CN104746438B - A kind of Hanging Basket jack preloading method - Google Patents
A kind of Hanging Basket jack preloading method Download PDFInfo
- Publication number
- CN104746438B CN104746438B CN201510041976.8A CN201510041976A CN104746438B CN 104746438 B CN104746438 B CN 104746438B CN 201510041976 A CN201510041976 A CN 201510041976A CN 104746438 B CN104746438 B CN 104746438B
- Authority
- CN
- China
- Prior art keywords
- hanging basket
- precompressed
- jack
- steel
- sections
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- E01D21/10—Cantilevered erection
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of Hanging Basket jack preloading method, described method is in order to be consistent pressure testing loading procedure and practice of construction engineering stress, adopt jack, at 1# section beam base plate span centre, Hanging Basket is loaded to precompressed, at 0# section web end face, reaction frame is set, utilize its opposition to pass through jack, sleeper or lumps of wood distribution beam, plank dig pass applies required prefabricating load to Hanging Basket base plate, the classification of the heaviest sections concrete load of the outstanding filling of simulation loads, realize Hanging Basket jack preloading method convenient, save time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
Description
Technical field
The present invention relates to cradle construction research field, relate in particular to a kind of Hanging Basket jack preloading method.
Background technology
Hanging Basket is the capital equipment in cantilever construction, can be divided into truss-like, cable-stayed type, shaped steel formula and hybrid 4 kinds by version. The requirement to Hanging Basket according to concrete cantilever construction process requirement and design drawing, comprehensively compares various forms Hanging Basket feature, weight, employing steel type, construction technology etc.; Hanging Basket design principle: convenient from heavy and light, simple in structure, more stable and stronger, reach and mounting or dismounting, have stronger can reusing, the features such as stressed rear distortion is little, and space abundance under Hanging Basket, can provide larger operation side, be beneficial to the operation of reinforcing bar template construction.
For inspection Hanging Basket actual bearer ability, determine the security reliability of Hanging Basket under construction least favorable condition, before use, must carry out pressure testing, and check the security of structure by pressure testing, and eliminate Hanging Basket self inelastic deformation, record Hanging Basket strain value, draw load-deformation relationship curve according to data measured, for linear control provides significant data, and according to the data that record, calculate vertical displacement when Hanging Basket pouring construction of each stage.
Main couple belongs to space structure, stressed comparatively complicated, particularly main truss gusset plate, the stressed complexity at entablature and main truss anchor point place, deformation and internal stresses is difficult to accurate analysis, the stress deformation situation of the main test of pressure testing test main couple by the stress deformation situation of hanging basket main truss, is carried out Comprehensive Assessment to the security of this Hanging Basket simultaneously for this reason.
In the prior art, existing continuous beam suspended bracket precompressed construction method is specially: concrete precast block precompressed, sand pocket precompressed, water tank add water for prepressing, enclose water for prepressing, jack precompressed. Above-mentioned construction method all exists the engineering time long, simulating beam section stressed be difficult for etc. shortcoming.
In sum, present inventor realizing in the process of invention technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical problem:
In the prior art, there is length consuming time, operate technical problem difficult, the stressed difficulty of simulating beam section in existing continuous beam suspended bracket precompressed construction method.
Summary of the invention
The invention provides a kind of Hanging Basket jack preloading method, solve existing continuous beam suspended bracket precompressed construction method and had length consuming time, the technical problem such as not easy to operate, realize that Hanging Basket jack preloading method facilitates, saves time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of Hanging Basket jack preloading method, and described method comprises:
Step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end;
Step 2: i-steel component is undertaken assembled by size, weld with pre-embedded steel slab face;
Step 3: jack is installed, and jack upper and lower end parts all arranges I-steel and distributes stressedly, longitudinally lays the plank that N road is equidistantly put between the Two bors d's oeuveres I-steel of jack bottom and bed die, and described N is more than or equal to 2 positive integer, and carries out jack debugging;
Step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test;
Step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, and hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation; After fullcharging, measure once each control point deformation values every 1h; Hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish; When precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack; The unloading of unloading time stage, and control point is measured;
Step 6: carry out control point survey after unloading;
Step 7: remove Hanging Basket precompressed support;
Step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct cradle construction.
Further, described reaction frame is specially: 32a I-steel reaction frame.
Further, described I-steel is specially: 25a Two bors d's oeuveres I-steel.
Further, 10 distortion monitoring points are arranged in described measurement control point precompressed altogether, be respectively towards cantilever segment direction entablature A1, B1 point sill A2, B2 point and Hanging Basket front and rear fulcrum, rear cross beam left and right two-end part before 1# piece cantilever end, A1, B1, A2, B2 point.
Further, described point of 5 grades of loadings are carried out Hanging Basket precompressed and are specially: point 20%, 60%, 80%, 100%, 120% pre-pressure loading is carried out Hanging Basket precompressed.
Further, described built-in fitting specifically comprises: steel plate, the described steel plate back side is welded with M anchoring piece, described M is more than or equal to 1 positive integer, described anchoring piece is specially Φ 28 screw-thread steels, the curved arc that is bundled into of described screw-thread steel, the top of described screw-thread steel and the welding of the described steel plate back side, the two ends of described screw-thread steel are hook solid.
The one or more technical schemes that provide in the embodiment of the present application, at least have following technique effect or advantage:
Owing to having adopted, Hanging Basket jack preloading method is designed to comprise: step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end, step 2: 32a i-steel component is undertaken assembled by size, weld with pre-embedded steel slab face, be welded into reaction frame bracket, when welding, require weld seam full, must not have solder skip, dry joint, must not residual welding slag, guarantee welding quality, step 3: jack is installed, jack upper and lower end parts all arranges 25a Two bors d's oeuveres I-steel and distributes stressed, between the on-the-spot Two bors d's oeuveres I-steel in jack bottom and bed die, longitudinally lay the plank that 7 roads are equidistantly put, to ensure that force-bearing situation conforms to condition of construction, can avoid again contacting with the rigidity of base plate simultaneously. carry out jack debugging, carry out the front preparation of precompressed. , step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test, step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, after hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation, after fullcharging, measure once each control point deformation values every 1h. hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish, when precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack, the unloading of unloading time stage, and control point is measured, step 6: carry out control point survey after unloading, step 7: remove Hanging Basket precompressed support, step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct the technical scheme of cradle construction, , for pressure testing loading procedure and practice of construction engineering stress are consistent, adopt jack, at 1# section beam base plate span centre, Hanging Basket is loaded to precompressed, at 0# section web end face, reaction frame is set, utilize its opposition to pass through jack, sleeper or lumps of wood distribution beam, plank dig pass applies required prefabricating load to Hanging Basket base plate, the classification of the heaviest sections concrete load of the outstanding filling of simulation loads, adopt 0# piece web position pre-embedded steel slab as holding force, cancel pre-buried fining twisted steel in cushion cap, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, divide into sleeper power transmission distribution beam and plank pad by hydraulic jack, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, so, efficiently solve existing continuous beam suspended bracket precompressed construction method and have length consuming time, operation is difficult for, the technical problem of the stressed difficulty of simulating beam section, and then it is convenient to have realized Hanging Basket jack preloading method, save time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
Brief description of the drawings
Fig. 1 is the flow chart of Hanging Basket jack preloading method in the embodiment of the present application one;
Fig. 2 is built-in fitting layout drawing in the embodiment of the present application one;
Fig. 3 measures control point distribution schematic diagram in the embodiment of the present application one;
Fig. 4 is the side view of built-in fitting in the embodiment of the present application one;
Fig. 5 is the front view of built-in fitting in the embodiment of the present application one;
Fig. 6 is Hanging Basket jack precompressed displacement changing curve schematic diagram;
Fig. 7 is Hanging Basket jack precompressed schematic diagram in the embodiment of the present application one;
Wherein, 1-pre-embedded steel slab, 2-reaction frame welding position, entablature before 3-, suspension rod before 4-, cross member before 5-, 6-Φ 28 screw-thread steels, 7-bearing center line, 8-rhombus support, 9-0# piece web pre-embedded steel slab, 10-rear suspension bar, 11-32a I-steel reaction frame, 12-25a I-steel Two bors d's oeuveres distribution beam, 13-jack, the 14-lumps of wood, 15-bottom die platform.
Detailed description of the invention
The invention provides a kind of Hanging Basket jack preloading method, having solved existing continuous beam suspended bracket precompressed construction method there is length consuming time, operates technical problem difficult, the stressed difficulty of simulating beam section, realize that Hanging Basket jack preloading method facilitates, saves time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
Technical scheme during the application implements is for solving the problems of the technologies described above. General thought is as follows:
Adopted Hanging Basket jack preloading method be designed to comprise: step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end, step 2: 32a i-steel component is undertaken assembled by size, weld with pre-embedded steel slab face, be welded into reaction frame bracket, when welding, require weld seam full, must not have solder skip, dry joint, must not residual welding slag, guarantee welding quality, step 3: jack is installed, jack upper and lower end parts all arranges 25a Two bors d's oeuveres I-steel and distributes stressed, between the on-the-spot Two bors d's oeuveres I-steel in jack bottom and bed die, longitudinally lay the plank that 7 roads are equidistantly put, to ensure that force-bearing situation conforms to condition of construction, can avoid again contacting with the rigidity of base plate simultaneously. carry out jack debugging, carry out the front preparation of precompressed. , step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test, step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, after hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation, after fullcharging, measure once each control point deformation values every 1h. hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish, when precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack, the unloading of unloading time stage, and control point is measured, step 6: carry out control point survey after unloading, step 7: remove Hanging Basket precompressed support, step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct the technical scheme of cradle construction, , for pressure testing loading procedure and practice of construction engineering stress are consistent, adopt jack, at 1# section beam base plate span centre, Hanging Basket is loaded to precompressed, at 0# section web end face, reaction frame is set, utilize its opposition to pass through jack, sleeper or lumps of wood distribution beam, plank dig pass applies required prefabricating load to Hanging Basket base plate, the classification of the heaviest sections concrete load of the outstanding filling of simulation loads, adopt 0# piece web position pre-embedded steel slab as holding force, cancel pre-buried fining twisted steel in cushion cap, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, divide into sleeper power transmission distribution beam and plank pad by hydraulic jack, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, so, efficiently solve existing continuous beam suspended bracket precompressed construction method and have length consuming time, operation is difficult for, the technical problem of the stressed difficulty of simulating beam section, and then it is convenient to have realized Hanging Basket jack preloading method, save time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
In order better to understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment mono-:
In embodiment mono-, a kind of Hanging Basket jack preloading method is provided, please refer to Fig. 1-Fig. 7, described method comprises:
Step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end, described A0# sections is specially the cast-in-place sections in first, Zhong Dun top;
Step 2: i-steel component is undertaken assembled by size, weld with pre-embedded steel slab 1 face;
Step 3: jack is installed, and jack upper and lower end parts all arranges I-steel and distributes stressedly, longitudinally lays the plank that N road is equidistantly put between the Two bors d's oeuveres I-steel of jack bottom and bed die, and described N is more than or equal to 2 positive integer, and carries out jack debugging;
Step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test;
Step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, and hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation; After fullcharging, measure once each control point deformation values every 1h; Hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish; When precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack; Unloading time stage unloading, and control point is measured, described A1# sections is specially middle pier first sections to end bay direction, described B1# sections be specially middle pier in across first sections of direction;
Step 6: carry out control point survey after unloading;
Step 7: remove Hanging Basket precompressed support;
Step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct cradle construction.
Wherein, in the embodiment of the present application, continuous beam is defined as A0# with the cast-in-place sections in first, Zhong Dun top, middle pier in across direction be followed successively by B1, B2 ... B6, B0, B6...B2, B1# sections. Middle pier is followed successively by A1, A2...A9# sections to end bay direction.
Draw Hanging Basket jack precompressed displacement changing curve according to the actual precompressed measurement data of Hanging Basket, please refer to Fig. 6, Fig. 6 is Hanging Basket jack precompressed displacement changing curve schematic diagram:
Analyze known according to displacement changing curve:
(1) 0～1 stage: for be loaded into 20% weight from original state, this stage control point height change curve is steeper, the state that Hanging Basket only carries the weight such as template by the starting stage is converted into the stressed 20% weight state that reaches, and deflection is mainly made up of inelastic deformation and part strain.
(2) 1～2 stage: this stage is from 20% weight state load to 60% weight, this stage first half section elevation change curve slope remains unchanged substantially, elevation changes difference, and mainly inelastic deformation and small part strain form again, second half section curve slows down, elevation changes difference and is mainly made up of strain and small part inelastic deformation, and all stage elevation changes the corresponding increase by 40% of difference and loads the strain and the inelastic deformation that bring.
(3) 2～3 stages: this stage elevation changed the corresponding increase by 20% of difference and loaded the strain of bringing from 60% weight state load to 80% weight this stage.
(4) 3～4 stages: this stage elevation changed the corresponding increase by 20% of difference and loaded the strain of bringing from 80% weight state load to 100% weight this stage.
(5) 4～5 stages: this stage elevation changed the corresponding increase by 20% of difference and loaded the strain of bringing from 100% weight state load to 120% weight this stage.
From curve map analysis, be loaded into after 60% weight, the slope of curve changes very little, illustrates that this thing inelastic deformation can be thought to be completely eliminated, and can determine 20% weight according to slope value and load the elevation bringing and change about 3mm.
Utilize 1～2 stage with stable after slope value poor, can calculate inelastic deformation and be about 21mm. Elevation changing value while utilizing 100% loading and inelastic deformation value poor, can calculate 1# section cantilever end strain is 13.4mm. Consider, in the time of 2～3 stage, still to have part inelastic deformation, should be greater than 21mm so inelastic deformation total amount is actual, comprehensive elastic deformation value is got 15mm, and as building front adjustment formwork elevation measuring, applies the foundation of camber value.
Hanging Basket does not occur any abnormal in precompressed process, illustrates that the intensity of Hanging Basket and bearing capacity meet the demands, safe and reliable. The strain data and curves analysis of loads at different levels simulates Hanging Basket imposed load and elastic deformation amount's linear relation by least square method:
(h is Hanging Basket elastic deformation amount to h=0.00837 × F+6.582, mm; F is the deadweight of each beam section, kN).
Wherein, in the embodiment of the present application, described reaction frame is specially: 32a I-steel reaction frame, this kind of reaction frame can utilize 32a I-steel Site Welding to form, processing method is simple, is easy to construction, considers continuous beam web thickness in size, make reaction frame vertically be positioned at web concrete face mid portion as far as possible, avoid web place prestressed anchor recess mouth.
Wherein, in the embodiment of the present application, described I-steel is specially: 25a Two bors d's oeuveres I-steel.
Wherein, in the embodiment of the present application, under described Two bors d's oeuveres I-steel, lay plank (the length 3m equidistantly putting in 7 roads, width 0.35m), first can utilize batten to jack counter-force along bridge to better distributing, in fact lay plank and can effectively avoid jack bottom to contact with bed die rigidity, avoid the local damage to template.
Wherein, in the embodiment of the present application, according to " Railway Prestressed Concrete continuous beam (just structure) cantilever pouring construction technology guide " TZ324-2010 in conjunction with on-the-spot actual arrangement situation, 10 distortion monitoring points are arranged in described measurement control point precompressed altogether, be respectively towards cantilever segment direction entablature A1, B1 point, sill A2, B2 point and Hanging Basket front and rear fulcrum, rear cross beam left and right two-end part before 1# piece cantilever end, A1, B1, A2, B2 point. As accompanying drawing 3.
Wherein, in the embodiment of the present application, described point of 5 grades of loadings are carried out Hanging Basket precompressed and are specially: point 20%, 60%, 80%, 100%, 120% pre-pressure loading is carried out Hanging Basket precompressed.
Wherein, in the embodiment of the present application, please refer to Fig. 4-Fig. 5, described built-in fitting specifically comprises: 500*200*20mm steel plate, the described steel plate back side is welded with M anchoring piece, described M is more than or equal to 1 positive integer, described anchoring piece is specially Φ 28 screw-thread steels 6, the curved arc that is bundled into of described screw-thread steel, the top of described screw-thread steel and the welding of the described steel plate back side, the two ends of described screw-thread steel are hook solid, anchoring piece length is 70cm, front end arranges 180 ° of crotches, crotch diameter 7cm, with Plate Welding, fusion length is not less than 14cm(welding by both sides), wherein, front entablature 3 and front cross member 5 are for supporting front suspension rod 4.
Wherein, in the embodiment of the present application, please refer to Fig. 7, Hanging Basket main body main member: the main member of rhombus support 8(Hanging Basket), front suspension rod 4(connects bottom die platform, the main stressed member of Hanging Basket front end), main stress point when front entablature 3(Hanging Basket precompressed), rear suspension bar 10(connects bottom die platform 15, the main stressed member in Hanging Basket rear end), bottom die platform 15(bears jack 13 counter-forces, reaches pre-compressed effect by be connected transmission counter-force with suspension rod).
Reaction frame pre-pressing main body and auxiliary part: 0# piece web pre-embedded steel slab 9(and reaction frame welding, reaction frame I-steel are by this member and the anchoring of A0# section concrete), 32a I-steel reaction frame 11(reaction frame main component, transmission jack counter-force), 25a I-steel Two bors d's oeuveres distribution beam 12(is laterally evenly passed to jack counter-force in bottom die platform by this member), jack 13(provides Hanging Basket precompression), lumps of wood 14(transmits counter-force, avoids Two bors d's oeuveres I-steel to contact with bottom die platform rigidity, and jack counter-force is longitudinally evenly passed in bottom die platform).
This improvement project, except the advantage that Hanging Basket jack preloading method before having facilitates, saves time, material resource consumption is less, has possessed following advantage:
(1) adopt 0# piece web position pre-embedded steel slab as holding force, cancel pre-buried fining twisted steel in cushion cap, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis;
(2) divide into sleeper power transmission distribution beam and plank pad by hydraulic jack, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation;
(3) reaction frame and preburied component processing are more simple, and it is more easy to operate.
Below in conjunction with concrete example and accompanying drawing, the technical scheme in the application is introduced:
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
Owing to having adopted, Hanging Basket jack preloading method is designed to comprise: step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end, step 2: 32a i-steel component is undertaken assembled by size, weld with pre-embedded steel slab face, be welded into reaction frame bracket, when welding, require weld seam full, must not have solder skip, dry joint, must not residual welding slag, guarantee welding quality, step 3: jack is installed, jack upper and lower end parts all arranges 25a Two bors d's oeuveres I-steel and distributes stressed, between the on-the-spot Two bors d's oeuveres I-steel in jack bottom and bed die, longitudinally lay the plank that 7 roads are equidistantly put, to ensure that force-bearing situation conforms to condition of construction, can avoid again contacting with the rigidity of base plate simultaneously. carry out jack debugging, carry out the front preparation of precompressed. , step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test, step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, after hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation, after fullcharging, measure once each control point deformation values every 1h. hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish, when precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack, the unloading of unloading time stage, and control point is measured, step 6: carry out control point survey after unloading, step 7: remove Hanging Basket precompressed support, step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct the technical scheme of cradle construction, , for pressure testing loading procedure and practice of construction engineering stress are consistent, adopt jack, at 1# section beam base plate span centre, Hanging Basket is loaded to precompressed, at 0# section web end face, reaction frame is set, utilize its opposition to pass through jack, sleeper or lumps of wood distribution beam, plank dig pass applies required prefabricating load to Hanging Basket base plate, the classification of the heaviest sections concrete load of the outstanding filling of simulation loads, adopt 0# piece web position pre-embedded steel slab as holding force, cancel pre-buried fining twisted steel in cushion cap, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, divide into sleeper power transmission distribution beam and plank pad by hydraulic jack, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, so, efficiently solve existing continuous beam suspended bracket precompressed construction method and have length consuming time, operation is difficult for, the technical problem of the stressed difficulty of simulating beam section, and then it is convenient to have realized Hanging Basket jack preloading method, save time, material resource consumption is less, can ensure the timely backfill of cushion cap foundation ditch and ensure the construction of 0# piece bracket basis, make Hanging Basket bottom slab stress more even, Hanging Basket prefabricating load is also closer to practice of construction situation, reaction frame and preburied component processing are more simple, operate more easy technique effect.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and amendment to these embodiment. So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention. Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (6)
1. a Hanging Basket jack preloading method, is characterized in that, described method comprises:
Step 1: pre-buried good reaction frame construction built-in fitting in continuous beam A0# segmental construction process, burial place on A0# segment web, 4 built-in fittings of every end, described A0# sections is specially the cast-in-place sections in first, Zhong Dun top;
Step 2: i-steel component is undertaken assembled by size, weld with pre-embedded steel slab face;
Step 3: jack is installed, and jack upper and lower end parts all arranges I-steel and distributes stressedly, longitudinally lays the plank that N road is equidistantly put between the Two bors d's oeuveres I-steel of jack bottom and bed die, and described N is more than or equal to 2 positive integer, and carries out jack debugging;
Step 4: Hanging Basket precompressed is set and measures control point, carry out the work of precompressed pre-test;
Step 5: Hanging Basket precompressed is carried out in point 5 grades of loadings, and hierarchical loading, holds after lotus 1h, adopts total powerstation to measure and record data each control point elevation; After fullcharging, measure once each control point deformation values every 1h; Hold continuously lotus 4h, in the time that the difference of twice deflection of last Measuring Time section is less than 2mm, can finish; When precompressed, to continuous beam A1# sections and the precompressed simultaneously of B1# sections, precompressed adopts 4 cover 100t jack; Unloading time stage unloading, and control point is measured, described A1# sections is specially middle pier first sections to end bay direction, described B1# sections be specially middle pier in across first sections of direction;
Step 6: carry out control point survey after unloading;
Step 7: remove Hanging Basket precompressed support;
Step 8: Hanging Basket precompressed data are carried out to finishing analysis, draw Hanging Basket strain and inelastic deformation, adjust Hanging Basket floor level, instruct cradle construction.
2. method according to claim 1, is characterized in that, described reaction frame is specially: 32a I-steel reaction frame.
3. method according to claim 1, is characterized in that, described I-steel is specially: 25a Two bors d's oeuveres I-steel.
4. method according to claim 1, it is characterized in that, 10 distortion monitoring points are arranged in described measurement control point precompressed altogether, be respectively towards cantilever segment direction entablature A1, B1 point, sill A2, B2 point and Hanging Basket front and rear fulcrum, rear cross beam left and right two-end part before 1# piece cantilever end, A1, B1, A2, B2 point.
5. method according to claim 1, is characterized in that, described point of 5 grades of loadings are carried out Hanging Basket precompressed and are specially: point 20%, 60%, 80%, 100%, 120% pre-pressure loading is carried out Hanging Basket precompressed.
6. method according to claim 1, it is characterized in that, described built-in fitting specifically comprises: steel plate, the described steel plate back side is welded with M anchoring piece, described M is more than or equal to 1 positive integer, and described anchoring piece is specially Φ 28 screw-thread steels, the curved arc that is bundled into of described screw-thread steel, the top of described screw-thread steel and the welding of the described steel plate back side, the two ends of described screw-thread steel are hook solid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041976.8A CN104746438B (en) | 2015-01-28 | 2015-01-28 | A kind of Hanging Basket jack preloading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041976.8A CN104746438B (en) | 2015-01-28 | 2015-01-28 | A kind of Hanging Basket jack preloading method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104746438A CN104746438A (en) | 2015-07-01 |
| CN104746438B true CN104746438B (en) | 2016-05-18 |
Family
ID=53586641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510041976.8A Active CN104746438B (en) | 2015-01-28 | 2015-01-28 | A kind of Hanging Basket jack preloading method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104746438B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012795A (en) * | 2017-05-22 | 2017-08-04 | 中国铁建大桥工程局集团有限公司 | A kind of continuous bridge pre-pressing bracket device and its construction method |
| CN107034791A (en) * | 2017-06-27 | 2017-08-11 | 中交第三航务工程局有限公司 | A kind of assembling method of Cantilever Casting Construction Hanging Basket |
| CN108824210B (en) * | 2018-07-20 | 2020-04-14 | 中交路桥华南工程有限公司 | Prepressing method of bridge support |
| CN110607765B (en) * | 2019-06-19 | 2021-04-23 | 东南大学 | Intelligent bridge hanging basket prepressing device and control method thereof |
| CN114164771B (en) * | 2021-11-22 | 2023-09-12 | 甘肃建投临夏建设管理有限公司 | Prepressing device and prepressing method for overhead bridge cantilever pouring hanging basket |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2249649T3 (en) * | 2003-03-12 | 2006-04-01 | Doka Industrie Gmbh | DEVICE AND PROCEDURE FOR MANUFACTURING BY SECTIONS OF A CONCRETE STRUCTURE CONCRETEED OR CONCRETE CONCRETE. |
| JP2008088782A (en) * | 2006-10-05 | 2008-04-17 | Zenitaka Corp | Cantilever overhang erection method of corrugated steel plate web bridge |
| JP5279347B2 (en) * | 2008-06-03 | 2013-09-04 | 鹿島建設株式会社 | Hydraulic control system for mobile work vehicles for cantilever installation |
| 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 |
| CN201738246U (en) * | 2010-07-22 | 2011-02-09 | 中建二局土木工程有限公司 | Ground prepressing device for continuous beam hanging basket |
| CN101942809A (en) * | 2010-09-30 | 2011-01-12 | 中铁四局集团第一工程有限公司 | Hanging-basket main-truss prepressing system |
| CN102493342A (en) * | 2011-11-22 | 2012-06-13 | 中铁三局集团第六工程有限公司 | Static-load bracket preloading construction method of continuous beam |
| CN103174097A (en) * | 2013-04-11 | 2013-06-26 | 新疆北新路桥集团股份有限公司 | Supporting pre-stress back tension loading and pre-pressing method for upper steel structure of large-span bridge |
| CN104131516A (en) * | 2014-08-14 | 2014-11-05 | 江苏省交通工程集团有限公司 | Bridge cast-in-cantilever method cradle counter-pressure construction method |
-
2015
- 2015-01-28 CN CN201510041976.8A patent/CN104746438B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104746438A (en) | 2015-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104746438B (en) | A kind of Hanging Basket jack preloading method | |
| CN102051858B (en) | Jack loading triangular truss hanging basket and load test construction method thereof | |
| KR101154489B1 (en) | Apparatus for loading test of railroad bridge, method for calculating load carrying capacity of railroad bridge and method for measuring drooping of railroad bridge | |
| CN108457188A (en) | A kind of walking incremental launching construction by multipoint jacking construction | |
| CN206146751U (en) | A loading device for monospar static test | |
| CN102995669B (en) | Large-tonnage foundation pile uplift-resistant static test connection device, loading counter-force system and method | |
| CN110359374A (en) | A kind of Hanging Basket precompressed counter-force bracket and its construction method | |
| CN103323340A (en) | Mechanical property test device and method of steel-concrete contact interface | |
| CN101824801A (en) | Non-in-situ prepressing method of self-anchored type support frame and self-anchored type support frame thereof | |
| CN202164552U (en) | Prepressing counter-force frame device of model 0 block support frame | |
| Akl et al. | Deflection of in-span hinges in prestressed concrete box girder bridges during construction | |
| CN104964840A (en) | Secondary lining arch foot sedimentation experiment loading device and application method | |
| CN101139819A (en) | Steel strand reversal fulcrum preloading method | |
| Zheng et al. | Use of rubber mat to improve deformation behaviors of ballastless tracks laid on bridges | |
| CN102493342A (en) | Static-load bracket preloading construction method of continuous beam | |
| CN105040598A (en) | Prepressing construction device of cantilever box beam No.0 block and prepressing construction method thereof | |
| CN105350461A (en) | Longitudinal pushing structure of closure segment of continuous rigid frame bridge | |
| CN104452569B (en) | A kind of Long span prestressed concrete beam bridge cloth Shu Fangfa | |
| Yuan et al. | The application of load identification model on the weld line fatigue life assessment for a wheel loader boom | |
| CN202416193U (en) | Asymmetric loading and pre-pressing device for bridge cantilever pouring construction hanging basket | |
| Sadeghi | New advances in analysis and design of railway track system | |
| CN201901847U (en) | Jack loading triangular truss hanging basket | |
| CN104764618B (en) | A kind of bridge cantilever pours the controllable equivalent advanced press load test method of Hanging Basket | |
| CN111877186A (en) | Balanced cast-in-place construction method for beam section bracket of side pier of continuous beam | |
| CN214328534U (en) | 0# block bracket pre-pressing device of continuous rigid frame bridge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |