CN113718632A - Bent cap structure that segmentation prefabrication was assembled - Google Patents

Bent cap structure that segmentation prefabrication was assembled Download PDF

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Publication number
CN113718632A
CN113718632A CN202110962816.2A CN202110962816A CN113718632A CN 113718632 A CN113718632 A CN 113718632A CN 202110962816 A CN202110962816 A CN 202110962816A CN 113718632 A CN113718632 A CN 113718632A
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CN
China
Prior art keywords
post
cast
precast
bent cap
assembled
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CN202110962816.2A
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Chinese (zh)
Inventor
马骉
赵晓梅
王巍
吴琰
杜林清
苏俭
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Shanghai Municipal Engineering Design Co ltd
Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Co ltd
Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Application filed by Shanghai Municipal Engineering Design Co ltd, Shanghai Municipal Engineering Design Insitute Group Co Ltd filed Critical Shanghai Municipal Engineering Design Co ltd
Priority to CN202110962816.2A priority Critical patent/CN113718632A/en
Publication of CN113718632A publication Critical patent/CN113718632A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention provides a cover beam structure prefabricated and assembled in a split manner, wherein the transverse section of the cover beam consists of a left prefabricated beam, a right prefabricated beam and a middle post-cast cross beam; the pier is characterized in that the bent cap is positioned at the top of the pier column; the left precast beam and the right precast beam are through long along the length direction of the cover beam and are connected through post-cast cross beams which are distributed at intervals; the left side precast beam and the right side precast beam are reserved with discontinuous trapezoid notches at the upper parts, and assembled to form a trapezoid post-pouring cross beam notch structure which is arranged at intervals along the length direction of the cover beam. The bent cap structure has the advantages of small on-site construction workload, strong operability, high construction speed, good structural integrity, good durability and the like. The bent cap is suitable for bent caps which are heavy and need to be transported in sections.

