CN104900136A - Cable stayed bridge for test, and mounting method - Google Patents
Cable stayed bridge for test, and mounting method Download PDFInfo
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- CN104900136A CN104900136A CN201510288934.4A CN201510288934A CN104900136A CN 104900136 A CN104900136 A CN 104900136A CN 201510288934 A CN201510288934 A CN 201510288934A CN 104900136 A CN104900136 A CN 104900136A
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000725 suspension Substances 0.000 claims description 112
- 238000004873 anchoring Methods 0.000 claims description 55
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 description 13
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 201000006490 Spondylolysis Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
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- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
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Abstract
The invention relates to the technical field of bridge tests, and especially relates to a cable stayed bridge for tests, and a mounting method. The cable stayed bridge comprises a horizontal main beam, a vertical shear wall and multiple inclined stay cables. Two ends of each inclined stay cable are fixedly anchored to the main beam and the shear wall. Multiple embedded parts are pre-embedded inside the main beam at certain intervals. Each embedded part is detachably connected to a connection plate. The connection plates are fixedly anchored to the inclined stay cables. The test scale, the loading difficulty and the test cost are effectively reduced, the reduced scale proportion of a model can be increased, the bridge is convenient to dismount and assemble, and cable forces can be leveled during a test. During a mounting process, people do not need to damage the main beam structure, the inclined stay cables are effectively preventing from crossing pre-stress pipelines inside the main beam, the overall force bearing of the main beam and the force bearing paths of the inclined stay cables will not be changed, the force bearing performance of the main beam and the inclined stay cables can be truly simulated, and the force bearing performance and the limit force resistance of the inclined stay cables and the main beam after the main beam breaks and stays in a force bearing state can be accurately simulated.
Description
Technical field
The present invention relates to bridge testing technical field, particularly relate to a kind of test cable-stayed bridge and installation method.
Background technology
Cable-stayed bridge has the features such as handsome in appearance, span ability is strong, span setting is flexible and construction interference is few, and has good mechanical property and economic target.Therefore, since the fifties in last century, rapidly, constantly increase across footpath, the development of version more and more tends to diversification in modern cable-stayed bridge development.In order to better study cable-stayed bridge stress performance in testing laboratory, need the stressing conditions of true reduction cable-stayed bridge in testing laboratory.
At present, Cable-stayed Bridge Model test more complicated in scientific research and testing, stress performance is complicated, be mainly bending component, in conventional small scale scale (model) test, generally do half-bridge or full-bridge scaled model, the anchorage style of suspension cable and girder is generally directly anchored at the bottom of the beam of girder, the anchorage style of suspension cable and king-tower is generally directly anchored at above king-tower, the stress performance of the elastic stage of the real bridge of general simulation cable-stayed bridge.For in vast scale scale (model) test, generally do cable-stayed bridge lumbar spondylolysis, the analog form of suspension cable can be divided into several: the stressed of suspension cable is decomposed into horizontal component and vertical force component by (1), horizontal component adopts the simulation of stretch-draw prestressing force steel strand wires, vertical force component and vertical supporting rigidity adopt resiliency supported simulation, therefore without the need to simulating king-tower and suspension cable, only the stressed of girder need be simulated; (2) suspension cable adopts steel strand wires simulation or parallel wire unit simulation, and suspension cable is directly anchored at the back side of king-tower, and suspension cable is anchored at the lower edge of girder, general simulation 1/4 bridge model, therefore need to set up powerful king-tower, and on girder perforate anchoring suspension cable, larger.
