Spatial rotary lifting control and construction method based on proportional control

Abstract

The invention discloses a spatial rotation lifting control and construction method based on proportional control, which comprises the following steps of: firstly, flatly placing facade rotation block units on a building and the ground as far as possible by taking the principle of minimum comprehensive assembly height as a principle for assembly, and then pre-lifting to a certain height; according to the principle that the real-time lifting height of the unit lifting stroke of each lifting point is kept in a constant proportional relation, oil way output is automatically controlled through a computer hydraulic control system, the blocking units are stably rotated to the design posture from the tire release posture and then lifted in place, and free-form surface steel structure construction is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of building steel structures, and more specifically to a space rotation lifting control and construction method based on proportional control. Background Art

[0002] With the vigorous growth of my country's economy, a large number of important transportation hub facilities such as airports and high-speed railway stations have been built in China in the past decade. The roof steel structures of these facilities are uniquely designed, generally adopt free-form surfaces, and have a wide plane size, which is specifically manifested in great width, depth and significant height differences. Therefore, technical means such as floor assembly, regional segmented lifting or gradual cumulative lifting are often used during construction. However, these methods are accompanied by problems such as high assembly position, frequent high-altitude operations, and cumbersome process flow, which in turn affect construction efficiency, increase safety risks, and pose challenges to quality control. As an environmentally friendly and innovative construction method, rotary lifting technology has shown significant advantages in reducing the height of structural assembly, but it is currently mainly used in situations where the structure is regular, the number of lifting points is limited, and it is close to two-point lifting. For curved structures with large spans, significant height differences, and free forms, there is currently a lack of mature construction solutions because multiple lifting points are required and synchronization control is extremely complex. Summary of the invention

[0003] The present invention provides a spatial rotation lifting control and construction method based on proportional control, aiming to solve the problems of insufficient structural safety and precision caused by poor synchronization during rotation operation of a free-form surface structure.

[0004] To achieve the above object, the present invention adopts the following technical solution: a space rotation lifting control and construction method based on proportional control, comprising the following steps:

[0005] Step 1: Place the block units on the floor and ground for horizontal assembly, install lifting equipment and measures at the lifting points and conduct inspection and debugging;

[0006] Step 2: After checking and debugging, lift the block unit vertically to a certain height, pause, and let it stand for about half a day, based on the principle that it will not collide or interfere with the lower assembly frame during the vertical rotation process;

[0007] Step 3: After checking that there are no abnormalities in the block units and equipment measures again, input the set lifting height value of each lifting point unit stroke into the computer hydraulic control system;

[0008] Step 4: Control each lifting point to lift upward through the computer hydraulic control system, and complete the proportional and smooth rotation and lifting of the block unit from the molded posture to the designed posture.

[0009] Step 5: Vertically lift the block unit that has been rotated to the design posture to the design elevation to complete the steel structure lifting operation.

[0010] Furthermore, based on the constant ratio between the real-time lifting height per unit stroke of each lifting point and the lifting height per unit stroke of the maximum lifting height point, during the lifting process, the computer hydraulic control system precisely controls the lifting process according to this proportional relationship. For lifting points with too fast lifting speed, the system will instruct the oil return to slow down; and for lifting points with slower lifting speed, they will be accelerated by increasing the oil supply.

[0011] Furthermore, the set lifting height value of the unit stroke of each lifting point is achieved by defining the total lifting stroke of all lifting points as H1~Hmax, where Hmax is the maximum lifting height point during the rotation process. Assuming that the rated stroke of the lifter used is Δh, after lifting n rated strokes, the remaining lifting height is the non-standard rated stroke s, and s<Δh, then Hmax=n×Δh+s, and the number of lifts required for each lifting point is N=n+1. Then the unit stroke of the maximum lifting height point is hmax=Hmax / (n+1), and the unit lifting stroke of the i-th point is hi=Hi / (n+1).

[0012] Furthermore, a high-precision configuration laser sensor is installed in the hydraulic lifting equipment to monitor and record the lifting height per unit stroke of each lifting point in real time and feed it back to the computer hydraulic control system.

[0013] In summary, the present invention first places the vertical rotating block units as flat as possible on the floor and ground for assembly based on the principle of minimum comprehensive assembly height, and then pre-lifts them to a certain height. The block units are based on the principle of "maintaining a constant proportional relationship between the lifting stroke of each lifting point unit in real time", and the computer hydraulic control system automatically controls the oil circuit output to achieve the block units to rotate smoothly from the molded posture to the designed posture and then lift them into place, completing the construction of the free-form steel structure. Compared with the prior art, it has the following beneficial effects:

[0014] (1) The function of synchronous lifting of multiple lifting points at different rates is realized, which can evenly and coordinately adjust the structure from the debonding posture to the designed posture. It effectively solves the risk of excessive force on local lifting points caused by the asynchrony between multiple lifting points caused by the inability of existing computer hydraulic control to adapt to rotary lifting construction, and the problem of extended construction period caused by frequent interruptions of lifting for adjustment;

[0015] (2) The method of the present invention is easy to operate and can realize automatic machine control of the entire process, thus saving manpower input. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of the spatial rotation and lifting construction method based on proportional control of the present invention;

[0017] Figure 2 This is a schematic diagram of the spatial rotation lifting control based on proportional control of the present invention;

[0018] Figure 3 This is a schematic diagram of the high-precision configuration laser sensor monitoring method. DETAILED DESCRIPTION

[0019] The following is combined with Figures 1 to 3 The specific implementation manner of the spatial rotation lifting control and construction method based on proportional control of the present invention is further described in detail.

