Construction method of sliding hanger for closure section of continuous beam across existing line

Abstract

The present invention relates to the technical field of bridge construction, and in particular to a method for constructing a sliding hanger across a continuous beam closure section of an existing line, comprising: installing a construction track above the section to be closed, mounting the hanger on the track through a suspension system, preliminarily determining the diameter and quantity of the fine-rolled steel according to the weight of the hanger, and verifying it according to the construction duration. The hanger is moved to determine its stability with the suspension system, and after the closure section is rotated and raised, the hanger is moved to the closure area for construction, and is returned and removed after completion. The present invention avoids long-term and large-scale installation and removal of hangers above existing lines through the construction of sliding hangers, reduces interference with the operation of existing lines, and reduces safety risks. Its installation, positioning and removal are simple and quick, shortening the construction period and improving efficiency. During construction, the performance of the hanger is accurately measured and controlled, and verified to ensure construction quality, reduce costs, and have good economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a sliding hanger construction method for a joint section of a continuous beam across an existing line. Background Art

[0002] In the construction of continuous beams across existing railways, highways and other transportation lines, the construction of the joint section is a key link. Since the normal operation of the existing line cannot be interrupted, traditional construction methods are often limited by factors such as site, construction space and safety risks, making it difficult to complete the construction of the joint section efficiently and safely. For example, the installation and removal of conventional hangers is complicated and may cause significant interference to the operation of the existing line, and the construction period is long and the cost is high. Therefore, a new construction method is needed to solve these problems, ensure the smooth construction of the joint section of the continuous beam across the existing line, and minimize the impact on the traffic of the existing line and the construction safety risks.

[0003] Chinese patent publication number: CN111910533A discloses a swivel beam device for spanning a composite route, a construction method and its application, comprising a swivel beam device body having a lower support platform (1), a turntable (2) and an upper support platform (5), a telescopic cylinder group arranged between the lower support platform (1) and the upper support platform (5) and used to keep the turntable (2) in a protected state, and a traction seat (93) arranged on the lower support platform (1) and used to install a power telescopic cylinder connected to the turntable (2). Through the swivel beam device, a swivel beam with a swivel angle of 88°4′0" is realized, through the telescopic cylinder group, the turntable (2) is protected in a non-working state, and through the traction seat (93), a rotation driving torque is applied to the turntable (2), thereby realizing the construction of a swivel bridge with an ultra-long span.

[0004] Traditional construction methods involve installing and removing hangers above existing lines, which often takes a long time to occupy the space above the existing lines, causing serious interference with the normal operation of the existing lines. Summary of the invention

[0005] To this end, the present invention provides a method for constructing a sliding hanger across a continuous beam joint section of an existing line, so as to overcome the problem that the traditional construction method in the prior art performs installation and removal operations of the hanger above the existing line, which often takes up the space above the existing line for a long time, causing serious interference with the normal operation of the existing line.

[0006] To achieve the above-mentioned purpose, the present invention provides a method for constructing a sliding hanger for a continuous beam closure section across an existing line, comprising:

[0007] Install the construction track above the completed section to be closed;

[0008] The hanger is installed on the construction track through the suspension system. The diameter and quantity of the fine-rolled steel of the suspension system are preliminarily determined according to the weight of the hanger and verified according to the estimated closing construction time;

[0009] Conduct a trial move of the hanger on the construction track, and determine the stability of the suspension system or hanger based on the results of the trial move;

[0010] Rotate the section to be closed and raise it, move the hanger to the area to be closed, and carry out the closing construction;

[0011] After the closing construction is completed, the hanger is moved back and dismantled and recycled;

[0012] When determining the stability of the suspension system or the hanger, obtain the speed change curve of the suspension system and the hanger during the trial movement, and determine the corresponding shaking situation by checking the speed change curve of the suspension system and the hanger. For those that cannot be determined individually, determine the stability of the suspension system or the hanger by integrating and comparing the two speed change curves.

[0013] Furthermore, determining the diameter of the fine-rolled steel of the suspension system by the weight of the hanger includes comparing the estimated total weight of the hanger with a preset standard weight value, and preliminarily selecting the diameter of the fine-rolled steel based on the comparison result.

[0014] Furthermore, after the diameter of the finished steel is determined, the quantity of the finished steel is determined by estimating the closing construction time;

[0015] When the estimated duration is less than or equal to the first standard duration, the basic finished steel quantity is selected as the finished steel quantity of the suspension system;

[0016] When the estimated duration is greater than the first standard duration, the compensating finish-rolled steel quantity is selected as the finish-rolled steel quantity of the suspension system.

[0017] Furthermore, a second displacement sensor is provided below the hanger, and a first displacement sensor is provided on the top of the suspension system;

[0018] When the trial move is carried out, the suspension system is driven to move by the winch, and the linear speed output by the winch is the basic linear speed;

[0019] Acquire a displacement variable of a first displacement sensor that changes with time, and generate a first speed change curve according to the acquired displacement variable;

[0020] A displacement variable of the second displacement sensor that changes with time is acquired, and a second speed change curve is generated according to the acquired displacement variable.

[0021] Further, the data analysis module compares the first speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the first speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively;

[0022] If the absolute value of the difference is greater than or equal to the first preset safety difference judgment value, it is determined that the first speed change curve does not meet the standard, and the installation of the suspension system is repaired;

[0023] If the absolute values ​​of the differences are all smaller than the first preset safety difference determination value, a secondary analysis is performed on the data of the first speed variation curve to determine whether the installation of the suspension system needs to be overhauled.

[0024] Further, the secondary analysis of the data of the first speed change curve includes:

[0025] Calculate the absolute value of the difference between the speed value of any point on the first speed change curve and the basic straight line speed in sequence;

[0026] The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a first deviation summary value;

[0027] The first deviation summary value is compared with the preset first deviation evaluation value, and based on the comparison result, it is determined that the suspension system is well installed, or that the installation of the suspension system needs to be overhauled, or whether installation overhaul is required is determined in combination with the analysis of the second speed change curve.

[0028] Further, the first deviation evaluation value is provided with a first preset value of the first deviation evaluation value and a second preset value of the first deviation evaluation value;

[0029] If the first deviation summary value is less than or equal to a first preset value of the first deviation evaluation value, it is determined that the suspension system is well installed;

[0030] If the first deviation summary value is greater than a first preset value of the first deviation evaluation value and less than or equal to a second preset value of the first deviation evaluation value, determining whether installation and maintenance is required by analyzing the second speed change curve;

[0031] If the first deviation summary value is greater than a second preset value of the first deviation evaluation value, it is determined that the installation of the suspension system needs to be overhauled.

[0032] Further, the data of the second speed change curve is analyzed, including:

[0033] The data analysis module compares the second speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the second speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively;

[0034] If the absolute value of the difference is greater than or equal to the second preset safety difference judgment value, it is determined that the second speed change curve does not meet the standard, and the installation of the hanger is repaired;

[0035] If the absolute values ​​of the differences are all smaller than the second preset safety difference judgment value, a secondary analysis is performed on the data of the second speed variation curve to determine whether the installation of the hanger needs to be overhauled.

[0036] Further, the secondary analysis of the data of the second speed change curve includes:

[0037] Calculate the absolute value of the difference between the speed value of any point on the second speed change curve and the basic straight line speed in sequence;

[0038] The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a second deviation summary value;

[0039] Comparing the second deviation summary value with a preset second deviation evaluation value;

[0040] If the second deviation summary value is less than or equal to the second deviation evaluation value, comprehensively analyzing the first speed change curve and the second speed change curve;

[0041] If the second deviation summary value is greater than the second deviation evaluation value, it is determined that the installation of the hanger needs to be inspected.

[0042] Further, the first speed change curve and the second speed change curve are comprehensively analyzed, including:

[0043] Sequentially calculate the difference evaluation value between the speed value of any point on the second speed change curve and the speed value on the first speed change curve at the same time point;

[0044] Select the maximum value among the calculation results and record it as the velocity deviation value at the same point;

[0045] If the same-point speed deviation value is less than or equal to the standard same-point speed deviation evaluation value, the suspension system or hanger installation will not be inspected;

[0046] If the speed deviation value at the same point is greater than the standard speed deviation evaluation value at the same point, the suspension system or the hanger installation should be inspected.

[0047] Compared with the prior art, the beneficial effect of the present invention lies in that, by adopting the sliding hanger construction, the long-term large-scale hanger installation and dismantling operations above the existing line are avoided, the interference with the normal operation of the existing line is minimized, and the construction safety risk is reduced; the installation, sliding position and dismantling process of the sliding hanger are relatively simple and quick, compared with the traditional construction method, the construction period of the joint section is greatly shortened, and the construction efficiency is improved; during the construction process, through precise measurement and control, as well as strict verification of the stability and bearing capacity of the hanger, it can ensure that the line shape and construction quality of the joint section meet the design requirements, and ensure the overall structural performance of the bridge; this construction method reduces the investment and use time of construction equipment, reduces labor costs and material waste, and at the same time reduces the economic losses caused to the operation of the existing line due to construction, and has good economic benefits.

