CN111663449A - Combined cast-in-place box girder support system and construction method - Google Patents

Combined cast-in-place box girder support system and construction method Download PDF

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Publication number
CN111663449A
CN111663449A CN202010445207.5A CN202010445207A CN111663449A CN 111663449 A CN111663449 A CN 111663449A CN 202010445207 A CN202010445207 A CN 202010445207A CN 111663449 A CN111663449 A CN 111663449A
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CN
China
Prior art keywords
pier
anchor ear
bridge
steel pipe
support
Prior art date
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Pending
Application number
CN202010445207.5A
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Chinese (zh)
Inventor
章从旭
董俭召
刘永松
刘波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Road and Bridge International Co Ltd
Road and Bridge East China Engineering Co Ltd
Original Assignee
Road and Bridge International Co Ltd
Road and Bridge East China Engineering Co Ltd
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Publication date
Application filed by Road and Bridge International Co Ltd, Road and Bridge East China Engineering Co Ltd filed Critical Road and Bridge International Co Ltd
Priority to CN202010445207.5A priority Critical patent/CN111663449A/en
Publication of CN111663449A publication Critical patent/CN111663449A/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
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/04Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete

Abstract

The invention provides a combined cast-in-place box girder support system and a construction method, wherein an upper anchor ear and a lower anchor ear are installed on each middle bridge pier of a bridge, a support rod is arranged between brackets of the upper anchor ear and the lower anchor ear, a steel pipe upright post is respectively arranged near each side pier of the bridge, the bottom of the steel pipe upright post is supported on a ground concrete foundation, bearing cross beams are respectively erected at the upper anchor ear of a transverse bridge and the top of the steel pipe upright post, Bailey longitudinal beams are erected at the tops of two bearing cross beams of each span along the bridge direction, distribution beams are erected on the Bailey longitudinal beams in the transverse bridge direction, full-space supports are installed on the distribution beams, and cast-in-place box girder template systems are installed at the tops of the full-space supports. The invention is suitable for geological conditions of complex terrain conditions, large foundation treatment difficulty, higher pier stud and the like in mountainous areas, and has the advantages of simple structure, less material investment and high safety.

