阅读说明：本技术 一种大跨度机库的施工方法 (Construction method of large-span hangar ) 是由 李景 杨伟 孙晓强 崔志玉 董志斌 刘辉 魏林生 于 2021-09-13 设计创作，主要内容包括：本发明公开了一种大跨度机库的施工方法,包括：将若干钢结构单元拼装成一钢结构整体提升单元并设置提升平台；安装液压同步提升系统并调试；将钢结构整体提升单元提升第一高度暂停提升,并继续提升至第二高度暂停提升以安装大门桁架与网架对接杆；将钢结构整体提升单元提升至距离安装标高一预设距离的第三高度暂停提升；降低钢结构整体提升单元的提升速度,对各个吊点微调,使钢结构整体提升单元到达设计位置；在钢结构整体提升单元与钢结构支撑架之间,以及钢结构整体提升单元与另一钢结构整体提升单元之间补装杆件。本发明能够解决现有机库施工方法中施工难度大,不利于钢结构现场安装的安全、质量以及工期的控制的技术问题。(The invention discloses a construction method of a large-span hangar, which comprises the following steps: assembling a plurality of steel structure units into a steel structure integral lifting unit and arranging a lifting platform; installing and debugging a hydraulic synchronous lifting system; lifting the steel structure integral lifting unit to a first height for suspension lifting, and continuously lifting to a second height for suspension lifting to install a gate truss and a net rack butt joint rod; lifting the steel structure integral lifting unit to a third height which is a preset distance away from the installation elevation for suspending lifting; reducing the lifting speed of the steel structure integral lifting unit, and finely adjusting each lifting point to enable the steel structure integral lifting unit to reach a designed position; and rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit. The invention can solve the technical problems of high construction difficulty and unfavorable control on the safety, quality and construction period of steel structure field installation in the existing hangar construction method.)

1. A construction method of a large-span hangar is characterized by comprising the following steps:

assembling a plurality of steel structure units into a steel structure integral lifting unit, and arranging a lifting platform on a roof structure layer of the steel structure integral lifting unit by using steel lattice columns and lifting supports;

installing a hydraulic synchronous lifting system, wherein the hydraulic synchronous lifting system comprises a hydraulic pump source system, a lifter and a displacement sensor;

installing a temporary lifting lower lifting point pipe at a position of a rod piece of the roof structure layer corresponding to the upper lifting point, and installing a bottom anchor and a steel strand between the lifting upper lifting point and the lifting lower lifting point;

debugging the hydraulic synchronous lifting system, and tensioning the steel strands to enable all the steel strands to be stressed uniformly;

checking whether all temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system meet design requirements, if so, loading step by step according to design load until the steel structure integral lifting unit is separated from the splicing platform;

lifting the steel structure integral lifting unit to a first height for a pause lifting, and adjusting the height of each lifting point in the steel structure integral lifting unit to enable the steel structure integral lifting unit to be kept horizontal and to be kept still for a preset time;

checking whether the temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system are abnormal or not again, and if not, formally lifting the steel structure integral lifting unit through the hydraulic synchronous lifting system;

lifting the steel structure integral lifting unit to a second height for suspending lifting, and installing a gate truss and net rack butt joint rod when the steel structure integral lifting unit is in a static state, so that the structure is lifted continuously after being integrated;

lifting the steel structure integral lifting unit to a third height which is a preset distance away from the installation elevation, suspending lifting, measuring the actual size of each point of the steel structure integral lifting unit and checking the actual size with a design value;

reducing the lifting speed of the steel structure integral lifting unit, continuously lifting the steel structure integral lifting unit to be close to the design position, and controlling the hydraulic synchronous lifting system to finely adjust each lifting point through a computer to enable the steel structure integral lifting unit to reach the design position;

rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the two steel structure integral lifting units and the steel structure supporting frame are integrated.

