CN105069193B - Construction method for matching finite element analysis software with triangular hanging basket - Google Patents
Construction method for matching finite element analysis software with triangular hanging basket Download PDFInfo
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Abstract
The invention relates to the technical field of a prestress analysis method, in particular to a construction method of matching finite element analysis software with a triangular hanging basket; the method comprises the following steps: SS1, adopting an O # block support method to carry out cast-in-place construction on the pier beam and carrying out temporary consolidation on the pier beam; SS2, optimally designing and installing the triangular light hanging basket by using finite element software; SS3, analyzing the rationality of the prepressing structure of the installed triangular light hanging basket by adopting finite element software; SS4, adjusting the bottom and side molds of the hanging basket; SS5, constructing a reinforcement prestress duct bound to the bottom and the web plate of the hanging basket; SS6, mounting the internal mold of the hanging basket; SS7, constructing a prestressed duct for binding steel bars on a top plate of the hanging basket; SS8, pouring concrete into the bridge, then manufacturing a test block, and curing the concrete; SS9, prestressed tensioning and pore canal grouting of the bridge; and SS10, the hanging basket is moved forward to be in place, and then the folding section is constructed.
Description
Technical Field
The invention relates to the technical field of prestress analysis methods, in particular to a construction method of matching finite element analysis software with a triangular hanging basket.
Background
With the rapid promotion of the urbanization process of China, the construction of municipal engineering infrastructures is continuously developed. Municipal works are mainly served in urban population concentrated areas, the traffic is busy, roads are not suitable for being occupied for a long time due to construction, and therefore the municipal works have the construction properties of short, flat and fast, so that construction machines of the prestressed concrete continuous beam bridge, namely the cradle, tend to be light and convenient, and the triangular cradle is a typical representative of the construction machines.
However, in the existing hanging basket design practice, due to the complexity of structural analysis, the existing calculation is long, although a designer subjectively wants to optimize the structural design as much as possible, on one hand, an effective calculation method is lacked, on the other hand, a systematic method is lacked to guide the bridge structural design and improve the structural design, so that the structural design optimization mainly depends on accumulated engineering experience, the existing design process has high subjectivity, the workload is high, the design period is long, and therefore, the existing design computer method is urgently expected to be improved and optimized, and on the premise of reducing the calculation amount, the structural deformation and stress analysis are carried out according to the actual construction loading sequence of the bridge structure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a triangular light hanging basket and a construction finite element analysis method thereof, relating to the technical field of prestress analysis methods.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the construction method of the finite element analysis software matched with the triangular hanging basket specifically comprises the following steps:
SS1, adopting an O # block support method to carry out cast-in-place construction on the pier beam and carrying out temporary consolidation on the pier beam;
SS2, optimally designing and installing the triangular light hanging basket by using finite element software;
SS3, analyzing the rationality of the prepressing structure of the installed triangular light hanging basket by adopting finite element software;
SS4, adjusting the bottom and side molds of the hanging basket;
SS5, constructing a reinforcement prestress duct bound to the bottom and the web plate of the hanging basket;
SS6, mounting the internal mold of the hanging basket;
SS7, constructing a prestressed duct for binding steel bars on a top plate of the hanging basket;
SS8, pouring concrete into the bridge, then manufacturing a test block, and curing the concrete;
SS9, prestressed tensioning and pore canal grouting of the bridge;
and SS10, the hanging basket is moved forward to be in place, and then the folding section is constructed.
Furthermore, in the steps SS4 to SS10, data of the construction process are collected, a finite element analysis model is established according to the collected construction data, measured data are collected, the simulation value in the model and the collected measured value are compared to modify the control parameters, and then the simulation is carried out step by step according to the construction process again, so that the elevation and the median adjustment value are given.
