Construction technology of steel-concrete continuous beam bridge with walking-type top-pushing steel box beam

Abstract

The present application relates to a steel-concrete continuous beam bridge construction process with a walking-type jacking steel box girder, which includes the following steps: S1, temporary pier platform erection; S2, jacking equipment debugging: using pre-pressing to debug the hydraulic jacking device; S3, guide beam assembly: using steel profiles to assemble the guide beam in sections on the temporary pier platform; S4, steel box girder assembly; S5, back-support truss installation; S6, jacking: using a hydraulic jacking device to jack the initial section of the steel box girder and the guide beam, and after the jacking is completed, the steel box girder of the next section is assembled at the end of the steel box girder away from the guide beam, and then the steps of jacking and assembling the steel box girder are repeated, so that the front end of the guide beam is overlapped on the end construction platform, and finally the guide beam and the back-support truss are removed, and the assembly and installation of the steel box girder at the end of the construction is completed on the end construction platform; S7, casting. The present application can reduce the impact of excessive deflection of the guide beam on the installation without affecting the use of the existing road.

Description

Technical Field

[0001] The present application relates to the field of bridge steel box girder jacking technology, and in particular to a steel-concrete continuous beam bridge construction process with a walking-type jacking steel box girder. Background Art

[0002] Steel-concrete box girder is a new type of bridge construction structure. It is widely used because of its light weight, convenient node structure, fast construction and small amount of concrete. Its main structure includes steel box girder that plays the role of support and formwork and concrete structure poured inside the steel box girder.

[0003] At present, steel box girders mainly include a bottom plate, a middle partition, a top plate, a side partition, a web plate and an outer anchor box made of steel components. The middle partition and the side partition are parallel to each other and are distributed in a direction perpendicular to the plate surface. The upper edges of the middle partition and the side partition are fixedly connected to the top plate, and the lower edges of the middle partition and the side partition are fixedly connected to the bottom plate. The web plate is fixedly connected to the side edges of the top plate and the bottom plate to form a box-like structure, and the outer anchor box is fixedly connected to the outer wall of the web plate away from the top plate and the bottom plate for lifting and anchoring.

[0004] During the construction process, since the structure of the steel box girder is relatively heavy, there are currently two main methods for installing the steel box girder on the bridge pier. The first method is to use lifting equipment on the side of the road to transport the materials to the brackets on the bridge pier for assembly and welding to form a steel box girder, and then pour concrete to form a steel-concrete continuous beam. However, this construction method is only suitable for areas where it is convenient to form a construction access road. If it is located in a mountainous area or a river, the lifting equipment cannot be gradually constructed along with the bridge. The second method is to install a construction platform on the completed abutment or road, and install multiple temporary piers between the piers, then assemble the guide beam first, and finally push the guide beam and the partially manufactured steel box girder toward the pier through the hydraulic jacking device set on the construction platform and the temporary pier, so as to complete the installation of the steel box girder in areas such as rivers where it is not convenient to build temporary roads; finally, pour concrete on the steel box girder in sections.

[0005] In the actual construction process, different construction situations will be faced, especially when urban roads cross tracks or existing roads, resulting in the existing tracks or roads being located between two adjacent bridge piers. At this time, it is not convenient to construct temporary piers between the bridge piers, so that the guide beam and the steel box beam will have a relatively long section without temporary pier support, which will cause the guide beam and the front end of the steel box beam to have relatively large deflection during the jacking process. At this time, it is necessary to set up lifting equipment on the existing road when the guide beam is close to the end of the construction section, and set the guide beam on the hydraulic jacking device on the bridge pier or temporary pier at the end of the construction section to complete the construction of the steel box beam. However, the use of temporary lifting equipment will still interfere with the normal use of the existing road. Summary of the invention

[0006] In order to complete the installation of a large-span guide beam without interfering with the operation of existing roads, the present application provides a steel-concrete continuous beam bridge construction process with a walking-type jacking steel box beam.

[0007] The present application provides a steel-concrete continuous beam bridge construction process with a walking-type top-pushing steel box beam, which adopts the following technical solution:

[0008] A construction process for a steel-concrete continuous beam bridge with a walking-type jacking steel box beam comprises the following steps: S1, erecting a temporary pier platform: assembling a temporary pier platform with steel trusses at the abutment of the initial construction section, and installing a hydraulic jacking device and a cushion beam for jacking a guide beam and a steel box beam on the top of the temporary pier platform, and simultaneously assembling at the abutment at the end of the construction to form an end construction platform for temporarily bridging the guide beam and the steel box beam, and the end construction platform is also provided with a hydraulic jacking device and a cushion beam;

[0009] S2. Debugging of jacking equipment: Debug the hydraulic jacking device by preloading;

[0010] S3, guide beam assembly: steel profiles are assembled in sections on the temporary pier platform to form a guide beam;

[0011] S4, steel box girder assembly: Use hoisting or completed construction roads to assemble the middle diaphragm, side diaphragm, top plate, bottom plate, web plate and outer anchor box of the steel box girder on the temporary pier platform to complete the assembly of the initial section of the steel box girder, and fix the initial section of the steel box girder to the end of the guide beam;

[0012] S5. Back-support truss installation: The back-support truss is formed by assembling steel profiles, and the back-support truss is located above the connection between the guide beam and the steel box beam. The back-support truss is fixedly connected to the tail of the guide beam by bolts, and the back-support truss is fixedly connected to the steel box beam of the initial section by a fixing assembly;

[0013] S6. Pushing: Use a hydraulic pusher to push the steel box girder and guide beam of the initial section. After the pushing is completed, assemble the steel box girder of the next section at the end of the steel box girder away from the guide beam, and make the center of gravity of the steel box girder and the guide beam always located on the temporary pier platform. Then repeat the steps of pushing and assembling the steel box girder, so that the front end of the guide beam overlaps the end construction platform. Finally, remove the guide beam and back-supporting truss, and complete the assembly and installation of the steel box girder at the end of the construction on the end construction platform.

[0014] S7. Casting: Concrete is cast in layers and intervals in multiple interconnected steel box girders to form a steel-concrete continuous beam, and then the bridge deck is cast on the top surface of the steel box girder.

[0015] By adopting the above technical scheme, during the pushing process of the guide beam and the steel box beam, the stability of the connection between the guide beam and the steel box beam can be further optimized through the back-support truss. At the same time, the front end of the guide beam can be structurally strengthened through the back-support truss to reduce the deflection caused by the large span. Therefore, under the premise of not constructing temporary piers on the existing road, the pushing of the guide beam can still be completed, and the installation of the large-span guide beam can be realized.

[0016] Optionally, the terminal construction platform includes a construction support fixedly connected to the ground, a construction slide seat vertically slidably connected to the outer wall of the construction support on one side facing the temporary pier platform, and a support platform arranged on the construction slide seat. The hydraulic jack of the terminal construction platform is arranged on the top of the construction support. The top of the construction support and the upper end surface of the construction slide seat are fixedly connected with construction guide rails which are parallel to each other and whose sliding paths overlap. The support platform is slidably arranged on at least one of the construction guide rails. The construction support is fixedly connected with a lifting member for lifting the construction slide seat. The support platform is used to temporarily support the guide beam. or steel box girder; in step S6, when the end of the guide beam away from the steel box girder is pushed to the top of the support platform, the lifting member lifts the construction slide so that the end of the guide beam is placed on the support platform and lifts the end of the guide beam, so that the end of the guide beam is flush with the top of the hydraulic jacking device, and then the end of the guide beam is pushed to the pushing part of the hydraulic jacking device; and after the guide beam is overlapped with the pushing part of the hydraulic jacking device of the construction support, the support platform can also be used as a cushion beam at this time. During the pushing process of the guide beam and the steel box girder, when the pushing part of the hydraulic jacking device on the construction support moves down, the guide beam and the steel box girder are temporarily supported.

[0017] By adopting the above technical scheme, since the back-supporting truss can only be used to connect the guide beam and the steel box beam of the initial section, the large span will also cause relatively large deflection of the guide beam and multiple steel box beams. During the jacking process of the guide beam and the steel box beam, the front end of the guide beam will first be located above the construction slide and the support platform. At this time, the construction slide is lifted by the lifting member so that the front end of the guide beam overlaps the support platform, and after the top of the construction slide is flush with the top of the construction support, during the jacking process of the guide beam, due to the deflection of the guide beam and the steel box beam, the guide beam will still overlap the support platform, and push the support platform from the construction guide rail on the construction slide to the construction guide rail on the construction support, thereby completing the jacking of the large-span guide beam and the steel box beam without interfering with the operation of the existing road and the excessive deflection of the guide beam, thereby completing the construction of the steel-concrete continuous beam bridge.

[0018] Optionally, the lifting member includes a winch fixedly connected to the construction support, a lifting pulley and a lifting cable rotatably connected to the top of the construction support, one end of the lifting cable is connected to the lifting end of the winch, and the other end of the lifting cable is wrapped around the top of the lifting pulley and then extends downward and fixedly connected to the middle or lower part of the construction slide. The construction support is provided with a locking member for slidingly locking the construction slide.

[0019] By adopting the above technical solution, when the front end of the guide beam needs to be lifted, it is only necessary to use the winch to reel in the lifting rope. During this process, the lifting pulley will be used to assist in support and complete the lifting of the construction slide. At the same time, when the construction slide is lifted to be flush with the top of the construction support, the construction slide can be locked by the locking member to optimize the stability of the support platform when sliding.

[0020] Optionally, the locking member includes a locking hydraulic cylinder and a locking pin fixedly connected to the telescopic end of the locking hydraulic cylinder, the locking pin is slidably arranged on the construction slide, the locking hydraulic cylinder is fixedly connected to the construction slide, and the construction support is fixedly connected with a locking tube for cooperating with the locking pin.

[0021] By adopting the above technical solution, when the construction slide needs to be locked for sliding, it is only necessary to control the locking hydraulic cylinder to control the locking pin to extend and insert it into the locking tube.

[0022] Optionally, the construction support is provided with an anti-falling component, and the anti-falling component is used to prevent the construction slide from falling when the winch fails.

[0023] By adopting the above technical solution, the anti-falling device can prevent the construction slide from falling when the lifting rope breaks or the winch fails during the lifting process of the construction slide, so as to further optimize the safety during use, thereby achieving the jacking of large-span guide beams while maintaining relatively good safety.

[0024] Optionally, the anti-fall component includes an anti-fall pin and an anti-fall rope, the middle part of the anti-fall pin is rotatably connected to the construction slide, one end of the anti-fall rope is fixedly connected to the lifting rope, the other end of the anti-fall rope is fixedly connected to an end of the anti-fall pin away from the construction support, the construction support is fixedly connected with an anti-fall rack for clamping the anti-fall pin, and the construction slide is fixedly connected with an anti-fall spring for pushing the anti-fall pin to abut against the anti-fall rack.

[0025] By adopting the above technical solution, during the process of lifting the construction slide, the lifting rope will be subjected to tension, which will pull the anti-fall rope upward and drive the anti-fall pin to disengage from the anti-fall rack; when the winch fails or the lifting rope breaks, the restriction on the anti-fall rope is cancelled. At this time, the anti-fall pin will be stuck on the anti-fall rack under the action of the anti-fall spring, thereby completing the anti-fall treatment of the construction slide.

[0026] Optionally, the support platform is provided with an injection component for spraying lubricant onto the construction guide rail during sliding, the injection component includes a delivery pipe fixedly connected to the support platform on the side of the hydraulic jack on the construction support and an oil storage tank for providing lubricant to the delivery pipe, and the delivery pipe is provided with an injection control component for pushing the lubricant in the delivery pipe to be sprayed toward the construction guide rail during sliding of the support platform.

[0027] By adopting the above technical solution, when the support platform slides along the construction guide rail, the injection control component will intermittently transport the lubricant in the oil storage tank to the delivery pipe and spray it on the construction guide rail to reduce the resistance of the sliding of the support platform, thereby reducing the possibility of the guide beam bending due to excessive resistance when the support platform slides.

[0028] Optionally, the injection control component includes an injection pipe and an injection plate slidably arranged on the inner wall of the delivery pipe, an injection chamber is formed in the injection plate and the injection pipe, the oil storage tank and the end of the delivery pipe facing the oil storage tank are connected to the injection chamber through a one-way valve, the flow directions of the two one-way valves are opposite, and the flow direction of the one-way valve connected to the oil storage tank is toward the injection chamber, and the injection pipe is provided with a driving component for intermittently controlling the reciprocating sliding of the injection plate.

[0029] By adopting the above technical scheme, in the process of the driving member controlling the reciprocating motion of the injection plate, the one-way valve connecting the injection chamber to the oil storage tank will hinder the lubricant from flowing out of the injection pipe. At the same time, the one-way valve connecting the injection chamber to the delivery pipe can allow the lubricant in the injection pipe to flow to the delivery pipe when being squeezed. Therefore, when the injection plate reciprocates, the lubricant in the oil storage tank can be intermittently sucked in and squeezed into the delivery pipe, thereby realizing intermittent injection of lubricant to reduce the waste of lubricant. At the same time, through the process of the support platform abutting against the construction guide rail and sliding, the lubricant is relatively evenly applied to the construction guide rail, thereby realizing pulsed injection of lubricant.

[0030] Optionally, the driving member includes a driving rod, a driving gear rotatably connected to the driving rod, and two driving racks, the two driving racks are respectively fixedly connected to two construction guide rails, and the driving gear is meshed with one of the driving racks, the driving rod coaxially enters and exits the conveying pipe and is fixedly connected to the injection plate, the rotation plane of the driving gear is parallel to the driving rod, and an injection spring for pushing the injection plate to slide is provided at one end of the injection plate away from the injection chamber.

[0031] By adopting the above technical solution, when the support platform slides along the construction guide rail, the injection spring will push the injection plate and the driving rod to slide toward the driving rack, and because there will be a certain amount of floating when the driving gear rolls along the driving rack, the injection plate will be driven to reciprocate through the driving rod to realize the pulsed injection of lubricant.

[0032] Optionally, the fixing assembly includes a fixing beam and fixing bolts passing through the fixing beam and the back-supporting truss, and the edge of the outer anchor box is clamped between the lower end surfaces of the fixing beam and the back-supporting truss.

[0033] By adopting the above technical solution, the fixed beam is attached to the outer anchor box of the steel box beam, so that the back-supporting truss is connected to the steel box beam without causing structural damage to the steel box beam. In addition, the fixed beam is attached to the outer anchor box of the steel box beam, which can effectively increase the force-bearing area of ​​the outer anchor box of the steel box beam, thereby reducing the possibility of deformation of the steel box beam due to local stress concentration during the jacking process.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. During the jacking process of the guide beam and the steel box beam, the stability of the connection between the guide beam and the steel box beam can be further optimized through the back-support truss. At the same time, the front end of the guide beam can be structurally strengthened through the back-support truss to reduce the deflection caused by the large span. Therefore, the jacking of the guide beam can still be completed without constructing temporary piers on the existing road, and the installation of the large-span guide beam can be realized;

[0036] 2. During the jacking process of the guide beam and the steel box beam, since the back-supporting truss can only be used to connect the guide beam with the steel box beam of the initial section and the span is too large, it will also cause relatively large deflection of the guide beam and multiple steel box beams. During the jacking process of the guide beam and the steel box beam, the front end of the guide beam will first be located above the construction slide and the support platform. At this time, the construction slide is lifted by the lifting member so that the front end of the guide beam overlaps the support platform, and after the top of the construction slide is flush with the top of the construction support, during the jacking process of the guide beam, due to the deflection of the guide beam and the steel box beam, the guide beam will still overlap the support platform, and push the support platform from the construction guide rail on the construction slide to the construction guide rail on the construction support, thereby completing the jacking of the large-span guide beam and the steel box beam without interfering with the operation of the existing road and the excessive deflection of the guide beam, thereby completing the construction of the steel-concrete continuous beam bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flowchart of the construction process of the embodiment of the present application.

[0038] Figure 2 It is a schematic diagram of the installation structure of the guide beam, steel box beam and back-support truss according to the embodiment of the present application.

[0039] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0040] Figure 4 It is a first structural schematic diagram of the terminal construction platform in an embodiment of the present application.

[0041] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of part B.

[0042] Figure 6 yes Figure 4 Schematic diagram of the enlarged structure of part C.

[0043] Figure 7 It is a second structural schematic diagram of the terminal construction platform in the embodiment of the present application.

[0044] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of part D.

[0045] Fig. 9 yes Figure 7 Schematic diagram of the enlarged structure of part E in the middle.

[0046] Fig.10 It is a partial cross-sectional structural schematic diagram of the end construction platform in the embodiment of the present application, which is used to show the structure of the injection component and the injection control component.

[0047] Description of the accompanying drawings: 1. guide beam; 2. steel box beam; 3. back support truss; 31. support truss; 32. support beam; 4. fixing assembly; 41. fixing beam; 42. fixing bolt; 5. construction support; 50. construction slide rail; 51. construction guide rail; 52. lifting member; 521. winch; 522. lifting pulley; 523. lifting rope; 53. anti-falling member; 531. anti-falling pin; 532. anti-falling rope; 533. anti-falling spring; 54. anti-falling rack; 6. construction slide seat; 601. support seat; 602 , construction guide plate; 603, diagonal bracing beam; 61, locking member; 611, locking hydraulic cylinder; 612, locking pin; 613, locking tube; 7, supporting platform; 71, injection member; 711, delivery pipe; 712, oil storage tank; 72, injection control member; 721, injection pipe; 722, injection plate; 723, injection chamber; 724, one-way valve; 73, driving member; 731, driving rod; 732, driving gear; 733, driving rack; 734, injection spring; 74, supporting top seat; 741, electromagnet. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-10 This application is described in further detail.

[0049] The present application embodiment discloses a steel-concrete continuous beam bridge construction process for a walking-type top-pushing steel box beam. Figure 1 and Figure 2 , the construction process includes the following steps:

[0050] S1. Temporary pier platform erection: A temporary pier platform is formed by assembling steel trusses at the abutments of the initial construction section. The temporary pier platform is fixed to the ground through a plurality of pile foundations cast on the side of the abutments facing the existing road. After the construction of the temporary pier platform is completed, a hydraulic jacking device and a cushion beam for jacking the guide beam 1 and the steel box beam 2 are installed on the top of the temporary pier platform, and the hydraulic jacking device and the cushion beam are distributed at intervals. Simultaneously, an end construction platform for temporarily lap-joining the guide beam 1 and the steel box beam 2 is assembled at the abutment at the end of the construction, and a hydraulic jacking device and a cushion beam are also provided on the top of the end construction platform for jacking the guide beam 1 and the steel box beam 2. Among them, the temporary pier platform and the end construction platform are distributed along the length direction of the bridge to be constructed.

[0051] S2. Debugging of jacking equipment: The hydraulic jacking device is debugged by pre-loading, that is, a counterweight block is pre-loaded on the top of the hydraulic jacking device to detect whether the performance of the hydraulic jacking device is normal, so as to replace it in advance and reduce the possibility of failure of the hydraulic jacking device during use.

[0052] S3. Guide beam assembly: Steel profiles are used to assemble the guide beam 1 in sections on the temporary pier platform. The guide beam 1 is a steel truss structure. The outline of the guide beam 1 along the direction perpendicular to the length is trapezoidal and the small end faces the terminal construction platform, so that the guide beam 1 can be relatively conveniently erected on the terminal construction platform under the premise of having a certain deflection.

[0053] S4, assembly of steel box beams: Use hoisting or completed construction roads to assemble the middle partition, side partition, top plate, bottom plate, web plate and outer anchor box of the steel box beam 2 of the initial section on the temporary pier platform and fix them by welding, and then fix the initial section of the steel box beam 2 to the large end of the guide beam 1.

[0054] The middle partition is located between the two side partitions, and multiple middle partitions and side partitions are distributed along the length direction of the guide beam 1. The multiple middle partitions and side partitions are parallel to each other. The upper edges of the middle partition and the side partitions are welded to the lower plate surface of the top plate, and the lower edges of the middle partition and the side partitions are welded to the bottom plate. There are two webs, and the two webs are respectively welded to the side edges of the top plate and the bottom plate and the middle partition and the side partition. Then, the two outer anchor boxes are fixedly connected to the outer walls on the opposite sides of the two webs by bolts or welding, so as to complete the assembly of the steel box girder 2 and form a chamber for pouring concrete inside the steel box girder 2.

[0055] After the steel box girder 2 is assembled, primer and intermediate paint are applied to the inner wall and the inner wall of the steel box girder 2 in sequence. For example, the outer wall is coated with 40 micron epoxy zinc-rich anti-rust primer, 40 micron micaceous iron epoxy intermediate paint and 35 micron fluorocarbon topcoat applied to the outermost side; the inner wall is coated with two layers of 40 micron acrylic aliphatic polyurethane topcoat in sequence.

[0056] S5, back-support truss installation: The back-support truss 3 is formed by assembling steel profiles, and the back-support truss 3 is located above the connection between the guide beam 1 and the steel box beam. The back-support truss 3 is fixedly connected to the tail of the guide beam 1 by bolts, and the back-support truss 3 is fixedly connected to the steel box beam of the initial section by the fixing assembly 4. The lateral profile of the back-support truss 4 is an isosceles trapezoid, and the large ends are respectively connected to the guide beam 1 and the steel box beam 2.

[0057] Reference Figure 2 and Figure 3 The back-supporting truss 3 includes a supporting truss 31 and two supporting beams 32 distributed from top to bottom. The lateral profile of the supporting truss 31 is an isosceles trapezoid. The supporting beam 32 is parallel to the length direction of the guide beam 1, and the supporting beam 32 is fixedly connected to the large end of the supporting truss 31 corresponding to two external anchor boxes, and the end of the supporting beam 32 facing the end construction platform is fixedly connected to the guide beam 1 by bolts, and the end of the supporting beam 32 away from the end construction platform is detachably connected to the external anchor box of the steel box beam 2 through a fixing assembly 4. Among them, a plurality of fixing assemblies 4 are provided and divided into two groups, and the two groups of fixing assemblies 4 are provided corresponding to the two supporting beams 32 one by one.

[0058] The fixing assembly 4 includes a fixing beam 41 and a fixing bolt 42. The fixing beam 41 is located at the lower side of the outer anchor box of the steel box girder 2. The fixing bolt 42 is passed through the fixing beam 41 and the supporting beam 32, and the fixing bolt 42 is located at the side of the outer anchor box of the steel box girder 2 away from the center. The supporting beam 32 and the fixing beam 41 are clamped between the screw head and the nut of the fixing bolt 42, so as to fit the fixing beam 41 to the lower outer wall of the outer anchor box of the steel box girder 2, thereby fixing the back-supporting truss 3 to the steel box girder 2 while reducing damage to the structure of the steel box girder 2. In addition, compared with direct bolt connection, it can also effectively increase the force-bearing area of ​​the steel box girder 2 when a load is applied to the steel box girder 2, so as to reduce the possibility of deformation of the steel box girder due to force.

[0059] S6. Pushing: Use a hydraulic pusher to push the initial section of the steel box girder 2 and the guide beam 1. After the pushing is completed, assemble the next section of the steel box girder 2 at the end of the steel box girder 2 away from the guide beam 1, and make the center of gravity of the steel box girder 2 and the guide beam 1 always located on the temporary pier platform, then repeat the steps of pushing and assembling the steel box girder 2, so that the front end of the guide beam 1 overlaps the end construction platform, finally remove the guide beam 1 and the back-supporting truss 3, and complete the assembly and installation of the steel box girder 2 at the end of the construction on the end construction platform.

[0060] The specific jacking action is as follows: the jacking part of the hydraulic jacking device lifts the guide beam 1, the steel box beam 2 and the back-supporting truss 3, and then the hydraulic jacking device controls the jacking part to slide along the length direction of the guide beam 1 toward the end construction platform, and makes the guide beam 1 and the steel box beam 2 located above the cushion beam. Thereafter, a pad is placed above the cushion beam, and the jacking part of the hydraulic jacking device is lowered, and the guide beam 1 and the steel box beam 2 are temporarily supported on the pad on the cushion beam. Finally, the jacking part of the hydraulic jacking device retracts, and the next section of the steel box beam 2 is assembled and fixed at the end of the steel box beam 2 away from the guide beam 1, so as to complete a jacking cycle action of the guide beam 1 and the steel box beam 2.

[0061] S7, pouring: pouring concrete in layers and intervals in a plurality of mutually spliced ​​steel box girders 2 to form a steel-concrete continuous beam, and then completing the pouring of the bridge deck on the top surface of the steel box girder 2.

[0062] The specific steps are as follows:

[0063] The guide beam 1 is removed, and after the steel box beam 2 is pushed and welded, the steel box beam 2 is connected to the two completed abutments, and the end construction platform and the temporary pier platform are removed, and then the stress change of the steel box beam 2 is detected.

[0064] After the stress change test is qualified, a rubber strip is installed on the top wall of the top plate of the steel box girder 2 to form a casting cavity on the top plate of the steel box girder 2, and the bottom plate concrete and the partition concrete between the side partitions of two adjacent steel box girders 2 are cast inside the steel box girder 2 at the same time. After the age of the cast concrete reaches seven days and reaches the design strength and elastic modulus, epoxy resin mortar is cast on the top plate of the steel box girder 2 to form a surface layer, and finally a plurality of prefabricated bridge panels are preset at intervals on the upper layer of the steel box girder 2 by hoisting, and then the prefabricated bridge panel notches and cast-in-place wet joints are cast with mortar.

[0065] Reference Figure 4 and Figure 5 The terminal construction platform includes a construction support 5 fixedly connected to the ground through a pile foundation, a construction slide 6 vertically slidably connected to the construction support 5, and a support platform 7 arranged on the construction slide 6. The construction slide 6 is located on the side of the construction support 5 facing the temporary pier platform, so that the guide beam 1 is first located above the construction slide 6 during the process of being pushed.

[0066] The top of the construction support 5 and the top arm of the construction slide 6 are both provided with two mutually parallel construction rails 51, and the construction rails 51 are parallel to the distribution path of the temporary pier platform and the construction support 5. The construction rails 51 on the construction support 5 or the construction slide 6 are clamped and slidably connected to the bottom of the support platform 7. The support platform 7 is a steel truss-like structure and the upper end surface is a plate-like structure, which is used to support the guide beam 1. At the same time, when the construction rails 51 on the construction slide 6 are opposite to the construction rails 51 on the construction support 5, the support platform 7 can slide from the construction slide 6 to the top of the construction support 5 through the construction rails 51.

[0067] Reference Figure 4 and Figure 5 The edge of the construction support 5 facing the construction slide 6 is fixedly connected with two vertically arranged construction slide rails 50, and the construction slide rails 50 are in an I-beam structure. The construction slide 6 includes a horizontally arranged support seat 601 and a construction guide plate 602 fixedly connected to the support seat 601, the construction slide rails 50 are clamped and slidably connected to the construction guide plate 602, and the construction guide plate 602 is fixedly connected to the lower end surface of the support seat 601, and the lower end surface of the support seat 601 is fixedly connected with two inclined diagonal bracing beams 603, and the lower end of the diagonal bracing beam 603 is fixedly connected to the construction guide plate 602, so as to vertically slide and connect the construction slide 6 to the construction support 5.

[0068] In addition, the construction support 5 is provided with a lifting member 52 for lifting the construction slide 6, and the lifting end of the lifting member 52 is connected to the lower end of the construction slide 6, that is, the lifting end of the lifting member 52 is fixedly connected to the lower end of the construction guide plate 602.

[0069] In step S6, the construction slide 6 is located below the top of the construction support 5, and when the small end of the guide beam 1 is pushed to the top of the construction slide 6, the construction slide 6 is lifted by the lifting member 52, so that the small end of the guide beam 1 overlaps the support platform 7, and the small end of the guide beam 1 is lifted to the height of the pushing part of the hydraulic pusher on the construction support 5. Then, during the pushing process, due to the deflection of the guide beam 1, the guide beam 1 is still erected on the support platform 7, and in this process, the support platform 7 is pushed to slide along the construction guide rail 51, and after the support platform 7 reaches the position of the hydraulic pusher, the guide beam 1 can be pushed to the pushing part of the hydraulic pusher, and then the pushing part of the hydraulic pusher on the construction support 5 rises, so that the guide beam 1 is separated from the support platform 7 relative to the support platform 7, completing the pushing of the guide beam 1 on the construction support 5, and in this process, the support platform 7 can be used to temporarily support the guide beam 1 without the need to set up additional pad beams, so that when the guide beam 1 and the steel box beam 2 are pushed over a large span, even if the deflection of the guide beam 1 is too large, the pushing of the guide beam 1 and the steel box beam 2 can still be completed, while reducing the impact on the operation of the existing road.

[0070] Reference Figure 4 and Figure 5 The lifting member 52 includes a winch 521, a lifting pulley 522 rotatably connected to the top of the construction support 5, and a lifting rope 523. One end of the lifting rope 523 is fixed and wound around the lifting end of the winch 521, that is, wound around the hoisting rod of the winch 521. The other end of the lifting rope 523 is wound around the upper end wheel groove of the lifting pulley 522 and is fixedly connected to the lower part of the construction guide plate 602 through a crossbeam. Of course, the lifting rope 523 can also be fixedly connected to the middle part of the construction guide plate 602.

[0071] When the construction slide 6 needs to be lifted, the drawing winch 521 only needs to be wound up, and the construction guide plate 602 and the support seat 601 are pulled upward by the lifting rope 523 to make the support platform 7 extend upward from the construction bracket 5.

[0072] Of course, in other embodiments, the lifting member 52 may also be an electric hoist or a hydraulic cylinder.

[0073] Reference Figure 6 Specifically, the construction support 5 is also provided with a locking member 61 for slidingly locking the construction slide 6. The locking member 61 includes a locking hydraulic cylinder 611 and a locking pin 612 coaxially fixedly connected to the telescopic end of the locking hydraulic cylinder 611. The locking pin 612 is parallel to the construction guide rail 51, and the locking pin 612 is slidingly connected to the support seat 601 through a support pipe fixedly connected to the support seat 601. The cylinder body of the locking hydraulic cylinder 611 is fixedly connected to the support seat 601. Among them, the construction support 5 is fixedly connected with a locking tube 613 for cooperating with the locking pin 612. The locking tube 613 is parallel to the locking pin 612, and the central axis of the locking tube 613 is perpendicular to and intersects with the sliding path of the locking pin 612.

[0074] When the support seat 601 slides to the top of the construction support 5, the locking hydraulic cylinder 611 pushes the locking pin 612 to be inserted into the locking tube 613, so as to provide auxiliary support and sliding locking effect on the support seat 601 during the sliding of the guide beam 1, so as to optimize the stability during use.

[0075] Reference Figure 7 and Figure 8 In order to further optimize the safety and stability during the vertical lifting of the support seat 601, the construction support 5 is also provided with an anti-falling member 53, which is used to prevent the support seat 601 from falling during the lifting process of the support seat 601, thereby reducing the safety hazards caused by the failure of the winch 521 or the breakage of the lifting rope 523.

[0076] Two anti-falling parts 53 are provided, and the two anti-falling parts 53 are fixedly connected to the two construction guides 602 through a fixed shaft. The anti-falling part 53 includes an anti-falling pin 531 and an anti-falling rope 532. The anti-falling pin 531 is rotatably connected to the two construction guides 602 through a fixed shaft. The anti-falling pin 531 is V-shaped and the tip is rotatably connected to the fixed shaft. One end of the anti-falling rope 532 is fixedly connected to the end of the anti-falling pin 531 away from the construction support 5, and the other end of the anti-falling rope 532 is fixedly connected to the lifting rope 523, and the distance between the connection part of the anti-falling rope 532 and the lifting rope 523 and the position where the lifting rope 523 is connected to the construction guide 602 is L1, and the distance between the connection part of the anti-falling rope 532 and the lifting rope 523 and the connection part of the anti-falling rope 532 and the fixed shaft is L2, and L1>L2.

[0077] Reference Figure 7 and Figure 8 The construction support 5 is fixedly connected with an anti-falling rack 54 for clamping the end of the anti-falling pin 531. Two anti-falling racks 54 are provided corresponding to the anti-falling parts 53, and the anti-falling racks 54 are vertically arranged. The minimum distance between the anti-falling pin 531 and the fixed shaft connection part and the anti-falling rack 54 is H1, and the distance between the anti-falling pin 531 and the fixed shaft connection part and the end of the anti-falling pin 531 facing one end of the construction support 5 is H2, and H2 is greater than H1. The construction guide plate 602 is fixedly connected with two anti-falling springs 533 through a horizontal crossbeam, and the anti-falling spring 533 is also fixedly connected to the end of the anti-falling pin 531 facing the construction support 5, so as to push the anti-falling pin 531 to abut against the anti-falling rack 54.

[0078] When in use, the anti-falling rope 532 is lifted synchronously due to the pulling of the lifting rope 523, and at this time, the anti-falling pin 531 is separated from the anti-falling rack 54 to reduce the interference with the vertical lifting process of the construction slide 6. When the winch 521 fails or breaks, the restriction on the anti-falling pin 531 is cancelled. At this time, the anti-falling pin 531 abuts against the anti-falling rack 54 under the action of the anti-falling spring 533, so that the anti-falling pin 531 is clamped, and the anti-falling treatment of the construction slide 6 is realized.

[0079] Of course, in other embodiments, the anti-fall component 53 can also adopt a tension sensor arranged on the lifting cable 523 and an electromagnetic track clamp fixedly connected to the construction slide 6. The tension sensor is used to sense the tension of the lifting cable 523 and send a control signal to control the opening and closing of the electromagnetic track clamp. If the tension detected by the tension sensor during the lifting process is less than the pre-stored value, a control signal is sent to control the electromagnetic track clamp to clamp the anti-fall rack 54 to achieve anti-fall processing.

[0080] Reference Fig. 9 and Fig.10The support platform 7 is also provided with an injection part 71 for injecting lubricant into the construction guide rail 51 during the sliding process, so as to reduce the resistance of the support platform 7 to slide along the construction guide rail 51. Compared with the pre-injection of lubricant, it can also reduce the influence of oxidation and deterioration of the lubricant or adsorption of too much debris on the lubrication effect caused by the outdoor construction, which may be easily caused by the outdoor temperature.

[0081] The injection member 71 includes a delivery pipe 711 and an oil storage tank 712. One end of the delivery pipe 711 is fixedly connected to the outer wall of the support platform 7 on the side of the hydraulic jack on the construction support 5, and the other end of the delivery pipe 711 is fixed and connected to the oil storage tank 712. The oil storage tank 712 is used to provide lubricant for the delivery pipe 711, and the oil storage tank 712 is fixedly connected to the side of the support platform 7. Among them, the delivery pipe 711 is provided with two nozzles corresponding to the two construction guide rails 51, and the delivery pipe 711 is provided with an injection control member 72 for pulse-controlled delivery of lubricant toward the nozzle.

[0082] Reference Fig. 9 and Fig.10 The injection control member 72 includes an injection pipe 721 and an injection plate 722 slidably disposed on the inner wall of the delivery pipe 711, and the injection plate 722 is adapted to the inner wall of the injection pipe 721. The injection pipe 721 is vertically disposed and fixedly connected to the side wall of the support platform 7, and an injection cavity 723 is formed in the injection pipe 721 below the injection plate 722, and the cavity wall of the injection cavity 723 is provided with two check valves 724 connected to the inside. One of the check valves 724 is connected to the oil storage tank 712 through a pipeline, and the flow direction of the check valve 724 connected to the oil storage tank 712 is from the oil storage tank 712 to the injection cavity 723; the other check valve 724 is connected to the delivery pipe 711, and the flow direction of the check valve 724 connected to the delivery pipe 711 is from the injection pipe 721 to the delivery pipe 711.

[0083] Reference Fig. 9 and Fig.10 The injection pipe 721 is provided with a driving member 73 for intermittently controlling the sliding of the injection plate 722. The driving member 73 includes a driving rod 731, a driving gear 732 rotatably connected to the driving rod 731, and two driving racks 733. The driving gear 732 is meshed with the driving rack 733, and the top of the driving gear 732 abuts against the bottom of the driving rack 733, so that the driving gear 732 will intermittently float up and down when rolling along the driving rack 733. Among them, the two driving racks 733 are fixedly connected to the construction guide rail 51 located at the top of the construction support 5 and the construction guide rail 51 of the top arm of the support seat 601 respectively, and the two driving racks 733 are parallel to each other and the extension paths are located on the same straight line.

[0084] One end of the driving rod 731 away from the driving gear 732 coaxially penetrates into the injection tube 721 and is fixedly connected to the injection plate 722. The driving gear 732 is meshed with one of the driving racks 733, and the rotation plane of the driving gear 732 is parallel to the driving rod 731. Among them, the injection plate 722 is provided with an injection spring 734 on the side away from the injection chamber 723 for pushing the injection plate 722 to slide toward the driving gear 732. The injection spring 734 is coaxially arranged in the injection tube 721 and is in a compressed state.

[0085] When the support platform 7 slides relative to the construction guide rail 51, the driving gear 732 will roll along the driving rack 733, and in this process, due to the push of the injection spring 734, the driving gear 732 will float intermittently during the rolling process, thereby driving the injection plate 722 to reciprocate, and in the process of the reciprocating motion of the injection plate 722, the lubricant will be drawn into the injection chamber 723 through the one-way valve 724, and then input into the delivery pipe 711 through another one-way valve 724 to complete the lubrication of the construction guide rail 51, thereby effectively reducing the resistance during sliding.

[0086] Reference Fig. 9 A support top seat 74 is slidably provided on the top of the support platform 7. The support top seat 74 is slidably connected to the top surface of the support platform 7 through a linear guide rail. At the same time, the area of ​​the top surface of the support top seat 74 is smaller than the area of ​​the top surface of the support platform 7. The support top seat 74 is made of magnetic material, such as magnetized steel. An electromagnet 741 for adsorbing the support top seat 74 is fixedly connected to one end of the support platform 7 away from the hydraulic jack on the construction support 5.

[0087] When the guide beam 1 is located above the construction slide 6, the guide beam 1 is overlapped on the support top seat 74, and before the support platform 7 slides to the side of the hydraulic jack on the construction support 5, the support top seat 74 is adsorbed by the electromagnet 741, and after the support platform 7 slides to the side of the hydraulic jack on the construction support 5, the adsorption of the support top seat 74 is cancelled. Then, in the process of the guide beam 1 being pushed, the guide beam 1 will drive the support top seat 74 to slide, and the end of the guide beam 1 will slide to the pushing part of the hydraulic jack on the construction support 5 while being supported, so as to facilitate construction and reduce the influence of excessive deflection of the guide beam 1 on construction.

[0088] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction process for a steel-concrete continuous beam bridge with a walking-type top-pushing steel box beam, characterized in that: The following steps are involved: S1. Temporary pier platform erection: A temporary pier platform is formed by assembling steel trusses at the abutment of the initial construction section, and a hydraulic jacking device and a cushion beam for jacking the guide beam (1) and the steel box beam (2) are installed on the top of the temporary pier platform. Simultaneously, a terminal construction platform for temporarily bridging the guide beam (1) and the steel box beam (2) is assembled at the abutment at the end of the construction, and the terminal construction platform is also provided with a hydraulic jacking device and a cushion beam; S2. Debugging of jacking equipment: Debug the hydraulic jacking device by preloading; S3, guide beam assembly: steel profiles are assembled in sections on the temporary pier platform to form a guide beam (1); S4, steel box girder assembly: the middle diaphragm, side diaphragm, top plate, bottom plate, web plate and outer anchor box of the steel box girder (2) are assembled on the temporary pier platform by hoisting or on the completed road, and the steel box girder (2) of the initial section is fixedly connected to the end of the guide beam (1); S5, back-support truss installation; the back-support truss (3) is formed by assembling steel profiles, and the back-support truss (3) is located above the connection between the guide beam (1) and the steel box beam, the back-support truss (3) is fixedly connected to the tail of the guide beam (1) by bolts, and the back-support truss (3) is fixedly connected to the steel box beam of the initial section by a fixing assembly (4); S6, pushing: using a hydraulic pusher to push the initial section of the steel box girder (2) and the guide beam (1), and after the pushing is completed, assembling the next section of the steel box girder (2) at the end of the steel box girder (2) away from the guide beam (1), and making sure that the center of gravity of the steel box girder (2) and the guide beam (1) is always located on the temporary pier platform, and then repeating the steps of pushing and assembling the steel box girder (2), so that the front end of the guide beam (1) overlaps the end construction platform, and finally dismantling the guide beam (1) and the back-supporting truss (3), and completing the assembly and installation of the steel box girder (2) at the end of the construction on the end construction platform; S7, pouring: pouring concrete in layers and intervals in a plurality of mutually connected steel box beams (2) to form a steel-concrete continuous beam, and then completing the pouring of the bridge deck on the top surface of the steel box beam (2); The terminal construction platform comprises a construction support (5) fixedly connected to the ground, a construction slide (6) vertically slidably connected to the outer wall of the construction support (5) facing the temporary pier platform, and a support platform (7) arranged on the construction slide (6), the hydraulic jack of the terminal construction platform is arranged on the top of the construction support (5), the top of the construction support (5) and the upper end surface of the construction slide (6) are fixedly connected with construction guide rails (51) parallel to each other and with overlapping sliding paths, the support platform (7) is slidably arranged on at least one of the construction guide rails (51), and the construction support (5) is provided on the upper end surface of the construction slide (6). The frame (5) is fixedly connected with a lifting member (52) for lifting the construction slide (6), and the support platform (7) is used to temporarily support the guide beam (1) or the steel box beam (2); in step S6, when the end of the guide beam (1) away from the steel box beam (2) is pushed to the top of the support platform (7), the lifting member (52) lifts the construction slide (6) so that the end of the guide beam (1) is placed on the support platform (7) and the end of the guide beam (1) is lifted so that the end of the guide beam (1) is flush with the top of the hydraulic jacking device, and then the end of the guide beam (1) is pushed to the jacking part of the hydraulic jacking device.

2. The construction process of a steel-concrete continuous beam bridge with a walking-type jacking steel box beam according to claim 1 is characterized in that: The lifting member (52) comprises a winch (521) fixedly connected to the construction support (5), a lifting pulley (522) rotatably connected to the top of the construction support (5), and a lifting rope (523); one end of the lifting rope (523) is connected to the lifting end of the winch (521); the other end of the lifting rope (523) is wound around the top of the lifting pulley (522), then extends downward and is fixedly connected to the middle or lower part of the construction slide (6); the construction support (5) is provided with a locking member (61) for slidingly locking the construction slide (6).

3. The construction process of a steel-concrete continuous beam bridge with a walking-type jacking steel box beam according to claim 2 is characterized in that: The locking member (61) comprises a locking hydraulic cylinder (611) and a locking pin (612) fixedly connected to the telescopic end of the locking hydraulic cylinder (611); the locking pin (612) is slidably arranged on the construction slide seat (6); the locking hydraulic cylinder (611) is fixedly connected to the construction slide seat (6); and the construction support (5) is fixedly connected to a locking tube (613) for cooperating with the locking pin (612).

4. The construction process of a steel-concrete continuous beam bridge with a walking-type top-pushing steel box beam according to claim 2 is characterized in that: The construction support (5) is provided with an anti-falling component (53), and the anti-falling component (53) is used to prevent the construction slide seat (6) from falling when the hoist (521) fails.

5. The construction process of a steel-concrete continuous beam bridge with a walking-type top-pushing steel box beam according to claim 4 is characterized in that: The anti-fall component (53) comprises an anti-fall pin (531) and an anti-fall rope (532); the middle portion of the anti-fall pin (531) is rotatably connected to the construction slide (6); one end of the anti-fall rope (532) is fixedly connected to the lifting rope (523); the other end of the anti-fall rope (532) is fixedly connected to an end of the anti-fall pin (531) away from the construction support (5); the construction support (5) is fixedly connected to an anti-fall rack (54) for clamping the anti-fall pin (531); and the construction slide (6) is fixedly connected to an anti-fall spring (533) for pushing the anti-fall pin (531) to abut against the anti-fall rack (54).

6. The construction process of a steel-concrete continuous beam bridge with a walking-type top-pushing steel box beam according to claim 2 is characterized in that: The support platform (7) is provided with an injection component (71) for injecting lubricant onto the construction guide rail (51) during the sliding process. The injection component (71) comprises a delivery pipe (711) fixedly connected to the support platform (7) on the side of the hydraulic jack on the construction support (5) and an oil storage tank (712) for supplying lubricant to the delivery pipe (711). The delivery pipe (711) is provided with an injection control component (72) for pushing the lubricant in the delivery pipe (711) to be sprayed toward the construction guide rail (51) during the sliding process of the support platform (7).

7. The construction process of a steel-concrete continuous beam bridge with a walking-type jacking steel box beam according to claim 6 is characterized in that: The injection control component (72) comprises an injection pipe (721) and an injection plate (722) slidably arranged on the inner wall of the delivery pipe (711); an injection chamber (723) is formed in the injection plate (722) and the injection pipe (721); the oil storage tank (712) and one end of the delivery pipe (711) facing the oil storage tank (712) are both connected to the injection chamber (723) through a one-way valve (724); the flow directions of the two one-way valves (724) are opposite, and the flow direction of the one-way valve (724) connected to the oil storage tank (712) is toward the injection chamber (723); the injection pipe (721) is provided with a driving component (73) for intermittently controlling the reciprocating sliding of the injection plate (722).

8. The construction process of a steel-concrete continuous beam bridge with a walking-type top-pushing steel box beam according to claim 7 is characterized in that: The driving member (73) comprises a driving rod (731), a driving gear (732) rotatably connected to the driving rod (731), and two driving racks (733); the two driving racks (733) are respectively fixedly connected to two construction guide rails (51), and the driving gear (732) is meshed with one of the driving racks (733); the driving rod (731) coaxially enters and exits the conveying pipe (711) and is fixedly connected to the injection plate (722); the rotation plane of the driving gear (732) is parallel to the driving rod (731); and an injection spring (734) for pushing the injection plate (722) to slide is provided at one end of the injection plate (722) away from the injection chamber (723).

9. A steel-concrete continuous beam bridge construction process with a walking-type top-pushing steel box beam according to any one of claims 1 to 8, characterized in that: The fixing assembly (4) comprises a fixing beam (41) and fixing bolts (42) passing through the fixing beam (41) and the back-supporting truss (3); the edge of the outer anchor box is clamped between the fixing beam (41) and the lower end surface of the back-supporting truss (3).

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