2. The construction method of the large-span hangar according to claim 1, characterized in that the step of installing a bottom anchor and a steel strand between the upper and lower hoisting points comprises:

each lifter corresponds to a set of bottom anchor, the bottom anchors are installed inside the temporary lifting appliance for lifting the lower lifting point, and each set of bottom anchor is vertically and concentrically installed with structural openings of the lifter and the lifting point right above the bottom anchor;

the steel strand adopts a bottom-to-top penetrating method, penetrates from the bottom to the top of the lifter and penetrates out, the bottom of each bundle of steel strands is kept flat, the upper end of the penetrated steel strand is fixed by a chuck and an anchor sheet, and the steel strand reserved at the top of each lifter is guided towards a preset direction along a guide frame;

and penetrating the lower end of the steel strand into a corresponding lower lifting point bottom anchor structure right below, adjusting the position and locking.

3. The construction method of the large-span hangar according to claim 1, characterized in that the step of debugging the hydraulic synchronous lifting system specifically comprises:

checking whether joints of all valves or oil pipes on the hydraulic pump source system are loosened, checking whether a pressure regulating spring of an overflow valve is in a completely loosened state, checking whether oil pipe connection between the hydraulic pump source system and a main oil cylinder of the lifter is correct, checking whether connection of a power line and a communication cable between a control cabinet of the hydraulic pump source system and the lifter is correct, manually operating corresponding buttons in the control cabinet, checking whether actions of an electromagnetic valve and a stop valve are normal, and checking whether a serial number of the stop valve corresponds to a serial number of a hydraulic ejector;

and starting the hydraulic synchronous lifting system to electrify the system and check whether the rotation direction of a main shaft of a hydraulic pump of the hydraulic pump source system is correct or not.

4. The construction method of the large-span hangar according to claim 1, characterized in that the step of loading step by step according to the design load until the steel structure integral lifting unit is separated from the assembly platform specifically comprises:

calculating the cylinder extending pressure and the cylinder retracting pressure of the lifter through a computer;

when the pilot lifting is started, the pressure of the extending cylinder of the lifter is controlled to be gradually increased to 20% and 40% of the required pressure, and under the condition that all the pressure is normal, the pressure is continuously loaded to 60%, 70%, 80%, 90%, 95% and 100%.

5. The construction method of the large-span hangar according to claim 1, characterized in that the steps of lifting the steel structure integral lifting unit for a first height and suspending the lifting, adjusting the height of each lifting point in the steel structure integral lifting unit, and keeping the steel structure integral lifting unit horizontal and standing for a preset time length specifically comprise:

lifting the steel structure integral lifting unit to a first height through the hydraulic synchronous lifting system, wherein the distance between the steel structure integral lifting unit and the assembling platform is about 150 mm;

the output pressure of the hydraulic synchronous lifting system is kept constant, so that the steel structure integral lifting unit stays in the air for a preset time, and the preset time is 4-12 h.

6. The construction method of the large-span hangar according to claim 1, characterized in that the step of lifting the steel structure integral lifting unit to a second height to suspend lifting, installing a gate truss and a net rack butt-joint rod when the steel structure integral lifting unit is in a static state, and continuing lifting after the structure is integrated specifically comprises:

lifting the steel structure integral lifting unit to a second height, wherein the second height is about 3m, and butting the steel structure integral lifting unit with a gate truss through a net rack butting rod to form a new steel structure integral lifting unit;

and resetting the displacement sensor by taking the height of each adjusted lifting point as a new initial position, and keeping the posture until the height is raised to a third height which is a preset distance away from the installation elevation in the integral lifting process.

7. The construction method of the large-span hangar according to claim 1, characterized in that the step of finely adjusting each hoisting point by controlling the hydraulic synchronous hoisting system through a computer to enable the steel structure integral hoisting unit to reach a designed position specifically comprises:

before the fine adjustment is started, the automatic mode of the computer synchronous control system is switched into a manual mode;

according to the measuring result, all the lifters of the steel structure integral lifting unit are subjected to synchronous fine adjustment or fine adjustment on a single lifter through the hydraulic synchronous lifting system, wherein the fine adjustment precision is in a millimeter level.

