CN116690769B - Segment Liang Duanxian prefabricating method without partial matching beam - Google Patents
Segment Liang Duanxian prefabricating method without partial matching beam Download PDFInfo
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- CN116690769B CN116690769B CN202310447615.8A CN202310447615A CN116690769B CN 116690769 B CN116690769 B CN 116690769B CN 202310447615 A CN202310447615 A CN 202310447615A CN 116690769 B CN116690769 B CN 116690769B
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- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000009417 prefabrication Methods 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/22—Moulds for making units for prefabricated buildings, i.e. units each comprising an important section of at least two limiting planes of a room or space, e.g. cells; Moulds for making prefabricated stair units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
- B28B7/0055—Mould pallets; Mould panels
Abstract
The invention discloses a segment Liang Duanxian prefabricating method for partial non-matched beams, wherein for a zone span comprising N beam segments, the front N-1 beam segments are prefabricated by adopting the method without the matched beams, and the Nth beam segment is prefabricated by adopting the method with the matched beams. The method can eliminate the errors of the template system, under the premise that the template manufacturing precision meets a certain requirement, the accumulated deviation of the line shape is estimated through an algorithm, and the accumulated deviation is corrected by adopting a method with a matching beam at the ending section, so that the whole line shape control of the section bridge is realized.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a method for prefabricating a segment beam by a short line method, wherein a non-variable curvature/gradient part occupies a large proportion (the non-variable curvature/gradient part accounts for 60% -90% in most using methods according to statistics), and the method can be used.
Background
The segment prefabrication and assembly bridge refers to a bridge construction method (figure 1) for transversely dividing the bridge into segments, prefabricating the segments in a prefabrication field, and assembling the segments to form the bridge by transporting the segments to bridge positions, and has extremely wide application at home and abroad, and prefabricating the beam segments generally by adopting a long line method or a short line method; the long-line method is gradually eliminated in large projects due to the large field requirement; the sectional beam at the present stage is mainly prefabricated by a short line method. The stub method is to use the existing beam section which is already prefabricated as a matching beam with the adjacent beam section (the prefabrication method of the matching beam), and control the three-position coordinates of the measuring points by distributing the measuring points on the matching beam so as to achieve the purpose of controlling the spatial position relationship between the adjacent 2 beam sections (figure 1). The position control of the matched beams is of great importance for the stub method, because it is directly related to whether the beams Duan Neng of the prefabricated number are successfully assembled into a bridge on the site of the bridge.
When a method with a matching beam is adopted for prefabricating the segmental beam, the following problems exist:
(1) The prefabricated pedestal occupies the length of 2 beam sections at least, which is not beneficial to the arrangement of a narrow prefabricated field; along with the increasing application of prefabricated assembled bridges in urban reconstruction and expansion, the adoption of narrow prefabricated fields is always an inexhaustible choice;
(2) In order to ensure the prefabrication speed, the poured beam section needs to be moved to a matching position immediately after the side die is removed to serve as a matching beam of the next section; at this time, the strength of the concrete is not high; although not so much as to cause cracking, quality defects can still be caused in beam fields where individual management is not strict enough;
(3) The gradually rising segmental beam assembly line prefabrication process requires that the beam segments move to a maintenance station after the concrete is initially set; at this time, the matching beam and the beam section to be maintained need to move together on the pedestal, and the problems of heavy moving weight (the single-section beam generally has a weight of more than 100 t) and easy mass defect of concrete exist.
(4) The prefabrication process of the matched beam needs to measure the space position of the matched beam before and after pouring, and the single measurement takes more than 30 minutes, so that the production efficiency of the segmental beam is seriously affected;
(5) The process is complex, is not friendly to middle and small construction units, and is not beneficial to industrialized popularization of the segmental beams.
To avoid the difficulties caused by the use of matched beams, engineering technicians have attempted to perform segmental beam prefabrication using a process without matched beams. (1) Directly prefabricating by adopting a method without a matching beam, controlling the template into a bridge shape by adopting methods such as on-site stay wire and the like because errors caused by the size of the template cannot be eliminated, and solving the problem of line shape adjustment by adopting a large number of wet joints; (2) Because the relative position relation among 2 beam sections of the box beam cannot be determined, advanced tools such as a three-dimensional laser scanner and the like are adopted to scan the beam sections with prefabricated numbers, virtual pre-assembly is carried out, the relative spatial relation is determined in sequence, and the method is used for guiding the installation of the section beams.
