A pushing structure and a construction method for pushing a steel box girder

Abstract

The present invention discloses a pushing structure and a construction method for pushing a steel box girder. The pushing structure includes a steel box girder, temporary piers and a pushing assembly. A deviation correction beam is convexly provided on the lower surface of the steel box girder. A support platform and support columns located on the support platform are provided at the top of the temporary piers. The pushing assembly includes a jacking mechanism, a translation mechanism and a deviation correction mechanism arranged on the support platform from bottom to top. The deviation correction mechanism includes a support seat and a deviation correction structure. The support seat is used to support the steel box girder, and a limiting groove corresponding to the deviation correction beam is concavely provided at the top of the support seat. The deviation correction structure is used to drive the support seat to drive the steel box girder to correct the deviation transversely. A stop member and a support member are oppositely arranged between the support column and the translation mechanism. The stop member supports the support member to fix the height of the steel box girder. The present invention aims to solve the problems of poor stability during the construction process caused by the transverse deviation of the steel box girder and uneven jacking heights at multiple points during the existing steel box girder pushing construction.

Description

Technical Field

[0001] The present invention relates to the technical field of incremental launching construction of steel box girders, and particularly relates to an incremental launching structure and a method for incremental launching construction of steel box girders. Background Art

[0002] The existing laying method of steel box girders across expressways generally adopts the incremental launching construction method. During the construction process, the assembled steel box girder needs to be incrementally launched. This construction method can reduce the impact on the traffic of the existing expressway. In the existing incremental launching structure and the incremental launching construction process, there are problems of lateral deviation of the steel box girder, and there may be differences in the installation height or the jacking height of the jacking devices at each jacking point, which affects the laying stability of the steel box girder during the construction process. Summary of the Invention

[0003] The main object of the present invention is to propose an incremental launching structure and a method for incremental launching construction of steel box girders, aiming to solve the problems of easy lateral deviation of the steel box girder during the existing incremental launching construction of the steel box girder and poor construction process stability caused by uneven jacking heights at multiple points.

[0004] To achieve the above object, an incremental launching structure proposed by the present invention includes:

[0005] A steel box girder, which is longitudinally extended, and a longitudinally extended deviation correction beam is convexly provided on the lower surface of the steel box girder;

[0006] A temporary pier, including a pier column and a support platform provided at the top of the pier column. Two laterally spaced support columns are convexly provided at the top of the support platform. The two support columns are used to support the steel box girder, and an installation area is defined between the two support columns. The deviation correction beam corresponds to the installation area; and,

[0007] An incremental launching assembly, including a jacking mechanism, a translation mechanism, and a deviation correction mechanism. The jacking mechanism includes a jacking device installed in the installation area and a jacking seat installed on the top of the jacking device; the translation mechanism includes a movable seat installed on the jacking seat and a horizontal driving device located between the jacking seat and the movable seat. The horizontal driving device drives the movable seat to longitudinally translate; the deviation correction mechanism includes a support seat that can move laterally and is installed on the movable seat, and a deviation correction structure installed between the support seat and the support column. A longitudinally extended limiting groove is provided at the top of the support seat. The limiting groove corresponds to the deviation correction beam, and a guiding portion with an increasing groove width from bottom to top is provided at the notch of the limiting groove;

[0008] Among them, the deviation rectifying structure includes two deviation rectifying protrusions convexly arranged on the opposite side surfaces of the two support columns and two pushing protrusions convexly arranged at the transverse two ends of the support seat. At least one of the two end surfaces of the pushing protrusion opposite to the deviation rectifying protrusion is inclined, so that during the upward jacking process of the jacking mechanism, the deviation rectifying beam first extends into the limiting groove along the guiding part, and then the pushing protrusion abuts against the deviation rectifying protrusion and slides transversely, thereby driving the support seat to move transversely to drive the steel box girder to move transversely for deviation rectification;

[0009] A stop member extending into the installation area is arranged on the support column corresponding to the position of the movable seat. A corresponding support member is arranged on the movable seat. At least one of the support member and the stop member is movably arranged, so as to have a support state in which the stop member abuts against the bottom of the support member to support the movable seat, and an avoidance state in which the stop member avoids the support member. When the stop member and the support member are in the support state, the height of the steel box girder jacked up by the jacking assembly is fixed.

