CN104631838A - Method for installing abnormal-shaped extremely-large overhung steel truss under process monitoring construction - Google Patents
Method for installing abnormal-shaped extremely-large overhung steel truss under process monitoring construction Download PDFInfo
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- CN104631838A CN104631838A CN201410815251.5A CN201410815251A CN104631838A CN 104631838 A CN104631838 A CN 104631838A CN 201410815251 A CN201410815251 A CN 201410815251A CN 104631838 A CN104631838 A CN 104631838A
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Abstract
The invention discloses a method for installing an abnormal-shaped extremely-large overhung steel truss under process monitoring construction. The installing method includes the steps that a steel structure truss deepening design and structure analysis model is built; steel truss parts are manufactured and pre-assembled, and the manufacturing process and the pre-assembling process are monitored; the steel truss is installed in site in a sectioned mode, and the steel truss installation process is monitored; unloading construction is carried out on the steel truss, and the steel truss unloading process is monitored; loading forming is monitored in the later period after the steel truss is installed in a staged mode; the structure of the steel truss is checked and accepted. The installation technology that a temporary supporting system and altitude spread assembling are combined is adopted, the large-span abnormal-shaped space lattice pipe truss is accurately installed, and the truss is evenly stressed and is not prone to deformation in the installation process. Heat accumulation, welding stress and welding deformation are prevented with the altitude spread roof-member method.
Description
Technical field
The present invention relates to International Classification of Patents E04B buildings in general structure or B23K welding building technology, the special-shaped super large Steel Cantilever Truss mounting method especially under process monitoring construction.
Background technology
At present, Long-Span Steel Space Structures is widely used in China, such as venue structure, high ferro station canopy etc.The steel work of these types is when constructing, and traditional construction method adopts big machinery lifting.Steel build build for two pipes, three pipes and the chord member of the tube truss structure that is combined into of multitube, the group of web member stand.The execution conditions arranged due to rod member at welding fabrication are different, and precision is different and vary in weight.Be unfavorable for that batch production makes.Super large for this complexity is encorbelmented the heavy steel truss structure of abnormity, in work progress, simulation analysis of computer and work progress synchronization monitoring are incorporated, the structured testing technology of practicality, on-the-spot computational analysis technology, modern control technology are applied to construction, form Calculation Anaysis for Tunnel Structure, monitoring and feedback control system in conjunction with work progress.By the structured testing of job site, follow the tracks of computational analysis and draw rational FEEDBACK CONTROL measure, policy-making technical basis is provided to structure in work progress " power " and the change of " shape ", also the distortion of process Elastic and rigid body displacement problem are comprehensively analyzed, help engineers and technicians to hold the stress deformation situation of structure in work progress more comprehensively, truly, guarantee that the structural behavior under various operating mode meets designing requirement, really achieve the assessment to structural life circle overall process mechanical property.Present Construction of Steel Structure method, lack more special-shaped super large Steel Cantilever Truss mounting technique, and operating efficiency is low, wastes time and energy.
Chinese patent application 201410124699.2 relates to steel work monolithic architecture construction field, is specially a kind of long-span deformed space lattice tubular truss integral sliding construction method; It is characterized in that: comprise the steps; Step 1, determine erection truss place; Step 2, in foundation ditch, set up trestle type Bailey bracket, lay concrete continuous footing outward at foundation ditch; Step 3, lay four parallel tracks; Step 4, assembled bracing frame and sliding support frame are set; Step 5, utilize crane by erection truss; Step 6, to building, complete truss carries out vertically, the unloading operation of level; Step 7, each sliding support frame to be connected with pusher; Between step 8, each pusher, sync control device is set; Step 9, startup pusher, make sliding support frame synchronization-sliding to target location; Step 10, dismounting sliding support frame carry out truss support installation.
Chinese patent application 201410124699.2 provides a kind of chapped pipe trussed construction group and founds welding tooling, it is characterized in that: this frock comprises carries multiple high operation post and the low level operation post that arranges of high operation column symmetry that value arranges and the support bar assembly be connected between high operation post and low level operation post by curved surface.Beneficial effect of the present invention: 1. by single truss structure figure, presses 1: 1 scale segment setting-out, plate platform is rule, collects this truss structure web member, chord member after levelling; 2. in plate platform, make rigidity moulding bed, frame founds chord member, segmentation spot welding web member two fixing chord members, and the group of carrying out truss is stood.By the bulk such as span, action of moulding bed bonding truss structure; 3. welding, completes truss welding.
Summary of the invention
The object of this invention is to provide the special-shaped super large Steel Cantilever Truss mounting method under the construction of a kind of process monitoring, have the advantages that steel work distortion is little, safe and reliable, construction operation efficiency is high, solve the problem of chapped pipe truss processing and manufacturing inconvenience.
Object of the present invention will be realized by following technical measures: first, based on microcomputer modelling is analyzed, computer simulation analysis is carried out to the controlling work condition state of structure in truss installa-tion and uninstall process, provide install and unloading time displacement structure, component internal force stress, support and constraints desired value, and the condition of each installation steps and unloading step demand fulfillment and points for attention are predictably provided require and instruct accordingly; Secondly, in truss installa-tion and uninstall process with monitoring, monitor as means, carry out the displacement structure of construction stage property, stress, the Real-Time Monitoring value of distortion and analogue value contrast; When relatively large deviation appears in reduced value result, need reason be analyzed, carry out if desired correcting or rectifying a deviation, with guarantee subsequent step smoothly and final molding meet designing requirement; Mounting method process step order is: set up steel structure truss Deepen Design and Structural Analysis Model, steel truss structure manufacture and assembled in advance, make and the monitoring of pre-splicing process of assembling, the on-the-spot segmentation of steel truss is installed, steel truss installation process is monitored, steel truss unloading construction, and steel truss uninstall process is monitored, steel truss installs the shaping monitoring of later stage stage loading, and steel truss structure is checked and accepted.
Especially, idiographic flow comprises:
1. steel truss structure Deepen Design and Structural Analysis Model is set up;
Set up steel truss structure Deepen Design model; By analyzing Deepen Design model, instruct the CNC cutting of factory, component installaiton, welding fabrication, the in advance operation such as assembled; Determine that steel truss makes and mount scheme; Set up steel truss structure simulation analysis model, simulate various operating mode, analyze stress and the deformation state of truss in overall process under different operating mode, to stressed unfavorable and distortion larger position carry out whole day key monitoring;
2. steel truss structure manufacture and assembled in advance;
Carry out steel truss structure manufacture according to CNC cutting situation, whole steel truss segmentation should be carried out assembled in advance by steel truss component in factory;
3. to steel truss structure manufacture and the monitoring of pre-splicing process of assembling;
In manufacturing process, tackle shaping member welding joints carry out complete super spy inspection; Total powerstation is adopted to monitor to steel truss structure manufacture and pre-splicing process of assembling.Monitoring value and design and analysis value are contrasted, revise at any time to pre-assembled result, counter stress and the larger node of distortion carry out stress monitoring and clap the inspection of X sheet;
4. the on-the-spot segmentation of steel truss is installed; Be optimized than choosing by analogue simulation to installation steps and order, scheme adjusted according to analysis result, finally determine installation steps and order, guarantee that assembled at the scene each step of truss is structure invariable system; In-site installation steel truss component, carry out preliminary examination and reinspection to preframed component, preframed component is on the basis of steel work processing factory quality testing department preliminary examination, and Yao Jin factory of in-site installation project management department rechecks workmanship, can dispatch from the factory after qualified, not allow defective component to enter erecting bed; Repetition measurement is carried out to the tie point of truss support; Set up truss local load bearing support system, the position of support system, size and number should be calculated by Work condition analogue to be determined, and carries out designing and setting up according to stressing conditions; Truss hoisting component, the erection sequence of every truss structure should be installed in strict accordance with the process of computer simulation analysis, for numer centre: first install lower edge, after being welded into entirety, then web member is installed, only carries out the first of junction bolt and twist, next install again and wind up, after having corrected web member and having winded up, finally