CN102912738A - Overall prepressing device for hanging basket - Google Patents

Overall prepressing device for hanging basket Download PDF

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Publication number
CN102912738A
CN102912738A CN2012104425590A CN201210442559A CN102912738A CN 102912738 A CN102912738 A CN 102912738A CN 2012104425590 A CN2012104425590 A CN 2012104425590A CN 201210442559 A CN201210442559 A CN 201210442559A CN 102912738 A CN102912738 A CN 102912738A
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China
Prior art keywords
hanging basket
distribution beam
longeron
basket
fitting
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CN2012104425590A
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CN102912738B (en
Inventor
叶锦华
吴杰
吕嘉
王辉
李瑞银
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Beijing municipal administration road and bridge limited company
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BEIJING ROAD AND BRIDGE CONSTRUCTION Co Ltd
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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

The whole prepressing device of Hanging Basket
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
The Hanging Basket precompressed refers at the bridge that adopts cantilever casting construction, before the construction of beginning 1# piece, the construction simulation load case, the Hanging Basket that is installed on the 0# piece is carried out precompressed, intensity, rigidity and the stability of checking cradle structure, eliminate simultaneously the nonlinear deformation of structure, draw the elastic deformation of structure, as the foundation of formwork erection absolute altitude.
The Hanging Basket precompressed is a requisite process in the cantilever bridge construction.Yet along with the development of highway communication industry, the pier stud height constantly increases, and some bridge pier column height is above hundred meters now.In the face of high pier stud like this, the precompressed of Hanging Basket is very difficult; Simultaneously precompressed as far as possible construction simulation actual conditions loads, if be not inconsistent with actual conditions, then can not reach the purpose 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 commonly used 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, is distributed in preloading in the collet system according to actual loading.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; Such as the rainy day, sand pocket weight will not be inconsistent with actual loading.
The 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 the template, and then water filling loads.The advantage of the method is that loading, discharging method are simple, and accurately, easily control.Shortcoming is that the water tank height has surpassed the root deck-molding, and the water tank lateral pressure is quite large; The water tank height is very large, and is 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, and is dangerous large, long construction period.
The jack precompressed refers at the complete cushion cap of in earlier stage having constructed anchor point is set, by steel strand anchor point is connected with end basket longeron, stretch-draw in the collet system, with force reaction on cradle structure, reach the purpose of loading, the method can be used existing tensioning equipment, and is simple and convenient, and labour intensity is low, the cycle is short.But want to use the method more accurately to simulate the actual loading situation, then need the anchor point buried underground more, and pier stud is subjected to Wind effects large when higher.
The reaction frame pre-pressing method is at 0# piece two coxostermums of having constructed tripod to be set, and between tripod and the end basket longeron jack is set, and when the jack applied elongation, reaction frame reacts on load on the end basket longeron, reaches the purpose to the structure precompressed.The method easy construction, quick does not need to drop into more material and facility, is widely used in the bridge construction.But the method is had relatively high expectations to the strength and stiffness of reaction frame, otherwise, can not reach the purpose of precompressed.
Although rear two kinds of methods are practical, also there is obviously deficiency, all only load at the end basket longeron during precompressed, ignored the load on inside and outside sliding beam top.And in the practice of construction process, the load of sliding joist support load is about about 30% of total load.During precompressed, if this part load all is applied on the end basket, and with single-point point load replacement evenly distributed load, the destruction that very easily causes end basket is caused security incident.
In order accurately to simulate Hanging Basket actual loading situation, realize the whole precompressed of Hanging Basket, the existing practice has the front suspension rod at connection nose girder or sliding beam to hang weight, reaches the purpose of load application.Yet the method still has the operation trouble, long construction period, and hoisting difficulty is large, is subjected 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 between end basket longeron and sliding beam or nose girder linkage being set, rationally adjust the rigidity of connecting rod, reach at end basket and load, whole stressed purpose 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 the loading system load application, connected system is used for Load Transfer making Hanging Basket integral body stressed to the Hanging Basket superstructure.
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 the reaction frame system, is used 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 is arranged along bridge lateral, and is in same level with described lower built-in fitting; Described horizon bar vertically arranges along bridge, and its two ends link to each other 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, and described executing carried a member and be arranged on the described loading longeron and by described reaction frame system support, described loading longeron is positioned at the top of described lower distribution beam.
Description of drawings
Fig. 1 is when seeing from bridge one side, the schematic diagram of the whole prepressing device of the Hanging Basket of a specific embodiment of the present invention;
Fig. 2 is when 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 when facing the bridge construction face, the schematic diagram of the whole prepressing device of Hanging Basket shown in Figure 2;
Fig. 4 connects connecting joint point diagram between suspension rod and the distribution beam in the whole prepressing device of Hanging Basket shown in Figure 2;
Fig. 5 is the Hanging Basket three-dimensional model diagram of setting up among the embodiment;
Fig. 6 is the whole prepressing device illustraton of model of setting up among the 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 the actual concreting state, Fig. 7 B is when 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 in the whole prepressing device of the Hanging Basket of the specific embodiment of the invention, 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 vertically arranges along bridge, be arranged in main couple 1 below of main couple system, be connected with main couple 1 by the suspension rod 3 in the hangar system, end basket longeron 5 in the collet system vertically arranges along bridge, be positioned at the Hanging Basket bottom, be connected with main couple 1 by the suspender belt 4 in the hangar system.
In the 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, so that sliding beam 2 and Hanging Basket collet system shared load, thereby reach whole stressed purpose.
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 the sliding beam 2, and lower distribution beam 7 is arranged on the end basket longeron 5, connects suspension rod 8 and is used 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 on the lower distribution beam 7 along bridge vertical (being the bridge length direction).Execute a year member 10 and can select jack.Jack is arranged at bridge lateral (being the bridge cross-sectional direction) interval and loads on the longeron 9, 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 have 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 the reaction frame system can also be set, its Main Function is to provide support the position for loading system.As shown in Figures 2 and 3, the reaction frame system can be the space structures that forms as main member with built-in fitting 11, horizon bar 12, brace 13 and cross bar 14 etc.Built-in fitting 11 can be comprised of channel-section steel (for example six roots of sensation 10# channel-section steel) and steel plate (for example 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 on the lower built-in fitting 11(under built-in fitting) substantially be in same level.Horizon bar 12 vertically arranges along bridge, and its two ends are welded on respectively built-in fitting under on the lower the built-in fitting 11() 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 be assigned to sliding beam 2 via connecting suspension rod 8 and upper distribution beam 6 simultaneously, make end basket longeron 5 and sliding beam 2 shared loads in the cradle structure, thereby reach whole stressed purpose.Under actual concreting state, end basket longeron 5 and sliding beam 2 all are 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 the simply supported beam, and L is that the footpath is striden in the calculating of simply supported beam) (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 seen Fig. 7 B for qL2/8(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 the suspension rod 8 and can firmly connect by modes such as nuts 15, as shown in Figure 4.
Embodiment
Below come by specific embodiment 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 web~thick 70cm of 50cm(fulcrum place web), base plate thickness is that 110cm~30cm(fulcrum place base plate thickness is 110cm), top plate thickness 28cm.
The 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 the case beam adopts C55 concreting.The piece section that the Hanging Basket cantilever casting box girder is the heaviest is the 1# piece, and its weight is 135t.
2. cradle structure
Bridge adopts the 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, the 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 case beam of cantilever, concrete strength reaches 50M P a, after tension of prestressed tendon is complete, utilizing 4 cover 10t chain blocks slowly to draw equably two main couples moves forward, pass through simultaneously suspender belt 4 drive end platform (not shown) and interior external mold (not shown) along sliding beam 2 to front slide, for reducing frictional resistance, establish the thick corrosion resistant plate of 4mm between walking track (not shown) surface and slip support abutment (not shown) and the track.The walking track is by the vertical prestressing Bar Anchorage of beam body.Because bridge bridge trend is on the curve, therefore, move towards track surface cap when design and adopt the 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 usefulness are of a size of the steel plate that the 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 the jack lifting appliance.
The 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 (the brill punching is joined at the scene) with the cross rib of bed die template (not shown), front joist 16 links to each other 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 the 6mm steel plate and the side form Truss Steel forms.For ease of construction, the 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, in establish bracing reinforcement, slide the beam form, the integrated moving inner formwork system in adopting.When running into the base plate tooth plate, the internal mold inferior horn steel band at place, position can be removed, cooperate scaffold to finish 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 the rear end is suspended to waters case beam surface, loosens anchored end during form removal, sinks and reach with platform.
3. cradle structure analysis
Adopt M I DA S C I V I L2010 finite element software, main bearing member to Hanging Basket has been carried out whole three-dimensional modeling, the Hanging Basket threedimensional model 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 the sliding beam 2.The present embodiment adopts the sliding beam 2 of the six roots of sensation altogether, is divided into interior sliding beam 21 and outer sliding beam 22 by their position, 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) of both sides.The Hanging Basket prefabricating load adopts 1.2 times concrete gravity, and the structure according to case beam and Hanging Basket loads Hanging Basket, and its force path is as follows:
(1) the box beam flange plate weight concrete case beam wing plate of having 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 board concrete weight case back plate of having 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, the web concrete weight case beam of having 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 all be 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 the inferior outside.By the above results as can be known, 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 behind the main couple are 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) front beam 18 maximum hogging moments are 205.2kN.m, and maximum positive bending moment is 104.7kN.m; Rear cross beam 19 maximum hogging moments are 101.2kN.m.
(5) the cradle structure maximum vertical displacement is 27mm, occurs in outermost sideslip beam 22 and suspension rod junction, front beam 18 lower end; The main couple maximum vertical displacement is 22mm, is positioned at the 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 above-mentioned cradle structure is carried out precompressed and to compare.
The first is common reaction frame pre-pressing method, and sliding beam 2 is not born load, be point load with concrete gravity equivalence, all acts on basket longeron 5 middle parts, the end, and its computation model is except the load difference, and all the other are all identical with the front original structure of precompressed.
The second adopts whole prepressing device precompressed, respectively in the 1/4 and 3/4 position horizontally set twice distribution beam (namely going up distribution beam 6 and lower distribution beam 7) of sliding beam 2 and end basket longeron 5, be point load with the load equivalence, 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 connecting 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: middle stressed minimum, be 127.5kN, and secondly be two of outermost, all be 161.3kN, suspender belt outside twice 4 is stressed all to be 180kN.
(2) brace 20 and front upper horizon bar 23 bearing tensions behind the main couple are 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.The internal force numerical values recited is identical with original structure stressing conditions before the 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) front beam 18 maximum hogging moments are 88.7kN.m, and maximum positive bending moment is 206.4kN.m; Rear cross beam 19 is without load action.
(5) the cradle structure maximum vertical displacement is 29mm, occurs in place, end basket longeron 5 web centre positions; The 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, secondly be in the middle of two, all be 37.3kN, stressed maximum be two in time outside, stress value is all 40.4kN; The stressing conditions of five suspender belts 4 is: two stressed minimums of outermost all are 94.3kN, and the two stressed maximums in the inferior outside are respectively 152.3kN, and middle stress value is 109.8kN.By the above results as can be known, 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 is basic with the internal force difference of suspender belt 4 and original structure is stressed consistent;
(2) brace 20 and front upper horizon bar 23 bearing tensions behind the main couple are 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.The internal force numerical values recited is identical with original structure stressing conditions before the 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) front beam 18 maximum hogging moments are 201.8kN.m, and maximum positive bending moment is 110.4kN.m; Rear cross beam 19 maximum hogging moments are 85.8kN.m, and the moment of flexure size differs about 15% with original structure.
(5) the cradle structure maximum vertical displacement is 27mm, occurs in outermost sideslip beam 22 and suspension rod junction, front beam 18 lower end; The main couple maximum vertical displacement is 22mm, is positioned at the 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, as can be known:
(1) reaction frame pre-pressing method method is easy, can make hanging basket main truss obtain real pre-compressed effect.But since its affected by point load larger, and only have end basket longeron 5 to bear load, suspension rod 3 does not stress, suspender belt 4 bears whole load; Displacement is large than original structure, and maximum displacement occurs in end basket longeron 5 span centres; End while basket longeron 5 normal stress surpass the yield strength of steel obviously greater than original structure 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 to be set, and by rational coupling stiffness is set, makes end basket longeron 5 and sliding beam 2 simultaneously stressed, and the result shows, this precompressed mode and actual loading are very identical.
(3-3) the whole prepressing device job practices of Hanging Basket
The method construction technology is carried out as follows:
Built-in fitting → Hanging Basket is set installs → install reaction frame system → installation connected system → lay loading system → Hanging Basket precompressed → dismounting prepressing device.
The Specific construction operation comprises:
(1) built-in fitting is set
When 0# constructs, the built-in fitting 11 that processes in advance is installed on the 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 shearing resistance requirement is satisfied in built-in fitting 11 required reinforcing bar cross sections, and its anchorage length satisfies the resistance to plucking requirement.
(2) Hanging Basket is installed
Hanging Basket is installed the characteristics according to structure stress, and running gear-anchor system-main couple system-hangar system-cunning beam and end basket system are installed successively.
(3) the reaction frame system is installed
The reaction frame system adopts and to be welded to connect, and is welded into successively space structures according to the order of horizon bar 12 → brace 13 → cross bar 14.
(4) connected system is installed
Between basket longeron 5 at the bottom of the Hanging Basket and sliding beam 2, laterally lay the distribution beam that the double flute steel is welded, penetrating connection suspension rod 8 as the relevant position, gap between the channel-section steel of distribution beam.Connect suspension rod 8 and adopt fining twisted steel, fixing with nut 15 up and down, it is just begun stressed.
(5) lay loading system
The corresponding position is laid and is loaded longeron 9 on lower distribution beam 7, and the placement jack carries member 10 as executing below the crossbeam 14 that loads longeron 9 medium positions, reaction frame system.Loading longeron 9 and jack desired height should consider when built-in fitting 11 is installed.
(6) Hanging Basket precompressed
The Hanging Basket precompressed can divide six grades to carry out, the load that at every turn applies is respectively 20%, 40%, 60%, 80%, 100%, 120%, keep a close eye on the situation of change of Hanging Basket in the loading procedure, respectively the control point is measured, record the deformation values of Hanging Basket, when being loaded into maximum value, should unloading after the displacement downwarp is stable.Reach the purpose of the nonlinear deformation of eliminating structure, after the completion of discharge, by the difference before and after the unloading, obtain the elastic deformation of structure, adjust the foundation of formwork erection absolute altitude as the later stage.
(7) remove prepressing device
The dismounting of prepressing device is opposite with erection sequence, removes one by one 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, the material materials are few, simple to operate, pre-compressed effect is good, and is not subjected to multifactorial impacts the such as landform, weather.By between upper and lower longeron (being the sliding beam 2 described in the present embodiment and end basket longeron 5), connected system being set, structure is connected into common stressed system, the load that distributes upper and lower longeron according to the rigidity of connected system, reach the purpose that matches with actual loading, can obtain good pre-compressed effect.
Abovely by embodiment the present invention is had been described in detail, 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 (7)

1. the whole prepressing device of a Hanging Basket, comprise: loading system and connected system, described loading system are arranged on the end basket longeron of described Hanging Basket, when the loading system load application, connected system is used for load is distributed to the superstructure of described Hanging Basket, makes described Hanging Basket integral body stressed.
2. the whole prepressing device of Hanging Basket according to claim 1 is characterized in that, described connected system connects the end basket longeron of described Hanging Basket and the sliding beam in the described Hanging Basket superstructure.
3. the whole prepressing device of Hanging Basket according to claim 1 and 2, 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 the described sliding beam, described lower distribution beam is positioned on the basket longeron of the described end, and described connection suspension rod connects described upper distribution beam and described lower distribution beam.
4. the whole prepressing device of Hanging Basket according to claim 3 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.
5. the whole prepressing device of Hanging Basket according to claim 4 is characterized in that, also comprises the reaction frame system, is used for supporting described loading system.
6. the whole prepressing device of Hanging Basket according to claim 5, 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 is arranged along bridge lateral, and is in same level with described lower built-in fitting; Described horizon bar vertically arranges along bridge, and its two ends link to each other 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.
7. Hanging Basket prepressing device according to claim 5, it is characterized in that, described loading system comprises executing carries member and loads longeron, and described executing carried a member and be arranged on the described loading longeron and by described reaction frame system support, described loading longeron is positioned at the top of described lower distribution beam.
CN201210442559.0A 2012-11-07 2012-11-07 Overall prepressing device for hanging basket Active CN102912738B (en)

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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
CN105002832A (en) * 2015-07-23 2015-10-28 上海外经集团控股有限公司 Method for adjusting suspension band by utilizing supporting legs of crane
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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

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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
CN105069193A (en) * 2015-07-20 2015-11-18 南宁市政工程集团有限公司 Method for constructing triangular hanging basket in combination with finite element analysis software
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
CN105002832A (en) * 2015-07-23 2015-10-28 上海外经集团控股有限公司 Method for adjusting suspension band by utilizing supporting legs of crane
CN105002833A (en) * 2015-07-25 2015-10-28 西安科技大学 Suspension type hanging basket prepressing device and hanging basket prepressing method
CN105714688A (en) * 2016-03-13 2016-06-29 中交一公局桥隧工程有限公司 Reverse prepressing device for front-support movable suspended scaffolding
CN109267488A (en) * 2018-10-16 2019-01-25 中铁四局集团有限公司 A method of utilizing dynamic load precompressed beam sections bridge fabrication machine
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
CN111501577A (en) * 2020-04-16 2020-08-07 贵州路桥集团有限公司 Hanging basket integral prepressing system and detection method thereof
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

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