Description

Bent cap structure that segmentation prefabrication was assembled
Technical Field
The invention belongs to the technical field of bridge prefabrication and assembly, and particularly relates to a cover beam structure prefabricated and assembled in a segmented mode.
Background
The bridge prefabrication and assembly technology is rapidly developed in recent years, and comprises the links of factory prefabrication, transportation and hoisting of prefabricated parts, field connection technology and the like. The transportation and hoisting of the prefabricated parts are limited by the conditions of transportation along the line and on-site hoisting, and the weight of the prefabricated parts needs to be controlled.
The viaduct bent cap has the characteristics of concentrated stress, large size and heavy weight. The structural dimensions of the force transmission member between the upper structure and the lower structure of the bridge are related to the width and span of the bridge, the position of the pier column, and the like. For a conventional 30 m-span viaduct, the weight of the bent cap of the bidirectional 6 lanes is about 240-250 t; the urban viaduct and the overpass have larger span and bridge width at the splitting and converging points of the ramps, the road crossing and the like, and the weight of the bent cap exceeds 250 t. And the weight of the transportation component which can be carried by the existing medium and small bridges is less than or equal to 180 t. Therefore, a large number of viaduct bent caps need to be prefabricated and installed in sections or in pieces.
The bent cap structure of the existing sectional prefabrication and assembly construction method is a mode of segmenting the bent cap along the length direction.
CN 105780663 a discloses a large-span capping beam prefabrication and assembly method and a large-span capping beam thereof, which adopts a mode of prefabricating and pouring in stages and gradually tensioning steel bundles in each stage to perform integral bracket-free construction of the large-span capping beam, a prefabricated U-shaped beam member is used as a bottom die, and after the U-shaped beam member is hoisted in place, the hollow part of a U-shaped groove is cast in situ.
CN106638313A discloses a construction technical method for semi-prefabricating a large-scale bent cap, which is improved on the basis of the CN 105780663A. This patent takes measures such as the installation prevents that the pull rod rises, the shell bottom adopts fibre concrete at the inslot of prefabricated U type groove, solves the secondary concrete pouring in-process and rises mould deformation and the easy fracture scheduling problem of prefabricated shell concrete.
CN 109183629A discloses a precast assembly method for a large cantilever bent cap, which is characterized in that the bent cap is divided into three sections along the length direction, and the splicing surfaces of the cantilever sections of the bent cap are closely attached through an adhesive; and sequentially penetrating the prestressed tendons through the prefabricated section of the pipeline and then tensioning. Belongs to a segment prefabrication and assembly method of a glue joint method.
CN 208533353U discloses a prefabricated type bent cap, which is divided into a plurality of prefabricated members along the length direction, and the plurality of prefabricated members comprise a channel-shaped member and a plurality of strip-shaped members. The strip-shaped pieces are connected with the channel-shaped pieces through solidified concrete slurry, and the complete bent cap is formed after splicing.
And after the bent cap is segmented along the length direction in part of constructed projects, longitudinal steel bar connection is carried out on site, wet joints are poured, prestress is tensioned, and the connection construction of joints is completed. The segmentation approach is similar to patent CN 109183629 a except that the seam is changed from a segmented dry joining method to a conventional wet seam.
The prior art can satisfy the design construction requirement of prefabricating and assembling, but has the problem that the site operation is complicated, mainly embodies in three aspects: firstly, temporary supports are required to be arranged to support the prefabricated parts; secondly, a cast-in-place template is required to be arranged in the wet joint scheme; thirdly, a prestressed steel beam is penetrated in the rear. The problems of the three aspects increase the workload and the construction risk of site construction, and reduce the efficiency and the advantages of prefabrication and assembly.
Disclosure of Invention
The invention overcomes the problems in the prior art, provides the bent cap structure adopting the segmented prefabrication and assembly method from the perspective of convenient, fast and safe field construction, and achieves the purposes of no need of arranging a temporary support, no need of binding and welding reinforcing steel bars on the field during field component installation, small volume of beam concrete poured on the field, no need of additionally arranging a template, convenient and fast construction, strong field operability, and good integrity and durability of the assembled bent cap structure.
In order to achieve the purpose of the invention, the technical scheme provided by the invention is as follows:
a cover beam structure assembled by segmental prefabrication is characterized in that the transverse section of a cover beam consists of a left prefabricated beam, a right prefabricated beam and a middle post-cast cross beam; the bent cap is positioned at the top of the pier column; the left precast beam and the right precast beam are through long along the length direction of the cover beam and are connected through post-cast cross beams which are distributed at intervals; the left side precast beam and the right side precast beam are reserved with discontinuous trapezoid notches at the upper parts, and assembled to form a trapezoid post-pouring cross beam notch structure which is arranged at intervals along the length direction of the cover beam.
Furthermore, the post-cast beam notch also serves as a post-cast beam template, and no template is required to be arranged on site.
Furthermore, during on-site construction, the bent cap is directly installed in place on the pier column without arranging a bent cap temporary supporting structure.
Furthermore, the notch of the post-cast cross beam is of an open structure at the upper opening, and the inserted post-cast cross beam reinforcing mesh is installed, so that the inserted post-cast cross beam reinforcing mesh can be conveniently and quickly installed in place. And a transverse reserved steel bar is arranged at the top of the post-cast cross beam.
Furthermore, the post-cast beam steel bar net sheets and the transverse reserved steel bar planes at the top of the post-cast beam are arranged in a staggered mode, welding connection is not needed, and connection and anchoring are achieved through staggered overlapping of the steel bars.
Furthermore, the post-cast beam reinforcing mesh sheet comprises closed reinforcing steel bars, transverse reinforcing steel bars and vertical reinforcing steel bars.
Furthermore, the horizontal reserved steel bar that post-cast crossbeam top set up, including left side precast beam reserved steel bar and right side precast beam reserved steel bar.
Furthermore, joints of the bent cap and the pier columns are connected by grouting sleeves or grouting metal corrugated pipes, and wet joint materials of the bent cap and the pier columns are high-performance concrete.
The invention discloses a construction step of a cover beam structure prefabricated and assembled in segments, which comprises the following steps:
1. prefabricating a left precast beam and a right precast beam in a factory, and reserving post-cast beam notches and reinforcing steel bars at intervals;
2. transporting the left precast beam and the right precast beam to the site, and respectively and independently hoisting the left precast beam and the right precast beam to be placed on the pier upright post;
3. constructing joints of the capping beams and the pier columns, wherein the joints are connected by grouting sleeves and grouting metal corrugated pipes, and high-performance concrete is used as a wet joint material;
4. inserting type post-cast beam reinforcing mesh sheets are integrally installed in post-cast beam notches reserved between the left side precast beam and the right side precast beam, and the post-cast beam reinforcing mesh sheets and the transverse reserved reinforcing steel bar planes at the top of the post-cast beam are arranged in a staggered mode without being connected by welding;
5. and pouring post-cast beam concrete to finish the capping beam assembly construction.
