CN105133841A - Spatial curved surface steel structure pipe truss roof installation construction method - Google Patents
Spatial curved surface steel structure pipe truss roof installation construction method Download PDFInfo
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Abstract
A spatial curved surface steel structure pipe truss roof installation construction method relates to the technical field of a building construction method. The construction method comprises the following steps of elevating a scheme, making preparation for the construction, measuring and setting out, tidying a pre-buried iron member, setting up an all-around scaffold, checking and accepting a main and secondary trusses, installing the main and secondary trusses, installation ridges and stress sheets, detaching the whole, checking and accepting after main body installation, installing a roof panel plate and checking and accepting the whole. Finite element modeling for a non-linear construction phase can be achieved; construction scheme safety is evaluated according to stimulation check of component stress and strain during the construction, so practical construction can be guided; strain displacement can be monitored during the construction; real-time adjustments can be conducted to components, so construction precision can be improved and building cost can be reduced.
Description
Technical field
The present invention relates to the technical field of construction techniques.
Background technology
The installation of space curved surface steel-structure tube truss, compared with common steel work, all has quite high difficulty from aspects such as component detail drawing Deepen Design, intersection node weld, the blanking of irregular roof panel, the manufacture and installation of tubular truss.The installation of traditional space curved surface steel-structure tube truss has following shortcoming: 1, construction needs to set up full hall scaffold, and operation is loaded down with trivial details, long in time limit, quality not easily ensures; 2, the assembled welding of tubular truss is all carried out in high-altitude, and difficulty of construction is large, and assembled welding quality is wayward, and constructor's safety assurance is poor, easily high fall accident occurs; 3, the cumulative errors that produce in the making, installation process of degradable member of tubular truss component are comparatively large, and finally often needing does over again or do larger change to component just can enable structure close up smoothly, wastes time and energy; 4, space curved surface roof system is complex-shaped, and roof panel mostly is fan-shaped and the geomery of every block fanning strip differs, and setting-out difficulty is very large, adopts traditional construction technique often to cause the problems such as setting-out size inaccuracy, waste of material.
Summary of the invention
The object of the invention is to provide a kind of finite element modelling can carrying out the non-linear construction stage, the stress and strain of each component in work progress is investigated by simulation, the safety of assessment constructure scheme, instruct actual installation work progress, work progress carries out strain displacement monitoring, and can adjust in real time member designs, improve construction precision, reduce the space curved surface steel-structure tube trussed roof installation engineering method of construction cost simultaneously.
Space curved surface steel-structure tube trussed roof installation engineering method of the present invention, comprises the steps:
The first step: constructure scheme is assessed:
With MIDAS software, the finite element modelling of non-linear construction stage is carried out to constructure scheme before formal construction, investigated the stress and strain of each component in work progress by simulation, the safety of assessment constructure scheme; Simulation is assessed is allowed for access the construction stage after confirming constructure scheme safety; Construction stage according to sunykatuib analysis result, should carry out ess-strain monitoring to main member;
Second step: preparation of construction:
Grading roads and fabricating yard, loop wheel machine travel adopt pad steel subgrade case or sleeper smooth solid, to ensure safety in loop wheel machine load;
3rd step: surveying setting-out:
Select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge, coordinate steel ruler, angle square adopts method of polar coordinates to carry out the setting-out work of tubular truss suspension column, intermediate support and lattice column; At the good main couple top-bottom chord of main couple column root-plate subscript with regard to circle of position size, intermediate support base plate ejects axial location in place, facilitates main couple installation in position;
4th step: arrange embedded iron parts:
According to surveying setting-out, check the embedded iron parts position of relevant position on the concrete basis of tubular truss suspension column, intermediate support and construction steel pile or grandstand; The ironware that axial location and absolute altitude do not meet the demands is arranged, makes its deviate in allowed band;
5th step: install steel pile:
The lattice column carrying out every Pin main couple according to steel work main couple cantilever end lower chord end opening to the height at ± 0.000 place of design is gone forward side by side line label process.During installation, select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge corrects the absolute altitude of lattice column, angle, verticality, correct the good cable rope of post-tensioning;
6th step: set up full hall scaffold:
The demand set up according to installing steel truss of scaffold, set up into stairstepping, first floor to a 7.5 meter absolute altitude sets up platform, the second layer to a 11.5 meter absolute altitude sets up platform, third layer to a 15.2 meter absolute altitude sets up platform, and the 4th layer to 17 meters absolute altitudes set up platform, finally set up to absolute altitude 20.6m, scaffold upright rod is spacing 1000mm in length and breadth, step pitch 1800mm; Scaffold should reserve position at string shape main couple place in place;
