LU502085B1 - Intelligent bridge synchronous jacking system and method for high-speed railway - Google Patents

Abstract

The present invention provides an intelligent bridge synchronous jacking system and a method for high-speed railway. In the system, the jacking unit is provided with multiple sets, which are symmetrically distributed at multiple preset vertices of the bridge for synchronous jacking operation of the bridge; wherein the jacking unit keeps the preset fixed constraint, the preset transverse constraint and the preset longitudinal constraint imposed on the bridge when synchronously jacking the bridge; a base plate is arranged between the jacking unit and the preset point, an upper sliding layer is arranged between the upper end of the jacking unit and the base plate, the lower end of the jacking unit is located on the temporary support of the bridge, and a lower sliding layer is arranged between the lower end of the jacking unit and the temporary support; the monitoring feedback unit is provided with multiple, and multiple monitoring feedback units are correspondingly arranged at multiple preset vertexes corresponding to the multiple sets of jacking units; and the control unit is electrically connected with the plurality of monitoring feedback units and independently controls the corresponding jacking units, so that the multiple sets of jacking units can act synchronously.

Description

BL-5500 ' LU502085

INTELLIGENT BRIDGE SYNCHRONOUS JACKING SYSTEM AND METHOD FOR HIGH-SPEED RAILWAY

BACKGROUND Field of Invention The present invention relates to the technical field of high-speed railway bridge construction, in particular relates to an intelligent bridge synchronous jacking system and method for high-speed railway. Background of the Invention The high-speed railway is used as an efficient and fast transportation mode, the traffic distance between the cities is shortened, and in the construction of the high-speed railway, the erection of the bridge in the high-speed railway is an important key link. Under normal circumstances, the installation of the bridge of the high-speed railway adopts an integral multi-point pushing mode, an independent jack for bridge pushing is arranged on the bridge pier (or the temporary bridge pier) for jacking construction of the bridge, the four stress points are required to be stressed uniformly in the bridge erecting process, the errors between each other cannot exceed 5 mm, and otherwise, the bridge is cracked. At present, the displacement of each vertex is independently monitored, and synchronous jacking is carried out on the bridge by adopting on-site unified command and multi-person independent topping method. The construction method has the disadvantages that the number of operators is large, and unified command coordination is difficult during jacking; and the jacking is synchronized to the manual reading instrument at each vertex, the synchronization deviation is large, and the bridge can be damaged slightly.

BL-5500 LU502085

SUMMARY The present invention aims to provide an intelligent bridge synchronous jacking system and method for the high-speed railway, so as to solve or alleviate the problems existing in the prior art.

In order to achieve the above purpose, the present application provides the following technical solutions: The present invention provides an intelligent bridge synchronous jacking system for high-speed railway, comprising: a jacking unit, a control unit and a monitoring feedback unit; the jacking unit is provided with multiple sets, which are symmetrically distributed at multiple preset vertices of the bridge for synchronous jacking operation of the bridge; wherein the jacking unit keeps the preset fixed constraint, the preset transverse constraint and the preset longitudinal constraint imposed on the bridge when synchronously jacking the bridge; a base plate is arranged between the jacking unit and the preset point, an upper sliding layer is arranged between the upper end of the jacking unit and the base plate, the lower end of the jacking unit is located on the temporary support of the bridge, and a lower sliding layer is arranged between the lower end of the jacking unit and the temporary support; the monitoring feedback unit is provided with multiple, and multiple monitoring feedback units are correspondingly arranged at multiple preset vertexes corresponding to the multiple sets of jacking units, and which are used to monitor the jacking displacement of the bridge in real time; the control unit is electrically connected with multiple monitoring feedback units, which is used to independently control the corresponding jacking units according to the jacking displacement of the bridge sent by the received monitoring feedback unit. Multiple sets of jacking units act synchronously, so that the mutual error of jacking position shift at multiple preset vertices is not greater than the preset threshold.

The present invention provides an intelligent bridge synchronous jacking method for high-speed railway, the intelligent bridge synchronous jacking system for high- speed railway 1s used to jack the bridge, comprising: step S101, jacking equipment and bridge pretreatment; step S102: determining a plurality of preset vertices of the bridge,

BL-5500 ’ LU502085 and installing a jacking unit and a monitoring feedback unit at the preset vertices; step S103: debugging the jacking unit; step S104: carrying out a trial jacking test on the bridge, wherein the trial jacking height is 1 mm; step S105: carrying out formal jacking of the bridge: according to the bridge jacking displacement sent by the monitoring feedback unit, controlling multiple sets of jacking units to act synchronously, so that the mutual error of jacking displacement at multiple preset vertices is not greater than the preset threshold.

Beneficial effects The technical scheme for synchronous jacking of intelligent bridge for high-speed railway provided by the present application, on the one hand, multiple sets of jacking units are arranged at multiple preset points of the bridge, and at the same time, a monitoring feedback unit matched with the jacking unit is arranged at a preset vertex; according to the jacking displacement in the process of bridge jacking monitored by the monitoring feedback unit, the control unit independently controls the corresponding jacking units to synchronize the actions of multiple sets of jacking units, so as to avoid the danger and possible damage to the bridge caused by the mutual error of the jacking displacement at the preset vertex when the jacking unit is jacking the bridge; on the other hand, a base plate is arranged between the jacking unit and the preset vertex, and the jacking force of the jacking unit is uniformly distributed on the beam body of the bridge, so as to prevent the local stress of the concrete at the bottom of the beam body and the pier top of the bridge from being too large and avoid the local crushing of the concrete at the bottom of the beam body and the pier top; according to the preset fixed constraint on the bridge in the jacking process, the preset transverse constraint and the preset longitudinal constraint, the beam body of the bridge cannot be offset in the jacking process, at the same time, an upper sliding layer and a lower sliding layer are respectively arranged between the jacking unit and the base plate and the temporary supporting of the bridge respectively, so that the beam body of the bridge can still move freely during replacement of the support.