[0010] Optionally, the movable seat includes:

[0011] A movable base, which is longitudinally movably installed on the jacking seat, and a plurality of pressing rods are convexly arranged on the top of the movable base;

[0012] A floating seat, which is installed on the movable base, and an elastic support member is arranged between the floating seat and the movable base. Avoidance holes are formed at the positions of the bottom of the floating seat corresponding to the pressing rods. Accommodating holes extending transversely are formed on both sides of the floating seat in the transverse direction. Each accommodating hole communicates with one of the avoidance holes. A jacking rod penetrating through the accommodating hole is arranged on the support member. One of the end parts of the jacking rod and the end part of the pressing rod is inclined, so that when the jacking assembly jacks up the steel box girder, the floating seat is compressed to compress the elastic support member to approach the movable base, and the pressing rod extends into the avoidance hole to push the jacking rod, so that the support member extends transversely out of the floating seat; An elastic connecting member is arranged between the accommodating hole and the jacking rod, so that when the pressing rod disengages from the jacking rod, the elastic connecting member resets the jacking rod so that the support member contracts into the floating seat;

[0013] The support seat is installed on the floating seat; the stop member is movably arranged on the support column, so as to have an avoidance state in which the stop member avoids the support member and a support state in which the stop member supports the support member.

[0014] Optionally, the stopper is rotatably mounted on the support column, and the stopper has a support end face located above and a abutting end face located below. The abutting end face abuts against the support column so that the support end face can support the support member. When the support member abuts against the stopper from bottom to top, the stopper is driven to rotate to avoid the support member. When the support member abuts against the stopper from top to bottom, the abutting end face abuts against the support column, and the support end face supports the support member;

[0015] A driving member is further arranged between the stopper and the support column, and the driving member can drive the support column to rotate.

[0016] Optionally, the support column protrudes with a limiting convex portion towards the installation area, the stopper is rotatably mounted on the limiting convex portion, and the limiting convex portion is used to abut and limit the jacking height of the jacking seat.

[0017] Optionally, the vertical distance between the jacking seat and the limiting convex portion is H; when the support seat is horizontally centered, the upward moving distance of the pushing convex portion until it abuts against the correcting convex portion is h, then H ≤ h.

[0018] Optionally, the elastic support member includes a support spring sleeved on the pressure rod; and / or,

[0019] The elastic connecting member includes a connecting spring sleeved on the ejector rod.

[0020] Optionally, the horizontal driving device includes a guiding rack arranged on the jacking seat and a driving gear arranged on the movable seat. The guiding rack extends longitudinally, and the driving gear meshes with the guiding rack to drive the movable seat to move longitudinally.

[0021] Optionally, a receiving groove is formed at the top of the jacking seat, the translation mechanism is installed in the receiving groove, and the groove wall of the receiving groove limits the longitudinal movement distance of the translation mechanism.

[0022] Optionally, the jacking device includes a plurality of hydraulic cylinders, and a plurality of installation holes are formed on the support platform, and one hydraulic cylinder is embedded in one installation hole.

[0023] The present invention also provides a steel box girder jacking construction method based on the pushing structure. Among them, two temporary piers are longitudinally arranged at intervals or two pushing components are longitudinally arranged at intervals on one temporary pier. The steps of the steel box girder jacking construction method include:

[0024] S1: Reset the two pushing components to the initial state;

[0025] S2: The jacking mechanism in any of the pushing components jacks upward. During the jacking process, first, the deviation-correcting beam on the steel box girder extends into the limit groove along the guiding part, and then the support seat abuts against the bottom of the steel box girder and jacks it up until the pushing convex part on the support seat cooperates with the deviation-correcting convex part to complete the lateral deviation correction of the steel box girder. At this time, the pushing component is in the deviation-correcting state;

[0026] S3: The jacking mechanism in the pushing component in the deviation-correcting state sinks, and the support in the supporting state abuts against the stopper to fix the height at which the pushing component jacks up the steel box girder. At this time, the pushing component is in the translation state;

[0027] S4: The translation mechanism in the pushing component in the translation state drives the steel box girder to longitudinally move forward by a set distance, and determines whether the steel box girder reaches the designated position;

[0028] S5: If the steel box girder does not reach the designated position, the jacking mechanism in the pushing component in the initial state jacks upward until the pushing component enters the deviation-correcting state;

[0029] At this time, the pushing component in the translation state loses its load, the support and the stopper switch to the avoidance state, and the pushing component resets to the initial state;

[0030] S6: After completing step S5, execute step S3; or,

[0031] S7: If the steel box girder reaches the designated position, the jacking mechanism in the pushing component in the translation state jacks upward until the pushing component enters the deviation-correcting state to perform the deviation correction operation again. The support and the stopper switch to the avoidance state, and then the jacking mechanism sinks until the steel box girder is placed on the support column, and the pushing component resets to the initial state.