[0048] Furthermore, the diameter of the finished steel is determined according to the weight, and the quantity of the finished steel is determined by the construction time. For construction periods that take a long time, the quantity of steel bars is increased to ensure construction safety due to fatigue time and safety considerations.

[0049] Furthermore, by collecting the speed change curves of the suspension system and the hanger, the degree of shaking of the suspension system and the hanger during movement can be evaluated, and by evaluating the degree of shaking, the compactness of the connection between the components can be reflected, thereby reflecting the safety of the connection between the components. At the same time, by setting the displacement sensor of the hanger at the bottom, the value of the shaking data can be expanded, making the analysis results more accurate.

[0050] Furthermore, when performing data analysis, the suspension system is first analyzed to determine whether the installation is stable from the source. At the same time, the shaking of the displacement sensor point on the suspension system can be reflected by calculating the speed difference. When the absolute value of the calculated difference is large, it means that the speed of the displacement sensor is different from the standard speed, and the speed of the point in contact with the traction device on the suspension system is consistent with the linear speed output by the traction device. Therefore, it can be known that when the speed difference between the displacement sensor and the standard speed is large, there is a distance difference between the corresponding point of the displacement sensor and the point in contact with the traction device, and the suspension system will shake. Therefore, the distance difference is evaluated by the speed difference. For those with good connections, under the influence of external factors, although the speed of the displacement sensor point on the suspension system will fluctuate to a certain extent, the fluctuation is predictable. By determining whether the suspension system shakes due to connection problems by the speed difference between the displacement point and the standard speed, the safety of construction is guaranteed.

[0051] Furthermore, by performing a secondary analysis on the data of the first speed change curve, a comprehensive judgment can be made on the connection stability of the suspension system through the shaking frequency and the absolute value of the speed difference. This is because the shaking difference may be small but the frequency is high, which also poses a certain risk. The first deviation summary value between the first preset value and the second preset value of the first deviation evaluation value indicates that there is a certain shaking. Other test results can be used to verify whether it needs maintenance, and comprehensive considerations can be made to ensure the safety of construction.

[0052] Furthermore, by calculating the speed difference, the shaking of the displacement sensor point on the hanger can be reflected. When the absolute value of the calculated difference is large, it means that the speed of the displacement sensor is significantly different from the standard speed, while the speed of the point in contact with the traction device on the suspension system is consistent with the linear speed output by the traction device. Therefore, it can be known that when the speed of the displacement sensor is significantly different from the standard speed, there is a distance difference between the corresponding point of the displacement sensor and the point in contact with the traction device, and the hanger will shake. At the same time, the shaking of the hanger may be the combined effect of the unstable connection of the hanger itself and the unstable connection of the suspension system. Therefore, after the suspension system meets the basic connection relationship, the shaking data of the hanger is analyzed, and the difference between the speed of the displacement point and the standard speed is used to determine whether the hanger shakes due to a connection problem, thereby ensuring the safety of construction.

[0053] Furthermore, by performing a secondary analysis on the data of the second speed change curve, the connection stability of the suspension system can be comprehensively judged through the shaking frequency and the absolute value of the speed difference. This is because it is possible that the shaking difference is small but the frequency is high, which also poses a certain risk. Comprehensive considerations are required to ensure the safety of the construction.

[0054] Furthermore, by directly comparing the first speed change curve with the second speed change curve, the stability of the connection between the suspension system and the hanger can be more intuitively reflected, so that it can be determined whether to carry out maintenance, thereby further ensuring construction safety.

[0055] Furthermore, for suspension systems with larger shaking, the risk level is greater. By reducing the numerical value of the standard same-point velocity deviation evaluation value, the verification data can be adjusted to ensure the rationality of the judgment and further ensure construction safety.

