Construction method for excavating and leveling underwater foundation trench and installing anchor beam and hanging net in offshore area

Abstract

The invention discloses an offshore area underwater foundation trench excavation leveling and anchor beam installation hanging net construction method, and relates to the technical field of hanging net blocking construction.The offshore area underwater foundation trench excavation leveling and anchor beam installation hanging net construction method comprises a permanent trestle arranged on a river channel, a fixing assembly is arranged on a pier of the permanent trestle, and the fixing assembly is connected with a hanging net; a foundation trench is formed in a riverbed at the bottom of a pier of the permanent trestle, an anchor beam is arranged in the foundation trench and connected with the side, away from the fixing assembly, of the hanging net, a temporary trestle is arranged on one side of the permanent trestle, a portal is arranged on the permanent trestle and the temporary trestle, and the anchor beam is hung in the foundation trench through the portal. A foundation trench is formed in the bottom of a pier of a permanent trestle, an anchor beam is hoisted and placed in the foundation trench through a portal frame to complete installation of the anchor beam, the anchor beam is connected with a hanging net to fix the hanging net, and the upper portion of the hanging net is fixed through a fixing assembly arranged on the pier of the permanent trestle. And the possibility that the hanging net moves to generate gaps under the influence of water flow is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of net installation, and in particular to a method for constructing a net for underwater foundation trench excavation and leveling and anchor beam installation in offshore areas. Background Art

[0002] The operation of the nuclear power plant requires a large amount of water. A large water diversion channel is opened around the nuclear power plant to supply water to the nuclear power plant. However, since there are a large number of aquatic organisms in the water introduced into the nuclear power plant, it will have an impact on the nuclear power plant. It is necessary to set up hanging nets at the pier position of the drinking water river to intercept the aquatic organisms.

[0003] Since the hanging nets are set in the river channel, every time water is diverted and discharged, the nets will move with the flow of water, creating some gaps, which can easily allow aquatic organisms to enter the nuclear power plant area and cause impacts.

[0004] With respect to the above-mentioned related technologies, the inventors believe that each time water is diverted and drained, the hanging net will move with the flow of water, resulting in partial gaps, which may easily allow aquatic organisms to enter the nuclear power plant area and cause impacts. Summary of the invention

[0005] The purpose of this application is to provide a construction method for underwater foundation trench excavation and leveling and anchor beam installation and net hanging in offshore areas, so as to improve the problem that the net will move with the flow of water every time water is diverted and discharged, resulting in partial gaps, which can easily allow aquatic organisms to enter the nuclear power plant area and cause impacts.

[0006] The present application provides an offshore underwater foundation trench and anchor beam installation net hanging structure, which adopts the following technical solutions: An underwater foundation trench and anchor beam installation and net hanging structure in offshore areas, including a permanent trestle arranged on a river channel, a fixing assembly arranged on the piers of the permanent trestle, the fixing assembly being connected to a net hanging, a foundation trench being opened on the riverbed at the bottom of the piers of the permanent trestle, an anchor beam being arranged in the foundation trench, the anchor beam being connected to a side of the net hanging away from the fixing assembly, a temporary trestle being arranged on one side of the permanent trestle, a portal frame being arranged on the permanent trestle and the temporary trestle, the portal frame suspending the anchor beam in the foundation trench.

[0007] By adopting the above technical scheme, a foundation trench is opened on one side of the pier of the permanent trestle, the position of the anchor beam is fixed by the foundation trench, one side of the hanging net is connected and fixed by a fixing assembly arranged on the pier of the permanent trestle, the anchor beam is connected and fixed to the other side of the hanging net away from the fixing assembly, the possibility of the hanging net moving under the influence of the water flow is reduced, and the anchor beam blocks the distance between the bottom of the hanging net and the bottom of the river channel; the anchor beam is hoisted by the gantry arranged on the trestle, so the efficiency of the installation and construction of the trestle hanging net is improved.

