CN113666284A - Hydraulic lifting construction method for outdoor truss steel structure - Google Patents
Hydraulic lifting construction method for outdoor truss steel structure Download PDFInfo
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- CN113666284A CN113666284A CN202110969354.7A CN202110969354A CN113666284A CN 113666284 A CN113666284 A CN 113666284A CN 202110969354 A CN202110969354 A CN 202110969354A CN 113666284 A CN113666284 A CN 113666284A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C25/00—Cranes not provided for in groups B66C17/00 - B66C23/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
Abstract
The invention relates to the technical field of building construction, and provides a hydraulic lifting construction method for an outdoor truss steel structure, which comprises an assembling jig frame, wherein a single truss is arranged at the top of the assembling jig frame, a jack is arranged at the left side of the single truss, steel columns are arranged at the left side and the right side close to the assembling jig frame, a lifting platform is arranged at the top of each steel column, a hydraulic synchronous lifting device is arranged at the top of each lifting platform, a steel strand is arranged on each hydraulic synchronous lifting device, and a temporary lifting appliance is fixedly connected at the bottom of each steel strand. The flexible rigging is adopted for bearing, so long as a reasonable bearing lifting point is provided, the lifting height is not limited, and the lifting equipment is small in size.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a hydraulic lifting construction method for an outdoor truss steel structure.
Background
With the development of the steel structure industry, various large-span and large-space building designs are fearful, such as: airports, railway stations, exhibition centers, stadiums, exhibition halls and the like bring new opportunities and challenges to the installation of steel structure engineering. However, in the construction of the outdoor truss steel structure, the problem that large equipment cannot be used for hoisting or uneconomical engineering can not be used for hoisting by adopting the large equipment, and the complex space truss structure has large high-altitude bulk welding amount and is subjected to field hoisting welding, so that the truss hoisting precision, the hoisting posture and the precision of a butt joint preset part are extremely high, the truss is very heavy, and the adjustment in a hoisting state is very difficult, so that the traditional installation technology cannot meet the development requirement of the current steel structure industry.
Disclosure of Invention
In order to make up for the above deficiencies, the invention provides a hydraulic lifting construction method for an outdoor truss steel structure, which comprises an assembling jig frame, wherein a single truss is placed at the top of the assembling jig frame, a jack is arranged at the left side of the single truss, steel columns are arranged at the left side and the right side close to the assembling jig frame, pre-installed section brackets are arranged at the opposite sides of the two steel columns, the pre-installed section brackets are fixed with the single truss through welding, a lifting platform is arranged at the top of the steel columns, a hydraulic synchronous lifting device is arranged at the top of the lifting platform, a steel strand is arranged on the hydraulic synchronous lifting device, a temporary lifting appliance is fixedly connected at the bottom of the steel strand, the temporary lifting appliance is fixedly connected with the top of the single truss, each hydraulic synchronous lifting device is connected with a hydraulic pump source system through an oil pipe, and the hydraulic pump source system is in communication connection with a synchronous control detection system through a wire, the hydraulic pump source system is used for providing power for the hydraulic synchronous lifting devices, controlling a plurality of or a single hydraulic synchronous lifting device to control and adjust, executing the instruction of the synchronous control detection system and feeding back data.