BL-5500 LU502085

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural diagram of an intelligent bridge synchronous jacking system for high-speed railway; Fig. 2 is a schematic structural diagram of a jacking device; Fig. 3 is a front view of the jacking device shown in Fig. 2; Fig. 4 is a B-direction view of the jacking device shown in Fig. 3; Fig. 5 is a top view of the jacking device shown in Fig. 3; Fig. 6 is a view of A-A in the jacking device shown in Fig. 5; Fig. 7 is a B-B view of the jacking device shown in Fig. 5; Fig. 8 is a schematic structural diagram of a sliding support; Fig. 9 is a flow diagram of an intelligent bridge synchronous jacking method for high-speed railway.

Description of the figures: 101, jacking unit; 102, monitoring feedback unit; 103, control unit; 104, hydraulic pump station; 201, first transverse jacking jack; 202, second transverse jacking jack; 203, longitudinal jacking jack; 204, fixed base; 205, first sliding base; 206, second sliding base; 801, fixing support part; 802, sliding support part; 803, threaded pull rod.

DETAILED DESCRIPTION OF THE EMBODIMENTS The bridge jacking adopts the computer control (control unit 103) and the multi- point displacement synchronous jacking of the sub pump unit (jacking unit 101) of the bridge, the digital monitoring transmission (monitoring feedback unit 102), hydraulic transmission control and computer digital signal processing are combined to effectively solve the problem of beam displacement synchronization and control in the jacking process of the bridge superstructure, it effectively avoids the additional secondary internal force of the bridge superstructure in the longitudinal and transverse directions caused by the vertical displacement difference of each fulcrum in the jacking process of the bridge superstructure, and effectively eliminates the change of the actual internal

BL-5500 ) LU502085 force of the bridge superstructure, so as to ensure the structural safety of the bridge superstructure.

As shown in Fig. 1 to 8, the intelligent bridge synchronous jacking system for high-speed railway comprises a Jacking unit 101, a control unit 103 and a monitoring feedback unit 102; the jacking unit 101 is provided with multiple sets, which are symmetrically distributed at multiple preset vertices of the bridge for synchronous jacking operation of the bridge; wherein the jacking unit 101 keeps the preset fixed constraint, the preset transverse constraint and the preset longitudinal constraint imposed on the bridge when synchronously jacking the bridge; a base plate is arranged between the jacking unit 101 and the preset point, an upper sliding layer is arranged between the upper end of the jacking unit 101 and the base plate, the lower end of the jacking unit 101 is located on the temporary support of the bridge, and a lower sliding layer is arranged between the lower end of the jacking unit 101 and the temporary support; the monitoring feedback unit 102 is provided with multiple, and multiple monitoring feedback units 102 are correspondingly arranged at multiple preset vertexes corresponding to multiple sets of jacking units 101, and which are used to monitor the jacking displacement of the bridge in real time; the control unit 103 is electrically connected with the plurality of monitoring feedback units, which is used to independently control the corresponding jacking units according to the jacking displacement of the bridge sent by the received monitoring feedback unit 102, multiple sets of jacking units act synchronously, so that the mutual error of jacking position shift at multiple preset vertices is not greater than the preset threshold.

When the jacking unit 101 carries out the synchronous jacking operation on the bridge, it keeps the preset fixed constraints, preset transverse constraints and preset longitudinal constraints imposed on the bridge, that is, when the jacking unit 101 carries out the synchronous jacking operation on the bridge, the preset fixed constraints, preset transverse constraints and preset longitudinal constraints imposed on the bridge will not be released.

BL-5500 LU502085 The jacking height of the bridge is [5,8] mm, and the jacking unit 101 is symmetrically and evenly distributed at multiple preset vertices of the bridge, specifically, the preset vertices are located on the beam body and pier top of the bridge, the symmetrical arrangement of the jacking unit 101 is conducive to the reasonable stress of the beam body; at the same time, in order to avoid the absence of distributed reinforcement and other structures at the preset apex of the beam body, an integral stress distribution base plate is arranged at the preset vertex of the beam bottom and pier top to contact with the jacking unit 101, so as to evenly act the jacking force of the jacking unit 101 on the beam body, prevent the local stress of the beam bottom and pier top concrete of the bridge from being too large, and avoid the local crushing of the beam bottom and pier top concrete.

The preset fixed constraint, the preset transverse constraint, the preset longitudinal constraint and other constraint relationships are respectively applied between the upper and lower base plate of the bridge, the transverse support and the vertical seat of the longitudinal support, and in the jacking process, the preset fixed constraint, the preset transverse constraint and the preset longitudinal constraint are not released, so as to effectively ensure that the beam body of the bridge does not offset in the jacking process; and the lower sliding layer and the upper sliding layer are arranged between the jacking unit 101 and the temporary support of the bridge, so that the beam body of the bridge can still be freely movable during replacement of the support (the fixed support, the transverse support, the longitudinal support and so on). Specifically, the upper sliding layer and the lower sliding layer are made of 3 mm thick polytetrafluoroethylene plate. Furthermore, the temporary support adopts steel cushion blocks welded with channel steel.

The monitoring and feedback unit 102 is matched with the jacking unit 101 at the preset vertex, during the jacking process of the bridge beam, the jacking displacement at the corresponding preset vertex is monitored in real time and fed back to the control unit 103; according to the jacking displacement of the bridge sent by the received monitoring feedback unit 102, the control unit 103 independently controls the

BL-5500 LU502085 corresponding jacking unit 101 to realize the synchronous action of multiple groups of jacking units 101, so as to ensure the mutual error of jacking position shift at multiple preset vertices 1s not greater than the preset threshold, and further avoid the large mutual error of the jacking displacement at the preset vertices when the jacking unit 101 jacking the bridge, which may bring danger and damage to the bridge.

