Synchronous lowering system for steel cofferdam in underwater bearing platform construction

Abstract

The invention belongs to the technical field of bridge engineering underwater bearing platform construction, and particularly relates to an underwater bearing platform construction steel cofferdam synchronous lowering system which comprises an underwater bearing platform and a pile foundation arranged on the underwater bearing platform. The device comprises a bottom plate bearing beam, side plates arranged on the bottom plate bearing beam, a lowering beam arranged on a pile foundation, hydraulic jacks arranged on the lowering beam, a steel strand, a driving module, a sensing module, a control module and a remote monitoring system, and the four hydraulic jacks are distributed and installed above the lowering beam in a ring array mode. According to the synchronous lowering system for the underwater bearing platform construction steel cofferdam, the sensing module, the control module and the remote monitoring system are arranged, so that the control module controls all the hydraulic jacks through a computer, meanwhile, the computer collects the lowering stroke of each hydraulic jack in real time through the sensing module, and according to the lowering error, the lowering stroke of each hydraulic jack is calculated. The descending heights of all the hydraulic jacks in the next stroke can be adjusted in a unified mode, the descending stroke of a certain hydraulic jack can also be adjusted independently, and synchronism is good.

Description

Technical Field

[0001] The invention relates to the technical field of underwater pier construction of bridge engineering, and in particular to a synchronous lowering system of steel cofferdam for underwater pier construction. Background Art

[0002] Steel cofferdam is a method of underwater pedestal construction. The lowering of steel cofferdam is an important process in the construction of steel cofferdam. Due to the different scales of pedestals, the lowering methods of solid steel cofferdam are also different. The traditional lowering process of steel hanging box cofferdam is to use a suspension system to lower the hanging box as a whole, use ordinary through-hole jacks as lifting equipment, and use fine-rolled threaded steel as hangers. Set lowering points and fixed hanging points on the top of the suspension beam. The lowering hanging points are connected to the jacks. During the lowering process, the fixed hanging point nuts are loosened, and the deadweight of the steel hanging box is borne by the lowering hanging points. After the jack has a stroke in place, tighten the fixed hanging point nuts and loosen the lowering hanging point nuts. At this time, the deadweight of the steel hanging box is transferred from the lowering hanging point to the fixed hanging point, and then the jack returns to the oil and empty the top for a stroke. Repeat the above steps until the steel hanging box is lowered into place.

[0003] When the steel box cofferdam is lowered using the traditional process, the following measures are usually taken to ensure synchronization of the lowering: (1) assigning a dedicated person to take unified command and using a whistle as a command to start or stop the lowering; (2) manually drawing scale lines on the fine-rolled rebar to control the single lowering height of the jack; (3) using an oil pump to control 2 to 3 jacks.

[0004] However, due to manual operation errors, equipment errors such as jacks and oil pumps, the overall lowering synchronization and uniformity are difficult to ensure, and the fine-rolled rebar has poor ductility, which can easily cause local concentrated force and form safety hazards when it is lowered unevenly. Therefore, a synchronous lowering system for steel cofferdams in underwater cap construction is proposed. Summary of the invention

[0005] Based on the technical problems that the existing underwater pedestal construction adopts manual lowering of steel cofferdams, which makes its lowering speed slow, increases the construction time, and easily leads to uneven lowering, thus causing safety hazards, the present invention proposes a synchronous lowering system for steel cofferdams in underwater pedestal construction.

[0006] The present invention proposes a synchronous lowering system for steel cofferdam construction in an underwater pedestal, comprising an underwater pedestal, a pile foundation arranged on the underwater pedestal, a bottom plate load-bearing beam, a side plate arranged on the bottom plate load-bearing beam, a lowering beam arranged on the pile foundation, a hydraulic jack arranged on the lowering beam, a steel strand, a drive module, a sensor module, a control module and a remote monitoring system, wherein four hydraulic jacks are installed in a ring array above the lowering beam, an installation mechanism is arranged inside the lowering beam, one end of the steel strand is connected to the piston rod of the hydraulic jack, and a connecting mechanism is arranged at the free end of the steel strand.