The hydraulic lifting construction method of the outdoor truss steel structure comprises the following steps:
s1, assembling single trusses, positioning and assembling end trusses on the ground with the elevation of +/-0.000 m under the installation position of the single trusses in a horizontal assembling mode → assembling and welding upper chords, assembling and welding lower chords → assembling and welding middle parts to form a whole;
s2, installing a hydraulic synchronous lifting device, arranging a lifting platform by using a steel frame beam and a steel column, installing the hydraulic synchronous lifting device at the top of the lifting platform, setting the hydraulic synchronous lifting device as an upper lifting point, installing a lower lifting point at a position of a single-truss corresponding to the upper lifting point, wherein the lower lifting point is a temporary lifting appliance fixedly connected to the bottom end of the steel strand, fixedly connecting the two temporary lifting appliances with two ends of the top of the single-truss, and simultaneously arranging a group of inverted chains at two ends of a lower chord of the single-truss to be firmly connected with a frame post of a main building for assisting the single-truss to turn over and debugging the hydraulic synchronous lifting device, and simultaneously checking whether all temporary measures of the single-truss meet design requirements or not, and starting to test the lifting after a mistake is confirmed;
step S3, the single truss is lifted in a trial mode and loaded step by step according to the sequence of the design load until the lifting unit is separated from the assembly platform, when the lowest point of the lifting unit is separated from the jig frame by about 100mm, the lifting is suspended, the elevation of each lifting point of the lifting unit is finely adjusted to be in the design posture, the maximum deformation of the span of the lifting unit is measured and recorded, the lifting unit is kept still for 2-24 hours, whether the single truss of the roof steel beam and the hydraulic synchronous lifting device are abnormal or not is checked again, the measured data are compared with the time when the roof is lifted off, and after the abnormal condition is confirmed, the formal lifting is started;
s4, when the truss is lifted to about 600mm from the designed elevation, suspending lifting, measuring the actual elevation of each lifting point, comparing with the designed elevation, making a record, using the record as the basis for continuous lifting, reducing the lifting speed of the hydraulic synchronous device, using the synchronous control detection system to detect and send an instruction to make the hydraulic pump source system control the hydraulic synchronous lifting device to finely adjust or jog, and making each lifting point slowly reach the designed elevation in turn to meet the installation requirement;
and step S5, after the trusses are fixedly installed and the single trusses are lifted in place, installing post-installed rod pieces to form a complete stress system, unloading the hydraulic synchronous lifting devices in a grading mode according to the sequence until the steel strands are loosened, transferring all loads of the single trusses to steel columns, dismantling the hydraulic lifting devices, temporary measures and the like, and completing the lifting operation of the single trusses.
Furthermore, the hydraulic synchronous lifting device comprises a hydraulic lifter and a sensor, the hydraulic pump source system comprises an on-site controller, the synchronous control detection system comprises a computer, the output end of the sensor is in communication connection with the input end of the computer, the output end of the computer is in communication connection with the input end of the on-site controller, and the output end of the on-site controller is in communication connection with the input end of the hydraulic lifter.
Furthermore, the hydraulic synchronous lifting device, the hydraulic pump source system and the synchronous control detection system all obtain a working power supply through commercial power.
Further, promote the platform top and evenly be provided with the fixed plate, the fixed plate is L shape, the bottom of fixed plate with promote the top welding of platform, four the fixed plate with the bottom joint of hydraulic pressure lifting mechanism.
Furthermore, one side of the hydraulic lifter is provided with a guide frame, and the guide frame is used for freely dredging the redundant steel strands backwards and downwards along the lifting platform.
Further, the step-by-step loading sequence in step S3 is as follows: 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100%.
Further, in step S4, in the lifting process, because height fine adjustment is required for air attitude adjustment, post-loading rod installation, and the like, before fine adjustment starts, the synchronous control detection system is switched from the automatic mode to the manual mode, and according to the requirement, the hydraulic lifters of each lifting point in the whole hydraulic synchronous lifting device are synchronously and slightly moved, i.e., lifted or lowered, or a single hydraulic lifter is slightly moved, i.e., adjusted, with the precision in millimeters.
Further, the hierarchical unloading in step S5 is: 95%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%.
The invention has the beneficial effects that:
1. the construction method of the invention has the advantages that the lifting weight, span and area are not limited by the expansion combination of the lifting equipment, the lifting process is very safe, the member can be locked at any position in the lifting process, any hydraulic lifter can be independently adjusted, the adjustment precision is high, the controllability of the installation precision in the structure lifting process is effectively improved, the flexible rigging is adopted for bearing, the lifting height is not limited as long as a reasonable bearing lifting point is provided, the lifting equipment has small volume, light dead weight and large bearing capacity, and the construction method is particularly suitable for the lifting operation of large-scale equipment.
