Bridge pier underwater temporary steel cofferdam protection device and construction method thereof

Abstract

The application relates to the technical field of building construction, and provides a bridge pier underwater temporary steel cofferdam protection device and a construction method thereof, which comprises the following: a plurality of protection barrels which are sunk to the water bottom and distributed at the periphery of an underwater steel cofferdam; each protection barrel comprises a core column with a cavity in the interior and a plug movably arranged in the cavity of the core column, the top end of the core column is provided with a feeding hole for injecting sandstone filling into the cavity of the core column, and the bottom end of the core column is provided with a discharging hole; a floating ring which floats on the water surface; and a plurality of traction ropes, one end of each of which is connected with the floating ring and the other end of each of which is connected with the corresponding protection barrel, each traction rope passes through the top end of the core column of the protection barrel and is connected with the plug of the protection barrel. The protection barrel and the traction rope can be recycled and reused, and the use cost is reduced. The floating ring not only can fix the traction rope on the water surface, facilitating the recycling of the protection barrel, but also can mark and position the protection barrel on the water surface.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to an underwater temporary steel cofferdam protection device for bridge piers and its construction method. Background Technology

[0002] During bridge construction, some bridge piers are located in rivers and lakes, and some waters have rapid currents. When constructing structures in high-velocity waters, the original flow field will be altered, leading to scouring of the riverbed. In silty sand and fine sand riverbeds, the sand particles are relatively light and lack cohesion, making them easily washed away by the river. This results in the erosion of the strata in front of and behind the structures. The scouring depth also increases with the width of the water-blocking surface of the structures, and may even reach depths of more than ten or tens of meters.

[0003] In deep-water bridge foundation construction, cofferdams are typically used as drilling platforms. The steel cofferdam is manufactured as a single unit, launched using an airbag method, and then floated to the pier location. After the bored pile construction is completed, the steel cofferdam is precisely sunk using a lifting system and a horizontal guiding device, thus providing a dry working environment for the pier cap pouring. However, temporary steel cofferdams are relatively large and subject to significant scouring. In practice, methods such as placing large-diameter crushed stone, sandbags, gabions, or membrane-filled concrete in front of and behind the steel cofferdam are commonly used. However, the materials discarded using these methods cannot be recycled or reused, resulting in significant material waste. Summary of the Invention

[0004] To address the problems in the prior art, this application proposes a temporary underwater steel cofferdam protection device for bridge piers and its construction method, which solves the problem that existing steel cofferdam protection materials for bridge piers cannot be recycled.

[0005] In a first aspect, the present invention proposes a temporary underwater steel cofferdam protection device for bridge piers, comprising:

[0006] Multiple protective barrels are submerged to the bottom of the water and distributed around the perimeter of the underwater steel cofferdam. Each protective barrel includes a core column with an internal cavity and a plug that is movably disposed within the cavity of the core column. The top of the core column is provided with a feed hole for injecting sand and gravel filler into the cavity of the core column, and the bottom of the core column is provided with a discharge hole for discharging sand and gravel filler. The plug is used to seal or open the discharge hole.

[0007] Floating rings, which float on the water surface and are located around the bridge piers; and

[0008] Multiple traction ropes, one end of which is connected to the floating ring, and the other end of which is connected to multiple protective barrels one by one. Each traction rope passes through the top of the core column of the protective barrel and is connected to the plug of the protective barrel.

[0009] Furthermore, the plug has a frustum structure, with its top area being smaller than its bottom area. The bottom area of ​​the plug is larger than the diameter of the discharge hole, and the bottom area of ​​the plug is smaller than the diameter of the cavity of the core column. The bottom of the plug is also provided with a pointed cone, the bottom of which is a spike. The pointed cone extends through the discharge hole to the bottom of the core column.

[0010] By incorporating a pointed cone at the bottom of the plug, the cone embeds itself into the riverbed when the protective barrel sinks to the bottom, preventing displacement and improving protection. Furthermore, the cone creates a conical hole in the riverbed, and the pressure from the cone compresses the sand and gravel around the hole, making it compact and stable. When the protective barrel is retrieved, the sand and gravel inside falls into the conical hole, filling any gaps in the riverbed and stabilizing the riverbed.