[0007] Wherein, the installation mechanism is used to connect the lowering beam and the pile foundation together.

[0008] Among them, the connecting mechanism includes a cylindrical shell and a reserved hole, the top of the cylindrical shell is fixedly connected to the free end of the steel strand, and a plurality of the reserved holes are opened through the bottom plate load-bearing beam, and the steel strand is connected to the bottom plate load-bearing beam through the sliding engagement between the surface of the cylindrical shell and the inner wall of the reserved hole.

[0009] Preferably, the surface of the pile foundation is provided with steel corbels in a circular array, a supporting frame is fixedly installed above the steel corbels, the bottom plate load-bearing beam is fixedly installed on the supporting frame, and pile holes are opened through the surface of the bottom plate load-bearing beam, and the surface of the pile foundation is slidably connected to the inner wall of the pile hole.

[0010] Through the above technical solution, the bottom plate load-bearing beam is responsible for bearing the weight from the upper structure and transferring the weight to the supporting frame and steel corbels. At the same time, the setting of the pile holes facilitates the movement of the bottom plate load-bearing beam, thereby driving the steel hanging box to be lowered.

[0011] Preferably, positioning steels are installed on the outer surface of the bottom plate load-bearing beam in a rectangular array, and the surface of the side plate is in sliding contact with the surface of the positioning steel.

[0012] Through the above technical solution, the positioning steel is used to locate the position of the side panel, realize the precise positioning and layout of the side panel edge line, and prevent the bottom of the side panel from expanding outward when the bottom concrete is poured.

[0013] Preferably, the mounting mechanism comprises positioning grooves distributed in a circular array on the surface of the pile foundation, the lower surface of the lowering beam is provided with grooves distributed in a circular array, the surface of the lowering beam is slidably engaged with the inner wall of the positioning groove, and the surface of the pile foundation is slidably connected with the inner wall of the groove.

[0014] Through the above technical solution, the positioning groove and the groove position the lowered beam, so that the lowered beam is connected to the pile foundation.

[0015] Preferably, a driving motor is fixedly installed inside the lowering beam, and one end of the output shaft of the driving motor is fixedly sleeved with a driving helical gear through a rotating shaft. The rotating shaft is installed on the inner wall of the lowering beam through a bearing. Two bidirectional lead screws are respectively installed on the inner wall of the lowering beam through bearings. The middle ends of the two bidirectional lead screws are sleeved with driven helical gears, and one of the driven helical gears is meshed with the driving helical gear.

[0016] Through the above technical solution, the rotation of the output shaft of the driving motor drives the rotating shaft connected to it to rotate, the rotation of the rotating shaft drives the active helical gear to rotate, the rotation of the active helical gear drives the driven helical gear meshing with it to rotate, the rotation of the driven helical gear drives another driven helical gear to rotate, thereby causing the two bidirectional lead screws to rotate.

[0017] Preferably, two threaded blocks are respectively threadedly sleeved on the surfaces of the two bidirectional screws, and the surfaces of the four threaded blocks on one side away from the driven helical gear are fixedly connected to a limiting plate, and the end of the limiting plate away from the threaded block is fixedly connected to a clamping column, a through hole is provided on the surface of the lowering beam, a limiting sliding groove is provided inside the lowering beam, the through hole is connected to the limiting sliding groove, the surface of the limiting plate is slidably connected to the inner wall of the limiting sliding groove, the surface of the clamping column is slidably connected to the inner wall of the through hole, and the through hole extends through the pile foundation surface.

[0018] Through the above technical scheme, the rotation of the two bidirectional lead screws respectively drives the two threaded blocks connected thereto to move relative to each other on their surfaces. The movement of the threaded blocks drives the limit plate to move along the inner wall of the limit slide groove. The movement of the limit plate drives the clamping column to move along the inner wall of the perforation. Through the connection between the clamping column and the perforation on the pile foundation, the lowering beam is installed on the pile foundation.