2. The construction method has the advantages that the automation degree of the adopted equipment is high, the hydraulic synchronous lifting is realized by controlling the synchronization of the lifting points through the computer, the components keep stable lifting postures in the lifting process, the synchronous control precision is high, the operation of a large crane is omitted, mechanical equipment and manpower resources can be greatly saved, the field construction operation surface can be fully utilized, and the control on the overall construction period of the project is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of the construction method of the present invention;
FIG. 2 is a schematic diagram of the apparatus of the present invention;
FIG. 3 is a schematic diagram illustrating a single truss lifting process according to the present invention;
FIG. 4 is a schematic view of a hydraulic lifter mounting structure of the present invention;
FIG. 5 is a schematic plan view of the fixing plate of the present invention;
FIG. 6 is a perspective view of the guide frame of the present invention;
fig. 7 is a schematic diagram of a control structure of the present invention.
In the figure: 1. a single truss; 2. a temporary spreader; 3. a steel column; 4. steel strand wires; 5. pre-assembling a section of bracket; 6. lifting the platform; 7. a hydraulic synchronous lifting device 701 and a hydraulic lifter; 702. a sensor; 8. assembling a jig frame; 9. a jack; 10. chain rewinding; 11. a hydraulic pump source system; 1101. a local controller; 12. a synchronous control detection system; 1201. a computer; 13. a fixing plate; 14. a guide frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Examples
As shown in FIG. 2, a hydraulic lifting device for an outdoor truss steel structure comprises an assembling jig frame 8, wherein a single truss 1 is placed at the top of the assembling jig frame 8, a jack 9 is arranged at the left side of the single truss 1, steel columns 3 are arranged at the left side and the right side close to the assembling jig frame 8, pre-assembling section brackets 5 are arranged at the opposite sides of the two steel columns 3, the pre-assembling section brackets 5 are fixedly connected with the single truss 1 through welding, a lifting platform 6 is arranged at the top of the steel columns 3, a hydraulic synchronous lifting device 7 is arranged at the top of the lifting platform 6, steel strands 4 are installed on the hydraulic synchronous lifting device 7, a temporary lifting appliance 2 is fixedly connected at the bottom of each steel strand 4, the temporary lifting appliance 2 is fixedly connected with the top of the single truss 1, each hydraulic synchronous lifting device 7 is connected with a hydraulic pump source system 11 through an oil pipe, the hydraulic pump source system 11 is in communication connection with a synchronous control detection system 12 through a lead, the hydraulic pump source system 11 is used for providing power for the hydraulic synchronous lifting devices 7, controlling a plurality of or a single hydraulic synchronous lifting device 7 to control and adjust, executing instructions of the synchronous control detection system 12 and feeding back data.
The hydraulic lifting construction method of the outdoor truss steel structure comprises the following steps:
s1, assembling a single truss 1, and positioning and assembling end trusses on the ground with the elevation of +/-0.000 m under the installation position of the single truss 1 in a horizontal assembling mode → assembling and welding upper chords, assembling and welding lower chords → assembling and welding middle parts to form a whole;
the assembly platform is placed horizontally and vertically by adopting an H500 section steel 2 layer, the length is adjusted according to the length of a single truss 1, the distance is 3m, a 12mm thick steel plate is arranged below the platform, the assembly process of the platform is ensured to be stable, the building peripheral truss is assembled on the peripheral backfill hardening ground, the inner side truss is assembled on the floor slab, and the construction process comprises the following steps: the method comprises the steps of field leveling and hardening → three-section column measurement and paying-off → jig frame positioning → jig frame manufacturing and installation → single-truss 1 assembly, after the construction of a single-truss 1 assembly platform is finished, firstly, measurement of a third-section column pre-assembly section is carried out, measurement and paying-off are carried out on the single-truss 1 assembly platform, the assembly position of an end truss is preset, then, the position of a hanging lug is positioned, and finally, the position of an assembly jig frame 8 is determined, so that the accuracy of the assembly position of the single-truss 1 is ensured.
