Method for realizing synchronous lifting of hydraulic lifters with different specifications

Abstract

The invention belongs to the technical field of steel cable type hydraulic lifter construction, and particularly relates to a method for achieving synchronous lifting of hydraulic lifters of different specifications. The static leveling instrument is used for monitoring the synchronization condition of each lifting point in the lifting process in real time, and a traditional mode that a total station is used for positioning the aerial state of a lifting target is replaced; the method for evaluating the synchronous lifting state of the lifting target is designed, the relative vertical displacement of each lifting point under the same lifting time can be visually reflected through the static leveling instrument, the asynchronous lifting difference value between the lifting points is directly judged, and the complex calculation process is omitted. According to the method, real-time synchronous lifting monitoring can be realized, and when the asynchronous lifting difference value reaches the asynchronous lifting limit value, the abnormal condition of synchronous lifting can be directly reminded. The synchronous lifting condition of each lifting point can be visually compared in real time. When asynchronous lifting occurs, the hydraulic lifter can be quickly and effectively guided to adjust the height of each lifting point, and the synchronous lifting state of the lifting target is recovered.

Description

Technical Field

[0001] The invention belongs to the technical field of steel cable type hydraulic lifter construction, and in particular relates to a method for realizing synchronous lifting of hydraulic lifters of different specifications. Background Art

[0002] The steel cable hydraulic lifter is widely used in the overall lifting and installation of components, unloading and installation of heavy equipment. In the field of oblique tensioning during the lifting or horizontal pulling and installation of extra-large and heavy parts, the steel cable hydraulic lifter has unparalleled advantages over other equipment. The cable hydraulic lifting device has been successfully applied in the installation and construction of large and heavy equipment, and is widely used in the installation of metallurgy, construction, chemical industry, municipal administration, bridges, railways and other fields.

[0003] During the use of the steel cable hydraulic lifter, according to the size and weight of the lifting target, the lifting weight, span and area are not restricted through the expansion combination of the lifting equipment. The lifting process is very safe, and the components can be locked at any position during the lifting process. Any lifter can also be adjusted individually with high adjustment accuracy, which effectively improves the controllability of the installation accuracy during the structure lifting process. Flexible rigging is used to bear the load. As long as there are reasonable load-bearing hanging points, the lifting height is not restricted; the lifting equipment is small in size, light in weight, and has a large carrying capacity, which is particularly suitable for the lifting operation of large equipment. During use, the control method for synchronous lifting is often to locate the lifting target through a total station to measure the safety of the lifting construction process.

[0004] During the lifting process of large-size structures, due to the asymmetry of the structure itself, the offset of the center of gravity, the hollowing of the structure, etc., it is necessary to use steel cable hydraulic lifters of different specifications and brands; and the limitation of the target height and the space where the lifter is arranged may also require the use of steel cable hydraulic lifters of different specifications and brands. During use, the control method for synchronous lifting is often to locate the lifting target through a total station to measure the safety of the lifting construction process. This monitoring method requires technicians to monitor and calculate in real time whether the lifting points of the lifting target are in a synchronous lifting state. The operation is difficult, the calculation is complex, and it is time-consuming and laborious. There is no simple, intuitive, and clear synchronous lifting control method. Summary of the invention

[0005] The purpose of the present invention is to provide a method for achieving synchronous lifting of hydraulic lifters of different specifications. In the construction of a high-rise tower-podium asymmetric large-span steel structure corridor, the synchronous lifting can be simply and intuitively monitored to reduce the risk of overturning of the lifting target caused by asynchronous lifting, prevent the danger of exceeding the working load of a single hydraulic lifter due to asynchronous lifting, prevent the danger of the steel strand bearing exceeding the maximum bearing capacity due to asynchronous lifting, and prevent the problem of irreversible deformation of the lifting target and damage caused by asynchronous lifting.

[0006] The method for realizing synchronous lifting of hydraulic lifters of different specifications comprises the following steps:

[0007] Step 1: After installing the lifting platform and hydraulic lifter, install multiple sets of lifting devices on the top surface of the target to be lifted, and each set of lifting devices is connected to a corresponding set of hydraulic lifters through steel strands;

[0008] Step 2: Set marking points on each group of spreaders. The marking points of all spreaders are on the same horizontal line. Number each marking point in sequence and install a static level at each marking point.