Description

Combined cast-in-place box girder support system and construction method
Technical Field
The invention belongs to the technical field of cast-in-place box girder construction in bridge engineering, and particularly relates to a combined cast-in-place box girder support system and a construction method, which are particularly suitable for cast-in-place box girder construction under the conditions of complex terrain conditions, high foundation treatment difficulty, high pier stud and the like in mountainous areas.
Background
The existing cast-in-place box girder construction support mainly comprises a full-space support and a steel pipe support. The full hall support is high in safety, but is only suitable for areas with no passing requirements below, pier heights within 15m, good foundation conditions and flat terrain; the steel pipe support can be applied as long as the clearance below the bridge can meet the erection requirement, but under the conditions of steep terrain and weak geological conditions, the construction difficulty of the steel pipe stand column foundation is higher, the construction cost is increased, and under the higher condition of the pier column, the steel pipe stand column erection is higher, the work load of high-altitude operation is large, the material investment is large, and the construction risk is high. Under the conditions of complex terrain conditions, high foundation treatment difficulty, high pier stud and the like in mountainous areas, how to ensure the construction safety of the cast-in-place box girder, reduce the cost investment and ensure the construction period is a practical problem faced by construction units.
Disclosure of Invention
The invention aims to provide a combined cast-in-place box girder support system and a construction method which are suitable for the conditions of complex terrain conditions, high foundation treatment difficulty, high pier stud and the like in mountainous areas, and on the premise of ensuring safety, the support structure design is simplified, the temporary material investment is reduced, and the construction period is shortened.
In order to achieve the purpose, the invention provides a combined cast-in-place box girder support system, which is characterized in that: an upper anchor ear and a lower anchor ear are installed on each middle pier of the bridge, a support rod is arranged between brackets of the upper anchor ear and the lower anchor ear, a steel pipe upright is respectively arranged close to each side pier of the bridge, the bottom of the steel pipe upright is supported on a ground concrete foundation, and the elevation of the top of the steel pipe upright is consistent with that of the top of the upper anchor ear; the transverse bridge is to last staple bolt top on the center pier to and set up a bearing crossbeam respectively near the steel pipe stand top of limit pier, set up bailey longeron at every two bearing crossbeam tops of striding in the direction of the bridge the transverse bridge is to setting up an I-steel distributor beam at every certain interval on the bailey longeron, install full hall support on the distributor beam, every montant lower extreme support of full hall support is on the upper flange board of I-steel distributor beam, and cast-in-place box girder formwork system is installed at full hall support top.
The construction method adopting the combined cast-in-place box girder support system is characterized by comprising the following steps:
(1) manufacturing a hoop, a bearing cross beam, a distribution beam and a steel pipe upright post according to the size of the pier; assembling the Bailey longitudinal beams into a whole on the ground, and fixing the reinforcing chord on the lower chord of the Bailey longitudinal beam through a matched bolt;
(2) installing and fixing an upper anchor ear and a lower anchor ear on a mid-span pier stud according to the designed positions by utilizing hoisting equipment, and installing the lower anchor ear and then installing the upper anchor ear;
(3) constructing a concrete expansion foundation on one side of the bottom of the side pier, hoisting the steel pipe upright post on the side pier expansion foundation by utilizing hoisting equipment after the concrete strength meets the standard requirement, and installing corresponding reinforcing structure accessories;
(4) installing a truss type bearing cross beam on an upper hoop of a transverse bridge direction middle pier, installing a support rod between corbels of the upper and lower hoops, and limiting a lower chord of the truss type bearing cross beam between the support rod and the outer wall of the pier body;
(5) hoisting the bailey longitudinal beam on the bearing cross beam of each span along the bridge direction by using hoisting equipment, and installing corresponding reinforcing structural accessories;
(6) laying a profile steel distribution beam on the Bailey longitudinal beam according to the design requirement, and installing corresponding reinforcing structure accessories;
(7) erecting a full-space bracket on the profile steel distribution beam;
(8) erecting a template system on the full-hall bracket according to design requirements;
(9) after the support is pre-pressed to meet the standard requirement, the cast-in-place box girder construction is carried out; when concrete on two sides of the middle pier is poured, the unbalanced weight on the two sides is controlled not to exceed the self bearing capacity of the pier column;
(10) and after the concrete strength of the cast-in-place box girder reaches the standard requirement or the prestress tensioning is finished, the whole support is dismantled.
Compared with the prior art, the invention has the beneficial effects of:
(1) the economic efficiency is as follows: if a steel pipe support or a full-space support is adopted for construction, the steel pipe and section steel materials used for building the single-span support are about 40t, the input labor and mechanical cost is high, and the cost of foundation reinforcement treatment is also increased; and with the increase of the height of the pier, the quantity of the consumed steel and the construction cost are further increased; the single span of the invention mainly needs 8 hoops with the weight of about 2t, thereby saving a large amount of temporary materials and foundation treatment cost.
