CN108638324A - A kind of construction method of prefabricated case beam - Google Patents
A kind of construction method of prefabricated case beam Download PDFInfo
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- CN108638324A CN108638324A CN201810522023.7A CN201810522023A CN108638324A CN 108638324 A CN108638324 A CN 108638324A CN 201810522023 A CN201810522023 A CN 201810522023A CN 108638324 A CN108638324 A CN 108638324A
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- mould bases
- exterior sheathing
- binding
- pedestal
- concrete
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000004567 concrete Substances 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 62
- 230000002787 reinforcement Effects 0.000 claims abstract description 51
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 45
- 238000000465 moulding Methods 0.000 claims abstract description 31
- 238000009415 formwork Methods 0.000 claims abstract description 18
- 230000036541 health Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 21
- 210000003205 muscle Anatomy 0.000 claims description 21
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 25
- 238000003466 welding Methods 0.000 abstract description 15
- 239000002893 slag Substances 0.000 abstract description 9
- 230000008569 process Effects 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009408 flooring Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
- B28B7/0017—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps for attaching mould walls on mould tables
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The application provides a kind of construction method of prefabricated case beam, includes the following steps：Make concrete pedestal.Exterior sheathing is installed in the concrete pedestal, obtains box beam side form.Bottom web reinforcement binding mould bases and roof steel bar binding mould bases and the binding for carrying out reinforcing bar are made respectively.It will bind in molding bottom web reinforcement integral hoisting to box beam side form, Inner Moulding Board in Building is installed later, and obtain box girder formwork.Molding roof steel bar will be bound to lift to box girder formwork, and internal model back-pressure shoulder pole is installed.Bottom board, web and concrete roof, form removal after molding, the health for cross girders body of going forward side by side.Tensioning, mud jacking, sealing off and covering anchorage processing are carried out after health, obtain prefabricated case beam.It is assembled on pedestal using exterior sheathing, integral hoisting enters the method in mould after reinforcing bar is bound on special die carrier, the problems such as convenient for solving exterior sheathing joint treatment and flatness adjusting, the phenomenon that welding slag sundries falls into influence bottom plate appearance on pedestal is also avoided, the presentation quality of box beam can be effectively improved.
Description
Technical field
The present invention relates to technical field of bridge construction more particularly to a kind of construction methods of prefabricated case beam.
Background technology
In road traffic engineering, large and medium-sized bridge construction project is increased, and the superstructure of bridge largely all can
Using Prestressed Continuous Box Beam form.Precast Concrete Box Girder is the main exposed supporting member of bridge structure, construction technology,
The quality of quality control on construction will directly affect overall stability and the safety of bridge structure, thus be accounted in bridge construction
According to highly important status.
Conventional prefabricated girder construction process includes the reinforcing bar and installed under prestressing, outer of basis installation, bottom plate and web successively
Template and inner template installation, the reinforcing bar of top plate and installed under prestressing, concrete moulding by casting, form removal, health, tensioning, pressure
Slurry, sealing end and etc..In actual use, this process works for flowing water, could be carried out down after the completion together per procedure
Process.The construction for carrying out precast pedestal in prefabricated place first makes, binding welding bottom, web reinforcement on pedestal, then
Exterior sheathing is installed on it again, then internal model, roof steel bar are installed successively, the final cast for carrying out concrete is completed entire prefabricated
The construction of beam.
However, the binding welding bottom web reinforcement first on precast beam pedestal, then carries out the construction work of exterior sheathing assembly
Skill, there are in the binding and welding process of reinforcing bar, welding slag or sundries easily fall into the problem on beam making bench, and are spelled in exterior sheathing
When dress, enough spaces are existed without due to inner bottom web reinforcement, it is difficult to seam and exterior sheathing between template
Flatness is adjusted the problems such as processing.These problems can influence the presentation quality of bottom plate or side plate after pouring into a mould concrete,
And then reduce the presentation quality of prefabricated case beam.
Invention content
This application provides a kind of construction methods of precast beam, to solve in existing Construction of Precast Box Beam, there are welding slag or
Sundries is easily fallen on precast beam pedestal, and phenomena such as be not easy to adjust form joint and flatness, and makes prefabricated case beam presentation quality
The problem of reduction.