[0009] Step 3: Each group of hydraulic lifters of different specifications starts working and lifts the target synchronously; during the lifting process, every time the target reaches the single rated height of the hydraulic lifter, monitor whether each group of hydraulic lifters is lifted synchronously based on the measurement values ​​of the static level at each marking point.

[0010] Furthermore, in step 3, the measured value a of the static level at each marking point is i (t), take the distance d between any two marked points ij 0.005 times of is the maximum asynchronous lifting difference;

[0011] For a total of n marking points, take all pairs of corresponding and non-repeating marking point combinations to form a set E = {(i, j)};

[0012] Calculate the maximum asynchronous lifting difference corresponding to each set of marking point combinations and the absolute value of the difference between the static level measurement values, and take the ratio of the absolute value of the difference between the static level measurement values ​​and the maximum asynchronous lifting difference of all marking point combinations as the evaluation value D of the set of marking point combinations. ij (t); Calculate the sum of the evaluation values ​​of all group mark point combinations A(t);

[0013]

[0014] If A(t)<0.75, the next rated height lifting of each group of hydraulic lifters will be carried out normally;

[0015] If 0.75≤A(t)<0.9, then pay attention to the target's posture to prevent overturning and displacement, and each group of hydraulic lifters will slow down and lift;

[0016] If A(t)≥0.9, stop lifting and adjust each group of hydraulic lifters.

[0017] Furthermore, the specific method for adjusting each group of hydraulic lifters is:

[0018] Step 4.1: Calculate the average value of the static level measurement at each marked point Locate the marking points corresponding to the maximum and minimum values ​​of the static level, adjust the hydraulic lifters corresponding to the two marking points, and adjust the length of the steel strand to make the readings of the static level at the two marking points reach the average value.

[0019] Step 4.2: Calculate the sum of the evaluation values ​​of all group mark point combinations A(t); if A(t)≥0.5, return to step 4.1; if A(t)<0.5, complete the adjustment of each group of hydraulic lifters and start the next rated height lift.

[0020] The beneficial effects of the present invention are:

[0021] The present invention uses a static level to monitor the synchronization of each lifting point in the lifting process in real time, replacing the traditional method of using a total station to locate the aerial state of the lifting target; the present invention designs a method for evaluating the synchronous lifting state of the lifting target, and the static level can intuitively reflect the relative vertical displacement of each lifting point under the same lifting time, directly judge the asynchronous lifting difference between each lifting point, and eliminate the complicated calculation process. The present invention can realize real-time synchronous lifting monitoring, and when the asynchronous lifting difference reaches the asynchronous lifting limit, it can directly remind the abnormal situation of synchronous lifting. The present invention can intuitively compare the synchronous lifting situation of each lifting point in real time. When asynchronous lifting occurs, it can quickly and effectively guide the hydraulic lifter to adjust the height of each lifting point to restore the synchronous lifting state of the lifting target. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a construction diagram of the asymmetric large-span steel structure corridor between the high-rise tower and the podium.

[0023] Figure 2 This is a schematic diagram of the hydraulic lift installation.

[0024] Figure 3 It is a schematic diagram of the sling.

[0025] Figure 4 This is a schematic diagram of the installation of the static level on the sling.

[0026] Figure 5It is a working schematic diagram of the hydraulic lifter. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings.

[0028] In the construction of the high-rise tower-podium asymmetric large-span steel structure corridor, after installing the lifting platform 1 and the hydraulic lifter 2, the lifting target 3 is moved to the position just below the target. After that, the hoist 4 is installed. After the installation of the hoist is completed, the hoist 4 is connected to the hydraulic lifter 2 through the steel strand 5.

[0029] The installation diagram of the hydraulic lifter is as follows: Figure 2 As shown, the extended steel strands are led out along the guide frame and fall naturally. Thus, the hydraulic lifter 2 installed on the lifting platform 1 is connected with the lower hanging point 4 installed on the lifting weight 3 through the steel strands 5, and the extended steel strands are naturally led out through the guide frame, forming a complete lifting system.

