西交科集团有限公司 | Static force identification method for damage of simply supported beam under uncertain load |
| CN111400809B (en) * | 2020-03-31 | 2022-06-10 | 广西交科集团有限公司 | Static force identification method for damage of simply supported beam under uncertain load |
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Granted publication date: 20150107 |