The control unit 103 adopts a programmable logic controller (PLC), and the jacking unit 101 is driven by the hydraulic pump station 104, so that a PLC multi-point synchronous jacking is formed between the PLC and the jacking unit 101, hydraulic jacking, displacement monitoring and bridge construction are integrated, and the oil quantity control information of the hydraulic pump station 104 is output according to the displacement signal sent by the monitoring feedback unit 102 during bridge jacking. Specifically, in the hydraulic pump station 104, the hydraulic pump station 104 uses a switch valve to control the flow (the flow rate is changed by adjusting the switch frequency of the on-off valves), so that the output flow of the oil pump of the hydraulic pump station 104 is continuously adjustable; at the same time, closed-loop control between the pressure of the hydraulic pump station 104 and the jacking displacement is formed through jacking displacement feedback and point position detection, jacking synchronization and load balancing of the jacking unit 101 are accurately controlled, and the displacement synchronization precision of the bridge in the jacking process is effectively ensured to be located between [ -0.5 mm and 0.5 mm ].

Due to the certain flatness difference of the beam bottom surface of the bridge, the control system is provided with synchronous zero points of multiple sets of jacking units 101, so as to ensure the load balance of the jacking unit 101 during jacking. Specifically, before the synchronous jacking of the bridge, the hydraulic pump station 104 is started, so that the multiple sets of jacking units 101 simultaneously rise, and once the jacking unit 101 contacts the top jacking surface (the bottom surface of the bridge), the jacking unit 101 is controlled to stop rising, and at the same time, the other jacking units 101 continue to rise until all the jacking units 101 are in contact with the jacking surface; then the hydraulic pump station 104 is pressurized until the pressure of

BL-5500 LU502085 each set of jacking units 101 reaches 5 Mpa, which is used as the synchronous zero point of the plurality of sets of jacking units 101, further, the zero pressure of each set of control units 103 is separately arranged in the PLC as the synchronous zero point of the plurality of sets of jacking units 101.

The hydraulic pump station 104 adopts a plunger pump, a bidirectional stop valve is installed above the hydraulic pump station 104, and the jacking unit 101 is locked without leakage by the bidirectional stop valve, so as to ensure that the jacking unit 101 does not slide down under emergency conditions such as accidental power failure; at the same time, the jacking unit 101 is equipped with a pressure monitoring device and a displacement monitoring device, and when the jacking unit 101 moves, the pressure monitoring device accurately measures the load of the jacking unit 101 in real time, and the displacement monitoring device accurately measures the real-time jacking displacement height of the jacking unit 101. Specifically, the pressure monitoring device and the displacement monitoring device can adopt external (or built-in) pressure and displacement sensors; at the same time, a load-equalizing valve is further arranged in the hydraulic pump station 104, so as to protect the jacking units 101 from overload and effectively avoid cylinder expansion accidents of the jacking units 101. The precision of the pressure sensor is 0.2%, and the resolution of the displacement sensor is 0.004 mm.

The control unit 103 adopts a programmable logic controller, and the monitoring feedback unit 102 of each jacking unit 101 sends the monitored load (pressure) signal and the displacement signal to the programmable logic controller. The programmable logic controller controls the hydraulic pump station 104, the driving valve group and the output pressure oil according to the load signal and the displacement signal, so that the corresponding jacking unit 101 acts; and in the jacking process, the programmable logic controller continuously corrects the motion error of the plurality of sets of jacking units 101 according to the real-time pressure signal and the real-time displacement signal sent by the monitoring feedback unit 102, so as to ensure the load synchronization balance of the multiple sets of jacking units 101.

BL-5500 LU502085 Each set of jacking units 101 comprises multiple jacking devices, and the plurality of jacking devices are arranged in a linear arrangement or a zigzag arrangement at each preset vertex. Specifically, multiple jacking devices at each preset vertex share an integral stress distribution base plate, an upper sliding layer is arranged between the base plate and each jacking device, and a lower sliding layer is arranged between each jacking device and the temporary support, each jacking device is equipped with a displacement monitoring device and a pressure monitoring device, and multiple jacking devices in each set of jacking units 101 are connected in parallel and can be independently controlled through a programmable logic controller.

Further, the jacking device comprises a first transverse jacking jack 201, a second transverse jacking jack 202 and a longitudinal jacking jack 203, the first transverse jacking jack 201, the second transverse jacking jack 202 and the longitudinal jacking jack 203 are arranged perpendicular to each other, and the telescopic axis is intersected with one point; wherein the first transverse jacking jack 201 and the second transverse jacking jack 202 are located in the same horizontal plane, which are respectively used for adjusting the transverse displacement of the first direction and the second direction of the bridge, and the longitudinal jack is used for adjusting the longitudinal displacement of the bridge; and the first direction is the length direction of the bridge, and the second direction is the width direction of the bridge.

In the process of bridge beam jacking, the displacement of the bridge in the length direction, the width direction and the height direction is adjusted through the first transverse jacking jack 201, the second transverse jacking jack 202 and the longitudinal jacking jack 203 which are arranged perpendicular to each other and intersect with each other, so as to achieve the accurate control of bridge jacking. Further, the first transverse jacking jack 201, the second transverse jacking jack 202 and the longitudinal jacking jack 203 are arranged in parallel, and which are respectively provided with a displacement sensing device and a pressure sensing device, so that the programmable logic controller independently controls the first transverse jacking jack 201, the second

BL-5500 LU502085 transverse jacking jack 202 and the longitudinal jacking jack 203, so as to achieve the multi-directional, flexible and precise control in the process of bridge girder jacking.

The jacking device further comprises a fixed base 204, a first sliding base 205 and a second sliding base 206; the first sliding base 205 is located on the fixed base 204 and can move in the first direction on the fixed base 204; the second sliding base 206 is located on the first sliding base 205 and can move along the first direction along with the first sliding base 205, and the second sliding base 205 can move in the second direction on the first sliding base 205; correspondingly, the fixing part of the first transverse jacking jack 201 is fixedly installed on the side wall of the fixed base 204, and the telescopic part of the first transverse jacking jack 201 is fixedly connected with the first side wall of the first sliding base 205; the fixing part of the second transverse jacking jack 202 is fixedly installed on the second side wall of the first sliding base 205, and the telescopic part of the second transverse jacking jack 202 is fixedly connected with the side wall of the second sliding base 206; wherein the second side wall is perpendicular to the first side wall; and the longitudinal jacking jack 203 is located on the bottom plate of the second sliding base 206.

Further, the lower surface of the bottom plate of the first sliding base 205 is provided with a first groove, and the first sliding block is fixedly installed in the first groove; correspondingly, the fixed base 204 is provided with a first slide rail along the first direction, and the first slide rail is matched with the first sliding block; correspondingly, the lower surface of the bottom plate of the second sliding base 206 is provided with a second groove, a second sliding block is fixedly installed in the second groove, and the second sliding block is matched with the second sliding rail.

The fixed base 204 at least comprises a side wall and a bottom plate, the side wall and the bottom plate are perpendicular to each other and are fixedly connected, a first sliding rail is arranged on the upper surface of the bottom plate in the first direction, and the extending direction of the first sliding rail is perpendicular to the side wall. A fixing part of the first transverse jacking jack 201 is fixedly installed on the side wall,

BL-5500 LU502085 and specifically, connected through a flange, the telescopic part of the first transverse jacking jack 201 is telescopically moved in the extending direction of the first rail, and the telescopic end of the first transverse jacking jack 201 is fixedly connected with the first side wall of the first sliding base 205, so that the first sliding base 205 moves in the first direction through the cooperation of the first sliding block and the first sliding rail arranged on the bottom plate of the first sliding base 205. Further, the lower surface of the bottom plate of the first sliding base 205 is provided with a first groove, thereby reducing the height of the first sliding base 205, reducing the gap between the first sliding base 205 and the fixed base 204, so as to improve the stability of the first sliding base 205 when moving in the first direction.

The upper surface of the bottom plate of the first sliding base 205 is provided with a second sliding rail moving in the second direction, the fixing part of the second transverse jacking jack 202 is fixedly installed on the second side wall perpendicular to the first side wall on the first sliding base 205, the telescopic part of the second transverse jacking jack 202 is telescopically moved in the extending direction of the second rail, and the telescopic end of the second transverse jacking jack 202 is fixedly connected with the side part of the second sliding base 206, so as to drive the second sliding base 206 to move telescopically in the second direction through the cooperation of the second sliding block and the second sliding rail arranged on the bottom plate.

Further, the lower surface of the bottom plate of the second sliding base 206 is provided with a second groove, and the second sliding block is fixedly installed in the second groove, thereby reducing the height of the second sliding base 206, reducing the gap between the second sliding base 206 and the first sliding base 205, so as to improve the stability of the second sliding base 206 when moving in the second direction.

A first limiting baffle is arranged on two opposite side surfaces of the fixed base 204, the first limiting baffle is perpendicular to the side wall of the fixed base 204, which are used for limiting displacement of the first sliding base 205 in the second direction, so as to improve the movement control precision in the bridge jacking process; a second limiting baffle is arranged on the first sliding base 205, the second limiting

BL-5500 LU502085 baffle is parallel to the second side wall, which are used for limit the displacement of the second sliding base 206 in the first direction, so as to further improve the control accuracy in the bridge jacking process. Furthermore, multiple first limiting baffles are distributed in the first direction, and multiple first limiting baffles are uniformly distributed along the first sliding rails; and multiple second limiting baffles are distributed in the second direction, and multiple second limiting baffles are uniformly distributed along the second sliding rails. Therefore, so as to improve the first sliding base 205 moves in the first direction and the second sliding base 206 moves in the second direction.

The longitudinal jacking jack 203 is located on the bottom plate of the second sliding base 206, and under the driving of the second transverse jacking jack 202, the longitudinal jacking jack 203 moves along the second sliding rail along with the second sliding base 206 in the second direction. Specifically, the fixing part of the longitudinal jacking jack 203 is integrally formed with the bottom plate of the second sliding base

206. Therefore, the structure of the jacking device is more compact, and the jacking device can be used in a more narrow space.

Between the first sliding rail and the first sliding rail, and between the second sliding rail and the second sliding rail, a plurality of slide rail sliders arranged in parallel can be matched, so as to ensure the movement precision of the first sliding base 205 and the second sliding base 206 in the first direction and the second direction respectively; when two sliding rail sliding blocks arranged in parallel are adopted between the first sliding rail and the first sliding rail and/or between the second sliding rail and the second sliding rail, wherein the cross section of one sliding rail and the sliding block is triangular, so as to ensure that the first slide base 205 and/or the second slide base 206 can be aligned automatically after working for a long time, and the first sliding base 205 and the second sliding base 206 are ensured to move in the first direction and the second direction respectively.

The cross section between the first sliding rail and the first sliding rail and/or the cross section between the second sliding rail and the second sliding rail adopts a

BL-5500 LU502085 dovetail groove type, so as to ensure that the first slide base 205 and/or the second slide base 206 can be aligned automatically after working for a long time, and the first sliding base 205 and the second sliding base 206 are ensured to move in the first direction and the second direction respectively.

The intelligent bridge synchronous jacking system for the high-speed railway further comprises a sliding support, wherein the sliding support comprises a fixing support part 801 and a sliding support part 802 which can slide relative to each other, and the upper surface of the fixing support part 801 and the lower surface of the sliding support part 802 are sliding matching surfaces, both of which are offset surfaces; and the lower surface of the fixing support part 801 and the upper surface of the sliding support part 802 are always parallel. Further, the side face of the fixing support part 801 is provided with a fixed pull plate, and the fixing pull plate is provided with a U-shaped opening; the side of the sliding support part 802 corresponding to the fixed pull plate is provided with a threaded hole; the sliding support further comprises a threaded pull rod 803, one end of the threaded pull rod 803 is rotatably installed in the U-shaped opening, the other end of the threaded pull rod 803 is fixedly connected into the threaded hole, and the threaded pull rod 803 can rotate in the U-shaped opening, so as to drive the sliding support part 802 to move along the sliding matching surface.

