CN109797660A - A kind of segment bracket construction method of beam bridge - Google Patents
A kind of segment bracket construction method of beam bridge Download PDFInfo
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- CN109797660A CN109797660A CN201910219495.XA CN201910219495A CN109797660A CN 109797660 A CN109797660 A CN 109797660A CN 201910219495 A CN201910219495 A CN 201910219495A CN 109797660 A CN109797660 A CN 109797660A
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Abstract
The invention discloses a kind of segment bracket construction methods of beam bridge, comprising the following steps: the first step, ground hardening processing；Second step, each across the whole brackets of interior arrangement, and carry out pre-pressing bracket processing；Third step, evenly in bridge pier two sides, section completes installation template, reinforcing bar etc., casting concrete section by section, and stretch-draw prestressing force steel strand wires remove bracket below after tensioning is completed in each segment；When 4th step, construction reach maximum cantilever, end bay Cast-in-Situ Segment of constructing；5th step, installs end bay closure section stiff skeleton, and end bay closure removes end bay closure section bracket；6th step cancels the temporary consolidation of pier, beam, installs midspan closing section stiff skeleton, and midspan closing removes midspan closing section bracket；7th step, tensioning externally cable, bridge floor of mating formation etc..The present invention has easy to operate, construction safety, high efficient construction, can be widely applied to the construction method technical field of squat pier beam bridge.
Description
Technical field
The present invention relates to method for bridge construction technical fields.It is more particularly related to a kind of segment branch of beam bridge
Frame construction method.
Background technique
In bridge construction, beam bridge using very extensive.And as science and technology develops rapidly, construction technology
It is improved constantly, therefore the across footpath of beam bridge is also increasing.Construction for Large span girder bridge, the construction method being currently known
Mainly there are cast-in-place cantilever method, mobile Support Method, segmental precast erection method etc..
Cast-in-place cantilever method is the method symmetrically constructed paragraph by paragraph along span of bridge direction on built bridge pier.Cantilever pours
Building is to reach certain intensity post-stress beam to concrete in the symmetrical concrete in situ paragraph by paragraph in bridge pier two sides,
Mobile equipment template continues cantilever construction.The disadvantage is that cradle structure is complicated, construction requirement is high, cantilever face sky construction safety degree compared with
Small, each construction segmental length is limited, and the construction period is long, and progress is slow, and project cost is higher.
Mobile Support Method is to use the bracket that can be vertically moved on bridge pier and template, on it splicing span by span coagulating cement
Native prefabrication of beam part or in-situ cement concrete, and apply prestressed construction method by cross.The disadvantage is that the span of control is big, deposit
More, the complicated organization in process, the allotment of resource difficulty, safe mass control task are arduous.
Segmental precast erection method is that bridge plate is decomposed into cell cube to make in factory or precasting yard, then will constitute bridge plate
Cell cube is transported at bridge place and is mounted on bridge pier.The disadvantage is that constituting the binding site construction fiber crops of the cell cube of bridge plate
Tired, the bonding strength for constituting the interconnecting piece between the cell cube of bridge plate is poor, leaves hidden danger, and construction equipment requires height, prefabricated bridge plate
Required place is big when cell cube.
To sum up, existing method for bridge construction cannot meet simultaneously: construction is simple, safe and reliable, save the cost, construct into
Spend fast requirement.
The present invention proposes a kind of segment bracket construction method of beam bridge, has easy to operate, construction safety, construction efficiency high
The advantages that, it can be widely applied to the construction method technical field of squat pier beam bridge.
Summary of the invention
Technical problem: the object of the present invention is to provide one kind be suitable for squat pier beam bridge, have easy to operate, construction safety,
The segment bracket construction method of high efficient construction.
