CN112942141B - Segment beam matching prefabrication method - Google Patents
Segment beam matching prefabrication method Download PDFInfo
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- CN112942141B CN112942141B CN202110366799.6A CN202110366799A CN112942141B CN 112942141 B CN112942141 B CN 112942141B CN 202110366799 A CN202110366799 A CN 202110366799A CN 112942141 B CN112942141 B CN 112942141B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention relates to a matching prefabrication method of a section beam, which comprises the following steps: s1, prefabricating two adjacent sections of sectional beams on a prefabricating table according to design sizes, and reserving a post-pouring area at the joint of the two sections of sectional beams, wherein the post-pouring area is reserved at the end part of one section of sectional beam; s2, matching two prefabricated section beams on a matching pedestal, wherein the post-pouring area is positioned between the two section beams, and adjusting the spatial positions of the two section beams by utilizing beam surface characteristic measuring points according to the geometric relative relationship between the two section beams until the deviation meets the requirement; s3, reinforcing and locking two sections of segmental beams, and arranging a pouring template in a post-pouring area; and S4, pouring concrete in the post-pouring area to form a post-pouring belt. The sequence of matching and prefabricating the existing section beams is enriched, so that construction organizations have more optimization options, and the technical problem of long construction period when the existing construction method is used for prefabricating the section beams is solved.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a section beam matching prefabricating method.
Background
At present, more and more prestressed concrete bridges in China adopt a segmental prefabrication and assembly construction method, and the core of the construction method lies in the prefabrication of segmental beams. The prefabrication by the stub method is a common method for prefabricating bridge sections. For the prefabrication principle of the conventional stub method, referring to fig. 1, a large-span continuous beam is divided into a plurality of segments according to a certain principle, 6 control measurement points are arranged on the top surface of each segment, and the spatial position of each segment can be determined according to the three-dimensional coordinates of the control measurement points under the overall coordinate system. The specific operation is as follows: measuring and lofting each segment on the prefabricated pedestal by using a total station and a level gauge and referring to the fixed end die datum; and after the casting of the segment is finished, performing completion measurement in time, acquiring local coordinates and elevations of control points on the top surface of the segment, and then transforming the local coordinates to overall coordinates through reverse transformation to obtain the completion line type of the segment. And obtaining target matching data of the segment to be poured in the local coordinate system through the completion coordinate of the previous segment and the theoretical coordinate of the segment to be poured in the global coordinate system. According to target matching data, accurately measuring and positioning the matching beam, after pouring of the pouring beam is completed, performing completion measurement on the pouring beam and the matching beam, and simultaneously acquiring local coordinates and elevations of two segment top surface control points; and calculating the completion coordinates of the beam to be poured according to the whole completion coordinates and the local completion coordinates of the control points of the matched beam sections, and completing matched pouring of each section by circulating the process.
Namely, when each section of beam is prefabricated by a conventional short-line method, the beam can be prefabricated section by section, the previous section is prefabricated first, the next section is prefabricated by taking the previous section as a reference, and the like, and the process is circulated to finish the matched prefabrication of each section. Therefore, the conventional short-line method prefabricated segmental beam has the defects of relatively single pouring sequence and fixation; for the beams with more sections, the defect of long construction period exists.
Disclosure of Invention
The invention aims to change the limitation that the prior segmental beam matching and prefabricating construction must be strictly matched according to a single sequence, so that more options are available in the on-site pouring sequence, and the technical problem of long total construction period in the segmental beam prefabricating construction is solved.
The purpose of the invention is realized by the following technical scheme:
a segment beam matching prefabrication method comprises the following steps:
s1, prefabricating two adjacent sections of sectional beams on a prefabricating table according to design sizes, and reserving a post-pouring area at the joint of the two sections of sectional beams, wherein the post-pouring area is reserved at the end part of one section of sectional beam;
s2, matching two prefabricated section beams on a matching pedestal, wherein the post-pouring area is positioned between the two section beams, and accurately adjusting the space geometric positions of the two section beams by using beam surface characteristic measuring points according to the geometric relative relationship between the two section beams until the deviation meets the requirement;
s3, reinforcing and locking the two sections of segmental beams, and arranging a pouring template in a post-pouring area;
and S4, pouring concrete in the post-pouring area to form a post-pouring belt.