[0008] Optionally, the foundation trench is arranged along the length direction of the permanent trestle, inclined grooves are opened on both side walls of the foundation trench, the bottom side walls of the foundation trench are arranged flat, the anchor beams are arranged in the foundation trench along the length direction of the foundation trench and abut against the side walls of the foundation trench, the side walls between adjacent anchor beams are fitted together, and the side of the anchor beam away from the foundation trench is connected to the hanging net.

[0009] By adopting the above technical scheme, the foundation trench is opened along the length direction of the permanent trestle, so that the fixed anchor beam in the foundation trench is horizontally set at the bottom of the river channel, so that the hanging net blocks the river channel; inclined grooves are opened on both sides of the foundation trench, so that the anchor beam can better fall into the foundation trench through the inclined grooves, and the bottom of the foundation trench is flattened to make the bottom of the anchor beam fit with the side wall of the bottom of the foundation trench, thereby reducing the gap between the bottom of the anchor beam and the foundation trench, and the end side walls of adjacent anchor beams are pressed against each other, thereby reducing the gap between adjacent anchor beams and reducing the possibility of aquatic organisms bypassing the hanging net through the gap.

[0010] Optionally, a protrusion is extended from the side of the anchor beam away from the base trench, the top of the protrusion corresponds to the fixing assembly, the ends of the protrusions on adjacent anchor beams fit together, and a fixing ring is provided on the side of the protrusion away from the anchor beam. The fixing ring is connected to one side of the hanging net, so that the hanging net is set in the river channel along the length direction of the base trench.

[0011] By adopting the above technical solution, a protrusion is extended on the side of the anchor beam away from the base groove, and the side walls of the protrusion ends of adjacent anchor beams abut against each other, thereby reducing the gap between the anchor beams and preventing aquatic organisms from passing through; by connecting a fixing ring provided on the protrusion with the side of the hanging net close to the anchor beam, the bottom of the hanging net is fixed, thereby reducing the possibility of the hanging net moving with the flow of water and improving the stability of the hanging net.

[0012] Optionally, the fixing assembly includes a fixing clamp, which is arranged on the outer side wall of the pier of the fixed trestle, and the fixing clamp is provided with a fixing ring 2 on the side wall close to the anchor beam, and the fixing ring 2 is provided with a connecting rope between adjacent piers in the length direction of the permanent trestle, and the connecting rope is connected to the side of the hanging net away from the anchor beam, so that the hanging net is set along the length direction of the permanent trestle.

[0013] By adopting the above technical scheme, a fixing clamp is set on the pier of the permanent trestle, and a fixing ring 2 is set on the side wall of the fixing clamp close to the anchor beam. After the connecting rope is passed through the side of the hanging net away from the anchor beam to fix the hanging net, the connecting rope is fixed to the fixing ring 2, and the side of the hanging net away from the anchor beam is fixed, and the hanging net is fixed to the side wall of the pier of the permanent trestle to block the river channel and prevent the hanging net from detaching from the top.

[0014] Optionally, a connecting plate is provided in the base trench, and the connecting plate is arranged along the length direction of the base trench. The upper side of the connecting plate close to the anchor beam is in contact with the side wall of the anchor beam. A connecting rod inserted in the river channel is provided at the bottom of the connecting plate, and side plates corresponding to the inclined groove are provided on both sides of the connecting plate.

[0015] By adopting the above technical solution, a connecting plate is set in the foundation trench, and the connecting plate is fixed by driving the connecting rod at the bottom of the connecting plate into the bottom of the foundation trench. The bottom of the foundation trench is further leveled by fitting the top of the connecting plate with the anchor beam to prevent aquatic organisms from passing through the gap. The side plates integrally formed on the side walls of the connecting plate support the inclined grooves on both sides of the foundation trench, thereby reducing the possibility of collapse of the foundation trench when placing the anchor beam.