The sliding support supports the bridge in the jacking process, and cooperates with the jacking unit 101 to realize the support of bridge jacking. Specifically, with the action of the jacking unit 101, the threaded pull rod 803 of the sliding support rotates to drive the sliding support part 802 to move on the fixing support part 801 along the sliding matching surface, so that the sliding support part 802 is always in contact with the lower surface of the bridge, specifically with the base plate, thus forming an effective support for the bridge, so as to avoid the sudden falling of the bridge in case of emergency.

The beam body of the bridge can also be locked before jacking through the sliding support, so as to prevent the horizontal displacement of the beam body in the jacking process. Specifically, in the longitudinal bridge direction, the sliding support is used to match the steel plate to lock the beam joint, so as to prevent longitudinal bridge sliding

BL-5500 LU502085 of the beam body; in the transverse bridge direction, two wedge-shaped plates are used to lock with the anti-falling beam device, so as to prevent the transverse bridge direction sliding of the beam body.

The relative sliding friction coefficient between the sliding support part 802 and the fixing support part 801 is 0.1; the sliding support part 802 and the fixing support part 801 are supported by a stainless steel material, and the sliding mating surface is coated with polytetrafluoroethylene.

The bearing capacity of each sliding support is designed to be 500 tons, the maximum working pressure is 250 tons, and the specific pressure in the working state is 16.45 MPa.

In order to ensure the coefficient of friction between the sliding support part 802 and the fixing support part 801, the mutual contact area between the sliding support part 802 and the fixing support part 801 is effectively controlled.

Specifically, a wedge- shaped plate is respectively arranged on two opposite sides of the fixing support part 801 perpendicular to the fixed pull plate, the end face of the wedge-shaped plate is welded to the fixed pull plate, and the upper surface of the wedge-shaped plate is a sliding mating surface inclined upwards towards the fixed pull plate; and the lower surface of the sliding support part 802 is a sliding mating surface matched with the upper surface of the wedge-shaped plate.

At the same time, a U-shaped groove is arranged in the upper end face of the sliding support part 802, and the threaded hole penetrates through the bottom surface of the U-shaped groove.

Therefore, after the threaded pull rod 803 passes through the threaded hole, a fixing bolt is arranged at the end part of the threaded pull rod 803, so that the sliding support part 802 cannot be separated from the threaded pull rod 803 in the sliding process.

The monitoring feedback unit comprises a stay wire sensor and a level meter, the pull line sensors are provided with multiple, wherein multiple stay wire sensors are correspondingly arranged at multiple preset vertexes, and which are used to monitor the jacking displacement at a preset vertex in real time and sending the jacking displacement to the control unit 103; and the level meter is fixedly installed on the sliding support for monitoring the horizontal state of the sliding support in real time.

BL-5500 LU502085 The level meter is installed on the sliding support, so that the sliding support is adjusted manually according to the level state monitored by the level meter. Therefore, it should be noted that the specification of the level meter is ¢79 mm * 15 mm * 15 mm, the level adopts aluminum support, and the level of the level is 20 second/2 mm. In addition, the laser level monitoring can be installed at the sliding support to monitor the change of the bridge pier during bridge jacking, and observe whether the bridge pier is settled or not in real time, which can cooperate with the jacking of the bridge, so as to improve the control accuracy during bridge jacking. The fixed end of the stay wire sensor is arranged on the top surface of the supporting pad stone, and the pull wire end is fixed to the bottom of the bridge. Therefore, the jacking height of the bridge is collected separately in real time through the stay wire sensor, which is mutual verified with the monitoring displacement of the jack displacement, so as to realize the multi-angle, omni-directional and multi-form monitoring and control of the on-site hydraulic system and bridge jacking. Here, it should be noted that the accuracy of the pull wire sensor is 0.2 mm, the working medium temperature is [-40°C, 85°C], the material is stainless steel pressure resistant outer tube, with [P67 waterproof and dust-proof grade, 24 volt (V) DC voltage (DC) power supply, and the output signal is [4,20] mA electrical signal.

After the control unit 103 amplifies the displacement signal and performs analog- to-digital conversion, the control signal is output to the electromagnetic valve of the hydraulic pump station 104, and the corresponding jack is driven to complete the corresponding action. Therefore, it should be noted that the whole control process is based on a PLC, and the control of the jacking unit 101 is achieved by means of pressure control and/or displacement control. Specifically, the pressure control and/or displacement control adopts a closed-loop control structure and a PID control algorithm, and the flow size is controlled by adjusting the rotating speed of the variable-frequency hydraulic pump in the hydraulic pump station 104; accurate loading of the jack is realized by utilizing the on and off of the high-pressure valve group, and the high- pressure stop valve matched with the jack is utilized to realize separation of the jack

BL-5500 LU502085 and the hydraulic pump station 104, which can continue to maintain stable and reliable pressure.

The tonnage of the first transverse jacking jack 201 and the second transverse jacking jack 202 is 60 tons, the working pressure is 63 Mpa, the stroke is 160 mm, the tonnage of the longitudinal jacking jack 203 is 500 tons, the working pressure is 63 Mpa, and the stroke is 150 mm.

In some alternative embodiments, the control unit 103 controls 4xN groups of symmetrically distributed jacking units 101 to act synchronously according to the received jacking displacement of the bridge sent by the monitoring feedback unit 102, so that the synchronous accuracy of the jacking displacement at 4xN preset vertices symmetrically distributed is less than or equal to +0.1mm; wherein N is a positive integer.

