CN103194982B - Construction method for short cantilever support at bridge side span cast-in-situ segment - Google Patents

Construction method for short cantilever support at bridge side span cast-in-situ segment Download PDF

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Publication number
CN103194982B
CN103194982B CN201310096357.XA CN201310096357A CN103194982B CN 103194982 B CN103194982 B CN 103194982B CN 201310096357 A CN201310096357 A CN 201310096357A CN 103194982 B CN103194982 B CN 103194982B
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China
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cantilever support
short cantilever
cast
situ segment
steel
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CN201310096357.XA
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CN103194982A (en
Inventor
李勇
钱江
王俊伟
彭园
侯兆隆
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Road and Bridge International Co Ltd
China Communications Road and Bridge North China Engineering Co Ltd
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Road and Bridge International Co Ltd
China Communications Road and Bridge North China Engineering Co Ltd
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Abstract

The invention relates to a construction method for a short cantilever support at the bridge side span cast-in-situ segment. Two rows of steel plates are embedded on two sides of a cast-in-situ segment box girder of a pier top plane along the bridge direction, the short cantilever support is fabricated in advance and comprises a cross steel beam, longitudinal steel beams perpendicular to the cross steel beam are welded at two ends of the cross steel beam respectively, and diagonal bars are welded between the cross steel beam and the longitudinal steel beams; the longitudinal steel beams of the short cantilever support are welded on an embedded steel plate at the pier top; the cross steel beam of the short cantilever support is suspended outside the pier top plane; rows of bricks are laid on the pier top plane in the horizontal bridge direction at intervals of 70cm; square timbers spanning the bricks are laid on the top surfaces of the bricks in the longitudinal bridge direction at intervals of 70cm; and the short cantilever support, the bricks and the square timbers form a cast-in-situ segment template support system on which follow-up processes of side span cast-in-situ segment construction are performed through the conventional method.