A kind of construction method of prefabricated case beam, the construction method include the following steps：
Make concrete pedestal；
Exterior sheathing is installed in the concrete pedestal, obtains box beam side form；
Bottom web reinforcement binding mould bases and roof steel bar binding mould bases and the binding for carrying out reinforcing bar are made respectively；
It will bind in molding bottom web reinforcement integral hoisting to the box beam side form, and carry out the peace of Inner Moulding Board in Building later
Dress obtains box girder formwork；
Molding roof steel bar will be bound to lift to the box girder formwork, and internal model back-pressure shoulder pole is installed；
Bottom board, web and concrete roof, form removal after molding, the health for cross girders body of going forward side by side；
Tensioning, mud jacking, sealing off and covering anchorage processing are carried out after health, obtain the prefabricated case beam.
Optionally, it is carried out at the same time and described described makes the step of exterior sheathing is installed in the concrete pedestal and respectively
The step of bottom web reinforcement binding mould bases and roof steel bar bind mould bases and carry out the binding of reinforcing bar.
Optionally, the bottom web reinforcement binding mould bases includes that lateral mould bases ontology is set to the mould bases sheet with several
Vertical triangle support frame on body；
Support frame as described above is welded with two layers of horizontal corner steel up and down, is equipped with and carves by web hooping spacing on the horizontal corner steel
Slot, support frame as described above brace side are equipped with draw and insert-type positioning pin stick by web horizontal bar spacing.
Optionally, the roof steel bar binding mould bases includes top plate mould bases and ear muscle positioning bar, and the ear muscle positioning bar is equal
The even both sides for being set to the top plate mould bases.
Optionally, the making concrete pedestal includes：The pre-buried channel steel in both sides at the top of the concrete pedestal, and in institute
It states and sebific duct is set in channel steel.
Optionally, the exterior sheathing of being installed in the concrete pedestal includes：The exterior sheathing is lifted to pedestal,
Adjustable collet is installed at the exterior sheathing back vertical supporting bottom, after tentatively fixing the exterior sheathing, is carried out by horizon rule outer
The adjusting of template.
Optionally, described will bind in molding bottom web reinforcement integral hoisting to the box beam side form includes：In web
Steel pipe is worn in the stirrup of top, is integrally lifted the bottom web reinforcement using shoulder pole girder.
Technical solution provided by the present application includes following advantageous effects：
The application provides a kind of construction method of prefabricated case beam, using binding bottom web reinforcement and top on dedicated mould bases
Slab muscle installs exterior sheathing on precast beam pedestal, will bind later in the integral hoisting to template of molding framework of steel reinforcement
Construction method.Compared with existing Constructional Technology in Pre-made Bridge, when exterior sheathing is mounted on precast beam pedestal, inside template not
Reinforcing bar is installed, there are enough spaces to carry out the adjustment processing of template seam, improves the appearance for pouring rear exterior sheathing and installation matter
Amount, and then improve the presentation quality of box beam.Reinforcing bar binds installation on dedicated mould bases, helps to improve reinforcing bar binding quality,
And reinforcing bar binding is not happened on precast beam pedestal, can avoid welding slag, sundries etc. fall on precast beam pedestal and after reducing and pouring
The problem of flooring look quality, helps to improve the presentation quality of box beam.In addition, the installation of external mold and mould bases on precast beam pedestal
The binding of upper reinforcing bar can be carried out at the same time, and effectively raise the construction efficiency of prefabricated case beam.A kind of avoidable welding slag or miscellaneous is provided
Object falls into phenomena such as precast beam pedestal and exterior sheathing seam and not disposable flatness, effectively improves prefabricated case beam appearance matter
Amount, the Construction of Precast Box Beam method of lifting construction efficiency.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of construction method flow chart of prefabricated case beam provided by the embodiments of the present application；
Fig. 2 is the structural schematic diagram that a kind of bottom web reinforcement provided by the embodiments of the present application binds mould bases；
Fig. 3 is the structural schematic diagram that a kind of roof steel bar provided by the embodiments of the present application binds mould bases.
