CN104727226A - Construction method for steel-concrete composite girder - Google Patents
Construction method for steel-concrete composite girder Download PDFInfo
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- CN104727226A CN104727226A CN201510081269.1A CN201510081269A CN104727226A CN 104727226 A CN104727226 A CN 104727226A CN 201510081269 A CN201510081269 A CN 201510081269A CN 104727226 A CN104727226 A CN 104727226A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
Abstract
The invention discloses a construction method for a steel-concrete composite girder segment. The method comprises the steps that 1, the steel-concrete composite girder segment is manufactured in a factory; 2, a deck derrick crane is assembled on site to be in place and adjusted, meanwhile, the steel-concrete composite girder is transported to a construction site from the factory; 3, the steel-concrete composite girder segment is vertically prefabricated; 4, a hoisting operation is conducted on the steel-concrete composite girder; 5, a stiff skeleton is installed; the steel-concrete composite girder is fixed to built-in fittings on a suspension poured concrete box girder in a welded mode through structural steel; 6, closure segment construction is conducted; closure segment reinforced steel colligation, formwork installation, pre-stressed tendon installation and closure segment concrete pouring construction between the steel-concrete composite girder and the concrete box girder are conducted; 7, bridge girder pre-stress construction is conducted; when closure segment concrete reaches the design strength, steel-concrete composite girder pre-stress tensioning and mud jacking are conducted, and the deck derrick crane and steel-concrete composite girder constraints are removed. The construction method for the steel-concrete composite girder can not only guarantee the construction quality, but also can save the cost and shorten the construction period.
Description
Technical field:
The present invention relates to field of bridge construction, particularly relate to a kind of steel-concrete connecting beam section constructing method.
Background technology:
Steel-concrete hybrid beam can give full play to steel work and concrete supporting capacity, weight difference to change multispan bridge across footpath ratio.Steel-concrete the adapter section of usual rigid frame bridge is positioned at main span about 1/3 beam segment length position, and three sections, girder steel (the two basic change section girder steel be combined with two ends concrete beam, the middle large sections girder steel be connected with two adapter section girder steels), adapter section girder steel and large sections girder steel are lifted by crane by the erection crane be fixed on bridge floor.Adapter section girder steel is connected by the concrete stretched in girder steel with concrete beam, and adapter section girder steel and large sections girder steel are by weld or bolt is connected.
Usually large sections girder steel and the long line manufacture inside of adapter section girder steel, adapter section steel beam lifting also lifts large sections girder steel again after concreting, deviation is there is in adapter section girder steel in hoisting process, and adapter section girder steel and large sections girder steel are due to its special Joining Technology (welding or bolt), require that two adapter section steel girder erection precision are high especially.
Utilize steel plate to be provided with in usual adapter section girder steel much narrow and small box, the concrete in girder steel is built in position after adapter section steel beam lifting is in place, and concrete horizontal flowing is full of whole box, vibrates for laterally vibrating.When building girder steel inner concrete in position, concrete is difficult to dense packing effect each narrow and small case room to girder steel under bottom horizontal flow sheet state, and concrete placings difficult quality guarantee, has a strong impact on the construction quality of toughened internal stress.
In sum, be necessary the construction method that a kind of steel-concrete connecting beam is provided, solve the installation accuracy of adapter section girder steel, the particularly relative tertiary location of two adapter section girder steels, and the problem of the construction quality of adapter section inner concrete.
Summary of the invention:
The present invention is that the adapter section concrete construction of steel-concrete connecting beam section and the integral installation of steel-concrete connecting beam section provide one method safely and effectively, can ensure that construction quality is stablized superior, construction cost, late maintaining cost can be saved again, and can construction period be shortened.
1. a construction method for steel-concrete connecting beam section, is characterized in that, comprises the following steps:
One) make in steel-concrete connecting beam section factory;
Two) erection crane on-site consolidation in place, debugging, be meanwhile transported to job site in steel-concrete connecting beam factory;
Three) steel-concrete connecting beam section concrete is vertically prefabricated;
Steel-concrete connecting beam section is vertically placed, and carries out the reinforcing bar binding of girder steel and concrete beam adapter section, model sheetinstallat, the vertical pouring construction of concrete;
Four) steel-concrete connecting beam lifting operation;
Haulage device is located under steel-concrete connecting beam being transported to bridge, utilize and bondbeam section stands up hanger, erection crane promote bondbeam section aloft aerial 90 degree of bondbeam stand up work, and again transfer to haulage device, suspender on erection crane is converted on the lifting hanger in bondbeam section, normal hoisting steel-concrete connecting beam is to design height again, is completed the accurate adjustment of steel-concrete connecting beam aerial statue by the three-dimensional regulating system of erection crane;
Five) stiff skeleton is installed;
With shaped steel, the built-in fitting on the concrete box girder of steel-concrete connecting beam and cantilever is welded and fixed;
Six) closure segment construction;
Closure segment reinforcing bar binding between steel-concrete connecting beam and concrete box girder, installation form, prestressed muscle, build closure segment concrete construction;
Seven) bridge prestress construction;
After closure segment concrete reaches design strength, carry out steel-concrete connecting beam prestressed stretch-draw, mud jacking, dismounting erection crane and steel-concrete connecting beam retrain.
In described step 3) in, vertically placed by the girder steel of factory process, and need concreting one end upward, adapter section concrete is vertical layered builds, vertical layeredly to vibrate.
In described step 4) in, steel-concrete connecting beam Duan Shangyou specializes in the hanger standing up, normally lift by crane, bondbeam section overall erection crane auxiliary under aloft complete 90 degree stand up work, transfer after bondbeam section air turning on haulage device, bondbeam section is normally lifted by crane with the Special lifting lug on it, and erection crane three-dimensional regulating system completes the aerial statue accurate adjustment of bondbeam section.
The advantage that the present invention has and good effect are: adopt adapter section concrete vertically prefabricated and concrete surface higher than steel work 50cm; can ensure that concrete is filled in each narrow and small case room in girder steel fully under Gravitative Loads; vertical layered vibrate can guarantee concrete fully closely knit; the level of solving to build under state gas in concrete cannot get rid of the difficult problem causing there is the gap that gas is filled between concrete and steel room, for steel-concrete adapter section concrete construction quality provides guarantee.Utilize erection crane to carry out air turning to steel-concrete connecting beam section, the use of extra big machinery can be avoided, reduce construction cost.By the three-dimensional regulating system on erection crane, accurate adjustment can be carried out to the spatial attitude of steel-concrete connecting beam section, can guarantee that large sections girder steel docks with two the accurate of steel-concrete connecting beam section, ensure quality of finished bridge.
Accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the schematic diagram that the present invention applies.
In figure: 1, steel-concrete connecting beam, 2, erection crane, 3, haulage device, 4, cantilever case beam, 5, closure segment, 6, continuous jack, 7, steel strand, 8, hanger, 9, regulate oil cylinder
Fig. 2 is construction technology main-process stream of the present invention
detailed description of the invention:
For summary of the invention of the present invention, feature level work efficiency can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1, a kind of steel-concrete connecting beam section construction technology, the technological process of this construction technology comprises:
Steel-concrete connecting beam section making → erection crane is assembled, the vertically prefabricated → steel-concrete connecting beam lifting → stiff skeleton installation → closure segment construction → bridge prestress construction of steel-concrete connecting beam transport → steel-concrete connecting beam section.
This construction technology comprises the following steps:
One) steel-concrete connecting beam section makes
Steel-concrete connecting beam section is entrusted professional steel work producer according to design drawing processing, is made shaping, and arranges technician's supervision in field.
Two) erection crane assembled, steel-concrete connecting beam transport
Erection crane is primarily of load-carrying members and Hoisting System two parts composition.Load-carrying members adopt trussed construction, and an erection crane is made up of two groups of identical triangular truss structures of structure and lateral ties truss.Often organize triangular truss to be made up of some I-steel components, all components are connected at node by high-strength bolt.Hoisting System adopts continuous jack and synchronization lifting system.
According to geographical conditions, the transport of steel-concrete connecting beam section adopts water transport to bridge location.
Three) steel-concrete connecting beam concrete is vertically prefabricated
For avoiding conventional construction method concrete to be difficult to dense packing effect each narrow and small case room to girder steel under bottom horizontal flow sheet state, the problem of concrete placings difficult quality guarantee, the method that this engineering adopts steel-concrete connecting beam concrete vertically prefabricated.
Adopt during precast reinforced concrete adapter section and place state vertically, namely the end face be connected with steel box-girder and earth surface, concrete segment is positioned at top, carry out reinforcing bar binding, template support, concreting, during fluid concrete under gravity concrete can automatic filling to each corner of adapter section steel-structure box room, and gas can vertically be got rid of in concrete, thus ensure that the concrete casting quality of adapter section.The overhanging steel work 50cm of precast concrete, to ensure follow-up closure segment and steel-concrete connecting beam section quality of connection.
Four) steel-concrete connecting beam section lifting
Haulage device is located under steel-concrete connecting beam being transported to bridge, install in the slack tide period and bondbeam section stands up hanger, erection crane promotes bondbeam section, after promoting certain altitude, front suspension centre progressively falls after rise, and steel-concrete connecting beam starts to tilt, leveling gradually, complete aerial 90 degree of steel-concrete connecting beam section and stand up work, and again transfer to haulage device.
Erection crane suspender is converted on the lifting hanger of bondbeam, and normal hoisting bondbeam, to design height, completes the accurate adjustment of steel-concrete connecting beam aerial statue by the three-dimensional regulating system of erection crane.
Five) stiff skeleton is installed
After steel-concrete connecting beam completes the adjustment of aerial statue, with shaped steel, the built-in fitting on the concrete box girder of steel-concrete connecting beam and cantilever is welded and fixed.
Six) closure segment construction
Concrete cantilever beam section sets up interim suspension bracket, interim suspension bracket sets up cast-in-situ concrete exterior sheathing, processing assembling reinforcement, the preparations such as arrangement prestress pipeline; Install internal mold, colligation connects roof steel bar, prestress pipe etc., concreting maintenance.
Seven) bridge prestress construction
This is not repeating for common process.
Construction technology process is shown in Fig. 2 more specifically.
Key points for operation
(1) preparation of construction
A, do the expense plan of good material, equipment, plan is carried out purchasing and carries out quality examination work of marching into the arena as required;
B, carry out constructor and divide the work to arrange, and carry out detailed security, confide a technological secret;
C, carry out the calibration operation of measuring apparatus, repetition measurement is carried out to SURVEYING CONTROL NETWORK;
D, lift by crane first 2 days, Continuous Observation is carried out to cantilever end concrete beam end face;
E, carry out the communication and coordination with departments such as maritime affairs, issue iceound bulletin in advance.
(2) erection crane system is installed
Erection crane system is formed by a large amount of primary structural component spelling, can adopt the mounting method that in the assembled or field of original position on bridge, assembled integral hoisting is in place, specific requirement following points in installation time assembled:
A, note the numbering of each component, avoid using with, install in strict accordance with installation drawing numbering;
B, to have in hoisting process the surface needing relative sliding carry out antirust, lubrication, and ensure surface cleaning;
C, when installing hoist cable, positive and negatively revolve each half of steel strand, on ground tackle, each circle steel strand needs positive and negative revolving alternately to arrange;
After d, structure installment, the bolt that need connect component, bearing pin check, bolt is executed to twist and strictly undertaken by code requirement.
(3) adapter section concrete is prefabricated
When adapter section concrete is prefabricated, vertically laid by adapter section steel work (wet joint end upward), assembling reinforcement, installation form build concrete, concrete overhanging steel work end face 50cm is advisable.
When concrete placings, note vibrating to the narrow case room in steel work, ensure that concrete dense packing effect is at each position of steel work, gives full play to its power transmission effect.
(4) cargo ship casts anchor location
Steel-concrete adapter section adopts barging, locates during lifting perpendicular to bridge route direction.
The positioning step that casts anchor is as follows:
A, near the given area of end bay, throw lower horizontal positioning anchor;
B, ship meet water and flow the anchor chain in bow direction under throwing in given area;
C, veer, barge drifts dynamic downstream, after barge moves to given area, throws the anchor chain in lower stern direction;
D, tighten up the hawser of bow anchor, loosen stern hawser, make barge complete Primary Location;
E, with the suspender of transferring in advance for reference, by adjusting the hawser of 3 anchors, make barge complete accurate location, required precision 1m.
Cargo ship casts anchor and locates specific requirement following points:
A, cast anchor before, check that the shackle that is connected with wire rope of anchor is with or without damage, have infringement must prior replacing;
B, cast anchor before, check wire rope have impulse-free robustness, fracture of wire phenomenon; If any, must change;
C, when casting anchor, with the plan-position of boat-carrying GPS or measurement GPS positioning anchor, need ensure that anchor has enough grips;
Before d, lifting, the relative position of the suspender that moment concern adapter section hanger and erection crane are transferred, and deviation both being ensured by adjustment is in time within the scope of 1m;
(5) turnover lifting appliance is installed
Suspender and adapter section hanger are pin joint, install to adopt and manually carry out, mounting limit steel plate after bearing pin installation in position.
Suspender install specifically require following some:
Before a, installation, to hanger, bearing pin and suspender coating lubricating oil, the burr on hanger and suspender need be removed, ensure that suspender is installed smoothly;
B, when installing, must ensure steel strand install after vertically, vertically without spin, wrapping phenomena;
When c, installation, need carry out under steel strand relaxed state, and complete the installation of whole suspender fast, the situation of change of moment concern water level, ensure that reason water level reduces and make part suspension centre stressed;
(6) adapter section lifting, air turning
Steel-concrete adapter section elevating mechanism is be arranged on the erection crane on box girder cantilever end, promote power to be provided by hydraulic continuous jack, two sides Hoisting System is controlled by a turn-key system, the internal force of each jack and stroke in real-time monitoring system, and when suspending certain part jack by general control system, other jack stroke is arbitrarily adjusted, realize the uniform stressed of jack.
Adapter section promotes, air turning step is as follows:
Before a, lifting, check suspension centre and suspender
Whether the constraint of the plan-position of b, connection, cargo ship and adapter section and cargo ship is removed;
Computer control system is utilized to carry out hierarchical loading (divide three grades, load added by every grade is 20%, 50%, 80% of adapter section theoretical weight) to adapter section.Often loading one-level need stop loading and inspecting components such as suspension centre, suspender and erection cranes, inspecting by then carrying out next procedure, inspect not by the analysis of causes need be carried out in time, next procedure can be carried out after solution removes;
A, utilize computer control system to promote adapter section, until when leaving cargo ship 0.5m bottom adapter section, stop promoting and also the components such as suspension centre, suspender and erection crane are inspected;
B, computer control system is utilized to carry out leveling to adapter section; The actual loading checking each jack whether its theoretical load ± 10% within, should, according to assay, determine to carry out promoting or adapter section being transferred on cargo ship;
C, computer control system is set to automatic lifting pattern, automatic synchronization promotes adapter section, until hoisting depth meets air turning requirement;
D, time-out 2, front end jack, be adjusted to lower mode playback by rear end two jack, realize adapter section with front end two hanger for the center of circle overturns, until adapter section top board level;
E, 4 jack are all adjusted to lower mode playback, entirety transfers adapter section;
D, adjustment plan-position, and on commitment positions, lay temporary steel buttress, be put on steel buttress under adapter section;
E, continue to transfer hoist cable, until it obviously relaxes, remove suspender fast and stand up the direct bearing pin of hanger.
Adapter section promotes, air turning specific requirement following points:
Before f, lifting, reply is stood up the influential reinforcing bar of process, bellows etc. and is processed, and avoids having an impact to the process of standing up;
In g, lifting and decentralization process, note the observation to adapter section end face levelness, as injustice, need to suspend in time lifting and to go forward side by side Row sum-equal matrix;
H, temporary steel buttress install after, need check its stationarity, ensure stressed after stability;
Adapter section falls within after on steel buttress, can remove, and accomplish synchronous dismounting as far as possible after need continuing to transfer hoist cable to obvious relaxed state to hanger bearing pin.
(7) stand up hanger to cut off
Consider lifting in place after cut off on base plate to stand up hanger more difficult, stood up fall within temporary rest pier after namely carry out standing up cutting off of hanger.
Stand up hanger and cut off specific requirement following points:
A, stand up the leg place line of hanger at base plate, using this line as cutting off sideline;
When b, hanger cut off, note the protection to manifold section steel work, avoid producing steel work destroying.
(8) hoisting sling is installed
Suspender is installed with reference to 5)
(9) adapter section promotes
Adapter section lifting step is as follows:
Before a, lifting, check suspension centre and the connection of suspender, the plan-position of cargo ship;
B, computer control system is utilized to carry out hierarchical loading (point three grades, load added by every grade is 20%, 50%, 80% of adapter section theoretical weight) to adapter section.Often loading one-level need stop loading and inspecting components such as suspension centre, suspender and erection cranes, inspecting by then carrying out next procedure, inspect not by the analysis of causes need be carried out in time, next procedure can be carried out after solution removes;
C, utilize computer control system to promote adapter section, until when leaving cargo ship 0.5m bottom adapter section, stop promoting and also the components such as suspension centre, suspender and erection crane are inspected;
D, computer control system is utilized to carry out leveling to adapter section; The actual loading checking each jack whether its theoretical load ± 10% within, should, according to assay, determine to carry out promoting or adapter section being transferred on cargo ship;
E, computer control system is set to automatic lifting pattern, automatic synchronization promotes adapter section to commitment positions.
Adapter section promotes specific requirement following points:
Before f, lifting, reply suspender connects and erection crane system checks;
In g, lifting process, the observation to adapter section end face levelness should be noted, as injustice, need to suspend in time lifting and to go forward side by side Row sum-equal matrix;
(10) adapter section is accurately located
The accurate location of adapter section, can the positioning precision of especially closing up port with large sections steel box-girder determine large sections steel box-girder and close up and close up quality.As two basic change section port Reversal value, what large sections steel box-girder reflected is exactly the synergistic effect of a deviation.So large sections steel box-girder closes up the positioning precision that precision depends on two basic change section completely.By in-site measurement, observation data is fed back to Hoisting System control room during location, system operators is by adjustment 4 vertical lifting jack and longitudinal and transversely move system, realizes the accurate location of adapter section.
Adapter section accurately locates specific requirement following points:
Before the lifting of a, adapter section, at least should carry out Continuous Observation to two cantilever end case beams, find out the situation of change of its temperature influence;
When b, adapter section locus calculate, the various factors that reply affects spatial attitude is considered complete, as temperature, lifting time, structural load etc.;
C, the protection noting observation point on adapter section, avoid destroying observation point, cause completing accurate location.
(11) adapter section temporary consolidation
After adapter section has accurately been located, install temporary consolidation component by bridge design requirement, the connection of temporary consolidation component and adapter section and cantilever end case beam must be reliable.
(12) wet joint construction
Wet joint employing is hung modulus method and is constructed.
Wet joint construction sequence is as follows:
A, installation external mold, and by essence bundle indented bars, external mold is anchored on adapter section and cantilever end case beam;
B, install at the bottom of wet joint section, web reinforcement and pre-stress system;
C, installation internal mold, colligation roof steel bar, concreting;
D, concrete health, carry out stretch-draw and the mud jacking of pre-stress system, and stripping system.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (2)
1. a construction method for steel-concrete connecting beam section, is characterized in that, comprises the following steps:
One) make in steel-concrete connecting beam section factory
Two) erection crane on-site consolidation in place, debugging, be meanwhile transported to job site in steel-concrete connecting beam factory;
Three) steel-concrete connecting beam section concrete is vertically prefabricated
Steel-concrete connecting beam section is vertically placed, and carries out the reinforcing bar binding of girder steel and concrete beam adapter section, model sheetinstallat, the vertical pouring construction of concrete;
Four) steel-concrete connecting beam lifting operation
Haulage device is located under steel-concrete connecting beam being transported to bridge, utilize and bondbeam section stands up hanger, erection crane promote bondbeam section aloft aerial 90 degree of bondbeam stand up work, and again transfer to haulage device, suspender on erection crane is converted on the lifting hanger in bondbeam section, normal hoisting steel-concrete connecting beam is to design height again, is completed the accurate adjustment of steel-concrete connecting beam aerial statue by the three-dimensional regulating system of erection crane;
Five) stiff skeleton is installed
With shaped steel, the built-in fitting on the concrete box girder of steel-concrete connecting beam and cantilever is welded and fixed;
Six) closure segment construction
Closure segment reinforcing bar binding between steel-concrete connecting beam and concrete box girder, installation form, prestressed muscle, build closure segment concrete construction;
Seven) bridge prestress construction
After closure segment concrete reaches design strength, carry out steel-concrete connecting beam prestressed stretch-draw, mud jacking, dismounting erection crane and steel-concrete connecting beam retrain.
2. the construction method of steel-concrete connecting beam section according to claim 1, it is characterized in that, in described step 3) in, vertically placed by the girder steel of factory process, and needing concreting one end upward, adapter section concrete is vertical layered builds, vertical layeredly vibrate.
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