weld, namely installed from the bottom up; The erection sequence of whole Steel Cantilever Truss is then extend from the fixed end be connected with internal construction to part of encorbelmenting to install; In order to ensure construction safety in hoisting process, when Steel Cantilever Truss component can be connected with internal construction in the process extended, should connect immediately, especially rigid connection node, after correction is good, preferential firm welding, makes it form rock-steady structure; Acting in internal construction from weight average of truss, instead of in load bearing support system; So utilize original structure to carry as far as possible, reduce the load of temporary support; Carry out initial survey after rigging out, and carry out the adjustment of verticality, axis, absolute altitude; Truss carries out the installation of next Pin component, until all lifting components are complete;
5. steel truss installation process monitoring; In steel truss field-mounted process, along with the enforcement of installing stage by stage, should arrange static stress and distortion monitoring point on component, these monitoring points arrange respectively by strain transducer and displacement transducer the monitoring realizing static stress and distortion;
Monitoring point requirement is set: the setting of stress monitoring point should arrange monitoring point according to the stress characteristic of structure, measuring point mainly concentrates on the larger cross section of the internal force such as the chord member of steel truss, to lay in strict accordance with the actual conditions that can embody structure stress and direction, thus the duty of component can be reflected really and accurately; The setting of distortion monitoring points will have rational density, should be able to the geometric shape of reflect structure and geometry deformation situation, and is easy to lay, and testing is convenient, high to meet construction monitoring precision, fireballing requirement.
The laying operation requirements of sensor: when sensor is installed, first at steel structure surface unwrapping wire, determine sensor mounting location, then polish at the steel structure surface of installation site, polishing scope is about 50mm × 150mm size; The pedestal carried by strain meter is pulled down, and loads installation form; By the mode of spot welding pedestal, installation form is welded on steel structure surface, forms bolt, spot welding position and installation form; Installation form is taken off, strain meter is loaded in cooled pedestal, the nut of M6 on two sidebands, first tighten the side pedestal not having adjusting nut, strain meter is driven for preventing being tightened nut when tightening again, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat in hand steered left side; Monitor strain meter reading, adjustment adjusting nut; By strain value adjustment at 1500 μ about ε, if structure stress deformation is larger, compressive strain value should be adjusted to 2800 μ about ε, tighten opposite side pedestal again, be that the nut preventing from being tightened drives strain meter when tightening, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat of hand steered opposite side; Finally the adjusting nut on strain meter is unscrewed completely, touch two ends with adz-eye hammer, prevent nut falseness locked; Monitor strain value should be able to be stablized otherwise will reinstall; After installing sensor, by the data line colligation of sensor on steel beam column surface, cause the convenient place arriving and measure; Portable data acquisition box image data is used when arriving the operating mode of specifying; The structure progressively shaping to steel truss segmentation installation process carries out the process monitoring of static stress and distortion, and analyzes, feedback adjustment on-site installation work.
6. steel truss unloading construction; By computer simulation computational analysis, be optimized than choosing to unloading step and order, determine optimum offload scheme.Structure is carried out to the monitoring of the comprehensive static stress and distortion of primary system before unloading.For the situation of change of load-carrying members can be understood further, within one day, unload in advance before unloading, jack stroke is 5mm, once comprehensively checks after pre-completion of discharge to the situation of change of the falling head of the situation of change of debarkation station bearing frame, jack, the quality condition of construction joint and truss amount of deflection; After every passed examination is errorless, just can formally unload.Formal unloading, adopt the unloading that synchronously equidistantly circulates, operating procedure is: complete the ground pressure testing of all unloading jack and the layout of high-altitude unloading point; Holding out against of unloading jack pair main structure lower chord correspondence position, completes the measurement checking and accepting of structural entity profile simultaneously; The former installation strong point is removed the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top, stroke is 5mm; Synchronously a jack arranged is fallen, truss lower edge is contacted with the strong point again; The horizontal level of adjustment jack, makes it keep plumbness and the corresponding strong point, elimination of level Influence of Displacement; Again hold out against jack; The former installation strong point is removed again the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top; Repeat above operation, after each discharging quantity completes, the data of each monitoring point are read, and compare with theory calculate data, instruct discharged later process.Until overall main structure unloading is put in place.