As shown in fig. 3, step S2 is to install a hydraulic synchronous lifting device 7, set a lifting platform 6 by using a steel frame beam and a steel column 3, install the hydraulic synchronous lifting device 7 at the top of the lifting platform 6, set an upper lifting point, install a lower lifting point at a position corresponding to the upper lifting point of the single-truss 1, the lower lifting point is a temporary lifting appliance 2 fixedly connected to the bottom end of a steel stranded wire 4, and is fixedly connected to two ends of the top of the single-truss 1 through two temporary lifting appliances 2, and at the same time, a set of inverted chains 10 are respectively arranged at two ends of the lower chord of the single-truss 1 to be firmly connected to a main building frame column, so as to assist the single-truss 1 to turn over, debug the hydraulic synchronous lifting device 7, check whether all temporary measures of the single-truss 1 meet design requirements, and start trial lifting after confirming that no error exists;
step S3, the single truss 1 is lifted in a trial mode and loaded step by step according to the sequence of the design load until the lifting unit is separated from the splicing platform, when the lowest point of the lifting unit is separated from the splicing jig frame by about 100mm, the lifting is suspended, the elevation of each lifting point of the single truss 1 is finely adjusted to be in the design posture, the maximum deformation of the span of the single truss 1 is measured and recorded, the standing is carried out for 2-24 hours, the single truss 1 of the roof girder, the hydraulic synchronous lifting device 7 and the temporary measure are checked again, the measured data are compared with the measured data when the roof is lifted off the ground, and the formal lifting is started after the abnormal condition is confirmed;
the main purpose of the trial lifting is to confirm that the calculation and design conditions of the simulation working condition are met through observation and monitoring of the single truss 1, the temporary lifting measures and the lifting equipment system in the trial lifting process, and ensure the safety of the lifting process.
After the equipment of the hydraulic pump source system 11 is detected without errors, the trial lifting is started, and the cylinder extending pressure (considering the pressure loss) and the cylinder retracting pressure required by the hydraulic lifter 701 are determined according to the counterforce values of the lifting points, which are calculated by the simulation of the computer 1201.
When the trial lifting is started, the cylinder extending pressure of the hydraulic lifter 701 is gradually increased to 20%, 40% and 60% of the required pressure, and under all normal conditions, the hydraulic lifter 701 can be continuously loaded to 70%, 80%, 90%, 95% and 100% until the lifting units are completely separated from the assembly jig frame 8.
In the process of hierarchical loading, after each step of hierarchical loading is finished, suspending and checking the steps as follows: deformation conditions before and after loading of the upper hanging point, the lower hanging point structure, the single truss 1 and the like, stability of the main structure and the like, and under all normal conditions, the next step of graded loading is continued.
When the single truss 1 is loaded in a grading way, namely the single truss 1 leaves the splicing jig 8, each point possibly leaves the ground at different times, the lifting speed is reduced, the situation of each point leaving the ground is closely observed, and the single-point lifting is carried out if necessary, so that the single truss 1 can be ensured to leave the ground stably.
Step S4, when the single truss 1 is lifted to about 600mm from the designed elevation, the lifting is suspended, the actual elevation of each lifting point is measured and compared with the designed elevation, the record is made, the actual elevation is used as the basis for continuous lifting, the lifting speed of the hydraulic synchronous lifting device 7 is reduced, the synchronous control detection system 12 is used for detecting and sending out an instruction, the hydraulic pump source system 11 is used for controlling the hydraulic synchronous lifting device 7 to be finely adjusted or moved, and the lifting points slowly and sequentially reach the designed elevation to meet the installation requirement;
a set of stroke sensors 702 is arranged at each hydraulic lifter 701 to measure the lifting displacement synchronism of each hydraulic lifter 701 in the lifting process, and the main control computer 1201 forms a closed-loop system of 'sensor 702-computer 1201-pump source control valve-lifter control valve-hydraulic lifter 701-single truss 1' according to the displacement detection signals of each sensor 702 and the difference value thereof to control the synchronism of the whole lifting process;
the measuring instrument is used for detecting the ground clearance of each lifting point, the relative height difference of each lifting point is calculated, the height of each lifting point is adjusted through the hydraulic synchronous lifting device 7, the single truss 1 reaches the designed posture, the adjusted height of each lifting point is used as a new initial position, the displacement sensor 702 is reset, and the posture is kept until the lifting point is lifted to the vicinity of the designed elevation in the whole lifting process.