Furthermore, the assembling of the hanging basket in the step SS2 comprises the installation of a walking track and the installation of a main truss and accessories thereof, wherein the walking track is installed by placing the walking track above two outer side webs of the bridge close to the vertical prestressed tendons; the vertical prestressed tendons need to extend out of the bridge floor by 120-140 mm to ensure that the walking track can be anchored, meanwhile, the center line spacing of the walking track is 622 mm and the deviation is less than or equal to 2mm, the two track surfaces are kept horizontal, the height unevenness is less than or equal to 1mm, and the walking track is anchored by using an anchorage device after rechecking is correct; the main truss and the installation method of the accessories of the main truss are that the movable support is installed on a walking track according to the designed position, then a main beam of the main truss is hung at the working position, the rear part of the main truss is supported and supported stably by a sleeper, the main beam is flat and straight, then the main beam is anchored by finish rolling deformed steel bars, after the vertical rods are installed, the 4 parts of 3t chain blocks are used for pulling the vertical rods in four directions, then the horizontal connecting system, the rear inclined rods and the front inclined rods are sequentially installed, and after one group of main trusses is installed, the other group of truss sheets are installed.
Further, the step SS3 is carried out in a prepressing mode that concrete blocks and sand bags are used as prepressing loads, the sand bags are weighed before entering a field, water immersion is strictly forbidden, load tests are carried out in 5 stages, namely, according to the final box girder segment as a base number, the final box girder segment 1# block 175.5T is loaded according to 30%, 60%, 80%, 100% and 120% respectively, and is unloaded after 120% of loading is finished and is stabilized for 24 hours.
Further, the traveling of the hanging basket comprises three steps of traveling preparation, hanging basket traveling and hanging basket anchoring; and the walking preparation is to finish the falling of the sliding beam of the outer die and the inner die and the bottom basket after the tensioning and the mud jacking of the stress beam of the box girder segment are finished.
Further, the adjustment of the hanging basket in the step SS4 includes measuring point arrangement, data observation, data analysis and template adjustment. .
The invention has the beneficial effects that: the triangular hanging basket is light and convenient, simple in structure, clear in stress of each rod piece, light in structure self-weight and short in moving period, and is very suitable for municipal engineering continuous beam bridge cantilever cast-in-place construction. And (4) checking the design of the hanging basket by using finite element software, and quickly adjusting and optimizing according to a checking result. And simulating the prepressing of the hanging basket by using finite element software and comparing the prepressing with an actual measurement result to provide a theoretical basis for a prepressing structure. Finite element software is used for simulation analysis, and the hanging basket state is adjusted in time through actual measurement data of each section of box girder, so that the line shape of the bridge is effectively controlled, and the management and control means of 'control in advance, adjustment in advance and conclusion after the fact' are fully implemented.
Detailed Description
The invention is further illustrated below:
the triangular light hanging basket adopted by the patent consists of 6 parts, namely a bearing system, a template system, a suspension system, an anchoring system, a walking system and a construction platform. The bearing system is a main stress structure of the hanging basket and consists of two triangular main trusses and a horizontal connecting system. The triangular main truss consists of a main beam, a front inclined pull rod, a rear inclined pull rod and a vertical rod; the two diagonal draw bars are connected with the main beam through pin bosses at the bottom of the bar piece in a pin joint mode, and the top of the bar piece is bolted through high-strength bolts and connecting steel plates; the two main trusses are connected into a whole through a horizontal connecting system. The template system mainly comprises a bottom die, a side die, an end die and an inner die. The bottom die consists of a bottom die template, a bottom die longitudinal beam, a first lower cross beam and a second lower cross beam, and is used for directly bearing the weight of the section concrete and providing an operation platform for the construction procedures of erecting a die, binding reinforcing steel bars, pouring concrete and the like. The side mould is a truss type integral steel mould and consists of a side mould bracket formed by welding profile steel and a steel plate paved and welded on the side mould bracket. The internal mold consists of an open-type internal mold frame and a self-made combined steel mold paved on the open-type internal mold frame. The inner die frame is formed by processing section steel, a sliding sleeve is arranged below the inner die frame, and the hand chain block can be moved in place along the inner sliding beam. The end mould is a high-density plate, and square wood of 10cm multiplied by 10cm is used as a stiffening rib.