Reference sign：1, mould bases ontology, 2, supporting rack, 21, horizontal corner steel, 22, draw and insert-type positioning pin stick, 23, pin
Stick, 3, top plate mould bases, 4, ear muscle positioning bar.
Specific implementation mode
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and the principle together with specification for explaining the application.
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, other drawings may also be obtained based on these drawings.
Fig. 1 shows a kind of construction method flow chart of prefabricated case beam provided by the embodiments of the present application, should referring to attached drawing 1
Method includes the following steps：
Step 1 (S101)：Make concrete pedestal.
Bed die of the precast pedestal as precast beam subjects most of load of beam body armored concrete, in beam body tensioning
Pedestal two ends subject beam body whole load afterwards, therefore in precast beam abutment design, it need to be to the expansion base of precast pedestal, both ends
Plinth and foundation bearing capacity carry out detailed design and calculate, it is ensured that pedestal disclosure satisfy that the demand that prefabrication of beam recycles.
Step 2 (S102)：Exterior sheathing is installed in concrete pedestal, obtains box beam side form.
Exterior sheathing makes in factory according to the design drawing of prefabricated case beam and processes.To ensure the presentation quality of box beam, external mold
Plate must have sufficiently large intensity, rigidity and stability.Exterior sheathing using 6mm steel plates as panel, using shaped steel as skeleton,
Screw arbor with nut at both-ends is made of 20 round steel of Ф, is arranged two layers, is arranged in the type that in concrete pedestal and box girder formwork is vertical
At the top of steel skeleton.
Template surface greasy dirt is removed before exterior sheathing is assembled and is polished totally, cement mortar must be smeared before polishing, and guarantee template is beaten
Grind effect, the sundries such as twice of rear wipe pattern wash cement slurry of continuous polishing smear parting agent special, with blank sheet of paper wiping template without
Apparent spot, that is, pattern of descriptive parts polishing in place, can be used for concrete construction.Using hand fit's gantry crane by formwork hoisting to platform
On seat, erection sequence is first to install middle section outboard template, then install two ends template.
In existing Constructional Technology in Pre-made Bridge, on pedestal after assembling reinforcement, then the assembly of exterior sheathing is carried out, it is interior at this time
Portion has the presence of reinforcing bar, not enough spaces to be not easy to be adjusted the flatness of template seam and template processing.
And in a kind of prefabricated case beam production method provided in the embodiment of the present application, in the concrete pedestal for not installing reinforcing bar first into
The assembly of row exterior sheathing, due to not installing reinforcing bar inside exterior sheathing also, the inside of exterior sheathing has enough spaces to be convenient for mould
The adjustment of plate seam and grinding process, to improve cast concrete after box beam exterior sheathing presentation quality, improve pre-
The overall appearance quality of box beam processed.
Exterior sheathing is whole when installing must be secured, stable, indeformable, the tight not spillage of piece.Box beam side form integral installation
After the completion, whole flatness detection is carried out, the unqualified position in part is finely adjusted, it is ensured that formwork faulting, which meets specification, to be wanted
It asks, ensures the big surface evenness of box beam entity.
Optionally, in step s 102, exterior sheathing is installed in concrete pedestal includes：Exterior sheathing is lifted to pedestal
On, adjustable collet is installed at exterior sheathing back vertical supporting bottom, after tentatively fixed exterior sheathing, passes through horizon rule and carries out exterior sheathing
It adjusts.After exterior sheathing is lifted to precast beam pedestal, adjustable collet is installed at exterior sheathing back vertical supporting bottom, carries out external mold
The preliminary fixation of plate.The flatness of exterior sheathing installation is improved by the accurate adjusting template of horizon rule on exterior sheathing later.Mould
Be connected firmly by high-strength bolt between plate, external mold after installation is complete installation in time pedestal preformed hole is passed through by pull rod to pull rod
Hole is solid to anchorage.
Step 3 (S103)：Bottom web reinforcement binding mould bases and roof steel bar binding mould bases are made respectively and carry out reinforcing bar
Binding.
