CN102787560B - Integrated construction method of support of large cantilevered capping beam and vertical column - Google Patents
Integrated construction method of support of large cantilevered capping beam and vertical column Download PDFInfo
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Abstract
The invention relates to the field of municipal engineering and aims to provide an integrated construction method of a support of a large cantilevered capping beam and a vertical column. The method sequentially includes a construction preparation stage, a first support set-up stage, a vertical column construction stage, a second support set-up stage, a capping beam construction stage and a support detachment stage. A support used in the vertical column construction stage and a support used in the capping beam construction stage are designed integrally, and steel pipe columns are supporting components for capping beam construction and also are scaffold components for vertical column construction, so that construction materials and labor forces can be effectively saved, and construction progress is accelerated. Further, the integrated construction method of the support of the large cantilevered capping beam and the vertical column can be extendedly applied to construction of concrete structures such as beam slabs with big cantilevers, long span and large size.
Description
Technical field
The present invention relates to field of bridge construction, specifically, is a kind of large suspend coping in town road and the rack integral construction method of column.
Background technology
Along with socioeconomic development, automobile progresses into family, make public vehicles recoverable amount increase severely and the limited contradiction in urban space, traffic congestion has become normality, urban traffic to high-altitude or underground development inevitable.Intensive at road surrounding building, in the situation that street is difficult to again widen, adopt the viaduct can relief of traffic closeness, improve conevying efficiency.In current domestic large size city, elevated bridge construction has formed scale, is still difficult to meet growing traffic pressure, and elevated bridge has the trend of past multilayer, higher future development.
The construction Dou Shi branch of conventional road surface viaduct carries out, and first carries out setting up of column construction scaffolding, to complete the construction of bridge column; After column forms, carry out the construction of the bridge coping on column, construction at this moment just needs to remove the column construction scaffolding of originally setting up, then is setting up of full framing, is convenient to carry out the Coping Construction on column again.If at this moment carry out the engineering construction of superelevation bridge in the relatively busy city of traffic, certain elevated overpass of once meeting such as inventor, bridge floor overhead peak has 32m, column height is many more than 15m, adopt drilled pile to add cushion cap foundation, substructure is that high column strengthens cantilever bent cap, and top adopts prefabricated case beam, and Bridge Erector sets up; The two ends of bent cap cantilever were in both sides ring road top at that time, the ground level road Construction traffic that will pass through when construction, and on the ring road of both sides, traffic can not be interrupted again, and the full framing system therefore generally adopting in original construction became very inapplicable; And the scheme of establishing built-in fitting on column exists the hidden danger of column appearance damage and Welding Safety reliability.
To sum up, to how rationally to determine construction bracket form, to guarantee that under bridge, traffic is normally current, guarantee column capping construction support system safety and stability, accelerate engineering construction progress, reducing periphery resident impact etc. is all to need a difficult problem to be solved in current similar bridge construction.
Summary of the invention
The object of the invention is, in order to overcome deficiency of the prior art, provides the rack integral construction method of a kind of large suspend coping and column.
In order to realize object of the present invention, technical scheme of the present invention is:
A rack integral construction method for large suspend coping and column, order comprises following several stages successively: Construction in Preparatory Stage, support are set up first stage, column construction stage, support and set up second stage, Coping Construction stage and support teardown phase;
Described Construction in Preparatory Stage comprises establishment, material lease (buying) and the test of support scheme, the construction on steel pipe column basis;
Described support set up the first stage comprise that the installation of steel pipe column, steel pipe column footing steel concrete are fixed, between steel pipe column link that bar is installed, the setting up of column operation platform;
Described support is set up and in the installation, Bailey beam of connection construction that second stage comprises steel pipe column and column, Bailey beam, is laid channel-section steel or i iron crossbeam, ground is adjusted setting up of absolute altitude steel pipe frame and adjusted laying of absolute altitude steel pipe frame.
As a further improvement on the present invention, in described support teardown phase, support is removed and is laterally carried out to centre position by two cantilever end symmetries, vertically carries out from top to bottom, sequentially stripping, Wooden Batten, φ 48 steel pipes, channel-section steel (i iron), Bailey beam, steel pipe column etc.
The present invention adopts the crude steel tubing strings such as diameter 609mm wall thickness 16mm and sizing Bailey beam composition sectional shelf-unit system, in the bridge column construction stage, crude steel tubing string is as the main supporting member of construction scaffolding, and Coping Construction stage steel pipe column and Bailey beam combine as capping construction support; In the Coping Construction stage, this sectional shelf-unit system has rationally been utilized the good anti-bending strength of Bailey beam and the good compressive property of steel pipe column.The present invention utilizes the basis of suspended deck structure as steel pipe column, safe and reliable; Bailey beam is placed in steel pipe column top and effectively connects, and on Bailey beam top, channel-section steel or i iron crossbeam is set, and sets up φ 48 steel pipe supports in order to absolute altitude at the bottom of adjustment structure on crossbeam; Structure construction whole load is by steel pipe support power transmission to crossbeam power transmission, and then power transmission, to Bailey beam longeron, then reaches cushion cap by steel pipe buttress by load, and steel pipe is connected by concrete is fixed with cushion cap.On column, certain distance arranges anchor ear connection, and steel pipe buttress adopts shaped steel to be connected with anchor ear, to strengthen the security and stability of steel pipe column.
Because the support of the support of column construction stage use and the use of bent cap structure construction stage is carried out integrated design by the present invention, steel pipe column is the supporting member of Coping Construction, also be the scaffold member of column construction, therefore the present invention can effectively save construction material and labour's use, accelerating construction progress.
Compared to existing technology, beneficial effect of the present invention is embodied in:
1, the integrated bracket of bent cap and column has sufficiently and reasonably utilized the good anti-bending strength of Bailey beam and the good compressive property of steel pipe column.Fixed and increase the construction measure such as be connected between steel pipe column and column by steel pipe column bottom is set in addition, effectively reduce the drift of steel pipe column, make this sectional shelf-unit system there is higher security and stability.
2, this sectional shelf-unit system features such as distance is large that make full use of that steel pipe column floor space is few, Bailey beam is encorbelmented; Can effectively reduce ground space is taken on the one hand, for traffic above-ground is current, Construction Arrangement etc. striven for more place; Can directly utilize on the other hand the basis of cushion cap as steel pipe column, basis needn't be separately set again.
3, because steel pipe column, Bailey beam are standard element, quality of materials is safe and reliable, is easy to check, mechanization of building operation degree is high, and working procedure is simple and easy, and speed of application is relatively very fast.
The present invention adopts the construction of steel pipe column and Bailey beam sectional shelf-unit system, and applicable to the construction bracket of the higher pier stud of bridge and large suspend coping, initial estimate pier stud height has higher economic advantages in the time that 15m is above.Integrated bracket speed of application is fast, takes up room little, and strutting system is stable, and this engineering method is extensible applies to the large cantilevers such as beam slab, greatly across footpath, concrete structure construction that build is larger.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the inventive method;
Fig. 2 is steel pipe column and the Bailey beam sectional shelf-unit system elevation adopting after the inventive method;
Fig. 3-Fig. 6 is the precedence diagram of erection of steel pipe column construction;
Fig. 7 is the fixed structure chart of steel pipe column footing;
Fig. 8 is the top view of Fig. 7;
Fig. 9 is the connection diagram of steel pipe column and column;
Figure 10 is the top view of Fig. 9.
In figure: 1, bent cap; 2, operating platform; 3, φ 48 steel pipe supports; 4,25#A channel-section steel; 5, Bailey beam; 6, column; 7, steel pipe column; 8, between steel pipe column, 16# channel-section steel links bar; 9, between steel pipe column and column, 16# channel-section steel links bar; 10, steel bar concrete; 11, cushion cap; 12, φ 25 reinforcing bars; 13,12# channel-section steel; 14,16# channel-section steel anchor ear; 15,16# channel-section steel links bar.
The specific embodiment
Further illustrate technical scheme of the present invention below by the specific embodiment.
