Supporting device for butt joint construction of steel cofferdam and using method thereof

Abstract

The application belongs to the technical field of bridge cofferdam construction, and particularly relates to a supporting device for butt joint construction of a steel cofferdam and a use method thereof. The supporting device for butt joint construction of the steel cofferdam comprises a positioning circular table, a circular table mounting plate above the positioning circular table, a threaded cylinder provided on the bottom surface of the circular table mounting plate, an upper connecting seat fixedly connected to one end of the circular table mounting plate, an upper mounting seat provided on the upper connecting seat, a threaded column rotatably connected to the top surface of the positioning circular table, a funnel mounting seat below the positioning circular table, a lower connecting seat fixedly connected to one side of the funnel mounting seat, a lower mounting seat provided on the lower connecting seat, and a positioning hopper fixed to the top of the funnel mounting seat. The positioning circular table and the positioning hopper can reduce the difficulty of butt joint positioning operation of the cofferdam segment, accelerate the butt joint construction speed, and improve the butt joint safety and the butt joint precision.

Description

Technical Field

[0001] This invention belongs to the field of bridge cofferdam construction technology, specifically relating to a support device for steel cofferdam docking construction and its usage method. Background Technology

[0002] A cofferdam is a temporary retaining structure built in water conservancy projects to construct permanent water facilities. Its function is to prevent water and soil from entering the construction site, facilitating drainage, excavation of foundation pits, and construction of structures within the cofferdam. Steel cofferdams are widely used in bridge construction due to their ease of fabrication and high safety. Steel cofferdams are generally assembled on-site from multiple cofferdam segments. These segments are fabricated in a factory and then hoisted and assembled on-site using floating cranes or similar equipment.

[0003] In existing technologies, steel structure cofferdams have the following problems: (1) In the existing scheme, when hoisting cofferdam segments using wire ropes, the position of the floating crane needs to be constantly adjusted to achieve docking. During the hoisting process, the cofferdam segments are greatly affected by wind and waves, making it difficult to achieve precise alignment between them; (2) The existing cofferdam segment connection process is time-consuming, the floating crane occupies the waterway for a long time, affecting traffic, and the use of wire rope hoisting for a long time poses a safety risk.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a support device and its usage method for the construction of steel cofferdams, so as to solve the problems existing in the prior art when assembling cofferdams by hoisting with steel wire ropes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A support device for the construction of steel cofferdam docking includes: Positioning the frustum; A frustum mounting plate is positioned horizontally above the positioning frustum, and a threaded cylinder is provided on the bottom surface of the frustum mounting plate for rotatable connection; an upper connecting seat is fixedly connected to one end of the frustum mounting plate, and an upper mounting seat is provided on the upper connecting seat for sliding guide engagement with the upper mounting seat through a dovetail groove structure. The bottom is rotatably connected to the top surface of the positioning frustum, and the threaded column is threadedly engaged with the threaded cylinder and extends upward through the frustum mounting plate. A funnel mounting base is located below the positioning truncated cone. A lower connecting base is fixedly connected to one side of the funnel mounting base. The lower connecting base is provided with a lower mounting base that slides and guides the funnel mounting base through a dovetail groove structure. A positioning bucket fixed on the top of the funnel mounting base and corresponding to the positioning frustum.

[0007] When lowering the upper section of the cofferdam, the positioning pedestal and positioning buckets can be used to achieve precise, rapid and safe docking of the cofferdam segments.

[0008] More specifically, the threaded cylinder has at least two symmetrical axial grooves on its side; the frustum mounting plate has protrusions corresponding to the grooves. Through the sliding engagement of the grooves and protrusions, the threaded cylinder and the frustum mounting plate cannot rotate relative to each other, thus allowing the threaded cylinder to rotate independently.

[0009] More specifically, the top of the upper mounting base is closed, and a baffle is slidably connected to the upper mounting base near its bottom. One end of the baffle extends through and out of the upper mounting base and is fixedly connected to a handle. The bottom of the lower mounting base is sealed, and the top has an opening. The baffle allows the upper connecting base to be easily confined within the upper mounting base.