[0056] Furthermore, when the sum of the second deviation summary value and the first deviation summary value is larger, it means that the shaking during the movement process is greater. Therefore, by reducing the moving speed and reducing the shaking during the movement, construction safety is further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a flow chart of the sliding hanger construction method of the closure section of the continuous beam across the existing line in the embodiment;

[0058] Figure 2 A flow chart for determining the diameter and quantity of the finished rolled steel of the suspension system in an embodiment;

[0059] Figure 3 is an analysis flow chart of the first speed change curve in the embodiment;

[0060] Figure 4 is an analysis flow chart of the second speed change curve in the embodiment;

[0061] Figure 5 A flow chart for comprehensive analysis of the first speed change curve and the second speed change curve. DETAILED DESCRIPTION

[0062] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0063] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0064] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0065] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] See also Figure 1 As shown, Figure 1 It is a flow chart of the sliding hanger construction method of the closure section of the continuous beam across the existing line in the embodiment;

[0067] The present invention provides a method for constructing a sliding hanger for a joint section of a continuous beam across an existing line, comprising:

[0068] S1, installing the construction track, installing the construction track above the completed section to be closed;

[0069] S2, installing the hanger on the construction track through the suspension system, the diameter and quantity of the fine-rolled steel of the suspension system are preliminarily determined according to the weight of the hanger, and are checked according to the estimated closing construction time;

[0070] S3, test moving the hanger on the construction track, and determining the stability of the suspension system based on the test movement results;

[0071] S4, rotating and raising the section to be closed, moving the hanger to the area to be closed, and performing closing construction;

[0072] S5, after the closing construction is completed, the hanger is moved back and dismantled and recycled.

[0073] By adopting the sliding hanger construction, the long-term large-scale hanger installation and removal operations above the existing line are avoided, the interference with the normal operation of the existing line is minimized, and the construction safety risks are reduced; the installation, sliding position and removal process of the sliding hanger are relatively simple and quick. Compared with the traditional construction method, it greatly shortens the construction period of the joint section and improves the construction efficiency; during the construction process, through precise measurement and control, as well as strict verification of the stability and bearing capacity of the hanger, it can ensure that the line shape and construction quality of the joint section meet the design requirements, and ensure the overall structural performance of the bridge; this construction method reduces the investment and use time of construction equipment, reduces labor costs and material waste, and at the same time reduces the economic losses caused by construction to the operation of the existing line, and has good economic benefits.

[0074] See also Figure 2 As shown, Figure 2 A flow chart for determining the diameter and quantity of the finished rolled steel of the suspension system in an embodiment;

[0075] Specifically, determining the diameter of the fine-rolled steel of the suspension system by the weight of the hanger includes comparing the estimated total weight of the hanger with a preset standard weight value, and preliminarily selecting the diameter of the fine-rolled steel based on the comparison result.

[0076] If the estimated total weight of the hanger is less than or equal to the first preset standard weight value, selecting the first diameter of the finely rolled steel as the finely rolled steel of the suspension system;

[0077] If the estimated total weight of the hanger is greater than the first preset standard weight value and less than or equal to the second preset standard weight value, then selecting the second diameter of the finely rolled steel as the finely rolled steel of the suspension system;

[0078] If the estimated total weight of the hanger is greater than the second preset standard weight value, the third diameter of the finely rolled steel is selected as the finely rolled steel for the suspension system.

[0079] In this embodiment, the first preset standard weight value is 15 tons, the second preset standard weight value is 30 tons, the first diameter is 18 mm, the second diameter is 25 mm, and the third diameter is 32 mm.

[0080] Specifically, after the diameter of the finished steel is determined, the quantity of the finished steel is determined by estimating the closing construction time;

[0081] When the estimated duration is less than or equal to the first standard duration, the basic finished steel quantity is selected as the finished steel quantity of the suspension system;

[0082] When the estimated duration is greater than the first standard duration, the compensating finish-rolled steel quantity is selected as the finish-rolled steel quantity of the suspension system.

[0083] The diameter of the finished steel is determined according to the weight, and the quantity of the finished steel is determined according to the construction time. For longer construction times, the quantity of steel bars is increased to ensure the safety of the construction due to the fatigue time and safety considerations of the steel bars.

[0084] In this embodiment, the first standard time is 6 hours, the amount of basic finished rolled steel is 4, and the amount of compensation finished rolled steel is 6.

[0085] Specifically, a second displacement sensor is arranged below the hanger, and a first displacement sensor is arranged on the top of the suspension system.

[0086] When conducting a trial move, the suspension system is moved by the winch, and the linear speed output by the winch is the basic linear speed.

