CN115559223A - Incremental launching process for continuous steel box girder skew bridge - Google Patents
Incremental launching process for continuous steel box girder skew bridge Download PDFInfo
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- CN115559223A CN115559223A CN202211352531.8A CN202211352531A CN115559223A CN 115559223 A CN115559223 A CN 115559223A CN 202211352531 A CN202211352531 A CN 202211352531A CN 115559223 A CN115559223 A CN 115559223A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to a continuous steel box girder skew bridge pushing process which comprises the following steps of S1 respectively building pushing construction platforms on two sides of a bridge, wherein each pushing construction platform comprises a front pushing support, a pushing temporary support and a rear pushing support which are arranged between two adjacent piers, slideways respectively arranged on the front pushing support and the rear pushing support, and walking type pushing equipment arranged on the pushing temporary supports; s2, sequentially hoisting a front guide beam and a plurality of steel box girders to the pushing construction platform, assembling the front guide beam and the plurality of steel box girders into a bridge segment, pushing the assembled current bridge segment by the walking type pushing equipment, and repeatedly assembling the next bridge segment. The invention is suitable for bridge pushing with variable height or multi-section curves by reasonably designing the pushing length for multiple rounds and assisting corresponding hoisting control and pushing support arrangement.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a continuous steel box girder oblique crossing bridge pushing process.
Background
In recent years, the construction of national highways is vigorously developed, and with the continuous perfection of the layout of a highway network, bridge projects which span the existing traffic lines are continuously increased, such cross-line projects are mostly controlled projects in a contract section, and need to take into account the influence on the traffic capacity of the existing roads, and the construction period is short, the construction working condition is complex, the construction risk is high, and the construction organization is difficult. If the traditional hoisting process is adopted for construction, a support needs to be erected in a way of occupying the road, the influence on the traffic capacity of the existing line is large, and therefore the traditional hoisting process can be replaced by the pushing process for construction.
In the pushing process, in order to avoid setting up a support in the construction process, a front pushing support is generally arranged in front of a permanent pier, a rear pushing support is arranged behind the permanent pier, and a temporary pushing support is arranged between the permanent pier and the rear pushing support. The elevation of the front pushing support and the elevation of the rear pushing support correspond to the elevation of the bottom of the steel beam after pushing is finished, the elevation of the pushing temporary support is based on the fact that the elevation of the bottom of the steel beam is higher than the elevation of the permanent pier in the pushing process, and the front pushing support, the rear pushing support and the pushing temporary support are all provided with a crawler. During construction, the front pushing support, the rear pushing support and the crawler on the pushing temporary support push the steel beam until the highest section part of the steel beam is close to the temporary support, the pushing temporary support is dismounted, and the crawler of the front pushing support and the crawler of the rear pushing support continuously push the steel beam until the highest section part of the steel beam crosses over the temporary support. Therefore, the influence on the traffic capacity of the existing line is small, the number of the supports is small, the construction efficiency is improved, the construction period is shortened, and meanwhile, the safety in the construction process can be improved.
The length of the existing splicing platform only meets the requirement of the main beam splicing length in one round, and after one round of ejection, no beam section for maintaining the linear shape is reserved on the platform, so that the subsequent beam sections cannot realize the unstressed splicing linear shape; on the other hand, in the existing platform stress calculation method, the stress condition of all the fulcrums of the lower part of the beam section left on the platform is considered, but the redistribution condition of stress on the adjacent fulcrums caused by partial fulcrum release is ignored, and under the condition, the stress on the adjacent local fulcrums is increased, so that the maximum counter force of the shifter and the platform is increased. In addition, due to the influence of the pre-camber of the steel box girder or other factors in the pushing process, when the bottoms of the steel box girders are not on the same horizontal line, the steel box girder may be excessively eccentric, so that the steel box girder is separated from the walking type pushing equipment, and improvement is needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a continuous steel box girder skew bridge pushing process, which is suitable for the bridge pushing with variable height or multi-section curves by reasonably designing multiple pushing lengths and assisting corresponding hoisting control and pushing support arrangement.
The above object of the present invention is achieved by the following technical solutions:
a continuous steel box girder skew bridge pushing process comprises the following steps,
s1, respectively building pushing construction platforms on two sides of a bridge, wherein each pushing construction platform comprises a front pushing support, a pushing temporary support and a rear pushing support which are arranged between two adjacent piers, slideways respectively arranged on the front pushing support and the rear pushing support, and walking type pushing equipment arranged on the pushing temporary supports;
s2, sequentially hoisting a front guide beam and a plurality of steel box girders to the incremental launching construction platform, assembling the bridge sections into bridge sections, pushing the assembled current bridge section by using the walking incremental launching equipment, and repeatedly assembling the next bridge section.