Web reinforcement binding mould bases used in bottom is formed by light section or reinforcing bar welding, and mould bases is long, high according to precast beam knot
Depending on structure size.Bottom plate stirrup and web hooping are carried out at the same time binding, bottom plate stirrup is complete right with web hooping when binding
It answers.The binding of bottom web reinforcement and roof steel bar is carried out using special reinforcing bar mould bases, it is easy to operation, and reinforcing bar binding can be improved
Precision and quality.In addition, compared with existing prefabricated girder construction process, the binding place of reinforcing bar, can not on precast beam pedestal
The effective probability for reducing welding slag, sundries etc. and falling on precast beam pedestal, avoids sundries etc. to pouring into a mould concrete back rest bottom plate
The influence of presentation quality improves the presentation quality of box beam.
It should be noted that in the embodiment of the present application, in making reinforcing bar binding mould bases and carrying out the step of ligation of reinforcing bar,
Making and the reinforcing bar binding for carrying out bottom web reinforcement binding mould bases first, can put into next after the binding molding of bottom web reinforcement
Construction usage is walked, the making and binding of roof steel bar are then carried out.Or it is carried out at the same time the system of bottom web and roof steel bar mould bases
Make and binds.It each contributes to improve construction efficiency.
Attached drawing 2 is please referred to, the figure shows a kind of structures of bottom web reinforcement binding mould bases provided by the embodiments of the present application
Schematic diagram.
Optionally, bottom web reinforcement binding mould bases includes that lateral mould bases ontology 1 is set to several on mould bases ontology 1
Vertical triangle support frame 2.Each vertical supporting frame 2 is formed with round steel or reinforcement welding, is marked on each supporting rack 2
Bellows design height position, and setting-out makes marks, and inspection is facilitated to use.Vertical supporting frame 2 is arranged one every 2m, in ripple
It manages and is encrypted at vertical inflection point, accurately to arrange bellows inflection point.
About 2 supporting rack is welded with two layers of horizontal corner steel 21, and pressing web hooping spacing on horizontal corner steel 21 is equipped with cutting,
2 brace side of supporting rack is equipped with draw and insert-type positioning pin stick 22 by web horizontal bar spacing.According to design drawing on bottom plate stirrup
It is required that marking bottom plate main reinforcement binding point, itself and bottom plate stirrup are bound.Web main reinforcement is placed in binding on positioning pin stick,
It is inserted into pin stick 23, as long as " sitting in the right seat " in binding in this way, ensure that the precision and quality of bottom web reinforcement binding.
The positioning pin stick 23 in mould bases is extracted out after the completion of web reinforcement binding, by gantry crane integral hoisting bottom web reinforcement.Mixed
Solidifying earthen platform seat side marks out bellows and puts down curved point, to control bellows horizontal curvature point position.In the side of concrete pedestal
Face should also mark out web and thicken transition fragment position, to control web changeover portion stirrup installation position.
Attached drawing 3 is please referred to, the structure that mould bases is bound the figure shows a kind of roof steel bar provided by the embodiments of the present application is shown
It is intended to.
Optionally, roof steel bar binding mould bases includes top plate mould bases 3 and ear muscle positioning bar 4, and ear muscle positioning bar 4 is uniformly arranged
In the both sides of top plate mould bases 3.The ear muscle positioning bar 4 is inverted U reinforcing bar, and its spacing is just box beam top plate ear muscle spacing.It is pushing up
Slab muscle binds mould bases side, welding top plate ear muscle limit steel bar, it is ensured that ear muscle binding end face is in a straight line.Simultaneously also
Top plate hogging moment steel strand wires end position should be marked with marking pen on mould bases, facilitate location and installation bellows.
Step 4 (S104)：It will bind in molding bottom web reinforcement integral hoisting to box beam side form, and carry out box beam later
The installation of inner template obtains box girder formwork.
After bottom plate and web reinforcement are bound, you can carry out reinforcing bar lifting construction.Bottom web steel is carried out using shoulder pole girder
Muscle lifting construction.The construction method for being entered mould using integral hoisting framework of steel reinforcement is bound compared to traditional in concrete pedestal
The method that reinforcing bar molds again more easily solves the problems such as form joint and template flatness, and can avoid tying up on pedestal
Prick and welded reinforcement and the phenomenon that stay in the welding slag on bottom plate and sundries, influence the presentation quality of box beam.