[0016] Optionally, a connecting frame is provided on the side wall of the pier of the permanent trestle near the anchor beam, the connecting frame is connected to the side of the fixing clamp near the anchor beam, a fixing piece is provided on the connecting frame near the hanging net, and the fixing piece is connected to the mesh surface of the hanging net.

[0017] By adopting the above technical solution, the connecting frame is fixed on the side of the pier close to the anchor beam, and the mesh surface of the hanging net fixed between the fixing clamp of the pier and the anchor beam is fixed by the fixing parts arranged on the connecting frame, so that the mesh surface of the hanging net close to the side wall of the pier is connected to the fixing parts, thereby reducing the possibility of aquatic organisms passing through the gaps generated when the mesh surface of the hanging net moves with the flow of water, and reducing the possibility of breakage between the connection positions on both sides of the hanging net and the fixing ring and the connecting rope due to long-term friction.

[0018] Optionally, a Bailey beam is provided on the side of the cap beam of the permanent pier away from the temporary pier, one end of the gantry is in contact with the Bailey beam, and the other end of the gantry is in contact with the temporary pier, and a hoist for hoisting the anchor beam is provided on the gantry, and the hoist corresponds to the fixing ring provided on the anchor beam.

[0019] By adopting the above technical solution, a gantry is set on the Bailey beam of the permanent trestle and the temporary trestle, the fixed ring 1 of the anchor beam is connected by a movable hoisting device set on the gantry, the anchor beam is hoisted, and the anchor beam is hoisted and lowered into the foundation groove, thereby improving the installation efficiency of the anchor beam.

[0020] Optionally, guide rails are provided on the Bailey beam and the temporary trestle, rotating wheels corresponding to the guide rails are rotatably provided at both ends of the gantry, driving members for driving the rotating wheels are provided at both ends of the gantry, and the driving members drive the rotating wheels to drive the gantry to move on the trestle, thereby setting the anchor beam along the length direction of the trestle.

[0021] By adopting the above technical scheme, guide rails are set on the Bailey beam and the temporary trestle, and the driving members arranged at both ends of the gantry drive the rotating wheels at both ends of the gantry to rotate on the guide rails, thereby driving the gantry to move on the trestle, so that the gantry can install the anchor beam along the length direction of the trestle, thereby improving the installation efficiency of the anchor beam. Through the movement of the gantry, the anchor beam can be staggered from the corbel supports on both sides of the cap beam during the lowering process, so as to prevent the anchor beam from colliding with the corbel supports as much as possible.

[0022] A construction method for excavating and leveling underwater foundation trenches in offshore areas and installing anchor beams and hanging nets, comprising the following steps: A foundation trench is opened at the side wall of the pier of the permanent trestle in the river channel, and inclined trenches are opened on both sides of the foundation trench, so that both sides of the underwater foundation trench are set with inclined surfaces, and the bottom of the underwater foundation trench is set flat; Start the gantry, use the gantry to hoist the anchor beams down into the foundation trench, and set the anchor beams along the length of the foundation trench so that the ends of adjacent anchor beams fit together to avoid large gaps between adjacent anchor beams, thus reducing the possibility of aquatic organisms passing through when the anchor beams are staggered; The hanging net is then fixed to the fixing assembly of the pier side wall, and the bottom of the hanging net is connected to the anchor beam; thereby the hanging net is fixed in the river channel below the permanent trestle and arranged along the length direction of the permanent trestle.

