CN103558040A

CN103558040A - Equipment and method for cable-stayed bridge cable replacing engineering monitoring

Info

Publication number: CN103558040A
Application number: CN201310319886.1A
Authority: CN
Inventors: 汪哲荪; 朱大勇
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2013-07-26
Filing date: 2013-07-26
Publication date: 2014-02-05
Anticipated expiration: 2033-07-26
Also published as: CN103558040B

Abstract

The invention discloses equipment and a method for cable-stayed bridge cable replacing engineering monitoring. The monitoring comprises the monitoring of the bridge abutment, the bridge pier, the cable bent tower, the main girder and cables. In the cable-stayed bridge cable replacing engineering construction process, a theodolite is adopted to monitor the centre line of the surface of a cable-stayed bridge, a level instrument is adopted to monitor the elevation of the surface of the cable-stayed bridge and the top surface of the bridge abutment, cable bent tower swing test laser transmitting devices and cable bent tower swing target spot devices are adopted to monitor the inclination and the swing of the cable bent tower, guyed photoelectric displacement sensors are adopted to monitor the linear displacement of the main girder, photoelectric building component deflection testers are adopted to monitor the deflection of the main girder, communicating pipe type component inclination sensors are adopted to monitor the lateral torsion degree of the main girder, arm-type angular displacement sensors are adopted to monitor the angular displacement of the main girder structure, and three-dimensional swing sensors are adopted to monitor the swing of the main girder. According to the monitoring equipment used in the cable-stayed bridge cable replacing engineering process, monitoring can be performed on the cable-stayed bridge in a systematic, continuous and real-time manner, and technical supports are provided for the cable-stayed bridge cable replacing engineering construction process.

Description

Instrument and equipment and the method for the monitoring of cable-stayed bridge cable replacement engineering

Technical field

The present invention relates to a kind of instrument and equipment and method of when cable-stayed bridge cable replacement engineering is constructed, its abutment, bridge pier, Sarasota, girder, drag-line being monitored, specifically a kind of instrument and equipment and method of cable-stayed bridge cable replacement engineering monitoring.

Background technology

At present, some cable-stayed bridge is in operational process, impact due to factors such as load, material, maintenance, construction, design, environment, make cable-stayed bridge drag-line generation corrosion, the quality problems such as rupture, drop, relate to safety and the function of cable-stayed bridge, must change in time the stress of rope and adjustment girder, Sarasota, drag-line.But the monitoring instrument apparatus and method for using during existing cable-stayed bridge cable replacement engineering construction, all can not system, continuously, in real time girder, Sarasota, drag-line etc. are monitored, the situation that cannot reflect fast, in time stressed, the displacement of cable-stayed bridge in changing rope, swing etc., the adjustment that cannot exchange in time rope operation, Suo Li etc. provides technical basis, cannot effectively control the risk of cable-stayed bridge cable replacement engineering construction.

Summary of the invention

For current cable-stayed bridge, change the deficiency of rope monitoring instrument equipment, the present invention proposes a kind of instrument and equipment and method of cable-stayed bridge cable replacement engineering monitoring, its can system, continuously, in real time the abutment of cable-stayed bridge, bridge pier, Sarasota, girder, drag-line are monitored, for the construction of cable-stayed bridge cable replacement engineering provides technical guarantee.

Technical solution problem of the present invention adopts following technical scheme:

An instrument and equipment for cable-stayed bridge cable replacement engineering monitoring, includes the abutment of described cable-stayed bridge, bridge pier, Sarasota, girder, drag-line, adopts transit, spirit-leveling instrument, Sarasota rocking test laser beam emitting device I, Sarasota rocking test laser beam emitting device II, Sarasota bobbing target point apparatus I, Sarasota bobbing target point apparatus II, wind speed and wind is frequency recorder aweather, line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c, line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f, line-stretching photoelectric displacement sensor g, line-stretching photoelectric displacement sensor h, line-stretching photoelectric displacement sensor i, the horizontal laser light standard a of photoelectric deflection tester of building element a, measuring point device a, measuring point device b, measuring point device c, the horizontal laser light standard b of photoelectric deflection tester of building element b, measuring point device d, measuring point device e, measuring point device f, the horizontal laser light standard c of photoelectric deflection tester of building element c, measuring point device g, measuring point device h, measuring point device i, measuring point device j, level sensing device a and the communicating pipe of communicating pipe member inclination sensor a, level sensing device b and the communicating pipe of communicating pipe member inclination sensor b, level sensing device c and the communicating pipe of communicating pipe member inclination sensor c, level sensing device d and the communicating pipe of communicating pipe member inclination sensor d, level sensing device e and the communicating pipe of communicating pipe member inclination sensor e, level sensing device f and the communicating pipe of communicating pipe member inclination sensor f, arm-type angular displacement sensor, three-dimensional oscillating sensor a, three-dimensional oscillating sensor b, three-dimensional oscillating sensor c, three-dimensional oscillating sensor d, three-dimensional oscillating sensor e, three-dimensional oscillating sensor f, foil gauge, vibro-pickup, the instrument and equipment of frequency sensor is monitored, and described cable-stayed bridge is quoted measurement net and the leveling point of the earth, to its bridge floor center line, floor elevation, abutment absolute altitude is monitored, at the abutment of the left half-bridge of described cable-stayed bridge and right half-bridge, bridge pier, Sarasota, girder, monitoring instrument equipment on drag-line, and the installation site of those instrument and equipments is all identical.

Upstream side in described Sarasota bottom is provided with Sarasota rocking test laser beam emitting device I, Sarasota bobbing target point apparatus I is installed in the upstream side at described Sarasota top, downstream in described Sarasota bottom is provided with Sarasota rocking test laser beam emitting device II, in the downstream side at described Sarasota middle part, Sarasota bobbing target point apparatus II is installed, described Sarasota rocking test laser beam emitting device I is aimed at Sarasota bobbing target point apparatus I Emission Lasers, monitors described Sarasota top is longitudinal along bridge, bridge is horizontal degree of tilt and swing; Described Sarasota rocking test laser beam emitting device II is aimed at Sarasota bobbing target point apparatus II Emission Lasers, monitor described Sarasota middle part is longitudinal along bridge, bridge is horizontal degree of tilt and swing, in addition, observation station at cable-stayed bridge described in two sides, adopt transit to check the degree of tilt of the described Sarasota of monitoring, aweather frequency recorder of wind speed and wind is installed at the top of described Sarasota, monitors the suffered wind speed of described cable-stayed bridge, wind direction, wind frequency.