[0087] Acquire a displacement variable of a first displacement sensor that changes with time, and generate a first speed change curve according to the acquired displacement variable;

[0088] A displacement variable of the second displacement sensor that changes with time is acquired, and a second speed change curve is generated according to the acquired displacement variable.

[0089] The data analysis module analyzes the first speed change curve and the second speed change curve to determine whether the current hoisting is stable.

[0090] By collecting the speed change curves of the suspension system and the hanger, the degree of shaking of the suspension system and the hanger during movement can be evaluated. By evaluating the degree of shaking, the compactness of the connection between the components can be reflected, thereby reflecting the safety of the connection between the components. At the same time, by setting the displacement sensor of the hanger at the bottom, the value of the shaking data can be expanded, making the analysis results more accurate.

[0091] See also Figure 3 As shown, Figure 3 is an analysis flow chart of the first speed change curve in the embodiment;

[0092] Specifically, the data analysis module compares the first speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the first speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively;

[0093] If the absolute value of the difference is greater than or equal to the first preset safety difference judgment value, it is determined that the first speed change curve does not meet the standard, and the installation of the suspension system is repaired;

[0094] If the absolute values ​​of the differences are all smaller than the first preset safety difference determination value, a secondary analysis is performed on the data of the first speed variation curve to determine whether the installation of the suspension system needs to be overhauled.

[0095] When analyzing data, the suspension system is analyzed first, which can determine whether the installation is stable from the source. At the same time, the shaking of the displacement sensor point on the suspension system can be reflected by calculating the speed difference. When the absolute value of the calculated difference is large, it means that the speed of the displacement sensor is different from the standard speed, and the speed of the point in contact with the traction device on the suspension system is consistent with the linear speed output by the traction device. Therefore, it can be known that when the speed difference between the displacement sensor and the standard speed is large, there is a distance difference between the corresponding point of the displacement sensor and the point in contact with the traction device, and the suspension system will shake. Therefore, the distance difference is evaluated by the speed difference. For those with good connections, under the influence of external factors, although the speed of the displacement sensor point on the suspension system will fluctuate to a certain extent, the fluctuation is predictable. By determining whether the suspension system shakes due to connection problems by the speed difference between the displacement point and the standard speed, the safety of construction is guaranteed.

[0096] Specifically, the secondary analysis of the data of the first speed change curve includes:

[0097] Calculate the absolute value of the difference between the speed value of any point on the first speed change curve and the basic straight line speed in sequence;

[0098] The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a first deviation summary value;

[0099] Comparing the first deviation summary value with a preset first deviation evaluation value;

[0100] If the first deviation summary value is less than or equal to a first preset value of the first deviation evaluation value, it is determined that the suspension system is well installed;

[0101] If the first deviation summary value is greater than a first preset value of the first deviation evaluation value and less than or equal to a second preset value of the first deviation evaluation value, determining whether installation and maintenance is required by analyzing the second speed change curve;

[0102] If the first deviation summary value is greater than a second preset value of the first deviation evaluation value, it is determined that the installation of the suspension system needs to be overhauled.

[0103] Through secondary analysis of the data of the first speed change curve, the connection stability of the suspension system can be comprehensively judged through the shaking frequency and the absolute value of the speed difference. Because the shaking difference may be small but the frequency is high, this situation also poses certain risks. The first deviation summary value between the first preset value and the second preset value of the first deviation evaluation value indicates that there is a certain shaking. The need for maintenance can be verified through other test results, and comprehensive considerations can be made to ensure the safety of construction.

[0104] See also Figure 4 As shown, Figure 4 is an analysis flow chart of the second speed change curve in the embodiment;

[0105] Specifically, after determining that the first deviation summary value is less than or equal to the second preset value of the first deviation evaluation value, analyzing the data of the second speed change curve includes:

[0106] The data analysis module compares the second speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the second speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively;

[0107] If the absolute value of the difference is greater than or equal to the second preset safety difference judgment value, it is determined that the second speed change curve does not meet the standard, and the installation of the hanger is repaired;

[0108] If the absolute values ​​of the differences are all smaller than the second preset safety difference judgment value, a secondary analysis is performed on the data of the second speed variation curve to determine whether the installation of the hanger needs to be overhauled.

