CN117344655A - Pushing method for variable curvature curve bridge - Google Patents
Pushing method for variable curvature curve bridge Download PDFInfo
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- CN117344655A CN117344655A CN202311522848.6A CN202311522848A CN117344655A CN 117344655 A CN117344655 A CN 117344655A CN 202311522848 A CN202311522848 A CN 202311522848A CN 117344655 A CN117344655 A CN 117344655A
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- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000012937 correction Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 210000001503 joint Anatomy 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 29
- 238000012795 verification Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention discloses a pushing method of a variable curvature curve bridge, which comprises the following steps: s1, longitudinally pushing the precast beam in the forward pushing direction and correcting the deviation of the precast beam in the transverse direction in real time until the estimated distance of the butt joint end between the precast beam and the built beam is pushed out, and taking the estimated distance as the reverse pushing distance; s2, calculating a shot image of the high-definition camera through an image processing technology to obtain a reverse pushing distance and a deviation correcting angle; s3, according to the measurement result, carrying out longitudinal pushing and transverse deviation correction on the precast beam in the reverse pushing direction until the precast Liang Fanxiang is pushed to the designated position and completing beam falling operation. According to the method for combining forward pushing construction with reverse pushing construction, the safety distance between the variable curvature curve precast beam and the pushing platform in the pushing process is effectively ensured, and the accurate pushing construction of the variable curvature curve precast beam is effectively ensured.
Description
Technical Field
The invention belongs to the technical field of bridge and road construction, and particularly relates to a pushing method of a variable curvature curve bridge.
Background
The pushing construction method is a construction method that a beam body is poured or assembled on a road embankment behind an abutment section by section, and is longitudinally pushed by a pushing device, so that the beam body is positioned by a temporary sliding device at the top of each pier. The pushing construction does not affect the traffic under the bridge, does not need large-scale hoisting equipment or high-altitude operation, and is particularly suitable for the construction of urban bridges, ultra-large span bridges, long-line bridge approach or three-dimensional intersection. The pushing method construction does not need a bracket and a large machine, the engineering quality is easy to control, the occupied space is small, and the construction is not affected by seasons. However, the existing pushing construction method is mostly used for straight bridges with equal height or curve bridges with equal radius, and the research on the pushing construction of the variable curvature curve bridges is less.
The pushing construction method aiming at the variable curvature curve bridge is mainly implemented by methods of reducing pushing span, adjusting temporary pier elevation and the like at present, but the methods have high construction cost, high difficulty and high workload.
Disclosure of Invention
In order to overcome the defects existing in the prior art, the invention aims to provide a pushing method of a variable curvature curve bridge.
The invention is realized in this way, a pushing method of a curvature-variable curve bridge, the method is to take the built beam as the relative position coordinate, the pushing device is controlled by the control source to finish the pushing movement operation of the precast beam, the pushing movement operation includes the longitudinal pushing movement operation along the longitudinal slideway movement of the pushing device, the transverse pushing movement operation of the transverse slideway movement, the built beam butt end is provided with a high definition camera, the precast beam is a curvature-variable curve precast beam, the precast beam butt end is provided with a ranging mark serving as a shooting datum point of the high definition camera, the pushing device also includes a transverse deviation rectifying component used for performing the transverse deviation rectifying operation, the transverse deviation rectifying component includes a rotary pillar and a cushion block fixed on the rotary pillar and serving as a contact surface of the precast beam bottom;
the method is a method for processing and analyzing a photographed image of a high-definition camera through a control source and controlling pushing movement operation and transverse deviation correction operation of a pushing device according to a processing and analyzing result, and specifically comprises the following steps:
s1, in the forward pushing direction, longitudinally pushing the precast beam and transversely rectifying deviation of the precast beam in real time until the estimated distance of the butt joint end between the precast beam and the built beam is pushed out, and taking the estimated distance as the reverse pushing distance;
s2, calculating a shot image of the high-definition camera through an image processing technology to obtain a reverse pushing distance and a deviation correcting angle;
s3, according to the measurement result, carrying out longitudinal pushing and transverse deviation correction on the precast beam in the reverse pushing direction until the precast Liang Fanxiang is pushed to the designated position and completing beam falling operation.
Preferably, in step S1, the transverse deviation correcting of the real-time precast beam includes the following steps: and shooting pushing videos by the high-definition camera and transmitting the pushing videos to a control source in real time, monitoring the contact area between the precast beam and the cushion block by the control source in real time based on a YOLOv7 algorithm, and restraining the longitudinal slide way to open the transverse slide way simultaneously when the contact area between the precast beam and the cushion block is about to be reduced, and performing transverse deviation correcting operation on the precast beam by transverse pushing.
