Accurate regulation and control method for arch rib installation through suspension clasp graded conversion

Abstract

The invention discloses a suspension clasp graded conversion arch rib installation accurate regulation and control method, which gives consideration to factors such as cable bent tower deviation, arch rib line shape and process error to carry out real-time graded adjustment on suspension clasp conversion. Respectively calculating the influence quantity of the unit cable force of the buckle anchor cable and the unit hoisting point force change quantity of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable bent tower, and carrying out real-time adjustment on the grading alternate conversion of the hoisting buckle in combination with the difference value between the actual measurement condition of the field arch rib and the cable bent tower and the target value in the arch rib installation process. The method has the following advantages that the factors such as cable bent tower deviation, arch rib line shape and process errors are considered, real-time grading adjustment is conducted on suspension clasp conversion, and accurate control over arch rib installation under the cable hoisting and cable-stayed buckling system coupling effect is achieved; and constructing a lifting clasp graded conversion arch rib installation accurate regulation and control calculation model, and realizing real-time adjustment of lifting clasp graded alternate conversion in the arch rib installation process by combining a difference value between an actual measurement value and a target value of an on-site arch rib and a cable bent tower.

Description

Technical Field

[0001] The invention relates to the field related to arch rib construction, and in particular to a method for accurately regulating the installation of a hanging buckle graded conversion arch rib. Background Art

[0002] At present, most of the steel tube concrete arch bridges adopt the "cable hoisting + inclined stay buckle hanging" method for cantilever assembly construction. The coupling effect of cable hoisting and inclined stay buckle hanging system will inevitably cause the arch rib installation to be difficult to accurately control during the buckle conversion process. It is necessary to take into account the factors such as the tower deviation, arch rib linear shape and process error to adjust the buckle conversion in real time. If the conventional buckle graded conversion control method is adopted, the buckle anchor cable and the hanging point force are graded tensioned and released, and the grades are the same. In fact, the increment of the buckle anchor cable force caused by the graded release conversion of the hanging point force is not equal to the conventional buckle anchor cable graded cable force. At this time, the tower deviation and arch rib linear shape are difficult to meet the target value at the same time, and the buckle anchor cable force is over-tensioned or under-tensioned, and the arch rib has a large lateral deviation, which increases the difficulty of arch rib regulation, resulting in the theoretical calculation results not being consistent with the actual construction, and burying safety hazards in the installation process of the arch rib. Summary of the invention

[0003] Therefore, in order to solve the above shortcomings, the present invention provides a method for precise control of arch rib installation by graded conversion of hooks, which takes into account factors such as cable tower deviation, arch rib linear shape and process error to adjust the hook conversion in real time. Based on the theoretical model, the influence of the unit cable force of the hook anchor and the change of the unit suspension point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower are calculated respectively. During the arch rib installation process, the graded alternating conversion of the hooks is adjusted in real time based on the difference between the actual measurement of the arch rib and the cable tower on site and the target value.

[0004] The present invention is implemented in this way, constructing a method for precise control of arch rib installation by graded conversion of hooks, which is characterized by: taking into account factors such as cable tower deviation, arch rib linear shape and process error to adjust the hook conversion in real time; starting from the theoretical model, respectively calculating the influence of the unit cable force of the hook anchor cable and the change of the unit suspension point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower, and making real-time adjustment to the graded alternating conversion of the hooks in combination with the difference between the actual measurement of the arch rib and the cable tower on site and the target value during the arch rib installation process;

[0005] According to the arch rib buckle conversion working condition, the influence vectors of unit cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are calculated in turn as {C1} and {D1}, the influence vectors of unit back cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C2} and {D2}, the influence vectors of unit hanging point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C3} and {D3}, the target values ​​of the vertical displacement of each level of the arch rib and the displacement of the cable tower in the graded conversion of the buckle are {Z1} and {X1}, respectively, the measured values ​​of the vertical displacement of the arch rib and the displacement of the cable tower before the graded conversion of the buckle are {Z2} and {X2}, respectively, the cable forces of anchor cable tensioning and hanging point release of each level of the buckle in the graded conversion of the buckle are {T1}, {T2}, {T3}, and the calculation model for precise control of arch rib installation with graded conversion of the buckle is constructed as follows:

[0006]

[0007] The lifting point force {T3} of the cable hoisting during the staged conversion of the lifting buckle is a known value. Therefore, based on the above precise control calculation model for the arch rib installation during the staged conversion of the lifting buckle, the graded cable force of the anchor cable during the staged conversion of the lifting buckle is accurately calculated, and the cable force of the anchor cable during the staged conversion of the lifting buckle is adjusted in real time, realizing the precise control of the linear shape and tower deviation during the arch rib installation process.

