CN118186924A - Multi-point curve pushing method for steel structure bridge - Google Patents
Multi-point curve pushing method for steel structure bridge Download PDFInfo
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- CN118186924A CN118186924A CN202410336648.XA CN202410336648A CN118186924A CN 118186924 A CN118186924 A CN 118186924A CN 202410336648 A CN202410336648 A CN 202410336648A CN 118186924 A CN118186924 A CN 118186924A
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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
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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
- E01D19/00—Structural or constructional details of bridges
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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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Abstract
The invention provides a multipoint curve pushing method for a steel structure bridge, which simulates a pushing route of a steel box girder; erecting a pushing support, pushing equipment and a pushing auxiliary structure thereof; starting a hydraulic pump station to synchronously jack up the steel box girder by a jacking oil cylinder in the walking type pushing equipment, and monitoring the oil top elongation of the jacking oil cylinder to ensure the safe gradient during pushing; continuously observing from the beginning of force application, stopping force application immediately once the maximum supporting counter force of a single pushing device is higher than a preset value, and readjusting the pushing force of each pushing device; stopping the jacking oil cylinder, and synchronously pushing the jacking oil cylinder forwards for a stroke distance L; stopping the pushing cylinder, jacking the cylinder, and enabling the pushed steel box girder to fall on the temporary hand-changing support to correct the position to be corrected in time; and (3) retracting the pushing cylinder until the pushed steel box girder is pushed to the installation position. The method can effectively reduce the installation error of the road ramp bent bridge and improve the construction efficiency of the pushing process.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a multi-point curve pushing method for a steel structure bridge.
Background
With the rapid development of society and economy, traffic infrastructure has also been a great advancement. The pushing method is the most commonly used construction mode in bridge construction in China at present, and is widely adopted in the construction of steel box girders. However, due to the complex stress conditions, the problems of stress, deformation, transverse stability, overturning and the like of the urban curved steel box girder bridge are needed to be researched. In the propelling process of the curved steel box girder bridge, the longitudinal line shape of the curved steel box girder bridge is frequently changed, and high precision is required for construction control.
The pushing is divided into multi-point pushing and centralized single-point pushing, compared with the multi-point pushing and centralized single-point pushing, the configuration of large pushing equipment can be avoided, the deflection of the beam body during pushing can be effectively controlled, and the supporting counter force of a single pushing equipment during pushing can be reduced more. The pushing points synchronously cooperate to ensure that the steel box girder is stressed uniformly and moves stably, and the shaking phenomenon can not occur in the condition of starting and stopping the steel box girder. The three degrees of freedom of jacking, pushing and side moving can all independently move, the pushing route of the steel box girder can be corrected and adjusted in time in the pushing process, and the pushing and positioning accuracy can reach millimeter level by adjusting the lateral position of the steel box girder in real time. However, the multipoint pushing requires more equipment and devices, the requirement on synchronism and the like in operation is higher, and the pushing stroke required by the curve pushing on the inner arc and the outer arc is inconsistent.
Disclosure of Invention
The invention aims to provide a multipoint curve pushing method for a steel structure bridge, aiming at the problems, by reasonably arranging pushing brackets, continuously detecting the line shape of a steel box in the construction process and adjusting equipment in real time, the integral installation accuracy of the steel box girder is improved; the method can effectively reduce the installation error of the road ramp bent bridge and improve the construction efficiency of the pushing process.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: a multipoint curve pushing method for a steel structure bridge comprises the following steps:
S01: simulating a pushing route of the steel box girder, and calculating an allowable value of the deviation of the central axis in the pushing process;
s02: erecting a pushing support, pushing equipment and a pushing auxiliary structure thereof;
S03: starting a hydraulic pump station to synchronously jack up the steel box girder by a jacking oil cylinder in the walking type pushing equipment, and monitoring the oil top elongation of the jacking oil cylinder to ensure the safe gradient during pushing;
s04: continuously observing from the beginning of force application, stopping force application immediately once the maximum supporting counter force of a single pushing device is higher than a preset value, and readjusting the pushing force of each pushing device;
S05: stopping the jacking oil cylinder, synchronously pushing the jacking oil cylinder forwards by a stroke distance L, wherein the forward pushing distance of the steel box girder is L;
S06: stopping the pushing cylinder, jacking the cylinder, and enabling the pushed steel box girder to fall on the temporary hand-changing support to correct the position to be corrected in time;
s07: and (3) retracting the pushing cylinder, and repeating the steps S03 to S06 until the pushed steel box girder is pushed to the installation position.