[0030] The structural diagram of the sling 4 is as follows Figure 3 As shown. Mark a point on each sling 4 so that these points are on the same horizontal line. Install a static level 6 with this point as the center. The static level is a sensor for vertical displacement monitoring. The basic principle of the static level based on pressure measurement is that the water pressure measured by the sensor can be converted into a distance value. According to the pressure measured by the sensor, the data acquisition instrument connected to it can convert the relative vertical displacement of the monitoring point in real time. The static level transmits data to the control system on the lifting platform 1 in real time through wireless signals to form a complete real-time monitoring system.

[0031] Figure 5 It is a schematic diagram of the cyclic lifting work of the hydraulic lifter. After tightening the steel strand 5, the synchronous lifting work begins. In the lifting preparation stage, the lower anchor 7 of the hydraulic lifter is loosened, and the upper anchor 8 is tightened and clamped to the steel strand 5; then the oil cylinder 9 synchronously lifts the lifting target 3 to reach the single rated height of the lifter and stops; the lower anchor 7 is tightened and the steel strand 5 is clamped; the oil cylinder 9 shrinks slightly, and the upper anchor 8 is disengaged and relaxed; the upper anchor 8 rises, and the upper anchor 8 is completely relaxed; the main oil cylinder 9 retracts to its original position, and the upper anchor 8 clamps the steel strand, preparing for the next cyclic synchronous lifting. The detection of the synchronous lifting state is carried out during the lifting cycle. When the oil cylinder 9 synchronously lifts the heavy object to the single rated height of the lifter, the relative displacement of the lifting points recorded by each static level 6 is read.

[0032] In order to prevent the lifting target from tipping over and tilting, it is necessary to develop a method to evaluate the lifting status of each lifting point at the same time. ij0.005 times of is the maximum asynchronous lifting difference. For a total of n marking points, take all pairs of corresponding and non-repeating marking point combinations to form a set E = {(i, j)}; calculate the maximum asynchronous lifting difference corresponding to each group of marking point combinations and the absolute value of the difference in the measured value of the static level, and take the ratio of the absolute value of the difference in the measured value of the static level to the maximum asynchronous lifting difference of all marking point combinations as the evaluation value D of the group of marking point combinations ij (t); Calculate the sum of the evaluation values ​​of all group mark point combinations A(t);

[0033]

[0034] At the same time, if A(t)<0.75, the next rated height lifting of each group of hydraulic lifters will be carried out normally; if 0.75≤A(t)<0.9, attention will be paid to the posture of the target to prevent overturning and displacement, and each group of hydraulic lifters will slow down and lift; if A(t)≥0.9, lifting will be suspended and each group of hydraulic lifters will be adjusted.

[0035] The method for adjusting each group of hydraulic lifters is:

[0036] Step 1: Calculate the average value of the static level measurement at each marked point Locate the marking points corresponding to the maximum and minimum values ​​of the static level, adjust the hydraulic lifters corresponding to the two marking points, and adjust the length of the steel strand to make the readings of the static level at the two marking points reach the average value.

[0037] Step 2: Calculate the sum of the evaluation values ​​of all group mark point combinations A(t); if A(t)≥0.5, return to step 4.1; if A(t)<0.5, complete the adjustment of each group of hydraulic lifters and start the next rated height lift.

[0038] The lifting can be restarted only when the sum of the asynchronous lifting evaluation values ​​of each group of lifting points is less than 0.5.

[0039] When the lifting target 3 reaches the target height, the relative displacement of each lifting point is compared, and the hydraulic lifter 2 is used to fine-tune each lifting point so that each lifting point is on the same horizontal line and the lifting target 3 is in a horizontal state, which is convenient for subsequent installation and construction.

[0040] After confirming that the lifting target 3 is level, tighten the steel strands 5 at each lifting point, reset the static level count at each lifting point, and restart the test. During the installation and construction process, always pay attention to the value changes of the static level 6 to ensure that the lifting target 3 does not have a relative vertical displacement during the installation, welding, and translation process, to ensure the stability of the lifting target 3 and prevent the lifting target 3 from overturning.