The synchronous control of multi-point jacking unit 101 is realized through PLC, which effectively solves the problem of beam displacement synchronization and control in the jacking process of bridge superstructure, avoids the occurrence of additional secondary internal forces in the longitudinal and transverse directions of bridge superstructure caused by the vertical displacement difference of each fulcrum in the jacking process of bridge superstructure, and effectively eliminates the change of actual internal forces of bridge superstructure, so as to ensure the structural safety of the bridge superstructure. Here, it should be noted that the number of points synchronously controlled by PLC for the jacking unit 101 is increased by a multiple 4, so as to ensure the uniform stress at each vertex of the bridge and the displacement synchronization accuracy of the multi-point jacking unit 101 is less than or equal to +0.1 mm.

The control unit 103 receives the pressure signal and the displacement signal sent by the pressure monitoring feedback unit 102, performs synchronous display on the fault state, the connection state, the displacement information, the pressure information and the like of the jacking unit 101 at each preset vertex through the display, processes the pressure signal and the displacement signal, and performs graphical display on the relationship between the pressure and the displacement in the bridge jacking process.;

BL-5500 LU502085 the closed-loop automatic control of pressure and/or displacement is used to realize the control of the whole jacking system and complete the jacking, deviation correction and adjustment of the bridge, the whole jacking process is automatically completed by the system, which eliminates the influence of human factors in the process of bridge jacking and improves the synchronization accuracy and construction quality.

The video acquisition unit can also be set to collect the video of the bridge jacking process and visually display the bridge jacking process.

As shown in Fig. 9, the intelligent bridge synchronous jacking method for high- speed railway adopts the intelligent bridge synchronous jacking system for high-speed railway of any of the above embodiments to jack the bridge, comprising: Step S101, jacking equipment and bridge pretreatment; wherein the pretreatment of jacking device comprises: detecting the jacking unit 101 in the intelligent bridge synchronous jacking system for the high-speed railway, wherein the straightness of the piston rod of the jacking unit 101 is not greater than 2%, the straightness of the piston cavity of the jacking unit 101 is not greater than 0.5%, the roundness and cylindricity of the piston cavity is not larger than 2% of its nominal diameter, and the minimum starting pressure of the cavity of the piston rod and the piston cavity is not more than 3.5 Mpa and 7.5Mpa respectively; during the full stroke of the jacking unit 101, the jacking unit 101 shall be loaded axially at 150% of its rated working pressure for 5 minutes; and the jacking unit 101 is subjected to a pressure maintaining test for 2 hours at a preset jacking force [ 70%, 90% ].

The jacking equipment is a jack, and the defects such as burrs, before the jacking operation, ensure that the burrs, iron filings, oil stains, on the surface of all parts of the jack are removed; the outer surface of the jack is free of corrosion, exfoliated oxide skin, pits and other defects; and the paint surface of the jack (except the outer surface of the piston rod) shall be uniformly sprayed, firmly combined, free of leakage or sagging.

Through the detection of the straightness of the jack piston rod, the straightness of the piston cavity, the roundness of the piston cavity and the cylindricity of the piston

BL-5500 LU502085 cavity, the shape and the size error of the jack are ensured to be within a preset range, so as to improve the jacking accuracy of the bridge beam and avoid the influence of the jack’s own error on the bridge jacking. In addition, the cylinder body of the jack cannot be bent and deformed, the cylinder surface shall be free of burrs, the scratch depth is not greater than 1 mm, the abrasion collision area is not larger than 2 cm’ and the number of scratches cannot exceed 2; moreover, the jack shall be free from astringency, crawling, leakage and other phenomena during jacking and expansion.

The jack is gradually boosted under the no-load working condition, the starting pressure of the piston cavity and the piston rod is measured (both in the no-back pressure condition), so as to ensure that the lowest starting pressure of the piston cavity does not to exceed 3.5 Mpa, and the lowest starting pressure of the cavity of the piston rod does not exceed 7.5 Mpa. When the jack rises to the full stroke, the jack is subjected to strength testing, specifically, the jacking unit shall be loaded axially at 150% of its rated working pressure for 5 minutes, and whether the jack is permanently deformed or damaged shall be detected.

Before opening formal jacking operation, the jack is subjected to a pressure maintaining test for 2 hours at a preset jacking force [ 70%, 90% ], so as to ensure the safety and reliability of the jack sealing and the reliability of jacking operation. In addition, the cleanliness of the hydraulic oil needs to be checked, specifically, before the jacking operation, the hydraulic hose is cleaned, the hydraulic hose should be cleaned to ensure that the cleanliness of the hydraulic oil is not lower than NASAS.

The bridge pretreatment comprises leveling the beam bottom of the bridge and the top surface concrete base surface of the supporting cushion. Wherein the top surface of the beam bottom and the supporting cushion stone are processed, so as to ensure the sliding surface level of the support; the support is subjected to a pair of diagonal drilling on the support in advance outside the skylight point, so as to facilitate positioning measurement; the other pair of opposite corners of the support shall be excavated in the skylight point, so that the support can be removed as soon as possible in the skylight

BL-5500 LU502085 point, removing the bolts of the upper and lower plates of the support, so as to ensure the support can be removed without constraint.

In addition, it is necessary to carry out the construction survey of the bridge, bridge pretreatment: leveling the beam bottom of the bridge and the top surface concrete base surface of the supporting cushion; and the center line of the bridge and the center line of the beam bottom support are discharged at the pier top of the pier; the outer contour line of the support is discharged as a control line of the installation support according to the center line; and measuring the height dimension of the existing disease support in detail, and checking it with the original design drawing to measure the space dimension from the bottom of the beam to the top of the pier.

Step S102, determining multiple preset vertices of the bridge, and installing a jacking unit 101 and a monitoring feedback unit 102 at the preset vertices; The structures such as the distribution steel bars may not be arranged at the preset vertex of the selected bridge, therefore, a base plate is arranged at the preset vertex.