The prefabrication method without the matched beam is a heuristic thought, but has the following problems: (1) Linear deviation caused by template size errors is not eliminated from the root, the on-site wet joints are excessive, and the advantage of industrial rapid production of the segmental beams cannot be exerted; (2) The three-dimensional scanning is extremely long in time consumption, and in addition, a very powerful computer is required for the post-processing of the daily point cloud data, so that the time consumption is long; meanwhile, effective and convenient lofting positioning data cannot be provided in the installation stage; the improved measures are not practical.
Disclosure of Invention
The invention aims at providing a method capable of eliminating a template system error aiming at a bridge with a straight line section and an equal curvature/gradient section, under the premise that the template manufacturing precision meets a certain requirement, the accumulated deviation of a line shape is estimated through an algorithm, and the accumulated deviation is corrected by adopting a method with a matching beam at a final section, so that the whole process line shape control of the section bridge is realized.
The technical scheme adopted by the invention for solving the technical problem is as follows: a method for prefabricating a segmental beam stub with a part of no matched beam, characterized in that for a zone span comprising N beam segments, the first N-1 beam segments are prefabricated by a method without matched beams, and the nth beam segment is prefabricated by a method with matched beams.
Preferably, the method comprises the following steps;
1) Classifying beam sections of one zone span according to a structural form, customizing a high-rigidity template according to the structural form, and arranging four groups of beam long lines (a, b, c, d) on the top surface and the bottom surface of the inner contour of the template, wherein the relative error of the inner contour of the template in the beam long direction (a, b, c, d) is required to be not more than 2mm;
2) Determining (a, b, c, d) errors by precision measurement, denoted da, db, dc, dd, respectively; the lateral displacement caused by the angular offset dθ of the longitudinal line of the template can be ignored when the lateral displacement is a high-order small quantity;
3) When the template manufacturing error is not considered, the direction vector of the beam section cross section is alpha 0 Taking the direction vector alpha after the template manufacturing error into consideration; alpha 0 R×α, where R is a direction conversion matrix, and the R matrix is solved by using a vector cross product operation according to the value of da, db, dc, dd;
4) Solving to obtain the center point coordinate of the next section, wherein the center point coordinate is a local coordinate system:
wherein, (x, y, z) is post-deviation node coordinates; (x) 1 ,y 1 ,z 1 ) The node coordinates under theoretical conditions without considering deviation; (x) 0 ,y 0 ,z 0 ) To consider the offset of the origin of coordinates after the deviation, solving according to da, db, dc, dd;
5) Gradually calculating to obtain coordinates of all the section points, and calculating the position deviation of the N-1 th section beam;
6) Converting the local coordinate system into an integral coordinate system to form a virtual pre-assembled line shape, and obtaining an integral N-1 segment three-dimensional coordinate and a transverse slope deviation;
7) Prefabricating an Nth beam section by adopting a method with a matched beam, and eliminating accumulated deviation.
Preferably, the classification of the structural form of the beam section root in the step 1) specifically includes: according to the length of the beam section, the top plate, the bottom plate, the web plate and the prestressed tooth blocks are different in form and size, and the beam section of one zone span is divided into a plurality of types.
Preferably, the deformation of the high-rigidity template in the step 1) is not more than 1mm in the concrete pouring process.
Preferably, step 8) is further included, specifically:
and 3) performing virtual operation on the steps 3) to 6), and if the elevation and axis deviation in the measurement result exceeds the standard allowable range, readjusting the template to reduce the error.
Preferably, in the step 8), the allowable range of the elevation and axis deviation specification is within 20 mm.
The invention at least comprises the following beneficial effects: the short line method segmental beam prefabrication process without the matched beam effectively solves the problems that the occupied area is large, the demolding time is greatly influenced by the matching requirement, the movement is difficult, the prefabrication work efficiency is low and the like in the traditional method; the construction efficiency of the segmental beam is effectively improved, the application range is enlarged, and the method has great significance in promoting the green and standardized construction of bridges in China.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a conventional prefabrication method;
FIG. 2 is a schematic illustration of bridge segment division;
FIG. 3 is a schematic illustration of 4 lengths of the in-mold profile control of the present invention;
FIG. 4 is a schematic illustration of the dimensional deviations of the inner contours of the templates of the present invention;
FIG. 5 is a schematic illustration of the lateral displacement caused by the template longitudinal line angular offset dθ of the present invention;
FIG. 6 is a schematic illustration of a cross-sectional directional shift caused by a template dimensional error;
in the figure: 1, pouring a beam section; 2 matching beams; 3, controlling a measuring point; 4 a first beam section; 5N-1 beam sections; 6 nth beam section.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that: the technical solutions and technical features provided in the sections including the following description in the present invention may be combined with each other without conflict.