8. The construction method of the large-span hangar according to claim 1, characterized in that the steps of additionally installing rod members between the steel structure integral lifting unit and the steel structure support frame and between the steel structure integral lifting unit and another steel structure integral lifting unit to integrate the two steel structure integral lifting units with the steel structure support frame specifically include:

when the steel structure integral lifting unit reaches an elevation position, the hydraulic lifting system equipment stops working, and the air posture of the steel structure integral lifting unit is kept;

rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the steel structure integral lifting unit structure forms an integral stable stress system.

9. The construction method of the large-span hangar according to claim 1, characterized in that after the step of forming an integral stable stress system by the steel structure integral lifting unit structure, the method further comprises:

controlling all lifters of the hydraulic synchronous lifting system equipment to synchronously reduce pressure until all steel strands are completely loosened;

and dismantling the hydraulic synchronous lifting system equipment and related temporary measures to finish the integral lifting installation of the steel structure integral lifting unit.

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a construction method of a large-span hangar.

Background

In modern buildings, grid structure roofs are increasingly adopted, and the roof has the characteristics of light structure, high strength and low cost, is the most popular and developed structural form at present, and is widely applied to large and medium-span systems. With the application of large-scale steel structures in engineering, the reasonable consideration of the lifting of large-scale components becomes an important technical link in the construction of steel structures. Seen by combining practical situations, the synchronous lifting mode is adopted for the steel structure net rack, so that the synchronous lifting device has relatively great advantages.

However, the steel lattice column double-span hangar net rack combined member, the connection node structure and the stress are very complicated, and the construction technology level of the welding process and the installation and positioning requirements of the steel member is very high. If the split high-altitude bulk loading is adopted, not only is the high-altitude assembly and welding workload large, but also the field mechanical equipment is difficult to meet the hoisting requirement, and the required high-altitude assembly rack is difficult to erect, so that great safety and quality risks exist. The difficulty of construction is big, is unfavorable for the control of safety, quality and the time limit for a project of steel construction field installation.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a construction method of a large-span hangar, aiming at solving the technical problems that the construction difficulty is high in the existing hangar construction method, and the control on the safety, quality and construction period of the steel structure field installation is not facilitated.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose: a construction method of a large-span hangar, the method comprising:

assembling a plurality of steel structure units into a steel structure integral lifting unit, and arranging a lifting platform on a roof structure layer of the steel structure integral lifting unit by using steel lattice columns and lifting supports;

installing a hydraulic synchronous lifting system, wherein the hydraulic synchronous lifting system comprises a hydraulic pump source system, a lifter and a displacement sensor;

installing a temporary lifting lower lifting point pipe at a position of a rod piece of the roof structure layer corresponding to the upper lifting point, and installing a bottom anchor and a steel strand between the lifting upper lifting point and the lifting lower lifting point;

debugging the hydraulic synchronous lifting system, and tensioning the steel strands to enable all the steel strands to be stressed uniformly;

checking whether all temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system meet design requirements, if so, loading step by step according to design load until the steel structure integral lifting unit is separated from the splicing platform;

lifting the steel structure integral lifting unit to a first height for a pause lifting, and adjusting the height of each lifting point in the steel structure integral lifting unit to enable the steel structure integral lifting unit to be kept horizontal and to be kept still for a preset time;

checking whether the temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system are abnormal or not again, and if not, formally lifting the steel structure integral lifting unit through the hydraulic synchronous lifting system;

lifting the steel structure integral lifting unit to a second height for suspending lifting, and installing a gate truss and net rack butt joint rod when the steel structure integral lifting unit is in a static state, so that the structure is lifted continuously after being integrated;

lifting the steel structure integral lifting unit to a third height which is a preset distance away from the installation elevation, suspending lifting, measuring the actual size of each point of the steel structure integral lifting unit and checking the actual size with a design value;

reducing the lifting speed of the steel structure integral lifting unit, continuously lifting the steel structure integral lifting unit to be close to the design position, and controlling the hydraulic synchronous lifting system to finely adjust each lifting point through a computer to enable the steel structure integral lifting unit to reach the design position;

rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the two steel structure integral lifting units and the steel structure supporting frame are integrated.