The continuous steel box girder oblique crossing bridge pushing process according to claim 1, which is characterized in that: in S1, the distance between the front pushing support and the distance between the rear pushing support and the pier are respectively 10m, the distance between the front pushing support and the pushing temporary support is 12m, and the distance between the pushing temporary support and the rear pushing support is 8m.
Further, in S1, the distance between the front pushing support and the rear pushing support and the pier is 10m, the distance between the front pushing support and the pushing temporary support is 12m, and the distance between the pushing temporary support and the rear pushing support is 8m.
Further, in the step S1, the pushing temporary support adopts a floor tubular pile support structure.
Further, in the S2, the following steps are included,
s21, hoisting a 48m steel box girder a and a 30m front guide girder above a construction platform, enabling the steel box girder a and the front guide girder to be supported by a plurality of slideways, then connecting the steel box girder a and the front guide Liang Shouwei to obtain a bridge segment a, and pushing the bridge segment a forwards by 33.5m through walking type pushing equipment;
s22, hoisting a 36m steel box girder b to the position above a construction platform, enabling the steel box girder b to be supported by a plurality of slideways, then enabling the steel box girder b and a steel box girder a of a bridge segment a to be connected end to obtain a bridge segment b, and pushing the bridge segment b forwards by 36m through walking type pushing equipment;
s23, hoisting a 34m steel box girder c to the position above a construction platform, supporting the steel box girder c by a plurality of slideways, connecting the steel box girder c and a steel box girder b of a bridge segment b end to obtain a bridge segment c, and pushing the bridge segment b forward by 23m by walking type pushing equipment;
s24, hoisting the 36m steel box girder d above a construction platform, enabling the steel box girder d to be supported by a plurality of slideways, then enabling the steel box girder d and the steel box girder c of the bridge segment c to be connected end to obtain the bridge segment d, and completing pushing
Further, in S21, the top surface of the front guide beam is a step surface inclined downward in a direction away from the steel box girder a.
Further, in the step S2, the hoisting process includes tying 2 cables to the fixed embedded part of the steel box girder or the front guide girder in advance, and setting control points or lines on the pier, the front pushing support, the pushing temporary support and the rear pushing support; during hoisting, the steel box beam or the front guide beam is hoisted to a preset height away from a hoisting point to push the top surface of the temporary support, then the steel box beam or the front guide beam is rotated to a position above a preset installation position, the crane hook is hoisted to the preset height away from the top surface of the temporary support, then the central line and the longitudinal distance of the steel box beam or the front guide beam are controlled to correspond to the control point or line, and then the steel box beam or the front guide beam is installed.
Further, in the step S2, during hoisting, the steel box beam or the front guide beam is hoisted to a hoisting point which is 0.8 to 1.2m away from the top surface of the pushing temporary support, and then is rotated to a position above a preset installation position, and the crane hook is dropped to hoist the steel box beam or the front guide beam to a distance which is 8 to 12cm away from the top surface of the pushing temporary support.
Further, in the S2, the walking pushing apparatus is a SLBLJ-450 type walking machine.
Further, in the step S2, the pushing process includes that the walking type pushing device controls the jacking and extending cylinder to a set piston stroke through an electrical system, and jacks up the steel box girder or the front guide girder and leaves 3cm ± 0.1cm away from the pier; the walking type pushing equipment feeds back a set distance to an electrical system through a displacement sensor so as to control the pushing device to move forwards by 30cm and reach a preset position; then, jacking and retracting cylinders of the walking type jacking equipment, and enabling the steel box girder or the front guide girder to fall to a pier, a front jacking support, a jacking temporary support and/or a rear jacking support; then the walking pushing equipment is reset, and the steps are repeated.