7th step: check and accept primary and secondary truss:
According to corresponding specifications such as designing requirement and welding quality examinations, primary and secondary truss being carried out an acceptance inspection, can lift by checking and accepting;
8th step: install primary and secondary truss:
First carry out the installation of two Pin main couples, the segmentation carrying out annular jack truss is afterwards installed, and then installs by Pin the installation that main couple also carries out annular jack truss piecemeal in the mode of looping; Before formal lifting, carry out examination hang, to guarantee the safety lifted;
9th step: install rib and foil gauge:
The installation such as purlin and roofing is carried out again after acceptance(check); Steel rib is divided into main rib and time rib, and model is respectively C250 × 80 × 20 × 3.0, C250 × 70 × 20 × 2.5, and material is Q345B;
In observation process, the progress along with truss installa-tion is synchronously carried out by the installation of strain measuring point sensor; In order to avoid the damage of strain gauge, the installation of strain transducer needs to carry out after the main purlin installation of each truss structure; Vibrating wire sensor adopts AB glue method to be fixed on measuring point surface, is firm pasting, improves adhesion stress, steel structure surface needs first to polish with sanding machine, then uses AB glue bond, requires dry tack free during bonding, can body structure surface be firmly attached to after 5 ~ 7min, transmit corresponding local distortion; Meanwhile, in order to prevent natural conditions severe at the scene to the adverse effect of glue performance, silica gel and external environment condition is used to isolate in the outside of AB glue; The data wire of each measuring point needs to concentrate binding, under along steelframe surface, is placed in the position being convenient to measure, so that concentrate reading, accelerates test process;
Tenth step: overall unloading:
Laced of battened compression member (hereinafter referred to as steel pile) adopts overall unloading method to remove; The discharging method of steel-structure tube truss: assume unified command of the jacking simultaneously of 12 hydraulic jack, each top lifting height is 1mm, jack piston can be masked as foundation.Should be test twice when jack comes to nothing under main couple cantilever end, to obtain the experience of synchronization of jacking up before formal jacking; After first time jacking 1mm, should check that whether the situations such as jack, pad, steel pile are good; As found, jack deflection and foundation settlement are out of shape and other abnormal conditions, must could continue jacking work after treatment; As found, foundation settlement is out of shape, and can add wedge shape iron pad treatment; Jack divides three subsynchronous jackings, each synchronization of jacking up 1mm, and namely accumulative jacking 3mm completes jacking work, i.e. every jacking 1mm, should observe the middle concrete capital weld seam of 12 Pin main couples and jack truss and main couple weld seam situation, prevent weld seam drawing crack from destroying; After second time synchronization of jacking up, find that the lower edge of steel pipe main couple has departed from pedestal parallels, then without the need to third time synchronization of jacking up;
The ess-strain value of each test point is noted in uninstall process, as found in uninstall process, certain monitoring point ess-strain exceedes normal value, unloading should be stopped immediately, check component and the weld seam situation of corresponding site, analyze the extraordinary reason of ess-strain, take corresponding measure that ess-strain is reached after in normal range (NR) and can continue unloading;
11 step: check and accept after main body installation:
Please monitor unit, supervisor and owner after self-inspection is qualified to carry out an acceptance inspection to agent structure according to corresponding acceptance criteria; The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis;
12 step: install roof panel:
12.1, utilize AUTOCAD, PRO-E software, respectively the hemispheroidal roof panel of ellipse is deepened and decomposed, the fanning strip upper and lower opening size drawn is compared and determines, draw final fanning strip upper and lower opening size;
12.2, determine according to fanning strip upper and lower opening size the width dimensions buying roof color steel plate, in order to ensure that inside and outside roof panel, perception is consistent, all color steels have all carried out two-sided pad pasting;
12.3, after roof panel material is transported to building site, before cutting, safety technics has been carried out to roof panel processing and has told somebody what one's real intentions are, adopted roof panel automatic slitting machine, one piece of roof panel is divided into the equal fanning strip material of two block lengths;
12.4, the roof panel material that automatic slitting machine processes is put into roofing contour plate forming machine, forming roof panel;
12.5, first test is carried out to the roof panel suppressed locally round as a ball, round as a ball one time of every local, check the round as a ball arc size in local of a roof panel, and progressively adjust the round as a ball size of spheronizator, until after the correct round as a ball size in roof panel local, check errorless after, fix the round as a ball size of spheronizator, then carry out large batch of round as a ball;
12.6, in order to ensure perception inside and outside roof panel, when making and install, in links, take safeguard measure, protecting is the roof panel of finished product as far as possible;
13 step: overall examination:
Roof panel installs each roof system of rear reading and installs rear elder generation and carry out self-inspection by unit in charge of construction, please monitor unit, supervisor and owner and carry out entirety according to corresponding acceptance criteria and check and accept after self-inspection is qualified; The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis.