Small scale Cable-stayed Bridge Model is tested, its simulation be the elastic force balance performance of cable-stayed bridge system, because size effect is different with the use of material, so the elastic system stress performance that after or cannot being difficult to simulate cracking, suspension cable supports, and the ultimate resistance strength of structural system cannot be learnt.For vast scale cable-stayed bridge scaled model, the stressed employing elastic bearing of suspension cable and tension steel strand simulation, what simulate under the elastic system of girder to a certain extent is stressed, but is difficult to the stress performance after accurate analog girder cracking, and the stress performance of suspension cable after more difficult simulation cracking; In cable-stayed bridge scaled model, suspension cable is directly anchored at king-tower and girder lower edge, needs to set up half-bridge model or 1/4 bridge model, half-bridge model, and overall size and difficulty are too large, and testing expenses are too high; 1/4 bridge model overall size is still very large, and needs to design powerful king-tower, cannot simulate the truly stressed of king-tower; Suspension cable is anchored at girder lower edge, and must be that girder section adopts total cross-section, horizontal scale is not reduced and on girder, perforate need cause damage, test load application and expense not be reduced.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention there is provided a kind of test cable-stayed bridge and installation method, for vast scale scale (model) test, do not change in test Cable stress path, girder entirety stressed, girder do not caused to damage and under suspension cable provides the prerequisite of reliable anchoring, reduce the lateral dimension of model, reduce the vertical and horizontal scale of block mold, reduce the design of test and load difficulty, reduce the spending of testing expenses, more easily can realize elasticity and the rear load-bearing capacity stress test research of cracking of large-scale model.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of test cable-stayed bridge, comprise horizontally disposed girder, the shear wall vertically arranged and multiple skew cables, the two ends of many described suspension cables respectively with described girder and shear wall anchor connection; Become in described girder certain intervals to be embedded with and organizes built-in fitting more, often organize that described built-in fitting is all dismountable is connected with web joint, described web joint and suspension cable anchor connection.
Wherein, described built-in fitting comprises two pre embedded bolts be arranged in parallel, and one end of two described pre embedded bolts is embedded in described girder respectively, and the other end is all connected with described web joint, and described suspension cable is by anchoring piece and described web joint anchor connection;
Wherein, the angle between described pre embedded bolt and girder equals the angle between described suspension cable and girder.
Wherein, the two ends of described web joint are respectively equipped with the connecting hole for being fixedly connected with described pre embedded bolt, and the centre of described web joint is provided with for the anchor hole with described suspension cable anchor connection.
Wherein, be set with the nut of multiple breakout capacity for strengthening described pre embedded bolt outside described pre embedded bolt, described nut is located in described girder.
Wherein, described shear wall is fixed with truss group, the position of described truss group is higher than the position of described girder; Described suspension cable is by described truss group and described shear wall anchor connection.
Wherein, described truss group comprises column, anchoring tooth block and two groups of supporting constructions, and one end of described supporting construction is fixed on described shear wall, and the other end is fixedly connected with by described column, described anchoring tooth block is installed on described column, for suspension cable described in anchor connection.
Wherein, described suspension cable is by ground tackle and the anchor connection of described anchoring tooth block; The rope meter for monitoring described suspension cable anchoring status is also provided with between described ground tackle and anchoring tooth block.
Wherein, described supporting construction comprises the first boom, the second boom and the 3rd boom, and one end of described first boom and the second boom is parallel to be respectively fixed on described shear wall, and respectively perpendicular to described shear wall, the other end is fixedly connected with by described column; One end that described second boom is fixed with column is fixedly connected with shear wall by described 3rd boom; Angled setting between described 3rd boom and described shear wall.
Wherein, described suspension cable is steel strand wires, and quantity is 1 ~ 3; The cross section of described girder is T-shaped, and the cross section of described first boom, the second boom and the 3rd boom is enclosing square cross section; The grade of described pre embedded bolt is 8.8 ~ 12.9 grades, and quantity is two, and diameter specifications is M20 ~ M36; The material of described web joint is steel, and thickness is 30 ~ 50mm, and quantity is identical with the quantity of described suspension cable; Described anchoring piece is the anchoring of P type; The material of described anchoring tooth block is steel, and coupling part thickness is 20 ~ 30mm; Described ground tackle is 1 ~ 3 hole; The dynamometry scope of described rope meter is 20t ~ 100t.
Present invention also offers a kind of installation method tested with cable-stayed bridge, comprise the following steps:
S1, in girder inner position bury pre embedded bolt in advance;
S2, on shear wall assembled truss group;
S3, blanking is carried out to the length of suspension cable, and sleeve extruding is carried out to its lower end, connection anchoring element;
S4, in plane and locus, relative positioning is carried out to described girder, and the axial Compact Mounts of anchoring and horizontal limit devices, described girder is arranged on level ground by resiliency supported;
S5, described anchoring piece described suspension cable is equipped with one end through the anchor hole of web joint, the other end is provided with pad, rope meter, pad and ground tackle successively, is then anchored in described truss group.
S6, by the position of one end traction to the pre embedded bolt on described girder being installed with described web joint of described suspension cable, a nut on each cover on two described pre embedded bolts, after described pre embedded bolt is each passed through the connecting hole on described web joint, undertaken connecting, tightening and leveling by described nut.
