CN107401121B - A kind of beam prefabricated cast-in-place design and construction method of U - Google Patents

A kind of beam prefabricated cast-in-place design and construction method of U Download PDF

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Publication number
CN107401121B
CN107401121B CN201710604936.9A CN201710604936A CN107401121B CN 107401121 B CN107401121 B CN 107401121B CN 201710604936 A CN201710604936 A CN 201710604936A CN 107401121 B CN107401121 B CN 107401121B
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vertical web
construction
web part
inner support
hanger
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CN107401121A (en
Inventor
李文俊
吴立柱
易黎明
李亚
宋克坤
张波
裴国强
陈为民
章金飞
邵明
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CCCC Second Harbor Engineering Co
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CCCC Second Harbor Engineering Co
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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
    • 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
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed

Abstract

The invention discloses a kind of beam prefabricated cast-in-place design and construction methods of U, and U beam entirety is divided into vertical web part and horizonal base plate part along its cross-sectional design;Pouring in, after bottom prestressing tendon tensioning and sealing off and covering anchorage for vertical web part to be done, vertical web part is lifted to bridge pier top and keeps it longitudinally fixed along bridge;Recycle the cast in situs that hanger and bed die completion horizonal base plate part are set based on vertical web part on bridge pier;Finally complete sealing off and covering anchorage after the tensioning of the top longitudinal prestressing steel beam and bottom plate lateral prestressing tendon of vertical web.The present invention efficiently solves the problems such as traffic under bridge can not be closed, Clearance requirement is high, the construction time is nervous, while ensure that construction quality, has further saving than former traditional design construction method in terms of working measure;Short construction period, construction time are few.