[0032] In the technical solution of the present invention, the jacking mechanism is used to jack up the translation mechanism, and then jack up the deviation rectifying mechanism to lift the steel box girder. The translation mechanism can move longitudinally to drive the steel box girder to move forward longitudinally, realizing the jacking and pushing laying of the steel box girder. During the jacking process of the jacking mechanism, the deviation rectifying mechanism corrects the lateral deviation of the steel box girder, without the need to set additional deviation rectifying driving parts, simplifying the structure and having a clever design. After the jacking and deviation rectifying are completed, the jacking mechanism sinks. At this time, the support member on the translation mechanism is supported by the stop member on the support column to fix the height of the steel box girder. The height of the stop member and the position of the support member can be accurately set, which can avoid the difference in the jacking height of the jacking mechanisms at multiple points. At the same time, when the translation mechanism moves longitudinally, it slides along the upper end surface of the stop member, ensuring the stability of the longitudinal translation of the translation mechanism. In summary, the stability of the laying of the steel box girder can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic plan view of the jacking and pushing assembly in an embodiment of the jacking and pushing structure provided by the present invention when it is in the initial state;

[0035] Figure 2 is Figure 1 a schematic plan view of the support member and the stop member in the avoidance state in;

[0036] Figure 3 is Figure 1 a schematic plan view of the jacking and pushing assembly in the deviation rectifying state in;

[0037] Figure 4 is Figure 1 a schematic plan view of the jacking and pushing assembly in the translation state in;

[0038] Figure 5 is Figure 1 a three-dimensional front view schematic of the temporary pier and the jacking and pushing assembly in;

[0039] Figure 6 is Figure 3 a partial cross-sectional schematic of part A in;

[0040] Figure 7 It is a schematic flow chart of the steel box girder jacking and pushing construction method provided by the present invention.

[0041] Description of the attached drawing reference numerals:

[0042]

[0043]

[0044] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the attached drawings. Specific embodiments

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0046] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present invention, the descriptions of "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0048] The existing laying method of steel box girders across expressways generally adopts the jacking construction method. During the construction process, the assembled steel box girder needs to be jacked. This construction method can reduce the impact on the traffic of the existing expressway. In the existing jacking structure and during the jacking construction process, there is a problem of lateral deviation of the steel box girder, and there may be differences in the installation height of the jacking devices or the jacking height of the jacking devices at each jacking point, which affects the laying stability of the steel box girder during the construction process.

[0049] In view of this, the present invention provides a jacking structure, Figures 1 to 6This is an embodiment of the pushing structure provided by the present invention. The pushing structure will be described below with reference to specific drawings.

[0050] Please refer to Figure 1 Figure 6The jacking structure 1000 includes a steel box girder 1, a temporary pier 2 and a jacking assembly 3. The steel box girder 1 is longitudinally extended, and a longitudinally extending correcting beam 11 is convexly provided on the lower surface of the steel box girder 1; the temporary pier 2 includes a pier column 21 and a support platform 22 provided on the top of the pier column 21, and two support columns 23 are convexly provided on the top of the support platform 22 at a transverse interval. The two support columns 23 are used to support the steel box girder 1, and the two support columns 23 define an installation area between them, and the correcting beam 11 corresponds to the installation area; the jacking assembly 3 includes a jacking mechanism 31, a translation mechanism 32 and a correcting mechanism 33. The jacking mechanism 31 includes an installation The jacking device 311 in the installation area and the jacking seat 312 installed on the top of the jacking device 311; the translation mechanism 32 includes a movable seat 321 installed on the jacking seat 312 and a horizontal driving device 322 located between the jacking seat 312 and the movable seat 321, and the horizontal driving device 322 drives the movable seat 321 to translate longitudinally; the correcting mechanism 33 includes a support seat 331 which can be moved laterally and is installed on the movable seat 321, and a correcting structure installed between the support seat 331 and the support column 23, and the top of the support seat 331 is provided with a longitudinally extending limit groove 3311, and the limit groove 3311 corresponds to the The correcting beam 11 is provided, and the notch of the limiting groove 3311 is provided with a guide portion 3311a with a gradually increasing groove width from bottom to top; wherein, the correcting structure includes two correcting protrusions 231 protruding on the opposite sides of the two support columns 23 and two pushing protrusions 332 protruding at the two lateral ends of the support seat 331, and at least one of the two end surfaces of the pushing protrusion 332 opposite to the correcting protrusion 231 is inclined, so that during the upward lifting process of the jacking mechanism 31, the correcting beam 11 first extends into the limiting groove 3311 along the guide portion 3311a, and then the pushing protrusion 332 is held against the correcting protrusion 231 and slides laterally, thereby driving the support seat 3 The lateral movement of 31 drives the steel box girder 1 to move horizontally for correction; the support column 23 is provided with a stopper 232 extending into the installation area corresponding to the position of the movable seat 321, and the movable seat 321 is provided with a corresponding support member 3213, and at least one of the support member 3213 and the stopper 232 is movably arranged so that the stopper 232 is in a supporting state against the bottom of the support member 3213 to support the movable seat 321, and the stopper 232 is in an avoiding state away from the support member 3213. When the stopper 232 and the support member 3213 are in the supporting state, the height of the jacking assembly 3 to lift the steel box girder 1 is fixed.