S7, in described truss group, carry out stretch-draw pretension by suspension cable described in jack pair, make described suspension cable and girder form rigidity system.
(3) beneficial effect
Technique scheme of the present invention has following beneficial effect:
(1) a kind of test cable-stayed bridge of the present invention utilizes shear wall to replace king-tower structure, with girder by suspension cable anchor connection, while making girder section laterally can reduce half, powerful especially without the need to by king-tower structural design, effectively can realize the reliable anchoring of suspension cable, reduce the scale of test, load difficulty and testing expenses, and the reduced scale of model can be increased.
(2) in girder, become certain intervals to be embedded with and organize built-in fitting more, often built-in fitting is all dismountable is connected with web joint for group, web joint and suspension cable anchor connection, without the need to damaging main beam structure, can effectively avoid suspension cable to intersect with the prestress pipe in girder, and the stressed and suspension cable of the entirety not changing girder by power path.
(3) girder adopts resiliency supported, can real simulation girder and the stress performance of suspension cable under elastic force balance state preferably, also can simulate the girder cracking stress performance of suspension cable and girder and ultimate resistance strength under stress afterwards comparatively accurately.
(4) web joint and the dismountable connection of pre embedded bolt, makes this test cable-stayed bridge to carry out easily dismantling and assembling, is beneficial to the levelling of Suo Li in test.
Accompanying drawing explanation
Fig. 1 is the front view of the test cable-stayed bridge of the embodiment of the present invention;
Fig. 2 be Fig. 1 A to cut-open view;
Fig. 3 is the front view of the truss group of the embodiment of the present invention;
Fig. 4 be Fig. 3 B to cut-open view;
Fig. 5 is the front view of the web joint of the embodiment of the present invention;
Fig. 6 is the vertical view of the web joint of the embodiment of the present invention.
Wherein, 1, suspension cable; 2, girder; 3, pre embedded bolt; 4, truss group; 5, shear wall; 6, the first bolt; 7, web joint; 8, anchoring piece; 9, nut; 10, prestress tube bank; 11, rope meter; 12, ground tackle; 13, pad; 14, the first boom; 15, column; 16, the second boom; 17, the 3rd boom; 18, the second bolt; 19, anchoring tooth block; 20, anchor hole; 21, connecting hole.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
In describing the invention, except as otherwise noted, the implication of " multiple " is two or more; Except as otherwise noted, the implication of " nick shaped " is the shape except cross section is concordant.Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
As shown in Figure 1, a kind of test cable-stayed bridge of the present embodiment comprises horizontally disposed girder 2, the shear wall 5 vertically arranged and multiple skew cables 1, the two ends of multiple skew cables 1 respectively with girder 2 and shear wall 5 anchor connection, utilize shear wall 5 to replace king-tower structure.The suspension cable 1 of the present embodiment is steel strand wires, quantity is 1 ~ 3, the cross section of girder 2 is T-shaped, while making the cross section of girder 2 laterally can reduce half, powerful especially without the need to by king-tower structural design, effectively can realize the reliable anchoring of suspension cable 1, reduce the scale of test, load difficulty and testing expenses, and the reduced scale of model can be increased.The two ends of girder 2 adopt resiliency supported to stand on level ground, can real simulation girder 2 and the stress performance of suspension cable 1 under elastic force balance state preferably, also can simulate comparatively accurately girder 2 ftracture after the stress performance of suspension cable 1 and girder 2 and ultimate resistance strength under stress.
In the test cable-stayed bridge of the present embodiment, the anchor structure of suspension cable 1 respectively and between shear wall 5 and girder 2 can be divided into upper end anchor structure and anchoring lower ends structure.
Anchoring lower ends structure is the anchor structure between suspension cable 1 and girder 2.In the present embodiment, become certain intervals to be embedded with and to organize built-in fitting more in girder 2, often built-in fitting is all dismountable is connected with web joint 7, web joint 7 and suspension cable 1 anchor connection for group.Many prestress tube banks 10 are embedded with vertically in girder 2, built-in fitting be arranged so that suspension cable 1 is installed time without the need to damaging girder 2 structure, can effectively avoid suspension cable 1 and the prestress in girder 2 to restrain 10 to intersect, and the stressed and suspension cable 1 of the entirety not changing girder 2 by power path; Dismountablely between built-in fitting with web joint 7 to be connected, to make this test cable-stayed bridge to carry out easily dismantling and assembling, be beneficial to the levelling of Suo Li in test.