[0019] Preferably, a clamping sleeve is provided between each of the four lowering beams, the inner wall of the clamping sleeve is slidably connected to the surface of the pile foundation, and T-shaped connecting plates are fixedly installed on the opposite side surfaces of two lowering beams located in the same horizontal plane, and one side surface of the two T-shaped connecting plates is fixedly connected to the outer surface of the clamping sleeve, and the sensor module is installed on the lower surface of the clamping sleeve, and the sensor module includes a displacement sensor.

[0020] Through the above technical solution, the displacement sensor is used to monitor the displacement of the bottom plate load-bearing beam to ensure that it is lowered according to the predetermined trajectory, thereby accurately controlling the lowering height and providing real-time data. The clamping sleeve is connected to the pile foundation surface between the two lowered beams to facilitate positioning.

[0021] Preferably, the connection mechanism further comprises a turntable mounted on the bottom of the cylindrical shell via a bearing, a servo motor is fixedly mounted inside the cylindrical shell, and one end of the output shaft of the servo motor is fixedly sleeved with the axis of the turntable.

[0022] Through the above technical solution, the rotation of the servo motor output shaft drives the turntable connected thereto to rotate.

[0023] Preferably, the upper surface of the turntable is provided with inclined grooves distributed in a circular array, the inner wall of the inclined groove is slidably connected with a sliding rod, the lower end of the sliding rod is fixedly connected with a clamping plate, and the upper surface of the clamping plate is in sliding contact with the lower surface of the bottom plate load-bearing beam.

[0024] Through the above technical solution, the rotation of the turntable drives the slide bar to move along the inner wall of the inclined groove, and the movement of the slide bar drives the clamping plate to move and contact the bottom plate load-bearing beam, thereby connecting the columnar shell and the bottom plate load-bearing beam together.

[0025] Preferably, a support plate is installed at the bottom of the turntable via a bearing, and the upper surface of the support plate is provided with limiting grooves distributed in a ring array, and the surface of the clamping plate is slidably engaged with the inner wall of the limiting groove.

[0026] Through the above technical solution, the movement of the slide rod drives the clamping plate to move along the inner wall of the limiting groove.

[0027] The beneficial effects of the present invention are:

[0028] 1. By setting up the installation mechanism, it is convenient to quickly disassemble and assemble the lowering beam and the pile foundation. The rotation of the output shaft of the driving motor drives the rotation of the active helical gear, thereby driving the rotation of the driven helical gear, and then driving the two bidirectional lead screws to rotate, so that the clamping column passes through the through hole of the lowering beam and is connected with the through hole on the pile foundation, so as to achieve the effect of quick disassembly and assembly.

[0029] 2. By setting up a connecting mechanism, it is convenient to connect the steel strands with the bottom plate load-bearing beam to realize the lowering action. The rotation of the servo motor output shaft and the distribution of the inclined groove and the limit groove make the clamping plate slide in contact with the lower surface of the bottom plate load-bearing beam, thereby driving the columnar shell and the bottom plate load-bearing beam to be installed together to achieve a quick connection effect.

[0030] 3. By setting up the sensor module, control module and remote monitoring system, the control module controls all the hydraulic jacks through a computer. At the same time, the computer collects the lowering stroke of each hydraulic jack in real time through the sensor module. According to the lowering error, the lowering height of all hydraulic jacks can be uniformly adjusted for the next stroke, and the lowering stroke of a certain hydraulic jack can also be adjusted individually, with good synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a synchronous lowering system for steel cofferdams for underwater cap construction proposed by the present invention;

[0032] Figure 2 A three-dimensional diagram of the positioning steel structure of a synchronous lowering system for steel cofferdams for underwater pedestal construction proposed by the present invention;

