A control method for temporary sliding displacement of steel box girder

Abstract

The present invention relates to a method for controlling the temporary sliding displacement of a steel box girder, comprising the following steps: determining the maximum force value of the sliding direction of the steel box girder and a preset displacement point; arranging a sliding control device between the pylon and the steel box girder for controlling the sliding displacement of the steel box girder from exceeding the theoretically designed value; by arranging the sliding control device between the pylon and the steel box girder, compared with the displacement control that may occur during the construction of traditional bridges, it avoids the varying degrees of damage and injury to the moving structure and the limiting structure caused by rigid control, and takes into account the controllability of the preset displacement amount of the steel box girder, which not only satisfies the free telescopic sliding within the preset displacement range of the beam body itself, but also ensures that it does not undergo over-limit and excessive displacement caused by external forces; meanwhile, this control method has the advantages of high control accuracy, high control efficiency, and flexible adjustability, ensuring the controllability of the construction quality of the entire cycle of the stay cable stage, and being safe and efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a method for controlling the temporary sliding displacement of a steel box girder. Background Art

[0002] Currently, in the field of bridge engineering construction, many bridge structures currently adopt the cable-stayed steel box girder structure. The greatest advantage of this type of bridge structure is that it can meet special construction requirements such as large spans, complex terrains, and high environmental protection requirements. In order to further meet the requirements of construction design, reduce construction costs, and improve the service function of the bridge, etc., the bridge also needs to carry out integrated design and adjustment of the bridge structure, alignment, shape, etc. according to the actual construction terrain and geomorphology or the natural environment where the bridge site is located, that is, to ensure that the appearance designs such as the structural design, shape design, and alignment design of the bridge are coordinated and harmonious with the surrounding environment and the bridge operation environment; this has led to the emergence of cable-stayed structures with various structural shapes and complex and changeable bridge alignments; the emergence of such situations has, on the one hand, broken the traditional thinking that the design of cable structure bridges is usually a straight structure, and on the other hand, the complex and changeable shape and alignment have caused various theoretical verification and theoretical support situations to occur at different stages of bridge construction.

[0003] For example, in the third bid section of the connecting line project from Chaijiaxia Bridge to Port Area Bridge in Xigu, Lanzhou, the bridge structure of this project is a cable-stayed steel box girder semi-floating system structure. At the same time, restricted by the surrounding environment and special geographical location, the main steel box girder structure of this bridge forms an "S" structure with a curvature radius of 600m + a curvature radius of 1020m on the plane curve; this has formed a spatial fan-shaped structure for the distribution and arrangement of the stay cables, and the stay cable system presents an arc-shaped radial pattern on the projection plane.

[0004] During the construction stage of the stay cables, affected by special technological processes, when the stay cables are tensioned and installed, due to uncertain factors such as force systems, variable loads during the construction stage, environment, and temperature, the steel box girder structure will undergo a sliding displacement exceeding the theoretical design value, resulting in damage to the bridge structure. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for controlling the temporary sliding displacement of a steel box girder, and its advantage is that it can solve the problem of the sliding displacement of the steel box girder structure exceeding the theoretical design value and avoid damage to the bridge structure.

[0006] The above invention purpose of the present invention is achieved through the following technical solutions: A method for controlling the temporary sliding displacement of a steel box girder includes the following steps:

[0007] Determine the maximum force value between the sliding direction of the steel box girder and the preset displacement point;

[0008] A sliding control device is provided between the tower column and the steel box girder to control the sliding displacement of the steel box girder from exceeding the theoretical design value.

[0009] Preferably, for the method for controlling the temporary sliding displacement of the steel box girder provided by the present invention, the determination of the maximum force value of the sliding direction of the steel box girder and the preset displacement point includes:

[0010] A scale is provided on the side of the tower column facing the steel box girder. One end of the scale is fixedly connected to the tower column, and the other end of the scale is placed on the top plate of the steel box girder.

[0011] At different time periods, the displacement of the steel box girder at different preset time nodes is recorded through the scale until the displacement changes regularly and stably, and the final displacement position of the steel box girder at the maximum displacement is recorded.

[0012] The sliding direction of the steel box girder is confirmed through on-site observation to determine the sliding trajectory of the steel box girder.

[0013] A pressure sensor is provided between the tower column and the steel box girder to detect the maximum force value of the preset displacement point of the steel box girder.

[0014] After the detection of the maximum force value of the preset displacement point of the steel box girder is completed, the pressure sensor is removed.