In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The invention is further described in detail below with reference to the drawings and the implementation, and the implementation process is as follows:
as shown in fig. 1, the stub method refers to using an existing beam section that has been prefabricated as a matching beam 2 (a prefabricated method of a matching beam) of its adjacent beam section (a beam section 1 being poured), by laying control points 3 on the matching beam and controlling the three-dimensional coordinates of the points 3, the spatial positional relationship between the adjacent 2 beam sections is controlled.
As shown in fig. 2, the present invention provides a method for prefabricating segments Liang Duanxian with partially unmatched beams, wherein for a span comprising N beam segments, the first N-1 beam segments are prefabricated by the unmatched beam method, the nth beam segment is prefabricated by the matched beam method, and schematic diagrams of the first 4 to N-1 beam segments 5 and the nth beam segment 6 are shown in fig. 2.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: mainly comprises the following steps of;
1) As shown in fig. 3, classifying beam sections of one span according to a structural form, customizing a high-rigidity template according to the structural form, arranging four groups of beam long lines (a, b, c, d) on the top surface and the bottom surface of the inner contour of the template, and requiring that the relative error of the inner contour of the template in the beam long direction (a, b, c, d) is not more than 2mm;
2) By accurate measurement, as shown in fig. 4, the errors are determined (a, b, c, d), denoted da, db, dc, dd, respectively; the lateral displacement caused by the template longitudinal line angular offset dθ, as shown in fig. 5, may be ignored when the lateral displacement is a small higher order, such as da.
3) As shown in FIG. 6, the beam section has a directional vector of α when the die plate manufacturing error is not considered 0 Taking the direction vector alpha after the template manufacturing error into consideration; alpha 0 R×α, where R is a direction conversion matrix, and the R matrix is solved by using a vector cross product operation according to the value of da, db, dc, dd;
4) Solving to obtain the center point coordinate of the next section, wherein the center point coordinate is a local coordinate system:
wherein, (x, y, z) is post-deviation node coordinates; (x) 1 ,y 1 ,z 1 ) The node coordinates under theoretical conditions without considering deviation; (x) 0 ,y 0 ,z 0 ) To consider the offset of origin of post-deviation coordinates (local coordinate system), solve according to da, db, dc, dd;
5) According to the formulas in the steps 3) to 4), coordinates of all the section points can be calculated step by step, and the position deviation of the N-1 th section beam is calculated;
6) Converting the local coordinate system into an integral coordinate system to form a virtual pre-assembled line shape, and obtaining an integral N-1 segment three-dimensional coordinate and a transverse slope deviation;
7) Prefabricating an Nth beam section by adopting a method with a matched beam, and eliminating accumulated deviation.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the beam section root structural form in the step 1) is specifically classified as follows: according to the length of the beam section, the forms and the sizes of the top plate, the bottom plate, the web plate, the prestress tooth blocks and the like are different, and the beam section of one zone span is divided into a plurality of types, such as A/B/C.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the deformation of the high-rigidity template in the step 1) is not more than 1mm in the concrete pouring process.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: also comprises a step 8), which is specifically as follows:
and 3) performing virtual operation on the steps 3) to 6), and if the elevation and axis deviation in the measurement result exceeds the standard allowable range, readjusting the template to reduce the error.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: in the step 8), the allowable range of the elevation and axis deviation standard is generally within 20 mm.
The invention provides a segment beam prefabrication process of a part of a stub method without a matching beam, and provides a method capable of eliminating a template system error aiming at a bridge with a straight line segment and an equal curvature/gradient segment, wherein on the premise that the template manufacturing precision meets a certain requirement, the accumulated deviation of the line shape is estimated through an algorithm, and the accumulated deviation is corrected by adopting a method with the matching beam at a final segment, so that the whole process line shape control of the segment bridge is realized, and the problems of large occupied area, large influence of matching requirements on the form removal time, difficult movement, low prefabrication work efficiency and the like in the traditional method are effectively solved; the construction efficiency of the segmental beam is effectively improved, the application range is enlarged, and the method has great significance in promoting the green and standardized construction of bridges in China.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (5)
1. A segmental beam stub prefabricating method of a part of non-matching beam is characterized in that for a regional span comprising N beam segments, the front N-1 beam segments are prefabricated by adopting the method of the non-matching beam, and the Nth beam segment is prefabricated by adopting the method of the matching beam;
the method specifically comprises the following steps of;
1) Classifying beam sections of one zone span according to a structural form, customizing a high-rigidity template according to the structural form, and arranging four groups of beam long lines (a, b, c, d) on the top surface and the bottom surface of the inner contour of the template, wherein the relative error of the inner contour of the template in the beam long direction (a, b, c, d) is required to be not more than 2mm;
2) Determining (a, b, c, d) errors by precision measurement, denoted da, db, dc, dd, respectively; the lateral displacement caused by the angular offset dθ of the longitudinal line of the template can be ignored when the lateral displacement is a high-order small quantity;
3) When the template manufacturing error is not considered, the direction vector of the beam section cross section is alpha 0 Taking the direction vector alpha after the template manufacturing error into consideration; alpha 0 R×α, where R is a direction conversion matrix, and the R matrix is solved by using a vector cross product operation according to the value of da, db, dc, dd;
4) Solving to obtain the center point coordinate of the next section, wherein the center point coordinate is a local coordinate system:
wherein, (x, y, z) is post-deviation node coordinates; (x) 1 ,y 1 ,z 1 ) The node coordinates under theoretical conditions without considering deviation; (x) 0 ,y 0 ,z 0 ) To consider the offset of the origin of coordinates after the deviation, solving according to da, db, dc, dd;
5) Gradually calculating to obtain coordinates of all the section points, and calculating the position deviation of the N-1 th section beam;
6) Converting the local coordinate system into an integral coordinate system to form a virtual pre-assembled line shape, and obtaining an integral N-1 segment three-dimensional coordinate and a transverse slope deviation;
7) Prefabricating an Nth beam section by adopting a method with a matched beam, and eliminating accumulated deviation.
2. The method for prefabricating a segmental beam stub with a part of no matched beam according to claim 1, wherein the beam segments in the step 1) are classified according to structural forms as follows: according to the length of the beam section, the top plate, the bottom plate, the web plate and the prestressed tooth blocks are different in form and size, and the beam section of one zone span is divided into a plurality of types.
3. The method for segmental beam stubs prefabrication with partially unmatched beams according to claim 1, wherein said step 1) high stiffness form deforms no more than 1mm during concreting.
4. The method for segmental beam stubs prefabrication with partially unmatched beams according to claim 1, further comprising step 8), in particular:
and 3) performing virtual operation on the steps 3) to 6), and readjusting the template to reduce the error if the elevation and axis deviation in the measurement result exceeds the standard allowable range.
5. The method for prefabricating a segmental beam stub with a partially unmatched beam according to claim 4, wherein in step 8), the allowable range of the elevation and axis deviation specification is within 20 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310447615.8A CN116690769B (en) | 2023-04-24 | 2023-04-24 | Segment Liang Duanxian prefabricating method without partial matching beam |
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| CN202310447615.8A CN116690769B (en) | 2023-04-24 | 2023-04-24 | Segment Liang Duanxian prefabricating method without partial matching beam |
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| CN116690769B true CN116690769B (en) | 2023-11-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101028726A (en) * | 2006-09-21 | 2007-09-05 | 中铁大桥局股份有限公司 | Precast PC case beam process by short-line method |
| CN102733311A (en) * | 2012-07-02 | 2012-10-17 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Line shape control method for short line method segment prefabrication construction |
| CN115659479A (en) * | 2022-12-28 | 2023-01-31 | 湖北工业大学 | Bridge short-line method prefabricated construction beam section matching method |
| EP4124829A1 (en) * | 2021-07-30 | 2023-02-01 | Beijing Tusen Zhitu Technology Co., Ltd. | Map construction method, apparatus, device and storage medium |
| CN115922168A (en) * | 2023-01-09 | 2023-04-07 | 中交第二航务工程局有限公司 | Steel box girder segment non-matching assembling manufacturing and precision control method |
-
2023
- 2023-04-24 CN CN202310447615.8A patent/CN116690769B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101028726A (en) * | 2006-09-21 | 2007-09-05 | 中铁大桥局股份有限公司 | Precast PC case beam process by short-line method |
| CN102733311A (en) * | 2012-07-02 | 2012-10-17 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Line shape control method for short line method segment prefabrication construction |
| EP4124829A1 (en) * | 2021-07-30 | 2023-02-01 | Beijing Tusen Zhitu Technology Co., Ltd. | Map construction method, apparatus, device and storage medium |
| CN115659479A (en) * | 2022-12-28 | 2023-01-31 | 湖北工业大学 | Bridge short-line method prefabricated construction beam section matching method |
| CN115922168A (en) * | 2023-01-09 | 2023-04-07 | 中交第二航务工程局有限公司 | Steel box girder segment non-matching assembling manufacturing and precision control method |
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