Description

Construction method for short cantilever support at bridge side span cast-in-situ segment
Technical field
The present invention relates to a kind of bridge side span cast-in-situ section construction method, be applied to large-span continuous girder bridges end bay Cast-in-Situ Segment section construction field.
Background technology
Along with the development of bridge Construction Technology, large-span continuous beam Reinforced Concrete Bridge is used widely, and its end bay cast-in-place section construction affects construction quality and the programming of bed rearrangement bridge.At present, end bay cast-in-place section construction method mostly adopts full framing or shelf bracket construction, in work progress, will first set up full framing or shelf bracket, then carry out the operations such as pier top installation form, reinforcing bar binding, prestress pipe installation, concreting.Existing construction method, support or bracket to set up cost relatively high, man-hour is longer, not quick detachable, affects the duration of whole bridge.
Summary of the invention
The object of the invention is to, improve the support in the construction of current bridge side span cast-in-situ section or the structure of bracket, provide a kind of construction method for short cantilever support at bridge side span cast-in-situ segment to reduce costs, the reduction of erection time.
Technical scheme of the present invention is as follows:
A kind of construction method for short cantilever support at bridge side span cast-in-situ segment, is characterized in that:
(1) in the both sides of pier top plane Cast-in-Situ Segment case beam, along bridge to pre-buried two row's steel plates, described pre-embedded steel slab is fixed by dowel and pier top reinforcement welding;
(2) make a kind of short cantilever support in advance, described short cantilever support comprises a gooseneck, at the two ends of described gooseneck, welds a steel longeron vertical with described gooseneck respectively, between described gooseneck and steel longeron, is welded with hound;
(3) utilize tower crane that described short cantilever support entirety is winched to Dun Ding, and by the steel longitudinal beam welding of short cantilever support on the pre-embedded steel slab of Dun Ding; The gooseneck of short cantilever support is suspended from outside the plane of pier top;
(4), in the plane of pier top, between two steel longerons of short cantilever support, direction across bridge lays a row and parallel the laying bricks of short cantilever support gooseneck every 70cm; At described end face of laying bricks, vertical bridge is to laying one every 40cm across the described lumps of wood of laying bricks; Described short cantilever support, to lay bricks and the lumps of wood forms Cast-in-Situ Segment formwork bracing system jointly;
(5) on described Cast-in-Situ Segment formwork bracing system, carry out the subsequent handling of end bay cast-in-place section construction according to a conventional method, comprise the installation of template construction, reinforcing bar binding and prestress pipe, pouring concrete.
Short cantilevered support structure of the present invention is simple, and cost is low, quick for installation, is applied to the construction of end bay Cast-in-Situ Segment, can shorten the construction period to a great extent, increase economic efficiency, and can guarantee that quality control on construction meets the requirement of associated specifications.
Accompanying drawing explanation
Fig. 1 is the arrangement figure of pier top pre-embedded steel slab
Fig. 2 is the structural representation of short cantilever support that the present invention designs and adopts
Fig. 3 is the view after short cantilever support is arranged on Dun Ding
Fig. 4 is the arrangement schematic diagram of laying bricks
Fig. 5 display be the arrangement schematic diagram of the lumps of wood
Fig. 6 is the Cast-in-Situ Segment structural representation after installation form
Detailed description of the invention
Below by way of a specific embodiment, method of the present invention is described in detail.The present embodiment is used for explaining and non-limiting method of the present invention.
Certain two-wire grand bridge structure of main bridge is single box single chamber And of Varying Depth box girder with variable cross section, and curve parameter at the bottom of beam Duan Liang is second-degree parabola, and box section height, by the 5.25m of span centre, is gradient to the 9m of beam root.Case beam establishes the horizontal wall inscription of 2%, the wide 11.56m of case back, bottom width 7m.The cast-in-place segment length 3.75m of end bay, adopts C55 concreting, and about 99.3m measures in total side 3.
End bay Cast-in-Situ Segment adopts method of the present invention, and work progress is as follows:
As shown in Figure 1, in the both sides of pier top 1 Cast-in-Situ Segment case beam, along bridge to pre-buried two row's steel plates 2.In the present embodiment, the steel plate of pre-buried employing 60 × 30cm, the arrangement of steel plate puts 6 pieces for often arranging, and the arrangement pitch of adjacent pre-embedded steel slab is 55cm.Pre-embedded steel slab is fixed by dowel and pier top reinforcement welding.