Step S5, after the trusses are fixedly installed and the single trusses 1 are lifted in place, post-installed rod pieces are installed to form a complete stress system, the hydraulic synchronous lifting devices 7 unload the single trusses 1 in a grading mode according to the sequence of 95%, 90%, 80%, 70%, 60%, 50%, 40%, 30% and 20% until the steel strands 4 are loosened, the load of the single trusses 1 is completely transferred to the steel columns 3, the hydraulic synchronous lifting devices 7 are removed, temporary measures are taken, and the like, and the lifting operation of the single trusses 1 is completed.
The hydraulic synchronous lifting device 7 comprises a hydraulic lifter 701 and a sensor 702, a hydraulic pump source system 11 comprises a local controller 1101, a synchronous control detection system 12 comprises a computer 1201, the output end of the sensor 702 is in communication connection with the input end of the computer 1201, the output end of the computer 1201 is in communication connection with the input end of the local controller 1101, and the output end of the local controller 1101 is in communication connection with the input end of the hydraulic lifter 701.
In the method, hydraulic lifting bearing equipment mainly adopts a core-through hydraulic lifter 701;
the hydraulic pump source system 11 provides power for the hydraulic lifters 701, controls and adjusts a plurality of or a single hydraulic lifter 701 through the local controller 1101, executes an instruction of the synchronous control detection system 12 and feeds back data;
the synchronous control detection system 12 adopts sensing monitoring and centralized control of the computer 1201, and can fully automatically realize various functions such as synchronous action, load balancing, posture correction, stress control, operation locking, process display, fault alarm and the like through data feedback and control instruction transmission.
The synchronous control detection system 12 equipment used for the method adopts CAN bus control and three-level control from the main controller to the hydraulic lifters 701, and realizes independent real-time monitoring and adjustment of each hydraulic lifter 701 in the system, so that the synchronous control precision of the hydraulic synchronous lifting process is higher, and the real-time performance is better.
An operator can observe the hydraulic lifting process and related data and/or issue control commands through a computer 1201 human-computer interface in a central control room.
Through the operation of a human-computer interface of the computer 1201, automatic control, sequential control (single-stroke action), manual control and inching operation of the single hydraulic lifter 701 can be realized, so that special requirements such as synchronous lifting, air attitude adjustment, single-point millimeter-scale fine adjustment and the like required in the integral lifting and mounting process of the single truss 1 are met.
The hydraulic synchronous lifting device 7, the hydraulic pump source system 11 and the synchronous control detection system 12 all obtain a working power supply through commercial power.
As shown in fig. 5, fixing plates 13 are uniformly arranged on the top of the lifting platform 6, the fixing plates 13 are L-shaped, the bottoms of the fixing plates 13 are welded to the top of the lifting platform 6, the four fixing plates 13 are clamped to the bottoms of the hydraulic lifters 701, the hydraulic lifters 701 are mounted in place and then fixed by the temporary fixing plates 13, each hydraulic lifter 701 needs 4 lifter temporary fixing plates 13, and the contact surface with the hydraulic lifter 701 needs to be flat so that the lifter base can be clamped; the bottom surface and the top of the lower lifting platform 6 are welded and fixed, double-sided fillet welding lines are adopted for welding, the welding lines cannot contact with the base of the hydraulic lifter 701 during welding, and the height of the welding lines is not less than 10 mm.