[0011] Furthermore, a buffer element is provided at the top of the plug, the buffer element including a spring and a shock absorber, one end of the spring being connected to the top of the plug, and the other end of the spring being connected to the shock absorber.

[0012] The buffer component helps to prevent excessive impact force from the plug hitting the core column when the traction rope pulls the plug upward, thus avoiding deformation or damage to the core column and extending its service life.

[0013] Furthermore, the shock absorber is provided with a through hole, the traction rope passes through the through hole on the shock absorber and is connected to the plug, and there are multiple springs, which are evenly distributed around the through hole of the shock absorber.

[0014] By passing the traction rope through the through-hole on the shock absorber and distributing the springs around it, the contact area between the shock absorber and the core column is larger when the plug is pulled upward, resulting in better shock absorption and limiting the displacement and tilting of the plug during the impact, thus preventing the plug from damaging the inner wall of the core column.

[0015] Furthermore, a stud is provided at one end of the traction rope that connects to the plug, and a threaded hole is provided at the top of the plug that is threaded to engage with the stud.

[0016] The traction rope and the plug are detachably connected through studs and threaded holes, making it easier to assemble and disassemble the traction rope and the protective barrel.

[0017] Furthermore, the protective barrel also includes an airbag sleeve surrounding the core column, and the airbag sleeve is provided with an air nozzle for inflation and deflation.

[0018] By installing an airbag sleeve on the outside of the protective barrel, the airbag sleeve expands and contracts through the inflation and deflation of the air nozzle, achieving flexible contact between adjacent protective barrels, resulting in a larger contact area and less susceptibility to damage.

[0019] Furthermore, a barometer is connected to the airbag sleeve.

[0020] By monitoring the air pressure inside the airbag sleeve with a barometer and inflating and deflating the air nozzle, the air pressure of the airbag sleeve can be adjusted, thereby adjusting the floating height of the protective barrel underwater. This allows the protective barrel to float in areas above the riverbed and below the water surface, thus providing protection for the steel cofferdam near the water surface and for the bridge piers at full height below the water surface.

[0021] Furthermore, there are multiple feed holes, which are evenly distributed along the circumference of the core column; a spiral guide vane is provided below each feed hole in the cavity of the core column to generate swirling flow in the cavity.

[0022] By installing guide vanes below the feed inlet, water flows into the core column through the feed inlet during the recovery of the protective tank. The guide vanes create a swirling flow that washes over the inner wall of the core column and facilitates the rapid passage of sand and gravel filler through the discharge outlet, improving the unloading efficiency of the sand and gravel filler. Furthermore, the washing over the inner wall of the core column ensures the cleanliness of its internal cavity.

[0023] Furthermore, the floating ring includes multiple fan-shaped floats, which are connected end to end in the circumferential direction to form a circular floating ring surrounding the bridge pier; each fan-shaped float is connected to at least one traction rope.

[0024] The sector-shaped buoys are used to locate and mark the deployment position or target position of the underwater protective barrel, ensuring the protective effect. Adjacent sector-shaped buoys are hinged together by connecting plates. That is, although the connecting plates connect adjacent sector-shaped buoys, they can still rotate relative to each other at a certain angle; thus, by measuring the relative displacement of adjacent sector-shaped buoys, it is possible to determine whether there is any displacement of the protective barrel corresponding to the sector-shaped buoy, so as to adjust the position of the protective barrel in a timely manner.

[0025] Furthermore, the multiple protective barrels are distributed in groups, with each group including at least three protective barrels. The three traction ropes connected to the three protective barrels in the same group are connected to a cable organizer and are connected to the same fan-shaped float.

[0026] Secondly, the present invention also proposes a construction method for the above-mentioned underwater temporary steel cofferdam protection device for bridge piers, comprising the following steps:

[0027] Float the buoys on the water surface and distribute them around the bridge piers;

[0028] Assemble and connect the protective barrels and towing ropes on the shore or boat, so that each towing rope is connected to the plug of a protective barrel. Place the plug at the bottom of the core column and seal the discharge hole of the core column. Fill the core column with sand and gravel filler through the feed hole, so that the sand and gravel filler is at least piled up on the top and around the plug.

[0029] The protective barrel is pulled by a towing rope and lowered to a target position outside the underwater steel cofferdam.