Optionally, it will bind in molding bottom web reinforcement integral hoisting to box beam side form and include：In the stirrup of web top
Steel pipe is worn, is integrally lifted bottom web reinforcement using shoulder pole girder.Before lifting, steel pipe is worn in the stirrup of web top, by shoulder pole
Beam hook catches on steel pipe, and using gantry crane, integral hoisting binds molding bottom web reinforcement to the box beam that installation is complete of having polished
In side form.Pre-buried beam bottom venthole pvc pipe is required according to design drawing after the completion of lifting, manages interior perfusion sand, both ends adhesive tape
Sealing installs rear and base plate steel bar binding fixation, prevents from shifting deformation in concreting process.
After the completion of the web reinforcement lifting of bottom, Inner Moulding Board in Building is installed.Internal model polishing should be carried out during reinforcing bar is bound
And assembling construction, it is ensured that template surface flatness.Inner Moulding Board in Building piecemeal is lifted into gantry crane after internal model assembly is good, it is interior
Template is fallen in the C50 concrete pads of bottom plate, is fixed by reinforcing bar and exterior sheathing top.Inner Moulding Board in Building bottom is along beam length direction
Elongated to be reserved with 25cm wide open slots, vibrate underplate concrete when facilitating concreting.
Step 5 (S105)：Molding roof steel bar will be bound to lift to box girder formwork, and internal model back-pressure shoulder pole is installed.
Roof steel bar binding requirement is identical as bottom web reinforcement, and the improving bud grafting of point is drawn using cutting, i.e., first on mould bases
Ear muscle is placed by design drawing requirement spacing, marks main reinforcement position to be bound on ear muscle.Palpus in roof steel bar process of binding
Pay attention to binding top plate hogging moment " well " font spacer bar.It should be noted that when template is processed top plate both sides there are comb plate, comb joint,
For fixing top plate ear muscle, notch spacing is ear muscle spacing.Top plate ear muscle must be totally placed on template comb plate, comb joint, and be required
All ear reinforcing bar outer most edges are on same straight line, and grout stop belt is installed on the inside of comb plate, comb joint, prevent from leaking in concreting process
Slurry, that is, reduce waste prevents Concrete contamination construction site again, while using the grout stop belt of pitted skin, waiting for that concrete reaches certain strong
When spending form removal, it is ensured that flange plate side concrete surface is coarse, is handled convenient for dabbing, saves the construction time.
Bellows can be installed after the completion of roof steel bar binding, bellows position is checked after bellows installation, really
It protects bellows installation site and meets design requirement.Concrete pad is bound on reinforcing bar controls thickness of concrete cover, cushion block
In quincuncial arrangement, 4 are no less than per square meter.
Roof steel bar uses self-control truss-like lifting beam to pass through suspension hook Mulit-point Connection with roof steel bar skeleton after constructing
It is lifted by crane, it is ensured that entirety when roof steel bar lifts is firm.After roof steel bar lifting in place, dowel is bound, by top plate steel
Muscle and web reinforcement " latching " shape are integral.
Roof steel bar is after installation is complete, and to prevent during casting concrete, internal model floats, and causes structural deformation, shadow
Box beam quality is rung, lays internal model back-pressure shoulder pole girder at a certain distance above template.Two reinforcing bars are welded below back-pressure shoulder pole girder
Leg, reinforcing bar leg are supported in internal model top, by reverse drawing bar, shoulder pole girder are connect with the vertical upright bar of side form, can avoid pouring coagulation
The problem of internal model floats during soil ensures beam body construction quality.
In addition, top plate hogging moment tensioning slot template prefabricated in advance is put into top plate slot after the completion of case beam steel bar colligation
Interior, it is firm to position and fix, and casting concrete avoids excessive compression preformed groove, ensures that hogging moment tensioning groove location is accurate.
Step 6 (S106)：Bottom board, web and concrete roof, form removal after molding, cross girders body of going forward side by side
Health.
Using oblique segmentation from one end to the other side, horizontal slice, the primary side to top continuous pouring when concreting
Method.Concrete is through 1：1 slope, which is pushed ahead, accomplishes oblique layering, and lift height is not more than 30cm.