Specifically, the integral stress distribution base plate with the thickness of 30 mm is arranged at the bottom of the pier top and the bottom of the beam, so as to effectively prevent excessive local stress in the concrete at the bottom of the beam and pier top and avoid local crushing of the concrete.

The jacking height of the beam body is [5, 8] mm, in the jacking process, the preset fixing constraint of the beam body, the preset transverse constraint and the preset longitudinal constraint are not released, so as to effectively ensure that the beam body of the bridge cannot be offset in the jacking process; the lower sliding layer and the upper sliding layer are respectively arranged between the jacking unit 101 and the temporary support of the bridge, so as to ensure that the beam body of the bridge can still move freely during the replacement of bearings (fixed supports, transverse supports, longitudinal supports). Specifically, the upper sliding layer and the lower sliding layer are 3 mm thick polytetrafluoroethylene plates, further, the temporary support adopts steel cushion blocks, which are welded with channel steel.

Step S103, debugging the jacking unit 101;

BL-5500 LU502085 While debugging the jacking unit 101, chiseling off the mortar layer around the support to remove the diseased bearing in the skylight as soon as possible, and unloading the bolts on the upper and lower plates of the support, so as to ensure that the support is removed without constraint.

Step S104, carrying out a trial jacking test on the bridge, wherein the trial jacking height is 1 mm; When the intelligent bridge synchronous jacking system for the high-speed railway is used for the first time, the pressure maintaining test is carried out for 2 hours according to [ 70%, 90% ] of the normal load, and then the test jacking test is carried out. In the test jacking test process, the height of the test jacking is 1 mm, after the test jacking is finished, the strain, the bridge overall posture and the structural deformation at the predicted vertex are confirmed, and which provides a reference for the formal jacking. In the test jacking test process, strictly monitoring whether there is oil leakage in the oil circuit, and checking and verifying the synchronous jacking of each jack to ensure that the action of the jack is accurate, safe and reliable; the formal jacking can be carried out only after the pressure maintaining test and jacking test are checked to be correct.

Step S 105, carrying out formal jacking of the bridge: according to the bridge jacking displacement sent by the monitoring feedback unit, controlling multiple sets of jacking units to act synchronously, so that the mutual error of jacking displacement at multiple preset vertices is not greater than the preset threshold.

Before formal jacking, the upper and lower structures on the support are fixedly connected, so that the support can be ensured to be smoothly removed without constraint, and during formal jacking, the support can be well recorded according to the following procedures: Operation: loading and jacking according to the preset load; Observation: each measurement point should reflect the measurement situation in time;

BL-5500 LU502085 Measurement: each measurement point should carefully carry out the measurement work and reflect the measurement data in time; Check: collecting and submitting data, and comparing the difference between measured data and theoretical data: Analysis: if there is any data deviation, analyzing and adjusting it in time; Decision-making: recognizing the current working state and deciding the next operation.

Before jacking operation, calculating the upper load of the bridge, and determining the number of bearings and the number of jacks at each bearing according to the upper load of the bridge.

The load on the upper part of the bridge is 950 tons.

Three 200 ton jacking devices are arranged at each support (each jacking device includes: the first transverse jacking jack 201, the second transverse jacking jack 202 and the longitudinal jacking jack 203). A total of 12 jacking devices are arranged at the middle pier (4 supports for each pier), which can provide 2400 tons of jacking force.

Six jacking devices are arranged at the abutment, which can provide 1200t jacking force, and the safety reserve factor is 1.72; the jacking device is symmetrically arranged to facilitate the reasonable stress of the beam body.

Among the three jacking devices at each support, the three jacking devices are fixed through the fixing plate, so that the first horizontal jacking jacks 201 of the three jacking devices are telescopically moved in the first direction, and the second horizontal jacking jacks 202 of the three jacking devices are telescopically moved in the second direction.

At the same time, multiple sets of jacking units at set supports (four sets of jacking units are arranged on the four supports of each pier, each set of jacking units comprises three jacking devices), so that the first transverse jacking jacks 201 in the multiple sets of jacking units can move telescopically in the first direction, and the second transverse jacking jacks 202 can stretch and move in the second direction.

The working pressure of the jack is 63Mpa, the length is 375 mm, the base diameter is 250 mm, the top cap is 180 mm and the stroke is 140 mm, each jack is equipped with a hydraulic lock to prevent any form of system and pipeline pressure loss,

BL-5500 LU502085 so as to ensure the effective support of the load.

The multi-point jacking equipment is controlled by PLC to carry out synchronous jacking of the bridge.

During the jacking process, the jacking displacement of the beam body shall be subject to the hollow support.

At the same time, a mechanical lock is correspondingly arranged at each support, which works together with the hydraulic lock.

With the jacking of the bridge, the mechanical lock rises and contacts the bridge to form an effective support.

Here, it should be noted that the mechanical lock sleeve is arranged outside the cylinder rod of the longitudinal jacking 203. According to the intelligent bridge synchronous jacking method for high-speed railway provided by the embodiment of the present invention, which can realize the actions and steps of any of the above embodiments of the intelligent bridge synchronous jacking system for high-speed railway, and achieve the same technical effect, which will not be repeated here.

Claims (10)

BL-5500 LU502085 CLAIMS

1. An intelligent bridge synchronous jacking system for high-speed railway, characterized by comprising: a jacking unit, a control unit and a monitoring feedback unit; the jacking unit is provided with multiple sets, which are symmetrically distributed at multiple preset vertices of the bridge for synchronous jacking operation of the bridge; wherein the jacking unit keeps the preset fixed constraint, the preset transverse constraint and the preset longitudinal constraint imposed on the bridge when synchronously jacking the bridge; a base plate is arranged between the jacking unit and the preset point, an upper sliding layer is arranged between the upper end of the jacking unit and the base plate, the lower end of the jacking unit is located on the temporary support of the bridge, and a lower sliding layer is arranged between the lower end of the jacking unit and the temporary support; the monitoring feedback unit is provided with multiple, and multiple monitoring feedback units are correspondingly arranged at multiple preset vertexes corresponding to the multiple sets of jacking units, and which are used to monitor the jacking displacement of the bridge in real time; the control unit is electrically connected with multiple monitoring feedback units, which is used to independently control the corresponding jacking units according to the jacking displacement of the bridge sent by the received monitoring feedback unit, multiple sets of jacking units act synchronously, so that the mutual error of jacking position shift at multiple preset vertices is not greater than the preset threshold.