[0030] Repeat the above steps to ensure that the protective barrels are distributed at all target locations around the underwater steel cofferdam;

[0031] If it is necessary to retrieve a protective barrel at a specific location, a winch is used to wind up the traction rope connected to the protective barrel at that location. This causes the plug inside the protective barrel to open the discharge hole. Under the action of gravity and the water flow entering from the feed hole, the sand and gravel filler inside the protective barrel leaves the core column from the discharge hole and falls to the bottom of the water. The traction rope is gradually wound up until the protective barrel connected to the traction rope floats to the surface of the water, thus completing the retrieval of the protective barrel at the target location.

[0032] The beneficial effects of this invention are as follows: A protective barrel is lowered to the bottom of the water using a traction rope. This barrel protects the underwater steel cofferdam, preventing the erosion of riverbed sand and gravel near the cofferdam and thus avoiding structural damage caused by erosion of the strata. Because the traction rope connects to a plug inside the protective barrel, the sand and gravel filler enters the cavity of the core column through the feed hole and compacts the plug, sealing the discharge hole. During the descent of the protective barrel, the sand and gravel filler will not overflow, ensuring effective descent. When it is necessary to retrieve the protective barrel, simply pull the traction rope upwards to raise the plug within the core column, opening the discharge hole and allowing the sand and gravel filler to be discharged. Since the feed hole of the core column remains open, water flows into the core column through the feed hole during the barrel's ascent, further flushing out the sand and gravel filler, quickly reducing the barrel's weight and achieving efficient recovery. The sand and gravel filler inside the protective barrel is usually sourced locally and will not impact the surrounding environment. The sand and gravel discharged from the protective barrels fall onto the riverbed, especially around the bridge piers, which can also protect the underwater strata of the piers. The recovered protective barrels and tow ropes can be reused, reducing operating costs. The floating rings not only secure the tow ropes to the water surface for easy retrieval of the protective barrels, but also allow for marking and positioning of the barrels on the water surface. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the underwater temporary steel cofferdam protection device for bridge piers according to the present invention.

[0034] Figure 2 for Figure 1 A schematic diagram of the underwater temporary steel cofferdam protection device for bridge piers installed underwater.

[0035] Figure 3 for Figure 1 A schematic diagram of a group of protective barrels connected to the same sector-shaped float.

[0036] Figure 4 for Figure 3 An enlarged structural diagram.

[0037] Figure 5 for Figure 3 A cross-sectional view of a protective barrel.

[0038] Figure 6 for Figure 5 A schematic diagram of the structure for unloading sand and gravel filler by opening the discharge hole of the middle plug.

[0039] Figure 7 for Figure 6 A three-dimensional structural diagram of the middle plug.

[0040] Figure 8 for Figure 7 An enlarged schematic diagram of the buffer component at the top of the middle plug.

[0041] In the diagram, 1-bridge pier; 2-floating ring; 21-fan-shaped float; 3-steel cofferdam; 4-protective barrel; 41-core column; 411-feed hole; 412-discharge hole; 413-guide vane; 42-airbag sleeve; 421-air nozzle; 43-plug; 44-cone; 45-spring; 46-shock absorber; 47-stud; 48-threaded hole; 5-traction rope; 6-line organizer; 7-connecting piece; 8-limiting ball; 9-sand and gravel filler. Detailed Implementation

[0042] The following is in conjunction with the appendix Figures 1 to 8 The present invention will be further described in detail with reference to specific embodiments.

[0043] like Figures 1 to 8 The underwater temporary steel cofferdam protection device for the bridge pier shown includes floating rings 2, multiple protective barrels 4, and multiple traction ropes 5.

[0044] like Figure 1 , 2 As shown, multiple protective barrels 4 are submerged to the bottom of the water and distributed around the underwater steel cofferdam 3. Each protective barrel 4 includes a core column 41 with an internal cavity and a plug 43 movably disposed within the cavity of the core column 41. The top of the core column 41 is provided with an inlet hole 411 for injecting sand and gravel filler 9 into the cavity of the core column 41, and the bottom of the core column 41 is provided with an outlet hole 412 for discharging the sand and gravel filler 9. The plug 43 is used to seal or open the outlet hole 412. For a clear understanding of the structure, Figure 1 , 2 A traction rope 5 was hidden inside.

[0045] The floating ring 2 floats on the water surface and is located around the bridge pier 1.