As a preferable embodiment of the above scheme, in the step S1, the width of the post-cast zone is 15-30cm.
As a preferred embodiment of the above scheme, the width of the post-cast zone is 20cm.
In a preferred embodiment of the above scheme, a section beam with a post-cast area reserved is extended into the post-cast area by a steel reinforcement framework inside the section beam, so that a post-cast strip formed by casting can be firmly combined with an original structure.
As a preferred embodiment of the above scheme, in step S1, one end of the segment beam, at which the post-cast region is not reserved, is provided, and an end surface of the segment beam is provided with an outward-protruding tooth block.
As a preferred embodiment of the above scheme, a long hole for laying the prestressed steel strand is reserved in the segment beam.
As a preferred embodiment of the above scheme, in the process of prefabricating the section beam in step S1, a central line and four elevation characteristic measurement points are respectively embedded in the beam surface of the two sections of the section beam, wherein the two central line measurement points are arranged along the beam axis, and the data of the beam surface characteristic measurement points are accurately measured after the casting is completed.
In step S2, when the two prefabricated section beams are matched on the matching pedestal, the relative geometric relationship between the two beams is accurately adjusted and positioned by using the central line and the elevation measurement point of the beam surface according to the data of measurement and calculation, so as to achieve the required deviation and precision.
As a preferred embodiment of the above scheme, when step S2 is performed, one of the segmental beams is fixed, and the spatial position of the other segmental beam is adjusted according to the geometric relative relationship between the two segmental beams until the deviation meets the requirement.
As a preferred embodiment of the above scheme, before step S3, the joining surface of the segment beam with the post-cast zone is roughened or chiseled.
As a preferred embodiment of the above scheme, after the post-cast strip casting in step S4 is completed, completion measurements are performed after the concrete is solidified, and the final geometric relationship of the two segmental girders is determined.
The invention has the following beneficial effects: the invention provides a segmental beam matching prefabrication method, which is characterized in that during construction, each segmental beam can be prefabricated directly, and a post-cast area is reserved for the matched end part of any two adjacent segmental beams; and then adjusting the space position between two adjacent sections of prefabricated section beams, pouring concrete in a post-pouring area to form a post-pouring belt by taking the end part of the other section as one side of a post-pouring belt pouring template, and realizing the matching between the two sections of section beams after the post-pouring belt is combined with the original section beams. Therefore, by the method, each section of beam can be prefabricated, the post-pouring area reserved at the end part of each section of beam is used as an adjusting and matching area, the space position between two adjacent sections of beams at two ends is adjusted, and the post-pouring area is poured in the post-pouring area to form the post-pouring belt, so that the section beam meeting the design requirement can be obtained. Namely, in this scheme, can prefabricate multistage festival section roof beam simultaneously, can match multistage festival section roof beam simultaneously and carry out pouring of post-cast strip, utilize the mode of multiple spot synchronous construction promptly, can shorten the prefabrication time limit for a project greatly.
Drawings
FIG. 1 is a schematic diagram of a conventional stub-method prefabricated bridge segment;
FIG. 2 is a schematic structural diagram of the cast-in post-cast strip completed by the scheme;
FIG. 3 is a schematic structural view of a sectional beam according to the present embodiment;
fig. 4 is a schematic structural view of the scheme, wherein the beams are matched with adjacent two end sections and a post-cast strip is poured.
The specific structure in the figure illustrates that: 1 section of roof beam, 11 post-cast zones, 12 steel reinforcement frameworks, 13 tooth blocks, 14 slotted holes, 2 post-cast strips, 3 matching pedestals.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are given in the accompanying drawings.