[0008] According to the invention, a method for precise control of the installation of hanging buckle graded conversion arch ribs is characterized in that the specific construction process is as follows:

[0009] (1) After the arch rib is hoisted into place, the temporary connection position of the arch rib is locked. Before tensioning, the original data of the tower deviation and the arch rib line shape are measured by a total station. Before tensioning, the back buckle cable is tightened by a hydraulic jack;

[0010] (2) According to the calculation model of precise control of arch rib installation with graded conversion of hooks, the linear shape of the arch rib and the deviation of the cable tower in the tightened state of the hook anchor cable were measured. When the cable hoisting system released 30% of the cable force, the cable forces of the graded tensioning of the hook anchor cable were calculated to be 28% and 35% respectively;

[0011] (3) After the tensioning is completed, the intelligent cable hoisting system is used to control the main lifting point to release 30% of the cable force, brake the cable hoisting system, and measure the arch rib linear shape and cable tower deviation at the current stage;

[0012] (4) Repeat step (2), when the cable hoisting system lifting point force releases 60% of the cable force, the cable forces of the anchor cable staged tensioning are calculated to be 55% and 63% respectively;

[0013] (5) Repeat step (3), control the main lifting point to release 60% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib linear shape and cable tower deviation at the current stage;

[0014] (6) Repeat step (3), control the main lifting point to release 100% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib linear shape and cable tower deviation at the current stage;

[0015] (7) Repeat step (2). At this time, the cable forces of the anchor cable are 100% and 100% respectively. If there is a process error, the fine adjustment amount of the cable force is calculated according to the precise control calculation model of the arch rib installation with the staged conversion of the anchor cable, so as to realize the control principle of "linear shape as the main and cable force as the auxiliary".

[0016] The present invention has the following advantages: (1) taking into account factors such as the deviation of the cable tower, the linear shape of the arch rib and the process error, the real-time graded adjustment of the conversion of the hooks is achieved, thereby realizing the precise control of the arch rib installation under the coupling effect of the cable hoisting and the inclined-stayed hook hanging system; (2) clarifying the influence of the unit cable force of the hook anchor cable and the change in the unit hanging point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower from a theoretical level, constructing a precise control calculation model for the arch rib installation of the hook graded conversion, and combining the difference between the actual measured values ​​of the arch rib and the cable tower and the target value to realize the real-time adjustment of the graded alternating conversion of the hooks during the arch rib installation process; (3) the linear control during the arch rib installation process is clear and straightforward, avoiding the theoretical calculation distortion caused by the difficulty in linear control of the arch rib caused by human factors, and timely adjustment can be made to the linear error during the arch rib installation process according to the precise control calculation model for the arch rib installation of the hook graded conversion, while solving the problem of lateral deviation of the arch rib from the perspective of "force-shape". BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of cable hoisting and inclined stay hanging system layout;

[0018] Figure 2 Schematic diagram of construction of graded alternating conversion of hanging buckles;

[0019] Figure 3 Schematic diagram of tightening the arch rib anchor cable;

[0020] Figure 4 Schematic diagram of anchor cable tensioning of the first-level conversion buckle of the hanging buckle;

[0021] Figure 5 Schematic diagram of the first-stage conversion lifting point force release of the lifting hook;

[0022] Figure 6 Schematic diagram of anchor cable tensioning of the second-level conversion buckle of the hanging buckle;

[0023] Figure 7 Schematic diagram of the second-stage conversion lifting point force release of the lifting hook;

[0024] Figure 8 Schematic diagram of the third-level conversion lifting point force release of the lifting hook;

[0025] Fig. 9 Schematic diagram of the arch rib being installed after the hook conversion is completed. DETAILED DESCRIPTION

[0026] The following will be combined with the attached Figure 1-Figure 9 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides a method for precise control of arch rib installation by graded conversion of hooks through improvement, taking into account factors such as cable tower deviation, arch rib linear shape and process error to adjust the hook conversion in real time. Based on the theoretical model, the influence of the unit cable force of the hook anchor and the change of the unit suspension point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower are calculated respectively. During the arch rib installation process, the graded alternating conversion of the hooks is adjusted in real time based on the difference between the actual measurement of the arch rib and the cable tower on site and the target value.