As shown in fig. 6, a guide frame 14 is arranged on one side of the hydraulic lifter 701, during the lifting or lowering process of the hydraulic lifter 701, the top of the hydraulic lifter 701 must reserve the steel strand 4, and if the reserved steel strand 4 is too much, the operation of the steel strand 4 and the locking and opening of the anchor and the upper anchor of the hydraulic lifter 701 during the lifting or lowering process are greatly affected, so that each hydraulic lifter 701 must be configured with the guide frame 14 in advance, which is convenient for the smooth guiding of the reserved steel strand 4 on the top of the hydraulic lifter, and the redundant steel strand 4 can be freely guided backwards and downwards along the lifting platform 6.
In step S4, during the lifting process, because height fine adjustment is required for air attitude adjustment, post-loading rod installation, and the like, before fine adjustment starts, the synchronous control detection system 12 is switched from the automatic mode to the manual mode, and according to the requirement, the hydraulic lifters 701 at each lifting point in the entire hydraulic synchronous lifting device 7 are synchronously and finely adjusted, i.e., lifted or lowered, or a single hydraulic lifter 701 is finely adjusted, i.e., jog adjustment is performed, and the precision is in millimeters.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The hydraulic lifting construction method for the outdoor truss steel structure is characterized by comprising the following steps of: the steel wire rope splicing device comprises an assembling jig frame (8), wherein a single truss (1) is placed at the top of the assembling jig frame (8), a jack (9) is arranged on the left side of the single truss (1), steel columns (3) are arranged on the left side and the right side close to the assembling jig frame (8), pre-assembling section brackets (5) are arranged on the opposite sides of the two steel columns (3), the pre-assembling section brackets (5) are fixedly welded with the single truss (1), a lifting platform (6) is arranged at the top of each steel column (3), a hydraulic synchronous lifting device (7) is arranged at the top of the lifting platform (6), steel strands (4) are installed on the hydraulic synchronous lifting device (7), a temporary lifting tool (2) is fixedly connected to the bottom of each steel strand (4), the temporary lifting tool (2) is fixedly connected with the top of the single truss (1), and each hydraulic synchronous lifting device (7) is connected with a hydraulic pump source system (11) through an oil pipe, the hydraulic pump source system (11) is in communication connection with the synchronous control detection system (12) through a lead, and the hydraulic pump source system (11) is used for providing power for the hydraulic synchronous lifting devices (7), controlling a plurality of or a single hydraulic synchronous lifting device (7) to control and adjust, executing instructions of the synchronous control detection system (12) and feeding back data;
the hydraulic lifting construction method of the outdoor truss steel structure comprises the following steps:
s1, assembling single trusses (1), and positioning and assembling end trusses on the ground with the elevation +/-0.000 m under the installation position of the single trusses (1), assembling and welding upper chords, assembling and welding lower chords, assembling and welding middle parts and assembling and welding the trusses into a whole in a horizontal assembling mode;
s2 installing a hydraulic synchronous lifting device (7), setting a lifting platform (6) by utilizing a steel frame beam and a steel column (3), installing the hydraulic synchronous lifting device (7) at the top of the lifting platform (6) to be an upper lifting point, installing a lower lifting point at the position corresponding to the upper lifting point of the single truss (1), wherein the lower lifting point is a temporary lifting appliance (2) fixedly connected with the bottom end of the steel strand (4), fixedly connecting the two temporary lifting appliances (2) with the two ends of the top of the single truss (1), simultaneously arranging a group of inverted chains (10) at the two ends of the lower chord of the single truss (1) to be firmly connected with a main building frame column for assisting the single truss (1) to turn over, debugging the hydraulic synchronous lifting device (7), simultaneously checking whether all temporary measures of the single truss (1) meet design requirements or not, and after confirming that no error exists, starting trial lifting;