As shown in Figure 1, the rack integral construction method of large suspend coping of the present invention and column, order comprises following several stages successively: Construction in Preparatory Stage, support are set up first stage, column construction stage, support and set up second stage, Coping Construction stage and support teardown phase;
One, Construction in Preparatory Stage:
1. support programming
The large cantilever bent cap structure of high column bridge, selects steel pipe column Bailey beam sectional shelf-unit system.(GB50009-2001) calculate bent cap structure construction load according to " loading code for design of building structures ", calculate maximum shear, the moment of flexure that Bailey beam is born, the maximum stress value of steel pipe column according to working load.Bailey beam is allowed maximum stress value 300Mpa, allows maximum shear 245250N, and steel pipe column is allowed maximum stress value 143Mpa.Diameter 609mm wall thickness 16mm steel pipe column is Common Steels tubing string, and domestic Bailey beam is conventional Bailey beam.Support scheme need be expounded through peer review by building matter [2009] No. 87 " project with relatively greater danger management methods ", and rack form is shown in steel pipe column and the Bailey beam sectional shelf-unit system elevation of Fig. 2.
2. material lease (buying) and test
φ 609 steel pipes, domestic Bailey beam are approved product, select according to actual needs lease or buying.The material sampling such as φ 609 steel pipes of marching into the arena, φ 48 steel pipes, 16# channel-section steel, Bailey beam are carried out to mechanical property test, carry out outward appearance and size simultaneously totally and check and accept.Forbid to use on support to not meeting the material of standard or designing requirement.
3. steel pipe column foundation construction
In the steel pipe support programming stage, first-selected steel pipe column stands on cushion cap, lays while requiring as can not be met steel pipe column because dimension of platform is little, needs arrange separately in addition reinforced concrete foundation.With φ 609 steel pipes, wall thickness 16mm is example, and every joint steel pipe column top, bottom are provided with solid flange, and while reaching allowable bearing 143Mpa by steel pipe, support is calculated as pressure of foundation:
Steel pipe axis of a cylinder power F=σ
1a
1=143 × π × (609 × 609-577 × 577) ÷ 4=4260301.76N
σ
1: steel pipe column stress, A
1: steel pipe column sectional area,
Pressure σ is born on basis
2=F/A
2=4260301.76 ÷ (π 609 × 609 ÷ 4)=14.6MPa.
σ
2: basic compression chord, A
2: flange area,
According to result of calculation, C30 cushion cap or C30 steel reinforced concrete basis can meet the requirement on steel pipe column basis.Steel reinforced concrete key dimension is determined according to steel pipe column size and soil matrix bearing capacity.
Two, first stage rack construction
1. erection of steel pipe column
Steel pipe column adopts segmentation to install, and Common Steels tubing string has all size such as 9 meters, 6 meters, 4 meters, 3 meters, 2 meters, 1 meter, selects steel pipe length combination according to column height, and steel pipe two ends arrange flange, with bolts between two sections of steel pipes.
The erection sequence of steel pipe column 7 is shown in the erection of steel pipe column sequence of construction figure of Fig. 3-Fig. 6; The connecing high and link the installation of bar of steel pipe column, operates on ladder truck cranking arm by constructor.
The first step (seeing Fig. 3): take two steel pipe columns 7 as unit, link up and down the connection of bar on ground; Linking bar is 16# channel-section steel.
Second step (seeing Fig. 4): with loop wheel machine by steel pipe column 7 vertically on cushion cap 11.
The 3rd step (seeing Fig. 5): workman connects remaining channel-section steel on ladder truck and links bar cranking arm, and forms framework.
The 4th step: workman carries out the height that connects of steel pipe column 7 cranking arm on ladder truck.
2. steel pipe column footing is fixed with steel concrete
After steel pipe column 7 installation in position, for improving the load-carrying properties of steel pipe column 7, steel pipe column 7 footing are fixed.The fixing reinforced concrete structure that adopts of footing, reinforcing bar φ 25 reinforcing bars 12 reserved by basis and rear placement form, and steel bar concrete 10 is built after forming spider structure by 4 12# channel-section steels, and fixed rear formation is of a size of 1 meter of length and width, and 0.3 meter is high.