Preferably, in the route simulation method in S01, before pushing, collision detection and construction simulation are performed on the pushed steel box girder through parameterized three-dimensional design software Solidworks, so as to obtain an allowable value of axis deviation, and ensure that the pushed route has no interference with the environment and the topography.
Preferably, in the step S02, the pushing support is erected below the steel box girder, hardening is performed on the ground to form an enlarged foundation, a plurality of steel pipe supports are arranged, a plurality of cross beams and longitudinal beams are arranged on the steel pipe supports, and then walking pushing equipment and a hand-changing support are arranged.
Preferably, the bottom surface of the pushed beam body transversely has a certain slope and changes along the length direction, based on the slope, the balanced beam is arranged on the upper part of the walking type pushing equipment, a cushion block is placed according to the line type of the bottom surface of the beam body, and a rubber sheet is placed on the cushion block, so that paint on the surface of the steel box beam is protected, and meanwhile, the friction force born by the steel box beam is increased, so that the steel box beam cannot slide during pushing.
Preferably, the cushion block adopts a plurality of blocks in combination and has a certain elastic self-adaptive compression amount, and when the elastic adjustment range is exceeded, the corresponding steel cushion block is increased or decreased in time according to actual conditions so as to ensure that all points are stressed simultaneously.
Preferably, the method for analyzing and calculating the stress of the pushing bracket in the step S02 is as follows:
Analyzing the structure by adopting finite element analysis software Midas/Civil, and analyzing the strength, deformation and stability of the pushing support under the loaded state through a pushing lifting stage, a pushing carrying stage and a supporting stage respectively, wherein the vertical maximum deformation value of the steel pipe, the maximum horizontal displacement value of the top of the steel pipe, the maximum stress value of the steel pipe and the maximum unilateral fulcrum counterforce are obtained by software; in the support stage, wind load on the side surface of the steel box girder is loaded on the top cross beam of the bracket in a form of concentrated force;
wherein, the vertical maximum deformation of the support steel pipe is less than H/400; the maximum horizontal displacement of the top of the support steel pipe is less than H/500; the maximum normal stress of the support steel pipe is less than [ sigma ]; the maximum shear stress of the support steel pipe is less than tau, wherein H is the span of the steel pipe, sigma is the design value of tensile strength, compressive strength and bending strength of the steel structure, and tau is the design value of the shear strength of the steel structure.
Preferably, the pushing equipment is a three-dimensional adjusting machine structure part assembly and comprises a jacking oil cylinder, a longitudinal pushing oil cylinder and a transverse pushing oil cylinder; the stainless steel plate is arranged on the welded top surface of the base, the tetrafluoro plate is arranged below the base, the plate surface faces downwards and is contacted with the pushing slide way, and after the pushing slide way is kept clean, the lubricating silicone grease is coated.
Preferably, the correcting step specifically includes the following steps:
The steel box girder has a certain curve on a flat plane and a vertical plane, the pushing route needs to be subjected to curve compensation, based on the curve compensation, the contact position of walking type pushing equipment on each temporary pier and the steel box girder needs to be monitored in real time in the whole pushing process, the top edge of the pushing equipment is ensured not to exceed the bottom edge of the steel box girder, the elongation of a vertical jacking cylinder also needs to be monitored, the safety gradient during pushing is ensured, the transverse position adjustment and the increase and decrease of a vertical cushion block are timely carried out, and the good contact and the stress position of the walking type pushing equipment and the bottom surface of the box girder are ensured;
In the sliding construction process, the total station is utilized to carry out construction measurement on the node process, the gap between the actual deflection value and the theoretical value is checked, and as the two ends of the pushed beam body have a certain curvature radius, when the axis deviation of the corresponding beam body exceeds a preset value, correction is needed, and synchronous adjustment is carried out by utilizing the transverse pushing oil cylinder of the walking type equipment, so that the accuracy in place is ensured.