[0051] In the technical solution of the present invention, the jacking mechanism 31 is used to jack up the translation mechanism 32, and further jack up the deviation rectifying mechanism 33 to lift the steel box girder 1. The translation mechanism 32 can move longitudinally to drive the steel box girder 1 to move forward longitudinally, so as to realize the jacking and laying of the steel box girder 1. During the jacking process of the jacking mechanism 31, the deviation rectifying mechanism 33 corrects the lateral deviation of the steel box girder 1, without the need to set an additional deviation rectifying driving part, which simplifies the structure and has a clever design. After the jacking and deviation rectifying are completed, the jacking mechanism 31 sinks. At this time, the support member 3213 on the translation mechanism 32 is supported by the stopper 232 on the support column 23 to fix the height of the steel box girder 1. The height of the stopper 232 and the position of the support member 3213 can be accurately set, which can avoid the difference in the jacking height of the jacking mechanisms 31 at multiple points. At the same time, when the translation mechanism 32 moves longitudinally, it slides along the upper end surface of the stopper 232, ensuring the stability of the longitudinal translation of the translation mechanism 32. In summary, the stability of the laying of the steel box girder 1 can be improved.

[0052] Specifically, a deviation-correcting beam 11 protrudes downward from the lower end of the steel box girder 1. A limit groove 3311 is formed at the top of the support base 331, and a guiding portion 3311a is provided at the notch of the limit groove 3311. During the process of the support base 331 rising and jacking up the steel box girder 1, the deviation-correcting beam 11 preferentially slides into the limit groove 3311 along the guiding portion 3311a. If the steel box girder 1 has a lateral offset, the deviation-correcting beam 11 abuts against the groove wall of the limit groove 3311 to push the support base 331 to laterally offset. The support base 331 continues to move upward, and the pushing convex portion 332 on the support base 331 abuts against the deviation-correcting convex portion 231 on the support column 23 and relatively slides due to the presence of an inclined surface, so as to drive the support base 331 to move laterally to reset to the middle position between the two laterally spaced support columns 23, and synchronously drive the steel box girder 1 to move laterally to complete deviation correction. The whole process is completed by the jacking action of the jacking mechanism 31, without the need to set additional driving parts, and the design is ingenious. In addition, after the jacking and deviation correction are completed, the jacking mechanism 31 sinks to drive the translation mechanism 32 to move downward to the stop member 232 to support the support member 3213, and then the translation mechanism 32 longitudinally translates to drive the steel box girder 1 to longitudinally move. It can be understood that at least two of the jacking assemblies 3 need to be transversely spaced on the steel box girder 1, so that the steel box girder 1 has at least two jacking points. The height of the stop member 232 in the two jacking assemblies 3 that accurately supports the support member 3213 is set so that the steel box girder 1 remains horizontal during the longitudinal movement, thereby avoiding the problem of the steel box girder 1 being laterally inclined due to the difference in the jacking height of the jacking mechanism 31 at the two jacking points, and further avoiding the steel box girder 1 longitudinally moving in a laterally inclined state, improving the stability of the longitudinal movement of the steel box girder 1, and avoiding the lateral force exerted on the jacking mechanism 31 by the lateral inclination of the steel box girder 1, thereby avoiding damage to the jacking mechanism 31 and prolonging the service life of the jacking mechanism 31.

[0053] Based on the above jacking structure 1000, please refer to Figure 7 , the present invention further provides a construction method for jacking a steel box girder. Among them, two temporary piers 2 are longitudinally spaced or two jacking assemblies 3 are longitudinally spaced on one temporary pier 2. The steps of the construction method for jacking the steel box girder include:

[0054] S1: Reset the two jacking assemblies 3 to the initial state;

[0055] S2: The jacking mechanism 31 within any one of the pushing components 3 jacks upwards. During the jacking process, first, the deviation-correcting beam 11 on the steel box girder 1 extends into the limiting groove 3311 along the guiding portion 3311a. Then, the supporting seat 331 abuts against the bottom of the steel box girder 1 and jacks it up until the pushing convex portion 332 on the supporting seat 331 cooperates with the deviation-correcting convex portion to complete the lateral deviation correction of the steel box girder 1. At this time, the pushing component 3 is in the deviation-correcting state;

[0056] S3: The jacking mechanism 31 within the pushing component 3 in the deviation-correcting state sinks, and the supporting member 3213 in the supporting state abuts against the stopper 232 to fix the height at which the pushing component 3 jacks up the steel box girder 1. At this time, the pushing component 3 is in the translation state;

[0057] S4: The translation mechanism 32 within the pushing component 3 in the translation state translates to drive the steel box girder 1 to longitudinally move forward by a set distance, and determines whether the steel box girder 1 reaches the designated position;

[0058] S5: If the steel box girder 1 does not reach the designated position, the jacking mechanism 31 within the pushing component 3 in the initial state jacks upwards until the pushing component 3 enters the deviation-correcting state;

[0059] At this time, the pushing component 3 in the translation state loses its load, the supporting member 3213 and the stopper 232 switch to the avoidance state, and the pushing component 3 resets to the initial state;

[0060] S6: After completing step S5, execute step S3; or,

[0061] S7: If the steel box girder 1 reaches the designated position, the jacking mechanism 31 within the pushing component 3 in the translation state jacks upwards until the pushing component 3 enters the deviation-correcting state to perform the deviation correction operation again. The supporting member 3213 and the stopper 232 switch to the avoidance state, and then the jacking mechanism 31 sinks until the steel box girder 1 is placed on the support column 23, and the pushing component 3 resets to the initial state.