Reasonable, the 8th step of the present invention is installed primary and secondary truss and is comprised the steps;
The lifting stability of 8.1 checking computations main couples:
Main couple cross section is triangle, the second moment of area I=9490cm of the smallest cross-sectional φ 299 × 10 of the upper and lower chord member of main couple
4, colligation suspension centre any position on truss all can meet the lifting stability requirement of main couple in plane;
8.2 install a Pin main couple:
An arc main couple is hung in loop wheel machine rear examination in place, and apply 4 suspension centres lifting arc main couples, main couple of controlling well does not overturn, and examination is hung and appropriate to the occasion main couple hung ground about 50cm; In hoisting process, by controlling to make main couple first meet the absolute altitude on lattice column top, then meeting the absolute altitude at main couple suspension column place, finally meeting the absolute altitude of intermediate support; After main couple is in place, by total station survey absolute altitude, angle, correct the indices such as verticality with roof truss adjuster;
8.3 is temporary fixed:
Adopt and respectively arrange twice cable wind rope as temporary fixed in main couple both sides, with cable wind rope, truss is made triangle anchorage and tilt to both sides to avoid truss, screw pre-embedded bolt nut, then crane breaks off relations, main couple installation;
8.4 install the 2nd Pin main couple:
2nd Pin main couple is installed with a Pin main couple erection procedure identical, and should install jack truss between two Pin main couples, suspension hook can break off relations;
8.5 segmental hoisting annular jack truss:
After 2nd Pin main couple installation, in order to ensure the stability of structure, carry out the installation of annular jack truss immediately; Because jack truss is a Pin variable cross-section triangular ring truss, three strings pipe two ends are all one and pass through the U-shaped cutting mouth in face mutually, main couple installation is reverse V-shaped, little large below above, so conveniently install, the lifting of annular jack truss is by first up and then down order, and namely first install a Pin above, rear installation is a Pin below;
8.6 welding:
Lift annular jack truss in place after be welded and fixed, carry out successively; Welding Testing according to scene is reported, by selecting suitable welding process flow, operating type and the sequence of operation in construction, and constantly adjusting process parameter;
8.7 ultrasonic testing/ ultrasonic examinations:
After welding, carry out ultrasonic testing/ ultrasonic examination inspection after cooling to room temperature; It is I level that welding line joint quality through flaw detection must meet all rod member butt welds, bearing II level, and other weld seam is III level quality specifications;
8.8 measure mounting structure space coordinates:
Topcon electronic total station and J2 micrometer instrument, SD3 level gauge is selected to measure the primary and secondary truss key point space coordinates of having installed, main measurement main couple is encorbelmented the space coordinates of end, primary and secondary truss welding node, and compare with design load, draw construction error;
8.9 carry out design modifying according to construction error:
According to the error in practice of construction process, with PRO-E software, Deepen Design is re-started to non-installation component, and carry out blanking, welding according to new Deepen Design figure, make primary and secondary truss can be assembled smoothly;
8.10 carry out all the other primary and secondary truss installa-tion successively:
The installation of all the other primary and secondary truss is carried out according to above-mentioned steps; In order to reduce the impact of thermal stresses on structure, select to install last a few Pin annular jack truss at dusk, the entirety realizing roof system tubular truss steel structure system is closed up.
The present invention adopts technique scheme, and compared with prior art tool has the following advantages:
1, with MIDAS software, security evaluation is carried out to constructure scheme before construction, this engineering method has carried out the finite element modelling of non-linear construction stage with MIDAS software to constructure scheme before construction, the stress and strain of each component in work progress is investigated by simulation, thus the safety of assessment constructure scheme, instruct actual installation work progress.
2, work progress carries out strain displacement monitoring, according to MIDAS software before construction to the analysis result of roof construction scheme, this engineering method has been carried out ess-strain monitoring to each key position, has been carried out displacement monitoring to each main couple cantilever end in work progress, thus ensure that the stress that the various rod members of construction stage bear and distortion conform to designing a model.