[0015] Preferably, for the method for controlling the temporary sliding displacement of the steel box girder provided by the present invention, before determining the sliding direction of the steel box girder and the maximum force value of the preset displacement point, it further includes: setting a sliding limit stress component on the side of the tower column facing the steel box girder.

[0016] Preferably, for the method for controlling the temporary sliding displacement of the steel box girder provided by the present invention, the setting of a sliding control device between the tower column and the steel box girder to control the sliding displacement of the steel box girder from exceeding the theoretical design value includes:

[0017] Manufacturing the sliding control device according to the maximum force value of the preset displacement point monitored by the pressure sensor;

[0018] Setting the sliding control device between the sliding limit stress component and the steel box girder.

[0019] Preferably, for the method for controlling the temporary sliding displacement of the steel box girder provided by the present invention, the sliding control device includes a base and a stress component. The stress component is arranged on one side of the base, and the stress component is adjustably connected to the base; the stress component is used to control the sliding displacement of the steel box girder not to exceed the theoretical design value; the base is used to buffer the sliding of the steel box girder.

[0020] Preferably, in the control method for temporary sliding displacement of a steel box girder provided by the present invention, the force-bearing component includes a first adjusting unit and a second adjusting unit, one end of the first adjusting unit is adjustably connected to the base, and the other end of the first adjusting unit is connected to the second adjusting unit; the first adjusting unit is used to adjust the height of the sliding control device to mitigate the rapid displacement of the steel box girder; the second adjusting unit is used to withstand the pressure generated when the steel box girder is displaced.

[0021] Preferably, in the control method for temporary sliding displacement of a steel box girder provided by the present invention, the first adjusting unit includes a box body and a jack, the box body is enclosed to form a accommodating cavity, the jack is accommodated in the accommodating cavity, the box body is adjustably connected to the base through an anti-slip bolt, the box body can slide relative to the anti-slip bolt to adjust a preset distance between the box body and the base; the bottom end of the jack abuts against the base, and the top end of the jack is inserted in the second adjusting unit.

[0022] Preferably, in the control method for temporary sliding displacement of a steel box girder provided by the present invention, the second adjusting unit includes a roller box and a roller unit, the roller box is surrounded by a accommodating cavity, the roller unit is partially inserted in the accommodating cavity, and the roller unit can slide relative to the roller box; a limiting ring is provided at the bottom end of the roller box, and the limiting ring is used to be mounted on one end of the first adjusting unit.

[0023] Preferably, in the control method for temporary sliding displacement of a steel box girder provided by the present invention, the roller unit includes a connecting frame and a plurality of rollers, the connecting frame is enclosed to form an installation space, the plurality of rollers are all arranged in the installation space, the plurality of rollers are arranged at intervals along the extension direction of the connecting frame, and the plurality of rollers are all capable of rotating relative to the connecting frame.

[0024] Preferably, in the method for controlling temporary sliding displacement of a steel box girder provided by the present invention, the base comprises a mounting plate and a buffer block, and the buffer block is arranged on one side of the mounting plate.

[0025] Preferably, in the method for controlling the temporary sliding displacement of a steel box girder provided by the present invention, the sliding limit force-bearing component includes a fixed block and a friction force-bearing plate, the friction force-bearing plate is connected to one end of the fixed block, and the end of the fixed block facing away from the friction force plate is connected to the side wall of the tower column.

[0026] In summary, the beneficial technical effects of the present invention are as follows: The method for controlling the temporary sliding displacement of the steel box girder provided in this application includes the following steps: determining the maximum force value between the sliding direction of the steel box girder and the preset displacement point; setting a sliding control device between the tower column and the steel box girder to control the sliding displacement of the steel box girder from exceeding the theoretical design value; by setting a sliding control device between the tower column and the steel box girder, compared with the displacement control that may occur during traditional bridge construction, thus avoiding varying degrees of damage and injury to the moving structure and the limiting structure caused by rigid control. At the same time, this control method also takes into account ensuring that the technical parameters and theoretical data designed in the construction process do not undergo essential changes, and controllably considers the preset displacement amount of the steel box girder. It not only satisfies the free telescopic sliding within the preset displacement range of the beam body itself but also ensures that it does not undergo over-limit and excessive displacement caused by external forces; solves the problem of the sliding displacement of the steel box girder structure exceeding the theoretical design value and avoids damage to the bridge structure; at the same time, this control method has the advantages of high control accuracy, high control efficiency, and flexible adjustability, ensuring the controllability of the entire construction quality, safety, and high efficiency during the cable-stayed cable stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flowchart of the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention.