[0062] In the technical solution of the present invention, by arranging two of the pushing components 3 at the same jacking point to alternately perform the pushing operation, the idle period when the steel box girder 1 stalls when the pushing component 3 places the steel box girder 1 on the support column 23 and then resets to the initial position is reduced, and the construction efficiency is improved. And based on the above-mentioned pushing structure 1000, after the jacking mechanism 31 jacks up the steel box girder 1 to complete the deviation correction, the sinking step will be preferentially performed until the stopper 232 supports the support member 3213, and then the longitudinal translation action will be performed. In this way, after the first pushing component 3 completes the longitudinal translation step, the pushing component 3 does not need to perform an additional sinking operation. The second pushing component 3 directly executes the jacking deviation correction step, and the steel box girder 1 can be separated from the first pushing component 3. Then, after the first pushing component 3 loses the load, it performs a reset operation to return to the initial state. That is, the situation where the second pushing component 3 needs to be jacked up to carry the steel box girder 1 and the first pushing component 3 needs to be separately set to perform the sinking operation is avoided, and the action process is optimized to make it more smooth. Secondly, after the second pushing component 3 is jacked up to take over the load of the steel box girder 1 and continues to move upward, on the one hand, it is to make the first pushing component 3 lose the load, so that the stopper 232 in the supporting state and the support member 3213 can be switched to the avoiding state, so as to facilitate the reset of the first pushing component 3. On the other hand, the steel box girder 1 is corrected again to improve the construction accuracy. In addition, when the steel box girder 1 reaches the specified position, the pushing component 3 in the translation state will be jacked up again. On the one hand, it is convenient for the stopper 232 in the supporting state and the support member 3213 to be switched to the avoiding state. On the other hand, the final deviation correction is performed to ensure the accuracy of the placement of the steel box girder 1. The overall process is more smooth, accurate and stable when cooperating with the pushing structure 1000 for construction.

[0063] It should be noted that this construction method can be carried out manually, manually remotely controlling the activities of the pushing components, and remotely observing the steel box girder through a camera device to control the longitudinal position of the steel box girder. It can also be carried out by controlling through a controller, which is not limited here. However, it is obvious that when using a controller for control, it is more accurate and stable. At the same time, when using a controller for control, it is easy to think that travel switches need to be set at the positions where the jacking mechanism 31, the translation mechanism 32 and the deviation correction mechanism 33 have movement strokes to obtain the corresponding travel information. The specific positions and types of the travel switches are not limited here, as long as the above construction steps can be satisfied.

[0064] Specifically, the movable seat 321 includes a movable base 3211 and a floating seat 3212. The movable base 3211 is longitudinally movably installed on the jacking seat 312, and a plurality of pressing rods 3211a protrude from the top of the movable base 3211. The floating seat 3212 is installed on the movable base 3211, and an elastic support member 3214 is provided between the floating seat 3212 and the movable base 3211. Avoidance holes 3212a are formed at the positions of the bottom of the floating seat 3212 corresponding to the pressing rods 3211a. Accommodation holes 3212b extending transversely are formed on both sides of the floating seat 3212 in the transverse direction. Each accommodation hole 3212b communicates with one of the avoidance holes 3212a. A push rod 3213a passing through the accommodation hole 3212b is provided on the support member 3213. One end of the push rod 3213a is inclined with respect to one end of the pressing rod 3211a. When the jacking assembly 3 jacks up the steel box girder 1, the floating seat 3212 is pressed to compress the elastic support member 3214 to approach the movable base 3211, and the pressing rod 3211a extends into the avoidance hole 3212a to push against the push rod 3213a, so that the support member 3213 extends transversely out of the floating seat 3212. An elastic connecting member 3215 is provided between the accommodation hole 3212b and the push rod 3213a. When the pressing rod 3211a disengages from the push rod 3213a, the elastic connecting member 3215 resets the push rod 3213a so that the support member 3213 contracts into the floating seat 3212. The support seat 331 is installed on the floating seat 3212. The stopper 232 is movably arranged on the support column 23, so that there are an avoidance state in which the stopper 232 avoids the support member 3213 and a support state in which the stopper 232 supports the support member 3213.To simplify the switching between the support member 3213 and the stopper 232 between the support state and the avoidance state, and at the same time stably associate the movement of the pushing component 3 with the state switching between the two, in this embodiment, the telescopic driving mode of the support member 3213 is set to be driven by the gravity of the steel box girder 1, that is, when the pushing component 3 jacks up the steel box girder 1, the pressure rod 3211a pushes against the ejector rod 3213a to laterally extend, and then drives the support member 3213 to extend out of the floating seat 3212, so as to bind the action of the pushing component 3 jacking up the steel box girder 1 with the extension of the support member 3213. Compared with setting a separate control program and a separate driving device to drive the support member 3213 to extend, this method is more accurate and reliable. And when the pushing component 3 in the translation state alternates, that is, when another pushing component 3 jacks up from the initial state to the deviation correction state, when the pushing component 3 in the translation state loses the load, the support member 3213 automatically retracts into the floating seat 3212, so that the stopper 232 and the support member 3213 are automatically switched to the avoidance state, and the pushing component 3 can directly perform the reset operation. The design is ingenious, without the need to set a separate drive, accurate, reliable and low-cost. Based on the setting of the telescopic mode of the support member 3213, considering step S3 again, when the pushing component 3 is in the translation state, that is, when the support member 3213 abuts against the stopper 232, the pushing component 3 has already jacked up the steel box girder 1, that is, when the support member 3213 is below the stopper 232, the support member 3213 has been pressed and extended by the steel box girder 1. Therefore, the stopper 232 needs to be synchronously movably arranged to avoid the already extended support member 3213 during the jacking process of the pushing component 3, so as to prevent the support member 3213 from abutting against the bottom of the stopper 232 and affecting the construction process; in addition, considering step S7, when the steel box girder 1 reaches the specified position, after the pushing component 3 jacks up again, it needs to sink to place the steel box girder 1 on the support column 23, that is, the support member 3213 needs to descend to a position lower than the stopper 232. At this time, the support member 3213 is always in the extended state, so the stopper 232 also needs to be movably arranged to meet the step of avoiding the support member 3213 at this time.