According to one aspect of the above technical scheme, the step of installing the bottom anchor and the steel strand between the upper hoisting point and the lower hoisting point comprises the following steps:

each lifter corresponds to a set of bottom anchor, the bottom anchors are installed inside the temporary lifting appliance for lifting the lower lifting point, and each set of bottom anchor is vertically and concentrically installed with structural openings of the lifter and the lifting point right above the bottom anchor;

the steel strand adopts a bottom-to-top penetrating method, penetrates from the bottom to the top of the lifter and penetrates out, the bottom of each bundle of steel strand is kept level, the upper end of the penetrated steel strand is fixed by a chuck and an anchor sheet, and the steel strand reserved at the top of each lifter is guided towards a preset direction along a guide frame

And penetrating the lower end of the steel strand into a corresponding lower lifting point bottom anchor structure right below, adjusting the position and locking.

According to one aspect of the above technical solution, the step of debugging the hydraulic synchronous lifting system specifically includes:

checking whether joints of all valves or oil pipes on the hydraulic pump source system are loosened, checking whether a pressure regulating spring of an overflow valve is in a completely loosened state, checking whether oil pipe connection between the hydraulic pump source system and a main oil cylinder of the lifter is correct, checking whether connection of a power line and a communication cable between a control cabinet of the hydraulic pump source system and the lifter is correct, manually operating corresponding buttons in the control cabinet, checking whether actions of an electromagnetic valve and a stop valve are normal, and checking whether a serial number of the stop valve corresponds to a serial number of a hydraulic ejector;

and starting the hydraulic synchronous lifting system to electrify the system and check whether the rotation direction of a main shaft of a hydraulic pump of the hydraulic pump source system is correct or not.

According to one aspect of the above technical scheme, the step of loading step by step according to design load until the steel structure integral lifting unit breaks away from the assembly platform specifically includes:

calculating the cylinder extending pressure and the cylinder retracting pressure of the lifter through a computer;

when the pilot lifting is started, the pressure of the extending cylinder of the lifter is controlled to be gradually increased to 20% and 40% of the required pressure, and under the condition that all the pressure is normal, the pressure is continuously loaded to 60%, 70%, 80%, 90%, 95% and 100%.

According to one aspect of the above technical scheme, the step of lifting the steel structure integral lifting unit to a first height for suspension lifting, adjusting the height of each lifting point in the steel structure integral lifting unit, keeping the steel structure integral lifting unit horizontal and standing for a preset time specifically comprises:

lifting the steel structure integral lifting unit to a first height through the hydraulic synchronous lifting system, wherein the distance between the steel structure integral lifting unit and the assembling platform is about 150 mm;

the output pressure of the hydraulic synchronous lifting system is kept constant, so that the steel structure integral lifting unit stays in the air for a preset time, and the preset time is 4-12 h.

According to the one hand of above-mentioned technical scheme, with the whole lifting unit of steel construction promotes to the second height and suspends the promotion install gate truss and rack butt joint pole when the whole lifting unit of steel construction is in quiescent condition, make the structure form the step that continues to promote after whole, specifically include:

lifting the steel structure integral lifting unit to a second height, wherein the second height is about 3m, and butting the steel structure integral lifting unit with a gate truss through a net rack butting rod to form a new steel structure integral lifting unit;

and resetting the displacement sensor by taking the height of each adjusted lifting point as a new initial position, and keeping the posture until the height is raised to a third height which is a preset distance away from the installation elevation in the integral lifting process.