[0020] like Figures 1 to 3 As shown, the present invention is a space rotation lifting control and construction method based on proportional control, including hydraulic lifting equipment 1, special steel strand 2, lifting frame 3, lower sling 4, assembly frame 5, block unit assembly state 6, block unit debonding state 7, block unit design state 8, block unit completion state 9, and computer hydraulic control system 10. The hydraulic lifting equipment 1 is equipped with a high-precision position laser sensor 11, which is used to monitor the lifting height per unit stroke of each lifting point in real time and feed it back to the computer hydraulic control system.

[0021] The invention comprises the following steps:

[0022] Step 1: First, the vertical rotating block unit is laid as flat as possible on the floor and ground for assembly based on the principle of minimum comprehensive assembly height (block unit assembly state 6), and the lifting frame 3 (upper hanging point) is set up as much as possible using steel columns, and the hydraulic lifting equipment 1 is installed. The temporary lower hanging device 4 (lower hanging point) is installed at the corresponding position of the upper and lower chords of the block unit structure and the temporary lifting rod and the upper hanging point, and the special steel strand 2 is installed between the upper and lower hanging points, and the hydraulic lifting equipment and lifting measures are checked and debugged;

[0023] Step 2: After confirmation, the assembled block unit is pre-lifted vertically to a certain height in principle without collision or interference with the lower assembly frame during the vertical rotation process, and then the lifting is suspended (block unit debonding state 7), and left to stand for about half a day;

[0024] Step 3: Check the block units and temporary hydraulic lifting measures again to see if there are any abnormalities. After confirming that there are no abnormalities, input the set lifting height value hi of each lifting point unit stroke into the computer hydraulic control system 10;

[0025] Step 4: Each lifting point is controlled to lift upward through the computer hydraulic control system 10. The system automatically controls the oil circuit output according to the real-time lifting height of each point fed back by the high-precision configuration laser sensor. For the lifting point with too fast lifting speed, the system will instruct its oil return to slow down; and for the lifting point with slow lifting speed, the oil supply is increased to speed up, so that the block unit is smoothly rotated from the molded posture 7 to the designed posture 8;

[0026] Step 5: Vertically lift the block unit that has been rotated to the design posture 8 to the design elevation (block unit completion state 9) to complete the steel structure lifting operation.

[0027] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A space rotation lifting control and construction method based on proportional control, characterized in that: The following steps are involved: Step 1: Place the block units on the floor and ground for horizontal assembly, install lifting equipment and measures at the lifting points and conduct inspection and debugging; Step 2: After checking and debugging, lift the block unit vertically to a certain height, pause, and let it stand for about half a day, based on the principle that it will not collide or interfere with the lower assembly frame during the vertical rotation process; Step 3: After checking that there are no abnormalities in the block units and equipment measures again, input the set lifting height value of each lifting point unit stroke into the computer hydraulic control system; Step 4: Control each lifting point to lift upward through the computer hydraulic control system, and complete the proportional and smooth rotation and lifting of the block unit from the molded posture to the designed posture. Step 5: Vertically lift the block unit that has been rotated to the design posture to the design elevation to complete the steel structure lifting operation.

2. The space rotation lifting control and construction method based on proportional control according to claim 1 is characterized in that: The computer hydraulic control system precisely regulates the lifting process according to the ratio between the real-time lifting height per unit stroke of each lifting point and the lifting height per unit stroke of the maximum lifting point. For the lifting point with too fast lifting speed, the system will instruct its oil return to slow down. For lifting points with slower lifting speed, the speed is increased by increasing the oil supply.

3. The space rotation lifting control and construction method based on proportional control according to claim 2 is characterized in that: The set lifting height value of the unit stroke of each lifting point is achieved by defining the total lifting stroke of all lifting points as H1~Hmax, where Hmax is the maximum lifting height point during the rotation process. Assuming that the rated stroke of the lifter used is Δh, after lifting n rated strokes, the remaining lifting height is the non-standard rated stroke s, and s<Δh, then Hmax=n×Δh+s, and the number of lifts required for each lifting point is N=n+1. The unit stroke of the maximum lifting height point is hmax=Hmax / (n+1), and the unit lifting stroke of the i-th point is hi=Hi / (n+1).

4. The space rotation lifting control and construction method based on proportional control according to claim 1 is characterized in that: The hydraulic lifting equipment is equipped with a high-precision configuration laser sensor for real-time monitoring and recording the lifting height per unit stroke of each lifting point and feeding it back to the computer hydraulic control system.

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