At the processing space short cantilever support of processing and fabricating in advance, the structure of short cantilever support as shown in Figure 2, comprises a gooseneck 3, at the two ends of described gooseneck 3, weld a steel longeron 4 vertical with described gooseneck respectively, between described gooseneck and steel longeron, be welded with hound 5.
As a kind of embodiment, described gooseneck comprises two i iron arranged side by side, is welded to connect between two i iron arranged side by side by least 3 pieces of junction steel plates 6.Steel longeron described in every root, is made up of two i iron arranged side by side.
In the present embodiment, the gooseneck of short cantilever support adopts the i iron I45a of 2 10.5m, and every root steel longeron adopts 2 length to be the i iron I45a of 3.7m, and two hounds adopt the i iron I28a of 2.6m.
Short cantilever support adds man-hour, and first 2 2I45a section longitudinal beams are welded on gooseneck two ends by design attitude, joint is welded with stiffener, then at the steel longeron I28a long with welding 2.6m between gooseneck as hound, to strengthen the stability of bracket; Again between two i iron of composition gooseneck, be welded with the junction steel plate 6 of 20 × 20cm.After above-mentioned parts are welded into an entirety, namely short cantilever support machines.
After short cantilever support completes, utilize tower crane whole to lift to on-the-spot Dun Ding, and be welded on the pre-embedded steel slab 2 of Dun Ding by the steel longeron 4 of short cantilever support by design attitude, the gooseneck 3 of short cantilever support is suspended from outside the plane of pier top, as shown in Figure 3.
As shown in Figure 4 and Figure 5, in the plane of pier top, between two steel longerons 4 of short cantilever support, direction across bridge lays every 70cm that a row is parallel with gooseneck 3 lays bricks 7, and laying bricks 7 is highly 60cm; Lay bricks 7 end face, vertical bridge to lay every 40cm one across described lay bricks 7 the lumps of wood 8.In the present embodiment, the specification of the lumps of wood 8 is 10 × 10cm.Every root lumps of wood 8 at least lays bricks 7 across two rows.
Described short cantilever support, to lay bricks and the lumps of wood forms Cast-in-Situ Segment formwork bracing system.
On Cast-in-Situ Segment formwork bracing system, carry out the subsequent handling of the end bay cast-in-place section constructions such as the installation of template construction, reinforcing bar binding and prestress pipe, pouring concrete according to a conventional method successively.Described conventional method, as the construction methods such as full framing conventional at present or shelf bracket the installation of template construction, reinforcing bar binding and prestress pipe, the pouring concrete that adopt similar, belong to prior art, do not describe in detail at this, be only summarized as follows:
1, template construction
(1) bed die
Bed die is arranged on Cast-in-Situ Segment formwork bracing system.End bay Cast-in-Situ Segment bed die adopts bamboo slab rubber to add 10 × 10cm lumps of wood back cord and manufactures big-size formwork, and at processing space concentrated processing, tower crane lifting is installed to scene.
(2) internal mold
Internal mold adopts light weight steel frame, and δ=20mm bamboo glue pattern plate makes panel, establishes support in case, steel pipe scaffold spacing 0.6m*0.6m, and step pitch is 1.2m.
(3) external mold
Outer side mold adopts the set shaped steel formwork of 6mm steel facing+8cm channel-section steel back cord+10cm channel-section steel truss, and at processing space concentrated processing, tower crane lifting is installed to scene.
(4) mould is held
Adopt steel form, end mould has reinforcing bar and prestress pipe to stretch out, and status requirement is accurate.
Figure 6 shows that the Cast-in-Situ Segment structural representation after template 9 installation.
2, the installation of reinforcing bar binding and prestress pipe:
(1) colligation of reinforcing bar
Beam body reinforcing bar overall binding in template, first carries out base plate and web reinforcement colligation, then installs internal mold, after internal mold is debugged, carries out the colligation of roof steel bar.
(2) installation of prestress pipe
The prestressing force of end bay Cast-in-Situ Segment comprises longitudinal and transverse, perpendicular three dimension prestressing pipeline, the installation that the installation of pipeline should be applicable in reinforcing bar binding installation process.
3, pouring concrete:
End bay Cast-in-Situ Segment beam body adopts primary concreting, and about 99.3m measures in total side 3.Web concrete is built by horizontal slice, and lift height is no more than 30cm.
4, concrete curing and dabbing:
Form removal when concrete strength reaches design strength more than 50%; After beam section end side form is removed, artificial dabbing concrete surface in time, ensures that exposed parts is fresh coarse aggregate, is beneficial to next sections concrete better bonding.

Claims (6)

1. a construction method for short cantilever support at bridge side span cast-in-situ segment, is characterized in that:
(1) in the both sides of pier top plane Cast-in-Situ Segment case beam, along bridge to pre-buried two row's steel plates, described pre-embedded steel slab is fixed by dowel and pier top reinforcement welding;
(2) make a kind of short cantilever support in advance, described short cantilever support comprises a gooseneck, at the two ends of described gooseneck, welds a steel longeron vertical with described gooseneck respectively, between described gooseneck and steel longeron, is welded with hound;
(3) utilize tower crane that described short cantilever support entirety is winched to Dun Ding, and by the steel longitudinal beam welding of short cantilever support on the pre-embedded steel slab of Dun Ding; The gooseneck of short cantilever support is suspended from outside the plane of pier top;
(4), in the plane of pier top, between two steel longerons of short cantilever support, direction across bridge lays a row and parallel the laying bricks of short cantilever support gooseneck every 70cm; At described end face of laying bricks, vertical bridge is to laying one every 40cm across the described lumps of wood of laying bricks; Described short cantilever support, to lay bricks and the lumps of wood forms Cast-in-Situ Segment formwork bracing system;
(5) on described Cast-in-Situ Segment formwork bracing system, carry out the subsequent handling of end bay cast-in-place section construction according to a conventional method, comprise the installation of template construction, reinforcing bar binding and prestress pipe, pouring concrete.
2. construction method for short cantilever support at bridge side span cast-in-situ segment according to claim 1, is characterized in that: described pre-embedded steel slab adopts the steel plate of 60 × 30cm, and often arrangement puts 6 pieces, and adjacent two block plate spacing are 55cm.
3. construction method for short cantilever support at bridge side span cast-in-situ segment according to claim 1, is characterized in that: described gooseneck comprises two i iron arranged side by side, is welded to connect between described two i iron arranged side by side by least 3 pieces of junction steel plates; Steel longeron described in every root, is made up of two i iron arranged side by side.
4. construction method for short cantilever support at bridge side span cast-in-situ segment according to claim 1, is characterized in that: the height of often laying bricks described in row is 60cm.
5. construction method for short cantilever support at bridge side span cast-in-situ segment according to claim 1, is characterized in that: described in every root, the lumps of wood is at least laid bricks across two rows.
6. construction method for short cantilever support at bridge side span cast-in-situ segment according to claim 1, is characterized in that: described lumps of wood specification is 10 × 10cm..
CN201310096357.XA 2013-03-25 2013-03-25 Construction method for short cantilever support at bridge side span cast-in-situ segment Active CN103194982B (en)

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Publication number Priority date Publication date Assignee Title
CN103669138B (en) * 2014-01-04 2015-07-01 邹中宝 Extrusion rod device for high-pressure hole extruder
CN106087777B (en) * 2016-08-03 2017-10-31 杭州江润科技有限公司 The construction method of high pier long cantilever Cast-in-place Bent Cap combined type formwork system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2632922B2 (en) * 1988-05-16 1997-07-23 大成建設株式会社 Bridge construction method
JP2008240410A (en) * 2007-03-28 2008-10-09 Kawasaki Heavy Ind Ltd Bridge construction method, steel structure, and bridge
CN101469534A (en) * 2007-12-28 2009-07-01 上海市基础工程公司 Pier top load bearing bracket construction technique
CN201567533U (en) * 2009-09-28 2010-09-01 中交二公局第六工程有限公司 Assembly and disassembly-type bracket for cast-in-place of continuous beam
CN202247687U (en) * 2011-09-19 2012-05-30 曹新恒 Universal cast-in-situ trestle for bridge
CN102535339A (en) * 2011-12-07 2012-07-04 中铁十九局集团第七工程有限公司 Bracket for thin-wall hollow high-pier cantilever perfusing continuous beam and constructing method thereof
CN102691266A (en) * 2012-06-03 2012-09-26 中交第四公路工程局有限公司 Construction method for ultrahigh combined support for bridge side span cast-in-situ section

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2632922B2 (en) * 1988-05-16 1997-07-23 大成建設株式会社 Bridge construction method
JP2008240410A (en) * 2007-03-28 2008-10-09 Kawasaki Heavy Ind Ltd Bridge construction method, steel structure, and bridge
CN101469534A (en) * 2007-12-28 2009-07-01 上海市基础工程公司 Pier top load bearing bracket construction technique
CN201567533U (en) * 2009-09-28 2010-09-01 中交二公局第六工程有限公司 Assembly and disassembly-type bracket for cast-in-place of continuous beam
CN202247687U (en) * 2011-09-19 2012-05-30 曹新恒 Universal cast-in-situ trestle for bridge
CN102535339A (en) * 2011-12-07 2012-07-04 中铁十九局集团第七工程有限公司 Bracket for thin-wall hollow high-pier cantilever perfusing continuous beam and constructing method thereof
CN102691266A (en) * 2012-06-03 2012-09-26 中交第四公路工程局有限公司 Construction method for ultrahigh combined support for bridge side span cast-in-situ section

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