[0023] Optionally, the installation of anchor beams and hanging nets includes the following steps: After the foundation trench is excavated, the connecting plate is placed in the foundation trench, the connecting plate is driven downward, the connecting plate is fixed in the foundation trench, the foundation trench is kept flat by the connecting plate, and the connecting plate is arranged along the length direction of the foundation trench to keep the connecting plates as flat as possible; The lifting device under the gantry is connected to a fixed ring on the raised block on the anchor beam, and the anchor beam is lifted and lowered into the base groove opened in the river channel, and fits with the fixed connecting plate in the base groove. Then the driving parts at both ends of the gantry drive the gantry to move on the trestle, and the anchor beam is arranged along the length direction of the base groove so that the ends of adjacent anchor beams are butted against each other; After the anchor beam is lowered, one side of the hanging net is connected to the connecting rope passed through the fixing ring 2 on the fixing clamp set on the pier of the permanent trestle, the other side of the hanging net is connected to the fixing ring 1 on the anchor beam, and the mesh surface of the hanging net is connected to the fixing parts on the connecting frame on the side wall of the pier to fix the hanging net and reduce the possibility of the hanging net moving with the water flow and leaking aquatic organisms.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Open the foundation trench along the length direction of the permanent trestle, so that the fixed anchor beam in the foundation trench is horizontally set at the bottom of the river channel, so that the hanging net can block the river channel; open inclined grooves on both sides of the foundation trench so that the anchor beam can better fall into the foundation trench through the inclined grooves, and make the bottom of the foundation trench flat so that the bottom of the anchor beam fits with the side wall of the bottom of the foundation trench, reducing the gap between the bottom of the anchor beam and the foundation trench, and making the end side walls of adjacent anchor beams abut against each other, reducing the gap between adjacent anchor beams, and reducing the possibility of aquatic organisms bypassing the hanging net through the gap; 2. Set the fixing clamp on the pier of the permanent trestle, set the second fixing ring on the side wall of the fixing clamp close to the anchor beam, pass the connecting rope through the side of the hanging net away from the anchor beam to fix the hanging net, then fix the connecting rope on the second fixing ring, fix the side of the hanging net away from the anchor beam, and fix the hanging net on the side wall of the pier of the permanent trestle to block the river channel and prevent the hanging net from detaching from the top; 3. A connecting plate is set in the foundation trench, and the connecting rod at the bottom of the connecting plate is driven into the bottom of the foundation trench to fix the connecting plate. The top of the connecting plate is fitted with the anchor beam to further level the bottom of the foundation trench to prevent aquatic organisms from passing through the gap. The side plates integrally formed on the side walls of the connecting plate support the inclined grooves on both sides of the foundation trench to reduce the possibility of collapse of the foundation trench when placing the anchor beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of an underwater foundation trench and anchor beam installation net hanging structure in offshore areas.

[0026] Figure 2 yes Figure 1 A partial enlarged view of middle A.

[0027] Figure 3 It is a partial cross-sectional view of the underwater foundation trench and anchor beam installation and net hanging construction.

[0028] Figure 4 yes Figure 3 A partial enlarged view of B.

[0029] In the figure, 1. permanent trestle; 11. pier; 12. cap beam; 13. Bailey beam; 14. guide rail; 2. fixing assembly; 21. fixing clamp; 211. fixing ring 2; 212. connecting rope; 22. connecting frame; 221. fixing piece; 3. hanging net; 4. base groove; 41. inclined groove; 42. connecting plate; 421. connecting rod; 422. side plate; 5. anchor beam; 51. protrusion; 52. fixing ring 1; 6. temporary trestle; 7. door frame; 71. sling; 72. rotating wheel; 73. driving piece. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0031] Embodiment 1 A kind of offshore underwater foundation trench and anchor beam installation net hanging structure, refer to Figure 1 and Figure 2 , including a permanent trestle 1 set in a river channel, digging a foundation trench 4 at the bottom of the river channel with a dredger, so that the foundation trench 4 is set on one side of the pier 11 of the permanent trestle 1 along the length direction of the permanent trestle 1 until it extends to the river bank, so that the bottom of the foundation trench 4 remains flat, and inclined grooves 41 are excavated on both side walls of the foundation trench 4 to facilitate the placement of the anchor beam 5; a connecting plate 42 is set in the foundation trench 4, and a metal connecting rod 421 at the bottom of the connecting plate 42 is inserted into the bottom side wall of the foundation trench 4, and the metal connecting plate 42 is arranged along the length direction of the foundation trench 4, and the bottom of the foundation trench 4 is kept flat by the connecting plate 42. The metal side plates 422 extending on both sides of the connecting plate 42 block the side walls of the inclined groove 41 to prevent the foundation trench 4 from collapsing during the installation of the anchor beam 5. The anchor beam 5 is placed in the foundation trench 4. The anchor beam 5 is made of reinforced concrete. The bottom of the anchor beam 5 is fitted with the connecting plate 42 arranged in the foundation trench 4, so that the ends of adjacent anchor beams 5 are abutted against each other, thereby minimizing the gap between the anchor beams 5 to prevent aquatic organisms from passing through.