7. steel truss uninstall process monitoring;
Unloaded in latter 24 hours and carried out 4 monitorings stage by stage to steel truss, 4 monitoring times are for have unloaded latter 1 hour, 6 hours, 12 hours and 24 hours.In order to reduce the impact of variations in temperature on steel truss, unloading is general in the morning or complete evening, and the monitoring in its 24 hours also should in the morning or complete evening.
8. the shaping monitoring of steel truss later stage stage loading;
After steel truss is shaping, often carrying out, before and after a floor slab structure construction and secondary maintenance structure construction, monitoring the monitoring point be arranged on steel truss; Carrying out, before and after the steel truss outer decoration construction stage, monitoring the monitoring point be arranged on steel truss; After whole load has applied, the monitoring point be arranged on steel truss is monitored.
9. steel truss structure is checked and accepted;
According to process monitoring data, on-the-spot sense organ, data checked and accepted by establishment steel work, agrees to by checking and accepting through each related responsibility unit.
Advantage of the present invention and effect: the mounting process adopting temporary supporting system and installation in air to combine, realizes the accurate installation to long-span deformed space lattice tubular truss, and make truss uniform force in installation process, not easily produce distortion.Heat from concentrating, welding stress and welding deformation to adopt installation in air method to prevent.
Accompanying drawing explanation
Fig. 1 is the mounting method schematic flow sheet in the present invention.
Detailed description of the invention
The principle of the invention is, the mounting process adopting temporary supporting system and installation in air to combine, removes temporary support after structure has been assembled.Before temporary support is set up, simulation is installed and uninstall process in good time stage by stage, instructs steel truss to install and unloading operation, and guarantee the installation accuracy in installation process and uninstall process and Stability Analysis of Structures with the contrast of calculating parameter and monitored data.
First, based on microcomputer modelling is analyzed, computer simulation analysis is carried out to the controlling work condition state of structure in truss installa-tion and uninstall process, provide install and unloading time displacement structure, component internal force stress, support and constraints desired value etc., and the condition of each installation steps and unloading step demand fulfillment and points for attention are predictably provided require and instruct accordingly.
Secondly, in truss installa-tion and uninstall process with monitoring, monitor as means, carry out the displacement structure of construction stage property, stress, the Real-Time Monitoring value of distortion and analogue value contrast.When relatively large deviation appears in reduced value result, need reason be analyzed, carry out if desired correcting or rectifying a deviation, with guarantee subsequent step smoothly and final molding meet designing requirement.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1: as shown in Figure 1, mounting method process step order is: set up steel structure truss Deepen Design and Structural Analysis Model, steel truss structure manufacture and assembled in advance, make and the monitoring of pre-splicing process of assembling, the on-the-spot segmentation of steel truss is installed, and steel truss installation process is monitored, steel truss unloading construction, steel truss uninstall process is monitored, and steel truss installs the shaping monitoring of later stage stage loading, and steel truss structure is checked and accepted.
Idiographic flow comprises:
1. steel truss structure Deepen Design and Structural Analysis Model is set up;
Set up steel truss structure Deepen Design model.By analyzing Deepen Design model, instruct the CNC cutting of factory, component installaiton, welding fabrication, the in advance operation such as assembled; Determine that steel truss makes and mount scheme; Set up steel truss structure simulation analysis model, simulate various operating mode, analyze stress and the deformation state of truss in overall process under different operating mode, to stressed unfavorable and distortion larger position carry out whole day key monitoring.
