A prefabricated box girder prestressed linear control tool and overall clustering method

Abstract

The present invention relates to the technical field of cast-in-situ box girder construction, and in particular to a prefabricated box girder prestressed linear control tooling and an overall clustering method. The present invention performs a vibration treatment when the concrete pouring reaches a preset thickness, divides the area to be vibrated into a plurality of vibration sub-areas, screens the vibration risk sub-areas based on the comparison of surface feature parameters of the plurality of vibration sub-areas, determines a plurality of crack vectors based on the crack profiles of the vibration risk sub-areas, determines the linear characterization parameters of the vibration risk sub-areas based on the similarity of the crack vectors, so as to determine the clustering trajectory state of the steel strand clustering, selects an adjustment method for the overall clustering of the steel strands in the prefabricated box girder based on the clustering trajectory state, and further, realizes the real-time acquisition of the distribution state of the corrugated pipe in the construction of the prefabricated box girder, adaptively adjusts the overall clustering method of the prestressed steel strands, and improves the overall clustering quality and efficiency of the prestressed steel strands.

Description

Technical Field

[0001] The invention relates to the technical field of cast-in-situ box girder construction, in particular to a prefabricated box girder prestressed linear shape control tool and an overall clustering method. Background Art

[0002] With the rapid development of modern transportation, the scale and number of bridge construction are increasing, which puts higher requirements on the quality and construction efficiency of bridges. Prefabricated box girders have been widely used in bridge construction due to their advantages of factory production, easy quality control and fast construction speed. The clustering of prestressed steel strands is a key link in the construction of prefabricated box girders, which is directly related to the structural safety and performance of the bridge. In the construction of prefabricated box girders, concrete pouring and vibration are indispensable and important steps. In the process of vibrating concrete, strong high-frequency vibrations will be generated. This vibration will be quickly transmitted to the corrugated pipe embedded in it through concrete as a medium, which can easily cause it to shift in position. The traditional clustering method is difficult to obtain the distribution status of the corrugated pipe in real time during the vibration construction process, and the clustering method cannot be adjusted in time, which affects the clustering quality and efficiency. Therefore, improving the overall clustering quality and efficiency of prestressed steel strands is a technical problem that needs to be solved urgently.

[0003] For example, China's patent application publication number: CN111155443A, the invention discloses a corrugated pipe bundle positioning device and positioning method, the positioning device includes cast-in-place box girder rib stirrups and cast-in-place box girder rib upper steel bars and cast-in-place box girder rib lower steel bars respectively tied to the top and bottom of the cast-in-place box girder rib stirrups, a horizontal ruler perpendicular to the cast-in-place box girder rib upper steel bars or the cast-in-place box girder rib lower steel bars and corrugated pipe positioning steel bars are fixedly installed on the cast-in-place box girder rib stirrups, two or more corrugated pipe positioners are fixedly installed between the horizontal ruler and the corrugated pipe positioning steel bars, and the corrugated pipe passes through the corrugated pipe positioner. During the box girder rib steel bar binding construction, the invention uses the corrugated pipe positioner to position the corrugated pipe, which simplifies the work of bundled corrugated pipe. The corrugated pipe only needs to pass through the positioning door frame of the corrugated pipe positioner, which greatly reduces the construction difficulty, saves construction period and improves construction efficiency.

[0004] The following problems also exist in the prior art:

[0005] The existing technology does not take into account that during the construction of prefabricated box girders, the vibrating rod will generate high-frequency vibrations when vibrating concrete, causing the linear shape of the corrugated pipe to change. During the construction of prefabricated box girders, the existing technology cannot obtain the distribution status of the corrugated pipe in real time, and cannot adaptably adjust the overall clustering method of the prestressed steel strands according to the different distribution states, affecting the overall clustering quality and efficiency of the prestressed steel strands. Summary of the Invention

[0006] To this end, the present invention provides a prefabricated box girder prestressed linear control tooling and an overall clustering method to overcome the problems in the prior art during prefabricated box girder construction, such as the inability to obtain the distribution status of the corrugated pipe in real time and the inability to adaptably adjust the overall clustering method of the prestressed steel strands according to the different distribution states, which affects the overall clustering quality and efficiency of the prestressed steel strands.

[0007] To achieve the above-mentioned object, the present invention provides a method for controlling the overall clustering of prestressed box girders by linear control, comprising:

[0008] Pour concrete into the prefabricated box beam with the reinforcement cage and corrugated pipe embedded in it, and vibrate the concrete when it reaches the preset thickness;

[0009] Divide the area to be vibrated into several vibration sub-areas, determine the surface characteristic parameters of each vibration sub-area, and screen the vibration risk sub-areas based on the comparison of the surface characteristic parameters of the several vibration sub-areas;

[0010] Determining a plurality of crack vectors based on the crack profile of the vibration risk sub-region, and determining linear characterization parameters of the vibration risk sub-region according to the similarity of the crack vectors to determine the cluster penetration trajectory state of the steel strand;

[0011] The adjustment method for overall strand threading of the prefabricated box girder is selected based on the threading trajectory state, including:

[0012] Determining the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determining the traction direction of the reciprocating motion of the traction steel strand according to the determination result of the deflection inclination direction;

[0013] Alternatively, a trace characterization value of each crack profile in the vibration risk sub-region is obtained, and a rotation speed of the traction steel strand rotating through the cluster in the vibration risk sub-region is determined according to the trace characterization value;

[0014] The trace characterization value is determined according to the crack width of each crack.

[0015] Furthermore, determining the surface characteristic parameters includes,

[0016] The height values ​​of several points in the vibrating sub-area are obtained, the difference between the maximum value and the minimum value of the height values ​​is calculated, and the difference is determined as the surface characteristic parameter.

[0017] Furthermore, the vibration risk sub-region is screened as the vibration risk sub-region according to a determination result that the surface characteristic parameters of the vibration sub-region meet the vibration abnormality characterization condition;

[0018] The vibration abnormality characterization condition is that the surface characteristic parameter of the vibration sub-area exceeds the average value of the surface characteristic parameters of several vibration sub-areas.

[0019] Furthermore, determining the linear characterization parameters of the vibration risk sub-area includes:

[0020] acquiring a surface image of the vibration risk sub-area to identify a plurality of crack contours in the surface image;

[0021] Constructing the crack vector with one end of the crack outline as a vector starting point and the other end of the crack outline as a vector ending point;

[0022] Calculating the vector angle between any crack vector and the remaining crack vectors in the vibration risk sub-area;

[0023] The variance of the angles between the plurality of vectors is determined as the linear characterization parameter.

[0024] Furthermore, the process of determining the strand threading trajectory state includes:

[0025] In response to the linear characterization parameters of the plurality of vibration risk sub-areas meeting the first state determination condition, determining that the strand threading trajectory state is the first strand threading trajectory state;

[0026] In response to the plurality of linear characterization parameters not meeting the first state determination condition, determining that the strand threading trajectory state is a second strand threading trajectory state;

[0027] The first state determination condition is that a plurality of linear characterization parameters do not exceed a preset linear characterization parameter threshold.

[0028] Furthermore, the process of selecting the adjustment method for the overall strand threading of the prefabricated box girder includes:

[0029] If the clustering trajectory state is the first clustering trajectory state, the adjustment method for the overall clustering of the steel strands of the prefabricated box girder is selected to determine the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determine the traction direction of the reciprocating motion of the pulling steel strands according to the determination result of the deflection inclination direction;

[0030] If the clustering trajectory state is the second clustering trajectory state, the adjustment method for the overall clustering of the steel strands in the prefabricated box girder is selected to obtain the trace characterization value of each crack contour in the vibration risk sub-area, and determine the rotation speed of the traction steel strands for rotating clustering in the vibration risk sub-area based on the trace characterization value.

[0031] Furthermore, the process of determining the deflection tendency direction of the corrugated tube in the prefabricated box beam includes:

[0032] In response to vector parameters of crack vectors in a number of vibration risk sub-areas meeting a lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the prefabricated box girder is parallel to the horizontal plane;

[0033] In response to vector parameters of crack vectors in a number of vibration risk sub-areas not meeting a lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the precast box girder is a direction perpendicular to the horizontal plane;

[0034] The lateral offset determination condition is that the average value of vector parameters of a plurality of crack vectors does not exceed a preset length reference value, and the vector parameter is the vector length value of the crack vector.

[0035] Furthermore, the direction of the traction force of the reciprocating motion of the traction steel strand is the same as the direction of the deviation tendency of the corrugated tube in the prefabricated box beam.

[0036] Furthermore, the process of determining the trace characterization value and the rotation speed includes:

[0037] Obtaining the crack widths of several points on each crack in the vibration risk sub-region, determining the difference between the maximum crack width and the minimum crack width as the trace coefficient of the crack, and determining the maximum trace coefficient as the trace characterization value of the vibration risk sub-region;

[0038] The rotation speed of the steel strand as a whole passing through the cluster to the vibration risk sub-area is positively correlated with the trace characterization value.

[0039] Furthermore, the present invention also provides a prefabricated box girder prestressed linear control tool, comprising:

[0040] a vibration feature acquisition module for dividing the vibration sub-regions, determining surface feature parameters of the vibration sub-regions to screen vibration risk sub-regions, determining a number of crack vectors in the vibration risk sub-regions, and determining a trace characterization value of each crack;

[0041] a linear recognition module connected to the vibration feature acquisition module, for determining linear characterization parameters of the vibration risk sub-area to determine the cluster penetration trajectory state of the steel strand;

[0042] a cluster penetration control module, which is connected to the vibration feature acquisition module and the linear recognition module respectively, and includes a traction component and a determination unit;

[0043] The traction assembly is used to provide traction for the entire steel strand to be threaded through the cluster;

[0044] The judgment unit is used to select an adjustment method for the overall threading of the steel strands in the prefabricated box girder, determine the offset tendency direction of the corrugated tube in the prefabricated box girder, determine the traction direction of the reciprocating motion of the traction steel strands, and determine the rotation speed of the traction steel strands in the vibration risk sub-area.

[0045] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention pours concrete on the prefabricated box girder with the completed steel cage construction and pre-embedded corrugated pipe, and performs vibration treatment when the concrete pouring reaches a preset thickness, and divides the vibrated area into several vibration sub-areas, and screens the vibration risk sub-areas based on the comparison of surface feature parameters of the several vibration sub-areas, and determines several crack vectors based on the crack contours of the vibration risk sub-areas, and determines the linear characterization parameters of the vibration risk sub-areas based on the similarity of the crack vectors to determine the clustering trajectory state of the steel strands, and selects the adjustment method for the overall clustering of the steel strands in the prefabricated box girder based on the clustering trajectory state. Furthermore, in the construction of the prefabricated box girder, it is achieved that the distribution state of the corrugated pipe is obtained in real time, the overall clustering method of the prestressed steel strands is adaptively adjusted, and the overall clustering quality and efficiency of the prestressed steel strands are improved.

[0046] In particular, the present invention selects vibration risk sub-areas by obtaining surface characteristic parameters of the vibration sub-area. It can be understood that the surface characteristic parameter is the difference between the maximum and minimum surface heights in the vibration sub-area. The larger the surface characteristic parameter, the higher the surface unevenness of the vibration sub-area, and the concrete surface is accumulated. During the vibration process, the accumulated concrete will flow and flatten to the low-lying areas under the action of gravity, exerting a certain impact and extrusion force on the corrugated pipe, making it easier for the corrugated pipe to move. At the same time, in actual construction, there may be multiple factors affecting the height difference. For example, different steel bar densities will lead to different concrete flow and accumulation conditions. The average value can comprehensively consider these factors and provide a relatively comprehensive and balanced benchmark for judging whether the height difference of the vibration sub-area is abnormal. The present invention determines the surface characteristic parameter by the height values ​​of several points in the vibration sub-area, and selects the vibration risk sub-area based on the comparison of several surface characteristic parameters. Furthermore, it is realized that in the construction of prefabricated box girders, areas with risky corrugated pipe distribution are screened, thereby improving the overall threading quality and efficiency of prestressed steel strands.

[0047] In particular, the present invention determines the trajectory state of the steel strand through the cluster by the linear characterization parameter of the vibration risk sub-area. It can be understood that the deviation of the corrugated pipe caused by vibration will generate stress on the surrounding concrete, and the direction of the cracks on the concrete surface represents the direction of the stress on the concrete. The linear characterization parameter represents the variance of the vector angles of several crack vectors in the vibration risk sub-area. The smaller the linear characterization parameter, the higher the similarity of the angles between the crack vectors in the vibration risk sub-area, and the higher the parallelism of the crack directions in the vibration risk sub-area, which represents that the stress direction generated by the deviation of the corrugated pipe caused by vibration on the surrounding concrete is relatively uniform. As a result, the offset direction of the corrugated pipe is the overall lateral or longitudinal offset of the corrugated pipe. The larger the linear characterization parameter, the lower the similarity of the angles between the crack vectors in the vibration risk sub-area, and the more non-parallel the directions of the cracks in the vibration risk sub-area. The stress direction of the surrounding concrete generated by the offset of the corrugated pipe caused by vibration is inconsistent. The offset of the corrugated pipe is the local angular torsion of the corrugated pipe. The present invention determines the clustering trajectory state of the steel strand through the linear characterization parameter of the vibration risk sub-area, and further, realizes the real-time acquisition of the distribution state of the corrugated pipe in the construction of the prefabricated box girder, thereby improving the overall clustering quality and efficiency of the prestressed steel strand.

[0048] In particular, under the first threading trajectory state condition, the present invention selects an adjustment method for the overall threading of the steel strands in the prefabricated box girder to determine the direction of the traction force applied to the steel strands for reciprocating motion according to the offset tendency direction of the corrugated tube in the prefabricated box girder. It can be understood that the first threading trajectory state is that the corrugated tube has undergone an overall lateral or longitudinal displacement. When the corrugated tube is laterally offset, the tensile stress generated by the lateral movement of the corrugated tube on the concrete perpendicular to its moving direction is the largest. Therefore, the direction of the crack is perpendicular to the offset direction and the crack perpendicular to the horizontal plane. The crack length value reflected on the concrete surface is smaller, so the vector length of the crack vector is smaller. When the corrugated tube is longitudinally offset, The direction of the crack is parallel to the horizontal plane, which is reflected in the fact that the crack length value on the concrete surface is large. Therefore, the vector length of the crack vector is large. Applying a reciprocating traction force to the steel strand in the same direction as the offset inclination direction of the corrugated tube in the prefabricated box girder can reduce the channel friction caused by the offset of the corrugated tube. The present invention determines the offset inclination direction of the corrugated tube in the prefabricated box girder through several vector length parameters to determine the direction of the traction force applied to the steel strand for reciprocating motion. Furthermore, it realizes the real-time acquisition of the distribution status of the corrugated tube in the construction of the prefabricated box girder, adaptively adjusts the overall clustering method of the prestressed steel strand, and improves the overall clustering quality and efficiency of the prestressed steel strand.

[0049] In particular, under the condition of the second threading trajectory state, the present invention selects an adjustment method for the overall threading of the steel strands of the prefabricated box girder as follows: determining the rotation speed of the traction force applied to the steel strands in the rotation direction in the vibration risk sub-area according to the trace characterization value. It can be understood that the second threading trajectory state is that the corrugated pipe has a local angle twist. The local angle twist of the corrugated pipe will cause the surrounding concrete to be subjected to uneven extrusion pressure and tensile stress. The difference in stress distribution will cause the concrete to deform to different degrees at different positions, resulting in inconsistent crack widths. The trace characterization value is the crack width. The fluctuation value of the crack width, the larger the trace characterization value, the more obvious the inconsistency of the crack width, the larger the local torsion angle of the bellows, the greater the required rotation speed, in order to reduce the channel friction resistance caused by the torsion of the bellows angle. The present invention determines the rotation speed of the traction force applied to the steel strand in the rotation direction in the vibration risk sub-area through the trace characterization value of the vibration risk sub-area, thereby realizing the real-time acquisition of the distribution state of the corrugated pipe in the construction of prefabricated box girders, adaptively adjusting the overall clustering method of the prestressed steel strands, and improving the overall clustering quality and efficiency of the prestressed steel strands. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a step diagram of a method for controlling the overall clustering of prestressed box girders according to an embodiment of the present invention;

[0051] Figure 2 A logic flow chart for screening vibration risk sub-areas according to an embodiment of the present invention;

[0052] Figure 3 A logic flow chart for determining the deflection tendency direction of the corrugated tube in the prefabricated box beam according to an embodiment of the present invention;

[0053] Figure 4 This is a functional block diagram of the prestressed linear control tooling for prefabricated box girders according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0055] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0056] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0057] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] See also Figure 1 As shown, it is a step diagram of a method for controlling the linear shape of prestressed precast box girders to penetrate the cluster as a whole according to an embodiment of the present invention. A method for controlling the linear shape of prestressed precast box girders to penetrate the cluster as a whole according to the present invention comprises:

[0059] Step S100, pouring concrete on the prefabricated box girder with the reinforcement cage and corrugated pipe embedded, and vibrating the concrete when it reaches a preset thickness;

[0060] Specifically, the preset thickness of the concrete pouring for vibration treatment can be set by those skilled in the art according to the actual size of the prefabricated box girder. Preferably, when the actual size of the prefabricated box girder is 30m, the preset thickness can be 30cm.

[0061] Specifically, vibrating during concrete pouring is a common construction process for precast box girder construction, which is used to improve the density of concrete, ensure structural strength and durability, improve the surface quality of concrete, and ensure the effect of prestressing. It will not be elaborated here.

[0062] Step S200: Divide the area to be vibrated into a plurality of vibrating sub-areas, determine the surface characteristic parameters of each vibrating sub-area, and select the vibration risk sub-area based on the comparison of the surface characteristic parameters of the plurality of vibrating sub-areas;

[0063] Specifically, the division of the vibration sub-area can be set by technical personnel in this field according to the accuracy requirements of prefabricated box girder construction. The higher the accuracy requirement, the smaller the vibration sub-area. Preferably, the vibration sub-area can be divided into a 40cm×40cm rectangular area with the position of the vibrating rod as the center point of the area.

[0064] Step S300: determining a plurality of crack vectors based on the crack profile of the vibration risk sub-region, and determining linear characterization parameters of the vibration risk sub-region according to the similarity of the crack vectors to determine the cluster penetration trajectory state of the steel strand;

[0065] Step S400, based on the strand threading trajectory state, selects an adjustment method for strand threading the prefabricated box girder, including:

[0066] Determining the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determining the traction direction of the reciprocating motion of the traction steel strand according to the determination result of the deflection inclination direction;

[0067] Alternatively, a trace characterization value of each crack profile in the vibration risk sub-region is obtained, and a rotation speed of the traction steel strand rotating through the cluster in the vibration risk sub-region is determined according to the trace characterization value;

[0068] Wherein, the trace characterization value is determined according to the crack width of each crack.

[0069] Specifically, determining the surface characteristic parameters includes,

[0070] The height values ​​of several points in the vibrating sub-area are obtained, the difference between the maximum value and the minimum value of the height values ​​is calculated, and the difference is determined as the surface characteristic parameter.

[0071] Specifically, the number of selected points in the vibrating sub-area can be set by technical personnel in this field according to the accuracy requirements of prefabricated box girder construction. The higher the accuracy requirements, the more points are selected. The value range of the number of selected points can be [5, 15]. Preferably, 10 points can be selected.

[0072] Specifically, a specific embodiment for determining the surface characteristic parameters is given here, and the height values ​​of 5 points in the vibrating area are obtained, which are 30 cm, 27.1 cm, 33.8 cm, 37 cm, and 35.1 cm respectively. The difference between the maximum and minimum height values ​​is 9.9 cm, so the surface characteristic parameter is 9.9 cm.

[0073] Specifically, the present invention does not impose any specific limitation on the method for obtaining the height values ​​of several points in the vibrating area. Preferably, it can be achieved by using an industrial camera in conjunction with image processing software to obtain the concrete surface image at a preset monitoring time, and establish a three-dimensional model to output the height values. This will not be repeated here.

[0074] Specifically, the preset monitoring time for acquiring the concrete surface image may be 15 seconds after the start of vibration.

[0075] Specifically, see Figure 2As shown, it is a logic flow chart for screening vibration risk sub-regions according to an embodiment of the present invention. The method for screening vibration risk sub-regions is to screen the vibration sub-regions as vibration risk sub-regions based on the result of determining whether the surface characteristic parameters of the vibration sub-regions meet the vibration abnormality characterization conditions;

[0076] If the surface characteristic parameters of the vibrating sub-region do not meet the determination result of the vibration abnormality characterization condition, the vibrating sub-region is not screened;

[0077] The vibration abnormality characterization condition is that the surface characteristic parameter of the vibration sub-area exceeds the average value of the surface characteristic parameters of several vibration sub-areas.

[0078] Specifically, the present invention selects vibration risk sub-areas by obtaining surface characteristic parameters of the vibration sub-area. It can be understood that the surface characteristic parameter is the difference between the maximum and minimum surface heights in the vibration sub-area. The larger the surface characteristic parameter, the higher the surface unevenness of the vibration sub-area, and the concrete surface is accumulated. During the vibration process, the accumulated concrete will flow and flatten to the low-lying areas under the action of gravity, exerting a certain impact and extrusion force on the corrugated pipe, making it easier for the corrugated pipe to move. At the same time, in actual construction, there may be multiple factors affecting the height difference. For example, different steel bar densities will lead to different concrete flow and accumulation conditions. The average value can comprehensively consider these factors and provide a relatively comprehensive and balanced benchmark for judging whether the height difference of the vibration sub-area is abnormal. The present invention determines the surface characteristic parameter by the height values ​​of several points in the vibration sub-area, and selects the vibration risk sub-area based on the comparison of several surface characteristic parameters. Furthermore, it is realized that the areas with risk of corrugated pipe distribution are screened in the construction of prefabricated box girders, thereby improving the overall threading quality and efficiency of prestressed steel strands.

[0079] Specifically, the linear characterization parameters of the vibration risk sub-area are determined to include:

[0080] acquiring a surface image of the vibration risk sub-area to identify a plurality of crack contours in the surface image;

[0081] Constructing the crack vector with one end of the crack outline as a vector starting point and the other end of the crack outline as a vector ending point;

[0082] Calculating the vector angle between any crack vector and the remaining crack vectors in the vibration risk sub-area;

[0083] The variance of the angles between the plurality of vectors is determined as the linear characterization parameter.

[0084] Specifically, a specific embodiment of determining the linear characterization parameters of the vibration risk sub-area is given here. The five crack vectors in the vibration risk sub-area are (10, 1), (11, 1.2), (9, 0.8), (10.5, 2), and (10.2, 0.9). The vector angles between any crack vector and the remaining crack vectors are 1.3°, 1.6°, 6.2°, 1.2°, 2.4°, 5.1°, 1.5°, 7.1°, 2°, and 3°, respectively. The variance of the vector angles is 4.29. Therefore, the linear characterization parameter is 4.29.

[0085] Specifically, the process of determining the strand threading trajectory state includes:

[0086] In response to the linear characterization parameters of the plurality of vibration risk sub-areas meeting the first state determination condition, determining the strand threading trajectory state as the first strand threading trajectory state;

[0087] In response to the plurality of linear characterization parameters not meeting the first state determination condition, determining that the strand threading trajectory state is a second strand threading trajectory state;

[0088] The first state determination condition is that a plurality of linear characterization parameters do not exceed a preset linear characterization parameter threshold.

[0089] Specifically, the preset linear characterization parameter threshold can be set by technical personnel in this field according to the accuracy requirements of prefabricated box girder construction. The higher the accuracy requirement, the smaller the preset linear characterization parameter threshold. The value range of the linear characterization parameter threshold can be [3, 10]. Preferably, the linear characterization parameter threshold can be 5.

[0090] Specifically, the present invention determines the trajectory state of the steel strand through the cluster by the linear characterization parameter of the vibration risk sub-area. It can be understood that the deviation of the corrugated pipe caused by vibration will generate stress on the surrounding concrete. The direction of the cracks on the concrete surface represents the direction of the stress on the concrete. The linear characterization parameter represents the variance of the vector angles of several crack vectors in the vibration risk sub-area. The smaller the linear characterization parameter, the higher the similarity of the angles between the crack vectors in the vibration risk sub-area, and the higher the parallelism of the crack directions in the vibration risk sub-area, which represents the relative stress direction of the surrounding concrete generated by the deviation of the corrugated pipe caused by vibration. The deviation direction of the corrugated pipe is the overall lateral or longitudinal deviation of the corrugated pipe. The larger the linear characterization parameter, the lower the similarity of the angles between the crack vectors in the vibration risk sub-area, and the more non-parallel the directions of the cracks in the vibration risk sub-area. The stress direction of the surrounding concrete generated by the deviation of the corrugated pipe caused by vibration is inconsistent. The deviation of the corrugated pipe is the local angular torsion of the corrugated pipe. The present invention determines the clustering trajectory state of the steel strand through the linear characterization parameter of the vibration risk sub-area, and further realizes the real-time acquisition of the distribution state of the corrugated pipe in the construction of the prefabricated box girder, thereby improving the overall clustering quality and efficiency of the prestressed steel strand.

[0091] Specifically, the process of selecting the adjustment method for the overall strand threading of prefabricated box girders includes:

[0092] If the clustering trajectory state is the first clustering trajectory state, the adjustment method for the overall clustering of the steel strands of the prefabricated box girder is selected to determine the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determine the traction direction of the reciprocating motion of the pulling steel strands according to the determination result of the deflection inclination direction;

[0093] If the clustering trajectory state is the second clustering trajectory state, the adjustment method for the overall clustering of the steel strands in the prefabricated box girder is selected to obtain the trace characterization value of each crack contour in the vibration risk sub-area, and determine the rotation speed of the traction steel strands for rotating clustering in the vibration risk sub-area based on the trace characterization value.

[0094] Specifically, see Figure 3 As shown, it is a logic flow chart for determining the deviation inclination direction of the corrugated tube in the prefabricated box beam according to an embodiment of the present invention. The process of determining the deviation inclination direction of the corrugated tube in the prefabricated box beam includes:

[0095] In response to vector parameters of crack vectors in a number of vibration risk sub-areas meeting a lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the prefabricated box girder is parallel to the horizontal plane;

[0096] In response to the fact that vector parameters of crack vectors in a number of vibration risk sub-areas do not meet the lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the precast box girder is a direction perpendicular to the horizontal plane;

[0097] The lateral offset determination condition is that the average value of vector parameters of a plurality of crack vectors does not exceed a preset length reference value, and the vector parameter is the vector length value of the crack vector.

[0098] Specifically, the preset length reference value can be set by those skilled in the art based on historical experimental data of several identical prefabricated box girder construction parameters. Preferably, the length reference value can be 2 cm.

[0099] Specifically, a specific embodiment of determining the offset inclination direction of the corrugated pipe in the prefabricated box girder is given here. A total of 10 crack vectors are obtained in the three vibration risk sub-areas. The vector length values ​​of the crack vectors are 3.4cm, 3.8cm, 2.9cm, 3.2cm, 3.9cm, 2.8cm, 3.4cm, 3cm, 4cm, and 3.1cm, respectively. The vector parameters of the crack vectors are 3.4cm, 3.8cm, 2.9cm, 3.2cm, 3.9cm, 2.8cm, 3.4cm, 3cm, 4cm, and 3.1cm, respectively. The average value of the vector parameters is 3.35cm. The average value of the vector parameters of 3.35cm is greater than the length reference value of 2cm. Therefore, it is determined that the offset inclination direction of the corrugated pipe in the prefabricated box girder is perpendicular to the horizontal plane.

[0100] Specifically, the direction of the traction force of the reciprocating motion of the traction steel strand is the same as the direction of the deviation tendency of the corrugated tube in the prefabricated box beam.

[0101] Specifically, a specific embodiment of the reciprocating motion of the pulling steel strand is given here. When it is determined that the offset tendency direction of the corrugated tube in the prefabricated box beam is perpendicular to the horizontal plane, the winch pulls the steel strand to thread the cluster, and the winch drives the steel strand to swing up and down in a direction perpendicular to the horizontal plane.

[0102] Specifically, under the first threading trajectory state condition, the present invention selects an adjustment method for the overall threading of the steel strands in the prefabricated box girder to determine the direction of the traction force applied to the steel strands for reciprocating motion according to the offset tendency direction of the corrugated tube in the prefabricated box girder. It can be understood that the first threading trajectory state is that the corrugated tube undergoes an overall lateral or longitudinal displacement. When the corrugated tube deviates laterally, the tensile stress generated by the lateral movement of the corrugated tube on the concrete perpendicular to its moving direction is the largest. Therefore, the direction of the crack is perpendicular to the offset direction and the crack perpendicular to the horizontal plane. The crack length value reflected on the concrete surface is smaller, so the vector length of the crack vector is smaller. When the corrugated tube deviates longitudinally, the tensile stress generated by the lateral movement of the corrugated tube on the concrete perpendicular to its moving direction is the largest. Therefore, the crack length value is smaller when the corrugated tube deviates longitudinally. When the crack is in the direction parallel to the horizontal plane, the crack length value on the concrete surface is large, so the vector length of the crack vector is large. Applying a reciprocating traction force to the steel strand in the same direction as the offset inclination direction of the corrugated tube in the precast box girder can reduce the channel friction caused by the offset of the corrugated tube. The present invention determines the offset inclination direction of the corrugated tube in the precast box girder through several vector length parameters to determine the direction of the traction force applied to the steel strand for reciprocating motion. Furthermore, it is realized that the distribution state of the corrugated tube is obtained in real time during the construction of the precast box girder, the overall clustering method of the prestressed steel strand is adaptively adjusted, and the overall clustering quality and efficiency of the prestressed steel strand are improved.

[0103] Specifically, the process of determining the trace characterization value and the rotation speed includes:

[0104] Obtaining the crack widths of several points on each crack in the vibration risk sub-region, determining the difference between the maximum crack width and the minimum crack width as the trace coefficient of the crack, and determining the maximum trace coefficient as the trace characterization value of the vibration risk sub-region;

[0105] The rotation speed of the steel strand as a whole passing through the cluster to the vibration risk sub-area is positively correlated with the trace characterization value.

[0106] Specifically, a specific embodiment of determining the trace characterization value is given here, and the crack widths of 5 points on 3 cracks in the vibration risk sub-area are obtained. The crack widths of each point on crack 1 are 0.2mm, 0.3mm, 0.25mm, 0.35mm, and 0.22mm respectively. The crack widths of each point on crack 2 are 0.4mm, 0.38mm, 0.42mm, 0.35mm, and 0.39mm respectively. The crack widths of each point on crack 3 are 0.18mm, 0.2mm, 0.15mm, and 0.22mm respectively. 0.16mm, the difference between the maximum crack width and the minimum crack width of crack 1 is 0.15mm, the difference between the maximum crack width and the minimum crack width of crack 2 is 0.07mm, the difference between the maximum crack width and the minimum crack width of crack 3 is 0.07mm, the trace coefficient of crack 1 is 0.15mm, the trace coefficient of crack 2 is 0.07mm, the trace coefficient of crack 3 is 0.07mm, and the maximum value of the trace coefficient is 0.15mm. Therefore, the trace characterization value of the current vibration risk sub-area is 0.15mm.

[0107] Specifically, the rotation speed may range from [100, 200], with the interval unit being revolutions per minute. When the trace characterization value is 0.15 mm, the rotation speed may be set to 100 revolutions per minute.

[0108] Specifically, the steel strand can be wound around a drum shaft connected to the planetary gear through the planetary gear mechanism in the winch's transmission system. When the motor is driven, the planetary gear will revolve around the center gear, driving the drum shaft to rotate at the same time, causing the steel strand to generate rotational traction. The rotation speed can be adjusted by adjusting the motor drive, and the length of the steel strand penetration is determined by the position of the vibration risk sub-area. When the steel strand penetration length reaches the position of the vibration risk sub-area, the rotation speed is adjusted according to the trace characterization value of the vibration risk sub-area.

[0109] Specifically, under the condition of the second threading trajectory state, the present invention selects an adjustment method for the overall threading of the steel strands of the prefabricated box girder to determine the rotation speed of the traction force applied to the steel strands in the rotation direction in the vibration risk sub-area according to the trace characterization value. It can be understood that the second threading trajectory state is that the corrugated pipe has a local angle twist. The local angle twist of the corrugated pipe will cause the surrounding concrete to be subjected to uneven extrusion pressure and tensile stress. The difference in stress distribution will cause the concrete to deform to different degrees at different positions, resulting in inconsistent crack widths. The trace characterization value is the crack. The fluctuation value of the upper crack width, the larger the trace characterization value, the more obvious the inconsistency of the crack width, the larger the local torsion angle of the bellows, the greater the required rotation speed, in order to reduce the channel friction resistance caused by the torsion of the bellows angle. The present invention determines the rotation speed of the traction force applied to the steel strand in the rotation direction in the vibration risk sub-area through the trace characterization value of the vibration risk sub-area, thereby realizing the real-time acquisition of the distribution state of the corrugated pipe in the construction of prefabricated box girders, adaptively adjusting the overall clustering method of the prestressed steel strands, and improving the overall clustering quality and efficiency of the prestressed steel strands.

[0110] Specifically, see Figure 4 As shown, it is a functional block diagram of a prefabricated box girder prestressed linear control tooling according to an embodiment of the present invention. The present invention also provides a prefabricated box girder prestressed linear control tooling, comprising:

[0111] a vibration feature acquisition module for dividing the vibration sub-regions, determining surface feature parameters of the vibration sub-regions to screen vibration risk sub-regions, determining a number of crack vectors in the vibration risk sub-regions, and determining a trace characterization value of each crack;

[0112] Specifically, the present invention does not limit the specific structure of the vibration feature acquisition module. Preferably, it can be implemented by an industrial camera with a built-in image processor in conjunction with a microprocessor. The concrete surface image is acquired by the industrial camera, and the vibration sub-area is divided by the image processor to determine the surface feature parameters, the crack vector and the trace characterization value. The vibration risk sub-area is screened by the microprocessor, which will not be repeated here.

[0113] a linear recognition module connected to the vibration feature acquisition module, for determining linear characterization parameters of the vibration risk sub-area to determine the cluster penetration trajectory state of the steel strand;

[0114] Specifically, the present invention does not limit the specific structure of the linear identification module. Preferably, the linear identification module can be a field programmable logic component to determine the linear characterization parameters of the vibration risk sub-area and determine the cluster penetration trajectory state of the steel strands, which will not be repeated here.

[0115] a cluster penetration control module, which is connected to the vibration feature acquisition module and the line shape recognition module respectively, and includes a traction component and a determination unit;

[0116] The traction assembly is used to provide traction for the entire steel strand to be threaded through the cluster;

[0117] The judgment unit is used to select an adjustment method for the overall threading of the steel strands in the prefabricated box girder, determine the offset tendency direction of the corrugated tube in the prefabricated box girder, determine the traction direction of the reciprocating motion of the traction steel strands, and determine the rotation speed of the traction steel strands in the vibration risk sub-area.

[0118] Specifically, the present invention does not limit the specific structure of the traction assembly. Preferably, it can be a winch, which is a common equipment in the construction process of prefabricated box girders and will not be described in detail here.

[0119] Specifically, the present invention does not limit the specific structure of the judgment unit. Preferably, it can be a processor used in a computer, which is used to select the adjustment method for the overall threading of the steel strands in the prefabricated box girder, determine the offset tendency direction of the corrugated tube in the prefabricated box girder, determine the direction of the traction force applied to the steel strands for reciprocating motion, and determine the rotation speed of the traction force applied to the steel strands in the rotation direction in the vibration risk sub-area. No further details will be given here.

[0120] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0121] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for controlling the overall clustering of prestressed box girders in linear shape, characterized in that: include: Pour concrete into the prefabricated box beam with the reinforcement cage and corrugated pipe embedded in it, and vibrate the concrete when it reaches the preset thickness; Divide the area to be vibrated into several vibration sub-areas, determine the surface characteristic parameters of each vibration sub-area, and screen the vibration risk sub-areas based on the comparison of the surface characteristic parameters of the several vibration sub-areas; Determining the surface characteristic parameter includes obtaining height values ​​of a plurality of points within the vibrating sub-area, calculating a difference between a maximum value and a minimum value of the height values, and determining the difference as the surface characteristic parameter; The vibration risk sub-region is screened as a vibration risk sub-region according to a determination result that the surface characteristic parameters of the vibration sub-region meet the vibration abnormality characterization condition; The vibration abnormality characterization condition is that the surface characteristic parameter of the vibration sub-region exceeds the average value of the surface characteristic parameters of several vibration sub-regions; Determining a plurality of crack vectors based on the crack profile of the vibration risk sub-region, and determining linear characterization parameters of the vibration risk sub-region according to the similarity of the crack vectors to determine the cluster penetration trajectory state of the steel strand; Determining the linear characterization parameter of the vibration risk sub-region includes obtaining a surface image of the vibration risk sub-region to identify a plurality of crack contours in the surface image, constructing the crack vector with one end of the crack contour as a vector starting point and the other end of the crack contour as a vector end point, calculating a vector angle between any crack vector and the remaining crack vectors in the vibration risk sub-region, and determining the variance of the plurality of vector angles as the linear characterization parameter; In response to the linear characterization parameters of the plurality of vibration risk sub-areas meeting the first state determination condition, determining that the strand threading trajectory state is the first strand threading trajectory state; In response to the plurality of linear characterization parameters not meeting the first state determination condition, determining that the strand threading trajectory state is a second strand threading trajectory state; Wherein, the first state determination condition is that the plurality of linear characterization parameters do not exceed the preset linear characterization parameter threshold; The adjustment method for overall strand threading of the prefabricated box girder is selected based on the threading trajectory state, including: Determining the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determining the traction direction of the reciprocating motion of the traction steel strand according to the determination result of the deflection inclination direction; Alternatively, a trace characterization value of each crack profile in the vibration risk sub-region is obtained, and a rotation speed of the traction steel strand rotating through the cluster in the vibration risk sub-region is determined according to the trace characterization value; The trace characterization value is determined according to the crack width of each crack.

2. The method for controlling the overall clustering of prestressed box girders according to claim 1 is characterized in that: The process of selecting the adjustment method for the overall strand threading of precast box girders includes: If the clustering trajectory state is the first clustering trajectory state, the adjustment method for the overall clustering of the steel strands of the prefabricated box girder is selected to determine the deflection inclination direction of the corrugated tube in the prefabricated box girder according to the vector parameters of each crack vector in the vibration risk sub-area, and determine the traction direction of the reciprocating motion of the pulling steel strands according to the determination result of the deflection inclination direction; If the clustering trajectory state is the second clustering trajectory state, the adjustment method for the overall clustering of the steel strands in the prefabricated box girder is selected to obtain the trace characterization value of each crack contour in the vibration risk sub-area, and determine the rotation speed of the traction steel strands for rotating clustering in the vibration risk sub-area based on the trace characterization value.

3. The method for controlling the overall clustering of prestressed box girders according to claim 2 is characterized in that: The process of determining the deflection tendency direction of the corrugated tube in the precast box beam includes: In response to vector parameters of crack vectors in a number of vibration risk sub-areas meeting a lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the prefabricated box girder is parallel to the horizontal plane; In response to vector parameters of crack vectors in a number of vibration risk sub-areas not meeting a lateral offset determination condition, determining that the offset tendency direction of the corrugated tube in the precast box girder is a direction perpendicular to the horizontal plane; The lateral offset determination condition is that the average value of vector parameters of a plurality of crack vectors does not exceed a preset length reference value, and the vector parameter is the vector length value of the crack vector.

4. The method for controlling the overall clustering of prestressed box girders according to claim 3 is characterized in that: The direction of the traction force of the reciprocating motion of the traction steel strand is the same as the direction of the deviation tendency of the corrugated tube in the prefabricated box beam.

5. The method for controlling the overall clustering of prestressed box girders according to claim 4 is characterized in that: The process of determining the trace characteristic value and the rotation speed includes, Obtaining the crack widths of several points on each crack in the vibration risk sub-region, determining the difference between the maximum crack width and the minimum crack width as the trace coefficient of the crack, and determining the maximum trace coefficient as the trace characterization value of the vibration risk sub-region; The rotation speed of the steel strand as a whole passing through the cluster to the vibration risk sub-area is positively correlated with the trace characterization value.

6. A prefabricated box girder prestressed linear control tool, used to implement the prefabricated box girder prestressed linear control overall clustering method according to any one of claims 1 to 5, characterized in that: include, a vibration feature acquisition module for dividing the vibration sub-regions, determining surface feature parameters of the vibration sub-regions to screen vibration risk sub-regions, determining a number of crack vectors in the vibration risk sub-regions, and determining a trace characterization value of each crack; a linear recognition module connected to the vibration feature acquisition module, for determining linear characterization parameters of the vibration risk sub-area to determine the cluster penetration trajectory state of the steel strand; a cluster penetration control module, which is connected to the vibration feature acquisition module and the linear recognition module respectively, and includes a traction component and a determination unit; The traction assembly is used to provide traction for the entire steel strand to be threaded through the cluster; The judgment unit is used to select an adjustment method for the overall threading of the steel strands in the prefabricated box girder, determine the offset tendency direction of the corrugated tube in the prefabricated box girder, determine the traction direction of the reciprocating motion of the traction steel strands, and determine the rotation speed of the traction steel strands in the vibration risk sub-area.

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