[0010] More specifically, a movable rod is slidably connected to the center of the positioning truncated cone, and a spring with its top fixed to the bottom of the positioning truncated cone is sleeved on the movable rod; a hemispherical guide head is fixed to the bottom of the movable rod, and the guide head is fixedly connected to the bottom of the spring. When the positioning bucket and the positioning truncated cone are docked and positioned, the guide head first contacts the support block. As the positioning bucket and the positioning truncated cone gradually approach each other, the spring acts as a buffer, which can accelerate the lowering speed of the cofferdam segment, reduce the inertial effect during the lowering process of the cofferdam segment, and reduce the impact between the cofferdam segment and the device.

[0011] More specifically, the bottom of the positioning bucket has a central hole that penetrates the positioning bucket, and a support block is fixed on the wall of the central hole.

[0012] More specifically, the outer wall of the guide head is provided with multiple evenly distributed steel balls. The steel balls can improve the smoothness of the guide when the guide head contacts the positioning bucket, thereby increasing the positioning speed.

[0013] More specifically, the support device for the steel cofferdam docking construction also includes a driving component. This driving component comprises a driven gear fixed to the top of the threaded cylinder, a motor fixed to the frustum mounting plate with its output shaft pointing vertically downwards, and a driving gear fixed to the motor's output shaft and meshing with the driven gear. In use, the motor provides driving force to rotate the driving gear. The driving gear, through its meshing with the driven gear, drives the driven gear to rotate, thereby rotating the threaded cylinder. The threaded connection between the threaded cylinder and the threaded cylinder allows for adjustment of the height between the frustum mounting plate and the positioning frustum. This adjustment facilitates the positioning between cofferdam segments, reduces the initial docking positioning time during hoisting, and is applicable to docking positioning of cofferdam segments of different heights, thus improving the practicality of the support device.

[0014] More specifically, the bottom surface of the threaded cylinder is fixedly connected to multiple evenly distributed hydraulic rods, and the bottom of each hydraulic rod is fixedly connected to a limiting collar sleeved on the threaded column. In use, the hydraulic rods are in an extended state. After the positioning bucket and the positioning frustum are aligned, a certain space is reserved by extending the hydraulic rods, allowing for manual inspection of the cofferdam segment splicing. Errors and deformations occurring during cofferdam processing are corrected on-site. Then, the hydraulic rods are controlled to shorten, achieving precise positioning and alignment of the cofferdam segments.

[0015] More specifically, a number of evenly distributed reinforcing ribs are fixedly connected between the positioning hopper and the funnel mounting base. By setting the reinforcing ribs, the mechanical strength of the positioning hopper can be improved.

[0016] The present invention also provides a method for using the support device for the steel cofferdam docking construction, comprising the following steps: S1. In the cofferdam processing plant, the upper mounting base and the lower mounting base are installed between cofferdam segments by measurement and positioning; wherein, the upper mounting base is fixedly connected to the wall plate of the upper cofferdam segment by bolts, and the lower mounting base is fixedly connected to the wall plate of the lower cofferdam segment by bolts. S2. After pulling out the baffle using the handle, install the upper connecting seat into the upper mounting seat, and then insert the baffle into the upper mounting seat using the handle; at the same time, install the lower connecting seat into the lower mounting seat through the opening at the top of the lower mounting seat; S3. Hoist the lower section of the cofferdam to the designed position, and transport the upper section of the cofferdam to the construction site by barge and floating crane, ready for hoisting work; start the motor, which drives the threaded cylinder to rotate through the drive gear and driven gear, and adjust the distance between the truncated plate and the positioning truncated plate to the maximum to facilitate the alignment and positioning of subsequent cofferdam sections; at the same time, control the extension of the hydraulic rod until the positioning truncated plate is in contact with the limiting collar; S4. By using a floating crane to lower the cofferdam section, and by using the positioning bucket and positioning platform, the upper and lower cofferdam sections are initially connected and positioned, thereby achieving temporary fixation of the upper and lower cofferdam sections; S5. Start the motor, which drives the threaded cylinder to rotate through the drive gear and driven gear, so that the upper section of the cofferdam continues to be lowered smoothly until the threaded column reaches the design position, realizing the initial docking of the upper and lower sections of the cofferdam; then the hydraulic rod controls the reserved gap between the upper and lower sections of the cofferdam, and manual on-site inspection is carried out to correct the processing errors and deformations at the docking position of the cofferdam segments; S6. After the repair is completed, control the hydraulic rod to retract, so that the upper section of the cofferdam can continue to be lowered, thereby accurately assembling the upper section of the cofferdam onto the lower section of the cofferdam for welding construction; S7. Remove the upper mounting base, upper connecting base, lower mounting base and lower connecting base, and repeat S1-S6 until all cofferdam segments are assembled.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting up a positioning truncated cone and a positioning bucket, the present invention can reduce the difficulty of docking and positioning operations of cofferdam segments, speed up docking construction, and improve docking safety and docking accuracy.

[0018] (2) The distance between the positioning frustum and the frustum mounting plate of this invention is freely adjustable, making it suitable for cofferdam installations of different heights and facilitating docking construction. The hydraulic rod device allows for reserved maintenance space between cofferdam segments, facilitating on-site manual adjustments and enabling precise docking of cofferdam segments.

[0019] (3) By setting the spring, the present invention can buffer the positioning platform and positioning bucket during the assembly of the positioning platform and positioning bucket, protect the support device, speed up the lowering speed of the cofferdam segment, and reduce the impact of the device and cofferdam during the lowering process.

[0020] (4) The support device in this invention is detachable and reusable, with low turnover cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the positioning frustum and upper connecting seat of the present invention; Figure 3 This is an exploded view of the positioning frustum and the upper mounting base of the present invention; Figure 4 This is a cross-sectional view of the threaded column and frustum mounting base of the present invention; Figure 5 This is a schematic diagram of the positioning head and lower mounting base of the present invention; Figure 6 for Figure 5 Side view from below; Figure 7 This is a top view of the support device of the present invention applied to a cofferdam.

[0022] Explanation of key figure labels: 100. Positioning frustum; 101. Movable rod; 102. Spring; 103. Guide head; 104. Steel ball; 200. Frustum mounting plate; 201. Threaded cylinder; 202. Upper connecting seat; 203. Upper mounting seat; 204. Baffle; 2041. Handle; 205. Hydraulic rod; 206. Protrusion; 300. Threaded post; 301. Limiting collar; 302. Groove; 303. Limiting plate; 400. Funnel mounting base; 401. Lower connecting base; 402. Lower mounting base; 403. Reinforcing rib; 500, Positioning bucket; 501, Center hole; 502, Support block; 600. Driving component; 601. Driven gear; 602. Motor; 603. Driving gear. Detailed Implementation

[0023] The following is a clear and complete description of the technical solution of this invention patent. Obviously, the described embodiments are some, but not all, of the embodiments of this invention. Example

[0024] See appendix Figure 1-7 A support device for the construction of steel cofferdam docking, comprising: In this embodiment, a movable rod 101 is slidably connected to the middle of the positioning frustum 100. A spring 102 with its top fixed to the bottom of the positioning frustum 100 is sleeved on the movable rod 101. A hemispherical guide head 103 is fixed to the bottom of the movable rod 101. The guide head 103 is fixedly connected to the bottom of the spring 102, and a plurality of evenly distributed steel balls 104 are provided on the outer wall of the guide head 103. A frustum mounting plate 200 is horizontally positioned above the positioning frustum 100. A threaded cylinder 201 is rotatably connected to the bottom surface of the frustum mounting plate 200. An upper connecting seat 202 is fixedly connected to one end of the frustum mounting plate 200. An upper mounting seat 203 is provided on the upper connecting seat 202 and slides to guide it. In this embodiment, the top of the upper mounting seat 203 is closed, and a baffle 204 is slidably connected to the upper mounting seat 203 near the bottom. One end of the baffle 204 passes through and extends out of the upper mounting seat 203 and is fixedly connected to a handle 2041. A threaded post 300 is rotatably connected to the top surface of the positioning frustum 100. The threaded post 300 is threadedly engaged with the threaded cylinder 201 and extends upward through the frustum mounting plate 200. In this embodiment, a plurality of evenly distributed hydraulic rods 205 are fixedly connected to the bottom surface of the threaded cylinder 201, and the bottom of each hydraulic rod 205 is fixedly connected to a limiting collar 301 sleeved on the threaded post 300. At least two axial grooves 302 are symmetrically opened on the side of the threaded post 300. The frustum mounting plate 200 is provided with protrusions 206 corresponding to the grooves 302. In this embodiment, a limiting plate 303 is fixedly fixed to the top of the threaded post 300. A funnel mounting base 400 is located below the positioning frustum 100. A lower connecting base 401 is fixedly connected to one side of the funnel mounting base 400. A lower mounting base 402 is provided on the lower connecting base 401 and slides therewith. In this embodiment, the bottom of the lower mounting base 402 is sealed and the top is open. A positioning bucket 500 is fixed to the top of the funnel mounting base 400 and corresponds to the positioning frustum 100. The bottom of the positioning bucket 500 has a central hole 501 that penetrates the positioning bucket 500. A support block 502 is fixed on the wall of the central hole 501. In this embodiment, a plurality of evenly distributed reinforcing ribs 403 are fixedly connected between the positioning bucket 500 and the funnel mounting base 400. The drive unit 600 includes a driven gear 601 fixed to the top of the threaded cylinder 201, a motor 602 fixed to the frustum mounting plate 200 with its output shaft pointing vertically downward, and a drive gear 603 fixed to the output shaft of the motor 602 and meshing with the driven gear 601 for transmission.

[0025] The method of using the steel cofferdam docking construction support device in this embodiment includes the following steps: S1. In the cofferdam processing plant, by measuring and positioning, upper mounting base 203 and lower mounting base 402 are installed between cofferdam segments; wherein, the upper mounting base 203 is fixedly connected to the wall plate of the upper cofferdam segment by bolts, and the lower mounting base 402 is fixedly connected to the wall plate of the lower cofferdam segment by bolts. S2. After pulling out the baffle 204 through the handle 2041, install the upper connecting seat 202 into the upper mounting seat 203, and then insert the baffle 204 into the upper mounting seat 203 through the handle 2041; at the same time, install the lower connecting seat 401 into the lower mounting seat 402 through the opening at the top of the lower mounting seat 402. S3. Hoist the lower section of the cofferdam to the design position, and transport the upper section of the cofferdam to the construction site by barge and floating crane, ready for hoisting work; start motor 602, which drives the threaded cylinder 201 to rotate through the drive gear 603 and driven gear 601, and adjust the distance between the truncated disc mounting plate 200 and the positioning truncated disc 100 to the maximum to facilitate the alignment and positioning of subsequent cofferdam sections; at the same time, control the hydraulic rod 205 to extend until the positioning truncated disc 100 is in contact with the limiting collar 301; S4. The lower section of the cofferdam is hoisted by a floating crane, and the upper and lower sections of the cofferdam are initially connected and positioned by the positioning bucket 500 and the positioning platform 100, thereby achieving temporary fixation of the upper and lower sections of the cofferdam. S5. Start motor 602. Motor 602 drives threaded cylinder 201 to rotate through drive gear 603 and driven gear 601, so that the upper cofferdam continues to be lowered smoothly until threaded column 300 reaches the design position, realizing the initial docking of the upper and lower cofferdams; then the hydraulic rod 205 controls the reserved gap between the upper and lower cofferdams, and manual on-site inspection is carried out to correct the processing errors and deformations at the docking position of the cofferdam segments; S6. After the repairs are completed, control the hydraulic rod 205 to retract, so that the upper section of the cofferdam can continue to be lowered, thereby accurately assembling the upper section of the cofferdam onto the lower section of the cofferdam, and then carry out welding construction; S7. Remove the upper mounting base 203, upper connecting base 202, lower mounting base 402 and lower connecting base 401, and repeat S1-S6 until all cofferdam segments are assembled.

[0026] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations.

Claims

1. A support device for the construction of steel cofferdams, characterized in that, include: Positioning the frustum; A frustum mounting plate is positioned horizontally above the positioning frustum, and a threaded cylinder is provided on the bottom surface of the frustum mounting plate for rotatable connection thereto; an upper connecting seat is fixedly connected to one end of the frustum mounting plate, and an upper mounting seat is provided on the upper connecting seat for sliding guide cooperation thereto; The bottom is rotatably connected to the top surface of the positioning frustum, and the threaded column is threadedly engaged with the threaded cylinder and extends upward through the frustum mounting plate. A funnel mounting base is located below the positioning truncated cone. A lower connecting base is fixedly connected to one side of the funnel mounting base. The lower connecting base is provided with a lower mounting base that slides and guides it. A positioning hopper is fixed to the top of the funnel mounting base and corresponds to the positioning frustum; wherein... The threaded column has at least two axial grooves symmetrically formed on its side surface; the frustum mounting plate has protrusions corresponding to the grooves. The top of the upper mounting base is closed, and a baffle is slidably connected to the upper mounting base near the bottom. One end of the baffle extends through and out of the upper mounting base and is fixedly connected to a handle. The bottom of the lower mounting base is sealed, and the top is provided with an opening. A movable rod is slidably connected to the center of the positioning frustum, and a spring with its top fixed to the bottom of the positioning frustum is sleeved on the movable rod; a hemispherical guide head is fixed to the bottom of the movable rod, and the guide head is fixedly connected to the bottom of the spring. The support device for the steel cofferdam docking construction also includes a driving component, which includes a driven gear fixed to the top of the threaded cylinder, a motor fixed to the frustum mounting plate with its output shaft pointing vertically downward, and a driving gear fixed to the motor output shaft and meshing with the driven gear. The bottom surface of the threaded cylinder is fixedly connected to a plurality of evenly distributed hydraulic rods, and the bottom of each of the plurality of hydraulic rods is fixedly connected to a limiting collar sleeved on the threaded cylinder; the upper mounting seat is fixedly connected to the wall plate of the upper section of the cofferdam by bolts, and the lower mounting seat is fixedly connected to the wall plate of the lower section of the cofferdam by bolts.

2. The support device for steel cofferdam docking construction according to claim 1, characterized in that, The bottom of the positioning bucket has a central hole that penetrates through the positioning bucket, and a support block is fixed on the wall of the central hole.

3. The support device for steel cofferdam docking construction according to claim 1, characterized in that, The outer wall of the guide head is provided with a number of evenly distributed steel balls.

4. The support device for steel cofferdam docking construction according to claim 1, characterized in that, Multiple evenly distributed reinforcing ribs are fixedly connected between the positioning hopper and the funnel mounting base.

5. A method of using the support device for the steel cofferdam docking construction as described in claim 4, characterized in that, Includes the following steps: S1. Within the cofferdam processing plant, the upper mounting base and the lower mounting base are installed between cofferdam segments by measurement and positioning; S2. After pulling out the baffle using the handle, install the upper connecting seat into the upper mounting seat, and then insert the baffle into the upper mounting seat using the handle; at the same time, install the lower connecting seat into the lower mounting seat through the opening at the top of the lower mounting seat; S3. Hoist the lower section of the cofferdam to the designed position, and transport the upper section of the cofferdam to the construction site by barge and floating crane, ready for hoisting work; start the motor, which drives the threaded cylinder to rotate through the drive gear and driven gear, and adjust the distance between the truncated disc mounting plate and the positioning disc to the maximum; at the same time, control the extension of the hydraulic rod until the positioning disc fits with the limiting collar; S4. The upper section of the cofferdam is hoisted by a floating crane, and the upper and lower sections of the cofferdam are initially connected and positioned by the positioning bucket and positioning platform, thereby achieving temporary fixation of the upper and lower sections of the cofferdam. S5. Start the motor, which drives the threaded cylinder to rotate through the drive gear and driven gear, so that the upper section of the cofferdam continues to be lowered smoothly until the threaded column reaches the design position, realizing the initial docking of the upper and lower sections of the cofferdam; then the hydraulic rod controls the reserved gap between the upper and lower sections of the cofferdam, and manual on-site inspection is carried out to correct the processing errors and deformations at the docking position of the cofferdam segments; S6. After the repair is completed, control the hydraulic rod to retract, so that the upper section of the cofferdam can continue to be lowered, thereby accurately assembling the upper section of the cofferdam onto the lower section of the cofferdam for welding construction; S7. Remove the upper mounting base, upper connecting base, lower mounting base and lower connecting base, and repeat S1-S6 until all cofferdam segments are assembled.

Images