Technical solution: in order to realize object of the present invention and further advantage, a kind of segment bracket of beam bridge is provided
Construction method, comprising the following steps: the first step, ground hardening processing；Second step, each across the whole brackets of interior arrangement, go forward side by side
The processing of row pre-pressing bracket；Third step, evenly in bridge pier two sides, section completes installation template, reinforcing bar etc. section by section, and casting concrete is opened
Prestress wire is drawn, after tensioning is completed in each segment, removes bracket below；4th step, construction reach maximum cantilever
When, end bay Cast-in-Situ Segment of constructing；5th step, installs end bay closure section stiff skeleton, and end bay closure removes end bay closure section bracket；
6th step cancels the temporary consolidation of pier, beam, installs midspan closing section stiff skeleton, and midspan closing removes midspan closing section branch
Frame；7th step, tensioning externally cable, bridge floor of mating formation.
Preferably, first step ground hardening handles the bearing capacity for reinforcing ground, it is made to be enough to bear bracket transmitting
The gravity load of superstructure, treating method include cushion, preloading method, heavy-tamping method, vibroflotation, Sand Pile Method, lime pile
Method, column hammer develop a method, native compaction pile method, Deep Mixing Method, jet grouting, single liquid law of planning, soda solution grouting etc., make
Foundation capability improves, and differential settlement amount is reduced, and frost heave is reduced, and improves the stability of bracket and superstructure.
Preferably, strength and stability checking computations are carried out to bracket before second step each whole brackets across interior arrangement, calculated
As a result it should meet code requirement, fully consider the influence of longitudinal slope and camber, after bracket is installed, carry out at pre-pressing bracket
Reason, eliminates its inelastic deformation, and observe its flexible deformation, provides foundation for mould absolute altitude.Bracket, which should have, easy drops dress
It sets, and can guarantee in prestressed strand tensioning, construction segment and below horizontal direction energy Free Transform between bracket to the greatest extent may be used
The frictional resistance between bracket and beam body can be reduced.
Preferably, third step Piecemeal erection template, reinforcing bar are carried out on the bracket below the segment that will be constructed, after installation
Mould absolute altitude is verified, carries out concreting and prestressed stretch-draw later.
Preferably, after tensioning is completed in each segment, the bracket and template of the segment are first made with the lowering device of bracket
It disengages, completes the conversion of stress system, then remove the bracket below the segment.
Preferably due to which all brackets have all been installed in advance, therefore the mould for segment of not constructing can also be installed in advance
Plate and reinforcing bar, construction speed arrange flexibly controllable.
The utility model has the advantages that the construction method each across the whole brackets of interior arrangement, construct and rely on fixed construction with bracket
Platform makes in subsequent construction, material, the carrying of tool and the action of worker it is all more convenient with it is safe, avoid mobile branch
Inconvenience and danger in frame method and Cantilever Construction Method.
In the construction method, the gravity load of the segment in construction be transmitted to by bracket have enough bearing capacities and
The ground of stability, rather than the segment for completion of having constructed is passed to, therefore segmental length can suitably increase, construction procedure subtracts
It is few, so that construction efficiency can be improved, accelerate construction progress.
In the construction method, after each striking, superfluous constraint is released, the statically determinate structure of the rigid structure of T-type is formed, mentions
The high safety of work progress.
The construction method avoids the equipment and equipment using some structure or operation complexity, enormously simplifies project amount,
Difficulty of construction is reduced, safety is also easy to control with quality.
In the construction method, can install in advance it is each across whole brackets, and can be shifted to an earlier date according to progress installation template and
Assembling reinforcement, therefore worker can be reduced and slowed down the generation of phenomenon, reduce artificial loss.
Detailed description of the invention
Fig. 1 is each in embodiment one across the interior schematic diagram for arranging whole brackets.
Fig. 2 is the support schematic diagram in embodiment one in segmental construction.
Fig. 3 is the support schematic diagram in embodiment one after the completion of segmental construction.
Fig. 4 is the support schematic diagram in embodiment one in end bay cast-in-place section construction.
Fig. 5 is the support schematic diagram in embodiment one in end bay closure section construction.
Fig. 6 is the support schematic diagram in embodiment one in the construction of midspan closing section.
Fig. 7 is the schematic diagram in embodiment one after the completion of full-bridge construction.
Fig. 8 is each in embodiment two across the interior schematic diagram for arranging whole brackets.