[0065] Further, the stopper 232 is rotatably mounted on the support column 23, and the stopper 232 has a support end face 232a located above and an abutting end face 232b located below. The abutting end face 232b abuts against the support column 23 so that the support end face 232a can support the support member 3213. When the support member 3213 abuts against the stopper 232 from bottom to top, the support member 3213 drives the stopper 232 to rotate to avoid the support member 3213. When the support member 3213 abuts against the stopper 232 from top to bottom, the abutting end face 232b abuts against the support column 23, and the support end face 232a supports the support member 3213. A driving member is further provided between the stopper 232 and the support column 23, and the driving member can drive the support column 23 to rotate. The way the stopper 232 is movably arranged can be to separately provide a driving member to drive the stopper 232 to support or avoid the support member 3213, and the moving mode can be translation or rotation. In this embodiment, the stopper 232 is rotatably mounted on the support column 23 and has the abutting end face 232b and the support end face 232a. Considering steps S2 to S3, when the support member 3213 abuts against the stopper 232 from bottom to top, the support member 3213 drives the stopper 232 to rotate to avoid the support member 3213, avoiding the influence on the construction process. When the support member 3213 abuts against the support end face 232a of the stopper 232 from top to bottom, the stopper 232 can abut against and support the support member 3213 to achieve its support function. The overall process does not require an additional driving member and is driven by the movement of the support member 3213, which is also more accurate, reliable and low-cost. Thus, on this basis, considering step S7, a driving member is further provided between the support column 23 and the stopper 232, and this driving member can drive the stopper 232 to rotate to avoid the support member 3213 moving from top to bottom. It can be a magnetic attraction structure arranged between the support column 23 and the stopper 232, or a rotation driving structure arranged at the rotation shaft of the stopper 232, or a traction structure arranged between the support column 23 and the stopper 232, which is not limited herein.

[0066] In addition, a limiting convex portion 233 is protruded from the supporting column 23 toward the installation area, and the stopper 232 is rotatably installed on the limiting convex portion 233. The limiting convex portion 233 is used to abut and limit the jacking height of the jacking seat 312. The provision of the limiting convex portion 233 can, on the one hand, make the stopper 232 closer to the floating seat 3212, reducing the volume of the stopper 232. On the other hand, the limiting convex portion 233 plays a role in limiting the jacking height of the jacking seat 312, providing a certain degree of protection. At least when an abnormal situation occurs, it can prevent the jacking assembly from jacking the steel box girder 1 too high, thus avoiding safety accidents.

[0067] Specifically, the vertical distance between the jacking seat 312 and the limiting convex portion 233 is H; when the support seat 331 is centered horizontally, the vertical moving distance of the pushing convex portion 332 moving upward until it abuts against the rectifying convex portion is h, and H ≤ h. With such a setting, when the jacking assembly is in the rectifying state, the pushing convex portion 332 will not tightly abut against the rectifying convex portion 231. While having a certain rectifying effect, it plays a role in protecting the rectifying convex portion 231 and prolonging its service life. Moreover, the smaller the difference between H and h, the better the rectifying effect. Based on the fact that there is a certain compression space between the floating seat 3212 and the movable base 3211 itself, in this embodiment, H is set to be equal to h, which is convenient for dimension setting and can obtain a good rectifying effect while protecting the rectifying convex portion 231.