[0032] Reference Figure 3 and Figure 4 , a metal fixing clamp 21 is arranged around the outer wall of the pier 11, so that the fixing clamp 21 is connected to the pre-buried bolts on the pier 11, a metal fixing ring 211 is welded on the side of the fixing clamp 21 close to the anchor beam 5, a connecting rope 212 is passed through the fixing ring 211 of the fixing clamp 21 on the pier 11, and the connecting rope 212 is passed through the hanging net 3, and the hanging net 3 is arranged along the length direction of the permanent trestle 1, a metal connecting frame 22 is welded on the side close to the anchor beam 5 below the fixing clamp 21 on the same pier 11, and a fixing piece 221 is welded on the connecting rod 421, and a fixing piece 221 is welded on the connecting rod 421, The fixing piece 221 is a metal hook, which is connected to the mesh surface of the hanging net 3 close to the pier 11, fixes the hanging net 3, and reduces the possibility of the hanging net 3 moving with the flow of water; a concrete protrusion 51 integrally formed with the anchor beam 5 is provided above the anchor beam 5, and a metal fixing ring 52 connected to the steel bars in the anchor beam 5 is pre-buried above the protrusion 51, which is connected to the side of the hanging net 3 located in the river channel through the fixing ring 52, pulls the hanging net 3 down and fixes it, makes the bottom of the hanging net 3 contact with the side wall of the anchor beam 5, minimizes the gap between the hanging net 3 and the anchor beam 5, and reduces the possibility of aquatic organisms bypassing the hanging net 3.

[0033] Reference Figures 1 to 3A temporary steel trestle 6 is set up in the river channel along the length direction of the permanent trestle 1, a Bailey beam 13 is installed on the side of the cap beam 12 of the permanent trestle 1 away from the temporary trestle 6, so that the two ends of the large door frame 7 step on the Bailey beam 13 and the temporary trestle 6, and a metal guide rail 14 is welded on the Bailey beam 13 and the temporary trestle 6. The two ends of the door frame 7 rotate the rotating wheels 72 corresponding to the guide rail 14 through bearings and rotating shafts, and the driving parts 73 are fixed to the two ends of the door frame 7 with bolts. The moving part 73 is a large electric motor connected to a power source, which drives the rotating wheel 72 to rotate, thereby driving the gantry 7 to move on the pier. A sling 71 connected to the cable on the winch on the gantry 7 is installed on the gantry 7. The hook connected to the sling 71 is connected to the fixing ring 52 on the anchor beam 5. The anchor beam 5 is lifted and lowered into the base groove 4 through the gantry 7. The driving part 73 drives the gantry 7 to move the anchor beam 5 down along the length direction of the pier into the base groove 4, so that the ends of adjacent anchor beams 5 are butted against each other.