[0033] Figure 3 A three-dimensional diagram of the bottom plate bearing beam structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0034] Figure 4A three-dimensional diagram of the T-shaped connecting plate structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0035] Figure 5 A stereoscopic diagram of a sleeve structure of a synchronous lowering system for steel cofferdams for underwater pedestal construction proposed by the present invention;

[0036] Figure 6 A three-dimensional diagram of the displacement sensor structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0037] Figure 7 A three-dimensional diagram of the column structure of a synchronous lowering system for steel cofferdams in underwater cap construction proposed by the present invention;

[0038] Figure 8 A three-dimensional diagram of the driving motor structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0039] Fig. 9 A three-dimensional diagram of the bidirectional screw structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0040] Fig.10 A three-dimensional diagram of the positioning groove structure of a synchronous lowering system for steel cofferdams in underwater pedestal construction proposed by the present invention;

[0041] Fig.11 A three-dimensional diagram of the cylindrical shell structure of a synchronous lowering system for steel cofferdams for underwater pedestal construction proposed by the present invention;

[0042] Fig.12 A three-dimensional diagram of the servo motor structure of a synchronous lowering system for steel cofferdams in underwater cap construction proposed by the present invention;

[0043] Fig.13 This is a three-dimensional diagram of the limit groove structure of the synchronous lowering system of the steel cofferdam for underwater pedestal construction proposed by the present invention.

[0044] In the figure: 1. underwater pedestal; 2. pile foundation; 3. bottom plate load-bearing beam; 4. side plate; 5. lowering beam; 6. hydraulic jack; 7. steel strand; 8. positioning groove; 801. groove; 802. driving motor; 803. rotating shaft; 804. active helical gear; 805. bidirectional lead screw; 806. driven helical gear; 807. threaded block; 808. limit plate; 809. clamping column; 810. perforation; 811. limit slide; 9. cylindrical shell; 91. reserved hole; 92. turntable; 93. servo motor; 94. inclined groove; 95. slide rod; 96. clamping plate; 97. support plate; 98. limit groove; 10. steel corbel; 11. support frame; 12. pile hole; 13. positioning steel; 14. clamping sleeve; 15. T-shaped connecting plate; 16. displacement sensor. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] Reference Figure 1-Figure 13 A synchronous lowering system for steel cofferdam in underwater pedestal construction includes an underwater pedestal 1, a pile foundation 2 arranged on the underwater pedestal 1, a bottom plate bearing beam 3, a side plate 4 arranged on the bottom plate bearing beam 3, a lowering beam 5 arranged on the pile foundation 2, a hydraulic jack 6 arranged on the lowering beam 5, a steel strand 7, a driving module, a sensing module, a control module and a remote monitoring system, four hydraulic jacks 6 are installed above the lowering beam 5 in a ring array, an installation mechanism is arranged inside the lowering beam 5, one end of the steel strand 7 is connected to the piston rod of the hydraulic jack 6, and the free end of the steel strand 7 is provided with a connecting mechanism.

[0047] By setting up a sensor module, a control module and a remote monitoring system, the control module controls all the hydraulic jacks 6 through a computer. At the same time, the computer collects the lowering stroke of each hydraulic jack 6 in real time through the sensor module. According to the lowering error, the lowering height of the next stroke of all hydraulic jacks 6 can be uniformly adjusted, and the lowering stroke of a certain hydraulic jack 6 can also be adjusted individually, with good synchronization.

[0048] In order to facilitate the installation of the side panels 4, steel corbels 10 are distributed in a circular array on the surface of the pile foundation 2, and a supporting frame 11 is fixedly installed above the steel corbels 10. The bottom plate load-bearing beam 3 is fixedly installed on the supporting frame 11. Pile holes 12 are opened on the surface of the bottom plate load-bearing beam 3. The surface of the pile foundation 2 is slidably connected to the inner wall of the pile hole 12. The weight from the upper structure is borne by the bottom plate load-bearing beam 3, and the weight is transferred to the supporting frame 11 and the steel corbel 10. At the same time, the setting of the pile holes 12 facilitates the movement of the bottom plate load-bearing beam 3, thereby driving the steel hanging box to be lowered.