Line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c are installed on the platform cap of described abutment, the bracing wire hook of described line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c, be hung on three links of described Abutment girder bottom surface, monitor successively that described girder is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f are installed on the pier shaft of described bridge pier, the bracing wire hook of described line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f, be hung on three links of girder bottom surface, described bridge pier place, monitor successively that described girder is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, line-stretching photoelectric displacement sensor g is installed on the tower body of described Sarasota, line-stretching photoelectric displacement sensor h, line-stretching photoelectric displacement sensor i, described line-stretching photoelectric displacement sensor g, line-stretching photoelectric displacement sensor h, the bracing wire hook of line-stretching photoelectric displacement sensor i, be hung on three links of girder bottom surface, described Sarasota place, monitor successively described girder longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, the horizontal laser light standard a of photoelectric deflection tester of building element a is installed in the downstream of described abutment abutment body, 1/4 end bay in described girder bottom surface along bridge center line, 1/2 end bay, 3/4 end bay place, the measuring point device a of described photoelectric deflection tester of building element a is installed successively, measuring point device b, measuring point device c, three generating lasers of described horizontal laser light standard a, aim at respectively described measuring point device a, measuring point device b, measuring point device c sends the laser of level, monitor the amount of deflection of described cable-stayed bridge end bay girder, the horizontal laser light standard b of photoelectric deflection tester of building element b is installed in the downstream of described bridge pier pier shaft, in described girder bottom surface along in 1/4 time of bridge center line across, in 1/2 time across, in 3/4 time across locating, measuring point device d, measuring point device e, the measuring point device f of described photoelectric deflection tester of building element b are installed successively, three generating lasers of described horizontal laser light standard b, aim at respectively described measuring point device d, measuring point device e, the laser that measuring point device f sends level, monitor in described cable-stayed bridge time the amount of deflection across girder, the horizontal laser light standard c of photoelectric deflection tester of building element c is installed in the downstream of described Sarasota tower body, described girder bottom surface along bridge center line 1/8 in across, in 1/4 across, in 3/8 across, in 1/2 across locating, the measuring point device g of described photoelectric deflection tester of building element c is installed successively, measuring point device h, measuring point device i, measuring point device j, four generating lasers of described horizontal laser light standard c, aim at respectively described measuring point device g, measuring point device h, measuring point device i, measuring point device j sends the laser of level, monitor in described cable-stayed bridge half amount of deflection across girder, communicating pipe member inclination sensor a is installed in the bottom of girder described in Abutment, two level sensing device a of described communicating pipe member inclination sensor a, be arranged on respectively on two sides of described girder, described in Abutment, on girder bottom surface, there iing communicating pipe, this communicating pipe is communicated with the level sensing device a described in two, two described level sensing device a and fill with water in communicating pipe, the cross torsion degree of girder described in monitoring Abutment, the bottom of stating girder in bridge end bay span centre place is provided with communicating pipe member inclination sensor b, two level sensing device b of described communicating pipe member inclination sensor b, be arranged on respectively on two sides of described girder, in bridge end bay span centre place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device b described in two, two described level sensing device b and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring bridge end bay span centre place, the bottom of stating girder in bridge pier place is provided with communicating pipe member inclination sensor c, two level sensing device c of described communicating pipe member inclination sensor c, be arranged on respectively on two sides of described girder, in bridge pier place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device c described in two, two described level sensing device c and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring bridge pier place, the bottom of stating girder across span centre place in bridge time is provided with communicating pipe member inclination sensor d, two level sensing device d of described communicating pipe member inclination sensor d, be arranged on respectively on two sides of described girder, in bridge is inferior, across span centre place, states on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device d described in two, two described level sensing device d and fill with water in communicating pipe, state the cross torsion degree of girder across span centre place in monitoring bridge time, the bottom of stating girder in Sarasota place is provided with communicating pipe member inclination sensor e, two level sensing device e of described communicating pipe member inclination sensor e, be arranged on respectively on two sides of described girder, in Sarasota place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device e described in two, two described level sensing device e and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring Sarasota place, the bottom of stating girder across span centre place in bridge is provided with communicating pipe member inclination sensor f, two level sensing device f of described communicating pipe member inclination sensor f, be arranged on respectively on two sides of described girder, in bridge, across span centre place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device f described in two, two described level sensing device f and fill with water in communicating pipe, in monitoring bridge, across span centre place, state the cross torsion degree of girder, abutment at described cable-stayed bridge, end bay span centre, bridge pier, in inferior across span centre, Sarasota, in across there being two arm-type angular displacement sensors in span centre place girder cross-sectional configuration, these two described arm-type angular displacement sensors are placed in respectively on the web of both sides, described girder transversal section, the roller of described arm-type angular displacement sensor is resisted against the top board of described girder transversal section, monitor the angular displacement of described girder cross-sectional configuration, three-dimensional oscillating sensor a is installed on the base plate in girder described in Abutment, the center line of described three-dimensional oscillating sensor a is parallel with bridge center line, described in monitoring Abutment, girder is longitudinal along bridge, bridge is horizontal, the amplitude swinging in vertical three directions, frequency, in bridge end bay span centre place, state three-dimensional oscillating sensor b is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor b is parallel with bridge center line, amplitude, frequency that monitoring bridge end bay span centre place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge pier place, state three-dimensional oscillating sensor c is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor c is parallel with bridge center line, amplitude, frequency that monitoring bridge pier place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge time, across span centre place, state three-dimensional oscillating sensor d is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor d is parallel with bridge center line, amplitude, the frequency in monitoring bridge time, across span centre place, stating that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in Sarasota place, state on the base plate in girder three-dimensional oscillating sensor e is installed, the center line of described three-dimensional oscillating sensor e is parallel with bridge center line, amplitude, frequency that monitoring Sarasota place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge, across span centre place, state three-dimensional oscillating sensor f is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor f is parallel with bridge center line, amplitude, the frequency in monitoring bridge, across span centre place, stating that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in abutment, 1/4 end bay, 1/2 end bay, 3/4 end bay, bridge pier, 1/4 time across, in 1/2 time across, in 3/4 time across in, Sarasota, 1/8 across, in 1/4 across, in 3/8 across, across place, state on the upper and lower edge of girder in 1/2, along bridge center line, be pasted with foil gauge, by strain-gauge test, gone out the strain of main beam structure, by converting, monitor the stress of described main beam structure again, on the bridge floor of described cable-stayed bridge, parallel bridge center line is equidistantly mounted with several vibro-pickups, adopts vibration pick-up to test out the natural frequency, the vibration shape etc. of girder, monitors the kinematic behavior of described girder.

On the described drag-line of design appointment, frequency sensor is installed, before a drag-line of every replacing, after, and change the pulling force of monitoring drag-line described in those in rope process, employing is built-in with the double control-type prestress tensioning equipment of pressure transducer and hydraulic cylinder type elongation sensor, when new drag-line that jack tension is changed, by this double control-type prestress tensioning equipment, monitored the stretching force of described drag-line, elongation, on described bridge pier pier shaft, along vertical axis direction, be pasted with foil gauge, by strain-gauge test, gone out the strain of bridge pier structure, again by converting, monitor the stress of described bridge pier.

A method for cable-stayed bridge cable replacement engineering monitoring, carry out according to the following steps successively:

(1) make the monitoring scheme of cable-stayed bridge cable replacement engineering, do the preliminary work of cable-stayed bridge cable replacement engineering monitoring;

(2) press the scheme of cable-stayed bridge cable replacement engineering monitoring, on the abutment of cable-stayed bridge, bridge pier, Sarasota, girder, drag-line, monitoring instrument equipment is installed;

(3) all monitoring instrument equipment is debugged, and drafts out the monitoring prediction scheme that emergency condition occurs when cable-stayed bridge changes rope;

(4) change the stage before rope, the in the situation that of blocking-up traffic and shut-down, periodically operation monitoring instrument and equipment, monitors the center line of the bridge floor of cable-stayed bridge, floor elevation, abutment end face absolute altitude, Sarasota degree of tilt and swing, girder displacement of the lines, Main Girder Deflection, girder cross torsion degree, main beam structure angular displacement, girder swing, main beam structure stress, girder kinematic behavior, drag-line pulling force, bridge pier structure stress;

(5) change rope in the stage, the in the situation that of blocking-up traffic, operation monitoring instrument and equipment in real time, during to the Sarasota degree of tilt of cable-stayed bridge and swing, girder displacement of the lines, Main Girder Deflection, girder cross torsion degree, main beam structure angular displacement, girder swing, drag-line pulling force, cable tension, stretching force and elongation are monitored; And operation monitoring instrument and equipment periodically, the center line of the bridge floor of cable-stayed bridge, floor elevation, abutment end face absolute altitude, main beam structure stress, bridge pier structure stress are monitored;

(6) change the stage after rope, the in the situation that of blocking-up traffic and shut-down, periodically operation monitoring instrument and equipment, monitors the center line of the bridge floor of cable-stayed bridge, floor elevation, abutment end face absolute altitude, Sarasota degree of tilt and swing, girder displacement of the lines, Main Girder Deflection, girder cross torsion degree, main beam structure angular displacement, girder swing, main beam structure stress, girder kinematic behavior, drag-line pulling force, bridge pier structure stress;

(7) submit Surveillance to, complete the work of cable-stayed bridge cable replacement engineering monitoring.

The instrument and equipment that in the present invention, cable-stayed bridge changes rope monitoring is based on following principle of work:

The principle of work of Sarasota rocking test laser beam emitting device I, Sarasota rocking test laser beam emitting device II, Sarasota bobbing target point apparatus I, Sarasota bobbing target point apparatus II monitoring Sarasota degree of tilt and swing: Sarasota, can run-off the straight and swing under the effects such as natural frequency, girder load, Cable power, wind carry.Now by the Sarasota rocking test generating laser a that is arranged on the Sarasota rocking test laser beam emitting device I of Sarasota bottom upstream side, to the Sarasota that is arranged on the Sarasota bobbing target point apparatus I on described Sarasota head upstream side, swing target spot device a Emission Lasers, test Sarasota top along the horizontal degree of tilt of bridge and swing; By the Sarasota rocking test generating laser b that is arranged on the Sarasota rocking test laser beam emitting device I of Sarasota bottom upstream side, to the Sarasota that is arranged on the Sarasota bobbing target point apparatus I on described Sarasota head upstream side, swing target spot device b Emission Lasers, test Sarasota top Yan Qiao degree of tilt and swing longitudinally; By the Sarasota rocking test generating laser c that is arranged on the Sarasota rocking test laser beam emitting device II in downstream, Sarasota bottom, to the Sarasota that is arranged on the Sarasota bobbing target point apparatus II in the downstream side of described Sarasota middle part, swing target spot device c Emission Lasers, test Sarasota top along the horizontal degree of tilt of bridge and swing; By the Sarasota rocking test generating laser d that is arranged on the Sarasota rocking test laser beam emitting device II in downstream, Sarasota bottom, to the Sarasota that is arranged on the Sarasota bobbing target point apparatus II in the downstream side of described Sarasota middle part, swing target spot device d Emission Lasers, test Sarasota middle part along bridge degree of tilt and swing longitudinally.Because structure, the function of Sarasota rocking test generating laser a, Sarasota rocking test generating laser b, Sarasota rocking test generating laser c, Sarasota rocking test generating laser d are identical, so be Sarasota rocking test generating laser of the same race, and Sarasota swings target spot device a, Sarasota and swings target spot device b, Sarasota and swing target spot device c, Sarasota to swing structure, the function of target spot device d identical, so be also that Sarasota of the same race swings target spot device.During monitoring, the Sarasota rocking test generating laser that is arranged on Sarasota bottom is launched relatively fixed laser, being irradiated to Sarasota swings on the optical fiber target spot device that target spot device is comprised of hundreds of directional light seal wires, the light transmitting filament of this optical fiber target spot device on the corresponding light activated element in end, is transferred out the signal of sensing light conduction by this light activated element.Swing because of Sarasota, the light transmitting filament top rail that the laser spots that Sarasota rocking test generating laser is launched swings target spot device optical fiber target spot device at Sarasota is to moving around, record the distance that spaced furthest is irradiated to two light transmitting filaments of laser, just can monitor to obtain the amplitude of oscillation that makes progress the party of Sarasota, and test out each swing interlude, just can monitor to obtain the frequency that upwards swings the party of Sarasota.The center line that swings target spot device a, Sarasota swing target spot device c due to Sarasota is arranged on Sarasota by being parallel to bridge center line, the optical fiber target spot device light transmitting filament that is Sarasota swing target spot device a, Sarasota swing target spot device c is parallel to the arrangement of bridge centerline direction, so Sarasota swings target spot device a, Sarasota swings target spot device c and can monitor Sarasota along the horizontal swing of bridge; Again because Sarasota swings center line that target spot device b, Sarasota swing target spot device d by being arranged on Sarasota perpendicular to bridge center line, the optical fiber target spot device light transmitting filament that is Sarasota swing target spot device b, Sarasota swing target spot device d is arranged perpendicular to bridge centerline direction, so Sarasota swings target spot device b, Sarasota swing target spot device d can monitor Sarasota and swing longitudinally along bridge.With measurement equipment, record the vertical distance that Sarasota rocking test generating laser to Sarasota swings target spot device optical fiber target spot device, establishing this vertical distance is y.Cable-stayed bridge is before changing rope, and the central point that records laser oscillating on optical fiber target spot device is initial point x ₀.Cable-stayed bridge is in changing rope, and the central point that records laser oscillating on optical fiber target spot device is x ₁.If cable-stayed bridge changes in rope changing Suo Qianyu, on optical fiber target spot device, the difference of the central point of two laser oscillatings is x, i.e. x=x ₁-x ₀.: recording the degree of tilt that Sarasota makes progress the party is θ, i.e. θ=arctgx/y.So, Sarasota rocking test laser beam emitting device I and Sarasota bobbing target point apparatus I can be monitored the degree of tilt that Sarasota top is longitudinal along bridge, bridge is horizontal, and Sarasota rocking test laser beam emitting device II and Sarasota bobbing target point apparatus II can be monitored the degree of tilt that Sarasota middle part is longitudinal along bridge, bridge is horizontal.Meanwhile, at Sarasota swing target spot device a, Sarasota swing target spot device b, Sarasota swing target spot device c, Sarasota, swing the oscillation gauge that target spot device d inside is provided with auxiliary use separately, in every oscillation gauge, be mounted with a suspended wall plate.The cantilever slab plate face that Sarasota is swung to the oscillation gauge in target spot device a, Sarasota swing target spot device c is vertical, and plate axis and bridge center line be arranged in parallel, and the cantilever slab plate face of the oscillation gauge in Sarasota swing target spot device b, Sarasota swing target spot device d is vertical, and plate axis arranges with bridge center line is vertical.Because the transversal section of those cantilever slabs is rectangular thin plate, its thickness of slab size is more than wide little of plate, what be cantilever slab in the rigidity of thickness of slab direction more than plate width direction is little, so when Sarasota swings, plate axis can produce distortion and swing perpendicular to the cantilever slab of Sarasota swaying direction under inertial force effect, the magnet piece of cantilever slab plate end, along with the swing of cantilever slab, swing, switching the magnetic line of force on the magneto sensor with magnet piece interval delta distance, the transducing signal of magneto sensor output is with magnetic line of force Strength Changes size, by the size of magneto sensor output transducing signal, obtained the amplitude of oscillation of Sarasota.So Sarasota swings target spot device a, Sarasota and swings target spot device b, Sarasota and swing oscillation gauge that target spot device c, Sarasota swing target spot device d and can check and monitor that top, the middle part of Sarasota is longitudinal along bridge, amplitude and the frequency of bridge teeter.

The principle of work of described line-stretching photoelectric displacement sensor monitoring girder displacement of the lines: line-stretching photoelectric displacement sensor is installed on relatively unshift object, the bracing wire of pulling out from line-stretching photoelectric displacement sensor hangs over the link of testee, rely on the elastic force of the built-in disc spring retraction of line-stretching photoelectric displacement sensor, bracing wire is tightened all the time.When testee is subjected to displacement, drive the bracing wire of line-stretching photoelectric displacement sensor pull out or retract, through the transmission of the inner gear train of line-stretching photoelectric displacement sensor, by modulation wheel, switch the light on two photoelectric interrupters, two photoelectric interrupters are exported corresponding transducing signal.If the displacement that testee produces is large, the number of times that modulation wheel rotates is just many, and modulation wheel switches two photoelectric interrupter glazed threads often, and the number of times of transducing signal output signal is just many.On abutment, bridge pier, Sarasota, three line-stretching photoelectric displacement sensors are installed separately now, the bracing wire hook of three line-stretching photoelectric displacement sensors at every place respectively longitudinal along bridge, bridge is horizontal, vertical three directions are hung on three hooks of girder bottom, so line-stretching photoelectric displacement sensor can be monitored, girder is longitudinal along bridge, bridge is horizontal, the displacement of the lines of vertical three directions.

The principle of work of described photoelectric deflection tester of building element monitoring Main Girder Deflection: at relatively unshift abutment, bridge pier, the horizontal laser light standard of photoelectric deflection tester of building element is installed in downstream on Sarasota, girder bottom surface in spanning is equidistantly provided with several measuring point devices of photoelectric deflection tester of building element successively along bridge center line, several generating lasers on described horizontal laser light standard, to described measuring point device, send accordingly separately the reference laser of level, when the gear train drive device for extracting light in described measuring point device vertically comes and goes and slides on slide rail, drive displacement transducer output signal, the originally device for extracting light of take obtains " zero " point that just reference laser is displacement, when test device for extracting light displacement change amount that obtains reference laser of take is amount of deflection that girder was occurred, so photoelectric deflection tester of building element can test out the amount of deflection of girder appointed part in spanning.

The principle of work of described communicating pipe member inclination sensor monitoring girder cross torsion degree: two level sensing devices of described communicating pipe member inclination sensor are arranged on respectively the both sides of girder, these two level sensing devices are communicated with communicating pipe in girder bottom surface, at two level sensing devices with fill with water in communicating pipe, adjust the height of two level sensing devices, when the water pressure value of the water pressure sensor output of two level sensing devices is equated, can carry out the monitoring of girder cross torsion degree.When girder generation cross torsion is spent, in the piezometric tube of two level sensing devices, form water-head △ h, by described water pressure sensor, test out the poor △ p of water pressure.According to < < fluid mechanics > >, know: water pressure p equals water capacity weight γ and water level h is long-pending, be p=γ h, △ p=γ △ h or △ h=△ p/ γ, the width L that the distance that existing two level sensing devices are separated by is girder, the crosswise angle of girder α=arctg △ h/L, so communicating pipe member inclination sensor can test out the cross torsion degree of girder.

The principle of work of described arm-type angular displacement sensor: arm type photoelectric angular displacement sensor is fixed on the web of girder, is tight against the pulley that is movably placed in armed lever one end on the top board of girder by disc spring elastic force.The angular displacement producing between the web of girder and top board, by armed lever, driven the main shaft of arm type photoelectric angular displacement sensor, transmission through the inner gear train of arm-type angular displacement sensor, the modulation wheel fast rotational of the minimum engaged wheel of gear set, switching two light on photoelectric interrupter, two photoelectric interrupters are exported corresponding transducing signal, so arm-type angular displacement sensor can test out the angular displacement of main beam structure.

The principle of work that described three-dimensional oscillating Sensor monitoring girder swings: described three-dimensional oscillating sensor is installed on the base plate in girder, and the center line of this three-dimensional oscillating sensor is parallel with bridge center line, in described three-dimensional oscillating sensor, be mounted with cantilever slab a, cantilever slab b, cantilever slab c, and the smallest cross-sectional moment of inertia center line of cantilever slab a is parallel to bridge center line, the smallest cross-sectional moment of inertia center line of cantilever slab b points to vertical direction perpendicular to the smallest cross-sectional moment of inertia center line of bridge center line, cantilever slab c; The plate end of described cantilever slab a is mounted with magnet piece a, outside cantilever slab a plate axis and with the position of magnet piece a interval △, is mounted with magneto sensor a; The plate end of described cantilever slab b is mounted with magnet piece b, outside cantilever slab b plate axis and with the position of magnet piece b interval △, is mounted with magneto sensor b; The plate end of described cantilever slab c is mounted with magnet piece c, outside cantilever slab c plate axis and with the position of magnet piece c interval △, is mounted with magneto sensor c.When girder is during along bridge longitudinal oscillation, cantilever slab a can produce swing, and the magnet piece a of cantilever slab a plate end switches the magnetic line of force on magneto sensor a back and forth, the corresponding transducing signal that swings of magneto sensor a output; When girder is during along bridge teeter, cantilever slab b can produce swing, and the magnet piece b of cantilever slab b plate end switches the magnetic line of force on magneto sensor b back and forth, and magneto sensor b exports the transducing signal of corresponding swing; When girder swings along vertical direction, cantilever slab c can produce swing, and the magnet piece c of cantilever slab c plate end switches the magnetic line of force on magneto sensor c back and forth, the corresponding transducing signal that swings of magneto sensor c output; When the inclined to one side bridge longitudinal oscillation in girder edge, cantilever slab a, cantilever slab b all can produce swing, the magnet piece a of cantilever slab a plate end switches the magnetic line of force on magneto sensor a back and forth, the magnet piece b of cantilever slab b plate end switches the magnetic line of force on magneto sensor b back and forth, and cantilever slab a is larger than the amplitude of cantilever slab b switch in magnetic force line, magneto sensor a, magneto sensor b export corresponding swing transducing signal separately.After the swing of girder disappears, those cantilever slabs all recover former stationary state gradually.By that analogy, described three-dimensional oscillating sensor can be monitored girder upper amplitude, the frequency swinging in any direction.

The principle of work of described foil gauge monitoring main beam structure stress: paste foil gauge on described main beam structure, deform after main beam stress, those foil gauges also deform immediately and change its resistance value, then go out its strain value by strain-gauge test.According to the stress σ of " hooke theorem ", equal structured material elastic modulus E and strain stress is long-pending, i.e. σ=E ε, draws the stress of girder, so foil gauge can be monitored the stress of main beam structure through converting.

The principle of work of described vibro-pickup monitoring girder kinematic behavior: at several the vibro-pickups of end face (bridge floor) the equidistant arrangement of upper parallel bridge center line of described girder, by vibration pick-up, test out girder in amplitude, the vibration frequency of every vibro-pickup position, vibro-pickup draws by analysis vibration shape, natural frequency of described girder etc. with processing, so can be monitored the kinematic behavior of girder.

The principle of work of described frequency sensor monitoring drag-line pulling force: on described drag-line, frequency sensor is installed, according to the relation of the suffered tensile force f of drag-line and vibration frequency P, the size that is Cable forces F is directly proportional to vibration frequency P, by frequency sensor, tested out the frequency of described drag-line, frequency sensor through converting, draws the pulling force that drag-line is suffered, so can be monitored the pulling force of described drag-line.

When changing drag-line, described double control-type prestress tensioning equipment monitors the principle of work of cable tension power, elongation: described double control-type prestress tensioning equipment is mounted with hydraulic fluid pressure sensor and hydraulic cylinder type elongation sensor on the oil circuit of hydraulic power unit, the stretching force of lifting jack while being gone out to change drag-line by hydraulic fluid pressure sensor test, the drilling depth amount of jack piston rod while being gone out to change drag-line by hydraulic cylinder type elongation sensor test, the drilling depth amount of this jack piston rod is equal to the elongation of drag-line.By hydraulic pump, flow to described hydraulic cylinder type elongation sensor left chamber high pressure liquid force feed, piston in hydraulic cylinder type elongation sensor cylinder body is promoted to the right, hydraulic oil in the right chamber of hydraulic cylinder type elongation sensor is flowed to the stretch-draw work that lifting jack carries out drag-line.When piston moves right, by the piston displacement sensor in hydraulic cylinder type elongation sensor cylinder body, measured the displacement of piston.Relation according to jack piston rod drilling depth amount and hydraulic cylinder type elongation sensor cylinder body to oil mass, through hydraulic cylinder type elongation sensor output hydraulic pressure oil volume and the conversion of inputting jack hydraulic oil volume, draw the drilling depth amount (drag-line elongation) of jack piston rod.If the internal diameter of hydraulic cylinder type elongation sensor cylinder body is D ₁, the displacement of being measured described cylinder body inner carrier by piston displacement sensor is L ₁, what hydraulic cylinder type elongation sensor flowed to lifting jack is V to oil mass ₁=π D ₁ ²l ₁/ 4.The internal diameter of establishing again jack hydraulic cylinder is D ₂, the drilling depth amount of jack piston rod is L ₂, the oil inlet quantity of jack hydraulic cylinder is V ₂=π D ₂ ²l ₂/ 4.According to hydromechanical continuity equation, within communicating pipe, the inlet flow scale of construction must be equal to the output stream scale of construction, so hydraulic cylinder type elongation sensor equals lifting jack oil inlet quantity, i.e. V to oil mass ₁=V ₂: π D ₁ ²l ₁/ 4=π D ₂ ²l ₂/ 4, the elongation of drag-line is L ₂=D ₁ ²l ₁/ D ₂ ².So double control-type prestress tensioning equipment can be monitored cable tension power, elongation when changing drag-line.

Compared with the prior art, beneficial effect of the present invention is embodied in: instrument and equipment and the method for a kind of cable-stayed bridge cable replacement engineering monitoring that the present invention proposes, its energy system, continuously, bridge floor position of center line to described cable-stayed bridge in real time, floor elevation, abutment absolute altitude is monitored, degree of tilt to described Sarasota, swing is monitored, displacement of the lines to described girder, amount of deflection, cross torsion, angular displacement, swing, stress, kinematic behavior is monitored, pulling force to described drag-line, stretching force, elongation is monitored, stress to described bridge pier is monitored, for the construction of cable-stayed bridge cable replacement engineering provides technical guarantee.

Accompanying drawing explanation

Fig. 1 is the monitoring schematic diagram of cable-stayed bridge cable replacement engineering full-bridge forward sight of the present invention.

Fig. 2 is the monitoring schematic diagram that cable-stayed bridge cable replacement engineering full-bridge of the present invention is overlooked.

Fig. 3 is the monitoring schematic diagram that cable-stayed bridge cable replacement engineering Sarasota of the present invention right side is looked.

Fig. 4 is the monitoring schematic diagram of cable-stayed bridge cable replacement engineering Sarasota forward sight of the present invention.

Fig. 5 is the monitoring schematic diagram of cable-stayed bridge cable replacement engineering Sarasota backsight of the present invention.

Fig. 6 is the monitoring schematic diagram that cable-stayed bridge cable replacement engineering Abutment girder of the present invention right side is looked.

Fig. 7 is the monitoring schematic diagram of cable-stayed bridge cable replacement engineering bridge end bay girder forward sight of the present invention.

Fig. 8 is the monitoring schematic diagram that cable-stayed bridge cable replacement engineering bridge end bay girder of the present invention is looked up.

Fig. 9 is the monitoring schematic diagram that girder right side, cable-stayed bridge cable replacement engineering bridge pier of the present invention place is looked.

Figure 10 is across the monitoring schematic diagram of girder forward sight in cable-stayed bridge cable replacement engineering bridge of the present invention time.

Figure 11 is the monitoring schematic diagram of looking up across girder in cable-stayed bridge cable replacement engineering bridge of the present invention time.

Figure 12 is the monitoring schematic diagram that girder right side, cable-stayed bridge cable replacement engineering Sarasota of the present invention place is looked.

Figure 13 is across the monitoring schematic diagram of girder forward sight in cable-stayed bridge cable replacement engineering bridge of the present invention half.

Figure 14 is the monitoring schematic diagram of looking up across girder in cable-stayed bridge cable replacement engineering bridge of the present invention half.

Number in the figure: 1 cable-stayed bridge, Bridge 2 platform, 3 bridge piers, 4 Sarasotas, 5 girders, 6 drag-lines, 7 river courses, 8 Sarasota rocking test laser beam emitting device I, 9 Sarasota rocking test laser beam emitting device II, 10 Sarasota bobbing target point apparatus I, 11 Sarasota bobbing target point apparatus II, 12 wind speed and wind are frequency recorder aweather, 13 line-stretching photoelectric displacement sensor a, 14 line-stretching photoelectric displacement sensor b, 15 line-stretching photoelectric displacement sensor c, 16 line-stretching photoelectric displacement sensor d, 17 line-stretching photoelectric displacement sensor e, 18 line-stretching photoelectric displacement sensor f, 19 line-stretching photoelectric displacement sensor g, 20 line-stretching photoelectric displacement sensor h, 21 line-stretching photoelectric displacement sensor i, 22 horizontal laser light standard a, 23 horizontal laser light standard b, 24 horizontal laser light standard c, 25 measuring point device a, 26 measuring point device b, 27 measuring point device c, 28 measuring point device d, 29 measuring point device e, 30 measuring point device f, 31 measuring point device g, 32 measuring point device h, 33 measuring point device i, 34 measuring point device j, 35 level sensing device a, 36 level sensing device b, 37 level sensing device c, 38 level sensing device d, 39 level sensing device e, 40 level sensing device f, 41 communicating pipes, 42 arm-type angular displacement sensors, 43 three-dimensional oscillating sensor a, 44 three-dimensional oscillating sensor c, 45 three-dimensional oscillating sensor e, 46 foil gauges, 47 vibro-pickups, 48 frequency sensors.

Embodiment

Referring to Fig. 1～Figure 14, the instrument and equipment for a kind of cable-stayed bridge cable replacement engineering monitoring of the present invention, has comprised the abutment 2 to cable-stayed bridge 1, bridge pier 3, Sarasota 4, girder 5, the monitoring of drag-line 6, is characterized in that: the abutment 2 of described cable-stayed bridge 1, bridge pier 3, Sarasota 4, girder 5, drag-line 6, adopts transit, spirit-leveling instrument, Sarasota rocking test laser beam emitting device I 8, Sarasota rocking test laser beam emitting device II 9, Sarasota bobbing target point apparatus I 10, Sarasota bobbing target point apparatus II 11, wind speed and wind is frequency recorder 12 aweather, line-stretching photoelectric displacement sensor a13, line-stretching photoelectric displacement sensor b14, line-stretching photoelectric displacement sensor c15, line-stretching photoelectric displacement sensor d16, line-stretching photoelectric displacement sensor e17, line-stretching photoelectric displacement sensor f18, line-stretching photoelectric displacement sensor g19, line-stretching photoelectric displacement sensor h20, line-stretching photoelectric displacement sensor i21, the horizontal laser light standard a22 of photoelectric deflection tester of building element a, measuring point device a25, measuring point device b26, measuring point device c27, the horizontal laser light standard b23 of photoelectric deflection tester of building element b, measuring point device d28, measuring point device e29, measuring point device f30, the horizontal laser light standard c24 of photoelectric deflection tester of building element c, measuring point device g31, measuring point device h32, measuring point device i33, measuring point device j34, the level sensing device a35 of communicating pipe member inclination sensor a and communicating pipe 41, the level sensing device b36 of communicating pipe member inclination sensor b and communicating pipe 41, the level sensing device c37 of communicating pipe member inclination sensor c and communicating pipe 41, the level sensing device d38 of communicating pipe member inclination sensor d and communicating pipe 41, the level sensing device e39 of communicating pipe member inclination sensor e and communicating pipe 41, the level sensing device f40 of communicating pipe member inclination sensor f and communicating pipe 41, arm-type angular displacement sensor 42, three-dimensional oscillating sensor a43, three-dimensional oscillating sensor b, three-dimensional oscillating sensor c44, three-dimensional oscillating sensor d, three-dimensional oscillating sensor e45, three-dimensional oscillating sensor f, foil gauge 46, vibro-pickup 47, the instrument and equipment of frequency sensor 48 is monitored.Described cable-stayed bridge 1 is quoted measurement net and the leveling point of the earth, and its bridge floor center line, floor elevation, abutment 2 absolute altitudes are monitored.Monitoring instrument equipment on the abutment 2 of the left half-bridge of described cable-stayed bridge 1 and right half-bridge, bridge pier 3, Sarasota 4, girder 5, drag-line 6, and the installation site of those instrument and equipments is all identical.

Upstream side in described Sarasota 4 bottoms is provided with Sarasota rocking test laser beam emitting device I 8, Sarasota bobbing target point apparatus I 10 is installed in the upstream side at described Sarasota 4 tops, in the downstream of described Sarasota 4 bottoms, Sarasota rocking test laser beam emitting device II 9 is installed, Sarasota bobbing target point apparatus II 11 is installed in the downstream side at described Sarasota 4 middle parts.Described Sarasota rocking test laser beam emitting device I 8 is aimed at Sarasota bobbing target point apparatus I 10 Emission Lasers, monitors described Sarasota 4 tops are longitudinal along bridge, bridge is horizontal degree of tilt and swing; Described Sarasota rocking test laser beam emitting device II 9 is aimed at Sarasota bobbing target point apparatus II 11 Emission Lasers, monitors described Sarasota 4 middle parts are longitudinal along bridge, bridge is horizontal degree of tilt and swing.In addition, in the observation station of cable-stayed bridge described in two sides 1, adopt transit to check the degree of tilt of the described Sarasota 4 of monitoring.Aweather frequency recorder 12 of wind speed and wind is installed at the top of described Sarasota 4, monitors the suffered wind speed of described cable-stayed bridge 1, wind direction, wind frequency.

Line-stretching photoelectric displacement sensor a13, line-stretching photoelectric displacement sensor b14, line-stretching photoelectric displacement sensor c15 are installed on the platform cap of described abutment 2, the bracing wire hook of described line-stretching photoelectric displacement sensor a13, line-stretching photoelectric displacement sensor b14, line-stretching photoelectric displacement sensor c15, be hung on three links of described abutment 2 place's girder 5 bottom surfaces, monitor successively that described girder 5 is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions; Line-stretching photoelectric displacement sensor d16, line-stretching photoelectric displacement sensor e17, line-stretching photoelectric displacement sensor f18 are installed on the pier shaft of described bridge pier 3, the bracing wire hook of described line-stretching photoelectric displacement sensor d16, line-stretching photoelectric displacement sensor e17, line-stretching photoelectric displacement sensor f18, be hung on three links of described bridge pier 3 place's girder 5 bottom surfaces, monitor successively that described girder 5 is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions; Line-stretching photoelectric displacement sensor g19, line-stretching photoelectric displacement sensor h20, line-stretching photoelectric displacement sensor i21 are installed on the tower body of described Sarasota 4, the bracing wire hook of described line-stretching photoelectric displacement sensor g19, line-stretching photoelectric displacement sensor h20, line-stretching photoelectric displacement sensor i21, be hung on three links of described Sarasota 4 place's girder 5 bottom surfaces, monitor successively that described girder 5 is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions.The horizontal laser light standard a22 of photoelectric deflection tester of building element a is installed in the downstream of described abutment 2 abutment bodies, in described girder 5 bottom surfaces along 1/4 end bay, 1/2 end bay, the 3/4 end bay place of bridge center line, measuring point device a25, measuring point device b26, the measuring point device c27 of described photoelectric deflection tester of building element a are installed successively, three generating lasers of described horizontal laser light standard a22, aim at respectively described measuring point device a25, measuring point device b26, the laser that measuring point device c27 sends level, monitor the amount of deflection of described cable-stayed bridge 1 end bay girder 5, the horizontal laser light standard b23 of photoelectric deflection tester of building element b is installed in the downstream of described bridge pier 3 pier shafts, in described girder 5 bottom surfaces along in 1/4 time of bridge center line across, in 1/2 time across, in 3/4 time across locating, measuring point device d28, measuring point device e29, the measuring point device f30 of described photoelectric deflection tester of building element b are installed successively, three generating lasers of described horizontal laser light standard b23, aim at respectively described measuring point device d28, measuring point device e29, the laser that measuring point device f30 sends level, monitor in described cable-stayed bridge 1 time the amount of deflection across girder 5, the horizontal laser light standard c24 of photoelectric deflection tester of building element c is installed in the downstream of described Sarasota 4 tower bodies, described girder 5 bottom surfaces along bridge center line 1/8 in across, in 1/4 across, in 3/8 across, in 1/2 across locating, the measuring point device g31 of described photoelectric deflection tester of building element c is installed successively, measuring point device h32, measuring point device i33, measuring point device j34, four generating lasers of described horizontal laser light standard c24, aim at respectively described measuring point device g31, measuring point device h32, measuring point device i33, measuring point device j34 sends the laser of level, monitor in described cable-stayed bridge 1 half amount of deflection across girder 5.The bottom of stating girder 5 in abutment 2 places is provided with communicating pipe member inclination sensor a, two level sensing device a35 of described communicating pipe member inclination sensor a, be arranged on respectively on two sides of described girder 5, in abutment 2 places, state on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device a35 described in two, two described level sensing device a35 and fill with water in communicating pipe 41, the cross torsion degree of girder 5 is stated in monitoring abutment 2 places; The bottom of stating girder 5 in bridge end bay span centre place is provided with communicating pipe member inclination sensor b, two level sensing device b36 of described communicating pipe member inclination sensor b, be arranged on respectively on two sides of described girder 5, in bridge end bay span centre place, state on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device b36 described in two, two described level sensing device b36 and fill with water in communicating pipe 41, the cross torsion degree of girder 5 is stated in monitoring bridge end bay span centre place; The bottom of stating girder 5 in bridge pier 3 places is provided with communicating pipe member inclination sensor c, two level sensing device c37 of described communicating pipe member inclination sensor c, be arranged on respectively on two sides of described girder 5, in bridge pier 3 places, state on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device c37 described in two, two described level sensing device c37 and fill with water in communicating pipe 41, the cross torsion degree of girder 5 is stated in monitoring bridge pier 3 places; The bottom of stating girder 5 across span centre place in bridge time is provided with communicating pipe member inclination sensor d, two level sensing device d38 of described communicating pipe member inclination sensor d, be arranged on respectively on two sides of described girder 5, in bridge is inferior, across span centre place, states on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device d38 described in two, two described level sensing device d38 and fill with water in communicating pipe 41, state the cross torsion degree of girder 5 across span centre place in monitoring bridge time; The bottom of stating girder 5 in Sarasota 4 places is provided with communicating pipe member inclination sensor e, two level sensing device e39 of described communicating pipe member inclination sensor e, be arranged on respectively on two sides of described girder 5, in Sarasota 4 places, state on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device e39 described in two, two described level sensing device e39 and fill with water in communicating pipe 41, the cross torsion degree of girder 5 is stated in monitoring Sarasota 4 places; The bottom of stating girder 5 across span centre place in bridge is provided with communicating pipe member inclination sensor f, two level sensing device f40 of described communicating pipe member inclination sensor f, be arranged on respectively on two sides of described girder 5, in bridge, across span centre place, state on girder 5 bottom surfaces and have communicating pipe 41, this communicating pipe 41 is communicated with the level sensing device f40 described in two, two described level sensing device f40 and fill with water in communicating pipe 41, state the cross torsion degree of girder 5 across span centre place in monitoring bridge.The abutment 2 of described cable-stayed bridge 1, end bay span centre, bridge pier 3, inferior in across span centre, Sarasota 4, in have two arm-type angular displacement sensors 42 in across span centre place girder 5 cross-sectional configurations, these two described arm-type angular displacement sensors 42 are placed in respectively on the web of described girder 5 both sides, transversal section, the roller of described arm-type angular displacement sensor 42 is resisted against the top board of described girder 5 transversal section, monitors the angular displacement of described girder 5 cross-sectional configurations.In abutment 2 places, state three-dimensional oscillating sensor a43 is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor a43 is parallel with bridge center line, amplitude, frequency that monitoring abutment 3 places state that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions; In bridge end bay span centre place, state three-dimensional oscillating sensor b is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor b is parallel with bridge center line, amplitude, frequency that monitoring bridge end bay span centre place states that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions; In bridge pier 3 places, state three-dimensional oscillating sensor c44 is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor c44 is parallel with bridge center line, amplitude, frequency that monitoring bridge pier 3 places state that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions; In bridge time, across span centre place, state three-dimensional oscillating sensor d is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor d is parallel with bridge center line, amplitude, the frequency in monitoring bridge time, across span centre place, stating that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions; In Sarasota 4 places, state three-dimensional oscillating sensor e45 is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor e45 is parallel with bridge center line, amplitude, frequency that monitoring Sarasota 4 places state that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions; In bridge, across span centre place, state three-dimensional oscillating sensor f is installed on the base plate in girder 5, the center line of described three-dimensional oscillating sensor f is parallel with bridge center line, amplitude, the frequency in monitoring bridge, across span centre place, stating that girder 5 is longitudinal along bridge, bridge is horizontal, swing in vertical three directions.In abutment 2,1/4 end bay, 1/2 end bay, 3/4 end bay, bridge pier 3,1/4 time across, in 1/2 time across, in 3/4 time across in, Sarasota 4,1/8 across, in 1/4 across, in 3/8 across, across place, state on the upper and lower edge of girder 5 in 1/2, along bridge center line, be pasted with foil gauge 46, by strain-gauge test, gone out the strain of main beam structure, by converting, monitor the stress of described girder 5 structures again.On the bridge floor of described cable-stayed bridge 1, parallel bridge center line is equidistantly mounted with several vibro-pickups 47, adopts vibration pick-up to test out the natural frequency, the vibration shape etc. of girder 5, monitors the kinematic behavior of described girder 5.