Further, in the S2, the jacking time is controlled to be 23 to 45s, the jacking time is controlled to be 140 to 145s, and the falling time is controlled to be 20 to 25s.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the length of the pushing construction platform and the distance between each part in the pushing construction platform and a pier are reasonably designed, so that the pushing construction platform is suitable for splicing pushing of each section of bridge segment, and the pushing construction platform is suitable for pushing bridges with variable heights or multi-section curves while considering the construction efficiency;
2. in the invention, the length and the pushing distance of the steel box girder and the front guide girder are optimized in the single pushing process to adjust the balance weight between the bridge segment and the pushing construction platform, so that the method is suitable for multiple rounds of continuous pushing operation;
3. according to the invention, through hoisting control and pushing process control of the walking type pushing equipment, the bottom of the steel box girder can be prevented from generating overlarge eccentricity, and the pushing precision can be ensured.
Drawings
FIG. 1 is a flow chart of the incremental launching process of the present invention.
Fig. 2 is a schematic view of the connection between the pusher temporary stand and the walking pusher apparatus of the present invention.
Fig. 3 is a schematic structural view of the front guide beam of the present invention.
FIG. 4 is a construction flow chart of the splicing and pushing of the bridge segment of the present invention.
Fig. 5 is a schematic structural view of the walking pushing apparatus of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained in the following with the accompanying drawings and the detailed description.
Referring to fig. 1, the continuous steel box girder oblique crossing bridge pushing process disclosed by the invention comprises the following steps,
s1, respectively building and pushing construction platforms on two sides of bridge
The method comprises the following steps that a front pushing support, a pushing temporary support and a rear pushing support are sequentially arranged between two adjacent piers, then slideways are respectively arranged on the front pushing support and the rear pushing support, and a pair of walking type pushing devices is arranged on the pushing temporary supports; referring to fig. 2, the pushing temporary support adopts a floor tubular pile support structure, the distances between the front pushing support and the pier and between the rear pushing support and the pier are respectively 10m, the distance between the front pushing support and the pushing temporary support is 12m, and the distance between the pushing temporary support and the rear pushing support is 8m;
s2 hoisting of steel box girder and front guide beam
Before hoisting, 2 cables are tied on a fixed embedded part of the steel box girder or the front guide girder, and control points or lines are arranged on the bridge pier, the front pushing support, the pushing temporary support and the rear pushing support;
during hoisting, firstly hoisting the steel box girder or the front guide girder to a hoisting point which is 1m away from the top surface of the temporary support, then rotating to a position above a preset installation position, hoisting the steel box girder or the front guide girder to a position which is 10cm away from the top surface of the temporary support by a crane hook, then controlling the central line and the longitudinal distance of the steel box girder or the front guide girder to correspond to the control point or line, and then installing the steel box girder or the front guide girder; wherein, the allowable deviation of the steel box girder or the front guide girder after installation is in accordance with the regulations of the table 1,
TABLE 1
Referring to FIG. 4, the splicing pushing of S3 bridge segment
S31, hoisting a 48m steel box girder a and a 30m front guide girder above a construction platform, supporting the steel box girder a and the front guide girder by a plurality of slideways, connecting the steel box girder a with the front guide Liang Shouwei to obtain a bridge segment a, and pushing the bridge segment a forwards for 33.5m by walking type pushing equipment; referring to fig. 3, the top surface of the front guide beam is a step surface inclined downward along the direction away from the steel box girder a;
s32, hoisting a 36m steel box girder b to the position above a construction platform, enabling the steel box girder b to be supported by a plurality of slideways, then enabling the steel box girder b and the steel box girder a of the bridge segment a to be connected end to obtain a bridge segment b, and pushing the bridge segment b forwards for 36m through walking type pushing equipment;
s33, hoisting a 34m steel box girder c to the position above a construction platform, enabling the steel box girder c to be supported by a plurality of slideways, then enabling the steel box girder c and a steel box girder b of a bridge segment b to be connected end to obtain a bridge segment c, and pushing the bridge segment b forward by 23m through walking type pushing equipment;
s34, hoisting a 36m steel box girder d to the position above a construction platform, supporting the steel box girder d by a plurality of slideways, connecting the steel box girder d with a steel box girder c of a bridge segment c end to obtain the bridge segment d, and completing pushing;
after the single pushing is finished, controlling the self weight of a front guide beam on the rear pushing support to be more than 1.5 times of the self weight of a steel box girder or a steel box girder on the front pushing support;
referring to fig. 5, in addition, the walking pushing equipment selects an SLBLJ-450 type walking machine, which includes a chute, a slide box, a slide seat, a jacking top, a deviation correcting device, an optional pier placing device, a hydraulic system and an electrical system. The bottom end of the walking type pushing equipment is provided with a fixed sliding chute, the sliding box is placed and installed on the sliding chute, one end of the pushing top is hinged on the sliding box, and the other end of the pushing top is detachably connected with the sliding chute and is used for driving the sliding box to push and move forwards and backwards; the horizontal deviation correcting devices are arranged on two sides of the sliding box and are used for driving the sliding seat to move in a left-right deviation correcting mode; the jacking top is fixed on a sliding seat in the sliding box and used for driving the object to be jacked to move up and down. Each sliding surface adopts a stainless steel plate and MGE plate oiling lubrication system, and the friction coefficient is small and constant. The selected laying pier is a member for placing the box girder when the girder falls circularly each time in the pushing process, and is a force system conversion device. The hydraulic system is composed of a motor, a plunger pump, a gear pump, an electromagnetic ball valve, an overflow valve, a regulating valve, a flow collecting valve, a pressure relief valve, an integrated block and the like. The electric system comprises hardware circuit, touch-sensitive screen, industrial computer, PLC main website, slave station communication module, displacement sensor, pressure sensor, inclination sensor (optional), color mark sensor (optional) etc..