According to the split prefabricated and assembled bent cap structure provided by the invention, two prefabricated beams are through long along the length direction and are connected through the cross beams distributed at intervals, and the aim of simplifying the field construction operation is fulfilled by utilizing the characteristics that a single prefabricated main beam is complete in a prestress structure system along the length direction and has independent bearing capacity during construction. When the prefabricated section is installed, the prefabricated section is directly hoisted and placed on the top of the pier column without adopting a temporary support or a fixing measure; the notches of the left and right precast sections of the bent cap are also used as templates after being assembled, and no post-pouring section template is required to be additionally arranged on site; the steel bars of the post-pouring cross beam are quickly installed in place by adopting inserted steel bar meshes, and the reserved steel bars and the steel bar meshes at the post-pouring groove opening are arranged at intervals and can be connected without welding; the crossbeam is interrupted to be arranged, and cast-in-place crossbeam concrete is small. The crossbeam plays the horizontal distribution effect, makes the common atress of both sides prefabricated section, satisfies the bearing capacity requirement, solves the poor problem of beam joint deformation because the displacement of both sides bent cap is poor simultaneously.
Compared with the prior art, the invention has the following beneficial effects:
1. the two precast girders are through long along the length direction and are connected through cross beams distributed at intervals, and the aim of simplifying the field construction operation is fulfilled by utilizing the characteristics that the single precast girder has complete prestress structure system along the length direction and has independent bearing capacity during construction.
2. The two precast beams are connected through the post-pouring cross beam on the upper portion, the cross beam plays a role in transverse distribution, the precast beams on two sides are stressed together, the bearing capacity requirement is met, and the problem of poor beam joint deformation caused by poor displacement of the cover beams on two sides is solved.
3. And the shearing-resistant wet joint is adopted, so that the arrangement of joint reinforcing steel bars is simplified. The seam width between two precast beams is only about 20mm, the ratio of the seam width to the seam height of the post-pouring wet seam is very small, and the stress of the transverse wet seam is mainly shear resistance. The plane positions of the reserved transverse steel bars and the post-cast transverse steel bars of the two precast beams are staggered, and welding connection is not needed. The post-cast beam notch is of an open-top structure, so that the inserted post-cast beam reinforcing mesh sheet can be conveniently and quickly installed in place. The joint reinforcing steel bars adopt reinforcing steel bar meshes, annular reinforcing steel bars and other forms, and connection and anchoring are realized through staggered lapping of the reinforcing steel bars.
4. During site operation, the prefabricated bent cap is directly installed at the top of the pier in place, and a temporary supporting structure of the prefabricated section of the bent cap is not needed.
5. The reserved notches of the left and right precast beams are also used as post-cast beam templates after being assembled, and no template is required to be arranged on site.
6. The invention has the advantages of small on-site construction workload, strong operability, high construction speed, good structural integrity, good durability and the like.
Drawings
FIG. 1 is a schematic elevational view of a segmented precast assembled bent cap construction of the present invention; wherein, (1) the invention is horizontal to the elevation sketch map of the bridge, (2) the invention is along the vertical sketch map of the bridge.
Fig. 2 is a schematic view of a prefabricated assembly structure of a segmented prefabricated assembled bent cap structure according to the present invention.
FIG. 3 is a schematic view of a construction sequence of a segmented precast assembled bent cap beam construction of the present invention; the method comprises the following steps of (1) installing and positioning prefabricated sections of the capping beam, (2) installing post-cast beam reinforcing mesh sheets, (3) installing and positioning reinforcing mesh sheets, and (4) casting post-cast groove opening concrete.
Fig. 4 is a schematic plane position diagram of a post-cast cross beam steel bar of the segmented prefabricated and assembled bent cap structure of the invention.
In the figure:
1-capping beam, 2-pier column, 3-left precast beam, 4-right precast beam, 5-post-cast cross beam, 6-left precast beam reserved steel bar, 7-left precast beam reserved steel bar, 8-right precast beam reserved steel bar, 9-right precast beam reserved steel bar, 10-closed steel bar, 11-transverse steel bar, 12-vertical steel bar and 13-top surface distribution steel bar.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Examples
The specific construction and construction method of the cover beam structure prefabricated and assembled in segments are given in detail by the following embodiments and the attached drawings.
The invention discloses a cover beam structure prefabricated and assembled in segments, which is shown in the accompanying drawings 1-4 and is described as follows by combining the accompanying drawings:
1. as shown in fig. 1, the capping beam 1 is directly installed on the top of the pier stud 2 without providing a temporary capping beam support structure. The joints of the bent cap 1 and the pier upright post 2 are connected by grouting sleeves or grouting metal corrugated pipes, and the wet joint materials are high-performance concrete.
The transverse section of the bent cap 1 consists of a left precast beam 3, a right precast beam 4 and a middle post-cast cross beam 5; the left precast beam 3 and the right precast beam 4 are through long along the length direction of the cover beam 1 and are connected through post-cast cross beams 5 which are distributed at intervals.
2. As shown in fig. 2, interrupted trapezoidal notches are reserved at the upper parts of the left precast beam 3 and the right precast beam 4, after the left precast beam 3 and the right precast beam 4 are connected with the stand column on site, interrupted trapezoidal post-cast troughs are formed in the middle of the left precast beam 3 and the right precast beam 4, and the notch structures of the post-cast cross beam 5 are arranged at intervals along the length direction of the cover beam 1. The notch of the post-cast beam 5 is also used as a template of the post-cast beam 5, and no template is needed to be arranged on site.
3. The total height, the transverse bottom width and the top width of the beam notch structure shown in fig. 2 and the length of the beam shown in fig. 1 are determined according to the overall structural size of the capping beam and the concrete material of the post-cast section, and the requirements of staggered overlapping of reinforcing steel bars and anchoring force transmission length are met.
4. As shown in fig. 3, the capping beam installation and construction sequence is as follows:
(1) installing the left precast beam 3 and the right precast beam 4 in place → (2) preparing the post-cast beam reinforcing mesh sheet → (3) installing the post-cast beam reinforcing mesh sheet in place → (4) pouring the concrete in the groove of the post-cast beam 5, and finishing the installation construction of the cover beam.
5. As shown in FIG. 3, the steel bars in the range of the notches of the post-cast beam 5 comprise the steel bars transversely reserved at the top of the post-cast beam and post-cast beam steel bar meshes. The top of the post-cast cross beam is transversely provided with reserved steel bars, and the reserved steel bars comprise left precast beam reserved steel bars 6 and 7 and right precast beam reserved steel bars 8 and 9; the post-cast beam reinforcing mesh sheet comprises closed reinforcing steel bars 10, transverse reinforcing steel bars 11 and vertical reinforcing steel bars 12. The notch of the post-cast beam 5 is of an upper opening open type structure, and an inserted post-cast beam reinforcing mesh is installed.
6. As shown in fig. 4, the top of the post-cast beam is provided with the transverse reserved steel bars 6, 7, 8 and 9 which are arranged in a staggered way on the plane with the post-cast beam mesh reinforcement sheets 10, 11 and 12, and the connection and the anchoring are realized through the staggered lap joint of the steel bars without welding connection.
7. The arrangement of the cross beams and the arrangement of the reinforcing steel bars in the figures 1 to 4 can be adjusted according to the stress requirement of the actual capping beam.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific details set forth herein. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (8)