[0046] Multiple traction ropes 5, one end of which is connected to the floating ring 2, and the other end is connected to multiple protective barrels 4 in a corresponding manner. Each traction rope 5 passes through the top of the core column 41 of the protective barrel 4 and is connected to the plug 43 of the protective barrel 4.

[0047] The floating ring 2 includes multiple fan-shaped floats 21, which are connected end to end along the circumference to form a circular ring 2 that surrounds the bridge pier 1; each fan-shaped float 21 is connected to at least one towing rope 5. The fan-shaped floats 21 enable the positioning and marking of the underwater protective barrel 4 at its deployment location or target location, ensuring the protective effect.

[0048] Adjacent sector floats 21 are hinged by connecting pieces 7. That is, although the connecting pieces 7 connect adjacent sector floats 21, the adjacent sector floats 21 can still rotate relative to each other by a certain angle; thus, by measuring the relative displacement of adjacent sector floats 21, it is possible to determine whether the protective barrel 4 corresponding to the sector float 21 has been displaced, so as to adjust the position of the protective barrel 4 in a timely manner.

[0049] Multiple protective barrels 4 are distributed in groups, each group includes at least three protective barrels 4, and the three protective barrels 4 in the same group are connected to three traction ropes 5 connected to a cable organizer 6, and connected to the same fan-shaped float 21.

[0050] like Figure 3 As shown, three protective buckets 4 form a group. Three traction ropes 5, each connected to one of the three protective buckets 4, are connected to a cable organizer 6 and then to the same fan-shaped float 21. The cable organizer 6 includes a cable organizer plate with at least three through holes for the three traction ropes 5 to pass through. Each fan-shaped float 21 also has at least three through holes. After passing through the three through holes of the cable organizer 6, the three traction ropes 5 pass through the three through holes of the fan-shaped float 21, and after exiting to the top of the fan-shaped float 21, they are connected to a limiting ball 8. The diameter of the limiting ball 8 is larger than the diameter of the through holes on the fan-shaped float 21. Under the action of the limiting ball 8, the traction ropes 5 will not fall off the fan-shaped float 21. Several rods can also be fixedly installed on the fan-shaped float 21 to allow the traction ropes 5 to wrap around the rods. Of course, a winch can also be installed on the fan-shaped float 21, and the traction rope 5 is wound around the winch. Under the action of the winch, the traction rope 5 is wound up or lowered. When the traction rope 5 is wound up, the protective barrel 4 is lifted, and when the traction rope 5 is lowered, the protective barrel 4 sinks. The fan-shaped float 21 can be a floating platform assembled from hollow plastic boxes.

[0051] When multiple protective barrels 4 form a group, the length or number of traction ropes 5 can be reduced. For example, when three protective barrels 4 form a group, the traction ropes 5 of the three protective barrels 4 pass through the cable organizer 6 and are connected to another rope. This rope is then connected to the fan-shaped float 21 or to the winch on the fan-shaped float 21, thereby reducing the three traction ropes 5 between the cable organizer 6 and the fan-shaped float 21 to one rope, simplifying the structure. Of course, under the action of this single rope, the protective barrels 4 in the same group sink or rise synchronously.

[0052] like Figure 3 , 4 As shown, the protective barrel 4 also includes an airbag sleeve 42 surrounding the core column 41, and the airbag sleeve 42 is provided with an air nozzle 421 for inflation and deflation. By providing the airbag sleeve 42 on the outside of the protective barrel 4, the inflation and deflation of the airbag sleeve 42 through the air nozzle 421 realizes the expansion and contraction of the airbag sleeve 42, achieving flexible contact between adjacent protective barrels 4, with a larger contact surface and less susceptibility to damage.

[0053] A barometer is connected to the airbag sleeve 42. The barometer monitors the air pressure inside the airbag sleeve 42, and in conjunction with the inflation and deflation of the air nozzle 421, the air pressure of the airbag sleeve 42 is adjusted, thereby adjusting the floating height of the protective barrel 4 underwater. This allows the protective barrel 4 to float in areas above the riverbed and below the water surface, thus providing protection for the steel cofferdam 3 near the water surface and for the bridge pier 1 at all heights below the water surface.

[0054] like Figure 4 , 5 As shown, there are multiple feed holes 411, which are evenly distributed along the circumference of the core column 41. In this embodiment, there are six feed holes 411. A spiral guide vane 413 is provided below each feed hole 411 in the cavity of the core column 41 to generate swirling flow of water entering the cavity.

[0055] By installing guide vanes 413 below the feed hole 411, water flows into the core column 41 through the feed hole 411 during the recovery of the protective tank 4. Under the action of the guide vanes 413, a swirling flow is formed, which washes the inner wall of the core column 41 and promotes the rapid passage of the sand and gravel packing 9 inside the core column 41 through the discharge hole 412, thereby improving the unloading efficiency of the sand and gravel packing 9. In addition, the washing of the inner wall of the core column 41 also ensures the cleanliness of the inner cavity of the core column 41.

[0056] like Figure 5-8As shown, the plug 43 has a frustum-shaped structure, with its top area smaller than its bottom area. The bottom area of ​​the plug 43 is larger than the diameter of the discharge hole 412, and smaller than the diameter of the cavity of the core column 41. That is, the maximum diameter of the plug 43 is smaller than the inner diameter of the cavity of the core column 41. There is a lateral gap between the plug 43 and the inner wall of the core column 41 to facilitate the passage of sand and gravel filler 9. The bottom end of the plug 43 is also provided with a pointed cone 44, the bottom end of which is a spike. The pointed cone 44 extends through the discharge hole 412 and out of the bottom end of the core column 41. The maximum diameter of the pointed cone 44 is smaller than the bottom diameter of the plug 43, thus forming an annular limiting part at the bottom end of the plug 43. This annular limiting part is always inside the core column 41, preventing the plug 43 from falling out of the core column 41. To facilitate the installation of the plug 43 inside the core post 41, the core post 41 can be made of two semi-cylindrical structures joined together, with the joint surface glued or connected by screws.

[0057] By providing a pointed cone 44 at the bottom of the plug 43, when the protective barrel 4 sinks to the bottom of the water, the pointed cone 44 can penetrate into the riverbed, making the protective barrel 4 less prone to displacement and improving the protective effect. In addition, after the pointed cone 44 penetrates into the riverbed, it forms a pointed cone hole in the riverbed. Under the compression of the pointed cone 44, the sand and gravel around the pointed cone hole in the riverbed are made compacted and stable. After the protective barrel 4 is retrieved, the sand and gravel filler 9 inside the protective barrel 4 falls into the pointed cone hole, filling the loss of sand and gravel from the riverbed at the pointed cone hole and stabilizing the riverbed.

[0058] A buffer is provided at the top of the plug 43, which includes a spring 45 and a shock absorber 46. One end of the spring 45 is connected to the top of the plug 43, and the other end of the spring 45 is connected to the shock absorber 46. The buffer prevents the plug 43 from impacting the core column 41 with excessive force when the traction rope 5 pulls the plug 43 upward, thus avoiding deformation or damage to the core column 41 and extending its service life.

[0059] The shock absorber 46 has through holes, through which the traction rope 5 passes and connects to the plug 43. Multiple springs 45 are evenly distributed around the through holes of the shock absorber 46. By passing the traction rope 5 through the through holes of the shock absorber 46 and distributing the springs 45 around them, when the plug 43 is pulled upwards, the contact area between the shock absorber 46 and the core column 41 is larger, resulting in better shock absorption. This also limits the displacement and tilting of the plug 43 during impact, preventing the plug 43 from damaging the inner wall of the core column 41.

[0060] A stud 47 is provided at one end of the traction rope 5 that connects to the plug 43, and a threaded hole 48 is provided at the top of the plug 43 that engages with the stud 47. The traction rope 5 and the plug 43 are detachably connected through the stud 47 and the threaded hole 48, making it easier to assemble and disassemble the traction rope 5 and the protective bucket 4.

[0061] Based on the same inventive concept, this invention also proposes a construction method for the above-mentioned underwater temporary steel cofferdam 3 protective device for bridge pier 1, comprising the following steps:

[0062] The floating ring 2 is floated on the water surface and distributed around the bridge pier 1. In this embodiment, the floating ring 2 includes multiple fan-shaped floats 21, which are connected end to end along the circumference of the bridge pier 1 to form a circular floating ring 2 surrounding the bridge pier 1.

[0063] Assemble and connect the protective barrel 4 and the towing rope 5 on the shore or boat, so that each towing rope 5 is connected to the plug 43 of the protective barrel 4. In this embodiment, the towing rope 5 is made of steel wire rope. The stud 47 at one end of the towing rope 5 is set in advance. The diameter of the stud 47 is less than or equal to the diameter of the through hole on the shock absorber 46, and the diameter of the stud 47 is also less than or equal to the diameter of the through hole at the top of the core column 41 through which the towing rope 5 passes. In order to connect the towing rope 5 and the plug 43, the core column 41 is inverted so that the shock absorber 46 of the plug 43 abuts against the core column 41. Shake the plug 43 to align the through hole of the shock absorber 46 with the through hole of the core column 41. Of course, in this embodiment... For example, the diameter of the feed hole 411 at the top of the core column 41 is greater than 10cm. An arm can be inserted through the feed hole 411 into the core column 41 to adjust the position of the plug 43 and the damping plate 46, aligning the through hole of the damping plate 46 with the through hole of the core column 41. Then, the end of the traction rope 5 connected to the stud 47 is passed through the through holes of the core column 41 and the damping plate 46, and threaded into the threaded hole 48 of the plug 43, thus connecting the traction rope 5 to the plug 43. The core column 41 is then flipped back to its upright position. Under gravity, the plug 43 sinks to the bottom of the core column 41, sealing the discharge hole 412 of the core column 41. The sand and gravel filler 9 is then filled into the core column 41 through the feed hole 411, ensuring that the sand and gravel filler 9 accumulates at least at the top and around the plug 43; the plug 43 is compressed by the sand and gravel filler 9. The sand and gravel filler 9 can be sourced locally, such as sand and gravel from the riverbed away from the bridge pier 1, or sand and gravel from the riverbank. In this embodiment, the core column 41 can be made of plastic. The airbag sleeve 42 is fitted over the core column 41. This step can be done before filling the sand and gravel filler 9, or before connecting the traction rope 5 and the plug 43. Before sinking the protective barrel 4 to the bottom of the water, the sinking depth is determined by referring to the construction drawings to control the inflation amount of the airbag sleeve 42. Of course, the sinking depth of the protective barrel 4 needs to consider not only the buoyancy of the protective barrel 4 brought by the inflation amount, but also the filling weight of the sand and gravel filler 9.

[0064] Deploying or lowering the protective barrel 4: Using the traction rope 5, the protective barrel 4 is lowered to a target position on the outer perimeter of the underwater steel cofferdam 3. The target position is predetermined. Since the dimensions of the underwater steel cofferdam 3 and its lowering position were determined during construction, and the dimensions of the bridge pier 1 are known, the lowering position of the protective barrel 4 and the position of the floating ring 2 on the water surface can be calculated based on this known data. The underwater position of the protective barrel 4 corresponds to the position of the floating ring 2 on the water surface. The underwater positions of all the protective barrels 4 are broken down to obtain the target position for each protective barrel 4. If necessary, the protective barrels 4 and the fan-shaped floats 21 can be numbered to ensure accurate lowering.

[0065] Repeat the above steps of sinking or deploying the protective barrels 4 to ensure that all target locations around the underwater steel cofferdam 3 are covered with protective barrels 4. The deployment position of the protective barrels 4 can be verified by the fan-shaped float 21. If the deployment is incorrect, the fan-shaped float 21 will shift horizontally in calm and windless conditions, provided that the towing rope 5 remains taut.

[0066] If it is necessary to retrieve the protective barrel 4 at a certain target location, a winch is used to wind up the traction rope 5 connected to the protective barrel 4 at that target location. The traction rope 5 pulls up the plug 43, causing the plug 43 inside the protective barrel 4 to open the discharge hole 412. Under the action of gravity and the water flow entering from the feed hole 411, the sand and gravel filler 9 inside the protective barrel 4 leaves the core column 41 from the discharge hole 412 and falls to the bottom of the water. The traction rope 5 is gradually retracted until the protective barrel 4 connected to the traction rope 5 floats to the surface of the water, thus completing the retrieval of the protective barrel 4 at the target location for reuse.