In the pushing process, the walking type pushing equipment controls a jacking and stretching cylinder to a set piston stroke through an electrical system, a steel box girder or a front guide girder is jacked up and leaves a pier for 3cm +/-0.1 cm, and the jacking time is 23 to 45s; feeding back a set distance to an electrical system by the walking type pushing equipment through a displacement sensor to control the pushing to horizontally move for 30cm before pushing and reach a preset position, wherein the pushing time is 140-145s; then, jacking and retracting a cylinder of walking type jacking equipment, and enabling a steel box girder or a front guide girder to fall onto a pier, a front jacking support, a jacking temporary support and/or a rear jacking support, wherein the falling time is 20 to 25s; then the walking pushing equipment is reset, and the steps are repeated.
The slide box on the walking type pushing equipment corresponds to the steel box girder web plate so as to prevent the steel box girder from being deformed due to too large local pressure. Due to the influence of the pre-camber of the box girder or other factors in the pushing process, when the bottoms of the steel box girders are not on the same horizontal line, excessive eccentric force can be generated. In order to prevent the situation, the pier and the walking type pushing equipment are both provided with the hemispherical spherical crown, so that the distribution beam on the spherical crown can be kept to be always in close contact with the bottom plate of the steel box girder, and the bottom plate of the steel box girder is prevented from being separated from the walking type pushing equipment.
In order to solve the construction of large-area and large-span super-large structure, a control system based on a real-time network is utilized, and the computer control integral installation of large components in different industries and different types can be adapted by changing certain hardware and modifying software configuration and control algorithm. The system mainly comprises a real-time control system hardware module, real-time control system software, a real-time control network, a pump station Slave station module unit (Slave station module) and a Sensor control module unit (Sensor module).
In the control system, each walking machine is provided with a slave station control system which mainly has the functions of acquiring feedback data of a sensor and receiving an instruction of a main controller to drive a hydraulic electromagnetic valve, and a slave station control module is connected with a master station CPU control module through a ProfiBus-DP bus; the master station controller realizes centralized control of the whole system, and comprises the following steps: jacking, control of a pushing device, calculation processing of pressure data, displacement data, an inclined state, central axis deviation and the like, and alarming of various faults.
a. Control system network topology:
a closed-loop feedback system is formed by the pump station slave station control module, the sensor acquisition module, the analog quantity module and the main controller, and the pushing displacement, the angle and the axle line judgment and the load of each point can be adjusted in real time on the basis of a ProfiBus-DP bus transmission protocol and a medium. b. The controller comprises the following hardware components:
the main controller is a standard embedded industrial personal computer platform and a standard man-machine interface operation platform, processes signals sent by various sensors, and outputs control signals after certain control algorithm and control strategy.
The CPU module has good expansibility, and can expand a plurality of modules to enable the modules to be in a hot backup state. When the main CPU is in a dead halt state, the slave CPU is immediately switched to a host state to work. Meanwhile, due to the watchdog, the dead CPU can be automatically restarted and switched to the hot backup mode.
c. Slave station controller hardware consists of:
the slave station communication controller mainly comprises three modules, a communication module, an I/O control module and an analog quantity acquisition module. The I/O control module mainly comprises a part: and the electromagnetic valve driving module. The analog quantity control module comprises a part: and a data acquisition module. The communication module mainly receives a control command sent by the host computer, performs CRC (cyclic redundancy check) on the information frame, records the communication failure occurrence rate, and sends a feedback information frame to the host computer and the like;
the method is mainly characterized in that: the key action realizes the dual interlocking of hardware and software; the slave station communication module can not receive the signal of the master control cabinet within 3 seconds and immediately stops all actions; the slave station communication module automatically feeds back an information frame to the main control cabinet within 2 seconds and reports the current communication state; all pump stations can be stopped all actions by one button with an emergency stop. The sensor acquisition module is mainly used for acquiring the current state information of the oil cylinder and feeding the current state information back to the main control system in real time.