Fig. 9 is the support schematic diagram in embodiment two in segmental construction.
Figure 10 is the support schematic diagram in embodiment two after the completion of segmental construction.
Figure 11 is the support schematic diagram in embodiment two in end bay cast-in-place section construction.
Figure 12 is the support schematic diagram in embodiment two in end bay closure section construction.
Figure 13 is the support schematic diagram in embodiment two in the construction of midspan closing section.
Figure 14 is the schematic diagram in embodiment two after the completion of full-bridge construction.
Have in figure: No. zero block 1, bracket 2, construction completion cantilever 3, construction segment 4, construction segment underlying holder 5, maximum are outstanding
Arm section 6, end bay Cast-in-Situ Segment 7, end bay closure section 8, end bay closure section underlying holder 9, temporary rest pier 10, midspan closing section 11, in
The Wavelike steel webplate 3-2 of top plate 3-1, construction completion that across closure section underlying holder 12, construction are completed, construct the bottom plate 3- completed
3, it constructs segment top plate 4-1, construction segment Wavelike steel webplate 4-2, construction segment bottom plate 4-3, construction bottom plate underlying holder 5, most
Great cantilever section top plate 6-1, maximum cantilever section Wavelike steel webplate 6-2.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
Embodiment one, using three across prestressed concrete continuous beam as embodiment, a kind of segment bracket construction party of beam bridge
Method, its technical solution is as follows:
The first step, the designing material for collecting detailed construction quality, water temperature geology and foundation, consideration load,
The factors such as topography and geomorphology, soil layer construction, soil condition, ambient enviroment, Characteristics of Groundwater, adjacent buildings select basement process
Method carries out cure process to ground, make its bearing capacity and stability be enough to bear bracket transmitting superstructure from heavy burden
It carries.
Second step, mounting bracket.Referring to Fig. 1, is constructed using support cast-in-place and originate No. zero block 1.It is quasi- according to the trend of beam bridge
That really releases bracket 2 sets up range and vertically and horizontally spacing arrangement, and clears up earth's surface nearby.To the intensity and stabilization of bracket 2
Property checking computations, calculated result should meet code requirement.Between bridge pier and between bridge pier and abutment, the whole brackets 2 of arrangement, every
Rack rod is respectively provided with standard base, and in the lower section cushioning lumps of wood, with dispersive stress, prevents stress from concentrating.Bracket 2 is installed
Afterwards, carry out pre-pressing bracket processing with water bag or sand pocket classification, generally can by 0,25%, 50%, 100%, 120%, 100%,
50%, 25%, 0 sequence is loaded, and eliminates its inelastic deformation, and observes its flexible deformation, and combines longitudinal slope and pre- arch
The factors such as degree calculate bracket absolute altitude.The easy lowering device of setting on 2 top of bracket, and can guarantee in prestressed strand tensioning
When, the frictional resistance between construction segment and below horizontal direction energy Free Transform between bracket, as far as possible reduction bracket and beam body.
The construction of third step, progress from No. two blocks to maximum cantilever.Workbench is set in bridge pier two sides, evenly paragraph by paragraph
It constructs to span centre, until bridge span structure joins the two sections of a bridge, etc.Referring to fig. 2, retain the bracket 5 below construction segment, complete the mould of construction segment 4
The work such as the installation of plate, reinforcing bar, and mould absolute altitude is verified, casting concrete, reaches strength criterion to it, carries out prestressing force thereafter
The tensioning of steel strand wires.Referring to Fig. 3, after the completion of tensioning, the original construction construction of segment 4 is finished, and is become to have constructed and is completed one of cantilever 3
Point, the bracket of the segment and template are disengaged with the lowering device of bracket, the conversion of stress system is completed, forms the rigid structure of T-type
Statically determinate structure removes the bracket below the segment later.
4th step repeats third step until construction reaches maximum cantilever section 6, referring to fig. 4, using support cast-in-place method construction side
Across Cast-in-Situ Segment 7.