[0049] In order to facilitate the installation of the side panels 4, positioning steels 13 are installed in a rectangular array on the outer surface of the bottom plate load-bearing beam 3. The surface of the side panels 4 is in sliding contact with the surface of the positioning steels 13. The side panels 4 are positioned by the positioning steels 13 to achieve precise positioning and layout of the side panels 4 edge lines, while preventing the bottom of the side panels 4 from expanding outward when the bottom concrete is poured.

[0050] In order to monitor the lowering process, a sleeve 14 is provided between each of the four lowering beams 5. The inner wall of the sleeve 14 is slidably sleeved with the surface of the pile foundation 2. A T-shaped connecting plate 15 is fixedly installed on the opposite side surface of the two lowering beams 5 located in the same horizontal plane. One side surface of the two T-shaped connecting plates 15 is fixedly connected with the outer surface of the sleeve 14. A sensor module is installed on the lower surface of the sleeve 14. The sensor module includes a displacement sensor 16. The displacement sensor 16 is used to monitor the displacement of the bottom plate load-bearing beam 3 to ensure that it is lowered according to a predetermined trajectory, thereby accurately controlling the lowering height and providing real-time data. The sleeve 14 is sleeved with the surface of the pile foundation 2 between the two lowering beams 5 for easy positioning.

[0051] Among them, in order to connect the lowering beam 5 with the pile foundation 2, the installation mechanism provided includes positioning grooves 8 distributed in a circular array on the surface of the pile foundation 2, and the lower surface of the lowering beam 5 is distributed in a circular array with grooves 801. The surface of the lowering beam 5 is slidably engaged with the inner wall of the positioning groove 8, and the surface of the pile foundation 2 is slidably connected with the inner wall of the groove 801. The lowering beam 5 is positioned by the positioning groove 8 and the groove 801, so that the lowering beam 5 is connected to the pile foundation 2.

[0052] In order to make the lowering beam 5 and the pile foundation 2 tightly connected together, a driving motor 802 is fixedly installed inside the lowering beam 5, and one end of the output shaft of the driving motor 802 is fixedly sleeved with a driving helical gear 804 through a rotating shaft 803. The rotating shaft 803 is installed on the inner wall of the lowering beam 5 through a bearing. Two bidirectional lead screws 805 are respectively installed on the inner wall of the lowering beam 5 through bearings. The middle ends of the two bidirectional lead screws 805 are sleeved with driven helical gears 806, one of which is meshed with the driving helical gear 804. The rotation of the output shaft of the driving motor 802 drives the rotating shaft 803 connected thereto to rotate, the rotation of the rotating shaft 803 drives the driving helical gear 804 to rotate, the rotation of the driving helical gear 804 drives the driven helical gear 806 meshed therewith to rotate, and the rotation of the driven helical gear 804 drives the driven helical gear 806 meshed therewith to rotate, and the rotation of the driven helical gear 806 drives the other driven helical gear 806 to rotate, thereby rotating the two bidirectional lead screws 805.