[0034] Embodiment 2 S100, a foundation trench 4 is opened at the side wall position of the pier 11 of the permanent trestle 1 in the river channel, and inclined grooves 41 are opened on both sides of the foundation trench 4, so that both sides of the underwater foundation trench 4 are inclined, and the bottom of the underwater foundation trench 4 is flat; S110, after the excavation of the foundation trench 4 is completed, the connecting plate 42 is placed in the foundation trench 4, the connecting plate 42 is driven downward, the connecting plate 42 is fixed in the foundation trench 4, the foundation trench 4 is kept flat by the connecting plate 42, and the connecting plate 42 is arranged along the length direction of the foundation trench 4 so that the connecting plates 42 are kept as flat as possible; S200, start the portal frame 7, use the portal frame 7 to lift the anchor beam 5 and lower it into the base trench 4, and arrange the anchor beam 5 along the length direction of the base trench 4 so that the ends of adjacent anchor beams 5 fit together, avoid large gaps between adjacent anchor beams 5, and reduce the possibility of aquatic organisms passing through after the anchor beams 5 are staggered; S210, the lifting device 71 under the gantry 7 is connected to the fixing ring 52 on the raised block on the anchor beam 5, and the anchor beam 5 is lifted and lowered into the base groove 4 opened in the river channel, and fits with the fixed connecting plate 42 in the base groove 4, and then the driving members 73 at both ends of the gantry 7 drive the gantry 7 to move on the trestle, and the anchor beams 5 are arranged along the length direction of the base groove 4, so that the ends of adjacent anchor beams 5 are abutted against each other; S300, then fix the hanging net 3 on the fixing assembly 2 of the side wall of the pier 11, and connect the bottom of the hanging net 3 to the anchor beam 5; thereby fixing the hanging net 3 in the river channel below the permanent trestle 1 and arranged along the length direction of the permanent trestle 1; S310, after the anchor beam 5 is lowered, one side of the hanging net 3 is connected to the connecting rope 212 passed through the fixing ring 211 on the fixing clamp 21 provided on the pier 11 of the permanent pier 1, the other side of the hanging net 3 is connected to the fixing ring 1 52 on the anchor beam 5, and the mesh surface of the hanging net 3 is connected to the fixing part 221 on the connecting frame 22 on the side wall of the pier 11, so as to fix the hanging net 3 and reduce the possibility of the hanging net 3 moving with the water flow and leaking aquatic organisms.

[0035] The implementation principle of the embodiment of the present application is: The foundation trench 4 on one side of the pier 11 of the permanent trestle 1 is excavated by a dredger, so that the foundation trench 4 is arranged along the length direction of the permanent trestle 1, and the inclined grooves 41 on both sides of the foundation trench 4 are excavated and formed so that the bottom of the foundation trench 4 is kept as flat as possible, and then the connecting plate 42 is fixed to the bottom of the foundation trench 4 by the connecting rod 421, and the connecting plate 42 is arranged along the length direction of the foundation trench 4, so that the side plates 422 on both sides of the connecting plate 42 fix the side walls of the inclined groove 41 to prevent the collapse of the foundation trench 4; the gantry 7 arranged on the permanent trestle 1 and the temporary trestle 6 drives the rotating wheel 72 to rotate on the guide rail 14 through the driving member 73, thereby driving the gantry 7 to move on the trestle, and the anchor beam 5 is hoisted by the gantry 7, and the anchor beam 5 is placed in the foundation trench 4, so that the anchor beam 5 is arranged at the bottom of the foundation trench 4 opened underwater The connecting plates 42 are fitted together, so that the ends of adjacent anchor beams 5 in the base groove 4 are abutted against each other, and the gap between adjacent anchor beams 5 is minimized to prevent aquatic organisms from passing through; a fixing clamp 21 is fixed on the pier 11, and a connecting rope 212 is passed through the fixing ring 211 on the fixing clamp 21, one side of the hanging net 3 is connected to the connecting rope 212, the hanging net 3 is pulled downward, and the lower side of the hanging net 3 is connected to the fixing ring 1 52 on the anchor beam 5, so that part of the lower side of the hanging net 3 is in contact with the side wall of the anchor beam 5 by the hanging net 3, and the hanging net 3 is fixed. Part of the net surface of the hanging net 3 is connected to the fixing piece 221 on the connecting frame 22 of the side wall of the pier 11, and the net surface of the hanging net 3 is fixed, so that the hanging net 3 is arranged along the length direction of the permanent trestle 1 to block the aquatic organisms in the river channel. The anchor beam 5 is installed through the underwater foundation groove 4 to fix the hanging net 3, so as to minimize the movement of the hanging net 3 along with the flow of water and reduce the possibility of aquatic organisms passing through the hanging net 3 through the gaps in the moving hanging net 3.