3. between steel pipe column, linking bar installs
Residue between steel pipe column 7 is linked to bar and install, by 1.7 meters of one settings of spacing, link bar and steel pipe column 7 is with bolts.Linking bar can be used as column construction operation platform in the column construction stage and sets up.Link bar and adopt loop wheel machine lifting to put in place, installation personnel stands on the ladder truck of cranking arm and installs.
4. column construction operation platform is set up
For guaranteeing column reinforcing bar, template construction operation, must be at the each height and position setting operation of steel pipe column platform.Utilize the channel-section steel between steel pipe to link bar, link and on bar, arrange steel pipe two, steel pipe with link bar fastener and block, then on steel pipe, completely spread pin hand sheet, at operating platform one circle, Dense mesh screen need be set simultaneously.
Three, bridge column construction
The bridge column construction stage, utilize the channel-section steel of support to contact bar, arrange steel pipe, pin hand sheet, as pillar construction construction operation platform, personnel carry out reinforcing bar, template construction on operating platform.Column construction need pay special attention to control concreting speed, stable to guarantee model of the column.Bridge column is also the important base that bent cap support is reinforced, and in this engineering method of concrete structure construction method, does not elaborate.
Four, second stage rack construction
1. steel pipe column and column connection construction
According to the link position that requires to arrange steel pipe column 7 and column 6 in support scheme, this connection is the calculated length in order to reduce steel pipe column 7, improves steel pipe column stress performance.Generally be less than 10 meters by spacing 16# channel-section steel anchor ear 14 is set one, and top of the trellis, bottom must arrange; Connect 16# channel-section steel again and link bar 15, type of attachment is shown in Fig. 9 and Figure 10.Wherein steel pipe buttress and column connect by spacing and are not more than together with 10m and arrange, and laterally connection is corresponding with steel pipe buttress for link position; Column anchor ear, steel pipe buttress are connected with column and are 16# channel-section steel.
2. Bailey beam is installed
Bailey beam adopts loop wheel machine lifting, and three artificial cooperations lay.Hawser of each bolt at Bailey beam two ends, is held by a people for every, in Bailey beam lifting process, artificial stay cord is to control its Bailey beam direction, when Bailey beam winches to steel pipe column top, the workman on the operating platform of top commands loop wheel machine, slowly puts Bailey beam to desired location.
3. crossbeam is installed
First in Bailey beam, carry out the setting-out of channel steel cross beam position according to constructure scheme, then utilize loop wheel machine by channel-section steel or i iron crossbeam by root hoisted in position, manually in Bailey beam, coordinate loop wheel machine accurately that channel steel cross beam is in place.
4. adjust absolute altitude to set up and install with steel pipe frame
The vertical rod of φ 48 steel pipe supports 3 is by 60 × 60cm layout, and step pitch arranges by being not more than 120cm, and the bar of sweeping the floor, bridging must be set on request.Steel pipe frame is set up on the ground at the reserved field on ground, after having set up, carries out integral hoisting, is placed on the crossbeam of 25#A channel-section steel 4 or i iron formation, and all vertical rods must stand on crossbeam.Steel pipe frame rear inspection in place is adjusted vertical rod and is all contacted with crossbeam, stressed to guarantee all vertical rod entirety.
Five, the Coping Construction stage
1. bent cap reinforcing bar, template, concrete construction all rely on its underpart support, (CJJ2-2008), concrete construction method does not elaborate in this engineering method with " Urban Bridge engineering construction and inspection of quality standard " according to design drawing for structure construction and examination.
2. concrete pouring construction priority control
(1) pouring order of concrete
The characteristic of encorbelmenting greatly according to supporting structure, concrete pouring construction must be built toward both sides symmetry from middle, inhomogeneous stressed to reduce support.
(2) real time on-line monitoring
Bent cap support adopts large diameter steel pipe buttress Jia Beilei sheet longeron combined system.Consider that this kind of rack form uses less and support height is larger, for guaranteeing the safe and reliable of strutting system, in line with the principle of careful careful design, conscientious careful installation and real-time synchronization monitoring, foil gauge is arranged at important node position at strutting system, carry out the Real-Time Monitoring of strutting system, to grasp in time the true stress situation at the each position of strutting system, for practice of construction provides first hand data.