1. A bent cap structure that the segmentation prefabrication is assembled, this bent cap (1) is located pier column (2) tops, characterized by that, the horizontal section of the bent cap (1) is made up of left precast beam (3), right precast beam (4) and middle post-cast crossbeam (5); the left precast beam (3) and the right precast beam (4) are through long along the length direction of the cover beam (1) and are connected through post-cast cross beams (5) which are distributed at intervals; left side precast beam (3) and right side precast beam (4) reserve the trapezoidal notch of discontinuous in upper portion, assemble the trapezoidal post-cast beam notch structure of constituteing after assembling, post-cast beam notch structure is along bent cap (1) length direction interval arrangement.
2. The precast assembled bent deck structure of claim 1, wherein the post-cast beam notch doubles as a post-cast beam formwork.
3. A segmental precast assembled capping beam construction according to claim 1, wherein the capping beam (1) is installed in place directly on the pier stud (2) without a capping beam temporary support structure.
4. The structure of the sectional precast assembled bent cap as claimed in claim 1, wherein the post-cast beam notch is of an open top structure and is provided with an inserted post-cast beam reinforcing mesh sheet, and a transverse reserved reinforcing bar is arranged at the top of the post-cast beam (5).
5. The precast split bent cap structure as claimed in claim 4, wherein the post-cast beam reinforcing mesh sheets are staggered with the horizontal reserved reinforcing plane at the top of the post-cast beam (5).
6. A segmented precast assembled capping beam construction according to claim 4, wherein the post-cast beam mesh reinforcement comprises closing bars (10), transverse bars (11) and vertical bars (12).
7. The precast split assembled bent cap structure according to claim 4, wherein the transverse reserved steel bars arranged at the top of the post-cast cross beam (5) comprise left precast beam reserved steel bars (6) and (7) and right precast beam reserved steel bars (8) and (9).
8. The precast split bent cap structure according to claim 1, wherein the joints of the bent cap (1) and the pier stud (2) are connected by grouting sleeves or grouting metal corrugated pipes, and the wet joint material is high-performance concrete.
CN202110962816.2A 2021-08-20 2021-08-20 Bent cap structure that segmentation prefabrication was assembled Pending CN113718632A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114960409A (en) * 2022-05-23 2022-08-30 上海市政工程设计研究总院(集团)有限公司 Vertical continuous bridge stand column prefabricated assembly structure and construction method thereof
CN116289521A (en) * 2023-05-12 2023-06-23 湖南省交通规划勘察设计院有限公司 Split prefabricated assembled bridge and construction method thereof
CN116695548A (en) * 2023-08-04 2023-09-05 上海建工二建集团有限公司 Longitudinal split narrow-slit connecting structure of overhead bridge capping beam and construction method