[0036] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An offshore underwater foundation trench and anchor beam installation net hanging structure, including a permanent trestle (1) arranged on a river channel, characterized in that: A fixing assembly (2) is arranged on the pier (11) of the permanent trestle (1), and the fixing assembly (2) is connected to a hanging net (3). A base trench (4) is opened on the riverbed at the bottom of the pier (11) of the permanent trestle (1), and an anchor beam (5) is arranged in the base trench (4). The anchor beam (5) is connected to a side of the hanging net (3) away from the fixing assembly (2). A temporary trestle (6) is arranged on one side of the permanent trestle (1), and a portal frame (7) is arranged on the permanent trestle (1) and the temporary trestle (6), and the portal frame (7) suspends the anchor beam (5) in the base trench (4).

2. The offshore underwater trench and anchor beam installation and net hanging structure according to claim 1, characterized in that: The base trench (4) is arranged along the length direction of the permanent trestle (1), and inclined grooves (41) are provided on both side walls of the base trench (4). The bottom side walls of the base trench (4) are arranged flat, and the anchor beams (5) are arranged in the base trench (4) along the length direction of the base trench (4) and abut against the side walls of the base trench (4). The side walls between adjacent anchor beams (5) are fitted together, and the side of the anchor beam (5) away from the base trench (4) is connected to the hanging net (3).

3. The offshore underwater trench and anchor beam installation and net hanging structure according to claim 2, characterized in that: A protrusion (51) is extended from one side of the anchor beam (5) away from the base groove (4), the upper part of the protrusion (51) corresponds to the fixing assembly (2), and the ends of the protrusions (51) on adjacent anchor beams (5) are fitted together. A fixing ring (52) is provided on the side of the protrusion (51) away from the anchor beam (5), and the fixing ring (52) is connected to one side of the hanging net (3), so that the hanging net (3) is arranged in the river channel along the length direction of the base groove (4).

4. The offshore underwater foundation trench and anchor beam installation and net hanging structure according to claim 3, characterized in that: The fixing assembly (2) comprises a fixing clamp (21), the fixing clamp (21) being arranged on the outer side wall of the pier (11) of the fixed trestle, the fixing clamp (21) being arranged with a fixing ring 2 (211) on the side wall close to the anchor beam (5), the fixing ring 2 (211) being arranged with a connecting rope (212) between adjacent piers (11) in the length direction of the permanent trestle (1), the connecting rope (212) being connected to a side of the hanging net (3) away from the anchor beam (5), so as to arrange the hanging net (3) along the length direction of the permanent trestle (1).

5. The offshore underwater foundation trench and anchor beam installation and net hanging structure according to claim 2, characterized in that: A connecting plate (42) is provided in the base trench (4), and the connecting plate (42) is provided along the length direction of the base trench (4). The upper side of the connecting plate (42) close to the anchor beam (5) is in contact with the side wall of the anchor beam (5). A connecting rod (421) inserted in the river channel is provided at the bottom of the connecting plate (42), and side plates (422) corresponding to the inclined groove (41) are provided on both sides of the connecting plate (42).

6. The offshore underwater foundation trench and anchor beam installation and net hanging structure according to claim 4, characterized in that: A connecting frame (22) is provided on the side wall of the pier (11) of the permanent trestle (1) close to the anchor beam (5); the connecting frame (22) is connected to the side of the fixing clamp (21) close to the anchor beam (5); a fixing piece (221) is provided on the connecting frame (22) close to the hanging net (3); the fixing piece (221) is connected to the mesh surface of the hanging net (3).