As shown in Figure 2, in order to ensure often to organize the stable connection between built-in fitting and web joint 7, built-in fitting is preferably two pre embedded bolts be arranged in parallel 3, Fig. 2 for shown in Fig. 1 with the pre embedded bolt 3 place plane A that is section to cut-open view, the grade of pre embedded bolt 3 is preferably 8.8 ~ 12.9 grades, quantity is two, and diameter specifications is M20 ~ M36; One end of two pre embedded bolts 3 is embedded in girder 2 respectively, and the other end is all connected with web joint 7, and suspension cable 1 is by anchoring piece 8 and web joint 7 anchor connection, and the material of web joint 7 is steel, and thickness is 30 ~ 50mm, and quantity is identical with the quantity of suspension cable 1; Anchoring piece 8 is preferably the anchoring of P type, is convenient to the connection of suspension cable 1 and pre embedded bolt 3.
As shown in Figure 5, Figure 6, the two ends of web joint 7 are respectively equipped with the connecting hole 21 for being fixedly connected with pre embedded bolt 3, the centre of web joint 7 is provided with for the anchor hole 20 with suspension cable 1 anchor connection, anchor hole 20 preferably diameter is 17mm, during anchoring, one end of suspension cable 1 is through after the anchor hole 20 on web joint 7, is anchored on suspension cable 1 by anchoring piece 8 by web joint 7; Meanwhile, two pre embedded bolts 3 are each passed through the connecting hole 21 at web joint 7 two ends, utilize pre embedded bolt 3 to be fixedly connected with pre embedded bolt 3 by web joint 7 with coordinating of nut 9, thus achieve the anchor connection of pre embedded bolt 3 and suspension cable 1; Cooperation between pre embedded bolt 3 and web joint 7 can be dismantled and assemble, and makes suspension cable 1 at the trial can assembly and disassembly easily, is beneficial to the levelling of Suo Li in test.
In order to strengthen the breakout capacity of pre embedded bolt 3, the part be embedded in outside pre embedded bolt 3 in girder 2 is also set with multiple nut 9.
Angle between preferred pre embedded bolt 3 and girder 2 equals the angle between suspension cable 1 and girder 2, then the vertical displacement of process of the test middle girder 2, the relative rotation of girder 2 and the cable sag effect of suspension cable 1 is considered, can effectively avoid suspension cable 1 and prestress tube bank 10 intersect, cause damage without the need to carrying out perforate on girder 2.
The pre-buried angle of pre embedded bolt 3, on the basis identical with the angle of suspension cable 1, considers the displacement of girder 2, the cable sag effect of suspension cable 1 and the relative rotation of girder 2 and carries out pre embedded bolt 3 and revise.
The lower anchor structure of this suspension cable 1 can be mounted and dismounted by nut 9 easily, be applicable to very much the Experiment of Mechanical Behavior of the bad domestic simulation vast scale cable-stayed bridge scaled model member structure of testing laboratory, by turned crane coordinating operation that is artificial and testing laboratory, can easily can carry out large complicated rope girder construction test.
Upper end anchor structure is the anchor structure between suspension cable 1 and shear wall 5.In the present embodiment, shear wall 5 is fixed with truss group 4 by the first bolt 6, as shown in Figure 3, Figure 4, the position of truss group 4 higher than the position of girder 2, to ensure to form certain angle between suspension cable 1 and girder 2; Suspension cable 1 is by truss group 4 and shear wall 5 anchor connection.
In order to the resistance to tension and load capability that ensure truss group 4 can meet testing requirements, preferred truss group 4 comprises column 15, anchoring tooth block 19 and two groups of supporting constructions, one end of supporting construction is fixed on shear wall 5, the other end is fixedly connected with by column 15, anchoring tooth block 19 is installed on column 15, for anchor connection suspension cable 1;
Further, in order to improve the stability of truss group 4, the present embodiment is preferably two groups of supporting constructions be arranged in parallel, and what the first boom 14 of supporting construction and one end of the second boom 16 were all parallel is fixed on shear wall 5, and all perpendicular to shear wall 5, the other end is fixedly connected with by column 15; One end that second boom 16 is fixed with column 15 is fixedly connected with shear wall 5 by the 3rd boom 17; Angled setting between 3rd boom 17 and shear wall 5; The cross section of the first boom 14, second boom 16 and the 3rd boom 17 is preferably enclosing square cross section; Be fixedly connected with by column 15 between first boom 14 of these two groups of supporting constructions, second boom 16 is except connecting by column 15, also be fixedly connected with by multiple lateral connection bar (not shown), and be all connected with the lower end of column 15, the 3rd boom 17 is fixedly connected with by horizontal diagonal brace (not shown).Each parts of truss group 4 are all connected by the second bolt 18, and the second bolt 18 is high-strength bolt, and truss group 4 is connected with shear wall 5 by connecting screw rod, and connecting screw rod is preferably the common screw of M48 ~ M52.
The suspension cable 1 of the present embodiment is by ground tackle 12 and the anchor connection of anchoring tooth block 19; Also being provided with the rope meter 11 of the anchoring status for monitoring suspension cable 1 between ground tackle 12 and anchoring tooth block 19, between ground tackle 12 and rope meter 11, being also set with pad 13.Particularly, the material of anchoring tooth block 19 is steel, and thickness is 20 ~ 30mm; Ground tackle 12 is 1 ~ 3 hole, adopts intermediate plate anchorage style; The dynamometry scope of rope meter 11 is 20t ~ 100t, for measuring the horizontal force of suspension cable 1.
Anchoring tooth block 19 is provided with bearing plate (not shown), suspension cable 1 is connected with bearing plate by ground tackle 12, bearing plate preferably adopts thickness to be the steel plate of 40 ~ 50mm, the anchoring angle of bearing plate is keeping with on the basis of the angle vertical of suspension cable 1, and the cable sag effect of the displacement and suspension cable 1 that consider girder 2 carries out bearing plate angle modification.
Use for the ease of test, the suspension cable 1 of the present embodiment is similar to be equivalent to
single steel strand is simulated, the similar equivalence of girder 2 horizontal reduced scale 1/2 adopts T section (model ratio of similitude is 7.423), king-tower structure is simulated by the truss group 4 be connected with shear wall 5, suspension cable 1 adopts threaded spindle cap nut to be connected with the connection of girder 2 by 8.8 grades of M20 pre embedded bolts 3 and web joint 7, and the anchoring of suspension cable 1 in truss group 4 adopts single hole anchor device 12 rope meter 11 and suspension cable 1 to be fixedly anchored in truss group.
Pre embedded bolt 3 adopts the high-strength bolt of 8.8 grades of M20, its pre-buried angle is ensureing under the prerequisite identical with suspension cable 1 anchoring angle, the vertical displacement of process of the test middle girder 2, the relative rotation of girder 2 and the cable sag effect of suspension cable 1 are considered, can effectively avoid suspension cable 1 and prestress tube bank 10 intersect, need not on girder 2, carry out perforate and cause damage; Web joint 7 adopts thickness to be the steel plate of 40mm, is used for connecting and anchoring suspension cable 1 and pre embedded bolt 3.Anchoring piece 8 mainly carries out sleeve extruding to suspension cable 1 end and forms the anchoring of P type, is convenient to the connection of suspension cable 1 and pre embedded bolt 3.
All parts of truss group 4 all adopt the box-type section of remaining silent, and one end of not shown horizontal diagonal brace is welded on the junction of the second boom 16 and column 15, and the other end is anchored on shear wall 5; The thickness of shear wall 5 is 80cm; Anchoring tooth block 19 is 50cm × 50cm for the spacing of the screw of anchor connection suspension cable 1, and screwhole diameter is
first bolt is M48mm, and its drag is about 50t; Rope meter 11 adopts the rope meter 11 of 20t and 30t demarcated, and is respectively used on two, both sides and middle three skew cables 1, can the Suo Li of suspension cable 1 under each operating mode in Measurement accuracy process of the test; Ground tackle 12 adopts single hole secondary ground tackle; Pad 13 adopts that 2cm is thick, diameter is
circular steel plate, diameter of bore is 17mm.
The present embodiment also proposed a kind of installation method tested with cable-stayed bridge, comprises the following steps:
S1, in girder 2 inner position bury pre embedded bolt 3 in advance;
S2, on shear wall 5 assembled truss group 4;
S3, blanking is carried out to the length of suspension cable 1, and sleeve extruding is carried out to its lower end, connection anchoring element 8;
S4, in plane and locus, relative positioning is carried out to girder 2, and the axial Compact Mounts of anchoring and horizontal limit devices;
S5, anchoring piece 8 suspension cable 1 is equipped with one end through the anchor hole 20 of web joint 7, the other end is provided with pad 13, rope meter 11, pad 13 and ground tackle 12 successively, is then anchored in truss group 4.
S6, by one end traction being installed with web joint 7 of suspension cable 1 to the position of the pre embedded bolt 3 on girder 2, a nut 9 on each cover on two pre embedded bolts 3, after pre embedded bolt 3 being each passed through the connecting hole 21 on web joint 7, undertaken connecting, tightening and leveling by nut 9.
S7, in truss group 4, carry out stretch-draw pretension by jack pair suspension cable 1, make suspension cable 1 and girder 2 form rigidity system.
In sum, the test cable-stayed bridge of the present embodiment and installation method simulate king-tower structure by the truss group 4 be anchored on shear wall 5, in test need not simulate half-bridge structure, only need simulate main bridge localized stage model, the overall size of effective reduction model, reduce the design of test, making and loading difficulty, reach the target of the equivalent stress performance of expection simultaneously, significantly reduce the expense of test, pre embedded bolt 3 is set in girder 2, pre embedded bolt 3 anchor connection suspension cable 1 is made by the mode of web joint 7 and anchoring piece 8 anchor connection, the prestress tube bank 10 effectively avoided in suspension cable 1 and girder 2 is intersected, achieve girder 2 and laterally reduce half, reduce further the scale of test, simultaneously need not perforate on girder 2, suspension cable 1 is allowed to be anchored at the bottom of beam, to girder 2 without any damage, what do not change suspension cable 1 is subject to power path, ensure that the entirety of girder 2 is stressed simultaneously, further reduce the size loading load, reduce test and load difficulty, reduce expense and the cost of test.Girder 2 adopts resiliency supported, can real simulation girder 2 and the stress performance of suspension cable 1 under elastic force balance state preferably, also can simulate comparatively accurately girder 2 ftracture after the stress performance of suspension cable 1 and girder 2 and ultimate resistance strength under stress.Web joint 7 and the dismountable connection of pre embedded bolt 3, make this test cable-stayed bridge to carry out easily dismantling and assembling, be beneficial to the levelling of Suo Li in test.
Embodiments of the invention provide in order to example with for the purpose of describing, and are not exhaustively or limit the invention to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Claims (10)
1. a test cable-stayed bridge, it is characterized in that, comprise horizontally disposed girder (2), the shear wall (5) vertically arranged and multiple skew cables (1), the two ends of many described suspension cables (1) respectively with described girder (2) and shear wall (5) anchor connection; Become in described girder (2) certain intervals to be embedded with and organizes built-in fitting more, often organize that described built-in fitting is all dismountable is connected with web joint (7), described web joint (7) and suspension cable (1) anchor connection.
2. test cable-stayed bridge according to claim 1, it is characterized in that, described built-in fitting comprises two pre embedded bolts be arranged in parallel (3), one end of two described pre embedded bolts (3) is embedded in described girder (2) respectively, the other end is all connected with described web joint (7), and described suspension cable (1) is by anchoring piece (8) and described web joint (7) anchor connection;
Angle between described pre embedded bolt (3) and girder (2) equals the angle between described suspension cable (1) and girder (2).
3. test cable-stayed bridge according to claim 2, it is characterized in that, the two ends of described web joint (7) are respectively equipped with the connecting hole (21) for being fixedly connected with described pre embedded bolt (3), and the centre of described web joint (7) is provided with for the anchor hole (20) with described suspension cable (1) anchor connection.
4. test cable-stayed bridge according to claim 2, it is characterized in that, be set with the nut (9) of multiple breakout capacity for strengthening described pre embedded bolt (3) outside described pre embedded bolt (3), described nut (9) is located in described girder (2).
5. test cable-stayed bridge according to claim 2, is characterized in that, described shear wall (5) is fixed with truss group (4), and the position of described truss group (4) is higher than the position of described girder (2); Described suspension cable (1) is by described truss group (4) and described shear wall (5) anchor connection.
6. test cable-stayed bridge according to claim 5, it is characterized in that, described truss group (4) comprises column (15), anchoring tooth block (19) and two groups of supporting constructions, one end of described supporting construction is fixed on described shear wall (5), the other end is fixedly connected with by described column (15), described anchoring tooth block (19) is installed on described column (15), for suspension cable described in anchor connection (1).