5th step, referring to Fig. 5, carry out end bay closure section 8 and construct.Pay attention to the height difference of closure section two sides beam-ends, stiffness is installed
Skeleton, to guarantee closure section two sides without relative displacement.Installation template, reinforcing bar verify mould absolute altitude, casting concrete, tensioning steel
Twisted wire removes end bay closure section underlying holder 9.
6th step, referring to Fig. 6, remove temporary rest pier 10 at main pier fulcrum, carry out midspan closing section 11 and construct.Join the two sections of a bridge, etc preceding school
Positive rack absolute altitude, installs midspan closing stiff skeleton, and installation template, reinforcing bar verify mould absolute altitude, casting concrete, tensioning steel
Twisted wire removes midspan closing section underlying holder 12.
7th step, referring to Fig. 7, tensioning externally cable, bridge floor of mating formation complete construction.
Embodiment two, using three across Wavelike steel webplate prestressed concrete continuous box girder bridges as embodiment, a kind of section of beam bridge
Section stand construction method, its technical solution is as follows:
The first step carries out cure process to ground.It ties on the top for making its bearing capacity and stability be enough to bear bracket transmitting
The gravity load of structure.
Second step, mounting bracket.Referring to Fig. 8, is constructed using support cast-in-place and originate No. zero block 1.It is quasi- according to the trend of beam bridge
That really releases bracket 2 sets up range and vertically and horizontally spacing arrangement, and clears up earth's surface nearby.To the progress intensity of bracket 2 and surely
Qualitative checking computations, calculated result should meet code requirement.Between bridge pier and between bridge pier and abutment, whole brackets 2 are arranged, often
Root rack rod is respectively provided with standard base, and in the lower section cushioning lumps of wood, with dispersive stress, prevents stress from concentrating.Bracket 2 installs
Cheng Hou carries out pre-pressing bracket processing with water bag or sand pocket classification, generally can by 0,25%, 50%, 100%, 120%, 100%,
50%, 25%, 0 sequence is loaded, and eliminates its inelastic deformation, and observes its flexible deformation, and combines longitudinal slope and pre- arch
The factors such as degree calculate bracket absolute altitude.The easy lowering device of setting on 2 top of bracket, and can guarantee in prestressed strand tensioning
When, the frictional resistance between construction segment and below horizontal direction energy Free Transform between bracket, as far as possible reduction bracket and beam body.
The construction of third step, progress from No. two blocks to maximum cantilever.Workbench is set in bridge pier two sides, evenly paragraph by paragraph
It constructs to span centre, until bridge span structure joins the two sections of a bridge, etc.Referring to Fig. 9,3-1,3-2 and 3-3 are the top plate portion of construction completion, waveform respectively
Steel web part and bottom parts retain the bracket 5 below construction bottom plate 4-3, install Wavelike steel webplate 4-2, complete construction
The work such as installation of top plate 4-1, the template of bottom plate 4-3 of constructing, reinforcing bar, and verify mould absolute altitude, casting concrete thereafter, to it
Reach strength criterion, carries out the tensioning of prestress wire.After the completion of tensioning, the bracket of the segment is made with the lowering device of bracket
It is disengaged with template, completes the conversion of stress system, the statically determinate structure of the rigid structure of T-type is formed, later below Demolition Construction bottom plate 4-3
It is as shown in Figure 10 to form structure for bracket 5.
4th step, the construction for carrying out end bay Cast-in-Situ Segment.Third step is repeated until construction reaches maximum cantilever, referring to Figure 11,
It uses the Wavelike steel webplate 6-2 of maximum cantilever section as support, the template and reinforcing bar of the side of being installed on it top plate 6-1, and pours coagulation
Soil, stretch-draw prestressing force steel strand wires, using support cast-in-place method construction end bay Cast-in-Situ Segment 7.
5th step, referring to Figure 12, carry out the construction of end bay closure section 8.Pay attention to the height difference of closure section two sides beam-ends, strength is installed
Property skeleton, to guarantee closure section two sides without relative displacement.Installation template, reinforcing bar verify mould absolute altitude, casting concrete, tensioning
Steel strand wires remove end bay closure section underlying holder 9.