(2) Construction period: the construction of the steel pipe support or the full support needs the procedures of foundation treatment, steel pipe upright post ground processing, parallel connection high-altitude welding and the like, more components are built, and the construction period is long.
(3) Construction safety and quality: under the conditions of complex terrain conditions, large foundation treatment difficulty, high pier stud and the like in mountainous areas, the steel pipe support or full support is adopted for construction, the foundation treatment difficulty is large, and the quality is difficult to control; the hoisting height is high, the high-altitude operation amount is large, and the safety risk of the mounting and dismounting operation of the bracket is large; the invention has the advantages of simple construction process, easy quality control, low construction difficulty and small safety risk.
Drawings
FIG. 1 is a schematic representation of a forward bridge configuration of an embodiment of the present invention;
FIG. 2 is a schematic view of the transverse bridging structure of the present invention at the middle pier;
fig. 3 is a schematic view of the cross-bridge structure of the present invention at the side pier.
Detailed Description
As shown in fig. 1, 2 and 3, in the combined cast-in-place box girder support system provided by the invention, an upper anchor ear 3 and a lower anchor ear 4 are installed on each midspan pier 1 of a bridge, each anchor ear comprises two semicircular hoop plates, connecting plates are arranged on two sides of each hoop plate, the two hoop plates are buckled on a pier body in an opposite mode, the connecting plates of the two hoop plates are connected through high-strength bolts, the two hoop plates are tightly clasped and fixed with the pier body, and the connecting plates of the two hoop plates are combined into an anchor ear bracket; a support rod 5 is arranged between the brackets of the upper anchor ear 2 and the lower anchor ear 3, and the upper end and the lower end of the support rod 5 are respectively tightly propped against the bottom of the bracket of the upper anchor ear and the top of the bracket of the lower anchor ear; a steel pipe upright post 6 is respectively arranged close to each side pier 2 of the bridge, the bottom of each steel pipe upright post 6 is supported on a ground concrete foundation 7, and the top of each steel pipe upright post is consistent with the top elevation of the upper anchor ear 3; the method is characterized in that a bearing cross beam 8 is respectively erected at the top of an upper anchor ear 3 on a middle pier and the top of a steel pipe upright post 6 close to a side pier along a transverse bridge direction, Bailey longitudinal beams 9 are erected at the top of two bearing cross beams 8 of each span of the bridge along the bridge direction, I-steel distribution beams 10 are erected on the Bailey longitudinal beams 9 along the transverse bridge direction at intervals, the I-steel distribution beams adopt conventional I20a type steel, full space supports 11 are installed on the distribution beams 10, the lower ends of each vertical rod of the full space supports 11 are supported on upper flange plates of the I-steel distribution beams, and cast-in-place box girder template systems 12 are installed at the tops of the full space supports 10.
The full-hall support adopts a bowl buckle or disc buckle structure and is used for adjusting the longitudinal slope and the transverse slope of the support so as to ensure that the linear shape of the beam body meets the requirements.
In specific implementation, the bearing cross beam 7 erected on the upper hoop 3 can adopt a truss type bearing structure, the upper chord member is supported at the top of the upper hoop, the lower chord member is positioned between the connecting rod between the upper hoop and the lower hoop and the outer wall of the pier, and the upper chord member and the lower chord member are welded by inclined struts; the bearing cross beam 7 erected at the top of the steel tube upright 6 can adopt a horizontal bar type bearing beam, and the specification and model of the bearing cross beam are consistent with those of an upper chord of a truss structure bearing beam erected on an upper hoop.
The construction of the box girder is carried out by adopting the combined cast-in-place box girder bracket system, and the concrete method is as follows:
(1) manufacturing a hoop, a bearing cross beam, a distribution beam and a steel pipe upright post according to the size of the pier; assembling the Bailey longitudinal beams into a whole on the ground, and fixing the reinforcing chord on the lower chord of the Bailey longitudinal beam through a matched bolt;
(2) installing and fixing an upper anchor ear and a lower anchor ear on a mid-span pier stud according to the designed positions by utilizing hoisting equipment, and installing the lower anchor ear and then installing the upper anchor ear;
(3) constructing a concrete expansion foundation on one side of the bottom of the side pier, hoisting the steel pipe upright post on the side pier expansion foundation by utilizing hoisting equipment after the concrete strength meets the standard requirement, and installing corresponding reinforcing structure accessories;
(4) installing a truss type bearing cross beam on an upper hoop of a transverse bridge direction middle pier, installing a support rod between corbels of the upper and lower hoops, and limiting a lower chord of the truss type bearing cross beam between the support rod and the outer wall of the pier body;
(5) hoisting the bailey longitudinal beam on the bearing cross beam of each span along the bridge direction by using hoisting equipment, and installing corresponding reinforcing structural accessories;
(6) laying a profile steel distribution beam on the Bailey longitudinal beam according to the design requirement, and installing corresponding reinforcing structure accessories;
(7) erecting a full-space bracket on the profile steel distribution beam;
(8) erecting a template system on the full-hall bracket according to design requirements;
(9) after the support is pre-pressed to meet the standard requirement, the cast-in-place box girder construction is carried out; when concrete on two sides of the middle pier is poured, the unbalanced weight on the two sides is controlled not to exceed the self bearing capacity of the pier column;
(10) and after the concrete strength of the cast-in-place box girder reaches the standard requirement or the prestress tensioning is finished, the whole support is dismantled.