[0109] By calculating the speed difference, the shaking of the displacement sensor point on the hanger can be reflected. When the absolute value of the calculated difference is large, it means that the speed of the displacement sensor is significantly different from the standard speed, while the speed of the point in contact with the traction device on the suspension system is consistent with the linear speed output by the traction device. Therefore, it can be known that when the speed of the displacement sensor is significantly different from the standard speed, there is a distance difference between the corresponding point of the displacement sensor and the point in contact with the traction device, and the hanger will shake. At the same time, the shaking of the hanger may be the combined effect of the unstable connection of the hanger itself and the unstable connection of the suspension system. Therefore, after the suspension system meets the basic connection relationship, the shaking data of the hanger is analyzed. By measuring the speed difference between the displacement point and the standard speed, it is determined whether the hanger shakes due to a connection problem, thereby ensuring the safety of the construction.

[0110] Specifically, the secondary analysis of the data of the second speed change curve includes:

[0111] Calculate the absolute value of the difference between the speed value of any point on the second speed change curve and the basic straight line speed in sequence;

[0112] The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a second deviation summary value;

[0113] Comparing the second deviation summary value with a preset second deviation evaluation value;

[0114] If the second deviation summary value is less than or equal to the second deviation evaluation value, comprehensively analyzing the first speed change curve and the second speed change curve;

[0115] If the second deviation summary value is greater than the second deviation evaluation value, it is determined that the installation of the hanger needs to be inspected.

[0116] Through secondary analysis of the data of the second speed change curve, the connection stability of the suspension system can be comprehensively judged through the shaking frequency and the absolute value of the speed difference. Because the shaking difference may be small but the frequency is high, this situation also poses a certain risk. Comprehensive considerations are required to ensure the safety of construction.

[0117] See also Figure 5 As shown, Figure 5 A flow chart for comprehensively analyzing the first speed change curve and the second speed change curve;

[0118] Specifically, the first speed change curve and the second speed change curve are comprehensively analyzed, including:

[0119] Sequentially calculate the difference evaluation value between the speed value of any point on the second speed change curve and the speed value on the first speed change curve at the same time point;

[0120] Select the maximum value among the calculation results and record it as the velocity deviation value at the same point;

[0121] If the same-point speed deviation value is less than or equal to the standard same-point speed deviation evaluation value, the suspension system or hanger installation will not be inspected;

[0122] If the same-point speed deviation value is greater than the standard same-point speed deviation evaluation value, the suspension system or the hanger installation is inspected. If the previous sequence determines that the suspension system does not need to be inspected, only the installation of the frame is inspected.

[0123] By directly comparing the first speed change curve with the second speed change curve, the stability of the connection between the suspension system and the hanger can be more intuitively reflected, so that it can be determined whether to carry out maintenance, thereby further ensuring construction safety.

[0124] Specifically, the value of the standard same-point speed deviation evaluation value is determined by the first deviation summary value. When the first deviation summary value is greater than the first preset value of the first deviation evaluation value, the set standard same-point speed deviation evaluation value is smaller. When the first deviation summary value is less than or equal to the first preset value of the first deviation evaluation value, the set standard same-point speed deviation evaluation value is larger.

[0125] For suspension systems with larger shaking, the risk level is greater. By reducing the value of the standard same-point velocity deviation evaluation value, the verification data can be adjusted to ensure the rationality of the judgment and further ensure construction safety.

[0126] Specifically, for the hanger and suspension system that have passed the trial movement verification, during the actual closing movement, the actual movement speed is affected by the sum of the second deviation summary value and the first deviation summary value. The larger the sum, the slower the movement speed.

[0127] Specifically, the larger the sum of the second deviation summary value and the first deviation summary value is, the greater the shaking during the movement. Therefore, by reducing the moving speed and reducing the shaking during the movement, construction safety is further guaranteed.

[0128] As an example of a set of actual installations, the track system uses 1.5m long double-jointed 45 I-beams as sleepers, with a spacing of 3m. 32 fine-rolled steel is reserved for anchoring the sleepers and beams. The track is welded with 25 channel steel and sleepers. The double-jointed Bailey beam and the upper crossbeam of the hanger system are welded as a whole for sliding. The double-jointed Bailey frame is equipped with 4 flower windows, one at the end and the Bailey frame connection position. The sliding power uses two 5t winches to pull the hanger system to slide.

[0129] The hanger system uses φ32 finely rolled threaded steel bars arranged 80cm from the end of the upper beam. The upper (lower) beams use 15m long double-jointed 45 I-beams, which are connected by 10mm stiffening steel plates. The center spacing of the beams is 3m, of which the double-jointed 45 I-beams of the upper beam are directly butt-welded, and 40 I-beams are used for welding between beams.

