CN218373959U - Underwater anti-scouring structure for cofferdam - Google Patents
Underwater anti-scouring structure for cofferdam Download PDFInfo
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- CN218373959U CN218373959U CN202222879066.5U CN202222879066U CN218373959U CN 218373959 U CN218373959 U CN 218373959U CN 202222879066 U CN202222879066 U CN 202222879066U CN 218373959 U CN218373959 U CN 218373959U
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Abstract
The utility model discloses an underwater anti-scouring structure for cofferdams, which comprises a concrete panel, a plurality of buoys are arranged above the concrete panel at intervals, and each buoy is connected with the concrete panel through a connecting piece; a plurality of connecting pipes are connected between every two adjacent buoys; one end of each floating barrel is connected with an air pipe, the length of each air pipe is greater than the depth of water, the plurality of floating barrels, the connecting pipes and the air pipes are communicated with one another, a plurality of concave parts are arranged on the concrete panel, and the concrete panel is positioned on a riverbed at the periphery of the bottom of the upstream face of the cofferdam; the underwater anti-scouring structure of the utility model can sink rapidly in the calm tide, can ensure the riverbed around the cofferdam to be stable in the tidal range change and the rapid stream, and ensures the normal construction of the bearing platform in the cofferdam when the cofferdam experiences the severe environment; and the utility model discloses avoided traditional riprap safeguard measure, can be to the riverbed guard action around the cofferdam, simultaneously the utility model discloses the scour prevention structure can be retrieved, has reduced construction cost.
Description
Technical Field
The utility model relates to a deep water bridge basis scour protection construction technical field especially relates to an underwater scour protection structure for cofferdam.
Background
When a sea-crossing bridge is built on the coast, a cofferdam is required to be installed firstly to carry out underwater bearing platform construction operation; due to the influence of large tidal range and torrent, scouring pits are formed around the bridge foundation and the bottom of the cofferdam; under the common influence of scouring pits around the bottom of the cofferdam and the rapid stream and the tide level, the cofferdam is difficult to keep stable so as to influence the construction; in the construction process of the underwater bearing platform, an underwater anti-scouring structure is adopted, so that the falling water flow can be effectively prevented from scouring the river bed around the cofferdam, and the stability of the cofferdam is kept; simultaneously, for ensuring convenient construction and reducing engineering cost, the underwater anti-scouring structure can automatically lift in water, and has the characteristics of quick installation and removal and repeated use.
At present, the traditional underwater protection mainly adopts soft raft and riprap protection measures, and the soft raft is laid or the riprap protection layer is used outside the cofferdam in the case of flat tide, so that the construction mode can only play a role of scour prevention at low flow rate and is difficult to recover; in addition, the traditional protection construction lasts for a long time, is easy to be attacked by tide water, and the construction quality is difficult to guarantee; therefore, it is necessary to find an underwater anti-scouring structure for high flow rate and large tidal range.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an underwater scour prevention structure for cofferdam.
In order to realize the above purpose, the utility model adopts the technical proposal that:
the utility model provides an underwater scour prevention structure for cofferdam which characterized in that: the floating type concrete floating structure comprises a concrete panel, wherein a plurality of floating cylinders are arranged above the concrete panel at intervals, and each floating cylinder is connected with the concrete panel through a connecting piece; a plurality of connecting pipes are connected between every two adjacent buoys; one end of the float bowl is connected with an air pipe, the length of the air pipe is greater than the water depth, and each air pipe is communicated with the float bowl connected with the air pipe;
the plurality of buoys, the connecting pipes and the air pipes are communicated with each other;
the concrete panel is provided with a plurality of sunken parts and is positioned on the riverbed at the periphery of the bottom of the upstream face of the cofferdam.
Furthermore, the plurality of buoys are arranged in a shape of a spiral above the concrete panel, and every two adjacent buoys are connected through a connecting pipe.
Furthermore, a plurality of first lifting lugs are arranged on the upper surface of the buoy, and a plurality of second lifting lugs are arranged on the lower surface of each buoy; the first lifting lug and the second lifting lug are both circular rings fixed on the buoy.
Furthermore, a plurality of connecting pieces are pre-embedded on the concrete panel, the connecting pieces are steel wire ropes, and the connecting pieces and the surface of the concrete panel form a closed loop structure; the top end of each connecting piece is connected with a second lifting lug on the lower surface of the buoy through a clamping ring.
Further, the air pipe is communicated with one side, close to the cofferdam, of the floating barrel, and the top end of the air pipe is higher than the water surface.
Further, the sunken part surrounds the periphery of steel-pipe pile, the steel-pipe pile hugs closely the peripheral side of cofferdam, the bottom of steel-pipe pile is fixed on the riverbed.
Furthermore, a plurality of steel pipe pile lifting lugs are arranged on the steel pipe piles, and one steel pipe pile lifting lug at the lowermost end of each steel pipe pile is arranged close to the riverbed surface.
Furthermore, the length of the buoy corresponding to the concave part is shorter than that of the adjacent buoy.
The utility model has the advantages that:
1. the utility model discloses fixed three concrete panel on the outer riverbed of cofferdam upstream face bottom, when tidal range change and torrent, the concrete panel that covers on the outer riverbed of cofferdam bottom can prevent to form around the cofferdam bottom and erode the hole, can keep the stability of cofferdam, and then guarantees the inside cushion cap of cofferdam and normally be under construction.
2. The utility model discloses avoided traditional riprap safeguard measure, the utility model discloses underwater scour prevention structure passes through tracheal water injection for the concrete panel can sink fast, and the engineering time is short; through injecting into the air to the trachea for the concrete panel floats out the surface of water and easily retrieves, and then makes the utility model discloses scour prevention structure can used repeatedly under water, has reduced engineering cost.
Drawings
Fig. 1 is a schematic view of the present invention.
Fig. 2 is a schematic view of the present invention.
Fig. 3 is a schematic diagram of the air pipe arrangement of the present invention.
Fig. 4 is an enlarged partial view of the connection of the concrete deck to the pontoon.
Fig. 5 is a schematic view of the present invention.
Fig. 6 is a schematic diagram of the arrangement of the cofferdam of the present invention.
In the figure: 1-cofferdam; 2-steel pipe pile; 3, a buoy; 4-concrete panels; 5-connecting pipe; 6-a recessed portion; 7-a connector; 8-a first lifting lug; 9-a second lifting lug; 10-a snap ring; 11-the trachea; 12-lifting lugs of the steel pipe pile; 13-positioning a steel wire rope at the side of the cofferdam; 14-positioning the steel wire rope on the concrete panel; 15-rubber pad.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further explained with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the underwater anti-scouring structure for the cofferdam comprises a concrete panel 4, the thickness of the concrete panel 4 is 30cm, a plurality of connecting pieces 7 are pre-embedded on the concrete panel 4, the connecting pieces 7 are steel wire ropes, and as shown in fig. 4, the connecting pieces 7 and the surface of the concrete panel 4 form a closed loop structure.
The plurality of buoys 3 are uniformly arranged above the concrete panel 4 at intervals, and specifically, the plurality of buoys 3 are arranged above the concrete panel 4 in a spiral shape; the inner part of the buoy 3 is of a hollow structure, and the outer surface of the buoy 3 is coated with an anticorrosive layer; every two buoys 3 are transversely connected through a plurality of connecting pipes 5 with smaller diameters, the connecting pipes 5 are steel pipes with hollow interiors, and every two adjacent buoys 3 are communicated through the connecting pipes 5; two first lifting lugs 8 are arranged on the upper surface of each buoy 3 for lifting and mounting; two first lifting lugs 8 on the buoy 3, wherein one first lifting lug 8 is close to the cofferdam 1, and the other first lifting lug is far away from the cofferdam 1; the lower surface of each buoy 3 is provided with four second lifting lugs 9; the first lifting lug 8 and the second lifting lug 9 are both circular rings fixed on the buoy 3.
As shown in fig. 3 and 4, each connecting member 7 is fixedly connected to a second lifting lug 9, specifically, the top end of each connecting member 7 is fixedly connected to a second lifting lug 9 on the lower surface of the pontoon 3 through a snap ring 10, so as to fix the pontoon 3 above the concrete panel.
In practical application, the anti-scouring structure of the utility model is positioned on the riverbed at the periphery of the bottom of the upstream face of the cofferdam 1; as shown in fig. 3, the bottom surface of each pontoon 3 near one side of the cofferdam 1 is connected with an air pipe 11, the air pipe 11 is vertical, the top end is an opening, and the bottom end of the air pipe 11 is communicated with the pontoon 3; the interior of the air pipe is hollow, the length of the air pipe 11 is greater than the depth of water, the top end of the air pipe 11 is flush with the top surface of the cofferdam 1, an opening at the top end of the air pipe 11 is exposed out of the water surface, and the top end of the air pipe 11 is generally about 6m higher than the water surface; the air pipe 11 can be made of a steel pipe, and the bottom end of the air pipe 11 is communicated with the buoy 3 in a welding mode or is in hooping communication through a steel pipe hoop; in order to ensure the stability of the air pipe 11, the upper part of the air pipe 11 and the side surface of the upper part of the cofferdam can be fixed together through bolts.
Each buoy 3 is connected with an air pipe 11, and of the air pipes 11, part of the air pipes 11 are used for water injection, and part of the air pipes 11 are used for air inflation.
One end of the buoy 3 is closed, and the other end of the buoy is communicated with the air pipe 11; the plurality of buoys 3, the connecting pipes 5 and the air pipes 11 are communicated with one another; buoy 3 and connecting pipe 5 are inside hollow structure, and buoy 3 and connecting pipe 5 can adopt the steel that 5mm is thick to make for provide buoyancy to overall structure, make overall structure can float on the surface of water.
As shown in fig. 3, concrete panel 4 is provided with rubber pad 15 on the side that is close to the cofferdam side, and when installing the utility model discloses the in-process of anti-scouring structure, concrete panel 4 hits when the cofferdam case, rubber pad 15 cushion the impact force between concrete panel 4 and the cofferdam case.
As shown in fig. 1 and 3, the concrete panel 4 is provided with a plurality of recesses 6, and one pontoon 3 corresponding to the recess 6 is shorter than the adjacent pontoon 3; as shown in fig. 6, the recess 6 is used for accommodating the steel pipe pile 2; in order to ensure the stability of the cofferdam 1, in actual engineering, the steel pipe pile 2 is arranged on the side face of the cylindrical cofferdam 1 close to the cofferdam 1, the bottom end of the steel pipe pile 2 is driven into a riverbed, and the steel pipe pile 2 is close to the side face of the cofferdam 1 so as to support the cofferdam 1.
A plurality of steel pipe pile lifting lugs 12 are arranged on the steel pipe pile 2, and the steel pipe pile lifting lugs 12 are circular rings fixed on the steel pipe pile 2; the utility model discloses in set up two steel-pipe pile lugs 12 on steel-pipe pile 2, steel-pipe pile lug 12 of lower extreme is close the bed surface of a river as far as possible on steel-pipe pile 2, steel wire rope one end is passed a steel-pipe pile lug 12 of lower extreme on steel-pipe pile 2, the other end passes a first lug 8 that is close to cofferdam 1, a steel-pipe pile lug 12 and a first lug 8 of lower extreme on each steel-pipe pile 2 of wire rope collocation, then fix concrete panel 4 on the bed of a river of 1 upstream face bottom outlying in cofferdam.
As shown in fig. 6, the cofferdam 1 is cylindrical, in actual application, three concrete panels 4 are arranged on the riverbed at the periphery of the bottom of the upstream face of the cofferdam 1, the three concrete panels 4 are integrally arranged in a circular ring shape, a gap may be formed between every two concrete panels 4, and the gap may be filled with broken stones by adopting a stone throwing manner.
The utility model discloses a construction method for underwater scour prevention structure in cofferdam includes following step:
s1, uniformly arranging a plurality of buoys 3 at intervals, connecting two adjacent buoys 3 through a plurality of connecting pipes 5, mounting a plurality of first lifting lugs 8 and second lifting lugs 9 on the buoys 3, and mounting air pipes 11 on the buoys 3;
connecting adjacent buoys 3 through connecting pipes 5 according to the designed size, welding the connecting pipes 5 with the two adjacent buoys 3, and arranging two first lifting lugs 8 on the upper surface of each buoy 3 for lifting and mounting; the lower surface of each buoy 3 is provided with four second lifting lugs 9; the first lifting lug 8 and the second lifting lug 9 are both circular rings fixed on the buoy 3;
an air pipe 11 is arranged on the bottom surface of the buoy 3 close to one side of the cofferdam 1.
S2, prefabricating a concrete panel 4, embedding a connecting piece 7 in the concrete panel 4 in advance, and fixing a plurality of buoys 3 above the concrete panel 4;
the connecting piece 7 is a steel wire rope, and the steel wire rope and the surface of the concrete panel 4 form a closed loop structure; each second lifting lug 9 of the lower surface of the pontoon 3 is fixed with each connecting member 7 by a snap ring 10, so that the plurality of pontoons 3 are fixed above the concrete panel 4.
S3, hoisting the fixed concrete panel 4 and the buoy 3 to the outer side of the cofferdam 1, so that the concrete panel 4 is close to the outer side surface of the cofferdam 1 and the concrete panel 4 floats on the water surface;
the crane is positioned on the ship, the concrete panel 4 and the buoy 3 are integrally hoisted to the outer side of the cofferdam 1 by the crane through the operation on the ship, and the concrete panel 4 floats on the water surface; if the concrete panel 4 is far away from the periphery of the cofferdam 1, the concrete panel 4 can also be dragged to the vicinity of the periphery of the cofferdam 1 by a tug boat, so that the concrete panel 4 is close to the side of the cofferdam 1.
S4, finishing the pre-positioning of the concrete panel 4 in the calm stage;
the pre-positioning of the concrete panel 4 is carried out by tensioning the position-adjusting steel wire rope 14 of the concrete panel through a winch, and the pre-positioning process is completed in the calm stage.
One end of a cofferdam side positioning steel wire rope 13 can be fixed on one first lifting lug 8 close to the cofferdam through a winch, and the other end of the cofferdam side positioning steel wire rope 13 sequentially penetrates through steel pipe pile lifting lugs 12 at the lower end and the upper end of the steel pipe pile 2 through the winch; a plurality of cofferdam side positioning steel wire ropes 13 can be adopted, and each steel wire rope 13 is matched with one first lifting lug 8 and two steel pipe pile lifting lugs 12 close to the cofferdam for use;
one end of a concrete panel positioning steel wire rope 14 is fixed on a first lifting lug 8 far away from the cofferdam 1, the other end of the concrete panel positioning steel wire rope 14 is connected with a winch, the winch stretches the concrete panel positioning steel wire rope 14 to enable the concrete panel 4 to be located at a peripheral appointed position of the cofferdam 1, specifically, each steel pipe pile 2 on the periphery of the cofferdam 1 is located at a concave part 6 on the concrete panel 4, and the concave part 6 and the outer surface of the side surface of the cofferdam 1 are surrounded on the outer side of the steel pipe pile 2.
S5, injecting water into a part of the air pipes 11, sinking the concrete panel 4 to a river bed, and fixing the concrete soft row 4 on the river bed at the periphery of the bottom of the upstream face of the cofferdam 1;
the top end of the air pipe 11 is higher than the horizontal plane, water is injected into the air pipe 11 from an opening at the top end of part of the air pipe 11 through a water suction pump, and the water injected into the air pipe 11 enters the buoys 3 and the connecting pipes 5 because the plurality of buoys 3, the connecting pipes 5 and the air pipe 11 are communicated with one another; after water is injected, the whole concrete panel 4 gradually sinks to a river bed, and in the sinking process of the concrete panel 4, the winch gradually tightens the steel wire rope 13 at the cofferdam side; because one end of the cofferdam side positioning steel wire rope 13 is fixed on one first lifting lug 8 close to the cofferdam, the other end of the cofferdam side positioning steel wire rope 13 penetrates through the steel pipe pile lifting lugs 12 at the lower end and the upper end of the steel pipe pile 2, and the part of the cofferdam side positioning steel wire rope 13 positioned on the two steel pipe pile lifting lugs 12 is linear, the steel pipe rope 13 at the cofferdam side is gradually tightened by the winch in the sinking process of the concrete panel 4, so that the concrete panel 4 can be always maintained near the steel pipe pile 2 in the sinking process.
In the utility model, the steel pipe pile lugs 12 are arranged on the steel pipe pile 12, and the steel pipe pile lugs 12 at the bottom are as close to the river bed surface as possible, so that the concrete panel 4 can be conveniently positioned;
when the concrete panel 4 sinks to the riverbed, the winch completely tightens and fixes the cofferdam side steel wire rope 13 connecting the steel pipe pile lifting lug 12 and the first lifting lug 8, so that the concrete soft mattress is positioned on the riverbed at the periphery of the bottom of the upstream face of the cofferdam 1;
repeat step S4 and S5, can fix a plurality of concrete panels 4 on 1 upstream face bottom outlying riverbed in cofferdam, the utility model discloses in, be fixed three concrete panels 4 on 1 upstream face bottom outlying riverbed in a columniform cofferdam, three concrete panels 4 are ring shape and arrange on 1 upstream face bottom outlying riverbed in cofferdam.
S6, after the underwater bearing platform in the cofferdam is built, loosening the steel wire ropes 13 on the side of the cofferdam for connecting the steel pipe pile lifting lugs 12 and the first lifting lugs 8, inflating the air pipes 11 into which water is not injected, lifting the whole concrete panel 4 after the water in the floating barrels 3 and the connecting pipes 5 overflows, and recovering the concrete panel 4 after the concrete panel 4 floats out of the water surface;
after the underwater bearing platform in the cofferdam is constructed, loosening the steel wire rope 13 at the side of the cofferdam for connecting the steel pipe pile 2 and the first lifting lug 8, and inflating the air pipe 11 by using an inflator pump;
in step S5, only a part of the air tubes 11 is filled with water, and the other part of the air tubes 11 into which water is not filled is used as air inflation in step S6;
11 tops of trachea are higher than the horizontal plane, and the tip opening of trachea 11 that does not inject water is stretched into to the end of aerifing of pump, because of intercommunication each other between many flotation pontoons 3, connecting pipe 5, the trachea 11, and the water that atmospheric pressure made in flotation pontoon 3, the connecting pipe 5 spills over from the top opening of the trachea 11 that originally is used for the water injection, and whole concrete panel 4 rises, treats that concrete panel 4 floats the surface of water after, and the tug is with concrete panel 4 consignment to next construction department so that used repeatedly.
The utility model discloses the work progress should be accomplished at the calm stage.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (8)
1. The utility model provides an underwater scour prevention structure for cofferdam which characterized in that: the floating type floating pontoon structure comprises a concrete panel (4), a plurality of floating pontoons (3) are arranged above the concrete panel (4) at intervals, and each floating pontoon (3) is connected with the concrete panel (4) through a connecting piece (7); a plurality of connecting pipes (5) are connected between every two adjacent buoys (3); one end of the buoy (3) is connected with an air pipe (11), the length of the air pipe (11) is greater than the depth of water, and each air pipe (11) is communicated with the buoy (3) connected with the air pipe;
the plurality of buoys (3), the connecting pipe (5) and the air pipe (11) are communicated with each other;
a plurality of sunken parts (6) are arranged on the concrete panel (4), and the concrete panel (4) is positioned on the riverbed at the periphery of the bottom of the upstream face of the cofferdam (1).
2. An underwater scour prevention structure for a cofferdam as recited in claim 1, wherein: the plurality of buoys (3) are arranged above the concrete panel (4) in a spiral shape, and every two adjacent buoys (3) are communicated through a connecting pipe (5).
3. An underwater scour prevention structure for a cofferdam as claimed in claim 2, wherein: a plurality of first lifting lugs (8) are arranged on the upper surface of each buoy (3), and a plurality of second lifting lugs (9) are arranged on the lower surface of each buoy (3); the first lifting lug (8) and the second lifting lug (9) are both circular rings fixed on the buoy (3).
4. An underwater scour prevention structure for a cofferdam as claimed in claim 1, wherein: a plurality of connecting pieces (7) are pre-embedded on the concrete panel (4), the connecting pieces (7) are steel wire ropes, and the connecting pieces (7) and the surface of the concrete panel (4) form a closed-loop structure; the top end of each connecting piece (7) is connected with a second lifting lug (9) positioned on the lower surface of the buoy (3) through a clamping ring (10).
5. An underwater scour prevention structure for a cofferdam as claimed in claim 1, wherein: the air pipe (11) is communicated with one side of the buoy (3) close to the cofferdam (1), and the top end of the air pipe (11) is higher than the water surface.
6. An underwater scour prevention structure for a cofferdam as recited in claim 1, wherein: the sunken part (6) surrounds the periphery of the steel pipe pile (2), the steel pipe pile (2) is tightly attached to the peripheral side face of the cofferdam (1), and the bottom end of the steel pipe pile (2) is fixed on a riverbed.
7. An underwater scour prevention structure for a cofferdam as recited in claim 1, wherein: the steel pipe pile (2) is provided with a plurality of steel pipe pile lifting lugs (12), and one steel pipe pile lifting lug (12) at the lowest end of the steel pipe pile (2) is arranged close to the riverbed surface.
8. An underwater scour prevention structure for a cofferdam as recited in claim 1, wherein: the length of the buoy (3) corresponding to the concave part (6) is shorter than that of the adjacent buoy (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222879066.5U CN218373959U (en) | 2022-10-31 | 2022-10-31 | Underwater anti-scouring structure for cofferdam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222879066.5U CN218373959U (en) | 2022-10-31 | 2022-10-31 | Underwater anti-scouring structure for cofferdam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218373959U true CN218373959U (en) | 2023-01-24 |
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ID=84935817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222879066.5U Active CN218373959U (en) | 2022-10-31 | 2022-10-31 | Underwater anti-scouring structure for cofferdam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218373959U (en) |
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2022
- 2022-10-31 CN CN202222879066.5U patent/CN218373959U/en active Active
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