According to one aspect of the above technical scheme, the step of finely adjusting each hoisting point by the hydraulic synchronous lifting system through computer control to enable the steel structure integral lifting unit to reach the design position specifically comprises:

before the fine adjustment is started, the automatic mode of the computer synchronous control system is switched into a manual mode;

according to the measuring result, all the lifters of the steel structure integral lifting unit are subjected to synchronous fine adjustment or fine adjustment on a single lifter through the hydraulic synchronous lifting system, wherein the fine adjustment precision is in a millimeter level.

According to an aspect of the above technical solution, the step of additionally installing rod members between the steel structure integral lifting unit and the steel structure support frame and between the steel structure integral lifting unit and another steel structure integral lifting unit to integrate the two steel structure integral lifting units with the steel structure support frame specifically includes:

when the steel structure integral lifting unit reaches an elevation position, the hydraulic lifting system equipment stops working, and the air posture of the steel structure integral lifting unit is kept;

rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the steel structure integral lifting unit structure forms an integral stable stress system.

According to an aspect of the above technical solution, after the step of forming an overall stable stress system by the steel structure overall lifting unit structure, the method further includes:

controlling all lifters of the hydraulic synchronous lifting system equipment to synchronously reduce pressure until all steel strands are completely loosened;

and dismantling the hydraulic synchronous lifting system equipment and related temporary measures to finish the integral lifting installation of the steel structure integral lifting unit.

Compared with the prior art, the invention has the beneficial effects that: the net racks (namely the integral lifting platform) of the two hangars are independent before lifting, so that the working area can be effectively increased; the requirement on hoisting equipment can be reduced, and the construction is convenient; meanwhile, the erection of a hangar installation platform can be reduced, and the installation height can be reduced; therefore, the method of the invention can greatly reduce the occupation amount of high-quality labor resources and materials.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow chart of a construction method of a large-span hangar in a first embodiment of the invention;

FIG. 2 is a schematic elevation view of the integral lift platform in an initial state according to the first embodiment of the present invention;

FIG. 3 is an elevational view of the integral lift platform at a first elevation in accordance with the first embodiment of the present invention;

FIG. 4 is a schematic elevation view of the integrated lift platform in a design position according to the first embodiment of the present invention;

FIG. 5 is a schematic drawing of the hydraulic synchronizing system shown in a disassembled elevational view in a first embodiment of the present invention;

fig. 6 is a schematic structural view of a steel structural support frame according to a first embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are used for descriptive purposes only and not for purposes of indicating or implying that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the invention, the engineering lifting area is a roof grid structure at the top of the hangar, the span of the grid is 60+60m, the column spacing is 10m, the lower chord support is adopted, the three sides support is adopted, and one side is open. The height of the center of the lower chord of the net rack is 22.00m, the spherical nodes are welded, the net rack is in the form of a two-layer square pyramid net rack, the size of a basic grid is 5mx5m, the opening edge of the gate is provided with a gate back beam, the lower back height is 3m, and the thickness of the end part is 3.50 m. The maximum installation elevation of the steel structure is +27.5m, the lifting range is 3-15 axial intersection lines between 0/A and H, the lifting height is about 22m, and the total lifting weight of the net rack and the attached structures (purlines, streets and the like) is about 380 t.

Referring to fig. 2-6, there are shown an integral lifting platform 10, a lifter 20, and a steel structure support frame 30.

Referring to fig. 1, a first embodiment of the present invention provides a method for constructing a large-span hangar, which is used for the construction of the large-span hangar, and the method includes steps S10-S100:

step S10, assembling a plurality of steel structure units into a steel structure integral lifting unit, and arranging a lifting platform on a roof structure layer of the steel structure integral lifting unit by using steel lattice columns and lifting supports;

the steel structure unit is formed by welding a plurality of rod pieces in a special shape, and in order to ensure the corrosion resistance of the steel structure integral lifting unit, the surface of the steel structure integral lifting unit can be subjected to surface treatment, such as paint spraying on the surface of the steel structure integral lifting unit, so that the structural new performance of the steel structure integral lifting unit is not influenced, the corrosion resistance can be effectively improved, and the service life is prolonged;