2. steel truss structure manufacture and assembled in advance;
Carry out steel truss structure manufacture according to CNC cutting situation, whole steel truss segmentation should be carried out assembled in advance by steel truss component in factory.
3. to steel truss structure manufacture and the monitoring of pre-splicing process of assembling;
In manufacturing process, tackle shaping member welding joints carry out complete super spy inspection; Total powerstation is adopted to monitor to steel truss structure manufacture and pre-splicing process of assembling.Monitoring value and design and analysis value are contrasted, revise at any time to pre-assembled result, counter stress and the larger node of distortion carry out stress monitoring and clap the inspection of X sheet.
4. the on-the-spot segmentation of steel truss is installed; Be optimized than choosing by analogue simulation to installation steps and order, scheme adjusted according to analysis result, finally determine installation steps and order, guarantee that assembled at the scene each step of truss is structure invariable system; In-site installation steel truss component, carry out preliminary examination and reinspection to preframed component, preframed component is on the basis of steel work processing factory quality testing department preliminary examination, and Yao Jin factory of in-site installation project management department rechecks workmanship, can dispatch from the factory after qualified, not allow defective component to enter erecting bed; Repetition measurement is carried out to the tie point of truss support; Set up truss local load bearing support system, the position of support system, size and number should be calculated by Work condition analogue to be determined, and carries out designing and setting up according to stressing conditions; Truss hoisting component, the erection sequence of every truss structure should be installed in strict accordance with the process of computer simulation analysis, for numer centre: first install lower edge, after being welded into entirety, then web member is installed, only carries out the first of junction bolt and twist, next install again and wind up, after having corrected web member and having winded up, finally weld, namely installed from the bottom up.The erection sequence of whole Steel Cantilever Truss is then extend from the fixed end be connected with internal construction to part of encorbelmenting to install.In order to ensure construction safety in hoisting process, when Steel Cantilever Truss component can be connected with internal construction in the process extended, should connect immediately, especially rigid connection node, after correction is good, preferential firm welding, makes it form rock-steady structure.Acting in internal construction from weight average of truss, instead of in load bearing support system.So utilize original structure to carry as far as possible, reduce the load of temporary support; Carry out initial survey after rigging out, and carry out the adjustment of verticality, axis, absolute altitude; Truss carries out the installation of next Pin component, until all lifting components are complete.
5. steel truss installation process monitoring; In steel truss field-mounted process, along with the enforcement of installing stage by stage, should arrange static stress and distortion monitoring point on component, these monitoring points arrange respectively by strain transducer and displacement transducer the monitoring realizing static stress and distortion.
Monitoring point requirement is set: the setting of stress monitoring point should arrange monitoring point according to the stress characteristic of structure, measuring point mainly concentrates on the larger cross section of the internal force such as the chord member of steel truss, to lay in strict accordance with the actual conditions that can embody structure stress and direction, thus the duty of component can be reflected really and accurately.The setting of distortion monitoring points will have rational density, should be able to the geometric shape of reflect structure and geometry deformation situation, and is easy to lay, and testing is convenient, high to meet construction monitoring precision, fireballing requirement.
The laying operation requirements of sensor: when sensor is installed, first at steel structure surface unwrapping wire, determine sensor mounting location, then polish at the steel structure surface of installation site, polishing scope is about 50mm × 150mm size; The pedestal carried by strain meter is pulled down, and loads installation form.By the mode of spot welding pedestal, installation form is welded on steel structure surface, forms bolt, spot welding position and installation form; Installation form is taken off, strain meter is loaded in cooled pedestal, the nut of M6 on two sidebands, first tighten the side pedestal not having adjusting nut, strain meter is driven for preventing being tightened nut when tightening again, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat in hand steered left side; Monitor strain meter reading, adjustment adjusting nut; By strain value adjustment at 1500 μ about ε, if structure stress deformation is larger, compressive strain value should be adjusted to 2800 μ about ε, tighten opposite side pedestal again, be that the nut preventing from being tightened drives strain meter when tightening, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat of hand steered opposite side; Finally the adjusting nut on strain meter is unscrewed completely, touch two ends with adz-eye hammer, prevent nut falseness locked.Monitor strain value should be able to be stablized otherwise will reinstall; After installing sensor, by the data line colligation of sensor on steel beam column surface, cause the convenient place arriving and measure; Portable data acquisition box image data is used when arriving the operating mode of specifying.The structure progressively shaping to steel truss segmentation installation process carries out the process monitoring of static stress and distortion, and analyzes, feedback adjustment on-site installation work.