Description

A kind of beam prefabricated cast-in-place design and construction method of U
Technical field
The present invention relates to a kind of U beams to pour design and construction method, belongs to traffic engineering bridge technology field, and in particular to one Kind is for the beam prefabricated cast-in-place design and construction of situation U that traffic can not be closed, Clearance requirement of constructing is higher, the construction period is nervous under bridge Method.
Background technique
In the prior art some bridges, in construction of railways multiple line project, there is part freely-supported post-tensioned prestressing U beam bridge deck-molding 2.6m, wide 6.8m, span 25m, weight 350t, across highway, traditional design is disposable cast-in-place molding, and traditional construction is using full Hall bracket or steel pipe limited bracket method carry out disposable cast-in-place construction.But this design and construction method can suitable for construction under bridge Closing or partially enclosed traffic, under-clearance be of less demanding, the construction period requires the case where taking it easy, but for traffic under bridge It can not close, the situation that Clearance requirement of constructing is higher, the construction period is nervous, traditional design and construction method will show phase The shortcomings that answering;Simultaneously because both wired linear absolute altitude of original is lower, multiple line design need to keep almost the same with both wired absolute altitudes, thus Cause construction Clearance requirement under bridge very high.Since U beam is heavier, according to disposable prefabrication and lifting, large tonnage crane need to be used, and It is limited by transport routes and traffic control, Technological Economy sexual valence ratio is not high.
The novel beam prefabricated cast-in-place combination design and construction method of U is reasonably divided into web using by the progress of U beam cross section With two parts of bottom plate, web and floor structure are designed, and web is carried out at the scene prefabricated, is reached to concrete strength It to after requirement, is lifted using conventional cranes, hanger then is set using web, bottom plate cast-in-place construction is carried out, thus effectively The problems such as traffic is not closed, and construction Clearance requirement is high, and the construction period is nervous, and economy is reasonable, is solved under bridge.
Summary of the invention
In view of the above-mentioned drawbacks of the prior art, the purpose of the present invention is to solve the deficiency of the above background technology, A kind of beam prefabricated cast-in-place design and construction method of U is provided, which overcome the volume of traffic below beam greatly, traffic control is more difficult, work progress In can not blocked road, bridge construction the method that U beam under operating conditions constructs such as be pressed for time.
In order to solve the above technical problems, present invention employs the beam prefabricated cast-in-place design and construction methods of such a U, by U beam It is whole to be divided into vertical web part and horizonal base plate part along its cross-sectional design;Vertical web part to be done pour and In, after bottom prestressing tendon tensioning and sealing off and covering anchorage, vertical web part is lifted to above bridge pier and keeping it longitudinally fixed along bridge; Recycle the cast in situs that hanger and bed die completion horizonal base plate part are set based on vertical web part on bridge pier;It is last complete At sealing off and covering anchorage after the tensioning of the top longitudinal prestressing steel beam and bottom plate lateral prestressing tendon of vertical web.(vertical web portion exists Fixed form on bridge pier is consistent with the fixed form of common U beam;The tensioning of every longitudinal prestressing steel beam in vertical web portion Method is consistent with the method for stretching of longitudinal prestressing steel beam in common U beam, and difference is every longitudinal direction in vertical web portion Prestressed strand is not simultaneous tension, but there are a sequencings, this is also one of core of the invention inventive point;And Vertical web part can construct in cast in situs under bridge or shift to an earlier date in processing factory after processing is completed by means of transport Lifting is completed under transport to construction bridges)
In a kind of preferred embodiment of the invention, by U beam it is whole along its cross-sectional design be divided into two it is vertical right Claim the I shape web part arranged and a horizontally disposed bottom parts;It is pre- that multiple longitudinal directions are provided on each I shape web part Stress steel beam.(the connection reinforcing bar of I shape web part being horizontally arranged with for connecting bottom board part, so that bottom parts pour With can be linked to be a whole U-shaped beam with I shape web part)
In a kind of preferred embodiment of the invention, the construction procedure of vertical web part: in the construction site under bridge Or processing factory arranges precast pedestal, the vertical web part of cast in situs on precast pedestal, the coagulation to vertical web part After soil meets tensioning intensity requirement, step by step on vertical web part longitudinal prestressing steel Shu Jinhang tensioning and sealing off and covering anchorage;Then Complete the lifting construction of vertical web part.
In a kind of preferred embodiment of the invention, longitudinal prestressing steel Shu Zhangla step: except being connected to vertical web Other than first longitudinal prestressing steel beam at top, from top to bottom successively tensioning is connected to remaining longitudinal direction on vertical web part Prestressed strand.
In a kind of preferred embodiment of the invention, after the construction for completing vertical web part, vertical web portion is completed After the construction divided, lateral inner support (i.e. two parallel vertical webs are installed in longitudinal both ends end point of vertical web part Lateral inner support has been built in partial longitudinal both ends end point, to surround a rectangular-shape, increases integrally-built Rigidity).