The suspension system comprises a front upper cross beam, a front long suspender, a rear short suspender and the like, and is mainly used for transmitting the self weight of the template system, the section concrete and other construction loads to the hanging basket bearing system and the box girder section after pouring. The anchoring system is arranged at the rear ends of the two main trusses, and the bearing system is fixed on the poured box girder segment through the rear anchor beam, the finish-rolled deformed steel bars and the jacks and is used for balancing the overturning moment generated when the concrete is poured. The walking system comprises a track, a front support, a reverse buckle wheel and traction equipment. When the hanging basket travels, the front support slides on the top surface of the track, and the left-hand thread wheel connected with the rear node is buckled on the flange of the I-shaped steel to travel. The traveling of the cradle is realized by pulling the cradle to move forwards by 2 chain blocks of 100KN, and driving the bottom die platform and the outer die to move forwards in place simultaneously, and the overturning force in the moving process of the cradle is transmitted to the rail by the left-hand wheel and then transmitted to the vertical prestressed tendons of the box girder. Each set of hanging basket is provided with 7 working platforms: the front upper cross beam is provided with 1 suspender length adjusting platform; 1 working platform is arranged below the front lower beam and in front of the beam section to be cast; 1 rear anchor working platform is arranged below the rear lower cross beam; the outer sides of the outer side moulds are respectively provided with 1; two ends are respectively provided with 1 tensioning working platform. The working platform can be provided with a handrail, a railing and a protective net according to the requirement of construction safety.
The method comprises the steps of calculating a triangular light hanging basket, adopting bridge special finite element software Midas Civil to match simulation and analysis, dispersing the light hanging basket into a plurality of units according to the aspects of geometric shape, load distribution, material characteristics and the like according to the structural characteristics of a bridge, arranging nodes, boundary lines or boundary surfaces of the units of a finite element model at corresponding discontinuous positions in the dispersing process, adopting A3 steel for main rods of the triangular light hanging basket, adopting 2I40a steel for main girders of a main truss, adopting two Q345 steel plates with 27.4cm in width inside 2[32b steel channels for diagonal draw bars, adopting 2[40b steel plates for vertical poles, adopting a truss structure for vertical pole plane connection systems, adopting I20a steel for upper and lower chords, adopting ∠ 100 × 63 × 10 steel for web poles, adopting 2I63 steel for front and rear and lower cross beams, adopting 2I40 steel channels 40a for bottom die longitudinal beams, and adopting I30 steel for finish rolling 32 threaded steel suspension rods.
The self weight of the hanging basket is 90T, and the self weight of the box girder segment is selected according to the No. 1 block 176.5T of the heaviest segment. The box girder is prestressed reinforced concrete and the weight value of the box girder is 26kN/m3The load of each bearing beam is determined according to the height of the box girder concrete section correspondingly born by each bottom longitudinal beam and each inner and outer sliding beam, the cross section of the 1# block is divided into 5 areas, the area of each area is the linear load applied to the hanging basket, the flange plate is 0.885kN/m, the outer web plate is 2.27kN/m, the middle web plate is 2.44kN/m, and the top of the hanging basket isThe plate was 1.67kN/m and the bottom plate was 2.09 kN/m.
The front and rear diagonal rods of the single-truss main truss are connected with the upright stanchions by double bolts, and are set as rigid domain connection for reducing errors, and the node deviation amount is set according to the actual situation; when the finish-rolled deformed steel bar adopted by the suspender is connected with the front upper beam or the front lower beam, the redundant restraint is released, and the calculation is carried out according to the condition that only the pull rod piece is used
Checking and calculating the concrete pouring state: the diagonal draw bar of the main truss has the largest tensile stress, sigmamax＝77.6MPa＜[σ]140MPa, meets the requirement. In terms of the whole hanging basket, the front lower cross beam has larger absolute displacement due to the additional deformation of the front long suspension rod besides the accumulated deformation value of the main truss applying load, and the maximum displacement fmax is 12.0mm < L/400 is 13000/400 is 32.5 mm; the relative maximum displacement of the bottom die longitudinal beam relative to the front lower cross beam is 7mm, and the requirements are met.