Suggestion foil gauge position is as follows:
1., steel pipe buttress has 4 in strutting system, for being arranged symmetrically with, every steel pipe pier is at least arranged one, and chooses relatively foil gauge of one of a upper and lower each layout of steel pipe buttress, need arrange 6;
2. on the each rod member of Bailey bracket, directly over steel pipe buttress position, (vertical rod, brace, chord member etc.) arrange foil gauge, and 4 of Bailey bracket meters, are positioned on 4 steel pipe piers, consider the inhomogeneities that Bailey bracket is stressed, need arrange 12;
3. on the connecting rod, between steel pipe buttress and column anchor ear, arrange foil gauge, to obtain the true stress situation of connecting rod, San Ge position, upper, middle and lower arranges respectively, need arrange 6.
Six, support teardown phase
Support Demolition Construction.Bent cap structure can be carried out support dismounting after reaching design strength 100%.Support is removed and is laterally carried out to centre position by two cantilever end symmetries, vertically carries out from top to bottom, orderly release template, Wooden Batten, φ 48 steel pipes, channel-section steel (i iron), Bailey beam, steel pipe column etc.First from φ 48 steel pipes are removed, between φ 48 steel pipes and the bed die lumps of wood, be provided with timber wedge, by pounding out timber wedge, loosening steel pipe support, then carries out support dismounting.The materials such as template, Wooden Batten, steel pipe, channel-section steel unload to fall behind to be placed in Bailey beam and hang down with loop wheel machine, and Bailey beam, steel pipe column etc. unloads with loop wheel machine in time after successively removing tie element.Operating personnel's operation in lower floor's operating platform in demolishing process, operating platform surrounding arranges safety prevention measure.
Main material of the present invention and equipment have:
1, support main material
Φ 609 steel pipe columns (or other model crude steel tubing strings), domestic Bailey beam, 25# channel-section steel or 22# i iron (according to structural load), Φ 48 steel pipes, 16# channel-section steel (between steel pipe column, link, steel pipe column and column link), pin hand sheet, Dense mesh screen.
2, capital equipment
Take single rack construction as example, its main plant sees the following form:
The present invention is according to constructure scheme construction in work progress, and steel pipe column, Bailey beam are set up by scheme and carried out an acceptance inspection, and adjusts absolute altitude steel pipe support (DB33/1035-2006) to check and accept by " building operations Formwork-supportof Fastener-style Steel Pipe tecnical regulations ".
Bring into use the stage should adopt real time on-line monitoring system to carry out monitoring to the situation such as ess-strain and sedimentation deformation of sectional shelf-unit system, with the security reliability of monitoring integrated bracket system, monitoring strutting system actual loading and distortion etc. meet situation with design-calculated.
Support is set up allowable variation
One, dominant item
Support use steel pipe column, Bailey beam, linking the materials such as bar need be consistent with scheme;
2. rack form is consistent with support scheme;
Two, general data
Steel pipe column verticality≤3 ‰ and≤10mm, steel pipe column position deviation≤10mm.
2. Bailey beam position deviation≤10mm.
3. φ 48 steel pipe supports meet " building operations Formwork-supportof Fastener-style Steel Pipe tecnical regulations " (DB33/1035-2006).
The present invention is carried out to performance analysis below, take 20 meters high bent cap structures as example, bent cap and column integrated bracket and traditional column and bent cap are set up respectively support and are contrasted, as follows:
1, duration benefit
Integrated bracket can be proceeded follow-up support and set up after column has been constructed, and last property is removed, and support is set up and taken time altogether approximately 5 days.Conventional column Coping Construction need be removed column construction scaffolding in the time of Coping Construction, then carries out bent cap support and sets up.Stud scaffold is taken, is torn open, and bent cap support is taken, torn open, needs altogether approximately 10 day time.