[0068] In addition, the elastic support member 3214 includes a support spring sleeved on the pressure rod 3211a. The elastic support member 3214 can be set as an elastic member independent of the pressure rod 3211a. However, compared with setting the elastic support member 3214 as the support spring sleeved on the pressure rod 3211a, the horizontal offset of the independently set elastic member is not restricted, and there may be a situation where the offset is too large, resulting in the pressure rod 3211a being unable to extend into the avoidance hole 3212a, which is unstable and affects normal use. Therefore, in this embodiment, the elastic support member 3214 is selected as the support spring sleeved on the pressure rod 3211a.

[0069] In addition, the elastic connecting member 3215 includes a connecting spring sleeved on the ejector rod 3213a. The elastic connecting member 3215 can be set as a connecting member connecting the end of the ejector rod 3213a and the bottom of the receiving hole 3212b. However, the pressure rod 3211a needs to abut against the end of the ejector rod 3213a. This setting method poses a certain obstacle to the movement of the ejector rod 3213a driven by the pressure rod 3211a and is not convenient for setting. Therefore, in this embodiment, the elastic connecting member 3215 is set as the connecting spring sleeved on the ejector rod 3213a to avoid the above problems.

[0070] In addition, the horizontal driving device 322 includes a guiding rack 322a disposed on the lifting base 312 and a driving gear 322b disposed on the movable seat 321. The guiding rack 322a is longitudinally extended, and the driving gear 322b meshes with the guiding rack 322a to drive the longitudinal movement of the movable seat 321. The specific structure of the horizontal driving device 322 may be a push-pull device disposed between the lifting base 312 and the movable seat 321. However, compared with the structure in which the driving gear 322b and the guiding rack 322a are cooperated in this embodiment, the driving process of the above push-pull device is unstable, and the driving length is not easy to adjust, or the accuracy is poor after adjustment. The movement of the driving gear 322b on the guiding rack 322a is more stable, and the driving distance adjustment is more accurate and stable.

[0071] In addition, a receiving groove is formed at the top of the lifting base 312, and the translation mechanism 32 is installed in the receiving groove. The groove wall of the receiving groove limits the longitudinal movement distance of the translation mechanism 32. The provision of the receiving groove serves to limit the longitudinal movement of the translation mechanism 32 and to limit and protect the driving gear 322b and the guiding rack 322a.

[0072] In addition, the lifting device 311 includes a plurality of hydraulic cylinders, and a plurality of mounting holes are formed on the support platform 22. One of the hydraulic cylinders is embedded in one of the mounting holes. The lifting device 311 may be set as hydraulic lifting, mechanical transmission lifting, etc. However, in this application, the mass of the steel box girder 1 is generally large. Setting it as the hydraulic cylinder with stronger bearing capacity and more mature technology is more stable and has lower cost. At the same time, to improve the lifting stability of the hydraulic cylinder, the hydraulic cylinder is fixed by forming the mounting holes on the support platform 22 and embedding the hydraulic cylinder into the mounting holes.

[0073] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A jacking structure, characterized in that, include: A steel box girder is longitudinally extended, and a longitudinally extending correcting beam is protruded from the lower surface of the steel box girder; A temporary pier, comprising a pier column and a support platform provided at the top of the pier column, wherein the top of the support platform is provided with two support columns spaced laterally apart, the two support columns being used to support the steel box girder, and the two support columns defining an installation area therebetween, the correcting beam corresponding to the installation area; as well as, Base comprises support, castor, and frame upper is provided with guide rail, and support and conveyer frames movable end contact site are provided with recoil spring, and castor is arranged on the pin of base bottom four, to carry mobile handler location. The correcting structure includes two correcting protrusions convexly provided on opposite side surfaces of the two support columns and two resisting protrusions convexly provided on both lateral ends of the support seat, and at least one of the two end surfaces of the resisting protrusions opposite to the correcting protrusions is inclined so that during the upward lifting process of the jacking mechanism, the correcting beam first extends into the limiting groove along the guide portion, and then the resisting protrusions are held against the correcting protrusions and slide laterally, thereby driving the support seat to move laterally and driving the steel box beam to move laterally to correct the deviation; The support column is provided with a stopper extending into the installation area at a position corresponding to the movable seat, and a corresponding support member is provided on the movable seat. At least one of the support member and the stopper is movably arranged so as to have a supporting state in which the stopper abuts against the bottom of the support member to support the movable seat, and a avoiding state in which the stopper avoids the support member. When the stopper and the support member are in the supporting state, the height of the steel box girder lifted by the jacking assembly is fixed; Wherein, the movable seat comprises: A movable base is longitudinally movable and mounted on the lifting seat, and a plurality of pressure rods are protruded from the top of the movable base; The floating seat is installed on the movable base, and an elastic support member is provided between the floating seat and the movable base. An avoidance hole is provided at the bottom of the floating seat corresponding to the position of the pressing rod. Accommodation holes extending laterally are provided on both sides of the floating seat in the lateral direction. Each accommodation hole communicates with one of the avoidance holes. A top rod passing through the accommodation hole is provided on the support member. One of the end portions of the top rod and the end portion of the pressing rod are inclined, so that when the steel box girder is lifted by the jacking assembly, the floating seat is pressed to compress the elastic support member to approach the movable base, and the pressing rod extends into the avoidance hole to push against the top rod, so that the support member extends laterally out of the floating seat; An elastic connecting member is provided between the accommodation hole and the top rod, so that when the pressing rod disengages from the top rod, the elastic connecting member resets the top rod so that the support member contracts into the floating seat; The support seat is installed on the floating seat; The stopper is movably arranged on the support column, so that there is an avoidance state in which the stopper avoids the support member and a support state in which the stopper supports the support member.