6th step, referring to Figure 13, remove temporary rest pier 10 at main pier fulcrum, carry out midspan closing section 11 and construct.Before closure
Correcting bracket absolute altitude, installs midspan closing stiff skeleton, and installation template, reinforcing bar verify mould absolute altitude, casting concrete, tensioning
Steel strand wires remove midspan closing section underlying holder 12.
7th step, referring to Figure 14, tensioning externally cable, bridge floor of mating formation complete construction.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation described
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (7)
1. a kind of segment bracket construction method of beam bridge, which is characterized in that the construction method the following steps are included:
The first step, ground hardening processing；
Second step, each across the whole brackets of interior arrangement, and carry out pre-pressing bracket processing；
Third step, evenly in bridge pier two sides, section completes installation template, reinforcing bar, casting concrete section by section, and stretch-draw prestressing force steel twists
Line removes bracket below after tensioning is completed in each segment；
When 4th step, construction reach maximum cantilever, end bay Cast-in-Situ Segment of constructing；
5th step, installs end bay closure section stiff skeleton, and end bay closure removes end bay closure section bracket；
6th step cancels the temporary consolidation of pier, beam, installs midspan closing section stiff skeleton, and midspan closing removes midspan closing section
Bracket；
7th step, tensioning externally cable, bridge floor of mating formation.
2. the segment bracket construction method of beam bridge according to claim 1, which is characterized in that the ground hardening in the first step
The bearing capacity for reinforcing ground is handled, it is made to be enough to bear the gravity load of the superstructure of bracket transmitting, treating method
A method, native compaction pile method, water are developed including cushion, preloading method, heavy-tamping method, vibroflotation, Sand Pile Method, Lime Flyash Pile Method, column hammer
Soil paddling process, jet grouting, single liquid law of planning or soda solution grouting, improve foundation capability, differential settlement amount
It reduces, frost heave is reduced, and improves the stability of bracket and superstructure.
3. the segment bracket construction method of beam bridge according to claim 1, which is characterized in that each across interior cloth in second step
Before setting whole brackets, strength and stability checking computations are carried out to the main component of bracket, calculated result should meet code requirement, sufficiently
The influence for considering longitudinal slope and camber carries out pre-pressing bracket processing, eliminates its inelastic deformation after bracket is installed, and
Its flexible deformation is observed, provides foundation for mould absolute altitude.
4. the segment bracket construction method of beam bridge according to claim 3, which is characterized in that the bracket should have simplicity
Lowering device, and can guarantee in prestressed strand tensioning, construct segment and below between bracket horizontal direction can be freely
Frictional resistance between deformation, as far as possible reduction bracket and beam body.
5. the segment bracket construction method of beam bridge according to claim 1, which is characterized in that in third step, the balance
In bridge pier two sides, section completes installation template, reinforcing bar, casting concrete, stretch-draw prestressing force steel strand wires section by section on ground, is that will construct
Segment below bracket on carry out Piecemeal erection template, reinforcing bar, mould absolute altitude is verified after installation, carries out concreting later
With prestressed stretch-draw.
6. the segment bracket construction method of beam bridge according to claim 1, which is characterized in that described every in third step
After tensioning is completed in a segment, bracket below is removed, is first to use the lowering device of bracket after tensioning is completed in each segment
The bracket and template for making the segment disengage, and complete the conversion of stress system, then remove the bracket below the segment.
7. the segment bracket construction method of beam bridge according to claim 1, it is characterised in that, can according to construction speed arrangement
To install the template and reinforcing bar of segment of not constructing in advance.
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| CN111119071A (en) * | 2020-01-16 | 2020-05-08 | 中建七局安装工程有限公司 | Construction method for assembling precast concrete segment box girder |
| CN113403953A (en) * | 2021-06-25 | 2021-09-17 | 中铁十二局集团有限公司 | Construction method for turnout continuous beam of grand bridge of elevated station |
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Application publication date: 20190524 |