Claims (3)

1. The utility model provides a modular cast-in-place box girder braced system which characterized in that: an upper anchor ear and a lower anchor ear are installed on each middle pier of the bridge, a support rod is arranged between brackets of the upper anchor ear and the lower anchor ear, a steel pipe upright is respectively arranged close to each side pier of the bridge, the bottom of the steel pipe upright is supported on a ground concrete foundation, and the elevation of the top of the steel pipe upright is consistent with that of the top of the upper anchor ear; the transverse bridge is to last staple bolt top on the center pier to and set up a bearing crossbeam respectively near the steel pipe stand top of limit pier, set up bailey longeron at every two bearing crossbeam tops of striding in the direction of the bridge the transverse bridge is to setting up an I-steel distributor beam at every certain interval on the bailey longeron, install full hall support on the distributor beam, every montant lower extreme support of full hall support is on the upper flange board of I-steel distributor beam, and cast-in-place box girder formwork system is installed at full hall support top.
2. The modular cast-in-place box beam support system of claim 1, wherein: the bearing cross beam erected on the upper hoop is of a truss structure, the upper chord member of the bearing cross beam is supported at the top of the upper hoop, the lower chord member of the bearing cross beam is positioned between the support rod between the upper hoop and the lower hoop and the outer wall of the pier, and the upper chord member and the lower chord member are welded by inclined struts; the bearing cross beam erected at the top of the steel tube stand column is of a single-rod structure, and the specification and model of the bearing cross beam are consistent with those of the upper chord of the truss type bearing beam erected on the upper hoop.
3. A method of construction using the modular cast-in-place box beam support system of claim 1, comprising the steps of:
(1) manufacturing a hoop, a bearing cross beam, a distribution beam and a steel pipe upright post according to the size of the pier; assembling the Bailey longitudinal beams into a whole on the ground, and fixing the reinforcing chord on the lower chord of the Bailey longitudinal beam through a matched bolt;
(2) installing and fixing an upper anchor ear and a lower anchor ear on a mid-span pier stud according to the designed positions by utilizing hoisting equipment, and installing the lower anchor ear and then installing the upper anchor ear;
(3) constructing a concrete expansion foundation on one side of the bottom of the side pier, hoisting the steel pipe upright post on the side pier expansion foundation by utilizing hoisting equipment after the concrete strength meets the standard requirement, and installing corresponding reinforcing structure accessories;
(4) installing a truss type bearing cross beam on an upper hoop of a transverse bridge direction middle pier, installing a support rod between corbels of the upper and lower hoops, and limiting a lower chord of the truss type bearing cross beam between the support rod and the outer wall of the pier body;
(5) hoisting the bailey longitudinal beam on the bearing cross beam of each span along the bridge direction by using hoisting equipment, and installing corresponding reinforcing structural accessories;
(6) laying a profile steel distribution beam on the Bailey longitudinal beam according to the design requirement, and installing corresponding reinforcing structure accessories;
(7) erecting a full-space bracket on the profile steel distribution beam;
(8) erecting a template system on the full-hall bracket according to design requirements;
(9) after the support is pre-pressed to meet the standard requirement, the cast-in-place box girder construction is carried out; when concrete on two sides of the middle pier is poured, the unbalanced weight on the two sides is controlled not to exceed the self bearing capacity of the pier column;
(10) and after the concrete strength of the cast-in-place box girder reaches the standard requirement or the prestress tensioning is finished, the whole support is dismantled.
CN202010445207.5A 2020-05-23 2020-05-23 Combined cast-in-place box girder support system and construction method Pending CN111663449A (en)

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Application Number Priority Date Filing Date Title
CN202010445207.5A CN111663449A (en) 2020-05-23 2020-05-23 Combined cast-in-place box girder support system and construction method

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Application Number Priority Date Filing Date Title
CN202010445207.5A CN111663449A (en) 2020-05-23 2020-05-23 Combined cast-in-place box girder support system and construction method

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CN111663449A true CN111663449A (en) 2020-09-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112411386A (en) * 2020-11-26 2021-02-26 中铁三局集团有限公司 Method for erecting and dismantling continuous beam No. 0 block reinforced concrete-filled steel tube support
CN112900273A (en) * 2021-01-20 2021-06-04 浙江交工集团股份有限公司 Non-contact platform for erecting cast-in-place beam support on separated old bridge and construction method thereof
CN113957795A (en) * 2021-09-18 2022-01-21 中铁大桥局集团有限公司 Method and system for manufacturing beam by using large-span beam type support

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112411386A (en) * 2020-11-26 2021-02-26 中铁三局集团有限公司 Method for erecting and dismantling continuous beam No. 0 block reinforced concrete-filled steel tube support
CN112900273A (en) * 2021-01-20 2021-06-04 浙江交工集团股份有限公司 Non-contact platform for erecting cast-in-place beam support on separated old bridge and construction method thereof
CN112900273B (en) * 2021-01-20 2022-06-10 浙江交工集团股份有限公司 Non-contact platform for erecting cast-in-place beam support on separated old bridge and construction method thereof
CN113957795A (en) * 2021-09-18 2022-01-21 中铁大桥局集团有限公司 Method and system for manufacturing beam by using large-span beam type support

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