On the described drag-line 6 of design appointment, frequency sensor 48 is installed, a drag-line 6 of every replacing forward and backward, and change the pulling force of monitoring drag-line 6 described in those in rope process.Employing is built-in with the double control-type prestress tensioning equipment of pressure transducer and hydraulic cylinder type elongation sensor, when new drag-line 6 that jack tension is changed, is monitored stretching force, the elongation of described drag-line 6 by this double control-type prestress tensioning equipment.On described bridge pier 3 pier shafts, along vertical axis direction, be pasted with foil gauge 46, by strain-gauge test, gone out the strain of bridge pier 3 structures, then by converting, monitor the stress of described bridge pier 3.

(1) make the monitoring scheme of cable-stayed bridge 1 cable replacement engineering, do the preliminary work of cable-stayed bridge 1 cable replacement engineering monitoring;

(2) press the scheme of cable-stayed bridge 1 cable replacement engineering monitoring, on the abutment 2 of cable-stayed bridge 1, bridge pier 3, Sarasota 4, girder 5, drag-line 6, monitoring instrument equipment is installed;

(3) all monitoring instrument equipment is debugged, and drafts out the monitoring prediction scheme that emergency condition occurs when cable-stayed bridge 1 changes rope;

(4) change the stage before rope, the in the situation that of blocking-up traffic and shut-down, periodically operation monitoring instrument and equipment, monitors the center line of the bridge floor of cable-stayed bridge 1, floor elevation, abutment 2 end face absolute altitudes, Sarasota 4 degree of tilt and swing, girder 5 displacements of the lines, girder 5 amounts of deflection, girder 5 cross torsion degree, girder 5 structure angle displacements, girder 5 swings, girder 5 structural stress, girder 5 kinematic behaviors, drag-line 6 pulling force, bridge pier 3 structural stress;

(5) change rope in the stage, the in the situation that of blocking-up traffic, operation monitoring instrument and equipment in real time, during to Sarasota 4 degree of tilt of cable-stayed bridge 1 and swing, girder 5 displacements of the lines, girder 5 amounts of deflection, girder 5 cross torsion degree, girder 5 structure angle displacements, girder 5 swings, drag-line 6 pulling force, drag-line 6 stretch-draw, stretching force and elongation are monitored; And operation monitoring instrument and equipment periodically, the center line of the bridge floor of cable-stayed bridge 1, floor elevation, abutment 2 end face absolute altitudes, girder 5 structural stress, bridge pier 3 structural stress are monitored;

(6) change the stage after rope, the in the situation that of blocking-up traffic and shut-down, periodically operation monitoring instrument and equipment, monitors the center line of the bridge floor of cable-stayed bridge 1, floor elevation, abutment 2 end face absolute altitudes, Sarasota 4 degree of tilt and swing, girder 5 displacements of the lines, girder 5 amounts of deflection, girder 5 cross torsion degree, girder 5 structure angle displacements, girder 5 swings, girder 5 structural stress, girder 5 kinematic behaviors, drag-line 6 pulling force, bridge pier 3 structural stress;

(7) submit Surveillance to, complete the work of cable-stayed bridge 1 cable replacement engineering monitoring.