7. The offshore underwater foundation trench and anchor beam installation and net hanging structure according to claim 1, characterized in that: A Bailey beam (13) is provided on the side of the cap beam (12) of the permanent pier (1) away from the temporary pier (6), one end of the portal frame (7) is in contact with the Bailey beam (13), and the other end of the portal frame (7) is in contact with the temporary pier (6), and a hoist (71) for hoisting the anchor beam (5) is provided on the portal frame (7), and the hoist (71) corresponds to the fixing ring (52) provided on the anchor beam (5).

8. The offshore underwater trench and anchor beam installation and net hanging structure according to claim 7, characterized in that: Guide rails (14) are arranged on the Bailey beam (13) and the temporary trestle (6); rotating wheels (72) corresponding to the guide rails (14) are rotatably arranged at both ends of the gantry (7); driving members (73) for driving the rotating wheels (72) are arranged at both ends of the gantry (7); the driving member (73) drives the rotating wheels (72) to drive the gantry (7) to move on the trestle, so that the anchor beam (5) is arranged along the length direction of the trestle.

9. A method for excavating and leveling underwater foundation trenches and installing anchor beams and hanging nets in offshore areas, characterized in that: It comprises an offshore underwater foundation trench and anchor beam installation net hanging structure as described in any one of claims 1 to 8, S100, a foundation trench (4) is opened at the side wall position of the pier (11) of the permanent trestle (1) in the river channel, and inclined grooves (41) are opened on both sides of the foundation trench (4), so that both sides of the underwater foundation trench (4) are arranged in an inclined surface, and the bottom of the underwater foundation trench (4) is arranged flat; S200, start the portal frame (7), use the portal frame (7) to lift the anchor beam (5) and lower it into the base trench (4), and arrange the anchor beam (5) along the length direction of the base trench (4) so ​​that the ends of adjacent anchor beams (5) fit together, avoid large gaps between adjacent anchor beams (5), and reduce the possibility of aquatic organisms passing through after the anchor beams (5) are staggered; S300, then fix the hanging net (3) on the fixing assembly (2) of the side wall of the pier (11), and connect the bottom of the hanging net (3) to the anchor beam (5); thereby fixing the hanging net (3) in the river channel below the permanent pier (1) and arranged along the length direction of the permanent pier (1).

10. The method for excavating and leveling underwater foundation trenches and installing anchor beams and hanging nets in offshore areas according to claim 9, characterized in that: S110, after the excavation of the foundation trench (4) is completed, the connecting plate (42) is placed in the foundation trench (4), the connecting plate (42) is driven downward, the connecting plate (42) is fixed in the foundation trench (4), the foundation trench (4) is kept flat by the connecting plate (42), and the connecting plate (42) is arranged along the length direction of the foundation trench (4) so ​​that the connecting plates (42) are kept as flat as possible; S210, the lifting device (71) below the portal frame (7) is connected to a fixing ring (52) on a raised block on the anchor beam (5), and the anchor beam (5) is lifted and lowered into a base groove (4) opened in the river channel, and fits with a fixed connecting plate (42) in the base groove (4), and then the driving members (73) at both ends of the portal frame (7) drive the portal frame (7) to move on the trestle, and the anchor beam (5) is arranged along the length direction of the base groove (4) so ​​that the ends of adjacent anchor beams (5) are butted against each other; S310, after the anchor beam (5) is lowered, one side of the hanging net (3) is connected to a connecting rope (212) passed through a fixing ring 2 (211) on a fixing clamp (21) provided on a pier (11) of the permanent pier (1), the other side of the hanging net (3) is connected to a fixing ring 1 (52) on the anchor beam (5), the mesh surface of the hanging net (3) is connected to a fixing piece (221) on a connecting frame (22) on the side wall of the pier (11), and the hanging net (3) is fixed to reduce the possibility of the hanging net (3) moving with the water flow and leaking aquatic organisms.

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