2. The intelligent bridge synchronous jacking system for high-speed railway according to claim 1, characterized in that each set of jacking units comprises multiple jacking devices, and multiple jacking devices are arranged in a linear arrangement or in a zigzag shape at each preset vertex.

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3. The intelligent bridge synchronous jacking system for high-speed railway according to claim 2, characterized in that the jacking device comprises a first transverse jacking jack, a second transverse jacking jack and a longitudinal jacking jack, the first transverse jacking jack, the second transverse jacking jack and the longitudinal jacking jack are arranged perpendicular to each other, and the telescopic axis is intersected with one point; wherein the first transverse jacking jack and the second transverse jacking jack are located in the same horizontal plane, which are respectively used to adjust the transverse displacement of the first direction and the second direction of the bridge, and the longitudinal jack is used to adjust the longitudinal displacement ofthe bridge; and the first direction is the length direction of the bridge, and the second direction is the width direction of the bridge.

4. The intelligent bridge synchronous jacking system for high-speed railway according to claim 3, characterized in that the jacking device further comprises a fixed base, a first sliding base and a second sliding base; the first sliding base is located on the fixed base and can move in the first direction on the fixed base; the second sliding base is located on the first sliding base and can move along the first direction along with the first sliding base, and can move in the second direction on the first sliding base; correspondingly, the fixing part of the first transverse jacking jack is fixedly installed on the side wall of the fixed base, and the telescopic part of the first transverse jacking jack is fixedly connected with the first side wall of the first sliding base; the fixing part of the second transverse jacking jack is fixedly installed on the second side wall of the first sliding base, and the telescopic part of the second transverse jacking jack is fixedly connected with the side wall of the second sliding base; wherein the second side wall is perpendicular to the first side wall; the longitudinal jacking jack is located on the bottom plate of the second sliding base.

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5. The intelligent bridge synchronous jacking system for the high-speed railway according to claim 4, characterized in that the lower surface of the bottom plate of the first sliding base is provided with a first groove, and the first sliding block is fixedly installed in the first groove; correspondingly, the fixed base is provided with a first slide rail along the first direction, and the first slide rail is matched with the first sliding block.

6. The intelligent bridge synchronous jacking system for the high-speed railway according to claim 5, the upper surface of the bottom plate of the first sliding base is provided with a second sliding rail along the second direction; correspondingly, the lower surface of the bottom plate of the second sliding base is provided with a second groove, a second sliding block is fixedly installed in the second groove, and the second sliding block is matched with the second sliding rail.

7. The intelligent bridge synchronous jacking system for the high-speed railway according to claim 1, characterized in that the intelligent bridge synchronous jacking system for the high-speed railway further comprises a sliding support, wherein the sliding support comprises a fixing support part and a sliding support part which can slide relative to each other, the upper surface of the fixing support part and the lower surface of the sliding support part are sliding matching surfaces, and the upper surface of the fixing support part and the upper surface of the sliding support part are always kept parallel.

8. The intelligent bridge synchronous jacking system for the high-speed railway according to claim 7, characterized in that the monitoring feedback unit comprises a stay wire sensor and a level meter,

BL-5500 LU502085 the stay wire sensor 1s provided with multiple, which are correspondingly arranged at multiple preset vertexes for monitoring the jacking displacement at a preset vertex in real time and sending the jacking displacement to the control unit; the level meter is fixedly installed on the sliding support for monitoring the horizontal state of the sliding support in real time.

9. The intelligent bridge synchronous jacking system for the high-speed railway according to any one of claims 1 to 8, characterized in that the control unit controls 4*N sets of symmetrically distributed jacking units to act synchronously according to the received jacking displacement of the bridge sent by the monitoring feedback unit, so that the synchronous precision of the jacking displacement at 4xN preset vertices symmetrically distributed is less than or equal to +0.1 mm; wherein N is a positive integer.

10. The intelligent bridge synchronous jacking method for the high-speed railway, characterized in that the intelligent bridge synchronous jacking system for high-speed railway according to any one of claims 1 to 9 is used to jack the bridge, comprising: step S101, jacking equipment and bridge pretreatment; wherein the pretreatment of jacking equipment comprises: detecting a jacking unit in an intelligent bridge synchronous jacking system for the high-speed railway, wherein the straightness of the piston rod of the jacking unit is not greater than 2%, the straightness of the piston cavity of the jacking unit is not greater than 0.5%, the roundness and cylindricity of the piston cavity is not larger than 2% of its nominal diameter; the minimum starting pressure of the cavity of piston rod and piston cavity is not more 3.5 Mpa and 7.5 Mpa respectively; during the full stroke of the jacking unit, the jacking unit shall be loaded axially at 150% of its rated working pressure for 5 minutes; the jacking unit is subjected to a pressure maintaining test for 2 hours at a preset jacking force of [ 70%, 90% ];

BL-5500 LU502085 bridge pretreatment: leveling the the beam bottom and the top surface concrete base surface of the supporting cushion;

step S102: determining multiple preset vertices of the bridge, and installing a jacking unit and a monitoring feedback unit at the preset vertices;

step S103: debugging the jacking unit;

step S104: carrying out a trial jacking test on the bridge, wherein the trial jacking height is 1 mm;

step S105: carrying out formal jacking of the bridge: according to the bridge jacking displacement sent by the monitoring feedback unit, controlling multiple sets of jacking units to act synchronously, so that the mutual error of jacking displacement at multiple preset vertices is not greater than the preset threshold.