6. steel truss unloading construction; By computer simulation computational analysis, be optimized than choosing to unloading step and order, determine optimum offload scheme.Structure is carried out to the monitoring of the comprehensive static stress and distortion of primary system before unloading.For the situation of change of load-carrying members can be understood further, within one day, unload in advance before unloading, jack stroke is 5mm, once comprehensively checks after pre-completion of discharge to the situation of change of the falling head of the situation of change of debarkation station bearing frame, jack, the quality condition of construction joint and truss amount of deflection.After every passed examination is errorless, just can formally unload.Formal unloading, adopt the unloading that synchronously equidistantly circulates, operating procedure is: complete the ground pressure testing of all unloading jack and the layout of high-altitude unloading point; Holding out against of unloading jack pair main structure lower chord correspondence position, completes the measurement checking and accepting of structural entity profile simultaneously; The former installation strong point is removed the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top, stroke is 5mm; Synchronously a jack arranged is fallen, truss lower edge is contacted with the strong point again; The horizontal level of adjustment jack, makes it keep plumbness and the corresponding strong point, elimination of level Influence of Displacement; Again hold out against jack; The former installation strong point is removed again the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top.Repeat above operation, after each discharging quantity completes, the data of each monitoring point are read, and compare with theory calculate data, instruct discharged later process.Until overall main structure unloading is put in place.
7. steel truss uninstall process monitoring;
Unloaded in latter 24 hours and carried out 4 monitorings stage by stage to steel truss, 4 monitoring times are for have unloaded latter 1 hour, 6 hours, 12 hours and 24 hours.In order to reduce the impact of variations in temperature on steel truss, unloading is general in the morning or complete evening, and the monitoring in its 24 hours also should in the morning or complete evening.
8. the shaping monitoring of steel truss later stage stage loading;
After steel truss is shaping, often carrying out, before and after a floor slab structure construction and secondary maintenance structure construction, monitoring the monitoring point be arranged on steel truss.Carrying out, before and after the steel truss outer decoration construction stage, monitoring the monitoring point be arranged on steel truss.After whole load has applied, the monitoring point be arranged on steel truss is monitored.
9. steel truss structure is checked and accepted;
According to process monitoring data, on-the-spot sense organ, data checked and accepted by establishment steel work, agrees to by checking and accepting through each related responsibility unit.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize manual of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (2)
1. the special-shaped super large Steel Cantilever Truss mounting method under process monitoring construction, it is characterized in that, first, based on microcomputer modelling is analyzed, computer simulation analysis is carried out to the controlling work condition state of structure in truss installa-tion and uninstall process, provide install and unloading time displacement structure, component internal force stress, support and constraints desired value, and the condition of each installation steps and unloading step demand fulfillment and points for attention are predictably provided require and instruct accordingly; Secondly, in truss installa-tion and uninstall process with monitoring, monitor as means, carry out the displacement structure of construction stage property, stress, the Real-Time Monitoring value of distortion and analogue value contrast; When relatively large deviation appears in reduced value result, need reason be analyzed, carry out if desired correcting or rectifying a deviation, with guarantee subsequent step smoothly and final molding meet designing requirement; Mounting method process step order is: set up steel structure truss Deepen Design and Structural Analysis Model, steel truss structure manufacture and assembled in advance, make and the monitoring of pre-splicing process of assembling, the on-the-spot segmentation of steel truss is installed, steel truss installation process is monitored, steel truss unloading construction, and steel truss uninstall process is monitored, steel truss installs the shaping monitoring of later stage stage loading, and steel truss structure is checked and accepted.