3, according to construction error, member designs is adjusted in real time, because tubular truss component all likely exists error in the making of degradable member, the accuracy of installation process etc., this engineering method tightly monitors the position coordinates of the primary and secondary truss of installation in work progress, compare with design load, obtain construction error in time.Then utilizing PRO-E software to carry out adjustment in real time to non-installation component design, to correct previous construction error, makes roof structure to close up smoothly.
4, utilize AUTOCAD, PRO-E software to carry out setting-out to various difformity roof panel, space curved surface roof system build is complicated, and roof panel mostly is fan-shaped and the geomery of every block fanning strip differs.And some engineering selects harder color steel as roof panel material, and setting-out difficulty is very large.This engineering method, according to existing market material, utilizes AUTOCAD, PRO-E software, deepens and decomposes respectively to round hemispheroidal roof panel, draws final fanning strip upper and lower opening size, not only increases construction precision, reduce construction cost simultaneously.
Accompanying drawing explanation
Fig. 1 is construction method block diagram of the present invention.
Detailed description of the invention
As shown in Figure 1, space curved surface steel-structure tube trussed roof installation engineering method of the present invention comprises the steps:
The first step: constructure scheme is assessed:
With MIDAS software, the finite element modelling of non-linear construction stage is carried out to constructure scheme before formal construction, investigated the stress and strain of each component in work progress by simulation, thus the safety of assessment constructure scheme.Simulation is assessed is allowed for access the construction stage after confirming constructure scheme safety.Construction stage according to sunykatuib analysis result, should carry out ess-strain monitoring to main member.
Second step: preparation of construction:
Grading roads and fabricating yard, loop wheel machine travel must be smooth solid, can adopt pad steel subgrade case or sleeper, to ensure safety in loop wheel machine load.
3rd step: surveying setting-out:
Select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge, coordinate steel ruler, angle square etc. adopt method of polar coordinates to carry out the setting-out work of tubular truss suspension column, intermediate support and lattice column.At the good main couple top-bottom chord of main couple column root-plate subscript with regard to circle of position size, intermediate support base plate ejects axial location in place, facilitates main couple installation in position.
4th step: arrange embedded iron parts:
According to surveying setting-out, check the embedded iron parts position of relevant position on the concrete basis of tubular truss suspension column, intermediate support and construction steel pile or grandstand.The ironware that axial location and absolute altitude do not meet the demands is arranged, makes its deviate in allowed band.
5th step: install steel pile:
The lattice column that the steel work main couple cantilever end lower chord end opening provided according to designing institute to the height at ± 0.000 place carries out every Pin main couple is gone forward side by side line label process.During installation, select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge corrects the absolute altitude of lattice column, angle, verticality, correct the good cable rope of post-tensioning.
6th step: set up full hall scaffold:
The demand set up according to central network court installation steel truss of scaffold, set up into stairstepping, first floor to a 7.5 meter absolute altitude sets up platform, the second layer to a 11.5 meter absolute altitude sets up platform, third layer to a 15.2 meter absolute altitude sets up platform, and the 4th layer to 17 meters absolute altitudes set up platform, finally set up to absolute altitude 20.6m, scaffold upright rod is spacing 1000mm in length and breadth, step pitch 1800mm.Scaffold should reserve position at string shape main couple place in place;
7th step: check and accept primary and secondary truss:
According to corresponding specifications such as designing requirement and welding quality examinations, primary and secondary truss being carried out an acceptance inspection, can lift by checking and accepting.
8th step: install primary and secondary truss:
Central network court surrounds spheroid Operation Centre by 12 Pin main couples and 4 circle time truss, and be that 37 meters of have 12 concrete posts as the middle support column of whole spheroid at radius, single Pin main couple weighs 15.7 tons, and loop wheel machine adopts 110 tons of mobile cranes to install.
After this is surrounded to the analysis of sphere structure by steel pipe truss, decision installation steps are as follows: the installation first carrying out two Pin main couples, the segmentation carrying out annular jack truss is afterwards installed, and then installs by Pin the installation that main couple also carries out annular jack truss piecemeal in the mode of looping.Before formal lifting, carry out examination hang, to guarantee the safety lifted.
The lifting stability of 8.1 checking computations main couples:
Because the span of main couple is greatly to more than 40m, due to during lifting under deadweight and dynamic action, therefore the installation stability of main couple should be ensured.The second moment of area I=9490cm of the smallest cross-sectional φ 299 × 10 of the upper and lower chord member of main couple
4, colligation suspension centre any position on truss all can meet the lifting stability requirement of main couple in plane.For main couple out plane stability, because the main couple cross section of this engineering is triangle, therefore out plane stability all can meet without the need to checking.