step S20, installing a hydraulic synchronous lifting system, wherein the hydraulic synchronous lifting system comprises a hydraulic pump source system, a lifter and a displacement sensor;

the hydraulic synchronous lifting system is used for lifting the steel structure integral lifting unit, a hydraulic pump source system of the hydraulic synchronous lifting system is connected with a pipeline of the lifter, and pressure is output to the lifter through the hydraulic pump source system, so that the movable end of the lifter can drive the integral lifting platform to lift;

at the moment, in order to obtain the lifting condition of the integral lifting platform, a plurality of displacement sensors are arranged on the integral lifting platform, and displacement signals are fed back to the computer system through the displacement sensors, so that the lifting degree of the integral lifting platform can be obtained.

Install displacement sensor A and displacement sensor B on the whole lift platform, displacement sensor A and displacement sensor B are located the both ends that whole lift platform kept away from each other respectively, and both are in same high horizontal plane, if displacement sensor A feeds back the one end lifting height of whole lift platform and is 1m, and displacement sensor B feeds back the other end lifting height of whole lift platform and is 0.8m, then through the data of displacement sensor feedback, can judge that steel construction whole lift unit is in the tilt state this moment, then hydraulic pump source system need control a plurality of lifters on the steel construction whole lift unit respectively, respectively to these lifters output different pressures, so that whole lift platform resumes the horizontality fast.

Step S30, mounting a temporary lifting lower lifting point pipe at a position of the rod piece of the roof structure layer corresponding to the upper lifting point, and mounting a bottom anchor and a steel strand between the lifting upper lifting point and the lifting lower lifting point;

step S40, debugging the hydraulic synchronous lifting system, and tensioning the steel strands to enable all the steel strands to be stressed uniformly;

after the hydraulic synchronous system, the bottom anchor and the steel strand are installed, the hydraulic synchronous lifting system needs to be debugged, so that the hydraulic synchronous lifting system can generate enough lifting traction force for the steel structure integral lifting unit.

Step S50, checking whether all temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system meet design requirements, if so, loading step by step according to design load until the steel structure integral lifting unit is separated from the assembly platform;

the temporary measures between the steel structure integral lifting unit and the hydraulic synchronous lifting system comprise reinforcing rods, connecting cables and the like, and are used for guaranteeing the structural stability between the steel structure integral lifting unit and the hydraulic synchronous lifting system, when all the temporary measures meet design requirements, the stress condition of the steel structure integral lifting unit during lifting can be simulated and calculated through a computer, and the simulation process is completely lifted step by step according to design loads, such as 5%, 10%, 20% and the like of the design loads.

Step S60, lifting the steel structure integral lifting unit to a first height for suspension lifting, and adjusting the height of each lifting point in the steel structure integral lifting unit to keep the steel structure integral lifting unit horizontal and standing for a preset time;

wherein, the first height is 150mm in the middle of this embodiment, also the bottom surface of steel construction integral lifting unit apart from the bottom surface is 150mm, the lifting is suspended after the steel construction integral lifting unit promotes the first height, correspond the control lifting ware through hydraulic pressure synchronous lifting system this moment, the control lifting ware increases pressure or reduces pressure, thereby play the adjustment to each hoisting point height in the steel construction integral lifting unit, thereby make the steel construction integral lifting unit keep the level, and it is long to stew a preset time after the steel construction integral lifting unit keeps the level. In this embodiment, the preset duration is 12 hours, and the integral lifting platform can be adjusted within the period of standing for 12 hours, and after the standing time is over, the integral lifting platform can be formally lifted.