Underplate concrete is poured first, should slowly be carried out when pouring underplate concrete, construction personnel enters in box girder inner formwork,
Using internal vibration stick vibrated concrete.Underplate concrete carries out web concrete pouring construction after the completion of pouring, due to case
There are open slots for beam internal model, therefore web concrete is poured and should slowly be carried out, and prevents underplate concrete excessive.Web concrete
It vibrates based on high-frequency attached vibrator, supplemented by poker vibrator.
It answers one-time-concreting to be molded when pouring concrete roof, vibrates based on vibrator as a plug, concrete vibrating is closely knit
Mark be concrete stop sink, effervescent, bleeding, surface be not flat.Special messenger checks template in concreting process
Whether deform, whether reinforcing bar shifts.
The sequence that the dismounting of template follows " first prop up tear open afterwards, rear branch is first torn open " carries out.When beam body concrete strength reaches 2.5MPa
Afterwards, you can remove exterior sheathing.Internal model should could be removed when concrete strength can guarantee that its surface does not generate crack phenomenon.Mould
After plate removes, template surface remnants mortar and uniform oiling should be removed in time, it is spare after trimming, and the wet seam crossing of dabbing is mixed in time
Solidifying soil.
Full wafer beam carries out health in time after the completion of pouring.The concrete curing time is not less than 7 days.Web is supported using spray
Raw, spray header sets a nozzle every 2m, and both sides water pipe spout is oblique upward.Case inner bottom plating health uses water storage health,
Box beam both ends build 24cm or so height waterwalls by laying bricks or stones with square brick, puzzle joint clogged with mortar it is closely knit, in chamber water storage 20cm into
Row health.Top plate is carried out using covering geotextiles spray moisturizing mode, after each spraying health promotion, in box beam side concrete
Upper laying plastic film continues wet curing.
Step 7 (S107)：Tensioning, mud jacking, sealing off and covering anchorage processing are carried out after health, obtain prefabricated case beam.
Tensioning uses intelligent tensioning equipment tensioning.The method that stretching process uses stretch value and stretching control force dual control, really
Protect tensioning quality.Single cycle Intelligent mud jacking equipment is used to carry out hole path pressure grouting in the embodiment of the present application.
Sealing off and covering anchorage template is installed using set shaped steel formwork, and sealing end template should fix accurately, and beam length, length should be checked after formwork erection
Regulation should be met.End head formwork will consider the influence of longitudinal slope simultaneously, so as to seal end face vertical after installation is in place.When sealing off and covering anchorage, strictly
Control beam slab length, it is ensured that expansion joint width.End carriage expansion joint embedded bar position, height, angle will meet design requirement, protect
Demonstrate,prove expansion joint and embedded bar good connection, formwork erection is secured, it is indeformable, do not run mould.
In the construction of prefabricated case beam, concrete pedestal is made in precasting yard, and external mold is installed in the concrete pedestal
Plate obtains box beam side form.In addition it makes bottom web reinforcement binding mould bases and roof steel bar binds mould bases, and carried out on the mould bases
The binding of reinforcing bar is once lifted it to box beam side form using shoulder pole girder after the binding molding of bottom web reinforcement, then installs case
The inner template of beam, obtains box girder formwork.Molding roof steel bar will then be bound to be lifted on the box girder formwork, and internal model is installed
Back-pressure shoulder pole.Concrete reach scene after, carry out bottom plate, web and concrete roof cast, after molding can form removal,
The health of beam body is carried out, after the laggard cross girders body tensioning of health, mud jacking, sealing off and covering anchorage processing, you can obtain prefabricated case beam.
Optionally, it is carried out at the same time the step of exterior sheathing is installed in concrete pedestal, and makes bottom web reinforcement respectively and tie up
Prick mould bases and roof steel bar binding mould bases and the step of carry out the binding of reinforcing bar, i.e., above-mentioned S102 and S103 steps can simultaneously into
Row.Due to being bound on dedicated mould bases for bottom web reinforcement and roof steel bar, and external mold is assembled in concrete pedestal, therefore
On one side while assembling reinforcement on mould bases, the assembly of external mold can be in addition carried out at precast beam pedestal.With existing precast box
Girder construction process needs the assembling reinforcement on precast beam pedestal first, after external mold be installed on it compare, reinforcing bar binding is spelled with external mold
It is carried out while dress, can effectively accelerate the progress of construction, improve construction efficiency.
Optionally, making concrete pedestal includes：The pre-buried channel steel in both sides at the top of concrete pedestal, and be arranged in channel steel
Sebific duct.It in molding, is had the gap between side form and precast beam pedestal, when casting concrete easily stays slurry, is not easy to ensure presentation quality.
And in the pre-buried channel steel in concrete pedestal both sides, flexible plastic sebific duct is installed in channel steel, by squeezing sebific duct when molding, platform can be blocked
Seat side and side form gap, avoid spillage, advantageously ensure that the presentation quality of precast beam pedestal.
The application provides a kind of construction method of prefabricated case beam, using binding bottom web reinforcement and top on dedicated mould bases
Slab muscle installs exterior sheathing on precast beam pedestal, will bind later in the integral hoisting to template of molding framework of steel reinforcement
Construction method.Compared with existing Constructional Technology in Pre-made Bridge, when exterior sheathing is mounted on precast beam pedestal, inside template not
Reinforcing bar is installed, there are enough spaces to carry out the adjustment processing of template seam, improves the appearance for pouring rear exterior sheathing and installation matter
Amount, and then improve the presentation quality of box beam.Reinforcing bar binds installation on dedicated mould bases, helps to improve reinforcing bar binding quality,
And reinforcing bar binding is not happened on precast beam pedestal, can avoid welding slag, sundries etc. fall on precast beam pedestal and after reducing and pouring
The problem of flooring look quality, helps to improve the presentation quality of box beam.In addition, the installation of external mold and mould bases on precast beam pedestal
The binding of upper reinforcing bar can be carried out at the same time, and effectively raise the construction efficiency of prefabricated case beam.A kind of avoidable welding slag or miscellaneous is provided
Object falls into phenomena such as precast beam pedestal and exterior sheathing seam and not disposable flatness, effectively improves prefabricated case beam appearance matter
Amount, the Construction of Precast Box Beam method of lifting construction efficiency.
It should be noted that such as the terms "include", "comprise" or its any other variant are intended to nonexcludability
Include but also include not bright so that article or equipment including a series of elements include not only those elements
The other element really listed, or further include for elements inherent to such a process, method, article, or device.Do not having
In the case of more limitations, the element that is limited by sentence "including a ...", it is not excluded that including the element process,
There is also other identical elements in method, article or equipment.
The above is only the specific implementation mode of the application, is made skilled artisans appreciate that or realizing this Shen
Please.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or range.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
It should be understood that the application is not limited to the content for being described above and being shown in the accompanying drawings, and can
To carry out various modifications and change without departing from the scope.Scope of the present application is only limited by the accompanying claims.
Claims (7)
1. a kind of construction method of prefabricated case beam, which is characterized in that the construction method includes the following steps：
Make concrete pedestal；
Exterior sheathing is installed in the concrete pedestal, obtains box beam side form；
Bottom web reinforcement binding mould bases and roof steel bar binding mould bases and the binding for carrying out reinforcing bar are made respectively；
It will bind in molding bottom web reinforcement integral hoisting to the box beam side form, and carry out the installation of Inner Moulding Board in Building later,
Obtain box girder formwork；
Molding roof steel bar will be bound to lift to the box girder formwork, and internal model back-pressure shoulder pole is installed；
Bottom board, web and concrete roof, form removal after molding, the health for cross girders body of going forward side by side；
Tensioning, mud jacking, sealing off and covering anchorage processing are carried out after health, obtain the prefabricated case beam.
2. the construction method of prefabricated case beam according to claim 1, which is characterized in that be carried out at the same time described in the coagulation
The step of installing exterior sheathing on the seat of earthen platform and the bottom web reinforcement that makes respectively bind mould bases and roof steel bar binding mould bases simultaneously
The step of carrying out the binding of reinforcing bar.