[0028] Figure 2 is a schematic connection structure diagram of the tower column, the sliding limit force-bearing component, the sliding control device, and the steel box girder in the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention Figure 1 .

[0029] Figure 3 is a schematic connection structure diagram of the tower column, the sliding limit force-bearing component, the sliding control device, and the steel box girder in the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention Figure 2 .

[0030] Figure 4 is a schematic overall structure diagram of the sliding control device in the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention Figure 1 .

[0031] Figure 5 is a schematic overall structure diagram of the sliding control device in the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention Figure 2 .

[0032] Figure 6 is a schematic overall structure diagram of the sliding control device in the method for controlling the temporary sliding displacement of the steel box girder provided by an embodiment of the present invention Figure 3 .

[0033] Figure 7It is a schematic diagram of the overall structure of the sliding control device in the method for controlling the temporary sliding displacement of the steel box girder provided by the embodiment of the present invention. Figure 4 .

[0034] Figure 8 It is an exploded view of the sliding control device in the method for controlling the temporary sliding displacement of the steel box girder provided by the embodiment of the present invention.

[0035] In the figure, 1 is the sliding control device; 10 is the base; 11 is the mounting plate; 12 is the buffer block; 20 is the force-bearing assembly; 21 is the first adjustment unit; 211 is the box body; 2111 is the convex platform; 212 is the jack; 213 is the anti-detachment mother and son bolt; 2131 is the sliding rod; 2132 is the sleeve; 2133 is the anti-detachment limit plate; 22 is the second adjustment unit; 221 is the roller box; 2211 is the limit ring; 2212 is the sliding groove; 222 is the roller unit; 2221 is the connecting frame; 2222 is the roller; 2223 is the connecting rod; 2 is the sliding limit force-bearing assembly; 201 is the fixed block; 202 is the friction force-bearing plate; 3 is the tower column; 4 is the steel box girder; 5 is the scale. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Referring to Figure 1 , a method for controlling the temporary sliding displacement of a steel box girder 4 disclosed in the present invention includes the following steps:

[0038] S101. Determine the maximum force value of the sliding direction of the steel box girder 4 and the preset displacement point.

[0039] Specifically, the steel box girder 4 slides relative to the tower column 3 and the expansion joint. That is to say, different from the tower column 3 and the expansion joint being stationary relative to the steel box girder 4, the sliding direction and displacement amount of the steel box girder 4 are judged with the tower column 3 and the expansion joint as the reference objects.

[0040] Taking Figure 2 the shown orientation as an example, the expansion joint is located at the front and rear positions of the steel box girder 4.

[0041] Among them, continuing to refer to Figure 2 , the steel box girder 4 slides both in the X direction and in the Y direction. It should be noted that taking Figure 2 the shown direction as an example, the X direction is the left and right direction of the steel box girder 4, the Y direction is the front and rear direction of the steel box girder, and the X direction and the Y direction are perpendicular to each other.

[0042] A control mechanism for controlling the front and rear sliding of the steel box girder 4 has been set in the Y direction of the steel box girder 4. The control mechanism is well known to those skilled in the art and will not be elaborated here.

[0043] For the sake of convenience, the following mainly describes controlling the sliding of the steel box girder 4 in the X direction.

[0044] It should be noted that the preset displacement point is the maximum displacement point of the steel box girder 4 sliding in the X direction.

[0045] Further, in this embodiment, S101, determining the maximum force value of the sliding direction of the steel box beam 4 and the preset displacement point, includes:

[0046] S1011. A ruler 5 is arranged on the side of the tower column 3 facing the steel box girder 4. One end of the ruler 5 is fixedly connected to the tower column 3, and the other end of the ruler 5 is placed on the top plate of the steel box girder 4.

[0047] Specifically, the ruler 5 extends along the X direction to overlap with the top plate portion of the steel box girder 4, and the overlapping length of the ruler 5 and the top plate is greater than or equal to 30 cm.

[0048] The end of the scale 5 away from the tower column 3 is movably overlapped with the top plate, that is, the steel box girder 4 can move relative to the scale 5. The scale 5 is used to measure the slip amount and slip point of the steel box girder 4 in the X direction in different time periods.

[0049] S1012. Record the displacement of the steel box girder 4 at different preset time nodes by the ruler 5 in different time periods until the displacement changes regularly and stably, and record the final displacement position of the steel box girder 4 at the maximum displacement.