[0130] φ32 finely rolled threaded steel hangers are installed 80cm away from the upper and lower beams as the sliding and lifting and lowering hanger system (the bottom adopts the lifting lug method), and 4 10t fall chains cooperate with the lifting of the hanger. φ32 finely rolled threaded steel hangers are installed 50cm away from the outside of the web to bear the weight of the concrete pouring and steel bars on the web side. After sliding into place, φ32 finely rolled threaded steel hangers are installed at a distance of 150cm from the bottom plate to limit and bear the weight of the hanger system. When the bottom plate finely rolled threaded steel is connected, the tightening mark should be made in advance with white paint to ensure that the upper and lower finely rolled steels are centered.

[0131] The sides and ends of the protection system are enclosed with double-sided color steel sandwich panels. Vertical 8*8 square steel and horizontal 4*6 are installed on the outside of the rock wool board as the frame of the rock wool board. 8*8 square steel scissor braces are installed on the inside to sandwich the rock wool board in the middle. The square steel connection adopts full welding (that is, the horizontal square steel is cut to contact the vertical overlapping part, and the cut section is fully welded on the vertical 8*8 square steel). The rock wool board is fixed on the square steel frame and scissor brace with self-tapping screws. The square steel frame is welded to the scissor brace and the steel pipe bracket under the flange plate as a whole, and the steel pipe layout rules are the same as the frame.

[0132] The sliding track is made of 25 channel steel with polytetrafluoroethylene plates laid inside. The hanger slides using two 5t winches to pull the Bailey beam to slide on the 25 channel steel track. Before sliding, an I14 I-beam is welded in the middle of the Bailey frame end as the winch traction point, and marked on the track to try to achieve synchronous sliding on both sides.

[0133] After the rotation is completed, the hanger is installed at the last standard segment position, and a winch is installed on the cantilever section in the direction of block 0 to pull the Bailey beam to the joint section position for joint section construction. The winch wire rope is sent from the opposite segment to the hanger using a slide bar and fixed on the I14 I-beam traction point. During the sliding process, a dedicated person is assigned to monitor in real time whether the forward travel of the tracks on both sides is consistent. If the travel deviation is greater than 5cm, the sliding should be stopped immediately.

[0134] The winch is controlled by jogging to adjust the track. After the construction of the middle span closure section is completed, the hanger is lowered 3.5m, and a winch is installed on the No. 0 block of pier 638 to slide the hanger of the closure section to the No. 0 section.

[0135] Before the hanger slides, the reserved holes in the bottom plate and the reserved holes in the web plate are used to limit the position of the last segment; after the sliding is completed, the hanger system is limited by the reserved holes in the top plate and the bottom plate of the two T-structure ends.

[0136] After the hanger is slid into place and anchored, the construction method is the same as that of the ordinary hanging basket joint section.

[0137] The construction of the bridge deck system in the closure section has been completed, the hole plugging has been completed, and the hanger has been lowered 3.5m. The hanger uses 4 32 fine-rolled steel and 4 10t fall chains outside the beam body to connect the lower beam. The Bailey beam is pulled by a winch to slide to Block 0. The hanger is hoisted to the ground at Block 0 using two 100t cranes, and the lower beam and protection system are disassembled on the ground. The upper beam, Bailey beam and track are hoisted in sequence.

[0138] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0139] 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 constructing a sliding hanger for a continuous beam closure section across an existing line, characterized in that: include, Install the construction track above the completed section to be closed; The hanger is installed on the construction track through the suspension system. The diameter and quantity of the fine-rolled steel of the suspension system are preliminarily determined according to the weight of the hanger and verified according to the estimated closing construction time; Conduct a trial move of the hanger on the construction track, and determine the stability of the suspension system or hanger based on the results of the trial move; Rotate the section to be closed and raise it, move the hanger to the area to be closed, and carry out the closing construction; After the closing construction is completed, the hanger is moved back and dismantled and recycled; When determining the stability of the suspension system or the hanger, obtain the speed change curves of the suspension system and the hanger during the trial movement, and determine the corresponding shaking conditions by verifying the speed change curves of the suspension system and the hanger. If the shaking conditions cannot be determined separately, determine the stability of the suspension system or the hanger by integrating and comparing the two speed change curves. A second displacement sensor is arranged below the hanger, and a first displacement sensor is arranged on the top of the suspension system; When the trial move is carried out, the suspension system is driven to move by the winch, and the linear speed output by the winch is the basic linear speed; Acquire a displacement variable of a first displacement sensor that changes with time, and generate a first speed change curve according to the acquired displacement variable; Acquire a displacement variable of a second displacement sensor that changes with time, and generate a second speed change curve according to the acquired displacement variable; The data analysis module compares the first speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the first speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively; If the absolute value of the difference is greater than or equal to the first preset safety difference judgment value, it is determined that the first speed change curve does not meet the standard, and the installation of the suspension system is repaired; If the absolute values ​​of the differences are all smaller than the first preset safety difference determination value, a secondary analysis is performed on the data of the first speed variation curve to determine whether the installation of the suspension system needs to be overhauled.

2. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 1 is characterized in that: Determining the diameter of the fine-rolled steel of the suspension system by the weight of the hanger includes comparing the estimated total weight of the hanger with a preset standard weight value, and preliminarily selecting the diameter of the fine-rolled steel based on the comparison result.

3. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 2 is characterized in that: After the diameter of the finished steel is determined, the quantity of the finished steel is determined by estimating the closing construction time; When the estimated duration is less than or equal to the first standard duration, the basic finished steel quantity is selected as the finished steel quantity of the suspension system; When the estimated duration is greater than the first standard duration, the compensating finish-rolled steel quantity is selected as the finish-rolled steel quantity of the suspension system.

4. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 1 is characterized in that: The secondary analysis of the data of the first speed change curve includes: Calculate the absolute value of the difference between the speed value of any point on the first speed change curve and the basic straight line speed in sequence; The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a first deviation summary value; The first deviation summary value is compared with the preset first deviation evaluation value, and based on the comparison result, it is determined that the suspension system is well installed, or that the installation of the suspension system needs to be overhauled, or whether installation overhaul is required is determined in combination with the analysis of the second speed change curve.

5. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 4 is characterized in that: The first deviation evaluation value is provided with a first preset value of the first deviation evaluation value and a second preset value of the first deviation evaluation value; If the first deviation summary value is less than or equal to a first preset value of the first deviation evaluation value, it is determined that the suspension system is well installed; If the first deviation summary value is greater than a first preset value of the first deviation evaluation value and less than or equal to a second preset value of the first deviation evaluation value, determining whether installation and maintenance is required by analyzing the second speed change curve; If the first deviation summary value is greater than a second preset value of the first deviation evaluation value, it is determined that the installation of the suspension system needs to be overhauled.

6. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 1 is characterized in that: Analyze the data of the second speed change curve, including: The data analysis module compares the second speed change curve with the basic linear speed, obtains the maximum speed and the minimum speed on the second speed change curve, and calculates the absolute value of the difference with the basic linear speed respectively; If the absolute value of the difference is greater than or equal to the second preset safety difference judgment value, it is determined that the second speed change curve does not meet the standard, and the installation of the hanger is repaired; If the absolute values ​​of the differences are all smaller than the second preset safety difference judgment value, a secondary analysis is performed on the data of the second speed variation curve to determine whether the installation of the hanger needs to be overhauled.

7. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 6 is characterized in that: The secondary analysis of the data of the second speed change curve includes: Calculate the absolute value of the difference between the speed value of any point on the second speed change curve and the basic straight line speed in sequence; The sum of the absolute values ​​of the differences between all points on the first speed change curve and the basic straight line speed is calculated by integration, and recorded as a second deviation summary value; Comparing the second deviation summary value with a preset second deviation evaluation value; If the second deviation summary value is less than or equal to the second deviation evaluation value, comprehensively analyzing the first speed change curve and the second speed change curve; If the second deviation summary value is greater than the second deviation evaluation value, it is determined that the installation of the hanger needs to be inspected.

8. The method for constructing a sliding hanger for a continuous beam closure section across an existing line according to claim 7 is characterized in that: Comprehensively analyzing the first speed change curve and the second speed change curve, including: Sequentially calculate the difference evaluation value between the speed value of any point on the second speed change curve and the speed value on the first speed change curve at the same time point; Select the maximum value among the calculation results and record it as the velocity deviation value at the same point; If the same-point speed deviation value is less than or equal to the standard same-point speed deviation evaluation value, the suspension system or hanger installation will not be inspected; If the speed deviation value at the same point is greater than the standard speed deviation evaluation value at the same point, the suspension system or the hanger installation should be inspected.

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