8.2 install a Pin main couple:
An arc main couple is hung in loop wheel machine rear examination in place, and apply 4 suspension centres lifting arc main couples, main couple of controlling well does not overturn, and examination is hung and appropriate to the occasion main couple hung ground about 50cm.In hoisting process, by controlling to make main couple first meet the absolute altitude on lattice column top, then meeting the absolute altitude at main couple suspension column place, finally meeting the absolute altitude of intermediate support.After main couple is in place, by total station survey absolute altitude, angle, correct the indices such as verticality with roof truss adjuster.
8.3 is temporary fixed:
Adopt and respectively arrange twice cable wind rope as temporary fixed in truss both sides, with cable phoenix rope, truss is made triangle anchorage and tilt to both sides to avoid truss, screw pre-embedded bolt nut, then crane breaks off relations, main couple installation.
8.4 install the 2nd Pin main couple:
2nd Pin main couple is installed with a Pin main couple erection procedure identical, and should install jack truss between two Pin main couples, suspension hook can break off relations.
8.5 segmental hoisting annular jack truss:
After 2nd Pin main couple installation, in order to ensure the stability of structure, carry out the installation of annular jack truss (segmentation) immediately.Because jack truss is a Pin variable cross-section triangular ring truss, three strings pipe two ends are all one and pass through the U-shaped cutting mouth in face mutually, main couple installation is reverse V-shaped, little large below above, so conveniently install, the lifting of annular jack truss is by first up and then down order, and namely first install a Pin above, rear installation is a Pin below.
8.6 welding:
Lift annular jack truss in place after be welded and fixed, carry out successively.Because weld bond between primary and secondary truss is concentrated, intersection is complicated, and weld time is long, and therefore, the deformation of member that sweating heat causes will have a strong impact on the assembled quality of pestle frame.In order to reduce this impact, the Welding Testing according to scene is reported, with the computational analysis of science for instructing, by selecting suitable welding process flow, operating type and the sequence of operation in construction, and constantly adjusting process parameter.
8.7 ultrasonic testing/ ultrasonic examinations:
After welding, ultrasonic testing/ ultrasonic examination inspection should be carried out after cooling to room temperature.It is I level that welding line joint quality through flaw detection must meet all rod member butt welds, bearing II level, and other weld seam is III level quality specifications.
8.8 measure mounting structure space coordinates:
Topcon electronic total station and J2 micrometer instrument, SD3 level gauge is selected to measure the primary and secondary truss key point space coordinates of having installed, main measurement main couple is encorbelmented the space coordinates of end, primary and secondary truss welding node, and compare with design load, draw construction error.
8.9 carry out design modifying according to construction error:
According to the error in practice of construction process, with PRO-E software, Deepen Design is re-started to non-installation component, and carry out blanking, welding according to new Deepen Design figure, make primary and secondary truss can be assembled smoothly.
8.10 carry out all the other primary and secondary truss installa-tion successively:
The installation of all the other primary and secondary truss is carried out according to above-mentioned steps.In order to reduce the impact of thermal stresses on structure, select to install last a few Pin annular jack truss at dusk, the entirety realizing roof system tubular truss steel structure system is closed up.
9th step: install rib and foil gauge:
The installation such as purlin and roof panel is carried out again after acceptance(check).Steel rib is divided into main rib and time rib, and model is respectively C250 × 80 × 20 × 3.0, C250 × 70 × 20 × 2.5, and material is Q345B.
In observation process, the progress along with truss installa-tion is synchronously carried out by the installation of strain measuring point sensor.In order to avoid the damage of strain gauge, the installation of strain transducer needs to carry out after the main purlin installation of each truss structure.Vibrating wire sensor adopts AB glue method to be fixed on measuring point surface, is firm pasting, improves adhesion stress, steel structure surface needs first to polish with sanding machine, then uses AB glue bond, requires dry tack free during bonding, can body structure surface be firmly attached to after 5 ~ 7min, transmit corresponding local distortion.Meanwhile, in order to prevent the adverse effect of severe at the scene natural conditions (as drench with rain, sunlight penetrate by force) to glue performance, silica gel and external environment condition is used to isolate in the outside of AB glue.The data wire of each measuring point needs to concentrate binding, under along steelframe surface, is placed in the position being convenient to measure, so that concentrate reading, accelerates test process.