Preferably, in step S1, the step of correcting the transverse deviation of the real-time precast beam further includes the steps of: when the contact surface is detected to be positioned at the central axis position of the precast beam based on the YOLOv7 algorithm, the transverse slideway is restrained, the longitudinal slideway is opened at the same time, and the longitudinal pushing is continuously carried out in the forward pushing direction.
Preferably, in step S1, the distance is the distance between the high-definition camera and the ranging mark on the butt end of the precast beam; wherein the estimated distance is 1/10 of the total length of the precast beam.
Preferably, in step S2, the reverse pushing distance is a horizontal distance between the high-definition camera and the ranging mark.
Preferably, step S3 comprises the following specific steps:
s31: according to the reverse pushing distance and the transverse deviation correcting angle, transversely pushing the precast beam and transversely correcting the deviation;
s32: after the transverse deviation correction is completed according to the preset angle, verifying the deviation correction result by a high-definition camera, and storing the verification result and error;
s33: longitudinally pushing the precast beam, after pushing according to a preset distance, verifying a longitudinal pushing result by a high-definition camera, and storing a verification result and an error;
s34: and repeating the steps S31-S33 until the precast beam reaches the designated position and the beam falling operation is completed.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
(1) In the invention, the longitudinal pushing and the transverse pushing movement operation processes of the pushing device are mutually independent and do not interfere with each other, and the transverse deviation correcting component can be matched with the transverse pushing movement operation to perform angle rotation or adjustment of the precast beam so as to realize the transverse deviation correcting operation of the precast beam in the pushing process, thereby being suitable for pushing construction of the bridge with a variable curvature curve;
(2) According to the method, by combining forward pushing construction with reverse pushing construction, the safety distance between the variable curvature curve prefabricated beam and the built beam in the pushing process is effectively ensured, and the accurate pushing construction of the variable curvature curve bridge is effectively ensured;
(3) According to the invention, the image is acquired through the high-definition camera and is processed based on the image processing technology, wherein the processing is performed to obtain the contact area of the slideway and the precast beam, so that the safety monitoring and the safety control can be performed in the longitudinal pushing construction process, the processing is performed to obtain the reverse pushing distance and the deviation correcting angle, and accurate construction data can be provided for the reverse pushing construction step.
Drawings
FIG. 1 is a schematic view of the structure of the pushing device of the present invention; the device comprises a 1-support, a 2-vertical jack, a 3-vertical pushing platform, a 4-liftable slideway, a 5-polytetrafluoroethylene plate, a 6-horizontal pushing platform, a 7-transverse jack, an 8-longitudinal jack, a 9-rotary support, a 10-cushion block and an 11-central control platform;
FIG. 2 is a flow chart of the steps of the method of the present invention;
FIG. 3 is a schematic diagram of the ranging analysis principle based on the image processing technology of the present invention;
fig. 4 is a schematic diagram of a distance calculation principle between a high-definition camera and a distance measurement mark according to the invention;
fig. 5 is a schematic diagram of the measurement principle of the transverse deviation correcting angle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention discloses a pushing method of a variable curvature curve bridge, which is characterized in that a built beam is used as a relative position coordinate, a control source is used for controlling a pushing device to complete pushing movement operation of a precast beam, and the pushing movement operation comprises longitudinal pushing movement operation along a longitudinal slideway of the pushing device and transverse pushing movement operation along a transverse slideway.
The pushing device of the invention has a specific structure shown in figure 1, and specifically comprises: the vertical pushing platform 3, vertical jack 2 is installed at the bottom of vertical pushing platform 3, support 1 is fixed at the bottom of vertical jack 2, polytetrafluoroethylene plate 5 with small friction coefficient with the bridge contact surface is arranged on vertical pushing platform 3, liftable slideway 4 is composed of transverse slideway in X-axis direction and longitudinal slideway in Y-axis direction, vertical pushing platform 3 is internally provided with central control platform 11 for controlling the restraint of transverse slideway and longitudinal slideway to lift, horizontal pushing platform 6 is arranged on transverse slideway and longitudinal slideway, transverse jack 7 is arranged on the X-axis side of horizontal pushing platform 6, and longitudinal jack 8 is arranged on the Y-axis side.
In the embodiment of the invention, the pushing device is positioned between the precast beam and the pier, and the support 1 of the pushing device is fixed on the pier. The built beam refers to a bridge section on a bridge pier to finish construction, and the built beam can be a built straight bridge section, a curve bridge section with equal radius or a curve bridge section with variable curvature.
In the embodiment of the invention, the central control platform 11 is used for controlling the restraint of the transverse slide ways and the longitudinal slide ways to lift and controlling the cooperation of the transverse jack 7 and the longitudinal jack 8, specifically, in transverse pushing, the longitudinal slide way restraint is lifted to limit the movement of the horizontal pushing platform 6 on the longitudinal slide ways (namely, the longitudinal slide way restraint), and meanwhile, the horizontal pushing platform 6 is pushed to move along the transverse slide ways through the transverse jack 7 after falling down the transverse slide way restraint (namely, the transverse slide way is opened). Similarly, in the longitudinal pushing, the transverse slideway restraint is lifted to limit the movement of the horizontal pushing platform 6 on the transverse slideway (namely the transverse slideway restraint), and the horizontal pushing platform 6 is pushed to move along the longitudinal slideway through the longitudinal jack 8 after falling down the longitudinal slideway restraint (namely the longitudinal slideway is opened).
In the embodiment of the invention, the transverse pushing means that the vertical jack 2 ascends to prefabricate Liang Dingqi in the vertical direction of the central axis at the current contact position of the transverse slideway and the precast beam, the transverse jack 7 pushes the horizontal pushing platform 6 to move a certain distance along the transverse slideway under the condition that the longitudinal slideway is restrained and the transverse slideway is opened, the vertical jack 2 returns to be separated from contact with the precast beam, the horizontal pushing platform 6 returns, and the process is repeated to enable the precast beam to transversely move to the designated position; it is easy to understand that the lateral pushing is a cooperative operation process of all pushing devices at the bottom of the precast beam. The longitudinal pushing is that the vertical jack 2 ascends to prefabricate Liang Dingqi in the direction parallel to the central axis of the current contact position of the longitudinal slideway and the precast beam, and under the condition that the transverse slideway is restrained and the longitudinal slideway is opened, the longitudinal jack 8 pushes the horizontal pushing platform 6 to move a certain distance along the longitudinal slideway, the vertical jack 2 returns to be separated from contact with the precast beam, and the horizontal pushing platform 6 returns; repeating the process to enable the precast beam to longitudinally move to a designated position; it is easy to understand that longitudinal pushing is the synchronous operation process of all pushing devices at the bottom of the precast beam.
The pushing device in the embodiment of the invention is similar to the pushing device in the prior art in structure and working principle. However, unlike the prior art, in order to be suitable for the pushing operation of the variable curvature curve bridge, the present invention improves the existing pushing device and is matched with an imaging unit for providing an image source, specifically, in the embodiment of the present invention, a high definition camera is arranged on the abutting end of the built beam, a ranging mark serving as a shooting datum point of the high definition camera is arranged on the abutting end of the prefabricated beam, and the pushing device comprises a transverse deviation rectifying member for performing the transverse deviation rectifying operation, wherein the transverse deviation rectifying member comprises a rotating support column 9 and a cushion block 10 fixed on the rotating support column 9 and serving as a contact surface of the bottom of the prefabricated beam.
In the embodiment of the invention, the transverse deviation rectifying component is mainly used for matching and completing transverse deviation rectifying (or transverse pushing deviation rectifying) operation, wherein transverse deviation rectifying means that in the process of carrying out transverse pushing movement operation on each pushing device at the bottom of the precast beam, the angle adjustment of the precast beam is achieved by controlling different transverse pushing distances of each pushing device at the bottom of the precast beam and matching with the transverse deviation rectifying component in each pushing device.
In the embodiment of the invention, the central control source can also be expressed as a PC end processor and the like, and the functions of the central control source are mainly expressed in the following steps: (1) Processing and analyzing the shot image of the high-definition camera to obtain the contact area and the contact position of the cushion block 10 and the precast beam, and obtain the information such as the reverse pushing distance, the deviation correcting angle and the like; (2) Controlling the pushing device according to the information generation instruction, for example, when the precast beam needs to be pushed longitudinally, remotely transmitting the instruction to a built-in central control platform 11 of the pushing device through a control source so as to open a longitudinal slideway and restrict a transverse slideway; when the precast beam is pushed transversely, a remote instruction of a control source is sent to the built-in central control platform 11 to open the transverse slideway and restrict the longitudinal slideway.
Specifically, as shown in fig. 2, the method of the present invention is a method for processing and analyzing a photographed image of a high-definition camera by a control source and controlling pushing movement operation and transverse deviation correction operation of a pushing device according to a processing and analyzing result, and specifically includes the following steps:
s1, in the forward pushing direction, longitudinally pushing the precast beam and transversely rectifying deviation of the precast beam in real time until the estimated distance of the butt joint end between the precast beam and the built beam is pushed out, and taking the estimated distance as the reverse pushing distance.
In the embodiment of the invention, the forward pushing direction refers to the direction that the butt end of the precast beam is far away from the butt end of the built beam, and the reverse pushing direction refers to the direction that the butt end of the precast beam is close to the butt end of the built beam.
In step S1, first, a longitudinal pushing is performed, and then, a real-time transverse deviation correction of the precast beam is performed, where the real-time transverse deviation correction of the precast beam includes the following steps: in the longitudinal pushing process, a pushing video is shot by the high-definition camera and transmitted to a control source in real time, the control source monitors the contact area between the precast beam and the cushion block 10 in real time by using a YOLOv7 algorithm (cited in YOLOv7: trainerable bag-of-freebies sets new state-of-the-art for real-time object detectors), when the contact area between the precast beam and the cushion block 10 is about to be reduced, the precast beam is restrained from a longitudinal slideway and an open transverse slideway, the precast beam is lifted by using the vertical jack 2, the precast beam is stressed by contacting the cushion block 10 with the precast beam, the precast beam is pushed transversely by the pushing device, and meanwhile, the support and the angle adjustment are provided by the rotary support 9, so that the transverse deviation rectifying operation of the precast beam is completed.
In the process of the transverse deviation correcting operation, in order to avoid potential safety hazards in the moving process of the transverse deviation correcting, in the embodiment of the invention, a control source monitors the transverse deviation correcting operation process in real time through a high-definition camera, and the coordinate position of the pushing device is compared with the relative position of the precast beam to obtain the contact surface position of the cushion block 10 and the precast beam; when the contact surface is detected to be positioned at the central axis position of the precast beam based on the YOLOv7 algorithm, a remote instruction of a control source is sent to the built-in central control platform 11 to restrain the transverse slideway and simultaneously open the longitudinal slideway, and the longitudinal jack 8 is started to continue to longitudinally push in the forward pushing direction.
S2, calculating a shot image of the high-definition camera through an image processing technology to obtain a reverse pushing distance and a correction angle.
In the embodiment of the invention, the variable curvature curve beam cannot be directly pushed to the designated position to drop the beam like a straight beam or a small radius curvature beam, so that the precast beam is pushed to the whole length of the precast beam by a distance of 1/10 according to a pushing plan, then the included angle and the distance between the precast beam and the pushing device are measured and analyzed through a high-definition camera, and the precast beam is reversely pushed by the pushing device according to the analysis result until the designated position is reached. In the reverse pushing process, the elevation influence is not needed to be considered, so that the precast beam and the pushing device are assumed to be in the same plane, and measurement and analysis are performed in the plane.
In the step S2 of the invention, the principle of the image processing technology is that a high-definition camera is used for measuring a distance measurement mark arranged on the section of the rear section of the precast beam, and a computer vision distance measurement program is used for calculating the distance required to be reversely pushed and the angle required to transversely correct the deviation.
Specifically, a ranging marker is placed at the butt end of the precast beam, and the ranging marker is used for capturing the ROI (region of interest (region of interest) by computer vision technology, so as to prepare for ranging work. As shown in FIG. 3, is knownFor the imaging plane, the width of the ranging mark isWThe pixel width of the ranging mark in the image isPAssume that the distance between the ranging mark and the high-definition camera isdThe focal length is:
（1）
as shown in fig. 4, the distance between the high-definition camera and the ranging mark is determined using the principle of similar triangle by moving the high-definition camera position without changing the focal length：
（2）
And calculating the horizontal distance from the ranging mark to the high-definition camera according to the Pythagorean theorem. At this time, the liquid crystal display device,is a bevel edge and a beam body heighthAnd push height->Form a right angle side->Horizontal distance from ranging mark to high-definition cameral：
（3）
Meanwhile, as shown in FIG. 5, a high-definition camera is usedONormal connecting line of pushing platform sectionmThe connecting line of the high-definition camera and the ranging mark is 0 DEG anglenThenNamely, the transverse deviation correcting angle +>。
S3, according to the measurement result, carrying out longitudinal pushing and transverse deviation correction on the precast beam in the reverse pushing direction until the precast Liang Fanxiang is pushed to the designated position and completing beam falling operation.
In step S3, the control source controls the pushing device to perform reverse pushing and transverse deviation correction on the precast beam according to the reverse pushing distance and the transverse deviation correction angle measured in the previous step, and the specific operation steps are as follows:
s31: according to the reverse pushing distance and the transverse deviation correcting angle, transversely pushing the precast beam and transversely correcting the deviation;
s32: after the transverse deviation correction is completed according to the preset angle, verifying the deviation correction result by a high-definition camera, and storing the verification result and error;
s33: longitudinally pushing the precast beam, after pushing according to a preset distance, verifying a longitudinal pushing result by a high-definition camera, and storing a verification result and an error;
s34: and repeating the steps S31-S33 until the precast beam reaches the designated position and the beam falling operation is completed.
In the invention, the longitudinal pushing and the transverse pushing movement operation processes of the pushing device are mutually independent and do not interfere with each other, and the transverse deviation correcting component can be matched with the transverse pushing movement operation to perform angle rotation or adjustment of the precast beam so as to realize the transverse deviation correcting operation of the precast beam in the pushing process, thereby being suitable for pushing construction of the bridge with a variable curvature curve; in addition, the method of combining forward pushing construction with reverse pushing construction effectively ensures that the safety distance between the variable curvature curve prefabricated beam and the built beam is kept in the pushing process, and effectively ensures accurate pushing construction of the variable curvature curve bridge; finally, the invention acquires the image through the high-definition camera and processes the image based on the image processing technology, wherein the processing obtains the contact area of the slideway and the precast beam, can carry out safety monitoring and safety control on the longitudinal pushing construction process, obtains the reverse pushing distance and the deviation correcting angle through processing, and can provide accurate construction data for the reverse pushing construction step.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The pushing method of the variable curvature curve bridge is characterized in that a high-definition camera is arranged at the butt end of the built beam, the prefabricated beam is a variable curvature curve prefabricated beam, a ranging mark serving as a shooting datum point of the high-definition camera is arranged at the butt end of the prefabricated beam, the pushing device further comprises a transverse deviation rectifying component used for conducting transverse deviation rectifying operation, and the transverse deviation rectifying component comprises a rotary support and a cushion block fixed on the rotary support and serving as a contact surface of the bottom of the prefabricated beam;
the method is a method for processing and analyzing a photographed image of a high-definition camera through a control source and controlling pushing movement operation and transverse deviation correction operation of a pushing device according to a processing and analyzing result, and specifically comprises the following steps:
s1, in the forward pushing direction, longitudinally pushing the precast beam and transversely rectifying deviation of the precast beam in real time until the estimated distance of the butt joint end between the precast beam and the built beam is pushed out, and taking the estimated distance as the reverse pushing distance;
s2, calculating a shot image of the high-definition camera through an image processing technology to obtain a reverse pushing distance and a deviation correcting angle;
s3, according to the measurement result, carrying out longitudinal pushing and transverse deviation correction on the precast beam in the reverse pushing direction until the precast Liang Fanxiang is pushed to the designated position and completing beam falling operation.
2. The method of pushing a variable curvature curve bridge according to claim 1, wherein in step S1, the step of correcting the deviation in the transverse direction of the real-time precast beam comprises the steps of: and shooting pushing videos by the high-definition camera and transmitting the pushing videos to a control source in real time, monitoring the contact area between the precast beam and the cushion block by the control source in real time based on a YOLOv7 algorithm, and restraining the longitudinal slide way to open the transverse slide way simultaneously when the contact area between the precast beam and the cushion block is about to be reduced, and performing transverse deviation correcting operation on the precast beam by transverse pushing.
3. The method for pushing a variable curvature curve bridge according to claim 1, wherein in step S1, the step of correcting the transverse direction of the real-time precast beam further comprises the steps of: when the contact surface is detected to be positioned at the central axis position of the precast beam based on the YOLOv7 algorithm, the transverse slideway is restrained, the longitudinal slideway is opened at the same time, and the longitudinal pushing is continuously carried out in the forward pushing direction.
4. The method according to claim 1, wherein in step S1, the distance is a distance between the high-definition camera and a distance measurement mark on the butt end of the precast beam; wherein the estimated distance is 1/10 of the total length of the precast beam.
5. The method according to claim 1, wherein in step S2, the reverse pushing distance is a horizontal distance between the high-definition camera and the distance measuring mark.
6. The method of pushing a bridge with a variable curvature curve as claimed in claim 1, wherein the step S3 comprises the following specific steps:
s31: according to the reverse pushing distance and the transverse deviation correcting angle, transversely pushing the precast beam and transversely correcting the deviation;
s32: after the transverse deviation correction is completed according to a preset angle, verifying a deviation correction result through a high-definition camera;
s33: longitudinally pushing the precast beam, and verifying a longitudinal pushing result through a high-definition camera after pushing according to a preset distance;
s34: and repeating the steps S31-S33 until the precast beam reaches the designated position and the beam falling operation is completed.
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