2. the special-shaped super large Steel Cantilever Truss mounting method under process monitoring construction as claimed in claim 1, it is characterized in that, idiographic flow comprises:
1. steel truss structure Deepen Design and Structural Analysis Model is set up;
Set up steel truss structure Deepen Design model; By analyzing Deepen Design model, instruct the CNC cutting of factory, component installaiton, welding fabrication, the in advance operation such as assembled; Determine that steel truss makes and mount scheme; Set up steel truss structure simulation analysis model, simulate various operating mode, analyze stress and the deformation state of truss in overall process under different operating mode, to stressed unfavorable and distortion larger position carry out whole day key monitoring;
2. steel truss structure manufacture and assembled in advance;
Carry out steel truss structure manufacture according to CNC cutting situation, whole steel truss segmentation should be carried out assembled in advance by steel truss component in factory;
3. to steel truss structure manufacture and the monitoring of pre-splicing process of assembling;
In manufacturing process, tackle shaping member welding joints carry out complete super spy inspection; Total powerstation is adopted to monitor to steel truss structure manufacture and pre-splicing process of assembling.Monitoring value and design and analysis value are contrasted, revise at any time to pre-assembled result, counter stress and the larger node of distortion carry out stress monitoring and clap the inspection of X sheet;
4. the on-the-spot segmentation of steel truss is installed; Be optimized than choosing by analogue simulation to installation steps and order, scheme adjusted according to analysis result, finally determine installation steps and order, guarantee that assembled at the scene each step of truss is structure invariable system; In-site installation steel truss component, carry out preliminary examination and reinspection to preframed component, preframed component is on the basis of steel work processing factory quality testing department preliminary examination, and Yao Jin factory of in-site installation project management department rechecks workmanship, can dispatch from the factory after qualified, not allow defective component to enter erecting bed; Repetition measurement is carried out to the tie point of truss support; Set up truss local load bearing support system, the position of support system, size and number should be calculated by Work condition analogue to be determined, and carries out designing and setting up according to stressing conditions; Truss hoisting component, the erection sequence of every truss structure should be installed in strict accordance with the process of computer simulation analysis, for numer centre: first install lower edge, after being welded into entirety, then web member is installed, only carries out the first of junction bolt and twist, next install again and wind up, after having corrected web member and having winded up, finally weld, namely installed from the bottom up; The erection sequence of whole Steel Cantilever Truss is then extend from the fixed end be connected with internal construction to part of encorbelmenting to install; In order to ensure construction safety in hoisting process, when Steel Cantilever Truss component can be connected with internal construction in the process extended, should connect immediately, especially rigid connection node, after correction is good, preferential firm welding, makes it form rock-steady structure; Acting in internal construction from weight average of truss, instead of in load bearing support system; So utilize original structure to carry as far as possible, reduce the load of temporary support; Carry out initial survey after rigging out, and carry out the adjustment of verticality, axis, absolute altitude; Truss carries out the installation of next Pin component, until all lifting components are complete;
5. steel truss installation process monitoring; In steel truss field-mounted process, along with the enforcement of installing stage by stage, should arrange static stress and distortion monitoring point on component, these monitoring points arrange respectively by strain transducer and displacement transducer the monitoring realizing static stress and distortion;
Monitoring point requirement is set: the setting of stress monitoring point should arrange monitoring point according to the stress characteristic of structure, measuring point mainly concentrates on the larger cross section of the internal force such as the chord member of steel truss, to lay in strict accordance with the actual conditions that can embody structure stress and direction, thus the duty of component can be reflected really and accurately; The setting of distortion monitoring points will have rational density, should be able to the geometric shape of reflect structure and geometry deformation situation, and is easy to lay, and testing is convenient, high to meet construction monitoring precision, fireballing requirement;