2. The pushing structure according to claim 1, characterized in that, The stopper is rotatably installed on the support column, and the stopper has a support end face located above and a butt end face located below. The butt end face abuts against the support column so that the support end face can support the support member. When the support member moves upward and downward against the stopper, the stopper is driven to rotate to avoid the support member. When the support member moves downward and upward against the stopper, the butt end face abuts against the support column, and the support end face supports the support member; A driving member is further provided between the stopper and the support column, and the driving member can drive the support column to rotate.

3. The pushing structure according to claim 2, characterized in that, The support column protrudes towards the installation area with a limiting convex portion, and the stopper is rotatably installed on the limiting convex portion, and the limiting convex portion is used to abut and limit the jacking height of the jacking seat.

4. The pushing structure according to claim 3, characterized in that, The vertical distance between the jacking seat and the limiting convex portion is H; When the support seat is centered laterally, the upward moving distance of the pushing convex portion until it abuts against the rectifying convex portion is h, then H ≤ h.

5. The pushing structure according to claim 1, characterized in that, The elastic support member includes a support spring sleeved on the pressing rod; and / or, The elastic connecting member includes a connecting spring sleeved on the top rod.

6. The pushing structure according to claim 1, characterized in that, The horizontal driving device includes a guiding rack provided on the jacking seat and a driving gear provided on the movable seat. The guiding rack extends longitudinally, and the driving gear meshes with the guiding rack to drive the movable seat to move longitudinally.

7. The pushing structure according to claim 1, characterized in that A receiving groove is provided at the top of the jacking seat, and the translation mechanism is installed in the receiving groove. The groove wall of the receiving groove limits the longitudinal moving distance of the translation mechanism.

8. The pushing structure according to claim 1, wherein The jacking device includes a plurality of hydraulic cylinders. A plurality of installation holes are provided on the support platform, and one hydraulic cylinder is embedded in one installation hole.

9. A method for launching and pushing construction of a steel box girder based on the launching and pushing structure according to any one of claims 1 to 8, characterized in that, Two temporary piers are arranged at longitudinal intervals or two jacking assemblies are arranged at longitudinal intervals on one temporary pier. The steps of the construction method for jacking the steel box girder include: S1: Reset the two jacking assemblies to the initial state; S2: The lifting mechanism in any one of the pushing assemblies is lifted upward. During the lifting process, the correcting beam on the steel box girder is first extended into the limiting groove along the guide portion, and then the support seat abuts against the bottom of the steel box girder and lifts it until the abutting protrusion on the support seat cooperates with the correcting protrusion to complete the lateral correction of the steel box girder. At this time, the pushing assembly is in a correcting state. S3: the lifting mechanism in the pushing assembly in the deviation-correcting state sinks, and the supporting member in the supporting state abuts against the stop member to fix the height of the steel box girder lifted by the pushing assembly. At this time, the pushing assembly is in a translation state; S4: The translation mechanism in the pushing assembly in the translation state translates to drive the steel box girder to move forward longitudinally by a set distance, and determines whether the steel box girder reaches a specified position; S5: If the steel box girder has not reached the designated position, the lifting mechanism in the jacking assembly in the initial state is lifted upward until the jacking assembly enters the deviation correction state; At this time, the pushing assembly in the translation state loses its load, the support member and the stop member switch to the avoidance state, and the pushing assembly returns to the initial state; S6: After completing step S5, execute step S3; or, S7: If the steel box girder reaches the specified position, the lifting mechanism in the pushing assembly in the translation state is lifted upward until the pushing assembly enters the correction state to perform the correction operation again, the support member and the stop member are switched to the avoidance state, and then the lifting mechanism sinks until the steel box girder is placed on the support column, and the pushing assembly is reset to the initial state.

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