Tenth step: overall unloading:
Laced of battened compression member (hereinafter referred to as steel pile) adopts overall unloading method to remove.The discharging method of steel-structure tube truss: assume unified command of the jacking simultaneously of 12 hydraulic jack, each top lifting height is 1mm, jack piston can be masked as foundation.Should be test twice when jack comes to nothing under main couple cantilever end, to obtain the experience of synchronization of jacking up before formal jacking.After first time jacking 1mm, should check that whether the situations such as jack, pad, steel pile are good.As found, jack deflection and foundation settlement are out of shape and other abnormal conditions, must could continue jacking work after treatment.As found, foundation settlement is out of shape, and can add wedge shape iron pad treatment.Jack divides three subsynchronous jackings, each synchronization of jacking up 1mm, and namely accumulative jacking 3mm completes jacking work, i.e. every jacking 1mm, should observe the middle concrete capital weld seam of 12 Pin main couples and jack truss and main couple weld seam situation, prevent weld seam drawing crack from destroying.After second time synchronization of jacking up, find that the lower edge of steel pipe main couple has departed from pedestal parallels, then without the need to third time synchronization of jacking up.
The ess-strain value of each test point is noted in uninstall process, as found in uninstall process, certain monitoring point ess-strain exceedes normal value, unloading should be stopped immediately, check component and the weld seam situation of corresponding site, analyze the extraordinary reason of ess-strain, take corresponding measure that ess-strain is reached after in normal range (NR) and can continue unloading.
11 step: check and accept after main body installation:
Please monitor unit, supervisor and owner after self-inspection is qualified to carry out an acceptance inspection to agent structure according to corresponding acceptance criteria.The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis.
12 step: install roof panel:
12.1, according to existing market material, utilize AUTOCAD, PRO-E software, respectively the hemispheroidal roof panel of ellipse is deepened and decomposed, the fanning strip upper and lower opening size drawn is compared and determines, draw final fanning strip upper and lower opening size.
12.2, determine according to fanning strip upper and lower opening size the width dimensions buying roof color steel plate, in order to ensure that inside and outside roof panel, perception is consistent, all purchase color steels have all carried out two-sided pad pasting.
12.3, after roof panel material is transported to building site, before cutting, safety technics has been carried out to roof panel processing and has told somebody what one's real intentions are, adopted roof panel automatic slitting machine, one piece of roof panel is divided into the equal fanning strip material of two block lengths.
12.4, the roof panel material that automatic slitting machine processes is put into roofing contour plate forming machine, forming roof panel.
12.5, first test is carried out to the roof panel suppressed locally round as a ball, round as a ball one time of every local, check the round as a ball arc size in local of a roof panel, and progressively adjust the round as a ball size of spheronizator, until after the correct round as a ball size in roof panel local, check errorless after, fix the round as a ball size of spheronizator, then carry out large batch of round as a ball.
12.6, in order to ensure perception inside and outside roof panel, when making and install, in links, take safeguard measure, protecting is the roof panel of finished product as far as possible.
13 step: overall examination:
Roof panel installs each roof system of rear reading and installs rear elder generation and carry out self-inspection by unit in charge of construction, please monitor unit, supervisor and owner and carry out entirety according to corresponding acceptance criteria and check and accept after self-inspection is qualified.The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis.
Claims (2)
1. a space curved surface steel-structure tube trussed roof installation engineering method, is characterized in that comprising the steps:
The first step: constructure scheme is assessed:
With MIDAS software, the finite element modelling of non-linear construction stage is carried out to constructure scheme before formal construction, investigated the stress and strain of each component in work progress by simulation, the safety of assessment constructure scheme; Simulation is assessed is allowed for access the construction stage after confirming constructure scheme safety; Construction stage according to sunykatuib analysis result, should carry out ess-strain monitoring to main member;
Second step: preparation of construction:
Grading roads and fabricating yard, loop wheel machine travel adopt pad steel subgrade case or sleeper smooth solid, to ensure safety in loop wheel machine load;
3rd step: surveying setting-out:
Select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge, coordinate steel ruler, angle square adopts method of polar coordinates to carry out the setting-out work of tubular truss suspension column, intermediate support and lattice column; At the good main couple top-bottom chord of main couple column root-plate subscript with regard to circle of position size, intermediate support base plate ejects axial location in place, facilitates main couple installation in position;
4th step: arrange embedded iron parts:
According to surveying setting-out, check the embedded iron parts position of relevant position on the concrete basis of tubular truss suspension column, intermediate support and construction steel pile or grandstand; The ironware that axial location and absolute altitude do not meet the demands is arranged, makes its deviate in allowed band;
5th step: install steel pile:
The lattice column carrying out every Pin main couple according to steel work main couple cantilever end lower chord end opening to the height at ± 0.000 place of design is gone forward side by side line label process.During installation, select Topcon electronic total station and J2 micrometer instrument, SD3 level gauge corrects the absolute altitude of lattice column, angle, verticality, correct the good cable rope of post-tensioning;
6th step: set up full hall scaffold:
The demand set up according to installing steel truss of scaffold, set up into stairstepping, first floor to a 7.5 meter absolute altitude sets up platform, the second layer to a 11.5 meter absolute altitude sets up platform, third layer to a 15.2 meter absolute altitude sets up platform, and the 4th layer to 17 meters absolute altitudes set up platform, finally set up to absolute altitude 20.6m, scaffold upright rod is spacing 1000mm in length and breadth, step pitch 1800mm; Scaffold should reserve position at string shape main couple place in place;
7th step: check and accept primary and secondary truss:
According to the corresponding specification that designing requirement and welding quality are checked and accepted, primary and secondary truss being carried out an acceptance inspection, can lift by checking and accepting;
8th step: install primary and secondary truss:
First carry out the installation of two Pin main couples, the segmentation carrying out annular jack truss is afterwards installed, and then installs by Pin the installation that main couple also carries out annular jack truss piecemeal in the mode of looping; Before formal lifting, carry out examination hang, to guarantee the safety lifted;
9th step: install rib and foil gauge:
The installation such as purlin and roofing is carried out again after acceptance(check); Steel rib is divided into main rib and time rib, and model is respectively C250 × 80 × 20 × 3.0, C250 × 70 × 20 × 2.5, and material is Q345B;
In observation process, the progress along with truss installa-tion is synchronously carried out by the installation of strain measuring point sensor; In order to avoid the damage of strain gauge, the installation of strain transducer needs to carry out after the main purlin installation of each truss structure; Vibrating wire sensor adopts AB glue method to be fixed on measuring point surface, is firm pasting, improves adhesion stress, steel structure surface needs first to polish with sanding machine, then uses AB glue bond, requires dry tack free during bonding, can body structure surface be firmly attached to after 5 ~ 7min, transmit corresponding local distortion; Meanwhile, in order to prevent natural conditions severe at the scene to the adverse effect of glue performance, silica gel and external environment condition is used to isolate in the outside of AB glue; The data wire of each measuring point needs to concentrate binding, under along steelframe surface, is placed in the position being convenient to measure, so that concentrate reading, accelerates test process;
Tenth step: overall unloading:
Laced of battened compression member (hereinafter referred to as steel pile) adopts overall unloading method to remove; The discharging method of steel-structure tube truss: assume unified command of the jacking simultaneously of 12 hydraulic jack, each top lifting height is 1mm, jack piston can be masked as foundation.Should be test twice when jack comes to nothing under main couple cantilever end, to obtain the experience of synchronization of jacking up before formal jacking; After first time jacking 1mm, should check that whether the situations such as jack, pad, steel pile are good; As found, jack deflection and foundation settlement are out of shape and other abnormal conditions, must could continue jacking work after treatment; As found, foundation settlement is out of shape, and can add wedge shape iron pad treatment; Jack divides three subsynchronous jackings, each synchronization of jacking up 1mm, and namely accumulative jacking 3mm completes jacking work, i.e. every jacking 1mm, should observe the middle concrete capital weld seam of 12 Pin main couples and jack truss and main couple weld seam situation, prevent weld seam drawing crack from destroying; After second time synchronization of jacking up, find that the lower edge of steel pipe main couple has departed from pedestal parallels, then without the need to third time synchronization of jacking up;
The ess-strain value of each test point is noted in uninstall process, as found in uninstall process, certain monitoring point ess-strain exceedes normal value, unloading should be stopped immediately, check component and the weld seam situation of corresponding site, analyze the extraordinary reason of ess-strain, take corresponding measure that ess-strain is reached after in normal range (NR) and can continue unloading;
11 step: check and accept after main body installation:
Please monitor unit, supervisor and owner after self-inspection is qualified to carry out an acceptance inspection to agent structure according to corresponding acceptance criteria; The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis;
12 step: install roof panel:
12.1, utilize AUTOCAD, PRO-E software, respectively the hemispheroidal roof panel of ellipse is deepened and decomposed, the fanning strip upper and lower opening size drawn is compared and determines, draw final fanning strip upper and lower opening size;
12.2, determine according to fanning strip upper and lower opening size the width dimensions buying roof color steel plate, in order to ensure that inside and outside roof panel, perception is consistent, all color steels have all carried out two-sided pad pasting;
12.3, after roof panel material is transported to building site, before cutting, safety technics has been carried out to roof panel processing and has told somebody what one's real intentions are, adopted roof panel automatic slitting machine, one piece of roof panel is divided into the equal fanning strip material of two block lengths;
12.4, the roof panel material that automatic slitting machine processes is put into roofing contour plate forming machine, forming roof panel;
12.5, first test is carried out to the roof panel suppressed locally round as a ball, round as a ball one time of every local, check the round as a ball arc size in local of a roof panel, and progressively adjust the round as a ball size of spheronizator, until after the correct round as a ball size in roof panel local, check errorless after, fix the round as a ball size of spheronizator, then carry out large batch of round as a ball;
12.6, in order to ensure perception inside and outside roof panel, when making and install, in links, take safeguard measure, protecting is the roof panel of finished product as far as possible;
13 step: overall examination:
Roof panel installs each roof system of rear reading and installs rear elder generation and carry out self-inspection by unit in charge of construction, please monitor unit, supervisor and owner and carry out entirety according to corresponding acceptance criteria and check and accept after self-inspection is qualified; The ess-strain numerical value of each monitoring point and the deflection data of main couple cantilever end are as one of acceptance basis.