[0053] In order to install the lowering beam 5 and the pile foundation 2 together, two threaded blocks 807 are respectively threadedly sleeved on the surfaces of the two bidirectional lead screws 805, and the surfaces of the four threaded blocks 807 on the side away from the driven helical gear 806 are fixedly connected to the limiting plate 808, and the end of the limiting plate 808 away from the threaded block 807 is fixedly connected to the clamping column 809, and the surface of the lowering beam 5 is provided with a through hole 810, and the interior of the lowering beam 5 is provided with a limiting slide groove 811, and the through hole 810 is connected to the limiting slide groove 811, and the surface of the limiting plate 808 is connected to the inner surface of the limiting slide groove 811. The surface of the clamping column 809 is slidably connected to the inner wall of the through hole 810, and the through hole 810 extends through the surface of the pile foundation 2. The rotation of the two bidirectional lead screws 805 respectively drives the two threaded blocks 807 connected thereto to move relative to each other on their surfaces. The movement of the threaded block 807 drives the limit plate 808 to move along the inner wall of the limit slide groove 811. The movement of the limit plate 808 drives the clamping column 809 to move along the inner wall of the through hole 810. Through the connection between the clamping column 809 and the through hole 810 on the pile foundation 2, the lowering beam 5 is installed on the pile foundation 2.

[0054] By setting up the installation mechanism, it is convenient to quickly disassemble and assemble the lowering beam 5 and the pile foundation 2 together, and the rotation of the output shaft of the driving motor 802 drives the rotation of the active helical gear 804, thereby driving the rotation of the driven helical gear 806, and then driving the two bidirectional lead screws 805 to rotate, so that the clamping column 809 passes through the through hole 810 of the lowering beam 5 and is connected with the through hole 810 on the pile foundation 2, thereby achieving the effect of quick disassembly and assembly.

[0055] Among them, in order to connect the steel strand 7 with the bottom plate load-bearing beam 3, a connecting mechanism is set up, including a cylindrical shell 9 and a reserved hole 91. The top of the cylindrical shell 9 is fixedly connected to the free end of the steel strand 7. A plurality of reserved holes 91 are opened through the bottom plate load-bearing beam 3, and the surface of the cylindrical shell 9 is slidably engaged with the inner wall of the reserved hole 91.

[0056] In order to make the cylindrical shell 9 and the bottom plate load-bearing beam 3 tightly connected together, the connecting mechanism also includes a turntable 92 installed at the bottom of the cylindrical shell 9 through a bearing, a servo motor 93 is fixedly installed inside the cylindrical shell 9, one end of the output shaft of the servo motor 93 is fixedly sleeved with the axis of the turntable 92, and the upper surface of the turntable 92 is distributed in a ring array and is penetrated by inclined grooves 94, and the inner wall of the inclined groove 94 is slidably clamped with a slide bar 95, and the lower end of the slide bar 95 is fixedly connected with a clamping plate 96, and the upper surface of the clamping plate 96 is in sliding contact with the lower surface of the bottom plate load-bearing beam 3. A support plate 97 is installed at the bottom through a bearing, and limiting grooves 98 are arranged in a ring array on the upper surface of the support plate 97. The surface of the clamping plate 96 is slidably engaged with the inner wall of the limiting groove 98. The rotation of the output shaft of the servo motor 93 drives the turntable 92 connected thereto to rotate. The rotation of the turntable 92 drives the slide bar 95 to move along the inner wall of the inclined groove 94. The movement of the slide bar 95 drives the clamping plate 96 to move along the inner wall of the limiting groove 98, so that the clamping plate 96 slides and contacts with the bottom of the bottom plate load-bearing beam 3, thereby connecting the cylindrical shell 9 to the bottom plate load-bearing beam 3.

[0057] By setting up a connecting mechanism, it is convenient to connect the steel strand 7 with the bottom plate load-bearing beam 3 to realize the lowering action. The rotation of the output shaft of the servo motor 93 and the distribution of the inclined groove 94 and the limit groove 98 make the clamping plate 96 slide in contact with the lower surface of the bottom plate load-bearing beam 3, thereby driving the columnar shell 9 and the bottom plate load-bearing beam 3 to be installed together, achieving a quick connection effect.