step S3, the single truss (1) is lifted in a trial mode and loaded step by step according to the sequence of the design load until the lifting unit is separated from the assembly platform, when the lowest point of the lifting unit is separated from the jig frame by about 100mm, the lifting is suspended, the elevation of each lifting point of the lifting unit is finely adjusted to be in the design posture, the maximum deformation of the span of the lifting unit is measured and recorded, the lifting unit is kept still for 2-24 hours, the single truss (1) of the roof steel girder and the hydraulic synchronous lifting device (7) are checked again, whether the temporary measures are abnormal or not is determined, the measured data are compared with the time when the roof is lifted off, and the formal lifting is started after the abnormal condition is determined;
s4, when the truss is lifted formally and the single truss (1) is lifted to about 600mm away from the designed elevation, the lifting is suspended, the actual elevation of each lifting point is measured and compared with the designed elevation, the record is made, the actual elevation is used as the basis for continuous lifting, the lifting speed of the hydraulic synchronous device is reduced, the synchronous control detection system (12) is used for detecting and sending out an instruction to enable the hydraulic pump source system (11) to control the hydraulic synchronous lifting device (7) to be finely adjusted or moved, so that each lifting point slowly and sequentially reaches the designed elevation, and the installation requirement is met;
and S5, mounting and fixing the trusses, mounting a rear-mounted rod piece after the single trusses (1) are lifted in place, forming a complete stress system, sequentially unloading the hydraulic synchronous lifting devices (7) in a grading manner until the steel strands (4) are loosened, transferring all the load of the single trusses (1) to the steel columns (3), dismantling the hydraulic lifting devices, taking temporary measures and the like, and completing the lifting operation of the single trusses (1).
2. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 1, wherein the method comprises the following steps: the hydraulic synchronous lifting device (7) comprises a hydraulic lifter (701) and a sensor (702), the hydraulic pump source system (11) comprises a local controller (1101), the synchronous control detection system (12) comprises a computer (1201), the output end of the sensor (702) is in communication connection with the input end of the computer (1201), the output end of the computer (1201) is in communication connection with the input end of the local controller (1101), and the output end of the local controller (1101) is in communication connection with the input end of the hydraulic lifter (701).
3. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 2, wherein the method comprises the following steps: the hydraulic synchronous lifting device (7), the hydraulic pump source system (11) and the synchronous control detection system (12) all obtain a working power supply through commercial power.
4. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 2, wherein the method comprises the following steps: promote platform (6) top and evenly be provided with fixed plate (13), fixed plate (13) are L shape, the bottom of fixed plate (13) with the top welding of promotion platform (6), four fixed plate (13) with the bottom joint of hydraulic pressure lifting mechanism (701).
5. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 2, wherein the method comprises the following steps: one side of the hydraulic lifter (701) is provided with a guide frame (14), and the guide frame (14) is used for freely dredging the redundant steel strands (4) backwards and downwards along the lifting platform (6).
6. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 1, wherein the method comprises the following steps: the step-by-step loading sequence in step S3 is: 20%, 40%, 60%, 70%, 80%, 90%, 95%, 100%.
7. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 1, wherein the method comprises the following steps: in the step S4, in the lifting process, because height fine adjustment is required for air attitude adjustment, rear-mounted rod installation and the like, before fine adjustment is started, the synchronous control detection system (12) is switched from an automatic mode to a manual mode, and synchronous fine adjustment, that is, lifting or lowering, is performed on the hydraulic lifters (701) of each lifting point in the whole hydraulic synchronous lifting device (7) according to the requirement, or fine adjustment, that is, inching adjustment is performed on a single hydraulic lifter (701), and the precision is in millimeter units.
8. The hydraulic lifting construction method for the outdoor truss steel structure according to claim 1, wherein the method comprises the following steps: the hierarchical unloading in step S5 is: 95%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%.
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| CN114319108A (en) * | 2021-11-30 | 2022-04-12 | 杭州地方铁路开发有限公司 | Hydraulic lifting and hoisting method for steel-concrete combined section |
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