Preferably, the friction force is calculated according to the fulcrum reaction force of the working condition and verified with the oil pressure gauge, and when the maximum friction force is greater than the horizontal component force of the steel adding box Liang Zongpo% of the total weight, the square can be pushed safely.
Preferably, when pushing the final beam section, the final position should be pushed at night with stable temperature, and the length of the beam should be carefully calculated and measured according to the temperature, and small stroke movement should be adopted when pushing the final beam section for correction and longitudinal movement in place.
The invention has the following beneficial effects:
1. The invention ensures that the steel box girder is uniformly stressed and stably moved by synchronously and cooperatively working a plurality of pushing points, and the shaking phenomenon can not occur when the steel box girder is started or stopped. The safety and stability in the cooperative work construction process are improved, and the engineering efficiency and quality are improved
2. By means of the correction method of pushing, three degrees of freedom independent movement of jacking, pushing and side moving can be achieved through the arrangement of the jacking and pushing devices, so that pushing equipment can be corrected and adjusted in time in the pushing process, the lateral position of the steel box girder can be adjusted in real time, and the pushing and positioning accuracy reaches the millimeter level. The method remarkably improves the construction efficiency and accuracy, further reduces the labor cost of repeatedly moving equipment, and improves the safety;
3. in pushing construction, friction sliding occurs in the equipment, the horizontal force applied to the lower support is small, and the consumption of temporary facilities can be reduced. The construction method can reduce the influence on the bridge and protect the structural integrity and safety of the bridge.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a front view of the pushing point arrangement of the present invention.
FIG. 2 is a top view of the push point arrangement of the present invention.
Fig. 3 (a) (b) is a schematic plan view of the pushing bracket of the present invention.
FIG. 4 (a) and (b) are schematic cross-sectional views of the pushing stent of the present invention.
Fig. 5 is a schematic view of a vertical construction of a pushing bracket according to the present invention.
Figure 6 is a front view of the walking type pushing device of the present invention.
Figure 7 is a top view of the walking type pushing device of the present invention.
Figure 8 is a side view of the walking type pushing device of the present invention.
In the figure: the pushing device comprises pushing equipment 1, a hand-changing support 2, a steel box girder 3, a longitudinal girder 4, a 5-expansion foundation, a 6-balance girder, a 7-jacking oil cylinder, an 8-pushing oil cylinder and a 9-pushing slide way.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
Referring to fig. 1-8, a multi-point curve pushing method for a steel structure bridge comprises the following steps:
s01: simulating a pushing route of the steel box girder 3, and calculating an allowable value of the deviation of the central axis in the pushing process;
s02: erecting a pushing support, pushing equipment 1 and a pushing auxiliary structure thereof;
S03: starting a hydraulic pump station to synchronously jack up the steel box girder 3 by the jacking oil cylinder 7 in the walking type pushing equipment 1, and monitoring the oil top elongation of the jacking oil cylinder 7 to ensure the safe gradient during pushing;
S04: continuously observing from the beginning of force application, stopping force application immediately once the maximum supporting counter force of a single pushing device 1 is higher than a preset value, and readjusting the pushing force of each pushing device 1;
s05: stopping the jacking cylinder 7, and synchronously pushing the jacking cylinder 8 forwards by a stroke distance of 500mm, wherein the steel box girder 3 is pushed forwards by a distance of 500mm;
S06: stopping the pushing cylinder 8, retracting the jacking cylinder 7, and enabling the pushed steel box girder 3 to fall on the temporary hand-changing support 2 to correct the position to be corrected in time;
s07: and (3) retracting the pushing cylinder 8, and repeating the steps S03 to S06 until the pushed steel box girder 3 is pushed to the installation position.
Further, the route simulation method in step S01 includes that before pushing, collision detection and construction simulation are performed on the pushed steel box girder through parameterized three-dimensional design software Solidworks, an allowable value of axis deviation is obtained, meanwhile, comprehensive investigation and evaluation are performed on a construction site, and interference of the pushed route with the environment and the topography is guaranteed through comprehensive consideration of various factors. Through the simulation of the pre-three-dimensional virtual route, the safety guarantee is provided for the subsequent normal pushing operation.
Furthermore, in the embodiment, the pushing mode is multi-point pushing, and pushing equipment is arranged on each supporting frame, so that stability and safety in pushing the steel box girder are guaranteed.
Further, step S02 pushes against the support to set up below the steel case roof beam, harden on the ground and make the expansion foundation, arrange several steel pipe supports, set up several crossbeams and longerons on the upper, then arrange the walking type to push against the apparatus and change hand to support. The bottom surface of the pushed beam body is transversely provided with a certain slope and changes along the length direction, so that the upper part of the walking type pushing equipment is provided with a pushing pad beam and a pad block is placed according to the line type of the bottom surface of the beam body. Rubber sheets are also required to be placed on the cushion blocks, so that the friction force born by the steel box girder can be increased when the paint on the surface of the steel box girder is protected, and the steel box girder cannot slide when being pushed. The cushion block adopts a plurality of blocks of combination type and has certain elastic self-adaptive compression quantity, and when the elastic adjustment range is exceeded, the corresponding steel cushion block is increased or decreased in time according to the actual condition so as to ensure that all points are stressed simultaneously. Meanwhile, in order to ensure the stability of the steel box girder in the pushing process, the pushing equipment and the hand-changing support are required to be detected and maintained regularly, the normal working state of the steel box girder in the using process is ensured, and the steel box girder with the transverse slope and the length direction being changed is required to be measured and adjusted accurately, so that the pushing construction is ensured to be carried out smoothly.
Further, the method for analyzing and calculating the stress of the pushing bracket in the step S02 is as follows:
The structure is analyzed by adopting finite element analysis software Midas/Civil, and the strength, the deformation and the stability of the pushing support in the loaded state are analyzed through the pushing lifting stage, the pushing carrying stage and the supporting stage respectively, and the vertical maximum deformation value of the steel pipe, the maximum horizontal displacement value of the top of the steel pipe, the maximum stress value of the steel pipe and the maximum unilateral fulcrum counterforce are obtained by software. In the supporting stage, wind load on the side surface of the steel box girder is loaded on the top cross beam of the bracket in a form of concentrated force, so that the influence of the wind load on the bracket is considered. In addition, the connection mode and the stress transmission of the bracket and the steel box girder are considered, so that the overall performance and the stability of the bracket and the steel box girder are ensured.
Wherein, the vertical maximum deformation of the support steel pipe is less than H/400; the maximum horizontal displacement of the top of the support steel pipe is less than H/500; the maximum normal stress of the support steel pipe is less than [ sigma ]; the maximum shear stress of the support steel pipe is less than tau. Wherein H is the span of the steel pipe, [ sigma ] is the design value of tensile strength, compressive strength and bending strength of the steel structure, and [ tau ] is the design value of shear strength of the steel structure.
Further, the pushing device in step S02 is a structural part assembly of a three-dimensional adjuster, and includes a jacking cylinder, a longitudinal pushing cylinder and a transverse pushing cylinder. The stainless steel plate is arranged on the welded top surface of the base, the tetrafluoro plate is arranged below the base, the plate surface faces downwards and is contacted with the pushing slide way, and after the pushing slide way is kept clean, the lubricating silicone grease is coated on the pushing slide way.
Further, the correcting step in step S06 specifically includes the following steps:
the steel box girder has a certain curve on the flat and vertical planes, and the pushing route needs to be subjected to curve compensation, so that the contact position of the walking type pushing equipment on each temporary pier and the steel box girder and the elongation of the vertical jacking cylinder need to be monitored in real time in the whole pushing process, the top edge of the pushing equipment is required to be ensured not to exceed the bottom edge of the steel box girder, the transverse position adjustment and the increase and decrease of the vertical cushion blocks are timely carried out, and the good contact and the stressed position of the walking type pushing equipment and the bottom surface of the box girder are ensured.
In the sliding construction process, the total station is utilized to carry out construction measurement on the node process, the difference between the actual deflection value and the theoretical value is checked, and because the two ends of the pushed beam body have a certain curvature radius, when the axis deviation of the corresponding beam body exceeds a preset value, correction is needed, and synchronous adjustment is carried out by utilizing the transverse pushing oil cylinder of the walking type equipment, so that the accuracy in place is ensured. Meanwhile, the horizontal displacement in the pushing process is required to be monitored and adjusted so as to ensure the stability and balance of the steel box girder in the pushing process. In addition, careful analysis and monitoring are required to be carried out on the condition of each temporary pier, and particularly in the process of curve compensation, the relative positions of pushing equipment and a steel box girder are required to be adjusted in time according to actual conditions, so that the smooth pushing construction is ensured.
And calculating friction force according to the fulcrum reaction force of the working condition and verifying the friction force with the oil pressure gauge. When the maximum friction force is greater than the horizontal component force of the steel box Liang Zongpo% of the total weight, the square can be pushed safely. Meanwhile, the total pushing horizontal force and the horizontal component force of the longitudinal slope of the steel box girder also need to be calculated and analyzed in detail, so that the pushing system can work stably and reliably under different working conditions.
When pushing the final beam section, the user needs to pay special attention to whether the beam section reaches the design position or not, the final position needs to be pushed at night with stable temperature, and the length of the beam needs to be carefully calculated and measured according to the temperature. And small stroke point movement is adopted in the last pushing so as to correct the deviation and longitudinally move in place. After the beam section reaches the design position, final inspection and confirmation is required, and meanwhile, any accidents or damages to the steel box girder during beam falling are avoided.
Example 2:
Referring to fig. 1-3, as shown in fig. 1-2, the invention provides a multi-point curve pushing method for a steel structure bridge, a pushed steel box girder 3 is 83 m long, 10.5 m wide and 600 tons in weight, six pushing devices 1 are arranged in total, each device can bear 400 tons of force at most, and hand-changing supports 2 are erected on two longitudinal sides of each pushing device. The setting comprises the following steps:
And S1, simulating a pushing route of the steel box girder 3. According to the complex topography of a public road bridge, various topography and topography can be avoided before pushing, the route simulation method is that the collision detection and construction simulation are carried out on the pushed steel box girder 3 through parameterized three-dimensional design software Solidworks before pushing, and particularly the working conditions of pushing the steel box girder and the guide girder to the bridge pier are simulated, so that the pushed route is ensured to have no interference with the environment and topography;
Step S2: a pushing support, pushing equipment 1 and a pushing auxiliary structure are erected. As shown in fig. 1-2, the pushing mode is multi-point pushing, and each supporting frame is provided with pushing equipment 1; as shown in fig. 3, 4 and 5, the pushing support is erected below the steel box girder 3, hardened on the ground to form an enlarged foundation 5, a plurality of steel pipe supports are arranged, a plurality of cross beams and longitudinal beams 4 are arranged on the steel pipe supports, and the walking type pushing equipment 1 and the hand-changing support 2 are further arranged. The bottom surface of the pushed beam body has a certain slope and changes along the length direction, so the upper part of the walking type pushing equipment 1 is provided with an equalizing beam 6 and a cushion block is placed according to the line type of the bottom surface of the beam body. The 10mm rubber sheet is placed on the cushion block, so that the friction force born by the steel box girder 3 can be increased when the paint on the surface of the steel box girder 3 is protected, and the steel box girder 3 cannot slide when being pushed. The cushion block adopts a plurality of blocks of combination type and has certain elastic self-adaptive compression quantity, and when the elastic adjustment range is exceeded, the corresponding steel cushion block is increased or decreased in time according to the actual condition so as to ensure that all points are stressed simultaneously.
The structure is analyzed by adopting finite element analysis software Midas/Civil, and the strength, the deformation and the stability of the pushing support in the loaded state are analyzed through the pushing lifting stage, the pushing carrying stage and the supporting stage respectively, and the vertical maximum deformation value of the steel pipe, the maximum horizontal displacement value of the top of the steel pipe, the maximum stress value of the steel pipe and the maximum unilateral fulcrum counterforce are obtained by software. In the support stage, wind load is applied to the side surface of the steel box girder 3 and is loaded on the top cross beam of the bracket in a form of concentrated force.
Wherein the vertical maximum deformation of the support steel pipe is less than H/400; the maximum horizontal displacement of the top of the support steel pipe is less than H/500; the maximum normal stress of the support steel pipe is less than [ sigma ]; the maximum shear stress of the support steel pipe is less than tau. Wherein H is the span of the steel pipe, [ sigma ] is the design value of tensile strength, compressive strength and bending strength of the steel structure, and [ tau ] is the design value of shear strength of the steel structure.
As shown in fig. 6-8, the pushing device 1 is a three-dimensional adjusting machine structure part assembly, and comprises a jacking cylinder 7 and longitudinal and transverse pushing cylinders 8. The stainless steel plate is arranged on the welded top surface of the base, the tetrafluoro plate is arranged below the base, the plate surface faces downwards and is contacted with the pushing slide way 9, and after the pushing slide way 9 is kept clean, the lubricating silicone grease is coated.
Step S3: starting a hydraulic pump station to synchronously jack up the steel box girder 3 by the jacking oil cylinders 7 in the walking type pushing equipment 1, and observing the elongation of each oil cylinder to ensure that the whole pushing process is always at a safe gradient;
Step S4: and (4) continuously observing from the beginning of the force application, stopping the force application immediately once the maximum supporting reaction force of a certain top is larger than 2000kN, and readjusting the pushing force of each pushing device 1.
Step S5: stopping the jacking cylinder 7, and synchronously pushing the pushing cylinder 8 forward for a stroke, namely, pushing the steel box girder 3 forward for 500mm;
Step S6: stopping the pushing cylinder 8, retracting the jacking cylinder 7, and enabling the pushed steel box girder 3 to fall on the temporary hand-changing support 2 to correct the position to be corrected in time; the steel box girder 3 has a certain curve on the flat and vertical planes, the pushing route needs to be subjected to curve compensation, namely, after longitudinal pushing, a small section needs to be pushed transversely, meanwhile, the outer arc is more than one point, and the inner arc is less than one point, so that the curve pushing effect is achieved. Therefore, in the whole pushing process, the contact position of the walking type pushing device 1 on each temporary pier and the steel box girder 3 needs to be monitored in real time, the top edge of the pushing device 1 is required to be prevented from exceeding the bottom edge of the steel box girder 3, the elongation of the vertical jacking cylinder 7 is required to be monitored, the safety gradient during pushing is ensured, the transverse position adjustment and the increase and decrease of the vertical cushion blocks are timely carried out, and the good contact and the stressed position of the walking type pushing device 1 and the bottom surface of the box girder are ensured.
In the sliding construction process, the total station is utilized to carry out construction measurement on the node process, the gap between the actual deflection value and the theoretical value of the steel box girder 3 and the guide girder is checked, and as the two ends of the pushed girder have a certain curvature radius, when the axis deviation of the corresponding girder body exceeds a preset value, correction is needed, and synchronous adjustment is carried out by utilizing the transverse pushing oil cylinder 8 of the walking type equipment, so that the accuracy in place is ensured. Meanwhile, the horizontal displacement in the pushing process is required to be monitored and adjusted so as to ensure the stability and balance of the steel box girder 3 in the pushing process. In addition, the situation on each temporary pier needs to be carefully analyzed and monitored, and particularly in the process of curve compensation, the relative positions of the pushing equipment 1 and the steel box girder 3 need to be timely adjusted according to actual situations, so that the pushing construction is ensured to be smoothly carried out.
And calculating friction force according to the fulcrum reaction force of the working condition and verifying the friction force with the oil pressure gauge. When the maximum friction force is greater than the horizontal component force of the longitudinal slope of the steel box girder 3 which is 5% of the total weight, the steel box girder can be pushed safely. Meanwhile, the total pushing horizontal force and the horizontal component force of the longitudinal slope of the steel box girder also need to be calculated and analyzed in detail, so that the pushing system can work stably and reliably under different working conditions.
Step S7: and (3) retracting the pushing cylinder 8, and repeating the steps S03 to S06 until the pushed steel box girder is pushed to the installation position. When pushing the final beam section, the user needs to pay special attention to whether the beam section reaches the design position or not, the final position needs to be pushed at night with stable temperature, and the length of the beam needs to be carefully calculated and measured according to the temperature. And small stroke point movement is adopted in the last pushing so as to correct the deviation and longitudinally move in place.
Claims (10)
1. The multipoint curve pushing method for the steel structure bridge is characterized by comprising the following steps of:
s01: simulating a pushing route of the steel box girder (3), and calculating an allowable value of the deviation of the central axis in the pushing process;
s02: erecting a pushing support, pushing equipment (1) and a pushing auxiliary structure thereof;
S03: starting a hydraulic pump station to enable a jacking cylinder (7) in the walking type pushing equipment (1) to synchronously jack up the steel box girder (3), and monitoring the oil top elongation of the jacking cylinder (7) to ensure the safety gradient during pushing;
S04: continuously observing from the beginning of force application, stopping force application immediately once the maximum counter force of a single pushing device (1) is higher than a preset value, and readjusting the pushing force of each pushing device (1);
s05: stopping the jacking oil cylinder (7), synchronously pushing the pushing oil cylinder (8) forwards by a stroke distance L, wherein the forward pushing distance of the steel box girder (3) is L;
s06: stopping the pushing oil cylinder (8), retracting the jacking oil cylinder (7), and enabling the pushed steel box girder (3) to fall on the temporary hand-changing support (2) to correct the position to be corrected in time;
S07: and (3) retracting the pushing cylinder (8), and repeating the steps S03 to S06 until the pushed steel box girder (3) is pushed to the installation position.
2. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: the route simulation method in the S01 is that before pushing, collision detection and construction simulation are carried out on the pushed steel box girder (3) through parameterized three-dimensional design software Solidworks, an allowable value of axis deviation is obtained, and the pushed route is ensured to have no interference with the environment and the topography.
3. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: in S02, pushing supports are erected below the steel box girder (3), hardening is carried out on the ground to form an enlarged foundation (5), a plurality of steel pipe supports are arranged, a plurality of cross beams and longitudinal beams (4) are arranged on the steel pipe supports, and walking pushing equipment (1) and a hand-changing support (2) are arranged.
4. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: the bottom surface of the pushed beam body transversely has a certain slope and changes along the length direction, based on the slope, an equalizing beam (6) is arranged on the upper part of the walking type pushing equipment (1), a cushion block is placed according to the line type of the bottom surface of the beam body, a rubber sheet is placed on the cushion block, the paint on the surface of the steel box beam (3) is further protected, and meanwhile, the friction force borne by the steel box beam (3) is increased, so that the steel box beam (3) cannot slide when being pushed.
5. The multi-point curve pushing method for the steel structure bridge, as claimed in claim 4, is characterized in that: the cushion block adopts a plurality of blocks of combination type and has certain elastic self-adaptive compression quantity, and when the elastic adjustment range is exceeded, the corresponding steel cushion block is increased or decreased in time according to actual conditions so as to ensure that all points are stressed simultaneously.
6. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: the pushing support stress analysis and calculation method in the S02 is as follows:
analyzing the structure by adopting finite element analysis software Midas/Civil, and analyzing the strength, deformation and stability of the pushing support under the loaded state through a pushing lifting stage, a pushing carrying stage and a supporting stage respectively, wherein the vertical maximum deformation value of the steel pipe, the maximum horizontal displacement value of the top of the steel pipe, the maximum stress value of the steel pipe and the maximum unilateral fulcrum counterforce are obtained by software; in the support stage, wind load on the side surface of the steel box girder (3) is loaded on a cross beam at the top of the bracket in a form of concentrated force;
wherein, the vertical maximum deformation of the support steel pipe is less than H/400; the maximum horizontal displacement of the top of the support steel pipe is less than H/500; the maximum normal stress of the support steel pipe is less than [ sigma ]; the maximum shear stress of the support steel pipe is less than tau, wherein H is the span of the steel pipe, sigma is the design value of tensile strength, compressive strength and bending strength of the steel structure, and tau is the design value of the shear strength of the steel structure.
7. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: the pushing device (1) is a three-dimensional adjusting machine structure part assembly and comprises a jacking cylinder (7) and longitudinal and transverse pushing cylinders (8); the stainless steel plate is arranged on the welding top surface of the base, the tetrafluoro plate is arranged below the base, the plate surface faces downwards and is contacted with the pushing slide way (9), and after the pushing slide way (9) is kept clean, the lubricating silicone grease is coated.
8. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: the correcting step specifically comprises the following steps:
The steel box girder (3) has a certain curve on a flat plane and a vertical plane, the pushing route needs to be subjected to curve compensation, based on the curve compensation, the contact position of the walking type pushing equipment (1) on each temporary pier and the steel box girder (3) needs to be monitored in real time in the whole pushing process, the top edge of the pushing equipment (1) is ensured not to exceed the bottom edge of the steel box girder (3), the elongation of the vertical jacking cylinder (7) also needs to be monitored, the safe gradient during pushing is ensured, the transverse position adjustment and the increase and decrease of the vertical cushion blocks are timely carried out, and the good contact and the stress position of the walking type pushing equipment (1) and the bottom surface of the box girder are ensured;
In the sliding construction process, the total station is utilized to carry out construction measurement on the node process, the gap between the actual deflection value and the theoretical value is checked, and as the two ends of the pushed beam body have a certain curvature radius, when the axis deviation of the corresponding beam body exceeds a preset value, correction is needed, and synchronous adjustment is carried out by utilizing the transverse pushing oil cylinder (8) of the walking type equipment, so that the accuracy in place is ensured.
9. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: and calculating friction force according to fulcrum reaction force of working conditions, verifying with an oil pressure gauge, and safely pushing when the maximum friction force is greater than the horizontal component force of the longitudinal slope of the steel box girder (3) with the total weight by 5 percent.
10. The multi-point curve pushing method of the steel structure bridge according to claim 1, wherein the method comprises the following steps: when pushing the final beam section, the user needs to pay special attention to whether the beam section reaches the designed position or not, the final position needs to be pushed at night with stable temperature, the length of the beam is carefully calculated and measured according to the temperature, and small stroke point movement is adopted when pushing the final beam section for correction and longitudinal movement in place.
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| CN118345718A (en) * | 2024-06-17 | 2024-07-16 | 武汉市汉阳市政建设集团有限公司 | Steel box girder pushing construction method for overpass crossing urban expressway |
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| CN118345718A (en) * | 2024-06-17 | 2024-07-16 | 武汉市汉阳市政建设集团有限公司 | Steel box girder pushing construction method for overpass crossing urban expressway |
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