Hard rock shallow covering layer steel box girder bottom leveling jig frame dismantling method

Abstract

The invention provides a hard rock shallow covering layer steel box girder bottom leveling jig frame dismantling method which comprises the steps that S1, according to the position of a leveling jig frame, the installation position of a jig frame dismantling platform is designed, and silt on the installation position is pumped away; s2, adjusting the river bed elevation of the covering layer at the mounting position to meet the mounting requirement of the leveling jig frame; and S3, the formed steel box girder is used for completing installation of the jig frame dismantling platform on the covering layer riverbed, and fixing is completed through a plurality of platform pull rod components arranged between the outer portion of the jig frame dismantling platform and the covering layer riverbed. A stable and reliable platform structure is formed through combination of the lattice type platform support, the combined platform face and the platform pull rod component, a safe and stable operation environment is provided for dismantling a variable-cross-section steel box girder bottom leveling jig frame, meanwhile, in the installation process, the characteristic of a hard rock shallow covering layer is utilized, foundation piles do not need to be arranged, and the construction cost is reduced. And the adaptability and the construction efficiency in a complex environment are obviously improved.

Description

Technical Field

[0001] The invention relates to the field of bridge engineering, in particular to a method for removing a bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer. Background Art

[0002] Variable-section continuous steel box girders are widely used in modern long-span bridge structures. Typical lengths range from 100 to 400 meters, with a height difference from the support to the mid-span typically ranging from 1.5 to 4 meters. With the advancement of bridge construction technology, steel box girders are often assembled on both sides and then pushed into place using intelligent walking jacks. During the pushing process, the curved and uneven bottom of the variable-section steel box girder requires a leveling cradle to assist in the smooth pushing process.

[0003] At present, the leveling cradle is generally 80 to 300 meters long and weighs 1,000 to 2,000 tons. It needs to be removed after the installation of the steel box girder is completed. The leveling cradle is up to 3 to 4 meters away from the edge of the cantilevered sidewalks on both sides of the bridge deck. If you try to remove it from the bridge deck by hanging, the construction will be difficult and risky. If you choose to remove it from the bottom of the beam, you need to build a construction platform for the demolition operation on the river surface to provide the necessary operating space.

[0004] However, under certain geological conditions, such as when the riverbed is a hard, shallow overburden layer, traditional construction platform foundations are difficult to apply. Underwater drilling is impossible, and the limited space at the bottom of the beam makes it difficult to set up piling equipment. Furthermore, drilling holes in hard rock formations is difficult, making rock-embedded pile foundations unfeasible. Furthermore, using welding connections to construct the construction platform also presents numerous drawbacks, including the difficulty of underwater welding, underwater cutting after construction, and the inability to recycle the construction platform, resulting in resource waste, poor economic efficiency, and environmental impact. Therefore, a method for removing the bottom leveling cradle of a steel box beam in a hard rock shallow overburden layer was proposed to address the above issues. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method for removing the leveling cradle at the bottom of a steel box beam with a shallow hard rock covering layer, so as to solve the problem that traditional construction platforms are not convenient for completing rapid installation on the hard shallow covering layer under the condition of limited space at the bottom of the beam, thereby affecting the removal of the leveling cradle.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for removing the bottom leveling cradle of a steel box beam in a shallow overburden layer of hard rock, the method comprising: S1. Design the installation location of the tire frame removal platform according to the position of the leveling tire frame, and remove the mud and sand at the installation location; S2. Adjust the elevation of the riverbed of the covering layer at the installation location to meet the installation requirements of the leveling tire frame; S3. Using the formed steel box girder, the tire frame removal platform is installed on the overburden riverbed and fixed by multiple platform tie rods arranged between the exterior of the platform and the overburden riverbed; S4. Use the tire frame dismantling platform in conjunction with the lifting equipment and barge to dismantle the leveling tire frame in sections; S5, releasing the fixation of the tire frame removal platform and moving it to the removal position of the next leveling tire frame, and then repeating step S4 to complete the removal of the leveling tire frame; S6. Repeat step S5 until all leveling tire frames are removed.

[0007] In a preferred embodiment, the tire frame removal platform includes a plurality of lattice platform supports and a combined platform surface arranged on top of the lattice platform supports, the combined platform surface is composed of a plurality of platform surface units respectively arranged on the top of the lattice platform supports and between the lattice platform supports, and the platform tie rod members are arranged between the side surfaces of the lattice platform supports and the overburden riverbed; A guardrail is also provided at the edge of the top of the combined platform surface.

[0008] In the preferred embodiment, the lattice platform support comprises four columns, a parallel beam is provided between the middle parts of the four columns, a cross-type diagonal bracing beam is provided between the four columns and located above the parallel beam, two columns along the width direction of the combined platform surface form a group, and the tops of the two groups of columns are provided with a top cross beam; The columns, parallel beams, cross bracing beams and top cross beams are all connected by bolts.

[0009] In a preferred embodiment, the platform surface unit includes partition beams symmetrically arranged on two top cross beams, a plurality of Bailey beams are arranged between the partition beams, and a panel fixed to the partition beams is arranged above the Bailey beams; The partition beam includes a bottom plate, on which bottom holes for connecting with top cross beam bolts are equidistantly arranged, a U-shaped seat is arranged on the bottom hole, the top of the U-shaped seat is provided with a bottom hole for connecting with panel bolts, and a placement groove for placing Bailey beams is formed between the U-shaped seats.

[0010] In a preferred embodiment, the platform tie rod component includes a tie rod base buried in a preset position on the riverbed, and a tie rod member arranged between the tie rod base and the lattice platform support.

[0011] In a preferred embodiment, the method for installing the tire frame removal platform in step S3 includes: S31. burying a tie rod base for connecting the tie rod member at a preset position on the riverbed; S32. Assemble the first lattice platform support and platform surface unit on the formed steel box girder, and use the lifting equipment to lift the lattice platform support to the preset riverbed. Then, lift the platform surface unit onto the lattice platform support and secure the two together. S33, installing tie rods between the installed lattice platform brackets and corresponding tie rod bases to form platform tie rod components and form platform units; S6. Hoist the lifting equipment onto the platform unit on the formed steel box girder, and repeat the above installation steps of the lattice platform bracket, platform surface unit and platform tie rod components on the platform unit to complete the installation of the remaining platform units, and install the platform surface unit between all the leveling frame units to form a combined platform surface.

[0012] In a preferred embodiment, the elevation adjustment method of the overburden riverbed in step S2 is as follows: when the riverbed position is higher than the design elevation, the riverbed rocks exceeding the elevation are broken by a vibrating hammer until the design elevation is reached; When the riverbed is lower than the standard elevation, concrete is poured at the foot of the tire frame removal platform through a conduit using underwater pouring method to level the bottom elevation of the tire frame removal platform.

[0013] In a preferred embodiment, the pull rod member includes a hinged seat provided above the lattice platform support, and a retractable pull rod hingedly connected to the hinged seat, and the other end of the retractable pull rod can be hingedly connected to the pull rod base; The telescopic pull rod includes an outer rod, the top of which is provided with a top hinge portion that can be hinged to the hinge seat, a telescopic cavity with an open bottom end is provided inside, the telescopic cavity is symmetrically provided with limit grooves passing through it, the telescopic rod is movably inserted into the telescopic cavity, the top of the telescopic rod is provided with a limit locking portion that passes through the two limit grooves, and the bottom end is provided with a bottom hinge seat that can be hinged to the pull rod base; The limit locking part includes a limit rod passing through two limit slots. The limit rod is hollow, and a forward and reverse threaded screw is rotatably arranged inside it. One end of the limit rod is provided with a first driving device that is transmission-connected to the forward and reverse threaded screws. The two threaded sections of the forward and reverse threaded screws are respectively threadedly fitted with a moving shaft. The outside of the limit rod is provided with a plurality of sliding grooves corresponding to the threaded sections of the forward and reverse threaded screws. The outside of the moving shaft is provided with a connecting block passing through the sliding groove. The other end of the connecting block is connected to a locking seat. The side of the locking seat close to the outer rod is in a shape that matches it, and a locking rubber sheet is provided on it.

[0014] In a preferred embodiment, the pull rod further comprises an angle-adjustable telescopic cylinder, one end of which is hingedly arranged on the lattice platform bracket, and the other end of which is hingedly arranged on the outer sleeve rod.

[0015] In the preferred embodiment, the telescopic pull rod further includes a telescopic adjustment structure, which includes a support platform provided on the outer rod, the support platform is located below the limit groove, two non-rotating screw elevators are provided on the support platform, the top of the screw of the non-rotating screw elevator is provided with a collar sleeved on the outside of the limit rod, and an opening for the screw of the non-rotating screw elevator to pass through is provided on the support platform, and the two non-rotating screw elevators are connected by a transmission shaft, and a second drive device is installed on one of the non-rotating screw elevators; The bottom of the support platform is provided with a support foot connected to the outer sleeve rod; The installation method of the pull rod is as follows: before assembling the lattice platform bracket, install the retractable pull rod and the angle-adjustable telescopic cylinder in the retractable state on the corresponding column, and use the strap to tie the bottom end of the retractable pull rod to the column. After the lattice platform bracket is installed, release the strap, and then use the angle-adjustable telescopic cylinder to adjust the retractable pull rod to the angle corresponding to the pull rod base, and then adjust the retractable pull rod to the corresponding length, and after completing the hinge with the pull rod base, lock its length.

[0016] The present invention provides a method for dismantling the bottom leveling cradle of a steel box girder with a shallow covering layer of hard rock. A stable and reliable platform structure is formed by combining a lattice platform support, a combined platform surface and a platform tie rod component, providing a safe and stable working environment for dismantling the bottom leveling cradle of a variable-section steel box girder. At the same time, during installation, the characteristics of the shallow covering layer of hard rock are utilized, and there is no need to drive foundation piles, which significantly improves the adaptability and construction efficiency in complex environments. In addition, the adoption of an assembled structural design facilitates quick installation and disassembly, and the platform components are reusable, which greatly reduces material waste and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples: Figure 1 This is an overall structural diagram of the tire frame removal platform of the present invention; Figure 2 This is a structural diagram of the lattice platform support of the present invention; Figure 3 This is an exploded structural diagram of the platform surface unit of the present invention; Figure 4 This is a structural diagram of the partition beam of the present invention; Figure 5 This is a structural diagram of a first embodiment of a pull rod member of the present invention; Figure 6 This is an exploded structural diagram of the telescopic pull rod of the present invention; Figure 7 This is a half-section structural diagram of the position limiting and locking portion of the present invention; Figure 8 This is a diagram showing the connection structure of the movable shaft, the connecting block and the locking seat of the present invention; Figure 9 This is a structural diagram of the angle adjustment telescopic cylinder of the present invention in an adjustment state; Figure 10 is a structural diagram of a second embodiment of the telescopic pull rod of the present invention; Figure 11 This invention Figure 10 Middle part structure diagram; Figure 12 This invention Figure 11 Another structural diagram. In the figure: lattice platform support 1; column 101; parallel beam 102; cross bracing beam 103; top cross beam 104; combined platform surface 2; platform surface unit 20; bottom plate 210; bottom hole 211; U-shaped seat 212; bottom hole 213; placement groove 214; partition beam 21; bottom plate 210; bottom hole 211; U-shaped seat 212; bottom hole 213; placement groove 214; Bailey beam 22; panel 23; guardrail 3; platform tie rod member 4; tie rod base 41; tie rod member 42; hinged seat 43; telescopic tie rod 44; outer rod 440; top The hinged portion 441; the telescopic cavity 442; the limiting groove 443; the telescopic rod 444; the limiting locking portion 445; the limiting rod 4450; the forward and reverse threaded screw 4451; the first driving device 4452; the movable shaft 4453; the sliding groove 4454; the connecting block 4455; the locking seat 4456; the bottom hinge seat 446; the telescopic adjustment structure 447; the support platform 4470; the non-rotating screw lift 4471; the transmission shaft 4472; the second driving device 4473; the collar 4474; the opening 4475; the support leg 4476; the angle adjustment telescopic cylinder 45. DETAILED DESCRIPTION

[0018] Example 1 like Figure 1-4 As shown, a method for removing a bottom leveling tread for a steel box girder in a shallow hard rock overburden layer includes a tread removal platform. The specific number of tread removal platforms can be adjusted according to the removal needs. In this embodiment, the number of tread removal platforms is two. The method includes: S1. According to the position of the leveling tire frame, the installation position of the tire frame removal platform is designed, and the mud and sand on the installation position are pumped away. The mud and sand are specifically pumped away by a sand pumping ship.

[0019] S2. Adjust the elevation of the riverbed of the covering layer at the installation location to meet the installation requirements of the leveling cradle. The specific adjustment method is: when the riverbed position is higher than the design elevation, use a vibrating hammer to break up the riverbed rocks that exceed the elevation until it reaches the design elevation; When the riverbed is lower than the standard elevation, concrete is poured at the foot of the tire frame removal platform through a conduit using underwater pouring method to level the bottom elevation of the tire frame removal platform.

[0020] S3. Use the formed steel box girder to complete the installation of the tire frame removal platform on the covering riverbed, and fix it by setting multiple platform tie rod components 4 between its outside and the covering riverbed. The specific number of platform tie rod components 4 can be adjusted according to actual needs, wherein the platform tie rod components 4 include a tie rod base 41 buried in a preset position on the riverbed, and a tie rod member 42 set between the tie rod base 41 and the lattice platform bracket 1.

[0021] S4. Use the tire frame dismantling platform in conjunction with lifting equipment and barges to dismantle the leveling tire frame in sections.

[0022] S5. Release the fixation of the tire frame dismantling platform and move it to the dismantling position of the next leveling tire frame, and then repeat step S4 to complete the dismantling of the leveling tire frame. In this embodiment, the specific moving method can be to hoist it onto a barge through a hoisting device, and then use the barge to move it. During the movement, it can be partially disassembled according to the actual situation on site, and assembled after moving to the designated position.

[0023] S6. Repeat step S5 until all leveling tire frames are removed.

[0024] With this design, the tire frame removal platform can be installed in the confined space at the bottom of the beam, and the tire frame removal platform can be quickly fixed on the riverbed of the covering layer through the platform pull rod member 4 without the need for additional piling. At the same time, the convenient fixing structure facilitates its recycling.

[0025] In the preferred embodiment, the tire frame dismantling platform includes a plurality of lattice platform supports 1 and a combined platform surface 2 arranged on the top of the lattice platform supports 1. The combined platform surface 2 is composed of a plurality of platform surface units 20 respectively arranged on the top of the lattice platform supports 1 and between the lattice platform supports 1. In this embodiment, the number of lattice platform supports 1 is two, and the number of platform surface units 20 is three, which are respectively arranged on two lattice platform supports 1 and between two lattice platform supports 1. The platform pull rod member 4 is arranged between the side of the lattice platform support 1 and the covering layer riverbed.

[0026] A guardrail 3 is also provided at the edge of the top of the combined platform surface 2 to prevent falling.

[0027] Among them, the lattice platform support 1 includes four columns 101, a parallel beam 102 is arranged between the middle parts of the four columns 101, and a cross-type diagonal bracing beam 103 is arranged between the four columns 101 and located above the parallel beam 102. Two columns 101 along the width direction of the combined platform surface 2 are a group, and the tops of the two groups of columns 101 are provided with top cross beams 104, which are used to support the platform surface unit 20.

[0028] The columns 101, the parallel beams 102, the cross bracing beams 103 and the top cross beams 104 are all connected by bolts. It should be noted that they are all provided with a plurality of holes for convenient bolt connection, so as to facilitate flexible assembly between them by bolt connection and facilitate recycling. In the preferred embodiment, the platform surface unit 20 includes a partition beam 21 symmetrically arranged on two top cross beams 104, a plurality of Bailey beams 22 are arranged between the partition beams 21, and a panel 23 fixed to the partition beams 21 is arranged above the Bailey beams 22; The partition beam 21 includes a base plate 210, on which bottom holes 211 for bolting to the top cross beam 104 are equidistantly arranged, and a U-shaped seat 212 is arranged on the bottom hole 211. The top of the U-shaped seat 212 is provided with a bottom hole 213 for bolting to the panel 23. A placement groove 214 for placing the Bailey beam 22 is formed between the U-shaped seats 212. The placement groove 214 can separate the Bailey beam 22 in an orderly manner to ensure its effective support. During installation, the Bailey beam 22 is installed in the placement groove 214 of the partition beam 21 in turn, and then the panel 23 is placed on the Bailey beam 22 and connected to the partition beam 21 by bolts.

[0029] In a preferred embodiment, the method for installing the tire frame removal platform in step S3 includes: S31, burying a tie rod base 41 for connecting a tie rod member 42 at a preset position on the riverbed; S32, assembling the first lattice platform support 1 and the platform surface unit 20 on the formed steel box girder, and using a lifting device to lift the lattice platform support 1 to a preset riverbed, and then lifting the platform surface unit 20 onto the lattice platform support 1 and fixing the two; S33, installing the tie rod 42 between the installed lattice platform support 1 and the corresponding tie rod base 41 to form a platform tie rod member 4, thereby forming a platform unit; S6. Hoist the hoisting equipment onto the platform unit on the formed steel box girder, and repeat the above-mentioned installation steps of the lattice platform bracket 1, the platform surface unit 20 and the platform tie rod member 4 on the platform unit to complete the installation of the remaining platform units, and install the platform surface unit 20 between all the leveling frame units to form a combined platform surface 2.

[0030] In this embodiment, each lattice platform support 1 is installed with four platform tie rod members 4 , and the four platform tie rod members 4 are respectively arranged on the four columns 101 of the lattice platform support 1 .

[0031] Example 2 Further illustrate with reference to Example 1, Figure 5-12The structure shown, in order to facilitate the installation of the pull rod member 42, the pull rod member 42 includes a hinged seat 43 arranged above the lattice platform bracket 1, specifically arranged on the column 101 corresponding to the pull rod base 41, the hinged seat 43 is fixed by bolts, and a telescopic pull rod 44 hinged to the hinged seat 43, and the other end of the telescopic pull rod 44 can be hinged to the pull rod base 41. It should be noted that a hinge structure corresponding to the telescopic pull rod 44 is provided on the pull rod base 41. Through the telescopic pull rod 44, it can be adjusted in time according to the length required during its installation, and can adapt to complex construction environments.

[0032] Among them, the telescopic pull rod 44 specifically includes an outer rod 440, the top of the outer rod 440 is provided with a top hinge part 441 which can be hinged to the hinge seat 43, and the interior is provided with a telescopic cavity 442 with an open bottom end. The top hinge part 441 is hinged to the hinge seat 43 through an axis, and the telescopic cavity 442 is symmetrically provided with limiting grooves 443 passing through it. The length of the limiting groove 443 can be adjusted according to the required telescopic length. A telescopic rod 444 is movably inserted in the telescopic cavity 442, and the top of the telescopic rod 444 is provided with a limiting locking part 445 passing through the two limiting grooves 443, and the bottom end is provided with a bottom hinge seat 446 which can be hinged to the pull rod base 41.

[0033] The limiting locking portion 445 includes a limiting rod 4450 that passes through the two limiting grooves 443 , so that the limiting rod 4450 slides in the two limiting grooves 443 to limit the linear sliding and sliding distance of the telescopic rod 444 .

[0034] In addition, the limiting rod 4450 is hollow, and a forward and reverse threaded screw 4451 is rotatably provided inside the limiting rod 4450. The forward and reverse threaded screw 4451 is rotatably provided in the limiting rod 4450 through a bearing. One end of the limiting rod 4450 is provided with a first driving device 4452 that is transmission-connected to the forward and reverse threaded screw 4451. The first driving device 4452 is fixed to the end of the limiting rod 4450 by a bolt, and its output shaft is transmission-connected to the forward and reverse threaded screw 4451. The two threaded sections of the forward and reverse threaded screw 4451 are respectively threadedly fitted with a moving shaft 4453. The outside of the limiting rod 4450 is provided with a plurality of sliding grooves 4454 corresponding to the threaded segments of the forward and reverse threaded screw 4451. In this embodiment, each threaded segment corresponds to three annular sliding grooves 4454, and the length of the sliding groove 4454 is adapted to the length of the threaded segment. The outside of the movable shaft 4453 is provided with a connecting block 4455 passing through the sliding groove 4454, and the other end of the connecting block 4455 is connected to a locking seat 4456. The locking seat 4456 is close to the side of the outer rod 440 and is in a shape that matches it, and a locking rubber sheet is provided on it.

[0035] With such a design, the forward and reverse threaded screws 4451 can be driven to rotate by the first driving device 4452, thereby driving the two movable shafts 4453 thereon to move in opposite directions under the sliding cooperation between the connecting block 4455 and the sliding groove 4454, thereby achieving the effect of locking the position of the telescopic rod 444 through the fitting relationship between the locking seat 4456 and the outer rod 440. Conversely, the unlocking effect can be achieved by removing the locking seat 4456. At the same time, the shape of the locking seat 4456 matching the outer rod 440 and the design of the locking rubber sheet facilitate to improve the locking effect, thereby achieving the effect of automatic locking and unlocking.

[0036] The pull rod 42 further includes an angle-adjusting telescopic cylinder 45 , one end of which is hingedly mounted on the construction platform unit 1 , and the other end of which is hingedly mounted on the outer rod 440 .

[0037] With such a design, the tie rod 42 can be installed on the corresponding column 101 on the ground before assembling the lattice platform bracket 1. After the assembly of the lattice platform bracket 1 is completed, the tie rod 42 is installed to the specified height without the need for secondary hoisting work. At the same time, the angle of the telescopic cylinder 45 is adjusted, and the length of the telescopic tie rod 44 is adjusted to complete the connection with the tie rod base 41, which greatly improves its installation efficiency and convenience.

[0038] In this embodiment, in order to better control the telescopic length of the telescopic pull rod 44, a second embodiment of the telescopic pull rod 44 is proposed on the basis of the above embodiment. The telescopic pull rod 44 also includes a telescopic adjustment structure 447. The telescopic adjustment structure 447 includes a support platform 4470 arranged on the outer rod 440. The support platform 4470 is fixed by welding. The support platform 4470 is located below the limiting groove 443. Two non-rotating screw lifts 4471 are arranged on the support platform 4470. The top of the screw of the non-rotating screw lift 4471 is provided with a ring 4474 mounted on the outside of the limiting rod 4450. The support platform 4470 is provided with an opening 4475 for the screw of the non-rotating screw lift 4471 to pass through. The two non-rotating screw lifts 4471 are connected by a transmission shaft 4472, and a second drive device 4473 is installed on one of the non-rotating screw lifts 4471.

[0039] With such a design, when the limit locking part 445 is unlocked, the effect of controlling the extension and retraction of the telescopic rod 444 can be achieved through the synchronous lifting of the screws of the two non-rotating screw lifts 4471, thereby accurately and stably adjusting the usable length of the telescopic pull rod 444. At the same time, the self-locking function of the non-rotating screw lift 4471 when not working is combined with the locking function of the limit locking part 445 to further enhance its locking effect. In addition, the two non-rotating screw lifts 4471 are connected by transmission shaft 4472, and the driving effect is achieved by using a second driving device 4473, which can effectively achieve the synchronous lifting of the two non-rotating screw lifts 4471.

[0040] It should be noted that the non-rotating screw lifter 4471 in this embodiment is a common commercially available product and therefore will not be described in detail here. In addition, the first drive device 4452 and the second drive device 4473 are both drive motor structures.

[0041] The bottom of the support platform 4470 is provided with support legs 4476 connected to the outer rod 440 . In this embodiment, there are three support legs 4476 for improving the support strength of the support platform 4470 .

[0042] The installation method of the pull rod 42 is as follows: before assembling the lattice platform bracket 1, the retractable pull rod 44 and the angle-adjustable telescopic cylinder 45 in the telescopic state are installed on the corresponding column 101, and the bottom end of the retractable pull rod 44 is tied to the column 101 with a strap. After the installation of the lattice platform bracket 1 is completed, the strap is released, and then the angle-adjustable telescopic cylinder 45 is used to adjust the retractable pull rod 44 to the angle corresponding to the pull rod base 41, and then the retractable pull rod 44 is adjusted to the corresponding length, and after completing the hinge connection with the pull rod base 41, its length can be locked.

[0043] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. The method for dismantling the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer is characterized by: Including a tire frame removal platform, the method includes: S1. Design the installation location of the tire frame removal platform according to the position of the leveling tire frame, and remove the mud and sand at the installation location; S2. Adjust the elevation of the riverbed of the covering layer at the installation location to meet the installation requirements of the leveling tire frame; S3, using the formed steel box girder to complete the installation of the tire frame removal platform on the overburden riverbed, and fix it by setting a plurality of platform tie rod members (4) between the outside of the tire frame and the overburden riverbed; S4. Use the tire frame dismantling platform in conjunction with the lifting equipment and barge to dismantle the leveling tire frame in sections; S5, releasing the fixation of the tire frame removal platform and moving it to the removal position of the next leveling tire frame, and then repeating step S4 to complete the removal of the leveling tire frame; S6. Repeat step S5 until all leveling tire frames are removed.

2. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 1 is characterized by: The tire frame dismantling platform comprises a plurality of lattice platform supports (1) and a combined platform surface (2) arranged on the top of the lattice platform supports (1), the combined platform surface (2) is composed of a plurality of platform surface units (20) respectively arranged on the top of the lattice platform supports (1) and between the lattice platform supports (1), and a platform tie rod member (4) is arranged between the side of the lattice platform supports (1) and the covering layer riverbed; A guardrail (3) is also provided at the edge of the top of the combined platform surface (2).

3. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 2 is characterized by: The lattice platform support (1) includes four columns (101), a horizontal beam (102) is provided between the middle parts of the four columns (101), a cross-type diagonal bracing beam (103) is provided between the four columns (101) and is located above the horizontal beam (102), two columns (101) along the width direction of the combined platform surface (2) form a group, and a top cross beam (104) is provided on the top of the two groups of columns (101); The upright columns (101), the parallel beams (102), the cross bracing beams (103) and the top cross beams (104) are all connected by bolts.

4. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 3 is characterized by: The platform surface unit (20) includes a partition beam (21) symmetrically arranged on two top cross beams (104), a plurality of Bailey beams (22) are arranged between the partition beams (21), and a panel (23) fixed to the partition beam (21) is arranged above the Bailey beam (22); The partition beam (21) includes a bottom plate (210), the bottom plate (210) is provided with bottom holes (211) for bolt connection with the top cross beam (104) at equal intervals, a U-shaped seat (212) is provided on the bottom hole (211), a bottom hole (213) for bolt connection with the panel (23) is provided at the top of the U-shaped seat (212), and a placement groove (214) for placing the Bailey beam (22) is formed between the U-shaped seats (212).

5. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to any one of claims 2 to 4, characterized in that: The platform tie rod component (4) comprises a tie rod base (41) buried at a preset position on the riverbed, and a tie rod member (42) arranged between the tie rod base (41) and the lattice platform support (1).

6. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 5 is characterized by: The method for installing the tire frame removal platform in step S3 includes: S31, burying a tie rod base (41) for connecting a tie rod member (42) at a preset position on the riverbed; S32, assembling the first lattice platform support (1) and the platform surface unit (20) on the formed steel box girder, and using a lifting device to lift the lattice platform support (1) to a preset riverbed, and then lifting the platform surface unit (20) onto the lattice platform support (1) and fixing the two; S33, installing a tie rod member (42) between the installed lattice platform bracket (1) and the corresponding tie rod base (41) to form a platform tie rod member (4) to form a platform unit; S6. Hoist the hoisting equipment onto the platform unit on the formed steel box girder, and repeat the above-mentioned installation steps of the lattice platform bracket (1), the platform surface unit (20) and the platform tie rod member (4) on the platform unit to complete the installation of the remaining platform units, and install the platform surface unit (20) between all the leveling frame units to form a combined platform surface (2).

7. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 1 is characterized by: The method for adjusting the elevation of the overburden riverbed in step S2 is as follows: when the riverbed position is higher than the design elevation, the riverbed rocks exceeding the elevation are broken by a vibrating hammer until the design elevation is reached; When the riverbed is lower than the standard elevation, concrete is poured at the foot of the tire frame removal platform through a conduit using underwater pouring method to level the bottom elevation of the tire frame removal platform.

8. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 5 is characterized by: The pull rod member (42) includes a hinged seat (43) arranged above the lattice platform bracket (1), and a retractable pull rod (44) hinged to the hinged seat (43), and the other end of the retractable pull rod (44) can be hinged to the pull rod base (41); The telescopic pull rod (44) includes an outer rod (440), the top of the outer rod (440) is provided with a top hinge portion (441) that can be hinged to the hinge seat (43), the interior is provided with a telescopic cavity (442) with an open bottom end, the telescopic cavity (442) is symmetrically provided with limit grooves (443) that pass through it, a telescopic rod (444) is movably inserted into the telescopic cavity (442), the top of the telescopic rod (444) is provided with a limit locking portion (445) that passes through the two limit grooves (443), and the bottom end is provided with a bottom hinge seat (446) that can be hinged to the pull rod base (41); The limiting locking portion (445) includes a limiting rod (4450) that passes through two limiting grooves (443). The limiting rod (4450) is hollow and has a forward and reverse threaded screw (4451) rotatably arranged therein. One end of the limiting rod (4450) is provided with a first driving device (4452) that is transmission-connected to the forward and reverse threaded screw (4451). The two threaded sections of the forward and reverse threaded screw (4451) are respectively threadedly fitted with a moving shaft (4453). The outside of the limiting rod (4450) is provided with a plurality of sliding grooves (4454) corresponding to the threaded sections of the forward and reverse threaded screws (4451), and the outside of the movable shaft (4453) is provided with a connecting block (4455) passing through the sliding grooves (4454). The other end of the connecting block (4455) is connected to a locking seat (4456), and the side of the locking seat (4456) close to the outer rod (440) is of a shape matching therewith, and a locking rubber sheet is provided thereon.

9. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 8 is characterized by: The pull rod (42) further includes an angle-adjusting telescopic cylinder (45), one end of which is hingedly arranged on the lattice platform bracket (1), and the other end of which is hingedly arranged on the outer sleeve (440).

10. The method for removing the bottom leveling cradle of a steel box beam in a shallow hard rock overburden layer according to claim 9, characterized in that: The telescopic pull rod (44) further includes a telescopic adjustment structure (447), the telescopic adjustment structure (447) including a support platform (4470) arranged on the outer rod (440), the support platform (4470) being located below the limiting groove (443), two non-rotating screw elevators (4471) being arranged on the support platform (4470), the top of the screw of the non-rotating screw elevator (4471) being provided with a collar (4474) sleeved on the outside of the limiting rod (4450), an opening (4475) for the screw of the non-rotating screw elevator (4471) to pass through being provided on the support platform (4470), the two non-rotating screw elevators (4471) being connected to each other by a transmission shaft (4472), and a second driving device (4473) being installed on one of the non-rotating screw elevators (4471); The bottom of the support platform (4470) is provided with a support foot (4476) connected to the outer sleeve rod (440); The installation method of the pull rod (42) is as follows: before assembling the lattice platform bracket (1), the telescopic pull rod (44) and the angle adjustment telescopic cylinder (45) in the telescopic state are installed on the corresponding column (101), and the bottom end of the telescopic pull rod (44) is tied to the column (101) using a strap. After the lattice platform bracket (1) is installed, the strap is released, and then the telescopic pull rod (44) is adjusted to an angle corresponding to the pull rod base (41) using the angle adjustment telescopic cylinder (45). Then, the telescopic pull rod (44) is adjusted to a corresponding length, and after completing the hinge connection with the pull rod base (41), its length is locked.

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