[0050] Specifically, in different time periods, the steel box girder 4 is affected by the temperature difference to produce slip phenomenon of thermal expansion and contraction. The displacement of the steel box girder 4 is periodically monitored according to the on-site environmental conditions. The displacement of the steel box girder 4 at different ambient temperatures is cyclically monitored with a 24-hour period until the displacement of the steel box girder 4 changes regularly and stably, and the final displacement position of the steel box girder 4 with the maximum displacement is recorded.

[0051] S1013. Confirm the sliding direction of the steel box girder 4 through on-site observation to determine the sliding trajectory of the steel box girder 4.

[0052] S1014, a pressure sensor for detecting the maximum force value of a preset displacement point of the steel box girder 4 is provided between the tower column 3 and the steel box girder 4.

[0053] After the displacement of the steel box girder 4 changes regularly and stably, a pressure sensor is set between the tower column 3 and the steel box girder 4. To ensure the accuracy of the force data, the original designed displacement of the steel box girder 4 is taken as the minimum value, and a pressure sensor three times greater than the minimum value is selected to monitor the force of the steel box girder 4. The pressure sensor is placed horizontally, one end of the pressure sensor is detachably connected to the side of the steel box girder 4 facing the tower column 3, and the other end of the pressure sensor extends along the X direction.

[0054] Among them, the time for the pressure sensor to obtain the force value is the same as the time for obtaining the displacement.

[0055] Further, in this embodiment, before determining the maximum force value of the sliding direction of the steel box girder 4 and the preset displacement point, it further includes: arranging a sliding limit stress component 2 on one side of the tower column 3 facing the steel box girder 4.

[0056] Specifically, the pressure sensor is arranged between the sliding limit stress component 2 and the steel box girder 4. One end of the pressure sensor is detachably connected to the steel box girder 4, and the other end of the pressure sensor is used to act on the sliding limit stress component 2.

[0057] During the use process, record the pressure value of the pressure sensor acting on the sliding limit stress component 2 at the same time points and periods for monitoring the displacement. Finally, confirm the maximum displacement of the steel box girder 4 and the maximum force value corresponding to the maximum displacement. The collection and monitoring of the two data items of the maximum displacement and the maximum force value are carried out synchronously.

[0058] Ensure that the two data items of the maximum displacement and the maximum force value change stably and regularly for more than 72 hours to ensure that the data change conforms to the environmental conditions.

[0059] S1015. After the detection of the maximum force value of the preset displacement point of the steel box girder 4 is completed, remove the pressure sensor.

[0060] Specifically, after the pressure sensor detects the maximum force value of the maximum displacement point of the steel box girder 4, remove the pressure sensor from the steel box girder 4.

[0061] S102. Arrange a sliding control device 1 between the tower column 3 and the steel box girder 4 for controlling the sliding displacement of the steel box girder 4 to exceed the theoretical design value.

[0062] Specifically, install a sliding stress component 20 between the sliding limit stress component 2 and the steel box girder 4. It should be noted that the installation position of the sliding stress component 20 is basically the same as the installation position of the pressure sensor.

[0063] Further, in this embodiment, S102. Arrange a sliding control device 1 between the tower column 3 and the steel box girder 4 for controlling the sliding displacement of the steel box girder 4 to exceed the theoretical design value, including:

[0064] S1021. Manufacture the sliding control device 1 according to the maximum force value of the preset displacement point monitored by the pressure sensor.

[0065] Specifically, based on the maximum force values at the maximum displacement points monitored by the pressure sensor at different time and temperature nodes, calculate and select the specification model of the jack that can withstand the ultimate force value and the material specifications for manufacturing each component and unit component; ensure that the device does not deform or break under the ultimate force value environment, and can resist and control the displacement of the box girder through its own force and the reaction force that the jack can apply.

[0066] Continue to refer to Figures 2 to 8 , in this embodiment, the sliding control device 1 includes a base 10 and a force-bearing component 20. The force-bearing component 20 is arranged on one side of the base 10, and the force-bearing component 20 is connected to the base 10 in an adjustable manner; the force-bearing component 20 is used to control the sliding displacement of the steel box girder 4 not to exceed the theoretical design value; the base 10 is used to buffer the sliding of the steel box girder 4.

[0067] Specifically, during use, the side of the base 10 facing away from the force-bearing component 20 is fixedly connected to the side of the steel box girder 4 facing the tower column 3, and the side of the force-bearing component 20 facing away from the base 10 abuts against the sliding limit force-bearing component 2.

[0068] Exemplarily, the base 10 can be connected to the steel box girder 4 by means of bolt connection. Of course, the base 10 can also be connected to the steel box girder 4 by means of adhesion.

[0069] Taking Figure 2 the shown orientation as an example, during the process of the steel box girder 4 sliding to the left, the steel box girder 4 exerts pressure on the base 10, the base 10 exerts pressure on the force-bearing component 20, and the force-bearing component 20 exerts pressure on the sliding limit force-bearing component 2; by setting the sliding control device 1, thus, it is avoided that the displacement of the steel box girder 4 in the X direction exceeds the theoretical design value, the bridge is prevented from being damaged, and the service life of the bridge is extended.

[0070] Furthermore, in this embodiment, the force-bearing component 20 includes a first adjustment unit 21 and a second adjustment unit 22. One end of the first adjustment unit 21 is connected to the base 10 in an adjustable manner, and the other end of the first adjustment unit 21 is connected to the second adjustment unit 22; the first adjustment unit 21 is used to adjust the height of the sliding control device 1 to relieve the sharp displacement of the steel box girder 4 under special circumstances and avoid instant damage to corresponding components such as the sliding control device 1, the beam body or the tower column; the second adjustment unit 22 is used to bear the pressure generated when the steel box girder 4 is displaced.

[0071] Specifically, the limit value of the sliding displacement of the steel box girder 4 is derived from the theoretical value of the bridge center line. By setting the sliding limit force-bearing assembly 2 at the position on the inner side of the tower column 3 opposite to the steel box girder 4, the height of the sliding limit force-bearing assembly 2 is preset according to the calculation result of the displacement theoretical value of the steel box girder 4, so as to form a preset minimum sliding distance between the side plate of the steel box girder 4 and the friction force-bearing plate 202, and a certain redundant expansion amount is reserved according to the theoretical calculation to serve as a buffer when the device abuts against the friction force-bearing plate 202 during the sliding of the steel box girder 4. Further, the total height of the sliding control device 1 is basically the same as the minimum sliding distance of the steel box girder 4..

[0072] It should be noted that the total height of the sliding control device 1 is the distance between the top surface of the second adjustment unit 22 and the bottom surface of the base 10.

[0073] During use, one end of the second adjustment unit 22 away from the first adjustment unit 21 abuts against the sliding limit force-bearing assembly 2, and one end of the base 10 away from the first adjustment unit 21 is connected to the steel box girder 4.

[0074] Further, in this embodiment, the first adjustment unit 21 includes a box body 211 and a jack 212. The box body 211 encloses an accommodation cavity, the jack 212 is accommodated in the accommodation cavity, the box body 211 is adjustably connected to the base 10 through an anti-detachment mother and son bolt 213, and the box body 211 can slide relative to the anti-detachment mother and son bolt 213 to adjust the preset distance between the box body 211 and the base 10; the bottom end of the jack 212 abuts against the base 10, and the top end of the jack 212 is inserted into the second adjustment unit 22; by setting the box body 211, the box body 211 plays a fixing role on the jack 212.

[0075] When different force values gradually generated by environmental factors occur during the displacement of the steel box girder 4, the jack 212 will timely compensate or release the limiting condition of the sliding control device 1 according to the actual situation to ensure that the preset natural expansion and contraction displacement of the steel box girder 4 is not overly interfered, and further ensure that the preset condition of the steel box girder 4 is stable and not interfered by human factors.

[0076] Specifically, the box body 211 can be formed by enclosing steel plates. Openings are provided at both the top end and the bottom end of the accommodation cavity, and the openings are communicated with the accommodation cavity. During use, the bottom end of the jack 212 abuts against the side of the base 10 away from the steel box girder 4 through the opening at the bottom end of the accommodation cavity, and one end of the second adjustment unit 22 away from the sliding limit force-bearing assembly 2 is sleeved on the top end of the jack 212 through the opening at the top end of the accommodation cavity to realize the connection between the first adjustment unit 21 and the second adjustment unit 22.

[0077] Exemplarily, the box body 211 can be in the shape of a cuboid. Of course, the box body 211 can also be in the shape of a cylinder.

[0078] Continue to refer to Figure 8In this embodiment, the outer walls on opposite sides of the box body 211 are provided with bosses 2111, and the bosses 2111 extend outward along the length direction of the box body 211. At least one through hole is opened on the boss 2111, and the through hole extends along the height direction of the box body 211. The anti-slipping parent and child bolt 213 is penetrated in the through hole.

[0079] Among them, the anti-slip parent-child bolt 213 includes a sleeve 2132 and a slide rod 2131. The slide rod 2131 is inserted into the sleeve 2132, and the slide rod 2131 is connected with the sleeve 2132. A certain gap is preset between the outer wall of the slide rod 2131 and the inner wall of the sleeve 2132 for applying lubricant. The preset length of the slide rod 2131 is the maximum value of the preset height of the device, and is used to control the ejection length of the jack to prevent the risk of excessive ejection of the jack causing instability of the device or falling of the jack; an anti-slip limit plate 2133 is provided at the top of the slide rod 2131, and the diameter of the anti-slip limit plate 2133 is slightly larger than the outer diameter of the sleeve 2132; the sleeve 2132 is inserted into the through hole to further fix the stability of the sleeve 2132.

[0080] The top end of the slide rod 2131 passes through the base 10 and is inserted into the sleeve 2132. When the jack is being raised or lowered, the slide rod 2131 slides with the sleeve 2132 to adjust the preset distance between the bottom end of the box body 211 and the base 10, and assists in strengthening the stability and safety of the active connection between the base 10 of the device and the force-bearing component 20.

[0081] Specifically, the central axis of the telescopic rod is arranged parallel to the central axis of the sleeve 2132. In some feasible embodiments, the central axis of the telescopic rod and the central axis of the sleeve 2132 are arranged colinearly.

[0082] Exemplarily, three through holes may be provided on the boss 2111 , and the three through holes are spaced apart along the width direction of the box body 211 , and the number of the through holes is substantially the same as the number of the anti-slip parent and child bolts 213 .

[0083] In this embodiment, the length of the sliding rod 2131 is three times the length of the sleeve 2132 .

[0084] Furthermore, in the present embodiment, the second adjustment unit 22 includes a roller box 221 and a roller unit 222. The roller box 221 is arranged to form an accommodating cavity, and the roller unit 222 is partially inserted in the accommodating cavity. The roller unit 222 can slide relative to the roller box 221. A limit ring 2211 is provided at the bottom end of the roller box 221, and the limit ring 2211 is used to be mounted on one end of the first adjustment unit 21.

[0085] Taking the plane perpendicular to the central axis of the limiting ring 2211 as the cross section, the cross-sectional shape of the roller box 221 can be rectangular, rhombus or other polygonal.

[0086] In an implementable manner where the cross-sectional shape of the roller box 221 is rectangular, the top end of the accommodation cavity is open, and sliding grooves 2212 are provided on both outer side walls near the top end of the roller box 221. The two sliding grooves 2212 are arranged oppositely, the sliding grooves 2212 extend along the length direction of the roller box 221, both of the two sliding grooves 2212 penetrate the outer side wall of the roller box 221, and both of the two sliding grooves 2212 communicate with the accommodation cavity.

[0087] During the use process, the opposite ends of the roller unit 222 are respectively inserted into the two sliding grooves 2212, and the roller unit 222 can slide along the extending direction of the sliding grooves 2212.

[0088] Furthermore, in this embodiment, the roller unit 222 includes a connecting frame 2221 and a plurality of rollers 2222. The connecting frame 2221 encloses an installation space, and a plurality of rollers 2222 are all arranged in the installation space. The plurality of rollers 2222 are arranged at intervals along the extending direction of the connecting frame 2221, and the plurality of rollers 2222 can all rotate relative to the connecting frame 2221; by providing the connecting frame 2221, the plurality of rollers 2222 form a whole, thereby improving the control performance of the roller unit 222.

[0089] Specifically, the central axes of the plurality of rollers 2222 are all arranged in parallel, and the plurality of rollers 2222 all extend along the width direction of the roller box 221. During the use process, the two ends of the roller 2222 respectively pass through the two sliding grooves 2212 and are connected to the opposite sides of the connecting member, that is to say, the connecting frame 2221 is located outside the roller box 221.

[0090] Among them, the depth of the accommodation cavity is 3 / 2 of the diameter of the roller 2222.

[0091] In this embodiment, the connecting frame 2221 is U-shaped. During the use process, the roller box 221 is inserted into the connecting frame 2221 through the open end of the connecting frame 2221, and the two ends of the roller 2222 respectively pass through the two sliding grooves 2212 and are connected to the opposite sides of the connecting frame 2221.

[0092] In order to improve the strength of the connecting frame 2221, a connecting rod 2223 is arranged in the installation space of the connecting frame 2221. The connecting rod 2223 extends along the central axis direction of the roller 2222, and both ends of the connecting rod 2223 are connected to the two inner walls of the installation space.

[0093] Furthermore, in this embodiment, the base 10 includes a mounting plate 11 and a buffer block 12, and the buffer block 12 is arranged on one side of the mounting plate 11.

[0094] Specifically, the buffer block 12 is made of a rubber plate with a preset thickness and strength, and the buffer block 12 is arranged on the side of the mounting plate 11 facing the force-receiving component 20.

[0095] The buffer block 12 may be circular, rectangular or other polygonal in shape, which is not limited in this embodiment.

[0096] In an achievable manner in which the buffer block 12 is circular, the central axis of the buffer block 12 is parallel to the central axis of the jack 212 . In some achievable manners, the central axis of the buffer block 12 is colinearly arranged with the central axis of the jack 212 .

[0097] During use, the bottom end of the jack 212 abuts against the side of the buffer block 12 away from the friction force plate 202. The preset distance between the bottom end of the box 211 and the base 10 does not exceed the length of the slide bar 2131 at most, and does not exceed the preset thickness of the buffer pad.

[0098] S1022, setting the sliding control device 1 between the sliding limit force bearing component 2 and the steel box girder 4.

[0099] Specifically, the installation position of the sliding control device 1 is substantially consistent with the installation position of the pressure sensor.

[0100] Continue to refer to Figure 2 and Figure 3 In this embodiment, the sliding limit force component 2 includes a fixed block 201 and a friction force plate 202, the friction force plate 202 is connected to one end of the fixed block 201, and the end of the fixed block 201 away from the friction force plate 202 is connected to the side wall of the tower column 3.

[0101] During use, the outer peripheral wall of the roller 2222 abuts against the side of the friction force plate 202 away from the fixed block 201 , and the side of the mounting plate 11 away from the buffer block 12 is connected to the steel box girder 4 .

[0102] It should be noted that the center lines of the steel box girder 4, the sliding control device 1 and the sliding limit force bearing assembly 2 are arranged to coincide with each other.

[0103] When installing the sliding control device 1 provided in the present embodiment, temporary suspension measures are firstly taken to prevent the sliding control device 1 from being deformed due to excessive cantilever force, and then the jack 212 is started to make the outer peripheral wall of the roller 2222 in the sliding control device 1 fit with the friction force plate 202, and a preset pressure is applied. According to the monitoring data of the pressure sensor, the extension and retraction of the jack 212 is timely adjusted according to the displacement indicated by the scale 5, and the mounting plate 11 is connected to the side of the steel box girder 4 facing the tower column 3, and the distance of the sliding displacement of the steel box girder 4 toward the tower column 3 is always kept at the preset value without exceeding the limit, so as to smoothly implement the construction process of the bridge cable.

[0104] The specific implementation process of the control method provided in this embodiment is as follows: The sliding direction of the steel box girder 4 is judged with the tower column 3 and the expansion joint as the reference objects. Then, the maximum displacement point of the steel box girder 4 is determined by the scale 5, and the maximum force value at the maximum displacement point is determined by the pressure sensor. After monitoring the maximum force value at the maximum displacement point, the pressure sensor is removed from the steel box girder 4, and the sliding control device 1 is manufactured according to the maximum force value at the maximum displacement point. After the sliding control device 1 is manufactured, the sliding control device 1 is installed at the position of the pressure sensor.

[0105] The control method for the temporary sliding displacement of the steel box girder 4 provided in this application includes the following steps: determining the maximum force value of the sliding direction of the steel box girder 4 and the preset displacement point; arranging a sliding control device 1 between the tower column 3 and the steel box girder 4 to control the sliding displacement of the steel box girder 4 from exceeding the theoretical design value; by arranging the sliding control device 1 between the tower column 3 and the steel box girder 4, compared with the displacement control that may occur during the construction of traditional bridges, thus, it avoids the varying degrees of damage and injury to the moving structure and the limiting structure caused by rigid control. At the same time, this control method pays more attention to ensuring that the technical parameters and theoretical data designed in the construction process do not undergo essential changes, and takes into account the controllability of the preset displacement of the steel box girder 4, which not only satisfies the free telescopic sliding within the preset displacement range of the beam body itself, but also ensures that it does not have over-limit and excessive displacement caused by external forces; solves the problem that the structure of the steel box girder 4 has a sliding displacement exceeding the theoretical design value and avoids damage to the bridge structure; at the same time, this control method has the advantages of high control accuracy, high control efficiency, and flexible adjustment, ensuring the controllability, safety, and high efficiency of the full-cycle construction quality in the stay cable stage.

[0106] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0107] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A control method for the temporary sliding displacement of a steel box girder, characterized in that: It includes the following steps: Determine the maximum force value of the sliding direction of the steel box girder and the preset displacement point; A sliding control device for controlling the sliding displacement of the steel box girder to exceed the theoretical design value is arranged between the tower column and the steel box girder; The determination of the maximum force value of the sliding direction of the steel box girder and the preset displacement point includes: A scale is arranged on the side of the tower column facing the steel box girder. One end of the scale is fixedly connected to the tower column, and the other end of the scale is placed on the top plate of the steel box girder; Record the displacement of the steel box girder at different preset time nodes through the scale at different time periods until the displacement changes regularly and stably, and record the final displacement position of the steel box girder at the maximum displacement; Confirm the sliding direction of the steel box girder through on-site observation to determine the sliding trajectory of the steel box girder; A pressure sensor for detecting the maximum force value of the preset displacement point of the steel box girder is arranged between the tower column and the steel box girder; After the detection of the maximum force value of the preset displacement point of the steel box girder is completed, the pressure sensor is removed; The sliding control device includes a base and a stress component. The stress component is arranged on one side of the base, and the stress component is adjustably connected to the base; The stress component is used to control the sliding displacement of the steel box girder not to exceed the theoretical design value; The base is used to buffer the sliding of the steel box girder; The stress component includes a first adjustment unit and a second adjustment unit. One end of the first adjustment unit is adjustably connected to the base, and the other end of the first adjustment unit is connected to the second adjustment unit; The first adjustment unit is used to adjust the height of the sliding control device to relieve the sharp displacement of the steel box girder; The second adjustment unit is used to bear the pressure generated when the steel box girder is displaced.

2. The control method for the temporary sliding displacement of the steel box girder according to claim 1, wherein: Before determining the maximum force value of the sliding direction of the steel box girder and the preset displacement point, it also includes: A sliding limit stress component is arranged on the side of the tower column facing the steel box girder.

3. The control method for the temporary sliding displacement of the steel box girder according to claim 2, characterized in that: The arrangement of the sliding control device for controlling the sliding displacement of the steel box girder to exceed the theoretical design value between the tower column and the steel box girder includes: Manufacture the sliding control device according to the maximum force value of the preset displacement point monitored by the pressure sensor; The sliding control device is arranged between the sliding limit stress component and the steel box girder.

4. The control method for the temporary sliding displacement of the steel box girder according to claim 1, characterized in that: The first adjustment unit includes a box body and a jack. The box body encloses an accommodation cavity, and the jack is accommodated in the accommodation cavity. The box body is adjustably connected to the base through an anti-detachment mother and son bolt, and the box body can slide relative to the anti-detachment mother and son bolt to adjust the preset distance between the box body and the base; The bottom end of the jack abuts against the base, and the top end of the jack is inserted into the second adjustment unit.

5. The control method for the temporary sliding displacement of the steel box girder according to claim 1, characterized in that: The second adjustment unit includes a roller box and a roller unit. The roller box encloses an accommodation cavity, and part of the roller unit is inserted into the accommodation cavity, and the roller unit can slide relative to the roller box; A limit ring is arranged at the bottom end of the roller box, and the limit ring is used to sleeved on one end of the first adjustment unit.

6. The control method for the temporary sliding displacement of the steel box girder according to claim 5, characterized in that: The roller unit includes a connecting frame and a plurality of rollers. The connecting frame is arranged to form an installation space. The plurality of rollers are arranged in the installation space. The plurality of rollers are arranged at intervals along the extension direction of the connecting frame. The plurality of rollers can rotate relative to the connecting frame.

7. The control method for the temporary sliding displacement of the steel box girder according to claim 1, wherein: The base includes a mounting plate and a buffer block, and the buffer block is arranged on one side of the mounting plate.

8. The control method for the temporary sliding displacement of the steel box girder according to claim 2, characterized in that: The sliding limit force bearing assembly comprises a fixed block and a friction force bearing plate, wherein the friction force bearing plate is connected to one end of the fixed block, and one end of the fixed block away from the friction force bearing plate is connected to the side wall of the tower column.

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