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Publication number Priority date Publication date Assignee Title
CN101845792A (en) * 2009-03-26 2010-09-29 株式会社大宇建设 Method for constructing cast coping part through multi-phase strain
CN102409607A (en) * 2011-09-26 2012-04-11 上海市城市建设设计研究总院 Separately precast and assembled bent cap and construction technology
CN206706546U (en) * 2017-05-10 2017-12-05 上海市城市建设设计研究总院(集团)有限公司 Horizontally-spliced new slab and girder is carried out using UHPC
KR20180057768A (en) * 2016-11-21 2018-05-31 현대건설주식회사 Bonding apparatus and constructuction method of between the precase pier cap and bridge pier for fast construction of connecting set bridge
CN109826090A (en) * 2019-04-01 2019-05-31 上海市城市建设设计研究总院(集团)有限公司 Assembled fragment bent cap and attaching method thereof
CN111576193A (en) * 2020-06-22 2020-08-25 中国铁路设计集团有限公司 Longitudinal assembled prestressed bent cap

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101845792A (en) * 2009-03-26 2010-09-29 株式会社大宇建设 Method for constructing cast coping part through multi-phase strain
CN102409607A (en) * 2011-09-26 2012-04-11 上海市城市建设设计研究总院 Separately precast and assembled bent cap and construction technology
KR20180057768A (en) * 2016-11-21 2018-05-31 현대건설주식회사 Bonding apparatus and constructuction method of between the precase pier cap and bridge pier for fast construction of connecting set bridge
CN206706546U (en) * 2017-05-10 2017-12-05 上海市城市建设设计研究总院(集团)有限公司 Horizontally-spliced new slab and girder is carried out using UHPC
CN109826090A (en) * 2019-04-01 2019-05-31 上海市城市建设设计研究总院(集团)有限公司 Assembled fragment bent cap and attaching method thereof
CN111576193A (en) * 2020-06-22 2020-08-25 中国铁路设计集团有限公司 Longitudinal assembled prestressed bent cap

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114960409A (en) * 2022-05-23 2022-08-30 上海市政工程设计研究总院(集团)有限公司 Vertical continuous bridge stand column prefabricated assembly structure and construction method thereof
CN116289521A (en) * 2023-05-12 2023-06-23 湖南省交通规划勘察设计院有限公司 Split prefabricated assembled bridge and construction method thereof
CN116695548A (en) * 2023-08-04 2023-09-05 上海建工二建集团有限公司 Longitudinal split narrow-slit connecting structure of overhead bridge capping beam and construction method
CN116695548B (en) * 2023-08-04 2023-10-03 上海建工二建集团有限公司 Longitudinal split narrow-slit connecting structure of overhead bridge capping beam and construction method

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