The current state information of the oil cylinder mainly comprises: the stroke of the oil cylinder; the bottom of the steel beam is sloped; the pressure of the cylinder. The hardware circuit designed according to the sensor can collect various digital quantity or analog quantity signals with high precision.
The method is mainly characterized in that: the sensor signal amplifying and converting circuit has high precision; the sensor data is sent once every 10ms, so that the real-time performance is good; and the anti-interference capability is strong by bus transmission.
In order to prevent the steel box girder from transversely deviating in the pushing process, whether the steel box girder deviates or not needs to be checked after each pushing stroke is completed, if the deviation distance is within the allowable range, pushing can be continued, and if the deviation distance is about to exceed the allowable displacement, deviation correction is needed. The main control measures for deviation rectification are as follows:
1. and calculating the bottom elevation of the steel box girder according to the route elevation and the pre-camber design data of the steel box girder.
2. And calculating the mounting elevations corresponding to the supports according to the arrangement of the on-site assembling and pushing supports, and mounting the supports according to the mounting elevations.
3. And calculating the corresponding elevation after the relative displacement of each corresponding fulcrum according to the characteristics (program control mode) of the walking machine, and compiling a pushing elevation data control table.
4. Control marks are arranged in the middle (middle line position) of the front end and the tail end of the steel box girder, and total station measuring reflection equipment is adhered to the mark positions. And measuring the coordinates of each control point by using a total station through the existing bridge measurement control points, and then inversely calculating the corresponding pile number of the position where the steel box girder is located and the transverse offset (offset) of the position where the steel box girder is located.
5. And (3) observing the offset (center line offset) of the control mark on the steel box girder by using a total station in time, and feeding the offset to a walking machine operator to correct the offset in time so as to meet the construction requirement.
6. When the central control system detects that the steel box girder body deviates or workers find the deviation, the number of the walkers to be corrected is determined according to the deviation condition, and because each walker is provided with two transverse deviation correcting tops, the deviation under various conditions can be adjusted. If only the front end of the steel box girder deviates, only the front-end walking machine needs to be locally corrected, and if the whole steel box girder deviates or rotates slightly, the deviation distance and the deviation angle can be adjusted through the front and rear deviation correcting top. When the deviation is corrected, the vertical jack of the crawler is in a jacking state, the deviation correcting jacks on the two sides drive the sliding box on the upper portion of the crawler to further drive the steel box girder to shift leftwards or rightwards, the shifting distance can be adjusted according to the stroke of the deviation correcting jacks, after the deviation correction is completed, the deviation correcting jacks are recovered, and the vertical jack falls back. And then the next pushing cycle is carried out.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A continuous steel box girder oblique crossing bridge pushing process is characterized in that: comprises the following steps of (a) carrying out,
s1, respectively building pushing construction platforms on two sides of a bridge, wherein each pushing construction platform comprises a front pushing support, a pushing temporary support and a rear pushing support which are arranged between two adjacent piers, slideways respectively arranged on the front pushing support and the rear pushing support, and walking type pushing equipment arranged on the pushing temporary supports;
s2, sequentially hoisting a front guide beam and a plurality of steel box girders to the pushing construction platform, assembling the front guide beam and the plurality of steel box girders into a bridge segment, pushing the assembled current bridge segment by the walking type pushing equipment, and repeatedly assembling the next bridge segment.
2. The continuous steel box girder oblique crossing bridge pushing process according to claim 1, which is characterized in that: in S1, the distance between the front pushing support and the distance between the rear pushing support and the pier are respectively 10m, the distance between the front pushing support and the pushing temporary support is 12m, and the distance between the pushing temporary support and the rear pushing support is 8m.
3. The continuous steel box girder oblique crossing bridge pushing process according to claim 1, which is characterized in that: and in the S1, the pushing temporary support adopts a floor tubular pile support structure.