3. the construction method of prefabricated case beam according to claim 1, which is characterized in that the bottom web reinforcement binds mould bases
Mould bases ontology including transverse direction is set to the vertical triangle support frame on the mould bases ontology with several；
Support frame as described above is welded with two layers of horizontal corner steel up and down, and pressing web hooping spacing on the horizontal corner steel is equipped with cutting, institute
It states supporting rack brace side and is equipped with draw and insert-type positioning pin stick by web horizontal bar spacing.
4. the construction method of prefabricated case beam according to claim 1, which is characterized in that the roof steel bar binds mould bases packet
Top plate mould bases and ear muscle positioning bar are included, the ear muscle positioning bar is uniformly arranged on the both sides of the top plate mould bases.
5. the construction method of prefabricated case beam according to claim 1, which is characterized in that the making concrete pedestal packet
It includes：The pre-buried channel steel in both sides at the top of the concrete pedestal, and sebific duct is set in the channel steel.
6. the construction method of prefabricated case beam according to claim 1, which is characterized in that described in the concrete pedestal
Installing exterior sheathing includes：The exterior sheathing is lifted to pedestal, adjustable bottom is installed at the exterior sheathing back vertical supporting bottom
After tentatively fixing the exterior sheathing, the adjusting of exterior sheathing is carried out by horizon rule for support.
7. the construction method of prefabricated case beam according to claim 1, which is characterized in that described to bind molding bottom web
Include in reinforcing bar integral hoisting to the box beam side form：Steel pipe is worn in the stirrup of web top, using shoulder pole girder by the bottom web
Reinforcing bar is integrally lifted.
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| CN109571748A (en) * | 2018-11-30 | 2019-04-05 | 中铁八局集团桥梁工程有限责任公司 | The manufacturing method of concrete prefabricated pipe gallery |
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| CN110653918A (en) * | 2019-09-26 | 2020-01-07 | 中交一公局第六工程有限公司 | Construction method for synchronously pouring large-span corrugated steel inclined web precast beam with toothed block on top and bottom plates by post-tensioning method |
| CN110653918B (en) * | 2019-09-26 | 2021-08-10 | 中交一公局第六工程有限公司 | Construction method for synchronously pouring large-span corrugated steel inclined web precast beam with toothed block on top and bottom plates by post-tensioning method |
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| CN112376351A (en) * | 2020-11-03 | 2021-02-19 | 中国电建集团重庆工程有限公司 | Construction method of prefabricated beam road related to mountain knife back beam terrain |
| CN112873487A (en) * | 2021-01-20 | 2021-06-01 | 广东预立预制构件有限公司 | Production method of T-shaped beam, small box beam and segment piece heavy prefabricated part |
| CN113001753A (en) * | 2021-03-10 | 2021-06-22 | 中铁二十局集团第六工程有限公司 | Intelligent box girder prefabricating method |
| CN113696302A (en) * | 2021-08-31 | 2021-11-26 | 中交路桥建设有限公司 | Construction method for changing prefabricated T beam into multi-span prefabricated box beam pedestal |
| CN114953168A (en) * | 2022-06-14 | 2022-08-30 | 保利长大工程有限公司 | Construction method for solving crack generated by small box girder end tensioning prestress |
| CN115446974A (en) * | 2022-09-13 | 2022-12-09 | 山东高速德建集团有限公司 | Diamond-section concrete super-heavy beam side support frame and using method thereof |
| CN115556231A (en) * | 2022-09-27 | 2023-01-03 | 中交四航局第一工程有限公司 | Construction method for standardized, informatization and industrial prefabricated box girder |
| CN116330463A (en) * | 2023-03-27 | 2023-06-27 | 宿迁市高速铁路建设发展有限公司 | Production process of bridge prefabricated part |
| CN116330463B (en) * | 2023-03-27 | 2023-10-24 | 宿迁市高速铁路建设发展有限公司 | Production process of bridge prefabricated part |
| CN116352872A (en) * | 2023-03-30 | 2023-06-30 | 中铁三局集团有限公司 | A method for manufacturing a large-span inverted siphon bridge assembled arch box |
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Application publication date: 20181012 |