[0041] After the installation of lifting target 3 is completed, the data of static level 6 is read to evaluate whether each lifting point is at the same horizontal plane, to ensure that lifting target 3 is level, and to ensure that lifting target 3 will not be unstable and fall off after unloading, and then start unloading. The hydraulic lifting system equipment 2 is decompressed synchronously until the steel strand 5 is completely relaxed; the hydraulic lifting system equipment 2 and related temporary measures are removed to complete the overall lifting installation of lifting target 3.

[0042] The traditional method of using a total station to locate the aerial status of the lifting target and calculate and evaluate the synchronous lifting status of the lifting target cannot achieve real-time monitoring and evaluation of the synchronous lifting status during the lifting process. It is necessary to divide the lifting process into several sections and pause the lifting for evaluation after reaching the target height. This prolongs the time of lifting construction and hinders the construction progress.

[0043] The present invention uses a static level to monitor the synchronization of each lifting point in the lifting process in real time, replacing the traditional method of using a total station to locate the aerial state of the lifting target; the present invention designs a method for evaluating the synchronous lifting state of the lifting target, and the static level can intuitively reflect the relative vertical displacement of each lifting point under the same lifting time, directly judge the asynchronous lifting difference between each lifting point, and eliminate the complicated calculation process. The present invention can realize real-time synchronous lifting monitoring, and when the asynchronous lifting difference reaches the asynchronous lifting limit, it can directly remind the abnormal situation of synchronous lifting. The present invention can intuitively compare the synchronous lifting situation of each lifting point in real time. When asynchronous lifting occurs, it can quickly and effectively guide the hydraulic lifter to adjust the height of each lifting point to restore the synchronous lifting state of the lifting target.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for achieving synchronous lifting of hydraulic lifters of different specifications, characterized in that: The following steps are involved: Step 1: After installing the lifting platform and hydraulic lifter, install multiple sets of lifting devices on the top surface of the target to be lifted, and each set of lifting devices is connected to a corresponding set of hydraulic lifters through steel strands; Step 2: Set marking points on each group of spreaders. The marking points of all spreaders are on the same horizontal line. Number each marking point in sequence and install a static level at each marking point. Step 3: Each group of hydraulic lifters of different specifications starts working and lifts the target synchronously; during the lifting process, every time the target reaches the single rated height of the hydraulic lifter, monitor whether each group of hydraulic lifters is lifted synchronously based on the measurement values ​​of the static level at each marking point.

2. The method for achieving synchronous lifting of hydraulic lifters of different specifications according to claim 1, characterized in that: In step 3, the measured value a of the static level at each marking point is i (t), take the distance d between any two marked points ij 0.005 times of is the maximum asynchronous lifting difference; For a total of n marking points, take all pairs of corresponding and non-repeating marking point combinations to form a set E = {(i, j)}; Calculate the maximum asynchronous lifting difference corresponding to each set of marking point combinations and the absolute value of the difference between the static level measurement values, and take the ratio of the absolute value of the difference between the static level measurement values ​​and the maximum asynchronous lifting difference of all marking point combinations as the evaluation value D of the set of marking point combinations. ij (t); Calculate the sum of the evaluation values ​​of all group mark point combinations A(t); If A(t)<0.75, the next rated height lifting of each group of hydraulic lifters will be carried out normally; If 0.75≤A(t)<0.9, then pay attention to the target's posture to prevent overturning and displacement, and each group of hydraulic lifters will slow down and lift; If A(t)≥0.9, stop lifting and adjust each group of hydraulic lifters.

3. The method for achieving synchronous lifting of hydraulic lifters of different specifications according to claim 2, characterized in that: If A(t)≥0.9, stop lifting and adjust each group of hydraulic lifters. The specific method is as follows: Step 4.1: Calculate the average value a of the static level measurement at each marked point i (t), locate the mark points corresponding to the maximum and minimum measurement values ​​of the static level, adjust the hydraulic lifters corresponding to the two mark points, and adjust the length of the steel strand so that the readings of the static level at the two mark points reach the average value a i (t): Step 4.2: Calculate the sum of the evaluation values ​​of all group mark point combinations A(t); if A(t)≥0.5, return to step 4.1; if A(t)<0.5, complete the adjustment of each group of hydraulic lifters and start the next rated height lift.

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