Checking and calculating the result of the walking state: the front and rear lower beams only have two ends of hanging points when traveling, bottom die load is loaded on the front and rear lower beams according to uniformly distributed load, the strength of the welded box-shaped section beam meets the requirement through calculation, and the hanging basket in a traveling state is mainly controlled by deformation displacement. The maximum displacement is as follows: f. ofmax25.3mm < L/400 13000 ÷ 400 ÷ 32.5mm, meets the requirements.
The assembly of the hanging basket comprises the following steps:
and (5) installing a walking track. And a walking track is arranged above two outer side webs of the bridge close to the vertical prestressed tendons. The vertical prestressed tendons need to extend out of the bridge floor by about 120-140 mm to guarantee that the walking track can be anchored, meanwhile, the distance between the center lines of the walking track is 622 mm (the deviation is less than or equal to 2mm) and the two track surfaces are kept horizontal (the height difference unevenness is less than or equal to 1mm), and the walking track is anchored by using an anchorage device after recheck is correct.
And (5) installing the main truss and accessories thereof. Firstly, the movable support is installed on a walking track according to a designed position, then a main beam of the main truss is hung at a working position, the rear part of the main truss is supported by a sleeper to be flat and stable, the flatness of the main beam is ensured, and finally the main beam is anchored by finish-rolled deformed steel bars. After the vertical rods are installed, the four directions of the vertical rods are pulled by 4 parts of 3t chain blocks, then the horizontal connecting system, the rear inclined rods and the front inclined rods are sequentially installed, and after one group of main trusses are installed, the other group of truss sheets are installed
Assembling the suspender and the bottom die platform. And hanging a front upper cross beam at a preset position at the front end of the main truss, and lifting the bottom die platform through the front and rear suspension rods and the jack.
Assembling side forms and a construction platform. Assembling the side die and the roller carrier on the working position of the sliding beam, then spot-welding the wing die on the sliding beam, and welding a stop block at the tail of the sliding beam to prevent the hanging basket from sliding out of the track; and then the rear anchor is hoisted to a working position, the rear anchor is hoisted by finish-rolled deformed steel bar, the front part of the sliding beam is hoisted by a hoisting rod before the sliding beam is installed, and finally the construction platform is assembled.
Prepressing of hanging basket
Purpose of prepressing
After the hanging basket is assembled, a load test is carried out to determine the actual bearing capacity of the hanging basket and the deformation condition under the action of the load of the beam section. During load test, equivalent loading is carried out according to the load of the beam section with the most adverse stress of the cradle in construction, the elastic deformation and the inelastic deformation values of the cradle are measured and used as reference data during cantilever section formwork erection, and a design calculation diagram and technical parameters of the cradle are verified.
Prepressing mode
And on site, the concrete blocks and the sand bags are used as pre-pressing loads, the sand bags are weighed before entering a field, and water immersion is strictly forbidden. The load test is carried out by loading in 5 stages, namely loading according to 30%, 60%, 80%, 100% and 120% respectively by taking the final box girder segment (the No. 1 block 175.5T) as a base number, and unloading after the final box girder segment is stabilized for 24 hours after the 120% loading is finished. The observation point is arranged at the front end of the cradle bottom die (namely the advancing direction of the cradle bottom die), the elevation of the cradle template corresponding to the observation point is measured according to the selected measurement point before loading, when loading is carried out for 30%, 60%, 80%, 100% and 120% according to the loading mode, then the settlement amount and the average change value of each loaded point are calculated, and meanwhile, the elastic deformation value and the inelastic deformation value of the cradle are calculated according to the measured data.
The traveling of the hanging basket comprises three steps of traveling preparation, hanging basket traveling and hanging basket anchoring.
Walking preparation: and after the box girder segment prestressed beam tensioning and grouting are finished, the walking preparation work of the outer die, the inner die sliding beam falling, the bottom basket die and the like is finished. The construction procedure of the separation of the inner and outer die sliding beams is as follows: dismantling the split bolt → loosening the front and rear suspension rods of the sliding beam → installing the suspension rods of the sliding beam rolling suspension brackets → dismantling the rear suspension rods of the inner and outer die sliding beams. The construction procedure of demoulding the bottom basket is as follows: releasing the rear anchoring of the bottom basket → loosening the lateral supporting bolts of the outer mold → loosening and descending the front and rear suspenders of the bottom basket.
Hanging basket walking: firstly, measuring and lofting, determining the position of a walking track, leveling the top surface of the constructed beam section, paving a steel sleeper and a track on the top surface, and locking the walking track. Loosening the rear support of the hanging basket and finely tying a threaded steel bar anchor rod to enable a hook plate of the rear support of the hanging basket to be barbed on a traveling rail, loosening front and rear suspenders of the inner mold and the outer mold and front and rear suspenders of the bottom mold frame, and hanging a rear cross beam of the bottom mold frame on a traveling beam of the outer mold by using 2 10-t chain blocks. And (5) removing the connection between the suspender and the bottom die support, and removing the anchoring screw at the rear end of the truss. When the hanging basket travels, the chain block is installed at the front end of the hanging basket rail, the moving position of the front support is marked, and the baffle is additionally arranged at the end head to prevent the hanging basket from moving over. When the hanging basket moves forwards, the rear anchor is installed at the front fulcrum, and the finish rolling thread of the rear anchor does not need to be screwed down. The rear side of the hanging basket is connected with the main beam through a hoist, and the hoist is slowly loosened during moving. And 2, using 10t chain blocks to slowly pull the main truss to move forward, so that the main truss, the bottom die and the outer die move forward together, and ensuring synchronization.
Anchoring the hanging basket: after the moving in place, the rear support of the cradle is anchored, and the rear suspender is installed to suspend the bottom die frame. And removing a rear suspension rod on the outer mold walking beam, moving the suspension bracket to the reserved hole of the top plate of the previous beam section, connecting the suspension bracket with the suspension rod, and moving the other suspension bracket to the previous beam section by the same method.
Adjusting the hanging basket: in the preparation stage of cantilever cast-in-place construction of a bridge, a calculation model established by finite element software is utilized, the calculation is gradually carried out to an ideal bridge forming state according to the original design data and the actual construction conditions of the bridge based on the principle of self-adaptive control, and then the calculation is compared and analyzed with the actual construction state to give the elevation of the vertical mold in the next stage. And (3) measuring point arrangement: and (3) arranging control points on each box girder segment by utilizing phi 14 steel bar pre-embedding, wherein the height of the control points is required to be 10cm higher than the surface of a top plate so as to measure the space displacement deformation value of each segment of box girder construction. And (3) data observation: the construction observation is carried out in a time period with stable temperature before sunrise every morning. Template adjustment: after the hanging basket is in place, the hanging basket is anchored in time, and the procedures are as follows: installing a main truss rear anchor → releasing the connection between the main truss walking trolley and the main truss → locking the main truss rear anchor → installing a hanging basket rear suspender → lifting the front suspender and the rear suspender by adopting a jack → adjusting the elevation of the vertical mold according to a linear control command → adjusting to a preset elevation → locking the front suspender → applying pretightening force to the rear suspender and the outer sliding beam suspender.
The invention discloses a finite element analysis method for triangular light hanging basket construction, which specifically comprises the following steps:
SS1, adopting an O # block support method to carry out cast-in-place construction on the pier beam and carrying out temporary consolidation on the pier beam;
SS2, optimally designing and installing the triangular light hanging basket by using finite element software;
SS3, analyzing the rationality of the prepressing structure of the installed triangular light hanging basket by adopting finite element software;
SS4, adjusting the bottom and side molds of the hanging basket;
SS5, constructing a reinforcement prestress duct bound to the bottom and the web plate of the hanging basket;
SS6, mounting the internal mold of the hanging basket;
SS7, constructing a prestressed duct for binding steel bars on a top plate of the hanging basket;
SS8, pouring concrete into the bridge, then manufacturing a test block, and curing the concrete;
SS9, prestressed tensioning and pore canal grouting of the bridge;
and SS10, the hanging basket is moved forward to be in place, and then the folding section is constructed.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (6)
1. The construction method of the finite element analysis software matched with the triangular hanging basket is characterized in that: the method specifically comprises the following steps:
SS1, adopting an O # block support method to carry out cast-in-place construction on the pier beam and carrying out temporary consolidation on the pier beam;
SS2, optimally designing and installing the triangular light hanging basket by using finite element software;
SS3, analyzing the rationality of the prepressing structure of the installed triangular light hanging basket by adopting finite element software;
SS4, adjusting the bottom and side molds of the hanging basket;
SS5, constructing a reinforcement prestress duct bound to the bottom and the web plate of the hanging basket;
SS6, mounting the internal mold of the hanging basket;
SS7, constructing a prestressed duct for binding steel bars on a top plate of the hanging basket;
SS8, pouring concrete into the bridge, then manufacturing a test block, and curing the concrete;
SS9, prestressed tensioning and pore canal grouting of the bridge;
and SS10, the hanging basket is moved forward to be in place, and then the folding section is constructed.
2. The finite element analysis software matched triangular hanging basket construction method according to claim 1, which is characterized in that: and collecting data of the construction process in the steps SS4 to SS10, establishing a finite element analysis model according to the collected construction data, collecting measured data, comparing a simulation value in the model with the collected measured value to modify a control parameter, and simulating step by step according to the construction process again to give an elevation and a midline adjustment value.
3. The finite element analysis software matched triangular hanging basket construction method according to claim 1, which is characterized in that: the assembling of the hanging basket in the step SS2 comprises the installation of a walking track and the installation of a main truss and accessories thereof, wherein the walking track is arranged above two outer side webs of the bridge and close to the position of the vertical prestressed tendon; the vertical prestressed tendons need to extend out of the bridge floor by 120-140 mm to ensure that the walking track can be anchored, meanwhile, the center line spacing of the walking track is 622 mm and the deviation is less than or equal to 2mm, the two track surfaces are kept horizontal, the height unevenness is less than or equal to 1mm, and the walking track is anchored by using an anchorage device after rechecking is correct; the main truss and the installation method of the accessories of the main truss are that the movable support is installed on a walking track according to the designed position, then a main beam of the main truss is hung at the working position, the rear part of the main truss is supported and supported stably by a sleeper, the main beam is flat and straight, then the main beam is anchored by finish rolling deformed steel bars, after the vertical rods are installed, the 4 parts of 3t chain blocks are used for pulling the vertical rods in four directions, then the horizontal connecting system, the rear inclined rods and the front inclined rods are sequentially installed, and after one group of main trusses is installed, the other group of truss sheets are installed.
4. The finite element analysis software matched triangular hanging basket construction method according to claim 1, which is characterized in that: the step SS3 pre-pressing mode is that a concrete block and a sand bag are used as pre-pressing loads, the sand bag is weighed before entering a field, water immersion is strictly forbidden, load tests are loaded in 5 levels, namely, according to the final box girder segment as a base number, the final box girder segment No. 1 block 175.5T is loaded according to 30%, 60%, 80%, 100% and 120% respectively, and is unloaded after 120% loading is completed and is stabilized for 24 hours.
5. The finite element analysis software matched triangular hanging basket construction method according to claim 1, which is characterized in that: the traveling of the hanging basket comprises three steps of traveling preparation, hanging basket traveling and hanging basket anchoring; and the walking preparation is to finish the falling of the sliding beam of the outer die and the inner die and the bottom basket after the tensioning and the mud jacking of the stress beam of the box girder segment are finished.
6. The finite element analysis software matched triangular hanging basket construction method according to claim 1, which is characterized in that: the adjustment of the hanging basket in the step SS4 comprises measuring point arrangement, data observation, data analysis and template adjustment.
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