A segment beam matching prefabrication method comprises the following steps:
s1, referring to FIG. 3, respectively prefabricating two sections of adjacent section beams 1 on a prefabricating platform according to design sizes, respectively embedding central lines and elevation characteristic measurement points on beam surfaces of the two sections of section beams during prefabrication, wherein the central lines are two in measurement point and are arranged along the beam axis, the elevation measurement points are four in measurement point, and accurately measuring beam surface characteristic measurement point data after pouring is finished; a post-pouring area is reserved at the joint of two sections of the section beams 1, wherein the post-pouring area is reserved at the end part of one section of the section beam; wherein the width of the reserved post-pouring area 11 is 15-30cm, preferably 20cm. The steel reinforcement framework 12 inside the section beam 1 extends into the post-cast area 11, so that the post-cast strip 2 formed by casting can be firmly combined with the original structure;
s2, referring to FIG. 4, matching two sections of prefabricated section beams 1 on a matching pedestal 3, wherein a post-pouring area is located between the two sections of section beams 1, fixing one section of section beam 1, and accurately adjusting the spatial geometric position of the other section beam 1 by using a beam surface characteristic measuring point according to the geometric relative relation between the two sections of section beams 1 until the deviation meets the requirement;
when the prefabricated two sections of section beams 1 are matched on the matching pedestal 3, the relative geometric relationship between the two beams is accurately adjusted and positioned by using the central line and the elevation measurement point of the beam surface according to the data of measurement and calculation to achieve the required deviation and precision;
s3, reinforcing and locking the two sections of the segmental beams 1, performing roughening or chiseling on the joint surfaces of the segmental beams 1 with the post-pouring areas 11, and arranging pouring templates in the post-pouring areas 11;
and S4, pouring concrete in the post-pouring area 11 to form a post-pouring strip 2, performing completion measurement after the concrete is solidified, and determining the final geometric relationship of the two sections of segmental beams.
Therefore, in the scheme, during construction, each section of section beam can be directly prefabricated, then the space position between two adjacent sections of prefabricated section beams is adjusted, the end part of the other section is used as one side of a post-cast strip pouring template, concrete is poured in a post-cast area to form a post-cast strip, and the post-cast strip is combined with the original section beam, so that matching between the two sections of section beams can be realized. This scheme can prefabricate multistage festival section roof beam simultaneously, can match multistage festival section roof beam simultaneously and carry out pouring of post-cast strip, utilizes the mode of multiple spot synchronous construction promptly, can shorten the prefabrication time limit for a project greatly.
In step S1, one end of the segment beam 1, at which the post-cast region 11 is not reserved, is provided with a convex tooth block 13 on an end surface thereof. Therefore, after the post-cast strip 2 is poured, a groove corresponding to the tooth block 13 is formed in the end face of the post-cast strip 2, and alignment and clamping of each section of beam can be facilitated during later bridge hoisting and installation.
As a preferred embodiment of the above solution, a long hole 14 for laying the prestressed steel strand is reserved in the segment beam 1. The reserved long hole 14 can be used for laying and tensioning prestressed steel strands during bridge hoisting.
The above description is only a preferred embodiment of the present invention, but not intended to limit the scope of the invention, and all simple equivalent changes and modifications made in the claims and the description of the invention are within the scope of the invention.
Claims (9)
1. A segment beam matching prefabrication method is characterized by comprising the following steps:
s1, prefabricating two adjacent sections of sectional beams on a prefabricating table according to design sizes, and reserving a post-pouring area at the joint of the two sections of sectional beams, wherein the post-pouring area is reserved at the end part of one section of sectional beam;
s2, matching two prefabricated section beams on a matching pedestal, wherein the post-pouring area is positioned between the two section beams, and accurately adjusting the space geometric positions of the two section beams by using beam surface characteristic measuring points according to the geometric relative relationship between the two section beams until the deviation meets the requirement;
s3, reinforcing and locking two sections of segmental beams, and arranging a pouring template in a post-pouring area;
s4, pouring concrete in the post-pouring area to form a post-pouring belt;
the method comprises the following steps of reserving a section beam with a post-pouring area, wherein a steel reinforcement framework inside the section beam extends into the post-pouring area, so that a post-pouring belt formed by pouring can be firmly combined with an original structure.
2. A method of matched prefabrication of a section beam according to claim 1, including the steps of: in step S1, the width of the post-cast zone is 15-30cm.
3. A method of matched prefabrication of a section beam according to claim 2, including the steps of: the width of the post-pouring area is 20cm.
4. A method of matched prefabrication of a section beam as claimed in claim 1, including the steps of: in the step S1, one end of the section beam, which is not reserved with a post-pouring area, is provided with an outward convex tooth block on the end surface.
5. A method of matched prefabrication of a section beam according to claim 1, including the steps of: and a long hole for laying the prestress steel strand is reserved in the section beam.
6. A method of matched prefabrication of a section beam as claimed in claim 1, including the steps of: in the process of prefabricating the section beams in the step S1, respectively embedding central lines and elevation characteristic measurement points on beam surfaces of two sections of the section beams, wherein the central line measurement points are two and are arranged along the beam axis, and the elevation measurement points are four, and accurately measuring beam surface characteristic measurement point data after pouring is finished;
in step S2, when the two prefabricated section beams are matched on the matching pedestal, the relative geometric relationship between the two beams is accurately adjusted and positioned by using the center line and the elevation measurement point of the beam surface according to the data of measurement calculation, so as to achieve the required deviation and accuracy.
7. A method of matched prefabrication of a section beam according to claim 1, including the steps of: before the step S3 is carried out, the joint surface of the section beam with the post-cast area is subjected to roughening or chiseling.
8. A method of matched prefabrication of a section beam as claimed in claim 7, including the steps of: when the step S2 is carried out, one section of the section beams is fixed, and the spatial position of the other section of the section beams is adjusted according to the geometric relative relationship between the two sections of the section beams until the deviation meets the requirement.
9. A method of matched prefabrication of a section beam according to claim 1, including the steps of: and (5) after the post-cast strip in the step (S4) is poured, performing completion measurement after the concrete is solidified, and determining the final geometric relationship of the two sections of segmental beams.
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| KR100510254B1 (en) * | 2005-04-13 | 2005-08-26 | 주식회사 인터컨스텍 | Precasting method of spliced prestressed concrete girder segment and the segment precasted by above method |
| CN101476291B (en) * | 2009-01-21 | 2011-04-06 | 中铁一局集团有限公司 | Segment-assembling simply supported box girder movable falsework construction method |
| CN105625188A (en) * | 2016-01-13 | 2016-06-01 | 中铁三局集团有限公司 | Construction method for 48m sectional beam of passenger railway based on BIM technology |
| CN108396637A (en) * | 2018-04-28 | 2018-08-14 | 福州大学 | Based on short-line prefabrication assembly girder construction and its construction method |
| CN109629421B (en) * | 2018-11-20 | 2020-11-27 | 同济大学 | Construction method for segment beam additionally provided with steel pipe and horizontally distributed steel bars |
| CN109680615B (en) * | 2018-12-30 | 2021-08-17 | 广东瀚阳轨道信息科技有限公司 | Three-dimensional coordinate measuring construction method of short-line method section beam |
| CN110777669A (en) * | 2019-11-15 | 2020-02-11 | 中铁北京工程局集团有限公司 | High-speed rail continuous beam short line matching prefabricated cantilever assembly line shape control method |
| CN112195781B (en) * | 2020-09-09 | 2022-06-21 | 瀚阳国际工程咨询有限公司 | Method for prefabricating section precast bridge by combining long and short line method with bidirectional matching method |
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