In a kind of preferred embodiment of the invention, lateral inner support in lateral inner support upper beam, transverse direction including propping up Support lower beam and lateral inner support diagonal brace;The top that the vertical web part is fixed in inner support upper beam, it is described Lateral inner support lower beam is fixed in the bottom of the vertical web part, in the transverse direction inner support upper beam and the transverse direction The lateral inner support diagonal brace is connected between support lower beam.
In a kind of preferred embodiment of the invention, the construction procedure of horizonal base plate part includes: to be equipped with transverse direction The hanger set up at the top of the vertical web part of inner support, and be arranged in the hanger bottom for pouring horizonal base plate part Bottom die completes the pouring construction of horizonal base plate part;After underplate concrete intensity meets tensioning requirement, successively tensioning connects After being connected to first longitudinal prestressing steel beam and bottom plate lateral prestressing tendon at the top of vertical web, sealing off and covering anchorage is simultaneously removed in transverse direction Support, hanger and bottom die.
In a kind of preferred embodiment of the invention, the hanger includes fining twisted steel, hanger upper beam and hanger Lower beam;The hanger upper beam is fixed in vertical web part top, and the hanger lower beam passes through the fining twisted steel It is suspended to below the hanger upper beam, is equipped with the bottom die on the hanger lower beam.
In a kind of preferred embodiment of the invention, specific steps include: step 1: designing and draw in U beam cross section Point, U beam entirety is divided into vertical web part and horizonal base plate part along its cross-sectional design, so that in the construction process, Vertical web part is able to bear the construction loads of horizonal base plate partial response;The installation of the vertical web part of U beam, according to The vertical web part of on-site actual situations cast in situs on precast pedestal meets tensioning to vertical web part concrete strength After it is required that, from top to bottom successively remaining institute of tensioning in addition to first longitudinal prestressing steel beam being connected at the top of vertical web There is longitudinal prestressing steel beam;Step 3: lateral inner support installation finishes longitudinal both ends end of vertical web part in construction Lateral inner support is installed at head;Step 4: the installation of U beam horizonal base plate part is being equipped with the vertical of lateral inner support The hanger with bottom die is built on web part, completes after the pouring construction of bottom die that successively tensioning is connected to vertical abdomen After first longitudinal prestressing steel beam and bottom plate lateral prestressing tendon at the top of plate and sealing off and covering anchorage step 5: removing branch in laterally Support, hanger and bottom die, the construction of U beam finish.
The beneficial effects of the present invention are: the present invention is by being divided into three parts two along its cross-sectional design to U beam is whole The I shape web part of symmetrical parallel arrangement and a horizontally disposed bottom parts simultaneously propose the section construction elder generation of U girder construction Construction I shape web part, bottom parts of constructing afterwards, to realize, the heavy traffic under bridge, Clearance requirement is high, the construction time is tight The construction of U beam is fast and efficiently realized under the operating condition in the area opened;The present invention is designed by gradation stretch-draw prestressing force simultaneously, I shape web part beam body antiarch has been efficiently controlled, and the construction loads in bottom plate cast-in-place stage can be born;In order to prevent I shape web part is laterally toppled over, and lateral inner support is arranged in the present invention between two panels web, becomes rock-steady structure.This hair It is bright to efficiently solve the problems such as traffic under bridge be closed, Clearance requirement is high, the construction time is nervous, quality aspect, due to web Part carries out prefabricated construction, is more advantageous to the guarantee of construction quality in this way;In terms of working measure, due to only setting hanger, without setting Full hall scaffold or few steel pipe support are set, without precompressed, is had than former traditional design construction method into one in terms of working measure Step is saved;In terms of construction period, due to not having to setting bracket, while prepressing procedures are saved, the live bottom plate cast-in-place activity duration is short, Construction time is saved many than former traditional design construction method.
Detailed description of the invention
Fig. 1 is the beam prefabricated cast-in-place combination cross section division figure of novel U;
Fig. 2 is novel U web and baseboard prestress figure (skiagraph);
Fig. 3 is novel U web and baseboard prestress steel beam position schematic diagram;
Fig. 4 is lateral inner support figure between novel U web;
Fig. 5 is novel U beam transverse direction hanger figure;
Fig. 6 is the beam prefabricated cast-in-place combination design and construction method flow diagram of novel U;
In figure: 1.U web part;2.U beam bottom parts;3. longitudinal prestressing top beam;4. beam in longitudinal prestressing;5. Longitudinal prestressing bottom beam;6. bottom plate transverse prestress;7. lateral inner support upper beam;8. lateral inner support lower beam;9. laterally Inner support diagonal brace;10. fining twisted steel;11. hanger upper beam;12. hanger lower beam;13. bottom die.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not For limiting the present invention.