2. space curved surface steel-structure tube trussed roof installation engineering method according to claim 1, is characterized in that above-mentioned 8th step is installed primary and secondary truss and comprised the steps:
The lifting stability of 8.1 checking computations main couples:
Main couple cross section is triangle, the second moment of area I=9490cm of the smallest cross-sectional φ 299 × 10 of the upper and lower chord member of main couple
4, colligation suspension centre any position on truss all can meet the lifting stability requirement of main couple in plane;
8.2 install a Pin main couple:
An arc main couple is hung in loop wheel machine rear examination in place, and apply 4 suspension centres lifting arc main couples, main couple of controlling well does not overturn, and examination is hung and appropriate to the occasion main couple hung ground about 50cm; In hoisting process, by controlling to make main couple first meet the absolute altitude on lattice column top, then meeting the absolute altitude at main couple suspension column place, finally meeting the absolute altitude of intermediate support; After main couple is in place, by total station survey absolute altitude, angle, correct the indices such as verticality with roof truss adjuster;
8.3 is temporary fixed:
Adopt and respectively arrange twice cable wind rope as temporary fixed in main couple both sides, with cable wind rope, truss is made triangle anchorage and tilt to both sides to avoid truss, screw pre-embedded bolt nut, then crane breaks off relations, main couple installation;
8.4 install the 2nd Pin main couple:
2nd Pin main couple is installed with a Pin main couple erection procedure identical, and should install jack truss between two Pin main couples, suspension hook can break off relations;
8.5 segmental hoisting annular jack truss:
After 2nd Pin main couple installation, in order to ensure the stability of structure, carry out the installation of annular jack truss immediately; Because jack truss is a Pin variable cross-section triangular ring truss, three strings pipe two ends are all one and pass through the U-shaped cutting mouth in face mutually, main couple installation is reverse V-shaped, little large below above, so conveniently install, the lifting of annular jack truss is by first up and then down order, and namely first install a Pin above, rear installation is a Pin below;
8.6 welding:
Lift annular jack truss in place after be welded and fixed, carry out successively; Welding Testing according to scene is reported, by selecting suitable welding process flow, operating type and the sequence of operation in construction, and constantly adjusting process parameter;
8.7 ultrasonic testing/ ultrasonic examinations:
After welding, carry out ultrasonic testing/ ultrasonic examination inspection after cooling to room temperature; It is I level that welding line joint quality through flaw detection must meet all rod member butt welds, bearing II level, and other weld seam is III level quality specifications;
8.8 measure mounting structure space coordinates:
Topcon electronic total station and J2 micrometer instrument, SD3 level gauge is selected to measure the primary and secondary truss key point space coordinates of having installed, main measurement main couple is encorbelmented the space coordinates of end, primary and secondary truss welding node, and compare with design load, draw construction error;
8.9 carry out design modifying according to construction error:
According to the error in practice of construction process, with PRO-E software, Deepen Design is re-started to non-installation component, and carry out blanking, welding according to new Deepen Design figure, make primary and secondary truss can be assembled smoothly;
8.10 carry out all the other primary and secondary truss installa-tion successively:
The installation of all the other primary and secondary truss is carried out according to above-mentioned steps; In order to reduce the impact of thermal stresses on structure, select to install last a few Pin annular jack truss at dusk, the entirety realizing roof system tubular truss steel structure system is closed up.
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