[0028] like Figure 2 As shown, Figure 2 Schematic diagram of construction of graded alternating conversion of hanging buckles;

[0029] According to the arch rib buckle conversion working condition, the influence vectors of unit cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are calculated in turn as {C1} and {D1}, the influence vectors of unit back cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C2} and {D2}, the influence vectors of unit hanging point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C3} and {D3}, the target values ​​of the vertical displacement of each level of the arch rib and the displacement of the cable tower in the graded conversion of the buckle are {Z1} and {X1}, respectively, the measured values ​​of the vertical displacement of the arch rib and the displacement of the cable tower before the graded conversion of the buckle are {Z2} and {X2}, respectively, the cable forces of anchor cable tensioning and hanging point release of each level of the buckle in the graded conversion of the buckle are {T1}, {T2}, {T3}, and the calculation model for precise control of arch rib installation with graded conversion of the buckle is constructed as follows:

[0030]

[0031] The lifting point force {T3} of the cable hoisting during the staged conversion of the lifting buckle is a known value. Therefore, based on the above precise control calculation model for the arch rib installation during the staged conversion of the lifting buckle, the graded cable force of the anchor cable during the staged conversion of the lifting buckle is accurately calculated, and the cable force of the anchor cable during the staged conversion of the lifting buckle is adjusted in real time, realizing the precise control of the linear shape and tower deviation during the arch rib installation process.

[0032] The specific construction process is as follows:

[0033] (1) After the arch rib is hoisted into place, the temporary connection position of the arch rib is locked. Before tensioning, the original data of the tower deviation and the arch rib line shape are measured by a total station. Before tensioning, the back buckle cable is tightened by a hydraulic jack. Figure 3 Schematic diagram of tightening the arch rib anchor cable.

[0034] (2) Based on the precise control calculation model of the arch rib installation with graded conversion of the hook, the linear shape of the arch rib and the deviation of the cable tower in the tightened state of the hook anchor cable were measured. When the cable hoisting system released 30% of the cable force, the cable forces of the graded tensioning of the hook anchor cable were calculated to be 28% and 35% respectively. Figure 4 Schematic diagram of anchor cable tensioning of the first-level conversion buckle of the suspension buckle.

[0035] (3) After the tensioning is completed, the intelligent cable hoisting system is used to control the main lifting point to release 30% of the cable force, brake the cable hoisting system, and measure the arch rib line shape and cable tower deviation at the current stage. Figure 5 Schematic diagram of the first-level conversion lifting point force release of the lifting buckle.

[0036] (4) Repeat step (2). When the cable lifting system lifting point force releases 60% of the cable force, the cable forces of the anchor cable staged tensioning are calculated to be 55% and 63% respectively. Figure 6 Schematic diagram of anchor cable tensioning for the second-stage conversion buckle of the suspension buckle.

[0037] (5) Repeat step (3), control the main lifting point to release 60% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib line shape and cable tower deviation at the current stage. Figure 7 Schematic diagram of the second-stage conversion lifting point force release of the lifting hook.

[0038] (6) Repeat step (3), control the main lifting point to release 100% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib line shape and cable tower deviation at the current stage. Figure 8 Schematic diagram of the third-level conversion lifting point force release of the lifting buckle.

[0039] (7) Repeat step (2). At this time, the cable forces of the anchor cable are 100% and 100% respectively. If there is a process error, the fine adjustment amount of the cable force is calculated according to the precise control calculation model of the arch rib installation with the staged conversion of the anchor cable, so as to realize the control principle of "linear shape as the main and cable force as the auxiliary". Fig. 9 Schematic diagram of the arch rib being installed after the hook conversion is completed.

[0040] The advantages of this application are as follows: (1) taking into account factors such as cable tower deviation, arch rib linear shape and process error, the real-time graded adjustment of the hook conversion is achieved, realizing the precise control of the arch rib installation under the coupling effect of cable hoisting and inclined-stayed hook hanging system; (2) clarifying the influence of the unit cable force of the anchor cable and the change of the unit hanging point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower from a theoretical level, constructing a precise control calculation model for the arch rib installation of the hook graded conversion, combining the difference between the actual measured value of the arch rib and the cable tower and the target value to realize the real-time adjustment of the graded alternating conversion of the hook during the arch rib installation; (3) the linear control during the arch rib installation process is clear and understandable, avoiding the theoretical calculation distortion caused by the difficulty of arch rib linear control caused by human factors, and the linear error during the arch rib installation process can be adjusted in time according to the precise control calculation model for arch rib installation of the hook graded conversion, and at the same time, the problem of lateral deviation of the arch rib is solved from the perspective of "force-shape".

[0041] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for precise control of the installation of hanging buckle graded conversion arch ribs, characterized in that; Taking into account the factors such as the deviation of the cable tower, the linear shape of the arch rib and the process error, the conversion of the suspension buckle is adjusted in real time. Based on the theoretical model, the influence of the unit cable force of the anchor cable and the change of the unit suspension point force of the cable lifting system on the vertical displacement of the arch rib and the longitudinal deviation of the cable tower is calculated respectively. During the installation of the arch rib, the difference between the actual measurement of the arch rib and the cable tower on site and the target value is combined to make real-time adjustments to the graded alternating conversion of the suspension buckle; According to the arch rib buckle conversion working condition, the influence vectors of unit cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are calculated in turn as {C1} and {D1}, the influence vectors of unit back cable force on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C2} and {D2}, the influence vectors of unit hanging point force of the cable hoisting system on the vertical displacement of the arch rib and the longitudinal displacement of the cable tower are {C3} and {D3}, the target values ​​of the vertical displacement of each level of the arch rib and the displacement of the cable tower in the graded conversion of the buckle are {Z1} and {X1}, respectively, the measured values ​​of the vertical displacement of the arch rib and the displacement of the cable tower before the graded conversion of the buckle are {Z2} and {X2}, respectively, the cable forces of anchor cable tensioning and hanging point release of each level of the buckle in the graded conversion of the buckle are {T1}, {T2}, {T3}, and the calculation model for precise control of arch rib installation with graded conversion of the buckle is constructed as follows: The lifting point force {T3} of the cable hoisting during the staged conversion of the lifting buckle is a known value. Therefore, based on the above precise control calculation model for the arch rib installation during the staged conversion of the lifting buckle, the graded cable force of the anchor cable during the staged conversion of the lifting buckle is accurately calculated, and the cable force of the anchor cable during the staged conversion of the lifting buckle is adjusted in real time, realizing the precise control of the linear shape and tower deviation during the arch rib installation process.

2. According to claim 1, a method for precise control of the installation of a hanging buckle graded conversion arch rib, characterized in that The specific construction process is as follows: (1) After the arch rib is hoisted into place, the temporary connection position of the arch rib is locked. Before tensioning, the original data of the tower deviation and the arch rib line shape are measured by a total station. Before tensioning, the back buckle cable is tightened by a hydraulic jack; (2) According to the calculation model of precise control of arch rib installation with graded conversion of hooks, the linear shape of the arch rib and the deviation of the cable tower in the tightened state of the hook anchor cable were measured. When the cable hoisting system released 30% of the cable force, the cable forces of the graded tensioning of the hook anchor cable were calculated to be 28% and 35% respectively; (3) After the tensioning is completed, the intelligent cable hoisting system is used to control the main lifting point to release 30% of the cable force, brake the cable hoisting system, and measure the arch rib linear shape and cable tower deviation at the current stage; (4) Repeat step (2), when the cable hoisting system lifting point force releases 60% of the cable force, the cable forces of the anchor cable staged tensioning are calculated to be 55% and 63% respectively; (5) Repeat step (3), control the main lifting point to release 60% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib linear shape and cable tower deviation at the current stage; (6) Repeat step (3), control the main lifting point to release 100% of the cable force through the intelligent cable lifting system, brake the cable lifting system, and measure the arch rib linear shape and cable tower deviation at the current stage; (7) Repeat step (2). At this time, the cable forces of the anchor cable are 100% and 100% respectively. If there is a process error, the fine adjustment amount of the cable force is calculated according to the precise control calculation model of the arch rib installation with the staged conversion of the anchor cable, so as to realize the control principle of "linear shape as the main and cable force as the auxiliary".

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