Cable-stayed bridge 1 is a kind of bridge of large span, and the bridge between its abutment 2 and bridge pier 3 is end bay, the bridge between bridge pier 3 and Sarasota 4 in being time, across, the bridge between two Sarasotas 4, be in across; The effect of abutment 2 is ends of supporting main beam 5, and expansion joint is installed; The effect of bridge pier 3 is at river course intermediate support girder 5; The effect of Sarasota 4 is to hang drag-line 6, and bears the load of girder 5; The effect of girder 5 is bridge span structures, and hangs drag-line 6; The effect of drag-line 6 is bear and transmit girder 5 loads to Sarasota 4; River course 7 was passages of water; The effect of Sarasota rocking test laser beam emitting device I 8 is the laser of using to Sarasota bobbing target point apparatus I 10 launch monitors; The effect of Sarasota rocking test laser beam emitting device II 9 is the laser of using to Sarasota bobbing target point apparatus II 11 launch monitors; The effect of Sarasota bobbing target point apparatus I 10 is inclination, swinging signals that sensing Sarasota 4 tops are longitudinal along bridge, bridge is horizontal; The effect of Sarasota bobbing target point apparatus II 11 is inclination, swinging signals that sensing Sarasota 4 middle parts are longitudinal along bridge, bridge is horizontal; The wind speed and wind aweather effect of frequency recorder 12 is wind speed, wind direction, the wind frequency at monitoring cable-stayed bridge 1 place; The effect of line-stretching photoelectric displacement sensor a13 is along bridge displacement of the lines longitudinally at abutment 2 places monitorings girders 5; The effect of line-stretching photoelectric displacement sensor b14 is along the horizontal displacement of the lines of bridge at abutment 2 place's monitoring girders 5; The effect of line-stretching photoelectric displacement sensor c15 is the displacement of the lines along vertical direction at abutment 2 place's monitoring girders 5; The effect of line-stretching photoelectric displacement sensor d16 is along bridge displacement of the lines longitudinally at bridge pier 3 places monitorings girders 5; The effect of line-stretching photoelectric displacement sensor e17 is along the horizontal displacement of the lines of bridge at bridge pier 3 place's monitoring girders 5; The effect of line-stretching photoelectric displacement sensor f18 is the displacement of the lines along vertical direction at bridge pier 3 place's monitoring girders 5; The effect of line-stretching photoelectric displacement sensor g19 is along bridge displacement of the lines longitudinally at Sarasota 4 places monitorings girders 5; The effect of line-stretching photoelectric displacement sensor h20 is along the horizontal displacement of the lines of bridge at Sarasota 4 place's monitoring girders 5; The effect of line-stretching photoelectric displacement sensor i21 is the displacement of the lines along vertical direction at Sarasota 4 place's monitoring girders 5; Horizontal laser light standard a22 is photoelectric deflection tester of building element a parts, its effect is respectively to measuring point device a25, measuring point device b26, the measuring point device c27 emission level reference laser of photoelectric deflection tester of building element a, to monitor the amount of deflection of girder 5 end bays; Horizontal laser light standard b23 is photoelectric deflection tester of building element b parts, its effect is respectively to measuring point device d28, measuring point device e29, the measuring point device f30 emission level reference laser of photoelectric deflection tester of building element b, with monitor in girder 5 times across amount of deflection; Horizontal laser light standard c24 is photoelectric deflection tester of building element c parts, its effect is respectively to measuring point device g31, measuring point device h32, measuring point device i33, the measuring point device j34 emission level reference laser of photoelectric deflection tester of building element c, with monitor in girder 5 across amount of deflection; The effect of measuring point device a25 is to receive horizontal laser light standard a22 to send horizontal reference laser, tests out girder 5 at the deflection value at 1/4 end bay place; The effect of measuring point device b26 is to receive horizontal laser light standard a22 to send horizontal reference laser, tests out girder 5 at the deflection value at 1/2 end bay place; The effect of measuring point device c27 is to receive horizontal laser light standard a22 to send horizontal reference laser, tests out girder 5 at the deflection value at 3/4 end bay place; The effect of measuring point device d28 is to receive horizontal laser light standard b23 to send horizontal reference laser, test out girder 5 in 1/4 time across the deflection value of locating; The effect of measuring point device e29 is to receive horizontal laser light standard b23 to send horizontal reference laser, test out girder 5 in 1/2 time across the deflection value of locating; The effect of measuring point device f30 is to receive horizontal laser light standard b23 to send horizontal reference laser, test out girder in 3/4 time across the deflection value of locating; The effect of measuring point device g31 is to receive horizontal laser light standard c24 to send horizontal reference laser, test out girder 5 in 1/8 across the deflection value of locating; The effect of measuring point device h32 is to receive horizontal laser light standard c24 to send horizontal reference laser, test out girder 5 in 1/4 across the deflection value of locating; The effect of measuring point device i33 is to receive horizontal laser light standard c24 to send horizontal reference laser, test out girder 5 in 3/8 across the deflection value of locating; The effect of measuring point device j34 is to receive horizontal laser light standard c24 to send horizontal reference laser, test out girder 5 in 1/2 across the deflection value of locating; Level sensing device a35 is the parts of communicating pipe member inclination sensor a, and its effect is the water-head that tests out abutment 2 place's girder 5 both sides, to monitor the cross torsion degree of this place's girder 5; Level sensing device b36 is the parts of communicating pipe member inclination sensor a, and its effect is the water-head that tests out girder 5 both sides, bridge end bay span centre place, to monitor the cross torsion degree of this place's girder 5; Level sensing device c37 is the parts of communicating pipe member inclination sensor c, and its effect is the water-head that tests out bridge pier 3 place's girder 5 both sides, to monitor the cross torsion degree of this place's girder 5; Level sensing device d38 is the parts of communicating pipe member inclination sensor d, and its effect is the water-head testing out in bridge time across girder 5 both sides, span centre place, to monitor the cross torsion degree of this place's girder 5; Level sensing device e39 is the parts of communicating pipe member inclination sensor e, and its effect is the water-head that tests out Sarasota 4 place's girder 5 both sides, to monitor the cross torsion degree of this place's girder 5; Level sensing device f40 is the parts of communicating pipe member inclination sensor f, and its effect is the water-head testing out in bridge across girder 5 both sides, span centre place, to monitor the cross torsion degree of this place's girder 5; The effect of communicating pipe 41 is that the water in two level sensing devices of communicating pipe member inclination sensor is communicated with; The effect of arm-type angular displacement sensor 42 is angular deflections of monitoring girder 5 structures; The effect of three-dimensional oscillating sensor a43 is that monitoring abutment 2 place's girders 5 are longitudinal along bridge, bridge is horizontal, Oscillation Amplitude and frequency in vertical three directions; The effect of three-dimensional oscillating sensor b is that monitoring bridge end bay span centre place girder 5 is longitudinal along bridge, bridge is horizontal, Oscillation Amplitude and frequency in vertical three directions; The effect of three-dimensional oscillating sensor c44 is that monitoring bridge pier 3 place's girders 5 are longitudinal along bridge, bridge is horizontal, Oscillation Amplitude and frequency in vertical three directions; The effect of three-dimensional oscillating sensor d is Oscillation Amplitude and the frequency across span centre place girder 5 is longitudinal along bridge, bridge is horizontal, in vertical three directions in monitoring time; The effect of three-dimensional oscillating sensor e45 is that monitoring Sarasota 4 place's girders 5 are longitudinal along bridge, bridge is horizontal, Oscillation Amplitude and frequency in vertical three directions; The effect of three-dimensional oscillating sensor f is that in monitoring, spanning span centre place girder 5 is longitudinal along bridge, bridge is horizontal, Oscillation Amplitude and frequency in vertical three directions; The effect of foil gauge 46 is the stress of monitoring girder, bridge pier structure; The effect of vibro-pickup 47 is the vibration shape, the amplitude of monitoring girder 5, the kinematic behavior frequently of shaking; The effect of frequency sensor 48 is vibration frequencies of monitoring drag-line 6, after converting, draws the pulling force that drag-line 6 is suffered; The effect of double control-type prestress tensioning equipment is while changing drag-line, to monitor cable tension power, elongation.

Claims

1. an instrument and equipment for cable-stayed bridge cable replacement engineering monitoring, is characterized in that: the abutment that includes described cable-stayed bridge, bridge pier, Sarasota, girder, drag-line, adopts transit, spirit-leveling instrument, Sarasota rocking test laser beam emitting device I, Sarasota rocking test laser beam emitting device II, Sarasota bobbing target point apparatus I, Sarasota bobbing target point apparatus II, wind speed and wind is frequency recorder aweather, line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c, line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f, line-stretching photoelectric displacement sensor g, line-stretching photoelectric displacement sensor h, line-stretching photoelectric displacement sensor i, the horizontal laser light standard a of photoelectric deflection tester of building element a, measuring point device a, measuring point device b, measuring point device c, the horizontal laser light standard b of photoelectric deflection tester of building element b, measuring point device d, measuring point device e, measuring point device f, the horizontal laser light standard c of photoelectric deflection tester of building element c, measuring point device g, measuring point device h, measuring point device i, measuring point device j, level sensing device a and the communicating pipe of communicating pipe member inclination sensor a, level sensing device b and the communicating pipe of communicating pipe member inclination sensor b, level sensing device c and the communicating pipe of communicating pipe member inclination sensor c, level sensing device d and the communicating pipe of communicating pipe member inclination sensor d, level sensing device e and the communicating pipe of communicating pipe member inclination sensor e, level sensing device f and the communicating pipe of communicating pipe member inclination sensor f, arm-type angular displacement sensor, three-dimensional oscillating sensor a, three-dimensional oscillating sensor b, three-dimensional oscillating sensor c, three-dimensional oscillating sensor d, three-dimensional oscillating sensor e, three-dimensional oscillating sensor f, foil gauge, vibro-pickup, the instrument and equipment of frequency sensor is monitored, and described cable-stayed bridge is quoted measurement net and the leveling point of the earth, to its bridge floor center line, floor elevation, abutment absolute altitude is monitored, at the abutment of the left half-bridge of described cable-stayed bridge and right half-bridge, bridge pier, Sarasota, girder, monitoring instrument equipment on drag-line, and the installation site of those instrument and equipments is all identical.