The technical solution adopted by the present invention to solve the technical problems is: traditional U girder construction closes cross section Reason divides, and is divided into two parts of web (i.e. vertical web part) and bottom plate (i.e. horizonal base plate part), carries out respectively to it Design.Web is designed, the web after division is " I " type girder construction, and single web longitudinally there are 3 beam prestress wire (roots According to needs, >=3 beam prestress wires also can be used), if by former design idea, 3 beam prestressing force need disposable tensioning to use To bear beam body load and mobile load, but now due to web self weight only entire beam body weight 1/3, need to consider that gradation tensioning is answered in advance Power design, i.e., in prefabricated subsection only tensioning bottom beam and middle beam, top beam tensioning again after the completion of bottom plate is cast-in-place, so that it is anti-to control beam body Arch, and the construction loads in bottom plate cast-in-place stage can be born;For back-plane design, bottom plate has transverse prestress, in design process The middle connection considered between bellows and I beam anchorage, and for I beam and contacts baseplate position, dabbing processing need to be carried out, is improved New-old concrete face bonding strength and shear resistance.Work progress, first web is carried out at the scene it is prefabricated, it is full to concrete strength After foot requires, web installation is carried out using crane, web is laterally toppled in order to prevent, and branch in laterally is arranged between two panels web Support, becomes rock-steady structure.Using two panels web, hanger and bed die are set, so that U beam bottom plate cast-in-place construction is carried out, to mixed After solidifying soil intensity is met the requirements, then the tensioning of web top beam and bottom plate transverse prestress, sealing off and covering anchorage construction are successively carried out, finally removed Hanger and bed die.Such beam prefabricated cast-in-place combination design and construction method of novel U, efficiently solve traffic under bridge can not close, The problems such as Clearance requirement is high, the construction time is nervous, quality aspect are more advantageous in this way since web part carries out prefabricated construction The guarantee of construction quality;In terms of working measure, due to only setting hanger, do not have to setting full hall scaffold or few steel pipe support, also without Precompressed is needed, has further saving than former traditional design construction method in terms of working measure;In terms of construction period, due to not having to set Bracket is set, while saving prepressing procedures, the live bottom plate cast-in-place activity duration is short, and the construction time is than former traditional design construction method section It saves many.
In a kind of specific embodiment disclosed in this specification attached drawing, Specific construction step includes:
1, U beam section is divided and is designed
It is analyzed according to calculating, U beam is rationally divided into 2 parts, i.e. U web part 1, U beam bottom parts 2.So that In the construction process, U web part 1 is able to bear the corresponding construction loads of U beam bottom parts 2, while considering constructing Cheng Zhong designs the longitudinal prestressing of U web part 1 according to tensioning in batches to avoid antiarch amount excessive.(at this point, U beam The interface of web part 1 and U beam bottom parts 2 can be according to Operating condition adjustment, while only needing to adjust U web accordingly The number of longitudinal prestressing steel beam on part 1 meets operating condition)
2, U web partial precast is constructed
According to on-site actual situations, suitable position is selected, arranges precast pedestal, 1 in-situ precast of U web part is carried out and applies Work after 1 concrete strength meets tensioning requirement after U web part, successively carries out beam 4 and longitudinal prestressing in longitudinal prestressing The tensioning of bottom beam 5 and sealing off and covering anchorage.
3, U web part lifting construction
After 1 concrete strength meets design requirement after U web part, suspension centre is set at beam both ends, is carried out using crane Beam body lifting construction.
4, lateral inner support installation between two web of U beam
Since 1 depth-width ratio of U web part is larger, to prevent from toppling, two panels U web part 1 after the installation is completed, stand Lateral inner support installation is carried out in beam both ends (longitudinal direction).Lateral inner support is by lateral inner support upper beam 7, lateral interior branch It supports lower beam 8 and lateral inner support diagonal brace 9 forms.
5, U beam construction of bottom plates
Hanger is set up using two panels U web part 1, hanger is by under fining twisted steel 10, hanger upper beam 11 and hanger Crossbeam 12 forms, and bottom die 13 is laid with above hanger lower beam 12.Carry out base plate steel bar binding, prestressing force bellows buries If constructing with concrete cast-in-situ.(overall structure is that longitudinal both ends of U web part 1 are equipped with lateral inner support, U web The longitudinal middle part interval of part 1 is equipped with multiple hangers)
6, U beam longitudinal prestressing top beam and the construction of bottom plate transverse prestress
After underplate concrete intensity meets tensioning requirement, successively carries out U beam longitudinal prestressing top beam 3 and bottom plate is laterally pre- 6 tensioning of stress and sealing off and covering anchorage construction, finally remove hanger and bottom die 13.
The novel beam prefabricated cast-in-place combination design and construction method flow schematic diagram of U is shown in Fig. 5.
More than it should be understood that, only a specific embodiment of the invention, but protection scope of the present invention is not limited to In this, anyone skilled in the art within the technical scope disclosed by the invention, the variation that can readily occur in or is replaced It changes, should be covered by the protection scope of the present invention.
Under the conditions of traffic can not be closed under bridge, Clearance requirement of constructing is higher, the construction period is nervous with " traditional U girder construction Design and construction method " compare