7. test cable-stayed bridge according to claim 6, is characterized in that, described suspension cable (1) is by ground tackle (12) and the anchor connection of described anchoring tooth block (19); The rope meter (11) for monitoring described suspension cable (1) anchoring status is also provided with between described ground tackle (12) and anchoring tooth block (19).
8. test cable-stayed bridge according to claim 6, it is characterized in that, described supporting construction comprises the first boom (14), the second boom (16) and the 3rd boom (17), one end of described first boom (14) and the second boom (16) is parallel to be respectively fixed on described shear wall (5), and respectively perpendicular to described shear wall (5), the other end is fixedly connected with by described column (15); One end that described second boom (16) and column (15) are fixed is fixedly connected with shear wall (5) by described 3rd boom (17); Angled setting between described 3rd boom (17) and described shear wall (5).
9. test cable-stayed bridge according to claim 8, is characterized in that, described suspension cable (1) is steel strand wires, and quantity is 1 ~ 3;
The cross section of described girder (2) is T-shaped, and the cross section of described first boom (14), the second boom (16) and the 3rd boom (17) is enclosing square cross section;
The grade of described pre embedded bolt (3) is 8.8 ~ 12.9 grades, and quantity is two, and diameter specifications is M20 ~ M36;
The material of described web joint (7) is steel, and thickness is 30 ~ 50mm, and quantity is identical with the quantity of described suspension cable (1);
Described anchoring piece (8) is the anchoring of P type;
The material of described anchoring tooth block (19) is steel, and thickness is 20 ~ 30mm;
Described ground tackle (12) is 1 ~ 3 hole;
The dynamometry scope of described rope meter (11) is 20t ~ 100t.
10. test the installation method with cable-stayed bridge, it is characterized in that, comprise the following steps:
S1, in girder (2) inner position bury pre embedded bolt (3) in advance;
S2, the upper assembled truss group (4) of shear wall (5);
S3, blanking is carried out to the length of suspension cable (1), and sleeve extruding is carried out to its lower end, connection anchoring element (8);
S4, in plane and locus, relative positioning is carried out to described girder (2), and the axial Compact Mounts of anchoring and horizontal limit devices, described girder (2) is arranged on level ground by resiliency supported;
S5, described anchoring piece (8) described suspension cable (1) is equipped with one end through the anchor hole (20) of web joint (7), the other end is provided with pad (13), rope meter (11), pad (13) and ground tackle (12) successively, is then anchored on described truss group (4).
S6, by the position of one end traction to the pre embedded bolt (3) on described girder (2) being installed with described web joint (7) of described suspension cable (1), two described pre embedded bolts (3) respectively put a nut (9), after described pre embedded bolt (3) being each passed through the connecting hole (21) on described web joint (7), undertaken connecting, tightening and leveling by described nut (9).
S7, on described truss group (4), carry out stretch-draw pretension by suspension cable described in jack pair (1), make described suspension cable (1) and girder (2) form rigidity system.
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| CN110031163A (en) * | 2019-03-22 | 2019-07-19 | 天津大学 | Modularization steel reinforced concrete combined bridge model and method for bridge structural damage identification test |
| CN110211481A (en) * | 2019-06-04 | 2019-09-06 | 大连海事大学 | A kind of experiment teaching system and its application method can be used for CONSTRUCTION OF CABLE-STAYED BRIDGE control demonstration |
| CN110700072A (en) * | 2019-11-08 | 2020-01-17 | 中国矿业大学 | Method for installing stay cable of cable-stayed bridge reduced scale test model |
| CN111175068A (en) * | 2020-02-24 | 2020-05-19 | 长沙理工大学 | Device and method for typical damage simulation of cable-stayed bridge |
| CN114061878A (en) * | 2021-11-19 | 2022-02-18 | 江苏科技大学 | Device for cable-beam coupling vibration test |
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| CN110031163B (en) * | 2019-03-22 | 2020-03-17 | 天津大学 | Modular steel-concrete combined bridge model and method for bridge damage identification test |
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| CN111175068A (en) * | 2020-02-24 | 2020-05-19 | 长沙理工大学 | Device and method for typical damage simulation of cable-stayed bridge |
| CN114061878A (en) * | 2021-11-19 | 2022-02-18 | 江苏科技大学 | Device for cable-beam coupling vibration test |
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