2. the instrument and equipment that cable-stayed bridge cable replacement engineering is monitored according to claim 1, it is characterized in that: the upstream side in described Sarasota bottom is provided with Sarasota rocking test laser beam emitting device I, Sarasota bobbing target point apparatus I is installed in the upstream side at described Sarasota top, downstream in described Sarasota bottom is provided with Sarasota rocking test laser beam emitting device II, in the downstream side at described Sarasota middle part, Sarasota bobbing target point apparatus II is installed, described Sarasota rocking test laser beam emitting device I is aimed at Sarasota bobbing target point apparatus I Emission Lasers, monitor described Sarasota top longitudinal along bridge, the degree of tilt that bridge is horizontal and swing, described Sarasota rocking test laser beam emitting device II is aimed at Sarasota bobbing target point apparatus II Emission Lasers, monitor described Sarasota middle part is longitudinal along bridge, bridge is horizontal degree of tilt and swing, in addition, observation station at cable-stayed bridge described in two sides, adopt transit to check the degree of tilt of the described Sarasota of monitoring, aweather frequency recorder of wind speed and wind is installed at the top of described Sarasota, monitors the suffered wind speed of described cable-stayed bridge, wind direction, wind frequency.

3. the instrument and equipment that cable-stayed bridge cable replacement engineering is monitored according to claim 1, it is characterized in that: line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c are installed on the platform cap of described abutment, the bracing wire hook of described line-stretching photoelectric displacement sensor a, line-stretching photoelectric displacement sensor b, line-stretching photoelectric displacement sensor c, be hung on three links of described Abutment girder bottom surface, monitor successively that described girder is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f are installed on the pier shaft of described bridge pier, the bracing wire hook of described line-stretching photoelectric displacement sensor d, line-stretching photoelectric displacement sensor e, line-stretching photoelectric displacement sensor f, be hung on three links of girder bottom surface, described bridge pier place, monitor successively that described girder is longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, line-stretching photoelectric displacement sensor g is installed on the tower body of described Sarasota, line-stretching photoelectric displacement sensor h, line-stretching photoelectric displacement sensor i, described line-stretching photoelectric displacement sensor g, line-stretching photoelectric displacement sensor h, the bracing wire hook of line-stretching photoelectric displacement sensor i, be hung on three links of girder bottom surface, described Sarasota place, monitor successively described girder longitudinal along bridge at this place, bridge is horizontal, the displacement of the lines of vertical three directions, the horizontal laser light standard a of photoelectric deflection tester of building element a is installed in the downstream of described abutment abutment body, 1/4 end bay in described girder bottom surface along bridge center line, 1/2 end bay, 3/4 end bay place, the measuring point device a of described photoelectric deflection tester of building element a is installed successively, measuring point device b, measuring point device c, three generating lasers of described horizontal laser light standard a, aim at respectively described measuring point device a, measuring point device b, measuring point device c sends the laser of level, monitor the amount of deflection of described cable-stayed bridge end bay girder, the horizontal laser light standard b of photoelectric deflection tester of building element b is installed in the downstream of described bridge pier pier shaft, in described girder bottom surface along in 1/4 time of bridge center line across, in 1/2 time across, in 3/4 time across locating, measuring point device d, measuring point device e, the measuring point device f of described photoelectric deflection tester of building element b are installed successively, three generating lasers of described horizontal laser light standard b, aim at respectively described measuring point device d, measuring point device e, the laser that measuring point device f sends level, monitor in described cable-stayed bridge time the amount of deflection across girder, the horizontal laser light standard c of photoelectric deflection tester of building element c is installed in the downstream of described Sarasota tower body, described girder bottom surface along bridge center line 1/8 in across, in 1/4 across, in 3/8 across, in 1/2 across locating, the measuring point device g of described photoelectric deflection tester of building element c is installed successively, measuring point device h, measuring point device i, measuring point device j, four generating lasers of described horizontal laser light standard c, aim at respectively described measuring point device g, measuring point device h, measuring point device i, measuring point device j sends the laser of level, monitor in described cable-stayed bridge half amount of deflection across girder, communicating pipe member inclination sensor a is installed in the bottom of girder described in Abutment, two level sensing device a of described communicating pipe member inclination sensor a, be arranged on respectively on two sides of described girder, described in Abutment, on girder bottom surface, there iing communicating pipe, this communicating pipe is communicated with the level sensing device a described in two, two described level sensing device a and fill with water in communicating pipe, the cross torsion degree of girder described in monitoring Abutment, the bottom of stating girder in bridge end bay span centre place is provided with communicating pipe member inclination sensor b, two level sensing device b of described communicating pipe member inclination sensor b, be arranged on respectively on two sides of described girder, in bridge end bay span centre place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device b described in two, two described level sensing device b and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring bridge end bay span centre place, the bottom of stating girder in bridge pier place is provided with communicating pipe member inclination sensor c, two level sensing device c of described communicating pipe member inclination sensor c, be arranged on respectively on two sides of described girder, in bridge pier place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device c described in two, two described level sensing device c and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring bridge pier place, the bottom of stating girder across span centre place in bridge time is provided with communicating pipe member inclination sensor d, two level sensing device d of described communicating pipe member inclination sensor d, be arranged on respectively on two sides of described girder, in bridge is inferior, across span centre place, states on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device d described in two, two described level sensing device d and fill with water in communicating pipe, state the cross torsion degree of girder across span centre place in monitoring bridge time, the bottom of stating girder in Sarasota place is provided with communicating pipe member inclination sensor e, two level sensing device e of described communicating pipe member inclination sensor e, be arranged on respectively on two sides of described girder, in Sarasota place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device e described in two, two described level sensing device e and fill with water in communicating pipe, the cross torsion degree of girder is stated in monitoring Sarasota place, the bottom of stating girder across span centre place in bridge is provided with communicating pipe member inclination sensor f, two level sensing device f of described communicating pipe member inclination sensor f, be arranged on respectively on two sides of described girder, in bridge, across span centre place, state on girder bottom surface and have communicating pipe, this communicating pipe is communicated with the level sensing device f described in two, two described level sensing device f and fill with water in communicating pipe, in monitoring bridge, across span centre place, state the cross torsion degree of girder, abutment at described cable-stayed bridge, end bay span centre, bridge pier, in inferior across span centre, Sarasota, in across there being two arm-type angular displacement sensors in span centre place girder cross-sectional configuration, these two described arm-type angular displacement sensors are placed in respectively on the web of both sides, described girder transversal section, the roller of described arm-type angular displacement sensor is resisted against the top board of described girder transversal section, monitor the angular displacement of described girder cross-sectional configuration, three-dimensional oscillating sensor a is installed on the base plate in girder described in Abutment, the center line of described three-dimensional oscillating sensor a is parallel with bridge center line, described in monitoring Abutment, girder is longitudinal along bridge, bridge is horizontal, the amplitude swinging in vertical three directions, frequency, in bridge end bay span centre place, state three-dimensional oscillating sensor b is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor b is parallel with bridge center line, amplitude, frequency that monitoring bridge end bay span centre place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge pier place, state three-dimensional oscillating sensor c is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor c is parallel with bridge center line, amplitude, frequency that monitoring bridge pier place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge time, across span centre place, state three-dimensional oscillating sensor d is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor d is parallel with bridge center line, amplitude, the frequency in monitoring bridge time, across span centre place, stating that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in Sarasota place, state on the base plate in girder three-dimensional oscillating sensor e is installed, the center line of described three-dimensional oscillating sensor e is parallel with bridge center line, amplitude, frequency that monitoring Sarasota place states that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in bridge, across span centre place, state three-dimensional oscillating sensor f is installed on the base plate in girder, the center line of described three-dimensional oscillating sensor f is parallel with bridge center line, amplitude, the frequency in monitoring bridge, across span centre place, stating that girder is longitudinal along bridge, bridge is horizontal, swing in vertical three directions, in abutment, 1/4 end bay, 1/2 end bay, 3/4 end bay, bridge pier, 1/4 time across, in 1/2 time across, in 3/4 time across in, Sarasota, 1/8 across, in 1/4 across, in 3/8 across, across place, state on the upper and lower edge of girder in 1/2, along bridge center line, be pasted with foil gauge, by strain-gauge test, gone out the strain of main beam structure, by converting, monitor the stress of described main beam structure again, on the bridge floor of described cable-stayed bridge, parallel bridge center line is equidistantly mounted with several vibro-pickups, adopts vibration pick-up to test out the natural frequency, the vibration shape etc. of girder, monitors the kinematic behavior of described girder.

4. the instrument and equipment that cable-stayed bridge cable replacement engineering is monitored according to claim 1, it is characterized in that: on the described drag-line of design appointment, frequency sensor is installed, before a drag-line of every replacing, after, and change the pulling force of monitoring drag-line described in those in rope process, employing is built-in with the double control-type prestress tensioning equipment of pressure transducer and hydraulic cylinder type elongation sensor, when new drag-line that jack tension is changed, by this double control-type prestress tensioning equipment, monitored the stretching force of described drag-line, elongation, on described bridge pier pier shaft, along vertical axis direction, be pasted with foil gauge, by strain-gauge test, gone out the strain of bridge pier structure, again by converting, monitor the stress of described bridge pier.

5. a method for cable-stayed bridge cable replacement engineering monitoring, carries out successively according to the following steps, it is characterized in that: