A method for measuring deviation value of prefabricated box girder bridge deck outside
By obtaining the perpendicular bisector from the bottom slab of the precast box girder and measuring the deviation in the width direction of the bridge deck in segments, the problems of low accuracy and large error in the existing technology are solved, and high-precision deviation measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-28
- Publication Date
- 2026-03-20
AI Technical Summary
Existing methods for measuring the width deviation of precast box girder bridge decks have low accuracy and large errors, and cannot scientifically and effectively cover all sections and locations along the length of the bridge deck, resulting in low reliability of the measurement data.
By obtaining the perpendicular bisectors from the two end faces along the length of the bottom slab of the precast box girder, the centerline of the bridge deck is obtained. Using this as a reference, the deviation value in the width direction of the bridge deck is measured segment by segment. The perpendicular bisectors are used to draw perpendicular lines on the bridge deck to obtain the reference points and connect them to obtain the centerline of the bridge deck. As a reference line, the intersection of the centerline of the bridge deck with the width direction is combined to draw lines to obtain multiple bridge width lines and calculate the deviation value.
This effectively avoids measurement errors caused by deviations in bridge deck preparation or installation, improves measurement accuracy, and ensures the accuracy of deviation value calculation.
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Figure CN115950333B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of bridge engineering, and particularly relates to a method for measuring lateral deviation value of prefabricated box girder bridge deck. BACKGROUND
[0002] The box girder is a kind of girder in bridge engineering, which is hollow inside, has a bridge deck on the upper part, and has flanges on both sides of the bridge deck, similar to a box, and thus is named as such. The box girder is divided into single-box and multi-box. Among them, the box girder of reinforced concrete structure is divided into prefabricated box girder and cast-in-situ box girder. The prefabricated box girder can be prefabricated in an independent site in advance, and can be erected after the completion of the lower part of the engineering by combining with the bridge erecting machine, so as to accelerate the engineering progress and save the construction period, and thus has a high utilization rate.
[0003] When the prefabricated box girder is prepared and installed, deviation may occur on both sides in the width direction of the bridge deck. When the deviation value is within the preset range, the engineering requirement can be met, while when the deviation value exceeds the preset range, various engineering problems may be caused, and thus engineering correction is needed. Therefore, the accuracy of the measurement of the deviation value in the width direction of the bridge deck is very important.
[0004] The existing measurement method generally uses existing devices such as a tape measure and a range finder to directly measure on the bridge deck. However, this measurement method is limited by the measurement accuracy of the existing devices, and cannot scientifically and effectively cover each paragraph and position in the length direction of the prefabricated box girder bridge deck, resulting in low referenceability of the measurement data. SUMMARY
[0005] The present application aims to provide a method for measuring lateral deviation value of prefabricated box girder bridge deck, which can solve the technical problems of low accuracy and large error of the existing measurement method of the deviation value in the width direction of the prefabricated box girder bridge deck.
[0006] The present application is implemented by the following technical scheme:
[0007] A method for measuring lateral deviation value of prefabricated box girder bridge deck, comprising the following steps:
[0008] Obtaining a perpendicular bisector at each of two end faces in the length direction of the prefabricated box girder, and the foot points of the two perpendicular bisectors on the bottom plate of the prefabricated box girder are the midpoints on both sides in the length direction of the bottom plate of the prefabricated box girder;
[0009] Obtaining the foot points of the two perpendicular bisectors on the top plate of the prefabricated box girder bridge deck to obtain two reference points, and connecting the two reference points to obtain a bridge deck centerline;
[0010] Dividing the bridge deck centerline to obtain a plurality of segmented points;
[0011] A plurality of bridge width lines are obtained by drawing lines perpendicular to the center line of the bridge deck and intersecting the two sides of the bridge deck width direction of the prefabricated box girder bridge, with each of the reference points and each of the segment points as the starting point.
[0012] A deviation value group is calculated according to the lengths of the plurality of bridge width lines and the theoretical width of the prefabricated box girder bridge.
[0013] Optionally, the median lines are obtained at the two end faces of the prefabricated box girder in the length direction, including the following steps:
[0014] A pair of first points are obtained at the end faces of the large mileage end and the small mileage end of the prefabricated box girder, and each pair of the first points is symmetrically arranged about the center line of the bottom plate of the prefabricated box girder.
[0015] Two pairs of first circular arcs are drawn with the first points as the center and a preset radius at the end faces of the large mileage end and the small mileage end, and two second points are obtained by taking the intersection points of each pair of the first circular arcs.
[0016] Two median lines are obtained by drawing perpendicular lines from each of the second points as the starting point.
[0017] Optionally, the pair of first points are obtained at the end faces of the large mileage end and the small mileage end of the prefabricated box girder, including the following steps:
[0018] Two pairs of span plates are arranged on the bottom plate of the prefabricated box girder, and the two pairs of span plates are respectively located at the large mileage end and the small mileage end and are arranged on the two sides of the width direction of the bottom plate of the prefabricated box girder.
[0019] Geometric center lines of each of the span plates are obtained, and the geometric center lines are parallel to the length direction of the prefabricated box girder.
[0020] The foot points of each of the geometric center lines at the end faces of the large mileage end and the small mileage end are taken to obtain two pairs of reference points, and the reference points are taken as the starting points to obtain two pairs of the first points at a preset distance vertically above.
[0021] Optionally, the preset distance is 100 mm.
[0022] Optionally, the preset radius is c, and the preset radius satisfies the formula: c2=a+b, where: 2 2
[0023] a is one half of the distance between each pair of the first points;
[0024] b is the distance between the first point and the bridge deck of the prefabricated box girder minus 200 mm.
[0025] Optionally, the bridge width lines are obtained by drawing lines perpendicular to the bridge deck center line and intersecting the two sides of the precast box girder bridge width direction, including the following steps:
[0026] A plurality of first width division points are obtained by taking a plurality of pairs of points along the width direction of the large mileage end as the bridge deck center line is the axis of symmetry.
[0027] A plurality of second width division points are obtained by taking a plurality of pairs of points along the width direction of the small mileage end as the bridge deck center line is the axis of symmetry, and the plurality of second width division points correspond to the plurality of first width division points one by one.
[0028] A plurality of width division lines are obtained by connecting each first width division point and the corresponding second width division point.
[0029] A plurality of auxiliary segment points are obtained by dividing each width division line, and the plurality of auxiliary segment points of each width division line correspond to the plurality of segment points one by one.
[0030] A plurality of bridge width lines are obtained by connecting each segment point and the corresponding plurality of auxiliary segment points, and the connecting lines intersect the two sides of the precast box girder bridge width direction.
[0031] Optionally, the number of segment points is greater than or equal to 3.
[0032] Optionally, the number of segment points is 3.
[0033] Optionally, ink dot line drawing and connecting line are used.
[0034] Optionally, a tripod is used to measure the length of the bridge width line.
[0035] Compared with the prior art, the present application has the following advantages and beneficial effects:
[0036] The application provides a measurement method for the deviation value of the outer side of a prefabricated box girder bridge deck, which comprises the following steps: taking the bottom plate of the prefabricated box girder as a reference surface and the midpoint of the width direction of the prefabricated box girder as a reference point, obtaining the median line of the length direction of the prefabricated box girder at two end surfaces, respectively, and obtaining two reference point positions by using the median line as a perpendicular line on the bridge deck and connecting the two reference point positions, so as to obtain the bridge deck center line which is located directly above the center line of the bottom surface of the prefabricated box girder and is parallel to the center line, and the bridge deck center line can fully and effectively represent the deviation of the two sides of the width direction of the bridge deck, and then the bridge deck center line is segmented in the length direction, and a line is drawn perpendicularly to the bridge deck center line from each reference point position and each segmented point position, and the line intersects with the two sides of the width direction of the prefabricated box girder deck, so as to obtain a plurality of bridge width lines, and the length of each bridge width line is calculated and compared with the theoretical width, so as to obtain the deviation value, and whether the deviation value falls within a preset range can be determined according to the deviation value, and the method can effectively avoid the deviation and error caused by taking the bridge deck as a reference main body, and effectively improves the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS
[0037] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
[0038] Figure 1 A flow chart of the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application;
[0039] Figure 2 A point position schematic diagram of the end surface of the prefabricated box girder provided by the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application;
[0040] Figure 3 A point position schematic diagram of the bridge deck of the prefabricated box girder provided by the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application;
[0041] Figure 4 A schematic diagram of the bridge width line of the bridge deck of the prefabricated box girder provided by the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application;
[0042] Figure 5 A local schematic diagram of the span plate installation position provided by the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application;
[0043] Figure 6 A schematic diagram of the bottom plate of the prefabricated box girder provided by the measurement method for the deviation value of the outer side of the prefabricated box girder bridge deck provided by the embodiments of the application. DETAILED DESCRIPTION
[0044] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the embodiments and drawings, the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.
[0045] Please refer to Figure 1 The embodiment of the present application provides a kind of measurement method of prefabricated box girder bridge deck lateral deviation value, comprising the following steps:
[0046] S1, the length direction of the two end surfaces of the prefabricated box girder obtains median respectively, and the foot of the two median lines on the bottom plate of the prefabricated box girder is the midpoint of the length direction of the bottom plate of the prefabricated box girder;
[0047] S2, the foot of the two median lines is obtained on the top plate of the prefabricated box girder bridge deck, obtains two reference point positions, and the bridge deck center line is obtained by connecting two reference point positions;
[0048] S3, the bridge deck center line is divided, and a plurality of segmented points are obtained;
[0049] S4, each reference point position and each segmented point are taken as starting point, and the bridge deck center line is drawn vertically, and the two sides of the width direction of the prefabricated box girder bridge deck are intersected, and a plurality of bridge width lines are obtained;
[0050] S5, according to the length of a plurality of bridge width lines and the theoretical width of the prefabricated box girder bridge deck, deviation value group is calculated.
[0051] The measurement method of prefabricated box girder bridge deck lateral deviation value provided by the present application, by step S1, the bottom plate of the prefabricated box girder is taken as the reference surface, the midpoint of the width direction is taken as the reference point, and the median is obtained on the two end surfaces of the length direction of the prefabricated box girder, which is different from the existing method, and the measurement deviation caused by the deviation of bridge deck preparation or installation is directly excluded, by step S2, two reference point positions are obtained by using the median line in the bridge deck, and the bridge deck center line is obtained by connecting the two reference point positions, which is located on the bridge deck center line and parallel to the bridge deck center line, and can fully and effectively represent the deviation of the two sides of the bridge deck width direction, on this basis, by step S3, the bridge deck center line is segmented, and the bridge deck length direction is segmented, by step S4, each reference point position and each segmented point are taken as starting point, and the bridge deck center line is drawn vertically, and the two sides of the width direction of the prefabricated box girder bridge deck are intersected, that is, a plurality of bridge width lines are obtained, by step S5, the length of each bridge width line and the theoretical width are calculated and compared, and the deviation value is obtained, according to the deviation value, whether it falls within the preset range can be confirmed, and the method can effectively avoid the deviation and error caused by taking the bridge deck as the reference main body, and effectively improve the measurement accuracy.
[0052] Further, the two end faces of the precast box girder in the length direction are respectively obtained as the median lines, including the following steps:
[0053] S1.1, a pair of first point positions are obtained at the end faces of the large mileage end and the small mileage end of the precast box girder, and each pair of the first point positions is symmetrically arranged with the projection of the bottom plate of the precast box girder as the axis and the center line of the bottom plate of the precast box girder as the axis;
[0054] S1.2, two pairs of first circular arcs are drawn on the end faces of the large mileage end and the small mileage end with the first point positions as the centers and with a preset radius, and two second point positions are obtained by taking the intersection points of each pair of the first circular arcs;
[0055] S1.3, two median lines are obtained by respectively taking each second point position as the starting point to draw a perpendicular line.
[0056] Further, the pair of first point positions are obtained at the end faces of the large mileage end and the small mileage end of the precast box girder, including the following steps:
[0057] S1.1.1, two pairs of span plates are arranged on the bottom plate of the precast box girder, and the two pairs of span plates are respectively arranged at the large mileage end and the small mileage end and are respectively arranged on the two sides of the width direction of the bottom plate of the precast box girder;
[0058] S1.1.2, a geometric center line of each span plate is obtained, and the geometric center line is parallel to the length direction of the precast box girder;
[0059] S1.1.3, a pair of reference points are obtained by respectively taking the foot of the perpendicular of each geometric center line at the end face of the large mileage end and the small mileage end, and a pair of first point positions are obtained by taking points at a preset distance vertically above the reference points as the starting points.
[0060] Preferably, the preset distance is 100 mm.
[0061] Preferably, the preset radius is c, and the preset radius satisfies the formula: c 2 =a 2 +b 2 , wherein:
[0062] a is one half of the distance between each pair of the first point positions;
[0063] b is the distance between the first point position and the bridge deck of the precast box girder minus 200 mm.
[0064] Further, the multiple bridge width lines are obtained by respectively taking each reference point and each segmented point position as the starting point, drawing a line vertically to the center line of the bridge deck, and intersecting with the two sides of the width direction of the bridge deck of the precast box girder, including the following steps:
[0065] S4.1. Using the centerline of the bridge deck as the axis of symmetry, take multiple pairs of points evenly along the width direction of the large mileage end to obtain multiple first width division points;
[0066] S4.2. Using the centerline of the bridge deck as the axis of symmetry, take multiple pairs of points evenly along the width direction of the small mileage end to obtain multiple second width division points, and the multiple second width division points correspond one-to-one with the multiple first width division points.
[0067] S4.3 Connect each of the first width division points and the corresponding second width division points to obtain multiple width division lines;
[0068] S4.4. Divide each of the width-dividing lines equally to obtain multiple auxiliary segmentation points, and the multiple auxiliary segmentation points of each width-dividing line correspond one-to-one with the multiple segmentation points;
[0069] S4.5 Connect each segment point to the corresponding auxiliary segment points, and make the connecting lines intersect with both sides of the width direction of the precast box girder bridge deck to obtain multiple bridge width lines.
[0070] Preferably, the number of segmentation points is ≥3.
[0071] More preferably, the number of segmentation points is 3.
[0072] It should be noted that ink lines are drawn and connected using an ink line marker.
[0073] It should be noted that a tripod was used to measure the length of the bridge width line.
[0074] Example
[0075] This embodiment provides a method for measuring the deviation value of the outer side of a precast box girder bridge deck, including the following steps:
[0076] S1.1.1 Two pairs of span slabs are installed on the bottom slab of the precast box girder. The two pairs of span slabs are located at the high mileage end and the low mileage end, respectively, and are set on both sides of the width direction of the bottom slab of the precast box girder, as shown in the figure. Figure 5 and Figure 6 .
[0077] The span slab is fixed to the bottom plate of the precast box girder with two bolts. The length of the span slab is 10cm longer than the distance between the two bolts. The width of the span slab is 20cm and the thickness of the span slab is 3mm.
[0078] S1.1.2 Obtain the geometric centerline of each span slab, which is parallel to the length direction of the precast box girder.
[0079] S1.1.3, respectively take the foot of each geometric middle line on the large mileage end and the small mileage end face, get two pairs of reference points, take the point as the starting point, take the point at 100 mm vertically above, get two pairs of first point A1 and A2, see Figure 2 .
[0080] S1.2, respectively take the first point A1 and A2 as the center of circle, draw two pairs of first circular arc on the end face of the large mileage end and the small mileage end through the centering rule with the preset radius c, take the intersection point of each pair of first circular arc, get two second point C.
[0081] Wherein: the preset radius c satisfies the formula: c 2 =a2+b2, wherein: a is half of the distance between each pair of first point; b is the distance between the first point and the precast box girder bridge deck minus 200 mm, that is, the distance between the second point C and the precast box girder bridge deck is 200 mm.
[0082] S1.3, respectively take each second point as the starting point to make a vertical line, get two perpendicular lines CB.
[0083] S2, take the foot of two perpendicular lines CB on the precast box girder bridge deck top plate, get two reference point D1 and D2, connect the two reference points with ink tower, get the bridge deck center line D1D2, see Figure 3 .
[0084] S3, 4 divide the bridge deck center line D1D2, get 3 segment points.
[0085] S4.1, take the bridge deck center line D1D2 as the symmetry axis, evenly take 1 pair of point along the width direction of the large mileage end, get 2 first divided width point D1-1 and D1-2.
[0086] S4.2, take the bridge deck center line D1D2 as the symmetry axis, evenly take 1 pair of point along the width direction of the small mileage end, get 2 second divided width point D2-1 and D2-2.
[0087] S4.3, connect D1-1 and D2-1, connect D1-2 and D2-2, get 2 divided width line D1-1D2-1 and D1-2D2-2.
[0088] S4.4, divide the divided width line D1-1D2-1, get 3 auxiliary segment points E-1, F-1, G-1, divide the divided width line D1-2D2-2, get 3 auxiliary segment points E-2, F-2, G-2.
[0089] S4.5, adopt ink to connect each sub-point position with corresponding multiple auxiliary sub-point positions, and make the connecting line intersect with the two sides of the precast box girder bridge deck width direction, to obtain multiple bridge width lines, that is, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, see Figure 4 .
[0090] S5, adopt a level to measure the length of the above bridge width line, and calculate the deviation value group according to the length of the multiple bridge width lines and the theoretical width of the precast box girder bridge deck.
[0091] It should be noted that, in order to ensure the measurement accuracy, all readings are read to mm, that is, all data are accurate to 1mm.
[0092] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the present application. It should be understood that the above is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A method for measuring the deviation value of the outer side of a precast box girder bridge deck, characterized in that, Includes the following steps: A perpendicular line is obtained from each of the two end faces along the length of the precast box girder. The feet of the two perpendicular lines are located at the midpoints of the two sides of the bottom plate of the precast box girder along the length of the bottom plate. Take the feet of the two perpendicular lines from the top slab of the precast box girder bridge deck to obtain two reference points. Connect the two reference points to obtain the centerline of the bridge deck. Divide the bridge deck centerline into equal parts to obtain multiple segmented points; Starting from each of the aforementioned reference points and each of the aforementioned segment points, draw lines perpendicular to the centerline of the bridge deck and intersect with both sides of the width direction of the precast box girder bridge deck to obtain multiple bridge width lines; Based on the lengths of the bridge width lines and the theoretical width of the precast box girder bridge deck, a set of deviation values was calculated. Obtaining the perpendicular bisectors at the two end faces along the length of the precast box girder includes the following steps: A pair of first points are obtained from the end faces of the large mileage end and the small mileage end of the precast box girder, and the projection of each pair of first points on the bottom plate of the precast box girder is symmetrical about the centerline of the bottom plate of the precast box girder. Using the first point as the center, draw two pairs of first arcs with a preset radius on the end faces of the large mileage end and the small mileage end. Take the intersection of each pair of first arcs to obtain two second points. Draw perpendicular lines from each of the second points to obtain two perpendicular bisectors. The process of drawing lines perpendicular to the bridge deck centerline, starting from each of the reference points and each of the segment points, and intersecting with both sides of the precast box girder bridge deck width direction to obtain multiple bridge width lines, includes the following steps: Using the centerline of the bridge deck as the axis of symmetry, multiple pairs of points are uniformly selected along the width direction of the large mileage end to obtain multiple first width division points; Using the centerline of the bridge deck as the axis of symmetry, multiple pairs of points are uniformly taken along the width direction of the small mileage end to obtain multiple second width division points, and the multiple second width division points correspond one-to-one with the multiple first width division points. Connect each of the first width division points and the corresponding second width division points to obtain multiple width division lines; Each of the width-dividing lines is divided equally to obtain multiple auxiliary segmentation points, and the multiple auxiliary segmentation points of each width-dividing line correspond one-to-one with the multiple segmentation points; Each segment point is connected to the corresponding auxiliary segment points, and the connecting lines intersect with both sides of the width direction of the precast box girder bridge deck to obtain multiple bridge width lines.
2. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to claim 1, characterized in that, The process of obtaining a pair of first points at the end faces of the precast box girder at the high mileage end and the low mileage end includes the following steps: Two pairs of span plates are provided on the bottom plate of the precast box girder. The two pairs of span plates are located at the large mileage end and the small mileage end, respectively, and are respectively set on both sides of the width direction of the bottom plate of the precast box girder. The geometric centerline of each span slab is obtained, and the geometric centerline is parallel to the length direction of the precast box girder; Take the perpendicular feet of each geometric centerline at the end faces of the large mileage end and the small mileage end respectively to obtain two pairs of reference points. Using the reference points as the starting point, take points at a preset distance vertically above to obtain two pairs of the first point positions.
3. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to claim 2, characterized in that, The preset distance is 100mm.
4. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to claim 2, characterized in that, The preset radius is c, and the preset radius satisfies the formula: c 2 =a 2 +b 2 ,in: a is half the distance between each pair of the first points; b is the distance between the first point and the precast box girder bridge deck minus 200mm.
5. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to any one of claims 1-4, characterized in that, The number of segment points is ≥3.
6. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to claim 5, characterized in that, The number of segmentation points is 3.
7. The method for measuring the deviation value of the outer side of the precast box girder bridge deck according to any one of claims 1-4, characterized in that, The length of the bridge width line was measured using a tripod.
Citation Information
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