CN102912738B - Overall prepressing device for hanging basket - Google Patents
Overall prepressing device for hanging basket Download PDFInfo
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- CN102912738B CN102912738B CN201210442559.0A CN201210442559A CN102912738B CN 102912738 B CN102912738 B CN 102912738B CN 201210442559 A CN201210442559 A CN 201210442559A CN 102912738 B CN102912738 B CN 102912738B
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Abstract
The invention provides an overall prepressing device for a hanging basket. The overall prepressing device comprises a loading system and a connection system, wherein the loading system is arranged on the lower part of the hanging basket; when the loading system applies a load, the connection system is used for transmitting the load to the structure on the upper part of the hanging basket, so that the overall hanging basket is stressed; the connection system comprises a distribution beam and a connection hanging rod; the distribution beam comprises an upper distribution beam and a lower distribution beam; the upper distribution beam is positioned on a sliding beam of the hanging basket; the lower distribution beam is positioned on a bottom basket longitudinal beam of the hanging basket; and the connection hanging rod is connected with the upper distribution beam and the lower distribution beam. With the adoption of the device, prepressing of the hanging basket structure can accord with the actual stress situation.
Description
Technical field
The present invention relates to a kind of Hanging Basket whole prepressing device, the particularly whole prepressing device of a kind of high pier Hanging Basket.
Background technology
Hanging Basket precompressed refers at the bridge that adopts cantilever casting construction, start before the construction of 1# piece, construction simulation load case, the Hanging Basket being arranged on 0# piece is carried out to precompressed, intensity, rigidity and the stability of checking cradle structure, eliminate the nonlinear deformation of structure simultaneously, draw the elastic deformation of structure, as the foundation of formwork erection absolute altitude.
Hanging Basket precompressed is a requisite process in cantilever bridge construction.Yet along with the development of highway communication industry, pier stud height constantly increases, some bridge pier column height is over hundred meters now.In the face of high pier stud like this, the precompressed of Hanging Basket is very difficult; Precompressed simultaneously as far as possible construction simulation actual conditions loads, if be not inconsistent with actual conditions, can not reach the object of precompressed, can increase on the contrary the risk of construction.Therefore, select correct preloading method very important.
Existing Hanging Basket preloading method has a variety of, and conventional have preloading, cofferdam preloading, jack tension preloading and a reaction frame pre-pressing method.
Preloading utilizes the material of sand pocket or reinforcing bar as load, according to actual loading, is distributed in preloading in collet system.It is not high that the method is applicable to pier stud, and site traffic is convenient, the area of material abundance.The shortcoming of the method is: pack, weigh, the operation labour intensity such as lifting, dismounting are large; Long construction period; As the rainy day, sand pocket weight will not be inconsistent with actual loading.
Cofferdam precompressed is to utilize Hanging Basket collet system and web external mold as the end, the sidewall of water tank, carries out the sealing between template, and then water filling loads.The advantage of the method is that loading, discharging method are simple, and accurately, easily controls.Shortcoming is that water tank height has surpassed root deck-molding, and water tank lateral pressure is quite large; Water tank height is very large, very high to the rigidity requirement of the sealing of water tank and water tank sidewall; The during welding for steel structure amount of sidewall is large simultaneously, dangerous large, long construction period.
Jack precompressed refers on having constructed complete cushion cap early stage anchor point is set, by steel strand, anchor point is connected with end basket longeron, stretch-draw in collet system, by force reaction in cradle structure, reach the object of loading, the method can be used existing tensioning equipment, simple and convenient, and labour intensity is low, the cycle is short.But want to use the method more accurately to simulate actual loading situation, need the anchor point buried underground more, and pier stud is when higher, is subject to Wind effects large.
Reaction frame pre-pressing method is, on 0# piece two coxostermums of having constructed, tripod is set, and between tripod and end basket longeron, jack is set, and when jack applied elongation, reaction frame reacts on load on end basket longeron, reaches the object to structure precompressed.The method easy construction, quick, does not need to drop into more material and facility, is widely used in bridge construction.But the method is had relatively high expectations to the strength and stiffness of reaction frame, otherwise, can not reach the object of precompressed.
Although latter two method is practical, also there is obviously deficiency, during precompressed, all only on end basket longeron, load, ignored the load on inside and outside sliding beam top.And in practice of construction process, the load of sliding joist support load is about 30% left and right of total load.During precompressed, if this part load is all applied on end basket, and replace evenly distributed load with single-point point load, the destruction that very easily causes end basket, causes security incident.
For accurate simulation Hanging Basket actual loading situation, realize the whole precompressed of Hanging Basket, the existing practice has on the front suspension rod that connects nose girder or sliding beam and hangs weight, reaches the object of load application.Yet the method still has operation trouble, long construction period, hoisting difficulty is large, is subject to the shortcomings such as Wind effects is large.
Summary of the invention
The whole prepressing device of Hanging Basket provided by the invention is by linkage being set between end basket longeron and sliding beam or nose girder, rationally adjust the rigidity of connecting rod, reach on end basket and load, whole stressed object, makes the more realistic force-bearing situation of cradle structure precompressed.
This device comprises: loading system and connected system, and described loading system is arranged on the bottom of described Hanging Basket, and when loading system load application, connected system, for load is passed to Hanging Basket superstructure, makes Hanging Basket integral body stressed.
Described connected system comprises distribution beam and is connected suspension rod, described distribution beam comprises distribution beam and lower distribution beam, described upper distribution beam is positioned on the sliding beam of described Hanging Basket, described lower distribution beam is positioned on the end basket longeron of described Hanging Basket, and described connection suspension rod connects described upper distribution beam and described lower distribution beam.
This device also comprises reaction frame system, for supporting described loading system.Described upper distribution beam is arranged on 1/4 and 3/4 position of described sliding beam, and described lower distribution beam is arranged on 1/4 and 3/4 position of basket longeron of the described end.
Described reaction frame system comprises built-in fitting, horizon bar, brace and cross bar, and described built-in fitting comprises built-in fitting and lower built-in fitting, and described cross bar arranges along bridge lateral, and with described lower built-in fitting in same level; Described horizon bar longitudinally arranges along bridge, and its two ends are connected with described cross bar with described lower built-in fitting respectively; One end of described brace is connected to described upper built-in fitting, and the other end is connected with described cross bar.
Described loading system comprises executing carries member and loads longeron, described in execute and carry a member and be arranged on described loading longeron and by described reaction frame system support, described loading longeron is positioned at the top of described lower distribution beam.
Accompanying drawing explanation
Fig. 1 is while seeing from bridge one side, the schematic diagram of the whole prepressing device of Hanging Basket of a specific embodiment of the present invention;
Fig. 2 is while seeing from bridge one side, is provided with the schematic diagram of the whole prepressing device of Hanging Basket of reaction frame system;
Fig. 3 is while facing bridge construction face, the schematic diagram of the whole prepressing device of Hanging Basket shown in Fig. 2;
Fig. 4 connects connecting joint point diagram between suspension rod and distribution beam in the whole prepressing device of Hanging Basket shown in Fig. 2;
Fig. 5 is the Hanging Basket three-dimensional model diagram of setting up in embodiment;
Fig. 6 is the whole prepressing device illustraton of model of setting up in embodiment;
Fig. 7 A and Fig. 7 B illustrate the maximal bending moment of span centre, Fig. 7 A is the maximal bending moment of span centre under actual concreting state, Fig. 7 B is when in the whole prepressing device of the Hanging Basket of the specific embodiment of the invention, upper distribution beam is positioned at sliding beam 1/4 and 3/4 position, lower distribution beam and is positioned at end basket longeron 1/4 and 3/4 position, the maximal bending moment of span centre.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the whole prepressing device of Hanging Basket of the present invention is elaborated.
The primary structure of Hanging Basket comprises main couple system, walking system, anchor system, hangar system and collet system.As shown in Figure 1, sliding beam 2 longitudinally arranges along bridge, be arranged in main couple 1 below of main couple system, by the suspension rod 3 in hangar system, be connected with main couple 1, end basket longeron 5 in collet system longitudinally arranges along bridge, be positioned at Hanging Basket bottom, by the suspender belt 4 in hangar system, be connected with main couple 1.
In practice of construction process, sliding beam 2 has been born very large load.Therefore, precompressed process should make also bearing load of sliding beam 2.In order to realize this purpose, whole prepressing device provided by the invention is provided with connected system, and when at collet system load application, this connected system can be assigned to load sliding beam 2, make sliding beam 2 and Hanging Basket collet system shared load, thereby reach whole stressed object.
As shown in Figure 1, this connected system comprises distribution beam and is connected suspension rod 8.Distribution beam is divided into distribution beam 6 and lower distribution beam 7, and upper distribution beam 6 is arranged on sliding beam 2, and lower distribution beam 7 is arranged on end basket longeron 5, connects suspension rod 8 for connecting upper distribution beam 6 and lower distribution beam 7.
Loading system comprises executing carries member 10 and loads longeron 9.Loading longeron 9 is laid in lower distribution beam 7 along bridge longitudinal (being bridge length direction).Execute a year member 10 and can select jack.Jack is arranged in and loads on longeron 9 at bridge lateral (being bridge cross-sectional direction) interval, and the number of jack is identical with number and the spacing of loading longeron 9 with spacing.Execute carry a member 10 can also be other there is enough weight can be as the material of load, for example sand pocket or reinforcing bar.
In the whole prepressing device of Hanging Basket of the present invention, reaction frame system can also be set, its Main Function is to provide support position for loading system.As shown in Figures 2 and 3, reaction frame system can be to using the space structures that built-in fitting 11, horizon bar 12, brace 13 and cross bar 14 etc. form as main member.Built-in fitting 11 can for example, for example, be comprised of channel-section steel (six roots of sensation 10# channel-section steel) and steel plate (steel plate of 20mm), and anchorage length is determined according to the actual loading of engineering.Horizon bar 12 and brace 13 can adopt wide width wing edge H shaped steel, and cross bar 14 also can adopt wide width wing edge H shaped steel.Cross bar 14 arranges along bridge lateral, and with built-in fitting 11(on the lower under built-in fitting) substantially in same level.Horizon bar 12 longitudinally arranges along bridge, and its two ends are welded on respectively built-in fitting under built-in fitting 11(on the lower) and cross bar 14.One end of brace 13 is welded on the upper built-in fitting of top built-in fitting 11(), the other end and cross bar 14 welding.
When selecting jack as executing when carrying a member 10 and loading, load is distributed to end basket longeron 5 by loading longeron 9 by lower distribution beam 7, also via connecting suspension rod 8 and upper distribution beam 6, be assigned to sliding beam 2 simultaneously, make end basket longeron 5 and sliding beam 2 shared loads in cradle structure, thereby reach whole stressed object.Under actual concreting state, end basket longeron 5 and sliding beam 2 are all the simply supported beams under Uniform Load, and their span centre maximal bending moment is that qL2/8(q is the combined value of evenly distributed load on simply supported beam, and the calculating that L is simply supported beam is across footpath) (seeing Fig. 7 A).For the end basket longeron 5 of actual response Hanging Basket and the force-bearing situation of suspension rod 3, upper distribution beam 6 and lower distribution beam 7 can arrange respectively twice, and upper distribution beam 6 is arranged in 1/4 and 3/4 position of sliding beam 2, lower distribution beam 7 is arranged in 1/4 and 3/4 position of end basket longeron 5, and its span centre maximal bending moment is also for qL2/8(is shown in Fig. 7 B like this).Upper distribution beam 6 and lower distribution beam 7 can adopt double flute steel (for example 32b# double flute steel) interval Plate Welding to form, and connect the fining twisted steel that suspension rod 8 can adopt Ф 32.Upper distribution beam 6 and lower distribution beam 7 be connected between suspension rod 8 and can firmly connect by modes such as nuts 15, as shown in Figure 4.
Embodiment
By specific embodiment, come below that the present invention will be described in more detail.
1. project background
Bridge is continuous box girder, and spanning consists of the single box single chamber continuous beam of 40m+3*70m+40m.The wide 13m of case back, the long 3.45m of frange plate, the deck-molding 4.2m of fulcrum place, span centre deck-molding 2.2m, the thick second-degree parabola of pressing of deck-molding and base plate changes.The thick 70cm of the thick 70cm～50cm(fulcrum of web place's web), base plate thickness is that 110cm～30cm(fulcrum place base plate thickness is 110cm), top plate thickness 28cm.
Case beam is built minute 8 stages, and wherein 0# piece beam segment length is 10m, and closure segment length is 2.0m, and the cantilever length of case beam is: 1-5 beam section is 4.0m, and 6-7 beam section is 4.5m.Closure segment length is 2m, and case beam adopts C55 concreting.The piece section that Hanging Basket cantilever casting box girder is the heaviest is 1# piece, and its weight is 135t.
2. cradle structure
Bridge adopts Diamond-Shape Form Traveler construction, and the primary structure of Diamond-Shape Form Traveler comprises main couple system, walking system, anchor system, hangar system and collet system.
The space truss that the purlin sheet that main couple is assumed diamond in shape by two profiles forms at its horizontally set front beam 18 and rear cross beam 19, and see Fig. 5 at two sides montant 25() in the middle of truss is set to improve spatial stability and the rigidity of main couple, main couple rod member adopts 32b# double flute steel both sides welding steel plate, adopts 40C r steel pin pivot pin to connect between rod member.
Hanging Basket is at the complete one section of case beam of cantilever, concrete strength reaches 50M P a, after tension of prestressed tendon, utilizing 4 cover 10t chain blocks slowly to draw equably two main couples moves forward, by suspender belt 4, drive end platform (not shown) and interior external mold (not shown) along sliding beam 2 to front slide simultaneously, for reducing frictional resistance, between walking track (not shown) surface and slip support abutment (not shown) and track, establish the thick corrosion resistant plate of 4mm.Walking track is by the vertical prestressing Bar Anchorage of beam body.Because bridge bridge trend is on curve, therefore, move towards track surface cap when design and adopt interval welding, the vertical prestressing reinforcing bar side position between every two cover plates all leaves the space of 120mm*150mm, to adjust the run trace of Hanging Basket.
Hangar system is used for connecting hanging basket main truss 1 and bottom die platform (not shown), wherein suspender belt 4 use are of a size of the steel plate that 25mm*150mm material is Q345B, suspension rod 3 adopts the finish rolling deformed bar of diameter 32mm, regulates the absolute altitude of collet system with jack lifting appliance.
Collet system is comprised of several parts such as front joist 16, rear joist 17, end basket longeron 5, landing beam (not shown), front guardrail (not shown), side rail (not shown) and operating platform (not shown), end basket longeron 5 is bolted fixing (brill punching is joined at scene) with the cross rib of bed die template (not shown), front joist 16 is connected with front beam 18 by suspender belt 4, during concreting, rear joist 17 is anchored in the completed case beam of leading portion base plate.
External mold template (not shown) adds steel band of model by 6mm steel plate and side form Truss Steel forms.For ease of construction, internal mold panel adopts the thick bamboo offset plate of 18mm, and back cord adopts the lumps of wood of 100mm*100mm, adopts adjustable type internal mold bracing frame, and external mold is connected with split bolt with internal mold, inside establishes bracing reinforcement, sliding beam form in adopting, integrated moving inner formwork system.When running into base plate tooth plate, the internal mold inferior horn steel band at place, position can be removed, coordinate scaffold to complete and build; Side form and bed die adopt and external the form of drawing are fixed.External mold lifting beam and interior sliding beam front end are anchored in front beam, and rear end is suspended to waters case beam surface, loosens anchored end during form removal, with platform, sinks and reach.
3. cradle structure analysis
Adopt M I DA S C I V I L2010 finite element software, the main bearing member of Hanging Basket has been carried out to whole three-dimensional modeling, as shown in Figure 5, the rigidity Design cross sections such as model rod member employing, adopt evenly distributed load to load on respectively on end basket longeron 5 and sliding beam 2 to Hanging Basket threedimensional model.The present embodiment adopts the sliding beam 2 of the six roots of sensation altogether, by their position, is divided into interior sliding beam 21 and outer sliding beam 22, and interior sliding beam 21 has 2, and in the middle of being positioned at, outer sliding beam 22 has four, each two (see figure 5)s of both sides.Hanging Basket prefabricating load adopts the concrete gravity of 1.2 times, and the structure according to case beam and Hanging Basket, loads Hanging Basket, and its force path is as follows:
(1) the case beam wing plate that box beam flange plate weight concrete has been constructed by last sections respectively by outer sliding beam 22 and the front beam 18 of main truss cradle are born.
(2) the case back plate that case back board concrete weight has been constructed by last sections respectively by interior sliding beam 21 and the front beam 18 of main truss cradle are born.
(3) case beam base plate, case beam that web concrete weight has been constructed by last sections respectively and the front beam 18 of main truss cradle are born.
(3-1) Hanging Basket main bearing member stressing conditions is analyzed
According to calculating, the internal force situation of suspension rod 3, suspender belt 4 and main couple is as follows.
(1) stressing conditions of six roots of sensation suspension rod 3 is respectively: outermost two stressed be all respectively 27kN, middle four stressed be respectively 40.5kN.The stressing conditions of five suspender belts 4 is as follows: outermost two stressed be respectively 92.6kN, middle one stressed be 106.7kN, two stressed 151.1kN that are in inferior outside.From the above results, suspension rod 3 is 810kN with the internal force summation of suspender belt 4, is bearing half of 1.2 times of concrete gravity total load 1620kN.
(2) brace 20 and front upper horizon bar 23 bearing tensions after main couple, be respectively 85.9kN and 66.3kN; Rear lower horizon bar 24, montant 25 and front brace 26 bear pressure, are respectively 66.3kN, 57.4kN and 77.7kN.
(3) end basket longeron 5 maximum （normal） stresses are 96.9M P a, and sliding beam 2 maximum （normal） stresses are 69.8M P a.
(4) the maximum hogging moment of front beam 18 is 205.2kN.m, and maximum positive bending moment is 104.7kN.m; The maximum hogging moment of rear cross beam 19 is 101.2kN.m.
(5) cradle structure maximum vertical displacement is 27mm, occurs in outermost sideslip beam 22 and front beam 18 suspension rod junctions, lower end; Main couple maximum vertical displacement is 22mm, is positioned at forward terminal place; Front beam 18 maximum vertical displacement are 27mm, are positioned at its both sides outermost end; End basket longeron 5 maximum displacements are 25mm, are positioned at the intersection with suspender belt 4.
(3-2) Hanging Basket precompressed result
Adopt two kinds of precompressed modes that above-mentioned cradle structure is carried out precompressed and compared.
The first is common reaction frame pre-pressing method, and sliding beam 2 is not born load, and concrete gravity is equivalent to point load, all acts on basket longeron 5 middle parts, the end, and its computation model is different except load, and all the other are all identical with the original structure before precompressed.
The second adopts whole prepressing device precompressed, respectively in the 1/4 and 3/4 position horizontally set twice distribution beam (going up distribution beam 6 and lower distribution beam 7) of sliding beam 2 and end basket longeron 5, load is equivalent to point load, act on the position of intersecting point place of distribution beam and end basket longeron 5 and sliding beam 2, upper distribution beam 6 connects by being connected suspension rod 8 with lower distribution beam 7, and its computation model as shown in Figure 6.
Reaction frame method precompressed interpretation of result is as follows:
(1) suspension rod 3 is 810kN with the internal force summation of suspender belt 4, bearing half of 1.2 times of concrete gravity total load 1620kN, but suspension rod 3 is not born load, and load is all born by suspender belt 4.The concrete stressing conditions of five suspender belts 4 is as follows: a middle stressed minimum is 127.5kN, is secondly two of outermost, be all 161.3kN, and suspender belt 4 outside twice is stressed is all 180kN.
(2) brace 20 and front upper horizon bar 23 bearing tensions after main couple, be respectively 85.9kN and 66.3kN; Rear lower horizon bar 24, montant 25 and front brace 26 bear pressure, are respectively 66.3kN, 57.4kN and 77.7kN.Internal force numerical values recited is identical with original structure stressing conditions before precompressed.
(3) basket longeron 5 maximum （normal） stresses are 258.3M P a at the end, have exceeded the yield stress of Q235 steel, but sliding beam 2 is not born load, and stress is 0M P a.
(4) the maximum hogging moment of front beam 18 is 88.7kN.m, and maximum positive bending moment is 206.4kN.m; Rear cross beam 19 is without load action.
(5) cradle structure maximum vertical displacement is 29mm, occurs in end basket longeron 5 places, web centre position; Main couple maximum vertical displacement is 22mm, is positioned at its forward terminal place; Front beam 18 maximum vertical displacement are 26mm, are positioned at its middle part.
The interpretation of result of whole prepressing device preloading is as follows:
(1) stressing conditions of six roots of sensation suspension rod 3 is respectively as follows: two stressed minimums of outermost, be 25.8kN, be secondly in the middle of two, be all 37.3kN, stressed maximum be time outside two, stress value is all 40.4kN; The stressing conditions of five suspender belts 4 is: two stressed minimums of outermost are all 94.3kN, and the stressed maximum in two, inferior outside, is respectively 152.3kN, and middle stress value is 109.8kN.From the above results, suspension rod 3 is 810kN with the internal force summation of suspender belt 4, is bearing half of 1.2 times of concrete gravity total load 1620kN, and suspension rod 3 distinguishes basic with the internal force of suspender belt 4 and original structure is stressed consistent;
(2) brace 20 and front upper horizon bar 23 bearing tensions after main couple, be respectively 85.9kN and 66.3kN; Rear lower horizon bar 24, montant 25 and front brace 26 bear pressure, are respectively 66.3kN, 57.4kN and 77.7kN.Internal force numerical values recited is identical with original structure stressing conditions before precompressed.
(3) basket longeron 5 maximum （normal） stresses are 102.5MP a at the end, and sliding beam 2 maximum （normal） stresses are 70.0M P a, and stress intensity and original structure are very identical;
(4) the maximum hogging moment of front beam 18 is 201.8kN.m, and maximum positive bending moment is 110.4kN.m; The maximum hogging moment of rear cross beam 19 is 85.8kN.m, and moment of flexure size differs 15% left and right with original structure.
(5) cradle structure maximum vertical displacement is 27mm, occurs in outermost sideslip beam 22 and front beam 18 suspension rod junctions, lower end; Main couple maximum vertical displacement is 22mm, is positioned at forward terminal place; Front beam 18 maximum vertical displacement are 27mm, are positioned at its both sides outermost end; End basket longeron 5 maximum displacements are 25mm, are positioned at and suspender belt 4 intersections, and displacement result and original structure are stressed to fit like a glove.
By the analysis of above original structure and two kinds of precompressed schemes, known:
(1) reaction frame pre-pressing method method is easy, can make hanging basket main truss obtain real pre-compressed effect.But due to it, affected by point load larger, and only have end basket longeron 5 to bear load, and suspension rod 3 does not stress, and suspender belt 4 bears whole load; Displacement is large compared with original structure, and maximum displacement occurs in end basket longeron 5 span centres; End while basket longeron 5 normal stress are obviously greater than original structure, surpass the yield strength of steel in the present embodiment, show that end basket longeron 5 is destroyed.
(2) adopting whole prepressing device precompressed, is, between end basket longeron 5 and sliding beam 2, connected system is set, and by rational coupling stiffness is set, makes end basket longeron 5 and sliding beam 2 simultaneously stressed, and result shows, this precompressed mode and actual loading are very identical.
(3-3) the whole prepressing device construction method of Hanging Basket
The method construction technology is carried out as follows:
Built-in fitting → Hanging Basket is set and installs → install reaction frame system → installation connected system → lay loading system → Hanging Basket precompressed → dismounting prepressing device.
Specific construction operation comprises:
(1) built-in fitting is set
When 0# constructs, the built-in fitting processing in advance 11 is installed on to web corresponding position, and carries out spot welding with structure reinforcing bars and fix, guarantee can not change at concreting state upper/lower positions, the required reinforcing bar of built-in fitting 11 cross section meets shearing resistance requirement, and its anchorage length meets resistance to plucking requirement.
(2) Hanging Basket is installed
Hanging Basket is installed according to the feature of structure stress, and running gear-anchor system-main couple system-hangar system-cunning beam and end basket system are installed successively.
(3) reaction frame system is installed
Reaction frame system adopts and is welded to connect, and according to the order of horizon bar 12 → brace 13 → cross bar 14, is welded into successively space structures.
(4) connected system is installed
Between basket longeron 5 at the bottom of Hanging Basket and sliding beam 2, laterally lay the distribution beam that double flute steel is welded, in the relevant position, gap as between the channel-section steel of distribution beam, penetrate and connect suspension rod 8.Connect suspension rod 8 and adopt fining twisted steel, fixing with nut 15 up and down, it is just started stressed.
(5) lay loading system
In lower distribution beam 7, corresponding position is laid and is loaded longeron 9, and below the crossbeam 14 that loads longeron 9 medium positions, reaction frame system, places jack as executing a year member 10.Loading longeron 9 and jack desired height should consider when built-in fitting 11 is installed.
(6) Hanging Basket precompressed
Hanging Basket precompressed can divide six grades to carry out, the load at every turn applying is respectively 20%, 40%, 60%, 80%, 100%, 120%, in loading procedure, keep a close eye on the situation of change of Hanging Basket, respectively control point is measured, record the deformation values of Hanging Basket, while being loaded into maximum value, should unloading after displacement downwarp is stable.Reach the object of the nonlinear deformation of eliminating structure, after completion of discharge, by the difference before and after unloading, obtain the elastic deformation of structure, as the later stage, adjust the foundation of formwork erection absolute altitude.
(7) remove prepressing device
The dismounting of prepressing device is contrary with erection sequence, successively removes each rod member, and built-in fitting can be imbedded Liang Tizhong, need not remove.
The whole prepressing device of Hanging Basket provided by the invention has that construction is convenient, material materials are few, simple to operate, pre-compressed effect is good, and is not subject to multifactorial impacts the such as landform, weather.By connected system being set between upper and lower longeron (being the sliding beam 2 described in the present embodiment and end basket longeron 5), structure is connected into common stressed system, the load that distributes upper and lower longeron according to the rigidity of connected system, reach the object matching with actual loading, can obtain good pre-compressed effect.
By embodiment, the present invention is had been described in detail above, but the present invention is not limited to this.Reaching under the prerequisite of the object of the invention, those of ordinary skills can make various modifications and variations to the present invention.
Claims (6)
1. the whole prepressing device of Hanging Basket, comprising: loading system and connected system, and described loading system is arranged on the end basket longeron of described Hanging Basket, when loading system load application, connected system, for load being distributed to the superstructure of described Hanging Basket, makes described Hanging Basket integral body stressed
Described connected system connects the end basket longeron of described Hanging Basket and the sliding beam in described Hanging Basket superstructure.
2. the whole prepressing device of Hanging Basket according to claim 1, it is characterized in that, described connected system comprises distribution beam and is connected suspension rod, described distribution beam comprises distribution beam and lower distribution beam, described upper distribution beam is positioned on described sliding beam, described lower distribution beam is positioned on basket longeron of the described end, and described connection suspension rod connects described upper distribution beam and described lower distribution beam.
3. the whole prepressing device of Hanging Basket according to claim 2, is characterized in that, described upper distribution beam is arranged on 1/4 and 3/4 position of described sliding beam, and described lower distribution beam is arranged on 1/4 and 3/4 position of basket longeron of the described end.
4. the whole prepressing device of Hanging Basket according to claim 3, is characterized in that, also comprises reaction frame system, for supporting described loading system.
5. the whole prepressing device of Hanging Basket according to claim 4, described reaction frame system comprises built-in fitting, horizon bar, brace and cross bar, described built-in fitting comprises built-in fitting and lower built-in fitting, and described cross bar arranges along bridge lateral, and with described lower built-in fitting in same level; Described horizon bar longitudinally arranges along bridge, and its two ends are connected with described cross bar with described lower built-in fitting respectively; One end of described brace is connected to described upper built-in fitting, and the other end is connected with described cross bar.
6. the whole prepressing device of Hanging Basket according to claim 4, it is characterized in that, described loading system comprises executing carries member and loads longeron, described in execute and carry a member and be arranged on described loading longeron and by described reaction frame system support, described loading longeron is positioned at the top of described lower distribution beam.
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| CN201210442559.0A CN102912738B (en) | 2012-11-07 | 2012-11-07 | Overall prepressing device for hanging basket |
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| CN201210442559.0A CN102912738B (en) | 2012-11-07 | 2012-11-07 | Overall prepressing device for hanging basket |
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| CN102912738A CN102912738A (en) | 2013-02-06 |
| CN102912738B true CN102912738B (en) | 2014-12-03 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404890A (en) * | 2014-11-10 | 2015-03-11 | 黄叶芳 | Hanging bracket device |
| CN104631341A (en) * | 2015-01-29 | 2015-05-20 | 中铁港航局集团有限公司 | Novel hanging basket prepressing system and detecting method thereof |
| CN105069193B (en) * | 2015-07-20 | 2020-04-07 | 南宁市政工程集团有限公司 | Construction method for matching finite element analysis software with triangular hanging basket |
| CN105002832B (en) * | 2015-07-23 | 2016-08-24 | 上海外经集团控股有限公司 | Utilize the method that the spike of loop wheel machine adjusts suspender belt |
| CN105002833B (en) * | 2015-07-25 | 2016-10-12 | 西安科技大学 | Suspension Hanging Basket preloading method |
| CN105714688B (en) * | 2016-03-13 | 2017-05-10 | 中交一公局桥隧工程有限公司 | Reverse prepressing device for front-support movable suspended scaffolding |
| CN109267488B (en) * | 2018-10-16 | 2020-09-29 | 中铁四局集团有限公司 | Method for preloading segment girder bridge fabrication machine by utilizing dynamic concentrated load |
| CN109682690B (en) * | 2019-01-22 | 2024-04-02 | 中铁十六局集团第五工程有限公司 | Intelligent loading system for hanging basket simulation |
| CN111501577B (en) * | 2020-04-16 | 2021-07-16 | 贵州路桥集团有限公司 | Hanging basket integral prepressing detection method |
| CN111778876A (en) * | 2020-07-29 | 2020-10-16 | 中建七局交通建设有限公司 | Construction method of wide hanging basket |
| CN111851308A (en) * | 2020-08-06 | 2020-10-30 | 中交二公局第三工程有限公司 | Prepressing system and method for suspension casting hanger of corrugated steel web continuous rigid frame beam bridge |
| CN112627060A (en) * | 2020-12-30 | 2021-04-09 | 中国建筑土木建设有限公司 | Side-span cast-in-place section cantilever bearing system and construction method thereof |
| CN113882279B (en) * | 2021-10-22 | 2024-04-02 | 中建三局集团有限公司 | Self-walking and adjusting concrete continuous beam cantilever pouring construction equipment and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007047438B4 (en) * | 2007-10-04 | 2022-11-24 | Doka Gmbh | Formwork arrangement for the cantilever construction of bridges |
| JP4992156B2 (en) * | 2008-03-26 | 2012-08-08 | 株式会社ピーエス三菱 | Formwork support device for PC bridge construction |
| CN201574359U (en) * | 2009-10-16 | 2010-09-08 | 中铁十七局集团第二工程有限公司 | Hanging basket equivalent preloading device used in high-pier large-span bridge construction |
| CN101949778B (en) * | 2010-08-11 | 2011-10-05 | 中铁三局集团有限公司 | Cradle static loading test method |
| CN201749036U (en) * | 2010-08-11 | 2011-02-16 | 中铁三局集团有限公司 | Hanging basket static test device |
| CN102004055A (en) * | 2010-10-18 | 2011-04-06 | 中铁十九局集团第一工程有限公司 | Cradle static load test device |
| CN202023150U (en) * | 2011-03-03 | 2011-11-02 | 中铁四局集团第一工程有限公司 | Reaction frame pre-pressing system used in bridge hanging basket construction |
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Effective date of registration: 20170622 Address after: 100068 Fengtai District South Fourth Ring Road, Beijing, No. 163 Patentee after: Beijing municipal administration road and bridge limited company Address before: 100068 Fengtai District South Fourth Ring Road, Beijing, No. 163 Patentee before: Beijing Road and Bridge Construction Co., Ltd. |