[0067] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A bridge pier underwater temporary steel cofferdam protection device, characterized in that, The application relates to a bridge pier protection device. The device comprises: a plurality of protection barrels which are sunk to the bottom of water and distributed around the outer periphery of an underwater steel cofferdam; each protection barrel comprises a core column with a cavity and a plug movably arranged in the cavity of the core column, the top end of the core column is provided with a feeding hole for injecting sand and stone filling into the cavity of the core column, the bottom end of the core column is provided with a discharging hole for discharging the sand and stone filling, and the plug is used for plugging or opening the discharging hole; a floating ring which is floated on the water surface and located around the bridge pier; and 2. The underwater temporary steel cofferdam protection device for bridge pier column according to claim 1, characterized in that, a plurality of traction ropes, one end of each of which is connected with the floating ring and the other end of each of which is connected with the plugs of the protection barrels one by one, each traction rope passes through the top end of the core column of the protection barrel and is connected with the plug of the protection barrel.

3. The underwater temporary steel cofferdam protection device for bridge pier column according to claim 1, characterized in that, The plug is in a conical frustum structure, the area of the top end of the plug is smaller than the area of the bottom end of the plug, the area of the bottom end of the plug is larger than the diameter of the discharging hole, the area of the bottom end of the plug is smaller than the diameter of the cavity of the core column, the bottom end of the plug is further provided with a pointed part, the bottom end of the pointed part is a pointed end, and the pointed part extends out of the bottom end of the core column through the discharging hole.

4. The bridge pier underwater temporary steel cofferdam protection device according to claim 3, characterized in that, The top end of the plug is provided with a buffer piece, the buffer piece comprises a spring and a shock-absorbing sheet, one end of the spring is connected with the top end of the plug, and the other end of the spring is connected with the shock-absorbing sheet.

5. The bridge pier underwater temporary steel cofferdam protection device according to claim 4, characterized in that, The shock-absorbing sheet is provided with a through hole, the traction rope passes through the through hole of the shock-absorbing sheet and is connected with the plug, and the spring is provided in plurality and is uniformly distributed around the through hole of the shock-absorbing sheet.

6. The bridge pier underwater temporary steel cofferdam protection device according to claim 1, characterized in that, The end of the traction rope connected with the plug is provided with a threaded stud, and the top end of the plug is provided with a threaded hole matched with the threaded stud.

7. The underwater temporary steel cofferdam protection device for bridge pier column according to any one of claims 1-6, characterized in that, The protection barrel further comprises an air bag sleeve surrounding the core column, and the air bag sleeve is provided with an air nozzle for air charging and discharging.

8. The bridge pier underwater temporary steel cofferdam protection device according to claim 7, characterized in that, The feeding hole is provided in plurality and is uniformly distributed along the circumference of the core column; a spiral guide vane is arranged in the cavity of the core column below each feeding hole for generating a rotational flow in the cavity.

9. The bridge pier underwater temporary steel cofferdam protection device according to claim 8, characterized in that, The floating ring comprises a plurality of fan-shaped floating blocks which are connected in a circular ring shape around the bridge pier and are connected in a circular ring shape around the bridge pier.

10. The construction method of the bridge pier underwater temporary steel cofferdam protection device according to claim 1, characterized in that, The plurality of protection barrels are distributed in groups, each group comprises at least three protection barrels, three traction ropes connected with the three protection barrels in the same group are connected with a line adjuster, and the three traction ropes are connected with the same fan-shaped floating block. The application further relates to a bridge pier protection method. The floating ring is floated on the water surface and is distributed around the bridge pier. The protection barrels and the traction ropes are assembled and connected on the bank or on a ship, each traction rope is connected with the plug of one protection barrel, the plug is arranged at the bottom end of the core column, the discharging hole of the core column is plugged, the sand and stone filling is filled into the core column through the feeding hole, and the sand and stone filling is stacked at least on the top end and around the plug. The protection barrels are sunk to a target position on the outer periphery of the underwater steel cofferdam by the traction ropes. The above steps are repeated to distribute the protection barrels on all target positions on the outer periphery of the underwater steel cofferdam. If it is necessary to recover a protection barrel at a target position, a winch is used to wind up a traction rope connected with the protection barrel at the target position, so that a plug in the protection barrel opens a discharge hole, sand and stone fillings in the protection barrel are discharged from the discharge hole to the bottom of the water under the action of gravity and water flow from the feeding hole, the traction rope is gradually recovered until the protection barrel connected with the traction rope floats to the water surface, and recovery of the protection barrel at the target position is completed.

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