4. The continuous steel box girder oblique crossing bridge pushing process according to claim 1, which is characterized in that: in the step S2, the following steps are included,
s21, hoisting a 48m steel box girder a and a 30m front guide girder above a construction platform, enabling the steel box girder a and the front guide girder to be supported by a plurality of slideways, then connecting the steel box girder a and the front guide Liang Shouwei to obtain a bridge segment a, and pushing the bridge segment a forwards by 33.5m through walking type pushing equipment;
s22, hoisting a 36m steel box girder b to the position above a construction platform, enabling the steel box girder b to be supported by a plurality of slideways, then enabling the steel box girder b and a steel box girder a of a bridge segment a to be connected end to obtain a bridge segment b, and pushing the bridge segment b forwards by 36m through walking type pushing equipment;
s23, hoisting a 34m steel box girder c to the position above a construction platform, supporting the steel box girder c by a plurality of slideways, connecting the steel box girder c and a steel box girder b of a bridge segment b end to obtain a bridge segment c, and pushing the bridge segment b forward by 23m by walking type pushing equipment;
s24, hoisting the 36m steel box girder d to the position above the construction platform, enabling the steel box girder d to be supported by a plurality of slideways, then enabling the steel box girder d and the steel box girder c of the bridge segment c to be connected end to obtain the bridge segment d, and completing pushing.
5. The continuous steel box girder oblique crossing bridge jacking process as claimed in claim 4, wherein the jacking process comprises the following steps: in S21, the top surface of the front girder is a step surface inclined downward in a direction away from the steel box girder a.
6. The continuous steel box girder oblique crossing bridge pushing process according to claim 4, wherein the process comprises the following steps: in the S2, the hoisting process comprises the steps of tying 2 cables on a fixed embedded part of the steel box girder or the front guide girder in advance, and arranging control points or lines on the bridge pier, the front pushing support, the pushing temporary support and the rear pushing support; during hoisting, the steel box beam or the front guide beam is hoisted to a preset height away from a hoisting point to push the top surface of the temporary support, then the steel box beam or the front guide beam is rotated to a position above a preset installation position, the crane hook is hoisted to the preset height away from the top surface of the temporary support, then the central line and the longitudinal distance of the steel box beam or the front guide beam are controlled to correspond to the control point or line, and then the steel box beam or the front guide beam is installed.
7. The continuous steel box girder oblique crossing bridge pushing process as claimed in claim 6, wherein the process comprises the following steps: in S2, during hoisting, the steel box beam or the front guide beam is hoisted to a hoisting point 0.8 to 1.2m away from the top surface of the pushing temporary support, then the steel box beam or the front guide beam is rotated to a position above a preset installation position, and the crane hook is hoisted to a position 8 to 12cm away from the top surface of the pushing temporary support.
8. The continuous steel box girder oblique crossing bridge pushing process according to claim 4, wherein the process comprises the following steps: in the S2, the walking pushing device is an SLBLJ-450 type walking machine.
9. The continuous steel box girder oblique crossing bridge jacking process as claimed in claim 8, wherein: in the step S2, the pushing process comprises the steps that the walking type pushing equipment controls a jacking and extending cylinder to reach a set piston stroke through an electrical system, and a steel box girder or a front guide girder is jacked up and is 3cm +/-0.1 cm away from a bridge pier; the walking type pushing equipment feeds back a set distance to an electrical system through a displacement sensor so as to control the pushing device to move forwards by 30cm and reach a preset position; then, jacking and retracting cylinders of the walking type jacking equipment, and enabling the steel box girder or the front guide girder to fall to a pier, a front jacking support, a jacking temporary support and/or a rear jacking support; then the walking type pushing equipment is reset, and the steps are repeated.
10. The continuous steel box girder oblique crossing bridge jacking process as claimed in claim 9, wherein: in the S2, the jacking time is controlled to be 23 to 45s, the jacking time is controlled to be 140 to 145s, and the falling time is controlled to be 20 to 25s.
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| CN117571358A (en) * | 2024-01-15 | 2024-02-20 | 湖北楚天联发路桥养护有限公司 | Method and system for detecting performance of pushing device for bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117571358A (en) * | 2024-01-15 | 2024-02-20 | 湖北楚天联发路桥养护有限公司 | Method and system for detecting performance of pushing device for bridge |
| CN117571358B (en) * | 2024-01-15 | 2024-04-02 | 湖北楚天联发路桥养护有限公司 | Method and system for detecting performance of pushing device for bridge |
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