Step S70, checking whether the temporary measures of the steel structure integral lifting unit and the hydraulic synchronous lifting system are abnormal or not again, if not, formally lifting the steel structure integral lifting unit through the hydraulic synchronous lifting system;

step S80, lifting the steel structure integral lifting unit to a second height for suspending lifting, and installing a gate truss and net rack butt joint rod when the steel structure integral lifting unit is in a static state, so that the structure is lifted continuously after being integrated;

and when the steel structure integral lifting unit is lifted to a position of about 3m, the hydraulic synchronous lifting system suspends the lifting of the steel structure integral lifting unit to enable the steel structure integral lifting unit to stand still, and the gate truss and the net rack butt-joint rod are installed on the steel structure integral lifting unit, so that the steel structure integral lifting unit and the gate truss form a whole.

Step S90, lifting the steel structure integral lifting unit to a third height which is a preset distance away from the installation elevation, suspending lifting, measuring the actual size of each point of the steel structure integral lifting unit and checking the actual size with a design value;

the preset distance is about 200mm, when the steel structure integral lifting unit is lifted to a distance of 200mm from the installation elevation, the lifting of the steel structure integral lifting unit is suspended, the actual size between each point of the steel structure integral lifting unit is measured, and the actual size is compared with a design value to judge whether the steel structure integral lifting unit deforms or not in the lifting process.

S100, reducing the lifting speed of the steel structure integral lifting unit, continuously lifting the steel structure integral lifting unit to be close to a design position, and controlling the hydraulic synchronous lifting system to finely adjust each lifting point through a computer to enable the steel structure integral lifting unit to reach the design position;

the steel structure integral lifting unit is lifted to a position 200mm away from the installation elevation for suspension lifting, and the lifting speed of the steel structure integral lifting unit is reduced to effectively ensure the lifting precision due to the fact that the steel structure integral lifting unit is closer to the installation elevation. When the lifting unit is lifted to a position close to the installation height, the hydraulic synchronous lifting system is controlled by the computer to finely adjust each lifting point, so that each point of the steel structure integral lifting unit can accurately reach a designed position, and the requirement for accurate butt joint with another steel structure integral lifting unit and a steel structure support frame on the next step is met.

And S110, rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure support frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the two steel structure integral lifting units and the steel structure support frame form a whole.

Specifically, the steel structure integral lifting units are two groups, and the two groups of steel structure integral lifting units are lifted to the position of an installation elevation by the same lifting method. At this moment, the height of the two groups of steel structure integral lifting units in the air is consistent, so that the rod pieces are additionally arranged between the two groups of steel structure integral lifting units, the rod pieces are additionally arranged between the steel structure integral lifting units and the steel structure supporting frame, and the two groups of steel structure integral lifting units and the steel structure supporting frame can be connected into a whole.

By adopting the construction method of the large-span hangar shown in the embodiment, the net racks (namely, the integral lifting platform) of the two hangars are independent before lifting, so that the working surface can be effectively increased; the requirement on hoisting equipment can be reduced, and the construction is convenient; meanwhile, the erection of an installation platform and the installation height can be reduced; therefore, the method shown in the embodiment can greatly reduce the occupation amount of high-quality labor resources and materials.

A second embodiment of the present invention provides a construction method for a large-span hangar, in this embodiment:

the step of installing end anchor and steel strand between hoisting point about promoting specifically includes:

each lifter corresponds to a set of bottom anchor, the bottom anchors are installed inside the temporary lifting appliance for lifting the lower lifting point, and each set of bottom anchor is vertically and concentrically installed with structural openings of the lifter and the lifting point right above the bottom anchor;

the steel strand adopts a bottom-to-top penetrating method, penetrates from the bottom to the top of the lifter and penetrates out, the bottom of each bundle of steel strand is kept level, the upper end of the penetrated steel strand is fixed by a chuck and an anchor sheet, and the steel strand reserved at the top of each lifter is guided towards a preset direction along a guide frame

And penetrating the lower end of the steel strand into a corresponding lower lifting point bottom anchor structure right below, adjusting the position and locking.