Claims (9)

1. a kind of beam prefabricated cast-in-place design and construction method of U, it is characterised in that: be integrally divided into U beam along its cross-sectional design perpendicular Straight web part and horizonal base plate part;Vertical web part to be done pour and in, bottom prestressing tendon tensioning and sealing off and covering anchorage Afterwards, vertical web part is lifted to bridge pier top and keeps it longitudinally fixed along bridge;Recycle vertical web part on bridge pier Based on the cast in situs that hanger and bed die complete horizonal base plate part is set;It longitudinally answers in advance at the top for finally completing vertical web Sealing off and covering anchorage after the tensioning of power steel beam and bottom plate lateral prestressing tendon.
2. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 1, it is characterised in that: U beam is whole along it Cross-sectional design be divided into two vertically symmetrical arrangements I shape web part and a horizontally disposed bottom parts;Each I shape Multiple longitudinal prestressing steel beams are provided on web part.
3. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 1, it is characterised in that: vertical web part Construction procedure: arrange precast pedestal in construction site or processing factory under bridge, the vertical abdomen of cast in situs on precast pedestal Plate part, after the concrete of vertical web part meets tensioning intensity requirement, step by step to longitudinal pre- on vertical web part Stress steel Shu Jinhang tensioning and sealing off and covering anchorage;Then the lifting construction of vertical web part is completed.
4. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 3, it is characterised in that: longitudinal prestressing steel Shu Zhangla step: in addition to first longitudinal prestressing steel beam being connected at the top of vertical web, from top to bottom successively tensioning connects Remaining the longitudinal prestressing steel beam being connected on vertical web part.
5. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 1, it is characterised in that: complete vertical web After partial construction, lateral inner support is installed at longitudinal both ends of vertical web part.
6. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 5, it is characterised in that: lateral inner support packet Include lateral inner support upper beam, lateral inner support lower beam and lateral inner support diagonal brace;The transverse direction inner support upper beam is affixed In the top of the vertical web part, the transverse direction inner support lower beam is fixed in the bottom of the vertical web part, institute It states and is connected with the lateral inner support diagonal brace between lateral inner support upper beam and the lateral inner support lower beam.
7. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 1, it is characterised in that: horizonal base plate part Construction procedure include: the hanger set up at the top of the vertical web part for being equipped with lateral inner support, and at the hanger bottom The bottom die for pouring horizonal base plate part is arranged in portion, completes the pouring construction of horizonal base plate part;To underplate concrete After intensity meets tensioning requirement, successively tensioning is connected to first longitudinal prestressing steel beam and bottom plate transverse direction at the top of vertical web After prestressed strand, sealing off and covering anchorage simultaneously removes lateral inner support, hanger and bottom die.
8. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 7, it is characterised in that: the hanger includes Fining twisted steel, hanger upper beam and hanger lower beam;The hanger upper beam is fixed in vertical web part top, described to hang Frame lower beam is suspended to below the hanger upper beam by the fining twisted steel, is equipped on the hanger lower beam described Bottom die.
9. a kind of beam prefabricated cast-in-place design and construction method of U according to claim 1, it is characterised in that: its Specific construction step Suddenly include:
Step 1: U beam entirety is divided into vertical web part and water along its cross-sectional design by the design of U beam cross section and division Flat underside part, so that in the construction process, vertical web part is able to bear the construction loads of horizonal base plate partial response;
Step 2: the installation of the vertical web part of U beam, according to on-site actual situations, cast in situs is vertical on precast pedestal Web part, after vertical web part concrete strength meets tensioning requirement, from top to bottom successively tensioning is vertical except being connected to Remaining all longitudinal prestressing steel beam other than first longitudinal prestressing steel beam at the top of web;
Step 3: lateral inner support installation is installed in longitudinal both ends end point that lifting construction finishes vertical web part Lateral inner support;
Step 4: the installation of U beam horizonal base plate part builds band on the vertical web part for being equipped with lateral inner support Have the hanger of bottom die, complete after the pouring construction of bottom die first that successively tensioning is connected at the top of vertical web it is vertical After to prestressed strand and bottom plate lateral prestressing tendon and sealing off and covering anchorage;
Step 5: removing lateral inner support, hanger and bottom die, and the construction of U beam finishes.
CN201710604936.9A 2017-07-24 2017-07-24 A kind of beam prefabricated cast-in-place design and construction method of U Active CN107401121B (en)

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CN109914244B (en) * 2019-04-26 2023-12-05 四川路桥华东建设有限责任公司 Weak bracket system suitable for high-tower reinforced concrete combined beam steel structure installation and bottom and top plate concrete pouring and operation method thereof
CN111335166A (en) * 2020-03-09 2020-06-26 浙江交工集团股份有限公司 Construction method using self-bearing structure as temporary support
CN113605246A (en) * 2021-08-24 2021-11-05 湖南大学 Prestressed UHPC shell-concrete inner core combined bent cap structure and construction method thereof

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