2, economic benefit
Integrated system is taken and is torn 4 scaffolders of need and a loop wheel machine open, and bent cap full framing is set up needs 10 scaffolders, and relatively two kinds of strutting systems are set up work consuming every day (containing loop wheel machine) appropriate litigation fees.The material rental charge of Bailey beam and steel pipe support contrast full framing system every day is suitable.Because the integrated bracket construction period reduces, the corresponding minimizing of lease expenses.Integrated bracket with set up support at twice and saved the expense that column construction scaffolding is taken, torn open.Steel pipe column and Bailey beam sectional shelf-unit system are little to below traffic impact in addition, have saved traffic administration expense, obtain good economic benefit, as following table:
3, social benefit
Full framing needs full hall to arrange below bent cap, and influence basin is large, as there is the demand of being open to traffic below, and only can be by wicket hole mode be set.Under steel pipe column and Bailey beam sectional shelf-unit system floor space, be completely covered with pin hand sheet, Dense mesh screen on Bailey beam lower chord, below can be open to traffic safely.Steel pipe column and the Bailey beam sectional shelf-unit system social benefit of comparing is good.
Finally, it is also to be noted that, what more than enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above examples of implementation, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (2)
1. the rack integral construction method of a large suspend coping and column, it is characterized in that, order comprises following several stages successively: Construction in Preparatory Stage, support are set up first stage, column construction stage, support and set up second stage, Coping Construction stage and support teardown phase;
Described Construction in Preparatory Stage comprises establishment, material lease (buying) and the test of support scheme, the construction on steel pipe column basis;
Described support set up the first stage comprise that the installation of steel pipe column, steel pipe column footing steel concrete are fixed, between steel pipe column link that bar is installed, the setting up of column operation platform;
Described support is set up and in the installation, Bailey beam of connection construction that second stage comprises steel pipe column and column, Bailey beam, is laid channel-section steel or i iron crossbeam, ground is adjusted setting up of absolute altitude steel pipe frame and adjusted laying of absolute altitude steel pipe frame.
2. the rack integral construction method of large suspend coping according to claim 1 and column, it is characterized in that, in described support teardown phase, support is removed and is laterally carried out to centre position by two cantilever end symmetries, vertically carry out from top to bottom, sequentially stripping, Wooden Batten,
48 steel pipes, channel-section steel (i iron), Bailey beam, steel pipe column.
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| CN104878695B (en) * | 2015-05-21 | 2017-01-18 | 上海市政建设有限公司 | Viaduct cover beam shaping bottom die support and application method thereof |
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| CN107653781A (en) * | 2017-09-20 | 2018-02-02 | 龙元建设集团股份有限公司 | Big steel pipe truss and construction method for bent cap cast-in-place construction |
| CN109653244B (en) * | 2018-11-21 | 2019-10-22 | 中铁十八局集团有限公司 | Intersect the Bailey truss system and its construction method of protection applied to complicated tube cable |
| CN110184927A (en) * | 2019-05-14 | 2019-08-30 | 宁波市政工程建设集团股份有限公司 | A kind of Y type pier stud construction method using Bailey bracket |
| CN110184926A (en) * | 2019-05-14 | 2019-08-30 | 宁波市政工程建设集团股份有限公司 | A kind of public affairs rail is built together the overhead pier stud construction method of double-layer integrallyization |
| CN110184928A (en) * | 2019-05-14 | 2019-08-30 | 宁波市政工程建设集团股份有限公司 | A kind of pier stud construction method that the public rail using falsework is built together overhead |
| CN110804948B (en) * | 2019-10-31 | 2021-05-11 | 安徽省路港工程有限责任公司 | Construction method of steel pipe pile bailey truss foundation full-space bracket system |
| CN113235448B (en) * | 2021-05-31 | 2022-06-21 | 中铁四局集团第四工程有限公司 | Installation method of main line crossing ultrahigh steel pipe column system |
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| CN101858055A (en) * | 2010-06-04 | 2010-10-13 | 中交第一航务工程局有限公司 | Setting steel pipe bracket support system of cover beam and construction method thereof |
| US8656543B2 (en) * | 2010-07-13 | 2014-02-25 | Encon Technologies, Llc | Bridge shoring system |
| JP5668252B2 (en) * | 2010-10-13 | 2015-02-12 | 株式会社安藤・間 | Joint structure of steel superstructure and concrete column |
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