In this embodiment, the step of debugging the hydraulic synchronous lifting system specifically includes:

checking whether joints of all valves or oil pipes on the hydraulic pump source system are loosened, checking whether a pressure regulating spring of an overflow valve is in a completely loosened state, checking whether oil pipe connection between the hydraulic pump source system and a main oil cylinder of the lifter is correct, checking whether connection of a power line and a communication cable between a control cabinet of the hydraulic pump source system and the lifter is correct, manually operating corresponding buttons in the control cabinet, checking whether actions of an electromagnetic valve and a stop valve are normal, and checking whether a serial number of the stop valve corresponds to a serial number of a hydraulic ejector;

and starting the hydraulic synchronous lifting system to electrify the system and check whether the rotation direction of a main shaft of a hydraulic pump of the hydraulic pump source system is correct or not.

In this embodiment, load step by step according to design load until the step that steel construction integral lifting unit breaks away from the assembly platform specifically includes:

calculating the cylinder extending pressure and the cylinder retracting pressure of the lifter through a computer;

when the pilot lifting is started, the pressure of the extending cylinder of the lifter is controlled to be gradually increased to 20% and 40% of the required pressure, and under the condition that all the pressure is normal, the pressure is continuously loaded to 60%, 70%, 80%, 90%, 95% and 100%.

In this embodiment, will the first height of steel construction overall lifting unit promotion suspends the promotion, adjusts the height of each hoisting point in the steel construction overall lifting unit makes the steel construction overall lifting unit keeps the level and stews for a step of predetermineeing for a long time, specifically includes:

lifting the steel structure integral lifting unit to a first height through the hydraulic synchronous lifting system, wherein the distance between the steel structure integral lifting unit and the assembling platform is about 150 mm;

the output pressure of the hydraulic synchronous lifting system is kept constant, so that the steel structure integral lifting unit stays in the air for a preset time, and the preset time is 4-12 h.

In this embodiment, will the steel construction lifting unit lifts to the second height and suspends the promotion installation gate truss and rack butt joint pole when the steel construction lifting unit is in quiescent condition, continues the step of promoting after making the structure form wholly, specifically includes:

lifting the steel structure integral lifting unit to a second height, wherein the second height is about 3m, and butting the steel structure integral lifting unit with a gate truss through a net rack butting rod to form a new steel structure integral lifting unit;

and resetting the displacement sensor by taking the height of each adjusted lifting point as a new initial position, and keeping the posture until the height is raised to a third height which is a preset distance away from the installation elevation in the integral lifting process.

In this embodiment, the step of finely adjusting each hoisting point by the hydraulic synchronous lifting system under the control of a computer to enable the steel structure integral lifting unit to reach the designed position specifically includes:

before the fine adjustment is started, the automatic mode of the computer synchronous control system is switched into a manual mode;

according to the measuring result, all the lifters of the steel structure integral lifting unit are subjected to synchronous fine adjustment or fine adjustment on a single lifter through the hydraulic synchronous lifting system, wherein the fine adjustment precision is in a millimeter level.

In this embodiment, between whole lifting unit of steel construction and the steel construction support frame, and the member of repacking between whole lifting unit of steel construction and another steel construction whole lifting unit makes two whole lifting unit of steel construction and steel construction support frame form holistic step, specifically include:

when the steel structure integral lifting unit reaches an elevation position, the hydraulic lifting system equipment stops working, and the air posture of the steel structure integral lifting unit is kept;

rod pieces are additionally arranged between the steel structure integral lifting unit and the steel structure supporting frame and between the steel structure integral lifting unit and the other steel structure integral lifting unit, so that the steel structure integral lifting unit structure forms an integral stable stress system.

In this embodiment, after the step of forming the integral stable stress system by the steel structure integral lifting unit structure, the method further includes:

controlling all lifters of the hydraulic synchronous lifting system equipment to synchronously reduce pressure until all steel strands are completely loosened;

and dismantling the hydraulic synchronous lifting system equipment and related temporary measures to finish the integral lifting installation of the steel structure integral lifting unit.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.