[0058] Working principle: When in use, first weld the steel corbel 10 to the pile foundation 2 at a distance of 0.5 meters from the water surface, then hoist the support frame 11 onto the steel corbel 10 and connect them, then lay the bottom plate bearing beam 3 to make it a whole, then assemble the side plate 4 on the bottom plate bearing beam 3, and position the side plate 4 through the positioning steel 13;

[0059] Then, the lowering beam 5 is installed and plugged on the pile foundation 2 through the positioning groove 8 and the groove 801, and the driving motor 802 is started. The rotation of the output shaft of the driving motor 802 drives the rotating shaft 803 connected thereto to rotate, and the rotation of the rotating shaft 803 drives the active helical gear 804 to rotate. The rotation of the active helical gear 804 drives the driven helical gear 806 meshing therewith to rotate, and the rotation of the driven helical gear 806 drives another driven helical gear 806 to rotate, thereby causing the two bidirectional lead screws 805 to rotate. The rotation of the two bidirectional lead screws 805 drives the two threaded blocks 807 connected thereto to move relative to each other on their surfaces. The movement of the threaded blocks 807 drives the limit plate 808 to move along the inner wall of the limit slide groove 811. The movement of the limit plate 808 drives the clamping column 809 to move along the inner wall of the through hole 810. The connection between the clamping column 809 and the through hole 810 on the pile foundation 2 enables the lowering beam 5 to be installed on the pile foundation 2. At the same time, as the lowering beam 5 is installed, the clamping sleeve 14 is sleeved on the pile foundation 2 through the T-shaped connecting plate 15.

[0060] At the same time, the steel strand 7 inserts the columnar housing 9 into the reserved hole 91 of the bottom plate bearing beam 3, and starts the servo motor 93. The rotation of the output shaft of the servo motor 93 drives the turntable 92 connected thereto to rotate, and the rotation of the turntable 92 drives the slide bar 95 to move along the inner wall of the inclined groove 94. The movement of the slide bar 95 drives the clamping plate 96 to move along the inner wall of the limit groove 98, so that the clamping plate 96 slides and contacts with the bottom of the bottom plate bearing beam 3, thereby connecting the columnar housing 9 and the bottom plate bearing beam 3 together;

[0061] During lowering, all the hydraulic jacks 6 are controlled by a computer through a control module and a remote monitoring system, and the driving module controls the operation of the hydraulic jacks 6. At the same time, the computer collects the lowering stroke of each hydraulic jack 6 in real time through the sensor module. According to the lowering error, the lowering height of the next stroke of all hydraulic jacks 6 can be uniformly adjusted, and the lowering stroke of a certain hydraulic jack 6 can also be adjusted individually, with good synchronization.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A synchronous lowering system for steel cofferdam in underwater cap construction, characterized by: The invention comprises an underwater bearing platform (1), a pile foundation (2) arranged on the underwater bearing platform (1), a bottom plate bearing beam (3), a side plate (4) arranged on the bottom plate bearing beam (3), a lowering beam (5) arranged on the pile foundation (2), a hydraulic jack (6) arranged on the lowering beam (5), a steel strand (7), a driving module, a sensor module, a control module and a remote monitoring system, wherein four hydraulic jacks (6) are arranged in a ring array above the lowering beam (5), a mounting mechanism is arranged inside the lowering beam (5), one end of the steel strand (7) is connected to the piston rod of the hydraulic jack (6), and a connecting mechanism is arranged at the free end of the steel strand (7); Wherein, the mounting mechanism is used to connect the lowering beam (5) and the pile foundation (2); The connection mechanism comprises a columnar shell (9) and a reserved hole (91), the top of the columnar shell (9) is fixedly connected to the free end of the steel strand (7), a plurality of the reserved holes (91) are penetrated and opened on the bottom plate load-bearing beam (3), and the steel strand (7) is connected to the bottom plate load-bearing beam (3) by slidingly engaging the surface of the columnar shell (9) with the inner wall of the reserved hole (91).

2. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 1 is characterized in that: The surface of the pile foundation (2) is provided with steel brackets (10) distributed in a circular array, a support frame (11) is fixedly installed above the steel brackets (10), the bottom plate load-bearing beam (3) is fixedly installed on the support frame (11), and a pile hole (12) is opened through the surface of the bottom plate load-bearing beam (3), and the surface of the pile foundation (2) is slidably connected to the inner wall of the pile hole (12).

3. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 1 is characterized in that: Positioning steels (13) are installed on the outer surface of the bottom plate load-bearing beam (3) in a rectangular array, and the surface of the side plate (4) is in sliding contact with the surface of the positioning steels (13).

4. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 1 is characterized in that: The installation mechanism comprises positioning grooves (8) distributed in an annular array on the surface of the pile foundation (2); the lower surface of the lowering beam (5) is provided with grooves (801) distributed in an annular array; the surface of the lowering beam (5) is slidably engaged with the inner wall of the positioning groove (8); and the surface of the pile foundation (2) is slidably connected with the inner wall of the groove (801).

5. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 4 is characterized in that: A driving motor (802) is fixedly installed inside the lowering beam (5); one end of the output shaft of the driving motor (802) is fixedly sleeved with a driving helical gear (804) via a rotating shaft (803); the rotating shaft (803) is installed on the inner wall of the lowering beam (5) via a bearing; two bidirectional lead screws (805) are respectively installed on the inner wall of the lowering beam (5) via bearings; the middle ends of the two bidirectional lead screws (805) are sleeved with a driven helical gear (806), and one of the driven helical gears (806) is meshed with the driving helical gear (804).

6. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 5 is characterized by: Two threaded blocks (807) are respectively threadedly sleeved on the surfaces of the two bidirectional lead screws (805); the surfaces of the four threaded blocks (807) on one side away from the driven helical gear (806) are fixedly connected to a limiting plate (808); one end of the limiting plate (808) away from the threaded block (807) is fixedly connected to a clamping column (809); a through hole (810) is provided on the surface of the lowering beam (5); a limiting sliding groove (811) is provided inside the lowering beam (5); the through hole (810) is communicated with the limiting sliding groove (811); the surface of the limiting plate (808) is slidably connected to the inner wall of the limiting sliding groove (811); the surface of the clamping column (809) is slidably connected to the inner wall of the through hole (810); and the through hole (810) extends through the surface of the pile foundation (2).

7. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 1 is characterized by: A clamping sleeve (14) is arranged between each of the four lowering beams (5), the inner wall of the clamping sleeve (14) is slidably connected to the surface of the pile foundation (2), a T-shaped connecting plate (15) is fixedly installed on the surface of the opposite side of two lowering beams (5) located in the same horizontal plane, one side surface of the two T-shaped connecting plates (15) is fixedly connected to the outer surface of the clamping sleeve (14), and the sensor module is installed on the lower surface of the clamping sleeve (14), and the sensor module includes a displacement sensor (16).

8. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 7 is characterized in that: The connection mechanism also includes a turntable (92) mounted at the bottom of the cylindrical housing (9) via a bearing, a servo motor (93) is fixedly mounted inside the cylindrical housing (9), and one end of the output shaft of the servo motor (93) is fixedly sleeved with the axis of the turntable (92).

9. The synchronous lowering system of steel cofferdam for underwater platform construction according to claim 8, characterized in that: The upper surface of the turntable (92) is provided with inclined grooves (94) distributed in a circular array, and the inner wall of the inclined groove (94) is slidably connected with a sliding rod (95), and the lower end of the sliding rod (95) is fixedly connected with a clamping plate (96), and the upper surface of the clamping plate (96) is in sliding contact with the lower surface of the bottom plate load-bearing beam (3).

10. A synchronous lowering system for steel cofferdam in underwater platform construction according to claim 9, characterized in that: A support plate (97) is mounted on the bottom of the rotating plate (92) via a bearing, and the upper surface of the support plate (97) is provided with limiting grooves (98) distributed in a ring array, and the surface of the clamping plate (96) is slidably engaged with the inner wall of the limiting groove (98).

Images