CN-122014976-A - Three-dimensional displacement measuring device for new and old spliced wide joints of fabricated beam bridge

CN122014976ACN 122014976 ACN122014976 ACN 122014976ACN-122014976-A

Abstract

The invention discloses a three-dimensional displacement measuring device for new and old spliced wide joints of an assembled beam bridge, which belongs to the technical field of bridge structure detection and comprises a single-degree-of-freedom displacement meter, a fixing assembly, an acquisition instrument and a data transmission link, wherein the single-degree-of-freedom displacement meter is obliquely arranged across and fixed on new and old beam bodies on two sides of a wet joint through the fixing assembly, initial distances are reserved between two end points of the single-degree-of-freedom displacement meter in the x direction, the y direction and the z direction, and the device derives three-dimensional relative displacement indirectly through unidirectional length change based on local micro deformation characteristics of the 50cm range around the wet joint. The three-dimensional displacement measuring device for the new and old spliced wide joints of the assembled beam bridge solves the problems of complex installation, high cost, poor adaptability, insufficient data transmission stability, low control precision of vertical initial height difference and the like in the existing three-dimensional displacement measuring device for the new and old spliced wide joints of the assembled beam bridge.

Inventors

ZHANG YUEFENG
QIAO PAN
Fan Haojia
LIU PENGCHONG
DAN DANHUI
LI HONGXING
WANG LIANG
MA YONGGANG
ZHANG NAIQI
Zhao Zhice
DENG NAN
LI YIFEI

Assignees

沧州交通发展(集团)有限责任公司
河北交规院瑞志交通技术咨询有限公司
同济大学

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (9)

1. A three-dimensional displacement measuring device for an assembled beam bridge new and old spliced wide seam is characterized by comprising a single-degree-of-freedom displacement meter, a fixing assembly, an acquisition instrument and a data transmission link, wherein the fixing assembly comprises a high-strength anchoring piece, an adjusting nut and a spherical hinge structure, the adjusting nut is screwed into an embedded steel bar of a side beam body in advance to form a preset z-direction initial height difference, the single-degree-of-freedom displacement meter is obliquely spanned and fixed on the new and old beam bodies on two sides of a wet seam through the fixing assembly, initial distances are reserved between two end points of the single-degree-of-freedom displacement meter in the x direction, the y direction and the z direction, the data transmission link is used for uploading measurement data of the single-degree-of-freedom displacement meter to a remote server, and the device is used for indirectly deducing three-dimensional relative displacement through single-direction length change based on local micro deformation characteristics within a range of 50cm around the wet seam.
2. The three-dimensional displacement measuring device for the new and old spliced wide joints of the assembled beam bridge is characterized in that the adjusting nut is an M16 high-precision nut, and the anchoring pieces on two sides of the wet joint form a preset initial z-direction distance by adjusting the screwing height of the adjusting nut on the embedded steel bars, wherein the adjusting precision is less than or equal to +/-1 mm.
3. The three-dimensional displacement measuring device for the new and old spliced wide joints of the fabricated beam bridge is characterized in that the model of the high-strength anchoring piece is M16, the material is 45 steel, one end of the anchoring piece is mechanically connected with embedded bars of the new and old beam bodies, and the other end of the anchoring piece is hinged with the end points of the single-degree-of-freedom displacement meter through a spherical hinge structure, so that the single-degree-of-freedom displacement meter can synchronously displace along with the deformation of the beam bodies.
4. The three-dimensional displacement measuring device for new and old spliced wide joints of an assembled beam bridge according to claim 1, wherein the installation direction of the single-degree-of-freedom displacement meter is defined by a spherical coordinate initial parameter, and the spherical coordinate initial parameter comprises a horizontal rotation angle Vertical corner Initial length The parameters are recorded during installation and stored in an acquisition instrument for deducing the three-dimensional relative displacement.
5. The three-dimensional displacement measuring device for the new and old spliced wide joints of the assembled beam bridge, which is disclosed in claim 1, is characterized in that the single-degree-of-freedom displacement meter is a pull-wire displacement meter, the measuring range is +/-5 mm, and the precision is 0.01mm.
6. The three-dimensional displacement measuring device for the new and old spliced wide seams of the fabricated beam bridge according to claim 1, wherein the diameter of the embedded bars is 14-16mm, the exposed length is 13-15cm, and the verticality deviation after being implanted into the beam body is less than or equal to 0.5 degrees.
7. The three-dimensional displacement measuring device for the new and old spliced wide joints of the fabricated beam bridge according to claim 1, wherein the data transmission link comprises a shielding cable, a secondary cable and a 4G network link, measurement data of the single-degree-of-freedom displacement meter are transmitted to the acquisition instrument through the shielding cable, and the acquisition instrument uploads the data to the remote server database through the secondary cable or the 4G wireless module.
8. The three-dimensional displacement measuring device for the new and old spliced wide joints of the fabricated beam bridge is characterized in that the collecting instrument is a waterproof collecting instrument with the sampling frequency of 1Hz, an offline buffer module is integrated, missing data is automatically fed back after network recovery, and the collecting instrument is powered by a 220V alternating current power supply or a solar panel.
9. The three-dimensional displacement measuring device for the new and old spliced wide joints of the fabricated beam bridge, which is disclosed in claim 1, is characterized in that the device is suitable for scene quantities with negligible deformation of a body of 50cm Fan Weiliang around a wet joint, the horizontal rotation angle change delta theta, the vertical rotation angle change delta phi and the length change delta l of a single-degree-of-freedom displacement meter are tiny quantities in the operation period, and the change direction of delta l is consistent with the initial installation direction of the single-degree-of-freedom displacement meter.