The laying operation requirements of sensor: when sensor is installed, first at steel structure surface unwrapping wire, determine sensor mounting location, then polish at the steel structure surface of installation site, polishing scope is about 50mm × 150mm size; The pedestal carried by strain meter is pulled down, and loads installation form; By the mode of spot welding pedestal, installation form is welded on steel structure surface, forms bolt, spot welding position and installation form; Installation form is taken off, strain meter is loaded in cooled pedestal, the nut of M6 on two sidebands, first tighten the side pedestal not having adjusting nut, strain meter is driven for preventing being tightened nut when tightening again, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat in hand steered left side; Monitor strain meter reading, adjustment adjusting nut; By strain value adjustment at 1500 μ about ε, if structure stress deformation is larger, compressive strain value should be adjusted to 2800 μ about ε, tighten opposite side pedestal again, be that the nut preventing from being tightened drives strain meter when tightening, cause strain meter distortion, while fastening nut, counter-force should be applied with the end seat of hand steered opposite side; Finally the adjusting nut on strain meter is unscrewed completely, touch two ends with adz-eye hammer, prevent nut falseness locked; Monitor strain value should be able to be stablized otherwise will reinstall; After installing sensor, by the data line colligation of sensor on steel beam column surface, cause the convenient place arriving and measure; Portable data acquisition box image data is used when arriving the operating mode of specifying; The structure progressively shaping to steel truss segmentation installation process carries out the process monitoring of static stress and distortion, and analyzes, feedback adjustment on-site installation work;
6. steel truss unloading construction; By computer simulation computational analysis, be optimized than choosing to unloading step and order, determine optimum offload scheme.Structure is carried out to the monitoring of the comprehensive static stress and distortion of primary system before unloading.For the situation of change of load-carrying members can be understood further, within one day, unload in advance before unloading, jack stroke is 5mm, once comprehensively checks after pre-completion of discharge to the situation of change of the falling head of the situation of change of debarkation station bearing frame, jack, the quality condition of construction joint and truss amount of deflection; After every passed examination is errorless, just can formally unload.Formal unloading, adopt the unloading that synchronously equidistantly circulates, operating procedure is: complete the ground pressure testing of all unloading jack and the layout of high-altitude unloading point; Holding out against of unloading jack pair main structure lower chord correspondence position, completes the measurement checking and accepting of structural entity profile simultaneously; The former installation strong point is removed the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top, stroke is 5mm; Synchronously a jack arranged is fallen, truss lower edge is contacted with the strong point again; The horizontal level of adjustment jack, makes it keep plumbness and the corresponding strong point, elimination of level Influence of Displacement; Again hold out against jack; The former installation strong point is removed again the cushion block of each discharging quantity corresponding height or corresponding height is cut off at strong point top; Repeat above operation, after each discharging quantity completes, the data of each monitoring point are read, and compare with theory calculate data, instruct discharged later process.Until overall main structure unloading is put in place;
7. steel truss uninstall process monitoring;
Unloaded in latter 24 hours and carried out 4 monitorings stage by stage to steel truss, 4 monitoring times are for have unloaded latter 1 hour, 6 hours, 12 hours and 24 hours.In order to reduce the impact of variations in temperature on steel truss, unloading is general in the morning or complete evening, and the monitoring in its 24 hours also should in the morning or complete evening;
8. the shaping monitoring of steel truss later stage stage loading;
After steel truss is shaping, often carrying out, before and after a floor slab structure construction and secondary maintenance structure construction, monitoring the monitoring point be arranged on steel truss; Carrying out, before and after the steel truss outer decoration construction stage, monitoring the monitoring point be arranged on steel truss; After whole load has applied, the monitoring point be arranged on steel truss is monitored;
9. steel truss structure is checked and accepted; According to process monitoring data, on-the-spot sense organ, data checked and accepted by establishment steel work, agrees to by checking and accepting through each related responsibility unit.
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