Downward-putting device for bottom-sealing-free hanging box cofferdam

Abstract

The utility model belongs to the field of bridge construction, and particularly relates to a descending device for a bottom-sealing-free hanging box cofferdam. According to the descending assembly, the center hole jack is adopted, the supporting feet with the avoiding space are matched, and the deformed steel bars with the first nuts and the second nuts are arranged at the specific positions, so that rapid and stable descending of the bottom-sealing-free hanging box cofferdam can be achieved by ingeniously utilizing cooperation of the parts. By means of the design, the technical problems that a traditional vertical jack is low in lowering efficiency and poor in lowering stability are solved, meanwhile, the lowering device is simpler in structure, the lowering process is simpler and more convenient, and operability is higher. Through the design that at least one set of supporting feet and a center hole jack are oppositely arranged on the mounting platform, the lowering stability of the lowering assembly can be further improved, and it is ensured that the hanging box cofferdam is stably lowered in the axial direction of the pile casing.

Description

Technical Field

[0001] The present application belongs to the field of bridge construction, and specifically relates to a lowering device for a bottomless hanging box cofferdam. Background Art

[0002] A bottomless box cofferdam, a protective structure used in deepwater bridge abutments and pier construction, primarily consists of a box base, multiple sets of casings extending through the base, and a cofferdam surrounding the base. Currently, bottomless box cofferdams are lowered using a variety of methods, including a large-scale floating crane, a gantry crane mounted on a drilling platform, an automated chain guide system, and jacks.

[0003] The lowering of large-tonnage floating cranes, gantry cranes installed on drilling platforms, or automated chain guide systems is limited by factors such as the operating environment, navigation requirements, and the weight being lowered. This leads to drawbacks such as difficult layout and installation, high operating costs, and the inability to lower heavy-weight box cofferdams. Therefore, jacks are often used to quickly lower heavy steel-concrete composite box cofferdams in ultra-deepwater environments with high tidal ranges.

[0004] The existing jack lowering device mainly includes a connecting assembly arranged above the casing, a shoulder beam arranged on the connecting assembly, and a jack assembly fixed on the outside of the shoulder beam. The jack assembly includes a vertical jack, two mounting beams arranged at the upper and lower ends of the vertical jack, and high-quality rolled threaded steel bars that pass through the mounting beams and are fixed to the bottom plate of the hanging box. Specifically, there are two common structural designs for jack assemblies. One is to set two groups of vertical jacks between the two mounting beams, and the high-quality rolled threaded steel bars are only set as one group that passes through the middle of the two mounting beams; the other is to set only one group of vertical jacks in the middle of the two mounting beams, and two groups of high-quality rolled threaded steel bars are set to pass through both sides of the two mounting beams respectively. During use, through the cooperation between multiple groups of vertical jacks and high-quality rolled threaded steel bars on the casing, the tension-gravity action and reaction force of the jacks and the hanging box cofferdam are used to realize the lowering of the hanging box cofferdam along the axial direction of the casing. However, the applicant's research revealed that, in a single jack assembly, whether designing two sets of vertical jacks or two sets of fine-rolled rebar, the synchronization requirements between the jacks and the fine-rolled rebar during lowering are extremely high. Once the synchronization difference between the two reaches a certain threshold, the shoulder beam is prone to tilting or deformation. Due to the fixed relationship between the fine-rolled rebar, the shoulder beam, and even the bottom plate of the hoisting box, driven by the fine-rolled rebar, is prone to collision with the casing, affecting construction conditions and safety. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a lowering device for a bottomless hanging box cofferdam, which is specifically achieved through the following technical solutions:

[0006] A lowering device for a bottomless hanging box cofferdam comprises: a height connection component for connecting with the casing of the hanging box cofferdam; a shoulder pole component arranged on the height connection component and comprising a mounting platform protruding from the height connection component; a lowering component comprising supporting legs oppositely distributed on the mounting platform; a through-type jack being provided on the supporting legs; the lowering component further comprises threaded steel bars passing through the through-type jack and the supporting legs; a first nut and a second nut are provided on the threaded steel bars; the first nut is distributed above the through-type jack, and the second nut is arranged in the supporting legs; the supporting legs are provided with an escape space for a user to rotate the second nut.

[0007] Preferably, the support leg includes a first surface, and the first surface is provided with a top groove for fixing the lower end of the through-type jack.

[0008] Preferably, the support leg includes a second surface connected to the mounting platform, and the second surface is used for being engaged with a second nut.

[0009] Preferably, a clamping platform for clamping with the second nut is further provided on the second surface.

[0010] Preferably, the avoidance space is arranged opposite to the side of the supporting leg.

[0011] Preferably, the shoulder pole assembly is arranged through the heightening assembly.

[0012] Preferably, the shoulder pole assembly is a cross-shaped shoulder pole beam.

[0013] Preferably, the lowering device further comprises a working platform arranged at the upper end of the connecting assembly; the cross-shaped shoulder pole beam is arranged on the working platform.

[0014] Preferably, the working platform is square, and the mounting platforms of the cross-shaped shoulder beam are arranged at the four corners of the working platform.

[0015] Preferably, the length of the threaded steel bar inside the support leg is greater than or equal to the fall height difference of the through-type jack.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] The lowering assembly of this application utilizes a through-type jack, equipped with a support leg with a clearance, and threaded steel bars with first and second nuts positioned at specific locations. This cleverly utilizes the synergistic coordination between these components to achieve rapid and stable lowering of a bottomless hanging box cofferdam. This design not only solves the technical problems of low lowering efficiency and poor lowering stability caused by the traditional vertical jack's reliance on two mounting beams and threaded steel bars, but also streamlines the lowering device's structure, simplifies the lowering process, and improves operability.

[0018] This application can further improve the stability of the lowering assembly by arranging at least one set of support legs and through-type jacks in opposite directions on the installation platform, ensure that the hanging box cofferdam is lowered smoothly along the axial direction of the casing, and avoid collision between the bottom plate of the hanging box and the casing. Therefore, the construction conditions are better and the operation is safer.

[0019] By setting a top groove on the first surface of the support leg, the present application can use the fixed relationship between the support leg and the installation platform to fix the through-type jack more stably on the installation platform, further increase the stability of the lowering component operation, and improve the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to clearly illustrate the drawings, the drawings are briefly introduced below:

[0021] Figure 1 This is a schematic diagram of the overall structure of the lowering device;

[0022] Figure 2 It is a structural diagram of the lowering component;

[0023] Figure 3 This is a structural diagram of the support leg;

[0024] Figure numerals: 100, heightening assembly, 200, shoulder pole assembly, 210, installation platform, 300, lowering assembly, 310, support leg, 311, first surface, 312, top groove, 313, second surface, 314, clamping platform, 320, through-type jack, 330, threaded steel bar, 331, first nut, 332, second nut, 400, working platform. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Based on these descriptions, a person skilled in the art will be able to implement the present invention. Furthermore, the embodiments of the present invention described below generally represent only a portion of the present invention, rather than all of the embodiments. Therefore, all other embodiments derived by a person skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0026] Example 1

[0027] This embodiment discloses a lowering device for a bottomless hanging box cofferdam, comprising:

[0028] The connecting assembly 100 is used to connect with the casing of the hanging box cofferdam. The working platform 400 is arranged on the upper end of the connecting assembly 100 and is square in shape, with four sides protruding from the connecting assembly 100.

[0029] The shoulder pole assembly 200 is disposed on the work platform 400. In this embodiment, the shoulder pole assembly 200 is a cross-shaped shoulder pole beam, and the four ends of the cross-shaped shoulder pole beam are disposed at the four corners of the work platform 400. The cross-shaped shoulder pole beam protrudes from the position of the connecting assembly 100 to form a mounting platform 210.

[0030] The lowering assembly 300 includes two sets of legs 310 distributed oppositely on the mounting platform 210; a through-type jack 320 is provided on any of the legs 310; the lowering assembly 300 also includes a threaded steel bar 330 that passes through the through-type jack 320, the legs 310, and the mounting platform 210; a first nut 331 and a second nut 332 are provided on the threaded steel bar 330; the first nut 331 is distributed above the through-type jack 320, and the second nut 332 is provided in the legs 310; the legs 310 are provided with an escape space for the user to rotate the second nut 332. The escape space is provided opposite to the side of the legs 310. In addition, the length of the threaded steel bar 330 inside the legs 310 is greater than or equal to the return height difference of the through-type jack 320.

[0031] Specifically, the support leg 310 includes a first surface 311 having a top groove 312 for securing the lower end of the through-type jack 320. The support leg 310 also includes a second surface 313 connected to the mounting platform 210, and the second surface 313 is configured to engage with a second nut 332.

[0032] This embodiment also discloses a method for using the lowering device for the bottomless hanging box cofferdam, which specifically includes the following steps:

[0033] S1. Lift the through-type jack 320. After the through-type jack 320 lifts the cofferdam of the hanging box a certain distance, close the lifting device of the through-type jack 320, tighten the second nut 332 provided in the support leg 310 to the second surface 313 of the support leg, and lower the through-type jack 320 so that the first nut 331 and the second nut 332 above the through-type jack 320 are subjected to the force together.

[0034] S2. After checking that the box cofferdam is normal and removing the support beam under the box bottom plate, continue to raise the through-type jack 320 to a certain height, rotate the second nut 332 in the support leg 310 upward to a suitable position, lower the through-type jack 320, and slowly lower the box cofferdam until the second nut 332 contacts the second surface 313.

[0035] S3. After the first nut 331 above the through-type jack 320 is lifted and the stroke is completely returned, screw all the nuts above the through-type jack 320 upward to the appropriate position; lift the through-type jack 320 to a certain height, screw the second nut 332 in the support leg upward to the appropriate position, lower the through-type jack 320 to make the second nut 332 of the support leg bear the force, then screw all the first nuts 331 above the through-type jack 320 upward to the maximum position, lift the jack, and repeat this cycle to slowly and synchronously lower the hanging box cofferdam as a whole to the designed elevation.

[0036] Example 2

[0037] This embodiment differs from Example 1 in that it does not include a work platform 400; instead, the cross-shaped shoulder beam extends through the connecting assembly 100. Furthermore, in this embodiment, a latching platform 314 is provided on the second surface 313 for latching with the second nut 332. The latching platform 314 facilitates the rotation of the second nut 332, making the lowering operation more convenient.

[0038] Example 3

[0039] The only difference between this embodiment and the first embodiment is that the supporting legs 310 are relatively arranged as a group.

Claims

1. A device for lowering a cofferdam without a bottom cover, characterized in that: include: A connecting assembly (100) is used to connect with the casing of the hanging box cofferdam; A shoulder pole assembly (200) is provided on the connecting assembly (100), and includes a mounting platform (210) protruding from the connecting assembly (100); A lowering assembly (300) comprises supporting legs (310) oppositely distributed on a mounting platform (210); a through-type jack (320) is provided on the supporting legs (310); the lowering assembly (300) further comprises a threaded steel bar (330) passing through the through-type jack (320), the supporting legs (310) and the mounting platform (210); a first nut (331) and a second nut (332) are provided on the threaded steel bar (330); the first nut (331) is distributed above the through-type jack (320), and the second nut (332) is provided in the supporting legs (310); and the supporting legs (310) are provided with an escape space for a user to rotate the second nut (332).

2. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The support leg (310) comprises a first surface (311), and the first surface (311) is provided with a top groove (312) for fixing the lower end of the through-type jack (320).

3. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The support leg (310) comprises a second surface (313) connected to the mounting platform (210), and the second surface (313) is used for being engaged with a second nut (332).

4. The lowering device for a bottomless hanging box cofferdam according to claim 3, characterized in that: The second surface (313) is also provided with a clamping platform (314) for clamping with the second nut (332).

5. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The avoidance space is arranged opposite to the side of the support leg (310).

6. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The shoulder pole assembly (200) is disposed through the connecting assembly (100).

7. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The shoulder pole assembly (200) is a cross-shaped shoulder pole beam.

8. The lowering device for a bottomless hanging box cofferdam according to claim 7, characterized in that: The lowering device further comprises a working platform (400) arranged at the upper end of the connecting assembly (100); the cross-shaped shoulder beam is arranged on the working platform (400).

9. The lowering device for a bottomless hanging box cofferdam according to claim 8, characterized in that: The working platform (400) is square, and the installation platforms (210) of the cross-shaped shoulder beam are arranged at the four corners of the working platform (400).

10. The lowering device for a bottomless hanging box cofferdam according to claim 1, characterized in that: The length of the threaded steel bar (330) inside the support leg (310) is greater than or equal to the fall height difference of the through-type jack (320).

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