Description

Three-dimensional displacement measuring device for new and old spliced wide joints of fabricated beam bridge Technical Field The invention relates to the technical field of bridge monitoring structures, in particular to a three-dimensional displacement measuring device for new and old spliced wide joints of an assembled girder bridge. Background In the traffic infrastructure upgrading and reconstruction engineering, the fabricated beam bridge is widely applied to bridge widening and reconstruction projects due to the advantages of high construction efficiency, easy quality control and the like. The joint parts of the new and old beams are commonly stressed cooperatively by adopting a wet joint structure, and the three-dimensional relative displacement (including transverse (bridge cross section direction), longitudinal (bridge span direction) and vertical displacement) of the joint area is a core index reflecting the cooperative working performance of the new and old beams and evaluating the operation safety of the structure. During operation, the bridge is influenced by various factors such as temperature alternation, uneven settlement of foundation, repeated action of vehicle load and the like, and the new Liang Tiyi and the old Liang Tiyi at two sides of the wet joint are deformed relatively. If the displacement exceeds the design allowable range, potential safety hazards such as wet joint cracking, steel bar corrosion and even new and old beam body detachment are possibly caused, so that the three-dimensional displacement of the wet joint area needs to be monitored accurately for a long time. At present, the main stream in the field of bridge three-dimensional displacement monitoring adopts a multi-sensor orthogonal arrangement technical scheme, namely, independent displacement meters are respectively arranged in the three orthogonal directions of x, y and z, and three-dimensional displacement measurement is realized by collecting a plurality of groups of unidirectional displacement data and splicing and integrating the unidirectional displacement data. However, when the scheme is applied to the monitoring of the new and old splicing width joints of the assembled beam bridge, the following significant defects exist: The wet joint width is only 20-50cm, the space is extremely narrow, a plurality of mounting points are reserved on the new and old beam bodies in the orthogonal arrangement of the multiple sensors, the interference with site construction is easy to generate, the mounting and calibration flow of the multiple sensors is complex, and the multiple sensors are difficult to adapt to the construction environment in a narrow space; The cost and the precision contradict that the multi-sensor configuration leads to the remarkable increase of hardware purchase cost and field wiring cost, and simultaneously, the response speed difference of different sensors is easy to generate synchronous errors, and the errors can be accumulated in the data splicing process to influence the overall precision of three-dimensional displacement measurement; the scene adaptability is poor, namely, an installation error inevitably exists in the construction process of the new and old beam bodies, the sensor which is arranged in an orthogonal way is easy to deviate from the actual displacement direction of the beam bodies due to the deviation of the initial installation position, and the actual displacement state cannot be accurately captured; the data transmission stability is insufficient, the data transmission of the traditional monitoring device is mostly dependent on a single wired link, the bridge operation environment is complex, the cable is easily damaged due to the influences of vibration, corrosion, external force collision and the like, the data transmission is interrupted, and the monitoring continuity cannot be ensured. Therefore, there is a need for a low cost, highly adaptable three-dimensional displacement measurement device suitable for use in fabricated bridge new and old splice width joints. Disclosure of Invention The invention aims to provide a three-dimensional displacement measuring device for an assembly type bridge new and old splicing wide seam, which solves the problems of complex installation, high cost, poor adaptability, insufficient data transmission stability, low control precision of a vertical initial height difference and the like in the monitoring of the assembly type bridge new and old splicing wide seam of the existing three-dimensional displacement measuring device. The invention provides a three-dimensional displacement measuring device for an assembly type beam bridge new and old spliced wide seam, which comprises a single-degree-of-freedom displacement meter, a fixing assembly, an acquisition instrument and a data transmission link, wherein the fixing assembly comprises a high-strength anchoring piece, an adjusting nut and a spherical hinge structure, the adjusting nut is screwed